阅读说明：本技术 一种变频器的控制系统 (Control system of frequency converter ) 是由 方茂成 于 2020-05-22 设计创作，主要内容包括：本发明提供一种变频器的控制系统。变频器(60)包括多个串联的功率单元,通过所述功率单元的导通和关断,产生输出电流。作为组件,控制系统包括人机接口10、主控制器20、信号接口组件30、驱动单元40。人机接口10、主控制器20、信号接口组件30、驱动单元40至少包括密钥存储模块、密钥校验模块、密钥交换模块。各个密钥存储模块内存储有密钥,变频器上电时,各组件通过所述密钥交换模块与其他所述组件交换密钥,各组件中的密钥校验模块根据所接受到的密钥校验存储所述密钥存储模块中密钥的正确性。所有组件的校验通过时,变频器进入待机模式。因此,变频器系统只有在完整的状态下才能驱动,保证了变频器系统的完整性,加强了知识产权保护。(The invention provides a control system of a frequency converter. The frequency converter (60) comprises a plurality of power units connected in series, and an output current is generated through the on and off of the power units. The control system includes, as components, a human machine interface 10, a main controller 20, a signal interface component 30, and a driving unit 40. The man-machine interface 10, the main controller 20, the signal interface assembly 30 and the driving unit 40 at least comprise a key storage module, a key verification module and a key exchange module. And keys are stored in the key storage modules, when the frequency converter is powered on, the components exchange keys with other components through the key exchange module, and the key verification module in each component verifies and stores the correctness of the keys in the key storage module according to the received keys. And when the verification of all the components passes, the frequency converter enters a standby mode. Therefore, the frequency converter system can be driven only in a complete state, the integrity of the frequency converter system is ensured, and the intellectual property protection is enhanced.)

1. A control system of a frequency converter is characterized by comprising a man-machine interface (10), a main controller (20), a signal interface component (30) and a driving unit (40),

the frequency converter (60) comprises a plurality of power units connected in series, and an output current is generated through the on and off of the power units,

the main controller (20) exchanges data with the outside through the man-machine interface (10) and receives parameter setting, the main controller (20) is connected with the upper computer (50) through the signal interface component (30), the main controller (20) generates a control instruction,

the driving unit (20) corresponds to the power unit, generates a driving signal according to the control instruction, drives the switch element in the power unit to be switched on and off,

the man-machine interface (10), the main controller (20), the signal interface component (30) and the drive unit (40) at least comprise key storage modules (10a, 20a, 30a, 40a), key verification modules (10b, 20b, 30b, 40b) and key exchange modules (10c, 20c, 30c, 40c) as components,

a key is stored in each of the key storage modules (10a, 20a, 30a, 40a),

each component exchanges keys with other components through the key exchange modules (10d, 20d, 30d, 40d), and the key verification modules (10b, 20b, 30b, 40b) in each component verify the correctness of the keys stored in the key storage modules (10a, 20a, 30a, 40a) according to the received keys.

2. The control system of the frequency converter according to claim 1, characterized in that, when power is on, the components respectively read the key storing module (10a, 20a, 30a, 40a), the key exchanging module (10d, 20d, 30d, 40d) exchanges the key with other components, the key checking module (10b, 20b, 30b, 40b) in each component checks the correctness of the key storing module (10a, 20a, 30a, 40a) according to the received key, and when the checking of all components is passed, the frequency converter enters a standby mode.

3. The control system of claim 1, wherein the key uses a specific string comprising a product lot number, a production date, and a cyclic redundancy check code of the frequency converter.

4. A control system for a transducer according to claim 3, wherein the transducer has a unique identifier, which is managed by means of block chain accounting, and the key is a private key used to sign a transaction.

5. The control system of the frequency converter according to any one of claims 1 to 4, wherein each of the components further includes a key update module (10d, 20d, 30d, 40d), after the human-machine interface (10) or the signal interface component (30) receives a key update instruction, the key exchange module (10c, 20c, 30c, 40c) sends a new key to the other components, and the key update module (10d, 20d, 30d, 40d) in each of the components updates the key in the key storage module (10a, 20a, 30a, 40a) according to the received new key.

6. The control system of claim 5, wherein the key updating module (10d, 20d, 30d, 40d) of each component updates the key and then exchanges the key with the other components through the key exchange module (10d, 20d, 30d, 40d), the key verification module (10b, 20b, 30b, 40b) of each component verifies the correctness of the key stored in the key storage module (10a, 20a, 30a, 40a) according to the received key, and when the verification of all components passes, the completion of the key updating is confirmed.

7. The control system of frequency converter according to claim 6, characterized in that when the verification of at least one component fails, the key update fails, and the master controller (20) reports a failure to stop working.

8. The control system of the frequency converter according to claim 5, wherein the human-machine interface (10) is connected with a cloud platform and receives a key update instruction sent by the cloud platform.

9. The control system of the frequency converter according to claim 5, wherein the signal interface component (30) is connected with an upper computer (50) and receives a key updating instruction sent by the upper computer (50).

Technical Field

The invention relates to the technical field of frequency converters, in particular to integrity protection of all components of a frequency converter system.

Background

The frequency converter is a device which converts a power frequency power supply with fixed frequency and fixed voltage into a variable frequency and variable voltage power supply to be supplied to the motor to change the rotating speed of the motor, thereby improving the operating efficiency and the control capability of a motor transmission system, further meeting the process requirements and realizing the purposes of energy conservation and consumption reduction. The frequency converter of 3KV and above is a high-voltage frequency converter which is widely applied to various industries such as thermal power generation, petroleum, chemical industry, mines, coal, metallurgy, water supply and the like and plays an increasingly important role.

In recent years, with the rapid development of the internet, various data burst and increase, wherein the characteristics of decentralization, non-falsification, distribution and the like of the block chain technology have become important concerns and research directions in many technical fields at present. Each block in the block chain stores transaction data within a specified time, and a distributed account book which is not falsifiable and is shared by all members is formed in a cryptographic mode. The blockchain processing system is a database for storing data, and records data such as transactions in the database. Each block may participate in the accounting process of the ledger. The data of any node is changed and effective, and the data of all nodes on the whole network can be synchronously changed, so that the consistency of the data of all nodes is ensured.

In the field of the design of the whole frequency converter, the integrity of each component can be well ensured by using a block chain technology, and the intellectual property protection is enhanced. For example, each component of the frequency converter is respectively used as a block, the production information of each component and the corresponding frequency converter data are recorded on each node by using distributed accounting of a block chain, and the use of each component of the frequency converter system is controlled by using the non-tampering guarantee of the data. Because the operation of the frequency converter system does not depend on data in the block chain, whether the components of the frequency converter system are changed during the operation is not confirmed, namely the integrity of the components cannot be confirmed, and potential safety hazards exist.

The invention aims to provide a control system of a frequency converter, which can ensure the integrity of each component of the frequency converter system during operation and improve the safety of the frequency converter system.

Disclosure of Invention

The invention provides the following technical scheme:

the first technical proposal is a control system of a frequency converter, which is characterized by comprising a man-machine interface (10), a main controller (20), a signal interface component (30) and a driving unit (40),

the frequency converter (60) comprises a plurality of power units connected in series, and an output current is generated through the on and off of the power units,

the main controller (20) exchanges data with the outside through the man-machine interface (10) and receives parameter setting, the main controller (20) is connected with the upper computer (50) through the signal interface component (30), the main controller (20) generates a control instruction for controlling the frequency converter (60),

the driving unit (20) corresponds to the power unit, generates a driving signal according to the control instruction, drives the switch element in the power unit to be switched on and off,

the man-machine interface (10), the main controller (20), the signal interface component (30) and the drive unit (40) at least comprise key storage modules (10a, 20a, 30a, 40a), key verification modules (10b, 20b, 30b, 40b) and key exchange modules (10c, 20c, 30c, 40c) as components,

a key is stored in each of the key storage modules (10a, 20a, 30a, 40a),

each component exchanges keys with other components through the key exchange modules (10d, 20d, 30d, 40d), and the key verification modules (10b, 20b, 30b, 40b) in each component verify the correctness of the keys stored in the key storage modules (10a, 20a, 30a, 40a) according to the received keys.

A second technical solution is based on the first technical solution, and is characterized in that, when the power is turned on, each component reads the key storing module (10a, 20a, 30a, 40a), the key exchanging module (10d, 20d, 30d, 40d) exchanges the key with other components, the key verifying module (10b, 20b, 30b, 40b) in each component verifies the correctness of the key storing module (10a, 20a, 30a, 40a) according to the received key, and when the verification of all the components passes, the frequency converter enters the standby mode.

A third technical solution is based on the first technical solution, and is characterized in that the secret key uses a specific character string, which includes a product batch number, a production date, and a cyclic redundancy check code of the frequency converter.

The fourth technical solution is based on the third technical solution, and is characterized in that the frequency converter has a unique identifier, the identifier is managed in a block chain accounting manner, and the secret key is a private key for signing the transaction.

A fifth technical solution is based on any one of the first to fourth technical solutions, and is characterized in that each of the components further includes a key update module (10d, 20d, 30d, 40d), after the human-machine interface (10) or the signal interface component (30) receives a key update instruction, the key exchange module (10c, 20c, 30c, 40c) sends a new key to the other components, and the key update module (10d, 20d, 30d, 40d) in each of the components updates the key in the key storage module (10a, 20a, 30a, 40a) according to the received new key.

A sixth technical means is based on the fifth technical means, and is characterized in that after the key updating module (10d, 20d, 30d, 40d) of each component updates the key, the key exchange module (10d, 20d, 30d, 40d) exchanges the key with the other components, the key verification module (10b, 20b, 30b, 40b) in each component verifies and stores the correctness of the key in the key storage module (10a, 20a, 30a, 40a) according to the received key, and when the verification of all the components passes, the completion of the key updating is confirmed.

A seventh technical solution is based on the sixth technical solution, and is characterized in that when at least one component fails to pass the verification, the key update fails, and the master controller (20) reports a failure and stops working.

An eighth technical solution is based on the fifth technical solution, and is characterized in that the human-machine interface (10) is connected with a cloud platform and receives a key update instruction sent by the cloud platform.

The tenth technical scheme is based on the fifth technical scheme and is characterized in that the signal interface component (30) is connected with the upper computer (50) and receives the key updating instruction sent by the upper computer (50).

The technical effects are as follows:

when the frequency converter is powered on, each component can read and store the key of the key storage module (10a, 20a, 30a, 40a), the key exchange module (10d, 20d, 30d, 40d) exchanges keys with other components, the key verification module (10b, 20b, 30b, 40b) in each component verifies and stores the correctness of the key in the key storage module (10a, 20a, 30a, 40a) according to the received key, and when the verification of all the components passes, the frequency converter enters a standby mode. Therefore, when the assembly is replaced, the frequency converter cannot enter a standby mode, the safety of the frequency converter is greatly ensured, and the high-frequency-conversion-efficiency frequency converter has high practicability and operability. The overall management of the frequency converter system can be enhanced through software design without increasing extra hardware cost.

Drawings

FIG. 1 is a schematic diagram of the overall structure of a frequency converter system;

FIG. 2 is a block diagram of the key-dependent portion of the host controller;

FIG. 3 is a diagram illustrating key exchange between components in a frequency converter system;

FIG. 4 is a flow chart of the control system when the frequency converter system is powered on;

FIG. 5 is a diagram illustrating the acceptance of a rekeying instruction by a human machine interface;

FIG. 6 is a diagram illustrating a signal interface component receiving a rekeying instruction;

FIG. 7 is a flow chart of the updating of the keys of the components.

Detailed Description

In the following detailed description of the preferred embodiments of the invention, reference is made to the accompanying drawings that form a part hereof, and in which is shown by way of illustration, specific features of the invention, such that the advantages and features of the invention may be more readily understood and appreciated. The following description is an embodiment of the claimed invention, and other embodiments related to the claims not specifically described also fall within the scope of the claims.

Fig. 1 is a schematic diagram of the overall structure of a frequency converter system, and as shown in fig. 1, the frequency converter system is composed of a frequency converter 60, a human-machine interface 10, a main controller 20, and a driving unit 40.

The inverter 60 is composed of an isolation transformer 61 and a three-phase inverter 61, and each phase of the three-phase inverter 61 is formed by connecting 6 power cells (a1 to a6, B1 to B6, and C1 to C6) in series. Each power unit is connected with the secondary winding of the isolation transformer. Each power unit is provided with a driving unit 40 for driving.

The main controller 20 generates a control command, and the driving unit 20 generates a driving signal according to the control command to drive the switching elements in the power unit to turn on and off.

The main controller 20 exchanges data with the outside, for example, a human-machine interface through the human-machine interface 10, receives parameter settings, and is connected to the upper computer 50 through the signal interface assembly 30.

The man-machine interface 10, the main controller 20, the signal interface component 30 and the driving unit 40 are used as main components of the frequency converter system and have a key existence function, a key verification function, a key updating function and a key exchange function besides the functions of the main components.

Fig. 2 is a block diagram showing the structure of a key-dependent part of the main controller.

As shown in fig. 2, the main controller 20 includes a key storage module 20a, a key verification module 20b, a key exchange module 20c, and a key update module 20 d.

Like the main controller 20, the human-machine interface 10 includes a key storage module 10a, a key verification module 10b, a key exchange module 10c, and a key update module 10 d.

The signal interface assembly 30 includes a key storage module 30a, a key verification module 30b, a key exchange module 30c, and a key update module 30 d.

The drive unit 40 includes a key storage module 40a, a key verification module 40b, a key exchange module 40c, and a key update module 40 d.

And keys are stored in the key storage modules of the components. The components exchange keys with other components through a key exchange module as shown in fig. 3. And the key checking module in each component checks the correctness of the key stored in the key storage module according to the received key.

The frequency converter system in this embodiment has a unique identification, which is managed by a block chain accounting method, and the key stored in each key storage module is a private key for signing a transaction.

In this embodiment, the key uses a specific character string, and the data includes the product lot number, the production date, and the cyclic redundancy check code of the frequency converter. The key may be unique.

Fig. 4 is a flowchart of the control system when the frequency converter is powered on.

When the frequency converter is electrified, each component is electrified for self-checking.

In step S22, each component reads the key stored in the key storage module and performs key exchange with the other components.

Step S23, the human-machine interface 10 performs key verification: and (3) checking whether the key of the main controller 20, the signal interface group 30 and the drive unit 40 is consistent with the key of the man-machine interface 10, if not, checking fails, entering step 28, reporting a fault, if so, checking passes, and entering step 24.

In step S24, the main controller 20 performs key verification: and (4) verifying whether the keys of the human-machine interface 10, the signal interface group 30 and the drive unit 40 are consistent with the key of the main controller 20, if not, verifying to be failed, entering step 28, reporting a fault, and if so, verifying to be passed, and entering step 25.

In step S25, the signal interface component 30 performs key verification: and (3) verifying whether the keys of the man-machine interface 10, the main controller 20 and the drive unit 40 are consistent with the signal interface assembly 30, if not, verifying to be failed, entering step 28, reporting a fault, if so, verifying to be passed, and entering step 26.

In step S26, the drive unit 40 performs key verification: and (3) verifying whether the keys of the man-machine interface 10, the main controller 20 and the signal interface assembly 30 are consistent with the drive unit 40, if not, verifying to be failed, entering step 28, reporting a fault, if so, verifying to be passed, and entering step 27.

And step S27, after all the components pass the verification, self-checking is finished, and the frequency converter enters a standby state.

And step 28, the self-checking fails, for example, fault information is displayed on a control interface of the frequency converter.

When the frequency converter is powered on, the components mutually verify the key at first, and only if the key verification is passed, the standby mode is entered. Any one component is replaced, the frequency converter cannot enter a standby state, and the safety of the frequency converter and intellectual property of a frequency converter manufacturer are guaranteed.

The updating of each component key is explained below.

The secret key needs to be updated when the product is delivered from a factory or maintained, and can be updated regularly through the cloud platform. For example, when a product leaves a factory, keys are updated according to the frequency converter batches, so that the keys of the frequency converters in different batches are not compatible with each other and have uniqueness.

The key update of the components may be done through a variety of channels. Fig. 5 is an explanatory diagram of the case where the human machine interface accepts the key update instruction.

In fig. 5, the man-machine interface 10 is used as a port to receive a key update instruction. The key updating instruction can be sent out when the factory is updated, the field is updated or the cloud platform is updated. After the human-machine interface 10 receives the key updating instruction, the key updating module 10d updates the key in the key storage module 10a according to the new key included in the received updating instruction. And at the same time, the new key is downloaded to other components such as the main controller 20, the signal interface component 30, the drive unit 40, etc., and the key update modules in the other components update the keys stored in the respective key storage modules with the new key. Therefore, after the man-machine interface 10 receives the key updating instruction, the keys of other components are replaced at the same time, and the keys in the components are ensured to be the same.

Fig. 6 is an explanatory diagram of the signal interface component when receiving the key update instruction.

In fig. 6, the signal interface module 30 is used as a port to receive a key update command from the host computer 50. After the signal interface component 30 receives the key updating instruction, the key updating module 30d updates the key in the key storage module 30a according to the new key included in the received updating instruction. And simultaneously downloading the new key to other components such as the main controller 20, the man-machine interface 10, the drive unit 40 and the like, wherein the key updating modules in the other components update the keys stored in the respective key storage modules by using the new key. Therefore, after the signal interface component 30 receives the key updating instruction sent by the upper computer 50, the keys of other components are replaced at the same time, and the keys in the components are ensured to be the same.

The following describes the key update by taking the man-machine interface 10 as an example.

FIG. 7 is a flow chart of the updating of the keys of the components.

After receiving the key update command, the human-machine interface 10 proceeds to step 52.

In step S52, the initial key is verified, each component exchanges keys with other components through the key exchange module, and when all the component keys are consistent, the verification is passed, and the process proceeds to step S53.

In step S53, the human-machine interface 10 updates the existing key with the new key in the key update command, and after the human-machine interface key update (step S53) is completed, the key is issued to other components.

In step S54, the main controller 20, the signal interface module 30, and the drive unit 40 perform key updating, and after the key updating is completed, the process returns to step S52 to perform a key updating self-check.

The frequency converter control device provided by the invention has the advantages that the extra hardware cost is not required to be increased, the integrity of a frequency converter system can be enhanced through software design by using the key of the block chain, the components are prevented from being replaced, the safety of the frequency converter is greatly ensured, and the normal operation of the frequency converter is not influenced in operation, so that the frequency converter control device has strong practicability and operability.

The components in the frequency converter system have high compatibility, and once an unauthorized component is used, the compatibility between the component and other components in the frequency converter can be affected, and the reliability and safety of the frequency converter are affected.

Due to the frequency converter control device, when the component is replaced, the frequency converter cannot be started normally, and the safety of a frequency converter system is effectively ensured.

It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims.