JP-2026075552-A - Power control unit

JP2026075552AJP 2026075552 AJP2026075552 AJP 2026075552AJP-2026075552-A

Abstract

[Problem] To provide a power control device that can suppress the accelerated deterioration of inter-system switches. [Solution] The inter-system switch is a normally-off type that connects a first system that supplies power from a first power source to a first load and a second system that supplies power from a second power source to a second load. The power supply circuit supplies the power supply voltage to drive the inter-system switch. The controller is a controller that controls the inter-system switch and performs an initialization process when the system starts up, as well as a reset confirmation process that resets itself during the initialization process. The controller is provided with a drive port that is set to output an ON signal to turn on the inter-system switch while the reset is in progress, and is controlled to output an OFF signal from the drive port to turn off the inter-system switch during the initialization process. The power supply circuit starts supplying the power supply voltage after the reset confirmation process. [Selection Diagram] Figure 5

Inventors

松本健
森川誠也

Assignees

株式会社デンソーテン

Dates

Publication Date: 20260508
Application Date: 20241120
Priority Date: 20241022

Claims (7)

A normally-off inter-system switch connects a first system that supplies power from the first power source to the first load and a second system that supplies power from the second power source to the second load, A power supply circuit that supplies a power supply voltage to drive the aforementioned inter-system switch, A controller for controlling the aforementioned inter-system switch, which performs an initialization process when the system starts up and a reset confirmation process that performs a reset of itself during the initialization process, Equipped with, The aforementioned controller, A drive port is provided that is configured to output an ON signal to turn on the inter-system switch while the reset is being performed, and is controlled to output an OFF signal to turn off the inter-system switch during the initialization process. The aforementioned power supply circuit is A power control device that starts supplying the power voltage after the reset confirmation process.
The aforementioned controller, The first clock signal is output to the power supply circuit. The aforementioned power supply circuit is As the power supply voltage, a first power supply voltage based on the first clock and a second power supply voltage based on the second clock output from the clock generation circuit upon system startup are generated. The power supply control device according to claim 1, wherein the generation of both the first power supply and the second power supply is started after the reset confirmation process.
The aforementioned controller, The power control device according to claim 2, wherein the clock generation circuit is instructed to output the power supply voltage after the reset confirmation process.
The aforementioned power supply circuit is The power control device according to claim 2, further comprising a delay circuit that delays the clock output of the clock generation circuit that generates the second clock until after the reset confirmation process when the system is started.
The aforementioned clock generation circuit is A power control device according to any one of claims 2 to 4, wherein once the output of the second clock is started, the clock output continues even if the reset occurs until the system is terminated.
The aforementioned controller, The power control device according to claim 2, wherein the output of the first clock is not started after the system has started up and before the reset confirmation process is performed.
The aforementioned inter-system switch is equipped with a driver that outputs a drive signal, The aforementioned driver The power control device according to claim 1, which outputs a drive signal corresponding to the signal output from the drive port when the aforementioned power supply voltage is input.

Description

This invention relates to a power supply control device. Conventionally, redundant power supply systems are known that include an inter-system line connecting a first system supplying power from a first power source to a first load and a second system supplying power from a second power source to a second load (see, for example, Patent Document 1). Patent Document 1 discloses a normally-off type inter-system switch that is configured to remain off even when the ignition (hereinafter, IG) is off and no power is supplied to drive the inter-system switch. This configuration reduces the power consumption required to turn off the inter-system switch. Furthermore, the power supply voltage for driving the inter-system switch is generated by a clock output by a controller that starts up after the IG is turned on. Incidentally, the controller performs an initialization process to reset the state of various systems during startup after ignition (IG). During this initialization process, the controller's drive port, which controls the inter-system switches, is controlled by the controller to maintain a signal output state that turns the inter-system switches OFF. In other words, the inter-system switches remain OFF during the initialization process. On the other hand, the controller may perform initialization and reset confirmation processes after the ignition is turned on, to verify that the reset operation is working correctly. It is generally assumed that the controller will be reset only if a malfunction occurs during operation. Therefore, if the controller is reset, the inter-system switch must be configured to maintain a safe state, where power supply to the load is maintained. For this reason, the controller's drive port is set to output a signal that controls the inter-system switch to be turned on during the reset and restart process. In other words, the inter-system switch remains in the ON state during the reset confirmation process. Japanese Patent Publication No. 2022-111637 Figure 1 is an explanatory diagram of the configuration and operation of a power control device according to an embodiment.Figure 2 is an explanatory diagram of the configuration and operation of the power control device according to the embodiment.Figure 3 is an explanatory diagram of the configuration and operation of the power control device according to the embodiment.Figure 4 is an explanatory diagram of the configuration and operation of the power control device according to the embodiment.Figure 5 illustrates the operation of the power control device immediately after the IG (Integrated Generator) is turned on.Figure 6 shows an example of a power supply circuit configuration.Figure 7 shows another example of a power supply circuit configuration.Figure 8 is a timing chart showing the operation timing of the power control device immediately after the IG is turned on. The power control device according to the embodiment will be described in detail below with reference to the attached drawings. However, this invention is not limited to the embodiments shown below. The following description will focus on the case where the vehicle on which the power control device according to the embodiment is installed is an electric vehicle or a hybrid vehicle. The power control device according to the embodiment is a redundant power supply device primarily intended for vehicles equipped with an autonomous driving function, and is designed to supply power to loads requiring power supply even if the main power supply fails, mainly during autonomous driving. Furthermore, the vehicle equipped with the power control device according to this embodiment may be an engine-powered vehicle that runs on an internal combustion engine. [Configuration of power supply control device] The configuration and operation of the power control device 1 according to the embodiment will be described with reference to Figures 1 to 4. Figures 1 to 4 are explanatory diagrams of the configuration and operation of the power control device 1 according to the embodiment. As shown in Figure 1, the power control device 1 according to the embodiment is connected to the main power supply 10, the first load 101, the general load 102, the second load 103, the automatic operation control device 100, and the IG 200. The power control device 1 comprises a first system 110 and a second system 120. The first system 110 is a power supply system that supplies power from the main power supply 10 to the first load 101 and the general load 102. The second system 120 is a power supply system that supplies power from the backup power supply 20 (described later) to the second load 103. The main power supply 10 is the first power supply, and the backup power supply 20 is the second power supply. The first load 101 includes loads for autonomous driving. The first load 101 includes, for example, a steering motor, electric brake system, and onboard cameras that operate during autonomous driving. The g