CN205213089U - NULL of LED driver detects and starting circuit - Google Patents
NULL of LED driver detects and starting circuit Download PDFInfo
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- CN205213089U CN205213089U CN201620117750.1U CN201620117750U CN205213089U CN 205213089 U CN205213089 U CN 205213089U CN 201620117750 U CN201620117750 U CN 201620117750U CN 205213089 U CN205213089 U CN 205213089U
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- 239000003990 capacitor Substances 0.000 claims description 27
- 238000001514 detection method Methods 0.000 claims description 22
- 230000002159 abnormal effect Effects 0.000 abstract description 4
- 238000001914 filtration Methods 0.000 abstract description 3
- 230000002596 correlated effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 5
- 229910052736 halogen Inorganic materials 0.000 description 3
- 150000002367 halogens Chemical class 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000008034 disappearance Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The utility model discloses a NULL of LED driver detects and starting circuit, including electronic transformer, rectifier bridge, wave filter, booster converter, intermediate stage voltage feedback network and buck converter, the wave filter includes the 5th resistance, the 6th resistance and third electric capacity, and the one end of the 5th resistance is connected with the output of rectifier bridge, and the other end is connected with the one end of the 6th resistance and third electric capacity, the other end of the 6th resistance and the other end ground connection of third electric capacity, and rectifier bridge filtering output sense end is connected between the 5th resistance and the 6th resistance, intermediate stage voltage feedback network includes third resistance and fourth resistance, and the one end and the negative pole of the 5th diode of third resistance are connected, the one end ground connection of fourth resistance, and the busbar voltage sense terminal is connected between third resistance and fourth resistance. This scheme can avoid taking place scintillation and voltage overshoot scheduling problem, starts safelyr, can avoid taking place the abnormal conditions of being correlated with with the overvoltage, can solve the problem that interim NULL lacked.
Description
Technical Field
The utility model relates to a LED technique, especially a LED driver's alternating current input detects and starting circuit.
Background
In recent years, low voltage LED lamps are beginning to replace halogen lamps, which have been widely noticed due to their advantages of lighting effect and service life, but there is a problem that has not been solved well in application: an electronic transformer. The electronic transformer is essentially a self-oscillating resonant transformer which can transform the mains frequency alternating current into 12V voltage which is available for low-voltage halogen lamps. Because of its original design, it is intended to supply a purely resistive load such as a halogen lamp, and it requires a very large current to trigger conduction, and it is also easy to accidentally switch off an electronic transformer with a capacitive or non-linear load.
The prior art scheme employs a soft start pulse sequence of a fixed pattern for the start of the low voltage LED, which has the disadvantages of: sometimes, the external alternating current does not exist, and the soft start sequence is already started, the main switching tube of the power factor correction stage may be switched at a large duty ratio, and at this time, if the external alternating current is suddenly switched on, a large inrush current and overvoltage of a direct current bus are generated, which bring excessive stress to components in the system and damage the system. In the power-on process of the traditional low-voltage LED driving system, due to the lack of detection of alternating current input, a large voltage overvoltage condition is observed, and the system can be damaged in a serious condition.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: an ac input detection and start-up circuit for an LED driver is provided to solve the above-mentioned problems of the prior art.
The technical scheme is as follows: an alternating current input detection and starting circuit of an LED driver comprises an electronic transformer, a rectifier bridge, a filter, a boost converter, an intermediate-level voltage feedback network and a buck converter; wherein,
the filter comprises a fifth resistor R5, a sixth resistor R6 and a third capacitor C3, one end of the fifth resistor R5 is connected with the output end of the rectifier bridge, the other end of the fifth resistor R5 is connected with one end of the sixth resistor R6 and one end of the third capacitor C3, the other end of the sixth resistor R6 is grounded with the other end of the third capacitor C3, and the filter output detection end of the rectifier bridge is connected between the fifth resistor R5 and the sixth resistor R6;
the boost converter comprises a first inductor L1, a second control switch Q2, a first resistor R1, a fifth diode D5 and a first capacitor C1; two ends of the first inductor L1 are respectively connected with the output end of the rectifier bridge and the drain electrode of the second control switch Q2, two ends of the first resistor R1 are respectively connected with the ground and the source electrode of the second control switch Q2, the anode of the fifth diode D5 is connected with the drain electrode of the second control switch Q2, the cathode of the fifth diode is connected with one end of the first capacitor C1, and the other end of the first capacitor C1 is grounded;
the middle-stage voltage feedback network comprises a third resistor R3 and a fourth resistor R4, one end of the third resistor R3 is connected with the negative electrode of a fifth diode D5, one end of the fourth resistor R4 is grounded, and a bus voltage detection end is connected between the third resistor R3 and the fourth resistor R4;
the buck converter comprises a third control switch Q3, a sixth diode D6, a second resistor R2, a second inductor L2 and a second capacitor C2; the source of the third control switch Q3 is connected to one end of a second resistor R2, the other end of the second resistor R2 is grounded, the drain of the third control switch Q3 is connected to the anode of a sixth diode D6 and one end of a second capacitor C2, and two ends of the second inductor L2 are connected to the cathode of the sixth diode D6 and the other end of the second capacitor C2, respectively.
In a further embodiment, the utility model discloses still include conduction angle detection circuitry, conduction angle detection circuitry is including the comparator, burr filter, duty ratio calculation module, low pass filter and the PWM signal generator that connect gradually, the input and the rectifier bridge filtering output of comparator are connected, the output and the buck converter of PWM signal generator are connected.
Has the advantages that: the utility model discloses can avoid taking place scintillation and voltage scheduling problem that overshoots, start safer, can avoid taking place with the overvoltage relevant abnormal conditions, can solve the problem of exchanging input disappearance temporarily.
Drawings
Fig. 1 is a block diagram of the present invention.
Fig. 2 is a topological diagram of the conduction angle detection circuit of the present invention.
Detailed Description
As shown in fig. 1 and fig. 2, the ac input detection and start circuit of the LED driver of the present invention mainly includes an electronic transformer, a rectifier bridge, a filter, a boost converter, an intermediate voltage feedback network, and a buck converter.
Wherein the rectifier bridge comprises a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4.
The low-pass filter comprises a fifth resistor R5, a sixth resistor R6 and a third capacitor C3, one end of the fifth resistor R5 is connected with the output end of the rectifier bridge, the other end of the fifth resistor R5 is connected with one ends of the sixth resistor R6 and the third capacitor C3, and the other end of the sixth resistor R6 is grounded with the other end of the third capacitor C3; the rectifier bridge filter output detection end is connected between the fifth resistor R5 and the sixth resistor R6.
The boost converter comprises a first inductor L1, a second control switch Q2, a first resistor R1, a fifth diode D5 and a first capacitor C1; two ends of the first inductor L1 are respectively connected with the output end of the rectifier bridge and the drain electrode of the second control switch Q2, two ends of the first resistor R1 are respectively connected with the ground and the source electrode of the second control switch Q2, the anode of the fifth diode D5 is connected with the drain electrode of the second control switch Q2, the cathode of the fifth diode is connected with one end of the first capacitor C1, and the other end of the first capacitor C1 is grounded.
The middle-stage voltage feedback network comprises a third resistor R3 and a fourth resistor R4, one end of the third resistor R3 is connected with the negative electrode of a fifth diode D5, one end of the fourth resistor R4 is grounded, and a bus voltage detection end is connected between the third resistor R3 and the fourth resistor R4.
The buck converter comprises a third control switch Q3, a sixth diode D6, a second resistor R2, a second inductor L2 and a second capacitor C2; the source of the third control switch Q3 is connected to one end of a second resistor R2, the other end of the second resistor R2 is grounded, the drain of the third control switch Q3 is connected to the anode of a sixth diode D6 and one end of a second capacitor C2, and two ends of the second inductor L2 are connected to the cathode of the sixth diode D6 and the other end of the second capacitor C2, respectively.
As shown in fig. 2, the utility model discloses still include conduction angle detection circuitry, conduction angle detection circuitry is including the comparator, burr filter, duty ratio calculation module, low pass filter and the PWM signal generator that connect gradually, the input and the rectifier bridge filtering output of comparator are connected, the output and the buck converter of PWM signal generator are connected.
When the power supply works, a signal at the output end of the rectifier bridge is detected through the filter output detection end of the rectifier bridge, whether an alternating current power supply exists or not is judged, and if the alternating current power supply exists, the driving power supply is started within a preset time; and detecting a signal capable of representing the bus voltage through a bus voltage detection end, calculating a conduction angle and setting a PWM signal in a starting process. At the same time, according to the signal V capable of representing the medium bus voltageFBAnd the timer determines whether the soft start process is finished or abnormal, and if the abnormal occurs, the soft start process is initialized again.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the details of the above embodiments, and the technical concept of the present invention can be modified to perform various equivalent transformations, which all belong to the protection scope of the present invention.
Claims (2)
1. An alternating current input detection and starting circuit of an LED driver is characterized by comprising an electronic transformer, a rectifier bridge, a filter, a boost converter, an intermediate-stage voltage feedback network and a buck converter; wherein,
the filter comprises a fifth resistor R5, a sixth resistor R6 and a third capacitor C3, one end of the fifth resistor R5 is connected with the output end of the rectifier bridge, the other end of the fifth resistor R5 is connected with one ends of the sixth resistor R6 and the third capacitor C3, and the other end of the sixth resistor R6 is grounded with the other end of the third capacitor C3; the detection end of the filter output of the rectifier bridge is connected between the fifth resistor R5 and the sixth resistor R6;
the boost converter comprises a first inductor L1, a second control switch Q2, a first resistor R1, a fifth diode D5 and a first capacitor C1; two ends of the first inductor L1 are respectively connected with the output end of the rectifier bridge and the drain electrode of the second control switch Q2, two ends of the first resistor R1 are respectively connected with the ground and the source electrode of the second control switch Q2, the anode of the fifth diode D5 is connected with the drain electrode of the second control switch Q2, the cathode of the fifth diode is connected with one end of the first capacitor C1, and the other end of the first capacitor C1 is grounded;
the middle-stage voltage feedback network comprises a third resistor R3 and a fourth resistor R4, one end of the third resistor R3 is connected with the negative electrode of a fifth diode D5, one end of the fourth resistor R4 is grounded, and a bus voltage detection end is connected between the third resistor R3 and the fourth resistor R4;
the buck converter comprises a third control switch Q3, a sixth diode D6, a second resistor R2, a second inductor L2 and a second capacitor C2; the source of the third control switch Q3 is connected to one end of a second resistor R2, the other end of the second resistor R2 is grounded, the drain of the third control switch Q3 is connected to the anode of a sixth diode D6 and one end of a second capacitor C2, and two ends of the second inductor L2 are connected to the cathode of the sixth diode D6 and the other end of the second capacitor C2, respectively.
2. The ac input detection and start-up circuit of an LED driver of claim 1, further comprising a conduction angle detection circuit, wherein the conduction angle detection circuit comprises a comparator, a glitch filter, a duty cycle calculation module, a low pass filter and a PWM signal generator connected in sequence, an input terminal of the comparator is connected to a bridge filter output, and an output terminal of the PWM signal generator is connected to a buck converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620117750.1U CN205213089U (en) | 2016-02-05 | 2016-02-05 | NULL of LED driver detects and starting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620117750.1U CN205213089U (en) | 2016-02-05 | 2016-02-05 | NULL of LED driver detects and starting circuit |
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| CN205213089U true CN205213089U (en) | 2016-05-04 |
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| CN201620117750.1U Active CN205213089U (en) | 2016-02-05 | 2016-02-05 | NULL of LED driver detects and starting circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105554963A (en) * | 2016-02-05 | 2016-05-04 | 江苏力行电力电子科技有限公司 | Alternating current input detection and starting circuit for LED (Light Emitting Diode) driver and LED driving method |
| CN105848351A (en) * | 2016-05-09 | 2016-08-10 | 陈文军 | Compatible LED circuit |
-
2016
- 2016-02-05 CN CN201620117750.1U patent/CN205213089U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105554963A (en) * | 2016-02-05 | 2016-05-04 | 江苏力行电力电子科技有限公司 | Alternating current input detection and starting circuit for LED (Light Emitting Diode) driver and LED driving method |
| CN105848351A (en) * | 2016-05-09 | 2016-08-10 | 陈文军 | Compatible LED circuit |
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