JP3240969B2 - In-vehicle DC / AC converter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-vehicle DC / AC converter used when AC electric equipment is used in a vehicle.

[0002]

2. Description of the Related Art Conventionally, a vehicle-mounted DC / AC converter used in a vehicle receives a battery voltage of a vehicle-mounted battery from a cigarette lighter socket provided in the vehicle and converts the battery voltage into a DC-DC converter and a DC-DC converter. It is converted to a single-phase 100V AC voltage by a DC / AC conversion circuit unit composed of an AC inverter and the like.

As shown in FIG. 2, such a vehicle-mounted DC / AC converter includes a power supply adapter 2 mounted on a cigarette lighter socket and supplied with a battery voltage, and a power supply conversion unit 3 containing a DC / AC conversion circuit unit. It is composed of The power adapter 2 and the power conversion unit 3 are connected by a cable 4. The battery voltage supplied to the power adapter 2 is input to the DC / AC conversion circuit of the power conversion unit 3 via a pair of DC power lines in the cable 4. The AC voltage output from the DC / AC conversion circuit is supplied to an AC outlet 20 provided in the power adapter 2 via a pair of AC power lines in the cable 4. Therefore, the power plug of the AC electric device can be connected to the AC outlet 20 of the power adapter 2 for use.

[0004]

By the way, four power lines, that is, a pair of DC power lines and a pair of AC power lines are accommodated in a cable 4 for connecting the power adapter 2 and the power conversion unit 3. Therefore, the cable 4 did not have sufficient flexibility. As a result, with the power adapter 2 attached to the cigar lighter socket, the place where the power conversion unit 3 is placed in the vehicle cannot be changed freely without difficulty.
Not easy to use.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a power supply adapter attached to a battery power outlet and a battery voltage supplied from the power adapter via a cable. And a power conversion unit for converting the single-phase AC voltage into a single-phase AC voltage and supplying the single-phase AC voltage to the AC adapter via the cable to an AC outlet. It is in.

[0006]

In order to solve the above problems, the invention according to claim 1 is mounted on a battery power outlet provided in a vehicle and supplied with a battery voltage from a vehicle battery. A power adapter integrally including an AC outlet for externally supplying a single-phase AC voltage, a power conversion unit including a DC / AC conversion circuit unit for converting the battery voltage to the single-phase AC voltage, and the power adapter and then connects the power converting unit, a DC power supply line for supplying the power source the DC-AC conversion circuit section the supplied battery voltage to the adapter, the single-phase AC voltage converted by the DC-AC converting circuit section in-vehicle DC-AC conversion device and a cable that houses the AC power line supplying the AC power outlet, the DC-AC
The conversion circuit section has a step-up transformer and is housed in the cable.
It has been the one power supply line and the ac power line of the DC power supply line and a reference power supply line and common to one common power supply line.

According to a second aspect of the present invention, in the first aspect, the one power supply line is a low potential side power supply line. According to a third aspect of the present invention, in the first or second aspect, the battery voltage outlet is a cigarette lighter socket.

(Operation) According to the first aspect of the present invention,
The battery voltage supplied to the power adapter mounted on the battery power outlet provided in the vehicle is supplied to the DC / AC converter of the power converter by the DC power line and the common power line of the cable. The battery voltage supplied to the DC / AC conversion circuit is converted into a single-phase AC voltage, which is also supplied to the AC outlet of the power adapter via the AC power line and the common power line of the cable. Therefore, the cable is composed of only three power lines, and the flexibility is improved.

According to the second aspect of the present invention, the first aspect is provided.
In addition to the operation of the invention described in (1), the reference potential of the single-phase AC voltage becomes equal to the low potential side of the battery voltage. According to the third aspect of the invention, in addition to the operation of the first or second aspect, when a power adapter is mounted on the cigarette lighter socket, a single-phase AC voltage is supplied to the AC outlet of the power adapter. Is done.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 2 shows a usage state of the vehicle-mounted DC / AC converter 1. This vehicle-mounted DC / AC converter 1 includes a power adapter 2, a power conversion unit 3, a power adapter 2, and a power conversion unit 3.
And a cable 4 for connecting

FIG. 1 shows an electrical configuration of a vehicle-mounted DC / AC converter 1. As shown in FIG. 1, the power adapter 2 is mounted on a cigarette lighter socket 5 serving as a battery power outlet provided inside the vehicle. A battery voltage VB is supplied from a vehicle-mounted battery (hereinafter referred to as a battery) 6 to the power adapter 2 mounted on the cigarette lighter socket 5. The power adapter 2 supplies a single-phase AC voltage (hereinafter, AC voltage) VA obtained by converting the battery voltage VB into the vehicle. This battery voltage VB is 12V.

The power conversion unit 3 has a battery voltage VB
To an AC voltage VA. This AC voltage VA is 100V. The cable 4 connects the power supply adapter 2 and the power supply conversion unit 3, supplies the battery voltage VB supplied to the power supply adapter 2 to the DC / AC conversion circuit section 7, and outputs the battery voltage VB from the DC / AC conversion circuit section 7. AC voltage VA is supplied to the power adapter 2.

Next, the configuration of the power adapter 2 will be described in detail. FIG. 3 shows the power supply adapter 2. As shown in FIG. 3, the case of the power adapter 2 includes a lower case portion 10,
It consists of an upper case part 11 and a cap 12. The power adapter 2 is provided with a plug 13 to be inserted into the cigarette lighter socket 5. This plug part 13
Is a known mechanism in which a battery voltage VB is supplied from the battery 6 by being inserted into the cigar lighter socket 5.

FIG. 4 shows a state in which the upper case portion 11 has been removed (however, the plug portion 13 has a flat cross section). FIG.
As shown in FIG. 2, the plug portion 13 is connected to a positive terminal (shown in FIG. 1) 14 in the cigarette lighter socket 5 connected to the positive side of the battery 6, and is also connected to the negative side of the battery 6. And a spring portion 17 connectable to a negative terminal 16 (shown in FIG. 1).
The chip 15 has a positive terminal 18 supported in the case.
Is electrically connected to The spring portion 17 is electrically connected to a negative terminal 19 provided in the case.

In the power adapter 2, one end of the cable 4 is introduced from the lower case portion 10 into the case.
The power adapter 2 is provided with one AC outlet 20 in the upper case portion 11. The AC outlet 20 includes a reference terminal 21 and a non-reference terminal 22. The reference side terminal 21 is connected to one of the plus side terminal 18 and the minus side terminal 19 by an electric wire 23. In the present embodiment, the reference side power supply line 21 is
It is connected to the negative terminal 19.

The cable 4 has a DC positive power line (hereinafter referred to as a positive power line) connected to the positive terminal 18.
24, an AC non-reference side power supply line (hereinafter referred to as a non-reference side power supply line) 25 connected to the non-reference side terminal 22, and a reference side terminal 2
1 and a common power supply line 26 as a low-potential-side power supply line and a reference-side power supply line.

Therefore, in the power adapter 2, the spring portion 17 connected to the negative side of the battery 6 and the reference terminal 21 of the AC outlet 20 are both connected to the common power line 26. In the present embodiment, the positive power supply line 2
4 and the common power supply line 26 constitute a DC power supply line, and the non-reference side power supply line 25 and the common power supply line 26 constitute an AC power supply line.

Next, the configuration of the power conversion unit 3 will be described in detail. As shown in FIG. 1, the power conversion circuit unit 7 of the power conversion unit 3 includes a DC-DC converter 30 and a DC-AC
This is a known circuit configuration including an inverter 31 and the like. FIG.
Shows an electric circuit of the DC-DC converter 30 and the DC-AC inverter 31.

As shown in FIG. 5, the DC-DC converter 30 includes a pair of switching elements 32a and 32b, a step-up transformer 33, a rectifier circuit 34, a smoothing capacitor 35, and the like, and makes the battery voltage VB higher than the battery voltage VB. The voltage is converted to a DC voltage VC. The DC-AC inverter 31 includes an H-bridge circuit 36, and converts the high DC voltage VC generated by the DC-DC converter 30 into an AC voltage VA.
Convert to

The power conversion circuit unit 7 includes a known converter control circuit (not shown) for controlling the pair of switching elements 32 and a known inverter control circuit (not shown) for controlling the H-bridge circuit 36. ing.

As shown in FIG. 5, the common power supply line 26 of the cable 4 is connected to the negative input terminal 37 of the DC-DC converter 30 and the reference output terminal 38 of the DC-AC inverter 31. . Similarly, the positive power supply line 24 is connected to the positive input terminal 39 of the DC-DC converter 30, and the non-reference power line 25 is also connected to the non-reference output terminal 40 of the DC-AC inverter 31. I have.

The power conversion unit 3 is provided with an AC outlet 41. Next, the operation of the vehicle-mounted DC / AC converter configured as described above will be described.

Power adapter 2 is connected to cigarette lighter socket 5
, The battery voltage VB is supplied from the battery 6 to the power supply adapter 2, and the battery voltage VB is connected to the DC-AC converter circuit 7 by the positive power supply line 24 and the common power supply line 26 in the cable 4. The voltage is applied between the positive input terminal 39 and the negative input terminal 37 of the DC converter 30.

The battery voltage VB is converted into a high-voltage DC voltage VC by the DC-DC converter 30, and the DC-AC
Output to inverter 31. This high voltage DC voltage V
C is converted into a 100 V AC voltage VA by the DC-AC inverter 31 and is output to the non-reference side output terminal 40 and the reference side output terminal 3.
8 and are output.

The AC voltage VA output from the DC / AC conversion circuit unit 7 is supplied to the AC outlet 2 of the power adapter 2 by the non-reference side power line 25 and the common power line 26 in the cable 4.
0 is supplied. Accordingly, the 12V battery voltage VB supplied to the power adapter 2 mounted on the cigarette lighter socket 5 is converted into an AC voltage VA of 100V and supplied from the AC outlet 20 of the power adapter 2.

Here, since the minus input terminal 37 of the DC-DC converter 30 and the reference output terminal 38 of the DC-AC inverter 31 are connected, the AC voltage VA output from the DC-AC inverter 31 is Reference voltage is DC
-It is equal to the negative potential of the battery voltage VB supplied to the DC converter 30.

Therefore, according to the in-vehicle DC / AC converter 1 of the present embodiment, the power supply line accommodated in the cable 4 connecting the power supply adapter 2 and the power supply conversion unit 3 has the positive power supply line 24 and the non-positive power supply line 24. Reference side power supply line 25 and common power supply line 2
6 is enough.

As described in detail above, the following effects can be obtained with the on-vehicle DC / AC converter of the present embodiment. (A) A negative power supply line of a DC power supply line for supplying the battery voltage VB from the power supply adapter 2 to the power supply conversion unit 3 and a reference power supply of an AC power supply line for supplying the AC voltage VA from the power supply conversion unit 3 to the power supply adapter 2. And a common power supply line 26. Therefore, it is only necessary to connect the power adapter 2 and the power conversion unit 3 with only three power lines. As a result, the cable 4 having only three power lines can be provided, so that the flexibility of the cable 4 is improved. Therefore, the place where the power conversion unit 3 is placed in the vehicle can be freely changed while the power adapter 2 is inserted into the cigar lighter socket 5.

(B) Since the low-potential power supply line of the DC power supply line is shared with the reference power supply line of the AC power supply line, the reference potential of the externally supplied AC voltage becomes equal to the low potential side of the battery voltage. .

(C) Since the power supply adapter 2 is inserted into the cigarette lighter socket 5 to take out the battery voltage VB, the AC voltage VA can be taken out from the AC outlet 2 of the power supply adapter 2 mounted on the cigarette lighter socket 5.

(D) The battery voltage VB of 12 V is set to 10
Since it is converted to a single-phase AC voltage VA of 0 V, 1
An AC voltage VA of 100 V can be obtained in a normal vehicle equipped with a battery 6 having an output voltage of 2 V.

(E) Since only one AC outlet 20 is provided in the power adapter 2, the power adapter 2 is downsized. (F) Since the AC outlet 41 is provided in the power conversion unit 3, the AC voltage VA can be extracted from each of the power adapter 2 and the power conversion unit 3.

The embodiment is not limited to the above embodiment, but may be modified as follows. The battery power outlet is not limited to the cigarette lighter socket 5 as long as the battery voltage VB of the vehicle-mounted battery 6 can be taken out to the power adapter 2 in the vehicle, and a power jack provided only for taking out the battery voltage VB. And so on.

In the above embodiment, the low-potential-side power supply line of the DC power supply line and the reference-side power supply line of the AC-side power supply line are shared, but the high-potential-side power supply line of the DC power supply line is connected to the reference-side power supply line. It may be shared with the power supply line.

A battery voltage VB other than 12 V, for example, a battery voltage VB such as 24 V, 48 V, etc.
It may be a DC-AC converter for in-vehicle use that converts the power to DC power. or,
The predetermined battery voltage VB is changed to an AC voltage VA other than 100V.
For example, a DC / AC converter for converting a single-phase AC voltage VA such as 110 V or 200 V may be used.

The number of AC outlets 20 provided in the power adapter 2 is not limited to one, and may be two or more. The AC outlet 41 may not be provided in the power supply conversion unit 3.

Hereinafter, in addition to the technical idea described in the claims, the technical idea grasped from each of the above embodiments will be described together with its effects. (1) In the vehicle-mounted DC / AC converter according to any one of claims 1 to 3, an AC outlet for extracting a single-phase AC voltage output from the DC / AC conversion circuit unit is provided in the power supply conversion unit. Was provided. According to such a configuration, a single-phase AC voltage can be extracted from each of the power adapter and the power conversion unit.

(2) In the DC / AC converter for vehicle use according to any one of claims 1 to 3, the battery voltage is 12V and the AC voltage is 100V. According to such a configuration, it is possible to use an AC electric device having a commercial AC voltage specification of 100 V in a general vehicle equipped with a battery voltage of 12 V.

In this specification, means and members according to the present invention are defined as follows. (1) The battery power outlet is not limited to the cigarette lighter socket, but may be a power jack or the like provided only for taking out the battery voltage. Shall be included.

[0040]

According to the first to third aspects of the present invention, a power adapter attached to a battery power outlet and a battery voltage supplied from the power adapter via a cable are converted into a single-phase AC voltage. The flexibility of the cable can be improved in a vehicle-mounted DC / AC converter having a power conversion unit for supplying the single-phase AC voltage to the AC outlet of the power adapter via the cable.

According to the second aspect of the invention, the reference potential of the single-phase AC voltage supplied to the outside becomes equal to the low potential side of the battery voltage. According to the third aspect of the invention, a single-phase AC voltage can be extracted from the AC outlet of the power adapter attached to the cigarette lighter socket.

[Brief description of the drawings]

FIG. 1 is an electric block diagram of a vehicle-mounted DC / AC converter.

FIG. 2 is a perspective view showing a use state of the on-vehicle DC / AC converter.

FIG. 3 is a perspective view showing a power adapter.

FIG. 4 is an exploded plan view showing the power adapter.

FIG. 5 is an electric circuit diagram of the DC / AC converter.

[Explanation of symbols]

Reference numeral 2 denotes a power adapter, 3 denotes a power conversion unit, 4 denotes a cable, 5 denotes a cigarette lighter socket as a battery power outlet, 6 denotes a vehicle-mounted battery, 7 denotes a DC / AC conversion circuit, 20 denotes an AC outlet, and 24 denotes a DC power line. A non-reference side power line constituting an AC power line; 26 a common power line serving as a low potential side power line and a reference side power line constituting a DC power line and an AC power line;
VA: single-phase AC voltage, VB: battery voltage.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02M 7/5387 B60R 16/02 H01R 31/06

Claims (3)

(57) [Claims] 1. A power adapter which is mounted on a battery power outlet provided inside a vehicle, is supplied with a battery voltage from a vehicle battery, and integrally has an AC outlet for supplying a single-phase AC voltage to the outside. A power conversion unit including a DC / AC conversion circuit unit that converts the battery voltage into the single-phase AC voltage; connecting the power adapter and the power conversion unit;
A DC power supply line for supplying a battery voltage supplied to the power adapter to the DC / AC conversion circuit unit;
And a cable accommodating an AC power supply line that supplies a single-phase AC voltage converted by the circuit unit to the AC outlet, the vehicle-mounted DC-AC conversion device, wherein the DC-AC conversion circuit unit includes a step-up transformer, One of the DC power lines housed in the cable and
Automotive DC-AC converter in common of the reference power line of the ac power line to one of the common power line. 2. The on-vehicle DC / AC converter according to claim 1, wherein the one power supply line is a low-potential-side power supply line. 3. The vehicle-mounted DC / AC converter according to claim 1, wherein the battery voltage outlet is a cigarette lighter socket.