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Alternating current-direct current converting circuit and control method thereof

一种直流变换电路、逆变电路的技术，应用在交流功率输入变换为直流功率输出、直流功率输入变换为直流功率输出、不可逆的交流功率输入变换为直流功率输出等方向，能够解决二极管串联损耗大、输出电压电流纹波大、变化等问题，达到减少二极管损耗、降低电压应力和开关损耗、降低电压应力的效果

Active 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

[0002] Single-stage power factor (Power Factor, PF for short) corrector, active clamp flyback, active clamp forward and their improvement schemes belonging to soft switching technology have been widely used in power supplies. A US patent document US7301785B2 discloses A switching power supply circuit, the voltage stress of the switching tube on the primary side of the converter circuit will change with the load condition, and will shift to a high level when it is fully loaded, which has not fundamentally overcome the shortcomings of the typical resonance technology. Therefore, Its usable power range, input and output voltage variation range is limited
Chinese patent document CN101692595B discloses an active clamp forward-flyback circuit, which is improved compared to other disclosed circuits, but its primary side may not need a large-capacity electrolytic capacitor because of the need for AC rectification and filtering , but the actual use still requires an additional high-frequency filter capacitor, and the AC input side must also use a full-bridge rectifier
The rectification circuit on the secondary side is complex, whether it is the input rectification circuit or the output rectification circuit, the loss of multiple diodes in series is relatively large
At the same time, when there is no large-capacity input electrolytic capacitor, the output voltage and current ripples are very large; it is difficult to apply to a larger power AC-DC conversion circuit in actual use, and it is generally more suitable for DC-DC conversion.
In addition, when the input of the converter is AC, due to the change of the corresponding driving duty cycle due to the periodic change of the input voltage, the clamp circuit will increase the loss in the low-voltage input part because the resonance condition is not satisfied, reducing the The stability and reliability of the circuit

Method used

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  • Alternating current-direct current converting circuit and control method thereof
  • Alternating current-direct current converting circuit and control method thereof
  • Alternating current-direct current converting circuit and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] like figure 1 The shown AC-DC conversion circuit includes input rectification circuit, primary side input filter capacitors C1, C2, primary side inverter circuit, drive circuit, high frequency isolation transformer T1, secondary side rectification circuit, secondary side third and fourth Capacitors C3, C4, secondary output filter capacitor C5, and a control circuit connected between the secondary output filter capacitor C5 and the driving circuit.

[0031] The input rectification circuit includes two input rectification diodes D1 and D2, the anode of the input rectification diode D1 and the cathode of the input rectification diode D2 are connected to the AC input live wire L, and the primary side input filter capacitor includes an AC input neutral line N as the midpoint Two input high-frequency filter capacitors C1 and C2 are connected in series, and the opposite ends of the two input high-frequency filter capacitors C1 and C2 are respectively connected to the positive ...

Embodiment 2

[0065] The invention also provides an AC-DC conversion circuit with two-phase, three-phase or more phase input. like Figure 4 Shown is a three-phase four-wire input AC-DC conversion circuit, the basic circuit composition and beneficial effects are the same as those in Embodiment 1, the difference is that the input is three-phase. The advantage is that in theory, an output voltage with better output voltage characteristics than that of Embodiment 1 can be obtained, the output voltage is smoother, and the ripple voltage is smaller. Figure 4 Among them, D1a, D2a, D1b, D2b, D1c, D2c represent the primary side rectifier diodes, C1a, C2a, C1b, C2b, C1c, C2c represent the primary side filter capacitors, Q1a, Q2a, Q1b, Q2b, Q1c, Q2c represent the primary side Inverter switching tubes, T1a, T1b, T1c represent transformers, D3a, D4a, D3b, D4b, D3c, D4c represent secondary side rectifier diodes, C3a, C4a, C5b, C3b, C4b, C5b, C3c, C4c, C5c represent secondary side filter capacitor.

Embodiment 3

[0067] The invention also provides another two-phase, three-phase or more phase input AC-DC conversion circuit. like Figure 5 Shown is a three-phase three-wire input AC-DC conversion circuit, the basic circuit composition and beneficial effects are the same as those of the second embodiment, the difference is that the input has no neutral line input. The advantage is that the aforementioned performance can still be achieved in the actual three-phase three-wire input environment without neutral line input.

[0068] The circuit of the present invention has two different working modes, forward and reverse, and can realize a larger adjustment range of input and output voltages, and at the same time, the input current can also track the input voltage to realize power factor correction. At the same time, due to the function of the active clamp circuit, it can reduce the reverse recovery voltage peak and switching loss caused by the leakage inductance of the isolation transformer and...

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Abstract

The invention discloses an alternating current-direct current converting circuit and a control method thereof. The alternating current-direct current converting circuit comprises an input rectification circuit, a primary side input filter capacitor, a primary side inverter circuit, a drive circuit, an isolation transformer, an auxiliary side rectification circuit, an auxiliary side capacitor and a control circuit, wherein the control circuit is connected between the auxiliary side output filter capacitor and the drive circuit, the drive circuit is connected with the primary side inverter circuit, the primary side inverter circuit and the primary side input filter capacitor form a loop to form a clamping resonance circuit, and inversion switching tubes work in a no-voltage switching state. The auxiliary side rectification circuit has two work modes of forward and flyback, and the first and second inversion switching tubes in the primary side inverter circuit are used as inversion switching tubes or clamping switching tubes according to work periods. According to the alternating current-direct current converting circuit and the control method thereof, diode loss in the rectification loop can be reduced, soft switching of the inversion switching tubes is achieved, voltage stress and switching loss of a primary side switching tube and an auxiliary side rectifier diode are reduced, and efficiency is improved.

Description

technical field [0001] The invention relates to a switching power supply, in particular to an AC-DC conversion circuit and a control method thereof. Background technique [0002] Single-stage power factor (Power Factor, PF for short) corrector, active clamp flyback, active clamp forward and their improvement schemes belonging to soft switching technology have been widely used in power supplies. A US patent document US7301785B2 discloses A switching power supply circuit, the voltage stress of the switching tube on the primary side of the converter circuit will change with the load condition, and will shift to a high level when it is fully loaded, which has not fundamentally overcome the shortcomings of the typical resonance technology. Therefore, Its usable power range, input and output voltage variation range is limited. Chinese patent document CN101692595B discloses an active clamp forward-flyback circuit, which is improved compared to other disclosed circuits, but its pri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/06H02M3/335H02M1/42
CPCH02M1/4216H02M1/4258H02M7/217Y02B70/10Y02P80/10H02M1/0058H02M3/33571H02M3/01
Inventor 李伦全
Owner SHENZHEN BOYN ELECTRIC
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