JPS59185123A - Power source - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a power supply device used in various electronic devices, and particularly to a power supply device applied when various different AC power supply voltages are applied.

(b) Prior art There are various AC power supply voltages depending on the country in the world, for example 100V, 110V, 120V, 130V, etc.
00V series and 20V such as 220V, 230■, 240■
There are various types of 0V type. Various ACs that differ from country to country
Conventionally, power supply devices that cover voltages include a transformer with many taps corresponding to the AC input between the AC input and the regulator section.
Some devices connect the input to a tap corresponding to that voltage. An example of this type of power supply device is shown in FIG.

The power supply device shown in Figure 1 uses the series regulator 2, and since the AC input voltage range of the regulator is narrow, the AC power supply device is equipped with a large number of taps to accommodate the different AC voltages depending on the country. There is a need.

FIG. 2 is a circuit diagram showing another conventional power supply device, which uses a switching regulator 4 having a relatively wide AC input voltage tolerance range (for example, 85 to 130 cm).

However, this power supply also needs to have two taps, one for the 200V system and one for the 100V system, and in any case, the conventional power supply has a large transformer, is heavy and bulky, and it is necessary to switch more taps. The drawback is that it is complicated to operate.

(c) Purpose The purpose of the present invention is to solve the above-mentioned drawbacks of the conventional power supply device, to provide a simple circuit configuration, and to provide a
An object of the present invention is to provide a power supply device that can cover C input voltage.

(d) Configuration In order to achieve the above object, the power supply device of the present invention has a first
AC power input terminal, common terminal, and these first AC
A switching regulator connected to a power input terminal and a common terminal, a second AC power input terminal, and a parallel connection circuit of a voltage limiter and a resistor connected between the first and second AC power input terminals. It is configured.

(e) Examples The present invention will be explained in more detail with reference to Examples below.

FIG. 3 is a circuit connection diagram of a power supply device showing one embodiment of the present invention. In the figure, 11 is an input terminal for inputting the 100V system AC power supply voltage, and 12 is the 200V system AC power supply voltage input terminal.
An input terminal 13 is a common input terminal for inputting the C power supply voltage. 14 is a switching regulator with a relatively wide AC input voltage tolerance range. Inputs fiA and B of the switching regulator 14 are connected to the AC power input terminal 11 and the common terminal 13, respectively. Also A
A parallel connection circuit including a voltage limiter 15 and a dummy resistor 16 is connected between the C power input terminal 11 and the AC power input terminal 12.

When connecting a 100V AC input voltage to a power supply device configured as described above, the AC
An input voltage is connected between the AC power input terminal 11 and the common terminal 13. As mentioned above, the switching regulator 14 can have a wide AC input voltage tolerance range, so if the range can be set to 85 to 130V, for example, it can handle a 100V system input. Also AC
If the input voltage is 200V, AC power input terminal 1
An AC input is connected between the terminal 2 and the common terminal 13.

In this case, the resistance value of the dummy resistor 16 is changed from the input terminal AB of the switching regulator to the switching regulator 1.
Since the voltage applied to the dummy resistor 16 becomes the set voltage of the voltage limiter 15 by setting the immunity Z larger than the resistance Z when looking at the 4th side, the voltage between the input terminals AB, that is, the switching regulation 14 The input voltage to A
This is the value obtained by subtracting the limiter setting voltage from the 200V input voltage input between the C input power supply terminal 12 and the common input terminal 13. For example, if the limiter setting voltage is 120V, A
The voltage between B is 200V input voltage minus 120cm. Therefore, if the allowable AC input voltage range of the switching regulator 14 is 85 to 130cm, the AC input voltage that can be connected between the AC power input terminal 12 and the common terminal 13 is 2
05 to 250■, and can correspond to most of the 200■ yarn inputs.

As described above, according to the power supply device, the AC input voltage is 8
It can be seen that the range is 5V-130V and 205V-250V, and can cover most of the various AC voltages from all over the world. - Since the dummy resistor 16 of the above embodiment power supply device can take a high resistance value, the power loss due to this dummy resistor 16 is small, and therefore the efficiency obtained by using the switching regulator 14 is hardly hindered. do not have.

Further, an example of the voltage limiter 15 used in the power supply device of FIG. 3 is shown in FIG. 4. That is, the voltage limiter 15 includes a series connection of a Zener diode Zdl and a diode d1, and a Zener diode Zd2.
The circuit configuration is such that the serially connected diode d2 and the diode d2 are connected in parallel with each other with opposite polarities. In this case, the voltage set by the voltage limiter 15 is equal to the respective constant voltage of the Zener diode.

In the above embodiment, for convenience of explanation, the setting voltage of the voltage limiter was explained using an example of 120V, but of course, this setting voltage does not have to be limited to 120V, and may be, for example, 115V or 130V, in short, AC 20'OV. An appropriate value that can correspond to the system input voltage may be selected.

Furthermore, in the embodiment power supply device shown in FIG. 3, the 200V AC power input terminal 12
However, it is necessary to select whether to connect to the 1oov system AC power input terminal 11, but as shown in Figure 5, switch between the 200V system AC power input terminal 12 and the 100V system AC power input terminal. It is connected to a common AC power input terminal 18 through a switch 17, and the AC input is connected to the AC power input terminal 18.
and the common terminal 19, and in the case of I OOV system AC input, set the changeover switch 17 to the AC power input terminal 11 side, and conversely, in the case of ACC voltage 200V system, set the changeover switch 17 to the AC power input terminal 11 side. Power input terminal 1
It is also possible to switch and select by flipping it to the 2 side. According to this circuit, changeover switch 1
By simply operating 7, you can switch between the 200V system and the 100V system.

(f) Effects According to the power supply device of the present invention, one simple power supply device consisting of a voltage limiter, a dummy resistor, and a Swiss tinder regulator is not subject to any restrictions on different AC voltages from different countries around the world. You can respond without any problems. Moreover, since there is no need to use a power transformer with many taps to accommodate the AC voltage of each country, the power supply device can be made smaller and lighter. It can be made lighter.

Of course, electronic equipment incorporating this power supply device can handle AC voltages from all over the world with just one power supply device, so there is no need to go to the trouble of preparing separate power supply devices for each country.

[Brief explanation of drawings]

Figures 1 and 2 are circuit connection diagrams showing a conventional power supply device;
FIG. 3 is a circuit connection diagram of a power supply device showing one embodiment of the present invention, FIG. 4 is a diagram showing a specific circuit connection example of a voltage limiter used in the power supply device of FIG. 3, and FIG. Furthermore, it is a figure which shows a part of the circuit connection diagram of the power supply device which shows another Example of this invention. 11: First AC power input terminal, 12: Second AC power input terminal, 13: Common terminal, 14 Switching regulator 15: Voltage limiter, 16: Dummy resistor, 17: Changeover switch, 18: AC Power input terminal, 19: common terminal patent applicant
Patent attorney representing Shimadzu Corporation
Shin Nakamura Shigeru-11:

Claims (2)

[Claims] (1) a first AC power input terminal, a common terminal, a switching regulator connected to the first AC power input terminal and the common terminal, a second AC power input terminal, and the first and second A power supply device consisting of a parallel connection circuit of a voltage limiter and a resistor connected between the AC power input terminals of. (2) The power supply device according to claim 1, wherein the first and second AC power input terminals are selectively connected to a common AC power input terminal via a changeover switch. .