Circuit capable of realizing bidirectional communication and power supply

Abstract

The utility model discloses a circuit capable of realizing bidirectional communication and power supply. The circuit comprises a power supply / signal wire (L1), a ground wire (L0), a diode (D1), a first capacitor (C1), a second capacitor (C2), a triode (Q1), a first resistor (R1) and a second resistor (R2), the power supply / signal line (L1) is grounded through the first resistor (R1); one end of the diode (D1) is connected with the power supply / signal line (L1), and the other end of the diode (D1) is connected with the ground wire (L0) through the first capacitor (C1); the second capacitor (C2) is connected in parallel with the first capacitor (C1); the drain electrode of the triode (Q1) is connected with the power supply / signal line (L1), and the grid electrode of the triode (Q1) is connected with the transmitting end of the MCU on the power receiving circuit board through the second resistor (R2); and the source electrode of the triode (Q1) is grounded. By adopting the circuit of the utility model, both power supply and digital communication can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, and in particular to a circuit capable of realizing bidirectional communication and power supply. Background Art

[0002] The power supply and communication between electronic circuit boards require the connection of multiple wires, such as two wires (power line VCC and ground line GND) for power supply. Three wires (transmission line TX, receiving line RX and ground line GND) are used for full-duplex communication or two wires (transmission line TX / receiving line RX and ground line GND) are used for half-duplex communication. Therefore, about 4 to 5 wires are required between two circuit boards. In the prior art, considering that communication and power supply share the same ground, and half-duplex communication is adopted, at least 3 wires are required.

[0003] However, there are only two metal connections between the blade head and the handle of the ultrasonic soft tissue cutting hemostat that can be used to transmit electrical signals, that is, there are only two wires. In the prior art, only these two wires can be used to read key signals, and digital communication cannot be achieved.

[0004] Specifically, the existing technical solutions are as follows Figure 1 The circuit in the cutter head is shown in the figure. It is composed of two diodes and two buttons. The button status is read through the positive and negative alternating signals. The handle circuit only needs to provide the alternating high and low levels of the two electrical signals A1 and A2, and then read the level difference between A1 and A2 to identify the button.

[0005] Networks A1 and A2 change to high level and low level alternately, that is, if the current state is that A1 is high level and A2 is low level, the next state changes to A1 is low level and A2 is high level, and this is repeated.

[0006] When A1 is at a high level and A2 is at a low level, if the switch S1 is pressed, the diode D1 is forward connected, the diode D1 is turned on, and the voltage difference between A1 and A2 is equal to the conduction voltage drop of the diode; if the switch S2 is pressed, the diode D2 is reversed, the diode D2 is not turned on, and the level values ​​of A1 and A2 are not affected.

[0007] When A1 is at a low level and A2 is at a high level, if the switch S1 is pressed, the diode D1 is reversed, the diode D1 is not turned on, and the level values ​​of A1 and A2 are not affected; if the switch S2 is pressed, the diode D2 is forward connected, the diode D2 is turned on, and the voltage difference between A1 and A2 is equal to the conduction voltage drop of the diode.

[0008] This solution can only be used to identify the status of buttons, but cannot be used for communication between MCUs.

[0009] How to solve the technical problem that the circuit in the prior art can realize both power supply and digital communication is a technical problem that urgently needs to be solved. Utility Model Content

[0010] The technical problem to be solved by the utility model is to solve the circuit technical problem that the prior art cannot realize both power supply and digital communication.

[0011] In order to solve the above technical problems, the technical solutions provided by the utility model are as follows:

[0012] A circuit capable of realizing bidirectional communication and power supply, characterized in that it comprises a power supply / signal line (L1) and a ground line (L0), a diode (D1), a first capacitor (C1), a second capacitor (C2), a transistor (Q1), a first resistor (R1), and a second resistor (R2);

[0013] The power supply / signal line (L1) is grounded through the first resistor (R1);

[0014] One end of the diode (D1) is connected to the power supply / signal line (L1), and the diode (D1)

[0015] The other end is connected to the ground line (L0) through the first capacitor (C1);

[0016] The second capacitor (C2) is connected in parallel with the first capacitor (C1);

[0017] The drain of the transistor (Q1) is connected to the power supply / signal line (L1), and the transistor (Q1)

[0018] The gate is connected to the transmitting end of the MCU on the power receiving circuit board through the second resistor (R2);

[0019] The source of the transistor (Q1) is grounded.

[0020] Furthermore, when the power receiving circuit board is in a non-communication state, the power supply / signal line (L1) is at a high level relative to the ground line (L0), and the power supply / signal line (L1) supplies power to the power receiving circuit board through the diode (D1).

[0021] Furthermore, when the power receiving circuit board is in a communication state, the power supply / signal line (L1) continuously changes the level value according to the communication data;

[0022] When the power supply / signal line (L1) is at a high level, the receiving end (RX) of the power receiving circuit board is at a high level;

[0023] When the power supply / signal line (L1) is at a low level, the receiving end (RX) of the power receiving circuit board is at a low level.

[0024] Further, when the powered circuit board sends data, the transmitting end (TX) of the powered circuit board continuously changes the level value according to the sent data;

[0025] When the transmitting end (TX) of the power receiving circuit board is at a high level, the power supply / signal line (L1) is pulled low;

[0026] When the transmitting end (TX) of the power receiving circuit board is at a low level, the power supply / signal line (L1) is pulled high.

[0027] Furthermore, when the power supply / signal line (L1) is at a low level, power cannot be provided to the VIN; when the power supply / signal line (L1) is at a high level, power is provided to the VIN.

[0028] Furthermore, the triode (Q1) is a transistor or a field effect transistor.

[0029] Furthermore, the diode is a rectifier diode or a Schottky diode or a light emitting diode.

[0030] Furthermore, the capacitor is a non-polar capacitor.

[0031] Furthermore, the capacitor is a polarized capacitor.

[0032] After adopting such a design, the utility model has at least the following advantages:

[0033] (1) The circuit design of the utility model uses a small number of buses, which can realize both power supply and digital communication.

[0034] (2) The utility model has a simple structure, good effect, low cost and easy process implementation. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0036] Figure 1 It is a circuit diagram of two wires identifying two buttons in the prior art;

[0037] Figure 2 This is a circuit for realizing power supply and bidirectional communication using two wires in one embodiment of the utility model; DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] like Figure 2 As shown, an embodiment of the utility model provides a circuit capable of realizing bidirectional communication and power supply, including two wires, a power supply / signal line L1 and a ground line L0, VIN is a voltage terminal for powering a powered circuit board, RX is a receiving terminal of an MCU on the powered circuit board for asynchronous communication, and a low level is valid, and TX is a transmitting terminal of the MCU on the powered circuit board, and a high level is valid.

[0040] Specifically, a circuit capable of realizing bidirectional communication and power supply includes a power supply / signal line L1 and a ground line L0, a diode D1, a first capacitor C1, a second capacitor C2, a transistor Q1, a first resistor R1, and a second resistor R2;

[0041] The power supply / signal line L1 is grounded through a first resistor R1;

[0042] One end of the diode D1 is connected to the power supply / signal line L1, and the other end of the diode D1 is connected to the ground line L0 through the first capacitor C1;

[0043] The second capacitor C2 is connected in parallel with the first capacitor C1;

[0044] The drain of transistor Q1 is connected to the power supply / signal line L1, the gate of transistor Q1 inputs a signal to the TX transmitting end through the second resistor R2, and the source of transistor Q1 is grounded;

[0045] When the receiving circuit board is in a non-communication state, the power supply / signal line L1 end is at a high level relative to the ground line L0 end, and the power supply / signal line L1 end supplies power to the receiving circuit board through the diode D1. The RX end is at a high level, the asynchronous serial receiving module of the MCU works but does not receive data, the asynchronous serial transmitting module of the MCU is in a non-transmitting state, and the TX end is at a low level. When the receiving circuit board receives data and is in a communication state, the power supply / signal line L1 end continuously changes the level value according to the communication data.

[0046] When the power supply / signal line L1 is at a high level, the L1 terminal pulls up the RX terminal to a high level;

[0047] When the power supply / signal line L1 end is at a low level, the RX end also becomes a low level;

[0048] The MCU reads the data of the bus in an asynchronous serial manner. At this time, the TX terminal maintains a low level. When the L1 terminal is at a low level, it cannot provide power to the VI N terminal. At this time, the powered circuit board is powered by the energy storage first capacitor C1 and the second capacitor C2. When the L1 terminal is at a high level, the L1 terminal supplies power to the VI N terminal and charges the first capacitor C1 and the second capacitor C2.

[0049] When the powered circuit board sends data, the TX end continuously changes the level value according to the sent data.

[0050] When TX is at a high level, pins 3 and 2 of transistor Q1 are turned on, and L1 is pulled low; when TX is at a low level, pins 3 and 2 of Q1 are not turned on, and L1 is pulled high by the driver end, thereby flipping the level state of TX and sending L1. At this time, RX will also receive the data on L1. MCU can directly discard these data or turn off the receiving function before sending data. When L1 is at a low level, it cannot provide power to VIN. At this time, the power receiving circuit board is powered by the energy storage capacitor first capacitor C1 and second capacitor C2; when L1 is at a high level, L1 supplies power to VIN and charges the first capacitor C1 and second capacitor C2. To ensure the reliability of data transmission, the current sinking ability of Q1 should be higher than the current sourcing ability of the driver end of L1.

[0051] The triode (Q1) in the embodiment of the utility model can be a transistor or a field effect transistor.

[0052] The diode in the embodiment of the utility model can be a rectifier diode or a Schottky diode or a light emitting diode.

[0053] The capacitor in the embodiment of the utility model is a non-polar capacitor, and can also be a polar capacitor.

[0054] The effect of the embodiment of the utility model is to supply power from one circuit board to another circuit board and realize two-way communication at the same time, using only two wires.

[0055] After considering the utility model disclosed in the specification and examples, those skilled in the art will easily think of other embodiments of the utility model. This application is intended to cover any modification, use or adaptation of the utility model, which follows the general principles of the utility model and includes common knowledge or customary technical means in the art that are not disclosed in the utility model. The specification and examples are to be regarded as exemplary only, and the true scope and spirit of the utility model are indicated by the following claims.

[0056] It should be understood that the present invention is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A circuit capable of realizing bidirectional communication and power supply, characterized in that: It includes a power supply / signal line (L1) and a ground line (L0), a diode (D1), a first capacitor (C1), a second capacitor (C2), a transistor (Q1), a first resistor (R1), and a second resistor (R2); The power supply / signal line (L1) is grounded through the first resistor (R1); One end of the diode (D1) is connected to the power supply / signal line (L1), and the other end of the diode (D1) is connected to the ground line (L0) via the first capacitor (C1); The second capacitor (C2) is connected in parallel with the first capacitor (C1); The drain of the transistor (Q1) is connected to the power supply / signal line (L1), and the gate of the transistor (Q1) is connected to the sending end of the MCU on the power receiving circuit board through the second resistor (R2); The source of the transistor (Q1) is grounded.

2. A circuit capable of realizing bidirectional communication and power supply as claimed in claim 1, characterized in that: When the power receiving circuit board is in a non-communication state, the power supply / signal line (L1) is at a high level relative to the ground line (L0), and the power supply / signal line (L1) supplies power to the power receiving circuit board through the diode (D1).

3. A circuit capable of realizing bidirectional communication and power supply as claimed in claim 2, characterized in that: When the power receiving circuit board is in a communication state, the power supply / signal line (L1) continuously changes the level value according to the communication data; When the power supply / signal line (L1) is at a high level, the receiving end (RX) of the power receiving circuit board is at a high level; When the power supply / signal line (L1) is at a low level, the receiving end (RX) of the power receiving circuit board is at a low level.

4. A circuit capable of realizing bidirectional communication and power supply as claimed in claim 3, characterized in that: When the power receiving circuit board sends data, the power receiving circuit board transmitting end (TX) continuously changes the level value according to the sent data; When the transmitting end (TX) of the power receiving circuit board is at a high level, the power supply / signal line (L1) is pulled low; When the transmitting end (TX) of the power receiving circuit board is at a low level, the power supply / signal line (L1) is pulled high.

5. A circuit capable of realizing bidirectional communication and power supply as claimed in claim 4, characterized in that: When the power supply / signal line (L1) is at a low level, the VIN terminal cannot be powered; When the power supply / signal line (L1) is at a high level, power is supplied to the VIN terminal.

6. A circuit capable of realizing bidirectional communication and power supply as claimed in claim 1, characterized in that: The triode (Q1) is a transistor or a field effect transistor.

7. A circuit capable of realizing bidirectional communication and power supply as claimed in claim 1, characterized in that: The diode is a rectifier diode or a Schottky diode or a light emitting diode.

8. A circuit capable of realizing bidirectional communication and power supply as claimed in claim 1, characterized in that: The capacitor is a non-polar capacitor.

9. A circuit capable of realizing bidirectional communication and power supply as claimed in claim 1, characterized in that: The capacitor is a polarized capacitor.

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