US006366063B1
(12) United States Patent
(10) Patent N0.:
US 6,366,063 B1
(45) Date of Patent:
Apr. 2, 2002
Sekii
(54)
CIRCUIT AND METHOD FOR DRIVING
6,072,447 A
CAPACITIVE LOAD
(75)
IHVGIIIOI‘Z
Yoshizumi Sekii, TOkyO (JP)
(73) Assignee: NEC Corporation (JP)
*
N'
ot1ce:
Flled:
(30)
6/2000 Noborio .................... .. 345/60
JP
61-132997
6/1986
.......... .. 6096/3/30
JP
10-11019
1/1998
.......... .. 6096/3/28
* cited by examiner
Sbj
u ect to an yd'l'
Isc aImer, t h e term 0 fh'
t is
patent is extended or adjusted under 35
Primary Examiner—Adolf Deneke Berhane
U.S.C. 154(b) by 0 days.
Hennessey, Grossman & Hage, PC.
(74) Attorney,
Agent,
(57)
(21) Appl. N0.: 09/814,090
(22)
*
FOREIGN PATENT DOCUMENTS
or
Firm—Hayes,
SoloWay,
ABSTRACT
When a ?rst switch is closed, a power-supply voltage V is
applied to a serial resonance circuit that is made up of a coil
Mal" 21’ 2001
Foreign Application Priority Data
and a capacitive load. When the voltage VC of the capacitive
load exceeds the power-supply voltage V, a diode conducts
Mar.
(51)
(52)
(58)
22,
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
a Current,
Int. c1.7 .............................................. .. G05F 1/613
us. Cl. ...................... .. 323/223 323/271 327/111
Field of Search
’
323/220 223
323/265
112, 345/211’
’
(56)
’
’
’
’
’
and thereby the Voltage VC
of the
Capacitive
load
is clamped at the power-supply voltage V, and resonance
St°PS~ AS a result, a ?ywheel Current ?ows through a Closed
loop that is made up of a coil, a ?rst diode, and a ?rst sWitch
in a closed state, in this order. When the ?rst sWitch is
212’
opened, the ?yWheel current has the loop shut off, and,
therefore, the voltage of the serial resonance circuit falls
rapidly in order to sustain or maintain the current, and falls
References Cited
beloW the earth potential so as to alloW a second diode to
US. PATENT DOCUMENTS
conduct the current. Thereby, the ?yWheel current ?oWs
4 767 959 A * 8/1988 Sakakibara et al
310/317
5,323,305 A * 6/1994 Ikeda et al. .... "1.2:..." 363/98
5:717:437 A * 2/1998 Sano et a1_
324/211
through the path that is made up of the second diode, the
C°?> and the ?rst diode’ and is regenerated to the POWer
source, and the current energy saved in the coil is returned
5,786,794
t0 the POWer source.
A
*
7/1998
Kishi et al.
5,936,598 A
*
8/1999
Hayama et al.
..........
5,994,929 A
* 11/1999 Sano et al. ............... .. 327/111
......
. . . .. 345/60
. . . .. 345/76
22 Claims, 26 Drawing Sheets
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Sheet 2 0f 26
US 6,366,063 B1
F I G. 2
(PRIOR ART)
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Sheet 3 0f 26
FIG. 4
(PRIOR ART)
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Apr. 2, 2002
US 6,366,063 B1
Sheet 4 0f 26
FIG. 5
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