CN107318210B - Metal halogen lamp electric ballast protects circuit - Google Patents
Metal halogen lamp electric ballast protects circuit Download PDFInfo
- Publication number
- CN107318210B CN107318210B CN201710565605.9A CN201710565605A CN107318210B CN 107318210 B CN107318210 B CN 107318210B CN 201710565605 A CN201710565605 A CN 201710565605A CN 107318210 B CN107318210 B CN 107318210B
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- resistance
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- seu1005
- comparator
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
- H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
- H05B41/292—Arrangements for protecting lamps or circuits against abnormal operating conditions
- H05B41/2921—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
- H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
- H05B41/292—Arrangements for protecting lamps or circuits against abnormal operating conditions
- H05B41/2921—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
- H05B41/2926—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against internal abnormal circuit conditions
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
The invention discloses a kind of metal halogen lamp electric ballasts to protect circuit; its sampled signal can obviously distinguish normal and abnormal difference; and driving circuit is influenced small; protect circuit structure simple; the resonance starting of ballast is completed by four bit comparators, circuit can continue working when normal, (unloaded when abnormality; thermal starting, lamp aging) turn off and latch the function of driving circuit.It is at low cost, high reliablity, and by simply adjusting, applied on the electric ballast of different capacity.
Description
Technical field
The present invention relates to protection circuits more particularly to a kind of metal halogen lamp electric ballast to protect circuit.
Background technique
Electric ballast is small in size with its, and efficiency is high, captures consequence in novel illumination field, but to ballast
Abnormal protection is always one of technological difficulties.
Electric ballast is in zero load, when Metal halogen lamp thermal starting and fluorescent tube aging etc. start abnormality, since Passive LC is humorous
Vibration can generate excessively high high-frequency current in circuit, and high current flows through power switch tube, can generate high temperature or high current breakdown VDMOS
(power switch tube) causes the damage of ballast, notably causes fire and causes the heavy losses of property.
Existing ballast protecting circuit scheme is summarized as two ways:
1, it is sampled by circuit, the size sampled using monolithic machine testing, control circuit is worked in different mode；
2, it is sampled by circuit, the protection act of circuit is then completed using the on state characteristic of thyristor.
Since the protected mode of single-chip microcontroller is although reliable but at high cost, and thyristor protection is at low cost, and reliability is insufficient.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of golden halogen for the defect being related to described in background technique
Lamp electronic ballast protects circuit.
The present invention uses following technical scheme to solve above-mentioned technical problem:
A kind of metal halogen lamp electric ballast protection circuit, the metal halogen lamp electric ballast is by chip SEU1005 and outside
Portion's voltage is connected, and the protection circuit includes that comparator circuit and the first VDMOS are managed；
The output end VOUT of the comparator circuit drives the grid end of the first VDMOS pipe；
The drain terminal of the first VDMOS pipe, source respectively with the power supply VDD of chip SEU1005, chip enable end SP
It is connected；
The comparator circuit includes first to fourth voltage comparator, the first to thirteenth resistor, the first to the second electricity
Hold and the 2nd VDMOS is managed；
Power supply VDD, the ground terminal that the power end of first to fourth voltage comparator meets chip SEU1005 are equal
Meet GND；
The non-inverting input terminal of first voltage comparator one end phase with one end of the 5th resistance, first capacitor C1 respectively
Even, anti-phase input terminates preset reference voltage VREF, output end respectively with the grid end of the 2nd VDMOS pipe, first
One end of resistance is connected；
The drain terminal of the 2nd VDMOS pipe respectively with one end of the 6th resistance, second voltage comparator it is same mutually defeated
Enter end to be connected, source is connected with one end of the 7th resistance；
Electric current generates in the inverting input terminal access electron ballast passive LC resonance circuit of the second voltage comparator
Sampled signal, output end is connected with one end of one end of second resistance, the 8th resistance respectively；
The other end of 8th resistance anti-phase input with one end of the 9th resistance, tertiary voltage comparator respectively
End is connected；
The non-inverting input terminal of the tertiary voltage comparator respectively with one end of the tenth resistance, eleventh resistor one end,
One end of second capacitor is connected, output end respectively with the other end of the eleventh resistor, one end of 3rd resistor, the 4th voltage
The inverting input terminal of comparator is connected；
The non-inverting input terminal of 4th voltage comparator respectively with one end of the twelfth resistor, thirteenth resistor
One end is connected, and output end is connected with the output end VOUT of one end of the 4th resistance, voltage comparator circuit respectively；
The other end of 5th resistance, the other end of first resistor, the other end of the 6th resistance, second resistance it is another
End, the other end of the tenth resistance, the other end of 3rd resistor, the other end of twelfth resistor, the 4th resistance the other end connect
The power supply VDD of chip SEU1005；
The other end of the first capacitor, the other end of the 7th resistance, the other end of the 9th resistance, the second capacitor it is another
It holds, the other end of thirteenth resistor meets GND.
The further prioritization scheme of circuit, the first VDMOS are protected as a kind of metal halogen lamp electric ballast of the present invention
It manages, the model of the 2nd VDMOS pipe is 2N60.
The further prioritization scheme of circuit is protected as a kind of metal halogen lamp electric ballast of the present invention, described first to fourth
Voltage comparator is all made of TLC339 type voltage comparator.
The invention adopts the above technical scheme compared with prior art, has following technical effect that
1. it is at low cost, and high reliablity；
2. driving based on chip SEU1005, ballast drive circuit can be turned off in circuit abnormality, safety is high
Effect illumination.
Detailed description of the invention
Fig. 1 is comparator circuit in the present invention, the first VDMOS pipe, the connection schematic diagram between chip SEU1005；
Fig. 2 is the circuit diagram of comparator circuit in the present invention；
Fig. 3 is the circuit diagram of the sample circuit of electric current in electron ballast passive LC resonance circuit in the present invention.
Specific embodiment
Technical solution of the present invention is described in further detail with reference to the accompanying drawing.
The present invention can be embodied in many different forms, and should not be assumed that be limited to the embodiments described herein.On the contrary,
It is thorough and complete to these embodiments are provided so that the disclosure, and model of the invention will be given full expression to those skilled in the art
It encloses.In the accompanying drawings, for the sake of clarity it is exaggerated component.
It will be appreciated that though term first, second, third, etc., which may be used herein, describes each element, component and/or portion
Point, but these elements, component and/or part should not be limited by these terms.These terms be used only for by element, component and/or
Part mutually distinguishes.Therefore, first element discussed below, component and/or part without departing substantially from the present invention before imparting knowledge to students
Second element, component or part can be become by putting.
The invention discloses a kind of metal halogen lamp electric ballasts to protect circuit, and the metal halogen lamp electric ballast passes through chip
SEU1005 is connected with external voltage, and the protection circuit includes that comparator circuit and the first VDMOS are managed；
The output end VOUT of the comparator circuit drives the grid end of the first VDMOS pipe；
The drain terminal of the first VDMOS pipe, source respectively with the power supply VDD of chip SEU1005, chip enable end SP
It is connected；
The comparator circuit includes first to fourth voltage comparator, the first to thirteenth resistor, the first to the second electricity
Hold and the 2nd VDMOS is managed；
Power supply VDD, the ground terminal that the power end of first to fourth voltage comparator meets chip SEU1005 are equal
Meet GND；
The non-inverting input terminal of first voltage comparator one end phase with one end of the 5th resistance, first capacitor C1 respectively
Even, anti-phase input terminates preset reference voltage VREF, output end respectively with the grid end of the 2nd VDMOS pipe, first
One end of resistance is connected；
The drain terminal of the 2nd VDMOS pipe respectively with one end of the 6th resistance, second voltage comparator it is same mutually defeated
Enter end to be connected, source is connected with one end of the 7th resistance；
Electric current generates in the inverting input terminal access electron ballast passive LC resonance circuit of the second voltage comparator
Sampled signal, output end is connected with one end of one end of second resistance, the 8th resistance respectively；
The other end of 8th resistance anti-phase input with one end of the 9th resistance, tertiary voltage comparator respectively
End is connected；
The non-inverting input terminal of the tertiary voltage comparator respectively with one end of the tenth resistance, eleventh resistor one end,
One end of second capacitor is connected, output end respectively with the other end of the eleventh resistor, one end of 3rd resistor, the 4th voltage
The inverting input terminal of comparator is connected；
The non-inverting input terminal of 4th voltage comparator respectively with one end of the twelfth resistor, thirteenth resistor
One end is connected, and output end is connected with the output end VOUT of one end of the 4th resistance, voltage comparator circuit respectively；
The other end of 5th resistance, the other end of first resistor, the other end of the 6th resistance, second resistance it is another
End, the other end of the tenth resistance, the other end of 3rd resistor, the other end of twelfth resistor, the 4th resistance the other end connect
The power supply VDD of chip SEU1005；
The other end of the first capacitor, the other end of the 7th resistance, the other end of the 9th resistance, the second capacitor it is another
It holds, the other end of thirteenth resistor meets GND.
First VDMOS is managed, the model of the 2nd VDMOS pipe is 2N60.
First to fourth voltage comparator is all made of TLC339 type voltage comparator.
SEU1005 chip has enable end, chip work when which is high level (or logic level is 1)
Make, low level (logic level 0) does not work；SEU1005 chip has output end, and the level of the output end is used to control
The conducting and shutdown of passive LC resonance circuit upper and lower sides VDMOS pipe.
Usually control IC has enable end, and the enable end SP of the driving circuit based on SEU1005 chip is in unprotected electricity
Vdd terminal (high level, chip operation) is connected to when road.As shown in Figure 1, the output end of comparator circuit does not connect directly in SP
End passes through driving VDMOS(2N60) VDD and SP are connected, this ensure that enough driving capabilities, and prevent due to output
Ballast job insecurity caused by VOUT is asynchronous with chip operating voltage, and experiment shows that this connection can make circuit work
Make normal.
Metal halogen lamp electric ballast working principle is first analyzed, this circuit is based on 70W electric ballast driving circuit, and chip is defeated
Upper and lower sides power switch tube is controlled out, and DC bus voltage is become high-frequency ac square wave, drives the work of lamp by half-bridge driven.Just
Often when starting, the time of a high pressure lighting can be undergone first, is not punctured in this period in lamp, as Fig. 3 shows that Metal halogen lamp is suitable
In impedance infinity, the square wave frequency and rear class LC parasitic loop of chip output match, then generate resonance, capacitor both ends generate
The high pressure of tens KV, electric current is very big in circuit at this time.Once Metal halogen lamp is broken down by high-voltage, it is equivalent to a variable resistance, resistance value
In hundred ohm levels, then capacitor C'2 in parallel does not work, at this time the electric current very little in circuit, and chip can export one just later
The frequency (lower than the frequency of resonance lighting) often to work, electric current is small in detection circuit at this time.Once lamp does not puncture, unloaded, heat is opened
It moves or phenomena such as aging occurs, electric current can be very big in circuit.To sum up, circuit is only after resonance high-voltage lighting and resonance are complete
When occurring abnormal, the electric current in circuit can be very big, under other situations, electric current very little in circuit.Due under abnormal conditions in circuit
Electric current can be very big always, then increase the power consumption of switching tube, and fever is serious, and switching tube can be burnt in several seconds.Therefore this guarantor
Protection circuit first has to guarantee that ballast will not turn off chip when high current occurs in resonance lighting, while terminating in the lighting time
Afterwards, ballast can be made to be constantly under normal operating conditions under normal circumstances, turns off driving circuit when abnormal rapidly.And restart
When, if energy lighting, can restart, be difficult to start if thermolamp, still turn off chip.
As shown in Fig. 2, first comparator is compared by a RC timing circuit and benchmark VREF, when voltage is also on capacitor C1
Before not up to VREF, comparator exports low level, rear class switching tube cannot be driven to be connected, then the second comparator positive input
Directly pull-up is VDD, is higher than reverse input end (being clamped at 10V), then handling output using late-class circuit is high level control
The connection of SP and VDD processed guarantee that circuit can be when high current occurs in loop resonance, normal lighting.Once having crossed resonance lighting
Time, protection circuit start working, and first comparator forward end is greater than VREF, then first comparator exports high level, then open
It is constantly on to close pipe, then passes through resistance R6, the signal of R7 partial pressure is that reference signal, at this time sampled signal and benchmark are compared
Compared with normal condition down-sampled signal is lower than benchmark, then the second comparator exports high level, by R2, after R8, R9 are divided, third
The positive of comparator terminates a RC delay, then voltage is lower than the partial pressure benchmark of backward end on capacitor C2, then third comparator is defeated
Low level out, and voltage final on capacitor C2 is obtained by the partial pressure of R10 and R11, wherein R11 is far smaller than R10, then on capacitor
Voltage is less than the voltage of comparator reverse input end, output locking low level.After the 4th comparator is reversed, high electricity is exported
It is flat.Once there are abnormal conditions, then the second comparator export low level, then after electric resistance partial pressure, third comparator it is reversed
End is down for 0, and positive input is a benchmark greater than 0, then third comparator exports high level, then fills to capacitor C2
Electricity, then the final voltage of capacitor C2 is VDD, and comparator output is always high level, is low electricity after the 4th comparator is reversed
Flat, then switching tube 2N60 is turned off, then turns off the connection of SP and VDD.Once chip turns off, then upper and lower sides VDMOS is managed no longer in turn
Conducting, then electric current is reduced to zero in circuit, and the second comparator reverse input end is lower than benchmark, the high electricity of the second comparator output at this time
Flat, then third comparator reverse input end becomes benchmark close to 1/3VDD, but voltage has been filled with as VDD on capacitor C2, then exports
High level is remained as, then after reversed, exports low level, chip is still within off state, then this design is completed to core
The locking of piece abnormal conditions, without shaking back and forth.
As shown in figure 3, sample circuit does not carry out current sample directly directly in resonant tank, but in side switch
Pipe 8,N60 one switching tube 2N60 of parallel connection, since the breadth length ratio of 2N60 is the 1/4 of 8N60, then according to electric current and metal-oxide-semiconductor breadth length ratio
Relationship it is found that the electric current for flowing through 2N60 is approximately equal to the 1/4 of loop current, and concatenates one with the drain terminal of 8N60 in the drain terminal of 2N60
A small inductor, the surge current breakdown 2N60 generated when mainly preventing circuit from just starting.And in the source of 2N60 between ground
One 20 ohm in parallel of resistance flows through the electric current mistake of 2N60 as sampled signal source, and when due to just starting and is abnormal
Cause greatly excessively high in ohmically pressure drop, then the level value of sampled signal is higher than the receptible maximum input voltage of comparator institute then
Lead to the damage of comparator, as soon as so then in resistance both ends 10V voltage-stabiliser tube in parallel, such comparator input terminal voltage clamper
In normal range (NR).Due to directly resistance both ends sampled signal be high-frequency signal, rear class protects circuit not easy to handle, then to resistance
Both end voltage signal is filtered.Filter circuit first passes through the fast pipe that restores and charges to capacitor C'1, and then capacitor C1 passes through big
Resistance R electric discharge, such sampled signal ripple is smaller, is easy to distinguish normal and abnormal signal, reaches reliable protected mode.
This protection circuit and sample circuit are by some simple resistance capacitance inductance, diode, voltage-stabiliser tube and a ratio
It is formed compared with device IC, Metal halogen lamp can be started when completing the sampling of circuit abnormality status signal, while guaranteeing normal, turned off when abnormal
And lock chip.It is at low cost, and high reliablity, while circuit parameter is adjusted according to the ballast of different capacity, according to this circuit
The adaptable protection circuit of principle design.
Those skilled in the art can understand that unless otherwise defined, all terms used herein (including skill
Art term and scientific term) there is meaning identical with the general understanding of those of ordinary skill in fields of the present invention.Also
It should be understood that those terms such as defined in the general dictionary should be understood that have in the context of the prior art
The consistent meaning of meaning will not be explained in an idealized or overly formal meaning and unless defined as here.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not limited to this hair the foregoing is merely a specific embodiment of the invention
Bright, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the present invention
Protection scope within.
Claims (3)
1. a kind of metal halogen lamp electric ballast protects circuit, the metal halogen lamp electric ballast passes through chip SEU1005 and outside
Voltage is connected, which is characterized in that the protection circuit includes that comparator circuit and the first VDMOS are managed；
The output end VOUT of the comparator circuit drives the grid end of the first VDMOS pipe；
The drain terminal of the first VDMOS pipe, source respectively with the power supply VDD of chip SEU1005, chip enable end SP phase
Even；
The comparator circuit include first to fourth voltage comparator, first to thirteenth resistor, the first to the second capacitor, with
And the 2nd VDMOS pipe；
Power supply VDD, the ground terminal that the power end of first to fourth voltage comparator meets chip SEU1005 connect
GND；
The non-inverting input terminal of the first voltage comparator is connected with one end of one end of the 5th resistance, first capacitor C1 respectively,
Anti-phase input terminates preset reference voltage VREF, output end grid end, the first resistor with the 2nd VDMOS pipe respectively
One end be connected；
The drain terminal of the 2nd VDMOS pipe non-inverting input terminal with one end of the 6th resistance, second voltage comparator respectively
It is connected, source is connected with one end of the 7th resistance；
What electric current generated in the inverting input terminal access electron ballast passive LC resonance circuit of the second voltage comparator adopts
Sample signal, output end are connected with one end of one end of second resistance, the 8th resistance respectively；
The other end of 8th resistance inverting input terminal phase with one end of the 9th resistance, tertiary voltage comparator respectively
Even；
The non-inverting input terminal of the tertiary voltage comparator respectively with one end of the tenth resistance, one end of eleventh resistor, second
One end of capacitor is connected, and output end compares with the other end of the eleventh resistor, one end of 3rd resistor, the 4th voltage respectively
The inverting input terminal of device is connected；
The non-inverting input terminal of 4th voltage comparator one end with one end of the twelfth resistor, thirteenth resistor respectively
It is connected, output end is connected with the output end VOUT of one end of the 4th resistance, voltage comparator circuit respectively；
The other end of 5th resistance, the other end of first resistor, the other end of the 6th resistance, second resistance the other end,
The other end of tenth resistance, the other end of 3rd resistor, the other end of twelfth resistor, the 4th resistance the other end connect chip
The power supply VDD of SEU1005；
The other end of the first capacitor, the other end of the 7th resistance, the other end of the 9th resistance, the second capacitor the other end,
The other end of thirteenth resistor meets GND；
SEU1005 chip has enable end, and chip operation, low level do not work when which is high level；SEU1005
Chip has an output end, and the level of the output end be used to control the conducting of passive LC resonance circuit upper and lower sides VDMOS pipe with
Shutdown；
In normally starting Metal halogen lamp, the square wave frequency and rear class LC parasitic loop of SEU1005 chip output match, and generate humorous
Vibration, the capacitor both ends in parallel with Metal halogen lamp generate high pressure, puncture Metal halogen lamp；SEU1005 chip can export one lower than humorous later
The normal working frequency of the frequency of vibration lighting；
The output end of circuit is protected to control the conducting and shutdown of the first VDMSO pipe, normally when starting, the high electricity of protection circuit output
It is flat, the first VDMSO pipe conducting, so that the enable end of SEU1005 chip is connected to power supply VDD obtains high level, SEU1005
Chip works normally, and upper and lower sides power tube is connected in turn in half-bridge drive circuit in control passive LC resonance circuit；It is abnormal to occur
When, circuit output low level, the shutdown of the first VDMSO pipe are protected, so that the enable end of SEU1005 chip and power supply VDD are disconnected
Open acquisition low level, the shutdown of SEU1005 chip controls in passive LC resonance circuit in half-bridge drive circuit upper and lower sides power tube not
It is connected in turn again.
2. metal halogen lamp electric ballast according to claim 1 protects circuit, which is characterized in that the first VDMOS pipe,
The model of 2nd VDMOS pipe is 2N60.
3. metal halogen lamp electric ballast according to claim 1 protects circuit, which is characterized in that first to fourth electricity
Pressure comparator is all made of TLC339 type voltage comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710565605.9A CN107318210B (en) | 2017-07-12 | 2017-07-12 | Metal halogen lamp electric ballast protects circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710565605.9A CN107318210B (en) | 2017-07-12 | 2017-07-12 | Metal halogen lamp electric ballast protects circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107318210A CN107318210A (en) | 2017-11-03 |
| CN107318210B true CN107318210B (en) | 2019-04-12 |
Family
ID=60178487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710565605.9A Active CN107318210B (en) | 2017-07-12 | 2017-07-12 | Metal halogen lamp electric ballast protects circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107318210B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2517223Y (en) * | 2001-10-18 | 2002-10-16 | 上海复旦微电子股份有限公司 | Preheating starting and overcurrent protection control device of electric ballast |
| CN101043782A (en) * | 2007-04-17 | 2007-09-26 | 吴壬华 | High-voltage gas discharge lamp voltage sampling and protective circuit |
| CN202396068U (en) * | 2011-12-16 | 2012-08-22 | 泉州市本电照明电器有限公司 | Electronic ballast of metal halogen lamp |
-
2017
- 2017-07-12 CN CN201710565605.9A patent/CN107318210B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2517223Y (en) * | 2001-10-18 | 2002-10-16 | 上海复旦微电子股份有限公司 | Preheating starting and overcurrent protection control device of electric ballast |
| CN101043782A (en) * | 2007-04-17 | 2007-09-26 | 吴壬华 | High-voltage gas discharge lamp voltage sampling and protective circuit |
| CN202396068U (en) * | 2011-12-16 | 2012-08-22 | 泉州市本电照明电器有限公司 | Electronic ballast of metal halogen lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107318210A (en) | 2017-11-03 |
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