CN107041035A - The measure and control device of LED electrical characteristic - Google Patents
The measure and control device of LED electrical characteristic Download PDFInfo
- Publication number
- CN107041035A CN107041035A CN201710278999.XA CN201710278999A CN107041035A CN 107041035 A CN107041035 A CN 107041035A CN 201710278999 A CN201710278999 A CN 201710278999A CN 107041035 A CN107041035 A CN 107041035A
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- current
- circuit
- led
- voltage
- chip microcomputer
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The present invention relates to a kind of measure and control device of LED electrical characteristic, including the drive circuit and single-chip microcomputer detection circuit being connected respectively with LED；Described drive circuit includes antisurge protection module, EMI filtration modules, full-bridge rectification module, inverse-excitation type conversion module, output rectification filter module, current and voltage feedback feedback module and PWM controller；Stable electric current can be obtained the invention enables LED, and produces highest output light flux.Meanwhile, single-chip microcomputer detection circuit can realize the real-time monitoring to LED, so that LED drive circuit controls the size of LED current in the case where the factor such as input voltage and environment temperature changes in the best way.
Description
Technical field
The present invention relates to field of switch power, more particularly to a kind of LED electrical characteristics measure and control device.
Background technology
The characteristics of LED lamp is by its low in energy consumption, long lifespan, brightness high and environmental protection, overcome traditional fluorescent lamp,
The high energy consumptions such as incandescent lamp, short life, the shortcoming for polluting environment, become the focus of research, are gradually popularized in illumination market, but mesh
Preceding in the market has some LED drive powers with low quality, causes the reduction that LED overall circuit efficiencies are very low, heating is serious, serious
The efficiency and reliability of whole illuminator.In addition, LED is in luminescence process, still there is portion of energy conversion for heat energy, greatly
The heat-sinking capability of power LED turns into influence one of its photoelectric properties and the key factor in life-span.Only resolving manufacturing technology
Under two major premises of drive circuit technology, LED product could more quickly develop.Research shows, the light decay of LED with
LED voltage, electric current are relevant with PN junction temperature, in the prior art, also voltage, electricity without a collection voltage stabilizing, current stabilization and LED
Road, temperature monitoring are in the LED electrical characteristic measure and control devices of one.
The content of the invention
In order to solve the above problems, it is an object of the present invention to provide a kind of LED electrical characteristics measure and control device, solve in the prior art
The voltage of LED driving power supply, electric current, temperature are unstable, cause LED heating serious, the problem of luminous efficiency is low.
The technical scheme is that：
The measure and control device of LED electrical characteristic, described measure and control device includes the drive circuit and monolithic being connected respectively with LED
Machine examination slowdown monitoring circuit；
Described drive circuit includes antisurge protection module, EMI filtration modules, full-bridge rectification module, inverse-excitation type and becomes mold changing
Block, output rectification filter module, current and voltage feedback feedback module and PWM controller；85V ~ 265V electric main access is anti-
Surge protection module, electric current is by entering EMI filtration modules after antisurge protection module；EMI filtration modules suppress following stage
Power circuit produces electromagnetic interference and enters utility grid, while preventing the electromagnetic interference of utility grid from entering late-class circuit；EMI is filtered
The alternating current of ripple module output is made into after DC current into full bridge rectifier sends into inverse excitation type converter progress power change
Change；DC current after inverse excitation type converter power conversion is output to LED string after output rectification filter module；Described electricity
The DC current that output rectification filter module is exported is fed back to PWM controller, PWM controller root by current voltage closed loop feedback module
According to the feedback signal output pwm signal of DC current, pwm signal feeding inverse excitation type converter carries out copped wave, finally defeated to LED
Go out continuous current；
Described single-chip microcomputer detection circuit includes single chip machine controlling circuit and the voltage detecting being connected with single chip machine controlling circuit electricity
Road, current detection circuit and temperature sensing circuit, the external LCD display of single-chip microcomputer.
Described single chip machine controlling circuit includes single-chip microcomputer U7, crystal oscillator, reset circuit and JTAG download interfaces.
Described voltage detecting circuit includes the voltage detecting potential-divider network being made up of resistance R24, R25, R27, R39, point
Pressure network network will be defeated AD conversion input port PA1, single-chip microcomputer U7 that single-chip microcomputer U7 is sent into after the output voltage partial pressure of drive circuit
Go out photovoltaic conversion to be handled for digital quantity；AD conversion input port PA1 the first clamp circuits of connection avoid voltage overshoot, first
Clamp circuit is made up of diode D12, D14.
Described current detection circuit includes current amplification circuit and current sampling resistor R15；Current amplification circuit is by transporting
Calculate amplifier U1；Peripheral resistance R3, R4, R9 and R11；Electric capacity C2, C3 and C11 are constituted；The output current warp of the drive circuit
Current sampling resistor R15 switchs to voltage signal, after feeding current amplification circuit amplification, the RC filter circuits constituted through R51, C34
After filtering, feeding single-chip microcomputer U7 AD conversion input port PA2 is converted into digital quantity processing, PA2 ports connection the second clamp electricity
Road, the second clamp circuit is made up of diode D11, D13.
Described temperature sensing circuit includes thermistor R40, resistance R31 and electric capacity C19；With temperature change, R40 and
The magnitude of voltage that R31 constitutes temperature detection potential-divider network changes, magnitude of voltage feeding single-chip microcomputer U7 AD conversion input port
PA0, is converted into digital quantity processing.
Described single-chip microcomputer model ATmegal16L, single-chip microcomputer is configured with Asynchronous Serial Interface.
Beneficial effects of the present invention：
1. the drive circuit of the present invention uses voltage, electric current double control ring parallel-connection structure, current and voltage feedback feedback circuit is by transporting
Calculate amplifier U4, C24, R46, C15, R22, D7 to constitute, R45, R44, R43, R47 and voltage-stabiliser tube U5 constitute voltage reference circuit,
Voltage reference is provided to the closed-loop feedback circuit that operational amplifier U4 is constituted.U4B constitutes current feedback circuit, and U4A constitutes voltage
Feedback control loop.The electric current of current sampling resistor R15 sampling LEDs, sends into U4B, U4B outputs are by diode D7 to optocoupler U2 handles
Current error signal sends into PWM controller U13, forms closed-loop current control, and output constant current driven LED is lighted.Resistance
R5, R10 are sent to U4A to being added in after the voltage of LED, then voltage error signal is sent to optocoupler U2 by diode D7
Enter PWM controller U13, form voltage close loop control.LED needs constant current driven during normal work, and now electric current loop is carried out
Closed-loop control so that driver output constant current drives LED steady illumination；When LED string is opened a way, the voltage on LED is added in
It can raise, now Voltage loop is controlled so that be added in the voltage constant pressure on LED, pass through voltage and current feedback control loop
Realize the constant current voltage limiting control of driver.So as to improve constant current, the precision of voltage regulation of controller.
2. the single-chip microcomputer detection circuit of the present invention realizes the real-time monitoring to the voltage, circuit and temperature of LED, right
The development of LED drive power provides reliable data reference.
3. by emulation and experimental verification, device of the invention has good practical value and application prospect.
Brief description of the drawings
Fig. 1 is the circuit diagram of present invention driver circuit；
Fig. 2 is the circuit diagram of single chip machine controlling circuit of the present invention；
Fig. 3 is the circuit diagram of voltage detecting circuit of the present invention；
Fig. 4 is the circuit diagram of current detection circuit of the present invention；
Fig. 5 is the circuit diagram of temperature sensing circuit of the present invention.
Embodiment
The present invention is further detailed below in conjunction with the accompanying drawings, it is electrically special referring to a kind of LED described in Fig. 1-Fig. 5
Property measure and control device, described measure and control device includes the drive circuit and single-chip microcomputer detection circuit being connected respectively with LED；Referring to
Fig. 1, described drive circuit includes antisurge protection module, EMI filtration modules, full-bridge rectification module, inverse excitation type converter mould
Block, output rectification filter module, current and voltage feedback feedback module and PWM controller.85V ~ 265V electric mains pass through first
Enter EMI filtration modules after antisurge protection module, the electromagnetic interference that the module suppresses the generation of rear class power circuit passes through power supply
Line disturbs power network, while preventing the electromagnetic interference of power network from entering late-class circuit through power line；The alternating voltage of EMI outputs enters complete
Bridge rectification circuit is made into direct current feeding inverse excitation type converter and carries out power conversion；It is whole through exporting after the output of high frequency transformer secondary
Flow output current after filtration module；Current and voltage feedback feedback module is output voltage current feedback to PWM controller, the control
Device carries out copped wave, final output constant current according to feedback of voltage and current signal output pwm signal, signal feeding inverse excitation type converter
Electric current driving LED illumination.
Described single-chip microcomputer detection circuit includes single chip machine controlling circuit and the voltage being connected with single chip machine controlling circuit inspection
Slowdown monitoring circuit, current detection circuit and temperature sensing circuit, the external LCD display of single-chip microcomputer, single-chip microcomputer detection circuit mainly pass through
Voltage, electric current and the temperature data of sensor real-time sampling high-powered LED lamp, and voltage, electric current and temperature data is real-time
Display on an lcd display, is intuitively read, to adjust at any time for live.
Described single-chip microcomputer detection circuit includes single chip machine controlling circuit and the voltage being connected with single chip machine controlling circuit inspection
Slowdown monitoring circuit, current detection circuit and temperature sensing circuit, the external LCD display of single-chip microcomputer.
Described single chip machine controlling circuit includes single-chip microcomputer U7, crystal oscillator, reset circuit and JTAG download interfaces.
Described voltage detecting circuit includes the voltage detecting potential-divider network being made up of resistance R24, R25, R27, R39, point
Pressure network network will be defeated AD conversion input port PA1, single-chip microcomputer U7 that single-chip microcomputer U7 is sent into after the output voltage partial pressure of drive circuit
Go out photovoltaic conversion to be handled for digital quantity；To prevent output voltage overshoot from causing Chip Microcomputer A/D port to damage, AD conversion input
Port PA1 the first clamp circuits of connection, the first clamp circuit is made up of diode D12, D14.
Described current detection circuit includes current amplification circuit and current sampling resistor R15；Current amplification circuit is by transporting
Calculate amplifier U1；Peripheral resistance R3, R4, R9 and R11；Electric capacity C2, C3 and C11 are constituted；The output current warp of the drive circuit
Current sampling resistor R15（0.22R/2W）Switch to voltage signal（Due to R15 resistance very littles, its voltage dividing ability can be neglected）,
Send into after current amplification circuit amplification, after the RC filter circuits filtering that R51, C34 are constituted, feeding single-chip microcomputer U7 AD conversion is defeated
Inbound port PA2, be converted into digital quantity processing, PA2 ports connect the second clamp circuit, the second clamp circuit by diode D11,
D13 is constituted.
Described temperature sensing circuit includes thermistor R40, resistance R31 and electric capacity C19；With temperature change, R40 and
The magnitude of voltage that R31 constitutes temperature detection potential-divider network changes, magnitude of voltage feeding single-chip microcomputer U7 AD conversion input port
PA0, is converted into digital quantity processing.
Described single-chip microcomputer model can select the other models of ATmegal16L or functionally similar, and single-chip microcomputer is to LED
The real-time monitoring of voltage, circuit and temperature.Single-chip microcomputer is configured with Asynchronous Serial Interface, can be LED voltage, the electricity detected
Stream and temperature signal feeding computer are handled, and can also be supplied the display in real time of voltage, electric current and temperature data on the lcd screen
Live reading directly perceived, to adjust at any time.
The present invention is powered using inverse-excitation type switch power-supply for great power LED, it is contemplated that the line voltage of various countries is not quite similar,
And requirement of the various countries to the safety standard of electrical equipment is different, design employs Width funtion（85V~265V）Input.LED is electric
The characteristics of characteristic measure and control device is and is directed to LED develops a series of constant pressure and flows control electronic circuits, by constant current driver circuit for LED and
Single-chip microcomputer detection circuit two parts are constituted, and are controlled LED input current in optimum amounts of current using integrated circuit technique so that
LED can obtain stable electric current, and produce highest output light flux.Meanwhile, single-chip microcomputer detection circuit can be realized to LED
In real time monitoring, so as to LED drive circuit in the case where the factor such as input voltage and environment temperature changes in the best way
Control the size of LED current.
Claims (6)
- The measure and control device of 1.LED lamp electrical characteristics, it is characterised in that：Described measure and control device includes what is be connected respectively with LED Drive circuit and single-chip microcomputer detection circuit；Described drive circuit includes antisurge protection module, EMI filtration modules, full-bridge rectification module, inverse-excitation type and becomes mold changing Block, output rectification filter module, current and voltage feedback feedback module and PWM controller；85V ~ 265V electric main access is anti- Surge protection module, electric current is by entering EMI filtration modules after antisurge protection module；EMI filtration modules suppress following stage Power circuit produces electromagnetic interference and enters utility grid, while preventing the electromagnetic interference of utility grid from entering late-class circuit；EMI is filtered The alternating current of ripple module output is made into after DC current into full bridge rectifier sends into inverse excitation type converter progress power change Change；DC current after inverse excitation type converter power conversion is output to LED string after output rectification filter module；Described electricity The DC current that output rectification filter module is exported is fed back to PWM controller, PWM controller root by current voltage closed loop feedback module According to the feedback signal output pwm signal of DC current, pwm signal feeding inverse excitation type converter carries out copped wave, finally defeated to LED Go out continuous current；Described single-chip microcomputer detection circuit includes single chip machine controlling circuit and the voltage detecting being connected with single chip machine controlling circuit electricity Road, current detection circuit and temperature sensing circuit, the external LCD display of single-chip microcomputer.
- 2. the measure and control device of LED electrical characteristic according to claim 1, it is characterised in that：Described single-chip microcomputer control Circuit includes single-chip microcomputer U7, crystal oscillator, reset circuit and JTAG download interfaces.
- 3. the measure and control device of LED electrical characteristic according to claim 1 or 2, it is characterised in that：Described voltage detecting Circuit includes the voltage detecting potential-divider network being made up of resistance R24, R25, R27, R39, output of the potential-divider network drive circuit Output voltage is converted into digital quantity progress by AD conversion the input port PA1, single-chip microcomputer U7 that single-chip microcomputer U7 is sent into after voltage Processing；AD conversion input port PA1 the first clamp circuits of connection avoid voltage overshoot, the first clamp circuit by diode D12, D14 is constituted.
- 4. the measure and control device of LED electrical characteristic according to claim 3, it is characterised in that：Described current detecting electricity Road includes current amplification circuit and current sampling resistor R15；Current amplification circuit is by operational amplifier U1；Peripheral resistance R3, R4, R9 and R11；Electric capacity C2, C3 and C11 are constituted；The output current of the drive circuit switchs to voltage letter through current sampling resistor R15 Number, after feeding current amplification circuit amplification, after the RC filter circuits filtering that R51, C34 are constituted, feeding single-chip microcomputer U7 AD turns Input port PA2 is changed, digital quantity processing is converted into, PA2 ports connect the second clamp circuit, and the second clamp circuit is by diode D11, D13 are constituted.
- 5. the measure and control device of LED electrical characteristic according to claim 4, it is characterised in that：Described temperature detection electricity Road includes thermistor R40, resistance R31 and electric capacity C19；With temperature change, R40 and R31 constitute temperature detection potential-divider network Magnitude of voltage change, magnitude of voltage feeding single-chip microcomputer U7 AD conversion input port PA0 is converted into digital quantity processing.
- 6. the measure and control device of LED electrical characteristic according to claim 5, it is characterised in that：Described single-chip microcomputer model For ATmegal16L, single-chip microcomputer is configured with Asynchronous Serial Interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710278999.XA CN107041035A (en) | 2017-04-25 | 2017-04-25 | The measure and control device of LED electrical characteristic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710278999.XA CN107041035A (en) | 2017-04-25 | 2017-04-25 | The measure and control device of LED electrical characteristic |
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| CN107041035A true CN107041035A (en) | 2017-08-11 |
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| CN201710278999.XA Pending CN107041035A (en) | 2017-04-25 | 2017-04-25 | The measure and control device of LED electrical characteristic |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107318197A (en) * | 2017-08-17 | 2017-11-03 | 无锡市益明光电有限公司 | A kind of LED multi-path current balance circuit |
| CN110881232A (en) * | 2019-12-17 | 2020-03-13 | 深圳市太美亚电子科技有限公司 | Flyback switching power supply circuit |
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Patent Citations (4)
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| CN103428946A (en) * | 2012-05-23 | 2013-12-04 | 张小科 | LED constant current power source circuit |
| CN204497808U (en) * | 2015-04-24 | 2015-07-22 | 马鞍山九天智控科技有限公司 | A kind of multifuctional solar charger baby |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107318197A (en) * | 2017-08-17 | 2017-11-03 | 无锡市益明光电有限公司 | A kind of LED multi-path current balance circuit |
| CN110881232A (en) * | 2019-12-17 | 2020-03-13 | 深圳市太美亚电子科技有限公司 | Flyback switching power supply circuit |
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Application publication date: 20170811 |
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