JPH06121446A - Output voltage automatic calibrating power unit - Google Patents

Abstract

PURPOSE:To obtain stable DC output voltage by providing an automatic calibrating output control circuit and an overvoltage detecting circuit. CONSTITUTION:After controlling an output by rectifying input voltage (AC voltage) in a primary side, a range of rated value is preset by a variable setter of output voltage, and automatic calibrating output control is actuated in this range, to control the output voltage. The rated value range can be set to the performance limit of a power unit, and at the time of output voltage out of the range, voltage of output control is interrupted by an overvoltage detecting circuit 4. Voltage is automatically output in the range of voltage arbitrarily set in an automatic calibrating output control circuit 3. Accordingly, the output voltage always in the rated value (arbitrarily set voltage) can be supplied in no relation to changing a load. In this way, stable DC output voltage can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an output voltage self-calibrating power supply unit attached to a computer system.

[0002]

2. Description of the Related Art Conventionally, the output voltage to be supplied needs to be adjusted to a range within the standard each time depending on the load on the demand side, and adjustment is performed by rotating the volume in the power supply device to the left or right. I checked the voltage with a measuring instrument and relied on visual inspection. Due to the rotation of the potentiometer, the output voltage was momentarily out of specification and stressed the load side.

[0003]

The present invention makes it possible to automatically calibrate within a range set within the standard and always supply a stable output voltage, and to supply an automatically calibrated output voltage regardless of increase or decrease of load. When the non-standard output voltage is supplied without the need for external readjustment, an output voltage auto-calibration power supply device that can protect the load side by shutting down the output voltage with a conventional overvoltage protection circuit to notify an alarm is provided. It is intended to be provided.

[0004]

According to the present invention, a primary side input voltage circuit for inputting an alternating current power source and an output side of the primary side input voltage circuit are connected, and the alternating current power source is rectified and converted into a direct current power source. Connected to the rectifier circuit and the output side of this rectifier circuit,
An output control circuit that controls the DC output voltage of the DC power supply and is connected to the output side of this output control circuit.The DC output voltage is compared with a predetermined DC set voltage, and the DC output voltage and DC An automatic calibration output control circuit that automatically calibrates and controls the DC output voltage so that the voltage difference from the set voltage becomes equal to or less than a predetermined allowable difference voltage, and outputs it as the secondary output voltage to the load side. And an overvoltage detection circuit that detects the secondary output voltage output from the calibration output control circuit and shuts off the output control circuit when the secondary output voltage exceeds a predetermined overvoltage set value. It is an output voltage automatic calibration power supply device.

[0005]

In the output voltage automatic calibration power supply device of the present invention, the AC power supply is input to the primary side input voltage circuit, the rectifying circuit is connected to the output side of the primary side input voltage circuit, and the AC power supply is rectified. Convert to DC power supply, connect the output control circuit to the output side of the rectifier circuit, control the DC output voltage of the DC power supply, connect the automatic calibration output control circuit to the output side of the output control circuit, and set the DC output voltage in advance. Compared with the specified DC set voltage, regardless of the increase or decrease of the load, the DC output voltage is automatically calibrated and controlled so that the difference voltage between the DC output voltage and the DC set voltage is equal to or less than the predetermined allowable difference voltage, The secondary side output voltage is output to the load side, the secondary side output voltage output from the automatic calibration output control circuit is detected, and the output control circuit is output when the secondary side output voltage exceeds a predetermined overvoltage set value. Shut off.

[0006]

EXAMPLE An example of the present invention will be described below. In FIG. 1, 6 is a primary side input voltage circuit for inputting an AC power source, 1
Is connected to the output side of the primary side input voltage circuit 6, a rectifier circuit for rectifying an AC power source and converting it into a DC power source, 2 is connected to the output side of the rectifier circuit 1, and controls the DC output voltage of the DC power source. The output control circuit 3 is connected to the output side of the output control circuit 2, compares the DC output voltage with a predetermined DC setting voltage, and determines the difference voltage between the DC output voltage and the DC setting voltage in advance regardless of increase or decrease of the load. The automatic calibration output control circuit 4 which automatically calibrates and controls the DC output voltage so as to be equal to or less than the specified allowable difference voltage and outputs it to the load 7 as the secondary side output voltage is output from the automatic calibration output control circuit 3. Is an overvoltage detection circuit that detects the secondary side output voltage and shuts off the output control circuit when the secondary side output voltage exceeds a predetermined overvoltage set value. The secondary side Dc output voltage can be arbitrarily set. , Automatically calibrate within that range and output Voltage is the output voltage autocalibration power supply in the range of stably supplying power supplies.

That is, after rectifying the input voltage (Ac voltage) on the primary side and controlling the output, the range of the standard value is set in advance by the output voltage setting variable device, and the automatic calibration output control is performed within the range. Operates and controls the output voltage. The range of the standard value can be up to the performance limit of the power supply device, and when the output voltage is out of the range, the overvoltage detection circuit 4 cuts off the output control voltage.

Then, the automatic calibration output control circuit 3 automatically outputs a voltage within a voltage range arbitrarily set. Therefore, an output voltage within the standard value (arbitrarily set voltage) can always be supplied regardless of increase / decrease in load. (Example: Rating: + 5V output voltage, set value: +4.90 to +5.10
V) There is no automatic calibration output control in the conventional dust-proof device, and it was necessary to readjust the rated output voltage by increasing or decreasing the load.

[0009]

According to the present invention, it is possible to obtain a stable DC output voltage.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an output voltage automatic calibration power supply device showing an embodiment of the present invention.

[Explanation of reference numerals] 1 rectifier circuit 2 output control circuit 3 automatic calibration output control circuit 4 overvoltage detection circuit

Claims (1)

[Claims] 1. A primary side input voltage circuit for inputting an AC power source, a rectifier circuit connected to an output side of the primary side input voltage circuit, for rectifying the AC power source and converting it to a DC power source, and the rectifier. An output control circuit connected to the output side of the circuit for controlling the DC output voltage of the DC power supply, and connected to the output side of the output control circuit, comparing the DC output voltage with a predetermined DC set voltage, and loading the load. The DC output voltage is automatically calibrated and controlled so that the difference voltage between the DC output voltage and the DC set voltage is equal to or less than a predetermined allowable difference voltage regardless of increase or decrease in An automatic calibration output control circuit that outputs a voltage and the secondary output voltage that is output from the automatic calibration output control circuit are detected, and if the secondary output voltage exceeds a predetermined overvoltage set value, Turn off the output control circuit An output voltage automatic calibration power supply device comprising an overvoltage detection circuit.