GB2301716A - Phase angle control circuit for a switching device - Google Patents
Phase angle control circuit for a switching device Download PDFInfo
- Publication number
- GB2301716A GB2301716A GB9511076A GB9511076A GB2301716A GB 2301716 A GB2301716 A GB 2301716A GB 9511076 A GB9511076 A GB 9511076A GB 9511076 A GB9511076 A GB 9511076A GB 2301716 A GB2301716 A GB 2301716A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- zero
- passing
- voltage
- power source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M5/275—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/293—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M5/275—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/293—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/2932—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage, current or power
- H02M5/2935—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage, current or power using reverse phase control, i.e. turn-on of switches in series with load at zero crossing of input voltage, turn-off before next zero crossing
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
A phase angle control circuit for a switching device 103 comprises a zero crossing detector 101 for detecting the zero crossing of an ac or pulsed dc waveform from a power source 100 connectable by the switching device 103 to a load 105, a timing circuit 102 responsive to the zero crossing detector and controlling the switching device 103, a feedback circuit 107 for detecting a physical or chemical status of the load and a central controller 110 for controlling the timing circuit according to the feedback from the feedback circuit 103. The timing circuit 102 is coupled to the switching device 103 by a driving circuit 104. A compensation component 106, such as a flywheel diode, capacitor or current limiting resistor is coupled across the load. The switching device may be a solid state switch such as an IGBT or an electromechanical switch. The physical status detected by the feedback circuit 107 may be velocity, direction, torque, temperature or sound intensity. The load may be a rotational machine, lighting device or a resistive, inductive or capacitive load.
Description
PHASE SHIFT CUT-OFF CONTROL CIRCUIT
SUMMARY OF THE INVENTION
The phase shift cut-off control circuit is an innovative circuit to provide effective phase angle conduction, whereby to further control the output voltage of the AC or intermittent pulse DC power source, thereof it is characterized in that the AC voltage at the first zeropassing value (or at the neighborhood) is the trigger point, and the second zero-passing value is the cut-off point, i. e. phase shift control is performed between the electrical angle 00-1800 to modulate the output voltage.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is the schematic block diagram of the invention illustrating the main circuit composition.
Figure 1-1 is a schematic diagram illustrating a bridge switching circuit constituted by multiple active switching devices.
Figure 1-2 is a schematic diagram of the invention illustrating the combination with a bridge rectifier to constitute a AC bi-directional active switching device.
Figure 2 is a circuit example of the invention.
DETAILED DESCRIPTION OF THE INVENTION
The phase shift cut-off control circuit is an innovative circuit to provide effective phase angle conduction, whereby to further control the output voltage of the AC or intermittent pulse DC power source, thereof it is characterized in that the AC voltage at the first zeropassing value (or at the neighborhood) is the trigger point, and the second zero-passing value is the cut-off point, i. e. phase shift control is performed between the electrical angle 00-1800 to modulate the output voltage.
The power source voltage in the conventional phase control circuit is usually triggered between after the zero pulse value and before the next zero-passing value, and through the cut-off at the zero-passing value to control the voltage within the 00-1800 electrical angle in the conduction angle range, thereof its disadvantage is that the trigger action may evoke an instant rising surge current (especially at 90 angle) to generate electromagnetic noise and impact on the load.
Please refer to Enclosure 1 for the comparison of output wave shapes between the phase shift cut-off control circuit and the conventional phase shift conduction.
Figure 1 is the schematic block diagram of the phase shift cut-off control circuit illustrating the main circuit composition, which is mainly comprised of the following:
A power source 100: It is a AC sinusoidal wave shape
power source or a DC power source with zero-passing
pulse wave shape or other zero-passing wave shape
power source, or a DC power source with zero-passing
intermittent pulse wave shape;
A voltage zero-passing detector circuit 101: It is a
circuit for detecting the voltage zero-passing,
whereof it is constituted by solid state or
electromechanical components, whereby to generate
corresponding power signal when the power source
voltage passing the zero value;
Conduction timing control circuit 102:It is activated
by the zero-passing detecting signal from the voltage
zero-passing detector circuit to generate a conduction
timing controllable driving signal which is
automatically cut-off at the time when the
corresponding phase angle is reached.
An active switching device 103: It is constituted by
solid state or electromechanical switching components
and its corresponding pre-driving circuit 104 to be
directly driven by the conduction timing control
circuit 102 to further control the loading power
supply status of the power source to be triggered
conduction by the zero-passing voltage, and is cut off
before or at the second zero-passing voltage; thereof
the active switching device 103 can be further
provided with a bridge switching circuit constituted
by multiple active switching devices to control the
voltage polarities, or the said device can be combined
with a bridge rectifier to constitute a AC bi
directional active switching device to control the
voltage.
A load 105: It is a rotational electrical machine or
lighting device, or other resistive, inductive, or
capacitive loads, or the mixture of the two or more
than two of the above said loads; A compensation component 106: It is applicable for
compensation in the case of load driven by DC pulse
power source, whereof it includes adopting a reverse
parallel combined flywheel diode as an inductive load
compensation component, a parallel combined capacitor
as a resistive load compensation component, whereas
the series combined current-limited resistor may be
used as a compensation component according to
requirements for capacitive loads; therein the
compensation components can be selectively installed
according to requirements;
A feedback circuit 107:It is a sensing component for
detecting the physical status (including translation,
velocity, direction, torque, temperature, brightness,
sound intensity, etc.) or the chemical status of the
load, whereby to feedback the power signal to control
the conduction timing of the afore said conduction
timing control circuit 102, thereof the feedback
circuit can be selectively installed according to
requirements;
A signal source supply device 108: It is for supplying
power required by the circuit components in the afore
said various signal control circuits.
A signal input interface 109: It is constituted by
electromechanical or solid state components, wherein
it accepts the manual signal or power signal and
provides input to the central controller to control
the output status from the active switching device to
the load, thereof the signal input interface can be
selectively installed according to requirements.
A central controller 110: It is for controlling the
phase shift cut-off control circuit to be driven in
variable conduction angle or to be activated smoothly,
or to accept the inputs from the feedback circuit and
the control signal input interface for logic or
program treating functions to control the conduction
timing control circuit 102 and the active switching
device; thereof it is constituted by a microprocessor
and relevant softwares or other solid state or
electromechanical circuit components, thereof the
central controller can be selectively installed
according to requirements.
Figure 2 is a circuit example of the phase shift cut-off control circuit, which is mainly comprised of the following:
A power source 100: It is a AC sinusoidal wave shape
power source or a DC power source with zero-passing
pulse wave shape or other zero-passing wave shape
power source, or a DC power source with zero-passing
intermittent pulse wave shape; A voltage zero-passing detector circuit 101: It is
constituted by operational amplifier and sampling
circuit components, wherein it is by detecting the
power source zero-passing point and the circuit for
detecting the voltage zero-passing, whereof it is
constituted by solid state or electromechanical
components, whereby to generate corresponding power
signal when the power source voltage passing the zero
value;
Conduction timing control circuit 102: It is
constituted by a single steady state circuit, whereof
it has a setting timing delay circuit to cut-off after
activation by the zero-passing detecting signal from
the voltage zero-passing detector circuit 101, whereby
to generate a conduction timing controllable driving
signal which is automatically cut-off when time is
reached, thereof this circuit can be constituted by
other timing circuits such as B555 series or by a
microprocessor and relevant softwares; An active switching device 103:It is constituted by
IGBT or other solid state switching transistors and
pre-driving circuit 104 to be directly driven by the
conduction timing control circuit 102 to further
control the loading power supply status of the power
source to be triggered conduction by the zero-passing
voltage, and is cut off before or at the second zero
passing voltage; thereof the active switching device
103 can be further provided with a bridge switching
circuit constituted by multiple active switching
devices to control the voltage polarities, or the said
device can be combined with a bridge rectifier to
constitute a AC bi-directional active switching device
to control the voltage.
A signal source supply device 108: It is for supplying
power required by the circuit components in the afore
said various signal control circuits.
A signal input interface 109: It is constituted by
adjustable resistors to control conduction time of the
conduction timing control circuit 102, and to further
control the working phase angle range for accepting
the manual or power signal and providing inputs to the
central controller to control the output status from
the active switching device to the load.
Based on the above said principles, the phase shift cutoff control circuit can be further provided in multiple units and combining with multiple active switching device to constitute a multi-phase bridge circuit for applications in the phase shift cut-off control of the multi-phase AC power source to the load.
The voltage wave shape of the circuit can be improved according to the loading conditions through the following auxiliary components, whereof the compensation circuits includes the following:
A resistive load parallel combined with an auxiliary
capacitor, whereby the conducting current is always
started to charge from zero, and the loading current
to the resistor is smoothly increased, and at the time
of cut-off, the compensation discharge current is
provided to suppress the power noise from the sudden
voltage drop;;
An inductive DC motor load which smooth the voltage
passing the front section of the sinusoidal wave of
the power source when conducting and the motor
armature EMF is extended backward to lower the voltage,
thereby the electromagnetic noise is lower and the
torque pulsation is smaller, and the circuit stability
can be raised by parallel combining flywheel diodes at
the two ends of the armature to absorb EMF as shown in
Enclosure 2:
A capacitive load to let the voltage always smoothly
rise from the front section of the sinusoidal wave at
conduction while the capacitor charging current
smoothes input and at cut-off the capacitor discharge
power to avoid the sudden voltage drop.
As is summarized from the above descriptions, the phase shift cut-off control circuit innovatively discloses an original technical idea of adopting zero-passing conduction and controlling the cut-off phase angle on the
AC phase control circuits. As the industrial power equipments are getting more and more, the suppression of noise signal is becoming an important tendency, so the practical usefulness of the claim is obvious, and the applicant has survey the prior arts and found no similar disclosures, therefore, your legal approval on the claim is greatly appreciated.
Claims (4)
1. A phase shift cut-off control circuit which is an
innovative circuit to provide effective phase angle
conduction, whereby to further control the output
voltage of the AC or intermittent pulse DC power
source, thereof it is characterized in that the AC
voltage at the first zero-passing value (or at the
neighborhood) is the trigger point, and the second
zero-passing value is the cut-off point, i. e. phase
shift control is performed between the electrical
angle 0 ~180 to modulate the output voltage, wherein
it is mainly comprised of the following:
A power source 100: It is a AC sinusoidal wave shape
power source or a DC power source with zero-passing
pulse wave shape or other zero-passing wave shape
power source, or a DC power source with zero-passing
intermittent pulse wave shape;
A voltage zero-passing detector circuit 101:It is a
circuit for detecting the voltage zero-passing,
whereof it is constituted by solid state or
electromechanical components, whereby to generate
corresponding power signal when the power source
voltage passing the zero value;
Conduction timing control circuit 102: It is
activated by the zero-passing detecting signal from
the voltage zero-passing detector circuit to
generate a conduction timing controllable driving
signal which is automatically cut-off at the time
when the corresponding phase angle is reached.
An active switching device 103: It is constituted by
solid state or electromechanical switching
components and its corresponding pre-driving circuit
104 to be directly driven by the conduction timing
control circuit 102 to further control the loading
power supply status of the power source to be
triggered conduction by the zero-passing voltage,
and is cut off before or at the second zero-passing
voltage; thereof the active switching device 103 can
be further provided with a bridge switching circuit
constituted by multiple active switching devices to
control the voltage polarities, or the said device
can be combined with a bridge rectifier to
constitute a AC bi-directional active switching
device to control the voltage.
A load 105: It is a rotational electrical machine or
lighting device, or other resistive, inductive, or
capacitive loads, or the mixture of the two or more
than two of the above said loads;
A compensation component 106: It is applicable for
compensation in the case of load driven by DC pulse
power source, whereof it includes adopting a reverse
parallel combined flywheel diode as an inductive
load compensation component, a parallel combined
capacitor as a resistive load compensation component,
whereas the series combined current-limited resistor
may be used as a compensation component according to
requirements for capacitive loads; therein the
compensation components can be selectively installed
according to requirements; A feedback circuit 107:It is a sensing component
for detecting the physical status (including
translation, velocity, direction, torque,
temperature, brightness, sound intensity, etc.) or
the chemical status of the load, whereby to feedback
the power signal to control the conduction timing of
the afore said conduction timing control circuit 102,
thereof the feedback circuit can be selectively
installed according to requirements;
A signal source supply device 108: It is for
supplying power required by the circuit components
in the afore said various signal control circuits.
A signal input interface 109: It is constituted by
electromechanical or solid state components, wherein
it accepts the manual signal or power signal and
provides input to the central controller to control
the output status from the active switching device
to the load, thereof the signal input interface can
be selectively installed according to requirements.
A central controller 110: It is for controlling the
phase shift cut-off control circuit to be driven in
variable conduction angle or to be activated
smoothly, or to accept the inputs from the feedback
circuit and the control signal input interface for
logic or program treating functions to control the
conduction timing control circuit 102 and the active
switching device; thereof it is constituted by a
microprocessor and relevant softwares or other solid
state or electromechanical circuit components,
thereof the central controller can be selectively
installed according to requirements.
2. The phase shift cut-off control circuit as in claim 1,
wherein it is comprised of the following:
A power source 100: It is a AC sinusoidal wave shape
power source or a DC power source with zero-passing
pulse wave shape or other zero-passing wave shape
power source, or a DC power source with zero-passing
intermittent pulse wave shape;
A voltage zero-passing detector circuit 101: It is
constituted by operational amplifier and sampling
circuit components, wherein it is by detecting the
power source zero-passing point and the circuit for
detecting the voltage zero-passing, whereof it is
constituted by solid state or electromechanical
components, whereby to generate corresponding power
signal when the power source voltage passing the
zero value;
Conduction timing control circuit 102:It is
constituted by a single steady state circuit,
whereof it has a setting timing delay circuit to
cut-off after activation by the zero-passing
detecting signal from the voltage zero-passing
detector circuit 101, whereby to generate a
conduction timing controllable driving signal which
is automatically cut-off when time is reached,
thereof this circuit can be constituted by other
timing circuits such as B555 series or by a
microprocessor and relevant softwares;
An active switching device 103:It is constituted by
IGBT or other solid state switching transistors and
pre-driving circuit 104 to be directly driven by the
conduction timing control circuit 102 to further
control the loading power supply status of the power
source to be triggered conduction by the zero
passing voltage, and is cut off before or at the
second zero-passing voltage; thereof the active
switching device 103 can be further provided with a
bridge switching circuit constituted by multiple
active switching devices to control the voltage
polarities, or the said device can be combined with
a bridge rectifier to constitute a AC bi-directional
active switching device to control the voltage.
A signal source supply device 108: It is for
supplying power required by the circuit components
in the afore said various signal control circuits.
A signal input interface 109: It is constituted by
adjustable resistors to control conduction time of
the conduction timing control circuit 102, and to
further control the working phase angle range for
accepting the manual or power signal and providing
inputs to the central controller to control the
output status from the active switching device to
the load.
3. The phase shift cut-off control circuit as in claim 1,
wherein it can be further provided in multiple units
and combining with multiple active switching device to
constitute a multi-phase bridge circuit for
applications in the phase shift cut-off control of the
multi-phase AC power source to the load.
4. The phase shift cut-off control circuit as in claim 1,
whereof the voltage wave shape of the circuit can be improvea according to the loading conditions through the following auxiliary components, whereof the compensation circuits includes the following: A resistive load parallel combined with an auxiliary
capacitor, whereby the conducting current is always
started to charge from zero, and the loading current
to the resistor is smoothly increased, and at the
time of cut-off, the compensation discharge current
is provided to suppress the power noise from the
sudden voltage drop; ; An inductive DC motor load which smooth the voltage
passing the front section of the sinusoidal wave of
the power source when conducting and the motor
armature EMF is extended backward to lower the
voltage, thereby the electromagnetic noise is lower
and the torque pulsation is smaller, and the circuit
stability can be raised by parallel combining
flywheel diodes at the two ends of the armature to
absorb EMF.
A capacitive load to let the voltage always smoothly
rise from the front section of the sinusoidal wave
at conduction while the capacitor charging current
smoothes input and at cut-off the capacitor
discharge power to avoid the sudden voltage drop.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9511076A GB2301716A (en) | 1995-06-01 | 1995-06-01 | Phase angle control circuit for a switching device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9511076A GB2301716A (en) | 1995-06-01 | 1995-06-01 | Phase angle control circuit for a switching device |
Publications (2)
Publication Number | Publication Date |
---|---|
GB9511076D0 GB9511076D0 (en) | 1995-07-26 |
GB2301716A true GB2301716A (en) | 1996-12-11 |
Family
ID=10775340
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9511076A Withdrawn GB2301716A (en) | 1995-06-01 | 1995-06-01 | Phase angle control circuit for a switching device |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2301716A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2770943A1 (en) * | 1997-11-13 | 1999-05-14 | Francois Kneider | Controlling electricity supply to load |
GB2332108A (en) * | 1997-12-05 | 1999-06-09 | Samsung Kwang-Ju Electronics Co Ltd | Motor phase control apparatus |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1389261A (en) * | 1972-03-21 | 1975-04-03 | Litton Industrial Products | Method and means for controlling the output conditions of a self-excited alternating current motor |
GB1463010A (en) * | 1974-06-21 | 1977-02-02 | Cohen A A | Digital speed control system for an electric motor |
GB2011195A (en) * | 1977-10-11 | 1979-07-04 | Midland Binding Machines Ltd | Controlling the supply of a.c. to a load |
EP0247650A2 (en) * | 1986-04-30 | 1987-12-02 | Philips Electronics Uk Limited | Motor speed control system |
GB2212013A (en) * | 1985-05-03 | 1989-07-12 | Hoover Plc | Electric motor controller |
US4996469A (en) * | 1990-03-16 | 1991-02-26 | Allen-Bradley Company, Inc. | Electric motor controller with bypass contactor |
US5008608A (en) * | 1989-12-26 | 1991-04-16 | Allen-Bradley Company, Inc. | Controller for starting and stopping electric motors |
-
1995
- 1995-06-01 GB GB9511076A patent/GB2301716A/en not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1389261A (en) * | 1972-03-21 | 1975-04-03 | Litton Industrial Products | Method and means for controlling the output conditions of a self-excited alternating current motor |
GB1463010A (en) * | 1974-06-21 | 1977-02-02 | Cohen A A | Digital speed control system for an electric motor |
GB2011195A (en) * | 1977-10-11 | 1979-07-04 | Midland Binding Machines Ltd | Controlling the supply of a.c. to a load |
GB2212013A (en) * | 1985-05-03 | 1989-07-12 | Hoover Plc | Electric motor controller |
EP0247650A2 (en) * | 1986-04-30 | 1987-12-02 | Philips Electronics Uk Limited | Motor speed control system |
US5008608A (en) * | 1989-12-26 | 1991-04-16 | Allen-Bradley Company, Inc. | Controller for starting and stopping electric motors |
US4996469A (en) * | 1990-03-16 | 1991-02-26 | Allen-Bradley Company, Inc. | Electric motor controller with bypass contactor |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2770943A1 (en) * | 1997-11-13 | 1999-05-14 | Francois Kneider | Controlling electricity supply to load |
GB2332108A (en) * | 1997-12-05 | 1999-06-09 | Samsung Kwang-Ju Electronics Co Ltd | Motor phase control apparatus |
GB2332108B (en) * | 1997-12-05 | 2000-02-02 | Kwangju Electronics Co Limited | Motor phase control apparatus |
Also Published As
Publication number | Publication date |
---|---|
GB9511076D0 (en) | 1995-07-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CA2628529C (en) | Method and apparatus for quiet fan speed control | |
US7692474B2 (en) | Control circuit for a high-side semiconductor switch for switching a supply voltage | |
US5789894A (en) | Solid state motor speed control | |
ATE476784T1 (en) | MOTOR WITH PHASE ANGLE ADVANCE | |
WO2003032460A1 (en) | Motor control circuit overcurrent protection | |
JP2017079534A (en) | Gate control circuit | |
JPH0772851B2 (en) | Phase control circuit multiplexer | |
GB2301716A (en) | Phase angle control circuit for a switching device | |
KR100696978B1 (en) | Device for controlling power by phase control, and reducing harmonic waves | |
JP2000517148A (en) | Short circuit protection for semiconductor switches | |
JP4679639B2 (en) | Phase gate control apparatus and method | |
KR19980086732A (en) | Method and device for controlling the output of electrical consumption connected to ac line voltage | |
KR20080018540A (en) | Apparatus for controlling inrush current of vehicle electronic parts | |
KR200436096Y1 (en) | touch switching circuit | |
CN117748430A (en) | Leakage current control device, control equipment and electric appliance | |
JPH0524415Y2 (en) | ||
JP3559051B2 (en) | Relay drive circuit | |
KR960001955B1 (en) | Phase controlling apparatus | |
NL2000918C2 (en) | Electric power tool e.g. screw machine, has control circuit fitted to switch to gradually increase supply of electric power, by increasing ratio between duty cycle and off duration of switch | |
RU2095932C1 (en) | Device for stabilization of electric motor rotation speed | |
KR900001386Y1 (en) | Controll apparatus | |
KR930004805Y1 (en) | Inverter circuit | |
KR940008219A (en) | Power factor controller of analog induction motor | |
KR960009035Y1 (en) | Base driving control circuit of motor | |
KR20010003686A (en) | apparatus for operating cooling fans of Plasma Display Panel |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |