Sleep wake-up circuit based on a can communication network

Abstract

The application discloses a kind of dormancy wake-up circuit based on CAN communication network, including: CAN communication circuit and trigger circuit, trigger circuit includes: power supply chip U1, MOS tube Q6, triode Q7, resistance R77 and resistance R78, the 7 pin of CAN interface chip U10 of CAN communication circuit is connected with one end of resistance R78, the other end of resistance R78 is connected with the 1 pin of triode Q7, the 2 pin of triode Q7 is grounded, trigger power supply is simultaneously connected with the 1 pin of MOS tube Q6, 2 pin and one end of resistance R77, the other end of resistance R77 is connected with the 3 pin of triode Q7, the 3 pin of MOS tube Q6 is connected with the 1 pin of power supply chip U1, the 3 pin of power supply chip U1 is connected with controller power supply, the 2 pin and 4 pin of power supply chip U1 are all grounded.The dormancy wake-up circuit of the application controls the dormancy and wake-up operation of ECU by the specific frame of CAN communication circuit, reduces the power consumption of automobile ECU, while guaranteeing that node can quickly and reliably wake up communication when needed.

Description

Technical Field

[0001] This utility model relates to a sleep / wake-up circuit, and more particularly to a sleep / wake-up circuit based on a CAN communication network. Background Technology

[0002] CAN communication network is a real-time communication system based on CAN bus technology. It has high-speed data transmission and reliable fault detection capabilities. The ECU (Electronic Control Unit) of a car can realize data acquisition and command transmission through the CAN bus.

[0003] Traditional gasoline-powered vehicles have an electronic and electrical architecture centered on "distributed ECUs," with the CAN bus used only for communication with a few critical systems. Their sleep strategies are relatively simple, such as shutting down unnecessary ECUs after the ignition is turned off. However, the electronic and electrical architecture of new energy vehicles is evolving towards a "domain-centralized" architecture, including powertrain, chassis, and smart cockpit domains. The CAN bus needs to connect more cross-domain nodes and support cross-domain collaborative sleep. For example, when the powertrain domain is in sleep mode, the smart cockpit domain can maintain some functions in standby mode. This requires the sleep / wake-up circuit to have stronger coordination and selection capabilities.

[0004] Currently, some existing technologies control the power supply through vehicle relays, which requires additional relays at the power supply end, resulting in higher costs. Other existing technologies achieve low-power wake-up by setting an inverting circuit module on the RX pin of the CAN interface chip (such as the low-power wake-up circuit using the RX pin of the CAN interface chip disclosed in Chinese Utility Model CN222157381U), but this circuit is prone to false triggering or missed wake-up. Utility Model Content

[0005] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this utility model is to design a sleep-wake circuit based on CAN communication network, reduce the power consumption of the car ECU, and at the same time ensure that the node can quickly and reliably wake up the communication when needed.

[0006] To achieve the above objectives, this utility model provides a sleep / wake-up circuit based on a CAN communication network, comprising: a CAN communication circuit and a trigger circuit. The CAN communication circuit includes: a CAN interface chip U10, a common-mode inductor LF4, resistors R68, R69, and R83. CAN-H and CAN-L pins of a CAN bus are connected to pins 3 and 4 of the common-mode inductor, respectively. Pins 1 and 2 of the common-mode inductor are connected to pins 12 and 13 of the CAN interface chip U10, respectively. One end of resistor R83 is connected to pin 14 of the CAN interface chip U10, and one end of resistor R68 is connected to pin 9 of the CAN interface chip U10. A controller power supply is simultaneously connected to pins 3 and 5 of the CAN interface chip U10. Pin 2 is grounded. Pin 7 of the CAN interface chip U10 is connected to one end of resistor R69, and the other end of resistor R69 is grounded. The trigger circuit includes a power chip U1, a MOSFET Q6, a transistor Q7, resistors R77 and R78. Pin 7 of the CAN interface chip U10 is connected to one end of resistor R78, and the other end of resistor R78 is connected to pin 1 of transistor Q7. Pin 2 of transistor Q7 is grounded. A trigger power supply is simultaneously connected to pins 1 and 2 of MOSFET Q6 and one end of resistor R77. The other end of resistor R77 is connected to pin 3 of transistor Q7. Pin 3 of MOSFET Q6 is connected to pin 1 of power chip U1. Pin 3 of power chip U1 is connected to the controller power supply. Pins 2 and 4 of power chip U1 are both grounded. Because the trigger circuit uses MOSFET Q6 and transistor Q7 to simultaneously control the on / off state of the CAN interface chip U10, it ensures that the node can quickly and reliably wake up communication when needed.

[0007] Furthermore, the CAN communication circuit also includes a transient voltage suppressor diode (TVS2). The CAN-H and CAN-L pins of the CAN bus are connected to pins 1 and 2 of the TVS2, respectively, and pin 3 of the TVS2 is grounded. Because the CAN communication circuit includes the TVS2, it can protect the CAN interface chip U10 from damage caused by surge pulses.

[0008] Furthermore, the CAN communication circuit also includes capacitors C71 and C72. The CAN-H and CAN-L terminals of the CAN bus are connected to one end of capacitor C72 and one end of capacitor C71, respectively. The other ends of capacitors C72 and C71 are both grounded. The use of capacitors C71 and C72 allows for filtering of the data transmitted via the CAN bus.

[0009] Furthermore, the CAN communication circuit also includes resistors R49 and R50, and capacitor C70. The CAN-H and CAN-L terminals of the CAN bus are connected to one end of resistor R49 and one end of resistor R50, respectively. The other ends of resistors R49 and R50 are both connected to one end of capacitor C70, and the other end of capacitor C70 is grounded. The use of resistors R49 and R50, and capacitor C70, can eliminate CAN signal reflection and improve the CAN anti-interference capability.

[0010] Furthermore, the CAN communication circuit also includes a resistor R84 and a capacitor C8. Pin 9 of the CAN interface chip U10 is connected to one end of both resistor R84 and capacitor C8, and the other ends of both resistor R84 and capacitor C8 are grounded. Connecting resistor R84 and capacitor C8 in parallel allows for filtering of the signal transmitted to pin 9 of the CAN interface chip U10.

[0011] Furthermore, the CAN communication circuit also includes capacitors C47 and C49. The controller power supply is connected to one end of both capacitor C47 and one end of capacitor C49, and the other ends of both capacitors C47 and C49 are grounded. The inclusion of capacitors C47 and C49 allows for further filtering of the power transmitted from the controller power supply.

[0012] Furthermore, the trigger circuit also includes a resistor R72 and a capacitor C23. The resistor R78 is connected to one end of both the resistor R72 and the capacitor C23, and the other ends of both the resistor R72 and the capacitor C23 are grounded. The parallel connection of the resistor R72 and the capacitor C23 filters the signal from pin 7 of the CAN interface chip U10.

[0013] Furthermore, the trigger circuit also includes a capacitor C10 and a resistor R17. The trigger power supply is connected to one end of both capacitor C10 and resistor R17, and the other ends of both capacitor C10 and resistor R17 are connected to pin 2 of MOSFET Q6. The use of capacitor C10 and resistor R17 filters the signal transmitted by the trigger power supply.

[0014] Furthermore, the trigger circuit also includes capacitors C1 and C2. Pin 3 of the MOSFET Q6 is connected to one end of both capacitor C1 and one end of capacitor C2, and the other ends of both capacitors C1 and C2 are grounded. The use of capacitors C1 and C2 filters the signal transmitted to pin 1 of the power chip U1.

[0015] Furthermore, the trigger circuit also includes capacitors C25 and C58. Pin 3 of the power chip U1 is connected to one end of capacitor C25 and one end of capacitor C58, and the other ends of capacitors C25 and C58 are both grounded. The use of capacitors C25 and C58 allows for filtering of the signal transmitted through pin 3 of the power chip U1. Attached Figure Description

[0016] Figure 1 This utility model relates to a CAN communication circuit; Figure 2 This is the trigger circuit involved in this utility model. Detailed Implementation

[0017] The technical solution of this utility model will be further described below through embodiments: This invention provides a sleep / wake-up circuit based on a CAN communication network, comprising: a CAN communication circuit and a trigger circuit. The CAN communication circuit is connected to the trigger circuit and to an MCU (Microcontroller Unit). The trigger circuit is connected to a controller power supply, and the controller power supply is connected to both the CAN communication circuit and the MCU. When the sleep / wake-up circuit is operating, the CAN communication circuit communicates with the ECU's MCU via SPI. Simultaneously, the CAN communication circuit transmits a trigger signal to the trigger circuit. The trigger circuit controls the power supply's on / off state based on the trigger signal, thereby controlling whether to supply power to the MCU. This allows the MCU to control the ECU's sleep and wake-up operations.

[0018] Specifically, such as Figure 1As shown, the CAN communication circuit includes: a CAN interface chip U10, a common-mode inductor LF4, a transient voltage suppressor diode TVS2, resistors R49, R50, R68, R69, R83, and R84, and capacitors C8, C47, C49, C70, C71, and C72. The CAN bus pins CAN-H and CAN-L are connected to pins 3 and 4 of the common-mode inductor LF4, respectively. Pins 1 and 2 of the common-mode inductor LF4 are connected to pins 12 (CANH) and 13 (CANL) of the CAN interface chip U10, respectively. The CAN bus pins CAN-H and CAN-L are connected to pins 1 and 2 of the transient voltage suppressor diode TVS2, respectively. Pin 3 of the transient voltage suppressor diode TVS2 is grounded. The CAN bus's CAN-H and CAN-L pins are connected to one end of capacitor C72 and one end of capacitor C71, respectively. The other ends of capacitors C72 and C71 are both grounded. The CAN bus's CAN-H and CAN-L pins are connected to one end of resistor R49 and one end of resistor R50, respectively. The other ends of resistors R49 and R50 are both connected to one end of capacitor C70, which is grounded. One end of resistor R83 is connected to pin 14 (SCSN) of CAN interface chip U10. One end of resistor R68 is simultaneously connected to pin 9 (WAKE) of CAN interface chip U10. One end of resistor R84 is connected to one end of capacitor C8. The other end of resistor R68 and pin 10 of CAN interface chip U10 are both connected to DC power lines. With the INPUT connection, pin 1 (CAN TX) and pin 4 (CAN RX) of the CAN interface chip U10 are connected to the TX and RX lines respectively. The other end of resistor R84 and the other end of capacitor C8 are grounded. The controller power supply is connected to one end of capacitor C47, one end of capacitor C49, and pin 3 (VCC) and pin 5 (VIO) of the CAN interface chip U10. Pin 2 (GND) of the CAN interface chip U10, the other end of capacitor C47, and the other end of capacitor C49 are grounded. Pin 6 (SDO) of the CAN interface chip U10 is left floating. Pin 7 (IN-H) of the CAN interface chip U10 is connected to the trigger circuit and one end of resistor R69. The other end of resistor R69 is grounded.When the CAN communication circuit is working, the high-order and low-order data transmitted by CAN-H and CAN-L of the CAN bus are transformed by the common-mode inductor LF4 and then transmitted to pins 12 (CANH) and 13 (CANL) of the CAN interface chip U10. Transient voltage suppressor diode TVS2 protects the CAN interface chip U10 from surge pulse damage. Capacitors C71 and C72 are used for filtering. Resistors R49, R50, and capacitor C70 are used to eliminate CAN signal reflection. SCSN data is transmitted to pin 14 (SCSN) of the CAN interface chip U10 after passing through resistor R83. SDI data is transmitted to pin 11 (SDI) of the CAN interface chip U10. The car battery transmits DC power to pin 12 (BAT) of the CAN interface chip U10. This DC power is transmitted through resistor R68 to pin 9 (WAKE) of the CAN interface chip U10, thus waking up the CAN interface chip U10. Resistor R84 and capacitor C8 are connected in parallel for filtering. Pins 1 (CAN TX) and 4 (CAN) of the CAN interface chip U10... RX is used to output TX and RX signals respectively. Pin 2 of CAN interface chip U10 is grounded (GND). Pin 3 of CAN interface chip U10 (VCC) receives 5V power from the controller. Pin 5 of CAN interface chip U10 (VIO) is used to set the logic levels of the input and output pins. Capacitors C47 and C49 are connected in parallel for filtering. Pin 7 of CAN interface chip U10 (IN-H) transmits the signal to the trigger circuit. Resistor R69 is used for current shunting.

[0019] Specifically, such as Figure 2As shown, the trigger circuit includes: power supply chip U1, MOSFET Q6, transistor Q7, resistors R17, R72, R77, R78, capacitors C1, C2, C10, C23, C25, and C58. Pin 7 (IN-H) of the CAN interface chip U10 is connected to one end of resistor R78. The other end of resistor R78 is simultaneously connected to pin 1 (G terminal) of transistor Q7, one end of resistor R72, and one end of capacitor C23. Pin 2 (C terminal) of transistor Q7, the other end of resistor R72, and the other end of capacitor C23 are all grounded. The trigger power supply VIN is simultaneously connected to one end of capacitor C10, one end of resistor R17, and MOSFET Q6. Pin 1 (G terminal) of MOSFET Q6 is connected to one end of resistor R77. The other end of resistor R77 is connected to pin 3 (E terminal) of MOSFET Q7. The other end of capacitor C10 and the other end of resistor R17 are both connected to pin 2 (S terminal) of MOSFET Q6. Pin 3 (D terminal) of MOSFET Q6 is simultaneously connected to pin 1 (IN) of power chip U1, one end of capacitor C1, and one end of capacitor C2. Pin 3 (OUT) of power chip U1 is simultaneously connected to the controller power supply, one end of capacitor C25, and one end of capacitor C58. The other ends of capacitor C1, capacitor C2, pins 2 and 4 (GND) of power chip U1, and the other ends of capacitors C25 and C58 are all grounded. When the trigger circuit is working, pin 7 (IN-H) of the CAN interface chip U10 transmits a trigger signal to pin 1 (G) of transistor Q7 via resistor R78. When the trigger signal is low, MOSFET Q6 is not turned on, thus causing transistor Q7 to turn off, which in turn cuts off the power supply to the controller through power chip U1, ultimately causing the MCU to enter sleep mode. When the trigger signal is high, MOSFET Q6 turns on, which in turn turns on transistor Q7, which in turn supplies power to the controller through power chip U1, ultimately waking up the MCU. In the above process, resistor R78 is used for voltage division, and resistors R72 and C23 in parallel, capacitor C10 and R17 in parallel are used for filtering, as are capacitors C1 and C2 in parallel, and capacitors C25 and C58 in parallel, all for filtering. In addition, resistor R70 is unmounted, and its two ends are connected to pin 2 (S) and pin 3 (D) of MOSFET Q6, respectively.

[0020] The above-mentioned sleep / wake-up circuit based on CAN communication network has the following advantages: 1. Ultra-low static power consumption, improving driving range: In traditional new energy vehicles, CAN bus nodes, such as instrument panel, audio, and air conditioning controllers, may remain in a "semi-active" state after the engine is turned off, waiting for button input, resulting in static current as high as hundreds of milliamps. The sleep / wake-up circuit of this invention can put unnecessary nodes into deep sleep mode, reducing the sleep current to tens of microamps.

[0021] 2. Dynamic power distribution reduces system costs: The "on-demand power supply" strategy of the sleep-wake circuit eliminates the need to configure independent low-voltage batteries for all nodes, reducing unnecessary power supply design and lowering wiring harness complexity and cost.

[0022] 3. Improve communication reliability: As the "nerve center" of new energy vehicles, the CAN bus needs to support both low-power sleep and high-reliability wake-up. The sleep and wake-up circuit controls the power supply by setting MOSFET Q6 and transistor Q7 to avoid communication failures caused by false triggering or missed wake-up. It can support specific frame wake-up and efficient sleep.

Claims

1. A sleep / wake-up circuit based on a CAN communication network, comprising: The CAN communication circuit and trigger circuit are characterized by: The CAN communication circuit includes: a CAN interface chip U10, a common-mode inductor LF4, resistors R68, R69, and R83. CAN-H and CAN-L of a CAN bus are connected to pins 3 and 4 of the common-mode inductor, respectively. Pins 1 and 2 of the common-mode inductor are connected to pins 12 and 13 of the CAN interface chip U10, respectively. One end of resistor R83 is connected to pin 14 of the CAN interface chip U10. One end of resistor R68 is connected to pin 9 of the CAN interface chip U10. A controller power supply is connected to pins 3 and 5 of the CAN interface chip U10. Pin 2 of the CAN interface chip U10 is grounded. Pin 7 of the CAN interface chip U10 is connected to one end of resistor R69, and the other end of resistor R69 is grounded. The trigger circuit includes: a power chip U1, a MOSFET Q6, a transistor Q7, a resistor R77, and a resistor R78. Pin 7 of the CAN interface chip U10 is connected to one end of the resistor R78, and the other end of the resistor R78 is connected to pin 1 of the transistor Q7. Pin 2 of the transistor Q7 is grounded. A trigger power supply is simultaneously connected to pins 1 and 2 of the MOSFET Q6 and one end of the resistor R77. The other end of the resistor R77 is connected to pin 3 of the transistor Q7. Pin 3 of the MOSFET Q6 is connected to pin 1 of the power chip U1. Pin 3 of the power chip U1 is connected to the controller power supply. Pins 2 and 4 of the power chip U1 are both grounded.

2. The sleep / wake-up circuit based on a CAN communication network according to claim 1, characterized in that: The CAN communication circuit also includes a transient voltage suppressor diode TVS2. The CAN-H and CAN-L of the CAN bus are connected to pins 1 and 2 of the transient voltage suppressor diode TVS2, respectively, and pin 3 of the transient voltage suppressor diode TVS2 is grounded.

3. The sleep / wake-up circuit based on a CAN communication network according to claim 1, characterized in that: The CAN communication circuit also includes capacitors C71 and C72. The CAN-H and CAN-L of the CAN bus are respectively connected to one end of capacitor C72 and one end of capacitor C71. The other ends of capacitors C72 and C71 are both grounded.

4. The sleep / wake-up circuit based on a CAN communication network according to claim 1, characterized in that: The CAN communication circuit also includes: resistor R49, resistor R50 and capacitor C70. CAN-H and CAN-L of the CAN bus are respectively connected to one end of resistor R49 and one end of resistor R50. The other end of resistor R49 and the other end of resistor R50 are both connected to one end of capacitor C70. The other end of capacitor C70 is grounded.

5. The sleep / wake-up circuit based on a CAN communication network according to claim 1, characterized in that: The CAN communication circuit also includes a resistor R84 and a capacitor C8. Pin 9 of the CAN interface chip U10 is connected to one end of the resistor R84 and one end of the capacitor C8. The other ends of the resistor R84 and the other ends of the capacitor C8 are grounded.

6. The sleep / wake-up circuit based on a CAN communication network according to claim 1, characterized in that: The CAN communication circuit also includes capacitor C47 and capacitor C49. The controller power supply is connected to one end of capacitor C47 and one end of capacitor C49. The other ends of capacitor C47 and capacitor C49 are both grounded.

7. The sleep / wake-up circuit based on a CAN communication network according to claim 1, characterized in that: The trigger circuit also includes a resistor R72 and a capacitor C23. The resistor R78 is connected to one end of the resistor R72 and one end of the capacitor C23. The other end of the resistor R72 and the other end of the capacitor C23 are both grounded.

8. The sleep / wake-up circuit based on a CAN communication network according to claim 1, characterized in that: The trigger circuit also includes a capacitor C10 and a resistor R17. The trigger power supply is connected to one end of the capacitor C10 and one end of the resistor R17. The other end of the capacitor C10 and the other end of the resistor R17 are both connected to pin 2 of the MOSFET Q6.

9. The sleep / wake-up circuit based on a CAN communication network according to claim 1, characterized in that: The trigger circuit also includes capacitors C1 and C2. Pin 3 of the MOS transistor Q6 is connected to one end of capacitor C1 and one end of capacitor C2. The other ends of capacitors C1 and C2 are both grounded.

10. The sleep / wake-up circuit based on a CAN communication network according to claim 1, characterized in that: The trigger circuit also includes capacitor C25 and capacitor C58. Pin 3 of the power chip U1 is connected to one end of capacitor C25 and one end of capacitor C58. The other ends of capacitor C25 and capacitor C58 are both grounded.

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