SWITCHING POWER SUPPLY WITH SWITCHING CIRCUITS
First Claim
1. A switching power supply, comprising:
- a first switching unit which receives an input voltage from an external power source and performs a first switching operation to intermittently receive a first electric current from the external power source and to produce a first voltage, different from the input voltage, from the input voltage and the first electric current;
a second switching unit which receives the input voltage from the external power source and performs a second switching operation to intermittently receive a second electric current from the external power source and to produce a second voltage, different from the input voltage, from the input voltage and the second electric current; and
an output terminal which receives the first voltage of the first switching unit and the second voltage of the second switching unit and through which an output voltage obtained by combining the first and second voltages is outputted,wherein a maximum value of the first electric current is higher than a maximum value of the second electric current.
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Accused Products
Abstract
A switching power supply has first and second switching units and a control unit. Each switching unit has a switching element performing a switching operation to intermittently receive electric current from a battery while accumulating electric power in a coil and discharging this power to an output terminal. A resistor earthed is serially connected with each switching element. The resistance of the first resistor receiving the first current from the first switching element is lower than that of the second resistor receiving the second current from the second switching element. A maximum value of the first current is higher than that of the second current due to the difference between the resistors. The control unit controls the switching operations of the elements to boost the voltage of the battery and stops the switching operations in response to the first current exceeding an upper value.
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Citations
15 Claims
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1. A switching power supply, comprising:
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a first switching unit which receives an input voltage from an external power source and performs a first switching operation to intermittently receive a first electric current from the external power source and to produce a first voltage, different from the input voltage, from the input voltage and the first electric current; a second switching unit which receives the input voltage from the external power source and performs a second switching operation to intermittently receive a second electric current from the external power source and to produce a second voltage, different from the input voltage, from the input voltage and the second electric current; and an output terminal which receives the first voltage of the first switching unit and the second voltage of the second switching unit and through which an output voltage obtained by combining the first and second voltages is outputted, wherein a maximum value of the first electric current is higher than a maximum value of the second electric current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification