CN113794394A - Controller and control circuit - Google Patents

Controller and control circuit Download PDF

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Publication number
CN113794394A
CN113794394A CN202110924138.0A CN202110924138A CN113794394A CN 113794394 A CN113794394 A CN 113794394A CN 202110924138 A CN202110924138 A CN 202110924138A CN 113794394 A CN113794394 A CN 113794394A
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China
Prior art keywords
module
signal
sampling
protection signal
power line
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Granted
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CN202110924138.0A
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Chinese (zh)
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CN113794394B (en
Inventor
王小洪
钟亮
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Hangzhou Leaderway Electronics Co ltd
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Hangzhou Leaderway Electronics Co ltd
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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
    • 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
    • H02M7/53871—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 with automatic control of output voltage or current
    • 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
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply
    • H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
    • H02P29/027—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being an over-current
    • 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
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply
    • H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
    • H02P29/028—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the motor continuing operation despite the fault condition, e.g. eliminating, compensating for or remedying the fault
    • 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
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply
    • H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The application provides a controller and a control circuit. A first sampling module and a second sampling module of the controller respectively acquire a first sampling signal and a second sampling signal from a first power line and a second power line; the first comparison module obtains a first protection signal by comparing the first sampling signal with a first reference signal representing the maximum current value which can be borne by the first power line, the second comparison module obtains a second protection signal by comparing the second sampling signal with a second reference signal representing the maximum current value which can be borne by the second power line, namely, each sampling signal is compared with the corresponding reference signal to judge whether overcurrent occurs or not and the corresponding protection signal is output when the overcurrent occurs; the inversion unit reduces the output current according to the first protection signal and/or the second protection signal, namely, the inversion unit reduces the output current when the inversion unit generates overcurrent; therefore, the controller provided by the application can perform overcurrent protection on the switching tube in the inverter unit.

Description

Controller and control circuit
Technical Field
The invention relates to the technical field of motor control, in particular to a protection-related controller and a protection-related control circuit.
Background
In motor control, an inverter unit is often included; in the inverter unit, if the current flowing through the inverter unit is too large, the inverter unit, especially the switching tube in the inverter unit, may be damaged, and therefore, the overcurrent protection of the inverter unit is an essential power protection. Therefore, how to perform overcurrent protection on the switching tube in the inverter unit is one of the problems to be solved urgently.
Disclosure of Invention
In view of this, the present invention provides a controller and a control circuit for performing an overcurrent protection on a switching tube in an inverter unit.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
one aspect of the present application provides a controller, including a first power line, a second power line, and an inverter unit, where a high-potential end on a dc side of the inverter unit is electrically connected to the first power line, and a low-potential end on the dc side of the inverter unit is electrically connected to the second power line; the controller further includes: the device comprises a first sampling module, a first comparison module, a second sampling module and a second comparison module; wherein:
the first sampling module is electrically connected with the first power line to acquire a first sampling signal; the first sampling signal is used for representing the current of the first power line; the output end of the first sampling module is electrically connected with the input end of the first comparing module; the first comparison module compares the first sampling signal with a first reference signal representing the maximum current value which can be borne by the first power line to obtain a first protection signal;
the second sampling module is electrically connected with the second power line to acquire a second sampling signal; the second sampling signal represents the current of the second power line; the output end of the second sampling module is electrically connected with the input end of the second comparison module; the second comparison module compares the second sampling signal with a second reference signal representing the maximum current value which can be borne by the second power line to obtain a second protection signal;
the output ends of the first comparison module and the second comparison module are electrically connected with the inversion unit, the inversion unit receives the first protection signal and/or the second protection signal, and the inversion unit reduces self output current according to the first protection signal and/or the second protection signal.
Optionally, the method further includes: a protection signal processing module; wherein:
the first input end of the protection signal processing module is electrically connected with the output end of the first comparison module; the second input end of the protection signal processing module is electrically connected with the output end of the second comparison module; the protection signal processing module generates a third protection signal according to the first protection signal and/or the second protection signal;
the output end of the protection signal processing module is electrically connected with the inversion unit and outputs the third protection signal to the inversion unit; the inversion unit reduces output current according to the third protection signal;
the maximum current value that the second power line characterized by the second reference signal can bear is smaller than the maximum current value that the first power line characterized by the first reference signal can bear.
Optionally, the protection signal processing module includes: a first impedance branch and a second impedance branch; wherein:
one end of the first impedance branch is used as a first input end of the protection signal processing module, and one end of the second impedance branch is used as a second input end of the protection signal processing module;
the other end of the first impedance branch circuit is connected with the other end of the second impedance branch circuit, and a connection point is used as an output end of the protection signal processing module.
Optionally, the first sampling module includes: a first sampling resistor and a differential circuit; wherein:
the first sampling resistor is connected in series with the first power line;
two input ends of the differential circuit are respectively connected to two ends of the first sampling resistor, and an output end of the differential circuit is used as an output end of the first sampling module.
Optionally, the differential circuit comprises a high side current monitor; the high side current monitor comprises: the circuit comprises a transconductance amplifier, a conversion switching tube, a first resistor, a second resistor and a third resistor; wherein:
two input ends of the transconductance amplifier are respectively connected to two ends of the first sampling resistor through the second resistor and the third resistor;
the output end of the transconductance amplifier is connected with the control end of the conversion switch tube, the input end of the conversion switch tube is connected with the low potential end of the first sampling resistor, and the output end of the conversion switch tube is grounded through the first resistor;
the high potential end of the first resistor serves as an output end of the differential circuit.
Optionally, the second sampling module includes: a second sampling resistor; wherein:
the second sampling resistor is connected in series with the second power line;
and the high potential end of the second sampling resistor is used as the output end of the second sampling module.
Optionally, the inverting unit includes: the system comprises an inverter bridge, a driving module and a control module; wherein:
the output end of the control module is electrically connected with the input end of the driving module and sends a control signal to the driving module; the driving module generates a driving signal according to the control signal and sends the driving signal to a control end of the inverter bridge;
the third protection signal is output to the control module, the control module presets a third reference signal, and when the third protection signal is greater than the third reference signal, the control module stops outputting the control signal or outputs the control signal for reducing the output current of the inverter bridge;
or the third protection signal is output to the driving module, and the driving module pulls the control signal high or low according to the third protection signal.
Optionally, the inverting unit includes: the system comprises an inverter bridge, a driving module, a buffering module and a control module;
the output end of the control module is electrically connected with the buffer module, a control signal is sent to the drive module through the buffer module, and the drive module generates a drive signal according to the control signal and sends the drive signal to the control end of the inverter bridge; the buffer module is provided with a protection control circuit, the third protection signal is output to the protection control circuit, and the protection control circuit pulls the control signal low or high according to the third protection signal;
or the third protection signal is output to the driving module, and the driving module pulls the control signal high or low according to the third protection signal.
The application provides a control circuit which comprises a first power line, a second power line and an inversion unit, wherein a direct-current side high-potential end of the inversion unit is electrically connected with the first power line, and a direct-current side low-potential end of the inversion unit is electrically connected with the second power line; characterized in that the control circuit further comprises: the device comprises a first sampling module, a first comparison module, a second sampling module and a second comparison module; wherein:
the first sampling module is electrically connected with the first power line to acquire a first sampling signal; the first sampling signal is used for representing the current of the first power line; the output end of the first sampling module is electrically connected with the input end of the first comparing module; the first comparison module compares the first sampling signal with a first reference signal representing the maximum current value which can be borne by the first power line to obtain a first protection signal;
the second sampling module is electrically connected with the second power line to acquire a second sampling signal; the second sampling signal represents the current of the second power line; the output end of the second sampling module is electrically connected with the input end of the second comparison module; the second comparison module compares the second sampling signal with a second reference signal representing the maximum current value which can be borne by the second power line to obtain a second protection signal;
the output ends of the first comparison module and the second comparison module are electrically connected with the inversion unit, the inversion unit receives the first protection signal and/or the second protection signal, and the inversion unit reduces self output current according to the first protection signal and/or the second protection signal.
Optionally, the method further includes: a protection signal processing module; wherein:
the first input end of the protection signal processing module is electrically connected with the output end of the first comparison module; the second input end of the protection signal processing module is electrically connected with the output end of the second comparison module; the protection signal processing module generates a third protection signal according to the first protection signal and/or the second protection signal;
the output end of the protection signal processing module is electrically connected with the inversion unit and outputs the third protection signal to the inversion unit; and the inversion unit reduces the output current according to the third protection signal.
According to the technical scheme, the application provides the controller. In the controller, a first sampling module and a second sampling module respectively acquire a first sampling signal and a second sampling signal from a first power line and a second power line, namely, the currents of loops where the first power line and the second power line are located are respectively sampled; the first comparison module obtains a first protection signal by comparing the first sampling signal with a first reference signal representing the maximum current value that the first power line can bear, and the second comparison module obtains a second protection signal by comparing the second sampling signal with a second reference signal representing the maximum current value that the second power line can bear, namely: judging whether a loop in which the first power line or the second power line is positioned has overcurrent or not by comparing each sampling signal with the corresponding reference signal, and outputting a corresponding protection signal when the overcurrent occurs; the inversion unit reduces the output current according to the first protection signal and/or the second protection signal, namely: when the inversion unit generates overcurrent, the output current of the inversion unit is reduced; therefore, the controller provided by the application can perform overcurrent protection on the switching tube in the inverter unit, so that the power safety of the inverter unit is improved.
The application also provides a control circuit, which is the same as the topological structure of the controller, so that the control circuit provided by the application can also perform overcurrent protection on the switch tube in the inverter unit and improve the power safety of the inverter unit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1-8 are schematic diagrams of eight structures of a dual over-current protection circuit according to an embodiment of the present disclosure;
fig. 9 and fig. 10 are schematic structural diagrams of two inversion units provided in the embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In this application, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In order to perform overcurrent protection on a switching tube in an inverter unit, an embodiment of the present application provides a controller, which has a structure as shown in fig. 1 and specifically includes: the circuit comprises a first power line 01, a second power line 02, an inversion unit 03, a first sampling module 11, a first comparison module 12, a second sampling module 13 and a second comparison module 14.
In the controller, a high-potential end on the direct current side of an inverter unit 03 is electrically connected to a first power line 01, and a low-potential end on the direct current side of the inverter unit 03 is electrically connected to a second power line 02; the first sampling module 11 is electrically connected with a first power line 01 to obtain a first sampling signal Vc1, and the output end of the first sampling module 11 is electrically connected with the input end of the first comparing module 12; the second sampling module 13 is electrically connected with a second power line 02 to obtain a second sampling signal Vc2, and an output end of the second sampling module 13 is electrically connected with an input end of the second comparing module 14; the output ends of the first comparing module 12 and the second comparing module 14 are electrically connected to the inverting unit 03.
In addition, the power terminals of the first comparing module 12 and the second comparing module 14 receive the power voltage VCC, and the power terminal is grounded GND.
The first sampling signal Vc1 represents a current of a loop where the first power line 01 is located, and the second sampling signal Vc2 represents a current of a loop where the second power line 02 is located, so that the first sampling module 11 samples the current of the loop where the first power line 01 is located by obtaining the first sampling signal Vc1, and the second sampling module 13 samples the current of the loop 02 where the second power line is located by obtaining the second sampling signal Vc 2.
In operation, the first comparing module 12 compares the first sampling signal Vc1 with a first reference signal VREF1 representing a maximum current value that the first power line 01 can bear, to obtain a first protection signal Vb1, that is: the first comparing module 12 compares the first sampling signal Vc1 with the first reference signal VREF1, determines whether the first power line 01 is over-current, and outputs a first protection signal Vb1 when the first power line 01 is over-current; specifically, when the first sampling signal Vc1 is greater than the first reference signal VREF1, the first protection signal Vb1 is obtained.
The second comparing module 14 compares the second sampling signal Vc2 with a second reference signal VREF2 representing the maximum current value that the second power line 02 can bear, to obtain a second protection signal Vb2, that is: the second comparing module 14 compares the second sampling signal Vc2 with the second reference signal VREF2, determines whether the second power line 02 is over-current, and outputs a second protection signal Vb2 when the second power line 02 is over-current; specifically, when the second sampling signal Vc2 is greater than the second reference signal VREF2, the second protection signal Vb2 is obtained.
It should be noted that, the first reference signal VREF1 and the second reference signal VREF2 may be reference voltage values, and in practical applications, including but not limited to this embodiment, they are not specifically limited herein as the case may be, but they are the same and are consistent with the corresponding sampling signals.
The inversion unit 03 reduces its output current according to the received first protection signal Vb1 and/or second protection signal Vb2, that is: when overcurrent occurs in the inverter unit 03, the output current of the inverter unit is reduced.
It should be noted that the signal input types of the same-direction input end and the reverse-direction input end of each comparison module may be designed according to a protection execution strategy (high-level protection/low-level protection) of the inverter unit 03; if the protection is high level protection, the sampling signal can be input to the comparison module at the same-direction input end, and the reference signal can be input to the reverse-direction input end, that is: when the corresponding sampling signal is greater than the corresponding reference signal, outputting a corresponding protection signal, wherein the corresponding protection signal is a high-level signal; if the protection is low level protection, the comparison module can input a reference signal at the same-direction input end and a sampling signal at the reverse-direction input end, namely: and outputting a corresponding protection signal when the corresponding sampling signal is greater than the corresponding reference signal, wherein the corresponding protection signal is a low-level signal. Of course, the level conversion of the protection signal may also be implemented by an inverter, which is not limited in this application.
Therefore, the controller provided by the application can perform overcurrent protection on the switching tube in the inverter unit 03, and further the power safety of the inverter unit 03 is improved.
It should be noted that overcurrent protection can be realized through the second sampling module 13 and the second comparing module 14; by the first sampling module 11 and the first comparing module 12, not only overcurrent protection but also short circuit protection between phases and the ground can be realized. Specifically, by arranging the first sampling module 11 and the first comparing module 12, when a phase (U/V/W phase) ground short circuit occurs, the current does not flow through the lower tube, but directly flows through the ground after passing through the upper tube, at this time, an overcurrent occurs, a first sampling signal Vc1 sampled by the first sampling module 11 is greater than a first reference signal VREF1, and the first comparing module 12 outputs a first protection signal Vb 1; when the inversion unit 03 receives the first protection signal Vb1, the output current is stopped, so that under the condition of short circuit between the phases and the ground, an overcurrent protection effect is realized, and an upper tube can be protected from being damaged. By arranging the second sampling module 13 and the second comparing module 14, the protection of the switching tube can be realized under other conditions if overcurrent occurs, especially when general overcurrent occurs, such as large load or input undervoltage overcurrent occurs.
Another embodiment of the present application provides a specific implementation manner of the first sampling module 11, and a specific structure thereof is shown in fig. 2, and specifically includes: a first sampling resistor Rc1 and a differential circuit 111.
In this embodiment of the first sampling module 11, the first sampling resistor Rc1 is connected in series in the first power line 01; two input ends of the differential circuit 111 are respectively connected to two ends of the first sampling resistor Rc1, and an output end of the differential circuit 111 serves as an output end of the first sampling module 11.
In operation, the first sampling resistor Rc1 converts the current in the loop in which the first power line 01 is located into a voltage across itself, inputs the voltage into the differential circuit 111, amplifies the voltage by the differential circuit 111, and outputs the amplified voltage as the first sampling signal Vc 1.
The amplification ratio of the differential circuit 111 is related to the design of the differential circuit and is determined by the parameters of the corresponding devices therein, so that the amplification ratio can be set according to the actual requirements, and the values thereof are not specifically limited herein, which is within the protection scope of the present application.
The above is only one specific embodiment of the first sampling module 11, and in practical applications, including but not limited to the above embodiments, the embodiments are not specifically limited herein, and may be within the protection scope of the present application as the case may be.
In another embodiment of the present application, the differential circuit 111 includes a high side current monitor; the structure of the high-voltage side current monitor is shown in fig. 3, and specifically includes: the circuit comprises a transconductance amplifier IC, a transfer switch tube Qz, a first resistor R1, a second resistor R2 and a third resistor R3.
Two input ends of the transconductance amplifier IC are respectively connected to two ends of the first sampling resistor Rc1 through a second resistor R2 and a third resistor R3; the output end of the transconductance amplifier IC is connected with the control end of a conversion switching tube Qz, the input end of the conversion switching tube Qz is connected with the low potential end of a first sampling resistor Rc1, and the output end of the conversion switching tube Qz is grounded GND through a first resistor R1; the high potential end of the first resistor R1 serves as the output end of the differential circuit 111.
In operation, the transconductance amplifier IC converts the voltage at the two ends of the first sampling resistor Rc1 into a current signal, and turns on the transfer switching tube Qz through the current signal; after the transfer switch Qz is turned on, a current flows through the first resistor R1 through the transfer switch Qz, and a voltage across the first resistor R1 is used as the first sampling signal Vc 1.
The above is only one specific embodiment of the differential circuit 111, and in practical applications, including but not limited to the above embodiments, the embodiments are not limited herein, and may be within the protection scope of the present application.
Another embodiment of the present application provides a specific implementation manner of the second sampling module 13, and the structure of the second sampling module is shown in fig. 4, and specifically includes: a second sampling resistance Rc 2.
In this embodiment of the second sampling module 13, the second sampling resistor Rc2 is connected in series to the second power line 02, and one end of the second sampling resistor Rc2 is grounded; the high potential end of the second sampling resistor Rc2 serves as the output end of the second sampling module 13.
In operation, the second sampling resistor Rc2 converts the current in the loop of the second power line 02 into a voltage across itself, and outputs the voltage as the second sampling signal Vc 2.
The above is only a specific embodiment of the second sampling module 13, and in practical applications, including but not limited to the above embodiment, the embodiment is not specifically limited herein, and may be within the protection scope of the present application as the case may be.
Another embodiment of the present application provides a specific structure of the first comparing module 12 and the second comparing module 14, which is shown in fig. 5, and specifically includes: a comparator 20 and a pull-up resistor Ra.
In this embodiment, the non-inverting input terminal of the comparator 20 receives the corresponding sampling signal, the inverting input terminal of the comparator 20 receives the corresponding reference signal, and the output terminal of the comparator 20 serves as the output terminal of the corresponding comparing module, and outputs the corresponding protection signal when the corresponding sampling signal is greater than the corresponding reference signal; the pull-up resistor Ra is provided between the power source terminal positive electrode of the comparator 20 and the output terminal of the comparator 20.
The above is only one specific embodiment of the comparison module, and in practical applications, including but not limited to the above embodiments, the embodiments are not specifically limited herein, and may be within the protection scope of the present application as the case may be.
Another embodiment of the controller provided in another embodiment of the present application is specifically configured as shown in fig. 6, and on the basis of the above embodiment, the controller further includes: the signal processing module 15 is protected.
In this embodiment, the first input terminal of the protection signal processing module 15 is electrically connected to the output terminal of the first comparing module 12; a second input end of the protection signal processing module 15 is electrically connected with an output end of the second comparison module 14; the output end of the protection signal processing module 15 is electrically connected with the inversion unit 03.
In operation, the protection signal processing module 15 generates a third protection signal Vb3 according to the first protection signal Vb1 and/or the second protection signal Vb2, and outputs the third protection signal Vb3 to the inverting unit 03, and the inverting unit 03 reduces its output current according to the third protection signal Vb 3.
In another specific embodiment of the present application, the structure of the protection signal processing module 15 is shown in fig. 7, and specifically includes: a first impedance branch 151 and a second impedance branch 152.
One end of the first impedance branch 151 is used as a first input end of the protection signal processing module 15, and one end of the second impedance branch 152 is used as a second input end of the protection signal processing module 15; the other end of the first impedance branch 151 is connected to the other end of the second impedance branch 152, and the connection point is used as the output end of the protection signal processing module 15.
In operation, when the protection signal processing module 15 receives the first protection signal Vb1 and the second protection signal Vb2, that is, the first power line 01 and the second power line 02 both have overcurrent, and if the voltage value of the first protection signal Vb1 is equal to the voltage value of the second protection signal Vb2, the voltage value of the third protection signal Vb3 output by the output end of the protection signal processing module 15 is equal to the voltage value of the first protection signal Vb1 and the voltage value of the second protection signal Vb 2; if the voltage value of the first protection signal Vb1 is not equal to the voltage value of the second protection signal Vb2, the voltage value of the third protection signal Vb3 output by the output terminal of the protection signal processing module 15 is related to the impedance values of the two impedance branches and the voltage value of the first protection signal Vb1 or the voltage value of the second protection signal Vb 2.
When the protection signal processing module 15 receives only the first protection signal Vb1 or the second protection signal Vb2, that is, the first power line 01 or the second power line 02 is over-current, the voltage value of the third protection signal Vb3 is equal to the divided voltage of the corresponding impedance branch, which is related to the impedance values of the two impedance branches and the voltage value of the first protection signal Vb1 or the voltage value of the second protection signal Vb 2.
In another embodiment of the present application, the maximum current value that the second power line 02 represented by the second reference signal VREF2 can bear is smaller than the maximum current value that the first power line 01 represented by the first reference signal VREF1 can bear, for example, when the current of the loop in which the second power line 02 is located is greater than 30A, the protection is triggered, and the current of the loop in which the first power line 01 is located is greater than 35A, so that the reliability of the controller can be further improved. The maximum current that the first power line and the second power line can bear does not mean only the maximum current that the power lines can bear, but is the maximum current that the loop of the power lines can bear based on the whole circuit design consideration, especially the maximum current that the devices of the loop of the power lines can bear when various faults occur, such as a switch tube.
In another embodiment of the present application, each of the first impedance branch 151 and the second impedance branch 152 includes: and when the number of the divider resistors is more than 2, all the divider resistors are connected in series, and two ends of the series connection are respectively used as two ends of the corresponding impedance branch.
In one embodiment, as shown in fig. 8, the first sampling signal Vc1 is input to the inverting input terminal of the first comparing module 12, the first reference signal VREF1 is input to the inverting input terminal of the first comparing module 12, and when an overcurrent occurs in the loop in which the first power line is located, the first protection signal is at a high level; similarly, the second sampling signal Vc2 is input to the inverting input terminal of the second comparing module 14, the second reference signal VREF2 is input to the inverting input terminal of the second comparing module 14, and when an overcurrent occurs in the loop where the second power line is located, the second protection signal is also at a high level. Taking the protection signal processing module 15 shown in fig. 8 as an example, the first voltage-dividing resistor Rf1 is used as the first impedance branch 151, and the second voltage-dividing resistor Rf2 is used as the second impedance branch 152; when the first power line 01 and the second power line 02 simultaneously output current, the voltage value Vsc of the third protection signal Vb3 becomes VCC; when the first power line 01 is overcurrent, the voltage value Vsc of the third protection signal Vb3 is Rf2/(Rf1+ Rf2) × VCC; when the second power supply line 02 is overcurrent, the voltage value Vsc of the third protection signal Vb3 is Rf1/(Rf1+ Rf2) × VCC; VCC is a power supply voltage of the first comparing module and the second comparing module, Rf1 is a first voltage dividing resistor, and Rf2 is a second voltage dividing resistor.
On the basis of the foregoing embodiments, another embodiment of the present application provides a specific implementation of the inverter unit 03, and the structure of the inverter unit is as shown in fig. 9, which specifically includes: inverter bridge 100, drive module 200, control module 300.
In this embodiment of inverter unit 03, the dc side of inverter bridge 100 is the dc side of inverter unit 03 and the ac side of inverter bridge 100 is the ac side of inverter unit 03; the output end of the control module 300 is electrically connected with the input end of the driving module 200, and sends the control signal to the driving module 200, and the driving module 200 generates a driving signal according to the control signal and sends the driving signal to the control end of the inverter bridge; the inverter bridge 100 outputs an electric signal for driving the rear-stage motor to work according to the driving signal; specifically, the control unit may include an IPM (intelligent power module), the IPM outputs a PWM control signal, the driving unit amplifies the PWM control signal to generate a driving signal, and sends the driving signal to the control end of the inverter bridge, the IPM usually has a protection function, and a protection reference signal is provided therein, and generally when the current sampling signal is greater than the protection reference signal provided therein, the IPM performs a protection operation.
In a specific embodiment of the present application, the output end of the protection signal processing module 15 is electrically connected to the control module 300, and the control module 300 presets a third reference signal, that is, a protection reference signal built in the IPM; when the control module 300 receives the third protection signal Vb3 and the third protection signal Vb3 is greater than the third reference signal, the control module 300 stops outputting the control signal or outputs the control signal for decreasing the output current of the inverter bridge 100. In conjunction with fig. 8, the third reference signal Vref3< VCC; and Vref3< Rf2/(Rf1+ Rf2) × VCC; and Vref3< Vsc is Rf1/(Rf1+ Rf2) × VCC, so that protection can be performed when overcurrent occurs in the loop of the first power line, and overcurrent occurs in the loop of the second power line. That is, in design, when it is ensured that various overcurrent phenomena occur, the corresponding voltage value in the third protection signal Vb3 is greater than the third reference signal.
It should be noted that the third reference signal VREF3 may be a reference voltage value, and in practical applications, including but not limited to this embodiment, it is not specifically limited herein as the case may be, but is consistent with the first protection signal Vb1 and the second protection signal Vb 2.
Alternatively, the output current of the inverter bridge 100 may be decreased by decreasing the duty ratio of the control signal, and the output current of the inverter bridge 100 may also be decreased by increasing the period of the control signal, which is not specifically limited herein and is within the protection scope of the present application.
In another embodiment of the present application, the output terminal of the protection signal processing module 15 is electrically connected to the driving module 200; when the driving module 200 receives the third protection signal Vb3, the driving module 200 pulls the control signal high or low according to the third protection signal Vb3, so that the inverter bridge 100 stops working, and the inverter unit 03 is protected.
On the basis of the foregoing embodiments, this embodiment further provides another specific implementation of the inverter unit 03, and the structure of the inverter unit is as shown in fig. 10, and specifically includes: inverter bridge 100, drive module 200, control module 300, and buffer module 400.
In this embodiment of inverter unit 03, the dc side of inverter bridge 100 is the dc side of inverter unit 03 and the ac side of inverter bridge 100 is the ac side of inverter unit 03; the output end of the control module 300 is electrically connected with the buffer module 400, the control signal is sent to the driving module 200 through the buffer module 400, and the driving module 200 generates a driving signal according to the control signal and sends the driving signal to the control end of the inverter bridge; the inverter bridge 100 outputs an electrical signal for driving the rear stage motor to operate according to the driving signal.
In a specific embodiment of the present application, the buffer module 400 is provided with a protection control circuit, and the output end of the protection signal processing module 15 is electrically connected to the protection control circuit; when the protection control circuit receives the third protection signal Vb3, the protection control circuit pulls the control signal low or high according to the third protection signal Vb3, so that the inverter bridge 100 stops working, and the inverter unit 03 is protected. The protection control circuit may include a trigger, the trigger is used to transmit the control signal, and when the third protection signal is received, the trigger pulls down or raises the control signal, that is, the trigger outputs a continuous low level or high level to the post-stage circuit, the inverter bridge loses the PWM control signal, and cannot work, and the current is reduced. Specifically, the D flip-flop and the RS flip-flop may be used.
In another embodiment of the present application, the output terminal of the protection signal processing module 15 is electrically connected to the driving module 200; when the driving module 200 receives the third protection signal Vb3, the driving module 200 pulls the control signal high or low according to the third protection signal Vb3, so that the inverter bridge 100 stops working, and the inverter unit 03 is protected.
Another embodiment of the present application provides a specific implementation manner of the inverter bridge 100, the structure of which is shown in fig. 1 to 8 (the motor M is not shown in fig. 3 to 8), and specifically includes: six switching tubes Q.
In this embodiment of the inverter bridge 100, every two switching tubes Q are connected in series to form a phase bridge arm; the input ends of the three-phase bridge arms are all electrically connected, and the connection point is used as a direct-current side high-potential end of the inverter bridge 100; the output ends of the three-phase bridge arms are all electrically connected, and the connection point is used as a direct-current side low-potential end of the inverter bridge 100; the connection points of the two switching tubes Q in each phase bridge arm are respectively used as three-phase ports at the alternating current side of the inverter bridge 100 and connected with the power supply end of the motor M.
In another embodiment of the present application, as shown in fig. 10, the inverter unit 03 further includes: a detection module 500; each detection end of the detection module 500 is respectively disposed at the dc side and the ac side of the inverter bridge 100, and the output end of the detection module 500 is connected to the acquisition end of the control module 300 for detecting the current and the voltage at the corresponding positions.
Another embodiment of the present application provides a control circuit, which has a structure as shown in fig. 1, and specifically includes: the circuit comprises a first power line 01, a second power line 02, an inversion unit 03, a first sampling module 11, a first comparison module 12, a second sampling module 13 and a second comparison module 14.
In the control circuit, a high-potential end on the direct current side of the inverter unit 03 is electrically connected to a first power line 01, and a low-potential end on the direct current side of the inverter unit 03 is electrically connected to a second power line 02; the first sampling module 11 is electrically connected with a first power line 01 to obtain a first sampling signal Vc1, and the output end of the first sampling module 11 is electrically connected with the input end of the first comparing module 12; the second sampling module 13 is electrically connected with a second power line 02 to obtain a second sampling signal Vc2, and an output end of the second sampling module 13 is electrically connected with an input end of the second comparing module 14; the output ends of the first comparing module 12 and the second comparing module 14 are electrically connected to the inverting unit 03.
In addition, the power terminals of the first comparing module 12 and the second comparing module 14 receive the power voltage VCC, and the power terminal is grounded GND.
Since the control circuit has the same structure as the controller, the detailed description thereof is omitted here, and reference is made to the above description.
In a specific embodiment of the present application, the control circuit further includes a protection signal processing module 15; moreover, the connection mode and function of the protection signal processing module 15 in the control circuit and the protection signal processing module 15 in the controller are the same, and are not described again.
It should be noted that the control circuit is the same as the controller, and therefore, other structures and functions in the control circuit will not be described in detail, and reference may be made to the related description in the controller.
In the above description of the disclosed embodiments, features described in various embodiments in this specification can be substituted for or combined with each other to enable those skilled in the art to make or use the present application. The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.

Claims (10)

1. A controller comprises a first power line, a second power line and an inversion unit, wherein a high-potential end on the direct current side of the inversion unit is electrically connected with the first power line, and a low-potential end on the direct current side of the inversion unit is electrically connected with the second power line; characterized in that, the controller further comprises: the device comprises a first sampling module, a first comparison module, a second sampling module and a second comparison module; wherein:
the first sampling module is electrically connected with the first power line to acquire a first sampling signal; the first sampling signal is used for representing the current of the first power line; the output end of the first sampling module is electrically connected with the input end of the first comparing module; the first comparison module compares the first sampling signal with a first reference signal representing the maximum current value which can be borne by the first power line to obtain a first protection signal;
the second sampling module is electrically connected with the second power line to acquire a second sampling signal; the second sampling signal represents the current of the second power line; the output end of the second sampling module is electrically connected with the input end of the second comparison module; the second comparison module compares the second sampling signal with a second reference signal representing the maximum current value which can be borne by the second power line to obtain a second protection signal;
the output ends of the first comparison module and the second comparison module are electrically connected with the inversion unit, the inversion unit receives the first protection signal and/or the second protection signal, and the inversion unit reduces self output current according to the first protection signal and/or the second protection signal.
2. The controller of claim 1, further comprising: a protection signal processing module; wherein:
the first input end of the protection signal processing module is electrically connected with the output end of the first comparison module; the second input end of the protection signal processing module is electrically connected with the output end of the second comparison module; the protection signal processing module generates a third protection signal according to the first protection signal and/or the second protection signal;
the output end of the protection signal processing module is electrically connected with the inversion unit and outputs the third protection signal to the inversion unit; the inversion unit reduces output current according to the third protection signal;
the maximum current value that the second power line characterized by the second reference signal can bear is smaller than the maximum current value that the first power line characterized by the first reference signal can bear.
3. The controller of claim 2, wherein the protection signal processing module comprises: a first impedance branch and a second impedance branch; wherein:
one end of the first impedance branch is used as a first input end of the protection signal processing module, and one end of the second impedance branch is used as a second input end of the protection signal processing module;
the other end of the first impedance branch circuit is connected with the other end of the second impedance branch circuit, and a connection point is used as an output end of the protection signal processing module.
4. The controller according to any one of claims 1-3, wherein the first sampling module comprises: a first sampling resistor and a differential circuit; wherein:
the first sampling resistor is connected in series with the first power line;
two input ends of the differential circuit are respectively connected to two ends of the first sampling resistor, and an output end of the differential circuit is used as an output end of the first sampling module.
5. The controller of claim 4, wherein the differential circuit comprises a high side current monitor; the high side current monitor comprises: the circuit comprises a transconductance amplifier, a conversion switching tube, a first resistor, a second resistor and a third resistor; wherein:
two input ends of the transconductance amplifier are respectively connected to two ends of the first sampling resistor through the second resistor and the third resistor;
the output end of the transconductance amplifier is connected with the control end of the conversion switch tube, the input end of the conversion switch tube is connected with the low potential end of the first sampling resistor, and the output end of the conversion switch tube is grounded through the first resistor;
the high potential end of the first resistor serves as an output end of the differential circuit.
6. The controller according to any one of claims 1-3, wherein the second sampling module comprises: a second sampling resistor; wherein:
the second sampling resistor is connected in series with the second power line;
and the high potential end of the second sampling resistor is used as the output end of the second sampling module.
7. The controller according to claim 2 or 3, wherein the inverter unit comprises: the system comprises an inverter bridge, a driving module and a control module; wherein:
the output end of the control module is electrically connected with the input end of the driving module and sends a control signal to the driving module; the driving module generates a driving signal according to the control signal and sends the driving signal to a control end of the inverter bridge;
the third protection signal is output to the control module, the control module presets a third reference signal, and when the third protection signal is greater than the third reference signal, the control module stops outputting the control signal or outputs the control signal for reducing the output current of the inverter bridge;
or the third protection signal is output to the driving module, and the driving module pulls the control signal high or low according to the third protection signal.
8. The controller according to claim 2 or 3, wherein the inverter unit comprises: the system comprises an inverter bridge, a driving module, a buffering module and a control module;
the output end of the control module is electrically connected with the buffer module, a control signal is sent to the drive module through the buffer module, and the drive module generates a drive signal according to the control signal and sends the drive signal to the control end of the inverter bridge; the buffer module is provided with a protection control circuit, the third protection signal is output to the protection control circuit, and the protection control circuit pulls the control signal low or high according to the third protection signal;
or the third protection signal is output to the driving module, and the driving module pulls the control signal high or low according to the third protection signal.
9. A control circuit is characterized by comprising a first power line, a second power line and an inversion unit, wherein the high-potential end of the direct current side of the inversion unit is electrically connected with the first power line, and the low-potential end of the direct current side of the inversion unit is electrically connected with the second power line; characterized in that the control circuit further comprises: the device comprises a first sampling module, a first comparison module, a second sampling module and a second comparison module; wherein:
the first sampling module is electrically connected with the first power line to acquire a first sampling signal; the first sampling signal is used for representing the current of the first power line; the output end of the first sampling module is electrically connected with the input end of the first comparing module; the first comparison module compares the first sampling signal with a first reference signal representing the maximum current value which can be borne by the first power line to obtain a first protection signal;
the second sampling module is electrically connected with the second power line to acquire a second sampling signal; the second sampling signal represents the current of the second power line; the output end of the second sampling module is electrically connected with the input end of the second comparison module; the second comparison module compares the second sampling signal with a second reference signal representing the maximum current value which can be borne by the second power line to obtain a second protection signal;
the output ends of the first comparison module and the second comparison module are electrically connected with the inversion unit, the inversion unit receives the first protection signal and/or the second protection signal, and the inversion unit reduces self output current according to the first protection signal and/or the second protection signal.
10. The control circuit of claim 9, further comprising: a protection signal processing module; wherein:
the first input end of the protection signal processing module is electrically connected with the output end of the first comparison module; the second input end of the protection signal processing module is electrically connected with the output end of the second comparison module; the protection signal processing module generates a third protection signal according to the first protection signal and/or the second protection signal;
the output end of the protection signal processing module is electrically connected with the inversion unit and outputs the third protection signal to the inversion unit; and the inversion unit reduces the output current according to the third protection signal.
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