An ultrasonic generation and control circuit system

Abstract

The present invention discloses an ultrasonic wave generating and controlling circuit system. The circuit system includes a self-boosting ultrasonic wave generating circuit structure and an automatic control protection circuit structure. The automatic control protection circuit system includes a power supply control circuit, a synchronous control circuit, an overcurrent self-locking protection circuit and a synchronous conduction self-locking protection circuit. The present invention can be applied to ultrasonic wave generating devices, especially ultrasonic wave fuel excitation devices or humidifying devices, and has the characteristics of stable frequency, high power, low energy consumption and wide application range. And the effects of automatic control and self-boosting are realized.

Description

Technical Field

[0001] The present invention relates to a circuit system, in particular to an ultrasonic wave generating and controlling circuit system. Background Art

[0002] At present, the ultrasonic generating and control circuits used on the market are mostly used in humidification devices and other ultrasonic generating devices. The existing ultrasonic generating and control circuits are usually only suitable for stable circuits in ordinary households, and their frequencies are unstable, the heat generated is large, the power consumption is large, the scope of use is small, and there are many shortcomings. Summary of the invention

[0003] The present invention provides a circuit system for an ultrasonic fuel excitation device, which aims to solve the technical problems of unstable frequency, high heat generation, high power consumption and small application range in existing ultrasonic generation and control circuits.

[0004] The ultrasonic wave generation and control circuit system includes a self-boosting ultrasonic wave pressure generation circuit structure and an automatic control protection circuit structure, and the automatic control protection circuit system at least includes a power supply control circuit and a synchronous control circuit.

[0005] The self-boosting ultrasonic pressure generating circuit system is provided with a first high-frequency transformer (T1); the common input end (pin 1) of the first high-frequency transformer (T1) after the two primary windings are connected in series with each other in opposite ends is connected to the positive pole of the main power supply (VCC) through an eighth inductor (L8); the output ends (pins 2 and 3) of the two primary windings of the first high-frequency transformer (T1) are opposite to each other, that is, the output end of the primary winding; the output end (pin 2) of the first high-frequency transformer (T1) is connected in series with the positive pole of the third Schottky diode (SBD3); the negative pole of the third Schottky diode (SBD3) is connected to the drain (D pole) of the third switch tube N-MOSFET (VT3); the source (S pole) of the third switch tube N-MOSFET (VT3) is connected in series with a ninth inductor (L9) and then connected to the negative pole of the circuit main power supply; the gate (G pole) and source (S pole) of the third switch tube N-MOSFET (VT3) are connected in parallel with a first transient voltage suppression diode (TVS1), a third resistor (R3) and a third capacitor (C3). The source (S pole) of the third switch tube N-MOSFET (VT3) is connected to the positive pole of the first Schottky diode (SBD1), and the negative pole of the first Schottky diode (SBD1) is connected to the positive pole of the third Schottky diode (SBD3); the primary winding output end (pin 3) of the first high-frequency transformer (T1) is connected to the positive pole of the fourth Schottky diode (SBD4), and the negative pole of the fourth Schottky diode (SBD4) is connected to the drain (D pole) of the fourth switch tube N-MOSFET (VT4); the source (S pole) of the fourth switch tube N-MOSFET (VT4) is connected to the source (S pole) of the third switch tube N-MOSFET (VT3) and is connected in series with a ninth inductor (L9) and then connected to the negative pole of the main power supply (VCC); the gate (G pole) and the source (S pole) of the fourth switch tube N-MOS FET (VT4) are connected in parallel with a second transient voltage suppressor diode (TVS2), a fourth resistor (R4), and a fourth capacitor (C4). The source (S pole) of the fourth switch tube N-MOSFET (VT4) is connected to the positive pole of the second Schottky diode (SBD2), and the negative pole of the second Schottky diode (SBD2) is connected to the positive pole of the fourth Schottky diode (SBD4). The gate (G pole) of the third switch tube N-MOSFET (VT3) is connected in series with the first resistor (R1) and then connected to the negative pole of the third Schottky diode (SBD3); the gate (G pole) of the fourth switch tube N-MOSFET (VT4) is connected in series with the second resistor (R2) and then connected to the positive pole of the fourth Schottky diode (SBD4).

[0006] The power control circuit includes a power supply (ACC) for receiving a door lock control power supply, a first relay (KA1), a second switch tube N-MOSFET (VT2), and a main power supply (VCC) for controlling the first relay (KA1) and the second switch tube N-MOSFET (VT2) to be turned on or off. The electromagnetic control signal input terminal (pin 1) of the first relay (KA1) is connected to the cathode of the fourth diode (D4), and the anode of the fourth diode (D4) is connected to the anode of the power supply (ACC); the electromagnetic control signal output terminal (pin 2) of the first relay (KA1) is connected to the drain (D electrode) of the second switch tube N-MOSFET (VT2); the source of the second switch tube N-MOSFET (VT2) is connected to the cathode of the power supply (ACC); the second switch tube N-MOSFET (VT2) The gate (G pole) is connected in series with the tenth resistor (R10) and then connected to the positive pole of the fourth diode (D4); the gate (G pole) of the second switch tube N-MOSFET (VT2) is connected to the negative pole of the fourth voltage regulator tube (ZD4), and the source (S pole) of the second switch tube N-MOSFET (VT2) is connected to the positive pole of the fourth voltage regulator tube (ZD4); the power input end (pin 3) of the first relay (KA1) is connected in series with the fuse (F) and then connected to one end of the main switch (K); the other end of the main switch (K) is connected to the positive pole of the main power supply (VCC).

[0007] The synchronous control circuit includes a first optical coupler (N1) driven by a pulse width signal of an oil injector. The first optical coupler (N1) isolates and controls the first switch tube N-MOSFET (VT1) to turn on and off to drive the switch of a second relay (KA2), so that the oil injector can work in a synchronous state with an oil injection circuit, and realizes automatic control, safety, and convenience. The use of optical coupler drive can isolate the oil injection pulse signal and the circuit, and do not interfere with each other. The gate (G pole) and source (S pole) of the first switch tube N-MOSFET (VT1) are connected in parallel with a first capacitor (C1) and a sixth resistor (R6), which have a delay effect on the pulse width to stabilize the conduction state of the first switch tube N-MOSFET (VT1). The electromagnetic control signal input terminal (pin 1) of the second relay (KA2) is connected to the power input terminal (pin 3); the electromagnetic control signal output terminal (pin 2) of the second relay (KA2) is connected to the drain (D pole) of the first switch tube N-MOSFET (VT1), and the power input terminal (pin 3) of the second relay (KA2) is connected to the normally open terminal (pin 4) of the first relay (KA1); the source of the first switch tube N-MOSFET (VT1) is connected to the negative pole of the main power supply (VCC); the first switch tube N-MOSFET (V The gate of the first switch tube N-MOSFET (VT1) is connected to the cathode of the second voltage zener diode (VD2); the source of the first switch tube N-MOSFET (VT1) is connected to the anode of the second voltage zener diode (ZD2), and the gate and source of the first switch tube N-MOSFET (VT1) are connected in parallel with the first capacitor (C1) and the sixth resistor (R6); the normally closed end (pin 4) of the second relay (KA2) is connected in series with the seventeenth resistor (R17) and then connected to the anode of the first light-emitting diode (VD1), and the cathode of the first light-emitting diode (VD1) is connected to the cathode of the main power supply (VCC). The circuit synchronization state is indicated by the switching between the light-emitting diodes VD1 and VD2. The normally open end (pin 2) of the second relay (KA2) is connected to the anode of the fifth Schottky diode (SBD5) at the end of the main power supply (VCC), and the cathode of the fifth Schottky diode (SBD5) serves as the anode of the positive output terminal (Vo) of the automatic control protection circuit.

[0008] As one of the preferred implementations, the automatic control protection circuit system also includes a synchronous abnormality self-locking protection circuit, which includes a first optocoupler (N1), wherein the signal input positive terminal (pin 1) of the first optocoupler (N1) and the endpoint connected in series with the eighteenth resistor (R18) serve as the positive connection terminal of the pulse signal connection (IN) to the injector; the signal input negative terminal (pin 2) of the first optocoupler (N1) serves as the negative connection terminal of the pulse signal (IN) to the injector; the signal output positive terminal (pin 3) of the first optocoupler (N1) and the thirteenth resistor (R13) are connected in series to the power input terminal (pin 3) of the second relay (KA2); and the signal output negative terminal (pin 4) of the first optocoupler (N1) is connected to the gate (pole G) of the first switch tube N-MOSFET (VT1).

[0009] As one of the preferred implementations, the synchronous abnormality self-locking protection circuit also includes a unidirectional thyristor (SCR), the anode (A pole) of the unidirectional thyristor (SCR) is connected to the cathode of the third light-emitting diode (VD3), the anode of the third light-emitting diode (VD3) is connected in series with the twelfth resistor (R12) and then connected to the power input terminal (3 pin) of the first relay (KA1); the control electrode (G pole) of the unidirectional thyristor (SCR) is connected to the cathode of the third voltage-stabilizing diode (ZD3), and the anode of the third voltage-stabilizing diode (ZD3) is connected to the cathode (K pole) of the unidirectional thyristor (SCR); the control electrode (G pole) of the unidirectional thyristor (SCR) is connected to The cathode (K pole) is connected in parallel with a ninth resistor (R9) and a ninth capacitor (C9); the third optocoupler (N3) signal input positive terminal (pin 1) is connected in series with an eleventh resistor (R11) and then connected to the first relay (KA1) power input terminal (pin 3); the third optocoupler (N3) signal input negative terminal (pin 2) is connected to the anode (pole A) of a unidirectional thyristor (SCR); the third optocoupler signal output positive terminal (pin 3) is connected to the gate (pole G) of the second switch tube N-MOSFET (VT2); the third optocoupler (N3) signal output negative terminal (pin 4) is connected to the source (pole S) of the second switch tube N-MOSFET (VT2).

[0010] As one of the preferred implementations, the synchronous abnormality self-locking protection circuit includes a first transistor (Q1), wherein the base collector (pole b) of the first transistor (Q1) is connected in series with a seventh resistor (R7) and then connected to a gate (pole G) of a first switch tube N-MOSFET (VT1); one path of the collector (pole C) of the first transistor (Q1) is connected in series with the positive electrode of a sixth diode (D6) and then connected to a control electrode (pole G) of a unidirectional thyristor (SCR); the other path is connected in series with a fifth resistor (R5) and then connected to a normally open end (5) of a second relay (KA2); and the emitter (pole e) of the first transistor (Q1) is connected to a negative electrode of a main power supply (VCC).

[0011] As one of the preferred implementations, the overcurrent self-locking protection circuit includes a sampling resistor (RS) connected in series to the negative electrode of the main power supply (VCC), and the overcurrent detection chip (IC) signal in-phase input terminal (pin 1) is connected to the low potential end of the sampling resistor (RS); the positive pole (pin 5) of the voltage-stabilized power input terminal of the overcurrent detection chip (IC) is connected in series with the fifteenth resistor (R15) and then connected in series with the fourteenth resistor (R14) and finally connected to the high potential end of the sampling resistor (RS); the other way is connected in series with the twentieth resistor (R20) and then connected to the overcurrent detection (IC) signal output terminal (pin 3); the overcurrent detection (IC) signal inverting input terminal (pin 2) is connected to the fifteenth resistor (R15) and the tenth resistor (R14); the overcurrent detection (IC) signal inverting input terminal (pin 3) is connected to the fifteenth resistor (R15) and the tenth resistor (R14); the overcurrent detection (IC) signal inverting input terminal (pin 2 ... The midpoint of the four resistors (R14) connected in series is connected; the overcurrent detection (IC) (pin 4) is connected to the negative pole of the power supply; the overcurrent detection (IC) signal output terminal (pin 3) is connected in series with the sixteenth resistor (R16) and then connected to the second optocoupler (N2) signal input positive terminal (pin 1); the second optocoupler (N2) signal input negative terminal (pin 2) is connected to the negative pole of the power supply (∨CC1); the second optocoupler (N2) signal output positive terminal (pin 1) is connected in series with the nineteenth resistor (R19) and then connected to the positive pole of the electric door lock control power supply (ACC); the second optocoupler (N2) signal output negative terminal (pin 4) is connected in series with the positive pole of the fifth diode (D5) and then connected to the control pole (G pole) of the unidirectional thyristor (SCR).

[0012] As one of the preferred implementations, the positive terminal of the main power supply (VCC) in the automatic control protection circuit is connected to one end of the main switch (K), the other end of the main switch is connected in series with a fuse (F) and then connected to the power supply end (pin 3) of the first relay (KA1), the positive electrode of the eighth capacitor (C8) is connected to the normally open end (pin 4) of the first relay (KA1), and the negative electrode of the eighth capacitor (C8) is connected to the negative electrode of the main power supply (VCC). The normally open end (pin 5) of the second relay (KA2) is connected to the positive electrode of the fifth Schottky diode (SBD5); the negative electrode of the fifth Schottky diode (SBD5) serves as the positive electrode of the output end (Vo) of the automatic control protection circuit.

[0013] As one of the preferred implementations, the on and off of the circuit main power supply (VCC) is controlled by the on and off of the power supply of the electric door lock control (ACC).

[0014] As one of the preferred implementations, the fuel injector pulse signal is isolated and coupled by the first optical coupler (N1) to synchronously control the on and off of the main power supply (VCC) through a control circuit without interfering with the fuel injector pulse signal source.

[0015] As one of the preferred implementations, when the injector pulse signal and the main power supply (VCC) are not synchronized and the circuit has an overcurrent fault, the circuit will promptly lock and disconnect the main power supply (VCC) to provide protection.

[0016] As one of the preferred implementations, in the self-boosting ultrasonic generating circuit, the gate (G pole) of the third switch tube N-MOSFET (VT3) is connected in series with the secondary winding inductor (L2) of the second high-frequency transformer (T2) and the second capacitor (C2) and then connected to the gate (G pole) of the fourth switch tube N-MOSFET (VT4).

[0017] As one of the preferred embodiments, in the self-boosting ultrasonic generating circuit, the gate (G pole) of the third switch tube N-MOSFET (VT3) is connected in series with the third inductor (L3) and then connected to the positive pole of the first diode (D1), the negative pole of the first diode (D1) is connected to the negative pole of the first voltage stabilizing diode (ZD1), and the positive pole of the first voltage stabilizing diode (ZD1) is connected in series with the ninth inductor (L9) and then connected to the negative pole of the main power supply (VCC). The gate (G pole) of the fourth switch tube N-MOSFET (VT4) is connected in series with the fourth inductor (L4) and then connected to the positive pole of the second diode (D2), and the negative pole of the second diode (D2) is connected to the negative pole of the first voltage stabilizing diode (ZD1); the positive pole and the negative pole of the first voltage stabilizing diode (ZD1) are connected in parallel with a fifth capacitor (C5).

[0018] As one of the preferred implementations, in the self-boosting ultrasonic generating circuit, the secondary winding output end (pin 5) of the first high-frequency transformer (T1) is connected in series with the primary winding inductor (L5) of the second high-frequency transformer (T2) and the first capacitor (C1) in sequence, and then connected to the secondary output end (pin 4) of the first transformer (T1); the secondary output end (pin 5) of the first high-frequency transformer (T1) is connected in series with the primary preset adjustable multi-winding inductor (L1) of the third high-frequency transformer (T3) and the ultrasonic transducer or device (X) in sequence, and then connected to the secondary output end (pin 4) of the first high-frequency transformer (T1).

[0019] As one of the preferred implementations, in the self-boosting ultrasonic generating circuit, the two ends of the output winding inductor (L6) of the third high-frequency transformer (T3) are connected to the two AC input ends of the third high-frequency rectifier bridge (D3), the positive end of the third high-frequency rectifier bridge (D3) is connected in series with the twenty-first resistor (R21) and then connected to the positive electrode of the fourth light-emitting diode (VD4), and the negative electrode of the fourth light-emitting diode (VD4) is connected to the negative end of the third high-frequency rectifier bridge.

[0020] As one of the preferred implementations, a sixth capacitor (C6) and a seventh capacitor (C7) are connected in parallel between the positive electrode and the negative electrode of the main power supply (VCC).

[0021] As one of the preferred implementations, a series frequency-selective resonant circuit composed of a third capacitor (C3), a second inductor (L2), a second capacitor (C2), and a fourth capacitor (C4) provides a driving current for the gate (G pole) of the third switch tube N-MOSFET (VT3) and the gate (G pole) of the fourth switch tube N-MOSFET (VT4). The circuit has the characteristics of small driving current, easy driving, high resonant circuit Q value, good frequency selection characteristics, and stable frequency.

[0022] As one of the preferred implementations, a DC voltage-stabilized starting circuit consisting of a first resistor (R1), a third inductor (L3), a first diode (D1), a second resistor (R2), a fourth inductor (L4), a first voltage-stabilizing diode (ZD1), and a fifth capacitor (C5) provides a stable and appropriate starting DC voltage for the gate (G pole) of the third switch tube N-MOSFET (VT3) and the gate (G pole) of the fourth switch tube N-MOSFET (VT4).

[0023] As one of the preferred implementation methods, the output end (pin 5, pin 4) of the secondary winding of the first high-frequency transformer (T1) is connected in parallel with a series branch consisting of a primary winding inductor (L5) of a second high-frequency transformer (T2) and a first capacitor (C1), and a series branch consisting of a primary multi-winding preset adjustable inductor (L1) of a third high-frequency transformer (T3) and an ultrasonic transducer device (X). The two series branches are connected in parallel to form an equivalent parallel resonant circuit. The resonant frequency of the parallel resonant circuit is coupled and fed back to a series drive circuit consisting of a second inductor (L2), a second capacitor (C2), a fourth capacitor (C4), and a third capacitor (C3) connected in series in sequence through the secondary winding (L5) of the second high-frequency transformer, and provides a drive frequency and a drive current for the series drive circuit.

[0024] As one of the preferred implementations, the third Schottky diode (SBD3) can prevent reverse current from flowing through the source (S pole) drain (D pole) of the third switch tube N-MOSFET (VT3); the first Schottky diode (SBD1) provides a reverse current channel for the source (S pole) drain (D pole) of the third switch tube N-MOSFET (VT3); the fourth Schottky diode (SBD4) can prevent reverse current from flowing through the source (S pole) drain (D pole) of the fourth switch tube N-MOSFET (VT4); the second Schottky diode (SBD2) provides a reverse current channel for the source (S pole) drain (D pole) of the fourth switch tube N-MOSFET (VT4).

[0025] The invention can be applied to ultrasonic generating devices, especially ultrasonic fuel excitation devices or humidifying devices, and has the characteristics of stable frequency, high power, low energy consumption, and wide application range, and can realize the effects of automatic control and self-boosting. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a self-boosting ultrasonic generating circuit according to one embodiment of the present invention.

[0027] Figure 2 A schematic diagram of an automatic control protection circuit according to one embodiment of the present invention. DETAILED DESCRIPTION

[0028] The structure of the ultrasonic fuel excitation device of the present invention is further described by the following embodiments:

[0029] In the present invention, since different devices have different power supply voltages, the control (sensor) signal acquisition location methods are also different. For the convenience of description, a fuel vehicle is taken as an example.

[0030] like Figure 1The present invention is a schematic diagram of a self-boosting ultrasonic wave generating circuit of an embodiment. A first high-frequency transformer T1 is provided in the self-boosting ultrasonic wave generating circuit system. The common input terminal (pin 1) of the two primary windings of the first high-frequency transformer T1, which are connected in parallel with each other at opposite ends, is connected in series with the positive electrode of the main power supply VCC through the eighth inductor L8; the first high-frequency transformer T1 has two primary windings with output terminals (pins 2 and 3) in opposite directions, that is, the primary winding output terminal; the output terminal (pin 2) of the first high-frequency transformer T1 is connected in series with the positive electrode of the third Schottky diode SBD3, and the negative electrode of the third Schottky diode SBD3 is connected to the drain electrode (D electrode) of the third switch tube N-MOSFET (VT3); the source electrode (S electrode) of the third switch tube N-MOSFET (VT3) is connected in series with the ninth inductor L9 and is connected to the negative electrode of the main power supply VCC; the gate electrode (G electrode) and the source electrode (S electrode) of the third switch tube N-MOSFET (VT3) are connected in parallel with the first transient voltage suppression diode TVS1, the third resistor R3, and the third capacitor C3. The source (S pole) of the third switch tube N-MOSFET (VT3) is connected to the positive pole of the first Schottky diode SBD1, and the negative pole of the first Schottky diode SBD1 is connected to the positive pole of the third Schottky diode SBD3; the primary winding output end (pin 3) of the first high-frequency transformer T1 is connected to the positive pole of the fourth Schottky diode SBD4, and the negative pole of the fourth Schottky diode SBD4 is connected to the drain (D pole) of the fourth switch tube N-MOSFET (VT4); the source (S pole) of the fourth switch tube N-MOSFET (VT4) is connected to the source (S pole) of the third switch tube N-MOSFET (VT3) and is connected in series with the ninth inductor L9 and then connected to the negative pole of the main power supply of the circuit; the gate (G pole) and the source (S pole) of the fourth switch tube N-MOS FET (VT4) are connected in parallel with the second transient voltage suppression diode TVS2, the fourth resistor R4, and the fourth capacitor C4. The source (S pole) of the fourth switch tube N-MOSFET (VT4) is connected to the anode of the second Schottky diode SBD2, and the cathode of the second Schottky diode SBD2 is connected to the anode of the fourth Schottky diode SBD4. The gate (G pole) of the third switch tube N-MOSFET (VT3) is connected in series with the first resistor R1 and then connected to the cathode of the third Schottky diode SBD3; the gate (G pole) of the fourth switch tube N-MOSFET (VT4) is connected in series with the second resistor R2 and then connected to the anode of the fourth Schottky diode SBD4.

[0031] The gate (G pole) of the third switch tube N-MOSFET (VT3) is connected to one end of the secondary winding inductor L2 of the second high-frequency transformer T2, and the secondary winding inductor L2 of the high-frequency transformer T2 is connected in series with the second capacitor C2 and then connected to the gate (G pole) of the fourth switch tube N-MOSFET (VT4).

[0032] The gate (G pole) of the third switch tube N-MOSFET (VT3) is connected in series with the third inductor L3 and then connected to the positive pole of the first diode D1, the negative pole of the first diode D1 is connected to the negative pole of the first voltage stabilizing diode ZD1, the positive pole of the first voltage stabilizing diode ZD1 is connected in series with the ninth inductor L9 and then connected to the negative pole of the main power supply of the circuit. The gate (G pole) of the fourth switch tube N-MOSFET (VT4) is connected in series with the fourth inductor L4 and then connected to the positive pole of the second diode D2, the negative pole of the second diode D2 is connected to the negative pole of the first voltage stabilizing diode ZD1; the positive pole and the negative pole of the first voltage stabilizing diode ZD1 are connected in parallel with the fifth capacitor C5.

[0033] The secondary winding output end (pin 5) of the first high-frequency transformer T1 is connected to one end of the primary winding inductor L5 of the second high-frequency transformer T2, and the other end of the secondary winding inductor L5 of the second high-frequency transformer T2 is connected in series with the first capacitor C1 and then connected to the secondary output end (pin 4) of the first transformer T1; the secondary output end (pin 5) of the first high-frequency transformer T1 is connected to one end of the primary preset adjustable multi-winding inductor L1 of the third high-frequency transformer T3, and the other end of the primary preset adjustable multi-winding inductor L1 of the third high-frequency transformer T3 is connected in series with the ultrasonic transducer or device X and then connected to the secondary output end (pin 4) of the first high-frequency transformer T1. The two ends of the output winding inductor L6 of the third high-frequency transformer T3 are connected to the two AC input ends of the third high-frequency rectifier bridge D3, and the positive end of the third high-frequency rectifier bridge D3 is connected in series with the twenty-first resistor R21 and then connected to the positive electrode of the fourth light-emitting diode VD4, and the negative electrode of the fourth light-emitting diode VD4 is connected to the negative end of the third high-frequency rectifier bridge.

[0034] The sixth capacitor C6 and the seventh capacitor C7 are connected in parallel between the positive and negative electrodes of the main power supply VCC. The series frequency-selective resonant circuit composed of the third capacitor C3, the second inductor L2, the second capacitor C2, and the fourth capacitor C4 provides a driving current for the gate (G pole) of the third switch tube N-MOSFET (VT3) and the gate (G pole) of the fourth switch tube N-MOSFET (VT4). The circuit has the characteristics of small driving current, easy driving, high resonant circuit Q value, good frequency-selective characteristics, and stable frequency.

[0035] A DC voltage stabilizing startup circuit consisting of a first resistor R1, a third inductor L3, a first diode D1, a second resistor R2, a fourth inductor L4, a first voltage stabilizing diode ZD1, and a fifth capacitor C5 provides a stable and appropriate starting DC voltage for the gate (G pole) of the third switch tube N-MOSFET (VT3) and the gate (G pole) of the fourth switch tube N-MOSFET (VT4).

[0036] The output end (pin 5, pin 4) of the secondary winding of the first high-frequency transformer T1 is connected in parallel with a series branch consisting of the primary winding inductor L5 of the second high-frequency transformer T2 and the first capacitor C1, and a series branch consisting of the primary multi-winding preset adjustable inductor L1 of the third high-frequency transformer T3 and the ultrasonic transducer device X. The two series branches are connected in parallel to form an equivalent parallel resonant circuit. The resonant frequency of the parallel resonant circuit is coupled and fed back to the series drive circuit composed of the second inductor L2, the second capacitor C2, the fourth capacitor C4, and the third capacitor C3 connected in series in sequence through the secondary winding L5 of the second high-frequency transformer, and provides a drive frequency and a drive current for it.

[0037] The third Schottky diode SBD3 can prevent reverse current from flowing through the source (S pole) drain (D pole) of the third switch tube N-MOSFET (VT3); the first Schottky diode (SBD1) provides a reverse current channel for the source (S pole) drain (D pole) of the third switch tube N-MOSFET (VT3); the fourth Schottky diode SBD4 can prevent reverse current from flowing through the source (S pole) drain (D pole) of the fourth switch tube N-MOSFET (VT4); the second Schottky diode SBD2 provides a reverse current channel for the source (S pole) drain (D pole) of the fourth switch tube N-MOSFET (VT4).

[0038] like Figure 2 The figure shows the automatic control protection circuit diagram of the ultrasonic fuel excitation device, which includes the following circuit structure:

[0039] The automatic control protection circuit system includes a power supply control circuit, a synchronous control circuit, an overcurrent self-locking protection circuit and a synchronous conduction self-locking protection circuit.

[0040] The power control circuit includes a first relay KA1, the electromagnetic control signal input terminal (pin 1) of the first relay KA1 is connected to the cathode of the fourth diode D4, and the anode of the fourth diode D4 is connected to the anode of the power door lock control power supply ACC; the electromagnetic control signal output terminal (pin 2) of the first relay KA1 is connected to the drain (D pole) of the second switch tube N-MOSFET (VT2); the source (S pole) of the second switch tube N-MOSFET (VT2) is connected to the cathode of the power door lock control power supply ACC. The power door lock is used to control the conduction and cutoff of the ACC power supply to control the conduction and cutoff of the circuit main power supply VCC. The gate (G pole) of the second switch tube N-MOSFET (VT2) is connected in series with the tenth resistor R10 and then connected to the positive pole of the fourth diode D4; the gate (G pole) of the second switch tube N-MOSFET (VT2) is connected to the negative pole of the fourth voltage regulator tube ZD4, and the source (S pole) of the second switch tube N-MOSFET (VT2) is connected to the positive pole of the fourth voltage regulator tube ZD4; the power input end (pin 3) of the first relay KA1 is connected in series with the fuse F and then connected to one end of the main switch K; the other end of the main switch K is connected to the positive pole of the main power supply VCC. The positive pole of the eighth capacitor C8 is connected to the normally open end (pin 4) of the first relay KA1, and the negative pole of the eighth capacitor C8 is connected to the negative pole of the main power supply VCC. The normally open end (pin 5) of the second relay KA2 is connected to the positive pole of the fifth Schottky diode SBD5; the negative pole of the fifth Schottky diode SBD5 serves as the positive pole of the output end Vo of the automatic control protection circuit.

[0041] The synchronous control circuit includes a second relay KA2, wherein the electromagnetic control signal input terminal (pin 1) of the second relay KA2 is connected to the power input terminal (pin 3); the electromagnetic control signal output terminal (pin 2) of the second relay KA2 is connected to the drain (D pole) of the first switch tube N-MOSFET (VT1), and the power input terminal (pin 3) of the second relay KA2 is connected to the normally open terminal (pin 4) of the first relay KA1; the source (S pole) of the first switch tube N-MOSFET (VT1) is connected to the negative pole of the main power supply VCC; the gate (G pole) of the first switch tube N-MOSFET (VT1) is connected to the negative pole of the second voltage regulator diode VD2; the first switch The source (S pole) of the tube N-MOSFET (VT1) is connected to the positive pole of the second voltage stabilizing diode ZD2, and the gate and source of the first switch tube N-MOSFET (VT1) are connected in parallel with the first capacitor C1 and the sixth resistor R6; the normally closed end (pin 4) of the second relay KA2 is connected to the positive pole of the first light-emitting diode VD1 after being connected in series with the seventeenth resistor R17, and the negative pole of the first light-emitting diode VD1 is connected to the negative pole of the main power supply VCC; the normally open end (pin 2) of the second relay KA2 is connected to the positive pole of the fifth Schottky diode SBD5 at the end of the main power supply VCC, and the negative pole of the fifth Schottky diode SBD5 serves as the positive pole of the positive output terminal Vo of the automatic control protection circuit.

[0042] The abnormal synchronization self-locking protection circuit can prevent the failure of the second relay KA2 and the asynchronism of the injector pulse signal, thereby causing damage to the ultrasonic transducer and circuit. It includes a first optocoupler N1, the first optocoupler N1 signal input positive terminal (pin 1) and the eighteenth resistor R18 are connected in series as the positive connection terminal IN of the injector pulse signal; the first optocoupler N1 signal input negative terminal (pin 2) is used as the negative connection terminal IN of the injector pulse signal; the first optocoupler N1 signal output positive terminal (pin 3) and the thirteenth resistor R13 are connected in series and connected to the second relay KA2 power input terminal (pin 3); the first optocoupler N1 signal output negative terminal (pin 4) is connected to the gate (G) of the first switch tube N-MOSFET (VT1). The anode (A pole) of the unidirectional thyristor SCR is connected to the cathode of the third light-emitting diode VD3, the anode of the third light-emitting diode VD3 is connected in series with the twelfth resistor R12 and then connected to the power input terminal (pin 3) of the first relay KA1; the control pole (G pole) of the unidirectional thyristor SCR is connected to the cathode of the third voltage-stabilizing diode ZD3, and the anode of the third voltage-stabilizing diode ZD3 is connected to the cathode (K pole) of the unidirectional thyristor SCR; the control pole (G pole) of the unidirectional thyristor SCR and the cathode (K pole) are connected in parallel with the ninth resistor R9 and the ninth capacitor C9 , the third optocoupler N3 signal input positive terminal (pin 1) is connected in series with the eleventh resistor R11 and then connected to the power input terminal (pin 3) of the first relay KA1; the third optocoupler N3 signal input negative terminal (pin 2) is connected to the anode (pole A) of the unidirectional thyristor SCR; the third optocoupler signal output positive terminal (pin 3) is connected to the gate (pole G) of the second switch tube N-MOSFET (VT2); the third optocoupler N3 signal output negative terminal (pin 4) is connected to the source (pole S) of the second switch tube N-MOSFET (VT2). The first transistor Q1 base collector (pole b) is connected in series with the seventh resistor R7 and then connected to the gate (pole G) of the first switch tube N-MOSFET (VT1); the first transistor Q1 collector C pole is connected in series with the positive pole of the sixth diode D6 and then connected to the control pole (pole G) of the unidirectional thyristor SCR; the other way is connected in series with the fifth resistor R5 and then connected to the normally open end (pin 5) of the second relay KA2; the first transistor Q1 emitter (pole e) is connected to the negative pole of the main power supply VCC. The fuel injector pulse signal is isolated and coupled by the first optical coupler N1. The pulse signal is used to synchronously control the on and off of the main power supply VCC through the control circuit without interfering with the fuel injector pulse signal source. When the fuel injector pulse signal is not synchronized with the main power supply VCC and the circuit has an overcurrent fault, the circuit will lock and disconnect the main power supply VCC in time to play a protective role.

[0043] The overcurrent self-locking protection circuit includes a sampling resistor RS connected in series with the negative electrode of the main power supply VCC. The overcurrent detection chip IC signal in-phase input terminal (pin 1) is connected to the low potential end of the sampling resistor RS; the positive pole (pin 5) of the overcurrent detection chip IC voltage-stabilized power input terminal is connected in series with the fifteenth resistor R15 and then connected in series with the fourteenth resistor R14 and finally connected to the high potential end of the sampling resistor RS; the other way is connected in series with the twentieth resistor R20 and then connected to the overcurrent detection IC signal output terminal (pin 3); the overcurrent detection IC signal inverting input terminal (pin 2) is connected to the fifteenth resistor R15 and the fourteenth resistor R1 4 are connected in series; the overcurrent detection IC (pin 4) is connected to the negative pole of the power supply; the overcurrent detection IC signal output terminal (pin 3) is connected in series with the second optocoupler N2 signal input positive terminal (pin 1) through the sixteenth resistor R16; the second optocoupler N2 signal input negative terminal (pin 2) is connected to the negative pole of the power supply; the second optocoupler N2 signal output positive terminal (pin 1) is connected in series with the nineteenth resistor R19 and then connected to the positive pole of the electric door lock control power supply ACC; the second optocoupler N2 signal output negative terminal (pin 4) is connected in series with the positive pole of the fifth diode D5 and then connected to the control pole (G pole) of the unidirectional thyristor SCR.

[0044] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An ultrasonic generation and control circuit system, characterized in that: The ultrasonic generation and control circuit system includes a self-boosting ultrasonic generation circuit structure and an automatic control protection circuit structure. The self-boosting ultrasonic generating circuit structure is provided with a first high-frequency transformer (T1); the common input end (pin 1) of the first high-frequency transformer (T1) after two primary windings are connected in series with each other in opposite ends is connected to the main power supply (VCC) through an eighth inductor (L8); the first high-frequency transformer (T1) has two primary windings with output ends (pins 2 and 3) in opposite ends, i.e., the primary winding output end; the output end (pin 2) of the first high-frequency transformer (T1) is connected in series with a third Schottky diode (SBD3); the third Schottky diode (SBD3) is connected to the drain (D pole) of the third switch tube N-MOSFET (VT3); the source (S pole) of the third switch tube N-MOSFET (VT3) is connected in series with a ninth inductor (L9) and is connected to the main power supply (VCC); the gate (G pole) and source (S pole) of the third switch tube N-MOSFET (VT3) are connected to the main power supply (VCC); ) is connected in parallel with a first transient voltage suppression diode (TVS1), a third resistor (R3), and a third capacitor (C3); the source (S pole) of the third switch tube N-MOSFET (VT3) is connected to the first Schottky diode (SBD1), and the first Schottky diode (SBD1) is connected to the third Schottky diode (SBD3); the primary winding output end (pin 3) of the first high-frequency transformer (T1) is connected to a fourth Schottky diode (SBD4), and the fourth Schottky diode (SBD4) is connected to the drain (D pole) of the fourth switch tube N-MOSFET (VT4), the source (S pole) of the fourth switch tube N-MOSFET (VT4) is connected to the source (S pole) of the third switch tube N-MOSFET (VT3) and then connected to one end of the ninth inductor (L9), and the other end of the ninth inductor (L9) is connected to the main power supply (VCC); the fourth switch tube N - A second transient voltage suppression diode (TVS2), a fourth resistor (R4), and a fourth capacitor (C4) are connected in parallel between the gate (G) and source (S) of the MOS FET (VT4); the source (S) of the fourth switch tube N-MOSFET (VT4) is connected to the second Schottky diode (SBD2), and the second Schottky diode (SBD2) is connected to the fourth Schottky diode (SBD4); the gate (G) of the third switch tube N-MOSFET (VT3) is connected in series with the first resistor (R1) and then connected to the third Schottky diode (SBD3); the gate (G) of the fourth switch tube N-MOSFET (VT4) is connected in series with the second resistor (R2) and then connected to the fourth Schottky diode (SBD4); The automatic control protection circuit structure comprises A power control circuit includes a power receiving door lock control power supply (ACC), a first relay (KA1), a second switch tube N-MOSFET (VT2), and a main power supply (VCC) for controlling the first relay (KA1) and the second switch tube N-MOSFET (VT2) to be turned on or off; and a synchronous control circuit includes a first optical coupler (N1) driven by a pulse width signal, the first optical coupler (N1) is isolated and controls the first switch tube N-MOSFET (VT1) to be turned on and off to drive the second relay (KA2), and the gate (G pole) and source (S pole) of the first switch tube N-MOSFET (VT1) are connected in parallel with a first capacitor (C1) and a sixth resistor (R6).

2. The ultrasonic generating and controlling circuit system according to claim 1, characterized in that: The automatic control protection circuit structure also includes a synchronous abnormality self-locking protection circuit, wherein the endpoint after the signal input positive terminal (pin 1) of the first optical coupler (N1) is connected in series with the eighteenth resistor (R18) is used as the positive connection terminal for connecting the pulse signal (IN) from the injector; the signal input negative terminal (pin 2) of the first optical coupler (N1) is used as the negative connection terminal for connecting the pulse signal (IN) from the injector; the signal output positive terminal (pin 3) of the first optical coupler (N1) is connected to the power input terminal (pin 3) of the second relay (KA2); the signal output negative terminal (pin 4) of the first optical coupler (N1) is connected to the gate (pole G) of the first switch tube N-MOSFET (VT1).

3. The ultrasonic generating and controlling circuit system as claimed in claim 2, characterized in that: The synchronous abnormality self-locking protection circuit also includes a unidirectional thyristor (SCR), the anode (pole A) of the unidirectional thyristor (SCR) is connected to a third light-emitting diode (VD3), the third light-emitting diode (VD3) is connected in series with a twelfth resistor (R12) and then connected to the power input terminal (pin 3) of the first relay (KA1); the control electrode (pole G) of the unidirectional thyristor (SCR) is connected to a third voltage-stabilizing diode (ZD3), and the third voltage-stabilizing diode (ZD3) is connected to the cathode (pole K) of the unidirectional thyristor (SCR); the control electrode (pole G) and the cathode (pole K) of the unidirectional thyristor (SCR) are connected in parallel with a ninth resistor (R9) and a ninth capacitor (C9), the signal input positive terminal (pin 1) of the third optical coupler (N3) is connected in series with an eleventh resistor (R11) and then connected to the power input terminal (pin 3) of the first relay (KA1); the signal input negative terminal (pin 2) of the third optical coupler (N3) is connected to the unidirectional thyristor (S The anode (A) of the first transistor (Q1) and the control electrode (G) of the first transistor (Q1) are connected to the anode (A) of the first transistor (Q1); the positive terminal (pin 3) of the signal output of the third optocoupler (N3) is connected to the gate (G) of the second switch tube N-MOSFET (VT2); the negative terminal (pin 4) of the signal output of the third optocoupler (N3) is connected to the source (S) of the second switch tube N-MOSFET (VT2); the synchronous abnormality self-locking protection circuit also includes a first transistor (Q1); the base collector (pole b) of the first transistor (Q1) is connected in series with the seventh resistor (R7) and then connected to the gate (G) of the first switch tube N-MOSFET (VT1); one path of the collector (pole C) of the first transistor (Q1) is connected in series with the sixth diode (D6) and then connected to the control electrode (G) of the unidirectional thyristor (SCR); the other path is connected in series with the fifth resistor (R5) and then connected to the normally open end (pin 5) of the second relay (KA2); the emitter (pole e) of the first transistor (Q1) is connected to the negative electrode of the main power supply (VCC).

4. The ultrasonic generating and controlling circuit system according to claim 1, characterized in that: The automatic control protection circuit structure also includes an overcurrent self-locking protection circuit, which includes a sampling resistor (RS) connected in series with the negative electrode of the main power supply (VCC), and the overcurrent detection chip (IC) signal in-phase input terminal (pin 1) is connected to the low potential end of the sampling resistor (RS); the positive pole (pin 5) of the voltage-stabilized power input terminal of the overcurrent detection chip (IC) is connected in series with the fifteenth resistor (R15) and then connected in series with the fourteenth resistor (R14) and finally connected to the high potential end of the sampling resistor (RS); the other way is connected in series with the twentieth resistor (R20) and then connected to the overcurrent detection (IC) signal output terminal (pin 3); the overcurrent detection (IC) signal inverting input terminal (pin 2) is connected to the fifteenth resistor (R15) and then connected to the fourteenth resistor (R14) and finally connected to the high potential end of the sampling resistor (RS). The resistor (R15) is connected to the midpoint of the series connection of the fourteenth resistor (R14); the overcurrent detection IC (pin 4) is connected to the negative pole of the power supply; the overcurrent detection IC signal output terminal (pin 3) is connected to the positive terminal (pin 1) of the signal input of the second optocoupler (N2) after being connected in series with the sixteenth resistor (R16); the negative terminal (pin 2) of the signal input of the second optocoupler (N2) is connected to the negative pole of the power supply; the positive terminal (pin 1) of the signal output of the second optocoupler (N2) is connected in series with the nineteenth resistor (R19) and then connected to the positive pole of the power door lock control power supply (ACC); the negative terminal (pin 4) of the signal output of the second optocoupler (N2) is connected in series with the positive pole of the fifth diode (D5) and then connected to the control pole (G pole) of the unidirectional thyristor (SCR).

5. The ultrasonic generating and controlling circuit system according to claim 1, characterized in that: In the self-boosting ultrasonic generating circuit, the gate (G pole) of the third switch tube N-MOSFET (VT3) is connected to one end of the secondary winding inductor (L2) of the second high-frequency transformer (T2), and the other end of the secondary winding inductor (L2) of the second high-frequency transformer (T2) is connected in series with the second capacitor (C2) and then connected to the gate (G pole) of the fourth switch tube N-MOSFET (VT4).

6. The ultrasonic generating and controlling circuit system according to claim 1, characterized in that: In the self-boosting ultrasonic generating circuit, the gate (G pole) of the third switch tube N-MOSFET (VT3) is connected in series with the third inductor (L3) and then connected to the positive pole of the first diode (D1), the negative pole of the first diode (D1) is connected to the negative pole of the first voltage-stabilizing diode (ZD1), the positive pole of the first voltage-stabilizing diode (ZD1) is connected in series with the ninth inductor (L9) and then connected to the negative pole of the main power supply (VCC); the gate (G pole) of the fourth switch tube N-MOSFET (VT4) is connected in series with the fourth inductor (L4) and then connected to the positive pole of the second diode (D2), and the negative pole of the second diode (D2) is connected to the negative pole of the first voltage-stabilizing diode (ZD1).

7. The ultrasonic generating and controlling circuit system according to claim 1, characterized in that: In the self-boosting ultrasonic generating circuit, the secondary winding output end (pin 5) of the first high-frequency transformer (T1) is connected to one end of the primary winding inductor (L5) of the second high-frequency transformer (T2), and the other end of the primary winding inductor (L5) of the second high-frequency transformer (T2) is connected in series with the first capacitor (C1) and then connected to the secondary output end (pin 4) of the first high-frequency transformer (T1); the secondary output end (pin 5) of the first high-frequency transformer (T1) is connected in series to one end of the primary preset adjustable multi-winding inductor (L1) of the third high-frequency transformer (T3), and the other end of the primary preset adjustable multi-winding inductor (L1) of the third high-frequency transformer (T3) is connected in series with the ultrasonic transducer or device (X) and then connected to the secondary output end (pin 4) of the first high-frequency transformer T1.

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