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Driving method of full-bridge soft switch inverter circuit

A technology of an inverter circuit and a driving method, which is applied in the direction of electrical components, high-efficiency power electronic conversion, and output power conversion devices, and can solve problems such as the complexity of the drive control of the full-bridge soft-switching inverter circuit, and achieve simple drive control and reduced Power consumption, the effect of increasing the inverter frequency

Inactive Publication Date: 2015-03-11
PANASONIC WELDING SYST TANGSHAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, when the adjustment is made, the dead time between the leading arms and the lagging arms will change, which makes the drive control of the full-bridge soft-switching inverter circuit complicated.

Method used

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  • Driving method of full-bridge soft switch inverter circuit
  • Driving method of full-bridge soft switch inverter circuit
  • Driving method of full-bridge soft switch inverter circuit

Examples

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no. 1 example

[0019] Refer below figure 1 and figure 2 Describe the hardware circuit of the full-bridge soft-switching inverter circuit of the present invention.

[0020] Such as figure 1 As shown, the full-bridge soft-switching inverter circuit includes power switching devices Q1~Q4 (IGBTs with internal diodes), main transformer TR1, external inductor L1, DC blocking capacitor C4, and absorbing capacitors C2 and C3. Among them, Q1 and Q2 are super-forearms, and Q3 and Q4 are lagging arms. As shown in the figure, the super-forearm Q1 and the lagging arm Q4 are conducted in a pair, and the super-forearm Q2 and the lagging arm Q3 are conducted in a pair.

[0021] figure 2 show figure 1 The driving circuits of each power switching device in Q1-Q4 are shown. Each of Q1-Q4 is connected to the driving circuit. In this embodiment, the driving circuit is isolated by using a pulse transformer.

[0022] Below, refer to figure 2 Describe the operating principle of the drive circuit.

...

no. 2 example

[0041] Next, a second embodiment of the present invention is described.

[0042] The hardware circuit constitution of the second embodiment is exactly the same as that of the first embodiment (see figure 1 and figure 2 ), and will not be described again here. In the following, only the differences between the two are described.

[0043] The difference between the second embodiment and the first embodiment is only that the opening of the super-forearm Q1 and the closing of the lagging arm Q3 do not occur at the same time, but the lagging arm Q3 is turned off first, and then the super-forearm Q1 is turned on. In addition, the turn-on of the super-forearm Q2 and the turn-off of the lagging arm Q4 do not occur at the same time, but the lagging arm Q4 is turned off first, and then the super-forearm Q2 is turned on (see Figure 4 ). However, it should be noted that the turn-on moments of the advanced forearms Q1 and Q2 are still within the dead time range of the lagging arms Q...

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Abstract

The invention provides a driving method of a full-bridge soft switch inverter circuit. The full-bridge soft switch inverter circuit comprises a leading leg Q1, a leading leg Q2, a lagging leg Q3 and a lagging leg Q4, wherein the leading leg Q1 and the lagging leg Q4 are powered on in pairs; the leading leg Q2 and the lagging leg Q3 are powered on in pairs. The driving method comprises the following steps: controlling the two lagging legs Q3 and Q4 so as to fix the power-on time and the power-on moment of the two lagging legs Q3 and Q4 within a signal period; and performing PWM control on the two leading legs Q1 and Q2 so as to enable the power-on moment of the two leading legs Q1 and Q2 to be in a dead zone time range of the two lagging legs Q3 and Q4. By adopting the driving method, the power consumption of a low-power switch device is effectively reduced, the inversion frequency is increased, and the driving control of the full-bridge soft switch inverter circuit is simpler and more convenient.

Description

[technical field] [0001] The invention relates to a driving technology of a full-bridge soft-switching inverter circuit. [Background technique] [0002] Inverter circuits have been widely used in various industrial fields. For example, various switching power supplies, motor speed regulation, frequency converters and traction drives, etc. The inverter circuit includes a half-bridge inverter circuit and a full-bridge inverter circuit. Compared with the half-bridge inverter circuit, the switching current of the full-bridge inverter circuit is reduced by half, so it is widely used in high-power applications. [0003] Traditionally, the full-bridge inverter circuit is divided into hard switching and soft switching according to the switching mode. The hard switching method refers to a control method in which the current and voltage of the power switching device are not zero when the power switching device is turned on or off. The hard switching method has disadvantages such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02M1/08
CPCH02M1/08H02M7/5387H02M1/0058Y02B70/10
Inventor 陈建辉刘作英何双旺
Owner PANASONIC WELDING SYST TANGSHAN
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