CN210042301U - Fault detection device and system of lamp control system - Google Patents
Fault detection device and system of lamp control system Download PDFInfo
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- CN210042301U CN210042301U CN201920348643.3U CN201920348643U CN210042301U CN 210042301 U CN210042301 U CN 210042301U CN 201920348643 U CN201920348643 U CN 201920348643U CN 210042301 U CN210042301 U CN 210042301U
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Abstract
The embodiment of the application provides a lamp control system's fault detection device and system, and the device includes: an inverter, an output voltage detection circuit, and a first output unit; the power supply end of the reverser is connected with a first power supply, the input end of the reverser is connected with a first grounding end, the grounding end of the reverser is connected with a second grounding end, and the output end of the reverser is connected with the first output unit; the first input end of the output voltage detection circuit is connected with the positive electrode of the LED, the second input end of the output voltage detection circuit is connected with the negative electrode of the LED, the grounding end of the output voltage detection circuit is connected with the second grounding end, and the output end of the output voltage detection circuit is connected with the first output unit. The device that this application embodiment provided can solve and can't discover the inefficacy problem of LED illumination fast among the prior art, and then has reduced the problem of the experience sense of lighting environment.
Description
Technical Field
The embodiment of the application relates to the technical field of fault detection of lamp control systems, in particular to a fault detection device and system of a lamp control system.
Background
With the popularization of Light-Emitting Diode (LED) lighting, LED power supplies (driving power supplies for LEDs) have been developed in a long time, and have been developed in a direction of miniaturization, intellectualization, high efficiency, and low cost.
But with the attendant increased failure rate of LED lighting, LED power and LEDs are the primary failure causes in failed LED products. Especially in the commercial lighting field, failure of LED products can cause poor user experience.
Therefore, the failure problem of the LED cannot be found quickly in the prior art, and further cannot be reported and repaired quickly in time, so that the value of the lighting product (lamp) and the experience of the lighting environment are reduced.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a lamp control system's fault detection device and system to overcome the inefficacy problem that can't discover LED illumination fast among the prior art, and then reduced the problem of the experience sense of lighting environment.
In a first aspect, an embodiment of the present application provides a fault detection device for a lamp control system, including:
an inverter, an output voltage detection circuit, and a first output unit;
the power supply end of the reverser is connected with a first power supply, the input end of the reverser is connected with a first grounding end, the grounding end of the reverser is connected with a second grounding end, the output end of the reverser is connected with the first output unit, and the reverser is used for detecting whether the LED power supply control chip has faults or not;
the first input end of the output voltage detection circuit is connected with the anode of the LED, the second input end of the output voltage detection circuit is connected with the cathode of the LED, the grounding end of the output voltage detection circuit is connected with the second grounding end, the output end of the output voltage detection circuit is connected with the first output unit, and the output voltage detection circuit is used for detecting whether the LED power supply has a fault when the LED power supply control chip is normal;
the first output unit is used for indicating whether the LED power supply control chip has a fault or not or whether the LED power supply has a fault or not;
the first power supply is used for supplying power to the LED power supply control chip, the output end of the LED power supply is connected with the LED, the LED power supply is used for supplying power to the LED, and the voltage of the second input end of the output voltage detection circuit is smaller than the rated voltage of the LED.
In one possible design, the display panel includes a plurality of pixel rows arranged in parallel, each pixel row including a plurality of pixels.
In one possible design, the inverter includes: the circuit comprises a first field effect transistor, a second field effect transistor, a first resistor, a second resistor and a third resistor;
a source electrode of the first field effect transistor is connected with one end of the first resistor, a drain electrode of the first field effect transistor is connected with the second grounding end, a grid electrode of the first field effect transistor is respectively connected with one end of the second resistor and a source electrode of the second field effect transistor, and the source electrode of the first field effect transistor is an output end of the inverter;
the other end of the first resistor is connected with the other end of the second resistor, and a port formed by connecting the other end of the first resistor with the other end of the second resistor is a power supply end of the reverser;
the drain electrode of the second field effect transistor is connected with one end of the third resistor, the port of the drain electrode of the second field effect transistor, which is connected with the third resistor, is the grounding end of the reverser, the grid electrode of the second field effect transistor is connected with the other end of the third resistor, and the port of the grid electrode of the second field effect transistor, which is connected with the other end of the third resistor, is the input end of the reverser.
In one possible design, the output voltage detection circuit includes: the first gate voltage detection circuit, the fourth resistor and the fifth resistor;
the first input end of the first gate voltage detection circuit is the first input end of the output voltage detection circuit, the second input end of the first gate voltage detection circuit is the second input end of the output voltage detection circuit, the output end of the first gate voltage detection circuit is connected with one end of the fourth resistor, and the first gate voltage detection circuit is used for controlling the normal work of the LED;
the other end of the fourth resistor is connected with the first output unit and one end of the fifth resistor respectively, the other end of the fourth resistor is an output end of the output voltage detection circuit, and the other end of the fifth resistor is a grounding end of the output voltage detection circuit.
In one possible design, the first gate-gate voltage detection circuit includes: the first triode, the sixth resistor and the first voltage regulator tube;
the emitter of the first triode is the first input end of the first gate voltage detection circuit, the base of the first triode is connected with the negative electrode of the first voltage-regulator tube through the sixth resistor, and the collector of the first triode is the output end of the first gate voltage detection circuit;
and the anode of the first voltage-regulator tube is the second input end of the first gate grid voltage detection circuit.
In one possible design, the output voltage detection circuit further includes: a first filter circuit;
the first filter circuit is connected in parallel with the fifth resistor, and the first filter circuit is used for filtering an output signal of the output end of the output voltage detection circuit.
In one possible design, the apparatus further includes: a plurality of LED detection circuits, each of which is connected to one LED;
a first input end of each LED detection circuit in the plurality of LED detection circuits is connected with an anode of the corresponding LED, a second input end of each LED detection circuit is connected with a cathode of the corresponding LED, a grounding end of each LED detection circuit is connected with a second grounding end, an output end of each LED detection circuit is connected with a first output unit, and the voltage of the second input end of each LED detection circuit is greater than the rated voltage of the LED;
the first output unit is further used for indicating whether the LED corresponding to each LED detection circuit has a fault.
In one possible design, each of the LED detection circuits includes: the gate voltage detection circuit comprises a second gate voltage detection circuit, a seventh resistor, an eighth resistor and a first diode;
the first input end of the second gate voltage detection circuit is the first input end of the LED detection circuit, the second input end of the second gate voltage detection circuit is the second input end of the LED detection circuit, the output end of the second gate voltage detection circuit is connected with one end of the seventh resistor, and the second gate voltage detection circuit is used for controlling the LED detection circuit to be closed when the LED is normal;
the other end of the seventh resistor is connected with the anode of the first diode and one end of the eighth resistor respectively;
the cathode of the first diode is the output end of the LED detection circuit;
the other end of the eighth resistor is a grounding end of the LED detection circuit.
In one possible design, the second gate voltage detection circuit includes: the second triode, the ninth resistor and the second voltage-regulator tube;
an emitter of the second triode is a first input end of the second gate voltage detection circuit, a base of the second triode is connected with a negative electrode of the second voltage-regulator tube through the ninth resistor, and a collector of the second triode is an output end of the second gate voltage detection circuit;
and the anode of the second voltage-regulator tube is a second input end of the second gate voltage detection circuit.
In one possible design, the apparatus further includes: a third diode, an optocoupler, and a second output unit;
the negative electrode of the third diode is respectively connected with the live wire and the first end of the optical coupler, the positive electrode of the third diode is respectively connected with the zero wire and the second end of the optical coupler, and the third diode is used for converting alternating current into direct current;
the third end of the optical coupler is connected with a second power supply, the fourth end of the optical coupler is connected with the second output unit, and the optical coupler is used for converting the direct current into square waves;
the second power supply is used for supplying power to the optical coupler;
the second output unit is used for indicating whether a power supply fault exists in the power grid.
In one possible design, the apparatus further includes: the circuit protection unit, the first resistance-capacitance voltage reduction circuit, the second resistance-capacitance voltage reduction circuit, the third filter circuit and the tenth resistor;
one end of the first resistance-capacitance voltage reduction circuit is connected with the live wire through the circuit protection unit, the other end of the first resistance-capacitance voltage reduction circuit is connected with the negative electrode of the third diode, and the first resistance-capacitance voltage reduction circuit is used for limiting the current of the optical coupler;
one end of the second resistance-capacitance voltage reduction circuit is connected with the zero line, the other end of the second resistance-capacitance voltage reduction circuit is connected with the anode of the third diode, and the second resistance-capacitance voltage reduction circuit is used for limiting the current of the optical coupler;
one end of the third filter circuit is connected to one end of the tenth resistor and the second output unit, and the other end of the third filter circuit is connected to the second ground terminal, and the third filter circuit is configured to filter an output voltage signal of the optical coupler;
the other end of the tenth resistor is connected with the fourth end of the optical coupler, and the tenth resistor is used for limiting and dividing the output current of the optical coupler and adjusting the voltage of the second output unit.
In a second aspect, an embodiment of the present application provides a fault detection system for a luminaire control system, including: a micro control unit and a fault detection device as described in the first aspect;
the micro control unit is connected with the fault detection device and used for receiving signals output by the first output unit in the fault detection device.
In a third aspect, an embodiment of the present application provides a fault detection system for a luminaire control system, including: a micro control unit and a fault detection device as described in the first aspect;
the micro control unit is connected to the fault detection device, and the micro control unit is configured to receive the signal output by the first output unit and the signal output by the second output unit in the fault detection device according to the first aspect.
The fault detection device and the fault detection system of the lamp control system provided by the embodiment of the application are provided with an inverter, an output voltage detection circuit and a first output unit; the power supply end of the reverser is connected with a first power supply, the input end of the reverser is connected with a first grounding end, the grounding end of the reverser is connected with a second grounding end, the output end of the reverser is connected with the first output unit, the reverser is used for indicating whether the LED power supply control chip has faults or not, namely the first power supply supplies power to the LED power supply control chip and is connected with the reverser, and whether the LED power supply control chip has faults or not is detected through the reverser; the first input end of the output voltage detection circuit is connected with the positive electrode of the LED, the second input end of the output voltage detection circuit is connected with the negative electrode of the LED, the grounding end of the output voltage detection circuit is connected with the second grounding end, the output end of the output voltage detection circuit is connected with the first output unit, the output voltage detection circuit is used for indicating whether the LED power supply has faults or not when the LED power supply control chip is normal, wherein the output end of the LED power supply is connected with the LED, the LED power supply is used for supplying power to the LED, the voltage of the second input end of the output voltage detection circuit is smaller than the rated voltage of the LED so as to ensure that the voltage of the LED (namely the LED light source voltage) cannot cause the detection of the fault errors of the LED, namely, the LED is externally connected with the LED through the output voltage detection circuit when the LED power supply control chip is normal, and the rated voltage of the LED is preset to be larger than the voltage of the second input end of the output voltage detection circuit, so that misjudgment of the output result of the first output unit caused by abnormal LED can be eliminated, and whether the LED power supply has a fault or not can be accurately detected. This scheme is used for through the external power that is used for of reverser the power of LED power control chip power supply, the rethread output voltage detection circuitry is external LED with first output unit, and pass through LED with the output of LED power with first output unit connects, can detect out whether LED power control chip has the trouble and whether LED power has the trouble, realizes discovering LED's inefficacy problem fast, and then can in time report, restore fast, and improved the value of illumination product (lamps and lanterns, LED promptly) and the experience of lighting environment is felt.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a fault detection device of a lamp control system according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a fault detection device of a lamp control system according to another embodiment of the present application;
fig. 3 is a schematic structural diagram of a fault detection device of a lamp control system according to another embodiment of the present application;
fig. 4 is a schematic structural diagram of a fault detection device of a lamp control system according to still another embodiment of the present application;
fig. 5 is a schematic structural diagram of a fault detection device of a lamp control system according to yet another embodiment of the present application;
fig. 6 is a schematic structural diagram of a fault detection device of a lamp control system according to still another embodiment of the present application;
fig. 7 is a schematic structural diagram of a fault detection device of a lamp control system according to another embodiment of the present application;
fig. 8 is a schematic structural diagram of a fault detection device of a lamp control system according to yet another embodiment of the present application;
fig. 9 is a schematic structural diagram of a fault detection system of a lamp control system according to another embodiment of the present application;
fig. 10 is a schematic structural diagram of a fault detection system of a lamp control system according to still another embodiment of the present application.
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.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the above-described drawings (if any) are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of a fault detection device of a lamp control system according to an embodiment of the present application, as shown in fig. 1: the failure detection device includes: the inverter 10, the output voltage detection circuit 20, and the first output unit 30(OUT 1); a power supply end of the inverter 10 is connected to a first power supply 1(VCC1), an input end of the inverter 10 is connected to a first ground end, a ground end of the inverter 10 is connected to a second ground end, an output end of the inverter 10 is connected to the first output unit 30, and the inverter 10 is configured to detect whether a fault exists in the LED power control chip; a first input end of the output voltage detection circuit 20 is connected to a positive electrode of the LED, a second input end of the output voltage detection circuit 20 is connected to a negative electrode of the LED, a ground end of the output voltage detection circuit 20 is connected to the second ground end, an output end of the output voltage detection circuit 20 is connected to the first output unit 30, and the output voltage detection circuit 20 is configured to detect whether the LED power supply fails when the LED power supply control chip is normal; the first output unit 30 is used for indicating whether the LED power control chip has a fault or whether the LED power has a fault; wherein, first power 1(VCC1) is used for LED power control chip power supply, the output of LED power with LED connects, the LED power be used for the LED power supply, the voltage of output voltage detection circuitry 20's second input is less than LED's rated voltage.
In this embodiment, the inverter 10, the output voltage detection circuit 20, and the first output unit 30(OUT1) may be integrated on a PCB, and the inverter 10 may be configured with four pins, wherein a first pin of the inverter 10 (a power terminal of the inverter 10) is connected to a first power supply 1(VCC1), a second pin of the inverter 10 (an input terminal of the inverter 10) is connected to a first ground terminal 2(VSS), a third pin of the inverter 10 (a ground terminal of the inverter 10) is connected to a second ground terminal 3(SGND), and a fourth pin of the inverter 10 (an output terminal of the inverter 10) is connected to the first output unit 30, so as to indicate whether the LED power control chip has a fault through the first output unit 30. Specifically, when the inverter 10 detects whether the LED power control chip has a fault, if the signal (level) output by the first output unit 30 is close to 0, it may be considered as 0, that is, if the signal (level) output by the first output unit 30 is 0, at this time, the LED power control chip has a fault, and if the signal (level) output by the first output unit 30 is not 0, it indicates that the LED power control chip has no fault, and other fault problems are continuously detected.
The output voltage detection circuit 20 is configured to detect whether the LED power supply has a fault when the LED power supply control chip is normal. Specifically, since the LED power control chip can control the generation of an LED driving power (LED power), the output voltage detection circuit 20 needs to determine that the LED power control chip is normal in the process of detecting the LED power, and the inverter 10 is provided to improve the accuracy of detecting the LED power failure. Then, the LED is externally connected through the input end of the output voltage detection circuit 20 (the first input end of the output voltage detection circuit 20 and the second input end of the output voltage detection circuit 20), the LED is externally connected to the output end of the LED power supply, the output end of the output voltage detection circuit 20 is connected to the first output unit 30, whether the LED power supply has a fault or not can be indicated through the first output unit 30, when the level output by the first output unit 30 is a high level (0.35 v-0.6 v), it is indicated that the output end of the output voltage detection circuit 20 outputs normally, that is, the LED power supply has no fault; when the level output by the first output unit 30 is low (less than or equal to 0.25v), it indicates that the output of the output voltage detection circuit 20 is abnormal, i.e. the LED power supply is faulty.
Therefore, when the output voltage detection circuit 20 detects a power failure of an LED, the correctness of the result output from the output terminal of the output voltage detection circuit 20 due to the failure of the LED power control chip is eliminated by the inverter 10.
In the present embodiment, the inverter 10, the output voltage detection circuit 20, and the first output unit 30 are provided; the power supply end of the inverter 10 is connected to a first power supply 1(VCC1), the input end of the inverter 10 is connected to a first ground end, the ground end of the inverter 10 is connected to a second ground end, the output end of the inverter 10 is connected to the first output unit 30, the inverter 10 is configured to indicate whether the LED power control chip fails, that is, the first power supply 1(VCC1) supplies power to the LED power control chip and is connected to the inverter 10, and the inverter 10 detects whether the LED power control chip fails; then, by setting the first input end of the output voltage detection circuit 20 to be connected to the anode of the LED (anode of the light emitting diode), the second input end of the output voltage detection circuit 20 to be connected to the cathode of the LED (cathode of the light emitting diode), the ground end of the output voltage detection circuit 20 to be connected to the second ground end, the output end of the output voltage detection circuit 20 to be connected to the first output unit 30, the output voltage detection circuit 20 to indicate whether the LED power supply has a fault when the LED power supply control chip is normal, wherein the output end of the LED power supply is connected to the LED, the LED power supply is used to supply power to the LED, the voltage of the second input end of the output voltage detection circuit 20 is smaller than the rated voltage of the LED to ensure that the voltage of the LED (i.e. the LED light source voltage) does not cause the fault error of the LED detection, that is when the LED power supply control chip is normal, through output voltage detection circuit 20 is external LED, and predetermine LED's rated voltage is greater than the voltage of output voltage detection circuit 20's second input end, can get rid of because LED is unusual and lead to the misjudgement to first output unit 30 output result, and then can accurately detect whether there is the trouble in the LED power. This scheme is used for through reverser 10 external the power of LED power control chip power supply, the rethread output voltage detection circuitry 20 external LED with first output unit 30, and pass through LED with the output of LED power with first output unit 30 is connected, can detect out whether LED power control chip has the trouble and whether LED power has the trouble, realizes discovering LED's failure problem fast, and then can in time report, restore fast, and improved the value of illumination product (lamps and lanterns, LED promptly) and the experience of lighting environment is felt.
Fig. 2 is a schematic structural diagram according to another embodiment of the present application. The present embodiment describes the inverter 10 in detail based on the above-mentioned embodiments, for example, based on fig. 1, and as shown in fig. 2, the inverter 10 includes: the circuit comprises a first field effect transistor Q1, a second field effect transistor Q2, a first resistor R101, a second resistor R102 and a third resistor R103; the source of the first fet Q1 is connected to one end of the first resistor R101, the drain of the first fet Q1 is connected to the second ground terminal, the gate of the first fet Q1 is connected to one end of the second resistor R102 and the source of the second fet Q2, respectively, and the source of the first fet Q1 is the output terminal of the inverter 10; the other end of the first resistor R101 is connected to the other end of the second resistor R102, and a port at which the other end of the first resistor R101 is connected to the other end of the second resistor R102 is a power supply end of the inverter 10; the drain of the second fet Q2 is connected to one end of the third resistor R103, the port of the second fet Q2 connected to the third resistor R103 is the ground terminal of the inverter 10, the gate of the second fet Q2 is connected to the other end of the third resistor R103, and the port of the second fet Q2 connected to the other end of the third resistor R103 is the input terminal of the inverter 10.
In this embodiment, as shown in fig. 2, a first fet Q1, a second fet Q2, a first resistor R101, a second resistor R102, and a third resistor R103 form an inverter 10, wherein a port at which the other end of the first resistor R101 is connected to the other end of the second resistor R102 is a power supply terminal of the inverter 10, a port at which the gate of the second fet Q2 is connected to the other end of the third resistor R103 is an input terminal of the inverter 10, a source of the first fet Q1 is an output terminal of the inverter 10, and a port at which the drain of the second fet Q2 is connected to the third resistor R103 is a ground terminal of the inverter 10. Specifically, when detecting whether the LED power supply has a fault, there are two paths of the accessed circuits, where VSS and VCC1 are access points of the inverter 10 (VSS and VCC1 are input ends of the inverter 10, that is, VSS is accessed to the input end of the inverter 10, and VCC1 is accessed to the power supply end of the inverter 10), and these two access points can reflect whether the LED power supply control chip (power supply control IC) is normal. The access point in the other path is the two ends of the LED (the LED + and the LED-, namely the output end of the LED power supply), and the access point can reflect whether the LED power supply is normal or not when the LED power supply controls a chip.
Fig. 3 is a schematic structural diagram of a fault detection device of a lamp control system according to another embodiment of the present application. In the embodiment of the present application, the output voltage detection circuit 20 is described in detail based on the above-mentioned embodiments, for example, based on fig. 1, and as shown in fig. 3, the output voltage detection circuit 20 includes: a first gate voltage detection circuit 201, a fourth resistor R201, and a fifth resistor R202; the first input end of the first gate voltage detection circuit 201 is the first input end of the output voltage detection circuit 201, the second input end of the first gate voltage detection circuit 201 is the second input end of the output voltage detection circuit 20, the output end of the first gate voltage detection circuit 201 is connected with one end of the fourth resistor R201, and the first gate voltage detection circuit 201 is used for controlling the normal operation of the LED; the other end of the fourth resistor R201 is connected to one ends of the first output unit 30 and the fifth resistor R202, respectively, the other end of the fourth resistor R201 is an output end of the output voltage detection circuit 20, and the other end of the fifth resistor R202 is a ground end of the output voltage detection circuit 20.
In this embodiment, the first input terminal of the first gate voltage detection circuit 201 is connected to the positive electrode of the LED, the second input terminal of the first gate voltage detection circuit 201 is connected to the negative electrode of the LED, the ground terminal of the output voltage detection circuit 20 of the first gate voltage detection circuit 201 is connected to the second ground terminal, the output terminal of the first gate voltage detection circuit 201 is connected to one end of the fourth resistor R201, the other end of the fourth resistor R201 is connected to one end of the first output unit 30(OUT1) and one end of the fifth resistor R202, the other end of the fifth resistor R202 is connected to the second ground terminal, and the first gate voltage detection circuit 201 is configured to control the LED to normally operate.
Specifically, in the process of detecting whether the LED power source has a fault, two output ends of the first gate voltage detection circuit 201 (a first input end of the first gate voltage detection circuit 201 and a second input end of the first gate voltage detection circuit 201) are externally connected to the LED, two ends of the LED are externally connected to the output end of the LED power source, the first gate voltage detection circuit 201, the fourth resistor R201 and the fifth resistor R202 are sequentially connected in series, and the other end of the fourth resistor R201 is connected to the first output unit 30(OUT1) to detect the level of the current output by the fourth resistor R201, that is, the voltage at two ends of the fifth resistor R202 is output through the first output unit 30(OUT 1). The fourth resistor R201 and the fifth resistor R202 are used to limit the current flowing through the first gate voltage detection circuit 201, and adjust the voltage (level) output by the first output unit 30(OUT 1).
In a possible design, the embodiment of the present application provides a detailed description of the first gate-gate voltage detection circuit 201 in the output voltage detection circuit 20 on the basis of the above-mentioned embodiment, and as shown in fig. 3, the first gate-gate voltage detection circuit 201 includes: the circuit comprises a first triode Q2011, a sixth resistor R2011 and a first voltage regulator tube ZD 2011; an emitter of the first triode Q2011 is a first input end of the first gate-gate voltage detection circuit 201, a base of the first triode Q2011 is connected with a negative electrode of the first voltage regulator tube ZD2011 through the sixth resistor R2011, and a collector of the first triode Q2011 is an output end of the first gate-gate voltage detection circuit 201; the positive electrode of the first voltage regulator tube ZD2011 is a second input end of the first gate voltage detection circuit 201.
In this embodiment, an emitter of the first triode Q2011 is connected to an anode of the LED, a base of the first triode Q2011 is connected to a cathode of the first voltage regulator tube ZD2011 through the sixth resistor R2011, a collector of the first triode Q2011 is connected to one end of the fourth resistor R201, and the other end of the fourth resistor R201 is connected to the first output unit 30, so that a signal is output through the first output unit 30, that is, a working state of the LED power source is output from the OUT1 in a high-low level manner, and whether the LED power source normally works is indicated. Specifically, the voltage of the preset LED satisfies (Vzd701+0.7Vpn) < Vled, that is, the maximum operating voltage (rated voltage) of the LED (light source) is greater than (the voltage of the first voltage regulator tube ZD2011 plus the PN junction voltage of the first triode Q2011), and when the output is normal, the change of the light source voltage (LED voltage) Vled can cause the current flowing through the first triode Q2011 to change, and finally the current is output from OUT1 in the form of voltage (0.35V to 0.6V); OUT1 outputs a low level (less than and including 0.25V) when the LED fails.
Fig. 4 is a schematic structural diagram of a fault detection device of a lamp control system according to still another embodiment of the present application. The embodiment of the present application describes the output voltage detection circuit 20 in detail based on the above-mentioned embodiment, for example, based on the embodiment described in fig. 3. As shown in fig. 4, the output voltage detection circuit 20 further includes: a first filter circuit 40; the first filter circuit 40 is connected in parallel to the fifth resistor R202, and the first filter circuit 40 is configured to filter an output signal at an output end of the output voltage detection circuit 20.
In this embodiment, the first filter circuit 40 is a first RC filter circuit in which an eleventh resistor R401 and a first capacitor C401 are connected in parallel, wherein the fifth resistor R202 is connected in parallel with the first filter circuit 40, one end of the fifth resistor R202 connected in parallel with the first filter circuit 40 is set as one end of the fifth resistor R202, one end of the fifth resistor R202 connected in parallel with the first filter circuit 40 is connected to the first output unit 30(OUT1), the other end of the fifth resistor R202 connected in parallel with the first filter circuit 40 is set as the other end of the fifth resistor R202, and the other end of the fifth resistor R202 connected in parallel with the first filter circuit 40 is connected to the second ground terminal 3 (SGND). The output signal of the output end of the output voltage detection circuit 20 is filtered by the first RC filter circuit, so that the signal output by the first output unit 30 is more accurate, and whether the LED power supply has a fault or not is further effectively determined.
The working principle of the reverser 10 is as follows: when the LED power supply is operating normally, Q102 is on, Q101 is off, R101 and R401, R202 form a voltage divider, generating a high level on the first output unit 30(OUT 1). When the LED power supply operates abnormally, Q102 is turned off, Q101 is turned on, and a low level is generated in the first output unit 30(OUT 1).
Fig. 5 is a schematic structural diagram of a fault detection device of a lamp control system according to still another embodiment of the present application. The embodiments of the present application describe the fault detection apparatus in detail based on the above-described embodiments, for example, based on any one of the embodiments shown in fig. 1 to 4. Referring to fig. 5, the apparatus further comprises: a plurality of LED detection circuits 50, each of which is connected to one LED; a first input end of each of the LED detection circuits 50 is connected to an anode of the corresponding LED, a second input end of each of the LED detection circuits is connected to a cathode of the corresponding LED, a ground end of each of the LED detection circuits is connected to a second ground end, an output end of each of the LED detection circuits is connected to the first output unit 30, and a voltage of the second input end of each of the LED detection circuits is greater than a rated voltage of the LED; the first output unit 30 is further configured to indicate whether the LED corresponding to each of the LED detection circuits has a fault.
In this embodiment, as shown in fig. 5, the plurality of LED detection circuits 50 are formed by a plurality of same LED detection circuits to form an or gate, each of the plurality of LED detection circuits 50 is connected to one LED, that is, each of the plurality of LED detection circuits 50 is externally connected to one LED, and when any one or more of the plurality of LED detection circuits 50 correspondingly connected to the LED (LED light source) is open, R401 generates different high levels (0.8V-1.1V), which is shown on OUT 1. When detecting whether the LED is normal or not, in order to prevent false triggering, the maximum working voltage of the LED light source (the rated voltage of the LED) needs to satisfy (Vled < (Vzd5011+0.7Vpn)), namely the voltage of the second input end of each LED detection circuit is larger than the rated voltage of the LED, and when Vled > (Vzd5011+0.7Vpn), the LED detection circuit is triggered.
In a possible design, the embodiment of the present application provides a detailed description of each of the LED detection circuits on the basis of the above-mentioned embodiments. Referring to fig. 5, each of the LED detection circuits includes: the gate voltage detection circuit comprises a second gate voltage detection circuit, a seventh resistor, an eighth resistor and a first diode; the first input end of the second gate voltage detection circuit is the first input end of the LED detection circuit, the second input end of the second gate voltage detection circuit is the second input end of the LED detection circuit, the output end of the second gate voltage detection circuit is connected with one end of the seventh resistor, and the second gate voltage detection circuit is used for controlling the LED detection circuit to be closed when the LED is normal; the other end of the seventh resistor is connected with the anode of the first diode and one end of the eighth resistor respectively; the cathode of the first diode is the output end of the LED detection circuit; the other end of the eighth resistor is a grounding end of the LED detection circuit.
In this embodiment, in each of the LED detection circuits (the first LED detection circuits 501, …, the N-th LED detection circuit 50N), for example, the first LED detection circuit 501 is a circuit composed of a second gate voltage detection circuit 501, a seventh resistor R5013, an eighth resistor R5012, and a first diode D501, wherein a first input terminal of the second gate voltage detection circuit 501 is connected to a positive electrode of the LED, a second input terminal of the second gate voltage detection circuit 501 is connected to a negative electrode of the LED, an output terminal of the second gate voltage detection circuit 501 is connected to one end of the seventh resistor R5013, and the other end of the seventh resistor R5013 is connected to a positive electrode of the first diode D501 and one end of the eighth resistor R5012, respectively; the cathode of the first diode D501 is connected to the first output unit 30; the other end of the eighth resistor R5012 is connected to the second ground terminal. The second threshold voltage detection circuit (threshold voltage) is arranged to ensure that the LED light source open-circuit detection unit is not triggered by mistake when the light source works normally.
In a possible design, the embodiment of the present application describes the second gate voltage detection circuit 501 in detail on the basis of the above-mentioned embodiment. As shown in fig. 5, the second gate voltage detection circuit 501 includes: the second triode Q5011, a ninth resistor R5011 and a second voltage regulator tube ZD 5011; an emitter of the second triode Q5011 is a first input end of the second gate voltage detection circuit 501, a base of the second triode Q5011 is connected with a negative electrode of the second voltage regulator tube ZD5011 through the ninth resistor R5011, and a collector of the second triode Q5011 is an output end of the second gate voltage detection circuit 501; the positive electrode of the second zener diode ZD5011 is a second input end of the second gate voltage detection circuit 501.
In this embodiment, referring to fig. 5, for example, in the second gate voltage detection circuit 501, an emitter of the second transistor Q5011 is connected to a positive electrode of the LED, a base of the second transistor Q5011 is connected to a negative electrode of the second voltage regulator ZD5011 through the ninth resistor R5011, a collector of the second transistor Q5011 is connected to the other end of the eighth resistor R5012, and a positive electrode of the second voltage regulator ZD5011 is connected to a negative electrode of the LED. The P-type transistors Q5011 and ZD5011 constitute a threshold voltage detection circuit, and when the LED light source (LED) is turned on, the P-type transistors are turned on, generating a high level at R401. The magnitude of the threshold voltage can be adjusted by the value of the zener diode ZD 5011. Only when the LED light source is open-circuited, the maximum operating voltage (rated voltage of the LED) of the LED light source is greater than the voltage of the zener diode ZD5011 plus the PN junction voltage of the transistor Q5011, i.e., Vled > (Vzd702+0.7Vpn), and the light source open-circuit detection unit is triggered. To prevent false triggering, the maximum operating voltage of the light source is satisfied (Vled < (Vzd702+0.7 Vpn)).
Specifically, for example, a set of output voltage detection circuits 20 composed of Q5011, R5011, ZD5011, R5012, R5013 outputs the operating state of the LED power supply from OUT1 in the form of high and low levels. That is, when detecting whether the LED power supply is normal, and when the voltage of the LED (i.e., the LED light source voltage) is preset to satisfy { (Vzd201+0.7Vpn) < Vled < (Vzd501+0.7Vpn) }, under the normal condition of the LED power supply, the current flowing through Q2011 is changed due to the change of the LED light source voltage Vled, and is finally output from OUT1 in the form of voltage (0.35V to 0.6V); when the LED power fails, OUT1 outputs a low level (0.25V or less). When the LED (LED light source) connected to any one or more of the LED detection circuits 50 is open, R401 generates a different high level (0.8V-1.1V), which is indicated at OUT 1. Therefore, as shown in fig. 5, the first output unit 30 may be integrated with the inverter 10, the output voltage detection circuit 20, and the plurality of LED detection circuits 50 on one PCB, and a signal output by the first output unit 30 indicates whether the LED power control chip has a fault, whether the LED power has a fault, or whether the LED corresponding to each of the LED detection circuits has a fault, so as to quickly find the failure problem of the LED, timely notify and quickly repair the failure problem, and improve the value of the lighting product (lamp) and the experience of the lighting environment.
Fig. 6 is a schematic structural diagram of a fault detection device of a lamp control system according to still another embodiment of the present application. The embodiment of the present application describes the fault detection apparatus in detail based on the above-described embodiment, for example, based on the embodiment described in fig. 5. Referring to fig. 6, the apparatus further comprises: a third diode D601, a photo coupler PC1, and a second output unit 601(OUT 2); the cathode of the third diode D601 is connected to the live wire and the first end of the optical coupler PC1, respectively, the anode of the third diode D601 is connected to the neutral wire and the second end of the optical coupler PC1, respectively, and the third diode D601 is used for converting alternating current into direct current; a third terminal of the optocoupler PC1 is connected with a second power supply 4(VCC2), a fourth terminal of the optocoupler PC1 is connected with the second output unit 601, and the optocoupler PC1 is used for converting the direct current into a square wave; the second power supply 4(VCC2) is used to power the optocoupler PC 1; the second output unit 601 is used for indicating whether a power supply fault exists in the power grid.
In this embodiment, the optocoupler PC1 includes a light emitting diode and a transistor (i.e., a fourth diode D602 and a third transistor Q601), wherein a cathode of the third diode D601 is connected to the live line L and the first end (anode of the fourth diode) of the optocoupler PC1, respectively, an anode of the third diode D601 is connected to the neutral line N and the second end (cathode of the fourth diode D602) of the optocoupler PC1, respectively, and the third diode D601 is configured to convert ac power into dc power; a third terminal (an emitter of the third transistor Q601) of the optocoupler PC1 is connected to the second power supply 4(VCC2), a fourth terminal (a collector of the third transistor Q601) of the optocoupler PC1 is connected to the second output unit 601(OUT2), and the optocoupler PC1 is configured to convert the direct current into a square wave; the second power supply 4(VCC2) is used to power the optocoupler PC 1; the second output unit 601(OUT2) is used for indicating whether a power supply fault exists in the power grid.
Fig. 7 is a schematic structural diagram of a fault detection device of a lamp control system according to another embodiment of the present application. The embodiment of the present application describes the fault detection apparatus in detail based on the above-described embodiment, for example, based on the embodiment described in fig. 6. Referring to fig. 7, the apparatus further comprises: the circuit protection circuit comprises a circuit protection unit 605, a first resistance-capacitance voltage reduction circuit 602, a second resistance-capacitance voltage reduction circuit 603, a third filter circuit 604 and a tenth resistor R601; one end of the first rc step-down circuit 602 is connected to the live line through the circuit protection unit 605, the other end of the first rc step-down circuit 602 is connected to the cathode of the third diode D601, and the first rc step-down circuit 602 is configured to limit current to the optocoupler PC 1; one end of the second resistance-capacitance voltage reduction circuit 603 is connected with the zero line, the other end of the second resistance-capacitance voltage reduction circuit 603 is connected with the anode of the third diode D601, and the second resistance-capacitance voltage reduction circuit 603 is used for limiting the current of the optical coupler PC 1; one end of the third filter circuit 604 is connected to one end of the tenth resistor R601 and the second output unit 601, respectively, the other end of the third filter circuit 604 is connected to the second ground terminal, and the third filter circuit 604 is configured to filter the output voltage signal of the optocoupler PC 1; the other end of the tenth resistor R601 is connected to the fourth end of the photo coupler PC1, and the tenth resistor R601 is used for limiting and dividing the output current of the photo coupler PC1, and adjusting the voltage of the second output unit 601.
In this embodiment, the first rc step-down circuit 602 and the second rc step-down circuit 603 are both connected in series by two resistors and a capacitor connected in series, one end of the first rc step-down circuit 602 (one end of a capacitor C6021 in the first rc step-down circuit 602) is connected to the live line through the circuit protection unit 605, and the other end of the first rc step-down circuit 602 (the other end of a resistor R6022 in the first rc step-down circuit 602) is connected to the negative electrode of the third diode D601. One end of the second rc step-down circuit 603 (the end of the capacitor C6031 in the second rc step-down circuit 603) is connected to the zero line, and the other end of the second rc step-down circuit 603 (the other end of the resistor R6032 in the second rc step-down circuit 603) is connected to the anode of the third diode D601. The third filter circuit 604 is formed by connecting two capacitors connected in parallel and a resistor in parallel, one end of the third filter circuit 604 (the end of the third filter circuit 604 after the resistor R6041, the capacitor C6041 and the capacitor C6042 are connected in parallel) is connected with one end of the tenth resistor R601 and the second output unit 601 respectively, and the other end of the third filter circuit 604 is connected with the other end of the third filter circuit 604 after the resistor R6041, the capacitor C6041 and the capacitor C6042 are connected in parallel) and the second ground terminal. The other end of the tenth resistor R601 is connected to a fourth terminal of the optocoupler PC1 (a collector of the transistor in the optocoupler PC1, i.e., a collector of the third transistor Q601), and the tenth resistor R601 is used for limiting and dividing the output current of the optocoupler PC1 and adjusting the voltage of the second output unit 601.
Specifically, the alternating current of 220VAC/50HZ is converted into a square wave with a duty ratio of 50% by the photo coupler PC1, and a signal is output through the second output unit 601(OUT 2). Under the normal condition of the ac power supply of the power grid, OUT2 outputs a square wave with amplitude of 3V, duty ratio of 50% and frequency of 50 Hz. In the case of an ac power supply abnormality, OUT2 outputs a low level close to 0V.
Fig. 8 is a schematic structural diagram of a fault detection device of a lamp control system according to still another embodiment of the present application. The embodiments of the present application describe the fault detection apparatus in detail on the basis of the above embodiments. In practical applications, referring to fig. 8, fig. 8 is a circuit diagram of the above-mentioned fig. 5 and fig. 7 integrated on one PCB, and specifically, whether there is a fault in the LED power control chip, whether there is a fault in the LED power, and whether there is a fault in the LED corresponding to each of the LED detection circuits can be detected through the circuit diagram shown in fig. 8. Wherein, a group of output voltage detection circuits composed of Q5011, R5011, ZD5011, R5012 and R5013 outputs the operating state of the LED power supply from OUT1 in the form of high and low levels. That is, when detecting whether the LED power supply is normal, and when the voltage of the LED (i.e., the LED light source voltage) is preset to satisfy { (Vzd201+0.7Vpn) < Vled < (Vzd501+0.7Vpn) }, under the normal condition of the LED power supply, the current flowing through Q2011 is changed due to the change of the LED light source voltage Vled, and is finally output from OUT1 in the form of voltage (0.35V to 0.6V); when the LED power fails, OUT1 outputs a low level (0.25V or less). When the LED (LED light source) connected to any one or more of the LED detection circuits 50 is open, R401 generates a different high level (0.8V-1.1V), which is indicated at OUT 1. Therefore, as shown in fig. 5, the first output unit 30 may be integrated with the inverter 10, the output voltage detection circuit 20, and the plurality of LED detection circuits 50 on one PCB, and a signal output by the first output unit 30 indicates one of whether the LED power control chip has a fault, whether the LED power has a fault, and whether the LED corresponding to each of the LED detection circuits has a fault. The 220VAC/50HZ AC power is converted into a 50% square wave by the optical coupler PC1, and a signal is output through the second output unit 601(OUT 2). Under the normal condition of the ac power supply of the power grid, OUT2 outputs a square wave with amplitude of 3V, duty ratio of 50% and frequency of 50 Hz. In the case of an ac power supply abnormality, OUT2 outputs a low level close to 0V. The failure problem of the LED can be found quickly, so that the failure problem can be reported and repaired timely and quickly, and the value of an illuminating product (lamp) and the experience of an illuminating environment are improved.
Fig. 9 is a schematic structural diagram of a fault detection system of a lamp control system according to another embodiment of the present application. The embodiment of the present application describes the system in detail on the basis of the above embodiment. The system comprises: a micro control unit and a fault detection device as described above in the embodiments corresponding to any of figures 1-5; the micro control unit is connected to the fault detection device, and the micro control unit is configured to receive a signal output by the first output unit 30 in the fault detection device.
The embodiment of the fault detection device in the fault detection system of the lamp control system is similar to that of any one of the fault detection devices in the embodiments corresponding to fig. 1 to 5, and is not described herein again.
In the embodiment of the present application, any of the fault detection devices described in the embodiments corresponding to fig. 1 to 5 is referred to as a first fault detection device 902, a first output unit 30 of the first fault detection device 902 is connected to the micro control unit 901, a signal output by the first output unit 30 in the first fault detection device 902 is transmitted to the micro control unit 901, and the micro control unit processes a signal output by the first output unit 30, so that a fault problem is timely handled, and a user experience is improved.
Fig. 10 is a schematic structural diagram of a fault detection system of a lamp control system according to still another embodiment of the present application. The embodiment of the present application describes the system in detail on the basis of the above embodiment. The system comprises: a micro-control unit and a fault detection device as described above in the embodiments corresponding to any of figures 6-8; the micro control unit is connected to the fault detection device, and the micro control unit is configured to receive a signal output by the first output unit 30 in the fault detection device.
The embodiment of the fault detection device in the fault detection system of the lamp control system is similar to that of any one of the fault detection devices in the embodiments corresponding to fig. 6 to 8, and is not described herein again.
In the embodiment of the present application, any of the fault detection devices described in the embodiments corresponding to fig. 6 to 8 is referred to as a second fault detection device 903, a first output unit 30 or a second output unit 601 of the second fault detection device 903 is respectively connected to the micro control unit 901, a signal output by the first output unit 30 in the second fault detection device 902 is transmitted to the micro control unit 901, and the micro control unit processes a signal output by the first output unit 30 and/or a signal output by the second output unit 601, so as to process a fault problem in time and improve user experience.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (12)
1. A fault detection device for a lamp control system, comprising: an inverter, an output voltage detection circuit, and a first output unit;
the power supply end of the reverser is connected with a first power supply, the input end of the reverser is connected with a first grounding end, the grounding end of the reverser is connected with a second grounding end, the output end of the reverser is connected with the first output unit, and the reverser is used for detecting whether the LED power supply control chip has faults or not;
the first input end of the output voltage detection circuit is connected with the anode of the LED, the second input end of the output voltage detection circuit is connected with the cathode of the LED, the grounding end of the output voltage detection circuit is connected with the second grounding end, the output end of the output voltage detection circuit is connected with the first output unit, and the output voltage detection circuit is used for detecting whether the LED power supply has a fault when the LED power supply control chip is normal;
the first output unit is used for indicating whether the LED power supply control chip has a fault or not or whether the LED power supply has a fault or not;
the first power supply is used for supplying power to the LED power supply control chip, the output end of the LED power supply is connected with the LED, the LED power supply is used for supplying power to the LED, and the voltage of the second input end of the output voltage detection circuit is smaller than the rated voltage of the LED.
2. The apparatus of claim 1, wherein the inverter comprises: the circuit comprises a first field effect transistor, a second field effect transistor, a first resistor, a second resistor and a third resistor;
a source electrode of the first field effect transistor is connected with one end of the first resistor, a drain electrode of the first field effect transistor is connected with the second grounding end, a grid electrode of the first field effect transistor is respectively connected with one end of the second resistor and a source electrode of the second field effect transistor, and the source electrode of the first field effect transistor is an output end of the inverter;
the other end of the first resistor is connected with the other end of the second resistor, and a port formed by connecting the other end of the first resistor with the other end of the second resistor is a power supply end of the reverser;
the drain electrode of the second field effect transistor is connected with one end of the third resistor, the port of the drain electrode of the second field effect transistor, which is connected with the third resistor, is the grounding end of the reverser, the grid electrode of the second field effect transistor is connected with the other end of the third resistor, and the port of the grid electrode of the second field effect transistor, which is connected with the other end of the third resistor, is the input end of the reverser.
3. The apparatus of claim 1, wherein the output voltage detection circuit comprises: the first gate voltage detection circuit, the fourth resistor and the fifth resistor;
the first input end of the first gate voltage detection circuit is the first input end of the output voltage detection circuit, the second input end of the first gate voltage detection circuit is the second input end of the output voltage detection circuit, the output end of the first gate voltage detection circuit is connected with one end of the fourth resistor, and the first gate voltage detection circuit is used for controlling the normal work of the LED;
the other end of the fourth resistor is connected with the first output unit and one end of the fifth resistor respectively, the other end of the fourth resistor is an output end of the output voltage detection circuit, and the other end of the fifth resistor is a grounding end of the output voltage detection circuit.
4. The apparatus of claim 3, wherein the first gate voltage detection circuit comprises: the first triode, the sixth resistor and the first voltage regulator tube;
the emitter of the first triode is the first input end of the first gate voltage detection circuit, the base of the first triode is connected with the negative electrode of the first voltage-regulator tube through the sixth resistor, and the collector of the first triode is the output end of the first gate voltage detection circuit;
and the anode of the first voltage-regulator tube is the second input end of the first gate grid voltage detection circuit.
5. The apparatus of claim 3, wherein the output voltage detection circuit further comprises: a first filter circuit;
the first filter circuit is connected in parallel with the fifth resistor, and the first filter circuit is used for filtering an output signal of the output end of the output voltage detection circuit.
6. The apparatus of any of claims 1-5, further comprising: a plurality of LED detection circuits, each of which is connected to one LED;
a first input end of each LED detection circuit in the plurality of LED detection circuits is connected with an anode of the corresponding LED, a second input end of each LED detection circuit is connected with a cathode of the corresponding LED, a grounding end of each LED detection circuit is connected with a second grounding end, an output end of each LED detection circuit is connected with a first output unit, and the voltage of the second input end of each LED detection circuit is greater than the rated voltage of the LED;
the first output unit is further used for indicating whether the LED corresponding to each LED detection circuit has a fault.
7. The apparatus of claim 6, wherein each of the LED detection circuits comprises: the gate voltage detection circuit comprises a second gate voltage detection circuit, a seventh resistor, an eighth resistor and a first diode;
the first input end of the second gate voltage detection circuit is the first input end of the LED detection circuit, the second input end of the second gate voltage detection circuit is the second input end of the LED detection circuit, the output end of the second gate voltage detection circuit is connected with one end of the seventh resistor, and the second gate voltage detection circuit is used for controlling the LED detection circuit to be closed when the LED is normal;
the other end of the seventh resistor is connected with the anode of the first diode and one end of the eighth resistor respectively;
the cathode of the first diode is the output end of the LED detection circuit;
the other end of the eighth resistor is a grounding end of the LED detection circuit.
8. The apparatus of claim 7, wherein the second gate voltage detection circuit comprises: the second triode, the ninth resistor and the second voltage-regulator tube;
an emitter of the second triode is a first input end of the second gate voltage detection circuit, a base of the second triode is connected with a negative electrode of the second voltage-regulator tube through the ninth resistor, and a collector of the second triode is an output end of the second gate voltage detection circuit;
and the anode of the second voltage-regulator tube is a second input end of the second gate voltage detection circuit.
9. The apparatus of claim 8, further comprising: a third diode, an optocoupler, and a second output unit;
the negative electrode of the third diode is respectively connected with the live wire and the first end of the optical coupler, the positive electrode of the third diode is respectively connected with the zero wire and the second end of the optical coupler, and the third diode is used for converting alternating current into direct current;
the third end of the optical coupler is connected with a second power supply, the fourth end of the optical coupler is connected with the second output unit, and the optical coupler is used for converting the direct current into square waves;
the second power supply is used for supplying power to the optical coupler;
the second output unit is used for indicating whether a power supply fault exists in the power grid.
10. The apparatus of claim 9, further comprising: the circuit protection unit, the first resistance-capacitance voltage reduction circuit, the second resistance-capacitance voltage reduction circuit, the third filter circuit and the tenth resistor;
one end of the first resistance-capacitance voltage reduction circuit is connected with the live wire through the circuit protection unit, the other end of the first resistance-capacitance voltage reduction circuit is connected with the negative electrode of the third diode, and the first resistance-capacitance voltage reduction circuit is used for limiting the current of the optical coupler;
one end of the second resistance-capacitance voltage reduction circuit is connected with the zero line, the other end of the second resistance-capacitance voltage reduction circuit is connected with the anode of the third diode, and the second resistance-capacitance voltage reduction circuit is used for limiting the current of the optical coupler;
one end of the third filter circuit is connected to one end of the tenth resistor and the second output unit, and the other end of the third filter circuit is connected to the second ground terminal, and the third filter circuit is configured to filter an output voltage signal of the optical coupler;
the other end of the tenth resistor is connected with the fourth end of the optical coupler, and the tenth resistor is used for limiting and dividing the output current of the optical coupler and adjusting the voltage of the second output unit.
11. A fault detection system for a light fixture control system, the system comprising:
a micro control unit and a fault detection device according to any one of claims 1-8;
the micro control unit is connected with the fault detection device and used for receiving signals output by the first output unit in the fault detection device.
12. A fault detection system for a light fixture control system, the system comprising:
a micro control unit and a fault detection device according to claim 9 or 10;
the micro control unit is connected to the fault detection device, and is configured to receive the signal output by the first output unit and the signal output by the second output unit in the fault detection device according to claim 9 or 10.
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