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Control method and apparatus of multi-state switch totem-pole circuit

A multi-state switch and control method technology, which is applied to output power conversion devices, electrical components, and high-efficiency power electronic conversion, etc. The effect of improving energy transfer efficiency

Inactive Publication Date: 2017-06-13
VERTIV ENERGY SYST INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Embodiments of the present invention provide a control method and device for a multi-state switch totem pole circuit, which is used to solve the problem in the prior art that the switching tube on the high-frequency bridge arm cannot be turned on at zero voltage, and can reduce the frequency of the high-frequency bridge. Arm switching frequency, improve the utilization of magnetic components, reduce circuit loss, improve efficiency

Method used

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  • Control method and apparatus of multi-state switch totem-pole circuit
  • Control method and apparatus of multi-state switch totem-pole circuit
  • Control method and apparatus of multi-state switch totem-pole circuit

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Experimental program
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Effect test

Embodiment 1

[0073] exist figure 1 In the positive half cycle of the AC terminal voltage of the multi-state totem pole circuit shown, when the duty cycle of the driving signal of the main switching tube on the high frequency bridge arm is less than 0.5, regardless of the dead time, the driving signal of each switching tube Such as Figure 8 As shown, the period from t0 to t6 is a switching cycle, IL is the current input to the inductor L, that is, the input current, and Ineg is the preset negative current.

[0074] During the period from t0 to t1, the freewheeling switch Q1 is turned off, the main switch Q2 is turned on, the freewheeling switch Q3 is in the on state, and the main switch Q4 is in the off state; in steady state, figure 1 The working state of the shown multi-state totem pole circuit is shown in Fig. 9(a), and the input current IL increases gradually.

[0075] During the period from t1 to t2, the main switch tube Q2 is turned off, the freewheel switch tube Q1 is turned on,...

Embodiment 2

[0088] exist figure 1 In the positive half cycle of the AC terminal voltage of the multi-state totem pole circuit shown, when the duty cycle of the driving signal of the main switching tube on the high frequency bridge arm is greater than 0.5, regardless of the dead time, the driving signal of each switching tube Such as Figure 10 As shown, the period from t0 to t6 is a switching cycle, IL is the current input to the inductor L, that is, the input current, and Ineg is the preset negative current.

[0089] During the period from t0 to t1, the freewheeling switch tube Q1 is turned off, the main switch tube Q2 is turned on, the freewheeling switch tube Q3 is in the off state, and the main switch tube Q4 is in the on state; in steady state, figure 1 The working state of the shown multi-state totem pole circuit is shown in Figure 11(a), and the input current IL increases gradually.

[0090] During the period from t1 to t2, the main switch tube Q4 is turned off, the freewheel s...

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PUM

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Abstract

The invention discloses a control method and apparatus of a multi-state switch totem-pole circuit. By adoption of the control method and apparatus, zero-voltage switch on of a high-frequency bridge arm switching tube can be realized, the switching frequency of a high-frequency bridge arm can be lowered, utilization rate of a magnetic element can be lowered, circuit loss can be lowered, and circuit efficiency can be improved. The control method comprises the steps of obtaining a current of a winding connected with each high-frequency bridge arm in the multi-state switch totem-pole circuit separately; when the alternating current wiring end voltage of the multi-state switch totem-pole circuit is a positive voltage, and when a follow current switching tube on the high-frequency bridge arm connected with the winding is in a switched-on state and a main switching tube is in a switched-off state, if the obtained current of the winding does not reach a preset negative current, controlling the follow current switching tube in the switch-on state to be in the switch-on state continuously, and enabling the main switching tube in the switch-off state to be in the switch-off state continuously; and if the obtained current of the winding reaches the preset negative current, controlling the follow current switching tube in the switch-on state to be switched off and controlling the main switching tube in the switch-off state to be switched on.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a control method and device for a multi-state switch totem pole circuit. Background technique [0002] Figure 1 to Figure 5 Shown are several common multi-state switch totem pole circuits at present, which can be realized by transformers or coupled inductors; specifically, the AC terminal can be the input terminal, the DC terminal can be the output terminal, or the DC terminal can be the output terminal. The input terminal and the AC terminal are the output terminals; when the AC terminal is the input terminal, AC power can be input through the AC terminal, and DC power can also be input through the AC terminal. [0003] In the prior art, a commonly used control method for a multi-state switch totem pole circuit is CRM (Critical Conduction Mode, critical conduction mode) control. However, CRM control can realize zero-voltage turn-on of the switching tube on the high-f...

Claims

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Application Information

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IPC IPC(8): H02M7/00H02M7/12
CPCH02M7/00H02M7/12H02M1/0058Y02B70/10
Inventor 吴屏朱建华
Owner VERTIV ENERGY SYST INC