Dimming circuit and single lamp controller

Abstract

The utility model discloses a light modulation circuit and a single lamp controller, the light modulation circuit comprises a PWM light modulation circuit, a DC light modulation circuit and a control circuit, the PWM light modulation circuit is connected with a lamp, and the PWM light modulation circuit is used for carrying out PWM light modulation on the lamp when receiving a first signal; the DC dimming circuit is connected with the lamp, and the DC dimming circuit is used for performing DC dimming on the lamp when receiving the second signal; the control circuit is connected with the PWM dimming circuit and the DC dimming circuit, and the control circuit is used for outputting a first signal to the PWM dimming circuit to carry out PWM dimming on the lamp or outputting a second signal to the DC dimming circuit to carry out DC dimming on the lamp. According to the utility model, the control circuit respectively controls the PWM dimming circuit to carry out PWM dimming on the lamp and the DC dimming circuit to carry out DC dimming on the lamp, so that only one version of controller needs to be produced in the production process, the versions of the controller do not need to be distinguished, and the production management cost can be reduced.

Description

Technical Field

[0001] The utility model relates to the field of electronic technology, in particular to a dimming circuit and a single lamp controller. Background Art

[0002] There are many types of power dimming interfaces on the market. The mainstream ones are PWM, 0-10VDC, and 1-10VDC. However, single-lamp controllers generally adapt the interface according to different power supplies. The dimming interface hardware is solidified after production, and cannot adapt to power supplies with different dimming interfaces.

[0003] Currently, single-lamp controllers basically only have one or two dimming interface outputs and cannot switch between different dimming modes. Before production, the dimming interface of the power supply must be confirmed before production, resulting in the inability to achieve effective distribution.

[0004] In the past, single-lamp controllers generally used narrowband power carrier communication, which had a low communication success rate and was unstable. Therefore, it was difficult to implement online dimming mode modification and the success rate was also low. Utility Model Content

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a dimming circuit and a single lamp controller to solve at least one technical problem.

[0006] According to a first aspect of the present invention, a dimming circuit is provided for dimming a lamp, comprising:

[0007] a PWM dimming circuit, the PWM dimming circuit being connected to the lamp, and configured to perform PWM dimming on the lamp upon receiving a first signal;

[0008] a DC dimming circuit, the DC dimming circuit being connected to the lamp, and configured to perform DC dimming on the lamp upon receiving a second signal;

[0009] A control circuit is connected to the PWM dimming circuit and the DC dimming circuit respectively, and is used to output a first signal to the PWM dimming circuit to perform PWM dimming on the lamp, or to output a second signal to the DC dimming circuit to perform DC dimming on the lamp.

[0010] The dimming circuit of the present invention controls the PWM dimming circuit to perform PWM dimming on the lamp and the DC dimming circuit to perform DC dimming on the lamp through the control circuit, so that only one version of the controller needs to be produced during the production process, and there is no need to distinguish between controller versions, which can reduce production management costs.

[0011] In some embodiments, the PWM dimming circuit includes:

[0012] a PWM control circuit, the PWM control circuit being connected to the control circuit, the PWM control circuit being further configured to implement PWM dimming upon receiving a PWM signal, the PWM control circuit being configured to perform PWM dimming on the lamp upon receiving the first signal;

[0013] Wherein, the control circuit is further configured to output the PWM signal.

[0014] In some embodiments, the PWM dimming circuit further includes:

[0015] a PWM power supply voltage control circuit, the PWM power supply voltage control circuit being connected to the PWM control circuit and the control circuit respectively, the PWM power supply voltage control circuit being configured to adjust a voltage output to the PWM control circuit upon receiving a third signal;

[0016] Wherein, the control circuit is further configured to output the third signal.

[0017] In some embodiments, the PWM power supply voltage control circuit includes:

[0018] a twenty-second MOS transistor, wherein a first end of the twenty-second MOS transistor is connected to the voltage input end, a control end of the twenty-second MOS transistor is connected to the control circuit, and the twenty-second MOS transistor is configured to be turned on upon receiving a fourth signal;

[0019] a nineteenth diode, wherein a first end of the nineteenth diode is connected to the second end of the twenty-second MOS transistor, and a second end of the nineteenth diode is connected to the PWM control circuit;

[0020] a twenty-third MOS transistor, wherein a first end of the twenty-third MOS transistor is connected to the voltage input end, a control end of the twenty-third MOS transistor is connected to the control circuit, and the twenty-third MOS transistor is configured to be turned on upon receiving a fifth signal;

[0021] an eighteenth diode, a first end of the eighteenth diode being connected to the second end of the twenty-third MOS transistor, and a second end of the eighteenth diode being connected to the PWM control circuit;

[0022] The third signal includes a fourth signal and a fifth signal.

[0023] In some embodiments, the PWM control circuit includes:

[0024] a PWM voltage receiving circuit, the PWM voltage receiving circuit being connected to the PWM power supply voltage control circuit, and receiving the voltage output by the PWM power supply voltage control circuit;

[0025] a PWM signal receiving circuit, the PWM signal receiving circuit being connected to the PWM voltage receiving circuit and the control circuit respectively, and the PWM signal receiving circuit being used to implement PWM dimming when receiving the PWM signal;

[0026] A PWM on-off circuit is connected to the PWM signal receiving circuit and the lamp respectively, and is used to turn on the PWM signal receiving circuit and the lamp when receiving the first signal.

[0027] In some embodiments, the PWM voltage receiving circuit includes:

[0028] an eighth diode, a first end of the eighth diode being connected to the PWM power supply voltage control circuit;

[0029] a fifty-ninth resistor, a first end of the fifty-ninth resistor being connected to the second end of the eighth diode;

[0030] a sixtieth resistor, wherein a first end of the sixtieth resistor is connected to a second end of the fifty-ninth resistor, and a second end of the sixtieth resistor is connected to the PWM signal receiving circuit; and / or

[0031] The PWM signal receiving circuit includes:

[0032] an eleventh diode, a first end of the eleventh diode being connected to the control circuit to receive the PWM signal;

[0033] a sixty-first resistor, a first end of the sixty-first resistor being connected to the second end of the eleventh diode;

[0034] a thirteenth transistor, wherein a first end of the thirteenth transistor is connected to the PWM voltage receiving circuit, a second end of the thirteenth transistor is grounded, and a control end of the thirteenth transistor is connected to the second end of the sixty-first resistor;

[0035] a sixty-third resistor, wherein a first end of the sixty-third resistor is connected to the control end of the thirteenth transistor, and a second end of the sixty-third resistor is grounded; and / or

[0036] The PWM on-off circuit comprises:

[0037] a 20th MOS transistor, wherein a first end of the 20th MOS transistor is connected to the PWM signal receiving circuit, and a control end of the 20th MOS transistor is connected to the control circuit to receive the first signal;

[0038] A second fuse, wherein a first end of the second fuse is connected to the second end of the twentieth MOS tube, and a second end of the second fuse is connected to the lamp.

[0039] In some embodiments, the DC dimming circuit includes:

[0040] a voltage regulating circuit, the voltage regulating circuit being connected to the control circuit, the voltage regulating circuit being configured to regulate an output voltage upon receiving a voltage regulating signal, wherein the control circuit is further configured to output the voltage regulating signal;

[0041] a DC on-off circuit, the DC on-off circuit being connected to the voltage regulating circuit and the lamp, respectively, and configured to switch on the voltage regulating circuit and the lamp upon receiving the second signal;

[0042] An analog-to-digital conversion circuit is connected to the voltage regulating circuit and the control circuit respectively, and is used to perform analog-to-digital conversion on the voltage output by the voltage regulating circuit and transmit the converted voltage to the control circuit.

[0043] In some embodiments, the voltage regulating circuit includes:

[0044] a fifty-third resistor, a first end of the fifty-third resistor being connected to the control circuit to receive the voltage adjustment signal;

[0045] a twenty-ninth capacitor, wherein a first end of the twenty-ninth capacitor is connected to the second end of the fifty-third resistor, and a second end of the twenty-ninth capacitor is grounded;

[0046] a fifty-fourth resistor, a first end of the fifty-fourth resistor being connected to the second end of the fifty-third resistor;

[0047] a thirty-first capacitor, a first end of the thirty-first capacitor being connected to the second end of the fifty-fourth resistor, and a second end of the thirty-first capacitor being grounded;

[0048] an operational amplifier, a first input terminal of the operational amplifier being connected to the second terminal of the fifty-fourth resistor;

[0049] a fifty-sixth resistor, wherein a first end of the fifty-sixth resistor is connected to the second input terminal of the operational amplifier, and a second end of the fifty-sixth resistor is respectively connected to the negative power supply terminal and the ground terminal of the operational amplifier;

[0050] a fifty-seventh resistor, wherein a first end of the fifty-seventh resistor is connected to the second input end of the operational amplifier, and a second end of the fifty-seventh resistor is connected to the output end of the operational amplifier;

[0051] a fifty-second resistor, wherein a first end of the fifty-second resistor is connected to the voltage input terminal, and a second end of the fifty-second resistor is connected to the positive power supply terminal of the operational amplifier;

[0052] A twenty-eighth capacitor, wherein a first end of the twenty-eighth capacitor is connected to the second end of the fifty-second resistor, and a second end of the twenty-eighth capacitor is grounded.

[0053] In some embodiments, the DC on-off circuit comprises:

[0054] a twenty-first MOS transistor, wherein a first end of the twenty-first MOS transistor is connected to the voltage regulating circuit, and a control end of the twenty-first MOS transistor is connected to the control circuit to receive the second signal;

[0055] a first fuse, wherein a first end of the first fuse is connected to the second end of the twenty-first MOS tube, and a second end of the first fuse is connected to the lamp;

[0056] a seventh bidirectional diode, wherein a first end of the seventh bidirectional diode is connected to the second end of the first fuse, and a second end of the seventh bidirectional diode is grounded; and / or

[0057] The analog-to-digital conversion circuit comprises:

[0058] a 30th capacitor, a first end of the 30th capacitor being connected to the voltage regulating circuit, and a second end of the 30th capacitor being grounded;

[0059] a fifty-fifth resistor, wherein a first end of the fifty-fifth resistor is connected to the first end of the thirtieth capacitor, and a second end of the fifty-fifth resistor is connected to the control circuit;

[0060] a fifty-eighth resistor, wherein a first end of the fifty-eighth resistor is connected to the second end of the fifty-fifth resistor, and a second end of the fifty-eighth resistor is grounded;

[0061] A thirty-second capacitor is connected in parallel with the fifty-eighth resistor.

[0062] According to a second aspect of the present invention, a single-lamp controller is provided. The single-lamp controller includes the above-mentioned dimming circuit.

[0063] Compared with the existing technology, the dimming circuit and single-lamp controller of the present invention respectively control the PWM dimming circuit to perform PWM dimming on the lamp and the DC dimming circuit to perform DC dimming on the lamp through the control circuit, so that only one version of the controller needs to be produced during the production process, and there is no need to distinguish between controller versions, which can reduce production management costs; at the same time, one version of the controller can adapt to different power supplies. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 This is a module schematic diagram of a dimming circuit according to one embodiment of the present invention;

[0065] Figure 2 This is a circuit diagram of a PWM control circuit according to one embodiment of the present invention;

[0066] Figure 3 This is a circuit diagram of a PWM power supply voltage control circuit according to one embodiment of the present invention;

[0067] Figure 4 This is a circuit schematic diagram of a DC dimming circuit according to one embodiment of the present invention.

[0068] Explanation of the accompanying figures: PWM dimming circuit 100, PWM control circuit 110, PWM voltage receiving circuit 111, PWM signal receiving circuit 112, PWM on-off circuit 113, PWM power supply voltage control circuit 120, DC dimming circuit 200, voltage regulation circuit 210, DC on-off circuit 220, analog-to-digital conversion circuit 230, control circuit 300. DETAILED DESCRIPTION

[0069] The present invention will be further described in detail below with reference to the accompanying drawings.

[0070] The present invention provides a single lamp controller, which includes a dimming circuit for dimming the lamp 10. Figure 1 As shown, the dimming circuit includes a PWM dimming circuit 100, a DC dimming circuit 200 and a control circuit 300, wherein the PWM dimming circuit 100 is connected to the lamp 10, the DC dimming circuit 200 is connected to the lamp 10, and the control circuit 300 is connected to the PWM dimming circuit 100 and the DC dimming circuit 200 respectively. The control circuit 300 is used to output a first signal to the PWM dimming circuit 100 to perform PWM dimming on the lamp 10, or to output a second signal to the DC dimming circuit 200 to perform DC dimming on the lamp 10. Exemplarily, the control circuit 300 can be an EG800Kcat module.

[0071] like Figure 2 and Figure 3As shown, the PPWM dimming circuit 100 is used to perform PWM dimming on the lamp 10 when receiving the first signal; specifically, the PWM dimming circuit 100 includes a PWM control circuit 110 and a PWM power supply voltage control circuit 120, the PWM control circuit 110 is connected to the control circuit 300, wherein the control circuit 300 is also used to output a PWM signal, the PWM control circuit 110 is used to implement PWM dimming when receiving the PWM signal, and the PWM control circuit 110 is also used to perform PWM dimming on the lamp when receiving the first signal; the PWM power supply voltage control circuit 120 is respectively connected to the PWM control circuit 110 and the control circuit 300, wherein the control circuit 300 is also used to output a third signal, and the PWM power supply voltage control circuit 120 is used to adjust the voltage output to the PWM control circuit 110 when receiving the third signal.

[0072] In an optional embodiment, as Figure 2 As shown, the PWM control circuit 110 includes a PWM voltage receiving circuit 111, a PWM signal receiving circuit 112 and a PWM on-off circuit 113; the PWM voltage receiving circuit 111 is connected to the PWM power supply voltage control circuit 120, and the PWM voltage receiving circuit 111 receives the voltage output by the PWM power supply voltage control circuit 120; specifically, the PWM voltage receiving circuit 111 includes an eighth diode D8, a fifty-ninth resistor R59 and a sixtieth resistor R60, a first end (PWM-VCC) of the eighth diode D8 is connected to the PWM power supply voltage control circuit 120; a first end of the fifty-ninth resistor R59 is connected to the second end of the eighth diode D8; a first end of the sixtieth resistor R60 is connected to the second end of the fifty-ninth resistor R59, and a second end of the sixtieth resistor R60 is connected to the PWM signal receiving circuit 112.

[0073] In an optional embodiment, as Figure 2As shown, the PWM signal receiving circuit 112 is respectively connected to the PWM voltage receiving circuit 111 and the control circuit 300, and the PWM signal receiving circuit is used to implement PWM dimming when receiving the PWM signal; specifically, the PWM signal receiving circuit 112 includes an eleventh diode D11, a sixty-first resistor R61, a thirteenth transistor Q13 and a sixty-third resistor R63, a first end (PWM1) of the eleventh diode D11 is connected to the PWM1 end of the control circuit 300 to receive the PWM signal; a first end of the sixty-first resistor R61 is connected to the second end of the eleventh diode D11; a first end of the thirteenth transistor Q13 is connected to the second end of the sixtieth resistor R60 of the PWM voltage receiving circuit 111, a second end of the thirteenth transistor Q13 is grounded, and a control end of the thirteenth transistor Q13 is connected to the second end of the sixty-first resistor R61; a first end of the sixty-third resistor R63 is connected to the control end of the thirteenth transistor Q13, and a second end of the sixty-third resistor R63 is grounded.

[0074] In an optional embodiment, as Figure 2 As shown, the PWM on-off circuit 113 is connected to the PWM signal receiving circuit 112 and the lamp 10, respectively. The PWM on-off circuit 113 is used to turn on the PWM signal receiving circuit 112 and the lamp 10 when receiving a first signal. Specifically, the PWM on-off circuit 113 includes a 20th MOS transistor Q20 and a second fuse F2. The first end of the 20th MOS transistor Q20 is connected to the first end of the 13th transistor Q13 of the PWM signal receiving circuit 112, and the control end (PWM-CLT) of the 20th MOS transistor Q20 is connected to the PWM-CLT end of the control circuit 300 to receive the first signal. The first end of the second fuse F2 is connected to the second end of the 20th MOS transistor Q20, and the second end of the second fuse F2 is connected to the lamp 10.

[0075] In an optional embodiment, Figure 3As shown, the PWM power supply voltage control circuit 120 includes a twenty-second MOS transistor Q22, a nineteenth diode D19, a twenty-third MOS transistor Q23, and an eighteenth diode D18; wherein the third signal includes a fourth signal and a fifth signal, a first end of the twenty-second MOS transistor Q22 is connected to the voltage input terminal (VCC-12V-IN), a control terminal (12V-CLT) of the twenty-second MOS transistor Q22 is connected to the 12V-CLT terminal of the control circuit 300, and the twenty-second MOS transistor Q22 is configured to be turned on when receiving the fourth signal; a first end of the nineteenth diode D19 is connected to the second end of the twenty-second MOS transistor Q22, and a second end (PWM-VCC) of the nineteenth diode D19 is connected to the second end of the twenty-second MOS transistor Q22. ) is connected to the second end (PWM-VCC) of the eighth diode D8 of the PWM voltage receiving circuit 111 in the PWM control circuit 110 to provide a 12V voltage; a first end of the twenty-third MOS transistor Q23 is connected to the voltage input end, and a control end (5V-CLT) of the twenty-third MOS transistor Q23 is connected to the 5V-CLT end of the control circuit 300. The twenty-third MOS transistor Q23 is configured to be turned on when receiving the fifth signal; a first end of the eighteenth diode D18 is connected to the second end of the twenty-third MOS transistor Q23, and a second end of the eighteenth diode D18 is connected to the second end of the eighth diode D8 of the PWM voltage receiving circuit 111 in the PWM control circuit 110 to provide a 5V voltage.

[0076] like Figure 4 As shown, the DC dimming circuit 200 is used to perform DC dimming on the lamp 10 when receiving the second signal; specifically, the DC dimming circuit 200 includes a voltage regulating circuit 210, a DC on-off circuit 220 and an analog-to-digital conversion circuit 230.

[0077] In an optional embodiment, Figure 4As shown, the voltage regulating circuit 210 is connected to the control circuit 300, wherein the control circuit 300 is further used to output a voltage regulating signal, and the voltage regulating circuit 210 is used to adjust the output voltage when receiving the voltage regulating signal. Specifically, the voltage regulating circuit 210 includes a fifty-third resistor R53, a twenty-ninth capacitor C29, a fifty-fourth resistor R54, a thirty-first capacitor C31, an operational amplifier U5, a fifty-sixth resistor R56, a fifty-seventh resistor R57, a fifty-second resistor R52, and a twenty-eighth capacitor C28; a first end (PWM-DAC) of the fifty-third resistor R53 is connected to the PWM-DAC end of the control circuit 300 to receive the voltage regulating signal; a first end of the twenty-ninth capacitor C29 is connected to the second end of the fifty-third resistor R53, and the second end of the twenty-ninth capacitor C29 is grounded; a first end of the fifty-fourth resistor R54 is connected to the second end of the fifty-third resistor R53; a first end of the thirty-first capacitor C31 is connected to the first end of the fifty-sixth resistor R56, and a first end of the thirty-seventh capacitor C31 is connected to the first end of the fifty-sixth resistor R56. The second end of the fifty-fourth resistor R54 is connected, and the second end of the thirty-first capacitor C31 is grounded; the first input end of the operational amplifier U5 is connected to the second end of the fifty-fourth resistor R54; the first end of the fifty-sixth resistor R56 is connected to the second input end of the operational amplifier U5, and the second end of the fifty-sixth resistor R56 is respectively connected to the negative power supply terminal and the ground terminal of the operational amplifier U5; the first end of the fifty-seventh resistor R57 is connected to the second input end of the operational amplifier U5, and the second end of the fifty-seventh resistor R57 is connected to the output end of the operational amplifier U5; the first end of the fifty-second resistor R52 is connected to the voltage input end, and the second end of the fifty-second resistor R52 is connected to the positive power supply terminal of the operational amplifier U5; the first end of the twenty-eighth capacitor C28 is connected to the second end of the fifty-second resistor R52, and the second end of the twenty-eighth capacitor C28 is grounded, and the voltage range is configured between 0 and 12V through the voltage adjustment signal, and the voltage range corresponds to 0% to 100%.

[0078] In an optional embodiment, Figure 4 As shown, the DC on-off circuit 220 is respectively connected to the voltage regulating circuit 210 and the lamp 10. The DC on-off circuit 220 is used to turn on the voltage regulating circuit 210 and the lamp 10 when receiving the second signal. Specifically, the DC on-off circuit 220 includes a twenty-first MOS transistor Q21, a first fuse F1 and a seventh bidirectional diode D7. The first end of the twenty-first MOS transistor Q21 is connected to the output end of the operational amplifier U5 of the voltage regulating circuit 210, and the control end (DC-CLT) of the twenty-first MOS transistor Q21 is connected to the DC-CLT end of the control circuit 300 to receive the second signal; the first end of the first fuse F1 is connected to the second end of the twenty-first MOS transistor Q21, and the second end of the first fuse F1 is connected to the lamp 10; the first end of the seventh bidirectional diode D7 is connected to the second end of the first fuse F1, and the second end of the seventh bidirectional diode D7 is grounded.

[0079] In an optional embodiment, Figure 4 As shown, the analog-to-digital conversion circuit 230 is connected to the voltage regulation circuit 210 and the control circuit 300 respectively. The analog-to-digital conversion circuit 230 is used to perform analog-to-digital conversion on the voltage output by the voltage regulation circuit 210 and transmit the result to the control circuit 300. Specifically, the analog-to-digital conversion circuit 230 includes a 30th capacitor C30, a 55th resistor R55, a 58th resistor R58 and a 32nd capacitor C32. The first end of the 30th capacitor C30 is connected to the output end of the operational amplifier U5 of the voltage regulation circuit 210, and the second end of the 30th capacitor C30 is grounded; the first end of the 55th resistor R55 is connected to the first end of the 30th capacitor C30, and the second end (ADC1) of the 55th resistor R55 is connected to the ADC1 end of the control circuit 300; the first end of the 58th resistor R58 is connected to the second end of the 55th resistor R55, and the second end of the 58th resistor R58 is grounded; the 32nd capacitor C32 is connected in parallel with the 58th resistor R58.

[0080] It should be noted that the “first”, “second”, etc. in this embodiment are only for distinction and do not indicate the order.

[0081] The dimming circuit of this embodiment controls the PWM dimming circuit 100 to perform PWM dimming on the lamp 10 and the DC dimming circuit 200 to perform DC dimming on the lamp 10 through the control circuit 300, so that only one version of the controller needs to be produced during the production process, and there is no need to distinguish between controller versions, which can reduce production management costs; at the same time, one version of the controller can adapt to different power supplies.

[0082] The above descriptions are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A dimming circuit for dimming a lamp, characterized in that: include: a PWM dimming circuit, the PWM dimming circuit being connected to the lamp, and configured to perform PWM dimming on the lamp upon receiving a first signal; a DC dimming circuit, the DC dimming circuit being connected to the lamp, and configured to perform DC dimming on the lamp upon receiving a second signal; A control circuit is connected to the PWM dimming circuit and the DC dimming circuit respectively, and is used to output a first signal to the PWM dimming circuit to perform PWM dimming on the lamp, or to output a second signal to the DC dimming circuit to perform DC dimming on the lamp.

2. The dimming circuit according to claim 1, wherein: The PWM dimming circuit includes: a PWM control circuit, the PWM control circuit being connected to the control circuit, the PWM control circuit being further configured to implement PWM dimming upon receiving a PWM signal, the PWM control circuit being configured to perform PWM dimming on the lamp upon receiving the first signal; Wherein, the control circuit is further configured to output the PWM signal.

3. The dimming circuit according to claim 2, wherein: The PWM dimming circuit further includes: a PWM power supply voltage control circuit, the PWM power supply voltage control circuit being connected to the PWM control circuit and the control circuit respectively, the PWM power supply voltage control circuit being configured to adjust a voltage output to the PWM control circuit upon receiving a third signal; Wherein, the control circuit is further configured to output the third signal.

4. The dimming circuit according to claim 3, characterized in that: The PWM power supply voltage control circuit includes: a twenty-second MOS transistor, wherein a first end of the twenty-second MOS transistor is connected to the voltage input end, a control end of the twenty-second MOS transistor is connected to the control circuit, and the twenty-second MOS transistor is configured to be turned on upon receiving a fourth signal; a nineteenth diode, wherein a first end of the nineteenth diode is connected to the second end of the twenty-second MOS transistor, and a second end of the nineteenth diode is connected to the PWM control circuit; a twenty-third MOS transistor, wherein a first end of the twenty-third MOS transistor is connected to the voltage input end, a control end of the twenty-third MOS transistor is connected to the control circuit, and the twenty-third MOS transistor is configured to be turned on upon receiving a fifth signal; an eighteenth diode, a first end of the eighteenth diode being connected to the second end of the twenty-third MOS transistor, and a second end of the eighteenth diode being connected to the PWM control circuit; The third signal includes a fourth signal and a fifth signal.

5. The dimming circuit according to claim 3, wherein: The PWM control circuit includes: a PWM voltage receiving circuit, the PWM voltage receiving circuit being connected to the PWM power supply voltage control circuit, and receiving the voltage output by the PWM power supply voltage control circuit; a PWM signal receiving circuit, the PWM signal receiving circuit being connected to the PWM voltage receiving circuit and the control circuit respectively, and the PWM signal receiving circuit being used to implement PWM dimming when receiving the PWM signal; A PWM on-off circuit is connected to the PWM signal receiving circuit and the lamp respectively, and is used to turn on the PWM signal receiving circuit and the lamp when receiving the first signal.

6. The dimming circuit according to claim 5, characterized in that: The PWM voltage receiving circuit includes: an eighth diode, a first end of the eighth diode being connected to the PWM power supply voltage control circuit; a fifty-ninth resistor, a first end of the fifty-ninth resistor being connected to the second end of the eighth diode; a sixtieth resistor, wherein a first end of the sixtieth resistor is connected to a second end of the fifty-ninth resistor, and a second end of the sixtieth resistor is connected to the PWM signal receiving circuit; and / or The PWM signal receiving circuit includes: an eleventh diode, a first end of the eleventh diode being connected to the control circuit to receive the PWM signal; a sixty-first resistor, a first end of the sixty-first resistor being connected to the second end of the eleventh diode; a thirteenth transistor, wherein a first end of the thirteenth transistor is connected to the PWM voltage receiving circuit, a second end of the thirteenth transistor is grounded, and a control end of the thirteenth transistor is connected to the second end of the sixty-first resistor; a sixty-third resistor, wherein a first end of the sixty-third resistor is connected to the control end of the thirteenth transistor, and a second end of the sixty-third resistor is grounded; and / or The PWM on-off circuit comprises: a 20th MOS transistor, wherein a first end of the 20th MOS transistor is connected to the PWM signal receiving circuit, and a control end of the 20th MOS transistor is connected to the control circuit to receive the first signal; A second fuse, wherein a first end of the second fuse is connected to the second end of the twentieth MOS tube, and a second end of the second fuse is connected to the lamp.

7. The dimming circuit according to any one of claims 1 to 6, characterized in that: The DC dimming circuit includes: a voltage regulating circuit, the voltage regulating circuit being connected to the control circuit, the voltage regulating circuit being configured to regulate an output voltage upon receiving a voltage regulating signal, wherein the control circuit is further configured to output the voltage regulating signal; a DC on-off circuit, the DC on-off circuit being connected to the voltage regulating circuit and the lamp, respectively, and configured to switch on the voltage regulating circuit and the lamp upon receiving the second signal; An analog-to-digital conversion circuit is connected to the voltage regulating circuit and the control circuit respectively, and is used to perform analog-to-digital conversion on the voltage output by the voltage regulating circuit and transmit the converted voltage to the control circuit.

8. The dimming circuit according to claim 7, characterized in that: The voltage regulating circuit comprises: a fifty-third resistor, a first end of the fifty-third resistor being connected to the control circuit to receive the voltage adjustment signal; a twenty-ninth capacitor, wherein a first end of the twenty-ninth capacitor is connected to the second end of the fifty-third resistor, and a second end of the twenty-ninth capacitor is grounded; a fifty-fourth resistor, a first end of the fifty-fourth resistor being connected to the second end of the fifty-third resistor; a thirty-first capacitor, a first end of the thirty-first capacitor being connected to the second end of the fifty-fourth resistor, and a second end of the thirty-first capacitor being grounded; an operational amplifier, a first input terminal of the operational amplifier being connected to the second terminal of the fifty-fourth resistor; a fifty-sixth resistor, wherein a first end of the fifty-sixth resistor is connected to the second input terminal of the operational amplifier, and a second end of the fifty-sixth resistor is respectively connected to the negative power supply terminal and the ground terminal of the operational amplifier; a fifty-seventh resistor, wherein a first end of the fifty-seventh resistor is connected to the second input end of the operational amplifier, and a second end of the fifty-seventh resistor is connected to the output end of the operational amplifier; a fifty-second resistor, wherein a first end of the fifty-second resistor is connected to the voltage input terminal, and a second end of the fifty-second resistor is connected to the positive power supply terminal of the operational amplifier; A twenty-eighth capacitor, wherein a first end of the twenty-eighth capacitor is connected to the second end of the fifty-second resistor, and a second end of the twenty-eighth capacitor is grounded.

9. The dimming circuit according to claim 7, wherein: The DC on-off circuit comprises: a twenty-first MOS transistor, wherein a first end of the twenty-first MOS transistor is connected to the voltage regulating circuit, and a control end of the twenty-first MOS transistor is connected to the control circuit to receive the second signal; a first fuse, wherein a first end of the first fuse is connected to the second end of the twenty-first MOS tube, and a second end of the first fuse is connected to the lamp; a seventh bidirectional diode, wherein a first end of the seventh bidirectional diode is connected to the second end of the first fuse, and a second end of the seventh bidirectional diode is grounded; and / or The analog-to-digital conversion circuit comprises: a 30th capacitor, a first end of the 30th capacitor being connected to the voltage regulating circuit, and a second end of the 30th capacitor being grounded; a fifty-fifth resistor, wherein a first end of the fifty-fifth resistor is connected to the first end of the thirtieth capacitor, and a second end of the fifty-fifth resistor is connected to the control circuit; a fifty-eighth resistor, wherein a first end of the fifty-eighth resistor is connected to the second end of the fifty-fifth resistor, and a second end of the fifty-eighth resistor is grounded; A thirty-second capacitor is connected in parallel with the fifty-eighth resistor.

10. A single lamp controller, characterized in that: The dimming circuit comprises the dimming circuit according to any one of claims 1 to 9.

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