CN110572903A - LED power supply with constant current output - Google Patents
LED power supply with constant current output Download PDFInfo
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- CN110572903A CN110572903A CN201910803115.7A CN201910803115A CN110572903A CN 110572903 A CN110572903 A CN 110572903A CN 201910803115 A CN201910803115 A CN 201910803115A CN 110572903 A CN110572903 A CN 110572903A
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Abstract
The invention discloses an LED power supply with constant current output, which comprises a rectifying circuit, a voltage transformation circuit, a feedback circuit, a control circuit, a plurality of LED lighting circuits and a counting circuit, wherein the counting circuit is connected with the plurality of LED lighting circuits and counts according to the number of the lighted LEDs so as to adjust reference voltage input to the feedback circuit, the feedback circuit performs summation calculation according to the adjustment of the reference voltage and outputs the summation calculation to the control circuit, and the control circuit controls a control signal of the voltage transformation circuit according to the output of the summation circuit so as to keep the current output to the LEDs constant. The invention carries out voltage feedback through the number of the lighting LEDs and controls the current value output by the power supply to be constant.
Description
Technical Field
The invention relates to the technical field of LED lighting, in particular to an LED power supply with constant current output.
Background
The LED lamp is used as a novel energy-saving light source, and has been widely accepted and adopted by people due to its characteristics of environmental protection, energy saving, long service life, small size, etc. With the continuous improvement of the living standard of people, no matter higher requirements are put forward on the brightness and the energy consumption of the LED lamp at home or in a shop, namely people need to further improve the brightness of the LED lamp and simultaneously need the LED lamp to have lower energy consumption. And brightness control is carried out according to the lighting quantity of different LEDs so as to carry out maximum brightness control at the lowest loss or energy consumption, and the requirements of people on brightness, energy consumption and the like are met.
In the prior art, in order to reduce cost, a plurality of paths of constant currents are carried out in a passive mode, and more accurate current sharing among the paths of currents can be realized. In the prior art, a plurality of primary windings of a high-frequency transformer are connected in series, and a secondary winding obtains direct current by utilizing capacitance rectification, and multi-path load current is the same. The technology utilizes the principle that the current of the primary side and the secondary side of an ideal transformer depends on the turn ratio, and realizes the equal average current of the secondary side under the condition of ensuring the same turn ratio of a plurality of transformers. This technique, although simple, has some drawbacks that seriously affect its range of application. When the brightness of the lighted LEDs is controlled according to the number of the LEDs and the matching of different LED numbers cannot be met in time, the current output to the corresponding LED number is dynamically adjusted to be constant, so that the current output to the LEDs is matched with the brightness and the number of the LEDs.
Disclosure of Invention
The invention provides an LED power supply with constant current output, which comprises a rectifying circuit, a voltage transformation circuit, a feedback circuit, a control circuit, a plurality of LED lighting circuits and a counting circuit, wherein the counting circuit is connected with the plurality of LED lighting circuits and counts according to the number of the lighted LEDs so as to adjust reference voltage input to the feedback circuit, the feedback circuit performs summation calculation according to the adjustment of the reference voltage and outputs the summation calculation to the control circuit, and the control circuit controls a control signal of the voltage transformation circuit according to the output of the summation circuit so as to keep the current output to the LEDs constant.
The power supply comprises a rectifying circuit which comprises four controllable switches G1-G4, and the four controllable switches G1-G4 are combined to form a full-bridge rectifying circuit.
The output end of the rectifying circuit of the power supply is connected with a capacitor C1 in parallel, two ends of the capacitor C1 are connected with a voltage transformation circuit in parallel, and the voltage transformation circuit is connected with the LED through a voltage stabilizing circuit.
The voltage stabilizing circuit of the power supply comprises a diode D1, an inductor L1, a capacitor C2 and resistors R1-R2, wherein the anode of the diode D1 is connected with the voltage transformation circuit, the cathode of the diode D1 is connected with one end of the inductor L1 and one end of the capacitor C2, the other end of the capacitor C2 is grounded, the other end of the inductor L1 is connected with one end of the resistor R1 and the anode of the first LED respectively, the cathode of the first LED is connected with the anode of the second LED, the other end of the resistor R1 is connected with one end of the resistor R2, and the other end of the resistor R2 is grounded.
The other end of the resistor R1 is connected with the feedback circuit and the plurality of LED lighting circuits respectively, a first LED electric quantity circuit of the plurality of LED lighting circuits comprises a comparator U2, a battery B, a voltage stabilizing diode D2, a resistor R3, a variable resistor R4, a resistor R5, a capacitor C4, a switch tube G8 and a switch tube G7, the positive output end of the comparator U2 is connected with the other end of the resistor R1, the negative input end of the comparator U2 is connected with the positive electrode of the battery B, the negative electrode B of the battery is grounded, the anode of the voltage stabilizing diode D2 is grounded, and the cathode of the comparator U2 is connected with the output end of the voltage stabilizing diode D2; one end of a resistor R3 is connected with the anode of the first LED and one end of a resistor R5, the other end of the resistor R3 is connected with one end of a variable resistor R4, one end of a capacitor C4 and the control end of a switch tube G8, the other ends of the variable resistor R4 and the capacitor C4 are grounded, the other end of the resistor R5 is connected with a non-control end of the switch tube G8 and the control end of the switch tube G7, the other non-control end of the switch tube G8 is connected with the output end of a comparator U2, one non-control end of the switch tube G7 is connected with the cathode of the first LED, the other non-control end of the switch tube G7 is grounded, and the control end of the switch tube G7 is further connected.
the power supply source, the quantity of a plurality of LED lighting circuits and the quantity phase-match of LED, its connection structure all with first LED lighting structure the same, respectively parallel connection between LED's positive pole and negative pole, the control end that corresponds with switch tube G7 in its every LED electric quantity circuit all connects counting circuit, through counting circuit counts the LED quantity of lighting.
The power supply, feedback circuit include summation circuit, reference voltage circuit, the counting circuit is connected the reference voltage circuit, according to the counting result adjustment reference voltage's of counting circuit output value, the control circuit is connected to the output of summation circuit.
The power supply, the transformation circuit includes transformer T1, switch tube G5; the switching tube G5 is connected to the primary side of the transformer T1.
The control circuit of the power supply comprises a fuzzy PID controller, a triangular wave generator, a clock circuit, a comparator U1, an RS trigger, a switch tube G6, a diode D3 and a capacitor C3; the summing circuit is connected to a fuzzy PID controller, the fuzzy PID controller is connected to a triangular wave generator, the output end of the triangular wave generator is connected to the positive input end of a comparator U1, the negative input end of the comparator U1 is connected to one non-control end of a switch tube G6, the other non-control end of a switch tube G6 is connected to one end of a capacitor C3, the other end of the capacitor C3 is connected to the cathode of a diode D3, the anode of a diode D3 is connected to one non-control end of a switch tube G5, the other non-control end of the switch tube G5 is grounded, the output end of the comparator U1 is connected to the R end of an RS trigger, the output end of the clock circuit is respectively connected to the S ends of the triangular wave generator and the RS trigger, the Q output end of the RS trigger is connected to the control end of the switch tube G5, and the non-.
The counting circuit of the power supply is a pulse counting circuit, and specifically comprises an even counter and an odd counter, and the even counter and the odd counter respectively output different counting signals to the reference voltage circuit; the reference voltage circuit comprises a multiple unit, a base unit and a floating unit, wherein the multiple unit is used for counting a proper first multiple after receiving an output signal of an even number counter, calculating a voltage floating value through the floating unit, multiplying the multiple by the base unit, and summing the multiple and the voltage floating value to obtain a first reference voltage; the multiple unit is used for receiving the output signals of the odd number counter, counting a proper second multiple, calculating a voltage floating value through the floating unit, multiplying the second multiple by the base number unit, and summing the voltage floating value and the base number unit to obtain a second reference voltage.
The invention has the advantages that the lighting quantity of a plurality of LEDs connected in series is controlled, the feedback reference voltage is adjusted according to the lighting quantity, the fuzzy control is carried out according to the output voltage to determine the switch control signal for controlling the voltage transformation circuit, so as to carry out the voltage output by the voltage transformation circuit and adjust the current output to the LEDs to be constant; the invention can adjust the feedback reference voltage in real time according to the lighted LED, and perform different control of even number and odd number, thereby realizing different voltage and current control of different using quantities, and can realize floating voltage adjustment according to fuzzy control, so that the influence of the output voltage floating value, such as ripple waves, on the voltage control is smaller, and a more accurate control switch signal in the voltage transformation circuit is obtained through fuzzy control.
Drawings
The invention will be further understood from the following description in conjunction with the accompanying drawings. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the embodiments. In the drawings, like reference numerals designate corresponding parts throughout the different views.
Fig. 1 is a schematic diagram of a constant current output LED power supply according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to embodiments thereof; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Other systems, methods, and/or features of the present embodiments will become apparent to those skilled in the art upon review of the following detailed description. It is intended that all such additional systems, methods, features and advantages be included within this description, be within the scope of the invention, and be protected by the accompanying claims. Additional features of the disclosed embodiments are described in, and will be apparent from, the detailed description that follows.
As shown in fig. 1, the schematic diagram of an LED power supply with constant current output provided by the present invention includes a rectifying circuit, a transforming circuit, a feedback circuit, a control circuit, a plurality of LED lighting circuits, and a counting circuit, wherein the counting circuit is connected to the plurality of LED lighting circuits, counts according to the number of the lighted LEDs to adjust the reference voltage input to the feedback circuit, the feedback circuit performs summation calculation according to the adjustment of the reference voltage and outputs the summation calculation to the control circuit, and the control circuit controls the control signal of the transforming circuit according to the output of the summation circuit to keep the current output to the LEDs constant.
The power supply comprises a rectifying circuit which comprises four controllable switches G1-G4, and the four controllable switches G1-G4 are combined to form a full-bridge rectifying circuit.
The output end of the rectifying circuit of the power supply is connected with a capacitor C1 in parallel, two ends of the capacitor C1 are connected with a voltage transformation circuit in parallel, and the voltage transformation circuit is connected with the LED through a voltage stabilizing circuit.
The voltage stabilizing circuit of the power supply comprises a diode D1, an inductor L1, a capacitor C2 and resistors R1-R2, wherein the anode of the diode D1 is connected with the voltage transformation circuit, the cathode of the diode D1 is connected with one end of the inductor L1 and one end of the capacitor C2, the other end of the capacitor C2 is grounded, the other end of the inductor L1 is connected with one end of the resistor R1 and the anode of the first LED respectively, the cathode of the first LED is connected with the anode of the second LED, the other end of the resistor R1 is connected with one end of the resistor R2, and the other end of the resistor R2 is grounded.
The other end of the resistor R1 is connected with the feedback circuit and the plurality of LED lighting circuits respectively, a first LED electric quantity circuit of the plurality of LED lighting circuits comprises a comparator U2, a battery B, a voltage stabilizing diode D2, a resistor R3, a variable resistor R4, a resistor R5, a capacitor C4, a switch tube G8 and a switch tube G7, the positive output end of the comparator U2 is connected with the other end of the resistor R1, the negative input end of the comparator U2 is connected with the positive electrode of the battery B, the negative electrode B of the battery is grounded, the anode of the voltage stabilizing diode D2 is grounded, and the cathode of the comparator U2 is connected with the output end of the voltage stabilizing diode D2; one end of a resistor R3 is connected with the anode of the first LED and one end of a resistor R5, the other end of the resistor R3 is connected with one end of a variable resistor R4, one end of a capacitor C4 and the control end of a switch tube G8, the other ends of the variable resistor R4 and the capacitor C4 are grounded, the other end of the resistor R5 is connected with a non-control end of the switch tube G8 and the control end of the switch tube G7, the other non-control end of the switch tube G8 is connected with the output end of a comparator U2, one non-control end of the switch tube G7 is connected with the cathode of the first LED, the other non-control end of the switch tube G7 is grounded, and the control end of the switch tube G7 is further connected.
The power supply source, the quantity of a plurality of LED lighting circuits and the quantity phase-match of LED, its connection structure all with first LED lighting structure the same, respectively parallel connection between LED's positive pole and negative pole, the control end that corresponds with switch tube G7 in its every LED electric quantity circuit all connects counting circuit, through counting circuit counts the LED quantity of lighting.
Other identical configurations of the plurality of LED lighting circuits are not shown in fig. 1, but the number of LED lighting circuits is expanded according to the number of LEDs and connected in the circuit, and only the first LED lighting circuit is shown in fig. 1.
The power supply, feedback circuit include summation circuit, reference voltage circuit, the counting circuit is connected the reference voltage circuit, according to the counting result adjustment reference voltage's of counting circuit output value, the control circuit is connected to the output of summation circuit.
The power supply, the transformation circuit includes transformer T1, switch tube G5; the switching tube G5 is connected to the primary side of the transformer T1.
The control circuit of the power supply comprises a fuzzy PID controller, a triangular wave generator, a clock circuit, a comparator U1, an RS trigger, a switch tube G6, a diode D3 and a capacitor C3; the summing circuit is connected to a fuzzy PID controller, the fuzzy PID controller is connected to a triangular wave generator, the output end of the triangular wave generator is connected to the positive input end of a comparator U1, the negative input end of the comparator U1 is connected to one non-control end of a switch tube G6, the other non-control end of a switch tube G6 is connected to one end of a capacitor C3, the other end of the capacitor C3 is connected to the cathode of a diode D3, the anode of a diode D3 is connected to one non-control end of a switch tube G5, the other non-control end of the switch tube G5 is grounded, the output end of the comparator U1 is connected to the R end of an RS trigger, the output end of the clock circuit is respectively connected to the S ends of the triangular wave generator and the RS trigger, the Q output end of the RS trigger is connected to the control end of the switch tube G5, and the non-.
The counting circuit of the power supply is a pulse counting circuit, and specifically comprises an even counter and an odd counter, and the even counter and the odd counter respectively output different counting signals to the reference voltage circuit; the reference voltage circuit comprises a multiple unit, a base unit and a floating unit, wherein the multiple unit is used for counting a proper first multiple after receiving an output signal of an even number counter, calculating a voltage floating value through the floating unit, multiplying the multiple by the base unit, and summing the multiple and the voltage floating value to obtain a first reference voltage; the multiple unit is used for receiving the output signals of the odd number counter, counting a proper second multiple, calculating a voltage floating value through the floating unit, multiplying the second multiple by the base number unit, and summing the voltage floating value and the base number unit to obtain a second reference voltage.
The variable resistor R4 of the first LED lighting circuit dynamically adjusts specific values of the lighting LEDs according to different LED types, for example, for different LEDs, the value of the variable resistor R4 can be manually adjusted according to different nominal lighting voltages, and the optimal resistance value of the variable resistor R4 can be adjusted through the controller according to the fact that the power supply voltage detection and matching are automatically carried out by a system when the LEDs are assembled to a power supply.
The switching tube G8 is preferably a Darlington tube, the switching tubes G1-G7 are preferably MOS tubes, the battery B is preferably a lithium ion battery, and the transformer T1 is preferably an isolation transformer with an iron core.
Preferably, the control signal to control switch G5 is Vq,
Where Vm is a voltage change caused by control of a switching period Ts, Ts is a switching period, and ton is a switching on time.
Where Dmin is the minimum value of the high level ratio of the clock signal in a single period,Is a periodic constant, determined empirically or by control parameters of the system.
The invention has the advantages that the lighting quantity of a plurality of LEDs connected in series is controlled, the feedback reference voltage is adjusted according to the lighting quantity, the fuzzy control is carried out according to the output voltage to determine the switch control signal for controlling the voltage transformation circuit, so as to carry out the voltage output by the voltage transformation circuit and adjust the current output to the LEDs to be constant; the invention can adjust the feedback reference voltage in real time according to the lighted LED, and perform different control of even number and odd number, thereby realizing different voltage and current control of different using quantities, and can realize floating voltage adjustment according to fuzzy control, so that the influence of the output voltage floating value, such as ripple waves, on the voltage control is smaller, and a more accurate control switch signal in the voltage transformation circuit is obtained through fuzzy control.
The invention can adjust the lighting parameters of different types of LEDs, is convenient for the power supply to be connected with the different types of LEDs, and improves the application range of the power supply.
Although the invention has been described above with reference to various embodiments, it should be understood that many changes and modifications may be made without departing from the scope of the invention. It is therefore intended that the foregoing detailed description be regarded as illustrative rather than limiting, and that it be understood that it is the following claims, including all equivalents, that are intended to define the spirit and scope of this invention. The above examples are to be construed as merely illustrative and not limitative of the remainder of the disclosure. After reading the description of the invention, the skilled person can make various changes or modifications to the invention, and these equivalent changes and modifications also fall into the scope of the invention defined by the claims.
Claims (10)
1. The LED power supply with constant current output is characterized by comprising a rectifying circuit, a voltage transformation circuit, a feedback circuit, a control circuit, a plurality of LED lighting circuits and a counting circuit, wherein the counting circuit is connected with the plurality of LED lighting circuits and counts according to the number of the lighted LEDs so as to adjust reference voltage input to the feedback circuit, the feedback circuit performs summation calculation according to the adjustment of the reference voltage and outputs the summation calculation to the control circuit, and the control circuit controls a control signal of the voltage transformation circuit according to the output of the summation circuit so as to keep the current output to the LEDs constant.
2. The power supply of claim 1 wherein said rectifying circuit comprises four controllable switches G1-G4 combined in a full bridge rectifying circuit.
3. The power supply according to claim 1, wherein the output terminal of the rectifying circuit is connected in parallel with a capacitor C1, and two terminals of the capacitor C1 are connected in parallel with a transformer circuit, and the transformer circuit is connected with the LED through a voltage stabilizing circuit.
4. The power supply of claim 3, wherein the voltage regulator circuit comprises a diode D1, an inductor L1, a capacitor C2, and resistors R1-R2, the anode of the diode D1 is connected to the transformer circuit, the cathode of the diode D1 is connected to one ends of the inductor L1 and the capacitor C2, the other end of the capacitor C2 is grounded, the other end of the inductor L1 is connected to one end of the resistor R1 and the anode of the first LED, the cathode of the first LED is connected to the anode of the second LED, the other end of the resistor R1 is connected to one end of the resistor R2, and the other end of the resistor R2 is grounded.
5. The power supply according to claim 4, wherein the other end of the resistor R1 is connected to the feedback circuit and the plurality of LED lighting circuits, respectively, a first LED power circuit of the plurality of LED lighting circuits comprises a comparator U2, a battery B, a zener diode D2, a resistor R3, a variable resistor R4, a resistor R5, a capacitor C4, a switch tube G8 and a switch tube G7, a positive output end of the comparator U2 is connected to the other end of the resistor R1, a negative input end of the comparator U2 is connected to the positive pole of the battery B, a negative pole of the battery B is grounded, an anode of the zener diode D2 is grounded, and a cathode of the comparator U2; one end of a resistor R3 is connected with the anode of the first LED and one end of a resistor R5, the other end of the resistor R3 is connected with one end of a variable resistor R4, one end of a capacitor C4 and the control end of a switch tube G8, the other ends of the variable resistor R4 and the capacitor C4 are grounded, the other end of the resistor R5 is connected with a non-control end of the switch tube G8 and the control end of the switch tube G7, the other non-control end of the switch tube G8 is connected with the output end of a comparator U2, one non-control end of the switch tube G7 is connected with the cathode of the first LED, the other non-control end of the switch tube G7 is grounded, and the control end of the switch tube G7 is further connected.
6. The power supply according to claim 5, wherein the number of the plurality of LED lighting circuits matches the number of the LEDs, the connecting structures of the plurality of LED lighting circuits are the same as those of the first LED lighting structure and are respectively connected between the anode and the cathode of the LED in parallel, the control end of each LED electric quantity circuit corresponding to the switch tube G7 is connected with a counting circuit, and the number of the lighted LEDs is counted by the counting circuit.
7. The power supply of claim 3 wherein the feedback circuit comprises a summing circuit, a reference voltage circuit, the counting circuit is connected to the reference voltage circuit, the output of the reference voltage circuit is adjusted according to the counting result of the counting circuit, and the output of the summing circuit is connected to the control circuit.
8. The power supply of claim 3 wherein said transformer circuit comprises transformer T1, switch tube G5; the switching tube G5 is connected to the primary side of the transformer T1.
9. The power supply of claim 8 wherein the control circuit comprises a fuzzy PID controller, a triangle wave generator, a clock circuit, a comparator U1, an RS flip-flop, a switching tube G6, a diode D3, a capacitor C3; the summing circuit is connected to a fuzzy PID controller, the fuzzy PID controller is connected to a triangular wave generator, the output end of the triangular wave generator is connected to the positive input end of a comparator U1, the negative input end of the comparator U1 is connected to one non-control end of a switch tube G6, the other non-control end of a switch tube G6 is connected to one end of a capacitor C3, the other end of the capacitor C3 is connected to the cathode of a diode D3, the anode of a diode D3 is connected to one non-control end of a switch tube G5, the other non-control end of the switch tube G5 is grounded, the output end of the comparator U1 is connected to the R end of an RS trigger, the output end of the clock circuit is respectively connected to the S ends of the triangular wave generator and the RS trigger, the Q output end of the RS trigger is connected to the control end of the switch tube G5, and the non-.
10. The power supply according to claim 3, wherein the counting circuit is a pulse counting circuit, and specifically comprises an even counter and an odd counter, which respectively output different counting signals to the reference voltage circuit; the reference voltage circuit comprises a multiple unit, a base unit and a floating unit, wherein the multiple unit is used for counting a proper first multiple after receiving an output signal of an even number counter, calculating a voltage floating value through the floating unit, multiplying the multiple by the base unit, and summing the multiple and the voltage floating value to obtain a first reference voltage; the multiple unit is used for receiving the output signals of the odd number counter, counting a proper second multiple, calculating a voltage floating value through the floating unit, multiplying the second multiple by the base number unit, and summing the voltage floating value and the base number unit to obtain a second reference voltage.
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Cited By (1)
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| CN113436571A (en) * | 2020-03-18 | 2021-09-24 | 海信视像科技股份有限公司 | Display device and power supply circuit |
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| CN110572903B (en) | 2022-06-07 |
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