14results about How to "Reduce output current" patented technology

The invention discloses a BUCK converter over-current protection circuit based on ripple V2COT control. The BUCK converter over-current protection circuit comprises a current sampling circuit, a comparator and a frequency reduction circuit which are connected in sequence. The current sampling circuit generates a sampling voltage, the current sampling circuit further comprises a reference voltage generating circuit which outputs a reference voltage and inputs the voltage and the reference voltage into a comparator for comparison to obtain an overcurrent signal, and the overcurrent signal is input into the frequency reduction circuit to generate a frequency reduction signal. Through combinational logic of a gate circuit, a frequency reduction signal is output. The ripple injection circuit is connected to the grid electrode of the MOS tube, and the output waveform of the ripple injection circuit is adjusted by controlling the on and off of the MOS tube, so that the working frequency of the system is reduced. The problem that the circuit recovery time is long after the overcurrent is eliminated is solved, the faster the circuit recovery is, the smaller the risk of element damage is, the higher the system reliability is correspondingly, and the development requirements of high reliability and safety of contemporary electronic products are met.

The invention discloses a method for designing a long-distance laser battery assembly array for space, which comprises the following steps of: arranging an annular laser battery array on a plane where a hybrid laser battery array is located, and filling laser battery monomers with different sizes in the annular laser battery array to complete the layout of the hybrid laser battery array; a substrate used for pasting the hybrid laser battery array is designed, the substrate comprises a heat dissipation substrate and a PCB substrate which are oppositely connected, and the heat dissipation substrate is provided with an air-cooled or water-cooled heat dissipation structure; according to the designed hybrid laser battery array layout, trace point punching sites are arranged on a heat dissipation substrate and a PCB substrate, circuit series-parallel connection design is conducted on the back face of the PCB substrate, and a battery electrode lead penetrates through the back face of the substrate to be welded; selecting a protective cover plate and pasting the protective cover plate on the front surface of the laser battery monomer; and then the laser battery monomers are attached to the heat dissipation substrate. Through the series-parallel connection optimization design of the laser battery assembly, the series-parallel connection loss is reduced, the heat accumulation of the assembly is reduced, and the efficiency of laser energy compensation is improved.

Embodiments of the present application disclose a UPS device protection method. The protection method comprises: acquiring a first bus voltage applied to a main inverter circuit; in response to the first bus voltage being less than or equal to a first voltage threshold, reducing an output current of the main inverter circuit; acquiring a second bus voltage applied to the main inverter circuit after current-limiting operation of the main inverter circuit; and in response to the second bus voltage being greater than or equal to a second voltage threshold, controlling the output current of the main inverter circuit to return to a normal current, the second voltage threshold being greater than the first voltage threshold. In the case of rapid drop of the first bus voltage of the UPS device, the embodiments of the present application can quickly limit the output current of the main inverter circuit to gradually increase the bus voltage applied to the main inverter circuit, reduce the voltage difference between the bus voltage and the battery voltage of the battery, avoid damage to the switching tube of the direct current conversion circuit, the power factor correction circuit or the main inverter circuit due to the large current, and further improve the working reliability and safety of the UPS device.

The present invention discloses a power supply circuit for a computing device, including a main circuit, a control circuit and a plurality of computing boards as loads, wherein the main circuit includes a load midpoint voltage clamping circuit, and the plurality of computing boards are divided into two groups of equal number, and the two groups of computing boards are connected in series to form a load circuit; the positive terminal of the load circuit is connected to the positive voltage output port of the load midpoint voltage clamping circuit, and the negative terminal of the load circuit is connected to the negative voltage output port of the load midpoint voltage clamping circuit; the connection point between the two groups of computing boards of the load circuit is connected to the midpoint voltage output port of the load midpoint voltage clamping circuit as the load midpoint. The present invention can meet the power supply of the control board of the cloud computing device by connecting two groups of computing boards in series. When the output power is the same, by increasing the output voltage and reducing the output current, the efficiency of the device can be improved, and the energy saving effect and stability of the device can be improved.

This invention discloses a relay-charge parallel envelope tracking power supply with multiplexed input sources, comprising: a stepped wave voltage generation circuit, an AB-class linear amplifier, a feedforward control circuit, and a pulse edge distribution unit. It improves upon conventional parallel envelope tracking power supplies by using a relay-charge switched-capacitor converter to generate a stepped wave voltage based on the modulated wave voltage output from the feedforward control circuit. By integrating a level providing unit and a level gating unit, it simultaneously reduces the switching frequency relative to the reference signal frequency l / k, thereby reducing switching losses. This facilitates further reducing the switching frequency while maintaining tracking bandwidth, simplifying the circuit structure. Multiplexing the input source of the stepped wave voltage generation circuit reduces linear amplifier losses and input power, further improving the overall circuit efficiency.

The invention discloses a power management method and system for an intelligent electric hinge. The method comprises the steps that primary temperature control is conducted on a circuit board and a power storage module of a door leaf receiving end; the door frame transmitting end adopts a full-bridge LLC resonant inverter circuit and drives a transmitting coil at specified high frequency, and after the door leaf receiving end receives electric energy, a synchronous rectification circuit is adopted for rectification to obtain initial voltage; the power management module carries out constant current-constant voltage equalizing charging on the battery pack in the power storage module, and carries out secondary temperature control on the receiving end circuit board according to a temperature threshold value; and a DC-DC unit in the power management module is utilized to convert the initial voltage or the power supply voltage of the power storage module according to the request of the multi-path function module and the control instruction of the power management module, and multi-path output voltage is obtained respectively. Smooth operation of each functional module is guaranteed, and power consumption in the electric energy conversion process is effectively reduced.

The application relates to a circuit and method for improving the refresh rate of an LED display screen. The circuit for improving the refresh rate of the LED display screen comprises a data processing module and a PWM control unit, wherein the analog constant current source module is used for reducing the current according to the required refresh rate, and the PWM control unit is used for transforming the PWM grayscale data to reduce the PWM period. The method for improving the refresh rate of the LED display screen is as follows: reducing the current according to the required refresh rate, and then proportionally adjusting the PWM grayscale data according to the required PWM period. By reducing the output current of the analog constant current source, the grayscale value is proportionally reduced under the same current equivalent value, and the display period of the PWM can be reduced, so that the refresh rate of the LED display screen can be improved under the premise of fixed scanning number.

The utility model relates to the technical field of electronic circuits, in particular to an over-temperature protection circuit, which is characterized by comprising a rectifying circuit, a filter circuit, a chip U1, a metal oxide semiconductor (MOS) tube Q1 driving control network, an intensifier circuit and an adjusting circuit. Wherein the rectifying circuit is used for converting input alternating current into direct current; the filter circuit is used for removing electromagnetic interference in the direct current converted by the rectifying circuit; the chip U1 is used for driving the on and off of the MOS tube Q1; the MOS tube Q1 drives the control network and is used for controlling energy storage and discharge of the energy storage inductor T1; the enhancement circuit is used for enhancing the driving capability of the MOS tube Q1; and the adjusting circuit is used for controlling the output power and temperature of the driving power supply. According to the over-temperature protection circuit provided by the utility model, temperature protection points can be conveniently set by adjusting parameters of components, and the reliability of the components is improved.

The embodiment of the invention provides a constant-current charging system and a linear charging chip. The constant-current charging system comprises a charging circuit, a clamping module, a constant-current control module, a temperature control module and a reference voltage adjusting module, and the charging circuit provides charging current for a battery through a first transistor by using input voltage; the clamping module converts the first current and / or the second current into a control voltage, clamps the control voltage to a first reference voltage during charging, and outputs a control electrode voltage of the first transistor; the constant current control module is used for outputting a first current according to a feedback signal representing the charging current and a second reference voltage; the temperature control module is used for outputting a second current according to the junction temperature indication signal and a third reference voltage; and the reference voltage adjusting module is configured to adjust the voltage value of the second reference voltage according to the second current. The problems that in the prior art, when the junction temperature rises, the charging current cannot be decreased in time, the chip further heats, and safe work of the chip is affected are solved.

The present invention provides a current control circuit, including a linear constant current circuit and an output voltage sampling module, wherein the linear constant current circuit includes a constant current driving module and active components and a control module respectively connected thereto, the control module controls the first reference voltage of the constant current driving module, and uses the constant current driving module to control the working state of the active components. The constant current driving module provides a constant current for the LED load; the output voltage sampling module is configured to sample the output voltage of the linear constant current circuit, and provide the sampled output voltage to the control module. If the lowest output voltage value of the output voltage provided to the control module within a preset period is less than a set value, the control module controls the first reference voltage of the constant current driving module to decrease, and the output current of the linear constant current circuit to decrease until the sampled lowest output voltage value of the linear constant current circuit is greater than the set value. This solution can solve the contradiction between the linear constant current flicker and the loss of the linear constant current circuit.

The invention discloses an inverter control method, system and device, a storage medium and computer equipment. The method is applied to an interleaved multi-level inverter with a plurality of phase voltage output circuits, and comprises the following steps: determining a voltage target vector of a voltage to be output by the interleaved multi-level inverter, and determining a voltage phase vector sequence corresponding to each phase voltage output circuit based on the voltage target vector; based on the level type of the vector level in the voltage phase vector sequence, determining whether various redundant level states exist in the output state of the phase voltage output circuit within the vector action time corresponding to the vector level; and when the phase voltage output circuit has multiple redundant level states within the vector action time, current output of each parallel bridge arm in the phase voltage output circuit is controlled, so that the output state of the phase voltage output circuit is a target state in the multiple redundant level states. According to the scheme, the efficiency of selecting the redundant level state of the interleaved multi-level inverter can be improved.

The present invention relates to the technical field of brake-by-wire control of electric vehicles, and specifically to a motor protection method and system for an electronic mechanical brake system. The solution of the present application determines the state of the motor by acquiring the state parameters of the motor. When it is determined that the motor is in a degraded state, the degraded state value of the degraded state is calculated according to the state parameters, and then the corresponding compensation coefficient is determined according to the degraded state value. The current limit value of the motor is corrected by the compensation coefficient, and finally, the target current limit value sent by the motor main controller is limited within the corrected current limit value to reduce the output current of the motor. By adopting the above-mentioned technical solution of the present application, overheating and demagnetization caused by excessive use of the motor can be effectively prevented, and the damage to the motor caused by special working conditions during operation can be reduced, thereby avoiding the failure of the service brake function.

The invention provides an LED driving device, a microcontroller and a control method of an LED module. The LED driving device comprises a power supply module, a switch module and a control module. The power supply module is used for supplying power to the LED module, wherein the power supply module determines whether to trigger an overcurrent protection function of the power supply module according to whether the output current exceeds a threshold current. The control module is coupled to the power supply module and a switch module connected in series with the LED module, and is used for receiving the over-current detection signal and controlling the conduction state of the switch module based on the over-current detection signal so as to influence the magnitude of the current passing through the LED module. When the over-current detection signal indicates that the output current exceeds the threshold current, the control module outputs a first control signal based on the over-current detection signal to control the switch module, so that the over-current protection function is not triggered.

The utility model discloses an HID filament lamp compatible with an inductive ballast, which comprises a driving circuit and a filament lamp bulb light bar, and is characterized in that the driving circuit comprises an input protection unit for overcurrent protection and is connected with the inductive ballast; the pre-stage resistance-capacitance voltage reduction unit is connected with the inductive ballast and is used for receiving the output constant power of the inductive ballast and adjusting the output constant power to reduce the voltage and the current; the filtering unit is connected between the output end of the input protection unit and the input end of the pre-stage resistance-capacitance voltage reduction unit and is used for inhibiting electromagnetic interference; the rear-stage voltage doubling rectifying unit is connected with the output end of the input protection unit and the output end of the front-stage resistance-capacitance voltage reduction unit and used for boosting voltage so as to reduce front-stage energy efficiency loss, and a filament lamp bulb light bar is connected to the output end of the rear-stage voltage doubling rectifying unit; the output discharging unit is connected in parallel with the output end of the rear-stage voltage doubling rectifying unit and is used for balancing the discharging current; the utility model has the advantages of realizing perfect compatibility with North America inductance ballasts, improving the energy efficiency and reducing the cost.