CN202696962U - Light emitting diode (LED) driving power supply - Google Patents
Light emitting diode (LED) driving power supply Download PDFInfo
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- CN202696962U CN202696962U CN 201220273738 CN201220273738U CN202696962U CN 202696962 U CN202696962 U CN 202696962U CN 201220273738 CN201220273738 CN 201220273738 CN 201220273738 U CN201220273738 U CN 201220273738U CN 202696962 U CN202696962 U CN 202696962U
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- driving power
- voltage
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Abstract
The utility model discloses a light emitting diode (LED) driving power supply, which comprises a power input end, a full-bridge rectification module which is connected with the power input end and rectifies power, and a linear constant-current module which is connected with the full-bridge rectification module and is used for adjusting the power into a constant-current driving source, wherein the linear constant-current module is connected with a load LED lamp; a linearly driven first triode BJT1, a linearly driven controller CB, an external adjustment resistor Radj and an external resistor Ren are arranged in the linear constant-current module; and a second triode BJT2, a current multiplier VTM and a voltage control current source VCCS are arranged in the controller CB. Therefore, the number of parts of the LED driving power source is relatively small; a circuit is simple, and the cost is relatively low, so that the whole LED driving power supply is minimized and modularized; moreover, the linear constant-current module comprises an electrolysis capacitor which is difficult to break through; and the service life of the LED driving power supply is prolonged.
Description
Technical field
The utility model circuit relates to a kind of LED driving power, particularly a kind of LED driving power that adopts linear constant current method.
Background technology
Adopt the LED lamp just obtaining using more and more widely as lighting source, but the LED lamp need to by for a long time normal operation of driving power, cannot directly connect power supply.The driving method of LED is of all kinds, and existing LED driving power has mostly adopted the constant current method of Switching Power Supply voltage stabilizing, and the method circuit cost is high, circuit is complicated, also has electromagnetic interference; In converting the circuit of constant current drive source to, power supply mostly all includes high withstand voltage electrochemical capacitor device as filtering device, and this kind electrochemical capacitor is operated in the heat that the LED lamp distributes, the electrolyte temperature influence is easily dry, breakdown easily, has affected the useful life of constant current drive source.
Therefore, how to realize that a kind of circuit is simple, cost is lower, and useful life, long LED driving power was the technical problem that needs to be resolved hurrily in the industry.
Summary of the invention
Main purpose of the present utility model provides a kind of LED driving power, is intended to realize that a kind of parts are less, circuit simple, cost is lower, and the LED driving power of growing useful life.
The utility model proposes a kind of LED driving power, comprise power input, the full-bridge rectification module that is connected and power supply is carried out rectification with power input, the linear constant flow module that is connected and power adjustment is become the constant current drive source with the full-bridge rectification module, linear constant flow module is connected with load LED lamp, be provided with the first triode BJT1 of Linear Driving in the linear constant flow module, the controller CB of Linear Driving, external regulating resistance Radj, external resistance R en, be provided with the second triode BJT2 in the controller CB, current multiplier VTM, Voltage-controlled Current Source VCCS, the input of power supply is connected with the input En of linear constant flow module after by external resistance R en, input En is connected with the base stage of the second triode BJT2, thereby external resistance R en makes the base stage of the second triode BJT2 have high level to trigger the second triode BJT2 and makes its conducting work, the collector electrode of the second triode BJT2 is connected with current multiplier VTM, and emitter is connected with the positive pole of Voltage-controlled Current Source VCCS; The negative pole of Voltage-controlled Current Source VCCS is connected with the first end of external regulating resistance Radj, the other end ground connection of external regulating resistance Radj, the first end of external regulating resistance Radj are connected with Voltage-controlled Current Source VCCS by a feedback loop and have formed the close loop control circuit circuit; In addition, the first end of external regulating resistance Radj also is connected with the emitter of the first triode BJT1, the base stage of the first triode BJT1 is connected with current multiplier VTM, the collector electrode of the first triode BJT1 is connected with the negative pole of load LED lamp, and the positive pole of load LED lamp and positive source connect to form the regulation and control loop; Electric current is flow through the pressure drop of external regulating resistance Radj generation as target voltage Ut, the close loop control circuit circuit feeds back the information of target voltage Ut in Voltage-controlled Current Source VCCS, the impedance of the first triode BJT1 is regulated in the closed loop gain that Voltage-controlled Current Source VCCS changes whole close loop control circuit circuit according to the information of voltage that receives, it is constant that target voltage Ut is followed, and drives thereby make the electric current that flows through the first triode BJT1 carry out constant current to load LED lamp in current margin.
Preferably, linear constant flow module can convert power supply to the constant current drive source when current value is less than 450mA in circuit.
Preferably, the scope with the operating current of the adaptive load LED lamp of LED driving power is 20mA to 450mA.
Preferably, make power supply become the dimming drive power that can carry out light modulation to load LED lamp at the input EN place of controller CB input PWM format signal.
Preferably, when transshipping, drive current some linear constant flow module parallel connections can be shunted driving.
The utility model LED driving power comprises power input, be connected with power input and power supply is carried out the full-bridge rectification module of rectification, is connected and power adjustment is become the linear constant flow module of constant current drive source with the full-bridge rectification module, linear constant flow module is connected with load LED lamp, be provided with the first triode BJT1, the controller CB of Linear Driving, external regulating resistance Radj, the external resistance R en of Linear Driving in the linear constant flow module, be provided with the second triode BJT2, current multiplier VTM, Voltage-controlled Current Source VCCS in the controller CB.Like this, the parts of LED driving power are less, and circuit is simple, cost is lower, make whole LED driving power can accomplish miniaturization, modularity design, and in linear constant flow module, do not contain easily breakdown electrochemical capacitor, the useful life of having improved the LED driving power.
Description of drawings
Fig. 1 is the integrated circuit principle schematic of the utility model LED driving power in a practical application circuit;
Fig. 2 is the use principle circuit diagram of the utility model LED driving power neutral line constant flow module;
Fig. 3 is the circuit theory schematic diagram of the utility model LED driving power neutral line constant flow module;
Fig. 4 is the schematic diagram of PWM form dimming driving circuit in the utility model LED driving power;
Fig. 5 uses two linear constant flow module parallel connections to make the schematic diagram of driving power in the utility model LED driving power.
The realization of the utility model purpose, functional characteristics and advantage are described further with reference to accompanying drawing in connection with case study on implementation.
Embodiment
Should be appreciated that implementation case described herein only in order to explaining the utility model, and be not used in restriction the utility model.
Referring to figs. 1 through Fig. 5, one embodiment of LED driving power of the present utility model is proposed, comprise power input, the full-bridge rectification module 100 that is connected and AC power Vac is carried out rectification with power input, the linear constant flow module 200 that is connected and does not contain electrochemical capacitor with full-bridge rectification module 100, linear constant flow module 200 is connected with load LED lamp 300, power input can be for exchanging the input of input or direct current, the power input that present embodiment is selected is 12 volts direct current or alternating current, and linear constant flow module 200 becomes power adjustment the electric current of constant current drive source and convection current overload LED lamp 300 to carry out adaptive adjusting.
Be provided with the first triode BJT1, the controller abbreviation CB of Linear Driving, external regulating resistance Radj, the external resistance R en of Linear Driving in the linear constant flow module 200, a pin ground connection of linear constant flow module 200.Be provided with the second triode BJT2, current multiplier VTM, Voltage-controlled Current Source VCCS in the controller CB, the input of power supply is connected with the input En of linear constant flow module 200 after by external resistance R en, input En is connected with the base stage of the second triode BJT2, thereby external resistance R en makes the base stage of the second triode BJT2 have high level to trigger the second triode BJT2 and makes its conducting work, the collector electrode of the second triode BJT2 is connected with current multiplier VTM, and emitter is connected with the positive pole of Voltage-controlled Current Source VCCS; The negative pole of Voltage-controlled Current Source VCCS is connected with the first end of external regulating resistance Radj, the other end ground connection of external regulating resistance Radj, the first end of external regulating resistance Radj are connected with Voltage-controlled Current Source VCCS by a feedback loop and have formed the close loop control circuit circuit; In addition, the first end of external regulating resistance Radj also is connected with the emitter of the first triode BJT1, the base stage of the first triode BJT1 is connected with current multiplier VTM, the collector electrode of the first triode BJT1 is connected with the negative pole of load LED lamp 300, and the positive pole of load LED lamp 300 and positive source connect to form the regulation and control loop; Electric current is flow through the pressure drop of external regulating resistance Radj generation as target voltage Ut, the close loop control circuit circuit feeds back the information of target voltage Ut in Voltage-controlled Current Source VCCS, the impedance of the first triode BJT1 is regulated in the closed loop gain that Voltage-controlled Current Source VCCS changes whole close loop control circuit circuit according to the information of voltage that receives, it is constant that target voltage Ut is followed, and drives thereby make the electric current that flows through the first triode BJT1 carry out constant current to load LED lamp 300 in current margin.
When current value was less than 450mA in circuit, linear constant flow module 200 can work, and converts power supply to the constant current drive source; And with the scope of the operating current of the adaptive load LED lamp 300 of the utility model LED driving power be 20mA to 450mA.
Can make whole power supply become dimming drive power at the input EN of controller CB end place input PWM format signal, make load LED lamp 300 can realize dimming function.
Using a linear constant flow module 200 to drive in the circuit of current overload, can shunt with two or more linear constant flow module 200 parallel connections and drive to satisfy larger current design requirement, and two or more linear constant flow module 200 parallel drives are conducive to power consumption heat radiation, can improve temperature tolerance, the stability of LED driving power in the circuit of high-power many group load LED lamp strings.
Like this, the parts of LED driving power are less, and circuit is simple, cost is lower, make whole LED driving power can accomplish miniaturization, modularity design, and in linear constant flow module, do not contain easily breakdown electrochemical capacitor, the useful life of having improved the LED driving power.
The above only is preferred embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure transformation that utilizes the utility model specification and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.
Claims (5)
1. LED driving power, it is characterized in that, comprise power input, the full-bridge rectification module (100) that is connected and power supply is carried out rectification with described power input, the linear constant flow module (200) that is connected and described power supply is adjusted to the constant current drive source with described full-bridge rectification module (100), described linear constant flow module (200) is connected with load LED lamp (300), be provided with first triode (BJT1) of Linear Driving in the described linear constant flow module (200), the controller of Linear Driving (CB), external regulating resistance (Radj), external resistance (Ren), be provided with the second triode (BJT2) in the described controller (CB), current multiplier (VTM), Voltage-controlled Current Source (VCCS), the input of described power supply is connected with the input (En) of described linear constant flow module (200) by behind the described external resistance (Ren), described input (En) is connected with the base stage of described the second triode (BJT2), described external resistance (Ren) make described the second triode (BJT2) thus base stage have high level to trigger described the second triode (BJT2) to make its conducting work, the collector electrode of described the second triode (BJT2) is connected with described current multiplier (VTM), and emitter is connected with the positive pole of described Voltage-controlled Current Source (VCCS); The negative pole of described Voltage-controlled Current Source (VCCS) is connected with the first end of described external regulating resistance (Radj), the other end ground connection of described external regulating resistance (Radj), the first end of described external regulating resistance (Radj) are connected with described Voltage-controlled Current Source (VCCS) by a feedback loop and have formed the close loop control circuit circuit; In addition, the first end of described external regulating resistance (Radj) also is connected with the emitter of described the first triode (BJT1), the base stage of described the first triode (BJT1) is connected with described current multiplier (VTM), the collector electrode of described the first triode (BJT1) is connected with the negative pole of described load LED lamp (300), and the positive pole of described load LED lamp (300) and described positive source connect to form the regulation and control loop; Electric current is flow through the pressure drop of described external regulating resistance (Radj) generation as target voltage (Ut), described close loop control circuit circuit feeds back the information of described target voltage (Ut) in described Voltage-controlled Current Source (VCCS), the impedance of described the first triode (BJT1) is regulated in the closed loop gain that described Voltage-controlled Current Source (VCCS) changes whole described close loop control circuit circuit according to the information of voltage that receives, it is constant that described target voltage (Ut) is followed, and drives thereby make the electric current that flows through described the first triode (BJT1) carry out constant current to described load LED lamp (300) in current margin.
2. LED driving power according to claim 1 is characterized in that, described linear constant flow module (200) can convert described power supply to the constant current drive source when current value is less than 450mA in circuit.
3. LED driving power according to claim 1 and 2 is characterized in that, with the scope of the operating current of the adaptive load LED lamp (300) of described LED driving power be 20mA to 450mA.
4. LED driving power according to claim 3 is characterized in that, locates to input the PWM format signal at the input (EN) of described controller (CB) and makes described power supply become the dimming drive power that can carry out light modulation to described load LED lamp (300).
5. LED driving power according to claim 4 is characterized in that, some described linear constant flow modules (200) parallel connection can be shunted driving when drive current transships.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220273738 CN202696962U (en) | 2012-06-12 | 2012-06-12 | Light emitting diode (LED) driving power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220273738 CN202696962U (en) | 2012-06-12 | 2012-06-12 | Light emitting diode (LED) driving power supply |
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| Publication Number | Publication Date |
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| CN202696962U true CN202696962U (en) | 2013-01-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220273738 Withdrawn - After Issue CN202696962U (en) | 2012-06-12 | 2012-06-12 | Light emitting diode (LED) driving power supply |
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| CN (1) | CN202696962U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102711331A (en) * | 2012-06-12 | 2012-10-03 | 中山市山沃照明有限公司 | LED drive power supply |
| CN103561525A (en) * | 2013-11-18 | 2014-02-05 | 北京格林曼光电科技有限公司 | Optical communication device based on white light LED illumination |
-
2012
- 2012-06-12 CN CN 201220273738 patent/CN202696962U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102711331A (en) * | 2012-06-12 | 2012-10-03 | 中山市山沃照明有限公司 | LED drive power supply |
| CN103561525A (en) * | 2013-11-18 | 2014-02-05 | 北京格林曼光电科技有限公司 | Optical communication device based on white light LED illumination |
| CN103561525B (en) * | 2013-11-18 | 2015-05-27 | 北京格林曼光电科技有限公司 | Optical communication device based on white light LED illumination |
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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 |
Granted publication date: 20130123 Effective date of abandoning: 20140806 |
|
| RGAV | Abandon patent right to avoid regrant |