CN202799323U - Light-emitting diode (LED) BOOST constant current circuit - Google Patents
Light-emitting diode (LED) BOOST constant current circuit Download PDFInfo
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- CN202799323U CN202799323U CN 201220494550 CN201220494550U CN202799323U CN 202799323 U CN202799323 U CN 202799323U CN 201220494550 CN201220494550 CN 201220494550 CN 201220494550 U CN201220494550 U CN 201220494550U CN 202799323 U CN202799323 U CN 202799323U
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Abstract
The utility model relates to the field of light-emitting diode (LED) circuit, in particular to an LED BOOST constant current circuit. The LED BOOST constant current circuit comprises a BOOST circuit module which is respectively connected with the voltage input end and the LED voltage output end, the BOOST circuit module comprises a constant-current control chip, the LED output voltage comprises an LED output positive pole and an LED output negative pole, the LED BOOST constant current circuit further comprises an open-circuit voltage sampling monitoring module for collecting the LED output voltage, the collecting end of the open-circuit voltage sampling monitoring module is connected with the positive voltage output end of the BOOST circuit module and an LED output positive pole, and the control end of the open-circuit voltage sampling monitoring module is connected with an overcurrent protection end of the constant-current control chip. The open-circuit voltage sampling monitoring module can monitor output voltage of an LED, and protection functions of the constant-current control chip can be started when sampled voltage exceeds protection points of the overcurrent protection end of the constant-current control chip.
Description
Technical field
The utility model relates to the led circuit field, relates in particular to a kind of LED BOOST voltage increase and current constant circuit.
Background technology
The voltage increase and current constant of LED is taked the BOOST booster circuit mostly at present; and the undersized constant current circuit control IC of available technology adopting generally adopts the SOT-26 encapsulation; the PIN pin of IC is limited; do not possess open circuit protecting function; in application; because the LED output voltage is not detected; the LED output voltage can't be fed back to control IC; if LED voltage constantly raises until the situation of LED open fault occurs; if there is not protective circuit, the circuit of this booster type will boost always and damage until inner switching tube and diode constant power device are breakdown.
Summary of the invention
The purpose of this utility model is to overcome shortcoming and defect of the prior art, and a kind of LED BOOST voltage increase and current constant circuit with open circuit protecting function is provided.
To achieve these goals; the utility model adopts following technical scheme: a kind of LED BOOST voltage increase and current constant circuit; comprise the BOOST circuit module; the BOOST circuit module is connected with the LED voltage output end with voltage input end respectively; described BOOST circuit module comprises the constant current control chip; described LED output voltage comprises LED output cathode and LED output negative pole; LED BOOST voltage increase and current constant circuit also comprises for the open circuit voltage sampling monitoring module that gathers the LED output voltage; the collection terminal of open circuit voltage sampling monitoring module connects malleation output and the LED output cathode of BOOST circuit module, and the control end of open circuit voltage sampling monitoring module connects the overcurrent protection end of constant current control chip.
Wherein, described open circuit voltage sampling monitoring module comprises resistance R 1, R2, R3, capacitor C 1, voltage-stabiliser tube Z1; The end of R1 is connected with the malleation output of BOOST circuit module, LED output cathode; the other end of R1 is connected with the end of R2; the end of the other end of R2, R3, the end of C1 all are connected with the negative electrode of Z1; the other end of R3, the other end of C1 are connected with the earth terminal of constant current control chip, and the anode of Z1 is connected with the overcurrent protection end of constant current control chip.
Wherein, described BOOST circuit module also comprises inductance L 1, switching tube Q1, diode D3, capacitor C 3, electric capacity EC1, resistance R 9, R10; The end of L1 is connected with voltage input end, the other end of L1 is connected with the positive pole of the drain electrode of Q1, D3, the end of the negative pole of D3, C3 is connected with electric capacity EC1 and anodal all is connected with the LED output cathode, the source electrode of Q1 is connected an end with R9 respectively and is connected with R10, R9 is connected the other end of the other end, C3, the negative pole of electric capacity EC1 and is connected with the earth terminal of constant current control chip with R10, the grid of Q1 is connected with the drive output of constant current control chip.
Wherein, described BOOST circuit module also comprises resistance R 7 and capacitor C 2, and the end of R7 connects the source electrode of Q1, and the end of C2 connects the earth terminal of constant current control chip, and the other end of R7 is connected the other end and is all connected the overcurrent protection end of constant current control chip with C2.
Wherein, described BOOST circuit module also comprises diode D1, and the positive pole of D1 connects LED output negative pole, the minus earth of D1.
Wherein, described constant current control chip is the BIT3260 chip.
Wherein, described R1, R2 and R3 are the resistance of resistance 39K Ω, and C1 is the electric capacity of appearance value 100uF, and Z1 is the voltage-stabiliser tube of 24V.
Wherein, described R9 and R10 are the resistance of resistance 39K Ω.
Wherein, described R7 is the resistance of resistance 1K Ω.
Wherein, described D1 is the RL207 diode.
The beneficial effects of the utility model are: the utility model is by the voltage of the output of open circuit voltage sampling monitoring module monitors LED; when the voltage of sampling surpasses the protection point of constant current control chip overcurrent protection end; constant current control chip defencive function starts, thereby utilizes cleverly the overcurrent protection end to realize open circuit protecting function.
Description of drawings
Fig. 1 is circuit diagram of the present utility model.
Fig. 1 comprises the following drawings mark:
BOOST circuit module-1; Open circuit voltage sampling monitoring module-2.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in detail.
With reference to figure 1; the utility model comprises the BOOST circuit module; the BOOST circuit module is connected with voltage input end namely in order to connect Vin respectively) be connected with the LED voltage output end; described BOOST circuit module comprises the constant current control chip; described LED output voltage comprises LED output cathode and LED output negative pole; LED BOOST voltage increase and current constant circuit also comprises for the open circuit voltage sampling monitoring module 2 that gathers the LED output voltage; the collection terminal of open circuit voltage sampling monitoring module 2 connects malleation output and the LED output cathode of BOOST circuit module 1, and the control end of open circuit voltage sampling monitoring module 2 connects the overcurrent protection end of constant current control chip.
Open circuit voltage sampling monitoring module 2 comprises resistance R 1, R2, R3, capacitor C 1, voltage-stabiliser tube Z1; The end of R1 is connected with the malleation output of BOOST circuit module, LED output cathode; the other end of R1 is connected with the end of R2; the end of the other end of R2, R3, the end of C1 all are connected with the negative electrode of Z1; the other end of R3, the other end of C1 are connected with the earth terminal of constant current control chip, and the anode of Z1 is connected with the overcurrent protection end of constant current control chip.
Also comprise diode D1, the positive pole of D1 connects LED output negative pole, the minus earth of D1.
The utility model comprises the open circuit voltage sampling monitoring module 2 that connects BOOST circuit module 1 and LED output cathode; can monitor the output voltage of LED by open circuit voltage sampling monitoring module 2; when the voltage of sampling surpasses the protection point of constant current control chip overcurrent protection end; constant current control chip defencive function starts, thereby utilizes cleverly the overcurrent protection end to realize open circuit protecting function.Suppose that overcurrent protection end protection point is VP, then the value of constant current control chip open-circuit-protection voltage Vout can be calculated by following formula:
Vout=(Vz1+VP)*(Vr1+Vr2+Vr3)/Vr3。
In the present embodiment, BOOST circuit module 1 and open circuit voltage sampling monitoring module 2 adopts above-mentioned execution mode, and except this execution mode, the utility model also can use other components and parts with identical function and other execution modes of connected mode.
In the present embodiment, as preferred embodiment, the constant current control chip is the BIT3260 chip, and the constant current control chip also can adopt other with the chip of overcurrent protection end certainly.R1, R2 and R3 are the resistance of resistance 39K Ω, and C1 is the electric capacity of appearance value 100uF, and Z1 is the voltage-stabiliser tube of 24V.R9 and R10 are that resistance is the resistance of 39K Ω.R7 is that resistance is the resistance of 1K Ω.D1 is the RL207 diode.Certainly, those of ordinary skill in the art for satisfying practical application request, according to common practise and limited experiment, can adjust above-mentioned components and parts and parameter value.
Above content only is preferred embodiment of the present utility model, for those of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, this description should not be construed as restriction of the present utility model.
Claims (10)
1. LED BOOST voltage increase and current constant circuit; comprise the BOOST circuit module; the BOOST circuit module is connected with the LED voltage output end with voltage input end respectively; described BOOST circuit module comprises the constant current control chip; described LED output voltage comprises LED output cathode and LED output negative pole; it is characterized in that: LED BOOST voltage increase and current constant circuit also comprises for the open circuit voltage sampling monitoring module that gathers the LED output voltage; the collection terminal of open circuit voltage sampling monitoring module connects malleation output and the LED output cathode of BOOST circuit module, and the control end of open circuit voltage sampling monitoring module connects the overcurrent protection end of constant current control chip.
2. a kind of LED BOOST voltage increase and current constant circuit according to claim 1, it is characterized in that: described open circuit voltage sampling monitoring module comprises resistance R 1, R2, R3, capacitor C 1, voltage-stabiliser tube Z1; One end of resistance R 1 is connected with the malleation output of BOOST circuit module, LED output cathode; the other end of resistance R 1 is connected with an end of resistance R 2; one end of the other end of resistance R 2, resistance R 3, an end of capacitor C 1 all are connected with the negative electrode of voltage-stabiliser tube Z1; the other end of the other end of resistance R 3, capacitor C 1 is connected with the earth terminal of constant current control chip, and the anode of voltage-stabiliser tube Z1 is connected with the overcurrent protection end of constant current control chip.
3. a kind of LED BOOST voltage increase and current constant circuit according to claim 1, it is characterized in that: described BOOST circuit module also comprises inductance L 1, switching tube Q1, diode D3, capacitor C 3, electric capacity EC1, resistance R 9, R10; One end of inductance L 1 is connected with voltage input end, the other end of inductance L 1 is connected with the drain electrode of switching tube Q1, the positive pole of diode D3, one end of the negative pole of diode D3, capacitor C 3 is connected with electric capacity EC1 and anodal all is connected with the LED output cathode, the source electrode of switching tube Q1 is connected an end with resistance R 9 respectively and is connected with R10, resistance R 9 is connected the other end of the other end, capacitor C 3, the negative pole of electric capacity EC1 and is connected with the earth terminal of constant current control chip with R10, the grid of switching tube Q1 is connected with the drive output of constant current control chip.
4. a kind of LED BOOST voltage increase and current constant circuit according to claim 3; it is characterized in that: described BOOST circuit module also comprises resistance R 7 and capacitor C 2; the source electrode of one end connecting valve pipe Q1 of resistance R 7; one end of capacitor C 2 connects the earth terminal of constant current control chip, and the other end that the other end of resistance R 7 is connected with capacitor C all connects the overcurrent protection end of constant current control chip.
5. a kind of LED BOOST voltage increase and current constant circuit according to claim 4, it is characterized in that: described BOOST circuit module also comprises diode D1, the positive pole of diode D1 connects LED output negative pole, the minus earth of diode D1.
6. a kind of LED BOOST voltage increase and current constant circuit according to claim 1, it is characterized in that: described constant current control chip is the BIT3260 chip.
7. a kind of LED BOOST voltage increase and current constant circuit according to claim 2, it is characterized in that: described resistance R 1, R2 and R3 are the resistance of resistance 39K Ω, and capacitor C 1 is the electric capacity of appearance value 100uF, and voltage-stabiliser tube Z1 is the voltage-stabiliser tube of 24V.
8. a kind of LED BOOST voltage increase and current constant circuit according to claim 3, it is characterized in that: described resistance R 9 and R10 are the resistance of resistance 39K Ω.
9. a kind of LED BOOST voltage increase and current constant circuit according to claim 4, it is characterized in that: described resistance R 7 is the resistance of resistance 1K Ω.
10. a kind of LED BOOST voltage increase and current constant circuit according to claim 5, it is characterized in that: described diode D1 is the RL207 diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220494550 CN202799323U (en) | 2012-09-26 | 2012-09-26 | Light-emitting diode (LED) BOOST constant current circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220494550 CN202799323U (en) | 2012-09-26 | 2012-09-26 | Light-emitting diode (LED) BOOST constant current circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202799323U true CN202799323U (en) | 2013-03-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220494550 Expired - Fee Related CN202799323U (en) | 2012-09-26 | 2012-09-26 | Light-emitting diode (LED) BOOST constant current circuit |
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| Country | Link |
|---|---|
| CN (1) | CN202799323U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104426367A (en) * | 2013-08-20 | 2015-03-18 | 硕颉科技股份有限公司 | Boost apparatus with over-current and over-voltage protection function |
| CN112689358A (en) * | 2020-12-30 | 2021-04-20 | 浙江凯耀照明有限责任公司 | BOOST constant current circuit with no-load protection |
-
2012
- 2012-09-26 CN CN 201220494550 patent/CN202799323U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104426367A (en) * | 2013-08-20 | 2015-03-18 | 硕颉科技股份有限公司 | Boost apparatus with over-current and over-voltage protection function |
| CN112689358A (en) * | 2020-12-30 | 2021-04-20 | 浙江凯耀照明有限责任公司 | BOOST constant current circuit with no-load protection |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 Termination date: 20200926 |