KR20150144254A - Apparatus for driving SRM and Controlling Method thereof - Google Patents

Abstract

According to one embodiment of the present invention, a driving apparatus of a switched reluctance motor (SRM) may include: a converter which applies a DC voltage supplied from a power source unit to each phase winding of SRM; and a control unit which controls a switching operation of the converter in accordance with a driving state of the SRM.

Description

[0001] Apparatus for driving SRM and Controlling Method [

The present invention relates to an SRM motor driving apparatus and a control method thereof.

BACKGROUND ART A switched reluctance motor (hereinafter referred to as SRM) is a motor in which a switching control device is combined, and both a stator and a rotor are of a stator type.

Particularly, the winding is wound only on the stator part, and the structure is simple since the rotor part does not depend on any type of winding or permanent magnet.

Due to such a structural feature, it has a considerable advantage in terms of production and production, and has a good starting characteristic such as a direct current motor, a large torque, a small need for maintenance and repair, and a torque per unit volume, Efficiency, and the rating of the converter. As a result, the field of application is gradually increasing.

Such a switched reluctance motor has various types of single-phase, two-phase, and three-phase motors. Particularly, a two-phase SRM has a drive circuit that is simpler than a three-phase SRM and has attracted a great deal of attention in applications such as fans, blowers, and compressors have.

In the switching device of the two-phase SRM, many methods for controlling the current of the stator winding in a unidirectional manner have been proposed and used. In the proposed method, there is a switching device using an asymmetrical bridge converter for driving a conventional AC motor .

Furthermore, the asymmetric bridge converter has the most variety of control among the SRM driving converters, and the current control of each phase is independent, so that current superposition of the two phases is possible, which is suitable for high voltage and large capacity, and the rated voltage of the switch is relatively low.

10-271885JP

The present invention is intended to improve the power loss in the elements constituting the converter when the magnitude of the current flowing through the converter for applying current to each winding of the SRM is large in driving the SRM.

According to an aspect of the present invention, there is provided an SRM driving apparatus including a synchronous rectification switch that uses a synchronous rectification method in a current circulating unit of a converter, (Power loss) can be more effectively reduced.

That is, the SRM driving apparatus according to the present invention includes a converter for applying a DC voltage supplied from a power source unit to each phase line of the SRM through a switching operation, and a control unit for controlling the switching operation of the converter.

The converter includes a switching unit for applying the direct current voltage to each of the phase line of the SRM through the switching operation and a switching unit for switching the current circulation for circulating the current flowing in each phase line of the SRM in a predetermined direction ≪ / RTI >

Further, the current circulation unit includes a diode and a synchronous rectification switch which are alternately connected to one end of each phase line of the SRM, and the synchronous rectification switch has one end connected to the contact point of one of the phase line and the fourth switch of the SRM And the other end is connected to another phase line of the commercial SRM and a contact of the first switch. Here, the synchronous rectification switch may be a metal-oxide semiconductor (MOSFET).

The control unit controls the operation timing of the synchronous rectification switch to be synchronized with the operation timing of the third switch and the fourth switch, and comprises a controller and a PWM signal generation module.

More specifically, the controller synchronizes the turn-on (ON) timing of the synchronous rectification switch with the turn-on (ON) timing of the fourth switch, and turns on (ON) (OFF) timing.

The PWM signal generation module generates a PWM signal for controlling the ON and OFF operations of the synchronous rectification switch based on the control signal of the controller and applies the PWM signal to the synchronous rectification switch .

Thus, the SRM driving apparatus according to the present invention can more effectively improve the conduction loss (power loss) by the conventional second diode D ₂ through the synchronous rectification switch S _SYNC based on the synchronous rectification method (Approximately 80% or more reduction), the power efficiency of the entire circuit can be improved, and the durability due to the reduction of heat generation can be ensured.

FIG. 1 is a block diagram showing a motor driving apparatus according to a temporary example of the present invention.
FIG. 2A is a diagram showing a circuit configuration of a conventional converter, and FIG. 2B is a diagram showing a switch operation procedure included in a converter in each phase of a conventional SRM.
FIG. 3A shows a circuit configuration of a converter according to a temporal example of the present invention, and FIG. 3B shows a degree of power loss according to a current magnitude of a converter according to the present invention.
4A to 4J are views showing a current loop according to a switching operation of a converter according to a temporal example of the present invention.
5 is a diagram showing currents and voltages of elements constituting a converter in each phase of SRM according to a temporal example of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The objectives, specific advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements are assigned the same number as much as possible even if they are displayed on different drawings. Also, the terms "one side,"" first, ""first,"" second, "and the like are used to distinguish one element from another, no. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of related arts which may unnecessarily obscure the gist of the present invention will be omitted.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a motor driving apparatus and a control method thereof according to the present invention will be described in detail with reference to the accompanying drawings, wherein the motor is a two-phase switched reluctance motor . Here, the SRM will be described with reference to the two-phase (A-phase, B-phase) SRM, but it also applies to a case having two or more phase lines.

FIG. 1 is a block diagram showing a driving apparatus for an SRM according to a temporal example of the present invention, and may include a rectifying unit 110, a converter 120, and a control unit 140.

The rectifying unit 110 rectifies the commercial voltage V _I of the power supply unit 100 to generate a DC voltage and smoothes the commercial voltage V _I to improve the power factor of the DC voltage, (Not shown) for rectifying the smoothed commercial voltage V _I and a bridge rectifier circuit (not shown) for rectifying the smoothed commercial voltage V _I.

The converter 120 applies the DC voltage to each phase of the SRM 130 through a switching operation and applies the DC voltage to each phase line of the SRM 130 through the switching operation S1 And S4), and a current circulating unit ( _SYNC , D) for circulating the current flowing through each phase line of the SRM 130 in a predetermined direction during the switching operation.

The switching units S1 to S4 include a first switch S1 connected in series to one of the phase lines of the SRM 140, a second switch S2 connected in series to the lower portion of one of the phase lines of the SRM 140, A third switch S3 connected in series to the upper portion of the other phase line of the SRM 140 and a fourth switch S4 connected in series below the phase line of the other one of the SRMs 140. [

The current circulating unit S _SYNC and D includes a diode D and a synchronous rectification switch _SYNC which are cross-connected to both ends of two phase-change lines A phase and B phase windings, An anode is connected to a contact point of one of the phase line (A-phase line) and the first switch S1 of the SRM 140 and the other phase line (B-phase line) S3 are connected to the cathode.

One end of the synchronous rectification switch S _SYNC is connected to the contact point of any one of the phase line A and the fourth switch S4 of the SRM 140, (B phase-phase line) and the first switch S1. Here, the synchronous rectification switch S _SYNC may be a metal-oxide semiconductor (MOSFET), but is not limited thereto.

The control unit 140 controls the switching operation of the converter 120 according to the driving state of the SRM 130 (position and speed of the rotor (not shown)). That is, the control unit 140 controls the switching operation of the switching unit and the current circulating unit of the converter 120 according to the driving state of the SRM 140, Line to be applied sequentially.

The controller 140 may include a PWM signal generating module 142 which may be an MCU (Micro Controller Unit) and generates a PWM signal to be applied to the first and second upper and lower switches S1 to S4 of the converter 120, And a controller 141 for generating a control signal for controlling the PWM signal generating module.

Furthermore, the control unit 140 controls the operation timing of the synchronous rectification switch S _{SYNC to be} synchronized with the operation timing of the switching units S1 to S4. That is, the control unit 140 controls the operation timing of the synchronous rectification switch S _{SYNC to be} synchronized with the operation timing of the third switch S3 and the fourth switch S4.

More specifically, the controller 141 synchronizes the turn-on timing of the synchronous rectification switch S _{SYNC with} the turn-on timing of the fourth switch S4, and turns on the third switch S3. And generates a control signal for synchronizing the timing of turn-off (OFF) of the synchronous rectification switch S _SYNC at the timing.

The PWM signal generation module 142 generates a PWM signal for controlling the ON and OFF operations of the synchronous rectification switch S _SYNC based on the control signal of the controller 141, To the synchronous rectification switch S _SYNC .

Hereinafter, the converter of the SRM according to the present invention will be described in more detail with reference to Figs. 2A to 3B.

FIG. 2A is a diagram showing a circuit configuration of a conventional converter, and FIG. 2B is a diagram showing a switch operation sequence included in a converter in each phase of a conventional SRM.

3A is a diagram showing a circuit configuration of a converter according to a temporal example of the present invention, and FIG. 3B is a diagram showing the degree of power loss according to the current magnitude of the converter according to the present invention.

2A, the conventional SRM converter 120 includes a pair of switches connected in series in the upper and lower two phase lines (not shown) of the two-phase SRM 130, (Including the first diode D ₁ and the second diode D ₂ which are cross-connected ₎ .

2B, the converter 120 of the conventional SRM is configured such that the first switch S1 and the fourth switch S4, the second switch S2 and the third switch S3 are 180 ° The first switch S2 and the third switch S3 are controlled to be turned on based on the encoder waveform to adjust the leading angle and the first switch S2 and the third switch S3 are turned on, (ON) timing of the first switch S1 and the fourth switch S4 to adjust the conduction angle.

However, in the conventional SRM converter 120, during the switching operation of the first to fourth switches S1 to S4, the power loss during the switching operation can be reduced through zero voltage switching (Zero Voltage Switching) , The power loss (P _{LOSS ( DIODE )} ) by the second diode (D ₂ ) can be _reduced as shown in the following equation (1) when the magnitude of the current I _F flowing through the second diode D ₂ is large. The overall power efficiency of the converter 120 is reduced and heat is generated. Here, V _F The For example, a forward voltage drop of the second diode D ₂ , depending on the nature of the diode (for example, V _F = 1 [v]).

[Equation 1]

For example, when the magnitude of the current flowing through the second diode D ₂ is 8 [A] and V _F The power loss (P _{LOSS ( DIODE )} ) by the second diode (D ₂ ) is 8 [W].

3A, the converter 120 according to one example of the present invention includes: 1) a first switch S1 and a second switch S2, which are serially connected in series to an A-phase winding; 2) comprises a vertical third switch (S3) and the fourth switch (S4), and a diode (D ₁₎ and the synchronous rectification switch (S _sYNC) that is cross-connected to both ends of said two-phase winding phase line in series with the windings And a more detailed driving method will be described later.

Accordingly, the converter 120 secures the overall power efficiency of the converter 120 through the synchronous rectification using the synchronous rectification switch S _SYNC instead of the second diode D ₂ , It is possible to prevent a malfunction or the like.

The power loss (P _{LOSS ( SYNC )} ) in the synchronous rectification switch ( _SYNC ) by the synchronous rectification method can be expressed by the following formula (2).

&Quot; (2) "

Here, R _ds denotes the internal resistance between the drain (d) and the source (s) of the MOS FET, and I _S = current flowing through the synchronous rectification switch S _SYNC .

For example, when the current I _S flowing through the synchronous rectification switch S _SYNC is 8 [A] and R _ds 10 is the power loss _{(P LOSS (SYNC))} in [mΩ] When the synchronous rectification switch (S _SYNC) is generated is 0.64 [W].

That is, in the SRM of the converter 120, a prior art as shown in Figure 3b, the second power loss due to the diode (D ₂₎ is the magnitude of the current (I _F) flows to the second diode (D ₂₎ (D graph).

However, the power loss due to the synchronous rectification switch S _SYNC does not increase in proportion to the magnitude of the current flowing in the synchronous current switch S _SYNC , as in the above-mentioned formula (2) (S graph).

Therefore, the driving apparatus of the SRM 130 according to the embodiment of the present invention can reduce the conduction loss (power loss) caused by the conventional second diode D ₂ through the synchronous rectification switch S _SYNC based on the synchronous rectification method ) Can be more effectively improved (about 80% or more can be reduced), the power efficiency of the entire circuit can be improved, and durability due to reduction of heat generation can be ensured.

Hereinafter, a method of controlling the SRM driving apparatus according to an embodiment of the present invention will be described in detail with reference to FIGS. 4A to 4F and FIG.

4A to 4J are views showing a current loop according to a switching operation of a converter according to a temporal example of the present invention. FIG. 5 is a graph showing current and voltage of elements constituting the converter in the SRM phase according to a temporal example of the present invention Fig.

A method of controlling an SRM according to an embodiment of the present invention includes a driving step of applying a DC voltage supplied from a power source unit 100 to a phase line of a SRM 130 through a switching operation, , And a phase change step of sequentially applying the DC voltage to another phase line of the SRM (130).

(1) The driving step includes 1) an energy transfer step of applying a voltage to any one of the phase line of the SRM 130 and 2) a first cycling current step of circulating the phase current flowing in the phase line in a predetermined direction .

(1) In the energy transferring step, a step of turning on a first switch connected in series to the upper part of one of the phase winding lines and a second switch connected in series to the lower part of one of the phase winding lines of the SRM are turned on .

More specifically, as shown in FIG. 4A, the energy transfer step (the first section T ₁ ~ T ₂ The first switch S1 and the second switch of the converter 120 are turned ON by the control signal of the control unit 140 in the first embodiment shown in Fig.

As the DC voltage V _dc is applied to the A phase coil line through the switching, the circulating current I _A1 flows through the first switch S1, the A phase coil, and the second switch S2.

Here, the current I _S1 Overcurrent I _S2 Has the same current magnitude, and the current I _S1 Overcurrent I _S2 Can be gradually reduced by the induced electromotive force at the A phase winding.

Here, the synchronization control switch voltage (V _SYNC) and a fourth switch (S4) voltage (V _S4) are respectively applied to the V _dc / 2 [V], in the third switching voltage and a diode (D) each V _dc / 2 [V] is maintained.

(Ii) the first circulating current step is a step (i) a first circulating current step of turning off the first switch S1 and keeping the second switch S2 turned on, (ii) A second circulating current step of turning on the second switch and turning on a fourth switch connected in series to the lower part of the other phase line of the SRM; and iii) And the third circulation current step of turning on the fourth switch.

Here, the first-second circulating current step (ii) is synchronized with the turn-on (ON) timing of the fourth switch S4 when the synchronous rectification switch S _SYNC is turned on. The third-third circulating current step (iii) is synchronized with the turn-on timing of the third switch when the synchronous rectification switch S _SYNC is turned on.

That is, as shown in FIG. 4B, the first circulating current phase (the second section T ₂ to T ₃ ) (see FIG. 5) is controlled by the controller 140, 1 switch S1 is turned OFF, and the second switch S2 is kept ON.

At this time, since the fourth switch voltage V _S4 and the synchronous rectification switch voltage V _SC converge to 0 V, the drive voltage V _dc is applied to the first switch voltage V _S1 .

Here, through the current loop composed of the inner diode of the A _phase winding line -> the second switch S2 -> the fourth switch S4, and the inner diode of the synchronous rectification switch S _SYNC , the circulation current I _{S_D} ) The flows, the current I _{S _D,} current I _S2 And current I _{S4 _D} They have the same size and orientation.

Next, as shown in FIG. 4C, the second circulating current phase (third interval T ₃ ~ T ₄₎ (see Fig. 5) in accordance with a control signal of the controller 140, the second switch (S2) of the converter 120 is turned on (ON), and the status is maintained, the fourth switch (S4) is turned on (ON).

At this time, the synchronous rectification switch S _SYNC can be turned on in synchronization with the timing at which the fourth switch S4 is turned on, and the DC voltage V _dc is maintained in the first switch S1 do.

Here, through the current loop composed of the A phase winding line-> the second switch S2 -> the fourth switch S4 -> the synchronous rectification switch S _SYNC , the circulation current I _S Flows. Here, the current I _S , Current I _S2 And current I _S4 The They have the same size and orientation.

Further, the circulating current ( I _S , I _S2 , I _S4 ) increases with time as the speed electromotive force according to the rotational speed of the SRM increases according to the following formula (3), whereby the slope of the cyclic current change decreases, and the cyclic current gradually decreases .

&Quot; (3) "

At this time, the fourth switch S4 is turned on in the second period T ₂ to T ₃ 5), the fourth switch voltage V _S4 converges to 0 [V] in the course of the circulating current I _{S4 _D} flowing through the internal diode of the fourth switch S 4, Turn on.

Thus, before the fourth switch voltage V _S4 converges to 0 [V], the fourth switch S4 is turned on, and the fourth switch voltage V _S4 and the fourth switch current I (ZVS) that can prevent a power loss (switching loss) that may occur in a switching process between the first and second switching devices ( _S4 , _S4 ).

4D, in accordance with the control signal of the control unit 140, the control signal of the converter 120 is output from the control unit 140 at 1-3 circulating current phases (fourth interval T ₄ to T ₅ ) The second switch S2 is turned OFF and the fourth switch S4 is kept ON.

Here, the synchronous rectification switch S _SYNC is maintained in the ON state, and the DC voltage V _dc is held in the first switch S 1.

Further, a current loop is formed, which is composed of the fourth switch S4, the synchronous rectification switch S _SYNC , the A phase current line, the diode D and the internal diode of the third switch S3, Through the loop, the circulating current I _S Flows. Here, the current I _S , Current I _{S3 _D} and current I _S4 The They have the same size and orientation.

At this time, as the negative voltage (-V _dc ) is applied to the A phase winding line, the circulating current I _S The As the driving voltage V _dc is applied to the B phase winding line, the magnitude of the current I _B1 gradually increases, but the circulating current I _S flowing in the A phase winding line gradually increases Smaller than.

(2) The phase-changing step includes: 1) an energy conversion step of controlling the switching operation to apply a voltage to another phase-change line of the SRM; and 2) a second phase- And a circulating current step.

1) turning on the third switch S3 connected in series to the upper portion of the other phase winding line and turning on the fourth switch S4 connected in series to the lower portion of the other phase winding; ).

That is, as shown in FIG. 4E, the energy conversion step (fifth period T ₅ ~ T ₆₎ (Fig. 5)), the response to the control signal of the controller 140, the fourth switch (S4) of the converter 120 is turned on (ON), and the status is maintained, the third switch (S3) is (ON).

At this time, the synchronous rectification switch S _SYNC is synchronized with the timing at which the third switch S3 is turned ON, and the voltage of the first switch S1 is set to the DC voltage V _dc do.

Here, the current loop composed of the internal diode -> the A phase current line -> the diode D of the synchronous rectification switch S _SYNC and the third switch S3 -> the B phase current line -> the fourth switch S4 A current loop is formed.

The third switch S3 and the fourth switch S4 are supplied with a current I _S3 corresponding to the difference between the current I _B2 flowing in the B phase winding line and the current flowing in the A phase winding, , I _S4 ) flows, and the circulating current I _A5 The And becomes smaller than the magnitude of the current I _B2 flowing in the B phase winding line.

Next, as shown in FIG. 4F, the sixth section T ₆ ~ T ₇₎ (see Fig. 5), the fourth switch (S4) and the remains is turned on (ON) state of the third switch (S3), a third switch (S3), B-phase winding and the fourth switch (S4) A current loop is formed.

Accordingly, the circulating current I _B3 flows through the current loop, and the current I _S3 , Current I _B3 And current I _S4 Have the same current magnitude, and the current I _B3 Can be gradually decreased by the speed electromotive force.

Here, the synchronous rectification switch voltage V _SYNC and the fourth switch S4 voltage V _S4 have V _dc / 2 [V], respectively, and the third switching voltage V _S3 and the diode D V _dc / 2 [V], respectively.

(2) the second circulating current step includes (i) a second-1 circulating-current step of turning off the fourth switch and keeping the third switch turned on, (ii) (2) a second circulating current step for turning on the first switch while keeping the first switch turned on and (iii) a third switch for turning on the fourth switch, And a second circulating current step for maintaining the second circulating current.

The second-2 circulating current step (step ii) is a step in which the timing of turning on of the synchronous rectification switch S _SYNC is synchronized with the timing of turning on of the first switch, Step iii) is synchronized with the timing of turning on (ON) timing of the synchronous rectification switch ().

In other words, Fig., The second-first step circulating current, as shown in 4g (see ⑦ interval (T ₇ ~ T ₈₎ (Fig. 5): 1) the switch maintains a state 3 (S3) is turned on (ON) The fourth switch S4 is turned OFF and the current loop composed of the internal diode of the first switch S1 and the internal diode of the third switch S3 to the synchronous rectification switch S _SYNC .

At this time, the circulation current I _B4 ) Flows, and the current I _S3 , Current I _B4 And current I _{SYNC _D} has the same amount of current, the current I _B4 Is gradually decreased by the speed electromotive force.

And, as shown in Figure 4h, the second-second cycle current step (⑧ sections (see T ₈ T ₉ ~) (Fig. 5) the third switch (S3) is turned on (ON), and the status is maintained, The first switch S1 is turned ON.

At this time, the synchronous rectification switch (S _SYNC) comprises a first switch (S1) is turned on (ON) is synchronized to the timing, and may be turned on (ON) is a fourth switch (S4) yen close to the drive voltage (V _dc) Lt; / RTI >

Here, a current loop is formed which is circulated to the third switch S3, the B phase current line, the synchronous rectification switch S _SYNC , and the first switch S1.

Next, as shown in Figure 4i, wherein the circulating current step 2-3 (⑨ sections (see T ₈ T ₉ ~) (Figure 5) comprises a first switch (S1) is turned on (ON) state is held and , And the third switch S3 is turned off.

At this time, the current composed of the current loop consisting of the internal diodes of the B phase current line-> synchronous rectification switch ( _SYNC ) -> the first switch S1 -> the second switch S2 and the A phase current line -> the diode D A loop is formed.

In this case, a positive driving voltage (+ V _dc ) is applied to both ends of the A phase winding line, the current flowing through the A phase winding phase line gradually increases, and a negative driving voltage (- V _dc ) is applied, and the current flowing through the B phase winding line gradually decreases.

And, as shown in Figure 4j, ⑩ interval (T ₉ ~ T ₁₀₎ (Fig. 5), the first switch (S1) is turned on (ON), and the status is maintained, the second switch (S2) is turned on (ON). At this time, the synchronous rectification switch S _SYNC is turned off in synchronization with the timing at which the second switch S2 is turned on.

Thereafter, the above-described energy transfer phase of the A phase and the first circulation current phase (the first to sixth intervals T ₁ ~ T ₇ (See FIG. 5) are performed in the same manner, and the rotor (not shown) of the SRM 130 rotates.

While the present invention has been described in detail with reference to the exemplary embodiments, it is to be understood that the present invention is not limited thereto and that the present invention is not limited thereto. It is evident that it can be modified or improved. That is, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: SRM drive device
100: commercial power supply 110: rectifying part
120: converter 130: SRM
140: controller 141: controller
142: PWM signal generating module

Claims (20)

A converter for applying a DC voltage supplied from the power supply unit to each phase line of a switched reluctance motor (hereinafter referred to as SRM) through a switching operation;
And a control unit for controlling a switching operation of the converter according to a driving state of the SRM.
The method according to claim 1,
Further comprising: a rectifying unit rectifying a commercial voltage (AC) supplied from the power supply unit to generate a DC voltage, and applying the DC voltage to the converter.
The method according to claim 1,
The converter
A switching unit for applying the DC voltage to each phase line of the SRM through the switching operation; And
And a current circulation unit for circulating currents flowing through the respective phase line of the SRM in a predetermined direction during the switching operation.
The method of claim 4,
The current circulating unit
And a diode and a synchronous rectification switch which are alternately connected to one end of each phase line of the SRM.
The method of claim 4,
The switching unit
A first switch connected in series to an upper portion of one of the phase lines of the SRM;
A second switch connected in series to a lower portion of any one of the phase lines of the SRM;
A third switch serially connected to the upper portion of the other phase line of the SRM;
And a fourth switch connected in series to the lower part of the other phase line of the SRM.
The method of claim 5,
The diode
An anode is connected to a contact point of one of the phase-change wires and the first switch of the SRM, a cathode is connected to another contact of the phase-change wire and the third switch of the SRM,
The synchronous rectification switch
Wherein one end of the SRM is connected to one of the phase line of the SRM and the contact of the fourth switch and the other end of the phase SRM is connected to the contact of the first switch.
The method of claim 6,
The synchronous rectification switch
A driving device of an SRM which is a metal-oxide semiconductor (MOSFET).
The method of claim 5,
The control unit
And the operation timing of the synchronous rectification switch is synchronized with the operation timing of the switching unit.
The method of claim 8,
The control unit
And the operation timing of the synchronous rectification switch is synchronized with the operation timing of the third switch and the fourth switch.
The method of claim 9,
The control unit
A controller for controlling a switching operation of the converter according to a driving state of the SRM;
And a PWM signal generation module for generating a PWM signal for controlling the switching operation of the converter based on a control signal applied from the controller and applying the generated PWM signal to the converter.
The method of claim 10,
The controller
(ON) timing of the synchronous rectification switch at a timing when the fourth switch is turned on, and synchronizing the timing of turning off (turning off) the synchronous rectification switch at a timing of turning on the third switch Lt; RTI ID = 0.0 >
The PWM signal generation module
Generates a PWM signal for controlling the ON and OFF operations of the synchronous rectification switch based on the control signal of the controller and applies the generated PWM signal to the synchronous rectification switch.
A driving step of applying, via a switching operation, a DC voltage supplied from a power supply unit to one of the phase winding lines of the SRM;
And a phase change step of controlling the switching operation to sequentially apply the direct current voltage to another phase line of the SRM.
The method of claim 12,
The driving step
An energy transfer step of applying a voltage to any one of the phase line of the SRM;
And a first circulating current step for circulating a phase current flowing through the phase winding line in a predetermined direction.
14. The method of claim 13,
The energy transfer step
Turning on a first switch connected in series to any one of the phase winding lines;
And turning on a second switch connected in series to a lower portion of any one of the phase line of the SRM.
15. The method of claim 14,
The circulating current step
A first circulating current step of turning off the first switch and keeping the second switch turned on;
A second circulating current step of turning on the second switch and turning on a fourth switch connected in series to the lower part of the other phase line of the SRM;
And a third circulating current step of turning off the second switch and keeping the fourth switch turned on.
16. The method of claim 15,
The first-second circulating current step
The turn-on (ON) timing of the synchronous rectification switch is synchronized with the turn-on (ON) timing of the fourth switch,
The first -3 circulating current stage
(ON) timing of the synchronous rectification switch is synchronized with a timing of turning on (ON) the third switch.
16. The method of claim 15,
The phase-
An energy conversion step of controlling the switching operation to apply a voltage to another phase line of the SRM,
And a second circulating current step for circulating the phase current flowing in the phase-shifting line in a predetermined direction.
18. The method of claim 17,
The energy conversion step
Turning on a third switch connected in series to the upper portion of the other phase winding line;
And turning on a fourth switch connected in series to a lower portion of the other phase winding line.
19. The method of claim 18,
The second circulating current step
A second-1 circulating current step of turning off the fourth switch and keeping the third switch turned on;
A second -2 circulating current step for turning on the third switch and turning on the first switch;
And a second-3rd circulating current step of turning off the third switch and keeping the fourth switch turned on.
The method of claim 19,
The second-2 circulating current stage
The ON timing of the synchronous rectification switch is synchronized with the ON timing of the first switch,
The second-3 circulating current stage
(ON) timing of the synchronous rectification switch is synchronized with a turn-on (ON) timing of the second switch.

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