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Push-pull converter

A technology of converters and transformers, applied in the field of switching power supplies, which can solve problems such as slow start-up process and complicated drive circuit design

Inactive Publication Date: 2014-12-03
ZTE QUANTUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of this method are: 1) The design of the drive circuit is very complex and highly targeted, and different types of switch tubes need to match different parameters; 2) The boot process is very slow, and it may take several minutes or even ten a few minutes

Method used

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  • Push-pull converter

Examples

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Embodiment Construction

[0012] figure 1 It is the circuit diagram of Embodiment 1 of the push-pull converter of the present invention, the push-pull converter includes transformer TX1, MOS transistors Q1, Q2, columnar high-frequency inductor L1, high-frequency film capacitor C1, rectifier module, filter inductor L2 and output capacitor C2 , and, the rectification module is a diode rectification bridge composed of four diodes DP1, DP2, DP3 and DP4. Among them, on the primary side of the transformer TX1, the sources of the MOS transistors Q1 and Q2 share the ground, and the drains of the MOS transistors Q1 and Q2 are respectively connected to the two ends (p2 and m3) of the primary winding of the transformer TX1. What needs to be explained here Yes, the gates of the MOS transistors Q1 and Q2 are connected to a driving circuit (not shown). The first end of the columnar high-frequency inductor L1 is connected to the positive terminal (INPUT) of the input power supply, the negative terminal (INPUT_GND) o...

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PUM

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Abstract

The invention discloses a push-pull converter. The push-pull converter comprises a transformer and two switch tubes. The first ends of the two switch tubes are connected to the two ends of a primary side winding of the transformer respectively, and the second ends of the two switch tubes share a common ground. The push-pull converter further comprises a columnar high-frequency inductor and a high-frequency thin-film capacitor, wherein the first end of the columnar high-frequency inductor is connected with the positive end of an input power, and the negative end of the input power is grounded; the second end of the columnar high-frequency inductor is connected with a center tap of the primary side winding of the transformer; and the high-frequency thin-film capacitor is connected between the second end of the columnar high-frequency inductor and the ground. With the application of the technical scheme of the invention, voltage spike generated at the starting instant of the switch tubes can be suppressed; besides, the push-pull converter is simple and effective, and high in applicability.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to a push-pull converter. Background technique [0002] When the push-pull converter is turned on, the output capacitor is short-circuited at the moment of power-on, which reacts to the primary side and generates a large current. This current will be several times the normal stable working current. Push-pull transformers are unavoidable in practical applications. There will be leakage inductance, according to V=Ldi / dt, this current will generate several times the voltage on the leakage inductance during normal operation and add to both ends of the switch tube, so that the switch tube will generate a voltage spike at the moment of power-on. And the switching tube selected according to the normal working voltage will have a certain probability of being blown up when it is turned on. [0003] The current industry practice is to process the drive circuit of the switch tube so th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/337
Inventor 黄榜福曾立王善良李祥忠
Owner ZTE QUANTUM
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