Power converter with output voltage level indicating device

Abstract

A power converter with output voltage level indicating device is disclosed. The power converter includes a casing, an interior of which is disposed with a control circuit. The control circuit includes a feedback circuit and a DC-to-DC conversion circuit. The feedback circuit is coupled to the DC-to-DC conversion circuit and connected to a level-selecting terminal by at least one resistor to provide a feedback signal to the DC-to-DC conversion circuit which in turn changes the voltage level of the DC output. An output socket is formed at the casing, which is connected with the control circuit. The output socket includes two primary, power terminals and at least one secondary, level-selecting terminals. A level-selecting terminal device is connected to the output socket via an extension cable for getting the DC voltage and supplying the DC voltage to an appliance via an output terminal. A display device is provided at the casing for showing the output voltage level to the output terminal of the level-selecting terminal device.

1 - 16 . (canceled)  
   
   
       17 . A power converter comprising: 
 a casing;    at least one rechargeable battery, which is disposed in an interior of the casing for supplying a DC voltage;    an output socket disposing at one side of the casing and connecting to a circuit board, which comprises two primary, power terminals and at least one secondary, level-selecting terminal;    the circuit board disposing at the interior of the casing, which comprises a control circuit including a feedback circuit and a DC-to-DC conversion circuit, in which the feedback circuit is coupled to the DC-to-DC conversion circuit and connected to the level-selecting terminal;    a level-selecting terminal device, which is engageable with the output socket and comprises two primary, power terminals and at least one secondary, level-selecting terminal, and when the level-selecting terminal device is connected to the output socket, the primary and secondary terminals of the level-selecting terminal device are respectively connected to the primary and secondary terminals of the output socket for receiving the selectable DC voltage therefrom and transmitting the DC voltage through an output terminal of the level-selecting terminal device;    a display device, which is connected with the control circuit to display the voltage level of the DC output voltage at the output terminal of the level-selecting terminal device.    
   
   
       18 . The power converter as claimed in  claim 17 , wherein the display circuit comprises a plurality of indicators, each of which corresponds to a different DC voltage level for indicating the output voltage level from the output socket.  
   
   
       19 . The power converter as claimed in  claim 17 , wherein the display circuit comprises a liquid crystal display unit for displaying the output voltage level from the output socket.  
   
   
       20 . The power converter as claimed in  claim 17 , wherein the casing further comprises an input socket, with which a plug of a power cord connecting to a power source is engageable for charging the rechargeable battery by a charging circuit.  
   
   
       21 . The power converter as claimed in  claim 17 , wherein the power converter further comprises a connector connecting to a plug via an extension cable, the plug being engageable with the output socket of the casing and the connector comprising two primary, power terminals and at least one secondary, level-selecting terminal in corresponding to the primary and secondary terminals of the output socket.  
   
   
       22 . The power converter as claimed in  claim 17 , wherein each level-selecting terminal of the output socket being connected to the feedback circuit by a resistor, and the level-selecting terminal device comprises a plurality of jump connections, wherein by selective use of the jump connection, a different resistance is observed which changes the feedback signal and thereby changes the output level of voltage at the output terminal of the level-selecting terminal device.  
   
   
       23 . The power converter as claimed in  claim 17 , wherein the display device is disposed on a top of the casing.  
   
   
       24 . The power converter as claimed in  claim 21 , wherein the display device is disposed on the connector.  
   
   
       25 . A power converter comprising: 
 a casing;    a DC power socket, which is incorporated with the casing for receiving a DC power therefrom;    an output socket disposing at one side of the casing and connecting to a circuit board, which comprises two primary, power terminals and at least one secondary, level-selecting terminal;    the circuit board disposing at the interior of the casing, which comprises a control circuit including a feedback circuit and a DC-to-DC conversion circuit, in which the feedback circuit is coupled to the DC-to-DC conversion circuit and connected to the level-selecting terminal;    a level-selecting terminal device, which is engageable with the output socket and comprises two primary, power terminals and at least one secondary, level-selecting terminal, and when the level-selecting terminal device is connected to the output socket, the primary and secondary terminals of the level-selecting terminal device are respectively connected to the primary and secondary terminals of the output socket for receiving the selectable DC voltage therefrom and transmitting the selectable DC voltage through an output terminal of the level-selecting terminal device;    a display device, which is connected with the control circuit to display the voltage level of the DC output voltage at the output terminal of the level-selecting terminal device.    
   
   
       26 . The power converter as claimed in  claim 25 , wherein the display circuit comprises a plurality of indicators, each of which corresponds to a different DC voltage level for indicating the output voltage level from the output socket.  
   
   
       27 . The power converter as claimed in  claim 25 , wherein the display circuit comprises a liquid crystal display unit for displaying the output voltage level from the output socket.  
   
   
       28 . The power converter as claimed in  claim 25 , wherein the power converter further comprises a connector connecting to a plug via an extension cable, the plug being engageable with the output socket of the casing and the connector comprising two primary, power terminals and at least one secondary, level-selecting terminal in corresponding to the primary and secondary terminals of the output socket.  
   
   
       29 . The power converter as claimed in  claim 25 , wherein the output socket each level-selecting terminal of the output socket being connected to the feedback circuit by a resistor, and the level-selecting terminal device comprises a plurality of jump connections, wherein by selective use of the jump connection, a different resistance is observed which changes the feedback signal and thereby changes the output level of voltage at the output terminal of the level-selecting terminal device.  
   
   
       30 . The power converter as claimed in  claim 25 , wherein the display device is disposed on a top of the casing.  
   
   
       31 . The power converter as claimed in  claim 28 , wherein the display device is disposed on the connector.  
   
   
       32 . A power converter comprising: 
 a casing;    an alternating current plug, which is incorporated with the casing and is engageable with an AC socket for receiving an AC power therefrom;    an output socket disposing at one side of the casing and connecting to a circuit board, which comprises two primary, power terminals and at least one secondary, level-selecting terminal;    the circuit board disposing at the interior of the casing, comprising a control circuit and an AC-to-DC conversion circuit, in which the control circuit includes a feedback circuit and a DC-to-DC conversion circuit, and the feedback circuit is coupled to the DC-to-DC conversion circuit and connected to the level-selecting terminal, and the AC-to-DC conversion circuit converts the AC power from AC socket into DC power;    a level-selecting terminal device, which is engageable with the output socket and comprises two primary, power terminals and at least one secondary, level-selecting terminal, and when the level-selecting terminal device is connected to the output socket, the primary and secondary terminals of the level-selecting terminal device are respectively connected to the primary and secondary terminals of the output socket for receiving the selectable DC voltage therefrom and transmitting the selectable DC voltage through an output terminal of the level-selecting terminal device;    a display device, which is connected with the control circuit to display the voltage level of the DC output voltage at the output terminal of the level-selecting terminal device.    
   
   
       33 . The power converter as claimed in  claim 32 , wherein the display circuit comprises a plurality of indicators, each of which corresponds to a different DC voltage level for indicating the output voltage level from the output socket.  
   
   
       34 . The power converter as claimed in  claim 32 , wherein the display circuit comprises a liquid crystal display unit for displaying the output voltage level from the output socket.  
   
   
       35 . The power converter as claimed in  claim 32 , wherein the power converter further comprises a connector connecting to a plug via an extension cable, the plug being engageable with the output socket of the casing and the connector comprising two primary, power terminals and at least one secondary, level-selecting terminal in corresponding to the primary and secondary terminals of the output socket.  
   
   
       36 . The power converter as claimed in  claim 32 , wherein each level-selecting terminal of the output socket being connected to the feedback circuit by a resistor, and the level-selecting terminal device comprises a plurality of jump connections, wherein by selective use of the jump connection, a different resistance is observed which changes the feedback signal and thereby changes the output level of voltage at the output terminal of the level-selecting terminal device.  
   
   
       37 . The power converter as claimed in  claim 32 , wherein the display device is disposed on a top of the casing.  
   
   
       38 . The power converter as claimed in  claim 35 , wherein the display device is disposed on the connector.  
   
   
       39 . A power converter comprising: 
 an output socket comprising two primary, power terminals and at least one secondary, level-selecting terminal;    a circuit board comprising a control circuit including a feedback circuit and a DC-to-DC conversion circuit, in which the feedback circuit is coupled to the DC-to-DC conversion circuit and connected to the level-selecting terminal;    a level-selecting terminal device, which is engageable with the output socket and comprises two primary, power terminals and at least one secondary, level-selecting terminal, and when the level-selecting terminal device is connected to the output socket, the primary and secondary terminals of the level-selecting terminal device are respectively connected to the primary and secondary terminals of the output socket for receiving the selectable DC voltage therefrom and transmitting the DC voltage through an output terminal of the level-selecting terminal device;    a display device, which is connected with the control circuit to display the voltage level of the DC output voltage at the output terminal of the level-selecting terminal device.    
   
   
       40 . The power converter as claimed in  claim 39 , wherein the display circuit comprises a plurality of indicators, each of which corresponds to a different DC voltage level for indicating the output voltage level from the output socket.  
   
   
       41 . The power converter as claimed in  claim 39 , wherein the display circuit comprises a liquid crystal display unit for displaying the output voltage level from the output socket.