Fire-fighting emergency lamp driving circuit system with fault type detection function

Abstract

The utility model provides a fire-fighting emergency lamp drive circuit system with fault type detection, which belongs to the technical field of electronic circuits and comprises an MCU power supply circuit, an MCU circuit, an AC detection circuit, a light source drive circuit, a relay control circuit, a light source circuit, a short-circuit protection circuit and a state detection circuit. The AC detection circuit isolates signals and transmits the signals to the MCU circuit, the MCU circuit controls and cuts off mains supply of a rear light source driving circuit through the relay control circuit, the light source circuit is electrically connected with the state detection circuit, and the state detection circuit and the short-circuit protection circuit achieve light source fault recognition through signal detection. And then the fault signal is transmitted to the MCU circuit. The utility model aims to solve the problem that the risk that a post-stage circuit is damaged and the fault range is expanded due to continuous input of commercial power when the fault type of a light source fault and a lamp light source fault cannot be clearly distinguished.

Description

Technical Field

[0001] The utility model belongs to the technical field of electronic circuits, and particularly relates to a driving circuit system for a fire emergency lighting fixture with fault type detection. Background Art

[0002] With the rapid development of the national economy, high-rise buildings are everywhere in the city, and the building structure styles are diverse. When a fire accident occurs, it is a necessary requirement of the country for high-rise buildings that people can be safely evacuated as soon as possible, and various fire emergency lighting and evacuation indication systems have also been more and more widely used with the introduction of national policies.

[0003] At present, small-power fire emergency lighting fixtures are usually installed in buildings with a net clear height of less than 8m to meet the requirements of fire acceptance. However, in application scenarios with a height of more than 8m, high-power fire emergency lighting fixtures are often required to meet the requirements. At this time, the fault detection and protection of the lamp source are particularly important. At present, many emergency lamps adopt a split configuration of a driving power supply plus a control box, with a relatively high overall cost, and only the feedback of faults can be realized, while the fault protection inside the lamp cannot be realized. In this way, when the lamp power is large, especially when the light source is short-circuited, the driving power supply still works continuously. If the faulty lamp cannot be processed in time, it is very easy to cause the expansion of power supply or control system faults, reduce safety, increase the system maintenance cost, and there is an urgent need in the market for a fire emergency lighting fixture driving circuit system that can prompt the presence or absence of faults, confirm the specific fault type, facilitate the application and maintenance of the system, and at the same time feedback fault information when the light source of the lamp fails to achieve driving protection. Content of the Utility Model

[0004] The purpose of the utility model is to provide a driving circuit system for a fire emergency lighting fixture with fault type detection. The utility model aims to solve the problems of existing fire emergency lighting fixtures. Although some products have a fault detection function, they can often only prompt the presence or absence of faults, cannot confirm the specific fault type, are not convenient for the application and maintenance of the system, and at the same time, when the light source of the lamp fails, they cannot feedback fault information, cannot achieve driving protection, are easy to cause the expansion of faults, further increase the maintenance cost or lose the maintenance value.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A driving circuit system for fire emergency lighting fixtures with fault type detection is used to detect the fault state and fault type of the light source of the lighting fixture in real time. It includes an MCU power supply circuit, an MCU circuit, an AC detection circuit, a light source driving circuit, a relay control circuit, a light source circuit, a short-circuit protection circuit, and a state detection circuit. The AC detection circuit transmits the signal to the MCU circuit after isolation. The MCU circuit controls the cut-off of the mains power supply of the rear light source driving circuit through the relay control circuit. The light source driving circuit provides electrical energy for the light source circuit. The light source circuit is electrically connected to the state detection circuit. The state detection circuit and the short-circuit protection circuit identify the light source fault through signal detection and then transmit the fault signal to the MCU circuit. The state detection circuit is also electrically connected to the short-circuit protection circuit.

[0007] As a preferred solution of the present utility model, the AC detection circuit is composed of a diode D7, a resistor R19, a resistor R20, a resistor R25, an optocoupler ISO2, a resistor R21, and a resistor R24. The diode D7 is sequentially connected in series with the resistor R19 and the resistor R20 and then electrically connected to the positive electrode of the light-emitting diode in the optocoupler ISO2. One end of the resistor R25 is connected to the power ground PGND, and the other end of the resistor R25 is electrically connected to the connection end of the resistor R20 and the light-emitting diode in the optocoupler ISO2.

[0008] As a preferred solution of the present utility model, the resistor R25 is connected in parallel with the light-emitting diode in the optocoupler ISO2. One end of the phototransistor in the optocoupler ISO2 is grounded GND, and the other end of the phototransistor in the optocoupler ISO2 is connected to the 5V power supply through the resistor R21. The resistor R21 is also electrically connected to the resistor R24.

[0009] As a preferred solution of the present utility model, the relay control circuit includes a resistor R54, a relay JDQ1, a capacitor E4, a capacitor E9, a diode VD16, a transistor N5, a resistor R39, a capacitor C32, and a resistor R55. The resistor R54 and the capacitor E4 are connected in parallel. The diode VD16 is connected in parallel with the relay JDQ1. The parallel connection end of the diode VD16 and the relay JDQ1 is electrically connected to the collector of the transistor N5. The emitter of the transistor N5 is grounded GND. The base of the transistor N5 is also electrically connected to the resistor R39, the capacitor C32, and the resistor R55 respectively. The resistor R39 and the capacitor C32 are connected in parallel. The other end of the resistor R55 is electrically connected to the CT1 terminal.

[0010] As a preferred solution of the present utility model, the short-circuit protection circuit and the state detection circuit form a safety protection circuit. The safety protection circuit is composed of several resistors, several capacitors, several transistors, several diodes, and an optocoupler.

[0011] As a preferred embodiment of the present utility model, when an open - circuit fault occurs in the light source, the light - source drive circuit operates in an open - circuit protection state, and the output is in an intermittent mode. After the safety protection circuit is powered on, the voltage across both ends of resistor R17 reaches the turn - on condition of the optocoupler through voltage division by resistor R10, resistor R58, resistor R59, resistor R8, and resistor R69, causing the optocoupler isolation terminal to output a low - level signal. The intermittent signal in the open - circuit state of the light - source drive circuit is limited in current by resistor R66, and then passes through diode VD5 and resistor R7 to the gate of transistor M2, enabling transistor M2 to conduct and short - circuit resistor R8, resistor R69, and resistor R17, causing the optocoupler to lose power and turn off. The optocoupler isolation terminal outputs a high - level signal, thereby ensuring that the optocoupler is consistent with the light - source drive circuit and enters the intermittent mode, outputting high - and low - level pulse signals.

[0012] As a preferred embodiment of the present utility model, when a short - circuit fault occurs in the light source, capacitor C3, diode VD3, resistor R10, resistor R58, and resistor R59 of the safety protection circuit are short - circuited. After transistor N2 conducts, it pulls down the gate level of transistor M2, forcing transistor M2 to turn off. The short - circuit protection circuit realizes hard clamping through a hardware circuit and directly cuts off the main drive output circuit.

[0013] Compared with the prior art, the beneficial effects of the present utility model are:

[0014] By designing a fire emergency lighting fixture drive circuit system with fault - type detection, it can detect open - circuit and short - circuit faults of lighting fixtures and light sources in real - time, and can achieve hard short - circuit protection, greatly extending the service life of the driver, facilitating system operation and maintenance, and having the characteristics of small volume, easy circuit implementation, and wide application range. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model and do not constitute a limitation to the present utility model. In the drawings:

[0016] Figure 1 is the overall circuit architecture diagram of a fire emergency lighting fixture drive circuit system with fault - type detection according to the present utility model;

[0017] Figure 2 is the fault - detection and protection - processing flowchart of a fire emergency lighting fixture drive circuit system with fault - type detection according to the present utility model;

[0018] Figure 3 is the AC fault - signal detection circuit diagram of a fire emergency lighting fixture drive circuit system with fault - type detection according to the present utility model;

[0019] Figure 4This is the relay control circuit diagram of a fire emergency lighting fixture drive circuit system with fault type detection according to the present utility model;

[0020] Figure 5 This is the safety protection circuit diagram of a fire emergency lighting fixture drive circuit system with fault type detection according to the present utility model. Specific embodiments

[0021] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0022] Embodiment

[0023] Please refer to Figures 1-5 , the present utility model provides the following technical solutions:

[0024] A fire emergency lighting fixture drive circuit system with fault type detection is used to detect the fault state and fault type of the light source of the lighting fixture in real time. It includes an MCU power supply circuit, an MCU circuit, an AC detection circuit, a light source drive circuit, a relay control circuit, a light source circuit, a short-circuit protection circuit, and a state detection circuit; the AC detection circuit transmits the signal to the MCU circuit after isolation, and the MCU circuit controls the cut-off of the mains power supply of the rear light source drive circuit through the relay control circuit. After a disconnection fault, the system reports the disconnection fault and waits for the system to recover and the fault to be eliminated before entering the normal working state. The light source drive circuit provides electrical energy for the light source circuit, and the light source circuit is electrically connected to the state detection circuit. The state detection circuit and the short-circuit protection circuit identify the light source fault through signal detection and then transmit the fault signal to the MCU circuit. The state detection circuit is also electrically connected to the short-circuit protection circuit. When the detected AC signal is normal, the system judges whether there is a lighting fixture start signal. After the lighting fixture starts, the light source drive circuit supplies power and the state detection circuit works to continuously detect the fault state. When a fault occurs, the corresponding state detection circuit acts to output a fault signal to the MCU circuit, and the MCU circuit controls the relay control circuit to cut off the AC power supply to protect the system and prevent the fault from expanding. At the same time, it waits for the system to recover and the fault to be eliminated before entering the normal working state.

[0025] Specifically, the AC detection circuit consists of diode D7, resistor R19, resistor R20, resistor R25, optocoupler ISO2, resistor R21, and resistor R24. Diode D7 is serially connected to resistor R19 and resistor R20 in sequence and then electrically connected to the positive electrode of the light-emitting diode in optocoupler ISO2. One end of resistor R25 is connected to the power ground PGND, and the other end of resistor R25 is electrically connected to the connection terminal between resistor R20 and the light-emitting diode in optocoupler ISO2; resistor R25 is in parallel with the light-emitting diode in optocoupler ISO2. One end of the photosensitive triode in optocoupler ISO2 is grounded to GND, and the other end of the photosensitive triode in optocoupler ISO2 is connected to the 5V power supply through resistor R21. Resistor R21 is also electrically connected to resistor R24. Its AC power detection circuit is as shown in Figure 3 the attached figure, aiming to detect the on / off fault of the power supply line through the error detection of the AC signal. After half-wave rectification by diode D7, this part of the circuit drives the optocoupler to conduct and cut off with the fluctuating signal of the AC through the voltage reduction of resistor R19 and resistor R20, and further isolates and transmits the signal to the MCU circuit to perform subsequent operations.

[0026] The relay control circuit includes resistor R54, relay JDQ1, capacitor E4, capacitor E9, diode VD16, transistor N5, resistor R39, capacitor C32, and resistor R55. Resistor R54 and capacitor E4 are in parallel. Diode VD16 is in parallel with relay JDQ1. The parallel terminal of diode VD16 and relay JDQ1 is electrically connected to the collector of transistor N5. The emitter of transistor N5 is grounded to GND. The base of transistor N5 is also electrically connected to resistor R39, capacitor C32, and resistor R55 respectively. Resistor R39 and capacitor C32 are in parallel. The other end of resistor R55 is electrically connected to the CT1 terminal. The short-circuit protection circuit and the status detection circuit form a safety protection circuit. The safety protection circuit consists of several resistors, several capacitors, several transistors, several diodes, and optocouplers. The relay control circuit is as shown in Figure 4 the attached figure, aiming to cut off the mains power supply of the rear light source drive circuit part through the drive of the low-voltage side coil, avoiding the situation that the light source drive circuit still works when there is a light source fault, and further expanding the potential safety hazard of damage. The control signal is driven and current-limited through resistor R55 to drive transistor N5 to conduct. Capacitor E9 provides the energy for the instantaneous start of relay JDQ1. Diode VD16 provides reverse voltage absorption for relay JDQ1 to protect the reliable operation of transistor N5. At the same time, through the double-path cut-off, the connection between the mains and the rear-end circuit is completely eliminated, and the secondary accident caused by the wrong phase sequence of the zero and live wires and the ghost fire situation of the rear-end light source leakage current are eliminated.

[0027] In specific applications, when an open-circuit fault occurs in the light source, the light source drive circuit operates in an open-circuit protection state, and the output is in an intermittent mode. At this time, since the load is disconnected, the open-circuit output voltage rises to the overvoltage protection limit value. The status detection circuit is powered on. After being divided by resistors R10, R58, R59, R8, and R69, the voltage at the R17 end of the resistor reaches the condition for turning on the optocoupler, and the optocoupler isolation end outputs a low-level signal. At the same time, the intermittent signal in the open-circuit state of the light source drive circuit is limited by resistor R66, and then passes through diode VD5 and resistor R7 to the gate of transistor M2, enabling transistor M2 to conduct, shorting resistors R8, R69, and R17, causing the optocoupler to lose power and turn off, and the optocoupler isolation end outputs a high-level signal. Furthermore, the optocoupler is consistent with the light source drive circuit and enters the intermittent mode, outputting high and low level pulse signals. After isolation, the pulse signals are transmitted to the MCU circuit for identification. When a short-circuit fault occurs in the light source, capacitors C3, diode VD3, resistors R10, R58, and R59 are short-circuited, and the LD1- and LD1+ points are at the same potential. The high potential of the drive output then drives transistor N2 to conduct through resistors R15 and R19. After transistor N2 conducts, it pulls down the gate level of transistor M2, and transistor M2 is forced to turn off. If the short-circuit fault persists, the high level at LD1- continues, and after being limited by resistors R15 and R19, it drives transistor N2 to maintain the off state of transistor M2. The short-circuit protection circuit realizes hard clamping through the hardware circuit and directly cuts off the main drive output circuit. At the same time, the status detection circuit rises. After being divided by resistors R8, R69, and R17, the voltage across the light-emitting diode of optocoupler O1 follows and rises to turn on, and then drives the photosensitive triode in the other optocoupler to turn on and pull down the output level, and transmits the signal to the MCU circuit for identification.

[0028] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A fire emergency lighting fixture driving circuit system with fault type detection, used for real-time detection of the fault state and fault type of the lighting fixture light source, characterized in that: include: MCU power supply circuit, MCU circuit, AC detection circuit, light source drive circuit, relay control circuit, light source circuit, short-circuit protection circuit, status detection circuit; the AC detection circuit transmits the signal to the MCU circuit after isolation, the MCU circuit controls to cut off the AC power supply of the rear light source drive circuit through the relay control circuit, the light source drive circuit provides power for the light source circuit, the light source circuit is electrically connected to the status detection circuit, the status detection circuit and the short-circuit protection circuit recognize the light source fault through signal detection, and then transmit the fault signal to the MCU circuit, and the status detection circuit is also electrically connected to the short-circuit protection circuit.

2. A fire emergency lighting driving circuit system with fault type detection according to claim 1, characterized in that: The AC detection circuit is composed of a diode D7, a resistor R19, a resistor R20, a resistor R25, an optocoupler ISO2, a resistor R21, and a resistor R24. The diode D7 is connected in series with resistors R19 and R20 in sequence and then electrically connected to the positive electrode of the light-emitting diode in the optocoupler ISO2. One end of the resistor R25 is connected to the power ground PGND, and the other end of the resistor R25 is electrically connected to the connection end of the resistor R20 and the light-emitting diode in the optocoupler ISO2.

3. A fire emergency lighting driving circuit system with fault type detection according to claim 2, characterized in that: The resistor R25 is connected in parallel with the light emitting diode in the optocoupler ISO2. One end of the phototransistor in the optocoupler ISO2 is grounded GND. The other end of the phototransistor in the optocoupler ISO2 is connected to a 5V power supply through a resistor R21. The resistor R21 is also electrically connected to a resistor R24.

4. A fire emergency lighting driving circuit system with fault type detection according to claim 3, characterized in that: The relay control circuit includes a resistor R54, a relay JDQ1, a capacitor E4, a capacitor E9, a diode VD16, a transistor N5, a resistor R39, a capacitor C32, and a resistor R55. The resistor R54 and the capacitor E4 are connected in parallel, the diode VD16 and the relay JDQ1 are connected in parallel, the parallel end of the diode VD16 and the relay JDQ1 is electrically connected to the collector of the transistor N5, the emitter of the transistor N5 is grounded GND, and the base of the transistor N5 is also electrically connected to the resistor R39, the capacitor C32, and the resistor R55, respectively. The resistor R39 and the capacitor C32 are connected in parallel, and the other end of the resistor R55 is electrically connected to the CT1 end.

5. A fire emergency lighting driving circuit system with fault type detection according to claim 4, characterized in that: The short-circuit protection circuit and the state detection circuit constitute a safety protection circuit, and the safety protection circuit is composed of a plurality of resistors, a plurality of capacitors, a plurality of transistors, a plurality of diodes and an optical coupler.

6. A fire emergency lighting driving circuit system with fault type detection according to claim 5, characterized in that: When a short circuit fault occurs in the light source, the light source driving circuit operates in an open circuit protection state, and the output is in a discontinuous mode. After the safety protection circuit is energized, the voltage across resistor R17 is divided by resistors R10, R58, R59, R8, and R69 to reach the optocoupler condition for opening, so that the optocoupler isolation end outputs a low-level signal. The discontinuous signal of the open circuit state of the light source driving circuit is limited by resistor R66, and then passes through diode VD5 and resistor R7 to drive the gate of transistor M2, so that transistor M2 is turned on to short-circuit resistor R8, resistor R69, and resistor R17, so that the optocoupler loses power and is cut off. The optocoupler isolation end outputs a high-level signal, thereby ensuring that the optocoupler is consistent with the light source driving circuit, entering the discontinuous mode, and outputting high and low level pulse signals.

7. A fire emergency lighting driving circuit system with fault type detection according to claim 6, characterized in that: When a short circuit occurs in the light source, the capacitor C3, diode VD3, resistor R10, resistor R58 and resistor R59 of the safety protection circuit are short-circuited, and the gate level of the transistor M2 is pulled down after the transistor N2 is turned on, so that the transistor M2 is forced to be turned off. The short circuit protection circuit realizes hard clamping through the hardware circuit, and directly cuts off the main circuit of the drive output.

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