DE102017116109A1 - Control electronics for refrigeration systems - Google Patents

Abstract

The invention relates to a control electronics for refrigeration systems with refrigeration components (K1, ..., Kn) comprising a central electronic control module (10) with a rectifier (11) and a DC link capacitor (12) and a plurality of power amplifiers (13) which the refrigeration components (K1, ..., Kn) on the voltage side at interfaces (S) can be connected, wherein the respective output stages (13) on the input side via the shared DC link capacitor (12) to the shared rectifier (11) are connected and the interfaces (S) are connected to control technology with a central interface controller (20).

Description

The invention relates to an electronic control system for refrigeration systems.

The refrigeration technology is no longer used exclusively for cooling storage rooms. Rather, cooling is used in modern buildings, facilities, factories or processes to produce certain climatic conditions. The demands on the control system control and the performance of the refrigeration system are meanwhile, also due to the changed environmental legislation and the associated new refrigerant, so broad that a complex (much comprehensive) range of refrigeration components and systems to solve the refrigeration tasks available stands. The control and design of such a refrigeration system is therefore of particular importance.

From the DE 202016106910 U1 a concept concerning the EMC enclosure of a cooling device is known. For this purpose, this cooling device comprises a metallic and / or electrically conductive EMC housing and a converter as well as a plurality of electrically operated units within the EMC housing, which are designed to influence a local temperature in at least one area inside or outside the EMC enclosure, wherein the Inverter supplied directly to at least one or more of the units with a respective supply voltage and wherein the inverter and the units are each designed so that the specifically generated by this unit during operation of the cooling device conducted and / or field-bound EMC interference by a line-bound and / or field-bound interference of at least one of the other units is partially or completely compensated in their respective noise level.

The DE 10 2015 108 910 A1 relates to a cooling device, in particular for the cooling of components housed in a control cabinet, with a first fan for the flow of a first heat exchanger with cabinet air and with a second fan for the flow of a second heat exchanger with ambient air, the cooling device, a power supply with an upward and / or buck converter, which is connected via a rectifier with a wide-range input for single or multi-phase AC voltage and charges a capacitor to an intermediate circuit voltage, which is above or below a voltage applied to the wide-range input mains voltage, wherein a power supply at least one of the two fans connected in parallel with the capacitor.

Typically, the individual components are purchased to realize a refrigeration system control. The disadvantage here is that this results in high costs, since each of the components used, which requires EMC protection also has its own EMC filter. Furthermore, for each technical component, such. B. participating fans, compressors, electric motors, etc. each own rectifier, DC link capacitor, DC / DC converter and the like required to produce the required operating voltage for each of the components.

Another disadvantage arises from the required networking (communication) of the components, which often turns out to be difficult, since there are no uniform standards for this. In addition, the space required in the overall device (refrigeration system) is therefore large and also creates a high assembly cost of the individual electrical and electronic components.

The invention is therefore based on the object to overcome said disadvantages and to provide a controller or control electronics for refrigeration systems, in which the number of components is reduced and at which the refrigeration components share certain electronic units or can share them.

This object is achieved by the feature combination according to claim 1.

A basic idea of the invention lies in the fact that the control and / or regulation electronics for refrigeration systems are at least partially functionally integrated in a common control module unit, including in particular an integrative design of a plurality of components is provided and these are combined with an interface controller.

According to the invention for this purpose an electronic control system for refrigeration systems with refrigeration components proposed, comprising a central electronic control module with a rectifier and a DC link capacitor and a plurality of power amplifiers to which the refrigeration components can be connected on the voltage side interfaces of the control module, wherein the respective power amplifier for refrigeration Systems are connected on the input side via the shared DC link capacitor to the shared rectifier and the interfaces are further connected control technology with a central interface controller.

According to the invention, the central electronic control module has an interface controller which can be connected on the output side to all components for the refrigeration cycle on the central electronics without electrical isolation via a simple serial interface (eg PWM or I ² C).

In an advantageous embodiment of the invention, the interface controller can be galvanically isolated on the input side with a refrigeration cycle controller or else not galvanically isolated via a serial interface and / or with external signal generators z. B. connected to temperature or pressure sensors.

It is also advantageous if the electronic control module also has a shared EMC filter in front of the voltage intermediate circuit, which is preferably provided on the input side between the rectifier and an input for a single-phase or three-phase mains supply with a supply voltage supply.

In a likewise advantageous embodiment of the invention, it is provided that the electronic control module further comprises a jointly used boosters and / or boosters, which is preferably arranged in the circuitry between the rectifier and the DC link capacitor in the voltage intermediate circuit.

It is also advantageous if the electronic control module moreover also has a touch-safe DC / DC low-voltage supply for providing a SELV voltage for commutation electronics of the components to be commutated, such as the electric motors, electronically controllable valves or other units of the refrigeration components to be commutated.

In a further advantageous embodiment of the invention, it is provided that the electronic control module has an interface for an integratable or external refrigeration cycle controller. For a particularly compact design of the refrigeration cycle controller with or without an integrated control module in the control panel, display and / or interfaces for connecting a sensor and / or for connecting control elements such. B. valves, be formed.

The control electronics is configured in a preferred embodiment so that the output stages for the connection of the cooling components are designed as DC / AC converter. So z. For example, fans, cooling compressors or the motors required for this purpose can be connected directly to the DC / AC converter via EMC input filters.

It is further advantageous in this context if the respective output stages or DC / AC converters are each connected to the interface controller via a respective microcontroller so that in each case a microcontroller is associated with the connected components such as compressors, fans and the like in terms of control technology.

Furthermore, it can advantageously be provided that the interface controller is connected on the input side via a serial interface to a, a commutation controlling microcontroller via a galvanic isolation.

Another aspect of the present invention relates to a refrigeration system comprising a plurality of refrigeration components (compressors, fans, ventilators, etc.) equipped with control electronics as described above.

• 1 ein Blockschaltbild einer beispielhaften Ausführung einer erfindungsgemäßen Steuerungselektronik.

Other advantageous developments of the invention are characterized in the subclaims or are shown in more detail below together with the description of the preferred embodiment of the invention with reference to FIGS. It shows:

• 1 a block diagram of an exemplary embodiment of a control electronics according to the invention.

In the 1 is a block diagram of an embodiment of an electronic control system for refrigeration systems for the operation of the illustrated refrigeration components ( K1 . K2 . K3 , ...) shown.

The control electronics comprises a central electronic control module 10 , which is formed with a DC voltage intermediate circuit. These are a rectifier 11 , a DC link voltage adjustment 16 and a DC link capacitor 12 intended.

The DC link voltage adaptation 16 represents a shared Hochsteller and / or Tiefsteller. At the output of the common DC voltage intermediate circuit is thus the intermediate circuit voltage for the power stages shown 13 to disposal. As can be seen in the block diagram, the connected refrigeration components ( K1 . K2 . K3 , ...) together the rectifier 11 , the EMC filter 14 , the Hochsteller and / or Tiefsteller 16 and the DC link capacitor 12 ,

The used power amplifiers 13 are designed as DC / AC converter or DC / AC power stages and provide an interface S, to which the respective refrigeration components ( K1 . K2 . K3 , ...) are connected. Exemplary is shown as the refrigeration component K3 namely, the fan 2 , already at the interface of the illustrated power amplifier 13 connected.

The power amplifiers 13 are with a central interface controller 20 control technology via the respective microcontroller 18 connected.

The electronic control module 10 also has the shared EMC filter 14 on, the circuit side input between the rectifier 11 and an entrance 15 is provided for a mains voltage supply U _n .

Furthermore, has the control electronics 10 a touch-safe DC / DC low voltage power supply 17 for providing a SELV voltage for commutation electronics of the commutated motors M and valves or for other plant components.

The electronic control module shown 10 also has an integrated refrigeration cycle controller 24 on that with a display 21 connected is. the display 21 can be configured simultaneously via input functions as a control panel. Communication with sensors or other components may be via a bus protocol, such as. B. the Modbus done.

In the present embodiment, the refrigeration components ( K1 . K2 . K3 , ...), thus the compressor and the two exemplarily illustrated fans (fan 1 and fans 2 ) each have their own EMC input filter 22 ,

The interface controller 20 is also the input side via a serial interface with a commutation K controlling microcontroller 18 connected via a galvanic isolation T.

The invention is not limited in its execution to the above-mentioned preferred embodiments. Rather, a number of variants is conceivable, which makes use of the illustrated solution even with fundamentally different types of use, so it may be technically advantageous from a load or fan performance of the connected components of about 200 watts, the power section of the commutation in each case in the engine and to supply the component with high-voltage direct voltage (eg 320V - 420V DC) from the common DC link. For this purpose, it can also be provided that there are bypass connections to the intermediate circuit, which is a connection of the components K1 . K2 . K3 , ... at the respective power levels 13 of the control module 10 over, directly on the DC link.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 202016106910 U1 [0003]
• DE 102015108910 A1 [0004]

Claims (10)

Control electronics for refrigeration systems with refrigeration components (K1, ..., Kn) comprising a central electronic control module (10) with a rectifier (11) and a DC link capacitor (12) and a plurality of power amplifiers (13) to which the refrigeration components (K1, ..., Kn) can be connected on the voltage side to interfaces (S), wherein the respective output stages (13) are connected on the input side via the shared DC link capacitor (12) to the shared rectifier (11) and the interfaces (S ) are connected to a central interface controller (20) control technology. Control electronics after Claim 1 , characterized in that the electronic control module (10) further comprises a shared EMC filter (14), the circuitry is preferably provided on the input side between the rectifier (11) and an input (15) for a mains voltage supply (Un). Control electronics after Claim 1 or 2 , characterized in that the electronic control module (10) further comprises a shared Hochsteller and / or Tiefsteller (16), which is preferably arranged in terms of circuitry between the rectifier (11) and the intermediate circuit capacitor (12). Control electronics according to one of Claims 1 to 3 characterized in that the electronic control module (10) further comprises a touch-safe DC / DC low voltage supply (17) for providing a SELV voltage for commutation electronics of the commutated motors (M), valves or other units of the refrigeration components (K1, ..., Kn). Control electronics according to one of Claims 1 to 4 , characterized in that the electronic control module (10) has an interface for an integrable or external refrigeration cycle controller. Control electronics according to one of the preceding claims, characterized in that the output stages (13) are designed as DC / AC converter. Control electronics according to one of the preceding claims, characterized in that the respective output stages (13) are further connected via a microcontroller (18) with the interface controller (20) control technology. Control electronics according to one of the preceding claims, characterized in that the interface controller (20) on the input side via a serial interface with a commutation electronics (K) controlling microcontroller (18) via a galvanic isolation (T) is connected. Refrigeration plant comprising a plurality of refrigeration components (K1, ..., Kn), with the control electronics according to one of Claims 1 to 8th connected via the interfaces (S). Refrigeration plant after Claim 9 , wherein at least two of the refrigeration components (K1, ..., Kn) represent either a fan, a compressor, a fan or other component having an electric motor.

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