Power converter with adjustable output voltage

Abstract

An adjustable output voltage power converter. The power converter has a positive voltage output terminal, a negative voltage output terminal, a voltage comparator, a voltage-regulating reactance and a current source. The second input terminal picks up a reference voltage. The voltage comparator has a first input terminal, a second input terminal and a compare output terminal. The compare output terminal is electrically connected to one terminal of a feedback reactance. The first input terminal is electrically connected to the other terminal of the feedback reactance and one terminal of a loading reactance. The other terminal of the loading reactance is electrically connected to the current source and one terminal of the voltage-regulating reactance. The other terminal of the voltage-regulating reactance is electrically connected to the positive voltage output terminal.

What is claimed is:  
     
         1 . An adjustable output voltage power converter having a positive voltage input terminal and a negative voltage output terminal, comprising: 
 a voltage comparator having a first input terminal, a second input terminal and a compare output terminal;    a voltage-regulating reactance; and    a current source; 
 wherein the compare output terminal of the voltage comparator is electrically coupled to one terminal of a feedback reactance, the first input terminal is electrically coupled to the other terminal of the feedback reactance and one terminal of the loading reactance, the other terminal of the loading reactance is electrically coupled to the current source and one terminal of the voltage-regulating reactance, the other terminal of the voltage-regulating reactance is electrically coupled to the positive output voltage terminal, and the second input terminal is electrically connected to a terminal that provides a reference voltage.  
   
     
     
         2 . The power converter of  claim 1 , wherein the reference voltage is provided by a digital-to-analogue converter, and the digital-to-analogue converter is a device that picks up a voltage identification code and outputs a reference voltage accordingly.  
     
     
         3 . The power converter of  claim 1 , wherein the power-regulating reactance includes a resistor.  
     
     
         4 . An adjustable output voltage power converter having a positive voltage input terminal and a negative voltage output terminal, comprising: 
 a voltage comparator having a first input terminal, a second input terminal and a compare output terminal;    a digital-to-analogue converter having a reference voltage output terminal and a negative output terminal, wherein the digital-to-analogue converter receives a voltage identification code and outputs a reference voltage corresponding to the voltage identification code at the reference voltage output terminal of the digital-to-analogue converter;    a voltage-regulating reactance; and    a current source; 
 wherein the compare output terminal is electrically coupled to one terminal of a feedback reactance, the first input terminal is electrically coupled to the other terminal of the feedback reactance and one terminal of the loading reactance, the other terminal of the loading reactance is electrically coupled to the positive voltage output terminal, and the second input terminal is electrically coupled to a terminal that provides a reference voltage;  
 wherein the negative output terminal is electrically coupled to the current source and one terminal of the voltage-regulating reactance, and the other terminal of the voltage-regulating reactance is electrically coupled to the negative voltage output terminal.  
   
     
     
         5 . The power converter of  claim 4 , wherein the voltage-regulating reactance includes a resistor.  
     
     
         6 . An adjustable output voltage power converter having a positive voltage input terminal and a negative voltage output terminal, comprising: 
 a voltage comparator having a first input terminal, a second input terminal and a compare output terminal;    a digital-to-analogue converter having a reference voltage output terminal and a negative output terminal, wherein the digital-to-analogue converter receives a voltage identification code and outputs a reference voltage corresponding to the voltage identification code at the reference voltage output terminal of the digital-toanalogue converter;    a first voltage-regulating reactance;    a second voltage-regulating reactance; and    a current source having a first terminal and a second terminal; 
 wherein the compare output terminal is electrically coupled to one terminal of a feedback reactance, the first input terminal is electrically coupled to the other terminal of the feedback reactance and one terminal of the loading reactance, the other terminal of the loading reactance is electrically coupled to the first terminal of the current source and the first terminal of the first voltage-regulating reactance, the other terminal of the first voltage-regulating reactance is electrically coupled to the positive voltage output terminal, and the second input terminal is electrically coupled to a terminal that provides a reference voltage;  
 wherein the negative output terminal is electrically coupled to the second terminal of the current source and one terminal of the second voltage-regulating reactance, and the other terminal of the second voltage-regulating reactance is electrically coupled to the negative voltage output terminal.  
   
     
     
         7 . The power converter of  claim 6 , wherein the first voltage-regulating reactance includes a resistor.  
     
     
         8 . The power converter of  claim 6 , wherein the second voltage-regulating reactance includes a resistor.  
     
     
         9 . An adjustable output voltage power converter having a positive voltage input terminal, a negative voltage output terminal and a pulse width modulation integrated circuit, wherein the pulse width modulation integrated circuit outputs an adjusted voltage to the positive voltage output terminal via a loading reactance according to an input voltage identification code, comprising: 
 a voltage-regulating reactance, wherein one terminal of the voltage-regulating reactance is electrically coupled to one terminal of the loading reactance and the other terminal is electrically coupled to the positive voltage output terminal; and    a current source, wherein one terminal of the current source is electrically coupled to the circuit path between the voltage-regulating reactance and the loading reactance.    
     
     
         10 . The power converter of  claim 9 , wherein the voltage-regulating reactance includes a resistor.  
     
     
         11 . An adjustable output voltage power converter having a positive voltage input terminal, a negative voltage output terminal and a pulse width modulation integrated circuit, wherein the pulse width modulation integrated circuit has a negative output terminal and outputs an adjusted voltage to the positive voltage output terminal via a loading reactance according to an input voltage identification code, comprising: 
 a voltage-regulating reactance, wherein one terminal of the voltage-regulating reactance is electrically coupled to one terminal of the loading reactance and the other terminal is electrically coupled to the negative voltage output terminal; and    a current source, wherein one terminal of the current source is electrically coupled to the circuit path between the voltage-regulating reactance and the negative output terminal.    
     
     
         12 . The power converter of  claim 11 , wherein the voltage-regulating reactance includes a resistor.  
     
     
         13 . An adjustable output voltage power converter having a positive voltage input terminal, a negative voltage output terminal and a pulse width modulation integrated circuit, wherein the pulse width modulation integrated circuit has a negative output terminal and outputs an adjusted voltage to the positive voltage output terminal via a loading reactance according to an input voltage identification code, comprising: 
 a first voltage-regulating reactance, wherein one terminal of the first voltage-regulating reactance is electrically coupled to one terminal of the loading reactance and the other terminal is electrically coupled to the positive voltage output terminal;    a second voltage-regulating reactance, wherein one terminal of the second voltage-regulating reactance is electrically coupled to one terminal of the negative output terminal and the other terminal is electrically coupled to the negative voltage output terminal; and    a current source, wherein one terminal of the current source is electrically coupled to the circuit path between loading reactance and the first voltage-regulating reactance and the other terminal of the current source is electrically coupled to the circuit path between the negative output terminal and the second voltage-regulating reactance.    
     
     
         14 . The power converter of  claim 13 , wherein the first voltage-regulating reactance includes a resistor.  
     
     
         15 . The power converter of  claim 13 , wherein the second voltage-regulating reactance includes a resistor.