CN201718099U - Led driving power supply - Google Patents
Led driving power supply Download PDFInfo
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- CN201718099U CN201718099U CN2010202559296U CN201020255929U CN201718099U CN 201718099 U CN201718099 U CN 201718099U CN 2010202559296 U CN2010202559296 U CN 2010202559296U CN 201020255929 U CN201020255929 U CN 201020255929U CN 201718099 U CN201718099 U CN 201718099U
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Abstract
The utility model relates to an LED driving power supply with a tertiary structure in which a voltage loop is separated from a current loop. The LED driving power supply comprises an external power input end, an EMI filter unit, a PFC boosting and voltage stabilizing unit, a separation ratio output unit and a current single-loop driving output unit, wherein the EMI filter unit is connected with the external power input end and used for restraining noise of a power grid and self-generated noise; the PFC boosting and voltage stabilizing unit is connected with the EMI filter unit and used for correcting power factor and outputting direct-current voltage; the separation ratio output unit is connected with the PFC boosting and voltage stabilizing unit and used for converting the voltage after correction of the power factor and transmitting the converted current to a current output unit; and the current single-loop driving output unit is connected with the separation ratio output unit and used for outputting constant current to a loaded LED. The efficiency, reliability and current output accuracy of the LED driving power supply can be improved.
Description
Technical field
The utility model relates to a kind of LED driving power, relates in particular to the tertiary structure LED driving power that a kind of Voltage loop and electric current loop separate.
Background technology
Present LED illumination driving power converter on the basis of conventional switch power supply, has increased the protection of some restriction electric currents usually, so the technical background of LED illumination driving power has all continued the technology of traditional Switching Power Supply.
As shown in Figure 1, be the circuit diagram of AC/DC supply convertor of the prior art.The framework that this AC/DC supply convertor adopts is the pattern of two-stage, power output all there is the requirement of strict power factor above the supply convertor of 70W, the first order is power factor correction, usually select the BOOST topological structure for use, again in conjunction with special control chip, as the control chip UC3854 of average-current mode; Another level is DC stabilization output, selects topological structures such as HALF BRIDGE, FULL BRIDGE, PHASE HIFT ZVT usually for use, again in conjunction with special control chip, waits to reach as UC3879, UC3525 and exports certain voltage, electric current.
When common employing BOOST topological circuit carried out the PFC conversion, sort circuit was to make input current waveform follow comprehensive input voltage waveform, and load converter adopts the DC/DC converter of isolating, and realized the feedback regulation of output voltage.The power factor correction circuit of BOOST structure is then owing to there is a bigger second harmonic, and for guaranteeing arranged the long retention time, need add storage capacitor, and therefore, the efficient of whole power supply is low, the circuit complexity, and poor reliability, cost is high.
The utility model content
The purpose of this utility model is to provide a kind of efficient height, reliability height, LED driving power framework that the electric current output accuracy is high.
In order to achieve the above object, the utility model provides a kind of LED driving power, comprising: an external power input; One EMI filter unit is connected with this external power input, is used to suppress electric network noise and the noise that self produces and exports filtering signal; The one PFC voltage regulation unit that boosts is connected with this EMI filter unit, is used for correcting power factors and output dc voltage; One separating ratio output unit is connected with this PFC voltage regulation unit that boosts, and is used for switching signal is changed and exported to the voltage after the power factor correction; And one the continuous current monocycle drive output unit, is connected with this separating ratio output unit, this electric current monocycle drives output unit and exports constant current to load LED.
LED driving power described in the utility model, wherein, the described PFC voltage regulation unit that boosts comprises: a PFC voltage boosting and stabilizing circuit is used for corrected power factor and output dc voltage; And a PFC control circuit, by periodically conducting and the disconnection of this PFC voltage boosting and stabilizing circuit of PWM switching controls.
LED driving power described in the utility model, wherein, described separating ratio output unit comprises: a separating ratio output circuit is the semibridge system structure of MOS switching tube formation; And one 50% duty cycle signals generator, for duty ratio is fixed as 50% PWM, the switching tube that is used to control this separating ratio output circuit is operated in the state of 50% duty ratio.
LED driving power described in the utility model, wherein, described continuous current monocycle drives output unit and comprises: an electric current monocycle drive circuit is used to export the continuous current that drives load LED; And an electric current monocycle control, protection and temperature-compensation circuit, be used to control electric current output, circuit protection and the temperature-compensating of this electric current monocycle drive circuit.
LED driving power described in the utility model, wherein, described electric current monocycle drive circuit is that BUCK drives output circuit.
LED driving power described in the utility model, wherein, the control of described electric current monocycle, protection and temperature-compensation circuit come the Control current time rate according to the empirical data curve of time and LED electric current, to realize the Current Control to LED.
LED driving power described in the utility model further, also comprises a voltage of voltage regulation bus not, described separating ratio output unit and circuit monocycle driving output unit by this not the voltage of voltage regulation bus be connected.
LED driving power described in the utility model, further, also comprise: a battery and a battery charging and discharging management circuit are used for when no external power source as power supply, by described not voltage of voltage regulation bus connection electric current monocycle driving output unit driving load LED.
By technique scheme, the beneficial effects of the utility model are:
1. with Voltage loop and separately design of electric current loop, adopt single current loop control to improve the precision and the flexibility of Control current to the driving of LED.
2. with the proportional output of DC-DC shift design, adopt feedfoward control, allow its switching tube be operated under the state of 50% duty ratio, can improve the operating efficiency of transformer, reduced the volume of transformer, realize ultra-thinization of LED driving power, also can form the continuous illumination system more easily.
3. adopt method based on the long term data statistics to realize need not the method for the Control current time rate of temperature sensor, realized temperature controlling LED light fixture equipment.
4. adopt not voltage of voltage regulation bus connection between Voltage loop and the electric current loop, can connect other elements such as battery.
5. the architecture design of the LED driving power of this invention is convenient to realize low cost, high efficiency, many LED illuminator of control flexibly.
Description of drawings
Fig. 1 is existing LED driving power schematic diagram;
Fig. 2 is that the tertiary structure that the utility model proposes drives the framework schematic diagram;
Fig. 3 is the utility model one embodiment LED driving power schematic diagram;
Fig. 4 is this embodiment LED driving power circuit figure.
Embodiment
Describe the utility model with reference to the accompanying drawings in conjunction with specific embodiments in detail.
As shown in Figure 2, the utility model provides a kind of tertiary structure to drive framework, power factor correction part and control circuit that the first order is imported EMI filtering for band exchanges, the second level is separating ratio output and ON-OFF control circuit, the third level is electric current monocycle drive part and control circuit.
As shown in Figure 3, the utility model one embodiment LED driving power comprises that boost voltage regulation unit, separating ratio output unit and continuous current monocycle of external power input, EMI filter unit, PFC drives output unit.The described PFC voltage regulation unit that boosts comprises a PFC voltage boosting and stabilizing circuit and a pwm control circuit.Described separating ratio output unit comprises a separating ratio output circuit, the semibridge system structure that it constitutes for the MOS switching tube, and one 50% duty cycle control signal generator, and it is fixed as 50% PWM for duty ratio.Described continuous current monocycle drives output unit and comprises an electric current monocycle drive circuit and an electric current monocycle control, protection and temperature-compensation circuit.Described electric current monocycle drive circuit can drive output circuit for BUCK.
Wherein, the input of EMI filter unit is connected with the external power input, be mainly used in the noise that suppresses electric network noise and self produce, eliminate electrical network to the influence of LED driving power and LED driving power to the influence of electrical network, improve the antijamming capability of LED driving power and the reliability of system.The output of EMI filter unit is connected with the input of PFC voltage boosting and stabilizing circuit, the signal correction power factor that the PFC voltage boosting and stabilizing circuit transmits the EMI filter unit and convert direct current to after export, this PFC voltage boosting and stabilizing circuit is subjected to the control signal control of connected pwm control circuit output and periodically conducting and disconnection, and thereby the voltage output of control PFC voltage boosting and stabilizing circuit.
The separating ratio output circuit drives output circuit with PFC voltage boosting and stabilizing circuit, 50% duty cycle control signal generator and BUCK and is connected, it receives the direct voltage of PFC voltage boosting and stabilizing circuit output, under the control of 50% duty cycle control signal generator, carry out voltage transitions, output by the former secondary turns of isolating transformer than decision direct voltage, constitute the open loop DC bus voltage that is lower than 36V, and the voltage after will changing outputs to BUCK and drives output circuit, drives output circuit by BUCK again and exports LED to and drive its work.The switching tube MOS of separating ratio output circuit is operated in 50% duty ratio state, transformer is operated under the maximum magnetic flux, under equal power output, the volume of transformer can be realized ultra-thinization, outputting inductance can omit, output filter capacitor reducing at double, whole operating efficiency has realized high efficiency.LED is a current-type driver spare, therefore between described separating ratio output unit and the electric current monocycle driving output unit can by one not the voltage of voltage regulation bus be connected.This can not connect a battery and a battery charging and discharging management circuit on the voltage of voltage regulation bus, is used for when no external power source as power supply, drives output unit by the electric current monocycle and directly drives load LED.
BUCK drives output circuit and controlled by the electric current monocycle; the control of protection and temperature-compensation circuit; by output current regulating being realized the light modulation of LED; temperature-compensation circuit in this control circuit; need not the temperature-compensating of temperature sampling transducer; statistics by the long-term experiment data; according to the LED light fixture under certain heat dissipation environment and power output; analyze LED housing area of dissipation and the temperature data under the temperature of varying environment and the long term data that flows through the LED electric current; make up the empirical data curve chart of time and LED electric current; realize Current Control according to this curve chart to LED; avoid the phenomenon of the local overheating of temperature sensor, also increased the convenience of using.
As shown in Figure 4, be this embodiment LED driving power circuit figure, wherein the circuit module in the frame of broken lines is respectively PFC voltage boosting and stabilizing circuit, separating ratio output circuit, electric current monocycle drive circuit, and it is available circuit; Wherein the EMI filter unit that is connected with the PFC voltage boosting and stabilizing circuit is existing EMI filter circuit, and has an ac input end; And PFC control circuit, 50% duty cycle signals generator, voltage of voltage regulation bus and the control of electric current monocycle, protection and temperature-compensation circuit are not available circuit yet, and above-mentioned physical circuit repeats no more.
The above only is preferred embodiment of the present utility model, non-limitation protection range of the present utility model, and the equivalent structure that all utilization the utility model specifications and accompanying drawing content are done changes, and all is contained in the protection range of the present utility model.
Claims (8)
1. a LED driving power is characterized in that, comprising:
One external power input;
One EMI filter unit is connected with this external power input, is used to suppress electric network noise and the noise that self produces and exports filtering signal;
The one PFC voltage regulation unit that boosts is connected with this EMI filter unit, is used for correcting power factors and output dc voltage;
One separating ratio output unit is connected with this PFC voltage regulation unit that boosts, and is used for switching signal is changed and exported to the voltage after the power factor correction; And
One continuous current monocycle drives output unit, is connected with this separating ratio output unit, and this electric current monocycle drives output unit output constant current to load LED.
2. LED driving power according to claim 1 is characterized in that, the described PFC voltage regulation unit that boosts comprises:
One PFC voltage boosting and stabilizing circuit is used for corrected power factor and output dc voltage; And
One PFC control circuit is by periodically conducting and the disconnection of this PFC voltage boosting and stabilizing circuit of PWM switching controls.
3. LED driving power according to claim 1 is characterized in that, described separating ratio output unit comprises:
One separating ratio output circuit is the semibridge system structure of MOS switching tube formation; And
One 50% duty cycle signals generator, for duty ratio is fixed as 50% PWM, the switching tube that is used to control this separating ratio output circuit is operated in the state of 50% duty ratio.
4. LED driving power according to claim 1 is characterized in that, described continuous current monocycle drives output unit and comprises:
One electric current monocycle drive circuit is used to export the continuous current that drives load LED; And
One electric current monocycle control, protection and temperature-compensation circuit are used to control electric current output, circuit protection and the temperature-compensating of this electric current monocycle drive circuit.
5. LED driving power according to claim 4 is characterized in that, described electric current monocycle drive circuit is that BUCK drives output circuit.
6. LED driving power according to claim 4 is characterized in that, the control of described electric current monocycle, protection and temperature-compensation circuit are realized Current Control to LED according to the empirical data curve of time and LED electric current.
7. according to any described LED driving power among the claim 1-6, it is characterized in that, also comprise a voltage of voltage regulation bus not, described separating ratio output unit and circuit monocycle drive output unit by this not the voltage of voltage regulation bus be connected.
8. LED driving power according to claim 7 is characterized in that, also comprises:
One battery and a battery charging and discharging management circuit are used for when no external power source as power supply, by described not voltage of voltage regulation bus connection electric current monocycle driving output unit driving load LED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202559296U CN201718099U (en) | 2010-07-07 | 2010-07-07 | Led driving power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202559296U CN201718099U (en) | 2010-07-07 | 2010-07-07 | Led driving power supply |
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| Publication Number | Publication Date |
|---|---|
| CN201718099U true CN201718099U (en) | 2011-01-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010202559296U Expired - Lifetime CN201718099U (en) | 2010-07-07 | 2010-07-07 | Led driving power supply |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103124457A (en) * | 2011-11-07 | 2013-05-29 | 马克西姆综合产品公司 | Led current control in a dimmable led illumination system |
| CN103391667A (en) * | 2012-05-12 | 2013-11-13 | 鸿科电子实业有限公司 | LED current PWM dimming module |
| CN104661386A (en) * | 2013-11-25 | 2015-05-27 | 上海航空电器有限公司 | Exponential dimming circuit with temperature compensation function |
| CN104883780A (en) * | 2015-05-19 | 2015-09-02 | 深圳创维－Rgb电子有限公司 | Multichannel dual-mode digital control LED driving circuit and LED lamp |
| CN105898945A (en) * | 2014-12-04 | 2016-08-24 | 南充市永程电子科技有限公司 | LED driving dimming transformer |
| CN110212793A (en) * | 2019-07-04 | 2019-09-06 | 恩平市西特尔电子科技有限公司 | A kind of power supply system of audio-frequency power amplifier |
| CN111083838A (en) * | 2019-12-16 | 2020-04-28 | 深圳市崧盛电子股份有限公司 | Boost following control circuit and LED driving power supply |
| CN113465594A (en) * | 2021-06-08 | 2021-10-01 | 北京自动化控制设备研究所 | Power supply for micro-electromechanical inertia measuring device and micro-electromechanical inertia measuring device |
| WO2022057400A1 (en) * | 2020-09-16 | 2022-03-24 | 英飞特电子（杭州）股份有限公司 | Led control circuit and led illumination system |
-
2010
- 2010-07-07 CN CN2010202559296U patent/CN201718099U/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103124457A (en) * | 2011-11-07 | 2013-05-29 | 马克西姆综合产品公司 | Led current control in a dimmable led illumination system |
| CN103391667A (en) * | 2012-05-12 | 2013-11-13 | 鸿科电子实业有限公司 | LED current PWM dimming module |
| CN104661386A (en) * | 2013-11-25 | 2015-05-27 | 上海航空电器有限公司 | Exponential dimming circuit with temperature compensation function |
| CN105898945A (en) * | 2014-12-04 | 2016-08-24 | 南充市永程电子科技有限公司 | LED driving dimming transformer |
| CN104883780A (en) * | 2015-05-19 | 2015-09-02 | 深圳创维－Rgb电子有限公司 | Multichannel dual-mode digital control LED driving circuit and LED lamp |
| CN104883780B (en) * | 2015-05-19 | 2017-06-23 | 深圳创维－Rgb电子有限公司 | Multichannel dual mode digital controls LED drive circuit and LED |
| CN110212793A (en) * | 2019-07-04 | 2019-09-06 | 恩平市西特尔电子科技有限公司 | A kind of power supply system of audio-frequency power amplifier |
| CN111083838A (en) * | 2019-12-16 | 2020-04-28 | 深圳市崧盛电子股份有限公司 | Boost following control circuit and LED driving power supply |
| WO2022057400A1 (en) * | 2020-09-16 | 2022-03-24 | 英飞特电子（杭州）股份有限公司 | Led control circuit and led illumination system |
| US20230144258A1 (en) * | 2020-09-16 | 2023-05-11 | Inventronics (Hangzhou), Inc. | Led control circuit and led illumination system |
| US11864291B2 (en) * | 2020-09-16 | 2024-01-02 | Inventronics (Hangzhou), Inc. | LED control circuit and LED illumination system |
| CN113465594A (en) * | 2021-06-08 | 2021-10-01 | 北京自动化控制设备研究所 | Power supply for micro-electromechanical inertia measuring device and micro-electromechanical inertia measuring device |
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Granted publication date: 20110119 |