JPS5478423A - Voltage detection circuit - Google Patents
Voltage detection circuitInfo
- Publication number
- JPS5478423A JPS5478423A JP14587877A JP14587877A JPS5478423A JP S5478423 A JPS5478423 A JP S5478423A JP 14587877 A JP14587877 A JP 14587877A JP 14587877 A JP14587877 A JP 14587877A JP S5478423 A JPS5478423 A JP S5478423A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- diode
- remains
- damped
- capacitor
- 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
- Braking Systems And Boosters (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
PURPOSE: To operate an electrode brake despite the remaining of damped AC voltage, by detecting that the damped AC voltage reaches a predetermined level after a power switch for a motor is turned off.
CONSTITUTION: When the detected AC voltage is applied to input terminals IN, the terminal voltage of a resistor R2 and the base voltage of a transsistor T1 have wave forms as shown in Fig. Since the transistor T1 remains off before a time Tc, the terminal voltage of a capacitor C is higher than the Zener voltage of a constant voltage diode ZD2 and this diode remains on and supplies an output signal to output terminals OUT. Since the terminal voltage of the capacitor C is lower than the Zener voltage of the diode ZD2 after the time Tc, the diode remains off and supplies no output signal to the output terminals OUT. A predetermined level of increasing DC voltage can be detected on the ground of the state change of the diode ZD2.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14587877A JPS5478423A (en) | 1977-12-05 | 1977-12-05 | Voltage detection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14587877A JPS5478423A (en) | 1977-12-05 | 1977-12-05 | Voltage detection circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5478423A true JPS5478423A (en) | 1979-06-22 |
Family
ID=15395128
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14587877A Pending JPS5478423A (en) | 1977-12-05 | 1977-12-05 | Voltage detection circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5478423A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59221674A (en) * | 1983-05-31 | 1984-12-13 | Matsushita Electric Works Ltd | Frequency detecting circuit |
-
1977
- 1977-12-05 JP JP14587877A patent/JPS5478423A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59221674A (en) * | 1983-05-31 | 1984-12-13 | Matsushita Electric Works Ltd | Frequency detecting circuit |
JPH0588429B2 (en) * | 1983-05-31 | 1993-12-22 | Matsushita Electric Works Ltd |
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