Linear phase-cut dimming LED lamp circuit with PWM port

Abstract

The utility model discloses a linear phase-cut dimming LED lamp circuit with a PWM port, which comprises a rectifying circuit, a linear dimming circuit and an LED light-emitting circuit, and is characterized in that the rectifying circuit is used for converting alternating-current voltage which is chopped and modulated by a phase-cut dimmer into direct-current voltage and outputting the direct-current voltage; the linear dimming circuit is used for converting direct current voltage output by the rectifying circuit into corresponding direct current to drive the LED light emitting circuit to emit light, and the linear constant current circuit is used for outputting corresponding direct current to drive the LED light emitting circuit to emit light under the control of an externally input PWM signal; the circuit has the advantage that the circuit can be expanded and applied to linear constant-current LED lamps compatible with dual-mode dimming.

Description

Technical Field

[0001] The utility model relates to a linear phase - cuttable dimming LED lamp circuit, in particular to a linear phase - cuttable dimming LED lamp circuit with a PWM port. Background Technique

[0002] Currently, connected in a dimming circuit composed of a phase - cut dimming device, the linear phase - cuttable dimming LED lamp circuit used in the linearly dimmable LED lamp dimmed by the phase - cut dimming device generally includes a rectification circuit, a linear dimming circuit, and an LED lighting circuit. The rectification circuit has a first input terminal, a second input terminal, a positive output terminal, and a negative output terminal; the linear dimming circuit has a positive electrode, a negative electrode, a positive output terminal, and a negative output terminal, and the magnitude of the current output between its positive output terminal and negative output terminal corresponds to the magnitude of the voltage applied between its positive electrode and negative electrode; the LED lighting circuit has a positive electrode and a negative electrode, and its luminous intensity corresponds to the magnitude of the current applied between its positive electrode and negative electrode; the positive electrode of the LED lighting circuit is connected to the positive output terminal of the linear dimming circuit, the negative electrode of the LED lighting circuit is connected to the negative output terminal of the linear dimming circuit, the positive electrode of the linear dimming circuit is connected to the positive output terminal of the rectification circuit, and the negative electrode of the linear dimming circuit is connected to the negative output terminal of the rectification circuit. When an AC voltage subjected to chopping modulation by the phase - cut dimming device is applied between the first input terminal and the second input terminal of the rectification circuit, the rectification circuit outputs a corresponding chopped pulsating DC voltage at its positive output terminal and negative output terminal. At this time, a pulsating DC voltage is applied between the positive electrode and the negative electrode of the linear dimming circuit, and a DC current of a corresponding magnitude is output between its positive output terminal and negative output terminal to drive the LED lighting circuit to emit light.

[0003] The above - mentioned linear phase - cuttable dimming LED lamp circuit has the characteristics of low cost and good performance, and has been widely used in various light source products.

[0004] With the development of personalized LED lighting products, there is also a wide market demand for dimmable LED lamps that can communicate wirelessly with an external controller and be dimmed under the control of a wireless signal (i.e., a dimming signal) sent by the external controller. Thus, there is a wide demand for a compatible dual - mode dimming linear constant - current LED lamp that can both communicate wirelessly with an external controller through a wireless communication module and be dimmed under the control of a wireless signal sent by the external controller, and can also be installed in an existing dimming circuit composed of a phase - cut dimming device that widely exists, and be dimmed using a traditional tangential dimming device, having the dual dimming functions of wireless dimming and dimming device dimming.

[0005] However, the wireless communication module usually converts the wireless signal sent by the external controller into a PWM signal for dimming control. Since the above linear phase-cuttable dimming LED lamp circuit has no PWM port, it cannot cooperate with the auxiliary power supply and the wireless communication module and be controlled by the dimming signal sent by the external controller, so its application in linear constant-current LED lamps compatible with dual-mode dimming is restricted to a certain extent. Summary of the Invention

[0006] The technical problem to be solved by the present utility model is to provide a linear phase-cuttable dimming LED lamp circuit with a PWM port that can be extended to linear constant-current LED lamps compatible with dual-mode dimming.

[0007] The technical solution adopted by the present utility model to solve the above technical problem is: a linear phase-cuttable dimming LED lamp circuit with a PWM port, including a rectification circuit, a linear dimming circuit, and an LED lighting circuit. The rectification circuit is used to convert the AC voltage chopped and modulated by the phase-cutting dimmer into a DC voltage for output. The linear dimming circuit is used to convert the DC voltage output by the rectification circuit into a corresponding DC current to drive the LED lighting circuit to emit light. The linear phase-cuttable dimming LED lamp circuit with a PWM port further includes a linear constant-current circuit, and the linear constant-current circuit is used to output a corresponding DC current to drive the LED lighting circuit to emit light under the control of an externally input PWM signal.

[0008] The described rectifier circuit has a first input terminal, a second input terminal, a positive output terminal, and a negative output terminal; the described linear dimming circuit has a positive electrode, a negative electrode, a positive output terminal, and a negative output terminal, and the magnitude of the current output between its positive output terminal and negative output terminal corresponds to the magnitude of the voltage applied between its positive electrode and negative electrode; the described LED lighting circuit has a positive electrode and a negative electrode, and its luminous intensity corresponds to the magnitude of the current applied between its positive electrode and negative electrode; the described linear constant current circuit has an output terminal, a negative electrode, and a PWM terminal, and the magnitude of the current output by its output terminal corresponds to the duty cycle of the PWM signal applied to it; the positive electrode of the described LED lighting circuit is connected to the positive output terminal of the described linear dimming circuit, the negative electrode of the described LED lighting circuit is connected to the negative output terminal of the described linear dimming circuit, the positive electrode of the described linear dimming circuit is connected to the positive output terminal of the described rectifier circuit, the negative electrode of the described linear dimming circuit is connected to the negative output terminal of the described rectifier circuit, the output terminal of the described linear constant current circuit is connected to the negative electrode of the described LED lighting circuit, the negative electrode of the described linear constant current circuit is connected to the negative electrode of the described linear dimming circuit, the PWM terminal of the described linear constant current circuit is the PWM port of the linear phase-cuttable dimming LED lamp circuit with a PWM port, the first input terminal of the described rectifier circuit is the first input terminal of the linear phase-cuttable dimming LED lamp circuit with a PWM port, and the second input terminal of the described rectifier circuit is the second input terminal of the linear phase-cuttable dimming LED lamp circuit with a PWM port.

[0009] The described rectifier circuit is a full-bridge rectifier stack. One AC input pin of the full-bridge rectifier stack is the first input terminal of the rectifier circuit, the other AC input pin of the full-bridge rectifier stack is the second input terminal of the rectifier circuit, the positive voltage output pin of the full-bridge rectifier stack is the positive output terminal of the rectifier circuit, and the negative voltage output pin of the full-bridge rectifier stack is the negative output terminal of the rectifier circuit.

[0010] The described linear dimming circuit includes a first integrated circuit of model BP5178, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first diode, and a first capacitor. The first diode is a rectifier diode, and the first capacitor is an electrolytic capacitor. One end of the first resistor, one end of the fifth resistor, and the positive electrode of the first diode are connected, and the connection end is the positive electrode of the linear dimming circuit. The negative electrode of the first diode, the HV pin of the first integrated circuit, and the positive electrode of the first capacitor are connected, and the connection end is the positive output end of the linear dimming circuit. The other end of the first resistor, one end of the second resistor, and the TRIAC pin of the first integrated circuit are connected. One end of the third resistor, one end of the fourth resistor, and the CS2 pin of the first integrated circuit are connected. The other end of the fourth resistor and the CS1 pin of the first integrated circuit are connected. One end of the sixth resistor and the VD pin of the first integrated circuit are connected. The other end of the sixth resistor, the DRAIN pin of the first integrated circuit, and the negative electrode of the first capacitor are connected, and the connection end is the negative output end of the linear dimming circuit. The other end of the second resistor, the other end of the third resistor, the RTH pin of the first integrated circuit, and the bottom electrode of the first integrated circuit are connected, and the connection end is the negative electrode of the linear dimming circuit. The other end of the fifth resistor and the VIN pin of the first integrated circuit are connected.

[0011] The described linear constant current circuit includes a second integrated circuit of model JW1691H and a seventh resistor. The OUT pin of the second integrated circuit is the output end of the linear constant current circuit. The EXT pin of the second integrated circuit and one end of the seventh resistor are connected. The other end of the seventh resistor is the PWM end of the linear constant current circuit. The GND pin of the second integrated circuit is the negative electrode of the linear constant current circuit.

[0012] Compared with the prior art, the advantages of the present utility model are as follows: by setting a linear constant current circuit, the linear constant current circuit can output a corresponding direct current to drive the LED lighting circuit to emit light under the control of an externally input PWM signal. When cooperating with a wireless communication module, it can communicate wirelessly with an external controller through the wireless communication module and perform dimming under the control of a wireless signal sent by the external controller. At the same time, it can be installed in an existing dimming circuit composed of a phase-cut dimmer, and use the alternating voltage chopped and modulated by the traditional tangential dimmer for dimming. It has the dual dimming functions of wireless dimming and dimmer dimming, and can be extended and applied to linear constant current LED lamps compatible with dual-mode dimming. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1It is the structural block diagram of the linear phase - cuttable dimming LED lamp circuit with a PWM port of the present utility model;

[0014] Figure 2 It is the circuit diagram of the linear phase - cuttable dimming LED lamp circuit with a PWM port of the present utility model. Specific embodiments

[0015] The present utility model will be further described in detail below in conjunction with the embodiments with the accompanying drawings.

[0016] Embodiment 1: A linear phase - cuttable dimming LED lamp circuit with a PWM port includes a rectification circuit, a linear dimming circuit, and an LED lighting circuit. The rectification circuit is used to convert the AC voltage chopped and modulated by a phase - cut dimmer into a DC voltage for output. The linear dimming circuit is used to convert the DC voltage output by the rectification circuit into a corresponding DC current to drive the LED lighting circuit to emit light. The linear phase - cuttable dimming LED lamp circuit with a PWM port further includes a linear constant - current circuit, and the linear constant - current circuit is used to output a corresponding DC current to drive the LED lighting circuit to emit light under the control of an externally input PWM signal.

[0017] In this embodiment, by setting the linear constant - current circuit, the linear constant - current circuit can output a corresponding DC current to drive the LED lighting circuit to emit light under the control of an externally input PWM signal. When cooperating with a wireless communication module, it can communicate wirelessly with an external controller through the wireless communication module, and perform dimming under the control of the wireless signal sent by the external controller. At the same time, it can be installed in the existing dimming line composed of a phase - cut dimmer that widely exists, and use the AC voltage chopped and modulated by the traditional tangential dimmer for dimming, having the dual dimming functions of wireless dimming and dimmer dimming, so that it can be extended and applied to linear constant - current LED lamps compatible with dual - mode dimming.

[0018] Embodiment 2: This embodiment is basically the same as Embodiment 1, the difference is that: in this embodiment, as Figure 1As shown, the rectifier circuit has a first input terminal, a second input terminal, a positive output terminal, and a negative output terminal; the linear dimming circuit has a positive electrode, a negative electrode, a positive output terminal, and a negative output terminal, and the magnitude of the current output between its positive output terminal and negative output terminal corresponds to the magnitude of the voltage applied to its positive electrode and negative electrode; the LED lighting circuit has a positive electrode and a negative electrode, and its luminous intensity corresponds to the magnitude of the current flowing between its positive electrode and negative electrode; the linear constant current circuit has an output terminal, a negative electrode, and a PWM terminal, and the magnitude of the current output by its output terminal corresponds to the duty cycle of the PWM signal applied thereto; the positive electrode of the LED lighting circuit is connected to the positive output terminal of the linear dimming circuit, the negative electrode of the LED lighting circuit is connected to the negative output terminal of the linear dimming circuit, the positive electrode of the linear dimming circuit is connected to the positive output terminal of the rectifier circuit, the negative electrode of the linear dimming circuit is connected to the negative output terminal of the rectifier circuit, the output terminal of the linear constant current circuit is connected to the negative electrode of the LED lighting circuit, the negative electrode of the linear constant current circuit is connected to the negative electrode of the linear dimming circuit, the PWM terminal of the linear constant current circuit is the PWM terminal of the linear phase-cuttable dimming LED lamp circuit with a PWM port, the first input terminal of the rectifier circuit is the first input terminal of the linear phase-cuttable dimming LED lamp circuit with a PWM port, and the second input terminal of the rectifier circuit is the second input terminal of the linear phase-cuttable dimming LED lamp circuit with a PWM port.

[0019] In this embodiment, when the linear phase-cuttable dimming LED lamp circuit with a PWM port of this embodiment is combined with an auxiliary power supply and a wireless communication module and extended to a linear constant current LED lamp compatible with dual-mode dimming, when the linear constant current LED lamp compatible with dual-mode dimming is installed in a traditional dimming circuit composed of a phase-cutting dimmer, when the conduction angle of the phase-cutting dimmer is at its maximum, the luminous brightness of the linear constant current LED lamp compatible with dual-mode dimming can be adjusted by an external controller at this time; when the external controller adjusts the luminous brightness of the linear constant current LED lamp compatible with dual-mode dimming to the maximum brightness, the brightness of the linear constant current LED lamp compatible with dual-mode dimming can be normally adjusted by the traditional phase-cutting dimmer.

[0020] In this embodiment, when a PWM signal is applied to the PWM terminal of the linear constant current circuit, the brightness of the LED lighting circuit varies with the duty cycle of the PWM signal. When the PWM signal applied to the PWM terminal of the linear constant current circuit varies within the range of 0 - 100% duty cycle, it does not affect the working state of the linear dimming circuit, thus maintaining good compatibility of the linear phase-cuttable dimming LED lamp circuit with a PWM port with an external phase-cutting dimmer.

[0021] Embodiment Three: This embodiment is basically the same as Embodiment Two, except that: in this embodiment, as Figure 2As shown, the rectifier circuit is a full-bridge rectifier bridge stack DB. One AC input pin of the full-bridge rectifier bridge stack DB is the first input terminal of the rectifier circuit, and the other AC input pin of the full-bridge rectifier bridge stack DB is the second input terminal of the rectifier circuit. The positive voltage output pin of the full-bridge rectifier bridge stack DB is the positive output terminal of the rectifier circuit, and the negative voltage output pin of the full-bridge rectifier bridge stack DB is the negative output terminal of the rectifier circuit.

[0022] Embodiment 4: This embodiment is basically the same as Embodiment 3, except that: in this embodiment, as Figure 2 shown, the linear dimming circuit includes a first integrated circuit U1 of model BP5178, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first diode D1 and a first capacitor C1. The first diode D1 is a rectifier diode, and the first capacitor C1 is an electrolytic capacitor. One end of the first resistor R1, one end of the fifth resistor R5 and the positive electrode of the first diode D1 are connected, and the connection end is the positive electrode of the linear dimming circuit. The negative electrode of the first diode D1, the HV pin of the first integrated circuit U1 and the positive electrode of the first capacitor C1 are connected, and the connection end is the positive output terminal of the linear dimming circuit. The other end of the first resistor R1, one end of the second resistor R2 and the TRIAC pin of the first integrated circuit U1 are connected. One end of the third resistor R3, one end of the fourth resistor R4 and the CS2 pin of the first integrated circuit U1 are connected. The other end of the fourth resistor R4 and the CS1 pin of the first integrated circuit U1 are connected. One end of the sixth resistor R6 and the VD pin of the first integrated circuit U1 are connected. The other end of the sixth resistor R6, the DRAIN pin of the first integrated circuit U1 and the negative electrode of the first capacitor C1 are connected, and the connection end is the negative output terminal of the linear dimming circuit. The other end of the second resistor R2, the other end of the third resistor R3, the RTH pin of the first integrated circuit U1 and the bottom electrode of the first integrated circuit U1 are connected, and the connection end is the negative electrode of the linear dimming circuit. The other end of the fifth resistor R5 and the VIN pin of the first integrated circuit U1 are connected.

[0023] Embodiment 5: This embodiment is basically the same as Embodiment 3, except that: in this embodiment, as Figure 2 shown, the linear constant current circuit includes a second integrated circuit U2 of model JW1691H and a seventh resistor R7. The OUT pin of the second integrated circuit U2 is the output terminal of the linear constant current circuit. The EXT pin of the second integrated circuit U2 and one end of the seventh resistor R7 are connected. The other end of the seventh resistor R7 is the PWM terminal of the linear constant current circuit. The GND pin of the second integrated circuit U2 is the negative electrode of the linear constant current circuit.

Claims

1. A linear phase-cuttable dimmable LED lamp circuit with a PWM port, comprising a rectification circuit, a linear dimming circuit and an LED lighting circuit. The rectification circuit is used to convert the AC voltage chopped and modulated by a phase-cut dimmable device into a DC voltage for output. The linear dimming circuit is used to convert the DC voltage output by the rectification circuit into a corresponding DC current to drive the LED lighting circuit to emit light, characterized in that The linear phase-cuttable dimming LED lamp circuit with a PWM port further includes a linear constant current circuit, which is configured to output a corresponding DC current under the control of an externally input PWM signal to drive the LED lighting circuit to emit light.

2. The linear phase-cut dimming LED lamp circuit with a PWM port according to claim 1, characterized in that The rectifier circuit has a first input terminal, a second input terminal, a positive output terminal, and a negative output terminal; the linear dimming circuit has a positive electrode, a negative electrode, a positive output terminal, and a negative output terminal, and the magnitude of the current output between its positive output terminal and negative output terminal corresponds to the magnitude of the voltage applied between its positive electrode and negative electrode; the LED lighting circuit has a positive electrode and a negative electrode, and its luminous intensity corresponds to the magnitude of the current applied between its positive electrode and negative electrode; the linear constant current circuit has an output terminal, a negative electrode, and a PWM terminal, and the magnitude of the current output by its output terminal corresponds to the duty cycle of the PWM signal applied to it; the positive electrode of the LED lighting circuit is connected to the positive output terminal of the linear dimming circuit, the negative electrode of the LED lighting circuit is connected to the negative output terminal of the linear dimming circuit, the positive electrode of the linear dimming circuit is connected to the positive output terminal of the rectifier circuit, the negative electrode of the linear dimming circuit is connected to the negative output terminal of the rectifier circuit, the output terminal of the linear constant current circuit is connected to the negative electrode of the LED lighting circuit, the negative electrode of the linear constant current circuit is connected to the negative electrode of the linear dimming circuit, the PWM terminal of the linear constant current circuit is the PWM port of the linear phase-cuttable dimming LED lamp circuit with a PWM port, the first input terminal of the rectifier circuit is the first input terminal of the linear phase-cuttable dimming LED lamp circuit with a PWM port, and the second input terminal of the rectifier circuit is the second input terminal of the linear phase-cuttable dimming LED lamp circuit with a PWM port.

3. The linear phase-cut dimming LED lamp circuit with a PWM port according to claim 2, characterized in that The rectifier circuit is a full-bridge rectifier stack. One AC input pin of the full-bridge rectifier stack is the first input terminal of the rectifier circuit, the other AC input pin of the full-bridge rectifier stack is the second input terminal of the rectifier circuit, the positive voltage output pin of the full-bridge rectifier stack is the positive output terminal of the rectifier circuit, and the negative voltage output pin of the full-bridge rectifier stack is the negative output terminal of the rectifier circuit.

4. A linear phase-cut dimmable LED lamp circuit with a PWM port according to claim 2, characterized in that The described linear dimming circuit includes a first integrated circuit of model BP5178, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first diode, and a first capacitor. The first diode is a rectifier diode, and the first capacitor is an electrolytic capacitor. One end of the first resistor, one end of the fifth resistor, and the positive electrode of the first diode are connected, and the connection end is the positive electrode of the linear dimming circuit. The negative electrode of the first diode, the HV pin of the first integrated circuit, and the positive electrode of the first capacitor are connected, and the connection end is the positive output terminal of the linear dimming circuit. The other end of the first resistor, one end of the second resistor, and the TRIAC pin of the first integrated circuit are connected. One end of the third resistor, one end of the fourth resistor, and the CS2 pin of the first integrated circuit are connected. The other end of the fourth resistor and the CS1 pin of the first integrated circuit are connected. One end of the sixth resistor and the VD pin of the first integrated circuit are connected. The other end of the sixth resistor, the DRAIN pin of the first integrated circuit, and the negative electrode of the first capacitor are connected, and the connection end is the negative output terminal of the linear dimming circuit. The other end of the second resistor, the other end of the third resistor, the RTH pin of the first integrated circuit, and the bottom electrode of the first integrated circuit are connected, and the connection end is the negative electrode of the linear dimming circuit. The other end of the fifth resistor and the VIN pin of the first integrated circuit are connected.

5. The linear phase-cut dimming LED lamp circuit with a PWM port according to claim 2, wherein The described linear constant current circuit includes a second integrated circuit of model JW1691H and a seventh resistor. The OUT pin of the second integrated circuit is the output terminal of the linear constant current circuit. The EXT pin of the second integrated circuit and one end of the seventh resistor are connected. The other end of the seventh resistor is the PWM terminal of the linear constant current circuit. The GND pin of the second integrated circuit is the negative electrode of the linear constant current circuit.

Images