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A primary winding resonant valley sampling circuit and sampling method

A primary winding and sampling circuit technology, applied in electrical components, adjusting electrical variables, high-efficiency power electronic conversion, etc., can solve the problems that the technical solution cannot meet this requirement, increase the volume of the transformer, and increase the cost.

Active Publication Date: 2021-06-08
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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  • A primary winding resonant valley sampling circuit and sampling method
  • A primary winding resonant valley sampling circuit and sampling method
  • A primary winding resonant valley 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. Collector of transistor T1 and 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 shown ...

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Abstract

The present invention is suitable for flyback converters, especially for transformer primary side resonant valley sampling circuits in quasi-resonant working mode or discontinuous working mode. The sampling current related to the difference between the resonant voltage and the input voltage Vin is obtained. The sampling current passes through the current-to-voltage conversion circuit to obtain a sampling voltage in a certain voltage domain. The sampling voltage then passes through the voltage domain conversion circuit to output a valley sampling signal, and the valley sampling The signal is in the same phase as the resonance signal, that is, the valley sampling signal is at low level when the resonance is at a valley, and the valley sampling signal is at a high level when the resonance is at a peak. Sampling This technical solution has a simple structure, can complete the resonance valley sampling of the primary winding, reduce the conduction loss of the converter, reduce the energy of electromagnetic interference, reduce the volume of the converter and the use of discrete devices, and reduce the cost.

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