16 results about "Constant current" patented technology

A switching constant-current power device can stabilize current flowing to a load (e.g. a display device comprising an LED, or the like) even when the current is repeatedly interrupted. A voltage current detector is connected to the output side of a power converter and creates a voltage signal in accordance with the output voltage thereof; and a feedback circuit is provided between a controller for driving the power converter and a current detector, which generates a first feedback signal in accordance with the load current. The feedback circuit comprises a signal holding unit, which outputs a second feedback signal that was created by consulting the voltage signal at a given time, the feedback circuit supplying the first feedback signal, output by the current detector, to the controller when load current is flowing, and supplying the second feedback signal, output by the signal holding unit, to the controller when load current is not flowing.

The invention provides a battery pack charging method, wherein a battery pack comprises a plurality of battery monomers or modules. The battery pack charging method comprises the following steps of: carrying out constant-current charging on the battery pack; and carrying out monomer voltage closed loop feedback charging on the battery pack. According to the battery charging method provided by the invention, on the condition of high safety, the battery pack is most rapidly charged.

An output circuit comprises first and second transistors, a driving circuit and a current mirror circuit. The driving circuit supplies a relatively small constant current to the base of the first transistor. When a current flows to the collector of the first transistor, a current with a magnitude set at a fixed ratio with respect to the current flows to the collector of the second transistor, and a current proportional to the current flowing to the collector of the second transistor flows to the base of the first transistor by way of the current mirror circuit. That is, a current, which is determined in accordance with a current flowing to the collector of the first transistor, flows to the base of the first transistor.

The invention discloses a mass flowmeter detecting device and a mass flowmeter detecting method. The mass flowmeter detecting device comprises a fluid storage pool, a constant-current constant-pressure pump, a fluid gathering bag and a fluid storage pool return pipe, wherein the constant-current constant-pressure pump is mounted between the fluid storage pool and the liquid inlet end of the flowmeter to be detected; the fluid gathering bag and the fluid storage pool return pipe are mounted at the liquid outlet end of the flowmeter to be detected in parallel, the liquid inlet end of the fluid gathering bag is provided with a first switch electromagnetic valve, and the liquid inlet end of the fluid storage pool return pipe is provided with a second switch electromagnetic valve. The mass flowmeter detecting method is simple and reasonable in steps; the fluid switch and the timing starting and stopping are synchronously controlled by a computer through a software module, so that the fluid mass sampling and the sampling time are synchronized rigidly and correspondingly; and moreover, the mass flowmeter detecting method is simple and effective and is capable of avoiding the problem that the fluid mass loss error and the indication error and timing error due to the fluid flow state fluctuation enable the standard flow rate value to have large error.

The invention relates to a novel LED (light emitting diode) lighting driving power supply, wherein the input end of the driving power supply is connected with the output end of the driving power supply via a feedback circuit; the feedback circuit comprises a voltage control loop, a current control loop and a PWM (pulse width modulation) regulating circuit; the feedback signals of the voltage control loop and the current control loop are input to the PWM regulating circuit by an optical coupler; the PWM regulating circuit is connected with a transformer circuit so as to control the output voltage; and in the current control loop, a triode is adopted to be matched with a sampling resistor so as to regulate the input duty ratio of the PWM chip, thereby regulating the output current and keeping constant current. The driving power supply combines the triode, a constant voltage source and the optical coupler to control a load end and the PWM controller of the whole circuit so as to output the constant current and constant voltage, thereby driving the LED. The novel LED lighting driving power supply needs few required apparatuses and is high in reliability.

The invention discloses a method for detecting an inner connecting resistor of a power battery pack. The method includes the following steps that (1) the alternating current inner resistance Zi of each battery cell is tested before battery modules are assembled; (2) the alternating current inner resistance Zm of each battery module is tested after the battery modules are assembled and before the battery pack is assembled, and the inner connecting resistor comprehensive value Rci of each battery module is calculated through the Zi and the Zm; (3) constant-current discharge is conducted on the power battery pack, the direct current resistance Di of each battery module and the direct current resistance Dp of the battery pack are calculated, and the connecting resistor comprehensive value Rco between the modules is calculated through the Di and the Dp; (4) the inner connecting resistor comprehensive value Rc of the battery pack is calculated through the formula Rc=Rci+Rco; (5) the inner connecting resistor of the power battery pack is evaluated through the Rc. According to the method for detecting the inner connecting resistor of the power battery pack, the structure of the battery pack does not need to be damaged, the Rc can be calculated effectively and conveniently, and therefore support is provided for the connecting resistor design of the battery pack and the electrical property and health condition judgment.

The invention discloses a battery device. The battery device comprises: a semiconductor thermoelectric generation module; a boosting constant current module, wherein the input end of the boosting constant current module is connected with the output end of the semiconductor thermoelectric generation module; and a battery module connected with the output end of the boosting constant current module. The invention also discloses a wearable apparatus with the battery device. The battery device can improve the battery life of the wearable apparatus.

The invention relates to a circuit for realizing constant current control in a primary control switch power converter. The circuit comprises a controller, wherein the controller comprises a sampling/holding circuit, a voltage/current conversion circuit, an oscillator circuit, a flip-flop and a current limiting comparator; the sampling/holding circuit samples and holds feedback voltage VFB and inputs the feedback voltage VFB to the voltage/current conversion circuit; the voltage/current conversion circuit converts the feedback voltage VFB to obtain required control current; the oscillator circuit outputs a corresponding oscillation frequency signal according to the control current, and inputs the oscillation frequency signal to a setting end of the flip-flop; when the oscillation frequency signal is at a high level, an output ends of the flip-flop outputs a high level signal to switch on a driving power tube; and when sampling voltage VCS is higher than reference voltage VREF of an antiphase end of the current limiting comparator, the current limiting comparator outputs a current limiting signal to allow the flip-flop to output a low level so as to switch off the power tube. The circuit is compact in structure, wide in application scope, safe and reliable, and can realize the constant current control.

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 relates to a car lamp manufacturing process. The car lamp manufacturing process comprises the following steps that CNC machining is adopted, lamp holder and reflection cup decoration piece materials are ABS or PC panels, and lamp shade materials are PMMA panels; a lampshade silicone mould is adopted for manufacturing a lamp holder; vacuum casting is carried out, and the lamp holder and reflection cup decoration piece materials are PU resin Hei-cast8150; the lamp shade materials are PU resin AXSON-PX521HT; a multi-angle light source module is manufactured, a constant current drive circuit board capable of driving the multi-angle light source module to work is manufactured, a connection-out line is arranged at the front end of the constant current drive circuit board, a connection-in line is arranged at the tail end of the constant current drive circuit board, and the position, between a reflection cup and the constant current drive circuit board, of the outline position of the periphery of a lampshade are at least partially welded; and the multi-angle light source module is arranged in the lampshade. The car lamp manufacturing process is simple in operation and low in cost.

The invention provides a power battery detection method, device and equipment. The method comprises the steps that a power battery is controlled to be charged with a first constant current to a first preset electric quantity at a preset environment temperature; the power battery is controlled to execute at least one discharge cycle process, and each discharge cycle process comprises the steps of standing for a first preset time, continuously discharging to a second preset electric quantity with a second constant current in sequence, and discharging for an nth duration with an Nth preset power An in sequence after standing for a second preset time; and acquiring the voltage value of the power battery from the first duration to the nth duration in each discharge cycle process. According to the power battery detection method provided by the embodiment of the invention, the test time is greatly saved, and the test development cost is reduced. 5 to 10s pulse power is introduced, so that the short-time acceleration performance of the whole vehicle during urban driving is improved, the experience feeling of a user is improved, and the problem of whole vehicle fault caused by inaccurate pulse power spectrum in the whole vehicle acceleration process is prevented.

The fast constant-current test method for the electrochemical performance of magnesium-base anode includes the following steps: preparing test sample and anode test electrolyte reagent; setting them inside cathode test crucible; connecting to the test circuit to test the closed circuit potential of the test sample in the test period; measuring the open-circuit potential of the test sample after test; reporting and calculating the total electric capacity via the loop during test period based on the formula; reporting and calculating the practical electric capacity obtained corresponding to unit mass loss of the test sample based on the formula; and comparing and analyzing to obtain determined electrochemical performance parameter. The test method is fast, accurate and efficient.