Control system for detecting vacuum degree

Abstract

The invention relates to the technical field of vacuum degree detection, and discloses a control system for detecting vacuum degree, which comprises a single chip microcomputer, a power supply module and a detection module, and is characterized in that the power supply module is connected with the single chip microcomputer, and the detection module is connected with the single chip microcomputer; the power supply module comprises a battery charging chip U2, the battery charging chip U2 is connected with the single-chip microcomputer, the battery charging chip U2 is connected with a diode D1 and a diode D2, the diode D1 is provided with an E + point, the diode D2 is provided with a VBUS point, the diode D1 and the diode D2 are connected in parallel and then provided with a Vin point, a pin 11 of the battery charging chip U2 is connected with a resistor R9 in series, the resistor R9 is provided with a P + point, the P + point is used for being connected with a battery protection chip U3, and the battery protection chip U3 is connected with the battery charging chip U2. And the battery protection chip U3 is connected with a battery. The applicability of the vacuum measuring device can be improved through two power supply modes, power can be stored through the battery, portability and a standby power supply are provided, and the influence of external power supply interruption is avoided.

Description

Technical Field

[0001] This invention relates to the field of vacuum degree detection technology, and in particular to a control system for detecting vacuum degree. Background Technology

[0002] Existing plug-in vacuum testing devices require a 220V AC power supply to operate, making them unusable in remote substations or mobile maintenance scenarios without power, which greatly limits testing flexibility. During testing, the high-voltage output terminal generates approximately 30kV pulse voltage, and the magnetic field output terminal has a residual voltage of 400V. Careless operation can easily lead to electric shock accidents, and a safe distance of more than 1 meter must be strictly maintained. Summary of the Invention

[0003] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0004] A control system for detecting vacuum level includes a microcontroller, a power supply module, and a detection module. The power supply module is connected to pins 10 and 11 of the microcontroller, and the detection module is connected to pin 18 of the microcontroller via connector J2.

[0005] The power module includes a battery charging chip U2. Pin 3 of the battery charging chip U2 is connected to diodes D1 and D2. Diodes D1 and D2 are connected in parallel to pin 3. Diode D1 has an E+ point, and diode D2 has a VBUS point. The parallel connection of diodes D1 and D2 creates a Vin point. Pin 11 of the battery charging chip U2 is connected in series with a resistor R9. Resistor R8 is connected in parallel with resistor R9 to detect the charging current and perform constant current charging. Resistor R9 has a P+ point, which is used to connect to a battery protection chip U3. The battery protection chip U3 is connected to a connector J4, which is used to connect to the battery. The battery protection chip U3 can charge or discharge the battery.

[0006] Furthermore, resistors R32 and R34 are connected in series at point P+. Resistor R34 has a detection point TP6 for detecting battery power. Resistor R33 is connected between resistors R32 and R34 and is grounded to reduce the battery voltage to below 3.3.

[0007] Furthermore, pins 30 and 31 of the microcontroller are connected to connector J1, which is used to connect to the display screen.

[0008] Furthermore, a capacitor C14 is connected in series with pin 14 of the battery charging chip U2, and the capacitor C14 is connected to the Vin point.

[0009] Furthermore, pin 1 of the battery charging chip U2 is connected in series with transistor Q1, diode D3 and inductor L1 and then connected to pin 11 of the battery charging chip U2. Transistor Q1 is connected at Vin point, and diode D4 is connected in parallel between diode D3 and inductor L1. Diode D4 is grounded.

[0010] Furthermore, resistor R8 is connected in parallel with resistor R9, and capacitors C6 and C7 are connected in parallel between resistor R9 and point P+. Pin 10 of battery charging chip U2 is connected between resistor R9 and point P+, pin 9 of battery charging chip U2 is connected between resistor R9 and point P+ after being connected in series with resistor R7, and pin 8 of battery charging chip U2 is grounded after being connected in series with resistor R26 and capacitor C5.

[0011] Furthermore, the battery protection chip U3 is model number CM 1341-LAT.

[0012] Furthermore, pin 1 of the battery protection chip U3 is connected to point P+ in series with resistor R22 and diode D5, and capacitor C12 is connected in parallel between pin 1 of the battery protection chip U3 and resistor R22, and capacitor C12 is grounded.

[0013] Furthermore, a connector J4 pin 1 is connected in parallel between the P+ point and the diode D5. The connector J4 is used to connect the battery. The connector J4 pin 1 is connected to pins 2, 3, 4, and 5 of the battery protection chip U3 after being connected in series with resistor R14. The connector J4 pins 2 and 3 are connected in parallel with resistor R16 after being connected in series and then connected to pin 6 of the battery protection chip U3. The connector J4 pins 4 and 5 are connected in parallel with resistor R18 after being connected in series and then connected to pin 7 of the battery protection chip U3. The connector J4 pins 6 and 7 are connected in parallel with resistor R20 after being connected in series and then connected to pin 8 of the battery protection chip U3. The connector J4 pin 8 is connected to pin 13 of the battery protection chip U3 after being connected in series with resistors R25 and R27.

[0014] Furthermore, resistor R15 and transistor Q2 are connected in parallel with resistor 14. Transistor Q2 is also connected in series with resistor R10. Resistor R10 is connected in parallel between pins 2 and 3 of connector J4 and resistor R16. Capacitor C8 is connected in parallel between resistor R14 and pins 2, 3, 4, and 5 of battery protection chip U3, and capacitor C8 is grounded. Resistor R16 is connected in parallel with resistor R17 and transistor Q3. Transistor Q3 is also connected in series with resistor R11. Resistor R11 is connected in parallel between pins 4 and 5 of connector J4 and resistor R18. Capacitor C9 is connected in parallel between resistor R16 and pin 6 of battery protection chip U3, and capacitor C9 is grounded. A resistor R19 and a transistor Q4 are connected in parallel to resistor R18. Transistor Q4 is also connected in series with resistor R12. Resistor R12 is connected in parallel between pins 6 and 7 of connector J4 and resistor R20. A capacitor C10 is connected in parallel between resistor R18 and pin 7 of battery protection chip U3, and capacitor C10 is grounded. A resistor R21 and a transistor Q5 are connected in parallel to resistor R20. Transistor Q5 is also connected in series with resistor R13. Resistor R13 is connected in parallel between pin 8 of connector J4 and resistor R25. A capacitor C11 is connected in parallel between resistor R20 and pin 8 of battery protection chip U3, and capacitor C11 is grounded.

[0015] The beneficial effects of this invention are:

[0016] The battery charging chip U2 has two power supply methods: one is to be directly powered by external AC power, and the other is to be powered by an internal battery. The two power supply methods can improve the applicability of the vacuum measuring device. It can be charged by battery, providing portability and backup power, and is not affected by external power interruption. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of the invention.

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is the circuit diagram of a microcontroller;

[0020] Figure 2 This is a schematic diagram of connector J2;

[0021] Figure 3 This is a schematic diagram of connector J1;

[0022] Figure 4 The circuit diagram for battery protection chip U3;

[0023] Figure 5 Circuit diagram of battery charging chip U2;

[0024] Figure 6 This is a circuit diagram for battery power detection. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0026] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0027] like Figures 1-6 As shown, a control system for detecting vacuum level includes a microcontroller, a power supply module, and a detection module. The microcontroller is an STM32F103C8. The detection module is connected to the 18-pin connector of the microcontroller via connector J2. The detection module is an existing vacuum gauge. The microcontroller is used to receive the analog data collected by the vacuum gauge and to derive the detected vacuum level from the analog data collected.

[0028] Specifically, the power module includes a battery charging chip U2. Pin 3 of the battery charging chip U2 is connected to diodes D1 and D2. Diodes D1 and D2 are connected in parallel to pin 3. Diode D1 has an E+ point, and diode D2 has a VBUS point. The parallel connection of diodes D1 and D2 creates a Vin point. Pin 11 of the battery charging chip U2 is connected in series with a resistor R9. Resistor R9 is connected in parallel with a resistor R8. Resistor R9 has a P+ point, which is used to connect to a battery protection chip U3. The battery protection chip U3 is connected to a connector J4, which is used to connect to a battery. The battery protection chip U3 can charge or discharge the battery.

[0029] In this invention, the operating voltage of the STM32F103C8 microcontroller is 3.3V. The voltage can be controlled at 3.3V by the battery charging chip U2, and power is supplied to the microcontroller through pins 5 and 3 of the battery charging chip U2.

[0030] In this invention, the battery charging chip U2 is model SLM 6900. The battery charging chip U2 has two power supply methods: one is direct power supply from an external AC power source, and the other is power supply from an internal battery. The external AC power supply is provided to the battery charging chip U2 via connecting to an external 24V voltage source at point E+ or directly connecting to a power supply node via point VBUS. The internal battery power supply is provided to the current control chip via point P+. In this invention, diode D1 at point E+ is used to prevent reverse current from flowing into the power source, ensuring that the current flows only in a predetermined direction, thereby protecting the circuit from damage caused by reverse current. Similarly, diode D2 at point VBUS is used to prevent reverse current from flowing into the power source, ensuring that the current flows only in a predetermined direction, thereby protecting the circuit from damage caused by reverse current.

[0031] In this invention, a capacitor C3 is connected in series at the Vin point, and C3 is grounded to smooth the input voltage, effectively reducing power supply noise and ensuring the stable operation of the entire circuit. Furthermore, a capacitor C14 is connected in series at pin 14 of the battery charging chip U2, and capacitor C14 is connected to the Vin point. C3 and C4 together form a low-pass filter, which can filter out high-frequency interference signals.

[0032] Specifically, pin 1 of the battery charging chip U2 is connected in series with transistor Q1, diode D3, and inductor L1, and then connected to pin 11 of the battery charging chip U2. Transistor Q1 is connected at point Vin. Diode D4 is connected in parallel between diode D3 and inductor L1, and diode D4 is grounded. Resistor R9 is connected in parallel with resistor R8. Capacitors C6 and C7 are connected in parallel between resistor R9 and point P+. Pin 10 of the battery charging chip U2 is connected between resistor R9 and point P+. Pin 9 of the battery charging chip U2 is connected in series with resistor R7 and then connected between resistor R9 and point P+. Pin 8 of the battery charging chip U2 is connected in series with resistor R26 and capacitor C5 and then grounded.

[0033] In this invention, Q1 is a MOSFET, primarily functioning as a switching element to control the on / off state of current. When the battery needs charging, Q1 is connected, allowing current to flow through Q1 and to point P+. When the battery does not need charging (i.e., during discharge), Q1 is not connected, and the battery current flows through P+ into the battery charging chip U2. D3 and D4 prevent reverse current, ensuring unidirectional current flow and protecting the circuit from reverse current surges. L1 is used for energy storage and filtering, smoothing input voltage fluctuations and ensuring output voltage stability and reliability. Diodes D3 and D4 prevent reverse current, ensuring unidirectional current flow and protecting the circuit from reverse current surges. Furthermore, grounding diode D4 further protects the circuit; if the current is too large and reverses, it can direct the current to the ground terminal, protecting the circuit. L1 is used for energy storage and filtering; during charging, the inductor stores energy; during discharging, it releases energy to smooth current fluctuations and ensure stable circuit operation.

[0034] In this invention, resistors R8 and R9 are used to set the charging current. Appropriate resistors R8 and R9 are selected based on actual conditions, ensuring that the resistance value of the parallel connection of R8 and R9 is suitable for the battery, so that the current flowing through point P+ is suitable for charging the battery. Resistor R7 is used to limit the current and protect the circuit. Capacitors C6 and C7 are used to filter out high-frequency and low-frequency noise, protect the circuit from interference, ensure the stability of the power supply voltage, and reduce voltage fluctuations.

[0035] In this invention, the battery charging chip U2 has a resistor R6 and a capacitor C5 connected in series on its 8 pins. The capacitor C5 is grounded, and the resistor R6 is used to limit the current, which plays a protective role in the circuit to prevent damage to other components due to excessive current and ensure the safe operation of the circuit. The capacitor C5 is used for filtering, which can smooth voltage fluctuations, reduce noise interference, and ensure the stable operation of the circuit.

[0036] Specifically, resistors R32 and R34 are connected in series at point P+. Resistor R34 has a detection point TP6, which is used for battery power detection. Resistor R33 is connected between resistors R32 and R34 and is grounded.

[0037] In this invention, resistors R32 and R33 are used to limit the current and protect other components in the circuit from damage by excessive current; resistor R34 is used for voltage division and participates in the battery power detection circuit. Through voltage division, it reduces the battery voltage to a suitable range for measurement, thereby accurately detecting the battery power.

[0038] Specifically, pins 30 and 31 of the microcontroller are connected to connector J1, which is used to connect to a display screen. The display screen is used to display the vacuum level value measured by the detection module in real time.

[0039] Specifically, the battery protection chip U3 is model CM 1341-LAT. Pin 1 of the battery protection chip U3 is connected to the P+ point after being connected in series with resistor R22 and diode D5. A capacitor C12 is connected in parallel between pin 1 of the battery protection chip U3 and resistor R22, and capacitor C12 is grounded. Pin 1 of connector J4 is connected in parallel between point P+ and diode D5. Connector J4 is used to connect the battery. Pin 1 of connector J4 is connected in series with resistor R14 and then connected to pins 2, 3, 4, and 5 of battery protection chip U3. Pins 2 and 3 of connector J4 are connected in parallel with resistor R16 and then connected to pin 6 of battery protection chip U3. Pins 4 and 5 of connector J4 are connected in parallel with resistor R18 and then connected to pin 7 of battery protection chip U3. Pins 6 and 7 of connector J4 are connected in parallel with resistor R20 and then connected to pin 8 of battery protection chip U3. Pin 8 of connector J4 is connected in series with resistors R25 and R27 and then connected to pin 13 of battery protection chip U3.

[0040] In this invention, resistor R15 and transistor Q2 are connected in parallel to resistor 14. Transistor Q2 is also connected in series with resistor R10. Resistor R10 is connected in parallel between pins 2 and 3 of connector J4 and resistor R16. Capacitor C8 is connected in parallel between resistor R14 and pins 2, 3, 4, and 5 of battery protection chip U3, and capacitor C8 is grounded. Resistor R17 and transistor Q3 are connected in parallel to resistor R16. Transistor Q3 is also connected in series with resistor R11. Resistor R11 is connected in parallel between pins 4 and 5 of connector J4 and resistor R18. Capacitor C9 is connected in parallel between resistor R16 and pin 6 of battery protection chip U3, and capacitor C9 is grounded. A resistor R19 and a transistor Q4 are connected in parallel to resistor R18. Transistor Q4 is also connected in series with resistor R12. Resistor R12 is connected in parallel between pins 6 and 7 of connector J4 and resistor R20. A capacitor C10 is connected in parallel between resistor R18 and pin 7 of battery protection chip U3, and capacitor C10 is grounded. A resistor R21 and a transistor Q5 are connected in parallel to resistor R20. Transistor Q5 is also connected in series with resistor R13. Resistor R13 is connected in parallel between pin 8 of connector J4 and resistor R25. A capacitor C11 is connected in parallel between resistor R20 and pin 8 of battery protection chip U3, and capacitor C11 is grounded.

[0041] In this invention, resistors R14 and R15 limit the current flowing through Q2, thereby protecting Q2 from overcurrent damage and ensuring stable circuit operation. Resistor R10 works in conjunction with R14 and R15 to further enhance the protection of Q2, preventing malfunctions caused by excessive current. Transistor Q2 is a MOSFET, responsible for controlling current flow in the circuit. Capacitor C8 is a filter capacitor, which stabilizes the voltage, reduces the impact of voltage fluctuations on the circuit, and ensures a smooth battery charging process. Resistors R16 and R17 limit the current flowing through Q3, thereby protecting Q3 from overcurrent damage and ensuring stable circuit operation. Resistor R11 works in conjunction with R16 and R17 to further enhance the protection of Q3, preventing malfunctions caused by excessive current. Transistor Q3 is a MOSFET, responsible for controlling current flow in the circuit. Capacitor C9 is a filter capacitor, which stabilizes the voltage, reduces the impact of voltage fluctuations on the circuit, and ensures a smooth battery charging process. Resistors R18 and R19 limit the current through Q4, protecting it from overcurrent damage and ensuring stable circuit operation. Resistor R12 works in conjunction with R18 and R19 to further enhance the protection of Q4, preventing malfunctions caused by excessive current. Transistor Q4 is a MOSFET, responsible for controlling current flow in the circuit. Capacitor C10 is a filter capacitor, stabilizing the voltage and reducing the impact of voltage fluctuations on the circuit, ensuring a smooth battery charging process. Resistors R20 and R21 limit the current through Q5, protecting it from overcurrent damage and ensuring stable circuit operation. Resistor R13 works in conjunction with R20 and R21 to further enhance the protection of Q5, preventing malfunctions caused by excessive current. Transistor Q5 is a MOSFET, responsible for controlling current flow in the circuit. Capacitor C11 is a filter capacitor, stabilizing the voltage and reducing the impact of voltage fluctuations on the circuit, ensuring a smooth battery charging process.

[0042] In this invention, resistors R25 and R27 are connected in series and then in parallel with capacitor C14. Resistors R23 and R24 are connected between capacitor C14 and resistor R25. Resistors R23 and R24 are connected in series and then connected to pin 12 of battery protection chip U3. Pin 11 of battery protection chip U3 is connected between resistors R23 and R24. Pin 9 of battery protection chip U3 is grounded, and pin 10 of battery protection chip U3 is connected in series with capacitor C3, which is connected between resistor R25 and capacitor C14. The resistor 25 is also connected in parallel with a resistor R26 and a dual N-channel MOS chip Q7. Resistor R26 is connected to pins 5, 6, 7, and 8 of the dual N-channel MOS chip Q7. Pin 3 of the dual N-channel MOS chip Q7 is connected between resistors R25 and R27. Pin 4 of the dual N-channel MOS chip Q7 is connected in series with resistor R28 and then to pin 14 of the battery protection chip U3. Pin 2 of the dual N-channel MOS chip Q7 is connected in series with transistor Q6 and then to pin 15 of the battery protection chip U3. Transistor Q6 is also connected to resistor R30, which is grounded. Pin 1 of the dual N-channel MOS chip Q7 is connected in series with resistor R31 and then to pin 16 of the battery protection chip U3. A resistor R29 is located between pin 1 of the dual N-channel MOS chip Q7 and resistor R31. Resistor R29 is connected to pin 2 of the dual N-channel MOS chip Q7 and is grounded.

[0043] In this invention, resistor R25 is used to set the charging protection current. When the resistance of R25 is 0.1Ω, it sets the charging protection current to 0.25A. During charging, if the current exceeds this set value, the circuit will take protective measures, turning off the charging control MOSFET and stopping charging. Resistor R27 is used for voltage division. The divided voltage is input to pin 13 of the battery protection chip U3. By monitoring the divided voltage, the system can effectively manage the battery voltage. For example, when the voltage at pin 13 of the battery protection chip U3 exceeds a certain threshold and persists for a period of time, the battery protection chip U3 will consider an overcurrent discharge situation to have occurred, and then turn off the MOSFET to stop the discharge, thereby protecting the circuit safety. Resistor R23 acts as a pull-up resistor, ensuring that pin 12 of the battery protection chip U3 remains at a high level when there is no signal, thereby stabilizing the circuit's operating state. Resistor R24, together with capacitors C13 and C14, forms an RC filter circuit, which can effectively filter out high-frequency noise in the power supply and provide a stable voltage environment for the circuit. The dual N-channel MOSFET Q7 regulates the battery's discharge current by controlling its on / off state. When discharge is needed, Q7 is on, allowing current to flow; when battery protection is required, Q7 is off, cutting off the current and ensuring the battery operates within a safe range. Resistor R26 is used for current limiting. Resistors R29, R30, and R31 limit the current magnitude, protecting the subsequent Q6 transistor from excessive current surges. Resistor R28 is also used for current limiting, protecting the subsequent dual N-channel MOSFET Q7 from excessive current surges.

[0044] (1) Unless otherwise defined, the same reference numerals in the embodiments and drawings of this disclosure have the same meaning.

[0045] (2) The accompanying drawings of the embodiments of this disclosure only involve the structures involved in the embodiments of this disclosure. Other structures can be referred to the general design.

[0046] (3) For clarity, components or areas are enlarged in the drawings used to describe embodiments of the present disclosure. It will be understood that when an element is referred to as being “above” or “below” another element, the element may be “directly” located “above” or “below” the other element, or there may be an intermediate element.

[0047] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A control system for detecting vacuum level, characterized in that: It includes a microcontroller, a power supply module, and a detection module. The power supply module is connected to the microcontroller, and the detection module is connected to the 18 pins of the microcontroller via connector J2. The power module includes a battery charging chip U2. Pin 3 of the battery charging chip U2 is connected to diodes D1 and D2. Diodes D1 and D2 are connected in parallel to pin 3. Diode D1 has an E+ point, and diode D2 has a VBUS point. The parallel connection of diodes D1 and D2 creates a Vin point. Pin 11 of the battery charging chip U2 is connected in series with a resistor R9. Resistor R8 is connected in parallel with resistor R9 to detect the charging current and perform constant current charging. Resistor R9 has a P+ point, which is used to connect to a battery protection chip U3. The battery protection chip U3 is connected to a connector J4, which is used to connect to the battery. The battery protection chip U3 can charge or discharge the battery.

2. The control system for detecting vacuum degree according to claim 1, characterized in that: The P+ point is connected in series with resistors R32 and R34. Resistor R34 has a detection point TP6, which is used for battery power detection. Resistor R33 is connected between resistors R32 and R34. Resistor R33 is grounded to reduce the battery voltage to below 3.

3.

3. The control system for detecting vacuum degree according to claim 2, characterized in that: The microcontroller's pins 30 and 31 are connected to connector J1, which is used to connect to the display screen.

4. The control system for detecting vacuum degree according to claim 2, characterized in that: The battery charging chip U2 has a capacitor C14 connected in series at pin 14, and the capacitor C14 is connected to the Vin point.

5. A control system for detecting vacuum degree according to claim 4, characterized in that: Pin 1 of the battery charging chip U2 is connected in series with transistor Q1, diode D3 and inductor L1 and then connected to pin 11 of the battery charging chip U2. Transistor Q1 is connected at Vin point, and diode D4 is connected in parallel between diode D3 and inductor L1. Diode D4 is grounded.

6. A control system for detecting vacuum degree according to claim 5, characterized in that: A capacitor C6 and a capacitor C7 are connected in parallel between the resistor R9 and the P+ point. Pin 10 of the battery charging chip U2 is connected between the resistor R9 and the P+ point. Pin 9 of the battery charging chip U2 is connected between the resistor R9 and the P+ point after being connected in series with the resistor R7. Pin 8 of the battery charging chip U2 is grounded after being connected in series with the resistor R26 and the capacitor C5.

7. A control system for detecting vacuum degree according to claim 6, characterized in that: The battery protection chip U3 is model number CM 1341-LAT.

8. A control system for detecting vacuum degree according to claim 7, characterized in that: The battery protection chip U3 has a resistor R22 and a diode D5 connected in series at pin 1 and then connected to point P+. A capacitor C12 is connected in parallel between pin 1 of the battery protection chip U3 and the resistor R22, and the capacitor C12 is grounded.

9. A control system for detecting vacuum degree according to claim 8, characterized in that: Pin 1 of connector J4 is connected in parallel between point P+ and diode D5. Connector J4 is used to connect the battery. Pin 1 of connector J4 is connected in series with resistor R14 and then connected to pins 2, 3, 4, and 5 of battery protection chip U3. Pins 2 and 3 of connector J4 are connected in parallel with resistor R16 and then connected to pin 6 of battery protection chip U3. Pins 4 and 5 of connector J4 are connected in parallel with resistor R18 and then connected to pin 7 of battery protection chip U3. Pins 6 and 7 of connector J4 are connected in parallel with resistor R20 and then connected to pin 8 of battery protection chip U3. Pin 8 of connector J4 is connected in series with resistors R25 and R27 and then connected to pin 13 of battery protection chip U3.

10. A control system for detecting vacuum degree according to claim 9, characterized in that: A resistor R15 and a transistor Q2 are connected in parallel to resistor 14. Transistor Q2 is also connected in series with resistor R10. Resistor R10 is connected in parallel between pins 2 and 3 of connector J4 and resistor R16. A capacitor C8 is connected in parallel between resistor R14 and pins 2, 3, 4, and 5 of battery protection chip U3, and capacitor C8 is grounded. A resistor R17 and a transistor Q3 are connected in parallel to resistor R16. Transistor Q3 is also connected in series with resistor R11. Resistor R11 is connected in parallel between pins 4 and 5 of connector J4 and resistor R18. A capacitor C9 is connected in parallel between resistor R16 and pin 6 of battery protection chip U3, and capacitor C9 is grounded. A resistor R19 and a transistor Q4 are connected in parallel to resistor R18. Transistor Q4 is also connected in series with resistor R12. Resistor R12 is connected in parallel between pins 6 and 7 of connector J4 and resistor R20. A capacitor C10 is connected in parallel between resistor R18 and pin 7 of battery protection chip U3, and capacitor C10 is grounded. A resistor R21 and a transistor Q5 are connected in parallel to resistor R20. Transistor Q5 is also connected in series with resistor R13. Resistor R13 is connected in parallel between pin 8 of connector J4 and resistor R25. A capacitor C11 is connected in parallel between resistor R20 and pin 8 of battery protection chip U3, and capacitor C11 is grounded.

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