摘要:
A fast current generating element in a current generating unit, used by the present invention, provides a large current for accelerating the switching of transistor switches when the transistor switches are switched. The fast current generating element includes a capacitor to provide a large differential current when a voltage level transiently changes during the switching of the transistor switches. Therefore, a transient response time of a signal transformer is shortened.
摘要:
A bias voltage is compared with a voltage difference in a detecting element according to the present invention. A bias voltage unit is coupled to the detecting element, so that they have a common voltage level to avoid noises when the circuit is operating. Accordingly, the erroneous detection caused by the noise interference can be avoided. Hence, a detecting element with a low resistance, such as an MOEFET, can be used in the present invention to decrease power consumption arisen from current detection and to further increase conversion efficiency.
摘要:
A fast current generating element in a current generating unit, used by the present invention, provides a large current for accelerating the switching of transistor switches when the transistor switches are switched. The fast current generating element includes a capacitor to provide a large differential current when a voltage level transiently changes during the switching of the transistor switches. Therefore, a transient response time of a signal transformer is shortened.
摘要:
A voltage detection enabling circuit is disclosed. The voltage detection enabling circuit includes a reference voltage generating unit, an enabling protection unit, and an enabling judgment unit. The reference voltage generating unit is coupled to a driving voltage, and generates a reference voltage signal. The enabling protection unit receives the reference voltage signal and outputs an enabling judgment signal when the reference voltage signal is higher than a voltage parameter. Particularly, the voltage parameter is a component parameter of an electronic component. Then the enabling judgment unit determines whether an enabling signal is generated or not according to the enabling judgment signal and the driving voltage.
摘要:
In the conventional temperature compensation circuit, the thermal resistor is used to perform the temperature compensation, but the provided compensation range is limited due to the temperature coefficient of the thermal resistor. The embodiment of the invention provides a temperature coefficient modulating circuit capable of amplifying the temperature coefficient of the thermal resistor, so as to provide a wider compensation range in different applications.
摘要:
A bias voltage is compared with a voltage difference in a detecting element according to the present invention. A bias voltage unit is coupled to the detecting element, so that they have a common voltage level to avoid noises when the circuit is operating. Accordingly, the erroneous detection caused by the noise interference can be avoided. Hence, a detecting element with a low resistance, such as an MOEFET, can be used in the present invention to decrease power consumption arisen from current detection and to further increase conversion efficiency.
摘要:
The present invention employs a pin of a controller to set an over current protection value and a time period respectively by means of time-division and/or voltage and current. Therefore, the cost of the controller is reduced due to reducing the amount of pins thereof. Furthermore, the time period is not only used to setting a constant on time, but also used to setting a constant off time and an operating frequency for different controlling mode.
摘要:
The present invention employs a pin of a controller to set an over current protection value and a time period respectively by means of time-division and/or voltage and current. Therefore, the cost of the controller is reduced due to reducing the amount of pins thereof. Furthermore, the time period is not only used to setting a constant on time, but also used to setting a constant off time and an operating frequency for different controlling mode.
摘要:
The present invention discloses a virtual keyboard, which includes a virtual region, at least two vibration sensors, a storage unit and a processing unit. The virtual region is formed on a surface and has a plurality of virtual keys. The vibration sensors are provided on the surface. The storage unit is used to store a plurality of data, each of the plurality of data recording an actual location and signification of each of the virtual keys. The processing unit is electronically connected to the vibration sensors and the storage unit. When a vibration signal is caused by touching the virtual region, each of the vibration sensors receives the vibration signal and respectively sends an output signal corresponding to the vibration signal to the processing unit. The processing unit determines a vibration source location of the vibration signal based on the output signals and locates a knocked virtual key by comparison of the vibration source location and the actual location recorded in the data, and generates a key signal according to the signification of the knocked key of the virtual keys.
摘要:
A data structure for a point of interest (POI) and a method for use and application of POI information with the data structure, and is applied in a handheld device. The POI information for a single POI is sorted based on attributes of the POI and the sorted sets of POI information are included in folders, file names or POI information. As such, when a locating operation for the POI information is requested, the amount of operations for locating the handheld device may be reduced and processing thereof may be sped up. Further, the sorting technology with respect to the POI information corresponding to the POI may be performed based on an attribute district of the POI. A plurality of sets of POI information thus obtained may be compressed to a single set of POI information so that the total information stored in the handheld device may be reduced.