KLINE circuit built by least discrete devices

Abstract

The utility model relates to a KLINE circuit built by least discrete devices, and relates to the related field of air bag systems. The switching circuit comprises a first switching tube Q1 and a second switching tube Q2, an input end of the first switching tube Q1 is electrically connected to a power supply end VCC of the airbag system, an output end of the first switching tube Q1 is grounded, and the output end of the first switching tube Q1 is electrically connected to a serial port receiving end ISORX; the control end of the first switch tube Q1 is electrically connected to the input end of the second switch tube Q2 and the communication end K-LINE, the output end of the second switch tube Q2 is grounded, and the control end of the second switch tube Q2 is electrically connected to the serial port sending end ISOT. The method and the device have the effect of reducing the cost of KLINE communication.

Description

Technical Field

[0001] The present application relates to the related field of airbag system, and more particularly to a KLINE circuit constructed with minimum discrete components. Background Art

[0002] In recent years, with the rapid development of the automotive industry, the application of airbag systems has become more and more extensive. The KLINE communication chip in the airbag system, as a key component, bears the important responsibility of data transmission and communication. However, affected by the global chip shortage, the supply of KLINE communication chips for airbags is particularly tight, which undoubtedly brings considerable challenges to automobile manufacturing and related industries.

[0003] In the existing technology, low-speed communication chips based on KLINE usually adopt an integrated design solution. Although it can meet basic communication needs, the difficulty and cost of purchasing them have increased significantly in the context of chip shortage. Therefore, seeking an alternative solution to alleviate the chip shortage problem and reduce procurement costs has become an urgent problem to be solved in the industry. Utility Model Content

[0004] In order to reduce the cost of KLINE communication, the present application provides a KLINE circuit constructed with minimal discrete components.

[0005] The present application provides a KLINE circuit constructed with a minimum of discrete components using the following technical solutions:

[0006] A KLINE circuit is constructed with a minimum of discrete components, including a first switch tube Q1 and a second switch tube Q2, wherein the input end of the first switch tube Q1 is electrically connected to a power supply end VCC of an airbag system, the output end of the first switch tube Q1 is grounded, and the output end of the first switch tube Q1 is electrically connected to a serial port receiving end ISORX; the control end of the first switch tube Q1 is electrically connected to the input end of the second switch tube Q2 and a communication end K-LINE, the output end of the second switch tube Q2 is grounded, and the control end of the second switch tube Q2 is electrically connected to a serial port sending end ISOTX.

[0007] By adopting the above technical solution, when the host sends data, the communication terminal K-LINE outputs a low level, and the first switch tube Q1 is turned on, so that the voltage value of the serial port receiving terminal ISORX is pulled up to the voltage value of the power supply terminal VCC, and the serial port sending terminal ISOTX outputs a low level by default, and the second switch tube Q2 is in a cut-off state; when the node sends data, the serial port sending terminal ISOTX outputs a high level, so that the second switch tube Q2 is turned on, and the voltage value of the communication terminal K-LINE is pulled down to OV, thereby solving the problem of level inversion, without the need for additional hardware, saving costs, and thus minimizing hardware.

[0008] Preferably, a diode D1 is further included, wherein an anode of the diode is electrically connected to the control end of the first switch tube Q1 , and a cathode of the diode D1 is electrically connected to the input end of the second switch tube Q2 and the communication end K-LINE.

[0009] By adopting the above technical solution, the diode D1 is used to play an anti-reverse function, so as to avoid the control end of the first switch tube Q1 receiving a high level and causing it to be cut off.

[0010] Preferably, a common cathode diode Z1 is further included, a first anode of the common cathode diode Z1 is electrically connected to the communication terminal K-LINE, a second anode of the common cathode diode Z1 is grounded, and a cathode of the common cathode diode Z1 is suspended.

[0011] By adopting the above technical solution, the common cathode diode Z1 can play a voltage stabilizing role, thereby improving the reliability of the circuit.

[0012] Preferably, it further comprises a capacitor C1, one end of the capacitor C1 is electrically connected to the communication terminal K-LINE.

[0013] By adopting the above technical solution, the capacitor C1 is used for filtering, so that the reliability of the circuit can be further improved.

[0014] Preferably, the output end of the first switch tube Q1 is grounded through a resistor R1.

[0015] By adopting the above technical solution, the resistor R1 is used to divide the voltage, so that the serial port receiving end ISORX can receive a suitable voltage to ensure the normal operation of the single-chip microcomputer.

[0016] Preferably, the control end of the second switch tube Q2 is grounded through a resistor R2.

[0017] By adopting the above technical solution, the resistor R2 is used to divide the voltage, so that the control end of the second switch tube Q2 can receive a suitable voltage, thereby ensuring the normal operation of the second switch tube Q2.

[0018] Preferably, the first switch tube Q1 is configured as a PNP transistor, and the second switch tube Q2 is configured as an NPN transistor.

[0019] By adopting the above technical solution, the PNP transistor itself has a high voltage resistance, and the external voltage invasion can be effectively prevented by setting the PNP transistor; the frequency response of the NPN transistor is wide, and it can effectively respond to the signal output by the serial port sending end ISOTX.

[0020] Preferably, the first switch tube Q1 is configured as a band-stop transistor.

[0021] By adopting the above technical solution and setting a band-stop transistor, the components in the circuit can be reduced, thereby saving the cost of the circuit.

[0022] In summary, the present application includes at least one of the following beneficial technical effects: when the serial port transmitting end ISOTX outputs a high level, the communication end K-LINE receives a low level; when the communication end K-LINE outputs a low level, the serial port receiving end ISORX receives a high level, which solves the problem of level inversion, thereby eliminating the need for additional hardware and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a circuit diagram of an embodiment of the present application. DETAILED DESCRIPTION

[0024] The following is combined with Figure 1 This application is described in further detail.

[0025] The embodiment of the present application discloses a KLINE circuit constructed with a minimum of discrete components.

[0026] Reference Figure 1 A KLINE circuit constructed with a minimum number of discrete components includes a first switch tube Q1 and a second switch tube Q2, and in this embodiment, the first switch tube Q1 is set as a PNP triode, and the second switch tube Q2 is set as an NPN triode. The emitter of the first switch tube Q1 is electrically connected to the power supply terminal VCC of the airbag system, the collector of the first switch tube Q1 is grounded through a pull-down resistor R1, and the collector of the first switch tube Q1 is also electrically connected to the serial port receiving terminal ISORX. A diode D1 is arranged between the base of the first switch tube Q1 and the collector of the second switch tube Q2, and the anode of the diode D1 is electrically connected to the base of the first switch tube Q1. The cathode of the diode D1 is electrically connected to the collector of the second switch tube Q2, and the cathode of the diode D1 is electrically connected to the communication terminal K-LINE. The emitter of the second switch tube Q2 is grounded, and the base of the second switch tube Q2 is electrically connected to the serial port sending terminal ISOTX through a resistor R2. Preferably, the first switch tube Q1 is configured as a band-resistance transistor, which is formed by connecting one or two resistors and a transistor and then packaging them together, thereby reducing components in the circuit and thus saving the cost of the circuit.

[0027] When the host sends data, the voltage value of the communication terminal K-LINE is pulled down to about 0V. If the voltage value of the communication terminal K-LINE is pulled down to 0V, the base voltage of the first switch tube Q1 is pulled down through the diode D1, so that the first switch tube Q1 is in the on state, thereby raising the voltage value of the serial port receiving end ISORX to the voltage value of the power supply end VCC. When the host sends data, the serial port sending end ISOTX outputs a low level by default, and the base of the second switch tube Q2 passes through the resistor R2, and the second switch tube Q2 is in the off state.

[0028] When the node sends data, the serial port sending end ISOTX outputs a high level, thereby turning on the second switch tube Q2. At this time, the voltage value of the communication end K-LINE is pulled down to OV.

[0029] When the serial port sending end ISOTX outputs a high level, the communication end K-LINE receives a low level; when the communication end K-LINE outputs a low level, the serial port receiving end ISORX receives a high level.

[0030] Preferably, the embodiment of the present application further includes a common cathode diode Z1 and a capacitor C1, wherein the first anode of the common cathode diode Z1 is electrically connected to the cathode of the diode D1, the second anode of the common cathode diode Z1 is electrically connected to the ground, and the cathode of the common cathode diode Z1 is suspended. One end of the capacitor C1 is electrically connected to the cathode of the diode D1, and the other end of the capacitor C1 is grounded. By providing the common cathode diode Z1 and the capacitor C1, the voltage stabilization and filtering function can be realized, thereby improving the reliability of the circuit.

[0031] The implementation principle of the KLINE circuit constructed with a minimum of discrete components in the embodiment of the present application is: when the serial port transmitting end ISOTX outputs a high-level signal, the communication end K-LINE will receive a low-level signal accordingly; on the contrary, if the K-LINE end outputs a low-level signal, the serial port receiving end ISORX will receive a high-level signal. This design effectively solves the problem of level inversion, so that normal signal transmission can be achieved without the need to add additional hardware devices, thereby reducing costs.

[0032] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A KLINE circuit constructed with a minimum of discrete components, characterized in that: It includes a first switch tube Q1 and a second switch tube Q2, wherein the input end of the first switch tube Q1 is electrically connected to the power supply end VCC of the airbag system, the output end of the first switch tube Q1 is grounded, and the output end of the first switch tube Q1 is electrically connected to the serial port receiving end ISORX; the control end of the first switch tube Q1 is electrically connected to the input end and the communication end K-LINE of the second switch tube Q2, the output end of the second switch tube Q2 is grounded, and the control end of the second switch tube Q2 is electrically connected to the serial port sending end ISOTX.

2. A KLINE circuit constructed with a minimum number of discrete components according to claim 1, characterized in that: It also includes a diode D1, an anode of the diode is electrically connected to the control end of the first switch tube Q1, and a cathode of the diode D1 is electrically connected to the input end of the second switch tube Q2 and the communication end K-LINE.

3. The KLINE circuit constructed with a minimum number of discrete components according to claim 1, characterized in that: It also includes a common cathode diode Z1, a first anode of the common cathode diode Z1 is electrically connected to the communication terminal K-LINE, a second anode of the common cathode diode Z1 is grounded, and a cathode of the common cathode diode Z1 is suspended.

4. The KLINE circuit constructed with a minimum number of discrete components according to claim 1, characterized in that: The device further includes a capacitor C1 , one end of which is electrically connected to the communication terminal K-LINE.

5. The KLINE circuit constructed with a minimum number of discrete components according to claim 1, characterized in that: The output end of the first switch tube Q1 is grounded through a resistor R1.

6. The KLINE circuit constructed with a minimum number of discrete components according to claim 1, characterized in that: The control end of the second switch tube Q2 is grounded through a resistor R2.

7. The KLINE circuit constructed with a minimum number of discrete components according to claim 1, characterized in that: The first switch tube Q1 is configured as a PNP transistor, and the second switch tube Q2 is configured as an NPN transistor.

8. A KLINE circuit constructed with a minimum number of discrete components according to claim 1 or 7, characterized in that: The first switch tube Q1 is configured as a band-stop transistor.

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