CIRCUIT FOR DETECTING CAPACITANCE ATTENUATION OF RECTIFICATION/FILTER CAPACITOR AND METHOD THEREOF
First Claim
1. A circuit for detecting capacitance attenuation of a rectification/filter capacitor, comprising:
- at least one capacitor receiving a rectified ripple voltage;
a back-up power supply device connected with the capacitor and supplying power in detecting the capacitor;
a detection circuit connected with one side of the capacitor and including at least one detection switch and at least one resistor connected in series; and
an isolation device arranged between and connected in series with the back-up power supply device and output of the capacitor and detection circuit, and used to prevent the back-up power supply device from discharging electricity to the capacitor and the detection circuit.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention discloses a circuit for detecting capacitance attenuation of a rectification/filter capacitor and a method thereof. A rectification circuit provides a capacitor with a rectified ripple voltage having a maximum lower than output voltage of a back-up power supply device. An isolation device isolates the rectified ripple voltage and let the back-up power supply device supply power to other power supply devices. The detection switch of an detection circuit is turned on to electrically connect the capacitor with a resistor, whereby the resistor conducts the rectified ripple voltage to charge and discharge the capacitor to obtain a peak-to-valley ratio and a discharging time. The capacitance is worked out from the peak-to-valley ratio, discharging time and resistance of the resistor. The deterioration extent of the capacitor is obtained from the variation of the capacitance. Therefore, the UPS system would not be shut off during detecting the capacitor.
7 Citations
9 Claims
-
1. A circuit for detecting capacitance attenuation of a rectification/filter capacitor, comprising:
-
at least one capacitor receiving a rectified ripple voltage; a back-up power supply device connected with the capacitor and supplying power in detecting the capacitor; a detection circuit connected with one side of the capacitor and including at least one detection switch and at least one resistor connected in series; and an isolation device arranged between and connected in series with the back-up power supply device and output of the capacitor and detection circuit, and used to prevent the back-up power supply device from discharging electricity to the capacitor and the detection circuit. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A method for detecting capacitance attenuation of a rectification/filter capacitor, comprising steps of
supplying a rectified ripple voltage to a capacitor and a detection circuit, wherein the rectified ripple voltage has a maximum lower than a voltage of a back-up power supply device, whereby the back-up power supply device is isolated from the rectified ripple voltage by an isolation device and takes over to supply power; - and
the detection circuit conducting the rectified ripple voltage through a resistor to charge and discharge the capacitor to generate a peak-to-valley ratio and a discharging time, and working out a capacitance of the capacitor through the peak-to-valley ratio, the discharging time and a resistance of the resistor. - View Dependent Claims (7, 8, 9)
- and
Specification
-
- Resources
-
Current AssigneeEneraiser Technology Co., Ltd.
-
Original AssigneeEneraiser Technology Co., Ltd.
-
InventorsHUANG, Jui-Kun
-
Application NumberUS12/941,649Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current324/659CPC Class CodesG01R 31/64 Testing of capacitorsH02H 7/16 for capacitors for synchron...
