A multi-path wake-up circuit
By designing a multi-path wake-up circuit and using a combination of voltage divider circuits and transistors, the problems of complex structure and large leakage current in ECU wake-up circuits under multiple wake-up source scenarios are solved, achieving a simple, low-cost and stable wake-up effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- IRIDIUM ELECTRONIC TECH (SHANGHAI) CO LTD
- Filing Date
- 2025-08-19
- Publication Date
- 2026-07-07
AI Technical Summary
Existing vehicle electronic control unit (ECU) wake-up circuits suffer from complex structures, high costs, and large leakage current when supporting multiple independent wake-up sources.
Design a multi-path wake-up circuit, which uses a voltage divider circuit consisting of a hard-wired wake-up signal, an internal wake-up hold signal, a Gsensor wake-up signal, a CAN wake-up signal, a bidirectional diode TVS1, a voltage divider resistor, and a Schottky diode. Transistors Q1 and Q2 are used to achieve reasonable distribution and filtering of the wake-up signal to ensure no interference between wake-up sources.
A simple structure, low cost, and no leakage current were achieved for the multi-path wake-up circuit. There is no interference between wake-up sources, and the circuit is stable and reliable.
Smart Images
Figure CN224473302U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an in-vehicle electronic control unit, specifically to a multi-path wake-up circuit. Background Technology
[0002] As a core component of modern automobiles, the stability and reliability of the Electronic Control Unit (ECU) are paramount. To ensure the ECU can be reliably activated by specific events (such as ignition signals, CAN bus signals, network wake-up signals, and sensor signals) while the vehicle is in sleep mode, the design of the wake-up circuit is one of the key technologies. For applications requiring support for multiple independent wake-up sources, designing an efficient, reliable, and cost-effective wake-up circuit remains a challenge. Current solutions suffer from complex structures, high costs, and significant leakage current. Utility Model Content
[0003] To address the problems existing in the prior art, this utility model provides a multi-path wake-up circuit that supports multiple wake-up sources. The wake-up sources are ORed with each other, so as long as one of them is sufficient to wake up the device, there will be no interference between the wake-up sources.
[0004] The technical solution of this utility model is: a multi-path wake-up circuit, including a hard-wired wake-up signal, an internal wake-up hold signal, a Gsensor wake-up signal, a CAN wake-up signal, a bidirectional diode TVS1, a voltage divider circuit composed of voltage divider resistors R1 and R2, a Schottky diode D1, a Schottky diode D2, a Schottky diode D3, a Schottky diode D4, a resistor R5, a capacitor C2, a transistor Q1, a resistor R6, a transistor Q2, a resistor R7, a voltage divider circuit composed of voltage divider resistors R3 and R4, and a capacitor C1;
[0005] The hard-wire wake-up signal is connected to one end of the bidirectional diode TVS1, and the other end of the bidirectional diode TVS1 is grounded for surge absorption.
[0006] The hard-wire wake-up signal from the bidirectional diode TVS1 is divided by the voltage divider circuit composed of voltage divider resistors R1 and R2 and then sent to the positive terminal of the Schottky diode D4.
[0007] The internal wake-up hold signal is connected to the positive terminal of the Schottky diode D1, the Gsensor wake-up signal is connected to the positive terminal of the Schottky diode D2, the CAN wake-up signal is connected to the positive terminal of the Schottky diode D3, and the negative terminals of the Schottky diodes D1, D2, D3, and D4 are connected together and then connected to one end of the resistor R5.
[0008] The other end of resistor R5 is divided into two paths: one path is connected to one end of capacitor C2, and the other end of capacitor C2 is grounded for filtering; the other end is connected to the base of transistor Q1, the emitter of transistor Q1 is grounded, the collector of transistor Q1 is connected to the base of transistor Q2 through resistor R6, the emitter of transistor Q2 is connected to the power supply, a resistor R7 is connected in parallel between the emitter and base of transistor Q2, and the collector of transistor Q2 is connected to the enable signal of the main power supply.
[0009] The hard-wire wake-up signal from the bidirectional diode TVS1 is also connected to a voltage divider circuit composed of voltage divider resistors R3 and R4. After voltage division, it is filtered by capacitor C1 and output as a hard-wire wake-up detection signal.
[0010] Furthermore, the bidirectional diode TVS1 is model number SM6A30CA.
[0011] Furthermore, the transistor Q1 is model LH8050PLTIG, and the transistor Q2 is model L2SA812RLT1G.
[0012] Furthermore, the Schottky diodes D1, D2, D3, and D4 are of model number 1N5819.
[0013] The beneficial effects of this utility model are: it provides a multi-path wake-up circuit that supports multiple wake-up sources, and the wake-up sources are ORed with each other, so that the circuit can be woken up as long as there is one of them, and there is no interference between the wake-up sources.
[0014] There is no leakage current in the circuit after it enters sleep mode.
[0015] The circuit structure is simple, low-cost, stable and reliable. Attached Figure Description
[0016] Figure 1 This is a circuit diagram for a multipath wake-up circuit. Detailed Implementation
[0017] The present invention will be further described below with reference to the accompanying drawings.
[0018] As attached Figure 1 As shown, the main connections of this circuit are as follows:
[0019] The hard-wire wake-up signal is connected to a bidirectional diode TVS1 (SM6A30CA) for surge absorption. After passing through the TVS1, the hard-wire wake-up signal is divided by a voltage divider circuit composed of resistors R1 (7.68K) and R2 (13K) and then fed to the positive terminal of Schottky diode D4 (1N5819). The internal wake-up hold signal is connected to the positive terminal of Schottky diode D1 (1N5819), the Gsensor wake-up signal is connected to the positive terminal of Schottky diode D2 (1N5819), and the CAN wake-up signal is connected to Schottky diode D3 (1N5819). The positive terminals of Schottky diodes D1, D2, D3, and D4 are connected together and then connected to resistor R5 (100K). After being filtered by capacitor C2 (100nF), the signal is fed into the base of transistor Q1 (LH8050PLTIG). The emitter of transistor Q1 is grounded, and the collector of Q1 is connected to the base of transistor Q2 (L2SA812RLT1G) through resistor R6 (22K). The emitter of transistor Q2 is connected to the power supply. A resistor R7 (10K) is connected in parallel between the emitter and base of transistor Q2. The collector of transistor Q2 is connected to the enable signal of the main power supply. The hard-wired wake-up signal, after passing through bidirectional diode TVS1, is also connected to a voltage divider circuit composed of voltage divider resistors R3 (100K) and R4 (22K). After voltage division, the signal is filtered by capacitor C1 (47nF) and output as a hard-wired wake-up detection signal.
[0020] The working principle is as follows:
[0021] This circuit supports four wake-up signal inputs: hard-wired wake-up signal, CAN wake-up signal, Gsensor wake-up signal, and internal wake-up hold signal. Due to the presence of diodes D1, D2, D3, and D4, the wake-up sources will not interfere with each other.
[0022] Wake-up: When any one or more wake-up signals are input, transistor Q1 will turn on. The turn-on of transistor Q1 pulls its collector low, causing transistor Q2 to turn on due to the voltage division of resistors R7 and R6, thus enabling the main power supply signal. The hard-wired wake-up detection signal is used to check if the wake-up was caused by a hard-wired wake-up signal. The Gsensor wake-up signal is a level pulse. An internal wake-up hold signal is used to maintain continuous wake-up and can also be used to delay sleep. When a sleep state is received, the internal wake-up hold signal remains high for 2 seconds, facilitating safe operation before power-down.
[0023] Hibernation: When all wake-up signals are low, transistor Q1 is turned off, which opens its collector. Since transistor Q2 is connected in parallel with resistor R7, its base and emitter voltages are equal, thus turning off Q2 and making the main power enable signal high impedance.
[0024] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A multipath wake-up circuit, characterized in that: Includes a hard-wired wake-up signal, an internal wake-up hold signal, a Gsensor wake-up signal, a CAN wake-up signal, a bidirectional diode TVS1, a voltage divider circuit consisting of voltage divider resistors R1 and R2, Schottky diodes D1, D2, D3, and D4, a resistor R5, a capacitor C2, a transistor Q1, a resistor R6, a transistor Q2, a resistor R7, a voltage divider circuit consisting of voltage divider resistors R3 and R4, and a capacitor C1; The hard-wire wake-up signal is connected to one end of the bidirectional diode TVS1, and the other end of the bidirectional diode TVS1 is grounded for surge absorption. The hard-wire wake-up signal from the bidirectional diode TVS1 is divided by the voltage divider circuit composed of voltage divider resistors R1 and R2 and then sent to the positive terminal of the Schottky diode D4. The internal wake-up hold signal is connected to the positive terminal of the Schottky diode D1, the Gsensor wake-up signal is connected to the positive terminal of the Schottky diode D2, the CAN wake-up signal is connected to the positive terminal of the Schottky diode D3, and the negative terminals of the Schottky diodes D1, D2, D3, and D4 are connected together and then connected to one end of the resistor R5. The other end of resistor R5 is divided into two paths: one path is connected to one end of capacitor C2, and the other end of capacitor C2 is grounded for filtering; the other end is connected to the base of transistor Q1, the emitter of transistor Q1 is grounded, the collector of transistor Q1 is connected to the base of transistor Q2 through resistor R6, the emitter of transistor Q2 is connected to the power supply, a resistor R7 is connected in parallel between the emitter and base of transistor Q2, and the collector of transistor Q2 is connected to the enable signal of the main power supply. The hard-wire wake-up signal from the bidirectional diode TVS1 is also connected to a voltage divider circuit composed of voltage divider resistors R3 and R4. After voltage division, it is filtered by capacitor C1 and output as a hard-wire wake-up detection signal.
2. The multipath wake-up circuit according to claim 1, characterized in that: The bidirectional diode TVS1 is model number SM6A30CA.
3. The multipath wake-up circuit according to claim 1, characterized in that: The transistor Q1 is model LH8050PLTIG, and the transistor Q2 is model L2SA812RLT1G.
4. The multipath wake-up circuit according to claim 1, characterized in that: The Schottky diodes D1, D2, D3, and D4 are model number 1N5819.