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| Quaternary alloy |
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| Regenerator temperature control |
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Current-mode control device and switching power supply employing same
| Details |
Inventors: Takahashi, Seiichi; Ohashi, Yasuo; Nishi, Koji;
Assignee: Murata Manufacturing Co., Ltd. (JP)
Primary Examiner: Wong; Peter S.
Assistant Examiner: Han; Y. J.
Attorney, Agent or Firm: Ostrolenk, Faber, Gerb & Soffen, LLP
A current-mode control device for controlling an output voltage of a DC power supply including: a switching element for supplying an output voltage of the DC power supply through an on/off switching action; an output voltage detector circuit for detecting the output voltage of the DC power supply and outputting an output voltage based on the output voltage of the DC power supply; a current sense circuit for converting into a voltage a switching current flowing through the switching element during the switch-on period of the switching element to sense and output the resulting voltage; an integrating circuit for converting the switching current of the switching circuit that increases at a gradient of a straight line linear function with time during of the switch-on period of the switching element into a voltage that increases at a rate defined by a quadratic or higher-order curved line with time by integrating the switching current of the switching circuit at least once and for superimposing the resulting voltage on the output voltage of the current sense circuit; and a switching control circuit for controlling the on/off switching action of the switching element in response to the output voltage of the output voltage detector circuit and the output voltage of the current sense circuit on which the output voltage of the integrating circuit is superimposed such that the output voltage of the DC power supply is stabilized. |
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DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION Hereinafter, the preferred embodiments of the present invention are explained in detail with reference to the drawings.
FIG.
1 shows a switching power supply having a current-mode control device with a slope compensation circuit according to a first embodiment of the present invention.
This embodiment is different from the related art shown in FIG.
5 in that rather than arranging a slope compensation circuit 18 between the output side of a current sense circuit 16 and the output side of a switching control circuit 10, a slope compensation circuit is arranged in the current sense circuit 16 so that the voltage V.
sub.
s/ having a quadratic curved line represented by a full line in FIG.
2C is fed from the current sense circuit 16 to the switching control circuit 10.
In FIG.
1, components identical to those described with reference to FIG.
5 are designated with the same reference numerals and the explanation about them is omitted.
In this embodiment, as shown in FIG.
1, one terminal of capacitor C.
sub.
s/ is connected to one terminal (ground end) of a resistor 8 of the current sense circuit 16, the other terminal of the capacitor C.
sub.
s/ is grounded, a resistor 23 is connected in parallel with the capacitor C.
sub.
s/, an integrating circuit 24 is made of the resistor 8 and the capacitor C.
sub.
s/, the resistor 23 constitutes a discharging circuit 40 for discharging a voltage at the capacitor C.
sub.
s/, and the slope compensation circuit 41 comprises the integrating circuit 24 and the discharging circuit 40.
The first embodiment is thus constructed, and the circuit operation of the slope compensation circuit in this embodiment is now briefly discussed.
When an on signal is issued from the switching control circuit 10, transistor 13 is turned on and switching element 2 is switched on, and during the switch-on period of the switching element 2, a current I.
sub.
sw increases at a gradient of a linear straight line with time as shown in FIG.
2A.
The switching current I
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Fuel Cells 
