Patents Assigned to Cosel Co., Ltd.
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Patent number: 11176800Abstract: A power supply device is such that when an output voltage is abnormal, a system manager or the like can easily acquire information effective in identifying a cause of the abnormality. The power supply device includes a first light emitting element installed to be visually recognizable from an exterior, and a light emitting element control unit that drives the first light emitting element. When an output voltage is abnormal, the light emitting element control unit causes the first light emitting element to flash, thereby convert at least one of specific power supply operation information used for inferring a cause of the output voltage being abnormal and cause information inferred based on the specific power supply operation information into an optical digital signal formatted for serial communication, and causes the optical digital signal to be output from the first light emitting element.Type: GrantFiled: November 20, 2020Date of Patent: November 16, 2021Assignee: COSEL CO., LTD.Inventors: Nobuto Kawataka, Yuji Hirose, Shinji Moriya, Masanobu Hiramatsu, Hikaru Kobayashi, Yuta Usui
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Patent number: 10116223Abstract: A switching power supply apparatus is configured of, as a primary-side circuit, a synchronous rectification step-up/down chopper circuit including a main switching element (14), a commutation element (16), a choke coil (18), and a buffer capacitor (20). As a secondary-side circuit, to a secondary winding provided to the choke coil, a series circuit including a rectifying element and an output capacitor is connected. An inductance of the choke coil is set to have a predetermined value so that a choke coil current IL flowing through the choke coil flows in both of a positive direction and a negative direction across zero in one cycle of switching when an output current is equal to or smaller than a maximum output current. A switching control circuit performs control of complementarily turning the main switching element and the commutation element ON/OFF in a switching cycle by providing a deadtime, thereby performing soft switching.Type: GrantFiled: February 10, 2017Date of Patent: October 30, 2018Assignee: COSEL CO., LTD.Inventor: Kazuhiro Horii
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Patent number: 9240719Abstract: A control circuit (24) includes a calculation means (28) which determines ON time and OFF time of a main switching element (14) and a drive pulse generating means (30) which generates drive pulses that turn the main switching element (14) ON and OFF. A control function formula which prescribes a relationship between an output voltage (Vo) and an output differential value (Vd) by a negative linear function and the like is defined in the calculation means (28). The calculation means (28) samples an input voltage signal (Vi) and an output voltage signal (Vo) at a timing synchronized with a switching cycle of the main switching element (14), and calculates the ON time and OFF time of the main switching element (14) thereafter so as to satisfy the control function formula. The drive pulse generating means (30) generates drive pulses (V14) which turn the main switching element (14) ON and OFF on the basis of the ON and OFF time determined by the calculation means (28).Type: GrantFiled: July 25, 2012Date of Patent: January 19, 2016Assignee: COSEL CO. LTD.Inventors: Takeshi Usuda, Yoshiki Matsuo
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Publication number: 20140159694Abstract: A control circuit (24) includes a calculation means (28) which determines ON time and OFF time of a main switching element (14) and a drive pulse generating means (30) which generates drive pulses that turn the main switching element (14) ON and OFF. A control function formula which prescribes a relationship between an output voltage (Vo) and an output differential value (Vd) by a negative linear function and the like is defined in the calculation means (28). The calculation means (28) samples an input voltage signal (Vi) and an output voltage signal (Vo) at a timing synchronized with a switching cycle of the main switching element (14), and calculates the ON time and OFF time of the main switching element (14) thereafter so as to satisfy the control function formula. The drive pulse generating means (30) generates drive pulses (V14) which turn the main switching element (14) ON and OFF on the basis of the ON and OFF time determined by the calculation means (28).Type: ApplicationFiled: July 25, 2012Publication date: June 12, 2014Applicant: COSEL CO. LTD.Inventors: Takeshi Usuda, Yoshiki Matsuo
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Patent number: 8400120Abstract: A control function formula which provides a relationship between an output voltage signal Vo and an output differential value with, for example, a negative linear function is defined in a calculation means. The calculation means samples an input voltage signal, an output voltage signal and an output differential signal at time instants in synchronization with a cycle of switching of a main switching element, and calculates subsequent ON and OFF durations of the main switching elements such that the control function formula might be satisfied. A drive pulse generation means generates a drive pulse with which the main switching element is turned on and off based on the ON and OFF durations determined by the calculation means. The output differential signal is generated by, for example, a capacitor current detection means or an observer device which detect a current of a smoothing capacitor.Type: GrantFiled: October 25, 2010Date of Patent: March 19, 2013Assignee: Cosel Co., Ltd.Inventors: Takeshi Usuda, Yoshiki Matsuo, Takeshi Takayanagi, Yasuhiro Masuya
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Patent number: 8320145Abstract: A switching power source device includes current control pulse generating means configured of a target value setting module, which outputs a changeable value which is a predetermined target value relating to a control of an output current, a computing module, which carries out a computing process relating to the control of the output current based on the target value, and outputs a computation result, and a pulse generating module, which generates a current control pulse voltage for controlling the output current based on the computation result. The switching power source device includes a current detecting circuit, which detects the output current or a current flowing in a switching element TR1, and a current limit signal generating circuit which, when the detected current exceeds a reference value set based on the output of the current control pulse generating means, outputs a current limit signal for limiting the current.Type: GrantFiled: November 26, 2008Date of Patent: November 27, 2012Assignee: Cosel Co., Ltd.Inventor: Kazuhiro Horii
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Patent number: 8278896Abstract: A switching power supply device has a synchronized rectifying element that turns on and off complementarily with a main oscillation element that is connected in series with an input power supply, and a parasitic diode that is connected to the two ends of the synchronized rectifying element in a direction enabling current supply toward a smoothing circuit. The device has a control circuit that generates a control pulse according to which a time delay is set for turning on the main oscillation element after a certain period of time elapses after the synchronized rectifying element is turned off, and that drives the main oscillation element and the synchronized rectifying element. An auxiliary rectification circuit has a series circuit formed by an auxiliary switch element and an auxiliary capacitor driven by the control circuit (PW2) and which is provided between the two ends of the parasitic diode.Type: GrantFiled: May 1, 2009Date of Patent: October 2, 2012Assignee: Cosel Co., Ltd.Inventor: Kazuhiro Horii
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Publication number: 20110096571Abstract: A control function formula which provides a relationship between an output voltage signal Vo and an output differential value with, for example, a negative linear function is defined in a calculation means. The calculation means samples an input voltage signal, an output voltage signal and an output differential signal at time instants in synchronization with a cycle of switching of a main switching element, and calculates subsequent ON and OFF durations of the main switching elements such that the control function formula might be satisfied. A drive pulse generation means generates a drive pulse with which the main switching element is turned on and off based on the ON and OFF durations determined by the calculation means. The output differential signal is generated by, for example, a capacitor current detection means or an observer device which detect a current of a smoothing capacitor.Type: ApplicationFiled: October 25, 2010Publication date: April 28, 2011Applicant: Cosel Co., Ltd.Inventors: Takeshi USUDA, Yoshiki Matsuo, Takeshi Takayanagi, Yasuhiro Masuya
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Patent number: 7208926Abstract: A switching signal modulation circuit includes a switching control circuit having an ON time control terminal and an OFF time control terminal, the switching control circuit capable of adjusting respectively separately ON time and OFF time of a switching signal using values of resistors externally attached respectively to the ON time control terminal and the OFF time control terminal; a spread signal generating circuit operable to output a spread signal; an ON time setting resistor connected between the ground and the ON time control terminal of the switching control circuit; an OFF time setting resistor connected between the ground and the OFF time control terminal of the switching control circuit; a first weight resistor operable to vary the frequency and the duty of the switching signal, the first weight resistor connected between an output of the spread signal generating circuit and the ON time control terminal of the switching control circuit; and a second weight resistor operable to vary the frequency aType: GrantFiled: November 17, 2004Date of Patent: April 24, 2007Assignee: Cosel Co., Ltd.Inventor: Nakada Mitsuo
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Patent number: 7116562Abstract: A fly-back type synchronous rectifying switching power supply device in which a rectifying element is turned off before the main switch is turned on even when the on-time of a main switch element is lengthened due to sudden variation of a load. The synchronous rectifying switching power supply device is equipped with a synchronous rectifying element connected to a secondary winding of a transformer in series and driving means including an auxiliary winding for turning on the synchronous rectifying element complementarily with a main switch element between output terminals. A transistor serving as interrupting means for turning off the synchronous rectifying element is provided between the gate and source of the synchronous rectifying element.Type: GrantFiled: November 18, 2003Date of Patent: October 3, 2006Assignee: Cosel Co., Ltd.Inventors: Makoto Takashima, Yoshimichi Hirokawa
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Patent number: D442913Type: GrantFiled: March 17, 2000Date of Patent: May 29, 2001Assignee: Cosel Co., Ltd.Inventors: Kuniaki Nagahara, Tatsuya Mano, Katsuhiro Koizumi, Toshihisa Miura
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Patent number: D442914Type: GrantFiled: March 17, 2000Date of Patent: May 29, 2001Assignee: Cosel Co., Ltd.Inventors: Kuniaki Nagahara, Tatsuya Mano, Katsuhiro Koizumi, Toshihisa Miura
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Patent number: D478309Type: GrantFiled: March 17, 2000Date of Patent: August 12, 2003Assignee: Cosel Co., Ltd.Inventors: Kuniaki Nagahara, Tatsuya Mano, Katsuhiro Koizumi, Toshihisa Miura
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Patent number: D427968Type: GrantFiled: May 21, 1999Date of Patent: July 11, 2000Assignee: Cosel Co., Ltd.Inventors: Kuniaki Nagahara, Toshio Watanabe, Masaharu Maesaka
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Patent number: D428388Type: GrantFiled: May 21, 1999Date of Patent: July 18, 2000Assignee: Cosel Co., Ltd.Inventors: Kuniaki Nagahara, Toshio Watanabe, Masaharu Maesaka
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Patent number: D428851Type: GrantFiled: May 21, 1999Date of Patent: August 1, 2000Assignee: Cosel Co., Ltd.Inventors: Kuniaki Nagahara, Toshio Watanabe, Masaharu Maesaka
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Patent number: D429214Type: GrantFiled: May 21, 1999Date of Patent: August 8, 2000Assignee: Cosel Co., Ltd.Inventors: Kuniaki Nagahara, Toshio Watanabe, Masaharu Maesaka
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Patent number: D429215Type: GrantFiled: July 19, 1999Date of Patent: August 8, 2000Assignee: Cosel Co., Ltd.Inventors: Tetsuo Sugimoria, Takahiro Yoneda, Mitsuo Nakada, Yuichi Uozu, Yuji Hirose
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Patent number: D432080Type: GrantFiled: July 19, 1999Date of Patent: October 17, 2000Assignee: Cosel Co., Ltd.Inventors: Tetsuo Sugimoria, Takahiro Yoneda, Mitsuo Nakada, Yuichi Uozu, Yuji Hirose