JP2000014140A5

JP2000014140A5 -

Info

Publication number: JP2000014140A5
Application number: JP1998176084A
Authority: JP
Filing date: 1998-06-23
Publication date: 2005-04-07
Anticipated expiration: 2018-06-23

Description

【０００７】
【課題を解決するための手段】
本発明は、接地電位を基準として電力供給を行う電源と、
電源から供給される電力を直流電力に変換するスイッチング電源回路であって、
１次側巻線および２次側巻線が電気的に絶縁されるスイッチングトランスと、
該電源から供給される電力を基に、スイッチングトランスの１次側巻線をスイッチング駆動するスイッチング回路と、
スイッチングトランスの２次側巻線に発生するスイッチング出力を、接地電位を基準として整流し、平滑して直流電力を出力する整流平滑回路とを備えるスイッチング電源回路と、
信号源から発生され、負荷を駆動制御する信号が入力され、該整流平滑回路から出力される直流電力を基に、該信号に応じて該負荷を駆動する負荷駆動回路と、
該スイッチング電源回路の整流平滑回路の基準電位側と該信号源の基準電位側出力との間の接地経路に流れる電流を検知する電流検知素子と、
該電流検知素子が検知する電流が予め定める基準を超えるとき、該負荷駆動回路が該負荷を駆動する出力電流を抑制する保護手段とを含むことを特徴とする負荷駆動回路の保護装置である。 [0007]
[Means for Solving the Problems]
According to the present invention, there is provided a power supply for supplying power based on ground potential.
A switching power supply circuit for converting power supplied from a power supply into DC power, comprising:
A switching transformer in which the primary winding and the secondary winding are electrically isolated;
A switching circuit for switching and driving a primary winding of a switching transformer based on power supplied from the power supply;
A switching power supply circuit comprising: a rectification smoothing circuit which rectifies and smoothes a switching output generated in a secondary winding of a switching transformer with reference to a ground potential and outputs DC power;
A load drive circuit which is generated from a signal source and receives a signal for driving and controlling a load, and drives the load according to the signal based on DC power output from the rectifying and smoothing circuit;
A current detection element for detecting a current flowing in a ground path between a reference potential side of a rectification smoothing circuit of the switching power supply circuit and a reference potential side output of the signal source;
And a protection device for the load drive circuit, the load drive circuit including: protection means for suppressing an output current for driving the load when the current detected by the current detection element exceeds a predetermined reference.

Claims

A power supply that supplies power based on the ground potential;
A switching power supply circuit for converting power supplied from a power supply into DC power, comprising:
A switching transformer in which the primary winding and the secondary winding are electrically isolated;
A switching circuit for switching and driving a primary winding of a switching transformer based on power supplied from the power supply;
A switching power supply circuit comprising: a rectifying and smoothing circuit that rectifies and smoothes a switching output generated in a secondary winding of a switching transformer with reference to a ground potential and outputs DC power;
A load drive circuit which is generated from a signal source and receives a signal for driving and controlling a load, and drives the load according to the signal based on DC power output from the rectifying and smoothing circuit;
A current detection element for detecting a current flowing in a ground path between a reference potential side of a rectification smoothing circuit of the switching power supply circuit and a reference potential side output of the signal source;
A protection device for a load drive circuit, comprising: protection means for suppressing an output current for driving the load when the current detected by the current detection element exceeds a predetermined reference.