CN104470160A - Self-adaption efficient LED driving power supply - Google Patents
Self-adaption efficient LED driving power supply Download PDFInfo
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Abstract
The invention discloses a self-adaption efficient LED driving power supply. An independent circulating control unit is arranged so that voltage precision can be controlled within an ultra-small range, and voltage distortion can be effectively suppressed; due to the arrangement of a current stabilizing control unit, current can be maintained to be linearly continuous; the anti-interference capacity of a whole circuit is high, output is stable, and the electric energy utilization rate is high.
Description
Technical Field
The invention relates to the field of LED driving, in particular to a self-adaptive high-efficiency LED driving power supply.
Background
With the development of human civilization, lighting devices have already entered the daily life of people, and the traditional lighting sources mainly include incandescent lamps, fluorescent lamps, energy-saving lamps and the like, and the technology of the lighting sources is relatively mature, however, the lighting sources have short service life, high energy consumption, low luminous efficiency and even some of the lighting sources can bring pollution, and it is a future trend to develop novel lighting sources.
As a new light source, LEDs have the following main advantages over conventional light sources: the LED lighting lamp has the advantages of small volume, low power consumption, low heat generation, long service life, high response speed, safety, environmental friendliness, capability of meeting the requirements of special occasions due to the fact that the LED is successfully applied to lighting of certain general occasions at present, high luminous intensity, long service life and environmental friendliness, and the LED lighting lamp is bound to replace the traditional lighting to become a mainstream lighting source along with the increasing exhaustion of resources.
At present, alternating current is mainly adopted for supplying power to an LED, and constant voltage and current are obtained through a converter to supply power to the LED, however, the mode has low power factor and can not effectively inhibit distortion brought by an input end; the dimming is mainly realized by changing the current flowing through the LED, and under the condition of different currents, the luminous wavelength is different, so that the luminous efficiency is influenced, and therefore, the circuits have the defects of weak anti-interference capability, poor output stability, low output precision, low power factor and the like.
Disclosure of Invention
The purpose of the invention is realized by the following technical scheme.
According to an embodiment of the present invention, an adaptive high-efficiency LED driving power supply is provided, including: the device comprises an EMI filtering unit, a direct current conversion unit, a switch conversion unit, a driving switch power supply unit, an independent circulation control unit, an analog photoelectric isolation unit, a current stabilization power supply output unit, a current stabilization control unit and a pulse width modulation light adjusting unit; wherein,
the EMI filtering unit, the direct current conversion unit and the switch conversion unit are sequentially connected and are connected to the stabilized current power supply output unit, the output end of the switch conversion unit is connected with the driving switch power supply unit, the output end of the driving switch power supply unit is respectively connected with the independent circulation control unit, the analog photoelectric isolation unit, the stabilized current control unit and the pulse width modulation light adjusting unit, the output end of the analog photoelectric isolation unit is connected with the switch conversion unit through the independent circulation control unit, and the pulse width modulation light adjusting unit is connected to the stabilized current power supply output unit through the stabilized current control unit; the alternating current exports the switch converting unit behind EMI filter unit and direct current transform unit, and the output voltage that simulation optoelectronic isolation unit will detect is imported independent circulation control unit through simulation optoelectronic isolation, and drive switch power supply unit gives independent circulation control unit, simulation optoelectronic isolation unit, stationary flow control unit, the power supply of PWM light regulating unit respectively, and independent circulation control unit control switch converting unit exports the expectation voltage, and stationary flow control unit control stationary flow power output unit exports the expectation current, and PWM light regulating unit is right through the stationary flow control unit LED carries out the operation of adjusting luminance.
According to the embodiment of the invention, an input alternating current 220V voltage is connected into the direct current conversion unit after being subjected to EMI filtering, the direct current conversion unit consists of a direct current conversion bridge D2, a diode D3, an inductor L2, a capacitor C4 and a capacitor C5, the output of the direct current conversion bridge D2 is connected to a diode D3 and is connected to an absorption circuit through an inductor L2, one end of each of capacitors C4 and C5 is connected to the left end and the right end of the inductor L2 respectively, the other end of each capacitor C4 and C5 is connected to GND1 in a grounding mode, the absorption circuit consists of a resistor R3, a capacitor C6 and a diode D6, the resistor R3 is connected with the capacitor C6 in parallel and then connected with a diode D6 in series, the absorption circuit is connected with the two ends of the voltage input side of a transformer T1 in parallel, the positive electrode of a diode D6 is connected.
According to the embodiment of the present invention, the driving switch power supply unit may be divided into 3 sub-units, which are respectively a first driving switch power supply VCC1, a second driving switch power supply VCC2, and a third driving switch power supply VCC3, wherein the anode of the diode D9 is connected to the cathode of the diode D3, the cathode of the diode D9 is connected in series to the resistor R8, the zener diode D12 is connected in parallel to the capacitor C9 and then connected in series to the resistor R8, and the cathode of the zener diode D12 is the first driving switch power supply VCC 1; the anode of the diode D8 is connected with the cathode of the diode D1, the cathode of the diode D8 is connected with the resistor R7, the Zener diode D11 is connected with the capacitor C8 in parallel and then connected with the resistor R7 in series, and the cathode of the Zener diode D11 is VCC 2; the cathode of the diode D7 is connected to the other voltage output side of the transformer T1, the anode of the diode D7 is connected in series with the resistor R6, the zener diode D10 is connected in parallel with the capacitor C7 and then connected in series with the resistor R6, and the cathode of the zener diode D10 is the third driving switching power supply VCC 3.
According to the embodiment of the invention, the first driving switch power supply VCC1 IS connected to the voltage reference terminal Vref of the independent circulation control unit after being divided by the resistors R9 and R11, the Q terminal of the reset set trigger in the independent circulation control unit IS connected to the gate of the on-off triode Q1, the IS-1 terminal of the independent circulation control unit IS connected to the source of the on-off triode Q1, and the VC1 terminal of the independent circulation control unit IS connected to the VC1 terminal of the analog photoelectric isolation unit. A resistor R1 IS connected in series with a capacitor C1 and then connected in parallel with a diode D1, the anode of the diode D1 IS connected to the voltage output side of a transformer T1, the cathode of the diode D IS connected in series with an inductor L1, a capacitor C2 IS connected with the cathode of a diode D1, the other end of the diode D1 IS connected to the ground GND2, resistors R2 and R4 are connected in series and then connected in parallel with a capacitor C3, one end of the resistors IS connected to the right end of an inductor L1 and the load LED +, the other end of the inductors IS connected to the GND2, the connection point of the resistors R2 and R4 IS connected to the Vin end of the analog photoelectric isolation unit, the cathode of a diode D5 IS connected to the load LED +, the anode of the diode IS connected to the drain of a triode Q2 and one end of an inductor L3, the other end of the inductor L3 IS connected to the load LED-, the source of a switching triode Q2 IS connected to the ground 2, a Hall current sensing circuit CH, the third driving switch power supply VCC3 IS connected to the IS-O end of the current stabilization control unit after being connected in series through resistors R12 and R13 for voltage division, the pulse width modulation end of the pulse width modulation light adjusting unit IS connected with the pulse width modulation end of the current stabilization control unit, and the collector of the U6 in the current stabilization control unit IS connected to the grid of the on-off triode Q2.
The self-adaptive high-efficiency LED driving power supply is provided with the independent circulation control unit, so that the voltage precision can be controlled in a very small range, and the voltage distortion can be effectively inhibited; by arranging the current stabilization control unit, the current can be kept in linear continuity; the whole circuit has strong anti-interference capability, stable output and higher electric energy utilization rate.
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Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic diagram of an adaptive high-efficiency LED driving power supply according to an embodiment of the invention;
FIG. 2 shows a schematic diagram of an adaptive high efficiency LED driver power supply circuit according to an embodiment of the present invention;
FIG. 3 illustrates a circuit schematic of an independent loop control unit according to an embodiment of the present invention;
FIG. 4 shows a schematic diagram of a current stabilization control unit circuit according to an embodiment of the invention;
FIG. 5 illustrates a circuit schematic of an EMI filtering unit according to an embodiment of the present invention;
FIG. 6 is a schematic circuit diagram of a PWM light adjusting unit according to an embodiment of the present invention
Fig. 7 shows a schematic diagram of an analog opto-electronic isolation unit circuit according to an embodiment of the invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
According to an embodiment of the present invention, an adaptive high-efficiency LED driving power supply is provided, as shown in fig. 1, the LED driving power supply includes: the device comprises an EMI filtering unit, a direct current conversion unit, a switch conversion unit, a driving switch power supply unit, an independent circulation control unit, an analog photoelectric isolation unit, a current stabilization power supply output unit, a current stabilization control unit and a pulse width modulation light adjusting unit; wherein,
the EMI filtering unit, the direct current conversion unit and the switch conversion unit are sequentially connected and connected to the stabilized current power supply output unit, the output end of the switch conversion unit is connected with the driving switch power supply unit, the output end of the driving switch power supply unit is respectively connected with the independent circulation control unit, the analog photoelectric isolation unit, the stabilized current control unit and the pulse width modulation light adjusting unit, the output end of the analog photoelectric isolation unit is connected with the switch conversion unit through the independent circulation control unit, and the pulse width modulation light adjusting unit is connected to the stabilized current power supply output unit through the stabilized current control unit; the alternating current exports the switch converting unit behind EMI filter unit and direct current transform unit, and the output voltage that simulation optoelectronic isolation unit will detect is imported independent circulation control unit through simulation optoelectronic isolation, and drive switch power supply unit gives independent circulation control unit, simulation optoelectronic isolation unit, stationary flow control unit, the power supply of PWM light regulating unit respectively, and independent circulation control unit control switch converting unit exports the expectation voltage, and stationary flow control unit control stationary flow power output unit exports the expectation current, and PWM light regulating unit is right through the stationary flow control unit LED carries out the operation of adjusting luminance.
As shown in fig. 2, a main circuit input ac 220V voltage is connected to the dc conversion unit after being subjected to EMI filtering, the dc conversion unit is composed of a dc conversion bridge D2, a diode D3, an inductor L2, capacitors C4, and C5, the dc conversion bridge D2 output is connected to a diode D3 and is connected to an absorption circuit through an inductor L2, one ends of capacitors C4 and C5 are connected to the left and right ends of the inductor L2, the other end is connected to GND1, the absorption circuit is composed of a resistor R3, a capacitor C6, and a diode D6, the resistor R3 is connected in parallel with the capacitor C6 and then connected in series with the diode D6, and the absorption circuit is connected in parallel to the two ends of the voltage input side of the transformer T8. The anode of the diode D6 is connected with a switching triode Q1, the other end of the switching triode Q1 is connected with a resistor R10, and the other end of the resistor R10 is grounded GND 1.
The driving switch power supply unit can be divided into 3 subunits, namely a first driving switch power supply VCC1, a second driving switch power supply VCC2 and a third driving switch power supply VCC3, wherein the anode of a diode D9 is connected with the cathode of a diode D3, the cathode of a diode D9 is connected with a resistor R8 in series, a Zener diode D12 is connected with a capacitor C9 in parallel and then connected with a resistor R8 in series, and the cathode of the Zener diode D12 is the first driving switch power supply VCC 1; the anode of the diode D8 is connected with the cathode of the diode D1, the cathode of the diode D8 is connected with the resistor R7, the Zener diode D11 is connected with the capacitor C8 in parallel and then connected with the resistor R7 in series, and the cathode of the Zener diode D11 is VCC 2; the cathode of the diode D7 is connected to the other voltage output side of the transformer T1, the anode of the diode D7 is connected in series with the resistor R6, the zener diode D10 is connected in parallel with the capacitor C7 and then connected in series with the resistor R6, and the cathode of the zener diode D10 is the third driving switching power supply VCC 3.
The first driving switch power supply VCC1 IS connected to a voltage reference end Vref of the independent circulation control unit after being divided by resistors R9 and R11, a Q end of a reset set trigger in the independent circulation control unit IS connected with a grid electrode of the on-off triode Q1, an IS-1 end of the independent circulation control unit IS connected with a source electrode of the on-off triode Q1, and a VC1 end of the independent circulation control unit IS connected with a VC1 end of the analog photoelectric isolation unit. A resistor R1 IS connected in series with a capacitor C1 and then connected in parallel with a diode D1, the anode of the diode D1 IS connected to the voltage output side of a transformer T1, the cathode of the diode D IS connected in series with an inductor L1, a capacitor C2 IS connected with the cathode of a diode D1, the other end of the diode D1 IS connected to the ground GND2, resistors R2 and R4 are connected in series and then connected in parallel with a capacitor C3, one end of the resistors IS connected to the right end of an inductor L1 and the load LED +, the other end of the inductors IS connected to the GND2, the connection point of the resistors R2 and R4 IS connected to the Vin end of the analog photoelectric isolation unit, the cathode of a diode D5 IS connected to the load LED +, the anode of the diode IS connected to the drain of a triode Q2 and one end of an inductor L3, the other end of the inductor L3 IS connected to the load LED-, the source of a switching triode Q2 IS connected to the ground 2, a Hall current sensing circuit CH, the third driving switch power supply VCC3 IS connected to the IS-O end of the current stabilization control unit after being connected in series through resistors R12 and R13 for voltage division, the pulse width modulation end of the pulse width modulation light adjusting unit IS connected with the pulse width modulation end of the current stabilization control unit, and the collector of the U6 in the current stabilization control unit IS connected to the grid of the on-off triode Q2.
The stabilized current power supply output unit comprises a Hall current sensing circuit CHB-25NP/SP5, an on-off triode Q1, a load D4, an energy storage inductor L3 and a Schottky diode D5, wherein the inductor L3 and the Schottky diode D5 play a role of continuous current during the turn-off period of the on-off triode Q1. The detection current precision of the Hall current sensing circuit CHB-25NP/SP5 is within 0.8 percent, the output current can be accurately measured and fed back to the current stabilization control unit, and meanwhile, the output current is isolated from the control circuit.
The independent circulation control unit comprises a linear proportional-integral regulating circuit, an N1/N2 times amplifying circuit (N1/N2 is the turn ratio of the voltage output side of the voltage input side of the transformer), an adding circuit, an initializing circuit, a comparing circuit and an RS trigger circuit, wherein the linear proportional-integral regulating circuit, the N1/N2 times amplifying circuit and the adding circuit are all composed of amplifiers and peripheral circuits thereof, the initializing circuit is composed of the amplifiers, a reset switch and the peripheral circuits, the comparing circuit is composed of a comparator, and the RS trigger circuit is composed of a reset set trigger and a clock pulse generator. The independent circulation control unit obtains a reference voltage signal from the driving switch power supply unit through resistance voltage division. As shown in fig. 3, the voltage reference terminal Vref of the independent loop control unit IS connected in series with the resistor R18 and then respectively connected to the pin 3 of the amplifier U1A and the resistor R16, the other end of the resistor R16 IS connected in series with the capacitor C16 and then connected to the GND 16, the feedback voltage VC 16 IS connected in series with the resistor R16 and then connected to the pin 2 of the amplifier U1 16, the pin 2 of the amplifier IS connected to the resistor R16, the resistor R16 IS connected in series with the capacitor C16 and then connected to the pin 1 of the amplifier U1 16, the pin 1 of the amplifier U1 16 IS connected to the pin 5 of the amplifier U1 16, the pin 6 of the amplifier U1 16 IS connected to one end of the resistor R16 and connected to the GND 16 through the resistor R16, the other end of the resistor R16 IS connected to the pin 7 of the amplifier U1 16, the pin 7 of the amplifier U1 16 IS connected to the pin 10 of the amplifier U1 16 through the resistor R16, the pin 10 of the amplifier U1 16 IS connected to the GND of the resistor R16, the ground 16, the input current detection terminal IS, the two ends of the resistor R28 are respectively connected with pins 8 and 9 of the amplifier U1C, the pin 8 of the amplifier U1C is connected with the pin 12 of the amplifier U1D through the resistor R21, the pin 12 is grounded GND1, the resistor R17 is connected with the capacitor C11 in series and then connected with the pins 12 and 14 of the amplifier U1D after being connected with the reset switch S1 in parallel, the resistor R26, one end of the R27 is connected with a 14 pin of an amplifier U1D after being connected in series, the other end of the R27 is connected with a GND1, the connection ends of a resistor R26 and a resistor R27 are connected with a 13 end of an amplifier U1D, a 14 pin of the amplifier U1D is connected with a 3 pin of a comparator U2A through a resistor R22, a 7 pin of the amplifier U1B is connected with a 2 pin of a comparator U2A through a resistor R25, a 1 pin of a comparator U2A is connected with an RN end of a reset set trigger, an SN end of the reset set trigger is connected with a clock pulse signal, a QN end of the reset set trigger is connected with a reset end of a reset switch S1, and a Q end of the reset set trigger is connected with. The independent circulation control unit is connected with the current sampling resistor of the switch conversion unit, samples the input current of the switch conversion unit, and adjusts the control signal according to the sampling signal. The independent circulation control unit samples the output voltage through the analog photoelectric isolation unit and adjusts the control signal according to the sampling signal. The independent circulation control unit controls the switch conversion unit, input distortion can be effectively inhibited, the precision and the response speed of output voltage are improved, a signal for controlling the on-off of the on-off triode Q1 is obtained according to an expected voltage signal by sampling an input current signal and an output voltage signal, and when the input voltage has distortion, the average value of the output voltage can be equal to a reference value in a switching period, so that the input distortion is inhibited.
The independent circulation control unit controls the output voltage, the voltage precision can be controlled within 1%, the output voltage can be equal to a voltage reference value in a switching period under the condition that the input end voltage is distorted, and the influence caused by the distortion of the input voltage is effectively inhibited.
The current stabilization control unit comprises a subtraction circuit, a linear proportional-integral regulating circuit, a proportional regulating circuit, a comparison circuit, a NAND gate and a photoelectric isolation circuit. The subtracting circuit, the linear proportional integral regulating circuit are composed of an amplifier and a peripheral circuit thereof, the proportional regulating circuit is composed of an amplifier, an amplitude limiter and a peripheral circuit, and the comparing circuit is composed of a comparator, a triangular wave generator and a peripheral circuit. And the current stabilization control unit obtains the magnitude of the output reference current from the driving switch power supply unit through resistance voltage division. And the stabilized current control unit samples the output current through a Hall current induction circuit of the stabilized current power supply output unit and adjusts the control signal according to the sampling signal. As shown in fig. 4, the desired load current terminal IS-O of the current stabilization control unit IS connected to the 3 pin of the amplifier U4A through a resistor R33, the 3 pin of the amplifier U4A IS connected to the GND3 through a resistor R39, the 2 pin of the amplifier U4A IS connected to the 8 pin of the amplifier U4C through a resistor R37, and the resistor R41 IS connected in parallel to the 1 and 2 pins of the amplifier U4A. A pin 1 of the amplifier U4A IS connected to a pin 5 of the amplifier U4B through a resistor R35, a resistor R32 IS connected in series with a capacitor C13, one end of the resistor IS grounded to GND3, the other end of the resistor IS connected to a pin 5 of the amplifier U4B, a load current IS-O IS connected to a pin 6 of the amplifier U4B through a resistor R B, the capacitor C B IS connected in series with the resistor R B and then connected to pins 6 and 7 of the amplifier U4B in parallel, a pin 7 of the amplifier U4B IS connected to GND B through a resistor R B, the load current IS-O IS connected to a pin 10 of the amplifier U4B through a resistor R B and simultaneously connected to an input end of an integrating limiter JF B, an output end of the integrating limiter JF B IS connected to a pin 9 of the amplifier U4B through a resistor R B, the output end of the integrating limiter JF B IS connected to a pin 8 of the amplifier U4B through a resistor R B, the pin 3 of the comparator U7B IS connected to a pin B after the resistor R B IS connected in series with, the pulse width modulation input end is connected to the A end of the NAND gate U5, the output end Y of the NAND gate U5 is connected to the cathode end of the light emitting diode of the photoelectric isolation circuit U6 through a resistor R44, the anode end of the light emitting diode is grounded GND3, the second driving switch power supply VCC2 is connected to the collector of the triode through a resistor R43, the collector output is connected to the grid of the on-off triode Q2, and the emitter is grounded GND 2.
The current stabilization control unit adopts an anti-saturation controller, and the anti-saturation can effectively prevent the integral saturation phenomenon from occurring in the control process, so that the controller maintains linear continuity, and the purposes of constant output current and improving control precision are achieved. The current stabilizing control unit adopts a condition effect technology anti-saturation algorithm, so that the current of the current stabilizing power supply output unit maintains linear continuity, overshoot is reduced, the control precision is improved, the system has better dynamic quality and steady-state precision, and the precision of the output current is improved.
As shown in fig. 5, the ac input terminal ACI + of the EMI filter unit is connected to the left upper end of the common mode choke T2 through the shock resistance RT1, the ac input terminal ACI-is connected to the left lower end of the common mode choke T1 through the fuse F1, and the varistor R47 is connected in parallel to the safety capacitor C15 and then connected in parallel to the left upper end and the left lower end of the common mode choke T2. The upper right end and the lower right end of the common mode choke coil T2 are connected with a safety capacitor C16 in parallel and then are respectively connected with an alternating current output end ACO + and an alternating current output end ACO-.
The pulse width modulation light adjusting unit comprises a 555 timer, resistors R51 and R53, a variable resistor R52, diodes D13 and D14, and capacitors C17 and C18, and the duty ratio of output pulses can be adjusted by adjusting the size of the variable resistor R52, so that the purpose of dimming is achieved. As shown in fig. 6, the third driving switching power supply VCC3 is respectively connected to pins 4 and 8 of the 555 timer U11 and one end of the resistor R51, the other end of the resistor R51 is connected to one end of the variable resistor R52, the other end of the variable resistor R52 is connected to the cathode of the diode D14, the middle end of the variable resistor R52 is connected to the pin 7 of the 555 timer and the anode of the diode D13, the cathode of the diode D13 and the anode of the diode D14 are connected to one end of the pin 6 and the pin 2 of the 555 timer and the end of the capacitor C18, the other end of the capacitor C18 is connected to the GND3, one end of the capacitor C17 is connected to the pin 5 of the 555 timer U11, the other end of the capacitor C3 is connected to the pin 1 of the GND 11, and the pin 1 is connected to the GND.
The analog photoelectric isolation unit comprises a linear photoelectric isolation circuit HCNR201, an input resistor R50, a feedback resistor R48 and a voltage-stabilizing adjusting resistor R49, and the detected output voltage is input to the VC1 end of the independent circulation control unit through analog photoelectric isolation. As shown in fig. 7, the detection voltage Vin is connected to pin 2 of the amplifier U8A and pin 3 of the optoelectronic isolation circuit U9 through a resistor R50, pin 3 of the amplifier U8A is grounded to GND2, pin 1 is connected to pin 1 of the optoelectronic isolation circuit U9 through a resistor R49, pin 4 and pin 5 of the optoelectronic isolation circuit U9 are grounded to GND2, pin 2 is connected to VCC2, pin 7 and pin 8 are floating, pin 6 is connected to pin 2 of the amplifier U10A, pin 2 of the amplifier U10A is connected to pin 1 of the amplifier U10A through a resistor R48 to output the feedback voltage VC1, and pin 3 of the amplifier U10A is grounded to GND 1.
The detection voltage Vin is isolated by the photoelectric isolation circuit U9 and then fed back to the independent circulation control unit, so that the main circuit and the control circuit are effectively isolated. In actual operation, the resistance values of R50 and R48 can be equal in the design process of the photoelectric isolation circuit, and input and output equal-size isolation can be realized.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. An adaptive high-efficiency LED drive power supply, comprising: the device comprises an EMI filtering unit, a direct current conversion unit, a switch conversion unit, a driving switch power supply unit, an independent circulation control unit, an analog photoelectric isolation unit, a current stabilization power supply output unit, a current stabilization control unit and a pulse width modulation light adjusting unit; wherein,
the EMI filtering unit, the direct current conversion unit and the switch conversion unit are sequentially connected and are connected to the stabilized current power supply output unit, the output end of the switch conversion unit is connected with the driving switch power supply unit, the output end of the driving switch power supply unit is respectively connected with the independent circulation control unit, the analog photoelectric isolation unit, the stabilized current control unit and the pulse width modulation light adjusting unit, the output end of the analog photoelectric isolation unit is connected with the switch conversion unit through the independent circulation control unit, and the pulse width modulation light adjusting unit is connected to the stabilized current power supply output unit through the stabilized current control unit; the alternating current exports the switch converting unit behind EMI filter unit and direct current transform unit, and the output voltage that simulation optoelectronic isolation unit will detect is imported independent circulation control unit through simulation optoelectronic isolation, and drive switch power supply unit gives independent circulation control unit, simulation optoelectronic isolation unit, stationary flow control unit, the power supply of PWM light regulating unit respectively, and independent circulation control unit control switch converting unit exports the expectation voltage, and stationary flow control unit control stationary flow power output unit exports the expectation current, and PWM light regulating unit is right through the stationary flow control unit LED carries out the operation of adjusting luminance.
2. The driving power supply of claim 1, wherein an input ac 220V voltage is coupled to the dc conversion unit after EMI filtering, and the dc conversion unit comprises a dc conversion bridge D2, a diode D3, an inductor L2, a capacitor C4, and a capacitor C5.
3. A driving power supply according to claim 2, wherein the output of the DC conversion bridge D2 is connected to a diode D3 and is connected to an absorption circuit through an inductor L2, one end of each of capacitors C4 and C5 is connected to the left and right ends of the inductor L2, the other end of each of the capacitors is connected to the GND1, the absorption circuit is composed of a resistor R3, a capacitor C6 and a diode D6, the resistor R3 is connected in parallel with the capacitor C6 and then connected in series with the diode D6, the absorption circuit is connected in parallel with the two ends of the voltage input side of the transformer T1, the anode of the diode D6 is connected to an on-off triode Q1, the other end of the on-off triode Q1 is connected to a resistor R35.
4. A driving power supply according to claim 3, wherein the driving switch power supply unit is divided into 3 sub-units, which are respectively a first driving switch power supply VCC1, a second driving switch power supply VCC2, and a third driving switch power supply VCC3, an anode of the diode D9 is connected to a cathode of the diode D3, a cathode of the diode D9 is connected in series with the resistor R8, the zener diode D12 is connected in parallel with the capacitor C9 and then connected in series with the resistor R8, and a cathode of the zener diode D12 is the first driving switch power supply VCC 1; the anode of the diode D8 is connected with the cathode of the diode D1, the cathode of the diode D8 is connected with the resistor R7, the Zener diode D11 is connected with the capacitor C8 in parallel and then connected with the resistor R7 in series, and the cathode of the Zener diode D11 is VCC 2; the cathode of the diode D7 is connected to the other voltage output side of the transformer T1, the anode of the diode D7 is connected in series with the resistor R6, the zener diode D10 is connected in parallel with the capacitor C7 and then connected in series with the resistor R6, and the cathode of the zener diode D10 is the third driving switching power supply VCC 3.
5. The driving power supply of claim 4, wherein the first driving switching power supply VCC1 IS divided by resistors R9 and R11 and then connected to a voltage reference terminal of the independent circulation control unit, a Q terminal of the reset set flip-flop in the independent circulation control unit IS connected to a gate of the on-off transistor Q1, an IS-1 terminal of the independent circulation control unit IS connected to a source of the on-off transistor Q1, and a VC1 terminal of the independent circulation control unit IS connected to a VC1 terminal of the analog photoelectric isolation unit; a resistor R1 IS connected in series with a capacitor C1 and then connected in parallel with a diode D1, the anode of the diode D1 IS connected to the voltage output side of a transformer T1, the cathode of the diode D IS connected in series with an inductor L1, a capacitor C2 IS connected with the cathode of a diode D1, the other end of the diode D1 IS connected to the ground GND2, resistors R2 and R4 are connected in series and then connected in parallel with a capacitor C3, one end of the resistors IS connected to the right end of an inductor L1 and the load LED +, the other end of the inductors IS connected to the GND2, the connection point of the resistors R2 and R4 IS connected to the Vin end of the analog photoelectric isolation unit, the cathode of a diode D5 IS connected to the load LED +, the anode of the diode IS connected to the drain of a triode Q2 and one end of an inductor L3, the other end of the inductor L3 IS connected to the load LED-, the source of a switching triode Q2 IS connected to the ground 2, a Hall current sensing circuit CH, the third driving switch power supply VCC3 IS connected to the IS-O end of the current stabilization control unit after being connected in series through resistors R12 and R13 for voltage division, the pulse width modulation end of the pulse width modulation light adjusting unit IS connected with the pulse width modulation end of the current stabilization control unit, and the collector of the U6 in the current stabilization control unit IS connected to the grid of the on-off triode Q2.
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| CN201510005160.XA CN104470160A (en) | 2015-01-06 | 2015-01-06 | Self-adaption efficient LED driving power supply |
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| CN201510005160.XA CN104470160A (en) | 2015-01-06 | 2015-01-06 | Self-adaption efficient LED driving power supply |
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