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Self-adaptive soft drive control circuit

A control circuit and soft drive technology, which is applied in the direction of control/regulation system, electrical components, and adjustment of electrical variables, can solve problems such as poor EMI characteristics and large current peaks, and achieve the effect of simple control loop structure and improved EMI characteristics

Active Publication Date: 2021-04-30
NANJING MICRO ONE ELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an adaptive soft drive control circuit, which has the advantage of realizing the self-adaptive adjustment of the flyback primary side MOS drive, and solves the instantaneous current peak of the switch caused by the excessive driving speed of the primary side in the ACDC system. Large, poor EMI characteristics

Method used

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Embodiment Construction

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0029] refer to Figure 1-7 , an adaptive soft drive control circuit, including a basic circuit, the basic circuit is connected with an external power MOS, and is characterized in that it also includes the driving speed detection circuit and a dynamic adjustment circuit, and the driving speed detection circuit and the dynamic adjustment circuit The circuit is connected, and the dynamic adjustment circuit is connected with the external power MOS;

[0030] The ...

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Abstract

The invention discloses a self-adaptive soft drive control circuit, which comprises a basic circuit connected with an external power MOS; the self-adaptive soft drive control circuit is characterized by further comprising a drive speed detection circuit and a dynamic adjustment circuit which are connected with each other; and the dynamic adjustment circuit is connected with an external power MOS gate pole. The voltage peak of the CS pin outside the chip is detected to directly sample the current peak at the moment when the external power switch is turned on, the control loop is simple in structure, the stability problem caused by common closed-loop adjustment does not exist, the adjustment precision is high, and the adjustment of the self-adaptive adjustment end point is achieved only by adding one port to be externally connected with a ground resistor.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to an adaptive soft drive control circuit. Background technique [0002] Flyback circuits such as figure 1 , the primary side NP0 of TR0 of the transformer is connected to the primary circuit, the input voltage Vin0 is input to the primary circuit, the primary uses the input voltage to realize the energy storage of the excitation inductance, and transmits it to the secondary, and the diode D01 of the secondary measuring NS0 flows through the output current Iout1 and Iout1 charge the capacitor C01 and provide energy to the load. [0003] In order to achieve the optimum efficiency of the switching power supply, the quasi-resonant control mode is usually used, at this time the whole system works in the discontinuous mode (DCM), figure 2 The flyback topology working under DCM is given. When the voltage VO1 on the secondary output capacitor C11 is lower than the rated output vo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M1/44H02M1/32
CPCH02M3/33592H02M1/44H02M1/32
Inventor 鲁扬张洪俞黎敏霞
Owner NANJING MICRO ONE ELECTRONICS
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