DE-112019002642-B4 - Vehicle-internal power supply unit

Abstract

Vehicle-internal power supply device (1) configured to decrease a voltage applied to a first conductive path (10) electrically connected to a capacitive component (46) and apply the resulting voltage to a second conductive path (12), or to increase a voltage applied to the second conductive path (12) and apply the resulting voltage to the first conductive path (10), wherein the vehicle-internal power supply device (1) comprises: a first voltage conversion unit (21) comprising a first driver switching element (40), a second driver switching element (42) and a first inductor (44), which performs a first voltage conversion operation in accordance with a first control signal, in which switching alternately between an ON signal and an OFF signal is applied to the first driver switching element (40), whereby a voltage applied to the first conductive path (10) is reduced and an output voltage is applied to the second conductive path (12), and which performs a third voltage conversion operation in accordance with a third control signal, in which switching alternately between an ON signal and an OFF signal is applied to the second driver switching element (42), whereby a voltage applied to the second conductive path (12) is increased and an output voltage is applied to the first conductive path (10); a switching element (24) for preventing backflow, which is provided on the second conductive path (12) and which prevents a current flow on the second conductive path (12) in the direction of the first voltage conversion unit (21) when it is switched off; a second inductance (26) which is provided between the first voltage conversion unit (21) and the switching element (24) for backflow prevention on the second conductive path (12) and in series with the switching element (24) for backflow prevention; a semiconductor element part (28) formed by a diode or a switching element, one end of which is electrically connected between the second inductor (26) and the switching element (24) for reverse flow prevention on the second conductive path (12), and the other end of which is electrically connected to a conductive reference path; and a control unit (88) which outputs the first control signal to at least the first driver switching element (40) and outputs the third control signal to the second driver switching element (42), wherein several first voltage conversion units (21) are connected in parallel to each other between the first conductive path (10) and the second conductive path (12), a second voltage conversion unit (22) is provided by the switching element (24) for reverse flow prevention, the second inductor (26) and the semiconductor element part (28), and, if the part of the second conductive path (12) that is on the side of the first voltage conversion unit (21) as seen from the second voltage conversion unit (22) is considered an output-side conductive path (12B), and the part of the second conductive path (12) that is on the side opposite to the side of the first voltage conversion unit (21) is considered an input-side conductive path (12A), the second voltage conversion unit (22) performs the second voltage conversion operation, reducing the voltage applied to the input-side conductive path (12A) and applying an output voltage to the output-side conductive path (12B) is created the control unit (88) is configured to cause the second voltage conversion unit (22) to perform the second voltage conversion process upon fulfillment of a certain pre-charging condition, a second control signal, in which an ON signal and an OFF signal are alternately switched, is applied to the switching element (24) to prevent backflow, and After the start of the second voltage conversion process, the control unit (88) supplies the third control signal to only some of the first voltage conversion units (21) when a certain switching condition is met, causing some of the first voltage conversion units (21) to perform the third voltage conversion process.

Inventors

• Kazuki MASUDA

Assignees

• AUTONETWORKS TECHNOLOGIES, LTD.
• SUMITOMO WIRING SYSTEMS, LTD.
• SUMITOMO ELECTRIC INDUSTRIES, LTD.

Dates

Publication Date

20260513

Application Date

20190514

Priority Date

20180524

Claims (3)

1. Vehicle-internal power supply device (1) configured to decrease a voltage applied to a first conductive path (10) electrically connected to a capacitive component (46) and apply the resulting voltage to a second conductive path (12), or to increase a voltage applied to the second conductive path (12) and apply the resulting voltage to the first conductive path (10), wherein the vehicle-internal power supply device (1) comprises: a first voltage conversion unit (21) having a first driver switching element (40), a second driver switching element (42), and a first inductor (44) which performs a first voltage conversion operation in accordance with a first control signal, in which switching alternately between an ON signal and an OFF signal, and which is supplied to the first driver switching element (40), decreasing a voltage applied to the first conductive path (10), and an output voltage is applied to the second conductive path (12), and which performs a third voltage conversion process, in accordance with a third control signal, in which switching alternately between an ON signal and an OFF signal, and which is supplied to the second driver switching element (42), increasing a voltage applied to the second conductive path (12), and applying an output voltage to the first conductive path (10); a switching element (24) for preventing backflow, which is provided on the second conductive path (12), and which prevents a current flow on the second conductive path (12) in the direction of the first voltage conversion unit (21) when it is switched off; a second inductor (26) provided between the first voltage conversion unit (21) and the switching element (24) for backflow prevention on the second conductive path (12) and in series with the switching element (24) for backflow prevention; a semiconductor element part (28) formed by a diode or a switching element, one end of which is electrically connected between the second inductor (26) and the switching element (24) for backflow prevention on the second conductive path (12), and the other end of which is electrically connected to a conductive reference path; and a control unit (88) which outputs the first control signal to at least the first driver switching element (40), and outputs the third control signal to the second driver switching element (42), wherein several first voltage conversion units (21) are connected in parallel to each other between the first conductive path (10) and the second conductive path (12), a second voltage conversion unit (22) is provided by the switching element (24) for backflow prevention, the second inductor (26) and the semiconductor element part (28), and, if the part of the second conductive path (12) which is on the side of the first voltage conversion unit (21) as seen from the second voltage conversion unit (22) is considered an output-side conductive path (12B), and the part of the second conductive path (12) which is on the side opposite to the side of the first voltage conversion unit (21) is considered a The input conductive path (12A) is considered, the second voltage conversion unit (22) performs the second voltage conversion process, reducing the voltage applied to the input conductive path (12A) and applying an output voltage to the output conductive path (12B), and the control unit (88) is configured to to cause the second voltage conversion unit (22) to carry out the second voltage conversion process when a certain pre-charge condition is met by applying a second control signal, in which an ON signal and an OFF signal are alternately switched, to the switching element (24) for backflow prevention, and after the start of the second voltage conversion process, the control unit (88) supplies the third control signal only to some of the several first voltage conversion units (21) when a certain switching condition is met, thereby causing some of the first voltage conversion units (21) to carry out the third voltage conversion process.
2. Vehicle internal power supply unit (1) according Claim 1 , comprising: several third conductive paths (60) serving as a power supply path from the second conductive path (12) to the control unit (88), wherein the third conductive paths (60) are connected in parallel to each other between the second conductive path (12) and the control unit (88), and a voltage generation unit (66) is provided on one of the third conductive paths (60), which increases a voltage applied to the conductive path on the side of the second conductive path (12) and which applies the output voltage to the conductive path on the side of the control unit (88).
3. Vehicle internal power supply unit (1) according Claim 1 or 2 , wherein after the start of the second voltage conversion process, the control unit (88) supplies the third control signal to only one first voltage conversion unit (21) of the several first voltage conversion units (21) when a certain switching condition is met, causing the one first voltage conversion unit (21) to carry out the third voltage conversion process.

Description

TECHNICAL AREA The present invention relates to an in-vehicle power supply device. TECHNICAL BACKGROUND In vehicles equipped with a rechargeable battery, when, for example, the ignition is switched off, the battery is disconnected from any load connected to it and, in some cases, put into standby mode to limit its current draw. In this standby mode, charges accumulated in the capacitive components of the load are discharged, increasing the voltage difference between the battery terminals and the load. If the rechargeable battery is connected to the load when this voltage difference is large, a significant inrush current will be drawn between the battery and the load. A technical apprenticeship, as it is taught in the JP 2017-22805 A The method revealed has been proposed as a technical teaching for solving this type of problem. According to the JP 2017-22805 A According to the disclosed technical teaching, before the rechargeable battery and the load are connected, the generation of a large inrush current between the rechargeable battery and the load is limited by pre-charging a capacitive component in the load using a DC-DC boost converter. The DE 11 2016 003 991 T5 Disclosing a DC-DC converter comprising: a voltage converter unit containing a first switching element, positioned between a first conductor path connected to a high-potential terminal of a primary-side power supply unit and a second conductor path connected to a high-potential terminal of a secondary-side power supply unit, converting a voltage applied to the first conductor path by switching the first switching element between an ON state and an OFF state, and outputting the resulting voltage to the second conductor path; an abnormal state detection unit that detects a specific abnormal state; a first protection circuit unit comprising a second switching element provided in a high-voltage-side conductor path, with respect to the first conductor path and the second conductor path, and switching between an OFF state in which the second switching element blocks at least one current flowing in one direction towards the voltage transformer unit, and an ON state in which the second switching element releases the blocking, wherein the first protection circuit unit switches the second switching element to an OFF state if the detection unit for an abnormal condition detects the abnormal condition; and a second protective circuit unit comprising a third switching element provided in a third conductor path located between the voltage converter unit and a reference conductor path maintained at a specific reference potential lower than the potential of the first conductor path and the potential of the second conductor path, and switching between an OFF state in which the third switching element blocks at least one current flowing from the reference conductor path and an ON state in which the third switching element releases the blocking, wherein the second protective circuit unit switches the third switching element to an ON state when a terminal of at least one low-voltage power supply unit, with respect to the primary-side power supply unit and the secondary-side power supply unit, is in a normal connection state, and switches the third switching element to an OFF state when the terminal of at least one low-voltage power supply unit is in a reverse polarity state. The JP 2017 - 085 810 A Disclosing a vehicle power supply system, comprising: a high-voltage circuit including a main battery and a load, and a relay switching between a connected and disconnected state of the connection between the main battery and the load, further comprising a capacitor between the relay and the load, and an auxiliary DC/DC converter whose primary side is connected to an auxiliary battery and whose secondary side is connected to the capacitor, and which, before the relay switches from the disconnected state to the connected state, boosts the voltage of the auxiliary battery and charges the capacitor, wherein, if a voltage sensor for detecting the voltage of the main battery has failed, the auxiliary DC/DC converter boosts the output voltage up to an intermediate voltage value and charges the capacitor, wherein the intermediate voltage value is between a maximum open-circuit voltage (OCV) and a minimum open-circuit voltage (OCV), which correspond, respectively, to a maximum state of charge (SOC) and a minimum state of charge (SOC) in a predetermined SOC usage range of the main battery. OVERVIEW OF THE INVENTION TASKS TO BE SOLVED FROM THE INVENTION Furthermore, to perform precharging using a DC-DC converter, a switching element, which serves as the main component performing the voltage conversion, must be driven by a driver, and for this purpose, energy must be supplied to the driver. In recent years, however, to obtain the power required for DC-DC converters, a design has been used in which several switching elements are arranged in parallel, and the converters are connected