阅读说明：本技术 一种谐振式结冰探测器驱动电路 (Resonant mode detector drive circuit that freezes ) 是由 康志宏 宋继红 姚敏强 李拉兔 于 2020-12-24 设计创作，主要内容包括：本发明属于飞行器结冰探测设计领域,具体涉及一种谐振式结冰探测器驱动电路；本发明提供一种5V电压供电,由电压比较器、电阻、电容、电磁线圈组成,通过调节电阻、电容和电感对驱动电路的相位进行微调使振管在本征频率位置处振荡,通过上电过程控制振荡驱动电路起振的驱动电路。(The invention belongs to the field of aircraft icing detection design, and particularly relates to a resonant icing detector driving circuit; the invention provides a 5V voltage power supply, which comprises a voltage comparator, a resistor, a capacitor and an electromagnetic coil, wherein the phase of a driving circuit is finely adjusted by adjusting the resistor, the capacitor and an inductor, so that a vibrating tube oscillates at an eigen frequency position, and the oscillation starting of the oscillation driving circuit is controlled by a power-on process.)

1. A resonant mode icing detector drive circuit is characterized in that: the circuit consists of resistors R1, R2, R3, R4, R5, R6 and R7, capacitors C1, C2 and C3, an excitation coil L1, a vibration pickup coil L2, a first comparator N1 and a second comparator N2;

the positive terminal of the comparator N1 is connected with the power supply after being connected with the R1; the negative end of the comparator N1 is connected with the resistor R2 and then grounded; two ends of the vibration pickup coil L2 are connected with two ends of the capacitor C1; the negative end of the vibration pickup coil L2 is connected with the positive end of the comparator N1, and the positive end of the vibration pickup coil L2 is connected with the negative end of the comparator N1; the output end of the comparator N1 is connected with the pull-up resistor R3 and then is connected with a power supply; two ends of the exciting coil L1 are connected with two ends of the capacitor C2; the negative end of the excitation coil L1 is grounded; one end of the C3 is connected with the output end of the comparator N1, and the other end is connected with the positive end of the exciting coil L1; one end of the R7 is connected with a 5V power supply, and the other end is connected with the positive end of the exciting coil L1; the positive terminal of the comparator N2 is connected with the output of the comparator N1; the negative terminal of the comparator N2 is connected to the power supply through R4 and to ground through R5; the output of the comparator N2 is connected to the power supply through a pull-up resistor R6.

2. The drive circuit according to claim 1, wherein: the excitation coil L1 drives the vibrating tube to carry out magnetostriction, and the vibration pickup coil L2 picks up a magnetostrictive signal of the vibrating tube; the inductance of the exciting coil L1 and the vibration pick-up coil L2 is 2 mH-5 mH, and the resistance of the coils L1 and L2 is 5 omega-20 omega.

3. The drive circuit according to claim 1, wherein:

R1＝R2＝1kΩ～5kΩ；

r3 ═ mR4, m is a natural number;

r5 ═ R6 ═ 1k Ω to 3k Ω are pull-up resistors.

4. The drive circuit according to claim 3, wherein:

R1＝R2＝R3＝R4＝R5＝R6＝1kΩ。

5. the drive circuit according to claim 1, wherein: the resistance value of the R7 is 100 omega-1 k omega, and the R7 is a starting oscillation resistor.

6. The drive circuit according to claim 5, wherein: the R7 resistance is 1k Ω.

7. The drive circuit according to claim 1, wherein: c1, C2 and C3 are 1 nF-50 nF.

8. The drive circuit according to claim 7, wherein: c1 ═ C2 ═ C3 ═ 10 nF.

9. The drive circuit according to claim 1, wherein: the comparator is a double precision comparator F193, which includes a first comparator N1 and a second comparator N2.

10. The drive circuit according to claim 1, wherein: the power supply is 5V.

Technical Field

The invention belongs to the field of aircraft icing detection design, and particularly relates to a resonant icing detector driving circuit.

Background

At present, a resonant icing detector forms a self-excited oscillation circuit through a driving circuit and a vibrating tube to enable the vibrating tube to work at an eigenfrequency. A drive circuit is composed of a voltage comparator, a resistor, a capacitor and the like, and works by supplying power of +/-15V. Another driving circuit is a 5V power supply, as in cn201711177611.3, which is composed of an operational amplifier, a capacitor, a resistor, etc. There are the following problems: the first +/-15V power supply driving circuit has high power consumption, large volume and high cost; the second 5V power supply driving circuit has many devices and a complex structure.

Disclosure of Invention

The purpose of the invention is: the resonant icing detector driving circuit is provided, so that the number of devices is small, the structure is simple, the cost is low, and the resonant icing detector driving circuit can be combined with a self-made coil to drive a resonant vibrating tube.

In order to solve the technical problem, the technical scheme of the invention is as follows:

a resonant icing detector driving circuit is composed of resistors R1, R2, R3, R4, R5, R6 and R7, capacitors C1, C2 and C3, coils L1 and L2, a first comparator N1 and a second comparator N2;

the positive terminal of the comparator N1 is connected with the power supply after being connected with the R1; the negative end of the comparator N1 is connected with the resistor R2 and then grounded; two ends of the vibration pickup coil L2 are connected with two ends of the capacitor C1; the negative end of the vibration pickup coil L2 is connected with the positive end of the comparator N1, and the positive end of the vibration pickup coil L2 is connected with the negative end of the comparator N1; the output end of the comparator N1 is connected with the pull-up resistor R3 and then is connected with a power supply; two ends of the exciting coil L1 are connected with two ends of the capacitor C2; the negative end of the excitation coil L1 is grounded; one end of the C3 is connected with the output end of the comparator N1, and the other end is connected with the positive end of the exciting coil L1; one end of the R7 is connected with a 5V power supply, and the other end is connected with the positive end of the exciting coil L1; the positive terminal of the comparator N2 is connected with the output of the comparator N1; the negative terminal of the comparator N2 is connected to the power supply through R4 and to ground through R5; the output of the comparator N2 is connected to the power supply through a pull-up resistor R6.

The power supply is 5V.

The excitation coil L1 drives the vibrating tube to carry out magnetostriction, and the vibration pickup coil L2 picks up a magnetostrictive signal of the vibrating tube; the inductance of the exciting coil L1 and the vibration pick-up coil L2 is 2 mH-5 mH, and the resistance of the coils L1 and L2 is 5 omega-20 omega.

The resistors R1, R2, R3, R4, R5, R6 and R7 have the following functions and sizes:

r1 ═ R2 ═ 1k Ω to 5k Ω, and is used to adjust the bias voltage;

r3 ═ mR4, m is a natural number; for adjusting the frequency output duty cycle;

r5, R6, 1k Ω to 3k Ω are pull-up resistors for adjusting the driving capability of the comparators N1 and N2;

preferably, R1 ═ R2 ═ R3 ═ R4 ═ R5 ═ R6 ═ 1k Ω.

R7 resistance value is 100 omega-1 k omega, which is the starting oscillation resistance; r7 is preferably 1 k.OMEGA..

The functions and the sizes of the capacitors C1, C2 and C3 are as follows:

the capacitor C1 and the vibration pickup coil L2 form a vibration pickup signal extraction circuit and serve as the input of a comparator N1;

the capacitor C2 and the exciting coil L1 form an exciting circuit to drive the vibrating tube to magnetostriction;

the capacitor C3 is used for isolating direct current on one hand and carrying out phase adjustment and filtering on the other hand;

c1, C2 and C3 are 1 nF-50 nF;

c1 ═ C2 ═ C3 ═ 10nF is preferred.

The comparator is a double precision comparator F193. The comparator N1 is the main component of the oscillation driving circuit, and the comparator N2 is responsible for shaping and outputting the frequency signal.

The invention has the beneficial effects that:

the invention is composed of a voltage comparator, a resistor, a capacitor and the like, is powered by 5V voltage, finely adjusts the phase position of a driving circuit by adjusting the resistor, the capacitor and an inductor to enable a vibrating tube to vibrate at the position of an eigenfrequency, and controls the vibration of the vibration driving circuit through the electrifying process. The circuit has the advantages of simple structure, low cost, small area and low power consumption.

Compared with the first +/-15V power supply driving circuit, the driving circuit has small scale, low power consumption and low cost;

compared with a second 5V power supply driving circuit, the invention selects two same comparators, has fewer adopted devices, simple structure and lower cost, and can drive the resonance vibrating tube by combining a self-made coil.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings used in the embodiment of the present invention will be briefly explained. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be obtained from these drawings without inventive effort.

Fig. 1 is a circuit diagram of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Features of various aspects of embodiments of the invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without these specific details. The following description of the embodiments is merely intended to better understand the present invention by illustrating examples thereof. The present invention is not limited to any particular arrangement or method provided below, but rather covers all product structures, any modifications, alterations, etc. of the method covered without departing from the spirit of the invention.

In the drawings and the following description, well-known structures and techniques are not shown to avoid unnecessarily obscuring the present invention.

The circuit schematic diagram of the invention is shown in fig. 1, and the resonant icing detector driving circuit of the invention is composed of resistors R1, R2, R3, R4, R5, R6 and R7, capacitors C1, C2 and C3, an exciting coil L1, a vibration pickup coil L2, a first comparator and a second comparator;

specification of enameled wire of excitation coil L1 and vibration pickup coil L2The size of the inductance can be designed according to the requirements of the vibrating tube; in this embodiment, the inductances of the excitation coil L1 and the vibration pickup coil L2 are all 3.3mH, the resistances of the coils L1 and L2 are all 17 Ω, C1-C2-C3-10 nF, R1-R2-R3-R4-R5-R6R7 ═ 1k Ω, and power supply 5V.

The invention finely adjusts the phase of the driving circuit by adjusting the resistor, the capacitor and the inductor to enable the vibrating tube P to oscillate at the position of the eigen frequency, controls the driving circuit of the oscillation driving circuit to start oscillation by the electrifying process, and has the following specific working process:

the driving circuit adopts a 5V power supply to supply power; the comparator F193 as a main component of the circuit; the vibrating tube is driven to work through a comparator N1 and a peripheral resistor, a capacitor and an inductor, an excitation circuit of the vibrating tube is formed by L1 and C2, and a vibration pickup circuit of a vibrating tube signal is formed by L2 and C1; the phase of the driving circuit is finely adjusted by finely adjusting C1, C2, C3, L1 and L2 to enable the whole circuit to reach phase balance; the peripheral circuit of the comparator N2 forms a frequency signal output stage; the power supply energy is obtained through the resistor R7, and the whole circuit is oscillated to start oscillation.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.