Patents by Inventor Hong-Jian Gan
Hong-Jian Gan 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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Patent number: 10084390Abstract: A power converter, short circuit protection circuit, and control method are disclosed herein. The power converter is configured to generate an output voltage and includes a semiconductor switch, a short circuit protection circuit, and a signal processing module. The semiconductor switch is configured to adjust the output voltage according to a driving signal. The short circuit protection circuit is configured to generate a short circuit protecting signal according to a control signal and a short circuit status of the semiconductor switch. The signal processing module is configured to generate the control signal and the driving signal according to a modulating signal, and to turn off the semiconductor switch according to the short circuit protecting signal. A delay duration is present between the modulating signal and the control signal, and the semiconductor switch is turned on during the delay duration.Type: GrantFiled: June 1, 2015Date of Patent: September 25, 2018Assignee: Delta Electronics (Shanghai) Co., Ltd.Inventors: Qing-Long Zhong, Yan Li, Hong-Jian Gan
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Patent number: 10009024Abstract: A driving device includes a driving primary circuit, an isolating transforming circuit, and at least one driving secondary circuit. The isolating transforming circuit is coupled to the driving primary circuit. The at least one driving secondary circuit is coupled to the isolating transforming circuit. The driving primary circuit receives a control signal and a power signal. The driving primary circuit generates a driving pulse signal according to the control signal and generates a power pulse signal according to the power signal. The driving primary circuit transmits the driving pulse signal and the power pulse signal to the at least one driving secondary circuit through the isolating transforming circuit. The at least one driving secondary circuit receives the driving pulse signal so as to generate a driving signal, and the at least one driving secondary circuit drives a power semiconductor switch unit according to the driving signal.Type: GrantFiled: June 16, 2015Date of Patent: June 26, 2018Assignee: DELTA ELECTRONICS (SHANGHAI) CO., LTD.Inventors: Hong-Jian Gan, Ming Wang, Jian-Ping Ying
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Patent number: 9989586Abstract: A converter circuit is provided. The converter circuit includes a capacitor module, bridge arms, a voltage measuring module and an open-circuit detection module. Each bridge arm is connected to the capacitor module in parallel and includes an upper arm and a lower bridge arm connected at a middle point. The voltage measuring module measures voltage differences between each two bridge arms. The open-circuit detection module transmits test impulse signals to the bridge arms to activate at least one upper-conducted bridge arm and at least one lower-conducted bridge arm. The open-circuit detection module retrieves the voltage differences of each pair of the upper-conducted and lower-conducted bridge arms to make comparison with a reference value to determine an operation state thereof, and makes comparison of the operation state determined according to the different groups of test impulse signals to determine whether the upper and the lower bridge arms are actually open circuit.Type: GrantFiled: April 9, 2015Date of Patent: June 5, 2018Assignee: DELTA ELECTRONICS (SHANGHAI) CO., LTD.Inventors: Liang Liu, Bo-Yu Pu, Yi Zhang, Hong-Jian Gan, Jian-Ping Ying
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Patent number: 9960592Abstract: A method for detecting a short circuit fault in a multi-level inverter circuit is provided. The multi-level inverter circuit includes a plurality of single phase branches each including of switches. The method includes steps outlined below. At least one detecting pulse sequence is transmitted to the switches of each of the single phase branches. Whether a conducting path is formed in any of the single phase branches is determined according to the detecting pulse sequence. When the conducting loop is formed, respective position of one or more malfunctioned switch in the single phase branches is located according to a path of the conducting loop. A short-circuit detection device and a three-phase three-level inverter circuit are also disclosed herein.Type: GrantFiled: May 13, 2015Date of Patent: May 1, 2018Assignee: DELTA ELECTRONICS (SHANGHAI) CO., LTD.Inventors: Liang Liu, Bo-Yu Pu, Yi Zhang, Hong-Jian Gan, Jian-Ping Ying
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Patent number: 9906010Abstract: A driving device is configured to drive a power semiconductor switch module based on a main control signal. The driving device includes a voltage-modulating unit and a driving module. When the voltage-modulating unit receives a protection signal, the voltage-modulating unit generates a turn-off pulse signal based on the protection signal. Moreover, the driving module is configured to turn off the power semiconductor switch module based on the turn-off pulse signal. Also disclosed herein is a driving method.Type: GrantFiled: May 28, 2015Date of Patent: February 27, 2018Assignee: DELTA ELECTRONICS (SHANGHAI) CO., LTD.Inventors: Tao Jiang, Li-Feng Qiao, Jian-Gang Huang, Yang-Yang Tao, Hong-Jian Gan
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Patent number: 9797932Abstract: A voltage sampling system is provided. The voltage sampling system includes a voltage sampling device, two optic-fiber transmission lines and a control device. The voltage sampling device includes a voltage-dividing resistor module, a common mode rejection circuit and an analog-to-digital converter. The voltage-dividing resistor module generates a first and a second divided voltages according to a voltage source. The common mode rejection circuit receives the first and the second divided voltages to perform a common-mode noise rejecting process to generate an output voltage. The analog-to-digital converter converts the output voltage to generate a digital data signal. The two optic-fiber transmission lines transmit the digital data signal and a clock signal respectively. The control device receives the digital data signal from the analog-to-digital converter and the clock signal to perform a digital data processing.Type: GrantFiled: April 23, 2015Date of Patent: October 24, 2017Assignee: DELTA ELECTRONICS (SHANGHAI) CO., LTD.Inventors: Bo-Yu Pu, Yi Zhang, Ming Wang, Hong-Jian Gan, Jian-Ping Ying
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Patent number: 9748831Abstract: A power conversion device includes a power semiconductor switch module, a driving signal-transmitting circuit, a plurality of failure-detecting circuits, a protection signal transmitting circuit and a control circuit. The driving signal transmitting circuit receives a control signal and generates a driving signal according to the control signal to drive the power semiconductor switch module. The failure detecting circuits generate a fault signal when they detect that one of the power semiconductor switches and/or the driving signal transmitting circuit is malfunctioning. The isolated pulse transforming unit of the protection signal transmitting circuit receives a corresponding fault pulse signal generated according to the fault signal, and outputs a protection pulse signal. The control circuit generates the control signal and receives a protection signal generated according to the protection pulse signal.Type: GrantFiled: June 16, 2015Date of Patent: August 29, 2017Assignee: DELTA ELECTRONICS (SHANGHAI) CO., LTD.Inventors: Hong-Jian Gan, Ming Wang, Jian-Ping Ying, Bing Zhang
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Patent number: 9685883Abstract: A three-level rectifier includes at least one phase bridge arm that includes an upper-half and a lower-half bridge arm circuit modules. The upper-half bridge arm circuit module includes a first diode unit and a second diode unit that are in series connection, and a first power semiconductor switch unit. The lower-half bridge arm circuit module includes a third diode unit and a fourth diode unit that are in series connection, and a second power semiconductor switch unit. These first and second power semiconductor switch units are connected to the neutral point of the capacitor unit; the second diode unit and the third diode unit are connected to the alternating-current terminal; the first diode unit and the fourth diode unit are respectively connected to the positive terminal and negative terminal of the direct-current bus. The two circuit modules are disposed side by side and facing each other.Type: GrantFiled: May 21, 2015Date of Patent: June 20, 2017Assignee: DELTA ELECTRONICS (SHANGHAI) CO., LTD.Inventors: Jian-Gang Huang, Bing Zhang, Yang-Yang Tao, Sen-Lin Wen, Li-Feng Qiao, Hong-Jian Gan, Jian-Ping Ying
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Patent number: 9667178Abstract: A variable frequency speed control system having a low voltage ride through function that includes a variable frequency drive having a rectifier, a DC bus and an inverter is provided. The variable frequency speed control system includes a voltage drop detecting module, a frequency control module, an operation mode selecting module and an inverter control module. The voltage drop detecting module generates a voltage drop coefficient according to a grid voltage and a rated grid voltage and generates an operation mode switching signal. The operation mode selecting module receives a target frequency signal and a frequency decreasing amount and generates an output frequency signal according to the operation mode switching signal. The inverter control module generates a three phase modulating signal according to the output frequency signal, which is used to control the operation of the inverter.Type: GrantFiled: May 12, 2015Date of Patent: May 30, 2017Assignee: DELTA ELECTRONICS (SHANGHAI) CO., LTD.Inventors: Bin Liu, Zheng Wang, Yi Zhang, Hong-Jian Gan, Jian-Ping Ying
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Patent number: 9667166Abstract: A five-level converting device includes a first switch module, a second switch module and a third switch modules each connects to a neutral point, a positive terminal and a negative terminal of a bus capacitor module. A first switch module includes a plurality of bidirectional switching circuits cascaded to each other, and each bidirectional switching circuit includes two first switching units reversely connected in series. Second switch module includes a plurality of second switching units connected in series. Third switch module includes a plurality of third switching units connected in series. A first flying capacitor unit is connected across the first switching module and a second switch module, and a second flying capacitor unit is connected across the first switching module and a third switching module. The first flying capacitor unit and the second flying capacitor unit are connected to different connection points between the first switch units respectively.Type: GrantFiled: April 21, 2016Date of Patent: May 30, 2017Assignee: Delta Electronics (Shanghai) Co., Ltd.Inventors: Hong-Jian Gan, Bo-Yu Pu, Ming Wang
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Patent number: 9658258Abstract: A voltage sampling system is provided. The voltage sampling system includes a first and a second input paths and a signal-processing module. The first input path includes a first input voltage-dividing resistor unit, a second input voltage-dividing resistor unit and a first DC voltage-dividing resistor unit to generate a first input divided voltage and a first DC bias voltage to further generate a first sampled voltage signal according to a first input voltage and a DC voltage source. The second input path includes a third input voltage-dividing resistor unit, a fourth input voltage-dividing resistor unit and a second DC voltage-dividing resistor unit to generate a second input divided voltage and a second DC bias voltage to further generate a second sampled voltage signal according to a second input voltage and the DC voltage source. The signal-processing module receives the first and the second sampled voltage signals to perform signal processing.Type: GrantFiled: June 8, 2015Date of Patent: May 23, 2017Assignee: DELTA ELECTRONICS (SHANGHAI) CO., LTD.Inventors: Hong-Jian Gan, Ming Wang, Bo-Yu Pu, Yi Zhang
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Patent number: 9634573Abstract: The disclosure provides a power converter including a cabinet, a first converter circuit module, a second converter circuit module, and a DC capacitor module. The first converter circuit module includes at least one first bridge arm. The second converter circuit module includes at least one second bridge arm. The first converter circuit module, the second converter circuit module, and the DC capacitor module are disposed in the cabinet. The second bridge arm and the first bridge arm are arranged side by side in parallel. The DC capacitor module is electrically connected between the first bridge arm and the second bridge arm, so that the first bridge arm and the second bridge arm share the DC capacitor module.Type: GrantFiled: May 22, 2015Date of Patent: April 25, 2017Assignee: DELTA ELECTRONICS (SHANGHAI) CO., LTD.Inventors: Sen-Lin Wen, Jian-Ping Ying, Hong-Jian Gan, Li-Feng Qiao
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Patent number: 9620292Abstract: A direct-current capacitor module is disclosed in this disclosure. The direct-current capacitor module includes a plurality of direct-current capacitors and a laminated busbar structure. The direct-current capacitors are grouped into a first portion and a second portion. The laminated busbar structure is electrically connected to capacitor binding posts of the direct-current capacitors. The laminated busbar structure has a positive terminal and a negative terminal. The laminated busbar structure includes a first busbar layer, a second busbar layer and an insulation layer. The first busbar layer includes a first sub-busbar layer, which is electrically connected between at least two direct-current capacitors of the first portion. The second busbar layer includes a second sub-busbar layer, which is electrically connected between at least two direct-current capacitors of the second portion. The insulation layer is disposed between the first busbar layer and the second busbar layer.Type: GrantFiled: May 22, 2015Date of Patent: April 11, 2017Assignee: DELTA ELECTRONICS (SHANGHAI) CO., LTD.Inventors: Sen-Lin Wen, Jian-Ping Ying, Hong-Jian Gan, She Zhao
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Patent number: 9602019Abstract: The present disclosure provides a voltage-adjusting device applied in a power conversion system including a Vienna rectifier, a direct current (DC) bus, and an inverter. The voltage-adjusting device includes a grid voltage sampling module for sampling a grid voltage, a given bus voltage calculation module, a voltage-adjusting module, a current control module and a pulse width modulation module. The given bus voltage calculation module calculates a given value of the DC bus voltage based on the grid voltage. The current control module receives a three phase AC current from the grid, the active current given signal and the reactive current given signal to output a three phase control voltage. The pulse width modulation module outputs a pulse control signal to the Vienna rectifier.Type: GrantFiled: May 12, 2015Date of Patent: March 21, 2017Assignee: DELTA ELECTRONICS (SHANGHAI) CO., LTD.Inventors: Zheng Wang, Yi Zhang, Hong-Jian Gan, Jian-Ping Ying
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Publication number: 20170012552Abstract: A five-level converting device includes a first switch module, a second switch module and a third switch modules each connects to a neutral point, a positive terminal and a negative terminal of a bus capacitor module. A first switch module includes a plurality of bidirectional switching circuits cascaded to each other, and each bidirectional switching circuit includes two first switching units reversely connected in series. Second switch module includes a plurality of second switching units connected in series. Third switch module includes a plurality of third switching units connected in series. A first flying capacitor unit is connected across the first switching module and a second switch module, and a second flying capacitor unit is connected across the first switching module and a third switching module. The first flying capacitor unit and the second flying capacitor unit are connected to different connection points between the first switch units respectively.Type: ApplicationFiled: April 21, 2016Publication date: January 12, 2017Inventors: Hong-Jian GAN, Bo-Yu PU, Ming WANG
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Patent number: 9473017Abstract: A control circuit, control method used in a PFC circuit and the power source system thereof are disclosed herein. The control circuit comprises: a zero current detection circuit having a polarity detection circuit for outputting a first and a second digital signals and a signal conversion circuit for generating an analog signal; a feedback circuit for generating a driving pulse signal; and a pulse distribution circuit for distributing the driving pulse signal to a first and a second switches according to the first and the second digital signal. After a switch cycle, one of the first and the second switch performs an ON operation for the next switch cycle when the current flowing through the inductor decreases to a predetermined threshold value, wherein an ON time of the first switch is equal in each switch cycle, and an ON time of the second switch is equal in each switch cycle.Type: GrantFiled: May 8, 2015Date of Patent: October 18, 2016Assignee: DELTA ELECTRONICS, INC.Inventors: Hong-Yuan Jin, De-Sheng Guo, Hong-Jian Gan, Jian-Ping Ying
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Patent number: 9236807Abstract: A DC/DC converter, a power converter and a control method thereof are disclosed, where the DC/DC converter includes an output circuit, a rectangular wave generator, a resonant tank, a detection unit and a control unit. The output circuit has a load. The rectangular wave generator converts an input voltage into at least one rectangular wave. The resonant tank provides a first voltage based on the rectangular wave for the output circuit. The detection unit detects a signal related to a state of the load. When the state of the load is light-load or a no-load, the control unit controls a working frequency or a duty ratio of the rectangular wave, so that the duty ratio of the rectangular wave is within a predetermined range, in which a voltage gain of the DC/DC converter is greater than another voltage gain under the condition of 50% duty ratio.Type: GrantFiled: March 22, 2012Date of Patent: January 12, 2016Assignee: DELTA ELECTRONICS (SHANGHAI) CO., LTD.Inventors: Hong-Yuan Jin, Pei-Qing Hu, Hong-Jian Gan, Jian-Ping Ying
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Publication number: 20150380922Abstract: A driving device is configured to drive a power semiconductor switch module based on a main control signal. The driving device includes a voltage-modulating unit and a driving module. When the voltage-modulating unit receives a protection signal, the voltage-modulating unit generates a turn-off pulse signal based on the protection signal. Moreover, the driving module is configured to turn off the power semiconductor switch module based on the turn-off pulse signal. Also disclosed herein is a driving method.Type: ApplicationFiled: May 28, 2015Publication date: December 31, 2015Inventors: Tao JIANG, Li-Feng QIAO, Jian-Gang HUANG, Yang-Yang TAO, Hong-Jian GAN
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Publication number: 20150381029Abstract: A power conversion device includes a power semiconductor switch module, a driving signal-transmitting circuit, a plurality of failure-detecting circuits, a protection signal transmitting circuit and a control circuit. The driving signal transmitting circuit receives a control signal and generates a driving signal according to the control signal to drive the power semiconductor switch module. The failure detecting circuits generate a fault signal when they detect that one of the power semiconductor switches and/or the driving signal transmitting circuit is malfunctioning. The isolated pulse transforming unit of the protection signal transmitting circuit receives a corresponding fault pulse signal generated according to the fault signal, and outputs a protection pulse signal. The control circuit generates the control signal and receives a protection signal generated according to the protection pulse signal.Type: ApplicationFiled: June 16, 2015Publication date: December 31, 2015Inventors: Hong-Jian GAN, Ming WANG, Jian-Ping YING, Bing ZHANG
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Publication number: 20150380926Abstract: A power converter, short circuit protection circuit, and control method are disclosed herein. The power converter is configured to generate an output voltage and includes a semiconductor switch, a short circuit protection circuit, and a signal processing module. The semiconductor switch is configured to adjust the output voltage according to a driving signal. The short circuit protection circuit is configured to generate a short circuit protecting signal according to a control signal and a short circuit status of the semiconductor switch. The signal processing module is configured to generate the control signal and the driving signal according to a modulating signal, and to turn off the semiconductor switch according to the short circuit protecting signal. A delay duration is present between the modulating signal and the control signal, and the semiconductor switch is turned on during the delay duration.Type: ApplicationFiled: June 1, 2015Publication date: December 31, 2015Inventors: Qing-Long ZHONG, Yan LI, Hong-Jian GAN