Patent Application
20140103956
1. Technical Field
The present disclosure relates to detection circuits and methods, and particularly to a power supply detection circuit and method.
2. Description of Related Art
A number of properties should be tested and verified before a power supply is shipped. Especially a load response detecting a sudden load connection of the power supply to the load from the sudden rise in current. Currently a current rising rate of a testing circuit currently is not quick enough to accurately test and verify the response of the power supply. Therefore, there is room for improvement in the art.
Many aspects of the embodiments can be better understood with reference 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.”
The to-be-tested power supply unit 100 includes an input end 101 and an output end 102.
The controller 200 includes a power module 10, a controlling module 20, a signal module 30, and a detection module 50.
The power module 10 connects to the input end 101 via the voltage-stabilizing circuit 300, to input a stable input voltage.
The controlling module 20 connects to the signal module 30 and is used for controlling the signal module 30 to generate a plurality of pulse signals with different duty cycles or different frequencies. The parameters of the plurality of pulse signals are combinations of each of the different duty cycles and each of the different frequencies. In one embodiment, the different duty cycles are 25/75, 50/50, and 75/25, the different frequencies are 1 KHz, 10 KHz, 100 KHz, and 1 MHz, and the parameters of the plurality of pulse signals are 25/75 duty cycle, and 1 KHz frequency; 25/75 duty cycle, and 10 KHz frequency; 25/75 duty cycle, and 100 KHz frequency; 25/75 duty cycle, and 1 MHz frequency; 50/50 duty cycle, and 1 KHz frequency; 50/50 duty cycle, and 10 KHz frequency; 50/50 duty cycle, and 100 KHz frequency; 50/50 duty cycle, and 1 MHz frequency; 75/25 duty cycle, and 1 KHz frequency; 75/25 duty cycle, and 10 KHz frequency; 75/25 duty cycle, and 100 KHz frequency; and 75/25 duty cycle, and 1 MHz frequency. Each of the plurality of pulse signals keeps a fixed time. In one embodiment, the fixed time is 30s.
The MOSFET 600 includes a gate terminal G, a drain terminal D, and a source terminal S.
A first end of the resistor 500 connects to the output end of the to-be-tested power supply unit 100. A second end of the resistor 500 connects to the drain terminal D. In one embodiment, the resistor 500 is a cement resistor. The resistor 500 can be composed of multiple cement resistors in parallel according to need.
The source terminal S is grounded.
The gate terminal D connects to the signal module 30, to receive the plurality of pulse signals from the signal module 30. The MOSFET 600 is turned on when the pulse signals are high level and turned off when the pulse signals are low level. When the MOSFET 600 is turned on, the to-be-tested power supply unit 100 electronically connects the resistor 500. A circuit is defined by the voltage-stabilizing circuit 300, the to-be-tested power supply unit 100, the resistor 500, and the controller 200, and the circuit generates a fast-rising dynamic current.
The output end 102 of the to-be-tested power supply unit 100 connects the detection module 50, to feedback an output voltage to the detection module 50. The detection module 50 detects the output voltage in real time and displays the output voltage in a display (not shown) to confirm whether the output voltage is equal to the input voltage.
Step S10: the power module 10 supplies the input voltage to the input end of the to-be-tested power supply unit 100.
Step S20: the controlling module 20 drives the signal module 30 to generate the plurality of different pulse signals.
Step S30: the MOSFET is turned on when each of the plurality of different pulse signals is in a high level, and the output end of the to-be-tested power supply unit connects a resistor and generates a fast-rising current.
Step S40: the detection module 50 detects an output voltage of the output end of the to-be-tested power supply unit 100 to confirm whether the output voltage is equal to the input voltage.
Each of the plurality of different pulse signals has a different duty cycle or different frequency from other pulse signals. Each of the plurality of different pulse signals keeps a same time. In one embodiment, the keeping time is 30s. The step S20 includes that the controlling module 20 decides whether the keeping time of one of the plurality of different pulse signals is 30s. If yes, the controlling module 20 controls the signal module 30 to generate a next pulse signal. If no, the controlling module 20 controls the signal module 30 to keep the current pulse signal.
It is to be understood, however, that even though numerous characteristics and advantages have been set forth in the foregoing description of embodiments, together with details of the structures and functions of the embodiments, the disclosure is illustrative only and changes may be made in detail, especially in the matters of shape, size, and the 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 |
|---|---|---|---|
| 101138021 | Oct 2012 | TW | national |
