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Power circuit

A technology of power supply circuit and power supply voltage, which is applied in the direction of adjusting electric variables, control/regulation systems, instruments, etc., and can solve the problems that it is difficult to eliminate the change of power supply voltage and realize it.

Inactive Publication Date: 2003-10-01
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In terms of eliminating this effect, there is an idea that a voltage affected by temperature change is intentionally generated on the terminal 10, and the amount of change is offset to the amount of change in the temperature characteristic of the power supply transistor 11, but it is difficult to realize in practice.
[0009] Therefore, it is difficult to eliminate the fluctuation of the power supply voltage caused by the temperature change

Method used

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Embodiment Construction

[0015] Below, refer to figure 1 A power supply circuit according to an embodiment of the present invention will be described.

[0016] 16 is a voltage dividing resistor composed of resistor 17 and resistor 18. 19 is a switch that is opened and closed by a control signal from the terminal 20 . 21 is a differential amplifier, the emitter voltage of the power supply transistor 11 is applied to one input terminal 22 , the voltage of the voltage dividing resistor 16 is applied to the other input terminal 23 , and the output signal thereof is applied to the buffer circuit 9 . again, in figure 1 in, right with figure 2 The same structural parts are assigned the same reference numerals, and descriptions thereof are omitted.

[0017] Explained below figure 1 work of the circuit. There is a terminal 2 outside the integrated circuit 1 for applying a power supply voltage of, for example, 11V, and the power supply voltage is applied from the terminal 2 to the inside of the integra...

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Abstract

The power supply transistor (11) has the inherent temperature characteristics of discrete components, and the voltage between the base and the emitter fluctuates, so it cannot supply a fixed-level power supply voltage. Therefore, there is provided a power supply circuit comprising: a constant voltage element that generates a constant voltage even if the temperature varies; a power supply transistor that applies an output voltage of the constant voltage element to a base and supplies a power supply voltage from an emitter; a load connected to to the emitter of the power supply transistor; and a differential amplifier that applies the emitter voltage of the power supply transistor to one input terminal, and applies a voltage corresponding to the output voltage of the constant voltage element to the other input terminal, converting it The output signal is applied to the base of the power transistor.

Description

technical field [0001] The present invention relates to a power supply circuit for supplying a power supply voltage to the inside of an integrated circuit, and more particularly to a power supply circuit capable of supplying a constant voltage level regardless of changes in ambient temperature. Background technique [0002] Generally, the characteristics of transistors, resistors, etc. inside an integrated circuit change due to changes in ambient temperature, and it is difficult to generate a constant voltage. Therefore, a constant voltage is obtained using an element such as a Zener diode that is not easily affected by temperature changes. [0003] In addition, a large current of, for example, 100 mA to 200 mA flows through a power supply transistor that supplies current to a power supply line of an integrated circuit. Since it is difficult to build a power supply transistor through which such a large current flows in an integrated circuit, a power supply transistor for po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/567G05F1/46G05F3/22
CPCG05F1/46
Inventor 中岛宪一大泽郁郎
Owner SANYO ELECTRIC CO LTD