CN203984733U - A kind of drive circuit of LED lighting device - Google Patents
A kind of drive circuit of LED lighting device Download PDFInfo
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- CN203984733U CN203984733U CN201420342106.5U CN201420342106U CN203984733U CN 203984733 U CN203984733 U CN 203984733U CN 201420342106 U CN201420342106 U CN 201420342106U CN 203984733 U CN203984733 U CN 203984733U
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Abstract
The utility model discloses a kind of drive circuit of LED lighting device, comprise AC power, dimmer, transformer and adjusting control circuit, adjusting control circuit comprises: filter unit; Rectification unit; Boost converter unit; Voltage Feedback control circuit unit; Step-down controller unit; Digital control unit, connect respectively boost converter unit, Voltage Feedback control circuit unit and step-down controller unit, the size of current of LED lighting device is relevant to the voltage that light modulation position and the light modulation position P1 of living in of dimmer are ordered, voltage and ripple voltage that after digital control unit boosts according to boost converter unit, P1 is ordered are adjusted the required size of current in step-down controller unit automatically, thereby dynamic equilibrium input power and power output, make LED lighting device not occur the phenomenon of flicker.The utility model LED lighting device can directly be replaced traditional lighting MR16 light source, easy for installation and compatible existing dimmer and electronic transformer or inductive transformer.
Description
Technical field
The utility model relates to LED lighting technical field, particularly a kind of drive circuit of LED lighting device.
Background technology
LED due to have energy-saving and environmental protection, can be light-operated, the lot of advantages such as solidification, long-life, in the today of advocating low-carbon (LC) life, be widely used in various lighting fields.
In the prior art, the holder structure of LED lamp is generally designed to the holder structure identical with original illuminating lamp such as incandescent lamp, electricity-saving lamp, LED lamp directly can be replaced like this to original illuminating lamp, is not only convenient to install, and does not change the structure of original illuminator.
But LED lamp is directly replaced after original illuminating lamp, the dimming function of the LED lamp after replacement cannot be brought into play, if LED lamp is carried out to light modulation, must in original illuminator, access in addition dimmer, so just increased the use cost of LED lamp, and when mounted LED lamp, also need professional installation personnel that dimmer is installed, install complicated.
Utility model content
The utility model has overcome above-mentioned the deficiencies in the prior art, provides a kind of without changing the drive circuit of working as front lighting device and layout, directly replacing the LED lighting device of traditional lighting light source, easy for installation, compatible existing dimmer and transformer.
The technical solution of the utility model is achieved in that
A drive circuit for LED lighting device, comprises AC power, dimmer, transformer and adjusting control circuit, and described adjusting control circuit comprises:
Filter unit, for carrying out the voltage signal of transformer output to export after filtering;
Rectification unit, the signal of the unit output that accepts filter is also rectified into direct current signal, then output;
Boost converter unit, receives the signal that rectification unit is exported, and voltage is increased to needed direct voltage;
Voltage Feedback control circuit unit, the voltage that boost converter unit is raise is controlled;
Step-down controller unit, the voltage transitions that boost converter unit is raise becomes the needed voltage and current of LED lighting device;
Digital control unit, connect respectively boost converter unit, Voltage Feedback control circuit unit and step-down controller unit, the size of current of LED lighting device is relevant to the voltage that light modulation position and the light modulation position P1 of living in of dimmer are ordered, voltage and ripple voltage that after digital control unit boosts according to boost converter unit, P1 is ordered are adjusted the required size of current in step-down controller unit automatically, thereby dynamic equilibrium input power and power output, make LED lighting device not occur the phenomenon of flicker.
As preferably, described adjusting control circuit also comprises: voltage detection unit, connect respectively digital control unit and step-down controller unit, for sampling P1 point voltage be converted into that noiselessness disturbs and the analog voltage signal of level and smooth changed step-down controller elements reference magnitude of voltage.
As preferably, described adjusting control circuit also comprises: input current control unit, connect respectively rectification unit and digital control unit, size for control inputs electric current, when P1 point voltage is reduced to while approaching the minimum conducting voltage of LED lighting device, digital control unit can be opened input current control unit, thereby further auxiliary light modulation process makes whole light modulation process more level and smooth.
As preferably, described adjusting control circuit also comprises auxiliary line, described auxiliary line comprises field effect transistor, the grid of field effect transistor connects digital control unit, the drain electrode of field effect transistor connects P1 point by resistance, and the source ground of field effect transistor, when P1 point voltage is reduced to while approaching the minimum conducting voltage of LED lighting device, digital control unit drives signal to high level of field effect transistor, makes to provide a fictitious load under low-voltage.
Adopted principle of the present utility model and the beneficial effect of technique scheme to be:
Compared to prior art, the utility model is without changing when front lighting device and layout, LED lighting device can directly be replaced traditional lighting (incandescent lamp, tungsten halogen lamp) MR16 light source, easy for installation and compatible existing dimmer and electronic transformer or inductive transformer.
The utility model adopts the mode of the step-down again of first boosting to make LED in the very large segment limit of dimmer, realize light modulation, except strengthening dimming behavior, can also strengthen the compatibility with electronic transformer like this.
The utility model is adjusted into the required size of current in step-down controller unit automatically by P1 point voltage signal, thereby dynamic equilibrium input power (that is: transformer power output) and power output (that is: the power of LED lighting device), make LED lighting device not occur flicker or the malfunctioning phenomenon of light modulation.
Specifically, the utility model is defined as P1 point by the light modulation position of dimmer, the voltage sample that the introducing of digital control unit is ordered to P1, and identify P1 point voltage ripple, if P1 voltage ripple is too large, the P1 point voltage fluctuation that can cause voltage detection unit to detect is too large, thereby cause, sends the spread of voltage of step-down controller unit to and makes the flicker of LED lighting device; If voltage ripple is more than or equal to set point, digital control unit sends a signal to step-down controller unit by continuing, and makes it change electric current, until P1 point voltage ripple drops in setting range.
Accompanying drawing explanation
Fig. 1 is the driving circuit structure block diagram of the utility model LED lighting device;
Fig. 2 is the FB(flow block) of the dimming controlling method of the utility model LED lighting device;
Fig. 3 is view when voltage ripple is greater than set point in embodiment;
Fig. 4 is view when voltage ripple is less than set point in embodiment.
Embodiment
Embodiment of the present utility model is as follows:
Embodiment: Fig. 1 is the driving circuit structure block diagram of the utility model LED lighting device, and the drive circuit of the utility model LED lighting device is the LED drive circuit of while compatible electronic inductive transformer and phase-cut dimming device.As shown in Figure 1, the drive circuit of the utility model LED lighting device comprises AC power, dimmer, transformer and adjusting control circuit, wherein, AC power, dimmer and transformer are existing control structures in the market, the main utility model point of LED drive circuit of the present utility model is adjusting control circuit below, and described adjusting control circuit comprises:
Filter unit, for carrying out the voltage signal of transformer output to export after filtering;
Rectification unit, the signal of the unit output that accepts filter is also rectified into direct current signal, then output;
Boost converter unit, receives the signal that rectification unit is exported, and voltage is increased to needed direct voltage;
Voltage Feedback control circuit unit, the voltage that boost converter unit is raise is controlled;
Step-down controller unit, the voltage transitions that boost converter unit is raise becomes the needed voltage and current of LED lighting device;
Digital control unit, connect respectively boost converter unit, Voltage Feedback control circuit unit and step-down controller unit, the size of current of LED lighting device is relevant to the voltage that light modulation position and the light modulation position P1 of living in of dimmer are ordered, voltage and voltage ripple that after digital control unit boosts according to boost converter unit, P1 is ordered are adjusted the required size of current in step-down controller unit automatically, thereby dynamic equilibrium input power and power output, make LED lighting device not occur the phenomenon of flicker.
Described adjusting control circuit also comprises: voltage detection unit, connect respectively digital control unit and step-down controller unit, for sampling P1 point voltage be converted into that noiselessness disturbs and the analog voltage signal of level and smooth changed step-down controller elements reference magnitude of voltage.
Input current control unit, connect respectively rectification unit and digital control unit, size for control inputs electric current, when P1 point voltage is reduced to while approaching the minimum conducting voltage of LED lighting device, digital control unit can be opened input current control unit, thereby further auxiliary light modulation process makes whole light modulation process more level and smooth.
Auxiliary line Q3, described auxiliary line Q3 comprises field effect transistor, the grid of field effect transistor connects digital control unit, the drain electrode of field effect transistor connects P1 point by resistance, the source ground of field effect transistor, when P1 point voltage is reduced to while approaching the minimum conducting voltage of LED lighting device, digital control unit drives signal to high level of field effect transistor, makes to provide a fictitious load under low-voltage.
The drive circuit works process of the utility model LED lighting device is as follows: first filter unit carries out the voltage signal of transformer output inputing to rectification unit after filtering and be rectified into direct current signal, then export to boost converter unit and by boost converter unit, voltage is increased to needed direct voltage, the voltage of its rising is by Voltage Feedback control circuit unit controls, and then step-down controller unit becomes the needed voltage and current of LED lighting device by voltage transitions.
The utility model adjusting control circuit brightness adjustment control process is as follows:
When dimmer carries out brightness adjustment control to LED lighting device, its light modulation position is in P1 point, after first boost converter unit being raise, voltage P1 point voltage is sampled, deliver to voltage detection unit, the signal of voltage detection unit after to P1 point sampling processed, and sending step-down controller unit to after received voltage signal is processed, step-down controller unit is controlled the electric current of LED lighting device after receiving dim signal.
Digital control unit is equally by the voltage sample that P1 is ordered simultaneously, digital control unit is mainly identification P1 point voltage ripple, if P1 voltage ripple is too large, the voltage fluctuation that can cause voltage detection unit to detect is too large, thereby cause, sends the spread of voltage of step-down controller unit to and makes the flicker of LED lighting device.
As described in Figure 3, if voltage ripple is more than or equal to set point, digital control unit sends a signal to step-down controller unit by continuing, and makes it change electric current, as shown in Figure 4, until P1 point voltage ripple drops in setting range.The size of current of LED lighting device is relevant to the voltage that light modulation position and the P1 of dimmer are ordered, the voltage that digital control unit and voltage detection unit are ordered according to P1 and voltage ripple are adjusted the required size of current in step-down controller unit automatically, thereby dynamic equilibrium input power (that is: transformer power output) and power output (that is: the power of LED lighting device), make LED lighting device not occur the phenomenon of flicker.
Voltage detection unit receives P1 point sampling signal and after inner filtering is processed, sampled signal is removed to noise jamming, reduce the low-frequency ripple of sampled signal, and be converted to that noiselessness disturbs and level and smooth analog voltage signal send step-down controller unit to, this analog control voltage signal directly can change the reference voltage level of step-down controller unit output current, when the reference voltage level of the output current of step-down dress parallel operation control unit changes, output current also can change accordingly, thereby the electric current of LED lighting device is controlled.
When input current control unit detects input current and is less than current setting value in addition, current control unit can be opened internal wiring, automatically makes input current maintain set point, makes under low-light level, and dimmer can continue conducting, improves light modulation flicker problem.
Digital control unit simultaneously can be by P1 point voltage is detected, and when P1 point voltage is reduced to while approaching the minimum conducting voltage of LED, digital control unit can be opened input current control unit; Digital control unit carrys out control inputs size of current with this, and further auxiliary light modulation process makes whole light modulation process more level and smooth.
Digital control unit is also controlled auxiliary line Q3 simultaneously, and equally when P1 point voltage is reduced to while approaching the minimum conducting voltage of LED, digital control unit drives signal to one of the field effect transistor of auxiliary line Q3, and making provides a fictitious load in low-voltage.Digital control unit drives signal to one of input current control unit simultaneously, is controlled at input current control unit under low-voltage and opens, and makes dimmer when low-light level position, further improves light modulation flicker problem.
Fig. 2 is the FB(flow block) of the dimming controlling method of the utility model LED lighting device, and as shown in Figure 2, the process step that the utility model drives is as follows:
Step 310: open LED lighting device mains switch;
Step 311: when dimmer carries out brightness adjustment control to LED lighting device, the voltage that after first boost converter unit 3 voltages being raise, corresponding P1 is ordered is sampled;
Step 312: the voltage sample that digital control unit is ordered to P1 is also identified P1 point voltage ripple, if P1 point voltage ripple is more than or equal to set point, digital control unit will continue to transmit control signal to step-down controller unit, make it change electric current, until P1 point voltage ripple drops to below set point;
Step 313: when input current control unit detects input current and is less than current setting value, input current control unit can be opened internal wiring, automatically makes input current maintain set point, makes under low-light level, dimmer can continue conducting, improves light modulation flicker problem;
Step 314: when P1 point voltage is reduced to while approaching the minimum conducting voltage of LED lighting device, digital control unit drives signal to high level of field effect transistor, makes to provide a fictitious load under low-voltage.
The utility model preferred embodiment is just for helping to set forth the utility model.Preferred embodiment does not have all details of detailed descriptionthe, and also not limiting this utility model is only described embodiment.Obviously, according to the content of this specification, can make many modifications and variations.These embodiment are chosen and specifically described to this specification, is in order to explain better principle of the present utility model and practical application, thereby under making, technical field technical staff can utilize the utility model well.The utility model is only subject to the restriction of claims and four corner and equivalent.Disclosed is above only several specific embodiments of the application, but the application is not limited thereto, and the changes that any person skilled in the art can think of, all should drop in the application's protection range.
Claims (4)
1. a drive circuit for LED lighting device, comprises AC power, dimmer, transformer and adjusting control circuit, it is characterized in that: described adjusting control circuit comprises:
Filter unit, for carrying out the voltage signal of transformer output to export after filtering;
Rectification unit, the signal of the unit output that accepts filter is also rectified into direct current signal, then output;
Boost converter unit, receives the signal that rectification unit is exported, and voltage is increased to needed direct voltage;
Voltage Feedback control circuit unit, the voltage that boost converter unit is raise is controlled;
Step-down controller unit, the voltage transitions that boost converter unit is raise becomes the needed voltage and current of LED lighting device;
Digital control unit, connect respectively boost converter unit, Voltage Feedback control circuit unit and step-down controller unit, the size of current of LED lighting device is relevant to the voltage that light modulation position and the light modulation position P1 of living in of dimmer are ordered, voltage and voltage ripple that after digital control unit boosts according to boost converter unit, P1 is ordered are adjusted the required size of current in step-down controller unit automatically, thereby dynamic equilibrium input power and power output, make LED lighting device not occur the phenomenon of flicker.
2. the drive circuit of a kind of LED lighting device according to claim 1, it is characterized in that: described adjusting control circuit also comprises: voltage detection unit, connect respectively digital control unit and step-down controller unit, for sampling P1 point voltage be converted into that noiselessness disturbs and the analog voltage signal of level and smooth changed step-down controller elements reference magnitude of voltage.
3. the drive circuit of a kind of LED lighting device according to claim 1, it is characterized in that: described adjusting control circuit also comprises: input current control unit, connect respectively rectification unit and digital control unit, size for control inputs electric current, when P1 point voltage is reduced to while approaching the minimum conducting voltage of LED lighting device, digital control unit can be opened input current control unit, thereby further auxiliary light modulation process makes whole light modulation process more level and smooth.
4. the drive circuit of a kind of LED lighting device according to claim 1, it is characterized in that: described adjusting control circuit also comprises auxiliary line, described auxiliary line comprises field effect transistor, the grid of field effect transistor connects digital control unit, the drain electrode of field effect transistor connects P1 point by resistance, the source ground of field effect transistor, when P1 point voltage is reduced to while approaching the minimum conducting voltage of LED lighting device, digital control unit drives signal to high level of field effect transistor, makes to provide a fictitious load under low-voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420342106.5U CN203984733U (en) | 2014-06-24 | 2014-06-24 | A kind of drive circuit of LED lighting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420342106.5U CN203984733U (en) | 2014-06-24 | 2014-06-24 | A kind of drive circuit of LED lighting device |
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| CN203984733U true CN203984733U (en) | 2014-12-03 |
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| CN201420342106.5U Expired - Fee Related CN203984733U (en) | 2014-06-24 | 2014-06-24 | A kind of drive circuit of LED lighting device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104066247A (en) * | 2014-06-24 | 2014-09-24 | 浙江生辉照明有限公司 | Drive circuit and dimming control method for LED lighting device |
| US9781786B2 (en) | 2015-01-28 | 2017-10-03 | Richtek Technology Corp. | Control circuit and method of a LED driver |
| CN110167235A (en) * | 2019-06-12 | 2019-08-23 | 深圳市银色星空光电科技有限公司 | A kind of buck method, apparatus of low-pressure lamp, low pressure lamp apparatus and its system |
-
2014
- 2014-06-24 CN CN201420342106.5U patent/CN203984733U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104066247A (en) * | 2014-06-24 | 2014-09-24 | 浙江生辉照明有限公司 | Drive circuit and dimming control method for LED lighting device |
| WO2015196863A1 (en) * | 2014-06-24 | 2015-12-30 | Zhejiang Shenghui Lighting Co., Ltd. | Power circuit and diming control method for led lighting device |
| US9826584B2 (en) | 2014-06-24 | 2017-11-21 | Zhejiang Shenghui Lighting Co., Ltd | Power circuit and diming control method for LED lighting device |
| US9781786B2 (en) | 2015-01-28 | 2017-10-03 | Richtek Technology Corp. | Control circuit and method of a LED driver |
| CN110167235A (en) * | 2019-06-12 | 2019-08-23 | 深圳市银色星空光电科技有限公司 | A kind of buck method, apparatus of low-pressure lamp, low pressure lamp apparatus and its system |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141203 Termination date: 20190624 |