Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Reexamination Certificate
1998-12-11
2001-04-17
Metjahic, Safet (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
26, C323S237000
Reexamination Certificate
active
06218853
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a circuit design for simulating an alternating current load, and more especially to an alternating current load simulating device capable of simulating a resistive load, an inductive load, or a capacitive load.
2. Description of the Prior Art
In the current industrial field, alternating current power source devices are frequently employed in electric devices. Various alternating current power source devices are currently available in the industry, such as an uninterrupted power supply, an inverter, a voltage regulator, an amplifier, etc. In order to test the electrical characteristics of the alternating current power supply, it is necessary to substantially connect electrical equipment, such as a lamp or a motor, to the power source device. Since various kinds of alternating current loads are necessarily prepared for being connected to the alternating current power source device, it is inconvenient and inefficient during testing.
In order to overcome the above problems of the prior art, an alternating current load simulating device is therefore developed to simulate the real electrical equipment. However, the circuit design of the prior art alternating current load simulating device is only suitable for testing the resistive load, such as a heater or a bulb lamp. Although some of the prior art alternating current load simulating devices are designed to have the capability of simulating an inductive or a capacitive load, a combination of real resistors, capacitors and inductors to get the desired electric load. The problem of this prior art is that it is not easy to get the load value exactly, and it is difficult to change or adjust the load value conveniently.
SUMMARY OF THE INVENTION
Accordingly, the primary object of the present invention is to provide a circuit design of an alternating current load simulating device which can be employed to simulate various alternating current loads including resistive, inductive, and capacitive load. The simulating device of the present invention is suitable to simulate a real electronic load for various alternating current power source devices, such as uninterrupted power supply, inverter, voltage regulator, amplifier, and other alternating current power source devices.
Another object of the present invention is to provide an alternating current load simulating device with different load type adjustable by the user as desired. The simulating device comprises a switch circuit, a rectifying circuit, a voltage to current converting circuit, a voltage zero-crossing detecting circuit, a current waveform generating circuit, a current phase setting circuit, a current level adjusting circuit
71
, a current level setting circuit
71
, and a voltage and current phase control circuit. In addition to the simulation of resistive, inductive, and capacitive load, the present invention is also suitable to simulate any loads with different electrical features, such as an electrical composite load with inductive and capacitive features. The power factor controllable by the present invention is within a range of −1.000~0~+1.000.
The present invention will be better understood and its numerous objects and advantages will become apparent to those skilled in the art by referencing to the following drawings in which:
REFERENCES:
patent: 5103390 (1992-04-01), Liu
patent: 5994883 (1999-11-01), Liu
Dougherty & Troxell
Kerveros J.
Metjahic Safet
LandOfFree
Circuit arrangement for simulating alternating current load does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Circuit arrangement for simulating alternating current load, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit arrangement for simulating alternating current load will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2530657