CN104682338A - Protection circuit and lighting equipment - Google Patents
Protection circuit and lighting equipment Download PDFInfo
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- CN104682338A CN104682338A CN201310616128.6A CN201310616128A CN104682338A CN 104682338 A CN104682338 A CN 104682338A CN 201310616128 A CN201310616128 A CN 201310616128A CN 104682338 A CN104682338 A CN 104682338A
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Abstract
An embodiment of the invention discloses a protection circuit and a piece of lighting equipment. The protection circuit is connected between a power supply and a driving circuit; the protection circuit comprises a switch circuit and a control circuit, wherein the switch circuit is used for connecting or disconnecting the connection of the driving circuit and the power supply; a first end of the switch circuit is connected with the power supply; the second end of the switch circuit is connected with a first end of the control circuit; the control circuit is used for controlling the switch circuit to disconnect the connection of the driving circuit and the power supply when the voltage of the power supply exceeds a threshold voltage corresponding to the driving circuit; the first end of the control circuit is connected with the second end of the switch circuit; the second end of the control circuit is grounded; the first end of the control circuit is also connected with the input end of the driving circuit. According to the protection circuit disclosed by the embodiment of the invention, when the voltage of the power supply exceeds the threshold voltage corresponding to the driving circuit, the connection of the driving circuit and the power supply is disconnected, so that the driving circuit is protected.
Description
Technical field
The present invention relates to electronic technology field, particularly relate to a kind of protective circuit and lighting apparatus.
Background technology
Lighting source in lighting apparatus works usually under the driving of drive circuit, corresponding threshold voltage during drive circuit works, when the voltage of power supply exceedes threshold voltage corresponding to drive circuit, easily cause the component damage in drive circuit, there is potential safety hazard, and then also can affect the normal use of lighting apparatus.
Summary of the invention
Embodiment of the present invention technical problem to be solved is: provide a kind of protective circuit, when supply voltage exceedes threshold voltage corresponding to drive circuit, can cut off the connection of drive circuit and power supply in time.
In order to solve the problems of the technologies described above, embodiments provide a kind of protective circuit, be connected between power supply and drive circuit, this protective circuit comprises: switching circuit and control circuit;
Described switching circuit is for connecting or disconnecting the connection of described drive circuit and power supply, and the first end of described switching circuit is connected with described power supply, and the second end of described switching circuit is connected with the first end of described control circuit;
Described control circuit is used for when the voltage of described power supply exceedes threshold voltage corresponding to described drive circuit, control the connection that described switching circuit disconnects described drive circuit and power supply, the first end of described control circuit is connected with the second end of described switching circuit, the second end ground connection of described control circuit, and the first end of described control circuit is also connected with the input of described drive circuit.
As the optional execution mode of one, described switching circuit comprises the touch-switch and normal open switch that are connected in parallel, and one end of described touch-switch is the first end of described switching circuit; The other end of described touch-switch is the second end of described switching circuit, and described normal open switch controls it by described control circuit and closes or open.
As the optional execution mode of one, described control circuit comprises the solenoid of zener diode, power supply changeover device, relay, the first switching tube, second switch pipe, the first resistance, the second resistance and the 3rd resistance, wherein,
The negative pole of described zener diode is connected with the input of described drive circuit, and the positive pole of voltage stabilizing didoe is by the first grounding through resistance;
The input of described power supply changeover device is connected with the negative pole of described voltage stabilizing didoe; The output of power supply changeover device is by the second resistance of being connected in series and the 3rd grounding through resistance;
The base stage of described first switching tube is connected with the positive pole of described voltage stabilizing didoe, the grounded emitter of the first switching tube, and the first switching tube collector electrode is connected with the common node of described second resistance with the 3rd resistance;
The base stage of described second switch pipe is connected with the common node of described second resistance with the 3rd resistance, the grounded emitter of second switch pipe;
The solenoid of described relay is connected between the output of described power supply changeover device and the collector electrode of second switch pipe, normal open switch in described switching circuit is the normal open switch of relay, when being energized in described solenoid, described normal open switch closes, and when described solenoid power-off, described normal open switch is opened.
As the optional execution mode of one, described protective circuit also comprises suppression surge circuit,
Second end of described switching circuit is connected with the first end of described control circuit by described suppression surge circuit.
As the optional execution mode of one, described suppression surge circuit comprises: thermistor,
Described thermosensitive circuit is connected between the second end of described switching circuit and the first end of control circuit.
As the optional execution mode of one, described suppression surge circuit also comprises: metal-oxide-semiconductor, electric capacity, the 3rd switching tube, the 4th resistance, the 5th resistance and the 6th resistance, wherein,
The source electrode of described metal-oxide-semiconductor is connected with the input of described drive circuit, and grid is connected with the collector electrode of described 3rd switching tube, drains to be connected with the second end of described switching circuit;
Described 4th resistance is connected between the drain and gate of described metal-oxide-semiconductor;
One end of described 5th resistance is connected with the drain electrode of metal-oxide-semiconductor, and the other end passes through capacity earth;
Between the base stage that described electric capacity is connected to the 3rd switching tube and emitter;
Described 6th resistance and described Capacitance parallel connection.
As the optional execution mode of one, described metal-oxide-semiconductor is P channel MOS tube.
As the optional execution mode of one, described first switching tube, second switch pipe and the 3rd switch are NPN pipe.
Correspondingly; present invention also offers a kind of lighting apparatus; described lighting apparatus comprises drive circuit, lighting source and above-described protective circuit; first output of described drive circuit is connected with the first end of described lighting source, and the second output of described drive circuit is connected with the second end of described lighting source.
As the optional execution mode of one, described lighting source comprises at least one LED.
The protective circuit that the embodiment of the present invention provides, when the voltage of power supply exceedes threshold voltage corresponding to drive circuit, the connection of drive circuit and power supply disconnects, and makes drive circuit protected.Further; by arranging suppression surge circuit; drive circuit can be avoided because the surge voltage that produces instantaneously of being energized is excessive and burn causing lighting source to be energized; in addition; the embodiment of the present invention is also provided with protection branch road in suppression surge circuit, prevents from suppressing the components and parts in surge circuit to burn because of overheated.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the modular structure schematic diagram that the present invention comprises an embodiment of the lighting apparatus of protective circuit;
Fig. 2 is the modular structure schematic diagram that the present invention comprises the another embodiment of the lighting apparatus of protective circuit;
Fig. 3 is the electrical block diagram that the present invention comprises an embodiment again of the lighting apparatus of protective circuit.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the present invention can disconnect the connection of drive circuit and power supply when the voltage of power supply exceedes threshold voltage corresponding to drive circuit, thus protects the drive circuit of lighting source.
Refer to Fig. 1, Fig. 1 is one embodiment of the present of invention, and comprise the modular structure schematic diagram of the lighting apparatus of protective circuit, this lighting apparatus comprises protective circuit, drive circuit and lighting source.
Wherein, protective circuit comprises: switching circuit and control circuit.Switching circuit is for connecting or disconnecting the connection of drive circuit and power supply, and the first end of switching circuit is connected with power supply, and the second end of switching circuit is connected with the first end of control circuit; Control circuit is used for when the voltage of power supply exceedes threshold voltage corresponding to drive circuit, control switch circuit disconnects the connection of drive circuit and power supply, the first end of control circuit is connected with the input of the second end of switching circuit and drive circuit, the second end ground connection of control circuit.First output of drive circuit is connected with the first end of lighting source, and the second output of drive circuit is connected with the second end of lighting source, the earth terminal ground connection of drive circuit.
As the enforceable mode of one, lighting source comprises three LEDs.
By implementing the lighting apparatus described by Fig. 1, when the voltage of power supply exceedes threshold voltage corresponding to drive circuit, control circuit control switch circuit disconnects the connection of drive circuit and power supply, thus protects drive circuit.
Refer to Fig. 2; Fig. 2 is another embodiment of the present invention, comprises the modular structure schematic diagram of the lighting apparatus of protective circuit, relative to the embodiment shown in Fig. 1; add suppression surge circuit in Fig. 2, the second end of switching circuit is connected with the first end of control circuit by suppressing surge circuit.
As the optional execution mode of one, surge circuit is suppressed to comprise thermistor.The surge voltage that energising moment circuit produces is absorbed by thermistor.
By implementing the lighting apparatus described by Fig. 2, when the voltage of power supply exceedes threshold voltage corresponding to drive circuit, control circuit control switch circuit disconnects the connection of drive circuit and power supply; The surge voltage that drive circuit simultaneously can also be avoided to produce instantaneously because of being energized is excessive and burn.
Refer to Fig. 3, Fig. 3 is another embodiment of the present invention, comprises the electrical block diagram of the lighting apparatus of protective circuit.This lighting apparatus comprises protective circuit, drive circuit 4 and lighting source 5, and wherein, protective circuit comprises: switching circuit 1, suppression surge circuit 2 and control circuit 3.Switching circuit 1 is for connecting or disconnecting the connection of drive circuit 4 and power supply, and comprise the touch-switch S1 and normal open switch K-1 that are connected in parallel, normal open switch K-1 is the normal open switch of relay K 1.Normal open switch K-1 is energized by the solenoid of control circuit 3 repeat circuit K1 or power-off controls, and when solenoid is energized and obtains electric, normal open switch K-1 closes, and when solenoid power-off and dead electricity, normal open switch K-1 opens; First output of drive circuit 4 is connected with the first end of lighting source 5, and the second output of drive circuit 4 is connected with the second end of lighting source 5.
As the enforceable mode of one, control circuit 3 comprises the solenoid of zener diode ZD1, power supply changeover device U1, relay k1, first switching tube Q1, second switch pipe Q2, the first resistance R1, the second resistance R2 and the 3rd resistance R3, wherein, the first switching tube Q1 and second switch pipe Q2 is NPN pipe.
The negative pole of zener diode ZD1 is connected with the input of drive circuit 4, and the positive pole of voltage stabilizing didoe ZD1 is by the first resistance R1 ground connection.
The input Vin of power supply changeover device U1 is connected with the negative pole of voltage stabilizing didoe ZD1; The output end vo ut of power supply changeover device U1 is by the second resistance R2 of being connected in series and the 3rd resistance R3 ground connection; The ground end GND ground connection of power supply changeover device U1.
The base stage of the first switching tube Q1 is connected with the positive pole of voltage stabilizing didoe ZD1, the grounded emitter of the first switching tube Q1, and the collector electrode of the first switching tube Q1 is connected with the common node of the 3rd resistance R3 with the second resistance R2.
The base stage of second switch pipe Q2 is connected with the common node of the 3rd resistance R3 with the second resistance R2, the grounded emitter of second switch pipe.
The solenoid of relay K 1 is connected between the output end vo ut of power supply changeover device and the collector electrode of second switch pipe Q2, and the normal open switch in switching circuit is the normal open switch of relay.The solenoid of control relay K1 obtains electric or dead electricity and both can control normal open switch K-1 and close or open.
Burn in order to avoid drive circuit because the surge voltage that produces instantaneously of being energized is excessive; as the enforceable mode of one; protective circuit also comprises and suppresses surge circuit 2; surge circuit 2 is suppressed to comprise thermistor RT; the first end of thermistor RT is connected with the second end of switching circuit 1; second end of thermistor RT is connected with the input of drive circuit 4, and the surge voltage that energising moment circuit produces is absorbed by thermistor RT.
Work to prevent thermistor RT and cause overheated too for a long time and burn, as the enforceable mode of one, suppress surge circuit also to comprise the protection branch road of thermistor RT.The protection branch road of thermistor RT comprises: P channel MOS tube Q4, electric capacity C1, the 3rd switching tube Q3, the 4th resistance R4, the 5th resistance R5 and the 6th resistance R6, wherein, 3rd switching tube Q3 is NPN triode, the source electrode of metal-oxide-semiconductor Q4 is connected with the input of drive circuit 4, grid is connected with the collector electrode of the 3rd switching tube Q3, drains to be connected with the second end of switching circuit 1; 4th resistance R4 is connected between the drain and gate of metal-oxide-semiconductor Q4; One end of 5th resistance R5 is connected with the drain electrode of metal-oxide-semiconductor Q4, and the other end is by electric capacity C1 ground connection; Between the base stage that electric capacity C1 is connected to the 3rd switching tube Q3 and emitter; 6th resistance R6 is in parallel with electric capacity C1.
The operation principle of the present embodiment is as follows:
In the present embodiment, the operating voltage of hypothesis driven circuit 4 is 36V, and the threshold voltage of drive circuit 4 correspondence is 42V, when supply voltage is more than 42V, wishes that the normal open switch K-1 in switching circuit 1 opens, and cuts off the connection of drive circuit and power supply.Suppose that the operating voltage of relay K 1 be 12V, U1 is the power supply changeover device that 36V turns 12V, the burning voltage of voltage-stabiliser tube ZD1 is 42V, and certainly for different circuit, above-mentioned magnitude of voltage can be different.
When the voltage of power supply is the operating voltage 36V of drive circuit 4, press touch-switch S1, start-up circuit.The surge voltage that circuit turn-on produces instantaneously is absorbed by thermistor RT.Conducting moment, power supply is charged to electric capacity C1 by the 5th resistance R5, and now the voltage at electric capacity C1 two ends is lower, the 3rd switching tube Q3 also non-conducting.Along with electric capacity C1 both end voltage raises gradually, the 3rd opens the light pipe Q3 conducting, and the grid of metal-oxide-semiconductor Q4 becomes low-voltage, metal-oxide-semiconductor Q4 conducting, thus can protect thermistor RT, prevents thermistor RT from burning because temperature is too high.Simultaneously, power supply is that relay K 1 is powered by power supply changeover device U1, the output end vo ut output voltage of power supply changeover device U1, make second switch pipe Q2 conducting by the dividing potential drop of the second resistance R2 and the 3rd resistance R3, the solenoid of relay K 1 obtains electric, and then the normal open switch K-1 of control relay K1 closes, even if so touch-switch S1 unclamps, because normal open switch K-1 closes, drive circuit 4 still can normally work, and drive circuit 4 drives lighting source 5 luminous.
When supply voltage exceedes the threshold voltage 42V of drive circuit 4 correspondence, such as when power supply is 43V, now voltage-stabiliser tube ZD1 conducting, the voltage at the first resistance R1 two ends makes the first switching tube Q1 conducting, and the base potential of second switch pipe Q2 is dragged down, and second switch pipe Q2 ends, the solenoid dead electricity of relay K 1, and then the normal open switch K-1 of relay K 1 is opened, cut off the connection of drive circuit 4 and power supply, thus prevent drive circuit 4 to be damaged because of high voltage.
Device embodiment described above is only schematic, wherein normal open switch K-1 and solenoid are two parts of same relay, they are relevant associations, obtain electric or dead electricity by controlling solenoid can to control normal open switch closed or open.
Adopt the present embodiment, when the voltage of power supply exceedes threshold voltage corresponding to drive circuit, the connection of drive circuit and power supply disconnects, and makes drive circuit protected.Further; by arranging suppression surge circuit; drive circuit can be avoided because the surge voltage that produces instantaneously of being energized is excessive and burn causing lighting source to be energized; in addition; the embodiment of the present invention is also provided with protection branch road in suppression surge circuit, prevents from suppressing the components and parts in surge circuit to burn because of overheated.
Above-described execution mode, does not form the restriction to this technical scheme protection range.The amendment done within any spirit at above-mentioned execution mode and principle, equivalently to replace and improvement etc., within the protection range that all should be included in this technical scheme.
Claims (10)
1. a protective circuit, is connected between power supply and drive circuit, it is characterized in that, this protective circuit comprises: switching circuit and control circuit;
Described switching circuit is for connecting or disconnecting the connection of described drive circuit and power supply, and the first end of described switching circuit is connected with described power supply, and the second end of described switching circuit is connected with the first end of described control circuit;
Described control circuit is used for when the voltage of described power supply exceedes threshold voltage corresponding to described drive circuit, control the connection that described switching circuit disconnects described drive circuit and power supply, the first end of described control circuit is connected with the second end of described switching circuit, the second end ground connection of described control circuit, and the first end of described control circuit is also connected with the input of described drive circuit.
2. protective circuit according to claim 1, is characterized in that, described switching circuit comprises the touch-switch and normal open switch that are connected in parallel, and one end of described touch-switch is the first end of described switching circuit; The other end of described touch-switch is the second end of described switching circuit, and described normal open switch controls it by described control circuit and closes or open.
3. protective circuit according to claim 2, is characterized in that, described control circuit comprises the solenoid of zener diode, power supply changeover device, relay, the first switching tube, second switch pipe, the first resistance, the second resistance and the 3rd resistance, wherein,
The negative pole of described zener diode is connected with the input of described drive circuit, and the positive pole of voltage stabilizing didoe is by the first grounding through resistance;
The input of described power supply changeover device is connected with the negative pole of described voltage stabilizing didoe; The output of power supply changeover device is by the second resistance of being connected in series and the 3rd grounding through resistance;
The base stage of described first switching tube is connected with the positive pole of described voltage stabilizing didoe, the grounded emitter of the first switching tube, and the first switching tube collector electrode is connected with the common node of described second resistance with the 3rd resistance;
The base stage of described second switch pipe is connected with the common node of described second resistance with the 3rd resistance, the grounded emitter of second switch pipe;
The solenoid of described relay is connected between the output of described power supply changeover device and the collector electrode of second switch pipe, normal open switch in described switching circuit is the normal open switch of relay, when being energized in described solenoid, described normal open switch closes, and when described solenoid power-off, described normal open switch is opened.
4. protective circuit according to claim 3, is characterized in that, described protective circuit also comprises suppression surge circuit,
Second end of described switching circuit is connected with the first end of described control circuit by described suppression surge circuit.
5. protective circuit according to claim 4, is characterized in that, described suppression surge circuit comprises: thermistor,
Described thermosensitive circuit is connected between the second end of described switching circuit and the first end of control circuit.
6. protective circuit according to claim 5, is characterized in that, described suppression surge circuit also comprises: metal-oxide-semiconductor, electric capacity, the 3rd switching tube, the 4th resistance, the 5th resistance and the 6th resistance, wherein,
The source electrode of described metal-oxide-semiconductor is connected with the input of described drive circuit, and grid is connected with the collector electrode of described 3rd switching tube, drains to be connected with the second end of described switching circuit;
Described 4th resistance is connected between the drain and gate of described metal-oxide-semiconductor;
One end of described 5th resistance is connected with the drain electrode of metal-oxide-semiconductor, and the other end passes through capacity earth;
Between the base stage that described electric capacity is connected to the 3rd switching tube and emitter;
Described 6th resistance and described Capacitance parallel connection.
7. protective circuit according to claim 6, is characterized in that,
Described metal-oxide-semiconductor is P channel MOS tube.
8. protective circuit according to claim 7, is characterized in that, described first switching tube, second switch pipe and the 3rd switch are NPN pipe.
9. a lighting apparatus; it is characterized in that; described lighting apparatus comprises drive circuit, lighting source and the protective circuit described in claim 1-8 any one; first output of described drive circuit is connected with the first end of described lighting source, and the second output of described drive circuit is connected with the second end of described lighting source.
10. lighting apparatus according to claim 9, is characterized in that, described lighting source comprises at least one LED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310616128.6A CN104682338B (en) | 2013-11-27 | 2013-11-27 | A kind of protection circuit and lighting apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310616128.6A CN104682338B (en) | 2013-11-27 | 2013-11-27 | A kind of protection circuit and lighting apparatus |
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| CN104682338A true CN104682338A (en) | 2015-06-03 |
| CN104682338B CN104682338B (en) | 2018-11-27 |
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| CN201310616128.6A Active CN104682338B (en) | 2013-11-27 | 2013-11-27 | A kind of protection circuit and lighting apparatus |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107528453A (en) * | 2017-08-14 | 2017-12-29 | 珠海格力电器股份有限公司 | Drive control circuit and air conditioner |
| CN109004634A (en) * | 2018-07-27 | 2018-12-14 | 惠州市华阳光电技术有限公司 | A kind of circuit inhibiting light modulator surge current |
| CN109915797A (en) * | 2017-12-11 | 2019-06-21 | 朗德万斯公司 | Electronic driver and LED light for LED illumination mould group |
| WO2021196984A1 (en) * | 2020-03-30 | 2021-10-07 | 晨辉光宝科技股份有限公司 | Led driving circuit, lamp tube and illumination apparatus |
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| CN101841149A (en) * | 2010-05-11 | 2010-09-22 | 海洋王照明科技股份有限公司 | Power source protection circuit and LED lamp |
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| CN102612197A (en) * | 2011-01-20 | 2012-07-25 | 海洋王照明科技股份有限公司 | LED (light emitting diode) driving circuit and LED lamp using same |
| CN102711308A (en) * | 2011-03-28 | 2012-10-03 | 海洋王照明科技股份有限公司 | LED (Light Emitting Diode) drive circuit and lamp |
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| CN101841149A (en) * | 2010-05-11 | 2010-09-22 | 海洋王照明科技股份有限公司 | Power source protection circuit and LED lamp |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107528453A (en) * | 2017-08-14 | 2017-12-29 | 珠海格力电器股份有限公司 | Drive control circuit and air conditioner |
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| CN109915797A (en) * | 2017-12-11 | 2019-06-21 | 朗德万斯公司 | Electronic driver and LED light for LED illumination mould group |
| CN109915797B (en) * | 2017-12-11 | 2021-11-30 | 朗德万斯公司 | Electronic driver for LED lighting module and LED lamp |
| CN109004634A (en) * | 2018-07-27 | 2018-12-14 | 惠州市华阳光电技术有限公司 | A kind of circuit inhibiting light modulator surge current |
| WO2021196984A1 (en) * | 2020-03-30 | 2021-10-07 | 晨辉光宝科技股份有限公司 | Led driving circuit, lamp tube and illumination apparatus |
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| CN104682338B (en) | 2018-11-27 |
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