CN109618448B - Multi-mode LED drive circuit - Google Patents
Multi-mode LED drive circuit Download PDFInfo
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- CN109618448B CN109618448B CN201811509466.9A CN201811509466A CN109618448B CN 109618448 B CN109618448 B CN 109618448B CN 201811509466 A CN201811509466 A CN 201811509466A CN 109618448 B CN109618448 B CN 109618448B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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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]
Abstract
A multi-mode LED driving circuit comprises an input module, a power protection module, a filtering module, a constant current module, a signal identification module and an output filtering module. The input module and the power protection module can be compatible with a Type B substitution mode in the prior art, and can prevent the leakage of an alternating current signal source; and the signal identification module is used for judging that the alternating current signal of the alternating current signal source is high-frequency or low-frequency and sending out a corresponding first enabling signal to control the power protection module to remove or maintain the protection function, so that the alternating current signal source can be switched to a Type A alternative mode compatible with the prior art.
Description
Technical Field
The invention relates to a multi-mode LED drive circuit, in particular to a multi-mode LED drive circuit compatible with multiple modes.
Background
In the past lighting market, CFL lamp tube products are largely used and corresponding electronic ballasts are installed. Nowadays, Light Emitting Diode (LED) lamps are used instead of conventional CFL tubes, wherein the existing alternatives are divided into the following two types:
firstly, a Type A mode is adopted, in the terminal application of the installed electronic ballast, the wiring does not need to be laid out again, extra labor cost is avoided, and the efficiency of the LED driving power supply is low. In addition, the Type A mode also can not satisfy the requirement that the double-end advances electric LED fluorescent tube to electric leakage problem and the dual potential safety hazard of falling thereupon.
Two, adopt Type B mode (the bi-polar advances the electricity), this mode can avoid electrocuteeing and the dual potential safety hazard of falling therewith through power protection circuit, but need get rid of or the current electronic ballast of bypass, and the application of incompatible electronic ballast needs rewiring replacement LED fluorescent tube, and this will bring extra cost of labor and cost.
Therefore, it is an urgent task for the various industries to provide a multi-mode LED driving circuit that is compatible with the conventional electronic ballast in the Type a mode and simultaneously satisfies the application of the double-ended power-in T-tube in the Type B mode.
Disclosure of Invention
In view of the defects in the prior art, the main object of the present invention is to provide a multi-mode LED driving circuit that is compatible with the conventional electronic ballast by the TypeA method, and simultaneously satisfies the application of the dual-terminal power-on T-tube by the TypeB method.
In order to achieve the above and other objects, the present invention provides a multi-mode LED driving circuit, which includes an input module, a power protection module, a filtering module, a constant current module, a signal identification module, and an output filtering module.
The input module is connected with an alternating current signal source and used for sending alternating current signals and rectified direct current signals; the power supply protection module is connected with the input module and used for preventing the leakage of the alternating current signal source and has a protection function; the filtering module is connected with the input module and used for receiving and transmitting the direct current signal; the constant current module is connected with the filtering module and used for receiving the direct current signal and sending a constant current signal according to the direct current signal; the signal identification module is connected with the input module and used for sending a first enabling signal with high level when the received alternating current signal is high frequency and sending a first enabling signal with low level when the received alternating current signal is low frequency; one end of the output filtering module is connected with the constant current module, and the other end of the output filtering module is connected with an LED load, so that the LED load works when the constant current signal is received; the power protection module is further configured to receive the first enable signal, disable the protection function when the first enable signal is at a high level, and maintain the protection function when the first enable signal is at a low level.
In an embodiment, the power protection module further includes a low impedance switch tube, the power protection module removes the protection function when the low impedance switch tube is turned on, and the power protection module maintains the protection function when the low impedance switch tube is turned off.
In an embodiment, the power protection module is further configured to detect an impedance of the input module, and further convert the first enable signal into a control signal to control the low impedance switch tube to be turned on or off.
In one embodiment, the power protection module further includes a crosstalk prevention detection circuit, a start circuit, a reference circuit, a control logic circuit, and a driving circuit.
In one embodiment, the anti-crosstalk detection circuit further comprises an enabling circuit, an envelope generating circuit, an impedance detection circuit and a time shielding circuit.
In an embodiment, the signal identification module further includes a sampling circuit and a frequency discrimination circuit, the sampling circuit is configured to sample the ac signal and send the ac signal to the frequency discrimination circuit, and the frequency discrimination circuit is configured to determine a frequency of the ac signal and send a corresponding first enable signal according to the frequency.
In one embodiment, the sampling circuit further includes a signal detection voltage-dividing resistor, and the frequency discrimination circuit further includes a comparator circuit, a counter circuit, and a detection time window control circuit.
In one embodiment, when the alternating current signal is high frequency, the signal identification module judges that the alternating current signal source is an electronic ballast and sends a first enable signal with high level.
In an embodiment, when the ac signal is a low frequency signal, the signal identification module determines that the ac signal source is a commercial power signal, and sends a first enable signal of a low level.
Compared with the prior art, the multi-mode LED driving circuit has the input module and the power protection module, can be compatible with a Type B substitution mode in the prior art, can prevent the problem of low electric leakage of a lamp tube, is further provided with the signal detection module, can judge the Type of an alternating current signal source to switch the compatible mode, can be compatible with a Type A substitution mode in the prior art, and does not need to remove an electronic ballast of a T-tube lamp or re-arrange and wire, so that the multi-mode LED driving circuit can meet the integrated design requirement of Type A and B, namely is compatible with a traditional electronic ballast, simultaneously meets a double-end power-in T tube and avoids electric leakage, reduces the system cost, and fully overcomes the problems in the prior art.
Drawings
Fig. 1 is a schematic diagram of a multi-mode LED driving circuit according to a first embodiment of the invention.
Fig. 2 is a schematic diagram of a multi-mode LED driving circuit according to a second embodiment of the invention.
Fig. 3 is a schematic structural diagram of a signal identification module according to a third embodiment of the present invention.
Fig. 4 is a schematic diagram of a power protection module according to a fourth embodiment of the invention.
Description of the symbols
10 input module
11 power supply protection module
110 anti-crosstalk detection circuit
1100 enable circuit
1101 impedance detection circuit
1102 envelope generation circuit
1103 time shielding circuit
111 starting circuit
112 reference circuit
113 control logic circuit
114 driving circuit
12 filtering module
13 constant current module
14 signal identification module
140 sampling circuit
1400 signal detection divider resistor
141 frequency discriminator
1410 comparator circuit
1411 counting circuit
1412 detection time window control circuit
15 output filter module
20 AC signal source
21 LED load
C1 capacitance
CMP1 first comparator
CMP2 second comparator
CMP3 third comparator
The CMP _ OUT signal
On first enable signal
GATE signal
Ic current source
ICSEnvelope current
M1 low-impedance switch tube
RCSResistance (RC)
T0 time window
Real signal of trig
VCSVoltage signal
VREFReference electricityPress and press
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways.
Referring to fig. 1, fig. 1 is a schematic diagram of a multi-mode LED driving circuit according to a first embodiment of the invention. As shown in the figure, the present invention provides a multi-mode LED driving circuit, which includes an input module 10, a power protection module 11, a filtering module 12, a constant current module 13, a signal identification module 14, and an output filtering module 15.
The input module 10 is connected with an alternating current signal source 20 and used for sending alternating current signals and rectified direct current signals; the power protection module 11 is connected with the input module 10, and is used for preventing the alternating current signal source 20 from electric leakage and having a protection function; the filtering module 12 is connected to the input module 10 for receiving and transmitting the dc signal; the constant current module 13 is connected with the filtering module 12 and used for receiving the direct current signal and sending a constant current signal according to the direct current signal; the signal identification module 14 is connected to the input module 10, and is configured to send a first enable signal at a high level when the received ac signal is at a high frequency, and send a first enable signal at a low level when the received ac signal is at a low frequency; one end of the output filtering module 15 is connected with the constant current module 13, and the other end is connected with an LED load 21, so that the LED load 21 can work when the constant current signal is received; the power protection module 11 is further configured to receive the first enable signal, disable the protection function when the first enable signal is at a high level, and maintain the protection function when the first enable signal is at a low level.
Note that the ac signal is a high frequency signal or a low frequency signal, and the high frequency signal may refer to an ac signal with a frequency greater than 10kHz, such as a signal from an electronic ballast, for example; and the low frequency signal may refer to an ac signal with a frequency less than 100Hz, such as a signal from the mains, but not limited thereto, and may be other high frequency or low frequency ranges in other embodiments.
In an embodiment, the ac signal source 20 is a signal (Type a mode) from the electronic ballast, the fault ac signal is a high frequency, the signal identification module 14 determines that the ac signal source 20 is the electronic ballast, and the signal identification module 14 sends a first enable signal with a high level to enable the power protection module 11 to remove the protection function, so as to cooperate with the Type a mode. In another embodiment, the ac signal source 20 is a signal from the commercial power (Type B mode), the fault ac signal is a low frequency, the signal identification module 14 determines that the ac signal source 20 is the commercial power signal, and the signal identification module 14 sends a first enable signal with a low level to enable the power protection module 11 to maintain the protection function, so as to cooperate with the Type B mode. Therefore, the multi-mode LED driving circuit can meet the integrated design requirement of Type A & B.
Referring to fig. 2, fig. 2 is a schematic diagram of a multi-mode LED driving circuit according to a second embodiment of the present invention. As shown, the signal identification module 14 further includes a sampling circuit 140 and a frequency discrimination circuit 141. In one embodiment, the sampling circuit 140 is used for sampling the ac signal converted by the input module 10, and the frequency discrimination circuit 141 is used for determining whether the ac signal is high frequency or low frequency, sending a first enable signal with a high level when the ac signal is high frequency, and sending a first enable signal with a low level when the ac signal is low frequency, where the first enable signal is sent to the power protection module 11.
In one embodiment, the power protection module 11 further includes a low impedance switch M1, the power protection module 11 is disabled when the low impedance switch M1 is turned on, and the power protection module 11 is maintained when the low impedance switch M1 is turned off.
In one embodiment, the power protection module 11 is further configured to detect the impedance of the input module 10, and further convert the first enable signal into a control signal, where the control signal is used to control the low impedance switch M1 to be turned on or off.
In one embodiment, the power protection module further includes a crosstalk prevention detection circuit 110, a start circuit 111, a reference circuit 112, a control logic circuit 113, and a driving circuit 114.
In an embodiment, the anti-crosstalk detection circuit 110 further includes an enable circuit 1100, an impedance detection circuit 1101, an envelope generation circuit 1102, and a time-masking circuit 1103.
In one embodiment, the anti-crosstalk detection circuit 110 enables the control logic circuit 113 to output a high level after power-up through the enable circuit 1100, and enables the low impedance switch M1 to be turned on. The low impedance switch M1 generates a multi-tap envelope current after being turned on, and the multi-tap envelope current is determined by the impedance detection circuit 1101.
The impedance detection circuit 1101 detects the voltage of the source of the low impedance switch tube M1 in real time through an algorithm, and determines whether to continuously turn on the low impedance switch tube M1 to remove the protection function or maintain the off state of the low impedance switch tube M1 according to the voltage amplitude. If the voltage amplitude of the source of the low impedance switch tube M1 exceeds the set threshold within the trigger time window generated by the time shielding circuit 1103, the low impedance switch tube M1 is kept turned off to maintain the protection function; if the amplitude of the source voltage of the low-impedance switch tube M1 exceeds the set threshold outside the trigger time window generated by the time shielding circuit 1103, the low-impedance switch tube M1 is turned on to release the protection function; if the voltage amplitude of the source of the low impedance switch M1 is lower than the set threshold outside the trigger time window generated by the time masking circuit 1103, the low impedance switch M1 is kept turned off to maintain the protection function.
Then the envelope generating circuit 1102 outputs an envelope signal to control the low impedance switch M1 to turn on and off. When the envelope signal is at a high level, the low impedance switch tube M1 is turned on instantaneously, generating a voltage with impedance detection information. At this time, the impedance detection circuit 1101 still detects the voltage at the source of the low impedance switch tube M1 in real time through an algorithm, and determines whether to continuously turn on the low impedance switch tube M1 to remove the protection function or maintain the off state of the low impedance switch tube M1 according to the magnitude of the voltage at the source of the low impedance switch tube M1. If the amplitude of the source voltage of the low impedance switch M1 exceeds the set threshold within the trigger time window generated by the time shielding circuit 1103, the low impedance switch M1 is kept turned off to maintain the protection function; if the amplitude of the source voltage of the low-impedance switch tube M1 exceeds the threshold value outside the trigger time window generated by the time-masking circuit 1103, the low-impedance switch tube M1 is turned on to release the protection function
Referring to fig. 3, fig. 3 is a schematic diagram illustrating a signal identification module according to a third embodiment of the present invention. In one embodiment, the sampling circuit 140 further includes a signal detecting voltage dividing resistor 1400, and the frequency discriminator circuit 141 further includes a comparator circuit 1410, a counting circuit 1411, and a detecting time window control circuit 1412.
In one embodiment, the output eb.on of the signal identification module 14 is initially low, i.e., the ac signal source 20 is initially set to the commercial power signal rather than the electronic rectifier signal. After the enable circuit 1100 is powered on, the detection time window control circuit 1412, which is composed of the current source Ic, the capacitor C1 and the first comparator CMP1, outputs a high level, providing a time window T0 allowing detection of the input signal of the ac signal source 20. Within the time window of T0, the detected input frequency signal of the second comparator CMP2 and the counter circuit 1141, which allow the detection of the input signal of the ac signal source 20, can be read into the RS latch circuit. If the low-frequency commercial power signal is input, the output frequency of the second comparator CMP2 is only 100Hz, i.e. a 10ms period, and the time window of T0 is much less than 10ms, so the output of the second comparator CMP2 does not flip within the time window of T0, the counting circuit 1141 does not count, and the first enable signal eb.on maintains the output low level, i.e. maintains the state of the input commercial power signal rather than the electronic rectifier. If the input signal of the ac signal source 20 is an electronic rectifier signal, the output frequency of the main current electronic rectifier is usually greater than 20KHz, i.e. 50us cycle, because the output of the electronic rectifier is a high frequency signal. In the time window of T0, the output flip times of the second comparator CMP2 are read into the counter, and when all the 3-stage counters are high, the counting circuit 1141 controls the first enable signal eb.on to output a high level, and finally turns on the low impedance switch M1 to release the protection function, i.e., switch the input to the electronic rectifier state. The T0 time window can satisfy the detection of the input signal with frequency higher than 20KHz, but not limited to this, it can be adjusted according to the frequency of the ac signal source 20.
Referring to fig. 4, fig. 4 is a schematic diagram illustrating a power protection module according to a fourth embodiment of the invention. The power protection module 11 operates as described above. In one embodiment, the third voltage comparator CMP3, the current flowing through the low-impedance switch tube M1 is sampled in real time, and V can be output in real timeCSThe true signal of (2).
The formula for VCS is: vCS＝ICS×RCS
When the signal controls the low impedance switch tube M1 to conduct, a multi-strand head envelope current I is generatedCSEnvelope current I of multi-strand headCSThrough a resistance RCSGenerating a voltage signal VCSWhen the voltage signal VCSGreater than a set reference voltage VREFAnd after CMP _ OUT is turned high, the GATE signal is directly controlled to be kept on after CMP _ OUT is turned high, a real trig.
Meanwhile, the first enable signal eb.on also controls the output of the trig.real signal. The frequency discrimination circuit 141 in the signal identification module 14 determines whether the ac signal is high frequency, and if so, the signal identification module 14 outputs the first enable signal eb.on at high level; if not, the first enable signal eb.on is output as a low level. If the first enable signal eb.on is at a high level, the trig.real signal outputs a low level, the GATE signal is at a low level, and the low impedance switch M1 is turned on to release the protection function. If the first enable signal eb.on is low, the protection state is not released and the CMP _ OUT signal is waited for determination.
In summary, the multi-mode LED driving circuit of the present invention has an input module and a power protection module, and is compatible with the Type B replacement method in the prior art, and can prevent the problem of low leakage of the lamp tube, and further has a signal detection module, which can determine the Type of the ac signal source to switch the compatible mode, and is compatible with the Type a replacement method in the prior art, and does not need to remove the electronic ballast of the T-tube lamp or re-lay the wiring.
The features and spirit of the present invention will become more apparent to those skilled in the art from the description of the preferred embodiments given above, which are given by way of illustration only, and not by way of limitation, of the principles and functions of the present invention. Thus, any modifications and variations may be made to the above-described embodiments without departing from the spirit of the invention, and the scope of the invention is to be determined by the appended claims.
Claims (7)
1. A multi-mode LED driving circuit, comprising:
the input module is connected with an alternating current signal source and used for sending alternating current signals and rectified direct current signals;
the power supply protection module is connected with the input module and used for preventing the alternating current signal source from electric leakage and has a protection function;
the filtering module is connected with the input module and used for receiving and transmitting the direct current signal;
the constant current module is connected with the filtering module and used for receiving the direct current signal and sending a constant current signal according to the direct current signal;
the signal identification module is connected with the input module and used for sending a first enabling signal with high level when the alternating current signal is received to be high frequency and sending a first enabling signal with low level when the alternating current signal is received to be low frequency; and
the output filtering module is connected with the constant current module at one end and connected with an LED load at the other end and used for enabling the LED load to work when the constant current signal is received;
the power protection module is further configured to receive the first enable signal, remove a protection function when the first enable signal is at a high level, and maintain the protection function when the first enable signal is at a low level;
the signal identification module further comprises a sampling circuit and a frequency discrimination circuit, wherein the sampling circuit is used for sampling the alternating current signal and delivering the alternating current signal to the frequency discrimination circuit, and the frequency discrimination circuit is used for judging the frequency of the alternating current signal and sending the corresponding first enabling signal according to the frequency;
the sampling circuit further comprises a signal detection divider resistor, and the frequency discrimination circuit further comprises a comparator circuit, a counting circuit and a detection time window control circuit.
2. The multi-mode LED driver circuit of claim 1, wherein said power protection module further comprises a low impedance switch, said power protection module removing protection when said low impedance switch is on, and said power protection module maintaining protection when said low impedance switch is off.
3. The multi-mode LED driving circuit of claim 2, wherein the power protection module is further configured to detect the input module impedance and further convert the first enable signal into a control signal to control the low impedance switch tube to be turned on or off.
4. A multi-mode LED drive circuit as claimed in claim 2 wherein the power protection module further comprises an anti-crosstalk detection circuit, a start-up circuit, a reference circuit, a control logic circuit, and a drive circuit.
5. A multi-mode LED drive circuit as recited in claim 4, wherein the anti-crosstalk detection circuit further comprises an enable circuit, an envelope generation circuit, an impedance detection circuit, and a time mask circuit.
6. The multi-mode LED driving circuit according to claim 1, wherein the signal recognition module judges that the ac signal source is an electronic ballast and transmits a first enable signal of a high level when the ac signal is a high frequency.
7. The multi-mode LED driving circuit according to claim 1, wherein when the ac signal is a low frequency, the signal recognition module determines that the ac signal source is a commercial power signal and transmits a first enable signal of a low level.
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| CN201811509466.9A CN109618448B (en) | 2018-12-11 | 2018-12-11 | Multi-mode LED drive circuit |
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| CN201811509466.9A CN109618448B (en) | 2018-12-11 | 2018-12-11 | Multi-mode LED drive circuit |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103107776A (en) * | 2011-11-14 | 2013-05-15 | 嘉兴联星微电子有限公司 | Ultralow power consumption band-pass frequency detector and frequency discrimination method of the ultralow power consumption band-pass frequency detector |
| CN106712769A (en) * | 2016-11-24 | 2017-05-24 | 中国电子科技集团公司第四十研究所 | Reference ring circuit with automatic input frequency recognition function and implementation method |
| CN108430133A (en) * | 2018-04-03 | 2018-08-21 | 帝奥微电子有限公司 | LED illumination driving circuit |
| CN209593834U (en) * | 2018-12-11 | 2019-11-05 | 帝奥微电子有限公司 | Multi-mode LED drive circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5564239B2 (en) * | 2009-12-14 | 2014-07-30 | ミネベア株式会社 | LED drive circuit |
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2018
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103107776A (en) * | 2011-11-14 | 2013-05-15 | 嘉兴联星微电子有限公司 | Ultralow power consumption band-pass frequency detector and frequency discrimination method of the ultralow power consumption band-pass frequency detector |
| CN106712769A (en) * | 2016-11-24 | 2017-05-24 | 中国电子科技集团公司第四十研究所 | Reference ring circuit with automatic input frequency recognition function and implementation method |
| CN108430133A (en) * | 2018-04-03 | 2018-08-21 | 帝奥微电子有限公司 | LED illumination driving circuit |
| CN209593834U (en) * | 2018-12-11 | 2019-11-05 | 帝奥微电子有限公司 | Multi-mode LED drive circuit |
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Address after: 6 / F, building 8, Zilang science and Technology City, Nantong innovation District, 60 Chongzhou Avenue, Nantong City, Jiangsu Province, 226017 Patentee after: Jiangsu Dior Microelectronics Co., Ltd Address before: 226017 No. 16 Wei14 Road, Sutong Science and Technology Industrial Park, Nantong City, Jiangsu Province Patentee before: DIAO MICROELECTRONICS Co.,Ltd. |
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