Abstract: A counter-rotating fan includes a frame, an inlet fan, and an output fan. The inlet fan is disposed in the frame. The inlet fan includes an inlet body and a plurality of inlet blades. The inlet blades are spaced apart from each other and disposed around the inlet body. The output fan is disposed in the frame and opposite to the inlet fan. The output fan includes an output body and a plurality of output blades. The output blades are spaced apart from each other and disposed around the output body. A rotational direction of the output blades is opposite to a rotational direction of the inlet blades, an end of each o output blade away from the output body curves towards the inlet blades. The present disclosure further provides a heat dissipating device.

Abstract: An impeller for heat dissipation fan includes a hub and blades, the blades are arranged around the hub. An inlet side and an outlet side, in an axial direction of the impeller, the inlet side is defined at an end of the impeller, the outlet side is defined at another end of the impeller. Each of the blades comprises a windward surface and a leeward surface opposite to the windward surface, the side of the blade back from the hub is an outer edge, and the side of the blade corresponding to the inlet side is a front edge, a first connection region is connected between the outer edge and the front edge, and the first connection region is arc-shaped where the windward surface connected to the leeward surface.

Abstract: A single-phase motor with positive and negative turn detection, including a rotor assembly, a master hall element, a secondary hall element, and a control assembly. The rotor assembly includes a magnetic ring and a permanent magnet. The magnetic ring includes magnetic strips that are connected end to end. The permanent magnet includes a plurality of magnetic ends. The master hall element is located at a lead position of the permanent magnet. A jitter point is defined between one magnetic end corresponding to the master hall element and one magnetic end adjacent to the master hall element in the clockwise direction. The secondary hall element is located on a side facing the counter clockwise direction of the master hall element. A first angle between the secondary hall element and the master hall element is greater than a second angle between the jitter point and the lead position.

Abstract: A circuit board with anti-corrosion properties, a method for manufacturing the circuit board, and an electronic device are provided. The circuit board includes a circuit substrate, a first protective layer, and a second protective layer. The circuit substrate includes a base layer and an outer wiring layer formed on the base layer. The circuit substrate further defines a via hole connected to the outer wiring layer. The first protective layer is formed on the outer wiring layer and an inner sidewall of the via hole, and is made of a white oil. The second protective layer is formed on the first protective layer.

Abstract: A method for controlling fans arranged in different working areas comprises: presetting a plurality of fan operation frequencies, receiving a fan operation request and adjusting a frequency of a pulse width modulation (PWM) controller to a first objective frequency based on the fan operation request, and sending the first objective frequency to the fans arranged in different working areas, to drive a first fan arranged in a first objective working area to run. Each of the plurality of fan operation frequencies corresponds to different working areas, the first objective frequency is one of the plurality of fan operation frequencies, and the first objective working area is one of the plurality of working areas corresponding to the first objective frequency. A system for controlling fans and an electronic device are also disclosed.

Abstract: A fan with increased heat-removing ability and reduced noise in operation includes a hub, a baffle, a first blade layer, and a second blade layer. The first blade layer includes a plurality of first blades, and the second blade layer includes a plurality of second blades. An orthogonal projection of each of the plurality of first blades on the baffle is located between orthogonal projections of adjacent two of the plurality of second blades on the baffle. A length of the plurality of first blades is greater or less than a length of the plurality of second blades to avoid any resonance. An electronic device including the fan is also disclosed.

Abstract: A method for controlling fans arranged in different working areas comprises: presetting a plurality of fan operation frequencies, receiving a fan operation request and adjusting a frequency of a pulse width modulation (PWM) controller to a first objective frequency based on the fan operation request, and sending the first objective frequency to the fans arranged in different working areas, to drive a first fan arranged in a first objective working area to run. Each of the plurality of fan operation frequencies corresponds to different working areas, the first objective frequency is one of the plurality of fan operation frequencies, and the first objective working area is one of the plurality of working areas corresponding to the first objective frequency. A system for controlling fans and an electronic device are also disclosed.

Abstract: An impeller for heat dissipation fan includes a hub and blades, the blades are arranged around the hub. An inlet side and an outlet side, in an axial direction of the impeller, the inlet side is defined at an end of the impeller, the outlet side is defined at another end of the impeller. Each of the blades comprises a windward surface and a leeward surface opposite to the windward surface, the side of the blade back from the hub is an outer edge, and the side of the blade corresponding to the inlet side is a front edge, a first connection region is connected between the outer edge and the front edge, and the first connection region is arc-shaped where the windward surface connected to the leeward surface.

Abstract: A circuit board with anti-corrosion properties, a method for manufacturing the circuit board, and an electronic device are provided. The circuit board includes a circuit substrate, a first protective layer, and a second protective layer. The circuit substrate includes a base layer and an outer wiring layer formed on the base layer. The circuit substrate further defines a via hole connected to the outer wiring layer. The first protective layer is formed on the outer wiring layer and an inner sidewall of the via hole, and is made of a white oil. The second protective layer is formed on the first protective layer.

Abstract: A fan frame includes a central base, a frame wall, and a plurality of static blades radially extending from the central base to the frame wall, each static blade is connected to the central base at a first end and connected to the frame wall at a second end, the central base is provided with a first wire groove, the frame wall is provided with a second wire groove, the first wire groove and the second wire groove are configured for accommodating wires, and the second wire groove has a shape same as the second end of the static blade connected to the frame wall for gathering the wires to shape similar to the static blade. A fan assembly including the fan frame is also disclosed.

Abstract: A circuit board with anti-corrosion properties, a method for manufacturing the circuit board, and an electronic device are provided. The circuit board includes a circuit substrate, a first protective layer, and a second protective layer. The circuit substrate includes a base layer and an outer wiring layer formed on the base layer. The circuit substrate further defines a via hole connected to the outer wiring layer. The first protective layer is formed on the outer wiring layer and an inner sidewall of the via hole, and is made of a white oil. The second protective layer is formed on the first protective layer.

Abstract: A fan with increased heat-removing ability and reduced noise in operation includes a hub, a baffle, a first blade layer, and a second blade layer. The first blade layer includes a plurality of first blades, and the second blade layer includes a plurality of second blades. An orthogonal projection of each of the plurality of first blades on the baffle is located between orthogonal projections of adjacent two of the plurality of second blades on the baffle. A length of the plurality of first blades is greater or less than a length of the plurality of second blades to avoid any resonance. An electronic device including the fan is also disclosed.

Abstract: A fan frame with an improved heat dissipation performance includes a frame body, a plurality of stationary blades, and a central base. The frame body defines a flow channel, the central base is arranged within the flow channel and divides the flow channel into flowing zones. Each of the flowing zone includes a high-pressure zone and a low-pressure zone. The central base defines first slot, second slot and receiving groove between the first slot and the second slot, the first slot communicates the high-pressure zone and the receiving groove, the second slot communicates the low-pressure zone and the receiving groove.

Abstract: An oil bearing structure of a fan includes a shaft seat, a rotating shaft, and an oil bearing. The shaft seat includes a boss. A middle portion of the boss defines a slot. One end of the rotating shaft is inserted into the slot. Another end of the rotating shaft is a free end. The oil bearing is sleeved on an outer periphery of the rotating shaft. An axis of the rotating shaft and an axis of the oil bearing are perpendicular to the shaft seat. An effective length of the oil bearing and the rotating shaft is 50%-70% of a length of the fan.

Abstract: A cooling fan creating a more stable airflow for heat-removing purposes, with reduced noise of operation, comprises a rotor hub and preferably an odd number of blades mounted on periphery of the rotor hub in unequal intervals. Adjacent blades are configured with different shapes, reducing the noise generated during operation without affecting the cooling effect.

Abstract: A three-bladed impeller providing a cooling airflow in air, with increased heat-dissipating efficiency and reduced noise includes a hub and three blades, the blades are arranged around the hub. Each blade is arched along its axial length from the front of fan to the back and also arched radially from the hub end of each blade to the outside tip. The back edge of each blade includes first and second slots, arranged alternately, the width of each first slot is ?1, the width of each of each second slot is ?2, the comparative sizes between ?2 and ?1 are in a ratio range of 1.6:1 to 1.8:1 (?2:?1).

Abstract: A circuit board with anti-corrosion properties, a method for manufacturing the circuit board, and an electronic device are provided. The circuit board includes a circuit substrate, a first protective layer, and a second protective layer. The circuit substrate includes a base layer and an outer wiring layer formed on the base layer. The circuit substrate further defines a via hole connected to the outer wiring layer. The first protective layer is formed on the outer wiring layer and an inner sidewall of the via hole, and is made of a white oil. The second protective layer is formed on the first protective layer.

Abstract: A fan frame with an improved heat dissipation performance includes a frame body, a plurality of stationary blades, and a central base. The frame body defines a flow channel, the central base is arranged within the flow channel and divides the flow channel into flowing zones. Each of the flowing zone includes a high-pressure zone and a low-pressure zone. The central base defines first slot, second slot and receiving groove between the first slot and the second slot, the first slot communicates the high-pressure zone and the receiving groove, the second slot communicates the low-pressure zone and the receiving groove.

Abstract: A three-bladed impeller providing a cooling airflow in air, with increased heat-dissipating efficiency and reduced noise includes a hub and three blades, the blades are arranged around the hub. Each blade is arched along its axial length from the front of fan to the back and also arched radially from the hub end of each blade to the outside tip. The back edge of each blade includes first and second slots, arranged alternately, the width of each first slot is ?1, the width of each of each second slot is ?2, the comparative sizes between ?2 and ?1 are in a ratio range of 1.6:1 to 1.8:1 (?2:?1).