CN204090252U - Intelligent power control circuit - Google Patents
Intelligent power control circuit Download PDFInfo
- Publication number
- CN204090252U CN204090252U CN201420583926.3U CN201420583926U CN204090252U CN 204090252 U CN204090252 U CN 204090252U CN 201420583926 U CN201420583926 U CN 201420583926U CN 204090252 U CN204090252 U CN 204090252U
- Authority
- CN
- China
- Prior art keywords
- power control
- resistance
- control module
- input
- control circuit
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The utility model relates to intelligent power control circuit, comprising voltage sample module, power control module and constant-current control module; The described input of voltage sample module is connected with the first end of power tube, the output of described voltage sample module is connected with the input of described power control module, the output of described power control module is connected with the input of described constant-current control module, the output of described constant-current control module is connected with the 3rd end of described power tube, described voltage sampling circuit adopts resistance sampling circuit, described power control module adopts current mirror circuit, and described constant-current control module adopts computing comparison circuit.Adopt intelligent power control circuit of the present utility model, detect the size of input voltage when power tube is started working, reduce the power consumption of driver, the temperature rise of power-limiting pipe, thus reduce the heat radiation cost of driver and LED, structure is simple, has wide range of applications.
Description
Technical field
The utility model relates to electronic technology field, particularly relates to circuit design, specifically refers to a kind of intelligent power control circuit.
Background technology
In LED drive circuit, the current ratio flowing through power tube is larger, the voltage being added in power tube two ends raises with the rising of input voltage, the heating of power tube can be obvious, the heat-sinking capability of power tube itself is limited, the temperature of power tube can constantly raise, the power too high life-span that also can reduce LED, therefore common linear constant current drive circuit input voltage can not be very high, relatively be difficult to meet be similar to the demand of India Market to 300V high input voltage, in addition, linear constant current drives lower in wider input voltage range internal linear regulation.
Refer to shown in Fig. 1, be prior art neutral line constant current LED drive circuit, wherein, VIN is AC-input voltage V
aCby the half-wave voltage signal after rectification, VIN>V
tHtime, the electric current that power tube flows through increases gradually, eventually through amplifier, R
cSwith power tube composition feedback control loop by current stabilization, I
lED=VREF/R
cS.The electric current flowing through power tube has tens mA, and two ends pressure drop input voltage raises and raises, and power tube heating is more serious.
In order to solve power tube heating problem, existing scheme is as follows:
Scheme 1: thermal-shutdown circuit, when detecting that the temperature of power tube is greater than certain value, chip enters guard mode, and power tube turns off, and again opens work after temperature lowers;
Scheme 2: intelligent temperature control circuit, when temperature is elevated to certain value along with the rising of power tube temperature, constantly reduces drive current and reduces temperature rise.
All that after temperature raises, take measure reduces power tube temperature rise again for two kinds of common at present solutions of power tube heating.
Referring to shown in Fig. 2, is the oscillogram of prior art neutral line constant current LED drive circuit, and wherein, linear constant current LED drive circuit of the prior art has following a few point defect:
(1) the linear constant current LED drive circuit of prior art, along with the rising of input ac voltage, power tube conducting duty ratio can increase, and LED average electrical fails to be convened for lack of a quorum rising, lower in wider input voltage range internal linear regulation.
(2) input voltage raises, and power tube heating is relatively more serious, and the integrated thermal-shutdown circuit of inside circuit or intelligent temperature control circuit are also difficult to meet this clock of picture India Market inputs high pressure demand to 300V.
(3) thermal-shutdown circuit and these two kinds of methods of intelligent temperature control circuit are all that after temperature raises, take measure reduces chip temperature rise again, can increase heat radiation cost.
Utility model content
The purpose of this utility model is the shortcoming overcoming above-mentioned prior art, provides a kind ofly to reduce LED output current when power control module detects that input voltage is larger, the power, the temperature reducing power tube that reduce power tube, improve line regulation, the intelligent power control circuit that has wide range of applications.
To achieve these goals, intelligent power control circuit of the present utility model has following formation:
This intelligent power control circuit, its main feature is, described circuit comprises voltage sample module, power control module and constant-current control module; The described input of voltage sample module is connected with the first end of power tube, the output of described voltage sample module is connected with the input of described power control module, the output of described power control module is connected with the input of described constant-current control module, and the output of described constant-current control module is connected with the 3rd end of described power tube.
Further, described voltage sample module comprises the first resistance R1 and the second resistance R2, the first end of the second described resistance R2 is connected with the first end of described power tube, second end of the second described resistance R2 is connected with the first end of the first described resistance R1, and second end of the first described resistance R1 is connected to the ground and connects.
Further, described voltage sample module also comprises the first diode D1, and the positive input of the first described diode D1 is connected with second end of the first described resistance R1, and the inverting input of the first described diode D1 is connected to the ground and connects.
Again further, described power control module comprises signal amplification unit, current mirror unit and the 3rd resistance R3, the first end of described signal amplification unit is connected with the output of described voltage sample module, second end of described signal amplification unit is connected with the input of described current mirror unit, the output of described current mirror unit is connected with the first end of the 3rd described resistance R3, and described second end of the 3rd resistance R3 is connected with the second end of described power tube.
Again further, described constant-current control module comprises the first operational amplifier OP1 and the first sampling resistor R
s1the inverting input of the first described operational amplifier OP1 is connected with the first end of the 3rd described resistance R3, the positive input of the first described operational amplifier OP1 is connected with reference voltage V REF, the output of the first described operational amplifier OP1 is connected with the 3rd end of described power tube, the second end of described power tube and the first described sampling resistor R
s1first end be connected, the first described sampling resistor R
s1the second end be connected to the ground and connect.
Again further, described power control module comprises signal amplification unit, constant current source and partial pressure unit, the first end of described signal amplification unit is connected with the output of described voltage sample module, and the second end of described signal amplification unit, the output of constant current source and the input of partial pressure unit are connected.
Again further, described partial pressure unit comprises the 4th resistance R4 and the 5th resistance R5, the output of the described first end of the 4th resistance R4, the second end of described signal amplification unit and constant current source is connected, second end of the 4th described resistance R4 is connected with the first end of the 5th described resistance R5, and second end of the 5th described resistance R5 is connected to the ground and connects.
Again further, described constant-current control circuit comprises the second operational amplifier OP2 and the first sampling resistor R
s2the positive input of the second described operational amplifier OP2 is connected with the output of described partial pressure unit, the described inverting input of the second operational amplifier OP2 is connected with the second end of described power tube, the second end of described power tube and the second described sampling resistor R
s2first end be connected, the second described sampling resistor R
s2the second end be connected to the ground and connect.
Further, described power tube is HF switch.
Have employed the intelligent power control circuit in this utility model, compared with prior art, there is following beneficial effect:
Intelligent power control circuit of the present utility model, power control module, when detecting that input voltage is larger, can initiatively reduce LED output current, reduces the power consumption of driver, thus the temperature rise of power-limiting pipe, reduce the heat radiation cost of driver and LED; Intelligent power control circuit of the present utility model, by the ratio between appropriate design input voltage and reduction electric current, improves line regulation; Intelligent power control circuit of the present utility model, structure is simple, easy to operate, has wide range of applications.
Accompanying drawing explanation
Fig. 1 is the structural representation of linear constant current LED drive circuit of the prior art.
Fig. 2 is the waveform of linear constant current LED drive circuit of the prior art.
Fig. 3 is the structural representation of intelligent power control circuit of the present utility model.
Fig. 4 is the oscillogram of intelligent power control circuit of the present utility model.
Fig. 5 is the first structural representation of intelligent power control circuit of the present utility model.
Fig. 6 is the structural representation of the utility model voltage sample module.
Fig. 7 is the second structural representation of intelligent power control circuit of the present utility model.
Fig. 8 is the structural representation of the intelligent power control circuit in the concrete case study on implementation of the utility model.
Embodiment
In order to more clearly describe technology contents of the present utility model, conduct further description below in conjunction with specific embodiment.
Refer to shown in Fig. 3 to Fig. 4, intelligent power control circuit of the present utility model comprises voltage sample module, power control module and constant-current control module; The described input of voltage sample module is connected with the first end of power tube, the output of described voltage sample module is connected with the input of described power control module, the output of described power control module is connected with the input of described constant-current control module, and the output of described constant-current control module is connected with the 3rd end of described power tube.
Wherein, input voltage V
aCvIN is obtained after distillation filtering obtains half-wave.Voltage VIN inputs in LED, power tube drain terminal voltage V
dbe a half-wave voltage signal, voltage sample module completes voltage V
dsampling after be input to power control module, work as V
dwhen magnitude of voltage is less, the pressure drop on power tube is less, and power consumption is less, and power control module does not work, and constant-current control module controls power tube and exports a constant current value.Work as V
dwhen being greater than certain value, power control module is started working, the input current of power-limiting pipe, flows through the electric current of power tube with V
dincrease and reduce, the pressure drop of such power tube two ends raises, and electric current reduces, and power is limited, thus reduces heating, the input current of power tube and V
dwork wave as shown in Figure 4.
Refer to shown in Fig. 5, for the first implementation of described voltage sample module, wherein said voltage sample module comprises the first resistance R1 and the second resistance R2, the first end of the second described resistance R2 is connected with the first end of described power tube, second end of the second described resistance R2 is connected with the first end of the first described resistance R1, and second end of the first described resistance R1 is connected to the ground and connects.
Refer to shown in Fig. 6, for the second implementation of described voltage sample module, described voltage sample module also comprises the first diode D1, the positive input of the first described diode D1 is connected with second end of the first described resistance R1, and the inverting input of the first described diode D1 is connected to the ground and connects.Like this, voltage sample module adds a diode D1, sampled voltage V1=0.7+R1V
d/ (R1+R2), just can open power control module when VD voltage compare is low.
Shown in Fig. 5, for the first structural representation of intelligent power control circuit of the present utility model, wherein, described voltage sample module can adopt in two kinds of above-mentioned modes any one, the first structure in Figure 5, voltage sampling circuit adopts first kind of way, in addition, described power control module comprises signal amplification unit, current mirror unit and the 3rd resistance R3, the first end of described signal amplification unit is connected with the output of described voltage sample module, second end of described signal amplification unit is connected with the input of described current mirror unit, the output of described current mirror unit is connected with the first end of the 3rd described resistance R3, described second end of the 3rd resistance R3 is connected with the second end of described power tube.
Wherein, signal amplification unit can adopt the wherein one in triode common-base amplification circuit, triode common emitter amplifying circuit, field effect transistor common source amplifying circuit or field effect transistor common drain amplifying circuit, and the current mirror unit of triode or field effect transistor composition in current mirror unit, can be adopted, concrete structure as shown in Figure 5, repeats no more here.
Described constant-current control module comprises the first operational amplifier OP1 and the first sampling resistor R
s1the inverting input of the first described operational amplifier OP1 is connected with the first end of the 3rd described resistance R3, the positive input of the first described operational amplifier OP1 is connected with reference voltage V REF, the output of the first described operational amplifier OP1 is connected with the 3rd end of described power tube, the second end of described power tube and the first described sampling resistor R
s1first end be connected, the first described sampling resistor R
s1the second end be connected to the ground and connect.
The operation principle of the first structure of intelligent power control circuit of the present utility model is:
VDD is the power supply signal that chip internal produces, and voltage sample module is realized by resistance R1, R2 dividing potential drop, when sampled voltage is greater than certain value, and N
1open, during power control module work, sample voltage value demand fulfillment N1 is operated in linear zone, and the electric current of such N1 increases with sample voltage value and increases, and the current mirror mirror image that the electric current of N1 is consisted of P1, P2 flows through R
3, the reverse inter-input-ing voltage of OP1 is V
rS1+ V
r3.OP1 and power tube, R
s1, R3 form feedback control loop, the pressure drop V on R3
draise and raise, flowing through the electric current of power tube just with V
draise and reduce, the power of power tube obtains restriction.
Referring to shown in Fig. 7, is the second structural representation of intelligent power control circuit of the present utility model, wherein, described voltage sample module can adopt in two kinds of above-mentioned modes any one.
Described power control module comprises signal amplification unit, constant current source and partial pressure unit, the first end of described signal amplification unit is connected with the output of described voltage sample module, and the second end of described signal amplification unit, the output of constant current source and the input of partial pressure unit are connected.
Wherein, described partial pressure unit comprises the 4th resistance R4 and the 5th resistance R5, the output of the described first end of the 4th resistance R4, the second end of described signal amplification unit and constant current source is connected, second end of the 4th described resistance R4 is connected with the first end of the 5th described resistance R5, and second end of the 5th described resistance R5 is connected to the ground and connects.
Described constant-current control circuit comprises the second operational amplifier OP2 and the first sampling resistor R
s2the positive input of the second described operational amplifier OP2 is connected with the output of described partial pressure unit, the described inverting input of the second operational amplifier OP2 is connected with the second end of described power tube, the second end of described power tube and the second described sampling resistor R
s2first end be connected, the second described sampling resistor R
s2the second end be connected to the ground and connect.
The operation principle of the second structure of intelligent power control circuit of the present utility model is:
Voltage sampling signal is greater than N after certain value
1open, N
1electric current is with V
dvoltage raises and increases, and the electric current flowing through R1 and R2 reduces thereupon, and VREF also reduces, and LED drive current reduces, I
lED=VREF/R
s.
Refer to shown in Fig. 8, for the structural representation of the intelligent power control circuit in the concrete case study on implementation of the utility model, wherein, this intelligent power control module is used in the intelligent power control circuit of piece-wise linear constant current driving, the input signal of voltage sample module is the input voltage of final stage power tube Mn, and voltage sampling signal is greater than N after certain value
1open, N
1electric current raises with Mn drain terminal voltage and increases, and the electric current flowing through R3 increases thereupon, the anti-phase input terminal voltage of OPn by feedback loop stable at V
n, R
son pressure drop reduce, the drive current of final stage raises with Mn drain terminal voltage and reduces, and realizes limiting the power of power tube Mn.
Power tube described in the utility model is HF switch.
Have employed the intelligent power control circuit in this utility model, compared with prior art, there is following beneficial effect:
Intelligent power control circuit of the present utility model, power control module, when detecting that input voltage is larger, can initiatively reduce LED output current, reduces the power consumption of driver, thus the temperature rise of power-limiting pipe, reduce the heat radiation cost of driver and LED; Intelligent power control circuit of the present utility model, by the ratio between appropriate design input voltage and reduction electric current, improves line regulation; Intelligent power control circuit of the present utility model, structure is simple, easy to operate, has wide range of applications.
In this description, the utility model is described with reference to its specific embodiment.But, still can make various amendment and conversion obviously and not deviate from spirit and scope of the present utility model.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (9)
1. an intelligent power control circuit, is characterized in that, described circuit comprises voltage sample module, power control module and constant-current control module; The described input of voltage sample module is connected with the first end of power tube, the output of described voltage sample module is connected with the input of described power control module, the output of described power control module is connected with the input of described constant-current control module, and the output of described constant-current control module is connected with the 3rd end of described power tube.
2. intelligent power control circuit according to claim 1, it is characterized in that, described voltage sample module comprises the first resistance (R1) and the second resistance (R2), the first end of described the second resistance (R2) is connected with the first end of described power tube, second end of described the second resistance (R2) is connected with the first end of described the first resistance (R1), and the second end of described the first resistance (R1) is connected to the ground and connects.
3. intelligent power control circuit according to claim 2, it is characterized in that, described voltage sample module also comprises the first diode (D1), the positive input of described the first diode (D1) is connected with the second end of described the first resistance (R1), and the inverting input of described the first diode (D1) is connected to the ground and connects.
4. intelligent power control circuit as claimed in any of claims 1 to 3, it is characterized in that, described power control module comprises signal amplification unit, current mirror unit and the 3rd resistance (R3), the first end of described signal amplification unit is connected with the output of described voltage sample module, second end of described signal amplification unit is connected with the input of described current mirror unit, the output of described current mirror unit is connected with the first end of the 3rd described resistance (R3), second end of the 3rd described resistance (R3) is connected with the second end of described power tube.
5. intelligent power control circuit according to claim 4, is characterized in that, described constant-current control module comprises the first operational amplifier (OP1) and the first sampling resistor (R
s1), the inverting input of described the first operational amplifier (OP1) is connected with the first end of the 3rd described resistance (R3), the positive input of described the first operational amplifier (OP1) is connected with reference voltage (VREF), the output of described the first operational amplifier (OP1) is connected with the 3rd end of described power tube, the second end of described power tube and the first described sampling resistor (R
s1) first end be connected, the first described sampling resistor (R
s1) the second end be connected to the ground and connect.
6. intelligent power control circuit as claimed in any of claims 1 to 3, it is characterized in that, described power control module comprises signal amplification unit, constant current source and partial pressure unit, the first end of described signal amplification unit is connected with the output of described voltage sample module, and the second end of described signal amplification unit, the output of constant current source and the input of partial pressure unit are connected.
7. intelligent power control circuit according to claim 6, it is characterized in that, described partial pressure unit comprises the 4th resistance (R4) and the 5th resistance (R5), the first end of the 4th described resistance (R4), the second end of described signal amplification unit and the output of constant current source are connected, second end of the 4th described resistance (R4) is connected with the first end of the 5th described resistance (R5), and the second end of the 5th described resistance (R5) is connected to the ground and connects.
8. intelligent power control circuit according to claim 6, is characterized in that, described constant-current control circuit comprises the second operational amplifier (OP2) and the first sampling resistor (R
s2), the positive input of described the second operational amplifier (OP2) is connected with the output of described partial pressure unit, the described inverting input of the second operational amplifier (OP2) is connected with the second end of described power tube, the second end of described power tube and the second described sampling resistor (R
s2) first end be connected, the second described sampling resistor (R
s2) the second end be connected to the ground and connect.
9. intelligent power control circuit according to claim 1, is characterized in that, described power tube is HF switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420583926.3U CN204090252U (en) | 2014-10-10 | 2014-10-10 | Intelligent power control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420583926.3U CN204090252U (en) | 2014-10-10 | 2014-10-10 | Intelligent power control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204090252U true CN204090252U (en) | 2015-01-07 |
Family
ID=52182916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420583926.3U Withdrawn - After Issue CN204090252U (en) | 2014-10-10 | 2014-10-10 | Intelligent power control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204090252U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104244538A (en) * | 2014-10-10 | 2014-12-24 | 无锡华润矽科微电子有限公司 | Intelligent power control circuit |
| CN107172769A (en) * | 2017-07-26 | 2017-09-15 | 无锡麟力科技有限公司 | Prevent electric backflash circuit under LED light device |
| CN107643783A (en) * | 2017-10-09 | 2018-01-30 | 东莞市翔实信息科技有限公司 | Unmanned electric light driving constant-current circuit, integrated circuit and control system |
| WO2019071998A1 (en) * | 2017-10-09 | 2019-04-18 | 黄俊登 | Unmanned electro-optic driving constant-current circuit, integrated circuit and control system |
| CN112203368A (en) * | 2020-10-09 | 2021-01-08 | 宁波昕科工贸有限公司 | Temperature control method, circuit and heating device |
-
2014
- 2014-10-10 CN CN201420583926.3U patent/CN204090252U/en not_active Withdrawn - After Issue
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104244538A (en) * | 2014-10-10 | 2014-12-24 | 无锡华润矽科微电子有限公司 | Intelligent power control circuit |
| CN104244538B (en) * | 2014-10-10 | 2017-04-12 | 无锡华润矽科微电子有限公司 | Intelligent power control circuit |
| CN107172769A (en) * | 2017-07-26 | 2017-09-15 | 无锡麟力科技有限公司 | Prevent electric backflash circuit under LED light device |
| CN107643783A (en) * | 2017-10-09 | 2018-01-30 | 东莞市翔实信息科技有限公司 | Unmanned electric light driving constant-current circuit, integrated circuit and control system |
| CN107643783B (en) * | 2017-10-09 | 2018-11-23 | 江苏来德福汽车部件有限公司 | Unmanned electric light driving constant-current circuit, integrated circuit and control system |
| WO2019071998A1 (en) * | 2017-10-09 | 2019-04-18 | 黄俊登 | Unmanned electro-optic driving constant-current circuit, integrated circuit and control system |
| WO2019072001A1 (en) * | 2017-10-09 | 2019-04-18 | 周彦漫 | Driverless electro-optical drive constant current circuit, integrated circuit, and control system |
| CN112203368A (en) * | 2020-10-09 | 2021-01-08 | 宁波昕科工贸有限公司 | Temperature control method, circuit and heating device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150107 Effective date of abandoning: 20170412 |