CN116647959A - Dimming interface protection circuit of dimming power supply - Google Patents
Dimming interface protection circuit of dimming power supply Download PDFInfo
- Publication number
- CN116647959A CN116647959A CN202310832113.7A CN202310832113A CN116647959A CN 116647959 A CN116647959 A CN 116647959A CN 202310832113 A CN202310832113 A CN 202310832113A CN 116647959 A CN116647959 A CN 116647959A
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- Prior art keywords
- circuit
- dimming
- suppressor
- input
- protection circuit
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 17
- 238000011084 recovery Methods 0.000 claims abstract description 10
- 230000001052 transient effect Effects 0.000 claims abstract description 5
- 239000000872 buffer Substances 0.000 claims description 8
- 230000003139 buffering effect Effects 0.000 claims description 3
- 230000001939 inductive effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 description 9
- 230000009471 action Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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- 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]
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
-
- 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
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/20—Responsive to malfunctions or to light source life; for protection
- H05B47/24—Circuit arrangements for protecting against overvoltage
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The embodiment of the invention provides a dimming interface protection circuit of a dimming power supply, which relates to the technical field of protection circuits and comprises the following components: input protection circuit, dimmer circuit, digital conversion circuit, wherein, input protection circuit includes: an alternating current, AC, input, a self-healing fuse, a suppressor circuit, a rectifier diode circuit; the AC input end is used for being connected with the first end of the self-recovery fuse; the second end of the self-recovery fuse is connected with the first end of the suppressor circuit, and the second end of the suppressor circuit is connected with the first end of the rectifier diode circuit; wherein the suppressor circuit comprises at least one transient voltage suppressor TVS; the second end of the rectifying diode circuit is connected with the dimming circuit. By applying the scheme provided by the embodiment of the invention, the dimming circuit and the dimming interface can be protected when the dimming line is connected with the alternating current input end in a wrong way.
Description
Technical Field
The invention relates to the technical field of protection circuits, in particular to a dimming interface protection circuit of a dimming power supply.
Background
The most widely used dimming power supply for the LED dimming is a 0-10V dimming power supply, but a lot of operators and even technicians can misconnect dimming light to an AC (Alternating Current ) input end in market application. The high voltage of the dimming line can cause circuit damage, influence the function of the dimming interface for subsequently receiving the electric signal, and further have life safety hidden trouble.
Disclosure of Invention
The embodiment of the invention aims to provide a dimming interface protection circuit of a dimming power supply, which is used for protecting a dimming circuit and a dimming interface when a dimming line is connected with an alternating current input end in a wrong way. The specific technical scheme is as follows:
the embodiment of the invention provides a dimming interface protection circuit of a dimming power supply, which comprises the following components: an input protection circuit, a dimming circuit and a digital conversion circuit, wherein,
the input protection circuit includes: an alternating current, AC, input, a self-healing fuse, a suppressor circuit, a rectifier diode circuit;
the AC input end is used for being connected with the first end of the self-recovery fuse;
a second end of the self-recovery fuse is connected with a first end of the suppressor circuit, and a second end of the suppressor circuit is connected with a first end of the rectifier diode circuit; wherein the suppressor circuit comprises at least one transient voltage suppressor TVS;
the second end of the rectifying diode circuit is connected with the dimming circuit;
the dimming circuit includes: a voltage amplifier and a voltage follower;
the voltage amplifier is used for boosting the current provided by the rectifier diode circuit and sending the obtained boosted current to the voltage follower,
the voltage follower is used for buffering the received boost current and outputting a buffer current to the digital conversion circuit;
the digital conversion circuit is used for converting the buffer current into a PWM (Pulse Width Modulation ) signal and outputting the PWM signal to the dimming interface.
Optionally, the input protection circuit further comprises an inductance circuit;
a second terminal of the suppressor circuit is connected to a first terminal of the rectifier diode circuit, comprising:
the second end of the suppressor circuit and the first end of the rectifier diode circuit are respectively connected to the first end and the second end of the inductance circuit.
Optionally, the digital conversion circuit outputs the PWM signal to a dimming interface, including:
the digital switching circuit sends the PWM signal to a dimming interface through a preset optocoupler.
Optionally, the voltage amplifier and the voltage follower are connected through a light emitting diode.
Optionally, the voltage amplifier is an in-phase voltage amplifier.
The beneficial effects are that:
when the dimming line with higher voltage is mistakenly connected to the alternating current input end, the self-recovery fuse impedance is increased, the TVS in the suppressor circuit clamps the passing abnormal overvoltage to the rated voltage value, circuit damage is avoided, then the rectifier diode circuit is reversely cut off, so that current is not supplied to the protection dimming circuit and the digital conversion circuit, the function of the dimming circuit is not damaged, the overvoltage current does not pass through the dimming interface, and the protection of the dimming circuit and the dimming interface is realized.
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.
Fig. 1 is a schematic structural diagram of a first protection circuit for a dimming interface of a photovoltaic power supply according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a second protection circuit for a dimming interface of a photovoltaic power supply according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention.
Referring to fig. 1, in one embodiment of the present invention, there is provided a schematic structural diagram of a dimming interface protection circuit of a dimming power supply, including: an input protection circuit, a dimming circuit and a digital conversion circuit, wherein,
the input protection circuit includes: an alternating current, AC, input, a self-healing fuse, a suppressor circuit, a rectifier diode circuit;
the AC input end is used for being connected with the first end of the self-recovery fuse;
a second end of the self-recovery fuse is connected with a first end of the suppressor circuit, and a second end of the suppressor circuit is connected with a first end of the rectifier diode circuit; wherein the suppressor circuit comprises at least one transient voltage suppressor TVS;
the second end of the rectifying diode circuit is connected with the dimming circuit;
the dimming circuit includes: a voltage amplifier and a voltage follower;
the voltage amplifier is used for boosting the current provided by the rectifier diode circuit and sending the obtained boosted current to the voltage follower,
the voltage follower is used for buffering the received boost current and outputting a buffer current to the digital conversion circuit;
the digital conversion circuit is used for converting the buffer current into a Pulse Width Modulation (PWM) signal and outputting the PWM signal to the dimming interface.
The alternating current AC input end is used for being connected with 0-10V alternating current, and under the condition of being connected with 230V and other high-voltage currents, the scheme provided by the embodiment plays a role in protection. DIM +, DIM-in fig. 2 represents the AC input.
Wherein the rectifier diode circuit comprises at least one rectifier diode. The rectifier diode circuit shown in fig. 2 includes a diode, and the AC input protection circuit shown in fig. 2 is the input protection circuit in the foregoing embodiment, and D12 on the right side of the resistor R3 is the rectifier diode. In the figure, a device with an arbitrary number starting with "R" is a resistor in the circuit, and a device with an arbitrary number starting with "C" is a capacitor in the circuit; devices beginning with "ZD" are all zener diodes, such as "ZD3NC" in fig. 2, etc., and will not be described in detail in the following embodiments.
The self-healing fuse in fig. 2 is a PTC in an AC input protection circuit.
Also shown in fig. 2 is the circuit configuration when the suppressor circuit comprises two TVS (Transient Voltage Suppressor ), namely D6, D9 in the figure; more or fewer TVS may also be provided between the components LF3, PTC.
A TVS is a device in which at least a single PN junction is formed or a plurality of PN junctions are integrated, the PN junction being a junction composed of an N-type semiconductor and a P-type semiconductor.
In the dimming circuit, the voltage amplifier is U2A in fig. 2, and the voltage follower corresponds to U2B in fig. 2.
The voltage follower buffers the boost current to reduce the impedance of the current input to the voltage follower, the obtained buffer current is a low impedance current, and the output voltage and the input voltage are kept unchanged. The resulting low impedance current increases the load capacity of the circuit.
A special PWM chip, such as a UC3842 chip, may be used in the digital conversion circuit to convert the buffered current into a PWM signal. The chip may be disposed in U1 of fig. 2. The 5 pin of U1 is output to the positive pole of the light coupling to be transmitted to the IC light modulation port, and the circuit part of the light modulation PWM is connected in the figure.
From the above, when the dimming line with higher voltage is erroneously connected to the ac input end, the self-recovery fuse impedance increases, the TVS in the suppressor circuit clamps the passing abnormal overvoltage to the rated voltage value, so as to avoid circuit damage, and then the rectifier diode circuit is turned off reversely, so that no current is provided to the protection dimming circuit and the digital conversion circuit, the function of the dimming circuit is not damaged, and the overvoltage current also does not pass through the dimming interface, thereby realizing the protection of the dimming circuit and the dimming interface.
In one embodiment of the present invention, the input protection circuit further includes an inductance circuit;
a second terminal of the suppressor circuit is connected to a first terminal of the rectifier diode circuit, comprising:
the second end of the suppressor circuit and the first end of the rectifier diode circuit are respectively connected to the first end and the second end of the inductance circuit.
The inductor in the inductor circuit can be made of chokes, so that interference radiation is suppressed, interference current can be reversed in different coils when passing through the inductor circuit, and electromagnetic compatibility of the system is improved.
In fig. 2, LF3 is a common mode inductance on the inductance circuit, and the left and right sides of LF3 are respectively connected to the suppressor circuit and the rectifier diode circuit.
In one embodiment of the present invention, the digital conversion circuit outputs the PWM signal to a dimming interface, including:
the digital switching circuit sends the PWM signal to a dimming interface through a preset optocoupler.
The optocoupler comprises a light emitter and a light receiver, and an infrared light emitting diode serving as the light emitter and a photosensitive semiconductor tube serving as the light receiver can be packaged in the same tube shell. When the input end is powered on, the light emitter emits light, and the light receiver receives the light to generate photocurrent, which flows out from the output end, so that the electric-optical-electric conversion is realized.
The optical coupler has good isolation effect on input and output electric signals, can provide certain electrical safety, and further enhances the protection effect of the protection circuit.
In one embodiment of the present invention, the voltage amplifier and the voltage follower are connected through a light emitting diode.
The light emitting diode emits light when current passes between the voltage amplifier and the voltage follower, so that the protection circuit can be prompted to work, and the situation that the AC input end is connected by mistake can be prompted. As shown in fig. 2, U2A and U2B are connected by passing through a diode D2.
The voltage amplifier may be an in-phase voltage amplifier or the like.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for the method, algorithm transaction server, and storage medium embodiments, the description is relatively simple, as it is substantially similar to the method embodiments, with reference to the partial description of the method embodiments being relevant.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (5)
1. A dimming interface protection circuit for a dimming power supply, comprising: an input protection circuit, a dimming circuit and a digital conversion circuit, wherein,
the input protection circuit includes: an alternating current, AC, input, a self-healing fuse, a suppressor circuit, a rectifier diode circuit;
the AC input end is used for being connected with the first end of the self-recovery fuse;
a second end of the self-recovery fuse is connected with a first end of the suppressor circuit, and a second end of the suppressor circuit is connected with a first end of the rectifier diode circuit; wherein the suppressor circuit comprises at least one transient voltage suppressor TVS;
the second end of the rectifying diode circuit is connected with the dimming circuit;
the dimming circuit includes: a voltage amplifier and a voltage follower;
the voltage amplifier is used for boosting the current provided by the rectifier diode circuit and sending the obtained boosted current to the voltage follower,
the voltage follower is used for buffering the received boost current and outputting a buffer current to the digital conversion circuit;
the digital conversion circuit is used for converting the buffer current into a Pulse Width Modulation (PWM) signal and outputting the PWM signal to the dimming interface.
2. The protection circuit of claim 1, wherein the input protection circuit further comprises an inductive circuit;
a second terminal of the suppressor circuit is connected to a first terminal of the rectifier diode circuit, comprising:
the second end of the suppressor circuit and the first end of the rectifier diode circuit are respectively connected to the first end and the second end of the inductance circuit.
3. The protection circuit of claim 1, wherein the digital conversion circuit outputs the PWM signal to a dimming interface, comprising:
the digital switching circuit sends the PWM signal to a dimming interface through a preset optocoupler.
4. The protection circuit of claim 1, wherein the voltage amplifier and the voltage follower are connected by a light emitting diode.
5. The protection circuit of claim 1, wherein the voltage amplifier is an in-phase voltage amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310832113.7A CN116647959A (en) | 2023-07-07 | 2023-07-07 | Dimming interface protection circuit of dimming power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310832113.7A CN116647959A (en) | 2023-07-07 | 2023-07-07 | Dimming interface protection circuit of dimming power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116647959A true CN116647959A (en) | 2023-08-25 |
Family
ID=87615637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310832113.7A Pending CN116647959A (en) | 2023-07-07 | 2023-07-07 | Dimming interface protection circuit of dimming power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116647959A (en) |
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2023
- 2023-07-07 CN CN202310832113.7A patent/CN116647959A/en active Pending
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