5results about How to "Reduce output current" patented technology

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.

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 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.