Bias transformer for dual voltage input off-line converters

Claim 2

Circuit means containing means for connecting said circuit means to a source of AC input voltage of a first value and alternatively of a second value, said circuit means containing first means for providing a single level DC output voltage in response to input voltage of said first and alternatively said second value and second means for providing a single level AC output voltage in response to input voltage of said first and alternatively said second value, said second means comprising a transformer the entire primary winding of which is connected by said first means directly to said source of first value and alternatively indirectly through said first means to said source of second value.

Claim 3

Converter means containing first circuit means for providing a single level DC output voltage and second circuit means for providing a single level AC output voltage; said first circuit means including a rectifier bridge circuit means containing means for connecting said converter means to a source of AC input voltage of a first value and alternatively of a second value, a switch means having a first position and alternatively second position for connecting said rectifier bridge circuit to an output means; said second circuit means comprising a transformer the entire primary winding of which is connected by said switch in its first position to said source of AC input voltage of first value and by said switch in its second position to said source of second value via the midpoint of said output means.

Claim 4

Converter means containing first circuit means for providing a single level DC output voltage and second circuit means for providing a single level AC output voltage; said first circuit means including a rectifier bridge circuit means containing means for connecting said converter means to a source of AC input voltage of a first value and alternatively of a second value, a switch means having a first position and alternatively second position for connecting said rectifier bridge circuit to an output means; said second circuit means comprising a transformer the entire primary winding of which is connected by said switch in its first position to said source of AC input voltage of first value and by said switch in its second position to said source of second value via the midpoint of said output means.

Claim 5

A converter means as claimed in claim 2 wherein said entire primary winding of said transformer is connected to said first circuit means when said switch means is in said first position.

Claim 6

A converter means as claimed in claim 2 wherein said entire primary winding of said transformer is connected across said source of AC input voltage when said switch means is in said second alternative position.

Claim 7

A converter means as claimed in claim 4 wherein said switch means connects said mid-point of said output means to said means for connection of said rectifier bridge circuit means to said source of AC input voltage source.

Claim 8

A converter means as claimed in claim 2 wherein said source of AC input voltage of said first value is twice the value of said alternatively second AC input voltage.

Claim 9

A converter means as claimed in claim 2 wherein said first circuit means operates as a full wave bridge rectifier circuit when said switch means is in said first position.

Claim 10

A converter means as claimed in claim 2 wherein said output means is a series connected capacitor filter means and wherein said first circuit means operates as a full wave voltage doubler circuit when said switch means is in said alternatively second position.

Claim 11

A converter means containing means for connecting said converter means to a source of AC input voltage of a first value and alternatively of a second value, said converter means containing first circuit means for providing a single level DC output voltage in response to input voltage of said first and alternatively said second value and second circuit means for providing a single level AC output voltage in response to input voltage of said first and alternatively said second value, said first circuit means including a series connected capacitor filter means, said second circuit means comprising a transformer the entire primary windIng of which is connected between a first connecting means for connecting one side of said primary winding to said input voltage source and a second connecting means for connecting the other side of said primary winding to the mid-point of said series connected capacitor filter means.

Claim 12

A converter means containing means for connecting said converter means to a source of AC input voltage of a first value and alternatively of a second value, said converter means containing first circuit means for providing a single level DC output voltage in response to input voltage of said first and alternatively said second value and second circuit means for providing a single level AC output voltage in response to input voltage of said first and alternatively said second value, said first circuit means including a series connected capacitor filter means, said second circuit means comprising a transformer the entire primary windIng of which is connected between a first connecting means for connecting one side of said primary winding to said input voltage source and a second connecting means for connecting the other side of said primary winding to the mid-point of said series connected capacitor filter means.

Claim 13

A converter means as claimed in claim 9 wherein said first circuit means includes a rectifier bridge circuit means connected to said means for connecting said converter means to said source of AC input voltage, a switch means having a first position and alternatively second position, said alternatively second position connecting said mid-point of said series connected capacitor filter means to said means for connecting said converter means to said source of AC input voltage.

Claim 14

A converter means as claimed in claim 10 wherein said first circuit means operates as a full wave bridge rectifier circuit when said switch means is in said first position.

Claim 15

A converter means as claimed in claim 10 wherein said first circuit means operates as a full wave voltage doubler circuit when said switch means is in said alternatively second position.

Claim 16

A converter means containing a first and second circuit means, said first circuit means containing a first and second connecting means for connecting said converter means to a source of AC input voltage of a first value and alternatively of a second value, said first circuit means including a switch means connecting an output means to said first connecting means, said second circuit means comprising a transformer the entire primary winding of which is connected between a third and fourth connecting means, said third connecting means connecting one side of said primary winding to said second connecting means included in said first circuit means, said fourth connecting means connecting the other side of said primary winding to said output means included in said first circuit means, said transformer means receiving the full voltage input to said first and second connecting means when said switch means is in a first position, said transformer means receiving from said first circuit means one half the voltage input to said first and second connecting means when said switch is in an alternatively second position, the output of said transformer being a single level AC voltage.

Claim 17

A converter means containing a first and second circuit means, said first circuit means containing a first and second connecting means for connecting said converter means to a source of AC input voltage of a first value and alternatively of a second value, said first circuit means including a switch means connecting an output means to said first connecting means, said second circuit means comprising a transformer the entire primary winding of which is connected between a third and fourth connecting means, said third connecting means connecting one side of said primary winding to said second connecting means included in said first circuit means, said fourth connecting means connecting the other side of said primary winding to said output means included in said first circuit means, said transformer means receiving the full voltage input to said first and second connecting means when said switch means is in a first position, said transformer means receiving from said first circuit means one half the voltage input to said first and second connecting means when said switch is in an alternatively second position, the output of said transformer being a single level AC voltage.

Claim 18

A converter means containing a first means for connecting said converter means to a source of AC input voltage of a first value and alternatively of a second value and a second means for connection to a load, said second means containing a first and second circuit means, said first circuit means delivering DC power to said load in response to input voltage of said first and alternatively said second value, said second circuit means delivering AC bias power to said load in response to input voltage of said first and alternatively said second value, said first circuit means including a rectifier bridge circuit means, a switch means, and a series capacitor filter means, said second circuit means comprising a transformer the entire primary winding of which is connected between a first and second connecting means, said first connecting means connecting one side of said primary winding to one input side of said rectifier bridge circuit means and through said first means to one side of said source of AC input voltage, said first means connecting the other side of said source of AC input voltage to the other input side of said rectifier bridge circuit means, said switch means connecting said other input side of said rectifier bridge circuit means to the mid-point of said series capacitor filter means, the output of said rectifier bridge circuit means delivering said DC power to said load being across said series capacitor filter means, said second connecting means connecting the other side of said primary winding to said mid-point of said series capacitor filter means, said switch means operating in a first position so as to enable said first circuit means to providE a DC output of twice the voltage as is delivered by said first circuit means when said switch means is in an alternatively second position, said primary winding receiving over said first and second connector means the same AC voltage during both positions of said switch means.

Claim 19

A converter means containing a first means for connecting said converter means to a source of AC input voltage of a first value and alternatively of a second value and a second means for connection to a load, said second means containing a first and second circuit means, said first circuit means delivering DC power to said load in response to input voltage of said first and alternatively said second value, said second circuit means delivering AC bias power to said load in response to input voltage of said first and alternatively said second value, said first circuit means including a rectifier bridge circuit means, a switch means, and a series capacitor filter means, said second circuit means comprising a transformer the entire primary winding of which is connected between a first and second connecting means, said first connecting means connecting one side of said primary winding to one input side of said rectifier bridge circuit means and through said first means to one side of said source of AC input voltage, said first means connecting the other side of said source of AC input voltage to the other input side of said rectifier bridge circuit means, said switch means connecting said other input side of said rectifier bridge circuit means to the mid-point of said series capacitor filter means, the output of said rectifier bridge circuit means delivering said DC power to said load being across said series capacitor filter means, said second connecting means connecting the other side of said primary winding to said mid-point of said series capacitor filter means, said switch means operating in a first position so as to enable said first circuit means to providE a DC output of twice the voltage as is delivered by said first circuit means when said switch means is in an alternatively second position, said primary winding receiving over said first and second connector means the same AC voltage during both positions of said switch means.

Claim 20

A converter means as claimed in claim 14 wherein said first input voltage is twice the value of said alternatively second input voltage.