CN116126765B - Signal transmission circuit and method - Google Patents
Signal transmission circuit and method Download PDFInfo
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- CN116126765B CN116126765B CN202310406407.3A CN202310406407A CN116126765B CN 116126765 B CN116126765 B CN 116126765B CN 202310406407 A CN202310406407 A CN 202310406407A CN 116126765 B CN116126765 B CN 116126765B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4004—Coupling between buses
- G06F13/4022—Coupling between buses using switching circuits, e.g. switching matrix, connection or expansion network
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/382—Information transfer, e.g. on bus using universal interface adapter
- G06F13/385—Information transfer, e.g. on bus using universal interface adapter for adaptation of a particular data processing system to different peripheral devices
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4063—Device-to-bus coupling
- G06F13/4068—Electrical coupling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Abstract
The invention discloses a signal transmission circuit and a method, comprising the following steps: the device comprises a main control module, a first switch module, a connector, a load, a slave control module and a second switch module; the main control module is respectively connected with the first switch module and the first port of the connector, the first switch module is connected with power supply voltage and is connected with the first port, the first port is respectively connected with the load and the slave control module, the slave control module is connected with the second switch module, and the second switch module is connected with the first port. The connection reliability is improved, safety accidents caused by poor contact between ports are avoided, and bidirectional signal transmission between the master control module and the slave control module is realized under the condition of heavy current load.
Description
Technical Field
The present invention relates to the field of signal transmission technologies, and in particular, to a signal transmission circuit and method.
Background
At present, a host circuit and a slave circuit driven by a high-current load are connected together by a high-current load H1. As shown in fig. 1, the master circuit and the slave circuit are connected by an electronic connector. The electronic connector has three connection terminals: GND of the two circuits are connected together and are public ground, and one end of a high-current load H1 is connected at the same time; the AT port of the host circuit is connected with the other end of the heavy current load H1 and the VDD port of the slave circuit, and provides energy for the heavy current load and power for the slave circuit; the data ports DA of the two circuits are connected together to realize bidirectional transmission of signals between the two circuits.
On the one hand, however, the portable electronic product employs the three-connection-terminal electronic connector shown in fig. 1 because of space limitation, and the physical size of each terminal is too small, which may affect the reliability of connection. Especially AT and GND port connection are not firm, have comparatively great contact resistance, make the contact generate heat, cause the potential safety hazard. On the other hand, the large current load H1 has small resistance and large current, and has interference on data transmission of the slave signals, so that the master circuit cannot identify the slave signals.
Accordingly, the prior art is still in need of improvement and development.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a signal transmission circuit and method, so as to solve the problems that when three terminals are adopted to realize data transmission and power supply, poor contact between ports causes safety accidents, and large current load current is large, and interference exists on a slave signal, so that a master circuit cannot identify the slave signal.
The present invention provides a signal transmission circuit, comprising: the device comprises a main control module, a first switch module, a connector, a load, a slave control module and a second switch module;
the main control module is respectively connected with the first switch module and the first port of the connector and is used for outputting a host data signal to the first switch module, detecting the voltage variation of a slave communication signal transmitted by the first port and outputting a first digital signal according to the voltage variation so as to identify the slave communication signal;
the first switch module is connected to a power supply voltage and is connected with the first port, and is used for switching on or switching off according to the host data signal and outputting a power supply communication signal to the first port;
the first port is respectively connected with the load and the slave control module and is used for supplying power to the load according to a power supply communication signal and transmitting the power supply communication signal to the slave control module;
the slave control module is connected with the second switch module and is used for receiving the power supply communication signal and outputting a slave data signal to the second switch module;
the second switch module is respectively connected with the load and the first port, and is used for shunting the load according to the slave computer data signal and outputting the slave computer communication signal to the first port.
The invention further provides that the main control module comprises a first control module and a first detection module;
the first detection module is connected with the first port and is used for detecting the slave communication signal and converting the slave communication signal into the first digital signal;
the first control module is respectively connected with the first switch module and the first detection module and is used for outputting a host data signal to the first switch module and receiving the first digital signal sent by the first detection module when receiving the effective signal.
The invention further provides that the slave control module comprises: the device comprises a power supply module, a second control module and a second detection module;
the power supply module is respectively connected with the first port, the second detection module and the second control module and is used for supplying power to the second detection module and the second control module according to the power supply communication signal;
the second detection module is connected with the first port and is used for detecting the power supply communication signal and converting the power supply communication signal into a second digital signal;
the second control module is respectively connected with the second detection module and the second switch module, and is used for receiving the second digital signal and outputting a slave data signal to the second switch module after receiving the second digital signal.
The invention further provides that the first switch module comprises: a first switch, a second switch, and a first resistor;
the input of first switch respectively with supply voltage and the input of second switch is connected, the drive end of first switch with first control module is connected, the output of first switch respectively with first detection module the one end of first resistance and first port connection, the other end of first resistance with the output of second switch is connected, the drive end of second switch with first control module is connected.
The invention further provides that the second switch module comprises a third switch and a second resistor;
one end of the second resistor is connected with the first port and the load respectively, and the other end of the second resistor is connected with the input end of the third switch;
the driving end of the third switch is connected with the second control module, and the output end of the third switch is grounded.
The invention also provides a signal transmission method, which is applied to the signal transmission circuit, and comprises the following steps:
outputting a host data signal to a first switch module through a main control module;
the first switch module is turned on or off according to the host data signal and outputs a power supply communication signal to a first port;
the first port supplies power to a load and a slave control module according to the power supply communication signal;
the slave control module receives the power supply communication signal through the first port and outputs a slave data signal to the second switch module after receiving the power supply communication signal;
the second switch module shunts the load according to the slave data signal and outputs a slave communication signal to a first port;
the master control module detects the voltage variation of the slave communication signal and converts the voltage variation into a first digital signal according to the voltage variation so as to identify the slave communication signal.
The invention further provides that the step of conducting or intercepting the first switch module according to the host data signal and outputting a power supply communication signal to the first port comprises the following steps:
the first switch module is turned on when the host data signal is at a high level, and turned off when the host data signal is at a low level.
The invention further provides that the step of conducting or intercepting the second switch module according to the slave computer data signal and outputting the slave computer communication signal to the first port comprises the following steps:
the second switch module is turned on when the slave data signal is at a high level, and turned off when the slave data signal is at a low level.
According to the signal transmission circuit provided by the invention, the first switch module is arranged, the first switch module conducts or intercepts according to the power supply voltage and the host data signal, when conducting, the first switch module is equivalent to outputting electric energy and a high-level signal to the first port, when shutting, the first switch module is equivalent to outputting a low-level signal to the first port, and the first switch module is respectively connected with the load and the slave control module through the first port, so that the host data signal is transmitted to the slave control module while the load and the slave control module are powered, the slave control module outputs the slave data signal to the second switch module after receiving the host data signal, and the second switch module shunts the load according to the slave data signal, so that the master control module detects the voltage variation of the slave communication signal to identify the slave communication signal, and the bidirectional signal transmission between the master control module and the slave control module is realized under the condition of a large current load.
In other words, in the invention, power supply and bidirectional signal transmission can be realized through two ports (the other port is grounded), and under the condition that the connector has only two ports, the reliability of connection can be improved by increasing the area of the ports, so that poor contact between the ports is avoided, and safety accidents are caused. And the load is shunted through the second switch module, so that the master control module detects the voltage variation of the slave communication signal to identify the slave communication signal, and bidirectional signal transmission between the master control module and the slave control module is realized under the condition of heavy current load.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other structures can be obtained according to the structures shown in the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a prior art signal transmission circuit.
Fig. 2 is a block diagram of a signal transmission circuit in the present invention.
Fig. 3 is a schematic diagram of a signal transmission circuit in accordance with the present invention.
Fig. 4 is a flow chart of a signal transmission method in the present invention.
Detailed Description
The invention provides a signal transmission circuit and a signal transmission method, which are used for making the purposes, technical schemes and effects of the invention clearer and more definite, and the invention is further described in detail below by referring to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the description and claims, unless the context specifically defines the terms "a," "an," "the," and "the" include plural referents. If there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.
It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. The term "and/or" as used herein includes all or any element and all combination of one or more of the associated listed items.
It will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The inventor researches that three connection ends are generally adopted to realize the functions of data transmission and power supply in portable electronic products. However, on the one hand, due to space limitation, the physical size of each terminal is too small to influence the connection reliability, and when the port connection is not firm, a relatively large contact resistance is formed at the port connection position, so that the port contact heats, and potential safety hazards are caused.
On the other hand, the signal transmission circuit is provided with a large current load, when the slave circuit transmits signals to the host circuit, the host circuit cannot identify the high level and the low level of the slave signal because the transmission signal current of the slave circuit is too small and the current of the load is too large.
The invention provides a signal transmission circuit and a signal transmission method aiming at the technical problems.
Referring to fig. 2 to 3, the present invention provides a signal transmission circuit according to a preferred embodiment.
As shown in fig. 2, the present invention provides a signal transmission circuit, comprising: the device comprises a main control module 100, a first switch module 200, a connector 300, a load 400, a slave control module 500 and a second switch module 600; the main control module 100 is respectively connected with the first switch module 200 and the first port P1 of the connector 300, and is configured to output a host data signal to the first switch module 200, detect a voltage variation of a slave communication signal transmitted by the first port P1, and convert the voltage variation into a first digital signal according to the voltage variation so as to identify the slave communication signal; the first switch module 200 is connected to a power supply voltage VCC and is connected to the first port P1, and is configured to be turned on or off according to the host data signal, and output a power supply communication signal to the first port P1; the first port P1 is connected to the load 400 and the slave control module 500, and is configured to supply power to the load 400 according to a power supply communication signal, and transmit the power supply communication signal to the slave control module 500; the slave control module 500 is connected to the second switch module 600, and is configured to receive the power supply communication signal and output a slave data signal to the second switch module 600; the second switch module 600 is connected to the first port P1, and is configured to shunt the load according to the slave data signal, and output a slave communication signal to the first port P1.
Specifically, the connector 300 includes a first port P1 and a second port P2, where the first port P1 is respectively connected to the master control module 100, the first switch module 200, the load 400, the slave control module 500, and the second switch module 600, and the second port P2 is respectively connected to a ground terminal of the master control module 100, a ground terminal of the load 400, a ground terminal of the second switch module 600, and a ground terminal of the slave control module 500; wherein the second switching module 600 is connected in parallel with the load 400.
In particular, when the master control module 100 transmits the master control data signal to the slave control module 500, since the master data signal is a series of pulse groups consisting of a high level and a low level, when the master control data signal is at the high level, the first switch module 200 is turned on, and the master control module 100 outputs the power supply communication signal (at this time, the power supply communication signal is at the high level) through the first port P1, and provides electric energy to the load 400 and the slave control module 500, and simultaneously transmits the master data signal in the form of the high level to the slave control module 500. When the master control data signal is at a low level, the first switch module 200 is turned off, and the master control module 100 outputs the power supply communication signal (at this time, the power supply communication signal is at a low level) through the first port P1, stops providing the power to the load 400 and the slave control module 500, and simultaneously transmits the host data signal in a low level form to the slave control module 500, so as to realize power supply and simultaneously realize transmission of the host data signal.
After the slave control module 500 receives the master data signal, the slave control module 500 outputs the slave data signal, controls the second switch module 600 to be turned on or off according to the slave data signal, and when the second switch module 600 is turned on, the second switch module 600 is connected in parallel with the load 400, so that the second switch module 600 shunts the load, and the voltage value of the first port P1 is reduced, thereby transmitting a low level signal (slave communication signal) to the master control module 100. When the second switch module 600 is turned off, the second switch module 600 does not shunt the load, the voltage of the first port P1 is higher than the voltage of the load 400 when the second switch module 600 is connected in parallel with the load 400, and this is equivalent to sending a high-level signal (a slave communication signal) to the master control module 100, so as to realize the transmission of the slave data signal, and further, when the connector has only two ports (the first port and the second port), the power supply and the bidirectional data transmission can be realized, and meanwhile, the area of the ports can be increased, so as to improve the connection reliability, thereby avoiding poor contact between the ports and causing a safety accident.
It should be noted that, the load 400 is a heavy current load, the load is split by the second switch module, and the master control module detects the slave communication signal transmitted from the first port in the form of a voltage variation, so that the master circuit can identify the high level and the low level of the slave communication signal output by the slave circuit under the heavy current load.
In one embodiment, as shown in fig. 3, the main control module 100 includes a first control module 110 and a first detection module 120; the first detection module 120 is connected to the first port P1, and is configured to detect the slave communication signal and convert the slave communication signal into the first digital signal; the first control module 110 is respectively connected to the first switch module 200 and the first detection module 120, and is configured to output a host data signal to the first switch module 200 and receive the first digital signal sent by the first detection module when receiving the valid signal.
Specifically, the first control module 110 includes a signal input terminal P3, and when the signal input terminal P3 receives a valid signal, the first control module 110 enters an operating state to output the host data signal. When the signal input terminal P3 receives the disable signal, the first control module 110 enters a standby state and enters a power saving mode. The effective signal and the ineffective signal may be high and low levels, or may be pulses with different frequencies, which is not limited in particular.
The first detection module 120 receives the slave data signal, that is, the slave communication signal, through the first port P1, and the slave communication signal is at a high level and a low level with different voltage values, so that the first detection module 120 is required to detect the slave communication signal to distinguish the high level and the low level. The first detection module 120 converts the slave communication signal into the first digital signal after detection, so that the first control module 110 can identify the slave communication signal. When the first control module 110 receives a first digital signal, the first digital signal is identified, and a processing operation is performed according to the first digital signal. For example, the first control module 110 may control the external component to operate according to the first digital signal output instruction, or may determine whether the master control module 100 and the slave control module 500 are matched according to the first digital signal, which is not limited in particular.
In one embodiment, as shown in fig. 3, the slave module includes: a power module 510, a second control module 520, and a second detection module 530; the power module 510 is connected to the first port P1, the second detection module 530, and the second control module 520, respectively, and is configured to supply power to the second detection module 530 and the second control module 520 according to the power supply communication signal; the second detection module 530 is connected to the first port P1, and is configured to detect the power supply communication signal and convert the power supply communication signal into a second digital signal; the second control module 520 is connected to the second detection module 530 and the second switch module 600, respectively, and is configured to receive the second digital signal and output a slave data signal to the second switch module 600.
Specifically, since the high level and the low level voltage values of the power supply communication signal are different, the power supply module 510 needs to convert the power supply communication signal having a voltage value variation into a signal having a stable voltage value to supply power to the second detection module 530 and the second control module 520. Wherein the low level time of the power supply communication signal is short (e.g., 5 us), the power module 510 can maintain the voltage stable, and continuously supply power to the second detection module 530 and the second control module 520.
After the second detection module 530 obtains the power supply of the power supply module 510, the second detection module detects the high level and the low level of the power supply communication signal according to the voltage value of the first port P1, and converts the power supply communication signal into a second digital signal, so that the second control module 520 can identify the power supply communication signal.
The second control module 520 outputs a slave data signal to the second switch module 600 after receiving the second digital signal, and the second switch module 600 responds to the master control module 100 through the first port P1. It should be noted that, after the master control module 100 sends the host data signal, the slave control module 500 waits for a set time, and if the set time is exceeded, the second switch module 600 does not respond, and the slave control module exits waiting and resends the host data signal.
In one embodiment, as shown in fig. 3, the first switch module 200 includes: a first switch K1, a second switch K2, and a first resistor R1; the input end of the first switch K1 is connected with the power supply voltage VCC and the input end of the second switch K2, the driving end of the first switch K1 is connected with the first control module 110, the output end of the first switch K1 is connected with the first detection module 120, one end of the first resistor R1 and the first port P1, the other end of the first resistor R1 is connected with the output end of the second switch K2, and the driving end of the second switch K2 is connected with the first control module 110. The second switch module 600 includes a third switch K3 and a second resistor R2; one end of the second resistor R2 is connected to the first port P1 and the load 400, and the other end of the second resistor R2 is connected to the input end of the third switch K3; the driving end of the third switch K3 is connected to the second control module 520, and the output end of the third switch K3 is grounded.
Specifically, as shown in fig. 3, when the first control module 110 controls the first switch K1 to be closed, the first port P1 provides power to the load 400 and the slave module 500, and outputs a high level to the slave module 500 (at this time, whether the second switch K2 is closed is not limited). When the first control module 110 controls the first switch K1 to be turned off and the second switch K2 to be turned off, the first port P1 stops supplying power to the load and the slave control module 500, and outputs a low level to the slave control module 500. When the first control module 110 controls the first switch K1 to be turned off and the second switch K2 to be turned on, the first port P1 supplies power to the load 400 and the master control module 100, and the slave data signal starts to be output to the master control module 100 on behalf of the slave control module 500. The slave data signal controls the third switch K3 to be turned on or off, when the third switch K3 is turned on, the voltage of the first port P1 drops, representing that a low level is output to the first detection module 120, and when the third switch K3 is turned off, the voltage of the first port P1 is the voltage of the load 400, representing that a high level is output to the first detection module 120. The first detection module 120 detects the slave communication signal according to the voltage variation of the first port P1, and converts the slave communication signal into a first digital signal, so that the first control module 110 can recognize the slave communication signal.
The invention also provides a signal transmission method, as shown in fig. 4, which comprises the following steps:
s100, outputting a host data signal to the first switch module through the main control module. In particular, the embodiment of the signal transmission circuit is described in detail herein and will not be described in detail herein.
And S200, the first switch module is switched on or off according to the host data signal and outputs a power supply communication signal to a first port. In particular, the embodiment of the signal transmission circuit is described in detail herein and will not be described in detail herein.
In one embodiment, the step S200 includes:
s210, the first switch module is turned on when the host data signal is at a high level, and turned off when the host data signal is at a low level. In particular, the embodiment of the signal transmission circuit is described in detail herein and will not be described in detail herein.
And S300, the first port supplies power for the load and the slave control module according to the power supply communication signal. In particular, the embodiment of the signal transmission circuit is described in detail herein and will not be described in detail herein.
S400, the slave control module receives the power supply communication signal through the first port and outputs a slave data signal to the second switch module. In particular, the embodiment of the signal transmission circuit is described in detail herein and will not be described in detail herein.
S500, the second switch module shunts the load according to the slave data signal and outputs a slave communication signal to the first port. In particular, the embodiment of the signal transmission circuit is described in detail herein and will not be described in detail herein.
In one embodiment, the step S500 includes:
and S510, the second switch module is conducted when the slave data signal is at a high level, and is turned off when the slave data signal is at a low level. In particular, the embodiment of the signal transmission circuit is described in detail herein and will not be described in detail herein.
And S600, the master control module detects the voltage variation of the slave communication signal and converts the voltage variation into a first digital signal according to the voltage variation so as to identify the slave communication signal. In particular, the embodiment of the signal transmission circuit is described in detail herein and will not be described in detail herein.
In summary, the signal transmission circuit provided by the present invention includes: the device comprises a main control module, a first switch module, a connector, a load, a slave control module and a second switch module; the main control module is respectively connected with the first switch module and the first port of the connector and is used for outputting a host data signal to the first switch module, detecting the voltage variation of a slave communication signal transmitted by the first port and converting the voltage variation into a first digital signal so as to identify the slave communication signal; the first switch module is connected to a power supply voltage and is connected with the first port, and is used for switching on or switching off according to the host data signal and outputting a power supply communication signal to the first port; the first port is respectively connected with the load and the slave control module and is used for supplying power to the load according to a power supply communication signal and transmitting the power supply communication signal to the slave control module; the slave control module is connected with the second switch module and is used for receiving the power supply communication signal and outputting a slave data signal to the second switch module; the second switch module is respectively connected with the load and the first port, is used for shunting the load according to the slave computer data signal and outputting the slave computer communication signal to the first port so as to realize power supply and bidirectional data transmission through two ports (the other port is grounded), and the area of the ports is increased through only two ports of the connector so as to improve the connection reliability, and further avoid poor contact between the ports, thereby causing safety accidents. And the second switch module is arranged to shunt the load according to the slave computer data signal, so that the master control module detects the voltage variation of the slave computer communication signal to identify the slave computer communication signal, and bidirectional signal transmission between the master control module and the slave control module is realized under the condition of heavy current load.
It is to be understood that the invention is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims.
Claims (6)
1. A signal transmission circuit, comprising: the device comprises a main control module, a first switch module, a connector, a load, a slave control module and a second switch module;
the main control module is respectively connected with the first switch module and the first port of the connector and is used for outputting a host data signal to the first switch module, detecting the voltage variation of a slave communication signal transmitted by the first port and converting the voltage variation into a first digital signal so as to identify the slave communication signal;
the first switch module is connected to a power supply voltage and is connected with the first port, and is used for switching on or switching off according to the host data signal and outputting a power supply communication signal to the first port;
the first port is respectively connected with the load and the slave control module and is used for supplying power to the load according to the power supply communication signal and transmitting the power supply communication signal to the slave control module;
the slave control module is connected with the second switch module and is used for receiving the power supply communication signal and outputting a slave data signal to the second switch module;
the second switch module is respectively connected with the load and the first port, and is used for shunting the load according to the slave computer data signal and outputting a slave computer communication signal to the first port; wherein the second switch module is connected in parallel with the load;
the main control module comprises a first control module and a first detection module;
the first detection module is connected with the first port and is used for detecting the slave communication signal and converting the slave communication signal into the first digital signal;
the first control module is respectively connected with the first switch module and the first detection module and is used for outputting a host data signal to the first switch module and receiving the first digital signal sent by the first detection module when receiving an effective signal;
the first switch module includes: a first switch, a second switch, and a first resistor;
the input of first switch respectively with supply voltage and the input of second switch is connected, the drive end of first switch with first control module is connected, the output of first switch respectively with first detection module the one end of first resistance and first port connection, the other end of first resistance with the output of second switch is connected, the drive end of second switch with first control module is connected.
2. The signal transmission circuit of claim 1, wherein the slave module comprises: the device comprises a power supply module, a second control module and a second detection module;
the power supply module is respectively connected with the first port, the second detection module and the second control module and is used for supplying power to the second detection module and the second control module according to the power supply communication signal;
the second detection module is connected with the first port and is used for detecting the power supply communication signal and converting the power supply communication signal into a second digital signal;
the second control module is respectively connected with the second detection module and the second switch module, and is used for receiving the second digital signal and outputting a slave data signal to the second switch module.
3. The signal transmission circuit of claim 2, wherein the second switch module comprises a third switch and a second resistor;
one end of the second resistor is connected with the first port and the load respectively, and the other end of the second resistor is connected with the input end of the third switch;
the driving end of the third switch is connected with the second control module, and the output end of the third switch is grounded.
4. A signal transmission method applied to the signal transmission circuit according to any one of claims 1 to 3, the signal transmission method comprising: outputting a host data signal to a first switch module through a main control module;
the first switch module is turned on or off according to the host data signal and outputs a power supply communication signal to a first port;
the first port supplies power to a load and a slave control module according to the power supply communication signal; the slave control module receives the power supply communication signal through the first port and outputs a slave data signal to the second switch module;
the second switch module shunts the load according to the slave data signal and outputs a slave communication signal to a first port;
the master control module detects the voltage variation of the slave communication signal and converts the voltage variation into a first digital signal so as to identify the slave communication signal.
5. The signal transmission method according to claim 4, wherein the step of the first switch module being turned on or off according to the host data signal and outputting a power supply communication signal to the first port comprises:
the first switch module is turned on when the host data signal is at a high level, and turned off when the host data signal is at a low level.
6. The signal transmission method according to claim 4, wherein the step of the second switching module being turned on or off according to the slave data signal and outputting a slave communication signal to the first port comprises:
the second switch module is turned on when the slave data signal is at a high level, and turned off when the slave data signal is at a low level.
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| JP2001128314A (en) * | 1999-10-26 | 2001-05-11 | Denso Corp | Dual power source type load drive control circuit |
| US11226923B1 (en) * | 2020-11-18 | 2022-01-18 | Endress+Hauser SE+Co. KG | One wire power and bi-directional data interface for serial communication |
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| CN102175943B (en) * | 2011-02-12 | 2013-12-11 | 中兴通讯股份有限公司 | Load overcurrent protector state detection device and method |
| CN103293351A (en) * | 2012-02-27 | 2013-09-11 | 鸿富锦精密工业（深圳）有限公司 | Usb interface test load circuit |
| CN106484643B (en) * | 2015-08-28 | 2020-08-21 | 天地融科技股份有限公司 | Communication equipment, system and data sending and receiving method |
| US11461259B2 (en) * | 2019-10-22 | 2022-10-04 | Skyworks Solutions, Inc. | Systems and methods for load detection on serial communication data lines |
| CN114839909A (en) * | 2022-04-27 | 2022-08-02 | 烟台杰瑞石油服务集团股份有限公司 | Low-power-consumption control system and interaction method in low-power-consumption control system |
| CN115189718A (en) * | 2022-07-07 | 2022-10-14 | 深圳市帝拓电子有限公司 | Direct current power carrier type communication circuit and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001128314A (en) * | 1999-10-26 | 2001-05-11 | Denso Corp | Dual power source type load drive control circuit |
| US11226923B1 (en) * | 2020-11-18 | 2022-01-18 | Endress+Hauser SE+Co. KG | One wire power and bi-directional data interface for serial communication |
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