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Control method of isolated power supply based on non-isolated power supply chip

A power chip and power isolation technology, applied in control/regulation systems, electrical components, regulating electrical variables, etc., which can solve the problems of troublesome selection of power control chips and few types of isolated power control chips, and increase the selection range. Effect

Inactive Publication Date: 2016-08-31
FUJIAN STAR NET WISDOM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, there are non-isolated power supply control chips and isolated power supply control chips on the market. In different power supply occasions, different power supply topologies need to be used; the existing technology can complete the use of non-isolated power supply control chips for non-isolated power supply design, and can also complete the use of The isolated power supply control chip is designed for isolated power supply, but because there are few types of isolated power supply control chips, it causes a certain degree of trouble to the selection of power supply control chip for isolated power supply design

Method used

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  • Control method of isolated power supply based on non-isolated power supply chip
  • Control method of isolated power supply based on non-isolated power supply chip
  • Control method of isolated power supply based on non-isolated power supply chip

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Embodiment Construction

[0016] like Figure 1 to Figure 3 As shown, the present invention is based on the control method of the isolated power supply of the non-isolated power supply chip, and the method includes: a coupling inductor, a switch Q1, a diode CR1, a capacitor C and a resistor R; including the following steps:

[0017] Step 1. Turn on the power supply VI, and load the voltage to the main coil L of the coupled inductor PRI In the process, the energy is stored until the power switch Q1 is turned off; the power supply VI drives the non-isolated power supply chip through the drive circuit;

[0018] Step 2. From the secondary coil L of the coupled inductor SEC , the voltage is transmitted to the output capacitor C and the load resistor R through the output diode CR1;

[0019] Step 3. Divide the output voltage VO through two resistors, and compare it with the reference voltage V in the error amplifier. ref comparison, after which the error amplifier outputs the corresponding input voltage V ...

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Abstract

The invention provides a control method of an isolated power supply based on a non-isolated power supply chip, comprising: connecting with a power supply VI, loading a voltage to the main coil LPRI of a coupling conductor, and storing energy until a power switch Q1 is turned off; from the secondary coil LSEC of the coupling conductor, transmitting the voltage to an output capacitor C and a load resistor R through an output diode CR1; processing an output voltage VO, comparing the voltage with the reference voltage Vref in an error amplifier, and then the error amplifier outputting a corresponding input voltage VE to a non-isolated power supply control chip; and the non-isolated power supply control chip performing corresponding adjustment on a duty ratio through the output voltage VE of the error amplifier, thereby controlling energy storage in the main coil LPRI of the coupling conductor, completing output voltage VO control, and substantially enlarging the chip type selecting range of isolated power supply design.

Description

technical field [0001] The invention relates to a control method of an isolated power supply based on a non-isolated power supply chip. Background technique [0002] At present, there are non-isolated power supply control chips and isolated power supply control chips on the market. In different power supply occasions, different power supply topologies need to be used; the existing technology can complete the use of non-isolated power supply control chips for non-isolated power supply design, and can also complete the use of The isolated power supply control chip is designed for isolated power supply, but because there are few types of isolated power supply control chips, it causes a certain degree of trouble to the selection of power control chip for isolated power supply design. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a control method of an isolated power supply based on a non-isolated power supply chip,...

Claims

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/33523H02M1/0025
Inventor 高计丰蔡鸿东
Owner FUJIAN STAR NET WISDOM TECH CO LTD
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