CN204598443U - A kind of input undervoltage of electric ballast and overvoltage crowbar - Google Patents
A kind of input undervoltage of electric ballast and overvoltage crowbar Download PDFInfo
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- CN204598443U CN204598443U CN201520309908.0U CN201520309908U CN204598443U CN 204598443 U CN204598443 U CN 204598443U CN 201520309908 U CN201520309908 U CN 201520309908U CN 204598443 U CN204598443 U CN 204598443U
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Abstract
The utility model discloses a kind of input undervoltage and overvoltage crowbar of electric ballast, described protective circuit comprises sampling module, comparison module, referrer module and switch module.Export the first sampled voltage and the second sampled voltage to comparison module by sampling module, referrer module exports the first reference voltage and the second reference voltage to comparison module; Comparison module is by comparing the size of the first reference voltage and the first sampled voltage, and when the first sampled voltage is less than the first reference voltage, comparison module control switch module makes electric ballast drive IC quit work; Comparison module is also by comparing the size of the second reference voltage and the second sampled voltage, and when the second sampled voltage is greater than the second reference voltage, comparison module control switch module makes electric ballast drive IC quit work.Like this, effectively protect electric ballast drive IC and its circuit, prevent the situation of overvoltage and under-voltage work.
Description
Technical field
The utility model relates to lighting technical field, particularly a kind of input undervoltage of electric ballast and overvoltage crowbar.
Background technology
Refer to Fig. 1, the circuit structure of conventional electric ballast is made up of rectification circuit 100, booster circuit 200 and half-bridge drive circuit 300, is used for driving fluorescent lamp 400.Due to the electrical network instability very in some some areas of country, the scope of beating of civil power very large, this just brings some problems to our electric ballast, when input voltage beat scope excessive time just beyond the normal working range of electric ballast, electric ballast may just be in a kind of abnormal operating state, and electric ballast will be caused in this state to occur damaging.Because most electric ballast does not all have measuring ability and the defencive function of and overvoltage under-voltage for input voltage, so be cause because the scope of beating of electrical network is excessive in the very large reason of damage of some some regional electric ballasts of country.
And electric ballast drive IC (U1) conventional in the market does not all have to carry out under-voltage and function that is overvoltage protection for input voltage.
Thus prior art need to improve.
Utility model content
In view of above-mentioned the deficiencies in the prior art part, the purpose of this utility model is the input undervoltage and the overvoltage crowbar that provide a kind of electric ballast, can be electric ballast drive IC and provides under-voltage and overvoltage protection.
In order to achieve the above object, the utility model takes following technical scheme:
The input undervoltage of electric ballast and an overvoltage crowbar, comprising:
For comparing the voltage of first input end and the second input, high level is exported when the voltage of first input end input is greater than the voltage of the second input input, control switch module makes electric ballast drive IC close, the output low level when the voltage of first input end input is less than the voltage of the second input input, control switch module makes electric ballast drive IC open; And for comparing the voltage of the 3rd input and four-input terminal, high level is exported when the voltage of the 3rd input input is greater than the voltage of four-input terminal input, control switch module makes electric ballast drive IC close, the output low level when the voltage of the 3rd input input is less than the voltage of four-input terminal input, the comparison module that control switch module makes electric ballast drive IC open;
For the comparative result according to comparison module, control the switch module of electric ballast drive IC switch;
For exporting the first reference voltage to the first input end of comparison module, export the second reference voltage to the referrer module of the four-input terminal of comparison module;
For sampling to the input voltage of electric ballast and exporting the first sampled voltage to the second input of comparison module, export the second sampled voltage to the sampling module of the 3rd input of comparison module;
The input of described sampling module connects the output of the rectifier bridge of electric ballast, and the first output of described sampling module connects the second input of comparison module, and the second output of described sampling module connects the 3rd input of comparison module; First output of described referrer module connects the first input end of comparison module, and the second output of described referrer module connects the four-input terminal of comparison module; First output of described comparison module and the input of the second output connecting valve module, the output of described switch module connects the feeder ear of electric ballast drive IC.
In the input undervoltage of described electric ballast and overvoltage crowbar, described comparison module comprises twin voltage comparator, the 1IN+ end of described twin voltage comparator is the first input end of comparison module, connect the first output of referrer module, the 1IN-end of described twin voltage comparator is the second input of comparison module, connect the first output of sampling module, the 2IN+ end of described twin voltage comparator is the 3rd input of comparison module, connect the second output of sampling module, the 2IN-end of described twin voltage comparator is the four-input terminal of comparison module, connect the second output of referrer module, the 1OUT end of described twin voltage comparator is the first output of comparison module, the input of connecting valve module, the 2OUT end of described twin voltage comparator is the second output of comparison module, the input of connecting valve module, the Vcc end of described twin voltage comparator connects externally fed end, the GND of described twin voltage comparator holds ground connection.
In the input undervoltage of described electric ballast and overvoltage crowbar; the described protective circuit voltage also comprised for exporting the rectifier bridge of electric ballast carries out the division module of dividing potential drop; the input of described division module connects the output of the rectifier bridge of electric ballast, and the output of described division module connects sampling module.
In the input undervoltage of described electric ballast and overvoltage crowbar; described division module comprises the first resistance and the second resistance; one end of described first resistance is the output of the input of division module, the rectifier bridge of connection electric ballast; the other end of described first resistance be division module output, connect the input of sampling module and one end of the second resistance, the other end ground connection of described second resistance.
In the input undervoltage of described electric ballast and overvoltage crowbar, described sampling module comprises the 3rd resistance and the 4th resistance, one end of described 3rd resistance be sampling module input, connect the other end of the first resistance and one end of the second resistance, the other end of described 3rd resistance is the first output of sampling module, connects the 1IN-end of twin voltage comparator; One end of described 4th resistance connects one end of the other end of the first resistance, one end of the second resistance and the 3rd resistance, and the other end of described 4th resistance is the second output of sampling module, connects the 2IN+ end of twin voltage comparator.
In the input undervoltage of described electric ballast and overvoltage crowbar, described referrer module comprises the 5th resistance, the 6th resistance, the 7th resistance and the 8th resistance, one end of described 5th resistance connects the Vcc end of externally fed end and twin voltage comparator, and the other end of described 5th resistance is the first output of referrer module, connects the 1IN+ end of twin voltage comparator, also by the 6th grounding through resistance; One end of described 7th resistance connects externally fed end, the Vcc end of twin voltage comparator and one end of the 5th resistance, and the other end of described 7th resistance is the second output of referrer module, connects the 2IN-end of twin voltage comparator, also by the 8th grounding through resistance.
In the input undervoltage of described electric ballast and overvoltage crowbar; described switch module comprises triode; the grounded emitter of described triode; the collector electrode of described triode connects the feeder ear of electric ballast drive IC, and the base stage of described triode connects 1OUT end and the 2OUT end of twin voltage comparator.
In the input undervoltage of described electric ballast and overvoltage crowbar, described triode is NPN triode.
In the input undervoltage of described electric ballast and overvoltage crowbar; described protective circuit also comprises the first diode and the first electric capacity; the positive pole of described first diode connects the output of the rectifier bridge of electric ballast, and the negative pole of described first diode connects one end of the first resistance, also by the first capacity earth.
Compared to prior art, the input undervoltage of the electric ballast that the utility model provides and overvoltage crowbar, export the first sampled voltage and the second sampled voltage to comparison module by sampling module, referrer module exports the first reference voltage and the second reference voltage to comparison module; Comparison module is by comparing the size of the first reference voltage and the first sampled voltage, and when the first sampled voltage is less than the first reference voltage, illustrate that the output voltage of electric ballast is under-voltage, comparison module control switch module makes electric ballast drive IC quit work; Comparison module is also by comparing the size of the second reference voltage and the second sampled voltage, when the second sampled voltage is greater than the second reference voltage, the output voltage overvoltage of electric ballast is described, comparison module control switch module makes electric ballast drive IC quit work, and in other cases, electric ballast drive IC normally works.Like this, effectively protect electric ballast drive IC and its circuit, prevent the situation of overvoltage and under-voltage work.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of existing electric ballast;
The input undervoltage of the electric ballast that Fig. 2 provides for the utility model and the circuit diagram of overvoltage crowbar.
Embodiment
The utility model provides a kind of input undervoltage and overvoltage crowbar of electric ballast, sampling module, referrer module and comparison module, for electric ballast drive IC provides under-voltage and overvoltage protection.
For making the purpose of this utility model, technical scheme and effect clearly, clearly, referring to the accompanying drawing embodiment that develops simultaneously, the utility model is further described.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Refer to Fig. 2, the input undervoltage of the electric ballast that the utility model provides and overvoltage crowbar, comprise sampling module 20, comparison module 30, referrer module 40 and switch module 50.
Described sampling module 20, for sampling to the input voltage of electric ballast and exporting the first sampled voltage to the second input of comparison module, exports the second sampled voltage to the 3rd input of comparison module.The input voltage of described electric ballast can be obtained indirectly by the voltage of the rectification bridge output end of electric ballast.Described first sampled voltage and the second sampled voltage indirectly can represent the input voltage of electric ballast.The input termination civil power (the live wire L in Fig. 2, zero line N and bottom line G) of described rectifier bridge
Described comparison module 30, for comparing the voltage of first input end and the second input, high level is exported when the voltage of first input end input is greater than the voltage of the second input input, control switch module 50 makes electric ballast drive IC close, the output low level when the voltage of first input end input is less than the voltage of the second input input, control switch module 50 makes electric ballast drive IC open; And for comparing the voltage of the 3rd input and four-input terminal, high level is exported when the voltage of the 3rd input input is greater than the voltage of four-input terminal input, control switch module 50 makes electric ballast drive IC close, the output low level when the voltage of the 3rd input input is less than the voltage of four-input terminal input, control switch module 50 makes electric ballast drive IC open.
Described referrer module 40, for exporting the first reference voltage to the first input end of comparison module 30, exports the second reference voltage to the four-input terminal of comparison module 30.The value of described first reference voltage is the minimum voltage of electric ballast drive IC work, lower than the first reference voltage, sampled voltage illustrates that the operating voltage of electric ballast drive IC is lower than minimum voltage, enters under-voltage condition; The value of described second reference voltage is the maximum voltage of electric ballast drive IC work, more than the second reference voltage, sampled voltage illustrates that the operating voltage of electric ballast drive IC is higher than maximum voltage, enters overvoltage condition.
Described switch module 50, for the comparative result according to comparison module 30, controls the Kai Heguan of electric ballast drive IC, that is, controls the operating state of electric ballast drive IC.
The input of described sampling module 20 connects the output of the rectifier bridge of electric ballast, first output 1 of described sampling module 20 connects the second input of comparison module 30, and the second output 2 of described sampling module 20 connects the 3rd input of comparison module 30; First output 1 ' of described referrer module 40 connects the first input end of comparison module 30, and the second output 2 ' of described referrer module 40 connects the four-input terminal of comparison module 30; First output of described comparison module 30 and the input of the second output connecting valve module 50, the output of described switch module 50 connects the feeder ear of electric ballast drive IC.
The utility model is by the voltage of the output of detected electrons ballast rectifier bridge; the indirectly input voltage of detected electrons ballast; and judge the operating state of electric ballast drive IC; comparator the overvoltage of electric ballast drive IC and under-voltage time; control electric ballast drive IC by switch module to close, when the input voltage of electric ballast is normal, electric ballast drive IC is opened; effectively achieve overvoltage and under-voltage protection, protect whole circuit of electronic ballast.
Described protective circuit also comprises division module 10; described division module 10; voltage for exporting the rectifier bridge of electric ballast carries out dividing potential drop, and the input of described division module 10 connects the output of the rectifier bridge of electric ballast, and the output of described division module 10 connects sampling module 20.
Described comparison module 30 comprises twin voltage comparator U2, the 1IN+ end of described twin voltage comparator U2 is the first input end of comparison module 30, connect the first output 1 ' of referrer module 40, the 1IN-end of described twin voltage comparator U2 is the second input of comparison module 30, connect the first output 1 of sampling module 20, the 2IN+ end of described twin voltage comparator U2 is the 3rd input of comparison module 30, connect the second output 2 of sampling module 20, the 2IN-end of described twin voltage comparator U2 is the four-input terminal of comparison module 30, connect the second output 2 ' of referrer module 40, the 1OUT end of described twin voltage comparator U2 is the first output of comparison module 30, the input of connecting valve module 50, the 2OUT end of described twin voltage comparator U2 is the second output of comparison module 30, the input of connecting valve module 50, the Vcc end of described twin voltage comparator U2 connects externally fed end VCC, the GND of described twin voltage comparator U2 holds ground connection.Described twin voltage comparator U2 effectively saves the structure of circuit and the area of pcb board.Preferably, the model of described twin voltage comparator U2 is LM393.
Further, described division module 10 comprises the first resistance R1 and the second resistance R2, one end of described first resistance R1 is the output of the input of division module 10, the rectifier bridge of connection electric ballast, the other end of described first resistance R1 be division module 10 output, connect the input of sampling module 20 and one end of the second resistance R2, the other end ground connection of described second resistance R2.
Described sampling module 20 comprises the 3rd resistance R3 and the 4th resistance R4, one end of described 3rd resistance R3 be sampling module 20 input, connect the other end of the first resistance R1 and one end of the second resistance R2, the other end of described 3rd resistance R3 is the first output of sampling module 20, connects the 1IN-end of twin voltage comparator U2; One end of described 4th resistance R4 connects one end of the other end of the first resistance R1, one end of the second resistance R2 and the 3rd resistance R3, and the other end of described 4th resistance R4 is the second output of sampling module 20, connects the 2IN+ end of twin voltage comparator U2.The resistance of described 3rd resistance R3 and the 4th resistance R4 is equal, that is, described first sampled voltage is identical with the second sampled voltage size, and certainly, also as required the resistance of the 3rd resistance R3 and the 4th resistance R4 can be arranged difference, the utility model is not construed as limiting.
Described referrer module 40 comprises the 5th resistance R5, the 6th resistance R6, the 7th resistance R7 and the 8th resistance R8, one end of described 5th resistance R5 connects the Vcc end of externally fed end VCC and twin voltage comparator U2, and the other end of described 5th resistance R5 is the first output 1 ' of referrer module 40, connects the 1IN+ end of twin voltage comparator U2, also by the 6th resistance R6 ground connection; One end of described 7th resistance R7 connects externally fed end VCC, the Vcc end of twin voltage comparator U2 and one end of the 5th resistance R5, and the other end of described 7th resistance R7 is the second output 2 ' of referrer module 40, connects the 2IN-end of twin voltage comparator U2, also by the 8th resistance R8 ground connection.
Described switch module 50 comprises triode Q1, the grounded emitter of described triode Q1, and the collector electrode of described triode Q1 connects the feeder ear Vcc of electric ballast drive IC, and the base stage of described triode Q1 connects 1OUT end and the 2OUT end of twin voltage comparator U2.Preferably, described triode Q1 is NPN triode.
The first diode D1 and the first electric capacity C1 is also comprised please continue to refer to protective circuit described in Fig. 2; the positive pole of described first diode D1 connects the output of the rectifier bridge of electric ballast, and the negative pole of described first diode D1 connects one end of the first resistance R1, also by the first electric capacity C1 ground connection.
Described protective circuit also comprises the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5, the 6th electric capacity C6, the 9th resistance R9, the tenth resistance R10, the 11 resistance R11 and the 12 resistance R12.One end of described second electric capacity C2 connects one end of the other end of the first resistance R1, one end of the 3rd resistance R3 and the 4th resistance R4, the other end ground connection of described second electric capacity C2; One end of described 3rd electric capacity C3 connects the other end of the 3rd resistance R3 and the 1IN-end of twin voltage comparator U2, the other end ground connection of described 3rd electric capacity C3; One end of described 4th electric capacity C4 connects the other end of the 4th resistance R4 and the 2IN+ end of twin voltage comparator U2, the other end ground connection of described 4th electric capacity C4; One end of described 5th electric capacity C5 connect the 1IN+ end of twin voltage comparator U2, the 5th resistance R5 the other end, also by the 6th resistance R6 ground connection, the other end ground connection of described 5th electric capacity C5; One end of described 6th electric capacity C6 connects one end of the 12 resistance R12 and the Vcc end of twin voltage comparator U2, the other end ground connection of described 6th electric capacity C6; Described externally fed end VCC connects the 1OUT end of twin voltage comparator U2 and one end of the tenth resistance R10 by the 9th resistance R9, the other end of described tenth resistance R10 connects one end of the 11 resistance R11 and the base stage of triode Q1, and the other end of described 11 resistance R11 connects the 2OUT end of twin voltage comparator U2 and the other end of the 12 resistance R12.
In sum, the input undervoltage of the electric ballast that the utility model provides and overvoltage crowbar, time too low at input voltage, too high, turn off IC power supply in ballast, make product no longer include output, prevent ballast internal circuit from damaging.
Be understandable that; for those of ordinary skills; can be equal to according to the technical solution of the utility model and utility model design thereof and replace or change, and all these change or replace the protection range that all should belong to the claim appended by the utility model.
Claims (9)
1. the input undervoltage of electric ballast and an overvoltage crowbar, is characterized in that, comprising:
For comparing the voltage of first input end and the second input, high level is exported when the voltage of first input end input is greater than the voltage of the second input input, control switch module makes electric ballast drive IC close, the output low level when the voltage of first input end input is less than the voltage of the second input input, control switch module makes electric ballast drive IC open; And for comparing the voltage of the 3rd input and four-input terminal, high level is exported when the voltage of the 3rd input input is greater than the voltage of four-input terminal input, control switch module makes electric ballast drive IC close, the output low level when the voltage of the 3rd input input is less than the voltage of four-input terminal input, the comparison module that control switch module makes electric ballast drive IC open;
For the comparative result according to comparison module, control the switch module of electric ballast drive IC switch;
For exporting the first reference voltage to the first input end of comparison module, export the second reference voltage to the referrer module of the four-input terminal of comparison module;
For sampling to the input voltage of electric ballast and exporting the first sampled voltage to the second input of comparison module, export the second sampled voltage to the sampling module of the 3rd input of comparison module;
The input of described sampling module connects the output of the rectifier bridge of electric ballast, and the first output of described sampling module connects the second input of comparison module, and the second output of described sampling module connects the 3rd input of comparison module; First output of described referrer module connects the first input end of comparison module, and the second output of described referrer module connects the four-input terminal of comparison module; First output of described comparison module and the input of the second output connecting valve module, the output of described switch module connects the feeder ear of electric ballast drive IC.
2. the input undervoltage of electric ballast according to claim 1 and overvoltage crowbar, it is characterized in that, described comparison module comprises twin voltage comparator, the 1IN+ end of described twin voltage comparator is the first input end of comparison module, connect the first output of referrer module, the 1IN-end of described twin voltage comparator is the second input of comparison module, connect the first output of sampling module, the 2IN+ end of described twin voltage comparator is the 3rd input of comparison module, connect the second output of sampling module, the 2IN-end of described twin voltage comparator is the four-input terminal of comparison module, connect the second output of referrer module, the 1OUT end of described twin voltage comparator is the first output of comparison module, the input of connecting valve module, the 2OUT end of described twin voltage comparator is the second output of comparison module, the input of connecting valve module, the Vcc end of described twin voltage comparator connects externally fed end, the GND of described twin voltage comparator holds ground connection.
3. the input undervoltage of electric ballast according to claim 2 and overvoltage crowbar; it is characterized in that; the described protective circuit voltage also comprised for exporting the rectifier bridge of electric ballast carries out the division module of dividing potential drop; the input of described division module connects the output of the rectifier bridge of electric ballast, and the output of described division module connects sampling module.
4. the input undervoltage of electric ballast according to claim 3 and overvoltage crowbar; it is characterized in that; described division module comprises the first resistance and the second resistance; one end of described first resistance is the output of the input of division module, the rectifier bridge of connection electric ballast; the other end of described first resistance be division module output, connect the input of sampling module and one end of the second resistance, the other end ground connection of described second resistance.
5. the input undervoltage of electric ballast according to claim 4 and overvoltage crowbar, it is characterized in that, described sampling module comprises the 3rd resistance and the 4th resistance, one end of described 3rd resistance be sampling module input, connect the other end of the first resistance and one end of the second resistance, the other end of described 3rd resistance is the first output of sampling module, connects the 1IN-end of twin voltage comparator; One end of described 4th resistance connects one end of the other end of the first resistance, one end of the second resistance and the 3rd resistance, and the other end of described 4th resistance is the second output of sampling module, connects the 2IN+ end of twin voltage comparator.
6. the input undervoltage of electric ballast according to claim 5 and overvoltage crowbar, it is characterized in that, described referrer module comprises the 5th resistance, the 6th resistance, the 7th resistance and the 8th resistance, one end of described 5th resistance connects the Vcc end of externally fed end and twin voltage comparator, and the other end of described 5th resistance is the first output of referrer module, connects the 1IN+ end of twin voltage comparator, also by the 6th grounding through resistance; One end of described 7th resistance connects externally fed end, the Vcc end of twin voltage comparator and one end of the 5th resistance, and the other end of described 7th resistance is the second output of referrer module, connects the 2IN-end of twin voltage comparator, also by the 8th grounding through resistance.
7. the input undervoltage of electric ballast according to claim 6 and overvoltage crowbar; it is characterized in that; described switch module comprises triode; the grounded emitter of described triode; the collector electrode of described triode connects the feeder ear of electric ballast drive IC, and the base stage of described triode connects 1OUT end and the 2OUT end of twin voltage comparator.
8. the input undervoltage of electric ballast according to claim 7 and overvoltage crowbar, it is characterized in that, described triode is NPN triode.
9. the input undervoltage of electric ballast according to claim 8 and overvoltage crowbar; it is characterized in that; described protective circuit also comprises the first diode and the first electric capacity; the positive pole of described first diode connects the output of the rectifier bridge of electric ballast, and the negative pole of described first diode connects one end of the first resistance, also by the first capacity earth.
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| CN201520309908.0U CN204598443U (en) | 2015-05-14 | 2015-05-14 | A kind of input undervoltage of electric ballast and overvoltage crowbar |
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| CN201520309908.0U CN204598443U (en) | 2015-05-14 | 2015-05-14 | A kind of input undervoltage of electric ballast and overvoltage crowbar |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064774A (en) * | 2017-04-17 | 2017-08-18 | 成都卓创科微电子有限公司 | Multichannel ratio of extreme values based on high-speed comparator array compared with positioning circuit, chip |
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2015
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064774A (en) * | 2017-04-17 | 2017-08-18 | 成都卓创科微电子有限公司 | Multichannel ratio of extreme values based on high-speed comparator array compared with positioning circuit, chip |
| CN107064774B (en) * | 2017-04-17 | 2023-06-27 | 江阴元灵芯旷微电子技术有限公司 | Multipath extremum comparison and positioning circuit and chip based on high-speed comparator array |
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