CN203193958U - Constant voltage dimmable LED power supply - Google Patents
Constant voltage dimmable LED power supply Download PDFInfo
- Publication number
- CN203193958U CN203193958U CN2013200909443U CN201320090944U CN203193958U CN 203193958 U CN203193958 U CN 203193958U CN 2013200909443 U CN2013200909443 U CN 2013200909443U CN 201320090944 U CN201320090944 U CN 201320090944U CN 203193958 U CN203193958 U CN 203193958U
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- circuit
- power supply
- led power
- constant voltage
- operational amplifier
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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
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Abstract
A constant voltage dimmable LED power supply provided by the utility model comprises a primary rectifying filter circuit, a high-frequency transformer and a secondary rectifying filter circuit. The high-frequency transformer is connected between the primary rectifying filter circuit and the secondary rectifying filter circuit, and the secondary rectifying filter circuit is connected with an LED lamp. The LED power supply circuit further comprises a voltage regulating module and a feedback control circuit, and the voltage regulating module is connected with the feedback control circuit and the secondary rectifying filter circuit simultaneously. Operational amplifiers are added in the constant voltage dimmable LED power supply circuit, have the signal amplification functions, and can feed back a tiny signal change in time, and adjust the output, so that the control accuracy is high. The constant voltage dimmable LED power supply of the utility model is also equipped with an anti-interference circuit which can carry out de-noising treatment on a signal, so that an output signal is small in interference, and is pure.
Description
Technical field
The utility model relates to the LED field of power supplies, particularly a kind of constant voltage Dimmable LED power supply.
Background technology
Based on the LED light fixture incomparable advantages of many conventional light source such as energy-saving and environmental protection, toggle speed are fast are arranged, it is by wide popularization and application, and meanwhile, the demand of LED power supply is also increasing, and is also more and more higher to the quality requirements of LED power supply.
In the use of LED light fixture, we find to have the supply voltage instability through regular meeting, or power supply signal exists light flash that problem such as interference causes even the situation of shutoff.
The utility model content
For overcoming the shortcoming that present LED supply voltage is unstable and interference signal is big, the utility model provides a kind of voltage stable and adjustable, jamproof constant voltage Dimmable LED power supply.
The utility model provides a kind of constant voltage Dimmable LED power supply, comprise an elementary current rectifying and wave filtering circuit, one high frequency transformer and a level current rectifying and wave filtering circuit, high frequency transformer is connected between elementary current rectifying and wave filtering circuit and the secondary commutation filter circuit, the secondary commutation filter circuit links to each other with the LED lamp, and this LED power circuit further comprises a voltage regulating module and a feedback control circuit, and this voltage regulating module is connected with feedback control circuit, simultaneously, voltage regulating module is connected with the secondary commutation filter circuit.
Preferably, this feedback control circuit produces circuit with driving pulse and is connected, and the feedback control circuit output signal makes driving pulse produce circuit and produces driving pulse.
Preferably, between driving pulse generation circuit and high frequency transformer, be connected to a switching tube circuit.
Preferably, this elementary current rectifying and wave filtering circuit links to each other with an anti-jamming circuit, and this anti-jamming circuit is connected with an AC alternating current source, is used for the signal that the AC alternating current source produces is carried out denoising.
Preferably, this voltage regulating module comprises an operational amplifier, is connected with resistance between the inverting input of this operational amplifier and the secondary commutation filter circuit, changes resistance, can change the end of oppisite phase input value.
Preferably, the operational amplifier inside in this voltage regulating module is provided with a voltage-stabiliser tube, and this voltage-stabiliser tube is connected its in-phase input end.
Preferably, the output of operational amplifier is connected to a diode in the voltage regulating module, and this diode and feedback control circuit join.
Preferably, be connected with a current limliting module between node that the secondary commutation filter circuit is connected with the LED lamp and voltage regulating module, this current limliting module links to each other with feedback control circuit.
Preferably, the current limliting module comprises an operational amplifier, and the in-phase input end of this operational amplifier is connected the node place that the secondary commutation filter circuit is connected with the LED lamp, and the other end links to each other with the in-phase input end of the operational amplifier of voltage regulating module.
Preferably, the operational amplifier output terminal in the current limliting module is connected to a diode, and this diode links to each other with feedback control circuit.
Compared to existing technology, the utility model Dimmable LED power supply has been introduced voltage regulating module and current limliting module, realizes adjusting to the output of LED power supply by the resistance sizes of regulating voltage regulating module, namely to the adjusting of LED luminosity.The current limliting module is operated in the safe current scope it by the input of LED lamp power input and the feedback of signal are controlled the electric current that flows into the LED lamp.Because voltage regulating module and current limliting module have all been introduced operational amplifier, operational amplifier has the amplifying signal function, small signal can be changed in time to feed back, and adjust output, so, the control precision height.The utility model also is provided with anti-jamming circuit, and anti-jamming circuit can carry out denoising with signal, and it is little to make output signal reach interference, the purpose that signal is pure.
Description of drawings
Fig. 1 is a kind of constant voltage Dimmable LED of the utility model power circuit module map.
Fig. 2 is a kind of constant voltage Dimmable LED of the utility model power supply current limliting module and voltage regulating module circuit diagram.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage are clearer, below in conjunction with accompanying drawing and embodiment, the utility model are further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
See also Fig. 1, a kind of constant voltage Dimmable LED of the utility model power supply 10 comprises an AC alternating current source 11, one anti-jamming circuit 12, one elementary current rectifying and wave filtering circuit 13, one driving pulses produce circuit 14, one switching tube circuit 15, one high frequency transformer 16, level current rectifying and wave filtering circuit 17, one current limliting modules, 18, one regulating circuit 19 and a feedback control circuit 20.Signal is by 11 outputs of AC alternating current source, carry out passing to elementary current rectifying and wave filtering circuit 13 after the denoising through 12 pairs of signals of anti-jamming circuit, 13 pairs of signals of elementary current rectifying and wave filtering circuit carry out first rectification and filtering, and signal is passed to high frequency transformer 16 and driving pulse produce circuit 14, the signal of telecommunication by high frequency transformer 16 outputs to secondary commutation filter circuit 17 backs and joins with LED lamp (not shown).Node in secondary commutation filter circuit 17 and the connection of LED lamp is serially connected with current limliting module 18 successively between driving pulse generation circuit 14, voltage regulating module 19 and feedback control circuit 20, simultaneously, feedback control circuit 19 is connected with current limliting module 18, and voltage regulating module 19 joins with secondary commutation filter circuit 17.Switching tube circuit 15 is connected driving pulse and produces between circuit 14 and the high frequency transformer 16.
The signal of telecommunication that this AC alternating current source 11 is whole LED power supply 10 produces the source, and it act as the ac signal that produces a certain size.
This anti-jamming circuit 12 is connected between AC alternating current source 11 and the elementary current rectifying and wave filtering circuit 13, its function is for removing we and the unwanted frequency signal that mixes in the signal, makes signal through anti-jamming circuit 12 near our the needed optimal signal of telecommunication.
When being connected with anti-jamming circuit 12, this elementary current rectifying and wave filtering circuit 13 is connected with high frequency transformer 16, elementary current rectifying and wave filtering circuit 13 carries out elementary rectification by bridge circuit etc. to signal, and the signal after the rectification is carried out filtering handle the signal of unnecessary frequency in the filtered signal.
The undesirable mutual electromagnetic inductance of the generation between primary coil and the secondary coil of utilizing this high frequency transformer 16 realizes the variation to voltage of signals, electric current or impedance, and its input connects elementary current rectifying and wave filtering circuit 13, and output connects secondary commutation filter circuit 17.
This secondary commutation filter circuit 17 connects high frequency transformer 16 and voltage regulating module 19, and the signal that high frequency transformer 16 is exported carries out rectification again and filtering, and signal is outputed to the LED lamp.
This current limliting module 18 links to each other with feedback control circuit 20 with voltage regulating module 19, links to each other with node between the LED lamp with secondary commutation filter circuit 17 again simultaneously.The maximum current that is used for restriction inflow LED light fixture of current limliting module 18.
This feedback control circuit 20 is connected the output of voltage regulating module 19 and current limliting module 18, and produce circuit 14 with driving pulse and link to each other, this circuit carries out signal feedback according to the output of voltage regulating module 19 and current limliting module 18, and feedback signal passes to driving pulse and produces circuit 14.The feedback system of this feedback control circuit 19 can be the circuit transmission, also can be coupled modes such as light/electricity.
This driving pulse circuit 14 and elementary current rectifying and wave filtering circuit 13, feedback control circuit 19 joins, the signal that produces by elementary current rectifying and wave filtering circuit 13 and feedback control circuit 19 drives this circuit generation pulse, and this pulse signal passed to switching tube circuit 15, wherein the signal that transmits of feedback control circuit 19 is by changing the pulse duration that driving pulse circuit 14 produces, and then the duty that changes switching tube circuit 15 is recently controlled the output of high frequency transformer 16.
This switching tube circuit 15 is connected driving pulse and produces between circuit 14 and the high frequency transformer 16, this switching tube circuit 15 with driving pulse produce that circuit 14 produces pulse duration carry out conducting and end, the magnetic flux that changes the primary coil of high frequency transformer 16 changes its voltage/current output size.
See also Fig. 2, feedback control circuit 20, current limliting module 18 is connected in twos with regulating circuit 19.Secondary commutation filter circuit 17 is attached thereto as the input signal of pressure limiting module 20, can adjust LED power supply 10 output voltages by the input terminal voltage that changes pressure limiting module 20.Current limliting module 18 is used for the maximum current of control input LED lamp.
This current limliting module 18 comprises an operational amplifier U1A, three resistance R 1, and R2 and R3, two capacitor C 1 and C2 and a diode D1, wherein, resistance R 3 is fine-tuning.Resistance R 3 and capacitor C 2 are connected to in-phase input end and the inverting input of operational amplifier U1A, be connected across between the inverting input and output of operational amplifier U1A after resistance R 1 and capacitor C 1 series connection, the in-phase input end of operational amplifier U1A is connected to regulating circuit 19, and its inverting input is connected to LED lamp power input after by resistance R 2.Resistance R 1, R3, capacitor C 1 and C2 constitute amplifying circuit, have the function of amplifying signal, and wherein, capacitor C 2 has filter action.But be connected diode D1 conducting when operational amplifier U1A output level is dragged down of operational amplifier U1A output, and signal is transferred to feedback control circuit 20.
This regulating circuit 19 comprises an operational amplifier U1B, seven resistance R 4, R5, R6, R7, R8, R9, R10 and R11, capacitor C 3, C4 and C5 and a diode D2, wherein resistance R 6, R7, R8 is semifixed resistor, resistance R 11 is adjustable resistance, and resistance R 6 is connected between the inverting input and secondary commutation filter circuit 17 of operational amplifier U1B after the R7 series connection, capacitor C 4 is connected between its inverting input and the ground, R11 is connected and is connected in parallel on the R7 two ends, and resistance R 8 one ends are connected between R6 and the R7, other end ground connection.Be in series with resistance R 9 and resistance R 10 between the in-phase input end of operational amplifier U1B and the secondary commutation filter circuit 17, be connected to a power supply VCC at the node place of resistance R 9 and resistance R 10, between this node and ground, be connected to a capacitor C 5, the circuit that is connected with current limliting module 18 inverting inputs by resistance R 5 at the in-phase input end of this operational amplifier U1B.Resistance R 4 and C3 are connected between the inverting input and output of operational amplifier U1B, also are connected with diode D2 at the output of operational amplifier U1B, and this diode D2 other end is connected to feedback control circuit 20.Resistance R 4, R6, R7, R8, R10, capacitor C 3, C4, C5 constitutes amplifying circuit, capacitor C 4, C5 has filter action, and resistance R 6, R7, R8 constitutes constant voltage ratio at the inverting input of operational amplifier U1B, and the resistance that changes adjustable resistance R11 can change this dividing potential drop ratio.Especially, this operational amplifier U1B inside is provided with a voltage-stabiliser tube (not shown), this voltage-stabiliser tube is connected the in-phase input end of operational amplifier U1B, resistance R 9, R10, the circuit that capacitor C 5 and the VCC that is attached thereto constitute makes its inner voltage-stabiliser tube clamper at its burning voltage for the in-phase input end of operational amplifier U1B provides voltage, for the in-phase input end of operational amplifier U1A provides a stable voltage input.
When in the use of LED lamp, needing to regulate lamplight brightness, by changing the resistance of adjustable resistance R11, change the resistance R 6 of operational amplifier U1B inverting input, R7, the voltage ratio that R8 constitutes, voltage signal is provided by secondary commutation filter circuit 17, behind the voltage ratio that changes, the inverting input voltage of operational amplifier U1B changes, its output end voltage is dragged down, and diode D2 conducting has signal to be transferred to feedback control circuit 20, feedback control circuit 20 produces the pulse duration that circuit 14 produces by changing driving pulse, further change the duty ratio of switching tube circuit, thereby change the magnetic flux of high frequency transformer 16 primary coils, change its output size, control the output size of LED power supply, namely control the luminosity of LED lamp.
In use, when the electric current of input LED lamp is excessive, the inverting input voltage of operational amplifier U1A in the current limliting module 18 increases, its in-phase input end voltage constant, so output end voltage is dragged down, diode D1 conducting, there is signal to transfer to feedback control circuit 20, reduces voltage output by signal feedback.When flowing into the LED lamp current less than the maximum permissible current value, this pressure limiting module is inoperative, and this maximum permissible current value is determined by circuit parameter.
The utility model Dimmable LED power supply 10 has been introduced voltage regulating module 19 and current limliting module 18, realizes adjusting to 10 outputs of LED power supply by resistance R 11 sizes of regulating voltage regulating module 19, namely to the adjusting of LED luminosity.Current limliting module 18 is operated in the safe current scope it by the input of LED lamp power input and the feedback of signal are controlled the electric current that flows into the LED lamp.Because voltage regulating module 19 and current limliting module 18 have all been introduced operational amplifier U1A, U1B, operational amplifier U1A, U1B have the amplifying signal function, and small signal can be changed in time to feed back, and adjust output, so, the control precision height.The utility model also is provided with anti-jamming circuit 12, and anti-jamming circuit 12 can carry out denoising with signal, and it is little to make output signal reach interference, the purpose that signal is pure.
The above only is preferred embodiment of the present utility model, and in order to limit the utility model, all any modifications of doing within principle of the present utility model are not equal to replacement and improvement etc. and all should comprise within the protection range of the present utility model.
Claims (10)
1. constant voltage Dimmable LED power supply, comprise an elementary current rectifying and wave filtering circuit, one high frequency transformer and a level current rectifying and wave filtering circuit, high frequency transformer is connected between elementary current rectifying and wave filtering circuit and the secondary commutation filter circuit, the secondary commutation filter circuit links to each other with the LED lamp, it is characterized in that: this LED power circuit further comprises a voltage regulating module and a feedback control circuit, and this voltage regulating module is connected with feedback control circuit, simultaneously, voltage regulating module is connected with the secondary commutation filter circuit.
2. constant voltage Dimmable LED power supply as claimed in claim 1 is characterized in that: this feedback control circuit produces circuit with driving pulse and is connected, and the feedback control circuit output signal makes driving pulse produce circuit generation driving pulse.
3. constant voltage Dimmable LED power supply as claimed in claim 2 is characterized in that: produce between circuit and the high frequency transformer at driving pulse and be connected to a switching tube circuit.
4. constant voltage Dimmable LED power supply as claimed in claim 1, it is characterized in that: this elementary current rectifying and wave filtering circuit links to each other with an anti-jamming circuit, and this anti-jamming circuit is connected with an AC alternating current source, is used for the signal that the AC alternating current source produces is carried out denoising.
5. constant voltage Dimmable LED power supply as claimed in claim 1, it is characterized in that: this voltage regulating module comprises an operational amplifier, be connected with resistance between the inverting input of this operational amplifier and the secondary commutation filter circuit, change resistance, can change the end of oppisite phase input value.
6. constant voltage Dimmable LED power supply as claimed in claim 5, it is characterized in that: the operational amplifier inside in this voltage regulating module is provided with a voltage-stabiliser tube, and this voltage-stabiliser tube is connected its in-phase input end.
7. constant voltage Dimmable LED power supply as claimed in claim 5, it is characterized in that: the output of operational amplifier is connected to a diode in the voltage regulating module, and this diode and feedback control circuit join.
8. constant voltage Dimmable LED power supply as claimed in claim 6 is characterized in that: be connected with a current limliting module between node that the secondary commutation filter circuit is connected with the LED lamp and voltage regulating module, this current limliting module links to each other with feedback control circuit.
9. constant voltage Dimmable LED power supply as claimed in claim 8, it is characterized in that: the current limliting module comprises an operational amplifier, the in-phase input end of this operational amplifier is connected the node place that the secondary commutation filter circuit is connected with the LED lamp, and the other end links to each other with the in-phase input end of the operational amplifier of voltage regulating module.
10. constant voltage Dimmable LED power supply as claimed in claim 9, it is characterized in that: the operational amplifier output terminal in the current limliting module is connected to a diode, and this diode links to each other with feedback control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200909443U CN203193958U (en) | 2013-02-08 | 2013-02-08 | Constant voltage dimmable LED power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200909443U CN203193958U (en) | 2013-02-08 | 2013-02-08 | Constant voltage dimmable LED power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203193958U true CN203193958U (en) | 2013-09-11 |
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ID=49110780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013200909443U Expired - Lifetime CN203193958U (en) | 2013-02-08 | 2013-02-08 | Constant voltage dimmable LED power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203193958U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107135593A (en) * | 2017-06-07 | 2017-09-05 | 深圳市奥金瑞科技有限公司 | Intelligent switch is detected and identification circuit |
| CN107770910A (en) * | 2017-10-30 | 2018-03-06 | 上海阿卡得电子有限公司 | A kind of LED is segmented multistage dimming driving circuit |
-
2013
- 2013-02-08 CN CN2013200909443U patent/CN203193958U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107135593A (en) * | 2017-06-07 | 2017-09-05 | 深圳市奥金瑞科技有限公司 | Intelligent switch is detected and identification circuit |
| CN107135593B (en) * | 2017-06-07 | 2023-12-05 | 深圳市奥金瑞科技有限公司 | Intelligent switch detection and identification circuit |
| CN107770910A (en) * | 2017-10-30 | 2018-03-06 | 上海阿卡得电子有限公司 | A kind of LED is segmented multistage dimming driving circuit |
| CN107770910B (en) * | 2017-10-30 | 2024-02-02 | 上海阿卡得电子有限公司 | LED segmentation multistage dimming driving circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Baoan District Shenzhen City manhole town of Guangdong province 518104 new road building 1801-02 star Patentee after: Shenzhen Qile handboard Model Co.,Ltd. Address before: Baoan District Shenzhen City manhole town of Guangdong province 518104 new road building 1801-02 star Patentee before: SHENZHEN HONGLINHUI TECHNOLOGY Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130911 |
|
| CX01 | Expiry of patent term |