Electricity: motive power systems – Switched reluctance motor commutation control
Reexamination Certificate
2000-10-04
2001-11-20
Ip, Paul (Department: 2837)
Electricity: motive power systems
Switched reluctance motor commutation control
C318S132000, C318S245000, C318S434000
Reexamination Certificate
active
06320337
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATION
The entire disclosure of a Japanese patent application No. Hei-11-285930 filed Oct.6, 1999 including its specification, claims, drawings, and summary are incorporated herein by reference in its entirety.
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a control drive circuit, in particular to a technique that produces a drive output of a voltage that is higher than a power source voltage for the drive.
2. Description of a Prior Art
There are known control drive circuits for use in the servo-control of motors, such as one disclosed in a Japanese patent KOKOKU publication No. Hei-8-23786.
FIG. 22
shows the constitution of such a control drive circuit.
The control drive circuit shown in
FIG. 22
comprises; a differential amplifier
4
, an output circuit
6
, and an output synthesizing circuit
8
. Signals from a Hall element
2
for detecting motor rotation, etc. are inputted to the differential amplifier
4
. Input signals (at the point (a) in
FIG. 22
) to the differential amplifier
4
are shown in FIG.
23
A.
Operation current that affects the amplification gain of the differential amplifier
4
is determined with a current I
0
. Therefore, the differential output from the differential amplifier
4
consists of the alternate current component from the Hall element
2
superimposed with the direct current component corresponding to I
0
/2.
The output circuit
6
is constituted to output a current that is equal to the differential output of the differential amplifier
4
minus the direct current component I
0
/2. The output signals (at points (b) and (c) in
FIG. 22
) of the output circuit
6
are shown in
FIGS. 23B and 23C
.
The output synthesizing circuit
8
synthesizes output signals of the output circuit
6
, and outputs resultant signals in an absolute value waveform. The output waveform (at the point (d) in
FIG. 22
) of the output synthesizing circuit
8
is shown in FIG.
23
D.
As described above, the use of the control drive circuit shown in
FIG. 22
makes it possible to eliminate the influence of the current that affects the amplification gain of the differential amplifier
4
and to obtain the absolute value waveform by extracting only the alternate current component coming from the Hall element
2
. Therefore, it is possible to easily obtain the absolute value waveform also with integrated circuits that are required to control the amplification gain with only direct current circuits. Another advantage is that, since no capacitors are used for removing direct current components, there is no restriction on the frequency of processing signals.
However, the conventional control drive circuit technique as described above has the following problem: Although the conventional technique as described above can provide a control drive circuit in a compact size for producing a stabilized voltage for driving a motor or the like to produce a stabilized torque, the circuit is incapable of producing a voltage that is higher than the power source voltage for driving the motor or the like.
SUMMARY OF THE INVENTION
The object of this invention is to provide a control drive circuit, etc. that can eliminate the problem related to the conventional control drive circuit and can provide a driving output of a voltage higher than that of a power source for driving.
A control drive circuit of this invention is one for obtaining a drive output on the basis of an inputted signal waveform and is characterized by comprising;
a reference current generating section for generating a reference current,
a control current generating section for generating
a control current, with its median being half the reference current, on the basis of the inputted signal waveform,
a signal dividing section for obtaining a partial control current by dividing the control current at a specified threshold value,
a partial drive output generating section for generating on the basis of the partial control current partial drive outputs not exceeding the drive power source voltage, and
a drive output synthesizing section for obtaining a drive output of a higher voltage than the drive power source voltage by synthesizing the generated partial drive outputs.
A control drive method of this invention is one for obtaining a drive output on the basis of an inputted signal waveform and is characterized by the steps of;
generating, on the basis of an inputted signal waveform, partial control signals divided at a specified threshold value, generating, on the basis of the generated partial control signals, partial drive outputs not exceeding a drive power source voltage, and obtaining a drive output of a higher voltage than the drive power source voltage by synthesizing the generated partial drive output.
While the invention may be broadly expressed as the above, its constitution, contents, objects and features will become more clear along with the following description in reference to the appended figures.
REFERENCES:
patent: 4403174 (1983-09-01), Miyazaki et al.
patent: 4463319 (1984-07-01), Kearney
patent: 5014020 (1991-05-01), Hayashi et al.
patent: 5084633 (1992-01-01), Izadinia
patent: 5331259 (1994-07-01), Naito
patent: 5378967 (1995-01-01), Naito
patent: 5382917 (1995-01-01), Miyake et al.
patent: 5559416 (1996-09-01), Hrassky
patent: 5574608 (1996-11-01), Fukuoka
patent: 5617503 (1997-04-01), Fronen et al.
patent: 5659230 (1997-08-01), Fukuoka
patent: 5796276 (1998-08-01), Phillips et al.
patent: 5818179 (1998-10-01), Kokami et al.
patent: 5859510 (1999-01-01), Dolan et al.
patent: 5877602 (1999-03-01), Kondoh et al.
Hogan & Hartson L.L.P.
Ip Paul
Rohm & Co., Ltd.
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