CN112039550A - Communication device and receiving unit and transmitting unit thereof - Google Patents
Communication device and receiving unit and transmitting unit thereof Download PDFInfo
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- CN112039550A CN112039550A CN201910515724.2A CN201910515724A CN112039550A CN 112039550 A CN112039550 A CN 112039550A CN 201910515724 A CN201910515724 A CN 201910515724A CN 112039550 A CN112039550 A CN 112039550A
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- 239000003990 capacitor Substances 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 230000007175 bidirectional communication Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B14/00—Transmission systems not characterised by the medium used for transmission
- H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
- H04B14/026—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse time characteristics modulation, e.g. width, position, interval
Abstract
The disclosure provides a communication device and a receiving unit and a sending unit thereof. The receiving unit generates a communication instruction after voltage reduction according to a first communication instruction from another communication device, generates a pulse width modulation signal according to the communication instruction after voltage reduction, and decodes the pulse width modulation signal to generate a decoded signal. The transmitting unit includes an operational amplifier and a switch circuit. The operational amplifier generates a conducting signal according to a voltage signal. The operational amplifier comprises a positive input terminal, a negative input terminal and an output terminal coupled to the negative input terminal. The switch circuit is coupled between the negative input end and the output end of the operational amplifier, is conducted according to the conducting signal and generates a current signal as a second communication instruction to be output to another communication device according to the voltage signal when the switch circuit is conducted.
Description
Technical Field
The present invention relates to a communication device, and in particular to a communication device suitable for fire protection systems.
Background
Conventionally, a communication device often uses a capacitor to convert a voltage to decode a communication command received by the communication device, however, the voltage conversion by the capacitor is prone to cause instability of the converted voltage, resulting in a problem of communication failure due to decoding error. Furthermore, the communication device generally has only a signal transmitting/receiving function but no other functions, and the communication device has a single function, which makes it difficult to support different product applications. Further, the conventional communication apparatus often uses a large number of components, resulting in a complicated structure, and when the communication apparatus malfunctions, it is difficult for a maintenance person to detect the cause of the malfunction.
Disclosure of Invention
The invention provides a communication device, which comprises a receiving unit and a transmitting unit. The receiving unit is used for receiving a first communication instruction from another communication device, generating a first communication instruction after voltage reduction, generating a pulse width modulation signal according to the first communication instruction after voltage reduction, and decoding the pulse width modulation signal according to the pulse width of the pulse width modulation signal at a high level and the pulse width of the pulse width modulation signal at a low level to generate a decoding signal. The transmitting unit includes an operational amplifier and a switch circuit. The operational amplifier is used for generating a conducting signal according to the voltage signal. The operational amplifier comprises a positive input terminal, a negative input terminal and an output terminal coupled to the negative input terminal. The positive input end receives the voltage signal, and the output end outputs the conducting signal. The switch circuit is coupled between the negative input end and the output end of the operational amplifier, is conducted according to the conducting signal and generates a current signal as a second communication instruction to be output to another communication device according to the voltage signal when the switch circuit is conducted.
The invention provides a receiving unit, which comprises a voltage division circuit, a digital-analog converter, a comparison circuit and a calculation circuit. The voltage division circuit is used for receiving a communication instruction from the communication device and performing voltage division conversion on the communication instruction to generate a communication instruction after voltage reduction. The digital-to-analog converter is used for generating a reference voltage according to a digital signal. The comparison circuit is used for comparing the reference voltage with the communication command after voltage reduction to generate a pulse width modulation signal. The calculating circuit is used for calculating the pulse width of the pulse width modulation signal at a high level and the pulse width of the pulse width modulation signal at a low level to generate a decoding signal.
The invention provides a transmitting unit, which comprises a digital-analog converter, an operational amplifier and a switch circuit. The digital-to-analog converter is used for generating a voltage signal according to a digital signal. The operational amplifier is used for generating a conducting signal according to the voltage signal. The operational amplifier includes a positive input terminal, a negative input terminal and an output terminal. The positive input end receives the voltage signal, the output end is coupled with the negative input end, and the output end outputs the conducting signal. The switch circuit is coupled between the negative input end and the output end to form a negative feedback circuit, is conducted according to the conducting signal and generates a current signal as a communication instruction to be output to the communication device according to the voltage signal when the switch circuit is conducted.
Drawings
Fig. 1 is a block schematic diagram of an embodiment of a communication device according to the present disclosure.
Fig. 2 is a circuit diagram of an embodiment of the two communication devices of fig. 1.
Fig. 3 is a schematic diagram illustrating a signal flow direction of the communication device of fig. 1 when operating in the second operation mode.
Fig. 4 is a block diagram of an embodiment of a transmitting unit of the communication device of fig. 1.
Fig. 5 is a schematic diagram of an embodiment of the two communication devices of fig. 1 applied to a fire fighting system.
Description of reference numerals:
1 communication device
11 receiving unit
111 voltage dividing circuit
C connection point
R1 first resistor
R2 second resistor
112 first digital-to-analog converter
113 comparison circuit
114 calculation circuit
12 transmitting unit
121 operational amplifier
1211 positive input terminal
1212 negative input terminal
1213 output terminal
122 switching circuit
G grid terminal
D drain terminal
S source terminal
123 second digital-to-analog converter
124 first multiplexer
125 second multiplexer
126 switch
127 load
128 analog-to-digital converter
13 input/output circuit
15 controller
2 communication device
3 power supply circuit
4 ground circuit
C connection point
C1 control signal
C2 control signal
C3 control signal
D1 first digital signal
D2 second digital signal
V1 Voltage Signal
Reference voltage of V2
S1 first communication instruction
S2 second communication instruction
S3 PWM Signal
S4 decoding signal
S5 turn-on signal
Detailed Description
Fig. 1 is a block diagram of a communication device 1 according to an embodiment of the present disclosure, please refer to fig. 1. The communication apparatus 1 can bidirectionally communicate with another communication apparatus 2. The communication apparatus 1 can receive a communication command S1 (hereinafter referred to as a first communication command S1 for convenience of description) from the communication apparatus 2 and decode the first communication command S1 (hereinafter referred to as a command receiving program), and the communication apparatus 1 can generate another communication command (hereinafter referred to as a second communication command S2) and transmit it to the communication apparatus 2 (hereinafter referred to as a command transmitting program) to establish bidirectional communication between the communication apparatus 1 and the communication apparatus 2. In one embodiment, the first communication command S1 is a voltage modulation signal.
Taking the example that the communication device 1 includes a set of receiving unit 11 and transmitting unit 12, as shown in fig. 1, the communication device 1 includes a receiving unit 11, a transmitting unit 12, and an input/output line 13. In the command receiving program, the input/output circuit 13 receives the first communication command S1 from the communication device 2, the input/output circuit 13 transmits the first communication command S1 to the receiving unit 11, the receiving unit 11 performs a step-down process on the first communication command S1 to generate a first communication command S1 after step-down, the receiving unit 11 then generates a Pulse Width Modulation (PWM) signal S3 according to the first communication command S1 after step-down, the receiving unit 11 calculates a pulse width of the PWM signal S3 at a high level (hereinafter referred to as a first width) and a pulse width of the PWM signal S3 at a low level (hereinafter referred to as a second width), and the receiving unit 11 decodes the PWM signal S3 according to the first width and the second width to generate a decoding signal S4. For example, taking the case where the pulse width at the high bit is twice the pulse width at the low bit to represent a logic "1" and the pulse width at the low bit is twice the pulse width at the high bit to represent a logic "0", when the receiving unit 11 calculates the aforementioned first width to be twice the second width, the receiving unit 11 generates the decoded signal S4 including a logic "1", and when the receiving unit 11 calculates the second width to be twice the first width, the receiving unit 11 generates the decoded signal S4 including a logic "0".
On the other hand, in the instruction transmission program, the transmission unit 12 generates the second communication instruction S2 and transmits the second communication instruction S2 to the communication device 2. The transmission unit 12 includes an operational amplifier 121 and a switch circuit 122. The operational amplifier 121 includes a positive input 1211, a negative input 1212, and an output 1213. The positive input 1211 receives a voltage signal V1, the voltage signal V1 includes different voltage levels switched between a high level and a low level; the negative input terminal 1212 is coupled to the output terminal 1213 via the switch circuit 122 (i.e., the switch circuit 122 is coupled between the negative input terminal 1212 and the output terminal 1213) such that the operational amplifier 121 has a negative feedback (feed-back) circuit.
Herein, the operational amplifier 121 generates the turn-on signal S5 when the voltage signal V1 received by the positive input 1211 is at a high level, and the switch circuit 122 receives the turn-on signal S5 and turns on according to the turn-on signal S5; in addition, according to the negative feedback line of the operational amplifier 121, the negative input terminal 1212 of the operational amplifier 121 generates the voltage level of the voltage signal V1 according to the voltage signal received by the positive input terminal 1211, the switch circuit 122 receives the voltage level of the voltage signal V1 generated by the negative input terminal 1212, the switch circuit 122 generates the current signal according to the voltage level of the voltage signal V1 when turned on, and the current signal serves as the second communication command S2 to output the second communication command S2 to the communication device 2 through the input/output line 13 of the communication device 1. Accordingly, the switch circuit 122 generates a current signal according to the voltage signal with a stable and accurate voltage level from the operational amplifier 121, and the current signal generated by the switch circuit 122 is also stable and accurate, so as to improve the communication quality between the communication device 1 and the communication device 2.
In an embodiment, as shown in fig. 1, the sending unit 12 further includes a load 127 coupled between the switch circuit 122 and the ground, the load 127 may be a resistor with a fixed resistance value, the switch circuit 122 generates the second communication command S2 as a constant current signal according to the voltage level of the voltage signal V1 and the load 127, the current level of the constant current signal is stable, and the communication quality between the communication device 1 and the communication device 2 is further improved.
As shown in fig. 1, the receiving unit 11 includes a voltage dividing circuit 111, a digital-to-analog converter 112 (hereinafter, referred to as a first digital-to-analog converter 112), a comparing circuit 113, and a calculating circuit 114. The voltage divider 111 is coupled between the input/output line 13 and the comparator 113. The comparison circuit 113 is coupled between the voltage divider circuit 111 and the calculation circuit 114, and the comparison circuit 113 is coupled between the first digital-to-analog converter 112 and the calculation circuit 114. In one embodiment, the first communication command S1 has a voltage level of 30-40V, the voltage divider 111 receives the first communication command S1 from the i/o line 13 and performs voltage division conversion on the first communication command S1 to generate a reduced voltage first communication command S1, and the reduced voltage first communication command S1 may have a voltage level of 6V or 3.3V. The first digital-to-analog converter 112 generates a reference voltage V2 according to a digital signal (hereinafter referred to as a first digital signal D1). Two input terminals of the comparing circuit 113 are coupled to the voltage dividing circuit 111 and the output terminal of the first digital-to-analog converter 112, respectively, the comparing circuit 113 receives the first communication command S1 after voltage reduction from the voltage dividing circuit 111 and receives the reference voltage V2 from the first digital-to-analog converter 112, the comparing circuit 113 compares the reference voltage V2 with the first communication command S1 after voltage reduction, when the voltage level of the stepped-down first communication command S1 is greater than the reference voltage V2, the comparison circuit 113 outputs a high level, when the voltage level of the first communication command S1 after voltage reduction is less than the reference voltage V2, the comparison circuit 113 outputs a low level, so the comparison circuit 113 generates the PWM signal S3 according to the first communication command S1 after voltage reduction and the reference voltage V2, the calculation circuit 114 receives the PWM signal S3 from the comparison circuit 113, and the calculation circuit 114 calculates the first width and the second width of the PWM signal S3 to decode the PWM signal S3 to generate the decoded signal S4.
In one embodiment, the first communication command S1 is a multi-segment voltage signal. The receiving unit 11 may include a plurality of first dacs 112, a plurality of comparing circuits 113 and a plurality of calculating circuits 114, wherein the plurality of first dacs 112 respectively generate different reference voltages V2, the plurality of comparing circuits 113 respectively compare the first communication command S1 after voltage reduction with different reference voltages V2 at different time points, so that the plurality of calculating circuits 114 generate a plurality of decoding signals S4 corresponding to the first communication command S1 of the plurality of voltage signals.
In an embodiment, referring to fig. 1 and fig. 2, the voltage divider circuit 111 includes two resistors R1 and R2 (hereinafter referred to as a first resistor R1 and a second resistor R2) connected in series, the first resistor R1 is coupled to the input/output line 13 of the communication device 1 and the second resistor R2, the second resistor R2 is coupled to the first resistor R1 and the ground, and a resistance of the second resistor R2 is greater than a resistance of the first resistor R1. Then, according to the resistance values of the first resistor R1 and the second resistor R2, the voltage divider circuit 111 performs voltage division conversion on the first communication command S1 to generate a first communication command S1 after voltage reduction, one input terminal of the comparator circuit 113 is coupled to the connection point C between the first resistor R1 and the second resistor R2, and the comparator circuit 113 generates the PWM signal S3 according to the first communication command S1 after voltage reduction and the reference voltage V2 received from the connection point C.
In an embodiment, referring to fig. 1 and fig. 2 together, the sending unit 12 includes a digital-to-analog converter 123 (hereinafter referred to as a second digital-to-analog converter 123), an output end of the second digital-to-analog converter 123 is coupled to the positive input end 1211 of the operational amplifier 121, the second digital-to-analog converter 123 generates a voltage signal V1 according to a digital signal (hereinafter referred to as a second digital signal D2), the second digital-to-analog converter 123 sends the voltage signal V1 to the positive input end 1211 of the operational amplifier 121, so that the operational amplifier 121 generates the turn-on signal S5 according to the voltage signal, and the negative input end 1212 of the operational amplifier 121 generates the voltage level of the voltage signal V1.
Further, as shown in fig. 2, the switch circuit 122 includes a Transistor, such as a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), and the switch circuit 122 includes a gate terminal G, a source terminal S, and a drain terminal D. The gate terminal G is coupled to the output terminal 1213 of the operational amplifier 121, the source terminal S is coupled to the first resistor R1 of the voltage divider circuit 111 and the input/output line 13, the drain terminal D is coupled to the negative input terminal 1212 of the operational amplifier 121 and the load 127, and the gate terminal G is coupled to the output terminal 1213 of the operational amplifier 121. Accordingly, when the operational amplifier 121 outputs the turn-on signal S5 according to the voltage signal V1 at the high level, the gate terminal G receives the turn-on signal S5 from the output terminal 1213 of the operational amplifier 121 to turn on the switch circuit 122, and the switch circuit 122 generates the current signal as the second communication command S2 according to the voltage level of the voltage signal V1 generated at the negative input terminal 1212 of the operational amplifier 121 when turned on. On the other hand, when the voltage signal V1 is at a low level, the operational amplifier 121 outputs a low level but does not output the turn-on signal S5, the gate terminal G receives a low level, the drain terminal D also has a low level according to the ground terminal coupled to the load 127, the switch circuit 122 is turned off (cut-off), and the switch circuit 122 stops generating the current signal. Accordingly, the switch circuit 122 generates a corresponding current modulation signal according to the high level and the low level of the voltage signal V1 to generate different commands for communicating with the communication device 2.
In one embodiment, as shown in fig. 1, the communication device 1 further comprises a controller 15. The controller 15 may be a Microcontroller (MCU). The controller 15 is coupled to the computing circuit 114 and the second digital-to-analog converter 123, the controller 15 receives the decoding signal S4 from the computing circuit 114, the controller 15 generates the corresponding second digital signal D2 according to the different decoding signal S4, the second digital-to-analog converter 123 performs digital-to-analog conversion according to the different second digital signal D2 to generate the corresponding voltage signal V1, and the switching circuit 122 further generates the current signal corresponding to the voltage signal V1. Here, according to the different first communication command S1, the sending unit 12 can generate the corresponding second communication command S2 in response to the first communication command S1 sent by the communication device 2.
In other embodiments, the controller 15 may generate the different second digital signal D2 in advance or according to the setting of the designer of the communication apparatus 1, and cause the second digital-to-analog converter 123 to perform the corresponding digital-to-analog conversion to generate the corresponding voltage signal V1, and cause the switch circuit 122 to generate the different current signals. Therefore, the communication device 1 can generate the corresponding second communication command S2 according to different communication protocols of the communication devices 2 of different models/specifications, and the communication device 1 has better compatibility.
In one embodiment, the communication device 1 has a first operation mode and a second operation mode, when the communication device 1 is in the first operation mode, the sending unit 12 generates and sends the second communication command S2, when the communication device 1 is in the second operation mode, the sending unit 12 supports the function of voltage detection, and the sending unit 12 does not generate and send the second communication command S2. In the second operation mode, the sending unit 12 receives the stepped-down first communication instruction S1, and detects the voltage level of the stepped-down first communication instruction S1. In detail, referring to fig. 2 and fig. 3, the sending unit 12 further includes two multiplexers 124 and 125 (hereinafter, referred to as a first multiplexer 124 and a second multiplexer 125, respectively) and a switch 126. The first multiplexer 124 and the second multiplexer 125 are two-to-one multiplexers (2-to-1 multiplexers). Two input ends of the first multiplexer 124 are coupled to the second digital-to-analog converter 123 and the connection point C, respectively, and an output end of the first multiplexer 124 is coupled to the positive input end 1211 of the operational amplifier 121. The two input terminals of the second multiplexer 125 are coupled to the output terminal 1213 and the drain terminal D of the operational amplifier 121, respectively, and the output terminal of the second multiplexer 125 is coupled to the negative input terminal 1212 of the operational amplifier 121. The switch 126 is coupled between the gate terminal G and the output terminal 1213 of the operational amplifier 121.
The first multiplexer 124, the second multiplexer 125 and the switch 126 are controlled by the controller 15. When the communication device 1 is in the first operation mode, as shown in fig. 2, the controller 15 generates the control signal C1 to control the output terminal of the first multiplexer 124 to be coupled to the second digital-to-analog converter 123, the controller 15 generates the control signal C2 to control the output terminal of the second multiplexer 125 to be coupled to the drain terminal D, and the controller 15 generates the control signal C3 to control the switch 126 to be turned on. Herein, the output end 1213 of the operational amplifier 121 is coupled to the negative input end 1212 through the switch 126, the switch circuit 122 and the second multiplexer 125 to form the negative feedback line, and the positive input end 1211 of the operational amplifier 121 is coupled to the second digital-to-analog converter 123 through the first multiplexer 124. The operational amplifier 121 generates a current signal based on the voltage signal V1 and the negative feedback line control switch circuit 122.
On the other hand, when the communication device 1 is in the second operation mode, as shown in fig. 3 and 4, the controller 15 generates the control signal C1 to control the output terminal of the first multiplexer 124 to be coupled to the connection point C, the controller 15 generates the control signal C3 to control the switch 126 to be turned off, and generates the control signal C2 to control the output terminal of the second multiplexer 125 to be coupled to the output terminal 1213 of the operational amplifier 121. Here, the line between the output end 1213 and the gate end G of the operational amplifier 121 is an open circuit (open), the output end 1213 of the operational amplifier 121 is coupled to the negative input end 1212 through the second multiplexer 125 to form a single-gain feedback line, and the positive input end 1211 of the operational amplifier 121 is coupled to the voltage divider 111. The positive input 1211 of the operational amplifier 121 receives the first communication command S1 after being stepped down from the connection point C via the first multiplexer 124, and based on the feedback line with single gain, the output 1213 of the operational amplifier 121 outputs the voltage level of the first communication command S1 after being stepped down, and the output 1213 of the operational amplifier 121 may be further coupled to the analog-to-digital converter 128 for converting the voltage level of the first communication command S1 after being stepped down into a digital signal for other applications.
In one embodiment, referring to fig. 5, the communication devices 1 and 2 are applied to a fire fighting system, the communication device 1 can be a smoke detection device or a manual alarm device, and the communication device 2 can be a fire fighting host. The communication device 2, which is a fire-fighting host, may be coupled to at least one communication device 1 (fig. 4 illustrates an example in which the communication device 2 is coupled to three communication devices 1, but the disclosure is not limited thereto). The communication device 2 is coupled to the communication device 1 via a power line 3 and a ground line 4. The communication device 2 sends a power signal to the communication device 1 via the power line 3, and the communication device 2 sends the first communication command S1 to the communication device 1 via the power line 3 for communication with the communication device 1. The communication device 1 also sends a second communication command S2 to the communication device 2 via the power line 3 to communicate with the communication device 2. When the communication device 2 detects that the current value on the power supply line 3 has changed, the communication device 2 knows that the communication device 1 has transmitted the second communication command S2. For example, when the communication device 1 does not transmit the second communication command S2, the current value on the power supply line 3 is 2mA, and when the communication device 1 transmits the second communication command S2 with 50mA, the current value on the power supply line 3 changes to 52mA, and at this time, the communication device 2 further decodes the second communication command S2 to complete the communication of the communication device 1 with respect to the communication device 2.
In summary, according to an embodiment of the communication device, the receiving unit thereof and the transmitting unit thereof of the present disclosure, the communication device supports the function of voltage detection, and the transmitting unit of the communication device generates the constant current signal as the communication command, and the constant current signal can improve the communication quality. Moreover, the sending unit and the receiving unit comprise digital-to-analog converters which generate adjustable voltage signals according to the adjustable digital signals, so that the sending unit and the receiving unit can be flexibly designed according to the communication specifications of different fire-fighting hosts and can flexibly operate, and further the performance and the compatibility of products are improved.
Although the present disclosure has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the disclosure, and therefore, the scope of the disclosure should be determined by that of the appended claims.
Claims (11)
1. A communication device for a fire protection system, comprising:
a receiving unit, configured to receive a first communication command from another communication device and generate a first communication command after voltage reduction, generate a pwm signal according to the first communication command after voltage reduction, and decode the pwm signal according to a pulse width of the pwm signal at a high level and a pulse width of the pwm signal at a low level to generate a decoded signal; and
a sending unit, comprising:
an operational amplifier for generating a turn-on signal according to a voltage signal, comprising:
a positive input end for receiving the voltage signal;
a negative input terminal; and
an output terminal coupled to the negative input terminal for outputting the conducting signal; and
and the switch circuit is coupled between the negative input end and the output end and used for being conducted according to the conducting signal and generating a current signal as a second communication instruction to be output to the other communication device according to the voltage signal when the switch circuit is conducted.
2. The communication device of claim 1, wherein the receiving unit comprises:
the voltage division circuit is used for carrying out voltage division conversion on the first communication command so as to generate the first communication command after voltage reduction;
a first digital-to-analog converter for generating a reference voltage according to a first digital signal;
a comparison circuit for comparing the reference voltage with the first communication command after voltage reduction to generate the pulse width modulation signal; and
and a calculating circuit for calculating the pulse width of the PWM signal at high level and the pulse width of the PWM signal at low level to generate the decoding signal.
3. The communication device according to claim 2, wherein the voltage divider circuit comprises a first resistor and a second resistor connected to each other, and a connection point between the first resistor and the second resistor generates the first communication command after voltage reduction.
4. The communication device as claimed in claim 2, wherein the transmitter unit further comprises a second digital-to-analog converter coupled to the positive input terminal, the second digital-to-analog converter generating the voltage signal according to a second digital signal.
5. The communication device as claimed in claim 4, wherein the positive input terminal of the operational amplifier further receives the first communication command after being stepped down, the operational amplifier generates a voltage level according to the first communication command after being stepped down, and the output terminal outputs the voltage level.
6. The communication device of claim 5, wherein the sending unit further comprises a switch, a first multiplexer and a second multiplexer, the communication device has a first operation mode and a second operation mode, when the communication device is in the first operation mode, the switch is turned on to couple a control terminal and the output terminal of the switch circuit, the first multiplexer is coupled to the second digital-to-analog conversion circuit and the positive input terminal, the second multiplexer is coupled to a drain terminal and the negative input terminal of the switch circuit, the operational amplifier generates the turn-on signal according to the voltage signal in the first operation mode; when the communication device is in the second operation mode, the switch is turned off to open the circuit between the control terminal and the output terminal, the first multiplexer is coupled to the positive input terminal and the voltage dividing circuit, the second multiplexer is coupled to the negative input terminal and the output terminal, and the operational amplifier generates and outputs the voltage level according to the first communication command after voltage reduction in the second operation mode.
7. The communication device of claim 1, further comprising:
a controller coupled to the receiving unit and the transmitting unit, the controller generating a second digital signal according to the decoded signal;
the sending unit further includes a second digital-to-analog converter coupled to the positive input terminal, the second digital-to-analog converter generating the voltage signal according to the second digital signal.
8. The communication device as claimed in claim 1, wherein the first communication command is a voltage modulation signal, the input terminal further receives a power signal via a power line, the power line couples the communication device and the another communication device, and the first communication command is from the power line.
9. The communication device as claimed in claim 1, wherein the transmitting unit further comprises a load having a resistance value coupled between the switching circuit and the ground, the switching circuit generating the current signal as a constant current according to the voltage level of the voltage signal and the load.
10. A receiving unit in communication with a communication device, comprising:
the voltage division circuit is used for receiving a communication instruction from a communication device and carrying out voltage division conversion on the communication instruction so as to generate the communication instruction after voltage reduction;
a digital-to-analog converter for generating a reference voltage according to a digital signal;
a comparison circuit for comparing the reference voltage with the stepped-down communication command to generate a pulse width modulation signal; and
and the calculating circuit is used for calculating the pulse width of the pulse width modulation signal at a high level and the pulse width of the pulse width modulation signal at a low level so as to generate a decoding signal.
11. A sending unit in communication with a communication device, comprising:
a digital-to-analog converter for generating a voltage signal according to a digital signal;
an operational amplifier for generating a turn-on signal according to the voltage signal, comprising:
a positive input end for receiving the voltage signal;
a negative input terminal; and
an output terminal coupled to the negative input terminal for outputting the conducting signal; and
and the switch circuit is coupled between the negative input end and the output end to form a negative feedback circuit and is used for being conducted according to the conducting signal and generating a current signal as a communication instruction to be output to the communication device according to the voltage signal when the switch circuit is conducted.
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Also Published As
| Publication number | Publication date |
|---|---|
| CN112039550B (en) | 2024-03-15 |
| TW202044775A (en) | 2020-12-01 |
| TWI692210B (en) | 2020-04-21 |
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