Three-phase alternating current charging circuit

Abstract

The utility model discloses a three-phase alternating current charging circuit, which comprises a three-phase full-wave rectification filter circuit, the three-phase full-wave rectification filter circuit is a three-phase full-wave rectification circuit consisting of six No.1 rectification diodes, and the direct current output of the three-phase full-wave rectification circuit is connected with a full-bridge power conversion circuit; the full-bridge power conversion circuit is a full-bridge phase shift circuit composed of four insulated gate bipolar transistors, and the full-bridge phase shift circuit is connected with a primary winding of the high-frequency transformer; and the secondary winding of the high-frequency transformer is connected into a bridge rectifier circuit consisting of four third rectifier diodes and is connected with a load through the output end of the bridge rectifier circuit. According to the technology, a high-frequency pulse alternating current form is adopted, battery charging can be more efficiently carried out, and the charging efficiency and the charging speed are improved.

Description

Technical Field

[0001] The utility model relates to a power compensation circuit, in particular to a three-phase alternating current power compensation circuit. Background Art

[0002] The battery recharging process of electronic devices, battery-driven devices and some specific applications, such as electric vehicles, solar photovoltaic systems and some communication equipment, is to convert AC power into DC power through AC-DC modules, and then recharge the batteries. With the acceleration of the pace of society, the demand for higher charging efficiency and charging speed is increasing day by day, but fast charging means higher power transmission. Traditional AC-DC modules need to be combined with transformer modules to achieve this, resulting in high investment and maintenance costs. Utility Model Content

[0003] In order to solve the deficiencies existing in the above-mentioned technologies, the utility model provides a three-phase alternating current power replenishment circuit.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is a three-phase AC power supplement circuit, including a three-phase full-wave rectifier filter circuit, the three-phase full-wave rectifier filter circuit is a three-phase full-wave rectifier circuit composed of six No. 1 rectifier diodes, and the DC output of the three-phase full-wave rectifier circuit is connected to a full-bridge power conversion circuit;

[0005] The full-bridge power conversion circuit is a full-bridge phase-shift circuit composed of four insulated gate bipolar transistors, and the full-bridge phase-shift circuit is connected to the primary winding of the high-frequency transformer; the secondary winding of the high-frequency transformer is connected to the bridge rectifier circuit composed of four No. 3 rectifier diodes, and the load is connected through the output end of the bridge rectifier circuit. Furthermore, the six No. 1 rectifier diodes in the three-phase full-wave rectifier filter circuit are connected to the input of the three-phase AC power in pairs, and the common cathode nodes of three No. 1 rectifier diodes in the six No. 1 rectifier diodes and the common anode nodes of the remaining three No. 1 rectifier diodes are connected in series with No. 1 capacitors and No. 1 inductors, and the common end of the capacitor and the inductor forms a DC output connected to the full-bridge power conversion circuit;

[0006] Furthermore, the four insulated gate bipolar transistors of the full-bridge power conversion circuit are divided into two groups, and the polarities of the two groups of insulated gate bipolar transistors are opposite.

[0007] Furthermore, each insulated gate bipolar transistor is connected in parallel with a No. 2 rectifier diode and a No. 2 capacitor.

[0008] Furthermore, a No. 2 inductor is connected in series with the primary winding of the transformer.

[0009] The utility model discloses a three-phase AC power replenishment circuit. This technology mainly converts AC power into DC power by circuit conversion, and further converts DC power into high-frequency pulse AC power, and finally converts it into the required DC power by step-down rectification to complete the AC power replenishment of the battery. Compared with the common AC-DC conversion module power replenishment method, this technology adopts the form of high-frequency pulse AC power, which can more efficiently replenish the battery and improve the power replenishment efficiency and charging speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is the circuit diagram of the three-phase full-wave rectifier filter circuit.

[0011] Figure 2 It is the circuit diagram of full-bridge power conversion circuit and bridge rectifier circuit. DETAILED DESCRIPTION

[0012] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0013] like Figure 1 and Figure 2 The three-phase AC power supply circuit shown includes a three-phase full-wave rectifier and filter circuit. The three-phase full-wave rectifier and filter circuit is a three-phase full-wave rectifier circuit composed of six No. 1 rectifier diodes. The DC output of the three-phase full-wave rectifier circuit is connected to a full-bridge power conversion circuit. The full-bridge power conversion circuit is a full-bridge phase-shift circuit composed of four insulated gate bipolar transistors. The full-bridge phase-shift circuit is connected to the primary winding of the high-frequency transformer. The secondary winding of the high-frequency transformer is connected to a bridge rectifier circuit composed of four No. 3 rectifier diodes and connected to the load through the output end of the bridge rectifier circuit. Figure 1 As shown, in the specific three-phase full-wave rectifier filter circuit, there are six No. 1 rectifier diodes D1, D2, D3, D4, D5, and D6. The six No. 1 rectifier diodes are connected to the input of the three-phase AC power in pairs. A No. 1 capacitor Ca and a No. 1 inductor La are connected in series between the common cathode nodes of three No. 1 rectifier diodes D1, D2, and D3 among the six No. 1 rectifier diodes and the common anode nodes of the remaining three No. 1 rectifier diodes D4, D5, and D6. The common end of the capacitor and the inductor forms a DC output connected to the full-bridge power conversion circuit.

[0014] When the circuit is connected, the unidirectional conductivity of the rectifier diode can ensure that the two diodes are connected at the same time, forming a power supply circuit together. For example, during this period of time, the potential of phase A is the highest and the potential of phase B is the lowest. Therefore, the No. 1 rectifier diode D1 and No. 1 rectifier diode D5 connected between phase A and phase B are conducting, and the current flows out of phase A, through the No. 1 rectifier diode D1, the No. 1 capacitor Ca and the No. 1 inductor La, the No. 1 rectifier diode D5, and returns to phase B. During this period of time, the other four diodes are subjected to reverse voltage and cut off. Because D5 is turned on, the voltage of phase B is the lowest, and it is added to the anode of the No. 1 rectifier diode D4 and the No. 1 rectifier diode D6, so the No. 1 rectifier diode D4 and the No. 1 rectifier diode D6 are cut off; because the No. 1 rectifier diode D1 is turned on, the voltage of phase A is the highest, and it is added to the cathode of the No. 1 rectifier diode D2 and the No. 1 rectifier diode D3, so the No. 1 rectifier diode D2 and the No. 1 rectifier diode D3 are cut off. The rest of the sections are similar.

[0015] The four insulated gate bipolar transistors of the full-bridge power conversion circuit are divided into two groups, and the polarities of the two groups of insulated gate bipolar transistors are opposite. The full-bridge phase-shift circuit is composed of insulated gate bipolar transistors Q1, Q2, Q3, and Q4. Each insulated gate bipolar transistor is connected in parallel with a second rectifier diode D7 and a second capacitor Cb. When the insulated gate bipolar transistors Q1, Q1 and Q3, Q2, Q2 and Q4 are turned on, there are four currents. The directions of the currents turned on by the insulated gate bipolar transistors Q1, Q1 and Q3 are opposite to the directions of the currents turned on by the insulated gate bipolar transistors Q2, Q2 and Q4. By controlling the switching of the insulated gate bipolar transistors, high-frequency pulse AC can be obtained. The high-frequency pulse AC is then stepped down by a high-frequency transformer and rectified by a rectifier diode to obtain a DC current for charging the battery. The current value is related to the primary-to-secondary turns ratio of the high-frequency transformer. By smoothing the on-off of the switching power transistor, the burrs in the voltage waveform and the electromagnetic interference to the circuit can be reduced. At the same time, the power loss can be reduced and the power efficiency can be improved.

[0016] A No. 2 inductor Lb is connected in series with the primary winding of the transformer T to increase the transformer leakage inductance to increase the energy used to discharge the switch output capacitor. This circuit has a large circulating energy, the conduction loss of the converter is large, and the duty cycle loss is increased.

[0017] Finally, the required charge is rectified by the No. 3 rectifier diode D8. Thus, the three-phase full-wave rectifier filter circuit and the full-bridge power conversion circuit complete the conversion of AC to DC. The full-bridge power conversion circuit completes the conversion of DC to AC. The bridge rectifier circuit converts AC to DC. This technology converts AC to DC through circuit conversion, and then converts DC to high-frequency pulse AC, and then steps down and rectifies it into DC to charge the battery, forming an AC-DC-AC-DC conversion to complete AC charging. In summary:

[0018] High-voltage pulse rectification converts the input AC power into DC power through a high-voltage pulse rectifier bridge.

[0019] High-frequency rectification, through four high-frequency rectifier bridges, converts direct current into high-frequency pulse alternating current.

[0020] Step-down rectification: The high-frequency pulsed AC power is stepped down and rectified through the step-down rectification circuit to obtain the required DC voltage.

[0021] The charging current output is rectified by a rectifier diode, and the resulting DC voltage is converted into a charging current for charging the battery.

[0022] This technology mainly converts AC power into DC power through circuit conversion, and further converts DC power into high-frequency pulse AC power, and finally converts it into the required DC power through step-down rectification to complete AC charging of the battery.

[0023] Through the above steps, the conversion from AC to DC, then to high-frequency pulse AC, and then to DC is realized, thus completing the AC charging of the battery. Compared with the common AC-DC conversion module charging method, this technology uses high-frequency pulse AC, which can more efficiently charge the battery, improving the charging efficiency and charging speed.

[0024] The above implementation modes are not limitations of the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by technicians in this technical field within the technical solution of the present invention also belong to the protection scope of the present invention.

Claims

1. A three-phase AC power compensation circuit, characterized in that: It includes a three-phase full-wave rectifier filter circuit, which is a three-phase full-wave rectifier filter circuit composed of six No. 1 rectifier diodes, and the DC output of the three-phase full-wave rectifier circuit is connected to a full-bridge power conversion circuit; The full-bridge power conversion circuit is a full-bridge phase-shift circuit composed of four insulated gate bipolar transistors, and the full-bridge phase-shift circuit is connected to the primary winding of the high-frequency transformer; the secondary winding of the high-frequency transformer is connected to a bridge rectifier circuit composed of four No. 3 rectifier diodes and connected to the load through the output end of the bridge rectifier circuit.

2. The three-phase AC power compensation circuit according to claim 1, characterized in that: In the three-phase full-wave rectification and filtering circuit, six No. 1 rectifier diodes are connected to the input of three-phase alternating current in pairs, and a No. 1 capacitor and a No. 1 inductor are connected in series between the common cathode nodes of three No. 1 rectifier diodes among the six No. 1 rectifier diodes and the common anode nodes of the remaining three No. 1 rectifier diodes. The common end of the capacitor and the inductor forms a direct current output connected to the full-bridge power conversion circuit.

3. The three-phase AC power compensation circuit according to claim 1, characterized in that: The four insulated gate bipolar transistors of the full-bridge power conversion circuit are divided into two groups, and the polarities of the two groups of insulated gate bipolar transistors are opposite.

4. The three-phase AC power compensation circuit according to claim 1, characterized in that: Each insulated gate bipolar transistor is connected in parallel with a No. 2 rectifier diode and a No. 2 capacitor.

5. The three-phase AC power compensation circuit according to claim 1, characterized in that: A No. 2 inductor is connected in series with the primary winding of the transformer.

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