CN108541111B - Constant-current output control circuit and method for LED lamp illumination driving and LED device - Google Patents
Constant-current output control circuit and method for LED lamp illumination driving and LED device Download PDFInfo
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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]
- H05B45/40—Details of LED load 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]
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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
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- 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 invention belongs to the technical field of electronic circuits, and provides a constant-current output control circuit, a constant-current output control method and an LED device for LED lamp illumination driving, wherein an alternating-current signal output by an alternating-current power supply is rectified through a rectification module, and then a direct-current signal is output; and the control module charges the capacitor according to the direct current signal and outputs a control signal to drive the LED lamp string, and detects and controls the current flowing through the LED lamp string. Therefore, the effect of constant current driving of the LED lamp string can be achieved by adopting few devices, the circuit cost is reduced, the driving mode efficiency is high, and the problems that the existing LED lamp lighting driving technology is low in efficiency and the circuit is complex due to the fact that the circuit components are more are solved.
Description
Technical Field
The invention belongs to the technical field of electronic circuits, and particularly relates to a constant current output control circuit and method for LED lamp illumination driving and an LED device.
Background
In recent years, various driving technologies are layered endlessly with the development of LED lamp lighting technologies, but with the continuous expansion of application fields, requirements for driving are also more and more special, for example: size, conversion efficiency, and other requirements, etc., are subject to corresponding constraints. Meanwhile, when factors such as cost sensitivity and reliable circuit appear in certain LED lamp illumination fields, although some existing driving circuits are excellent, the existing driving circuits still cannot avoid the cost problem, the inductive element and the excessive electrolytic capacitive devices; some circuits are relatively simple, and are directly replaced by linear driving, which has the defects of low conversion efficiency and power loss on the current limiting device.
Therefore, the existing LED lamp lighting driving technology has the problems of low efficiency and complicated circuits caused by more circuit components.
Disclosure of Invention
The invention aims to provide a constant current output control circuit, a constant current output control method and an LED device for LED lamp illumination driving, and aims to solve the problems of low efficiency and complicated circuit caused by more circuit components in the existing LED lamp illumination driving technology.
The first aspect of the present invention provides a constant current output control circuit for LED lamp lighting driving, comprising a capacitor and an LED lamp string, the constant current output control circuit further comprising:
the rectification module is connected with the alternating current power supply and used for rectifying an alternating current signal output by the alternating current power supply and outputting a direct current signal;
and the control module is connected with the rectification module and is used for charging the capacitor according to the direct current signal and outputting a control signal to drive the LED lamp string and detecting and controlling the current flowing through the LED lamp string.
The second aspect of the invention provides an LED device comprising a capacitor, an LED string light and an AC power supply, and further comprising a constant current output control circuit as described above
The third aspect of the invention provides a constant current output control method for LED lamp lighting driving, which comprises the following steps:
a capacitor and an LED lamp string are added in a constant current output control circuit, and an alternating current power supply is connected in;
rectifying an alternating current signal output by the alternating current power supply and outputting a direct current signal;
and charging the capacitor and outputting a control signal to drive the LED lamp string according to the direct current signal, and detecting and controlling the current flowing through the LED lamp string.
According to the constant current output control circuit, the constant current output control method and the LED device for LED lamp illumination driving, the alternating current signal output by the alternating current power supply is rectified through the rectification module, and then a direct current signal is output; and the control module charges the capacitor according to the direct current signal and outputs a control signal to drive the LED lamp string, and detects and controls the current flowing through the LED lamp string. Therefore, the effect of constant current driving of the LED lamp string can be achieved by adopting few devices, the circuit cost is reduced, the driving mode efficiency is high, and the problems that the existing LED lamp lighting driving technology is low in efficiency and the circuit is complex due to the fact that the circuit components are more are solved.
Drawings
Fig. 1 is a schematic block diagram of a constant current output control circuit for LED lamp lighting driving according to the present invention.
Fig. 2 is an exemplary circuit diagram of a constant current output control circuit for LED lamp lighting driving provided by the present invention.
Fig. 3 is a schematic waveform diagram of an ac signal output by an ac power supply in the constant current output control circuit for LED lamp lighting driving according to the present invention.
Fig. 4 is a schematic waveform diagram of an ac signal rectified in the constant current output control circuit for LED lamp lighting driving according to the present invention.
Fig. 5 is a schematic diagram of a unit structure of a control module in the constant current output control circuit for LED lamp lighting driving.
Fig. 6 is a circuit example diagram of a control module in a constant current output control circuit for LED lamp lighting driving provided by the present invention.
Fig. 7 is a schematic waveform diagram of important nodes of each part of a control module in the constant current output control circuit for LED lamp lighting driving.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The constant current output control circuit, the method and the LED device for LED lamp illumination driving adopt the characteristic that the capacitor voltage cannot be changed suddenly, form a circuit which utilizes constant current charging, constant current detection and capacitor charging and discharging, and can realize constant current output. Firstly, an alternating current (90-265V AC,50/60 Hz) is input to an alternating current input end, and full-wave rectification is carried out to form a direct current without filtering; then, an external capacitor is charged through an internal high-voltage constant-current circuit, and corresponding power supply is carried out on an external LED lamp string; and detecting the voltage of the sampling resistor to realize the constant output current, thereby realizing the constant current driving of the LED illumination. Therefore, the effect of driving the LED illumination constant current by using few devices is realized.
Fig. 1 shows a block structure of a constant current output control circuit for LED lamp lighting driving provided by the present invention, and for convenience of explanation, only the portions related to this embodiment are shown, and detailed below:
the constant current output control circuit for LED lamp lighting driving comprises a capacitor C1 and an LED lamp string 104, and further comprises a rectifying module 102 and a control module 103.
The rectifying module 102 is connected to the ac power source 101, and is configured to rectify an ac signal output by the ac power source 101 and output a dc signal.
The control module 103 is connected to the rectifying module 102, and is configured to charge the capacitor C1 according to the dc signal and output a control signal to drive the LED string light 104, and detect and control the current flowing through the LED string light 104.
As an embodiment of the present invention, the voltage outputted from the AC power source 101 is in the range of 90-265V, and the frequency is 50/60Hz.
As an embodiment of the invention, the control module 103 charges the capacitor C1 according to the rectified dc signal, and outputs a control signal to drive the LED string; meanwhile, the current flowing through the LED string light 104 is synchronously detected, and the capacitor C1 is fully charged and then discharges, so that the control module 103 adjusts the control signal output by itself according to the detected current flowing through the LED string light 104, so as to further ensure that the current flowing through the LED string light 104 is continuously at a preset threshold value, and thus the LED illumination constant current driving is realized.
Fig. 2 shows an example circuit of the constant current output control circuit for LED lamp lighting driving provided by the present invention, fig. 3 and fig. 4 respectively show an ac signal output by an ac power supply and a waveform schematic diagram after rectification in the constant current output control circuit for LED lamp lighting driving provided by the present invention, and for convenience of explanation, only the portions related to this embodiment are shown, and the details are as follows:
as an embodiment of the invention, the rectifying module 102 includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4;
the cathode of the first diode D1 is connected with the anode of the second diode D2, the anode of the first diode D1 is connected with the anode of the third diode D3, the cathode of the second diode D2 is connected with the cathode of the fourth diode D4, and the cathode of the third diode D3 is connected with the anode of the fourth diode D4.
Specifically, the rectifying module 102 is implemented by a full-bridge rectifying method, and of course, a half-bridge rectifying method may also be implemented.
Fig. 5 shows a unit structure of a control module in the constant current output control circuit for LED lamp lighting driving provided by the present invention, and for convenience of explanation, only a portion related to the present embodiment is shown, and the details are as follows:
as an embodiment of the present invention, the control module 103 includes a pulse generator 1033, a constant current control unit 1031, a sampling shaping unit 1032, and a first switching tube Q1;
the input end of the constant current control unit 1031 is connected with the rectifying module 102, the output end of the constant current control unit 1031 is connected with the input end of the first switching tube Q1, the pulse generator 1033 is connected with the sampling shaping unit 1032, the input end of the sampling shaping unit 1032 is used for detecting current flowing through the LED lamp string 104, the output end of the sampling shaping unit 1032 is connected with the controlled end of the first switching tube Q1, and the output end of the first switching tube Q1 is used for charging the capacitor C1 and outputting a control signal to drive the LED lamp string 104.
Specifically, the first switching transistor Q1 is a field effect transistor or a triode;
the grid electrode, the drain electrode and the source electrode of the field effect transistor are respectively a controlled end, an input end and an output end of the first switch tube Q1;
the base, collector and emitter of the triode are the controlled end, input end and output end of the first switch tube Q1 respectively.
Fig. 6 shows an exemplary circuit of a control module in a constant current output control circuit for LED lamp lighting driving provided by the present invention, and for convenience of explanation, only the portions related to the present embodiment are shown, and the details are as follows:
as an embodiment of the present invention, the constant current control unit 1031 includes a constant current comparator COM2 and a second switching tube Q2;
the non-inverting input end of the constant current comparator COM2 is connected with the reference voltage Vref, the inverting input end of the constant current comparator COM2 is commonly connected with the output end of the second switching tube Q2 and is used as the output end of the constant current control unit 1031, the output end of the constant current comparator COM2 is connected with the controlled end of the second switching tube Q2, and the input end of the second switching tube Q2 is the input end of the constant current control unit 1031.
Specifically, the second switching transistor Q2 is a field effect transistor or a triode;
the grid electrode, the drain electrode and the source electrode of the field effect transistor are respectively a controlled end, an input end and an output end of the second switching tube Q2;
the base, collector and emitter of the triode are the controlled end, input end and output end of the second switch tube Q2 respectively.
As an embodiment of the present invention, the sampling shaping unit 1032 includes an input buffer D1, a threshold comparator COM1, an AND gate AND1, AND a buffer driver T1;
the non-inverting input terminal of the input buffer D1 is used for detecting the current flowing through the LED string 104, the inverting input terminal of the input buffer D1 is commonly connected with the output terminal of the input buffer D1 AND the inverting input terminal of the threshold comparator COM1, the non-inverting input terminal of the threshold comparator COM1 is connected with the reference voltage Vref, the output terminal of the threshold comparator COM1 is connected with the first input terminal of the AND gate AND1, the second input terminal of the AND gate AND1 is connected with the pulse generator 1033, the output terminal of the AND gate AND1 is connected with the input terminal of the buffer driver T1, AND the output terminal of the buffer driver T1 is the output terminal of the sampling shaping unit 1032.
Fig. 7 shows waveforms of important nodes of each part of a control module in the constant current output control circuit for LED lamp lighting driving, and the working principle of the constant current output control circuit for LED lamp lighting driving is described as follows with reference to fig. 1 to 6:
first, after the high-voltage alternating current is subjected to full-bridge rectification, the waveform becomes the waveform illustrated in fig. 4 (or the S201 signal in fig. 7); then, the current is input to the HVIN port of the control module 103, passes through the internal constant current control unit 1031 and the first switching tube Q1, and is controlled by the waveform (S202 in fig. 7) sent out by the sampling shaping unit 1032, and charges the external capacitor C1 through VCC, and the charged current waveform is S203 in fig. 7.
According to the following:
the VCC rise voltage is almost linearly rising, and the waveform is shown in the rising section S205 in fig. 7. Meanwhile, as the voltage increases, the current passing through the LED string 104 increases non-linearly, and the voltage of CS increases in proportion to the same (see S205 in fig. 7).
After increasing to the threshold value inside CS, the waveform (S204 in fig. 7) generated by the pulse generator 1033 is compared with the waveform accordingly, and a control signal for controlling the switching transistor is generated (S202 in fig. 7).
The constant current switch is turned off, and the current of the LED string 104 is completely supplied by the VCC capacitor C1, and the VCC voltage and the current passing through the LED string 104 are nonlinear reduced to wait for the next charging cycle.
The invention also provides an LED device which comprises a capacitor, an LED lamp string and an alternating current power supply, and the LED device also comprises the constant current output control circuit, wherein the constant current output control circuit realizes corresponding constant current output by detecting the voltage on the current detection resistor according to the favorable conditions of constant current charging, controllable capacitor voltage rising and the like according to the capacitor charging and discharging principle.
The constant current output control circuit for the LED lamp illumination drive and the LED device have the advantages that:
1) And the phase sampling circuit of the alternating current input signal of virtual ground. Because the control module (chip) works in a high-voltage state, the chip needs to adopt a high-voltage process, and the chip adopted by the scheme is sampled in a partial virtual mode, the direct adoption of a field mode for sampling the phase of an alternating current input signal is avoided, and the cost is reduced.
2) Constant current output under wide voltage. The current flowing through the LED lamp string is directly sampled, so that constant current output under wide voltage can be realized, compared with other chips with wide voltage constant current output, the peripheral circuit is simple, corresponding functions can be realized only by a plurality of devices, and the BOM cost is low.
The invention also provides a constant current output control method for LED lamp illumination driving, which comprises the following steps:
A. a capacitor and an LED lamp string are added in a constant current output control circuit, and an alternating current power supply is connected in;
B. rectifying an alternating current signal output by an alternating current power supply and outputting a direct current signal;
C. and charging the capacitor according to the direct current signal and outputting a control signal to drive the LED lamp string, and detecting and controlling the current flowing through the LED lamp string.
In an embodiment of the present invention, the rectification of the ac signal output by the ac power supply is specifically performed by a full-bridge rectification method, and of course, a half-bridge rectification method may also be used.
As an embodiment of the present invention, according to the dc signal, charging the capacitor and outputting a control signal to drive the LED string, and detecting and controlling the current flowing through the LED string specifically includes:
after the direct current signal is processed, the output voltage charges the capacitor and outputs a control signal to drive the LED lamp string, and when the electric quantity stored by the capacitor reaches a preset threshold value, the current flowing through the LED lamp string is detected and the control signal is regulated so that the current flowing through the LED lamp string is in the preset threshold value, thus realizing the LED illumination constant current drive.
In summary, the constant current output control circuit, the method and the LED device for LED lamp illumination driving provided by the embodiment of the invention rectify an alternating current signal output by an alternating current power supply through a rectification module and then output a direct current signal; and the control module charges the capacitor according to the direct current signal and outputs a control signal to drive the LED lamp string, and detects and controls the current flowing through the LED lamp string. Therefore, the effect of constant current driving of the LED lamp string can be achieved by adopting few devices, the circuit cost is reduced, the driving mode efficiency is high, and the problems that the existing LED lamp lighting driving technology is low in efficiency and the circuit is complex due to the fact that the circuit components are more are solved.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (9)
1. The utility model provides a constant current output control circuit for LED lamp illumination drive, includes electric capacity and LED lamp cluster, its characterized in that, constant current output control circuit still includes:
the rectification module is connected with the alternating current power supply and used for rectifying an alternating current signal output by the alternating current power supply and outputting a direct current signal;
the control module is connected with the rectification module and is used for charging the capacitor according to the direct current signal and outputting a control signal to drive the LED lamp string and detecting and controlling the current flowing through the LED lamp string;
the control module comprises a pulse generator, a constant current control unit, a sampling shaping unit and a first switching tube;
the input end of the constant current control unit is connected with the rectifying module, the output end of the constant current control unit is connected with the input end of the first switching tube, the pulse generator is connected with the sampling shaping unit, the input end of the sampling shaping unit is used for detecting current flowing through the LED lamp string, the output end of the sampling shaping unit is connected with the controlled end of the first switching tube, and the output end of the first switching tube is used for charging the capacitor and outputting a control signal to drive the LED lamp string;
and the control module adjusts the control signal output by the control module according to the detected current flowing through the LED lamp string.
2. The constant current output control circuit according to claim 1, wherein the first switching transistor is a field effect transistor or a triode;
the grid electrode, the drain electrode and the source electrode of the field effect tube are respectively a controlled end, an input end and an output end of the first switch tube;
the base electrode, the collector electrode and the emitter electrode of the triode are respectively a controlled end, an input end and an output end of the first switching tube.
3. The constant current output control circuit according to claim 1, wherein the constant current control unit includes a constant current comparator and a second switching tube;
the positive-phase input end of the constant-current comparator is connected with a reference voltage, the negative-phase input end of the constant-current comparator is connected with the output end of the second switching tube in a sharing way and is used as the output end of the constant-current control unit, the output end of the constant-current comparator is connected with the controlled end of the second switching tube, and the input end of the second switching tube is the input end of the constant-current control unit.
4. The constant current output control circuit according to claim 3, wherein the second switching transistor is a field effect transistor or a triode;
the grid electrode, the drain electrode and the source electrode of the field effect transistor are respectively a controlled end, an input end and an output end of the second switching tube;
the base electrode, the collector electrode and the emitter electrode of the triode are respectively a controlled end, an input end and an output end of the second switching tube.
5. The constant current output control circuit according to claim 1, wherein the sampling shaping unit includes an input buffer, a threshold comparator, an and gate, and a buffer driver;
the positive phase input end of the input buffer is used for detecting current flowing through the LED lamp string, the negative phase input end of the input buffer is commonly connected with the output end of the input buffer and the negative phase input end of the threshold comparator, the positive phase input end of the threshold comparator is connected with reference voltage, the output end of the threshold comparator is connected with the first input end of the AND gate, the second input end of the AND gate is connected with the pulse generator, the output end of the AND gate is connected with the input end of the buffer driver, and the output end of the buffer driver is the output end of the sampling shaping unit.
6. An LED device comprising a capacitor, an LED string, and an ac power source, wherein the LED device further comprises a constant current output control circuit according to any one of claims 1-5.
7. A constant current output control method for LED lamp lighting driving, characterized by being applied to the constant current output control circuit of any one of claims 1 to 5, comprising:
a capacitor and an LED lamp string are added in a constant current output control circuit, and an alternating current power supply is connected in;
rectifying an alternating current signal output by the alternating current power supply and outputting a direct current signal;
and charging the capacitor and outputting a control signal to drive the LED lamp string according to the direct current signal, and detecting and controlling the current flowing through the LED lamp string.
8. The method of claim 7, wherein rectifying the ac signal output from the ac power source is performed by full-bridge rectification.
9. The method of claim 7, wherein charging the capacitor and outputting a control signal to drive the LED string according to the dc signal, and detecting and controlling a current flowing through the LED string comprises:
after the direct current signal is processed, the capacitor is charged by the output voltage, the control signal is output to drive the LED lamp string, and when the electric quantity stored by the capacitor reaches a preset threshold value, the current flowing through the LED lamp string is detected, and the control signal is regulated to enable the current flowing through the LED lamp string to be in the preset threshold value.
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| TWI783389B (en) * | 2021-02-26 | 2022-11-11 | 矽誠科技股份有限公司 | Light-emitting diode string control system with carrier wave identification function and method of signal identification the same |
| US11578844B2 (en) | 2021-03-31 | 2023-02-14 | Semisilicon Technology Corp. | Light-emitting diode light string control system with carrier identification function and signal identification method thereof |
| CN114205963A (en) * | 2021-12-21 | 2022-03-18 | 欧普照明股份有限公司 | Linear LED driving circuit and driving method |
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| WO2013137678A1 (en) * | 2012-03-15 | 2013-09-19 | 서울반도체 주식회사 | Driving device for light-emitting device |
| CN106163029A (en) * | 2015-03-30 | 2016-11-23 | 常州明石晶电科技有限公司 | A kind of LED lamp tube and constant current driving device thereof |
| CN208434147U (en) * | 2018-05-30 | 2019-01-25 | 深圳市明微电子股份有限公司 | Constant current output control circuit and LED matrix for LED light illumination driving |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013137678A1 (en) * | 2012-03-15 | 2013-09-19 | 서울반도체 주식회사 | Driving device for light-emitting device |
| CN106163029A (en) * | 2015-03-30 | 2016-11-23 | 常州明石晶电科技有限公司 | A kind of LED lamp tube and constant current driving device thereof |
| CN208434147U (en) * | 2018-05-30 | 2019-01-25 | 深圳市明微电子股份有限公司 | Constant current output control circuit and LED matrix for LED light illumination driving |
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