CN209914125U - Voltage control dimming LED lamp circuit - Google Patents

Abstract

The utility model discloses a voltage control LED lamp circuit of adjusting luminance, including rectification filter circuit, bleeder circuit, simulation light modulation circuit and LED luminescence circuit, rectification filter circuit can be converted into smooth direct current voltage at its output to the alternating voltage or direct current voltage that its input was inserted and export, bleeder circuit has partial pressure proportion and threshold voltage to export corresponding voltage at its output according to setting for in it, be provided with minimum control voltage threshold value and highest control voltage threshold value among the simulation light modulation circuit, the output current of simulation light modulation circuit's output is according to the voltage adjustment that its control end was inserted; the LED lamp has the advantages that the LED lamp can replace an incandescent lamp and is matched with a voltage regulation controller which outputs alternating current voltage or direct current voltage for use, and the application field of the LED lamp is expanded.

Description

A voltage control dimming LED lamp circuit

technical field

The utility model relates to an LED lamp circuit, in particular to a voltage control dimming LED lamp circuit.

Background technique

Traditional incandescent lamps, as the old generation of electric light sources, have been widely used in various lighting occasions. By operating a switch connected to the power source, conventional incandescent lamps can be controlled to emit light or not. The traditional incandescent lamp is a dimmable light source because of its pure resistance characteristics, and has been widely used in various dimming control circuits.

The existing dimming control circuits are mainly divided into three categories: the phase-cut dimming controller that adopts the phase-cut dimming control method for the AC voltage, the PWM dimming controller that adopts the high-frequency PWM modulation method, and the PWM dimming controller that adopts the changing output voltage. The size of the voltage dimming control mode voltage regulator controller.

Due to the advantages of high luminous efficiency, energy saving and environmental protection, LED lamps have been used in many occasions. Currently, LED lamps have gradually replaced incandescent lamps for phase-cut dimmer circuits and PWM dimming controllers. However, the current LED lamp circuit is mainly designed for the application of the phase-cut dimmer circuit and the PWM dimming controller, and cannot be used in conjunction with the voltage regulation controller, which limits the application field of the LED lamp.

SUMMARY OF THE INVENTION

The technical problem to be solved by the utility model is to provide a voltage-controlled dimming LED lamp circuit that can replace incandescent lamps and is used in conjunction with a voltage regulating controller whose output is AC voltage or DC voltage. The technical solution adopted by the utility model to solve the above technical problems is: a voltage control dimming LED lamp circuit, including a rectification filter circuit, a voltage divider circuit, an analog dimming circuit and an LED lighting circuit, and the rectification filter circuit has a first An input terminal, a second input terminal, an output terminal and a ground terminal, the rectifier and filter circuit can convert the AC voltage or DC voltage connected to the input terminal into a smooth DC voltage and output it at the output terminal. The voltage circuit has an input terminal, an output terminal and a ground terminal. The voltage dividing circuit is set with a voltage dividing ratio and a threshold voltage. When the voltage connected to the input terminal of the voltage dividing circuit is greater than the threshold voltage set in it When , the output terminal of the voltage divider circuit outputs zero voltage, and when the voltage connected to the input terminal of the voltage divider circuit is not greater than the threshold voltage set therein, the voltage divider circuit divides the voltage according to the set voltage The analog dimming circuit has an input terminal, an output terminal, a control terminal and a ground terminal, and the analog dimming circuit is provided with a minimum control voltage. threshold and the highest control voltage threshold, when the voltage connected to the control terminal of the analog dimming circuit is less than the minimum control voltage threshold, the output current of the output terminal of the analog dimming circuit is zero, when the analog dimming circuit When the voltage connected to the control terminal of the circuit is between the minimum control voltage threshold and the maximum control voltage threshold, the output current of the output terminal of the analog dimming circuit changes with the input voltage of the control terminal. When the voltage connected to the control terminal of the optical circuit is greater than the maximum control voltage threshold, the output current of the output terminal of the analog dimming circuit will no longer increase with the increase of the voltage connected to the control terminal, and the LED lighting circuit has: Positive and negative, the first input end and the second input end of the rectifier filter circuit are used to connect the two output ends of the voltage regulation controller, the output end of the rectifier filter circuit, the voltage divider circuit The input terminal, the input terminal of the analog dimming circuit are connected with the negative pole of the LED lighting circuit, the output terminal of the voltage divider circuit is connected with the control terminal of the analog dimming circuit, and the analog The output terminal of the dimming circuit is connected to the positive pole of the LED lighting circuit, and the ground terminal of the rectifier and filter circuit and the ground terminal of the voltage divider circuit are connected to the ground terminal of the analog dimming circuit.

The voltage divider circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a first diode and a first triode, the first diode is a zener diode, and the The first triode is an NPN triode, one end of the first resistor is connected to one end of the third resistor, and its connection end is the input end of the voltage divider circuit, the third resistor The other end of the resistor is connected to the cathode of the first diode, the anode of the first diode, and one end of the fourth resistor is connected to the base of the first transistor, so The other end of the first resistor and one end of the second resistor are connected to the collector of the first triode, and the connection end is the output end of the voltage divider circuit. The other end of the resistor and the other end of the fourth resistor are connected to the emitter of the first triode, and the connection end thereof is the ground end of the voltage divider circuit.

The rectifier filter circuit includes a full-bridge rectifier bridge stack and a first capacitor, the first capacitor is an electrolytic capacitor, and the first pin of the full-bridge rectifier bridge stack is the first input of the rectifier filter circuit terminal, the third pin of the full-bridge rectifier bridge stack is the second input end of the rectifier filter circuit, the second pin of the full-bridge rectifier bridge stack is connected to the positive pole of the first capacitor and The connection end is the output end of the rectifier filter circuit, the fourth pin of the full-bridge rectifier bridge stack is connected to the negative electrode of the first capacitor, and the connection end is the ground end of the rectifier filter circuit . The rectifier and filter circuit can convert the connected AC voltage into a smooth DC voltage output, and can also convert the connected positive DC voltage or negative DC voltage into a positive DC voltage for output at its output end.

The analog dimming circuit includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a second capacitor, a third capacitor, a fourth capacitor, a first inductor, a second diode and an integrated circuit chip, The fourth capacitor is an electrolytic capacitor, the second diode is a fast recovery rectifier diode, the model of the integrated circuit chip is MT7816, one end of the fifth resistor, the eighth resistor One end of the first inductor and one end of the first inductor are connected to the negative electrode of the fourth capacitor and its connection end is the input end of the analog dimming circuit, the other end of the fifth resistor, the One end of the third capacitor is connected to the fourth pin of the integrated circuit chip, the second pin of the integrated circuit chip is connected to one end of the second capacitor, and the connection end is the analog dimming The control end of the circuit, the third pin of the integrated circuit chip is connected to one end of the sixth resistor, the seventh pin of the integrated circuit chip is connected to one end of the seventh resistor, the The fifth pin of the integrated circuit chip, the sixth pin of the integrated circuit chip, and the other end of the first inductor are connected to the anode of the second diode. The negative electrode, the other end of the eighth resistor is connected to the positive electrode of the fourth capacitor, and the connection end is the output end of the analog dimming circuit, the first pin of the integrated circuit chip, the The other end of the sixth resistor, the other end of the seventh resistor, the other end of the second capacitor and the other end of the third capacitor are connected and the connection end is the analog dimming circuit the ground terminal. The circuit adopts a constant current control integrated circuit chip with an analog voltage signal control terminal, and uses the control mode of a switching power supply, which has high power conversion efficiency, simple structure and low cost.

The LED light-emitting circuit is formed by a plurality of LED light-emitting units in parallel, each of the LED light-emitting units is formed by a plurality of LED light-emitting diodes in series, and the positive parallel terminals of the plurality of LED light-emitting units are the LEDs. The positive pole of the light-emitting circuit, and the parallel terminals of the negative poles of the several LED light-emitting units are the negative poles of the LED light-emitting circuit.

Compared with the prior art, the advantage of the utility model lies in that a voltage-controlled dimming LED lamp circuit is constructed by a rectifier filter circuit, a voltage divider circuit, an analog dimming circuit and an LED lighting circuit, and the rectifier filter circuit can connect its input end to the LED lamp circuit. The AC voltage or DC voltage is converted into a smooth DC voltage and output at its output. The voltage divider circuit is set with a voltage divider ratio and a threshold voltage. When the voltage connected to the input end of the voltage divider circuit is greater than the threshold voltage set in it, The output terminal of the voltage divider circuit outputs zero voltage. When the voltage connected to the input terminal of the voltage divider circuit is not greater than the threshold voltage set in it, the voltage divider circuit reduces the voltage connected to its input terminal according to the set voltage divider ratio. Its output terminal is output, and the analog dimming circuit is set with a minimum control voltage threshold and a maximum control voltage threshold. When the voltage connected to the control terminal of the analog dimming circuit is less than the minimum control voltage threshold, the output current of the output terminal of the analog dimming circuit is Zero, when the voltage connected to the control terminal of the analog dimming circuit is between the minimum control voltage threshold and the highest control voltage threshold, the output current of the output terminal of the analog dimming circuit changes with the input voltage of its control terminal. When the voltage connected to the control terminal of the optical circuit is greater than the maximum control voltage threshold, the output current of the output terminal of the analog dimming circuit will no longer increase with the increase of the voltage connected to the control terminal. The output DC voltage is converted by the rectifier filter circuit. The output terminals of the rectifier filter circuit all output DC voltage. This DC voltage is divided by the voltage divider circuit. The output terminal of the voltage divider circuit outputs voltages of different sizes, the analog dimming circuit outputs the corresponding current at its output terminal according to the control voltage input from its control terminal, and the LED lighting circuit emits the corresponding current according to the current size of the output terminal of the analog dimming circuit. Therefore, the utility model can replace the incandescent lamp, and is used in conjunction with a voltage regulating controller whose output is an alternating voltage or a direct current voltage, thereby expanding the application field of the LED lamp.

Description of drawings

Fig. 1 is the structural principle block diagram of the LED lamp circuit of the present invention;

FIG. 2 is a circuit diagram of the LED lamp circuit of the present invention.

Detailed ways

The present utility model will be further described in detail below with reference to the embodiments of the accompanying drawings.

Embodiment: As shown in FIG. 1, in this embodiment, a voltage-controlled dimming LED lamp circuit includes a rectifier and filter circuit, a voltage divider circuit, an analog dimming circuit and an LED lighting circuit. The rectifier and filter circuit has a first input terminal. , the second input terminal, output terminal and ground terminal, the rectifier filter circuit can convert the AC voltage or DC voltage connected to its input terminal into a smooth DC voltage and output at its output terminal, the voltage divider circuit has an input terminal, an output terminal and The ground terminal, the voltage dividing ratio and the threshold voltage are set in the voltage dividing circuit. When the voltage connected to the input terminal of the voltage dividing circuit is greater than the threshold voltage set in it, the output terminal of the voltage dividing circuit outputs zero voltage. When the voltage connected to the input terminal is not greater than the threshold voltage set in it, the voltage divider circuit reduces the voltage connected to the input terminal according to the set voltage divider ratio and outputs it at the output terminal. terminal, control terminal and ground terminal, the analog dimming circuit is set with a minimum control voltage threshold and a maximum control voltage threshold. When the voltage connected to the control terminal of the analog dimming circuit is less than the minimum control voltage threshold, the output terminal of the analog dimming circuit The output current is zero. When the voltage connected to the control terminal of the analog dimming circuit is between the minimum control voltage threshold and the maximum control voltage threshold, the output current of the output terminal of the analog dimming circuit changes with the input voltage of its control terminal. When the voltage connected to the control terminal of the analog dimming circuit is greater than the maximum control voltage threshold, the output current of the output terminal of the analog dimming circuit will no longer increase with the increase of the voltage connected to the control terminal of the analog dimming circuit. The LED lighting circuit has positive and negative electrodes. , the first input end and the second input end of the rectifier filter circuit are used to connect the two output ends of the voltage regulation controller, the output end of the rectifier filter circuit, the input end of the voltage divider circuit, the input end of the analog dimming circuit and the LED The negative terminal of the lighting circuit is connected, the output terminal of the voltage divider circuit is connected to the control terminal of the analog dimming circuit, the output terminal of the analog dimming circuit is connected to the positive terminal of the LED lighting circuit, the ground terminal of the rectifier and filter circuit, and the ground terminal of the voltage divider circuit. Connect to the ground terminal of the analog dimming circuit.

As shown in FIG. 2, in this embodiment, the voltage divider circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first diode D1, and a first transistor Q1. A diode D1 is a zener diode, the first transistor Q1 is an NPN transistor, one end of the first resistor R1 is connected to one end of the third resistor R3 and its connection end is the input end of the voltage divider circuit, the third resistor The other end of R3 is connected to the cathode of the first diode D1, the anode of the first diode D1, one end of the fourth resistor R4 is connected to the base of the first transistor Q1, the other end of the first resistor R1, One end of the second resistor R2 is connected to the collector of the first triode and its connection end is the output end of the voltage divider circuit, the other end of the second resistor R2, the other end of the fourth resistor R4 and the first triode Q1 The emitter is connected and its connection terminal is the ground terminal of the voltage divider circuit.

As shown in FIG. 2, in this embodiment, the rectifier and filter circuit includes a full-bridge rectifier bridge stack Db and a first capacitor C1, the first capacitor C1 is an electrolytic capacitor, and the first pin of the full-bridge rectifier bridge stack Db is the rectifier filter circuit. The first input end, the third pin of the full-bridge rectifier bridge stack Db is the second input end of the rectifier filter circuit, the second pin of the full-bridge rectifier bridge stack Db is connected to the positive pole of the first capacitor C1 and its connection end is the rectifier filter circuit. At the output end of the circuit, the fourth pin of the full-bridge rectifier bridge stack Db is connected to the negative electrode of the first capacitor C1, and its connection end is the ground end of the rectifier filter circuit.

As shown in FIG. 2 , in this embodiment, the analog dimming circuit includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4 , the first inductor, the second diode D2 and the integrated circuit chip U1, the fourth capacitor C4 is an electrolytic capacitor, the second diode D2 is a fast recovery rectifier diode, the model of the integrated circuit chip U1 is MT7816, and the fifth resistor R5 One end of the eighth resistor R8, one end of the first inductor, and the negative electrode of the fourth capacitor C4 are connected with the input end of the analog dimming circuit, the other end of the fifth resistor R5, the third capacitor C3 One end is connected to the fourth pin of the integrated circuit chip U1, the second pin of the integrated circuit chip U1 is connected to one end of the second capacitor C2, and the connection end is the control end of the analog dimming circuit, and the third pin of the integrated circuit chip U1 and the second capacitor C2 are connected. One end of the sixth resistor R6 is connected, the seventh pin of the integrated circuit chip U1 is connected to one end of the seventh resistor R7, the fifth pin of the integrated circuit chip U1, the sixth pin of the integrated circuit chip U1, the other end of the first inductor and The anode of the second diode D2 is connected, the cathode of the second diode D2, the other end of the eighth resistor R8 and the anode of the fourth capacitor C4 are connected and the connection end is the output end of the analog dimming circuit, the integrated circuit chip The first pin of U1, the other end of the sixth resistor R6, the other end of the seventh resistor R7, the other end of the second capacitor C2 and the other end of the third capacitor C3 are connected and the connection end is the ground end of the analog dimming circuit .

As shown in FIG. 2 , in this embodiment, the LED light-emitting circuit is formed by a plurality of LED light-emitting units in parallel, each LED light-emitting unit is formed by a plurality of LED light-emitting diodes (LED1-LEDn) in series, and n is an integer greater than or equal to 1 The positive parallel terminals of several LED lighting units are the positive terminals of the LED lighting circuit, and the negative parallel terminals of the several LED lighting units are the negative terminals of the LED lighting circuit.

Claims (5)

1. A voltage control dimming LED lamp circuit is characterized by comprising a rectifying filter circuit, a voltage division circuit, an analog dimming circuit and an LED light-emitting circuit, wherein the rectifying filter circuit is provided with a first input end, a second input end, an output end and a grounding end, the rectifying filter circuit can convert alternating current voltage or direct current voltage accessed by the input end of the rectifying filter circuit into smooth direct current voltage to be output at the output end of the rectifying filter circuit, the voltage division circuit is provided with an input end, an output end and a grounding end, a voltage division ratio and a threshold voltage are set in the voltage division circuit, when the voltage accessed by the input end of the voltage division circuit is greater than the threshold voltage set in the voltage division circuit, the output end of the voltage division circuit outputs zero voltage, when the voltage accessed by the input end of the voltage division circuit is not greater than the threshold voltage set in the voltage division circuit, the voltage accessed by the input end of the voltage division circuit is reduced according to, the analog dimming circuit is provided with an input end, an output end, a control end and a grounding end, a lowest control voltage threshold and a highest control voltage threshold are arranged in the analog dimming circuit, when the voltage accessed by the control end of the analog dimming circuit is smaller than the lowest control voltage threshold, the output current of the output end of the analog dimming circuit is zero, when the voltage accessed by the control end of the analog dimming circuit is between the lowest control voltage threshold and the highest control voltage threshold, the output current of the output end of the analog dimming circuit changes along with the input voltage of the control end of the analog dimming circuit, when the voltage accessed by the control end of the analog dimming circuit is larger than the highest control voltage threshold, the output current of the output end of the analog dimming circuit does not increase along with the increase of the voltage accessed by the control end of the analog dimming circuit, and the LED light-emitting circuit is provided with a positive pole and a negative pole, the first input end and the second input end of the rectification filter circuit are used for being connected with two output ends of the voltage regulation controller, the output end of the rectification filter circuit, the input end of the voltage division circuit, the input end of the analog dimming circuit and the negative electrode of the LED light-emitting circuit are connected, the output end of the voltage division circuit and the control end of the analog dimming circuit are connected, the output end of the analog dimming circuit and the positive electrode of the LED light-emitting circuit are connected, and the grounding end of the rectification filter circuit, the grounding end of the voltage division circuit and the grounding end of the analog dimming circuit are connected.

2. A voltage controlled dimming LED lamp circuit as claimed in claim 1, wherein the voltage dividing circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first diode and a first triode, the first diode is a zener diode, the first triode is an NPN type triode, one end of the first resistor is connected to one end of the third resistor and its connection end is the input end of the voltage dividing circuit, the other end of the third resistor is connected to the negative electrode of the first diode, the positive electrode of the first diode, one end of the fourth resistor and the base of the first triode are connected, the other end of the first resistor, one end of the second resistor and the collector of the first triode are connected and its connection end is the output end of the voltage dividing circuit, the other end of the second resistor and the other end of the fourth resistor are connected with the emitter of the first triode, and the connecting end of the second resistor and the emitter of the fourth resistor is the grounding end of the voltage division circuit.

3. A voltage controlled dimming LED lamp circuit according to claim 1, wherein the rectifying and filtering circuit comprises a full bridge rectifier and a first capacitor, the first capacitor is an electrolytic capacitor, the 1 st pin of the full bridge rectifier is the first input terminal of the rectifying and filtering circuit, the 3 rd pin of the full bridge rectifier is the second input terminal of the rectifying and filtering circuit, the 2 nd pin of the full bridge rectifier and the positive terminal of the first capacitor are connected and the connection terminal thereof is the output terminal of the rectifying and filtering circuit, the 4 th pin of the rectifying and full bridge rectifier and the negative terminal of the first capacitor are connected and the connection terminal thereof is the ground terminal of the rectifying and filtering circuit.

4. A voltage controlled dimming LED lamp circuit according to claim 1, wherein the analog dimming circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a second capacitor, a third capacitor, a fourth capacitor, a first inductor, a second diode and an integrated circuit chip, the fourth capacitor is an electrolytic capacitor, the second diode is a fast recovery rectifier diode, the integrated circuit chip has a model MT7816, one end of the fifth resistor, one end of the eighth resistor, one end of the first inductor, and a negative electrode of the fourth capacitor are connected and a connection end thereof is the input end of the analog dimming circuit, the other end of the fifth resistor, one end of the third capacitor and a 4 th pin of the integrated circuit chip are connected, a 2 nd pin of the integrated circuit chip is connected with one end of the second capacitor and a connection end thereof is the control end of the analog dimming circuit And the 3 rd pin of the integrated circuit chip is connected with one end of the sixth resistor, the 7 th pin of the integrated circuit chip is connected with one end of the seventh resistor, the 5 th pin of the integrated circuit chip, the 6 th pin of the integrated circuit chip, the other end of the first inductor and the anode of the second diode are connected, the cathode of the second diode, the other end of the eighth resistor and the anode of the fourth capacitor are connected, the connecting end of.

5. A voltage control dimming LED lamp circuit according to claim 1, wherein the LED lighting circuit is formed by connecting a plurality of LED lighting units in parallel, each LED lighting unit is formed by connecting a plurality of LED lighting diodes in series, the parallel connection end of the positive electrodes of the plurality of LED lighting units is the positive electrode of the LED lighting circuit, and the parallel connection end of the negative electrodes of the plurality of LED lighting units is the negative electrode of the LED lighting circuit.

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