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Current trigger circuit and switch type power converter applying same

A technology of power converter and trigger circuit, which is applied in electric pulse generator circuit, output power conversion device, conversion of DC power input to DC power output, etc., can solve the conversion efficiency deterioration of DC to DC step-down conversion circuit, etc. question

Inactive Publication Date: 2013-03-27
GREEN SOLUTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the current trend of low-voltage working voltage of electronic components, and the limitation of the voltage difference across the detection resistor Ri, the conversion efficiency of the DC-to-DC step-down conversion circuit is relatively poor.
How to provide a more efficient detection circuit is an unavoidable topic in the current trend of lower working voltage

Method used

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  • Current trigger circuit and switch type power converter applying same
  • Current trigger circuit and switch type power converter applying same
  • Current trigger circuit and switch type power converter applying same

Examples

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Embodiment Construction

[0078] Please refer to figure 2It is a schematic circuit diagram of a current trigger circuit according to the present invention. The conversion circuit CONVERTER has a detection resistor R through which a current I flows. A bias unit BIAS has a first detection terminal and a second detection terminal respectively coupled to both ends of the detection resistor R, and provides a bias voltage at one of the first detection terminal and the second detection terminal dV. The trigger unit DET is coupled to the bias voltage unit BIAS. When the cross-voltage I*R of the resistor rises higher than the bias voltage dV, the trigger unit DET generates a high-level current trigger signal Itr. Since the circuit noise interference of the first detection terminal and the second detection terminal coupled to the trigger unit DET will cancel each other out, the current detection can be almost not affected by noise, so that the circuit has excellent anti-noise ability, and It can also reduce ...

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Abstract

The invention discloses a current trigger circuit and a switch type power converter applying the same. A voltage bias is compared with a voltage difference on a detecting element. A voltage bias generator and the detecting element are connected with a common potential to avoid noise on a circuit, thereby avoiding circuit misjudgement caused by circuit noise jamming. Therefore, the invention can use detecting elements with low resistance value, such as metal oxide semiconductor transistors, thereby reducing power loss generated by the detecting current and enhancing the conversion efficiency of the circuit.

Description

technical field [0001] The invention relates to a switch-type power converter and a current trigger circuit, in particular to a switch-type power converter and a current trigger circuit which use bias voltage to detect current. Background technique [0002] Please refer to figure 1 , is a schematic circuit diagram of a conventional DC-to-DC step-down conversion circuit for converting an input voltage VIN into an output voltage VOUT. The DC-to-DC step-down conversion circuit includes a switch SW, an inductor L, a capacitor C, a diode D, a detection resistor Ri and a controller CON. The switching switch SW is switched according to a control signal CONTROL generated by the controller CON to control the power delivered by the input voltage VIN. When the switch SW is turned on, the inductor current IL flows through the inductor L and is stored in the capacitor C. When the switch SW is turned off, the power stored in the inductor L is transferred to the capacitor C through the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/00H03K3/02
Inventor 陈继明简焕文
Owner GREEN SOLUTION TECH CO LTD