JPS5660460A - High voltage generating circuit - Google Patents
High voltage generating circuitInfo
- Publication number
- JPS5660460A JPS5660460A JP13682879A JP13682879A JPS5660460A JP S5660460 A JPS5660460 A JP S5660460A JP 13682879 A JP13682879 A JP 13682879A JP 13682879 A JP13682879 A JP 13682879A JP S5660460 A JPS5660460 A JP S5660460A
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- voltage
- turned
- circuit
- time constant
- 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.)
- Granted
Links
Landscapes
- Control Or Security For Electrophotography (AREA)
- Dc-Dc Converters (AREA)
Abstract
PURPOSE: To stop the oscillation operation of the inverter to prevent the damage of circuit elements when high-voltage discharge pulses are generated continuously in the secondary-side circuit, by connecting a resistance in parallel to the capacitor to constitute a time constant circuit for discharge.
CONSTITUTION: When the generation interval of high-voltage discharge pulses is larger than the time constant determined by capacitor 23 and resistance 29, switching transistor 24 is not turned on, and therefore, the oscillation operation continues still. When the generation interval of high-voltage discharge pulses is smaller than the time constant, the charging quantity of capacitor 23 is increased gradually; and if the voltage dependent upon this increment reaches the sum of the breakdown voltage of Zener diode 30 and the voltage between the base and the emitter which makes switching trasistor 24 turned on, charged electric charge of capacitor 23 forms the base current of transistor 24 at a time. Therefore, transistor is turned on from the turning-on state to stop oscillation of oscillating circuit 31, so that damage of circuit elements can be prevented.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54136828A JPS6014582B2 (en) | 1979-10-22 | 1979-10-22 | High voltage generation circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54136828A JPS6014582B2 (en) | 1979-10-22 | 1979-10-22 | High voltage generation circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5660460A true JPS5660460A (en) | 1981-05-25 |
JPS6014582B2 JPS6014582B2 (en) | 1985-04-15 |
Family
ID=15184445
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP54136828A Expired JPS6014582B2 (en) | 1979-10-22 | 1979-10-22 | High voltage generation circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6014582B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7800180B2 (en) * | 2006-06-29 | 2010-09-21 | Mitsumi Electric Co., Ltd. | Semiconductor electrostatic protection device |
-
1979
- 1979-10-22 JP JP54136828A patent/JPS6014582B2/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7800180B2 (en) * | 2006-06-29 | 2010-09-21 | Mitsumi Electric Co., Ltd. | Semiconductor electrostatic protection device |
Also Published As
Publication number | Publication date |
---|---|
JPS6014582B2 (en) | 1985-04-15 |
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