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Primary winding resonance wave trough sampling circuit and sampling method

A primary winding and sampling circuit technology, applied in electrical components, regulating electrical variables, high-efficiency power electronic conversion, etc., can solve the problems of increasing the volume of the transformer, increasing the cost, and the technical solution cannot meet this requirement, and achieves reduction in use and reduction. Small turn-off loss and volume reduction effect

Active Publication Date: 2019-03-08
MORNSUN GUANGZHOU SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technical solution requires an auxiliary winding, which will increase the volume of the transformer and increase the cost
Moreover, for a small-sized converter without an auxiliary winding, if it is necessary to complete the valley sampling in the primary winding of the transformer, this technical solution will not be able to meet this requirement

Method used

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  • Primary winding resonance wave trough sampling circuit and sampling method
  • Primary winding resonance wave trough sampling circuit and sampling method
  • Primary winding resonance wave trough sampling circuit and sampling method

Examples

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no. 1 example

[0048] The first embodiment consists of Figure 5 The specific circuit diagram of the clamping circuit 101, Image 6 is a specific circuit diagram of the current-voltage conversion circuit 102, and Figure 7 The specific circuit diagram of the voltage domain conversion circuit 103 is realized.

[0049] The following is based on Figure 5 The 101 module circuit, Image 6 The 102 module circuit and Figure 7 The circuit analysis and theoretical calculation of the trough sampling process are given in the 103 module circuit.

[0050] Such as Figure 5 The module circuit shown in 101 includes PMOS transistors PM1, PM2, PM3, and NMOS transistors NM1, NM2. The source of PM1 is connected to the input voltage V in Connection, the gate and drain are connected to the gate of PM2, the gate of PM3, and the drain of NM1; the source of PM2 is connected to the source of FB and PM3, and the drain is connected to the gate of NM1, the gate of NM2 and The drain is connected; the source of...

no. 2 example

[0092] Figure 8 A schematic circuit diagram of the voltage domain conversion circuit 103 in the second embodiment shown. with the first embodiment Figure 7 The difference in the circuit schematic diagram of the voltage domain conversion circuit 103 shown is that Figure 7 The NMOS transistors N1, N2 and N3 are in Figure 8 are replaced by transistors T1, T2 and T3 respectively. The collector of transistor T1 and the bias current source I B connected at one end, I B The current flows to T1, the collector of T1 is also connected to the base of T1 and the base of T2, and the emitter of T1 is connected to the reference ground. The collector of T2 is connected to the drain of P1, the gate of P1, and the gate of P2, and the emitter of T2 is connected to the reference ground. T1 and T2 form a current mirror with a mirror ratio of k1. The collector of T3 is connected to the drain of P2 and the input of Schmitt trigger 201 to form the Va node, and the base of T3 and image 3 V...

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Abstract

The method is suitable for flyback converters, and is particularly suitable for a transformer primary side resonance wave trough sampling circuit in a quasi-resonance working mode or a discontinuous working mode, when the resonance voltage of the primary winding is resonant at the input voltage Vin, a sampling current which is related to the difference value between the resonant voltage and the input voltage Vin is obtained through a clamping circuit, the sampling current is converted into a sampling voltage of a certain voltage domain through a current-to-voltage conversion circuit, the sampling voltage passes through a voltage domain conversion circuit and outputs a wave trough sampling signal, the wave trough sampling signal is in the same phase with the resonance signal, namely, the wave trough sampling signal at the resonance wave trough is a low level, and the wave trough sampling signal at the resonance wave peak is a high level. According to the technical scheme, the structureis simple, the resonance wave trough sampling of the primary winding can be completed, and the conduction loss of the converter can be reduced, the energy of electromagnetic interference is reduced, the size of the converter and the use of discrete devices are reduced, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, and is particularly suitable for a resonant valley sampling circuit and a sampling method of a transformer primary winding in a quasi-continuous working mode. Background technique [0002] Now, the flyback topology is widely used in switching power supplies, especially the low-cost power supply of 5-150W, which benefits from the simple structure of the flyback topology and requires few components. Moreover, the flyback transformer has the dual functions of transformer and inductor, so that the flyback converter can save the output filter inductor, which can reduce the size of the converter and reduce the cost. [0003] Such as figure 1 The circuit shown is the main power topology of the flyback converter, V in is the input voltage of the flyback converter, Cin is the input capacitor, N-MOS is the main power switch, Q is the gate drive signal of the main power switch N-MOS, T is...

Claims

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Application Information

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IPC IPC(8): G01R19/25H02M3/335
CPCG01R19/25H02M3/335Y02B70/10
Inventor 符威刘洋
Owner MORNSUN GUANGZHOU SCI & TECH
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