24 results about "Switching power" patented technology

The invention belongs to the technical field of analogue integrated circuits and particularly relates to an error amplifier used for a switching power supply. According to the error amplifier, a circuit structure of turning-back output under-voltage protection is additionally arranged in a high-voltage clamping circuit; based on a feedback principle, the output range of the error amplifier is limited through a simulation method, and therefore a system is more stable; the situation that for a traditional structure, a long-time adjusting process is needed is avoided, and the functions of output short circuit protection and power-on stable starting are achieved. The error amplifier is especially suitable for the switching power supply.

The invention provides a switching power supply device capable of ensuring the transient recovery of the voltage discharge of an electrolytic capacitor after the rectifying process, without the addition of power consumption. The switching power supply device comprises a rectifying circuit used for rectifying the AC voltage; an electrolytic capacitor used for rectifying and smoothing the AC voltage; a transformer used for applying a smoothed voltage onto the electrolytic capacitor; a switching element connected to the transformer (T); and a control circuit (Z1) used for enabling the switching on/off of the switching element. The control circuit (Z1) is composed of a start-up circuit (Z10) and a discharge circuit (Z14). The start-up circuit (Z10) is used for supplying the voltage of the electrolytic capacitor to the Vcc terminal of the control circuit (Z1). The discharge circuit (Z14) is connected with the Vcc terminal and is used for discharging the transient recovery voltage of the electrolytic capacitor.

The invention discloses a design method of flyback switching power supply transformer shield windings. The design method comprises the steps of (1) selecting a transformer, determining a connection type of the transformer shield windings, and measuring a structural dimension of the transformer, (2) setting turns of the shield windings as fixed values, and obtaining structural capacitance between the windings of the transformer under the different turns of the shield windings by utilizing simulation software, (3) calculating a common mode current equivalence coefficient in the transformer underthe different turns of the shield windings, and drawing a function relation characteristic curve of the common mode current equivalence coefficient and the turns of the shield windings, and (4) obtaining the turns of the shield windings when the common mode current equivalence coefficient is minimum according to the drawn characteristic curve, namely the optimal turns of the shield windings for inhibiting common mode current of the transformer. Compared with the existing common mode inhibition technique, the method has the advantages of simple device manufacturing, low realization cost, overall device weight and volume reduction, obvious inhibition effect and the like.

The invention discloses an advertisement charging pile. The advertisement charging pile is characterized in that the advertisement charging pile comprises a charging pile body fixed on the ground; theinterior of the charging pile body is equipped with a PCB mainboard power management module; the upper end of the charging pile body is provided with an oblique plane, on which an advertisement module is arranged; the advertisement module is a liquid crystal display screen; the liquid crystal display screen is connected with the power management module through a data management module; the liquidcrystal display screen is used for touch-control operation and serves as a play carrier for advertisement media content; the power management module is connected with a switch power module; the switch power module is composed of a driving circuit and an AC-DC switching circuit; current of a power supply connected with the power management module is converted from 110V-220V alternating current todirect current; the power management module is connected with a network module composed of a WIFI module, a GPS location module and a 3G module, a storage hard disk and a local area network; the localarea network is connected with a background server; and then, advertisements are pushed through the background server; and a two-dimensional code payment interface of Wechat or Alipay is displayed through the liquid crystal display screen.

This invention discloses one BUCK drive circuit, which comprises the following parts: commuter tube to output switch power voltage from input end to voltage output end; commuter charge circuit to charge the commuter tube in control of PWM switch signals to make the BUCK drive circuit in commuter work status; the commuter discharge circuit is to make the drive circuit at back flow work status in discharge in control of PWM switch signals.

The invention discloses an improved structure of a switch power supply of an industrial control computer in the technical field of industrial control and power supplies. The improved device comprises a power supply base shell. A power supply housing is arranged on the outer wall of the power supply base shell. A printed circuit board is arranged on the outer wall of the power supply base shell. An alternating current input port is arranged in the top of the power supply base shell, and is electrically connected with the printed circuit board. A direct current output port is arranged in the bottom of the power supply base shell and is electrically connected with the printed circuit board. A high frequency transformer is arranged on the left side of the printed circuit board. A heat radiator is arranged at the bottom of the high frequency transformer. In this way, a problem of waveform distortion of input current is solved, a problem is solved that higher harmonic waves generated by a switch power supply of the current industrial control computer will generate conducted interference and radiated interference along a power transmission line of the industrial control computer and normal operation of electrical appliances of a power supply system circuit is ensured.

The invention discloses a battery equalization device. The battery equalization device comprises a series battery pack, a power electronic switch array, a voltage and current sensor, an isolating type switching power supply, an external power supply switcher and an equalization controller. The equalization controller controls power electronic switches to connect batteries in the battery pack to an equalization charge circuit in turn, detects the states of the batteries and controls the isolating type switching power supply to charge the batteries with low voltage independently. The battery equalization device improves the measurement accuracy of each battery in the battery pack by adopting the bi-directional power electronic switches, constructs a low-impedance current path and reduces waste of energy resources. The battery equalization device can play a role when the battery pack is charged or discharged or left unused.

The invention discloses an LED lamp constant-power constant-current time division multiplexing control method. The control method comprises a switch power supply, N paths of LED drivers, and LED lampsof N kinds of colors; the LED lamp of each color correspondingly provides a lamplight color; the LED lamp constant-power constant-current time division multiplexing control method comprises the implementation steps of determining the color types Y of the LED lamps which need to be driven to be lightened up; determining the total output current peak I<1> and the total output power P<1> of the LEDlamps of the Y kinds of colors in the step S1; improving the total output current peak I<2> of the LED lamps of the Y kinds of colors in the step S<2>, wherein at the current moment, the output current peak of the LED lamp of each color is I<2>/Y, and the output power of the LED lamp of each color is (X*P<1>)/Y; controlling the PWM duty ratio of the LED lamp of each color in the step S3 to be 1/Y;and enabling the conduction time of the LED lamp of each color in the step 4 to be staggered. By virtue of the control method, a beneficial effect that the power of the LED lamps in different color modes in mixed use can be constant and close to the total output power and the constant current is achieved.

The invention discloses an ultra-low ripple switching power supply with a protection mechanism. The other end of a first telescopic rod is connected with the top of a steel block, the outer side of the steel block is hinged to the top of a second telescopic rod, the bottom of the second telescopic rod is hinged to the top of an inner housing, a power supply body is arranged on the inner side of the inner housing, the inner side of an outer housing is connected with the outer side of the inner housing through a first spring, heat dissipating fins are equidistantly arranged on the top of the power supply body, a fan port is formed in one side of the inner housing, and a fan is arranged in the fan port. The inner housing is lifted and pulled by the power supply through the first telescopic rod and the second telescopic rod, so that the inner housing is suspended in the air, shock absorbing of a horizontal plane is conducted on the inner housing through the first spring, the shock-absorbing protection effect of the power supply body is better, by the arrangement of the outer housing and the inner housing, better protection on the power supply body can be achieved by the inner and outerhousings, and the bumping and damaging of the power supply body are effectively prevented.

The invention discloses an air conditioner, a control circuit of the air conditioner and a control method of the air conditioner. The control circuit of the air conditioner comprises a master control circuit, a power output module and a phase and magnitude regulation circuit, wherein the master control circuit is used for receiving working signals of a load and detecting the output voltage of the load, and the phase and magnitude regulation circuit is connected between the master control circuit and the power output module and used for regulating the output voltage of the load according to the working signals of the load received by the master control circuit so as to make the power output module provide a working voltage for the load according to the regulated output voltage of the load. Through the control circuit of the air conditioner, the working voltage of the load can be changed by regulating the output voltage of the load when the working state of the load changes, a switching power supply does not need to output high voltage in real time, and thus power consumption of the air conditioner is reduced.

The invention discloses a protection circuit of a switch power supply. The protection circuit comprises a rectification diode D, a switch K, a relay J, a resistor R1, a resistor R2, a resistor R3, a capacitor C1, and a capacitor C2, a port a and a port b of the rectification diode D are respectively connected with alternating current power supply terminals Uia and Uib, a port c of the rectification diode D is connected with a voltage output terminal Uoutb, a port d of the rectification diode D is connected with one terminal of the resistor R1, the other terminal of the resistor R1 is connected with a voltage output terminal Uouta and one terminal of the resistor R2, the other terminal of the resistor R2 is connected with one terminal of the relay J and one terminal of the resistor R3, the other terminal of the relay J and the other terminal of the resistor R3 are both connected with the port c of the rectification diode D, the resistor R3 is connected with the capacitor C1 in parallel, the resistor R1 is connected with the switch K in parallel, and the capacitor C2 is connected between the voltage output terminals Uouta and Uoutb. According to the protection circuit, high surge current generated during power-up of the switch power supply can be reduced to an allowed range, the damage to the switch power supply by the high surge current can be avoided, and the service lifetime of the switch power supply is extended.

The invention discloses a transformer. The transformer comprises a circuit board, two first magnetic core bodies and at least one second magnetic core body, wherein the circuit board has two opposite surfaces; the at least one second magnetic core body is embedded into the circuit board along the thickness direction of the circuit board; the two first magnetic core bodies are respectively fixed on the two opposite surfaces; the at least one second magnetic core body is positioned between two first magnetic core bodies; and the two first magnetic core bodies and the at least one second magnetic core body form a magnetic core of the transformer. The invention also provides a switch power supply.

In order to verify and obtain the interaction law of electrified parallel conductors through visual experiments, the invention provides an electrified parallel wire frame interaction demonstration instrument. The demonstration instrument mainly comprises a slide rheostat, an ampere meter, a back plate, a binding belt, a clamping groove, a guide rail, a lamp panel, a wire frame, a cross rod, an insulating block, a power supply negative binding post, a switch, a power supply positive binding post, supporting legs, a push-pull force meter, a U-shaped frame, supports, a bottom plate and the like;the bottom plate is supported by four supporting legs, the middle of the bottom plate is hollow and is connected by two supports, a battery box is installed below each of the two ends of the bottom plate, two power supply binding posts of each battery box penetrate through the bottom plate and are fixed to the bottom plate, a first back plate and a second back plate are symmetrically fixed to thecentral axes of the two ends of the bottom plate and are perpendicular to the bottom plate, and the indication direction of the lamp panel and the position change of the electrified wire frame can beobserved. The interaction rule of the electrified parallel conductors is obtained, and the teaching effect is good.

The invention relates to a vehicle boost switching power supply with high reliability and long life. The vehicle boost switching power supply comprises a power supply input network, a power supply output network and a control loop, wherein the power supply input network comprises a vehicle-mounted storage battery, a power tube and a primary coil of a transformer, the power supply output network comprises a secondary coil of the transformer, a follow current circuit, a rectification circuit and a filtering and energy storage network, and the control loop comprises a voltage sampling network, a signal conversion circuit and a master control circuit which are sequentially connected. The invention can be used for solving the technical problem that the existing vehicle switching power supply has low reliability while cost is high, reliability of a power supply is improved, cost is reduced, working life is prolonged, and volume of the power supply is reduced.

The invention relates to a new technical process for refining through lead electrolysis without copper tubes of wet lead electrolysis, which is energy-saving, high efficient and environmental friendly. The method has main characteristics that firstly, traditional rectification power supply which is cumbersome is cancelled, high frequency switching power supply which is made of nanometer material is adopted, energy is saved by 20%-30%, secondly, the copper tubes are not used to conduct electricity, and thirdly, the flow direction of electrolyte is changed. A positive electrode 1 of the power supply enters a positive plate 3 to react with the electrolyte through a hanger 2 on the first positive plate, is transformed into lead ions 4, flows to an emission surface 5 whose right side is clung with a cathode plate of a second positive plate, and is reduced to pure metal lead. Current flow also flows to the emission surface of a third positive plate through the back 6 of the second positive plate. The positive electrode of the power supply forms a return circuit with a negative electrode 8 of the power supply through continuously transmitting to a last cathode plate 7, the electrolyte 9 flows into a liquid inlet tube 10 from an elevated tank, respectively flows through a distribute tube 11, flows to an inlet on the bottom of an overflow flat groove 12, then, ascends to flow into a distribute tube 13, enters an underground tank through a liquid return pipe 14, and hoists to the elevated tank through a pump, wherein exhaust gas, waste slag and wastewater are not discharged in electrolysis.

The invention is suitable for the technical field of switching power supplies, and particularly relates to an alternating current-direct current conversion circuit and a power conversion device. The alternating current-direct current conversion circuit comprises a transformer, a primary side conversion circuit and a secondary side synchronous rectification circuit, and the primary side conversion circuit comprises a primary side switching tube, a primary side driving circuit, a starting control circuit and a voltage detection output circuit; pre-driving is carried out when a primary side is started, namely, a PWM control signal with a small duty ratio is output to control a primary side switching tube to be switched on and switched off, so that an MOSFET of a secondary side synchronous rectification circuit is ensured to control a primary side control circuit to control a primary side driving circuit to work again after the follow current of a parasitic body diode is attenuated to zero; therefore, the problem that the stress of the secondary side MOSFET is too high due to the reverse recovery current of the diode of the secondary side MOSFET is solved, and the driving reliability is improved.

The invention belongs to the field of engine performance testing equipment, and discloses a system for controlling the oil quantity of an alcohol consumption instrument. The system comprises a measuring fuel cup, a methanol fuel pump, a weighing sensor, a switching power supply, a switching power supply controller, a first methanol pressure sensor, a second methanol pressure sensor, a safety valve, an overflow pipe and an overflow cup, wherein the measuring fuel cup is provided with a fuel inlet and a fuel outlet. The weighing sensor is installed on the measuring fuel cup. The input end of theswitching power supply is connected with a storage battery, and the output end of the switching power supply is connected to the methanol fuel pump. The overflow pipe and the first methanol pressuresensor are installed on a main pipe. The switching power supply controller is connected with the first methanol pressure sensor, the second methanol pressure sensor and the switching power supply. Thesystem can achieve the adjustment-only function of the fuel quantity of the alcohol consumption instrument, and facilitates the test of an engine under various conditions. Meanwhile, the methanol fuel pump in alcohol consumption instrument does not operate at a full load manner, thereby saving the energy.

The invention discloses an automatic feeding system of a rotary evaporator. The automatic feeding system of the rotary evaporator is characterized by comprising breakers (2), a switch power source (3), a first electromagnetic valve (4), a first liquid level switch (5), a second liquid level switch (6), a first normally open contact (7), a first relay coil (8), a second electromagnetic valve (9), a third liquid level switch (10), a fourth liquid level switch (11), a second normally open contact (12), a second relay coil (13), a rotary switch (14) and a normally closed contact (15). The automatic feeding system is capable of automatically feeding solution to be evaporated and releasing evaporated solvent, feeding and releasing process is effectively controlled, and time and labor cost are saved.

The invention discloses an intelligent switching power supply applied to a medical place, which relates to the technical field of switching power supplies and comprises a power supply bottom plate, a fixed shell fixedly mounted at the top of the power supply bottom plate and a circuit board, the top of the power supply bottom plate is provided with a circuit winding and unwinding part used for bending and storing a circuit and a pulling control part used for adjusting the extension length of the circuit, the circuit board is provided with a power line, the power line and the circuit winding and unwinding part are installed in a matched mode, and the power line is in contact with the pulling control part. And the circuit winding and unwinding part is connected with the pulling control part through a connecting unit used for connecting and driving a circuit to be wound and unwound. The medical equipment is reasonable in structure, the medical equipment can be directly connected with the switching power supply for use, people do not need to additionally prepare lines for wiring extension of the switching power supply, the switching power supply is safer and more stable in use, the medical equipment is more convenient to use, and the medical process is smoother.

The invention discloses a switching power supply control system of multiple voltage levels, and relates to electronic technology. The system comprises a first level voltage adjusting module, a second level voltage adjusting module, a low-voltage control module and a high-voltage control module, wherein the first level voltage adjusting module comprises a feedback circuit consisting of a depletionmetal oxide semiconductor field effect transistor (MOSFET) device and an operational amplifier, and the source of the depletion MOSFET device is the output end of the first level voltage adjusting module; and a level conversion circuit is connected in series between the low-voltage control module and the high-voltage control module, and the level conversion circuit is also connected with the output end of the first level voltage adjusting module and the output end of the second level voltage adjusting module. The system can provide higher driving voltage at the same time of ensuring the control precision and broaden the model selection range of an external power device.