CN2185964Y - Protector for electronic ballast - Google Patents
Protector for electronic ballast Download PDFInfo
- Publication number
- CN2185964Y CN2185964Y CN 93212320 CN93212320U CN2185964Y CN 2185964 Y CN2185964 Y CN 2185964Y CN 93212320 CN93212320 CN 93212320 CN 93212320 U CN93212320 U CN 93212320U CN 2185964 Y CN2185964 Y CN 2185964Y
- Authority
- CN
- China
- Prior art keywords
- ballast
- current
- thermistor
- coil
- electronic ballast
- 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.)
- Expired - Fee Related
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- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
The utility model provides a protector for an electronic ballast. A negative temperature coefficient thermal resistor is respectively paralleled between the base of the two switching transistors of an improved type electronic ballast and an emitter. The resistor is close to the ballast coil of the ballast. When a lamp tube is aging and can not be started, the utility model can effectively protect the ballast from burnout.
Description
The utility model belongs to the household appliance field, is used to protect electronic ballast for fluoresent lamp.
At present, electric ballast is when fluorescent tube is aging can not start the time, and lamp tube ends can not constitute the loop, and fluorescent tube equivalent electric resistive is big, causes the serious off resonance of ballast output loop, and total current increases to normal 4-5 doubly, very fast ballast is burnt out.The modified model electric ballast of some manufacturer production is that the base stage at switch triode has sealed in capacitance, has suppressed the growth of total current effectively.But the resonance current in the output loop is excessive, and time one length causes ballast coil high temperature, makes E type magnetic core magnetization curve variation, causes the loop off resonance, and final total current increases gradually, and ballast is burnt out.
The purpose of this utility model is to add a protective device on the modified model electric ballast, when fluorescent tube is aging, ballast can not burnt out.
The utility model is to realize like this, the thermistor of each negative temperature coefficient in parallel between the base stage of two switch triodes of modified model electric ballast and emitter, this thermistor is close on the ballast coil of electric ballast, the variations in temperature of induction ballast coil.When fluorescent tube is aging can not start the time; fluorescent tube equivalent electric resistive is big; the output loop off resonance, the resonance current of ballast coil increases, and the ballast coil temperature raises gradually; the thermistor resistance of negative temperature coefficient reduces gradually; shunt current to the switch transistor base increases gradually, and the electric current that is added in the switch triode base stage reduces gradually, causes the transistor collector electric current obviously to reduce until disappearance; total current also obviously reduces until disappearance, thereby has protected ballast.
Below in conjunction with accompanying drawing the utility model is done further detail narration.
Fig. 1 is the circuit of electronic ballast figure that is added with protective device.
Fig. 2 is the scheme of installation of thermistor on ballast coil.
The utility model is mainly by the thermistor Rt of negative temperature coefficient
1, Rt
2Constitute.Rt
1Be connected in parallel on switch triode VT
1Base stage and emitter between, to switch triode VT
1Base current play shunting action.RT
2Be connected in parallel on switch triode VT
2Base stage and emitter between, to switch triode VT
2Base current play shunting action.RT
1And RT
2Be close on the ballast coil L variations in temperature of induction ballast coil L.When fluorescent tube is aging can not start the time, fluorescent tube equivalent electric resistive is big, the output loop off resonance, and the resonance current of ballast coil L increases, and causes its temperature to raise, and is close to the negative tempperature coefficient thermistor RT on the ballast circle L
1, RT
2Resistance decreases, and it is to switch triode VT
1, VT
2Shunt current increase thereupon, be added in switch triode VT
1, VT
2Electric current on the base stage reduces thereupon, causes switch triode VT
1, VT
2Collector current obviously reduces until disappearance, and total current also obviously reduces until disappearance, thereby has protected ballast.
With the 30W fluorescent tube is example, seals in an alternating current ammeter in the supply line, to observe the working condition of ballast.When fluorescent tube is aging can not normally start the time, fluorescent tube equivalent electric resistive is big, and the resonance current in the output loop increases, and causes total current to rise to 0.25A by just often 0.13A and increases gradually.Because the increase of resonance current causes the temperature of ballast coil L to raise gradually, is close to the negative tempperature coefficient thermistor RT on the ballast coil L
1, RT
2The temperature of sensing ballast coil L raises, and its resistance is descended gradually by 75 Ω under the normal condition, passes through RT
1, RT
2Electric current also correspondingly increase, cause switch triode VT
1, VT
2Base current reduce gradually, collector current obviously reduces, total current also obviously reduces.Approximately through 3.5 minutes, thermistor RT
1, RT
2Resistance drop to below 10 Ω, flow through switch triode VT
1, VT
2Base current less than the lowest resonance electric current, make switch triode VT
1, VT
2Enter cut-off state, the total current of circuit is decreased to zero.Because the waste heat of ballast coil L is still to thermistor RT
1, RT
2Heat, make switch triode still be in cut-off state.Need after 8 minutes approximately, because the heat of ballast coil L distributes gradually, temperature descends gradually, thermistor RT
1, RT
2Resistance increases gradually, and circuit restarts, and repeats above-mentioned protection process then again.
Claims (1)
- A kind of electronic ballast protection device, mainly the thermistor by negative temperature coefficient constitutes.It is characterized in that: the thermistor of each negative temperature coefficient in parallel between the base stage of two switch triodes of modified model electric ballast and emitter, this thermistor is close on the ballast coil of electric ballast.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93212320 CN2185964Y (en) | 1993-05-01 | 1993-05-01 | Protector for electronic ballast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93212320 CN2185964Y (en) | 1993-05-01 | 1993-05-01 | Protector for electronic ballast |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2185964Y true CN2185964Y (en) | 1994-12-21 |
Family
ID=33793699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93212320 Expired - Fee Related CN2185964Y (en) | 1993-05-01 | 1993-05-01 | Protector for electronic ballast |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2185964Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103634998A (en) * | 2012-08-22 | 2014-03-12 | 深圳市海洋王照明工程有限公司 | Lamp circuit |
-
1993
- 1993-05-01 CN CN 93212320 patent/CN2185964Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103634998A (en) * | 2012-08-22 | 2014-03-12 | 深圳市海洋王照明工程有限公司 | Lamp circuit |
| CN103634998B (en) * | 2012-08-22 | 2018-08-07 | 深圳市海洋王照明工程有限公司 | A kind of lamp circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |