JPS6450111A - Overvoltage detecting circuit - Google Patents
Overvoltage detecting circuitInfo
- Publication number
- JPS6450111A JPS6450111A JP20517387A JP20517387A JPS6450111A JP S6450111 A JPS6450111 A JP S6450111A JP 20517387 A JP20517387 A JP 20517387A JP 20517387 A JP20517387 A JP 20517387A JP S6450111 A JPS6450111 A JP S6450111A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- overvoltage
- terminal
- output
- varied
- 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
- Control Of Voltage And Current In General (AREA)
Abstract
PURPOSE:To vary an overvoltage detecting point in accordance with a voltage variation of a variable type stabilized power source, and to execute an optimum overvoltage detection, by providing a voltage comparing circuit, etc., and setting an overvoltage detecting voltage against an output voltage by a voltage ratio of first and second reference voltages. CONSTITUTION:To one terminal of a voltage comparing circuit 6, a voltage of a divided voltage input terminal 2 is inputted, and to the other input terminal, a voltage VP of the second reference voltage 7 is inputted, a voltage of the terminal 2 and the voltage VP are compared, and a voltage corresponding to its result is outputted from an output terminal 8. Subsequently, the first reference voltage VR and the voltage VP are set to VP/VR=b>1, that is, VP is set higher than the voltage VR. Accordingly, even if a voltage dividing ratio 1/a of a variable type voltage dividing circuit 4 is set to any value, an overvoltage is detected at the time of exceeding (b) times (b>1) of an output voltage Vout in its stationary state, and an output voltage of the terminal 8 is varied to a correct value in accordance with the detection. In such a way, even if the output voltage is varied by a voltage control circuit 1, an overvoltage detecting point can be varied in accordance with its output voltage, and an optimum overvoltage detection which can protect enough a load circuit can be executed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20517387A JPS6450111A (en) | 1987-08-20 | 1987-08-20 | Overvoltage detecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20517387A JPS6450111A (en) | 1987-08-20 | 1987-08-20 | Overvoltage detecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6450111A true JPS6450111A (en) | 1989-02-27 |
Family
ID=16502631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20517387A Pending JPS6450111A (en) | 1987-08-20 | 1987-08-20 | Overvoltage detecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6450111A (en) |
-
1987
- 1987-08-20 JP JP20517387A patent/JPS6450111A/en active Pending
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