TW341746B - Protection circuit for electric ballast (addition one) - Google Patents

Protection circuit for electric ballast (addition one)

Info

Publication number
TW341746B
TW341746B TW084108584A01A TW084108584A01A TW341746B TW 341746 B TW341746 B TW 341746B TW 084108584A01 A TW084108584A01 A TW 084108584A01A TW 084108584A01 A TW084108584A01 A TW 084108584A01A TW 341746 B TW341746 B TW 341746B
Authority
TW
Taiwan
Prior art keywords
resistor
transistor
voltage
collector
emitter
Prior art date
Application number
TW084108584A01A
Other languages
Chinese (zh)
Inventor
zhao-zheng Lu
Original Assignee
zhao-zheng Lu
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by zhao-zheng Lu filed Critical zhao-zheng Lu
Priority to TW084108584A01A priority Critical patent/TW341746B/en
Application granted granted Critical
Publication of TW341746B publication Critical patent/TW341746B/en

Links

Landscapes

  • Amplifiers (AREA)

Abstract

A protection circuit for an electric ballast, which comprises a protection transistor, a limit current resistor and a resistor for sampling current or an emitter resistor; which is characterized in that: the collector of the protective transistor is connected to one end of the base of the working transistor and the limit current resistor, the three being connected by direct coupling; the unidirectional diode can be replaced by a stable voltage diode due to the need for a limit voltage, the connection method thereof being different only in direction; the collector and emitter of the protection transistor are connected in parallel to a stable voltage diode, the Zener voltage of the stable voltage diode being constantly smaller than the breakdown voltage between the collector and the emitter of the protection transistor, the set value of the Zener voltage being determined according to the circuit requirement and not limited by itself.
TW084108584A01A 1996-05-06 1996-05-06 Protection circuit for electric ballast (addition one) TW341746B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
TW084108584A01A TW341746B (en) 1996-05-06 1996-05-06 Protection circuit for electric ballast (addition one)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW084108584A01A TW341746B (en) 1996-05-06 1996-05-06 Protection circuit for electric ballast (addition one)

Publications (1)

Publication Number Publication Date
TW341746B true TW341746B (en) 1998-10-01

Family

ID=58263547

Family Applications (1)

Application Number Title Priority Date Filing Date
TW084108584A01A TW341746B (en) 1996-05-06 1996-05-06 Protection circuit for electric ballast (addition one)

Country Status (1)

Country Link
TW (1) TW341746B (en)

Similar Documents

Publication Publication Date Title
DE3366212D1 (en) Protection circuit for a switching transistor
KR900000098B1 (en) Protector circuit
EP0967721A3 (en) Semiconductor protection device and power converting system
EP0845848A3 (en) I.C. power supply terminal protection clamp
UA39185C2 (en) Circuit for surge and overload current protection, in particular for telecommunication installations
TR199901969T2 (en) Device and method for protecting objects against overcurrent by reducing overcurrent and limiting current.
NO176500C (en) Direct current converter with a coupling device for generating the value of current
JPS57109189A (en) Output buffer circuit
EP0388616A3 (en) Overcurrent protective circuit for electrostatic self-turn-off devices
DE3377441D1 (en) Switching power supply with overcurrent protection
JPS5765909A (en) Line driver circuit having overcurrent protecting function
TW341746B (en) Protection circuit for electric ballast (addition one)
ES8307416A1 (en) Protection circuit for integrated circuit devices
ES487447A1 (en) Overvoltage protection device
KR870008240A (en) Reference voltage circuit
SE9901483L (en) Surge
JPS57115854A (en) Input protective circuit
ATE233023T1 (en) RESIDUAL CURRENT PROTECTION DEVICE
EP0748036A3 (en) Device for turn-on detection of the switches or a power converter
JPS54120847A (en) Protective equipment for electronic circuit
JPS5585061A (en) Protective circuit for transistor
ES2125204A1 (en) Device for neutral-continuity supervision and protection against operating overvoltages
JPS5780829A (en) Output protecting circuit device
CN1219816A (en) Slow-start and over-current protection circuit for ringing current generator
JPS5794819A (en) Current control system of constant voltage circuit