A power outage sign

Abstract

The utility model discloses a power outage indicator, which is applied to the electrical field. The power supply of all electrical components is controlled by a self-locking switch. When the pyroelectric human body sensing module senses a signal, it outputs a driving signal to the first driving circuit and the second driving circuit. After the first driving circuit receives the driving signal, the first switch is closed to generate an oscillating driving signal, so that the indicator light forms a flashing state, thereby playing a better prompting role. After the second driving circuit receives the driving signal, the second switch is closed, so that the voice alarm module starts to issue a voice prompt. Compared with the static prompt method, this power outage indicator is a dynamic prompt method, and the oscillating driving signal has a better prompt effect than the single level method. In addition, the self-locking switch can reduce the number of operations, which is quick and efficient. Finally, the voice alarm prompt and the indicator light prompt are combined to achieve a better prompt effect.

Description

Technical Field

[0001] The utility model relates to the field of electrical technology, in particular to a power outage indicator. Background Art

[0002] Electrical operations in factories and mines have strict safety and quality operation procedures to ensure electrical construction safety. Misoperation can easily lead to accidents such as electric shock, electrical fires, and damage to electrical equipment.

[0003] Normally, in certain power distribution situations, strict operating specifications are required. For example, the safety regulations have strict requirements for power outages of electrical equipment, and a power outage sign is implemented (someone is working, closing the switch is prohibited) and a power outage sign is removed. The power outage sign used for a long time is a thin plate with a black (or red) warning plaque printed on a white background, which is hung on the power switch of the equipment.

[0004] If the above-mentioned warning plaque is hung in an unreasonable position, it may not be seen, which poses a great safety risk. In addition, it requires operation and maintenance personnel to hang and remove it, which is not smart enough. Utility Model Content

[0005] The utility model aims to provide a power outage indicator sign, which is used to overcome the problems of high safety risk and lack of intelligence.

[0006] In order to solve the above technical problems, the utility model provides a power outage indicator, including: a pyroelectric human body sensing module, a voice alarm module, an indicator light, a first drive circuit for outputting an oscillation drive signal, a second drive circuit and a self-locking switch, wherein the first drive circuit and the second drive circuit respectively include a first switch and a second switch;

[0007] One end of the self-locking switch is connected to the battery pack, and the other end is connected to the pyroelectric human body sensing module and the voice alarm module respectively;

[0008] The pyroelectric human body sensing module is used to detect a biological body approaching signal and output a driving signal when a biological body approaching signal is detected;

[0009] The first driving circuit is connected to the pyroelectric human body sensing module and is used to control the first switch to close when receiving the driving signal to generate an oscillating driving signal to turn on or off the indicator light;

[0010] The second driving circuit is connected to the pyroelectric human body sensing module, and is used to control the second switch to close to turn on the voice alarm module when receiving the driving signal.

[0011] Preferably, the first switch is a first transistor, and the first driving circuit further includes a first resistor, a second resistor, a fifth resistor, a second transistor and a timer circuit;

[0012] The first end of the first resistor is connected to the output end of the pyroelectric human body sensing module, the second end of the first resistor is connected to the base of the first transistor, the collector of the first transistor is connected to the first end of the second resistor, the emitter of the first transistor is grounded, the second end of the second resistor is connected to the base of the second transistor, the emitter of the second transistor is connected to the power supply end of the pyroelectric human body sensing module, the collector of the second transistor is connected in series with the fifth resistor and the indicator light in sequence, and the other end of the indicator light is grounded through the timer circuit.

[0013] Preferably, the timer circuit comprises: a third resistor, a fourth resistor, a sixth resistor, a capacitor, a diode, a control chip and a third triode; the fourth resistor is a sliding rheostat;

[0014] The first end of the third resistor is connected to the collector of the second transistor, the second end of the third resistor is respectively connected to the first fixed end of the fourth resistor, the anode of the diode, and the discharge end of the control chip, the second fixed end of the fourth resistor and the moving end of the fourth resistor are both connected to the first end of the capacitor, the cathode of the diode, the low trigger end of the control chip and the threshold end of the control chip, the reset end of the control chip and the power supply end of the control chip are both connected to the collector of the second transistor, the output end of the control chip is connected to the first end of the sixth resistor, the second end of the sixth resistor is connected to the base of the third transistor, the collector of the third transistor is connected to the indicator light, and the emitter of the third transistor is grounded.

[0015] Preferably, the second switch is a fourth transistor, and the second driving circuit also includes: a seventh resistor, a first end of the seventh resistor is connected to the output end of the pyroelectric human body sensing module, a second end of the seventh resistor is connected to the base of the fourth transistor, and the collector of the fourth transistor and the emitter of the fourth transistor are respectively connected to the positive trigger end and the negative trigger end of the voice alarm module.

[0016] Preferably, it also includes: a DC voltage stabilizing circuit, the input end of the DC voltage stabilizing circuit is connected to the self-locking switch, and the output end of the DC voltage stabilizing circuit is connected to the power supply end of the voice alarm module.

[0017] Preferably, there are three indicator lights which are connected in series in sequence, and also include a shell, the surface of the shell is provided with six through holes, the self-locking switch is arranged in the first through hole, the three indicator lights are arranged in the second through hole, the third through hole and the fourth through hole, respectively, the pyroelectric human body sensing module is arranged in the fifth through hole, and the voice alarm module is arranged in the sixth through hole.

[0018] Preferably, the shell is a square shell, the three indicator lights are respectively located on two side surfaces and a front surface of the shell, and the self-locking switch is located on the top surface of the shell.

[0019] Preferably, there are three pyroelectric human body sensing modules, which are respectively located on the two side surfaces and the front of the housing, and also include a selection switch corresponding to each pyroelectric human body sensing module, and the selection switch is arranged between the power supply end of the pyroelectric human body sensing module and the self-locking switch.

[0020] Preferably, the three pyroelectric human body sensing modules are located at different heights.

[0021] Preferably, the power source of the pyroelectric human body sensing module, the voice alarm module and the indicator light is a lithium battery pack.

[0022] The power outage sign provided by the utility model controls the power supply of all electrical components to be turned on through a self-locking switch, and can automatically sense the human body approaching signal through a pyroelectric human body sensing module. After sensing the signal, a driving signal is output to the first driving circuit and the second driving circuit. After the first driving circuit receives the driving signal, the first switch is closed to generate an oscillating driving signal, so that the indicator light can be extinguished and lit periodically, forming a flashing state, thereby playing a better prompting role. After the second driving circuit receives the driving signal, the second switch is closed, so that the voice alarm module starts to issue a voice prompt. It can be seen that, compared with the static prompting method of the prior art, the power outage sign provided by this embodiment is a dynamic prompting method, and the oscillating driving signal has a better prompting effect than the single level method, which greatly guarantees the safety of electrical construction personnel. In addition, the self-locking switch can reduce the number of operations, which is quick and efficient. Finally, the voice alarm prompt and the indicator light prompt are combined to achieve a better prompting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present utility model, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1A circuit diagram of a power outage indicator provided by an embodiment of the utility model;

[0025] Figure 2 A front view of a housing of a power outage indicator provided by an embodiment of the utility model;

[0026] Figure 3 A side view of a housing of a power outage indicator provided by an embodiment of the utility model;

[0027] The reference numerals are as follows: 1 is a pyroelectric human body sensing module, 2 is a voice alarm module, and 3 is a housing. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.

[0029] The core of the utility model is to provide a power failure indicator sign, which can be applied to various occasions where closing the switch after power failure is required.

[0030] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] Figure 1 The following is a circuit diagram of a power outage indicator provided by an embodiment of the utility model. Figure 1 As shown, the power outage sign includes: a pyroelectric human body sensing module 1, a voice alarm module 2, indicator lights (D1, D2 and D3), a first drive circuit for outputting an oscillation drive signal, a second drive circuit and a self-locking switch SBS, the first drive circuit and the second drive circuit respectively include a first switch and a second switch.

[0032] One end of the self-locking switch SBS is connected to the battery pack, and the other end is connected to the pyroelectric human body sensing module 1 and the voice alarm module 2 respectively.

[0033] The pyroelectric human body sensing module 1 is used to detect a biological body approaching signal and output a driving signal when a biological body approaching signal is detected.

[0034] The first driving circuit is connected to the pyroelectric human body sensing module 1, and is used to control the first switch to close when receiving a driving signal to generate an oscillating driving signal to turn on or off the indicator light;

[0035] The second driving circuit is connected to the pyroelectric human body sensing module 1 and is used to control the second switch to close to turn on the voice alarm module 2 when receiving a driving signal.

[0036] Electrical operations in factories and mines have strict safety and quality operation procedures, the purpose of which is to ensure the safety of electrical construction. If the operation is wrong, it is easy to cause accidents such as electric shock, electrical fire, and damage to electrical equipment, so "safe use of electricity is a matter of life and death". The safety regulations have strict requirements for the shutdown of electrical equipment, and implement a power outage sign (someone is working, it is forbidden to close the switch) and a power-on sign removal system. This kind of power outage sign is a static warning. If the hanging position is unreasonable, it may not be seen, which poses a great safety risk. In addition, it needs to be hung and removed by operation and maintenance personnel, which is not smart enough. Therefore, in this embodiment, the pyroelectric human body sensing module 1 is used to automatically sense the approach of the human body and send out a driving signal, thereby driving the voice alarm module and the indicator light to work, which is a dynamic warning.

[0037] The pyroelectric human body sensing module 1 is a technology that uses the pyroelectric effect to detect human or animal activities. This module is usually a human pyroelectric motion sensor based on the pyroelectric effect, which can detect infrared rays emitted by humans or animals. The module can adjust the detection range and delay time, and can select single trigger or repeated trigger mode through a jumper. Specifically, it has a fully automatic sensing function, outputs a high level when a person enters the sensing range, and delays the high level to turn off after leaving, and outputs a low level. It also has a photosensitive control, which can be set to not sense during the day or when the light is strong. In addition, its trigger mode: you can choose a non-repeatable trigger or a repeatable trigger mode. In the specific implementation, the module can use a dual-element probe, and the sensing range and sensitivity will vary depending on the direction of human movement.

[0038] As an inductive element, the pyroelectric human body sensing module 1 is the main component for outputting detection signals. When it senses a signal, it outputs a driving signal to the first driving circuit and the second driving circuit. The first switch in the first driving circuit is closed, so that the first driving circuit can generate an oscillating driving signal to turn on or off the indicator light. The reason for using a vibration driving signal is to make the indicator light flash, which has a better reminder effect than the normally on warning method. It is understandable that the frequency of the oscillating driving signal can be set according to actual conditions, and this embodiment is not limited thereto. After receiving the driving signal, the second switch of the second driving circuit is also closed, so that the voice alarm module is started and a voice prompt is issued, such as a prompt tone of "someone is working, do not close the switch".

[0039] It is understandable that in this embodiment, the number of indicator lights is not limited. Figure 1 In the embodiment, there are three indicator lights, but the number is not limited to three and can be determined according to actual conditions.

[0040] In specific implementation, the self-locking switch SBS is a special type of switch that has a built-in locking mechanism that allows the switch to maintain its state after being operated once until it is operated again. This switch is used in electronic and electrical equipment to control the on and off state of the circuit and prevent accidental disconnection or shutdown. The purpose of adding a self-locking switch SBS is to enable staff to disconnect all circuit components of the entire power outage sign when it is not in use, without generating power consumption. When in use, triggering the self-locking switch once will connect all circuits, and this working state can be locked without having to operate it again.

[0041] During electrical construction, the electrician disconnects the power switch of the equipment to stop supplying power to the equipment, and then hangs the power outage sign provided by this embodiment on the power switch of the equipment. When someone approaches the switch, a prompt tone of "someone is working, do not close the switch" is emitted, and the warning light emitting diode flashes to alarm.

[0042] The power outage sign provided in this embodiment controls the power supply of all electrical components to be turned on through a self-locking switch, and can automatically sense the human body approaching signal through a pyroelectric human body sensing module. After sensing the signal, a driving signal is output to the first driving circuit and the second driving circuit. After the first driving circuit receives the driving signal, the first switch is closed to generate an oscillating driving signal, so that the indicator light can be extinguished and lit periodically, forming a flashing state, thereby playing a better prompting role. After the second driving circuit receives the driving signal, the second switch is closed, so that the voice alarm module starts to issue a voice prompt. It can be seen that, compared with the static prompting method of the prior art, the power outage sign provided in this embodiment is a dynamic prompting method, and the oscillating driving signal has a better prompting effect than the single level method, which greatly guarantees the safety of electrical construction personnel. In addition, the self-locking switch can reduce the number of operations, which is quick and efficient. Finally, the voice alarm prompt and the indicator light prompt are combined to achieve a better prompting effect.

[0043] Furthermore, the first switch is a first transistor T1, and the first driving circuit further includes a first resistor R1, a second resistor R2, a fifth resistor R5, a second transistor T2 and a timer circuit.

[0044] The first end of the first resistor R1 is connected to the output end (OUT) of the pyroelectric human body sensing module 1, the second end of the first resistor R1 is connected to the base of the first transistor T1, the collector of the first transistor T1 is connected to the first end of the second resistor R2, the emitter of the first transistor T1 is grounded, the second end of the second resistor R2 is connected to the base of the second transistor T2, the emitter of the second transistor T2 is connected to the power supply end of the pyroelectric human body sensing module 1, the collector of the second transistor T2 is connected in series with the fifth resistor R5 and the indicator light, and the other end of the indicator light is grounded through the timer circuit.

[0045] In this embodiment, Figure 1 As shown, when the pyroelectric human body sensing module 1 senses a human body signal, the output terminal OUT outputs a high level of about 3.3V, and the alarm LED light flashing circuit is connected through the first resistor R1, the first transistor T1, and the second transistor T2 to issue a light warning. The human body sensing distance and the output signal time length are adjustable. It can be seen that the electronic components used in the first drive circuit are low-priced and easy to implement.

[0046] On this basis, if Figure 1 As shown, the timer circuit includes: a third resistor R3, a fourth resistor R4, a sixth resistor R6, a capacitor C1, a diode D4, a control chip U1 and a third transistor T3. The fourth resistor R4 is a sliding rheostat.

[0047] A first end of the third resistor R3 is connected to the collector of the second triode T2, a second end of the third resistor R3 is respectively connected to a first fixed end of a fourth resistor R4, an anode of a diode D4, and a discharge end DIS of a control chip U1, a second fixed end of the fourth resistor R4 and a moving end of the fourth resistor R4 are both connected to a first end of a capacitor C1, a cathode of a diode D4, a low trigger end TRIG of a control chip U1, and a threshold end THR of a control chip U1, a reset end R of the control chip U1 and a power supply end VCC of the control chip U1 are both connected to the collector of the second triode T2, an output end of the control chip U1 is connected to a first end of a sixth resistor R6, a second end of the sixth resistor R6 is connected to a base of a third triode T3, a collector of the third triode T3 is connected to an indicator light, and an emitter of the third triode T3 is grounded.

[0048] like Figure 1As shown, the control chip U1 is based on the LM555 integrated circuit, and generates an oscillating signal output through the cooperation of peripheral resistors and capacitors to drive the indicator light to flash. When the human body sensing probe senses the human body signal, the signal output terminal OUT outputs a high level of about 3.3V, and the power supply of the circuit where the indicator light is located is turned on through the first resistor R1, the first transistor T1, and the second transistor T2. The power supply charges the capacitor C1 through the third resistor R3 and the diode D4. The capacitor C1 is connected to the 6th and 2nd pins of the LM555. These two pins are respectively the high trigger end and the low trigger end. When the voltage of the capacitor C1 is charged to 2 / 3 of the power supply voltage, the high level of the output end of the 3rd pin is driven to light up the D1, D2, and D3 light-emitting diodes through the sixth resistor R6 and the third transistor T3. At this time, the discharge end of the 7th pin is low level, and the capacitor C1 is discharged to the ground through the fourth resistor R4 and the 7th pin. When the voltage on the capacitor C1 is reduced to 1 / 3 of the power supply voltage, the 3rd pin outputs a low level, and D1, D2, and D3 are extinguished. At the same time, the internal transistor of the 7th pin is cut off and stops discharging. The circuit charges the capacitor C1 through the third resistor R3 and the diode D4. The oscillation signal is generated repeatedly until the human body sensing probe no longer senses the human body signal.

[0049] like Figure 1 As shown, the second switch is a fourth transistor T4, and the second driving circuit also includes: a seventh resistor R7, a first end of the seventh resistor R7 is connected to the output end of the pyroelectric human body sensing module 1, a second end of the seventh resistor R7 is connected to the base of the fourth transistor T4, and the collector of the fourth transistor T4 and the emitter of the fourth transistor T4 are respectively connected to the positive trigger end and the negative trigger end of the voice alarm module 2.

[0050] The working principle is: when the sensing probe of the pyroelectric human body sensing module 1 senses a human body signal, the signal output terminal OUT outputs a high level of about 3.3V, which triggers the voice alarm module 2 through the seventh resistor R7 and the fourth transistor T4. The voice alarm amplifier module 2 has a voice input unit and a voice output amplification unit to drive the speaker. If it receives a trigger signal output by the human body sensing module, it will play the recorded warning voice.

[0051] On the basis of the above embodiment, it further comprises: a DC voltage stabilizing circuit WY, the input end of the DC voltage stabilizing circuit WY is connected to the self-locking switch SBS, and the output end of the DC voltage stabilizing circuit WY is connected to the power supply end of the voice alarm module 2.

[0052] The DC voltage regulator circuit WY is an integrated circuit for converting unstable DC voltage into stable DC voltage, which is widely used in electronic devices to ensure the stable operation of the circuit. The advantages of the DC voltage regulator circuit WY include large output power and wide adaptability, and due to the use of integrated technology, they are small in size and highly reliable. In addition, the DC voltage regulator circuit WY needs to consider the selection of current limiting resistors to ensure that the voltage regulator tube operates within a safe parameter range, and the design of the filter circuit must be considered to obtain better voltage stability and ripple performance. It is usually divided into two categories: linear integrated voltage regulators and switch integrated voltage regulators. Linear integrated voltage regulators can be further subdivided into low-voltage difference integrated voltage regulators and general voltage difference integrated voltage regulators, while switch integrated voltage regulators include buck-type, boost-type, and integrated voltage regulators with opposite input and output polarities. This embodiment does not limit the type of DC voltage regulator circuit WY. In a specific embodiment, the DC voltage regulator circuit WY is a DC 5V voltage regulator integrated circuit LM7805, which provides a DC 5V power supply for the voice alarm module 2.

[0053] like Figure 1 As shown, there are three indicator lights connected in series. The power outage indicator also includes a shell 3, and six through holes are opened on the surface of the shell 3. The self-locking switch SBS is set in the first through hole, and the three indicator lights are respectively set in the second through hole, the third through hole and the fourth through hole. The pyroelectric human body sensing module 1 is set in the fifth through hole, and the voice alarm module 2 is set in the sixth through hole.

[0054] In a specific implementation, the housing 3 can be an ABS plastic waterproof sealed box, for example, with a size of 115×90×55. For ease of use, a handle can be provided on the housing 3, which can be provided on the top surface of the housing for easy carrying, or can be hung on other hooks when in use.

[0055] Figure 2 A front view of a housing of a power outage indicator sign provided in an embodiment of the utility model. Figure 3 A side view of the housing of a power outage indicator provided by an embodiment of the utility model. Figure 2 and 3 As shown, the housing 3 is a square housing, three indicator lights are respectively located on two side surfaces and a front surface of the housing 3 , and a self-locking switch SBS is located on the top surface of the housing 3 .

[0056] Since people may stand at different positions of the power outage sign, in order to better remind users, indicator lights are distributed on different sides of the shell, so that people can see the flashing of the indicator lights no matter what angle they stand.

[0057] Furthermore, there are three pyroelectric human body sensing modules 1, which are respectively located on the two side surfaces and the front of the housing, and also include a selection switch corresponding to each pyroelectric human body sensing module 1, which is arranged between the power supply end of the pyroelectric human body sensing module 1 and the self-locking switch SBS.

[0058] It is understandable that human bodies are of different heights, so in order to more accurately sense users of different heights, there are three pyroelectric human body sensing modules, and they are located at different heights. In addition, considering that in some scenarios, the power outage sign is placed at a low position, and the height of the user can usually be sensed, so in order to save energy, a selection switch is provided, and the selection switch can control which pyroelectric human body sensing module 1 is put into use.

[0059] Taking into account the changing power outage scenarios, in this embodiment, the power source of the pyroelectric human body sensing module 1, the voice alarm module 2 and the indicator light is a lithium battery pack.

[0060] The power supply of the lithium battery pack makes the power outage sign independent of external power supply, easy to carry, and can be charged and used repeatedly. Specifically, the lithium battery pack is 12V, with a capacity of 2800mAh, and supplies power to the entire circuit through the self-locking switch SBS.

[0061] The power outage sign provided by the utility model is introduced in detail above. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

[0062] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

Claims

1. A power outage sign, characterized in that: include: A pyroelectric human body sensing module, a voice alarm module, an indicator light, a first drive circuit for outputting an oscillation drive signal, a second drive circuit and a self-locking switch, wherein the first drive circuit and the second drive circuit respectively include a first switch and a second switch; One end of the self-locking switch is connected to the battery pack, and the other end is connected to the pyroelectric human body sensing module and the voice alarm module respectively; The pyroelectric human body sensing module is used to detect a biological body approaching signal and output a driving signal when a biological body approaching signal is detected; The first driving circuit is connected to the pyroelectric human body sensing module and is used to control the first switch to close when receiving the driving signal to generate an oscillating driving signal to turn on or off the indicator light; The second driving circuit is connected to the pyroelectric human body sensing module, and is used to control the second switch to close to turn on the voice alarm module when receiving the driving signal.

2. The power outage sign according to claim 1, characterized in that: The first switch is a first transistor, and the first driving circuit further includes a first resistor, a second resistor, a fifth resistor, a second transistor and a timer circuit; The first end of the first resistor is connected to the output end of the pyroelectric human body sensing module, the second end of the first resistor is connected to the base of the first transistor, the collector of the first transistor is connected to the first end of the second resistor, the emitter of the first transistor is grounded, the second end of the second resistor is connected to the base of the second transistor, the emitter of the second transistor is connected to the power supply end of the pyroelectric human body sensing module, the collector of the second transistor is connected in series with the fifth resistor and the indicator light in sequence, and the other end of the indicator light is grounded through the timer circuit.

3. The power outage sign according to claim 2, characterized in that: The timer circuit comprises: a third resistor, a fourth resistor, a sixth resistor, a capacitor, a diode, a control chip and a third triode; the fourth resistor is a sliding rheostat; The first end of the third resistor is connected to the collector of the second transistor, the second end of the third resistor is respectively connected to the first fixed end of the fourth resistor, the anode of the diode, and the discharge end of the control chip, the second fixed end of the fourth resistor and the moving end of the fourth resistor are both connected to the first end of the capacitor, the cathode of the diode, the low trigger end of the control chip and the threshold end of the control chip, the reset end of the control chip and the power supply end of the control chip are both connected to the collector of the second transistor, the output end of the control chip is connected to the first end of the sixth resistor, the second end of the sixth resistor is connected to the base of the third transistor, the collector of the third transistor is connected to the indicator light, and the emitter of the third transistor is grounded.

4. The power outage sign according to claim 1, characterized in that: The second switch is a fourth transistor, and the second driving circuit also includes: a seventh resistor, a first end of the seventh resistor is connected to the output end of the pyroelectric human body sensing module, a second end of the seventh resistor is connected to the base of the fourth transistor, and the collector and the emitter of the fourth transistor are respectively connected to the positive trigger end and the negative trigger end of the voice alarm module.

5. The power outage sign according to any one of claims 1 to 4, characterized in that: Also includes: A DC voltage stabilizing circuit, wherein the input end of the DC voltage stabilizing circuit is connected to the self-locking switch, and the output end of the DC voltage stabilizing circuit is connected to the power supply end of the voice alarm module.

6. The power outage sign according to claim 1, characterized in that: There are three indicator lights which are connected in series in sequence, and also include a shell. Six through holes are opened on the surface of the shell. The self-locking switch is arranged in the first through hole, and the three indicator lights are arranged in the second through hole, the third through hole and the fourth through hole respectively. The pyroelectric human body sensing module is arranged in the fifth through hole, and the voice alarm module is arranged in the sixth through hole.

7. The power outage sign according to claim 6, characterized in that: The shell is a square shell, the three indicator lights are respectively located on the two side surfaces and the front surface of the shell, and the self-locking switch is located on the top surface of the shell.

8. The power outage sign according to claim 7, characterized in that: There are three pyroelectric human body sensing modules, which are respectively located on the two side surfaces and the front of the housing, and also include a selection switch corresponding to each pyroelectric human body sensing module. The selection switch is arranged between the power supply end of the pyroelectric human body sensing module and the self-locking switch.

9. The power outage sign according to claim 8, characterized in that: The three pyroelectric human body sensing modules are located at different heights respectively.

10. The power outage indicator according to claim 1, characterized in that: The power source of the pyroelectric human body sensing module, the voice alarm module and the indicator light is a lithium battery pack.

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