Step-up/down DC-to-DC converter
First Claim
1. In a DC-to-DC (expressed as "DC/DC" below) converter as to which a varying range of an input voltage not stabilized contains a value of an output voltage stabilized, and which requires both operations of step-up and step-down;
- a step-up/down DC/DC converter comprising;
voltage comparison means for comparing the input voltage and the output voltage; and
operation changeover control means for controlling changeover of the operations of the DC/DC converter so that said DC/DC converter may perform the step-down operation as the operation of a step-down type converter when a result of the comparison delivered from said voltage comparison means indicates that said input voltage is higher than said output voltage, and that it may perform the step-up operation as the operation of a step-up type converter when the result of said comparison indicates that said output voltage is higher than said input voltage.
2 Assignments
0 Petitions
Accused Products
Abstract
A converter for converting a DC voltage not stabilized, such as the terminal voltage of a battery, into a stable DC voltage, comprising a voltage comparison unit (2 in FIG. 1) and an operation changeover control unit (3). The voltage comparison unit (2) compares an input voltage and an output voltage. The operation changeover control unit (3) controls the changeover of the operations of the DC/DC converter (1) so that the DC/DC converter (1) may perform a step-down operation as the operation of a step-down type converter when the input voltage is higher than the output voltage as the result of the comparison, and that it may perform a step-up operation as the operation of a step-up type converter when the output voltage is higher than the input voltage. Thus, losses in the smoothing reactor and smoothing capacitor of the step-up/down converter are suppressed to enhance the efficiency thereof.
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Citations
12 Claims
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1. In a DC-to-DC (expressed as "DC/DC" below) converter as to which a varying range of an input voltage not stabilized contains a value of an output voltage stabilized, and which requires both operations of step-up and step-down;
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a step-up/down DC/DC converter comprising; voltage comparison means for comparing the input voltage and the output voltage; and operation changeover control means for controlling changeover of the operations of the DC/DC converter so that said DC/DC converter may perform the step-down operation as the operation of a step-down type converter when a result of the comparison delivered from said voltage comparison means indicates that said input voltage is higher than said output voltage, and that it may perform the step-up operation as the operation of a step-up type converter when the result of said comparison indicates that said output voltage is higher than said input voltage. - View Dependent Claims (2, 3, 4)
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5. In a DC/DC converter as to which a varying range of an input voltage not stabilized contains a value of an output voltage stabilized, and which requires both operations of step-up and step-down;
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a step-up/down DC/DC converter comprising; voltage comparison means for comparing the output voltage and a set voltage correspondent to the input voltage; and operation changeover control means for controlling changeover of the operations of the DC/DC converter so that said DC/DC converter may perform the step-down operation as the operation of a step-down type converter when a result of the comparison delivered from said voltage comparison means indicates that the set voltage correspondent to said input voltage is higher than said output voltage, and that it may perform the step-up operation as the operation of a step-up type converter when the result of said comparison indicates that said output voltage is higher than said set voltage correspondent to said input voltage.
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6. In a DC/DC converter as to which a varying range of an input voltage not stabilized contains a value of an output voltage stabilized, and which requires both operations of step-up and step-down;
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a step-up/down DC/DC converter comprising; voltage comparison means for comparing the input voltage and a set voltage correspondent to the output voltage; and operation changeover control means for controlling changeover of the operations of the DC/DC converter so that said DC/DC converter may perform the step-down operation as the operation of a step-down type converter when a result of the comparison delivered from said voltage comparison means indicates that said input voltage is higher than the set voltage correspondent to said output voltage, and that it may perform the step-up operation as the operation of a step-up type converter when the result of said comparison indicates that said set voltage correspondent to said output voltage is higher than said input voltage.
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7. In a DC/DC converter as to which a varying range of an input voltage not stabilized contains a value of an output voltage stabilized, and which requires both operations of step-up and step-down;
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a step-up/down DC/DC converter comprising; voltage comparison means for comparing the output voltage and a voltage value with an offset bestowed on the input voltage; and operation changeover control means for controlling changeover of the operations of the DC/DC converter so that said DC/DC converter may perform the step-down operation as the operation of a step-down type converter when a result of the comparison delivered from said voltage comparison means indicates that the voltage value with the offset bestowed on said input voltage is larger than said output voltage, and that it may perform the step-up operation as the operation of a step-up type converter when the result of said comparison indicates that said output voltage is larger than said voltage value with said offset bestowed on said input voltage.
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8. In a DC/DC converter as to which a varying range of an input voltage not stabilized contains a value of an output voltage stabilized, and which requires both operations of step-up and step-down;
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a step-up/down DC/DC converter comprising; voltage comparison means for comparing the input voltage and a voltage value with an offset bestowed on the output voltage; and operation changeover control means for controlling changeover of the operations of the DC/DC converter so that said DC/DC converter may perform the step-down operation as the operation of a step-down type converter when a result of the comparison delivered from said voltage comparison means indicates that said input voltage is larger than the voltage value with the offset bestowed on said output voltage, and that it may perform the step-up operation as the operation of a step-up type converter when the result of said comparison indicates that said voltage value with said offset bestowed on said output voltage is larger than said input voltage.
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9. In a DC/DC converter as to which a varying range of an input voltage not stabilized contains a value of an output voltage stabilized, and which requires both operations of step-up and step-down;
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a step-up/down DC/DC converter comprising; error comparison means for comparing an error between the output voltage and a reference voltage, with an oscillation voltage of a certain oscillator; and control means for controlling the operations of the DC/DC converter so that said DC/DC converter may start the step-down operation as the operation of a step-down type converter when a duty factor of a pulse wave delivered from said error comparison means has reached 0 %!, and that it may start the step-up operation as the operation of a step-up type converter when the duty factor has reached 100 %!. - View Dependent Claims (10, 11, 12)
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Specification