CN105282941A - A dimming circuit preventing alternating current high voltage input - Google Patents
A dimming circuit preventing alternating current high voltage input Download PDFInfo
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- CN105282941A CN105282941A CN201510801354.0A CN201510801354A CN105282941A CN 105282941 A CN105282941 A CN 105282941A CN 201510801354 A CN201510801354 A CN 201510801354A CN 105282941 A CN105282941 A CN 105282941A
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Abstract
The invention relates to a dimming circuit preventing alternating current high voltage input. The dimming circuit comprises a dimming control module connected with a feedback system and an AC/high voltage input preventing circuit connected with dimming input ends DIM+ and DIM-. The dimming control module is connected with the AC/high voltage input preventing circuit. With the added AC/high voltage input preventing circuit, the circuit is prevented from being damaged when high voltage electricity is poured in an input end of a dimming system.
Description
Technical field
The present invention relates to field of LED illumination, more specifically, relate to a kind of light adjusting circuit of anti-ac high-voltage input.
Background technology
The application of current LED illumination product is quite extensive, comprises outdoor lighting, indoor illumination at home etc. and is applied to LED illumination product.Generally, LED illumination product is all operationally directly use maximum brightness.Now in order to reach the object of energy-saving and emission-reduction, many illuminating products too increase the function adjusted output brightness, with the use of satisfied different occasion.But the input of general light adjusting system all requires that low pressure accesses, when there is the situation that construction distribution is mistaken, pouring into high-tension electricity at the input of light adjusting system, then often light adjusting system being damaged.
Summary of the invention
The present invention is the defect solving above prior art, and provide a kind of light adjusting circuit of anti-ac high-voltage input, this circuit has set up anti-AC/ high input voltage circuit, avoids, when occurring pouring into the situation of high-tension electricity to the input of light adjusting system, being unlikely to damage circuit.
For realizing above goal of the invention, the technical scheme of employing is:
A light adjusting circuit for anti-ac high-voltage input, comprise the dimming controlling module be connected with reponse system and the anti-AC/ high input voltage circuit be connected with light modulation input DIM+, DIM-, described dimming controlling module is connected with anti-AC/ high input voltage circuit.
Preferably, described anti-AC/ high input voltage circuit comprises diode D503, diode D502 and resistance R523, and light modulation input DIM+ is connected with dimming controlling module by resistance R523, diode D502; The negative pole of diode D503 is connected with diode D502 and resistance R523, and the positive pole of diode D503 is connected with light modulation input DIM-, dimming controlling module.
In such scheme, diode D502 can stop that light modulation input applies positive voltage to DIM+ end, prevents the too high damage inner body of DIM+ terminal voltage; Diode D503 plays bypass effect, and prevent pouring into negative voltage by DIM+/DIM-end and enter dimming controlling module, negative voltage is all added on resistance R523 by diode D503.According to the size of negative voltage, calculate the resistance needed for resistance R523 and power.As prevented the resistance at the desirable 51K/2W of light modulation input input 230VAC, R523, its loss is 230*230/51K/2=0.52W.
Preferably, described dimming controlling module comprises constant-current source circuit, voltage stabilizing circuit, voltage stable circuit, filter circuit, subtraction circuit and breaking circuit, described subtraction circuit, breaking circuit all includes two inputs and an output, wherein constant-current source circuit is held with REF and is connected, constant-current source circuit is connected by the positive pole of voltage stabilizing circuit with diode D502, the positive pole of diode D502 by after filter circuit respectively with an input of subtraction circuit, an input of breaking circuit connects, the input of voltage stable circuit is connected with power supply VCC, the output of voltage stable circuit respectively with another input of subtraction circuit, another input of breaking circuit connects, the output of subtraction circuit is connected with reponse system, and breaking circuit is connected with turning off system.
The operation principle of dimming controlling module is as follows:
Can be accessed by the multiple dimming input signal such as resistance, voltage or pwm signal at light modulation input DIM+, DIM-, constant-current source circuit produces stable current source Is, the resistance of light modulation input is flowed into after anti-AC/ high input voltage circuit, produce a voltage thus, this voltage carries out the input of subtraction circuit after voltage stabilizing circuit, filter circuit, subtraction circuit exports result to reponse system after deducting the burning voltage that voltage stable circuit produces, and has reached the object of the required light modulation electric current of adjustment; The voltage that breaking circuit is produced by the voltage and voltage stable circuit comparing inflow light modulation input DIM+, DIM-reaches the object turning off and export (LED illumination is extinguished completely).
Preferably, described constant-current source circuit comprises resistance R501, resistance R502, resistance R503, resistance R504, resistance R505, electric capacity C502 and voltage comparator U500B;
Wherein one end of resistance R504, resistance R505 is connected with the inverting input of voltage comparator U500B, normal phase input end respectively, the other end of resistance R504, resistance R505 is connected with the two ends of electric capacity C502 respectively, and resistance R505, electric capacity C502 and REF hold connection;
The output of voltage comparator U500B is connected with voltage stabilizing circuit by resistance R502, the normal phase input end of voltage comparator U500B is connected with voltage stabilizing circuit by resistance R501, the inverting input of voltage comparator U500B is connected with the output of voltage comparator U500B by resistance R503, resistance R504, electric capacity C502 ground connection.
Preferably, described voltage stabilizing circuit comprises diode D501, voltage stabilizing didoe ZD500, the positive pole of diode D501 is connected with resistance R501, the negative pole of diode D501 is connected with the negative pole of voltage stabilizing didoe ZD500, the plus earth of voltage stabilizing didoe ZD500, the positive pole of diode D501 is connected with diode D502, filter circuit.
Preferably, described voltage stable circuit comprises avalanche diode SHR500, resistance R507, resistance R506, and avalanche diode SHR500 comprises three ports, is respectively C end, A end and R end, the C end of avalanche diode SHR500 is connected with power supply VCC, and the A of avalanche diode SHR500 holds ground connection; The two ends of resistance R506 are held with the R of power supply VCC, avalanche diode SHR500 respectively and are connected, and the R end of avalanche diode SHR500 is by resistance R507 ground connection; The C end of avalanche diode SHR500 is connected with another input of subtraction circuit, another input of breaking circuit.
Preferably, described filter circuit comprises resistance R521, electric capacity C506, and wherein one end of resistance R521, electric capacity C506 is connected with the input of subtraction circuit, the positive pole of diode D501, the other end ground connection of resistance R521, electric capacity C506.
Preferably, described subtraction circuit comprises voltage comparator U500A and resistance R524, the positive input of voltage comparator U500A is connected with the positive pole of diode D501, the inverting input of voltage comparator U500A is held with the C of avalanche diode SHR500 and is connected, the inverting input of voltage comparator U500A is connected with the output of voltage comparator U500A by resistance R524, the output termination reponse system of voltage comparator U500A.
Preferably, described breaking circuit comprises the first shutoff module and the second shutoff module;
Described first turns off module comprises resistance R511, resistance R512, resistance R513, electric capacity C505, voltage comparator U500C and resistance R515, wherein resistance R511, one end of resistance R512 respectively with the normal phase input end of voltage comparator U500A, the C end of avalanche diode SHR500 connects, resistance R511, the other end of resistance R512 respectively with the normal phase input end of voltage comparator U500C, inverting input connects, the inverting input of voltage comparator U500C is by resistance R513, electric capacity C505 is connected with the output of voltage comparator U500C, the output of voltage comparator U500C is connected with turning off system by resistance R515,
Described second turns off module comprises resistance R508, resistance R509, resistance R510, electric capacity C504 and voltage comparator U500D, wherein resistance R508, one end of resistance R509 respectively with the positive input of voltage comparator U500A, the C end of avalanche diode SHR500 connects, resistance R508, the other end of resistance R509 respectively with the positive input of voltage comparator U500D, the reverse input end of voltage comparator U500D connects, the reverse input end of voltage comparator U500D is by resistance R510, electric capacity C504 is connected with the output of voltage comparator U500D, output and the shutoff model calling of voltage comparator U500D.
Compared with prior art, the invention has the beneficial effects as follows:
Dimming input circuit provided by the invention has set up anti-AC/ high input voltage circuit, avoids, when occurring pouring into the situation of high-tension electricity to the input of light adjusting system, being unlikely to damage circuit.
Accompanying drawing explanation
Fig. 1 is the structural representation of light modulation input system.
Fig. 2 is the structural representation of the light modulation input system of embodiment 1.
Embodiment
Accompanying drawing, only for exemplary illustration, can not be interpreted as the restriction to this patent;
Below in conjunction with drawings and Examples, the present invention is further elaborated.
1-constant-current source circuit, 2-voltage stabilizing circuit, 3-anti-AC/ high input voltage circuit, 4-voltage stable circuit, 5-filter circuit, 6-subtraction circuit, 7-breaking circuit.
Embodiment 1
As shown in Figure 1, the light adjusting circuit of anti-ac high-voltage input, comprise the dimming controlling module be connected with reponse system and the anti-AC/ high input voltage circuit be connected with light modulation input DIM+, DIM-, described dimming controlling module is connected with anti-AC/ high input voltage circuit.
As shown in Figure 1, described anti-AC/ high input voltage circuit comprises diode D503, diode D502 and resistance R523, and light modulation input DIM+ is connected with dimming controlling module by resistance R523, diode D502; The negative pole of diode D503 is connected with diode D502 and resistance R523, and the positive pole of diode D503 is connected with light modulation input DIM-, dimming controlling module.
In such scheme, diode D502 can stop that light modulation input applies positive voltage to DIM+ end, prevents the too high damage inner body of DIM+ terminal voltage; Diode D503 plays bypass effect, and prevent pouring into negative voltage by DIM+/DIM-end and enter dimming controlling module, negative voltage is all added on resistance R523 by diode D503.According to the size of negative voltage, calculate the resistance needed for resistance R523 and power.As prevented the resistance at the desirable 51K/2W of light modulation input input 230VAC, R523, its loss is 230*230/51K/2=0.52W.
As shown in Figure 2, dimming controlling module comprises constant-current source circuit, voltage stabilizing circuit, voltage stable circuit, filter circuit, subtraction circuit and breaking circuit, described subtraction circuit, breaking circuit all includes two inputs and an output, wherein constant-current source circuit is held with REF and is connected, constant-current source circuit is connected by the positive pole of voltage stabilizing circuit with diode D502, the positive pole of diode D502 by after filter circuit respectively with an input of subtraction circuit, an input of breaking circuit connects, the input of voltage stable circuit is connected with power supply VCC, the output of voltage stable circuit respectively with another input of subtraction circuit, another input of breaking circuit connects, the output of subtraction circuit is connected with reponse system, and breaking circuit is connected with turning off system.
In such scheme, when voltage stabilizing circuit is used for preventing light modulation input from opening a way, overtension, causes full load LED current to be forbidden; Voltage stable circuit for generation of a burning voltage U, the electric current I s*R523 of this magnitude of voltage U=constant-current source circuit; And its output voltage equals the voltage of light modulation input after subtraction circuit.
The operation principle of dimming controlling module is as follows:
Can be accessed by the multiple dimming input signal such as resistance, voltage or pwm signal at light modulation input DIM+, DIM-, constant-current source circuit produces stable current source Is, the resistance of light modulation input is flowed into after anti-AC/ high input voltage circuit, produce a voltage thus, this voltage carries out the input of subtraction circuit after voltage stabilizing circuit, filter circuit, subtraction circuit exports result to reponse system after deducting the burning voltage that voltage stable circuit produces, to reach the object of the required light modulation electric current of adjustment; The voltage that breaking circuit is produced by the voltage and voltage stable circuit comparing inflow light modulation input DIM+, DIM-reaches the object turning off and export (LED illumination is extinguished completely).
In the present embodiment, as shown in Figure 2, constant-current source circuit comprises resistance R501, resistance R502, resistance R503, resistance R504, resistance R505, electric capacity C502 and voltage comparator U500B;
Wherein one end of resistance R504, resistance R505 is connected with the inverting input of voltage comparator U500B, normal phase input end respectively, the other end of resistance R504, resistance R505 is connected with the two ends of electric capacity C502 respectively, and resistance R505, electric capacity C502 and REF hold connection;
The output of voltage comparator U500B is connected with voltage stabilizing circuit by resistance R502, the normal phase input end of voltage comparator U500B is connected with voltage stabilizing circuit by resistance R501, the inverting input of voltage comparator U500B is connected with the output of voltage comparator U500B by resistance R503, resistance R504, electric capacity C502 ground connection.
In the present embodiment, as shown in Figure 2, voltage stabilizing circuit comprises diode D501, voltage stabilizing didoe ZD500, the positive pole of diode D501 is connected with resistance R501, the negative pole of diode D501 is connected with the negative pole of voltage stabilizing didoe ZD500, the plus earth of voltage stabilizing didoe ZD500, the positive pole of diode D501 is connected with diode D502, filter circuit.
In the present embodiment, as shown in Figure 2, voltage stable circuit comprises avalanche diode SHR500, resistance R507, resistance R506, avalanche diode SHR500 comprises three ports, be respectively C end, A end and R end, the C end of avalanche diode SHR500 is connected with power supply VCC, and the A of avalanche diode SHR500 holds ground connection; The two ends of resistance R506 are held with the R of power supply VCC, avalanche diode SHR500 respectively and are connected, and the R end of avalanche diode SHR500 is by resistance R507 ground connection; The C end of avalanche diode SHR500 is connected with another input of subtraction circuit, another input of breaking circuit.
In the present embodiment, as shown in Figure 2, filter circuit comprises resistance R521, electric capacity C506, and wherein one end of resistance R521, electric capacity C506 is connected with the input of subtraction circuit, the positive pole of diode D501, the other end ground connection of resistance R521, electric capacity C506.
In the present embodiment, as shown in Figure 2, subtraction circuit comprises voltage comparator U500A and resistance R524, the positive input of voltage comparator U500A is connected with the positive pole of diode D501, the inverting input of voltage comparator U500A is held with the C of avalanche diode SHR500 and is connected, the inverting input of voltage comparator U500A is connected with the output of voltage comparator U500A by resistance R524, the output termination reponse system of voltage comparator U500A.
In the present embodiment, as shown in Figure 2, breaking circuit comprises the first shutoff module and the second shutoff module;
Described first turns off module comprises resistance R511, resistance R512, resistance R513, electric capacity C505, voltage comparator U500C and resistance R515, wherein resistance R511, one end of resistance R512 respectively with the normal phase input end of voltage comparator U500A, the C end of avalanche diode SHR500 connects, resistance R511, the other end of resistance R512 respectively with the normal phase input end of voltage comparator U500C, inverting input connects, the inverting input of voltage comparator U500C is by resistance R513, electric capacity C505 is connected with the output of voltage comparator U500C, the output of voltage comparator U500C is connected with turning off system by resistance R515,
Described second turns off module comprises resistance R508, resistance R509, resistance R510, electric capacity C504 and voltage comparator U500D, wherein resistance R508, one end of resistance R509 respectively with the positive input of voltage comparator U500A, the C end of avalanche diode SHR500 connects, resistance R508, the other end of resistance R509 respectively with the positive input of voltage comparator U500D, the reverse input end of voltage comparator U500D connects, the reverse input end of voltage comparator U500D is by resistance R510, electric capacity C504 is connected with the output of voltage comparator U500D, output and the shutoff model calling of voltage comparator U500D.
Obviously, the above embodiment of the present invention is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all execution modes.All any amendments done within the spirit and principles in the present invention, equivalent to replace and improvement etc., within the protection range that all should be included in the claims in the present invention.
Claims (9)
1. the light adjusting circuit of an anti-ac high-voltage input, it is characterized in that: comprise the dimming controlling module be connected with reponse system and the anti-AC/ high input voltage circuit be connected with light modulation input DIM+, DIM-, described dimming controlling module is connected with anti-AC/ high input voltage circuit.
2. the light adjusting circuit of anti-ac high-voltage input according to claim 1, it is characterized in that: described anti-AC/ high input voltage circuit comprises diode D503, diode D502 and resistance R523, light modulation input DIM+ is connected with dimming controlling module by resistance R523, diode D502; The negative pole of diode D503 is connected with diode D502 and resistance R523, and the positive pole of diode D503 is connected with light modulation input DIM-, dimming controlling module.
3. the light adjusting circuit of anti-ac high-voltage input according to claim 2, it is characterized in that: described dimming controlling module comprises constant-current source circuit, voltage stabilizing circuit, voltage stable circuit, filter circuit, subtraction circuit and breaking circuit, described subtraction circuit, breaking circuit all includes two inputs and an output, wherein constant-current source circuit is held with REF and is connected, constant-current source circuit is connected by the positive pole of voltage stabilizing circuit with diode D502, the positive pole of diode D502 by after filter circuit respectively with an input of subtraction circuit, an input of breaking circuit connects, the input of voltage stable circuit is connected with power supply VCC, the output of voltage stable circuit respectively with another input of subtraction circuit, another input of breaking circuit connects, the output of subtraction circuit is connected with reponse system, and breaking circuit is connected with turning off system.
4. the light adjusting circuit of anti-ac high-voltage input according to claim 3, is characterized in that: described constant-current source circuit comprises resistance R501, resistance R502, resistance R503, resistance R504, resistance R505, electric capacity C502 and voltage comparator U500B;
Wherein one end of resistance R504, resistance R505 is connected with the inverting input of voltage comparator U500B, normal phase input end respectively, the other end of resistance R504, resistance R505 is connected with the two ends of electric capacity C502 respectively, and resistance R505, electric capacity C502 and REF hold connection;
The output of voltage comparator U500B is connected with voltage stabilizing circuit by resistance R502, the normal phase input end of voltage comparator U500B is connected with voltage stabilizing circuit by resistance R501, the inverting input of voltage comparator U500B is connected with the output of voltage comparator U500B by resistance R503, resistance R504, electric capacity C502 ground connection.
5. the light adjusting circuit of anti-ac high-voltage input according to claim 4, it is characterized in that: described voltage stabilizing circuit comprises diode D501, voltage stabilizing didoe ZD500, the positive pole of diode D501 is connected with resistance R501, the negative pole of diode D501 is connected with the negative pole of voltage stabilizing didoe ZD500, the plus earth of voltage stabilizing didoe ZD500, the positive pole of diode D501 is connected with diode D502, filter circuit.
6. the light adjusting circuit of anti-ac high-voltage input according to claim 5, it is characterized in that: described voltage stable circuit comprises avalanche diode SHR500, resistance R507, resistance R506, avalanche diode SHR500 comprises three ports, be respectively C end, A end and R end, the C end of avalanche diode SHR500 is connected with power supply VCC, and the A of avalanche diode SHR500 holds ground connection; The two ends of resistance R506 are held with the R of power supply VCC, avalanche diode SHR500 respectively and are connected, and the R end of avalanche diode SHR500 is by resistance R507 ground connection; The C end of avalanche diode SHR500 is connected with another input of subtraction circuit, another input of breaking circuit.
7. the light adjusting circuit of anti-ac high-voltage input according to claim 6, it is characterized in that: described filter circuit comprises resistance R521, electric capacity C506, wherein one end of resistance R521, electric capacity C506 is connected with the input of subtraction circuit, the positive pole of diode D501, the other end ground connection of resistance R521, electric capacity C506.
8. the light adjusting circuit of anti-ac high-voltage input according to claim 7, it is characterized in that: described subtraction circuit comprises voltage comparator U500A and resistance R524, the positive input of voltage comparator U500A is connected with the positive pole of diode D501, the inverting input of voltage comparator U500A is held with the C of avalanche diode SHR500 and is connected, the inverting input of voltage comparator U500A is connected with the output of voltage comparator U500A by resistance R524, the output termination reponse system of voltage comparator U500A.
9. the light adjusting circuit of anti-ac high-voltage input according to claim 8, is characterized in that: described breaking circuit comprises the first shutoff module and second and turns off module;
Described first turns off module comprises resistance R511, resistance R512, resistance R513, electric capacity C505, voltage comparator U500C and resistance R515, wherein resistance R511, one end of resistance R512 respectively with the normal phase input end of voltage comparator U500A, the C end of avalanche diode SHR500 connects, resistance R511, the other end of resistance R512 respectively with the normal phase input end of voltage comparator U500C, inverting input connects, the inverting input of voltage comparator U500C is by resistance R513, electric capacity C505 is connected with the output of voltage comparator U500C, the output of voltage comparator U500C is connected with turning off system by resistance R515,
Described second turns off module comprises resistance R508, resistance R509, resistance R510, electric capacity C504 and voltage comparator U500D, wherein resistance R508, one end of resistance R509 respectively with the positive input of voltage comparator U500A, the C end of avalanche diode SHR500 connects, resistance R508, the other end of resistance R509 respectively with the positive input of voltage comparator U500D, the reverse input end of voltage comparator U500D connects, the reverse input end of voltage comparator U500D is by resistance R510, electric capacity C504 is connected with the output of voltage comparator U500D, output and the shutoff model calling of voltage comparator U500D.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510801354.0A CN105282941B (en) | 2015-11-18 | 2015-11-18 | A kind of light adjusting circuit of anti-ac high-voltage input |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510801354.0A CN105282941B (en) | 2015-11-18 | 2015-11-18 | A kind of light adjusting circuit of anti-ac high-voltage input |
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| CN105282941B CN105282941B (en) | 2019-03-22 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5850127A (en) * | 1996-05-10 | 1998-12-15 | Philips Electronics North America Corporation | EBL having a feedback circuit and a method for ensuring low temperature lamp operation at low dimming levels |
| CN102789763A (en) * | 2011-05-18 | 2012-11-21 | 台达电子工业股份有限公司 | Variable-frequency dimming control device for light-emitting diodes (LEDs) and operating method of variable-frequency dimming control device |
| CN202738205U (en) * | 2012-08-08 | 2013-02-13 | 深圳民爆光电技术有限公司 | LED dimming drive circuit |
-
2015
- 2015-11-18 CN CN201510801354.0A patent/CN105282941B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5850127A (en) * | 1996-05-10 | 1998-12-15 | Philips Electronics North America Corporation | EBL having a feedback circuit and a method for ensuring low temperature lamp operation at low dimming levels |
| CN1199527C (en) * | 1996-05-10 | 2005-04-27 | 皇家菲利浦电子有限公司 | Dimmable ballast |
| CN102789763A (en) * | 2011-05-18 | 2012-11-21 | 台达电子工业股份有限公司 | Variable-frequency dimming control device for light-emitting diodes (LEDs) and operating method of variable-frequency dimming control device |
| CN202738205U (en) * | 2012-08-08 | 2013-02-13 | 深圳民爆光电技术有限公司 | LED dimming drive circuit |
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