CN217116052U

CN217116052U - Narrow-band pulse driving circuit for radar level meter

Info

Publication number: CN217116052U
Application number: CN202220955122.6U
Authority: CN
Inventors: 黄哲钊; 周宏明
Original assignee: Fuzhou Fuguang Baite Automation Equipment Co ltd
Current assignee: Fuzhou Fuguang Baite Automation Equipment Co ltd
Priority date: 2022-04-24
Filing date: 2022-04-24
Publication date: 2022-08-02
Anticipated expiration: 2032-04-24

Abstract

The utility model discloses a narrowband pulse drive circuit for radar level gauge, including resistance R1, resistance R2, resistance R11, triode Q1, triode Q2, triode Q10, electric capacity C1 and electric capacity C2, triode Q1 with triode Q2's base is established ties respectively resistance R1 with resistance R2 and with the signal end is connected, triode Q1 with triode Q2's emitter ground, triode Q1 with triode Q2's base is established ties respectively electric capacity C1 with electric capacity C2 ground connection sets up, triode Q1's collecting electrode with triode Q2's base is connected, supply voltage VCC is connected to triode Q10's emitter, triode Q10's base is established ties resistance R11 and with triode Q2's collecting electrode is connected, triode Q10's collecting electrode outputs narrow pulse signal. The circuit is beneficial to simplifying the system complexity of the traditional pulse radar level meter and has strong practicability.

Description

Narrow-band pulse driving circuit for radar level meter

Technical Field

The application relates to the technical field of pulse driving circuits, in particular to a narrow-band pulse driving circuit for a radar level meter.

Background

The pulsed radar level gauge calculates the distance by transmitting a narrow pulse packet of microwaves and receiving a reflected echo of the microwave pulse at the surface of the material, and by measuring the time of flight of the microwave pulse between transmission and reception.

In order to distinguish two adjacent echoes, a reliable narrow pulse generating circuit is needed to convert a square wave signal generated by an oscillating circuit into a spike-shaped narrow pulse signal with a period, and amplify the narrow pulse signal to drive a microwave oscillating circuit at the later stage. At present, the electronic switches that enable such fast speeds are certainly special, very expensive and also add to the cost of the product, and it is therefore necessary to provide a dedicated narrow pulse drive circuit for a pulsed radar level gauge.

SUMMERY OF THE UTILITY MODEL

The narrow-band pulse driving circuit for the radar level meter is provided by the application, aiming at the technical problems that in the prior art, a narrow-band pulse signal is amplified to drive a microwave oscillation circuit at the rear stage, the circuit is complex and special, and the cost of a product is increased.

The application provides a narrow band pulse driving circuit for a radar level gauge, which comprises a resistor R1, a resistor R2, a resistor R11, a triode Q1, a triode Q2, a triode Q10, a capacitor C1 and a capacitor C2, wherein the triode Q1 and the base of the triode Q2 are respectively connected in series, the resistor R1 and the resistor R2 are connected with the signal end, the triode Q1 and the emitter of the triode Q2 are grounded, the base of the triode Q1 and the base of the triode Q2 are respectively connected in series, the capacitor C1 and the capacitor C2 are grounded, the collector of the triode Q1 is connected with the base of the triode Q2, the emitter of the triode Q10 is connected with a power supply voltage VCC, the base of the triode Q10 is connected in series, the resistor R11 is connected with the collector of the triode Q2, and the collector of the triode Q10 outputs a narrow pulse signal. The circuit is beneficial to simplifying the system complexity of the traditional pulse radar level meter, reduces the cost and has strong practicability.

In some embodiments, the collector of the transistor Q1 is connected in series with the resistor R2 and the signal terminal.

In some specific embodiments, the power supply further includes a resistor R10, wherein one end of the resistor R10 is connected to the supply voltage VCC, and the other end is connected to the base of the transistor Q10.

In some specific embodiments, the collector of the transistor Q2 is connected in series with the resistor R11 and the end of the resistor R10 connected to the transistor Q10.

In some embodiments, the transistor Q1 and the transistor Q2 are BFR92P transistors. The triode of the type has low intermodulation distortion and high power gain, and also has excellent broadband performance and excellent characteristics of low noise and high frequency due to the very high conversion frequency.

In some specific embodiments, the resistor R1, the resistor R2, the resistor R10, the resistor R11, the capacitor C1 and the capacitor C2 are adjustable in parameters. By means of the narrow pulse width control device, the narrow pulse width can be controlled, the narrow pulse width control device can be adjusted automatically according to different measuring range resolution requirements, and the narrow pulse width control device has strong practicability.

In summary, the present application includes at least one of the following beneficial technical effects:

the utility model discloses a narrowband pulse drive circuit only uses high-speed triode and discrete resistance-capacitance element, and the circuit is simple reliable, and the peripheral resistance-capacitance element parameter of narrow pulse width accessible is adjusted by oneself according to different range resolution ratio demands, and back-end amplifier circuit can enlarge narrow pulse signal, does not need extra amplification module unit circuit, and this circuit is favorable to simplifying the system complexity of traditional pulse radar level meter, has very strong practicality.

Drawings

The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and together with the description serve to explain the principles of the application. Other embodiments and many of the intended advantages of embodiments will be readily appreciated as they become better understood by reference to the following detailed description. The elements of the drawings are not necessarily to scale relative to each other. Like reference numerals designate corresponding similar parts.

FIG. 1 is a schematic diagram of the overall architecture of a narrowband pulse driver circuit for a radar level gauge according to an embodiment of the present invention;

FIG. 2 is a diagram of a narrowband pulse drive circuit for a radar level gauge in a specific embodiment according to the present invention.

Detailed Description

To make the objects, technical solutions and advantages of the present application clearer, the present application will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.

Fig. 1 shows an overall architecture schematic diagram of a narrowband pulse driving circuit for a radar level gauge according to an embodiment of the present invention, through which a signal may output a narrowband pulse signal as shown in fig. 1. Referring to fig. 2, a diagram of a narrow band pulse driving circuit for a radar level gauge according to a specific embodiment is shown, the narrow band pulse driving circuit comprising a resistor R1, a resistor R2, a resistor R10, a resistor R11, a transistor Q1, a transistor Q2, a transistor Q10, a capacitor C1 and a capacitor C2, wherein an emitter of the transistor Q1 is grounded, a base series resistor R1 of the transistor Q1 is connected to a signal terminal, a base series capacitor C1 of the transistor Q1 is grounded to function as a transistor Q1 conducting later than the transistor Q2, and a collector of the transistor Q1 is connected to a resistor R2 in series and to the signal terminal; the base electrode of the triode Q2 is also grounded through a series capacitor C2 to play a role that the triode Q2 is conducted earlier than the triode Q1, the collector electrode of the triode Q1 is connected with the base electrode of the triode Q2, the emitter electrode of the triode Q2 is grounded, the base electrode of the triode Q2 is connected with a resistor R2 in series and is connected with a signal end, the collector electrode of the triode Q2 is connected with a resistor R11 in series and is connected with one end of a resistor R10, one end of the resistor R10 is connected with a power supply voltage VCC, and the other end of the resistor R10 is connected with the base electrode of the triode Q10; the emitter of the triode Q10 is connected with the supply voltage VCC, and the collector of the triode Q10 outputs a narrow pulse signal.

In some embodiments, transistor Q1 and transistor Q2 are BFR92P type transistors. It has low intermodulation distortion and high power gain, and it also has excellent broadband performance and excellent characteristics of low noise and high frequency due to its very high switching frequency.

In some specific embodiments, parameters of the resistor R1, the resistor R2, the resistor R10, the resistor R11, the transistor Q1, the capacitor C1, and the capacitor C2 are adjustable, so as to control the narrow pulse width, and particularly, the narrow pulse width can be adjusted according to different range resolution requirements, and therefore, the narrow pulse width adjusting circuit has strong practicability.

The utility model discloses a narrow pulse drive circuit for radar level meter has only adopted high-speed triode and discrete resistance-capacitance element, the circuit is simple reliable, the accessible is to the regulation that the periphery hinders the capacitance-capacitance element parameter come the narrow pulse width of regulation control, back-end amplifier circuit can enlarge narrow pulse signal, do not need extra amplification module unit circuit, this circuit is favorable to simplifying the system complexity of traditional pulse radar level meter, the cost of the system of traditional pulse radar level meter has been reduced, has very strong practicality.

While the present invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

In the description of the present application, it is to be understood that the terms "upper", "lower", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application. The word 'comprising' does not exclude the presence of elements or steps not listed in a claim. The word 'a' or 'an' preceding an element does not exclude the presence of a plurality of such elements. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. Any reference signs in the claims shall not be construed as limiting the scope.

Claims

1. A narrow-band pulse driving circuit for a radar level meter is characterized by comprising a resistor R1, a resistor R2, a resistor R11, a triode Q1, a triode Q2, a triode Q10, a capacitor C1 and a capacitor C2, wherein bases of the triode Q1 and the triode Q2 are respectively connected with the resistor R1 and the resistor R2 in series and are connected with a signal end, emitters of the triode Q1 and the triode Q2 are grounded, bases of the triode Q1 and the triode Q2 are respectively connected with the capacitor C1 and the capacitor C2 in series and are grounded, a collector of the triode Q1 is connected with a base of the triode Q2, an emitter of the triode Q10 is connected with a power supply voltage VCC, a base of the triode Q10 is connected with the resistor R11 in series and is connected with a collector of the triode Q2, and a collector of the triode Q10 outputs a narrow pulse signal.

2. The narrow band pulse drive circuit for a radar level gauge according to claim 1, wherein the collector of said transistor Q1 is connected in series with said resistor R2 and said signal terminal.

3. The narrow band pulse driving circuit for a radar level gauge according to claim 1, further comprising a resistor R10, wherein one end of said resistor R10 is connected to said supply voltage VCC, and the other end is connected to the base of said transistor Q10.

4. The narrow band pulse driving circuit for a radar level gauge according to claim 3, wherein the collector of said transistor Q2 is connected in series with said resistor R11 at the end where said resistor R10 is connected with said transistor Q10.

5. The narrow band pulse driving circuit for a radar level gauge according to claim 1, wherein said transistor Q1 and said transistor Q2 are transistors of the BFR92P type.

6. The narrow band pulse driving circuit for a radar level gauge according to claim 3, wherein said resistor R1, resistor R2, resistor R10, resistor R11, capacitor C1 and capacitor C2 are parametrically adjustable.