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A Dynamic Compensation Circuit Applicable to Current Mode PWM Controller

A technology of dynamic compensation and controller, applied in the direction of electrical components, output power conversion devices, etc., can solve the problems of large loss in the compensation mode of the current-type PWM control circuit, etc., and achieve fast response of over-current protection, sensitive over-current protection function, The effect of reducing loss

Active Publication Date: 2019-05-10
TIANSHUI 749 ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem of large loss in the compensation mode of the current-type PWM control circuit under the application range of high-voltage and high-power, the present invention proposes a dynamic compensation circuit suitable for the current-type PWM controller

Method used

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  • A Dynamic Compensation Circuit Applicable to Current Mode PWM Controller
  • A Dynamic Compensation Circuit Applicable to Current Mode PWM Controller
  • A Dynamic Compensation Circuit Applicable to Current Mode PWM Controller

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Embodiment Construction

[0013] Such as Figure 6 shown, according to Figure 6 The circuit diagram given in , describes the circuit connection relationship between the following components, including the drive pin of the PWM control circuit and the current detection terminal of the PWM control circuit. The drive pin of the PWM control circuit is connected to one end of the resistor R1 and resistor R5 respectively. The other end of the resistor R1 is connected to one end of the resistor R2 and the gate of the switch tube T1, and the other end of the resistor R2 is grounded; the drain of the switch tube T1 is connected to one end of the primary winding of the transformer BT1, and the primary winding of the transformer BT1 The other end is connected to the input terminal +Vin; the source of the switch tube T1 is respectively connected to one end of the resistor R4, one end of the resistor R3, and the cathode of the diode D1; the anode of the diode D1 is connected to the other end of the resistor R5, and...

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Abstract

The invention discloses a dynamic compensation circuit suitable for a current-type PWM controller. The driving pins of the PWM control circuit are respectively connected to one end of R1 and R5, and the other end of R1 is respectively connected to one end of R2 and the grid of a switching tube T1. R2 The other end is grounded; the drain of the switching tube T1 is connected to one end of the primary winding of the transformer BT1, and the other end of the primary winding of BT1 is connected to the input terminal +Vin; the source of T1 is respectively connected to one end of the resistor R4, one end of the resistor R3, and the cathode of the diode D1; The anode of the diode D1 is connected to the other end of the resistor R5, and the other end of the resistor R4 is grounded; the current detection end of the PWM control circuit is connected to one end of the resistor R3 and the anode of the diode D2, and the cathode of the diode D2 is respectively connected to one end of the resistor R6 and one end of the capacitor C2. The other end of the resistor R6 and the capacitor C2 is grounded. The invention effectively reduces the loss of the compensation resistor, and the overcurrent protection function of the power supply module is more sensitive, so that the PWM current type working mode is more suitable for high-voltage input and high-power DC / DC power supply modules.

Description

technical field [0001] The invention belongs to the field of electronic circuits and relates to a high-voltage input DC / DC power supply, in particular to a dynamic compensation circuit suitable for a current-type PWM controller. Background technique [0002] At present, the high-voltage input DC / DC power supply mostly adopts PWM current-type control mode. The advantages of the current-mode control method are: high bandwidth, fast transient closed-loop response, and fast response to transient changes in input voltage and output load. But the disadvantage is that the current loop usually uses positive feedback compensation at the input end. When it is applied to high-power design, due to insufficient compensation under light load, the loop operation will be unstable and the output waveform will oscillate. At the same time, the compensation network itself has a certain power consumption, and it will increase with the increase of the input voltage. It is also not conducive to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/08
CPCH02M1/08H02M1/0016
Inventor 韩苏林丁旭
Owner TIANSHUI 749 ELECTRONICS
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