Electromagnetic drive control system

Patent metadata

Field	Value
Publication number	US-10186987-B2
Application number	US-201415023402-A
Country	US
Kind code	B2
Filing date	Sep 9, 2014
Priority date	Sep 30, 2013
Publication date	Jan 22, 2019
Grant date	Jan 22, 2019

Abstract

An electromagnetic drive control system comprising an H-shaped full bridge driving circuit connected to a controlled electromagnetic unit, including a first field effect transistor (FET) and a fourth FET connected in series constituting the left arm of the H-shaped full-bridge driving circuit, and a second FET and a third FET connected in series constituting the right arm of the H-shaped full-bridge driving circuit; PWM control unit is used to provide control signal to the FETs of the left and right bridge arms; it is characterized in that: the left arm comprises a first DC voltage source connected in series to the drain of the first FET, and the right arm includes a second DC voltage source connected in series to the drain of the second FET so as to form a dual power circuit; in this configuration, the first DC voltage source and the second DC voltage source are configured appropriately to greatly weaken the output current ripple of the electromagnetic drive control system and allow the system to realize super-high precision control of the electromagnetic drive control system under lower switching frequency, as a result, it can improve the stability of the system, reduce the loss of the system, and significantly decrease the cost of the drive controller.

First claim

The invention claimed is:

1. An electromagnetic drive system comprising:
four field effect transistors (FETs);
a controlled electromagnetic unit;
a PWM control unit;
a first and a second controlled DC voltage source; and
a switching device;
wherein the four FETS form an H-shaped full bridge driving circuit including a first FET and a fourth FET connected in series forming a left bridge arm, and a second FET and a third FET connected in series forming a right arm;
wherein the H-shaped full bridge driving circuit is connected to the controlled electromagnetic unit;
wherein the PWM control unit provides a control signal to the FETs on the left bridge arm and right bridge arm;
wherein the left arm comprises the first controlled DC voltage source connected in series to a drain of the first FET, and the right arm comprises the second controlled DC voltage source connected in series to a drain of the second FET, so as to form a dual power driving circuit including the switching device;
wherein the first controlled DC voltage source and the second controlled DC voltage source satisfy the following relations:

{

U

d
⁢

⁢
c
⁢

⁢
1

=

(

1
-
D

)

·

B
f

⁢
Δ
⁢

⁢

I
·
R

A

+

R
·

I
_

U

d
⁢

⁢
c
⁢

⁢
2

=

(

1
-
D

)

·

B
f

⁢
Δ
⁢

⁢

I
·
R

A

-

R
·

I
_

wherein,
U dc1 denotes the voltage of the controlled voltage source on the left bridge arm in the dual power driving circuit;
U dc2 denotes the voltage of the controlled voltage source on the right bridge arm in the dual power driving circuit;
R denotes the winding resistance of the controlled electromagnetic unit;
D denotes the duty cycle of the switching device in the dual power driving circuit;
Ī denotes the average current required in a switching period of the dual power driving circuit;
ΔI denotes the current fluctuation limit value in a switching period of the dual power driving circuit;
B f denotes the margin coefficient tolerating average output current and current fluctuation of the system of the dual power driving circuit, 0<B f ≤1; and
A denotes the current fluctuation coefficient of the controlled electromagnetic unit

A
=



e

-

R
L

⁢

(

1
-
D

)

⁢
T

+

e

-

R
L

⁢
DT

-

e

-

Assignees

• Harbin Inst Technology

Inventors

• Li Liyi
• Pan Donghua
• Guo Qingbo
• Hong Junjie

Classifications

• H02M2001/0054

  Electricity · mapped topic

• H02P7/04

  by means of a H-bridge circuit · CPC title

• H02M2003/1555

  Electricity · mapped topic

• H02M1/14

  Arrangements for reducing ripples from DC input or output · CPC title

• H02M7/5387 Primary

  in a bridge configuration · CPC title