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Xiaodong Zhan

from Westborough, MA
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Also known as:
X Zhen
Phone and address:
135 Main St, Westboro, MA 01581
Connected to:
Chang Zhan, 52Dennis B Zhan, 31Eric Zhan, 30Ge Zhan, 46Henry T Zhan, 34Judy Zhan, 72Lan Zhan, 26Liang L Zhan, 67Mingjiang Zhan, 44Qimin Zhan, 65

Xiaodong Zhan Phones & Addresses

  • 135 Main St, Westborough, MA 01581
  • 16B Mayberry Dr, Westborough, MA 01581
  • 7821 Case Dr, Plano, TX 75025
  • Colton, TX
  • Richardson, TX
  • McKinney, TX
  • Blacksburg, VA

Publications

Us Patents

Inrush Current Limiter For An Led Driver

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US Patent:
8339055, Dec 25, 2012
Filed:
Jun 24, 2010
Appl. No.:
12/822290
Inventors:
Xiaodong Zhan - Plano TX, US
Fred F. Greenfeld - Nederland CO, US
Xiangxu Yu - Shenzhen, CN
Assignee:
Intersil Americas Inc. - Milpitas CA
International Classification:
H05B 37/00
US Classification:
315219, 315276, 315307
Abstract:
An inrush current limiter for use with an LED driver including a current limiting device, a bypass switch device, and a switch drive. The current limiting device is placed in the input current path of the LED driver to limit input current to a predetermined maximum level in response to an AC conductive angle modulated voltage. The bypass switch device is coupled in parallel with the current limit device. The switch drive turns on the bypass switch device to at least partially bypass the current limiting device as a voltage level of an input of a switching converter rises. The input current remains sufficiently high without exceeding the maximum level. The switch drive is implemented with a delay network driven either by a separate transformer winding or by a snubber network. The delay network may have a delay based on the delay caused by the current limiting device.

Led Driver With Open Loop Dimming Control

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US Patent:
8344657, Jan 1, 2013
Filed:
Apr 30, 2010
Appl. No.:
12/770993
Inventors:
Xiaodong Zhan - Plano TX, US
Fred Greenfeld - Nederland CO, US
Xiangxu Yu - Shenzhen, CN
Assignee:
Intersil Americas Inc. - Milpitas CA
International Classification:
H05B 41/36
US Classification:
315302, 315291, 315299, 315307, 315312
Abstract:
An LED driver with open loop dimming including a full wave rectifier circuit, a DC/DC converter, and an oscillator circuit. The rectifier is configured to receive an input voltage in the form of an AC conductive angle modulated voltage and to provide a rectified voltage. The DC/DC converter converts the rectified voltage to an output voltage and an output current, where the output current has a magnitude which varies proportionately with a square of a quadratic mean of the input voltage. The oscillator circuit controls switching of the DC/DC converter with constant frequency and constant duty cycle. The DC/DC converter may be a flyback converter and may include a transformer operated in DCM. The driver may include output voltage and/or output current limit. The output current may be limited when the input voltage is within normal operating range of an AC line voltage from which the input voltage is derived.

Bias And Discharge System For Low Power Loss Start Up And Input Capacitance Discharge

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US Patent:
8416553, Apr 9, 2013
Filed:
May 26, 2010
Appl. No.:
12/788096
Inventors:
Xiaodong Zhan - Plano TX, US
Zhixiang Liang - San Ramon CA, US
Xiangxu Yu - Shenzhen, CN
Assignee:
Intersil Americas Inc. - Milpitas CA
International Classification:
H01H 47/00
US Classification:
361220
Abstract:
A power supply including an AC input, a filter, a full wave rectifier, a converter, a second rectifier, and a bias system. The filter includes at least one differential capacitor coupled to the AC input. The full wave rectifier develops a DC bus voltage on a DC bus node. The converter includes a controller and operates to convert the DC bus voltage to a regulated output voltage. The second rectifier is coupled to the AC input for developing a DC bias voltage on a DC bias node. The bias system is coupled between the DC bias node and a reference node and provides at least one start-up voltage to the controller, such as a supply voltage or a sense voltage or the like. The bias circuit includes at least one current discharge path for discharging each differential capacitor within a predetermined time period when AC line voltage is removed.

Power Supply With Low Power Consumption Hiccup Standby Operation

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US Patent:
8416584, Apr 9, 2013
Filed:
May 26, 2010
Appl. No.:
12/788045
Inventors:
Xiaodong Zhan - Plano TX, US
David B. Bell - Los Altos Hills CA, US
Zhixiang Liang - San Ramon CA, US
Xiangxu Yu - Shenzhen, CN
Assignee:
Intersil Americas Inc. - Milpitas CA
International Classification:
H02M 3/335
US Classification:
363 2112
Abstract:
A power supply including a converter, a capacitance, and a hiccup control module. The converter converts an input voltage to both an output voltage and a preliminary standby voltage when in its active state. The capacitance stores the preliminary standby voltage which is charged to an upper voltage level when the converter is in its active state and which is discharged to a lower voltage level when the converter is in its inactive state. During the standby mode, the hiccup control module operates the converter in hiccup mode by toggling between placing the converter into its inactive state when the preliminary standby voltage is charged to the upper voltage level and placing the converter into its active state when the preliminary standby voltage is discharged to the lower voltage level. The hiccup mode of the power supply eliminates a need for a separate standby converter.

Inrush Current Control

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US Patent:
8422179, Apr 16, 2013
Filed:
Jul 14, 2010
Appl. No.:
12/836153
Inventors:
Xiaodong (David) Zhan - Plano TX, US
Xiangxu (Alan) Yu - Shenzhen, CN
Assignee:
Intersil Americas Inc. - Milpitas CA
International Classification:
H02H 9/08
US Classification:
361 18, 361 939
Abstract:
An inrush current control circuit selectively short-circuit bypasses an inrush current limiting resistor (R) of a power supply that includes a switching transistor (Q) having a control terminal (gate or base) driven in dependence on a pulse width modulated (PWM) drive signal. The inrush current control circuit includes a bypass transistor (Q), a first resistor (R), a capacitor (C), a second resistor (R) and a diode (D), wherein an anode terminal of the diode (D) is connected to one of the terminals of the switching transistor (Q) of the power supply.

System And Method For Controlling Synchronous Switch For A Synchronous Converter

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US Patent:
20100315059, Dec 16, 2010
Filed:
Jan 27, 2010
Appl. No.:
12/694594
Inventors:
XIAODONG ZHAN - PLANO TX, US
Assignee:
INTERSIL AMERICAS INC. - MILPITAS CA
International Classification:
G05F 5/00
US Classification:
323299
Abstract:
An apparatus comprises a synchronous converter for providing a regulated output voltage responsive to an input voltage, a control PWM signal to a control switch of the synchronous converter and a synchronous PWM signal to a synchronous switch of the synchronous converter. A first circuit generates the control PWM signal and the synchronous PWM signal responsive to a PWM control signal. The first circuit limits a maximum duty cycle of the synchronous PWM signal to a predetermined level.

Dc/Dc Power Converter Having Active Self Driving Synchronous Rectification

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US Patent:
20110286245, Nov 24, 2011
Filed:
Jan 12, 2011
Appl. No.:
13/005188
Inventors:
XIAODONG ZHAN - PLANO TX, US
WEIHONG QIU - SAN JOSE CA, US
FRED GREENFELD - NEDERLAND CO, US
ZHIXIANG LIANG - SAN RAMON CA, US
Assignee:
INTERSIL AMERICAS INC. - MILPITAS CA
International Classification:
H02M 3/28
US Classification:
363 17
Abstract:
A DC/DC voltage converter includes a transformer having a primary side and a secondary side. Primary side circuitry is connected to the primary side and includes a first pair of switching transistors controlled responsive to first control signals from the primary side of the transformer and receiving an input voltage. Secondary side circuitry is connected to the secondary side and includes a second pair of switching transistors controlled responsive to second control signals from the secondary side of the transformer and providing an output voltage. Driver circuitry generates the second control signals responsive to drain and source voltages at each of the second pair of switching transistors and a first and second PWM control signals. Signal shaping circuitry provides the first and second PWM control signals responsive to a drain voltage of each of the second pair of switching transistors.

Clamp Circuits For Power Converters

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US Patent:
20140157015, Jun 5, 2014
Filed:
Aug 12, 2011
Appl. No.:
13/389198
Inventors:
Xiaodong (David) Zhan - Plano TX, US
Long (Robin) Yu - Hangzhou, CN
Shijia (Billy) Yang - Hangzhou, CN
Assignee:
INTERSIL AMERICAS INC. - Milpitas CA
International Classification:
H02M 3/335
G06F 1/32
US Classification:
713320, 363 17
Abstract:
A power converter comprises an input port configured to receive a source of power, an output port configured to provide output power, and a bridge circuit coupled to the input port. The bridge circuit comprises a first switch coupled in series with a second switch, and a third switch coupled in series with a fourth switch. A first clamp rectifier is coupled in series with a second clamp rectifier, and the first and second clamp rectifiers are coupled in parallel with the first and second switches. A first clamp capacitor is coupled between the first and second clamp rectifiers, with the first clamp capacitor operative to reduce power loss in the first and second clamp rectifiers. A first resonant inductor is coupled between the first and second switches. The power converter also includes a transformer operatively coupled to the bridge circuit, with the transformer comprising a primary winding and at least one secondary winding. A current rectifying circuit is operatively coupled to the secondary winding of the transformer and the output port.
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Xiaodong Zhan from Westborough, MA Get Report