Negative pressure weighing chamber FFU group control system and power supply module

Abstract

The utility model relates to a negative pressure weighing chamber FFU group control system and a power supply module, a main power supply module PWR1 selects a linear power supply and stably supplies power to an external function board module, the positive electrode of the main power supply module PWR1 is connected with the input end of an electronic switch SW1 through a wire, and the negative electrode is connected with the negative electrode of a function board; the redundant backup power supply module PWR2 adopts a storage battery, and the negative electrode is connected with the negative electrode of the function board. The voltage sensor VT is an INA219 sensor and accurately measures PWR1 voltage, the microcontroller selects STM32 and controls on-off of the electronic switches SW1 and SW2 according to sensor information, the electronic switches SW1 and SW2 select N-channel MOS field effect transistors, and a 1N4007 protection diode is further arranged to prevent current reversal. After the system is initialized, the PWR1 supplies power normally, and the PWR2 is switched to quickly when the voltage is abnormal, so that uninterrupted power supply is ensured, and the system has the advantages of high stability, accurate monitoring, quick switching and the like, and meets the strict requirements of the negative pressure weighing chamber.

Description

TECHNICAL FIELD

[0001] The utility model relates to FFU group control system technical field, especially a kind of negative pressure weighing chamber FFU group control system and power module. BACKGROUND

[0002] The Chinese meaning of FFU is fan filter unit, which has the advantages of long working time, low noise, maintenance-free, small vibration, stepless speed regulation, uniform wind speed, easy installation, etc., and can be used in modular connection. It is widely used in clean room, clean bench, clean production line, assembled clean room and local hundred-level clean workshop.

[0003] A negative pressure weighing chamber is disclosed in Chinese patent, with authorization announcement No.CN220252434U. The FFU group control system involved in this patent includes a touch screen module and a function board module. The touch screen module and the function board module are connected bidirectionally through a wire. The function board module includes a power module, a first function board communication module, an MCU module and a second function board communication module. The power module supplies power to the function board module and the touch screen module through the wire. The first function board communication module realizes communication function with the touch screen module through the wire, uploads information and receives instructions issued by the touch screen module. The first function board communication module is bidirectionally connected with the MCU module, and the second function board communication module is bidirectionally connected with the MCU module. Although intelligent control is achieved to some extent, the power supply only relies on a single power module. In actual production process, once the main power module encounters power fluctuation impact, internal component aging damage, accidental short circuit and other faults, the whole FFU group control system will stop working immediately. UTILITY MODEL CONTENT

[0004] The utility model provides a kind of negative pressure weighing chamber FFU group control system and power module to solve the problem that power supply only relies on single power module in prior art.

[0005] The technical scheme adopted by the utility model is as follows:

[0006] A power module of a negative pressure weighing chamber FFU group control system includes:

[0007] A main power module PWR1 is used to supply power to an external function board module. The positive pole of the main power module PWR1 is connected with the positive pole of the external function board module. The negative pole of the main power module PWR1 is connected with the negative pole of the external function board module.

[0008] An electronic switch SW1 is connected with the positive pole of the main power module PWR1 at the input end. The output end of the electronic switch SW1 is connected with the positive pole of the external function board module.

[0009] a voltage sensor VT for measuring the voltage of the main power module PWR1, IN+ of the voltage sensor VT is connected with the positive pole of the main power module PWR1; IN- of the voltage sensor VT is connected with the negative pole of the main power module PWR1;

[0010] a redundant backup power module PWR2, the negative pole of the redundant backup power module PWR2 is connected with the negative pole of the external function board module;

[0011] an electronic switch SW2, the input end of the electronic switch SW2 is connected with the positive pole of the redundant backup power module PWR2; the output end of the electronic switch SW2 is connected with the positive pole of the external function board module;

[0012] a microcontroller, the microcontroller is connected with the communication pin of the voltage sensor VT, the microcontroller receives the information transmitted by the voltage sensor VT, the transmitted information is the voltage of the main power module PWR1; the microcontroller is connected with the gate control of the electronic switch SW1, for controlling the on-off of the electronic switch SW1; the microcontroller is connected with the gate control of the electronic switch SW2, for controlling the on-off of the electronic switch SW2.

[0013] Further, the voltage sensor VT is INA219 sensor.

[0014] Further, the voltage sensor VT is INA219 sensor; IN+ of the INA219 sensor is connected with the positive pole of the main power module PWR1; IN- of the INA219 sensor is connected with the negative pole of the main power module PWR1.

[0015] Further, the electronic switch SW1 is N-channel MOS field effect transistor NMOS1; the drain of the N-channel MOS field effect transistor NMOS1 is the input end of the electronic switch SW1; the source of the N-channel MOS field effect transistor NMOS1 is the output end of the electronic switch SW1; the gate of the N-channel MOS field effect transistor NMOS1 is the gate control of the electronic switch SW1.

[0016] Further, the electronic switch SW2 is N-channel MOS field effect transistor NMOS2; the drain of the N-channel MOS field effect transistor NMOS2 is the input end of the electronic switch SW2; the source of the N-channel MOS field effect transistor NMOS2 is the output end of the electronic switch SW2; the gate of the N-channel MOS field effect transistor NMOS2 is the gate control of the electronic switch SW2.

[0017] Further, the microcontroller is STM32 microcontroller.

[0018] Further, the main power module PWR1 is linear power supply.

[0019] Further, the redundant backup power supply module PWR2 is a battery power supply.

[0020] Further, a protection diode D is further included, which is connected in series between the main power supply module PWR1 and the external function board module, for preventing reverse current flow;

[0021] The anode of the protection diode D is connected with the N-channel MOS field effect transistor NMOS1, and the anode of the protection diode D is connected with the positive electrode of the external function board module.

[0022] Based on the same inventive concept, the application further discloses a negative pressure weighing chamber FFU group control system, which comprises the power supply module.

[0023] The utility model has the advantages of:

[0024] Firstly, the combination of the main power supply and the redundant backup power supply ensures high stability of power supply, effectively prevents system downtime caused by power supply problems, guarantees continuous and stable operation of the FFU, and maintains stable weighing chamber environment. Secondly, the high-precision voltage sensor and the intelligent microcontroller realize accurate power supply monitoring and rapid switching. Thirdly, the efficient electronic switch and the reliable protection diode not only improve the response speed and safety of the power supply module, but also reduce the probability of failure. Overall, the reliability, stability and safety of the system are improved, the strict requirements of the negative pressure weighing chamber are met, the production and experimental risks are reduced, the smooth progress of work is guaranteed, and the work efficiency and quality are improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creating any creative labor.

[0026] Figure 1 The utility model discloses a power supply module circuit diagram. DETAILED DESCRIPTION

[0027] The Chinese meaning of FFU is fan filter unit, which has the advantages of long working time, low noise, maintenance-free, small vibration, stepless speed regulation, uniform wind speed, easy installation, etc. It can be used in modular connection and is widely used in clean room, clean bench, clean production line, assembled clean room and local hundred-level clean workshop.

[0028] A negative pressure weighing chamber is disclosed in a Chinese patent with the publication number CN220252434U. The FFU group control system disclosed in the patent comprises a touch screen module and a function board module. The touch screen module and the function board module are connected bidirectionally through a wire. The function board module comprises a power module, a first function board communication module, an MCU module, and a second function board communication module. The power module supplies power to the function board module and the touch screen module through the wire. The first function board communication module realizes communication function with the touch screen module through the wire, uploads information, and receives instructions issued by the touch screen module. The first function board communication module is bidirectionally connected with the MCU module, and the second function board communication module is bidirectionally connected with the MCU module. Although intelligent control is realized to a certain extent, the power supply only relies on a single power module. In actual production process, once the main power module encounters power fluctuation impact, internal component aging damage, accidental short circuit, and other faults, the entire FFU group control system will stop working immediately.

[0029] The utility model discloses to solve the problem that the fault diagnosis function is lacked in the prior art, and each component of the FFU group control system cannot be monitored in real time, and provides a negative pressure weighing chamber FFU group control system and power module.

[0030] The following disclosure provides examples to realize different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, it is only an example, and the purpose is not to limit the utility model.

[0031] The following is an embodiment of a power module of a negative pressure weighing chamber FFU group control system:

[0032] The circuit diagram of the power module disclosed in the embodiment is shown in the accompanying Figure 1

[0033] The composition of the power module disclosed in the embodiment comprises a main power module PWR1, a redundant backup power module PWR2, a voltage sensor VT, an electronic switch SW1, an electronic switch SW2, a microcontroller, and a protection diode D.

[0034] The following describes each component in detail:

[0035] The main power module PWR1 selects a linear power supply. In the embodiment, a linear power supply with an output voltage of 12V and a rated power of 50W is selected. It has stable output voltage characteristics and can meet the requirements of external function board modules for power supply stability. The positive electrode is connected to the input end of the electronic switch SW1 through a wire, and the negative electrode is connected to the negative electrode of the external function board module through a wire.

[0036] ​The redundant backup power module PWR2 selects a battery power supply. In this embodiment, a lead-acid battery with a rated voltage of 12V and a capacity of 20Ah is selected to provide sufficient backup power when the main power module PWR1 fails. The negative electrode of the battery is connected to the negative electrode of the external function board module.

[0037] The voltage sensor VT selects the INA219 sensor, which has the ability to accurately measure voltage and can accurately feedback the voltage of the main power module PWR1. The IN+ pin of the INA219 sensor is connected to the positive electrode of the main power module PWR1 through a wire, and the IN- pin is connected to the negative electrode of the main power module PWR1, ensuring that the voltage of the main power module can be accurately measured.

[0038] The electronic switch SW1 selects the N-channel MOS field effect transistor NMOS1. In this embodiment, an N-channel MOS transistor with model IRF540 is selected, whose drain is connected to the positive electrode of the main power module PWR1 as an input terminal, whose source is connected to the positive electrode of the external function board module as an output terminal, and whose gate is used as a gate terminal to receive the control signal of the microcontroller.

[0039] The electronic switch SW2 selects the N-channel MOS field effect transistor NMOS2, whose drain is connected to the positive electrode of the redundant backup power module PWR2, whose source is connected to the positive electrode of the external function board module, and whose gate is used to receive the control signal of the microcontroller.

[0040] The microcontroller selects the STM32 microcontroller. In this embodiment, the STM32F407 series is selected, which has rich peripheral interfaces and powerful processing capability, can quickly process the voltage information transmitted by the voltage sensor VT, and accurately control the on-off of the electronic switches SW1 and SW2. The communication pins of the microcontroller are connected to the communication pins of the INA219 sensor through the I2C bus to receive the voltage information of the main power module PWR1; at the same time, the control pins of the microcontroller are connected to the gates of NMOS1 and NMOS2 respectively to realize the control of the electronic switches.

[0041] The protection diode D selects a common silicon diode. In this embodiment, 1N4007 is selected, whose anode is connected to the source of the N-channel MOS field effect transistor NMOS1, that is, connected to the positive electrode of the external function board module, and whose cathode is connected to the positive electrode of the main power module PWR1 to prevent reverse current flow and protect the entire power module and the external function board module.

[0042] The initialization and working process of the power module system disclosed in this embodiment are as follows:

[0043] When the system is powered on, the microcontroller first initializes the configuration of each element, including setting the measurement parameters of the INA219 sensor, initializing the control pin connected to the electronic switch to the default state, etc.

[0044] In normal working state, the microcontroller monitors the voltage of the main power module PWR1 in real time through the INA219 sensor. If the voltage is within the normal range (the normal range set in this embodiment is 11V~13V), the microcontroller keeps the electronic switch SW1 on, so that the main power module PWR1 supplies power to the external function board module. At this time, the electronic switch SW2 is in the off state, and the redundant backup power module PWR2 does not work.

[0045] When the INA219 sensor detects that the voltage of the main power module PWR1 is lower than the set threshold (the threshold set in this embodiment is 10V), the microcontroller quickly sends a control signal to turn on the electronic switch SW2, and after 1S, the microcontroller quickly sends a control signal to turn off the electronic switch SW1, switching the power supply to the redundant backup power module PWR2, ensuring uninterrupted power supply to the external function board module.

[0046] The power module disclosed in this embodiment has the following advantages:

[0047] Excellent stability:

[0048] The main power module PWR1 uses a linear power supply with stable output voltage to provide pure and minimally fluctuating 12V DC power for the external function board module, ensuring the stable operation of sensitive components such as precision sensors and microprocessors, and greatly reducing the risk of signal interference and data error caused by power supply ripple. Even when the grid voltage fluctuates, its stable output characteristics can still ensure the normal operation of the FFU group control system and maintain the environmental control accuracy of the weighing chamber.

[0049] The redundant backup power module PWR2 selects a lead-acid storage battery with a capacity of 20Ah. In the event of a sudden failure of the main power supply, such as power failure, internal component damage of the power module, etc., it can quickly and seamlessly take over the power supply task and provide reliable power support for the system for at least several hours (depending on the load power), effectively preventing problems such as loss of weighing data and loss of control of cleanliness caused by sudden stop of FFU fans due to power failure, and ensuring the continuity of production or experimental processes.

[0050] Precise voltage monitoring and intelligent switching:

[0051] The voltage sensor VT selects the high-precision INA219 sensor, which can track the voltage change of the main power module PWR1 in real time with extremely high precision, and the monitoring capability of millivolt level provides accurate decision basis for the microcontroller. Based on this, the microcontroller can predict potential problems of the power supply in advance, and take corresponding measures when the voltage just appears abnormal trend but has not seriously affected the system operation, such as sending warning notice to maintenance personnel to check the main power supply.

[0052] When the voltage drops to the set threshold (10V), the microcontroller can turn on the electronic switch SW2 and turn off SW1 after turning on SW1, realizing the switching of the main and standby power supply, ensuring that the key functions of the system are not affected, such as the smooth transition of FFU fan speed, maintaining the stable negative pressure environment of the weighing chamber.

[0053] High-efficiency electronic switch guarantee:

[0054] The electronic switches SW1 and SW2 are both N-channel MOS field effect transistors (such as IRF540), which have almost instantaneous response speed compared with traditional mechanical switches, and can complete the on-off action within microseconds.

[0055] At the same time, the low-power characteristic of MOS field effect transistor significantly reduces the additional power consumption in frequent switching operation compared with high-energy mechanical switch, improves the energy utilization efficiency of the whole power module, and reduces the operation cost of the system.

[0056] Strong microcontroller support:

[0057] The STM32F407 series microcontroller easily realizes high-speed I2C bus communication with INA219 sensor, quickly and accurately acquires voltage data, and accurately controls the gate of NMOS1 and NMOS2, ensuring efficient and coordinated operation of the whole power management system.

[0058] Its strong processing capacity can simultaneously handle multiple tasks such as real-time voltage monitoring, switch control, and element state detection, and can also flexibly respond to various complex working conditions according to the preset logic, smoothly switching between different power supply modes, providing a solid "brain" guarantee for the stable power supply of the negative pressure weighing chamber FFU group control system.

[0059] Reliable protection mechanism:

[0060] The protection diode D selects 1N4007 silicon diode, which effectively blocks the possible reverse current, and can ensure that the main power module PWR1, redundant backup power module PWR2 and external function board module are not damaged in the case of abnormal current caused by power connection in reverse or circuit failure, greatly improving the reliability and durability of the whole power system.

[0061] The microcontroller continues the component state monitoring function, can find potential problems such as sensor failure, electronic switch abnormality in time, and take corresponding fault tolerance measures, such as automatic switching of backup components, sending fault alarm and the like, reduce the system downtime caused by single point failure, improve the overall availability of the system.

[0062] In summary, the power module embodiment of the negative pressure weighing chamber FFU group control system provides a stable and reliable, intelligent and efficient power solution for the system through careful selection and collaborative work of each component, which effectively promotes the smooth development of negative pressure weighing chamber related production and experimental activities.

Claims

1. A power module for a negative pressure weighing chamber FFU gang control system, characterized by, The utility model relates to a kind of redundancy backup power supply module and external function board module, comprising: Main power module PWR1, the main power module PWR1 is used to power external function board module;The positive pole of the main power module PWR1 is connected with the positive pole of the external function board module;The negative pole of the main power module PWR1 is connected with the negative pole of the external function board module; Electronic switch SW1, the input end of the electronic switch SW1 is connected with the positive pole of the main power module PWR1;The output end of the electronic switch SW1 is connected with the positive pole of the external function board module; Voltage sensor VT, the voltage sensor VT is used to measure the voltage of the main power module PWR1, the IN+ of the voltage sensor VT is connected with the positive pole of the main power module PWR1;The IN- of the voltage sensor VT is connected with the negative pole of the main power module PWR1; Redundancy backup power module PWR2, the negative pole of the redundancy backup power module PWR2 is connected with the negative pole of the external function board module; Electronic switch SW2, the input end of the electronic switch SW2 is connected with the positive pole of the redundancy backup power module PWR2;The output end of the electronic switch SW2 is connected with the positive pole of external function board module; Microcontroller, the communication pin of the microcontroller is connected with the voltage sensor VT, the microcontroller receives the information transmitted by the voltage sensor VT, and the transmitted information is the voltage of the main power module PWR1;The microcontroller is connected with the gate control of the electronic switch SW1, for controlling the on-off of the electronic switch SW1;The microcontroller is connected with the gate control of the electronic switch SW2, for controlling the on-off of the electronic switch SW2; Wherein, the voltage sensor VT is INA219 sensor;The IN+ of the INA219 sensor is connected with the positive pole of the main power module PWR1;The IN- of the INA219 sensor is connected with the negative pole of the main power module PWR1; Wherein, the electronic switch SW1 is N channel MOS field effect transistor NMOS1; The drain of the N channel MOS field effect transistor NMOS1 is the input end of the electronic switch SW1;The source of the N channel MOS field effect transistor NMOS1 is the output end of the electronic switch SW1;The gate of the N channel MOS field effect transistor NMOS1 is the gate control of the electronic switch SW1; Wherein, the electronic switch SW2 is N channel MOS field effect transistor NMOS2;The drain of the N channel MOS field effect transistor NMOS2 is the input end of the electronic switch SW2;The source of the N channel MOS field effect transistor NMOS2 is the output end of the electronic switch SW2;The gate of the N channel MOS field effect transistor NMOS2 is the gate control of the electronic switch SW2; Wherein, the microcontroller is STM32 microcontroller; Wherein, the main power module PWR1 is linear power supply; Wherein, the redundancy backup power module PWR2 is battery power supply; The protection diode D is connected in series between the main power module PWR1 and the external function board module, for preventing reverse current flow; the anode of the protection diode D is connected with the N-channel MOS field effect tube NMOS1; and the anode of the protection diode D is connected with the positive pole of the external function board module.

2. A negative pressure weighing chamber FFU gang control system, characterized in that, The power module comprises the power module as claimed in claim 1.

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