Patents Assigned to Long Well Electronics Corp.
-
Patent number: 6731485Abstract: A digital electric power inverter comprising: a CPU, a PWM driving circuit, a PWM converting circuit, a rectifying circuit, an AC driving circuit, a DC/AC inverting circuit, an overload detecting circuit and an alarm circuit, the power inverter is characterized by that: the entire circuitry of the electric power inverter is designed to be controlled by the CPU that can accurately control these circuits to get an ability of high driving outputting.Type: GrantFiled: May 24, 2002Date of Patent: May 4, 2004Assignee: Long Well Electronics Corp.Inventor: Hong-Shung Liu
-
Patent number: 6646849Abstract: A digital electric power inverter comprising: a CPU, a PWM driving circuit, a PWM converting circuit, a rectifying circuit, an AC driving circuit, a DC/AC inverting circuit, a plurality of detecting circuits and an alarm circuit, the power inverter is characterized by that: the entire circuitry thereof is designed to be controlled by the CPU that can accurately control these circuits to endue the power inverter with an intact and multi-selection protecting function, thus render the parts thereof to develop their largest effects.Type: GrantFiled: May 24, 2002Date of Patent: November 11, 2003Assignee: Long Well Electronics Corp.Inventor: Hong-Chung Liu
-
Patent number: 6553711Abstract: Switchable mosquito expelling/killing device including a box body having a clip body for hanging the box body on a user's body. The box body is disposed with a pushing block, an electric mosquito incense mat insertion hole, gas releasing slots, DC socket and a switch. An oscillating circuit and a heater fixing seat, an electric heater and a cell for supplying power are disposed in the box body. The box body can be co-used with a transformer socket to be used indoors. By means of switching the switch outside the box body, the mosquito expelling/killing device can be switched between a mosquito expeller using the oscillating circuit to-generate a sound wave simulating the sound wave of male mosquitoes for expelling fertilized female mosquitoes and an electric mosquito incense device using the electric heater to heat electric mosquito incense mat for releasing mosquito-killing incense to kill the mosquitoes.Type: GrantFiled: October 27, 2000Date of Patent: April 29, 2003Assignee: Long Well Electronics Corp.Inventor: Hsiu-Mei Feng
-
Patent number: 6293044Abstract: Switchable mosquito expelling/killing device including a box body having a clip for hanging the box body on a user's body. The box body is disposed with a pushing block, an electric mosquito incense mat insertion hole, gas releasing slots and a switch. An oscillating circuit and a heater fixing seat, an electric heater and a cell for supplying power are disposed in the box body. By means of switching the switch, the mosquito expelling/killing device can be switched between a mosquito expeller using the oscillating circuit to generate a sound wave simulating the sound wave of male mosquitoes for expelling fertilized female mosquitoes and an electric mosquito incense device using the electric heater to heat electric mosquito incense mat for releasing mosquito-killing incense to kill the mosquitoes.Type: GrantFiled: March 22, 2000Date of Patent: September 25, 2001Assignee: Long Well Electronics Corp.Inventor: Hsiu-Mei Feng
-
Patent number: 6064448Abstract: An induced AC power source video amplifier includes a signal amplifying circuit, a transformer, and a plastic material shell. One end of the transformer is connected to a metal AC line input prong, and another end is connected to supply power to a signal amplifying circuit. The signal amplifying circuit and transformer are fixed to the plastic material shell so that the metal prong projects to the outside of the shell. The shell further includes input and output terminals and selective switches, including a gain select switch and an input select switch.Type: GrantFiled: May 13, 1998Date of Patent: May 16, 2000Assignee: Long Well Electronics Corp.Inventor: Hsiu Mei Feng
-
Patent number: 6060861Abstract: A car-used spare power system quick charging device including a switch, a boosting circuit, a detecting circuit, an indicating circuit, an unstable circuit, a pulse cutting circuit and multiple charging batteries. The detecting circuit serves to detect the voltage state of the charging battery. The indicating circuit serves to indicate the voltage state of the charging battery detected by the detecting circuit. The switch is used to switch the charging/discharging modes. When the charging battery is detected to be in middle or low voltage state, the boosting circuit serves to boost the charging battery into high voltage. The charging battery charges/discharges the car battery by way of pulse so as to protect the charging battery from damage due to over-heating and make the charging battery 100% release voltage.Type: GrantFiled: July 2, 1999Date of Patent: May 9, 2000Assignee: Long-Well Electronics Corp.Inventor: Hsiu-Mei Feng
-
Patent number: 6046908Abstract: A heat-radiating structure of power adapter, including an outer housing, a front sealing board, a rear sealing board, a circuit board, a heat-conducting member and a bottom board. At least one side of the circuit board is connected with a heat-conducting member. The heat-conducting member is disposed between multiple heat-conducting rubbers and the outer housing and padded by an insulative heat-conducting sheet. A metal plate formed with thread hole is together with the heat-conducting member screwed in the outer housing. The heat-conducting rubber and insulative heat-conducting sheet serve to evenly conduct the heat to the outer housing. The exhaustion fan serves to suck in air to cool the metal plate in the outer housing so as to greatly increase the heat-radiating area and achieve a better heat-radiating effect.Type: GrantFiled: September 4, 1998Date of Patent: April 4, 2000Assignee: Long Well Electronics Corp.Inventor: Hsiu-Mei Feng
-
Patent number: 5990783Abstract: An ozone/supersonic wave insect expelling device has an ozone generating circuit and a supersonic wave generating circuit which use the same power source so to generate supersonic wave for expelling pest insect, and for generating ozone for clearing the air. Therefore, ozone/supersonic wave insect expelling device has a dual effect.Type: GrantFiled: April 22, 1998Date of Patent: November 23, 1999Assignee: Long Well Electronics Corp.Inventor: Hsiu-Mei Feng
-
Patent number: 5930131Abstract: A controlling device for conversion of DC power to sine wave AC power, including a boosting circuit, a sine wave generating circuit, a PWM wave generating circuit, a drive module, an MOSFET output circuit, a filter circuit, a protection circuit and a feedback circuit. The MOSFET output circuit outputs PWM wave by all-bridge type, whereby the safety in operation of the circuit is ensured and sine wave AC current is output.Type: GrantFiled: May 28, 1998Date of Patent: July 27, 1999Assignee: Long Well Electronics Corp.Inventor: Hsiu-Mei Feng