CN103298223A

CN103298223A - Step-down piezoelectric transformer driving light-emitting technology method of LED (Light Emitting Diode) and OLED (Organic Light Emitting Diode)

Info

Publication number: CN103298223A
Application number: CN2013102842495A
Authority: CN
Inventors: 刘方旭
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-07-09
Filing date: 2013-07-09
Publication date: 2013-09-11

Abstract

The invention discloses a step-down piezoelectric transformer driving light-emitting technology method of an LED (Light Emitting Diode) and an OLED (Organic Light Emitting Diode). A direct current power supply is provided for a half bridge inverter circuit after an alternating current power supply passes through a rectification filter circuit; the alternating current power supply passes through a driving and control power supply circuit to provide low voltage direct current power supplies for a PWM (Pulse Width Modulation) control circuit and an MOSFET (Metal Oxide Semiconductor Field Effect Transistor) driving circuit respectively; sampling is performed on current of the half bridge inverter circuit through the PWM control circuit; sampling is performed on output terminal voltage of a step-down piezoelectric transformer circuit through an output feedback circuit; and sampling signals are input into the PWM control circuit to be processed and then enter into the MOSFET driving circuit to achieve driving control on the half bridge inverter circuit and over-voltage protection on loads and further drive the loads to emit light.

Description

The step-down piezoelectricity transformation of a kind of LED ∕ OLED drives the luminous technics method

Technical field

The present invention relates to LED ∕ OLED and drive the luminescence technology field, refer to that especially the step-down piezoelectricity transformation of a kind of LED ∕ OLED drives the luminous technics method.

Background technology

The electrodeless light-emitting diode of LED() and OLED(utmost point light-emitting diode is arranged) as novel semiconductor lighting technology, be called as the 4th generation lighting source or green light source, compare traditional illuminating product, it has energy-conservation, environmental protection, life-span is long, characteristics such as volume is little, can be widely used in various indications, show, decorate, backlight, field such as general lighting and urban landscape, the material that OLED uses has the branch of little molecule and macromolecule, OLED has very large light-emitting area, the heat that produces during work can in time dissipate, need not heat abstractor, OLED can be very frivolous, save space cost, but the transparent characteristic of OLED, can realize the complete incogitable application mode of conventional lamp, expanded the application space of OLED greatly, in addition, OLED compare with LCD have ultra-thin, self-luminous, the visual angle is wide, response is fast, the luminous efficiency height, thermal adaptability is good, driving voltage is low, energy consumption is low, low cost and other advantages.

Along with the utilization of LED and OLED to miniaturization, sheet typeization and integrated direction development, traditional shielding wire seems that to this challenge some is unable to do what one wishes around electromagnetism transformation type of drive, using shielding wire in the system of electromagnetism transformation driving LED and OLED, electromagnetic transformers has occupied sizable volume, the electromagnetic interference that electromagnetic transformers produces also is a very stubborn problem concerning system.And the step-down piezoelectric transformer is a kind of PZT (piezoelectric transducer), it utilizes the energy converting between mechanical mechanism of piezoelectric ceramic, electric energy with input is converted to mechanical energy earlier, again mechanical energy is converted to electric energy, the step-down piezoelectric transformer is compared around electromagnetic transformers with existing traditional shielding wire, advantages such as it has, and volume is little, efficient is high, no electromagnetic interference, good output waveform, high temperature resistant, saving non-ferrous metal, simple in structure, easy batch process.

Summary of the invention

The step-down piezoelectricity transformation of a kind of LED ∕ of the present invention OLED drives the luminous technics method, it is characterized in that having overcome the deficiency of above-mentioned prior art, the luminescent method that provides a kind of LED ∕ OLED to use step-down piezoelectricity transformation to drive has the characteristics of little, the no electromagnetic interference of volume, good output waveform, high temperature resistant, saving non-ferrous metal, simple in structure, easy batch process etc.

To achieve these goals; technical solution of the present invention is: the circuit that the step-down piezoelectricity transformation of a kind of LED ∕ OLED drives the luminous technics method is by AC power; current rectifying and wave filtering circuit; half-bridge inversion circuit; step-down piezoelectricity transforming circuit; the output feedback circuit; pwm control circuit; drive and the control power circuit; MOSFET drive circuit and load are formed; AC power is through behind the current rectifying and wave filtering circuit; provide DC power supply to half-bridge inversion circuit; AC power provides low-voltage dc power supply to pwm control circuit and MOSFET drive circuit respectively through overdriving and controlling power circuit; pwm control circuit is sampled to the electric current of half-bridge inversion circuit; the output feedback circuit is sampled to the output end voltage of step-down piezoelectricity transforming circuit; sampled signal is all imported pwm control circuit and is entered the MOSFET drive circuit after treatment; realization is to the driving control of half-bridge inversion circuit and the overvoltage protection of load, and it is luminous further to drive load.

Described AC power is 220V electric main used in everyday.

Described current rectifying and wave filtering circuit is made up of cartridge fuse, rectifier bridge, electrochemical capacitor and resistance, cartridge fuse is serially connected with the live wire end of AC power, electrochemical capacitor and resistance parallel connection, its two ends are connected to positive pole and the negative pole of rectifier bridge, and two other end points of rectifier bridge is connected to live wire end and the zero line side of AC power.

Described driving and control power circuit are made up of resistance, electric capacity, rectifier bridge, voltage stabilizing didoe and three-terminal voltage-stabilizing pipe, and the MOSFET drive IC is controlled the working power that IC provides different voltages with PWM.

Described half-bridge inversion circuit is made up of MOSFET, diode and resistance.

Described step-down piezoelectricity transforming circuit is made up of step-down PT, rectifier bridge, resistance, electrochemical capacitor and thermistor.

Described output feedback circuit adopts the photoelectric coupler isolation sampling, is made up of photoelectrical coupler, electric capacity and resistance.

Described pwm control circuit is selected from single chip circuit, PWM control IC circuit or microcontroller circuit, preferred PWM control IC circuit.

Described MOSFET drive circuit is made up of MOSFET drive IC, resistance, electric capacity and diode.

Described load is OLED illuminating device or led array, and further, described led array is to be in series by identical LED, and is perhaps in parallel earlier by identical LED, and then is one another in series and forms.

The invention has the beneficial effects as follows: luminous by using step-down piezoelectricity transformation to drive LED ∕ OLED; it is big and produce problem such as electromagnetic interference around the volume of electromagnetic transformers to overcome traditional shielding wire; have the efficient height, high temperature resistant, save non-ferrous metal and the short circuit advantage of protection etc. automatically; and since the input and output of step-down piezoelectricity transformation not altogether; input and output are isolated, and have further improved fail safe.

Description of drawings

Below in conjunction with the drawings and specific embodiments the present invention is further described.

Accompanying drawing 1 is circuit block diagram of the present invention.

Accompanying drawing 2 is embodiments of the invention 1 circuit theory diagrams.

Accompanying drawing 3 is embodiments of the invention 2 circuit theory diagrams.

Among the figure: 10, AC power, 20, current rectifying and wave filtering circuit, 30, half-bridge inversion circuit, 40, step-down piezoelectricity transforming circuit, 50, the output feedback circuit, 60, pwm control circuit, 70, drive and the control power circuit, 80, the MOSFET drive circuit, 80, load.

Embodiment

Embodiment 1

Shown in accompanying drawing 1 and accompanying drawing 2, the step-down piezoelectricity transformation of a kind of LED ∕ OLED drives the circuit of luminous technics method and is made up of AC power 10, current rectifying and wave filtering circuit 20, half-bridge inversion circuit 30, step-down piezoelectricity transforming circuit 40, output feedback circuit 50, pwm control circuit 60, driving and control power circuit 70, MOSFET drive circuit 80 and load 90, wherein, AC power 10 is 220V electric mains used in everyday; Current rectifying and wave filtering circuit 20 is made up of cartridge fuse FU, rectifier bridge BRG1, electrochemical capacitor C2 and resistance R 8, cartridge fuse FU is connected between 3 ends of the live wire of AC power 10 and BRG1, electrochemical capacitor C2 and resistance R 8 parallel connections, its two ends are connected to 2 ends and 4 ends of rectifier bridge BRG1, and 1 end of rectifier bridge BRG1 and 3 ends are connected to live wire and the zero line of AC power 10; Drive and control power circuit 70 is made up of resistance R 1～R3, capacitor C 1, electrochemical capacitor C2, rectifier bridge BRG2, voltage stabilizing didoe D1 and three-terminal voltage-stabilizing pipe U1, the U2 that U3 and the PWM of MOSFET drive IC controlled IC provides the working power of different voltages; Half-bridge inversion circuit 30 is made up of MOSFET pipe Q1 and Q2, diode D3 and D4 and resistance R 9～R11; Step-down piezoelectricity transforming circuit 40 is made up of step-down PT, rectifier bridge BRG3, resistance R 13, electrochemical capacitor C3 and thermistor PTC; Output feedback circuit 50 adopts the photoelectric coupler isolation sampling, and this circuit is made up of photoelectrical coupler OPT, capacitor C 5, resistance R 7 and R12; Pwm control circuit 60 is made up of U2, resistance R 4 and the R5 of PWM control IC; MOSFET drive circuit 80 is made up of U3, capacitor C 6 and the diode D2 of MOSFET drive IC; Load is led array.

The two ends of resistance R 1 are connected to 3 ends of rectifier bridge BRG1 and 1 end of rectifier bridge BRG2 respectively, capacitor C 1 is in parallel with

resistance R

1,3 ends of rectifier bridge BRG2 are connected with 1 end of rectifier bridge BRG1,2 ends of rectifier bridge BRG1 are connected with the source electrode of MOSFET pipe Q1, the equal ground connection of 4 ends of 4 ends of rectifier bridge BRG2 and rectifier bridge BRG1,2 ends of rectifier bridge BRG2 connect the VCC end of U3 and the VIN end of U1 respectively, voltage stabilizing didoe D1, resistance R 2 and electrochemical capacitor C4 are connected between 2 ends and 4 ends of rectifier bridge BRG2 successively, resistance R 3 is connected between the VOUT end and GND end of U1, the GND end ground connection of U1, the VOUT end of U1 is connected the vdd terminal of U2 and the output 4 of photoelectrical coupler OPT by resistance R 4 respectively with R7, the RT end of U2 is by resistance R 5 ground connection, the OUT end of U2 connects the SD end of U3 by resistance R 6, the drain electrode of the SEN termination MOSFET pipe Q2 of U2, and by resistance R 11 ground connection, the FB end of U2 is connected with the output 4 of photoelectrical coupler OPT, capacitor C 5 is connected between the output 4 and earth terminal 6 of photoelectrical coupler OPT, diode D2 is connected between the VCC end and VB end of U3, capacitor C 6 is connected between VS end and the VB end, the HO end of U3 is connected the grid of MOSFET pipe Q1 and the grid of MOSFET pipe Q2 by resistance R 9 respectively with the LO end with R10, the two ends of diode D3 and D4 are connected with the two ends of resistance R 9 and R10 respectively, the COM end ground connection of U3, the contact of the drain electrode of MOSFET pipe Q1 and the source electrode of MOSFET pipe Q2 is connected with the input 1 of step-down PT with the VS end of U3 respectively, earth terminal 3 ground connection of step-down PT input 1 homonymy, the output 4 of step-down PT and output 2 are connected 1 end and 3 ends of rectifier bridge BRG3 respectively, resistance R 13 and electrochemical capacitor C3 are connected between 2 ends and 4 ends of rectifier bridge BRG3, thermistor PTC is with after led array is connected, be connected in the two ends of

resistance R

13,2 ends of rectifier bridge BRG3 connect the sampling input 1 of photoelectrical coupler OPT by resistance R 12, the earth terminal 2 of photoelectrical coupler OPT sampling input 1 homonymy connects 4 ends of rectifier bridge BRG3, the 4 end ground connection of rectifier bridge BRG3.

During work; AC power 10 is through behind the current rectifying and wave filtering circuit 20; provide DC power supply to half-bridge inversion circuit 30; AC power 10 is after overdriving and controlling power circuit 70 step-downs; VCC end to U3 in the vdd terminal of U2 in the pwm control circuit 60 and the MOSFET drive circuit 80 provides low-voltage dc power supply respectively; the SEN of U2 end is sampled to the electric current of half-bridge inversion circuit 30 in the pwm control circuit 60; output 2 voltages of the step-down piezoelectricity of the photoelectrical coupler OPT transforming circuit 40 in the output feedback circuit 50 are sampled; sampled signal is all imported in the pwm control circuit 60 by SEN end and the FB end of U2; sampled signal enters in the MOSFET drive circuit 80 by the Enable Pin SD of U3 after treatment; MOSFET drive circuit 80 passes through MOSFET grid drive end HO and grid drive end HO realization again to the overvoltage protection of driving control and the load 90 of half-bridge inversion circuit 30, and further driving LED array light-emitting.

Embodiment 2

Shown in accompanying drawing 1 and accompanying drawing 3, the step-down piezoelectricity transformation of a kind of LED ∕ OLED drives the circuit of luminous technics method and is made up of AC power 10, current rectifying and wave filtering circuit 20, half-bridge inversion circuit 30, step-down piezoelectricity transforming circuit 40, output feedback circuit 50, pwm control circuit 60, driving and control power circuit 70, MOSFET drive circuit 80 and load 90, wherein, AC power 10 is 220V electric mains used in everyday; Current rectifying and wave filtering circuit 20 is made up of cartridge fuse FU, rectifier bridge BRG1, electrochemical capacitor C2 and resistance R 8, cartridge fuse FU is connected between 3 ends of the live wire of AC power 10 and BRG1, electrochemical capacitor C2 and resistance R 8 parallel connections, its two ends are connected to 2 ends and 4 ends of rectifier bridge BRG1, and 1 end of rectifier bridge BRG1 and 3 ends are connected to live wire and the zero line of AC power 10; Drive and control power circuit 70 is made up of resistance R 1～R3, capacitor C 1, electrochemical capacitor C2, rectifier bridge BRG2, voltage stabilizing didoe D1 and three-terminal voltage-stabilizing pipe U1, the U2 that U3 and the PWM of MOSFET drive IC controlled IC provides the working power of different voltages; Half-bridge inversion circuit 30 is made up of MOSFET pipe Q1 and Q2, diode D3 and D4 and resistance R 9～R11; Step-down piezoelectricity transforming circuit 40 is made up of step-down PT, rectifier bridge BRG3, resistance R 13, electrochemical capacitor C3 and thermistor PTC; Output feedback circuit 50 adopts the photoelectric coupler isolation sampling, and this circuit is made up of photoelectrical coupler OPT, capacitor C 5, resistance R 7 and R12; Pwm control circuit 60 is made up of U2, the resistance R 4～R6 of PWM control IC and R14～R22, diode D5 and D6, capacitor C 7～C16 and triode Q3; MOSFET drive circuit 80 is made up of U3, capacitor C 6 and the diode D2 of MOSFET drive IC; Load is the OLED illuminating device

resistance R

1,3 ends of rectifier bridge BRG2 are connected with 1 end of rectifier bridge BRG1,2 ends of rectifier bridge BRG1 are connected with the source electrode of MOSFET pipe Q1, the equal ground connection of 4 ends of 4 ends of rectifier bridge BRG2 and rectifier bridge BRG1,2 ends of rectifier bridge BRG2 connect the VCC end of U3 and the VIN end of U1 respectively, voltage stabilizing didoe D1, resistance R 2 and electrochemical capacitor C4 are connected between 2 ends and 4 ends of rectifier bridge BRG2 successively, resistance R 3 is connected between the VOUT end and GND end of U1, the GND end ground connection of U1, the VOUT end of U1 is connected the pin two 0 of U2 and the output 4 of photoelectrical coupler OPT, the pin 5 of U2 by resistance R 14 respectively with R7, pin 9, pin one 2, pin one 3, pin one 4 and pin two 0 are respectively by capacitor C 14, C12, C8, C11, C9 and C16 ground connection , Capacitor C 12 is connected between the pin one 5 and pin one 6 of U2, the pin two ground connection of U2, and resistance R 16 is connected between the pin two and pin one 6 of U2 ,The pin one 8 of U2 connects the base stage of triode Q3 by resistance R 15, the collector electrode of triode Q3 is connected by resistance R 14 with the pin two of U2 0, the emitter of triode Q3 is connected with the pin one of U2 6, the pin one of U2 is connected with the LIN end with the HIN end of U2 respectively with pin 3, the pin 4 of U2, pin 7, pin 8 and pin one 0 are respectively by resistance R 5, R19, R6 and R21 ground connection, be connected to the two ends of resistance R 5 after resistance R 4 and capacitor C 13 series connection, diode D5 is connected to the two ends of resistance R 5, the pin 7 of U2 is connected with resistance R 18 again, the other end of resistance R 18 respectively with capacitor C 15, resistance R 17 is connected with diode D6, the other end ground connection of capacitor C 15, the other end of resistance R 17 connects the pin 6 of U2, the other end of diode D6 is connected with the drain electrode of resistance R 20 with R11 and MOSFET pipe Q2 respectively, the other end ground connection of resistance R 20 and R11, the pin 4 of U2 also connects the output 4 of photoelectrical coupler OPT by resistance R 22, capacitor C 7 is connected between the pin 5 and pin 6 of U2, capacitor C 5 is connected between the output 4 and earth terminal 6 of photoelectrical coupler OPT, diode D2 is connected between the VCC end and VB end of U3, capacitor C 6 is connected between VS end and the VB end, the HO end of U3 is connected the grid of MOSFET pipe Q1 and the grid of MOSFET pipe Q2 by resistance R 9 respectively with the LO end with R10, the two ends of diode D3 and D4 are connected with the two ends of resistance R 9 and R10 respectively, the COM end ground connection of U3, the contact of the drain electrode of MOSFET pipe Q1 and the source electrode of MOSFET pipe Q2 is connected with the input 1 of step-down PT with the VS end of U3 respectively, earth terminal 3 ground connection of step-down PT input 1 homonymy, the output 4 of step-down PT and output 2 are connected 1 end and 3 ends of rectifier bridge BRG3 respectively, resistance R 13 and electrochemical capacitor C3 are connected between 2 ends and 4 ends of rectifier bridge BRG3, thermistor PTC is with after the OLED illuminating device is connected, be connected in the two ends of

resistance R

During work; AC power 10 is through behind the rectifying and wave-filtering; provide DC power supply to half-bridge inversion circuit 30; AC power 10 is through overdriving and controlling power circuit 70 and carry out step-down; VCC end to U3 in the vdd terminal of U2 in the pwm control circuit 60 and the MOSFET drive circuit 80 provides low-voltage dc power supply respectively; the electric current of 6 pairs of half-bridge inversion circuits 30 of pin of U2 is sampled in the pwm control circuit 60; output 2 voltages of the step-down piezoelectricity of the photoelectrical coupler OPT transforming circuit 40 in the output feedback circuit 50 are sampled; sampled signal is all imported among the U2 of pwm control circuit 60 by pin 6 and the pin 4 of U2; sampled signal enters in the MOSFET drive circuit 80 by control end HIN and the control end LIN of U3 after treatment; MOSFET drive circuit 80 passes through MOSFET grid drive end HO and grid drive end LO realization again to the overvoltage protection of driving control and the load 90 of half-bridge inversion circuit 30, and further the driving OLED illuminating device is luminous.

The above; execution mode only is that preferred implementation of the present invention is described; be not that scope of the present invention is limited; under the prerequisite of the spirit that does not break away from the technology of the present invention; various distortion and improvement that this area engineers and technicians make technical scheme of the present invention all should fall in the definite protection range of claims of the present invention.

Claims

1. the step-down piezoelectricity transformation of a LED ∕ OLED drives the luminous technics method; it is characterized in that: the described circuit that utilizes step-down piezoelectricity transformation to drive the luminescent method of LED ∕ OLED is by AC power; current rectifying and wave filtering circuit; half-bridge inversion circuit; step-down piezoelectricity transforming circuit; the output feedback circuit; pwm control circuit; drive and the control power circuit; MOSFET drive circuit and load are formed; AC power is through behind the current rectifying and wave filtering circuit; provide DC power supply to half-bridge inversion circuit; AC power provides low-voltage dc power supply to pwm control circuit and MOSFET drive circuit respectively through overdriving and controlling power circuit; pwm control circuit is sampled to the electric current of half-bridge inversion circuit; the output feedback circuit is sampled to the output end voltage of step-down piezoelectricity transforming circuit; sampled signal is all imported pwm control circuit and is entered the MOSFET drive circuit after treatment; realization is to the driving control of half-bridge inversion circuit and the overvoltage protection of load, and it is luminous further to drive load.

2. the step-down piezoelectricity transformation of a kind of LED ∕ OLED according to claim 1 drives the luminous technics method, it is characterized in that: described driving and control power circuit are made up of resistance, electric capacity, rectifier bridge, voltage stabilizing didoe and three-terminal voltage-stabilizing pipe, and the MOSFET drive IC is controlled the working power that IC provides different voltages with PWM; Described half-bridge inversion circuit is made up of MOSFET, diode and resistance; Described step-down piezoelectricity transforming circuit is made up of step-down PT, rectifier bridge, resistance, electrochemical capacitor and thermistor; Described output feedback circuit adopts the photoelectric coupler isolation sampling, is made up of photoelectrical coupler, electric capacity and resistance; Described pwm control circuit is selected from single chip circuit, PWM control IC circuit or microcontroller circuit, preferred PWM control IC circuit; Described MOSFET drive circuit is made up of MOSFET drive IC, resistance, electric capacity and diode; Described load is OLED illuminating device or led array, and further, described led array is to be in series by identical LED, and is perhaps in parallel earlier by identical LED, and then is one another in series and forms.