Patents by Inventor Jeng-Shong Wang
Jeng-Shong Wang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20070139152Abstract: A balanced transformer having an auxiliary coil has a bobbin, a balanced coil set, a detective coil, and an iron core set. The balanced coil set and the detective coil is wound onto the bobbin. The iron core set penetrates through the bobbin. The balanced transformer can be used in a driving circuit of a backlight module of an LCD device. The balanced coil set is electrically connected to CCFLs of the backlight module. The detective coil is electrically connected to a protection circuit of the backlight module. When currents respectively passing through the CCFLs are not equal to each other, two ends of the detective coil induct a voltage to form a protection feedback signal transmitted to the protection circuit. Therefore, the balanced transformer is capable of detecting an unusual current, so as to further protect the balanced transformer and the driving circuit of the backlight module.Type: ApplicationFiled: December 21, 2005Publication date: June 21, 2007Inventors: Chun-Kong Chan, Jeng-Shong Wang, Chi-Ming Yang, Jin-Jiun Jiang
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Patent number: 7218062Abstract: A protective device and a CCFL driving system using the same are provided. The protective device employs a short detecting circuit to receive a high AC power at the high terminal of the CCFL through a step-down capacitor. The protective device outputs a short-circuit protective signal during a shorting event. A rectified diode receives high AC power through the step-down capacitor, and outputs high DC power. A first charging capacitor couples with the rectified diode, and generates a detecting voltage in response to the high DC power. An open detecting circuit, having a threshold, couples with the first charging capacitor. The open detecting circuit outputs an open-circuit protective signal when the detecting voltage is over the threshold. The protective device of the present invention has a lighting voltage-limited circuit, which couples with the first charging capacitor. The lighting voltage-limited circuit receives the detecting voltage, and outputs an over-voltage protective signal.Type: GrantFiled: April 25, 2006Date of Patent: May 15, 2007Assignee: Lien Chang Electronic Enterprise Co., Ltd.Inventors: Jeng-Shong Wang, Lien-Sung Tseng
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Publication number: 20070069662Abstract: The current-balancing circuit for lamps of the present invention adopts a plurality of transformers having a primary winding and a secondary winding. One end of the secondary winding of the transformer is connected with a lamp and another end of the secondary winding of the transformer is connected with an AC power via the primary winding of a neighboring transformer. By the above linking method, the power provides and balances the working current for the lamps via the transformers, and improves upon the drawbacks, including the inductance on the coils of the prior art being different and it not being able to be applied to lamps with an odd quantity and only can be applied to the lamps with an even quantity.Type: ApplicationFiled: September 29, 2005Publication date: March 29, 2007Inventors: Chun-Kong Chan, Jeng-Shong Wang
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Patent number: 7173836Abstract: A circuit making use of a push/pull-type control chip to drive a half bridge-type inverter circuit connects a drive circuit to a conventional half bridge-type inverter circuit, and has a push/pull-type control chip having two output terminals, a drive circuit having two input terminals and two output terminals, and a half bridge-type switch assembly having two electronic switches. The two input terminals of the drive circuit are connected with the two output terminals of the push/pull-type control chip and controlled by the push/pull-type control chip. Each of the two electronic switches of the half bridge-type switch assembly has a control terminal, which is connected to one of the two output terminals of the drive circuit and driven by the drive circuit for converting a DC power source into an AC power source sent to the primary side of a transformer.Type: GrantFiled: September 8, 2004Date of Patent: February 6, 2007Assignee: Lien Chang Electronic Enterprise Co., Ltd.Inventors: Chun-Kong Chan, Jeng-Shong Wang
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Publication number: 20070001621Abstract: The invention describes a multiple lamp balance transformer and a drive circuit. The multiple lamp balance transformer has two magnetic cores with a closed magnetic flux path and two coils wound around the closed magnetic flux path. The two coils have the same number of windings. The impedance property of the coil and Lenz's Law are used to balance the operating current of the lamps connected to the coils. The drive circuit has a multiple lamp balance transformer connected to several lamps, and a boost transformer uses a controller to supply the current and voltage to the lamps. A current detect/protect circuit connected to the coils and the controller detects the current passing through the coils and converts the operating current of the lamp into a voltage to be sent to the controller, so that the controller controls and provides sufficient power to the lamps.Type: ApplicationFiled: June 29, 2005Publication date: January 4, 2007Inventors: Chun-Kong Chan, Jeng-Shong Wang
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Publication number: 20070001622Abstract: The balance transformer with an auxiliary winding connecting to two CCFLs comprises a magnetic core that acts as a path for magnetic flux. The magnetic core is wound with a first coil, a second coil and an auxiliary coil. The winding direction of the first coil and the second coil are opposite. When the currents passing through the coils are balanced, there is no reaction voltage at the two ends of the auxiliary coil. When the currents of CCFLs are imbalanced or abnormal, the auxiliary coil produces a reaction voltage to act as a feedback signal for protecting the CCFLs.Type: ApplicationFiled: June 29, 2005Publication date: January 4, 2007Inventors: Chun-Kong Chan, Jeng-Shong Wang
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Patent number: 7067989Abstract: A modularized inverter control circuit makes use of a push-pull type control IC to connect other accessory circuit units, and is packaged and disposed on a printed circuit board to accomplish modularization for driving and control of various inverter circuits. The modularized inverter control circuit comprises a control IC for output of control signals, a lamp current feedback unit connected to the control IC and several lamps for getting working currents of the lamps, a turn-on voltage limit unit connected to the control IC and the lamps for getting working voltages of the lamps, a lamp protection unit connected to the control IC and the lamps and used for open-circuit and short-circuit protection of the lamps, a power source control unit connected to the control IC for providing an electric power, and a reference unit connected to the control IC for providing required reference values for the control IC.Type: GrantFiled: August 26, 2004Date of Patent: June 27, 2006Assignee: Lien Chang Electronic Enterprise Co., Ltd.Inventors: Chun-Kong Chan, Jeng-Shong Wang
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Patent number: 7064588Abstract: A circuit making use of a push/pull-type control chip to drive a half-bridge inverter of dual N-MOS connects a drive circuit to a conventional half-bridge inverter circuit, and has a push/pull-type control chip having two output terminals, a drive circuit having two input terminals and two output terminals, and a half-bridge switch assembly having a first N-MOS FET and a second N-MOS FET. The two input terminals of the drive circuit are connected with the two output terminals of the push/pull control chip and controlled by the push/pull-type control chip. Each of the two N-MOS FETs of the half-bridge switch assembly has a control terminal, which is connected to one of the two output terminals of the drive circuit and driven by the drive circuit for converting a DC power source into an AC power source sent to the primary side of a transformer.Type: GrantFiled: October 7, 2004Date of Patent: June 20, 2006Assignee: Lien Chang Eletronic Enterprise Co., Ltd.Inventors: Chun-Kong Chan, Jeng-Shong Wang
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Publication number: 20060119293Abstract: In a lamp load-sharing circuit, winding coils on one side of a plurality of transformers are connected to a plurality of lamps, and winding coils on the other side of the transformers are serially connected together to form a closed loop. The same current flows through the winding coils which are serially connected together to form a closed loop. Through the electromagnetic induction characteristic of the transformers, equal working currents are generated in the lamps connected to the winding coils on the other side of the transformers.Type: ApplicationFiled: December 3, 2004Publication date: June 8, 2006Inventors: Chun-Kong Chan, Jeng-Shong Wang
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Publication number: 20060076986Abstract: A circuit making use of a push/pull-type control chip to drive a half-bridge inverter of dual N-MOS connects a drive circuit to a conventional half-bridge inverter circuit, and has a push/pull-type control chip having two output terminals, a drive circuit having two input terminals and two output terminals, and a half-bridge switch assembly having a first N-MOS FET and a second N-MOS FET. The two input terminals of the drive circuit are connected with the two output terminals of the push/pull control chip and controlled by the push/pull-type control chip. Each of the two N-MOS FETs of the half-bridge switch assembly has a control terminal, which is connected to one of the two output terminals of the drive circuit and driven by the drive circuit for converting a DC power source into an AC power source sent to the primary side of a transformer.Type: ApplicationFiled: October 7, 2004Publication date: April 13, 2006Inventors: Chun-Kong Chan, Jeng-Shong Wang
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Publication number: 20060050542Abstract: A circuit making use of a push/pull-type control chip to drive a half bridge-type inverter circuit connects a drive circuit to a conventional half bridge-type inverter circuit, and has a push/pull-type control chip having two output terminals, a drive circuit having two input terminals and two output terminals, and a half bridge-type switch assembly having two electronic switches. The two input terminals of the drive circuit are connected with the two output terminals of the push/pull-type control chip and controlled by the push/pull-type control chip. Each of the two electronic switches of the half bridge-type switch assembly has a control terminal, which is connected to one of the two output terminals of the drive circuit and driven by the drive circuit for converting a DC power source into an AC power source sent to the primary side of a transformer.Type: ApplicationFiled: September 8, 2004Publication date: March 9, 2006Inventors: Chun-Kong Chan, Jeng-Shong Wang
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Publication number: 20060050543Abstract: A full bridge inverter with a push/pull control chip uses two similar drivers to connect to the prior art full bridge switch assembly, and controls the prior art full bridge switch assembly with the push/pull control chip. The full bridge inverter comprises a push/pull control chip with two output terminals. Two drivers both have an input terminal and an output terminal. The input terminal is connected to the output terminals of the push/pull control chip and a full bridge switch assembly with four electronic switches. Each electronic switch has a control terminal connected to the output terminal of the two drivers so as to convert DC power into AC power by the two drivers.Type: ApplicationFiled: September 8, 2004Publication date: March 9, 2006Inventors: Chun-Kong Chan, Jeng-Shong Wang
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Publication number: 20060043910Abstract: A modularized inverter control circuit makes use of a push-pull type control IC to connect other accessory circuit units, and is packaged and disposed on a printed circuit board to accomplish modularization for driving and control of various inverter circuits. The modularized inverter control circuit comprises a control IC for output of control signals, a lamp current feedback unit connected to the control IC and several lamps for getting working currents of the lamps, a turn-on voltage limit unit connected to the control IC and the lamps for getting working voltages of the lamps, a lamp protection unit connected to the control IC and the lamps and used for open-circuit and short-circuit protection of the lamps, a power source control unit connected to the control IC for providing an electric power, and a reference unit connected to the control IC for providing required reference values for the control IC.Type: ApplicationFiled: August 26, 2004Publication date: March 2, 2006Inventors: Chun-Kong Chan, Jeng-Shong Wang
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Patent number: 7002819Abstract: A half-bridge inverter achieves an inversion by switching an external-driven switch and a self-driven switch, and includes a transformer having a primary winding, a secondary winding and an auxiliary winding. The external-driven switch coupled to the first winding and ground is controlled by a square wave signal. The self-driven switch coupled to the primary winding, auxiliary winding and a DC power supply is controlled by an output voltage of the auxiliary winding. A resonant capacitor is coupled to the secondary winding. The square wave signal controls the switching of the external-driven switch, and the switching of the self-driven switch controlled by the output voltage of the auxiliary winding introduces DC power into the primary winding of the transformer while sensing an alternating voltage at the secondary winding of the transformer. A resonant capacitor filters harmonic waves into low-noise AC power to reduce interferences and supply power to a load.Type: GrantFiled: March 2, 2005Date of Patent: February 21, 2006Assignee: Lien Chang Electronic Enterprise Co., Ltd.Inventors: Chun-Kong Chan, Jeng-Shong Wang
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Patent number: 7002304Abstract: A multi-lamp drive device comprises a transformer, a drive circuit and at least a balanced inductor. The magnetic core of the transformer has a first side column, a second side column and at least a central column. A primary coil and a secondary coil are wound around the first side column and the second side column, respectively. The drive circuit can output an excitation power source to the transformer for driving lamps to be on based on the energy conversion characteristic of the transformer. With the help of the central column, the transformer can guide the counter magnetic flux generated by the load current without interfering the power conversion action of the transformer. Moreover, heat generated by the transformer due to a too larger load current can be reduced, and the protection function for the transformer during short circuit can also be accomplished.Type: GrantFiled: January 2, 2004Date of Patent: February 21, 2006Assignee: Lien Chang Electronic Enterprise Co., Ltd.Inventors: Chun-Kong Chan, Jeng-Shong Wang
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Publication number: 20050270132Abstract: A modified transformer structure has two U-shaped magnetic cores, a low-voltage side coil, a high-voltage side coil, and a C-shaped magnetic core. The two U-shaped magnetic cores and the C-shaped magnetic core are assembled with the low-voltage side coil and the high-voltage side coil, respectively. Through the C-shaped magnetic core, when a short circuit occurs in the high-voltage side coil of the transformer, power conversion of the low-voltage side coil is not affected, hence accomplishing short-circuit protection of the transformer. Moreover, the counter magnetomotive force generated at the low-voltage side coil of the transformer can be reduced through the C-shaped magnetic core, hence protecting the low-voltage side coil and also decreasing heat generated by the transformer.Type: ApplicationFiled: June 8, 2004Publication date: December 8, 2005Inventors: Chun-Kong Chan, Jeng-Shong Wang
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Publication number: 20050270133Abstract: An improved transformer structure has a low-voltage side coil, two high-voltage side coils, two E-shaped magnetic cores and a C-shaped magnetic core. The two E-shaped magnetic cores and the C-shaped magnetic core are assembled with the low-voltage side coil and the two high-voltage side coils, respectively. Through the C-shaped magnetic core, when a short circuit occurs in the high-voltage side coil of the transformer, power conversion of the low-voltage side coil is not affected, hence accomplishing short-circuit protection of the transformer. Moreover, the counter magnetomotive force generated at the low-voltage side coil of the transformer can be reduced through the C-shaped magnetic core, hence protecting the low-voltage side coil and also decreasing heat generated by the transformer.Type: ApplicationFiled: June 8, 2004Publication date: December 8, 2005Inventors: Chun-Kong Chan, Jeng-Shong Wang
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Publication number: 20050254207Abstract: The cooling means for a driver semiconductor according to this invention is formed on a circuit board, which has a top side and a rear side. The front side of the circuit board is formed with a driver semiconductor that is soldered on the circuit board. The driver semiconductor has a plurality of input pins and output pins; at least a cooling element is conductively connected to the output pins of the driver semiconductor via the conductive layer on the back of the circuit board. In this way, when the driver semiconductor is overdriven, the produced heat energy is conducted from the output pins, through the conductive layer to the jumpers, radiated into the air and transmitted to the next electrical component.Type: ApplicationFiled: May 17, 2004Publication date: November 17, 2005Inventors: Chun-Kong Chan, Jeng-Shong Wang, Min-Chi Liu
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Publication number: 20050200305Abstract: A multi-lamp drive device comprises a transformer, a drive circuit and at least a balanced inductor. The magnetic core of the transformer has a first side column, a second side column and at least a central column. A primary coil and a secondary coil are wound around the first side column and the second side column, respectively. The drive circuit can output an excitation power source to the transformer for driving lamps to be on based on the energy conversion characteristic of the transformer. With the help of the central column, the transformer can guide the counter magnetic flux generated by the load current without interfering the power conversion action of the transformer. Moreover, heat generated by the transformer due to a too larger load current can be reduced, and the protection function for the transformer during short circuit can also be accomplished.Type: ApplicationFiled: April 25, 2005Publication date: September 15, 2005Inventors: Chun-Kong Chan, Jeng-Shong Wang
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Publication number: 20050146286Abstract: A multi-lamp drive device comprises a transformer, a drive circuit and at least a balanced inductor. The magnetic core of the transformer has a first side column, a second side column and at least a central column. A primary coil and a secondary coil are wound around the first side column and the second side column, respectively. The drive circuit can output an excitation power source to the transformer for driving lamps to be on based on the energy conversion characteristic of the transformer. With the help of the central column, the transformer can guide the counter magnetic flux generated by the load current without interfering the power conversion action of the transformer. Moreover, heat generated by the transformer due to a too larger load current can be reduced, and the protection function for the transformer during short circuit can also be accomplished.Type: ApplicationFiled: January 2, 2004Publication date: July 7, 2005Inventors: Chun-Kong Chan, Jeng-Shong Wang