CN104703319B - A kind of detection circuit and lighting apparatus - Google Patents
A kind of detection circuit and lighting apparatus Download PDFInfo
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- CN104703319B CN104703319B CN201310649039.1A CN201310649039A CN104703319B CN 104703319 B CN104703319 B CN 104703319B CN 201310649039 A CN201310649039 A CN 201310649039A CN 104703319 B CN104703319 B CN 104703319B
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Abstract
The embodiment of the invention discloses a kind of detection circuit and lighting apparatus, whether in allowed limits detection circuit is used to detect the electric current of constant-current drive circuit output；Including bleeder circuit, comparison circuit and indicating circuit；The first end of bleeder circuit is connected with the output end of constant-current drive circuit, and the voltage of first end is comparison voltage, bleeder circuit other end ground connection；The first branch and second branch of different colours light are issued when indicating circuit includes conducting；Comparison circuit is connected between the first end of bleeder circuit and indicating circuit, and for providing the first reference voltage and the second reference voltage, when the electric current of constant-current drive circuit output is greater than upper boundary values, comparison voltage is greater than the second reference voltage, first branch conducting；When electric current is less than lower border value, comparison voltage is less than the first reference voltage, second branch conducting.Whether in allowed limits detection circuit provided in an embodiment of the present invention can intuitively judge the electric current of constant-current drive circuit output according to the luminous situation of indicating circuit.
Description
Technical field
The present invention relates to electronic technology field more particularly to a kind of detection circuit and lighting apparatus.
Background technique
The electronic equipment for needing constant-current drive circuit to drive, it is defeated when the output current fluctuation of constant-current drive circuit is larger
When electric current is more than the range allowed out, the normal use of the electronic equipment will affect, in order to detect constant-current drive circuit output
Electric current whether meet the requirements, detection circuit is usually set in circuit, utilize detection circuit detection constant-current drive circuit output
Electric current and will test value and show, judge the electric current of constant-current drive circuit output whether in permission according to the numerical value of display
In range.Whether when being met the requirements using the electric current that this detection circuit judges that constant-current drive circuit exports, judgement is not intuitive enough,
It is unfavorable for user and finds that the electric current of constant-current drive circuit output occurs abnormal and handles in time in time.
Summary of the invention
The embodiment of the present invention the technical problem to be solved is that: a kind of detection circuit is provided, when constant-current drive circuit export
Electric current not in allowed limits when, can intuitively show.
In order to solve the above-mentioned technical problem, the embodiment of the invention provides a kind of detection circuits, for detecting constant current driving
In allowed limits whether the electric current of circuit output, comprising: bleeder circuit, indicating circuit and comparison circuit, wherein
The first end of the bleeder circuit is connected with the output end of the constant-current drive circuit, and the second of the bleeder circuit
End ground connection, the voltage of the bleeder circuit first end are comparison voltage；
The indicating circuit is connected with the output end of the comparison circuit, including issuing the first of different colours light when conducting
Branch and second branch；
The input terminal of the comparison circuit is connected with the first end of the bleeder circuit, the output end of the comparison circuit with
Indicating circuit is connected, and the comparison circuit is for providing the first reference voltage and the second reference voltage, first reference voltage
And second reference voltage respectively with electric current allow range lower border value and upper boundary values it is corresponding；When constant-current drive circuit exports
Electric current when being greater than upper boundary values, the comparison voltage is greater than the second reference voltage, and the first branch of the indicating circuit is connected；
When the electric current of constant-current drive circuit output is less than lower border value, the comparison voltage is less than the first reference voltage, the instruction
The second branch of circuit is connected；When the electric current of constant-current drive circuit output in allowed limits when, the first branch and second
Road is all not turned on.
As an alternative embodiment, the comparison circuit includes: the first comparison circuit and the second comparison circuit,
In,
The first end of first comparison circuit is connected with the first end of the bleeder circuit；First comparison circuit
Second end is connected with the first end of the first end of the first branch and the second branch；
The first end of second comparison circuit is connected with the first end of the bleeder circuit；Second comparison circuit
Second end is connected with the second end of the second end of the first branch and the second branch.
As an alternative embodiment, the bleeder circuit includes: first resistor,
One end of the first resistor is the first end and the output end phase of the constant-current drive circuit of the bleeder circuit
Even, the other end of the first resistor is that the second end of the bleeder circuit is grounded.
As an alternative embodiment, first comparison circuit includes: first comparator and the first reference circuit,
Second comparison circuit includes: the second comparator and the second reference circuit, wherein
The normal phase input end of the first comparator is connected with the first end of the bleeder circuit；The first comparator
Inverting input terminal is connected with the output end of first reference circuit；
First reference circuit, for inputting the first reference voltage to the inverting input terminal of the first comparator；
The inverting input terminal of second comparator is connected with the first end of the bleeder circuit；Second comparator
Normal phase input end is connected with the output end of second reference circuit；
Second reference circuit, for inputting the second reference voltage to the normal phase input end of second comparator.
As an alternative embodiment, first reference circuit, comprising: the first zener diode and the second electricity
Resistance, wherein
The cathode of the plus earth of first zener diode, first zener diode passes through the second resistance
It is connected with power supply, the breakdown reverse voltage of first zener diode is the first reference voltage.
As an alternative embodiment, first reference circuit, comprising: second resistance and the 4th resistance, wherein
The first end of 4th resistance is grounded, and the second end of the 4th resistance passes through the second resistance and power supply phase
Even, the corresponding voltage of the 4th resistance second end is the first reference voltage.
As an alternative embodiment, second reference circuit, comprising: the second zener diode and third electricity
Resistance, wherein
The cathode of the plus earth of second zener diode, second zener diode passes through the 3rd resistor
It is connected with power supply, the breakdown reverse voltage of second zener diode is the second reference voltage.
As an alternative embodiment, second reference circuit, comprising: 3rd resistor and the 5th resistance, wherein
The first end of 5th resistance is grounded, and the second end of the 5th resistance passes through the 3rd resistor and power supply phase
Even, the corresponding voltage of the 5th resistance second end is the second reference voltage.
As an alternative embodiment, the first branch includes the first light emitting diode, the second branch packet
Include the second light emitting diode, wherein
The anode of first light emitting diode is connected with the output end of the first comparator, first light-emitting diodes
The cathode of pipe is connected with the output end of second comparator；
The anode of second light emitting diode is connected with the output end of second comparator, second light-emitting diodes
The cathode of pipe is connected with the output end of the first comparator；
The sending when color of the light issued when first LEDs ON and second LEDs ON
Light color it is different.
Correspondingly, the embodiment of the invention also provides a kind of lighting apparatus, comprising: constant-current drive circuit, with the constant current
The concatenated lighting source of the output end of driving circuit and above-described detection circuit.
Detection circuit provided in an embodiment of the present invention, when the electric current of constant-current drive circuit output is greater than electric current allowed band
The first branch is connected when upper boundary values, when the electric current of constant-current drive circuit output is less than the lower border value of electric current allowed band,
Second branch conducting, when constant-current drive circuit output electric current in allowed limits when, the first branch and second branch are not
Conducting.The color of issued light is different when being connected by the first branch with second branch, so according to first in indicating circuit
Whether in allowed limits the luminous situation of road and second branch can intuitively judge the electric current of constant-current drive circuit.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of modular structure schematic diagram of detection circuit of one embodiment of the invention；
Fig. 2 is a kind of modular structure schematic diagram of detection circuit of further embodiment of this invention；
Fig. 3 is the electrical block diagram of lighting apparatus of the embodiment again comprising detection circuit of the invention；
Fig. 4 is the electrical block diagram of lighting apparatus of the another embodiment of the present invention comprising detection circuit.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is a part of the embodiments of the present invention, instead of all the embodiments.Based on this
Embodiment in invention, every other reality obtained by those of ordinary skill in the art without making creative efforts
Example is applied, shall fall within the protection scope of the present invention.
Whether in allowed limits the embodiment of the present invention can detecte the output electric current of constant-current drive circuit, when beyond fair
Perhaps the difference for the light for when range, being indicated, and being issued according to indicating circuit by the light that indicating circuit issues different colours
Color intuitively judges that the output electric current of constant-current drive circuit is bigger than normal or less than normal.
Referring to Fig. 1, Fig. 1 is a kind of modular structure schematic diagram of detection circuit of one embodiment of the present of invention, the detection
Circuit includes: bleeder circuit, indicating circuit and comparison circuit, wherein the first end of bleeder circuit and constant-current drive circuit it is defeated
Outlet is connected, and the second end ground connection of bleeder circuit, the voltage of bleeder circuit first end is comparison voltage；Indicating circuit is electric compared with
The output end on road is connected, the first branch and second branch including issuing different colours light when conducting；The input of comparison circuit with
The first end of bleeder circuit is connected, and the output end of comparison circuit is connected with indicating circuit, and comparison circuit is for providing the first benchmark
Voltage and the second reference voltage, the first reference voltage and the second reference voltage respectively with electric current allow range lower border value and
Upper boundary values are corresponding；When the electric current of constant-current drive circuit output is greater than upper boundary values, comparison voltage is greater than the second reference voltage,
The first branch of indicating circuit is connected；When the electric current of constant-current drive circuit output is less than lower border value, comparison voltage is less than the
One reference voltage, the second branch conducting of indicating circuit；When the electric current of constant-current drive circuit output in allowed limits when, the
One branch and second branch are all not turned on.
Detection circuit provided in an embodiment of the present invention, when the electric current of constant-current drive circuit output is greater than electric current allowed band
The first branch is connected when upper boundary values, when the electric current of constant-current drive circuit output is less than the lower border value of electric current allowed band,
Second branch conducting, when constant-current drive circuit output electric current in allowed limits when, the first branch and second branch are not
Conducting.The color of issued light is different when being connected by the first branch with second branch, so according to first in indicating circuit
Whether in allowed limits the luminous situation of road and second branch can intuitively judge the electric current of constant-current drive circuit.
Referring to Fig. 2, being a kind of modular structure schematic diagram of detection circuit of further embodiment of this invention, the detection circuit packet
It includes: bleeder circuit, indicating circuit and comparison circuit, wherein the output end phase of the first end of bleeder circuit and constant-current drive circuit
Even, the second end ground connection of bleeder circuit, the voltage of bleeder circuit first end are comparison voltage；Indicating circuit and comparison circuit it is defeated
Outlet is connected, the first branch and second branch including issuing different colours light when conducting；Comparison circuit includes that the first comparison is electric
Road and the second comparison circuit, wherein the first end of the first comparison circuit is connected with the first end of bleeder circuit；First comparison circuit
Second end be connected with the first end of the first end of the first branch and second branch；The first end of second comparison circuit with described point
The first end of volt circuit is connected；The second end phase of the second end of second comparison circuit and the second end of the first branch and second branch
Even.
Detection circuit provided in an embodiment of the present invention, when the electric current of constant-current drive circuit output is greater than electric current allowed band
The first branch is connected when upper boundary values, when the electric current of constant-current drive circuit output is less than the lower border value of electric current allowed band,
Second branch conducting, when constant-current drive circuit output electric current in allowed limits when, the first branch and second branch are not
Conducting.The color of issued light is different when being connected by the first branch with second branch, so according to first in indicating circuit
Whether in allowed limits the luminous situation of road and second branch can intuitively judge the electric current of constant-current drive circuit.
Referring to Fig. 3, being the electrical block diagram of lighting apparatus of the yet another embodiment of the invention comprising detection circuit, packet
It includes: constant-current drive circuit, the concatenated lighting source 1 of output end and detection circuit with constant-current drive circuit.Wherein illumination light
Source 1 includes the third Light-emitting diode LED 3 and the 4th Light-emitting diode LED 4 being connected in series.
Wherein, whether in allowed limits detection circuit is used to detect the electric current of constant-current drive circuit output, comprising: point
Volt circuit 2, indicating circuit 4 and comparison circuit 3.
Wherein, bleeder circuit 2 includes first resistor R1, and the first end of first resistor R1 drives through lighting source 1 and constant current
The output end of circuit is connected, the other end ground connection of first resistor R1.The voltage VIN of the first end of first resistor R1 is more electric
Pressure.
Assuming that the normal range (NR) of the electric current of constant-current drive circuit output is (i1, i2), i1 is lower border value, and i2 is coboundary
Value, the current value of constant-current drive circuit reality output are i, then comparison voltage VIN=i*R1, the first reference voltage value VL=i1*
R1, the second reference voltage VH=i2*R1.
Comparison circuit 3 includes the first comparison circuit 31 and the second comparison circuit 32, wherein the first comparison circuit 31 includes:
First comparator U1 and the first reference circuit 311, the first reference circuit 311 are used for the inverting input terminal 51 to first comparator U1
Input the first reference voltage VL.First reference circuit 311 includes the first zener diode ZD1 and second resistance R2, the first pressure stabilizing
The cathode of the plus earth of diode ZD1, the first zener diode ZD1 is connected by second resistance R2 with power supply VCC, VCC high
In the pressure stabilizing value of the first zener diode ZD1, the first zener diode ZD1 is reversed breakdown pressure stabilizing, and the pressure stabilizing value of ZD1 is equal to the
One reference voltage VL.The reverse input end 51 of first comparator U1 is connected with the cathode of the first zener diode ZD1, and first compares
The normal phase input end 52 of device U1 is connected by the 6th resistance R6 with the first end of first resistor R1, and the power supply of first comparator U1 draws
Foot 55 is connected with power supply VCC, and the grounding pin 54 of first comparator U1 is grounded.
Second comparison circuit 32 includes: the second comparator U2 and the second reference circuit 321, and the second reference circuit 321 is used for
The second reference voltage VH is inputted to the normal phase input end 62 of the second comparator U2.Second reference circuit 321 includes the second pressure stabilizing two
Pole pipe ZD2 and 3rd resistor R3, the plus earth of the second zener diode ZD2, the cathode of the second zener diode ZD2 pass through the
Three resistance R3 are connected with power supply VCC, and VCC is higher than the pressure stabilizing value of the second zener diode ZD2, and the second zener diode ZD2 is anti-
To breakdown pressure stabilizing, the pressure stabilizing value of ZD2 is equal to the second reference voltage VH.The reverse input end 61 of second comparator U2 is compared with first
The normal phase input end 52 of device U1 is connected, the cathode phase of the normal phase input end 62 of the second comparator U2 and the second zener diode ZD2
Even, the power pins 65 of the second comparator U2 are connected with power supply VCC, and the grounding pin 64 of the second comparator U2 is grounded.
Indicating circuit 4 includes the first Light-emitting diode LED 1 and the second Light-emitting diode LED 2 being connected in parallel, wherein the
The anode of one Light-emitting diode LED 1 is connected with the cathode of the second Light-emitting diode LED 2, the cathode of the first Light-emitting diode LED 2
It is connected with the anode of the second Light-emitting diode LED 2.The output end 53 of first comparator U1 is shone by the 7th resistance R7 and first
The anode of diode (LED) 1 is connected, and the output end 63 of the second comparator is connected by the 8th resistance R8 with indicating circuit 4.
Assuming that issuing red light when the first Light-emitting diode LED 1 is connected, the second Light-emitting diode LED 2 issues when being connected
The light of green.
When circuit works normally, i.e., when the output current value i of constant-current drive circuit is between (i1, i2), VL < VIN <
The output voltage values of VH, the output voltage of first comparator U1 and the second comparator U2 are identical, 1 He of the first Light-emitting diode LED
Second Light-emitting diode LED 2 is all not turned on, i.e. the first Light-emitting diode LED 1 and the second Light-emitting diode LED 2 do not shine.
As current value i < i1 of constant-current drive circuit output, VIN < VL, then the output voltage of first comparator U1 is less than
The voltage of second comparator U2 output, then the first Light-emitting diode LED 1 is ended, the conducting of the second Light-emitting diode LED 2, the second hair
Optical diode LED2 issues the light of green.
As current value i > i2 of constant-current drive circuit output, VIN > VH, then the output voltage of first comparator U1 is greater than
The voltage of second comparator U2 output, then the first Light-emitting diode LED 1 is connected, the cut-off of the second Light-emitting diode LED 2, the first hair
Optical diode LED1 issues red light.
Therefore, whether sent out by the first Light-Emitting Diode LED1 in observation detection circuit and the second Light-emitting diode LED 2
Light, and hair what color light, so that it may and on the spot, intuitively know constant-current drive circuit output current value whether
In the range of permission, and when not in allowed limits, the current value of constant-current drive circuit output is less than lower limit value also
It is above upper limit value.
It should be noted that when pressure stabilizing value is just equal to the zener diode of the first reference voltage or the second reference voltage
When can not find, the first reference circuit 311 can also be realized using bleeder circuit, as shown in figure 4, the first reference circuit 311 wraps
Second resistance R2 and the 4th resistance R4 is included, the second end of the first end ground connection of the 4th resistance R4, the 4th resistance R4 passes through the second electricity
Resistance R2 is connected with power supply VCC, and the corresponding voltage of second end of the 4th resistance R4 is the first reference voltage VL, then the 4th resistance R4 is selected
The resistance value is taken to beResistance.Similarly, the second reference circuit 321 can also be realized using bleeder circuit, such as be schemed
Shown in 4, the second reference circuit 321 includes 3rd resistor R3 and the 5th resistance R5, and the first end of the 5th resistance R5 is grounded, the 5th electricity
The second end of resistance R5 is connected by 3rd resistor R3 with power supply VCC, and the corresponding voltage of second end of the 5th resistance R5 is the second base
Quasi- voltage VH, then the 5th resistance R4 choose resistance value be
Embodiments described above is only schematical, does not constitute the restriction to the technical solution protection scope.
Any modifications, equivalent substitutions and improvements made within the spirit and principles of the above embodiments etc., should be included in the skill
Within the protection scope of art scheme.
Claims (4)
1. a kind of detection circuit, for whether in allowed limits to detect the electric current of constant-current drive circuit output, feature exists
In, comprising: bleeder circuit, indicating circuit and comparison circuit, wherein
The first end of the bleeder circuit is connected with the output end of the constant-current drive circuit, the second termination of the bleeder circuit
Ground, the voltage of the bleeder circuit first end are comparison voltage；
The indicating circuit is connected with the output end of the comparison circuit, the first branch including issuing different colours light when conducting
And second branch；
The input terminal of the comparison circuit is connected with the first end of the bleeder circuit, the output end of the comparison circuit and instruction
Circuit is connected, and the comparison circuit is for providing the first reference voltage and the second reference voltage, first reference voltage and the
Two reference voltages are corresponding with the lower border value for the range that electric current allows and upper boundary values respectively；When the electricity of constant-current drive circuit output
When stream is greater than upper boundary values, the comparison voltage is greater than the second reference voltage, and the first branch of the indicating circuit is connected；Work as perseverance
When flowing the electric current of driving circuit output less than lower border value, the comparison voltage is less than the first reference voltage, the indicating circuit
Second branch conducting；When constant-current drive circuit output electric current in allowed limits when, the first branch and second branch are all
It is not turned on；
The comparison circuit includes the first comparison circuit and the second comparison circuit, and first comparison circuit includes: first to compare
Device and the first reference circuit, first reference circuit are used to input the first benchmark electricity to the inverting input terminal of first comparator
Pressure；First reference circuit include the first zener diode and second resistance, the plus earth of first zener diode,
The cathode of first zener diode is connected by the second resistance with the first power supply, and the voltage of first power supply is higher than
The pressure stabilizing value of first zener diode, first zener diode are reversed breakdown pressure stabilizing, first zener diode
Pressure stabilizing value is equal to first reference voltage；The reverse input end of the first comparator is negative with first zener diode
Extremely it is connected, the normal phase input end of the first comparator is connected by the 6th resistance with the first end of first resistor, and described first
The power pins of comparator are connected with first power supply, the grounding pin ground connection of the first comparator；
Second comparison circuit includes: the second comparator and the second reference circuit, and second reference circuit is used for described
The normal phase input end of second comparator inputs the second reference voltage；Second reference circuit includes the second zener diode and third electricity
The cathode of resistance, the plus earth of second zener diode, the second zener diode passes through 3rd resistor and second source phase
Even, the voltage of the second source is higher than the pressure stabilizing value of the second zener diode, and second zener diode is reversed breakdown
The pressure stabilizing value of pressure stabilizing, second zener diode is equal to second reference voltage；The reversed input of second comparator
End is connected with the normal phase input end of the first comparator, the normal phase input end of second comparator and second pressure stabilizing two
The cathode of pole pipe is connected, and the power pins of the second comparator are connected with the second source, the grounding lead of second comparator
Foot ground connection；
Where it is assumed that the normal range (NR) of the electric current of constant-current drive circuit output is (i1, i2), i1 is lower border value, and i2 is top
Dividing value, the current value of constant-current drive circuit reality output are i, then comparison voltage VIN=i*R1, the first reference voltage value VL=
I1*R1, the second reference voltage VH=i2*R1, R1 is the resistance value of the first resistor.
2. detection circuit according to claim 1, which is characterized in that the bleeder circuit includes: first resistor,
One end of the first resistor is that the first end of the bleeder circuit is connected with the output end of the constant-current drive circuit, institute
The other end for stating first resistor is the second end ground connection of the bleeder circuit.
3. detection circuit according to any one of claims 1 or 2, which is characterized in that the first branch includes first
Light emitting diode, the second branch include the second light emitting diode, wherein
The anode of first light emitting diode is connected with the output end of the first comparator, first light emitting diode
Cathode is connected with the output end of second comparator；
The anode of second light emitting diode is connected with the output end of second comparator, second light emitting diode
Cathode is connected with the output end of the first comparator；
The light issued when the color of the light issued when first LEDs ON and second LEDs ON
Color it is different.
4. a kind of lighting apparatus characterized by comprising constant-current drive circuit, the output end string with the constant-current drive circuit
Detection circuit described in the lighting source and claim 1-3 any one of connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310649039.1A CN104703319B (en) | 2013-12-04 | 2013-12-04 | A kind of detection circuit and lighting apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310649039.1A CN104703319B (en) | 2013-12-04 | 2013-12-04 | A kind of detection circuit and lighting apparatus |
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| CN104703319A CN104703319A (en) | 2015-06-10 |
| CN104703319B true CN104703319B (en) | 2019-02-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105188222B (en) * | 2015-09-18 | 2018-07-31 | 歌尔智能科技有限公司 | A kind of ON-OFF control circuit |
| CN107359653A (en) * | 2016-08-12 | 2017-11-17 | 海洋王（东莞）照明科技有限公司 | Adaptive charging circuit |
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| KR20020033342A (en) * | 2000-10-30 | 2002-05-06 | 김영범 | Equalizing device that can check abnormality of car |
| CN1712268A (en) * | 2004-06-25 | 2005-12-28 | 丰田自动车株式会社 | Power supply apparatus capable of detecting abnormality in current flowing in drive circuit |
| CN1786922A (en) * | 2004-12-11 | 2006-06-14 | 鸿富锦精密工业（深圳）有限公司 | Driving circuit for status display lamp of computer |
| CN1862275A (en) * | 2005-04-13 | 2006-11-15 | 通用汽车环球科技运作公司 | Led turn signal and error detecting method |
| CN101005207A (en) * | 2007-01-05 | 2007-07-25 | 华中科技大学 | Output voltage state indicator for power source chip |
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|---|---|---|---|---|
| KR20020033342A (en) * | 2000-10-30 | 2002-05-06 | 김영범 | Equalizing device that can check abnormality of car |
| CN1712268A (en) * | 2004-06-25 | 2005-12-28 | 丰田自动车株式会社 | Power supply apparatus capable of detecting abnormality in current flowing in drive circuit |
| CN1786922A (en) * | 2004-12-11 | 2006-06-14 | 鸿富锦精密工业（深圳）有限公司 | Driving circuit for status display lamp of computer |
| CN1862275A (en) * | 2005-04-13 | 2006-11-15 | 通用汽车环球科技运作公司 | Led turn signal and error detecting method |
| CN101005207A (en) * | 2007-01-05 | 2007-07-25 | 华中科技大学 | Output voltage state indicator for power source chip |
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