CN219459347U - Non-isolated LED lamp circuit with dimming of 0-10V - Google Patents

Abstract

The utility model discloses a 0-10V dimming non-isolated LED lamp circuit, which comprises a dimming power supply circuit and an LED light-emitting circuit, wherein the dimming power supply circuit comprises a rectifying circuit, a boosting constant voltage circuit, a dimming constant current circuit and a voltage sampling circuit; the light-emitting diode has the advantages that a two-stage conversion mode is adopted, low harmonic input and low ripple output are achieved, the light frequency flash during light emission can be reduced, and the light-emitting diode has high conversion efficiency.

Description

A 0-10V dimming non-isolated LED lamp circuit

technical field

The utility model relates to a 0-10V dimming LED lamp circuit, in particular to a 0-10V dimming non-isolated LED lamp circuit.

Background technique

0-10V dimming LED lamps usually have a live line input terminal and a neutral line input terminal for connecting to the mains voltage, and a positive terminal for connecting to the voltage signal (that is, the dimming signal) output by the 0-10V dimmer. signal terminal and negative signal terminal. When the positive signal terminal and negative signal terminal of the 0-10V dimming LED lamp are connected to the 0-10V dimmer, when the 0-10V dimmer outputs a voltage signal representing the light, the 0-10V dimming LED The luminous intensity of the lamp corresponds to the voltage signal output by the 0-10V dimmer. The larger the voltage signal output by the 0-10V dimmer, the stronger the luminous brightness of the 0-10V dimmed LED lamp, and vice versa. The smaller the voltage signal output by the dimmer, the smaller the luminance of the 0-10V dimmed LED lamp. When the 0-10V dimmer outputs a voltage signal representing turning off the light, the 0-10V dimming LED lamp circuit does not emit light.

The traditional 0-10V dimming LED lighting circuit usually includes a dimming power supply circuit and an LED lighting circuit. The dimming power supply circuit is connected to the LED lighting circuit. Convert it to DC current to drive the LED light emitting circuit to emit light. The magnitude of the DC current output by the dimming power supply circuit corresponds to the magnitude of the dimming signal connected to the 0-10V dimming LED lamp circuit.

Because the traditional 0-10V dimming LED lamp circuit adopts a single-stage isolation conversion method, not only the conversion efficiency is low, but also its output current has a large ripple, so the traditional 0-10V dimming LED lamp is Has a larger light strobe.

Contents of the invention

The technical problem to be solved by the utility model is to provide a 0-10V dimming non-isolated LED lamp circuit. The 0-10V dimming non-isolated LED lamp circuit adopts a two-stage conversion method to achieve low harmonic input and low ripple Wave output, can reduce light flicker when emitting light, and has high conversion efficiency.

The technical solution adopted by the utility model to solve the above technical problems is: a 0-10V dimming non-isolated LED lamp circuit, which has a live wire input terminal and a neutral wire input terminal for connecting to the mains voltage, and is used for connecting Input the positive signal terminal and the negative signal terminal of the voltage signal output by the 0-10V dimmer, the non-isolated LED lighting circuit for 0-10V dimming includes a dimming power supply circuit and an LED lighting circuit, and the LED lighting circuit It has a positive pole and a negative pole. The dimming power supply circuit includes a rectifier circuit, a boost constant voltage circuit, a dimming constant current circuit and a voltage sampling circuit. The rectifier circuit has a live wire input end, a neutral wire input end, and a positive output end and a negative output terminal, the step-up constant voltage circuit has an input terminal, an output terminal and a negative pole, and the dimming constant current circuit adopts a non-isolated step-down conversion method, and has a positive pole, a negative pole, an output terminal, and a positive pole of a detection terminal and the negative pole of the detection terminal, the voltage sampling circuit has a positive input terminal, a negative input terminal, a positive output terminal and a negative output terminal, the positive pole of the LED lighting circuit, the positive pole of the dimming constant current circuit and the The output terminal of the step-up constant voltage circuit is connected, the negative pole of the LED lighting circuit is connected to the output terminal of the dimming constant current circuit, the positive pole of the detection terminal of the dimming constant current circuit is connected to the voltage The positive output terminal of the sampling circuit is connected, the negative pole of the detection terminal of the dimming constant current circuit is connected with the negative output terminal of the voltage sampling circuit, the negative pole of the dimming constant current circuit, the voltage boost constant The negative pole of the voltage circuit is connected to the negative output terminal of the rectifier circuit, the live wire input terminal of the rectifier circuit is connected to the live wire input terminal of the 0-10V dimming non-isolated LED lamp circuit, and the rectifier circuit The neutral line input terminal of the circuit is connected to the neutral line input terminal of the 0-10V dimming non-isolated LED lamp circuit, and the positive input terminal of the voltage sampling circuit is connected to the 0-10V dimming non-isolated LED lamp circuit. The positive signal terminal of the LED lamp circuit is connected, and the negative input terminal of the voltage sampling circuit is connected with the negative signal terminal of the 0-10V dimming non-isolated LED lamp circuit.

The boost constant voltage circuit also has an enabling terminal, the dimming constant current circuit also has a state signal terminal, the enabling terminal of the boosting constant voltage circuit and the dimming constant current circuit The state signal terminal is connected, the enabling terminal of the boost constant voltage circuit is used to access the voltage signal entering the working state or the dormant state, and the state signal terminal of the dimming constant current circuit is used to output the voltage signal entering the working state Or dormant voltage signal. In the 0-10V dimming non-isolated LED lamp circuit, when the output current of the output terminal of the dimming constant current circuit is not zero, its state signal terminal can output a voltage signal entering the working state. When the output current of the output terminal of the circuit is zero, its state signal terminal can output the voltage signal entering the dormant state. When the enabling terminal of the boost constant voltage circuit is connected to the voltage signal entering the working state, the boost constant voltage circuit It is in the working state and is working normally. When the enable terminal of the boost constant voltage circuit is connected to the voltage signal of the dormant state, the boost constant voltage circuit is in the dormant state and stops working. The energy consumed by the boost constant voltage circuit in the dormant state The electric energy is the lowest; therefore, when the LED light-emitting circuit is not emitting light, the boost constant voltage circuit is in a non-working state, thereby further reducing the circuit power consumption of the 0-10V dimming non-isolated LED lamp circuit when not emitting light.

The dimming constant current circuit includes a first integrated circuit model of SY5983, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, The ninth resistor, the tenth resistor, the first diode, the second diode, the third diode, the fourth diode, the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth Capacitor, first NMOS tube and first inductance, the fifth capacitor is an electrolytic capacitor, the first diode is a Zener diode, the second diode, the third diode Both the tube and the fourth diode are rectifier diodes, the first inductance includes two coils, and the two coils are respectively called the first coil and the second coil, and one end of the first resistor It is connected to one end of the second resistor, and its connection end is the state signal end of the dimming constant current circuit, and the other end of the first resistor is connected to the anode of the first diode , the cathode of the first diode, the cathode of the second diode, the anode of the third diode are connected to one end of the first capacitor, and the second two The positive pole of the pole tube is connected to one end of the fifth resistor, the other end of the fifth resistor, one end of the third resistor is connected to one end of the second coil, and the third resistor The other end of the fourth resistor, one end of the fourth resistor is connected to the second pin of the first integrated circuit, one end of the second capacitor, one end of the sixth resistor is connected to the first integrated circuit The first pin of the circuit is connected, the other end of the sixth resistor is connected to one end of the third capacitor, one end of the fourth capacitor is connected to the fifth pin of the first integrated circuit, and Its connection terminal is the positive pole of the detection terminal of the dimming constant current circuit, the sixth pin of the first integrated circuit is the negative pole of the detection terminal of the dimming constant current circuit, and the third diode The negative pole of the said seventh resistor is connected to the 8th pin of the first integrated circuit, and the gate of the first NMOS transistor is connected to the 4th pin of the first integrated circuit, so The source of the first NMOS transistor, one end of the eighth resistor and one end of the ninth resistor are connected, and the other end of the eighth resistor is connected to the third pin of the first integrated circuit connected, the drain of the first NMOS transistor, the anode of the fourth diode are connected to one end of the first coil, the other end of the first coil, the fifth capacitor The negative pole of the negative pole is connected to one end of the tenth resistor, and the connected end is the output end of the dimming constant current circuit, the other end of the seventh resistor, the other end of the tenth resistor, The cathode of the fourth diode is connected to the anode of the fifth capacitor, and its connection end is the anode of the dimming constant current circuit, the other end of the second resistor, the The other end of the fourth resistor, the other end of the ninth resistor, the other end of the first capacitor, the other end of the second capacitor, the other end of the third capacitor, the The other end of the fourth capacitor is connected to the seventh pin of the first integrated circuit and the other end of the second coil, and the connection end is the negative pole of the dimming constant current circuit. The dimming constant current circuit utilizes the DC voltage output by the output terminal of the step-up constant voltage circuit as a constant voltage, and changes the first integrated circuit model SY5983 from a conventional isolation conversion application to a step-down constant current conversion application, because No matter how the mains voltage fluctuates, the DC voltage output by the output terminal of the step-up constant voltage circuit remains unchanged, so the current output by the output terminal of the dimming constant current circuit adjusted to step-down constant current conversion remains constant, which has a better Linear adjustment rate.

The voltage sampling circuit includes an eleventh resistor, a fifth diode, a sixth diode, a sixth capacitor, a seventh capacitor and a high-frequency transformer, the sixth capacitor is an electrolytic capacitor, and the high The frequency transformer includes a primary coil and a secondary coil, one end of the eleventh resistor is the positive output end of the voltage sampling circuit, the other end of the eleventh resistor is connected to the fifth diode The positive pole of the fifth diode is connected to the negative pole of the fifth diode and one end of the primary coil of the high-frequency transformer, and the other end of the primary coil of the high-frequency transformer is the negative output of the voltage sampling circuit end, one end of the secondary coil of the high-frequency transformer is connected to the anode of the sixth diode, the cathode of the sixth diode, the anode of the sixth capacitor and the first One end of the seven capacitors is connected, and its connection end is the positive input end of the voltage sampling circuit, the other end of the secondary coil of the high frequency transformer, the negative pole of the sixth capacitor and the seventh The other end of the capacitor is connected to the negative input end of the voltage sampling circuit.

The boost constant voltage circuit includes a second integrated circuit model of MT9750, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, a tenth resistor Eighth resistor, nineteenth resistor, eighth capacitor, ninth capacitor, tenth capacitor, eleventh capacitor, twelfth capacitor, thirteenth capacitor, fourteenth capacitor, seventh diode, eighth dipole tube, the ninth diode, the second NMOS tube and the second inductor, the seventh diode, the eighth diode and the ninth diode are all rectifier diodes, and the The fourteenth capacitor is an electrolytic capacitor, the second inductor has two coils, and the two coils are respectively called the third coil and the fourth coil, one end of the eighth capacitor, the tenth coil One end of the three resistors is connected to one end of the third coil, and its connection end is the positive pole of the boost constant voltage circuit, the other end of the thirteenth resistor, the ninth diode One end of the tenth capacitor is connected to the eighth pin of the second integrated circuit, one end of the nineteenth resistor is connected to the fifth pin of the second integrated circuit, and the The anode of the ninth diode, the cathode of the eighth diode are connected to one end of the twelfth resistor, and the other end of the twelfth resistor is connected to one end of the ninth capacitor connection, the other end of the ninth capacitor, the other end of the nineteenth resistor and one end of the fourth coil are connected, the second pin of the second integrated circuit, the tenth One end of a capacitor is connected to one end of the fourteenth resistor, the other end of the fourteenth resistor is connected to one end of the twelfth capacitor, the seventh pin of the second integrated circuit is connected to the The gate of the second NMOS transistor is connected, the 4th pin of the second integrated circuit, the source of the second NMOS transistor are connected to one end of the fifteenth resistor, and the second The third pin of the integrated circuit is the enabling end of the boost constant voltage circuit, the first pin of the second integrated circuit, one end of the thirteenth capacitor, and the seventeenth resistor One end is connected to one end of the eighteenth resistor, the other end of the seventeenth resistor is connected to one end of the sixteenth resistor, the other end of the sixteenth resistor, the first The cathode of the seven diodes is connected to the anode of the fourteenth capacitor, and its connection end is the output end of the boost constant voltage circuit, the anode of the seventh diode, the anode of the first The other end of the three coils is connected to the drain of the second NMOS transistor, the other end of the fifteenth resistor, the other end of the eighteenth resistor, the other end of the eighth capacitor, The other end of the tenth capacitor, the other end of the eleventh capacitor, the other end of the twelfth capacitor, the other end of the thirteenth capacitor, the fourteenth capacitor The cathode of the eighth diode, the anode of the eighth diode, the sixth pin of the second integrated circuit and the other end of the fourth coil are connected, and the connection end is the boost constant voltage circuit the negative pole. In the step-up constant voltage circuit, the second integrated circuit of the type MT9570 has an enabling terminal, and by associating the enabling terminal with the output current of the output terminal of the dimming constant current circuit, the When the output current of the output terminal is not zero, it enters the working state, and when the output current of the output terminal of the dimming constant current circuit is zero, it enters the dormant state. On the basis of not increasing additional costs, the power consumption is reduced to achieve low cost energy saving.

Compared with the prior art, the utility model has the advantage that the dimming power supply circuit is composed of a rectifying circuit, a boosting constant voltage circuit, a dimming constant current circuit and a voltage sampling circuit, and the rectifying circuit is used to connect the live wire input end and the neutral wire The AC voltage connected to the input terminal is converted into a pulsating DC voltage, and the step-up constant voltage circuit is used to convert the pulsating DC voltage connected to its input terminal into a constant DC voltage output at its output terminal; the dimming constant current circuit is used for According to the external dimming signal, the output current of the output terminal is set. The positive pole and the negative pole of the detection terminal of the dimming constant current circuit are used to detect the DC voltage of the externally connected dimming signal. The output terminal of the dimming constant current circuit It is used to output a constant current to drive the LED light-emitting circuit to emit light according to the DC voltage detected by the positive pole of the detection terminal and the negative pole of the detection terminal. The luminous intensity of the LED light-emitting circuit is proportional to the current connected between the positive pole and the negative pole. The live wire input terminal and neutral wire input terminal of the dimming non-isolated LED lamp circuit are connected to the live wire and neutral wire of the mains, and when the positive signal terminal and negative signal terminal are connected to a 0-10V dimmer, the live wire input terminal of the rectifier circuit and The mains voltage is connected between the input terminals of the neutral line, the voltage signal output by the 0-10V dimmer is connected to the positive input terminal and negative input terminal of the voltage sampling circuit, and the pulsating voltage is output between the positive output terminal and the negative output terminal of the rectifier circuit. The voltage constant voltage circuit converts the pulsating voltage into a constant DC voltage and outputs it between its output terminal and the negative pole. After the dimming constant current circuit adds a voltage between its positive pole and negative pole, it detects the external 0-10V through the voltage sampling circuit. The voltage signal output by the dimmer, when the dimming constant current circuit detects that the voltage signal output by the external 0-10V dimmer is the voltage signal representing the light on through the voltage sampling circuit, the output terminal of the dimming constant current circuit outputs The magnitude of the current corresponds to the magnitude of the voltage signal output by the 0-10V dimmer, the larger the voltage signal output by the 0-10V dimmer, the stronger the luminous brightness of the LED light-emitting circuit, otherwise the voltage signal output by the 0-10V dimmer The smaller the value, the smaller the luminous brightness of the LED light-emitting circuit. When the dimming constant current circuit detects that the voltage signal output by the external 0-10V dimmer is the voltage signal for turning off the light through the voltage sampling circuit, the output terminal of the dimming constant current circuit outputs The current size of the LED is zero, and the LED light-emitting circuit does not emit light. Therefore, the utility model adopts a two-stage transformation method of a boost constant voltage circuit and a non-isolated dimming constant current circuit to realize low harmonics of the input current and low ripple of the output current. , so as to reduce light flicker when the LED light-emitting circuit emits light, and has high conversion efficiency.

Description of drawings

Fig. 1 is the functional block diagram of the 0-10V dimming non-isolated LED lamp circuit of the present invention;

Fig. 2 is the circuit diagram of the dimming constant current circuit and the voltage sampling circuit of the 0-10V dimming non-isolated LED lamp circuit of the present invention;

3 is a circuit diagram of a rectifier circuit and a boost constant voltage circuit of the 0-10V dimming non-isolated LED lamp circuit of the present invention.

Detailed ways

The utility model is described in further detail below in conjunction with the accompanying drawings.

Embodiment 1: As shown in Figure 1, a 0-10V dimming non-isolated LED lamp circuit has a live wire input terminal and a neutral wire input terminal for connecting to the mains voltage and a 0-10V The positive signal terminal and negative signal terminal of the voltage signal output by the dimmer, the 0-10V dimming non-isolated LED lamp circuit includes a dimming power supply circuit and an LED light-emitting circuit, the LED light-emitting circuit has a positive pole and a negative pole, and the light-emitting circuit of the LED light-emitting circuit The intensity is proportional to the magnitude of the current connected between the positive pole and the negative pole. The dimming power supply circuit includes a rectifier circuit, a boost constant voltage circuit, a dimming constant current circuit and a voltage sampling circuit. The rectifier circuit has a live line input terminal, a neutral line input terminal, The positive output terminal and the negative output terminal, the rectifier circuit is used to convert the AC voltage connected to the live wire input terminal and the neutral line input terminal into a pulsating DC voltage, the boost constant voltage circuit has an input terminal, an output terminal and a negative pole, and the boost constant voltage The voltage circuit is used to convert the pulsating DC voltage connected to its input terminal into a constant DC voltage output at its output terminal; the dimming constant current circuit adopts a non-isolated step-down transformation method, with positive pole, negative pole, output terminal, detection The positive pole of the detection terminal and the negative pole of the detection terminal, the dimming constant current circuit is used to set the output current of the output terminal according to the external dimming signal, the positive pole of the detection terminal and the negative pole of the detection terminal of the dimming constant current circuit are used to detect the dimming of the external access The output terminal of the dimming constant current circuit is used to output a constant current; the voltage sampling circuit has a positive input terminal, a negative input terminal, a positive output terminal and a negative output terminal. The positive pole of the current circuit is connected to the output terminal of the boost constant voltage circuit, the negative pole of the LED lighting circuit is connected to the output terminal of the dimming constant current circuit, the positive pole of the detection terminal of the dimming constant current circuit is connected to the positive output terminal of the voltage sampling circuit, The negative pole of the detection terminal of the dimming constant current circuit is connected to the negative output terminal of the voltage sampling circuit; The live wire input terminal of the 0-10V dimming non-isolated LED lamp circuit is connected, the neutral input terminal of the rectifier circuit is connected with the neutral input terminal of the 0-10V dimming non-isolated LED lamp circuit, and the positive input terminal of the voltage sampling circuit It is connected to the positive signal terminal of the 0-10V dimming non-isolated LED lamp circuit, and the negative input terminal of the voltage sampling circuit is connected to the negative signal terminal of the 0-10V dimming non-isolated LED lamp circuit. The boost constant voltage circuit also has an enable terminal, and the dimming constant current circuit also has a status signal terminal, the enable terminal of the boost constant voltage circuit is connected to the status signal terminal of the dimming constant current circuit, and the boost constant voltage circuit uses The energy terminal is used to access the voltage signal for entering the working state or the dormant state, and the state signal terminal of the dimming constant current circuit is used for outputting the voltage signal for entering the working state or the dormant state.

In this embodiment, the live and neutral input terminals of the 0-10V dimming non-isolated LED lighting circuit are connected to the live and neutral lines of the mains, and the positive and negative signal terminals are connected to the 0-10V dimmer At this time, the mains voltage is connected between the live line input terminal and the neutral line input terminal of the rectifier circuit, the positive input terminal and negative input terminal of the voltage sampling circuit are connected to the voltage signal output by the 0-10V dimmer, and the positive output terminal and negative input terminal of the rectifier circuit are connected The pulsating voltage is output between the output terminals. The boost constant voltage circuit converts the pulsating voltage into a constant DC voltage and outputs it between the output terminal and the negative pole. After the dimming constant current circuit adds voltage between the positive pole and the negative pole, Detect the voltage signal output by the external 0-10V dimmer through the voltage sampling circuit. When the dimming constant current circuit detects that the voltage signal output by the external 0-10V dimmer is the voltage signal representing the light on through the voltage sampling circuit, adjust The output current of the output terminal of the light constant current circuit corresponds to the voltage signal output by the 0-10V dimmer. The larger the voltage signal output by the 0-10V dimmer, the stronger the luminous brightness of the LED light-emitting circuit, otherwise 0 The smaller the voltage signal output by the -10V dimmer, the smaller the luminous brightness of the LED light-emitting circuit. When the dimming constant current circuit detects that the voltage signal output by the external 0-10V dimmer is the voltage signal for turning off the light through the voltage sampling circuit, The output current of the output terminal of the dimming constant current circuit is zero, and the LED light emitting circuit does not emit light. When the output current of the output terminal of the dimming constant current circuit is not zero, its state signal terminal outputs a voltage signal that enters the working state; when the output current of the output terminal of the dimming constant current circuit is zero, its status signal The terminal outputs the voltage signal to enter the dormant state. When the enable terminal of the boost constant voltage circuit is connected to the voltage signal to enter the working state, the boost constant voltage circuit is in the working state and performs normal work. When the boost constant voltage circuit is enabled When the voltage signal in the dormant state can be terminated, the boost constant voltage circuit is in a dormant state and stops working, and the power consumption of the boost constant voltage circuit is the lowest in the dormant state; It is in a non-working state, thereby further reducing the circuit power consumption of the 0-10V dimming non-isolated LED lamp circuit when it is not emitting light.

Embodiment 2: This embodiment is basically the same as Embodiment 1, the difference is that: as shown in Figure 2, in this embodiment, the dimming constant current circuit includes a first integrated circuit U1 of model SY5983, a first resistor R1, a second Second resistor R2, third resistor R3, fourth resistor R4, fifth resistor R5, sixth resistor R6, seventh resistor R7, eighth resistor R8, ninth resistor R9, tenth resistor R10, first diode D1 , second diode D2, third diode D3, fourth diode D4, first capacitor C1, second capacitor C2, third capacitor C3, fourth capacitor C4, fifth capacitor C5, first NMOS tube Q1 and the first inductor, the fifth capacitor C5 is an electrolytic capacitor, the first diode D1 is a Zener diode, the second diode D2, the third diode D3 and the fourth diode D4 are all rectifier diodes , the first inductance includes two coils, the two coils are respectively called the first coil L1-N1 and the second coil L1-N2, one end of the first resistor R1 is connected to one end of the second resistor R2, and the connecting end It is the state signal terminal of the dimming constant current circuit, the other end of the first resistor R1 is connected to the positive pole of the first diode D1, the negative pole of the first diode D1, the negative pole of the second diode D2, the third two The anode of the pole tube D3 is connected to one end of the first capacitor C1, the anode of the second diode D2 is connected to one end of the fifth resistor R5, the other end of the fifth resistor R5, one end of the third resistor R3 and the second coil L1 One end of -N2 is connected, the other end of the third resistor R3, one end of the fourth resistor R4 are connected to the second pin of the first integrated circuit U1, one end of the second capacitor C2, one end of the sixth resistor R6 are connected to the first integrated circuit The first pin of U1 is connected, the other end of the sixth resistor R6 is connected to one end of the third capacitor C3, one end of the fourth capacitor C4 is connected to the fifth pin of the first integrated circuit U1, and its connection end is dimming constant current The positive pole of the detection terminal of the circuit, the sixth pin of the first integrated circuit U1 is the negative pole of the detection terminal of the dimming constant current circuit, the negative pole of the third diode D3, one end of the seventh resistor R7 and the eighth pin of the first integrated circuit U1 Pin connection, the gate of the first NMOS transistor Q1 is connected to the fourth pin of the first integrated circuit U1, the source of the first NMOS transistor Q1, one end of the eighth resistor R8 and one end of the ninth resistor R9 are connected, and the eighth resistor The other end of R8 is connected to the third pin of the first integrated circuit U1, the drain of the first NMOS transistor Q1, the anode of the fourth diode D4 are connected to one end of the first coil L1-N1, and the first coil L1-N1 The other end of the fifth capacitor C5 is connected to one end of the tenth resistor R10, and the connected end is the output end of the dimming constant current circuit, the other end of the seventh resistor R7, the other end of the tenth resistor R10, the other end of the tenth resistor R10, The negative pole of the four diode D4 is connected to the positive pole of the fifth capacitor C5, and its connection end is the positive pole of the dimming constant current circuit, the other end of the second resistor R2, the other end of the fourth resistor R4, and the ninth resistor R9 The other end, the other end of the first capacitor C1, the other end of the second capacitor C2, the other end of the third capacitor C3, the other end of the fourth capacitor C4, the 7th pin of the first integrated circuit U1 and the second coil L1- The other end of N2 is connected, and its connection end is the negative pole of the dimming constant current circuit.

The dimming constant current circuit of this embodiment utilizes the DC voltage output by the output terminal of the step-up constant voltage circuit as a constant voltage, and transforms the first integrated circuit U1 of the model SY5983 from a conventional isolation conversion application to a step-down constant current conversion application, because no matter how the mains voltage fluctuates, the DC voltage output by the output terminal of the boost constant voltage circuit remains unchanged, so the current output by the output terminal of the dimming constant current circuit adjusted to step-down constant current conversion remains constant, So it has a better linear adjustment rate.

Embodiment 3: This embodiment is basically the same as Embodiment 2, the difference is that: as shown in Figure 2, in this embodiment, the voltage sampling circuit includes an eleventh resistor R11, a fifth diode D5, a sixth diode D6, the sixth capacitor C6, the seventh capacitor C7 and the high-frequency transformer T1, the sixth capacitor C6 is an electrolytic capacitor, the high-frequency transformer T1 includes a primary coil and a secondary coil, and one end of the eleventh resistor R11 is the positive voltage sampling circuit At the output end, the other end of the eleventh resistor R11 is connected to the anode of the fifth diode D5, the cathode of the fifth diode D5 is connected to one end of the primary coil of the high-frequency transformer T1, and the primary coil of the high-frequency transformer T1 The other end is the negative output end of the voltage sampling circuit, one end of the secondary coil of the high-frequency transformer T1 is connected to the anode of the sixth diode D6, the cathode of the sixth diode D6, the anode of the sixth capacitor C6 and the seventh capacitor One end of C7 is connected, and its connecting end is the positive input end of the voltage sampling circuit, the other end of the secondary coil of the high-frequency transformer T1, the negative pole of the sixth capacitor C6 and the other end of the seventh capacitor C7 are connected, and its connecting end It is the negative input terminal of the voltage sampling circuit.

Embodiment 4: This embodiment is basically the same as Embodiment 3, the difference is that, as shown in FIG. 3 , in this embodiment, the step-up constant voltage circuit includes a second integrated circuit U2 of model MT9750, a twelfth resistor R12, Thirteenth resistor R13, fourteenth resistor R14, fifteenth resistor R15, sixteenth resistor R16, seventeenth resistor R17, eighteenth resistor R18, nineteenth resistor R19, eighth capacitor C8, ninth capacitor C9, tenth capacitor C10, eleventh capacitor C11, twelfth capacitor C12, thirteenth capacitor C13, fourteenth capacitor C14, seventh diode D7, eighth diode D8, ninth diode D9, the second NMOS transistor Q2 and the second inductor, the seventh diode D7, the eighth diode D8 and the ninth diode D9 are all rectifier diodes, the fourteenth capacitor C14 is an electrolytic capacitor, and the second inductor has Two coils, the two coils are respectively called the third coil L2-N1 and the fourth coil L2-N2, one end of the eighth capacitor C8, one end of the thirteenth resistor R13 and one end of the third coil L2-N1 are connected , and its connection end is the positive pole of the boost constant voltage circuit, the other end of the thirteenth resistor R13, the negative pole of the ninth diode D9, one end of the tenth capacitor C10 are connected to the 8th pin of the second integrated circuit U2, One end of the nineteenth resistor R19 is connected to the fifth pin of the second integrated circuit U2, the positive pole of the ninth diode D9, the negative pole of the eighth diode D8 are connected to one end of the twelfth resistor R12, and the twelfth resistor The other end of R12 is connected to one end of the ninth capacitor C9, the other end of the ninth capacitor C9, the other end of the nineteenth resistor R19 are connected to one end of the fourth coil L2-N2, the second pin of the second integrated circuit U2, One end of the eleventh capacitor C11 is connected to one end of the fourteenth resistor R14, the other end of the fourteenth resistor R14 is connected to one end of the twelfth capacitor C12, the seventh pin of the second integrated circuit U2 and the second NMOS transistor Q2 Gate connection, the 4th pin of the second integrated circuit U2, the source of the second NMOS transistor Q2 and one end of the fifteenth resistor R15 are connected, and the 3rd pin of the second integrated circuit U2 is the enable of the boost constant voltage circuit end, the first pin of the second integrated circuit U2, one end of the thirteenth capacitor C13, one end of the seventeenth resistor R17 and one end of the eighteenth resistor R18 are connected, and the other end of the seventeenth resistor R17 is connected to the sixteenth resistor One end of R16 is connected, the other end of the sixteenth resistor R16, the negative pole of the seventh diode D7 and the positive pole of the fourteenth capacitor C14 are connected, and its connection end is the output end of the boost constant voltage circuit, and the seventh two poles The positive pole of the tube D7, the other end of the third coil L2-N1 and the drain of the second NMOS transistor Q2 are connected, the other end of the fifteenth resistor R15, the other end of the eighteenth resistor R18, and the other end of the eighth capacitor C8 , the other end of the tenth capacitor C10, the other end of the eleventh capacitor C11, the other end of the twelfth capacitor C12, the other end of the thirteenth capacitor C13, the cathode of the fourteenth capacitor C14, the eighth diode D8 The positive pole of the second integrated circuit U2 is connected to the other end of the fourth coil L2-N2, and the connection end is the negative pole of the boost constant voltage circuit.

In this embodiment, the rectifier circuit is implemented by a full-bridge rectifier bridge Db, the first pin of the full-bridge rectifier bridge Db is the neutral line input end of the rectifier circuit, and the third pin of the full-bridge rectifier bridge Db is the live wire input end of the rectifier circuit. The second pin of the full-bridge rectifier bridge Db is the positive output terminal of the rectifier circuit, and the fourth pin of the full-bridge rectifier bridge Db is the negative output terminal of the rectifier circuit.

In this embodiment, the second integrated circuit U2 of the type MT9570 in the step-up constant voltage circuit has an enable terminal, and by associating its enable terminal with the current output by the output terminal of the dimming constant current circuit, the When the output current of the output terminal of the light constant current circuit is not zero, it enters the working state, and when the output current of the output terminal of the dimming constant current circuit is zero, it enters the sleep state. Reduced to achieve low cost and energy saving.

In summary, the 0-10V dimming non-isolated LED lamp circuit of the present invention adopts a two-stage conversion method through a boosted constant voltage circuit and a dimming constant current circuit to achieve low harmonics in input current and low ripple in output current. Wave, reduce the light strobe of the LED light-emitting circuit when it is emitting light, and has a high conversion efficiency. At the same time, on the basis of not adding other control circuits, the current output of the dimming constant current circuit The state of whether or not is associated with the working state of the boost constant voltage circuit, so that the boost constant voltage circuit enters a dormant state when the LED light emitting circuit is not emitting light, thereby realizing low cost and low energy consumption.

Claims (5)

1. The 0-10V dimming non-isolated LED lamp circuit comprises a fire wire input end and a zero wire input end which are used for being connected with a mains voltage, and a positive signal end and a negative signal end which are used for being connected with a voltage signal output by a 0-10V dimmer, wherein the 0-10V dimming non-isolated LED lamp circuit comprises a dimming power supply circuit and an LED luminous circuit, the LED luminous circuit is provided with a positive electrode and a negative electrode, and is characterized in that the dimming power supply circuit comprises a rectifying circuit, a boosting constant voltage circuit, a dimming constant current circuit and a voltage sampling circuit, the rectifying circuit is provided with a fire wire input end, a zero wire input end, a positive output end and a negative output end, the boosting constant voltage circuit is provided with an input end, an output end and a negative electrode, the dimming constant current circuit adopts a non-isolated voltage reduction conversion mode and is provided with a positive electrode, a negative electrode, an output end, a detection end and a detection end negative electrode, the voltage sampling circuit is provided with a positive input end, a negative input end, a positive output end and a negative output end, the positive electrode of the LED light-emitting circuit, the positive electrode of the light-adjusting constant-current circuit and the output end of the voltage boosting constant-voltage circuit are connected, the negative electrode of the LED light-emitting circuit is connected with the output end of the light-adjusting constant-current circuit, the positive electrode of the detection end of the light-adjusting constant-current circuit is connected with the positive output end of the voltage sampling circuit, the negative electrode of the light-adjusting constant-current circuit is connected with the negative output end of the voltage sampling circuit, the negative electrode of the light-adjusting constant-current circuit, the negative electrode of the voltage boosting constant-current circuit is connected with the negative output end of the rectifying circuit, the live wire input end of the rectifying circuit is connected with the live wire input end of the 0-10V light-adjusting non-isolation LED lamp circuit, the zero line input end of the rectifying circuit is connected with the zero line input end of the 0-10V dimming non-isolated LED lamp circuit, the positive input end of the voltage sampling circuit is connected with the positive signal end of the 0-10V dimming non-isolated LED lamp circuit, and the negative input end of the voltage sampling circuit is connected with the negative signal end of the 0-10V dimming non-isolated LED lamp circuit.

2. The non-isolated LED lamp circuit with 0-10V dimming according to claim 1, wherein the voltage boosting constant-voltage circuit is further provided with an enabling end, the dimming constant-current circuit is further provided with a state signal end, the enabling end of the voltage boosting constant-voltage circuit is connected with the state signal end of the dimming constant-current circuit, the enabling end of the voltage boosting constant-voltage circuit is used for being connected with a voltage signal entering a working state or carrying out a dormant state, and the state signal end of the dimming constant-current circuit is used for outputting the voltage signal entering the working state or carrying out the dormant state.

3. The non-isolated LED lamp circuit with dimming of 0-10V according to claim 2, wherein the dimming constant current circuit comprises a first integrated circuit, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first diode, a second diode, a third diode, a fourth diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first NMOS diode, a first inductor, the fifth capacitor is an electrolytic capacitor, the first diode is a zener diode, the second diode, the third diode and the fourth diode are rectifier diodes, the first inductor comprises two coils respectively called a first coil and a second coil, one end of the first resistor is connected to one end of the second resistor, one end of the first resistor is connected to a positive terminal of the first diode, the other end of the first resistor is connected to a second terminal of the first diode, the second resistor, the other end of the first diode is connected to the other end of the fourth resistor, the first diode is connected to the first resistor, the first resistor is connected to the other end of the first resistor is connected to the first resistor, the other end of the sixth resistor is connected with one end of the third capacitor, one end of the fourth capacitor is connected with the 5 th pin of the first integrated circuit, the connecting end of the fourth capacitor is the positive electrode of the detecting end of the dimming constant current circuit, the 6 th pin of the first integrated circuit is the negative electrode of the detecting end of the dimming constant current circuit, the negative electrode of the third diode, one end of the seventh resistor is connected with the 8 th pin of the first integrated circuit, the grid electrode of the first NMOS tube is connected with the 4 th pin of the first integrated circuit, the source electrode of the first NMOS tube, one end of the eighth resistor is connected with one end of the ninth resistor, the other end of the eighth resistor is connected with the 3 rd pin of the first integrated circuit, the drain electrode of the first NMOS tube, the positive electrode of the fourth diode is connected with one end of the first coil, the other end of the first coil, the negative electrode of the fifth capacitor and one end of the tenth resistor are connected, the connecting end of the fifth resistor is the output end of the dimming constant current circuit, the other end of the seventh resistor, the other end of the tenth resistor, the negative electrode of the fourth diode and the positive electrode of the fifth capacitor are connected, the connecting end of the fourth resistor is the positive electrode of the dimming constant current circuit, the other end of the second resistor, the other end of the fourth resistor, the other end of the ninth resistor, the other end of the first capacitor, the other end of the second capacitor, the other end of the third capacitor, the other end of the fourth capacitor, the 7 th pin of the first integrated circuit and the other end of the second coil are connected, and the connecting end is the negative electrode of the dimming constant current circuit.

4. The non-isolated LED lamp circuit with dimming of 0-10V according to claim 3, wherein the voltage sampling circuit comprises an eleventh resistor, a fifth diode, a sixth capacitor, a seventh capacitor and a high-frequency transformer, the sixth capacitor is an electrolytic capacitor, the high-frequency transformer comprises a primary coil and a secondary coil, one end of the eleventh resistor is a positive output end of the voltage sampling circuit, the other end of the eleventh resistor is connected with an anode of the fifth diode, a cathode of the fifth diode is connected with one end of the primary coil of the high-frequency transformer, the other end of the primary coil of the high-frequency transformer is a negative output end of the voltage sampling circuit, one end of the secondary coil of the high-frequency transformer is connected with an anode of the sixth diode, the cathode of the sixth capacitor is connected with one end of the seventh capacitor, and the other end of the negative end of the high-frequency transformer is connected with the negative input end of the voltage sampling circuit.

5. The non-isolated LED lamp circuit of claim 4, wherein the boost constant voltage circuit comprises a second integrated circuit having a model MT9750, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a seventh diode, an eighth diode, a ninth diode, a second NMOS tube, and a second inductor, wherein the seventh diode, the eighth diode, and the ninth diode are rectifier diodes, the fourteenth capacitor is an electrolytic capacitor, the second inductor has two coils, which are respectively referred to as a third coil and a fourth coil, one end of the eighth capacitor, one end of the thirteenth resistor and one end of the third coil are connected, the connection end of the thirteenth resistor, the negative electrode of the ninth diode, one end of the tenth capacitor and the 8 th pin of the second integrated circuit are connected, one end of the nineteenth resistor is connected with the 5 th pin of the second integrated circuit, the positive electrode of the ninth diode, the negative electrode of the eighth diode and one end of the twelfth resistor are connected, the other end of the twelfth resistor is connected with one end of the ninth capacitor, the other end of the nineteenth resistor and one end of the fourth coil are connected, the 2 nd pin of the second integrated circuit, one end of the eleventh capacitor is connected with one end of the fourteenth resistor, the other end of the thirteenth resistor is connected with one end of the twelfth capacitor, the 7 th pin of the second integrated circuit is connected with the grid electrode of the second NMOS tube, the 4 th pin of the second integrated circuit, the source electrode of the second NMOS tube and one end of the fifteenth resistor are connected, the 3 rd pin of the second integrated circuit is the enabling end of the voltage boosting constant circuit, the 1 st pin of the second integrated circuit, one end of the thirteenth resistor, one end of the seventeenth resistor and one end of the eighteenth resistor are connected, the negative electrode of the seventh diode is connected with the positive electrode of the fourteenth capacitor, the connection end of the voltage boosting circuit is the output end of the voltage boosting constant circuit, the positive electrode of the seventh diode, the positive electrode of the third coil of the NMOS tube is connected with the negative electrode of the eighth resistor, the other end of the eighth resistor is connected with the other end of the eighth resistor, the other end of the eighth resistor is connected with the drain electrode of the eighth resistor, the other end of the eighth resistor is connected with the eighth resistor.