CN-115729279-B - AC generating circuit and heating device

Abstract

The invention provides an alternating current generating circuit and a temperature raising device. The AC generation circuit includes a first capacitor having a first end connected to a positive electrode side of a power storage body having an inductance component, a second capacitor having a first end connected to a negative electrode side of the power storage body, a parallel switch section connecting a second end of the first capacitor to the first end of the second capacitor in accordance with a first control signal, thereby connecting the first capacitor and the second capacitor in parallel to the power storage body, a series switch section connecting the second end of the first capacitor to the second end of the second capacitor in accordance with a second control signal, thereby connecting the first capacitor and the second capacitor in series to the power storage body, and an inductor connected between both terminals of the series switch section.

Inventors

• OHNUKI YASUMICHI

Assignees

• 本田技研工业株式会社

Dates

Publication Date

20260505

Application Date

20220824

Priority Date

20210901

Claims (17)

1. 1. An AC generation circuit for heating an electric power storage body by generating an AC current based on electric power stored in the electric power storage body, the electric power storage body having an inductance component, wherein, The AC generation circuit includes: A first capacitor having a first end connected to a positive electrode side of the power storage body; a second capacitor having a first end connected to a negative electrode side of the power storage body; A parallel switch unit that connects a second end of the first capacitor to the first end of the second capacitor and connects the first end of the first capacitor to the second end of the second capacitor in response to a first control signal, thereby connecting the first capacitor and the second capacitor in parallel to the power storage body; A series switch unit that connects the second end of the first capacitor and the second end of the second capacitor in accordance with a second control signal, thereby connecting the first capacitor and the second capacitor in series to the power storage body, and And an inductor connected between both terminals of the series switching section.
2. 2. The alternating current generating circuit according to claim 1, wherein, The parallel switch section has: A first switch having a first terminal connected to the second end of the first capacitor and a second terminal connected to the first end of the second capacitor, and A second switch having a first terminal connected to said first end of said first capacitor and a second terminal connected to said second end of said second capacitor, The series switching section has a third switch having a first terminal connected to the second end of the second capacitor and a second terminal connected to the second end of the first capacitor, The inductor is connected in parallel between the first terminal of the third switch and the second terminal of the third switch.
3. 3. The alternating current generating circuit according to claim 2, wherein, The inductance of the inductor is approximately one third of the inductance component.
4. 4. The alternating current generating circuit according to claim 1, wherein, The parallel switch section has: A first switch having a first terminal connected to the second end side of the first capacitor and a second terminal connected to the first end of the second capacitor, and A second switch having a first terminal connected to the first end of the first capacitor and a second terminal connected to the second end side of the second capacitor, The series switch section has: A third switch having a first terminal connected to the second terminal of the second switch and a second terminal connected to the second terminal of the first capacitor, and A fourth switch having a first terminal connected to the second terminal of the second capacitor and a second terminal connected to the first terminal of the first switch, The inductor has: A first inductor having a first end connected to the first terminal of the fourth switch and a second end connected to the second terminal of the third switch; a second inductor having a first end connected to the first end of the first inductor and a second end connected between the second terminal of the second switch and the first terminal of the third switch, and A third inductor having a first end connected between the first terminal of the first switch and the second terminal of the fourth switch and a second end connected to the second end of the first inductor.
5. 5. The AC generation circuit of claim 4, wherein, The inductance of the first inductor is approximately one third of the inductance component.
6. 6. The AC generation circuit of claim 5, wherein, The inductance of the second inductor is equal to the inductance of the third inductor.
7. 7. The alternating current generating circuit according to claim 1, wherein, The inductance component includes an inductance component that a wiring portion between the power storage body and the ac generating circuit has.
8. 8. The alternating current generating circuit according to claim 1, wherein, The first capacitor and the second capacitor have the same capacitance.
9. 9. A temperature increasing device is provided with: the AC generation circuit as claimed in any one of claims 1 to 8, and And a control unit that outputs, as the first control signal, a signal of a predetermined duty ratio that turns the parallel switch unit into a conductive state or a nonconductive state, and outputs, as the second control signal, a signal of the predetermined duty ratio that turns the series switch unit into a conductive state or a nonconductive state, and alternately switches a first state in which the parallel switch unit is turned into a conductive state and the series switch unit is turned into a nonconductive state and a second state in which the parallel switch unit is turned into a conductive state by the first control signal and the second control signal.
10. 10. The heating apparatus according to claim 9, wherein, The predetermined duty cycle is approximately 50%.
11. 11. The heating apparatus according to claim 9, wherein, The power storage unit is configured to connect a plurality of storage batteries in series, and the plurality of storage batteries are connected to the ac generation circuit, respectively.
12. 12. The heating apparatus according to claim 11, wherein, The control unit controls the phases of the alternating currents generated by the plurality of alternating current generating circuits to be shifted by 180 degrees from each other.
13. 13. The heating apparatus according to claim 9, wherein, The control unit sets a dead time for making both the parallel switch unit and the series switch unit non-conductive during the switching period between the first state and the second state.
14. 14. The heating apparatus according to claim 13, wherein, The predetermined duty ratio is in a range of 45% to 55%, and the dead time is set by the duty ratio.
15. 15. The heating apparatus according to claim 9, wherein, In the second state, the series switching section shorts the inductor.
16. 16. The heating apparatus according to claim 9, wherein, In the first state, the inductor is disposed between the first capacitor and the second capacitor.
17. 17. The heating apparatus according to claim 9, wherein, The control unit controls the parallel switch unit and the series switch unit without setting a dead time for making both the parallel switch unit and the series switch unit non-conductive.

Description

AC generating circuit and heating device Technical Field The present invention relates to an ac generating circuit and a temperature increasing device. Background Countermeasures for reducing adverse effects on the global environment (for example, reduction of NO x、SOx, reduction of CO 2) are increasingly advancing. Accordingly, in recent years, attention has been paid to an electric vehicle that runs at least by an electric motor driven by electric power supplied from a battery (secondary battery) such as a Hybrid electric vehicle (HEV: hybrid ELECTRIC VEHICLE) or a Plug-in Hybrid ELECTRIC VEHICLE, in order to reduce CO 2 from the viewpoint of improving the global environment. Further, as a battery for vehicle-mounted use, use of a lithium ion secondary battery has been studied. In these electric vehicles, it is important to sufficiently exhibit the performance of the secondary battery. It is known that if the temperature of the secondary battery in use falls below a suitable range, the charge/discharge performance is degraded. Further, by raising the temperature of the secondary battery to an appropriate level at the time of use, deterioration of charge/discharge performance can be suppressed. In this regard, for example, japanese patent No. 5293820 discloses a technique related to a temperature increasing device for increasing the temperature of a secondary battery. In the temperature increasing device disclosed in japanese patent No. 5293820, the secondary battery is actively caused to generate a ripple current of a predetermined frequency in a frequency region in which the absolute value of the impedance is relatively lowered, based on the frequency characteristics of the impedance of the secondary battery, thereby increasing the temperature of the secondary battery. Disclosure of Invention However, in the prior art, there are cases where the temperature of the secondary battery cannot be raised efficiently. The present invention has been made in view of the above-described problems, and an object thereof is to provide an ac generating circuit and a temperature increasing device capable of improving energy efficiency by increasing the temperature of a secondary battery more efficiently. Solution for solving the problem The ac generating circuit and the temperature increasing device of the present invention have the following configurations. (1) An AC generation circuit according to an aspect of the present invention is an AC generation circuit for increasing the temperature of an electric storage device by generating an AC current based on electric power stored in the electric storage device, the electric storage device having an inductance component, wherein the AC generation circuit includes a first capacitor having a first end connected to a positive electrode side of the electric storage device, a second capacitor having a first end connected to a negative electrode side of the electric storage device, a parallel switch unit for connecting a second end of the first capacitor to the first end of the second capacitor in response to a first control signal, and connecting the first end of the first capacitor to a second end of the second capacitor, thereby connecting the first capacitor and the second capacitor in parallel to the electric storage device, and a series switch unit for connecting the second end of the first capacitor to the second end of the second capacitor in response to a second control signal, thereby connecting the first capacitor and the second capacitor to the electric storage device in series, and a switch unit connected in series between both terminals. (2) In the embodiment (1) above, the parallel switch unit has a first switch having a first terminal connected to the second end of the first capacitor and a second terminal connected to the first end of the second capacitor, and a second switch having a first terminal connected to the first end of the first capacitor and a second terminal connected to the second end of the second capacitor, and the series switch unit has a third switch having a first terminal connected to the second end of the second capacitor and a second terminal connected to the second end of the first capacitor, and the inductor is connected in parallel between the first terminal of the third switch and the second terminal of the third switch. (3) Based on the scheme of the (2), the inductance of the inductor is approximately one third of the inductance component. (4) On the basis of the scheme of the (1), the parallel switch part is provided with a first switch, a second switch and a first switch, wherein a first terminal of the first switch is connected with the second end side of the first capacitor, and a second terminal of the first switch is connected with the first end of the second capacitor; and a second switch having a first terminal connected to the first end of the first capacitor, a second terminal connected to the second end side of the second c