Power supply filter circuit applied to icing detection system

Abstract

The invention belongs to the field of icing detection systems, and relates to a power supply filter circuit applied to an icing detection system. The invention designs a stable 115V-to-5V power supply filter circuit according to the design requirement of a certain civil aircraft. The method comprises the aspects of circuit module design, device model selection and the like. According to the invention, the current situation of blank in the field of AC power supply of icing detectors on civil aircrafts in China can be solved, and the circuit has the characteristics of strong practicability, simple structure, wide application range, strong anti-interference capability and the like.

Description

Technical Field

[0001] The invention relates to the field of ice detection systems, and in particular to a power supply filter circuit applied to ice detection systems. Background Art

[0002] Ice detection systems are essential equipment for large and medium-sized civil aircraft. With the rapid development of civil aircraft, there is a huge demand for ice detection systems. At present, the development of ice detection systems in China is in its early stages. Traditionally, domestic ice detectors have mostly used 28V DC power supply, and there are still weaknesses in the 115V current power supply. The present invention is designed for the 115V power supply circuit and provides a stable 115V to 5V power supply filter circuit. Summary of the invention

[0003] The purpose of the present invention is to provide a reliable and stable 115V to 5V power supply filter circuit to ensure the normal operation of an ice detection system.

[0004] The technical solution of the present invention is:

[0005] Provided is a power supply filter circuit for an ice detection system, comprising an AC / DC module, a filter capacitor C2, a filter capacitor C4, a tantalum capacitor C3, a feedthrough capacitor C5, a transient suppression diode V2, a feedthrough capacitor C1 and a transient suppression diode V1;

[0006] The input power supply is connected to the input end of the AC / DC module, and the filter capacitor C2, the filter capacitor C4 and the tantalum capacitor C3 are connected in parallel between the ±5V output ends of the AC / DC module. The -5V output end, the KTD filter and the GND are connected to the three ends of the through-hole capacitor C5, and the +5V output end and the KTD filter are connected to the first and second ends of the through-hole capacitor C1. The third end of the through-hole capacitor C1 serves as the output of the power filter circuit. A transient suppression diode V2 is connected between GND and the KTD filter. A transient suppression diode V1 is connected between the third end of the through-hole capacitor C1 and the KTD filter. The output of the power filter circuit is a stable +5V power supply.

[0007] Furthermore, the voltage of the input power supply is 115V / 400Hz.

[0008] Furthermore, the feedthrough capacitor is not less than 0.76uF.

[0009] The working process of the filter circuit is as follows: the 115V AC power supply is converted into an unfiltered 5V power supply through the AC / DC module, and then filtered by the shielding shell and the through-hole capacitors C1 and C5, and then filtered by the C2 and C4 filter capacitors. The C3 tantalum capacitor plays a role in power supply protection, and the V1 and V2 transient suppression diodes can prevent large voltages and play a role in lightning protection.

[0010] The advantages of the present invention are as follows: the present invention converts an onboard 115V AC power supply into an unfiltered 5V DC power supply through an AC / DC module, and after being shielded and filtered by a shielding shell and through-hole capacitors C1 and C5, the requirements of items such as sensitivity of induced signals, radio frequency sensitivity, and radio frequency energy emission of airborne equipment can be met, and then interference filtering is performed by filter capacitors C2 and C4, and the C3 tantalum capacitor plays a role in power supply protection, meeting the requirements of power input and voltage spike items of airborne equipment, and large voltage can be prevented by transient suppression diodes V1 and V2, playing a role in lightning protection, meeting the requirements of lightning induced transient sensitivity items of airborne equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a circuit diagram of the present invention. DETAILED DESCRIPTION

[0012] The disclosed examples will be more fully described with reference to the accompanying drawings, in which some (but not all) of the disclosed examples are shown. In fact, many different examples may be described and these examples should not be construed as limited to the examples set forth herein. Instead, these examples are described so that this disclosure will be thorough and complete and will fully convey the scope of the disclosure to those skilled in the art.

[0013] Provided is a power supply filter circuit for an ice detection system, comprising an AC / DC module, a filter capacitor C2, a filter capacitor C4, a tantalum capacitor C3, a feedthrough capacitor C5, a transient suppression diode V2, a feedthrough capacitor C1 and a transient suppression diode V1;

[0014] The input power supply is connected to the input end of the AC / DC module, and the filter capacitor C2, the filter capacitor C4 and the tantalum capacitor C3 are connected in parallel between the ±5V output ends of the AC / DC module. The -5V output end, the KTD filter and the GND are connected to the three ends of the through-hole capacitor C5, and the +5V output end and the KTD filter are connected to the first and second ends of the through-hole capacitor C1. The third end of the through-hole capacitor C1 serves as the output of the power filter circuit. A transient suppression diode V2 is connected between GND and the KTD filter. A transient suppression diode V1 is connected between the third end of the through-hole capacitor C1 and the KTD filter. The output of the power filter circuit is a stable +5V power supply.

[0015] The input power voltage is 115V / 400Hz.

[0016] The feedthrough capacitor should not be less than 0.76uF.

[0017] The description of different advantageous arrangements has been presented for purposes of illustration and description, but the description is not intended to be exclusive or limited to examples of the disclosed form. Many modifications and variations will be apparent to those of ordinary skill in the art. Additionally, different advantageous examples may describe different advantages over other advantageous examples. The selected example or examples are chosen and described in order to best illustrate the principles of the examples, the practical application, and to enable those of ordinary skill in the art to understand the disclosure with various examples with various modifications suitable for the particular use contemplated.

Claims

1. A power supply filter circuit used in an ice detection system, characterized in that: Including AC / DC module, filter capacitor C2, filter capacitor C4, tantalum capacitor C3, through-hole capacitor C5, transient suppression diode V2, through-hole capacitor C1 and transient suppression diode V1; The input power supply is connected to the input end of the AC / DC module, and the filter capacitor C2, the filter capacitor C4 and the tantalum capacitor C3 are connected in parallel between the ±5V output ends of the AC / DC module. The -5V output end, the KTD filter and the GND are connected to the three ends of the through-hole capacitor C5, and the +5V output end and the KTD filter are connected to the first and second ends of the through-hole capacitor C1. The third end of the through-hole capacitor C1 serves as the output of the power filter circuit. A transient suppression diode V2 is connected between GND and the KTD filter. A transient suppression diode V1 is connected between the third end of the through-hole capacitor C1 and the KTD filter. The output of the power filter circuit is a stable +5V power supply.

2. The power supply filter circuit used in an ice detection system according to claim 1, characterized in that: The input power voltage is 115V / 400Hz.

3. The power supply filter circuit used in an ice detection system according to claim 1, characterized in that: The feedthrough capacitor should not be less than 0.76uF.

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