CN202035195U - Direct-current constant current source and application circuit thereof - Google Patents
Direct-current constant current source and application circuit thereof Download PDFInfo
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- CN202035195U CN202035195U CN2011201183637U CN201120118363U CN202035195U CN 202035195 U CN202035195 U CN 202035195U CN 2011201183637 U CN2011201183637 U CN 2011201183637U CN 201120118363 U CN201120118363 U CN 201120118363U CN 202035195 U CN202035195 U CN 202035195U
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Abstract
The utility model discloses a direct-current constant current source and an application circuit thereof, relating to the technology of electronic circuits, in particular to a direct-current constant current source for a lamp lighting circuit and an application circuit thereof. The technical key point in the utility model is as follows: by adopting a variable voltage-constant current dividing way, independent constant current drive is realized to all branches of serial groups of parallel LEDs (light-emitting diode); after the alternating-current power supply is converted into the direct current, the constant-voltage power supply is supplied to the serial groups of the LEDs (light-emitting diode); the branch of each luminaire is connected in series with the direct-current constant current source respectively, thus realizing the independent constant current control on the serial group of each parallel branch LED (light-emitting diode). The direct-current constant current source can effectively realize the constant current in the serial group of each parallel branch LED (light-emitting diode), simultaneously plays the role of protecting the LED (light-emitting diode) serial group, has a simple structure and is mainly used for the circuits consisting of LED (light-emitting diode) strings.
Description
Technical field
The utility model relates to electronic circuit technology, particularly a kind of dc constant current power supply and application circuit thereof that is used for the lamp lighting circuit.
Background technology
At present, great majority are made up of the LED light-emitting diode in the LED illuminating product, and the circuit structure of LED illuminating lamp is that a plurality of LED light emitting diode string joint groups become LED lamp string, and a plurality of LED lamp strings are parallel to the two ends of single direct current constant-current driving power supply again.
There is following deficiency in such circuit structure: when wherein opening circuit appearred in a string LED lamp string, the electric current in other LED lamp string branch roads can raise, and causes the lost of life of LED, even damages whole LED luminous tubes.
The utility model content
Goal of the invention of the present utility model is: at the problem of above-mentioned existence, provide a kind of dc constant current power supply circuit and application circuit thereof.
The technical scheme that the disclosed dc constant current power supply of the utility model adopts is such: comprise first resistance, second resistance, first diode, second diode and triode, first end of described first resistance, first diode, second end, first diode, first end are connected successively with second end of second diode; And second end of described first diode is identical with the second end polarity of second diode; First resistance is connected with the base stage of described triode with the public connecting end of first diode; The emitter of described triode is connected with first end of second resistance; First end of described second diode is connected with second end of second resistance; Second end of described first resistance and the collector electrode of triode constitute the output port of dc constant current power supply; The common port of described second diode and second resistance and second end of first resistance constitute the voltage input end mouth of dc constant current power supply.
The supplementary technology scheme that dc constant current power supply adopts is such:
Preferably, second end of described first diode and second diode is anode, and first end of first diode and second diode is negative electrode; Described triode is a NPN type triode.
Preferably, second end of described first diode and second diode is negative electrode, and first end of first diode and second diode is anode; Described triode is the positive-negative-positive triode.
Preferably, described first diode and second diode are the PN junction temperature sensor.
The application circuit of described dc constant current power supply has adopted following technical scheme, comprises DC power supply, light fixture, it is characterized in that, also comprises dc constant current power supply, and described light fixture is N, and described dc constant current power supply quantity is consistent with light fixture quantity, and described N is equal to, or greater than 2;
N dc constant current power supply is parallel on the described DC power supply, and a described N light fixture inserts the output port of a described N dc constant current power supply respectively.
The supplementary technology scheme that the dc constant current power supply application circuit adopts is such:
Preferably, described DC power supply comprises AC power and AC-DC converter; The input of described AC-DC converter is connected with AC power; The output of described AC-DC converter is a dc power output end.
Preferably, described dc constant current power supply, comprise first resistance, second resistance, first diode, second diode and triode, it is characterized in that first end of described first resistance, first diode, second end, first diode, first end are connected successively with second end of second diode; And second end of described first diode is identical with the second end polarity of second diode; First resistance is connected with the base stage of described triode with the public connecting end of first diode; The emitter of described triode is connected with first end of second resistance; First end of described second diode is connected with second end of second resistance; Second end of described first resistance and the collector electrode of triode constitute the output port of dc constant current power supply; The common port of described second diode and second resistance and second end of first resistance constitute the voltage input end mouth of dc constant current power supply.
Preferably, second end of described first diode and second diode is anode, and first end of first diode and second diode is negative electrode; Described triode is a NPN type triode.
Preferably, second end of described first diode and second diode is negative electrode, and first end of first diode and second diode is anode; Described triode is the positive-negative-positive triode.
Preferably, described first diode and second diode are the PN junction temperature sensor.
In sum, owing to adopted technique scheme, the beneficial effects of the utility model are:
1, dc constant current power supply can be realized the constant function of output current (the constant current principle is seen embodiment);
2, because the diode in the dc constant current power supply is the PN junction temperature sensor; when circuit temperature rose, because the characteristic of PN junction temperature sensor, its voltage was with high reduction the on the temperature; this moment, the output current of dc constant current power supply reduced, thereby had further protected light fixture.
When 3, the dc constant current power supply in the utility model is applied in the color lamp circuit that LED lamp string forms, the constant-current driving that can effectively solve LED lamp string on each parallel branch is damaged problem, guaranteed the economy of LED lighting circuit and driven efficient, the constant-current characteristics of LED has more guaranteed luminous continuity---realize that zero flicker drives.
4, circuit structure is simple, production cost is low.
Description of drawings
Fig. 1 is a dc constant current power supply circuit structure in the utility model.
Fig. 2 is the dc constant current power supply application circuit.
Mark among the figure: 1 AC-DC converter, 2 dc constant current power supplies, 3 light fixtures.
Embodiment
Below in conjunction with accompanying drawing, the utility model is done detailed explanation.
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
As shown in Figure 1, an embodiment of the dc constant current power supply in the utility model is: comprise first resistance R 1, second resistance R 2, the first diode D1, the second diode D2 and NPN type triode, the negative electrode of first end of described first resistance R 1, the first diode D1 anode, the first diode D1 is connected successively with the anode of the second diode D2; First resistance R 1 is connected with the base stage of described triode with the public connecting end of the first diode D1; The emitter of described triode is connected with first end of second resistance R 2; The negative electrode of the described second diode D2 is connected with second end of second resistance R 2; Second end of described first resistance R 1 and the collector electrode of triode constitute the output port of dc constant current power supply; The common port of the described second diode D2 and second resistance R 2 and second end of first resistance R 1 constitute the voltage input end mouth of dc constant current power supply.
Another embodiment of dc constant current power supply in the utility model is: comprise first resistance R 1, second resistance R 2, the first diode D1, the second diode D2 and positive-negative-positive triode, the anode of first end of described first resistance R 1, the first diode D1 negative electrode, the first diode D1 is connected successively with the negative electrode of the second diode D2; First resistance R 1 is connected with the base stage of described triode with the public connecting end of the first diode D1; The emitter of described triode is connected with first end of second resistance R 2; The anode of the described second diode D2 is connected with second end of second resistance R 2; Second end of described first resistance R 1 and the collector electrode of triode constitute the output port of dc constant current power supply; The common port of the described second diode D2 and second resistance R 2 and second end of first resistance R 1 constitute the voltage input end mouth of dc constant current power supply.
The first diode D1 and the second diode D2 among above-mentioned two kinds of embodiment of dc constant current power supply are the PN junction temperature sensor.
In the utility model, the constant current principle of dc constant current power supply is, after inserting voltage source at its voltage input end mouth, because the characteristic of diode, first and second diode D1, voltage on the D2 is a steady state value, be respectively U1 and U2, from first, the second diode D1, D2, the base stage of triode and the PN junction between the emitter (supposition PN junction voltage is U3), the loop that second resistance R 2 is formed, according to Kirchhoff's second law, be not difficult to learn, voltage on second resistance R 2 equals a voltage U=U1+U2-U3 on the diode, makes that second resistance is R, the electric current I e=U/R of second resistance R, 2 branch roads, again according to the current characteristics (current amplification factor is β) of triode, the output current Iout=Ie* of dc constant current power supply (1+ β)/(2+ β).The output current that this shows dc constant current power supply is constant, and its size only depends on the characteristic and second resistance of diode, triode.
When selecting for use the PN junction transducer to realize the function of described two diodes, because raising with temperature, reduces the voltage of PN junction, according to top formula, be not difficult to learn that Iout will diminish, thereby play the effect of protection light fixture.
Need it is worthy of note according to above-mentioned constant current principle as can be known the diode in the dc constant current power supply be not limited to two, as long as quantity is greater than 1, the annexation of many diodes is the same with the connected mode of two diodes, does not repeat them here.As seen two diodes in the utility model are replaced with the replacement that is equal to that belongs to technical solutions of the utility model more than the connectivity scenario of two diodes.
As Fig. 2, the application circuit of described dc constant current power supply has adopted following technical scheme, comprises DC power supply, light fixture, also comprises described dc constant current power supply, and described light fixture is N, and described dc constant current power supply quantity is consistent with light fixture quantity, and described N is equal to, or greater than 2;
The connection parallel with one another of the voltage output end of N dc constant current power supply, its public voltage input end inserts DC power supply, and a described N light fixture inserts the output port of a described N dc constant current power supply respectively.
Described direct voltage source can be realized by AC power and AC-DC converter combination; The input of described AC-DC converter is connected with AC power; The output of described AC-DC converter is a dc power output end.
The utility model is mainly used in the illumination or color lamp circuit of composition of LED lamp string, but is not limited to this kind application, can also be used for the circuit structure that other is similar to this many light fixture parallel connections of above-mentioned illumination or color lamp circuit.
The LED lamp string that light fixture described in the utility model can constitute for the LED light-emitting diode or by LED light emitting diode string joint group or the light fixture of other DC power supplies.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (10)
1. dc constant current power supply, comprise first resistance, second resistance, first diode, second diode and triode, it is characterized in that first end of described first resistance, first diode, second end, first diode, first end are connected successively with second end of second diode; And second end of described first diode is identical with the second end polarity of second diode; First resistance is connected with the base stage of described triode with the public connecting end of first diode; The emitter of described triode is connected with first end of second resistance; First end of described second diode is connected with second end of second resistance; Second end of described first resistance and the collector electrode of triode constitute the output port of dc constant current power supply; The common port of described second diode and second resistance and second end of first resistance constitute the voltage input end mouth of dc constant current power supply.
2. a kind of dc constant current power supply according to claim 1 is characterized in that, second end of described first diode and second diode is anode, and first end of first diode and second diode is negative electrode; Described triode is a NPN type triode.
3. a kind of dc constant current power supply according to claim 1 is characterized in that, second end of described first diode and second diode is negative electrode, and first end of first diode and second diode is anode; Described triode is the positive-negative-positive triode.
4. according to claim 1 or 2 or 3 described a kind of dc constant current power supplies, it is characterized in that described first diode and second diode are the PN junction temperature sensor.
5. comprise the dc constant current power supply application circuit of any described dc constant current power supply in the claim 1 to 4, comprise DC power supply, light fixture, it is characterized in that, also comprise dc constant current power supply, described light fixture is N, and described dc constant current power supply quantity is consistent with light fixture quantity, and described N is equal to, or greater than 2;
N dc constant current power supply is parallel on the described DC power supply, and a described N light fixture inserts the output port of a described N dc constant current power supply respectively.
6. dc constant current power supply application circuit according to claim 5 is characterized in that described DC power supply comprises AC power and AC-DC converter; The input of described AC-DC converter is connected with AC power; The output of described AC-DC converter is a dc power output end.
7. dc constant current power supply application circuit according to claim 5, it is characterized in that, described dc constant current power supply, comprise first resistance, second resistance, first diode, second diode and triode, it is characterized in that first end of described first resistance, first diode, second end, first diode, first end are connected successively with second end of second diode; And second end of described first diode is identical with the second end polarity of second diode; First resistance is connected with the base stage of described triode with the public connecting end of first diode; The emitter of described triode is connected with first end of second resistance; First end of described second diode is connected with second end of second resistance; Second end of described first resistance and the collector electrode of triode constitute the output port of dc constant current power supply; The common port of described second diode and second resistance and second end of first resistance constitute the voltage input end mouth of dc constant current power supply.
8. dc constant current power supply application circuit according to claim 7 is characterized in that, second end of described first diode and second diode is anode, and first end of first diode and second diode is negative electrode; Described triode is a NPN type triode.
9. dc constant current power supply application circuit according to claim 7 is characterized in that, second end of described first diode and second diode is negative electrode, and first end of first diode and second diode is anode; Described triode is the positive-negative-positive triode.
10. according to claim 7 or 8 or 9 described dc constant current power supply application circuits, it is characterized in that described first diode and second diode are the PN junction temperature sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011201183637U CN202035195U (en) | 2011-04-21 | 2011-04-21 | Direct-current constant current source and application circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201183637U CN202035195U (en) | 2011-04-21 | 2011-04-21 | Direct-current constant current source and application circuit thereof |
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| CN202035195U true CN202035195U (en) | 2011-11-09 |
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| CN2011201183637U Expired - Fee Related CN202035195U (en) | 2011-04-21 | 2011-04-21 | Direct-current constant current source and application circuit thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104105271A (en) * | 2014-08-04 | 2014-10-15 | 无锡市市北高级中学 | Automatic LED series-parallel connection switching circuit |
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2011
- 2011-04-21 CN CN2011201183637U patent/CN202035195U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104105271A (en) * | 2014-08-04 | 2014-10-15 | 无锡市市北高级中学 | Automatic LED series-parallel connection switching circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111109 Termination date: 20140421 |