CN-113183778-B - Soft switch charging device of electric automobile

CN113183778BCN 113183778 BCN113183778 BCN 113183778BCN-113183778-B

Abstract

A soft switch charging device of an electric automobile aims to solve the problems of high switching loss and low efficiency of the existing charging device. The power switch is used for realizing zero-current conduction and zero-voltage turn-off, and the diode is used for realizing zero-current conduction and turn-off. By arranging only one power switch, zero-current conduction and zero-voltage turn-off are realized, the structure is simple, the use of a switching device is less, the volume and the cost of the device are reduced, the switching loss of the device is effectively reduced, and the working efficiency of the device is remarkably improved.

Inventors

ZHUANG TONG
WU GANG
XUE LI
LIANG RUIZHI
XU ZIHAN
RAN JUNCHAO
LIU KAI
ZHANG BIAO

Assignees

北京国网普瑞特高压输电技术有限公司

Dates

Publication Date: 20260508
Application Date: 20210402

Claims (3)

1. The soft switch charging device of the electric automobile comprises an alternating-current voltage source, a PFC rectification module, a DC/DC conversion module, a charging module and a rechargeable battery; The alternating voltage source is used for providing alternating voltage and inputting the alternating voltage into the PFC rectification module; The PFC rectification module receives alternating voltage provided by an alternating voltage source, rectifies and corrects the alternating voltage and provides a first direct voltage; The DC/DC conversion module is used for receiving the first direct-current voltage and boosting the first direct-current voltage to a second direct-current voltage, and the second direct-current voltage is a direct-current bus voltage; The charging module receives the second direct-current voltage, performs charging control and outputs a desired charging power supply and current to the rechargeable battery; the DC/DC conversion module comprises a power switch and a diode, wherein the power switch is used for realizing zero current conduction and zero voltage turn-off, the diode is used for realizing zero current turn-on and turn-off, the DC/DC conversion module comprises a second inductor, a third inductor, a fourth inductor, a second power switch, a second capacitor, a third capacitor, a fourth capacitor, an isolation transformer, a fifth diode and a sixth diode, wherein a serial branch consisting of the second inductor, the third inductor and the second power switch is connected in parallel with two ends of a first capacitor, the second inductor is connected in parallel with two ends of a primary winding of the isolation transformer, one end of the second inductor is connected with a homonymous end of the primary winding of the isolation transformer, the other end of the second inductor is connected with one end of the third inductor, the other end of the third inductor is connected with a drain electrode of the second power switch, the second capacitor is connected in parallel with two ends of the second power switch, the homonymous end of the secondary winding of the isolation transformer is connected with one end of the fourth inductor, the other end of the fourth inductor is connected with an anode of the fifth diode and the other end of the negative electrode of the isolation transformer, the other end of the negative electrode of the fourth capacitor is connected with the negative electrode of the fourth capacitor, the other end of the positive electrode of the fourth capacitor is connected with the positive electrode of the negative electrode of the fourth capacitor is connected with the negative electrode of the fourth capacitor, and the other end of the negative electrode of the fourth capacitor is connected with the negative electrode of the fourth capacitor.
2. The soft switching charging device of an electric automobile of claim 1, wherein the PFC rectification module comprises a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a first inductor, a first power switch and a first capacitor, wherein cathodes of the first diode and the second diode are connected with one end of the first inductor, anodes of the first diode and the second diode are respectively connected with cathodes of the third diode and the fourth diode and are respectively connected with two ends of an alternating voltage source, anodes of the third diode and the fourth diode, the other end of the first inductor is connected with an anode of the fifth diode, the other end of the first inductor is simultaneously connected with a drain electrode of the first power switch, a source electrode of the first power switch is connected with anodes of the third diode and the fourth diode, a cathode of the fifth diode is connected with one end of the first capacitor, and the other end of the first capacitor is connected with a source electrode of the first power switch.
3. The soft-switch charging device of claim 2, wherein the charging module comprises a third power switch, wherein one end of the third power switch is connected to the positive electrode of the fourth capacitor, and the other end is connected to a rechargeable battery.

Description

Soft switch charging device of electric automobile Technical Field The invention relates to a soft switch charging device of an electric automobile, and belongs to the field of electric automobile charging. Background Automobiles become an important tool for riding instead of walking in life, however, carbon monoxide, nitrides and other polluted gases generated by automobile exhaust seriously affect the living environment of human beings, and global energy exhaustion is another problem facing human beings. The electric automobile uses electricity as power, and the electric automobile can replace a fuel oil automobile to become the best choice for human travel. In the research and development process of electric automobiles, a charging circuit and a charging control method are always hot problems of research. The development of high performance, high efficiency, and high power density chargers would be advantageous for the development of the entire electric vehicle industry. The charging device of the electric automobile generally comprises a switching power supply and has different topological structures according to different occasions. The soft switching power supply is also applied to an electric automobile charging circuit, a full-bridge soft switching isolation converter is adopted, the magnetic core of the converter has high utilization rate, the high efficiency can be realized by utilizing the parasitic parameters of the converter, and the full-bridge soft switching isolation converter is widely applied to medium and high power occasions. Common soft switching power supplies include full-bridge soft switching isolation converters such as full-bridge zero voltage, full-bridge zero voltage zero current, full-bridge zero current switches and resonant converters. However, the existing charging device has the characteristics of more switching devices and low efficiency. Disclosure of Invention The invention provides a soft switch charging device of an electric automobile, which aims to solve the problems of high switching loss and low efficiency of the existing charging device. The power supply comprises an alternating-current voltage source, a PFC rectification module, a DC/DC conversion module, a charging module and a rechargeable battery; The alternating voltage source is used for providing alternating voltage and inputting the alternating voltage into the PFC rectification module; The PFC rectification module receives alternating voltage provided by an alternating voltage source, rectifies and corrects the alternating voltage and provides a first direct voltage; The DC/DC conversion module is used for receiving the first direct-current voltage and boosting the first direct-current voltage to a second direct-current voltage, and the second direct-current voltage is a direct-current bus voltage; The charging module receives the second direct-current voltage, performs charging control and outputs a desired charging power supply and current to the rechargeable battery; The DC/DC conversion module comprises a power switch and a diode, wherein the power switch is used for realizing zero-current conduction and zero-voltage turn-off, and the diode is used for realizing zero-current conduction and turn-off. The PFC rectification module comprises a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a first inductor, a first power switch and a first capacitor, wherein cathodes of the first diode and the second diode are connected with one end of the first capacitor, anodes of the first diode and the second diode are respectively connected with cathodes of the third diode and the fourth diode and are respectively connected with two ends of an alternating voltage source, anodes of the third diode and the fourth diode, the other end of the first inductor is connected with the anode of the fifth diode, the other end of the first inductor is simultaneously connected with a drain electrode of the first power switch, a source electrode of the first power switch is connected with anodes of the third diode and the fourth diode, a cathode of the fifth diode is connected with one end of the first capacitor, and the other end of the first capacitor is connected with a source electrode of the first power switch. The DC/DC conversion module comprises a second inductor, a third inductor, a fourth inductor, a second power switch, a second capacitor, a third capacitor, a fourth capacitor, an isolation transformer, a fifth diode and a sixth diode, wherein a serial branch consisting of the second inductor, the third inductor and the second power switch is connected in parallel with two ends of the first capacitor, the second inductor is connected in parallel with two ends of a primary winding of the isolation transformer, one end of the second inductor is connected with a homonymous end of the primary winding of the isolation transformer, the other end of the second inductor is connected with one end of the