Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of electrically operated apparatus
Reexamination Certificate
2002-01-22
2004-01-06
Hirshfeld, Andrew H. (Department: 2854)
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of electrically operated apparatus
C324S512000, C324S522000, C324S523000, C324S527000, C324S528000, C324S529000
Reexamination Certificate
active
06674290
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method and system for multi-port synchronous high voltage testing, especially to a method and system using two or more independent high voltage generator to perform multi-port high voltage testing on an object under test.
2. Description of the Prior Art
Refer to
FIG. 1
,
FIG. 1
is a block diagram showing a conventional test system for multi-port high voltage scanning, which comprises a high voltage generator
12
and a current detector
13
. At present, when manufacturers perform a high voltage testing on electric parts or products, if the object has a primary portion
21
, a case
22
, and secondary portion
23
, wherein the potentials of the secondary portion
23
and the case
22
are different, the primary portion
21
will be requested to be tested in high voltage to the secondary portion
23
, high voltage turned out at floated case
22
frequently put operators under risk of electric shock by exposure to case
22
. At the same time, the floating voltage of case
22
resulted from the voltage division effect of internal impedances for the primary portion-to-case and the case-to-secondary portion frequently cause electric products damage due to poor withstand voltage caused by the different designing conditions.
Furthermore, the conventional multi-port high voltage scanning test system
1
needs to use high voltage switching circuit
11
to perform high voltage testing of the primary portion-to-case, the secondary portion-to-case, and the primary portion to the secondary portion. Therefore, at least three tests are necessary to complete tests on objects under test, the total test is difficult to control total test time required.
Seeing the inefficiency of testing via conventional system awaiting urgent improvement, the inventor has invested prolong thinking and research effort on the subject and finally developed the method and system for multi-port synchronous high voltage testing.
SUMMARY OF THE INVENTION
An object of present invention is to provide a method and system for multi-port synchronous high voltage testing, so that it is possible to prevent operators from electric shock caused by unintentionally touching floating ground of the tested object during high voltage testing and to ensure the safety of the operator. Another object of present invention is to provide a method and system for multi-port synchronous high voltage testing, so that it is possible to prevent the electric product from poor withstand voltage caused by voltage division effect of conditional voltage distribution during a floating test.
Yet another object of present invention is to provide a method and system for multi-port synchronous high voltage testing, so that it is possible to complete a three-time high voltage testing in a single test period via a synchronous testing, and the test time is effectively reduced to one third of that required in prior art.
A method and system for multi-port synchronous high voltage testing, which mainly uses two or more sets of testing circuit with variable output condition and a high voltage generator with zero intermediate voltage for synchronous high voltage testing, wherein said testing circuit comprises a plurality sets of individual high voltage generator and a current detector for providing functions for reading and determining individual voltage and current, so that it is possible to perform several high voltage tests during a single test period and complete the product test.
DETAILED DESCRIPTION OF THE INVENTION
Refer to
FIG. 2
,
FIG. 2
is a block diagram showing a circuit for multi-port synchronous high voltage testing
3
according to the present invention. The present invention uses two independent sets of high voltage generator as voltage controlling output devices, wherein the intermediate voltage between high voltage generator A
31
and current detector A
32
and between high voltage generator B
34
and current detector B
35
are of compulsory zero-volt, so that it is possible to ensure the safety of operators. In AC mode, said two independent sets of high voltage generator have a feature of independently and individually controlled voltage magnitude and opposite phases, i.e. a phase difference of 180 degree; while in DC mode, said two independent sets of high voltage generator have a feature of independently and individually controlled voltage magnitudes and positive and negative voltage outputs respectively, i.e. one voltage with polarity opposite to the other.
In order to improve consecutive multi-time testing in prior art for simultaneous multi-port testing, the present invention has change of the output conditions: a primary loop with independent voltage V
1
consisted of a high voltage generator A
31
, a current detector A
32
, and a primary portion
33
of object under test; a secondary loop with independent voltage V
2
consisted of a high voltage generator B
34
, a current detector B
35
, and a secondary portion
36
of object under test; a zero-potential loop with independent voltage V
3
which is a loop from product case
37
to zero-potential(intermediate voltage); such that except the function of the high voltage generator, in AC mode, the current detector detects current flow through object under test, due to high voltage generator A
31
and high voltage generator B
34
opposite in phase, the current detector synchronously detect current flow from high voltage generator B
34
via object under test to high voltage generator A
31
, thus in case of having independent voltage in each loop, both current reading and determining may fulfill the safety specification in tests request for independent voltage and current reading and determination.
Therefore as described above, when performing high voltage testing on electric parts or products equipped with primary portion, case, and secondary portion for the secondary portion and the case of different potentials, said circuit may complete three high voltage testing of primary-to-case, secondary-to-case, and primary-to-secondary on electric product or tested object within a single test period.
For further emphasize, said testing circuit uses a plurality sets of high voltage generators and a current detector to provide functions for reading and determining of independent voltage and current, so as to perform several high voltage tests during a single test period, while reducing test time and protecting operators.
FEATURS AND EFFECTS
The present invention has provided a circuit for multi-port synchronous high voltage testing with the following advantages:
1. To ensure that tested product has no poor withstand voltage caused by voltage division.
2. To effectively save test time for manufacturer seriously about shipment schedule to have absolute controllability.
3. To provide a technique that is not familiar to those skilled in prior art but very inventive.
To summary from above, the present invention is an unpublic novel technique with industry applicability and improvement, which can comply with the criteria specification of patent law.
However, above mentioned is simply a preferred embodiment that is not intended to be the limit of the invention, and various change, equivalence and modification without departing from the claim must be considered within the scope and spirit of the invention.
REFERENCES:
patent: 3754221 (1973-08-01), Stelter
patent: 3913010 (1975-10-01), Scarpino
patent: 3934176 (1976-01-01), Vasudevan et al.
patent: 4209741 (1980-06-01), Coby et al.
patent: 4542302 (1985-09-01), Griffioen
patent: 5729145 (1998-03-01), Blades
patent: 5796259 (1998-08-01), Dickmander
patent: 5995588 (1999-11-01), Crick
patent: 6265881 (2001-07-01), Meliopoulos et al.
Bucknam and Archer
Chroma ATE Inc.
Hamdan Wasseem M.
Hirshfeld Andrew H.
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