CN113556845A - Power supply control circuit, power supply control method and LED drive circuit - Google Patents

Power supply control circuit, power supply control method and LED drive circuit Download PDF

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Publication number
CN113556845A
CN113556845A CN202110952692.XA CN202110952692A CN113556845A CN 113556845 A CN113556845 A CN 113556845A CN 202110952692 A CN202110952692 A CN 202110952692A CN 113556845 A CN113556845 A CN 113556845A
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voltage
power supply
signal
circuit
control circuit
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刘白仁
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Shenzhen Biyi Microelectronics Co Ltd
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Shenzhen Biyi Microelectronics Co Ltd
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/165—Controlling the light source following a pre-assigned programmed sequence; Logic control [LC]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

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Abstract

The invention provides a power supply control circuit, a power supply control method and an LED drive circuit. The first voltage conversion circuit is used for converting the first voltage into a supply voltage. The input end of the supply voltage control circuit is coupled to the first voltage conversion circuit, and the supply voltage control circuit is used for outputting a first control signal according to the supply voltage. The input end of the driving voltage control circuit receives a representation signal representing the driving voltage, and the driving voltage control circuit is used for outputting a second control signal according to the representation signal. The switch control circuit is used for generating a switch driving signal according to the first control signal and the second control signal. The power supply control circuit, the power supply control method and the LED drive circuit provided by the invention can solve the problems of power supply and drive voltage control of a plurality of paths of LED drive circuits, simplify the system power supply architecture and effectively save the system cost.

Description

Power supply control circuit, power supply control method and LED drive circuit
Technical Field
The invention belongs to the technical field of power electronics, relates to an LED driving technology, and particularly relates to a power supply control circuit, a power supply control method and an LED driving circuit.
Background
The LED lamp is widely applied to the field of illumination due to the characteristics of high brightness, low power consumption, long service life and the like. In the LED driving circuit, the existing LED driving module and the auxiliary power supply module are separated, the LED driving module controls the LED current, and the auxiliary power supply module supplies power to the dimming module, so that the LED driving circuit needs two sets of circuits and a control chip, and a peripheral circuit is complex. With the continuous increase of the demand for illumination quality, illumination schemes such as RGB + W light strings and RGB + CW light strings gradually appear. When an RGB + CW 5-path LED driving circuit is involved, if the string voltage difference between the RGB string light and the CW string light is relatively large, the same power supply voltage cannot be used to supply power to the RGB string light and the CW string light, so that a power supply module needs to be added to supply power to the RGB string light, which makes the system more complex and the production cost higher.
In view of the above, there is a need to provide a new structure or control method for solving at least some of the above problems.
Disclosure of Invention
The invention provides a power supply control circuit, a power supply control method and an LED drive circuit, aiming at one or more problems in the prior art.
According to an aspect of the present invention, there is disclosed a power supply control circuit including:
the first voltage conversion circuit is used for converting the first voltage into a power supply voltage so as to supply power to the power supply control circuit;
a supply voltage control circuit, an input terminal of which is coupled to the first voltage conversion circuit, for outputting a first control signal according to a supply voltage to control the supply voltage;
the input end of the driving voltage control circuit receives a representation signal representing the driving voltage and is used for outputting a second control signal according to the representation signal so as to control the driving voltage; the power supply voltage or the driving voltage is used for driving the first load, and the driving voltage is used for driving the second load; and
and the first input end of the switch control circuit is coupled with the power supply voltage control circuit, and the second input end of the switch control circuit is coupled with the driving voltage control circuit and used for generating a switch driving signal according to the first control signal and the second control signal so as to control the main switching tube.
Preferably, the supply voltage control circuit includes: a first input terminal of the first comparison circuit is coupled to the first reference signal terminal for receiving the first reference signal, a second input terminal of the first comparison circuit is coupled to the power supply voltage terminal for receiving the power supply voltage, and an output terminal of the first comparison circuit outputs a first control signal.
Preferably, the characterization signal is an analog signal, and the driving voltage control circuit includes:
an operational amplifier circuit, a first input terminal of which is coupled to the second reference signal terminal for receiving the second reference signal, and a second input terminal of which is coupled to the characterization signal terminal for receiving the characterization signal; and
the first end of the first capacitor is respectively coupled with the output end of the operational amplifier circuit and the switch control circuit, and the second end of the first capacitor is coupled with the reference ground.
Preferably, the characterization signal is a logic signal, and the driving voltage control circuit includes:
a first capacitor, a first end of which is coupled to the switch control circuit, and a second end of which is coupled to the reference ground; and
and the input end of the charging and discharging control circuit is coupled with the representation signal end to receive the representation signal and is used for controlling the charging and discharging of the first capacitor according to the representation signal.
Preferably, the switch control circuit includes:
the first input end of the conduction time control circuit is coupled with the power supply voltage control circuit, and the second input end of the conduction time control circuit is coupled with the driving voltage control circuit and used for controlling the conduction time of the main switching tube according to a first control signal and a second control signal; and
and the input end of the switch driving signal generating circuit is coupled with the output end of the conduction time control circuit, and the output end of the switch driving signal generating circuit is coupled with the main switching tube and used for outputting a switch driving signal.
Preferably, the first voltage conversion circuit includes an auxiliary winding, and the first voltage is converted into the supply voltage by the first voltage conversion circuit.
Preferably, the power supply control circuit further includes: and the input end of the second voltage conversion circuit is coupled with the power supply voltage end to receive the power supply voltage, and the second voltage conversion circuit is used for converting the power supply voltage into a second voltage to supply power to the communication module.
According to another aspect of the invention, an LED driving circuit is disclosed, which includes a driving voltage conversion circuit and a power supply control circuit as described in any one of the above, and controls the driving voltage output by the driving voltage conversion circuit by controlling the switching state of the main switching tube.
Preferably, the supply voltage control circuit is configured to control the driving voltage conversion circuit to operate in an increased power output mode when the supply voltage is lower than a third reference signal, so as to increase the output energy of the driving voltage conversion circuit.
Preferably, the supply voltage is used for driving a first load, and the driving voltage is used for driving a second load; the first load is an RGB lamp string, and the second load is a cold white lamp string and a warm white lamp string.
Preferably, the driving voltage is used for driving the first load and the second load; the first load is an RGB lamp string, and the second load is a cold white lamp string and a warm white lamp string.
According to still another aspect of the present invention, there is disclosed a power supply control method including:
converting the first voltage into a supply voltage to supply power to the power supply control circuit;
outputting a first control signal according to the power supply voltage to control the power supply voltage;
outputting a second control signal according to the representation signal representing the driving voltage so as to control the driving voltage; the power supply voltage or the driving voltage is used for driving a first load, and the driving voltage is used for driving a second load; and
and generating a switch driving signal according to the first control signal and the second control signal so as to control a main switching tube.
Preferably, the step of outputting the first control signal according to the supply voltage includes: the first reference signal is compared to the supply voltage to generate a first control signal.
Preferably, the step of outputting the second control signal according to the characterization signal characterizing the driving voltage comprises:
generating a second control signal according to the second reference signal and the characterization signal, wherein the characterization signal is an analog signal; or
And controlling the charging and discharging of the first capacitor according to the characterization signal, and obtaining a second control signal through the first end of the first capacitor, wherein the characterization signal is a logic signal.
Preferably, the power supply control method further includes: and converting the power supply voltage into a second voltage to supply power to the communication module.
Preferably, the power supply control method further includes: and when the power supply voltage is lower than the third reference signal, controlling the driving voltage conversion circuit to work in a power output increasing mode so as to increase the output energy of the driving voltage conversion circuit.
Preferably, the power supply voltage is used for driving a first load, the driving voltage is used for driving a second load, the first load is an RGB light string, and the second load is a cold white light string and a warm white light string.
Preferably, the driving voltage is used for driving a first load and a second load, the first load is an RGB light string, and the second load is a cold white light string and a warm white light string.
The invention provides a power supply control circuit, a power supply control method and an LED drive circuit, wherein the power supply control circuit comprises a first voltage conversion circuit, a power supply voltage control circuit, a drive voltage control circuit and a switch control circuit. The first voltage conversion circuit is used for converting the first voltage into a power supply voltage to supply power to the power supply control circuit. The input end of the supply voltage control circuit is coupled to the first voltage conversion circuit, and the supply voltage control circuit is used for outputting a first control signal according to the supply voltage so as to control the supply voltage. The input end of the driving voltage control circuit receives a representation signal representing the driving voltage, and the driving voltage control circuit is used for outputting a second control signal according to the representation signal to control the driving voltage. The supply voltage or the drive voltage is used to drive the first load and the drive voltage is used to drive the second load. The first input end of the switch control circuit is coupled with the power supply voltage control circuit, the second input end of the switch control circuit is coupled with the driving voltage control circuit, and the switch control circuit is used for generating a switch driving signal according to the first control signal and the second control signal so as to control the main switching tube. The power supply control circuit, the power supply control method and the LED drive circuit provided by the invention can solve the problems of power supply and drive voltage control of a plurality of paths of LED drive circuits, simplify the system power supply architecture and effectively save the system cost.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic circuit diagram of a power supply control circuit according to an embodiment of the present invention;
fig. 2 shows a circuit configuration diagram of a power supply control circuit according to still another embodiment of the present invention;
fig. 3 is a schematic circuit diagram of an LED driving circuit according to an embodiment of the present invention;
fig. 4 shows a schematic step diagram of a power supply control method according to an embodiment of the invention.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
The description in this section is for several exemplary embodiments only, and the present invention is not limited only to the scope of the embodiments described. Combinations of different embodiments, and substitutions of features from different embodiments, or similar prior art means may be substituted for or substituted for features of the embodiments shown and described.
The term "coupled" or "connected" in this specification includes both direct and indirect connections. An indirect connection is a connection made through an intermediate medium, such as a conductor, wherein the electrically conductive medium may contain parasitic inductance or parasitic capacitance, or through an intermediate circuit or component as described in the embodiments in the specification; indirect connections may also include connections through other active or passive devices that perform the same or similar function, such as connections through switches, signal amplification circuits, follower circuits, and so on. "plurality" or "plurality" means two or more. In addition, in the present invention, terms such as first and second are mainly used for distinguishing one technical feature from another technical feature, and do not necessarily require or imply any actual relationship or order between the technical features.
The embodiment of the invention discloses a power supply control circuit which comprises a first voltage conversion circuit, a power supply voltage control circuit, a driving voltage control circuit and a switch control circuit. The first voltage conversion circuit is used for converting the first voltage into a power supply voltage to supply power to the power supply control circuit. The input end of the supply voltage control circuit is coupled to the first voltage conversion circuit, and the supply voltage control circuit is used for outputting a first control signal according to the supply voltage so as to control the supply voltage. The input end of the driving voltage control circuit receives a representation signal representing the driving voltage, and the driving voltage control circuit is used for outputting a second control signal according to the representation signal to control the driving voltage. The supply voltage or the drive voltage is used to drive the first load and the drive voltage is used to drive the second load. The first input end of the switch control circuit is coupled with the power supply voltage control circuit, the second input end of the switch control circuit is coupled with the driving voltage control circuit, and the switch control circuit is used for generating a switch driving signal according to the first control signal and the second control signal so as to control the main switching tube. In one embodiment, the characterization signal characterizing the driving voltage is an analog signal. In another embodiment, the characterization signal characterizing the drive voltage is a logic signal.
In an embodiment of the present invention, as shown in fig. 1, the power supply control circuit includes a first voltage conversion circuit 10, a power supply voltage control circuit 11, a drive voltage control circuit 12, and a switch control circuit 13. The driving voltage converting circuit 14 is coupled to the input voltage Vin, and the driving voltage Vbus can be obtained by the driving voltage converting circuit 14. In addition, the first voltage can be obtained by driving the voltage conversion circuit 14, and the first voltage can be controlled by controlling the main switching tube. Preferably, the driving voltage converting circuit includes a rectifying circuit for converting the input voltage Vin of the alternating current into a direct current signal, and a switching converting circuit for converting the direct current signal into the driving voltage Vbus. As shown in fig. 1, an input terminal of the supply voltage control circuit 11 is coupled to the first voltage conversion circuit 10, the first voltage conversion circuit 10 is configured to convert the first voltage into a supply voltage VDD, and the supply voltage VDD is used to supply power to the supply control circuit. The supply voltage control circuit 11 is configured to output a first control signal according to a supply voltage VDD, where the first control signal is used to control and regulate the supply voltage VDD. The input end of the driving voltage control circuit 12 receives a representation signal representing the driving voltage Vbus, and the driving voltage control circuit 12 is configured to output a second control signal according to the representation signal, where the second control signal is used to control and regulate the driving voltage Vbus. The power supply voltage VDD or the driving voltage Vbus is used for driving a first load, and the driving voltage Vbus is used for driving a second load. A first input terminal of the switch control circuit 13 is coupled to the output terminal of the supply voltage control circuit 11, a second input terminal of the switch control circuit 13 is coupled to the output terminal of the driving voltage control circuit 12, and the switch control circuit 13 is configured to generate a switch driving signal according to the first control signal and the second control signal, where the switch driving signal is used to control a switching state of the main switch Q1.
In an embodiment of the present invention, the driving voltage converting circuit may be one of a buck-type switching circuit, a boost-type switching circuit, a buck-type switching circuit, a flyback-type switching circuit, and other topology circuits. In an embodiment of the present invention, the main switch Q1 is disposed in the power supply control circuit. In another embodiment of the present invention, the main switch Q1 is disposed in the driving circuit converting circuit 14, and the main switch Q1 may be disposed according to specific requirements. In a specific embodiment, the main switch tube may be one of a metal oxide semiconductor field effect transistor (MOSFET tube for short), a junction field effect transistor (JFET tube for short) and an insulated gate bipolar transistor (IGBT for short).
In another embodiment of the present invention, as shown in fig. 2, the power supply control circuit includes a first voltage conversion circuit (not shown in the figure), a power supply voltage control circuit, a drive voltage control circuit, and a switch control circuit 23. In a preferred embodiment, the supply voltage control circuit includes a first comparison circuit 21, a first input terminal of the first comparison circuit 21 is coupled to the first reference signal terminal to receive the first reference signal Vref1, a second input terminal of the first comparison circuit 21 is coupled to the supply voltage terminal to receive the supply voltage VDD, and an output terminal of the first comparison circuit 21 outputs the first control signal. In a preferred embodiment, the driving voltage control circuit includes an operational amplifier circuit 22 and a first capacitor C1, a first input terminal of the operational amplifier circuit 22 is coupled to the second reference signal terminal for receiving the second reference signal Vref2, a second input terminal of the operational amplifier circuit 22 is coupled to the characterization signal terminal for receiving the characterization signal Vl fb, and the characterization signal Vl fb is used for characterizing the driving voltage. The first end of the first capacitor C1 is coupled to the output terminal of the operational amplifier circuit 22 and the switch control circuit 23, respectively, and the second end of the first capacitor C1 is coupled to the ground reference. In a preferred embodiment, the switch control circuit 23 includes an on-time control circuit 231 and a switch drive signal generation circuit 232. The first input terminal of the on-time control circuit 231 is coupled to the supply voltage control circuit, the second input terminal of the on-time control circuit 231 is coupled to the driving voltage control circuit, the on-time control circuit 231 controls the on-time of the main switch Q1 according to the first control signal and the second control signal, and controls the on-off state of the main switch Q1 by controlling the on-time of the main switch Q1, so as to control the supply voltage VDD and the driving voltage Vbus, respectively. The input terminal of the switch driving signal generating circuit 232 is coupled to the output terminal of the on-time control circuit 231, the output terminal of the switch driving signal generating circuit 232 is coupled to the control terminal of the main switch Q1, and the switch driving signal generating circuit 232 is configured to output a switch driving signal to drive the main switch Q1.
In a preferred embodiment of the present invention, the driving voltage control circuit includes a first capacitor and a charge and discharge control circuit. The first end of the first capacitor is coupled to the switch control circuit, and the second end of the first capacitor is coupled to the reference ground. The input end of the charge and discharge control circuit is coupled to the characterization signal end LFB to receive the characterization signal, in this embodiment, the characterization signal is a logic signal, the charge and discharge control circuit is configured to control charge and discharge of the first capacitor according to the characterization signal, and the logic signal is configured to control the driving voltage. The logic signal may be obtained from the driving voltage and the reference signal. When the driving voltage is less than the reference signal, the logic signal is at a first logic level; when the driving voltage is greater than the reference signal, the logic signal is at a second logic level. Illustratively, the charge-discharge control circuit controls charging of the first capacitor when the logic signal is at a first logic level (e.g., high level); when the logic signal is at a second logic level (for example, a low level), the charge and discharge control circuit controls to discharge the first capacitor. The first end of the first capacitor outputs a second control signal, and the switch control circuit controls the on-off state of the switch tube according to the second control signal, so that the control of the driving voltage is realized.
The embodiment of the invention discloses an LED driving circuit, which comprises a driving voltage conversion circuit and the power supply control circuit, wherein the driving voltage output by the driving voltage conversion circuit is controlled by controlling the on-off state of a main switching tube. In an embodiment of the present invention, as shown in fig. 3, the LED driving circuit includes a driving voltage converting circuit, a power supply control circuit, and a load. The drive circuit conversion circuit comprises a rectification circuit and a switch conversion circuit, and the rectification circuit is a rectifier bridge circuit. In the embodiment shown in fig. 3, the switching converter circuit is a boost switching circuit, but a suitable topology circuit may be selected according to actual circuit requirements. The boost switch circuit includes a first inductor L1, a first diode D1, a main switch Q1 (not shown), and a second capacitor C2. A first terminal of the first inductor L1 is coupled to the rectifying circuit, an anode of the first diode D1 is coupled to the second terminal of the first inductor L1, a first terminal of the second capacitor C2 is coupled to a cathode of the first diode D1, and a second terminal of the second capacitor C2 is coupled to ground. The power supply control circuit comprises a first chip, wherein a main switching tube Q1 is arranged in the first chip, and the first chip is provided with a drain terminal pin, a current sampling pin and a power supply voltage terminal pin. Preferably, the main switch transistor is a field effect transistor, the drain of the main switch transistor Q1 is coupled to the drain pin of the first chip, and the source of the main switch transistor Q1 is coupled to the current sampling pin. The power supply control circuit comprises a first voltage conversion circuit, a power supply voltage control circuit, a driving voltage control circuit and a switch control circuit.
Preferably, in an embodiment, the first voltage conversion circuit includes an auxiliary winding L2, and the first voltage conversion circuit converts the first voltage into a supply voltage and outputs the supply voltage to the supply voltage terminal pin. Specifically, the first voltage may be obtained from the driving voltage conversion circuit. The power supply voltage control circuit outputs a first control signal according to the power supply voltage to control the power supply voltage, and the driving voltage control circuit outputs a second control signal according to a representation signal representing the driving voltage to control the driving voltage. The switch control circuit generates a switch driving signal according to the first control signal and the second control signal, and the switch driving signal is used for controlling the on-off state of the main switching tube. The driving voltage Vbus output by the driving voltage conversion circuit can be controlled by controlling the switching state of the main switching tube. In the embodiment shown in fig. 3, the load includes a string of RGB lights, a string of cold white lights, and a string of warm white lights. The supply voltage VDD is used to supply power to the power supply control circuit, and in addition, the supply voltage VDD is also used to drive the RGB light string. The driving voltage Vbus is used to drive the cold white light string and the warm white light string.
In a preferred embodiment, as shown in fig. 3, the LED driving circuit further includes a dimming module for performing dimming control on the RGB light string, the cold-white light string and the warm-white light string according to the control signal obtained from the communication module. The communication module can be one of the communication modules such as a Bluetooth module, a Zigbee module and a Wifi module. In the embodiment shown in fig. 3, the communication module sends an I2C signal to the dimming module, and the dimming module performs dimming control on the RGB string lights, the cold white string lights and the warm white string lights according to the I2C signal. Preferably, the dimming module may be powered by the supply voltage VDD or the driving voltage Vbus. Preferably, the power supply control circuit further includes a second voltage conversion circuit, an input terminal of the second voltage conversion circuit is coupled to the power supply voltage terminal to receive the power supply voltage, and the second voltage conversion circuit is configured to convert the power supply voltage into a second voltage, so as to supply power to the communication module.
In an embodiment of the invention, the supply voltage control circuit is configured to control the driving voltage converting circuit to operate in an increased power output mode when the supply voltage is lower than the third reference signal, the increased power output mode includes a peak-fixing mode or controls charging of a control loop of the driving voltage converting circuit, the increased power output mode may further include the peak-fixing mode and controls charging of the control loop of the driving voltage converting circuit, and the driving voltage converting circuit is controlled to operate in the increased power output mode to increase output energy of the driving voltage converting circuit, so as to increase the supply voltage value. The peak-fixed mode is specifically that the current flowing through the first inductor is controlled in the peak mode or the current flowing through the main switching tube is the peak current value.
In an embodiment of the invention, the supply voltage is used to drive a first load, and the driving voltage is used to drive a second load. The first load is RGB lamp string, and the second load is cold white lamp string and warm white lamp string.
In another embodiment of the present invention, the driving voltage is used to drive the first load and the second load. The first load is RGB lamp string, and the second load is cold white lamp string and warm white lamp string.
An embodiment of the present invention further discloses a power supply control method, as shown in fig. 4, the power supply control method includes:
step S100, converting the first voltage into a power supply voltage to supply power to a power supply control circuit;
step S200, outputting a first control signal according to the power supply voltage to control the power supply voltage;
step S300, outputting a second control signal according to the representation signal representing the driving voltage so as to control the driving voltage; the power supply voltage or the driving voltage is used for driving a first load, and the driving voltage is used for driving a second load; and
and S400, generating a switch driving signal according to the first control signal and the second control signal so as to control a main switching tube.
In a preferred embodiment of the present invention, the step of outputting the first control signal according to the supply voltage comprises: the first reference signal is compared to the supply voltage to generate a first control signal.
In a preferred embodiment of the present invention, the step of outputting the second control signal according to the characterization signal characterizing the driving voltage comprises: and generating a second control signal according to the second reference signal and the characterization signal, wherein the characterization signal is an analog signal. In another embodiment, the step of outputting the second control signal according to the characterization signal characterizing the driving voltage comprises: and controlling the charging and discharging of the first capacitor according to the characterization signal, obtaining a second control signal through the first end of the first capacitor, wherein the characterization signal is a logic signal, and the second end of the first capacitor is coupled to the ground.
In a preferred embodiment of the present invention, the power supply control method further includes: and converting the power supply voltage into a second voltage to supply power to the communication module.
In a preferred embodiment of the present invention, the power supply control method further includes: and when the power supply voltage is lower than the third reference signal, controlling the driving voltage conversion circuit to work in an increased power output mode, wherein the increased power output mode comprises a fixed peak value mode or a mode for controlling the charging of a control loop of the driving voltage conversion circuit, the increased power output mode also comprises a fixed peak value mode and a mode for controlling the charging of the control loop of the driving voltage conversion circuit, and the driving voltage conversion circuit is controlled to work in the increased power output mode to increase the output energy of the driving voltage conversion circuit.
In a preferred embodiment of the present invention, the supply voltage is used to drive a first load, the driving voltage is used to drive a second load, the first load is an RGB string light, and the second load is a cold white string light and a warm white string light.
In a preferred embodiment of the present invention, the driving voltage is used to drive a first load and a second load, the first load is an RGB light string, and the second load is a cold white light string and a warm white light string.
The invention provides a power supply control circuit, a power supply control method and an LED drive circuit, wherein the power supply control circuit comprises a first voltage conversion circuit, a power supply voltage control circuit, a drive voltage control circuit and a switch control circuit. The first voltage conversion circuit is used for converting the first voltage into a power supply voltage to supply power to the power supply control circuit. The input end of the supply voltage control circuit is coupled to the first voltage conversion circuit, and the supply voltage control circuit is used for outputting a first control signal according to the supply voltage so as to control the supply voltage. The input end of the driving voltage control circuit receives a representation signal representing the driving voltage, and the driving voltage control circuit is used for outputting a second control signal according to the representation signal to control the driving voltage. The supply voltage or the drive voltage is used to drive the first load and the drive voltage is used to drive the second load. The first input end of the switch control circuit is coupled with the power supply voltage control circuit, the second input end of the switch control circuit is coupled with the driving voltage control circuit, and the switch control circuit is used for generating a switch driving signal according to the first control signal and the second control signal so as to control the main switching tube. The power supply control circuit, the power supply control method and the LED drive circuit provided by the invention can solve the problems of power supply and drive voltage control of a plurality of paths of LED drive circuits, simplify the system power supply architecture and effectively save the system cost.
Those skilled in the art should understand that the logic controls such as "high" and "low", "set" and "reset", "and gate" and "or gate", "non-inverting input" and "inverting input" in the logic controls referred to in the specification or the drawings may be exchanged or changed, and the subsequent logic controls may be adjusted to achieve the same functions or purposes as the above-mentioned embodiments.
The description and applications of the invention herein are illustrative and are not intended to limit the scope of the invention to the embodiments described above. The descriptions related to the effects or advantages in the specification may not be reflected in practical experimental examples due to uncertainty of specific condition parameters or influence of other factors, and the descriptions related to the effects or advantages are not used for limiting the scope of the invention. Variations and modifications of the embodiments disclosed herein are possible, and alternative and equivalent various components of the embodiments will be apparent to those skilled in the art. It will be clear to those skilled in the art that the present invention may be embodied in other forms, structures, arrangements, proportions, and with other components, materials, and parts, without departing from the spirit or essential characteristics thereof. Other variations and modifications of the embodiments disclosed herein may be made without departing from the scope and spirit of the invention.

Claims (18)

1. A power supply control circuit, characterized in that the power supply control circuit comprises:
the first voltage conversion circuit is used for converting the first voltage into a power supply voltage so as to supply power to the power supply control circuit;
a supply voltage control circuit, an input terminal of which is coupled to the first voltage conversion circuit, for outputting a first control signal according to a supply voltage to control the supply voltage;
the input end of the driving voltage control circuit receives a representation signal representing the driving voltage and is used for outputting a second control signal according to the representation signal so as to control the driving voltage; the power supply voltage or the driving voltage is used for driving the first load, and the driving voltage is used for driving the second load; and
and the first input end of the switch control circuit is coupled with the power supply voltage control circuit, and the second input end of the switch control circuit is coupled with the driving voltage control circuit and used for generating a switch driving signal according to the first control signal and the second control signal so as to control the main switching tube.
2. The supply control circuit of claim 1, wherein the supply voltage control circuit comprises:
a first input terminal of the first comparison circuit is coupled to the first reference signal terminal for receiving the first reference signal, a second input terminal of the first comparison circuit is coupled to the power supply voltage terminal for receiving the power supply voltage, and an output terminal of the first comparison circuit outputs a first control signal.
3. The power supply control circuit of claim 1 wherein the characterization signal is an analog signal, the drive voltage control circuit comprising:
an operational amplifier circuit, a first input terminal of which is coupled to the second reference signal terminal for receiving the second reference signal, and a second input terminal of which is coupled to the characterization signal terminal for receiving the characterization signal; and
the first end of the first capacitor is respectively coupled with the output end of the operational amplifier circuit and the switch control circuit, and the second end of the first capacitor is coupled with the reference ground.
4. The power supply control circuit of claim 1 wherein the characterization signal is a logic signal, the drive voltage control circuit comprising:
a first capacitor, a first end of which is coupled to the switch control circuit, and a second end of which is coupled to the reference ground; and
and the input end of the charging and discharging control circuit is coupled with the representation signal end to receive the representation signal and is used for controlling the charging and discharging of the first capacitor according to the representation signal.
5. The power supply control circuit of claim 1, wherein the switch control circuit comprises:
the first input end of the conduction time control circuit is coupled with the power supply voltage control circuit, and the second input end of the conduction time control circuit is coupled with the driving voltage control circuit and used for controlling the conduction time of the main switching tube according to a first control signal and a second control signal; and
and the input end of the switch driving signal generating circuit is coupled with the output end of the conduction time control circuit, and the output end of the switch driving signal generating circuit is coupled with the main switching tube and used for outputting a switch driving signal.
6. The power supply control circuit of claim 1 wherein the first voltage conversion circuit includes an auxiliary winding, the first voltage being converted to the supply voltage by the first voltage conversion circuit.
7. The power supply control circuit of claim 1, further comprising:
and the input end of the second voltage conversion circuit is coupled with the power supply voltage end to receive the power supply voltage, and the second voltage conversion circuit is used for converting the power supply voltage into a second voltage to supply power to the communication module.
8. An LED driving circuit, characterized in that the LED driving circuit comprises a driving voltage conversion circuit and a power supply control circuit as claimed in any one of claims 1-7, and the driving voltage output by the driving voltage conversion circuit is controlled by controlling the switching state of the main switching tube.
9. The LED driving circuit as claimed in claim 8, wherein the supply voltage control circuit is configured to control the driving voltage converting circuit to operate in a power-up output mode to increase the output energy of the driving voltage converting circuit when the supply voltage is lower than the third reference signal.
10. The LED driving circuit according to claim 8, wherein the supply voltage is used to drive a first load, and the driving voltage is used to drive a second load; the first load is an RGB lamp string, and the second load is a cold white lamp string and a warm white lamp string.
11. The LED driving circuit according to claim 8, wherein the driving voltage is used to drive a first load and a second load; the first load is an RGB lamp string, and the second load is a cold white lamp string and a warm white lamp string.
12. A power supply control method, characterized by comprising:
converting the first voltage into a supply voltage to supply power to the power supply control circuit;
outputting a first control signal according to the power supply voltage to control the power supply voltage;
outputting a second control signal according to the representation signal representing the driving voltage so as to control the driving voltage; the power supply voltage or the driving voltage is used for driving a first load, and the driving voltage is used for driving a second load; and
and generating a switch driving signal according to the first control signal and the second control signal so as to control a main switching tube.
13. The power supply control method of claim 12, wherein the step of outputting the first control signal according to the power supply voltage comprises: the first reference signal is compared to the supply voltage to generate a first control signal.
14. The power supply control method of claim 12 wherein the step of outputting the second control signal in response to the characterization signal indicative of the drive voltage comprises:
generating a second control signal according to the second reference signal and the characterization signal, wherein the characterization signal is an analog signal; or
And controlling the charging and discharging of the first capacitor according to the characterization signal, and obtaining a second control signal through the first end of the first capacitor, wherein the characterization signal is a logic signal.
15. The power supply control method according to claim 12, characterized by further comprising: and converting the power supply voltage into a second voltage to supply power to the communication module.
16. The power supply control method according to claim 12, characterized by further comprising: and when the power supply voltage is lower than the third reference signal, controlling the driving voltage conversion circuit to work in a power output increasing mode so as to increase the output energy of the driving voltage conversion circuit.
17. The power supply control method of claim 12 wherein the supply voltage is used to drive a first load, the drive voltage is used to drive a second load, the first load is a string of RGB lights, and the second load is a string of cold white lights and a string of warm white lights.
18. The power supply control method of claim 12, wherein the driving voltage is used to drive a first load and a second load, the first load is an RGB string light, and the second load is a cold white string light and a warm white string light.
CN202110952692.XA 2021-08-19 2021-08-19 Power supply control circuit, power supply control method and LED drive circuit Pending CN113556845A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115037164A (en) * 2022-08-12 2022-09-09 杰华特微电子股份有限公司 Switch converter with wide-range output and control method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115037164A (en) * 2022-08-12 2022-09-09 杰华特微电子股份有限公司 Switch converter with wide-range output and control method thereof

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