CN105549485A - Household intelligent power utilization control terminal based on DSP - Google Patents

Abstract

The invention discloses a DSP-based home intelligent power consumption control terminal, comprising: a central processing unit, an information unit, an energy unit, a measurement unit and an interface unit; the central processing unit is respectively connected with the information unit, the energy unit and the measurement unit; The interface unit includes a plug and a socket; the plug and the socket are connected by fire wire, ground wire and neutral wire; the socket is also connected with home appliances; the information unit includes a wifi communication module and a Flash storage module; the Wifi communication module communicates with the cloud server and the The user's mobile terminal APP is connected; the central processing unit of the present invention automatically controls the home appliance power consumption strategy formulated by the optimization algorithm according to the calculation results of the cloud service, the electricity price information and preferential policies issued by the power grid, and does not affect the comfort of the user's power consumption. The start-up time and working hours of each home appliance can be monitored to achieve efficient and intelligent electricity consumption and reduce household energy consumption.

Description

A DSP-based home intelligent power consumption control terminal

technical field

The invention relates to a smart grid, in particular to a DSP-based home smart power consumption control terminal, which belongs to the fields of electric energy monitoring and distributed energy equipment control.

Background technique

The guiding ideology of the smart grid is to emphasize the two-way interaction with user information and electric energy; encourage users to change the traditional electricity consumption mode, actively participate in the grid operation, and adjust the electricity consumption mode according to the real-time electricity price. Smart electricity consumption is an important link in the construction of smart grids. After mastering the electricity consumption rules of users, the power grid company can guide users to use electricity scientifically and rationally and efficiently on the premise of affecting the quality of life of users, reduce household energy consumption, and thus improve residential consumption. electrical efficiency.

Now except for a few home appliances with remote control functions, most home appliances are still uncontrollable; in addition, even for home appliances that can be remotely controlled, if users need to pay attention to the interaction strategy issued by the power grid for manual adjustment every day, this will obviously increase the number of users. Therefore, it is difficult to promote the concept of users participating in the grid operation and adjusting the power consumption mode according to the real-time electricity price.

Contents of the invention

The purpose of the present invention is to provide a DSP-based home intelligent power consumption control terminal, which supports plug-and-play of commonly used home appliances, and uses cloud servers to analyze user behavior patterns and formulate reasonable intelligent power consumption monitoring through accurate user power consumption monitoring. The electricity strategy automatically controls the start-up time and working hours of each home appliance, and realizes the two-way interaction between the power grid and the user's energy-information, so as to optimize the user's electricity consumption efficiency and reduce household energy consumption.

The object of the invention is achieved through the following technical solutions:

A DSP-based home intelligent power consumption control terminal is characterized in that: it includes a central processing unit, an information unit, an energy unit, a measurement unit, and an interface unit; the central processing unit is connected to the information unit, the energy unit, and the measurement unit; the interface unit Connect with the energy unit and the measurement unit respectively;

The central processing unit is a controller with DSP as the core;

The interface unit includes a plug and a socket; the plug and the socket are connected through a live wire, a ground wire and a neutral wire; the plug is also connected to the wiring board; the socket is also connected to the home appliance;

The information unit includes a wifi communication module and a Flash storage module; the Wifi communication module is respectively connected to the cloud server and the user mobile terminal APP through a home router; the Flash storage module is connected to the central processing unit;

The energy unit includes a switch module and a power conversion module; the switch module is mainly composed of a relay, and is connected in series with the live wire of the interface unit; the power conversion module is connected in parallel with the live wire and neutral wire of the interface unit, and the power conversion module includes a resettable fuse, Varistor, AC-DC conversion module and LC filter circuit; the two wiring ports of the AC-DC conversion module are respectively connected to the live wire and the neutral wire of the interface unit, and the line connected to the AC-DC conversion module and the neutral wire is connected in series with the Restoring the fuse, the varistor is connected in parallel between the live line and the neutral line, and the varistor is located between the self-recovering fuse and the current-DC conversion module; the two outlets of the AC-DC conversion module are connected in parallel with the LC filter circuit; the LC filter circuit Including the first filter capacitor, the second filter capacitor, the third filter capacitor and the filter inductor; the first filter capacitor, the second filter capacitor, and the third filter capacitor are connected in parallel, the parallel negative terminal is grounded, and the parallel positive terminal outputs +5V voltage , a filter inductor is connected in series between the positive terminals of the first filter capacitor and the second filter capacitor;

The measuring unit includes a signal conditioning module and an analog-to-digital conversion module; the signal conditioning module is composed of a voltage signal conditioning circuit and a current signal conditioning circuit; the analog-to-digital conversion module is connected between the signal conditioning module and the central processing unit; the voltage signal conditioning circuit includes The first resistor divider resistor, the second divider resistor, the first differential amplifier, the first proportional resistor, the first filter resistor, the first filter capacitor, the first bypass filter capacitor and the third bypass filter capacitor; the first ratio The two ends of the resistor are respectively connected to the two pins of the first differential amplifier; one end of the first voltage dividing resistor and the second voltage dividing resistor are respectively connected to the live line and the neutral line, and the other end is connected to the first differential amplifier in parallel, and the first dividing The outputs of the piezoresistor and the second voltage dividing resistor are connected to the differential amplifier; the first bypass filter capacitor and the third bypass filter capacitor are respectively connected in parallel to the negative and positive power supply terminals of the first differential amplifier; the first filter resistor One end is connected to the first differential amplifier, the other end is connected in parallel to the first filter capacitor, the parallel terminal is connected to the output of the voltage signal conditioning circuit, and the output is directly connected to the analog-to-digital conversion module;

The current signal conditioning circuit includes a current detection resistor, a second differential amplifier, a second proportional resistor, a second filter resistor, a second filter capacitor, a second bypass filter capacitor and a fourth bypass filter capacitor; the current detection resistor is connected in series On the zero line, the two ends of the current-sensing resistor are respectively connected to the two terminals of the second differential amplifier through wiring, and the two ends of the second proportional resistor are respectively connected to the two pins of the second differential amplifier; the second bypass filter capacitor and the fourth bypass filter capacitor are respectively connected in parallel to the negative and positive power supply terminals of the second differential amplifier; one end of the second filter resistor is connected to the second differential amplifier, the other end is connected in parallel to the second filter capacitor, and the parallel terminal is connected to the pressure signal conditioning The output of the circuit is connected, and the output is connected with the analog-to-digital conversion module.

In order to further realize the purpose of the present invention, preferably, the central processing unit is a controller with DSP as the core, and the C2000 system digital signal processor TMS320F28035 chip or TMS320F28027 chip is selected.

Preferably, the Wifi communication module is an integrated communication module based on industrial-grade wireless communication chip CC3200.

Preferably, the Flash storage module is mainly composed of an AT25FS040 chip, and the Flash storage module is connected to the central processing unit by means of 3-wire serial communication, and has a storage space of 4M.

Preferably, the switch module is an HFE20-1-5-1HST-L1 relay with a breaking capacity of 16A.

Preferably, the analog-to-digital conversion module is mainly composed of an integrated analog-to-digital conversion chip MAX1321.

Preferably, the first differential amplifier and the second differential amplifier are INA128 high-precision instrumentation amplifiers.

The central processing unit of the present invention is used to respond to service requests such as information, energy, measurement and optimization units and data processing; the information unit is used to store local user account information and power consumption data, and communicate with the upper cloud server to realize uploading of local data And accept the real-time electricity price, electricity policy and other information issued by the power grid, and at the same time realize the information interaction with the APP installed on the user's mobile terminal; the energy unit is used to realize the energy management of various household appliances, including: the communication of electricity consumption Outage control, overload protection operation, power limit control, etc.; the measurement unit is used to monitor the voltage and current signals of the connected neutral wire, live wire, and ground wire in real time to realize basic power consumption data collection.

When working normally, the interface unit is used to establish the connection between household wall sockets or wiring boards and household appliances; the central processing unit is used to respond to service requests and data processing such as information, energy, measurement, and optimization units; the information unit It is used to store local user account information and electricity consumption data, and communicate with the upper cloud server through the home router to upload local data and receive electricity price information and optimization policies issued by the power grid. information exchange; the energy unit is used to realize the energy management of various household appliances, including: power on-off control, overload protection operation, power limit control, etc.; the measurement unit is used to measure the connected voltage, The current signal is monitored in real time to realize basic electricity consumption data collection.

Compared with the prior art, the present invention has the following advantages:

1) The DSP-based home intelligent power consumption control terminal of the present invention has functions such as measurement, switch control, and wireless communication, and can accurately collect information such as electrical parameters of home appliances and user power consumption, and analyze user power consumption behavior with the help of cloud servers mode and combined with the electricity price information and preferential policies issued by the power grid to formulate a reasonable intelligent power consumption strategy to realize the automatic control of the start-up time and working hours of home appliances, thus solving the problem that users need to manually control home appliances, which greatly facilitates users to participate in the demand side of the power grid Responsive policies can effectively improve the efficiency of users' electricity consumption, reduce household energy consumption, and achieve the purpose of economical electricity consumption.

2) The DSP-based home intelligent power consumption control terminal of the present invention has a built-in integrated power conversion module, which can directly obtain electric energy from 220V mains and supply it to the entire terminal. The integrated power conversion module has the characteristics of small size and low cost, and adopts a switch AC-DC conversion mode, which can convert 220V mains power into 5V DC power at low power consumption. At the same time, the power conversion module uses piezoresistors and thermistors to realize overvoltage and overcurrent protection at the same time, thereby ensuring the safety of the entire DSP-based home intelligent power consumption control terminal.

3) In order to save space, the DSP-based home intelligent power consumption control terminal of the present invention adopts a direct resistance divider voltage acquisition method, and uses an integrated differential operational amplifier instead of a traditional differential operational circuit, thereby reducing the number of devices in the circuit , which is equivalent to reducing the noise source in the signal measurement circuit, thus ensuring the high precision of signal measurement. In addition, traditional power metering equipment measures electricity through an integrated metering chip. This method is limited by the function of the metering chip and generally can only measure basic electricity such as voltage, current, power, electric energy, etc. and cannot achieve flexible harmonic measurement. However, the present invention The advanced signal conditioning method can realize the measurement of various electric quantities.

Description of drawings

FIG. 1 is a schematic diagram of the overall structure of the DSP-based home intelligent power consumption control terminal of the present invention.

FIG. 2 is a schematic diagram of an implementation example of the DSP-based household intelligent power consumption control terminal in FIG. 1 .

FIG. 3 is a circuit diagram of the power conversion module in FIG. 2 .

FIG. 4 is a circuit diagram of voltage signal conditioning in FIG. 2 .

detailed description

In order to better understand the present invention, the present invention will be further described below in conjunction with the accompanying drawings and examples, but the embodiments of the present invention are not limited thereto.

As shown in Figures 1 and 2, a DSP-based home intelligent power consumption control terminal includes a central processing unit 1, an information unit 2, an energy unit 3, a measurement unit 4, and an interface unit 5; the central processing unit 1 is connected to the information unit 2. The energy unit 3 is connected to the measurement unit 4; the interface unit 5 is connected to the energy unit 3 and the measurement unit 4 respectively;

The central processing unit 1 is a controller with DSP as the core, preferably the C2000 system digital signal processor TMS320F28035 chip of TI Company. The chip has a main frequency of up to 60MHz, on-chip 64K memory and 16K cache, and can be used for the development of larger projects; at the same time, compared with other DSP chips, this chip has the characteristics of small size and complete functional peripherals, which is more suitable for the application of the present invention . The central processing unit 1 is connected with the information unit 2, the energy unit 3, and the measurement unit 4 at the same time, and is used for coordinating and controlling the normal operation of each unit, and responding to the service requests of each unit at the same time.

The interface unit 5 includes a plug and a socket; the plug and the socket are connected by three wires of live wire, ground wire and neutral wire; the plug is also connected with the wiring board; Connection of home appliances.

The information unit 2 includes a wifi communication module 21 and a Flash storage module 22; the Wifi communication module 21 is preferably an industrial-grade CC3200 wireless communication chip integrated communication module of TI Company. The Wifi communication module 21 realizes data transmission with the central processing unit 1 through an asynchronous serial port, and the Wifi communication module 21 is respectively connected with the cloud server 7 and the user mobile terminal APP8 through the home router 6, and establishes a data connection with the cloud service by means of wifi wireless networking , where the communication protocol is HTTP. The Flash storage module 22 is mainly composed of an AT25FS040 chip. The Flash storage module 22 is connected to the central processing unit 1, adopts a 3-wire serial communication mode, and has a storage space of 4M. It is mainly used to store local user accounts, router logins, and selected time periods. Internal user electricity consumption data, etc.

The energy unit 3 includes a switch module 31 and a power conversion module 32; the switch module 31 is mainly composed of a relay, and is connected in series with the live wire of the interface unit 5, and is used to realize on-off control of power consumption, overload protection operation, power limit control, etc.; The switch module 31 selects the HFE20-1-5-1HST-L1 relay with a breaking capacity of 16A. The relay has the characteristics of small size and low power consumption, which is beneficial to reduce the volume and power consumption of the present invention. The power conversion module 32 is used to convert the input mains voltage into a DC voltage suitable for the DSP-based home intelligent power consumption control terminal, and is the power supply system of the entire terminal.

As shown in Figure 3. The power conversion module is connected in parallel to the live wire L and the neutral wire N of the interface unit 5, and the power conversion module 32 includes a resettable fuse R11, a varistor R12, an AC-DC (AC/DC) conversion module P1, and an LC filter circuit; The two wiring ports of the DC conversion module P1 are respectively connected to the live wire L and the neutral wire N of the interface unit 5, and the line connected between the AC-DC conversion module P1 and the neutral wire N is connected in series with a resettable fuse R11, live wire L and neutral wire N The varistor R12 is connected in parallel between them, and the varistor R12 is located between the resettable fuse R11 and the current-DC conversion module P1; the two outlets of the AC-DC conversion module P1 are connected in parallel with the LC filter circuit; the LC filter circuit includes the first A filter capacitor C7, a second filter capacitor C8, a third filter capacitor C9, and a filter inductor L2; the first filter capacitor C7, the second filter capacitor C8, and the third filter capacitor C9 are connected in parallel, and the negative end of the parallel connection is grounded, and the positive end of the parallel connection terminal output +5V voltage, filter inductance L2 is connected in series between the positive end of the first filter capacitor C7 and the second filter capacitor C8; the resettable fuse R11 is used for short-circuit protection; the varistor R12 is used for overvoltage protection; AC - The DC conversion module P1 is used to convert the AC mains voltage into a 5V DC power supply; the first filter capacitor C7, the second filter capacitor C8, the third filter capacitor C9, and the filter inductor L2 together form an LC filter circuit, which converts the DC voltage ripple filtering.

The measurement unit 4 includes a signal conditioning module 41 and an analog-to-digital conversion module 42; the signal conditioning module 41 is composed of a voltage signal conditioning circuit and a current signal conditioning circuit, and is used to convert large voltage and large current signals into small voltage signals. The analog-to-digital conversion module 42 is connected between the signal conditioning module 41 and the central processing unit 1, and is used to convert the analog signal output by the signal conditioning module 41 into a digital signal and transmit it to the central processing unit 1 for data analysis. The analog-to-digital conversion module 42 is mainly composed of an integrated analog-to-digital conversion chip MAX1321, which is a 14-bit 4-channel ADC with +5V power supply, ±5V bipolar input, and ±16.5 input protection, which greatly simplifies the analog-to-digital conversion circuit design.

In order to clarify the structure of the signal conditioning module, it will be described below with FIG. 4 . As shown in Figure 4, the voltage signal conditioning circuit includes: a first resistor divider resistor R1, a second divider resistor R2, a first differential amplifier U1, a first proportional resistor RG1, a first filter resistor Ro1, and a first filter capacitor Co1 , the first bypass filter capacitor C1 and the third bypass filter capacitor C3; the two ends of the first proportional resistor RG1 are respectively connected to the two pins of the first differential amplifier U1; the first voltage divider resistor R1 and the second voltage divider One end of the resistor R2 is connected to the live line L and the neutral line N respectively, and the other end is connected in parallel to the first differential amplifier U1 for converting a large voltage into a small voltage signal, and the first voltage dividing resistor R1 and the second voltage dividing resistor R2 divide the voltage The output of the output is connected to the differential amplifier U1 to realize the amplification of small signals; the first bypass filter capacitor C1 and the third bypass filter capacitor C3 are respectively connected in parallel to the negative and positive power supply terminals of the first differential amplifier U1; the first One end of the filter resistor Ro1 is connected to the first differential amplifier U1, the other end is connected in parallel to the first filter capacitor Co1, the parallel terminal is connected to the output Uo of the voltage signal conditioning circuit, and the output is directly connected to the analog-to-digital conversion module 42; the first filter resistor Ro1 and the first filter capacitor Co1 form a first-order RC low-pass filter, which is used to filter out high-order harmonics output by voltage signal conditioning; Uo represents the output of the voltage signal conditioning circuit, and the signal is directly connected to the analog-to-digital conversion module 42 .

The current signal conditioning circuit includes a current detection resistor R3, a second differential amplifier U2, a second proportional resistor RG2, a second filter resistor Ro2, a second filter capacitor Co2, a second bypass filter capacitor C2 and a fourth bypass filter capacitor C4. The current-sensing resistor R3 is connected in series on the neutral line N, and the two ends of the current-sensing resistor R3 are respectively connected to the two terminals of the second differential amplifier U2 through wiring, and the current signal is converted into a small voltage signal, and connected to the differential amplifier U2 to realize Signal amplification; the two ends of the second proportional resistor RG2 are respectively connected to the two pins of the second differential amplifier U2; the second bypass filter capacitor C2 and the fourth bypass filter capacitor C4 are respectively connected in parallel to the negative pin of the second differential amplifier U2 , Positive power supply terminal; the bypass capacitor is used to filter the power supply noise of the differential amplifier. One end of the second filter resistor Ro2 is connected to the second differential amplifier U2, the other end is connected in parallel to the second filter capacitor Co2, the parallel end is connected to the output of the voltage signal conditioning circuit, and the output is connected to the analog-to-digital conversion module 42; the second filter resistor Ro2 and the second filter capacitor Co2 form a first-order RC low-pass filter, which is used to filter out high-order harmonics output by conditioning the current signal.

The central processing unit 1 is used to respond to service requests and data processing of information, energy, measurement, optimization units, etc.; the information unit 2 is used to store local user account information and power consumption data, and communicate with the upper cloud server to realize the upload of local data As well as receiving information such as real-time electricity prices and electricity consumption policies issued by the power grid, it can also realize information interaction with the APP installed on the user's mobile terminal; the energy unit 3 is used to realize energy management for various household appliances, including: On-off control, overload protection operation, power limit control, etc.; the measurement unit 4 is used to monitor the voltage and current signals of the connected neutral wire, live wire, and ground wire in real time to realize basic power consumption data collection.

After the measurement unit 4 completes a cycle of data collection, the central processing unit 1 responds to the calculation service request of the measurement unit 4, and uses digital signal processing algorithms such as FIR low-pass digital filtering, effective value calculation, and all-phase FFT to analyze the collected data. calculation, so as to obtain the basic power consumption of the connected household appliances; in addition, when the measurement unit 4 detects that a short-circuit fault occurs in the household appliances, it can also immediately send a warning to the central processing unit 1, and the central processing unit 1 connects After the warning is received, the energy unit 3 is immediately controlled to perform a power-off operation. After the collection is completed, the data analysis and calculation are completed, the central processing unit 1 can control the information unit 2 to upload real-time power consumption information to the cloud server; at the same time, when the information unit 2 receives the information transmitted by the cloud server, it sends the Information service request, after the central processing unit 1 responds, it can receive the information sent by the cloud server 7, such as the analysis result of the household appliance type, the grid electricity price information and the analysis result of the user's electricity consumption behavior pattern under the preferential policy, etc.; when the household appliance type is locked , the central processing unit 1 starts an automatic home appliance control mode, and realizes energy management of home appliances by controlling the energy unit 3 .

After power-on, the measuring unit 4 monitors and analyzes information such as voltage and current signal waveforms, spectrums, and powers in real time on connected household electrical appliances, and then uploads the information to the database of the cloud server through the information unit for comparison. , automatically identify the type of the connected home appliance; the cloud server 7 feeds back the identification result to the information unit and stores it. When the type of household appliances is locked, the central processing unit starts to execute the task of automatic household appliance control: use the measurement unit to monitor the power consumption, power consumption time and other information of the connected household appliances, and analyze the user's power consumption according to the corresponding analysis algorithm Behavior mode: According to the user's electricity consumption behavior habits, combined with the electricity price and preferential policies issued by the power grid received by the information unit, without affecting the user's comfort in electricity consumption, formulate the electricity consumption strategy for each connected home appliance and use it The energy unit automatically controls the starting time and working time of each household appliance.

The DSP-based home intelligent power consumption control terminal of the present invention first monitors the connected household appliances such as air conditioners, refrigerators, water heaters, washing machines, etc. in real time, and collects voltage, current effective value, power, power factor, harmonics, Instantaneous current waveform and other basic power consumption information, and then upload these data to the cloud server for unified analysis and calculation, and finally return the calculation results to the intelligent power consumption control terminal, the central processing unit according to the calculation results of the cloud service and the power grid The released electricity price information and preferential policies, combined with the home appliance power consumption strategy formulated by professional optimization algorithms, automatically control the start-up time and working hours of each home appliance without affecting the user's comfort with electricity, so as to achieve efficient and intelligent power consumption and reduce Household energy consumption and other effects.

Claims (7)

1. A DSP-based home intelligent power consumption control terminal, characterized in that: comprise a central processing unit, an information unit, an energy unit, a measurement unit and an interface unit; the central processing unit is connected with the information unit, the energy unit and the measurement unit respectively; The interface unit is respectively connected with the energy unit and the measurement unit; The central processing unit is a controller with DSP as the core; The interface unit includes a plug and a socket; the plug and the socket are connected through a live wire, a ground wire and a neutral wire; the plug is also connected to the wiring board; the socket is also connected to the home appliance; The information unit includes a wifi communication module and a Flash storage module; the Wifi communication module is respectively connected to the cloud server and the user mobile terminal APP through a home router; the Flash storage module is connected to the central processing unit; The energy unit includes a switch module and a power conversion module; the switch module is mainly composed of a relay, and is connected in series with the live wire of the interface unit; the power conversion module is connected in parallel with the live wire and neutral wire of the interface unit, and the power conversion module includes a resettable fuse, Varistor, AC-DC conversion module and LC filter circuit; the two wiring ports of the AC-DC conversion module are respectively connected to the live wire and the neutral wire of the interface unit, and the connection between the AC-DC conversion module and the neutral wire is connected in series Restore the fuse, and connect the varistor between the live wire and the neutral wire in parallel, and the varistor is located between the self-recovery fuse and the current-to-DC conversion module; the two outlets of the AC-DC conversion module are connected to the LC filter circuit in parallel; the LC filter circuit Including the first filter capacitor, the second filter capacitor, the third filter capacitor and the filter inductor; the first filter capacitor, the second filter capacitor, and the third filter capacitor are connected in parallel, the parallel negative terminal is grounded, and the parallel positive terminal outputs +5V voltage , a filter inductor is connected in series between the positive terminals of the first filter capacitor and the second filter capacitor; The measuring unit includes a signal conditioning module and an analog-to-digital conversion module; the signal conditioning module is composed of a voltage signal conditioning circuit and a current signal conditioning circuit; the analog-to-digital conversion module is connected between the signal conditioning module and the central processing unit; the voltage signal conditioning circuit includes The first resistor divider resistor, the second divider resistor, the first differential amplifier, the first proportional resistor, the first filter resistor, the first filter capacitor, the first bypass filter capacitor and the third bypass filter capacitor; the first ratio The two ends of the resistor are respectively connected to the two pins of the first differential amplifier; one end of the first voltage dividing resistor and the second voltage dividing resistor are respectively connected to the live line and the neutral line, and the other end is connected to the first differential amplifier in parallel, and the first dividing The outputs of the piezoresistor and the second voltage dividing resistor are connected to the differential amplifier; the first bypass filter capacitor and the third bypass filter capacitor are respectively connected in parallel to the negative and positive power supply terminals of the first differential amplifier; the first filter resistor One end is connected to the first differential amplifier, the other end is connected in parallel to the first filter capacitor, the parallel terminal is connected to the output of the voltage signal conditioning circuit, and the output is directly connected to the analog-to-digital conversion module; The current signal conditioning circuit includes a current detection resistor, a second differential amplifier, a second proportional resistor, a second filter resistor, a second filter capacitor, a second bypass filter capacitor and a fourth bypass filter capacitor; the current detection resistor is connected in series On the zero line, the two ends of the current-sensing resistor are respectively connected to the two terminals of the second differential amplifier through wiring, and the two ends of the second proportional resistor are respectively connected to the two pins of the second differential amplifier; the second bypass filter capacitor and the fourth bypass filter capacitor are respectively connected in parallel to the negative and positive power supply terminals of the second differential amplifier; one end of the second filter resistor is connected to the second differential amplifier, the other end is connected in parallel to the second filter capacitor, and the parallel terminal is connected to the pressure signal conditioning The output of the circuit is connected, and the output is connected with the analog-to-digital conversion module. 2. The DSP-based home intelligent power consumption control terminal according to claim 1, characterized in that: the central processing unit is a controller with DSP as the core, and the C2000 system digital signal processor TMS320F28035 chip or TMS320F28027 chip is selected. 3. The DSP-based home intelligent power consumption control terminal according to claim 1, wherein the Wifi communication module is an integrated communication module based on an industrial-grade wireless communication chip CC3200. 4. The DSP-based home intelligent power consumption control terminal according to claim 1, characterized in that: the Flash storage module is mainly composed of an AT25FS040 chip, and the Flash storage module is connected to the central processing unit by using a 3-wire serial port communication mode to connect , with 4M storage space. 5. The DSP-based home intelligent power consumption control terminal according to claim 1, characterized in that: the switch module selects the HFE20-1-5-1HST-L1 relay with a breaking capacity of 16A. 6. The DSP-based home intelligent power consumption control terminal according to claim 1, wherein the analog-to-digital conversion module is mainly composed of an integrated analog-to-digital conversion chip MAX1321. 7. The DSP-based home intelligent power consumption control terminal according to claim 1, characterized in that: the first differential amplifier and the second differential amplifier are INA128 high-precision instrumentation amplifiers.