Patent Application
20110156744
1. Technical Field
The present disclosure relates to voltage generating devices, and particularly to a linear voltage generating device for testing performance of a power supply.
2. Description of Related Art
Most electronic apparatuses are not equipped with internal power supply devices in order to save space and costs. Therefore, these electronic apparatuses require external power supplies. Computers are powered by power supplies, which are capable of converting alternating current into direct current. The reliability of power supplies is tested by comparing the input and output voltages of the power supplies. Over-current protection is an important test for determining the reliability of power supplies. The test is done by gradually increasing the output currents of the power supply and checking if they are within allowable limits. However, the above testing method requires manual adjustment of resistance of the load electrically coupled to the power supply and does not allow for accurate linear adjustment.
Therefore, there is room for improvement within the art.
Many aspects of the embodiments can be better understood with references to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.
The disclosure is illustrated by way of example and not by way of limitation in the figures of the accompanying drawings in which like references indicate similar elements. It should be noted that references to “an” or “one” embodiment in this disclosure are not necessarily to the same embodiment, and such references mean at least one.
Referring to
Referring to
The A/D conversion circuit 200 includes resistors R2, R3, and capacitors C1, C2. The resistor R2 first terminal is electrically coupled to the amplifier A1 output terminal. The resistor R2 second terminal is electrically coupled to the resistor R3 and capacitor C1 first terminals. The resistor R3 second terminal is grounded via the capacitor C2. The capacitor C1 second terminal is grounded. A connection point between the resistor R3 and the capacitor C2 is capable of outputting the linear digital signal.
The amplifier circuit 300 includes an amplifier A2 and a resistor R4. The amplifier A2 non inverting input terminal is electrically coupled to the connection point between the resistor R3 and the capacitor C2. The amplifier A2 inverting input terminal is electrically coupled to the amplifier A2 output terminal via the resistor R4. The amplifier A2 output terminal is grounded via a capacitor C3. The amplifier A2 output terminal is capable of outputting the amplified linear digital signal. The signal input and output terminals 10, 20 are grounded. The signal output terminal 20 is capable of being coupled to an electric load (not shown). The electric load is capable of being coupled to the power supply.
In operation, the signal input and output terminals 10, 20 are electrically coupled to the generating device as shown in
It is to be understood, however, that even though numerous characteristics and advantages of the embodiments have been set forth in the foregoing description, together with details of the structure and function of the embodiments, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the disclosure to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
| Number | Date | Country | Kind |
|---|---|---|---|
| 200910312237.2 | Dec 2009 | CN | national |
