CN103311879A - Large-power LED (Light-Emitting Diode) driver and boosting converter protection circuit thereof - Google Patents
Large-power LED (Light-Emitting Diode) driver and boosting converter protection circuit thereof Download PDFInfo
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Abstract
The invention provides a boosting converter protection circuit. The boosting converter protection circuit comprises a comparator, a standard voltage generation module, a first electronic switch, a second electronic switch, a first resistor and a current detection module, wherein a same-phase end of the comparator is connected with a direct-current power supply through the standard voltage generation module; an opposite-phase end of the comparator is connected with an output end of the second electronic switch; an output end of the comparator is connected with a control end of the first electronic switch; an input end of the first electronic switch is connected with a control end of the second electronic switch; an output end of the first electronic switch is grounded; the control end of the second electronic switch is connected with the direct-current power supply; an output end of the second electronic switch is grounded through the current detection module; the output end of the second electronic switch is connected with the control end of the second electronic switch through the first resistor; and an input end of the second electronic switch is connected with a large-power LED (Light-Emitting Diode) assembly. The boosting converter protection circuit disclosed by the invention can be used for carrying out short-circuit and over-current protection on a boosting converter. The invention further relates to a large-power LED driver.
Description
Technical field
The present invention relates to a kind of high-power LED driver and booster converter protective circuit thereof.
Background technology
The LED street lamp generally adopts the great power LED assembly as light source, and it is driven by led driver, and led driver generally comprises booster converter (BOOST converter) and rectification circuit.When short trouble appearred in the great power LED assembly, the large electric current that load short circuits produces was excessive, easily burns converter, can cause power supply on fire when serious, thereby cause fire, had great potential safety hazard.
Summary of the invention
For the deficiencies in the prior art, purpose of the present invention is intended to provide a kind of high-power LED driver and booster converter protective circuit thereof, and it carries out overcurrent protection to booster converter.
For achieving the above object, the present invention adopts following technical scheme:
A kind of booster converter protective circuit, it comprises comparator, the reference voltage generation module for generation of a reference voltage, the first electronic switch, the second electronic switch, the first resistance and current detection module; The end of oppisite phase of this comparator connects a direct current power supply by the reference voltage generation module, and the in-phase end of this comparator connects the output of the second electronic switch, and the output of this comparator connects the control end of the first electronic switch; The input of this first electronic switch connects the control end of this second electronic switch, the output head grounding of this first electronic switch; The control end of this second electronic switch connects this DC power supply, the output of this second electronic switch is by current detection module ground connection, the output of this second electronic switch connects the control end of the second electronic switch by the first resistance, the input of this second electronic switch connects the voltage output end of load, and the voltage input end of load is connected DC power supply by rectification circuit with boost conversion circuit; Wherein, when the control end of the first electronic switch receives high level signal, conducting between the input of this first electronic switch and the output when the control end of the first electronic switch receives low level signal, ends between the input of this electronic switch and the output; When the control end of the second electronic switch receives high level signal, conducting between the input of this second electronic switch and the output, when the control end of the second electronic switch receives low level signal, end between the input of this second electronic switch and the output.
The reference voltage generation module comprises voltage-stabiliser tube, the second resistance, the 3rd resistance and the 4th resistance; By this second resistance, the 3rd resistance and the 4th grounding through resistance, the end of oppisite phase of this comparator is connected in the dividing point of the 3rd resistance and the 4th resistance to this DC power supply successively; The negative electrode of this voltage-stabiliser tube connects the node between the second resistance and the 3rd resistance, the plus earth of this voltage-stabiliser tube.
Current detection module comprises the 5th resistance and the 6th resistance; The output of this second electronic switch is by the 5th grounding through resistance, also by the 6th grounding through resistance.
This first electronic switch is triode, and the control end of this first electronic switch is the base stage of triode, and the input of this first electronic switch is the collector electrode of triode, and the input of this first electronic switch is the emitter of triode.
This booster converter protective circuit also comprises the 7th resistance, the 8th resistance and the first electric capacity; The output of this comparator is by the base stage of the 7th resistance connecting triode, and the base stage of this triode is by the 8th resistance and the first capacity earth, and the in-phase end of this comparator connects the node between the 8th resistance and the first electric capacity.
This second electronic switch is field effect transistor, and the control end of this second electronic switch is the grid of field effect transistor, and the input of this second electronic switch is the drain electrode of field effect transistor, and the output of this second electronic switch is the source electrode of field effect transistor.
This booster converter protective circuit also comprises the 9th resistance to the 11 resistance, the second electric capacity and the 3rd electric capacity; The grid of this field effect transistor connects this DC power supply by the 9th resistance; The in-phase end of this comparator connects node between the second resistance and the 3rd resistance by the tenth resistance, also connects the output of the second electronic switch by the 11 resistance; The in-phase end of this comparator is also by the second capacity earth; The end of oppisite phase of this comparator connects node between the second resistance and the 3rd resistance by the 3rd electric capacity.
The present invention also comprises following technical scheme:
A kind of high-power LED driver, it comprises boost conversion circuit, rectification circuit, protective circuit, pwm control circuit and constant-current circuit; The booster converter protective circuit comprises comparator, the reference voltage generation module for generation of a reference voltage, the first electronic switch, the second electronic switch, the first resistance and current detection module; The end of oppisite phase of this comparator connects a direct current power supply by the reference voltage generation module, and the in-phase end of this comparator connects the output of the second electronic switch, and the output of this comparator connects the control end of the first electronic switch; The input of this first electronic switch connects the control end of this second electronic switch, the output head grounding of this first electronic switch; The control end of this second electronic switch connects this DC power supply, the output of this second electronic switch is by current detection module ground connection, the output of this second electronic switch connects the control end of the second electronic switch by the first resistance, the input of this second electronic switch connects the voltage output end of great power LED assembly, and the voltage input end of great power LED assembly is connected DC power supply by rectification circuit with boost conversion circuit; Wherein, when the control end of the first electronic switch receives high level signal, conducting between the input of this first electronic switch and the output when the control end of the first electronic switch receives low level signal, ends between the input of this electronic switch and the output; When the control end of the second electronic switch receives high level signal, conducting between the input of this second electronic switch and the output, when the control end of the second electronic switch receives low level signal, end between the input of this second electronic switch and the output; The output of this second electronic switch is connected pwm control circuit by current detection module with constant-current circuit.
The reference voltage generation module comprises voltage-stabiliser tube, the second resistance, the 3rd resistance and the 4th resistance; Current detection module comprises the 5th resistance and the 6th resistance; By this second resistance, the 3rd resistance and the 4th grounding through resistance, the end of oppisite phase of this comparator is connected in the node between the 3rd resistance and the 4th resistance to this DC power supply successively; The negative electrode of this voltage-stabiliser tube connects the node between the second resistance and the 3rd resistance, the plus earth of this voltage-stabiliser tube; The output of this second electronic switch is by the 5th grounding through resistance, also by the 6th grounding through resistance.
This first electronic switch is triode, and the control end of this first electronic switch is the base stage of triode, and the input of this first electronic switch is the collector electrode of triode, and the input of this first electronic switch is the emitter of triode;
This booster converter protective circuit also comprises the 7th resistance, the 8th resistance and the first electric capacity; The output of this comparator is by the base stage of the 7th resistance connecting triode, and the base stage of this triode is by the 8th resistance and the first capacity earth, and the in-phase end of this comparator connects the node between the 8th resistance and the first electric capacity;
This second electronic switch is field effect transistor, and the control end of this second electronic switch is the grid of field effect transistor, and the input of this second electronic switch is the drain electrode of field effect transistor, and the output of this second electronic switch is the source electrode of field effect transistor;
This booster converter protective circuit also comprises the 9th resistance to the 11 resistance, the second electric capacity and the 3rd electric capacity; The grid of this field effect transistor connects this DC power supply by the 9th resistance; The in-phase end of this comparator connects node between the second resistance and the 3rd resistance by the tenth resistance, also connects the output of the second electronic switch by the 11 resistance; The in-phase end of this comparator is also by the second capacity earth; The end of oppisite phase of this comparator connects node between the second resistance and the 3rd resistance by the 3rd electric capacity.
Boost conversion circuit comprises inductance, field effect transistor and the second resistance; AC power connects the drain electrode of field effect transistor by inductance, the grid of field effect transistor is by the second grounding through resistance, the source ground of field effect transistor.
Rectification circuit comprises electric capacity, the second resistance and diode; One end of electric capacity connects the drain electrode of field effect transistor, and the other end of electric capacity connects the negative electrode of diode by resistance, also connects the voltage input end of great power LED assembly, the drain electrode of the anodic bonding field effect transistor of diode.
Pwm control circuit comprises the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the first electric capacity to the three electric capacity, the first diode, the second diode and processor; The relatively end of this processor connects its feedback end by the 3rd resistance with the 3rd electric capacity, also connects the anode of the first diode, the anodic bonding constant-current circuit of the first diode; The test side of processor is by the 8th grounding through resistance, also connect its clock end by the 7th resistance, the clock end of this processor also connects its reference voltage terminal by the 6th resistance by the first capacity earth, the voltage end of this processor connects DC power supply by resistance, also passes through capacity earth; The output of this processor also connects the negative electrode of the second diode, the source electrode of the anodic bonding field effect transistor of the second diode by the source electrode of the field effect transistor of the connection boost conversion circuit of the 3rd resistance.
This constant-current circuit comprises the second comparator, electric capacity, the second resistance to the six resistance; The output of this second comparator connects pwm control circuit, the in-phase end of this second comparator connects the reference voltage terminal of the processor of pwm control circuit by the 3rd resistance, also by the 6th resistance and the 5th grounding through resistance, the end of oppisite phase of this second comparator connects the source electrode of field effect transistor by the 4th resistance, also be connected the output of the second comparator with electric capacity by the second resistance.
Beneficial effect of the present invention is as follows:
Foregoing invention short trouble occurs or because pwm control circuit when losing efficacy at load such as great power LED assembly, the large electric current that produces flows the second electronic switch, so that the voltage instantaneous of current detection module raises, this high voltage inputs to the in-phase end of comparator, at this moment, because the voltage of the in-phase end of comparator is greater than the reference voltage of end of oppisite phase, the control end of output output high level signal to the first electronic switch of this comparator, so that the first electronic switch conducting, and then the control end of the second electronic switch dragged down ground connection, thereby so that the second electronic switch cut-off, the high voltage of current detection module will pass through the first electronic switch inflow place moment, so, the large electric current that can avoid continuing burns boost conversion circuit.
The high voltage transient of current detection module is by behind the first electronic switch inflow place, because the voltage of the end of oppisite phase of this comparator is greater than the voltage of in-phase end, the control end of output output low level signal to the first electronic switch of this comparator, so that the first electronic switch cut-off, and then so that the control end of the second electronic switch is pulled to DC power supply, so that the second electronic switch conducting, thereby so that great power LED component recovery normal operation.
Description of drawings
Fig. 1 is the module diagram of the better embodiment of high-power LED driver of the present invention;
Fig. 2 is the circuit diagram of the high-power LED driver of Fig. 1.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described further:
See also Fig. 1 and Fig. 2, the present invention relates to a kind of high-power LED driver, its better embodiment comprises boost conversion circuit 30, rectification circuit 40, protective circuit 50, pwm control circuit 20 and constant-current circuit 60.
This boost conversion circuit 30 comprises that comparator U2, triode Q2, field effect transistor Q3, voltage-stabiliser tube ZD1, resistance R 8 to R17, resistance R 30 and capacitor C 4 are to C5.
The end of oppisite phase of this comparator U2 is connected with resistance R by resistance R 8 and is connected a direct current power supply VCC, and also by resistance R 9 ground connection, the end of oppisite phase of this comparator U2 is also by the node between capacitor C 6 contact resistance R8 and the resistance R 14.The in-phase end of this comparator U2 also connects the source electrode of field effect transistor Q3 by the node between resistance R 10 contact resistance R8 and the resistance R 14 by resistance R 11, the in-phase end of this comparator U2 is also by capacitor C 4 ground connection, also by capacitor C 5 ground connection.The negative electrode contact resistance R8 of voltage-stabiliser tube ZD1 and the node between the resistance R 14, the plus earth of voltage-stabiliser tube ZD1.The output of this comparator U2 is by the base stage of resistance R 13 connecting triode Q2, the base stage of triode Q2 connects the in-phase end of this comparator U2 by resistance R 12, the source ground of triode Q2, the collector electrode of triode Q2 connects this DC power supply VCC by resistance R 15, the source electrode that also connects field effect transistor Q3 by resistance R 16, the source electrode of field effect transistor Q3 is by resistance R 17 ground connection, and also by resistance R 30 ground connection, the drain electrode of field effect transistor Q3 connects the voltage output end of great power LED assembly 70.The voltage input end of this great power LED assembly 70 is connected with boost conversion circuit by rectification circuit 40 successively and is connected an AC power.The source electrode of this field effect transistor Q3 also connects pwm control circuit 20 by constant-current circuit 60.
The great power LED assembly occur short trouble or since the moment that pwm control circuit 20 lost efficacy may produce large electric current, this large electric current field effect transistor Q3 that flows through, so that the voltage signal moment rising of resistance R 17 and resistance R 30, this high voltage signal inputs to the in-phase end of comparator U2 by resistance R 11, at this moment, because the voltage of the in-phase end of comparator U2 is greater than the voltage of end of oppisite phase, the output output high level signal of this comparator U2 is to the base stage of triode Q2, so that triode Q2 conducting, and then the grid of field effect transistor Q3 dragged down ground connection, thereby so that field effect transistor Q3 cut-off, resistance R 17 and resistance R 30 are used for current detecting, the Voltage Feedback that top overcurrent produces is to comparator U2 and pwm control circuit 20, and so, the large electric current that can avoid continuing burns boost conversion circuit 30.
Flowing through the pressure drop that the electric current of resistance R 17 and resistance R 30 produces is voltage signal, because the voltage of the end of oppisite phase of this comparator U2 is greater than the voltage of in-phase end, the output output low level signal of this comparator U2 is to the base stage of triode Q2, so that triode Q2 cut-off, and then so that the grid of field effect transistor Q3 is pulled to DC power supply VCC, so that field effect transistor Q3 conducting, thereby so that great power LED component recovery normal operation.
In the present embodiment, voltage-stabiliser tube ZD1, resistance R 8, resistance R 9 and resistance R 14 consist of a reference voltage generation module for generation of reference voltage.Among other embodiment, this reference voltage generation module can by some resistance with series connection or/and mode in parallel obtain, to produce the reference voltage of actual needs.
Resistance R 17 and resistance R 30 consists of a current detection module for detection of instantaneous large-current, among other embodiment, the large electric current that this current detection module can detect as required by some resistance with series connection or/and mode in parallel form.
This triode Q2 can be other electronic switch such as field effect transistor, even other electronic switch chips, the control end of electronic switch is equivalent to the base stage of triode Q2, and the input of electronic switch is equivalent to the collector electrode of triode Q2, and the output of electronic switch is equivalent to the emitter of triode Q2.When the control end of electronic switch received high level signal, conducting between the input of this electronic switch and the output when the control end of electronic switch receives low level signal, ended between the input of this electronic switch and the output.
This field effect transistor Q3 can be other electronic switch such as triode, even other electronic switch chips, the control end of electronic switch is equivalent to the grid of field effect transistor Q3, and the input of electronic switch is equivalent to the drain electrode of field effect transistor Q3, and the output of electronic switch is equivalent to the source electrode of field effect transistor Q3.When the control end of electronic switch received high level signal, conducting between the input of this electronic switch and the output when the control end of electronic switch receives low level signal, ended between the input of this electronic switch and the output.The conducting of electronic switch and cut-off frequency depend on the self check frequency of oscillation of in-phase end voltage signal on current detection module of comparator U2, thereby when the PWM booster circuit partly breaks down, also can keep the linear current on the electronic switch constant.
This constant-current circuit 60 comprises that comparator U3, capacitor C 9, resistance R 21 are to R25.The output of this comparator U3 connects the negative electrode of the diode D3 of pwm control circuit 20, the in-phase end of this comparator U3 connects the reference voltage terminal VREF of the processor U1 of pwm control circuit 20 by resistance R 22, also by resistance 25 and resistance R 24 ground connection, the end of oppisite phase of this comparator U3 connects the source electrode of field effect transistor Q3 by resistance R 23, also are connected the output that connects comparator U3 with capacitor C by resistance R 21.
For a person skilled in the art, can make other various corresponding changes and distortion according to technical scheme described above and design, and these all changes and distortion should belong within the protection range of claim of the present invention all.
Claims (14)
1. booster converter protective circuit, it is characterized in that: it comprises comparator, the reference voltage generation module for generation of a reference voltage, the first electronic switch, the second electronic switch, the first resistance and current detection module; The end of oppisite phase of this comparator connects a direct current power supply by the reference voltage generation module, and the in-phase end of this comparator connects the output of the second electronic switch, and the output of this comparator connects the control end of the first electronic switch; The input of this first electronic switch connects the control end of this second electronic switch, the output head grounding of this first electronic switch; The control end of this second electronic switch connects this DC power supply, the output of this second electronic switch is by current detection module ground connection, the output of this second electronic switch connects the control end of the second electronic switch by the first resistance, the input of this second electronic switch connects the voltage output end of load, and the voltage input end of load is connected DC power supply by rectification circuit with boost conversion circuit; Wherein, when the control end of the first electronic switch receives high level signal, conducting between the input of this first electronic switch and the output when the control end of the first electronic switch receives low level signal, ends between the input of this electronic switch and the output; When the control end of the second electronic switch receives high level signal, conducting between the input of this second electronic switch and the output, when the control end of the second electronic switch receives low level signal, end between the input of this second electronic switch and the output.
2. booster converter protective circuit as claimed in claim 1, it is characterized in that: the reference voltage generation module comprises voltage-stabiliser tube, the second resistance, the 3rd resistance and the 4th resistance; By this second resistance, the 3rd resistance and the 4th grounding through resistance, the end of oppisite phase of this comparator is connected in the dividing point of the 3rd resistance and the 4th resistance to this DC power supply successively; The negative electrode of this voltage-stabiliser tube connects the node between the second resistance and the 3rd resistance, the plus earth of this voltage-stabiliser tube.
3. booster converter protective circuit as claimed in claim 2, it is characterized in that: current detection module comprises the 5th resistance and the 6th resistance; The output of this second electronic switch is by the 5th grounding through resistance, also by the 6th grounding through resistance.
4. such as claim 1,2 or 3 described booster converter protective circuits; it is characterized in that: this first electronic switch is triode; the control end of this first electronic switch is the base stage of triode; the input of this first electronic switch is the collector electrode of triode, and the input of this first electronic switch is the emitter of triode.
5. booster converter protective circuit as claimed in claim 4, it is characterized in that: this booster converter protective circuit also comprises the 7th resistance, the 8th resistance and the first electric capacity; The output of this comparator is by the base stage of the 7th resistance connecting triode, and the base stage of this triode is by the 8th resistance and the first capacity earth, and the in-phase end of this comparator connects the node between the 8th resistance and the first electric capacity.
6. such as claim 1,2 or 3 described booster converter protective circuits; it is characterized in that: this second electronic switch is field effect transistor; the control end of this second electronic switch is the grid of field effect transistor; the input of this second electronic switch is the drain electrode of field effect transistor, and the output of this second electronic switch is the source electrode of field effect transistor.
7. booster converter protective circuit as claimed in claim 6, it is characterized in that: this booster converter protective circuit also comprises the 9th resistance to the 11 resistance, the second electric capacity and the 3rd electric capacity; The grid of this field effect transistor connects this DC power supply by the 9th resistance; The in-phase end of this comparator connects node between the second resistance and the 3rd resistance by the tenth resistance, also connects the output of the second electronic switch by the 11 resistance; The in-phase end of this comparator is also by the second capacity earth; The end of oppisite phase of this comparator connects node between the second resistance and the 3rd resistance by the 3rd electric capacity.
8. high-power LED driver, it is characterized in that: it comprises boost conversion circuit, rectification circuit, protective circuit, pwm control circuit and constant-current circuit; The booster converter protective circuit comprises comparator, the reference voltage generation module for generation of a reference voltage, the first electronic switch, the second electronic switch, the first resistance and current detection module; The end of oppisite phase of this comparator connects a direct current power supply by the reference voltage generation module, and the in-phase end of this comparator connects the output of the second electronic switch, and the output of this comparator connects the control end of the first electronic switch; The input of this first electronic switch connects the control end of this second electronic switch, the output head grounding of this first electronic switch; The control end of this second electronic switch connects this DC power supply, the output of this second electronic switch is by current detection module ground connection, the output of this second electronic switch connects the control end of the second electronic switch by the first resistance, the input of this second electronic switch connects the voltage output end of great power LED assembly, and the voltage input end of great power LED assembly is connected DC power supply by rectification circuit with boost conversion circuit; Wherein, when the control end of the first electronic switch receives high level signal, conducting between the input of this first electronic switch and the output when the control end of the first electronic switch receives low level signal, ends between the input of this electronic switch and the output; When the control end of the second electronic switch receives high level signal, conducting between the input of this second electronic switch and the output, when the control end of the second electronic switch receives low level signal, end between the input of this second electronic switch and the output; The output of this second electronic switch is connected pwm control circuit by current detection module with constant-current circuit.
9. high-power LED driver as claimed in claim 10, it is characterized in that: the reference voltage generation module comprises voltage-stabiliser tube, the second resistance, the 3rd resistance and the 4th resistance; Current detection module comprises the 5th resistance and the 6th resistance; By this second resistance, the 3rd resistance and the 4th grounding through resistance, the end of oppisite phase of this comparator is connected in the node between the 3rd resistance and the 4th resistance to this DC power supply successively; The negative electrode of this voltage-stabiliser tube connects the node between the second resistance and the 3rd resistance, the plus earth of this voltage-stabiliser tube; The output of this second electronic switch is by the 5th grounding through resistance, also by the 6th grounding through resistance.
10. high-power LED driver as claimed in claim 9, it is characterized in that: this first electronic switch is triode, the control end of this first electronic switch is the base stage of triode, the input of this first electronic switch is the collector electrode of triode, and the input of this first electronic switch is the emitter of triode;
This booster converter protective circuit also comprises the 7th resistance, the 8th resistance and the first electric capacity; The output of this comparator is by the base stage of the 7th resistance connecting triode, and the base stage of this triode is by the 8th resistance and the first capacity earth, and the in-phase end of this comparator connects the node between the 8th resistance and the first electric capacity;
This second electronic switch is field effect transistor, and the control end of this second electronic switch is the grid of field effect transistor, and the input of this second electronic switch is the drain electrode of field effect transistor, and the output of this second electronic switch is the source electrode of field effect transistor;
This booster converter protective circuit also comprises the 9th resistance to the 11 resistance, the second electric capacity and the 3rd electric capacity; The grid of this field effect transistor connects this DC power supply by the 9th resistance; The in-phase end of this comparator connects node between the second resistance and the 3rd resistance by the tenth resistance, also connects the output of the second electronic switch by the 11 resistance; The in-phase end of this comparator is also by the second capacity earth; The end of oppisite phase of this comparator connects node between the second resistance and the 3rd resistance by the 3rd electric capacity.
11. high-power LED driver as claimed in claim 8 is characterized in that: boost conversion circuit comprises inductance, field effect transistor and the second resistance; AC power connects the drain electrode of field effect transistor by inductance, the grid of field effect transistor is by the second grounding through resistance, the source ground of field effect transistor.
12. high-power LED driver as claimed in claim 8 is characterized in that: rectification circuit comprises electric capacity, the second resistance and diode; One end of electric capacity connects the drain electrode of field effect transistor, and the other end of electric capacity connects the negative electrode of diode by resistance, also connects the voltage input end of great power LED assembly, the drain electrode of the anodic bonding field effect transistor of diode.
13. high-power LED driver as claimed in claim 8 is characterized in that: pwm control circuit comprises the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the first electric capacity to the three electric capacity, the first diode, the second diode and processor; The relatively end of this processor connects its feedback end by the 3rd resistance with the 3rd electric capacity, also connects the anode of the first diode, the anodic bonding constant-current circuit of the first diode; The test side of processor is by the 8th grounding through resistance, also connect its clock end by the 7th resistance, the clock end of this processor also connects its reference voltage terminal by the 6th resistance by the first capacity earth, the voltage end of this processor connects DC power supply by resistance, also passes through capacity earth; The output of this processor also connects the negative electrode of the second diode, the source electrode of the anodic bonding field effect transistor of the second diode by the source electrode of the field effect transistor of the connection boost conversion circuit of the 3rd resistance.
14. high-power LED driver as claimed in claim 8 is characterized in that: this constant-current circuit comprises the second comparator, electric capacity, the second resistance to the six resistance; The output of this second comparator connects pwm control circuit, the in-phase end of this second comparator connects the reference voltage terminal of the processor of pwm control circuit by the 3rd resistance, also by the 6th resistance and the 5th grounding through resistance, the end of oppisite phase of this second comparator connects the source electrode of field effect transistor by the 4th resistance, also be connected the output of the second comparator with electric capacity by the second resistance.
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| CN108151775A (en) * | 2016-12-05 | 2018-06-12 | 株式会社三丰 | The light source of encoder and encoder |
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| WO2008089539A1 (en) * | 2007-01-22 | 2008-07-31 | Power Integrations, Inc. | Control arrangement for a pfc-pwm power converter |
| CN101431845A (en) * | 2007-11-05 | 2009-05-13 | 深圳桑达百利电器有限公司 | Driving method and circuit for LED lamp string |
| CN102740535A (en) * | 2011-04-12 | 2012-10-17 | 青岛海信电器股份有限公司 | Driving circuit and liquid crystal display (LCD) television |
| CN102740572A (en) * | 2012-07-18 | 2012-10-17 | 广州凯盛电子科技有限公司 | Driving power supply control circuit |
| CN202818699U (en) * | 2012-08-16 | 2013-03-20 | 重庆雷本光电科技有限公司 | LED automotive headlamp drive circuit |
| CN203279303U (en) * | 2013-05-29 | 2013-11-06 | 广州凯盛电子科技有限公司 | A large-power LED driver and a boost converter protection circuit thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108151775A (en) * | 2016-12-05 | 2018-06-12 | 株式会社三丰 | The light source of encoder and encoder |
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| CN103311879B (en) | 2016-08-17 |
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