Abstract: A doorbell device is provided. The doorbell device includes a user interface, a control circuit, a power switching circuit, a first capacitor, a second capacitor, and a charge/discharge control circuit. The user interface includes a button. The control circuit is coupled to the user interface and generates a power control signal according to a state of the button. The power switching circuit is coupled to the control circuit and outputs a first voltage signal at a first node to supply power to the control circuit according to the power control signal. The first capacitor is coupled to the first node. The charge/discharge control circuit is coupled between the first node and the second capacitor and controls whether the second capacitor is charged or discharged according to the first voltage signal.

Abstract: A heating device is provided. A temperature sensing unit is configured to sense an ambient temperature and accordingly output a temperature sensing voltage. A driving unit is coupled to a heating transistor unit and the temperature sensing unit, and configured to drive the heating transistor unit for performing heating based on the temperature sensing voltage. An activating unit is coupled to the temperature sensing unit, configured to output an activating signal based on the temperature sensing voltage when a temperature of the printed circuit board has risen up to a preset temperature. The heating device as provided can assure that the activating signal can be normally outputted by the heating device under an ambient at an extremely low temperature.

Abstract: A wireless communication device for transceiving heterogeneous radio-frequency (RF) signals is provided. The wireless communication device includes a first antenna, a second antenna, a first transceiver, a second transceiver and a controller. The first transceiver controls the first antenna through a first transceiving path to transceive a first RF signal according to a first wireless communication standard. The second transceiver controls the second antenna through a second transceiving path to transceive a second RF signal according to a second wireless communication standard. In a joining process when the wireless communication device establishes connection to an end device according to the second wireless communication standard, the controller reduces transmission power for transmitting the first RF signal, or reduces sensitivity for receiving the second RF signal.

Abstract: An IP camera is provided. The IP camera includes a camera lens, an imaging unit, an IR cut filter, a motor, and a control circuit. The motor controls the position of the IR cut filter. The control circuit outputs a first pulse signal to drive the motor to move the IR cut filter such that light that passes through the camera lens reaches the imaging unit without passing through the IR cut filter. The control circuit controls the motor and prevents the motor from heat-related damage.

Abstract: A power sourcing equipment is provided. The power sourcing equipment is connected to an Ethernet cable. The power sourcing equipment includes a switching circuit, a power circuit, and a detection circuit. The power circuit is coupled to a power supply output terminal via the switching circuit. The detection circuit is configured to control a state of the switching circuit according to a first resistance between a first pin and a second pin of the Ethernet cable.

Abstract: A wireless communication device for transceiving heterogeneous radio-frequency (RF) signals is provided. The wireless communication device includes a first antenna, a second antenna, a first transceiver, a second transceiver and a controller. The first transceiver controls the first antenna through a first transceiving path to transceive a first RF signal according to a first wireless communication standard. The second transceiver controls the second antenna through a second transceiving path to transceive a second RF signal according to a second wireless communication standard. In a joining process when the wireless communication device establishes connection to an end device according to the second wireless communication standard, the controller reduces transmission power for transmitting the first RF signal, or reduces sensitivity for receiving the second RF signal.

Abstract: A security device comprises a mounting plate and a mounting device. The mounting plate, for being fixed to a surface, comprises a first electrical contact point and a second electrical contact point electrically connecting to the first electrical contact point. The mounting device is to be assembled to the mounting plate and comprises a third electrical contact point, a fourth electrical contact point and a detection circuit. The third electrical contact point is for contacting the first electrical contact point when the mounting device is assembled to the mounting plate. The fourth electrical contact point is for contacting the second electrical contact point when the mounting device is assembled to the mounting plate. The detection circuit is electrically connected to the fourth electrical contact point, for determining whether the fourth electrical contact point is electrically connected to the third electrical contact point.

Abstract: Disclosed herein is a microstrip line filter including a dielectric substrate, a first hairpin resonator, and a metal ground layer. The first hairpin resonator is disposed on a first layer of the dielectric substrate. The metal ground layer is disposed on a second layer of the dielectric substrate. The metal ground layer includes a first defected ground structure. The first defected ground structure includes a first defected area, a second defected area, and a third defected area. The projection of the first defected area on the first layer is located inside the hairpin structure of the first hairpin resonator. The projection of the second defected area on the first layer is located in a direction opposite to an opening direction of the first hairpin resonator. The third defected area connects the first defected area and the second defected area.

Abstract: A doorbell device is provided. The doorbell device includes a user interface, a control circuit, a power switching circuit, a first capacitor, a second capacitor, and a charge/discharge control circuit. The user interface includes a button. The control circuit is coupled to the user interface and generates a power control signal according to a state of the button. The power switching circuit is coupled to the control circuit and outputs a first voltage signal at a first node to supply power to the control circuit according to the power control signal. The first capacitor is coupled to the first node. The charge/discharge control circuit is coupled between the first node and the second capacitor and controls whether the second capacitor is charged or discharged according to the first voltage signal.

Abstract: An IP camera is provided. The IP camera includes a camera lens, an imaging unit, an IR cut filter, a motor, and a control circuit. The motor controls the position of the IR cut filter. The control circuit outputs a first pulse signal to drive the motor to move the IR cut filter such that light that passes through the camera lens reaches the imaging unit without passing through the IR cut filter. The control circuit controls the motor and prevents the motor from heat-related damage.

Abstract: A security device comprises a mounting plate and a mounting device. The mounting plate, for being fixed to a surface, comprises a first electrical contact point and a second electrical contact point electrically connecting to the first electrical contact point. The mounting device is to be assembled to the mounting plate and comprises a third electrical contact point, a fourth electrical contact point and a detection circuit. The third electrical contact point is for contacting the first electrical contact point when the mounting device is assembled to the mounting plate. The fourth electrical contact point is for contacting the second electrical contact point when the mounting device is assembled to the mounting plate. The detection circuit is electrically connected to the fourth electrical contact point, for determining whether the fourth electrical contact point is electrically connected to the third electrical contact point.

Abstract: A light determination circuit having a laser module and a detection circuit is provided. The detection circuit comprises a threshold voltage determination unit, a comparison unit and a switch unit. The threshold voltage determination unit determines a threshold voltage corresponding to the laser module. The comparison unit is for comparing a voltage level at a first node of the laser module with the threshold voltage to output a switch signal. The switch unit is controlled by the switch signal to switch the voltage level at an output end of the detection circuit. When the laser module is conducted, the voltage level at the first node is lower than the threshold voltage, the switch signal controls the switch unit, such that the output end outputs a high level voltage and vice versa.

Abstract: A light determination circuit having a laser module and a detection circuit is provided. The detection circuit comprises a threshold voltage determination unit, a comparison unit and a switch unit. The threshold voltage determination unit determines a threshold voltage corresponding to the laser module. The comparison unit is for comparing a voltage level at a first node of the laser module with the threshold voltage to output a switch signal. The switch unit is controlled by the switch signal to switch the voltage level at an output end of the detection circuit. When the laser module is conducted, the voltage level at the first node is lower than the threshold voltage, the switch signal controls the switch unit, such that the output end outputs a high level voltage and vice versa.

Abstract: A thermal cutoff circuit for an electronic device including a power unit, a thermal sensor, a logic unit, and a power switch unit is provided. The power unit includes a power switch for powering up the thermal cutoff circuit with a supply voltage in response to a user event. The thermal sensor provides an active thermal sense signal and an inactive thermal sense signal when a temperature of the electronic device exceeds a threshold and does not exceed the threshold, respectively. The logic unit provides an inactive cutoff signal and provides an active cutoff signal respectively according to the inactive thermal sense signal and the active thermal sense signal. The power switch unit powers the electronic device up according to the inactive cutoff signal and stops powering up the electronic device according to the active thermal sense signal.

Abstract: An inverse F antenna (IFA) antenna is provided. The IFA antenna includes a ground portion, a radiation portion, a short-circuit portion and a feed-in portion. The width of the radiation portion is larger than the width of the ground portion, such that the operating band of the IFA antenna covers at least a first band and a second band at the same time. The short-circuit portion is disposed on the ground portion and is connected to the radiation portion. The feed-in portion is connected to the radiation portion.

Abstract: A patched inverse F antenna (PIFA) antenna is provided. The PIFA antenna includes a ground portion, a radiation portion, a short-circuit portion and a feed-in portion. The width of the radiation portion is larger than the width of the ground portion, such that the operating band of the PIFA antenna covers at least a first band and a second band at the same time. The short-circuit portion is disposed on the ground portion and is connected to the radiation portion. The feed-in portion is connected to the radiation portion.

Abstract: An antenna structure and its manufacture method are disclosed. The antenna structure is applied to an electronic device and wirelessly operated at least a frequency band. The antenna structure includes a first antenna body, a second antenna body connected to the first antenna body through a third body. The first antenna body is provided for generating radiations. The second antenna body is connected to the first antenna body through the third body. The second antenna body has a folding portion upwardly extended from a tail portion of the second antenna body to reflect scattered radiations generated by the first antenna body to increase broadband, and at least two beveled edges are formed at a side of the first antenna body to increase peak gain. The antenna structure is a PIFA antenna, and the folding portion is upwardly extended toward the first antenna body, thereby completely reflecting scattered radiations.

Abstract: A wireless transmission system is provided for receiving a wireless signal in a wireless electronic device. The wireless transmission system includes a first antenna for vertical polarization, a second antenna for horizontal polarization, a sensor module for sensing pose status of the wireless electronic device and generating a control signal, and a controllable switch coupled to the first antenna and the second antenna for selecting one of the first antenna and the second antenna as an active antenna for receiving the wireless signal according to the control signal. With the aid of the two antennas, signal that comes from any direction can be received efficiently. Furthermore, one omni-directional antenna is used for transmitting signal. All the antennas are internal, and have better throughput performance than external antennas.