Emergency alarm system

Abstract

The utility model provides an emergency alarm system, and belongs to the technical field of emergency alarm. The emergency alarm system comprises a smoke detection module, a central control module, a first switch, a work indication module, an emergency starting module, a boost module, an emergency alarm module and an energy storage capacitor. The output end of the smoke detection module is connected with the central control module; the energy storage capacitor is connected in parallel with the output end of the working power supply; the first end of the first switch is connected with the output end of the working power supply, the second end of the first switch is connected with the control end of the emergency starting module, and the control end of the first switch is connected with the central control module; the power supply end of the boost module is connected with the energy storage capacitor. The output end of the boost module is used for supplying power to the emergency alarm module. The control end of the emergency alarm module is connected with the output end of the emergency starting module. According to the invention, the stability and reliability of emergency alarm can be improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of emergency alarm, and in particular to an emergency alarm system. BACKGROUND

[0002] In many real scenarios, safety is a crucial factor, especially in environments prone to fire, power failure and other dangers. The traditional alarm system can usually only provide a single smoke detection function, and the reliability is low. In the event of an emergency, the noisy sound environment makes it difficult for relevant personnel to notice the alarm information, delaying the escape opportunity.

[0003] Therefore, there is a need for a stable and reliable emergency alarm system. CONTENT OF THE INVENTION

[0004] The present disclosure provides an emergency alarm system to solve the problem of low stability and reliability of the existing emergency alarm system.

[0005] The present disclosure provides an emergency alarm system, comprising: a smoke detection module, a central control module, a first switch, a working indication module, an emergency starting module, a boost module, an emergency alarm module and an energy storage capacitor;

[0006] The output end of the smoke detection module is connected with the central control module;

[0007] The energy storage capacitor is connected in parallel with the output end of the working power supply;

[0008] The first end of the first switch is connected with the output end of the working power supply, the second end of the first switch is connected with the control end of the emergency starting module, and the control end of the first switch is connected with the central control module;

[0009] The power supply end of the boost module is connected with the energy storage capacitor, and the output end of the boost module is used to supply power for the emergency alarm module;

[0010] The control end of the emergency alarm module is connected with the output end of the emergency starting module.

[0011] In an exemplary embodiment of the present disclosure, the working indication module comprises: a resistor R22, a voltage stabilizing diode VS4, a light emitting diode D1 and a capacitor C11;

[0012] The anode of the light emitting diode D1 is connected with the working power supply through the resistor R22, and the cathode of the light emitting diode D1 is grounded;

[0013] The anode of the voltage stabilizing diode VS4 is grounded, the cathode of the voltage stabilizing diode VS4 is connected with the working power supply; the capacitor C11 is connected in parallel with the voltage stabilizing diode VS4; and the first end of the capacitor C11 is connected with the first end of the first switch.

[0014] In an example embodiment of the present disclosure, the emergency starting module comprises: a resistor R20, a resistor R21, a light emitting diode D2, a diode D5, a triode Q5, a triode Q6, a photo triode Q7, a resistor R17 and a resistor R18;

[0015] The anode of the light emitting diode D2 is connected to the second end of the first switch through the resistor R21; the cathode of the light emitting diode D2 is grounded;

[0016] The base of the photo triode Q7 is configured to receive light source information of the light emitting diode D2, the collector of the photo triode Q7 is connected to the cathode of the diode D5 through the resistor R20, and the emitter of the photo triode Q7 is grounded;

[0017] The anode of the diode D5 is connected to the second end of the first switch;

[0018] The base of the triode Q6 is connected to the collector of the photo triode, the collector of the triode Q6 is connected to the cathode of the diode D5, and the emitter of the triode Q6 is connected to the base of the triode Q5 through the resistor R18;

[0019] The base of the triode Q5 is grounded through the resistor R17, the collector of the triode Q5 is connected to the emergency alarm module, and the emitter of the triode Q5 is grounded.

[0020] In an example embodiment of the present disclosure, the boost module comprises: a boost chip U3, a resistor R13, a resistor R14, a resistor R15, a sliding resistor R16, a resistor R19, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, a MOS tube Q4, a diode D4, an inductor L4 and a voltage stabilizing diode VS3;

[0021] The first end of the resistor R13 is connected to the cathode of the diode D5, and the collector end of the boost chip U3 and the non-inverting input end of the boost chip U3 are both connected to the second end of the resistor R13;

[0022] The anode of the capacitor C9 is connected to the second end of the resistor R13, and the cathode of the capacitor C9 is grounded;

[0023] The power input end of the boost chip U3 is connected to the driving input end of the boost chip U3 through the resistor R19;

[0024] The timing capacitor connection end of the boost chip U3 is grounded through the capacitor C10, and the ground end of the boost chip U3 is grounded;

[0025] The emitter end of the boost chip U3 is connected to the gate of the MOS tube Q4, the source of the MOS tube Q4 is grounded, and the drain of the MOS tube Q4 is connected to the driving output end of the boost chip U3 through the inductor L4;

[0026] The first end of the resistor R14 is connected to the emitter end of the boost chip U3, and the second end of the resistor R14 is grounded.

[0027] The anode of the diode D4 is connected to the drain of the MOS tube Q4, the cathode of the diode D4 is connected to the cathode of the voltage stabilizing diode VS3, the anode of the voltage stabilizing diode VS3 is connected to the first end of the slide resistor R16, and the second end of the slide resistor R16 and the slide end of the slide resistor R16 are both connected to the inverting input end of the boost chip U3.

[0028] The second end of the slide resistor R16 is grounded through the resistor R15, the anode of the capacitor C8 is connected to the cathode of the diode D4, the cathode of the capacitor C8 is grounded, the anode of the capacitor C7 is connected to the cathode of the diode D4, and the cathode of the capacitor C7 is grounded.

[0029] In an exemplary embodiment of the present disclosure, the emergency alarm module comprises a piezoelectric ceramic sheet P1 and a warning light L3.

[0030] The first end of the piezoelectric ceramic sheet P1 is connected to the cathode of the diode D4, and the second end of the piezoelectric ceramic sheet P1 is connected to the collector of the triode Q5.

[0031] The warning light L3 is connected in parallel with the piezoelectric ceramic sheet P1.

[0032] In an exemplary embodiment of the present disclosure, the emergency alarm system further comprises a temperature detection module.

[0033] The temperature detection module is connected to the central control module.

[0034] In an exemplary embodiment of the present disclosure, the emergency alarm system further comprises a switching quantity detection module and a storage module.

[0035] The output end of the switching quantity detection module is connected to the second end of the first switch

[0036] The output end of the switching quantity detection module is connected to the storage module.

[0037] The emergency alarm system provided by the embodiments of the present disclosure has the following beneficial effects:

[0038] Under normal power supply conditions, the energy storage capacitor is continuously charged as a reserve power source. Once the working power supply fails or the smoke concentration exceeds the standard, the present disclosure can quickly switch to the emergency mode, supply power through the energy storage capacitor and through the boost module, ensure that the emergency alarm module can emit loud sound and high-brightness light intensity, timely remind relevant personnel to take countermeasures, and improve the stability and reliability of the emergency alarm. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.

[0040] Figure 1 is a structural schematic diagram of an emergency alarm system provided by an embodiment of the present disclosure;

[0041] Figure 2 is a structural schematic diagram of a second emergency alarm system provided by an embodiment of the present disclosure;

[0042] Figure 3 is a structural schematic diagram of a third emergency alarm system provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0043] In order to make the person skilled in the art better understand the present scheme, the technical solutions in the embodiments of the present scheme will be clearly described below in combination with the drawings in the embodiments of the present scheme. Obviously, the described embodiments are only some of the embodiments of the present scheme, not all. Based on the embodiments in the present scheme, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present scheme.

[0044] The term "include" and other any variants thereof in the specification and claims of the present scheme and the above-mentioned drawings means "include but not limited to", which is intended to cover non-exclusive inclusion, and is not limited to the examples listed in the text. In addition, the terms "first" and "second" and the like are used to distinguish different objects, not to describe a specific order.

[0045] The implementation of the present disclosure will be described in detail below in combination with specific drawings:

[0046] Figure 1 is a structural schematic diagram of an emergency alarm system provided by an embodiment of the present disclosure. Referring to Figure 1 , the emergency alarm system comprises a smoke detection module 10, a central control module 11, a first switch 12, a working indication module 13, an emergency starting module 14, a boost module 15, an emergency alarm module 16 and an energy storage capacitor 17;

[0047] The output end of the smoke detection module 10 is connected with the central control module 11;

[0048] The energy storage capacitor 17 is connected in parallel with the output end of the working power supply;

[0049] The first end of the first switch 12 is connected with the output end of the working power supply, the second end of the first switch 12 is connected with the control end of the emergency starting module 14, and the control end of the first switch 12 is connected with the central control module 11.

[0050] The power supply end of the boost module 15 is connected with the energy storage capacitor 17, and the output end of the boost module 15 is used for supplying power for the emergency alarm module 16.

[0051] The control end of the emergency alarm module 16 is connected with the output end of the emergency starting module 14.

[0052] In the embodiment, the present disclosure can be applied in scenic spots, hospitals, schools and other areas. The working power supply can be a mains power supply, and the smoke detection module 10 can be a smoke sensor and a smoke comparator. When the working power supply supplies power normally and the smoke detection is normal, the light-emitting diode in the working indication module 13 is lit, proving that the system is in a normal working state, and at the same time, the working power supply provides power for the energy storage capacitor 17, and the energy storage capacitor 17 stores electrical energy. At this time, the first switch 12 is in a closed state, but the emergency starting module 14 does not act, the energy storage capacitor 17 is in a charging state at this time, the boost module 15 has no voltage input, and the emergency alarm module 16 does not alarm.

[0053] When the working power supply (for example, the mains power supply) is powered off, or the smoke concentration detected by the smoke sensor in the smoke detection module 10 exceeds the reference smoke signal of the smoke comparator, the central control module 11 controls the first switch 12 to be disconnected, at this time, the emergency starting module 14 cannot receive the power supply voltage. At this time, the energy storage capacitor 17 discharges, the emergency starting module 14 starts to form a loop with the energy storage capacitor 17, the boost module 15 and the emergency alarm module 16, at this time, the energy storage capacitor 17 provides power for the boost module 15, and the boost module 15 provides the voltage after boosting to the emergency alarm module 16. Since the voltage is the voltage after boosting, the emergency alarm module 16 can emit a louder sound and a higher light intensity, reminding the relevant personnel of power failure or possible fire.

[0054] If it is only a working power supply failure, the light-emitting diode in the working indication module 13 is extinguished at this time, if smoke alarm occurs, the light-emitting diode in the working indication module 13 still emits light at this time, and the emergency situation can be preliminarily judged by observing when the light-emitting diode in the working indication module 13 is lit.

[0055] From the above, it can be concluded that, under normal power supply conditions, the energy storage capacitor 17 is continuously charged as a reserve power supply, and once the working power supply fails or the smoke concentration is detected to be excessive, the present disclosure can quickly switch to an emergency mode, supply power through the energy storage capacitor 17 and through the boost module 15, and ensure that the emergency alarm module 16 can emit a loud sound and a high-brightness light intensity, timely reminding the relevant personnel to take countermeasures, and improving the stability and reliability of the emergency alarm.

[0056] Figure 2 is a structural schematic diagram of a second emergency alarm system provided by the embodiments of the present disclosure, referring to Figure 2 In an embodiment of the present disclosure, the working indication module 13 comprises: a resistor R22, a voltage stabilizing diode VS4, a light emitting diode D1 and a capacitor C11.

[0057] The anode of the light emitting diode D1 is connected to the working power supply through the resistor R22, and the cathode of the light emitting diode D1 is grounded.

[0058] The anode of the voltage stabilizing diode VS4 is grounded, and the cathode of the voltage stabilizing diode VS4 is connected to the working power supply; the capacitor C11 is connected in parallel with the voltage stabilizing diode VS4; the first end of the capacitor C11 is connected to the first end of the first switch 12.

[0059] In an embodiment of the present disclosure, the emergency starting module 14 comprises: a resistor R20, a resistor R21, a light emitting diode D2, a diode D5, a triode Q5, a triode Q6, a photosensitive triode Q7, a resistor R17 and a resistor R18.

[0060] The anode of the light emitting diode D2 is connected to the second end of the first switch 12 through the resistor R21; the cathode of the light emitting diode D2 is grounded.

[0061] The base of the photosensitive triode Q7 is configured to receive light source information of the light emitting diode D2, the collector of the photosensitive triode Q7 is connected to the cathode of the diode D5 through the resistor R20, and the emitter of the photosensitive triode Q7 is grounded.

[0062] The anode of the diode D5 is connected to the second end of the first switch 12.

[0063] The base of the triode Q6 is connected to the collector of the photosensitive triode, the collector of the triode Q6 is connected to the cathode of the diode D5, and the emitter of the triode Q6 is connected to the base of the triode Q5 through the resistor R18.

[0064] The base of the triode Q5 is grounded through the resistor R17, the collector of the triode Q5 is connected to the emergency alarm module 16, and the emitter of the triode Q5 is grounded.

[0065] In the present embodiment, the working power supply can be regarded as an alternating current power supply U5, which outputs a direct current power supply after being processed by a resistance-capacitance voltage reduction circuit of a resistor R23, a resistor R24 and a capacitor C12 and a rectifier bridge U6, wherein the resistor R23 and the resistor R24 are connected in parallel with the capacitor C12, and the alternating current power supply U5 is connected to the input end of the rectifier bridge U6 through the capacitor C12.

[0066] The power supply outputted from the output end of the rectifier bridge U6 is stabilized by the voltage stabilizing diode VS4 and filtered by the capacitor C11, and then a voltage is generated across the capacitor C11 to provide power supply for the subsequent circuit. In addition, the output end of the rectifier bridge U6 also provides power supply for the light emitting diode D1, and at this time, the light emitting diode D1 emits light as an operating indicator lamp.

[0067] If the operating state is normal at this time, the light emitting diode D1 is bright, and at the same time, the light emitting diode D2 is also bright. At this time, the base of the photo triode Q7 receives the light of the light emitting diode (the light emitting diode D2 and the photo triode Q6 should be externally provided with an opaque protective shell to prevent external light intensity interference), and at this time, the photo triode Q7 is turned on, the base of the triode Q6 is at a low level, and since the triode Q6 is an NPN type, at this time, the triode Q6 is cut off, resulting in that the base of the triode Q5 is also at a low level, the triode Q5 is an NPN type triode, the triode Q5 is cut off, and at this time, the boost module 15, the energy storage capacitor 17 and the emergency alarm module 16 cannot form a current loop, that is, the emergency alarm module 16 cannot work.

[0068] When the power supply is cut off or the smoke detection module 10 sends "1" to the central control module 11, the central control module 11 controls the first switch 12 to be turned off, at this time, the light emitting diode D2 is extinguished, the base of the photo triode Q7 is at a low level, and the photo triode Q7 is cut off. At this time, the energy storage capacitor 17 is discharged, and due to the existence of the diode D5, the light emitting diode D2 cannot be powered, at this time, the base voltage of the triode Q6 is at a high level, the triode Q6 is turned on, the base of the triode Q5 is also at a high level, the triode Q5 is turned on, at this time, the energy storage capacitor 17, the boost module 15 and the emergency alarm module 16 form a current loop, and at this time, the audible and visual emergency alarm is performed.

[0069] From the above, it can be concluded that in the embodiment, the light emitting diode D1 is used as an operating indicator lamp, which can intuitively reflect the operating state of the system. The emergency starting module 14 detects the brightness change of the light emitting diode D2 through the photo triode Q7 to determine whether the system is in a normal operating state. When the power supply is cut off or smoke is detected, the light emitting diode D2 is extinguished, the photo triode Q7 is cut off, and the emergency starting logic is triggered. In the embodiment, the triode amplification circuit is used in the emergency starting module 14, which can quickly respond to the state change of the photo triode Q7, quickly start the boost module 15 and the emergency alarm module 16, and realize the audible and visual emergency alarm.

[0070] Figure 2 is a structural schematic diagram of a second emergency alarm system provided by the embodiment of the present disclosure, referring to Figure 2In an embodiment of the present disclosure, the voltage boosting module 15 comprises: a voltage boosting chip U3, a resistor R13, a resistor R14, a resistor R15, a sliding resistor R16, a resistor R19, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, a MOS tube Q4, a diode D4, an inductor L4 and a voltage stabilizing diode VS3;

[0071] The first end of the resistor R13 is connected with the cathode of the diode D5, and the second end of the resistor R13 is connected with the collector end of the voltage boosting chip U3 and the non-inverting input end of the voltage boosting chip U3;

[0072] The anode of the capacitor C9 is connected with the second end of the resistor R13, and the cathode of the capacitor C9 is grounded.

[0073] The power input end of the voltage boosting chip U3 is connected with the driving input end of the voltage boosting chip U3 through the resistor R19.

[0074] The timing capacitor connection end of the voltage boosting chip U3 is grounded through the capacitor C10, and the ground end of the voltage boosting chip U3 is grounded.

[0075] The emitter end of the voltage boosting chip U3 is connected with the gate of the MOS tube Q4, the source of the MOS tube Q4 is grounded, and the drain of the MOS tube Q4 is connected with the driving output end of the voltage boosting chip U3 through the inductor L4.

[0076] The first end of the resistor R14 is connected with the emitter end of the voltage boosting chip U3, and the second end of the resistor R14 is grounded.

[0077] The anode of the diode D4 is connected with the drain of the MOS tube Q4, the cathode of the diode D4 is connected with the cathode of the voltage stabilizing diode VS3, the anode of the voltage stabilizing diode VS3 is connected with the first end of the sliding resistor R16, and the second end and the sliding end of the sliding resistor R16 are both connected with the inverting input end of the voltage boosting chip U3.

[0078] The second end of the sliding resistor R16 is grounded through the resistor R15, the anode of the capacitor C8 is connected with the cathode of the diode D4, the cathode of the capacitor C8 is grounded, the anode of the capacitor C7 is connected with the cathode of the diode D4, and the cathode of the capacitor C7 is grounded.

[0079] In an embodiment of the present disclosure, the emergency alarm module 16 comprises: a piezoelectric ceramic sheet P1 and a warning light L3.

[0080] The first end of the piezoelectric ceramic sheet P1 is connected with the cathode of the diode D4, and the second end of the piezoelectric ceramic sheet P1 is connected with the collector of the triode Q5.

[0081] The warning light L3 is connected in parallel with the piezoelectric ceramic sheet P1.

[0082] In this embodiment, the model of the boost chip U3 can be MC34063, the timing capacitor is connected to the timing capacitor, that is, the capacitor C10, the capacity of the capacitor C10 determines the oscillation frequency of the internal oscillator of the boost chip U3, the No. 5 pin is the inverting input terminal of the internal comparator, which can sample the output voltage and control the final output voltage.

[0083] When the energy storage capacitor 17 supplies power, it is first input to the collector terminal, the non-inverting input terminal and the power input terminal of the boost chip U3. The external MOS tube Q4 plays the role of expanding current. When the MOS tube Q4 is turned on, the power supply voltage will be current sampled through the resistor R19, through the inductor L4, through the MOS tube Q4 to ground, forming a loop. At this time, the power supply voltage will be added to the two ends of the inductor L4, and the inductor L4 stores energy. When the MOS tube Q4 is disconnected for an instant, the current on the inductor L4 cannot change suddenly, so an induced voltage will be generated at the two ends of the inductor L4. Therefore, the induced voltage on the inductor L4 will be superimposed on the input DC voltage at this time, output through the diode D4, and play the role of voltage boosting.

[0084] When the output voltage exceeds a certain voltage, the voltage stabilizing diode VS3 will be broken down. After breakdown, the voltage is adjusted by the sliding resistor R16 and the resistor R15 and input to the inverting input terminal of the boost chip U3. The non-inverting input terminal of the built-in comparator is connected to the built-in 1.25-volt reference source, so it will compare the input voltage with the reference voltage, that is, 1.25 volts. If the voltage exceeds 1.25 volts, the output terminal of the comparator will output low level, and play the role of stabilizing voltage.

[0085] Because the efficiency of the piezoelectric ceramic sheet P1 in converting mechanical vibration is relatively low, the sound is small, and it is difficult to detect in a relatively noisy environment, so the voltage can be raised by the boost chip U3 to drive the piezoelectric ceramic sheet P1 and the warning light L3, so that it emits a higher sound and a stronger light, attracting the attention of the relevant personnel.

[0086] From the above, in the embodiment, when the energy storage capacitor 17 supplies power, the voltage is boosted by controlling the conduction and disconnection of the MOS tube Q4, and using the energy storage and release characteristics of the inductor L4. The voltage regulating circuit composed of the voltage stabilizing diode VS3, the sliding resistor R16 and the resistor R15 samples and adjusts the output voltage after voltage boosting, to ensure that the output voltage is stable within the preset range. When the output voltage exceeds the set threshold, the voltage stabilizing diode VS3 is broken down, and after being divided by the sliding resistor R16 and the resistor R15, the voltage is input to the inverting input terminal of the boost chip U3, and compared with the built-in reference source, so as to adjust the output voltage and realize voltage stabilization. The piezoelectric ceramic sheet P1 and the warning light L3 are connected in parallel in the emergency alarm module 16, to realize the sound and light dual alarm effect. After the voltage is boosted by the voltage boosting module 15, the piezoelectric ceramic sheet P1 emits a loud sound, and the warning light L3 is lit at the same time, to attract the attention of relevant personnel, and improve the timeliness and effectiveness of the emergency alarm. In the embodiment, the voltage is increased by the voltage boosting module 15, the sound emitting intensity of the piezoelectric ceramic sheet P1 is enhanced, the sound is louder, and the alarm information can be effectively conveyed even in a noisy environment.

[0087] Figure 3 is a structural schematic diagram of a third emergency alarm system provided by the embodiment of the disclosure, referring to Figure 3 In an embodiment of the disclosure, an emergency alarm system further comprises a temperature detection module 18.

[0088] The temperature detection module 18 is connected with the central control module 11.

[0089] In an embodiment of the disclosure, an emergency alarm system further comprises a switching quantity detection module 19 and a storage module 20.

[0090] The output end of the switching quantity detection module 19 is connected with the second end of the first switch 12

[0091] The output end of the switching quantity detection module 19 is connected with the storage module 20.

[0092] In the embodiment, the temperature detection module 18 can comprise a temperature sensor and a temperature comparator. When the temperature value detected by the temperature sensor is greater than the temperature reference value preset by the temperature comparator, the temperature comparator sends “1” to the central control module 11, and at this time, the central control module 11 controls the first switch 12 to be disconnected. The subsequent emergency alarm module 16 alarms.

[0093] The switching quantity detection module 19 can detect the closing and disconnection of the first switch 12, and store the state information of the first switch 12 in the storage module 20, so as to provide data support for subsequent inquiry of when the fire occurs.

[0094] From the above, the embodiment adds another emergency alarm condition through the temperature detection module 18, improves the reliability of the disclosure, and the switching value detection module 19 can detect the closing and opening states of the first switch 12 in real time and store the information in the storage module 20, which is helpful for subsequent query of the time point of fire occurrence and the state of the first switch 12, and provides important data support for the investigation of fire accidents.

[0095] The above embodiments are only used to illustrate the technical solutions of the disclosure, but not limit the disclosure; although the disclosure is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the disclosure.

Claims

1. An emergency alert system, characterized by The application relates to a smoke detection and emergency starting device, which comprises a smoke detection module, a central control module, a first switch, a working indication module, an emergency starting module, a voltage boosting module, an emergency alarm module and an energy storage capacitor. The output end of the smoke detection module is connected with the central control module. The energy storage capacitor is connected in parallel with the output end of a working power supply. The first end of the first switch is connected with the output end of the working power supply, the second end of the first switch is connected with the control end of the emergency starting module, and the control end of the first switch is connected with the central control module. The power supply end of the voltage boosting module is connected with the energy storage capacitor, and the output end of the voltage boosting module is used for supplying power to the emergency alarm module. The control end of the emergency alarm module is connected with the output end of the emergency starting module.

2. A panic alarm system as claimed in claim 1, wherein The working indication module comprises a resistor R22, a voltage stabilizing diode VS4, a light emitting diode D1 and a capacitor C11. The anode of the light emitting diode D1 is connected with the working power supply through the resistor R22, and the cathode of the light emitting diode D1 is grounded. The anode of the voltage stabilizing diode VS4 is grounded, the cathode of the voltage stabilizing diode VS4 is connected with the working power supply, the capacitor C11 is connected in parallel with the voltage stabilizing diode VS4, and the first end of the capacitor C11 is connected with the first end of the first switch.

3. A panic alarm system as claimed in claim 1, wherein, The emergency starting module comprises a resistor R20, a resistor R21, a light emitting diode D2, a diode D5, a triode Q5, a triode Q6, a light sensitive triode Q7, a resistor R17 and a resistor R18. The anode of the light emitting diode D2 is connected with the second end of the first switch through the resistor R21, and the cathode of the light emitting diode D2 is grounded. The base of the light sensitive triode Q7 is configured to receive light source information of the light emitting diode D2, the collector of the light sensitive triode Q7 is connected with the cathode of the diode D5 through the resistor R20, and the emitter of the light sensitive triode Q7 is grounded. The anode of the diode D5 is connected with the second end of the first switch. The base of the triode Q6 is connected with the collector of the light sensitive triode, the collector of the triode Q6 is connected with the cathode of the diode D5, and the emitter of the triode Q6 is connected with the base of the triode Q5 through the resistor R18. The base of the triode Q5 is grounded through the resistor R17, the collector of the triode Q5 is connected with the emergency alarm module, and the emitter of the triode Q5 is grounded.

4. A panic alarm system as claimed in claim 3, wherein the alarm signal is transmitted to the alarm centre by means of a cellular telephone network. The voltage boosting module comprises a voltage boosting chip U3, a resistor R13, a resistor R14, a resistor R15, a sliding resistor R16, a resistor R19, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, a MOS tube Q4, a diode D4, an inductor L4 and a voltage stabilizing diode VS3. The first end of the resistor R13 is connected with the cathode of the diode D5, the collector end of the voltage boosting chip U3 and the non-inverting input end of the voltage boosting chip U3 are both connected with the second end of the resistor R13. The anode of the capacitor C9 is connected with the second end of the resistor R13, and the cathode of the capacitor C9 is grounded. The power input end of the boost chip U3 is connected with the driving input end of the boost chip U3 through the resistor R19; The timing capacitor connection end of the boost chip U3 is connected with the ground through the capacitor C10, and the ground end of the boost chip U3 is grounded; The emitter end of the boost chip U3 is connected with the gate of the MOS tube Q4, the source of the MOS tube Q4 is grounded, and the drain of the MOS tube Q4 is connected with the driving output end of the boost chip U3 through the inductor L4; The first end of the resistor R14 is connected with the emitter end of the boost chip U3, and the second end of the resistor R14 is grounded; The anode of the diode D4 is connected with the drain of the MOS tube Q4, the cathode of the diode D4 is connected with the cathode of the voltage stabilizing diode VS3, the anode of the voltage stabilizing diode VS3 is connected with the first end of the slide resistor R16, the second end of the slide resistor R16 and the slide end of the slide resistor R16 are both connected with the inverting input end of the boost chip U3; The second end of the slide resistor R16 is grounded through the resistor R15, the anode of the capacitor C8 is connected with the cathode of the diode D4, the cathode of the capacitor C8 is grounded, the anode of the capacitor C7 is connected with the cathode of the diode D4, and the cathode of the capacitor C7 is grounded.

5. A panic alarm system as claimed in claim 4, wherein the alarm signal is transmitted to the alarm centre by means of a cellular telephone network. The emergency alarm module comprises a piezoelectric ceramic sheet P1 and a warning light L3; The first end of the piezoelectric ceramic sheet P1 is connected with the cathode of the diode D4, and the second end of the piezoelectric ceramic sheet P1 is connected with the collector of the triode Q5; The warning light L3 is connected with the piezoelectric ceramic sheet P1 in parallel.

6. A panic alarm system as claimed in claim 1, wherein, Further comprising: A temperature detection module; The temperature detection module is connected with the central control module.

7. A panic alarm system as defined in claim 1, wherein Further comprising: A switching quantity detection module and a storage module; The output end of the switching quantity detection module is connected with the second end of the first switch The output end of the switching quantity detection module is connected with the storage module.

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