Detection device with power self-compensation function

Abstract

The utility model provides a kind of detection device with power supply self-compensation function, including shell, detector detection component, energy storage unit and power supply self-compensation unit are equipped in shell, power supply self-compensation unit is connected with energy storage unit, energy storage unit and power supply self-compensation unit are connected with power supply management circuit, power supply management circuit is connected with detector detection component.The utility model automatically detects external power supply through power supply self-compensation unit, when external power supply is lower than the working voltage of detector detection component, automatically opens energy storage unit to power supply, realizes the automatic compensation when detector detection component power supply is insufficient, solves the communication anomaly and interference material detection problem caused by power supply line loss in long-distance gas monitoring system.The utility model is used for long distance or detector device, when power supply is insufficient for alarm instant, solves the unstable problem of detection device through power supply self-compensation.

Description

Technical Field

[0001] This utility model relates to the technical field of gas sampling and detection, and in particular to a detection device with power supply self-compensation function. Background Technology

[0002] In many fields such as industrial production, urban gas transmission, underground utility tunnels, and hazardous chemical storage, gas monitoring systems have become key facilities for ensuring personnel safety and stable equipment operation. The system typically consists of gas detectors and a controller. The controller provides power to the detectors via a wired connection and acquires real-time data on gas concentration and equipment operating status, thereby enabling timely early warning of abnormal situations such as gas leaks and exceeding safety limits in the target area.

[0003] However, in practical applications, due to the wide monitoring area and complex layout, long transmission lines are often required to connect the controller and the detector. According to circuit principles, the resistance of the cable itself causes significant voltage drop (line loss) during long-distance transmission, and this problem worsens with increasing transmission distance. Especially when the detector is in alarm mode, the operating current of its internal circuitry increases significantly (e.g., the activation of audible and visual alarm devices, signal enhancement modules, etc.), further exacerbating the voltage drop on the line.

[0004] Line loss during alarm cycles directly leads to insufficient power supply voltage to the detector, causing malfunctions such as detector startup issues, data deviations, data transmission interruptions, and unstable operation, severely impacting the reliability and accuracy of gas monitoring systems. Current technologies typically mitigate line loss by using thicker transmission cables and increasing controller output voltage; however, these methods are costly and lack scalability, failing to meet the demands of gas monitoring systems for long-distance, high-precision, and high-reliability applications.

[0005] Therefore, there is an urgent need to develop a new power supply technology to ensure the stable and reliable operation of gas detectors in long-distance transmission scenarios.

[0006] Utility model patent application number 202111566094.5 discloses a gas detector with self-diagnostic function. It includes a gas sensor module for detecting gas concentration, a temperature and humidity detection module for detecting ambient temperature and humidity, a clock module for acquiring system time, a power supply voltage detection module for acquiring the power supply voltage of the gas sensor module, a sensor signal detection module for acquiring the voltage analog signal of the gas sensor module, a gas concentration compensation calculation module for compensating the gas concentration detected by the gas sensor module, a self-diagnostic logic judgment module for judging the working state of the gas detector, a data analysis module for controlling the gas concentration compensation calculation module according to the working state of the gas detector, and a wireless data transmission module for uploading data. This utility model's gas detector can self-diagnose its own working state and provide accurate gas concentration data. The self-diagnostic logic judgment module in the above patent is used to judge the working status of the gas detector based on the power supply voltage of the gas sensor module, the voltage analog signal of the gas sensor module, the current system time, and the temperature and humidity of the current environment. However, the above patent mainly addresses the accuracy problem by self-compensating for the detected concentration due to the influence of temperature and humidity; it cannot diagnose and compensate for voltage drop or insufficient power supply to the detection device. Utility Model Content

[0007] To address the technical problem that existing detection devices cannot meet the application requirements of gas monitoring systems for long distance, high precision, and high reliability, this utility model proposes a detection device with power supply self-compensation function and its compensation method. This solves the problem of power supply being affected by factors such as alarm moment and line loss interference, and addresses the detection accuracy problem caused by power supply issues through power supply compensation.

[0008] To achieve the above objectives, the technical solution of this utility model is as follows: A detection device with power supply self-compensation function includes a housing, and a detector detection component, an energy storage unit and a power supply self-compensation unit are provided inside the housing. The power supply self-compensation unit is connected to the energy storage unit, and both the energy storage unit and the power supply self-compensation unit are connected to a power supply management circuit. The power supply management circuit is connected to the detector detection component.

[0009] Preferably, the power supply self-compensation unit includes an external power supply detection circuit, an external power supply control switch, a low voltage detection circuit, an undervoltage control switch, a voltage detection circuit, a foot pressure control switch, an energy storage unit charging and discharging management circuit, an energy storage unit power supply control switch, and an energy storage unit voltage conditioning circuit. The external power supply is connected to the voltage detection circuit through an external power supply interface, the voltage detection circuit is connected to the foot pressure control switch, and the foot pressure control switch is connected to the power supply management circuit. The lithium battery of the energy storage unit is connected to the energy storage unit charge / discharge management circuit, which is connected to the energy storage voltage detection circuit. The energy storage voltage detection circuit is connected to the energy storage unit power supply control switch. The external power supply interface is connected to the energy storage unit charge / discharge management circuit, the external power supply detection circuit, and the low voltage detection circuit. The external power supply detection circuit and the energy storage unit charge / discharge management circuit are both connected to the external power supply control switch. The external power supply control switch is connected to the undervoltage control switch. The low voltage detection circuit is connected to the undervoltage control switch. The undervoltage control switch is connected to the energy storage unit power supply control switch. The energy storage unit power supply control switch is connected to the power supply management circuit through the energy storage unit voltage conditioning circuit.

[0010] Preferably, the energy storage unit is a lithium battery, and the lithium battery is connected to the power supply self-compensation unit; The detector detection component includes an MCU control unit, a sensing unit, and a circuit conditioning unit. The sensing unit is connected to the circuit conditioning unit, and the circuit conditioning unit is connected to the MCU control unit. The MCU control unit is connected to both the detector communication circuit and the detector alarm output circuit. The power management circuit is connected to the sensing unit, the MCU control unit, the detector communication circuit, and the detector alarm output circuit.

[0011] Preferably, the circuit conditioning unit includes an operational amplifier circuit and an ADC analog-to-digital converter connected in sequence. The operational amplifier circuit is connected to the output terminal of the sensor unit, and the ADC analog-to-digital converter is connected to the MCU control unit. The power supply control switch of the energy storage unit is connected to the MCU control unit.

[0012] Preferably, the energy storage unit charge / discharge management circuit includes a protection chip U61. The TEMP and GND pins of the protection chip U61 are both grounded. The input pin VIN of the protection chip U61 is connected to an external power supply and one end of a capacitor C61, with the other end of capacitor C61 grounded. The enable pin CE of the protection chip U61 is connected to the positive terminal of the external power supply, and the negative terminal of the external power supply is grounded. A TVS diode D61 is connected in parallel across the two ends of the external power supply. The CHRG pin of the protection chip U61 is connected to the positive terminal of the lithium battery of the energy storage unit through a resistor R62. The DONE pin of the protection chip U61 is also connected to the positive terminal of the lithium battery through a resistor R61. The BAT pin of the protection chip U61 is grounded through the parallel capacitor C62 and the TVS diode D62, and the BAT pin of the protection chip U61 outputs the battery voltage Vb_IN of the energy storage unit.

[0013] Preferably, the external power supply detection circuit includes a transistor Q15, the collector of transistor Q15 is grounded, the base of transistor Q15 is connected to one end of resistor R14 and one end of resistor R15 through resistor R16, the other end of resistor R15 is grounded, and the other end of resistor R14 is connected to an external power supply interface; the emitter of transistor Q15 is connected to an external power supply control switch. The external power supply control switch includes a MOSFET Q16. The source of the MOSFET Q16 is connected to one end of the resistor R17 and the output terminal of the energy storage unit charge and discharge management circuit, respectively. The gate of the MOSFET Q16 is connected to the emitter of the transistor Q15. The drain of the MOSFET Q16 is connected to the undervoltage control switch. The emitter of the transistor Q15 is connected to the other end of the resistor R17. The low voltage detection circuit includes a Zener diode D10 and a transistor Q10. The external power supply interface is connected to the positive terminal of the Zener diode D10. The negative terminal of the Zener diode D10 is connected to one end of resistor R10 and one end of resistor R11. The other end of resistor R10 is grounded. The other end of resistor R11 is connected to the base of transistor Q10. The collector of transistor Q10 is grounded. The emitter of transistor Q10 is connected to the undervoltage control switch. The undervoltage control switch includes a MOSFET Q11. The gate of the MOSFET Q11 is connected to the emitter of the transistor Q10. The emitter of the transistor Q10 is connected to one end of a resistor R12. The other end of the resistor R12 and the drain of the MOSFET Q11 are both connected to the drain of the MOSFET Q16. The source of the MOSFET Q11 is connected to the power supply control switch of the energy storage unit. The energy storage voltage detection circuit includes a Zener diode D30 and a transistor Q30. The output terminal of the energy storage unit charge and discharge management circuit is connected to the positive terminal of the Zener diode D30. The negative terminal of the Zener diode D30 is connected to one end of resistor R30 and one end of resistor R31. The other end of resistor R30 is grounded. The other end of resistor R31 is connected to the base of transistor Q30. The collector of transistor Q30 is grounded. The emitter of transistor Q30 is connected to the input terminal of the energy storage unit power supply control switch. The power supply control switch of the energy storage unit includes a MOSFET Q31. The gate of the MOSFET Q31 is connected to the emitter of the transistor Q30. The emitter of the transistor Q30 is connected to one end of a resistor R32. The other end of the resistor R32 is connected to the source of the MOSFET Q11 and the source of the MOSFET Q31 respectively. The drain of the MOSFET Q31 receives the output voltage VCC_B0 of the energy storage unit. The voltage detection circuit includes a Zener diode D50 and a transistor Q50. An external power supply is connected to the positive terminal of the Zener diode D50. A capacitor C50 is connected in parallel across the two ends of the external power supply. The negative terminal of the Zener diode D50 is connected to a resistor R51 and one end of a resistor R50. The other end of the resistor R50 is grounded. The other end of the resistor R51 is connected to the base of the transistor Q50. The collector of the transistor Q50 is grounded. The emitter of the transistor Q50 is connected to the foot pressure control switch. The foot pressure control switch includes a MOSFET Q51. The emitter of the transistor Q50 is connected to one end of the resistor R52 and the gate of the MOSFET Q51, respectively. The other end of the resistor R52 and the source of the MOSFET Q51 are connected to the positive terminal of the external power supply. The negative terminal of the external power supply is grounded. The drain of the MOSFET Q51 is connected to one end of the capacitor C51 and the detector power supply management circuit, respectively. The other end of the capacitor C51 is grounded.

[0014] Preferably, transistor Q15 is an NPN transistor, and MOSFET Q16 is a P-MOS transistor; transistor Q10 is an NPN transistor, and MOSFET Q11 is an N-MOS transistor; transistor Q30 is an NPN transistor, and MOSFET Q31 is a P-MOS transistor; transistor Q50 is an NPN transistor, and MOSFET Q51 is a P-MOS transistor. A diode is connected in anti-parallel between the source and drain of each of the MOSFETs Q16, Q11, Q31, and Q51.

[0015] Preferably, the energy storage unit voltage conditioning circuit includes a power processing chip U20. The input pin IN of the power processing chip U20 is connected to the drain of the MOSFET Q31 of the energy storage unit power supply control switch. The enable pin EN of the power processing chip U20 is connected to one end of resistor R23 and one end of capacitor C21, respectively. The other end of capacitor C21 is grounded. The other end of resistor R23 is connected to the drain of MOSFET Q31. A capacitor C22 is connected in parallel between the other end of resistor R23 and the other end of capacitor C21. The pin G of the power processing chip U20... ND is grounded. An inductor L20 is connected between the input pin IN and the pin SW of the power processing chip U20. The pin SW of the power processing chip U20 is connected to the positive terminal of the Schottky diode D20. The negative terminal of the Schottky diode D20 is connected to one end of the resistor R21 and one end of the capacitor C20. The other end of the resistor R21 is connected to the pin FB of the power processing chip U20 and one end of the resistor R22. The other end of the resistor R22 is grounded. The other end of the capacitor C20 is grounded. The negative terminal of the Schottky diode D20 is connected to the detector power management circuit.

[0016] Preferably, the power supply management circuit includes a detector power supply management circuit, which is connected to the foot pressure control switch and the energy storage unit voltage conditioning circuit, and is also connected to the MCU control unit, the sensing unit and the detector communication circuit. The MCU control unit is connected to the detector communication circuit and the detector alarm output circuit.

[0017] Preferably, the detector power supply management circuit includes diode D51 and diode D21. The anode of diode D51 is connected to the drain of MOS transistor Q51 of the foot pressure control switch, and the anode of diode D21 is connected to the cathode of Schottky diode D20 of the energy storage unit voltage conditioning circuit. Both the cathodes of diode D51 and diode D21 receive the power supply voltage of the detector detection component.

[0018] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention automatically detects the external power supply through a power supply self-compensation unit. When the external power supply is lower than the operating voltage of the detector's detection component, the energy storage unit is automatically activated to provide power, achieving automatic compensation when the detector's detection component is underpowered. This solves the communication abnormalities and interference detection problems caused by power line losses in long-distance gas monitoring systems. This invention effectively solves the problems of gas sampling and detection devices failing to start normally, detection data deviations, data transmission interruptions, and unstable operating states caused by insufficient power supply voltage. This invention is used for long-distance or detector devices when there is a momentary power shortage due to alarm, solving the instability problem of the detection device through a power supply self-compensation method. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the detection device of this utility model.

[0021] Figure 2 This is the diagnostic circuit diagram of the power supply self-compensation unit of this utility model.

[0022] Figure 3 The circuit diagrams show the two power supply methods of this utility model.

[0023] Figure 4 This is a circuit diagram of the charge / discharge management circuit of this utility model.

[0024] Figure 5A flowchart of the compensation method for this utility model. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example 1 like Figure 1 As shown, a detection device with self-compensation power supply function includes a housing. Inside the housing are a detector detection component, an energy storage unit, and a self-compensation power supply unit. The self-compensation power supply unit is connected to the energy storage unit, and both are connected to a power management circuit, which in turn is connected to the detector detection component. The detector detection component outputs the results of the collected ambient gas concentration analysis, drives the detector alarm output circuit for audible and visual alarms, and enables detector communication. Only when an alarm occurs, causing a momentary increase in current, will the external power supply experience insufficient power due to increased current and line loss voltage drop. In this case, the self-compensation power supply unit comes into play. The self-compensation power supply unit detects the external power supply voltage and controls the opening and closing of the energy storage unit. When the external power supply is momentarily insufficient, the energy storage unit automatically activates. The power management circuit prevents reverse current flow between the external power supply and the conditioned power supply, and transmits the voltage from the energy storage unit or the external power supply to the detector detection component. The energy storage unit is a lithium battery, which provides power to the detector detection component when the self-compensation power supply unit detects that the external power supply voltage is lower than the operating voltage threshold of the sensor unit of the detector detection component.

[0027] The detector's detection components include a sensing unit and a circuit conditioning unit. The sensing unit is connected to the circuit conditioning unit, which in turn is connected to the MCU control unit. The sensing unit converts the gas concentration signal in the environment into an electrical signal, processes it, and then sends it to the MCU control unit. The circuit conditioning unit includes an operational amplifier circuit and an ADC (Analog-to-Digital Converter) connected in sequence. The operational amplifier circuit is connected to the sensor unit, and the ADC is connected to the MCU control unit. The operational amplifier circuit amplifies the acquired concentration signal, and the ADC converts the amplified concentration signal into a digital signal and transmits it to the MCU control unit for processing. The circuit conditioning unit, through the operational amplifier circuit, conditions the weak concentration signal acquired by the sensing unit, converts it to an ADC, and then sends it to the MCU control unit for acquisition and reading, thus completing gas detection and sampling. The sensing unit is model MC227D, the MCU control unit is an STM32L series MCU controller, the operational amplifier circuit is model SGM8554, and the ADC is integrated within the MCU control unit. The MCU control unit communicates with both the detector's communication circuit and alarm output circuit. It also controls the communication, signal sampling, display, and alarm output of the detector's sensing components. The power management circuit is connected to the sensing unit, the MCU control unit, the detector's communication circuit, and the detector's alarm output circuit.

[0028] like Figure 1 As shown, the power supply self-compensation unit is used to detect the external power supply voltage and automatically control the opening or closing of the energy storage unit's charging and discharging management circuit via a control switch to manage the charging and discharging of the energy storage unit. The power supply self-compensation unit includes an external power supply detection circuit, an external power supply control switch, a low voltage detection circuit, an undervoltage control switch, a voltage detection circuit, a pressure control switch, an energy storage unit charging and discharging management circuit, an energy storage unit power supply control switch, and an energy storage unit voltage conditioning circuit. The external power supply interface is connected to the voltage detection circuit, which is connected to the pressure control switch, which is connected to the power supply management circuit. When the voltage of the external power supply is higher than the sensor unit's operating voltage threshold, the pressure control switch opens, directly transmitting the external power supply voltage to the power supply management circuit to power the sensor unit.

[0029] The lithium battery of the energy storage unit is connected to the energy storage unit's charge / discharge management circuit, and the external power supply interface is also connected to the energy storage unit's charge / discharge management circuit. When an external power supply is available, the energy storage unit's charge / discharge management circuit manages the energy storage unit's charging and discharging and battery protection. If no external power supply is available, discharging does not occur, thus protecting the lithium battery. An external power supply detection circuit is connected to the external power supply interface, which is used to connect to an external power supply. Both the external power supply detection circuit and the energy storage unit's charge / discharge management circuit are connected to an external power supply control switch. The energy storage unit's charge / discharge management circuit uses the lithium battery's voltage as the output voltage after the external power supply control switch is turned on. When the energy storage unit's charge / discharge management circuit detects an external power supply connection but low voltage, the MOSFET turns on to power the detection unit. The external power supply detection circuit detects whether the external power supply interface is connected to an external power supply. The external power supply detection circuit uses a transistor to determine the presence of an external power supply. If an external power supply is available, it drives the external power supply control switch composed of MOSFETs to open. This method can be implemented without using comparators or other logic circuits, resulting in low cost, high efficiency, and high speed. The external power supply control switch is connected to the undervoltage control switch. A low-voltage detection circuit is provided between the external power supply control switch and the undervoltage control switch. The external power supply interface is connected to the low-voltage detection circuit, which is connected to the undervoltage control switch. The undervoltage control switch is connected to the energy storage unit power supply control switch. The low-voltage detection circuit is used to detect whether the voltage of the external power supply is low, thereby controlling whether the undervoltage control switch is opened or closed.

[0030] The energy storage unit's charge / discharge management circuit is connected to the energy storage voltage detection circuit, which in turn is connected to the energy storage unit's power supply control switch. Both the low-voltage detection circuit and the energy storage voltage detection circuit use a combination of transistors and MOSFETs after being clamped by a Zener diode to determine if there is undervoltage. The energy storage unit's charge / discharge management circuit determines whether there is an external power supply and whether the energy storage unit has sufficient charge; if both conditions are met, it decides whether compensation is needed. The energy storage unit's power supply control switch is connected to the energy storage unit's voltage conditioning circuit, which boosts and adjusts the lithium battery voltage of the energy storage unit to the threshold voltage VDD that allows the detector's detection components to operate. The energy storage unit's voltage conditioning circuit is connected to the power supply management circuit, thereby transferring the lithium battery's power to the detector's detection components, powering the sensor unit, MCU control unit, detector communication circuit, and detector alarm output circuit, thus enabling the acquisition of gas concentration signals. The energy storage unit's power supply control switch is connected to the MCU control unit, informing the MCU control unit of the lithium battery's power supply status; currently, the detector's detection components are powered by an automatically compensated lithium battery.

[0031] The power supply management circuit includes a detector power supply management circuit, which is connected to the foot pressure control switch and the energy storage unit voltage conditioning circuit. The function of the detector power supply management circuit is to prevent backflow between the conditioned power supply of the energy storage unit and the direct external power supply. The detector power supply management circuit is also connected to the MCU control unit, the sensing unit, and the detector communication circuit. The MCU control unit is connected to the detector communication circuit, which transmits the collected data to the next-level device via wired or wireless means to achieve the purpose of gas environment monitoring and detection. The MCU control unit is responsible for analog signal acquisition, communication control, display, alarm functions of the sensing unit, and power supply voltage acquisition of the energy storage unit. The MCU control unit is connected to the detector alarm output circuit. When the ambient concentration is found to be higher than a set threshold, the detector alarm output circuit issues an audible and visual alarm. The alarm logic is controlled by the MCU control unit. During an alarm, power consumption is high, and the voltage may drop suddenly. Without power compensation, the detection device may restart or malfunction due to insufficient power supply. The MCU control unit is connected to the sensing unit through a circuit conditioning unit for acquiring analog signals after signal conditioning. The detector's communication circuit can be a fire alarm bus, RS485, CAN bus, or a 4-20mA communication circuit. The RS485 bus communication circuit is model ISO3082, and the 4-20mA communication circuit is model XTR111. The detector's alarm output circuit includes a parallel flashing light and a buzzer, which can be driven by a chip or by control pulses from an MCU control unit. The detector's communication circuit is either an RS485 communication circuit or a 4-20mA communication circuit.

[0032] The MCU control unit monitors the normal operating status of the detector's detection components, including whether they are experiencing alarms. For example, if the detected concentration exceeds the set threshold, an alarm is output. The MCU also receives and processes the detection signals from the sensor unit and controls the detector's communication circuit and alarm output circuit. The MCU control unit handles the logical processing of the collected gas concentration data. If no concentration signal is detected, a sensor unit fault is reported. An abnormal communication in the detector's communication circuit is reported as an abnormal operating state. An alarm is triggered, and insufficient power supply voltage will also trigger a corresponding alarm, which is then transmitted to the higher-level monitoring system (host computer). An alarm triggers an audible and visual alarm, with different indicator lights flashing at different frequencies. However, alarms and communication can affect the power supply voltage; therefore, the detection device is activated to compensate for power supply voltage during alarms and communication.

[0033] Figure 2 As shown, this utility model provides an external power supply detection and self-compensation control circuit for implementing a detection device with power supply self-compensation: The symbols are explained as follows: Vb_IN is the battery voltage of the energy storage unit; VIN is the supply voltage of the external power supply; VCC_B0 is the output voltage of the energy storage unit; VDD is the output voltage of the detector power supply management circuit. BT0 is the lithium battery, F10 is the fuse (negative terminal of the lithium battery), and the positive terminal of the lithium battery is connected to the external power supply control switch through the fuse and the energy storage unit charge / discharge management circuit.

[0034] like Figure 4 As shown, the energy storage unit's charge / discharge management circuit includes a protection chip U61, model CN3152A, which provides protection against charging / discharging, overvoltage, and overcharge. The TEMP and GND pins of the protection chip U61 are grounded. The TEMP pin is the battery temperature detection input. The input pin VIN of the protection chip U61 is connected to both the external power supply and one end of capacitor C61. The other end of capacitor C61 is grounded. Capacitor C61 acts as a filter capacitor to prevent fluctuations in the external power supply voltage VIN from affecting the protection chip U61. The VIN pin is the positive input voltage. A TVS diode D61 is connected in parallel across the external power supply. The TVS diode D61 prevents the input voltage VIN from exceeding the operating voltage of the protection chip U61. If a TVS33 is selected, it ensures the input voltage is below 33V. The CE pin of the protection chip U61 is connected to the external power supply; the CE pin is the chip's enable input. The CHRG pin of the protection chip U61 is connected to the positive terminal of the lithium battery through resistor R62, and the DONE pin of the protection chip U61 is also connected to the positive terminal of the lithium battery through resistor R61. Both resistors R61 and R62 are pull-up resistors, pulling up the two charging states. The CHRG pin indicates the charging status, and the DONE pin indicates the charging completion status. The CHRG pin of the protection chip U61 outputs the charging status CHG_INFO, and the DONE pin outputs the charging status CHG_INFI. These two charging status outputs are connected to indicator lights of different colors to indicate charging in progress and charging completion, respectively. The BAT pin of the protection chip U61 is grounded through the parallel capacitor C62 and TVS diode D62. The BAT pin of the protection chip U61 outputs a stable battery voltage Vb_IN. The capacitor C62 is a filter capacitor, and the TVS diode D62 prevents the output battery voltage Vb_IN from being too high due to circuit faults. For example, if the TVS is 4.5, it ensures that the battery voltage Vb_IN is below 4.5V.

[0035] The external power supply detection circuit includes transistor Q15. The collector of transistor Q15 is grounded. The base of transistor Q15 is connected to one end of resistors R14 and R15 via resistor R16. The other end of resistor R15 is grounded. The other end of resistor R14 is connected to the external power supply interface. Transistor Q15 is an NPN transistor. The functions of resistors R14, R16, and R15 are all current limiting, transmitting the supply voltage VIN to transistor Q15 and controlling whether transistor Q15 is turned on. The emitter of transistor Q15 is connected to the external power supply control switch. The external power supply control switch includes a MOSFET Q16, which is a P-MOS transistor. The source of MOSFET Q16 is connected to one end of resistor R17 and the output terminal of the energy storage unit's charge / discharge management circuit. The gate of MOSFET Q16 is connected to the emitter of transistor Q15. A diode is connected in anti-parallel between the source and drain of MOSFET Q16. This diode is a parasitic diode used for freewheeling and protection functions, especially in the case of inductive loads in subsequent circuits, where it can quickly discharge and prevent voltage buffering. The drain of MOSFET Q16 is connected to an undervoltage control switch, and the emitter of transistor Q15 is connected to the other end of resistor R17. Resistor R17 acts as a pull-up resistor. If there is no supply voltage VIN or the supply voltage VIN is at a critical state, transistor Q15 will switch on and off repeatedly, and MOSFET Q16 (P-MOS) will also switch on and off accordingly. However, MOSFET Q16 typically has internal parasitic capacitance. Without the rapid pull-up resistor R17, there might be a slight delay in the turn-on and turn-off of MOSFET Q16, affecting the self-compensation power supply effect. The battery voltage Vb_IN provides the pull-up voltage for resistor R17. When there is no external power supply, i.e., when the supply voltage VIN is zero (VIN=0), the base voltage of transistor Q15 is 0 due to the pull-down effect of resistor R15, and transistor Q15 does not conduct. At this time, MOSFET Q16 is pulled up by the high level of resistor R17, and the gate of MOSFET Q16 is high, so MOSFET Q16 does not conduct. Regardless of whether the switching transistors of the undervoltage control switch and the energy storage unit power supply control switch, i.e., MOSFETs Q11 and Q31, are conducting, the lithium battery BTO will not self-discharge. The output voltage VCC_B0 cannot be obtained from the battery voltage Vb_IN. That is, in the absence of external power supply, the lithium battery BTO is protected from self-discharge, the energy storage unit cannot supply power to the detector detection component, and the detector detection component is protected and cannot work. When an external power supply is available, the supply voltage VIN is transmitted to the base of transistor Q15. As long as the voltage applied to the base of transistor Q15 is greater than 0.7V, transistor Q15 is in the saturation region and conducts (the voltage drop of 0.7V is negligible). At this time, the gate of MOSFET Q16 is low, and MOSFET Q16 conducts. Then, a comparison is made to determine whether the external power supply has line loss and voltage drop that does not meet the threshold requirement, thereby controlling whether to start low-voltage power supply.

[0036] The low-voltage detection circuit includes a Zener diode D10 and a transistor Q10. The external power supply interface, i.e., the supply voltage VIN, is connected to the anode of the Zener diode D10. The cathode of the Zener diode D10 is connected to one end of resistors R10 and R11, respectively. The other end of resistor R10 is grounded, acting as a pull-down resistor. The other end of resistor R11 is connected to the base of transistor Q10. Resistor R12 acts as a pull-up resistor, similar to the function of resistor R17. The collector of transistor Q10 is grounded. Transistor Q10 is an NPN transistor, and its emitter is connected to an undervoltage control switch. The undervoltage control switch includes a MOSFET Q11, which is an N-MOS transistor and acts as a switch. It turns on when the external voltage is detected to be below 20V. The gate of MOSFET Q11 is connected to the emitter of transistor Q10. The emitter of transistor Q10 is connected to one end of resistor R12. The other end of resistor R12 and the drain of MOSFET Q11 are both connected to the drain of MOSFET Q16. Resistor R12 acts as a pull-up resistor. The source of MOSFET Q11 is connected to the power supply control switch of the energy storage unit. The forward voltage of Zener diode D10 is 20V. Zener diode D10 has a clamping effect. When the base voltage of transistor Q10 is VIN-20 > 0.7, the external power supply is considered normal, and transistor Q10 conducts, controlling the switching of MOSFET Q11. For lithium battery power, MOSFETs Q16 / Q11 / Q31 all need to be turned on. The logic is: there must be an external power supply, the external power supply threshold must be lower than a set threshold, and the battery itself must have sufficient charge before lithium battery power is supplied.

[0037] The energy storage voltage detection circuit includes a Zener diode D30 and a transistor Q30. The battery voltage output from the energy storage unit's charge and discharge management circuit is connected to the positive terminal of the Zener diode D30. The forward voltage of the Zener diode D30 is 3.3V. The negative terminal of the Zener diode D30 is connected to one end of resistors R30 and R31, respectively. The other end of resistor R30 is grounded, and resistor R30 acts as a pull-down resistor. The other end of resistor R31 is connected to the base of transistor Q30, and resistor R31 limits current. The collector of transistor Q30 is grounded, and the emitter of transistor Q30 is connected to the input terminal of the energy storage unit's power supply control switch. The power supply control switch for the energy storage unit includes a MOSFET Q31, which is a P-MOSFET. The gate of MOSFET Q31 is connected to the emitter of transistor Q30. The emitter of transistor Q30 is connected to one end of resistor R32, and the other end of resistor R32 is connected to the source of both MOSFET Q11 and MOSFET Q31. Resistor R32 acts as a pull-up resistor, providing the drain of MOSFET Q31 with the output voltage VCC_B0. When the battery voltage Vb_IN is greater than 4V (turn-on voltage 3.3V + transistor Q30 voltage drop 0.7V), transistor Q30 turns on, the gate voltage of MOSFET Q31 is 0, and MOSFET Q31 turns on.

[0038] The on / off condition of MOSFET Q31 is determined by MOSFET Q16 (whether there is an external power supply) and MOSFET Q11 (whether the external power supply is at a low voltage). In other words, the energy storage unit is only activated to supply power when there is an external power supply and the voltage is low, thus achieving self-detection and self-compensation. When the detector detects alarms or communication components, a momentary lack of external power supply will cause the external power supply voltage VIN to drop.

[0039] like Figure 3As shown, the voltage detection circuit includes a Zener diode D50 and a transistor Q50. The foot pressure control switch includes a MOSFET Q51. A capacitor C50 is connected in parallel across the two ends of the external power supply. The function of capacitor C50 is to filter and prevent slight fluctuations in the supply voltage VIN from affecting the subsequent power supply. The external power supply interface, i.e., the supply voltage VIN, is connected to the positive terminal of the Zener diode D50. The negative terminal of the Zener diode D50 is connected to one end of resistor R51 and one end of resistor R50. The other end of resistor R50 is grounded. The function of resistor R50 is to pull down the voltage. The other end of resistor R51 is connected to the base of transistor Q50. The collector of transistor Q50 is grounded. The emitter of transistor Q50 is connected to one end of resistor R52 and the gate of MOSFET Q51. The other end of resistor R52 and the source of MOSFET Q51 are connected to the external power supply interface. MOSFET Q51 is a P-MOSFET. The function of resistor R52 is to pull up the voltage. The drain of MOSFET Q51 is connected to one end of capacitor C51 and the detector power supply management circuit. The other end of capacitor C51 is grounded. The function of capacitor C51 is to filter the voltage to prevent slight fluctuations in the output voltage VDD.

[0040] like Figure 3 As shown, the Zener diode D50 has a voltage regulation function. If the supply voltage VIN is lower than the Zener diode D50's regulation voltage of 20V, the Zener diode D50 cannot conduct. With resistor R50 pulling it down, the base of transistor Q50 is at a low level (0), and transistor Q50 does not conduct. If the supply voltage VIN is higher than 20V, it is determined whether VIN-20 is greater than the conduction voltage of transistor Q50 (0.7V). If it is greater than 0.7V, transistor Q50 conducts, thereby driving MOSFET Q51 (P-MOS) to conduct. This achieves the goal that when the supply voltage VIN is sufficient, MOSFET Q51 conducts, and after passing through diode D51 in the detector power management circuit, it provides the output voltage VDD to power the detector's detection components.

[0041] The detector power supply management circuit includes diodes D51 and D21. The anode of diode D51 is connected to the drain of MOSFET Q51, and the cathode of diode D51 receives the output voltage VDD. The anode of diode D21 is connected to the output terminal of the energy storage unit voltage conditioning circuit, and the cathode of diode D21 receives the output voltage VDD.

[0042] The energy storage unit voltage conditioning circuit includes a power processing chip U20, which is a boost chip of model SX1308, to boost the battery voltage to the required output voltage VDD. The input pin IN of the power processing chip U20 is connected to the drain of MOSFET Q31 to obtain the output voltage VCC_B0. The enable pin EN of the power processing chip U20 is connected to one end of resistor R23 and one end of capacitor C21, with the other end of capacitor C21 grounded. Capacitor C21 charges instantly upon startup of the power processing chip U20 to prevent the chip from being impacted by the instantaneous startup of the enable pin EN. The other end of resistor R23 is connected to the drain of MOSFET Q31, and resistor R23 acts as a pull-up resistor. A capacitor C22 is connected in parallel between the other end of resistor R23 and the other end of capacitor C21. Capacitor C22 acts as a filter to prevent power fluctuations caused by the instantaneous startup of the output voltage VCC_B0. The function of resistor R23 and capacitor C21 is to delay startup, typically on the order of milliseconds. The GND pin of the power processing chip U20 is grounded. An inductor L20 is connected between the input pin and the SW pin of the power processing chip U20. The inductor L20 stores and releases electrical energy, converting low-voltage DC to high-voltage DC through a charging and discharging process. It is the core component of the boost circuit to achieve voltage boosting. The SW pin is the voltage output pin. The SW pin of the power processing chip U20 is connected to the positive terminal of the Schottky diode D20. The negative terminal of the Schottky diode D20 is connected to one end of resistor R21 and one end of capacitor C20. The Schottky diode D20 prevents reverse and backflow current. The other end of resistor R21 is connected to the FB pin of the power processing chip U20 and one end of resistor R22. The other end of resistor R22 is grounded. Resistors R22 and R21 are feedback resistors, determining the output voltage through feedback. The relationship is Vout = 0.6 * (1 + R21 / R22). The other end of capacitor C20 is grounded. The function of capacitor C20 is filtering to prevent voltage fluctuations. The negative terminal of Schottky diode D20 is connected to the positive terminal of diode D21 in the detector power supply management circuit.

[0043] The energy storage unit voltage conditioning circuit is a boost circuit. The boost voltage level is related to the values ​​of resistors R21 and R22. The output voltage VDD is Vout = Vref * (1 + R21 / R22) where Vref is the output voltage of the power processing chip U20. The input of the energy storage unit voltage conditioning circuit is the output voltage VCC_B0, which comes from the output of the energy storage unit power supply control switch. After the output of the energy storage unit voltage conditioning circuit is integrated and self-compensated by the Zener diode D21 of the detector power supply management circuit, it provides a stable power supply voltage, i.e., the output voltage VDD, to the subsequent detector detection components.

[0044] When an external power supply is available, but the supply voltage VIN is insufficient (i.e., the supply voltage VIN cannot directly meet the operating requirements of the detector's detection components; assuming the supply voltage VIN is below the set low voltage threshold of 20V, the detector's detection components cannot operate normally), transistor Q15 conducts normally, and MOSFET Q16 conducts at a low level. Transistor Q10 is not conducting due to the clamping effect of Zener diode D10, and MOSFET Q11 conducts due to the high level pull-up of resistor R12, making its gate voltage high. Zener diode D30 determines that the energy storage unit is not underpowered, driving transistor Q30 to conduct, and MOSFET Q31 to conduct. The output voltage VCC_B0 can be output through the power processing chip U20 to provide the required output voltage VDD for the detector's detection components. NPN transistor Q50 is not conducting due to the clamping effect of Zener diode D50, and P-MOSFET Q50 is not conducting due to the high level pull-up of resistor R52. In other words, when the external power supply is insufficient, the lithium battery of the storage unit powers the detector's detection components, thus performing self-compensation for power supply issues.

[0045] When an external power supply is available and sufficient (i.e., the supply voltage VIN is sufficient for the detector's detection components to operate normally, assuming the supply voltage VIN is higher than 20V for the detector's detection components to operate normally), P-MOS transistor Q16 is turned on, NPN transistor Q50 is turned on due to being clamped by Zener diode D50, and P-MOS transistor Q51 is turned on at a low level. The supply voltage VIN supplies power to the detector's detection components through P-MOS transistor Q51 and diode D51. When the supply voltage is higher than 20V, transistor Q10 is turned on, and the gate of N-MOS transistor Q11 is at a low level. At this time, N-MOS transistor Q11 is not turned on, and the energy storage unit is cut off. That is, one of the MOS transistors Q16, Q11, and Q31 is not turned on, and the lithium battery's output voltage VCC_BO is not transmitted to the power management unit. In other words, when the external power supply voltage is sufficient, the external power supply supplies power to the detector's detection components, and the energy storage unit is in a charging state. The lithium battery can be charged by connecting it to an external power source through the energy storage unit's charge and discharge management circuit. The energy storage unit's charge and discharge management circuit has built-in charging protection function and status indication output function.

[0046] Example 2 like Figure 5 As shown, a compensation method for a detection device with a self-compensating power supply function is disclosed. The self-compensating power supply unit automatically determines and supplies power to the detector's detection component through the energy storage unit by detecting the external power supply and its own power level, thereby achieving automatic compensation. The specific implementation steps of this utility model are as follows: Step S1: The external power supply detection circuit detects and determines whether an external power supply is connected. Step S2: Based on the result of step S1, if the external power supply is connected, the external power supply control switch is turned on, and the energy storage unit charging and discharging management circuit starts to work, and the low voltage detection circuit determines whether the power supply voltage of the external power supply is higher than the working voltage threshold of the sensor unit.

[0047] exist Figure 2 In this circuit, the external power supply is connected through the external power supply interface. When the voltage is greater than the turn-on voltage of transistor Q15, the MOSFET Q16 of the external power supply control switch is turned on. At the same time, the supply voltage VIN of the external power supply is transmitted to the energy storage unit charge and discharge management circuit, and the energy storage unit charge and discharge management circuit starts to work, charging the lithium battery through the external power supply.

[0048] For example, the forward voltage of the Zener diode D30 in the energy storage voltage detection circuit is 3.3V. The normal voltage of the lithium battery is 4V. If it is lower than 3.3V, it is considered that the lithium battery is low on power. At this time, Vb_IN-3.3=0.7V. Only when Vb_IN>4V will the base voltage of the transistor Q30 be greater than 0.7V, and the transistor Q30 will conduct, driving the P-MOS transistor Q31 to conduct.

[0049] By utilizing the clamping effect of the Zener diode D10 in the low-voltage detection circuit (which turns on the N-MOS transistor when the voltage is below the threshold) and the Zener diode D50 in the voltage detection circuit (which turns on the P-MOS transistor when the voltage is above the threshold), the system determines whether the supply voltage of the external power supply is higher than the operating voltage threshold of the sensor unit. When the supply voltage of the external power supply is higher than 20V, the Zener diode D50 conducts; otherwise, the Zener diode D50 does not conduct.

[0050] Step S3: Based on the result of step S2, if the supply voltage of the external power supply is higher than the operating voltage threshold of the sensor unit, the pressure control switch is turned on, while the undervoltage control switch is not turned on. At this time, the external power supply supplies power to the detector's detection component. That is, when the external power supply is sufficient (above the threshold), only the external power supply supplies power to the detection device, while the energy storage unit is in a charging state.

[0051] When the external power supply voltage VIN is higher than the sensor unit's operating voltage threshold, transistor Q50 and MOSFET Q51 are turned on. The external power supply voltage VIN is supplied to the detector's detection component through MOSFET Q51 and diode D51. At this time, MOSFET Q11 is not turned on, the battery voltage Vb_IN cannot be transmitted to the MOSFET, and the output voltage VCC_B0 cannot be obtained.

[0052] Step S4: Based on the result of step S2, if the external power supply voltage is lower than the sensor unit's operating voltage threshold, the undervoltage control switch is activated. When the energy storage unit has sufficient power, the energy storage unit's charge / discharge management circuit activates the energy storage unit's power supply control switch. The energy storage unit's voltage conditioning circuit adjusts the energy storage unit's output voltage to the sensor unit's operating voltage and transmits this power to the detector's detection component via the power supply management circuit for automatic compensation. This ensures that in the event of an external power supply undervoltage (below the threshold), the energy storage unit supplies power to the detector's detection component to maintain stable operation.

[0053] When the external power supply voltage VIN is below 20V, transistor Q10 is not conducting. At this time, it is pulled up by resistor R12, and the gate of N-MOSFET Q11 is high, so MOSFET Q11 conducts. When the external power supply voltage VIN is below 20V, due to the Zener diode D50 clamping at 20V (ignoring the transistor's 0.7V), it is pulled down by resistor R50, and the base of transistor Q50 is low, so transistor Q50 is not conducting. At this time, the gate of P-MOSFET Q51 is high, so MOSFET Q51 is not conducting. When the external power supply voltage is below the sensor unit's operating voltage threshold, MOSFET Q51 is off, and MOSFET Q11 is on. At this time, because of the external power supply, MOSFET Q16 is on. When the lithium battery is fully charged, MOSFET Q31 is on, and the battery voltage Vb_IN can be transmitted to MOSFET Q31 to obtain the output voltage VCC_B0. After being boosted by the power processing chip U20, it supplies power to the detector's detection components. No compensation will be provided when the lithium battery is low on charge.

[0054] Step S5: Based on the result of step S1, if no external power supply is connected, the external power supply control switch will not be turned on, and the energy storage unit power supply control switch will not be turned on. Because the energy storage unit power supply control switch is not turned on, the energy storage unit will not self-discharge to power the sensing unit of the detector's detection component. This ensures that the detector's detection component will not malfunction in the absence of an external power supply.

[0055] In the above steps, the energy storage unit control switch is connected to the MCU control unit. The status information of the energy storage unit control switch needs to be read by the MCU control unit to record whether the detection unit is using an external power supply or the energy storage unit when it is working, which is equivalent to a record or filing. The MCU control unit obtains the voltage of MOSFET Q31 through switch quantity detection to determine whether MOSFET Q31 is conducting, thereby knowing whether the lithium battery is powering the detector detection component.

[0056] By following steps S1 to S5 above, the detector detection component can operate stably and reliably through automatic compensation, regardless of whether the external power supply is undervoltage.

[0057] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A detection device with power supply self-compensation function, characterized in that, The device includes a housing, inside which are a detector detection component, an energy storage unit, and a power supply self-compensation unit. The power supply self-compensation unit is connected to the energy storage unit, and both the energy storage unit and the power supply self-compensation unit are connected to a power supply management circuit, which is connected to the detector detection component.

2. The detection device with power supply self-compensation function according to claim 1, characterized in that, The power supply self-compensation unit includes an external power supply detection circuit, an external power supply control switch, a low voltage detection circuit, an undervoltage control switch, a voltage detection circuit, a foot pressure control switch, an energy storage unit charging and discharging management circuit, an energy storage unit power supply control switch, and an energy storage unit voltage conditioning circuit. The external power supply is connected to the voltage detection circuit through an external power supply interface, the voltage detection circuit is connected to the foot pressure control switch, and the foot pressure control switch is connected to the power supply management circuit. The lithium battery of the energy storage unit is connected to the energy storage unit charge / discharge management circuit, which is connected to the energy storage voltage detection circuit. The energy storage voltage detection circuit is connected to the energy storage unit power supply control switch. The external power supply interface is connected to the energy storage unit charge / discharge management circuit, the external power supply detection circuit, and the low voltage detection circuit. The external power supply detection circuit and the energy storage unit charge / discharge management circuit are both connected to the external power supply control switch. The external power supply control switch is connected to the undervoltage control switch. The low voltage detection circuit is connected to the undervoltage control switch. The undervoltage control switch is connected to the energy storage unit power supply control switch. The energy storage unit power supply control switch is connected to the power supply management circuit through the energy storage unit voltage conditioning circuit.

3. The detection device with power supply self-compensation function according to claim 2, characterized in that, The energy storage unit is a lithium battery, which is connected to the power supply self-compensation unit; The detector detection component includes an MCU control unit, a sensing unit, and a circuit conditioning unit. The sensing unit is connected to the circuit conditioning unit, and the circuit conditioning unit is connected to the MCU control unit. The MCU control unit is connected to both the detector communication circuit and the detector alarm output circuit. The power management circuit is connected to the sensing unit, the MCU control unit, the detector communication circuit, and the detector alarm output circuit.

4. The detection device with power supply self-compensation function according to claim 3, characterized in that, The circuit conditioning unit includes an operational amplifier circuit and an ADC analog-to-digital converter connected in sequence. The operational amplifier circuit is connected to the output terminal of the sensor unit, and the ADC analog-to-digital converter is connected to the MCU control unit. The power supply control switch of the energy storage unit is connected to the MCU control unit.

5. The detection device with power supply self-compensation function according to any one of claims 2-4, characterized in that, The energy storage unit's charge and discharge management circuit includes a protection chip U61. The TEMP and GND pins of the protection chip U61 are both grounded. The input pin VIN of the protection chip U61 is connected to an external power supply and one end of capacitor C61, with the other end of capacitor C61 grounded. The enable pin CE of the protection chip U61 is connected to the positive terminal of the external power supply, and the negative terminal of the external power supply is grounded. A TVS diode D61 is connected in parallel across the two ends of the external power supply. The CHRG pin of the protection chip U61 is connected to the positive terminal of the lithium battery in the energy storage unit through a resistor R62. The DONE pin of the protection chip U61 is also connected to the positive terminal of the lithium battery through a resistor R61. The BAT pin of the protection chip U61 is grounded through the parallel capacitor C62 and the TVS diode D62. The BAT pin of the protection chip U61 outputs the battery voltage Vb_IN of the energy storage unit.

6. The detection device with power supply self-compensation function according to claim 5, characterized in that, The external power supply detection circuit includes a transistor Q15. The collector of transistor Q15 is grounded, and the base of transistor Q15 is connected to one end of resistors R14 and R15 respectively through resistor R16. The other end of resistor R15 is grounded, and the other end of resistor R14 is connected to the external power supply interface. The emitter of transistor Q15 is connected to the external power supply control switch; The external power supply control switch includes a MOSFET Q16. The source of the MOSFET Q16 is connected to one end of the resistor R17 and the output terminal of the energy storage unit charge and discharge management circuit, respectively. The gate of the MOSFET Q16 is connected to the emitter of the transistor Q15. The drain of the MOSFET Q16 is connected to the undervoltage control switch. The emitter of the transistor Q15 is connected to the other end of the resistor R17. The low voltage detection circuit includes a Zener diode D10 and a transistor Q10. The external power supply interface is connected to the positive terminal of the Zener diode D10. The negative terminal of the Zener diode D10 is connected to one end of resistor R10 and one end of resistor R11. The other end of resistor R10 is grounded. The other end of resistor R11 is connected to the base of transistor Q10. The collector of transistor Q10 is grounded. The emitter of transistor Q10 is connected to the undervoltage control switch. The undervoltage control switch includes a MOSFET Q11. The gate of the MOSFET Q11 is connected to the emitter of the transistor Q10. The emitter of the transistor Q10 is connected to one end of a resistor R12. The other end of the resistor R12 and the drain of the MOSFET Q11 are both connected to the drain of the MOSFET Q16. The source of the MOSFET Q11 is connected to the power supply control switch of the energy storage unit. The energy storage voltage detection circuit includes a Zener diode D30 and a transistor Q30. The output terminal of the energy storage unit charge and discharge management circuit is connected to the positive terminal of the Zener diode D30. The negative terminal of the Zener diode D30 is connected to one end of resistor R30 and one end of resistor R31. The other end of resistor R30 is grounded. The other end of resistor R31 is connected to the base of transistor Q30. The collector of transistor Q30 is grounded. The emitter of transistor Q30 is connected to the input terminal of the energy storage unit power supply control switch. The power supply control switch of the energy storage unit includes a MOSFET Q31. The gate of the MOSFET Q31 is connected to the emitter of the transistor Q30. The emitter of the transistor Q30 is connected to one end of a resistor R32. The other end of the resistor R32 is connected to the source of the MOSFET Q11 and the source of the MOSFET Q31 respectively. The drain of the MOSFET Q31 receives the output voltage VCC_B0 of the energy storage unit. The voltage detection circuit includes a Zener diode D50 and a transistor Q50. An external power supply is connected to the positive terminal of the Zener diode D50. A capacitor C50 is connected in parallel across the two ends of the external power supply. The negative terminal of the Zener diode D50 is connected to a resistor R51 and one end of a resistor R50. The other end of the resistor R50 is grounded. The other end of the resistor R51 is connected to the base of the transistor Q50. The collector of the transistor Q50 is grounded. The emitter of the transistor Q50 is connected to the foot pressure control switch. The foot pressure control switch includes a MOSFET Q51. The emitter of the transistor Q50 is connected to one end of the resistor R52 and the gate of the MOSFET Q51, respectively. The other end of the resistor R52 and the source of the MOSFET Q51 are connected to the positive terminal of the external power supply. The negative terminal of the external power supply is grounded. The drain of the MOSFET Q51 is connected to one end of the capacitor C51 and the detector power supply management circuit, respectively. The other end of the capacitor C51 is grounded.

7. The detection device with power supply self-compensation function according to claim 6, characterized in that, Transistor Q15 is an NPN transistor, and MOSFET Q16 is a P-MOS transistor; transistor Q10 is an NPN transistor, and MOSFET Q11 is an N-MOS transistor; transistor Q30 is an NPN transistor, and MOSFET Q31 is a P-MOS transistor; transistor Q50 is an NPN transistor, and MOSFET Q51 is a P-MOS transistor. A diode is connected in anti-parallel between the source and drain of each of the MOSFETs Q16, Q11, Q31, and Q51.

8. The detection device with power supply self-compensation function according to claim 6, characterized in that, The energy storage unit voltage conditioning circuit includes a power processing chip U20. The input pin IN of the power processing chip U20 is connected to the drain of the MOSFET Q31, which is the power supply control switch for the energy storage unit. The enable pin EN of the power processing chip U20 is connected to one end of resistor R23 and one end of capacitor C21. The other end of capacitor C21 is grounded. The other end of resistor R23 is connected to the drain of MOSFET Q31. A capacitor C22 is connected in parallel between the other end of resistor R23 and the other end of capacitor C21. The GND pin of the power processing chip U20... The power processing chip U20 is grounded, and an inductor L20 is connected between its input pin IN and pin SW. Pin SW of the power processing chip U20 is connected to the positive terminal of Schottky diode D20. The negative terminal of Schottky diode D20 is connected to one end of resistor R21 and one end of capacitor C20. The other end of resistor R21 is connected to pin FB of the power processing chip U20 and one end of resistor R22. The other end of resistor R22 is grounded, and the other end of capacitor C20 is grounded. The negative terminal of Schottky diode D20 is connected to the detector power management circuit.

9. The detection device with power supply self-compensation function according to any one of claims 2, 3, 6, 7, and 8, characterized in that, The power supply management circuit includes a detector power supply management circuit, which is connected to the foot pressure control switch and the energy storage unit voltage conditioning circuit. The detector power supply management circuit is also connected to the MCU control unit, the sensing unit, and the detector communication circuit. The MCU control unit is connected to the detector communication circuit and the detector alarm output circuit.

10. The detection device with power supply self-compensation function according to claim 9, characterized in that, The detector power supply management circuit includes diodes D51 and D21. The anode of diode D51 is connected to the drain of MOS transistor Q51 of the foot pressure control switch, and the anode of diode D21 is connected to the cathode of Schottky diode D20 of the energy storage unit voltage conditioning circuit. Both the cathodes of diodes D51 and D21 receive the power supply voltage from the detector detection component.

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