Self-powered circuit applied to switching circuit

A switching circuit, self-powered technology, applied in the direction of converting irreversible AC power input to DC power output, etc., can solve the problems of reduced chip efficiency, increased application cost, large transformer volume, etc., to achieve a simple structure, avoid the use of high-voltage devices, The effect of energy self-harvesting

Inactive Publication Date: 2016-09-07
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method requires a larger transformer volume and increases the overall application cost
In addition, the energy of thes...

Method used

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  • Self-powered circuit applied to switching circuit
  • Self-powered circuit applied to switching circuit
  • Self-powered circuit applied to switching circuit

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Embodiment Construction

[0011] The present invention is described in detail below in conjunction with accompanying drawing:

[0012] The system schematic diagram of the present invention is as figure 1 shown. When the power tube is switched on and off, the voltage at the drain end of the power tube will change with time. By detecting the dv / dt of the drain end when the power tube is turned off, the current required for the system power supply is collected, and then through the rectification and dynamic current matching clamp module to achieve stability. voltage supply. The following will combine the circuit to analyze the system in detail.

[0013] The topological structure diagram of the present invention is as figure 2 As shown, it includes operational amplifier, power tube M0, first voltage dividing resistor R1, second voltage dividing resistor R2, load current source ILoad, first capacitor C1, second capacitor C2, first diode D1, second D2 ; The negative phase input terminal of the operation...

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PUM

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Abstract

The invention belongs to the technical field of electronic circuits, and particularly relates to a self-powered circuit applied to a switching circuit. The self-powered circuit comprises an operational amplifier, a power tube M0, a first divider resistor R1, a second divider resistor R2, a load current source ILoad, a first capacitor C1, a second capacitor C2, a first diode D1 and a second diode D2, wherein a negative-phase input end of the operational amplifier is connected with a reference voltage; an output end of the operational amplifier is connected with a grid electrode of the power tube M0; a drain electrode of the power tube M0 is connected with a power supply; a source electrode of the powder tube M0 is grounded; a positive-phase input end of the operational amplifier is connected with the first divider resistor R1; the first divider resistor R1 is connected with the drain electrode of the power tube M0; the second divider resistor R2 is grounded; the drain electrode of the power tube M0 is connected with a negative electrode of the first diode D1; a positive electrode of the second diode D2 is grounded; and a positive electrode of the first diode D1 is connected with a drain electrode voltage of the power tube M0. The self-powered circuit has the advantages of simple framework, self-collection of energy, high overall system efficiency, avoidance of use of high-voltage devices, and low cost.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and in particular relates to a self-supply circuit for switching circuits. Background technique [0002] In high-voltage power conversion circuits, such as Flyback and Buck topology circuits, the switching of the power switching tube is controlled by a feedback signal to achieve energy transfer. There are usually two ways to supply power to the control part of the chip: 1. Directly obtain DC voltage from the main power supply to supply power to the IC. This method usually requires more high-voltage devices, which reduces the integration of the chip. 2. Using the auxiliary winding, the output voltage is used to supply power to the chip through the transformer principle. However, this method requires a larger transformer volume and increases the overall application cost. In addition, the energy of these two methods comes from the general power supply, which needs to consume additiona...

Claims

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Application Information

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IPC IPC(8): H02M7/04
CPCH02M7/04
Inventor 周泽坤董瑞凯张家豪石跃王卓张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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