JPH04285429A - Parallel operation current control circuit - Google Patents

Abstract

PURPOSE:To facilitate temperature compensation of an output current in an output current balancing constant voltage power source which performs parallel operation current control. CONSTITUTION:By using a thermosensitive resistor for the resistor 1 or 2 being connected by a current feedback circuit 3, the current feedback signal being given to a pulse control circuit 5 by temperature is increased or decreased, and the temperature compensation to the balancing of the output current is sought. In the parallel operation of a plurality of output current balancing constant voltage power source, the inequality of the output currents caused with the temperature difference between respective power sources is prevented and also the reliability is improved.

Description

[Detailed description of the invention]

0001

TECHNICAL FIELD The present invention relates to a parallel operation current control circuit for temperature compensation.

0002

2. Description of the Related Art A conventional parallel operation current control circuit will be explained with reference to FIG.

Referring to FIG. 2, a conventional parallel running current control circuit includes a main circuit 6 having input terminals 8 and 9 and output terminals 12 and 13, and a voltage feedback circuit 4 connected to the output of the main circuit 6. , and a pulse control circuit 5 and a current feedback circuit 3 connected to the voltage feedback circuit 4. Furthermore, another output current balanced type constant voltage power supply having input terminals 10 and 11 and output terminals 14 and 15 is provided.

[0004] In such a circuit, no attempt has been made to suppress fluctuations in the output current due to changes in the characteristics of the control circuit due to temperature. That is, in such a circuit, the output current varies depending on the temperature, and when a plurality of output current balanced type constant voltage power supplies are operated in parallel, the output power of each power supply does not become constant depending on the temperature condition. Therefore, there is a drawback that the output current cannot be shared equally.

[0005]

OBJECT OF THE INVENTION The object of the invention is to eliminate the above-mentioned drawbacks and to
An object of the present invention is to provide a parallel operation current control circuit that suppresses fluctuations in output current due to temperature differences between power sources and improves reliability.

[0006]

According to the present invention, there is provided a voltage feedback circuit that generates an error amplified signal between the output voltage of a main circuit and a reference voltage as a voltage feedback signal, and outputs a current feedback signal that is proportional to the output current of the main circuit. a first resistor having one end connected to the current feedback circuit; and a second resistor having one end connected to the other end of the first resistor and the other end connected to a ground terminal. The voltage feedback circuit is connected to a connection line between the other end of the first resistor and one end of the second resistor, and at least one of the first resistor and the second resistor is connected to the voltage feedback circuit. A parallel operation current control circuit characterized in that one side is a temperature-sensitive resistor is obtained.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, one embodiment of the present invention includes:
a main circuit 6 having input terminals 8 and 9 and output terminals 12 and 13; a current feedback circuit 3 connected to the main circuit 6 and outputting a current feedback signal proportional to the output current of the main circuit 6; and the main circuit. 6 output terminal 1
2 and 13 and amplifies the error between the output voltage of the main circuit 6 and the reference voltage to output a voltage feedback signal; a resistor 1 connected to the current feedback circuit 3; A temperature-sensitive resistor 2 connected to the resistor 1 and the ground, and a pulse control circuit 5 that performs pulse control using a composite signal of each signal from the temperature-sensitive resistor 2, the resistor 1, and the voltage feedback circuit 4. include.

This embodiment operates in parallel with another output current balanced type constant voltage power supply 7.

When the output current balanced type constant voltage power supply 7 causes a decrease in output current as the temperature rises, the resistivity of the temperature sensitive resistor 2 increases. Due to this increase in resistivity, the composite signal given to the pulse control circuit 5 increases, and the increase in output current is suppressed by pulse control.

On the other hand, when the output current balanced constant voltage power supply causes a decrease in output current as the temperature rises, by replacing resistor 1 with a temperature sensitive resistor and replacing temperature sensitive resistor 2 with a resistor, A similar operation as described above can suppress a decrease in output current.

0012

[Effects of the Invention] The present invention compensates for the temperature of the output current, so when multiple output current balanced type constant voltage power supplies are operated in parallel, fluctuations in the output current due to temperature differences between the power supplies caused by temperature conditions can be suppressed. This has the effect of deterring and improving reliability.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a conventional circuit.

[Explanation of symbols]

1 Resistor 2 Temperature sensitive resistor 3 Current feedback circuit 4 Voltage feedback circuit 5 Pulse control circuit 6 Main circuit

Claims (1)

[Claims] 1. A voltage feedback circuit that generates an error amplification signal between an output voltage of a main circuit and a reference voltage as a voltage feedback signal, and a current feedback circuit that outputs a current feedback signal proportional to an output current of the main circuit. a first resistor having one end connected to the current feedback circuit; and a second resistor having one end connected to the other end of the first resistor and the other end connected to a ground terminal, The voltage feedback circuit is connected to a connection line between the other end of the resistor and one end of the second resistor, and at least one of the first resistor and the second resistor is connected to a temperature sensitive resistor. A parallel operation current control circuit characterized by: