JPH09219475A - Electric cooling element power supply circuit - Google Patents

Abstract

(57) Abstract: A power supply circuit that consumes less power to a plurality of electronic cooling elements is provided. An electric power supplied from an original power source is supplied to other devices or circuits via an electronic cooling element feeding circuit in which a part or all of a plurality of electronic cooling elements are connected in parallel.
The current flowing through the electronic cooling element is controlled by the electronic cooling element current control circuit, and the characteristic deviation of each electronic cooling element is corrected by the current limiting resistance connected in series with the electronic cooling element.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic cooling element feeding circuit in an apparatus using a plurality of electronic cooling elements (Peltier elements).

[0002]

2. Description of the Related Art FIG. 2 shows an example of a conventional electronic cooling element power supply circuit which uses a plurality of electronic cooling elements and supplies electric power to other devices or circuits after passing through the electronic cooling elements. In the figure, 1 is an electronic cooling element, 2 is a current controller, 3 is an original power-on terminal, and 4 is a current output terminal to another circuit.

The current supplied from an unillustrated source power source is
Thermoelectric cooler 1 and current control circuit 2 connected in series
And is supplied to other devices or circuits. The current that does not need to flow through the electronic cooling element 1 passes through the current control circuit 2.

Here, for example, if the current flowing through the electronic cooling element 1 is 200 mA and the current required to flow through a circuit (not shown) in the subsequent stage is 700 mA, the current flowing through the current controller 2 is 500 mA.

[0005]

In the conventional method of connecting electronic cooling elements in series, when the current consumption of the circuit or equipment connected to the secondary side of the electronic cooling element feeding circuit is large,
The current flowing through the electronic cooling element current control circuit increases,
Further, since the voltage across both terminals is increased in proportion to the number of electronic cooling elements, there is a drawback that the power consumption is further increased.

An object of the present invention is to solve this drawback and reduce power consumption.

[0007]

In order to achieve the above-mentioned object, the present invention connects a part or all of a plurality of electronic cooling elements in parallel so that the electric power of the current control circuit of the electronic cooling element is increased. It will be reduced.

With such a circuit configuration, the power consumption of the electronic cooling element feeding circuit can be reduced.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the circuit diagram of FIG.

In the figure, 5 is a current limiting resistor and 6 is a current controller. Other reference numerals are the same as those in FIG.

The current input from the source power input terminal 3 is supplied to another device or circuit (not shown) via the electronic cooling element power supply circuit 6. By connecting the electronic cooling elements 1 in parallel, the current is shunted to the electronic cooling elements 1 and the electronic cooling element current control circuit 6.

The characteristic deviation of each electronic cooling element is corrected by the current limiting resistor 5 connected in series with each electronic cooling element.

For example, if the electric current flowing through one thermoelectric cooling element 1 is 200 mA, the electric current flowing through the current controller 6 is 100 mA, and the electric current flowing through the current control unit 6 is 100 mA.

That is, the current flowing through the current controller is 400 mA less than that of the conventional example. As a result, the power consumption of the current controller can be significantly reduced.

[0015]

As described above, according to the present invention, the power consumption of the current controller can be greatly reduced with a simple circuit configuration.

[Brief description of drawings]

FIG. 1 is a configuration block diagram of a power supply circuit circuit of an electronic cooling element showing an embodiment of the present invention.

FIG. 2 is a block diagram of a power supply circuit for a thermoelectric cooler showing a conventional circuit configuration.

[Explanation of symbols]

1 electronic cooling element, 2, 6 electronic cooling element current control unit,
3 power input, 4 output to other equipment or circuit, 5 current limiting resistor.

Claims (1)

[Claims] 1. An electronic cooling element power supply circuit, comprising a plurality of electronic cooling elements, wherein a plurality of electronic cooling elements are connected to each other to supply electric power to another device or circuit via the electronic cooling elements. Connecting a plurality of the electronic cooling elements and an electronic cooling element circuit composed of a current limiting resistor connected in series with the electronic cooling element in parallel, and connecting a current controller in parallel with the electronic cooling element circuit. A power supply circuit for a thermoelectric cooler.