JPS6477423A - Overcurrent protective circuit - Google Patents
Overcurrent protective circuitInfo
- Publication number
- JPS6477423A JPS6477423A JP23354187A JP23354187A JPS6477423A JP S6477423 A JPS6477423 A JP S6477423A JP 23354187 A JP23354187 A JP 23354187A JP 23354187 A JP23354187 A JP 23354187A JP S6477423 A JPS6477423 A JP S6477423A
- Authority
- JP
- Japan
- Prior art keywords
- current detection
- detection circuit
- circuit
- sent
- speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
PURPOSE:To cause an apparatus to have a protective function even at a stationary time by lowering the detection ratio or speed of response of a current detection circuit only while a signal is being sent to the circuit. CONSTITUTION:While an ON signal is sent from a controlling circuit 6a to a power source 1, the pulse signal of a constant length of time is sent to a current detection circuit 3a. While the pulse signal is being sent out, the speed of detection or response of the current detection circuit 3a is set at a value lower than that in a stationary state so as to be suited to speed characteristics at the beginning of voltage application. Therefore, the output signal level of the current detection circuit 3a is kept at a low value, even if a high rush current flows therethrough. When the pulse signal is out, the detection ratio or speed of response of the current detection circuit 3a is set at a value suited to a stationary state. Thus, the optimum protection characteristics can be obtained even at a stationary time, because a pulse signal is sent out for a certain period of time in case of voltage application so as to vary the characteristics of the current detection circuit 3a or the output value of the reference signal generator circuit 4.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23354187A JPS6477423A (en) | 1987-09-17 | 1987-09-17 | Overcurrent protective circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23354187A JPS6477423A (en) | 1987-09-17 | 1987-09-17 | Overcurrent protective circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6477423A true JPS6477423A (en) | 1989-03-23 |
Family
ID=16956668
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23354187A Pending JPS6477423A (en) | 1987-09-17 | 1987-09-17 | Overcurrent protective circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6477423A (en) |
-
1987
- 1987-09-17 JP JP23354187A patent/JPS6477423A/en active Pending
Similar Documents
Publication | Publication Date | Title |
---|---|---|
KR920005205A (en) | Overcurrent trip circuit | |
JPS57124946A (en) | Pulse detection circuit | |
JPS6477423A (en) | Overcurrent protective circuit | |
JPS538910A (en) | Electric rolling stock controlling device | |
JPS57103522A (en) | Power supply device | |
JPS5398050A (en) | Power supply | |
SU843076A1 (en) | Device for protecting shaft traction dc network | |
JPS55103079A (en) | Switching regulator | |
JPS52140820A (en) | Shunt motor control system | |
JPS56159716A (en) | Direct-current electric power device | |
JPS5479442A (en) | Starting system of static type reactive power regulating device | |
JPS52146160A (en) | Timing circuit | |
JPS57100520A (en) | Memory power supply circuit | |
JPS5449548A (en) | Method of protecting induction motor | |
JPS52120353A (en) | Protective device for dc power transmission system | |
JPS53131447A (en) | Control of power invertor in use for power trfnsmission | |
JPS5752926A (en) | Constant voltage control circuit providing overcurrent protective function | |
JPS6412824A (en) | Output variation system for inverse voltage detection of dispersed power source | |
JPS5292327A (en) | Suspension system for converter | |
JPS55160904A (en) | Method and device for controlling dc compound motor for electric rolling stock | |
JPS5570486A (en) | Resistance welding current monitor device | |
JPS5736072A (en) | Pulse arc welding device | |
JPS54158635A (en) | Controller for power converter | |
JPS5482150A (en) | Transistor protecting circuit | |
JPS57170087A (en) | Overcurrent disconnecting circuit for dc motor |