CN213368192U - Lamp fault protection circuit - Google Patents
Lamp fault protection circuit Download PDFInfo
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- CN213368192U CN213368192U CN202022288061.6U CN202022288061U CN213368192U CN 213368192 U CN213368192 U CN 213368192U CN 202022288061 U CN202022288061 U CN 202022288061U CN 213368192 U CN213368192 U CN 213368192U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The application relates to a lamp fault protection circuit. The circuit comprises a decoding driver, wherein the output end of the decoding driver is connected with the LED lamp and used for driving and controlling the LED lamp; and the overvoltage protection circuit is connected with the output end of the decoding driver and used for detecting the output voltage of the output end of the decoding driver to obtain a voltage detection result, outputting a first control signal according to the voltage detection result and enabling the decoding driver to be switched on or switched off according to the first control signal. When the overvoltage protection circuit detects that the output voltage of the output end of the decoding driver is abnormal, the overvoltage protection circuit controls the decoding driver to be turned off, and the accident that components are burnt down when the output end of the decoding driver is in overvoltage or an external input power supply is mistakenly connected to the output end of the decoding driver is avoided.
Description
Technical Field
The application relates to the technical field of LED lighting, in particular to a lamp fault protection circuit.
Background
In outdoor view brightening engineering, the wiring problem puzzles many trades all the time, and current technical design scheme can satisfy the function demand of the full-color change of seven colours, can realize constant current drive LED spot light or line lamp, can realize multistage dimming through DMX512 controller. However, in the existing technical design scheme, no fault protection measure is taken for the output end of the LED lamp decoding driver, so that the output end of the LED lamp decoding driver cannot be prevented from being subjected to overvoltage or misconnection, and thus components are easily burnt.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the application provides a lamp fault protection circuit.
In a first aspect, the present application provides a lamp fault protection circuit, comprising:
the output end of the decoding driver is connected with the LED lamp and used for driving and controlling the LED lamp;
the overvoltage protection circuit is connected with the output end of the decoding driver and used for detecting the output voltage of the output end of the decoding driver to obtain a voltage detection result, outputting a first control signal according to the voltage detection result and enabling the decoding driver to be switched on or switched off according to the first control signal;
wherein, the voltage detection result includes normal and abnormal, the first control signal includes a first on signal and a first off signal, the outputting a first control signal to the decoding driver according to the voltage detection result, and making the decoding driver turn on or off according to the first control signal includes:
when the voltage detection result is normal, outputting the first conducting signal to the decoding driver according to the voltage detection result, and conducting the decoding driver;
and when the voltage detection result is abnormal, outputting the first turn-off signal to the decoding driver according to the voltage detection result, and turning off the decoding driver.
Optionally, the overvoltage protection circuit comprises:
the first comparison circuit is used for comparing the output voltage with a voltage threshold value to obtain the voltage detection result;
wherein, the first comparison circuit compares the output voltage with a voltage threshold to obtain the voltage detection result, and includes:
when the output voltage is larger than the voltage threshold value of the first comparison circuit, the obtained voltage detection result is abnormal;
and when the output voltage is less than or equal to the voltage threshold value of the first comparison circuit, the obtained voltage detection result is normal.
Optionally, the decoding driver includes therein:
and the constant current circuit is connected with the LED lamp and is used for providing a constant current power supply for the LED lamp.
Optionally, the decoding driver further comprises:
the decoding circuit is connected with the constant current circuit and used for outputting a dimming control signal to the constant current circuit and controlling the constant current circuit to output the constant current power supply according to the dimming control signal;
the decoding circuit is also connected with the overvoltage protection circuit and used for receiving the first control signal output by the overvoltage protection circuit and switching on or off according to the first control signal;
wherein the decoding circuit is turned on or off according to the first control signal, and comprises:
when the first control signal is a first conducting signal, the decoding circuit is conducted, and the decoding circuit is enabled to output the dimming control signal to the constant current circuit;
and when the first control signal is a first turn-off signal, turning off the decoding circuit, and enabling the decoding circuit to stop outputting the dimming control signal to the constant current circuit.
Optionally, the decoding driver further comprises:
and the automatic addressing circuit is connected with the decoding circuit and used for receiving an address signal and writing the address signal into the decoding circuit.
Optionally, the decoding driver further comprises:
and the transceiving circuit is connected with the decoding circuit and used for receiving the dimming signal and sending the dimming signal to the decoding circuit, so that the decoding circuit generates the dimming control signal according to the dimming signal.
Optionally, the decoding circuit comprises:
and the decoding chip is connected with the transceiving circuit and used for receiving the dimming signal, decoding the dimming signal and outputting the dimming control signal.
Optionally, the decoding driver further comprises:
and the switch constant voltage circuit is connected with the decoding circuit and used for converting an input power supply input into the decoding driver into a constant voltage power supply and providing the constant voltage power supply for the decoding driver.
Optionally, the lamp fault protection circuit further comprises:
and the overcurrent protection circuit is respectively connected with the constant current circuit and the switch constant voltage circuit and is used for detecting the input current input to the constant current circuit by the switch constant voltage circuit to obtain a current detection result, outputting a second control signal to the switch constant voltage circuit according to the current detection result and enabling the switch constant voltage circuit to be switched on or switched off according to the second control signal.
Wherein, the current detection result is normal and abnormal, the second control signal includes a second turn-on signal and a second turn-off signal, the overcurrent protection circuit outputs a second control signal to the switch constant voltage circuit according to the current detection result, and the switch constant voltage circuit is turned on or off according to the second control signal, including:
when the current detection result is normal, the over-current protection circuit outputs the second conduction signal to the switch constant voltage circuit to conduct the switch constant voltage circuit;
when the current detection result is abnormal, the overcurrent protection circuit outputs the second turn-off signal to the switch constant voltage circuit, turns off the switch constant voltage circuit, and prohibits the switch constant voltage circuit from outputting the constant voltage power supply.
Optionally, the over-current protection circuit includes:
the second comparison circuit is used for comparing the input current with a current threshold value to obtain a current detection result;
wherein, the second comparison circuit compares the input current with a current threshold to obtain the current detection result, and includes:
when the input current is larger than the current threshold value, the obtained current detection result is abnormal;
and when the input current is less than or equal to the current threshold value, the obtained current detection result is normal.
The lamp fault protection circuit comprises a decoding driver, wherein the output end of the decoding driver is connected with the LED lamp and used for driving and controlling the LED lamp; the overvoltage protection circuit is connected with the output end of the decoding driver and used for detecting the output voltage of the output end of the decoding driver to obtain a voltage detection result, outputting a first control signal according to the voltage detection result and enabling the decoding driver to be switched on or switched off according to the first control signal; when the voltage detection result is normal, outputting the first conducting signal to the decoding driver according to the voltage detection result, and conducting the decoding driver; and when the voltage detection result is abnormal, outputting the first turn-off signal to the decoding driver according to the voltage detection result, and turning off the decoding driver. When the overvoltage protection circuit detects that the output voltage of the output end of the decoding driver is abnormal, the overvoltage protection circuit controls the decoding driver to be turned off, and the accident that components are burnt out when the output end of the decoding driver is in overvoltage or an external input power supply is mistakenly connected to the output end of the decoding driver is avoided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
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, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
FIG. 1 is a logic block diagram of a lamp fault protection circuit in one embodiment;
FIG. 2 is a schematic diagram of the connection of an over-voltage protection circuit in one embodiment;
FIG. 3 is a logic block diagram of a lamp fault protection circuit in one embodiment;
FIG. 4 is a schematic diagram of the connection of a constant current circuit in one embodiment;
FIG. 5 is a logic block diagram of a lamp fault protection circuit in one embodiment;
FIG. 6 is a logic block diagram of a lamp fault protection circuit in one embodiment;
FIG. 7 is a schematic diagram of the connections of the automatic addressing circuitry in one embodiment;
FIG. 8 is a logic block diagram of a lamp fault protection circuit in one embodiment;
FIG. 9 is a schematic diagram of the connection of a transceiver circuit in one embodiment;
FIG. 10 is a schematic diagram of the connections of the decoding circuit in one embodiment;
FIG. 11 is a logic block diagram of a lamp fault protection circuit in one embodiment;
FIG. 12 is a schematic diagram showing the connection of a switching constant voltage circuit according to one embodiment;
FIG. 13 is a logic block diagram of a lamp fault protection circuit in one embodiment;
FIG. 14 is a schematic diagram of the connection of an over-current protection circuit in one embodiment;
fig. 15 is a connection diagram of a lamp fault protection circuit according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all 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 application.
In one embodiment, fig. 1 is a logic block diagram of a lamp fault protection circuit in one embodiment, and referring to fig. 1, a lamp fault protection circuit is provided. The lamp fault protection circuit specifically comprises a decoding driver 110, and an output end of the decoding driver is connected with the LED lamp 120 and used for driving and controlling the LED lamp 120. And the overvoltage protection circuit 130 is connected to the output end of the decoding driver 110, and is configured to detect a voltage at the output end of the decoding driver 110 to obtain a voltage detection result, and output a first control signal according to the voltage detection result, so that the decoding driver 110 is turned on or off according to the first control signal.
When the voltage detection result is normal, outputting the first on signal to the decoding driver 110 according to the voltage detection result, and turning on the decoding driver 110; when the voltage detection result is abnormal, the first shutdown signal is output to the decoding driver 110 according to the voltage detection result, and the decoding driver 110 is shut down.
Specifically, the decoding driver 110 is configured to drive and control the LED lamps 120, any number of LED lamps 120 may be adopted in practical use, the overvoltage protection circuit 130 collects the voltage condition at the output end of the decoding driver 110 in real time, that is, detects the voltage condition at the input end of the LED lamp 120, when the input end of the decoding driver 110 is connected to an external input power supply, the output end of the decoding driver 110 provides voltage for the LED lamp 120, that is, the output voltage at the output end of the decoding driver supplies power to the LED lamp; when the external input power supply is connected to the output end of the decoding driver in a wrong mode, the output voltage of the output end of the decoding driver is the voltage of the external input power supply at the moment. Obtaining a corresponding voltage detection result according to the detected voltage condition, and when the voltage detection result is normal, the overvoltage protection circuit 130 outputs a first conduction signal (high level) to the decoding driver 110, so that the decoding driver 110 continues to drive and control the LED lamp 120; when the voltage detection result is abnormal, the overvoltage protection circuit 130 outputs a first turn-off signal (low level) to the decoding driver 110, turns off the decoding driver 110, and prohibits the decoding driver 110 from continuously driving the LED lamp 120, so as to realize overvoltage protection of the output end of the decoding driver 110 and avoid IC burnout accidents caused by the wrong connection of an external input power source to the output end of the decoding driver.
In one embodiment, the overvoltage protection circuit 130 includes a first comparison circuit for comparing the output voltage with a voltage threshold to obtain the voltage detection result. When the output voltage is larger than the voltage threshold value of the first comparison circuit, the obtained voltage detection result is abnormal; and when the output voltage is less than or equal to the voltage threshold value of the first comparison circuit, the obtained voltage detection result is normal.
Specifically, referring to fig. 2, in this embodiment, the number of the LED lamps 120 is 4, which correspond to a red lamp, a green lamp, a blue lamp, and a white lamp, respectively, the diodes D10, D20, D30, and D40 in fig. 2 correspond to one LED lamp 120, the decoding driver 110 drives and controls the four LED lamps 120 at the same time, and the overvoltage protection circuit 130 collects input voltages of the four LED lamps 120 at the same time, that is, collects voltages at the output end of the decoding driver 110. The first comparison circuit comprises a comparator U1 and a comparator U2, the comparator U1 and the comparator U2 are both voltage comparators, the input voltage corresponding to each LED lamp 120 is compared with the voltage thresholds of the comparator U1 and the comparator U2 in the first comparison circuit, and if the input voltage corresponding to any one LED lamp 120 is greater than the voltage threshold, the voltage detection result is determined to be abnormal; if the input voltage corresponding to each LED lamp 120 is less than or equal to the voltage threshold, the voltage detection result is determined to be normal.
In one embodiment, referring to fig. 3, the decoding driver 110 includes therein:
and the constant current circuit 111 is connected with the LED lamp 120 and is used for providing a constant current power supply for the LED lamp 120.
Specifically, referring to fig. 4, the number of output channels of the constant current circuit 111 is the same as the number of the LED lamps 120, the number of output channels of the constant current circuit 111 corresponding to the four LED lamps 120 is four, and the output channels correspond to the R channel, the G channel, the B channel, and the W channel, respectively, that is, the second end of the resistor R110 in fig. 4 is used as one output channel (any one of the R channel, the G channel, the B channel, and the W channel) of the constant current circuit 111, one output channel of the constant current circuit 111 is connected to the negative electrode of one LED lamp 120, only the constant current circuit 111 having one output channel is disclosed in fig. 4, and the four constant current circuits 111 have four circuits shown in fig. 4 connected in parallel.
In fig. 4, the first end of the resistor R110 is connected to the overvoltage protection circuit 130, that is, the first end of the resistor R110 is connected to the positive electrode of a diode (any one of a diode D10, a diode D20, a diode D30, and a diode D40) in the overvoltage protection circuit 130, so that the overvoltage protection circuit 130 detects the voltage condition at the output end of the constant current circuit 111 in real time.
In one embodiment, referring to fig. 5, the decoding driver 110 further includes a decoding circuit 112 connected to the constant current circuit 111, and configured to output a dimming control signal to the constant current circuit 111, and control the constant current circuit 111 to output the constant current power according to the dimming control signal; the decoding circuit 112 is further connected to the overvoltage protection circuit 130, and is configured to receive the first control signal output by the overvoltage protection circuit 130, and turn on or off according to the first control signal.
When the first control signal is a first on signal, the decoding circuit 112 is turned on, so that the decoding circuit 112 outputs the dimming control signal to the constant current circuit 111; when the first control signal is a first off signal, the decoding circuit 112 is turned off, and the decoding circuit 112 stops outputting the dimming control signal to the constant current circuit 111.
Specifically, the decoding circuit 112 outputs a dimming control signal (PWM, pulse width modulation signal), and adjusts the output current of the constant current circuit 111 according to the dimming control signal, so as to control the dimming of the plurality of LED lamps 120. And the decoding circuit 112 further receives a first control signal sent by the overvoltage protection circuit 130, and turns on or off according to the first control signal.
Based on the embodiment of obtaining the voltage detection result by the overvoltage protection circuit 130, if the voltage detection result detected by the overvoltage protection circuit 130 is normal, a high level is output to the decoding circuit 112, so that the decoding circuit 112 continues to output the dimming control signal to the constant current circuit 111; if the voltage detection result detected by the overvoltage protection circuit 130 is abnormal, a low level is output to the decoding circuit 112, the decoding circuit 112 is prohibited from continuously outputting the dimming control signal to the constant current circuit 111, and the constant current circuit 111 is turned off, so that overvoltage protection of the output end of the decoding driver 110 is realized, and IC burnout accidents caused by overvoltage of the output end of the decoding driver or error connection of an external input power supply to the output end of the decoding driver are avoided.
In one embodiment, referring to fig. 6, the decoding driver 110 further includes:
and an automatic addressing circuit 113 connected to the decoding circuit 112 for receiving an address signal and writing the address signal into the decoding circuit 112.
Specifically, referring to fig. 7, an address signal input terminal of the automatic addressing circuit 113 is configured to receive an address signal issued by a host, and the communication chip U7 writes the address signal into a decoding chip of the decoding circuit 112, so as to implement setting and modifying of an encoded address in the decoding circuit 112. In fig. 7, the diodes D6 and D7 are transient suppression diodes, and the diodes D6, D7, the fuse F1 and the fuse F2 are used as protection devices to prevent the circuit from high-energy impact and protect the circuit from safety.
In one embodiment, referring to fig. 8, the decoding driver 110 further includes:
and a transceiver circuit 114, connected to the decoder circuit 112, for receiving a dimming signal, sending the dimming signal to the decoder circuit 112, and enabling the decoder circuit 112 to generate the dimming control signal according to the dimming signal.
Specifically, referring to fig. 9, the transceiver circuit 114 includes a communication chip U7, the communication chip may specifically adopt any integrated chip capable of implementing a communication function, in this embodiment, a communication chip with a model of MAX13085E is adopted, a signal receiving end of the transceiver circuit 114 is configured to receive a DMX512 dimming signal issued by a host, and transmit the dimming signal to the decoder circuit 112 through the communication chip U7, so that the decoder circuit 112 decodes the dimming signal and outputs a PWM dimming control signal, and the PWM dimming control signal is used to control an output current of the constant current circuit 111, so as to implement dimming control of the LED lamp 120.
In one embodiment, referring to fig. 10, the decoding circuit 112 includes:
and the decoding chip is connected with the transceiver circuit 114 and is used for receiving the dimming signal, decoding the dimming signal and outputting the dimming control signal.
Specifically, the decoding circuit 112 includes a decoding chip U8, and the decoding chip U8 receives the DMX512 dimming signal from the transceiver circuit 114, decodes the DMX512 dimming signal, outputs a PWM dimming control signal to the constant current circuit 111, and controls the output current of the constant current circuit 111, thereby implementing the dimming processing on the LED lamp 120. Referring to fig. 8, the thirteenth pin PWM1, and/or the fourteenth pin PWM2, and/or the sixteenth pin PWM3, and/or the seventeenth pin PWM4 of the decoding chip U8 are connected to the constant current circuit 111, and are configured to output a PWM dimming control signal to the constant current circuit 111 to control each LED lamp 120 respectively.
The decoding chip U8 is further connected to the overvoltage protection circuit 130, and is configured to receive the first control signal output by the overvoltage protection circuit 130, and implement turning on or off according to the first control signal. When the first control signal is at a high level (i.e., INT ═ 1), the decoding circuit 112 is turned on; the first control signal is low (i.e., INT ═ 0), and the decoding circuit 112 is turned off.
In one embodiment, referring to fig. 11, the decoding driver 110 further includes:
and a switching constant voltage circuit 115 connected to the decoding circuit 112 and supplying a constant voltage power to the decoding driver 110.
Specifically, referring to fig. 12, the input end of the switching constant voltage circuit 115 is configured to receive input power supplies VCC and GND (4.75V to 32V), and convert the input power supplies into a constant voltage power supply of +5V, the constant voltage power supply supplies power to all circuits requiring a power supply of +5V in the decoding driver 110, that is, all circuits requiring a power supply of +5V are connected to the output end of the switching constant voltage circuit 115, so as to ensure reliable operation of the decoding driver 110, and the second end of the inductor L1 in fig. 12 is used as the output end of the switching constant voltage circuit 115.
In one embodiment, referring to fig. 13, the lamp fault protection circuit further comprises:
and the overcurrent protection circuit 116 is connected to the constant current circuit 111 and the switch constant voltage circuit 115, and configured to detect an input current input to the constant current circuit 111 by the switch constant voltage circuit 115 to obtain a current detection result, and output a second control signal to the switch constant voltage circuit 115 according to the current detection result, so that the switch constant voltage circuit 115 is turned on or off according to the second control signal.
When the current detection result is normal, the over-current protection circuit 116 outputs the second on signal to the switch constant voltage circuit 115 to turn on the switch constant voltage circuit 115; when the current detection result is abnormal, the overcurrent protection circuit 116 outputs the second turn-off signal to the switching constant voltage circuit 115, turns off the switching constant voltage circuit 115, and prohibits the switching constant voltage circuit 115 from outputting the constant voltage power supply.
Specifically, the overcurrent protection circuit 116 is connected between the switch constant voltage circuit 115 and the constant current circuit 111, the overcurrent protection circuit 116 receives a +5V constant voltage power supply provided by the switch constant voltage circuit 115, and meanwhile, the overcurrent protection circuit 116 detects a current condition input to the constant current circuit 111 to obtain a corresponding current detection result, and the overcurrent protection circuit 116 outputs a second control signal to the switch constant voltage circuit 115 according to the current detection result. If the current detection result is normal, a second on signal (i.e., a high level) is output to the switching constant voltage circuit 115 through the enable terminal of the over-current protection circuit 116, and the switching constant voltage circuit 115 continues to convert the input power supply into a constant voltage power supply to supply power to each circuit in the decoding driver 110; if the current detection result is abnormal, the overcurrent protection circuit 116 outputs a second turn-off signal (i.e., a low level) to the switching constant voltage circuit 115, turns off the switching constant voltage circuit 115, prohibits the switching constant voltage circuit 115 from continuing to convert the power supply, and also stops supplying power to each circuit of the decoding driver 110, thereby preventing the components from being damaged by a large current, and thus implementing overcurrent protection.
In one embodiment, the over-current protection circuit 116 includes:
and the second comparison circuit is used for comparing the input current with a current threshold value to obtain the current detection result.
When the input current is larger than the current threshold, the obtained current detection result is abnormal; and when the input current is less than or equal to the current threshold value, the obtained current detection result is normal.
Specifically, referring to fig. 14, the second comparison circuit includes a comparator U5 and a comparator U6, the comparators U5 and U6 are current comparators, the overcurrent protection circuit 116 collects an input current flowing into the constant current circuit 111 in real time, the input current is compared with current thresholds of the comparators U5 and U6 to obtain a current detection result, if the input current is greater than the current threshold, the current detection result is abnormal, the overcurrent protection circuit 116 outputs a low level (that is, EN is 0) to the switch constant voltage circuit 115, and the switch constant voltage circuit 115 is controlled to be turned off, so that overcurrent protection of the decoding driver 110 is realized; when the input current is equal to or less than the current threshold, the current detection result is normal, the overcurrent protection circuit 116 outputs a high level (that is, EN is 1) to the switching constant voltage circuit 115, and the switching constant voltage circuit 115 is controlled to be turned on to continue generating the constant voltage power supply.
In one embodiment, referring to fig. 15, the input power VCC, GND (4.75V to 32V) is converted into a +5V constant voltage power through the switching constant voltage circuit 115, the +5V constant voltage power supplies power to the decoding circuit 112, the automatic addressing circuit 113, the transceiving circuit 114, and the overcurrent protection circuit 116, the constant voltage power supplies provide a load power to the constant current circuit 111 through the overcurrent protection circuit 116, and the load power is further connected to the anode of the LED lamp 120 through the diode D0. The automatic address circuit 113 receives an address signal and automatically changes the encoded address of the decoding circuit 112 according to the address signal. The transceiver circuit 114 receives the DMX512 dimming signal and sends the DMX512 dimming signal to the decoder circuit 112, the decoder circuit 112 decodes the dimming signal to output a PWM dimming control signal, and controls the constant current chip in the constant current circuit 111, so as to control the output current of the constant current circuit 111 at 0-255 level or (0-65535 level). The overvoltage protection circuit 130 detects the output voltage of the constant current circuit 111 in real time, a voltage comparator is arranged in the overvoltage protection circuit 130, when the output voltage is larger than a preset voltage threshold, the overvoltage protection circuit 130 outputs a low level to the decoding circuit 112, the decoding circuit 112 is forbidden to continue outputting a PWM signal, and the constant current circuit 111 is switched off, so that overvoltage protection of the decoding driver 110 is realized. When the overcurrent protection circuit 116 detects that the current output from the switch constant voltage circuit 115 to the constant current circuit 111 is greater than the preset current threshold, the overcurrent protection circuit 116 outputs a low level to the switch constant voltage circuit 115 to turn off the switch constant voltage circuit 115, thereby implementing overcurrent protection of the decoding driver 110.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be 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. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, circuit, 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, circuit, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, circuit, article, or apparatus that comprises the element.
The above description is only exemplary of the invention, and is intended to enable those skilled in the art to understand and implement the 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 (10)
1. A lamp fault protection circuit, comprising:
the output end of the decoding driver is connected with the LED lamp and used for driving and controlling the LED lamp;
the overvoltage protection circuit is connected with the output end of the decoding driver and used for detecting the output voltage of the output end of the decoding driver to obtain a voltage detection result, outputting a first control signal according to the voltage detection result and enabling the decoding driver to be switched on or switched off according to the first control signal;
wherein, the voltage detection result includes normal and abnormal, the first control signal includes a first on signal and a first off signal, the outputting a first control signal to the decoding driver according to the voltage detection result, and making the decoding driver turn on or off according to the first control signal includes:
when the voltage detection result is normal, outputting the first conducting signal to the decoding driver according to the voltage detection result, and conducting the decoding driver;
and when the voltage detection result is abnormal, outputting the first turn-off signal to the decoding driver according to the voltage detection result, and turning off the decoding driver.
2. The circuit of claim 1, wherein the overvoltage protection circuit comprises:
the first comparison circuit is used for comparing the output voltage with a voltage threshold value to obtain the voltage detection result;
wherein, the first comparison circuit compares the output voltage with a voltage threshold to obtain the voltage detection result, and includes:
when the output voltage is larger than the voltage threshold value of the first comparison circuit, the obtained voltage detection result is abnormal;
and when the output voltage is less than or equal to the voltage threshold value of the first comparison circuit, the obtained voltage detection result is normal.
3. The circuit of claim 1, wherein the decode driver comprises:
and the constant current circuit is connected with the LED lamp and is used for providing a constant current power supply for the LED lamp.
4. The circuit of claim 3, wherein the decode driver further comprises:
the decoding circuit is connected with the constant current circuit and used for outputting a dimming control signal to the constant current circuit and controlling the constant current circuit to output the constant current power supply according to the dimming control signal;
the decoding circuit is also connected with the overvoltage protection circuit and used for receiving the first control signal output by the overvoltage protection circuit and switching on or off according to the first control signal;
wherein the decoding circuit is turned on or off according to the first control signal, and comprises:
when the first control signal is a first conducting signal, the decoding circuit is conducted, and the decoding circuit is enabled to output the dimming control signal to the constant current circuit;
and when the first control signal is a first turn-off signal, turning off the decoding circuit, and enabling the decoding circuit to stop outputting the dimming control signal to the constant current circuit.
5. The circuit of claim 4, wherein the decode driver further comprises:
and the automatic addressing circuit is connected with the decoding circuit and used for receiving an address signal and writing the address signal into the decoding circuit.
6. The circuit of claim 4, wherein the decode driver further comprises:
and the transceiving circuit is connected with the decoding circuit and used for receiving the dimming signal and sending the dimming signal to the decoding circuit, so that the decoding circuit generates the dimming control signal according to the dimming signal.
7. The circuit of claim 6, wherein the decoding circuit comprises:
and the decoding chip is connected with the transceiving circuit and used for receiving the dimming signal, decoding the dimming signal and outputting the dimming control signal.
8. The circuit of claim 7, wherein the decode driver further comprises:
and the switch constant voltage circuit is connected with the decoding circuit and used for converting an input power supply input into the decoding driver into a constant voltage power supply and providing the constant voltage power supply for the decoding driver.
9. The circuit of claim 8, wherein the lamp fault protection circuit further comprises:
the overcurrent protection circuit is respectively connected with the constant current circuit and the switch constant voltage circuit and is used for detecting the input current input to the constant current circuit by the switch constant voltage circuit to obtain a current detection result, outputting a second control signal to the switch constant voltage circuit according to the current detection result and enabling the switch constant voltage circuit to be switched on or switched off according to the second control signal;
wherein, the current detection result is normal and abnormal, the second control signal includes a second turn-on signal and a second turn-off signal, the overcurrent protection circuit outputs a second control signal to the switch constant voltage circuit according to the current detection result, and the switch constant voltage circuit is turned on or off according to the second control signal, including:
when the current detection result is normal, the over-current protection circuit outputs the second conduction signal to the switch constant voltage circuit to conduct the switch constant voltage circuit;
when the current detection result is abnormal, the overcurrent protection circuit outputs the second turn-off signal to the switch constant voltage circuit, turns off the switch constant voltage circuit, and prohibits the switch constant voltage circuit from outputting the constant voltage power supply.
10. The circuit of claim 9, wherein the over-current protection circuit comprises:
the second comparison circuit is used for comparing the input current with a current threshold value to obtain a current detection result;
wherein, the second comparison circuit compares the input current with a current threshold to obtain the current detection result, and includes:
when the input current is larger than the current threshold value, the obtained current detection result is abnormal;
and when the input current is less than or equal to the current threshold value, the obtained current detection result is normal.
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| CN202022288061.6U CN213368192U (en) | 2020-10-14 | 2020-10-14 | Lamp fault protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113891521A (en) * | 2021-11-05 | 2022-01-04 | 深圳市角度控光智能照明技术有限公司 | PWM chopping dimming redundant circuit and chopping dimming method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113891521A (en) * | 2021-11-05 | 2022-01-04 | 深圳市角度控光智能照明技术有限公司 | PWM chopping dimming redundant circuit and chopping dimming method thereof |
| CN113891521B (en) * | 2021-11-05 | 2023-09-19 | 深圳市角度控光智能照明技术有限公司 | PWM chopping dimming redundant circuit and chopping dimming method thereof |
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Address after: 518000 Floor 18, Block B, Building 12, Shenzhen Bay Science and Technology Ecological Park, Nanshan District, Shenzhen City, Guangdong Province Patentee after: Lyad Smart Technology Group Co.,Ltd. Address before: 518000 508, jiaanda building, 110 Huafan Road, Tongsheng community, Dalang street, Longhua District, Shenzhen City, Guangdong Province Patentee before: LEYARD LIGHTING CO.,LTD. |
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