Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2000-06-30
2001-04-17
Han, Jessica (Department: 2838)
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
C363S059000
Reexamination Certificate
active
06218818
ABSTRACT:
BACKGROUND OF THE INVENTION
(a) Field of the Invention
The present invention relates to a direct current (DC) power apparatus. More specifically, the present invention relates to a highly efficient DC power apparatus using a capacitor.
(b) Description of the Related Art
DC—DC converters convert a predetermined level of the DC voltage into another level of the DC voltage. The converter comprises a transformer including a first and a second winding wound on a magnetic core. By opening and closing a first circuit at a predetermined interval, the energy transfer between the first and the second windings can be controlled.
In the DC power apparatus industry, concerns for converters with small size, high energy efficiency, and high performance have recently increased. Also, slim portable devices using batteries are being developed as the technology develops.
FIG. 1
shows a conventional DC power apparatus using an inductor.
Referring to
FIG. 1
, an integrated circuit IC
1
operating as a step-up DC power device boosts a battery voltage to a voltage required by a first terminal T
1
. A problem caused by this circuit is that the resisting pressure of the capacitor C
1
must be greater than the voltage required by the first terminal T
1
.
Most devices supply the power to be used in the electronic circuits from the battery by using the step-down or step-up DC—DC converters. If the circuit being used requires a power greater than the battery voltage, the step-up converter must be used.
However, the DC power apparatus using this inductor generates noise, and in the case of wireless devices, these noises greatly lower the performance of the apparatus. In the case of using a power greater than the battery voltage and needing much current, the performance of the DC power apparatus greatly varies according to the amount of the current used. In the case of the portable devices, these kinds of circuits are in standby mode most of the time when in use, and the efficiency at this time becomes much lower.
In a conventional boost circuit using an inductor, frequency spectra caused by switching noises affect the operation of radio frequency (RF) or intermediate frequency (IF) parts. Since the boost circuit uses a method whereby it is connected to the battery in parallel, a voltage as high as the desired output voltage is needed.
Also, because the conventional method uses a switching method using an inductor, the conversion efficiency greatly varies depending to the output current.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a DC power apparatus using a capacitor for supplying a DC voltage greater than the DC voltage supplied by the battery by using a large capacity capacitor and a battery.
In one aspect of the present invention, a DC power apparatus using a capacitor comprises: a battery having one end grounded and outputting a first DC voltage; a first capacitor connected to another end of the battery and a load, and outputting a second DC voltage boosted higher than the first DC voltage; and a charge controller detecting the voltage at another end of the first capacitor, and that when the detected voltage is below a predetermined level, charges a built-in second capacitor with the first DC voltage and transfers the energy stored in the second capacitor to the first capacitor according to a predetermined switching operation, and when the detected voltage is equal to or greater than the predetermined level, stopping a magnetic oscillation.
The charge controller comprises: a voltage detector detecting a charge voltage level of the first capacitor; a magnetic oscillator, that when the detected voltage of the voltage detector is below a predetermined level, performs a magnetic oscillation, and when the detected voltage of the voltage detector is equal to or greater than a predetermined level, stops the magnetic oscillation; a second capacitor; and a switch, connected to the second capacitor, transferring the first DC voltage stored in the battery into the second capacitor according to ON/OFF operations according to the oscillation operation of the magnetic oscillator, and when the magnetic oscillator is not oscillating, charging the first DC voltage charged to the second capacitor into the first capacitor.
The switch comprises: a first switch being switched to ON according to the oscillation operation of the magnetic oscillator, charging the first DC voltage stored in the battery into the second capacitor, and switching to OFF according to the non-oscillation operation of the magnetic oscillator thereby stopping the charging operation of the second capacitor; and a second switch being switched to OFF according to the oscillation operation of the magnetic oscillator, and being switched to ON according to the non-oscillation operation of the magnetic oscillator so as to charge the voltage charged to the second capacitor into the first capacitor.
REFERENCES:
patent: 3955353 (1976-05-01), Astle
patent: 5737204 (1998-04-01), Brown
Alston & Bird LLP
Han Jessica
Jtel Co., Ltd.
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