SK8931Y1 - Hardware protection of the converter module systems - Google Patents

Abstract

The hardware protection of the converter module systems consists of a constant current source (3), a processor (4), a converter (1) that includes an output optocoupler (5), an evaluation block (6), an input optocoupler (7) , an input logic (8), a converter (2) comprising an output optocoupler (9), an evaluation block (10), an input optocoupler (11), and an input logic (12). The hardware protection of the modular drive systems acts as a master protection of the entire system consisting of a combination of multiple converters.

Description

Technical field

The subject of the utility model is the hardware protection of modular inverter systems. The technical solution falls into the field of power electronics, especially the protection of inverter systems consisting of a combination of several inverters.

Prior art

The ever-increasing demands on the functionality, complexity, mobility and, of course, the safety of inverter systems are leading to the increasing complexity of these devices. The complexity of these modular drive systems often also affects the complexity of the protection circuits themselves. Today, individual inverters already have standard types of protections, such as voltage, current, thermal and others. In systems where several inverters (also of different types) operate simultaneously, extensive problems arise in distinguishing the operating states of the individual inverters and the system as a whole from the fault states of the individual inverters or the unit. A failure of one inverter may or may not lead to a failure of the entire system. Due to the complexity of these devices, both hardware and software protections are already used in the individual inverters. Hardware protections are based on protection elements (current and thermal fuses, overvoltage elements, etc.), software uses logic states and measured data to evaluate the current situation of the inverter. The protections of systems consisting of a combination of several inverters (including different types) must reliably distinguish between operating and fault conditions, either of individual inverters or of the system as a whole. They are most often implemented using software that evaluates all logical states as well as measured data in real time. However, the growing complexity of these devices causes the number of logic signals and measured data to increase, which may lead to a situation where software protection will not be able to evaluate all data in time and thus an emergency may occur in the device that cannot be detected in time by software protection.

The essence of the technical solution

This disadvantage is eliminated by the presented technical solution - hardware protection of modular systems of converters, the principle of operation of which guarantees a shorter reaction time and at the same time the higher reliability of the protection of the device.

The hardware protection of modular drive systems consists of three parts.

The first part is a constant current source that supplies a series of optical elements.

The second part consists of the system of optical elements, on which they evaluate the individual states of the system on the basis of input states. Each individual converter of the system is connected to a separate serial system of two optical elements, while one - input optical member determines the state of the given converter and the other - output optical member evaluates it. The series connection of these optical elements advantageously takes advantage of the fact that as soon as any of the individual converters is in an error state, this series circuit-series system of optical elements is interrupted, which in turn evaluates all protection evaluation blocks as an error state.

The last part consists of the control processor itself, which contains the hardware evaluation logic, which evaluates these states from the evaluation blocks and responds appropriately based on the detected state - it blocks further activity of the system. After the subsequent evaluation (and elimination) of the error by the parent system, the entire system can be re-enabled.

An advantageous feature of hardware protection of modular systems of inverters is that it allows to connect in series any number of individual inverters forming the resulting system.

Technical solution - hardware protection of modular systems of inverters evaluates the state of each inverter separately, but subsequently also the system as a whole.

Overview of figures in the drawings

In FIG. f is a block diagram of the hardware protection of modular drive systems.

Examples of embodiments

Hardware protection of the modular converter systems according to FIG. f consists of a current source 3, which supplies the series-connected output optocoupler 5 and the input optocoupler 7 of the converter f and the series-connected output op2

SK 8931 Υ1 drive 9 and input optocoupler 11 of drive 2. The input logic 8 of drive 1 determines the status of the input optocoupler 7 of drive 1. The input logic 12 of drive 2 determines the status of the input optocoupler 11 of drive 2. The evaluation block 6 of drive 1 evaluates the status of the output optocoupler 5 of drive 1 The evaluation block 10 of the inverter 2 evaluates the state of the output optocoupler 9 of the inverter 2. The processor 4 then evaluates the state of the evaluation circuit 6 of the inverter 2 and at the same time the evaluation circuit 10 of the inverter 2, the series connection of the optocouplers of the individual inverters being interrupted in the event of a fault.

Industrial applicability

The hardware protection of modular converter systems can be suitably used in converter systems consisting of a combination of several converters, either connected in series or in parallel and working simultaneously, or in other electronic devices consisting of several subsystems operating simultaneously.

S K 8931 Υ1

List of reference marks

1 2 5 3 4 5 6 7 10 8 9 - converter 1 - converter 2 - constant current source - processor - output optocoupler - evaluation block - input optocoupler -input logic - output optocoupler

- evaluation block

- input optocoupler

- input logic

Claims (1)

CLAIMS FOR PROTECTION Hardware protection of modular inverter systems consisting of inverter (1), inverter (2), constant current source (3), processor (4), output optocouplers (5) and (9), evaluation blocks (6) and (10), 5 input optocouplers (7) and (11), input logic (8) and (12), characterized in that the output of the constant current source (3) is connected in series by means of power conductors output optocoupler (5) and input optocoupler (7) of the converter (1) and the output optocoupler (9) and the input optocoupler (11) of the converter (2), wherein the input logic (8) of the converter (1) is connected via signal wires to the input optocoupler (7) of the converter (1) to determine its state and also the input logic (12) of the converter (2) is connected via signal wires to the 10 input optocoupler (11) of the converter (2) to determine its state, at the same time the output optocoupler (5) of the converter (1) is connected for signal evaluation. the evaluation block (6) of the converter (1) and the output optocoupler (9) of the converter (2) is connected for the purpose of evaluating their condition by means of by means of signal wires to the evaluation block (10) of the converter (2), the evaluation block (6) of the converter (1) and the evaluation block (10) of the converter (2) being connected to the processor (4) for controlling the whole system based on the evaluation of the states of the evaluation blocks (6) and (10).