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DC (Direct Current)-AC (Alternating Current) transfer circuit and control method thereof

A technology for converting circuits and DC power supplies, which is applied in the direction of converting AC power input to DC power output, photovoltaic power generation, and electrical components. The effect of increasing frequency

Inactive Publication Date: 2014-05-21
SHENZHEN BOYN ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When this kind of conversion circuit is working, the power components of the front-stage boost circuit need to bear all the working current. When the latter stage is working, the bus voltage needs to be step-down and inverted in the entire output voltage range, so the power tube’s Greater loss

Method used

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  • DC (Direct Current)-AC (Alternating Current) transfer circuit and control method thereof
  • DC (Direct Current)-AC (Alternating Current) transfer circuit and control method thereof
  • DC (Direct Current)-AC (Alternating Current) transfer circuit and control method thereof

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Embodiment 1

[0023] like figure 1 The shown DC-AC conversion circuit includes boost inductor L1, boost switch tube Q7, rectifier diode D8, first to fourth capacitors C1, C2, C3, C4, inverter bridge freewheeling diode D2, inverter bridge, The first to the second output filter inductors L2, L3.

[0024] In the DC-AC conversion circuit, one end of the boost inductor L1 is connected to the positive input end of the DC power supply, and the other end is connected to the drain of the boost switch tube Q7 and the anode of the rectifier diode D8; the boost The source of the switch tube Q7 is connected to the negative input terminal of the DC power supply DC input; the cathode of the rectifier diode D8 is connected to the positive pole of the second capacitor C2 through the positive bus bus; the negative pole of the second capacitor C2 is connected to the DC power supply The positive input terminal of the fourth capacitor C4 is connected in parallel with the first capacitor C1, and the positive po...

Embodiment 2

[0032] like Figure 4 As shown, it is another embodiment of the present invention, the difference is that the switch tube Q2 in the circuit replaces the D2 of the first embodiment. When the inverter output waveform is in the aforementioned region ①③, the switching tube Q2 can be always turned on by applying a high level, which is equivalent to the synchronous rectification in the first embodiment. In the foregoing ② and ④ region, when freewheeling is required, the switching tube Q2 can be turned on by applying a PWM driving signal complementary to the switching tube Q1. The other parts are not different from the embodiment, so they will not be described again.

[0033] The switching tubes in the present invention can be various high-speed bidirectional switches controlled by driving signals, such as MOSFETs or IGBTs, and are not limited to the power semiconductor switches shown in the figure.

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Abstract

The invention discloses a DC (Direct Current)-AC (Alternating Current) transfer circuit and a control method thereof. The DC-AC circuit comprises a boost inducer, a boost switch tube, a rectifier diode, from first to fourth capacitors, an inverter bridge FWD (Fly-Wheel Diode), and from first to second output filter inducers. The invention further discloses a control method of the AC-DC transfer circuit. By using the different inversion working models of the boost circuit and the inverter bridge circuit, the invertion can be maximally performed by using the voltage of the DC input source, the working current of the boost circuit and the switching stress of all elements in an inverter bridge loop can be reduced, the working loss of the main elements of the boost circuit can be reduced, and the switching loss of all elements in the inverter bridge loop can be reduced, so that the efficiency and power density can be improved.

Description

technical field [0001] The invention relates to a switching power supply, in particular to a DC-AC conversion circuit and a control method thereof. Background technique [0002] In existing DC-AC conversion applications, such as photovoltaic inverters, when the input DC source voltage is not high enough, or the input range is wide, a boost circuit will be used to add Inverter conversion circuit. When this kind of conversion circuit is working, the power components of the front-stage boost circuit need to bear all the working current. When the latter stage is working, the bus voltage needs to be step-down and inverted in the entire output voltage range, so the power tube’s The loss is large. Therefore, it is necessary to design a new circuit that can directly use the DC source input voltage for inversion as much as possible. When a bus voltage higher than the input voltage is required, restart or use the energy of the boosted high-voltage bus to obtain Higher cost performa...

Claims

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Application Information

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IPC IPC(8): H02M7/537
CPCY02E10/56
Inventor 李伦全
Owner SHENZHEN BOYN ELECTRIC
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