Transformer rectifier electromagnetic compatibility circuit

Abstract

The utility model discloses a transformer rectifier electromagnetic compatibility circuit, which comprises an input line, a transformer and a rectifier bridge, a common mode inductor and a filter capacitor assembly are sequentially connected between the input line and the transformer, and the output end of the rectifier bridge is connected with a casing capacitor. According to the utility model, electromagnetic interference in the circuit can be suppressed, the capacity of a filter capacitor between input lines which is originally used for always interfering can be reduced, the volume required by the transformer rectifier is greatly reduced, the cost is low, the economical efficiency of the transformer rectifier can be further improved, and the problems of high cost and high cost during electromagnetic compatibility of the transformer rectifier are effectively solved.

Description

Technical Field

[0001] The utility model relates to the field of variable voltage rectifiers, and specifically to an electromagnetic compatibility circuit for a variable voltage rectifier. Background Technique

[0002] With the development of multi-electric / all-electric aircraft, the power supply demand has increased significantly, and the output power of the variable voltage rectifier has also increased substantially. However, the resulting electromagnetic interference has also increased significantly. Due to its own working characteristics, electromagnetic interference will be generated during the on and off instants of the internal rectifying devices of the variable voltage rectifier.

[0003] Currently, due to space and weight limitations, domestic and foreign variable voltage rectifiers can only absorb interference through capacitors. However, this kind of interference cannot be solved only by capacitor absorption. To completely solve it, a special filter needs to be installed. This kind of filter is not only bulky but also expensive, with high costs, which the variable voltage rectifier itself cannot bear. Therefore, an electromagnetic compatibility circuit for a variable voltage rectifier is proposed. Content of the Utility Model

[0004] The purpose of the utility model is to provide an electromagnetic compatibility circuit for a variable voltage rectifier to solve the problem that the existing filters for reducing electromagnetic compatibility of variable voltage rectifiers are not only bulky but also expensive and have high costs as mentioned in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] An electromagnetic compatibility circuit for a variable voltage rectifier includes an input line, a transformer, and a rectifier bridge. A common mode inductor and a filter capacitor assembly are sequentially connected between the input line and the transformer, and a capacitor to the chassis is connected to the output end of the rectifier bridge.

[0007] Further, the inductance of the common mode inductor is 100 mH - 400 mH, and this common mode inductor is used to suppress electromagnetic interference.

[0008] Further, the capacitance of the capacitor to the chassis is 2.2 μF - 4.5 μF, and this capacitor to the chassis includes capacitor C8 and capacitor C9 connected to the output end of the rectifier bridge.

[0009] Further, the filter capacitor assembly includes capacitor C4, capacitor C5, and capacitor C6, and this filter capacitor assembly is used to absorb electromagnetic interference in the circuit.

[0010] Further, the input end of the input line is connected to the aircraft power supply system, and the input end can access 115V / 200VAC.

[0011] The beneficial effects of the utility model are:

[0012] The utility model can not only suppress electromagnetic interference in the circuit by adding a common-mode inductor and a chassis capacitor, but also further reduce the capacitance of the input-line filter capacitor that was originally used to suppress interference, greatly reducing the volume required for the transformer rectifier, having low cost, and being able to further increase the economy of the transformer rectifier, effectively solving the problem of high cost and high price during the electromagnetic compatibility of the transformer rectifier, which is conducive to the popularization and use of the electromagnetic compatibility circuit of the transformer rectifier. Brief Description of the Drawings

[0013] Figure 1 It is a schematic diagram of the electromagnetic compatibility circuit of the transformer rectifier of the utility model.

[0014] In the figure: 1 input line, 2 common-mode inductor, 3 transformer, 4 rectifier bridge. Detailed Embodiment

[0015] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0016] Please refer to Figure 1 , which provides a technical solution of the present utility model. An electromagnetic compatibility circuit of a transformer rectifier includes an input line 1, a transformer 3, and a rectifier bridge 4. A common-mode inductor 2 and a filter capacitor assembly are sequentially connected between the input line 1 and the transformer 3. The input end of the input line 1 is connected to the aircraft power supply system, and the input end can access 115V / 200VAC; the mentioned filter capacitor assembly includes a capacitor C4, a capacitor C5, and a capacitor C6, and this filter capacitor assembly is used to absorb electromagnetic interference in the circuit; among them, a chassis capacitor is connected to the output end of the rectifier bridge 4, and the capacitance of the chassis capacitor is 2.2 μF - 4.5 μF. This chassis capacitor includes a capacitor C8 and a capacitor C9 connected to the output end of the rectifier bridge 4; among them, the inductance of the mentioned common-mode inductor 2 is 100 mH - 400 mH, and this common-mode inductor 2 is used to suppress electromagnetic interference.

[0017] For this electromagnetic compatibility circuit of the transformer rectifier, only by adding a common-mode inductor and a chassis capacitor, namely capacitor C8 and capacitor C9, to the circuit, interference can be suppressed, and the capacitance of the input-line capacitors C4, C5, and C6 that were originally used to suppress interference can be further reduced; according to the output power of the transformer rectifier, the inductance of the common-mode inductor can be selected within the range of 140 mH to 390 mH, and the capacitance of the chassis capacitor is recommended to be selected in the range of 2.7 μF to 4.0 μF. The above parameters can be changed according to the actual use effect, and this circuit is applicable to all types of products of the transformer rectifier.

[0018] In this embodiment, the input line 1 of the aircraft power supply system is connected to the three-phase power supply of phase A, phase B, and phase C. The input line 1 transmits the three-phase power to the common-mode inductor 2. The current passing through the common-mode inductor 2 then enters the transformer 3 after passing through the filter capacitor assembly and is transformed. After that, it is transmitted to the rectifier bridge 4 for rectification and then transmitted to the capacitance to the chassis. The voltage output after rectification is 28.5V. The electromagnetic interference caused by the on and off moments of the internal rectifying device is suppressed by the common-mode inductor 2 and the capacitance to the chassis, and the capacitances of the inter-input-line capacitance C4, capacitor 5, and capacitor C6, which were originally used to interfere all the time, can be further reduced.

[0019] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0020] The above embodiments only represent the preferred implementation modes of the present invention. The description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. In the present invention, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium. Among them, there are various detachable installation methods. For example, it can be in a way of cooperation between plugging and buckling, or in a way of bolt connection, etc.

Claims

1. A variable voltage rectifier electromagnetic compatibility circuit, characterized in that: It includes an input line, a transformer and a rectifier bridge. A common-mode inductor and a filter capacitor assembly are sequentially connected between the input line and the transformer. The output end of the rectifier bridge is connected with a chassis capacitor.

2. The electromagnetic compatibility circuit of the transformer rectifier according to claim 1, characterized in that: The inductance of the common-mode inductor is 100 mH - 400 mH, and this common-mode inductor is used to suppress electromagnetic interference.

3. The electromagnetic compatibility circuit of the transformer rectifier according to claim 1, characterized in that: The capacitance of the chassis capacitor is 2.2 μF - 4.5 μF. This chassis capacitor includes capacitor C8 and capacitor C9 connected to the output end of the rectifier bridge.

4. The electromagnetic compatibility circuit of the transformer rectifier according to claim 1, wherein: The filter capacitor assembly includes capacitor C4, capacitor C5 and capacitor C6, and this filter capacitor assembly is used to absorb electromagnetic interference in the circuit.

5. The electromagnetic compatibility circuit of the transformer rectifier according to claim 1, characterized in that: The input end of the input line is connected to the aircraft power supply system, and the input end can access 115V / 200VAC.

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