Two-wire system industrial microwave liquid level radar energy management system

Abstract

The invention provides a two-wire system industrial microwave liquid level radar energy management system, and relates to the field of industrial measurement and instruments. An external power source is received, power is supplied through a signal module, a control module processes signals and judges whether charging is needed or not, a switch element module manages the charging state of an energy storage module according to control signals, the energy storage module stores electric energy, a DC-DC module provides stable voltage for a microwave module, the microwave module measures the liquid level, and data is fed back to the control module. The control module adjusts an energy management strategy, ensures continuous and effective operation of the system, integrates functions of all the modules, and ensures high efficiency of the liquid level radar system in energy management and signal processing. According to the technical scheme, the energy of the two-wire system communication signal is stored in the energy storage module in advance, and then the energy is released from the energy storage module when the microwave module works, so that the technical problem that the instantaneous power consumption during working of the microwave module is too large is solved, normal working of the two-wire system industrial microwave liquid level radar is guaranteed, and the service life of the two-wire system industrial microwave liquid level radar is prolonged. And the stability, reliability and energy utilization rate of the system are improved.

Description

Technical Field

[0001] The invention relates to the field of industrial measurement and instrumentation, and in particular to a two-wire industrial microwave liquid level radar energy management system. Background Art

[0002] At present, 4-20mA current signal is a standard communication signal commonly used in industry. Compared with other digital bus communications, it does not need to process complex communication timing and the communication method is simpler. At the same time, the current loop has strong anti-interference ability and has higher reliability in some industrial sites with severe interference or requiring long-distance communication. Therefore, two-wire instruments using 4-20mA current signal communication are widely used in industry. Microwave radar is based on FMCW (continuous frequency modulation wave) technology. It realizes target detection by emitting electromagnetic waves to illuminate the target object and receiving its reflected echo. Compared with traditional liquid level measurement methods, microwave liquid level radar has the advantages of fast speed, non-contact, and strong anti-interference ability. It is the current mainstream liquid level measurement device.

[0003] In the existing technology, the voltage of the two-wire 4-20mA communication signal is generally DC 24V, and the power that 4mA can provide is less than 0.1W. Industrial instruments that use two-wire communication and power supply require ultra-low power operation; and the microwave module of the microwave level radar consumes a lot of power when working. For example, the power of the BGT24LTR22 microwave sensor produced by Infineon is as high as 0.2W in low power mode, which obviously cannot meet the operation requirements of the system. Therefore, how to ensure the normal operation of the radar through reasonable energy management is a major difficulty in the development of two-wire industrial microwave level radar. Summary of the invention

[0004] The main purpose of the present invention is to provide a two-wire industrial microwave liquid level radar energy management system to solve the problem of how to ensure the normal operation of the radar in a low power consumption mode through reasonable energy management.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a two-wire industrial microwave liquid level radar energy management system, comprising: The signal module connects the external device and the radar system through the communication port, is used to access the communication signal to communicate interactively with the external device, and also provides power for the system; A control module is connected to the switch element module and the signal module, and is connected to the power supply signal for signal communication; The switch element module is connected to the isolation transformer module and is used to receive the control signal of the control module to control the on / off of the charging of the energy storage module; An energy storage module, connected to the isolation transformer module, for storing the electric energy output by the isolation transformer module; The DC-DC module, whose output end is connected to the microwave module, is used to receive the power signal and perform voltage stabilization after voltage reduction conversion, and then output the voltage to the control module and the switch device module, while providing energy for the microwave module to work; The ADC module is connected to the energy storage module and is used to detect the energy storage voltage of the energy storage module and feed the voltage signal back to the control module; A microwave module, used to measure radar signals and transmit the measurement data to a control module; After the microwave module completes the measurement, it transmits the measurement data to the control module for processing. The control module drives the switch element module to work and continues to charge the energy storage module to provide energy for the next operation of the microwave module, thereby completing energy utilization and control.

[0006] In the preferred embodiment, a digital isolation module is further included, which is arranged between the control module and the ADC module and is used to isolate the feedback signal from the original signal.

[0007] In the preferred solution, when the microwave module is not working, the control module outputs a PWM signal to control the switch element module, the output of the switch element module is connected to the isolation transformer module, and the electric energy is transmitted to the energy storage module for storage through the isolation transformer module. At the same time, the ADC module detects the energy storage voltage of the energy storage module in real time and feeds the signal back to the control module. The control module and the ADC module are connected using a digital isolation module; When the microwave module is working, the energy storage module outputs electric energy through the subsequent DC-DC module to provide energy for the microwave module to work; after the microwave module completes the measurement, it transmits the measurement data to the control module through the digital isolation module for processing. After the control module receives the measurement data, it continues to drive the switching element module to work through the PWM signal to charge the energy storage module and prepare for the next operation of the microwave module.

[0008] The preferred solution includes: in a specific circuit, the power supply is 24V input, and the DC-DC module includes DC-DC power supply chips V1 and V2; The control signal includes PWMA and PWMB output by the control module, and the switch element module includes switch tubes Q1 and Q2; The isolation transformer module includes an isolation transformer T1, diodes D1 and D2 for rectification, and inductor L1 and capacitor C1 for filtering; The energy storage module includes an inductor C2 and a diode D3 as a protection device to assist in energy storage; The power output ports OUT+ and OUT- are connected to the microwave module, and AOUT is connected to the ADC module.

[0009] In the preferred solution, the connection relationship of the circuit is specifically as follows: The 24V input is connected to the V1 input terminal, and the V1 output terminal is connected to the common terminal of the primary winding of T1; PWMA and PWMB are connected to the G poles of the switch tubes Q1 and Q2 through resistors R1 and R2 respectively; the S poles of the switch tubes Q1 and Q2 are connected to the GND port, and the D poles are connected to the two input terminals of the primary winding of T1 respectively; The output end of the secondary winding of T1 is connected to the P poles of D1 and D2 respectively; after the N poles of D1 and D2 are connected, they are connected to one end of the inductor L1; One end of the capacitor C1, diode D3 and capacitor C2 after being connected in parallel is connected to the other end of the inductor L1 and the input end of V2, and connected to AOUT from this end; the other end after being connected in parallel is connected to the common end of the secondary winding of T1 and the common end of V2, and is output as OUT-, and OUT+ is led out from the output end of V2.

[0010] The preferred solution includes: the external device and the radar system are connected through the 4-20mA / 24V port, and after the communication signal is connected: When connected to the control module, it is used as a communication signal for signal communication; After being stepped down by the previous DC-DC link, it is used as a voltage signal to provide power for the control module and the energy management part.

[0011] In the preferred solution, resistors R1 and R2 are current limiting resistors, switch tubes Q1 and Q2 are N-channel MOS tubes, diodes D1 and D2 are rectifier diodes, inductor L1 is an energy storage inductor, capacitor C1 is a filter capacitor, diode D3 is a voltage regulator diode, and capacitor C2 is an energy storage capacitor.

[0012] In the preferred solution, the induced current generated on the secondary side of T1 flows through the rectifier diodes D1 and D2 and then flows through the inductor L1 to the subsequent circuit, forming a loop with the secondary side common terminal, wherein L1 is used to stabilize the output current; The output current starts to charge capacitor C2, and the voltage across capacitor C2 gradually increases. AOUT outputs the voltage signal as feedback. When the voltage across capacitor C2 reaches the preset voltage, switch tubes Q1 and Q2 are turned off at the same time, and charging stops. When the system is working, the electric energy stored in capacitor C2 is output from OUT+ and OUT- after being stabilized and converted by power chip V2.

[0013] In the preferred solution, the capacitor C1 is used to eliminate voltage ripples, and the diode D3 is used as a voltage-stabilizing diode to stabilize and limit the voltage stored in the capacitor C2, and forms a loop with the capacitor C2 to consume the electric energy stored in the capacitor C2.

[0014] The preferred solution also includes adjusting the duty cycle of the PWM control signal to achieve corresponding energy storage speed adjustment, thereby controlling the charging time of the capacitor C2.

[0015] The present invention provides a two-wire industrial microwave liquid level radar energy management system, which receives an external power supply, supplies power through a signal module, processes the signal with a control module, determines whether charging is required, and manages the charging state of the energy storage module according to the control signal. The energy storage module stores electric energy for subsequent use. The DC-DC module provides a stable voltage for the microwave module, and the microwave module measures the liquid level. The data is fed back to the control module, and the control module adjusts the energy management strategy to ensure the continuous and effective operation of the system. The functions of each module are integrated, the high efficiency of the liquid level radar system in energy management and signal processing is ensured, and the stability, reliability and energy utilization of the system are improved.

[0016] By storing the energy of the two-wire communication signal in the energy storage module in advance and releasing the energy from the energy storage module when the microwave module is working, the technical problem of excessive instantaneous power consumption of the microwave module is solved, ensuring the normal operation of the two-wire industrial microwave liquid level radar. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a schematic diagram of the structure of the energy management system of the present invention; Figure 2 This is a schematic diagram of a two-wire industrial microwave liquid level radar energy management circuit according to a preferred embodiment of the present invention; Figure 3 This is a current loop diagram of a capacitor charging state in a preferred embodiment of the present invention; Figure 4 It is a current loop diagram of the capacitor discharge state in a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0018] Example 1 like Figure 1-4 As shown, a two-wire industrial microwave liquid level radar energy management system includes: The signal module connects the external device and the radar system through the communication port. It is used to access the communication signal to interact with the external device and provide power to the system.

[0019] The control module is connected with the switch element module and the signal module, and is connected with the power supply signal for signal communication.

[0020] The switch element module is connected to the isolation transformer module and is used to receive the control signal from the control module to control the on / off of charging of the energy storage module.

[0021] The energy storage module is connected to the isolation transformer module and is used to store the electric energy output by the isolation transformer module.

[0022] The DC-DC module, whose output end is connected to the microwave module, is used to receive the power signal and perform voltage stabilization after voltage reduction conversion, and then output the voltage to the control module and the switch device module, while providing energy for the microwave module to work.

[0023] The ADC module is connected to the energy storage module and is used to detect the energy storage voltage of the energy storage module and feed the voltage signal back to the control module.

[0024] The microwave module is used to measure the radar signal and transmit the measurement data to the control module.

[0025] After the microwave module completes the measurement, it transmits the measurement data to the control module for processing. The control module drives the switch element module to work and continues to charge the energy storage module to provide energy for the next operation of the microwave module, thereby completing energy utilization and control.

[0026] like Figure 1 As shown, the system receives external power supply and supplies power through the signal module. The control module processes the signal and determines whether charging is needed. The switch element module manages the charging status of the energy storage module according to the control signal. The energy storage module stores electrical energy for subsequent use. The DC-DC module provides a stable voltage for the microwave module. The microwave module measures the liquid level and feeds the data back to the control module. The control module adjusts the energy management strategy to ensure the continuous and effective operation of the system. It integrates the functions of each module and performs precise energy management to ensure that the microwave liquid level radar can work stably, thereby improving the stability, reliability and energy utilization of the system.

[0027] In this embodiment, the 4-20mA / 24V signal can be used as a communication signal and can also be used to power the radar. Therefore, it is divided into two paths after connection. The present invention mainly discusses the power supply problem.

[0028] In the preferred embodiment, a digital isolation module is further included, which is arranged between the control module and the ADC module and is used to isolate the feedback signal from the original signal.

[0029] Digital isolation modules are used to avoid the influence of high voltage, high current or noise interference on signal transmission, ensure the quality and accuracy of signals, enhance the stability and reliability of the system, and improve the measurement accuracy and overall system performance.

[0030] In the preferred embodiment, when the microwave module is not working, the control module outputs a PWM signal to control the switch element module, the output of the switch element module is connected to the isolation transformer module, and the electric energy is transmitted to the energy storage module for storage through the isolation transformer module. At the same time, the ADC module detects the energy storage voltage of the energy storage module in real time and feeds the signal back to the control module. The control module and the ADC module are connected using a digital isolation module.

[0031] When the microwave module is working, the energy storage module outputs electric energy through the subsequent DC-DC module to provide energy for the microwave module to work; after the microwave module completes the measurement, it transmits the measurement data to the control module through the digital isolation module for processing. After the control module receives the measurement data, it continues to drive the switching element module to work through the PWM signal to charge the energy storage module and prepare for the next operation of the microwave module.

[0032] The measurement data is obtained by measuring the microwave module based on the received signal.

[0033] In this embodiment, the microwave module works as follows: 1. When the microwave module is not working, The control module outputs a PWM signal to control the switch element module.

[0034] The switch element module is turned on or off according to the PWM signal, and transmits the electrical energy to the energy storage module through the isolation transformer module for storage.

[0035] The ADC module monitors the energy storage voltage of the energy storage module in real time, and transmits the feedback signal to the control module through the digital isolation module to ensure that the control module obtains accurate voltage information.

[0036] 2. When the microwave module is working, The energy storage module outputs electrical energy through the subsequent DC-DC module to provide a stable operating voltage for the microwave module.

[0037] The microwave module performs the measurement, and after the measurement is completed, the measurement data is transmitted to the control module through the digital isolation module for processing.

[0038] The control module receives and processes the measurement data and evaluates the system status.

[0039] 3. Subsequent charging process: After processing the measurement data, the control module continues to drive the switch element module through the PWM signal to control its working state; the switch element module is turned on again and starts to charge the energy storage module to prepare for the next operation of the microwave module. The various modules work together to achieve efficient energy management and radar measurement functions.

[0040] In this embodiment, Figure 2 The specific circuit corresponds to Figure 1 The area selected by the dotted line.

[0041] In order to realize the functions of this system, an optimal specific circuit structure is given, such as Figure 2 shown.

[0042] In the preferred solution, in the specific circuit, the power supply is 24V input, and the DC-DC module includes DC-DC power supply chips V1 and V2; The control signal includes PWMA and PWMB output by the control module, and the switch element module includes switch tubes Q1 and Q2; The isolation transformer module includes an isolation transformer T1, diodes D1 and D2 for rectification, and inductor L1 and capacitor C1 for filtering; The energy storage module includes an inductor C2 and a diode D3 as a protection device to assist in energy storage; The power output ports OUT+ and OUT- are connected to the microwave module, and AOUT is connected to the ADC module.

[0043] In the preferred solution, the connection relationship of the circuit is specifically as follows: 1. Power supply connection: 24V input is connected to V1 input terminal, and V1 output terminal is connected to the common terminal of T1 primary winding; 2. PWM signal control: PWMA and PWMB are connected to the G poles of the switch tubes Q1 and Q2 through resistors R1 and R2 respectively; the S poles of the switch tubes Q1 and Q2 are connected to the GND port, and the D poles are connected to the two input terminals of the primary winding of T1 respectively; 3. Transformer connection: The output end of the secondary winding of T1 is connected to the P poles of D1 and D2 respectively; after the N poles of D1 and D2 are connected, they are connected to one end of the inductor L1; 4. Filtering and output circuit: One end of the capacitor C1, diode D3 and capacitor C2 after being connected in parallel is connected to the other end of the inductor L1 and the input end of V2, and connected to AOUT from this end; the other end after being connected in parallel is connected to the common end of the secondary winding of T1 and the common end of V2, and is output as OUT-, and OUT+ is led out from the output end of V2.

[0044] The overall circuit in this embodiment effectively controls the transmission of electric energy and provides a stable output voltage to meet the operation requirements of the system. The specific functions are: The power module (V1) converts the 24V input and provides it to the transformer T1.

[0045] PWM control regulates the transmission of electric energy through Q1 and Q2 to drive the transformer.

[0046] Diodes D1 and D2 perform rectification, ensuring that current flows in one direction, preventing reverse current from damaging the circuit.

[0047] Inductor L1 and capacitor C1 work together to form a filter circuit to smoothly output voltage.

[0048] Capacitor C2 stores electrical energy, and diode D3 provides protection.

[0049] The output terminals (OUT+ and OUT-) provide stable power to subsequent modules.

[0050] In the preferred solution, the external device and the radar system are connected through a 4-20mA / 24V port. After the communication signal is connected, it can be considered to be divided into two paths. One path is connected to the control system and used as a communication signal for signal communication. The other path is stepped down by the previous DC-DC link and then used as a voltage signal to provide power for the control system and energy management part.

[0051] In this embodiment, the external device communicates with the radar system through a 4-20mA signal to transmit control instructions or data, and the signal is split. One path is responsible for signal communication and is directly connected to the control system to ensure real-time data exchange and command transmission. The other path passes through the front-stage DC-DC conversion module to reduce the voltage to meet the power requirements of the control system and energy management module; the system's anti-interference ability is enhanced, and signals from external devices are received and processed in real time, improving the system's response speed and processing capabilities.

[0052] In the preferred embodiment, resistors R1 and R2 are current limiting resistors, switch tubes Q1 and Q2 are N-channel MOS tubes, diodes D1 and D2 are rectifier diodes, inductor L1 is an energy storage inductor, capacitor C1 is a filter capacitor, diode D3 is a voltage regulator diode, and capacitor C2 is an energy storage capacitor.

[0053] In the preferred solution, the capacitor C1 is used to eliminate voltage ripples, and the diode D3 is used as a voltage-stabilizing diode to stabilize and limit the voltage stored in the capacitor C2, and forms a loop with the capacitor C2 to consume the electric energy stored in the capacitor C2.

[0054] In this embodiment, the current limiting resistor, the voltage stabilizing diode and the energy storage capacitor jointly protect the circuit to prevent overcurrent and overvoltage, thereby improving system reliability.

[0055] In the preferred solution, the induced current generated on the secondary side of T1 flows through the rectifier diodes D1 and D2 and then flows through the inductor L1 to the subsequent circuit, forming a loop with the secondary side common terminal, wherein L1 is used to stabilize the output current; The output current starts to charge capacitor C2, and the voltage across capacitor C2 gradually increases. AOUT outputs the voltage signal as feedback. When the voltage across capacitor C2 reaches the preset voltage, Q1 and Q2 are turned off at the same time, and charging stops. When the system is working, the unstable electric energy is stored in the power supply, which is stabilized by the power chip V2. The electric energy stored in capacitor C2 is converted by V2 and output from OUT+ and OUT-.

[0056] In this embodiment, the inductor L1 can significantly reduce the fluctuation of the output current, ensuring that the subsequent circuit obtains a stable power supply.

[0057] By implementing a signal feedback mechanism through AOUT, the capacitor can be effectively prevented from overcharging, thus improving the safety and reliability of the system.

[0058] The charging and discharging process of capacitor C2 is combined with the step-down conversion of V2 to ensure efficient output of energy and optimize power management.

[0059] This embodiment effectively integrates the functions of various components to achieve stable current output and intelligent control, and is suitable for systems that require efficient energy management. Through precise voltage feedback and switch control, the reliability of the circuit is ensured. and security.

[0060] The preferred solution also includes adjusting the duty cycle of the PWM control signal to achieve corresponding energy storage speed adjustment, thereby controlling the charging time of the capacitor C2.

[0061] This embodiment can dynamically adjust the duty cycle of the PWM signal by real-time monitoring of the voltage of the capacitor C2 and combining it with the AOUT signal feedback to ensure that the capacitor is charged to the target voltage within a preset time; when the duty cycle is increased, the on-time of the switch tube is extended, the energy input of the inductor L1 is increased, and the charging speed of the capacitor C2 is accelerated; when the duty cycle is reduced, the on-time of the switch tube is shortened, the energy transmitted by the inductor L1 is reduced, and the charging speed of the capacitor C2 is slowed down.

[0062] The dynamic adjustment capability of this embodiment enables the system to respond quickly and maintain stable output when faced with load changes.

[0063] like Figure 3 As shown in the figure, it is the path when capacitor C2 is charged. At this time, PWMA and PWMB control the switch tubes Q1 and Q2 to be turned on alternately. The current flows out from the power chip V1 and flows through the primary winding of the transformer T1 to form a loop. Then, an induced current is generated in the secondary winding of the transformer T1. The induced current flows through the diodes D1 and D2 and flows through the inductor L1 to charge the capacitor C2. The current flows back to the common end of the transformer through the capacitor C2 to form a loop. As the charging progresses, the voltage across the capacitor C2 gradually rises and is fed back through AOUT. When the set voltage is reached, the switch tubes Q1 and Q2 are turned off to stop charging.

[0064] like Figure 4 As shown in the figure, it is the path of capacitor C2 when it is discharged. At this time, the current flows out from the positive electrode of capacitor C2, and is output after being stabilized by the power chip V2. The current flows out from OUT+ and flows back to the negative electrode of capacitor C2 through OUT- to form a loop. As the discharge progresses, the voltage across capacitor C2 gradually decreases and is fed back through AOUT. When it is lower than the set voltage, the power chip V2 is turned off, and the discharge ends.

[0065] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A two-wire industrial microwave liquid level radar energy management system, characterized in that: include: The signal module connects the external device and the radar system through the communication port, is used to access the communication signal to communicate interactively with the external device, and also provides power for the system; A control module is connected to the switch element module and the signal module, and is connected to the power supply signal for signal communication; The switch element module is connected to the isolation transformer module and is used to receive the control signal of the control module to control the on / off of the charging of the energy storage module; An energy storage module, connected to the isolation transformer module, for storing the electric energy output by the isolation transformer module; The DC-DC module, whose output end is connected to the microwave module, is used to receive the power signal and perform voltage stabilization after voltage reduction conversion, and then output the voltage to the control module and the switch device module, while providing energy for the microwave module to work; The ADC module is connected to the energy storage module and is used to detect the energy storage voltage of the energy storage module and feed the voltage signal back to the control module; A microwave module, used to measure radar signals and transmit the measurement data to a control module; After the microwave module completes the measurement, it transmits the measurement data to the control module for processing. The control module drives the switch element module to work and continues to charge the energy storage module to provide energy for the next operation of the microwave module, thereby completing energy utilization and control.

2. The two-wire industrial microwave liquid level radar energy management system according to claim 1 is characterized in that: It also includes a digital isolation module, which is arranged between the control module and the ADC module and is used to isolate the feedback signal from the original signal.

3. The two-wire industrial microwave liquid level radar energy management system according to claim 2 is characterized in that: When the microwave module is not working, the control module outputs a PWM signal to control the switch element module. The output of the switch element module is connected to the isolation transformer module. The electric energy is transmitted to the energy storage module for storage through the isolation transformer module. At the same time, the ADC module detects the energy storage voltage of the energy storage module in real time and feeds the signal back to the control module. The control module and the ADC module are connected using a digital isolation module. When the microwave module is working, the energy storage module outputs electric energy through the subsequent DC-DC module to provide energy for the microwave module to work; after the microwave module completes the measurement, it transmits the measurement data to the control module through the digital isolation module for processing. After the control module receives the measurement data, it continues to drive the switching element module to work through the PWM signal to charge the energy storage module and prepare for the next operation of the microwave module.

4. The two-wire industrial microwave liquid level radar energy management system according to claim 1 is characterized in that: include: In the specific circuit, the power supply is 24V input, and the DC-DC module includes DC-DC power supply chips V1 and V2; The control signal includes PWMA and PWMB output by the control module, and the switch element module includes switch tubes Q1 and Q2; The isolation transformer module includes an isolation transformer T1, diodes D1 and D2 for rectification, and inductor L1 and capacitor C1 for filtering; The energy storage module includes an inductor C2 and a diode D3 as a protection device to assist in energy storage; The power output ports OUT+ and OUT- are connected to the microwave module, and AOUT is connected to the ADC module.

5. The two-wire industrial microwave liquid level radar energy management system according to claim 4 is characterized in that: include: The connection relationship of the circuit is specifically as follows: The 24V input is connected to the V1 input terminal, and the V1 output terminal is connected to the common terminal of the primary winding of T1; PWMA and PWMB are connected to the G poles of the switch tubes Q1 and Q2 through resistors R1 and R2 respectively; the S poles of the switch tubes Q1 and Q2 are connected to the GND port, and the D poles are connected to the two input terminals of the primary winding of T1 respectively; The output end of the secondary winding of T1 is connected to the P poles of D1 and D2 respectively; after the N poles of D1 and D2 are connected, they are connected to one end of the inductor L1; One end of the capacitor C1, diode D3 and capacitor C2 after being connected in parallel is connected to the other end of the inductor L1 and the input end of V2, and connected to AOUT from this end; the other end after being connected in parallel is connected to the common end of the secondary winding of T1 and the common end of V2, and is output as OUT-, and OUT+ is led out from the output end of V2.

6. The two-wire industrial microwave liquid level radar energy management system according to claim 5 is characterized in that: include: The external device and radar system are connected via the 4-20mA / 24V port. After the communication signal is connected: When connected to the control module, it is used as a communication signal for signal communication; After being stepped down by the previous DC-DC link, it is used as a voltage signal to provide power for the control module and the energy management part.

7. The two-wire industrial microwave liquid level radar energy management system according to claim 6 is characterized in that: include: Resistors R1 and R2 are current limiting resistors, switch tubes Q1 and Q2 are N-channel MOS tubes, diodes D1 and D2 are rectifier diodes, inductor L1 is an energy storage inductor, capacitor C1 is a filter capacitor, diode D3 is a voltage regulator diode, and capacitor C2 is an energy storage capacitor.

8. The two-wire industrial microwave liquid level radar energy management system according to claim 7 is characterized in that: The induced current generated on the secondary side of T1 flows through the rectifier diodes D1 and D2 and then flows through the inductor L1 to the subsequent circuit, forming a loop with the secondary side common terminal, where L1 is used to stabilize the output current; The output current starts to charge capacitor C2, and the voltage across capacitor C2 gradually increases. AOUT outputs the voltage signal as feedback. When the voltage across capacitor C2 reaches the preset voltage, switch tubes Q1 and Q2 are turned off at the same time, and charging stops. When the system is working, the electric energy stored in capacitor C2 is output from OUT+ and OUT- after being stabilized and converted by power chip V2.

9. The two-wire industrial microwave liquid level radar energy management system according to claim 8 is characterized in that: The capacitor C1 is used to eliminate voltage ripples, and the diode D3 is used as a voltage-stabilizing diode to stabilize and limit the voltage stored in the capacitor C2, and forms a loop with the capacitor C2 to consume the electric energy stored in the capacitor C2.

10. The two-wire industrial microwave liquid level radar energy management system according to claim 9, characterized in that: It also includes adjusting the duty cycle of the PWM control signal to achieve corresponding energy storage speed adjustment, thereby controlling the charging time of the capacitor C2.

Images