Electromagnetic compatibility improved structure of transformer rectifier

Abstract

The invention discloses a transformer rectifier electromagnetic compatibility improved structure 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 machine shell capacitor. According to the invention, 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 invention relates to the field of transformer rectifiers, and in particular to an improved electromagnetic compatibility structure of a transformer rectifier. Background Art

[0002] With the development of more-electric / all-electric aircraft, the demand for power supply has increased significantly, and the output power of transformer-rectifiers has also increased significantly, but the electromagnetic interference brought about by this has also increased significantly; due to the working characteristics of the transformer-rectifier itself, the internal rectifier devices will cause electromagnetic interference when they are turned on and off.

[0003] At present, due to space and weight limitations, transformer rectifiers at home and abroad can only absorb interference through capacitors; however, this interference cannot be solved by simply absorbing it through capacitors, and if you want to solve it completely, you need to install a special filter. This filter is not only bulky but also expensive, and the cost is high, and the transformer rectifier itself cannot bear it; for this reason, an improved structure of electromagnetic compatibility of transformer rectifier is proposed. Summary of the invention

[0004] The object of the present invention is to provide an improved structure of electromagnetic compatibility of a transformer rectifier to solve the problem in the above background technology that the existing filter is not only bulky but also expensive and costly when reducing the electromagnetic compatibility of the transformer rectifier.

[0005] To achieve the above object, the present invention provides the following technical solutions: A transformer rectifier electromagnetic compatibility improved structure comprises an input line, a transformer and a rectifier bridge, wherein a common mode inductor and a filter capacitor assembly are sequentially connected between the input line and the transformer, and a casing capacitor is connected to the output end of the rectifier bridge.

[0006] Furthermore, the inductance of the common-mode inductor is 100mH-400mH, and the common-mode inductor is used to suppress electromagnetic interference.

[0007] Furthermore, the capacity of the casing capacitor is 2.2 μF-4.5 μF, and the casing capacitor includes capacitor C8 and capacitor C9 connected to the output end of the rectifier bridge.

[0008] Furthermore, the filter capacitor assembly includes capacitor C4, capacitor C5 and capacitor C6, and the filter capacitor assembly is used to absorb electromagnetic interference in the circuit.

[0009] Furthermore, the input end of the input line is connected to the aircraft power supply system, and the input end can be connected to 115V / 200VAC.

[0010] The beneficial effects of the present invention are: The present invention can suppress electromagnetic interference in the circuit and further reduce the capacity of the input line filter capacitor originally used to prevent interference by increasing the common-mode inductance and the casing capacitance, thereby greatly reducing the volume required for the transformer rectifier, having low cost, and further increasing the economy of the transformer rectifier, effectively solving the problem of high cost and high price in electromagnetic compatibility of the transformer rectifier, and facilitating the popularization and use of the electromagnetic compatibility circuit of the transformer rectifier. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the electromagnetic compatibility circuit of the transformer rectifier of the present invention.

[0012] In the figure: 1 input line, 2 common mode inductor, 3 transformer, 4 rectifier bridge. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0014] See also Figure 1 , which provides a technical solution for the present invention, an improved electromagnetic compatibility structure of a transformer rectifier, including an input line 1, a transformer 3 and a rectifier bridge 4, a common-mode inductor 2 and a filter capacitor assembly are connected between the input line 1 and the transformer 3 in sequence, the input end of the input line 1 is connected to the aircraft power supply system, and the input end can be connected to 115V / 200VAC; the filter capacitor assembly mentioned includes capacitor C4, capacitor C5 and capacitor C6, and the filter capacitor assembly is used to absorb electromagnetic interference in the circuit; wherein, the output end of the rectifier bridge 4 is connected to a casing capacitor, the casing capacitor capacity is 2.2μF-4.5μF, and the casing capacitor includes capacitor C8 and capacitor C9 connected to the output end of the rectifier bridge 4; wherein, the common-mode inductor 2 mentioned has an inductance of 100mH-400mH, and the common-mode inductor 2 is used to suppress electromagnetic interference.

[0015] The electromagnetic compatibility circuit of the transformer rectifier can suppress interference by only adding common-mode inductance and casing capacitance, namely, capacitor C8 and capacitor C9, to the circuit, and can further reduce the capacity of input line capacitance C4, capacitor C5 and capacitor C6 originally used to suppress interference; according to the output power of the transformer rectifier, the inductance of the common-mode inductance can be selected in the range of 140mH to 390mH, and the casing capacitance is recommended to be in the range of 2.7μF to 4.0μF. The above parameters can be changed according to the actual use effect. The circuit is suitable for all transformer rectifier type products.

[0016] In this embodiment, the input line 1 of the aircraft power supply system is connected to the three-phase electricity of phase A, phase B, and phase C. The input line 1 transmits the three-phase electricity to the common-mode inductor 2. The current passing through the common-mode inductor 2 enters the transformer 3 after passing through the filter capacitor component for transformation, and is transmitted to the rectifier bridge 4 for rectification and then transmitted to the casing capacitor. The output voltage after rectification is 28.5V; the electromagnetic interference caused by the internal rectifier device being turned on and off at the moment is suppressed by the common-mode inductor 2 and the casing capacitor, which can further reduce the capacity of the input line capacitor C4, capacitor 5 and capacitor C6 that were originally used for interference.

[0017] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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, they should be considered to be within the scope of this specification.

[0018] The above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be understood that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. In the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection, or integrated; it can be a mechanical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium; among them, there are many ways of detachable installation, for example, it can be through a method of plugging and snap-fitting, and for example, through a method of bolt connection, etc.

Claims

1. An improved structure for electromagnetic compatibility of a transformer rectifier, characterized in that: It comprises an input line, a transformer and a rectifier bridge. A common mode inductor and a filter capacitor component are connected in sequence between the input line and the transformer. The output end of the rectifier bridge is connected to a casing capacitor.

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

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

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

5. The transformer rectifier electromagnetic compatibility circuit 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 be connected to 115V / 200VAC.

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