CN204598363U - A kind of constant current driving device - Google Patents
A kind of constant current driving device Download PDFInfo
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- CN204598363U CN204598363U CN201520127041.7U CN201520127041U CN204598363U CN 204598363 U CN204598363 U CN 204598363U CN 201520127041 U CN201520127041 U CN 201520127041U CN 204598363 U CN204598363 U CN 204598363U
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Abstract
The utility model embodiment discloses a kind of constant current driving device, belong to the circuit arrangement field of electric light source, comprise: power supply, LED group, open circuit, first diode and the second diode, power supply respectively with the cathode terminal of described first diode, the cathode terminal of described second diode is connected with the input of described LED group, the anode tap of described second diode is connected with the start end of described open circuit, the output of described LED group is connected with the input of described open circuit, the anode tap of described first diode is all connected with the negative pole of described power supply with the output of described open circuit.The purpose of this utility model is to provide a kind of constant current driving device, effectively to reduce the cost of low turn-on voltage device in existing open circuit.
Description
Technical field
The utility model relates to the circuit arrangement field of electric light source, in particular to a kind of constant current driving device.
Background technology
LED illumination has the advantages such as luminous efficiency is high, life-span length, energy saving standard, is applied to the occasions such as street lamp, Tunnel Lamp and room lighting more and more widely.AC-powered LED illumination can reduce costs, but voltage ripple of power network can cause LED overcurrent drive and affect its useful life, so it is important for carrying out constant current driving in the occasion of Alternating Current Power Supply to LED.
The circuit or the electrical equipment that realize constant current at present have a variety of, more representational have three kinds, respectively: adopt depletion type power MOS (Metal Oxide Semiconductor) device, amplifier constant-current source and MOS type hybrid circuit, in order to reduce the loss of open circuit, need the cut-in voltage reducing open circuit, prior art adopts low pressure voltage stabilizing chip, can reach the effect of the low turn-on voltage of open circuit, but manufacturing cost is too high.
Utility model content
The purpose of this utility model is to provide a kind of constant current driving device, effectively to reduce the cost of low turn-on voltage device in existing open circuit.
First aspect, a kind of constant current driving device that the utility model provides, comprise: power supply, LED group, open circuit, first diode and the second diode, power supply respectively with the cathode terminal of described first diode, the cathode terminal of described second diode is connected with the input of described LED group, the anode tap of described second diode is connected with the start end of described open circuit, the output of described LED group is connected with the input of described open circuit, the anode tap of described first diode is all connected with the negative pole of described power supply with the output of described open circuit.
In conjunction with first aspect, the utility model embodiment still provides the first possibility execution mode of first aspect, wherein, described open circuit comprises the first triode, the base stage of described first triode is the start end of described open circuit, the input of the very described open circuit of current collection of described first triode, the anode tap of described second diode is connected with the base stage of described first triode, and the collector electrode of described first triode is connected with the output of described LED group.
In conjunction with the first possibility execution mode of first aspect, the utility model embodiment still provides the second possibility execution mode of first aspect, wherein, described open circuit also comprises the first resistance, the emitter of described first triode is connected with one end of described first resistance, and the other end of described first resistance is connected with the negative pole of described power supply.
In conjunction with first aspect, the utility model embodiment still provides the third possibility execution mode of first aspect, wherein, also comprise the second resistance, described power supply is connected with one end of described second resistance, and the other end of described second resistance is connected with the cathode terminal of described first diode and the cathode terminal of described second diode respectively.
In conjunction with the second possibility execution mode of first aspect, the utility model embodiment still provides the 4th kind of possibility execution mode of first aspect, wherein, described first resistance is variable resistor, the emitter of described first triode is connected with a stiff end of described first resistance, and another stiff end of described first resistance is connected with the negative pole of described power supply.
In conjunction with the third possibility execution mode of first aspect, the utility model embodiment still provides the 5th kind of possibility execution mode of first aspect, wherein, described second resistance is variable resistor, described power supply is connected with a stiff end of described second resistance, and another stiff end of described second resistance is connected with the cathode terminal of described first diode and the cathode terminal of described second diode respectively.
In conjunction with first aspect, the utility model embodiment still provides the 6th kind of possibility execution mode of first aspect, and wherein, described first diode and described second diode are voltage stabilizing didoe.
In conjunction with the second possibility execution mode of first aspect, the utility model embodiment still provides the 7th kind of possibility execution mode of first aspect, wherein, described first triode is Darlington transistor, described Darlington transistor comprises the second triode and the 3rd triode, the anode tap of described second diode is connected with the base stage of described second triode, the collector electrode of described second triode is connected with the base stage of described 3rd triode, the emitter of described 3rd triode is connected with the output of described LED group, the emitter of described second triode is all connected with one end of described first resistance with the collector electrode of described 3rd triode.
In conjunction with the first possibility execution mode of first aspect, the utility model embodiment still provides the 8th kind of possibility execution mode of first aspect, wherein, described first triode is field effect transistor, the anode tap of described second diode is connected with the grid of described field effect transistor, the drain electrode of field effect transistor is connected with the output of described LED group, and the source electrode of described field effect transistor is connected with one end of described first resistance.
In the utility model embodiment, described first diode and described second reversal of diode are in circuit, described first diode and described second diode reach at the voltage at its two ends and make before it punctures, the internal resistance of described first diode and described second diode is very high, the start end of described open circuit is made to be in off state, when the both end voltage of described first diode and described diode makes described first diode and described diode all be in breakdown conditions, described first diode and the internal resistance now of described second diode less, now the magnitude of voltage of the start end of described open circuit equals the difference of the voltage at described first diode two ends and the voltage at described second diode two ends, because described first diode and the described second diode voltage when reverse breakdown is highly stable, therefore make the magnitude of voltage of the start end of described open circuit stablize to equal the difference of the voltage at described first diode two ends and the voltage at described second diode two ends, by setting the puncture voltage of described first diode and described second diode, the difference of the voltage at the voltage at described first diode two ends and described second diode two ends is made to be stabilized in a less value, and then make the magnitude of voltage of the start end of described open circuit be stabilized in a less value.
Therefore, with prior art utilize low pressure voltage stabilizing chip, the effect reaching the low turn-on voltage of open circuit is compared, the utility model embodiment realizes the low turn-on voltage of open circuit by two diodes, structure is simple, cost is low, is convenient to integrated, effectively reduces the cost of low turn-on voltage device in existing open circuit.
Other feature and advantage of the present utility model are set forth at specification subsequently, and, partly become apparent from specification, or understand by implementing the utility model embodiment.The purpose of this utility model and other advantages realize by structure specifically noted in write specification, claims and accompanying drawing and obtain.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, 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.Shown in accompanying drawing, above-mentioned and other object of the present utility model, Characteristics and advantages will be more clear.Reference numeral identical in whole accompanying drawing indicates identical part.Deliberately do not draw accompanying drawing by actual size equal proportion convergent-divergent, focus on purport of the present utility model is shown.
Fig. 1 shows the circuit structure diagram of the embodiment of a kind of constant current driving device that the utility model embodiment provides;
Fig. 2 shows the circuit structure diagram of the embodiment of the another kind of constant current driving device that the utility model embodiment provides;
Fig. 3 shows the circuit structure diagram of the embodiment of the another kind of constant current driving device that the utility model embodiment provides;
Fig. 4 shows the circuit structure diagram of the embodiment of the another kind of constant current driving device that the utility model embodiment provides.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, carry out clear, complete description to the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
LED illumination has the advantages such as luminous efficiency is high, life-span length, energy saving standard, is applied to the occasions such as street lamp, Tunnel Lamp and room lighting more and more widely.AC-powered LED illumination can reduce costs, but voltage ripple of power network can cause LED overcurrent drive and affect its useful life, so it is important for carrying out constant current driving in the occasion of Alternating Current Power Supply to LED.
The circuit or the electrical equipment that realize constant current at present have a variety of, more representational have three kinds, respectively: adopt depletion type power MOS (Metal Oxide Semiconductor) device, amplifier constant-current source and MOS type hybrid circuit, in order to reduce the loss of open circuit, need the cut-in voltage reducing open circuit, prior art adopts low pressure voltage stabilizing chip, can reach the effect of the low turn-on voltage of open circuit, but manufacturing cost is too high.
A kind of constant current driving device as shown in Figure 1, comprise: power supply, LED group, open circuit, first diode D1 and the second diode D2, power supply respectively with the cathode terminal of described first diode D1, the cathode terminal of described second diode D2 is connected with the input of described LED group, the anode tap of described second diode D2 is connected with the start end of described open circuit, the output of described LED group is connected with the input of described open circuit, the described anode tap of the first diode D1 is all connected with the negative pole of described power supply with the output of described open circuit.
In the utility model embodiment, described LED group is composed in series by multiple light-emitting diode, wherein, the anode tap of the light-emitting diode of not connecting with other light-emitting diodes is the input of described LED group, and the cathode terminal of the light-emitting diode of not connecting with other light-emitting diodes is the output of described LED group.
In the utility model embodiment, described first diode D1 and described second diode D2 reversal connection are in circuit, described first diode D1 and described second diode D2 reaches at the voltage at its two ends and makes before it punctures, the internal resistance of described first diode D1 and described second diode D2 is very high, the start end of described open circuit is made to be in off state, when the both end voltage of described first diode D1 and described second diode D2 makes described first diode D1 and described second diode D2 all be in breakdown conditions, described first diode D1 and described second diode D2 internal resistance now less, now the magnitude of voltage of the start end of described open circuit equals the difference of the voltage at described first diode D1 two ends and the voltage at described second diode D2 two ends, because the voltage of described first diode D1 and described second diode D2 when reverse breakdown is highly stable, therefore make the magnitude of voltage of the start end of described open circuit stablize to equal the difference of the voltage at described first diode D1 two ends and the voltage at described second diode D2 two ends, by setting the puncture voltage of described first diode D1 and described second diode D2, the difference of the voltage at the voltage at described first diode D1 two ends and described second diode D2 two ends is made to be stabilized in a less value, and then make the magnitude of voltage of the start end of described open circuit be stabilized in a less value.
Therefore, with prior art utilize low pressure voltage stabilizing chip, the effect reaching the low turn-on voltage of open circuit is compared, the utility model embodiment realizes the low turn-on voltage of open circuit by two diodes, structure is simple, cost is low, is convenient to integrated, effectively reduces the cost of low turn-on voltage device in existing open circuit.
Preferably, in the utility model embodiment, described first diode D1 and described second diode D2 is voltage stabilizing didoe.
The embodiment of another kind of constant-current drive circuit as shown in Figure 2, comprise: power supply, LED group, first triode Q1, first resistance R1, second resistance R2, first diode D1 and the second diode D2, power supply respectively with the cathode terminal of described first diode D1, the cathode terminal of described second diode D2 is connected with the input of described LED group, the anode tap of described second diode D2 is connected with the base stage of described first triode Q1, the collector electrode of described first triode Q1 is connected with the output of described LED group, the anode tap of described first diode D1 is connected with the negative pole of described power supply, the emitter of described first triode Q1 is connected with one end of described first resistance R1, the other end of described first resistance R1 is connected with the negative pole of described power supply, described power supply is connected with one end of described second resistance R2, the other end of described second resistance R2 is connected with the cathode terminal of described first diode D1 and the cathode terminal of described second diode D2 respectively.
Wherein, the first triode Q1 and the first resistance R1 forms open circuit.
In the utility model embodiment, when the base voltage of described first triode Q1 is greater than the conducting voltage of described first triode Q1, then described first triode Q1 conducting, namely described open circuit is opened, therefore, the voltage between the base stage of described first triode Q1 and emitter is the cut-in voltage of described open circuit.
In the utility model embodiment, described first diode D1 and described second diode D2 reversal connection are in circuit, described first diode D1 and described second diode D2 reaches at the voltage at its two ends and makes before it punctures, the internal resistance of described first diode D1 and described second diode D2 is very high, make the base stage of described first triode Q1 by open circuit, thus described first triode Q1 is ended, when the both end voltage of described first diode D1 and described second diode D2 makes described first diode D1 and described second diode D2 all be in breakdown conditions, described first diode D1 and described second diode D2 internal resistance now less, now the magnitude of voltage of the start end of described open circuit equals the difference of the voltage at described first diode D1 two ends and the voltage at described second diode D2 two ends, because the voltage of described first diode D1 and described second diode D2 when reverse breakdown is highly stable, therefore make the magnitude of voltage of the start end of described open circuit stablize to equal the difference of the voltage at described first diode D1 two ends and the voltage at described second diode D2 two ends, by setting the puncture voltage of described first diode D1 and described second diode D2, the difference of the voltage at the voltage at described first diode D1 two ends and described second diode D2 two ends is made to be stabilized in a less value, and then make the cut-in voltage of described open circuit be stabilized in a less value.
In addition, in the utility model embodiment, described first resistance R1 and described second resistance R2 can be all variable resistor, the emitter of described first triode Q1 is connected with a stiff end of described first resistance R1, another stiff end of described first resistance R1 is connected with the negative pole of described power supply, described power supply is connected with a stiff end of described second resistance R2, and another stiff end of described second resistance R2 is connected with the cathode terminal of described first diode D1 and the cathode terminal of described second diode D2 respectively.
The voltage at the two ends of described first diode D1 and described second diode D2 is regulated by the resistance changing described second resistance R2.
The resistance of described first resistance R1 affects the cut-in voltage of described open circuit, by changing the puncture voltage of the resistance of the first resistance R1, the puncture voltage of the first diode D1 and the second diode D2, the cut-in voltage of described open circuit is stabilized between 1 ~ 2V.
Such as, suppose that power supply is 12V, described LED group is composed in series by three light-emitting diodes, and the voltage of each light-emitting diode is 3.1V, then the voltage of LED group is 9.3V, then the constant cut-in voltage of described open circuit is 1.5V.
Therefore, with prior art utilize low pressure voltage stabilizing chip, the effect reaching the low turn-on voltage of open circuit is compared, the utility model embodiment realizes the low turn-on voltage of open circuit by two diodes, structure is simple, cost is low, is convenient to integrated, effectively reduces the cost of low turn-on voltage device in existing open circuit.
A kind of constant current driving device as shown in Figure 3, comprise: power supply, LED group, open circuit, first diode D1 and the second diode D2, power supply respectively with the cathode terminal of described first diode D1, the cathode terminal of described second diode D2 is connected with the input of described LED group, the anode tap of described second diode D2 is connected with the start end of described open circuit, the output of described LED group is connected with the input of described open circuit, the described anode tap of the first diode D1 is all connected with the negative pole of described power supply with the output of described open circuit.
Described constant current driving device also comprises the second resistance R2, and described power supply is connected with one end of described second resistance R2, and the other end of described second resistance R2 is connected with the cathode terminal of described first diode D1 and the cathode terminal of described second diode D2 respectively.
Described open circuit comprises Darlington transistor and the first resistance R1, described Darlington transistor comprises the second triode Q2 and the 3rd triode Q3, the anode tap of described second diode D2 is connected with the base stage of described second triode Q2, the collector electrode of described second triode Q2 is connected with the base stage of described 3rd triode Q3, the emitter of described 3rd triode Q3 is connected with the output of described LED group, and the emitter of described second triode Q2 is all connected with one end of described first resistance R1 with the collector electrode of described 3rd triode Q3.
In embodiment shown in Fig. 3, the Darlington transistor consisted of described second triode Q2 and the 3rd triode Q3 is replaced the first triode Q1 in Fig. 2, those skilled in the art can be well understood to, for convenience and simplicity of description, the specific works process of the device that Fig. 3 describes and circuit, with reference to the corresponding process in earlier figures 1 and Fig. 2 embodiment, can not repeat them here.
A kind of constant current driving device as shown in Figure 4, comprise: power supply, LED group, open circuit, first diode D1 and the second diode D2, power supply respectively with the cathode terminal of described first diode D1, the cathode terminal of described second diode D2 is connected with the input of described LED group, the anode tap of described second diode D2 is connected with the start end of described open circuit, the output of described LED group is connected with the input of described open circuit, the described anode tap of the first diode D1 is all connected with the negative pole of described power supply with the output of described open circuit.
Described constant current driving device also comprises the second resistance R2, and described power supply is connected with one end of described second resistance R2, and the other end of described second resistance R2 is connected with the cathode terminal of described first diode D1 and the cathode terminal of described second diode D2 respectively.
Described open circuit comprises field effect transistor VT and the first resistance R1, the anode tap of described second diode D2 is connected with the grid of described field effect transistor VT, the drain electrode of field effect transistor VT is connected with the output of described LED group, and the source electrode of described field effect transistor VT is connected with one end of described first resistance R1.
In embodiment shown in Fig. 4, described field effect transistor VT is replaced the first triode Q1 in Fig. 2, those skilled in the art can be well understood to, for convenience and simplicity of description, the specific works process of the device that Fig. 4 describes and circuit, with reference to the corresponding process in earlier figures 1, Fig. 2 and Fig. 3 embodiment, can not repeat them here.
It should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (9)
1. a constant current driving device, it is characterized in that, comprise: power supply, LED group, open circuit, the first diode and the second diode, power supply is connected with the input of the cathode terminal of described first diode, the cathode terminal of described second diode and described LED group respectively, the anode tap of described second diode is connected with the start end of described open circuit, the output of described LED group is connected with the input of described open circuit, and the anode tap of described first diode is all connected with the negative pole of described power supply with the output of described open circuit.
2. constant current driving device according to claim 1, it is characterized in that, described open circuit comprises the first triode, the base stage of described first triode is the start end of described open circuit, the input of the very described open circuit of current collection of described first triode, the anode tap of described second diode is connected with the base stage of described first triode, and the collector electrode of described first triode is connected with the output of described LED group.
3. constant current driving device according to claim 2, it is characterized in that, described open circuit also comprises the first resistance, and the emitter of described first triode is connected with one end of described first resistance, and the other end of described first resistance is connected with the negative pole of described power supply.
4. constant current driving device according to claim 1, it is characterized in that, also comprise the second resistance, described power supply is connected with one end of described second resistance, and the other end of described second resistance is connected with the cathode terminal of described first diode and the cathode terminal of described second diode respectively.
5. constant current driving device according to claim 3, it is characterized in that, described first resistance is variable resistor, and the emitter of described first triode is connected with a stiff end of described first resistance, and another stiff end of described first resistance is connected with the negative pole of described power supply.
6. constant current driving device according to claim 4, it is characterized in that, described second resistance is variable resistor, described power supply is connected with a stiff end of described second resistance, and another stiff end of described second resistance is connected with the cathode terminal of described first diode and the cathode terminal of described second diode respectively.
7. constant current driving device according to claim 1, is characterized in that, described first diode and described second diode are voltage stabilizing didoe.
8. constant current driving device according to claim 3, it is characterized in that, described first triode is Darlington transistor, described Darlington transistor comprises the second triode and the 3rd triode, the anode tap of described second diode is connected with the base stage of described second triode, the collector electrode of described second triode is connected with the base stage of described 3rd triode, the emitter of described 3rd triode is connected with the output of described LED group, and the emitter of described second triode is all connected with one end of described first resistance with the collector electrode of described 3rd triode.
9. constant current driving device according to claim 3, it is characterized in that, described first triode is field effect transistor, the anode tap of described second diode is connected with the grid of described field effect transistor, the drain electrode of field effect transistor is connected with the output of described LED group, and the source electrode of described field effect transistor is connected with one end of described first resistance.
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| CN201520127041.7U CN204598363U (en) | 2015-03-05 | 2015-03-05 | A kind of constant current driving device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104661414A (en) * | 2015-03-05 | 2015-05-27 | 深圳快星半导体照明股份有限公司 | Constant-current driving device and starting method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104661414A (en) * | 2015-03-05 | 2015-05-27 | 深圳快星半导体照明股份有限公司 | Constant-current driving device and starting method thereof |
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Effective date of registration: 20180316 Address after: 443000, No. 197, East Main Road, Mao Ping Town, Zigui County, Yichang, Hubei Patentee after: HUBEI FANGJING ELECTRONIC TECHNOLOGY CO.,LTD. Address before: 3 A District, ten floor, tenth Industrial Zone, Tian Liao community office, Gongming office, Guangming District, Shenzhen, Guangdong, 518107 Patentee before: SHENZHEN FASTSTAR SEMICONDUCTOR LIGHTING CO.,LTD. |
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