CN113365391A - Intelligent dimming turn-off control circuit and driving power supply - Google Patents
Intelligent dimming turn-off control circuit and driving power supply Download PDFInfo
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- CN113365391A CN113365391A CN202110469971.0A CN202110469971A CN113365391A CN 113365391 A CN113365391 A CN 113365391A CN 202110469971 A CN202110469971 A CN 202110469971A CN 113365391 A CN113365391 A CN 113365391A
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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
- H05B45/32—Pulse-control circuits
- H05B45/325—Pulse-width modulation [PWM]
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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]
- H05B45/10—Controlling the intensity of the light
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Abstract
The invention relates to an intelligent dimming turn-off control circuit and a driving power supply, comprising: the dimming circuit comprises a dimming input circuit, a signal processing circuit, an isolation transmission circuit and a dimming turn-off circuit; the dimming input circuit is used for receiving the dimming signal and processing the dimming signal so as to output a PWM control signal; the signal processing circuit is connected with the dimming input circuit and is used for processing the PWM control signal; the dimming turn-off circuit is connected with the signal processing circuit and the isolation transmission circuit, is switched on or switched off according to the signal output by the signal processing circuit and the control of the isolation transmission circuit, and is used for turning off the electric energy of the main control IC when the signal is switched off. The invention can cut off the electric energy from the primary side by cutting off the electric energy of the main control IC when the dimming is turned off, thereby achieving the purpose of really turning off the dimming and solving the problem of flickering of the LED lamp.
Description
Technical Field
The invention relates to the technical field of driving power supplies, in particular to an intelligent dimming turn-off control circuit and a driving power supply.
Background
LEDs are gradually replacing traditional lighting and are widely used in various lighting applications. Along with the increasing development of social and economic construction, the level of urban road infrastructure illumination construction becomes an important sign of the speed and the level of urban development, and the quality of illumination engineering not only influences the safety of vehicles and pedestrians, but also relates to whether the energy-saving and environment-friendly goal can be realized.
The existing LED driving power supply still has some problems, so that the user experience is poor. For example, in a conventional dimming circuit of an LED driving power supply, there is still a problem of flickering of an LED lamp after dimming is turned off, and in order to solve the problem, a common way is to provide a corresponding turn-off or control circuit on a secondary side of the LED driving power supply to solve the problem of flickering of the LED lamp after dimming is turned off. However, in these methods, only the secondary side of the LED driving power supply is turned off, and the primary side of the LED driving power supply may still have electric energy, so that the current loop cannot be cut off really, and a weak current still exists, which may cause the problem of flickering of the LED lamp to be solved incompletely, and the dimming and turning off cannot be really achieved.
Disclosure of Invention
The present invention provides an intelligent dimming turn-off control circuit and a driving power supply, aiming at the above-mentioned defects in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a smart dimming turn-off control circuit is constructed comprising: the dimming circuit comprises a dimming input circuit, a signal processing circuit, an isolation transmission circuit and a dimming turn-off circuit;
the dimming input circuit is used for receiving a dimming signal and processing the dimming signal so as to output a PWM control signal;
the signal processing circuit is connected with the dimming input circuit and is used for processing the PWM control signal;
the dimming turn-off circuit is connected with the signal processing circuit and the isolation transmission circuit, is switched on or switched off according to the signal output by the signal processing circuit and the control of the isolation transmission circuit, and is used for turning off the electric energy of the main control IC when the signal is switched off.
In the smart dimming turn-off control circuit of the present invention, the dimming input circuit includes: a dimming signal receiving circuit and a PWM signal generating circuit;
the dimming signal receiving circuit is used for receiving a dimming signal and processing the dimming signal;
the PWM signal generating circuit is connected with the dimming signal receiving circuit, processes the signal output by the dimming signal receiving circuit and outputs the PWM control signal.
In the intelligent dimming turn-off control circuit of the present invention, the signal processing circuit is a voltage comparison circuit.
In the intelligent dimming turn-off control circuit of the present invention, the isolation transmission circuit includes a photocoupler.
In the smart dimming turn-off control circuit of the present invention, the dimming signal receiving circuit includes: the circuit comprises a first capacitor, a common-mode inductor, an input resistor, a first voltage-regulator tube and a second capacitor;
the first end of the first capacitor is connected with the positive output end of the dimming circuit, the second end of the first capacitor is connected with the negative output end of the dimming circuit, the first end of the common-mode inductor is connected with the first end of the first capacitor, the second end of the common-mode inductor is connected with the second end of the first capacitor, the third end of the common-mode inductor is connected with the first end of the input resistor, and the fourth end of the common-mode inductor is grounded;
the second end of the input resistor is connected with the PWM signal generating circuit, the negative electrode of the first voltage-regulator tube is connected with the second end of the input resistor, the positive electrode of the first voltage-regulator tube is grounded, and the second capacitor is connected with the first voltage-regulator tube in parallel.
In the smart dimming turn-off control circuit of the present invention, the PWM signal generation circuit includes: the third capacitor, the fourth capacitor, the sixth resistor and the dimming chip;
the fifth pin of the dimming chip is connected with the second end of the input resistor, the sixth pin of the dimming chip is grounded through the third capacitor, the seventh pin of the dimming chip is grounded through the fourth capacitor, the eighth pin of the dimming chip is grounded through the sixth resistor, and the fourth pin of the dimming chip outputs the PWM control signal.
In the smart dimming turn-off control circuit of the present invention, the voltage comparison circuit includes: a tenth resistor, a seventh capacitor, a ninth resistor, an eighth capacitor, an eleventh resistor and an operational amplifier;
the first end of the tenth resistor is connected with the fourth pin of the dimming chip, the second end of the tenth resistor is connected with the negative input end of the operational amplifier, the negative input end of the operational amplifier is grounded through the seventh capacitor, the positive input end of the operational amplifier is grounded through the ninth resistor, the output end of the operational amplifier is connected with the dimming turn-off circuit, the eighth capacitor is connected with the ninth resistor in parallel, the first end of the eleventh resistor is connected with the positive input end of the operational amplifier, and the second end of the eleventh resistor is connected with the output end of the operational amplifier.
In the smart dimming turn-off control circuit of the present invention, the dimming turn-off circuit includes: the first resistor, the second resistor, the third switch tube, the fourth switch tube and the fourth switch tube are connected in series;
a first end of the twelfth resistor is connected with an output end of the operational amplifier, a second end of the twelfth resistor is connected with a first end of the first resistor and a first end of the first switch tube, a second end of the first resistor is grounded, a third end of the first switch tube is grounded, a second end of the first switch tube is connected with a high level through the third resistor, a second end of the first switch tube is also connected with a first end of the second switch tube, a third end of the second switch tube is grounded, a second end of the second switch tube is connected with a second end of the photoelectric coupler, and a first end of the photoelectric coupler is connected with the high level through the second resistor;
the third end of the photoelectric coupler is connected with the first end of the third switching tube and the negative electrode of the second voltage-stabilizing tube, the positive electrode of the second voltage-stabilizing tube is grounded, the fourth end of the photoelectric coupler is connected with the third end of the third switching tube through a fifth resistor, and the second end of the third switching tube is connected with the power supply end of the master control IC.
In the intelligent dimming turn-off control circuit of the present invention, the first switching tube and the second switching tube are MOS tubes, and the third switching tube is a triode.
The invention also provides a driving power supply which comprises the intelligent dimming turn-off control circuit.
The intelligent dimming turn-off control circuit has the following beneficial effects: the method comprises the following steps: the dimming circuit comprises a dimming input circuit, a signal processing circuit, an isolation transmission circuit and a dimming turn-off circuit; the dimming input circuit is used for receiving the dimming signal and processing the dimming signal so as to output a PWM control signal; the signal processing circuit is connected with the dimming input circuit and is used for processing the PWM control signal; the dimming turn-off circuit is connected with the signal processing circuit and the isolation transmission circuit, is switched on or switched off according to the signal output by the signal processing circuit and the control of the isolation transmission circuit, and is used for turning off the electric energy of the main control IC when the signal is switched off. The invention can cut off the electric energy from the primary side by cutting off the electric energy of the main control IC when the dimming is turned off, thereby achieving the purpose of really turning off the dimming and solving the problem of flickering of the LED lamp.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic block diagram of an intelligent dimming shutdown control circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a smart dimming shutdown control circuit according to an embodiment of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic block diagram of an alternative embodiment of an intelligent dimming shutdown control circuit provided in the present invention.
Specifically, as shown in fig. 1, the smart dimming turn-off control circuit includes: a dimming input circuit 11, a signal processing circuit 12, an isolation transmission circuit 14, and a dimming shutdown circuit 13.
The dimming input circuit 11 is configured to receive a dimming signal and process the dimming signal to output a PWM control signal; the signal processing circuit 12 is connected to the dimming input circuit 11 and processes the PWM control signal; the dimming shutdown circuit 13 is connected to the signal processing circuit 12 and the isolation transmission circuit 14, is turned on or off according to the signal output by the signal processing circuit 12 and the control of the isolation transmission circuit 14, and shuts off the power of the main control IC when turned off.
When the light-dimming is turned off, the electric energy of the main control IC is directly turned off, so that the electric energy is turned off on the primary side, the effect of complete light-dimming turning off is achieved, and the phenomenon of incomplete turning off is avoided.
Further, as shown in fig. 1, in some embodiments, the dimming input circuit 11 includes: a dimming signal receiving circuit 101 and a PWM signal generating circuit 102.
The dimming signal receiving circuit 101 is configured to receive a dimming signal and process the dimming signal. The PWM signal generation circuit 102 is connected to the dimming signal reception circuit 101, and processes a signal output from the dimming signal reception circuit 101 to output a PWM control signal.
In some embodiments, the signal processing circuit 12 is a voltage comparison circuit.
In the embodiment of the present invention, the isolation transmission circuit 14 includes a photo coupler OP 2. By adopting the photoelectric coupler OP2 to carry out isolated transmission, the isolated dimming cut-off transmission function can be achieved, and the good isolation and transmission of the dimming part and the primary main control part are realized.
Optionally, the intelligent dimming turn-off control circuit of the embodiment of the invention can be applied to different fields such as large-scale court lighting, high-power LED display screen driving power supplies, industrial and mining lamps, street lamps, tunnel lamps, plant lighting lamps, commercial lighting lamps and the like. Moreover, the intelligent dimming turn-off control circuit can solve the problem of dimming turn-off from the primary side, improve the reliability of products and prolong the service life of a power supply.
Referring to fig. 2, fig. 2 is a circuit diagram of an alternative embodiment of the smart dimming shutdown control circuit according to an embodiment of the present invention.
As shown in fig. 2, in this embodiment, the dimming signal receiving circuit 101 includes: the circuit comprises a first capacitor C1, a common mode inductor LF4, an input resistor R37, a first voltage regulator tube ZD1 and a second capacitor C2.
A first end of the first capacitor C1 is connected with a positive output end of the dimming circuit, a second end of the first capacitor C1 is connected with a negative output end of the dimming circuit, a first end of the common-mode inductor LF4 is connected with a first end of the first capacitor C1, a second end of the common-mode inductor LF4 is connected with a second end of the first capacitor C1, a third end of the common-mode inductor LF4 is connected with a first end of the input resistor R37, and a fourth end of the common-mode inductor LF4 is grounded; the second end of the input resistor R37 is connected with the PWM signal generating circuit 102, the negative electrode of the first voltage-regulator tube ZD1 is connected with the second end of the input resistor R37, the positive electrode of the first voltage-regulator tube ZD1 is grounded, and the second capacitor C2 is connected with the first voltage-regulator tube ZD1 in parallel.
In this embodiment, the PWM signal generation circuit 102 includes: a third capacitor C3, a fourth capacitor C4, a sixth resistor 6 and a dimming chip U1.
The fifth pin of the dimming chip U1 is connected to the second end of the input resistor R37, the sixth pin of the dimming chip U1 is grounded through a third capacitor C3, the seventh pin of the dimming chip U1 is grounded through a fourth capacitor C4, the eighth pin of the dimming chip U1 is grounded through a sixth resistor 6, and the fourth pin of the dimming chip U1 outputs a PWM control signal.
The voltage comparison circuit includes: a tenth resistor R10, a seventh capacitor C7, a ninth resistor R9, an eighth capacitor C8, an eleventh resistor R11 and an operational amplifier U2.
A first end of the tenth resistor R10 is connected to the fourth pin of the dimming chip U1, a second end of the tenth resistor R10 is connected to the negative input terminal of the operational amplifier U2, the negative input terminal of the operational amplifier U2 is further grounded via the seventh capacitor C7, the positive input terminal of the operational amplifier U2 is grounded via the ninth resistor R9, the output terminal of the operational amplifier U2 is connected to the dimming shutdown circuit 13, the eighth capacitor C8 is connected in parallel to the ninth resistor R9, a first end of the eleventh resistor R11 is connected to the positive input terminal of the operational amplifier U2, and a second end of the eleventh resistor R11 is connected to the output terminal of the operational amplifier U2.
The dimming shutdown circuit 13 includes: a twelfth resistor R12, a first resistor R1, a third resistor R3, a first switch tube Q1, a second switch tube Q2, a third switch tube Q3 and a second voltage regulator tube ZD 2.
A first end of the twelfth resistor R12 is connected to the output end of the operational amplifier U2, a second end of the twelfth resistor R12 is connected to the first end of the first resistor R1 and to the first end of the first switch tube Q1, a second end of the first resistor R1 is grounded, a third end of the first switch tube Q1 is grounded, a second end of the first switch tube Q1 is connected to a high level through the third resistor R3, a second end of the first switch tube Q1 is also connected to the first end of the second switch tube Q2, a third end of the second switch tube Q2 is grounded, a second end of the second switch tube Q2 is connected to a second end of the photocoupler OP2, and a first end of the photocoupler OP2 is connected to a high level (DIM-VCC) through the second resistor R2.
The third end of the photoelectric coupler OP2 is connected with the first end of the third switching tube Q3 and the negative electrode of the second voltage-regulator tube ZD2, the positive electrode of the second voltage-regulator tube ZD2 is grounded, the fourth end of the photoelectric coupler OP2 is connected with the third end of the third switching tube Q3 through a fifth resistor R5, and the second end of the third switching tube Q3 is connected with the power supply end of the main control IC (for example, the eighth pin of U3 shown in fig. 2).
Optionally, the first switching tube Q1 and the second switching tube Q2 are MOS tubes, and the third switching tube Q3 is a triode.
Further, as shown in fig. 2, in this embodiment, the fourth pin of the dimming chip U1 also outputs a PWM control signal to the isolation optocoupler OP1-a through the seventh resistor R7.
Specifically, as shown in fig. 2, after the dimming signal (which may be a linear voltage of 0-10V, PWM, or resistor) at the input end passes through the first capacitor C1, the common mode inductor LF4, the input resistor R37, the first voltage regulator ZD1, and the second capacitor C2, the dimming chip U1 converts the dimming signal into a PWM control signal in the same proportion according to the proportion of the dimming signal, and outputs the PWM control signal from the fourth pin. The PWM control signal output from the fourth pin of the dimming chip U1 is divided into two paths.
The first path is as follows: the current is connected and output to the second end of the isolation optocoupler OP1-A through the seventh resistor R7, and the first end of the isolation optocoupler is connected to the third pin of the dimming chip U1, so that the current of the secondary output is controlled, and the purpose of dimming is achieved.
And a second path: after the integration processing is performed by the tenth resistor R10 and the seventh capacitor C7, the integrated signal is input to the negative input terminal of the operational amplifier U2, the reference signal generated by the third pin of the dimming chip U1 is divided by the eighth resistor R8 and the ninth resistor R9 and then input to the positive input terminal of the operational amplifier U2, the operational amplifier U2 compares signals at the positive and negative input terminals, and the output logic of the output terminal is controlled to be inverted according to the comparison result.
As shown in fig. 2, when the negative input terminal voltage of the operational amplifier U2 is greater than the positive input terminal voltage, the output terminal of the operational amplifier U2 outputs a low level, the low level is connected to the gate of the first switching tube Q1 through the twelfth resistor R12, so that the first switching tube Q1 is in an off state, the second switching tube Q2 is turned on, the light emitting diode of the photocoupler OP2 is turned on after current passes through, the receiving terminal of the photocoupler OP2 is also turned on, a bias current is provided to the base of the third switching tube Q3, the third switching tube Q3 is turned on, power (VCC voltage) is provided to the main control IC on the primary side, the main control IC operates normally, and the secondary side outputs dimming and operates normally.
When the voltage of the negative input end of the operational amplifier U2 is less than that of the positive input end, the output end of the operational amplifier U2 outputs a high level, and is connected to the gate of the first switch tube Q1 after passing through the twelfth resistor R12, so that the first switch tube Q1 is turned on, the second switch tube Q2 is turned off, the light emitting diode of the photoelectric coupler OP2 is in a cut-off state when no current passes through, the receiving end of the photoelectric coupler OP2 is also turned off, so that the base of the third switch tube Q3 is not biased, and the third switch tube Q3 is also in a cut-off state, so that the main control IC on the primary side has no power input, and the main control IC does not work, at this time, the output dimming circuit on the secondary side does not work, and dimming and turning off is achieved.
As shown in fig. 2, the value of the dimming turn-off point can be changed by adjusting the ratio of the eighth resistor R8 and the ninth resistor R9 (wherein, the eighth resistor R8 also belongs to the voltage comparison circuit), so as to meet the dimming turn-off requirements of different end products.
Of course, it can be understood that, in other embodiments, the smart dimming turn-off control circuit may also be designed without a turn-off function, at this time, the voltage comparison circuit and the device of the isolation transmission circuit 14 may be omitted, and a 0 ohm chip resistor may be attached to the position of the photoelectric coupler OP2, so that the PCB board and the outside may be shared without redesign, thereby greatly saving the design cost and the material management cost, and satisfying the selection of different product requirements.
According to the embodiment of the invention, the operational amplifier U2 and the optocoupler are adopted for feedback control, so that the current of the secondary output end can be controlled by adjusting the voltage of the primary input end, a control mode of complete primary and secondary isolation is realized, and the function of automatically adjusting the output current is achieved, so that the application field of the LED driving power supply can be greatly improved, and the functions are all patch devices and can be directly arranged in the driving power supply. If the function is not needed, only the device in the circuit is required to be not attached, the LAYOUT PCB is not required to be attached again, extra wiring and control nodes are not added, a full-hardware control mode is used, the reliability is high, and the adjustment of the output current derating percentage is simple.
The invention also provides a driving power supply which comprises the intelligent dimming turn-off control circuit disclosed by the embodiment of the invention. Optionally, the driving power source includes, but is not limited to, an LED driving power source, an LED display screen, an LED backlight, and the like.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (10)
1. A smart dimming turn-off control circuit, comprising: the dimming circuit comprises a dimming input circuit, a signal processing circuit, an isolation transmission circuit and a dimming turn-off circuit;
the dimming input circuit is used for receiving a dimming signal and processing the dimming signal so as to output a PWM control signal;
the signal processing circuit is connected with the dimming input circuit and is used for processing the PWM control signal;
the dimming turn-off circuit is connected with the signal processing circuit and the isolation transmission circuit, is switched on or switched off according to the signal output by the signal processing circuit and the control of the isolation transmission circuit, and is used for turning off the electric energy of the main control IC when the signal is switched off.
2. The smart dimming turn-off control circuit of claim 1, wherein the dimming input circuit comprises: a dimming signal receiving circuit and a PWM signal generating circuit;
the dimming signal receiving circuit is used for receiving a dimming signal and processing the dimming signal;
the PWM signal generating circuit is connected with the dimming signal receiving circuit, processes the signal output by the dimming signal receiving circuit and outputs the PWM control signal.
3. The smart dimming turn-off control circuit of claim 2, wherein the signal processing circuit is a voltage comparison circuit.
4. The smart dimming turn-off control circuit of claim 3, wherein the isolated transmission circuit comprises an opto-coupler.
5. The smart dimming turn-off control circuit of claim 4, wherein the dimming signal receiving circuit comprises: the circuit comprises a first capacitor, a common-mode inductor, an input resistor, a first voltage-regulator tube and a second capacitor;
the first end of the first capacitor is connected with the positive output end of the dimming circuit, the second end of the first capacitor is connected with the negative output end of the dimming circuit, the first end of the common-mode inductor is connected with the first end of the first capacitor, the second end of the common-mode inductor is connected with the second end of the first capacitor, the third end of the common-mode inductor is connected with the first end of the input resistor, and the fourth end of the common-mode inductor is grounded;
the second end of the input resistor is connected with the PWM signal generating circuit, the negative electrode of the first voltage-regulator tube is connected with the second end of the input resistor, the positive electrode of the first voltage-regulator tube is grounded, and the second capacitor is connected with the first voltage-regulator tube in parallel.
6. The smart dimming turn-off control circuit of claim 5, wherein the PWM signal generation circuit comprises: the third capacitor, the fourth capacitor, the sixth resistor and the dimming chip;
the fifth pin of the dimming chip is connected with the second end of the input resistor, the sixth pin of the dimming chip is grounded through the third capacitor, the seventh pin of the dimming chip is grounded through the fourth capacitor, the eighth pin of the dimming chip is grounded through the sixth resistor, and the fourth pin of the dimming chip outputs the PWM control signal.
7. The smart dimming turn-off control circuit of claim 6, wherein the voltage comparison circuit comprises: a tenth resistor, a seventh capacitor, a ninth resistor, an eighth capacitor, an eleventh resistor and an operational amplifier;
the first end of the tenth resistor is connected with the fourth pin of the dimming chip, the second end of the tenth resistor is connected with the negative input end of the operational amplifier, the negative input end of the operational amplifier is grounded through the seventh capacitor, the positive input end of the operational amplifier is grounded through the ninth resistor, the output end of the operational amplifier is connected with the dimming turn-off circuit, the eighth capacitor is connected with the ninth resistor in parallel, the first end of the eleventh resistor is connected with the positive input end of the operational amplifier, and the second end of the eleventh resistor is connected with the output end of the operational amplifier.
8. The smart dimming turn-off control circuit of claim 7, wherein the dimming turn-off circuit comprises: the first resistor, the second resistor, the third switch tube, the fourth switch tube and the fourth switch tube are connected in series;
a first end of the twelfth resistor is connected with an output end of the operational amplifier, a second end of the twelfth resistor is connected with a first end of the first resistor and a first end of the first switch tube, a second end of the first resistor is grounded, a third end of the first switch tube is grounded, a second end of the first switch tube is connected with a high level through the third resistor, a second end of the first switch tube is also connected with a first end of the second switch tube, a third end of the second switch tube is grounded, a second end of the second switch tube is connected with a second end of the photoelectric coupler, and a first end of the photoelectric coupler is connected with the high level through the second resistor;
the third end of the photoelectric coupler is connected with the first end of the third switching tube and the negative electrode of the second voltage-stabilizing tube, the positive electrode of the second voltage-stabilizing tube is grounded, the fourth end of the photoelectric coupler is connected with the third end of the third switching tube through a fifth resistor, and the second end of the third switching tube is connected with the power supply end of the master control IC.
9. The smart dimming turn-off control circuit according to claim 8, wherein the first switching tube and the second switching tube are MOS tubes, and the third switching tube is a triode.
10. A driving power supply comprising the smart dimming shutdown control circuit of any one of claims 1 to 9.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113905485A (en) * | 2021-11-11 | 2022-01-07 | 深圳市华浩德电子有限公司 | Analog-to-digital dimming circuit capable of setting shutdown point |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016145646A1 (en) * | 2015-03-19 | 2016-09-22 | Tridonic Gmbh & Co. Kg | Dimming method for led converter |
| CN108093523A (en) * | 2017-12-26 | 2018-05-29 | 深圳市崧盛电子股份有限公司 | AC dump and the control circuit and power supply of light modulation shut-off |
| CN110753428A (en) * | 2019-09-19 | 2020-02-04 | 浙江凯耀照明有限责任公司 | Isolation dimming circuit built by operational amplifier |
| CN211606889U (en) * | 2019-11-20 | 2020-09-29 | 广州视源电子科技股份有限公司 | Overvoltage protection circuit, constant current drive circuit, drive integrated circuit board and electronic equipment |
| CN211606850U (en) * | 2020-02-26 | 2020-09-29 | 广东省崧盛电源技术有限公司 | Non-isolated power supply turn-off control circuit and non-isolated power supply |
-
2021
- 2021-04-28 CN CN202110469971.0A patent/CN113365391B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016145646A1 (en) * | 2015-03-19 | 2016-09-22 | Tridonic Gmbh & Co. Kg | Dimming method for led converter |
| CN108093523A (en) * | 2017-12-26 | 2018-05-29 | 深圳市崧盛电子股份有限公司 | AC dump and the control circuit and power supply of light modulation shut-off |
| CN110753428A (en) * | 2019-09-19 | 2020-02-04 | 浙江凯耀照明有限责任公司 | Isolation dimming circuit built by operational amplifier |
| CN211606889U (en) * | 2019-11-20 | 2020-09-29 | 广州视源电子科技股份有限公司 | Overvoltage protection circuit, constant current drive circuit, drive integrated circuit board and electronic equipment |
| CN211606850U (en) * | 2020-02-26 | 2020-09-29 | 广东省崧盛电源技术有限公司 | Non-isolated power supply turn-off control circuit and non-isolated power supply |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113905485A (en) * | 2021-11-11 | 2022-01-07 | 深圳市华浩德电子有限公司 | Analog-to-digital dimming circuit capable of setting shutdown point |
| CN113905485B (en) * | 2021-11-11 | 2024-03-26 | 深圳市华浩德电子有限公司 | Analog-to-digital dimming circuit capable of setting off point |
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