阅读说明：本技术 一种用于硬币检测的多频信号发生及处理电路 (Multi-frequency signal generation and processing circuit for coin detection ) 是由 贺春华 唐坚 彭* 彭 于 2020-06-23 设计创作，主要内容包括：本发明公开了一种用于硬币检测的多频信号发生及处理电路,包括方波发生电路、三组滤波电路、混频电路和检测传感器,三组滤波电路分别为第一、第二、第三滤波电路,方波发生电路的输出端与滤波电路的输入端连接,滤波电路的输出端与混频电路的输入端连接,混频电路的输出端与检测传感器连接,方波发生电路可产生三组频率不同的方波信号,三组方波信号经滤波电路处理后得到对应频率的三组正弦波信号,三组正弦波信号经过混频电路叠加后得到用于硬币检测的混频信号；本发明成本较低,电路集成度更高,同时优化了结构上因检测传感器数量过多造成的结构设计问题,在结构上更简单化,有利于最终产品生产效率的提高以及成本的控制。(The invention discloses a multi-frequency signal generating and processing circuit for coin detection, which comprises a square wave generating circuit, three groups of filter circuits, a mixing circuit and a detection sensor, wherein the three groups of filter circuits are respectively a first filter circuit, a second filter circuit and a third filter circuit; the invention has lower cost and higher circuit integration level, simultaneously optimizes the structural design problem caused by excessive detection sensors on the structure, simplifies the structure, and is beneficial to the improvement of the production efficiency of final products and the control of the cost.)

1. The utility model provides a multifrequency signal takes place and processing circuit for coin detects, its characterized in that, includes square wave generating circuit, three filter circuit of group, mixing circuit and detection sensor, and three filter circuit of group are first, second, third filter circuit respectively, square wave generating circuit's output is connected with filter circuit's input, filter circuit's output and mixing circuit's input are connected, mixing circuit's output and detection sensor are connected, square wave generating circuit can produce the different square wave signal of three group's frequencies, and three groups square wave signal obtains the three sine wave signal of three groups of corresponding frequency after filter circuit handles, and three groups sine wave signal obtains the mixing signal that is used for coin detection after mixing circuit superposes.

2. The multi-frequency signal generating and processing circuit for coin detection as claimed in claim 1, wherein said square wave generating circuit comprises an asynchronous counter IC1, a passive crystal oscillator Y1, a capacitor C19, a capacitor C20 and a resistor R19, and the fifteenth, fourth and seventh frequency output pins of said asynchronous counter IC1 output signals to the first, second and third filter circuits, respectively.

3. The multi-frequency signal generating and processing circuit for coin detection as claimed in claim 2, wherein said first filter circuit comprises a capacitor C1, a resistor R1, a capacitor C2, a resistor R2, a capacitor C3, a resistor R3, an operational amplifier IC2-a, a resistor R4, a capacitor C4, a resistor R5, a capacitor C5, a resistor R6, an operational amplifier IC2-B and a capacitor C6, and a signal output terminal of said first filter circuit is connected to a first input terminal of said mixer circuit.

4. The multi-frequency signal generating and processing circuit for coin detection as claimed in claim 2, wherein said second filter circuit comprises a capacitor C11, a resistor R7, a capacitor C7, a resistor R12, a capacitor C8, a resistor R8, an operational amplifier IC3-a, a resistor R9, a capacitor C10, a resistor R10, a capacitor C9, a resistor R11, an operational amplifier IC3-B and a capacitor C12, and a signal output terminal of said second filter circuit is connected to a second input terminal of said mixer circuit.

5. The multi-frequency signal generating and processing circuit for coin detection as claimed in claim 2, wherein said third filter circuit comprises a capacitor C17, a resistor R13, a capacitor C13, a resistor R18, a capacitor C14, a resistor R14, an operational amplifier IC4-a, a resistor R15, a capacitor C16, a resistor R16, a capacitor C15, a resistor R17, an operational amplifier IC4-B and a capacitor C18, and a signal output terminal of said third filter circuit is connected to a third input terminal of said mixer circuit.

6. The multi-frequency signal generating and processing circuit for coin sensing of claim 1, wherein said mixer circuit comprises a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R26 and an operational amplifier IC5-a, and a signal output terminal of said mixer circuit is connected to said sensor.

Technical Field

The invention relates to the technical field of coin detection, in particular to a multi-frequency signal generating and processing circuit for coin detection.

Background

In the coin detection industry, coins of different sizes and materials are required to be detected, but coins of different materials often have different sensitivities to alternating signals of different frequencies, so that signals of multiple frequencies are required to be generated to meet the use requirements. However, in the prior art, programmable chips such as an FPGA are used to generate multi-frequency square wave signals, or a multi-channel timer is used to generate different-frequency square wave signals, and a plurality of sensors are required to acquire and process signals corresponding to different frequency bands, so that the circuit and the structure are complex in design, the cost is high, and the production efficiency is low in actual production.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a multi-frequency signal generating and processing circuit for coin detection, which has the advantages of low cost and higher circuit integration level, optimizes the structural design problem caused by excessive detection sensors in the structure, simplifies the structure, and is beneficial to the improvement of the production efficiency of final products and the control of the cost.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a multifrequency signal takes place and processing circuit for coin detects, includes square wave generating circuit, three sets of filter circuit, mixing circuit and detection sensor, and three sets of filter circuit are first, second, third filter circuit respectively, square wave generating circuit's output is connected with filter circuit's input, filter circuit's output and mixing circuit's input are connected, mixing circuit's output and detection sensor are connected, square wave generating circuit can produce the different square wave signal of three sets of frequencies, and three sets of square wave signal obtains the three sets of sinusoidal wave signal of corresponding frequency after filter circuit handles, and is three sets sinusoidal wave signal obtains the mixing signal that is used for coin to detect after mixing circuit superposes.

Preferably, the square wave generating circuit comprises an asynchronous counter IC1, a passive crystal oscillator Y1, a capacitor C19, a capacitor C20 and a resistor R19, and fifteenth, fourth and seventh frequency output pins of the asynchronous counter IC1 output signals to the first, second and third filter circuits, respectively.

Preferably, the first filter circuit comprises a capacitor C1, a resistor R1, a capacitor C2, a resistor R2, a capacitor C3, a resistor R3, an operational amplifier IC2-A, a resistor R4, a capacitor C4, a resistor R5, a capacitor C5, a resistor R6, an operational amplifier IC2-B and a capacitor C6, and a signal output end of the first filter circuit is connected with a first input end of the mixer circuit.

Preferably, the second filter circuit comprises a capacitor C11, a resistor R7, a capacitor C7, a resistor R12, a capacitor C8, a resistor R8, an operational amplifier IC3-a, a resistor R9, a capacitor C10, a resistor R10, a capacitor C9, a resistor R11, an operational amplifier IC3-B and a capacitor C12, and a signal output end of the second filter circuit is connected with the second input end of the mixer circuit.

Preferably, the third filter circuit comprises a capacitor C17, a resistor R13, a capacitor C13, a resistor R18, a capacitor C14, a resistor R14, an operational amplifier IC4-a, a resistor R15, a capacitor C16, a resistor R16, a capacitor C15, a resistor R17, an operational amplifier IC4-B and a capacitor C18, and a signal output end of the third filter circuit is connected with a third input end of the mixer circuit.

Preferably, the mixer circuit comprises a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R26 and an operational amplifier IC5-A, and a signal output end of the mixer circuit is connected with the detection sensor.

Compared with the prior art, the invention has the following beneficial effects: the invention relates to a multi-frequency signal generating and processing circuit for coin detection, which generates three groups of square wave signals with different frequencies through an asynchronous counter, obtains three groups of sine wave signals with independent corresponding frequencies after being processed by a filter circuit, and changes the square wave signals into a mixed signal after passing through a mixer circuit, and finally outputs the mixed signal to a detection sensor for detection. Is beneficial to improving the production efficiency of the final product and controlling the cost.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is an electronic block diagram of the present invention;

FIG. 2 is a schematic diagram of an analog circuit of the square wave generator circuit of the present invention;

FIG. 3 is a circuit diagram of a first filter circuit according to the present invention;

FIG. 4 is a circuit diagram of a second filter circuit according to the present invention;

FIG. 5 is a circuit diagram of a third filter circuit according to the present invention;

FIG. 6 is a circuit diagram of a mixer circuit according to the present invention.

Detailed Description

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and the detailed description, but those skilled in the art will understand that the following described embodiments are some, not all, of the embodiments of the present invention, and are only used for illustrating the present invention, and should not be construed as limiting the scope of the present invention. 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.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 to 6, in an embodiment of the present invention, a multi-frequency signal generating and processing circuit for coin detection includes a square wave generating circuit, three sets of filter circuits, a mixer circuit, and a detection sensor, where the three sets of filter circuits are respectively a first filter circuit, a second filter circuit, and a third filter circuit, an output end of the square wave generating circuit is connected to an input end of the filter circuit, an output end of the filter circuit is connected to an input end of the mixer circuit, an output end of the mixer circuit is connected to the detection sensor, the square wave generating circuit can generate three sets of square wave signals with different frequencies, the three sets of square wave signals are processed by the filter circuit to obtain three sets of sine wave signals with corresponding frequencies, and the three sets of sine wave signals are superposed by the mixer circuit to obtain a mixed signal for.

In this embodiment, the square wave generating circuit includes an asynchronous counter IC1, a passive crystal oscillator Y1, a capacitor C19, a capacitor C20, and a resistor R19, and the fifteenth, fourth, and seventh frequency output pins of the asynchronous counter IC1 output signals to the first, second, and third filter circuits, respectively.

In this embodiment, the first filter circuit includes a capacitor C1, a resistor R1, a capacitor C2, a resistor R2, a capacitor C3, a resistor R3, an operational amplifier IC2-a, a resistor R4, a capacitor C4, a resistor R5, a capacitor C5, a resistor R6, an operational amplifier IC2-B, and a capacitor C6, and a signal output terminal of the first filter circuit is connected to a first input terminal of the mixer circuit.

In this embodiment, the second filter circuit includes a capacitor C11, a resistor R7, a capacitor C7, a resistor R12, a capacitor C8, a resistor R8, an operational amplifier IC3-a, a resistor R9, a capacitor C10, a resistor R10, a capacitor C9, a resistor R11, an operational amplifier IC3-B, and a capacitor C12, and a signal output terminal of the second filter circuit is connected to the second input terminal of the mixer circuit.

In this embodiment, the third filter circuit includes a capacitor C17, a resistor R13, a capacitor C13, a resistor R18, a capacitor C14, a resistor R14, an operational amplifier IC4-a, a resistor R15, a capacitor C16, a resistor R16, a capacitor C15, a resistor R17, an operational amplifier IC4-B, and a capacitor C18, and a signal output terminal of the third filter circuit is connected to a third input terminal of the mixer circuit.

In this embodiment, the mixer circuit includes a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R26, and an operational amplifier IC5-a, and a signal output terminal of the mixer circuit is connected to the detection sensor.

The present invention has been described only in terms of the generation of coin detection signals and is not concerned with the reception and processing of coin detection sensor signals. The signal can be received and processed through the first filter circuit, the second filter circuit and the third filter circuit, which are mentioned in the invention, as the frequency division processing for receiving the signal of the detection sensor, and finally, the ADC signal for the identification of the singlechip can be obtained through the amplification and rectification circuit.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.