CN110391751A - Double feedback digital power circuits and power supply - Google Patents

Double feedback digital power circuits and power supply Download PDF

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Publication number
CN110391751A
CN110391751A CN201910724609.6A CN201910724609A CN110391751A CN 110391751 A CN110391751 A CN 110391751A CN 201910724609 A CN201910724609 A CN 201910724609A CN 110391751 A CN110391751 A CN 110391751A
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CN
China
Prior art keywords
circuit
connect
voltage signal
separately
unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910724609.6A
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Chinese (zh)
Inventor
郭振宇
蔡胜平
韦宗旺
周建华
姚志忠
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Skyworth RGB Electronics Co Ltd
Shenzhen Chuangwei RGB Electronics Co Ltd
Original Assignee
Shenzhen Chuangwei RGB Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Shenzhen Chuangwei RGB Electronics Co Ltd filed Critical Shenzhen Chuangwei RGB Electronics Co Ltd
Priority to CN201910724609.6A priority Critical patent/CN110391751A/en
Publication of CN110391751A publication Critical patent/CN110391751A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/22Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33515Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with digital control
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/22Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/22Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/0083Converters characterised by their input or output configuration
    • H02M1/009Converters characterised by their input or output configuration having two or more independently controlled outputs
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The invention discloses a kind of double feedback digital power circuits and power supplys.The present invention is separately connected by feed circuit and resonance circuit, digit chip, mainboard and LED light, obtains the output voltage signal of resonance circuit, and send and output voltage signal to digit chip;Digit chip is connect with resonance circuit, receives output voltage signal, and according to output voltage signal to resonance circuit output drive signal;Resonance circuit is connect with circuit of power factor correction, receives the input signal of driving signal and circuit of power factor correction transmission, and be input to the voltage constant pressure of the LED light and the voltage constant pressure of the mainboard according to driving signal and input signal control.Wherein, resonance circuit is obtained by feed circuit to export to mainboard and the output voltage signal of LED light two FB feedback control loops of formation, realize control of the digit chip to the output voltage of resonance circuit, to which the stable regulation of two output voltage can be completed using resonance circuit all the way, power density is increased.

Description

Double feedback digital power circuits and power supply
Technical field
The present invention relates to power technique fields more particularly to a kind of double feedback digital power circuits and power supply.
Background technique
Switching Power Supply is the time ratio that control switch pipe turns on and off using modern power electronics technology, to maintain A kind of power supply stabilized the output voltage, Switching Power Supply is generally by PWM (Pulse Width Modulation, pulse width modulation) Control.It is also innovated with the development of power electronics technology constantly with innovation, switch power technology, PFC (Power Factor Correction, PFC) power source design of circuit+LLC (resonance) circuit answered extensively in LED power occasion With.
It is independently-powered to mainboard and lamp bar in order to meet in the Switching Power Supply of current electronic equipment, at least need two Power-switching circuit is such as main board power supply usually using LLC circuit, increases Boost/Buck (step-up/down) circuit and drive It moves as lamp bar power supply;Or by main LLC circuit be that lamp bar is powered, realize the constant current of lamp bar, it is (straight by increasing DC-DC Stream-direct current) circuit be main board power supply.These design scheme power density are low, circuit structure is complicated.
Above content is only used to facilitate the understanding of the technical scheme, and is not represented and is recognized that above content is existing skill Art.
Summary of the invention
The main purpose of the present invention is to provide a kind of double feedback digital power circuits and power supplys, it is intended to solve the prior art The technical issues of middle Switching Power Supply power density is low and structure is complicated.
To achieve the above object, the present invention provides a kind of double feedback digital power circuits, the circuit include resonance circuit, Feed circuit and digit chip;Wherein,
The feed circuit is separately connected, for obtaining with the resonance circuit, the digit chip, mainboard and LED light The output voltage signal of the resonance circuit, and the digit chip is outputed voltage signal to described in transmission;
The digit chip is connect with the resonance circuit, for receiving the output voltage signal, and according to described defeated Voltage signal is to the resonance circuit output drive signal out;
The resonance circuit, connect with circuit of power factor correction, for receive the driving signal and the power because The input signal that number correcting circuit is sent, and the LED light is input to according to the driving signal and input signal control Voltage constant pressure and the mainboard voltage constant pressure.
Preferably, the resonance circuit includes resonance conversion unit, rectification filtering unit and sampling unit;Wherein,
The resonance conversion unit, with the circuit of power factor correction, the digit chip and the rectifying and wave-filtering list Member is separately connected, and is believed for receiving the driving signal and the input signal, and according to the driving signal and the input First voltage signal, second voltage signal, tertiary voltage signal to the rectification filtering unit are exported number respectively;
The rectification filtering unit, with the sampling unit, the feed circuit, the mainboard, the LED light and power amplifier It is separately connected, it is whole for carrying out the first voltage signal, the second voltage signal and the tertiary voltage signal respectively Correspondence is sent to the mainboard and the feed circuit, the LED light and the sampling unit, the power amplifier and institute after stream filtering State feed circuit;
The sampling unit is separately connected with the LED light and the feed circuit, for according to after rectifying and wave-filtering Two voltage signals sample the input voltage of the LED light, obtain and send sampled voltage signal to the feed circuit.
Preferably, the resonance conversion unit include the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, inductance, transformer, electrolytic capacitor, Parasitic capacitance and resonant capacitance;Wherein,
The first end of the electrolytic capacitor and the drain electrode of the circuit of power factor correction and first metal-oxide-semiconductor connect respectively It connects, the second end of the electrolytic capacitor and the source electrode of the circuit of power factor correction and second metal-oxide-semiconductor are separately connected;
The grid of first metal-oxide-semiconductor is connect with the digit chip, the source electrode of first metal-oxide-semiconductor and described second The drain electrode of metal-oxide-semiconductor, the first end of the inductance, the first end of the parasitic capacitance are separately connected;
The drain electrode of second metal-oxide-semiconductor is separately connected with the first end of the inductance and the first end of the parasitic capacitance, The grid of second metal-oxide-semiconductor is connect with the digit chip, the source electrode of second metal-oxide-semiconductor and the second of the parasitic capacitance The first end of end and the resonant capacitance is separately connected;
The second end of the inductance is connect with the first end of the primary coil of the transformer;
The second end of the resonant capacitance is connect with the second end of the primary coil of the transformer;
The first secondary coil, second subprime coil and the third secondary coil of the transformer with the rectifying and wave-filtering list Member connection.
Preferably, the rectification filtering unit include first diode, the second diode, third diode, first capacitor, Second capacitor and third capacitor;Wherein,
The anode of the first diode is connect with the first end of first secondary coil, the yin of the first diode Pole and first end, the mainboard and the feed circuit of the first capacitor are separately connected;
The second end of the first capacitor is separately connected with the second end of first secondary coil and the mainboard;
The anode of second diode is connect with the first end of the second subprime coil, the yin of second diode Pole is separately connected with the first end of second capacitor and the LED light;
The second end of second capacitor is separately connected with the second end of the second subprime coil and the sampling unit;
The anode of the third diode is connect with the first end of the third secondary coil, the yin of the third diode Pole and first end, the power amplifier and the feed circuit of the third capacitor are separately connected;
The second end of the third capacitor is separately connected with the second end of the third secondary coil and the power amplifier.
Preferably, the first end of the primary coil and the first end of first secondary coil, the second subprime line The second end of circle, the first end of the third secondary coil Same Name of Ends each other.
Preferably, the sampling unit includes sampling resistor, the first end of the sampling resistor and the second subprime line The second end of circle connects, and the second end of the sampling resistor is separately connected with the feed circuit and the LED light.
Preferably, the feed circuit includes the first feedback unit and the second feedback unit;Wherein,
The first end and the third secondary coil of the input terminal of first feedback unit and first secondary coil First end be separately connected, the output end of first feedback unit is connect with the digit chip, first feedback unit, For receiving the tertiary voltage signal after first voltage signal and rectifying and wave-filtering after rectifying and wave-filtering, and will be after the rectifying and wave-filtering First voltage signal and rectifying and wave-filtering after tertiary voltage signal be sent to the digit chip;
The input terminal of second feedback unit is connect with the second end of the sampling resistor, second feedback unit Output end is connect with the digit chip, is sent to for receiving the sampled voltage signal, and by the sampled voltage signal The digit chip.
It preferably, further include rectification circuit and circuit of power factor correction;Wherein,
The rectification circuit is connect with the circuit of power factor correction and AC power source, for being converted to surely alternating current Fixed direct current, and direct current signal is exported to the circuit of power factor correction;
The circuit of power factor correction is connect with the resonance circuit, for by the direct current signal carry out power because Number correction, and input signal is sent to the resonance circuit.
Preferably, the rectification circuit includes filter unit and rectifier bridge;The filter unit and the AC power source connect It connects, the rectifier bridge is separately connected with the filter unit and the circuit of power factor correction.
The present invention also proposes that a kind of double feedback digital power supplys, double feedback digital power supplys include double feedbacks as described above Digital power circuit.
The present invention is separately connected by feed circuit and resonance circuit, digit chip, mainboard and LED light, obtains resonance electricity The output voltage signal on road, and send and output voltage signal to digit chip;Digit chip is connect with resonance circuit, receives output Voltage signal, and according to output voltage signal to resonance circuit output drive signal;Resonance circuit and circuit of power factor correction Connection receives the input signal of driving signal and circuit of power factor correction transmission, and according to driving signal and input signal control System is input to the voltage constant pressure of the LED light and the voltage constant pressure of the mainboard.Wherein, resonance circuit is obtained by feed circuit Output to mainboard and the output voltage signal of LED light forms two FB feedback control loops, realizes digit chip to resonance electricity The control of the output voltage on road is increased to can be completed the stable regulation of two output voltage using resonance circuit all the way Power density, and compared with the prior art circuit structure is more simple.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is a kind of functional schematic of double one embodiments of feedback digital power circuit of the present invention;
Fig. 2 is a kind of structural schematic diagram of double one embodiments of feedback digital power circuit of the present invention;
Fig. 3 is the structural schematic diagram of the first feedback unit in a kind of double one embodiments of feedback digital power circuit of the present invention;
Fig. 4 is the structural schematic diagram of the second feedback unit in a kind of double one embodiments of feedback digital power circuit of the present invention.
Drawing reference numeral explanation:
Label Title Label Title
100 Feed circuit Q1~Q2 First triode to the second triode
110 First feedback unit Crv Parasitic capacitance
120 Second feedback unit Cri Resonant capacitance
200 Resonance circuit C0 Electrolytic capacitor
210 Resonance conversion unit D1~D4 First diode is to the 4th diode
220 Rectification filtering unit C1~C12 First capacitor is to the 12nd capacitor
230 Sampling unit RS Sampling resistor
300 Mainboard R1~R17 First resistor is to the 17th resistance
400 LED light T Transformer
500 Circuit of power factor correction U1 First optocoupler
600 Power amplifier U2 First voltage stabilizing chip
700 Rectification circuit U3 Second optocoupler
710 Alternating current-direct current shifting conversion unit U4 Second voltage stabilizing chip
720 Rectifier bridge ZD1~ZD3 First zener diode is to third zener diode
Lr Inductance GND Ground
IC Digit chip
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that if relating to directionality instruction (such as up, down, left, right, before and after ...) in the embodiment of the present invention, Then directionality instruction be only used for explain under a certain particular pose (as shown in the picture) between each component relative positional relationship, Motion conditions etc., if the particular pose changes, directionality instruction is also correspondingly changed correspondingly.
In addition, being somebody's turn to do " first ", " second " etc. if relating to the description of " first ", " second " etc. in the embodiment of the present invention Description be used for description purposes only, be not understood to indicate or imply its relative importance or implicitly indicate indicated skill The quantity of art feature." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one spy Sign.It in addition, the technical solution between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy It is enough realize based on, will be understood that the knot of this technical solution when conflicting or cannot achieve when occurs in the combination of technical solution Conjunction is not present, also not the present invention claims protection scope within.
The present invention provides a kind of double feedback digital power circuits.
Referring to Fig.1, in one embodiment, the circuit includes resonance circuit 200, feed circuit 100 and digit chip IC; Wherein, the feed circuit 100 is separately connected with the resonance circuit 200, digit chip IC, mainboard 300 and LED light 400, The digit chip IC is outputed voltage signal to for obtaining the output voltage signal of the resonance circuit 200, and described in transmission; The digit chip IC is connect with the resonance circuit 200, for receiving the output voltage signal, and according to the output Voltage signal is to 200 output drive signal of resonance circuit;The resonance circuit 200 connects with circuit of power factor correction 500 It connects, for receiving the input signal of the driving signal and the transmission of the circuit of power factor correction 500, and according to the driving Signal and input signal control are input to the voltage constant pressure of the LED light 400 and the voltage constant pressure of the mainboard 300.
It should be noted that in traditional circuit realize LED light and mainboard it is independently-powered need using two-way power supply convert electricity Road improves conventional resonant circuit 200 in the present embodiment, and by feed circuit 100 from improved resonance circuit The output voltage signal for being sent to LED light 400 and mainboard 300 is taken out in 200, and duty ratio and frequency are changed by digit chip IC Two output voltage is adjusted, realizes the independent control of two-way output.
Further, double feedback digital power circuits further include rectification circuit 700 and circuit of power factor correction 500;Wherein, the rectification circuit 700 is connect with the circuit of power factor correction 500 and AC power source, for turning alternating current It is changed to stable DC, and exports direct current signal to the circuit of power factor correction 500;The circuit of power factor correction 500, it is connect with the resonance circuit 200, for the direct current signal to be carried out PFC, and sends input signal extremely The resonance circuit 200.
Further, the rectification circuit 700 includes filter unit 710 and rectifier bridge 720;The filter unit 710 with The AC power source connection, the rectifier bridge 720 are distinguished with the filter unit 710 and the circuit of power factor correction 500 Connection.
It should be understood that rectification circuit 700 receives the alternating voltage from alternating current, which is converted into direct current Voltage is simultaneously sent to circuit of power factor correction 500 after being rectified.
The present embodiment is separately connected by feed circuit and resonance circuit, digit chip, mainboard and LED light, obtains resonance The output voltage signal of circuit, and send and output voltage signal to digit chip;Digit chip is connect with resonance circuit, is received defeated Voltage signal out, and according to output voltage signal to resonance circuit output drive signal;Resonance circuit and PFC electricity Road connection receives the input signal of driving signal and circuit of power factor correction transmission, and according to driving signal and input signal Control is input to the constant pressure of the constant pressure of the voltage of the LED light and the voltage of the mainboard.Wherein, it is obtained by feed circuit humorous Circuit output of shaking to mainboard and the output voltage signal of LED light forms two FB feedback control loops, realizes digit chip pair The control of the output voltage of resonance circuit is adjusted to can complete stablizing for two output voltage using resonance circuit all the way Section increases power density, and compares existing circuit structure, and this programme structure is more simple.
Please with reference to Fig. 1 and Fig. 2, the resonance circuit 200 includes resonance conversion unit 210, rectification filtering unit 220 And sampling unit 230;Wherein, the resonance conversion unit 210, with the circuit of power factor correction 500, the digit chip IC and the rectification filtering unit 220 are separately connected, for receiving the driving signal and the input signal, and according to described Driving signal and the input signal export first voltage signal, second voltage signal, tertiary voltage signal to described whole respectively Flow filter unit 220;The rectification filtering unit 220, with the sampling unit 230, the feed circuit 100, the mainboard 300, the LED light 400 and power amplifier 600 are separately connected, and are used for the first voltage signal, the second voltage signal and institute It states tertiary voltage signal and carries out the corresponding mainboard 300 and the feed circuit 100, described of being sent to after rectifying and wave-filtering respectively LED light 400 and the sampling unit 230, the power amplifier 600 and the feed circuit 100;The sampling unit 230, and it is described LED light 400 and the feed circuit 100 are separately connected, for according to the second voltage signal after rectifying and wave-filtering to the LED light 400 input voltage is sampled, and is obtained and is sent sampled voltage signal to the feed circuit 100.
Specifically, the resonance conversion unit 210 include the first metal-oxide-semiconductor Q1, the second metal-oxide-semiconductor Q2, inductance Lr, transformer T, Electrolytic capacitor C0, parasitic capacitance Crv and resonant capacitance Cri;Wherein, the first end Yu the power factor of the electrolytic capacitor C0 The drain electrode of correcting circuit 500 and the first metal-oxide-semiconductor Q1 are separately connected, the second end of the electrolytic capacitor C0 and the power because The source electrode of number correcting circuit 500 and the second metal-oxide-semiconductor Q2 are separately connected;The grid of the first metal-oxide-semiconductor Q1 and the number Chip IC connection, the drain electrode of the source electrode of the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2, the first end of the inductance Lr, institute The first end for stating parasitic capacitance Crv is separately connected;The drain electrode of the second metal-oxide-semiconductor Q2 and the first end of the inductance Lr and described The first end of parasitic capacitance Crv is separately connected, and the grid of the second metal-oxide-semiconductor Q2 is connect with the digit chip IC, and described The source electrode of two metal-oxide-semiconductor Q2 is separately connected with the second end of the parasitic capacitance Crv and the first end of the resonant capacitance Cri;Institute The second end for stating inductance Lr is connect with the first end of the primary coil of the transformer T;The second end of the resonant capacitance Cri with The second end of the primary coil of the transformer T connects;The first secondary coil, the second subprime coil and of the transformer T Three secondary coils are connect with the rectification filtering unit 220.
It should be understood that since the voltage that circuit of power factor correction 500 exports is usually 380V-400V, in order to right The input of resonance conversion unit 210 carries out pressure stabilizing, needs to increase the biggish electrolytic capacitor C0 of a capacitance.
It should be noted that digit chip IC is by control duty, when switching frequency controls the first metal-oxide-semiconductor Q1 and second The conducting and disconnection of metal-oxide-semiconductor Q2.When the first metal-oxide-semiconductor Q1 conducting, resonant capacitance Cri storage energy, when the second metal-oxide-semiconductor Q2 is connected When, resonant capacitance Cri releases energy, and exports constant pressure to LED light 400 to realize, and export constant pressure to mainboard 300, ensures defeated Stability out.As one embodiment, when double feedback digital power circuits are applied to TV power supply occasion, mainboard 300 Output voltage be 12V, while the output voltage of power amplifier 600 be 20V.
Further, the rectification filtering unit 220 includes first diode D1, the second diode D2, third diode D3, first capacitor C1, the second capacitor C2 and third capacitor C3;Wherein, the anode of the first diode D1 and the first time The first end connection of grade coil, first end, the mainboard 300 of the cathode of the first diode D1 and the first capacitor C1 And the feed circuit 100 is separately connected;The second end of the second end of the first capacitor C1 and first secondary coil and The mainboard 300 is separately connected;The anode of the second diode D2 is connect with the first end of the second subprime coil, described The cathode of second diode D2 and the first end and the LED light 400 of the second capacitor C2 are separately connected;Second capacitor The second end of C2 and the second end and the sampling unit 230 of the second subprime coil are separately connected;The third diode The anode of D3 is connect with the first end of the third secondary coil, the cathode of the third diode D3 and the third capacitor C3 First end, the power amplifier 600 and the feed circuit 100 be separately connected;The second end of the third capacitor C3 and described the The second end of three secondary coils and the power amplifier 600 are separately connected.
It should be noted that the first end of the primary coil and the first end of first secondary coil, described second The second end of secondary coil, the first end of the third secondary coil Same Name of Ends each other, in this way, when the first metal-oxide-semiconductor Q1 conducting, For electric current by the first end of primary coil to secondary Same Name of Ends, first diode D1 and third diode D3 conducting, resonance are electric Road 200 to 300 output voltage of mainboard, meanwhile, the second diode D2 cut-off, feed circuit 100 by sampling unit 230 sampling obtain It is transferred to digit chip IC after obtaining sampled voltage signal, digit chip IC stablizes LED light voltage by adjusting driving signal.
Further, the sampling unit 230 includes sampling resistor RS, the first end of the sampling resistor RS and described the The second end of secondary stage coil connects, the second end of the sampling resistor RS and the feed circuit 100 and the LED light 400 It is separately connected.
It should be understood that sampling by input voltage of the sampling resistor RS to LED light 400, sampled voltage is obtained Sampled voltage signal is simultaneously fed back to digit chip IC by signal, so that digit chip IC calculates the voltage for flowing through LED light 400, and Isobarically Control is carried out to LED light 400.
Further, the feed circuit 100 includes the first feedback unit 110 and the second feedback unit 120;Wherein, institute State the first end of the input terminal of the first feedback unit 100 and the first end of first secondary coil and the third secondary coil It being separately connected, the output end of first feedback unit 110 is connect with the digit chip IC, first feedback unit 110, For receiving the tertiary voltage signal after first voltage signal and rectifying and wave-filtering after rectifying and wave-filtering, and will be after the rectifying and wave-filtering First voltage signal and rectifying and wave-filtering after tertiary voltage signal be sent to the digit chip IC;Second feedback unit 120 input terminal is connect with the second end of the sampling resistor RS, the output end of second feedback unit 120 and the number Chip IC connection, is sent to the digit chip IC for receiving the sampled voltage signal, and by the sampled voltage signal.
As one embodiment, please with reference to Fig. 3, the first feedback unit 110 may include the 4th capacitor C4, the 5th electricity Hold C5, the 6th capacitor C6, the 7th capacitor C7, the 8th capacitor C8, first resistor R1, second resistance R2,3rd resistor R3, the 4th electricity Hinder R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the 4th diode D4, first Optocoupler U1 and the first voltage stabilizing chip U2, the first feedback unit 110, the connection relationship of each element also may refer to Fig. 3, do not make herein It repeats.It should also be noted that, wherein the first feedback unit 110 by the first voltage stabilizing chip U2 control flow through the first optocoupler U1's The size of electric current, and then the first voltage signal after rectifying and wave-filtering and the tertiary voltage signal after rectifying and wave-filtering through the first optocoupler The controlled end of U1 is transmitted to digit chip IC.
As another embodiment, please together referring to Fig. 4, the second feedback unit 120 may include the 9th capacitor C9, the tenth electricity It is steady to hold C10, the 11st capacitor C11, the 12nd capacitor C12, the first zener diode ZD1, the second zener diode ZD2, third Press diode ZD3, the tenth resistance R10, eleventh resistor R11, twelfth resistor R12, thirteenth resistor R13, the 14th resistance R14, the 15th resistance R15, the 16th resistance R16, the 17th resistance R17, the second optocoupler U3 and the second voltage stabilizing chip U4, second The connection relationship of feedback unit 120, each element is also referred to Fig. 4, and therefore not to repeat here.It should also be noted that, wherein the Two feedback units 120 flow through the size of the electric current of the second optocoupler U3 by the second voltage stabilizing chip U4 control, and then sampled voltage Signal is transmitted to digit chip IC through the controlled end of the second optocoupler U3.
The present embodiment is by the specific design of resonance circuit and feed circuit, according to the characteristics of transformer and digit chip High-speed computation ability solves the problems, such as the unbalance loading of output voltage, realizes the adjusting to two output voltage, and ensured that two-way is defeated The dynamic stability of voltage out.
Hereinafter, illustrating the working principle of the present embodiment in conjunction with Fig. 1 to Fig. 4:
When the conducting of the upper tube (i.e. the first MOST pipe Q1) of resonance circuit 200, first diode D1 and third diode D3 Conducting, resonant capacitance Cri storage energy, secondary Same Name of Ends transmit energy, mainboard 300 and power amplifier to Vout1 and Vout3 at this time 600 obtain stable voltage, and when load down, the meeting big ups and downs of Vout2 voltage cause LED light 400 to flash, by LED The input voltage of lamp 400 is sampled, and is transferred to digit chip by the first feedback unit 110 after acquisition sampled voltage signal IC, digit chip IC stablize Vout2 voltage by adjusting duty ratio and frequency, so that its fluctuation range is met LED light 400 and want It asks, realizes 400 constant pressure of LED light.
When the conducting of the down tube (i.e. the 2nd MOST pipe Q2) of resonance circuit 200, resonant capacitance Cri releases energy, and the two or two Pole pipe D2 conducting, Vout2 obtain energy, and LED light 400 obtains stable electric current, by after rectifying and wave-filtering first voltage signal and Tertiary voltage signal after rectifying and wave-filtering is transferred to digit chip IC by the second feedback unit 120, and digit chip IC passes through tune Duty ratio and frequency are saved to stablize Vout1 and Vout3 voltage, it is made to meet the voltage requirement of equipment machine core, realizes 300 He of mainboard 600 constant pressure of power amplifier.
The present invention also proposes that a kind of double feedback digital power supplys, double feedback digital power supplys include double feedbacks as described above The circuit structure of digital power circuit, double feedback digital power circuits of double feedback digital power supplys can refer to above-mentioned implementation Example, details are not described herein;It is understood that double feedback digital power supplys due to the present embodiment use above-mentioned double feedback digitals The technical solution of power circuit, therefore double feedback digital power supplys have above-mentioned all beneficial effects.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills Art field, is included within the scope of the present invention.

Claims (10)

1. a kind of double feedback digital power circuits, which is characterized in that including feed circuit, resonance circuit and digit chip;Wherein,
The feed circuit is separately connected with the resonance circuit, the digit chip, mainboard and LED light, described for obtaining The output voltage signal of resonance circuit, and the digit chip is outputed voltage signal to described in transmission;
The digit chip is connect with the resonance circuit, for receiving the output voltage signal, and according to the output electricity Press signal to the resonance circuit output drive signal;
The resonance circuit, connect with circuit of power factor correction, for receiving the driving signal and the power factor school The input signal that positive circuit is sent, and the electricity for being input to the LED light is controlled according to the driving signal and the input signal Press the voltage constant pressure of constant pressure and the mainboard.
2. double feedback digital power circuits as described in claim 1, which is characterized in that the resonance circuit includes harmonic conversion Unit, rectification filtering unit and sampling unit;Wherein,
The resonance conversion unit, with the circuit of power factor correction, the digit chip and the rectification filtering unit point It does not connect, for receiving the driving signal and the input signal, and according to the driving signal and the input signal point It Shu Chu not first voltage signal, second voltage signal, tertiary voltage signal to the rectification filtering unit;
The rectification filtering unit is distinguished with the sampling unit, the feed circuit, the mainboard, the LED light and power amplifier Connection, for the first voltage signal, the second voltage signal and the tertiary voltage signal to be carried out rectification filter respectively It is corresponding after wave to be sent to the mainboard and the feed circuit, the LED light and the sampling unit, the power amplifier and described anti- Current feed circuit;
The sampling unit is separately connected with the LED light and the feed circuit, for according to the second electricity after rectifying and wave-filtering Pressure signal samples the input voltage of the LED light, obtains and sends sampled voltage signal to the feed circuit.
3. double feedback digital power circuits as claimed in claim 2, which is characterized in that the resonance conversion unit includes first Metal-oxide-semiconductor, the second metal-oxide-semiconductor, inductance, transformer, electrolytic capacitor, parasitic capacitance and resonant capacitance;Wherein,
The first end of the electrolytic capacitor and the drain electrode of the circuit of power factor correction and first metal-oxide-semiconductor are separately connected, The second end of the electrolytic capacitor and the source electrode of the circuit of power factor correction and second metal-oxide-semiconductor are separately connected;
The grid of first metal-oxide-semiconductor is connect with the digit chip, the source electrode of first metal-oxide-semiconductor and second metal-oxide-semiconductor Drain electrode, the first end of the inductance, the first end of the parasitic capacitance be separately connected;
The drain electrode of second metal-oxide-semiconductor is separately connected with the first end of the inductance and the first end of the parasitic capacitance, described The grid of second metal-oxide-semiconductor is connect with the digit chip, the source electrode of second metal-oxide-semiconductor and the second end of the parasitic capacitance and The first end of the resonant capacitance is separately connected;
The second end of the inductance is connect with the first end of the primary coil of the transformer;
The second end of the resonant capacitance is connect with the second end of the primary coil of the transformer;
The first secondary coil, second subprime coil and the third secondary coil of the transformer connect with the rectification filtering unit It connects.
4. double feedback digital power circuits as claimed in claim 3, which is characterized in that the rectification filtering unit includes first Diode, the second diode, third diode, first capacitor, the second capacitor and third capacitor;Wherein,
The anode of the first diode is connect with the first end of first secondary coil, the cathode of the first diode with The first end of the first capacitor, the mainboard and the feed circuit are separately connected;
The second end of the first capacitor is separately connected with the second end of first secondary coil and the mainboard;
The anode of second diode is connect with the first end of the second subprime coil, the cathode of second diode with The first end and the LED light of second capacitor are separately connected;
The second end of second capacitor is separately connected with the second end of the second subprime coil and the sampling unit;
The anode of the third diode is connect with the first end of the third secondary coil, the cathode of the third diode with First end, the power amplifier and the feed circuit of the third capacitor are separately connected;
The second end of the third capacitor is separately connected with the second end of the third secondary coil and the power amplifier.
5. double feedback digital power circuits as claimed in claim 4, which is characterized in that the first end of the primary coil and institute State the first end of the first secondary coil, the second end of the second subprime coil, the first end of the third secondary coil each other Same Name of Ends.
6. double feedback digital power circuits as claimed in claim 5, which is characterized in that the sampling unit includes sampling electricity Resistance, the first end of the sampling resistor connect with the second end of the second subprime coil, the second end of the sampling resistor and The feed circuit and the LED light are separately connected.
7. double feedback digital power circuits as claimed in claim 6, which is characterized in that the feed circuit includes the first feedback Unit and the second feedback unit;Wherein,
The of the first end of the input terminal of first feedback unit and first secondary coil and the third secondary coil One end is separately connected, and the output end of first feedback unit is connect with the digit chip, and first feedback unit is used for The tertiary voltage signal after first voltage signal and rectifying and wave-filtering after receiving rectifying and wave-filtering, and by the after the rectifying and wave-filtering Tertiary voltage signal after one voltage signal and rectifying and wave-filtering is sent to the digit chip;
The input terminal of second feedback unit is connect with the second end of the sampling resistor, the output of second feedback unit End is connect with the digit chip, for receiving the sampled voltage signal, and described in the sampled voltage signal is sent to Digit chip.
8. double feedback digital power circuits as described in any one of claims 1 to 7, which is characterized in that further include rectified current Road and circuit of power factor correction;Wherein,
The rectification circuit is connect with the circuit of power factor correction and AC power source, stable for being converted to alternating current Direct current, and direct current signal is exported to the circuit of power factor correction;
The circuit of power factor correction is connect with the resonance circuit, for the direct current signal to be carried out power factor school Just, and input signal is sent to the resonance circuit.
9. double feedback digital power circuits as claimed in claim 8, which is characterized in that the rectification circuit includes filter unit And rectifier bridge;The filter unit is connect with the AC power source, the rectifier bridge and the filter unit and the power because Number correcting circuit is separately connected.
10. a kind of double feedback digital power supplys, which is characterized in that double anti-including as claim in any one of claims 1 to 9 Present digital power circuit.
CN201910724609.6A 2019-08-06 2019-08-06 Double feedback digital power circuits and power supply Pending CN110391751A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111315076A (en) * 2020-03-24 2020-06-19 深圳创维-Rgb电子有限公司 LED power supply system and device
WO2021036740A1 (en) * 2019-08-27 2021-03-04 深圳Tcl新技术有限公司 Llc power source control circuit and power source control device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107454712A (en) * 2017-07-27 2017-12-08 青岛海信电器股份有限公司 Display device, lighting device and can simultaneously constant current and constant pressure output power circuit
CN108123604A (en) * 2017-12-28 2018-06-05 深圳Tcl新技术有限公司 Resonant power and electronic equipment

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107454712A (en) * 2017-07-27 2017-12-08 青岛海信电器股份有限公司 Display device, lighting device and can simultaneously constant current and constant pressure output power circuit
CN108123604A (en) * 2017-12-28 2018-06-05 深圳Tcl新技术有限公司 Resonant power and electronic equipment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021036740A1 (en) * 2019-08-27 2021-03-04 深圳Tcl新技术有限公司 Llc power source control circuit and power source control device
CN111315076A (en) * 2020-03-24 2020-06-19 深圳创维-Rgb电子有限公司 LED power supply system and device

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Application publication date: 20191029