CN108988311A - Power inverter and power conversion circuit - Google Patents
Power inverter and power conversion circuit Download PDFInfo
- Publication number
- CN108988311A CN108988311A CN201810564750.XA CN201810564750A CN108988311A CN 108988311 A CN108988311 A CN 108988311A CN 201810564750 A CN201810564750 A CN 201810564750A CN 108988311 A CN108988311 A CN 108988311A
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- switch element
- negative terminal
- circuit
- phase
- diode
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/008—Plural converter units for generating at two or more independent and non-parallel outputs, e.g. systems with plural point of load switching regulators
Abstract
First circuit and second circuit, which are connected in parallel, to be connected between the plus end of power supply and negative terminal.First circuit includes multiple first switching elements and the first freewheeling diode.Second circuit includes multiple second switch elements, the second freewheeling diode, protective switch element and protection diode.First freewheeling diode has rated current more higher than the second freewheeling diode.The summation for being connected in series in the forward voltage of multiple second freewheeling diodes between plus end and negative terminal and protection diode is greater than the summation for being connected in series in the forward voltage of multiple first freewheeling diodes between plus end and negative terminal.
Description
Technical field
This disclosure relates to a kind of power inverter and power conversion circuit.
Background technique
It has been known that there is following circuits.As described in Japanese patent publication the 4483751st, when battery Opposite direction connection, circuit
Contrary battery traffic organising circuit when preventing from normally connecting with battery.There are two field effect transistors for circuit tool
(FET), two FET are connected to the current supply line of connection power supply terminal and control circuit.When two FET are P-channel gold
When belonging to oxide semiconductor FET (MOSFET), the source electrode of two FET links together.The drain electrode of the first FET of two FET connects
It is connected to power supply terminal side.The drain electrode of the 2nd FET of two FET is connected to control circuit side.Therefore, two pole of parasitism of the first FET
The anode of pipe is located at power supply terminal side.The cathode of the parasitic diode of 2nd FET is located at the first side FET.
In above-mentioned Japanese patent publication the 4483751st circuit structure, when battery Opposite direction connection, to two
A parasitic diode of FET applies reverse biased.To prevent current direction control circuit during Opposite direction connection.
However, there are two FET for the tool of circuit described in Japanese patent publication the 4483751st.Therefore, physical size may become
Greatly.
Summary of the invention
Accordingly, it is desired to provide a kind of power inverter and power conversion circuit, turn in the power inverter and electric power
It changes in circuit, it is suppressed that the increase of damage and physical size as caused by the energization during Opposite direction connection.
First exemplary embodiment of the disclosure provides a kind of power inverter, which includes first
Circuit and second circuit, first circuit and second circuit are connected in parallel and are connected between the plus end of power supply and negative terminal.
First circuit includes multiple first branchs.Each first branch include: be connected in series in plus end and negative terminal it
Between multiple first switching elements；And it is connected in parallel to the first freewheeling diode of multiple first switching elements respectively.
Second circuit includes multiple second branchs and protection element.Each second branch includes: to be connected in series in plus end
Multiple second switch elements between negative terminal；And it is connected in parallel to the second afterflow two of multiple second switch elements respectively
Pole pipe.During Opposite direction connection, protection element protects multiple second branchs to lead to from power supply to plus end and negative terminal
Electricity.
Protection element includes protective switch element and protection diode, and the protective switch element is connected to described
Each second branch in multiple second branchs between plus end and the negative terminal, the protection diode parallel connection connect
It is connected to protective switch element, so that anode is in negative terminal side and cathode is in plus end side.
First freewheeling diode has the rated current higher than the second freewheeling diode.It is connected in series in plus end and negative terminal
The summation of multiple second freewheeling diodes between son and the forward voltage of protection diode be greater than be connected in series in plus end with
The summation of the forward voltage of multiple first freewheeling diodes between negative terminal.
Second exemplary embodiment of the disclosure provides a kind of power conversion circuit, which is connected in parallel
To in the circuit being connected between the plus end of power supply and negative terminal.The circuit includes multiple first branchs.Each first
Road includes: the multiple first switching elements being connected in series between the plus end and negative terminal；And it is connected in parallel to respectively
First freewheeling diode of multiple first switching elements.
Power conversion circuit includes multiple second branchs and protection element.Each second branch includes: to be connected in series in just
Multiple second switch elements between terminal and negative terminal；And it is connected in parallel to the of multiple second switch elements respectively
Two freewheeling diodes.During Opposite direction connection, the multiple second branchs of protection element protection to plus end and are born from power supply
The energization of terminal.
Protection element includes protective switch element and protection diode, and the protective switch element is connected in anode
Each second branch in multiple second branchs between son and negative terminal, the protection diode are connected in parallel to protection
Switch element, so that anode is in negative terminal side and cathode is in plus end side.
First freewheeling diode has the rated current higher than the second freewheeling diode.It is connected in series in plus end and negative terminal
The summation of multiple second freewheeling diodes between son and the forward voltage of protection diode be greater than be connected in series in plus end with
The summation of the forward voltage of multiple first freewheeling diodes between negative terminal.
As a result, electric current preferentially flows to the first freewheeling diode, rather than second is continuous during the Opposite direction connection of power supply
Flow diode and protection diode.Therefore, it is suppressed that the energization of second circuit (power conversion circuit) during Opposite direction connection.By
This, even if the energization of the power conversion circuit during Opposite direction connection is also suppressed in the case where single protection element.Therefore,
The physical size of power conversion circuit is inhibited to increase.As a result, it is suppressed that the physical size of power inverter increases.
As described above, the first freewheeling diode has rated current more higher than the second freewheeling diode.Therefore, though
It is powered during Opposite direction connection, also can inhibit the damage to the first circuit.
Appended drawing reference in bracket is provided to element cited within the scope of the claims.Appended drawing reference in bracket supplies
The corresponding relationship of simple instruction and the element according to embodiment, and be not necessarily indicative to according to the member described in embodiment itself
Part.The range of claims will not be unnecessarily reduced to the statement of the drawing reference numeral in bracket.
Detailed description of the invention
In the accompanying drawings:
Fig. 1 is the integrally-built block diagram of controller for motor according to first embodiment；
Fig. 2 is the integrally-built top view of rotor inverter；
Fig. 3 be Opposite direction connection during electric current block diagram；
Fig. 4 be Opposite direction connection during the magnitude of current curve graph；
Fig. 5 is the schematic circuit diagram for being illustrated to the magnitude of current during Opposite direction connection.
Specific embodiment
Embodiment below with reference to attached drawing, to the controller for motor that the power inverter of the disclosure is applied to vehicle
It is described.
(first embodiment)
Controller for motor 100 according to the present embodiment will be described referring to figs. 1 to Fig. 5.Controller for motor 100 is based on
From high-order electronic control unit (ECU；Be not shown) request instruction control motor 200.Controller for motor 100 and motor
200 constitute so-called integrated actuating electric generator (ISG).
Made of controller for motor 100 and motor 200 are integrated.That is, controller for motor 100 and the formation of motor 200
So-called electromechanics integrated morphology.
Motor 200 is connected to the crankshaft by its belt between the crankshaft of internal combustion engine.Internal combustion engine is installed on vehicle.Cause
This, motor 200 and crankshaft-synchronous rotation.When motor 200 is driven by controller for motor 100 to be rotated, which is transmitted to song
Axis.As a result, the crankshaft rotates.On the contrary, the rotation is transmitted to motor 200 when crankshaft is driven to rotate.As a result,
Motor 200 rotates.Motor 200 is driven and automatically rotated by controller for motor 100.As a result, the starting of internal combustion engine or
The auxiliary of vehicle driving is carried out.In addition, rotation of the motor 200 based on crankshaft and rotate.As a result, motor 200 generates
Electric power.Hereinafter, the brief description to motor 200 will be provided, then controller for motor 100 is described.
As shown in Figure 1, motor 200 includes rotor 201 and stator 202.In addition, motor 200 includes that axis and pulley (do not show
Out).Axis is rotationally arranged at the shell 300 of controller for motor 100.Expose to the outside of shell 300 on the top of axis.Pulley
The top end of axis is set.Above-mentioned belt is attached to pulley.As a result, the rotation of crankshaft is transmitted to pulley via belt.Phase
Instead, the rotation of axis is transmitted to crankshaft via belt.Motor 200 is equivalent to rotating electric machine.
The central part of axis is incorporated in shell 300.Rotor 201 is set to the central part of axis.In addition, stator 202
The periphery of rotor 201 is set.
Rotor 201 includes rotor coil 203.Rotor 201 further includes the fixed part that rotor coil 203 is fixed to axis
(not shown).Fixed part has cylindrical shape.The hollow portion of axis insertion fixed part is simultaneously fixed.Rotor coil 203
It is arranged in fixed part.Rotor coil 203 is electrically connected to the conducting wire (not shown) being arranged in axis.Conducting wire is electrically connected on axis
Slip ring.Slip ring forms ring-type around the axis of axis.Annular slip ring and brush contact.Brush is electrically connected to controller for motor 100.
Electric current from controller for motor 100 is supplied to brush.Electric current is supplied via brush, slip ring and conducting wire to rotor coil 203.
As a result, generating magnetic field in rotor coil 203.Rotor 201 is equivalent to wound rotor.
Stator 202 includes stator coil 204.Stator 202 further includes being provided with the stator core of stator coil 204 (not show
Out).Stator core has cylindrical shape.Rotor 201 is set to the hollow portion in stator core together with axis.Stator coil
204 include U phase stator coil 205, V phase stator coil 206 and W phase stator coil 207.Stator 202 is equivalent to wound stator.
U phase stator coil 205, V phase stator coil 206 and W phase stator coil 207 are each by the confluence between them
Item is integrally attached to controller for motor 100.Three-phase alternating current is supplied from controller for motor 100 to U phase stator coil
205, V phase stator coil 206 and W phase stator coil 207.To U phase stator coil 205, V phase stator coil 206 and W phase stator
Coil 207 supplies phase and offsets one from another the alternating currents of 120 degree of electrical angles.As a result, by U phase stator coil 205, V phase stator
Coil 206 and W phase stator coil 207 generate the three phase rotating field for rotating rotor 201.Three phase rotating field and rotor
Coil 203 intersects.
When each rotor coil 203 of current direction and stator coil 204, each coil generates magnetic field.As a result,
Rotation torque is generated in rotor coil 203.When three intersection of supply from controller for motor 100 to stator coil 204 as described above
When galvanic electricity, the direction for generating rotation torque continuously changes.Therefore, axis starts to rotate.Pulley also rotates together with the axis.Rotation warp
Crankshaft is transmitted to by belt.As a result, crankshaft also rotates.
On the contrary, when the burned driving of internal combustion engine, and when crankshaft automatically rotates, rotation is transmitted to cunning via belt
Wheel.In addition, rotation is transmitted to pulley via belt when crankshaft is rotated jointly by the rotation of wheel.As a result, axis with
Pulley rotates together.As a result, rotor coil 203 also rotates.From the magnetic field that rotor coil 203 emits and stator coil 204
Intersection.As a result, generating induced voltage in stator coil 204.Therefore, current direction stator coil 204.Electric current is via horse
Up to the supply of control device 100 to the battery 400 of vehicle.Battery 400 is equivalent to power supply.
Then, controller for motor 100 will be described.As shown in Figure 1, controller for motor 100 include for
The plus end 100a and negative terminal 100b that battery 400 is electrically connected.Plus end 100a is connected to the anode of battery 400.Negative terminal
Sub- 100b is connected to the cathode of battery 400.Smoothing capacity device 100c is arranged between plus end 100a and negative terminal 100b.
As shown in Figure 1, controller for motor 100 includes stator inverter 30 and rotor inverter 50.Stator inverter 30
And rotor inverter 50 is connected in parallel between plus end 100a and negative terminal 100b.In addition, controller for motor 100 includes
ISGECU 10 and current sensor 70.ISGECU 10 controls stator inverter 30 and rotor inverter 50.Current sensor 70
The electric current of stator inverter 30 and rotor inverter 50 is flowed through in detection.Stator inverter 30 is equivalent to the first circuit and circuit.Turn
Sub- inverter 50 is equivalent to second circuit and power conversion circuit.
ISGECU 10 is electrically connected to each stator inverter 30 and rotor inverter 50.ISGECU 10 can be via confluence
Item etc. is communicated with the high-order ECU of installation in the car.Request instruction from high-order ECU is input into ISGECU 10.
It is fixed to control that the generations such as request instruction of the ISGECU 10 based on input, the detection signal from current sensor 70 control signal
Sub- inverter 30 and rotor inverter 50.ISGECU 10 is output to stator inverter 30 and rotor inverter 50 for signal is controlled.
Therefore, the driving of stator inverter 30 and rotor inverter 50 is controlled.
Stator inverter 30 includes U phase branch 31, V phase branch 32 and W phase branch 33.U phase branch 31, V phase branch 32 and W
Phase branch 33 is connected in parallel between plus end 100a and negative terminal 100b.33 phase of U phase branch 31, V phase branch 32 and W phase branch
When in the first branch.
U phase branch 31, V phase branch 32 and W phase branch 33 respectively have high-side switch element and low side switch element.High side
Switch element and low side switch element are sequentially connected in series from plus end 100a to negative terminal 100b.Specifically, U phase branch 31
With U phase high-side switch element 34 and U phase low side switch element 35.V phase branch 32 has V phase high-side switch element 36 and V phase
Low side switch element 37.W phase branch 33 has W phase high-side switch element 38 and W phase low side switch element 39.Switch element is suitable
In first switching element.
The switch element for constituting stator inverter 30 is MOSFET.Therefore, switch element respectively has parasitic diode.
That is, U phase high-side switch element 34 has U phase high side diode 34a.U phase low side switch element 35 has U phase low side diodes
35a.V phase high-side switch element 36 has V phase high side diode 36a.V phase low side switch element 37 has V phase low side diodes
37a.W phase high-side switch element 38 has W phase high side diode 38a.W phase low side switch element 39 has W phase low side diodes
39a.The cathode of each parasitic diode is located at the side plus end 100a.The anode of each parasitic diode is located at negative terminal 100b
Side.Parasitic diode is equivalent to the first freewheeling diode.
As shown in Figure 1, the first end of U phase stator coil 205, the first end of V phase stator coil 206 and W phase stator coil
207 first end is connected to each other.As a result, U phase stator coil 205, V phase stator coil 206 and W phase stator coil 208 with
The mode of star-like connection connects.The second end of U phase stator coil 205 is connected to U phase high-side switch element 34 and U phase low side switch
Central point between element 35.The second end of V phase stator coil 206 is connected to V phase high-side switch element 36 and V phase low side switch
Central point between element 37.The second end of W phase stator coil 207 is connected to W phase high-side switch element 38 and W phase low side switch
Central point between element 39.
As above-mentioned electric connection structure as a result, for example, working as U phase high-side switch element 34,37 and of V phase low side switch element
When W phase low side switch element 39 is kept closed and the control signal from ISGECU 10, current direction stator coil
204.Specifically, electric current is from plus end 100a via U phase high-side switch element 34, U phase stator coil 205, V phase stator coil
206 and V phase low side switch element 37 flows to negative terminal 100b.Electric current from plus end 100a via U phase high-side switch element 34,
U phase stator coil 205, W phase stator coil 207 and W phase low side switch element 39 flow to negative terminal 100b.
When all switch elements of stator inverter 30 are in off-state, apply to parasitic diode reversed inclined
Pressure.Therefore, electric current will not flow to stator inverter 30.However, when 400 Opposite direction connection of battery to controller for motor 100,
That is, as shown in figure 3, when the anode of battery 400 is connected to negative terminal 100b, and when cathode is connected to plus end 100a, to posting
Raw diode applies forward bias.Therefore, as shown by solid arrows, even if switch element is in an off state, electric current can also flow
To stator inverter 30.Specifically, electric current is from negative terminal 100b via U phase low side diodes 35a and U phase high side diode
34a flows to plus end 100a.Electric current is flowed to from negative terminal 100b via V phase low side diodes 37a and V phase high side diode 36a
Plus end 100a.Electric current flows to plus end via W phase low side diodes 39a and W phase high side diode 38a from negative terminal 100b
100a.Constituent element is omitted in Fig. 3 suitably to be clearly shown electric current.
Whereby, when 400 Opposite direction connection of battery to controller for motor 100, plus end is flowed to from negative terminal 100b
The parasitic diode of the current direction stator inverter 30 of 100a.According to the present embodiment, module type power MOSFET, which is used as, to be constituted
The switch element of stator inverter 30.Therefore, the rated current of switch element and parasitic diode is high.Switch element and parasitism two
Pole pipe is designed to or even is able to bear the electric current to circulate during the Opposite direction connection of battery 200.Constituting stator inverter 30
Switch element in using there is so-called single side cooling system.
The switch element for constituting stator inverter 30 is made of silicon.Therefore, the forward direction electricity of the parasitic diode of switch element
Pressing Vf is about 0.6V.As shown in figure 4, the magnitude of current increases rapidly when applying the voltage for being equal to or more than 0.6V to parasitic diode
Add.
Rotor inverter 50 includes E phase branch 51 and F phase branch 52.E phase branch 51 and F phase branch 52 are connected in parallel just
Between terminal 100a and negative terminal 100b.Branch is equivalent to second branch.Rotor inverter 50 constitutes full-bridge circuit.Rotor inversion
Device 50 includes protection element 53.Protection element 53 is connected to E phase branch 51 and F between plus end 100a and negative terminal 100b
Phase branch 52.As shown in Fig. 2, E phase branch 51, F phase branch 52 and protection element 53 are mounted on printed circuit board 50a.
ISGECU 10 is also mounted on printed circuit board 50a.
Fig. 2 shows ISGECU 10 and E phase branch 51, F phase branch 52 and protection elements 53 to be installed along with printed circuit
Structure on the front plate 50a.However, for example, E phase branch 51, F phase branch 52 and protection element 53 may be mounted at printed circuit
On the front of plate 50a, and ISGECU 10 may be mounted on the back side of printed circuit board 50a.
E phase branch 51 has E phase high-side switch element 54 and E phase low side switch element 55.54 He of E phase high-side switch element
E phase low side switch element 55 is sequentially connected in series from plus end 100a to negative terminal 100b.There is F phase branch 52 F phase high side to open
Close element 56 and F phase low side switch element 57.F phase high-side switch element 56 and F phase low side switch element 57 are from plus end 100a
It is sequentially connected in series to negative terminal 100b.Switch element is equivalent to second switch element.
Protection element 53 has the protective switch element being arranged between plus end 100a and E phase high-side switch element 54
58.Protective switch element 58 is also positioned between plus end 100a and F phase high-side switch element 56.Whereby, protective switch element
58 are arranged to share between E phase branch 51 and F phase branch 52.
When electric current flows to rotor coil 203, protective switch element 58 is controlled by ISGECU 10 and is in closed state.
When opening ignition switch, ISGECU 10 determines whether battery 400 is normally connected to plus end 100a and negative terminal 100b.
When determining that battery 400 is normally connected to plus end 100a and negative terminal 100b, ISGECU 10 controls protective switch element 58
It is set to be in closed state always.
The above-mentioned switch element for constituting rotor inverter 50 is MOSFET.Therefore, each switch element all has parasitism two
Pole pipe.That is, E phase high-side switch element 54 has E phase high side diode 54a.E phase low side switch element 55 has E phase downside two
Pole pipe 55a.F phase high-side switch element 56 has F phase high side diode 56a.F phase low side switch element 57 has F phase downside two
Pole pipe 57a.Protective switch element 58 has protection diode 58a.The cathode of each parasitic diode is located at the side plus end 100a.
Anode is located at the side negative terminal 100b.The parasitic diode of E phase branch 51 and F phase branch 52 is equivalent to the second freewheeling diode.
Above-mentioned brush is connected to central point and F phase between E phase high-side switch element 54 and E phase low side switch element 55
Central point between high-side switch element 56 and F phase low side switch element 57.Brush is contacted with the slip ring of axis.Slip ring passes through conducting wire
It is electrically connected to rotor coil 203.Whereby, the central point between E phase high-side switch element 54 and E phase low side switch element 55 and
Central point between F phase high-side switch element 56 and F phase low side switch element 57 is respectively electrically connected to rotor coil 203.Specifically
For, as shown in Figure 1, the central point between E phase high-side switch element 54 and E phase low side switch element 55 is electrically connected to rotor line
The first end of circle 203.Central point between F phase high-side switch element 56 and F phase low side switch element 57 is electrically connected to rotor line
The second end of circle 203.
As above-mentioned connection structure as a result, for example, when protective switch element 58, E phase high-side switch element 54 are low with F phase
When side switch element 57 is held in closed state and the control signal from ISGECU 10, electric current is from rotor coil 203
First end flows to the second end of rotor coil 203.That is, electric current is from plus end 100a via protection switch element 58, E phase high side
Switch element 54, rotor coil 203 and F phase low side switch element 57 flow to negative terminal 100b.In addition, for example, being used in protection
When switch element 58, F phase high-side switch element 56 and E phase low side switch element 55 are held in closed state, electric current is from rotor line
The second end of circle 203 flows to the first end of rotor coil 203.That is, electric current from plus end 100a via protection switch element 58,
F phase high-side switch element 56, rotor coil 203 and E phase low side switch element 55 flow to negative terminal 100b.
When all switch elements of rotor inverter 50 are in off-state, apply to parasitic diode reversed inclined
Pressure.Therefore, electric current will not flow to rotor inverter 50.However, when 400 Opposite direction connection of battery to controller for motor 100,
Apply forward bias to parasitic diode.Therefore, current direction rotor inverter 50.However, due to as described below, suppression
The energization of rotor inverter 50 is made.The switch element for constituting rotor inverter 50 has the switch than composition stator inverter 30
The lower rated current of element.Rotor inverter 50 has than the smaller physical size of stator inverter 30.Rotor inverter 50
The difference of rated current between stator inverter 30 be the difference due to forming material, chip size, radiator structure etc. and
It generates.
Current sensor 70 detects the magnitude of current for flowing through stator coil 204 and rotor coil 203.More specifically, electric current
Sensor 70 includes shunt resistance, which is set to stator inverter 30 and rotor inverter 50.Current sensor 70
Including U phase shunt resistance 71, V phase shunt resistance 72, W phase shunt resistance 73, E phase shunt resistance 74 and F phase shunt resistance 75.
U phase shunt resistance 71 is arranged between U phase low side switch element 35 and negative terminal 100b.V phase shunt resistance 72 is set
It sets between V phase low side switch element 37 and negative terminal 100b.W phase shunt resistance 73 setting W phase low side switch element 39 with
Between negative terminal 100b.E phase shunt resistance 74 is arranged between E phase low side switch element 55 and negative terminal 100b.F phase shunts electricity
Resistance 75 is arranged between F phase low side switch element 57 and negative terminal 100b.
The resistance value of the storage shunt resistance of ISGECU 10.Voltage based on resistance value and shunt resistance both ends is come detection stream
To the magnitude of current of each low side switch element of each branch.Thus the electricity of stator coil 204 and rotor coil 203 is flowed through in estimation
Flow.Current sensor 70 is not limited to above-mentioned example.For example, it is also possible to be examined using based on the magnetic field generated by the circulation of electric current
Survey the structure of the magnitude of current.
Then, the current flowing during the Opposite direction connection of battery 400 will be described.With composition stator inverter
30 switch element is similar, and the switch element for constituting rotor inverter 50 is made of silicon.Therefore, as shown in figure 4, composition rotor is inverse
The forward voltage Vf for becoming the parasitic diode of the switch element of device 50 is also about 0.6V.
Fig. 5 shows representative structure element of the U phase branch 31 as stator inverter 30.V phase branch 32 and W phase branch 33
Characteristic it is identical as the characteristic of U phase branch 31.Therefore, the descriptions thereof are omitted.Fig. 5 shows 53 He of protection element in a similar way
Representative structure element of the E phase branch 51 as rotor inverter 50.The characteristic phase of the characteristic of F phase branch 52 and E phase branch 51
Together.Therefore, the descriptions thereof are omitted.
As shown in figure 5, U phase low side diodes 35a and U phase high side diode 34a is connected in series in U phase branch 31.Cause
This, the forward voltage summation of U phase branch 31 is about 1.2V.In consideration of it, in E phase branch 51, E phase low side diodes 55a, E phase
High side diode 54a and protection diode 58a is connected in series.Therefore, the summation of the forward voltage of E phase branch 51 is about
1.8V.Whereby, the quantity for the diode being connected in series in E phase branch 51 is greater than the diode being connected in series in U phase branch 31
Quantity.Therefore, the summation of the forward voltage of E phase branch 51 is bigger.This is also applied similarly to other branches, i.e., F phase branch 52,
V phase branch 32 and W phase branch 33.Therefore, each branch of rotor inverter 50 has each branch than stator inverter 30
The summation of bigger forward voltage.
As shown in figure 5, negative terminal 100b exists when 400 Opposite direction connection of battery is to plus end 100a and negative terminal 100b
Hot side and plus end 100a are in low potential side.In Fig. 5, symbol T indicates the current potential of negative terminal 100b.
During this Opposite direction connection, for example, when electric current IU shown in Fig. 4 flows to U phase branch 31, the voltage of about 0.9V
It is applied to each U phase low side diodes 35a and U phase high side diode 34a of U phase branch 31.Therefore, as shown in figure 5, negative terminal
Voltage between sub- 100b and plus end 100a is about 1.8V.The voltage of 1.8V is also exerted to protection diode 58a, E phase downside
Diode 55a and E phase high side diode 54a.In this case, the voltage of about 0.6V is applied to each protection diode
58a, E phase low side diodes 55a and E phase high side diode 54a.As described above, constituting posting for the switch element of rotor inverter
The forward voltage Vf of raw diode is about 0.6V.Therefore, as shown in figure 4, then flowing through the electric current IE of E phase branch 51 substantially
Zero.
It gives one example again, for example, when circulation has the electric current for being roughly twice above-mentioned electric current IU, the voltage quilt of about 1.0V
It is applied to each U phase low side diodes 35a and U phase high side diode 34a.Therefore, between negative terminal 100b and plus end 100a
Voltage be about 2.0V.In this case, the voltage of about 0.67V is applied to protection diode 58, E phase low side diodes
55a and E phase high side diode 54a.Therefore, the electric current IE for then flowing through E phase branch 51 is value close to zero again.Institute as above
It states, due to the I-V characteristic of diode and the difference of forward voltage summation, inhibits and turn during the Opposite direction connection of battery 400
Current flowing in sub- inverter 50.
Then, it will be retouched to according to the controller for motor 100 of the present embodiment and the function and effect of rotor inverter 50
It states.As noted previously, as protection element 53, the summation of the forward voltage of each branch of rotor inverter 50 is greater than stator inversion
The summation of the forward voltage of each branch of device 30.Therefore, during the Opposite direction connection of battery 400, electric current is initiatively flowed to
The diode of each branch of stator inverter 30, rather than flow to the diode of each branch of rotor inverter 50.It is tied
Fruit is, it is suppressed that the energization of each branch of rotor inverter 50 during Opposite direction connection.Whereby, even if in single protection member
In the case where part 53, the energization of the rotor inverter 50 during Opposite direction connection is also suppressed.Therefore, there are two protection elements with tool
Structure compare, it is suppressed that the physical size of rotor inverter 50 increases.Therefore, it is suppressed that the physics of controller for motor 100
Size increases.
As described above, the switch element of composition stator inverter 30 and the rated current of parasitic diode are higher.Switch member
Part and parasitic diode are designed to or even are able to bear the electric current during 400 Opposite direction connection of battery.Therefore, even if reversely connecting
It is powered during connecing, also inhibits the damage to stator inverter 30.
Protection element 53 is connected in series to share between E phase branch 51 and F phase branch 52.As a result, with E phase branch
Respectively the structure with protection element 53 is compared with F phase branch 52 on road 51, it is suppressed that the increase of number of components.In addition, it is suppressed that
The physical size of rotor inverter 50 increases.Therefore, it is suppressed that the increase of the physical size of controller for motor 100.
The switch element for constituting stator inverter 30 is installed on heat-sink unit 30a.As a result, for example, it is suppressed that by anti-
Temperature into stator inverter 30 caused by the energization during connection increases.Therefore, it is suppressed that the damage of stator inverter 30
Bad generation.
The foregoing describe preferred embodiment of the present disclosure.However, the disclosure is not limited to above-described embodiment.This is not being departed from
Various modifications can be carried out in the case where open spirit.
(other embodiments)
According to the present embodiment, gives motor 200 and be attached to showing for the crankshaft for being installed on the internal combustion engine of vehicle by belt
Example.It is also possible, however, to use motor 200 to be attached to the structure of crankshaft by transmission mechanism.
According to the present embodiment, gives protective switch element 58 and be located in plus end 100a and E phase high-side switch element 54
Between, and the example being also positioned between plus end 100a and F phase high-side switch element 56.It is also possible, however, to use protection
It is located between negative terminal 100b and E phase low side switch element 55 with switch element 58, and is also positioned on negative terminal 100a and F
Structure between phase low side switch element 57.
According to the present embodiment, the example that rotor inverter 50 is full-bridge circuit is given.However, rotor inverter 50 can be with
Constitute half-bridge circuit.
According to the present embodiment, giving and constituting the switch element of stator inverter 30 and rotor inverter 50 is MOSFET's
Example.However, the switch element for constituting stator inverter 30 and rotor inverter 50 is not limited to above-mentioned example.For example, can make
With insulated gate bipolar transistor (IGBT).In this case, additional freewheeling diode inverse parallel is connected to switch element.
According to the present embodiment, the showing using single side cooling system in the switch element for constituting stator inverter 30 is given
Example.However, being not limited to above-mentioned example for carrying out cooling system to the switch element for constituting stator inverter 30.For example, can
To use two-sided cooling system.The cooling system for having fluid coolant is utilized alternatively, it is also possible to use.
According to the present embodiment, the example that stator inverter 30 and rotor inverter 50 are made of silicon is given.However, example
Such as, formation material of the silicon carbide with band gap more broader than silicon as stator inverter 30 and rotor inverter 50 can be used
Material.As a result, it is possible to stablize operation at high temperature.
In addition, the forming material of rotor inverter 50 and stator inverter 30 can be different, as long as rotor inverter 50
The summation of the forward voltage of each branch is greater than the summation of the forward voltage of each branch of stator inverter 30.For example, rotor
Inverter 50 can be made of silicon carbide, and stator inverter 30 can be made of silicon.
In addition, in rotor inverter 50, the forming material of E phase branch 51 and F phase branch 52 and the shape of protection element 53
It can be different at material.For example, E phase branch 51 and F phase branch 52 can be made of silicon.Protection element 53 can be by silicon carbide system
At.
According to the present embodiment, giving the switch element for constituting rotor inverter 50 has than constituting stator inverter 30
The example of the lower rated current of switch element.However, for example, protective switch is first in the switch element of rotor inverter 50
The rated current of part 58 can be set as the rated current for being equal to the switch element for constituting stator inverter 30.In such case
Under, similar to the switch element of stator inverter 30, module type power MOSFET may be used as protective switch element 58.
Claims (14)
1. a kind of power inverter characterized by comprising
First circuit (30) and second circuit (50), first circuit (30) and the second circuit (50) company of being connected in parallel
It is connected between the plus end (100a) of power supply (400) and negative terminal (100b), wherein
First circuit includes multiple first branchs (31,32,33), and each first branch includes: multiple first switching elements
(34,35,36,37,38,39), multiple first switching elements are connected in series between the plus end and the negative terminal；
And first freewheeling diode (34a, 35a, 36a, 37a, 38a, 39a), first freewheeling diode respectively with it is multiple described
First switching element is connected in parallel,
The second circuit includes:
Multiple second branchs (51,52), each second branch include that multiple second switch elements (54,55,56,57) and second are continuous
It flows diode (54a, 55a, 56a, 57a), multiple second switch elements are connected in series in the plus end and the negative terminal
Between son, second freewheeling diode is connected in parallel to multiple second switch elements respectively；And
Protection element (53), during Opposite direction connection, the protection element protects multiple second branchs from power supply to institute
The energization of plus end and the negative terminal is stated,
The protection element includes protective switch element (58) and protection diode (58a), and the protective switch element series connection connects
The each second branch being connected in multiple second branchs between the plus end and the negative terminal, the protection two
Pole pipe is connected in parallel to the protective switch element, so that anode is in the negative terminal side and cathode is in the plus end side,
First freewheeling diode has rated current more higher than second freewheeling diode, and
Multiple second freewheeling diodes and the protection diode being connected in series between the plus end and negative terminal
The summation of forward voltage be greater than and be connected in series in multiple first afterflows two between the plus end and the negative terminal
The summation of the forward voltage of pole pipe.
2. power inverter according to claim 1, which is characterized in that
The protective switch element shares among multiple second branchs, and is arranged in plus end side and negative terminal side
On either side.
3. power inverter according to claim 1, which is characterized in that further include:
Printed circuit board (50a), the second circuit installation is on the printed circuit board；And
Heat-sink unit (30a), first circuit are installed on the heat-sink unit.
4. power inverter according to claim 2, which is characterized in that further include:
Printed circuit board (50a), the second circuit installation is on the printed circuit board；And
Heat-sink unit (30a), first circuit are installed on the heat-sink unit.
5. power inverter according to claim 3, which is characterized in that
First circuit is electrically connected to the wound stator (202) of rotating electric machine (200)；And
The second circuit is electrically connected to the wound rotor (201) of rotating electric machine.
6. power inverter according to claim 4, which is characterized in that
First circuit is electrically connected to the wound stator (202) of rotating electric machine (200)；And
The second circuit is electrically connected to the wound rotor (201) of rotating electric machine.
7. power inverter according to claim 5, which is characterized in that
The rotating electric machine is integrally connected to first circuit and the second circuit.
8. power inverter according to claim 6, which is characterized in that
The rotating electric machine is integrally connected to first circuit and the second circuit.
9. power inverter according to claim 7, which is characterized in that
The power inverter is installed on vehicle.
10. power inverter according to claim 8, which is characterized in that
The power inverter is installed on vehicle.
11. power inverter according to any one of claim 1 to 10, which is characterized in that
The first switching element has rated current more higher than the second switch element and the protective switch element.
12. power inverter according to any one of claim 1 to 10, which is characterized in that
The first switching element and the protective switch element have rated current more higher than the second switch element.
13. power inverter according to any one of claim 1 to 10, which is characterized in that
The first switching element is MOSFET, and first freewheeling diode is two pole of parasitism of the first switching element
Pipe；
The second switch element is MOSFET, and second freewheeling diode is two pole of parasitism of the second switch element
Pipe；And
The protective switch element is MOSFET, and the protection diode is the parasitic diode of the protective switch element.
14. a kind of power conversion circuit is connected in parallel to the plus end (100a) and negative terminal (100b) for being connected with power supply (400)
Between circuit (30), which is characterized in that the circuit includes multiple first branchs (31,32,33), each first branch packet
Include: multiple first switching elements (34,35,36,37,38,39), multiple first switching elements are connected in series in the anode
It is sub between the negative terminal；And first freewheeling diode (34a, 35a, 36a, 37a, 38a, 39a), first afterflow two
Pole pipe is connected in parallel with multiple first switching elements respectively, and the power conversion circuit includes:
Multiple second branchs (51,52), each second branch include that multiple second switch elements (54,55,56,57) and second are continuous
It flows diode (54a, 55a, 56a, 57a), multiple second switch elements are connected in series in the plus end and the negative terminal
Between son, second freewheeling diode is connected in parallel to multiple second switch elements respectively；And
Protection element (53), during Opposite direction connection, the protection element protects multiple second branchs from power supply to institute
The energization of plus end and the negative terminal is stated,
The protection element includes:
Protective switch element (58), the protective switch element are connected to more between the plus end and the negative terminal
Each second branch in a second branch；And
Protection diode (58a), the protection diode is connected in parallel to the protective switch element, so that anode is in negative terminal
Side and cathode in plus end side,
First freewheeling diode has rated current more higher than second freewheeling diode, and
Multiple second freewheeling diodes being connected in series between the plus end and the negative terminal and the protection two
It is continuous that the summation of the forward voltage of pole pipe is greater than multiple described first be connected in series between the plus end and the negative terminal
Flow the summation of the forward voltage of diode.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017111020A JP6551464B2 (en) | 2017-06-05 | 2017-06-05 | POWER CONVERTER AND POWER CONVERTER |
| JP2017-111020 | 2017-06-05 |
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| Publication Number | Publication Date |
|---|---|
| CN108988311A true CN108988311A (en) | 2018-12-11 |
| CN108988311B CN108988311B (en) | 2021-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810564750.XA Active CN108988311B (en) | 2017-06-05 | 2018-06-04 | Power conversion device and power conversion circuit |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6551464B2 (en) |
| CN (1) | CN108988311B (en) |
| DE (1) | DE102018113216A1 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105383551A (en) * | 2014-08-29 | 2016-03-09 | 株式会社电装 | Power source system |
-
2017
- 2017-06-05 JP JP2017111020A patent/JP6551464B2/en active Active
-
2018
- 2018-06-04 CN CN201810564750.XA patent/CN108988311B/en active Active
- 2018-06-04 DE DE102018113216.6A patent/DE102018113216A1/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105383551A (en) * | 2014-08-29 | 2016-03-09 | 株式会社电装 | Power source system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2018207680A (en) | 2018-12-27 |
| DE102018113216A1 (en) | 2018-12-06 |
| JP6551464B2 (en) | 2019-07-31 |
| CN108988311B (en) | 2021-09-17 |
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