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  Full-resonant power circuit device for receiving a variable input voltageUSPTO Application #: 20070236967Title: Full-resonant power circuit device for receiving a variable input voltage Abstract: The present invention provides a full-resonant power circuit device for receiving a variable input voltage that a power factor correcting circuit for separating a variable input voltage AC into a plurality of supply voltages, and the input voltage sections are detected to separately switch corresponding switch transistors for suitably adding resonance inductors to the input voltage sections to be used by the full-resonant power circuit device to reduce the large voltage difference of a conventional power factor corrector so as to improve the efficiency of the power circuit device and improve a half-bridge resonance circuit that is only operated in a fixed voltage source. (end of abstract)
Agent: Rosenberg, Klein & Lee - Ellicott City, MD, US Inventors: Chih-Lung Liu, Tsai-Liang Hsu USPTO Applicaton #: 20070236967 - Class: 363021020 (USPTO) The Patent Description & Claims data below is from USPTO Patent Application 20070236967. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] 1. Field of the invention [0002] The present invention relates to a full-resonant power circuit device for receiving a variable input voltage, and more particularly, the full-resonant power circuit device switches to vary a resonance inductor for providing a stable voltage to a load in response to the variable input voltage. [0003] 2. Description of the Prior Art [0004] Reference is made from FIG. 1, which is a schematic view of a half-bridge full-resonant converter of the prior art. In the present day, a structure of a full-resonant converter is based on a half-bridge topology or a full-bridge topology. A switch Q.sub.1 and a switch Q.sub.2 are connected to be a half-bridge structure and are switched by a variable switching frequency controlling method. When a switching frequency between the switch Q.sub.1 and switch Q.sub.2 is higher than a resonance frequency obtained from a resonance capacitor C.sub.r and a resonance inductor L.sub.r, the switch Q.sub.1 and the switch Q.sub.2 are conducted at a zero voltage for reducing the consumption of the switch Q.sub.1 and the switch Q.sub.2 therebetween. Moreover, the half-bridge full-resonant power circuit adjusts the switching frequency between the switch Q.sub.1 and the switch Q.sub.2 or the resonance frequency obtained from the resonance capacitor C.sub.r and the resonance inductor L.sub.r for adjusting a magnitude of an output voltage V.sub.o. [0005] However, no matter the half-bridge or the full-bridge full-resonant converter, for obtaining the stabilization of the output voltage V.sub.o, the value of the resonance inductor L.sub.r should be designed in response to a variational input voltage AC. Hence, the range of the variational input voltage AC can't too large for the half-bridge or the full-bridge full-resonant converter. [0006] Reference is made from FIG. 2, which is schematic view of the half-bridge full-resonant converter with a power factor corrector (PFC) of the prior art. The half-bridge full-resonant converter is often applied to supply a high power, and due to the high power of the full-resonant converter, the power factor of the full-resonant converter is relatively low. Therefore, it is often to use a power factor corrector 2 to improve the power factor so as to conform to the IEC61000-3-2 standards. And the power factor corrector 2 not only improves the power factorbut provides a stable voltage to the full-resonant converter so as to stabilize the output voltage V.sub.o thereof. However, the power factor corrector 2 boosts variational input voltage AC into a supply voltage V.sub.in for being used by the full-resonant converter, the power factor corrector 2 will produce a high current in the conversion condition to increase the consumption of a switch transistor Q.sub.PFC of the power factor corrector 2 so as to reduce the efficiency of the power circuit device. [0007] The inventor of the present invention recognizes the above shortage should be corrected and special effort has been paid to research this field. The present invention is presented with reasonable design and good effect to resolve the above problems. SUMMARY OF THE INVENTION [0008] The present invention provides a full-resonant power circuit device for receiving a variable input voltage, wherein a power factor correcting circuit separates the variable input voltage into a plurality of power voltages. The full-resonant power circuit device controls the switch transistors for switching so as to feed proper resonance inductors by detecting the variable input voltage and improve the efficiency of the power circuit device. [0009] In a first embodiment of the present invention, a power factor corrector for receiving a variable input voltage and boosting the variable input voltage to be a supply voltage, and a square wave generator for producing a series of square wave voltages in response to the supply voltages. Moreover, the present invention has a primary resonance loop coupled with the square wave generator, includes a serial capacitor, a first serial inductor, and a second serial inductor that are mutually serially connected, and a first switch is coupled with the primary resonance loop. And at least one secondary resonance loop is coupled with the square wave generator, have the serial capacitor is coupled with the first serial inductor and the first serial inductor is coupled with at least one auxiliary serial inductor, and at least one second switch is separately coupled with the secondary resonance loops. And a rectifier circuit coupled with the primary resonance loop for outputting a direct current (DC) voltage in response to the series of square wave, and a voltage detector for detecting the variable input voltage, and separately controlling the first switch to conduct a function of the primary resonance loop and the second switch to conduct a function of the secondary resonance loop in response to a magnitude of the variable input voltage. [0010] In a second embodiment of the present invention, a power factor corrector for receiving a variable input voltage and boosting the variable input voltage to be a supply voltage, and a square wave generator for producing a series of square wave voltages in response to the supply voltages. Moreover, the present invention has a primary resonance loop coupled with the square wave generator, includes a serial capacitor, a first serial inductor, and a second serial inductor that are mutually serially connected, and a first switch is coupled with the primary resonance loop. And at least one secondary resonance loop is coupled with the square wave generator, have the first serial inductor is coupled with at least one auxiliary serial capacitor, and at least one second switch is separately coupled with the secondary resonance loops. And a rectifier circuit coupled with the primary resonance loop for outputting a direct current (DC) voltage in response to the series of square wave, and a voltage detector for detecting the variable input voltage, and separately controlling the first switch to conduct a function of the primary resonance loop and the second switch to conduct a function of the secondary resonance loop in response to a magnitude of the variable input voltage. [0011] It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the invention as claimed. Other advantages and features of the invention will be apparent from the following description, drawings and claims. BRIEF DESCRIPTION OF THE DRAWINGS [0012] The above and further advantages of this invention may be better understood by referring to the following description, taken in conjunction with the accompanying drawings, in which: [0013] FIG. 1 is a schematic view of a half-bridge full-resonant converter of the prior art; [0014] FIG. 2 is schematic view of the half-bridge full-resonant converter with a power factor corrector (PFC) of the prior art; [0015] FIG. 3 is a schematic view of a first embodiment of a full-resonant power circuit device for receiving a variable input voltage of the present invention; and [0016] FIG. 4 is a schematic view of a second embodiment of the full-resonant power circuit device for receiving a variable input voltage of the present invention. [0017] The drawings will be described further in connection with the following detailed description of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0018] Reference is made from FIG. 3, which is a schematic view of a first embodiment of a full-resonant power circuit device for receiving a variable input voltage of the present invention. The half-bridge full-resonant power circuit device 1 includes a power factor corrector 14 receives the variable input voltage AC and boosting the variable input voltage AC to be a supply voltage V.sub.in, and a square wave generator 10 is coupled with the power factor corrector 14 for producing a series of square wave voltages (not shown) in response to the supply voltages V.sub.in and the square wave generator 10 has switches Q.sub.1, Q.sub.2 connected to be a half-bridge structure or four switches (not shown) connected to be a full-bridge structure. A primary resonance loop is coupled with the square wave generator 10, has a serial capacitor C.sub.r is coupled with a first serial inductor L.sub.r1 and the first serial inductor L.sub.r1 is coupled with a second serial inductor L.sub.r2, and a first switch S.sub.1 is coupled with the primary resonance loop and a ground reference G. A secondary resonance loop is coupled with the square wave generator 10, has the serial capacitor C.sub.r is coupled with the first serial inductor L.sub.r1 and the first serial inductor L.sub.r1 is coupled with an auxiliary serial inductor L.sub.c, and a second switch S.sub.2 is separately coupled with the secondary resonance loop and the ground reference G. [0019] The half-bridge full-resonant power circuit device 1 further comprises a transformer T, a primary side of the transformer T has the first serial inductor L.sub.r1 and the second serial inductor L.sub.r2 and a secondary side of the transformer T is coupled with a rectifier circuit 16, and the transformer T receiving the series of square wave voltages for providing a direct current (DC) voltage V.sub.o to a load circuit R.sub.o and the rectifier circuit 16 is a center tap rectifier circuit. A voltage detector 12 for detecting the variable input voltage AC or the supply voltages V.sub.in, and separately controlling the first switch S.sub.1 to conduct a function of the primary resonance loop and the second switch S.sub.2 to conduct a function of the secondary resonance loop according to a magnitude of the variable input voltage AC or the supply voltages V.sub.in. [0020] The power factor corrector 14 is used to divide the variable input voltage AC into an AC low voltage (90-132 volts) and an AC high voltage (180-264 volts) so as to make the voltages conform to specifications of a global common variable input voltage AC. In AC low voltage, the power factor corrector 14 detects the AC low voltage and boosts it to a 240-volt supply voltage; in AC high voltage, the power factor corrector 14 detects the AC high voltage and boosts it to 400-volt supply voltage. Hence, a voltage difference between an input end (90-132 volts or 180-264 volts) of the power factor corrector 14 and an output end (240 volts or 400 volts) of the power factor corrector 14 is smaller than a voltage difference of the conventional power factor corrector, a current is relatively smaller, and losses of a switch transistor Q.sub.PFC of the power factor corrector 14 are smaller so as to improve the efficiency of the power circuit device. Moreover, the power factor corrector 14 is also used to divide the variable input voltage AC into a plurality of sections so as to output different kinds of the supply voltages V.sub.in. Continue reading... Full patent description for Full-resonant power circuit device for receiving a variable input voltage Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Full-resonant power circuit device for receiving a variable input voltage patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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