CN104703319A - Detection circuit and lighting equipment - Google Patents
Detection circuit and lighting equipment Download PDFInfo
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- CN104703319A CN104703319A CN201310649039.1A CN201310649039A CN104703319A CN 104703319 A CN104703319 A CN 104703319A CN 201310649039 A CN201310649039 A CN 201310649039A CN 104703319 A CN104703319 A CN 104703319A
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Abstract
The embodiment of the invention discloses a detection circuit and a piece of lighting equipment. The detection circuit is used for detecting whether the current output by a constant current drive circuit is within an allowable range. The detection circuit comprises a voltage division circuit, a comparison circuit, and an indication circuit. A first end of the voltage division circuit is connected with the output end of the constant current drive circuit, the voltage of the first end is a comparison voltage, and the other end of the voltage division circuit is grounded. The indication circuit comprises a first branch and a second branch which emit light of different colors when switched on. The comparison circuit is connected between the first end of the voltage division circuit and the indication circuit, and is used for providing a first reference voltage and a second reference voltage. When the current output by the constant current drive circuit is greater than an upper boundary value and the comparison voltage is greater than the second reference voltage, the first branch is switched on; and when the current is smaller than a lower boundary value and the comparison voltage is smaller than the first reference voltage, the second branch is switched on. By adopting the detection circuit provided by the embodiment of the invention, whether the current output by the constant current drive circuit is within the allowable range can be visually judged according to the light emission of the indication circuit.
Description
Technical field
The present invention relates to electronic technology field, particularly relate to a kind of testing circuit and lighting apparatus.
Background technology
The electronic equipment needing constant-current drive circuit to drive, when the output current fluctuation of constant-current drive circuit is larger, when output current exceedes the scope of permission, the normal use of described electronic equipment can be affected, whether the electric current exported to detect constant-current drive circuit meets the requirements, usually testing circuit is set in circuit, detected value also shows by electric current that constant-current drive circuit exports to utilize testing circuit to detect, and judges whether in allowed limits electric current that constant-current drive circuit exports according to the numerical value of display.When using this testing circuit to judge whether the electric current that constant-current drive circuit exports meets the requirements, judge directly perceived not, be unfavorable for that the electric current that user's Timeliness coverage constant-current drive circuit exports occurs abnormal and processes in time.
Summary of the invention
Embodiment of the present invention technical problem to be solved is: provide a kind of testing circuit, when constant-current drive circuit export electric current not in allowed limits time, can show intuitively.
In order to solve the problems of the technologies described above, embodiments provide a kind of testing circuit, for whether in allowed limits detecting the electric current of constant-current drive circuit output, comprise: bleeder circuit, indicating circuit and comparison circuit, wherein,
The first end of described bleeder circuit is connected with the output of described constant-current drive circuit, the second end ground connection of described bleeder circuit, and the voltage of described bleeder circuit first end is comparative voltage;
Described indicating circuit is connected with the output of described comparison circuit, sends the first branch road and second branch road of different colours light when comprising conducting;
The input of described comparison circuit is connected with the first end of described bleeder circuit, the output of described comparison circuit is connected with indicating circuit, described comparison circuit is used for providing the first reference voltage and the second reference voltage, and described first reference voltage and the second reference voltage are corresponding with the lower border value of the scope that electric current allows and upper boundary values respectively; When the electric current that constant-current drive circuit exports is greater than upper boundary values, described comparative voltage is greater than the second reference voltage, the first branch road conducting of described indicating circuit; When the electric current that constant-current drive circuit exports is less than lower border value, described comparative voltage is less than the first reference voltage, the second branch road conducting of described indicating circuit; When constant-current drive circuit export electric current in allowed limits time, the first branch road and second branch road not conductings.
As the optional execution mode of one, described comparison circuit comprises: the first comparison circuit and the second comparison circuit, wherein,
The first end of described first comparison circuit is connected with the first end of described bleeder circuit; Second end of described first comparison circuit is connected with the first end of the first end of described first branch road and described second branch road;
The first end of described second comparison circuit is connected with the first end of described bleeder circuit; Second end of described second comparison circuit is connected with the second end of the second end of described first branch road and described second branch road.
As the optional execution mode of one, described bleeder circuit comprises: the first resistance,
One end of described first resistance is that the first end of described bleeder circuit is connected with the output of described constant-current drive circuit, and the other end of described first resistance is the second end ground connection of described bleeder circuit.
As the optional execution mode of one, described first comparison circuit comprises: the first comparator and the first reference circuit, and described second comparison circuit comprises: the second comparator and the second reference circuit, wherein,
The normal phase input end of described first comparator is connected with the first end of described bleeder circuit; The inverting input of described first comparator is connected with the output of described first reference circuit;
Described first reference circuit, for inputting the first reference voltage to the inverting input of described first comparator;
The inverting input of described second comparator is connected with the first end of described bleeder circuit; The normal phase input end of described second comparator is connected with the output of described second reference circuit;
Described second reference circuit, for inputting the second reference voltage to the normal phase input end of described second comparator.
As the optional execution mode of one, described first reference circuit, comprising: the first voltage stabilizing didoe and the second resistance, wherein,
The plus earth of described first voltage stabilizing didoe, the negative pole of described first voltage stabilizing didoe is connected with power supply by described second resistance, and the reverse breakdown voltage of described first voltage stabilizing didoe is the first reference voltage.
As the optional execution mode of one, described first reference circuit, comprising: the second resistance and the 4th resistance, wherein,
The first end ground connection of described 4th resistance, the second end of described 4th resistance is connected with power supply by described second resistance, and the voltage that described 4th resistance second end is corresponding is the first reference voltage.
As the optional execution mode of one, described second reference circuit, comprising: the second voltage stabilizing didoe and the 3rd resistance, wherein,
The plus earth of described second voltage stabilizing didoe, the negative pole of described second voltage stabilizing didoe is connected with power supply by described 3rd resistance, and the reverse breakdown voltage of described second voltage stabilizing didoe is the second reference voltage.
As the optional execution mode of one, described second reference circuit, comprising: the 3rd resistance and the 5th resistance, wherein,
The first end ground connection of described 5th resistance, the second end of described 5th resistance is connected with power supply by described 3rd resistance, and the voltage that described 5th resistance second end is corresponding is the second reference voltage.
As the optional execution mode of one, described first branch road comprises the first light-emitting diode, and described second branch road comprises the second light-emitting diode, wherein,
The positive pole of described first light-emitting diode is connected with the output of described first comparator, and the negative pole of described first light-emitting diode is connected with the output of described second comparator;
The positive pole of described second light-emitting diode is connected with the output of described second comparator, and the negative pole of described second light-emitting diode is connected with the output of described first comparator;
The color of the light sent during described first LEDs ON is different from the color of the light sent during described second LEDs ON.
Correspondingly, the embodiment of the present invention additionally provides a kind of lighting apparatus, comprising: constant-current drive circuit, the lighting source of connecting with the output of described constant-current drive circuit and above-described testing circuit.
The testing circuit that the embodiment of the present invention provides, the first branch road conducting when the electric current that constant-current drive circuit exports is greater than the upper boundary values of electric current allowed band, when the electric current that constant-current drive circuit exports is less than the lower border value of electric current allowed band, second branch road conducting, when constant-current drive circuit export electric current in allowed limits time, the first branch road and second branch road not conductings.Due to when the first branch road and the second branch road conducting to send the color of light different, so according to the luminous situation of the first branch road in indicating circuit and the second branch road, whether in allowed limits can judge the electric current of constant-current drive circuit intuitively.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the modular structure schematic diagram of a kind of testing circuit of one embodiment of the invention;
Fig. 2 is the modular structure schematic diagram of a kind of testing circuit of further embodiment of this invention;
Fig. 3 be the present invention again embodiment comprise the electrical block diagram of the lighting apparatus of testing circuit;
Fig. 4 is the electrical block diagram that another embodiment of the present invention comprises the lighting apparatus of testing circuit.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Whether in allowed limits the embodiment of the present invention can detect the output current of constant-current drive circuit, when exceeding allowed band, the light being sent different colours by indicating circuit is indicated, and the different colours of the light that can send according to indicating circuit judges that the output current of constant-current drive circuit is bigger than normal or less than normal intuitively.
Refer to Fig. 1, Fig. 1 is the modular structure schematic diagram of a kind of testing circuit of one embodiment of the present of invention, this testing circuit comprises: bleeder circuit, indicating circuit and comparison circuit, wherein, the first end of bleeder circuit is connected with the output of constant-current drive circuit, second end ground connection of bleeder circuit, the voltage of bleeder circuit first end is comparative voltage; Indicating circuit is connected with the output of comparison circuit, sends the first branch road and second branch road of different colours light when comprising conducting; The input of comparison circuit is connected with the first end of bleeder circuit, the output of comparison circuit is connected with indicating circuit, comparison circuit is used for providing the first reference voltage and the second reference voltage, and the first reference voltage and the second reference voltage are corresponding with the lower border value of the scope that electric current allows and upper boundary values respectively; When the electric current that constant-current drive circuit exports is greater than upper boundary values, comparative voltage is greater than the first reference voltage, the first branch road conducting of indicating circuit; When the electric current that constant-current drive circuit exports is less than lower border value, comparative voltage is less than the second reference voltage, the second branch road conducting of indicating circuit; When constant-current drive circuit export electric current in allowed limits time, the first branch road and second branch road not conductings.
The testing circuit that the embodiment of the present invention provides, the first branch road conducting when the electric current that constant-current drive circuit exports is greater than the upper boundary values of electric current allowed band, when the electric current that constant-current drive circuit exports is less than the lower border value of electric current allowed band, second branch road conducting, when constant-current drive circuit export electric current in allowed limits time, the first branch road and second branch road not conductings.Due to when the first branch road and the second branch road conducting to send the color of light different, so according to the luminous situation of the first branch road in indicating circuit and the second branch road, whether in allowed limits can judge the electric current of constant-current drive circuit intuitively.
Refer to Fig. 2, it is the modular structure schematic diagram of a kind of testing circuit of further embodiment of this invention, this testing circuit comprises: bleeder circuit, indicating circuit and comparison circuit, wherein, the first end of bleeder circuit is connected with the output of constant-current drive circuit, second end ground connection of bleeder circuit, the voltage of bleeder circuit first end is comparative voltage; Indicating circuit is connected with the output of comparison circuit, sends the first branch road and second branch road of different colours light when comprising conducting; Comparison circuit comprises the first comparison circuit and the second comparison circuit, and wherein, the first end of the first comparison circuit is connected with the first end of bleeder circuit; Second end of the first comparison circuit is connected with the first end of the first end of the first branch road and the second branch road; The first end of the second comparison circuit is connected with the first end of described bleeder circuit; Second end of the second comparison circuit is connected with the second end of the second end of the first branch road and the second branch road.
The testing circuit that the embodiment of the present invention provides, the first branch road conducting when the electric current that constant-current drive circuit exports is greater than the upper boundary values of electric current allowed band, when the electric current that constant-current drive circuit exports is less than the lower border value of electric current allowed band, second branch road conducting, when constant-current drive circuit export electric current in allowed limits time, the first branch road and second branch road not conductings.Due to when the first branch road and the second branch road conducting to send the color of light different, so according to the luminous situation of the first branch road in indicating circuit and the second branch road, whether in allowed limits can judge the electric current of constant-current drive circuit intuitively.
Refer to Fig. 3, be the electrical block diagram that yet another embodiment of the invention comprises the lighting apparatus of testing circuit, comprise: constant-current drive circuit, the lighting source 1 of connecting with the output of constant-current drive circuit and testing circuit.Wherein lighting source 1 comprises the 3rd LED 3 and the 4th LED 4 that are connected in series.
Wherein, testing circuit, for whether in allowed limits detecting the electric current of constant-current drive circuit output, comprising: bleeder circuit 2, indicating circuit 4 and comparison circuit 3.
Wherein, bleeder circuit 2 comprises the first resistance R1, and the first end of the first resistance R1 is connected with the output of constant-current drive circuit through lighting source 1, the other end ground connection of the first resistance R1.The voltage VIN of the first end of the first resistance R1 is comparative voltage.
The normal range (NR) supposing the electric current that constant-current drive circuit exports is (i1, i2), and i1 is lower border value, i2 is upper boundary values, and the current value of the actual output of constant-current drive circuit is i, then comparative voltage VIN=i*R1, first reference voltage value VL=i1*R1, the second reference voltage V H=i2*R1.
Comparison circuit 3 comprises the first comparison circuit 31 and the second comparison circuit 32, wherein, first comparison circuit 31 comprises: the first comparator U1 and the first reference circuit 311, first reference circuit 311 are for inputting the first reference voltage V L to the inverting input 51 of the first comparator U1.First reference circuit 311 comprises the first voltage stabilizing didoe ZD1 and the second resistance R2, the plus earth of the first voltage stabilizing didoe ZD1, the negative pole of the first voltage stabilizing didoe ZD1 is connected with power supply VCC by the second resistance R2, VCC is higher than the voltage stabilizing value of the first voltage stabilizing didoe ZD1, first voltage stabilizing didoe ZD1 is reversed and punctures voltage stabilizing, and the voltage stabilizing value of ZD1 equals the first reference voltage V L.The reverse input end 51 of the first comparator U1 is connected with the negative pole of the first voltage stabilizing didoe ZD1, the normal phase input end 52 of the first comparator U1 is connected with the first end of the first resistance R1 by the 6th resistance R6, the power pins 55 of the first comparator U1 is connected with power supply VCC, grounding pin 54 ground connection of the first comparator U1.
Second comparison circuit 32 comprises: the second comparator U2 and the second reference circuit 321, second reference circuit 321 are for inputting the second reference voltage V H to the normal phase input end 62 of the second comparator U2.Second reference circuit 321 comprises the second voltage stabilizing didoe ZD2 and the 3rd resistance R3, the plus earth of the second voltage stabilizing didoe ZD2, the negative pole of the second voltage stabilizing didoe ZD2 is connected with power supply VCC by the 3rd resistance R3, VCC is higher than the voltage stabilizing value of the second voltage stabilizing didoe ZD2, second voltage stabilizing didoe ZD2 is reversed and punctures voltage stabilizing, and the voltage stabilizing value of ZD2 equals the second reference voltage V H.The reverse input end 61 of the second comparator U2 is connected with the normal phase input end 52 of the first comparator U1, the normal phase input end 62 of the second comparator U2 is connected with the negative pole of the second voltage stabilizing didoe ZD2, the power pins 65 of the second comparator U2 is connected with power supply VCC, grounding pin 64 ground connection of the second comparator U2.
Indicating circuit 4 comprises the first LED 1 and the second LED 2 be connected in parallel, wherein the positive pole of the first LED 1 is connected with the negative pole of the second LED 2, and the negative pole of the first LED 2 is connected with the positive pole of the second LED 2.The output 53 of the first comparator U1 is connected with the positive pole of the first LED 1 by the 7th resistance R7, and the output 63 of the second comparator is connected with indicating circuit 4 by the 8th resistance R8.
Send red light when supposing the first LED 1 conducting, during the second LED 2 conducting, send green light.
When circuit normally works, namely when the output current value i of constant-current drive circuit is at (i1, i2) time between, VL<VIN<VH, the output voltage of the first comparator U1 is identical with the output voltage values of the second comparator U2, first LED 1 and second LED 2 not conductings, namely the first LED 1 and the second LED 2 not luminous.
As the current value i<i1 that constant-current drive circuit exports, VIN<VL, then the output voltage of the first comparator U1 is less than the voltage that the second comparator U2 exports, then the first LED 1 ends, second LED 2 conducting, the second LED 2 sends green light.
As the current value i>i2 that constant-current drive circuit exports, VIN>VH, then the output voltage of the first comparator U1 is greater than the voltage that the second comparator U2 exports, then the first LED 1 conducting, second LED 2 ends, and the first LED 1 sends red light.
Therefore, whether luminous by observing the first Light-Emitting Diode LED1 and the second LED 2 in testing circuit, and the light of what color sent out, just and can know whether in allowed limits current value that constant-current drive circuit exports on the spot, intuitively, and when not in allowed limits time, constant-current drive circuit export current value be lower than lower limit or higher than higher limit.
It should be noted that, when the voltage stabilizing didoe that voltage stabilizing value just equals the first reference voltage or the second reference voltage can not find, first reference circuit 311 also can adopt bleeder circuit to realize, as shown in Figure 4, first reference circuit 311 comprises the second resistance R2 and the 4th resistance R4, the first end ground connection of the 4th resistance R4, second end of the 4th resistance R4 is connected with power supply VCC by the second resistance R2, the voltage that second end of the 4th resistance R4 is corresponding is the first reference voltage V L, then the 4th resistance R4 chooses resistance value and is
resistance.In like manner, second reference circuit 321 also can adopt bleeder circuit to realize, as shown in Figure 4, second reference circuit 321 comprises the 3rd resistance R3 and the 5th resistance R5, the first end ground connection of the 5th resistance R5, second end of the 5th resistance R5 is connected with power supply VCC by the 3rd resistance R3, and the voltage that second end of the 5th resistance R5 is corresponding is the second reference voltage V H, then the 5th resistance R4 chooses resistance value and is
Embodiment described above is only schematic, does not form the restriction to this technical scheme protection range.The amendment done within any spirit at above-mentioned execution mode and principle, equivalently to replace and improvement etc., within the protection range that all should be included in this technical scheme.
Claims (10)
1. a testing circuit, for whether in allowed limits detecting the electric current of constant-current drive circuit output, is characterized in that, comprise: bleeder circuit, indicating circuit and comparison circuit, wherein,
The first end of described bleeder circuit is connected with the output of described constant-current drive circuit, the second end ground connection of described bleeder circuit, and the voltage of described bleeder circuit first end is comparative voltage;
Described indicating circuit is connected with the output of described comparison circuit, sends the first branch road and second branch road of different colours light when comprising conducting;
The input of described comparison circuit is connected with the first end of described bleeder circuit, the output of described comparison circuit is connected with indicating circuit, described comparison circuit is used for providing the first reference voltage and the second reference voltage, and described first reference voltage and the second reference voltage are corresponding with the lower border value of the scope that electric current allows and upper boundary values respectively; When the electric current that constant-current drive circuit exports is greater than upper boundary values, described comparative voltage is greater than the second reference voltage, the first branch road conducting of described indicating circuit; When the electric current that constant-current drive circuit exports is less than lower border value, described comparative voltage is less than the first reference voltage, the second branch road conducting of described indicating circuit; When constant-current drive circuit export electric current in allowed limits time, the first branch road and second branch road not conductings.
2. testing circuit according to claim 1, is characterized in that, described comparison circuit comprises: the first comparison circuit and the second comparison circuit, wherein,
The first end of described first comparison circuit is connected with the first end of described bleeder circuit; Second end of described first comparison circuit is connected with the first end of the first end of described first branch road and described second branch road;
The first end of described second comparison circuit is connected with the first end of described bleeder circuit; Second end of described second comparison circuit is connected with the second end of the second end of described first branch road and described second branch road.
3. testing circuit according to claim 2, is characterized in that, described bleeder circuit comprises: the first resistance,
One end of described first resistance is that the first end of described bleeder circuit is connected with the output of described constant-current drive circuit, and the other end of described first resistance is the second end ground connection of described bleeder circuit.
4. testing circuit according to claim 2, is characterized in that, described first comparison circuit comprises: the first comparator and the first reference circuit, and described second comparison circuit comprises: the second comparator and the second reference circuit, wherein,
The normal phase input end of described first comparator is connected with the first end of described bleeder circuit; The inverting input of described first comparator is connected with the output of described first reference circuit;
Described first reference circuit, for inputting the first reference voltage to the inverting input of described first comparator;
The inverting input of described second comparator is connected with the first end of described bleeder circuit; The normal phase input end of described second comparator is connected with the output of described second reference circuit;
Described second reference circuit, for inputting the second reference voltage to the normal phase input end of described second comparator.
5. testing circuit according to claim 4, is characterized in that, described first reference circuit, comprising: the first voltage stabilizing didoe and the second resistance, wherein,
The plus earth of described first voltage stabilizing didoe, the negative pole of described first voltage stabilizing didoe is connected with power supply by described second resistance, and the reverse breakdown voltage of described first voltage stabilizing didoe is the first reference voltage.
6. testing circuit according to claim 4, is characterized in that, described first reference circuit, comprising: the second resistance and the 4th resistance, wherein,
The first end ground connection of described 4th resistance, the second end of described 4th resistance is connected with power supply by described second resistance, and the voltage that described 4th resistance second end is corresponding is the first reference voltage.
7. testing circuit according to claim 4, is characterized in that, described second reference circuit, comprising: the second voltage stabilizing didoe and the 3rd resistance, wherein,
The plus earth of described second voltage stabilizing didoe, the negative pole of described second voltage stabilizing didoe is connected with power supply by described 3rd resistance, and the reverse breakdown voltage of described second voltage stabilizing didoe is the second reference voltage.
8. testing circuit according to claim 4, is characterized in that, described second reference circuit, comprising: the 3rd resistance and the 5th resistance, wherein,
The first end ground connection of described 5th resistance, the second end of described 5th resistance is connected with power supply by described 3rd resistance, and the voltage that described 5th resistance second end is corresponding is the second reference voltage.
9. the testing circuit according to claim 2 to 8 any one, is characterized in that, described first branch road comprises the first light-emitting diode, and described second branch road comprises the second light-emitting diode, wherein,
The positive pole of described first light-emitting diode is connected with the output of described first comparator, and the negative pole of described first light-emitting diode is connected with the output of described second comparator;
The positive pole of described second light-emitting diode is connected with the output of described second comparator, and the negative pole of described second light-emitting diode is connected with the output of described first comparator;
The color of the light sent during described first LEDs ON is different from the color of the light sent during described second LEDs ON.
10. a lighting apparatus, is characterized in that, comprising: constant-current drive circuit, and the lighting source of connecting with the output of described constant-current drive circuit and right will remove the testing circuit described in 1-9 any one.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310649039.1A CN104703319B (en) | 2013-12-04 | 2013-12-04 | A kind of detection circuit and lighting apparatus |
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| CN201310649039.1A CN104703319B (en) | 2013-12-04 | 2013-12-04 | A kind of detection circuit and lighting apparatus |
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| CN104703319B CN104703319B (en) | 2019-02-05 |
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| 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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| CN104703319B (en) | 2019-02-05 |
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