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Hengchun Mao

from Allen, TX
Age ~61
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Also known as:
Hengchu Mao, Mao Hengchun, M Mao
Related to:
Ted T MaoJia Xuezhong, 56
Connected to:
Angela F Mao, 38Baodong Mao, 42Calvin K Mao, 35Carolyn Mao, 34Cathy S Mao, 40Changshi Mao, 59Chengde Mao, 60Cody V Mao, 28Cui L Mao, 67Cuiping Mao, 38

Hengchun Mao Phones & Addresses

  • Allen, TX
  • Richardson, TX
  • 3108 Buena Vista Dr, Plano, TX 75025 (972) 491-2422
  • 301 Loudon Rd, Blacksburg, VA 24060
  • Dallas, TX
  • Colton, TX
  • 1707 Lexington Ave, Allen, TX 75013 (972) 814-4680

Work

Company: Netpower technologies Position: Cto

Education

Degree: Graduate or professional degree

Industries

Electrical/Electronic Manufacturing

Resumes

Resumes

Hengchun Mao Photo 1

Chief Technology Officer

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Location:
1680 Prospect Dr, Richardson, TX 75081
Industry:
Electrical/Electronic Manufacturing
Work:
NetPower Technologies
CTO

Business Records

Name / Title
Company / Classification
Phones & Addresses
Hengchun Mao
Manager, Director
POWEREST, LLC
Business Services at Non-Commercial Site · Nonclassifiable Establishments
1707 Lexington Ave, Allen, TX 75013
3420 Black Cyn Dr, Plano, TX 75025
Hengchun Mao
Director , Chief Technology Off, CTO
NetPower Technologies, Inc.
Electrical/Electronic Manufacturing · Mfg Electronic Components · Electronic Components, NEC
1680 Prospect Dr STE 200, Richardson, TX 75081
(972) 509-2700, (972) 560-0500

Publications

Us Patents

Controller For Power Factor Corrector And Method Of Operation Thereof

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US Patent:
6388429, May 14, 2002
Filed:
Mar 9, 2000
Appl. No.:
09/522147
Inventors:
Hengchun Mao - Plano TX, 75025
International Classification:
G05F 110
US Classification:
323222, 363 89
Abstract:
A controller for a power factor corrector (PFC), having a controllable switch and operable in a discontinuous conduction mode (DCM), and a method of controlling the controllable switch. In one embodiment, the controller includes: (1) a drive circuit adapted to drive the controllable switch and (2) a current mode control circuit adapted to sense a current of the PFC and develop a current control signal based thereon. The drive circuit reduces a duty cycle of the controllable switch based on the current control signal to reduce input current distortion in the PFC.

Method And Circuit For Reducing Voltage Level Variation In A Bias Voltage In A Power Converter

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US Patent:
6466461, Oct 15, 2002
Filed:
Feb 7, 2002
Appl. No.:
10/068252
Inventors:
Hengchun Mao - Plano TX
Yimin Jiang - Plano TX
Assignee:
NetPower Technologies, Inc.
International Classification:
H02M 3335
US Classification:
363 2108
Abstract:
Circuit and method for reducing voltage level variation in a bias voltage generated in a power converter device are provided. The method allows providing a first voltage source configured to supply a first voltage during one respective mode of operation of the power converter, wherein the level of the voltage supplied by the first voltage source is directly proportional to variation in an input voltage of the converter device. The method further allows providing a second voltage source configured to supply a second voltage during another respective mode of operation of the power converter, wherein the level of the voltage supplied by the second voltage source has a generally inverse proportional relationship relative to variation in the input voltage of the converter device. At least one circuit parameter is selected in the voltage sources to adjust the respective levels of the first and second voltages. The first and second voltages are combined with one another to generate a combined voltage that comprises the bias voltage in the power converter device, the combined voltage resulting in a bias voltage level being relatively impervious to variation in the input voltage of the converter device.

Energy Recovery Snubber Circuit For Bidirectional Power Converter And Method Of Operation Thereof

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US Patent:
6501194, Dec 31, 2002
Filed:
Aug 31, 2000
Appl. No.:
09/652887
Inventors:
Yimin Jiang - Plano TX
Hengchun Mao - Plano TX
Assignee:
Lucent Technologies Inc. - Murray Hill NJ
International Classification:
H02J 700
US Classification:
307 66, 307 80, 307104, 307151, 363 15, 363 17
Abstract:
An energy recovery snubber circuit for a bidirectional power converter, a method of operation thereof and a power plant employing the bidirectional power converter. The bidirectional power converter has first and second inputs, an inductor coupled to the first input and a power switch coupled between the inductor and the second input. In one embodiment, the energy recovery snubber circuit includes: (1) a clamping capacitor coupled to the second input; (2) a clamping diode coupled between the clamping capacitor and the first input; and (3) a snubber inductor coupled to a node between the clamping capacitor and the clamping diode.

Plural Power Converters With Individual Conditioned Error Signals Shared On A Current Sharing Bus

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US Patent:
6574124, Jun 3, 2003
Filed:
Sep 11, 2002
Appl. No.:
10/242558
Inventors:
Feng Lin - Plano TX
Ning Sun - Plano TX
Hengchun Mao - Plano TX
Yimin Jiang - Plano TX
Assignee:
Netpower Technologies, Inc. - Plano TX
International Classification:
H02M 3335
US Classification:
363 65, 363 72, 363 97
Abstract:
A power distribution system is provided including current sharing circuitry, current sensing and over-current protection. The system includes a plurality of power converter modules each having a current sharing signal terminal on an input side and power output terminals on an output side, the corresponding power output terminals of the several modules being connected together and adapted to power a common load; an interconnecting signal bus coupled across the current sharing signal terminals on the input side; a plurality of feedback circuits, each of which is associated with one of said modules, each feedback circuit including a comparator (error amplifier) for comparing a feedback voltage on the output side with a reference voltage to provide an error signal to the input side; the error signal conditioned to provide a current command signal to said signal bus, wherein the signal bus provides a common current command signal to drive the power converter modules.

Power Converter Including Circuits For Improved Operational Control Of Synchronous Rectifiers Therein

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US Patent:
6674658, Jan 6, 2004
Filed:
Feb 1, 2002
Appl. No.:
10/062639
Inventors:
Hengchun Mao - Plano TX
Yimin Jiang - Plano TX
Assignee:
Netpower Technologies, Inc. - Plano TX
International Classification:
H02M 3335
US Classification:
363127, 363 2106, 363 2114
Abstract:
A power converter device using synchronous rectifiers and method for controlling operation thereof are provided. A first synchronous rectifier is coupled to the secondary transformer winding to pass a voltage induced at the secondary winding in response to an input voltage supplied to the primary transformer winding during an on-state of a main power switch. A first drive circuit is coupled to the gate terminal of the first synchronous rectifier to selectively activate and deactivate the first rectifier in correspondence with the respective on and off states of the main power switch based on a gate voltage supplied by the first drive circuit, with at least one circuit parameter being selected in the first drive circuit for maintaining the gate voltage within a predefined range regardless of variation in the level of the input voltage.

Soft Start For A Synchronous Rectifier In A Power Converter

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US Patent:
6760235, Jul 6, 2004
Filed:
Sep 11, 2002
Appl. No.:
10/241336
Inventors:
Feng Lin - Plano TX
Ning Sun - Plano TX
Hengchun Mao - Plano TX
Yimin Jiang - Plano TX
Assignee:
Netpower Technologies, Inc. - Plano TX
International Classification:
H02M 3335
US Classification:
363 2106, 363 49
Abstract:
Circuit and method for controlling circuitry in a power converter device during a soft-start process is provided. Synchronous rectifier control circuitry is adapted to gradually apply a gate drive signal derived from the main switch of the power converter device to a freewheeling synchronous rectifier of the switching circuitry during the soft-start process. The control circuitry gradually releases the amplitude or the pulse-width of the gate drive signal to the freewheeling synchronous rectifier to avoid a large duty ratio in the synchronous rectifier during start-up so that a negative current does not build up in the output inductor.

High Efficiency Bridgeless Pfc Converter And Method

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US Patent:
8385032, Feb 26, 2013
Filed:
Aug 23, 2011
Appl. No.:
13/216081
Inventors:
Hengchun Mao - Plano TX, US
Dianbo Fu - Plano TX, US
Bing Cai - Richardson TX, US
Assignee:
Futurewei Technologies, Inc. - Plano TX
International Classification:
H02H 7/00
H02H 9/00
H02H 3/20
H02H 9/04
H02H 3/22
US Classification:
361 18, 361 911, 361111
Abstract:
An embodiment bridgeless power factor correction circuit comprises a first boost converter and a second boost converter connected in parallel. A first switch is coupled between the input of the first boost converter and ground. A second switch is coupled between the input of the second boost converter and ground. Both the first switch and the second switch help to reduce the common mode noise of the bridgeless power factor correction circuit. The bridgeless power factor correction circuit further comprises two surge protection diodes coupled between the inputs of two boost converters and the output of the bridgeless power factor correction circuit.

Soft Switching Dc/Dc Converters And Methods

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US Patent:
8564984, Oct 22, 2013
Filed:
Dec 10, 2010
Appl. No.:
12/964925
Inventors:
Hengchun Mao - Plano TX, US
Dianbo Fu - Richardson TX, US
Zhaozheng Hou - Shenzhen, CN
Xujun Liu - Shenzhen, CN
Bing Cai - Richardson TX, US
Assignee:
Futurewei Technologies, Inc. - Plano TX
International Classification:
H02H 7/122
H02M 3/335
US Classification:
363 5602, 363 2102
Abstract:
A soft switching apparatus comprises an energy recovery channel formed by two diodes in series connection and a resonant tank formed by an inductor and a capacitor. The soft switching apparatus is coupled to the primary side of a bridge converter. An energy transfer process during L-C resonance helps to reduce the amplitude of the current flowing through the inductor in a freewheeling period. Furthermore, the soft switching apparatus can help to reduce the voltage stress across the secondary switching devices as well as the shoot-through currents flowing through the secondary switching devices, and thus enabling the reduction or elimination of dead time in a secondary synchronous rectifier control scheme.
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Hengchun Mao from Allen, TX, age ~61 Get Report