WO2020124947A1 - Radar level gauge system, and power supply method for same - Google Patents

Radar level gauge system, and power supply method for same Download PDF

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Publication number
WO2020124947A1
WO2020124947A1 PCT/CN2019/087277 CN2019087277W WO2020124947A1 WO 2020124947 A1 WO2020124947 A1 WO 2020124947A1 CN 2019087277 W CN2019087277 W CN 2019087277W WO 2020124947 A1 WO2020124947 A1 WO 2020124947A1
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Prior art keywords
radar
signal processing
processing module
power supply
control
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PCT/CN2019/087277
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French (fr)
Chinese (zh)
Inventor
周雷
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北京古大仪表有限公司
周雷
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Application filed by 北京古大仪表有限公司, 周雷 filed Critical 北京古大仪表有限公司
Publication of WO2020124947A1 publication Critical patent/WO2020124947A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/284—Electromagnetic waves
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply

Definitions

  • This article relates to the field of measurement, especially to a radar level measurement system and its power supply method.
  • Radar level gauge is a commonly used measuring instrument in the field of level measurement. It has the advantages of accurate measurement, stable performance, high reliability, easy maintenance, and wide application range.
  • the radar level gauge can be installed in various metal, non-metallic containers or pipelines to perform non-contact continuous measurement of the liquid, slurry and granular material levels. With the development of radar level gauges towards intelligence and miniaturization, current radar level gauges usually use single-chip radar sensors for measurement.
  • the two-wire interface is a common interface for industrial instruments.
  • the construction and cable costs are greatly saved, which brings great convenience to on-site construction and post-maintenance.
  • the device using a two-wire interface power supply puts forward higher requirements for the low power consumption of the device.
  • This paper provides a radar level measurement system and its power supply method, which can meet the power consumption requirements of a two-wire radar level measurement system.
  • An embodiment of the present invention provides a radar level measurement system, including: a power supply module and a load circuit; the load circuit includes: a switch module, a radar radio frequency signal processing module, a control and signal processing module;
  • the power supply module is configured to convert the electric energy of the DC power supply to a set voltage through energy storage and voltage reduction and supply power to the load circuit;
  • the radar radio frequency signal processing module is set to transmit and receive radar radio frequency signals, convert the received radar radio frequency signals into radar digital signals and output to the control and signal processing module;
  • the switch module is set to turn on the power supply end of the radar RF signal processing module when it is turned on, and disconnect the power supply end of the radar RF signal processing module when it is turned off;
  • the control and signal processing module is configured to control the on and off of the switch module to intermittently power on the radar RF signal processing module; after receiving the radar digital signal, perform data processing on the radar digital signal to obtain a measurement result,
  • the power supply module is controlled to change the output current of the DC power supply, and the magnitude of the output current represents the value of the measurement result.
  • control and signal processing module is configured to control the switch module to be turned off in the following manner: after receiving the radar digital signal sent by the radar radio frequency signal processing module, the control switch module is turned off to make the radar radio frequency signal The processing module is powered off.
  • control and signal processing module is configured to control the switch module to be turned on in the following manner: timing the switch module to be turned on to periodically power on the radar radio frequency signal processing module.
  • control and signal processing module includes: a main control chip and a digital signal processing DSP chip;
  • the main control chip is configured to receive the measurement result sent by the DSP chip, and control the power supply module to change the output current of the DC power supply, and the magnitude of the output current represents the value of the measurement result;
  • the DSP chip is set to control the switch module to be turned on to power on the radar RF signal processing module; after receiving the radar digital signal sent by the radar RF signal processing module, the switch module is turned off to enable the radar RF signal processing The module is powered off; data processing is performed on the radar digital signal to obtain a measurement result, and the measurement result is sent to the main control chip.
  • the DSP chip is further configured to enter a sleep mode or a low power consumption mode after sending the measurement result to the main control chip.
  • the DSP chip is further configured to exit the sleep mode or low power consumption mode after receiving the wake-up signal of the main control chip; after exiting the sleep mode or low power consumption mode, control the switch module to turn on The radar RF signal processing module is powered on;
  • the main control chip is also set to periodically send a wake-up signal to the DSP chip.
  • the power supply module includes: a current control unit, an energy storage unit, a current discharge unit, and a voltage reduction unit; the energy storage unit includes an energy storage element;
  • the input end of the current control unit is connected to the DC power supply, and the output end is connected to the energy storage unit, which is set to change the output current of the DC power supply under the control of the control and signal processing module;
  • the input end of the energy storage unit is connected to the current control unit, and the output end is connected to the step-down unit, which is set to store the electric energy of the DC power supply through the energy storage element;
  • the current bleeder unit is connected to the energy storage unit and is set to discharge the current when the voltage across the energy storage element exceeds the threshold;
  • the input end of the step-down unit is connected to the energy storage unit, and the output end is connected to the load circuit, which is set to reduce the voltage output by the energy storage unit to a multi-channel power supply voltage and output to the load circuit.
  • the current control unit includes: a first operational amplifier U1, a second operational amplifier U2, resistors R1, R2, R3, R4, R5, switch tubes Q1 and Q2;
  • the radar level measurement system further includes: a digital-to-analog converter DAC100; the DAC100 is connected to the control and signal processing module or built into the control and signal processing module, and is configured to convert the measurement result into a control current signal Voltage signal
  • the inverting input end of the first operational amplifier U1 is connected to the first end of the resistor R2 and the first end of the switching tube Q1 respectively, the second end of the resistor R2 is connected to the positive pole of the DC power supply, and the negative pole of the DC power supply is grounded ;
  • the non-inverting input end of the first operational amplifier U1 is connected to the first end of the resistor R3, the second end of the resistor R3 is respectively connected to the second end of the resistor R1 and the first end of the switch Q2; the first end of the resistor R1 is connected The positive pole of the DC power supply; the output end of the first operational amplifier U1 is connected to the second end of the switch tube Q1;
  • the non-inverting input end of the second operational amplifier U2 is connected to the output end of the DAC 100; the inverting input end of the second operational amplifier U2 is connected to the first end of the resistor R4, and the second end of the resistor R4 is connected to the first end of the switch Q1 respectively Three terminals and the first terminal of the resistor R5; the second terminal of the resistor R5 is grounded; the output terminal of the second operational amplifier U2 is connected to the second terminal of the switch tube Q2; the third terminal of the switch tube Q2 is used as the current The output of the control unit 101.
  • the current bleeder unit includes: an operational amplifier U3, a transistor J1, resistors R6, R7, R8, R9, and a voltage regulator Z1;
  • the inverting terminal of the operational amplifier U3 is connected to the first terminal of the resistor R6 and the first terminal of the resistor R7, the second terminal of the resistor R6 is connected to the first terminal of the capacitor C1, and the second terminal of the capacitor C1 is grounded.
  • the second end of the resistor R7 is grounded;
  • the capacitor C1 is an energy storage element;
  • the non-inverting terminal of the operational amplifier U3 is connected to the reference voltage V ref ;
  • the output terminal of the operational amplifier U3 is connected to the base of the transistor J1, the collector of the transistor J1 is connected to the first terminal of the resistor R9, and the second terminal of the resistor R9 is connected to the first terminal of the capacitor C1; the transistor J1 Of the emitter is grounded.
  • the radar radio frequency signal processing module is a radar sensor chip.
  • An embodiment of the present invention provides a power supply method for a radar level measurement system, including:
  • the control and signal processing module controls the switch module to turn on to power on the radar RF signal processing module
  • the radar RF signal processing module After the radar RF signal processing module is powered on, it transmits and receives the radar RF signal, converts the received radar RF signal into a radar digital signal and outputs it to the control and signal processing module;
  • control switch module After the control and signal processing module receives the radar digital signal, the control switch module is turned off to power off the radar RF signal processing module, data processing is performed on the radar digital signal to obtain a measurement result, and the power supply module is controlled to change the output current of the DC power supply. The magnitude of the output current indicates the value of the measurement result.
  • control and signal processing module controls the switch module to turn on to power on the radar RF signal processing module, including:
  • the control and signal processing module regularly controls the switch module to be turned on to power on the radar RF signal processing module.
  • control and signal processing module includes: a main control chip and a digital signal processing DSP chip;
  • the control and signal processing module controls the switch module to turn on and power on the radar RF signal processing module, including: the DSP chip controls the switch module to turn on to power on the radar RF signal processing module;
  • the control switch module After the control and signal processing module receives the radar digital signal, the control switch module is turned off to power off the radar RF signal processing module, which includes: after the DSP chip receives the radar digital signal, the control switch module is disconnected to turn off the radar RF signal processing module Power off
  • the control and signal processing module processes the radar digital signal to obtain a measurement result, and controls the power supply module to change the output current of the DC power supply, including: a DSP chip performs data processing on the radar digital signal to obtain a measurement result, and then performs the measurement The result is sent to the main control chip; after receiving the measurement result, the main control chip controls the power supply module to change the output current of the DC power supply.
  • the method further includes:
  • the DSP chip After the DSP chip sends the measurement result to the main control chip, it enters sleep mode or low power consumption mode;
  • the DSP chip exits the sleep mode or low power consumption mode after receiving the wake-up signal of the main control chip;
  • the control and signal processing module controls the switch module to turn on to power on the radar RF signal processing module, including:
  • the switch module is controlled to be turned on to power on the radar radio frequency signal processing module.
  • the radar level measurement system and the power supply method provided by the embodiments of the present invention can reduce the power consumption of the radar RF signal processing module by intermittently supplying power to the radar RF signal processing module, thereby satisfying the two-wire radar object Power consumption requirements of a bit measurement system.
  • the control and signal processing module controls the radar RF signal processing module to periodically power on, and after receiving the radar digital signal output from the radar RF signal processing module, the control and signal processing module controls the radar RF signal processing for the first time
  • the module is powered off, which minimizes the power-on time of the radar RF signal processing module and further reduces the power consumption of the entire radar level measurement system.
  • the radar digital signal processing function is assumed by the control and signal processing module.
  • the DSP chip responsible for radar data processing can be put into sleep or low power consumption state when the radar digital signal is not processed, thereby further reducing the power consumption of the entire level measurement system.
  • FIG. 1 is a schematic diagram of a radar level measurement system in an embodiment of the present invention
  • FIG. 2-a is a schematic diagram of a control and signal processing module in an embodiment of the invention.
  • FIG. 2-b is a schematic diagram of another control and signal processing module in an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a power supply module in an embodiment of the present invention.
  • Figure 4-a is a schematic diagram of a current control unit in an embodiment of the present invention.
  • Fig. 4-b is a schematic diagram of a current discharge unit according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a radar level measurement system (with display operation module) according to an embodiment of the present invention
  • FIG. 6 is a flowchart of a power supply method of a radar level measurement system according to an embodiment of the present invention.
  • Example 7 is a schematic diagram of a radar level measurement system of Example 1 of the present invention.
  • Example 8 is a schematic diagram of a single-chip radar sensor in Example 1 of the present invention.
  • 1 power supply module 2 load circuit; 20 switch module; 30 radar RF signal processing module; 40 control and signal processing module; 50 display and operation module;
  • At least one embodiment of the present invention provides a radar level measurement system, including: a power supply module 1 and a load circuit 2; the load circuit 2 includes: a switch module 20, a radar RF signal processing module 30, Control and signal processing module 40;
  • the power supply module is configured to convert the electric energy of the DC power supply to a set voltage through energy storage and voltage reduction and supply power to the load circuit;
  • the radar radio frequency signal processing module is set to transmit and receive radar radio frequency signals, convert the received radar radio frequency signals into radar digital signals and output to the control and signal processing module;
  • the switch module is set to turn on the power supply end of the radar RF signal processing module when it is turned on, and disconnect the power supply end of the radar RF signal processing module when it is turned off;
  • the control and signal processing module is configured to control the on and off of the switch module to intermittently power on the radar RF signal processing module; after receiving the radar digital signal, perform data processing on the radar digital signal to obtain a measurement result,
  • the power supply module is controlled to change the output current of the DC power supply, and the magnitude of the output current represents the value of the measurement result.
  • intermittent power-up of the radar RF signal processing module can reduce the power consumption of the radar RF signal processing module, so that the entire radar level measurement system can still meet the power consumption requirement under the condition of minimum transmission current power supply.
  • control and signal processing module is configured to control the switch module to be turned off in the following manner: after receiving the radar digital signal sent by the radar RF signal processing module, the control switch module is turned off to make the radar RF signal The processing module is powered off.
  • the control and signal processing module controls the radar RF signal processing module to be powered off for the first time, thus minimizing the power on of the radar RF signal processing module Time further reduces the power consumption of the entire radar level measurement system.
  • control and signal processing module is configured to control the switch module to be turned on in the following manner: timing the switch module to be turned on to periodically power on the radar RF signal processing module.
  • periodically powering on the radar RF signal processing module compared to always powering on the radar RF signal processing module can further save power consumption of the radar level measurement system.
  • the data processing performed by the control and signal processing module on the radar digital signal includes: FFT (Fast Fourier Transformation) operation;
  • the radar RF signal processing module is implemented using a radar sensor chip.
  • a radar radio frequency signal processing subsystem and a radar digital signal processing subsystem are generally integrated on the radar sensor chip. Therefore, the power consumption of the radar sensor chip is large.
  • the radar RF signal processing subsystem on the radar sensor chip works first to generate radar digital signals, and then the radar digital signal processing subsystem on the radar sensor chip starts working again to perform radar digital signal processing (for example, FFT operation, logarithm operation ), because the digital signal computing time is longer, so the entire chip is in a long-term power consumption state.
  • a radar RF signal processing subsystem and a radar digital signal processing subsystem are integrated on the radar sensor chip, only the radar RF signal processing subsystem on the radar sensor chip is used, and The radar hardware accelerator inside the chip is not used.
  • the radar RF signal processing subsystem receives the radar RF signal from the antenna and processes it as a radar digital signal, it outputs the radar digital signal out of the radar sensor chip, and then the control and signal processing module controls the switch module to turn off Turning off the radar sensor chip, so that the radar sensor chip is in a short-term working state, saving power consumption of the entire level measurement system.
  • control and signal processing module 40 includes: a main control chip 401 and a digital signal processing DSP chip 402;
  • the main control chip is configured to receive the measurement result sent by the DSP chip, and control the power supply module to change the output current of the DC power supply, and the magnitude of the output current represents the value of the measurement result;
  • the DSP chip is set to control the switch module to be turned on to power on the radar RF signal processing module; after receiving the radar digital signal sent by the radar RF signal processing module, the switch module is turned off to enable the radar RF signal processing The module is powered off; data processing is performed on the radar digital signal to obtain a measurement result, and the measurement result is sent to the main control chip.
  • control and signal processing module 40 includes: a main control chip 401 and a digital signal processing DSP chip 402;
  • the main control chip is configured to control the switch module to turn on to power on the radar RF signal processing module and send a first notification message to the DSP chip; after receiving the second notification message, control the switch module to turn off to make the radar
  • the RF signal processing module is powered off, and after receiving the measurement result, the power supply module is controlled to change the output current of the DC power supply, and the magnitude of the output current represents the value of the measurement result;
  • the DSP chip is configured to prepare for signal reception after receiving the first notification message, and after receiving the radar digital signal sent by the radar RF signal processing module, send a second notification message to the main control chip to the radar
  • the digital signal performs data processing to obtain a measurement result, and sends the measurement result to the main control chip;
  • control function and the digital signal processing function are respectively responsible for two separate chips.
  • the DSP chip is good at arithmetic processing, and the control chip can pay no attention to the calculation performance.
  • the separate setting of control and calculation can optimize the system design. Conducive to chip selection.
  • the DSP chip is further configured to enter a sleep mode or a low power consumption mode after sending the measurement result to the main control chip.
  • the DSP chip enters the sleep or low power consumption mode after processing the radar data, which can further save the power consumption of the radar level measurement system.
  • the DSP chip is further configured to exit the sleep mode or low power consumption mode after receiving the wake-up signal of the main control chip; after exiting the sleep mode or low power consumption mode, control the switch module to turn on The radar RF signal processing module is powered on;
  • the main control chip is also set to periodically send a wake-up signal to the DSP chip;
  • a timer is generally integrated on the main control chip, so the main control chip can periodically wake up the DSP chip.
  • the power supply module includes: a current control unit 101, an energy storage unit 102, a current discharge unit 103, and a voltage reduction unit 104; the energy storage unit includes an energy storage element;
  • the input end of the current control unit is connected to the DC power supply, and the output end is connected to the energy storage unit, which is set to change the output current of the DC power supply under the control of the control and signal processing module;
  • the input end of the energy storage unit is connected to the current control unit, and the output end is connected to the step-down unit, which is set to store the electric energy of the DC power supply through the energy storage element;
  • the current bleeder unit is connected to the energy storage unit and is set to discharge the current when the voltage across the energy storage element exceeds the threshold;
  • the input end of the step-down unit is connected to the energy storage unit, and the output end is connected to the load circuit, which is set to reduce the voltage output by the energy storage unit to a multi-channel power supply voltage and output to the load circuit.
  • the energy storage element includes: a capacitor
  • the current control unit 101 includes: a first operational amplifier U1, a second operational amplifier U2, resistors R1, R2, R3, R4, R5, a switching transistor Q1 and Q2;
  • the radar level measurement system further includes: a digital-to-analog converter DAC100; the DAC100 is connected to the control and signal processing module or built into the control and signal processing module, and is configured to convert the measurement result into a control current signal Voltage signal
  • the inverting input end of the first operational amplifier U1 is connected to the first end of the resistor R2 and the first end of the switching tube Q1 respectively, the second end of the resistor R2 is connected to the positive pole of the DC power supply, and the negative pole of the DC power supply is grounded
  • the non-inverting input of the first operational amplifier U1 is connected to the first end of the resistor R3, the second end of the resistor R3 is respectively connected to the second end of the resistor R1 and the first end of the switching tube Q2; the first end of the resistor R1 is connected The positive pole of the DC power supply; the output end of the first operational amplifier U1 is connected to the second end of the switch tube Q1;
  • the non-inverting input terminal of the second operational amplifier U2 is connected to the output terminal of the DAC100; the inverting input terminal of the second operational amplifier U2 is connected to the first terminal of the resistor R4, and the second terminal of the resistor R4 is connected to the first terminal of the switching tube Q1, respectively Three terminals and the first terminal of the resistor R5; the second terminal of the resistor R5 is grounded; the output terminal of the second operational amplifier U2 is connected to the second terminal of the switch tube Q2; the third terminal of the switch tube Q2 is used as the current The output of the control unit 101.
  • the second end (gate) of the switch Q1 is the control end.
  • V 0 of the DAC100 Changing the output voltage V 0 of the DAC100 will cause the second operational amplifier U2 to adjust the switching transistor Q2.
  • the current I flowing through the sampling resistor R1 can be adjusted by the output voltage V 0 of the DAC 100.
  • the resistance of the resistor R2 is selected to be much larger than the resistance of the sampling resistor R1, most of the output current of the DC power source flows through the sampling resistor R1, and the current shunted through the resistor R2 is very small and can be ignored. Therefore, the sampling resistor R1 can approximately sample the output current of the DC power supply.
  • the current control unit 101 can control the output current of the DC power supply through the output voltage of the DAC 100 so that the magnitude of the current value transmitted on the two-wire signal transmission line corresponds to the measurement result.
  • the current bleeder unit includes: an operational amplifier U3, a transistor J1, resistors R6, R7, R8, R9, and a voltage regulator Z1;
  • the inverting terminal of the operational amplifier U3 is connected to the first terminal of the resistor R6 and the first terminal of the resistor R7, the second terminal of the resistor R6 is connected to the first terminal of the capacitor C1, and the second terminal of the capacitor C1 is grounded.
  • the second end of the resistor R7 is grounded;
  • the capacitor C1 is an energy storage element;
  • the non-inverting terminal of the operational amplifier U3 is connected to the reference voltage V ref ;
  • the output terminal of the operational amplifier U3 is connected to the base of the transistor J1, the collector of the transistor J1 is connected to the first terminal of the resistor R9, and the second terminal of the resistor R9 is connected to the first terminal of the capacitor C1; the transistor J1 Of the emitter is grounded.
  • the output terminal of the operational amplifier U3 outputs a voltage U 1.
  • the transistor is turned on. bleed through the transistor J1 electric energy, until the voltage on C1 is less than or equal to the reduced U 2, the transistor J1 is turned off, the current discharge is stopped.
  • the values of the voltages U 0 and U 2 are related to the reference voltage V ref . By adjusting the value of the reference voltage V ref , the discharge threshold of the energy storage capacitor C1 can be adjusted.
  • Voltage regulator Z1 conducts current discharge through the voltage regulator when the voltage across the capacitor C1 exceeds the voltage regulation value of the voltage regulator.
  • the radar level measurement system further includes: a display and operation module 50;
  • the display and operation module 50 is connected to the power supply module 10 and the control and signal processing module 40 respectively, and is configured to perform human-computer interaction.
  • At least one embodiment of the present invention provides a power supply method for a radar level measurement system, including:
  • Step S110 the control and signal processing module controls the switch module to turn on to power on the radar RF signal processing module;
  • Step S120 After the radar RF signal processing module is powered on, it transmits and receives the radar RF signal, converts the received radar RF signal into a radar digital signal and outputs it to the control and signal processing module;
  • Step S130 After the control and signal processing module receives the radar digital signal, the control switch module is turned off to power off the radar RF signal processing module, data processing is performed on the radar digital signal to obtain a measurement result, and the power supply module is controlled to change the output of the DC power supply Current, the magnitude of the output current represents the value of the measurement result.
  • intermittent power-on of the radar RF signal processing module can reduce the power consumption of the radar RF signal processing module, so that the entire radar level measurement system can still meet the power consumption requirements under the condition of minimum transmission current power supply.
  • the control and signal processing module controls the radar RF signal processing module to be powered off for the first time, which minimizes the power-on time of the radar RF signal processing module and further reduces the overall Power consumption of radar level measurement system.
  • control and signal processing module controls the switch module to turn on and power on the radar RF signal processing module, including: the control and signal processing module periodically controls the switch module to turn on to make the radar RF signal processing module periodically turn on Electricity.
  • periodically powering on the radar RF signal processing module compared to always powering on the radar RF signal processing module can further save power consumption of the radar level measurement system.
  • control and signal processing module includes: a main control chip and a digital signal processing DSP chip;
  • the control and signal processing module controls the switch module to turn on and power on the radar RF signal processing module, including: the DSP chip controls the switch module to turn on to power on the radar RF signal processing module;
  • the control switch module After the control and signal processing module receives the radar digital signal, the control switch module is turned off to power off the radar RF signal processing module, including: after the DSP chip receives the radar digital signal, the control switch module is turned off to cause the radar RF signal processing module Power off
  • the control and signal processing module processes the radar digital signal to obtain a measurement result, and controls the power supply module to change the output current of the DC power supply, including: a DSP chip performs data processing on the radar digital signal to obtain a measurement result, and then performs the measurement The result is sent to the main control chip; after receiving the measurement result, the main control chip controls the power supply module to change the output current of the DC power supply.
  • the method further includes:
  • the DSP chip After the DSP chip sends the measurement result to the main control chip, it enters sleep mode or low power consumption mode;
  • the method further includes:
  • the DSP chip exits the sleep mode or low power consumption mode after receiving the wake-up signal of the main control chip;
  • the control and signal processing module controls the switch module to turn on to power on the radar RF signal processing module, including:
  • the switch module is turned on to power on the radar RF signal processing module
  • the method further includes:
  • the main control chip periodically sends a wake-up signal to the DSP chip.
  • the radar level measurement system and its power supply method of the present application are further described below by examples.
  • This example provides a radar level measurement system.
  • the radar level measurement system adopts a two-wire system design, the power line and the signal line are multiplexed, and the signal current value ranges from 4mA to 20mA.
  • the radar level measurement system of this example includes: a power supply module 1 and a load circuit 2; wherein, the load circuit 2 includes: a switch module 20, a radar RF signal processing module 30, and a control and signal processing module 40.
  • the power supply module includes: a current control unit 101, an energy storage unit 102, a current discharge unit 103 and a voltage reduction unit 104, and the energy storage unit includes an energy storage element.
  • the input end of the current control unit is connected to the DC power supply, and the output end is connected to the energy storage unit, which is set to change the output current of the DC power supply under the control of the control and signal processing module; the input end of the energy storage unit is connected to the current control unit, and the output end is connected to the drop
  • the pressure unit is set to store the electrical energy of the DC power supply through the energy storage element; the current discharge unit is connected to the energy storage unit and is set to discharge current when the voltage across the energy storage element exceeds the threshold; the input end of the voltage reduction unit is connected to the energy storage unit
  • the output terminal of the unit is connected to the load circuit, and is set to reduce the voltage output by the energy storage unit to a multi-channel power supply voltage and output it to the load circuit.
  • the control and signal processing module includes: a main control chip 401 and a digital signal processing DSP chip 402.
  • the main control chip is configured to receive the measurement result sent by the DSP chip, and control the power supply module to change the output current of the DC power supply, and the magnitude of the output current represents the value of the measurement result.
  • the DSP chip is set to control the switch module to be turned on to power on the radar RF signal processing module; after receiving the radar digital signal sent by the radar RF signal processing module, the switch module is turned off to enable the radar RF signal processing The module is powered off; data processing is performed on the radar digital signal to obtain a measurement result, and the measurement result is sent to the main control chip;
  • the radar radio frequency signal processing module is configured to transmit and receive radar radio frequency signals, convert the received radar radio frequency signals into radar digital signals, and output to the DSP chip.
  • the radar RF signal processing module can be implemented using a single radar sensor chip.
  • the radar digital signal processing function is usually integrated on the chip to perform data processing such as FFT operation on the radar digital signal.
  • the radar hardware accelerator in Fig. 8 is set to perform radar digital signal processing. In order to save power consumption of the radar sensor chip, this example does not use the radar hardware accelerator built into the chip.
  • the main control chip When the main control chip has timed out, it sends a wake-up signal to the DSP chip. After receiving the wake-up signal, the DSP chip exits the sleep mode, and then controls the switch module to turn on, the radar sensor chip is powered on, and the radar main processor controls the radar RF signal processing
  • the radio frequency signal processor drives the ramp generator to work, and the ramp generator controls the voltage controlled oscillator (VCO) to generate a radio frequency signal (such as 20GHz).
  • VCO voltage controlled oscillator
  • the radio frequency signal (such as 20GHz) passes through a frequency multiplier (such as 4 frequency multiplication )
  • the frequency doubling is a high-frequency signal (such as 80 GHz), and the high-frequency signal (such as 80 GHz) is amplified by a power amplifier, and then the high-frequency signal (such as 80 GHz) is transmitted through an antenna.
  • the echo signal of the transmitted signal is received by the antenna.
  • the received signal passes through a low-noise amplifier and a mixer to obtain an intermediate frequency signal.
  • the intermediate frequency signal is converted into a radar digital signal by an analog-to-digital converter (ADC).
  • ADC analog-to-digital converter
  • the radar digital signal passes The radar RF signal processor sends to the radar main processor.
  • the radar main processor After receiving the radar digital signal, the radar main processor does not call the radar hardware accelerator built in the chip, but sends the radar digital signal to the DSP chip.
  • the control switch module After the DSP chip receives the radar digital signal, the control switch module is turned off, and the radar sensor chip is powered off.
  • the DSP chip processes the radar digital signal (for example, fast Fourier transform FFT operation and logarithm operation), and obtains the measurement result after processing and sends it to the main control chip.
  • the DSP chip enters the sleep mode after sending the measurement result to the main control chip, thereby reducing power consumption.
  • the main control chip After receiving the measurement result sent by the DSP chip, the main control chip converts the measurement result into a control voltage V 0.
  • the main control chip has a built-in digital-to-analog converter DAC100, and the output current of the DC power supply is controlled by the output voltage V 0 of the DAC100 so that The magnitude of the current value transmitted on the two-wire signal transmission line corresponds to the measurement result.
  • the current control unit includes: a first operational amplifier U1, a second operational amplifier U2, resistors R1, R2, R3, R4, R5, switch tubes Q1 and Q2; the first operational amplifier The inverting input terminal of U1 is respectively connected to the first end of the resistor R2 and the first end of the switching transistor Q1, the second end of the resistor R2 is connected to the positive electrode of the DC power supply, and the negative electrode of the DC power supply is grounded; the first operation The non-inverting input end of the amplifier U1 is connected to the first end of the resistor R3, and the second end of the resistor R3 is respectively connected to the second end of the resistor R1 and the first end of the switch Q2; the first end of the resistor R1 is connected to the positive pole of the DC power supply
  • the output terminal of the first operational amplifier U1 is connected to the second terminal of the switch tube Q1; the non-inverting input terminal of the second operational amplifier U2 is connected to the output terminal of the DAC100; the inverting input
  • the current bleeder unit includes: an operational amplifier U3, a transistor J1, resistors R6, R7, R8, R9, and a voltage regulator Z1; the inverting end of the operational amplifier U3 is connected to a resistor R6 And the first end of the resistor R7, the second end of the resistor R6 is connected to the first end of the capacitor C1, the second end of the capacitor C1 is grounded, and the second end of the resistor R7 is grounded;
  • the capacitor C1 is an energy storage element;
  • the non-inverting end of the operational amplifier U3 is connected to the reference voltage V ref ;
  • the output end of the operational amplifier U3 is connected to the base of the transistor J1, and the collector of the transistor J1 is connected to the first end of the resistor R9
  • the second end of the resistor R9 is connected to the first end of the capacitor C1; the emitter of the transistor J1 is grounded.
  • the radar level measurement system in the above example can save the power consumption of the radar sensor chip by intermittently powering on the radar sensor chip, so that the power consumption of the two-wire radar level measurement system meets the safety and explosion-proof requirements of the industrial site.
  • the DSP chip controls the radar sensor chip to be powered on periodically. After receiving the radar digital signal output from the radar sensor chip, the DSP chip controls the radar sensor chip to be powered off for the first time, which minimizes the power-on time and further reduces the radar sensor chip.
  • the DSP chip assumes the radar digital signal processing function, and the DSP chip can enter the sleep state when the radar digital signal is not processed, thereby further reducing the power consumption of the entire level measurement system.

Abstract

Disclosed herein are a radar level gauge system and a power supply method. The system comprises: a power supply module and a load circuit, the power supply module being configured to convert electrical energy of a direct current power supply into a preset voltage by means of energy storage and voltage reduction, and to supply power to the load circuit; a radar radio frequency signal processing module configured to transmit and receive a radar radio frequency signal, convert the received radar radio frequency signal into a radar digital signal, and to output the same to a control and signal processing module; a switch module configured to connect a power supply terminal of the radar radio frequency signal processing module when turned on, and to disconnect the power supply terminal of the radar radio frequency signal processing module when turned off; and the control and signal processing module configured to control the switch module to turn on or off, such that the radar radio frequency signal processing module is energized intermittently, so as to perform data processing upon receiving the radar digital signal to obtain a measurement result, and to control the power supply module to change an output current of the direct current power supply, such that the current indicates a numerical value of the measurement result.

Description

一种雷达物位测量系统及其供电方法Radar level measurement system and its power supply method 技术领域Technical field
本文涉及测量领域，尤其涉及的是一种雷达物位测量系统及其供电方法。This article relates to the field of measurement, especially to a radar level measurement system and its power supply method.
背景技术Background technique
雷达物位计是物位测量领域一种常用的计量仪器，具有测量精准、性能稳定、可靠性高、维护简便、适用范围广等优点。雷达物位计可安装于各种金属、非金属容器或管道内，对液体、浆料及颗粒料的物位进行非接触式连续测量。随着雷达物位计向着智能化、小型化的发展，现在的雷达物位计通常采用单芯片雷达传感器进行测量。Radar level gauge is a commonly used measuring instrument in the field of level measurement. It has the advantages of accurate measurement, stable performance, high reliability, easy maintenance, and wide application range. The radar level gauge can be installed in various metal, non-metallic containers or pipelines to perform non-contact continuous measurement of the liquid, slurry and granular material levels. With the development of radar level gauges towards intelligence and miniaturization, current radar level gauges usually use single-chip radar sensors for measurement.
两线制接口是一种工业仪表的常用接口，通过将供电线与信号线合二为一，大大节省了施工和线缆成本，给现场施工和后期维护带来了极大的便利。The two-wire interface is a common interface for industrial instruments. By combining the power supply line and the signal line, the construction and cable costs are greatly saved, which brings great convenience to on-site construction and post-maintenance.
采用两线制接口供电的设备，为了使设备能够在最小传输电流供电情况下依然正常工作，对设备的低功耗提出了更高的要求。In order to enable the device to work normally with the minimum transmission current power supply, the device using a two-wire interface power supply puts forward higher requirements for the low power consumption of the device.
发明概述Summary of the invention
以下是对本文详细描述的主题的概述。本概述并非是为了限制权利要求的保护范围。The following is an overview of the topics detailed in this article. This summary is not intended to limit the scope of protection of the claims.
本文提供一种雷达物位测量系统及其供电方法，能够满足两线制雷达物位测量系统的功耗要求。This paper provides a radar level measurement system and its power supply method, which can meet the power consumption requirements of a two-wire radar level measurement system.
本发明实施例提供一种雷达物位测量系统，包括：供电模块和负载电路；所述负载电路包括：开关模块，雷达射频信号处理模块，控制及信号处理模块；An embodiment of the present invention provides a radar level measurement system, including: a power supply module and a load circuit; the load circuit includes: a switch module, a radar radio frequency signal processing module, a control and signal processing module;
所述供电模块，设置为将直流电源的电能通过储能和降压转换为设定的 电压并为负载电路供电；The power supply module is configured to convert the electric energy of the DC power supply to a set voltage through energy storage and voltage reduction and supply power to the load circuit;
雷达射频信号处理模块，设置为发射并接收雷达射频信号，将接收到的雷达射频信号转换为雷达数字信号输出至控制及信号处理模块；The radar radio frequency signal processing module is set to transmit and receive radar radio frequency signals, convert the received radar radio frequency signals into radar digital signals and output to the control and signal processing module;
开关模块，设置为导通时接通雷达射频信号处理模块的供电端，断开时断开雷达射频信号处理模块的供电端；The switch module is set to turn on the power supply end of the radar RF signal processing module when it is turned on, and disconnect the power supply end of the radar RF signal processing module when it is turned off;
控制及信号处理模块，设置为控制开关模块的导通和断开使所述雷达射频信号处理模块间歇上电；在接收到雷达数字信号后，对所述雷达数字信号进行数据处理得到测量结果，控制供电模块改变直流电源的输出电流，所述输出电流的大小表示所述测量结果的数值。The control and signal processing module is configured to control the on and off of the switch module to intermittently power on the radar RF signal processing module; after receiving the radar digital signal, perform data processing on the radar digital signal to obtain a measurement result, The power supply module is controlled to change the output current of the DC power supply, and the magnitude of the output current represents the value of the measurement result.
在示例性实施例中，控制及信号处理模块，设置为采用以下方式控制开关模块断开：在接收完毕雷达射频信号处理模块发送的雷达数字信号后，控制开关模块断开使所述雷达射频信号处理模块断电。In an exemplary embodiment, the control and signal processing module is configured to control the switch module to be turned off in the following manner: after receiving the radar digital signal sent by the radar radio frequency signal processing module, the control switch module is turned off to make the radar radio frequency signal The processing module is powered off.
在示例性实施例中，控制及信号处理模块，设置为采用以下方式控制开关模块导通：定时控制开关模块导通使所述雷达射频信号处理模块周期性上电。In an exemplary embodiment, the control and signal processing module is configured to control the switch module to be turned on in the following manner: timing the switch module to be turned on to periodically power on the radar radio frequency signal processing module.
在示例性实施例中，所述控制及信号处理模块，包括：主控芯片和数字信号处理DSP芯片；In an exemplary embodiment, the control and signal processing module includes: a main control chip and a digital signal processing DSP chip;
所述主控芯片，设置为接收所述DSP芯片发送的测量结果，控制供电模块改变直流电源的输出电流，所述输出电流的大小表示所述测量结果的数值；The main control chip is configured to receive the measurement result sent by the DSP chip, and control the power supply module to change the output current of the DC power supply, and the magnitude of the output current represents the value of the measurement result;
所述DSP芯片，设置为控制开关模块导通使所述雷达射频信号处理模块上电；在接收完毕雷达射频信号处理模块发送的雷达数字信号后，控制开关模块断开使所述雷达射频信号处理模块断电；对所述雷达数字信号进行数据处理得到测量结果，将所述测量结果发送至所述主控芯片。The DSP chip is set to control the switch module to be turned on to power on the radar RF signal processing module; after receiving the radar digital signal sent by the radar RF signal processing module, the switch module is turned off to enable the radar RF signal processing The module is powered off; data processing is performed on the radar digital signal to obtain a measurement result, and the measurement result is sent to the main control chip.
在示例性实施例中，所述DSP芯片，还设置为在将所述测量结果发送至所述主控芯片后，进入休眠模式或低功耗模式。In an exemplary embodiment, the DSP chip is further configured to enter a sleep mode or a low power consumption mode after sending the measurement result to the main control chip.
在示例性实施例中，所述DSP芯片，还设置为接收到主控芯片的唤醒信号后退出休眠模式或低功耗模式；在退出休眠模式或低功耗模式后，控制 开关模块导通使所述雷达射频信号处理模块上电；In an exemplary embodiment, the DSP chip is further configured to exit the sleep mode or low power consumption mode after receiving the wake-up signal of the main control chip; after exiting the sleep mode or low power consumption mode, control the switch module to turn on The radar RF signal processing module is powered on;
所述主控芯片，还设置为定时向所述DSP芯片发送唤醒信号。The main control chip is also set to periodically send a wake-up signal to the DSP chip.
在示例性实施例中，所述供电模块包括：电流控制单元、储能单元、电流泄放单元和降压单元；储能单元包括储能元件；In an exemplary embodiment, the power supply module includes: a current control unit, an energy storage unit, a current discharge unit, and a voltage reduction unit; the energy storage unit includes an energy storage element;
电流控制单元的输入端连接直流电源，输出端连接储能单元，设置为在控制及信号处理模块的控制下改变直流电源的输出电流；The input end of the current control unit is connected to the DC power supply, and the output end is connected to the energy storage unit, which is set to change the output current of the DC power supply under the control of the control and signal processing module;
储能单元的输入端连接电流控制单元，输出端连接降压单元，设置为通过储能元件储存直流电源的电能；The input end of the energy storage unit is connected to the current control unit, and the output end is connected to the step-down unit, which is set to store the electric energy of the DC power supply through the energy storage element;
电流泄放单元连接储能单元，设置为当储能元件两端的电压超过阈值时进行电流泄放；The current bleeder unit is connected to the energy storage unit and is set to discharge the current when the voltage across the energy storage element exceeds the threshold;
降压单元的输入端连接储能单元，输出端连接负载电路，设置为将储能单元输出的电压降低为多路电源电压，输出至负载电路。The input end of the step-down unit is connected to the energy storage unit, and the output end is connected to the load circuit, which is set to reduce the voltage output by the energy storage unit to a multi-channel power supply voltage and output to the load circuit.
在示例性实施例中，所述电流控制单元包括：第一运算放大器U1，第二运算放大器U2，电阻R1，R2，R3，R4，R5，开关管Q1和Q2；In an exemplary embodiment, the current control unit includes: a first operational amplifier U1, a second operational amplifier U2, resistors R1, R2, R3, R4, R5, switch tubes Q1 and Q2;
所述雷达物位测量系统还包括：数模转换器DAC100；所述DAC100与所述控制及信号处理模块连接或内置在所述控制及信号处理模块内，设置为将测量结果转换为控制电流信号的电压信号；The radar level measurement system further includes: a digital-to-analog converter DAC100; the DAC100 is connected to the control and signal processing module or built into the control and signal processing module, and is configured to convert the measurement result into a control current signal Voltage signal
所述第一运算放大器U1的反相输入端分别连接电阻R2的第一端和开关管Q1的第一端，电阻R2的第二端连接所述直流电源的正极，所述直流电源的负极接地；所述第一运算放大器U1的同相输入端连接电阻R3的第一端，电阻R3的第二端分别连接电阻R1的第二端和开关管Q2的第一端；电阻R1的第一端连接所述直流电源的正极；所述第一运算放大器U1的输出端连接开关管Q1的第二端；The inverting input end of the first operational amplifier U1 is connected to the first end of the resistor R2 and the first end of the switching tube Q1 respectively, the second end of the resistor R2 is connected to the positive pole of the DC power supply, and the negative pole of the DC power supply is grounded ; The non-inverting input end of the first operational amplifier U1 is connected to the first end of the resistor R3, the second end of the resistor R3 is respectively connected to the second end of the resistor R1 and the first end of the switch Q2; the first end of the resistor R1 is connected The positive pole of the DC power supply; the output end of the first operational amplifier U1 is connected to the second end of the switch tube Q1;
所述第二运算放大器U2的同相输入端连接DAC100的输出端；所述第二运算放大器U2的反相输入端连接电阻R4的第一端，电阻R4的第二端分别连接开关管Q1的第三端和电阻R5的第一端；电阻R5的第二端接地；所述第二运算放大器U2的输出端连接开关管Q2的第二端；所述开关管Q2的第三端作为所述电流控制单元101的输出端。The non-inverting input end of the second operational amplifier U2 is connected to the output end of the DAC 100; the inverting input end of the second operational amplifier U2 is connected to the first end of the resistor R4, and the second end of the resistor R4 is connected to the first end of the switch Q1 respectively Three terminals and the first terminal of the resistor R5; the second terminal of the resistor R5 is grounded; the output terminal of the second operational amplifier U2 is connected to the second terminal of the switch tube Q2; the third terminal of the switch tube Q2 is used as the current The output of the control unit 101.
在示例性实施例中，所述电流泄放单元包括：运算放大器U3，三极管J1，电阻R6，R7，R8，R9，和稳压管Z1；In an exemplary embodiment, the current bleeder unit includes: an operational amplifier U3, a transistor J1, resistors R6, R7, R8, R9, and a voltage regulator Z1;
所述运算放大器U3的反相端连接电阻R6的第一端和电阻R7的第一端，所述电阻R6的第二端连接电容C1的第一端，所述电容C1的第二端接地，所述电阻R7的第二端接地；所述电容C1是储能元件；The inverting terminal of the operational amplifier U3 is connected to the first terminal of the resistor R6 and the first terminal of the resistor R7, the second terminal of the resistor R6 is connected to the first terminal of the capacitor C1, and the second terminal of the capacitor C1 is grounded. The second end of the resistor R7 is grounded; the capacitor C1 is an energy storage element;
所述运算放大器U3的同相端连接参考电压V ref； The non-inverting terminal of the operational amplifier U3 is connected to the reference voltage V ref ;
所述运算放大器U3的输出端连接晶体管J1的基极，所述晶体管J1的集电极连接电阻R9的第一端，所述电阻R9的第二端连接电容C1的第一端；所述晶体管J1的发射极接地。The output terminal of the operational amplifier U3 is connected to the base of the transistor J1, the collector of the transistor J1 is connected to the first terminal of the resistor R9, and the second terminal of the resistor R9 is connected to the first terminal of the capacitor C1; the transistor J1 Of the emitter is grounded.
在示例性实施例中，所述雷达射频信号处理模块是雷达传感器芯片。In an exemplary embodiment, the radar radio frequency signal processing module is a radar sensor chip.
本发明实施例提供一种雷达物位测量系统的供电方法，包括：An embodiment of the present invention provides a power supply method for a radar level measurement system, including:
控制及信号处理模块控制开关模块导通使雷达射频信号处理模块上电；The control and signal processing module controls the switch module to turn on to power on the radar RF signal processing module;
雷达射频信号处理模块上电后，发射并接收雷达射频信号，将接收到的雷达射频信号转换为雷达数字信号并输出至控制及信号处理模块；After the radar RF signal processing module is powered on, it transmits and receives the radar RF signal, converts the received radar RF signal into a radar digital signal and outputs it to the control and signal processing module;
控制及信号处理模块接收到雷达数字信号后，控制开关模块断开使雷达射频信号处理模块断电，对所述雷达数字信号进行数据处理得到测量结果，控制供电模块改变直流电源的输出电流，所述输出电流的大小表示所述测量结果的数值。After the control and signal processing module receives the radar digital signal, the control switch module is turned off to power off the radar RF signal processing module, data processing is performed on the radar digital signal to obtain a measurement result, and the power supply module is controlled to change the output current of the DC power supply. The magnitude of the output current indicates the value of the measurement result.
在示例性实施例中，所述控制及信号处理模块控制开关模块导通使雷达射频信号处理模块上电，包括：In an exemplary embodiment, the control and signal processing module controls the switch module to turn on to power on the radar RF signal processing module, including:
控制及信号处理模块定时控制开关模块导通使雷达射频信号处理模块上电。The control and signal processing module regularly controls the switch module to be turned on to power on the radar RF signal processing module.
在示例性实施例中，所述控制及信号处理模块包括：主控芯片和数字信号处理DSP芯片；In an exemplary embodiment, the control and signal processing module includes: a main control chip and a digital signal processing DSP chip;
所述控制及信号处理模块控制开关模块导通使雷达射频信号处理模块上电，包括：DSP芯片控制开关模块导通使雷达射频信号处理模块上电；The control and signal processing module controls the switch module to turn on and power on the radar RF signal processing module, including: the DSP chip controls the switch module to turn on to power on the radar RF signal processing module;
所述控制及信号处理模块接收到雷达数字信号后，控制开关模块断开使 雷达射频信号处理模块断电，包括：DSP芯片接收到雷达数字信号后，控制开关模块断开使雷达射频信号处理模块断电；After the control and signal processing module receives the radar digital signal, the control switch module is turned off to power off the radar RF signal processing module, which includes: after the DSP chip receives the radar digital signal, the control switch module is disconnected to turn off the radar RF signal processing module Power off
所述控制及信号处理模块对所述雷达数字信号进行处理得到测量结果，控制供电模块改变直流电源的输出电流，包括：DSP芯片对所述雷达数字信号进行数据处理得到测量结果，将所述测量结果发送至主控芯片；主控芯片接收到测量结果后，控制供电模块改变直流电源的输出电流。The control and signal processing module processes the radar digital signal to obtain a measurement result, and controls the power supply module to change the output current of the DC power supply, including: a DSP chip performs data processing on the radar digital signal to obtain a measurement result, and then performs the measurement The result is sent to the main control chip; after receiving the measurement result, the main control chip controls the power supply module to change the output current of the DC power supply.
在示例性实施例中，所述方法还包括：In an exemplary embodiment, the method further includes:
DSP芯片将测量结果发送至主控芯片后，进入休眠模式或低功耗模式；After the DSP chip sends the measurement result to the main control chip, it enters sleep mode or low power consumption mode;
DSP芯片在接收到主控芯片的唤醒信号后退出休眠模式或低功耗模式；The DSP chip exits the sleep mode or low power consumption mode after receiving the wake-up signal of the main control chip;
所述控制及信号处理模块控制开关模块导通使雷达射频信号处理模块上电，包括：The control and signal processing module controls the switch module to turn on to power on the radar RF signal processing module, including:
DSP芯片在退出休眠模式或低功耗模式后，控制开关模块导通使所述雷达射频信号处理模块上电。After the DSP chip exits the sleep mode or the low power consumption mode, the switch module is controlled to be turned on to power on the radar radio frequency signal processing module.
与相关技术相比，本发明实施例提供的雷达物位测量系统及其供电方法，通过间歇为雷达射频信号处理模块供电能够减少雷达射频信号处理模块的耗电量，从而满足两线制雷达物位测量系统的功耗要求。在一些实施方式中，控制及信号处理模块控制雷达射频信号处理模块周期性上电，控制及信号处理模块在接收到雷达射频信号处理模块输出的雷达数字信号后，第一时间控制雷达射频信号处理模块断电，最大限度缩短了雷达射频信号处理模块的上电时间，进一步降低了整个雷达物位测量系统的功耗。由控制及信号处理模块承担雷达数字信号处理功能，可以通过使负责雷达数据处理的DSP芯片在不处理雷达数字信号时进入休眠或低功耗状态，从而进一步降低整个物位测量系统的功耗。Compared with the related art, the radar level measurement system and the power supply method provided by the embodiments of the present invention can reduce the power consumption of the radar RF signal processing module by intermittently supplying power to the radar RF signal processing module, thereby satisfying the two-wire radar object Power consumption requirements of a bit measurement system. In some embodiments, the control and signal processing module controls the radar RF signal processing module to periodically power on, and after receiving the radar digital signal output from the radar RF signal processing module, the control and signal processing module controls the radar RF signal processing for the first time The module is powered off, which minimizes the power-on time of the radar RF signal processing module and further reduces the power consumption of the entire radar level measurement system. The radar digital signal processing function is assumed by the control and signal processing module. The DSP chip responsible for radar data processing can be put into sleep or low power consumption state when the radar digital signal is not processed, thereby further reducing the power consumption of the entire level measurement system.
在阅读并理解了附图和详细描述后，可以明白其他方面。After reading and understanding the drawings and detailed description, other aspects can be understood.
附图概述Brief description of the drawings
图1为本发明实施例中一种雷达物位测量系统的示意图；1 is a schematic diagram of a radar level measurement system in an embodiment of the present invention;
图2-a为本发明实施例中一种控制及信号处理模块的示意图；Figure 2-a is a schematic diagram of a control and signal processing module in an embodiment of the invention;
图2-b为本发明实施例中另一种控制及信号处理模块的示意图；Figure 2-b is a schematic diagram of another control and signal processing module in an embodiment of the present invention;
图3为本发明实施例中一种供电模块的示意图；3 is a schematic diagram of a power supply module in an embodiment of the present invention;
图4-a为本发明实施例中一种电流控制单元的示意图；Figure 4-a is a schematic diagram of a current control unit in an embodiment of the present invention;
图4-b为本发明实施例中一种电流泄放单元的示意图；Fig. 4-b is a schematic diagram of a current discharge unit according to an embodiment of the present invention;
图5为本发明实施例中一种雷达物位测量系统(带显示操作模块)的示意图；5 is a schematic diagram of a radar level measurement system (with display operation module) according to an embodiment of the present invention;
图6为本发明实施例中一种雷达物位测量系统的供电方法流程图；6 is a flowchart of a power supply method of a radar level measurement system according to an embodiment of the present invention;
图7为本发明示例1的雷达物位测量系统示意图；7 is a schematic diagram of a radar level measurement system of Example 1 of the present invention;
图8为本发明示例1中单芯片雷达传感器的示意图。8 is a schematic diagram of a single-chip radar sensor in Example 1 of the present invention.
附图标记Reference number
1供电模块；2负载电路；20开关模块；30雷达射频信号处理模块；40控制及信号处理模块；50显示及操作模块；1 power supply module; 2 load circuit; 20 switch module; 30 radar RF signal processing module; 40 control and signal processing module; 50 display and operation module;
101电流控制单元；102储能单元；103电流泄放单元；104降压单元；101 current control unit; 102 energy storage unit; 103 current discharge unit; 104 buck unit;
401主控芯片；402 DSP芯片；401 main control chip; 402 DSP chip;
100数模转换器DAC。100 digital-to-analog converter DAC.
详述Elaborate
下文中将结合附图对本申请实施例的技术方案进行详细说明。The technical solutions of the embodiments of the present application will be described in detail below with reference to the drawings.
本申请说明书以及权利要求书中使用的“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性，而只是用来区分不同的组成部分。“连接”或者“相连”等类似的词语并非限定于物理的或者机械的连接，而是可以包括电性的连接，不管是直接的还是间接的。The words “first”, “second” and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Connected" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.
如图1所示，本发明至少一个实施例提供了一种雷达物位测量系统，包括：供电模块1和负载电路2；所述负载电路2包括：开关模块20，雷达射 频信号处理模块30，控制及信号处理模块40；As shown in FIG. 1, at least one embodiment of the present invention provides a radar level measurement system, including: a power supply module 1 and a load circuit 2; the load circuit 2 includes: a switch module 20, a radar RF signal processing module 30, Control and signal processing module 40;
所述供电模块，设置为将直流电源的电能通过储能和降压转换为设定的电压并为负载电路供电；The power supply module is configured to convert the electric energy of the DC power supply to a set voltage through energy storage and voltage reduction and supply power to the load circuit;
雷达射频信号处理模块，设置为发射并接收雷达射频信号，将接收到的雷达射频信号转换为雷达数字信号输出至控制及信号处理模块；The radar radio frequency signal processing module is set to transmit and receive radar radio frequency signals, convert the received radar radio frequency signals into radar digital signals and output to the control and signal processing module;
开关模块，设置为导通时接通雷达射频信号处理模块的供电端，断开时断开雷达射频信号处理模块的供电端；The switch module is set to turn on the power supply end of the radar RF signal processing module when it is turned on, and disconnect the power supply end of the radar RF signal processing module when it is turned off;
控制及信号处理模块，设置为控制开关模块的导通和断开使所述雷达射频信号处理模块间歇上电；在接收到雷达数字信号后，对所述雷达数字信号进行数据处理得到测量结果，控制供电模块改变直流电源的输出电流，所述输出电流的大小表示所述测量结果的数值。The control and signal processing module is configured to control the on and off of the switch module to intermittently power on the radar RF signal processing module; after receiving the radar digital signal, perform data processing on the radar digital signal to obtain a measurement result, The power supply module is controlled to change the output current of the DC power supply, and the magnitude of the output current represents the value of the measurement result.
在上述实施方式中，雷达射频信号处理模块间歇上电能够减少雷达射频信号处理模块的耗电量，使得在最小传输电流供电情况下整个雷达物位测量系统仍然能够满足功耗要求。In the above embodiment, intermittent power-up of the radar RF signal processing module can reduce the power consumption of the radar RF signal processing module, so that the entire radar level measurement system can still meet the power consumption requirement under the condition of minimum transmission current power supply.
在一种实施方式中，控制及信号处理模块，设置为采用以下方式控制开关模块断开：在接收完毕雷达射频信号处理模块发送的雷达数字信号后，控制开关模块断开使所述雷达射频信号处理模块断电。In one embodiment, the control and signal processing module is configured to control the switch module to be turned off in the following manner: after receiving the radar digital signal sent by the radar RF signal processing module, the control switch module is turned off to make the radar RF signal The processing module is powered off.
在上述实施方式中，控制及信号处理模块在接收到雷达射频信号处理模块输出的雷达数字信号后，第一时间控制雷达射频信号处理模块断电，最大限度缩短了雷达射频信号处理模块的上电时间，进一步降低了整个雷达物位测量系统的功耗。In the above embodiment, after receiving the radar digital signal output from the radar RF signal processing module, the control and signal processing module controls the radar RF signal processing module to be powered off for the first time, thus minimizing the power on of the radar RF signal processing module Time further reduces the power consumption of the entire radar level measurement system.
在一种实施方式中，控制及信号处理模块，设置为采用以下方式控制开关模块导通：定时控制开关模块导通使所述雷达射频信号处理模块周期性上电。In one embodiment, the control and signal processing module is configured to control the switch module to be turned on in the following manner: timing the switch module to be turned on to periodically power on the radar RF signal processing module.
在上述实施方式中，使雷达射频信号处理模块周期性上电相对于一直为雷达射频信号处理模块上电，能够更加节省雷达物位测量系统的功耗。In the above-mentioned embodiment, periodically powering on the radar RF signal processing module compared to always powering on the radar RF signal processing module can further save power consumption of the radar level measurement system.
在一种实施方式中，控制及信号处理模块对所述雷达数字信号进行的数据处理包括：FFT(Fast Fourier Transformation，快速傅里叶变换)运算；In one embodiment, the data processing performed by the control and signal processing module on the radar digital signal includes: FFT (Fast Fourier Transformation) operation;
在一种实施方式中，所述雷达射频信号处理模块采用雷达传感器芯片实现。In one embodiment, the radar RF signal processing module is implemented using a radar sensor chip.
相关技术中，雷达传感器芯片上一般集成有雷达射频信号处理子系统和雷达数字信号处理子系统，因此，雷达传感器芯片的功耗较大。雷达传感器芯片上的雷达射频信号处理子系统先工作，生成雷达数字信号，然后雷达传感器芯片上的雷达数字信号处理子系统再开始工作，进行雷达数字信号处理(比如，FFT运算、取对数运算)，由于数字信号运算时间较长，因此整个芯片处于长时间耗电状态。In the related art, a radar radio frequency signal processing subsystem and a radar digital signal processing subsystem are generally integrated on the radar sensor chip. Therefore, the power consumption of the radar sensor chip is large. The radar RF signal processing subsystem on the radar sensor chip works first to generate radar digital signals, and then the radar digital signal processing subsystem on the radar sensor chip starts working again to perform radar digital signal processing (for example, FFT operation, logarithm operation ), because the digital signal computing time is longer, so the entire chip is in a long-term power consumption state.
而本申请的技术方案，如果雷达传感器芯片上同时集成有雷达射频信号处理子系统和雷达数字信号处理子系统(雷达硬件加速器)，也仅仅利用雷达传感器芯片上的雷达射频信号处理子系统，并不使用芯片内部的雷达硬件加速器。一旦雷达射频信号处理子系统从天线接收到雷达射频信号并处理为雷达数字信号后，就将所述雷达数字信号输出到所述雷达传感器芯片之外，然后由控制及信号处理模块控制开关模块断开使雷达传感器芯片断电，从而使雷达传感器芯片处于短时工作状态，节省整个物位测量系统的功耗。In the technical solution of the present application, if a radar RF signal processing subsystem and a radar digital signal processing subsystem (radar hardware accelerator) are integrated on the radar sensor chip, only the radar RF signal processing subsystem on the radar sensor chip is used, and The radar hardware accelerator inside the chip is not used. Once the radar RF signal processing subsystem receives the radar RF signal from the antenna and processes it as a radar digital signal, it outputs the radar digital signal out of the radar sensor chip, and then the control and signal processing module controls the switch module to turn off Turning off the radar sensor chip, so that the radar sensor chip is in a short-term working state, saving power consumption of the entire level measurement system.
在一种实施方式中，如图2-a所示，所述控制及信号处理模块40，包括：主控芯片401和数字信号处理DSP芯片402；In one embodiment, as shown in FIG. 2-a, the control and signal processing module 40 includes: a main control chip 401 and a digital signal processing DSP chip 402;
所述主控芯片，设置为接收所述DSP芯片发送的测量结果，控制供电模块改变直流电源的输出电流，所述输出电流的大小表示所述测量结果的数值；The main control chip is configured to receive the measurement result sent by the DSP chip, and control the power supply module to change the output current of the DC power supply, and the magnitude of the output current represents the value of the measurement result;
所述DSP芯片，设置为控制开关模块导通使所述雷达射频信号处理模块上电；在接收完毕雷达射频信号处理模块发送的雷达数字信号后，控制开关模块断开使所述雷达射频信号处理模块断电；对所述雷达数字信号进行数据处理得到测量结果，将所述测量结果发送至所述主控芯片。The DSP chip is set to control the switch module to be turned on to power on the radar RF signal processing module; after receiving the radar digital signal sent by the radar RF signal processing module, the switch module is turned off to enable the radar RF signal processing The module is powered off; data processing is performed on the radar digital signal to obtain a measurement result, and the measurement result is sent to the main control chip.
在一种实施方式中，如图2-b所示，所述控制及信号处理模块40，包括：主控芯片401和数字信号处理DSP芯片402；In one embodiment, as shown in FIG. 2-b, the control and signal processing module 40 includes: a main control chip 401 and a digital signal processing DSP chip 402;
所述主控芯片，设置为控制开关模块导通使所述雷达射频信号处理模块上电，向DSP芯片发送第一通知消息；接收到第二通知消息后，控制开关 模块断开使所述雷达射频信号处理模块断电，接收到测量结果后，控制供电模块改变直流电源的输出电流，所述输出电流的大小表示所述测量结果的数值；The main control chip is configured to control the switch module to turn on to power on the radar RF signal processing module and send a first notification message to the DSP chip; after receiving the second notification message, control the switch module to turn off to make the radar The RF signal processing module is powered off, and after receiving the measurement result, the power supply module is controlled to change the output current of the DC power supply, and the magnitude of the output current represents the value of the measurement result;
所述DSP芯片，设置为接收到第一通知消息后做信号接收准备，在接收完毕雷达射频信号处理模块发送的雷达数字信号后，向所述主控芯片发送第二通知消息，对所述雷达数字信号进行数据处理得到测量结果，将所述测量结果发送至所述主控芯片；The DSP chip is configured to prepare for signal reception after receiving the first notification message, and after receiving the radar digital signal sent by the radar RF signal processing module, send a second notification message to the main control chip to the radar The digital signal performs data processing to obtain a measurement result, and sends the measurement result to the main control chip;
上述实施方式中，将控制功能和数字信号处理功能通过两块独立的芯片分别负责，一般地，DSP芯片擅长运算处理，而控制芯片可以不关注计算性能，控制和计算分开设置能够优化系统设计，利于芯片选型。In the above embodiment, the control function and the digital signal processing function are respectively responsible for two separate chips. Generally, the DSP chip is good at arithmetic processing, and the control chip can pay no attention to the calculation performance. The separate setting of control and calculation can optimize the system design. Conducive to chip selection.
在一种实施方式中，所述DSP芯片，还设置为在将所述测量结果发送至所述主控芯片后，进入休眠模式或低功耗模式。In one embodiment, the DSP chip is further configured to enter a sleep mode or a low power consumption mode after sending the measurement result to the main control chip.
在上述实施方式中，DSP芯片在处理完雷达数据后就进入休眠或低功耗模式，能够进一步节省雷达物位测量系统的功耗。In the above embodiment, the DSP chip enters the sleep or low power consumption mode after processing the radar data, which can further save the power consumption of the radar level measurement system.
在一种实施方式中，所述DSP芯片，还设置为接收到主控芯片的唤醒信号后退出休眠模式或低功耗模式；在退出休眠模式或低功耗模式后，控制开关模块导通使所述雷达射频信号处理模块上电；In one embodiment, the DSP chip is further configured to exit the sleep mode or low power consumption mode after receiving the wake-up signal of the main control chip; after exiting the sleep mode or low power consumption mode, control the switch module to turn on The radar RF signal processing module is powered on;
所述主控芯片，还设置为定时向所述DSP芯片发送唤醒信号；The main control chip is also set to periodically send a wake-up signal to the DSP chip;
在上述实施方式中，主控芯片上一般都集成了定时器，因此，可以由主控芯片定时唤醒DSP芯片。In the above embodiment, a timer is generally integrated on the main control chip, so the main control chip can periodically wake up the DSP chip.
在一种实施方式中，如图3所示，所述供电模块包括：电流控制单元101、储能单元102、电流泄放单元103和降压单元104；储能单元包括储能元件；In one embodiment, as shown in FIG. 3, the power supply module includes: a current control unit 101, an energy storage unit 102, a current discharge unit 103, and a voltage reduction unit 104; the energy storage unit includes an energy storage element;
电流控制单元的输入端连接直流电源，输出端连接储能单元，设置为在控制及信号处理模块的控制下改变直流电源的输出电流；The input end of the current control unit is connected to the DC power supply, and the output end is connected to the energy storage unit, which is set to change the output current of the DC power supply under the control of the control and signal processing module;
储能单元的输入端连接电流控制单元，输出端连接降压单元，设置为通过储能元件储存直流电源的电能；The input end of the energy storage unit is connected to the current control unit, and the output end is connected to the step-down unit, which is set to store the electric energy of the DC power supply through the energy storage element;
电流泄放单元连接储能单元，设置为当储能元件两端的电压超过阈值时 进行电流泄放；The current bleeder unit is connected to the energy storage unit and is set to discharge the current when the voltage across the energy storage element exceeds the threshold;
降压单元的输入端连接储能单元，输出端连接负载电路，设置为将储能单元输出的电压降低为多路电源电压，输出至负载电路。The input end of the step-down unit is connected to the energy storage unit, and the output end is connected to the load circuit, which is set to reduce the voltage output by the energy storage unit to a multi-channel power supply voltage and output to the load circuit.
在一种实施方式中，所述储能元件包括：电容；In one embodiment, the energy storage element includes: a capacitor;
在一种实施方式中，如图4-a所示，所述电流控制单元101包括：第一运算放大器U1，第二运算放大器U2，电阻R1，R2，R3，R4，R5，开关管Q1和Q2；In one embodiment, as shown in FIG. 4-a, the current control unit 101 includes: a first operational amplifier U1, a second operational amplifier U2, resistors R1, R2, R3, R4, R5, a switching transistor Q1 and Q2;
所述雷达物位测量系统还包括：数模转换器DAC100；所述DAC100与所述控制及信号处理模块连接或内置在所述控制及信号处理模块内，设置为将测量结果转换为控制电流信号的电压信号；The radar level measurement system further includes: a digital-to-analog converter DAC100; the DAC100 is connected to the control and signal processing module or built into the control and signal processing module, and is configured to convert the measurement result into a control current signal Voltage signal
所述第一运算放大器U1的反相输入端分别连接电阻R2的第一端和开关管Q1的第一端，电阻R2的第二端连接所述直流电源的正极，所述直流电源的负极接地；所述第一运算放大器U1的同相输入端连接电阻R3的第一端，电阻R3的第二端分别连接电阻R1的第二端和开关管Q2的第一端；电阻R1的第一端连接所述直流电源的正极；所述第一运算放大器U1的输出端连接开关管Q1的第二端；The inverting input end of the first operational amplifier U1 is connected to the first end of the resistor R2 and the first end of the switching tube Q1 respectively, the second end of the resistor R2 is connected to the positive pole of the DC power supply, and the negative pole of the DC power supply is grounded The non-inverting input of the first operational amplifier U1 is connected to the first end of the resistor R3, the second end of the resistor R3 is respectively connected to the second end of the resistor R1 and the first end of the switching tube Q2; the first end of the resistor R1 is connected The positive pole of the DC power supply; the output end of the first operational amplifier U1 is connected to the second end of the switch tube Q1;
所述第二运算放大器U2的同相输入端连接DAC100的输出端；所述第二运算放大器U2的反相输入端连接电阻R4的第一端，电阻R4的第二端分别连接开关管Q1的第三端和电阻R5的第一端；电阻R5的第二端接地；所述第二运算放大器U2的输出端连接开关管Q2的第二端；所述开关管Q2的第三端作为所述电流控制单元101的输出端。The non-inverting input terminal of the second operational amplifier U2 is connected to the output terminal of the DAC100; the inverting input terminal of the second operational amplifier U2 is connected to the first terminal of the resistor R4, and the second terminal of the resistor R4 is connected to the first terminal of the switching tube Q1, respectively Three terminals and the first terminal of the resistor R5; the second terminal of the resistor R5 is grounded; the output terminal of the second operational amplifier U2 is connected to the second terminal of the switch tube Q2; the third terminal of the switch tube Q2 is used as the current The output of the control unit 101.
在上述电流控制单元101中，电阻R1是采样电阻，设置为采样直流电源的输出电流。假设流过采样电阻R1的电流为I。根据运算放大器的电气特点，流经R3的电流为零，因为运算放大器的同相输入端与反相输入端电压相同，因此，电阻R2和采样电阻R1上的压降相同，U R1＝U R2。 In the above-described current control unit 101, the resistor R1 is a sampling resistor and is set to sample the output current of the DC power supply. Assume that the current flowing through the sampling resistor R1 is I. According to the electrical characteristics of the operational amplifier, the current flowing through R3 is zero, because the voltage at the non-inverting input terminal and the inverting input terminal of the operational amplifier is the same. Therefore, the voltage drop across the resistor R2 and the sampling resistor R1 is the same, U R1 =U R2 .
开关管Q1的第二端(栅极)是控制端，开关管Q1导通时，流经R2的电流从开关管Q1的第一端流向开关管Q1的第二端，并流过电阻R5。根据运算放大器的电气特点，流经R4的电流为零，I R2＝I R5。 The second end (gate) of the switch Q1 is the control end. When the switch Q1 is turned on, the current flowing through R2 flows from the first end of the switch Q1 to the second end of the switch Q1, and flows through the resistor R5. According to the electrical characteristics of the operational amplifier, the current flowing through R4 is zero, and I R2 =I R5 .
改变DAC100的输出电压V 0会导致第二运算放大器U2调节开关管Q2，通过改变电流I使得第二运算放大器U2的反相输入端的电压总是等于同相输入端的电压，即V 0＝I*R1/R2*R5。 Changing the output voltage V 0 of the DAC100 will cause the second operational amplifier U2 to adjust the switching transistor Q2. By changing the current I, the voltage at the inverting input terminal of the second operational amplifier U2 is always equal to the voltage at the non-inverting input terminal, that is, V 0 =I*R1 /R2*R5.
也即：I＝V 0/R5*R2/R1＝V 0*[R2/(R1*R5)]； That is: I=V 0 /R5*R2/R1=V 0 *[R2/(R1*R5)];
假设a＝[R2/(R1*R5)]，则I＝a*V 0； Assuming a=[R2/(R1*R5)], then I=a*V 0 ;
因此，流过采样电阻R1的电流I可以通过DAC100的输出电压V 0来调节。当选取电阻R2的阻值远远大于采样电阻R1的阻值时，直流电源的输出电流大部分都流过采样电阻R1，通过电阻R2分流的电流很少，可以忽略不计。因此，通过采样电阻R1可以近似采样直流电源的输出电流。 Therefore, the current I flowing through the sampling resistor R1 can be adjusted by the output voltage V 0 of the DAC 100. When the resistance of the resistor R2 is selected to be much larger than the resistance of the sampling resistor R1, most of the output current of the DC power source flows through the sampling resistor R1, and the current shunted through the resistor R2 is very small and can be ignored. Therefore, the sampling resistor R1 can approximately sample the output current of the DC power supply.
因此，电流控制单元101可以通过DAC100的输出电压控制直流电源的输出电流，使得两线制信号传输线上传输的电流值的大小与测量结果相对应。Therefore, the current control unit 101 can control the output current of the DC power supply through the output voltage of the DAC 100 so that the magnitude of the current value transmitted on the two-wire signal transmission line corresponds to the measurement result.
在一种实施方式中，如图4-b所示，所述电流泄放单元包括：运算放大器U3，三极管J1，电阻R6，R7，R8，R9，和稳压管Z1；In one embodiment, as shown in FIG. 4-b, the current bleeder unit includes: an operational amplifier U3, a transistor J1, resistors R6, R7, R8, R9, and a voltage regulator Z1;
所述运算放大器U3的反相端连接电阻R6的第一端和电阻R7的第一端，所述电阻R6的第二端连接电容C1的第一端，所述电容C1的第二端接地，所述电阻R7的第二端接地；所述电容C1是储能元件；The inverting terminal of the operational amplifier U3 is connected to the first terminal of the resistor R6 and the first terminal of the resistor R7, the second terminal of the resistor R6 is connected to the first terminal of the capacitor C1, and the second terminal of the capacitor C1 is grounded. The second end of the resistor R7 is grounded; the capacitor C1 is an energy storage element;
所述运算放大器U3的同相端连接参考电压V ref； The non-inverting terminal of the operational amplifier U3 is connected to the reference voltage V ref ;
所述运算放大器U3的输出端连接晶体管J1的基极，所述晶体管J1的集电极连接电阻R9的第一端，所述电阻R9的第二端连接电容C1的第一端；所述晶体管J1的发射极接地。The output terminal of the operational amplifier U3 is connected to the base of the transistor J1, the collector of the transistor J1 is connected to the first terminal of the resistor R9, and the second terminal of the resistor R9 is connected to the first terminal of the capacitor C1; the transistor J1 Of the emitter is grounded.
上述电流泄放单元的电路中，当电容C1两端的电压超过U 0时，运算放大器U3的输出端输出电压U 1，当电压U 1超过晶体管的导通门限时，晶体管导通，C1上的电能通过晶体管J1进行泄放，直到C1上的电压降低为小于或等于U 2时，晶体管J1截止，电流泄放停止。电压U 0和U 2的取值和参考电压V ref有关，通过调节参考电压V ref的值，可以调整储能电容C1的泄放阈值。 In the circuit of the above current discharge unit, when the voltage across the capacitor C1 exceeds U 0 , the output terminal of the operational amplifier U3 outputs a voltage U 1. When the voltage U 1 exceeds the conduction threshold of the transistor, the transistor is turned on. bleed through the transistor J1 electric energy, until the voltage on C1 is less than or equal to the reduced U 2, the transistor J1 is turned off, the current discharge is stopped. The values of the voltages U 0 and U 2 are related to the reference voltage V ref . By adjusting the value of the reference voltage V ref , the discharge threshold of the energy storage capacitor C1 can be adjusted.
稳压管Z1在电容C1两端的电压超过稳压管的稳压值时，通过稳压管进行电流泄放。Voltage regulator Z1 conducts current discharge through the voltage regulator when the voltage across the capacitor C1 exceeds the voltage regulation value of the voltage regulator.
在一种实施方式中，如图5所示，所述雷达物位测量系统还包括：显示及操作模块50；In one embodiment, as shown in FIG. 5, the radar level measurement system further includes: a display and operation module 50;
所述显示及操作模块50分别连接供电模块10和控制及信号处理模块40，设置为进行人机交互。The display and operation module 50 is connected to the power supply module 10 and the control and signal processing module 40 respectively, and is configured to perform human-computer interaction.
如图6所示，本发明至少一个实施例提供了一种雷达物位测量系统的供电方法，包括：As shown in FIG. 6, at least one embodiment of the present invention provides a power supply method for a radar level measurement system, including:
步骤S110：控制及信号处理模块控制开关模块导通使雷达射频信号处理模块上电；Step S110: the control and signal processing module controls the switch module to turn on to power on the radar RF signal processing module;
步骤S120：雷达射频信号处理模块上电后，发射并接收雷达射频信号，将接收到的雷达射频信号转换为雷达数字信号并输出至控制及信号处理模块；Step S120: After the radar RF signal processing module is powered on, it transmits and receives the radar RF signal, converts the received radar RF signal into a radar digital signal and outputs it to the control and signal processing module;
步骤S130：控制及信号处理模块接收到雷达数字信号后，控制开关模块断开使雷达射频信号处理模块断电，对所述雷达数字信号进行数据处理得到测量结果，控制供电模块改变直流电源的输出电流，所述输出电流的大小表示所述测量结果的数值。Step S130: After the control and signal processing module receives the radar digital signal, the control switch module is turned off to power off the radar RF signal processing module, data processing is performed on the radar digital signal to obtain a measurement result, and the power supply module is controlled to change the output of the DC power supply Current, the magnitude of the output current represents the value of the measurement result.
上述实施方式中，雷达射频信号处理模块间歇上电能够减少雷达射频信号处理模块的耗电量，使得在最小传输电流供电情况下整个雷达物位测量系统仍然能够满足功耗要求。控制及信号处理模块在接收到雷达射频信号处理模块输出的雷达数字信号后，第一时间控制雷达射频信号处理模块断电，最大限度缩短了雷达射频信号处理模块的上电时间，进一步降低了整个雷达物位测量系统的功耗。In the above embodiment, intermittent power-on of the radar RF signal processing module can reduce the power consumption of the radar RF signal processing module, so that the entire radar level measurement system can still meet the power consumption requirements under the condition of minimum transmission current power supply. After receiving the radar digital signal output from the radar RF signal processing module, the control and signal processing module controls the radar RF signal processing module to be powered off for the first time, which minimizes the power-on time of the radar RF signal processing module and further reduces the overall Power consumption of radar level measurement system.
在一种实施方式中，控制及信号处理模块控制开关模块导通使雷达射频信号处理模块上电，包括：控制及信号处理模块定时控制开关模块导通使所述雷达射频信号处理模块周期性上电。In one embodiment, the control and signal processing module controls the switch module to turn on and power on the radar RF signal processing module, including: the control and signal processing module periodically controls the switch module to turn on to make the radar RF signal processing module periodically turn on Electricity.
在上述实施方式中，使雷达射频信号处理模块周期性上电相对于一直为雷达射频信号处理模块上电，能够更加节省雷达物位测量系统的功耗。In the above-mentioned embodiment, periodically powering on the radar RF signal processing module compared to always powering on the radar RF signal processing module can further save power consumption of the radar level measurement system.
在一种实施方式中，所述控制及信号处理模块包括：主控芯片和数字信 号处理DSP芯片；In one embodiment, the control and signal processing module includes: a main control chip and a digital signal processing DSP chip;
所述控制及信号处理模块控制开关模块导通使雷达射频信号处理模块上电，包括：DSP芯片控制开关模块导通使雷达射频信号处理模块上电；The control and signal processing module controls the switch module to turn on and power on the radar RF signal processing module, including: the DSP chip controls the switch module to turn on to power on the radar RF signal processing module;
所述控制及信号处理模块接收到雷达数字信号后，控制开关模块断开使雷达射频信号处理模块断电，包括：DSP芯片接收到雷达数字信号后，控制开关模块断开使雷达射频信号处理模块断电；After the control and signal processing module receives the radar digital signal, the control switch module is turned off to power off the radar RF signal processing module, including: after the DSP chip receives the radar digital signal, the control switch module is turned off to cause the radar RF signal processing module Power off
所述控制及信号处理模块对所述雷达数字信号进行处理得到测量结果，控制供电模块改变直流电源的输出电流，包括：DSP芯片对所述雷达数字信号进行数据处理得到测量结果，将所述测量结果发送至主控芯片；主控芯片接收到测量结果后，控制供电模块改变直流电源的输出电流。The control and signal processing module processes the radar digital signal to obtain a measurement result, and controls the power supply module to change the output current of the DC power supply, including: a DSP chip performs data processing on the radar digital signal to obtain a measurement result, and then performs the measurement The result is sent to the main control chip; after receiving the measurement result, the main control chip controls the power supply module to change the output current of the DC power supply.
在一种实施方式中，所述方法还包括：In one embodiment, the method further includes:
DSP芯片将测量结果发送至主控芯片后，进入休眠模式或低功耗模式；After the DSP chip sends the measurement result to the main control chip, it enters sleep mode or low power consumption mode;
在一种实施方式中，所述方法还包括：In one embodiment, the method further includes:
DSP芯片在接收到主控芯片的唤醒信号后退出休眠模式或低功耗模式；The DSP chip exits the sleep mode or low power consumption mode after receiving the wake-up signal of the main control chip;
所述控制及信号处理模块控制开关模块导通使雷达射频信号处理模块上电，包括：The control and signal processing module controls the switch module to turn on to power on the radar RF signal processing module, including:
DSP芯片在退出休眠模式或低功耗模式后，控制开关模块导通使所述雷达射频信号处理模块上电；After the DSP chip exits the sleep mode or the low power consumption mode, the switch module is turned on to power on the radar RF signal processing module;
在一种实施方式中，所述方法还包括：In one embodiment, the method further includes:
所述主控芯片定时向所述DSP芯片发送唤醒信号。The main control chip periodically sends a wake-up signal to the DSP chip.
下面通过示例进一步说明本申请的雷达物位测量系统及其供电方法。The radar level measurement system and its power supply method of the present application are further described below by examples.
示例1Example 1
本示例提供一种雷达物位测量系统。所述雷达物位测量系统采用两线制设计，其电源线与信号线复用，信号电流值的范围为4mA～20mA。This example provides a radar level measurement system. The radar level measurement system adopts a two-wire system design, the power line and the signal line are multiplexed, and the signal current value ranges from 4mA to 20mA.
如图7所示，本示例的雷达物位测量系统包括：供电模块1和负载电路2；其中，负载电路2包括：开关模块20，雷达射频信号处理模块30，控制 及信号处理模块40。As shown in FIG. 7, the radar level measurement system of this example includes: a power supply module 1 and a load circuit 2; wherein, the load circuit 2 includes: a switch module 20, a radar RF signal processing module 30, and a control and signal processing module 40.
所述供电模块包括：电流控制单元101，储能单元102，电流泄放单元103和降压单元104，储能单元包括储能元件。电流控制单元的输入端连接直流电源，输出端连接储能单元，设置为在控制及信号处理模块的控制下改变直流电源的输出电流；储能单元的输入端连接电流控制单元，输出端连接降压单元，设置为通过储能元件储存直流电源的电能；电流泄放单元连接储能单元，设置为当储能元件两端的电压超过阈值时进行电流泄放；降压单元的输入端连接储能单元，输出端连接负载电路，设置为将储能单元输出的电压降低为多路电源电压，输出至负载电路。The power supply module includes: a current control unit 101, an energy storage unit 102, a current discharge unit 103 and a voltage reduction unit 104, and the energy storage unit includes an energy storage element. The input end of the current control unit is connected to the DC power supply, and the output end is connected to the energy storage unit, which is set to change the output current of the DC power supply under the control of the control and signal processing module; the input end of the energy storage unit is connected to the current control unit, and the output end is connected to the drop The pressure unit is set to store the electrical energy of the DC power supply through the energy storage element; the current discharge unit is connected to the energy storage unit and is set to discharge current when the voltage across the energy storage element exceeds the threshold; the input end of the voltage reduction unit is connected to the energy storage unit The output terminal of the unit is connected to the load circuit, and is set to reduce the voltage output by the energy storage unit to a multi-channel power supply voltage and output it to the load circuit.
所述控制及信号处理模块包括：主控芯片401和数字信号处理DSP芯片402。所述主控芯片，设置为接收所述DSP芯片发送的测量结果，控制供电模块改变直流电源的输出电流，所述输出电流的大小表示所述测量结果的数值。所述DSP芯片，设置为控制开关模块导通使所述雷达射频信号处理模块上电；在接收完毕雷达射频信号处理模块发送的雷达数字信号后，控制开关模块断开使所述雷达射频信号处理模块断电；对所述雷达数字信号进行数据处理得到测量结果，将所述测量结果发送至所述主控芯片；The control and signal processing module includes: a main control chip 401 and a digital signal processing DSP chip 402. The main control chip is configured to receive the measurement result sent by the DSP chip, and control the power supply module to change the output current of the DC power supply, and the magnitude of the output current represents the value of the measurement result. The DSP chip is set to control the switch module to be turned on to power on the radar RF signal processing module; after receiving the radar digital signal sent by the radar RF signal processing module, the switch module is turned off to enable the radar RF signal processing The module is powered off; data processing is performed on the radar digital signal to obtain a measurement result, and the measurement result is sent to the main control chip;
所述雷达射频信号处理模块，设置为发射并接收雷达射频信号，将接收到的雷达射频信号转换为雷达数字信号输出至DSP芯片。The radar radio frequency signal processing module is configured to transmit and receive radar radio frequency signals, convert the received radar radio frequency signals into radar digital signals, and output to the DSP chip.
如图8所示，雷达射频信号处理模块可以采用单个雷达传感器芯片实现。一般通用的雷达传感器芯片，芯片上通常会集成雷达数字信号处理功能，对雷达数字信号进行FFT运算等数据处理。图8中的雷达硬件加速器设置为进行雷达数字信号处理。为了节省雷达传感器芯片的功耗，本示例不使用芯片内置的雷达硬件加速器。As shown in Figure 8, the radar RF signal processing module can be implemented using a single radar sensor chip. A general-purpose radar sensor chip. The radar digital signal processing function is usually integrated on the chip to perform data processing such as FFT operation on the radar digital signal. The radar hardware accelerator in Fig. 8 is set to perform radar digital signal processing. In order to save power consumption of the radar sensor chip, this example does not use the radar hardware accelerator built into the chip.
主控芯片定时时间到，向DSP芯片发送唤醒信号，DSP芯片接收到所述唤醒信号后，退出休眠模式，然后控制开关模块导通，雷达传感器芯片上电，雷达主处理器控制雷达射频信号处理器工作，雷达射频信号处理器驱动斜坡发生器工作，斜坡发生器控制压控振荡器(VCO)产生射频信号(比如20GHz)，所述射频信号(比如20GHz)通过倍频器(比如4倍频)倍频为高频信号(比如80GHz)，经过功率放大器放大所述高频信号(比如80GHz)， 然后通过天线发射所述高频信号(比如80GHz)。所述发射信号的回波信号被天线接收，接收信号经过低噪放大器、混频器得到中频信号，所述中频信号经过模数转换器(ADC)转换成雷达数字信号，所述雷达数字信号通过雷达射频信号处理器发送至雷达主处理器。雷达主处理器接收到雷达数字信号后，不调用芯片内置的雷达硬件加速器，而是将所述雷达数字信号发送至DSP芯片。DSP芯片接收完毕所述雷达数字信号后，控制开关模块断开，雷达传感器芯片断电。在雷达传感器芯片断电期间，DSP芯片对雷达数字信号进行处理(比如，快速傅里叶变换FFT运算，取对数运算)，处理后得到测量结果发送给主控芯片。DSP芯片在将所述测量结果发送至所述主控芯片后，进入休眠模式，从而降低功耗。When the main control chip has timed out, it sends a wake-up signal to the DSP chip. After receiving the wake-up signal, the DSP chip exits the sleep mode, and then controls the switch module to turn on, the radar sensor chip is powered on, and the radar main processor controls the radar RF signal processing The radio frequency signal processor drives the ramp generator to work, and the ramp generator controls the voltage controlled oscillator (VCO) to generate a radio frequency signal (such as 20GHz). The radio frequency signal (such as 20GHz) passes through a frequency multiplier (such as 4 frequency multiplication ) The frequency doubling is a high-frequency signal (such as 80 GHz), and the high-frequency signal (such as 80 GHz) is amplified by a power amplifier, and then the high-frequency signal (such as 80 GHz) is transmitted through an antenna. The echo signal of the transmitted signal is received by the antenna. The received signal passes through a low-noise amplifier and a mixer to obtain an intermediate frequency signal. The intermediate frequency signal is converted into a radar digital signal by an analog-to-digital converter (ADC). The radar digital signal passes The radar RF signal processor sends to the radar main processor. After receiving the radar digital signal, the radar main processor does not call the radar hardware accelerator built in the chip, but sends the radar digital signal to the DSP chip. After the DSP chip receives the radar digital signal, the control switch module is turned off, and the radar sensor chip is powered off. During the power failure of the radar sensor chip, the DSP chip processes the radar digital signal (for example, fast Fourier transform FFT operation and logarithm operation), and obtains the measurement result after processing and sends it to the main control chip. The DSP chip enters the sleep mode after sending the measurement result to the main control chip, thereby reducing power consumption.
主控芯片接收到DSP芯片发送的测量结果后，将所述测量结果换算为控制电压V 0，主控芯片内置数模转换器DAC100，通过DAC100的输出电压V 0控制直流电源的输出电流，使得两线制信号传输线上传输的电流值的大小与测量结果相对应。 After receiving the measurement result sent by the DSP chip, the main control chip converts the measurement result into a control voltage V 0. The main control chip has a built-in digital-to-analog converter DAC100, and the output current of the DC power supply is controlled by the output voltage V 0 of the DAC100 so that The magnitude of the current value transmitted on the two-wire signal transmission line corresponds to the measurement result.
如图4-a所示，所述电流控制单元包括：第一运算放大器U1，第二运算放大器U2，电阻R1，R2，R3，R4，R5，开关管Q1和Q2；所述第一运算放大器U1的反相输入端分别连接电阻R2的第一端和开关管Q1的第一端，电阻R2的第二端连接所述直流电源的正极，所述直流电源的负极接地；所述第一运算放大器U1的同相输入端连接电阻R3的第一端，电阻R3的第二端分别连接电阻R1的第二端和开关管Q2的第一端；电阻R1的第一端连接所述直流电源的正极；所述第一运算放大器U1的输出端连接开关管Q1的第二端；所述第二运算放大器U2的同相输入端连接DAC100的输出端；所述第二运算放大器U2的反相输入端连接电阻R4的第一端，电阻R4的第二端分别连接开关管Q1的第三端和电阻R5的第一端；电阻R5的第二端接地；所述第二运算放大器U2的输出端连接开关管Q2的第二端；所述开关管Q2的第三端作为所述电流控制单元101的输出端。As shown in Fig. 4-a, the current control unit includes: a first operational amplifier U1, a second operational amplifier U2, resistors R1, R2, R3, R4, R5, switch tubes Q1 and Q2; the first operational amplifier The inverting input terminal of U1 is respectively connected to the first end of the resistor R2 and the first end of the switching transistor Q1, the second end of the resistor R2 is connected to the positive electrode of the DC power supply, and the negative electrode of the DC power supply is grounded; the first operation The non-inverting input end of the amplifier U1 is connected to the first end of the resistor R3, and the second end of the resistor R3 is respectively connected to the second end of the resistor R1 and the first end of the switch Q2; the first end of the resistor R1 is connected to the positive pole of the DC power supply The output terminal of the first operational amplifier U1 is connected to the second terminal of the switch tube Q1; the non-inverting input terminal of the second operational amplifier U2 is connected to the output terminal of the DAC100; the inverting input terminal of the second operational amplifier U2 is connected The first end of the resistor R4 and the second end of the resistor R4 are respectively connected to the third end of the switch tube Q1 and the first end of the resistor R5; the second end of the resistor R5 is grounded; the output end of the second operational amplifier U2 is connected to the switch The second terminal of the tube Q2; the third terminal of the switch tube Q2 serves as the output terminal of the current control unit 101.
如图4-b所示，所述电流泄放单元包括：运算放大器U3，三极管J1，电阻R6，R7，R8，R9，和稳压管Z1；所述运算放大器U3的反相端连接电阻R6的第一端和电阻R7的第一端，所述电阻R6的第二端连接电容C1 的第一端，所述电容C1的第二端接地，所述电阻R7的第二端接地；所述电容C1是储能元件；所述运算放大器U3的同相端连接参考电压V ref；所述运算放大器U3的输出端连接晶体管J1的基极，所述晶体管J1的集电极连接电阻R9的第一端，所述电阻R9的第二端连接电容C1的第一端；所述晶体管J1的发射极接地。 As shown in Figure 4-b, the current bleeder unit includes: an operational amplifier U3, a transistor J1, resistors R6, R7, R8, R9, and a voltage regulator Z1; the inverting end of the operational amplifier U3 is connected to a resistor R6 And the first end of the resistor R7, the second end of the resistor R6 is connected to the first end of the capacitor C1, the second end of the capacitor C1 is grounded, and the second end of the resistor R7 is grounded; The capacitor C1 is an energy storage element; the non-inverting end of the operational amplifier U3 is connected to the reference voltage V ref ; the output end of the operational amplifier U3 is connected to the base of the transistor J1, and the collector of the transistor J1 is connected to the first end of the resistor R9 The second end of the resistor R9 is connected to the first end of the capacitor C1; the emitter of the transistor J1 is grounded.
上述示例中的雷达物位测量系统，通过间歇为雷达传感器芯片上电，能够节省雷达传感器芯片的功耗，从而使得两线制雷达物位测量系统的功耗满足工业现场的安全、防爆要求。DSP芯片控制雷达传感器芯片周期性上电，DSP芯片在接收到雷达传感器芯片输出的雷达数字信号后，第一时间控制雷达传感器芯片断电，最大限度缩短了雷达传感器芯片的上电时间，进一步降低了整个雷达物位测量系统的功耗。由DSP芯片承担雷达数字信号处理功能，可以通过使DSP芯片在不处理雷达数字信号时进入休眠状态，从而进一步降低整个物位测量系统的功耗。The radar level measurement system in the above example can save the power consumption of the radar sensor chip by intermittently powering on the radar sensor chip, so that the power consumption of the two-wire radar level measurement system meets the safety and explosion-proof requirements of the industrial site. The DSP chip controls the radar sensor chip to be powered on periodically. After receiving the radar digital signal output from the radar sensor chip, the DSP chip controls the radar sensor chip to be powered off for the first time, which minimizes the power-on time and further reduces the radar sensor chip. The power consumption of the entire radar level measurement system. The DSP chip assumes the radar digital signal processing function, and the DSP chip can enter the sleep state when the radar digital signal is not processed, thereby further reducing the power consumption of the entire level measurement system.

Claims (14)

  1. 一种雷达物位测量系统，包括：供电模块和负载电路；所述负载电路包括：开关模块，雷达射频信号处理模块，控制及信号处理模块；A radar level measurement system includes: a power supply module and a load circuit; the load circuit includes: a switch module, a radar radio frequency signal processing module, a control and signal processing module;
    所述供电模块，设置为将直流电源的电能通过储能和降压转换为设定的电压并为负载电路供电；The power supply module is configured to convert the electric energy of the DC power supply to a set voltage through energy storage and voltage reduction and supply power to the load circuit;
    雷达射频信号处理模块，设置为发射并接收雷达射频信号，将接收到的雷达射频信号转换为雷达数字信号输出至控制及信号处理模块；The radar radio frequency signal processing module is set to transmit and receive radar radio frequency signals, convert the received radar radio frequency signals into radar digital signals and output to the control and signal processing module;
    开关模块，设置为导通时接通雷达射频信号处理模块的供电端，断开时断开雷达射频信号处理模块的供电端；The switch module is set to turn on the power supply end of the radar RF signal processing module when it is turned on, and disconnect the power supply end of the radar RF signal processing module when it is turned off;
    控制及信号处理模块，设置为控制开关模块的导通和断开使所述雷达射频信号处理模块间歇上电；在接收到雷达数字信号后，对所述雷达数字信号进行数据处理得到测量结果，控制供电模块改变直流电源的输出电流，所述输出电流的大小表示所述测量结果的数值。The control and signal processing module is configured to control the on and off of the switch module to intermittently power on the radar RF signal processing module; after receiving the radar digital signal, perform data processing on the radar digital signal to obtain a measurement result, The power supply module is controlled to change the output current of the DC power supply, and the magnitude of the output current represents the value of the measurement result.
  2. 如权利要求1所述的雷达物位测量系统，其中：The radar level measurement system according to claim 1, wherein:
    控制及信号处理模块，设置为采用以下方式控制开关模块断开：在接收完毕雷达射频信号处理模块发送的雷达数字信号后，控制开关模块断开使所述雷达射频信号处理模块断电。The control and signal processing module is configured to control the switch module to be turned off in the following manner: after receiving the radar digital signal sent by the radar radio frequency signal processing module, the control switch module is turned off to power off the radar radio frequency signal processing module.
  3. 如权利要求2所述的雷达物位测量系统，其中：The radar level measurement system according to claim 2, wherein:
    控制及信号处理模块，设置为采用以下方式控制开关模块导通：定时控制开关模块导通使所述雷达射频信号处理模块周期性上电。The control and signal processing module is configured to control the switch module to be turned on in the following manner: timing the switch module to be turned on to periodically power on the radar RF signal processing module.
  4. 如权利要求1-3中任一项所述的雷达物位测量系统，其中：The radar level measurement system according to any one of claims 1-3, wherein:
    所述控制及信号处理模块，包括：主控芯片和数字信号处理DSP芯片；The control and signal processing module includes: a main control chip and a digital signal processing DSP chip;
    所述主控芯片，设置为接收所述DSP芯片发送的测量结果，控制供电模块改变直流电源的输出电流，所述输出电流的大小表示所述测量结果的数值；The main control chip is configured to receive the measurement result sent by the DSP chip, and control the power supply module to change the output current of the DC power supply, and the magnitude of the output current represents the value of the measurement result;
    所述DSP芯片，设置为控制开关模块导通使所述雷达射频信号处理模块上电；在接收完毕雷达射频信号处理模块发送的雷达数字信号后，控制开 关模块断开使所述雷达射频信号处理模块断电；对所述雷达数字信号进行数据处理得到测量结果，将所述测量结果发送至所述主控芯片。The DSP chip is set to control the switch module to be turned on to power on the radar RF signal processing module; after receiving the radar digital signal sent by the radar RF signal processing module, the switch module is turned off to enable the radar RF signal processing The module is powered off; data processing is performed on the radar digital signal to obtain a measurement result, and the measurement result is sent to the main control chip.
  5. 如权利要求4所述的雷达物位测量系统，其中：The radar level measurement system according to claim 4, wherein:
    所述DSP芯片，还设置为在将所述测量结果发送至所述主控芯片后，进入休眠模式或低功耗模式。The DSP chip is further configured to enter a sleep mode or a low power consumption mode after sending the measurement result to the main control chip.
  6. 如权利要求5所述的雷达物位测量系统，其中：The radar level measurement system according to claim 5, wherein:
    所述DSP芯片，还设置为接收到主控芯片的唤醒信号后退出休眠模式或低功耗模式；在退出休眠模式或低功耗模式后，控制开关模块导通使所述雷达射频信号处理模块上电；The DSP chip is also set to exit the sleep mode or low power consumption mode after receiving the wake-up signal of the main control chip; after exiting the sleep mode or low power consumption mode, control the switch module to turn on so that the radar RF signal processing module Power-on;
    所述主控芯片，还设置为定时向所述DSP芯片发送唤醒信号。The main control chip is also set to periodically send a wake-up signal to the DSP chip.
  7. 如权利要求1所述的雷达物位测量系统，其中：The radar level measurement system according to claim 1, wherein:
    所述供电模块包括：电流控制单元、储能单元、电流泄放单元和降压单元；储能单元包括储能元件；The power supply module includes: a current control unit, an energy storage unit, a current discharge unit and a voltage reduction unit; the energy storage unit includes an energy storage element;
    电流控制单元的输入端连接直流电源，输出端连接储能单元，设置为在控制及信号处理模块的控制下改变直流电源的输出电流；The input end of the current control unit is connected to the DC power supply, and the output end is connected to the energy storage unit, which is set to change the output current of the DC power supply under the control of the control and signal processing module;
    储能单元的输入端连接电流控制单元，输出端连接降压单元，设置为通过储能元件储存直流电源的电能；The input end of the energy storage unit is connected to the current control unit, and the output end is connected to the step-down unit, which is set to store the electric energy of the DC power supply through the energy storage element;
    电流泄放单元连接储能单元，设置为当储能元件两端的电压超过阈值时进行电流泄放；The current bleeder unit is connected to the energy storage unit and is set to discharge the current when the voltage across the energy storage element exceeds the threshold;
    降压单元的输入端连接储能单元，输出端连接负载电路，设置为将储能单元输出的电压降低为多路电源电压，输出至负载电路。The input end of the step-down unit is connected to the energy storage unit, and the output end is connected to the load circuit, which is set to reduce the voltage output by the energy storage unit to a multi-channel power supply voltage and output to the load circuit.
  8. 如权利要求7所述的雷达物位测量系统，其中：The radar level measurement system according to claim 7, wherein:
    所述电流控制单元包括：第一运算放大器U1，第二运算放大器U2，电阻R1，R2，R3，R4，R5，开关管Q1和Q2；The current control unit includes: a first operational amplifier U1, a second operational amplifier U2, resistors R1, R2, R3, R4, R5, switch tubes Q1 and Q2;
    所述雷达物位测量系统还包括：数模转换器DAC100；所述DAC100与所述控制及信号处理模块连接或内置在所述控制及信号处理模块内，设置为将测量结果转换为控制电流信号的电压信号；The radar level measurement system further includes: a digital-to-analog converter DAC100; the DAC100 is connected to the control and signal processing module or built into the control and signal processing module, and is configured to convert the measurement result into a control current signal Voltage signal
    所述第一运算放大器U1的反相输入端分别连接电阻R2的第一端和开关管Q1的第一端，电阻R2的第二端连接所述直流电源的正极，所述直流电源的负极接地；所述第一运算放大器U1的同相输入端连接电阻R3的第一端，电阻R3的第二端分别连接电阻R1的第二端和开关管Q2的第一端；电阻R1的第一端连接所述直流电源的正极；所述第一运算放大器U1的输出端连接开关管Q1的第二端；The inverting input end of the first operational amplifier U1 is connected to the first end of the resistor R2 and the first end of the switching tube Q1 respectively, the second end of the resistor R2 is connected to the positive pole of the DC power supply, and the negative pole of the DC power supply is grounded ; The non-inverting input end of the first operational amplifier U1 is connected to the first end of the resistor R3, the second end of the resistor R3 is respectively connected to the second end of the resistor R1 and the first end of the switch Q2; the first end of the resistor R1 is connected The positive pole of the DC power supply; the output end of the first operational amplifier U1 is connected to the second end of the switch tube Q1;
    所述第二运算放大器U2的同相输入端连接DAC100的输出端；所述第二运算放大器U2的反相输入端连接电阻R4的第一端，电阻R4的第二端分别连接开关管Q1的第三端和电阻R5的第一端；电阻R5的第二端接地；所述第二运算放大器U2的输出端连接开关管Q2的第二端；所述开关管Q2的第三端作为所述电流控制单元101的输出端。The non-inverting input terminal of the second operational amplifier U2 is connected to the output terminal of the DAC100; the inverting input terminal of the second operational amplifier U2 is connected to the first terminal of the resistor R4, and the second terminal of the resistor R4 is connected to the first terminal of the switching tube Q1, respectively Three terminals and the first terminal of the resistor R5; the second terminal of the resistor R5 is grounded; the output terminal of the second operational amplifier U2 is connected to the second terminal of the switch tube Q2; the third terminal of the switch tube Q2 is used as the current The output of the control unit 101.
  9. 如权利要求7所述的雷达物位测量系统，其中：The radar level measurement system according to claim 7, wherein:
    所述电流泄放单元包括：运算放大器U3，三极管J1，电阻R6，R7，R8，R9，和稳压管Z1；The current bleeder unit includes: an operational amplifier U3, a transistor J1, resistors R6, R7, R8, R9, and a voltage regulator Z1;
    所述运算放大器U3的反相端连接电阻R6的第一端和电阻R7的第一端，所述电阻R6的第二端连接电容C1的第一端，所述电容C1的第二端接地，所述电阻R7的第二端接地；所述电容C1是储能元件；The inverting terminal of the operational amplifier U3 is connected to the first terminal of the resistor R6 and the first terminal of the resistor R7, the second terminal of the resistor R6 is connected to the first terminal of the capacitor C1, and the second terminal of the capacitor C1 is grounded. The second end of the resistor R7 is grounded; the capacitor C1 is an energy storage element;
    所述运算放大器U3的同相端连接参考电压V ref； The non-inverting terminal of the operational amplifier U3 is connected to the reference voltage V ref ;
    所述运算放大器U3的输出端连接晶体管J1的基极，所述晶体管J1的集电极连接电阻R9的第一端，所述电阻R9的第二端连接电容C1的第一端；所述晶体管J1的发射极接地。The output terminal of the operational amplifier U3 is connected to the base of the transistor J1, the collector of the transistor J1 is connected to the first terminal of the resistor R9, and the second terminal of the resistor R9 is connected to the first terminal of the capacitor C1; the transistor J1 Of the emitter is grounded.
  10. 如权利要求1所述的雷达物位测量系统，其中：The radar level measurement system according to claim 1, wherein:
    所述雷达射频信号处理模块是雷达传感器芯片。The radar radio frequency signal processing module is a radar sensor chip.
  11. 一种权利要求1-10中任一项所述的雷达物位测量系统的供电方法，包括：A power supply method for a radar level measurement system according to any one of claims 1-10, comprising:
    控制及信号处理模块控制开关模块导通使雷达射频信号处理模块上电；The control and signal processing module controls the switch module to turn on to power on the radar RF signal processing module;
    雷达射频信号处理模块上电后，发射并接收雷达射频信号，将接收到的雷达射频信号转换为雷达数字信号并输出至控制及信号处理模块；After the radar RF signal processing module is powered on, it transmits and receives the radar RF signal, converts the received radar RF signal into a radar digital signal and outputs it to the control and signal processing module;
    控制及信号处理模块接收到雷达数字信号后，控制开关模块断开使雷达射频信号处理模块断电，对所述雷达数字信号进行数据处理得到测量结果，控制供电模块改变直流电源的输出电流，所述输出电流的大小表示所述测量结果的数值。After the control and signal processing module receives the radar digital signal, the control switch module is turned off to power off the radar RF signal processing module, data processing is performed on the radar digital signal to obtain a measurement result, and the power supply module is controlled to change the output current of the DC power supply. The magnitude of the output current indicates the value of the measurement result.
  12. 如权利要求11所述的供电方法，其中：The power supply method according to claim 11, wherein:
    所述控制及信号处理模块控制开关模块导通使雷达射频信号处理模块上电，包括：The control and signal processing module controls the switch module to turn on to power on the radar RF signal processing module, including:
    控制及信号处理模块定时控制开关模块导通使雷达射频信号处理模块上电。The control and signal processing module regularly controls the switch module to be turned on to power on the radar RF signal processing module.
  13. 如权利要求11所述的供电方法，其中：The power supply method according to claim 11, wherein:
    所述控制及信号处理模块包括：主控芯片和数字信号处理DSP芯片；The control and signal processing module includes: a main control chip and a digital signal processing DSP chip;
    所述控制及信号处理模块控制开关模块导通使雷达射频信号处理模块上电，包括：DSP芯片控制开关模块导通使雷达射频信号处理模块上电；The control and signal processing module controls the switch module to turn on and power on the radar RF signal processing module, including: the DSP chip controls the switch module to turn on to power on the radar RF signal processing module;
    所述控制及信号处理模块接收到雷达数字信号后，控制开关模块断开使雷达射频信号处理模块断电，包括：DSP芯片接收到雷达数字信号后，控制开关模块断开使雷达射频信号处理模块断电；After the control and signal processing module receives the radar digital signal, the control switch module is turned off to power off the radar RF signal processing module, including: after the DSP chip receives the radar digital signal, the control switch module is turned off to cause the radar RF signal processing module Power off
    所述控制及信号处理模块对所述雷达数字信号进行处理得到测量结果，控制供电模块改变直流电源的输出电流，包括：DSP芯片对所述雷达数字信号进行数据处理得到测量结果，将所述测量结果发送至主控芯片；主控芯片接收到测量结果后，控制供电模块改变直流电源的输出电流。The control and signal processing module processes the radar digital signal to obtain a measurement result, and controls the power supply module to change the output current of the DC power supply, including: a DSP chip performs data processing on the radar digital signal to obtain a measurement result, and then performs the measurement The result is sent to the main control chip; after receiving the measurement result, the main control chip controls the power supply module to change the output current of the DC power supply.
  14. 如权利要求13所述的供电方法，其中，所述方法还包括：The power supply method according to claim 13, wherein the method further comprises:
    DSP芯片将测量结果发送至主控芯片后，进入休眠模式或低功耗模式；After the DSP chip sends the measurement result to the main control chip, it enters sleep mode or low power consumption mode;
    DSP芯片在接收到主控芯片的唤醒信号后退出休眠模式或低功耗模式；The DSP chip exits the sleep mode or low power consumption mode after receiving the wake-up signal of the main control chip;
    所述控制及信号处理模块控制开关模块导通使雷达射频信号处理模块上电，包括：The control and signal processing module controls the switch module to turn on to power on the radar RF signal processing module, including:
    DSP芯片在退出休眠模式或低功耗模式后，控制开关模块导通使所述雷达射频信号处理模块上电。After the DSP chip exits the sleep mode or the low power consumption mode, the switch module is controlled to be turned on to power on the radar radio frequency signal processing module.
PCT/CN2019/087277 2018-12-18 2019-05-16 Radar level gauge system, and power supply method for same WO2020124947A1 (en)

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