Adjusting circuit capable of rapidly matching frequency

Abstract

The utility model discloses an adjusting circuit capable of rapidly matching frequency, which comprises a self-excited oscillation circuit, a full-bridge driving circuit and a transmitting antenna, and is characterized in that the self-excited oscillation circuit is electrically connected with the transmitting antenna through the full-bridge driving circuit; the self-excited oscillation circuit comprises an operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a first capacitor, in the adjusting circuit capable of rapidly matching the frequency, frequency output of the self-excited oscillation circuit can be achieved by adjusting the resistance value of the first resistor, the function of rapidly matching the frequency is achieved, and meanwhile, the adjusting circuit is convenient to operate. The self-excited oscillation circuit and the full-bridge driving circuit both adopt conventional power components, so that the cost of the adjusting circuit can be greatly reduced, the maintenance cost is also reduced, and the practicability of the circuit is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronics, in particular to a regulating circuit for fast frequency matching. Background Art

[0002] like Figure 1 As shown in the figure, when driving the antenna at the theoretically calculated drive frequency, various noises will appear in the coil waveform, including steps, ringing, and glitches during transitions. This noise can be caused by the Miller effect caused by parasitic capacitance of the MOS tube, mismatched antenna impedance, and oscillation caused by equivalent inductance of the circuit. Therefore, circuits with automatic matching adjustment functions are now available to address these situations.

[0003] According to patent number CN115642789A, patent name: An automatic matching adjustment circuit for fast frequency matching, professional and technical personnel know that it uses the method of adjusting the frequency of the self-excited oscillation circuit to achieve matching. However, during use, bumps or other reasons often occur, causing internal circuit failures. Since this technology uses highly integrated integrated circuits, chip replacement is required for maintenance, which increases the cost of maintenance, and the equipment cost will also increase accordingly. Utility Model Content

[0004] In order to overcome the above-mentioned deficiencies, the present invention provides a regulating circuit for fast frequency matching.

[0005] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0006] A fast frequency matching adjustment circuit includes a self-excited oscillation circuit, a full-bridge drive circuit and a transmitting antenna, wherein the self-excited oscillation circuit is electrically connected to the transmitting antenna through the full-bridge drive circuit;

[0007] The self-excited oscillation circuit includes an operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a first capacitor. The inverting input terminal of the operational amplifier is grounded through the first capacitor, the inverting input terminal of the operational amplifier is electrically connected to the output terminal of the operational amplifier through the fifth resistor, the non-inverting input terminal of the operational amplifier is grounded through the first resistor and the second resistor, the non-inverting input terminal of the operational amplifier is grounded through the third resistor, the non-inverting input terminal of the operational amplifier is electrically connected to the output terminal of the operational amplifier through the fourth resistor, the output terminal of the operational amplifier is externally connected to a 12V DC voltage power supply through the sixth resistor, and the output terminal of the operational amplifier is electrically connected to the input terminal of the full-bridge drive circuit.

[0008] Preferably, the full-bridge drive circuit includes a first transistor, a second transistor, a third transistor, a fourth transistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a fourteenth resistor. The first transistor and the third transistor are both NPN transistors, the second transistor and the fourth transistor are both PNP transistors, the collector of the first transistor and the collector of the third transistor are both externally connected to a 12V DC power supply, and the collector of the second transistor and the collector of the fourth transistor are both externally connected to a 12V DC power supply. are all grounded, the emitter of the first triode is electrically connected to the emitter of the second triode, the emitter of the third triode is electrically connected to the emitter of the fourth triode, two ends of the transmitting antenna are electrically connected to the emitter of the first triode and the emitter of the third triode respectively, the base of the first triode is grounded through the seventh resistor and the eighth resistor, the base of the second triode is grounded through the ninth resistor and the tenth resistor, the base of the third triode is grounded through the eleventh resistor and the twelfth resistor, and the base of the fourth triode is grounded through the thirteenth resistor and the fourteenth resistor.

[0009] Preferably, the transmitting antenna is composed of an inductor and a second capacitor in series, and the transmitting antenna adopts an LC resonant circuit, wherein the inductor has an inductance of L=16.7uH@125KHz, the capacitance of the second capacitor is C=150nf, and the resonant frequency is fLC=100.56KHz.

[0010] Preferably, the first resistor is an adjustable resistor, and the frequency output of the self-oscillation circuit can be achieved by adjusting the resistance value of the first resistor.

[0011] Preferably, the self-excited oscillation circuit is further electrically connected to a power conversion circuit, which is composed of a step-down circuit mainly composed of 78L05.

[0012] The beneficial effects of the present invention are as follows: in the fast frequency matching adjustment circuit, the frequency output of the self-excited oscillation circuit can be achieved by adjusting the resistance value of the first resistor, thereby satisfying the function of fast frequency matching. At the same time, both the self-excited oscillation circuit and the full-bridge drive circuit use conventional power components, which can greatly reduce the cost of the adjustment circuit, while also reducing maintenance costs and improving the practicality of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be described by way of examples with reference to the accompanying drawings, in which:

[0014] Figure 1 It is a circuit principle diagram of the utility model;

[0015] Figure 2 This is a circuit schematic diagram of the self-excited oscillation circuit of the utility model;

[0016] Figure 3This is a circuit principle diagram of the full-bridge drive circuit of the present utility model. DETAILED DESCRIPTION

[0017] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0018] like Figure 1-Figure 3 As shown, a fast frequency matching adjustment circuit includes a self-excited oscillation circuit, a full-bridge drive circuit and a transmitting antenna, wherein the self-excited oscillation circuit is electrically connected to the transmitting antenna through the full-bridge drive circuit;

[0019] The self-excited oscillation circuit includes an operational amplifier U1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a first capacitor C1. The inverting input terminal of the operational amplifier U1 is grounded through the first capacitor C1, and the inverting input terminal of the operational amplifier U1 is electrically connected to the output terminal of the operational amplifier U1 through the fifth resistor R5. The non-inverting input terminal of the operational amplifier U1 is grounded through the first resistor R1 and the second resistor R2, and the non-inverting input terminal of the operational amplifier U1 is grounded through the third resistor R3. The non-inverting input terminal of the operational amplifier U1 is electrically connected to the output terminal of the operational amplifier U1 through the fourth resistor R4. The output terminal of the operational amplifier U1 is externally connected to a 12V DC voltage power supply through the sixth resistor R6. The output terminal of the operational amplifier U1 is electrically connected to the input terminal of the full-bridge drive circuit. After the power is turned on, the self-excited oscillation circuit can generate a rectangular pulse wave or a square wave of a certain frequency and amplitude without an external contact signal. Among them, the frequency output of the self-excited oscillation circuit can be achieved by adjusting the resistance value of the first resistor R1, thereby meeting the function of fast frequency matching. Among them, the use of conventional power components can greatly reduce the cost of regulating the circuit, while also reducing maintenance costs and improving the practicality of the circuit.

[0020] Specifically, the full-bridge drive circuit includes a first transistor VT1, a second transistor VT2, a third transistor VT3, a fourth transistor VT4, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13 and a fourteenth resistor R14. The first transistor VT1 and the third transistor VT3 are both NPN transistors, the second transistor VT2 and the fourth transistor VT4 are both PNP transistors, the collector of the first transistor VT1 and the collector of the third transistor VT3 are both externally connected to a 12V DC power supply, the collector of the second transistor VT2 and the collector of the fourth transistor VT4 are both externally connected to a 12V DC power supply. All electrodes are grounded, the emitter of the first triode VT1 is electrically connected to the emitter of the second triode VT2, the emitter of the third triode VT3 is electrically connected to the emitter of the fourth triode VT4, the two ends of the transmitting antenna are electrically connected to the emitter of the first triode VT1 and the emitter of the third triode VT3 respectively, the base of the first triode VT1 is grounded through the seventh resistor R7 and the eighth resistor R8, the base of the second triode VT2 is grounded through the ninth resistor R9 and the tenth resistor R10, the base of the third triode VT3 is grounded through the eleventh resistor R11 and the twelfth resistor R12, and the base of the fourth triode VT4 is grounded through the thirteenth resistor R13 and the fourteenth resistor R14.

[0021] Specifically, the transmitting antenna is composed of an inductor L1 and a second capacitor C2 connected in series. The transmitting antenna adopts an LC resonant circuit, wherein the inductance of the inductor L1 is L=16.7uH@125KHz, the capacitance of the second capacitor C2 is C=150nf, and the resonant frequency is fLC=100.56KHz.

[0022] Specifically, the first resistor R1 is an adjustable resistor, and the frequency output of the self-excited oscillation circuit can be achieved by adjusting the resistance value of the first resistor R1.

[0023] Specifically, the self-excited oscillation circuit is also electrically connected to a power conversion circuit, which is composed of a step-down circuit mainly composed of 78L05.

[0024] The above description is based on the present invention. Based on the above description, relevant personnel can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the content of the specification. Its technical scope must be determined according to the scope of the claims.

Claims

1. A fast frequency matching adjustment circuit, characterized in that: It includes a self-excited oscillation circuit, a full-bridge drive circuit and a transmitting antenna, wherein the self-excited oscillation circuit is electrically connected to the transmitting antenna through the full-bridge drive circuit; The self-excited oscillation circuit includes an operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a first capacitor. The inverting input terminal of the operational amplifier is grounded through the first capacitor, the inverting input terminal of the operational amplifier is electrically connected to the output terminal of the operational amplifier through the fifth resistor, the non-inverting input terminal of the operational amplifier is grounded through the first resistor and the second resistor, the non-inverting input terminal of the operational amplifier is grounded through the third resistor, the non-inverting input terminal of the operational amplifier is electrically connected to the output terminal of the operational amplifier through the fourth resistor, the output terminal of the operational amplifier is externally connected to a 12V DC voltage power supply through the sixth resistor, and the output terminal of the operational amplifier is electrically connected to the input terminal of the full-bridge drive circuit.

2. The fast frequency matching adjustment circuit according to claim 1, characterized in that: The full-bridge drive circuit includes a first transistor, a second transistor, a third transistor, a fourth transistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a fourteenth resistor. The first transistor and the third transistor are both NPN transistors, the second transistor and the fourth transistor are both PNP transistors, the collectors of the first transistor and the third transistor are both externally connected to a 12V DC power supply, and the collectors of the second transistor and the fourth transistor are both grounded. The emitter of the first triode is electrically connected to the emitter of the second triode, the emitter of the third triode is electrically connected to the emitter of the fourth triode, the two ends of the transmitting antenna are electrically connected to the emitter of the first triode and the emitter of the third triode respectively, the base of the first triode is grounded through the seventh resistor and the eighth resistor, the base of the second triode is grounded through the ninth resistor and the tenth resistor, the base of the third triode is grounded through the eleventh resistor and the twelfth resistor, and the base of the fourth triode is grounded through the thirteenth resistor and the fourteenth resistor.

3. The fast matching frequency adjustment circuit according to claim 2, characterized in that: The transmitting antenna is composed of an inductor and a second capacitor connected in series.

4. The fast matching frequency adjustment circuit according to claim 1, characterized in that: The first resistor is an adjustable resistor.

5. The fast matching frequency adjustment circuit according to claim 1, characterized in that: The self-excited oscillation circuit is also electrically connected to a power conversion circuit, which is composed of a step-down circuit mainly composed of 78L05.

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