Double-head lamp control circuit and double-head lamp

Abstract

The utility model discloses a double-head lamp control circuit and a double-head lamp. The double-head lamp control circuit comprises a main control module, a magnetic induction module, a first lamp control module and a second lamp control module, and the first lamp control module and the second lamp control module can correspond to two lamp heads of a double-head lamp respectively. The brightness adjusting signal and the color temperature adjusting signal output by the main control module are used for controlling the brightness and the color temperature of each lamp control module at the same time, more light effects can be achieved, and therefore the user requirements can be better met. And meanwhile, the magnetic induction signal for indicating the folding or unfolding state of the double-head lamp is provided for the main control module, so that the working modes of the double-head lamp can be switched in different use states.

Description

Technical Field

[0001] The embodiments of the present utility model relate to the technical field of LED control, and in particular, to a control circuit and a double-headed lamp for a double-headed lamp. Background Art

[0002] With the increasing richness of people's work and life scenarios, the requirements for the use of lamps are getting higher and higher, and people are gradually no longer satisfied with products that only have a single type of light. For this reason, a variety of designs have emerged.

[0003] The prior art discloses a mode switching circuit for a folding lamp and its folding lamp, and specifically discloses that "a signal processing unit receives the electrical signal sent by the magnetic induction unit and sends a signal to turn on or off the first switch unit and the second switch unit to drive the first switch unit and the second switch unit to turn on or off; the first switch unit receives the signal sent by the signal processing unit and is used to turn on or off the first LED lighting unit according to the signal sent by the received signal processing unit; the second switch unit receives the signal sent by the signal processing unit and is used to turn on or off the second LED lighting unit according to the signal sent by the received signal processing unit; the first LED lighting unit is connected to the first switch unit; the second LED lighting unit is connected to the second switch unit".

[0004] In the above prior art, only the on / off of the first switch unit and the second switch unit can be controlled by the signal processing unit to control whether the first LED lighting unit and the second LED lighting unit emit light. The lighting effects that can be achieved are very few and cannot well meet people's needs. Summary of the Utility Model

[0005] The embodiments of the present utility model provide a control circuit and a double-headed lamp for a double-headed lamp to solve the problem that the lighting effects that can be achieved by lamp products in the prior art are fewer.

[0006] In a first aspect, the embodiments of the present utility model provide a control circuit for a double-headed lamp, and the control circuit for the double-headed lamp includes: a main control module, a magnetic induction module, a first lamp control module, and a second lamp control module; wherein,

[0007] The main control module is used to receive the magnetic induction signal sent by the magnetic induction module and output a brightness adjustment signal and a color temperature adjustment signal; the magnetic induction signal is used to indicate the folded or unfolded state of the double-headed lamp;

[0008] The first lamp control module includes a first brightness adjustment sub-module, a first color temperature adjustment sub-module, and a first light-emitting sub-module; the first brightness adjustment sub-module is configured to adjust the brightness of the first light-emitting sub-module according to the brightness adjustment signal, and the first color temperature adjustment sub-module is configured to adjust the color temperature of the first light-emitting sub-module according to the color temperature adjustment signal;

[0009] The second lamp control module includes a second brightness adjustment sub-module, a second color temperature adjustment sub-module, and a second light-emitting sub-module; the second brightness adjustment sub-module is configured to adjust the brightness of the second light-emitting sub-module according to the brightness adjustment signal, and the second color temperature adjustment sub-module is configured to adjust the color temperature of the second light-emitting sub-module according to the color temperature adjustment signal.

[0010] Optionally, the brightness adjustment signal includes a first brightness adjustment signal and a second brightness adjustment signal; the first brightness adjustment sub-module is specifically configured to adjust the brightness of the first light-emitting sub-module according to the first brightness adjustment signal, and the second brightness adjustment sub-module is specifically configured to adjust the brightness of the second light-emitting sub-module according to the second brightness adjustment signal;

[0011] There are multiple color temperature adjustment signals. The first light-emitting sub-module includes multiple first LED light-emitting units, and the second light-emitting sub-module includes multiple second LED light-emitting units. The number of the first LED light-emitting units and the second LED light-emitting units is the same as that of the color temperature adjustment signals; the first color temperature adjustment sub-module is specifically configured to respectively control the on / off of the corresponding first LED light-emitting units according to each of the color temperature adjustment signals; the second color temperature adjustment sub-module is specifically configured to respectively control the on / off of the corresponding second LED light-emitting units according to each of the color temperature adjustment signals.

[0012] Optionally, the first brightness adjustment sub-module includes a first driving unit and a first switching unit; the first color temperature adjustment sub-module includes multiple second switching units, which correspond to the first LED light-emitting units one by one; each of the first LED light-emitting units is connected to the first switching unit and the corresponding second switching unit; the first driving unit is configured to receive the first brightness adjustment signal and send a control signal to the first switching unit to control the on / off of the first switching unit; each of the color temperature adjustment signals is respectively used to control the on / off of the corresponding second switching unit;

[0013] The second brightness adjustment sub-module includes a second driving unit and a third switching unit; the second color temperature adjustment sub-module includes a plurality of fourth switching units, which correspond to the second LED light-emitting units one by one; each of the second LED light-emitting units is connected to the third switching unit and the corresponding fourth switching unit; the second driving unit is configured to receive the second brightness adjustment signal and send a control signal to the third switching unit to control the on / off of the third switching unit; each of the color temperature adjustment signals is respectively used to control the on / off of the corresponding fourth switching unit.

[0014] Optionally, one of the second switching units includes an NPN transistor Q1 and a PMOS transistor T1; the emitter of the NPN transistor Q1 is grounded, the collector of the NPN transistor Q1 is connected to the gate of the PMOS transistor T1, and the base of the NPN transistor Q1 receives the corresponding color temperature adjustment signal; the source of the PMOS transistor T1 is connected to the lamp control power supply terminal, and the drain of the PMOS transistor T1 is connected to the input terminal of the corresponding first LED light-emitting unit; the output terminal of the corresponding first LED light-emitting unit is connected to the first switching unit and then grounded.

[0015] Optionally, the first switching unit includes an NMOS transistor Q5, and the first driving unit includes an LED driving chip; the dimming control pin of the LED driving chip receives the first brightness adjustment signal, and the driving output pin of the LED driving chip is connected to the gate of the NMOS transistor Q5; the drain of the NMOS transistor Q5 is connected to the output terminals of all the first LED light-emitting units, and the source of the NMOS transistor Q5 is grounded.

[0016] Optionally, the LED driving chip is an MT7200B chip U4, the ADJ pin of the MT7200B chip U4 receives the first brightness adjustment signal, the DVR pin is connected to the gate of the NMOS transistor Q5, the VIN pin is connected to the lamp control power supply terminal, the IS pin is connected to the VIN pin through a resistor, the VIN pin is grounded through a capacitor, and the VCC pin is grounded through a capacitor.

[0017] Optionally, the source of the PMOS transistor T1 is connected to the lamp control power supply terminal through the first coil of a common-mode inductor L4, and the output terminal of the first LED light-emitting unit is connected to the first switching unit through the second coil of the common-mode inductor L4.

[0018] Optionally, the second coil of the common-mode inductor L4 is connected to the first switching unit through an inductor L3 and a resistor L1.

[0019] Optionally, the main control module is connected with a switch button, a color temperature button and a dimming button; the switch button is used for sending a switch control signal to the main control module, the color temperature button is used for sending a color temperature control signal to the main control module, and the dimming button is used for sending a dimming control signal to the main control module.

[0020] In a second aspect, an embodiment of the present invention further provides a dual-head lamp, which includes the dual-head lamp control circuit provided in any embodiment of the present invention.

[0021] An embodiment of the present invention provides a dual-head lamp control circuit, which includes a main control module, a magnetic induction module, a first lamp control module and a second lamp control module. The first lamp control module and the second lamp control module can respectively correspond to the two lamp heads of the dual-head lamp. By using the brightness adjustment signal and the color temperature adjustment signal output by the main control module to simultaneously control the brightness and color temperature of each lamp control module, more lighting effects can be achieved, so as to better meet the user's needs. At the same time, by providing a magnetic induction signal for indicating the folded or unfolded state of the dual-head lamp to the main control module, the switching of the working mode of the dual-head lamp in different usage states can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the dual-head lamp control circuit provided in Embodiment 1 of the present invention;

[0023] Figure 2 It is a schematic circuit diagram of the magnetic induction module provided in Embodiment 1 of the present invention;

[0024] Figure 3 It is a schematic circuit diagram of the main control module provided in Embodiment 1 of the present invention;

[0025] Figure 4 It is a schematic structural diagram of another dual-head lamp control circuit provided in Embodiment 1 of the present invention;

[0026] Figure 5 It is a schematic circuit diagram of the first lamp control module provided in Embodiment 1 of the present invention;

[0027] Figure 6 It is a schematic circuit diagram of the second lamp control module provided in Embodiment 1 of the present invention;

[0028] Figure 7 It is a schematic circuit diagram of the power adapter module provided in Embodiment 1 of the present invention;

[0029] Figure 8 It is a schematic circuit diagram of the voltage conversion module provided in Embodiment 1 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0031] Embodiment 1

[0032] Figure 1 As shown in the structural schematic diagram of the dual-head lamp control circuit provided in Embodiment 1 of the present utility model, this embodiment is applicable to the situation of controlling a dual-head lamp so that a user can use the required lighting effects in different scenarios. Figure 1 As shown in the figure, the dual-head lamp control circuit includes: a main control module 100, a magnetic induction module 400, a first lamp control module 200, and a second lamp control module 300; wherein, the main control module 100 is configured to receive the magnetic induction signal sent by the magnetic induction module 400, and output a brightness adjustment signal and a color temperature adjustment signal; the magnetic induction signal is used to indicate the folded or unfolded state of the dual-head lamp; the first lamp control module 200 includes a first brightness adjustment sub-module 210, a first color temperature adjustment sub-module 220, and a first light-emitting sub-module 230; the first brightness adjustment sub-module 210 is configured to adjust the brightness of the first light-emitting sub-module 230 according to the brightness adjustment signal, and the first color temperature adjustment sub-module 220 is configured to adjust the color temperature of the first light-emitting sub-module 230 according to the color temperature adjustment signal; the second lamp control module 300 includes a second brightness adjustment sub-module 310, a second color temperature adjustment sub-module 320, and a second light-emitting sub-module 330; the second brightness adjustment sub-module 310 is configured to adjust the brightness of the second light-emitting sub-module 330 according to the brightness adjustment signal, and the second color temperature adjustment sub-module 320 is configured to adjust the color temperature of the second light-emitting sub-module 330 according to the color temperature adjustment signal.

[0033] Specifically, the dual-head lamp may include an inner lamp head and an outer lamp head, and may respectively correspond to the first lamp control module 200 and the second lamp control module 300. Further, the inner lamp head and the outer lamp head may be foldably connected, and the magnetic induction module 400 may be disposed at one of the lamp head positions, and then a magnet may be disposed at the corresponding position of the other lamp head. Then, when the outer lamp head is flipped and folded close to the inner lamp head, the magnetic induction module 400 may generate a magnetic induction signal indicating that the use state of the dual-head lamp is in the folded state and send it to the main control module 100. When the outer lamp head is away from the inner lamp head, the magnetic induction module 400 may generate a magnetic induction signal indicating that the use state of the dual-head lamp is in the unfolded state and send it to the main control module 100. Among them, as Figure 2As shown, the magnetic induction module 400 may include a Hall switch U6 (CH4513 can be selected), and can be powered by a 5V DC power supply. The 5V DC power supply can be grounded through the parallel-connected C14 and C16. The Hall switch U6 can be connected to the magnetic induction signal output terminal K1 through the resistor R24.

[0034] As Figure 3 shown, in the main control module 100, the main control chip U2 can be selected as GH8RF892B. The KEY0 / AN13 / RB0 pins and the KEY1 / AN12 / RB1 pins are used as the reserved programming points on the PCBA board, and can access the corresponding SDA and SCL signals through the connector 3. The VDD pin can access the supply voltage through the connector 3, and can be grounded through the parallel-connected capacitor C1 and capacitor C2. The GND pin is grounded, and the CAP / AN7 / RB6 pin is grounded through the capacitor C15. Then, pins can be specified from the RA2 / AN2 pin, RA3 / AN3 pin, RA4 / AN4 pin, RA5 / AN5 pin, and RB7 / AN6 pin to output the brightness adjustment signal and the color temperature adjustment signal and receive the magnetic induction signal sent by the magnetic induction module 400. Exemplarily, the magnetic induction signal output terminal K1 can be connected to the RA3 / AN3 pin of the main control module 100. Subsequently, the main control module 100 can send the brightness adjustment signal to the first brightness adjustment sub-module 210 and the second brightness adjustment sub-module 310. The first brightness adjustment sub-module 210 is connected to the first light-emitting sub-module 230, and the second brightness adjustment sub-module 310 is connected to the second light-emitting sub-module 330, so that the brightness adjustment of the two light-emitting sub-modules can be realized. The main control module 100 can also send the color temperature adjustment signal to the first color temperature adjustment sub-module 220 and the second color temperature adjustment sub-module 320. The first color temperature adjustment sub-module 220 is connected to the first light-emitting sub-module 230, and the second color temperature adjustment sub-module 320 is connected to the second light-emitting sub-module 330, so that the color temperature adjustment of the two light-emitting sub-modules can be realized.

[0035] Optionally, the brightness adjustment signal includes a first brightness adjustment signal and a second brightness adjustment signal. The first brightness adjustment sub-module 210 is specifically configured to adjust the brightness of the first light-emitting sub-module 230 according to the first brightness adjustment signal, and the second brightness adjustment sub-module 310 is specifically configured to adjust the brightness of the second light-emitting sub-module 330 according to the second brightness adjustment signal. There are multiple color temperature adjustment signals. The first light-emitting sub-module 230 includes multiple first LED light-emitting units, and the second light-emitting sub-module 330 includes multiple second LED light-emitting units. The number of the first LED light-emitting units and the second LED light-emitting units is the same as that of the color temperature adjustment signals. The first color temperature adjustment sub-module 220 is specifically configured to adjust the on / off of the corresponding first LED light-emitting units respectively according to each of the color temperature adjustment signals. The second color temperature adjustment sub-module 320 is specifically configured to adjust the on / off of the corresponding second LED light-emitting units respectively according to each of the color temperature adjustment signals.

[0036] Specifically, as Figure 3 shown, taking the example of including two color temperature adjustment signals, in the main control module 100, the RA2 / AN2 pin can be selected to output the first color temperature adjustment signal W-LED, the RA4 / AN4 pin can be selected to output the second color temperature adjustment signal Y-LED, the RA5 / AN5 pin can be selected to output the first brightness adjustment signal PWM1, and the RB7 / AN6 pin can be selected to output the second brightness adjustment signal PWM2. Then, two brightness adjustment signals can be used to adjust the brightness of the two light-emitting sub-modules respectively, so that different brightnesses of the two lamp control modules can be achieved. Each of the first LED light-emitting units and the second LED light-emitting units can include multiple light-emitting diodes connected in series. The color temperatures among the multiple first LED light-emitting units are different, and the color temperatures among the multiple second LED light-emitting units are different. Thus, the color temperature adjustment of the first light-emitting sub-module 230 can be realized through the bright / dark combination among the multiple first LED light-emitting units, and the color temperature adjustment of the second light-emitting sub-module 330 can be realized through the bright / dark combination among the multiple second LED light-emitting units. Then, each of the color temperature adjustment signals can be used to adjust the on / off of the corresponding first LED light-emitting units and the corresponding second LED light-emitting units respectively, so as to achieve different bright / dark combinations. At the same time, the same set of color temperature adjustment signals can be used to adjust the color temperatures of the two light-emitting sub-modules, and different colors of the two lamp control modules can be realized by using LED light-emitting units with different color temperatures.

[0037] Further optionally, as Figure 4 shown, the first brightness adjustment sub-module 210 includes a first driving unit 211 and a first switching unit 212; the first color temperature adjustment sub-module 220 includes multiple second switching units 221( Figure 4Taking two as examples for illustration in the figure), and corresponding to the first LED light-emitting units 231 one by one; each of the first LED light-emitting units 231 is connected to the first switch unit 212 and the corresponding second switch unit 221; the first driving unit 211 is configured to receive the first brightness adjustment signal and send a control signal to the first switch unit 212 to control the on / off of the first switch unit 212; each of the color temperature adjustment signals is respectively used to control the on / off of the corresponding second switch unit 221; the second brightness adjustment sub-module 310 includes a second driving unit 311 and a third switch unit 312; the second color temperature adjustment sub-module 320 includes a plurality of fourth switch units 321( Figure 4 Taking two as examples for illustration in the figure), and corresponding to the second LED light-emitting units 331 one by one; each of the second LED light-emitting units 331 is connected to the third switch unit 312 and the corresponding fourth switch unit 321; the second driving unit 311 is configured to receive the second brightness adjustment signal and send a control signal to the third switch unit 312 to control the on / off of the third switch unit 312; each of the color temperature adjustment signals is respectively used to control the on / off of the corresponding fourth switch unit 321.

[0038] Specifically, in the first lamp control module 200, each of the first LED light-emitting units 231 is connected to the first switch unit 212 and the corresponding second switch unit 221, so that the brightness of the corresponding first LED light-emitting unit 231 can be controlled by controlling the on / off of the first switch unit 212 and the corresponding second switch unit 221. The first driving unit 211 can adjust the output current through the input first brightness adjustment signal (specifically, it can be a PWM signal) to achieve the on / off control of the first switch unit 212, thereby realizing brightness adjustment. Each of the color temperature adjustment signals output by the main control module 100 can directly control the on / off of the corresponding second switch unit 221.

[0039] In the second lamp control module 300, each of the second LED light-emitting units 331 is connected to the third switch unit 312 and the corresponding fourth switch unit 321, so that the brightness of the corresponding second LED light-emitting unit 331 can be controlled by controlling the on / off of the third switch unit 312 and the corresponding fourth switch unit 321. The second driving unit 311 can adjust the output current through the input second brightness adjustment signal (specifically, it can be a PWM signal) to achieve the on / off control of the third switch unit 312, thereby realizing brightness adjustment. Each of the color temperature adjustment signals output by the main control module 100 can directly control the on / off of the corresponding fourth switch unit 321.

[0040] Optionally, the main control module 100 is connected with a switch button, a color temperature button and a dimming button; the switch button is used to send a switch control signal to the main control module 100, the color temperature button is used to send a color temperature control signal to the main control module 100, and the dimming button is used to send a dimming control signal to the main control module 100. Specifically, as Figure 3 shown, the switch button, the color temperature button and the dimming button can be connected to the KEY2 / AN11 / RB2 pin, the KEY3 / AN10 / RB3 pin and the KEY4 / AN9 / RB4 pin of the main control module 100 through the resistor RN1. Then, the main control module 100 can specifically output different brightness adjustment signals and color temperature adjustment signals according to the switch control signal, the color temperature control signal, the dimming control signal and the magnetic induction signal. Further, the RA0 / AN0 / KEY12 pin of the main control module 100 can be connected to the switch indicator LED1, the RA1 / AN1 / KEY11 pin can be connected to the color temperature indicator LED2, and the AN8 / RB5 pin can be connected to the dimming indicator LED3, so that the current switch state, color temperature state and brightness state can be indicated by the switch indicator LED1, the color temperature indicator LED2 and the dimming indicator LED3 respectively.

[0041] Exemplarily, when the outer lamp head is flipped and folded and closed with the inner lamp head, the Hall switch U6 is turned on, and the magnetic induction signal output terminal K1 is pulled low and fed back to the main control module 100. Accordingly, it can be exemplarily realized that the single-point switch button is for on / off operation, short pressing the color temperature button can realize the cyclic switching of three color temperatures of 2700K - 4000K - 5500K, short pressing the dimming button can realize the cyclic switching of three brightness levels of 20% - 60% - 100%, long pressing the dimming button can realize the stepless adjustment of 20% - 100%, and flipping and folding the outer lamp head and closing it with the inner lamp head can realize reducing the power of the outer lamp head, etc.

[0042] Based on the above technical solution, optionally, as Figure 5As shown, one of the second switch units 221 includes an NPN transistor Q1 (selectable 2SC1623) and a PMOS transistor T1 (selectable GL8P06); the emitter of the NPN transistor Q1 is grounded, the collector of the NPN transistor Q1 is connected to the gate of the PMOS transistor T1, and the base of the NPN transistor Q1 is connected to the corresponding color temperature adjustment signal (W-LED); the source of the PMOS transistor T1 is connected to the lamp control power supply terminal, and the drain of the PMOS transistor T1 is connected to the input terminal of the corresponding first LED lighting unit 231; the output terminal of the corresponding first LED lighting unit 231 is connected to the first switch unit 212 and then grounded. Among them, the lamp control power supply terminal can be a 36V DC power supply. A resistor R19 can be connected between the emitter and the base of the NPN transistor Q1, a resistor R20 can be connected between the base of the NPN transistor Q1 and the color temperature adjustment signal access terminal, a resistor R21 can be connected between the collector of the NPN transistor Q1 and the gate of the PMOS transistor T1, and a resistor R22 can be connected between the source and the gate of the PMOS transistor T1.

[0043] Further optionally, as Figure 5 shown, the first switch unit 212 includes an NMOS transistor Q5, and the first driving unit 211 includes an LED driving chip; the dimming control pin of the LED driving chip is connected to the first brightness adjustment signal, and the driving output pin of the LED driving chip is connected to the gate of the NMOS transistor Q5; the drain of the NMOS transistor Q5 is connected to the output terminals of each of the first LED lighting units 231, and the source of the NMOS transistor Q5 is grounded.

[0044] Further optionally, as Figure 5 shown, the LED driving chip is an MT7200B chip U4 (a step-down constant current driving chip in continuous conduction mode). The ADJ pin (i.e., the dimming control pin) of the MT7200B chip U4 is connected to the first brightness adjustment signal, the DVR pin (i.e., the driving output pin) is connected to the gate of the NMOS transistor Q5, the VIN pin is connected to the lamp control power supply terminal, the IS pin is connected to the VIN pin through a resistor, the VIN pin is grounded through a capacitor, and the VCC pin is grounded through a capacitor. Among them, a resistor R5 can be connected between the ADJ pin and the first brightness adjustment signal access terminal, the ADJ pin can also be grounded through a parallel-connected capacitor C17 and resistor R6, the GND pin is grounded, the DVR pin can be connected to the gate of the NMOS transistor Q5 through a resistor R10, the VIN pin can be grounded through a capacitor C24, the VCC pin can be grounded through a capacitor C23, the IS pin can be connected to the VIN pin through a parallel-connected resistor R3 and resistor R4, the VIN pin can be connected to the lamp control power supply terminal through a diode D1, and can be grounded through a parallel-connected electrolytic capacitor EC1 and capacitor C5.

[0045] Further optionally, as Figure 5 shown, the source electrode of the PMOS transistor T1 is connected to the lamp control power supply terminal through the first coil of the common mode inductor L4, and the output terminal of the first LED lighting unit 231 is connected to the first switching unit 212 through the second coil of the common mode inductor L4. Specifically, the first coil of the common mode inductor L4 can be connected between the parallel-connected resistors R3 and R4 and the IS pin of the MT7200B chip U4.

[0046] Further optionally, as Figure 5 shown, the second coil of the common mode inductor L4 is connected to the first switching unit 212 through the inductor L3 and the resistor L1. Specifically, the resistor L1 can be connected to the drain electrode of the NMOS transistor Q5. A capacitor C11 and a capacitor C19 can be connected in series between the second coil of the common mode inductor L4 and the drain electrode of the NMOS transistor Q5, and the ground is connected between the capacitor C11 and the capacitor C19. A parallel-connected electrolytic capacitor EC3 and a capacitor C13 can also be connected between the first coil and the second coil of the common mode inductor L4. A parallel-connected diode D3 and a capacitor C22 can also be connected between the resistor L1 and the drain electrode of the NMOS transistor Q5 to the VIN pin of the MT7200B chip U4.

[0047] Based on the above technical solution, for other second switching units 221 and the corresponding first LED lighting units 231, they can be connected in parallel with the above-mentioned second switching units 221 and the corresponding first LED lighting units 231. More lighting effects can be obtained by connecting more groups in parallel. Exemplarily, as Figure 5 shown, another second switching unit 221 includes an NPN transistor Q3 (selectable 2SC1623) and a PMOS transistor T3 (selectable GL8P06); the emitter of the NPN transistor Q3 is grounded, the collector of the NPN transistor Q3 is connected to the gate of the PMOS transistor T3, and the base of the NPN transistor Q3 is connected to the corresponding color temperature adjustment signal (Y-LED); the source electrode of the PMOS transistor T3 is connected to the source electrode of the PMOS transistor T1, and the drain electrode of the PMOS transistor T3 is connected to the input terminal of the corresponding first LED lighting unit 231; the output terminal of the corresponding first LED lighting unit 231 is connected to the output terminals of other first LED lighting units 231. Specifically, a resistor R23 can be connected between the emitter and the base of the NPN transistor Q3, a resistor R11 can be connected between the base of the NPN transistor Q3 and the color temperature adjustment signal access terminal, a resistor R25 can be connected between the collector of the NPN transistor Q3 and the gate of the PMOS transistor T3, and a resistor R26 can be connected between the source electrode and the gate of the PMOS transistor T3.

[0048] Similarly, as Figure 6As shown, one of the fourth switch units 321 includes an NPN transistor Q2 (such as 2SC1623 can be selected) and a PMOS transistor T2 (such as GL8P06 can be selected); the emitter of the NPN transistor Q2 is grounded, the collector of the NPN transistor Q2 is connected to the gate of the PMOS transistor T2, and the base of the NPN transistor Q2 is connected to the corresponding color temperature adjustment signal (W-LED); the source of the PMOS transistor T2 is connected to the lamp control power supply terminal, and the drain of the PMOS transistor T2 is connected to the input terminal of the corresponding second LED light-emitting unit 331; the output terminal of the corresponding second LED light-emitting unit 331 is connected to the third switch unit 312 and then grounded. Among them, a resistor R13 can be connected between the collector of the NPN transistor Q2 and the gate of the PMOS transistor T2, and a resistor R14 can be connected between the source and the gate of the PMOS transistor T2.

[0049] Further, as Figure 6 shown, the third switch unit 312 includes an NMOS transistor Q6, and the second driving unit 311 includes an LED driving chip; the dimming control pin of the LED driving chip is connected to the second brightness adjustment signal, and the driving output pin of the LED driving chip is connected to the gate of the NMOS transistor Q6; the drain of the NMOS transistor Q6 is connected to the output terminals of the respective second LED light-emitting units 331, and the source of the NMOS transistor Q6 is grounded.

[0050] Further, as Figure 6 shown, the LED driving chip in the second driving unit 311 is an MT7200B chip U3. The ADJ pin (i.e., the dimming control pin) of the MT7200B chip U3 is connected to the second brightness adjustment signal, the DVR pin (i.e., the driving output pin) is connected to the gate of the NMOS transistor Q6, the VIN pin is connected to the lamp control power supply terminal, the VIN pin is grounded through a capacitor, and the VCC pin is grounded through a capacitor. Among them, a resistor R9 can be connected between the ADJ pin and the second brightness adjustment signal input terminal, the ADJ pin can also be grounded through a parallel-connected capacitor C18 and resistor R15, the GND pin is grounded, the DVR pin can be connected to the gate of the NMOS transistor Q6 through a resistor R12, the VIN pin can be grounded through a capacitor C26, the VCC pin can be grounded through a capacitor C25, the VIN pin can be connected to the lamp control power supply terminal through a diode D2, and can be grounded through a parallel-connected electrolytic capacitor EC2 and capacitor C6.

[0051] Further, as Figure 6 shown, the source of the PMOS transistor T2 is connected to the lamp control power supply terminal through the first coil of the common-mode inductor L5, and the output terminal of the second LED light-emitting unit 331 is connected to the third switch unit 312 through the second coil of the common-mode inductor L5. Among them, the first coil of the common-mode inductor L5 can be specifically connected to the VIN pin of the MT7200B chip U3 through a parallel-connected resistor R7 and resistor R8.

[0052] Further, as Figure 6 shown, the second coil of the common-mode inductor L5 is connected to the third switch unit 312 through the inductor L6 and the resistor L2. Among them, the resistor L2 can be specifically connected to the drain of the NMOS transistor Q6. A capacitor C12 and a capacitor C20 can be connected in series between the second coil of the common-mode inductor L5 and the drain of the NMOS transistor Q6. The capacitor C12 and the capacitor C20 are grounded therebetween. A parallel-connected electrolytic capacitor EC4 and a capacitor C21 can also be connected between the first coil and the second coil of the common-mode inductor L5. The resistor L2 and the inductor L6 can also be connected to the VIN pin of the MT7200B chip U3 through a parallel-connected diode D4 and a capacitor C8.

[0053] For other fourth switch units 321 and the corresponding second LED lighting units 331, they can be connected in parallel with the above-mentioned fourth switch unit 321 and the corresponding second LED lighting units 331. By connecting more groups in parallel, more lighting effects can be obtained. Exemplarily, as Figure 6 shown, another fourth switch unit 321 includes an NPN transistor Q4 (2SC1623 can be selected) and a PMOS transistor T4 (GL8P06 can be selected); the emitter of the NPN transistor Q4 is grounded, the collector of the NPN transistor Q4 is connected to the gate of the PMOS transistor T4, and the base of the NPN transistor Q4 is connected to the corresponding color temperature adjustment signal (Y-LED); the source of the PMOS transistor T4 is connected to the source of the PMOS transistor T2, and the drain of the PMOS transistor T4 is connected to the input end of the corresponding second LED lighting unit 331; the output end of the corresponding second LED lighting unit 331 is connected to the output end of other second LED lighting units 331. Among them, a resistor R17 can be connected between the collector of the NPN transistor Q4 and the gate of the PMOS transistor T4, and a resistor R18 can be connected between the source and the gate of the PMOS transistor T4.

[0054] Based on the above technical solution, optionally, as Figure 7 and Figure 8As shown, the double - head lamp control circuit further includes a power adapter module and a voltage conversion module; the input end of the power adapter module is connected to an external power supply, and the output end is used as the lamp control power supply end for supplying power to the first lamp control module 200 and the second lamp control module 300; the input end of the voltage conversion module is connected to the lamp control power supply end, and the output end is used as the magnetic induction power supply end for supplying power to the magnetic induction module 400. Among them, the power adapter module may include an adapter DC 36V 1.35A. The adapter is connected to the lamp control power supply end through the first coil of the common - mode inductor L9 and can provide a 36V DC power supply. The adapter is grounded through the second coil of the common - mode inductor L9, and the lamp control power supply end can be grounded through the capacitor C7. The voltage conversion module may include a voltage conversion chip U1, and the voltage conversion chip U1 can be selected as SL7450. The Vin pin of the voltage conversion chip U1 can be connected to the lamp control power supply end through the series - connected resistors R1 and R2, and the Vout pin can be directly used as the magnetic induction power supply end and can provide a 5V DC power supply for the magnetic induction module 400. The Vin pin of the voltage conversion chip U1 can also be grounded through the parallel - connected capacitors C9 and C10, the Vout pin can also be grounded through the parallel - connected capacitors C3 and C4, and the GND pin is grounded.

[0055] The double - head lamp control circuit provided by the embodiment of the present invention includes a main control module, a magnetic induction module, a first lamp control module, and a second lamp control module. The first lamp control module and the second lamp control module can respectively correspond to the two lamp heads of the double - head lamp. By using the brightness adjustment signal and color temperature adjustment signal output by the main control module to control the brightness and color temperature of each lamp control module simultaneously, more lighting effects can be achieved, thus better meeting the user's needs. At the same time, by providing a magnetic induction signal for indicating the folded or unfolded state of the double - head lamp to the main control module, the switching of the working mode of the double - head lamp in different usage states can be realized.

[0056] Embodiment Two

[0057] The embodiment two of the present invention provides a double - head lamp, which includes the double - head lamp control circuit provided by any embodiment of the present invention and has the beneficial effects corresponding to the circuit structure. As described above, the double - head lamp may specifically include an inner lamp head and an outer lamp head. The inner lamp head and the outer lamp head may be foldably connected. The magnetic induction module may be arranged in the inner lamp head, and accordingly, the magnet may be arranged in the outer lamp head. The specific working principle may refer to the above description.

[0058] Note that the above is only the preferred embodiment of the present utility model and the applied technical principles. Those skilled in the art will understand that the present utility model is not limited to the specific embodiments described herein, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present utility model. Therefore, although the present utility model has been described in detail through the above embodiments, the present utility model is not limited to the above embodiments only. Without departing from the concept of the present utility model, more other equivalent embodiments can be included, and the scope of the present utility model is determined by the scope of the appended claims.

Claims

1. A dual headlight control circuit, characterized in that: include: A main control module, a magnetic induction module, a first light control module and a second light control module; wherein, The main control module is used to receive the magnetic induction signal sent by the magnetic induction module and output a brightness adjustment signal and a color temperature adjustment signal; the magnetic induction signal is used to indicate the folding or unfolding state of the dual headlight; The first light control module includes a first brightness adjustment submodule, a first color temperature adjustment submodule and a first light emitting submodule; the first brightness adjustment submodule is used to adjust the brightness of the first light emitting submodule according to the brightness adjustment signal, and the first color temperature adjustment submodule is used to adjust the color temperature of the first light emitting submodule according to the color temperature adjustment signal; The second lighting control module includes a second brightness adjustment submodule, a second color temperature adjustment submodule and a second light-emitting submodule; the second brightness adjustment submodule is used to adjust the brightness of the second light-emitting submodule according to the brightness adjustment signal, and the second color temperature adjustment submodule is used to adjust the color temperature of the second light-emitting submodule according to the color temperature adjustment signal.

2. The dual headlight control circuit according to claim 1, characterized in that: The brightness adjustment signal includes a first brightness adjustment signal and a second brightness adjustment signal; the first brightness adjustment submodule is specifically used to adjust the brightness of the first light-emitting submodule according to the first brightness adjustment signal, and the second brightness adjustment submodule is specifically used to adjust the brightness of the second light-emitting submodule according to the second brightness adjustment signal; There are multiple color temperature adjustment signals, the first light-emitting submodule includes multiple first LED light-emitting units, the second light-emitting submodule includes multiple second LED light-emitting units, and the number of the first LED light-emitting units and the second LED light-emitting units is the same as the number of the color temperature adjustment signals; the first color temperature adjustment submodule is specifically used to adjust the on and off of the corresponding first LED light-emitting units according to each of the color temperature adjustment signals; the second color temperature adjustment submodule is specifically used to adjust the on and off of the corresponding second LED light-emitting units according to each of the color temperature adjustment signals.

3. The dual headlight control circuit according to claim 2, characterized in that: The first brightness adjustment submodule includes a first driving unit and a first switch unit; the first color temperature adjustment submodule includes a plurality of second switch units, which correspond to the first LED light-emitting units one by one; each of the first LED light-emitting units is connected to the first switch unit and the corresponding second switch unit; the first driving unit is used to receive the first brightness adjustment signal and send a control signal to the first switch unit to control the on and off of the first switch unit; each of the color temperature adjustment signals is used to control the on and off of the corresponding second switch unit; The second brightness adjustment submodule includes a second driving unit and a third switch unit; the second color temperature adjustment submodule includes multiple fourth switch units, and corresponds one-to-one to the second LED light-emitting units; each second LED light-emitting unit is connected to the third switch unit and the corresponding fourth switch unit; the second driving unit is used to receive the second brightness adjustment signal and send a control signal to the third switch unit to control the on and off of the third switch unit; each color temperature adjustment signal is used to control the on and off of the corresponding fourth switch unit.

4. The dual headlight control circuit according to claim 3, characterized in that: One of the second switch units includes an NPN transistor Q1 and a PMOS tube T1; the emitter of the NPN transistor Q1 is grounded, the collector of the NPN transistor Q1 is connected to the gate of the PMOS tube T1, and the base of the NPN transistor Q1 is connected to the corresponding color temperature adjustment signal; the source of the PMOS tube T1 is connected to the light control power supply end, the drain of the PMOS tube T1 is connected to the input end of the corresponding first LED light-emitting unit, and the output end of the corresponding first LED light-emitting unit is connected to the first switch unit and then grounded.

5. The dual headlight control circuit according to claim 4, characterized in that: The first switch unit includes an NMOS tube Q5, and the first driving unit includes an LED driving chip; the dimming control pin of the LED driving chip is connected to the first brightness adjustment signal, and the driving output pin of the LED driving chip is connected to the gate of the NMOS tube Q5; the drain of the NMOS tube Q5 is connected to the output end of each of the first LED light-emitting units, and the source of the NMOS tube Q5 is grounded.

6. The dual headlight control circuit according to claim 5, characterized in that: The LED driver chip is an MT7200B chip U4, the ADJ pin of the MT7200B chip U4 is connected to the first brightness adjustment signal, the DVR pin is connected to the gate of the NMOS tube Q5, the VIN pin is connected to the light control power supply end, the IS pin is connected to the VIN pin through a resistor, the VIN pin is grounded through a capacitor, and the VCC pin is grounded through a capacitor.

7. The dual headlight control circuit according to claim 4, characterized in that: The source of the PMOS tube T1 is connected to the light-controlled power supply end through the first coil of the common-mode inductor L4, and the output end of the first LED light-emitting unit is connected to the first switch unit through the second coil of the common-mode inductor L4.

8. The dual headlight control circuit according to claim 7, characterized in that: The second coil of the common mode inductor L4 is connected to the first switch unit via the inductor L3 and the resistor L1.

9. The dual headlight control circuit according to claim 1, characterized in that: The main control module is connected to a switch button, a color temperature button and a dimming button; the switch button is used to send a switch control signal to the main control module, the color temperature button is used to send a color temperature control signal to the main control module, and the dimming button is used to send a dimming control signal to the main control module.

10. A double headlight, characterized in that: The dual headlight comprises a dual headlight control circuit as described in any one of claims 1-9.

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