CN220976172U

CN220976172U - Elevator authority control device based on face recognition

Info

Publication number: CN220976172U
Application number: CN202322746478.6U
Authority: CN
Inventors: 王飞飞; 汪燕青; 张兵; 陈亮彬; 刘雪松; 蒋志凯; 林陆益; 谷雨; 李毅康
Original assignee: Xiamen Road & Bridge Information Co ltd
Current assignee: Xiamen Road & Bridge Information Co ltd
Priority date: 2023-10-13
Filing date: 2023-10-13
Publication date: 2024-05-17
Anticipated expiration: 2033-10-13

Abstract

The utility model provides a lifter authority control device based on face recognition, which comprises a power supply module, a face recognition module and an authority control module, wherein the power supply module is connected with the authority control module, and the authority control module is electrically connected with the face recognition module; the right control module comprises a main control circuit and a two-gear self-locking selection change-over switch, the main control circuit comprises a main control chip and a relay, and the main control chip is electrically connected with the two-gear self-locking selection change-over switch, the face recognition module and the relay; the relay is used for being electrically connected with the operation desk. According to the utility model, the control of the operation authority of the operation table is started through the unique authentication of the face, so that the phenomenon that a non-professional person operates the construction elevator in a violation manner when the professional operator is not in the operation table in the traditional mode is effectively avoided.

Description

Elevator authority control device based on face recognition

Technical Field

The utility model relates to the technical field of digital circuits, in particular to a lifter authority control device based on face recognition.

Background

The phenomenon that non-professional personnel at the construction site operate the construction hoist at will is common unsafe behavior at the construction site, and serious accidents and injuries can be caused. These non-professionals may be other construction workers, visitors, or other persons who do not receive the relevant training and qualification certification. They may not know or ignore the safety regulations and operating procedures for operating the construction hoist.

These non-professionals may present significant safety hazards and risks to the job site when the construction hoist is operated at will. Non-professionals operating the construction hoist at will can cause falls, collisions, electric shocks and other serious accidents to occur, causing casualties, property loss and legal liabilities.

Disclosure of utility model

In order to solve the problems in the prior art, the utility model provides a lifter authority control device based on face recognition, which can control the authority of a construction lifter, thereby improving the operation safety of the construction lifter.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

In a first aspect, the utility model provides a lifter right control device based on face recognition, which comprises a power module, a face recognition module and a right control module, wherein the power module is connected with the right control module, and the right control module is electrically connected with the face recognition module;

The right control module comprises a main control circuit and a two-gear self-locking selection change-over switch, the main control circuit comprises a main control chip and a relay, and the main control chip is electrically connected with the two-gear self-locking selection change-over switch, the face recognition module and the relay;

the relay is used for being electrically connected with the operation desk.

The utility model has the beneficial effects that: because the two-gear key switch is connected with the relay in parallel and is respectively used for being electrically connected with the operation desk, the function of the electric switch circuit is normal, the two-gear self-locking selection change-over switch is kept in a normally-closed state, the two-gear key switch is kept in a normally-open state, face images of professional operators of the construction lifter are collected and issued in advance, face recognition is carried out on the operators by utilizing the face recognition module before the construction lifter is operated, door opening and closing signals are transmitted to the right control module after the face recognition is passed, the relay is controlled to take effect and keep a passage state by a main control chip of the right control module, an operation circuit passage in the operation desk is enabled, and the operators can operate the construction lifter through the operation desk. Therefore, the utility model can effectively avoid the phenomenon that the non-professional staff illegally operates the construction lifter when the professional operator is not on the operation desk in the traditional mode by only authenticating the control of the operation authority of the operation desk through the face.

Optionally, the permission control module further comprises a two-gear key switch, wherein the two-gear key switch is connected with the relay in parallel and is used for being electrically connected with the operation console.

According to the description, when the function of the electric appliance switching circuit is faulty, the two keys connected in parallel are used for controlling the on-off of the operation circuit in the operation table, and the key is used for switching the operation circuit, so that the phenomenon that a professional operator does not operate the construction hoist illegally when the professional operator is not on the operation table in the traditional mode can be avoided, and the safety control of the construction hoist can be realized when the circuit is faulty.

Optionally, the main control circuit comprises a delay latch circuit, a driving circuit and a voltage stabilizing circuit, wherein the delay latch circuit comprises a main control chip, and the driving circuit comprises a relay;

The input end of the voltage stabilizing circuit is electrically connected with the power module, the output end of the voltage stabilizing circuit is electrically connected with the delay latch circuit and the driving circuit respectively, the input end of the delay latch circuit is electrically connected with the face output end of the face recognition module, and the output end of the delay latch circuit is electrically connected with the driving circuit.

As is clear from the above description, the delay latch circuit ensures the passage state of the relay, so that the electric signal can be continuously transmitted to the console, and the operation circuit in the console is turned on.

Optionally, the delay latch circuit further includes a charging capacitor, a current limiting resistor and a first MOS tube, one end of the current limiting resistor is electrically connected with the face output end of the face recognition module, the other end of the current limiting resistor is simultaneously electrically connected with one end of the charging capacitor and the gate of the first MOS tube, the other end of the charging capacitor is grounded, the drain electrode of the first MOS tube is connected with a working voltage, the source electrode of the first MOS tube is electrically connected with the latch control pin of the main control chip, the first data output end of the main control chip is electrically connected with the driving circuit, and the first data input end corresponding to the first data output end on the main control chip is connected with the working voltage;

The main control chip is a latch.

According to the above description, the charging time of the capacitor is prolonged by the current limiting resistor, the noise wave of the output signal of the face machine and other external signal interference are filtered through the delay effect of charging and discharging the charging capacitor, the latch control pin of the latch is pulled up after the face verification success signal is output, and the high-level state of the first data input end of the latch is synchronized with the first data output end after the delay time is reached, so that the output state of the relay is kept on after the face recognition success.

Optionally, the master control chip is a 74 series logic chip.

Optionally, the delay latch circuit further includes a first TVS diode and a schottky diode, the face output end of the face recognition module is electrically connected with one end of the first TVS diode and the cathode end of the schottky diode at the same time, the other end of the first TVS diode is grounded, and the anode end of the schottky diode is electrically connected with one end of the charging capacitor connected with the current limiting resistor.

As can be seen from the above description, the TVS diode is used for filtering out the instantaneous large voltage or static electricity protection, and the schottky diode is used for discharging the capacitor rapidly, so as to ensure that the accumulated charges on the discharge vessel are released rapidly when the signal output of the facial machine is unstable.

Optionally, the driving circuit further includes a second MOS tube, an output end of the delay latch circuit is electrically connected with a gate of the second MOS tube, a source electrode of the second MOS tube is grounded, a drain electrode of the second MOS tube is electrically connected with a grounding end of the relay, a power end of the relay is connected with a working voltage, and a load end of the relay is electrically connected with the operating console.

According to the description, when the high level of the delay latch circuit is given to the grid electrode of the second MOS tube, the source electrode and the drain electrode of the second MOS tube are conducted, the relay coil passes through the current, then a magnetic field is generated to attract the elastic sheet in the interior, and the output loop is conducted; on the contrary, when the grid electrode of the second MOS tube receives the low level, the second MOS tube is turned off, the relay coil is turned off, no current exists, and the output loop is turned off.

Optionally, the driving circuit further includes a light emitting diode, wherein a positive electrode of the light emitting diode is connected to the working voltage, and a negative electrode of the light emitting diode is electrically connected to a drain electrode of the second MOS tube.

As can be seen from the above description, the led is used to indicate the open/close state of the relay.

Optionally, the voltage stabilizing circuit includes a voltage stabilizing chip, an input pin of the voltage stabilizing chip is electrically connected with an output end of the power module, and an output pin of the voltage stabilizing chip outputs the working voltage.

Optionally, the voltage stabilizing circuit further includes a second TVS diode, a fuse, and an anti-reverse diode, one end of the second TVS diode and one end of the fuse are electrically connected to the output end of the power module, the other end of the second TVS diode is grounded, the other end of the fuse is electrically connected to the positive end of the anti-reverse diode, and the negative end of the anti-reverse diode is electrically connected to the input pin of the voltage stabilizing chip.

According to the description, the utility model adopts a three-stage protection circuit, which comprises reverse connection protection, overcurrent protection and instantaneous high-voltage surge protection, thereby avoiding equipment failure and damage caused by unstable voltage in the severe environment of a construction site.

Drawings

Fig. 1 is a schematic diagram of the cooperative connection between an elevator right control device based on face recognition and an elevator and an operation desk according to an embodiment of the present utility model;

FIG. 2 is a schematic circuit diagram of a delay latch circuit according to an embodiment of the present utility model;

FIG. 3 is a schematic circuit diagram of a driving circuit according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram of a voltage stabilizing circuit according to an embodiment of the present utility model;

FIG. 5 is a schematic circuit diagram of a power-on indicator circuit according to an embodiment of the present utility model;

Fig. 6 is a schematic circuit diagram of an external interface circuit according to an embodiment of the present utility model;

Fig. 7 is a flowchart of the operation of the elevator right control device based on face recognition according to the embodiment of the present utility model;

[ reference numerals description ]

1. An elevator authority control device;

11. A power module; 12. a face recognition module; 13. a main control circuit; 14. two-gear self-locking selection change-over switch; 15. a two-gear key switch;

100. A construction elevator; 200. an operating table.

Detailed Description

In order that the above-described aspects may be better understood, exemplary embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.

Example 1

Referring to fig. 1 to 6, the present embodiment provides a control device for elevator authority based on face recognition, which is located beside an operation table 200 of a construction elevator 100 and is a loop of an operation table control circuit.

The elevator authority control device 1 comprises a power module 11, a face recognition module 12 and an authority control module, wherein the power module 11 is connected with the authority control module, and the authority control module is electrically connected with the face recognition module 12.

In this embodiment, the authority control module includes a main control circuit 13, a two-gear self-locking selection switch 14 and a two-gear key switch 15, the main control circuit 13 includes a main control chip U1 and a relay RLY1, and the main control chip U1 is electrically connected with the two-gear self-locking selection switch 14, the face recognition module 12 and the relay RLY 1; relay RLY1 is used for electrically connecting with console 200, and two-stage key switch 15 is connected in parallel with relay RLY1 and is used for electrically connecting with console 200.

As shown IN fig. 1, the main control circuit 13 includes a delay latch circuit, a driving circuit and a voltage stabilizing circuit, wherein an input end of the voltage stabilizing circuit is electrically connected with the power module 11, an output end of the voltage stabilizing circuit is respectively electrically connected with the delay latch circuit and the driving circuit, an input end of the delay latch circuit is electrically connected with a face output end le_in of the face recognition module 12, and an output end of the delay latch circuit is electrically connected with the driving circuit.

As shown IN fig. 2, the delay latch circuit includes a main control chip U1, a charging capacitor C3, a current limiting resistor R8, a first MOS transistor Q1, a first TVS diode D1 and a schottky diode D2, a face output le_in of the face recognition module 12 is electrically connected to one end of the first TVS diode D1, a negative end of the schottky diode D2 and one end of the current limiting resistor R8 at the same time, the other end of the first TVS diode D1 is grounded, a positive end of the schottky diode D2 is electrically connected to one end of the charging capacitor C3, the other end of the current limiting resistor R8 and a gate of the first MOS transistor Q1, the other end of the charging capacitor C3 is grounded, a drain of the first MOS transistor Q1 is connected to an operating voltage, a source of the first MOS transistor Q1 is electrically connected to a latch control pin LE of the main control chip U1, a first data output Q0 of the main control chip U1 is electrically connected to a driving circuit, and a first data input D0 corresponding to the first data output Q0 on the main control chip U1 is connected to an operating voltage.

The main control chip U1 is a latch, specifically, the main control chip U1 is a 74-series logic chip, for example, a 74HC573PW type used in the embodiment includes eight paths of 3-state output non-inverting transparent latches, where the data output ends Q0 to Q7 respectively correspond to the data input ends D0 to D7, so as to form eight paths of 3-state output.

As shown in fig. 2, the delay latch circuit further includes the following peripheral circuits: resistor R1 and capacitor C5 connected to latch control pin LE of main control chip U1, capacitor C1 and capacitor C9 connected to power pin of main control chip U1, resistor R2 and capacitor C4 connected to enable pin OE of main control chip U1, resistor R6 connected to first data output end Q0 of main control chip U1, and resistor R5 and resistor R7 connected to drain of first MOS transistor Q1.

The TVS diode is used for filtering out instantaneous large voltage or static protection, the schottky diode D2 is used for discharging the charging capacitor C3 rapidly, so as to ensure that accumulated charges on the charging capacitor C3 are released rapidly when the signal output of the face machine is unstable, the charging time of the charging capacitor C3 is prolonged by the current limiting resistor R8, the noise and other external signal interference of the face machine are filtered through the delay effect of charging and discharging the charging capacitor C3, the latch control pin of the latch is pulled up after the successful signal output of the face verification is delayed, and the high level state of the first data input end D0 of the latch is synchronized with the first data output end Q0 after the delay time is reached, so that the output state of the relay rliy 1 is kept on after the face recognition is successful.

As shown in fig. 3, the driving circuit further includes a relay RLY1, a second MOS transistor Q2, and a light emitting diode RUN1, the first data output terminal Q0 of the delay latch circuit is electrically connected to the gate of the second MOS transistor Q2, the source of the second MOS transistor Q2 is grounded, the drain is electrically connected to the ground terminal of the relay RLY1, the power terminal of the relay RLY1 is connected to the working voltage, the load terminals NO and COM of the relay RLY1 are electrically connected to the console 200, the positive terminal of the light emitting diode RUN1 is connected to the working voltage, and the negative terminal is electrically connected to the drain of the second MOS transistor Q2.

As shown in fig. 3, the driving circuit further includes the following peripheral circuits: the resistors R3 and R4 connected between the first data output terminal Q0 and the gate of the second MOS transistor Q2, the diode D3 connected between the power terminal and the ground terminal of the relay RLY1, and the resistor R9 connected in series with the light emitting diode RUN 1.

When the high level of the delay latch circuit is given to the grid electrode of the second MOS tube Q2, the source electrode and the drain electrode of the second MOS tube Q2 are conducted, the coil of the relay RLY1 passes through the current, then a magnetic field is generated to attract an internal spring sheet, and the output loop is conducted; conversely, when the gate of the second MOS transistor Q2 receives the low level, the second MOS transistor Q2 is turned off, the relay rliy 1 coil is turned off, no current is flowing, and the output loop is turned off. The open/close state of the relay RLY1 is confirmed by the light emitting diode RUN 1.

As shown in fig. 4, the voltage stabilizing circuit includes a voltage stabilizing chip U2, a second TVS diode D4, a fuse F1, and an anti-reverse diode D5, wherein one end of the second TVS diode D4 and one end of the fuse F1 are electrically connected to the output VCC of the power module 11, the other end of the second TVS diode D4 is grounded, the other end of the fuse F1 is electrically connected to the positive end of the anti-reverse diode D5, the negative end of the anti-reverse diode D5 is electrically connected to the input pin Vin of the voltage stabilizing chip U2, the output pin Vout of the voltage stabilizing chip U2 outputs an operating voltage, and the ground pin GND of the voltage stabilizing chip U2 is grounded.

As shown in fig. 4 and 5, the driving circuit further includes the following peripheral circuits: the capacitor C2 and the capacitor C6 are connected to the input pin Vin of the voltage stabilizing chip U2, the capacitor C2 and the capacitor C6 are connected to the output pin Vout of the voltage stabilizing chip U2, and the resistor R10 and the power-on indication circuit of the light emitting diode PWR1 are connected between the working voltage and the ground.

The three-stage protection circuit comprises reverse connection protection, overcurrent protection and instantaneous high-voltage surge protection, so that equipment faults and damages caused by unstable voltage in the severe environment of a construction site are avoided.

As shown in fig. 6, in the present embodiment, the rights control module provides a pair of external interface circuits, wherein the pin elements P1 are respectively: load terminals NO and COM of relay rliy 1, face output terminal le_in of face recognition module 12, operating voltage +5v, ground GND, and output terminal VCC of power supply module 11.

It should be noted that, the peripheral circuit of the circuit design is designed according to the corresponding chip and the component, so that the corresponding chip or the component can work normally, and the specific development is not performed in this embodiment.

In order to better illustrate the present embodiment, specific parameters of each component are provided in the present embodiment: in this embodiment, the voltage stabilizing chip U2 is CJ78M05, the output terminal VCC is +12v, the operating voltage +5v is GND, R1 and R8 are 100deg.c., R2, R3, R4, R6 and R7 are 10kΩ, R9 and R10 are 2kΩ, R5 is 0Ω, and only used for line connection, and the capacitors C1, C4, C5, C6 and C7 are 100nf, C2, C3, C8 and C9 are 10μf.

Thus, for the present embodiment, the delay time parameter of the delay latch circuit is calculated as follows:

The working voltage is 5V, the initial time voltage of the charging capacitor C3 is 0V, the time t voltage is 4.3V, r8 is 100k, and C3 is 10 μf, so the calculation formula of the delay time is as follows:

t＝R8*C3*ln[(V1-V0)/(V1-Vt)]

After substituting the above parameters, the delay time t is obtained to be about 2 seconds.

As shown in fig. 7, the working principle of the present embodiment is as follows:

Aiming at the phenomenon that a non-professional person at the construction site randomly operates the construction hoist 100, the embodiment provides three working modes by controlling the opening and closing states of the two-gear key switch 15 and the two-gear self-locking selection change-over switch 14:

1.1 off mode: both the two-stage key switch 15 and the two-stage self-locking selection switch 14 are in a normally open mode, and at this time, the entire equipment of the construction hoist 100 is in an open state, and the hoist cannot be operated by the operation table 200.

1.2 Face authentication mode: under the premise that the function of an electric appliance switch circuit is normal, the two-gear self-locking selection change-over switch 14 is kept in a normally closed state, and the two-gear key switch 15 is kept in a normally open state, face images of professional operators of the construction lifter 100 are collected and issued in advance, face recognition is carried out on the operators by using the face recognition module 12 before the construction lifter 100 is operated, a door opening and closing signal is transmitted to the permission control module after the face recognition is passed, the relay RLY1 is controlled to take effect and keep in a passage state by the main control chip U1 of the permission control module, the circuit passage is operated in the operation desk 200, and the operators can operate the construction lifter 100 through the operation desk 200.

1.3 Key control (fault mask) mode: the mode is applied to the emergency that the face recognition module 12 breaks down or the breaker breaks down, the two-gear key switch 15 and the relay RLY1 are in parallel connection, and the on-off state of the operation circuit is not in relation with the relay RLY1 under the condition that the key switch is kept normally closed, so that the limit of the face recognition and the control panel on the control authority of the elevator can be shielded; at this time, the disconnection or access of the elevator operation box operation circuit is controlled by only the two-stage key selection key switch.

In summary, in this embodiment, the control of the operation authority of the operation console 200 is started through the face unique authentication, or the on-off of the operation circuit in the operation console 200 is controlled through the two-stage key under the circuit failure, so that the phenomenon that the non-professional operator operates the construction hoist 100 illegally when the professional operator is not in the operation console 200 in the conventional mode is effectively avoided.

In the description of the present utility model, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; may be a communication between two elements or an interaction between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature is "on" or "under" a second feature, which may be in direct contact with the first and second features, or in indirect contact with the first and second features via an intervening medium. Moreover, a first feature "above," "over" and "on" a second feature may be a first feature directly above or obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is level lower than the second feature.

In the description of the present specification, the terms "one embodiment," "some embodiments," "examples," "particular examples," or "some examples," etc., refer to particular features, structures, materials, or characteristics described in connection with the embodiment or example as being included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that alterations, modifications, substitutions and variations may be made in the above embodiments by those skilled in the art within the scope of the utility model.

Claims

1. The elevator authority control device based on face recognition is characterized by comprising a power supply module, a face recognition module and an authority control module, wherein the power supply module is connected with the authority control module, and the authority control module is electrically connected with the face recognition module;

the relay is used for being electrically connected with the operation desk.

2. The face recognition-based elevator entitlement control device of claim 1, wherein the entitlement control module further comprises a two-speed key switch, the two-speed key switch being connected in parallel with the relay and configured to be electrically connected to an operator station.

3. The face recognition-based elevator entitlement control device as recited in claim 1, wherein the master control circuit comprises a delay latch circuit, a driving circuit and a voltage stabilizing circuit, the delay latch circuit comprises a master control chip, and the driving circuit comprises a relay;

4. The lifter authority control device based on face recognition according to claim 3, wherein the delay latch circuit further comprises a charging capacitor, a current limiting resistor and a first MOS tube, one end of the current limiting resistor is electrically connected with a face output end of the face recognition module, the other end of the current limiting resistor is simultaneously electrically connected with one end of the charging capacitor and a grid electrode of the first MOS tube, the other end of the charging capacitor is grounded, a drain electrode of the first MOS tube is connected with a working voltage, a source electrode of the first MOS tube is electrically connected with a latch control pin of the main control chip, a first data output end of the main control chip is electrically connected with the driving circuit, and a first data input end, corresponding to the first data output end, of the main control chip is connected with the working voltage;

The main control chip is a latch.

5. The face recognition-based elevator entitlement control device of claim 4 wherein the master control chip is a 74-series logic chip.

6. The elevator right control device based on face recognition according to claim 4, wherein the delay latch circuit further comprises a first TVS diode and a schottky diode, the face output end of the face recognition module is electrically connected with one end of the first TVS diode and the negative end of the schottky diode at the same time, the other end of the first TVS diode is grounded, and the positive end of the schottky diode is electrically connected with one end of the charging capacitor, which is connected with a current limiting resistor.

7. The face recognition-based elevator entitlement control device according to claim 3, wherein the driving circuit further comprises a second MOS tube, an output end of the delay latch circuit is electrically connected with a gate electrode of the second MOS tube, a source electrode of the second MOS tube is grounded, a drain electrode of the second MOS tube is electrically connected with a grounding end of the relay, a power end of the relay is connected with an operating voltage, and a load end of the relay is electrically connected with the operating console.

8. The face recognition-based elevator entitlement control device of claim 7, wherein the driving circuit further comprises a light emitting diode, wherein a positive terminal of the light emitting diode is connected to an operating voltage, and a negative terminal of the light emitting diode is electrically connected to a drain of the second MOS transistor.

9. The face recognition-based elevator entitlement control device of claim 3, wherein the voltage stabilizing circuit comprises a voltage stabilizing chip, an input pin of the voltage stabilizing chip is electrically connected with the output end of the power module, and an output pin of the voltage stabilizing chip outputs an operating voltage.

10. The face recognition-based elevator entitlement control device as recited in claim 9, wherein the voltage stabilizing circuit further comprises a second TVS diode, a fuse and an anti-reverse diode, wherein one end of the second TVS diode and one end of the fuse are electrically connected with the output end of the power module, the other end of the second TVS diode is grounded, the other end of the fuse is electrically connected with the positive end of the anti-reverse diode, and the negative end of the anti-reverse diode is electrically connected with the input pin of the voltage stabilizing chip.