CN111194119A - LED driving circuit and method capable of being controlled by switching and dimming - Google Patents
LED driving circuit and method capable of being controlled by switching and dimming Download PDFInfo
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Abstract
The invention discloses a switchable dimming controlled LED driving circuit and a method, comprising the following steps: the LED dimming control circuit comprises an input module, a filtering module, a constant current module, an output module, an LED load and a switch dimming control circuit; the closing of the control switch S1 collects the AC signal V from the AC signal sourceACSo as to detect whether the alternating current signal source has change, namely whether the dimming command exists. And generating the dimming reference signal according to the detected alternating current signal, and further controlling the driving current output by the constant current module according to the dimming reference signal. The output current can be determined according to the switching time, and the dimming function which is simple and easy to operate is realized; the invention has the advantages of high circuit integration level, simple peripheral components, flexible design and low system application cost.
Description
Technical Field
The present invention relates to the field of power electronics technologies, and in particular, to a switchable dimming controlled LED driving circuit and method.
Background
In the existing lighting market, more and more Light Emitting Diode (LED) tubes are replacing traditional CFL tubes. As the permeability of LED lighting becomes higher, the LED lighting standard becomes higher. In order to meet higher standards, a dimming function needs to be added to the LED lamp tube. The existing LED dimming schemes are not few, such as silicon controlled dimming and PWM dimming. However, when the existing dimming technology is applied to the LED lamp, the circuit structure is complicated, and the cost is significantly increased.
Therefore, how to provide a switchable dimming controlled LED driving circuit and method that can solve the above problems is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides a switchable dimming controlled LED driving circuit and method.
In order to achieve the purpose, the invention adopts the following technical scheme:
a switchable dimming controlled LED drive circuit comprising: the LED dimming control circuit comprises an input module, a filtering module, a constant current module, an output module, an LED load and a switch dimming control circuit;
the input end of the input module and an alternating current signal source VACThe output end of the input module is connected with the input end of the filtering module, and the input module is used for inputting an alternating current signal source VACThe direct current signal is rectified into a direct current signal, and the rectified direct current signal is sent to the input end of the filtering module through the output end of the input module;
the input end of the filtering module is connected with the output end of the input module, the output end of the filtering module is connected with the input end of the constant current module, and the filtering module is used for filtering the direct current signal sent by the input module and outputting the filtered direct current signal to the constant current module;
the input end of the constant current module is connected with the output end of the filtering module, the output end of the constant current module is connected with the input end of the output filtering module, and the constant current module is used for controlling the stability of an output direct current signal and sending the constant current signal to the output filtering module;
the input end of the output filtering module is connected with the output end of the constant current module, the output end of the output filtering module is connected with the LED load, and the output filtering module is used for sending a working signal instruction to control the LED load to work when receiving a constant current signal;
the input end of the switch dimming control circuit and the alternating current signal source VACAnd the output end of the switch dimming control circuit is connected with the control end of the constant current module, and the switch dimming control circuit is used for controlling the driving current output by the constant current module.
Preferably, the switching dimming control circuit includes: the dimming control module comprises a switch S1, a dimming signal detection module, a dimming signal conversion module and a dimming control module;
one end of the switch S1 and an alternating current signal source VACThe other end of the switch is connected with the input end of the dimming signal detection module, and the switch S1 is used for controlling an alternating current signal source VACThe dimming signal detection module is communicated with the dimming signal detection module;
the input end of the dimming signal detection module is connected with the switch S1, the output end of the dimming signal detection module is connected with the input end of the dimming signal conversion module, and the dimming signal detection module is used for detecting an alternating current signal source VACIf the bus sampling signal is changed, namely, if the dimming instruction exists, outputting the bus sampling signal to the dimming signal conversion module by detecting a mains supply signal on a channel;
the input end of the dimming signal conversion module is connected with the output end of the dimming signal detection module, the output end of the dimming signal conversion module is connected with the input end of the dimming control module, and the dimming signal conversion module is used for generating a dimming reference signal according to a received bus sampling signal and sending the dimming reference signal to the dimming control module;
the input end of the dimming control module is connected with the output end of the dimming signal conversion module, the output end of the dimming control module is connected with the control end of the constant current module, and the dimming control module is used for controlling the driving current output by the constant current module according to the dimming reference signal.
Preferably, the dimming signal conversion module includes: the device comprises a signal conversion circuit, an oscillator, a logic control circuit and a potential selection module; the output ends of the signal conversion circuit and the oscillator are connected with the logic control circuit, and the output end of the logic control circuit is connected with the input end of the potential selection module.
Preferably, the logic control circuit includes: a switch S2, a frequency divider, and a logic circuit; the input end of the frequency divider is connected with the switch S2, and the output end of the frequency divider is connected with the input end of the logic circuit.
A switchable dimming controlled LED driving method adopts the switchable dimming controlled LED driving circuit, and specifically comprises the following steps:
s1: the input module is used for alternating current signal source VACRectifying to generate a direct current signal, and sending the generated direct current signal to the filtering module;
s2: the filtering module carries out direct current filtering on the direct current signal rectified by the input module, and then sends the filtered direct current signal to the constant current module;
s3: the constant current module receives a signal of the switch dimming control circuit and controls a driving current output by the constant current module to the output filtering module;
s4: and when the output filtering module receives the constant current signal, the output filtering module sends a working signal to the LED load to drive the LED load to work.
Preferably, the step S3 further includes the steps of:
s31: the switch S1 is closed, and the dimming signal detection module collects an alternating current signal VACDetecting AC signal source VACIf the bus sampling signal is changed, namely, if the dimming instruction exists, outputting the bus sampling signal to the dimming signal conversion module by detecting a mains supply signal on a channel;
s32: the dimming signal conversion module generates a dimming reference signal according to the received bus sampling signal and sends the dimming reference signal to the dimming control module;
s33: the dimming control module controls the driving current output by the constant current module according to the dimming reference signal.
Preferably, the step S32 further includes: the dimming reference signal may be changed according to the voltage amplitude of the detected bus sampling signal, or may be changed according to the time length of the detected bus sampling signal. When the dimming reference signal changes according to the time length of the detected bus sampling signal, namely, along with the change of the time length of the bus sampling signal, the dimming reference signal continuously changes. Alternatively, the dimming reference signal may be switched from the first setting value to N-th setting value continuously during a time period of the detected bus sampling signal, and when the time period is over, the dimming reference signal is switched to the N-th setting value. Then, at the beginning of the second time period, the dimming reference signal will be switched from the Nth set value to the N-th gear continuously, and when the second time period is over, the dimming reference signal is switched to the first set value. Wherein, the first set value is larger than the Nth set value. There may be N steps between the first set point and the nth set point. When the switch S1 is turned off, the bus sampling signal is set to zero level because the commercial power signal VAC of the ac signal source is not sampled. Then, the bus sampling signal does not output a switching signal, and the dimming reference signal is latched to the current state, i.e., the dimming reference signal is latched to the xth setting value and does not change any more. The X-th set value is smaller than or equal to the first set value, and the X-th set value is larger than or equal to the N-th set value.
According to the technical scheme, compared with the prior art, the LED driving circuit and the method capable of being controlled by switching and dimming are provided, the output current can be determined according to the switching time, and the dimming function which is simple and easy to operate is realized; the invention has the advantages of high circuit integration level, simple peripheral components, flexible design and low system application cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a block diagram of the general principles of the switchable dimming controlled LED driver circuit of the present invention;
FIG. 2 is a schematic block diagram of the switching dimmer control circuit of the present invention;
FIG. 3 is a schematic diagram of the dimming signal conversion module according to the present invention;
FIG. 4 is a circuit diagram of the dimming signal conversion module according to the present invention;
fig. 5 is an overall schematic diagram of another dimming signal conversion module according to the present invention;
FIG. 6 is a schematic diagram of a logic control circuit according to the present invention;
FIG. 7 is a timing waveform diagram of the logic control circuit of the present invention;
in fig. 1-7:
the dimming circuit comprises an input module, a 2-filtering module, a 3-constant current module, a 4-output filtering module, a 5-LED load, a 6-switch dimming control circuit, a 61-switch S1, a 62-dimming signal detection module, a 63-dimming signal conversion module, a 631-signal conversion circuit, a 632-pulse generation circuit, a 633-charging and discharging control module, a 634-reference voltage regulation circuit, a 635-oscillator, a 636-logic control circuit, a 6361-switch S2, a 6362-frequency divider, a 6363-logic circuit, a 637-potential selection module and a 64-dimming control module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1 to 6, an embodiment of the present invention discloses a switchable dimming controlled LED driving circuit, including: the method comprises the following steps: the LED dimming circuit comprises an input module 1, a filtering module 2, a constant current module 3, an output module 4, an LED load 5 and a switch dimming control circuit 6;
input module 1, input end of input module 1 and alternating current signal source VACThe output end of the input module 1 is connected with the input end of the filter module 2, and the input module 1 is used for inputting an alternating current signal source VACThe direct current signal is rectified into a direct current signal, and the rectified direct current signal is sent to the input end of the filtering module 2 through the output end of the input module 1;
the input end of the filtering module 2 is connected with the output end of the input module 1, the output end of the filtering module 2 is connected with the input end of the constant current module 3, and the filtering module 2 is used for filtering the direct current signal sent by the input module 1 and outputting the filtered direct current signal to the constant current module 3;
the input end of the constant current module 3 is connected with the output end of the filter module 2, the output end of the constant current module 3 is connected with the input end of the output filter module 4, and the constant current module 3 is used for controlling the stability of an output direct current signal and sending the constant current signal to the output filter module 4;
the input end of the output filtering module 4 is connected with the output end of the constant current module 3, the output end of the output filtering module 4 is connected with the LED load 5, and the output filtering module 4 is used for sending a working signal instruction to control the LED load 5 to work when receiving a constant current signal;
switch dimming control circuit 6, input end of switch dimming control circuit 6 and alternating current signal source VACAnd the output end of the switch dimming control circuit 6 is connected with the control end of the constant current module 3, and the switch dimming control circuit 6 is used for controlling the driving current output by the constant current module 3.
In one embodiment, referring to fig. 2, the switching dimming control circuit 6 includes: a switch S161, a dimming signal detection module 62, a dimming signal conversion module 63, and a dimming control module 64;
one end of the switch S161 and the AC signal source VACConnected to the other end of the switch S161, and connected to the input end of the dimming signal detection module 62, the switch S161 is used for controlling the AC signal source VACCommunication with the dimming signal detection module 62;
the input end of the dimming signal detection module 62 is connected to the switch S161, the output end of the dimming signal detection module 62 is connected to the input end of the dimming signal conversion module 63, and the dimming signal detection module 62 is used for detecting the ac signal source VACIf there is a change, that is, if there is a dimming command, the bus sampling signal is output to the dimming signal conversion module 63 by detecting the mains supply signal on the path;
the input end of the dimming signal conversion module 63 is connected with the output end of the dimming signal detection module 62, the output end of the dimming signal conversion module 63 is connected with the input end of the dimming control module 64, and the dimming signal conversion module 63 is used for generating a dimming reference signal according to the received bus sampling signal and sending the dimming reference signal to the dimming control module 64;
and an input end of the dimming control module 64 is connected with an output end of the dimming signal conversion module 63, an output end of the dimming control module 64 is connected with a control end of the constant current module 3, and the dimming control module 64 is used for controlling the driving current output by the constant current module 3 according to the dimming reference signal.
In one embodiment, referring to fig. 3, the dimming signal conversion module 63 includes: a signal conversion circuit 631, a pulse generation circuit 632, a charge-discharge control module 633 and a reference voltage adjustment circuit 634; the output ends of the signal conversion circuit 631 and the pulse generation circuit 632 are connected with the input end of the charge-discharge control module 633; the output end of the charge and discharge control module 633 is connected with the input end of the reference voltage regulating circuit 634; referring to fig. 4, a circuit diagram of the dimming signal conversion module 63 is shown.
In one embodiment, referring to fig. 5, the dimming signal conversion module 63 includes: the signal conversion circuit 631, the oscillator 635, the logic control circuit 636 and the potential selection module 637; the output terminals of the signal conversion circuit 631 and the oscillator 635 are connected to the logic control circuit 636, and the output terminal of the logic control circuit 636 is connected to the input terminal of the potential selection module 637.
In one embodiment, referring to fig. 6, the logic control circuit 636 comprises: a switch S26361, a frequency divider 6362, and a logic circuit 6363; an input of the frequency divider 6362 is connected to the switch S26361, and an output of the frequency divider 6362 is connected to an input of the logic circuit 6363.
Example 2
A switchable dimming controlled LED driving method adopts a switchable dimming controlled LED driving circuit, and specifically comprises the following steps:
s1: input mouldBlock 1 pair of ac signal source VACRectifying to generate a direct current signal, and sending the generated direct current signal to the filtering module 2;
s2: the filtering module 2 performs direct current filtering on the direct current signal rectified by the input module 1, and then sends the filtered direct current signal to the constant current module 3;
s3: the constant current module (3) receives a signal of the switch dimming control circuit 6 and controls a driving current output by the constant current module 3 to the output filtering module 4;
s4: and when the output filtering module 4 receives the constant current signal, a working signal is sent to the LED load to drive the LED load to work.
In a specific embodiment, step S3 further includes the following steps:
s31: the switch S161 is closed, and the dimming signal detection module 62 collects the AC signal VACDetecting AC signal source VACIf there is a change, that is, if there is a dimming command, the bus sampling signal is output to the dimming signal conversion module 63 by detecting the mains supply signal on the path;
s32: the dimming signal conversion module 63 generates a dimming reference signal according to the received bus sampling signal, and sends the dimming reference signal to the dimming control module 64;
s33: the dimming control module 64 controls the driving current output from the constant current module 3 according to the dimming reference signal.
In a specific embodiment, step S32 further includes: the dimming reference signal may be changed according to the voltage amplitude of the detected bus sampling signal, or may be changed according to the time length of the detected bus sampling signal. When the dimming reference signal changes according to the time length of the detected bus sampling signal, namely, along with the change of the time length of the bus sampling signal, the dimming reference signal continuously changes. Alternatively, the dimming reference signal may be switched from the first setting value to the nth setting value continuously during a time period of the detected bus sampling signal, and when the time period is over, the dimming reference signal is switched to the nth setting value. Then, at the beginning of the second time period, the dimming reference signal will be switched from the nth setting value to the nth setting value continuously, and when the second time period is over, the dimming reference signal is switched to the first setting value. Wherein, the first set value is larger than the Nth set value. There may be N steps between the first set point and the nth set point. When the switch S1 is turned off, the bus sampling signal is set to zero level because the commercial power signal VAC of the ac signal source is not sampled. Then, the bus sampling signal does not output a switching signal, and the dimming reference signal is latched to the current state, i.e., the dimming reference signal is latched to the xth setting value and does not change any more. The X-th set value is smaller than or equal to the first set value, and the X-th set value is larger than or equal to the N-th set value.
In a specific embodiment, referring to fig. 6, for the gear setting of the potential selection module, it is not limited to the form with eight gears, the number of the selection switches and the bus square wave signal V output by the signal conversion circuit can be selected according to the requirement of the gear of dimming brightness to be achievedBUS_PWM2The switch S26361 is controlled to be turned on and off, so as to control the output of the clock signal CLK to the channel of the frequency divider 6362. The frequency divider 6362 outputs square wave signals with different multiple periods, such as J1 to J4, and outputs eight state selection control signals, such as N1 to N8, after being processed by the logic circuit 6363. The timing waveforms are shown in fig. 7.
The logic control circuit 636 has a latch function. When the switch S161 is turned off suddenly after being turned on for a period of time, which is just in a period when the logic control circuit 636 outputs the N3 signal to be valid, the dimming reference signal V output by the level selection module 637OUT_CCWill latch at the third set value V3 potential. That is, the driving current output by the constant current module 3 is maintained as the third driving current ILED3At this time, the LED lamp is operated with 62.5% brightness.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A switchable dimming controlled LED driver circuit, comprising: the LED dimming circuit comprises an input module (1), a filtering module (2), a constant current module (3), an output module (4), an LED load (5) and a switch dimming control circuit (6);
the input end of the input module (1) and an alternating current signal source VACThe output end of the input module (1) is connected with the input end of the filter module (2), and the input module (1) is used for inputting an alternating current signal source VACThe direct current signal is rectified into a direct current signal, and the rectified direct current signal is sent to the input end of the filtering module (2) through the output end of the input module (1);
the input end of the filtering module (2) is connected with the output end of the input module (1), the output end of the filtering module (2) is connected with the input end of the constant current module (3), and the filtering module (2) is used for filtering the direct current signal sent by the input module (1) and outputting the filtered direct current signal to the constant current module (3);
the input end of the constant current module (3) is connected with the output end of the filtering module (2), the output end of the constant current module (3) is connected with the input end of the output filtering module (4), and the constant current module (3) is used for controlling the stability of an output direct current signal and sending the constant current signal to the output filtering module (4);
the input end of the output filtering module (4) is connected with the output end of the constant current module (3), the output end of the output filtering module (4) is connected with the LED load (5), and the output filtering module (4) is used for sending a working signal instruction to control the LED load (5) to work when receiving a constant current signal;
the input end of the switch dimming control circuit (6) and an alternating current signal source VACAnd the output end of the switch dimming control circuit (6) is connected with the control end of the constant current module (3), and the switch dimming control circuit (6) is used for controlling the driving current output by the constant current module (3).
2. A switchable dimming controlled LED driving circuit according to claim 1, wherein the switching dimming control circuit (6) comprises: the dimming control circuit comprises a switch S1(61), a dimming signal detection module (62), a dimming signal conversion module (63) and a dimming control module (64);
one end of the switch S1(61) is connected with an alternating current signal source VACThe other end of the switch is connected with the input end of the dimming signal detection module (62), and the switch S1(61) is used for controlling an alternating current signal source VACA communication with the dimming signal detection module (62);
the input end of the dimming signal detection module (62) is connected with the switch S1(61), the output end of the dimming signal detection module (62) is connected with the input end of the dimming signal conversion module (63), and the dimming signal detection module (62) is used for detecting an alternating current signal source VACWhether the change exists or not, namely whether a dimming instruction exists or not, and outputting a bus sampling signal to the dimming signal conversion module (63) by detecting a mains supply signal on a channel;
the input end of the dimming signal conversion module (63) is connected with the output end of the dimming signal detection module (62), the output end of the dimming signal conversion module (63) is connected with the input end of the dimming control module (64), and the dimming signal conversion module (63) is used for generating a dimming reference signal according to a received bus sampling signal and sending the dimming reference signal to the dimming control module (64);
the input end of the dimming control module (64) is connected with the output end of the dimming signal conversion module (63), the output end of the dimming control module (64) is connected with the control end of the constant current module (3), and the dimming control module (64) is used for controlling the driving current output by the constant current module (3) according to the dimming reference signal.
3. A switchable dimming controlled LED driving circuit according to claim 2, wherein the dimming signal conversion module (63) comprises: a signal conversion circuit (631), a pulse generation circuit (632), a charge-discharge control module (633) and a reference voltage regulation circuit (634); the output ends of the signal conversion circuit (631) and the pulse generation circuit (632) are connected with the input end of the charge and discharge control module (633); the output end of the charge and discharge control module (633) is connected with the input end of the reference voltage regulating circuit (634).
4. A switchable dimming controlled LED driving circuit according to claim 2, wherein the dimming signal conversion module (63) comprises: the device comprises a signal conversion circuit (631), an oscillator (635), a logic control circuit (636) and a potential selection module (637); the output ends of the signal conversion circuit (631) and the oscillator (635) are connected with the logic control circuit (636), and the output end of the logic control circuit (636) is connected with the input end of the potential selection module (637).
5. A switchable dimming controlled LED driver circuit according to claim 4, wherein the logic control circuit (636) comprises: a switch S2(6361), a frequency divider (6362), and a logic circuit (6363); an input terminal of the frequency divider (6362) is connected to the switch S2(6361), and an output terminal of the frequency divider (6362) is connected to an input terminal of the logic circuit (6363).
6. A switchable dimming controlled LED driving method is characterized in that a switchable dimming controlled LED driving circuit is adopted, and the method specifically comprises the following steps:
s1: the input module (1) is used for alternating current signal source VACRectifying to generate a direct current signal, and sending the generated direct current signal to the filtering module (2);
s2: the filtering module (2) performs direct-current filtering on the direct-current signal rectified by the input module (1), and then sends the filtered direct-current signal to the constant-current module (3);
s3: the constant current module (3) receives a signal of the switch dimming control circuit (6) and controls a driving current output by the constant current module (3) to the output filtering module (4);
s4: and when the output filtering module (4) receives the constant current signal, a working signal is sent to the LED load to drive the LED load to work.
7. The method of claim 6, wherein the step S3 further comprises the steps of:
s31: the switch S1(61) is closed, and the dimming signal detection module (62) collects an alternating current signal VACDetecting AC signal source VACWhether the change exists or not, namely whether a dimming instruction exists or not, and outputting a bus sampling signal to the dimming signal conversion module (63) by detecting a mains supply signal on a channel;
s32: the dimming signal conversion module (63) generates a dimming reference signal according to the received bus sampling signal, and sends the dimming reference signal to the dimming control module (64);
s33: the dimming control module (64) controls the driving current output by the constant current module (3) according to the dimming reference signal.
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| CN118275744A (en) * | 2024-06-03 | 2024-07-02 | 成都光创联科技有限公司 | Optical device test protection circuit and optical device test system |
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| CN211378326U (en) * | 2020-03-10 | 2020-08-28 | 帝奥微电子有限公司 | But LED drive circuit of switch control of adjusting luminance |
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| CN118275744A (en) * | 2024-06-03 | 2024-07-02 | 成都光创联科技有限公司 | Optical device test protection circuit and optical device test system |
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Application publication date: 20200522 |