Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Reexamination Certificate
2000-07-07
2001-04-10
Vu, David (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
C315S219000, C315S224000, C315S278000
Reexamination Certificate
active
06215256
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a high-efficient electronic stabilizer with single stage conversion to solve low efficiency problem of traditional electronic stabilizers.
2. Description of the Related Art
FIGS. 3 and 4
of the drawings illustrates a conventional electronic stabilizer for sun lamps. A high frequency transformer with a high turn ratio and two transistors are combined to form a push-pull resonant stage
50
. Sine waves are generated by self-activation and then transformed by the high frequency transformer into high voltage/low current alternating voltage for activating the sun lamp
60
. Nevertheless, the current passing through the sun lamp (i.e., the brightness of the sun lamp) cannot be controlled. In front of the push-pull resonant stage
50
a power converter
80
is electrically connected in series to change the duty cycle of the transistors in the power converter
80
via control by a synchronous pulse width modulation controller
70
to adjust the current passing through the sun lamp
60
, thereby controlling the brightness of the sun lamp
60
.
Nevertheless, it is found that the efficiency of the above-mentioned stabilizer is poor, since the power must pass through the power converter
80
and the push-pull resonant stage
50
before it reaches the sun lamp
60
. Namely, there are two stages of energy loss such that the overall efficiency is only about 72% if the energy loss of each stage is about 85%. In addition, the power converter
80
is connected to the main loop in series such that the transistors in the power converter
80
must adopt high power/high current elements, which results in high cost and generates considerable amount of heat. Thus, heat dissipation problem occurs.
SUMMARY OF THE INVENTION
It is the primary object of the present invention to provide a high-efficient electronic stabilizer with single stage conversion to solve low efficiency problem of traditional electronic stabilizers. This object is achieved by changing the location of the converter such that the overall efficiency is increased to be about 84%, which is equal to a single stage conversion. The cost is low and the loss of heat energy is low.
It is another object of the present invention to provide a high-efficient electronic stabilizer with single stage conversion, in which the location of the converter is changed to a secondary winding side (the output side) of the high frequency transformer, thereby providing a single stage conversion between the power input end and the sun lamp and thus having single conversion loss. The overall efficiency is thus improved while using low-cost elements. In addition, the overheating problem is avoided.
It is a further object of the present invention to provide a high-efficient electronic stabilizer with single stage conversion, in which the internal structure thereof is largely changed in addition to the change in the location of the power converter. Two transistors are connected in inverted phase to form a bi-directional impedance converter with a switching frequency that is in synchronization with the push-pull resonant stage. In addition, the bi-directional impedance converter switches at a phase angle adjacent to zero degree (the so-called “zero switching”) such that the current passing through the sun lamp approaches sine waves, thereby improving the lighting efficiency. Furthermore, by means of a delicate design of a compensating capacitor, the output voltage and lamp current can be properly compensated to facilitate approaching of sine waves.
REFERENCES:
patent: 5747942 (1998-05-01), Ranganath
Ambit Microsystems Corporation
Pro-Techtor Inter-national Services
Vu David
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