Frequency shift keying communication circuit with adjustable output power and detectable load power

Abstract

The utility model discloses a frequency shift keying communication circuit with adjustable output power and detectable load power, which comprises a local driving unit and a far-end slave equipment unit, and is characterized in that the local driving unit comprises a local master control module, a local detection and voltage regulation module and a local line transmission module; the remote slave equipment unit comprises a remote line transmission module, the local detection and voltage regulation module comprises a Hall current sensor and a programmable resistor chip, and the programmable resistor chip and the local line transmission module are both connected with the Hall current sensor; the Hall current sensor, the programmable resistor chip and the local line transmission module are connected with the local master control module, and the local line transmission module is connected with the far-end line transmission module. According to the utility model, the output power can be remotely adjusted, the load power can be detected in real time, the design cost can be reduced, the circuit safety can be improved, and the circuit can be widely applied to the technical field of frequency shift keying communication.

Description

Technical Field

[0001] This utility model relates to the field of frequency shift keying communication technology, and in particular to a frequency shift keying communication circuit with adjustable output power and detectable load power. Background Technology

[0002] Frequency Shift Keying (FSK) communication is widely used in systems where field smart instruments, alarm controls, and other devices communicate with the main control unit due to its advantages such as simplicity, noise immunity, and low power consumption. When field smart instruments and alarm controls require power, they are typically powered by superimposing a 4-20mA current on the line (this method is also known as HART communication because it can transmit analog signals). However, traditional HART communication lines have the following drawbacks and limitations:

[0003] 1. When the power consumption of the remote slave device is high, the maximum operating current provided by the traditional transmitter line to the slave device is only 20mA, resulting in a low overall output power. This cannot meet the normal operation requirements of high-power loads, necessitating the deployment of a separate power supply at the remote end, increasing the environmental and cost requirements of the remote slave device. 2. When the power consumption of the remote slave device is high using traditional HART communication lines, the power supply is deployed at the remote end. When real-time power consumption of the remote device is needed to determine the load operation, it can only be transmitted to the master device via an FSK line. Therefore, the remote slave device also needs to add a load power consumption detection circuit, increasing circuit complexity and design costs. 3. Traditional HART communication lines have only one pair of wires. Although FSK digital signals and analog current signals have some anti-interference capability, when interference is strong, differential transmission using twisted-pair cables has stronger anti-interference capability compared to other methods. 4. Since power consumption increases or decreases due to short circuits or faults often occur instantaneously, the master control cannot immediately grasp the power supply status of the remote device, increasing safety risks. Utility Model Content

[0004] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a frequency shift keying communication circuit with adjustable output power and detectable load power, which can reduce design costs and improve circuit security.

[0005] The technical solution adopted by this utility model is:

[0006] A frequency shift keying communication circuit with adjustable output power and detectable load power includes a local driving unit and a remote slave unit. The local driving unit includes a local master control module, a local detection and voltage regulation module, and a local line transmission module. The remote slave unit includes a remote line transmission module. The local detection and voltage regulation module includes a Hall current sensor and a programmable resistor chip. The programmable resistor chip and the local line transmission module are both connected to the Hall current sensor. The Hall current sensor, the programmable resistor chip, and the local line transmission module are also all connected to the local master control module. The local line transmission module is connected to the remote line transmission module.

[0007] Furthermore, the local line transmission module includes a frequency shift keying (FSK) conversion circuit, which is connected to the local main control module.

[0008] Furthermore, the local line transmission module also includes a first transmission module, and the frequency shift keying conversion circuit, the Hall current sensor, and the remote line transmission module are all connected to the first transmission module.

[0009] Furthermore, the remote line transmission module includes a serial port conversion circuit, which is connected to the first transmission module.

[0010] Furthermore, the remote line transmission module includes a second transmission module, and both the first transmission module and the serial port conversion circuit are connected to the second transmission module.

[0011] Furthermore, the local detection module also includes a local voltage output circuit. The input terminal of the local voltage output circuit is connected to the output terminal of the local main control module, and the output terminal of the local voltage output circuit is connected to the input terminal of the Hall current sensor. The local voltage output circuit is also connected to the programmable resistor chip.

[0012] Furthermore, the remote slave device unit also includes a remote master control module, which is connected to the serial port conversion circuit.

[0013] Furthermore, the remote slave device unit also includes a remote voltage output circuit, the input terminal of which is connected to the output terminal of the second transmission module, and the input terminals of the remote master control module and the serial port conversion circuit are both connected to the output terminal of the remote voltage output circuit.

[0014] Furthermore, the first transmission module includes a first balun transformer and a third balun transformer. One end of the first balun transformer and the third balun transformer are both connected to the frequency shift keying conversion circuit, and the other end of the first balun transformer and the third balun transformer are connected to the second transmission module. The third balun transformer is also connected to the Hall current sensor.

[0015] Furthermore, the second transmission module includes a second balun transformer and a fourth balun transformer. One end of the second balun transformer is connected to the other end of the first balun transformer, and one end of the fourth balun transformer is connected to the other end of the third balun transformer. The other ends of both the second and fourth balun transformers are connected to the serial port conversion circuit.

[0016] The beneficial effects of this utility model are as follows: It includes a local drive unit and a remote slave unit. The local drive unit includes a local master control module, a local detection and voltage regulation module, and a local line transmission module. The remote slave unit includes a remote line transmission module. The local detection and voltage regulation module includes a Hall current sensor and a programmable resistor chip. The Hall current sensor is connected to the programmable resistor chip. The Hall current sensor, the programmable resistor chip, and the local line transmission module are all connected to the local master control module. The local line transmission module is connected to the remote line transmission module. The output voltage is regulated by the programmable resistor chip. The output voltage is transmitted to the remote slave unit through the Hall current sensor, the local line transmission module, and the remote line transmission module. The local slave unit receives the current signal from the local line transmission module and converts the current signal into a voltage signal. The local master control module receives the voltage signal and outputs the load power value. This utility model, on the one hand, accurately controls the output voltage through the programmable resistor chip, avoiding the problem of increased voltage drop caused by increased current, and realizing remote adjustment of output power; on the other hand, it uses the Hall current sensor to detect the current in the transmission line in real time, and then receives the current value through the local master control module to output the load power value of the transmission line, realizing real-time detection of load power. Attached Figure Description

[0017] Figure 1 A structural block diagram of a frequency shift keying communication circuit with adjustable output power and detectable load power provided by this utility model;

[0018] Figure 2 The present invention provides a circuit schematic diagram of a frequency shift keying communication circuit with adjustable output power and detectable load power.

[0019] Reference numerals: U1, First power supply chip; U2, Frequency shift keying conversion chip; U3, Local microcontroller; U4, Fourth power supply chip; U5, Hall current sensor; U6, Programmable resistor chip; U7, Serial port conversion chip; U8, Eighth power supply chip; U9, Remote microcontroller; R1, First resistor; R2, Second resistor; R4, Fourth resistor; R5, Fifth resistor; T1, First balun transformer; T2, Second balun transformer; T3, Third balun transformer; T4, Fourth balun transformer. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] Frequency Shift Keying (FSK) communication is widely used in systems where field smart instruments, alarm controls, and other devices communicate with the master control unit due to its advantages such as simplicity, noise immunity, and low power consumption. When field smart instruments and alarm controls require power, a 4-20mA current is typically superimposed on the line to provide power (this current can also transmit analog signals, hence the name HART communication). However, the master control unit's hardware interface for this method specifies a transmission current of no more than 20mA, thus limiting its application to low-power smart instruments and alarm controls. When field devices need to drive high-power loads such as audible and visual alarms and sirens, the operating current of these loads can reach hundreds of milliamps, necessitating a separate local power supply to meet their operational requirements. Traditional HART communication lines have the following disadvantages and deficiencies:

[0022] 1. When the power consumption of the remote slave device is high, the maximum operating current provided by the traditional transmitter line to the slave device is only 20mA, resulting in a low overall output power. This cannot meet the normal operation requirements of high-power loads, necessitating the deployment of a separate power supply at the remote end, increasing the environmental and cost requirements of the remote slave device. 2. When the power consumption of the remote slave device is high using traditional HART communication lines, the power supply is deployed at the remote end. When real-time power consumption of the remote device is needed to determine the load operation, it can only be transmitted to the master device via an FSK line. Therefore, the remote slave device also needs to add a load power consumption detection circuit, increasing circuit complexity and design costs. 3. Traditional HART communication lines have only one pair of wires. Although FSK digital signals and analog current signals have some anti-interference capability, when interference is strong, differential transmission using twisted-pair cables has stronger anti-interference capability compared to other methods. 4. Since power consumption increases or decreases due to short circuits or faults often occur instantaneously, the master control cannot immediately grasp the power supply status of the remote device, increasing safety risks.

[0023] To address this, this utility model proposes a frequency shift keying communication circuit with adjustable output power and detectable load power, comprising a local driving unit and a remote slave unit. The local driving unit includes a local master control module, a local detection and voltage regulation module, and a local line transmission module. The remote slave unit includes a remote line transmission module. The local detection and voltage regulation module includes a Hall current sensor and a programmable resistor chip. The Hall current sensor is connected to the programmable resistor chip. The Hall current sensor, the programmable resistor chip, and the local line transmission module are all connected to the local master control module. The local line transmission module is connected to the remote line transmission module. The output voltage is adjusted by the programmable resistor chip. The output voltage is transmitted to the remote slave unit through the Hall current sensor, the local line transmission module, and the remote line transmission module. The local slave unit receives the current signal from the local line transmission module and converts the current signal into a voltage signal. The local master control module receives the voltage signal and outputs the load power value. This invention, on the one hand, uses a programmable resistor chip to accurately control the output voltage, avoiding the problem of increased voltage drop caused by increased current, and realizing remote adjustment of output power; on the other hand, it uses a Hall current sensor to detect the current of the transmission line in real time, and then receives the current value through the local main control module and outputs the load power value of the transmission line, realizing real-time detection of load power.

[0024] Reference Figure 1 , Figure 1This is a structural block diagram of a frequency shift keying (FSK) communication circuit with adjustable output power and detectable load power. The FSD communication circuit includes a local driver unit and a remote slave unit. The local driver unit includes a local master control module, a local detection and voltage regulation module, and a local line transmission module. The remote slave unit includes a remote line transmission module. The local detection and voltage regulation module includes a Hall current sensor and a programmable resistor chip. The programmable resistor chip and the local line transmission module are both connected to the Hall current sensor. The Hall current sensor, the programmable resistor chip, and the local line transmission module are also all connected to the local master control module. The local line transmission module is connected to the remote line transmission module.

[0025] In some optional embodiments, this invention uses a Hall current sensor chip in the current detection section to transmit the current supplied to the remote slave device unit. Simultaneously, it can detect the magnitude of the DC current on the local line transmission module, obtaining a current signal. This acquired DC current signal is then converted into a voltage signal and transmitted to the analog-to-digital sampling port of the local master control module. The local master control module receives the voltage signal from the Hall current sensor and outputs the load power value of the transmission line, thereby determining whether the power consumption of the remote slave device unit is within the normal range. Further, the remote slave device unit sends its power consumption requirements to the local master control module via the remote line transmission module. The local master control module receives the power consumption requirements from the remote slave device unit, outputs the voltage value to be supplied to the remote slave device unit, and then controls the resistance value of the programmable resistor chip through its communication interface. This controls the local voltage output circuit in the local detection and voltage regulation module to change its output voltage, thereby changing the output voltage supplied to the remote slave device unit.

[0026] It should be noted that this utility model embodiment uses a Hall current sensor to detect changes in the operating current of the local line transmission module in real time. Combined with the real-time output voltage of the local voltage output circuit, it can accurately grasp the operation of the remote load without the need for communication with the remote slave device unit, thus reducing design costs and improving equipment efficiency. Furthermore, through the integrated design of the Hall current sensor, local line transmission module, remote line transmission module, and local main control module, it can detect changes in the power consumption of the remote slave device unit in real time, thereby enhancing the circuit's safety control capabilities.

[0027] Reference Figure 1 As an optional implementation, the local line transmission module includes a frequency shift keying (FSK) conversion circuit, which is connected to the local main control module.

[0028] Reference Figure 1As an optional implementation, the local line transmission module further includes a first transmission module, and the frequency shift keying conversion circuit, the Hall current sensor, and the remote line transmission module are all connected to the first transmission module.

[0029] Reference Figure 1 As an optional implementation, the remote line transmission module includes a serial port conversion circuit, which is connected to the first transmission module.

[0030] Reference Figure 1 As an optional implementation, the remote line transmission module includes a second transmission module, and the first transmission module and the serial port conversion circuit are both connected to the second transmission module.

[0031] Specifically, taking the local master control unit sending a signal to the remote unit as an example, the local master control module communicates with a frequency shift keying (FSK) conversion circuit via a serial port. The FSK conversion circuit converts the serial port signal into a FSK signal. The line between the FSK conversion circuit and the first transmission module is a single-ended transmission line, through which the FSK signal is transmitted to the first transmission module. Then, the first transmission module converts the single-ended FSK signal into a differential FSK signal. The line between the first and second transmission modules is a differential transmission line, through which the differential FSK signal is sent to the second transmission module in the remote slave unit. The second transmission module converts the differential FSK signal into a single-ended FSK signal. The line between the second transmission module and the serial port conversion circuit is a single-ended transmission line, through which the single-ended FSK signal is transmitted to the subsequent circuit.

[0032] Reference Figure 1 As an optional implementation, the remote slave unit also includes a remote master control module, which is connected to the serial port conversion circuit.

[0033] Specifically, the remote slave unit draws power from the neutral point of the transformer in the second transmission module, receives frequency shift keying signals from the local master control module through the transformer, converts the frequency shift keying signals into serial signals through a serial port conversion circuit, and finally transmits them to the remote master control module. The remote master control module controls the subsequent drive circuit to execute the control commands sent by the control terminal, and finally sends the execution status to the local master control module through the transformer, and realizes low-potential loop switching through the neutral point of the transmitting transformer.

[0034] It should be noted that this utility model embodiment supplies power to the remote slave device unit through a transmission cable, eliminating the need to build a power supply device on the remote slave device unit and reducing design costs.

[0035] Reference Figure 1As an optional implementation, the local detection module further includes a local voltage output circuit. The input terminal of the local voltage output circuit is connected to the output terminal of the local main control module, the output terminal of the local voltage output circuit is connected to the input terminal of the Hall current sensor, and the local voltage output circuit is also connected to a programmable resistor chip.

[0036] Specifically, the local voltage output circuit is used to output the corresponding output voltage to the Hall current sensor according to the power consumption data that the remote slave device unit needs to increase. The Hall current sensor then outputs the output voltage to the transmission line to increase the output power of the remote slave device unit.

[0037] Reference Figure 1 As an optional implementation, the remote slave unit further includes a remote voltage output circuit, the input of which is connected to the output of the second transmission module, and the inputs of the remote master control module and the serial port conversion circuit are both connected to the output of the remote voltage output circuit.

[0038] Reference Figure 2 , Figure 2 The circuit diagram shows a frequency shift keying communication circuit with adjustable output power and detectable load power. As an optional implementation, the first transmission module includes a first balun transformer and a third balun transformer. One end of the first balun transformer and the third balun transformer are connected to the frequency shift keying conversion circuit, and the other end of the first balun transformer and the third balun transformer are connected to the second transmission module. The third balun transformer is also connected to a Hall current sensor.

[0039] Reference Figure 2 As an optional implementation, the second transmission module includes a second balun transformer and a fourth balun transformer. One end of the second balun transformer is connected to the other end of the first balun transformer, and one end of the fourth balun transformer is connected to the other end of the third balun transformer. The other ends of both the second and fourth balun transformers are connected to a serial port conversion circuit.

[0040] It should be noted that this embodiment of the invention utilizes the characteristics of a balun transformer to transmit the remote power supply DC voltage and the frequency shift keying (FSK) AC communication line on the same twisted pair, saving on line costs and remote power supply equipment costs. Furthermore, while using the balun transformer to achieve single-ended to differential signal and differential to single-ended signal transmission, the strong anti-interference capability of differential signals increases the anti-interference capability of the FFS signal.

[0041] In summary, the basic circuit structure of the frequency shift keying communication circuit with adjustable output power and detectable load power of this utility model has been described. (Refer to...) Figure 2The following describes the working process of the frequency shift keying communication circuit of this utility model, which has adjustable output power and detectable load power.

[0042] The local main control module includes a local microcontroller U3, the frequency shift keying (FSK) conversion circuit includes a FPS conversion chip U2, the first transmission module includes a first balun transformer T1 and a third balun transformer T3, the local detection and voltage regulation module includes a Hall current sensor U5 and a programmable resistor chip U6, and the local voltage output circuit includes a first power supply chip U1 and a fourth power supply chip U4. The workflow of the local drive unit is as follows:

[0043] After the external DC power supply provides the working voltage to the VIN input terminal of the first power chip U1, the first power chip U1 outputs a preset working voltage to the frequency shift keying conversion chip U2, the local microcontroller U3, the Hall current sensor U5, and the programmable resistor chip U6 according to the preset values ​​of the first resistor R1 and the second resistor R2, so that they all enter the working state. Next, the local microcontroller U3 communicates with the programmable resistor chip U6 via the I2C interface, setting the A and W pins of the programmable resistor chip U6 to the preset value R0. The fourth power chip U4 outputs a preset voltage Ua through the preset values ​​of the fourth resistor R4 and the fifth resistor R5 (according to the output voltage of the fourth power chip U4: UO = Vref × (R1 / R2 + 1), it can be seen that under the condition that the input voltage meets the requirements, the output voltage is only related to the regulating resistor and is independent of the input voltage). The voltage Ua is applied to the neutral point pin of the third balun transformer T3 through the IP+ and IP- pins of the Hall current sensor U5. Finally, the local voltage is applied to the remote slave device unit through the twisted pair cable of the third balun transformer T3 and the fourth balun transformer T4, generating the operating current Ia. The programmable resistor chip U5 detects the value of the current Ia and converts it into an analog voltage, which is then transmitted to the AD sampling pin of the local microcontroller U3. The local microcontroller U3 can determine the magnitude of the current Ia in the transmission line using the current-to-voltage conversion formula of the programmable resistor chip U5.

[0044] Furthermore, the local microcontroller U3 sends a task command to the frequency shift keying conversion chip U2 through the serial interface. The frequency shift keying conversion chip U2 converts the serial port data into frequency shift keying format data, and then converts the single-ended signal into a differential signal through the third balun transformer T3 before sending it to the remote slave device unit. When the remote slave device receives a task command (such as an alarm initiation task), the remote microcontroller U9 outputs the increased power consumption required for the slave device to initiate the alarm task. This increased power consumption data is transmitted to the local microcontroller U3 via the second transmission module. Based on the power consumption data sent by the remote slave device, combined with the transmission line impedance and the voltage input range requirement (≤Umax) of the eighth power chip U8, the local microcontroller U3 outputs the voltage value Ub required by the fourth power chip U4. The local microcontroller U3 controls the programmable resistor chip U6 through the I2C interface to adjust the output resistance value to Rb. At this time, the voltage applied to the neutral point of the third balun transformer T3 becomes Ua+Ub (note that Ua+Ub≤Umax must be satisfied), thereby increasing the remote power supply voltage. This avoids the problem of insufficient power supply voltage caused by the increased line current due to the increased power consumption of the remote slave device, which would lead to excessive line voltage drop. Ultimately, this achieves the goal of increasing the output power of the remote slave device.

[0045] The remote master control module includes a remote microcontroller U9 (the subsequent driver circuit is not shown), a serial port conversion circuit includes a serial port conversion chip U7, a remote voltage output circuit includes an eighth power supply chip U8, and the second transmission module includes a second balun transformer T2 and a fourth balun transformer T4. The workflow of the remote slave device unit is as follows:

[0046] When a fault occurs in the downstream drive circuit (such as a short circuit) causing a sudden increase in the device current or a sudden decrease in the current (such as an open circuit), the Hall current detection chip U5 of the local master device power supply detects the current value and reports it to the local microcontroller U3. The local microcontroller U3 immediately reports the fault to the local monitoring center. At the same time, after determining that a fault has occurred in the remote slave device unit based on the current change, it immediately controls the programmable resistor chip U6 through the I2C interface to change its output resistance value, so that the output voltage of the fourth power chip U4 is reduced to the minimum, avoiding further danger to the remote slave device unit, thereby achieving the purpose of remote real-time monitoring of device power consumption changes.

[0047] The above description explains the structure and working principle of the frequency shift keying communication circuit with adjustable output power and detectable load power of this utility model. It can be understood that, compared with traditional HART communication lines, this utility model has the following advantages:

[0048] First, power is supplied to the remote slave device unit via transmission cable, eliminating the need to build power supply equipment on the remote slave device unit and reducing design costs;

[0049] Second, by using a balun transformer to convert single-ended frequency shift keying signals into differential frequency shift keying signals for transmission, the line's anti-interference capability is improved.

[0050] Third, by accurately controlling the output voltage of the local voltage output circuit through a programmable resistor chip and a local main control module, the problem of increased voltage drop caused by increased current can be avoided.

[0051] Fourth, by using a Hall current sensor to detect the current value of the transmission line in real time and receiving the current value of the transmission line through the local main control module, the power consumption changes of the remote device can be detected in real time, thereby enhancing the system's security control capabilities.

[0052] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0053] In this utility model, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0054] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0055] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A frequency shift keying communication circuit with adjustable output power and detectable load power, characterized by: The local drive unit comprises a local master module, a local detection and voltage regulation module and a local line transmission module, and the remote slave unit comprises a remote line transmission module, the local detection and voltage regulation module comprises a Hall current sensor and a programmable resistance chip, the programmable resistance chip and the local line transmission module are connected with the Hall current sensor, the Hall current sensor, the programmable resistance chip and the local line transmission module are also connected with the local master module, and the local line transmission module is connected with the remote line transmission module.

2. The frequency shift keying communication circuit with adjustable output power and detectable load power according to claim 1, characterized in that: The local line transmission module comprises a frequency shift keying conversion circuit connected with the local master module.

3. The frequency shift keying communication circuit with adjustable output power and detectable load power according to claim 2, characterized in that: The local line transmission module further comprises a first transmission module, and the frequency shift keying conversion circuit, the Hall current sensor and the remote line transmission module are connected with the first transmission module.

4. The frequency shift keying communication circuit with adjustable output power and detectable load power according to claim 3, characterized in that: The remote line transmission module comprises a serial port conversion circuit connected with the first transmission module.

5. The frequency shift keying communication circuit with adjustable output power and detectable load power according to claim 4, characterized in that: The remote line transmission module comprises a second transmission module, and the first transmission module and the serial port conversion circuit are connected with the second transmission module.

6. The frequency shift keying communication circuit with adjustable output power and detectable load power according to claim 1, characterized in that: The local detection and voltage regulation module further comprises a local voltage output circuit, an input end of the local voltage output circuit is connected with an output end of the local master module, an output end of the local voltage output circuit is connected with an input end of the Hall current sensor, and the local voltage output circuit is also connected with the programmable resistance chip.

7. The output power adjustable and load power detectable frequency shift keying communication circuit according to claim 5, characterized in that: The remote slave unit further comprises a remote master module connected with the serial port conversion circuit.

8. The output power adjustable and load power detectable frequency shift keying communication circuit according to claim 7, characterized in that: The remote slave unit further comprises a remote voltage output circuit, an input end of the remote voltage output circuit is connected with an output end of the second transmission module, and an output end of the remote voltage output circuit is connected with input ends of the remote master module and the serial port conversion circuit.

9. The output power adjustable and load power detectable frequency shift keying communication circuit according to claim 5, characterized in that: The first transmission module comprises a first balun transformer and a third balun transformer, one end of the first balun transformer and the third balun transformer is connected with the frequency shift keying conversion circuit, the other end of the first balun transformer and the third balun transformer is connected with the second transmission module, and the third balun transformer is also connected with the Hall current sensor.

10. The frequency shift keying communication circuit with adjustable output power and detectable load power according to claim 9, characterized in that: The second transmission module comprises a second balun transformer and a fourth balun transformer, one end of the second balun transformer is connected with the other end of the first balun transformer, one end of the fourth balun transformer is connected with the other end of the third balun transformer, and the other end of the second balun transformer and the fourth balun transformer is connected with the serial port conversion circuit.

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