CN209497637U - A kind of constant-current LED lamp group driving circuit - Google Patents
A kind of constant-current LED lamp group driving circuit Download PDFInfo
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- CN209497637U CN209497637U CN201821836561.5U CN201821836561U CN209497637U CN 209497637 U CN209497637 U CN 209497637U CN 201821836561 U CN201821836561 U CN 201821836561U CN 209497637 U CN209497637 U CN 209497637U
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Abstract
The utility model provides a kind of constant-current LED lamp group driving circuit, including the first LED light group, second LED light group, triode Q1 and triode Q2, first LED light group and the second LED light group are composed in series by several LED, it is identical with the LED specification of group, the VF value of first LED light group is less than or equal to the VF value of the second LED light group, the IF value of first LED light group is equal to the IF value of the second LED light group, the triode Q1 and triode Q2 is the identical NPN triode of specification, the anode of the LED light group is connected in parallel on positive pole, the collector and base stage of the cathode connection triode Q1 of first LED light group, the base stage of the base stage connecting triode Q2 of the triode Q1, the cathode connected to the transistor Q2 of second LED light group Collector, the emitter of the triode Q1 and triode Q2 is connected in parallel on power cathode.The mode that the utility model is connected using triode mirror image ensure that the current value of the second lamp group is determined by the first LED light group, and the LED light group of driving multiple groups difference VF value may be implemented.
Description
Technical field
The utility model relates to illuminate actuation techniques field more particularly to a kind of constant-current LED lamp group driving circuit.
Background technique
LED's in use, mostly using the identical LED of IF value, but drive band carry LED quantity it is more when, cannot be complete by LED
LED can only often be gone here and there and be used in mixed way to reduce cost by portion's use that is together in series, but since the VF value of different LED has
Difference, if by LED it is series-parallel after be directly connected to driving output use, will cause different paths of LEDs load currents and differ greatly,
LED stability itself and lamps and lanterns colour rendering are all deteriorated, since the brightness value of LED is directly proportional to by the electric current of LED, in order to guarantee
The brightness of each LED, colour temperature consistency, must make it is as consistent as possible by the size of LED current, the prior art often through
Independent multiple constant-current supply module drives drive multiple groups LED light, this method higher cost and are unfavorable for extending.
The utility model of publication number CN206650873U discloses a kind of multiple-channel output LED drive power, including hands over outside
AC-DC conversion module, control circuit module, the first constant-current driven module and the second constant-current driven module of galvanic electricity connection, are handed over
DC conversion modules further include the first DC power-supply circuit and the second DC power-supply circuit, the first DC power-supply circuit point
It is not connect with the first constant-current driven module and the second constant-current driven module, the second DC power-supply circuit has and control circuit module
First output end of connection and the second output terminal being connect for the motor with rotary LED lamp.
The utility model of publication number CN207099372U discloses a kind of colour temperature chip for detecting LED switch on wall, chip
It inside include that power management module, chip logic control module, filtering and detection of power loss module, drive module, chip are also set up
(N+4) organize pin, including VDD pin, CAP pin, GND pin, CS pin and N number of driving output pin D1, D2, D3 ... Dn,
Portion by PMOS tube back to back structure is connected to CAP pin to VDD pin in the chip, and N number of output end of drive module connects core
N number of driving output pin D1, D2 of piece, D3 ... Dn.
In above-mentioned documents, multiple groups LED light is needed using multiple groups driving circuit, and a driving circuit is unable to drive difference
The LED of VF value, so higher cost, is unfavorable for extending.
Utility model content
Aiming at the problem that traditional LED drive circuit can not drive the LED light group of multiple groups difference VF value simultaneously, the utility model
A kind of constant-current LED lamp group driving circuit is provided, the LED light group of multiple groups difference VF value can be driven simultaneously, cost is reduced, be conducive to
Extension.
It is the technical solution of the utility model below.
A kind of constant-current LED lamp group driving circuit, including the first LED light group, the second LED light group, triode Q1 and triode
Q2, first LED light group and the second LED light group are composed in series by several LED, identical with the LED specification of group, and first
The VF value of LED light group is less than or equal to the VF value of the second LED light group, and the IF value of the first LED light group is equal to the IF of the second LED light group
Value, the triode Q1 and triode Q2 are the identical NPN triode of specification, and the anode of the LED light group is being connected in parallel on power supply just
Pole, the collector and base stage of the cathode connection triode Q1 of first LED light group, the base stage of the triode Q1 connect three poles
The base stage of pipe Q2, the collector of the cathode connected to the transistor Q2 of second LED light group, the triode Q1 and triode Q2's
Emitter is connected in parallel on power cathode.The IF value of general LED is all the same, but VF value really differs bigger, more in LED quantity
When, if directly connected, the supply voltage needed is with regard to bigger raising cost, and parallel connection will lead to the electric current of each LED light not
Together, illumination effect is caused difference occur, so the form of series connection adduction connection is optimal solution, the technical program uses triode mirror image
The mode of connection ensure that the current value of the second lamp group is determined by the first LED light group, the electric current of two groups of LED light groups may be implemented
It is essentially identical, that is, realize the LED light group that a driving drives multiple groups difference VF value.
Preferably, further including several additional LED lamp groups and additional triode, the additional LED lamp group is identical by specification
LED be composed in series, the VF value of additional LED lamp group is more than or equal to the VF value of the first LED light group, the additional triode specification with
Triode Q1 is consistent, the connection type of every group of additional LED lamp group and its corresponding additional triode and the second LED light group and
The connection type of triode Q2 is consistent.The utility model can be completed within the scope of route bearing capacity with one-to-multiple form more
The driving of group LED light group is especially advantageous for extension and cost is relatively low.
Preferably, the model 2SD882 of the triode.The model is more mature reliable triode model.
Preferably, the LED quantity in every group of LED light group is identical.
The utility model has the following beneficial effects: multiple groups IF value can be driven identical simultaneously, but the LED light group that VF value is different,
Cost is relatively low, is conducive to extend.
Detailed description of the invention
It is as shown in Figure 1 a kind of circuit diagram of the utility model.
Specific embodiment
The technical program is further elaborated below in conjunction with Figure of description.
Embodiment 1: being as shown in Figure 1 a kind of constant-current LED lamp group driving circuit, including the first LED light group, the second LED light
Group, triode Q1 and triode Q2, first LED light group and the second LED light group are composed in series by several LED, and same group
LED specification it is identical, less than the VF value of the second LED light group, the IF value of the first LED light group is equal to for the VF value of the first LED light group
The IF value of two LED light groups, the triode Q1 and triode Q2 are the identical NPN triode of specification, the anode of the LED light group
It is connected in parallel on positive pole, the cathode of first LED light group connects the collector and base stage of triode Q1, the triode Q1's
The base stage of base stage connecting triode Q2, the collector of the cathode connected to the transistor Q2 of second LED light group, the triode Q1
And the emitter of triode Q2 is connected in parallel on power cathode.The IF value of LED is all the same under normal circumstances, but VF value really differs and compares
Greatly, when LED quantity is more, if directly connected, the supply voltage needed is with regard to bigger raising cost, and parallel connection will lead to often
The electric current of a LED light is different, and illumination effect is caused difference occur, so the form of series connection adduction connection is optimal solution, the present embodiment
The mode connected using triode mirror image ensure that the current value of the second lamp group is determined by the first LED light group, may be implemented two groups
The electric current of LED light group is essentially identical, that is, realizes the LED light group that a driving drives multiple groups difference VF value.
In the present embodiment, the model 2SD882 of the triode.The model is more mature reliable triode model.
In the present embodiment, it is 5 that the LED quantity in every group of LED light group is identical.
Embodiment 2: the present embodiment the difference from embodiment 1 is that, increase one group of additional LED lamp group and additional three poles
Pipe, the additional LED lamp group are composed in series by the identical LED of specification, and the VF value of additional LED lamp group is greater than the first LED light group
VF value, the additional triode specification is consistent with triode Q1, the connection type of the additional LED lamp group and additional triode with
Second LED light group and the connection type of triode Q2 are consistent.
The present embodiment can complete the driving of multiple groups LED light group within the scope of route bearing capacity with one-to-multiple form,
It is especially advantageous for extension and cost is relatively low.
It should be noted that the specific embodiment is only used for that technical solution is further described, it is not used in and limits the skill
The range of art scheme, any modifications, equivalent substitutions and improvements etc. based on this technical solution are regarded as in the utility model
In protection scope.
Claims (4)
1. a kind of constant-current LED lamp group driving circuit, which is characterized in that including the first LED light group, the second LED light group, triode Q1
And triode Q2, first LED light group and the second LED light group are composed in series by several LED, with the LED specification phase of group
Together, the VF value of the first LED light group is less than or equal to the VF value of the second LED light group, and the IF value of the first LED light group is equal to the second LED light
The IF value of group, the triode Q1 and triode Q2 are the identical NPN triode of specification, and the anode of the LED light group is connected in parallel on
Positive pole, the collector and base stage of the cathode connection triode Q1 of first LED light group, the base stage of the triode Q1 connect
Connect the base stage of triode Q2, the collector of the cathode connected to the transistor Q2 of second LED light group, the triode Q1 and three poles
The emitter of pipe Q2 is connected in parallel on power cathode.
2. a kind of constant-current LED lamp group driving circuit according to claim 1, which is characterized in that further include several additional LEDs
Lamp group and additional triode, the additional LED lamp group are composed in series by the identical LED of specification, and the VF value of additional LED lamp group is greater than
Equal to the VF value of the first LED light group, the additional triode specification is consistent with triode Q1, every group of additional LED lamp group and
The connection type of its corresponding additional triode is consistent with the connection type of the second LED light group and triode Q2.
3. a kind of constant-current LED lamp group driving circuit according to claim 1 or 2, which is characterized in that the type of the triode
Number be 2SD882.
4. a kind of constant-current LED lamp group driving circuit according to claim 1 or 2, which is characterized in that every group of LED light
LED quantity in group is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821836561.5U CN209497637U (en) | 2018-11-08 | 2018-11-08 | A kind of constant-current LED lamp group driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821836561.5U CN209497637U (en) | 2018-11-08 | 2018-11-08 | A kind of constant-current LED lamp group driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209497637U true CN209497637U (en) | 2019-10-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821836561.5U Active CN209497637U (en) | 2018-11-08 | 2018-11-08 | A kind of constant-current LED lamp group driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209497637U (en) |
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2018
- 2018-11-08 CN CN201821836561.5U patent/CN209497637U/en active Active
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