CN201967198U - LED lamp driving power circuit - Google Patents
LED lamp driving power circuit Download PDFInfo
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- CN201967198U CN201967198U CN2010206807204U CN201020680720U CN201967198U CN 201967198 U CN201967198 U CN 201967198U CN 2010206807204 U CN2010206807204 U CN 2010206807204U CN 201020680720 U CN201020680720 U CN 201020680720U CN 201967198 U CN201967198 U CN 201967198U
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- led lamp
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Abstract
The invention discloses a LED lamp driving power circuit, which belongs to LED driving power technical field. This kind of LED lamp driving power circuit mainly includes an AC input (AC IN) rectifying and wave-filtering circuit, a frequency modulation circuit and a current feedback circuit, and is electrically connected mutually, adopts the drive chip IC of wide voltage input and external power MOS pipe component step-down formula transfer circuit to drive the LED lamp; The frequency modulation circuit comprises drive chip IC and fourth resistance RD, and the current feedback circuit comprises drive chip IC, the 5th resistance RE and electric current measuring resistance RCS. The LED lamp driving power circuit reduces the temperature of LED lamp driving power circuit through the temperature that reduces the MOS pipe, thereby temperature that can effectual reduction LED lamp, can also be applicable to the LED lamp of different model specifications at service life of extension LED lamp.
Description
Technical field
The utility model relates to a kind of LED lamp driving power source circuit, belongs to light-emitting diode driving power technical field.
Background technology
Most of LED lamp driving power source all is to adopt control metal-oxide-semiconductor (Metal-Oxide-Semicon
Ductor, metal oxide semiconductor transistor) method of grid voltage is controlled the operating current of LED lamp, the LED lamp is operated under the rational operating current state, can prolong the useful life of LED lamp, but the LED lamp driving power source is in working order down except providing the energy for the LED lamp, itself also need to consume the energy of a part, its power consumption is many more, and the temperature of driving power itself is just high more.And the temperature of driving power is mainly caused by metal-oxide-semiconductor, and the temperature of metal-oxide-semiconductor and conducting resistance, switching frequency, instantaneous short circuit are current related.If the temperature of driving power is too high, can influence the useful life of LED lamp.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of LED lamp driving power source circuit, and it has reduced the temperature of metal-oxide-semiconductor, and power consumption and the temperature of LED lamp driving power source circuit under in working order reduces greatly.
The technical solution adopted in the utility model is: a kind of LED lamp driving power source circuit, it comprises that mainly one exchanges input rectifying filter circuit, a frequency adjustment circuit and a current feedback circuit, and is electrically connected mutually.It comprises that also one is adopted the chip for driving IC of wide voltage input and external power MOS pipe formation buck translation circuit to come the driving LED lamp; Described frequency adjustment circuit is made of chip for driving IC and the 4th resistance R D, and described current feedback circuit is made of chip for driving IC, the 5th resistance R E and current sense resistor RCS.
Described chip for driving IC is connected with the positive pole of DC power supply through the first resistance R A, is connected with the negative pole of DC power supply with the 3rd resistance R C through the second resistance R B, potentiometer VR1; Chip for driving IC is electrically connected with the grid G of metal-oxide-semiconductor.
The source S of described metal-oxide-semiconductor is connected with the negative pole of DC power supply through current sense resistor RCS.
The drain D of described metal-oxide-semiconductor is electrically connected with diode D1, and diode D1 is connected with the positive pole of DC power supply with inductance L 1, constitutes electric loop with diode D1 and inductance L 1 after capacitor C and LED lamp are connected in parallel.
The beneficial effects of the utility model are: this LED lamp driving power source circuit comprises that mainly one exchanges input rectifying filter circuit, a frequency adjustment circuit and a current feedback circuit, and be electrically connected mutually, adopt the chip for driving IC of wide voltage input and external power MOS pipe formation buck translation circuit to come the driving LED lamp; Frequency adjustment circuit is made of chip for driving IC and the 4th resistance R D, and current feedback circuit is made of chip for driving IC, the 5th resistance R E and current sense resistor RCS.This LED lamp driving power source circuit reduces the temperature of LED lamp driving power source circuit by the temperature that reduces metal-oxide-semiconductor, thereby can effectively reduce the temperature of LED lamp, prolongs the useful life of LED lamp, can also be applicable to the LED lamp of different model specification.
Description of drawings
Fig. 1 is a kind of LED lamp driving power source circuit diagram.
Embodiment
Lift a preferred embodiment below, and come the clearer the utility model that intactly illustrates in conjunction with the accompanying drawings.
Fig. 1 shows a kind of LED lamp driving power source circuit diagram.LED lamp driving power source circuit comprises chip for driving IC(HV9910B), current sense resistor RCS, the first resistance R A, the second resistance R B, the 3rd resistance R C, the 4th resistance R D, the 5th resistance R E, potentiometer VR1, capacitor C, diode D1, inductance L 1 and metal-oxide-semiconductor, the 4th resistance R D is a frequency adjustment resistance, chip for driving IC comprises the RL pin, the GND pin, CS pin and GATE pin, metal-oxide-semiconductor comprises the G utmost point (grid), the S utmost point (source electrode) and the D utmost point (drain electrode), the RL pin of chip for driving IC is connected with potentiometer VR1, the CS pin of chip for driving IC is connected with the 5th resistance R E, the GATE pin of chip for driving IC is connected with the G utmost point of metal-oxide-semiconductor, the second resistance R B and the 3rd resistance R C are connected to the two ends of potentiometer VR1, the first resistance R A, the second resistance R B, the 4th resistance R D is connected with chip for driving IC, the S utmost point of metal-oxide-semiconductor and the 5th resistance R E, current sense resistor RCS connects, the D utmost point of metal-oxide-semiconductor is connected with diode D1, be connected with inductance L 1 after diode D1 and the capacitor C parallel connection, inductance L 1 is connected with the LED lamp.Wherein, chip for driving IC and the 4th resistance R D constitute a frequency adjustment circuit, by changing the size of the 4th resistance R D resistance, can change the operating frequency of chip for driving IC.The CS pin of chip for driving IC, the 5th resistance R E and current sense resistor RCS constitute a current feedback circuit.Sense of current when sense of current when straight arrows is represented the metal-oxide-semiconductor conducting, curved arrow are represented the metal-oxide-semiconductor shutoff.
The interchange input of LED lamp driving power source circuit becomes direct voltage Ui behind rectifying and wave-filtering, the part of direct voltage Ui provides the energy directly for the LED lamp by inductance L 1, another part provides operating voltage for chip for driving IC by the first resistance R A, a stable voltage output is provided in chip for driving IC inside, by the second resistance R B, potentiometer VR1, the 3rd resistance R C is connected in series to ground, the RL pin (output current adjustment pin) of another termination chip for driving IC of potentiometer VR1, adjust the potentiometer VR1 size of resistance over the ground, give signal voltage of RL pin, inner at chip for driving IC like this through the computing amplification, at the GATE pin a constant voltage output is just arranged, and metal-oxide-semiconductor is typical voltage control current mode element, when its grid has one during greater than cut-in voltage, source electrode and the drain electrode between with regard to conducting, when this voltage constant, electric current output also is constant current, and and the independent from voltage of the load of outside serial connection.When energising work, by adjusting the size of potentiometer resistance, change size to the metal-oxide-semiconductor grid voltage, thereby the size that changes output current reaches requirement, electric current arrives ground by current sense resistor RCS, just there is a voltage difference at the two ends of current sense resistor RCS, this voltage difference feeds back to the CS pin of chip for driving IC by the 5th resistance R E, compare with a reference voltage of chip for driving IC inside, the comparison amplifier of inside just turn-offs output when surpassing inner reference voltage, thereby turn-off the output of the grid voltage of metal-oxide-semiconductor, so just turn-offed metal-oxide-semiconductor.At the metal-oxide-semiconductor blocking interval and since on the inductance L 1 in the energising storage energy, at this moment energy will discharge by LED lamp and fly-wheel diode, for next turn on process provides normal condition of work.
The 4th resistance R D of frequency adjustment circuit selects key very, when operating frequency is too high, the switch number of times of metal-oxide-semiconductor also just too much, comprise conduction loss, instantaneous short circuit current loss and switching loss etc. in the power consumption of metal-oxide-semiconductor, and switching loss is main, the approach that reduces switching loss reduces the switch number of times exactly, so just requires the operating frequency can not be too high.When operating frequency is too low, since when metal-oxide-semiconductor turn-offs on the inductance energy stored to continue to provide energy to the LED lamp, energy shortage on the inductance is to be maintained to next turn-on cycle, can cause the brightness of LED lamp not reach requirement like this, and might cause noise, and cause the inductance temperature too high, influence the useful life of inductance, and when operating frequency was in 200hz arrives this scope of 20khz, also can produce the people can audible noise.So just require driving power that a suitable operating frequency is arranged, the LED chip for driving of present most of non-isolation type all has an operating frequency range requirement, can both operate as normal in this scope, but has only scope service behaviour the best of one section very little in this operating frequency range, this power supply is tested through repeatedly changing operating frequency in the working frequency of chip scope, selected suitable frequency adjustment resistance, make operating frequency best in 25 ~ 40khz scope, performance reaches requirement, driving power is in rational operating state following time, the switching loss of metal-oxide-semiconductor also is reduced to the best, thereby has reduced the working temperature of metal-oxide-semiconductor.
Current sense resistor RCS and the 5th resistance R E also are very important, because what output circuit connected is inductive load, the control of output current is to control by the peak current of metal-oxide-semiconductor, rising violently when electric current moment is that electric current sharply strengthens, the working loss of metal-oxide-semiconductor also and then strengthens, duration of short circuit is long more, and loss is big more.And by behind the current sense resistor, when electric current rises violently, the voltage at current sense resistor RCS two ends just sharply raises, the voltage that feeds back to the CS pin by the 5th resistance R E also and then raises, when the voltage on the CS pin surpasses reference voltage, chip for driving IC has just turn-offed metal-oxide-semiconductor, thereby has so just avoided the instantaneous short circuit electric current of inductive circuit to reduce the loss of metal-oxide-semiconductor.
Adopt the chip for driving IC and the external power MOS pipe formation BUCK circuit (buck translation circuit) of wide voltage input to come the driving LED lamp, can in full voltage range, work, and the voltage summation that can be used for the LED lamp is less than 0.4 times input voltage, and the electric current summation is less than the string and the combination of the various LED lamps of 400mA.During conducting, when input voltage is powered to main circuit, also provide operating voltage to chip for driving, give the grid of metal-oxide-semiconductor from voltage signal of GATE pin output of chip for driving, metal-oxide-semiconductor just has an electric current to pass through like this, and a part is given the power supply of LED lamp, returns the inductance storage power simultaneously.The source electrode of metal-oxide-semiconductor is connected with one and regulates the resistance of electric current, and regulates Voltage Feedback in the current resistor to the CS pin of chip, and when electric current rose violently, when the voltage on the CS pin surpassed threshold values, the output signal of GATE pin stopped, and turn-offed metal-oxide-semiconductor.At this moment energy stored continues to the power supply of LED lamp, up to the arrival of next cycle by fly-wheel diode on the inductance.By the resistance size of regulating electric current be the size of may command output current and the voltage of LED lamp it doesn't matter, can mate the LED lamp of multiple model.
Though more than described embodiment of the present utility model, but those skilled in the art is to be understood that, these only illustrate, and under the prerequisite that does not deviate from principle of the present utility model and essence, can make numerous variations or modification to these execution modes.Therefore, protection range of the present utility model is limited by appended claims.
Claims (4)
1. LED lamp driving power source circuit, it comprises that mainly one exchanges input rectifying filter circuit, a frequency adjustment circuit and a current feedback circuit, and is electrically connected mutually; It is characterized in that: it comprises that also one is adopted the chip for driving IC of wide voltage input and external power MOS pipe formation buck translation circuit to come the driving LED lamp; Described frequency adjustment circuit is made of chip for driving IC and the 4th resistance R D, and described current feedback circuit is made of chip for driving IC, the 5th resistance R E and current sense resistor RCS.
2. according to the described LED lamp driving power source of claim 1 circuit, it is characterized in that: described chip for driving IC is connected with the positive pole of DC power supply through the first resistance R A, is connected with the negative pole of DC power supply with the 3rd resistance R C through the second resistance R B, potentiometer VR1; Chip for driving IC is electrically connected with the grid G of metal-oxide-semiconductor.
3. according to the described LED lamp driving power source of claim 2 circuit, it is characterized in that: the source S of described metal-oxide-semiconductor is connected with the negative pole of DC power supply through current sense resistor RCS.
4. according to the described LED lamp driving power source of claim 3 circuit, it is characterized in that: the drain D of described metal-oxide-semiconductor is electrically connected with diode D1, and diode D1 is connected with the positive pole of DC power supply with inductance L 1, constitutes electric loop with diode D1 and inductance L 1 after capacitor C and LED lamp are connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206807204U CN201967198U (en) | 2010-12-26 | 2010-12-26 | LED lamp driving power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206807204U CN201967198U (en) | 2010-12-26 | 2010-12-26 | LED lamp driving power circuit |
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| CN201967198U true CN201967198U (en) | 2011-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010206807204U Expired - Fee Related CN201967198U (en) | 2010-12-26 | 2010-12-26 | LED lamp driving power circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103781242A (en) * | 2013-12-25 | 2014-05-07 | 南京全屋电器开关有限公司 | Wide-voltage-range dynamic constant-current LED control circuit |
| CN103929846A (en) * | 2013-01-16 | 2014-07-16 | 硕颉科技股份有限公司 | Light-emitting diode load driving device |
| CN116887478A (en) * | 2023-08-01 | 2023-10-13 | 广州威博智能科技股份有限公司 | Synchronous rectification automobile LED lamp driving circuit |
-
2010
- 2010-12-26 CN CN2010206807204U patent/CN201967198U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103929846A (en) * | 2013-01-16 | 2014-07-16 | 硕颉科技股份有限公司 | Light-emitting diode load driving device |
| CN103781242A (en) * | 2013-12-25 | 2014-05-07 | 南京全屋电器开关有限公司 | Wide-voltage-range dynamic constant-current LED control circuit |
| CN116887478A (en) * | 2023-08-01 | 2023-10-13 | 广州威博智能科技股份有限公司 | Synchronous rectification automobile LED lamp driving circuit |
| CN116887478B (en) * | 2023-08-01 | 2024-03-29 | 广州威博智能科技股份有限公司 | Synchronous rectification automobile LED lamp driving circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110907 Termination date: 20111226 |