A hybrid dimming driving circuit

Abstract

The invention discloses a hybrid dimming driving circuit, which comprises a thyristor dimmer, a thyristor dimming constant current circuit composed of a first rectifier circuit, a discharge circuit and a constant current circuit connected in sequence, a wireless control circuit composed of a second rectifier circuit, a constant voltage power supply circuit and a wireless control module connected in sequence, a detection circuit, the constant current circuit dims an LED load by adopting an analog dimming control method, the wireless control module performs wireless remote dimming on the LED load through the constant current circuit, the detection circuit detects the phase or output voltage change of the thyristor dimmer, when the detection circuit outputs a phase change signal or a voltage change signal to the wireless control module, the wireless control module controls the brightness of the LED load through the constant current circuit to reset to a non-dimming or non-dimming color adjustment control state of the wireless control module; the advantage is that even if the wireless communication device dims the LED lamp through the wireless control module first, the LED lamp can still be adjusted within the entire brightness area through the thyristor dimmer.

Description

Technical Field

[0001] The invention relates to a driving circuit for an LED lighting product, and in particular to a hybrid dimming driving circuit. Background Art

[0002] In the past, most households in the United States usually use thyristor dimmers for dimming. The voltage phase angle is adjusted manually to make the thyristor conduct and dim. In recent years, with the rapid development of wireless communication technology and Internet technology, wireless communication technology and Internet technology have gradually been applied to LED lighting products, and wireless switching, dimming and color adjustment of LED lighting products have been performed. Due to the addition of wireless communication technology, LED lights can be dimmed by thyristors or wireless communication devices. The two can be adjusted separately or mutually. When the two are adjusted mutually, if the wireless communication device first dims the LED light through the wireless control module, and then continues to dim through the thyristor dimmer, then the thyristor dimmer can only adjust the remaining part of the light, but cannot adjust the entire brightness area. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a hybrid dimming drive circuit, which enables the LED lamp to be adjusted within the entire brightness range through a thyristor dimmer even if the wireless communication device dims the LED lamp through a wireless control module first.

[0004] The technical solution adopted by the present invention to solve the above technical problems is: a hybrid dimming drive circuit, including a thyristor dimmer, a thyristor dimming constant current circuit and a wireless control circuit, the thyristor dimming constant current circuit is composed of a first rectifier circuit, a discharge circuit, and a constant current circuit connected in sequence, the wireless control circuit is composed of a second rectifier circuit, a constant voltage power supply circuit, and a wireless control module connected in sequence, the mains power passes through the thyristor dimmer and is connected to the input end of the first rectifier circuit in one way and to the input end of the second rectifier circuit in another way, the output end of the constant current circuit is connected to the LED load, and the wireless control The output end of the control module is connected to the dimming end of the constant current circuit to perform wireless remote dimming on the LED load, and is characterized in that: the constant current circuit dims the LED load using an analog dimming control method, and the hybrid dimming drive circuit also includes a detection circuit for detecting a phase change of the thyristor dimmer or an output voltage change of the thyristor dimmer. When the detection circuit outputs a phase change signal or a voltage change signal to the wireless control module, the wireless control module controls the brightness of the LED load through the constant current circuit to reset to the non-dimming or non-dimming color control state of the wireless control module.

[0005] The input end of the detection circuit is connected to the output end of the second rectifier circuit, and the output end of the detection circuit is connected to the input end of the wireless control module.

[0006] The detection circuit is composed of a sixth resistor, a seventh resistor, a third capacitor and a voltage-stabilizing diode. One end of the sixth resistor is connected to an output end of the second rectifier circuit, and the other end of the sixth resistor is respectively connected to one end of the seventh resistor, one end of the third capacitor, the negative electrode of the voltage-stabilizing diode and the input end of the wireless control module. The other end of the seventh resistor is respectively connected to the other end of the third capacitor and the positive electrode of the voltage-stabilizing diode, and their common connection end is connected to another output end of the second rectifier circuit.

[0007] The input end of the detection circuit is connected to the input end of the second rectifier circuit, and the output end of the detection circuit is connected to the input end of the wireless control module.

[0008] The detection circuit is composed of a sixth resistor, a seventh resistor, a third capacitor and a Zener diode. One end of the sixth resistor is connected to an input end of the second rectifier circuit, and the other end of the sixth resistor is respectively connected to one end of the seventh resistor, one end of the third capacitor, the negative electrode of the Zener diode and the input end of the wireless control module. The other end of the seventh resistor is respectively connected to the other end of the third capacitor and the positive electrode of the Zener diode, and their common connection end is connected to another input end of the second rectifier circuit.

[0009] A signal isolation conversion circuit is added between the output end of the wireless control module and the dimming end of the constant current circuit, so that the wireless control module and the constant current circuit share a common ground before signal isolation, and the wireless control module and the constant current circuit share a common ground after signal isolation. Since the wireless control module and the constant current circuit do not share a common ground, a signal isolation conversion circuit is introduced to make the two share a common ground before and after signal isolation.

[0010] The signal isolation conversion circuit is an optocoupler circuit.

[0011] The discharge circuit includes a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, and a control chip with model number JW1695. One end of the first resistor is connected to an output end of the first rectifier circuit, the other end of the first resistor is respectively connected to one end of the second resistor and one end of the first capacitor, and their common connection end is connected to the third pin of the control chip, the other end of the second resistor is connected to the other end of the first capacitor, and their common connection end is connected to the other output end of the first rectifier circuit, the first pin of the control chip is connected to an output end of the first rectifier circuit through the third resistor, the second pin of the control chip is connected to the other output end of the first rectifier circuit through the second capacitor, the fourth pin of the control chip is connected to the constant current circuit, and the fifth to eighth pins of the control chip are all connected to the other output end of the first rectifier circuit. When the city power is rectified by the first rectifier circuit and input into the control chip through the first resistor, if there is a thyristor dimmer dimming at this time, the voltage change rate output to the control chip is large, so that the control chip is turned on and provides a maintenance current to the thyristor dimmer; if there is no thyristor dimmer dimming, the control chip is disconnected and does not work; the use of a bleed circuit can improve the power efficiency when the thyristor dimmer is not connected.

[0012] The constant current circuit includes a constant current control chip of model BP5788DJ, the wireless control module of model TYWE3L, and the constant voltage power supply circuit includes a constant voltage chip of model BP8519C.

[0013] The input end of the detection circuit is connected to the output end of the first rectifier circuit, and the output end of the detection circuit is connected to the input end of the wireless control module; or the input end of the detection circuit is connected to the output end of the first rectifier circuit, and the output end of the detection circuit is connected to the input end of the wireless control module.

[0014] Compared with the prior art, the advantages of the present invention are:

[0015] 1) When the thyristor dimmer is dimming, the detection circuit detects that the phase of the thyristor dimmer has changed or the output voltage has changed, and inputs the phase change signal or the voltage change signal to the wireless control module. The wireless control module resets the brightness of the LED load to the non-dimming or non-dimming color control state of the wireless control module. At this time, the thyristor dimmer can dim the LED load within the entire brightness range, so that even if the wireless communication device dims the LED load through the wireless control module first, the LED load can still be adjusted within the entire brightness range through the thyristor dimmer.

[0016] 2) The hybrid dimming drive circuit can directly use the thyristor dimmer to adjust the entire brightness range of the LED load; after using a wireless communication device (such as APP) to adjust the brightness of the LED load, it will not affect the thyristor dimmer to adjust the entire brightness range of the LED load; after using the thyristor dimmer to dim the LED load, the wireless communication device can only be used to adjust the remaining dimming brightness.

[0017] 3) The constant current circuit in the hybrid dimming drive circuit uses an analog dimming control method to dim the LED load instead of a PWM chopping dimming method, because the PWM chopping dimming method will cause the lamp to flicker during the dimming process.

[0018] 4) Since the thyristor dimmer needs to provide a holding current during the dimming process, a bleeder circuit is used to provide a holding circuit for the thyristor dimmer.

[0019] 5) By setting a first rectifier circuit, the mains power supplies power to the constant current circuit, and by setting a second rectifier circuit, the mains power supplies power to the wireless control module, so that the two do not interfere with each other. When the thyristor dimmer is adjusted to the low end, the second rectifier circuit can still power the wireless control module. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a block diagram of a hybrid dimming driving circuit according to Embodiment 1;

[0021] Figure 2 is a specific circuit diagram of the hybrid dimming driving circuit of Example 1;

[0022] Figure 3 is a block diagram of a hybrid dimming driving circuit according to Embodiment 2;

[0023] Figure 4 It is a specific circuit diagram of the hybrid dimming driving circuit of the second embodiment. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with reference to the accompanying drawings.

[0025] Embodiment 1:

[0026] This embodiment proposes a hybrid dimming driving circuit, such as Figure 1 and Figure 2As shown, it includes a thyristor dimmer 1, a thyristor dimming constant current circuit 2, a wireless control circuit 3, and a detection circuit 4. The thyristor dimming constant current circuit 2 is composed of a first rectifier circuit BD1, a bleed circuit 21, and a constant current circuit 22 connected in sequence. The wireless control circuit 3 is composed of a second rectifier circuit BD2, a constant voltage power supply circuit 31, and a wireless control module M1 connected in sequence. After the mains passes through the thyristor dimmer 1, one path is connected to the input end of the first rectifier circuit BD1, and the other path is connected to the input end of the second rectifier circuit BD2. The output end of the first rectifier circuit BD1 is connected to the input end of the bleed circuit 21, the output end of the bleed circuit 21 is connected to the input end of the constant current circuit 22, and the output end of the constant current circuit 22 is connected to the LED load 9. The constant current circuit 22 uses an analog dimming control method to control the LED load 9. Dimming is performed, the output end of the second rectifier circuit BD2 is connected to the input end of the constant voltage power supply circuit 31, the output end of the constant voltage power supply circuit 31 is connected to the power supply end of the wireless control module M1, the output end of the wireless control module M1 is connected to the dimming end of the constant current circuit 22 to perform wireless remote dimming on the LED load 9, the input end of the detection circuit 4 is connected to the output end of the second rectifier circuit BD2, the output end of the detection circuit 4 is connected to the input end of the wireless control module M1, the detection circuit 4 is used to detect the phase change of the thyristor dimmer 1 or the output voltage change of the thyristor dimmer 1, when the detection circuit 4 outputs a phase change signal or a voltage change signal to the wireless control module M1, the wireless control module M1 controls the brightness of the LED load 9 through the constant current circuit 22 to reset to the non-dimming or non-dimming color control state of the wireless control module M1.

[0027] In this embodiment, a signal isolation conversion circuit 5 is additionally provided between the output end of the wireless control module M1 and the dimming end of the constant current circuit 22, so that the wireless control module M1 and the constant current circuit 22 share a common ground before signal isolation, and the wireless control module M1 and the constant current circuit 22 also share a common ground after signal isolation. Since the wireless control module M1 and the constant current circuit 22 do not share a common ground, the signal isolation conversion circuit 5 is introduced so that the two share a common ground before and after signal isolation; the signal isolation conversion circuit 5 uses an optical coupling circuit.

[0028] In this embodiment, the detection circuit 4 is composed of a sixth resistor R6, a seventh resistor R7, a third capacitor C3 and a Zener diode ZD1. One end of the sixth resistor R6 is connected to an output end of the second rectifier circuit BD2, and the other end of the sixth resistor R6 is respectively connected to one end of the seventh resistor R7, one end of the third capacitor C3, the negative electrode of the Zener diode ZD1 and the input end of the wireless control module M1, and the other end of the seventh resistor R7 is respectively connected to the other end of the third capacitor C3 and the positive electrode of the Zener diode ZD1, and their common connection end is connected to another output end of the second rectifier circuit BD2.

[0029] In this embodiment, the discharge circuit 21 includes a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, and a control chip U1 of model JW1695. One end of the first resistor R1 is connected to an output end of the first rectifier circuit BD1, the other end of the first resistor R1 is respectively connected to one end of the second resistor R2 and one end of the first capacitor C1, and the common connection end thereof is connected to the third pin of the control chip U1, the other end of the second resistor R2 is connected to the other end of the first capacitor C1, and the common connection end thereof is connected to the other output end of the first rectifier circuit BD1, the first pin of the control chip U1 is connected to an output end of the first rectifier circuit BD1 through the third resistor R3, the second pin of the control chip U1 is connected to the other output end of the first rectifier circuit BD1 through the second capacitor C2, the fourth pin of the control chip U1 is connected to the constant current circuit 22, and the fifth to eighth pins of the control chip U1 are all connected to the other output end of the first rectifier circuit BD1. When the city power is rectified by the first rectifier circuit BD1 and then input into the control chip U1 through the first resistor R1, if there is a thyristor dimmer 1 dimming at this time, the voltage change rate output to the control chip U1 is large, so that the control chip U1 is turned on and provides a maintenance current to the thyristor dimmer 1; if there is no thyristor dimmer 1 dimming, the control chip U1 is disconnected and does not work; the use of the discharge circuit 21 can improve the power efficiency when the thyristor dimmer 1 is not connected.

[0030] In this embodiment, the first rectifier circuit BD1 and the second rectifier circuit BD2 both adopt conventional rectifier stacks, that is, they are composed of four diodes; the constant current circuit 22 includes a constant current control chip U2 of model BP5778DJ, a fourth resistor R4, a fifth resistor R5, a first diode D1, a first electrolytic capacitor CE1, and a second electrolytic capacitor CE2, the first foot of the constant current control chip U2 is connected to an output end of the signal isolation conversion circuit 5, the second foot of the constant current control chip U2 is grounded through the fourth resistor R4, the third foot of the constant current control chip U2 is connected to another output end of the signal isolation conversion circuit 5, the fourth foot of the constant current control chip U2 is grounded through the fifth resistor R5, and the fifth foot of the constant current control chip U2 is respectively connected to one of the LED loads 9. The cathode of an LED lamp bead LED-2 is connected to the cathode of the second electrolytic capacitor CE2, the 6th pin of the constant current control chip U2 is respectively connected to the cathode of another LED lamp bead LED-1 in the LED load 9 and the cathode of the first electrolytic capacitor CE1, the 7th pin of the constant current control chip U2 is suspended, the 8th pin of the constant current control chip U2, the anode of an LED lamp bead LED-2, the anode of the second electrolytic capacitor CE2, the anode of another LED lamp bead LED-1 and the anode of the first electrolytic capacitor CE1 are all connected to the cathode of the first diode D1, the anode of the first diode D1 is connected to the common connection end of the first resistor R1 and the third resistor R3, and the 9th pin of the constant current control chip U2 is grounded; the constant voltage power supply circuit 31 includes a BP8 The constant voltage chip U3 of 519C, the eighth resistor R8, the ninth resistor R9, the tenth resistor R10, the fourth capacitor C4, the second diode D2, the third electrolytic capacitor CE3, the first inductor L1, the second inductor L2, the third diode D3, the fourth electrolytic capacitor CE4, and the eleventh resistor R11, the positive electrode of the second diode D2 is connected to an output end of the second rectifier circuit BD2, the negative electrode of the second diode D2 is respectively connected to one end of the first inductor L1 and one end of the eighth resistor R8, the other end of the first inductor L1 is connected to the other end of the eighth resistor R8, and the common connection end thereof is respectively connected to the positive electrode of the third electrolytic capacitor CE3 and the first foot of the constant voltage chip U3, and the negative electrode of the third electrolytic capacitor CE3 is connected to the other end of the second rectifier circuit BD2. The output end is connected, the second pin of the constant voltage chip U3 is suspended, the third pin of the constant voltage chip U3 is respectively connected to one end of the ninth resistor R9 and one end of the tenth resistor R10, the other end of the ninth resistor R9 is respectively connected to one end of the second inductor L2, the positive electrode of the fourth electrolytic capacitor CE4, and one end of the eleventh resistor R11, and its common connection end is connected to the power supply end of the wireless control module M1, the other end of the second inductor L2 is respectively connected to the other end of the tenth resistor R10, the negative electrode of the third diode D3, one end of the fourth capacitor C4 and the fifth pin of the constant voltage chip U3, the other end of the fourth capacitor C4 is connected to the fourth pin of the constant voltage chip U3, the positive electrode of the third diode D3, the negative electrode of the fourth electrolytic capacitor CE4, and the other end of the eleventh resistor R11 are all grounded;The model of the wireless control module M1 is TYWE3L, the first pin of the wireless control module M1 is the power supply terminal, the second pin of the wireless control module M1 is grounded, the third pin of the wireless control module M1 is connected to an input terminal of the signal isolation conversion circuit 5, the fourth pin of the wireless control module M1 is connected to another input terminal of the signal isolation conversion circuit 5, the fifth and sixth pins of the wireless control module M1 are suspended, and the seventh pin of the wireless control module M1 is the input terminal connected to the cathode of the voltage-stabilizing diode ZD1 in the detection circuit 4. ;

[0031] Embodiment 2:

[0032] This embodiment proposes a hybrid dimming driving circuit, such as Figure 3 and Figure 4 As shown, its structure is basically the same as that of the first embodiment, and the only difference is that: the input end of the detection circuit 4 is connected to the input end of the second rectifier circuit BD2, the output end of the detection circuit 4 is connected to the input end of the wireless control module M1, the detection circuit 4 is composed of a sixth resistor R6, a seventh resistor R7, a third capacitor C3 and a Zener diode ZD1, one end of the sixth resistor R6 is connected to an input end of the second rectifier circuit BD2, the other end of the sixth resistor R6 is respectively connected to one end of the seventh resistor R7, one end of the third capacitor C3, the negative electrode of the Zener diode ZD1 and the input end of the wireless control module M1, the other end of the seventh resistor R7 is respectively connected to the other end of the third capacitor C3 and the positive electrode of the Zener diode ZD1, and their common connection end is connected to the other input end of the second rectifier circuit BD2.

[0033] In actual design, the setting position of the detection circuit 4 can also be changed, such as connecting the input end of the detection circuit 4 to the output end of the first rectifier circuit BD1, and connecting the output end of the detection circuit 4 to the input end of the wireless control module M1; or connecting the input end of the detection circuit 4 to the input end of the first rectifier circuit BD1, and connecting the output end of the detection circuit 4 to the input end of the wireless control module M1.

Claims

1. A hybrid dimming drive circuit, comprising a thyristor dimmer, a thyristor dimming constant current circuit and a wireless control circuit, wherein the thyristor dimming constant current circuit is composed of a first rectifier circuit, a discharge circuit and a constant current circuit connected in sequence, and the wireless control circuit is composed of a second rectifier circuit, a constant voltage power supply circuit and a wireless control module connected in sequence, and the mains electricity passes through the thyristor dimmer and is connected to the input end of the first rectifier circuit in one way and to the input end of the second rectifier circuit in another way, the output end of the constant current circuit is connected to an LED load, and the output end of the wireless control module is connected to the dimming end of the constant current circuit to perform wireless remote dimming on the LED load, characterized in that: The constant current circuit dims the LED load using an analog dimming control method. The hybrid dimming drive circuit also includes a detection circuit for detecting a phase change of the thyristor dimmer or an output voltage change of the thyristor dimmer. When the detection circuit outputs a phase change signal or a voltage change signal to the wireless control module, the wireless control module controls the brightness of the LED load through the constant current circuit and resets it to the non-dimming or non-dimming color control state of the wireless control module.

2. The hybrid dimming driving circuit according to claim 1, characterized in that: The input end of the detection circuit is connected to the output end of the second rectifier circuit, and the output end of the detection circuit is connected to the input end of the wireless control module.

3. The hybrid dimming driving circuit according to claim 2, characterized in that: The detection circuit is composed of a sixth resistor, a seventh resistor, a third capacitor and a voltage-stabilizing diode. One end of the sixth resistor is connected to an output end of the second rectifier circuit, and the other end of the sixth resistor is respectively connected to one end of the seventh resistor, one end of the third capacitor, the negative electrode of the voltage-stabilizing diode and the input end of the wireless control module. The other end of the seventh resistor is respectively connected to the other end of the third capacitor and the positive electrode of the voltage-stabilizing diode, and their common connection end is connected to another output end of the second rectifier circuit.

4. The hybrid dimming driving circuit according to claim 1, characterized in that: The input end of the detection circuit is connected to the input end of the second rectifier circuit, and the output end of the detection circuit is connected to the input end of the wireless control module.

5. The hybrid dimming driving circuit according to claim 4, characterized in that: The detection circuit is composed of a sixth resistor, a seventh resistor, a third capacitor and a Zener diode. One end of the sixth resistor is connected to an input end of the second rectifier circuit, and the other end of the sixth resistor is respectively connected to one end of the seventh resistor, one end of the third capacitor, the negative electrode of the Zener diode and the input end of the wireless control module. The other end of the seventh resistor is respectively connected to the other end of the third capacitor and the positive electrode of the Zener diode, and their common connection end is connected to another input end of the second rectifier circuit.

6. A hybrid dimming driving circuit according to any one of claims 1 to 5, characterized in that: A signal isolation conversion circuit is additionally provided between the output end of the wireless control module and the dimming end of the constant current circuit, so that the wireless control module and the constant current circuit share a common ground before signal isolation and after signal isolation.

7. The hybrid dimming driving circuit according to claim 6, characterized in that: The signal isolation conversion circuit is an optocoupler circuit.

8. The hybrid dimming driving circuit according to claim 6, characterized in that: The discharge circuit includes a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, and a control chip with model number JW1695. One end of the first resistor is connected to an output end of the first rectifier circuit, the other end of the first resistor is respectively connected to one end of the second resistor and one end of the first capacitor, and their common connection end is connected to the third pin of the control chip, the other end of the second resistor is connected to the other end of the first capacitor, and their common connection end is connected to the other output end of the first rectifier circuit, the first pin of the control chip is connected to an output end of the first rectifier circuit through the third resistor, the second pin of the control chip is connected to the other output end of the first rectifier circuit through the second capacitor, the fourth pin of the control chip is connected to the constant current circuit, and the fifth to eighth pins of the control chip are all connected to the other output end of the first rectifier circuit.

9. The hybrid dimming driving circuit according to claim 1, characterized in that: The constant current circuit includes a constant current control chip of model BP5788DJ, the wireless control module of model TYWE3L, and the constant voltage power supply circuit includes a constant voltage chip of model BP8519C.

10. The hybrid dimming driving circuit according to claim 1, characterized in that: The input end of the detection circuit is connected to the output end or the input end of the first rectifier circuit, and the output end of the detection circuit is connected to the input end of the wireless control module.

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