CN105282941B - A kind of light adjusting circuit of anti-ac high-voltage input - Google Patents
A kind of light adjusting circuit of anti-ac high-voltage input Download PDFInfo
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- CN105282941B CN105282941B CN201510801354.0A CN201510801354A CN105282941B CN 105282941 B CN105282941 B CN 105282941B CN 201510801354 A CN201510801354 A CN 201510801354A CN 105282941 B CN105282941 B CN 105282941B
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Abstract
The present invention relates to a kind of light adjusting circuits of anti-ac high-voltage input, including the dimming controlling module being connect with feedback system and the anti-AC/ high input voltage circuit being connect with light modulation input terminal DIM+, DIM-, the dimming controlling module and anti-AC/ high input voltage circuit connection.Dimming input circuit provided by the invention is additionally arranged anti-AC/ high input voltage circuit, avoids when there is the case where pouring into high-voltage electricity to the input terminal of light adjusting system, is unlikely to damage circuit.
Description
Technical field
The present invention relates to field of LED illumination, more particularly, to a kind of light adjusting circuit of anti-ac high-voltage input.
Background technique
The application of LED illumination product is quite extensive at present, including outdoor lighting, indoor illumination etc. at home are applied to
LED illumination product.Under normal circumstances, LED illumination product is all directly to use maximum brightness at runtime.Now in order to reach
The purpose of energy-saving and emission-reduction, many illuminating products also increase the function being adjusted to output brightness, to meet different occasions
It uses.But the input terminal of general light adjusting system requires that low pressure accesses, and when there is the case where construction wiring is mistaken, is in light modulation
The input terminal of system pours into high-voltage electricity, then often light adjusting system is damaged.
Summary of the invention
The present invention is to solve the defect of the above prior art, provides a kind of light adjusting circuit of anti-ac high-voltage input, should
Circuit is additionally arranged anti-AC/ high input voltage circuit, avoids when there is the case where pouring into high-voltage electricity to the input terminal of light adjusting system, no
As for damage circuit.
To realize the above goal of the invention, the technical solution adopted is that:
A kind of light adjusting circuit of anti-ac high-voltage input, including the dimming controlling module that is connect with feedback system and with light modulation
The anti-AC/ high input voltage circuit of input terminal DIM+, DIM- connection, the dimming controlling module and anti-AC/ high input voltage circuit connect
It connects.
Preferably, the anti-AC/ high input voltage circuit includes diode D503, diode D502 and resistance R523, light modulation
Input terminal DIM+ is connect by resistance R523, diode D502 with dimming controlling module；The cathode and diode of diode D503
D502 is connected with resistance R523, and the anode of diode D503 is connect with light modulation input terminal DIM-, dimming controlling module.
In above scheme, diode D502 can stop light modulation input to apply positive voltage to the end DIM+, prevent the end DIM+ voltage
Excessively high damage inner body；Diode D503 plays the role of bypass, prevents from being poured into negative voltage by the end DIM+/DIM- and enters light modulation control
Molding block, negative voltage can be all added on resistance R523 by diode D503.According to the size of negative voltage, resistance is calculated
Resistance value needed for R523 and power.It such as to prevent from can use the resistance of 51K/2W, damage in light modulation input terminal input 230VAC, R523
Consumption is 230*230/51K/2=0.52W.
Preferably, the dimming controlling module include constant-current source circuit, voltage regulator circuit, voltage stable circuit, filter circuit,
Subtraction circuit and breaking circuit, the subtraction circuit, breaking circuit include there are two input terminal and an output end, wherein permanent
Current source circuit is connect with the end REF, and constant-current source circuit is connect by voltage regulator circuit with the anode of diode D502, diode D502's
For anode by connecting respectively with an input terminal of an input terminal of subtraction circuit, breaking circuit after filter circuit, voltage is steady
The input terminal for determining circuit is connect with power supply VCC, the input terminal of voltage stable circuit respectively with another input terminal of subtraction circuit,
Another input terminal of breaking circuit connects；The output end of subtraction circuit is connect with feedback system, breaking circuit and turning off system
Connection.
The working principle of dimming controlling module is as follows:
It can access a variety of dimming input signals such as resistance, voltage or pwm signal, constant current in light modulation input terminal DIM+, DIM-
Source circuit generates stable current source Is, and the resistance of light modulation input terminal is flowed into after anti-AC/ high input voltage circuit, is thus generated
One voltage, the voltage carry out the input terminal of subtraction circuit after voltage regulator circuit, filter circuit, and it is steady that subtraction circuit subtracts voltage
Result is exported to feedback system after determining burning voltage caused by circuit, has reached the purpose of light modulation electric current needed for adjustment；It closes
Deenergizing reaches shutdown by comparing the voltage that the voltage and voltage stable circuit that flow into light modulation input terminal DIM+, DIM- generate
Export the purpose of (LED illumination is extinguished completely).
Preferably, the constant-current source circuit includes resistance R501, resistance R502, resistance R503, resistance R504, resistance
R505, capacitor C502 and voltage comparator U500B；
Wherein resistance R504, resistance R505 one end respectively with the inverting input terminal of voltage comparator U500B, positive input
End connection, resistance R504, resistance R505 both ends of the other end respectively with capacitor C502 be attached, resistance R505, capacitor
C502 is connect with the end REF；
The output end of voltage comparator U500B is connect by resistance R502 with voltage regulator circuit, and voltage comparator U500B is just
Phase input terminal connect by resistance R501 with voltage regulator circuit, the inverting input terminal of voltage comparator U500B pass through resistance R503 and
The output end of voltage comparator U500B connects, resistance R504, capacitor C502 ground connection.
Preferably, the voltage regulator circuit includes diode D501, zener diode ZD500, the anode of diode D501 with
Resistance R501 connection, the cathode of diode D501 are connect with the cathode of zener diode ZD500, and zener diode ZD500 is just
The anode of pole ground connection, diode D501 is connect with diode D502, filter circuit.
Preferably, the voltage stable circuit includes avalanche diode SHR500, resistance R507, resistance R506, snowslide two
Pole pipe SHR500 includes three ports, and respectively C-terminal, the end A and the end R, the C-terminal of avalanche diode SHR500 is connect with power supply VCC,
The end A of avalanche diode SHR500 is grounded；The both ends of resistance R506 connect with the end R of power supply VCC, avalanche diode SHR500 respectively
It connects, the end R of avalanche diode SHR500 is grounded by resistance R507；The C-terminal of avalanche diode SHR500 and subtraction circuit it is another
Another input terminal connection of one input terminal, breaking circuit.
Preferably, the filter circuit includes resistance R521, capacitor C506, wherein one end of resistance R521, capacitor C506
It is connect with the anode of the input terminal of subtraction circuit, diode D501, the other end ground connection of resistance R521, capacitor C506.
Preferably, the subtraction circuit includes voltage comparator U500A and resistance R524, and voltage comparator U500A is just
It is connect to input terminal with the anode of diode D501, the inverting input terminal and avalanche diode SHR500 of voltage comparator U500A
C-terminal connection, the inverting input terminal of voltage comparator U500A connected by the output end of resistance R524 and voltage comparator U500A
It connects, the reversed feedback system of the output end of voltage comparator U500A.
Preferably, the breaking circuit includes the first shutdown module and the second shutdown module；
The first shutdown module includes resistance R511, resistance R512, resistance R513, capacitor C505, voltage comparator
U500C and resistance R515, wherein resistance R511, resistance R512 one end respectively with the normal phase input end of voltage comparator U500A,
The C-terminal of avalanche diode SHR500 connects, resistance R511, resistance R512 the other end respectively with voltage comparator U500C just
Phase input terminal, inverting input terminal connection, the inverting input terminal of voltage comparator U500C pass through resistance R513, capacitor C505 and electricity
The output end connection of comparator U500C is pressed, the output end of voltage comparator U500C is connect by resistance R515 with turning off system；
The second shutdown module includes resistance R508, resistance R509, resistance R510, capacitor C504 and voltage comparator
U500D, wherein resistance R508, resistance R509 one end respectively with the positive input of voltage comparator U500A, avalanche diode
The C-terminal of SHR500 connects, resistance R508, resistance R509 the other end respectively with the positive input of voltage comparator U500D, electricity
The reverse input end connection of comparator U500D is pressed, the reverse input end of voltage comparator U500D passes through resistance R510, capacitor
C504 is connect with the output end of voltage comparator U500D, and the output end of voltage comparator U500D is connect with shutdown module.
Compared with prior art, the beneficial effects of the present invention are:
Dimming input circuit provided by the invention is additionally arranged anti-AC/ high input voltage circuit, avoids occurring to light adjusting system
Input terminal the case where pouring into high-voltage electricity when, be unlikely to damage circuit.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for dimming input system.
Fig. 2 is the structural schematic diagram of the light modulation input system of embodiment 1.
Specific embodiment
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；
Below in conjunction with drawings and examples, the present invention is further elaborated.
The anti-AC/ high input voltage circuit of 1- constant-current source circuit, 2- voltage regulator circuit, 3-, 4- voltage stable circuit, 5- filtered electrical
Road, 6- subtraction circuit, 7- breaking circuit.
Embodiment 1
As shown in Figure 1, the light adjusting circuit of anti-ac high-voltage input, including the dimming controlling module that is connect with feedback system and
The anti-AC/ high input voltage circuit being connect with light modulation input terminal DIM+, DIM-, the dimming controlling module and anti-AC/ high input voltage
Circuit connection.
As shown in Figure 1, the anti-AC/ high input voltage circuit includes diode D503, diode D502 and resistance R523, adjust
Light input end DIM+ is connect by resistance R523, diode D502 with dimming controlling module；The cathode of diode D503 and two poles
Pipe D502 is connected with resistance R523, and the anode of diode D503 is connect with light modulation input terminal DIM-, dimming controlling module.
In above scheme, diode D502 can stop light modulation input to apply positive voltage to the end DIM+, prevent the end DIM+ voltage
Excessively high damage inner body；Diode D503 plays the role of bypass, prevents from being poured into negative voltage by the end DIM+/DIM- and enters light modulation control
Molding block, negative voltage can be all added on resistance R523 by diode D503.According to the size of negative voltage, resistance is calculated
Resistance value needed for R523 and power.It such as to prevent from can use the resistance of 51K/2W, damage in light modulation input terminal input 230VAC, R523
Consumption is 230*230/51K/2=0.52W.
As shown in Fig. 2, dimming controlling module include constant-current source circuit, voltage regulator circuit, voltage stable circuit, filter circuit,
Subtraction circuit and breaking circuit, the subtraction circuit, breaking circuit include there are two input terminal and an output end, wherein permanent
Current source circuit is connect with the end REF, and constant-current source circuit is connect by voltage regulator circuit with the anode of diode D502, diode D502's
For anode by connecting respectively with an input terminal of an input terminal of subtraction circuit, breaking circuit after filter circuit, voltage is steady
The input terminal for determining circuit is connect with power supply VCC, the input terminal of voltage stable circuit respectively with another input terminal of subtraction circuit,
Another input terminal of breaking circuit connects；The output end of subtraction circuit is connect with feedback system, breaking circuit and turning off system
Connection.
In above scheme, when voltage regulator circuit is for preventing light modulation input terminal open circuit, overtension causes full load LED electric
Stream is inaccurate；Voltage stable circuit is for generating a burning voltage U, this voltage value U=constant-current source circuit electric current Is*R523；And
Its output voltage is equal to the voltage of light modulation input terminal after subtraction circuit.
The working principle of dimming controlling module is as follows:
It can access a variety of dimming input signals such as resistance, voltage or pwm signal, constant current in light modulation input terminal DIM+, DIM-
Source circuit generates stable current source Is, and the resistance of light modulation input terminal is flowed into after anti-AC/ high input voltage circuit, is thus generated
One voltage, the voltage carry out the input terminal of subtraction circuit after voltage regulator circuit, filter circuit, and it is steady that subtraction circuit subtracts voltage
Result is exported to feedback system after determining burning voltage caused by circuit, to achieve the purpose that dim electric current needed for adjustment；It closes
Deenergizing reaches shutdown by comparing the voltage that the voltage and voltage stable circuit that flow into light modulation input terminal DIM+, DIM- generate
Export the purpose of (LED illumination is extinguished completely).
In the present embodiment, as shown in Fig. 2, constant-current source circuit includes resistance R501, resistance R502, resistance R503, resistance
R504, resistance R505, capacitor C502 and voltage comparator U500B；
Wherein resistance R504, resistance R505 one end respectively with the inverting input terminal of voltage comparator U500B, positive input
End connection, resistance R504, resistance R505 both ends of the other end respectively with capacitor C502 be attached, resistance R505, capacitor
C502 is connect with the end REF；
The output end of voltage comparator U500B is connect by resistance R502 with voltage regulator circuit, and voltage comparator U500B is just
Phase input terminal connect by resistance R501 with voltage regulator circuit, the inverting input terminal of voltage comparator U500B pass through resistance R503 and
The output end of voltage comparator U500B connects, resistance R504, capacitor C502 ground connection.
In the present embodiment, as shown in Fig. 2, voltage regulator circuit includes diode D501, zener diode ZD500, diode
The anode of D501 is connect with resistance R501, and the cathode of diode D501 is connect with the cathode of zener diode ZD500, two pole of pressure stabilizing
The anode of the plus earth of pipe ZD500, diode D501 is connect with diode D502, filter circuit.
In the present embodiment, as shown in Fig. 2, voltage stable circuit includes avalanche diode SHR500, resistance R507, resistance
R506, avalanche diode SHR500 include three ports, respectively C-terminal, the end A and the end R, the C-terminal of avalanche diode SHR500 with
Power supply VCC connection, the end the A ground connection of avalanche diode SHR500；The both ends of resistance R506 respectively with power supply VCC, avalanche diode
The end R of SHR500 connects, and the end R of avalanche diode SHR500 is grounded by resistance R507；The C-terminal of avalanche diode SHR500 with
Another input terminal connection of another input terminal, breaking circuit of subtraction circuit.
In the present embodiment, as shown in Fig. 2, filter circuit includes resistance R521, capacitor C506, wherein resistance R521, capacitor
The anode connection of the input terminal, diode D501 of one end and subtraction circuit of C506, another termination of resistance R521, capacitor C506
Ground.
In the present embodiment, as shown in Fig. 2, subtraction circuit includes voltage comparator U500A and resistance R524, voltage comparator
The positive input of U500A is connect with the anode of diode D501, the inverting input terminal of voltage comparator U500A and two pole of snowslide
The C-terminal of pipe SHR500 connects, and the inverting input terminal of voltage comparator U500A passes through resistance R524's and voltage comparator U500A
Output end connection, the reversed feedback system of the output end of voltage comparator U500A.
In the present embodiment, as shown in Fig. 2, breaking circuit includes the first shutdown module and the second shutdown module；
The first shutdown module includes resistance R511, resistance R512, resistance R513, capacitor C505, voltage comparator
U500C and resistance R515, wherein resistance R511, resistance R512 one end respectively with the normal phase input end of voltage comparator U500A,
The C-terminal of avalanche diode SHR500 connects, resistance R511, resistance R512 the other end respectively with voltage comparator U500C just
Phase input terminal, inverting input terminal connection, the inverting input terminal of voltage comparator U500C pass through resistance R513, capacitor C505 and electricity
The output end connection of comparator U500C is pressed, the output end of voltage comparator U500C is connect by resistance R515 with turning off system；
The second shutdown module includes resistance R508, resistance R509, resistance R510, capacitor C504 and voltage comparator
U500D, wherein resistance R508, resistance R509 one end respectively with the positive input of voltage comparator U500A, avalanche diode
The C-terminal of SHR500 connects, resistance R508, resistance R509 the other end respectively with the positive input of voltage comparator U500D, electricity
The reverse input end connection of comparator U500D is pressed, the reverse input end of voltage comparator U500D passes through resistance R510, capacitor
C504 is connect with the output end of voltage comparator U500D, and the output end of voltage comparator U500D is connect with shutdown module.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention
Protection scope within.
Claims (7)
1. a kind of light adjusting circuit of anti-ac high-voltage input, it is characterised in that: including the brightness adjustment control mould being connect with feedback system
Block and the anti-AC/ high input voltage circuit being connect with light modulation input terminal DIM+, DIM-, the dimming controlling module and anti-AC/ high pressure
Input circuit connection；
The anti-AC/ high input voltage circuit includes diode D503, diode D502 and resistance R523, and light modulation input terminal DIM+ is logical
Cross resistance R523, diode D502 is connect with dimming controlling module；The cathode and diode D502 and resistance of diode D503
The anode of R523 connection, diode D503 is connect with light modulation input terminal DIM-, dimming controlling module；
The dimming controlling module include constant-current source circuit, voltage regulator circuit, voltage stable circuit, filter circuit, subtraction circuit and
Breaking circuit, the subtraction circuit, breaking circuit include there are two input terminal and an output end, wherein constant-current source circuit with
The connection of the end REF, constant-current source circuit are connect by voltage regulator circuit with the anode of diode D502, and the anode of diode D502 passes through filter
Connect respectively with an input terminal of an input terminal of subtraction circuit, breaking circuit after wave circuit, voltage stable circuit it is defeated
Enter end to connect with power supply VCC, the input terminal of voltage stable circuit respectively with another input terminal of subtraction circuit, breaking circuit
The connection of another input terminal；The output end of subtraction circuit is connect with feedback system, and breaking circuit is connect with turning off system.
2. the light adjusting circuit of anti-ac high-voltage input according to claim 1, it is characterised in that: the constant-current source circuit packet
Include resistance R501, resistance R502, resistance R503, resistance R504, resistance R505, capacitor C502 and voltage comparator U500B；
Wherein resistance R504, resistance R505 one end respectively with the inverting input terminal of voltage comparator U500B, normal phase input end connect
Connect, resistance R504, resistance R505 both ends of the other end respectively with capacitor C502 be attached, resistance R505, capacitor C502 with
The connection of the end REF；
The output end of voltage comparator U500B is connect by resistance R502 with voltage regulator circuit, and the positive of voltage comparator U500B is defeated
Enter end to connect by resistance R501 with voltage regulator circuit, the inverting input terminal of voltage comparator U500B passes through resistance R503 and voltage
The output end of comparator U500B connects, resistance R504, capacitor C502 ground connection.
3. the light adjusting circuit of anti-ac high-voltage input according to claim 2, it is characterised in that: the voltage regulator circuit includes
Diode D501, zener diode ZD500, diode D501 anode connect with resistance R501, the cathode of diode D501 and
The cathode of zener diode ZD500 connects, the plus earth of zener diode ZD500, the anode and diode of diode D501
D502, filter circuit connection.
4. the light adjusting circuit of anti-ac high-voltage input according to claim 3, it is characterised in that: the voltage stable circuit
It include three ports, respectively C including avalanche diode SHR500, resistance R507, resistance R506, avalanche diode SHR500
End, the end A and the end R, the C-terminal of avalanche diode SHR500 are connect with power supply VCC, the end the A ground connection of avalanche diode SHR500；Resistance
The both ends of R506 are connect with the end R of power supply VCC, avalanche diode SHR500 respectively, and the end R of avalanche diode SHR500 passes through electricity
Hinder R507 ground connection；Another input of another input terminal, breaking circuit of the C-terminal and subtraction circuit of avalanche diode SHR500
End connection.
5. the light adjusting circuit of anti-ac high-voltage input according to claim 4, it is characterised in that: the filter circuit includes
Resistance R521, capacitor C506, wherein resistance R521, the input terminal of one end of capacitor C506 and subtraction circuit, diode D501
Anode connection, the other end ground connection of resistance R521, capacitor C506.
6. the light adjusting circuit of anti-ac high-voltage input according to claim 5, it is characterised in that: the subtraction circuit includes
The positive input of voltage comparator U500A and resistance R524, voltage comparator U500A are connect with the anode of diode D501,
The inverting input terminal of voltage comparator U500A is connect with the C-terminal of avalanche diode SHR500, the reverse phase of voltage comparator U500A
Input terminal is connect by resistance R524 with the output end of voltage comparator U500A, the reversed feedback of the output end of voltage comparator U500A
System.
7. the light adjusting circuit of anti-ac high-voltage input according to claim 6, it is characterised in that: the breaking circuit includes
First shutdown module and the second shutdown module；
It is described first shutdown module include resistance R511, resistance R512, resistance R513, capacitor C505, voltage comparator U500C and
Resistance R515, wherein resistance R511, resistance R512 one end respectively with the normal phase input end of voltage comparator U500A, snowslide two
The C-terminal of pole pipe SHR500 connects, resistance R511, resistance R512 the other end inputted respectively with the positive of voltage comparator U500C
End, inverting input terminal connection, the inverting input terminal of voltage comparator U500C is by resistance R513, capacitor C505 compared with voltage
The output end of device U500C connects, and the output end of voltage comparator U500C is connect by resistance R515 with turning off system；
The second shutdown module includes resistance R508, resistance R509, resistance R510, capacitor C504 and voltage comparator U500D,
Wherein resistance R508, resistance R509 one end respectively with the positive input of voltage comparator U500A, avalanche diode SHR500
C-terminal connection, resistance R508, resistance R509 the other end respectively compared with the positive input of voltage comparator U500D, voltage
The reverse input end of device U500D connects, and the reverse input end of voltage comparator U500D passes through resistance R510, capacitor C504 and electricity
The output end connection of comparator U500D is pressed, the output end of voltage comparator U500D is connect with shutdown module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510801354.0A CN105282941B (en) | 2015-11-18 | 2015-11-18 | A kind of light adjusting circuit of anti-ac high-voltage input |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Publication Number | Publication Date |
|---|---|
| CN105282941A CN105282941A (en) | 2016-01-27 |
| CN105282941B true CN105282941B (en) | 2019-03-22 |
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| CN201510801354.0A Active CN105282941B (en) | 2015-11-18 | 2015-11-18 | A kind of light adjusting circuit of anti-ac high-voltage input |
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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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| CN105282941A (en) | 2016-01-27 |
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