CN111817556A - Control system and control method of power device - Google Patents
Control system and control method of power device Download PDFInfo
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- CN111817556A CN111817556A CN202010651699.3A CN202010651699A CN111817556A CN 111817556 A CN111817556 A CN 111817556A CN 202010651699 A CN202010651699 A CN 202010651699A CN 111817556 A CN111817556 A CN 111817556A
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- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
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- 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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a control system and a control method of a power device, which comprise the following steps: the device comprises a control unit, a battery voltage monitoring unit, a temperature monitoring unit, a voltage regulating unit and a switch unit; the switching unit comprises a plurality of selectable switching loops; the first input end of the control unit is electrically connected with the battery voltage monitoring unit and used for receiving the voltage value monitored by the battery voltage monitoring unit; the second input end of the control unit is electrically connected with the temperature detection unit and is used for receiving the temperature value monitored by the temperature monitoring unit; the first output end of the control unit is respectively and electrically connected with the plurality of switch loops and is used for controlling the first output end of the control unit to be conducted with the target loop; the target circuit is a switch circuit in the switch unit; the voltage regulating unit is electrically connected with the second output end of the control unit; the control unit is used for controlling the voltage regulating unit to output control voltage to the target loop according to the voltage value and the temperature value, optimizing the working state of the device and improving the working efficiency of the control system.
Description
Technical Field
The present invention relates to the field of circuit driving, and in particular, to a control system and a control method for a power device.
Background
The electric automobile is an automobile which takes a vehicle-mounted power supply as power and drives wheels to run by using a motor. Because the electric automobile adopts the vehicle-mounted battery as power, the influence of the discharged automobile exhaust on the environment is smaller than that of the traditional automobile, and the prospect of the electric automobile is widely seen.
In the prior art, the driving mode of a power device in an electric automobile is a fixed driving resistor and a fixed driving voltage, and after the driving resistor and the driving voltage of a driving circuit in the driving mode are fixed, parameters in the driving circuit cannot be adjusted, so that the switching loss of the power device cannot be optimized in the whole running process of the electric automobile. In addition, the method of optimizing the switching process is mostly adopted to reduce the loss of the power device in the driving circuit, namely, the switching unit conduction process is accelerated, for example, a large current is adopted to charge a gate-level capacitor of a switching tube, so that the rapid conduction of the power device is realized, or the switching unit conduction process adopts multi-level voltage control, namely, the gate-level capacitor is rapidly charged by adopting a high voltage in the first half of the switching unit conduction time, so that the rapid conduction of the rapid switching unit is realized. Although the switching speed of the power device is increased in the above manner, the driving circuit cannot realize real-time acquisition of the self state and the external environment state of the IGBT after the driving circuit is designed and formed, and cannot realize real-time optimization of the driving parameters according to the real-time working state of the IGBT.
Disclosure of Invention
The embodiment of the invention provides a control system and a control method of a power device, which are used for reducing the loss of the power device in a working state and improving the efficiency of the control system.
In a first aspect, an embodiment of the present invention provides a control system for a power device, including: the device comprises a control unit, a battery voltage monitoring unit, a temperature monitoring unit, a voltage regulating unit and a switch unit; the switching unit comprises a plurality of selectable switching loops;
the first input end of the control unit is electrically connected with the battery voltage monitoring unit and is used for receiving the voltage value of the power battery monitored by the battery voltage monitoring unit;
the second input end of the control unit is electrically connected with the temperature detection unit and is used for receiving the temperature value of the power device monitored by the temperature monitoring unit;
the first output end of the control unit is respectively and electrically connected with the switch loops and is used for controlling the conduction of the first output end of the control unit and a target loop according to the received voltage value and the temperature value; the target circuit is one of the switch circuits in the switch unit;
the voltage regulating unit is electrically connected with the second output end of the control unit; the control unit is used for controlling the voltage regulating unit to output control voltage to the target loop according to the voltage value and the temperature value.
Optionally, the driving circuit further comprises an isolation unit, wherein the isolation unit is electrically connected to the third input end of the control unit and is used for isolating high-low side voltages in the externally input driving signal.
Optionally, the switch circuit includes a switch resistor, and the resistance values of the switch resistors of the switch circuits are different.
Optionally, the target loop satisfies:
Vbat+L*di/dt<Vces
wherein, Vbat is the voltage value of the power battery monitored by the battery voltage monitoring unit, L is the inductance of the power circuit, Vces is the withstand voltage value of the power device at the temperature value monitored by the temperature monitoring unit, and di/dt is the off-current slope of the power device in the target circuit.
In a second aspect, an embodiment of the present invention further provides a method for controlling a power device, including: acquiring a voltage value of the power battery monitored by a battery voltage monitoring unit;
acquiring a temperature value of the power device monitored by a temperature monitoring unit;
controlling a first output end of the control unit to be conducted with a target loop according to the obtained voltage value and the obtained temperature value, and controlling a voltage regulating unit to output a control voltage to the target loop; wherein the target circuit is a switch circuit in the switch unit.
Optionally, the controlling the first output terminal of the control unit to be conducted with a target loop according to the obtained voltage value and the obtained temperature value, and controlling the voltage adjusting unit to output a control voltage to the target loop includes:
calculating the maximum current slope allowed by the power device according to the acquired voltage value and the acquired temperature value;
determining the target loop and the control voltage of the target loop according to the maximum current slope;
and controlling the first output end of the control unit to be conducted with the target loop, and controlling the voltage regulating unit to output a control voltage to the target loop.
Optionally, the determining the target loop and the control voltage of the target loop according to the maximum current slope includes:
determining the switching loss of each switching loop in the switching unit according to the maximum current slope;
calculating the conduction loss of the power device in the conduction period of a sinusoidal current;
and determining the target loop and the control voltage of the target loop according to the switching loss of each switching loop and the conduction loss of the power device.
Optionally, the switching loss of each switching loop satisfies:
E＝Eon+Eoff+Erec；
wherein Eon is the switch loop turn-on loss, Eoff is the switch loop turn-off loss, and Erec is the diode reverse recovery loss in the switching process.
Optionally, the conduction loss of the switching loop satisfies:
wherein the content of the first and second substances,
to express the power factor, m represents the modulation ratio, VCE0Representing the tube voltage drop, r, of the power deviceCEThe equivalent resistance of the power device during the conduction process is shown, and I represents the peak value of the sinusoidal current flowing through the power device.
Optionally, after determining the target loop and the control voltage of the target loop according to the maximum current slope, the method further includes:
and if the first output end of the control unit is conducted with the target loop and the power consumption of the power device is the minimum power consumption, controlling the conduction of the first output end of the control unit and the target loop, and controlling the voltage regulating unit to output the control voltage to the target loop.
According to the control system and the control method of the power device provided by the embodiment of the invention, the voltage value provided by the power battery is detected through the battery voltage monitoring unit, the temperature value of the power device is detected through the temperature monitoring unit, after the control unit receives the voltage value and the temperature value, the switched-on switch loop is selected according to the voltage value and the temperature value, and the voltage regulating unit is controlled to output the control voltage to the target loop, so that the switched-on switch loop and the control voltage of the power device are dynamically regulated by judging the current working state of the power device, the loss of the power device in the working state is reduced, and the efficiency of the control system is improved.
Drawings
Fig. 1 is a schematic structural diagram of a control system of a power device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a control system of another power device according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of a method for controlling a power device according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of another control method for a power device according to an embodiment of the present invention;
fig. 5 is a schematic flowchart of a control method for a power device according to another embodiment of the present invention;
fig. 6 is a schematic diagram of a simulation result of a control method of a power device according to an embodiment of the present invention;
fig. 7 is a schematic diagram illustrating simulation results of another control method for a power device according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a simulation result of another control method for a power device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a control system of a power device according to an embodiment of the present invention, and as shown in fig. 1, the control system 100 includes a control unit 10, a battery voltage monitoring unit 20, a temperature monitoring unit 30, a voltage adjusting unit 40, and a switching unit 50, and the switching unit 50 includes a plurality of optional switching loops 51. The first input end 11 of the control unit 10 is electrically connected to the battery voltage monitoring unit 20 and is configured to receive the voltage value of the power battery 60 monitored by the battery voltage monitoring unit 20, and the second input end 12 of the control unit 10 is electrically connected to the temperature monitoring unit 30 and is configured to receive the temperature value of the power device 70 monitored by the temperature monitoring unit 30. The first output end 13 of the control unit 10 is electrically connected to the plurality of switch loops 51, respectively, and is configured to control the first output end 13 of the control unit 10 to be conducted with a target loop according to the received voltage value and temperature value, where the target loop is one switch loop 51 of the switch units 50. The voltage regulating unit 40 is electrically connected to the second output terminal 14 of the control unit 10, and the control unit 10 is configured to control the voltage regulating unit 40 to output a control voltage to the target loop according to the voltage value and the temperature value.
As shown in fig. 1, the control system 100 includes a control unit 10, a battery voltage monitoring unit 20, a temperature monitoring unit 30, a voltage adjusting unit 30, and a switch unit 50, wherein the battery voltage monitoring unit 20 is configured to monitor a voltage value output by the power battery 60 and send the monitored voltage value to the control unit 10, the temperature monitoring unit 30 is configured to monitor a temperature value of the power device 70 and send the monitored temperature value to the control unit 10, when the control unit 10 receives the voltage value and the temperature value, respectively, the control unit 10 can select a conducting switch loop 51 according to a current working temperature of the power device 70 and the voltage value provided by the power battery 60 to the control system 100, and control the voltage adjusting unit 30 to output a control voltage to the conducting switch loop 51 according to the received temperature value and voltage value, and at the same time, dynamically adjust the conducting switch loop 51 and control voltage of the power device 70 by determining a current working state of the power device 70, thereby reducing the loss of the power device 70 in the working state and improving the efficiency of the control system. For example, when the temperature monitoring unit 20 monitors that the power device 70 is in a working environment with a lower temperature, at this time, since the voltage withstanding capability of the power device 70 is reduced compared with that of the power device 70 at a normal temperature, the control unit 10 controls the voltage regulating unit 30 to output a lower voltage and the switch loop 51 with a larger switch resistance to control the power device 70, so as to reduce the current variation during the switching process of the power device 70. And with the continuous work of the power device 70, the temperature monitoring unit 30 monitors that the temperature of the power device gradually rises, when the temperature monitoring unit 30 monitors that the temperature of the power device 70 is recovered to be above the normal temperature, the power device 70 is in the normal voltage-resistant range at the moment, and the power device 70 is controlled by selecting a smaller resistor and a higher voltage, so that the loss of the power device 70 is reduced.
According to the control system of the power device provided by the embodiment of the invention, the voltage value provided by the power battery is detected by the battery voltage monitoring unit, the temperature value of the power device is detected by the temperature monitoring unit, after the control unit receives the voltage value and the temperature value, the conducted switch loop is selected according to the voltage value and the temperature value, and the voltage regulating unit is controlled to output the control voltage to the target loop, so that the current working state of the power device is judged, the conducted switch loop and the control voltage of the power device are dynamically regulated, the loss of the power device in the working state is reduced, and the efficiency of the control system is improved.
Optionally, on the basis of the foregoing embodiment, fig. 2 is a schematic structural diagram of a control system of another power device according to an embodiment of the present invention, and as shown in fig. 2, the control system 100 further includes an isolation unit 80, where the isolation unit 80 is electrically connected to the third input terminal 15 of the control unit 10, and is used for isolating high-side voltage and low-side voltage in an externally input driving signal.
With reference to fig. 1 and fig. 2, when the control unit 10 directly receives the driving control signal output by the external driving unit 90, the isolation unit 80 is disposed at the third input terminal 15 of the control unit 10, the isolation unit 80 is used to isolate the high-side voltage and the low-side voltage of the driving control signal output by the driving unit, that is, isolate the weak-point signal and the high-voltage signal, and send the isolated driving control signal to the control unit 10, so as to implement the control of the control unit on the voltage adjustment unit 30 and the selection of the switching unit 50.
Optionally, with continued reference to fig. 1, the switching circuit 50 includes a switching resistor, and the switching resistors of the plurality of switching circuits 50 have different resistances.
Because the switching loss of the power device 70 is not only related to the current cut off in the turn-off process of the power device 70 and the voltage at two ends of the device itself, but also related to the switching speed of the power device 70 itself, and the switching speed of the power device is mainly influenced by the parameters of the control loop, the switching loss of the power device can be adjusted by adjusting the switching resistance of the switching loop 51 under certain working conditions. Therefore, by setting switch resistors with different resistance values in the plurality of switch circuits 51, after the control unit 10 receives the voltage value of the power battery 60 monitored by the battery voltage monitoring unit 20 and the temperature value of the power device 70 monitored by the temperature monitoring unit 30, one switch circuit 51 in the selection switch unit 50 is turned on, and the control voltage is output to the turned-on switch circuit 51 through the control voltage adjusting unit 30, on the premise that the control signal output by the control voltage adjusting unit 30 and the selected resistance value of the switch circuit 51 meet the requirement of the power device 70 to operate, the driving voltage is appropriately increased, and meanwhile, the equivalent on resistance of the control circuit of the power device 70 is reduced, so that the loss of the power device 70 is reduced, and the operating efficiency of the power device is improved.
Optionally, the target loop satisfies:
Vbat+L*di/dt<Vces (1)
wherein Vbat is the voltage value of the power battery monitored by the battery voltage monitoring unit 30, L is the inductance of the power circuit, Vces is the withstand voltage value of the power device 70 at the temperature value monitored by the temperature monitoring unit 30, and di/dt is the off-current slope of the power device 70 in the target circuit.
As can be seen from the formula (1), when the voltage value Vbat of the power battery 60 monitored by the battery voltage monitoring unit 20 is a determined value, the withstand voltage value Vces at the current temperature value of the power device 70 monitored by the temperature monitoring unit 30 is determined, and the inductance L of the power device loop is a determined value, at this time, the switched-on switching loop and the control voltage can be determined according to the off-current slope of the power device 70 in the target loop.
It should be noted that, since the slope of the off current of the power device obtained according to the formula (1) is an upper threshold, there are a plurality of selectable switching circuits 51 and control voltage values of the power device 70, and the embodiment of the present invention does not specifically limit the selected switching circuits 51 and control voltage, as long as the switching circuits and control voltages satisfying the formula (1) are both the protection scope of the present invention.
Optionally, on the basis of the foregoing embodiment, fig. 3 is a schematic flowchart of a control method of a power device according to an embodiment of the present invention, and as shown in fig. 3, the control method of the power device includes:
and S110, acquiring the voltage value of the power battery monitored by the battery voltage monitoring unit.
The power device needs an external power battery to provide voltage during working, the voltage value provided by the external power battery is obtained, and the switch resistance of the switch loop conducted by the power device is selected according to the voltage value provided by the external power battery, so that the phenomenon that the power device works in a working state with large loss or the voltage value provided by the power battery is large due to overlarge resistance value of the switch loop conducted by the power device, and the phenomenon that the surge breaks down the device due to overhigh slope of the turn-off current of the power device due to undersize resistance value of the switch loop conducted by the power device is avoided.
And S120, acquiring a temperature value of the power device monitored by the temperature monitoring unit.
Because the working efficiency and the conduction loss of the power device are related to the environment of the power device, when the power device is in a working environment with a lower temperature, the voltage withstanding capability of the power device is weaker than that of the working environment with a normal temperature, therefore, in the calculation process of the conduction loss of the power device, the temperature of the working environment of the current power device needs to be obtained, and then the switching loop which needs to be selected to be conducted is determined according to the temperature value of the environment of the power device.
S130, conducting the first output end of the control unit with a target loop according to the obtained voltage value and the obtained temperature value, and controlling the voltage regulation unit to output a control voltage to the target loop, wherein the target loop is one of the switch units.
When the temperature monitoring unit monitors the temperature value of the current power device and the voltage value of the power battery monitored by the battery voltage monitoring unit, the control unit controls the switch loop conducted by the control unit according to the acquired voltage value and the acquired temperature value, and controls the voltage adjusting unit to output control voltage to the conducted switch loop.
According to the control method of the power device provided by the embodiment of the invention, the first output end of the control unit is controlled to be conducted with the target loop according to the acquired voltage value of the power battery monitored by the battery voltage monitoring unit and the acquired temperature value of the power device monitored by the temperature monitoring unit, and the voltage regulating unit is controlled to output the control voltage to the target loop. The current working state of the power device, namely the external voltage provided by the power battery and the current working temperature of the power device, is obtained, and the switched loop and the control voltage which are conducted by the power device are selected, so that the loss of the power device in the working state is reduced, and the efficiency of a control system is improved.
Optionally, on the basis of the foregoing embodiment, fig. 4 is a schematic flowchart of a control method of another power device provided in the embodiment of the present invention, and as shown in fig. 4, controlling the first output terminal of the control unit to be conducted with a target loop according to the obtained voltage value and temperature value, and controlling the voltage regulating unit to output the control voltage to the target loop, where the target loop is a switch loop in the switch unit, and includes:
and S210, calculating the maximum current slope allowed by the power device according to the acquired voltage value and temperature value.
In the process of switching on and switching off the power device, the increase of the current change rate is beneficial to reducing the switching loss. Generally, power devices can achieve very fast turn-on speeds. In practical application, however, the turn-on speed is limited only by the commutation turn-off of the freewheeling diode, the reverse recovery peak current of the diode increases with the increase of the switching speed of the power device, the tail of the reverse recovery current of the diode also increases, and during the period, the diode bears almost the whole direct current bus voltage, which may cause the avalanche breakdown of the diode below the rated voltage. This is due to the strong electric field in the semiconductor, the high concentration of carriers and their high rate of change, which can damage the semiconductor if the diode does not have sufficient dynamic robustness and the commutation rate is too fast. Therefore, the phenomenon of damage to the power device is avoided by acquiring the maximum current slope allowed by the calculation of the power device.
The method for obtaining the maximum current slope allowed by the power device is known by formula (1), after the voltage value and the temperature value are obtained, the voltage value of the power battery monitored by the battery voltage monitoring unit is a determined value, the inductance of the power device is a determined value, the temperature value monitored by the power device in the temperature monitoring unit is a determined value, and the maximum current slope di/dt of the power device in the target loop can be obtained by solving the formula Vbat + L di/dt < Vces.
And S220, determining a target loop and a control voltage of the target loop according to the maximum current slope.
Because the current slope di/dt solved by the formula (1) is a value range, the control voltage of the target loop and the control voltage of the target loop can be determined according to the maximum current slope allowed by the power device by selecting the maximum value of the current slope di/dt, namely the control voltage of the target loop and the control voltage of the target loop are selected in advance under the condition of ensuring the normal work of the power device.
And S230, controlling the first output end of the control unit to be conducted with the target loop, and controlling the voltage regulating unit to output the control voltage to the target loop.
And after the target loop is determined, the first output end of the control unit is conducted with the target loop, and the control voltage regulation output unit is controlled to output the control voltage to the target loop.
The control voltages of the target circuit and the target circuit determined according to the maximum current slope may be one circuit or may be a plurality of circuits, and the control voltages of different target conduction circuits are different.
Optionally, on the basis of the foregoing embodiment, fig. 5 is a schematic flowchart of a control method of a power device according to another embodiment of the present invention, and as shown in fig. 5, determining a target loop and a control voltage of the target loop according to a maximum current slope includes:
and S310, determining the switching loss of each switching loop in the switching unit according to the maximum current slope.
The switching loss of each switching loop satisfies:
E＝Eon+Eoff+Erec (2)
wherein Eon is the switch loop turn-on loss, Eoff is the switch loop turn-off loss, and Erec is the diode reverse recovery loss in the switching process.
As shown in fig. 6, the switching loop opening loss Eon and the switching loop closing loss Eoff are positively correlated with the resistance of the switching loop, that is, the switching loop opening loss Eon and the switching loop closing loss Eoff increase with the increase of the switching resistance. As shown in fig. 7, the diode reverse recovery loss Erec of the switching loop during switching is inversely related to the resistance of the switching loop, i.e., the diode reverse recovery loss Erec of the switching loop during switching decreases as the switching resistance increases. However, since the switching loop opening loss Eon and the switching loop closing loss Eoff account for the most part of the whole switching loss, the change of the whole switching loss still increases with the increase of the switching resistance and decreases with the decrease of the switching resistance.
And S320, calculating the conduction loss of the power device in the conduction period of a sinusoidal current.
The conduction loss of the switch loop meets the following requirements:
wherein the content of the first and second substances,
representing power factor, m modulation ratio, VCE0Representing the tube voltage drop, r, of the power deviceCEThe equivalent resistance of the power device during the conduction process is shown, and I represents the peak value of the sinusoidal current flowing through the power device.
From the equation (3) and fig. 8, the switching loss power of the switching loop and the equivalent resistance r of the device during the conducting process can be knownCEIn this case, the switching losses of the switching circuit can be determined as a function of the selected switched-on switching circuit.
And S330, determining a target loop and a control voltage of the target loop according to the switching loss of each switching loop and the conduction loss of the power device.
Optionally, with continuing reference to fig. 5, after determining the target loop and the control voltage of the target loop according to the maximum current slope, the method further includes:
s240, if the first output end of the control unit is conducted with the target loop and the power consumption of the power device is the minimum power consumption, conducting the first output end of the control unit with the target loop, and controlling the voltage regulating unit to output the control voltage to the target loop.
And selecting the optimal control voltage of the switch loop through the switching loss and the conduction loss of each switch loop in the switch unit, ensuring that the power consumption of the power device is the minimum power consumption, controlling the conduction of the first output end of the control unit and the target loop at the moment, and controlling the voltage regulation unit to output the control voltage to the target loop.
It should be noted that the power device in the control system and the control method of the driving circuit according to the embodiment of the present invention may be an Insulated Gate Bipolar Transistor (IGBT), a field effect Transistor (MOSFET), a power Transistor (BJT), or the like, and the embodiment of the present invention does not specifically limit the type of the power device.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A control system for a power device, comprising: the device comprises a control unit, a battery voltage monitoring unit, a temperature monitoring unit, a voltage regulating unit and a switch unit; the switching unit comprises a plurality of selectable switching loops;
the first input end of the control unit is electrically connected with the battery voltage monitoring unit and is used for receiving the voltage value of the power battery monitored by the battery voltage monitoring unit;
the second input end of the control unit is electrically connected with the temperature monitoring unit and is used for receiving the temperature value of the power device monitored by the temperature monitoring unit;
the first output end of the control unit is respectively and electrically connected with the switch loops and is used for controlling the conduction of the first output end of the control unit and a target loop according to the received voltage value and the temperature value; the target circuit is one of the switch circuits in the switch unit;
the voltage regulating unit is electrically connected with the second output end of the control unit; the control unit is used for controlling the voltage regulating unit to output control voltage to the target loop according to the voltage value and the temperature value.
2. The control system of the power device according to claim 1, further comprising an isolation unit electrically connected to the third input terminal of the control unit for isolating the high-low side voltage of the externally input driving signal.
3. The control system of the power device according to claim 1, wherein the switching loop includes a switching resistor, and the switching resistors of the plurality of switching loops have different resistance values.
4. The control system of a power device according to claim 1, wherein the target loop satisfies:
Vbat+L*di/dt<Vces
wherein, Vbat is the voltage value of the power battery monitored by the battery voltage monitoring unit, L is the inductance of the power circuit, Vces is the withstand voltage value of the power device at the temperature value monitored by the temperature monitoring unit, and di/dt is the off-current slope of the power device in the target circuit.
5. A method for controlling a power device, comprising:
acquiring a voltage value of the power battery monitored by a battery voltage monitoring unit;
acquiring a temperature value of the power device monitored by a temperature monitoring unit;
controlling a first output end of the control unit to be conducted with a target loop according to the obtained voltage value and the obtained temperature value, and controlling a voltage regulating unit to output a control voltage to the target loop; wherein the target circuit is a switch circuit in the switch unit.
6. The method for controlling the power device according to claim 5, wherein the controlling the first output terminal of the control unit to conduct with a target loop according to the obtained voltage value and the obtained temperature value and controlling the voltage regulating unit to output the control voltage to the target loop comprises:
calculating the maximum current slope allowed by the power device according to the acquired voltage value and the acquired temperature value;
determining the target loop and the control voltage of the target loop according to the maximum current slope;
and controlling the first output end of the control unit to be conducted with the target loop, and controlling the voltage regulating unit to output a control voltage to the target loop.
7. The method of claim 6, wherein the determining the target loop and the control voltage of the target loop according to the maximum current slope comprises:
determining the switching loss of each switching loop in the switching unit according to the maximum current slope;
calculating the conduction loss of the power device in the conduction period of a sinusoidal current;
and determining the target loop and the control voltage of the target loop according to the switching loss of each switching loop and the conduction loss of the power device.
8. The method according to claim 7, wherein the switching loss of each of the switching loops satisfies:
E＝Eon+Eoff+Erec；
wherein Eon is the switch loop turn-on loss, Eoff is the switch loop turn-off loss, and Erec is the reverse recovery loss of the diode in the switching process.
9. The method for controlling a power device according to claim 7, wherein the conduction loss of the switching loop satisfies:
wherein cos (phi) represents a power factor,m represents a modulation ratio, VCE0Representing the tube voltage drop, r, of the power deviceCEThe equivalent resistance of the power device during the conduction process is shown, and I represents the peak value of the sinusoidal current flowing through the power device.
10. The method of claim 7, further comprising, after determining the target loop and the control voltage of the target loop according to the maximum current slope:
and if the first output end of the control unit is conducted with the target loop and the power consumption of the power device is the minimum power consumption, controlling the conduction of the first output end of the control unit and the target loop, and controlling the voltage regulating unit to output the control voltage to the target loop.
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