Fire-fighting bus isolator magnetic latching malfunction detection system

Abstract

The utility model discloses a magnetic latching malfunction detection system for a fire-fighting bus isolator, which belongs to the field of fire fighting, and provides reliability for a fire-fighting alarm system when the fire-fighting bus isolator is in a vibration impact environment and a fire-fighting host is in normal communication with external alarm equipment; and the problem of misoperation of the bus isolator in a vibration impact environment can be solved, and the actions of the magnetic latching relay of the fire-fighting bus isolator can be effectively distinguished. The device mainly comprises a magnetic latching relay and an MCU control circuit, the magnetic latching relay is connected with a two-bus communication circuit, the two-bus communication circuit is connected with the MCU control circuit through a bus sampling circuit, the magnetic latching relay is respectively connected with a magnetic latching state detection circuit through a magnetic latching drive circuit, the magnetic latching state detection circuit comprises a relay K1, and the relay K1 is connected with the MCU control circuit. And a pin 8 of the relay K1 is connected with the VCC. The fire-fighting bus isolator magnetic latching misoperation detection device is mainly used for fire-fighting bus isolator magnetic latching misoperation detection.

Description

Technical Field

[0001] This utility model relates to the field of fire protection, and more specifically, to a fire protection bus isolator magnetic holding malfunction detection system. Background Technology

[0002] Fire alarm bus isolators are a crucial component of fire alarm systems, isolating the fire control panel from external alarm devices experiencing short circuits. This protects other circuits from being affected. Furthermore, once the external equipment's wiring is restored, a "reset" operation on the fire control panel can restore normal operation. However, vibration and shock can alter the state of the magnetic latching relay within the bus isolator, placing higher demands on the vibration and shock resistance of the magnetic latching relay. Detection of magnetic latching malfunctions helps prevent bus isolators from tripping due to vibration and shock.

[0003] In the fire protection industry, most bus isolators use single-pole double-throw electromagnetic relays for isolation and protection switching. However, when a product requires short-circuit power-on, a magnetic latching relay is selected. In some vibration and shock environments, or in situations with high safety requirements, magnetic latching relays may experience changes in their state due to external vibration and shock, causing downstream equipment and the main unit to malfunction. Utility Model Content

[0004] The purpose of this utility model is to provide a fire bus isolator magnetic latching malfunction detection system, in which the fire control panel and external alarm equipment communicate normally under vibration and shock environment, improving the reliability of the fire alarm system; and can solve the problem of malfunction of bus isolator under vibration and shock environment, effectively distinguishing the operation of fire bus isolator magnetic latching relay.

[0005] This utility model is achieved through the following technical solution:

[0006] A fire bus isolator magnetic latching malfunction detection system includes a magnetic latching relay and an MCU control circuit. The magnetic latching relay is connected to a two-bus communication circuit, which is connected to the MCU control circuit through a bus sampling circuit. The magnetic latching relay is connected to a magnetic latching drive circuit and a magnetic latching state detection circuit. The magnetic latching state detection circuit includes a relay K1. Pin 8 of the relay K1 is connected to VCC. Pin 9 of the relay K1 is connected in series with a protective resistor R9 and a filter capacitor C3. Pin 5 of the relay K1 is connected to a protective resistor R10 and a bidirectional Zener diode VD10.

[0007] Furthermore, the bus sampling circuit includes a rectifier, transistor VT1, and transistor VT2. The base (b) of transistor VT1 is connected to the rectifier through a filter capacitor C1 and a resistor R2. The emitter (e) of transistor VT1 and the emitter (e) of transistor VT2 are connected to the rectifier. The base (b) of transistor VT1 and the base (b) of transistor VT2 are connected to the rectifier through a resistor R5. Both transistor VT1 and transistor VT2 are connected to an optocoupler unit through diodes. The optocoupler unit is connected to a filter capacitor C2.

[0008] Furthermore, the optical coupler unit includes optical coupler D1 and optical coupler D2. The collector of transistor VT1 is connected to the cathode of optical coupler D2 through diode VD6, the collector of transistor VT2 is connected to the anode of optical coupler D1 through diode VD7, and the emitters of transistor VT1 and transistor VT2 are connected to filter capacitor C2.

[0009] Furthermore, the magnetic latching drive circuit includes a magnetic latching control chip U1, the OA pin of the magnetic latching control chip U1 is connected to the R pin of the relay K1, and the OB pin of the magnetic latching control chip U1 is connected to the S pin of the relay K1.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] 1. Under vibration and shock conditions, the fire alarm control panel and external alarm devices can communicate normally, ensuring the reliability of the fire alarm system. It can also solve the problem of malfunction of the bus isolator under vibration and shock conditions and effectively distinguish the operation of the magnetic latching relay of the fire alarm bus isolator.

[0012] 2. When relay K1 is closed, OUT_DT is high; when relay K1 is open, OUT_DT is low. Therefore, if BAD_OUT does not detect a low level (i.e., the isolator is in normal working condition), BAD_OUT will be high. If OUT_DT is high, the microcontroller (MCU control circuit) determines that the magnetic latching relay is working normally; if OUT_DT is low, the microcontroller determines that the magnetic latching relay is malfunctioning. If BAD_OUT detects a low level and activates (i.e., the isolator is in a short-circuit maintenance state and BAD_OUT is high), if OUT_DT is low, the microcontroller determines that the magnetic latching relay is working normally; if OUT_DT is high, the microcontroller determines that the magnetic latching relay is malfunctioning. After the MCU control circuit determines that the magnetic latching relay is malfunctioning, it will control the magnetic latching drive circuit to restore the magnetic latching relay to the closed state, ensuring the normal operation of external equipment and the fire alarm control panel. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is the circuit diagram of the magnetic holding state detection circuit of this utility model;

[0015] Figure 3 This is the circuit schematic diagram of the bus sampling circuit of this utility model;

[0016] Figure 4 This is the circuit diagram of the magnetic holding drive circuit of this utility model. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Example 1

[0019] like Figure 1 – Figure 4 As shown, a fire bus isolator magnetic latching malfunction detection system includes a magnetic latching relay and an MCU control circuit (existing technology). The magnetic latching relay is connected to a two-bus communication circuit, which is connected to the MCU control circuit through a bus sampling circuit. The magnetic latching relay is connected to a magnetic latching drive circuit and a magnetic latching state detection circuit. The magnetic latching state detection circuit includes a relay K1. Pin 8 of the relay K1 is connected to VCC. Pin 9 of the relay K1 is connected in series with a protection resistor R9 and a filter capacitor C3. Pin 5 of the relay K1 is connected to a protection resistor R10 and a bidirectional Zener diode VD10.

[0020] When relay K1 is closed, OUT_DT is high; when relay K1 is open, OUT_DT is low. Therefore, if BAD_OUT does not detect a low level (i.e., the isolator is in normal working condition), BAD_OUT is high. If OUT_DT is high, the microcontroller (MCU control circuit) determines the magnetic latching relay is working normally; if OUT_DT is low, the microcontroller determines the magnetic latching relay is malfunctioning. If BAD_OUT detects a low level and activates (i.e., the isolator is in a short-circuit sustaining state and BAD_OUT is high), if OUT_DT is low, the microcontroller determines the magnetic latching relay is working normally; if OUT_DT is high, the microcontroller determines the magnetic latching relay is malfunctioning. This achieves the detection of malfunctions in the magnetic latching mechanism of the fire bus isolator.

[0021] Example 2: A fire bus isolator magnetic latching malfunction detection system, wherein the bus sampling circuit includes a rectifier (diodes VD1, VD2, VD4, and VD5), transistors VT1 and VT2. The base (b) of transistor VT1 is connected to the rectifier through a filter capacitor C1 and a resistor R2. The emitters (e) of transistors VT1 and VT2 are connected to the rectifier. The bases of transistors VT1 and VT2 are connected to the rectifier through a resistor R5. Resistors R2, R3, R4, and R5 together form a voltage divider resistor and are connected to the rectifier. Both transistors VT1 and VT2 are connected to an optocoupler unit through diodes. The optocoupler unit is connected to a filter capacitor C2. The optocoupler unit includes optocouplers D1 and D2. The collector (c) of transistor VT1 is connected to the cathode of optocoupler D2 through a diode VD6. The collector (c) of transistor VT2 is connected to the anode of optocoupler D1 through a diode VD7. The emitters of transistors VT1 and VT2 are connected to the filter capacitor C2.

[0022] The bus sampling circuit detects the bus operating status in real time and uses a rectifier to achieve non-polarity bus switching. When the current in resistor R2 is less than the overcurrent or short-circuit protection threshold, transistor VT1 or transistor VT2 is turned off, BAD_OUT is high, the microcontroller determines that the bus communication is normal, and the magnetic latching relay is in the closed state. When the current in resistor R2 is greater than the overcurrent or short-circuit protection threshold, transistor VT1 or transistor VT2 is turned on, BAD_OUT is low, the microcontroller determines that the bus is overcurrent or short-circuited, thus realizing the detection of non-polarity bus current.

[0023] The magnetic latching drive circuit includes a magnetic latching control chip U1. The OA pin of the magnetic latching control chip U1 is connected to the R pin of the relay K1, and the OB pin of the magnetic latching control chip U1 is connected to the S pin of the relay K1. The magnetic latching drive circuit realizes the opening and closing control of the magnetic latching relay. When the bus is in normal working state, GLQ_OUT_ON outputs a low level and GLQ_OUT_OFF outputs a high level, at which time the relay K1 is closed. When the bus is in overcurrent or short circuit state, GLQ_OUT_ON outputs a high level and GLQ_OUT_OFF outputs a low level, at which time the relay K1 is open. Other aspects are the same as in Embodiment 1.

[0024] When the fire bus isolator is in normal working condition, the bus sampling circuit outputs a high level, the magnetic latching state detection circuit outputs a high level, and the magnetic latching relay is in the closed state.

[0025] When the bus experiences an overcurrent, the bus sampling circuit outputs a low level, the MCU control circuit controls the magnetic latching drive circuit, causing the magnetic latching relay to be in the open state, and the magnetic latching state detection circuit will output a low level.

[0026] When the isolator is in a short-circuit sustaining state, if OUT_DT is high, the microcontroller determines that the magnetic latching relay has malfunctioned. At this time, the MCU control circuit will determine that the magnetic latching relay is in a malfunctioning state, and the MCU control circuit will control the magnetic latching drive circuit to restore the magnetic latching relay to the closed state, ensuring that the external equipment and the fire alarm control panel work normally.

Claims

1. A fire bus isolator magnetic latching malfunction detection system, comprising a magnetic latching relay and an MCU control circuit, wherein the magnetic latching relay is connected to a two-bus communication circuit, characterized in that: The dual-bus communication circuit is connected to the MCU control circuit through the bus sampling circuit. The magnetic latching relay is connected through the magnetic latching drive circuit and the magnetic latching state detection circuit. The magnetic latching state detection circuit includes a relay K1. Pin 8 of the relay K1 is connected to VCC. Pin 9 of the relay K1 is connected in series with a protection resistor R9 and a filter capacitor C3. Pin 5 of the relay K1 is connected to a protection resistor R10 and a bidirectional Zener diode VD10.

2. The fire protection bus isolator magnetic latching malfunction detection system according to claim 1, characterized in that: The bus sampling circuit includes a rectifier, transistor VT1, and transistor VT2. The base (b) of transistor VT1 is connected to the rectifier through a filter capacitor C1 and a resistor R2. The emitter (e) of transistor VT1 and the emitter (e) of transistor VT2 are connected to the rectifier. The base (b) of transistor VT1 and the base (b) of transistor VT2 are connected to the rectifier through a resistor R5. Both transistor VT1 and transistor VT2 are connected to an optocoupler unit through diodes. The optocoupler unit is connected to a filter capacitor C2.

3. The fire protection bus isolator magnetic latching malfunction detection system according to claim 2, characterized in that: The optical coupler unit includes optical coupler D1 and optical coupler D2. The collector of transistor VT1 is connected to the cathode of optical coupler D2 through diode VD6, and the collector of transistor VT2 is connected to the anode of optical coupler D1 through diode VD7. The emitters of transistor VT1 and transistor VT2 are connected to filter capacitor C2.

4. The fire protection bus isolator magnetic latching malfunction detection system according to claim 1, characterized in that: The magnetic latching drive circuit includes a magnetic latching control chip U1. The OA pin of the magnetic latching control chip U1 is connected to the R pin of the relay K1, and the OB pin of the magnetic latching control chip U1 is connected to the S pin of the relay K1.

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