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A bias circuit for self-excited push-pull converter

A bias circuit, self-excited push-pull technology, used in output power conversion devices, DC power input conversion to DC power output, instruments, etc., can solve the problem that the efficiency cannot be further improved, and achieve the effect of achieving efficiency

Active Publication Date: 2017-08-29
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] Efficiency cannot be further improved

Method used

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  • A bias circuit for self-excited push-pull converter
  • A bias circuit for self-excited push-pull converter
  • A bias circuit for self-excited push-pull converter

Examples

Experimental program
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Effect test

no. 1 example

[0058] see Figure 4 , Figure 4 It is a functional block diagram of the original technical solution of the present invention, a bias circuit of a self-excited push-forward converter, which is applied to a self-excited push-forward converter including Royer circuit and Jingsen circuit, including a first start-up circuit 11, A second start-up circuit 12, a low-voltage auxiliary power supply 13, and a first diode D1;

[0059] The first start-up circuit 11 is the start-up circuit of the original self-excited push-forward converter, including at least one first capacitor, and the input end connected to the working voltage Vin of the self-excited push-forward converter is no longer connected to the input working voltage The input end of the first start-up circuit 11 is connected to the cathode of the first diode D1;

[0060] The low-voltage auxiliary power supply 13 includes: an auxiliary winding N wound on the main transformer B2 A , the second diode D2, and the second capacito...

no. 2 example

[0088] see Figure 4 , Figure 4 It is a functional block diagram of the original technical solution of the present invention, and the connection relationship is the same as that of Embodiment 1, and will not be repeated here.

[0089] Figure 6 The specific circuit of the second embodiment is given, the above Figure 4 In the original technical solution, the second start-up circuit 12 in the second embodiment includes: a first triode Q1, a second triode Q2, a third triode Q3, and a first resistor R1, a second resistor R2 , the third resistor R3, the fourth resistor R4, and the fifth resistor R5, wherein the first triode Q1 and the third triode Q3 are of PNP type, and the second triode Q2 is of NPN type, and their connection relationship is: The emitter of the first triode Q1 is connected to the emitter of the third triode Q3, the connection point is also connected to one end of the fifth resistor R5, the connection point forms the input end of the second start-up circuit, ...

no. 3 example

[0111] see Figure 8 , Figure 8 still obey Figure 4 The connection relationship of the original technical solution, in Example 1, is used to describe Figure 4 Connections still apply to Figure 8 connection relationship.

[0112] Here we focus on the corresponding scheme three Figure 8 The connection relationship and working principle of the scheme:

[0113] Figure 8 It appears to be very simple, and the third scheme of the second start-up circuit 12 includes: the first triode Q1, the first resistor R1, the second resistor R2, the third resistor R3, and an optocoupler N1, wherein the first triode The tube is PNP type, and its connection relationship is: the emitter of the first triode Q1 is connected to the collector of the optocoupler N1, and the connection point forms the input end of the second start-up circuit, which is connected to the working voltage Vin; one end of the first resistor R1 is connected to the The collectors of the first triode Q1 are connected,...

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Abstract

A bias circuit of a self-excited push-forward converter, including a second start-up circuit 12, a first start-up circuit 11, and a low-voltage auxiliary power supply 13 that only work when starting the machine. When the self-excited push-forward converter works normally , the output voltage of the low-voltage auxiliary power supply 13 turns off the second start-up circuit, and at the same time supplies power to the first start-up circuit 11, which realizes low power consumption during normal operation and improves the conversion efficiency of the self-excited push-forward converter; the second The bias current of the start-up circuit can be set relatively large. When the converter is in a low-temperature environment, the low-temperature start-up performance of the prior art is not good due to the reduction of the triode amplification factor. The present invention overcomes this deficiency.

Description

technical field [0001] The invention relates to a bias circuit of a self-excited push-pull converter, in particular to a bias circuit used in a Royer circuit and a Wellmori circuit. Background technique [0002] The existing self-excited push-pull converters are generally divided into two categories: Royer circuit and Weller circuit. [0003] The Royer circuit comes from the self-excited oscillating push-pull transistor single-transformer DC converter invented by G.H.Royer in 1955, usually referred to as the Royer circuit, which is also the beginning of the realization of high-frequency conversion control circuits; Jen Sen, most of the literature is translated as "Jingsen") invented the self-excited push-pull double transformer circuit, which was later called the self-oscillating Jensen circuit, the self-excited push-pull Jensen circuit, and most of the literature is called the Jingsen circuit; Both circuits are called self-excited push-pull converters. [0004] figure 1 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/337H02M1/36
CPCH02M1/36H02M3/3382H02M1/0032Y02B70/10
Inventor 王保均
Owner MORNSUN GUANGZHOU SCI & TECH
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