JP2000250644A - Constant voltage output device and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a constant voltage output device which can freely obtain the optional output voltage. SOLUTION: This constant voltage output device consists of a power supply Vcc 1 which supplies the optional voltage and the 1st and 2nd variable resistances 2 and 3 which serve as two independent variable resistance elements. The optional voltage supplied from the supply l is divided by the resistances 2 and 3, and the constant voltage Vcont4 is outputted. the voltage Vcont4 is defined as Vcont4=(Rv2/(Rv1+Rv2))×Vcc when the resistance value of both resistances 2 and 3 are referred to as Rv1 and Rv2 respectively. In such a constitution, the optional output voltage can be freely obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant voltage output device and a method therefor, and more particularly, to a constant voltage output device capable of obtaining an arbitrary constant voltage output and a method therefor.

[0002]

2. Description of the Related Art As a conventional constant voltage output device, for example,
There is a "constant voltage output circuit" disclosed in Japanese Patent Application Laid-Open No. 10-228326. This constant voltage output circuit will be described with reference to FIG.

As shown in FIG. 4, a constant voltage output circuit includes a first bipolar transistor (BJT) 11,
A second bipolar transistor (BJT) 12;
, A second resistor 14, a third resistor 18,
And an operational amplifier 19. Hereinafter, the bipolar transistor is referred to as BJT.

[0004] The size of the second BJT 12 is the first BJT.
It is formed so as to be an integral multiple of the size of T11.
The first resistor 13 is a resistor having a resistance value of Rx. The emitter 15 of the first BJT 11 is connected to one terminal of the first resistor 13 and the other terminal is grounded. The second resistor 14 is a resistor having the same resistance value Rx as the first resistor 13, one terminal of the second resistor 14 is grounded, and the other terminal is a third resistor having another resistance value Ry. Connected to one terminal of resistor 18. The other terminal of the third resistor 18 is connected to the emitter of the second BJT 12. Operational amplifier 1
9, a (+) input terminal is connected to the terminal 16, a (-) input terminal is connected to the terminal 15, and an output terminal 17 is connected to the bases of the first BJT 11 and the second BJT 12 in common. You.

[0005] The conventional constant voltage output circuit having the above-described configuration is configured using bipolar transistors, so that the restriction on the manufacturing process can be relaxed and the setting range of the constant voltage output can be expanded.

[0006]

However, the method shown in the above-mentioned conventional example requires a bipolar transistor (BJT) requiring a special configuration and an auxiliary circuit as a configuration for obtaining a constant voltage, and a manufacturing process thereof. In the case where no bipolar transistor is used or the system cannot be used, the merit constituted by such a method is halved. Further, there is a problem that the influence of the cost on the bipolar transistor cannot be ignored.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a constant voltage output device capable of obtaining an arbitrary constant voltage output without using a bipolar transistor and a method therefor. The purpose is to:

[0008]

According to a first aspect of the present invention, there is provided a voltage supply means for supplying an arbitrary voltage and a voltage dividing means for dividing an arbitrary voltage supplied by the voltage supply means. And a voltage dividing means, wherein the voltage dividing means comprises a first variable resistor and a second variable resistor.

According to a second aspect of the present invention, in the first aspect of the present invention, a feedback value obtained by feeding back the voltage value supplied by the voltage supply means and the constant voltage value output by the constant voltage output device is used. It is characterized by having constant calculation means for calculating an arbitrary constant.

According to a third aspect of the present invention, in the second aspect of the present invention, first input means for inputting an arbitrary reference constant with respect to an arbitrary constant calculated by the constant calculating means, and input by the input means. Reference constant supply means for supplying the obtained reference constant to either the first variable resistance or the second variable resistance, and resistance value determination means for determining the resistance value of the variable resistance to which no reference constant is supplied by the reference constant supply means And the following.

According to a fourth aspect of the present invention, in accordance with the third aspect of the present invention, there is provided a semiconductor device, comprising: It has two input means, and can input a reference constant from any of the first input means and the second input means.

According to a fifth aspect of the present invention, there is provided a voltage supply step of supplying an arbitrary voltage, and a voltage divider for dividing an arbitrary voltage supplied in the voltage supply step by the first variable resistor and the second variable resistor. And a constant voltage output step of outputting the voltage divided by the voltage dividing step as a constant voltage.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, an arbitrary value is obtained by using a voltage value supplied in the voltage supply step and a feedback value obtained by feeding back the constant voltage output in the constant voltage output step. Characterized in that it has a constant calculation step of calculating the constant.

According to a seventh aspect of the present invention, in the invention of the sixth aspect, an input step of inputting an arbitrary reference constant for an arbitrary constant calculated in the constant operation step, and a reference input in the input step. Constant first
A reference constant supplying step of supplying the variable constant to the variable resistor or the second variable resistor, and a resistance value determining step of determining a resistance value of the variable resistor to which the reference constant is not supplied in the reference constant supplying step. And

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a constant voltage output device and a method thereof according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 1 to 3, there is shown an embodiment of a constant voltage output device and a method thereof according to the present invention.

FIG. 1 is a circuit diagram showing a configuration of a constant voltage output device according to a first embodiment of the present invention. In FIG. 1, a constant voltage output device according to a first embodiment of the present invention includes:
A power supply (Vcc) 1 for supplying an arbitrary voltage and a first variable resistor 2 and a second variable resistor 3 which are two independent variable resistor elements are configured.

The power supply (Vcc) 1 supplies an arbitrary voltage (for example, +5 V, +3.3 V, etc.). The first variable resistor 2 has a resistance value of Rv1, and one terminal is connected to a power supply (V
cc) 1 and the other terminal is connected to one terminal of the second variable resistor 3. The second variable resistor 3 is R
One terminal is connected to the first variable resistor 2 as described above, and the other terminal is grounded.

An arbitrary voltage (Vcc) supplied from the power supply 1 is divided by the following equation by the variable resistance values Rv1 and Rv2 of the first variable resistor 2 and the second variable resistor 3, respectively. The calculated value is the constant voltage output Vcont4. Vcont4 = (Rv2 / (Rv1 + Rv2)) × Vcc (1)

FIG. 2 is a circuit diagram showing a configuration of a constant voltage output device according to a second embodiment of the present invention. In FIG. 2, a constant voltage output device according to a second embodiment of the present invention includes:
It has a power supply 1 for supplying an arbitrary voltage, a first variable resistor 2 and a second variable resistor 3 which are two independent variable resistor elements, and is further connected to a constant operation circuit 5. .

The constant operation circuit 5 provides feedback of an arbitrary voltage (Vcc) supplied from the power supply 1 and a constant voltage output Vcont4 obtained as a result of voltage division by the first variable resistor 2 and the second variable resistor 3. Values are input, and their constants are calculated to generate an arbitrary constant.

The calculation by the constant calculation circuit 5 is performed by the above-described equation (1). Thus, the first variable resistor 2
The calculation result of the variable resistance value of the second variable resistor 3 becomes a constant for obtaining a desired constant voltage output Vcont4 with respect to the voltage value (Vcc) from the power supply 1 that supplies an arbitrary voltage. In other words, an arbitrary voltage value (Vc
By determining c) and the desired constant voltage output Vcont4, it is possible to freely combine the resistance values of the two variable resistors within a range satisfying this constant.

FIG. 3 is a circuit diagram showing a configuration of a constant voltage output device according to a third embodiment of the present invention. In FIG. 3, a constant voltage output device according to a third embodiment of the present invention includes:
A power supply 1 that supplies an arbitrary voltage, a first variable resistor 2 that is an independent variable resistor element, a second variable resistor 3, a constant operation circuit 5, and a variable resistance The value determination circuit 6 is connected and configured.

The variable resistance determining circuit 6 includes a constant calculating circuit 5
An arbitrary reference constant 7 is input to the arbitrary constant calculated by the formula (1), and the reference constant 7 is changed to one of the first variable resistor 2 and the second variable resistor 3 which are two independent variable resistance elements. To determine the value of the variable resistance element (either the first or second variable resistance) for which the above-described reference constant 7 has not been provided.

As described above, by giving one of the two variable resistors (the first variable resistor 2 and the second variable resistor 3) as the reference constant 7, the resistance values of the remaining variable resistors are changed. Can be uniquely determined.

For example, in FIG. 3, the variable resistance value determining circuit 6 sets the reference constant 7 supplied to the first variable resistance 2 to Rv1 ', and outputs an arbitrary voltage (Vcc) supplied from the power supply 1 and a constant voltage output. By giving Vcont4, the resistance value R of the second variable resistor 3, which is the remaining variable resistor, is obtained.
v2 ′ is uniquely determined.

The reference constant 7 described above is
Regardless of the case where the reference value is given to either the first variable resistor 2 or the second variable resistor 3, the resistance value of the variable resistor to which the reference constant 7 has not been given can be uniquely determined.

The input form of the arbitrary reference constant 7 is as follows.
It is built in a device having the above-described constant voltage output device, or provided with an external operation stage, and is input from the operation stage, or is input by both.

With the above configuration, the user can change the output voltage of the constant voltage output device for use, and the change procedure can be changed flexibly and freely.

As another embodiment of the present invention, as a method for supplying an arbitrary voltage (Vcc) supplied from the power supply 1 to a more stable voltage value, a voltage regulator or the like is provided in a preceding stage of the power supply 1. It is also possible.

The above-described embodiment is a preferred embodiment of the present invention, and various modifications can be made without departing from the spirit of the present invention.

[0031]

As is apparent from the above description, according to the constant voltage output device of the present invention, by dividing the voltage supplied from the power supply by two independent variable resistance elements, an arbitrary constant voltage output can be obtained. , An arbitrary output voltage can be obtained freely.

According to the constant voltage output device of the present invention,
An arbitrary constant is calculated by calculating an arbitrary voltage supplied from a power supply and a feedback value of a voltage value obtained by dividing the voltage by two independent variable resistance elements. Therefore, it is possible to obtain a resistance constant that uniquely determines a target voltage value for an arbitrary voltage value supplied from the power supply.

According to the constant voltage output device of the present invention,
An arbitrary reference constant is input to an arbitrary constant obtained by calculating an arbitrary voltage supplied from a power supply and a feedback value of a voltage value obtained by dividing the voltage by two independent variable resistance elements. By giving the reference constant to one of the two independent variable resistance elements, the resistance value of the other variable resistance element can be uniquely determined. Therefore, the resistance value of the variable resistance element can be freely changed.

Further, according to the constant voltage output device of the present invention, the input form of the reference constant can be set in the system provided with the constant voltage output device, or by providing an operation stage outside and by input from the operation stage, or Can be input by both. Therefore, the output voltage from the constant voltage output device can be easily changed, and the change procedure is flexible.
And it can be performed freely.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a configuration of a constant voltage output device according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a configuration of a constant voltage output device according to a second embodiment of the present invention.

FIG. 3 is a circuit diagram showing a configuration of a constant voltage output device according to a third embodiment of the present invention.

FIG. 4 is a circuit diagram showing a configuration of a conventional constant voltage output device.

[Explanation of symbols]

 Reference Signs List 1 power supply (Vcc) 2 first variable resistor 3 second variable resistor 4 constant voltage output (Vcont) 5 constant calculation circuit 6 variable resistance value determination circuit 7 reference constant

Claims (7)

[Claims] 1. A voltage supply means for supplying an arbitrary voltage; and a voltage division means for dividing the arbitrary voltage supplied by the voltage supply means, wherein the voltage division means is provided with a first variable resistor. A constant voltage output device comprising a second variable resistor. 2. Constant value calculation means for calculating an arbitrary constant using a voltage value supplied by the voltage supply means and a feedback value obtained by feeding back the constant voltage value output by the constant voltage output device. The constant voltage output device according to claim 1, wherein: 3. A first method for inputting an arbitrary reference constant with respect to an arbitrary constant calculated by the constant calculating means.
Input means, and a reference constant supply means for supplying the reference constant inputted by the input means to either the first variable resistor or the second variable resistor; and the reference constant supply means by the reference constant supply means. 3. The constant voltage output device according to claim 2, further comprising: a resistance value determining unit that determines a resistance value of the variable resistor that is not supplied. 4. It is provided outside the constant voltage output device,
A second input unit for inputting an arbitrary reference constant with respect to an arbitrary constant calculated by the constant calculation unit, wherein the reference constant is input from both the first input unit and the second input unit; 4. The constant voltage output device according to claim 3, wherein the constant voltage output device can be input. 5. A voltage supply step of supplying an arbitrary voltage, a voltage division step of dividing the arbitrary voltage supplied in the voltage supply step by a first variable resistor and a second variable resistor, A constant voltage output step of outputting, as a constant voltage, the voltage divided by the voltage division step. 6. A constant calculation step of calculating an arbitrary constant using a voltage value supplied in the voltage supply step and a feedback value obtained by feeding back the constant voltage output in the constant voltage output step. 6. The constant voltage output method according to claim 5, wherein: 7. An input step of inputting an arbitrary reference constant with respect to an arbitrary constant calculated in the constant calculation step, and inputting the reference constant input in the input step to the first variable resistor or the first variable resistor. A reference constant supply step for supplying the variable constant to any one of the variable resistors, and a resistance value determining step for determining a resistance value of the variable resistor to which the reference constant is not supplied in the reference constant supply step. Item 7. A constant voltage output method according to Item 6.