Abstract: A modulation method for a direct current (DC) coupling converter with less DC voltage sensors includes: obtaining a voltage modulated wave vr* and a current reference value ig* of the DC coupling converter; performing judgment on the voltage modulated wave vr* and the current reference value ig*, and determining a switch state of the DC coupling converter based on a result of the judgment; and when a DC voltage sensor of an electrolytic capacitor of an intermediate power module is removed, modulating a DC voltage sensor based on the voltage modulated wave vr* and a difference between DC voltages on electrolytic capacitors of the other two power modules. When the intermediate DC-side voltage sensor is removed, DC voltages of various modules of a converter system of a DC coupling power unit can still be balanced, and quality of a grid-connected current is not affected by a fault.

Abstract: Disclosed is an optical detection system for detecting a decomposition product of a high-voltage device, including: a measurement gas chamber and a measurement host. The measurement gas chamber is disposed on the high-voltage device and is in communication with a gas chamber of the high-voltage device, a collimator and a reflector are disposed on two sides of the measurement gas chamber respectively, and the measurement host is connected to the collimator. The collimator is used for emitting measurement laser to the measurement gas chamber according to a laser signal sent by the measurement host, and receiving reflected laser from the reflector and transmitting the reflected laser to the measurement host. In the present invention, data collection and backhaul between a measurement host and a measurement gas chamber are implemented through a laser signal, thus avoiding electromagnetic interference and improving the safety of measurement for a high-voltage device.

Abstract: Disclosed is an optical detection system for detecting a decomposition product of a high-voltage device, including: a measurement gas chamber and a measurement host. The measurement gas chamber is disposed on the high-voltage device and is in communication with a gas chamber of the high-voltage device, a collimator and a reflector are disposed on two sides of the measurement gas chamber respectively, and the measurement host is connected to the collimator. The collimator is used for emitting measurement laser to the measurement gas chamber according to a laser signal sent by the measurement host, and receiving reflected laser from the reflector and transmitting the reflected laser to the measurement host. In the present invention, data collection and backhaul between a measurement host and a measurement gas chamber are implemented through a laser signal, thus avoiding electromagnetic interference and improving the safety of measurement for a high-voltage device.

Abstract: An instant heating smart milk maker includes a body, and a powdered milk charge metering device, a powdered milk brewing device, a water tank, a hot water supply device, a control circuit board, and a powdered milk feeder drive device mounted on the body. The hot water supply device and the powdered milk feeder drive device are electrically connected to the control circuit board. The powdered milk charge metering device includes a driving shaft, a powdered milk supply impeller and a powdered milk box. The powdered milk supply impeller is connected to the powdered milk feeder drive device in a transmission way through the driving shaft. An powdered milk inlet of the powdered milk brewing device is connected to a powdered milk outlet of the powdered milk box. The water tank is connected to a water inlet of the hot water supply device.

Abstract: The present disclosure provides a vacuum cleaning robot with vision navigation function and navigation method thereof The vacuum cleaning robot comprises a cleaning body and a vision navigation controller. The cleaning body comprises a sense unit, a drive unit, and a drive control unit. The vision navigation controller comprises a vision capture unit, a storage unit, and a path navigation control unit. The vision capture unit is configured to capture the related vision information, and the related vision information constitutes the map information comprising the partial map and the global map of the current room; the path navigation control unit is configured to make a path navigation instruction according to the vision information, the map information, and the sense information; and the drive control unit is configured to control the drive unit according to the path navigation instruction.