CN103220856B - Self-adapting light emitting diode (LED) driving power circuit - Google Patents
Self-adapting light emitting diode (LED) driving power circuit Download PDFInfo
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- CN103220856B CN103220856B CN201310123615.9A CN201310123615A CN103220856B CN 103220856 B CN103220856 B CN 103220856B CN 201310123615 A CN201310123615 A CN 201310123615A CN 103220856 B CN103220856 B CN 103220856B
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Abstract
The invention discloses a self-adapting light emitting diode (LED) driving power circuit. A constant-voltage mode or a constant-current mode is adopted by most LED power supplies at present, even though total power is the same, directional configuration is needed, cost is increased and using is not convenient. The self-adapting LED driving power circuit comprises a switch power circuit, an input power supply rectification and filtering circuit, a voltage feedback circuit, a current feedback circuit and an analog multiplier circuit, wherein an input end of the input power supply rectification and filtering circuit is connected with 220V voltage, an output end of the input power supply rectification and filtering circuit is connected with one input end of the switch power circuit, one output end of the switch power circuit is connected with an input end of the voltage feedback circuit, the other output end of the switch power circuit is connected with an input end of the current feedback circuit, an output end of the voltage feedback circuit is connected with one input end of the analog multiplier circuit, an output end of the current feedback circuit is connected with the other input end of the analog multiplier circuit, and an output end of the analog multiplier circuit is connected with the other input end of the switch power circuit. The self-adapting LED driving power circuit has the advantages that the power supply constant power of different LED loads connected in series or in parallel and under the condition of constant power is achieved.
Description
Technical field
The invention belongs to power technology and lighting field, be specifically related to a kind of adaptive LED driving power circuit.
Background technology
In today that energy-saving and emission-reduction cry is surging, the Developing mainstream progressively becoming lighting technology is become common recognition by LED illumination.The LED solid light source Application and Development being referred to as illumination revolution has again become one of target given priority to this century, and the LED industry of China also enters the stage of accelerated development.LED drive power is the guarantee of LED industry chain development, and the quality of LED power can affect and restrict the development of LED industry.The application of research LED drive power to LED industry is significant.For LED illumination application, its standard lamp has unified overall dimension and power, but the series-parallel system of inner LED has multiple change, and its driving voltage of similar light fixture causing different manufacturers to produce, electric current are different.Current LED drive power many employings constant voltage or current constant mode, although therefore light fixture gross power is identical, but driving power needs orientation arrangement and can not have good versatility just like that as conventional electronic ballast, this has not only raised the cost of LED illumination device, brings a lot of inconvenience also to actual application.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, provide a kind of adaptive LED driving power circuit.
The present invention includes switching power circuit, input power current rectifying and wave filtering circuit, voltage feedback circuit, current feedback circuit, analog multiplier circuit.The input termination 220V voltage of input power current rectifying and wave filtering circuit, output is connected with an input end signal of switching power circuit, an output of switching power circuit is connected with the input end signal of voltage feedback circuit, another output of switching power circuit is connected with the input end signal of current feedback circuit, the output of voltage feedback circuit is connected with analog multiplier circuit input end signal, the output of current feedback circuit is connected with another input end signal of analog multiplier circuit, the output of analog multiplier circuit is connected with another input end signal of switching power circuit.
Described input power current rectifying and wave filtering circuit comprises fuse F, rectifier bridge D, common mode inductance LA, the first inductance L 1, second inductance L 2, first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4; One end and 220V voltage input interface J1 of fuse F is connected, and the other end is connected with one end of the first inductance L 1, one end of the first electric capacity C1, and the other end of the first electric capacity C1 is connected with another input interface of 220V voltage J2 with one end of the second inductance L 2; The other end of the first inductance L 1 is connected with the 1st pin of common mode inductance L A, and the other end of the second inductance L 2 is connected with the 2nd pin of common mode inductance L A; Rectifier bridge D is made up of four diodes, the anode of the first diode D1 is connected with the negative electrode of the second diode D2 and is connected with the 3rd pin of common mode inductance L A, one end of the second electric capacity C2 afterwards, the anode of the 3rd diode D3 is connected with the negative electrode of the 4th diode D4 and is connected with the 4th pin of common mode inductance L A, one end of the 3rd electric capacity C3 afterwards, and the other end of the second electric capacity C2 is connected with the interface of the ground wire J3 of 220V voltage with the other end of the 3rd electric capacity C3; Ground connection after the anode of the second diode D2 is connected with the anode of the 4th diode D4, as the output of input power current rectifying and wave filtering circuit after the negative electrode of the first diode D1 is connected with the negative electrode of the 3rd diode D3.
Described switching power circuit comprises pulse width modulation device U1, MOSFET pipe VT, transformer T, first winding L a, second winding L b, tertiary winding Lc, first resistance R1, second resistance R2, 3rd resistance R3, 4th resistance R4, 5th resistance R5, 6th resistance R6, 7th resistance R7, 8th resistance R8, 9th resistance R9, tenth resistance R10, 11 resistance R11, 4th electric capacity C4, 5th electric capacity C5, 6th electric capacity C6, 7th electric capacity C7, 8th electric capacity C8, 9th electric capacity C9, tenth electric capacity C10, 11 electric capacity C11, 12 electric capacity C12, 13 electric capacity C13, 14 electric capacity C14, 15 electric capacity C15, 16 electric capacity C16, 17 electric capacity C17, 18 electric capacity C18, 19 electric capacity C19, 20 electric capacity C20, 5th diode D5, 6th diode D6, 7th diode D7, 8th diode D8, 9th diode D9, light-emitting diode D10, 3rd inductance L 3, 4th inductance L 4, the voltage error adjuster inverting input of pulse width modulation device U1 and one end of the 4th electric capacity C4, as a feedback input end V1 of switching power circuit after one end connection of the first resistance R1, voltage error adjuster normal phase input end is connected with one end of the second resistance R2, the other end of voltage error conditioner outlet end and the first resistance R1, one end of 3rd resistance R3, one end of 5th electric capacity C5 connects, and capacitor discharge control end is connected with one end of the 4th resistance R4, the other end of oscillating capacitance end and the 4th resistance R4, one end of 6th electric capacity C6 connects, and oscillation resistance end is connected with one end of the 5th resistance R5, and soft start end is connected with the positive pole of the 7th electric capacity C7, drive circuitry power end and input supply terminal, one end of 6th resistance R6, the positive pole of the 8th electric capacity C8, power supply VCC is met, the other end of reference voltage end and the second resistance R2 after one end connection of the 3rd inductance L 3, one end of 9th electric capacity C9 connects, and PWM output is connected with one end of the 7th resistance R7, and one end of input and the tenth electric capacity C10 is compared in pulse blocking, one end of 8th resistance R8 connects, one end of earth terminal and the 9th resistance R9, the other end of the tenth electric capacity C10, the negative pole of the 8th electric capacity C8, the other end of the 9th electric capacity C9, the negative pole of the 7th electric capacity C7, the other end of the 5th resistance R5, the other end of the 6th electric capacity C6, the other end of the 5th electric capacity C5, one end of 11 electric capacity C11 connects rear ground connection, and other pins are all built on stilts, the other end of the 3rd inductance L 3 is connected with the negative electrode of the 5th diode D5, one end of the 12 electric capacity C12, transformer is made up of three windings, one end of the first winding La and the anode of the 6th diode D6, one end of tenth resistance R10, one end of 13 electric capacity C13, the other end of the 6th resistance R6, be connected with the output of input power current rectifying and wave filtering circuit after the other end connection of the 11 electric capacity C11, the other end of the first winding La and the anode of the 7th diode D7, the drain electrode of MOSFET pipe VT connects, and one end of the second winding Lb is connected with the anode of the 8th diode D8, the other end of the second winding Lb and the negative pole of the 14 electric capacity C14, one end of 15 electric capacity C15, the negative pole of the 16 electric capacity C16, the negative pole of the 17 electric capacity C17, one end of 18 electric capacity C18, as an output interface J4 of switching power circuit after one end connection of the 19 electric capacity C19, one end of the 3rd winding Lc is connected with the anode of the 9th diode D9, the other end of the 3rd winding Lc and the negative pole of the 20 electric capacity C20, the other end of the 12 electric capacity C12, the other end of the 19 electric capacity C19, the negative electrode of light-emitting diode D10 connects rear ground connection, the grid of MOSFET pipe VT is connected with the other end of the 7th resistance R7, as an output V2 of switching power circuit after source electrode is connected with the other end of the 8th resistance R8, the other end of the 9th resistance R9, the negative electrode of the 8th diode D8 is connected with the positive pole of the 14 electric capacity C14, one end of the 15 electric capacity C15, the positive pole of the 16 electric capacity C16, one end of the 4th inductance L 4, as another output interface J5 of switching power circuit after the other end of the 4th inductance L 4 is connected with the positive pole of the 17 electric capacity C17, the other end of the 18 electric capacity C18, as another output V3 of switching power circuit after the negative electrode of the 9th diode D9 is connected with the positive pole of the 20 electric capacity C20, the anode of the 5th diode D5, one end of the 11 resistance R11, the other end of the 11 resistance R11 is connected with the anode of light-emitting diode D10.
Described pulse width modulation device U1 is the novel analog numerical value hybrid integrated chip of the feedback regulation that can realize current sampling signal, and this chip adopts and recommends output, can only connect driven MOS pipe, have the functions such as under-voltage locking, overvoltage protection and soft start.
Described voltage feedback circuit comprises the 12 resistance R12, the 13 resistance R13, slip variable resistance Rx; One end of 12 resistance R12 is connected with one end of slip variable resistance Rx, other end ground connection, the other end of slip variable resistance Rx is connected with one end of the 13 resistance R13, sliding end as the output of voltage feedback circuit, the other end of the 13 resistance R13 is connected with another output V3 of switching power circuit.
Described current feedback circuit comprises amplifier U2, the 14 resistance R14, the 15 resistance R15, the 16 resistance R16, the 17 resistance R17, the 18 resistance R18, the 19 resistance R19, the 20 resistance R20, the 21 electric capacity C21, the 22 electric capacity C22, the 23 electric capacity C23, the 5th inductance L 5, 1st pin of amplifier U2 and one end of the 14 resistance R14, one end of 15 resistance R15, one end of 21 electric capacity C21 connects, 3rd pin is connected with one end of the 16 resistance R16, the other end of the 2nd pin and the 15 resistance R15, the other end of the 21 electric capacity C21, one end of 17 resistance R17 connects, 4th pin ground connection, 5th pin is connected with the other end of the 14 resistance R14, one end of 6th pin and the 18 resistance R18, one end of 19 resistance R19, one end of 22 electric capacity C22 connects, the other end of the 7th pin and the 18 resistance R18, as the output of current feedback circuit after the other end connection of the 22 electric capacity C22, 8th pin is connected with power supply VCC, the other end of the 16 resistance R16 is connected with one end of the 20 resistance R20, one end of the 23 electric capacity C23, one end of the 5th inductance L 5, the other end of the 20 resistance R20 is connected rear ground connection with the other end of the 23 electric capacity C23, the other end of the 19 resistance R19, the equal ground connection of the other end of the 17 resistance R17, the other end of the 5th inductance L 5 is connected with an output V2 of switching power circuit.
Described analog multiplier circuit comprises analog multiplier U3, the 21 resistance R21, the 22 resistance R22, the 23 resistance R23; 1st pin of analog multiplier U3 is connected with the output of current feedback circuit, ground connection after 2nd pin is connected with one end of the 4th pin, the 5th pin, the 21 resistance R21,3rd pin is connected with the output of voltage feedback circuit, the other end of the 6th pin and the 21 resistance R21, one end of the 22 resistance R22, one end of the 23 resistance R23 are connected, 7th pin is connected with the other end of the 23 resistance R23, and the 8th pin is connected with power supply VCC; The other end of the 22 resistance R22 is connected with a feedback input end V1 of switching power circuit.
The voltage signal that described switching power circuit exports and current signal are sampled respectively by voltage feedback circuit and current feedback circuit, and power feedback signal is obtained after analog multiplier circuit, control pulse width modulator adjusting pulsewidth, thus realize output constant power at two output interfaces J4, J5 of switching power circuit.
Beneficial effect of the present invention is: the power supply that can be realized the LED load group of the different connection of connection in series-parallel in invariable power situation by the present invention can both invariable power.The present invention changes under traditional different connected modes, and the limitation that power supply can not be general is conducive to the unified standard configuration of LED load group, simplifies the outfit of LED load group power supply, effectively promotes the extensive use of LED load group.
Accompanying drawing explanation
Fig. 1 is System's composition schematic diagram of the present invention;
Fig. 2 is the circuit diagram of input power current rectifying and wave filtering circuit;
Fig. 3 is the circuit diagram of Switching Power Supply;
The circuit diagram of Fig. 4 voltage feedback circuit;
Fig. 5 is the circuit diagram of current feedback circuit;
Fig. 6 is the circuit diagram of analog multiplier circuit.
Embodiment
For further analysis to the present invention below in conjunction with accompanying drawing.
As shown in Figure 1, the present invention includes input power current rectifying and wave filtering circuit 1, switching power circuit 2, voltage feedback circuit 3, current feedback circuit 4, analog multiplier circuit 5.Input termination 220V voltage, the output of input power current rectifying and wave filtering circuit 1 are connected with an input end signal of switching power circuit 2, an output of switching power circuit 2 is connected with the input end signal of voltage feedback circuit 3, and another output of switching power circuit 2 is connected with the input end signal of current feedback circuit 4; The output of voltage feedback circuit 3 is connected with an input end signal of analog multiplier circuit 5, the output of current feedback circuit 4 is connected with another input end signal of analog multiplier circuit 5, and the output of analog multiplier circuit 5 is connected with another input end signal of switching power circuit 2.
As shown in Figure 2, input power current rectifying and wave filtering circuit 1 comprises fuse F, rectifier bridge D, common mode inductance LA, the first inductance L 1, second inductance L 2, first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3; One end and 220V voltage input interface J1 of fuse F is connected, and the other end is connected with one end of the first inductance L 1, one end of the first electric capacity C1, and the other end of the first electric capacity C1 is connected with another input interface of 220V voltage J2 with one end of the second inductance L 2; The other end of the first inductance L 1 is connected with the 1st pin of common mode inductance L A, and the other end of the second inductance L 2 is connected with the 2nd pin of common mode inductance L A; Rectifier bridge D is made up of four diodes, the anode of the first diode D1 is connected with the negative electrode of the second diode D2 and is connected with the 3rd pin of common mode inductance L A, one end of the second electric capacity C2 afterwards, the anode of the 3rd diode D3 is connected with the negative electrode of the 4th diode D4 and is connected with the 4th pin of common mode inductance L A, one end of the 3rd electric capacity C3 afterwards, and the other end of the second electric capacity C2 is connected with the interface of the ground wire J3 of 220V voltage with the other end of the 3rd electric capacity C3; Ground connection after the anode of the second diode D2 is connected with the anode of the 4th diode D4, as the output of input power current rectifying and wave filtering circuit 1 after the negative electrode of the first diode D1 is connected with the negative electrode of the 3rd diode D3.
As shown in Figure 3, switching power circuit 2 comprises pulse width modulation device U1, MOSFET pipe VT, transformer T, first winding L a, second winding L b, tertiary winding Lc, first resistance R1, second resistance R2, 3rd resistance R3, 4th resistance R4, 5th resistance R5, 6th resistance R6, 7th resistance R7, 8th resistance R8, 9th resistance R9, tenth resistance R10, 11 resistance R11, 4th electric capacity C4, 5th electric capacity C5, 6th electric capacity C6, 7th electric capacity C7, 8th electric capacity C8, 9th electric capacity C9, tenth electric capacity C10, 11 electric capacity C11, 12 electric capacity C12, 13 electric capacity C13, 14 electric capacity C14, 15 electric capacity C15, 16 electric capacity C16, 17 electric capacity C17, 18 electric capacity C18, 19 electric capacity C19, 20 electric capacity C20, 5th diode D5, 6th diode D6, 7th diode D7, 8th diode D8, 9th diode D9, light-emitting diode D10, 3rd inductance L 3, 4th inductance L 4, 1st pin of pulse width modulation device U1 and one end of the 4th electric capacity C4, as a feedback input end V1 of switching power circuit 2 after one end connection of the first resistance R1, the 2nd pin is connected with one end of the second resistance R2, the other end of the 9th pin and the first resistance R1, one end of 3rd resistance R3, one end of 5th electric capacity C5 connects, and the 7th pin is connected with one end of the 4th resistance R4, the other end of the 5th pin and the 4th resistance R4, one end of 6th electric capacity C6 connects, and the 6th pin is connected with one end of the 5th resistance R5, and the 8th pin is connected with the positive pole of the 7th electric capacity C7, the 13rd pin and the 15th pin, one end of 6th resistance R6, the positive pole of the 8th electric capacity C8, power supply VCC is met, the other end of the 16th pin and the second resistance R2 after one end connection of the 3rd inductance L 3, one end of 9th electric capacity C9 connects, and the 11st pin is connected with one end of the 7th resistance R7, one end of the 10th pin and the tenth electric capacity C10, one end of 8th resistance R8 connects, one end of the 12nd pin and the 9th resistance R9, the other end of the tenth electric capacity C10, the negative pole of the 8th electric capacity C8, the other end of the 9th electric capacity C9, the negative pole of the 7th electric capacity C7, the other end of the 5th resistance R5, the other end of the 6th electric capacity C6, the other end of the 5th electric capacity C5, one end of 11 electric capacity C11 connects rear ground connection, and other pins are all built on stilts, the other end of the 3rd inductance L 3 is connected with the negative electrode of the 5th diode D5, one end of the 12 electric capacity C12, transformer is made up of three windings, one end of the first winding La and the anode of the 6th diode D6, one end of tenth resistance R10, one end of 13 electric capacity C13, the other end of the 6th resistance R6, be connected with the output of input power current rectifying and wave filtering circuit 1 after the other end connection of the 11 electric capacity C11, the other end of the first winding La and the anode of the 7th diode D7, the drain electrode of MOSFET pipe VT connects, and one end of the second winding Lb is connected with the anode of the 8th diode D8, the other end of the second winding Lb and the negative pole of the 14 electric capacity C14, one end of 15 electric capacity C15, the negative pole of the 16 electric capacity C16, the negative pole of the 17 electric capacity C17, one end of 18 electric capacity C18, an output interface J4 as switching power circuit 2 after one end connection of the 19 electric capacity C19 connects, and one end of the 3rd winding Lc is connected with the anode of the 9th diode D9, the other end of the 3rd winding Lc and the negative pole of the 20 electric capacity C20, the other end of the 12 electric capacity C12, the other end of the 19 electric capacity C19, the negative electrode of light-emitting diode D10 connects rear ground connection, the grid of MOSFET pipe VT is connected with the other end of the 7th resistance R7, as an output V2 of switching power circuit 2 after source electrode is connected with the other end of the 8th resistance R8, the other end of the 9th resistance R9, the negative electrode of the 8th diode D8 is connected with the positive pole of the 14 electric capacity C14, one end of the 15 electric capacity C15, the positive pole of the 16 electric capacity C16, one end of the 4th inductance L 4, an output interface J5 as switching power circuit 2 after the other end of the 4th inductance L 4 is connected with the positive pole of the 17 electric capacity C17, the other end of the 18 electric capacity C18 connects, as another output V3 of switching power circuit 2 after the negative electrode of the 9th diode D9 is connected with the positive pole of the 20 electric capacity C20, the anode of the 5th diode D5, one end of the 11 resistance R11, the other end of the 11 resistance R11 is connected with the anode of light-emitting diode D10.The model of described pulse width modulation device U1 is SG3525A.
Two output interface J4 with J5 of switching power circuit 2 are connected with the input interface of LED load.Described LED load is existing LED light device.
As shown in Figure 4, voltage feedback circuit 3 comprises the 12 resistance R12, the 13 resistance R13, slip variable resistance Rx; One end of 12 resistance R12 is connected with one end of slip variable resistance Rx, other end ground connection, the other end of slip variable resistance Rx is connected with one end of the 13 resistance R13, sliding end as the output of voltage feedback circuit 3, the other end of the 13 resistance R13 is connected with another output V3 of switching power circuit 2.
As shown in Figure 5, current feedback circuit 4 comprises amplifier U2, the 14 resistance R14, the 15 resistance R15, the 16 resistance R16, the 17 resistance R17, the 18 resistance R18, the 19 resistance R19, the 20 resistance R20, the 21 electric capacity C21, the 22 electric capacity C22, the 23 electric capacity C23, the 5th inductance L 5, 1st pin of amplifier U2 and one end of the 14 resistance R14, one end of 15 resistance R15, one end of 21 electric capacity C21 connects, 3rd pin is connected with one end of the 16 resistance R16, the other end of the 2nd pin and the 15 resistance R15, the other end of the 21 electric capacity C21, one end of 17 resistance R17 connects, 4th pin ground connection, 5th pin is connected with the other end of the 14 resistance R14, one end of 6th pin and the 18 resistance R18, one end of 19 resistance R19, one end of 22 electric capacity C22 connects, the other end of the 7th pin and the 18 resistance R18, as the output of current feedback circuit 4 after the other end connection of the 22 electric capacity C22, 8th pin is connected with power supply VCC, the other end of the 16 resistance R16 is connected with one end of the 20 resistance R20, one end of the 23 electric capacity C23, one end of the 5th inductance L 5, the other end of the 20 resistance R20 is connected rear ground connection with the other end of the 23 electric capacity C23, the other end of the 19 resistance R19, the equal ground connection of the other end of the 17 resistance R17, the other end of the 5th inductance L 5 is connected with an output V2 of switching power circuit 2.The model of described amplifier U2 is LM358.
As shown in Figure 6, analog multiplier circuit 5 comprises analog multiplier U3, the 21 resistance R21, the 22 resistance R22, the 23 resistance R23; 1st pin of analog multiplier U3 is connected with the output of current feedback circuit 4, ground connection after 2nd pin is connected with one end of the 4th pin, the 5th pin, the 21 resistance R21,3rd pin is connected with the output of voltage feedback circuit 3, the other end of the 6th pin and the 21 resistance R21, one end of the 22 resistance R22, one end of the 23 resistance R23 are connected, 7th pin is connected with the other end of the 23 resistance R23, and the 8th pin is connected with power supply VCC; The other end of the 22 resistance R22 is connected with a feedback input end V1 of switching power circuit 2.
The model of described analog multiplier U3 is AD633.
The course of work:
In input power current rectifying and wave filtering circuit 1,220V input power after filtering, rectification provides power supply to switching power circuit 2.What switching power circuit 2 adopted is the form of inverse-excitation type, and the DC power supply of stable output is powered to LED load.The principle of switching power circuit 2 constant power output voltage is: utilize feedback principle, the voltage signal that transformer T exports and current signal are sampled respectively by voltage feedback circuit 3 and current feedback circuit 4, and the power of feedback is obtained through analog multiplier U3, the error amplifier of the pulse width modulation device U1 in switching power circuit 2 regulates according to the power signal of feedback again, thus the power supply of output constant power is powered to LED load.
Above-described embodiment is not that the present invention is not limited only to above-described embodiment for restriction of the present invention, as long as meet application claims, all belongs to protection scope of the present invention.
Claims (3)
1. an adaptive LED driving power circuit, is characterized in that comprising switching power circuit, input power current rectifying and wave filtering circuit, voltage feedback circuit, current feedback circuit, analog multiplier circuit, the input termination 220V voltage of input power current rectifying and wave filtering circuit, output is connected with an input end signal of switching power circuit, an output of switching power circuit is connected with the input end signal of voltage feedback circuit, another output of switching power circuit is connected with the input end signal of current feedback circuit, the output of voltage feedback circuit is connected with analog multiplier circuit input end signal, the output of current feedback circuit is connected with another input end signal of analog multiplier circuit, the output of analog multiplier circuit is connected with another input end signal of switching power circuit,
Described input power current rectifying and wave filtering circuit comprises fuse F, rectifier bridge D, common mode inductance LA, the first inductance L 1, second inductance L 2, first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4; One end and 220V voltage input interface J1 of fuse F is connected, and the other end is connected with one end of the first inductance L 1, one end of the first electric capacity C1, and the other end of the first electric capacity C1 is connected with another input interface of 220V voltage J2 with one end of the second inductance L 2; The other end of the first inductance L 1 is connected with the 1st pin of common mode inductance L A, and the other end of the second inductance L 2 is connected with the 2nd pin of common mode inductance L A; Rectifier bridge D is made up of four diodes, the anode of the first diode D1 is connected with the negative electrode of the second diode D2 and is connected with the 3rd pin of common mode inductance L A, one end of the second electric capacity C2 afterwards, the anode of the 3rd diode D3 is connected with the negative electrode of the 4th diode D4 and is connected with the 4th pin of common mode inductance L A, one end of the 3rd electric capacity C3 afterwards, and the other end of the second electric capacity C2 is connected with the interface of the ground wire J3 of 220V voltage with the other end of the 3rd electric capacity C3; Ground connection after the anode of the second diode D2 is connected with the anode of the 4th diode D4, as the output of input power current rectifying and wave filtering circuit after the negative electrode of the first diode D1 is connected with the negative electrode of the 3rd diode D3;
Described switching power circuit comprises pulse width modulation device U1, MOSFET pipe VT, transformer T, first resistance R1, second resistance R2, 3rd resistance R3, 4th resistance R4, 5th resistance R5, 6th resistance R6, 7th resistance R7, 8th resistance R8, 9th resistance R9, tenth resistance R10, 11 resistance R11, 4th electric capacity C4, 5th electric capacity C5, 6th electric capacity C6, 7th electric capacity C7, 8th electric capacity C8, 9th electric capacity C9, tenth electric capacity C10, 11 electric capacity C11, 12 electric capacity C12, 13 electric capacity C13, 14 electric capacity C14, 15 electric capacity C15, 16 electric capacity C16, 17 electric capacity C17, 18 electric capacity C18, 19 electric capacity C19, 20 electric capacity C20, 5th diode D5, 6th diode D6, 7th diode D7, 8th diode D8, 9th diode D9, light-emitting diode D10, 3rd inductance L 3, 4th inductance L 4, the voltage error adjuster inverting input of pulse width modulation device U1 and one end of the 4th electric capacity C4, as a feedback input end V1 of switching power circuit after one end connection of the first resistance R1, voltage error adjuster normal phase input end is connected with one end of the second resistance R2, the other end of voltage error conditioner outlet end and the first resistance R1, one end of 3rd resistance R3, one end of 5th electric capacity C5 connects, and capacitor discharge control end is connected with one end of the 4th resistance R4, the other end of oscillating capacitance end and the 4th resistance R4, one end of 6th electric capacity C6 connects, and oscillation resistance end is connected with one end of the 5th resistance R5, and soft start end is connected with the positive pole of the 7th electric capacity C7, drive circuitry power end and input supply terminal, one end of 6th resistance R6, the positive pole of the 8th electric capacity C8, power supply VCC is met, the other end of reference voltage end and the second resistance R2 after one end connection of the 3rd inductance L 3, one end of 9th electric capacity C9 connects, and PWM output is connected with one end of the 7th resistance R7, and one end of input and the tenth electric capacity C10 is compared in pulse blocking, one end of 8th resistance R8 connects, one end of earth terminal and the 9th resistance R9, the other end of the tenth electric capacity C10, the negative pole of the 8th electric capacity C8, the other end of the 9th electric capacity C9, the negative pole of the 7th electric capacity C7, the other end of the 5th resistance R5, the other end of the 6th electric capacity C6, the other end of the 5th electric capacity C5, one end of 11 electric capacity C11 connects rear ground connection, and other ends are all built on stilts, the other end of the 3rd inductance L 3 is connected with the negative electrode of the 5th diode D5, one end of the 12 electric capacity C12, transformer is by the first winding La, second winding Lb, 3rd winding Lc is formed, one end of the first winding La and the anode of the 6th diode D6, one end of tenth resistance R10, one end of 13 electric capacity C13, the other end of the 6th resistance R6, be connected with the output of input power current rectifying and wave filtering circuit after the other end connection of the 11 electric capacity C11, the other end of the first winding La and the anode of the 7th diode D7, the drain electrode of MOSFET pipe VT connects, and one end of the second winding Lb is connected with the anode of the 8th diode D8, the other end of the second winding Lb and the negative pole of the 14 electric capacity C14, one end of 15 electric capacity C15, the negative pole of the 16 electric capacity C16, the negative pole of the 17 electric capacity C17, one end of 18 electric capacity C18, as an output interface J4 of switching power circuit after one end connection of the 19 electric capacity C19, one end of the 3rd winding Lc is connected with the anode of the 9th diode D9, the other end of the 3rd winding Lc and the negative pole of the 20 electric capacity C20, the other end of the 12 electric capacity C12, the other end of the 19 electric capacity C19, the negative electrode of light-emitting diode D10 connects rear ground connection, the grid of MOSFET pipe VT is connected with the other end of the 7th resistance R7, as an output V2 of switching power circuit after source electrode is connected with the other end of the 8th resistance R8, the other end of the 9th resistance R9, the negative electrode of the 8th diode D8 is connected with the positive pole of the 14 electric capacity C14, one end of the 15 electric capacity C15, the positive pole of the 16 electric capacity C16, one end of the 4th inductance L 4, as another output interface J5 of switching power circuit after the other end of the 4th inductance L 4 is connected with the positive pole of the 17 electric capacity C17, the other end of the 18 electric capacity C18, as another output V3 of switching power circuit after the negative electrode of the 9th diode D9 is connected with the positive pole of the 20 electric capacity C20, the anode of the 5th diode D5, one end of the 11 resistance R11, the other end of the 11 resistance R11 is connected with the anode of light-emitting diode D10,
Described voltage feedback circuit comprises the 12 resistance R12, the 13 resistance R13, slip variable resistance Rx; One end of 12 resistance R12 is connected with one end of slip variable resistance Rx, other end ground connection, the other end of slip variable resistance Rx is connected with one end of the 13 resistance R13, sliding end as the output of voltage feedback circuit, the other end of the 13 resistance R13 is connected with another output V3 of switching power circuit;
Described current feedback circuit comprises amplifier U2, the 14 resistance R14, the 15 resistance R15, the 16 resistance R16, the 17 resistance R17, the 18 resistance R18, the 19 resistance R19, the 20 resistance R20, the 21 electric capacity C21, the 22 electric capacity C22, the 23 electric capacity C23, the 5th inductance L 5, 1st pin of amplifier U2 and one end of the 14 resistance R14, one end of 15 resistance R15, one end of 21 electric capacity C21 connects, 3rd pin is connected with one end of the 16 resistance R16, the other end of the 2nd pin and the 15 resistance R15, the other end of the 21 electric capacity C21, one end of 17 resistance R17 connects, 4th pin ground connection, 5th pin is connected with the other end of the 14 resistance R14, one end of 6th pin and the 18 resistance R18, one end of 19 resistance R19, one end of 22 electric capacity C22 connects, the other end of the 7th pin and the 18 resistance R18, as the output of current feedback circuit after the other end connection of the 22 electric capacity C22, 8th pin is connected with power supply VCC, the other end of the 16 resistance R16 is connected with one end of the 20 resistance R20, one end of the 23 electric capacity C23, one end of the 5th inductance L 5, the other end of the 20 resistance R20 is connected rear ground connection with the other end of the 23 electric capacity C23, the other end of the 19 resistance R19, the equal ground connection of the other end of the 17 resistance R17, the other end of the 5th inductance L 5 is connected with an output V2 of switching power circuit, the model of described amplifier U2 is LM358,
Described analog multiplier circuit comprises analog multiplier U3, the 21 resistance R21, the 22 resistance R22, the 23 resistance R23; 1st pin of analog multiplier U3 is connected with the output of current feedback circuit, ground connection after 2nd pin is connected with one end of the 4th pin, the 5th pin, the 21 resistance R21,3rd pin is connected with the output of voltage feedback circuit, the other end of the 6th pin and the 21 resistance R21, one end of the 22 resistance R22, one end of the 23 resistance R23 are connected, 7th pin is connected with the other end of the 23 resistance R23, and the 8th pin is connected with power supply VCC; The other end of the 22 resistance R22 is connected with a feedback input end V1 of switching power circuit; The model of described analog multiplier U3 is AD633.
2. a kind of adaptive LED driving power circuit as claimed in claim 1; it is characterized in that described pulse width modulation device U1 is the novel analog numerical value hybrid integrated chip of the feedback regulation that can realize current sampling signal; this chip adopts and recommends output; can only connect driven MOS pipe, there is under-voltage locking, overvoltage protection and soft start function.
3. a kind of adaptive LED driving power circuit as claimed in claim 1, it is characterized in that the voltage signal that switching power circuit exports and current signal are sampled respectively by voltage feedback circuit and current feedback circuit, and power feedback signal is obtained after analog multiplier circuit, control pulse width modulator adjusting pulsewidth, thus realize output constant power at two output interfaces J4, J5 of switching power circuit.
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| CN103796395B (en) * | 2014-02-19 | 2016-04-06 | 中达电通股份有限公司 | A kind of self-adaption constant Power LED lamps and control method thereof |
| CN104039039B (en) * | 2014-05-23 | 2017-01-04 | 中国科学院广州能源研究所 | A kind of constant current LED drive circuit exporting two-way |
| CN107871428B (en) * | 2017-10-31 | 2023-06-30 | 浙大城市学院 | Inverter power supply circuit |
| CN109600881B (en) * | 2018-12-25 | 2024-03-05 | 中山市卓越制品有限公司 | LED lamp tube device |
| CN111725781B (en) * | 2020-06-19 | 2022-09-13 | 浙江普莱得电器股份有限公司 | Protection circuit and method based on hot air gun |
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