JP2003132664A - Electric equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide electric equipment consisting of a plurality of casings in which cost is reduced and maintaining of performance is made easy. SOLUTION: A casing 10 is provided with an AC-DC conversion circuit 13 which converts an a.c. voltage VAC1 supplied from a commercial power supply (not shown in the figure) into a d.c. voltage VDC2 . A casing 20 is provided with an AC-DC conversion circuit 23 which converts an a.c. voltage VAC3 being outputted from the casing 10 to d.c. voltages VDC3 to VDC7 , a large current circuit 21a (a circuit having a larger driving current than a small current circuit 21b) which makes the voltage VDC2 a driving voltage, and the circuit 21b (a circuit that needs a plurality of driving voltages) which makes the voltages VDC3 to VDC7 a driving voltage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric device including a plurality of housings. In particular, the present invention relates to an audio device having a plurality of housings.

[0002]

2. Description of the Related Art An audio device is a typical example of an electric device having a plurality of casings. There are two types of conventional audio devices having a plurality of housings.

First, FIG. 2 shows a first configuration of a conventional audio apparatus having a plurality of housings. The housing 10 ′ includes an amplifier 11, an AC-DC conversion circuit 12, an AC-DC conversion circuit 13, and an AC-DC conversion circuit 14.
Further, the housing 20 ′ includes an audio signal reproduction circuit 21 including a large current circuit 21a and a small current circuit 21b.

An AC voltage V _AC1 sent from a commercial power source (not shown) is input to an AC-DC conversion circuit 12, an AC-DC conversion circuit 13, and an AC-DC conversion circuit 14.

The AC-DC conversion circuit 12 has an AC voltage V
_AC1DC voltage V_DC1To the amplifier 11 and send it to the amplifier 11.
The AC-DC conversion circuit 13 has an AC voltage V_AC1DC voltage
V_DC2Converted to DC voltage V_DC2DC voltage supply line 2
Is sent to the large current circuit 21a via. AC-DC conversion
The circuit 14 has an AC voltage V_AC1Multiple DC voltage V_DC3~ V
_DC7Converted to DC voltage V_DC3~ V_DC7DC voltage supply
It is sent to the small current circuit 21b via the feeders 3a to 3e.

The large current circuit 21a operates by using the DC voltage V _DC2 as a driving voltage, and the small current circuit 21b operates by the DC voltage V _DC3.
The operation is _performed with ~ V _DC7 as the drive voltage. Specifically, the audio signal reproduction circuit 21 including the large current circuit 21a and the small current circuit 21b reads data from a recording medium (not shown) such as a CD and generates an audio reproduction signal based on the data. , The audio reproduction signal is sent to the amplifier 11.

Further, the amplifier 11 operates by using the DC voltage V _DC1 as a drive voltage. Specifically, the amplifier 11 amplifies the audio reproduction signal and then sends it to the speaker 4. As a result, sound is emitted from the speaker 4.

Next, FIG. 3 shows a second configuration of a conventional audio device having a plurality of housings. The same parts as those in FIG. 2 are designated by the same reference numerals. The housing 10 ″ is the amplifier 1
1. AC-DC conversion circuit 12 and AC-AC conversion circuit 1
5 and an AC-AC conversion circuit 16. Also,
The housing 20 ″ includes a large current circuit 21a and a small current circuit 21.
The audio signal reproduction circuit 21 is composed of b, the AC-DC conversion circuit 22, and the AC-DC conversion circuit 23.

An AC voltage V _AC1 sent from a commercial power supply (not shown) is input to the AC-DC conversion circuit 12, the AC-AC conversion circuit 15, and the AC-AC conversion circuit 16.

The AC-DC conversion circuit 12 has an AC voltage V
_{The AC1} is converted into a DC voltage V _DC1 and sent to the amplifier 11.

The AC-AC conversion circuit 15 has an AC voltage V
_AC1 steps down converted to an AC voltage V _AC2 and the AC voltage V _AC2
Is transmitted to the AC-DC conversion circuit 22 via the AC voltage supply line 5. The AC-DC conversion circuit 22 converts the AC voltage V _AC2 into a DC voltage V _DC2 and sends the DC voltage V _DC2 to the large current circuit 21a.

The AC-AC conversion circuit 16 has an AC voltage V
_AC1 steps down converted to an AC voltage V _AC3 and the ac voltage V _AC3
Is sent to the AC-DC conversion circuit 23 via the AC voltage supply line 6. The AC-DC conversion circuit 23 converts the AC voltage V _AC3 into a plurality of DC voltages V _{DC3 to} V _DC7 and outputs the DC voltage V _{DC3.
DC3 to} V _DC7 are sent to the small current circuit 21b.

The large current circuit 21a operates by using the DC voltage V _DC2 as a driving voltage, and the small current circuit 21b operates by the DC voltage V _DC3.
The operation is _performed with ~ V _DC7 as the drive voltage. Specifically, the audio signal reproduction circuit 21 including the large current circuit 21a and the small current circuit 21b reads data from a recording medium (not shown) such as a CD and generates an audio reproduction signal based on the data. , The audio reproduction signal is sent to the amplifier 11.

Further, the amplifier 11 operates by using the DC voltage V _DC1 as a drive voltage. Specifically, the amplifier 11 amplifies the audio reproduction signal and then sends it to the speaker 4. As a result, sound is emitted from the speaker 4.

[0015]

In the conventional audio device shown in FIG. 2, it is necessary to provide a return circuit (GND) corresponding to each DC voltage V _{DC3 to} V _DC7 in the small current circuit 21b. A DC voltage supply line (not shown) for connecting the AC-DC conversion circuit 14 (not shown) is also required. Since the small current circuit 21b becomes a complicated circuit as described above, the cost of the audio device as a whole is increased and it is difficult to secure the performance of the audio signal reproducing circuit 21.

Further, in the conventional audio apparatus shown in FIG. 3, a large amount of heat loss is involved in voltage conversion in the AC-DC conversion circuit 22 in which a large current flows, so that not only the case 10 '' side but also the case 10 '' side A heat dissipation structure was also required on the 20 ″ side. This heat dissipation structure causes a cost increase and the housing 2
It was an obstacle to the miniaturization of 0 ''. The AC-DC conversion circuit 22 through which a large current flows is connected to the audio signal reproduction circuit 21.
It is difficult to secure the performance of the audio signal reproduction circuit 21 because it is installed near the.

In view of the above problems, it is an object of the present invention to provide an electric device consisting of a plurality of casings which is inexpensive and whose performance can be easily ensured.

[0018]

In order to achieve the above object, in an electric device comprising a plurality of housings according to the present invention, a first housing, which is one of the plurality of housings, is an AC A first AC-DC converting means for converting an AC voltage supplied from a power supply into a DC voltage; and an AC voltage output means for outputting an AC voltage based on the AC voltage supplied from the AC power supply, A second housing, which is one of the housings, receives the DC voltage sent from the first AC-DC conversion means and the AC voltage sent from the AC voltage output means. To do.

Further, the second casing has a first circuit which uses a DC voltage sent from the first AC-DC converting means as a drive voltage, and an AC voltage sent from the AC voltage output means. A second AC-DC converting means for converting the DC voltage into a DC voltage, and a second circuit using the DC voltage sent from the second AC-DC converting means as a drive voltage, the first circuit Drive current may be larger than the drive current of the second circuit.

Further, the second AC / DC converting means may send a plurality of DC voltages to the second circuit.

[0021] Also, in the audio device including a plurality of casings, the second casing includes audio signal reproducing means including the first circuit and the second circuit,
And a third AC-DC converting means for converting an AC voltage supplied from the AC power supply into a DC voltage,
The amplification means for amplifying the output signal of the audio signal reproduction means by using the DC voltage sent from the AC-DC conversion means as the driving voltage.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of an audio device including a plurality of housings according to the present invention. The same parts as those in FIGS. 2 and 3 are designated by the same reference numerals.

The housing 10 comprises an amplifier 11, an AC-DC conversion circuit 12, an AC-DC conversion circuit 13, and an AC-AC conversion circuit 16. Further, the housing 20 includes an audio signal reproduction circuit 21 including a large current circuit 21a and a small current circuit 21b, and an AC-DC conversion circuit 23.

AC-DC conversion circuits 12, 13, and 23
As one embodiment, there is a configuration in which a smoothing capacitor is provided in the next stage of a full-wave rectifier circuit in which four diodes are bridge-connected, and a switching regulator is provided in the next stage of the smoothing capacitor. Further, as one embodiment of the AC-AC conversion circuit 16, a transformer can be mentioned.

An AC voltage V _AC1 sent from a commercial power source (not shown) is input to the AC-DC conversion circuit 12, the AC-DC conversion circuit 13, and the AC-AC conversion circuit 16.

The AC-DC conversion circuit 12 has an AC voltage V
_{The AC1} is converted into a DC voltage V _DC1 and sent to the amplifier 11.

The AC-DC conversion circuit 13 has an AC voltage V
The _AC1 is converted to a DC voltage V _DC2, and sends the DC voltage V _DC2 large current circuit 21a via a DC voltage supply line 2.

The AC-AC conversion circuit 16 has an AC voltage V
_AC1 steps down converted to an AC voltage V _AC3 and the ac voltage V _AC3
Is sent to the AC-DC conversion circuit 23 via the AC voltage supply line 6. The AC-DC conversion circuit 23 converts the AC voltage V _AC3 into a plurality of DC voltages V _{DC3 to} V _DC7 and outputs the DC voltage V _{DC3.
DC3 to} V _DC7 are sent to the small current circuit 21b.

The large current circuit 21a is specifically a servo circuit of the disk reproducing device, a driving circuit of various mechanisms, a circuit of a display device, etc., which has a large driving current. Large current circuit 2
1a operates with a DC voltage V _DC2 as a drive voltage.

Further, the small current circuit 21b is specifically a signal reproducing analog circuit, a digital circuit or the like, and its driving current is smaller than that of the large current circuit 21a. Small current circuit 21
b usually requires a DC voltage having a different value, a DC voltage having a different timing, or an independent DC voltage for ensuring circuit performance. Therefore, the small current circuit 21b is connected to a plurality of DC voltages (in the present embodiment, five DC voltages V _{DC3 to} V _DC3
Operates with _DC7 ) as the drive voltage.

By the operation of the large current circuit 21a and the small current circuit 21b in this way, the audio signal reproducing circuit 21 including the large current circuit 21a and the small current circuit 21b becomes
Read data from a recording medium (not shown) such as a CD,
An audio reproduction signal is generated based on the data, and the audio reproduction signal is sent to the amplifier 11.

Further, the amplifier 11 operates by using the DC voltage V _DC1 as a drive voltage. Specifically, the amplifier 11 amplifies the audio reproduction signal and then sends it to the speaker 4. As a result, sound is emitted from the speaker 4.

As described above, the electric device having a plurality of casings according to the present invention includes the AC-DC conversion circuits 13 and 23 for generating the drive voltage of the audio signal reproduction circuit 21, and the AC-DC through which a large current flows. The conversion circuit 13 is separately installed in the housing 10, and the AC-DC conversion circuit 23 in which a large current does not flow is separately installed in the housing 20. Therefore, the power supply circuit in the housing 20 has an AC-DC conversion circuit 23 in which a large current does not flow.
Only. Therefore, the housing 20 does not need to have a heat dissipation structure for a large-current power supply circuit, and the heat dissipation structure of the housing 20 is simplified. As a result, the size and weight of the housing 20 can be reduced.

Further, by disposing the AC-DC conversion circuit 13 through which a large current flows in the housing 10, a heat dissipation structure shared with the AC-DC conversion circuit 12 can be provided in the housing 10. This makes it possible to reduce the cost of the audio device as a whole.

Further, since the AC-DC converting circuit 23 for sending the plurality of DC voltages V _{DC3 to} V _DC7 to the small current circuit 21b is installed in the casing 20, the casing 10 and the casing 20 are connected. The voltage supply lines are only the DC voltage supply line 2 and the AC voltage supply line 6, and the number of connection lines between the cases can be reduced as compared to the conventional audio device shown in FIG.

Since the AC-DC conversion circuit 13 through which a large current flows is installed in the housing 10, there is no power supply circuit through which a large current flows near the audio signal reproduction circuit 21. This makes it possible to prevent interference of the power supply circuit in the audio signal reproduction circuit 21, and the audio signal reproduction circuit 2
It becomes easy to secure the performance of No. 1 and the performance of the entire audio device can be improved.

In the present embodiment, an audio device having two housings has been described, but the present invention is not limited to this, and can be applied to an electric device having three or more housings. You can

For example, in the case of an audio device having three housings, the first housing is the housing 10 of FIG. 1 and the second housing is the housing 20 of FIG. The configuration of the third casing will be described with reference to the casing 20 of FIG.

The third case is a large current circuit 21a and a small current.
When the circuit 21b is provided, the DC voltage is applied to the third housing.
V_DC2Input terminal and AC voltage V_AC3Input terminal
And the AC-DC conversion circuit 23. Well
In addition, the third housing includes the large current circuit 21a, and the small current circuit
21b is not provided, the DC voltage V
_DC2Provide a terminal for inputting. Also, the third
The housing has a small current circuit 21b and a large current circuit 21a.
If not, AC voltage V is applied to the third housing._{AC 3}Enter
So that the AC power supply terminal and the AC-DC conversion circuit 23 are provided.
To do.

[0040]

According to the present invention, in an electric device having a plurality of housings, the first housing, which is one of the plurality of housings, converts an AC voltage supplied from an AC power supply into a DC voltage. A second housing that is one of the plurality of housings, and includes a first AC-DC converting means and an AC voltage output means that outputs an AC voltage based on the AC voltage supplied from the AC power supply. Since the body inputs the DC voltage sent from the first AC-DC converting means and the AC voltage sent from the AC voltage output means, the body receives the AC voltage of the AC power source from the case other than the case. It is possible to reduce the number of connection lines between the casings as compared with the conventional electric device (see FIG. 2) in which all the voltages sent to the casings are DC voltages. This allows
It is possible to reduce the cost and simplify the connection between the housings. In particular, when the second AC-DC converting means, which will be described later, outputs a large number of DC voltages, a remarkable effect is obtained.

Further, according to the present invention, the second casing is provided with a first circuit which uses a DC voltage sent from the first AC-DC converting means as a drive voltage, and the AC voltage output means. Second, which converts the transmitted AC voltage to DC voltage
AC-DC converting means, and a second circuit that uses a DC voltage sent from the second AC-DC converting means as a drive voltage, and the drive current of the first circuit is the second circuit. Since the driving current of the circuit is larger than the driving current of the circuit,
The AC-DC converting means of 1 is separately installed in the first housing, and the second AC-DC converting means through which a large current does not flow is installed in the second housing. For this reason,
It is not necessary to provide a heat dissipation structure for the large-current power supply circuit on the second case, and the heat dissipation structure of the second case is simplified.
This makes it possible to reduce the size and weight of the second housing and increase the degree of freedom in designing the entire electric device.

Further, since the first AC / DC converting means through which a large current flows is installed in the first casing, the first AC / DC converting means is provided.
There is no power supply circuit in which a large current flows near the second circuit and the second circuit. Thereby, the first circuit and the second circuit
It is possible to prevent the power supply circuit from interfering with the other circuit, it becomes easy to ensure the performance of the first circuit and the second circuit, and it is possible to improve the performance of the entire electric device.

Further, according to the present invention, there is provided an audio device comprising a plurality of casings, wherein the second casing comprises audio signal reproducing means comprising the first circuit and the second circuit. The first casing drives a third AC-DC converting unit that converts an AC voltage supplied from the AC power source into a DC voltage, and a DC voltage sent from the third AC-DC converting unit. The heat dissipation structure shared by the first AC-DC converting means and the third AC-DC converting means is provided, since the first heat-generating structure includes an amplifying means for amplifying an output signal of the audio signal reproducing means as a voltage. Can be provided in the housing. This makes it possible to reduce the cost of the audio device as a whole.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an audio device according to the present invention.

FIG. 2 is a diagram showing a configuration of a conventional audio device.

FIG. 3 is a diagram showing another configuration of a conventional audio device.

[Explanation of symbols]

10, 20 housing 11 amplifier 12, 13, 23 AC-DC conversion circuit 16 AC-AC conversion circuit 21 Audio signal reproduction circuit 21a Large current circuit 21b Small current circuit

Claims (4)

[Claims] 1. An electric device comprising a plurality of housings, wherein a first housing, which is one of the plurality of housings, converts a AC voltage supplied from an AC power supply into a DC voltage. A DC converter, and an AC voltage output unit that outputs an AC voltage based on the AC voltage supplied from the AC power supply, wherein the second casing, which is one of the plurality of casings, is the first casing. 1. An electric device, wherein a DC voltage sent from one AC-DC converting means and an AC voltage sent from the AC voltage output means are input. 2. The first housing, wherein the second housing uses a DC voltage sent from the first AC-DC converting means as a drive voltage.
Circuit, and second AC-DC conversion means for converting the AC voltage sent from the AC voltage output means into a DC voltage,
A second circuit that uses a DC voltage sent from the second AC-DC converting means as a drive voltage, and the drive current of the first circuit is larger than the drive current of the second circuit. The electric device according to 1. 3. The second AC-DC converting means is the second AC-DC converting means.
The electric device according to claim 2, wherein a plurality of DC voltages are sent to the circuit. 4. An audio device comprising a plurality of casings, wherein the second casing comprises an audio signal reproducing means comprising the first circuit and the second circuit, the first casing. A third AC-DC converting means for converting an AC voltage supplied from the AC power source into a DC voltage;
The electric device according to claim 3, further comprising: an amplifying unit that amplifies an output signal of the audio signal reproducing unit by using a DC voltage sent from the third AC-DC converting unit as a driving voltage.