Signal conversion circuit and conversion method for a communication system

Abstract

The application provides a signal conversion circuit and a conversion method of a communication system, wherein the signal conversion circuit comprises a differential conversion circuit, a shunt circuit, a hysteresis comparison circuit and a power reference circuit, wherein the differential conversion circuit is used for differentially converting a data signal received from a first external device and a data signal sent to an MVBC; the shunt circuit is used for shunting an output differential conversion signal of the differential conversion circuit to form a first path signal sent to the hysteresis comparison circuit and a second path signal sent to a second external device; the hysteresis comparison circuit is used for converting the first path signal shunted by the shunt circuit into a bit value of 0 or 1 and inputting the bit value into the differential conversion circuit; and the power reference circuit is used for providing a reference voltage to the hysteresis comparison circuit. The application can dynamically adjust the voltage waveform judgment standard of the circuit according to the change of the actual voltage waveform quality on site, and improves the applicability.

Description

Technical Field

[0001] This invention belongs to the field of information and communication technology, and particularly relates to a signal conversion circuit and conversion method for a communication system. Background Technology

[0002] In existing communication systems, data transmission between various electronic circuits needs to be accurate, timely, and conform to the requirements of communication protocols. Different communication protocols have different data requirements, leading to data transmission obstacles due to signal format issues when transmitting data between devices and networks using different protocols. Furthermore, with the continuous evolution of communication service demands, data needs to be transmitted between devices and networks using different protocols.

[0003] While some signal conversion circuits exist in the existing technology, their function is limited to data transmission between different devices, without considering the data transmission requirements between different communication protocols, especially the data transmission between the MVB (Multifunction Vehicle Bus) communication protocol and other communication protocols (such as RS232, RS485, and CAN bus).

[0004] Therefore, a signal conversion circuit is needed to enable data transmission between different protocols. Summary of the Invention

[0005] To address the aforementioned problems, this disclosure provides a signal conversion circuit and conversion method for a communication system.

[0006] This disclosure provides a signal conversion circuit for a communication system, the signal conversion circuit including a differential converter circuit, a splitter circuit, a hysteresis comparator circuit, and a power supply reference circuit, wherein...

[0007] The differential conversion circuit is used to perform differential conversion on the data signal received from the first external device and the data signal sent to the first external device;

[0008] The branching circuit is used to branch the output differential conversion signal of the differential conversion circuit to form a first signal sent to the hysteresis comparator circuit and a second signal sent to the second external device.

[0009] The hysteresis comparator circuit is used to convert the first signal from the splitter circuit into a bit value of 0 or 1 and input it into the differential converter circuit.

[0010] A power reference circuit is used to provide a reference voltage to the hysteresis comparator circuit.

[0011] In some embodiments, the signal conversion circuit further includes a first capacitor isolation circuit and a second capacitor isolation circuit electrically connected to the differential conversion circuit, wherein...

[0012] The first capacitor isolation circuit is used to electrically isolate the data signal received from the first external device and the data signal sent to the first external device by the differential conversion circuit;

[0013] The second capacitor isolation circuit is used to electrically isolate the enable signal received from the first external device and send it to the differential conversion circuit.

[0014] In some embodiments, the enable signal is used to control whether the differential conversion circuit performs differential conversion on the received data signal.

[0015] In some embodiments, the signal conversion circuit further includes an amplifier circuit electrically connected to the branch circuit, wherein,

[0016] The amplifier circuit is used to amplify the first signal output from the branch circuit.

[0017] In some embodiments, the amplifier circuit is a two-stage or higher amplifier circuit.

[0018] In some embodiments, a hysteresis comparator circuit is used to convert communication protocol data transmitted from an amplifier circuit into bit values.

[0019] In some embodiments, the power supply reference circuit is connected to the amplifier circuit and is capable of adjusting the magnitude of the reference voltage output to the hysteresis comparator circuit.

[0020] This disclosure also provides a signal conversion method for a communication system, the method comprising:

[0021] The differential conversion circuit performs differential conversion on the data signal received from the first external device and sends it to the splitter circuit;

[0022] The splitter circuit splits the data signal received from the first external device into a first signal and a second signal, sends the first signal to the hysteresis comparator circuit, and sends the second signal to the second external device.

[0023] The hysteresis comparator circuit converts the first signal output from the splitter circuit into a bit value of 0 or 1, and inputs it into the differential converter circuit.

[0024] In some embodiments, the differential conversion circuit further performs differential conversion on the data signal received from the hysteresis comparator circuit and sends it to the first external device.

[0025] In some embodiments, the differential conversion circuit performs differential conversion on the data based on an enable signal and sends it to the splitter circuit or the first external device.

[0026] In some embodiments,

[0027] The first capacitor isolation circuit isolates the data signal received from the first external device and then sends it to the differential conversion circuit; and / or,

[0028] The first capacitor isolation circuit electrically isolates the data signal sent by the differential conversion circuit to the first external device before sending it to the first external device.

[0029] In some embodiments,

[0030] The differential conversion circuit determines whether to perform differential conversion on the received signal based on an enable signal received from a first external device.

[0031] In some embodiments,

[0032] The first signal is amplified by the amplifier circuit and then sent to the hysteresis comparator circuit.

[0033] In some embodiments,

[0034] The first signal is amplified by the amplifier circuit and then sent to the hysteresis comparator circuit; and / or,

[0035] The second signal is sent to the second external device.

[0036] In some embodiments, the hysteresis comparator circuit converts the signal into a bit value of 0 or 1 based on a reference voltage provided by a power supply reference circuit, and inputs it into a differential conversion circuit.

[0037] Compared with the prior art, this disclosure has the following advantages:

[0038] The circuit employs a combination of a voltage reference circuit and a hysteresis comparator circuit, which can dynamically adjust the voltage waveform judgment criteria based on changes in the actual voltage waveform quality on site, thereby improving its applicability.

[0039] When choosing circuit chips, it is advisable to use domestically produced chips, which have independent production capabilities and can prevent chip supply disruptions caused by foreign embargoes on Chinese chips.

[0040] By using a capacitor isolation chip to separate the data processing MVB chip from the signal processing circuit, circuit safety is improved.

[0041] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 A schematic diagram of the hardware structure of a signal conversion circuit for a communication system according to an embodiment of the present disclosure is shown;

[0044] Figure 2 A schematic diagram of the hardware structure of a first isolation circuit in a signal conversion circuit according to an embodiment of the present disclosure is shown;

[0045] Figure 3 A schematic diagram of the hardware structure of a second isolation circuit in a signal conversion circuit according to an embodiment of the present disclosure is shown;

[0046] Figure 4 A schematic diagram of the hardware structure of a differential conversion circuit in a signal conversion circuit according to an embodiment of the present disclosure is shown.

[0047] Figure 5 A schematic diagram of the hardware structure of a branch circuit in a signal conversion circuit according to an embodiment of the present disclosure is shown;

[0048] Figure 6 A schematic diagram of the hardware structure of an amplifier circuit in a signal conversion circuit according to an embodiment of the present disclosure is shown.

[0049] Figure 7 A schematic diagram of the hardware structure of a power supply reference circuit in a signal conversion circuit according to an embodiment of the present disclosure is shown.

[0050] Figure 8 A schematic diagram of the hardware structure of a hysteresis comparator circuit in a signal conversion circuit according to an embodiment of the present disclosure is shown.

[0051] Figure 9 A schematic flowchart of a signal conversion method for a communication system according to an embodiment of the present disclosure is shown. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] like Figure 1 A schematic diagram of the hardware structure of a signal conversion circuit of a communication system according to an embodiment of the present disclosure is shown, such as... Figure 1 As shown, the signal conversion circuit enables signal conversion between different devices. In this embodiment, an MVBC (Multi-Function Vehicle Bus Chip) is used as the first external device, and an external MVB device is used as the second external device for illustrative purposes. The signal conversion between the MVBC chip and other MVBC devices is illustrated by the signal conversion circuit, which includes capacitor isolation circuits U15 and U17, a differential converter circuit U16, a splitter U288, amplifier circuits U42 and U329, a hysteresis comparator circuit U283, and a power reference circuit U287, all electrically connected in sequence. Specifically, the two capacitor isolation circuits electrically connected to the differential converter circuit are capacitor isolation circuit-1 U15 and capacitor isolation circuit-2 U17; the amplifier circuit electrically connected to the splitter includes a first-stage amplifier circuit U329 and a second-stage amplifier circuit U42. It should be noted that in this disclosure, electrical connection does not necessarily mean a connection between two devices via a wire; connections achieved through other electronic devices and connections via infrared, photoelectric, etc., are also included.

[0054] In this embodiment, the differential conversion circuit receives a data signal N_MVBC_OCA_IF from the MVBC (MVB Chip) chip or circuit via capacitor isolation circuit -1U15 and an enable signal N_MVBC_SF_IF from the MVBC chip or circuit via capacitor isolation circuit -2U17. It then performs differential conversion on the data signal received from the MVBC and sends it to the splitter circuit. Furthermore, it can perform differential conversion on the data signal N_MVBC_ICA_IF sent from the hysteresis comparator circuit to form a data signal N_MVBC_ICA_IF to be sent to the MVBC chip or circuit, which is then sent to the MVBC chip or circuit via capacitor isolation circuit -1. The capacitor isolation circuit -2U17 receives the enable signal N_MVBC_SF_IF from the MVBC chip or circuit and determines whether a differential conversion signal needs to be sent to the splitter based on this enable signal, i.e., it starts or stops operation based on this enable signal. The differential conversion signal MVB_N_A_P_C, processed by the differential conversion circuit, is then sent to the splitter circuit. In this embodiment of the disclosure, the enable signal N_MVBC_SF_IF is used to control whether the differential conversion circuit outputs a signal to the next stage (e.g., a splitter circuit). This effectively realizes the MVBC to control whether the differential conversion circuit starts working, that is, to control whether the differential conversion circuit performs differential conversion on the received data signal.

[0055] The splitter circuit is used to split the output signal of the differential converter circuit. One signal after splitting is amplified by a two-stage amplifier and input to the hysteresis comparator circuit, while the other signal is sent to an external MVB device. The hysteresis comparator circuit converts the split output signal into a 0 or 1 digital signal and inputs it to the differential converter circuit. After differential conversion, the signal is sent to the MVBC chip or circuit through a capacitor isolation circuit -1. In this embodiment, the transformer of the splitter adopts a 1:1:1 structure. This splitter does not adjust the voltage amplitude but divides the signal into three paths.

[0056] Figure 2 A schematic diagram of the hardware structure of a first isolation circuit in a signal conversion circuit according to an embodiment of the present disclosure is shown. In this embodiment, the isolation circuit can employ an existing capacitor isolation chip. Figure 2As shown, the power supply terminal VDD1 of isolation side 1 of the isolation circuit is connected to a 3.3V voltage and is connected to ground through a capacitor; the power supply terminal VDD2 of isolation side 2 is connected to a 5V voltage and is connected to ground through a capacitor; the ground terminals GND1 of isolation side 1 and GND2 of isolation side 2 are both connected to ground; the logic input terminal A, I NA, is connected to the data signal output line N_MVBC_OC_IF of the MVBC and is used to receive the data signal N_MVBC_OC_IF sent by the MVBC. The isolated data signal N_MVBC_OCA_IF_IFSO is output to the differential conversion circuit through the logic output terminal OUTA; the logic input terminal B, I NB, is used to receive the data signal N_MVBC_ICA_IF_IFSO sent by the differential circuit. The data signal N_MVBC_ICA_IF after isolation by the isolation circuit is sent to the MVBC chip or circuit through the logic output terminal B. In this embodiment of the disclosure, the bidirectional data isolation transmission function of the isolation device is utilized to isolate the data signal of the MVBC and send it to the differential conversion circuit, and to isolate the data signal sent from the differential conversion circuit and send it to the MVBC chip or circuit.

[0057] Figure 3 A schematic diagram of the hardware structure of a second isolation circuit in a signal conversion circuit according to an embodiment of the present disclosure is shown. Figure 3 As shown, the second isolation circuit is used to isolate the enable signal sent by the MVBC and output it to the differential conversion circuit. In this embodiment, the electrical connection of the second isolation circuit is basically similar to that of the first circuit. Its logic input A terminal INA is connected to the enable signal N_MVBC_SF_IF of the MVBC. Upon receiving the enable signal N_MVBC_SF_IF, it isolates it. The isolated enable signal N_MVBC_SFA_IF_ISO is output to the differential conversion circuit through the logic output A terminal OUTA, which is used to control whether the differential conversion circuit outputs relevant signals to the next stage (e.g., a branch circuit). The logic output B terminal OUTB and the logic input B terminal INB are both floating, i.e., not connected to other electronic devices.

[0058] The isolation circuit used in this embodiment improves the signal's anti-interference capability and protects external chips, such as MVBC chip pins, from damage caused by external voltage surges.

[0059] In this embodiment of the disclosure, a differential conversion circuit is formed by designing the peripheral circuit of an existing differential conversion chip. Figure 4 A schematic diagram of the hardware structure of a differential conversion circuit in a signal conversion circuit according to an embodiment of the present disclosure is shown. Figure 4The exemplary driver input terminal DI receives the data signal N_MVBC_OCA_IF_ISO, the driver output enable control terminal DE receives the enable signal N_MVBC_SFA_IF_ISO, and the receiver output terminal RO outputs the data signal N_MVBC_ICA_IF_ISO to the first capacitor isolation circuit. The receiver output enable control terminal nRE is connected to the two ground terminals GND through a resistor and grounded. The receiver non-inverting input terminal A is grounded through a resistor R374, and the receiver inverting input terminal B is connected to a resistor R375. The hysteresis comparison signal of the hysteresis comparator circuit is received at the FF terminal of the resistor R375. The receiver non-inverting input terminal A is connected to the driver non-inverting output terminal Y through a resistor R341 to form a connection point AA, which is connected to the shunt circuit. The receiver inverting input terminal B is connected to the driver inverting output terminal Z through a resistor R342 to form a connection point BB, which is also connected to the shunt circuit. In this embodiment, resistors R374 and R375 are set as 0-ohm resistors, i.e. wires. The purpose of adding 0-ohm resistors in this embodiment is to allow the electrical signal on the 0-ohm resistor to be directly measured with an oscilloscope when problems occur in actual field applications, which facilitates on-site debugging.

[0060] In this embodiment of the disclosure, the branch circuit can be formed by using an existing branch circuit chip and designing the peripheral circuit of the branch circuit chip. Figure 5 A schematic diagram of the hardware structure of a branch circuit in a signal conversion circuit according to an embodiment of the present disclosure is shown. Figure 5 As shown, in the differential converter circuit described above, terminal AA is connected to terminal 3 of the shunt chip, and terminal BB is connected to terminal 8 of the shunt chip. The output signal terminal 5, after being transformed by the shunt chip, is connected to resistor R331 via a fuse F4 to form the CC terminal. The second signal output terminal 6 is connected to two series resistors R331 and R332 to form the DD terminal. Terminal 4 of the shunt is grounded via resistor R322. The shunt data signals MVB_N_A_P from terminals 1 and 10 are sent to or received from an external MVB device. In this embodiment, fuse F4 is provided at the output signal terminal, which can promptly melt and protect the internal circuit components after an abnormal current is injected into the external circuit.

[0061] As shown above, the shunting circuit in this embodiment uses an existing transformer chip to achieve the shunting function. The transformer is not used to adjust the voltage amplitude of the signal, but rather to shun the signal; therefore, a 1:1:1 transformer structure is adopted. Figure 5As shown, the first path between pins 1 and 10 of the first coil of the transformer is used to transmit data signals with an external MVB device; the second path between pins 3 and 8 of the second coil of the transformer is used to receive the output signal of the differential converter circuit, with pin 3 connected to the AA terminal of the differential converter circuit and pin 8 connected to the BB terminal of the differential converter circuit; the third path formed between pins 4, 5, and 6 of the third coil of the transformer is used to send data signals to the amplifier circuit, with pin 5 connected to the CC terminal of the amplifier circuit and pin 6 connected to the DD terminal of the amplifier circuit.

[0062] In this embodiment, the amplifier can be an existing basic operational amplifier chip, and the amplifier circuit is formed by designing the peripheral circuit of the amplifier chip. This embodiment also considers the amplification capability of the amplifier chip and the signal recognition requirements of the subsequent hysteresis comparator circuit, and sets up a two-stage amplifier to improve the quality of the voltage waveform and effectively reduce the bit error rate in the conversion circuit. Figure 6 A schematic diagram of the hardware structure of an amplifier circuit in a signal conversion circuit according to an embodiment of the present disclosure is shown. Figure 6 As shown, the positive input terminal (+IN) of the first-stage amplifier is connected to the CC terminal of the shunt circuit; the negative input terminal (-IN) of the first-stage amplifier is connected to the DD terminal of the shunt circuit, and then connected to the output terminal (OUT) through resistor R326; the output terminal (OUT) of the first-stage amplifier is connected to the positive input terminal (+IN) of the second-stage amplifier through resistor R409; the negative input terminal (-IN) of the second-stage amplifier is grounded through resistor R410, and then connected to the output terminal (OUT) through resistor R411; the output terminal (OUT) of the second-stage amplifier is connected to resistor 401 to form the output port EE. With this amplifier circuit configuration, in the design of the signal conversion circuit, domestically produced chips can be selected, thus possessing independent production capabilities and preventing chip supply disruptions caused by foreign embargoes on Chinese chips.

[0063] The power reference circuit can be designed using existing operational amplifier chips with hysteresis comparator function. In this embodiment, a power reference circuit is formed by designing the peripheral circuit of the operational amplifier chip. Figure 7 A schematic diagram of the hardware structure of a power supply reference circuit in a signal conversion circuit according to an embodiment of the present disclosure is shown. Figure 7As shown, in the power reference circuit, the positive input A terminal +INA of the operational amplifier chip is connected to a 2.5V level through resistor R380, and connected to the EE interface in the amplifier circuit through resistor R379; the negative input A terminal -INA is grounded through resistors R383 and R384 connected in series; the output A terminal OUTA is connected between resistors R383 and R384 connected in series, and provides a reference voltage (sig_ampl_adj_a) to the hysteresis comparator circuit; the positive input B terminal +INB is connected to a 5V level through resistor R387, and grounded through resistor R388; the negative input B terminal -INB and the output B terminal OUTB are both connected to a 2.5V level; the high-level terminal +Vs is connected to a 5V power supply; the low-level terminal -Vs is grounded and connected to resistor R388. In this embodiment, different magnitudes of reference voltage can be output to the differential conversion circuit by conveniently adjusting the resistance ratio of resistors R383 and R384.

[0064] Hysteresis comparator circuits can be designed using existing operational amplifier chips. In this embodiment, a hysteresis comparator circuit is formed by designing the peripheral circuit of the operational amplifier chip. Figure 8 A schematic diagram of the hardware structure of a hysteresis comparator circuit in a signal conversion circuit according to an embodiment of the present disclosure is shown. Figure 8 As shown, the negative input A terminal -INA is connected to port EE of the aforementioned secondary amplifier circuit via resistor R327, and is connected to the reference voltage sig_ampl_adj_a provided by the voltage reference circuit via resistor R389; the positive input A terminal +INA is connected to resistor R333, and is grounded via resistor R333; the output A terminal OUTA is grounded via resistors R334 and R333 connected in series, and is connected to resistor R335 (via... Figure 8 The hysteresis comparator (OPA698_A_OUT) outputs a hysteresis comparator signal to the differential conversion circuit (FF terminal in the figure); the high-level terminal +Vs is connected to a 5V power supply, and the low-level terminal -Vs is connected to a -5V power supply. In this embodiment of the present disclosure, through the design of this hysteresis comparator circuit, the data in the MVB protocol data frames (e.g., master frames, slave frames, etc.) received from the amplifier circuit are converted into bit values ​​of "0" and "1".

[0065] Based on the signal conversion circuit of the above-mentioned communication system, this disclosure also provides a signal conversion method. Figure 9 A schematic flowchart of a signal conversion method for a communication system according to an embodiment of the present disclosure is shown, such as... Figure 9As shown, the signal conversion method includes: the differential conversion circuit performs differential conversion on the data signal received from the MVBC based on the aforementioned enable signal and sends it to the splitter circuit; and performs differential conversion on the data signal received from the hysteresis comparator circuit and sends it to the MVBC; the splitter circuit splits the data signal received from the MVBC into a first signal and a second signal, sends the first signal to the hysteresis comparator circuit, and sends the second signal to an external MVB device; the hysteresis comparator circuit converts the first signal split by the splitter circuit into a bit value of 0 or 1 and inputs it into the differential conversion circuit.

[0066] In the signal conversion, the capacitor isolation circuit-1 isolates the data signal received from the MVBC before sending it to the differential conversion circuit. The data signal sent from the differential conversion circuit to the MVBC is then electrically isolated before being sent to the MVBC. The hysteresis comparator circuit converts the signal into a 0 or 1 bit value based on the reference voltage provided by the power supply reference circuit and inputs it to the differential conversion circuit.

[0067] This embodiment employs a combination of a voltage reference circuit and a hysteresis comparator circuit. This allows for dynamic adjustment of the circuit's voltage waveform judgment criteria by adjusting the magnitude of the reference voltage based on changes in the actual voltage waveform quality on-site, thereby improving applicability.

[0068] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A signal conversion circuit for a communication system, the signal conversion circuit comprising a differential converter circuit (U16), a splitter circuit (U288), a hysteresis comparator circuit (U283), and a power supply reference circuit (U287), wherein, The differential conversion circuit is used to perform differential conversion on the data signal received from the first external device and the data signal sent to the first external device, and to perform differential conversion on the data signal received from the hysteresis comparator circuit and send it to the first external device. The first external device is an MVBC chip; The branching circuit is used to branch the output differential conversion signal of the differential conversion circuit to form a first signal sent to the hysteresis comparator circuit and a second signal sent to the second external device. The hysteresis comparator circuit is used to convert the first signal from the splitter circuit into a bit value of 0 or 1 based on the reference voltage and input it into the differential converter circuit. A power reference circuit (U287) is used to provide a reference voltage to the hysteresis comparator circuit; The first signal is coupled to one end of a resistor, and the other end of the resistor is connected to the non-inverting input of an operational amplifier chip in a power supply reference circuit. The output of the operational amplifier chip outputs a reference voltage, and the power supply reference circuit can adjust the magnitude of the reference voltage output to the hysteresis comparator circuit.

2. The signal conversion circuit according to claim 1, further comprising a first capacitor isolation circuit and a second capacitor isolation circuit electrically connected to the differential conversion circuit, wherein, The first capacitor isolation circuit is used to electrically isolate the data signal received from the first external device and the data signal sent to the first external device by the differential conversion circuit; The second capacitor isolation circuit is used to electrically isolate the enable signal received from the first external device and send it to the differential conversion circuit.

3. The signal conversion circuit according to claim 2, wherein, The enable signal is used to control whether the differential conversion circuit performs differential conversion on the received data signal.

4. The signal conversion circuit according to claim 1, further comprising an amplifier circuit connected to the branch circuit, wherein, The amplifier circuit is used to amplify the first signal output from the branch circuit.

5. The signal conversion circuit according to claim 4, wherein the amplifier circuit is a two-stage or higher amplifier circuit.

6. The signal conversion circuit according to any one of claims 1-5, wherein, Hysteresis comparator circuit is used to convert communication protocol data sent from amplifier circuit into bit values.

7. A signal conversion method for a communication system, the method comprising: The differential conversion circuit performs differential conversion on the data signal received from the first external device and sends it to the splitter circuit, and performs differential conversion on the data signal received from the hysteresis comparator circuit and sends it to the first external device. The first external device is an MVBC chip; The splitter circuit splits the data signal received from the first external device into a first signal and a second signal, sends the first signal to the hysteresis comparator circuit, and sends the second signal to the second external device. The hysteresis comparator circuit converts the first signal from the branch circuit into a bit value of 0 or 1 based on the reference voltage provided by the power supply reference circuit, and inputs it into the differential conversion circuit. The first signal is coupled to one end of a resistor, and the other end of the resistor is connected to the non-inverting input of an operational amplifier chip in a power supply reference circuit. The output of the operational amplifier chip outputs a reference voltage, and the power supply reference circuit can adjust the magnitude of the reference voltage output to the hysteresis comparator circuit.

8. The signal conversion method according to claim 7, wherein, The differential conversion circuit also performs differential conversion on the data signal received from the hysteresis comparator circuit and sends it to the first external device.

9. The signal conversion method according to claim 7 or 8, wherein, The differential conversion circuit performs differential conversion on the data based on an enable signal and sends it to the split circuit or the first external device.

10. The signal conversion method according to claim 7, wherein, The first capacitor isolation circuit isolates the data signal received from the first external device and then sends it to the differential conversion circuit; and / or, The first capacitor isolation circuit electrically isolates the data signal sent by the differential conversion circuit to the first external device before sending it to the first external device.

11. The signal conversion method according to claim 7, wherein, The differential conversion circuit determines whether to perform differential conversion on the received signal based on an enable signal received from a first external device.

12. The signal conversion method according to claim 7, wherein, The first signal is amplified by the amplifier circuit and then sent to the hysteresis comparator circuit.

13. The signal conversion method according to any one of claims 7 or 10-12, wherein, The first signal is amplified by the amplifier circuit and then sent to the hysteresis comparator circuit; and / or, The second signal is sent to the second external device.

Images