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A soft start circuit and soft start method for isolating dc-dc power chip

A soft-start circuit, DC-DC technology, applied in the direction of electrical components, regulating electrical variables, output power conversion devices, etc., can solve problems such as startup overshoot, failure to start, isolated DC-DC power chips without soft-start circuits, etc. , to achieve the effect of improving reliability

Active Publication Date: 2021-06-04
SHANGHAI CHIPANALOG MICROELECTRONICS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing isolated DC-DC power chip does not have a soft-start circuit, which causes abnormal working states such as failure to start and start-up overshoot during the start-up process of the isolated DC-DC power chip.

Method used

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  • A soft start circuit and soft start method for isolating dc-dc power chip
  • A soft start circuit and soft start method for isolating dc-dc power chip
  • A soft start circuit and soft start method for isolating dc-dc power chip

Examples

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Embodiment 1

[0033] Such as image 3 As shown, a soft-start circuit for isolating a DC-DC power supply chip. In this embodiment, the soft-start circuit includes a primary-side soft-start circuit, and the primary-side soft-start circuit includes a controller (PWM_SS) 01 electrically connected in sequence. , oscillator (OSC) 02, isolation inductor 21, power rectifier (REC) 11. The primary-side soft-start circuit is used to control the initial start-up of the isolated DC-DC power supply chip, and output the secondary-side power supply voltage (Viso) after being rectified by the power rectifier (REC) 11 until the secondary-side power supply voltage (Viso) is equal to the undervoltage protection threshold.

[0034] Such as image 3As shown, the soft start circuit also includes a feedback circuit, and the feedback circuit includes an undervoltage protection comparator (UVLO) 12, an edge pulse generator (Pulse Gen) 13, a logic operator (OR or logic) 14, and a signal modulation Device 15, isolat...

Embodiment 2

[0043] This embodiment provides a soft-start method for isolating a DC-DC power supply chip. The soft-start circuit applied in Embodiment 1 to soft-start the isolated DC-DC power supply chip includes the following steps:

[0044] Step 1. Before the isolated DC-DC power supply chip is started, the secondary side power supply voltage (Viso) is equal to zero; the isolated DC-DC power supply chip is started, and the primary side soft-start circuit operates, and the controller (PWM_SS) 01 drives the oscillator (OSC) 02, Generate electromagnetic waves, provide electric energy for the secondary side of the isolated DC-DC power supply chip through the isolation inductor, and output the secondary side power supply voltage (Viso) after being rectified by the power rectifier (REC) 11;

[0045] Step 2. The undervoltage protection comparator (UVLO) 12 of the feedback circuit detects and compares the secondary power supply voltage (Viso) with the undervoltage protection threshold. When the s...

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Abstract

The present invention provides a soft start circuit for isolating a DC-DC power supply chip, which includes a primary side soft start circuit, and the primary side soft start circuit includes a controller, an oscillator, an isolation inductor, and a power rectifier that are electrically connected in sequence. The soft start circuit also includes a feedback circuit, and the feedback circuit includes an undervoltage protection comparator, an edge pulse generator, a logic operator, a signal modulator, an isolation capacitor, and a signal demodulator electrically connected in sequence. The input terminal of the undervoltage protection comparator is electrically connected to the secondary power supply voltage, and the output terminal of the signal demodulator is electrically connected to the controller. The undervoltage protection comparator is used to detect and compare the secondary power supply voltage and the undervoltage protection threshold, and to The controller outputs or does not output short pulses to control the work of the soft-start circuit on the primary side. The structure of the above soft-start circuit can ensure that the isolated DC-DC power supply chip will not generate overshoot during the soft-start process, thereby improving the reliability of the system.

Description

technical field [0001] The invention relates to the technical field of power circuits, in particular to a soft start circuit and a soft start method for isolating DC-DC power supply chips. Background technique [0002] Power chips are mainly used for power conversion and are widely used in various electronic devices. The quality of power chips directly affects the operation of electronic devices. At present, power chips are in the direction of light, small, thin, low noise, high reliability, and anti-interference develop. The soft start of the power chip is to slowly increase the voltage from zero to the rated voltage, so that the starting current during the startup process of the device is changed from uncontrollable overload current to controllable. And the size of the starting current can be adjusted as needed. There is no impact torque in the whole process of starting the motor, but a smooth start operation, which is soft start. [0003] At present, the existing isola...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/36H02M1/32H02M3/335
CPCH02M1/32H02M1/36H02M3/33523
Inventor 史广达
Owner SHANGHAI CHIPANALOG MICROELECTRONICS LTD