41 results about "Rectifier" patented technology

The invention relates to a modular multilevel converter (MMC)-based transformer-free four-quadrant high-voltage variable frequency power supply topological structure. A rectifier module and an inverter module have a modular multilevel structure and are formed by a plurality of subunits connected in series. The input side of the topological rectifier module is directly connected with a network-side high voltage through a charging circuit; the rectifier module converts a high-voltage alternating current (AC) voltage into a direct current (DC) voltage and inputs the DC voltage into the inverter module, and the inverter module converts the DC voltage into the AC voltage; and various states of a power system are simulated, and the topological structure has a four-quadrant type and can feed energy back. The topological structure has the advantages of removing the high-voltage transformer at the power input end, lowering cost, reducing volume and weight of a high-voltage variable frequency power supply, reducing consumption of components, and improving work efficiency, has a simple unit structure, and is convenient to wire and easy to disassemble and assemble.

The invention discloses an analog circuit for detecting the wire breaking of a displacement sensor LVDT, which comprises a displacement sensor LVDT, wherein a primary coil of the displacement sensor LVDT is connected with an excitation signal source. The analog circuit for detecting the wire breaking of the displacement sensor LVDT is characterized in that the output ends of the secondary coils of the displacement sensor LVDT are respectively connected with a test signal and are respectively connected with a multi-channel selection switch through a filter and rectifier circuit, and predetermined different groups and combinations of wire breaking voltages which are output when an LVDT is disconnected are simultaneously connected with the multi-channel selection switch; the two output end voltages of the secondary coils of the LVDT are respectively combined with a group of comparison voltages to be connected with each comparator, and each comparator is connected with the output control end of the multi-channel selection switch through an arithmetic logic OR unit, and the multi-channel selection switch is simultaneously connected with a servo amplifier. The invention can directly achieve the detection of wire breaking state only by a hardware circuit, and the method is simple and reliable.

Asynchronous rectifier controller is provided on a secondary side of an insulation-type synchronous DC/DC converter and controls the synchronous rectifier transistor. A driver circuit controls the synchronous rectifier transistor. A photo coupler connection terminal is coupled to an input side of the photo coupler. An error amplifier amplifies an error between a voltage detection signal according to an output voltage of the DC/DC converter and its target voltage, and to draw a current according to the error from an input side of the photo coupler via the photo coupler connection terminal.

The invention discloses a harmonic reactive power compensation device as well as a control method thereof. The device comprises a bypass cabinet, an input transformer, a control device and a power cabinet, the input transformer adopts three-phase input, poly-phase winding output and the zigzag connection means, the power cabinet comprises 3N identical power units, input terminals of R, S and T at a rectifier side of each power unit are connected at output sides of the transformer, so each power unit has an independent direct current power supply, and the power units are mutually insulated and secondary windings of the transformer are also mutually insulated; wherein, N power units form one phase by means of cascade connection, all the power units are in star connection or in triangle connection with three phases correspondingly and then are connected with a power network by a reactor. The invention has advantages of high reliability, flexible control, realizable harmonic reactive power continuous compensation, fast response speed, high net side power factors and low total current harmonic wave.

The invention relates to a traction converter and control, fault processing and carrier phase shifting methods thereof. The traction converter comprises a first pre-charging loop and a second pre-charging loop that are connected with a secondary-side winding of the traction transformer respectively, a first four-quadrant rectifier module connected in series with the first pre-charging loop, a second four-quadrant rectifier module connected in series with the second pre-charging loop, an intermediate direct-current voltage loop with the input terminal connected with the output terminal of the first four-quadrant rectifier module and the output terminal of the second four-quadrant rectifier module, a first traction inverter module with the input terminal connected with the output terminal ofthe intermediate direct-current voltage loop, a second traction inverter module with the input terminal connected with the output terminal of the intermediate direct-current voltage loop, and an auxiliary inversion system with the input terminal connected with the output terminal of the intermediate direct-current voltage loop. According to the traction converter, the single four-quadrant rectifier module can work and the single traction inverter module can work; and the robustness is high, the fault rate is low, the size is reduced, and the cost is lowered.

Disclosed is an electrostatic discharge (ESD) protection circuit. The ESD protection circuit may include a silicon controller rectifier (SCR) which may be triggered via at least one of its first trigger gate or second trigger gate. The ESD protection circuit may further include a highly doped region coupled to either the anode or cathode of the SCR, wherein the highly doped region may provide additional carriers to facilitate triggering of the SCR during an ESD event, whereby the SCR may be triggered more quickly.

The invention discloses a rectifier circuit for piezoelectric energy collectors to solve the problem that the energy consumption of an existing circuit is high and the efficiency of a piezoelectric energy collector is low when the rectifier voltage of the piezoelectric energy collector is greater than 2.5 V. The rectifier circuit comprises a full-wave rectifier bridge (2) and an active diode circuit (4), and further comprises a bias circuit (3). The output end of the full-wave rectifier bridge (2) is connected with the input ends of the active diode circuit (4) and the bias circuit (3). The output end of the bias circuit (3) is connected with the bias voltage end of a comparator in the active diode circuit (4). The output end of the active diode circuit (4) is connected with an energy storage capacitor C3. The rectifier circuit for piezoelectric energy collectors has the advantages of being low in power consumption, high in energy conversion efficiency, and capable of ensuring the energy demand of wireless sensor network node load.

The invention provides a silicon-controlled rectifier and a manufacturing method. The silicon-controlled rectifier comprises a semiconductor substrate; a first N trap, a P trap and a second N trap which are generated in the semiconductor substrate and sequentially and adjacently arranged; a first high-concentration P-type doping and a first high-concentration N-type doping which are located at theupper part of the first N trap; a second high-concentration N-type doping and a second high-concentration P-type doping which are located at the upper part of the second N trap; and a third high-concentration P-type doping which is positioned at the upper part of the P trap. The first high-concentration P-type doping and the first high-concentration N-type doping are connected to form a first device electrode; and the second high-concentration N-type doping and the second high-concentration P-type doping are connected to form a second device electrode. According to the designed and manufactured silicon-controlled rectifier, the structural characteristics of the device are symmetrically distributed, a PNPN channel can be formed when the high-voltage input and output end of positive high voltage or the high-voltage input and output end ofnegative high voltage are connected on first device pole (or the second device pole) without the conduction condition in any direction, and the bidirectional anti-static protection function of the positive high voltage and the negative high voltage can be achieved while circuit application is implemented.

A motor vehicle drive system (1) comprises: a first electric drive machine (3), connected to a battery of accumulator cells, capable of providing mechanical drive energy and arranged in such a way that it can be coupled, in a way that may or may not be disengageable, to a differential (2) capable of driving a pair of driven wheels of the vehicle, - a second electric drive machine (4), connected to the battery of accumulator cells by a current inverter - rectifier which alternately allows the second machine (4) to deliver mechanical drive energy from the electrical energy of the battery and to convert mechanical energy transmitted to the second drive machine into electrical energy sent to the battery, - a combustion engine (5). The system further comprises a first set of gears (22-53, 38-53) provided with a first sliding sleeve (44,49), which, by moving the first sliding sleeve (44, 49), allows the second electric machine (4) to be coupled selectively either to the differential (2) or to the combustion engine (5).

The invention provides an LED (Light-Emitting Diode) unit and a constant-flow unit voltage-stabilizing LED control circuit. The constant-flow unit voltage-stabilizing LED control circuit comprises a rectifier bridge, at least one LED control unit series branch and at least one current limiting resistor, wherein the rectifier bridge is connected with a power supply, and the LED control unit series branch is connected with the rectifier bridge. The constant-flow unit voltage-stabilizing LED control circuit utilizes the forward voltage drop characteristic of a voltage stabilizing tube and a diode, the voltage-stabilizing role of the full unit is played. The control mode is cheaper and more practical, and the efficiency is higher. In addition, when the voltage of the power supply is lower than the normal power supply voltage, as the full circuit works in a working state lower than a voltage stabilizing value, the lower voltage is uniformly shared by the voltage-stabilizing circuits of the full unit, the brightness of all LEDs is uniformly reduced, and therefore the continuous dimming function can be realized in a certain voltage range. Practices prove that the full circuit can reliably work in the voltage range of AC (Alternating Current)/DC (Direct Current) 120V to 270 V.

The invention relates to a drive circuit of an agricultural tree fluorescent lamp with emergency power supply. The technical problem to be solved is that the provided drive circuit of the agricultural tree fluorescent lamp with the emergency power supply is simple in structure, capable of providing stable current for the fluorescent lamp and also capable of limiting the current within a relatively small range. The drive circuit of the agricultural tree fluorescent lamp with the emergency power supply comprises a rectifier-filter circuit, a step-down circuit, a light source circuit, a current-limiting circuit and an emergency circuit; the drive circuit is suitable for the field of agricultural trees.

The invention provides a storage battery high-efficiency formation incentive charge device which belongs to the technical field of electron. The invention solves the problems that the formation efficiency is low, the environmental pollution is caused easily, and the like. when the storage battery is produced currently. The storage battery high-efficiency formation incentive charge device is used for urging electrolyte in the storage battery; the device comprises a power amplifier circuit which is used for producing plus-minus pulse current and a power supply; a power amplifier driving circuit which is used for driving the power amplifier circuit to produce the plus-minus pulse current is connected between the power amplifier circuit and the anode of the power supply; the power amplifier circuit is connected with a rectifier circuit which is used for adjusting the width and the scope of the plus-minus pulse current produced by driving the power amplifier circuit; the output end of the rectifier circuit is connected with the storage battery. Through a charge container formation after the high frequency plus-minus pulse current is produced to pour the electrolyte into the storage battery assembled by a green plate, the device prolongs the service life of the storage battery, increases the storage battery capacity produced primarily and at the same time reduces the pollution emission.

The invention discloses an integratable power supply filtering circuit, which comprises a rectification circuit, N levels of pulsating direct current electric charge shifting and voltage merging rectification circuits and N levels of electronic filtering circuits, wherein the rectification circuit consists of a bridge type rectifier DW1; the N levels of pulsating direct current electric charge shifting and voltage merging rectification circuits comprise at least N levels of pulsating direct current electric charge shifting unit circuits and at least N+1 levels of voltage merging rectificationunit circuits; each level of pulsating direct current electric charge shifting unit circuit consists of a resistor, a capacitor and a transistor; each level of voltage merging rectification unit circuit consists of a diode and a transistor; and the N levels of electronic filtering circuits comprise at least one unit electronic filtering circuit, wherein each unit electronic filtering circuit consists of two audions, seven resistors, one capacitor and an operational amplifier.

The existing charger has many components, such that the circuit is complicated. The invention provides a simple and practical charger with a simple structure in order to solve the shortcomings in the above background technology. The charger with the simple structure comprises a power supply; a capacitor, a rectifier diode D1 and a battery are sequentially connected in series onto the power supply; a rectifier diode D2 is connected in parallel between the power supply and the capacitor; and an overcharge protection module is connected in parallel onto the battery. According to the charger, the structure is simple, the circuit is a capacitor current limiting-type constant charging circuit, the magnitude of the charging current is determined by the current limiting capacitor C, and the magnitude of the charging current stays unchanged whether the charger is used for charging a single battery or charging a plurality of batteries in series.

The invention discloses a three-stage synchronous motor rotor position estimation method based on a direct decoupling mode. A main exciter of a three-stage synchronous motor uses single-phase alternating current excitation with constant frequency, and a second harmonic wave generated by a rotating rectifier as a high-frequency signal is indirectly injected into an excitation winding of a main generator, a second-order generalized integrator is used for extracting a high-frequency response signal and an orthogonal signal thereof from current loop output controlled by starting of the main generator, high-frequency sine and cosine signals extracted from a stator side of a main exciter are combined, a decoupling signal synchronous with the high-frequency response signal is generated through analytical operation, a heterodyne method is combined for modulation, and a rotor position angle of the three-stage synchronous motor is estimated. According to the rotor position estimation method provided by the invention, the decoupling signal synchronous with the high-frequency response signal can be accurately generated, the calculation amount is small, implementation is easy, the complexity of a motor control algorithm can be effectively reduced, and the accuracy of the obtained position estimation angle is relatively high.

The invention discloses a lasting alarm switch circuit. The switch circuit is a touch switch circuit formed by setting a human body leakage circuit, diodes VD1-VD4 form a bridge rectifier, DC voltage output by the bridge rectifier is divided through a resistor R1 and a resistor R2, and a capacitor C1 performs filtering for supplying power to a triode VT. The alarm switch circuit has self-locking function, and can continuously give an alarm until a power source is shut off once the circuit is triggered; the lasting alarm switch circuit is convenient, simple and quick, and has a strong alarm function and high practical value.

The invention discloses an LED drive device with stable performance. The LED drive device comprises an input protection circuit, a step-down circuit, a rectifier and filter circuit and a voltage-dividing and current-limiting resistor, which are electrically connected, wherein the voltage-dividing and current-limiting resistor is used for carrying out current limiting on an LED light source circuit and carrying out current limiting protection on an LED, so that the LED works under the drive of stable voltage and current; and the service lifetime of the LED is ensured. A filter capacitor in the rectifier and filter circuit is a tantalum electrolytic capacitor; and the filter capacitor is relatively small in volume and stable in performance under the conditions of the same withstand voltage and electric capacity, can still keep good electrical performance after long-time working and can prolong the service lifetime of an LED drive circuit. A discharge chip resistor is arranged in the filter capacitor; and after a power supply is cut off, the chip resistor can discharge the electricity stored in a capacitor core within a short period of time, and reduces the voltage of the capacitor core to zero, so that bleeder resistors do not need to be connected with two ends of the filter capacitor in parallel; and the circuit for driving the power supply is relatively simple.

The invention provides a frequency converter soft start system and method and a frequency conversion air-conditioner applied therewith. The frequency converter soft start system comprises a three-phase bridge-type full-wave rectifier circuit, of which the upper bridge arm is a three-phase bridge-type half-wave controllable circuit; a zero point detection circuit which is connected with the voltage input end of the three-phase bridge-type full-wave rectifier circuit and is used for outputting a zero point signal of the input voltage of the three-phase bridge-type full-wave rectifier circuit; a sampling circuit which is connected with the output end of the three-phase bridge-type full-wave rectifier circuit and is used for detecting the output voltage of the three-phase bridge-type full-wave rectifier circuit and outputting sampling signals; an operation circuit which is connected with the zero point detection circuit and the sampling circuit and is used for outputting phase shift signals through a shift signal output end according to the sampling signals and the zero point signal; and a drive circuit which is connected with the shift signal output end and is provided with a drive signal output end used for outputting drive signals obtained according to the shift signals, wherein the drive signal output end is connected with the control end of the upper bridge arm of the three-phase bridge-type full-wave rectifier circuit. According to the frequency converter soft start system and method and the frequency conversion air-conditioner applied therewith, the impact on the load of a frequency converter can be prevented.

The invention discloses a voltage-stabilized and filtered power source for a single-chip microcomputer. The power source comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first diode, a second diode, a field effect transistor, a transistor, a controllable precision voltage stabilized source, a transformer and a rectifier bridge. According to the voltage-stabilized and filtered power source for the single-chip microcomputer of the invention, the rectifier bridge is adopted to carry out AC-DC conversion; the first capacitor is adopted to realize filtering; the diode, the second capacitor and the third capacitor are adopted to realize voltage multiplication; thethird resistor and the fourth resistor are adopted to realize voltage division; and the resistance value of the fourth resistor can be adjusted, so that the adjustment of an output voltage can be realized, and therefore, the output voltage can be flexibly controlled according to the use condition of the single-chip microcomputer.

The invention relates to the field of electromagnetic heating and particularly relates to an electromagnetic heating controller. The electromagnetic heating controller comprises a rectifier module, a filter unit, an inverter unit and an oscillation amplifying unit sequentially in electrical connection. The electromagnetic heating controller also comprises a control circuit module; the control circuit module comprises a sensing detection circuit unit, a CPU controller, an output driving unit, a phase-locked phase shift unit and an interface control unit; the CPU controller is respectively electrically connected with the sensing detection circuit unit, the output driving unit, the phase-locked phase shift unit and the interface control unit; the sensing detection circuit unit is respectively electrically connected with the rectifier module, the filter unit, the inverter unit, the oscillation amplifying unit and the phase-locked phase shift unit; the inverter unit is electrically connected with the output driving unit; and the interface control unit is electrically connected with an external control signal module. The electromagnetic heating controller uses the current mutual inverter system AC-DC-AC hardware structure, and has the advantages of high electrothermal conversion efficiency, long service life and good stability.