Intelligent LED lamp circuit compatible with phase-cut dimmer

Abstract

The intelligent LED lamp circuit comprises a rectification circuit, an intelligent module, a constant current dimming circuit, an LED light emitting circuit and a voltage stabilizing circuit, a coil which forms a transformer with an internal switch conversion inductor is added in the constant current dimming circuit, and an original coil of the switch conversion inductor is used as a primary coil of the transformer. The coil serves as a secondary coil of the transformer to generate alternating voltage, and the voltage stabilizing circuit converts the alternating voltage generated by the secondary coil into working voltage needed by the intelligent module to supply power to the intelligent module. The auxiliary power supply has the advantages that the coil and the voltage stabilizing circuit are used for replacing an existing independently-arranged auxiliary power supply adopting an AC-DC switch conversion mode, the cost is reduced, the circuit structure is simplified, the occupied PCB area is reduced, and the small space design difficulty can be reduced.

Description

Technical Field

[0001] The utility model relates to an intelligent LED lamp circuit, in particular to an intelligent LED lamp circuit compatible with a phase-cutting dimmer. Background Art

[0002] The smart LED lamp compatible with the phase-cut dimmer can not only communicate wirelessly with the external controller and dim under the control of the wireless signal (i.e., dimming signal) sent by the external controller, but also can be installed in the existing widely existing tangential dimmer circuit and dim using the traditional tangential dimmer, which has the advantage of dual dimming functions. When the smart LED lamp compatible with the phase-cut dimmer is installed in the traditional tangential dimmer circuit, when the conduction angle of the phase-cut dimmer is the maximum, the external controller can be used to adjust the luminous brightness of the smart LED lamp; when the external controller adjusts the luminous brightness of the smart LED lamp to the highest brightness, the traditional phase-cut dimmer can be used to adjust the brightness of the smart LED lamp normally.

[0003] The existing intelligent LED lamp compatible with tangential dimmers usually includes a rectifier circuit, an intelligent module, a constant current dimming circuit and an LED light-emitting circuit. The rectifier circuit is used to convert AC voltage into DC voltage and output it to the constant current dimming circuit. The intelligent module is used to receive the dimming signal output by the external controller, and convert the received dimming signal into a corresponding control signal and output it to the constant current dimming circuit. The constant current dimming circuit is used to generate a corresponding current according to the control signal and DC voltage received by it and output it to the LED light-emitting circuit, and the LED light-emitting circuit emits light of corresponding brightness. However, the existing intelligent LED lamp compatible with tangential dimmers also needs to be set as an auxiliary power supply to provide the working voltage for the intelligent module. This auxiliary power supply usually adopts an AC-DC switch conversion method. If the constant current dimming circuit in the existing intelligent LED lamp compatible with tangential dimmers also adopts a switch conversion method, then the intelligent LED lamp compatible with tangential dimmers will have two AC-DC switch circuits, which will not only have a relatively high cost, but also have a relatively complex circuit structure and will occupy a large PCB area. This is not only not conducive to reducing costs, but also increases the difficulty of design in a small space. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide an intelligent LED lamp circuit which is low in cost, simple in circuit structure, occupies a small PCB area and is compatible with a phase-cutting dimmer and can reduce the difficulty of small space design.

[0005] The technical solution adopted by the utility model to solve the above technical problems is: an intelligent LED lamp circuit compatible with a phase-cutting dimmer, comprising a rectifier circuit, an intelligent module, a constant current dimming circuit and an LED light-emitting circuit, wherein the rectifier circuit is used to convert an AC voltage into a DC voltage and output it to the constant current dimming circuit, the intelligent module is used to receive a dimming signal output by an external controller, and convert the received dimming signal into a corresponding control signal and output it to the constant current dimming circuit, the constant current dimming circuit is used to control the LED light-emitting circuit to emit corresponding light according to the control signal received and the connected DC voltage, the constant current dimming circuit is a constant current dimming circuit using a switch conversion method, which has a switch conversion inductor, the intelligent LED lamp circuit also includes a voltage stabilizing circuit, the constant current dimming circuit also has a coil that forms a transformer with the switch conversion inductor, the original coil of the switch conversion inductor serves as the primary coil of the transformer, the coil serves as the secondary coil of the transformer to generate an AC voltage, and the voltage stabilizing circuit is used to convert the AC voltage generated by the secondary coil into the working voltage required by the intelligent module to power the intelligent module.

[0006] The constant current dimming circuit includes a boost conversion circuit and a linear constant current circuit. The boost conversion circuit is a switching conversion circuit with constant voltage output and has a current limiting output function. The boost conversion circuit has the switching conversion inductor and the coil. The switching conversion inductor is called a boost inductor in the boost conversion circuit. The boost conversion circuit is used to boost the DC voltage output by the rectifier circuit through the boost inductor to obtain a boosted DC voltage output to the LED light-emitting circuit, and generate an AC voltage through the coil to output to the voltage stabilizing circuit. The linear constant current circuit is used to receive the control signal output by the intelligent module and generate a corresponding current output to the LED light-emitting circuit.

[0007] The rectifier circuit has a first input terminal, a second output terminal, a positive output terminal and a negative output terminal, the boost converter circuit has an input terminal, an output terminal, a negative electrode and a voltage output terminal, the LED light-emitting circuit has a positive electrode and a negative electrode, the voltage stabilizing circuit has an input terminal, an output terminal and a negative electrode, the intelligent module has a positive electrode, a negative electrode and an output terminal, the linear constant current circuit has a positive electrode, a negative electrode, an output terminal and a regulating terminal, the first input terminal and the second input terminal of the rectifier circuit are used to connect to an AC voltage, the positive output terminal and the negative output terminal of the rectifier circuit are used to output a DC voltage, the positive output terminal of the rectifier circuit is connected to the input terminal of the boost converter circuit, The output end of the boost conversion circuit is connected to the positive electrode of the LED light-emitting circuit, the voltage output end of the boost conversion circuit is connected to the input end of the voltage stabilizing circuit, the output end of the voltage stabilizing circuit is connected to the positive electrode of the intelligent module, the output end of the intelligent module is connected to the regulating end of the linear constant current circuit, the output end of the linear constant current circuit is connected to the negative electrode of the LED light-emitting circuit, the positive electrode of the linear constant current circuit is used to access its working voltage, and the negative output end of the rectifier circuit, the negative electrode of the boost conversion circuit, the negative electrode of the voltage stabilizing circuit, the negative electrode of the intelligent module and the negative electrode of the linear constant current circuit are all grounded.

[0008] The boost conversion circuit also includes a first capacitor, a second capacitor, a first resistor, a first diode and a first MOS tube. The first diode is a rectifier diode, the second capacitor is an electrolytic capacitor, one end of the boost inductor is connected to one end of the first capacitor, and the connection end is the input end of the boost conversion circuit, the other end of the boost inductor, the drain of the first MOS tube and the anode of the first diode are connected, the cathode of the first diode is connected to the positive electrode of the second capacitor, and the connection end is the output end of the boost conversion circuit, the source of the first MOS tube is connected to one end of the first resistor, the other end of the first capacitor, the other end of the first resistor, one end of the coil and the negative electrode of the second capacitor are connected, and the connection end is the negative electrode of the boost conversion circuit, and the other end of the coil is the voltage output end of the boost conversion circuit.

[0009] The linear constant current circuit includes a first linear constant current unit, a second linear constant current unit, a second resistor and a third resistor. The first linear constant current unit has a positive electrode, a PWM adjustment end, a current setting end, an output end and a negative electrode. The second linear constant current unit has a current setting end, an output end and a negative electrode. The positive electrode of the first linear constant current unit is the positive electrode of the linear constant current circuit. One end of the third resistor is connected to the current setting end of the first linear constant current unit, one end of the second resistor is connected to the current setting end of the second linear constant current unit, the output end of the first linear constant current unit is connected to the output end of the second linear constant current unit, and the connection end is the output end of the linear constant current circuit. The other end of the third resistor, the other end of the second resistor, the negative electrode of the first linear constant current unit and the negative electrode of the second linear constant current unit are connected, and the connection end is the negative electrode of the linear constant current circuit. The PWM adjustment end of the first linear constant current unit is the adjustment end of the linear constant current circuit.

[0010] The voltage stabilizing circuit includes a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a second diode, a third diode, a first transistor and a first integrated circuit, wherein the seventh capacitor is an electrolytic capacitor, the second diode is a rectifier diode, the third diode is a voltage stabilizing diode, the first integrated circuit is a three-terminal voltage stabilizing circuit having an input terminal, an output terminal and an adjustment terminal, one end of the sixth capacitor is the input terminal of the voltage stabilizing circuit, the other end of the sixth capacitor is connected to one end of the seventh resistor, the other end of the seventh resistor, the negative electrode of the second diode and the positive electrode of the third diode are connected, and the positive electrode of the second diode, one end of the fourth resistor and the base of the first transistor are connected , the cathode of the third diode, the anode of the seventh capacitor, and one end of the third capacitor are connected to the input end of the first integrated circuit, the output end of the first integrated circuit, one end of the fourth capacitor and one end of the fifth resistor are connected, and the connection end is the output end of the voltage stabilizing circuit, the other end of the fifth resistor and one end of the sixth resistor are connected to the collector of the first transistor, the other end of the sixth resistor is connected to one end of the fifth capacitor, the other end of the fourth resistor, the cathode of the seventh capacitor, the other end of the third capacitor, the other end of the fourth capacitor, the other end of the fifth capacitor, the emitter of the first transistor and the adjustment end of the first integrated circuit are connected, and the connection end is the cathode of the voltage stabilizing circuit.

[0011] The constant current dimming circuit adopting the switch conversion mode also includes an RC absorption circuit, the RC absorption circuit has a positive electrode and a negative electrode, the positive electrode of the RC absorption circuit is connected to the positive output end of the rectifier circuit, and the negative electrode of the RC absorption circuit is connected to the negative output end of the rectifier circuit. The RC absorption circuit can make the intelligent LED lamp circuit of the utility model more compatible with the normal operation of the phase-cutting dimmer.

[0012] Compared with the prior art, the advantage of the utility model lies in that a voltage stabilizing circuit is provided, and a coil of a transformer is added to the constant current dimming circuit together with the internal switch conversion inductor. The original coil of the switch conversion inductor serves as the primary coil of the transformer, and the coil serves as the secondary coil of the transformer to generate an AC voltage. The voltage stabilizing circuit converts the AC voltage generated by the secondary coil into the working voltage required by the intelligent module to power the intelligent module. Therefore, the utility model replaces the existing independently set auxiliary power supply using AC-DC switch conversion method with a coil and a voltage stabilizing circuit, thereby reducing costs, simplifying circuit structure, reducing occupied PCB area, and reducing the difficulty of small space design. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a structural block diagram of the intelligent LED lamp circuit compatible with the phase-cutting dimmer of the utility model;

[0014] Figure 2 A circuit diagram of a boost conversion circuit of an intelligent LED lamp circuit compatible with a phase-cutting dimmer of the utility model;

[0015] Figure 3 A circuit diagram of a linear constant current circuit of an intelligent LED lamp circuit compatible with a phase-cutting dimmer of the utility model;

[0016] Figure 4 The utility model is a circuit diagram of a voltage stabilizing circuit of an intelligent LED lamp circuit compatible with a phase-cutting dimmer. DETAILED DESCRIPTION

[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0018] Embodiment 1: Figure 1As shown, an intelligent LED lamp circuit compatible with a phase-cutting dimmer includes a rectifier circuit, an intelligent module, a constant current dimming circuit and an LED light-emitting circuit. The rectifier circuit is used to convert an AC voltage into a DC voltage and output it to the constant current dimming circuit. The intelligent module is used to receive a dimming signal output by an external controller, and convert the received dimming signal into a corresponding control signal and output it to the constant current dimming circuit. The constant current dimming circuit is used to control the LED light-emitting circuit to emit corresponding light according to the control signal received and the connected DC voltage. The constant current dimming circuit is a constant current dimming circuit using a switch conversion method, which has a switch conversion inductor L. The intelligent LED lamp circuit also includes a voltage stabilizing circuit. The constant current dimming circuit also has a coil that forms a transformer with the switch conversion inductor L. The original coil of the switch conversion inductor L serves as the primary coil Np of the transformer, and the coil serves as the secondary coil Na of the transformer to generate an AC voltage. The voltage stabilizing circuit is used to convert the AC voltage generated by the secondary coil Na into the working voltage required by the intelligent module to power the intelligent module.

[0019] In this embodiment, the constant current dimming circuit includes a boost conversion circuit and a linear constant current circuit. The boost conversion circuit is a switching conversion circuit with constant voltage output and has a current limiting output function. The boost conversion circuit has a switching conversion inductor L and a coil. The switching conversion inductor L is called a boost inductor L in the boost conversion circuit. The boost conversion circuit is used to boost the DC voltage output by the rectifier circuit through the boost inductor L to obtain a boosted DC voltage output to the LED light-emitting circuit, and generate an AC voltage through the coil to output to the voltage stabilizing circuit. The linear constant current circuit is used to receive the control signal output by the intelligent module and generate a corresponding current output to the LED light-emitting circuit.

[0020] In this embodiment, the rectifier circuit has a first input terminal, a second output terminal, a positive output terminal and a negative output terminal, the boost conversion circuit has an input terminal, an output terminal, a negative electrode and a voltage output terminal, the LED light-emitting circuit has a positive electrode and a negative electrode, the voltage stabilizing circuit has an input terminal, an output terminal and a negative electrode, the intelligent module has a positive electrode, a negative electrode and an output terminal, the linear constant current circuit has a positive electrode, a negative electrode, an output terminal and a regulating terminal, the first input terminal and the second input terminal of the rectifier circuit are used to connect to an AC voltage, the positive output terminal and the negative output terminal of the rectifier circuit are used to output a DC voltage, the positive output terminal of the rectifier circuit is connected to the boost The input end of the voltage conversion circuit is connected, the output end of the voltage boost conversion circuit is connected to the positive electrode of the LED light-emitting circuit, the voltage output end of the voltage boost conversion circuit is connected to the input end of the voltage stabilizing circuit, the output end of the voltage stabilizing circuit is connected to the positive electrode of the intelligent module, the output end of the intelligent module is connected to the regulating end of the linear constant current circuit, the output end of the linear constant current circuit is connected to the negative electrode of the LED light-emitting circuit, the positive electrode of the linear constant current circuit is used to access its working voltage, and the negative output end of the rectifier circuit, the negative electrode of the voltage boost conversion circuit, the negative electrode of the voltage stabilizing circuit, the negative electrode of the intelligent module and the negative electrode of the linear constant current circuit are all grounded.

[0021] In this embodiment, the smart LED lamp circuit compatible with the phase-cutting dimmer also includes an RC absorption circuit, which has a positive pole and a negative pole. The positive pole of the RC absorption circuit is connected to the positive output end of the rectifier circuit, and the negative pole of the RC absorption circuit is connected to the negative output end of the rectifier circuit.

[0022] In this embodiment, the boost conversion circuit can convert the DC voltage connected between its input terminal and the negative electrode into a higher DC voltage and output it between its output terminal and the negative electrode. The output terminal and the negative electrode of the boost conversion circuit have a maximum output current, and the magnitude of this maximum output current corresponds to the average voltage connected between its input terminal and the negative electrode. When the actual current output between the output terminal and the negative electrode of the boost conversion circuit is less than its maximum output current, the voltage between its output terminal and the negative electrode is the voltage value of the constant voltage output. When the actual current output between the output terminal and the negative electrode of the boost conversion circuit is equal to its maximum output current, the magnitude of the actual current output between its output terminal and the negative electrode can be adjusted by the conduction angle of the phase dimmer to change the average voltage between its input terminal and the negative electrode, thereby changing the magnitude of the current output between its output terminal and the negative electrode. The maximum current value output from the output terminal of the linear constant current circuit corresponds to the control signal connected to its adjustment terminal, that is, the maximum conduction current between its output terminal and the negative electrode is its maximum current value. The intelligent module communicates with the external control device through a radio signal, and converts the received radio dimming signal into a corresponding control signal and outputs it at its output terminal. The larger the current connected between the positive and negative poles of the LED light-emitting circuit, the stronger its luminous intensity; the smaller the current connected between the positive and negative poles of the LED light-emitting circuit, the weaker its luminous intensity. The voltage stabilizing circuit converts the voltage connected between its input terminal and the negative pole into a DC voltage, and outputs the voltage required for the operation of the intelligent module between its output terminal and the negative pole. When the first input terminal and the second output terminal of the rectifier circuit are connected to an AC voltage, its positive output terminal and the negative output terminal output a DC voltage, and the boost converter circuit works, outputting a DC voltage between its output terminal and the negative pole while its voltage output terminal outputs an AC voltage. The voltage stabilizing circuit rectifies and converts the AC voltage output from the voltage output terminal of the boost converter circuit, and outputs a DC voltage to provide the working voltage for the intelligent module. At this time, the output terminal of the intelligent module outputs a corresponding control signal, sets the maximum current value of the output terminal of the linear constant current circuit, and when the DC voltage output from the output terminal of the boost converter circuit is greater than or equal to the working voltage of the LED light-emitting circuit, the LED light-emitting circuit emits light.

[0023] In this embodiment, under normal circumstances, when the intelligent LED lamp circuit compatible with the phase-cut dimmer is connected to the complete mains voltage, the maximum output current of the boost conversion circuit is slightly greater than the maximum current value that the intelligent module can set for the linear constant current circuit, and the operating voltage of the LED light-emitting circuit is slightly lower than the voltage value of the constant voltage output preset by the boost conversion circuit. When the intelligent module adjusts the luminous intensity of the LED light-emitting circuit to the strongest through the linear constant current circuit, the DC voltage output from the output end of the boost constant voltage circuit remains at the voltage value of the constant voltage output, and the current output from the output end of the linear constant current circuit is the maximum current value set by the intelligent module. When the intelligent LED lamp circuit compatible with the phase-cut dimmer is connected to the existing tangential dimmer circuit, when the dimming angle of the phase-cut dimmer is the largest, the AC voltage connected to the first input end and the second input end of the rectifier circuit is close to the complete mains voltage, and the current that can be output between the output end and the negative pole of the boost conversion circuit is the maximum output current. When the control signal output by the intelligent module adjusts the brightness of the LED light-emitting circuit, the current actually output between the output end and the negative electrode of the boost converter circuit is less than the maximum output current it can output, and the voltage output between its output end and the negative electrode is the voltage value of the constant voltage output. The control signal output by the output end of the intelligent module corresponds to the maximum current value of the output end of the linear constant current circuit, so that the brightness of the LED light circuit can be adjusted. When the control signal output by the intelligent module is a control signal set to the highest brightness, when the conduction angle of the phase-cut dimmer decreases, the maximum current value that can be output between the output end and the negative electrode of the boost converter circuit decreases accordingly. When the maximum output current output between the output end and the negative electrode of the boost converter circuit is less than or equal to the maximum current value set by the linear constant current circuit, the current actually flowing through the LED light-emitting circuit is the maximum current output between the output end and the negative electrode of the boost constant voltage circuit, and the magnitude of this current corresponds to the conduction angle of the phase-cut dimmer. Therefore, within the range where the maximum output current between the output end and the negative pole of the boost converter circuit is adjusted by the phase dimmer to be less than or equal to the maximum current value of the linear constant current circuit, the current flowing through the LED light-emitting circuit corresponds to the conduction angle of the phase dimmer, and the brightness of the LED light-emitting circuit can be changed by changing the conduction angle of the phase dimmer. Therefore, the intelligent LED lamp circuit of the utility model can conveniently utilize the technology of controlling the light emission of the LED light-emitting circuit through the linear constant current circuit using the existing intelligent module, and by increasing the number of LED light-emitting circuits and the number of output ends of the linear constant current circuit, it is easy to expand from a single brightness adjustment function to a function that can adjust both the brightness and the color temperature or color.

[0024] Embodiment 2: This embodiment is basically the same as Embodiment 1, except that: Figure 2As shown, in this embodiment, the boost conversion circuit further includes a first capacitor C1, a second capacitor C2, a first resistor R1, a first diode D1 and a first MOS tube M1, the first diode D1 is a rectifier diode, the second capacitor C2 is an electrolytic capacitor, one end of the boost inductor is connected to one end of the first capacitor C1, and the connection end thereof is the input end of the boost conversion circuit, the other end of the boost inductor and the drain of the first MOS tube M1 are connected to the anode of the first diode D1, the cathode of the first diode D1 is connected to the positive electrode of the second capacitor C2, and the connection end thereof is the output end of the boost conversion circuit, the source of the first MOS tube M1 is connected to one end of the first resistor R1, the other end of the first capacitor C1, the other end of the first resistor R1, one end of the coil is connected to the negative electrode of the second capacitor C2, and the connection end thereof is the negative electrode of the boost conversion circuit, and the other end of the coil is the voltage output end of the boost conversion circuit.

[0025] Embodiment 3: This embodiment is basically the same as Embodiment 1, except that: Figure 3 As shown, in this embodiment, the linear constant current circuit includes a first linear constant current unit U1, a second linear constant current unit U2, a second resistor R2 and a third resistor R3. The first linear constant current unit U1 and the second linear constant current unit U2 are both implemented using mature technologies in the art. The first linear constant current unit U1 has a positive electrode, a PWM adjustment end, a current setting end, an output end and a negative electrode. The second linear constant current unit U2 has a current setting end, an output end and a negative electrode. The positive electrode of the first linear constant current unit U1 is the positive electrode of the linear constant current circuit. One end of the third resistor R3 and the first linear constant current The current setting end of the unit U1 is connected, one end of the second resistor R2 is connected to the current setting end of the second linear constant current unit U2, the output end of the first linear constant current unit U1 is connected to the output end of the second linear constant current unit U2, and the connection end is the output end of the linear constant current circuit, the other end of the third resistor R3, the other end of the second resistor R2, the cathode of the first linear constant current unit U1 and the cathode of the second linear constant current unit U2 are connected, and the connection end is the cathode of the linear constant current circuit, and the PWM adjustment end of the first linear constant current unit U1 is the adjustment end of the linear constant current circuit.

[0026] In this embodiment, when the control signal connected to the regulating end of the linear constant current circuit is 0, the output end and the cathode remain in a conductive state. This is because even if the output end and the cathode of the first linear constant current unit U1 are cut off, the maximum conduction current of the output end of the second linear constant current unit U2 is set by the resistance value of the second resistor R2, and the output end and the cathode remain conductive.

[0027] Embodiment 3: This embodiment is basically the same as Embodiment 1, except that: Figure 4As shown, in this embodiment, the voltage stabilizing circuit includes a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a second diode D2, a third diode D3, a first transistor Q1 and a first integrated circuit U3, the seventh capacitor C7 is an electrolytic capacitor, the second diode D2 is a rectifier diode, the third diode D3 is a voltage stabilizing diode, the first integrated circuit U3 is a three-terminal voltage stabilizing circuit, having an input end, an output end and an adjustment end, one end of the sixth capacitor C6 is the input end of the voltage stabilizing circuit, the other end of the sixth capacitor C6 is connected to one end of the seventh resistor R7, the other end of the seventh resistor R7, the cathode of the second diode D2 and the anode of the third diode D3 are connected, the anode of the second diode D2, one end of the fourth resistor R4 and the first transistor The base of Q1 is connected, the cathode of the third diode D3, the anode of the seventh capacitor C7, one end of the third capacitor C3 and the input end of the first integrated circuit U3 are connected, the output end of the first integrated circuit U3, one end of the fourth capacitor C4 and one end of the fifth resistor R5 are connected, and the connection end is the output end of the voltage stabilizing circuit, the other end of the fifth resistor R5 and one end of the sixth resistor R6 are connected to the collector of the first triode Q1, the other end of the sixth resistor R6 is connected to one end of the fifth capacitor C5, this connection end can provide a voltage signal whether the output voltage of the voltage stabilizing circuit remains stable, the other end of the fourth resistor R4, the cathode of the seventh capacitor C7, the other end of the third capacitor C3, the other end of the fourth capacitor C4, the other end of the fifth capacitor C5, the emitter of the first triode Q1 and the adjustment end of the first integrated circuit U3 are connected, and the connection end is the cathode of the voltage stabilizing circuit.

[0028] In this embodiment, the voltage stabilizing circuit can further set a port (i.e., the connection end of the other end of the sixth resistor R6 and one end of the fifth capacitor C5) to provide a voltage signal to indicate whether the output voltage of the voltage stabilizing circuit remains stable. The external communication module determines whether the voltage across the seventh capacitor C7 decreases by detecting whether current flows through the third diode D3 at the port, thereby determining whether the voltage stabilizing circuit can continue to provide sufficient output current to maintain a stable output voltage. When the external communication module determines that the power supply capacity of the voltage stabilizing circuit is reduced to a preset threshold value through the voltage signal of this port, the power consumption of the circuit for wireless communication in the intelligent module is reduced or turned off. When the intelligent LED lamp circuit is in a small conduction angle position and emits low brightness when the phase dimmer is in the tangential dimmer, the light jitter that may occur due to the fluctuation of the power consumption of the intelligent module can be avoided, thereby improving the light emission stability when the phase dimmer dims the intelligent LED lamp circuit to a low brightness.

Claims

1. An intelligent LED lamp circuit compatible with a phase-cutting dimmer, comprising a rectifier circuit, an intelligent module, a constant current dimming circuit and an LED light-emitting circuit, wherein the rectifier circuit is used to convert an AC voltage into a DC voltage and output it to the constant current dimming circuit, the intelligent module is used to receive a dimming signal output by an external controller, and convert the received dimming signal into a corresponding control signal and output it to the constant current dimming circuit, the constant current dimming circuit is used to control the LED light-emitting circuit to emit corresponding light according to the received control signal and the connected DC voltage, the constant current dimming circuit is a constant current dimming circuit using a switch conversion method, and has a switch conversion inductor, characterized in that The intelligent LED lamp circuit also includes a voltage stabilizing circuit, and the constant current dimming circuit also has a coil that forms a transformer with its switch conversion inductor. The original coil of the switch conversion inductor serves as the primary coil of the transformer, and the coil serves as the secondary coil of the transformer to generate an AC voltage. The voltage stabilizing circuit is used to convert the AC voltage generated by the secondary coil into the working voltage required by the intelligent module to power the intelligent module.

2. The intelligent LED lamp circuit compatible with a phase-cutting dimmer according to claim 1, characterized in that The constant current dimming circuit includes a boost conversion circuit and a linear constant current circuit. The boost conversion circuit is a switching conversion circuit with constant voltage output and has a current limiting output function. The boost conversion circuit has the switching conversion inductor and the coil. The switching conversion inductor is called a boost inductor in the boost conversion circuit. The boost conversion circuit is used to boost the DC voltage output by the rectifier circuit through the boost inductor to obtain a boosted DC voltage output to the LED light-emitting circuit, and generate an AC voltage through the coil to output to the voltage stabilizing circuit. The linear constant current circuit is used to receive the control signal output by the intelligent module and generate a corresponding current output to the LED light-emitting circuit.

3. The intelligent LED lamp circuit compatible with a phase-cutting dimmer according to claim 2, characterized in that The rectifier circuit has a first input terminal, a second output terminal, a positive output terminal and a negative output terminal, the boost converter circuit has an input terminal, an output terminal, a negative electrode and a voltage output terminal, the LED light-emitting circuit has a positive electrode and a negative electrode, the voltage stabilizing circuit has an input terminal, an output terminal and a negative electrode, the intelligent module has a positive electrode, a negative electrode and an output terminal, the linear constant current circuit has a positive electrode, a negative electrode, an output terminal and a regulating terminal, the first input terminal and the second input terminal of the rectifier circuit are used to connect to an AC voltage, the positive output terminal and the negative output terminal of the rectifier circuit are used to output a DC voltage, the positive output terminal of the rectifier circuit is connected to the input terminal of the boost converter circuit, The output end of the boost conversion circuit is connected to the positive electrode of the LED light-emitting circuit, the voltage output end of the boost conversion circuit is connected to the input end of the voltage stabilizing circuit, the output end of the voltage stabilizing circuit is connected to the positive electrode of the intelligent module, the output end of the intelligent module is connected to the regulating end of the linear constant current circuit, the output end of the linear constant current circuit is connected to the negative electrode of the LED light-emitting circuit, the positive electrode of the linear constant current circuit is used to access its working voltage, and the negative output end of the rectifier circuit, the negative electrode of the boost conversion circuit, the negative electrode of the voltage stabilizing circuit, the negative electrode of the intelligent module and the negative electrode of the linear constant current circuit are all grounded.

4. The intelligent LED lamp circuit compatible with a phase-cutting dimmer according to claim 3, characterized in that The boost conversion circuit also includes a first capacitor, a second capacitor, a first resistor, a first diode and a first MOS tube. The first diode is a rectifier diode, the second capacitor is an electrolytic capacitor, one end of the boost inductor is connected to one end of the first capacitor, and the connection end is the input end of the boost conversion circuit, the other end of the boost inductor, the drain of the first MOS tube and the anode of the first diode are connected, the cathode of the first diode is connected to the positive electrode of the second capacitor, and the connection end is the output end of the boost conversion circuit, the source of the first MOS tube is connected to one end of the first resistor, the other end of the first capacitor, the other end of the first resistor, one end of the coil and the negative electrode of the second capacitor are connected, and the connection end is the negative electrode of the boost conversion circuit, and the other end of the coil is the voltage output end of the boost conversion circuit.

5. The intelligent LED lamp circuit compatible with a phase-cutting dimmer according to claim 3, characterized in that The linear constant current circuit includes a first linear constant current unit, a second linear constant current unit, a second resistor and a third resistor. The first linear constant current unit has a positive electrode, a PWM adjustment end, a current setting end, an output end and a negative electrode. The second linear constant current unit has a current setting end, an output end and a negative electrode. The positive electrode of the first linear constant current unit is the positive electrode of the linear constant current circuit. One end of the third resistor is connected to the current setting end of the first linear constant current unit, one end of the second resistor is connected to the current setting end of the second linear constant current unit, the output end of the first linear constant current unit is connected to the output end of the second linear constant current unit, and the connection end is the output end of the linear constant current circuit. The other end of the third resistor, the other end of the second resistor, the negative electrode of the first linear constant current unit and the negative electrode of the second linear constant current unit are connected, and the connection end is the negative electrode of the linear constant current circuit. The PWM adjustment end of the first linear constant current unit is the adjustment end of the linear constant current circuit.

6. The intelligent LED lamp circuit compatible with a phase-cutting dimmer according to claim 3, characterized in that The voltage stabilizing circuit includes a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a second diode, a third diode, a first transistor and a first integrated circuit, wherein the seventh capacitor is an electrolytic capacitor, the second diode is a rectifier diode, the third diode is a voltage stabilizing diode, the first integrated circuit is a three-terminal voltage stabilizing circuit having an input terminal, an output terminal and an adjustment terminal, one end of the sixth capacitor is the input terminal of the voltage stabilizing circuit, the other end of the sixth capacitor is connected to one end of the seventh resistor, the other end of the seventh resistor, the negative electrode of the second diode and the positive electrode of the third diode are connected, and the positive electrode of the second diode, one end of the fourth resistor and the base of the first transistor are connected , the cathode of the third diode, the anode of the seventh capacitor, and one end of the third capacitor are connected to the input end of the first integrated circuit, the output end of the first integrated circuit, one end of the fourth capacitor and one end of the fifth resistor are connected, and the connection end is the output end of the voltage stabilizing circuit, the other end of the fifth resistor and one end of the sixth resistor are connected to the collector of the first transistor, the other end of the sixth resistor is connected to one end of the fifth capacitor, the other end of the fourth resistor, the cathode of the seventh capacitor, the other end of the third capacitor, the other end of the fourth capacitor, the other end of the fifth capacitor, the emitter of the first transistor and the adjustment end of the first integrated circuit are connected, and the connection end is the cathode of the voltage stabilizing circuit.

7. The intelligent LED lamp circuit compatible with a phase-cutting dimmer according to claim 3, characterized in that It also includes an RC absorption circuit, which has a positive electrode and a negative electrode. The positive electrode of the RC absorption circuit is connected to the positive output end of the rectifier circuit, and the negative electrode of the RC absorption circuit is connected to the negative output end of the rectifier circuit.

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