Conversion and control of electrical energy by electromagnetic induction

• US 4,112,347 A
• Filed: 01/26/1977
• Issued: 09/05/1978
• Est. Priority Date: 11/25/1975
• Status: Expired due to Term

• Current Assignee: Nathan A. Moerman
• Original Assignee: Nathan A. Moerman
• Inventors: Moerman, Nathan A.
• Primary Examiner(s): Goldberg, Gerald
• Application Number:
  US05/762,896
• Time in Patent Office: 587 Days
• Field of Search: 323/6, 323/20, 323/40, 323/48, 323/56, 323/57, 323/58, 323/60, 323/61, 363/152-154
• US Class Current: 323/250
• CPC Class Codes: G05F 1/38 semiconductor devices only
• CPC Class Codes: H01F 2029/143 with control winding for generating magnetic bias
• CPC Class Codes: H01F 29/14 with variable magnetic bias amplitude modulation by means of variable impedance element H03C1/08 ; magnetic amplifiers H03F; circuits for automatic telephonic communication H04M3/00
• CPC Class Codes: H01F 38/02 for non-linear operation
• CPC Class Codes: H02H 9/021 Current limitation using saturable reactors H02H9/023 takes precedence

Abstract

An alternating current power control circuit utilizing progressive variation of magnetic flux in associated magnetic paths. Voltage and current sensors at an output provide feedback signals to permeance control devices to apportion flux between a pair of magnetic paths such that the primary magnetizing current remains essentially unchanged during the control process.

Claims

1. In a control means for an electric power circuit,

an input,

an output,

a plurality of complete magnetic flux path means, one of said path means connecting said input and said output,

each of said path means including a means for progressively controlling the permeance thereof to maintain the magnetizing current relatively constant, and an induction means for effecting control of said power circuit,

a voltage comparator means including a first reference source and means for comparing said first reference source with the output voltage level and producing a voltage difference signal,

a current comparator means including a second reference source and means for comparing said second reference source with the output current level and producing a current difference signal,

a magnetic flux apportioning means responding to a selected one of said difference signals to establish control levels for said means for controlling permeance to stabilize said power circuit with respect to said voltage and current reference sources, and

means connecting said voltage and current comparator means between said output and said apportioning means.

2. In a control means for an electrically controlled system,

a plurality of complete magnetic flux path means, each of said path means including a means for progressively controlling the permeance thereof and an induction means for effecting control of said controlled system,

a feedback means for sensing a physical parameter in said controlled system,

a comparator means including a reference source and means for comparing said reference source with said physical parameter and producing a difference signal,

a magnetic flux apportioning means responding to said difference signal to establish control levels to said means for controlling permeance to stabilize said physical parameter with respect to said reference source, and means connecting said comparator means between said feedback means and said apportioning means.

3. In an electromagnetic induction device,

a first flux path including an input leg with an input winding coupled thereto, and an output leg with an output winding coupled thereto,

a second flux path including said input leg and a bypass leg,

a first permeance control means in said first flux path between said input leg and said output leg,

a second permeance control means in said second flux path between said input leg and said bypass leg,

means for sensing the voltage across said output winding,

means for sensing the current through said output winding, and

a complementary amplifier responsive to a selected one of said voltage and current sensing means and connected to said permeance control means to apportion flux between said first and second flux paths while maintaining the quantity of flux in said input leg relatively constant.

4. In combination,

a magnetic core structure including an input element having first and second ends, an output element having first and second ends, a bypass element having first and second ends, a first permeance control section having first and second ends, a second permeance control section having first and second ends, said first end of said bypass element integral with said first end of said first permeance control section, said second end of said bypass element integral with said first end of said input element, said first end of said output element integral with said first end of said second permeance control section, said second end of said output element integral with said second end of said input element, said first end of said input element integral with said second ends of said first and said second permeance control sections,

input winding means coupled to said input element,

output winding means coupled to said output element, said output winding means having two output leads,

first control means responsive to current changes in one of said output leads,

second control means responsive to voltage changes in the other of said output leads,

means for connecting a selected one of said first and second control means to said permeance control means, and

means responsive to said control means for selectively apportioning magnetizing current between said output element and said bypass element such that the magnetizing current in said input element remains relatively constant.

5. An electromagnetic induction means for the conversion of an alternating current input into a controlled variable alternating current voltage output comprising:

a variable permeance magnetic path means made up of first, second and third sections,

each of said sections having first and second ends,

an input winding means surrounding said first section,

an output winding means having load and common connections and surrounding said second section,

a first permeance control means electromagnetically coupled between said first ends of said first and second sections,

said second ends of said first, second and third sections joined to each other,

a second permeance control means electromagnetically coupled between said first ends of said first and third sections,

a feedback means,

a reference voltage means,

an output voltage setting means,

means connecting said feedback means to said load connection of said output winding means and to said reference voltage means,

means connecting said reference voltage means to said output voltage setting means, and

an amplifier connecting said voltage setting means to said first and second permeance control means to control said output voltage by effecting a complementary variation of permeance within said second and third sections while maintaining the permeance in said first section relatively constant.

6. An electromagnetic induction means for the conversion of an alternating current input into a controlled current comprising:

a variable permeance magnetic path means made up of first, second and third sections,

each of said sections having first and second ends,

an input winding means surrounding said first section,

an output winding means having load and common connections and surrounding said second section,

a first permeance control means electromagneitcally coupled between said first ends of said first and second section,

a second permeance control means electromagnetically coupled between said first ends of said first and third sections,

said second ends of said first, second and third sections joined to each other,

a current sensing means,

a feedback means,

a reference voltage means,

an output current setting means,

means connecting said feedback means to said current sensing means and the common connection of said output winding means and to said reference voltage means,

means connecting said reference voltage means to said output current setting means, and

an amplifier connecting said current setting means to said first and said second permeance control means to control said output current by effecting a complementary variation of permeance within said second and third sections while maintaining the permeance in said first section relatively constant.

7. An electromagnetic induction means for the control and stabilization of alternating current power at a load from an alternating current power source comprising,

an alternating current power transformer means including a first closed magnetic path about an input leg and an output leg, and a second closed magnetic paths about the input leg and a bypass leg,

a first permeance control section coupling said input leg to the output leg in said first closed magnetic path, and

a second permeance control section coupling said input leg to the by-pass leg in said second closed magnetic path,

an alternating current power input winding means surrounding said input leg,

an alternating current power output winding means surrounding said output leg,

said output winding means having a pair of output leads,

a load current sensor means,

a load terminal means connected to one of said output winding leads in series with said current sensor means,

a first voltage comparator means including a stabilized voltage reference and an output voltage setting control means,

a voltage feedback means coupled from said load terminals to said first voltage comparator means,

a voltage error signal amplifier means,

means connecting the output of said first voltage comparator means to said voltage error signal amplifier means,

a second voltage comparator means including a stabilized reference voltage and an output current setting control,

a feedback current sensing means coupled to said current sensor and to said second voltage comparator means,

a current error signal amplifier means,

means connecting the output of said second voltage comparator means to said current error signal amplifiers means,

means connecting the output of said second voltage comparator means to said current error signal amplifier means,

a control mode selector means,

means connecting the outputs of said voltage error amplifier means and said current error amplifier means as the inputs to said control mode selector means, and

a permeance control complementary amplifier means coupling said mode selector means and said first and second permeance control sections for selectively apportioning the magnetic flux between said first and second closed magnetic paths while maintaining the magnetic flux in said input leg relatively constant,

whereby electromagnetic induction in said alternating current power output winding means produces a stabilized alternating current voltage at the terminals of said load means in response to said first voltage comparator means with said control mode selector means enabling voltage mode operation,

whereby electromagnetic induction in said alternating current power output winding means produces a stabilized output alternating power current to said load means in response to said second voltage comparator means and with said control mode selector means enabling current mode operation.