Patents Assigned to Astec International Limited
  • Patent number: 11075032
    Abstract: A power transformer includes at least two first windings, at least two second windings interleaved with the at least two first windings, and a magnetic core. The at least two first windings and the at least two second windings are positioned adjacent the magnetic core. Each first winding includes a wire and a plurality of turns. One or more windings of the at least two first windings include a bonding material and at least two adjacent turns of said plurality of turns adhered to each other via the bonding material. Other example power transformers, methods of manufacturing power transformers, and methods of manufacturing windings are also disclosed.
    Type: Grant
    Filed: August 31, 2018
    Date of Patent: July 27, 2021
    Assignee: Astec International Limited
    Inventors: Wo Oi Cheng, Alfredo Belmonte Grueso, Chi Wai Kevin Wong
  • Publication number: 20210210980
    Abstract: A switched mode power supply comprises a communication interface including an address terminal configured to couple to an external resistor for setting a communication address of the switched mode power supply. A control circuit is configured to determine the value of the external resistor a first time with a first technique and set the communication address of the switched mode power supply based on the value of the external resistor determined using the first technique if the value of the external resistor is greater than the threshold value. The control circuit is also configured to, if the value of the external resistor is less than the threshold value, determine the value of the external resistor a second time with a second technique and set the communication address of the switched mode power supply based on the value of the external resistor determined using the second technique.
    Type: Application
    Filed: March 4, 2021
    Publication date: July 8, 2021
    Applicant: Astec International Limited
    Inventors: Bing Zhang, Mei Qin, Lian Liang, Wenyong Liu, Zhishuo Li
  • Publication number: 20210203240
    Abstract: A switched-mode power supply includes an input, an output, and a transformer including primary and secondary windings. The power supply also includes a synchronous rectifier coupled to selectively conduct current through the secondary winding of the transformer. The synchronous rectifier includes a source, a gate and a drain terminal. The power supply further includes a controller having a supply voltage terminal and a gate terminal to supply a control signal to the gate of the synchronous rectifier, and a circuit coupled between the supply voltage terminal of the controller and at least one of the gate terminal of the controller and the drain terminal of the synchronous rectifier to supply power from the gate terminal of the controller or the drain terminal of the synchronous rectifier to the supply voltage terminal of the controller. Methods of supplying power in switched-mode power supplies are also disclosed.
    Type: Application
    Filed: March 10, 2021
    Publication date: July 1, 2021
    Applicant: Astec International Limited
    Inventors: Yongtao Xie, Pengfei Cai, Shaobo Li, Zhanwu Wang
  • Publication number: 20210143814
    Abstract: Example MOSFET circuits include a first metal-oxide-semiconductor field-effect transistor (MOSFET) having a gate, a source and a drain, and a second MOSFET coupled in series with the first MOSFET. The second MOSFET has a gate, a source and a drain. The MOSFET circuit also includes a controller configured to supply a same control signal to the gate of the first MOSFET and the gate of the second MOSFET to turn on or turn off the first MOSFET and the second MOSFET when a drain-source voltage of the first MOSFET and a drain-source voltage of the second MOSFET are substantially zero. Other MOSFET circuits and methods of operating MOSFET circuits are also disclosed.
    Type: Application
    Filed: January 19, 2021
    Publication date: May 13, 2021
    Applicant: Astec International Limited
    Inventors: Yong Tao XIE, Enesto Zaparita CAGUIOA, Jr.
  • Patent number: 10985666
    Abstract: A switched-mode power supply includes an input, an output, and a transformer including primary and secondary windings. The power supply also includes a synchronous rectifier coupled to selectively conduct current through the secondary winding of the transformer. The synchronous rectifier includes a source, a gate and a drain terminal. The power supply further includes a controller having a supply voltage terminal and a gate terminal to supply a control signal to the gate of the synchronous rectifier, and a circuit coupled between the supply voltage terminal of the controller and at least one of the gate terminal of the controller and the drain terminal of the synchronous rectifier to supply power from the gate terminal of the controller or the drain terminal of the synchronous rectifier to the supply voltage terminal of the controller. Methods of supplying power in switched-mode power supplies are also disclosed.
    Type: Grant
    Filed: July 31, 2018
    Date of Patent: April 20, 2021
    Assignee: Astec International Limited
    Inventors: Yongtao Xie, Pengfei Cai, Shaobo Li, Zhanwu Wang
  • Publication number: 20210111583
    Abstract: An electric power supply comprises first and second input circuits for receiving first and second input DC voltages and a control circuit coupled to the first and second input circuits. The control circuit is configured to sense the first input DC voltage and the second input DC voltage and to enable the first input circuit and disable the second input circuit in response to the first input circuit having the highest input DC voltage to substantially prevent current from back feeding to the first input circuit from the second input circuit. The control circuit is also configured to enable the second input circuit and disable the first input circuit in response to the second input circuit having the highest input DC voltage to substantially prevent current from back feeding to the second input circuit from the first input circuit.
    Type: Application
    Filed: December 11, 2020
    Publication date: April 15, 2021
    Applicant: Astec International Limited
    Inventors: Rochie Ligaya Sedillo Libby, Neil Maderas Reyes, Khanderao Madhav Gaikwad
  • Patent number: 10978241
    Abstract: According to some aspects of the present disclosure, transformers having a screen layer and corresponding methods of winding transformers and are disclosed. Example transformers include at least one transformer core, at least one primary winding layer wound about the transformer core, and at least one secondary winding layer wound about the transformer core. The secondary winding layer includes a secondary winding wire having a width and a number of turns per layer. The transformer also includes at least one screen layer wound about the transformer core and disposed between the primary winding layer and the secondary winding layer. The screen layer includes a screen wire having substantially the same width as the secondary winding wire and substantially the same number of turns per layer as the secondary winding wire, to reduce common mode noise in the secondary winding layer.
    Type: Grant
    Filed: December 5, 2017
    Date of Patent: April 13, 2021
    Assignee: Astec International Limited
    Inventors: Rex William James Whittle, Chi Wai Kevin Wong
  • Publication number: 20210091673
    Abstract: A power supply comprises a transformer having a primary winding and a secondary winding, a bridge circuit coupled to the primary winding of the transformer, a first rail coupled to the secondary winding of the transformer, and a second rail coupled to the secondary winding of the transformer. The bridge circuit comprises a plurality of switches. The power supply also comprises a first sensor assembly coupled to generate a first error signal representing a difference between currents in the first rail and the second rail. A controller is configured to alter a duty cycle of a first switch of the plurality of switches relative to a duty cycle of a second switch of the plurality of switches based on the first error signal.
    Type: Application
    Filed: December 10, 2020
    Publication date: March 25, 2021
    Applicant: Astec International Limited
    Inventors: Yongtao Xie, Zhanwu Wang, Sudhakarababu Chakkirala
  • Patent number: 10958100
    Abstract: A switched mode power supply includes a communication interface and an address terminal for setting a communication address for the power supply using the resistance of an external resistor when the external resistor is coupled to the address terminal. The power supply is configured to determine a first resistance value for the external resistor using a first technique, determine a second resistance value for the external resistor using a second technique, set the communication address of the power supply using the first resistance value if the first resistance value is greater than a threshold value, and set the communication address of the power supply using the second resistance value if the first resistance value is less than the threshold value. Other example switched mode power supplies, power systems including one or more power supplies, and methods for setting a communication address of a power supply are also disclosed.
    Type: Grant
    Filed: December 3, 2018
    Date of Patent: March 23, 2021
    Assignee: Astec International Limited
    Inventors: Bing Zhang, Mei Qin, Lian Liang, Wenyong Liu, Zhishuo Li
  • Publication number: 20210072294
    Abstract: According to some aspects of the present disclosure, power modules having current sensing circuits, and corresponding sensing methods, are disclosed. Example power modules include a printed circuit board (PCB) having a PCB trace, a first sense terminal coupled to the PCB trace at a first location, and a second sense terminal coupled to the PCB trace at a second location such that a resistance between the first and second sense terminals is defined by a resistance of the PCB trace between the first location and the second location. The power module further comprises a control coupled to the first sense terminal and the second sense terminal, the control adapted to measure a voltage between the first sense terminal and the second sense terminal and determine a current through the PCB trace based on the measured voltage and the resistance between the first sense terminal and the second sense terminal.
    Type: Application
    Filed: November 19, 2020
    Publication date: March 11, 2021
    Applicant: Astec International Limited
    Inventors: Mao Xi Xiang, Jian Feng LV, Chen Chen Zheng, Qian Feng
  • Patent number: 10931100
    Abstract: A current limiting circuit for controlling current from a power supply to a load having a capacitance includes an inductor, a transistor coupled in a current path with the inductor, and a control circuit. The transistor includes a control terminal. The control circuit is coupled to sense a voltage across the inductor and coupled to the control terminal of the transistor. The control circuit is configured to turn off the transistor when the voltage across the inductor is greater than a threshold to restrict current from a power supply, and turn on the transistor when a defined parameter is met to allow current from the power supply to charge the load capacitance. Other example current limiting circuits are also disclosed.
    Type: Grant
    Filed: December 26, 2017
    Date of Patent: February 23, 2021
    Assignee: Astec International Limited
    Inventors: Wei Ping Li, Wei Jia Yan, Wen Jian Liao, Xin Zhang
  • Patent number: 10931116
    Abstract: Example electrical power systems include an output for supplying a DC output voltage to a load, a first power source connected with the output to supply DC power to the load, and a second power source connected with the output to supply DC power to the load. The electrical power system is configured to supply DC power to the load using only the first power source when a demand of the load is less than an output capacity of the first power source, and the second power source is configured to maintain an enabled on-state when only the first power source is supplying DC power to the load. Additional electrical power systems and methods are also disclosed.
    Type: Grant
    Filed: November 30, 2018
    Date of Patent: February 23, 2021
    Assignee: Astec International Limited
    Inventors: John Faustino Boqueo Begino, III, Nathaniel Franco Neri
  • Publication number: 20210044200
    Abstract: A multiphase interleaved forward power converter includes an inductor and first and second subconverter comprising respective transformers. The converter also includes first and second drives configured to respectively operate the first and second subconverters with cycling periods comprising a conduction period, a reset period, and an idle period. The first and second drives are also configured to phase shift the cycling periods in each subconverter such that the conduction period of the subconverter is at least partially complementary to the idle period of the other subconverter. The second drive also clamps a voltage across a winding of the transformer of the first subconverter to substantially prevent a first resonance voltage from propagating in the first subconverter during the idle period of the first subconverter.
    Type: Application
    Filed: October 13, 2020
    Publication date: February 11, 2021
    Applicant: Astec International Limited
    Inventors: John Faustino Boqueo Begino, III, Nathaniel Franco Neri
  • Patent number: 10917089
    Abstract: Example MOSFET circuits include a first metal-oxide-semiconductor field-effect transistor (MOSFET) having a gate, a source and a drain, and a second MOSFET coupled in series with the first MOSFET. The second MOSFET has a gate, a source and a drain. The MOSFET circuit also includes a controller configured to supply a same control signal to the gate of the first MOSFET and the gate of the second MOSFET to turn on or turn off the first MOSFET and the second MOSFET when a drain-source voltage of the first MOSFET and a drain-source voltage of the second MOSFET are substantially zero. Other MOSFET circuits and methods of operating MOSFET circuits are also disclosed.
    Type: Grant
    Filed: April 9, 2018
    Date of Patent: February 9, 2021
    Assignee: Astec International Limited
    Inventors: Yong Tao Xie, Ernesto Jr. Zaparita Caguioa
  • Patent number: 10917003
    Abstract: A control circuit for a switching power converter includes a current compensator. The current compensator is configured to receive a first current reference signal, a second current reference signal and a signal representing an input current of the switching power converter, generate a first current error signal based on the signal representing the input current and the first current reference signal for controlling at least one power switch of the power converter, generate a second current error signal based on the signal representing the input current and the second current reference signal, and adjust the first current error signal based on the second current error signal to limit the amount of current flowing through the switching power converter. Other example control circuits, switching power converters including control circuits and methods for limiting current in switching power converters are also disclosed.
    Type: Grant
    Filed: May 29, 2019
    Date of Patent: February 9, 2021
    Assignee: Astec International Limited
    Inventor: Yancy Fontanilla Boncato
  • Patent number: 10892085
    Abstract: According to some aspects of the present disclosure, circuit board assemblies and methods of circuit board assembly are disclosed. Example circuit board assemblies include a circuit board and a magnetic component coupled to the circuit board. The magnetic component includes a primary winding and a secondary winding. The assembly also includes a winding interconnect terminal electrically coupled to the magnetic component. The winding interconnect terminal is disposed on the circuit board remote from the magnetic component, and the circuit board defines an air gap between the winding interconnect terminal and the magnetic component to provide electrical isolation between the winding interconnect terminal and the magnetic component. Corresponding methods of assembling circuit boards and magnetic components are also disclosed.
    Type: Grant
    Filed: December 5, 2017
    Date of Patent: January 12, 2021
    Assignee: Astec International Limited
    Inventor: Kwong Kei Chin
  • Publication number: 20210007221
    Abstract: A power supply comprises a main circuit board and a multilayer power transmission board electrically coupled to the main circuit board. The multilayer board includes a conductive neutral layer having an inner side, a conductive line layer having an inner side facing the inner side of the conductive neutral layer, and a dielectric medium positioned between the conductive neutral layer and the conductive line layer. The power supply also comprises a first conductive outer layer positioned adjacently to an outer side of the conductive neutral layer, a second conductive outer layer positioned adjacently to an outer side of the conductive line layer, and a conductive plating material positioned within a slot formed in the multilayer power transmission board and covering an interior portion of the multilayer power transmission board facing the slot. The conductive plating material electrically couples the first and second conductive outer layers.
    Type: Application
    Filed: September 24, 2020
    Publication date: January 7, 2021
    Applicant: Astec International Limited
    Inventors: Prabou Ranganathan, Norman Oliva
  • Patent number: 10886855
    Abstract: According to some aspects of the present disclosure, resonant converter power supplies and control methods for reducing unbalanced currents in resonant power supplies are disclosed. Example resonant converter power supplies include an input, an output, a transformer, and a bridge circuit coupled between the input and a primary winding of the transformer. The power supply also includes first and second rectifier rails each coupled between a secondary winding of the transformer and the output, and at least one sensor coupled to generate an error signal representing unbalanced currents in the first and second rectifier ails. The power supply further includes a controller configured to receive the error signal, and adjust a duty cycle of at least one of a first switch and a second switch of the bridge circuit based on the error signal to reduce the unbalanced currents in the first and second rectifier rails.
    Type: Grant
    Filed: December 12, 2017
    Date of Patent: January 5, 2021
    Assignee: Astec International Limited
    Inventors: Yongtao Xie, Zhanwu Wang, Sudhakarababu Chakkirala
  • Patent number: 10886777
    Abstract: A back-feed protection circuit includes input circuits and a control circuit. Each input circuit includes an input for receiving an input DC voltage. The control circuit is configured to enable one of the first input circuit and the second input circuit having the highest input DC voltage, and disable the other input circuit to substantially prevent current from back feeding to the first input circuit and/or the second input circuit. Each input circuit additionally and/or alternatively includes a positive rail, a reference rail and a plurality of switching devices. A set of the switching devices are coupled in series in the positive rail of each input circuit, and another set of the switching devices are coupled in series in the reference rail of each input circuit. Other example back-feed protection circuits, and electric power supplies including back-feed protection circuits are also disclosed.
    Type: Grant
    Filed: October 14, 2019
    Date of Patent: January 5, 2021
    Assignee: Astec International Limited
    Inventors: Rochie Ligaya Sedillo Libby, Neil Maderas Reyes, Khanderao Madhav Gaikwad
  • Patent number: 10877079
    Abstract: According to some aspects of the present disclosure, power modules having current sensing circuits, and corresponding sensing methods, are disclosed. Example power modules include a printed circuit board (PCB) having a PCB trace, an output choke inductor, and an output pin. The power module also includes a first sense terminal coupled to the PCB trace, a second sense terminal coupled to the output pin such that a resistance between the first sense terminal and the second sense terminal is defined by a resistance of the PCB trace and a resistance of the output pin, and a control coupled to the first sense terminal and the second sense terminal. The control is adapted to measure a voltage between the sense terminals, and to determine a current through the PCB trace and the output pin based on the measured voltage and the resistance between the sense terminals.
    Type: Grant
    Filed: July 26, 2016
    Date of Patent: December 29, 2020
    Assignee: Astec International Limited
    Inventors: Mao Xi Xiang, Jian Feng Lv, Chen Chen Zheng, Qian Feng