Ultrasonic conductivity circuit

Abstract

The utility model discloses an ultrasonic conductivity circuit which comprises a master control IC, a signal modulator, a signal amplification module, a signal filtering module, a signal output switch, a signal processing module, a mutual inductor, an electrode short circuit detection module, a control signal conversion module, an ultrasonic generator and an ultrasonic power supply. An output signal of the master control IC passes through the signal modulator, the signal amplification module, the signal filtering module and the signal output switch in sequence and then reaches a load, and a signal output by the signal output switch returns to the master control IC through the mutual inductor and the signal processing module. And the electrode short circuit condition is detected in real time, and the circuit is effectively protected when the short circuit condition is encountered, so that the service time of equipment is prolonged, and the safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ultrasonic waves, in particular to an ultrasonic conduction circuit. Background Art

[0002] The ultrasonic conductance pulse therapeutic device comprises a housing part and a circuit part, wherein the existing ultrasonic conductance circuit has a relatively single function and cannot provide effective protection for the circuit. Summary of the invention

[0003] The purpose of the utility model is to provide an ultrasonic conductance circuit to solve the problems raised in the above background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] An ultrasonic conductance circuit comprises a main control IC, a signal modulator, a signal amplification module, a signal filtering module, a signal output switch, a signal processing module, a mutual inductor, an electrode short circuit detection module, a control signal conversion module, an ultrasonic generator and an ultrasonic power supply. The output signal of the main control IC passes through the signal modulator, the signal amplification module, the signal filtering module and the signal output switch in sequence and then reaches a load. The signal output by the signal output switch also passes through the mutual inductor and the signal processing module and returns to the main control IC. The electrode short circuit detection module collects the signal output by the signal output switch and transmits it to the main control IC. The main control IC is also connected to the ultrasonic generator and the ultrasonic power supply respectively through the control signal conversion module. The ultrasonic generator is provided with electric energy by the ultrasonic power supply and is connected to the load.

[0006] As a further technical solution of the present invention: the main control IC is also connected to a display module for displaying information.

[0007] As a further technical solution of the present invention: the main control IC is also connected to a key module for operation.

[0008] As a further technical solution of the present invention: the ultrasonic generator includes an inverter U2, a transistor VT3, a transistor VT4, a transistor VT15, a transistor VT25, a transistor VT26 and a transistor VT27, the 4th pin of the inverter U2 is connected to the base of the transistor VT15 through a resistor R5, the 10th pin of the inverter U2 is connected to the base of the transistor VT4 through a resistor R2, the collector of the transistor VT4 is connected to the resistor R1 connected to the base of the transistor VT3, the collector of the transistor VT3 is connected to the collector of the transistor VT25, the capacitor C53 and the collector of the transistor VT27, the emitter of the transistor VT15 is connected to the inductor L2 and the capacitor C38 through the resistor R3, the other end of the inductor L2 is connected to the positive electrode of the diode D12, the negative electrode of the diode D12 is connected to the capacitor C9, the capacitor C39 and the resistor R4, the other end of the resistor R4 is connected to the capacitor C37 and The base of transistor VT25, the emitter of transistor VT25 is connected to capacitor L3, the other end of capacitor L3 is connected to the other end of capacitor C17, the other end of capacitor C39 and inductor L4, the other end of inductor L4 is connected to the other end of capacitor C37, the other end of capacitor C38 and ground, the emitter of transistor VT26 is connected to inductor L5 and capacitor C65 through resistor R23, the other end of inductor L5 is connected to the positive electrode of diode D13, the negative electrode of diode D13 is connected to capacitor C66, capacitor C41 and resistor R69, the other end of resistor R69 is connected to capacitor C54 and the base of transistor VT27, the emitter of transistor VT27 is connected to capacitor L6, the other end of capacitor L6 is connected to the other end of capacitor C66, the other end of capacitor C53 and inductor L7, the other end of inductor L7 is connected to the other end of capacitor C65, the other end of capacitor C53 and ground.

[0009] As a further technical solution of the present invention: the electrode short circuit detection module includes a differential amplifier U13, a Schmitt trigger U12, a resistor R59, a resistor R60, an inductor L18 and a diode D22, one end of the resistor R59 is connected to the resistor R65 and the pin 2 of the differential amplifier U13, the other end of the resistor R65 is connected to the resistor R66, the pin 4 of the differential amplifier U13 and the ground, the other end of the resistor R66 is connected to the resistor R60 and the pin 3 of the differential amplifier U13, the pin 1 of the differential amplifier U13 is connected to the inductor L18, the other end of the inductor L18 is connected to the capacitor C48 and the pin 1 of the Schmitt trigger U12, the other end of the capacitor C48 is connected to the capacitor C52 and the ground, the other end of the capacitor C52 is connected to the capacitor C50, the resistor R55 and the pin 8 of the differential amplifier U13, the other end of the resistor R55 is connected to the other end of the capacitor C50 and the anode of the diode D22, and the cathode of the diode D22 is connected to the capacitor C49 and the pin 2 of the Schmitt trigger U12.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] The ultrasonic conductance circuit in the utility model can judge whether the electrode is open circuited and detect the electrode short circuit situation in real time, and effectively protect the circuit when a short circuit situation occurs, thereby extending the use time of the equipment and increasing safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural diagram of a mechanical keyboard positioning plate with light according to the utility model.

[0013] Figure 2 This is the circuit diagram of the ultrasonic part.

[0014] Figure 3 This is the circuit diagram for the electrical stimulation signal conversion and amplification part.

[0015] Figure 4 This is the circuit diagram of the electrode short circuit detection part.

[0016] Figure 5 This is the circuit diagram of the electrode open circuit detection part. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1-5 , an ultrasonic conductance circuit, comprising a main control IC, a signal modulator, a signal amplification module, a signal filtering module, a signal output switch, a signal processing module, a mutual inductor, an electrode short circuit detection module, a control signal conversion module, an ultrasonic generator and an ultrasonic power supply, characterized in that the output signal of the main control IC passes through the signal modulator, the signal amplification module, the signal filtering module, and the signal output switch in sequence to the load, the signal output by the signal output switch also passes through the mutual inductor and the signal processing module back to the main control IC, the electrode short circuit detection module collects the signal output by the signal output switch and transmits it to the main control IC, the main control IC is also connected to the ultrasonic generator and the ultrasonic power supply respectively through the control signal conversion module, the ultrasonic generator is provided with power by the ultrasonic power supply and is connected to the load.

[0019] The main control IC generates a 2KHz frequency square wave pulse, which is modulated into a diamond-shaped symmetrical AC signal by the signal modulator. The signal is then amplified in voltage and power by the signal amplifier module, and then filtered out by the signal filter module for frequency signals greater than 20KHz, and then output to the load through the signal output switch.

[0020] When there are normal signals at both ends of the load, the transformer converts the AC signal flowing through the load into a DC signal. After signal processing, the DC signal is converted into a pulse that matches the AC signal modulation and fed back to the main control IC to determine whether the electrode is open.

[0021] The electrode short circuit detection module monitors the signals at both ends of the load in real time. When a short circuit occurs between the two electrodes, the current will change greatly. After being detected, it will be fed back to the main control IC through internal signal processing. It will immediately send a signal through the signal output switch and cut off the switch to stop the output. At the same time, when it returns to normal and maintains for a certain period of time, it will automatically resume output. It plays a role in protecting the circuit.

[0022] The main control IC generates PWM waves and converts them into control signals to generate two identical control signals, which simultaneously control the ultrasonic power supply and the ultrasonic generator, driving the transducer inside the electrode to emit ultrasonic waves and act on the load.

[0023] Here’s how it works:

[0024] like Figure 2 As shown, the ultrasound part:

[0025] When the start button is pressed and the intensity value is adjusted, the "U2" inverter receives the pulse control signal (CHAO_PWM) from the main control chip and inverts the signal twice and divides it into three parts for synchronous control. The first part is output by pin "5Y", and controls the on and off of transistor VT4 through resistor R2, and then controls transistor VT3 through resistor R1. The on and off of VT3 controls the 12-volt power supply to synchronously supply power to ultrasonic oscillator tubes VT25 and VT27 in a pulsed manner. The second part is output by pin "2Y", and controls transistor VT15 through resistor R5, thereby controlling the on and off of the 5-volt power supply. The resistor R3 behind the transistor is a current limiting resistor, and its value can adjust the overall output power of the ultrasonic wave. Capacitor C38 is a filter capacitor. First, it can filter the high-frequency interference from the front power supply, and second, it can prevent the high-frequency signal after the rear oscillation circuit starts to reversely affect the power supply. The function of inductor L2 is to further prevent the high-frequency signal of the oscillation circuit from affecting the power supply in reverse after the oscillation. Diode D12 protects the oscillation tube to prevent the oscillation tube from being damaged due to the reverse connection of the power supply in front. Resistor R4 and capacitor C37 form an RC filter circuit to select the frequency and filter out the frequency above about 500K in the stray wave. Capacitor C39, C17, inductor L3, L4, transistor and CON2 (connected to the transducer) together form a three-point starting capacitor. When the power is turned on, it will generate oscillation after receiving the excitation signal of 2Y, and the transducer will convert the electrical signal into an acoustic signal and transmit it out.

[0026] Note: The third part has the same principle as the second part, which is synchronous control.

[0027] like Figure 3As shown, the electrical stimulation signal conversion and amplification part:

[0028] When the start button is pressed and the intensity value is adjusted, the main control chip sends the modulated digital signal to the "U9" digital-analog chip via the data line (D0-D7) and the control line (DAC_CTR), which is converted into a pulsating voltage signal output (OUTA) by the first-stage operational amplifier of U10 (dual operational amplifier), and then finally obtained by the second-stage operational amplifier (adder) to obtain an alternating positive and negative AC signal with a value between positive and negative 3.5V. The capacitor C31 in the backward circuit is a coupling capacitor, which is used to filter out the DC component in the front signal. The resistor R27 is a pull-down resistor to ensure that it is always grounded when there is no signal. The coupled AC signal passes through the differential circuit composed of VT10 and VT9 to suppress temperature drift (to prevent the output amplitude value from changing due to the temperature increase of the transistor working for a long time). The power supply of the differential circuit is composed of R32, LED2, R34 and VT11 to provide a stable current, and finally output at the third foot of the transistor. After the small-amplitude AC signal is converted into a large-amplitude AC signal by the transistor VT8, it is amplified by VT7 and VT13, and finally coupled with the rear circuit after the DC component is filtered out by capacitor C32. Among them, the working power supply of VT8 is provided by the current source composed of R33, LED3, R35, and VT12. C63 is a filter capacitor used to filter out interference signals above the working frequency. Capacitor C25 is a power filter, and resistors R25 and R28 are load matching resistors. The signal coupled by capacitor C32 passes through resistor R73 and enters the 5th foot of the relay with the LC filter (L9, C16). At the same time, another output (with exactly the same waveform but opposite phase (U11 is an inverter)) enters the 4th foot of the relay. The common output of the two acts on both ends of the load through ZJ1 (common mode inductor). Since the two waveforms are exactly the same (just opposite in phase, that is, when one is positive, the other is negative), the voltage at the two ends of the load is the superposition of the two.

[0029] Note: Since the operating frequency of this circuit is relatively low and it is on the same circuit board as the ultrasonic circuit, it will be interfered by high-frequency ultrasound when working. Therefore, the filters in the circuit can filter out the ultrasonic signal. Finally, capacitors C69 and C70 are used to filter out the ultrasound radiated from space to prevent it from entering the front circuit. The relay is the final output control to ensure that there is no voltage at both ends of the load when the machine is not in operation.

[0030] like Figure 4 As shown, electrode short circuit detection:

[0031] When the load has a signal, the circuit starts to detect, and the signals at both ends of the load are divided by R59, R65, R60, and R66 and sent to the "U13" differential amplifier for signal processing. After filtering through LC (L18, C48), the waveform conversion circuit composed of U12 Schmitt trigger and C50, R55, and D22 converts the dense modulation waveform into a pulse wave of the modulation frequency (that is, a waveform that can be recognized by the main control chip), and finally sends it to the main control chip. When there is a normal shape at both ends of the load, the pulse wave is always collected. When the electrode is short-circuited, the collected signal is always a high level, so that the output relay can be controlled to disconnect and stop output, which is used to protect the internal circuit and prevent circuit damage caused by long-term short circuit. At the same time, when it returns to normal after a short-term short circuit, it is collected by the main control chip and the relay is turned on to continue output.

[0032] like Figure 5 As shown, electrode open circuit detection:

[0033] When the mutual inductor in the circuit collects the signals at both ends of the load, it converts the AC signal into a DC pulsating signal and sends it to the relay. The capacitor C68 is charged and discharged through the resistor R77 or R78 to convert the waveform, and then filtered by the first-order low-pass filter composed of the resistor R75 and the capacitor C72. The signal amplitude after filtering is low, and it is sent to the amplifier composed of the operational amplifier for amplitude amplification and then sent to the main control chip. The main control chip determines whether the electrode is open according to the high and low levels and prompts. R80 and R81 or R82 in the circuit adjust the amplification factor of the operational amplifier according to the output gear, and the voltage regulator D17 is used for clamping to ensure that the amplitude of the collected signal will not exceed 5V at any time, thereby protecting the chip in the subsequent circuit.

[0034] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0035] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An ultrasonic conduction circuit, comprising a main control IC, a signal modulator, a signal amplification module, a signal filtering module, a signal output switch, a signal processing module, a mutual inductor, an electrode short circuit detection module, a control signal conversion module, an ultrasonic generator and an ultrasonic power supply, characterized in that: The output signal of the main control IC passes through the signal modulator, signal amplification module, signal filtering module, and signal output switch in sequence to the load. The signal output by the signal output switch also passes through the mutual inductor and the signal processing module and returns to the main control IC. The electrode short circuit detection module collects the signal output by the signal output switch and transmits it to the main control IC. The main control IC is also connected to the ultrasonic generator and the ultrasonic power supply respectively through the control signal conversion module. The ultrasonic generator is provided with power by the ultrasonic power supply and is connected to the load.

2. The ultrasonic conductive circuit according to claim 1, characterized in that: The main control IC is also connected to a display module for displaying information.

3. The ultrasonic conductive circuit according to claim 2, characterized in that: The main control IC is also connected to a key module for operation.

4. The ultrasonic conductive circuit according to claim 2, characterized in that: The ultrasonic generator comprises an inverter U2, a transistor VT3, a transistor VT4, a transistor VT15, a transistor VT25, a transistor VT26 and a transistor VT27, wherein the 4th pin of the inverter U2 is connected to the base of the transistor VT15 through a resistor R5, the 10th pin of the inverter U2 is connected to the base of the transistor VT4 through a resistor R2, the collector of the transistor VT4 is connected to the resistor R1 connected to the base of the transistor VT3, the collector of the transistor VT3 is connected to the collector of the transistor VT25, the capacitor C53 and the collector of the transistor VT27, the emitter of the transistor VT15 is connected to the inductor L2 and the capacitor C38 through the resistor R3, the other end of the inductor L2 is connected to the positive electrode of the diode D12, the negative electrode of the diode D12 is connected to the capacitor C9, the capacitor C39 and the resistor R4, and the other end of the resistor R4 is connected to the capacitor C37 and the transistor VT25 The base of transistor VT26 is connected to the emitter of transistor VT25, the other end of capacitor L3 is connected to the other end of capacitor C17, the other end of capacitor C39 and inductor L4, the other end of inductor L4 is connected to the other end of capacitor C37, the other end of capacitor C38 and ground, the emitter of transistor VT26 is connected to inductor L5 and capacitor C65 through resistor R23, the other end of inductor L5 is connected to the positive electrode of diode D13, the negative electrode of diode D13 is connected to capacitor C66, capacitor C41 and resistor R69, the other end of resistor R69 is connected to capacitor C54 and the base of transistor VT27, the emitter of transistor VT27 is connected to capacitor L6, the other end of capacitor L6 is connected to the other end of capacitor C66, the other end of capacitor C53 and inductor L7, the other end of inductor L7 is connected to the other end of capacitor C65, the other end of capacitor C53 and ground.

5. The ultrasonic conductive circuit according to claim 2, characterized in that: The electrode short circuit detection module includes a differential amplifier U13, a Schmitt trigger U12, a resistor R59, a resistor R60, an inductor L18 and a diode D22, one end of the resistor R59 is connected to the resistor R65 and the pin 2 of the differential amplifier U13, the other end of the resistor R65 is connected to the resistor R66, the pin 4 of the differential amplifier U13 and the ground, the other end of the resistor R66 is connected to the resistor R60 and the pin 3 of the differential amplifier U13, the pin 1 of the differential amplifier U13 is connected to the inductor L18, the other end of the inductor L18 is connected to the capacitor C48 and the pin 1 of the Schmitt trigger U12, the other end of the capacitor C48 is connected to the capacitor C52 and the ground, the other end of the capacitor C52 is connected to the capacitor C50, the resistor R55 and the pin 8 of the differential amplifier U13, the other end of the resistor R55 is connected to the other end of the capacitor C50 and the anode of the diode D22, and the cathode of the diode D22 is connected to the capacitor C49 and the pin 2 of the Schmitt trigger U12.

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