CN112039550B - Communication device, receiving unit and transmitting unit thereof - Google Patents
Communication device, receiving unit and transmitting unit thereof Download PDFInfo
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- CN112039550B CN112039550B CN201910515724.2A CN201910515724A CN112039550B CN 112039550 B CN112039550 B CN 112039550B CN 201910515724 A CN201910515724 A CN 201910515724A CN 112039550 B CN112039550 B CN 112039550B
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- 230000006854 communication Effects 0.000 title claims abstract description 193
- 238000004891 communication Methods 0.000 title claims abstract description 193
- 230000009467 reduction Effects 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000003990 capacitor Substances 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
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
Classifications
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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
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Abstract
The disclosure provides a communication device, a receiving unit and a transmitting unit thereof. The receiving unit generates a communication command after depressurization according to a first communication command from another communication device, generates a pulse width modulation signal according to the communication command after depressurization, and decodes the pulse width modulation signal to generate a decoded signal. The transmitting unit includes an operational amplifier and a switching circuit. The operational amplifier generates a conduction signal according to a voltage signal. The operational amplifier includes 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, converting the voltage using the capacitor is prone to generate a problem of unstable converted voltage, resulting in decoding errors, resulting in communication failure. Furthermore, the communication device generally has only a function of transmitting and receiving signals, and has no other functions, and the communication device has a single function, which makes it difficult to support different product applications. Further, conventional communication devices often use a large number of components, resulting in complicated components, and when the communication device is failed, it is difficult for a maintenance person to detect the cause of the failure.
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 and generating a first communication instruction after depressurization, generating a pulse width modulation signal according to the first communication instruction after depressurization, 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 switching circuit. The operational amplifier is used for generating a conduction signal according to the voltage signal. The operational amplifier includes 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 conduction signal. The switch circuit is coupled between the negative input end and the output end of the operational amplifier, and 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 dividing circuit, a digital-to-analog converter, a comparison circuit and a calculation circuit. The voltage dividing circuit is used for receiving a communication instruction from the communication device and performing voltage division conversion on the communication instruction to generate a reduced-voltage communication instruction. 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 the step-down 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-to-analog converter, an operational amplifier and a switching 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 conduction 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, and 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 signal flow when the communication device of fig. 1 is operated in a 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 protection system.
Reference numerals illustrate:
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. Computing circuit
12. Transmitting unit
121. Operational amplifier
1211. Positive input terminal
1212. Negative input terminal
1213. An output terminal
122 switch circuit
G gate terminal
D drain terminal
S source terminal
123. Second digital-to-analog converter
124. First multiplexer
125. Second multiplexer
126. Switch
127. Load(s)
128. Analog-to-digital converter
13. Input/output circuit
15. Controller for controlling a power supply
2 communication device
3 Power supply line
4 grounding circuit
C connection point
C1 Control signal
C2 Control signal
C3 Control signal
D1 A first digital signal
D2 Second digital signal
V1 voltage signal
V2 reference voltage
S1 first communication instruction
S2 second communication instruction
S3 PWM signal
S4 decoding signal
S5 on signal
Detailed Description
Fig. 1 is a block diagram of an embodiment of a communication device 1 according to the present disclosure, please refer to fig. 1. The communication device 1 can bidirectionally communicate with another communication device 2. The communication device 1 may receive a communication instruction S1 (hereinafter referred to as a first communication instruction S1 for convenience of description) from the communication device 2 and decode the first communication instruction S1 (hereinafter referred to as an instruction receiving program), and the communication device 1 may generate another communication instruction (hereinafter referred to as a second communication instruction S2) and transmit to the communication device 2 (hereinafter referred to as an instruction transmitting program) to establish bidirectional communication between the communication device 1 and the communication device 2. In one embodiment, the first communication command S1 is a voltage modulation signal.
Taking the communication device 1 as an example, the communication device 1 includes a set of receiving units 11 and transmitting units 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 line 13 receives the first communication command S1 from the communication device 2, the input/output line 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 step-down first communication command S1, the receiving unit 11 then generates a pulse width modulation (pulse width modulation; PWM) signal S3 according to the step-down first communication command S1, the receiving unit 11 calculates a pulse width (hereinafter referred to as a first width) of the PWM signal S3 at a high level and a pulse width (hereinafter referred to as a second width) of the PWM signal S3 at a low level, and the receiving unit 11 decodes the PWM signal S3 according to the first width and the second width to generate a decoded signal S4. For example, taking the example that the pulse width at the high bit is twice the pulse width at the low bit and the pulse width at the low bit is twice the pulse width at the high bit and the pulse width at the high bit is denoted by logic "0", the receiving unit 11 generates the decoding signal S4 including logic "1" when the receiving unit 11 calculates the first width to be twice the second width, and the receiving unit 11 generates the decoding signal S4 including logic "0" when the receiving unit 11 calculates the second width to be twice the first width.
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 apparatus 2. The transmitting unit 12 includes an operational amplifier 121 and a switching circuit 122. The operational amplifier 121 includes a positive input terminal 1211, a negative input terminal 1212, and an output terminal 1213. The positive input terminal 1211 receives a voltage signal V1, wherein the voltage signal V1 includes different voltage levels switched between a high level and a low level; the negative input 1212 is coupled to the output 1213 via the switching circuit 122 (i.e., the switching circuit 122 is coupled between the negative input 1212 and the output 1213) such that the operational amplifier 121 has a negative feedback (feed-back) line.
Here, the operational amplifier 121 generates the on signal S5 when the voltage signal V1 received by the positive input terminal 1211 is at a high level, and the switch circuit 122 receives the on signal S5 and is turned on according to the 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 switching circuit 122 receives the voltage level of the voltage signal V1 generated by the negative input terminal 1212, and the switching circuit 122 generates the current signal according to the voltage level of the voltage signal V1 when turned on, and the current signal is used as the second communication command S2 to output the second communication command S2 to the communication device 2 through the output/input line 13 of the communication device 1. Accordingly, the switching circuit 122 generates a current signal according to the voltage signal having a stable and precise voltage level from the operational amplifier 121, and the current signal generated by the switching circuit 122 is also stable and precise, 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 transmitting 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, and 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, so that the current of the constant current signal is stable, and the communication quality between the communication device 1 and the communication device 2 is 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 comparing circuit 113 is coupled between the voltage dividing circuit 111 and the calculating circuit 114, and the comparing circuit 113 is coupled between the first digital-to-analog converter 112 and the calculating circuit 114. In one embodiment, the first communication command S1 has a voltage level of 30-40V, the voltage dividing circuit 111 receives the first communication command S1 from the input/output line 13 and performs voltage dividing conversion on the first communication command S1 to generate a first communication command S1 after voltage reduction, and the first communication command S1 after voltage reduction 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). The two input ends of the comparing circuit 113 are respectively coupled to the voltage dividing circuit 111 and the output end of the first digital-analog converter 112, the comparing circuit 113 receives the first communication command S1 after voltage reduction from the voltage dividing circuit 111 and the reference voltage V2 from the first digital-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 first communication command S1 after voltage reduction is greater than the reference voltage V2, the comparing 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 comparing circuit 113 outputs a low level, and then the comparing circuit 113 generates the PWM signal S3 according to the first communication command S1 after voltage reduction and the reference voltage V2, the calculating circuit 114 receives the PWM signal S3 from the comparing circuit 113, and the calculating 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 digital-to-analog converters 112, a plurality of comparing circuits 113 and a plurality of calculating circuits 114, wherein the plurality of first digital-to-analog converters 112 respectively generate different reference voltages V2, the plurality of comparing circuits 113 respectively compare the first communication command S1 after voltage reduction with the different reference voltages V2 at different time points, so that the plurality of calculating circuits 114 respectively generate a plurality of decoding signals S4 corresponding to the first communication command S1 of the multi-stage voltage signal.
In an embodiment, referring to fig. 1 and 2, the voltage divider 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 the resistance of the second resistor R2 is greater than that of the first resistor R1. Then, according to the resistance values of the first resistor R1 and the second resistor R2, the voltage dividing circuit 111 performs voltage dividing conversion on the first communication command S1 to generate a stepped-down first communication command S1, one input end of the comparing circuit 113 is coupled to the connection point C between the first resistor R1 and the second resistor R2, and the comparing circuit 113 generates the PWM signal S3 according to the stepped-down first communication command S1 and the reference voltage V2 received from the connection point C.
In an embodiment, referring to fig. 1 and 2, the transmitting 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 a 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), and the second digital-to-analog converter 123 transmits the voltage signal V1 to the positive input end 1211 of the operational amplifier 121, so that the operational amplifier 121 generates a conducting signal S5 according to the voltage signal V1, and a negative input end 1212 of the operational amplifier 121 generates a voltage level of the voltage signal V1.
Furthermore, as shown in FIG. 2, the switching circuit 122 includes a transistor, such as a Metal-Oxide-semiconductor field effect transistor (MOSFET), and the switching 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 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 on signal S5 according to the voltage signal V1 at the high level, the gate terminal G receives the on signal S5 from the output terminal 1213 of the operational amplifier 121 to turn on the switching circuit 122, and when the switching circuit 122 is turned on, the switching circuit 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. On the other hand, when the voltage signal V1 is at the low level, the operational amplifier 121 outputs the low level and does not output the on signal S5, the gate terminal G receives the low level, the drain terminal D also has the low level according to the ground terminal coupled to the load 127, and the switch circuit 122 is turned off (cut-off), and the switch circuit 122 stops generating the current signal. Accordingly, the switching circuit 122 generates corresponding current modulation signals according to the high level and the low level of the voltage signal V1 to generate different commands for communication with the communication device 2.
In an 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 a corresponding second digital signal D2 according to the decoding signal S4, the second digital-to-analog converter 123 generates a corresponding voltage signal V1 according to the digital-to-analog conversion of the second digital signal D2, and the switch circuit 122 generates a current signal corresponding to the voltage signal V1. Here, according to the different first communication command S1, the transmitting unit 12 may generate the corresponding second communication command S2 in response to the first communication command S1 transmitted by the communication device 2.
In other embodiments, the controller 15 may generate different second digital signals D2 in advance or according to the setting of the designer of the communication device 1, so that the second digital-to-analog converter 123 performs corresponding digital-to-analog conversion to generate corresponding voltage signals V1, and the switch circuit 122 correspondingly generates 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 with different models/specifications, and the communication device 1 has better compatibility.
In an 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, and 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 transmission unit 12 receives the first communication instruction S1 after the step-down, and detects the voltage level of the first communication instruction S1 after the step-down. In detail, referring to fig. 2 and 3, the transmitting 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 mux). The two input terminals of the first multiplexer 124 are coupled to the second digital-to-analog converter 123 and the connection point C, respectively, and the output terminal of the first multiplexer 124 is coupled to the positive input terminal 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. Switch 126 is coupled between gate terminal G and output terminal 1213 of op amp 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, and 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. Here, 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 controls the switching circuit 122 to generate a current signal based on the voltage signal V1 and the negative feedback line.
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 terminal 1213 and the gate terminal G of the operational amplifier 121 is open (open), the output terminal 1213 of the operational amplifier 121 is coupled to the negative input terminal 1212 through the second multiplexer 125 to form a feedback line with single gain (uni-gain), and the positive input terminal 1211 of the operational amplifier 121 is coupled to the voltage divider 111. The positive input end 1211 of the operational amplifier 121 receives the step-down first communication command S1 from the connection point C through the first multiplexer 124, and based on the single-gain feedback line, the output end 1213 of the operational amplifier 121 outputs the voltage level of the step-down first communication command S1, and the output end 1213 of the operational amplifier 121 may be further coupled to the analog-to-digital converter 128 to convert the voltage level of the step-down first communication command S1 into a digital signal for other applications.
In an embodiment, referring to fig. 5, the communication device 1 and 2 are applied to a fire protection system, the communication device 1 may be a smoke detection device or a manual alarm device, and the communication device 2 may be a fire protection host. The communication device 2 as a fire engine may be coupled to at least one communication device 1 (fig. 5 illustrates that 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 transmits a power signal to power the communication device 1 via the power line 3, and the communication device 2 transmits the first communication command S1 to the communication device 1 via the power line 3 to communicate with the communication device 1. The communication device 1 also transmits 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 line 3 changes, the communication device 2 can learn that the communication device 1 transmits 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 line 3 is 2mA, and when the communication device 1 transmits the second communication command S2 with 50mA, the current value on the power line 3 is changed to 52mA, and at this time, the communication device 2 decodes the second communication command S2 to complete the communication of the communication device 1 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 a constant current signal as a communication command, and the constant current signal can improve the communication quality. Furthermore, the sending unit and the receiving unit comprise digital-analog converters, and the digital-analog converters 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 the sending unit and the receiving unit can be flexibly operated, 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 the invention is not limited thereto, but rather by one skilled in the art, as long as modifications and variations can be made thereto without departing from the spirit and scope of the present disclosure as defined in the following claims.
Claims (7)
1. A communication device adapted for a fire protection system, comprising:
the receiving unit is used for receiving a first communication instruction from another communication device and generating a first communication instruction after depressurization, generating a pulse width modulation signal according to the first communication instruction after depressurization, 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;
a controller coupled to the receiving unit for generating a corresponding second digital signal according to the decoding signal; and
A transmitting unit coupled to the controller, comprising:
a second digital-to-analog converter for generating a voltage signal according to the second digital signal;
an operational amplifier for generating a turn-on signal according to the voltage signal, comprising:
a positive input terminal coupled to the second digital-to-analog converter for receiving the voltage signal;
a negative input terminal; and
An output end coupled to the negative input end for outputting the on signal; and
A switch circuit coupled between the negative input end and the output end for generating a current signal as a second communication command to the other communication device according to the conducting signal and the voltage signal when conducting,
the communication device is provided with a first operation mode and a second operation mode, when the communication device is in the first operation mode, the switch is conducted to be coupled with a control end and the output end of the switch circuit, the first multiplexer is coupled with the second digital-analog converter and the positive input end, the second multiplexer is coupled with a drain end and the negative input end of the switch circuit, and the operational amplifier generates the conducting 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 control end and the output end, the first multiplexer is coupled to the positive input end and a voltage dividing circuit, the second multiplexer is coupled to the negative input end and the output end, and the operational amplifier generates and outputs a voltage level according to the first communication command after voltage reduction in the second operation mode.
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 instruction so as to generate the first communication instruction 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 a high level and the pulse width of the PWM signal at a low level to generate the decoding signal.
3. The communication device of claim 2, wherein the voltage divider circuit comprises a first resistor and a second resistor connected to each other, a connection point between the first resistor and the second resistor generating the first communication command after voltage reduction.
4. The communication device of claim 1, wherein the positive input of the operational amplifier further receives the first communication command after the step-down, the operational amplifier generates the voltage level according to the first communication command after the step-down and the output outputs the voltage level.
5. The communication device of claim 1, wherein the first communication command is a voltage modulated signal, the input further receives a power signal via a power line, the power line couples the communication device and the other communication device, and the first communication command is from the power line.
6. The communication device of claim 1, wherein the transmitting unit further comprises a load having a resistance value coupled between a switching circuit and ground, the switching circuit generating the current signal according to the voltage level and the load.
7. A transmitting unit for communicating 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 terminal for receiving the voltage signal;
a negative input terminal; and
An output end coupled to the negative input end for outputting the on signal; and
A switch circuit coupled between the negative input end and the output end to form a negative feedback circuit for generating a current signal as a communication command to the communication device according to the conducting signal and the voltage signal when conducting,
a switch, a first multiplexer and a second multiplexer;
when the communication device is in the first operation mode, the switch is conducted to be coupled with a control end and the output end of the switch circuit, the first multiplexer is coupled with the digital-analog converter and the positive input end, the second multiplexer is coupled with a drain end and the negative input end of the switch circuit, and the operational amplifier generates the conducting 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 control end and the output end, the first multiplexer is coupled to the positive input end and a voltage dividing circuit, the second multiplexer is coupled to the negative input end and the output end, and the operational amplifier generates and outputs a voltage level according to a first communication instruction after voltage reduction in the second operation mode.
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| TW108116811A TWI692210B (en) | 2019-05-15 | 2019-05-15 | Communication device |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN112039550A (en) | 2020-12-04 |
| TW202044775A (en) | 2020-12-01 |
| TWI692210B (en) | 2020-04-21 |
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