CN211979470U - Power electronic system function safety control device - Google Patents
Power electronic system function safety control device Download PDFInfo
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- CN211979470U CN211979470U CN202020773996.0U CN202020773996U CN211979470U CN 211979470 U CN211979470 U CN 211979470U CN 202020773996 U CN202020773996 U CN 202020773996U CN 211979470 U CN211979470 U CN 211979470U
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Abstract
The utility model discloses a power electronic system function safety control device. The device comprises a power electronic switching tube and a power electronic switching tube driving circuit, and is characterized by further comprising an overload control module, an upper computer and a main control circuit, wherein the overload control module is in communication connection with the power electronic switching tube, the power electronic switching tube driving circuit, the upper computer and the main control circuit respectively, and the overload control module determines safe current or safe power based on control commands from the upper computer and acquired temperature data of the power electronic switching tube so as to adjust the main control circuit to generate corresponding pulse width modulation waves to drive the power electronic switching tube. The utility model discloses can calculate optimal safe electric current or safe power in real time to guarantee that power electronic equipment is in overload operation, the temperature is no longer than safe range.
Description
Technical Field
The utility model relates to a power electronic technology field, more specifically relates to a power electronic system function safety control device.
Background
The rated current or power of the existing power electronic systems such as a motor driver, a power supply, a rectifier, an inverter and the like is the current or power corresponding to the power electronic systems when the power electronic devices (switching tubes) can operate below a temperature limit value for a long time. However, in actual use, due to differences in usage environment temperature, device start-stop frequency, and load full-load operation time, there is a large margin for rated operation current and power of the power electronic device. These margins result in a higher rated current or power for the switching tube of the electrical and electronic equipment, as well as a higher volume and weight for the power electronic equipment, thus resulting in a lot of unnecessary overhead and costs for the overall product.
At present, no device or equipment capable of accurately controlling overload operation of power electronic equipment exists, when the power electronic equipment is designed, a power electronic switching tube over-conservative model selection and control scheme is often adopted, for example, a certain margin is reserved according to rated current or power of a load, and when the temperature of the power electronic switching tube is too high, a shutdown method is adopted to cool the equipment. The existing solutions thus add considerable additional expense and cost to the final product and affect the product performance.
Disclosure of Invention
The utility model aims at overcoming above-mentioned prior art's defect, providing a power electronic system function safety control device, guaranteeing that power electronic switch tube temperature is not more than under the condition of maximum operating temperature, furthest's hoisting system's overload performance.
The utility model provides a power electronic system function safety control device. The device comprises a power electronic switching tube, a power electronic switching tube driving circuit, an overload control module, an upper computer and a main control circuit, wherein the power electronic switching tube driving circuit is connected with the overload control module through a power supply lineThe overload control module is respectively in communication connection with the power electronic switching tube, the power electronic switching tube driving circuit, the upper computer and the main control circuit, and the overload control module determines the safe current I based on the control command from the upper computer and the collected temperature data of the power electronic switching tubemaxOr a safety power Pe_maxAnd the main control circuit is adjusted to generate corresponding pulse width modulation waves to drive the power electronic switching tube through the power electronic switching tube driving circuit.
In one embodiment, the command sent by the upper computer indicates that the current is less than ImaxOr power less than Pe_maxUnder the condition of (3), the overload control module directly transmits the control command of the upper computer to the main control circuit, and the main control circuit generates pulse width modulation waves with corresponding frequency and duty ratio to drive the power electronic switching tube.
In one embodiment, the transmitted steering command at the upper computer indicates that the current is greater than ImaxOr power greater than Pe_maxUnder the condition of (3), the overload control module sends the received control command of the upper computer to the main control circuit and instructs the upper computer to reduce power or current.
In one embodiment, the overload control module is configured to determine the safety current I in the following mannermax：
Setting a prediction time range and a prediction time step, and acquiring the total heat dissipation of the power electronic switching tube in the prediction time range based on the heat dissipated by the power electronic switching tube in different prediction time steps
Based on total heat dissipation
Determining the maximum energy absorbed by the power electronic switch tube in a prediction time range
According to what is obtained
And temperature variation information of the power electronic switching tube, and determining
Corresponding safety current Imax。
In one embodiment, the overload control module is configured to determine the output current or power based on a limit PI controller, including:
limiting the temperature of the power electronic switching tube by TlimWith a measured value of temperature TSThe difference value of (2) is input into a limit value PI controller;
at TlimGreater than or equal to TSUnder the condition of (1), limiting the output of the PI controller to be 0, adding the current or power indicated by the upper computer to the output of the PI controller to serve as the output of the overload control module, and outputting the output to the main control circuit for generating a corresponding pulse width modulation wave;
at TlimLess than TSIn the case of (1), limiting the output of the PI controller to a negative value reduces the current or power indicated by the upper computer and reduces the output of the overload control module until TlimGreater than or equal to TSUntil now.
In one embodiment, the overload control module is set as an independent module or integrated in the upper computer or the main control circuit in a sub-module manner.
Compared with the prior art, the utility model has the advantages of, through control power electronic switch tube temperature and electric current and through carrying out overload control to power electronic device, realize the regulation and control to power electronic system electric current or power, under the circumstances that guarantees that power electronic switch tube temperature is not more than the highest operating temperature, furthest's lift system's overload performance.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic diagram of a power electronic system function safety control device according to an embodiment of the present invention;
fig. 2 is a flow chart illustrating the processing of current or power commands communicated by the upper computer by the overload control module according to an embodiment of the present invention;
fig. 3 is a schematic diagram of calculating safe current or safe power based on model predictive control according to an embodiment of the present invention;
fig. 4 is a schematic diagram of solving for safe current or safe power based on a PI controller according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an overload control module according to an embodiment of the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
The utility model provides a power electronic system function safety control device, it is shown with reference to fig. 1, the device includes power electronic switch tube 120 (or be referred to as the switch tube for short), power electronic switch tube drive circuit 140, host computer 130 and overload control module 110 (or call power electronic system overload operation controlling means). The upper computer 130 is used for controlling the power electronic system, for example, the upper computer 130 is a computer directly sending a control command, and a plurality of signal changes can be displayed on a screen. The overload control module 110 can exist in various forms, for example, it is provided as a stand-alone module, or it is integrated in a main control circuit or an upper computer in the form of a sub-module. For example, the overload control module 110 can be connected in series between the power electronic driving circuit and the controller of the main control circuit, or integrated within the controller. The overload control module 110 controls the current or power of the power electronic system by monitoring the temperature and current of the power electronic switching tube 120 and by an overload control algorithm, and improves the overload performance of the power electronic system to the maximum extent under the condition that the temperature of the switching tube is not higher than the highest operating temperature.
Specifically, combine fig. 1 and fig. 2 to show, the host computer sends commands such as electric current or power at first for the utility model discloses an overload control module, overload control module also can gather data such as electric current, temperature of controlled power electronic switch pipe in real time simultaneously. According to the collected information of current, temperature and the like of the power electronic switching tube, the overload control module can calculate the optimal safe current (I)max) Or safe power (P)e_max) And, the optimum safe current or safe power mean that the maximum current or maximum power that power electronic system can bear under the condition of guaranteeing that the switch tube temperature is not more than the highest operating temperature.
In one case, when the command of the current or power of the upper computer is less than ImaxOr Pe_maxThe overload control module will be upThe current and power commands of the bit machine are directly transmitted to the main control circuit of the power electronic equipment, and the main control circuit can generate PWM waves (pulse width modulation waves) with certain frequency and certain duty ratio (or modulation ratio) according to the current or power commands. The generated PWM wave is sent to a power electronic switch tube driving circuit, so that the power electronic switch is driven to be conducted or closed, and the regulation and control of electric energy are realized.
In another case, when the current command sent by the upper computer is larger than ImaxOr the power command is greater than Pe_maxWhen the overload control module is in use, the overload control module will send ImaxOr Pe_maxAnd sending the command to a main control circuit, informing an upper computer, and enabling the upper computer to reduce power, current commands and action frequency according to actual conditions to cool the system.
It should be noted that, because the rated power and the current of the power electronic system are the maximum current or the power of the safety value, the temperature of the power electronic switch tube is not over the maximum current or the maximum power of the safety value when the system works for a long time, therefore the utility model provides an I calculated by the overload control modulemaxOr Pe_maxWill always be greater than or equal to the rated current and power of the system. Therefore the utility model discloses can guarantee that power electronic system (the temperature is no longer than the highest temperature) make full use of power electronic overload operation provides the ability of extra power under the circumstances of safety to promote system's power density.
The utility model provides an overload control module can adopt multiple mode to calculate ImaxAnd Pe_maxExamples include, but are not limited to, model-based predictive control or regulation via a PI controller.
1) Control method based on model prediction
Regarding the power electronic switching tube as a lumped parameter node, according to the definition of specific heat capacity, the temperature rise of the power electronic switching tube can be expressed as:
wherein Q isinHeat generated for power electronic switch tubes, i.e. due toHeat generated by turn-on loss, turn-off loss, turn-on loss, and the like; winThe power for generating heat for the switching tube in each time step delta t; qoutHeat dissipation from the switch tube to a heat sink or the environment by conduction, radiation, and convection; c is equivalent specific heat capacity, m is equivalent mass of the switch tube, and heat dissipation power WoutCan be approximately expressed as:
wherein, TSFor the temperature of the switching tube, TambIs the ambient temperature, RTThe equivalent thermal resistance can be obtained through a steady-state experiment based on the formula (1) and the formula (2) and is stored in a data table, wherein the data table is input as the switching frequency and the current amplitude of the switching tube and output as the equivalent thermal resistance. Whereby RTI.e. can represent WoutAnd the temperature of the switching tube.
Assume that the number of time steps in the prediction horizon of the model predictive control is N and that the switching tube temperature rise is the same for each prediction time step. According to equation (2), the amount of heat dissipated over different time steps can be predicted as:
wherein the superscripts in the above formulae (3) to (6) denote the sequence numbers of the time steps, Δ TSIf the temperature rise of the switching tube in each prediction step is used, the total heat dissipation in the prediction range can be represented as:
control of model predictive controlThe aim is to adaptively limit the temperature of the switching tube to a preset temperature value T when the power electronic system runs in overloadlimThe following. In extreme conditions, the switching tube temperature should be equal to T in steady statelim. Therefore, the maximum energy absorbed by the switch tube in the prediction time range
Can be expressed as:
wherein, TSFor the temperature of the switch tube, the equivalent heat m of the switch tube can be obtained through experiments or calculated according to the packaging size of the switch tube. Thus, the maximum temperature rise of the corresponding switching tube in each prediction step is:
by measuring TSThen, the formula (9) can be substituted according to the formula (8) and the formula (10) to obtain
According to the maximum energy absorbed by the obtained switching tube in a prediction time range
Based on the relation between the loss of the switching tube and the factors such as switching frequency and current, the method can reversely deduce
The corresponding maximum current value and the corresponding switching frequency. Due to the fact that
Has a relationship with both the switching frequency and the current value, and the switching frequency is determined by the load characteristics. Therefore, first of all, the load should be dependent onThe minimum switching frequency which meets the working performance is determined according to the characteristics, and then the maximum current amplitude is determined on the basis.
FIG. 3 is a model-based predictive control calculation ImaxOr Pe_maxSchematic block diagram of (1). T in FIG. 3limAnd N is the temperature limit of the switching tube and the number of time steps in the prediction range, respectively. T isSAnd TambRespectively, a temperature measurement value of the switching tube and an ambient temperature value. I ismaxEnsuring that the temperature of the switch tube does not exceed T under a steady statelimThe maximum current of (c). Since the minimum PWM switching frequency of the switching tube is determined by the load characteristic, the minimum PWM switching frequency can be determined based on
Obtaining Imax. Suppose that in each prediction step, the currents are of the same magnitude Δ IaIncrease or decrease based on
The maximum current amplitude variation in a time step can be obtained
I.e. in fig. 3
In all prediction steps
With the current I currently measuredaAdding to obtain Imax. It is understood that I is obtainedmaxThen, P can be further calculated according to the relation between the current and the powere_max。
2) Concerning the manner of regulation by means of PI controllers
FIG. 4 is a solution I based on a PI controllermaxOr Pe_maxThe PI controller is used for forming a control deviation according to a given value and an actual output value, and linearly combining the proportion and the integral of the deviation to form a control quantity to control a controlled object.Specifically, T islimAnd the temperature T of the switching tubeSThe difference value of (2) is input to a limit PI controller. If TlimGreater than or equal to TSThe output of the PI controller is limited to 0, otherwise to a negative value. Adding the output of the PI controller to the current command I of the upper computera_refNamely, the output of the invented overload control module is output to the main control circuit of the power electronic equipment for generating corresponding PWM. As can be seen from FIG. 5, when T is reachedlimLess than TSWhen the current command I of the upper computer is reduced, namely the actual temperature of the switching tube is higher than the maximum temperature limit allowed by the switching tube, limiting the output of the PI controllera_refAnd the output of the proposed overload control module up to TlimGreater than or equal to TSUntil now. If TlimGreater than or equal to TSIf the output of the PI controller is limited to 0, the output of the overload control is equal to the command I of the upper computera_ref. It should be understood that I in FIG. 4a_refAnd ImaxOr can be a power command P of an upper computere_refAnd Pe_max。
For further understanding the utility model discloses, fig. 5 shows the hardware architecture block diagram of overload control module, including analog-to-digital signal converter (AD), little the control unit (MCU), with the communication interface of host computer communication, with the communication interface of power electronic switch tube drive circuit communication, wherein power electronic switch tube temperature, current information also can directly be sent for through communication interface by little the control unit the utility model discloses an overload control module, little the control unit mainly used realizes the utility model discloses an overload control algorithm.
It should be noted that the unit of the parameter in the formula of the present invention is a standard unit that is commonly used, for example, the unit of power is watt (W), and the unit of current is ampere (a), and the description thereof is omitted. And the electronic circuit device that relates to such as PI controller, switch tube, power electronics switch tube drive circuit etc. can be general device or special device, the utility model discloses do not restrict this.
Through simulation verification, the utility model provides an overload control module through with host computer, power electronic switch tube driving electricityThe main control circuit of the road and power electronic equipment works cooperatively, and the optimal safe current (I) can be calculated in real timemax) Safe power (P)e_max) And the corresponding power electronic switching tube safe PWM switching frequency and the like are used for limiting the current and power commands output by the upper computer or other commands related to the load and assisting the upper computer to plan the operation condition of the power electronic system, so that the temperature does not exceed the safe range while the power electronic equipment is in overload operation. The utility model discloses a switch tube safe current (I) that overload control module calculated in real timemax) Safe power (P)e_max) And the corresponding PWM switching frequency information can be sent to the upper computer in real time, so that the upper computer can be assisted to plan the running condition of the power electronic system, and the PWM command limited by the upper computer is transmitted to the driving circuit of the power electronic switching tube, so that the switching tube is driven to be switched on or switched off, and the temperature of the switching tube is not higher than the highest temperature all the time.
The present invention may be a system, method and/or computer program product. The computer program product may include a computer-readable storage medium having computer-readable program instructions embodied thereon for causing a processor to implement various aspects of the present invention.
The computer readable storage medium may be a tangible device that can hold and store the instructions for use by the instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic memory device, a magnetic memory device, an optical memory device, an electromagnetic memory device, a semiconductor memory device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a Static Random Access Memory (SRAM), a portable compact disc read-only memory (CD-ROM), a Digital Versatile Disc (DVD), a memory stick, a floppy disk, a mechanical coding device, such as punch cards or in-groove projection structures having instructions stored thereon, and any suitable combination of the foregoing. Computer-readable storage media as used herein is not to be construed as transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through a waveguide or other transmission medium (e.g., optical pulses through a fiber optic cable), or electrical signals transmitted through electrical wires.
The computer-readable program instructions described herein may be downloaded from a computer-readable storage medium to a respective computing/processing device, or to an external computer or external storage device via a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers and/or edge servers. The network adapter card or network interface in each computing/processing device receives computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in a computer-readable storage medium in the respective computing/processing device.
The computer program instructions for carrying out operations of the present invention may be assembler instructions, Instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages, including an object oriented programming language such as smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider). In some embodiments, the electronic circuitry can execute computer-readable program instructions by utilizing state information of the computer-readable program instructions to personalize the electronic circuitry, such as a programmable logic circuit, a Field Programmable Gate Array (FPGA), or a Programmable Logic Array (PLA), to thereby implement various aspects of the present invention.
Various aspects of the present invention are described herein with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-readable program instructions.
These computer-readable program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. These computer-readable program instructions may also be stored in a computer-readable storage medium that can direct a computer, programmable data processing apparatus, and/or other devices to function in a particular manner, such that the computer-readable medium storing the instructions comprises an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.
The computer readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer, other programmable apparatus or other devices implement the functions/acts specified in the flowchart and/or block diagram block or blocks.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions. It is well known to those skilled in the art that implementation by hardware, by software, and by a combination of software and hardware are equivalent.
While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the invention is defined by the appended claims.
Claims (8)
1. The utility model provides a power electronic system function safety control device, includes power electronic switch tube, power electronic switch tube drive circuit, its characterized in that still includes overload control module, host computer and master control circuit, wherein, overload control module respectively with power electronic switch tube drive circuit the host computer with master control circuit has communication connection, overload control module is based on come from the control order and the collection of host computer the safe electric current I is confirmed to power electronic switch tube's temperature datamaxOr a safety power Pe_xAnd the main control circuit is adjusted to generate corresponding pulse width modulation waves to drive the power electronic switching tube through the power electronic switching tube driving circuit.
2. The device as claimed in claim 1, wherein the command sent from the upper computer indicates that the current is less than ImaxOr power less than Pe_xUnder the condition of (3), the overload control module directly transmits the control command of the upper computer to the main control circuit, and the main control circuit generates pulse width modulation waves with corresponding frequency and duty ratio to drive the power electronic switching tube.
3. The device as claimed in claim 1, wherein the command sent from the upper computer indicates that the current is greater than ImaxOr power greater than Pe_xUnder the condition of (3), the overload control module sends the received control command of the upper computer to the main control circuit and instructs the upper computer to reduce power or current.
4. Power electronic system functional safety control device according to claim 1, characterized in that the overload control module is configured to determine the safety current I in the following mannermax：
Setting a prediction time range and a prediction time step, and acquiring the total heat dissipation of the power electronic switching tube in the prediction time range based on the heat dissipated by the power electronic switching tube in different prediction time steps
Based on total heat dissipation
Determining the maximum energy absorbed by the power electronic switch tube in a prediction time range
According to what is obtained
And temperature variation information of the power electronic switching tube, and determining
Corresponding safety current Imax。
5. Power electronic system functional safety control device according to claim 4, characterized in that the total heat dissipation capacity of the power electronic switch tube
Expressed as:
the maximum energy absorbed by the power electronic switching tube in a prediction time range
Expressed as:
total heat dissipation combined with the power electronic switch tube
The maximum temperature rise of the power electronic switching tube and the maximum energy absorbed by the power electronic switching tube in a prediction time range
Determining a corresponding safety current Imax；
Wherein the maximum temperature rise of the power electronic switch tube is expressed as
TSIs the measured temperature of the power electronic switch tube, m is the equivalent mass of the power electronic switch tube, TambIs the ambient temperature, RTIs the equivalent thermal resistance, N is the number of time steps in the predicted time horizon, Δ TSThe temperature rise of the power electronic switching tube in each predicted time step is shown, and C is the equivalent specific heat capacity.
6. A power electronic system functional safety control device according to claim 1, characterized in that the overload control module is configured to determine the outputted current or power based on a limit PI controller, comprising:
limiting the temperature of the power electronic switching tube by TlimWith a measured value of temperature TSThe difference value of (2) is input into a limit value PI controller;
at TlimGreater than or equal to TSUnder the condition of (1), limiting the output of the PI controller to be 0, adding the current or power indicated by the upper computer to the output of the PI controller to serve as the output of the overload control module, and outputting the output to the main control circuit for generating a corresponding pulse width modulation wave;
at TlimLess than TSIn the case of (1), limiting the output of the PI controller to a negative value reduces the current or power indicated by the upper computer and reduces the output of the overload control module until TlimGreater than or equal to TSUntil now.
7. Power electronic system function safety control device according to claim 1, characterized in that the overload control module comprises an analog-digital signal converter and a micro control unit, wherein the analog-digital signal converter is used for receiving temperature information or electricity of the power electronic switch tubeThe flow information is converted into a digital signal, and the micro-control unit is configured to determine a safety current I according to the output of the analog-digital signal convertermaxOr a safety power Pe_xAnd the micro control unit is provided with a communication interface for communicating with the upper computer and a communication interface for communicating with the power electronic switching tube driving circuit.
8. The power electronic system function safety control device according to claim 1, wherein the overload control module is set as an independent module or integrated in the upper computer or the main control circuit in a sub-module form.
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