JPS5846297U

JPS5846297U - Drive element damage prevention circuit

Info

Publication number: JPS5846297U
Application number: JP1981140769U
Authority: JP
Inventors: 寺神戸　清昭
Original assignee: ティー・シー・エム株式会社
Priority date: 1981-09-22
Filing date: 1981-09-22
Publication date: 1983-03-29

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図および第２図は従来例を示し、第１図は回路図、
第２図は第１図の回路の入力信号および駆動用トランジ
スタのエミッタ・ベース間に加わる電圧を示すタイムチ
ャート、第３図および第１゜図はこの考案の実施例を示
し第３図は回路図、第４図は第３−図の回路の入力信号
および駆動用トランジスタのエミッタ・ベース間に加わ
る電圧を示すタイムチャートである。１．２・・−ｉ動用トランジスタ、１１．１２・・・ス
イッチング・トランジスタ、９・・・電源、１０・・・
モータ。Figures 1 and 2 show a conventional example; Figure 1 is a circuit diagram;
Fig. 2 is a time chart showing the input signal of the circuit of Fig. 1 and the voltage applied between the emitter and base of the driving transistor, Fig. 3 and Fig. 1 show an embodiment of this invention, and Fig. 3 shows the circuit FIG. 4 is a time chart showing the input signal of the circuit of FIG. 3 and the voltage applied between the emitter and base of the driving transistor. 1.2...-i active transistor, 11.12... switching transistor, 9... power supply, 10...
motor.

Claims

[Scope of utility model registration request]

(1) In a circuit where a drive element connected in series with a load is controlled to repeat on and off at a required period, a switching element is connected between both terminals of the load, and switching element 4 is used when the drive element is turned off. A drive element damage prevention circuit that is controlled to turn on when .

(2) The driving elements are two forward rotation drive transistors and two reverse rotation drive transistors, and two switching elements are provided, and the first normal rotation drive transistor and the first reverse rotation drive transistor are connected in series. a driving transistor;
A second reverse drive transistor and a second forward drive transistor connected in series are connected in parallel to the power supply, and a connection point between the first forward drive transistor and the first reverse drive transistor is connected in parallel to the power supply. , a motor is connected between the connection point of the second reverse drive transistor and the second forward drive transistor, and the first reverse drive transistor has a first switching element and a cathode connected to the positive side of the power supply. According to a utility model registration claim, the first diode is connected in parallel to the second forward drive transistor, the second switching element, and the second diode are connected in parallel so that the cathode is on the positive side of the power supply. A damage prevention circuit for a drive element according to scope 1.