CN215729345U

CN215729345U - Control circuit of intelligent household vacuum sealing machine

Info

Publication number: CN215729345U
Application number: CN202121187949.9U
Authority: CN
Inventors: 丁立者
Original assignee: Cixi Shangxin Electronic Technology Co ltd
Current assignee: Cixi Shangxin Electronic Technology Co ltd
Priority date: 2021-05-31
Filing date: 2021-05-31
Publication date: 2022-02-01
Anticipated expiration: 2031-05-31

Abstract

The utility model discloses a control circuit of an intelligent household vacuum sealing machine, which comprises a sealing machine control module and a sealing machine switch control module which are mutually and electrically connected, wherein the sealing machine control module comprises a PTC heating module, a vacuumizing motor operation module, an MCU control module, an air pressure detection circuit and a C/DC power supply module which are independently arranged, the MCU control module comprises a single chip microcomputer and a peripheral circuit, an anti-surge protection circuit is connected between a rectifier bridge DB1 and a mains supply, the anti-surge protection circuit comprises a thermistor connected on a 220VAC input port and a 4A fuse arranged on a mains supply live wire, the AC/DC power supply module comprises a rectifier bridge stack connected with a mains supply, an AC/DC power supply voltage stabilizing chip, a transformer and a Schottky diode, and a voltage stabilizing protection circuit is connected between the output of the AC/DC power supply voltage stabilizing chip and the primary side of the transformer. The structure circuit is simple and is safer to use.

Description

Control circuit of intelligent household vacuum sealing machine

Technical Field

The utility model relates to the technical field of control circuits, in particular to a control circuit of an intelligent household vacuum sealing machine.

Background

At present, refrigerators exist in many families, but in some cases, the refrigerators do not have too long time for preserving food, and if the food is preserved by a vacuum bag, the food is stored in the refrigerator and can be preserved for a longer time, and in this case, many people can consider purchasing household sealing machines.

The household sealing machine in the market uses a full-automatic filling sealing machine which is divided into a hand-pressing sealing machine and a vacuum sealing machine according to the sealing mode. The hand-press sealing machine only seals plastic bags and tin paper bags. The vacuum sealing machine firstly pumps air in a bag and then seals the bag in a vacuum state, the most main part of the vacuum sealing machine is a circuit control part, the quality of the circuit control part directly influences the final service life and the safety of a product, but the circuit control part of the existing vacuum sealing machine has the following problems: 1. the heating and vacuumizing of the existing vacuum sealing machine are integrated and synchronously arranged, so that the heating time is fixed, the setting according to the user requirement cannot be finally realized, and the sealing effect is finally poor; 2. the circuit structure is complex and unsafe.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a control circuit of an intelligent household vacuum sealing machine, which aims to solve the problems of fixed heating time, complex circuit structure and unsafety in the background technology.

In order to achieve the purpose, the utility model provides the following technical scheme: a control circuit of an intelligent household vacuum sealing machine comprises a sealing machine control module and a sealing machine switch control module which are electrically connected with each other, wherein the sealing machine control module comprises a PTC heating module, a vacuumizing motor operation module, an MCU control module, an air pressure detection circuit and an AC/DC power module which provides power for each device, the MCU control module comprises a single-chip microcomputer U1 and a peripheral circuit, the model of the single-chip microcomputer U1 is BS83B12C, an anti-surge protection circuit is connected between a rectifier bridge stack DB1 and a mains supply, the anti-surge protection circuit comprises a thermistor NTC1 connected with a 220VAC input port and a 4A fuse F1 arranged on a live wire mains supply, the PTC heating module comprises a second MOS tube Q2, a second third resistor R23, a second fourth resistor R24 and a PTC heating module, a G pin of the second MOS tube Q2 is connected with an I/O port through a second fourth resistor R24, the second third resistor R23 is connected between the G pin of the second MOS transistor Q2 and the S pin of the second MOS transistor Q2, the D pin of the second MOS transistor Q2 is connected with the negative terminal H of the PTC heating block, the vacuum motor operation module comprises a fourth field effect transistor Q4, a fifth diode D5, a second resistor R21 and a twentieth resistor R20, the twentieth resistor R20 is connected between the G pin of the fourth field effect transistor Q4 and the S pin of the fourth field effect transistor Q4, the G pin of the fourth field effect transistor Q4 is connected with the other I/O port of the singlechip U1 through the second resistor R21, the D pin of the fourth field effect transistor Q4 is connected with the output end of a vacuum motor J2, the input end of the vacuum motor J2 is connected with +12V voltage by a jumper 2, the D pin of the fourth field effect transistor Q4 is connected with the D5 of the diode D/D of the DC power supply connection module and the AC rectifying bridge 1 of the DC rectifying stack 1, The output end of the rectifier bridge stack DB1 is connected with the AC/DC power supply voltage stabilizing chip U2, a voltage stabilizing protection circuit is connected between the output of the AC/DC power supply voltage stabilizing chip U2 and the primary side of the transformer T1, and the secondary side of the transformer T1 is connected with the positive end H + of the PTC heating block through the Schottky diode.

Preferably, the sealing machine switch control module comprises 6 switch keys and more than one group of LED function display lamps, the 6 switch keys are respectively a first switch control key for independently controlling the opening or closing of the PTC heating module, a selection switch button for controlling the electrification of the host machine, a second switch control key for controlling the stop of the host machine, an automatic key for controlling the automatic work of the host machine, a third switch control key for controlling the manual key of the host machine, a spot pumping key for controlling the operation module of the vacuum pumping motor to realize spot pumping, the 6 switch keys are respectively connected with an I/O port of the single chip microcomputer U1, and each group of LED function display lamps is electrically connected with the single chip microcomputer U1.

Preferably, the air pressure detection circuit comprises a vacuumizing detection bag A1, a nineteenth resistor R19 and a seventh capacitor C7, wherein a pin 1 of the vacuumizing detection bag A1 is connected with an I/O port of a singlechip U1 through the nineteenth resistor R19, a pin 2 of the vacuumizing detection bag A1 is connected with a common end of the nineteenth resistor R19 and the singlechip U1 through the seventh capacitor C7, the pin 2 of the vacuumizing detection bag A1 is further connected with a ground end GND, so that air pressure in the vacuumizing detection bag A1 during the process of detecting the vacuum in a guide pipe is detected, a low-level signal is sent out after the air pressure meets the requirement, and the singlechip U1 controls the operation module of the vacuumizing motor to stop working after receiving the signal.

Preferably, the single chip microcomputer U1 is also connected with an alarm circuit consisting of a loudspeaker and a triode.

Preferably, the AC/DC power supply voltage stabilization chip U2 is of the type CR6841S, the voltage stabilization protection circuit includes an optocoupler U11 and a first field effect transistor Q1, a first diode D1 and a fourth resistor R4 are connected in parallel between an 8 pin of the AC/DC power supply voltage stabilization chip U2 and a G pin of the first field effect transistor Q1, a third resistor R3 is connected between the G pin of the first field effect transistor Q1 and an S pin of the first field effect transistor Q1, a second resistor R2 is connected between the S pin of the first field effect transistor Q1 and a 6 pin of the AC/DC power supply voltage stabilization chip U2, a second capacitor C2 is connected between the 6 pin of the AC/DC power supply voltage stabilization chip U2 and a protection ground PGND, a fifth resistor R5 is connected between the S pin of the first field effect transistor Q1 and a protection ground PGND 9634, a D pin of the first field effect transistor Q1 is connected with a rectification bridge output terminal DB1 through a third diode D3 and a protection bridge C1, three resistors are connected in parallel to the first capacitor C1, a pin 1 of the transformer T1 is connected with a common end of the first capacitor C1 and the rectifier bridge DB1, a pin 3 of the transformer T1 is connected with a pin D of the first field effect transistor Q1, a second diode D2, a ninth resistor R9 and an electrolytic capacitor EC2 are connected in series between the

pins

5 and 6 of the transformer T1, a pin 6 of the transformer T1 is further connected with a protection ground PGND, a common end of the ninth resistor R9 and the electrolytic capacitor EC2 is connected with a power supply VDD, a pin 2 of the AC/DC power source voltage stabilization chip U2 is connected with a pin 4 of the optocoupler U11, a pin 3 and a pin 4 of the optocoupler U11 are connected with a fourth capacitor C4, a pin 1 of the optocoupler U11 is connected with a pin 2 of a schottky diode through a seventeenth resistor R17, a pin thirteen resistor R2 is connected between the pin 1 of the optocoupler U11, and a pin seventeenth resistor R695R 828653 are connected with a pin sixteenth diode R828653, A fourteenth resistor R14 and a fifteenth resistor R15 are connected in parallel between the common end of the sixteenth resistor R16 and the fifth capacitor C5 and a ground end GND, the ground end GND and a pin 2 of the optical coupler U11 are connected with a pin 2 of a parallel voltage-stabilizing integrated circuit Q3, a pin 3 of the parallel voltage-stabilizing integrated circuit Q3 is connected with the ground end GND, and a pin 3 of the parallel voltage-stabilizing integrated circuit Q3 is connected with the common end of the sixteenth resistor R16 and the fifth capacitor C5.

Compared with the prior art, the utility model has the following beneficial effects: this structure is through operating evacuation and heating function, the realization has the evacuation and heats the function of sealing alone, realize that the user can select according to self demand, product heating time adopts the singlechip to carry out intelligent control simultaneously, realize carrying out the process of heating in succession, finally can reduce heating time, ensure the safe in utilization of product, make the input power of this product can reach 110W through above-mentioned circuit design simultaneously, guarantee that heating temperature is high, finally shorten heating time, this circuit structure is simple in addition, use more safety and stability.

Drawings

Fig. 1 is a schematic circuit block diagram of a control circuit of an intelligent home vacuum sealing machine in embodiment 1;

FIG. 2 is a schematic circuit diagram of an AC/DC power supply module in embodiment 1;

FIG. 3 is a schematic circuit diagram of an operation block of the vacuum motor in embodiment 1;

FIG. 4 is a schematic circuit diagram of a PTC heating module in embodiment 1;

FIG. 5 is a schematic circuit diagram of a pressure detection circuit in embodiment 1;

FIG. 6 is a schematic circuit diagram of the MCU control module and the capper switch control module in embodiment 1;

fig. 7 is a schematic circuit diagram of the alarm circuit in embodiment 1.

In the figure: the device comprises a sealing machine control module 1, a sealing machine switch control module 2, a PTC heating module 3, a vacuumizing motor operation module 4, an MCU control module 5, an air pressure detection circuit 6, an AC/DC power supply module 7, an anti-surge protection circuit 8, a PTC heating block 9, a voltage stabilization protection circuit 10, an LED function display lamp 11, a first switch control key 12, a selection switch button 13, a second switch control key 14, an automatic key 15, a third switch control key 16, a point pumping key 17 and an alarm circuit.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1:

referring to fig. 1-7, an embodiment of the present invention is shown: a control circuit of an intelligent household vacuum sealing machine comprises a sealing machine control module 1 and a sealing machine switch control module 2 which are electrically connected with each other, wherein the sealing machine control module 1 comprises a PTC heating module 3, a vacuumizing motor operation module 4, an MCU control module 5, an air pressure detection circuit 6 and an AC/DC power module 7 which provides power for each device, the MCU control module 5 comprises a single chip microcomputer U1 with the model of BS83B12C and a peripheral circuit, the AC/DC power module 7 comprises a rectifier bridge stack DB1 connected with a mains supply, an AC/DC power voltage stabilizing chip U2, a transformer T1 and a Schottky diode, an anti-surge protection circuit 8 is connected between the rectifier bridge stack DB1 and the mains supply, the anti-surge protection circuit 8 comprises a thermistor NTC1 connected with a 220VAC input port and a 4A fuse F1 arranged on a mains supply live wire, the PTC heating module 3 comprises a second MOS tube Q2, a second third resistor R23, a second fourth resistor R24 and a PTC heating block 9, an I/O port connected with a G pin of the second MOS tube Q2 through a second fourth resistor R24, the second third resistor R23 is connected between the G pin of the second MOS tube Q2 and an S pin of the second MOS tube Q2, a D pin of the second MOS tube Q2 is connected with a negative pole end H-of the PTC heating block 9, the vacuum motor operation module 4 comprises a fourth field effect tube Q4, a fifth diode D5, a second first resistor R21 and a twentieth resistor R20, the twentieth resistor R20 is connected between a G pin of the fourth field effect tube Q4 and the S pin of the fourth MOS tube Q4, a G pin of the fourth field effect tube Q4 is connected with another I/O port of the U1 through a second resistor R21, and an output end of the fourth field effect tube Q67J 4 6 is connected with a vacuum motor J2, the input end of the vacuum-pumping motor J2 is connected with +12V voltage through a jumper JP2, the fifth diode D5 is connected between the D pins of the fourth field-effect tube Q4, the output end of the rectifier bridge stack DB1 is connected with an AC/DC power supply voltage-stabilizing chip U2, a voltage-stabilizing protection circuit 10 is connected between the output of the AC/DC power supply voltage-stabilizing chip U2 and the primary side of a transformer T1, and the secondary side of the transformer T1 is connected with the positive end H + of a PTC heating block 9 through a Schottky diode.

Preferably, the sealing machine switch control module 2 includes 6 switch keys and more than one group of LED function display lamps 11, the 6 switch keys are respectively a first switch control key 12 for independently controlling the PTC heating module 3 to be turned on or off, a selection switch button 13 for controlling the power on of the host, a second switch control key 14 for controlling the host to be stopped, an automatic key 15 for controlling the host to automatically work, a third switch control key 16 for controlling the manual key of the host, and a spot pumping key 17 for controlling the vacuum pumping motor operation module 4 to realize spot pumping, the 6 switch keys are respectively connected with an I/O port of the single chip microcomputer U1, and each group of LED function display lamps 11 is electrically connected with the single chip microcomputer U1.

Preferably, the air pressure detection circuit 6 includes a vacuum-pumping detection pack a1, a nineteenth resistor R19 and a seventh capacitor C7, wherein a pin 1 of the vacuum-pumping detection pack a1 is connected to an I/O port of the single chip microcomputer U1 through the nineteenth resistor R19, a pin 2 of the vacuum-pumping detection pack a1 is connected to a common terminal of the nineteenth resistor R19 and the single chip microcomputer U1 through the seventh capacitor C7, and the pin 2 of the vacuum-pumping detection pack a1 is further connected to a ground terminal GND, so that the air pressure of the vacuum-pumping detection pack a1 during the detection of the conduit is detected, a low-level signal is sent out when the air pressure meets a requirement, and the single chip microcomputer U1 controls the vacuum-pumping motor operation module 4 to stop working after receiving the signal.

Preferably, the single chip microcomputer U1 is also connected with an alarm circuit 18 consisting of a loudspeaker and a triode.

Preferably, the AC/DC power source regulator chip U2 is of a model CR6841S, the regulator protection circuit 10 includes an optocoupler U11 and a first fet Q1, a first diode D1 and a fourth resistor R59623 are connected in parallel between the pin 8 of the AC/DC power source regulator chip U2 and the pin G of the first fet Q1, a third resistor R3 is connected between the pin G of the first fet Q1 and the pin S of the first fet Q1, a second resistor R2 is connected between the pin S of the first fet Q1 and the pin 6 of the AC/DC power source regulator chip U2, a second capacitor C2 is connected between the pin 6 of the AC/DC power source regulator chip U2 and a protection ground, a fifth resistor R5 is connected between the pin S of the first fet Q1 and the protection ground, the pin D of the first fet 46q 48 is connected to a rectification output terminal DB 57324 of the first fet DB1 through a third diode D585 and a third diode DB, three resistors are connected in parallel to the first capacitor C1, a pin 1 of the transformer T1 is connected with a common end of the first capacitor C1 and the rectifier bridge DB1, a pin 3 of the transformer T1 is connected with a pin D of the first field effect transistor Q1, a second diode D2, a ninth resistor R9 and an electrolytic capacitor EC2 are connected in series between the

pins

The working principle is as follows:

1. preferred AC/DC part: the AC/DC power supply chip, the peripheral circuit thereof and the transformer are used for converting 220V alternating current into +12V direct current, the AC/DC power supply chip is mainly used for inputting an external input power supply, namely commercial power from a live wire or a zero wire, and has the functions of reducing and stabilizing voltage, and simultaneously has the following protection: 1. short-circuit protection: the 4A fuse tube is placed on a live wire for short-circuit protection, and a 220V circuit is cut off by fusing a fuse when extreme conditions such as short circuit occur to a product. 2. Surge protection: the NTC1 thermistor is arranged on a 220VAC input port of the product, has negative temperature characteristics, and ensures that the current at the moment of electrifying is within the design range and the working current under the normal working state can be ensured.

2. An air pressure detection section: a special air pressure detection module, namely a vacuumizing detection bag A1 is used, after a product is installed, the air pressure in the cavity is detected through the guide pipe, and a low level signal is sent out when the air pressure meets the requirement;

3. the motor operation part: the MOS tube of the patch and a combined circuit thereof are used for driving the motor to start or stop according to an electric signal sent by the singlechip U1; vacuumizing is realized;

4. PTC heating part: the +12V voltage output by the power supply is connected to the PTC heating block by using the MOS tube of the patch and a combined circuit thereof according to an electric signal sent by the singlechip U1, so that the PTC block is heated to finish sealing, and the temperature can be set according to requirements;

5. the MCU part: the singlechip U1 and a peripheral circuit thereof are used for driving and matching other parts on the product to complete the realization of all functions of the whole product;

therefore, the circuit has the following technical effects: this structure is through operating evacuation and heating function, the realization has the evacuation and heats the function of sealing alone, realize that the user can select according to self demand, product heat time adopts the singlechip to carry out intelligent control simultaneously, realize carrying out the process of heating in succession, finally can reduce heat time, ensure the safe in utilization of product, and the product can dispatch from the factory according to the weather when dispatching from the factory and set up, guarantee the customer and use, make the input power of this product can reach 110W through above-mentioned circuit design simultaneously, guarantee that heating temperature is high, finally shorten heat time, this circuit structure is simple in addition, use more safety and stability.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides a control circuit of intelligence house vacuum capper, includes capper control module (1) and capper switch control module (2) that mutual electric connection, its characterized in that: the sealing machine control module (1) comprises a PTC heating module (3), a vacuumizing motor operation module (4), an MCU control module (5), an air pressure detection circuit (6) and an AC/DC power module (7) for providing power for each device, wherein the MCU control module (5) comprises a single chip microcomputer (U1) with the model of BS83B12C and peripheral circuits, the AC/DC power module (7) comprises a rectifier bridge stack (DB 1) connected with a mains supply, an AC/DC power voltage stabilizing chip (U2), a transformer (T1) and a Schottky diode, an anti-surge protection circuit (8) is connected between the rectifier bridge stack (DB 1) and the mains supply, the anti-surge protection circuit (8) comprises a thermistor (NTC 1) connected with a 220VAC input port and a 4A fuse (F1) arranged on a live wire, the PTC heating module (3) comprises a second MOS tube (Q2), a second third resistor (R23), a second fourth resistor (R24) and a PTC heating block (9), a G pin of the second MOS tube (Q2) is connected with an I/O port through a second fourth resistor (R24), a G pin of the second MOS tube (Q2) is connected with an S pin of the second MOS tube (Q2) through the second third resistor (R23), a D pin of the second MOS tube (Q2) is connected with a negative electrode end (H-) of the PTC heating block (9), the vacuumizing motor operation module (4) comprises a fourth field effect tube (Q4), a fifth diode (D5), a second first resistor (R21) and a twentieth resistor (R20), a G pin of the fourth field effect tube (Q4) is connected with an S pin of the fourth field effect tube (Q4) through the second resistor (R638), and the other G pin of the fourth field effect tube (Q638) is connected with another single chip microcomputer (Q20) And a D pin of the fourth field effect transistor (Q4) is connected with an output end of a vacuum-pumping motor (J2), an input end of the vacuum-pumping motor (J2) is connected with a voltage of +12V through a jumper (JP 2), a fifth diode (D5) is connected between the D pins of the fourth field effect transistor (Q4), an output end of the rectifier bridge stack (DB 1) is connected with an AC/DC power supply voltage-stabilizing chip (U2), a voltage-stabilizing protection circuit (10) is connected between an output end of the AC/DC power supply voltage-stabilizing chip (U2) and a primary side of a transformer (T1), and a secondary side of the transformer (T1) is connected with a positive end (H +) of the PTC heating block (9) through a Schottky diode.

2. The control circuit of intelligent household vacuum sealing machine according to claim 1, characterized in that: the sealing machine switch control module (2) comprises 6 switch keys and more than one group of LED function display lamps (11), wherein the 6 switch keys are respectively a first switch control key (12) for independently controlling the opening or closing of the PTC heating module (3), a selection switch button (13) for controlling the electrification of the host machine, a second switch control key (14) for controlling the stop of the host machine, an automatic key (15) for controlling the automatic work of the host machine, a third switch control key (16) for controlling the manual key of the host machine, and a point pumping key (17) for controlling the operation module (4) of the vacuum pumping motor to realize point pumping, the 6 switch keys are respectively connected with an I/O port of the single chip microcomputer (U1), and each group of the LED function display lamps (11) is electrically connected with the single chip microcomputer (U1).

3. The control circuit of the intelligent household vacuum sealing machine according to claim 1 or 2, characterized in that: the air pressure detection circuit (6) comprises a vacuumizing detection bag (A1), a nineteenth resistor (R19) and a seventh capacitor (C7), wherein a pin 1 of the vacuumizing detection bag (A1) is connected with an I/O port of the single chip microcomputer (U1) through a nineteenth resistor (R19), a pin 2 of the vacuumizing detection bag (A1) is connected with a common end of the nineteenth resistor (R19) and the single chip microcomputer (U1) through a seventh capacitor (C7), a pin 2 of the vacuumizing detection bag (A1) is further connected with a grounding terminal GND, the air pressure of the vacuumizing detection bag (A1) during vacuumizing is detected by a conduit, a low-level signal is sent out when the air pressure reaches a requirement, and the single chip microcomputer (U1) receives the signal and then controls the vacuumizing motor operation module (4) to stop working.

4. The control circuit of the intelligent household vacuum sealing machine according to claim 1 or 2, characterized in that: the singlechip (U1) is also connected with an alarm circuit (18) consisting of a loudspeaker and a triode.

5. The control circuit of the intelligent household vacuum sealing machine according to claim 1 or 2, characterized in that: the AC/DC power supply voltage stabilizing chip (U2) is in a model number of CR6841S, the voltage stabilizing protection circuit (10) comprises an optical coupler (U11) and a first field-effect tube (Q1), a first diode (D1) and a fourth resistor (R4) are connected between an 8 pin of the AC/DC power supply voltage stabilizing chip (U2) and a G pin of the first field-effect tube (Q1) in parallel, a third resistor (R3) is connected between the G pin of the first field-effect tube (Q1) and an S pin of the first field-effect tube (Q1), a second resistor (R2) is connected between an S pin of the first field-effect tube (Q1) and a 6 pin of the AC/DC power supply voltage stabilizing chip (U2), a second capacitor (C2) is connected between the 6 pin of the AC/DC power supply voltage stabilizing chip (U2) and a Protection Ground (PGND), and a fifth resistor (R5) is connected between the S pin of the first field-effect tube (Q1) and the Protection Ground (PGND), a pin D of the first field effect transistor (Q1) is connected with an output end of a rectifier bridge stack (DB 1) through a third diode (D3) and a first capacitor (C1) which are connected in series, three resistors are connected in parallel on the first capacitor (C1), a pin 1 of the transformer (T1) is connected with a common end of the rectifier bridge stack (DB 1) and a pin 3 of the transformer (T1) is connected with a pin D of the first field effect transistor (Q1), a pin 5 and a pin 6 of the transformer (T1) are connected in series with a second diode (D2), a ninth resistor (R9) and an electrolytic capacitor (737EC 6), a pin 6 of the transformer (T59642) is also connected with a Protective Ground (PGND), a common end of the ninth resistor (R9) and the electrolytic capacitor (EC 29) is connected with a power supply, and an optical coupler 2 of an AC/DC power supply voltage stabilizing chip (U2) is connected with a pin 4 of an optical coupler (U464) and a pin 464 of the fourth capacitor (464) are connected with a pin C4), a pin 1 of the optical coupler (U11) is connected with a pin 2 of the Schottky diode through a seventeenth resistor (R17), a thirteenth resistor (R13) is connected between the pin 1 and the pin 2 of the optical coupler (U11), a sixteenth resistor (R16), a fifth capacitor (C5) and a twelfth resistor (R12) are connected in series between the common end of the seventeenth resistor (R17) and the Schottky diode and the 2 pin of the optocoupler (U11), a fourteenth resistor (R14) and a fifteenth resistor (R15) are connected in parallel between the common end of the sixteenth resistor (R16) and the fifth capacitor (C5) and the ground end GND, the ground terminal GND and the 2 pin of the optical coupler (U11) are connected with the 2 pin of a parallel voltage-stabilizing integrated circuit (Q3), the pin 3 of the parallel voltage-stabilizing integrated circuit (Q3) is connected with a ground terminal (GND), and the pin 3 of the parallel voltage-stabilizing integrated circuit (Q3) is connected with the common end of a sixteenth resistor (R16) and a fifth capacitor (C5).