CN203279286U - Dynamic constant current circuit - Google Patents
Dynamic constant current circuit Download PDFInfo
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- CN203279286U CN203279286U CN 201320276473 CN201320276473U CN203279286U CN 203279286 U CN203279286 U CN 203279286U CN 201320276473 CN201320276473 CN 201320276473 CN 201320276473 U CN201320276473 U CN 201320276473U CN 203279286 U CN203279286 U CN 203279286U
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Abstract
The utility model discloses a dynamic constant current circuit which comprises a number of light-emitting diodes. A number of light-emitting diodes are connected in series through a wire, and then are connected with a direct current power supply on one hand and are connected with the collector of a triode Q1 on the other hand. A wire is led out from the emitter of the triode Q1, is connected in series with a current detection resistor and then is grounded. A wire is led out from the base of the triode Q1 and is connected with the output end of an AND logic circuit. A drive bias resistor is connected in parallel between the base and the collector of the triode Q1. A wire is led out from an input end of the AND logic circuit and is connected with a reference power supply. A wire is led out from the other input end of the AND logic circuit and is connected with the collector of a triode Q2. A wire is led out from the base of the triode Q2 and is connected with the emitter of the triode Q1. According to the utility model, the circuit has the characteristics of reasonable structure, low loss and low calorific value; the lighting efficiency of an LED lamp can be improved; the service life of the LED lamp is prolonged; and the reliability of the LED lamp is improved.
Description
Technical field
The utility model relates to the special-purpose dynamically constant-current circuit of a kind of LED illumination.
Background technology
The LED lamp needs better more professional constant current to drive, and to realize high-effect long-life environmental protection and energy saving requirement of LED lamp, the LED lamp generally adopts linear constant current.The problems such as prior art generally exists loss large, and caloric value is high, affects whole light effect low, and the life-span is short.
The utility model content
The purpose of this utility model is to provide a kind of dynamic constant-current circuit, and large to solve the loss that existing linear constant current technology exists, caloric value is high, affect whole light imitate low, the problem such as the life-span is short.
The technical solution of the utility model is as follows:
a kind of dynamic constant-current circuit, include a plurality of light-emitting diodes, triode Q1, Q2, with logical circuit Y1, current sense resistor R1 and driving biasing resistor R2, it is characterized in that: after described a plurality of light-emitting diodes are in series by wire, be connected with DC power supply Vcc on the one hand, collector electrode with described triode Q1 is connected on the other hand, draw wire and the rear ground connection of series current detection resistance R 1 from the emitter of described triode Q1, draw wire and be connected with output with logical circuit Y1 from the base stage of triode Q1, described driving biasing resistor R2 is connected in parallel between the base stage and collector electrode of triode Q1, draw wire with the input of logical circuit Y1 and be connected with reference power supply Ver from described, from drawing wire with another input of logical circuit Y1 and being connected with the collector electrode of triode Q2, draw wire and be connected with the emitter of triode Q1 from the base stage of described triode Q2, drawing ground connection after wire from the emitter of triode Q2.
Described dynamic constant-current circuit, it is characterized in that: in described a plurality of light-emitting diodes, the anode of first light-emitting diode is connected with DC power supply Vcc by wire, and the negative electrode of last light-emitting diode is connected by the collector electrode of wire with described triode Q1.
Described dynamic constant-current circuit is characterized in that: described triode Q1 is switch triode, and described triode Q2 is amplifying triode.
The beneficial effects of the utility model:
The utility model circuit structure is reasonable, has the advantages that loss is low, caloric value is low, can improve the illumination efficiency of LED lamp, has extended the useful life of LED lamp, has improved the reliability of LED lamp.
Description of drawings
Fig. 1 is the utility model circuit structure schematic diagram.
Embodiment
referring to Fig. 1, a kind of dynamic constant-current circuit, include a plurality of LEDs 1, LED2 ~ LEDn, switch triode Q1, amplify diode Q2, with logical circuit Y1, current sense resistor R1 and driving biasing resistor R2, a plurality of light-emitting diode pipe LED1, after LED2 ~ LEDn is in series by wire, be connected with DC power supply Vcc on the one hand, collector electrode with switch triode Q1 is connected on the other hand, draw wire and the rear ground connection of series current detection resistance R 1 from the emitter of switch triode Q1, draw wire and be connected with output with logical circuit Y1 from the base stage of switch triode Q1, driving biasing resistor R2 is connected in parallel between the base stage and collector electrode of switch triode Q1, from drawing wire with the input of logical circuit Y1 and being connected with reference power supply Ver, from drawing wire with another input of logical circuit Y1 and being connected with the collector electrode of amplifying triode Q2, draw wire and be connected with the emitter of switch triode Q1 from the base stage of amplifying triode Q2, drawing ground connection after wire from the emitter of amplifying triode Q2.
In the utility model, in a plurality of LEDs 1, LED2 ~ LEDn, the anode of LED 1 is connected with DC power supply Vcc by wire, and the negative electrode of LED n is connected by the collector electrode of wire with switch triode Q1.
a plurality of LEDs 1, the electric current of LED2 ~ LEDn flows into the collector electrode of switch triode Q1 through negative electrode, provide bias current owing to driving the base stage of biasing resistor R2 to switch triode Q1, make conducting between the collector electrode of switch triode Q1 and emitter, and there is the electric current current flowing to detect resistance R 1, the constant current set point is set by current sense resistor R1, formula is Vbe=I * R1, when the electric current of current flowing detection resistance R 1 reaches the Vbe value, the base stage of amplifying triode Q2 obtains bias voltage and amplifies conducting, make with the input level of logical circuit Y1 and be " 0 ", with logical circuit Y1 after logic and operation rapidly output low level to the base stage of switch triode Q1, make switch triode Q1 base stage lose bias voltage and the closure set electrode current, if a plurality of LEDs 1, LED2 ~ LEDn cut-off, be that no current flows through, current sense resistor R1 does not have electric current to flow through yet, the value of Vbe is " 0 ", amplifying triode Q2 base stage loses bias voltage and makes the collector terminal voltage recovery, make with the input level of logical circuit Y1 and be " 1 ", export rapidly high level with logical circuit Y1 to the base stage of switch triode Q1 after logic and operation, make the base stage of switch triode Q1 obtain bias current, make conducting again between the collector electrode of switch triode Q1 and emitter, there is this moment the electric current current flowing to detect resistance R 1, make a plurality of LEDs 1, LED2 ~ LEDn has dynamic continuous current to flow through, the continuous periodic duty of said process, make a plurality of LEDs 1, LED2 ~ LEDn is normally shinny in dynamic constant current process.
Because the LED lamp has afterglow effect, and human eye has slow sensation to light, in the moment brightness of LED lamp during dead electricity or stable.The utility model has been given full play to the potential effect of LED lamp and has been reduced the current loss caloric value of LED lamp, and the one side of fully having showed the LED streetlamp energy-saving.
Claims (3)
1. dynamic constant-current circuit, include a plurality of light-emitting diodes, triode Q1, Q2, with logical circuit Y1, current sense resistor R1 and driving biasing resistor R2, it is characterized in that: after described a plurality of light-emitting diodes are in series by wire, be connected with DC power supply Vcc on the one hand, collector electrode with described triode Q1 is connected on the other hand, draw wire and the rear ground connection of series current detection resistance R 1 from the emitter of described triode Q1, draw wire and be connected with output with logical circuit Y1 from the base stage of triode Q1, described driving biasing resistor R2 is connected in parallel between the base stage and collector electrode of triode Q1, draw wire with the input of logical circuit Y1 and be connected with reference power supply Ver from described, from drawing wire with another input of logical circuit Y1 and being connected with the collector electrode of triode Q2, draw wire and be connected with the emitter of triode Q1 from the base stage of described triode Q2, drawing ground connection after wire from the emitter of triode Q2.
2. dynamic constant-current circuit according to claim 1, it is characterized in that: in described a plurality of light-emitting diodes, the anode of first light-emitting diode is connected with DC power supply Vcc by wire, and the negative electrode of last light-emitting diode is connected by the collector electrode of wire with described triode Q1.
3. dynamic constant-current circuit according to claim 1, it is characterized in that: described triode Q1 is switch triode, described triode Q2 is amplifying triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320276473 CN203279286U (en) | 2013-05-20 | 2013-05-20 | Dynamic constant current circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320276473 CN203279286U (en) | 2013-05-20 | 2013-05-20 | Dynamic constant current circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203279286U true CN203279286U (en) | 2013-11-06 |
Family
ID=49509602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320276473 Expired - Fee Related CN203279286U (en) | 2013-05-20 | 2013-05-20 | Dynamic constant current circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203279286U (en) |
-
2013
- 2013-05-20 CN CN 201320276473 patent/CN203279286U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20131106 Termination date: 20140520 |