Rechargeable/portable multi-voltage dc power supply
First Claim
Patent Images
1. A rechargeable/portable multi-voltage DC power supply comprising:
- a rechargeable batter (80);
a switching power supply converting circuit (40) coupled to said rechargeable battery (80) for generating an output voltage;
a filter circuit (60) connected to said switching power supply converting circuit (40) for filtering said output voltage;
a feedback ratio circuit (20) being connected to said switching power supply converting circuit (40) and comprising a plurality of transistors, each of which is connected with a corresponding resistor having different resistance at the collector electrode thereof, and providing one of a plurality of feedback voltages which are determined by an effective resistance of said feedback ratio circuit (20);
a pulse width modulation circuit (50) having an input end connected to said feedback ratio circuit (20) for receiving said feedback voltage, and an output end connected to said switching power supply converting circuit (40);
a selection circuit (10) connected to said feedback ratio circuit (20) operable to determine said resistance of said feedback ratio circuit (20) thus further determining said output voltage; and
whereby said switching power supply converting circuit (40), said pulse width modulation circuit (50), and said filter circuit (60) constitutes a switching power supply.
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Abstract
A rechargeable/portable multi-voltage DC power supply includes an Ni-Cd rechargeable battery set connected to a switching power supply converting circuit, a pulse width modulation circuit, and a filter circuit for providing a regulated output voltage from the filter circuit. A button switch cooperates with a selection circuit and a feedback ratio circuit for selecting a specific output voltage from a plurality of available output voltages. A plurality of light emitting diodes are connected to the selection circuit for indicating the value of the output voltage.
54 Citations
8 Claims
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1. A rechargeable/portable multi-voltage DC power supply comprising:
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a rechargeable batter (80); a switching power supply converting circuit (40) coupled to said rechargeable battery (80) for generating an output voltage; a filter circuit (60) connected to said switching power supply converting circuit (40) for filtering said output voltage; a feedback ratio circuit (20) being connected to said switching power supply converting circuit (40) and comprising a plurality of transistors, each of which is connected with a corresponding resistor having different resistance at the collector electrode thereof, and providing one of a plurality of feedback voltages which are determined by an effective resistance of said feedback ratio circuit (20); a pulse width modulation circuit (50) having an input end connected to said feedback ratio circuit (20) for receiving said feedback voltage, and an output end connected to said switching power supply converting circuit (40); a selection circuit (10) connected to said feedback ratio circuit (20) operable to determine said resistance of said feedback ratio circuit (20) thus further determining said output voltage; and whereby said switching power supply converting circuit (40), said pulse width modulation circuit (50), and said filter circuit (60) constitutes a switching power supply. - View Dependent Claims (2, 3, 4, 5)
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6. A rechargeable/portable multi-voltage DC power supply having a power supply body (90) which has a flashlight at the front end thereof and a rechargeable battery set (81) installed therein, the improvement comprising:
said power supply body (90) having a displaying plate (1) comprising a plurality of light emitting diodes (30) at the top surface thereof for showing the output voltage and a button switch (14) operable to select a specific output voltage from a plurality of available voltage values, a plurality of output sockets (61, 62, and
63) formed at one side thereof for outputting said specific output voltage, a switching power supply comprising a switching power supply converting circuit (40), a pulse width modulation circuit (50), and a filter circuit (60) for supply the output voltage, a feedback ratio circuit (20) comprising a plurality transistors (21 to
28) and resistors for providing a feedback voltage to said pulse width modulation circuit (50), a selection circuit (10) having a decoder (11) which has a clock input terminal (CLK) for receiving a pulse signal from operation of said button switch (11) and a plurality of output terminals (Q0 to Q9) each of which is connected to a corresponding triggering electrode of said transistor of said feedback ratio circuit (20), such that said decoder (11) is allowed to have a logical high output at one of the output terminals (Q0 to Q9) thereof and further causing a corresponding effective resistance of said feedback ratio circuit (20), thus causing a corresponding output voltage from said filter circuit (60).- View Dependent Claims (7, 8)
Specification