CN102480815B - LED (light emitting diode) dimming drive circuit - Google Patents

LED (light emitting diode) dimming drive circuit Download PDF

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Publication number
CN102480815B
CN102480815B CN201010554920.XA CN201010554920A CN102480815B CN 102480815 B CN102480815 B CN 102480815B CN 201010554920 A CN201010554920 A CN 201010554920A CN 102480815 B CN102480815 B CN 102480815B
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pin
resistance
triode
relay
current
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CN102480815A (en
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周明杰
孙占民
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Oceans King Lighting Science and Technology Co Ltd
Shenzhen Oceans King Lighting Engineering Co Ltd
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Oceans King Lighting Science and Technology Co Ltd
Shenzhen Oceans King Lighting Engineering Co Ltd
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Abstract

The invention relates to an LED (light emitting diode) dimming drive circuit, comprising a working power supply, a voltage stabilizing circuit, a constant current circuit, a control circuit and an LED lamp bank. A constant current integration chip is respectively connected with a current sampling resistor R11, a resistor R12 and a resistor R13 and then is connected to the anode of the LED lamp bank through a relay K1, a relay K2 and a relay K3 respectively. The cathode of the LED lamp bank is connected with a GND (Ground). In the invention, the constant current integration chip is adopted to drive to perform dimming and ensure the LED to work stable and reliably.

Description

A kind of LED dimming driving circuit
[technical field]
The present invention relates to a kind of LED drive circuit, particularly relate to a kind of LED dimming driving circuit.
[background technology]
Along with the development of science and technology, New Products & New Technology is constantly reformed, and LED is as new type light source, it has energy-saving and environmental protection, efficiently feature, technology is ripe and be applied to every field, and LED is widely used as lighting source, has also occurred various LED drive circuit thereupon.Along with the development of microelectric technique, much adopt the integrated high-frequency model design LED of integration to drive at present in the place of direct current 24V, it has the advantages such as power consumption is little, efficiency is high, unit power volume is little, lightweight, driving current constant, plan as a whole the advantage of Switching Power Supply, overcome the interference problem of Switching Power Supply, circuit is simple and reliable.But be all that firm power exports, can not regulate power output, intensity of illumination can not regulate, and brings serious inconvenience to user.
Therefore, prior art needs to improve.
[summary of the invention]
In view of this, be necessary to propose a kind of efficient, reliable, cheap, simple, light LED dimming driving circuit, driving LED work that can be safe and reliable.
A technical scheme of the present invention is, a kind of LED dimming driving circuit, and it comprises working power, voltage stabilizing circuit, constant-current circuit, control circuit and LED group; Constant-current circuit comprises three-terminal voltage regulator U2, current sampling resistor R11, current sampling resistor R12, current sampling resistor R13, relay K 1, relay K 2, relay K 3, for providing constant operation electric current for LED group; 1 pin of three-terminal voltage regulator U2 is output pin, be connected respectively to current sampling resistor R11, current sampling resistor R12, current sampling resistor R13, the other end of current sampling resistor R11, current sampling resistor R12, current sampling resistor R13, is connected to LED group anode respectively by relay K 1, relay K 2, relay K 3; 2 pin are sampling feedback pin, are connected with output pin 1 pin by current sampling resistor R11, and are connected with current sampling resistor R12, current sampling resistor R13 respectively by relay K 2, relay K 3; 3 pin are power supply input pin, are directly connected with working power positive pole; Coil windings one end of relay K 1, relay K 2, relay K 3 connects one to one with the negative electrode of diode D2, diode D3, diode D4 respectively, and be connected with working power positive pole respectively, the other end is connected with the anode of diode D2, diode D3, diode D4 respectively; Voltage stabilizing circuit comprises Voltage stabilizing module U1, current-limiting resistance R2, voltage stabilizing didoe D1; 1 pin of Voltage stabilizing module U1 is power supply input pin, is connected, and meets working power GND by voltage stabilizing didoe D1 by current-limiting resistance R2 with working power positive pole; 2 pin are GND pin, are directly connected with working power GND; 3 pin are+5V output pin; Control circuit comprises counting/frequency divider U3, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, current-limiting resistance R8, current-limiting resistance R9, current-limiting resistance R10, electric capacity C4, electric capacity C5, triode Q1, triode Q2, triode Q3, and touch-switch S1, for realizing LED group dimming function; 1,2,3,4,5,6,7,9,10,11 pin of counting/frequency divider U3 are output pin, wherein 1,2,5,6,9,11 pin are unsettled, 3 pin are connected with the base stage of triode Q3 by current-limiting resistance R8,4 pin are connected with the base stage of triode Q2 by current-limiting resistance R9,7 pin are connected with the base stage of triode Q1 by current-limiting resistance R10, the emitter of triode Q1, triode Q2, triode Q3 is all connected with GND, 10 pin are connected with 3 pin of Voltage stabilizing module U1 by resistance R6, and are connected with its 15 pin by resistance R7; 8 pin are GND pin, are directly connected with working power GND; 12 pin are carry output pin, unsettled; 13 pin are time constraints input pin, are connected by resistance R5 with GND; 14 pin are clock input pin, and as dimming control signal input sample pin, high level is effective, is connected with 3 pin of Voltage stabilizing module U1 by resistance R3, touch-switch S1, also by the resistance R4 after parallel connection and electric capacity C4, is connected with GND; 15 pin are reset input pin, are connected by electric capacity C5 with GND; 16 pin are power supply input pin, are directly connected with 3 pin of Voltage stabilizing module U1; The collector electrode of triode Q1, triode Q2, triode Q3 also connects one to one with the anode of diode D2, diode D3, diode D4 respectively; LED group negative electrode is connected with GND.
Be applied to such scheme, described LED dimming driving circuit also comprises storage capacitor C1 and Surge suppression resistance R1, the positive pole of storage capacitor C1 is connected with working power positive pole, and Surge suppression resistance R1 one end is connected with the negative pole of storage capacitor C1, and the other end is connected with working power GND.
Be applied to above-mentioned each scheme, in described LED dimming driving circuit, voltage stabilizing circuit also comprises smooth electric capacity C2 and high frequency capacitance C3, and after both parallel connections, one end is connected with 2 pin of Voltage stabilizing module U1, and the other end is connected with 3 pin of Voltage stabilizing module U1.
Be applied to above-mentioned each scheme, in described LED dimming driving circuit, the emitter of triode Q1, triode Q2, triode Q3, and LED group negative electrode connects altogether.
Be applied to above-mentioned each scheme, in described LED dimming driving circuit, Voltage stabilizing module U1 is LM7805, and three-terminal voltage regulator U2 is LM317, and counting/frequency divider U3 is CD4017.
Be applied to above-mentioned each scheme, in described LED dimming driving circuit, voltage stabilizing didoe D1 is 15V/0.5W, and diode D2, diode D3, diode D4 are SS14; Triode Q1, triode Q2, triode Q3 are C945; Relay K 1, relay K 2, relay K 3 are 24V/1A.
Be applied to above-mentioned each relevant programme, in described LED dimming driving circuit, storage capacitor C1 is 470 μ F/50V, and smooth electric capacity C2 is 22 μ F/16V, electric capacity C3, electric capacity C4, electric capacity C5 are 103 electric capacity.
Be applied to above-mentioned each scheme, in described LED dimming driving circuit, resistance R1, resistance R2, resistance R8, resistance R9, resistance R10 resistance are identical, are 1k Ω; Resistance R3 resistance is 100k Ω; Resistance R4 resistance is 1.5M Ω; Resistance R5, resistance R6 resistance are identical, are 10k Ω; Resistance R7 resistance is 200k Ω; Resistance R11 resistance is 4.3 Ω; Resistance R12 resistance is 39 Ω; Resistance R13 resistance is 30 Ω.
Be applied to above-mentioned each scheme, in described LED dimming driving circuit, described working power is DC supply, and such as, described DC supply is 24V.
Such scheme, LED illumination is realized by adopting adjustable mode, opening of light fixture can be controlled by control button close and carry out brightness regulation, meet the exact demand of people to light intensity larger, it also avoid unnecessary energy resource consumption, economic environmental protection, significantly enhances the result of use of user, has very high market value.
[accompanying drawing explanation]
Fig. 1 is the schematic diagram of an embodiment.
[embodiment]
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
As shown in Figure 1, one embodiment of the present of invention are, a kind of LED dimming driving circuit, and it comprises working power, voltage stabilizing circuit, constant-current circuit, control circuit and LED group.
Wherein, constant-current circuit comprises three-terminal voltage regulator U2, current sampling resistor R11, R12, R13, relay K 1, K2, K3, for providing constant operation electric current for LED group.
1 pin of three-terminal voltage regulator U2 is output pin, and connect one end of current sampling resistor R11, R12, R13 respectively, the other end of current sampling resistor R11, R12, R13, is connected to LED group anode respectively by relay K 1, K2, K3; 2 pin of three-terminal voltage regulator U2 are sampling feedback pin, are connected with output pin 1 pin by current sampling resistor R11, as shown in Figure 1, and are connected with resistance R12, R13 respectively by relay K 2, K3; 3 pin of three-terminal voltage regulator U2 are power supply input pin, are directly connected with working power positive pole.
As shown in Figure 1, coil windings one end of relay K 1, K2, K3 connects one to one with the negative electrode of diode D2, D3, D4 respectively, and be connected with working power positive pole respectively, the coil windings other end of relay K 1, K2, K3 is connected with the anode of diode D2, D3, D4 respectively.
Voltage stabilizing circuit comprises Voltage stabilizing module U1, current-limiting resistance R2, voltage stabilizing didoe D1.
1 pin of Voltage stabilizing module U1 is power supply input pin, is connected, and meets working power GND by voltage stabilizing didoe D1 by current-limiting resistance R2 with working power positive pole; 2 pin of Voltage stabilizing module U1 are GND pin, are directly connected with working power GND; 3 pin of Voltage stabilizing module U1 are+5V output pin, for providing stable voltage to control circuit.
Control circuit comprises counting/frequency divider U3, resistance R3, R4, R5, R6, R7, current-limiting resistance R8, R9, R10, electric capacity C4, C5, triode Q1, Q2, Q3, and touch-switch S1, for realizing LED group dimming function.
1,2,3,4,5,6,7,9,10,11 pin of counting/frequency divider U3 are output pin,
Wherein 1,2,5,6,9,11 pin are unsettled;
3 pin of counting/frequency divider U3 are connected with the base stage of triode Q3 by current-limiting resistance R8;
4 pin of counting/frequency divider U3 are connected with the base stage of triode Q2 by current-limiting resistance R9;
7 pin of counting/frequency divider U3 are connected with the base stage of triode Q1 by current-limiting resistance R10, and the emitter of triode Q1, Q2, Q3 is all connected with GND; Such as, the emitter of triode Q1, Q2, Q3 is connected with GND respectively;
10 pin of counting/frequency divider U3 are connected with 3 pin of Voltage stabilizing module U1 by resistance R6, and are connected with its 15 pin by resistance R7;
8 pin of counting/frequency divider U3 are GND pin, are directly connected with working power GND;
12 pin of counting/frequency divider U3 are carry output pin, unsettled;
13 pin of counting/frequency divider U3 are time constraints input pin, are connected by resistance R5 with GND;
14 pin of counting/frequency divider U3 are clock input pin, and as dimming control signal input sample pin, high level is effective, is connected with 3 pin of Voltage stabilizing module U1 by resistance R3, touch-switch S1, also by the resistance R4 after parallel connection and electric capacity C4, is connected with GND;
15 pin of counting/frequency divider U3 are reset input pin, are connected by electric capacity C5 with GND;
16 pin of counting/frequency divider U3 are power supply input pin, are directly connected with 3 pin of Voltage stabilizing module U1.
The collector electrode of triode Q1, Q2, Q3 also connects one to one with the anode of diode D2, D3, D4 respectively.As shown in Figure 1, namely the collector electrode of triode Q1 is connected with the anode of diode D2, and the collector electrode of triode Q2 is connected with the anode of diode D3, and the collector electrode of triode Q3 is connected with the anode of diode D4.
LED group negative electrode is connected with GND.
Be applied to example, preferably, the positive pole that described LED dimming driving circuit also comprises storage capacitor C1 and Surge suppression resistance R1, storage capacitor C1 is connected with working power positive pole, Surge suppression resistance R1 one end is connected with the negative pole of storage capacitor C1, and the other end is connected with working power GND.
Be applied to above-mentioned each example, preferably, in described LED dimming driving circuit, voltage stabilizing circuit also comprises smooth electric capacity C2 and high frequency capacitance C3, and after both parallel connections, one end is connected with 2 pin of Voltage stabilizing module U1, and the other end is connected with 3 pin of Voltage stabilizing module U1.
Be applied to above-mentioned each example, preferably, as shown in Figure 1, in described LED dimming driving circuit, the emitter of triode Q1, Q2, Q3, and LED group negative electrode connects altogether.And for example, the position of all earth connections power ground connection all altogether.
Be applied to above-mentioned each example, preferably, in described LED dimming driving circuit, Voltage stabilizing module U1 is LM7805, and three-terminal voltage regulator U2 is LM317, and counting/frequency divider U3 is CD4017; Voltage stabilizing didoe D1 is 15V/0.5W, and diode D2, D3, D4 are SS14; Triode Q1, Q2, Q3 are C945; Relay K 1, K2, K3 are 24V/1A; Storage capacitor C1 is 470 μ F/50V, and smooth electric capacity C2 is 22 μ F/16V, and electric capacity C3, C4, C5 are 103 electric capacity, i.e. 0.01 μ F; Resistance R1, R2, R8, R9, R10 resistance is identical, is 1k Ω; Resistance R3 resistance is 100k Ω; Resistance R4 resistance is 1.5M Ω; Resistance R5, R6 resistance is identical, is 10k Ω; Resistance R7 resistance is 200k Ω; Resistance R11 resistance is 4.3 Ω; Resistance R12 resistance is 39 Ω; Resistance R13 resistance is 30 Ω.
Be applied to above-mentioned each example, preferably, in described LED dimming driving circuit, described working power is DC supply, and such as, described DC supply is 24V.
Provide a concrete example below again, a kind of LED dimming driving circuit, as shown in Figure 1, described control circuit adopts DC24V as working power, and LED is all operated in constant current state.In order to ensure the supply voltage not frequent fluctuation by ectocine, put storage capacitor C1 so be sidelong at DC power anode; In order to suppress the surge current of powered on moment, connect Surge suppression resistance R1 between the negative pole of storage capacitor C1 is to GND; Because 24V voltage is far beyond the operating voltage of counting/frequency divider U3, so add Voltage stabilizing module U1 to provide+5V voltage for it; Power supply by three-terminal voltage regulator U2, sampling resistor R11, R12 or R13, relay K 1, K2 or K3, thus provides constant operation electric current for LED group; By counting/frequency divider U3, control that triode Q1, Q2, Q3 is single, combination of two or three combination conductings, thus realize the combination of current-limiting resistance R8, R9, R10 resistance, realize LED group dimming function.
That is, in order to ensure that input supply voltage steadily fluctuates and suppresses the surge current of powered on moment, to have connected electrochemical capacitor C1 and resistance R1 at the side of the positive electrode of power supply and negative side.
1 pin of Voltage stabilizing module U1 is power supply input pin, is connected with the positive pole of power supply by current-limiting resistance R2, and in order to prevent, supply voltage is too high instantaneously can not damage Voltage stabilizing module U1, so meet voltage stabilizing didoe D1 at its 1 pin to GND; 2 pin are GND pin, are directly connected with power supply GND; 3 pin are+5V output pin, in order to ensure output voltage stabilization and the high frequency spurs in power supply signal is coupled in filtering, increase smooth electric capacity C2 and high frequency capacitance C3 at the side of the positive electrode of+5V and GND.
1,2,3,4,5,6,7,9,10,11 pin of counting/frequency divider U3 are output pin, wherein 1,2,5,6,9,11 pin do not define, so unsettled need not, 3 pin are connected with the base stage of triode Q3 by current-limiting resistance R8,4 pin are connected with the base stage of triode Q2 by current-limiting resistance R9,7 pin are connected with the base stage of triode Q1 by current-limiting resistance R10, the emitter of triode Q1, Q2, Q3 is all connected with GND, 10 pin are connected with 3 pin of Voltage stabilizing module U1 by resistance R6, and are connected with its 15 pin by resistance R7; 8 pin are GND pin, are directly connected with power supply GND; 12 pin are not carry output pin, not definition, thus unsettled need not; 13 pin are time constraints input pin, are connected by resistance R5 with GND; 14 pin are clock input pin, and as dimming control signal input sample pin, high level is effective, is connected, is connected by resistance R4, electric capacity C4 with GND by resistance R3, touch-switch S1 with 3 pin of Voltage stabilizing module U1; 15 pin are reset input pin, are connected by filter capacitor C5 with GND; 16 pin are power supply input pin, are directly connected with 3 pin of Voltage stabilizing module U1.
1 pin of three-terminal voltage regulator U2 is output pin, and be connected with LED group anode by current sampling resistor R11, R12 or R13, relay K 1, K2 or K3, LED group negative electrode is connected with GND; 2 pin are sampling feedback pin, are directly connected with current sampling resistor R11, and are connected with resistance R12, R13 respectively by relay K 2, K3; 3 pin are power supply input pin, are directly connected with positive source; Coil windings one end of relay K 1, K2 or K3 is connected with the negative electrode of diode D2, D3 or D4, positive source, and the other end is connected with the anode of diode D2, D3 or D4, the collector electrode of triode Q1, Q2 or Q3.
Go on to say a certain specific works situation of above-described embodiment below again.As shown in Figure 1, after switching on power, Voltage stabilizing module U1, counting/frequency divider U3, three-terminal voltage regulator U2 obtain electric work, 3 pin of counting/frequency divider U3 export high level, and 2,4,7 pin are low level, by the control of current-limiting resistance R8, R9, R10, triode Q1, Q2, Q3, relay K 1, relay K 2 normally opened contact disconnect, relay K 3 normally-closed contact disconnects, and whole LED group loop is open circuit, and LED group is OFF state;
First time pressing touch-switch S1,2 pin of counting/frequency divider U3 export high level, 3,4,7 pin export and are low level, by current-limiting resistance R8, R9, R10, the control of triode Q1, Q2, Q3, relay K 1, relay K 2 normally opened contact disconnect, and relay K 3 normally-closed contact closes, for LED group forms closed-loop path, LED is with the first frequency modulated light work pattern;
Second time pressing touch-switch S1,4 pin of counting/frequency divider U3 export high level, 3,2,7 pin export and are low level, by current-limiting resistance R8, R9, R10, the control of triode Q1, Q2, Q3, the normally opened contact of relay K 1 disconnects, relay K 2 normally opened contact closes, relay K 3 normally-closed contact closes, and for LED group forms closed-loop path, LED works with second gear optical mode;
Third time pressing touch-switch S1,7 pin of counting/frequency divider U3 export high level, 3,2,4 pin export and are low level, by current-limiting resistance R8, R9, R10, the control of triode Q1, Q2, Q3, the normally opened contact of relay K 1 closes, relay K 2 normally opened contact disconnects, relay K 3 normally-closed contact closes, and for LED group forms closed-loop path, LED works with third gear optical mode;
4th pressing touch-switch S1,3 pin of counting/frequency divider U3 export high level, 2,4,7 pin are low level, by current-limiting resistance R8, R9, R10, the control of triode Q1, Q2, Q3, relay K 1, relay K 2 normally opened contact disconnect, and relay K 3 normally-closed contact disconnects, whole LED group loop is open circuit, and LED group is OFF state.
Like this, LED group is often planted operating state and is constant current operation, thus ensure that the safe and reliable work of LED.Smooth electric capacity C2, high frequency capacitance C3 and high frequency capacitance C4 arrive constant current integrated chip U1, and LED light source group obtains and electricly namely starts with constant current work, like this, adopt constant current integrated chip to drive, can carry out light modulation and guarantee the reliable and stable work of LED; That is circuit is simple and convenient, reliable and stable.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention; Further, each technical characteristic listed above, it mutually combines and can form each embodiment, should be regarded as the scope belonging to specification of the present invention record.For the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.

Claims (9)

1. a LED dimming driving circuit, is characterized in that, comprises working power, voltage stabilizing circuit, constant-current circuit, control circuit and LED group;
Constant-current circuit comprises three-terminal voltage regulator U2, current sampling resistor R11, current sampling resistor R12, current sampling resistor R13, relay K 1, relay K 2, relay K 3, for providing constant operation electric current for LED group; 1 pin of three-terminal voltage regulator U2 is output pin, be connected respectively to current sampling resistor R11, current sampling resistor R12, current sampling resistor R13, the other end of current sampling resistor R11, current sampling resistor R12, current sampling resistor R13, is connected to LED group anode respectively by relay K 1, relay K 2, relay K 3; 2 pin are sampling feedback pin, are connected with output pin 1 pin by current sampling resistor R11, and 2 pin are connected with current sampling resistor R12 by relay K 1, relay K 2, and 2 pin are connected with current sampling resistor R13 by relay K 1, relay K 3; 3 pin are power supply input pin, are directly connected with working power positive pole; Coil windings one end of relay K 1, relay K 2, relay K 3 connects one to one with the negative electrode of diode D2, diode D3, diode D4 respectively, and be connected with working power positive pole respectively, the other end is connected with the anode of diode D2, diode D3, diode D4 respectively;
Voltage stabilizing circuit comprises Voltage stabilizing module U1, current-limiting resistance R2, voltage stabilizing didoe D1; 1 pin of Voltage stabilizing module U1 is power supply input pin, is connected, and meets working power GND by voltage stabilizing didoe D1 by current-limiting resistance R2 with working power positive pole; 2 pin are GND pin, are directly connected with working power GND; 3 pin are+5V output pin;
Control circuit comprises counting/frequency divider U3, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, current-limiting resistance R8, current-limiting resistance R9, current-limiting resistance R10, electric capacity C4, electric capacity C5, triode Q1, triode Q2, triode Q3, and touch-switch S1, for realizing LED group dimming function; 1,2,3,4,5,6,7,9,10,11 pin of counting/frequency divider U3 are output pin, wherein 1,2,5,6,9,11 pin are unsettled, 3 pin are connected with the base stage of triode Q3 by current-limiting resistance R8,4 pin are connected with the base stage of triode Q2 by current-limiting resistance R9,7 pin are connected with the base stage of triode Q1 by current-limiting resistance R10, the emitter of triode Q1, triode Q2, triode Q3 is all connected with GND, 10 pin are connected with 3 pin of Voltage stabilizing module U1 by resistance R6, and are connected with its 15 pin by resistance R7; 8 pin are GND pin, are directly connected with working power GND; 12 pin are carry output pin, unsettled; 13 pin are time constraints input pin, are connected by resistance R5 with GND; 14 pin are clock input pin, and as dimming control signal input sample pin, high level is effective, is connected with 3 pin of Voltage stabilizing module U1 by resistance R3, touch-switch S1, also by the resistance R4 after parallel connection and electric capacity C4, is connected with GND; 15 pin are reset input pin, are connected by electric capacity C5 with GND; 16 pin are power supply input pin, are directly connected with 3 pin of Voltage stabilizing module U1; The collector electrode of triode Q1, triode Q2, triode Q3 also connects one to one with the anode of diode D2, diode D3, diode D4 respectively;
LED group negative electrode is connected with GND; Voltage stabilizing module U1 is LM7805, and three-terminal voltage regulator U2 is LM317, and counting/frequency divider U3 is CD4017;
By counting/frequency divider U3, control that triode Q1, Q2, Q3 is single, combination of two or three combination conductings, realize LED group dimming function.
2. LED dimming driving circuit according to claim 1, it is characterized in that, also comprise storage capacitor C1 and Surge suppression resistance R1, the positive pole of storage capacitor C1 is connected with working power positive pole, Surge suppression resistance R1 one end is connected with the negative pole of storage capacitor C1, and the other end is connected with working power GND.
3. LED dimming driving circuit according to claim 2, is characterized in that, described voltage stabilizing circuit also comprises smooth electric capacity C2 and high frequency capacitance C3, and after both parallel connections, one end is connected with 2 pin of Voltage stabilizing module U1, and the other end is connected with 3 pin of Voltage stabilizing module U1.
4. LED dimming driving circuit according to claim 3, is characterized in that, the emitter of triode Q1, triode Q2, triode Q3, and LED group negative electrode connects altogether.
5. LED dimming driving circuit according to claim 4, is characterized in that, voltage stabilizing didoe D1 is 15V/0.5W, and diode D2, diode D3, diode D4 are SS14; Triode Q1, triode Q2, triode Q3 are C945; Relay K 1, relay K 2, relay K 3 are 24V/1A.
6. LED dimming driving circuit according to claim 5, is characterized in that, storage capacitor C1 is 470 μ F/50V, and smooth electric capacity C2 is 22 μ F/16V, electric capacity C3, electric capacity C4, electric capacity C5 are 103 electric capacity.
7. LED dimming driving circuit according to claim 6, is characterized in that, resistance R1, resistance R2, resistance R8, resistance R9, resistance R10 resistance are identical, are 1k Ω; Resistance R3 resistance is 100k Ω; Resistance R4 resistance is 1.5M Ω; Resistance R5, resistance R6 resistance are identical, are 10k Ω; Resistance R7 resistance is 200k Ω; Resistance R11 resistance is 4.3 Ω; Resistance R12 resistance is 39 Ω; Resistance R13 resistance is 30 Ω.
8., according to the arbitrary described LED dimming driving circuit of claim 1 to 7, it is characterized in that, described working power is DC supply.
9. LED dimming driving circuit according to claim 8, is characterized in that, described DC supply is 24V.
CN201010554920.XA 2010-11-23 2010-11-23 LED (light emitting diode) dimming drive circuit Expired - Fee Related CN102480815B (en)

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CN101742770A (en) * 2009-12-23 2010-06-16 海洋王照明科技股份有限公司 LED light dimming circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100054053A (en) * 2008-11-13 2010-05-24 주식회사 비엔씨넷 Constant current type led driver circuit for led stoplight
CN101742770A (en) * 2009-12-23 2010-06-16 海洋王照明科技股份有限公司 LED light dimming circuit

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