KR101748969B1

KR101748969B1 - Arrangement for the protection of electronic assemblies

Info

Publication number: KR101748969B1
Application number: KR1020150185746A
Authority: KR
Inventors: 슈테판 워커; 필립 크라우츠; 마리오 렌츠
Original assignee: 한온시스템 주식회사
Priority date: 2015-06-23
Filing date: 2015-12-24
Publication date: 2017-06-19
Also published as: DE102015110064A1; DE102015110064B4; KR20170000314A

Abstract

A problem underlying the present invention relating to an electronic assembly protection device is to filter the fault components of the supply voltage applied to the input side as much as possible and to supply the electronic assembly, To provide a direct current component of the voltage, in which case the expenditure associated with cost and installation space and the complexity associated with the circuit is reduced. The above problem is solved by a transformer in which the input part is connected to the first connection terminal of the first winding of the transformer and the output part is connected to the second connection terminal of the first winding of the transformer, A second capacitor is disposed between the second connection terminal of the first winding and the reference potential, and a second winding of the transformer is connected to the ohmic resistor.

Description

TECHNICAL FIELD [0001] The present invention relates to an electronic assembly protection device,

The present invention relates to an electronic assembly protection device comprising an input for applying an input voltage, an output for providing an output voltage, and capacitive, inductive and ohmic resistors.

In order to operate the electronic assemblies, an operating voltage has to be provided, which is related not only to the deviation between the nominal value and the operating voltage, but also to the quality of the operating voltage associated with the ripple and fault components It must also correspond to the requirements given in advance. This requirement is essential to ensure barrier-free operability of the electronic assembly, for example, to protect the assembly from damage due to short-term overvoltage. Also, electrically operated assemblies must be prevented from causing many unacceptable electromagnetic interferences, such electromagnetic interferences may again interfere with other assemblies and cause malfunctions.

An electronic assembly refers to any assembly provided with a supply voltage, which may include a plurality of active and / or passive electronic components. Such types of assemblies can be used in any machine, for example in the area of control and feedback control systems. For example, an apparatus of this type is an electronic assembly for driving an electric refrigerant compressor.

The present invention relates to assemblies for filtering fault components of the operating voltage, also referred to as electromagnetic compatibility (EMC-Filter).

The EMC filter is used to damp the disturbances that may affect the conduct disturbance at the amplitude, for example through the supply lines of the assemblies. Furthermore, situations in which faults that occur within the electrical assembly, such as those that may occur due to sudden switching operations, can act on the environment outside the assembly via the power cord should also be avoided. If there are a number of supply lines or connection lines required for the assembly, one EMC filter should be provided for each supply line or connection line, as the case may be.

In such cases, compliance with electromagnetic compatibility requirements is specified by corresponding norms and test guidelines.

The signals filtered by the EMC filter may have a characteristic curve of the fault component on both the low frequency side and the high frequency side. Such signals may occur not only with a common-mode signal but also with a differential mode signal. In the worst case, insufficient EMC filtering can cause malfunctions of electronic components and assemblies or even damage the electronic components and assemblies.

For this reason, devices are used for protecting the electronic assemblies for the purpose of complying with the electromagnetic compatibility of the electrical assemblies. These devices are also referred to as EMC filters. In order to prevent resonant oscillation, the EMC filters must be partially damped. Such vibrations may occur due to unintended interactions between the energy storage devices (capacitors, induction coils), and when such unintended interactions occur, they may occur in the filter itself or in other electrical components Resulting in a surge in current between them. In addition, the operating bandwidth can be increased due to the reduction in the filter quality index due to the damping of the EMC filter adapted to the specific purpose as described above.

The EMC filters are connected on the input side to a supply voltage specified for the electronic assembly to be protected and on the output side to the operating voltage input of the electronic assembly itself. As described above, the conductive failure is prevented in advance by the method of disposing the EMC filter in advance.

Damping of the EMC filter is usually done by one or more damping resistors. The above damping resistors disposed in the EMC filter generate ohmic losses, that is, heat to be discharged.

This resistance loss occurring within the EMC filter also occurs when only a pure DC component, that is, only a DC voltage that does not have all the fault components to be filtered passes through the EMC filter. For this reason, resistors must be sized to the corresponding sizes in relation to the allowed power dissipation.

This situation again negatively affects the damping resistor requirements and the overall cost of the EMC filter or electrical assembly. Also, the overall efficiency of the electrical assembly is reduced due to power loss.

Therefore, an object of the present invention is to filter the fault component of the supply voltage applied to the input side as much as possible and to supply the faultless direct current component of the supply voltage with the minimum possible loss to the electronic assembly installed after the power is supplied , And a reduction in cost and circuit space related consumption and associated circuit complexity.

The above object is solved by an object having the features of claim 1. Improvements are set forth in the dependent claims.

The electronic assembly protection device can be designed in such a way that the primary winding of a transformer, for example, is inserted between the input and output parts in a series circuit of the device. In addition, the secondary winding of the transformer may be connected to the ohmic damping resistor and accordingly damped. The device further comprises a first capacitor and a second capacitor, wherein the first capacitor is disposed between an input of the device and a reference potential / ground, and the second capacitor is between the output of the device and a reference potential Respectively.

The primary winding of the transformer is used as an induction coil to remove a disturbing signal component. In the electronic assembly protection device, the direct current component can pass through the device without damping, while the failing alternating voltage component becomes possible to be filtered by the self inductance of the transformer and the capacitive action of the capacitor.

It is preferred that the primary winding of the transformer is a primary winding while the secondary winding of the transformer is formed of a secondary winding.

Further, it is preferable that the two windings of the transformer are galvanically separated from each other. This separation reduces the insulation complexity on the secondary winding side of the transformer.

It is also desirable to connect the secondary winding side ohmic resistor of the transformer to a heat sink. Whereby the damping resistor as described above can be cooled. For example, the housing of the electric refrigerant compressor may also mean a heat sink as described above.

In addition, it is also preferable that the input unit and the output unit of the electronic assembly protecting apparatus are designed to be different from each other. In this way, it becomes possible to operate the apparatus with a differential signal or a differential voltage.

Further details, features and advantages of the formation examples of the present invention are set forth in the following description of embodiments cited with reference to the accompanying drawings.

Figure 1 is an exemplary embodiment of an EMC filter of the prior art,
2 is an exemplary embodiment of an apparatus (EMC filter) according to the present invention for electronic assembly protection, and
3 is an exemplary embodiment of an apparatus (EMC filter) according to the present invention for protection of an electronic assembly having a differential designed input and output.

1 shows an exemplary EMC filter having an input 1 and an output 2, which is known in the prior art, in which an input voltage U _e is applied to the input, A maximum reduced output voltage (U _a ) is provided. The filter is designed as a so-called PI filter having a first capacitor 4 and a second capacitor 5 in an inductor 3 and shunt circuits in a series circuit. In addition, the EMC filter has a plurality of resistors 6 for damping. These resistors 6 can also be used one by one in one filter.

Alternatively, EMC filters of this type may be formed in any combination of capacitors, inductors and resistors in a known manner.

2, an EMC filter according to the present invention is shown as an exemplary embodiment. The EMC filter according to the present invention also has an input part 1 to which an input voltage U _e is applied and an output part 2 to which an output voltage U _a is supplied.

In the shunts of the apparatus, a first capacitor 4 is arranged on the input side and a second capacitor 5 is arranged on the output side. In the present invention, for example, the primary winding 10 of the transformer 7 can be inserted between the input section 1 and the output section 2 as a primary winding.

The primary winding 10 of the transformer 7 is used as an inductive coil for filtering the fault signal. As shown in Fig. 2, a resistor 6 for damping the filter is connected to the second winding 11, which is the secondary winding 11 of the transformer 7. The direct current component can pass through the primary winding 10 or the filters of the transformer 7 without damping and loss. The failing AC voltage component is filtered by the self inductance of the transformer 7 and by the connected capacitors 4 and 5.

At the same time, the filter is damped by the damping resistor 6 on the secondary winding 11 side. Since the damping resistor 6 only has to damp only the disturbance component through the circuit according to the present invention, the requirements relating to the power loss, overall size and cooling of the damping resistor 6 can be alleviated. The transmission rate of the transformer 7, which is determined by the ratio of the number of coils of the primary winding 10 of the transformer 7 to the number of coils of the secondary winding 11 of the transformer 7, The selectivity of the resistance value of the resistor 6 gives an additional degree of freedom in device design.

In addition, the galvanic electrical separation 8 of the primary, primary 10 and secondary 11 windings by the transformer 7 enables a simple yet electrically safe connection of the damping resistor 6 and the heat sink 9 . As a result, the insulation pad of the heat sink can be omitted, and at the same time, the thermal contact resistance between the damping resistor 6 and the cooling surface of the heat sink 9 can be improved.

The damping resistor 6 can be actively cooled by being connected to the housing of the refrigerant compressor, which means the heat sink 9, in the exemplary mounting of the electronic assembly protection device, for example in an inverter of an electric refrigerant compressor. As a result, the total size of the damping resistor 6 can be further reduced.

Figure 3 shows a filter arrangement according to the invention for a differential designed EMC filter. In this case, the first winding 10 of the known induction coil (common mode choke) was supplemented with an additional third winding 12. In the second winding 11 already known in Fig. 2, a resistor 6 for damping is inserted similarly to Fig. The working principle corresponds to the situation already described in Fig.

Due to the differential structure of the EMC filter, the capacitor 4a is arranged corresponding to the first capacitor 4, the capacitor 5a is arranged corresponding to the second capacitor 5, The capacitors 4a and 5a function as so-called Y-shaped capacitors. Further, the EMC filter is extended by one additional capacitor 13 on the input side and the output side, respectively, and the additional capacitors 13 function as X-shaped capacitors.

The damping resistors 6 known in Fig. 2 may also be used in this embodiment. These resistors are omitted in the drawing of Fig.

1: Input part of the EMC filter (input voltage (U _e ))
2: Output of the EMC filter (output voltage (U _a ))
3: Inductor
4: first capacitor / first capacitive resistor
5: second capacitor / second capacitive resistor
6: Damping Resistor / Ohm Resistor
7: Transformer
8: Electrical insulation (galvanic isolation)
9: Heatsink
10: Primary winding / primary winding of transformer
11: Secondary winding / secondary winding of the transformer
12: Third winding
13: Additional Capacitors

Claims

An input unit 1 for applying an input voltage;
An output section (2) for providing an output voltage; And
An electronic assembly protection device comprising: at least one of a capacitive element, an inductive element, and an ohmic element,
The input section 1 is connected to the first connection terminal of the first winding 10 of the transformer 7 and the output section 2 is connected to the second connection 10 of the first winding 10 of the transformer 7, And the first capacitor 4 is disposed between the first connection terminal of the first winding 10 and the reference potential and the second capacitor 5 is connected to the first terminal of the first winding 10 And a second winding (11) of the transformer (7) is connected to the ohmic resistor (6)
Wherein the input section 1 is a differential input and the output section 2 is a differential output and a third winding 12 is connected between the input section 1 and the output section 2. [ Is arranged on the surface of the substrate
Electronic assembly protection device.

The method according to claim 1,
Characterized in that said first winding (10) is a primary winding of said transformer (7) and said second winding (11) is a secondary winding of said transformer (7)
Electronic assembly protection device.

3. The method according to claim 1 or 2,
Characterized in that the first winding (10) and the second winding (11) are galvanically separated from each other.
Electronic assembly protection device.

3. The method according to claim 1 or 2,
Characterized in that an ohmic resistor (6) connected to the second winding (11) of the transformer is connected to a heat sink (9)
Electronic assembly protection device.

delete

3. The method according to claim 1 or 2,
Characterized in that an ohmic resistor (6) connected to the second winding (11) of the transformer (7) is connected to a housing of an electric refrigerant compressor for active cooling.
Electronic assembly protection device.