Santak Electronic (shenzhen) Co., Ltd.

Hai Robotics Co., Ltd.

Eaton Intelligent Power Limited

Dawei Zheng

Hualiang Li

Dan Liu

Lei Cao

Huahong Ning

Cheng Luo

Han Li

Huafen Ouyang

Dengke Zhang

Dongxin Jin

Lingfu Ou

Huiting Xin

Pingchang Lin

Yunmei Wu

Tian Jing

Sui Ouyang

Dewu Kang

A stable control system for a three-phase rectification controller circuit is provided. The stable control system filters voltage harmonics and performs attenuation feedback compensation on current harmonics to enable a rectification circuit to achieve high stability and low THDi, while performing filtering on a direct current bus voltage in the case of an unbalanced load, so as to filter out voltage harmonics and enable the circuit to support the unbalanced load. A stable control system for an interleaved direct current booster circuit is also provided. The stable control system equalizes inter-leg currents such that a battery has good dynamic effects and good current equalization performance.

Stable control systems and methods employing one-way rectification and interleaved booster

The present invention provides a multiple input converter for outputting power from AC power or a battery to positive and negative DC buses. The multiple input converter includes at least one bridge arm unit and a bidirectional DC-DC conversion unit. The bridge arm unit corresponding to one phase of the AC power includes an upper bridge arm and a lower bridge arm that can independently form a two-level converter. In a battery mode, the upper and lower bridge arms discharge power from the rechargeable battery to the positive and negative DC buses, and the bidirectional DC-DC conversion unit discharges power from the rechargeable battery to the positive and negative DC buses or balances voltages of the positive and negative DC buses. In a mains mode, the bridge arm units are simultaneously connected to the AC power for rectifying and outputting the power to the positive and negative DC buses. The bidirectional DC-DC conversion unit is connected between the battery and the positive and negative DC buses to determine to perform charging or discharging according to load conditions. The power converter of the present invention reduces circuit elements and provides a variety of optimized power output modes, reducing costs.

Multiple input converter and an uninterruptible power supply including the same

A multi-input power converter includes three bridge arm units connected between a three-phase AC power supply and a positive/negative DC bus. First and second capacitors are connected in series between the positive and negative DC buses with a node connected to a neutral point. Each bridge arm unit includes an inductor and a bidirectional switch unit connected in series with a node connected to a current direction control bridge arm between the positive and negative DC buses. Second ends of bidirectional switch units are connected to the neutral point. In a battery mode, two of the bridge arm units are as battery mounting bridge arms to constitute a DC loop with a rechargeable battery to supply power to the positive and negative DC buses, and the remaining bridge arm unit enables an inductor thereon to alternately connect the positive and negative DC buses to balance a bus capacitance voltage.

Multi-input power converter and online uninterruptible power supply including multi-input power converter

The present invention provides a power factor correction circuit, a power factor correction assembly and an on-line uninterruptible power supply including the same. The power factor correction circuit comprises a pulse width modulated rectifier and an isolated DC-DC converter, wherein an output of the pulse width modulated rectifier is connected to an input of the isolated DC-DC converter. The power factor correction assembly comprises a plurality of power factor correction circuits described above, wherein inputs of pulse width modulated rectifiers in the plurality of power factor correction circuits are connected in series, and outputs of isolated DC-DC converters in the plurality of power factor correction circuits are connected in parallel. The power factor correction assembly of the present invention needs no line-frequency transformer and has the advantages of small size, low cost and improved operation reliability.

Power factor correction circuit, power factor correction assembly and on-line uninterruptible power supply comprising same

Transportation robot

Safety vest

The present invention provides a Miller clamping device for parallel switching transistors and a driver comprising the same. The Miller clamping device includes: a driver chip including an output terminal and a built-in Miller clamping circuit with a Miller clamping terminal, the output terminal of the driver chip being configured to output a pulse width modulation signal; and a plurality of auxiliary Miller clamping circuits, each of the auxiliary Miller clamping circuits being connected between a gate of a corresponding switching transistor and the Miller clamping terminal of the built-in Miller clamping circuit. When the built-in Miller clamping circuit is triggered for Miller clamping, a Miller current generated by the corresponding switching transistor flows to a first direct-current (DC) voltage through a corresponding auxiliary Miller clamping circuit. The Miller clamping device of the present invention can perform Miller clamping on the parallel switching transistors and reduce the circuit cost.

Miller clamping device for parallel switching transistors and driver comprising same

A control system for a three-phase inverter includes an instantaneous value voltage controller and an equivalent effective value voltage controller. The instantaneous value voltage controller is configured to feed back and control an instantaneous value of an inverter output voltage. The equivalenteffective value voltage controller is configured to perform an orthogonal decomposition feedback control on an effective value of the inverter output voltage. The equivalent effective value voltage controller is configured to perform integral compensation respectively on a real-axis voltage and an imaginary-axis voltage of a two-phase rotating coordinate system of the three-phase inverter. An output of the instantaneous valuevoltage controller and an output of the equivalent effective value voltage controller are used to obtain the inverter output voltage through a delay stage transfer function and a controlled object transfer function.

Three-phase inverter control system and three-phase inverter control method

The present invention provides a temperature protective device for a filter capacitor bank. The capacitor bank comprises two or more capacitors which are arranged in an array manner. The temperature protective device comprises a temperature measurement device which comprises: a cover body covering the capacitor bank; a single temperature sensor fixed at a center area of the cover body, which is used for measuring a temperature value of the capacitor bank; and a heat conduction pad located between the cover body and the capacitor bank, wherein the heat conduction pad and the cover body have fitted shapes. The temperature protective device of the present invention saves cost and can accurately realize temperature protection of the capacitor bank.

Temperature protective device for filter capacitor bank

The present invention provides a power factor correction circuit (), a power factor correction assembly () and an on-line uninterruptible power supply including the same. The power factor correction circuit () comprises a pulse width modulated rectifier () and an isolated DC-DC converter (), wherein an output of the pulse width modulated rectifier () is connected to an input of the isolated DC-DC converter (). The power factor correction assembly () comprises a plurality of power factor correction circuits () described above, wherein inputs of pulse width modulated rectifiers () in the plurality of power factor correction circuits () are connected in series, and outputs of isolated DC-DC converters () in the plurality of power factor correction circuits () are connected in parallel. The power factor correction assembly () of the present invention needs no line-frequency transformer and has the advantages of small size, low cost and improved operation reliability.

The present invention provides an apparatus to actively balance the thermal performance of paralleled power devices, comprising: a monitoring unit for monitoring the temperature of each power device of the paralleled power devices to judge whether the temperature is out of balance; and a balancing unit for adjusting power loss of the power devices with monitored higher temperatures so as to achieve the balance of the thermal performance of the paralleled power devices.

Apparatus and approach to actively balance thermal performance of paralleled devices

The utility model provides a tower UPS frame and a tower UPS. The tower UPS frame comprises: a power supply module frame, which comprises two ports disposed oppositely; a power supply distribution frame; and a fan assembly, which comprises a fan frame and a fan fixed on the fan frame, wherein the power supply distribution frame and the fan frame are arranged in a same row as the power supply module frame and are detachably connected with the two ports of the power supply module frame. The tower UPS frame of the utility model is convenient in assembly and disassembly and reduces repair cost.

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Shenzhen, China

Dawei Zheng