JPH03120686U

JPH03120686U -

Info

Publication number: JPH03120686U
Application number: JP2882990U
Authority: JP
Priority date: 1990-03-20
Filing date: 1990-03-20
Publication date: 1991-12-11

Description

[Brief explanation of drawings]

第１図は本考案の一実施例を示す構成ブロツク
図、第２図は動作の一例を示すタイムチヤート、
第３図はインダクタンス素子に流れる合流電流の
平均値を求めるための図、第４図は出力電流Ｉｏ
と出力電圧Ｖｏｕｔの関係を示す図、第５図は従
来のチヨツパ電源装置の基本回路を示す構成ブロ
ツク図、第６図は第５図ａに示す降圧形の電源装
置に過負荷保護機能を持たせる場合、その過負荷
検出方式を示す構成ブロツク図、第７図は出力ラ
イン電流検出方式で、降圧形コンバータのより具
体的な構成ブロツク図、第８図は各チヨツパ電源
装置における過負荷検出の各方式による利害得失
を比較した図である。Ｑ１……スイツチ素子、Ｄ１……整流ダイオー
ド、Ｃ１……平滑コンデンサ、ＲＬ……負荷、１
……コントロール回路、１１……過電流保護アン
プ、１２……定電圧制御アンプ、１３……基準電
圧源、Ｌ１……インダクタンス素子、Ｒ１……電
流検出抵抗、Ｒ２，Ｃ２……ローパスフイルター
を構成する抵抗とコンデンサ。 Fig. 1 is a configuration block diagram showing one embodiment of the present invention, Fig. 2 is a time chart showing an example of operation,
Fig. 3 is a diagram for determining the average value of the combined current flowing through the inductance element, and Fig. 4 is a diagram for determining the average value of the combined current flowing through the inductance element.
Figure 5 is a configuration block diagram showing the basic circuit of a conventional chopper power supply, and Figure 6 is a step-down type power supply shown in Figure 5a with an overload protection function. Figure 7 shows the output line current detection method, a more specific configuration block diagram of the step-down converter, and Figure 8 shows the overload detection method in each chopper power supply. It is a diagram comparing the benefits and disadvantages of each method. Q1... Switch element, D1... Rectifier diode, C1... Smoothing capacitor, RL... Load, 1
... Control circuit, 11 ... Overcurrent protection amplifier, 12 ... Constant voltage control amplifier, 13 ... Reference voltage source, L1 ... Inductance element, R1 ... Current detection resistor, R2, C2 ... Consists of low-pass filter. resistor and capacitor.

Claims

[Claim for Utility Model Registration] A switch element connected to a line through which load current flows, a rectifier diode, a smoothing capacitor,
In a polarity inverting chopper power supply device, the voltage across the smoothing capacitor is supplied to a load, and the control circuit controls the on-time of the switch element so that the voltage becomes a constant voltage. A series circuit of an inductance element L and a current detection resistor R1 connected between a flowing output line and a ground line, a low-pass filter that averages the voltage generated across the current detection resistor, and an output signal of this low-pass filter is passed to the control circuit. circuit means for applying the voltage to the overcurrent protection amplifier, and the control circuit controls the on-time of the switch element to be shortened so that the output voltage of the low-pass filter becomes constant during overload. Chiyotsupa power supply.