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Flyback power supply circuit and its primary side control circuit

A technology of power supply circuit and control circuit, applied in the direction of control/regulation system, electrical components, regulating electrical variables, etc., can solve the problems of increasing cost and circuit size, etc.

Active Publication Date: 2020-11-03
RICHTEK TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] figure 1 The disadvantage of the prior art shown in is that a dedicated pin ASU is required to control the high-voltage startup switch SSU, which will increase the cost and the size of the circuit

Method used

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  • Flyback power supply circuit and its primary side control circuit
  • Flyback power supply circuit and its primary side control circuit
  • Flyback power supply circuit and its primary side control circuit

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Embodiment Construction

[0071] The drawings in the present invention are all schematic, mainly intended to show the coupling relationship between various circuits, and the relationship between various signal waveforms. As for the circuits, signal waveforms and frequencies, they are not drawn to scale.

[0072] see Figure 2A , shown in the figure is an embodiment of the flyback power supply circuit of the present invention (flyback power supply circuit 2A), the flyback power supply circuit 2A includes a transformer 10, a primary side switch N1, and a high voltage start switch SSU , the protection sensing circuit 50 , and the primary side control circuit 30 . The transformer 10 has a primary winding W1, a secondary winding W2, and an auxiliary winding WA, wherein the primary winding W1 is used to receive an input voltage VIN, the secondary winding W2 is used to generate an output voltage VOUT, and the auxiliary winding WA is used for To generate the controller supply voltage VDD, in one embodiment, t...

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PUM

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Abstract

The invention relates to a flyback power supply circuit and its primary side control circuit. A flyback power conversion circuit comprising: a transformer having a primary winding for receiving an input voltage; a secondary winding for generating an output voltage; and an auxiliary winding for generating a supply voltage; a primary switch coupled to the primary winding; a high voltage start The switch is electrically coupled between the input voltage and the supply voltage; and the primary side control circuit uses the supply voltage as a power supply, including: the shared pin is coupled to the control terminal of the high voltage start switch; the high voltage start circuit, when the controller supply voltage is not When a threshold value is exceeded, the high-voltage start switch is controlled to be turned on through the shared pin; and the protection control circuit is coupled to the protection sensing signal through the shared pin, and the protection control circuit operates the flyback power supply circuit according to the protection sensing signal .

Description

technical field [0001] The invention relates to a flyback power supply circuit and its primary side control circuit. The flyback power supply circuit particularly refers to a flyback power supply circuit that performs multiple functions with shared pins. The present invention also relates to a primary-side control circuit used in a flyback power supply circuit. Background technique [0002] The previous cases related to this case include: US patent application US 2017 / 0005583 A1 and Chinese patent application CN106329961 A. [0003] figure 1 A prior art flyback power supply circuit (flyback power supply circuit 1) is shown, wherein the flyback power supply circuit 1 includes a transformer 10, a primary side switch N1, and a primary side control circuit 30, and a high voltage starting Switch SSUs. The auxiliary winding WA is used to generate the controller supply voltage VDD as the power supply of the primary side control circuit 30. In addition, in the power start-up pha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M1/36H02M1/32
CPCH02M1/32H02M1/36H02M3/33523H02M1/327
Inventor 林昆馀
Owner RICHTEK TECH