CN102595700A - Intrinsic safety LED (Light Emitting Diode) driving power source with high power for mines - Google Patents

Intrinsic safety LED (Light Emitting Diode) driving power source with high power for mines Download PDF

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CN102595700A
CN102595700A CN2012100020472A CN201210002047A CN102595700A CN 102595700 A CN102595700 A CN 102595700A CN 2012100020472 A CN2012100020472 A CN 2012100020472A CN 201210002047 A CN201210002047 A CN 201210002047A CN 102595700 A CN102595700 A CN 102595700A
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output
circuit
power source
driving power
voltage
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CN102595700B (en
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于月森
伍小杰
戴鹏
戚文燕
周娟
谢冬莹
张望
李世光
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China University of Mining and Technology CUMT
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China University of Mining and Technology CUMT
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Abstract

The invention relates to an intrinsic safety LED (Light Emitting Diode) driving power source with high power for mines and belongs to a driving power source for LED lamps. The intrinsic safety LED driving power source with high power comprises a high frequency flyback converter, a rectifying circuit, an output filtering circuit, a feedback circuit and a PWM (Pulse Width Modulation) controller, wherein an output end of the high frequency flyback converter is connected with the rectifying circuit; the output end of the rectifying circuit is connected with the output filtering circuit; the output end of the output filtering circuit is a circuit output end and simultaneously is connected with an input end of the feedback circuit; and the feedback circuit is connected with the high frequency flyback converter through the PWM controller. Compared with the prior art, the intrinsic safety LED driving power source has the advantages that the power source is always kept constant under the condition of changing a load or input voltage and output current, and when the short-circuiting happens in the output, the released energy is below the minimum ignition energy value of a gas, thereby the explosion is avoided; and the intrinsic safety LED driving power source has simple structure and long service life, is energy-saving and environment-friendly, is convenient to carry and is suitable for hazardous areas such as coal mines, petrochemical industries and the like.

Description

A kind of mine intrinsic safety high-power LED driving power source
Technical field
The present invention relates to a kind of LED lamp driving power source, especially a kind of mine intrinsic safety high-power LED driving power source.
Background technology
The colliery illumination has higher requirement to the explosion-proof light of light fixture: guarantee good illumination level, also will consider the safety anti-explosive of operational environment simultaneously.Many shortcomings such as mine working still uses incandescent lamp as main light source so far, exists illumination low, and the life-span is short; Illuminator can not satisfy the emergency lighting needs of operation field illumination and burst accident; Many mines use old-fashioned mine lamp, and heaviness is not portable, and the operating time is shorter.Advantages such as and the LED light fixture has long service life, green illumination, light efficiency height, and safe and reliable, economize on electricity is remarkable, so the LED light fixture becomes the better choice of mining illumination.The LED driving power all uses on the ground at present, and power is higher, under coal mine, sets off an explosion easily; Therefore be not suitable for mine; Because the LED driving power is the constant-current type driving, and intrinsic safety electric source all is output as the constant voltage type at present, is not suitable for LED and drives use in addition.
Summary of the invention
The objective of the invention is to provide a kind of mine intrinsic safety high-power LED driving power source, solve present LED driving power and all be to use on the ground and power higher, the problem that under coal mine, sets off an explosion easily.
The present invention is achieved in that the intrinsic safety high-power LED driving power source comprises high frequency anti exciting converter, rectification circuit, output filter circuit, feedback circuit, PWM controller; The output of high frequency anti exciting converter is connected with rectification circuit; The output of rectification circuit is connected with output filter circuit; The output of output filter circuit is a circuit output end, is connected with the input of feedback circuit simultaneously, and feedback circuit is connected with the high frequency anti exciting converter through the PWM controller.
The control method of this driving power and the obtaining value method of device:
Control method: for realizing constant current output, rectification circuit adopts diode to carry out rectification; Transformer has the effect of inductance in the high frequency anti exciting converter, and output filter circuit only adopts electric capacity; Feedback circuit adopt voltage-stabiliser tube cooperate optocoupler as a reference, isolate, sampling, utilize and detect resistance output is fed back to voltage-stabiliser tube, through optocoupler input and output are isolated again, the collector terminal of the built-in triode of optocoupler is received 2 pin of error amplifier; The PWM controller adopts the single-ended output type current-control type of high-performance PWM-type chip error amplifier, compares with the reference voltage of internal amplifier in-phase input end, produces control voltage, and the width of control impuls realizes that output is constant.
The device obtaining value method: maximum output ripple electric current is obtained the design lower limit that minimum obtains inductance:
Figure 2012100020472100002DEST_PATH_IMAGE002
（1）
In the formula:
Figure 2012100020472100002DEST_PATH_IMAGE004
: duty ratio;
Figure 2012100020472100002DEST_PATH_IMAGE006
: maximum input voltage;
Figure 2012100020472100002DEST_PATH_IMAGE008
: minimum load resistance;
Figure 2012100020472100002DEST_PATH_IMAGE010
: frequency;
Figure 2012100020472100002DEST_PATH_IMAGE012
: output current
To satisfy the design lower limit that output ripple electric current index request obtains electric capacity:
Figure 2012100020472100002DEST_PATH_IMAGE014
（2）
In the formula: : minimum input voltage;
Figure 2012100020472100002DEST_PATH_IMAGE018
: maximum output ripple electric current; All the other parameters are the same.
Be
Figure 2012100020472100002DEST_PATH_IMAGE020
if the maximum output short-circuit of essential safety switch converters releases energy, the output short-circuit equivalent capacity
Figure 2012100020472100002DEST_PATH_IMAGE022
that can get converter from the equivalent angle of energy does
If consider safety K (fault; Coefficient of safety is 1.5); The converter that then is
Figure 2012100020472100002DEST_PATH_IMAGE026
for output voltage; Light on the voltage curve in minimum that to check in
Figure 2012100020472100002DEST_PATH_IMAGE028
corresponding electric capacity is
Figure 2012100020472100002DEST_PATH_IMAGE030
, then converter satisfies the criterion of output essential safety and does
Figure 2012100020472100002DEST_PATH_IMAGE032
Therefore to satisfy the design higher limit that the output essential safety requires to obtain electric capacity:
Figure 2012100020472100002DEST_PATH_IMAGE034
（3）
Where:
Figure 2012100020472100002DEST_PATH_IMAGE036
: the minimum ignition voltage curve obtained
Figure 2012100020472100002DEST_PATH_IMAGE038
corresponding capacitance;
Figure 2012100020472100002DEST_PATH_IMAGE040
: Maximum load resistance;
Figure 2012100020472100002DEST_PATH_IMAGE042
: secondary inductance; remaining parameters as above.
Beneficial effect: change load or input voltage output current total energy and keep energy constant and that when output is short-circuited, discharge to light below the energy value, avoided the generation of blast, realized the object of the invention in the gas minimum.
The present invention compared with prior art, simple in structure, energy-conserving and environment-protective, long service life, easy to carry are applicable to hazardous areas such as colliery, petrochemical industry.
Description of drawings
Fig. 1 is a structure chart of the present invention.
Fig. 2 is a main topology diagram of the present invention.
Fig. 3 is a control chip circuit structure diagram of the present invention.
Fig. 4 is a circuit structure diagram of the present invention.
Among Fig. 1, U1, high frequency anti exciting converter; U2, rectification circuit; U3, output filter circuit; U4, feedback circuit; U5, PWM controller.
Embodiment
Below in conjunction with the embodiment in the accompanying drawing the present invention is done further description:
Embodiment 1: the intrinsic safety high-power LED driving power source comprises high frequency anti exciting converter U1, rectification circuit U2, output filter circuit U3, feedback circuit U4, PWM controller U5; The output of high frequency anti exciting converter U1 is connected with rectification circuit U2; The output of rectification circuit U2 is connected with output filter circuit U3, and the output of output filter circuit U3 is a circuit output end, is connected with the input of feedback circuit U4 simultaneously; Feedback circuit U4 connects through PWM controller U5 and, high frequency anti exciting converter U1.
The control method of this driving power and the obtaining value method of device:
Control method: for realizing constant current output, rectification circuit adopts diode to carry out rectification; Transformer has the effect of inductance in the high frequency anti exciting converter, and output filter circuit only adopts electric capacity; Feedback circuit adopt voltage-stabiliser tube TL431 cooperate optocoupler PC817A as a reference, isolate, sampling; Utilize detection resistance that output is fed back to voltage-stabiliser tube; Through optocoupler input and output are isolated, the collector terminal of the built-in triode of optocoupler is received 2 pin of error amplifier UC3842 again; The PWM controller adopts the single-ended output type current-control type of high-performance PWM-type chip error amplifier UC3842, compares with the reference voltage of internal amplifier in-phase input end, produces control voltage, and the width of control impuls realizes that output is constant.
The device obtaining value method: maximum output ripple electric current is obtained the design lower limit that minimum obtains inductance:
Figure 676296DEST_PATH_IMAGE002
（1）
In the formula:
Figure 626060DEST_PATH_IMAGE004
: duty ratio;
Figure 405797DEST_PATH_IMAGE006
: maximum input voltage;
Figure 801007DEST_PATH_IMAGE008
: minimum load resistance; : frequency;
Figure 969000DEST_PATH_IMAGE012
: output current
To satisfy the design lower limit that output ripple electric current index request obtains electric capacity:
Figure 236033DEST_PATH_IMAGE014
（2）
In the formula:
Figure 434933DEST_PATH_IMAGE016
: minimum input voltage;
Figure 103812DEST_PATH_IMAGE018
: maximum output ripple electric current; All the other parameters are the same.
Be
Figure 628334DEST_PATH_IMAGE020
if the maximum output short-circuit of essential safety switch converters releases energy, the output short-circuit equivalent capacity that can get converter from the equivalent angle of energy does
Figure 119675DEST_PATH_IMAGE024
If consider safety K (fault; Coefficient of safety is 1.5); The converter that then is for output voltage; Light on the voltage curve in minimum that to check in corresponding electric capacity is
Figure 845689DEST_PATH_IMAGE030
, then converter satisfies the criterion of output essential safety and does
Figure 120812DEST_PATH_IMAGE032
Therefore to satisfy the design higher limit that the output essential safety requires to obtain electric capacity:
Figure 764283DEST_PATH_IMAGE034
（3）
Where:
Figure 99450DEST_PATH_IMAGE036
: the minimum ignition voltage curve obtained
Figure 359530DEST_PATH_IMAGE038
corresponding capacitance;
Figure 438344DEST_PATH_IMAGE040
: Maximum load resistance;
Figure 936322DEST_PATH_IMAGE042
: secondary inductance; remaining parameters as above.
In Fig. 1: circuit is mainly by high frequency flyback transformer U1, rectification circuit U2, and output filter circuit U3, feedback circuit U4, PWM controller U5 forms.The secondary side of high frequency flyback transformer U1 carries out rectification through a diode, and output filter circuit U3 realizes that through electric capacity feedback circuit U4 is made up of optocoupler PC817A and voltage-stabiliser tube TL431, and the output of circuit is through detecting resistance R 1, divider resistance R 2, R3 and inverting amplifier uA741 feed back to the reference edge R of TL431, TL431 connects with the diode of PC817A, thus output changes and causes the variation that causes PC817A transistor collector voltage through the variation of diode current.The collector electrode of PC817A triode links to each other with 2 pin of UC3842, compares with the reference voltage of internal amplifier in-phase input end, produces control voltage, the width of control impuls, thus realize that output is constant.That PWM controller U5 adopts is the single-ended output type current-control type of high-performance pulse-width modulation cake core UC3842.
In Fig. 2, V i Be input voltage, i 1Be input current , i 0Be output current, K is a power switch pipe, and D is a fly-wheel diode, CBe filter, RBe load, T is a transformer, and primary inductance does L 1, secondary inductance does L 2, i 1For flowing through inductance L 1Electric current, i 2For flowing through inductance L 2Electric current, primary turns does N 1, number of secondary turns does N 2
The positive source that terminates at of the same name of transformer, the different name end links to each other with a contact of K switch, and another contact of K switch is connected on power cathode, and the anode of diode D is connected on different name end, negative electrode and the filter of transformer secondary output coil CAn end link to each other filter CThe other end be connected on the end of the same name of transformer secondary output coil, load R LBe attempted by the filter two ends.
UC3842 has 8 pins.1 pin is the error amplifier output, through a grounding through resistance; 2 pin are pressure feedback ports, and the reference voltage of this pin and internal amplifier in-phase input end compares, and produce control voltage, the width of control impuls; 3 pin are current detecting inputs, primary current through insert one with the source series of switch Q be the sample resistance of reference with ground R SConvert voltage to, this voltage keep watch on by 3 pin and with from the output level of error amplifier relatively. R SAnd 3 connect between the pin R, CThe filter of forming, the current spike that produces when being used to suppress power switch pipe and opening; 4 pin are regularly ends, external timing resistance R TAnd timing capacitor C T, produce the sawtooth waveforms of required frequency; 5 pin are earth terminals; 6 pin are driving pulse outputs, through a resistance driving power switching tube; 7 pin are chip power supply power inputs; 8 pin are reference voltage output ends.
In Fig. 4, D1 is a main circuit, mainly is made up of high frequency anti exciting converter, rectification circuit, output filter circuit; D2 is a feedback circuit, mainly is made up of voltage-stabiliser tube TL431 and optocoupler PC817A; D3 is a control circuit, is made up of PWM controller and auxiliary circuit thereof.
The end of the same name of transformer T1 primary coil links to each other with the positive pole of power supply, and different name terminates on the contact of switch Q, another contact and the sample resistance of Q R sAn end link to each other, R sOther end ground connection.The anode of diode VD1 is connected on different name end, negative electrode and the filter capacitor of transformer secondary output coil C 1An end link to each other electric capacity C 1The other end be connected on the end of the same name of transformer secondary output coil.Load resistance R LOne terminates at the negative electrode of diode VD1, other end ground connection.Current sense resistor R 1One end ground connection, the other end are connected on the end of the same name of transformer secondary output coil.Divider resistance R 2One end with R 1Non-earth terminal link to each other, again with R 3Series connection, R 3Other end ground connection.Pressure feedback port a is connected on the reference edge R of voltage-stabiliser tube TL431 through inverting amplifier uA741.The C end ground connection of TL431, the A end links to each other with 2 ends of optocoupler PC817A, and 1 end passes through resistance R 4And voltage-stabiliser tube ZD is connected on the negative electrode of fly-wheel diode VD1,3 end ground connection, 4 termination powers.Vcc end and the Vc of UC3842 terminate on the power supply; Gnd end and pwgnd end ground connection; The comp end passes through resistance R 6Ground connection; Vfb end with pass through resistance after the Vcc end links to each other R 5Be connected on the Vref end; Resistance R TOne termination Vref end, the other end and electric capacity C TBack ground connection links to each other; Rct terminates at R TWith C TThe junction, rct end passes through electric capacity C 2With R sNon-earth terminal link to each other; Cs end respectively with electric capacity C 3And resistance R 9An end link to each other electric capacity C 3Other end ground connection, R 9The other end be connected on R sNon-earth terminal, output end passes through resistance R gDriving switch Q turn-offs.

Claims (2)

1. mine intrinsic safety high-power LED driving power source; It is characterized in that: the intrinsic safety high-power LED driving power source comprises high frequency anti exciting converter, rectification circuit, output filter circuit, feedback circuit, PWM controller; The output of high frequency anti exciting converter is connected with rectification circuit; The output of rectification circuit is connected with output filter circuit; The output of output filter circuit is a circuit output end, is connected with the input of feedback circuit simultaneously, and feedback circuit is connected with the high frequency anti exciting converter through the PWM controller.
2. a kind of mine intrinsic safety high-power LED driving power source according to claim 1 is characterized in that: the control method of this driving power and the obtaining value method of device:
Control method: for realizing constant current output, rectification circuit adopts diode to carry out rectification; Transformer has the effect of inductance in the high frequency anti exciting converter, and output filter circuit only adopts electric capacity; Feedback circuit adopt voltage-stabiliser tube cooperate optocoupler as a reference, isolate, sampling, utilize and detect resistance output is fed back to voltage-stabiliser tube, through optocoupler input and output are isolated again, the collector terminal of the built-in triode of optocoupler is received 2 pin of error amplifier; The PWM controller adopts the single-ended output type current-control type of high-performance PWM-type chip error amplifier, compares with the reference voltage of internal amplifier in-phase input end, produces control voltage, and the width of control impuls realizes that output is constant;
The device obtaining value method: maximum output ripple electric current is obtained the design lower limit that minimum obtains inductance:
（1）
In the formula: : duty ratio;
Figure 2012100020472100001DEST_PATH_IMAGE006
: maximum input voltage;
Figure 2012100020472100001DEST_PATH_IMAGE008
: minimum load resistance;
Figure 2012100020472100001DEST_PATH_IMAGE010
: frequency;
Figure 2012100020472100001DEST_PATH_IMAGE012
: output current
To satisfy the design lower limit that output ripple electric current index request obtains electric capacity:
Figure 2012100020472100001DEST_PATH_IMAGE014
（2）
In the formula:
Figure 2012100020472100001DEST_PATH_IMAGE016
: minimum input voltage;
Figure 2012100020472100001DEST_PATH_IMAGE018
: maximum output ripple electric current; All the other parameters are the same;
Be
Figure 2012100020472100001DEST_PATH_IMAGE020
if the maximum output short-circuit of essential safety switch converters releases energy, the output short-circuit equivalent capacity
Figure 2012100020472100001DEST_PATH_IMAGE022
that can get converter from the equivalent angle of energy does
Figure 2012100020472100001DEST_PATH_IMAGE024
If consider safety K (fault; Coefficient of safety is 1.5); The converter that then is
Figure 2012100020472100001DEST_PATH_IMAGE026
for output voltage; Light on the voltage curve in minimum that to check in corresponding electric capacity is
Figure 2012100020472100001DEST_PATH_IMAGE030
, then converter satisfies the criterion of output essential safety and does
Figure 2012100020472100001DEST_PATH_IMAGE032
Therefore to satisfy the design higher limit that the output essential safety requires to obtain electric capacity:
Figure 2012100020472100001DEST_PATH_IMAGE034
（3）
Where:
Figure 2012100020472100001DEST_PATH_IMAGE036
: the minimum ignition voltage curve obtained
Figure 2012100020472100001DEST_PATH_IMAGE038
corresponding capacitance;
Figure 2012100020472100001DEST_PATH_IMAGE040
: Maximum load resistance;
Figure 2012100020472100001DEST_PATH_IMAGE042
: secondary inductance; remaining parameters as above.
CN201210002047.2A 2012-01-06 2012-01-06 Intrinsic safety LED (Light Emitting Diode) driving power source with high power for mines Expired - Fee Related CN102595700B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103427621A (en) * 2013-09-02 2013-12-04 东南大学 Mining isolation type intrinsic safety LED driving power source
CN103973124A (en) * 2014-05-15 2014-08-06 广州市特种机电设备检测研究院 Method for designing intrinsic safety type quasi-resonance flyback converter
CN112509299A (en) * 2020-11-11 2021-03-16 广东雅达电子股份有限公司 Wireless temperature device supporting CT power taking of high-voltage power distribution cabinet

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101754537A (en) * 2010-02-02 2010-06-23 大连九久光电制造有限公司 Driving power supply for high-power LED street lamp
CN101801136A (en) * 2010-03-17 2010-08-11 上海大学 High-efficiency LED constant current driving circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101754537A (en) * 2010-02-02 2010-06-23 大连九久光电制造有限公司 Driving power supply for high-power LED street lamp
CN101801136A (en) * 2010-03-17 2010-08-11 上海大学 High-efficiency LED constant current driving circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103427621A (en) * 2013-09-02 2013-12-04 东南大学 Mining isolation type intrinsic safety LED driving power source
CN103427621B (en) * 2013-09-02 2015-09-16 东南大学 A kind of mining isolated intrinsic safety LED drive power
CN103973124A (en) * 2014-05-15 2014-08-06 广州市特种机电设备检测研究院 Method for designing intrinsic safety type quasi-resonance flyback converter
CN103973124B (en) * 2014-05-15 2017-01-18 广州市特种机电设备检测研究院 Method for designing intrinsic safety type quasi-resonance flyback converter
CN112509299A (en) * 2020-11-11 2021-03-16 广东雅达电子股份有限公司 Wireless temperature device supporting CT power taking of high-voltage power distribution cabinet

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