CN108633154B - High-power low-loss constant-current power supply control module - Google Patents
High-power low-loss constant-current power supply control module Download PDFInfo
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- CN108633154B CN108633154B CN201810396362.5A CN201810396362A CN108633154B CN 108633154 B CN108633154 B CN 108633154B CN 201810396362 A CN201810396362 A CN 201810396362A CN 108633154 B CN108633154 B CN 108633154B
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- 239000003381 stabilizer Substances 0.000 claims abstract description 29
- 229910052736 halogen Inorganic materials 0.000 claims abstract description 22
- 150000002367 halogens Chemical class 0.000 claims abstract description 22
- 239000003990 capacitor Substances 0.000 claims description 52
- 230000006641 stabilisation Effects 0.000 claims description 4
- 238000011105 stabilization Methods 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims 3
- 230000000694 effects Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
- H05B39/04—Controlling
-
- 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
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a high-power low-loss constant-current power supply control module, which comprises a power interface, an LDO and a current stabilizer, wherein the power interface is connected with the LDO, and the LDO adjusts the voltage of a vehicle-mounted power supply; the LDO is connected with a current stabilizer, and the current stabilizer receives a stable voltage value from the LDO and outputs constant 4.2A current to the halogen lamp. The invention aims at the halogen car lamp, introduces the constant-current power supply control module, ensures the stability of the power of the halogen car lamp through constant control of the current, can avoid the problem of lamplight flickering when being started by an engine or being interposed by other power utilization function modules, and achieves a stable lighting effect.
Description
Technical Field
The invention relates to a halogen car lamp power supply control module, in particular to a high-power low-loss constant-current power supply control module.
Background
With the rapid development of automobiles at present, the requirement of lamp illumination is higher and higher, and the provision of stable lamp illumination effect is an important standard for the quality of a lamp system. However, as the vehicle-mounted electronic functions are more and more abundant, the automobile power supply is required to supply electric energy for the automobile lamp and supply power for other energy consumption modules at any time. When the vehicle is running, the moment of starting other modules can cause fluctuation of power supply voltage, so that the current in the vehicle lamp is influenced, the power of the vehicle lamp is changed, the phenomenon of unstable lamplight flickering occurs, and the normal lighting or warning effect of the vehicle lamp is influenced.
At present, the constant current source is mainly applied to the aspect of LED car lamps, and the output power is smaller. For high-power halogen car lamps, the problem of power output fluctuation exists; meanwhile, the energy consumption of the halogen lamp is high, so that a high-power low-loss stable constant current source is needed to provide constant current input for the halogen lamp.
Disclosure of Invention
The invention provides a high-power low-loss constant-current power supply control module for solving the problem of unstable lamp light caused by current fluctuation of a halogen car lamp.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
A high-power low-loss constant-current power supply control module comprises a power interface, an LDO (low dropout regulator) and a current stabilizer, wherein the power interface is connected with the LDO, and the LDO adjusts the voltage of a vehicle-mounted power supply; the LDO is connected with a current stabilizer, and the current stabilizer receives a stable voltage value from the LDO and outputs constant 4.2A current to the halogen lamp.
Further, the losses of the current stabilizer itself are lower than 5%.
Further, the current stabilizer is externally connected with two halogen lamps, the voltage of each halogen lamp is 13.5V, and the power is 55W.
The beneficial effects are that:
1. the invention aims at the halogen car lamp, introduces the constant-current power supply control module, ensures the stability of the power of the halogen car lamp through constant control of the current, can avoid the problem of lamplight flickering when being started by an engine or being interposed by other power utilization function modules, and achieves a stable lighting effect.
2. The current stabilizer can reduce the current impact when the bulb is started, prolong the service life of the halogen car lamp, and ensure the use efficiency of electric energy because the loss of the current stabilizer is lower (lower than 5%).
Drawings
FIG. 1 is a block diagram of a constant current power supply control module according to an embodiment of the invention;
FIG. 2 is a circuit diagram of an LDO according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of a current stabilizer according to an embodiment of the present invention;
In the figure: 1-power interface, 2-LDO, 3-current stabilizer.
Detailed Description
The invention will be further described with reference to the drawings and examples.
The embodiment provides a high-power low-loss constant-current power supply control module, which is shown in fig. 1, and comprises a power interface 1, an LDO 2 and a current stabilizer 3, wherein the power interface 1 is connected with the LDO 2, and the LDO 2 regulates the voltage of a vehicle-mounted power supply; the LDO 2 is connected with the current stabilizer 3, and the current stabilizer 3 receives the stable voltage value from the LDO 2 and outputs constant 4.2A current halogen lamp so as to ensure that the halogen lamp is lighted with stable power.
In this embodiment, the voltage fluctuation range of the vehicle-mounted power supply is generally 6-17V, and when the vehicle is started and other power utilization modules are started, the voltage can obviously fluctuate, so that the voltage loaded on the halogen vehicle lamp is affected, and the light is unstable. When the constant current power supply control module is connected, the current output by the vehicle-mounted power supply after being connected with the constant current power supply control module is constant to 4.2A, and the vehicle-mounted power supply is not influenced by other power utilization modules. The voltage of the halogen lamp is generally about 13V, and the output power of the halogen lamp is constant 55W/V.
In the present embodiment, as shown in fig. 2, LDO 2 includes a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, and a three-terminal regulator U1 (LM 7805); the 8 pin of the three-terminal voltage regulator U1 is connected with one end of the twelfth capacitor C12 and one end of the tenth capacitor C10, and is used as a voltage input end before voltage stabilization to input 13.5V voltage; the other end of the twelfth capacitor C12 is connected with one end of the eleventh capacitor C11 and is used as a grounding end; the other end of the tenth capacitor C10 is connected with the other end of the eleventh capacitor C11; the 1 pin of the three-terminal voltage stabilizer U1 is used as a voltage output end after voltage stabilization to output 5V voltage; the 7 pin and the 6 pin of the three-terminal voltage stabilizer U1 are connected and serve as a grounding end; the 2 pin and the 3 pin of the three-terminal voltage regulator U1 are connected and serve as a grounding terminal.
In this embodiment, as shown in fig. 3, the current stabilizer 3 includes a first operational amplifier U2 (LM 101A), a second operational amplifier U3 (LM 308), first to twelfth resistors R1-R12, first to ninth capacitors C1-C9, a first zener diode D1 (LM 113), a second zener diode D2 (1N 821), first to fifth transistors T1-T5, first to fifth light emitting diodes LED1-LED5, a second adjustable resistor W1 and a second adjustable resistor W2, one end of the first resistor R1 is connected to one end of the first capacitor C1, one end of the eighth resistor R8, one end of the first zener diode D1 and one end of the first adjustable resistor W1, and is used as a voltage input positive terminal Ui to input 25-35V voltage; the other end of the first capacitor C1 is grounded; the other end of the eighth resistor R8 is connected with the emitter of a fifth triode T5 (2N 2905), the base of the fifth triode T5 is connected with the other end of the first zener diode D1, the other end of the first adjustable resistor W1 and one end of a seventh resistor R7, the collector of the fifth triode T5 is connected with one end of a second zener diode D2 and one end of the second adjustable resistor W2, the other end of the second zener diode D2 is connected with the other end of the second adjustable resistor W2, the other end of the seventh resistor R7, one end of an eighth capacitor C8, one end of a twelfth resistor R12 and one end of a fourth light-emitting diode LED4 (1N 4002) to serve as a grounding end; the adjustable end of the first adjustable resistor W1 is connected with the 2 pin of the first operational amplifier U2 through a fourth resistor R4, the 3 pin of the first operational amplifier U2 is connected with one end of a second resistor R2, and the other end of the second resistor R2 is connected with the other end of the first resistor R1, the collector of a first triode T1 (LM 395), the collector of a second triode T2 (LM 395), the collector of a third triode T3 (LM 395) and one end of a fourth capacitor C4; the 6 pin of the first operational amplifier U2 is connected with one end of a first light emitting diode LED1 (1N 457), and the other end of the first light emitting diode LED1 is connected with the other end of a fourth capacitor C4, the base electrode of a first triode T1, the base electrode of a second triode T2, the base electrode of a third triode T3 and one end of a tenth resistor R10; the 1 pin of the first operational amplifier U2 is connected with the 8 pin of the first operational amplifier U2 and one end of the second light emitting diode LED2 (1N 457) through a ninth capacitor C9; the other end of the second light emitting diode LED2 is connected with the 6 pin of the second operational amplifier U3, one end of the third capacitor C3, the other end of the tenth resistor R10, one end of the eleventh resistor R11 and one end of the third light emitting diode LED 3; the pin 2 of the second operational amplifier U3 is connected with one end of a sixth resistor R6, the other end of a third capacitor C3 and one end of the third resistor R3, and the other end of the sixth resistor R6 is grounded; the other end of the third resistor R3 is connected with the other end of the fourth light emitting diode LED4 (1N 4002), one end of the sixth capacitor C6, the emitter of the first triode T1, the emitter of the second triode T2, the emitter of the third triode T3, the collector of the fourth triode T4 (LM 395), one end of the fifth capacitor C5, the other end of the third triode LED3 and the other end of the eleventh resistor R11 to serve as the output end of the current stabilizer 3; the 1 pin of the second operational amplifier U3 is connected with the 8 pin of the second operational amplifier U3 through a second capacitor C2; the pin 3 of the second operational amplifier U3 is connected with the other end of the eighth capacitor C8 and one end of the fifth resistor R5, and the other end of the fifth resistor R5 is connected with the adjustable end of the second adjustable resistor W2; the pin 9 of the second operational amplifier U3 is connected with one end of a ninth resistor R9, the other end of a fifth capacitor C5 and the base electrode of a fourth triode T4; the other end of the ninth resistor R9 is connected with the emitter of the fourth triode T4, one end of the fifth light emitting diode LED5 (1N 4002) and one end of the seventh capacitor C7, and is used as a voltage input negative terminal-Ui for inputting-5 to-10V voltage; the other end of the sixth capacitor C6 is connected with the other end of the twelfth resistor R12; the other end of the fifth light emitting diode LED5 is connected to the other end of the seventh capacitor C7 as a ground terminal.
It should be apparent to those skilled in the art that various modifications or variations can be made in the present invention without requiring any inventive effort by those skilled in the art based on the technical solutions of the present invention.
Claims (3)
1. A high-power low-loss constant-current power supply control module is characterized in that: the power supply comprises a power supply interface (1), an LDO (2) and a current stabilizer (3), wherein the power supply interface (1) is connected with the LDO (2), and the LDO (2) adjusts the voltage of a vehicle-mounted power supply; the LDO (2) is connected with the current stabilizer (3), and the current stabilizer (3) receives a stable voltage value from the LDO (2) and outputs constant 4.2A current to the halogen lamp;
The LDO (2) comprises a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12 and a three-terminal voltage regulator U1 with the model LM 7805; the 8 pin of the three-terminal voltage regulator U1 is connected with one end of the twelfth capacitor C12 and one end of the tenth capacitor C10, and is used as a voltage input end before voltage stabilization to input 13.5V voltage; the other end of the twelfth capacitor C12 is connected with one end of the eleventh capacitor C11 and is used as a grounding end; the other end of the tenth capacitor C10 is connected with the other end of the eleventh capacitor C11; the 1 pin of the three-terminal voltage stabilizer U1 is used as a voltage output end after voltage stabilization to output 5V voltage; the 7 pin and the 6 pin of the three-terminal voltage stabilizer U1 are connected and serve as a grounding end; the 2 pin and the 3 pin of the three-terminal voltage stabilizer U1 are connected and serve as a grounding end;
The current stabilizer (3) comprises a first operational amplifier U2 with the model LM101A, a second operational amplifier U3 with the model LM308, first to twelfth resistors R1-R12, first to ninth capacitors C1-C9, a first zener diode D1, a second zener diode D2, first to fifth triodes T1-T5, first to fifth light emitting diodes LED1-LED5, a second adjustable resistor W1 and a second adjustable resistor W2, wherein one end of the first resistor R1 is connected with one end of the first capacitor C1, one end of the eighth resistor R8, one end of the first zener diode D1 and one end of the first adjustable resistor W1, and is used as a voltage input positive terminal Ui for inputting 25-35V voltage; the other end of the first capacitor C1 is grounded; the other end of the eighth resistor R8 is connected with the emitter of the fifth triode T5, the base electrode of the fifth triode T5 is connected with the other end of the first voltage stabilizing diode D1, the other end of the first adjustable resistor W1 and one end of the seventh resistor R7, the collector electrode of the fifth triode T5 is connected with one end of the second voltage stabilizing diode D2 and one end of the second adjustable resistor W2, the other end of the second voltage stabilizing diode D2 is connected with the other end of the second adjustable resistor W2, the other end of the seventh resistor R7, one end of the eighth capacitor C8, one end of the twelfth resistor R12 and one end of the fourth light emitting diode LED4 to serve as grounding ends; the adjustable end of the first adjustable resistor W1 is connected with the 2 pin of the first operational amplifier U2 through a fourth resistor R4, the 3 pin of the first operational amplifier U2 is connected with one end of a second resistor R2, and the other end of the second resistor R2 is connected with the other end of the first resistor R1, the collector of the first triode T1, the collector of the second triode T2, the collector of the third triode T3 and one end of a fourth capacitor C4; the 6 pin of the first operational amplifier U2 is connected with one end of a first light emitting diode LED1, and the other end of the first light emitting diode LED1 is connected with the other end of a fourth capacitor C4, the base electrode of a first triode T1, the base electrode of a second triode T2, the base electrode of a third triode T3 and one end of a tenth resistor R10; the pin 1 of the first operational amplifier U2 is connected with the pin 8 of the first operational amplifier U2 and one end of the second light emitting diode LED2 through a ninth capacitor C9; the other end of the second light emitting diode LED2 is connected with the 6 pin of the second operational amplifier U3, one end of the third capacitor C3, the other end of the tenth resistor R10, one end of the eleventh resistor R11 and one end of the third light emitting diode LED 3; the pin 2 of the second operational amplifier U3 is connected with one end of a sixth resistor R6, the other end of a third capacitor C3 and one end of the third resistor R3, and the other end of the sixth resistor R6 is grounded; the other end of the third resistor R3 is connected with the other end of the fourth light emitting diode LED4, one end of the sixth capacitor C6, the emitter of the first triode T1, the emitter of the second triode T2, the emitter of the third triode T3, the collector of the fourth triode T4, one end of the fifth capacitor C5, the other end of the third triode LED3 and the other end of the eleventh resistor R11 to serve as the output end of the current stabilizer 3; the 1 pin of the second operational amplifier U3 is connected with the 8 pin of the second operational amplifier U3 through a second capacitor C2; the pin 3 of the second operational amplifier U3 is connected with the other end of the eighth capacitor C8 and one end of the fifth resistor R5, and the other end of the fifth resistor R5 is connected with the adjustable end of the second adjustable resistor W2; the pin 9 of the second operational amplifier U3 is connected with one end of a ninth resistor R9, the other end of a fifth capacitor C5 and the base electrode of a fourth triode T4; the other end of the ninth resistor R9 is connected with the emitter of the fourth triode T4, one end of the fifth light-emitting diode LED5 and one end of the seventh capacitor C7, and is used as a voltage input negative terminal-Ui to input-5 to-10V voltage; the other end of the sixth capacitor C6 is connected with the other end of the twelfth resistor R12; the other end of the fifth light emitting diode LED5 is connected to the other end of the seventh capacitor C7 as a ground terminal.
2. The high-power low-loss constant-current power supply control module according to claim 1, wherein: the loss of the current stabilizer (3) is lower than 5%.
3. The high-power low-loss constant-current power supply control module according to claim 1, wherein: the current stabilizer (3) is externally connected with two halogen car lights, the voltage of each halogen car light is 13.5V, and the power is 55W.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810396362.5A CN108633154B (en) | 2018-04-28 | 2018-04-28 | High-power low-loss constant-current power supply control module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810396362.5A CN108633154B (en) | 2018-04-28 | 2018-04-28 | High-power low-loss constant-current power supply control module |
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| CN108633154A CN108633154A (en) | 2018-10-09 |
| CN108633154B true CN108633154B (en) | 2024-05-17 |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006139755A (en) * | 2004-10-15 | 2006-06-01 | Toshiba Lighting & Technology Corp | Led type marker light lighting device and marker light system |
| CN101282607A (en) * | 2007-04-05 | 2008-10-08 | 奥斯兰姆施尔凡尼亚公司 | Power supply for halogen lamp |
| CN101636021A (en) * | 2008-07-25 | 2010-01-27 | 深圳市海洋王照明科技股份有限公司 | LED constant current driving circuit |
| CN101711071A (en) * | 2009-11-25 | 2010-05-19 | 海洋王照明科技股份有限公司 | LED control circuit and LED device |
| CN203015247U (en) * | 2012-11-21 | 2013-06-19 | 广州市德晟照明实业有限公司 | Constant current driving device |
| WO2015003530A1 (en) * | 2013-07-11 | 2015-01-15 | 华为技术有限公司 | Low-light testing tool and control method thereof |
| CN204616156U (en) * | 2015-04-30 | 2015-09-02 | 东莞健达照明有限公司 | A kind of LED drive circuit being applicable to controllable silicon light modulation |
| WO2016086740A1 (en) * | 2014-12-03 | 2016-06-09 | 深圳市裕富照明有限公司 | Efficient and energy saving led illumination system based on wi-fi+zigbee communication |
| CN205902171U (en) * | 2016-08-05 | 2017-01-18 | 上海文迅电子有限公司 | Optical equipment is transferred to bus type of self -adaptation loadtype |
| CN208210401U (en) * | 2018-04-28 | 2018-12-07 | 常州星宇车灯股份有限公司 | A kind of high-power low-loss constant-current supply control mould group |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015056161A1 (en) * | 2013-10-15 | 2015-04-23 | Koninklijke Philips N.V. | Drive unit for a lighting element and operating method therefor |
-
2018
- 2018-04-28 CN CN201810396362.5A patent/CN108633154B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006139755A (en) * | 2004-10-15 | 2006-06-01 | Toshiba Lighting & Technology Corp | Led type marker light lighting device and marker light system |
| CN101282607A (en) * | 2007-04-05 | 2008-10-08 | 奥斯兰姆施尔凡尼亚公司 | Power supply for halogen lamp |
| CN101636021A (en) * | 2008-07-25 | 2010-01-27 | 深圳市海洋王照明科技股份有限公司 | LED constant current driving circuit |
| CN101711071A (en) * | 2009-11-25 | 2010-05-19 | 海洋王照明科技股份有限公司 | LED control circuit and LED device |
| CN203015247U (en) * | 2012-11-21 | 2013-06-19 | 广州市德晟照明实业有限公司 | Constant current driving device |
| WO2015003530A1 (en) * | 2013-07-11 | 2015-01-15 | 华为技术有限公司 | Low-light testing tool and control method thereof |
| WO2016086740A1 (en) * | 2014-12-03 | 2016-06-09 | 深圳市裕富照明有限公司 | Efficient and energy saving led illumination system based on wi-fi+zigbee communication |
| CN204616156U (en) * | 2015-04-30 | 2015-09-02 | 东莞健达照明有限公司 | A kind of LED drive circuit being applicable to controllable silicon light modulation |
| CN205902171U (en) * | 2016-08-05 | 2017-01-18 | 上海文迅电子有限公司 | Optical equipment is transferred to bus type of self -adaptation loadtype |
| CN208210401U (en) * | 2018-04-28 | 2018-12-07 | 常州星宇车灯股份有限公司 | A kind of high-power low-loss constant-current supply control mould group |
Non-Patent Citations (1)
| Title |
|---|
| 一种新的汽车前照灯驱动电路设计;谢轩;谢完成;;价值工程(14);全文 * |
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