CN220545162U - Light filling lamp control circuit of alternating current-direct current power supply - Google Patents

Abstract

The application relates to a light supplementing lamp control circuit for alternating current and direct current power supply, which comprises an AC rectification input module, a DC boosting input module, a switching module, a control module and an LED driving module; the AC rectification input module is used for rectifying the mains supply into direct current, and the output end of the AC rectification input module is electrically connected to the first input end of the switching module; the DC boost input module is used for boosting the battery power supply voltage, the output end of the DC boost input module is electrically connected to the second input end of the switching module, and the output voltage of the DC boost input module is equal to the output voltage of the AC rectification input module; the output end of the switching module is electrically connected to the input ends of the LED driving module and the control module, and the switching module is used for selectively outputting the voltage of the first input end or the voltage of the second input end; the LED driving module is controlled and connected with the control module. The light supplementing lamp has the effect that the light supplementing lamp can meet the use requirements in more occasions.

Description

Light filling lamp control circuit of alternating current-direct current power supply

Technical Field

The application relates to the technical field of photographic equipment, in particular to a light supplementing lamp control circuit powered by alternating current and direct current.

Background

The light filling lamp is widely applied to the field of photography, and the modern light filling lamp is generally set to be an LED light filling lamp at present, and is generally provided with a warm light lamp bead and a cold light lamp bead, so that the LED light filling lamp can have more color temperature selections. Most of the light supplementing lamps are powered by rechargeable batteries, and some of the light supplementing lamps are powered by an isolated voltage reduction mode of an external commercial power AC-DC.

However, since the current light supplementing lamp has a single power supply mode, the light supplementing lamp cannot meet the use requirements in multiple occasions, for example, when a shooting place is outdoor and the light supplementing lamp can only be powered by a battery, if relevant staff only carry the light supplementing lamp which needs to be powered by mains supply at this time, shooting work can be influenced.

Disclosure of Invention

In order to enable the light supplementing lamp to meet the use requirements in more occasions, the application provides a light supplementing lamp control circuit with alternating current and direct current power supply.

The application provides a light filling lamp control circuit of alternating current-direct current power supply adopts following technical scheme:

a light supplementing lamp control circuit for alternating current and direct current power supply comprises an AC rectification input module, a DC boosting input module, a switching module, a control module and an LED driving module.

The AC rectification input module is used for rectifying commercial power into direct current, and the output end of the AC rectification input module is electrically connected to the first input end of the switching module;

the DC boost input module is used for boosting the battery power supply voltage, and the output end of the DC boost input module is electrically connected to the second input end of the switching module; and the output voltage of the DC boost input module is equal to the output voltage of the AC rectification input module;

the output end of the switching module is electrically connected to the input ends of the LED driving module and the control module, and the switching module is used for selectively outputting the voltage of the first input end or the voltage of the second input end;

the LED driving module is controlled and connected with the control module.

By adopting the technical scheme, when related staff selects to output the voltage of the first input end through the switching module, the control module and the LED driving module adopt a mains supply mode; when related staff selects to output the voltage of the second input end through the switching module, the control module and the LED driving module adopt a battery power supply mode, so that the light supplementing lamp can realize a double-path selection power supply mode of mains supply or battery power supply, and further the light supplementing lamp can meet the use requirements in more occasions;

in addition, the LED driving module can be controlled by the control module to realize the function of the light supplementing lamp.

Preferably, the AC rectifying input module includes a rectifying bridge DB1, and a first input terminal and a second input terminal of the rectifying bridge DB1 are electrically connected to a live wire output terminal and a neutral wire output terminal of the utility power, respectively; the first output end of the rectifier bridge DB1 is grounded, and the second output end of the rectifier bridge DB1 is the output end of the AC rectifier input module.

By adopting the technical scheme, the alternating current commercial power can be converted into direct current by utilizing the rectifier bridge and is output to the input end of the switching module.

Preferably, the DC boost input module comprises a first capacitor, an inductor L4, a diode D7 and a second capacitor, the battery powered output bat+ being electrically connected to the positive pole of the first capacitor, the negative pole of the first capacitor being grounded; the positive pole of first condenser electricity is connected to the one end of inductor L4, the other end electricity of inductor L4 is connected to the positive pole of diode D7, the negative pole electricity of diode D7 is connected to the positive pole of second condenser, the negative pole ground of second condenser, and the positive pole of second condenser is for the output of DC boost input module, the positive pole electricity of diode D4 is connected to the relevant switch submodule.

By adopting the technical scheme, whether the diode D7 is grounded or not is controlled by the switch submodule, when the positive electrode of the diode D7 is grounded, the current passing through the inductor L4 is increased, and the inductor L4 converts an electric field into a magnetic field; and then the anode of the diode D7 is separated from the grounding state, at the moment, the magnetic field of the inductor L4 is converted into an electric field, the voltage output by the inductor L4 charges the second capacitor through the diode D4, so that the output voltage of the DC boosting module is improved, the process is repeated to realize boosting until the output voltage of the DC boosting module is raised to be consistent with the output voltage of the AC rectifying input module.

Preferably, the input end of the switch sub-module is electrically connected to the battery power supply output end, the output end of the switch sub-module is electrically connected to the positive electrode of the diode D7, and the output end of the switch sub-module is used for outputting the PWM switch signal pwm_sw.

By adopting the technical scheme, the switch submodule controls whether the diode D7 is grounded or not by outputting the PWM switching signal PWM_SW, so that boosting can be realized.

Preferably, the switching module includes a switch SW1, the switch SW1 includes 6 pins, a pin 3 and a pin 4 are moving ends of the switch SW1, and a pin 1, a pin 2, a pin 5 and a pin 6 are stationary ends of the switch SW 1; the foot 1 and the foot 2 synchronously correspond, and the foot 5 and the foot 6 synchronously correspond;

the pin 1 and the pin 2 are respectively electrically connected to an output end and a ground end of the AC rectification input module; the pin 6 and the pin 5 are electrically connected to the output and ground, respectively, of the DC boost input module; the pin 4 is an output terminal of the switching module, and the pin 3 is a ground terminal GND1.

By adopting the technical scheme, when the pin 4 of the switch SW1 is electrically connected with the pin 1 and the pin 3 is electrically connected with the pin 2, the output end VBS is electrically connected with the output end VBS1, and the voltage of the output end VBS1 is equal to the voltage of the output end VBS, namely the light supplementing lamp is powered by mains supply; when the pin 4 and the pin 6 of the switch SW1 are electrically connected and the pin 3 and the pin 5 are electrically connected, the output end VBS is electrically connected with the output end VBS2, and the voltage of the output end VBS2 is equal to the voltage of the output end VBS, namely, the light supplementing lamp is powered by a battery, so that the switching of a power supply mode is realized.

Preferably, the device further comprises a USB isolation module and a USB interface, wherein the power supply end of the USB isolation module is electrically connected to the output end of the switching module, and the output end of the USB isolation module is electrically connected to the power supply end of the USB interface.

Through adopting above-mentioned technical scheme, utilize USB isolation module to make the light filling lamp can regard as voltage to realize the function of charging for other USB equipment.

Preferably, the control module comprises a non-isolated voltage reduction sub-module and a controller, the voltage reduction sub-module comprises a voltage reduction chip U2, a power supply end of the voltage reduction chip U2 is electrically connected to an output end of the switching module, and an output end of the voltage reduction chip U2 is electrically connected to an input end of the controller; the output end of the controller is used for outputting a PWM voltage signal and a first dimming signal CCT_AD1.

By adopting the technical scheme, the controller can obtain proper power supply voltage by utilizing the voltage-reducing sub-module; compared with the AC-DC isolation voltage reduction scheme, the non-isolation voltage reduction scheme has the advantages of lower cost and smaller overall volume, so that the appearance design of the product is facilitated, and the light supplementing lamp can be more suitable for more use occasions.

Preferably, the LED driving module comprises a non-isolated BUCK sub-module and a color temperature adjusting sub-module, and a first output end of the BUCK sub-module is electrically connected to an input end of the color temperature adjusting sub-module and a power supply end led+ of the light supplementing lamp.

Through adopting above-mentioned technical scheme, utilize BUCK submodule to play the step-down effect, make colour temperature adjust submodule can obtain suitable operating voltage, provide operating voltage for the light filling lamp simultaneously.

Preferably, the signal input end of the color temperature adjusting sub-module is used for receiving a first dimming signal cct_ad1, the first output end of the switch sub-module is electrically connected to the warm color lamp bead cathode end LEDW-, and the second output end of the switch sub-module is electrically connected to the cold color lamp bead cathode end LEDC-.

Through adopting above-mentioned technical scheme, the sub-module is adjusted to colour temperature can be according to the play light proportion of first dimming signal CCT_AD1 regulation warm colour lamp pearl and cold colour lamp pearl to realize the regulation of colour temperature.

Preferably, the signal input end of the BUCK sub-module is used for receiving the PWM voltage signal, the second output end of the BUCK sub-module is used for outputting a dimming signal, and the dimming signal is controlled by the PWM voltage signal; when the color temperature adjusting submodule works normally, the warm color lamp bead negative electrode end LEDW-and the cold color lamp bead negative electrode end LEDC-are electrically connected to the second output end of the BUCK submodule.

By adopting the technical scheme, the luminous depth of the light supplementing lamp can be adjusted according to the PWM voltage signal.

Preferably, the control module further comprises a nixie tube LED1, and a switch signal input pin and a display signal input pin of the nixie tube LED1 are controlled and connected to a signal output end of the controller.

By adopting the technical scheme, the current power supply mode, such as battery power supply display DC, mains power supply display AC and other information, can be displayed by utilizing the nixie tube LED 1.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the switching module is utilized to enable related personnel to select one of mains supply and battery supply modes of the light supplementing lamp, so that the light supplementing lamp can be applied to more use scenes;

2. the voltage-reducing sub-module and the non-isolated dimming BUCK sub-module both adopt a non-isolated voltage-reducing scheme, and compared with the isolated voltage-reducing scheme, the cost is lower, and the whole volume is smaller, so that the appearance design of a product is facilitated, and the light-compensating lamp can be more suitable for more use occasions;

3. the USB isolation module is utilized to add a USB charging function for the light supplementing lamp, so that the light supplementing lamp can charge equipment such as a mobile phone and the like, and more functions are added for the light supplementing lamp;

4. and adjust luminance BUCK sub-module still has the effect of adjusting the degree of depth of adjusting luminance, combines the colour temperature to adjust sub-module and can realize the steady colour temperature regulatory function of transition, improves and uses experience.

Drawings

FIG. 1 is a functional block diagram of an embodiment of the present application;

FIG. 2 is a circuit diagram of an AC rectifying input module in an embodiment of the present application;

FIG. 3 is a circuit diagram of a DC rectifying boost module in an embodiment of the present application;

FIG. 4 is a circuit diagram of a switch sub-module in an embodiment of the present application;

FIG. 5 is a circuit diagram of a secure electronic module in an embodiment of the present application;

FIG. 6 is a circuit diagram of a switching module in an embodiment of the present application;

FIG. 7 is a circuit diagram of a buck sub-module in an embodiment of the present application;

FIG. 8 is a circuit diagram of a controller and peripheral components in an embodiment of the present application;

FIG. 9 is a circuit diagram of a digital pipe and peripheral components in an embodiment of the present application;

FIG. 10 is a circuit diagram of a knob and its internal components in an embodiment of the present application;

FIG. 11 is a circuit diagram of a BUCK drive sub-module in an embodiment of the present application;

FIG. 12 is a circuit diagram of a color temperature adjustment sub-module in an embodiment of the present application;

FIG. 13 is a circuit diagram of a USB isolation module in an embodiment of the present application.

Reference numerals: 1. an AC rectifying input module; 11. a first filtering sub-module; 2.a DC boost input module; 3. a switching module; 4. a control module; 41. a voltage reduction sub-module; 42. a controller; 5. an LED driving module; 51. a BUCK driving sub-module; 52. a color temperature adjusting sub-module; 6. a USB isolation module; 61. a second filtering sub-module; 62. USB charging sub-module.

Detailed Description

The present application is described in further detail below in conjunction with figures 1-13.

The embodiment of the application discloses an alternating current-direct current power supply's light filling lamp control circuit.

Referring to fig. 1, a light supplementing lamp control circuit for AC/DC power supply includes an AC rectifying input module 1, a DC boosting input module 2, a switching module 3, a control module 4, and an LED driving module 5. The AC rectifying input module 1 is used for rectifying AC mains to a first DC power supply VBS, and the DC boost input module 2 is used for raising the battery voltage, so as to obtain a second DC power supply VBS2 having the same output voltage value as the first DC power supply VBS. The output ends of the AC rectifying input module 1 and the DC boosting input module 2 are electrically connected to the input end of the switching module 3, the output end of the switching module 3 is electrically connected to the input ends of the LED driving module 5 and the control module 4, and related staff select the control module 4 and the LED driving module 5 to be powered by mains supply or batteries through the switching module 3. The control module 4 includes a voltage-reducing sub-module 41 and a controller 42, wherein an input end of the voltage-reducing sub-module 41 is electrically connected to an output end of the switching module 3, an output end of the voltage-reducing sub-module 41 is electrically connected to a power supply end of the controller 42, and the voltage-reducing sub-module 41 is used for providing a suitable working voltage for the controller 42. The LED driving module 5 comprises a BUCK driving sub-module 51, a color temperature adjusting sub-module 52 and an LED lamp, the output end of the switching module 3 is electrically connected to the input end of the LED lamp through the BUCK driving sub-module 51 and the color temperature adjusting sub-module 52 in sequence, and the BUCK driving sub-module 51 and the color temperature adjusting sub-module 52 are electrically connected to the controller 42 in a controlled manner; the color temperature adjusting sub-module 52 is used for adjusting the color temperature and the color of the LED lamp, and the BUCK driving sub-module 51 is used for providing a working power supply for the color temperature adjusting sub-module 52 and controlling the switch of the LED lamp. In addition, the output end of the switching module 3 is electrically connected with a USB isolation module 6, and the USB isolation module 6 is used for providing a charging power supply for other devices. The step-down submodule 41 and the BUCK driving submodule 51 in the application adopt non-isolation schemes, and compared with the AC-DC isolation step-down scheme, the step-down submodule has the advantages of low design cost and small overall volume, and is convenient for the appearance design of products, so that the light supplementing lamp can be more suitable for more use occasions.

Referring to fig. 2, the ac rectification input module 1 rectifies a bridge DB1, a live wire output end of the utility power is electrically connected to a pin 1 of the rectification bridge DB1, a neutral wire output end of the utility power is electrically connected to a pin 2 of the rectification bridge DB1, a second pin 3 of the rectification bridge DB1 is grounded GND, and a pin 4 of the rectification bridge DB1 is electrically connected to a first filter sub-module 11. The first filtering sub-module 11 includes an inductor L1, a resistor R3, a capacitor EC1 and a capacitor EC2, the pin 4 of the rectifier bridge DB1 is electrically connected to one end of the inductor L1, the other end of the inductor L1 is the output VBS of the AC rectifier input module 1, and the resistor R3 is connected in parallel to two ends of the inductor L1. Both ends of the inductor L1 are grounded GND through the capacitor EC1 and the capacitor EC2, respectively, and the negative electrodes of the capacitor EC1 and the capacitor EC2 are grounded GND, and the positive electrodes of the capacitor EC1 and the capacitor EC2 are electrically connected to both ends of the inductor L1. The first filtering sub-module 11 plays a role in filtering and stabilizing voltage, so that AC mains can be converted into dc which is as stable as possible, and in this embodiment, the output voltage of the output end VBS of the AC rectifying input module 1 is 120V.

The AC rectifying input module 1 further includes a fuse F1, where the fuse F1 is connected in series between the live wire output terminal and the first input terminal of the rectifying bridge DB1, and plays a role in preventing surge, so as to provide protection for the electronic components in the present embodiment.

Referring to fig. 3, the dc boost input module 2 includes a first capacitor, a second capacitor, an inductor L4, and a diode D7. The first capacitor is first parallelly connected capacitor bank in this application, and the second capacitor sets up to the parallelly connected capacitor bank of second, and a plurality of capacitors are parallelly connected can practice thrift the cost when improving electric capacity. The second capacitor includes a capacitor EC7, a capacitor EC8 and a capacitor EC9 connected in parallel in this order, and the second parallel capacitor group includes a capacitor EC10, a capacitor EC11 and a capacitor EC11 connected in parallel in this order. The battery-powered output BAT + is electrically connected to the positive pole of the first parallel capacitor bank, the negative pole of which is grounded GND2. The positive pole of the first parallel capacitor bank is further electrically connected to one end of the inductor L4, the other end of the inductor L4 is electrically connected to the positive pole of the diode D7, the negative pole of the diode D7 is electrically connected to the positive pole of the second parallel capacitor bank, the negative pole of the second parallel capacitor bank is grounded GND2, and the negative pole of the diode D7 is the output VBS2 of the DC boost input module 2. The connection point between the inductor L4 and the anode of the diode D7 is set as a connection point a, and the connection point a is electrically connected with a switch sub-module, and the switch sub-module is used for controlling whether the connection point a is grounded GND2.

The principle of the DC boost input module 2 to achieve boost is: when the connection point a is grounded to GND2, the current passing through the inductor L4 increases, and the inductor L4 converts the electric field into a magnetic field; and then the connection point a is separated from the ground GND2 state, at this time, the magnetic field of the inductor L4 is converted into an electric field, the voltage output by the inductor L4 charges the second parallel capacitor bank through the diode D4, so that the output voltage of the output end VBS2 is improved, and the process is repeated to realize boosting until the voltage of the output end VBS2 is raised to be consistent with the voltage of the output end VBS.

Referring to fig. 4, the switch submodule includes a PWM control chip U1 and peripheral elements, where the PWM control chip U1 is a constant-frequency current mode controller 42, and in this embodiment, the PWM control chip U1 specifically uses a UC2843 chip. The output end VBS2 is electrically connected to the pin VFB through a voltage division network composed of a resistor R23, a resistor R29, a resistor R57 and a resistor R57, the pin VFB collects the change of the output voltage of the output end VBS2 and feeds back the change to an error amplifier in the PWM control chip, the error voltage is generated through comparison so as to adjust the pulse width of PWM and output, and the resistor R30, the capacitor C17 and the capacitor C18 form a frequency compensation network of the error amplifier. A resistor R61 is connected in series between the pin RT/CT and the pin Vref, and the pin RT/CT is grounded GND2 through a capacitor C23, thereby setting the oscillation frequency and the duty ratio of the oscillator inside the PWM control chip U1. Transistor Q8, resistor R58, resistor R60, and capacitor C22 between pin RT/CT and pin Isense form a current ramp compensation network.

Referring to fig. 3 and 4, pin OUTPUT is electrically connected to a transistor Q7 through a resistor R55, a base of the transistor Q7 is electrically connected to pin OUTPUT through a resistor R55, a collector of the transistor Q7 is electrically connected to pin Isense through a resistor R60, and an emitter of the transistor is electrically connected to an NMOS transistor Q6 through a resistor R54. The gate of the NMOS transistor Q6 is electrically connected to the emitter of the transistor Q7 through a resistor R54, and a resistor R59 is connected in series between the gate of the NMOS transistor Q6 and the collector of the transistor Q7. The source electrode of the NMOS tube Q6 is grounded to the GND2 through a resistor, the drain electrode of the NMOS tube Q6 is an output end of a switch sub-module, the output end of the switch sub-module is used for outputting a PWM switching signal PWM_SW, and the output end of the switch sub-module is electrically connected to the positive electrode of the diode D7, so that the connection point a can be controlled to be repeatedly electrically connected and disconnected with the grounding end GND2, the boosting function of the DC boosting module is further realized, and the output voltage of the DC boosting module can be raised to be equal to the AC rectification input voltage.

Referring to fig. 5, the switching sub-module further includes a safety power supply module including a resistor R66, a transistor Q9, a zener diode ZD1, a diode D8, and a capacitor C24. The output end BAT+ of the battery power supply is electrically connected to the base electrode of the triode Q9 through the resistor R66, the collector electrode of the triode Q9 is electrically connected to the output end BAT+, the emitter electrode of the triode Q9 is electrically connected to the positive electrode of the diode D8, and the negative electrode of the diode D8 is electrically connected to the output end of the power supply VCC. The positive electrode of the zener diode ZD1 is grounded GND2, and the negative electrode of the zener diode ZD1 is electrically connected to the base electrode of the triode Q9. The output terminal of the power supply VCC is electrically connected to one terminal of the capacitor C24, and the other terminal of the capacitor C24 is grounded GND2. When the output end BAT+ outputs voltage, the base electrode of the triode Q9 is raised, the triode Q9 is conducted at the moment, and the output end of the power supply VCC is output as the power supply VCC through the diode D8. The voltage stabilizing diode ZD1 plays a role in reverse connection prevention and protection, the capacitor C24 plays a role in filtering and voltage stabilization, and the output voltage of the power supply VCC is clear and stable as far as possible, so that the PWM control chip U1 can work stably.

Referring to fig. 6, the switching module 3 includes a switch SW1 capable of being set as two synchronous single pole double throw switches, the pin 1 of the switch SW1 is electrically connected to the output terminal VBS, and the pin 2 of the switch SW1 is electrically connected to the ground terminal GND; the pin 6 of the switch SW1 is electrically connected to the output terminal VBS2, and the pin 5 of the switch SW1 is electrically connected to the ground terminal GND2; the pin 3 of the switch SW1 is electrically connected to the ground GND1, and the pin 4 of the switch SW1 is electrically connected to the output VBS1 of the switching module 3. When the pin 4 and the pin 1 of the switch SW1 are electrically connected and the pin 3 and the pin 2 are electrically connected, the output end VBS is electrically connected with the output end VBS1, and the voltage of the output end VBS1 is equal to the voltage of the output end VBS, namely the light supplementing lamp is powered by mains supply; when the pin 4 and the pin 6 of the switch SW1 are electrically connected, and the pin 3 and the pin 5 are electrically connected, the output end VBS is electrically connected with the output end VBS2, the voltage of the output end VBS2 is equal to the voltage of the output end VBS, namely, the light supplementing lamp is powered by a battery, and the switching of a power supply mode is realized by controlling the switch SW 1.

Referring to fig. 7, the buck submodule 41 includes a non-isolated buck chip U2 and its peripheral components, where the buck chip U2 is a BP8522D chip. The output terminal VBS1 is electrically connected to the pin DRAIN of the buck chip U2, and the pin VOUT is the output terminal VL of the buck submodule 41, and the voltage value of the output terminal VL in this application is 5V. Since the voltage values of the voltage output terminal VBS and the voltage output terminal VBS2 in the present application are both 120V, the voltage values are far higher than the rated operating voltage of most of the controllers 42 on the market. It is therefore necessary to provide the appropriate operating voltage for the controller 42 by reducing the sub-modules to act as a buck.

Referring to fig. 8, the controller 42 is set as a single-chip microcomputer U3, and in this application, the controller 42 adopts a PMS134 single-chip microcomputer with 24 pins. The pin VDD of the singlechip U3 is electrically connected to the output end VL, and the pin VDD is grounded GND1 through a capacitor C10, so that the singlechip U3 can be electrically powered. The pin RESET is electrically connected with a RESET network and used for enabling the singlechip U3 to RESET and restart when the computer crashes. The pin PA4/PG1PWM is used for outputting a PWM voltage, and the pin PA4/PG1PWM is used for outputting the first dimming signal cct_ad1.

Referring to fig. 8 and 9, the control module 4 further includes a nixie tube LED1 and peripheral elements, the nixie tube is provided with a ground pin Dig1-1, a ground pin Dig2-1 and 8 signal input pins, and 8 IO pins of the single chip microcomputer are electrically connected to the 8 signal input pins in a one-to-one correspondence manner, and display of the nixie tube is controlled through 8-bit binary system. The grounding pin Dig1-1 is electrically connected with a triode Q3, the base electrode of the triode Q3 is electrically connected to a pin PC5 of the singlechip U3, the collector electrode of the base electrode of the triode Q3 is electrically connected to the grounding pin Dig1-1, and the emitter electrode of the triode Q3 is grounded. The grounding pin Dig2-1 is electrically connected with a triode Q4, the base electrode of the triode Q4 is electrically connected to a pin PC4 of the singlechip U3, the collector electrode of the base electrode of the triode Q3 is electrically connected to the grounding pin Dig2-1, and the emitter electrode of the triode Q4 is grounded. When the pin PC4 and the pin PC5 output high-level signals, the triode Q3 and the triode Q4 are conducted, and the grounding pin Dig1-1 and the grounding pin Dig2-1 are grounded to GND1 at the moment, so that the nixie tube LED1 can start to work. The nixie tube can be configured to display the current power supply mode, such as battery power to display DC, mains power to display AC, and other information.

Referring to fig. 10, in addition to this, the control module 4 further includes a knob CN1, where the knob CN1 is provided with 4 pins, and the knob CN1 includes a first varistor VR1 and a second varistor VR2. The pin 1 is electrically connected to the output end VL, the output end VL is electrically connected to one ends of the first varistor VR1 and the second varistor VR2, the other ends of the first varistor VR1 and the second varistor VR2 are grounded GND1, and the pin 4 is grounded GND1. Pin 2 is the control terminal of the second varistor VR2 and pin 3 is the control terminal of the first varistor VR2. The control end of the first varistor VR2 and the control end of the second varistor VR2 are synchronously and complementarily regulated, and when the output resistance of the first varistor VR1 becomes smaller, the output resistance of the second varistor VR2 becomes larger; when the output resistance of the first varistor VR1 becomes large, the output resistance of the second varistor VR2 becomes small. Referring to fig. 8 and 10, the pin 2 outputs a second dimming signal cct_ad2 to the pin PC1/AD11 of the single chip microcomputer U3, and the single chip microcomputer U3 can change the duty ratio of the PWM voltage output by the single chip microcomputer U3 according to the received second dimming signal cct_ad 2. And the pin 3 can be set to output a brightness signal light_ad, the brightness signal light_ad is output to an analog input pin of the singlechip U3, and after being processed by the singlechip U3, brightness information can be set to be displayed on the nixie tube LED 1.

Referring to fig. 11, the buck driving sub-module 51 includes a non-isolated dimming buck chip U4 and its peripheral components, where the dimming buck chip U4 is a BP2879 chip. The pin VCC of the dimming buck chip U4 is electrically connected to the output terminal VB1 through the resistor R4 and the resistor R1 in sequence, and the pin GND of the dimming buck chip U4 is grounded GND1, so that the dimming buck chip U4 can be electrically operated. The pin PWM of the dimming voltage reduction chip U4 is electrically connected to the pin PA4/PG1PWM of the singlechip U3 through a resistor R19 and is used for receiving PWM voltage output by the singlechip U3, so that the duty ratio of the output voltage of the pin GATE is regulated, and the purpose of voltage reduction is achieved. The first output terminal out_a of the BUCK driving sub-module 51 is used for outputting the voltage after the step-down, and the second output terminal out_b of the BUCK driving sub-module 51 is used for outputting the analog dimming voltage current.

Referring to fig. 12, a power supply end led+, a warm lamp bead cathode end LEDW-, and a cold lamp bead cathode end LEDC-, are provided on the LED lamp J1, the power supply end led+ is electrically connected to a first output end out_a of the BUCK sub-module, and the voltage of the first output end out_a can be adjusted under the action of a knob, so as to change the light emitting degree of the LED lamp J1. The color temperature adjusting sub-module 52 controls the color temperature and color of the LED lamp by adjusting the currents output to the warm color bead control terminal LEDW-and the cool color bead control terminal LEDC-.

Referring to fig. 12, the color temperature adjusting sub-module 52 includes a color mixing control chip U5 and peripheral elements, and the color mixing control chip U5 is a BP5929 chip in this application. The pin VCC of the color matching control chip U5 is electrically connected to the output end of the BUCK driving sub-module 51 sequentially through the resistor R20 and the resistor R16, and the pin GND of the color matching control chip U5 is grounded GND1, so that the color matching control chip U5 can be electrically operated. A capacitor C3 is connected in series between the pin VCC and the pin GND, two ends of the capacitor C3 are connected in parallel with a zener diode ZD11, an anode of the zener diode ZD11 is grounded GND1, and a cathode of the zener diode ZD11 is electrically connected to the pin VCC, so that stability of the voltage of the pin VCC input to the color mixing control chip U5 is improved. The pin OUT2 is electrically connected with an NMOS tube Q5, the grid electrode of the NMOS tube Q5 is electrically connected to the pin OUT2, and the drain electrode of the NMOS tube Q5 is electrically connected to the negative electrode end LEDW-of the warm color lamp bead; the pin OUT1 is electrically connected with an NMOS tube Q2, the grid electrode of the NMOS tube Q2 is electrically connected to the pin OUT1, and the drain electrode of the NMOS tube Q5 is electrically connected to the negative electrode end LEDC-of the cold lamp bead; and the source of the NMOS transistor Q5 and the source of the NMOS transistor Q2 are electrically connected to the second output terminal out_b of the BUCK driving sub-module 51. The color matching control chip U5 outputs complementary currents at the pin OUT1 and the pin OUT2 according to a first dimming signal CCT_AD1 received by a pin PWM of the color matching control chip U5, so that the light emitting proportion of the warm color lamp bead and the cold color lamp bead can be adjusted according to the duty ratio of the first dimming signal CCT_AD1, and the light emitting color temperature and the color of the LED lamp can be adjusted; and in the color mixing process, the total current flowing into the warm color lamp beads and the cold color lamp beads is unchanged, and the total current is equal to the analog dimming voltage current output by the second output end out_b, so that the warm color lamp beads and the cold color lamp beads have certain low dimming depth, and the use feeling is increased.

Referring to fig. 13, the usb isolation module 6 includes a second filtering sub-module 61, the second filtering sub-module 61 includes an inductor L2, a resistor R32, a capacitor EC5, and a capacitor EC6, the output terminal VBS1 is electrically connected to one end of the inductor L2, and the other end of the inductor L2 is an output terminal of the second filtering sub-module 61. The resistor R32 is connected in parallel to two ends of the inductor L2, two ends of the inductor L2 are grounded GND1 through the capacitor EC5 and the capacitor EC6, the negative electrodes of the capacitor EC5 and the capacitor EC6 are grounded GND1, the positive electrodes of the capacitor EC5 and the capacitor EC6 are electrically connected to two ends of the inductor L2, and the second filter sub-module 61 plays a role in filtering and stabilizing voltage, so that the output end of the second filter sub-module 61 can output stable and clear voltage.

Referring to fig. 13, the USB isolation module 6 further includes a USB interface sub-module and a USB charging sub-module 62 formed by a USB charging chip U6 and peripheral elements thereof, where the USB charging chip U6 is a S7134B chip. The pin VCC of the USB charging chip U6 is electrically connected to the output terminal of the second filtering sub-module 61 through the resistor R42 and the resistor R33 in sequence, and the pin GND is grounded GND3, so that the USB charging chip U6 can be electrically powered. A capacitor C13 is connected in series between the ground terminal GND1 and the ground terminal GND3 for suppressing common mode interference. The USB charging chip U6 is used for outputting stable charging voltage, and the output end of the USB charging chip U6 is set to be a power supply end VC, and the voltage value of the power supply end VC is 5V in the application.

The USB interface submodule comprises a first interface USB1, and the first interface USB1 is provided with 4 pins. Pin 1 is all electrically connected to power supply end VC, and pin 4 ground GND3 has a resistor R31 in series between pin 1 and pin 2, has a resistor R41 in series between pin 2 and pin 3, has a resistor R47 in series between pin 3 and pin 4. The USB interface sub-module further comprises a second interface USB2 with 4 pins, and the 4 pins of the second interface USB2 are in one-to-one correspondence with the 4 pins of the first interface USB 1. After the external device is inserted into the first interface USB1 and/or the second interface USB2, the external device can be charged.

The implementation principle of the light supplementing lamp control circuit for alternating current and direct current power supply in the embodiment of the application is as follows: the voltage-reducing sub-module 41 and the non-isolated dimming BUCK sub-module both adopt a non-isolated voltage-reducing scheme, so that compared with the isolated voltage-reducing scheme, the cost is lower, the whole volume is smaller, the appearance design of a product is facilitated, and the light-compensating lamp can be more suitable for more use occasions; the switching module 3 enables related personnel to select one of the mains supply and battery supply modes for the light supplementing lamp, so that the light supplementing lamp can be applied to more use scenes.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims (10)

1. A light filling lamp control circuit of alternating current-direct current power supply, its characterized in that: the LED power supply comprises an AC rectification input module (1), a DC boost input module (2), a switching module (3), a control module (4) and an LED driving module (5);

the AC rectification input module (1) is used for rectifying commercial power into direct current, and the output end of the AC rectification input module (1) is electrically connected to the first input end of the switching module (3);

the DC boost input module (2) is used for boosting the battery power supply voltage, the output end of the DC boost input module (2) is electrically connected to the second input end of the switching module (3), and the output voltage of the DC boost input module (2) is equal to the output voltage of the AC rectification input module (1);

the output end of the switching module (3) is electrically connected to the input ends of the LED driving module (5) and the control module (4), and the switching module (3) is used for selectively outputting the voltage of the first input end or the voltage of the second input end;

the LED driving module (5) is controlled and connected with the control module (4).

2. The light filling lamp control circuit of an ac/dc power supply according to claim 1, wherein: the AC rectifying input module (1) comprises a rectifying bridge DB1, wherein a first input end and a second input end of the rectifying bridge DB1 are respectively and electrically connected to a live wire output end and a zero wire output end of the commercial power; the first output end of the rectifier bridge DB1 is grounded, and the second output end of the rectifier bridge DB1 is the output end of the AC rectifier input module (1).

3. The light filling lamp control circuit of an ac/dc power supply according to claim 1, wherein: the DC boost input module (2) comprises a first capacitor, an inductor L4, a diode D7 and a second capacitor, wherein the output end BAT+ powered by a battery is electrically connected to the positive electrode of the first capacitor, and the negative electrode of the first capacitor is grounded; the positive pole of first condenser electricity is connected to the one end of inductor L4, the other end electricity of inductor L4 is connected to the positive pole of diode D7, the negative pole electricity of diode D7 is connected to the positive pole of second condenser, the negative pole ground of second condenser, and the positive pole of second condenser is for the output of DC boost input module (2), the positive pole electricity of diode D4 is connected to the relevant switch submodule.

4. A light filling lamp control circuit of ac/dc power supply according to claim 3, wherein: the input end of the switch sub-module is electrically connected to the battery power supply output end, the output end of the switch sub-module is electrically connected to the positive electrode of the diode D7, and the output end of the switch sub-module is used for outputting a PWM switching signal PWM_SW.

5. The light filling lamp control circuit of an ac/dc power supply according to claim 1, wherein: the switching module (3) comprises a switch SW1, the switch SW1 comprises 6 pins, a pin 3 and a pin 4 are the movable ends of the switch SW1, and a pin 1, a pin 2, a pin 5 and a pin 6 are the stationary ends of the switch SW 1; the foot 1 and the foot 2 synchronously correspond, and the foot 5 and the foot 6 synchronously correspond;

the pin 1 and the pin 2 are respectively electrically connected to an output end and a ground end of the AC rectification input module (1); the pin 6 and the pin 5 are electrically connected to the output and ground, respectively, of the DC boost input module (2); the pin 4 is an output end of the switching module (3), and the pin 3 is a ground end GND1.

6. The light filling lamp control circuit of an ac/dc power supply according to claim 1, wherein: the USB switch further comprises a USB isolation module (6) and a USB interface, wherein the power supply end of the USB isolation module (6) is electrically connected to the output end of the switching module (3), and the output end of the USB isolation module (6) is electrically connected to the power supply end of the USB interface.

7. The light filling lamp control circuit of claim 6, wherein: the control module (4) comprises a non-isolated voltage reduction submodule (41) and a controller (42), the voltage reduction submodule (41) comprises a voltage reduction chip U2, a power supply end of the voltage reduction chip U2 is electrically connected to an output end of the switching module (3), and an output end of the voltage reduction chip U2 is electrically connected to an input end of the controller (42); an output end of the controller (42) is used for outputting a PWM voltage signal and a first dimming signal CCT_AD1.

8. The light filling lamp control circuit of claim 7, wherein: the LED driving module (5) comprises a non-isolated BUCK sub-module and a color temperature adjusting sub-module (52), wherein a first output end of the BUCK sub-module is electrically connected to an input end of the color temperature adjusting sub-module (52) and a power supply end LED+ of the light supplementing lamp.

9. The light filling lamp control circuit of claim 8, wherein: the signal input end of the color temperature adjusting sub-module (52) is used for receiving a first dimming signal CCT_AD1, the first output end of the color temperature adjusting sub-module (52) is electrically connected to the warm color lamp bead negative electrode end LEDW-, and the second output end of the color temperature adjusting sub-module (52) is electrically connected to the cold color lamp bead negative electrode end LEDC-.

10. The light filling lamp control circuit of claim 9, wherein: the signal input end of the BUCK sub-module is used for receiving the PWM voltage signal, the second output end of the BUCK sub-module is used for outputting a dimming signal, and the dimming signal is controlled by the PWM voltage signal; when the color temperature adjusting sub-module (52) is operating normally, the warm bulb negative terminal LEDW-and the cool bulb negative terminal LEDCC-are electrically connected to the second output terminal of the BUCK sub-module.