DC-to-DC converter capable of preventing overvoltage
First Claim
1. A synchronous rectification type DC/DC converter comprising:
- a storage unit storing therein power derived from a power supply;
a first switch element, provided between said power supply and said storage unit, connecting/disconnecting the storage unit to/from the power supply;
a second switch element, provided between the ground and a connecting point of said first switch and said storage unit, connecting/disconnecting said connecting point to/from the ground;
a control unit controlling the connecting/disconnecting operations of said first switch element and said second switch element so as to maintain a voltage outputted from said storage unit at a predetermined value;
an overvoltage detecting unit monitoring an input voltage derived from said power supply and outputting a signal when said input voltage derived from said power supply exceeds a preselected voltage value;
a shortcircuiting unit bringing said first switch element and said second switch element to connecting conditions when the signal from the overvoltage detecting unit is inputted therein, whereby the voltage derived from said power supply is shortcircuited; and
an interrupting unit interrupting input power of said power supply by the power shortcircuited by said shortcircuiting unit.
1 Assignment
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Accused Products
Abstract
To avoid burning out a capacitor in a synchronous rectification type DC-to-DC converter due to overvoltages, the synchronous rectification type DC-to-DC converter includes a storage unit storing therein power derived from a power supply, switching elements connecting and disconnecting respective signal paths from power and ground, and a control unit controlling the connecting/disconnecting operations of the switching elements to maintain a voltage output from the storage unit at a predetermined value. The DC/DC converter also includes an overvoltage detecting unit monitoring a voltage derived from the power supply to thereby output an alarm signal when the voltage derived from the power supply exceeds a preselected voltage value, a shortcircuiting unit influencing the connecting conditions of the switching elements when the alarm signal from the overvoltage detecting unit is input therein, whereby the voltage derived from the power supply is shortcircuited, and an interrupting unit interrupting one of the signal paths by the power shortcircuited by the shortcircuiting unit.
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Citations
52 Claims
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1. A synchronous rectification type DC/DC converter comprising:
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a storage unit storing therein power derived from a power supply; a first switch element, provided between said power supply and said storage unit, connecting/disconnecting the storage unit to/from the power supply; a second switch element, provided between the ground and a connecting point of said first switch and said storage unit, connecting/disconnecting said connecting point to/from the ground; a control unit controlling the connecting/disconnecting operations of said first switch element and said second switch element so as to maintain a voltage outputted from said storage unit at a predetermined value; an overvoltage detecting unit monitoring an input voltage derived from said power supply and outputting a signal when said input voltage derived from said power supply exceeds a preselected voltage value; a shortcircuiting unit bringing said first switch element and said second switch element to connecting conditions when the signal from the overvoltage detecting unit is inputted therein, whereby the voltage derived from said power supply is shortcircuited; and an interrupting unit interrupting input power of said power supply by the power shortcircuited by said shortcircuiting unit. - View Dependent Claims (2, 3)
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4. A DC/DC converter, comprising:
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a storage unit storing power from a power supply; a first switch, provided between said power supply and said storage unit, connecting/disconnecting the storage unit to/from the power supply; a second switch, provided between the ground and said connecting point of said first switch and said storage unit, connecting/disconnecting a connecting point to/from the ground; a control unit controlling said first switch and said second switch so as to maintain a voltage outputted from said storage unit at a predetermined value; a detecting unit detecting whether an input voltage of said power supply exceeds a predetermined voltage value; and a shortcircuiting unit connecting said first switch and said second switch in accordance with said detecting unit, whereby said power supply is shortcircuited. - View Dependent Claims (5, 6, 7, 8)
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9. A synchronous rectification type DC/DC converter comprising:
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a main switch; a synchronous rectification switch; an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit outputting control signals to turn ON both the main switch and the synchronous rectification switch when an overvoltage is detected by the overvoltage detecting unit. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A synchronous rectification type DC/DC converter comprising:
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a main switch; a synchronous rectification switch; an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit turning the main switch and the synchronous rectification switch ON when the overvoltage is detected by the overvoltage detecting unit.
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18. A control circuit for synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch, thereby to effect a synchronous rectification type DC/DC conversion, comprising:
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an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit outputting control signals to turn ON the main switch and the synchronous rectification switch when an overvoltage is detected by the overvoltage detecting unit. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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25. A control circuit for a synchronous rectification type DC/DC converter having a main switch, a synchronous rectification switch, an inductor connected to said main switch and a capacitor connected to said inductor smoothing output of said inductor, thereby to effect a synchronous rectification type DC/DC conversion, comprising:
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an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit outputting control signals to turn ON the main switch and the synchronous rectification switch when an overvoltage is detected by the overvoltage detecting unit.
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26. A control circuit for a synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch, thereby to effect a synchronous rectification type DC/DC conversion, comprising:
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an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit outputting control signals to turn ON the main switch and the synchronous rectification switch when an overvoltage is detected by the overvoltage detecting unit.
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27. A control circuit for a synchronous rectification type DC/DC converter having a main switch, a synchronous switch, an inductor connected to said main switch and a capacitor connected to said inductor smoothing output of said inductor, thereby to effect a synchronous rectification type DC/DC conversion, comprising:
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an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit outputting control signals to turn ON the main switch and the synchronous rectification switch when an overvoltage is detected by the overvoltage detecting unit.
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28. A control circuit for a synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch, comprising:
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a receiving unit receiving a stop signal to stop a DC/DC conversion process when an input voltage exceeds a predetermined threshold; and a control unit outputting control signals to turn ON the main switch and the synchronous rectification switch, when the stop signal is received by the receiving unit. - View Dependent Claims (29, 30, 31, 32, 33)
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34. A control circuit for a synchronous rectification type DC/DC converter having a main switch, a synchronous rectification switch, an inductor connected to said main switch and a capacitor connected to said inductor smoothing output of said inductor, thereby to effect a synchronous rectification type DC/DC conversion, comprising:
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a receiving unit receiving a stop signal to stop a DC/DC conversion process when an input voltage exceeds a predetermined threshold; and a control unit outputting control signals to turn ON the main switch and the synchronous rectification switch, when the stop signal is received by the received unit.
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35. A control circuit for a synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch, comprising:
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a receiving unit receiving a stop signal to stop a DC/DC conversion process when an input voltage exceeds a predetermined threshold; and a control unit turning both the main switch and the synchronous rectification switch ON, when the stop signal is received by the receiving unit.
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36. A control unit for a synchronous rectification type DC/DC converter having a main switch, a synchronous rectification switch, an inductor connected to said main switch and a capacitor connected to said inductor for smoothing output of said inductor, thereby to effect a synchronous rectification type DC/DC conversion, comprising:
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a receiving unit receiving a stop signal to stop a DC/DC conversion process when an input voltage exceeds a predetermined threshold; and a control unit turning both the main switch and the synchronous rectification switch ON, when the stop signal is received by the receiving unit.
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37. A control circuit for controlling a synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch comprising:
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a voltage input terminal inputting therein an input voltage of a DC/DC conversion process; an overvoltage detecting unit outputting a detecting signal when the input voltage inputted into the voltage input terminal exceeds a predetermined value; and a control unit turning ON the main switch and the synchronous rectification switch in response to the detecting signal.
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38. A synchronous rectification type DC/DC converter comprising:
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a storage unit storing therein power derived from a power supply; a first switch element provided between said power supply and said storage unit connecting/disconnecting said storage unit to/from the power supply; a second switch element, provided between ground and a connecting point of said first switch element and said storage unit, connecting/disconnecting said connecting point to/from the ground; a control unit controlling the connecting/disconnecting operations of said first switch element and said second switch element so as to maintain a voltage outputted from said storage unit at a predetermined value; an overvoltage detecting unit monitoring an input voltage derived from said power supply and outputting a signal when said input voltage derived from said power supply exceeds a preselected voltage value; a shortcircuiting unit bringing said second switch element to connecting conditions when the signal from said overvoltage detecting unit is inputted therein, whereby the voltage derived from said power supply is shortcircuited; and an interrupting unit interrupting input power of said power supply by the power shortcircuited by said shortcircuited unit.
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39. A DC/DC converter comprising:
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a storage unit storing power from a power supply; a first switch provided between said power supply and said storage unit, connecting/disconnecting said storage unit to/from the power supply; a second switch provided between ground and said connecting point of said first switch and said storage unit connecting/disconnecting a connecting point to/from the ground; a control unit controlling said first switch and said second switch so as to maintain a voltage outputted from said storage unit at a predetermined value; a detecting unit detecting whether an input voltage of said power supply exceeds a predetermined voltage value; and a shortcircuiting unit bringing said second switch to a connecting condition in accordance with said detecting unit, whereby said power supply is shortcircuited.
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40. A synchronous rectification type DC/DC converter comprising:
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a main switch; a synchronous rectification switch; an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit outputting control signals to turn ON said synchronous rectification switch when an overvoltage is detected by said overvoltage detecting unit.
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41. A synchronous rectification type DC/DC converter comprising;
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a main switch; a synchronous rectification switch; an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit turning said synchronous rectification switch ON when an overvoltage is detected by said overvoltage detecting unit.
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42. A control circuit for a synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch, to effect a synchronous rectification type DC/DC conversion, comprising:
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an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit outputting a control signal to turn ON the synchronous rectification switch when an overvoltage is detected by said overvoltage detecting unit.
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43. A control circuit for synchronous rectification type DC/DC converter having a main switch, a synchronous rectification switch, an inductor connected to said main switch and a capacitor connected to said inductor smoothing output of said inductor, to effect a synchronous rectification type DC/DC conversion, comprising:
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an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit outputting a control signal to turn ON the synchronous rectification switch when an overvoltage is detected by said overvoltage detecting unit.
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44. A control circuit for a synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch, to effect a synchronous rectification type DC/DC conversion, comprising;
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an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit turning the synchronous rectification switch ON when an overvoltage is detected by said overvoltage detecting unit.
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45. A control circuit for a synchronous rectification type DC/DC converter having a main switch, a synchronous rectification switch, an inductor connected to said main switch and a capacitor connected to said inductor smoothing output of said inductor, to effect a synchronous rectification type DC/DC conversion, comprising:
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an overvoltage detecting unit detecting an overvoltage of an input voltage of the synchronous rectification type DC/DC converter; and a control unit turning the synchronous rectification switch ON when an overvoltage is detected by said overvoltage detecting unit.
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46. A control circuit for a synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch, comprising:
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a receiving unit receiving a stop signal to stop a DC/DC conversion process when an input voltage exceeds a predetermined threshold; a control unit outputting control signals to turn ON the synchronous rectification switch when the stop signal is received by said receiving unit.
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47. A control circuit for a synchronous rectification type DC/DC converter having a main switch, a synchronous rectification switch, an inductor connected to said main switch and a capacitor connected to said inductor smoothing output of said inductor, thereby to effect a synchronous rectification type DC/DC conversion, comprising;
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a receiving unit receiving a stop signal to stop a DC/DC conversion process when an input voltage exceeds a predetermined threshold; and a control unit outputting control signals to turn ON the synchronous rectification switch when the stop signal is received by said receiving unit.
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48. A control circuit for a synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch, comprising:
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a receiving unit receiving a stop signal to stop a DC/DC conversion process when an input voltage exceeds a predetermined threshold; and a control unit switching the synchronous rectification switch when the stop signal is received by said receiving unit.
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49. A control circuit for a synchronous rectification type DC/DC converter having a main switch, a synchronous rectification switch, an inductor connected to said main switch and a capacitor connected to said inductor smoothing output of said inductor, to effect a synchronous rectification type DC/DC conversion, comprising;
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a receiving unit receiving a stop signal to stop a DC/DC conversion process when an input voltage exceeds a predetermined threshold; and a control unit turning the synchronous rectification switch ON when the stop signal is received by said receiving unit.
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50. A control circuit for controlling a synchronous rectification type DC/DC converter having a main switch and a synchronous rectification switch, comprising;
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a voltage input terminal inputting therein an input voltage of a DC/DC conversion process; an overvoltage detecting unit outputting a detecting signal when the input voltage inputted into the voltage input terminal exceeds a predetermined value; and a control unit turning ON the synchronous rectification switch when the stop signal is received by said receiving unit.
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51. A control method for a synchronous rectification type DC/DC converter having an input, a main switch and a synchronous rectification switch, comprising:
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outputting a detecting signal when a voltage across the input exceeds a predetermined value; and turning on the main switch and the synchronous rectification switch in response to the detecting signal.
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52. A control method for a synchronous rectification type DC/DC converter having an input and a synchronous rectification switch, comprising:
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detecting an overvoltage across the input of the synchronous rectification type DC/DC converter; and turning on the synchronous rectification switch when an overvoltage is detected.
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Specification