Abstract:
A magnetic fixing device for fixing a magnetic coil to a rotor of an autowinder includes a first clip element and a second element. The first clip element is disposed on the rotor of the autowinder, and the second clip element corresponds to the first clip element for cooperatively clipping the magnetic coil by magnetic force.
Abstract:
An exemplary orthopedic adjustment device includes an orthopedic appliance, an adjustment unit module and a pressure control module. The appliance is configured for supporting a human spine. The adjustment unit module includes adjustment units. Each of the adjustment units includes a chamber, a pressure sensor and a pump. The pressure sensor and the pump are arranged in the chamber. Each of the pressure sensors is configured for detecting a pressure of each chamber corresponding thereto. Each of the pumps is configured for adjusting the pressure of each chamber corresponding thereto. The pressure control module is configured for receiving pressure signals from the pressure sensors of the chambers and providing pressure adjusting signals to the pumps to adjust the pressures of the chambers.
Abstract:
A voice coil motor includes a movable member, a base, and a first elastic member. The movable member comprises a barrel, and a plurality of fixing posts protrudes from the bottom of the barrel. The base defines a through hole, a plurality of recessed portions, and a plurality of concavities. The axis of through hole is coaxial with the barrel. The recessed portions surround the aperture. Each of the recessed portions is arranged between two concavities. The depth of the recessed portion is less than the height of the fixing post, and the depth of the concavity is larger than that of the recessed portion. The elastic member comprises an elastic portion, which defines a first fixing hole. The fixing post extends through the first fixing hole and is received in the recessed portion.
Abstract:
Power supplies and related methods capable of reducing output voltage ripple. A power supply provides an output voltage to a load and controls the output voltage to approach a target voltage. The output voltage is compared with the target voltage to generate a control signal, which controls an output current of the power supply. When the control signal causes an increase in the output current, the target voltage is reduced.
Abstract:
A pulse width modulation (PWM) control circuit is applied to a power converter with a charging capacitor. The PWM control circuit includes a PWM signal generator, a first comparator, and a reference voltage modulator. A PWM signal generator generates a PWM signal to control a power switch in the power converter. Two input terminals of the first comparator respectively receive a first reference voltage and a sensing voltage, which is proportional to a primary-side current of a transformer. When the power switch is turned on and the sensing voltage rises to the level of the first reference voltage, the first comparator outputs a first control signal to the PWM signal generator. Then, the PWM signal generator outputs a signal to turn off the power switch. The reference voltage modulator outputs the first reference voltage according to a feedback voltage relative to the output voltage of the power converter.
Abstract:
A control circuit for adjusting leading edge blanking time is disclosed. The control circuit is applied to a power converting system. The control circuit adjusts a leading edge blanking time according to a feedback signal relative to a load connected to the output terminal of the power converting system. An over-current protection mechanism of the power converting system is disabled within the leading edge blanking time.
Abstract:
A voice coil motor for driving a lens group includes a housing, a first cover, a second cover, a movable member, and a plurality of magnets. The housing is a hollow and includes a top plate and four sidewalls protruding from the top plate. The movable member is movably received in a space defined by the housing and the first and second covers, and includes a barrel for receiving and being connected to the lens group, and a coil arranged around the barrel. The magnets are arranged between the housing and the movable member, stayed in contact with the sidewalls, and drive the movable member and the lens group to move in the housing when a current is supplied to the coil.
Abstract:
An imaging device includes an auto-focusing actuator, an image sensor, and a transparent dust-proofing member. The auto-focusing actuator includes a housing. The housing includes a top surface and an opposite bottom surface, and defines a through hole extending from the top surface to the bottom surface. A number of positioning rods extend from the top surface and cooperatively define a fixing space. The image sensor is mounted on the bottom surface of the housing and aligned with the through hole. The transparent dust-proofing member is mounted in the fixing space and seals the through hole.
Abstract:
A coil rack fixing device for fixing a coil rack to a rotor of a winding machine, includes a first member and a second member. The first member is configured for mounting on the rotor. The first member includes a support shaft coaxial to the rotor. The support shaft has a magnetic attracting portion positioned on a free end thereof. The second member includes a body and a magnet. The body defines a through hole thereof. The through hole receives the support shaft. The magnet is received in the through hole and capable of moving along the through hole relative to the magnetic attracting portion.
Abstract:
A control circuit for adjusting leading edge blanking time is disclosed. The control circuit is applied to a power converting system. The control circuit adjusts a leading edge blanking time according to a feedback signal relative to a load connected to the output terminal of the power converting system. An over-current protection mechanism of the power converting system is disabled within the leading edge blanking time.