CN203136289U - Novel constant current output control circuit - Google Patents
Novel constant current output control circuit Download PDFInfo
- Publication number
- CN203136289U CN203136289U CN 201320157589 CN201320157589U CN203136289U CN 203136289 U CN203136289 U CN 203136289U CN 201320157589 CN201320157589 CN 201320157589 CN 201320157589 U CN201320157589 U CN 201320157589U CN 203136289 U CN203136289 U CN 203136289U
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- circuit
- constant current
- reference voltage
- output control
- novel constant
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Abstract
The utility model discloses a novel constant current output control circuit, which can be divided into five parts, namely a reference voltage generation circuit, a reference voltage connecting circuit, a current sampling circuit, a comparator circuit, and a control signal output circuit. The utility model is characterized in that (1) the reference voltage generation circuit comprises a resistor R58, a U10, and capacitors C48 and C49; (2) the reference voltage connecting circuit comprises two resistors (R79,R97), a capacitor C50, and a second pin of a connecting comparator U8-A; (3) the current sampling circuit comprises a third pin of an RS C30 connecting comparison circuit; (4) the comparator circuit comprises a U8-A, two capacitors (C46, C47), and a resistor R56, and can be used for the gradient compensation; (5) the control signal output circuit comprises a diode D27, two resistors (R55, R92), and a capacitor C34, and a U7. The novel constant current output control circuit is advantageous in that the driving reliability and the driving stability of the LED can be improved; and the index requirement of the LED lamp bead on the anti-instant impact current can be reduced.
Description
Technical field
Electronic applications, be specifically related to the LED power driving circuit and have the circuit of constant current.
Background technology
LED has slowly replaced incandescent lamp as the novel energy of low energy consumption, high life, environmental protection, obtains consumers in general's approval.Yet along with the LED development of technology, some problems of itself also progressively are found.Particularly LED drives some problems that exist and directly affects LED lamp luminous mass; Therefore the solution of a LED Driving technique difficult problem could provide reliable guarantee for LED exploits market.And a main cause that influences the luminous quality of LED lamp can be exactly LED drive electric current stably is provided; Particularly can LED drive stable electric current is provided when start, will directly have influence on the life-span of driving and LED lamp.In traditional LED driving power circuit, when usually having start, output current moment can occur and overcharge problem; This problem is perplexing the reliability that LED drives always, and then has influence on the luminous of LED lamp.Therefore LED lamp pearl may suffer damage when instantaneous large-current occurs; Therefore in traditional circuit, the existence that moment overcharges problem during start directly has influence on the life-span of the stable and LED of LED.
The utility model content
For solving above-mentioned technological deficiency, the utility model provides a kind of novel constant current output control circuit.
The purpose of this utility model is to be achieved through the following technical solutions:
A kind of novel constant current output control circuit comprises: reference voltage forms circuit, reference voltage place in circuit, current sampling circuit, comparator circuit, control signal circuit.
Wherein, benchmark forms circuit, comprising: resistance R 58, U10, capacitor C 48, C49.
Wherein, the reference voltage place in circuit comprises: two resistance (R79, R97), capacitor C 50, the 2pin of access comparator U8-A.
Wherein, current sampling circuit comprises: RS C30 inserts the 3pin of comparison circuit U8-A.
Wherein, comparator circuit comprises: U8-A, two electric capacity (C46, C47), resistance R 56, and as the compensation of slope.
Wherein, the control signal circuit comprises: diode D27, two resistance (R55, R92), capacitor C 34, U7.
The utility model beneficial effect compared with prior art is:
(1) the utility model output current moment when improving start overcharges problem, reduce the risk that the LED light fixture that joins is with it impacted by instantaneous large-current, improve reliability, stability that LED drives, reduced the index request of the anti-moment impact electric current of LED lamp pearl.
(2) the utility model increases resistance R 97 capacitor C 50 on traditional constant-current control circuit basis, suppresses the output current overshoot thereby reach.
Description of drawings
Fig. 1 is constant current output control circuit figure of the present utility model.
Embodiment
Below in conjunction with the utility model accompanying drawing, the technical scheme among the utility model embodiment is carried out clear, complete description, obviously, described embodiment only is a part of embodiment of the present utility model, rather than whole embodiment.Based on embodiment of the present utility model, those skilled in the art belong to protection range of the present utility model not making the every other embodiment that obtains under the creative work prerequisite.
As Fig. 1, characteristics of the present utility model are: the utility model circuit is on traditional constant-current control circuit basis, increases resistance R 97 capacitor C 50, by postponing the new-type circuit that traditional constant current (comparator) circuit reference voltage rises to preset value; It is 5 parts that entire circuit is divided into, 1) and reference voltage formation circuit, it comprises: resistance R 58, U10, capacitor C 48, C49; 2) reference voltage place in circuit, it comprises: (two resistance (R79, R97), capacitor C 50, the 2pin of access comparator U8-A; 3) current sampling circuit, it comprises: RS C30 inserts the 3pin of comparison circuit U8-A; 4) comparator circuit, it comprises: U8-A, two electric capacity (C46, C47), resistance R 56, as the compensation of slope; 5) control signal output circuit, it comprises: diode D27, two resistance (R55, R92), capacitor C 34, U7.
The characteristics of the utility model circuit are: the utility model circuit is on traditional constant-current control circuit basis, increases resistance R 9 and capacitor C 50.After R97 and the C50 series connection, be connected to the reference voltage end of constant-current circuit, the C50 both end voltage is approximately 0V before powering on, the lower end of R97 is similar to ground connection, and this moment, reference voltage was determined by R79 and R97 dividing potential drop, along with the charging of electric capacity is finished, the approximate open circuit in R97 lower end, this moment, voltage was equal to the preceding terminal voltage of R79.Change R97 and C50 parameter and can adjust the ascending curve of reference voltage; This circuit is superimposed upon on the basis of traditional comparison circuit and (carries out voltage signal relatively for the 2pin of amplifier and 3pin on the figure, produce control signal at 1pin, U7 feeds back to front-end control by photoelectrical coupler, regulate the output current of duty ratio control complete machine), capacitor C 50 charge characteristics that utilization is added, when start, form the reference voltage of constant-current circuit by the low rising situation that rises to preset value, thereby make LED drive the Constant Electric Current flow valuve of output; And then reach the purpose that output current when preventing from starting shooting moment overcharges.
Claims (6)
1. a novel constant current output control circuit is characterized in that it comprises, reference voltage forms circuit, reference voltage place in circuit, current sampling circuit, comparator circuit, control signal output circuit.
2. as described in the right 1, a kind of novel constant current output control circuit, described benchmark forms circuit, comprises resistance R 58, U10, capacitor C 48, C49.
3. as described in as right 1, a kind of novel constant current output control circuit, described reference voltage place in circuit comprises, two resistance (R79, R97), capacitor C 50 insert the 2pin of comparator U8-A.
4. as described in as right 1, a kind of novel constant current output control circuit, described current sampling circuit comprises, RS C30 inserts the 3pin of comparison circuit U8-A.
5. as described in as right 1, a kind of novel constant current output control circuit, described comparator circuit comprises, U8-A, two electric capacity (C46, C47), resistance R 56 are as the compensation of slope.
6. as described in as right 1, a kind of novel constant current output control circuit, described control signal output circuit comprises, D27, two resistance (R55, R92), capacitor C 34, U7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320157589 CN203136289U (en) | 2013-03-29 | 2013-03-29 | Novel constant current output control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320157589 CN203136289U (en) | 2013-03-29 | 2013-03-29 | Novel constant current output control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203136289U true CN203136289U (en) | 2013-08-14 |
Family
ID=48944219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320157589 Expired - Lifetime CN203136289U (en) | 2013-03-29 | 2013-03-29 | Novel constant current output control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203136289U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114423114A (en) * | 2021-12-28 | 2022-04-29 | 深圳市崧盛电子股份有限公司 | Drive control circuit and drive power supply for restraining output overshoot |
-
2013
- 2013-03-29 CN CN 201320157589 patent/CN203136289U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114423114A (en) * | 2021-12-28 | 2022-04-29 | 深圳市崧盛电子股份有限公司 | Drive control circuit and drive power supply for restraining output overshoot |
| CN114423114B (en) * | 2021-12-28 | 2024-03-15 | 深圳市崧盛电子股份有限公司 | Drive control circuit and drive power supply for inhibiting output overshoot |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130814 |
|
| CX01 | Expiry of patent term |