DE102019204114A1 - Power supply system for a vehicle - Google Patents

Abstract

[Problem] To provide a power supply system capable of preventing unwanted discharge from a capacitor in a path connecting a rechargeable power supply inside a vehicle and a DC power input input: [solution] A power supply system includes: a fast charging input (9) to which a DC power supply (10) can be connected; a capacitor (31, 32, 33) in a path interconnecting a plus pole of the fast charge input (9) and a negative pole of the fast charge input (9); an electrical load (4) to which a rechargeable battery (51) can be connected; a first switch (11) in a path interconnecting a positive pole of the fast charging input (9) and the capacitor (31, 32, 33); a second switch (12) in a path interconnecting a negative terminal of the fast charging input (9) and the capacitor (31, 32, 33); a first diode (21) arranged to allow current to flow in only one direction from the positive pole of the fast charging input (9) toward the capacitor (31, 32, 33); and a second diode (22) arranged to allow current to flow in only one direction from the capacitor (31, 32, 33) toward the negative terminal of the fast charging input (9). The first diode (21) and the first switch (11) are connected in parallel. The second diode (22) and the second switch (12) are connected in parallel.

Description

[Technical area]

The present invention relates to a power supply system for a vehicle.

[Prior Art]

Inverters are known which can perform noise regulation and reduction to prevent mixing of noise in vehicle circuits. JP2017-184328A , hereinafter referred to as "Patent Literature 1", describes a noise reduction circuit including capacitors for reduction of noise contained in a current supplied to an inverter from a DC power supply.

[State of the art]

[Patent Literature]

Patent Literature 1: JP2017-184328A

[Brief Description of the Invention]

[Technical problem]

In the case where such a noise reduction circuit is in a charging path, a capacitor in the circuit stores electrical energy when recharging an on-vehicle rechargeable power supply through an external charging device via a fast charging input terminal serving as a fast charging input or DC power supply Input can be called. When a path is to be grounded from the fast charging input or from the external charging device to the capacitor, there is a high probability that the electric charge will be discharged from the capacitor.

Thus, it is an object of the present invention to provide a power supply system capable of preventing unwanted discharge from a capacitor in a path interconnecting a rechargeable power supply inside a vehicle and a DC power input.

[Solution to the problem]

There is provided a power system for supplying electrical power from a non-vehicle DC power supply via a DC power input to the vehicle to a rechargeable power supply inside the vehicle, the power system comprising: a capacitor in a path having a plus pole of the DC power supply Input and a negative pole of the DC supply input interconnects; an electrical load connected to the rechargeable power supply inside the vehicle; a first switch in a path interconnecting the plus pole of the DC power input and the capacitor; a second switch in a path interconnecting the negative terminal of the DC power input and the capacitor; a first diode arranged to allow current to flow in only one direction from the positive pole of the DC power supply input toward the capacitor; and a second diode arranged to allow current to flow in only one direction from the capacitor toward the negative terminal of the DC power input; wherein the first diode and the first switch are connected in parallel; the second diode and the second switch are connected in parallel; the capacitor and the electrical load are connected in parallel in a path interconnecting the first diode, the electrical load and the second diode; and the first switch, the capacitor, the second switch and the rechargeable power supply are connected in series inside the vehicle.

Advantageous Effect of the Invention

As described above, the present invention can prevent unwanted discharge from the capacitor in the path interconnecting the rechargeable power supply and the DC power input.

list of figures

• 1 FIG. 10 is a block diagram illustrating a power supply system for a vehicle.
• 2 is a circuit diagram illustrating the power supply system.
• 3 is a timing diagram for the power system.

[Detailed description]

There is provided a power system for supplying electrical power from a non-vehicle DC power supply via a DC power input to the vehicle to a rechargeable power supply inside the vehicle, the power system comprising: a capacitor in a path having a positive pole of the DC power supply Input and one Negative pole of the DC supply input interconnects; an electrical load connected to the rechargeable power supply inside the vehicle; a first switch in a path interconnecting the plus pole of the DC power input and the capacitor; a second switch in a path interconnecting the negative terminal of the DC power input and the capacitor; a first diode arranged to allow current to flow in only one direction from the positive pole of the DC power supply input toward the capacitor; and a second diode arranged to allow current to flow in only one direction from the capacitor toward the negative terminal of the DC power input; wherein the first diode and the first switch are connected in parallel; the second diode and the second switch are connected in parallel; the capacitor and the electrical load are connected in parallel in a path interconnecting the first diode, the electrical load and the second diode; and the first switch, the capacitor, the second switch and the rechargeable power supply are connected in series inside the vehicle.

As described above, the present invention can prevent unwanted discharge from the capacitor in the path interconnecting the rechargeable power supply and the DC power input.

[Embodiment (s)]

The present embodiment of a power supply system according to the invention is described with reference to the accompanying drawings.

In 1 denotes the reference numeral 1 generally a vehicle in which a power system is installed. The vehicle 1 includes an inverter 3 , an electrical load 4 , a battery pack 5 and a control unit 6 ,

The motor 2 is in the form of, for example, a synchronous motor including a rotor with a number of permanent magnets embedded therein and a stator with stator coils. The application of three-phase AC voltages to the stator coils causes the stator to generate a rotating magnetic field that passes through the rotor and generates torque.

The control unit 6 controls the inverter 3 To control three-phase AC voltages to the motor 2 to apply. The inverter 3 generates a three-phase AC voltage in response to a torque command given thereto by the control unit 6 is fed, and this leads to the engine 2 to.

The electrical load 4 includes all types of devices attached to the vehicle 1 are mounted and by an electric current from the battery pack 5 to be activated. Examples of such devices are an audio system, a navigation system, an air conditioner, a meter display system, and lamps such as headlamps.

The battery pack 5 is arranged to the inverter 3 and the electrical load 4 to supply an electric current. As power supply includes the battery pack 5 a rechargeable battery 51 (please refer 2 ), which may be in the form of a nickel battery or a lithium battery.

Regarding the battery pack 5 are the inverter 3 and the electrical load 4 connected in parallel. An AC / DC converter 7 is in a parallel arrangement with respect to the inverter 3 and the electrical load 4 with the battery pack 5 connected. The AC / DC converter 7 can have an alternating current, which is an ac supply input 8th can be supplied to convert into a direct current.

The battery 51 (please refer 2 ) is supplied with an electric current from a DC power supply 10 recharged by a charging port for a DC power supply 10 outside the vehicle 1 with a fast charging input 9 for the battery pack 5 is coupled. The fast charging input 9 detects if the charging port for the DC power supply 10 with the fast charging input 9 is coupled or not and informs the control unit 6 in relation to the detection result.

The battery pack 5 has a voltage sensor, a temperature sensor and a current sensor, which are not shown. The voltage sensor is arranged to supply a voltage of the battery 51 to detect (see 2 ). The temperature sensor is arranged to a temperature of the battery 51 to detect. The current sensor is arranged to provide a recharge current to the battery 51 and a discharge current from the battery 51 to detect.

At the control unit 6 It is a computer unit that includes a central processing unit (CPU), random access memory (RAM), read-only memory (ROM), flash memory, input ports, and output ports.

The ROM of the control unit 6 Along with various control constants and various maps, it stores computer-readable programs that enable the computer unit to function as the control unit 6 acts. So the computer unit acts as the control unit 6 wherein the CPU executes the programs stored in the ROM.

With the input terminals of the control unit 6 There are various sensors connected to the fast charging input 9 , the voltage sensor, the temperature sensor and the current sensor include. With the output terminals of the control unit 6 On the other hand, there are various control objects connected to the inverter 3 , the electrical load 4 as well as the battery pack 5 include.

Referring to 2 includes the inverter 3 a circuit for reducing noise. The noise reduction circuit includes a capacitor 31 , a capacitor 32 and a capacitor 33 To reduce noise in the inverter 3 supplied electric power is included.

In a path that is the positive pole of the fast charging input 9 and the inverter 3 connects to each other, there is a first switch 11 , In a path that is the negative pole of the fast charging input 9 and the inverter 3 connects to each other, there is a second switch 12 ,

The first switch 11 and a first diode 21 are connected in parallel. The first diode 21 is arranged so that the flow of an electric current in one direction only from the positive pole of the fast charging input 9 towards the inverter 3 admitted.

The second switch 12 and a second diode 22 are connected in parallel. The second diode 22 is arranged so that the flow of an electric current in one direction only from the inverter 3 towards the negative terminal of the fast charging input 9 admitted.

The first switch 11 , the inverter 3 and the second switch 12 are in terms of the battery 51 connected in series.

The electrical load 4 and the inverter 3 are connected in parallel in a path which is the first diode 21 , the inverter 3 and the second diode 22 connects in series with each other.

The plus pole of the AC / DC converter 7 is connected to a path that is the positive pole of the battery 51 and the parallel circuit interconnects, in which the first switch 11 and the first diode 21 are connected in parallel. The negative pole of the AC / DC converter 7 is connected to a path that is the negative pole of the battery 51 and the parallel circuit interconnects, in which the second switch 12 and the second diode 22 are connected in parallel.

If desired, the parallel circuit in which the first switch 11 and the first diode 21 connected in parallel, to a path connecting the positive pole of the fast charging input 9 and the plus pole of the AC / DC converter 7 interconnects, and the parallel connection, in which the second switch 12 and the second diode 22 can be connected in parallel with a path which is the negative pole of the fast charging input 9 and the negative pole of the AC / DC converter 7 connects with each other.

In a path that is the positive pole of the fast charging input 9 and connects a path to each other, which is the positive pole of the battery 51 and the inverter 3 connects to each other, there is a third switch 13 , In a path that is the negative pole of the fast charging input 9 and connects a path to each other, which is the negative pole of the battery 51 and the inverter 3 connects to each other, there is a fourth switch 14 ,

With the positive pole of the battery 51 is a fifth switch 15 connected. With the negative pole of the battery 51 is a sixth switch 16 connected.

The control unit 6 controls ON / OFF (CLOSED / OPEN) of each of the first switch 11 , the second switch 12 , the third switch 13 , the fourth switch 14 , the fifth switch 15 and the sixth switch 16 ,

The control unit 6 puts each one off the first switch 11 and the second switch 12 in anticipation of detecting a coupling of a charging port for the DC power supply 10 outside the vehicle 1 with the fast charging input 9 in an open state (OFF).

The control unit 6 puts each one off the third switch 13 and the fourth switch 14 in response to the detection of a coupling of the charging port for the DC power supply 10 outside the vehicle 1 with the fast charging input 9 in a closed state (ON).

The control unit 6 puts each of the fifth switch 15 and the sixth switch 16 in response to the detection of a coupling of the charging port for the DC power supply 10 outside the vehicle 1 with the fast charging input 9 in a closed state (ON).

The configuration described above can return the flow of the capacitors 31 . 32 and 33 during the time of charging via the fast charging input 9 to stop. Due to that no unwanted discharge from the capacitors 31 . 32 and 33 takes place, there is less likelihood of leakage current out of the path of the capacitors 31 . 32 and 33 to the fast charging input 9 or the charging device of the DC power supply 10 ,

In a parallel connection of the first switch 11 , the inverter 3 and the second switch 12 , which are connected in series, and the electrical load 4 further, the electric load 4 without any interruption, even though each of the first and second switches 11 and 12 is placed in the open state, allowing a functioning of the electrical load 4 , such as an air conditioner or a heater, during the period of charging the vehicle 1 via the fast charging input 9 is possible.

Referring now to 3 That is, the power supply system to which the present embodiment relates and which is configured as above operates as follows.

In 3 At time t1, when the ignition switch is turned off, the first switch 11 and the second switch 12 switched off.

Subsequently, the fast charging input 9 at time t2 after completion of the startup process for recharging the battery 51 by coupling the charging port for an external DC power supply outside the vehicle 1 with the fast charging input 9 is started, energized (powered).

After the fast charging input 9 at the time t2 was powered, become the third switch 13 and the fourth switch 14 at the time t3 switched on to create (or close) the charging path.

Subsequently, the power supply of the fast charging input 9 at the time t4 after recharging the battery 51 separated to a satisfactory level (quick charge input 9 without electricity). At time t5 after the time t4 become the third switch 13 and the fourth switch 14 switched off to interrupt (or open) the charging path.

Subsequently, the first switch 11 and the second switch 12 at time t6 when the ignition switch is turned on to allow the battery 51 the inverter 3 and the electrical load 4 supplies a current.

Although the disclosure refers to, but is not limited to, the present embodiment, it will be apparent to those skilled in the art that modifications can be made without departing from the scope of the present invention. All such modifications and equivalents thereof are intended to be covered by the present invention.

LIST OF REFERENCE NUMBERS

1

Vehicle;

4

electrical load;

6

Control unit;

7

AC / DC converter;

8th

AC power input, which in the present embodiment is in the form of an input terminal for an AC power supply

9

DC power input, which in the present embodiment is in the form of a fast charging input, i. in the form of an input port for a quick charge;

10

DC power supply;

11

first switch,

12

second switch;

13

third switch;

14

fourth switch;

21

first diode;

22

second diode;

31, 32, 33

Capacitor;

51

rechargeable power supply, which in the present embodiment is in the form of a battery.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• JP 2017184328 A [0002, 0003]

Claims (5)

A power supply system for supplying electric power from a DC power supply (10) outside a vehicle (1) via a DC power input (9) on the vehicle (1) to a rechargeable power supply (51) inside the vehicle (1) Power supply system includes: a capacitor (31, 32, 33) in a path interconnecting a positive pole of the DC power input (9) and a negative pole of the DC power input (9); an electrical load (4) connected to the rechargeable power supply (51) inside the vehicle (1); a first switch (11) in a path interconnecting the positive pole of the DC power supply input (9) and the capacitor (31, 32, 33); a second switch (12) in a path interconnecting the negative pole of the DC power input (9) and the capacitor (31, 32, 33); a first diode (21) arranged to allow a current to flow in only one direction from the positive pole of the DC power supply input (9) toward the capacitor (31, 32, 33); and a second diode (22) arranged to allow current to flow in only one direction from the capacitor (31, 32, 33) toward the negative pole of the DC power input (9); in which the first diode (21) and the first switch (11) are connected in parallel; the second diode (22) and the second switch (12) are connected in parallel; the capacitor (31, 32, 33) and the electrical load (4) are connected in parallel in a path interconnecting the first diode (21), the electrical load (4) and the second diode (22); and the first switch (11), the capacitor (31, 32, 33), the second switch (12) and the rechargeable power supply (51) are connected in series inside the vehicle (1). Power supply system after Claim 1 comprising: an AC / DC converter (7) for converting an AC power supplied to an AC power input (8) on the vehicle (1) into a DC power, the first switch (11) and the first first diode (21) connected in parallel are in a path connecting a positive pole of the AC / DC converter (7) and the capacitor (31, 32, 33) with each other; and the second switch (12) and the second diode (22) connected in parallel are in a path connecting a negative terminal of the AC / DC converter (7) and the capacitor (31, 32, 33) , Power supply system after Claim 1 comprising: an AC / DC converter (7) for converting an AC power supplied to an AC power input (8) on the vehicle (1) into a DC power, the first switch (11) and the first one Diode (21) connected in parallel are connected to a path interconnecting the positive pole of the DC power input (9) and a positive pole of the AC / DC converter (7); and the second switch (12) and the second diode (22) connected in parallel are connected to a path interconnecting the negative pole of the DC power supply input (9) and a negative pole of the AC / DC converter (7) , Power supply system according to one of Claims 1 to 3 comprising: a control unit (6) for controlling the opening / closing of each of the first switch (11) and the second switch (12), the control unit (6) controlling each of the first switch (11) and the second switch (12) in an open state to the rechargeable power supply (51) inside the vehicle (1) with the DC power supply (10) outside the vehicle (1) via the DC power supply input (9) recharge. Power supply system according to one of Claims 1 to 3 comprising: a third switch (13) in a path interconnecting the positive pole of the DC power input (9) and a path connecting a positive pole of the rechargeable power supply (51) inside the vehicle (1) and the capacitor ( 31, 32, 33) interconnects; a fourth switch (14) in a path interconnecting the negative terminal of the DC power input (9) and a path interconnecting a negative terminal of the rechargeable power supply (51) and the capacitor (31, 32, 33); and a control unit (6) for controlling the opening / closing of each of the first switch (11), the second switch (12), the third switch (13) and the fourth switch (14), the control unit (16). 6) places each of the first switch (11) and the second switch (12) in an open state and places each of the third switch (13) and the fourth switch (14) in a closed state to energize the rechargeable power supply (51 ) inside the vehicle (1) with the DC power supply (10) outside the vehicle (1) via the DC power supply input (9) to recharge.

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