Stable booster circuit of ultrasonic liquid level sensor

Abstract

The utility model discloses a stable boost circuit of an ultrasonic liquid level sensor, which comprises a power supply, a boost transformer, a filter circuit, a drive circuit, an overcurrent and overvoltage linkage protection circuit and a feedback regulation circuit, the drive circuit is electrically connected with the filter circuit and the overcurrent and overvoltage linkage protection circuit, and the feedback regulation circuit is electrically connected with the overcurrent and overvoltage linkage protection circuit; according to the utility model, the overcurrent and overvoltage linkage protection circuit is combined with the feedback regulation circuit, so that effective monitoring and regulation of current and voltage in the driving circuit and overcurrent and overvoltage linkage protection can be realized, and through linkage protection, the situation that damage is aggravated by another factor when the circuit is abnormal due to a certain factor can be effectively reduced, and the service life of the driving circuit is prolonged. Therefore, the reliability and the safety of the stable boost circuit are improved.

Description

Technical Field

[0001] This utility model relates to the field of ultrasonic liquid level sensor technology, and in particular to a stable boost circuit for an ultrasonic liquid level sensor. Background Technology

[0002] An ultrasonic level sensor is a non-contact liquid level measurement device that measures liquid level by sending ultrasonic pulses and receiving their reflected signals. The stabilizing boost circuit of the ultrasonic level sensor is mainly used to provide a stable high voltage to drive the ultrasonic transducer. In the prior art, although some circuits of the stabilizing boost circuit of the ultrasonic level sensor have overvoltage and overcurrent protection, they are monitored and controlled separately. The protection effect is not ideal, and there is a lack of an effective and accurate overcurrent and overvoltage linkage protection mechanism. There is a risk that when one factor causes the circuit to malfunction, another factor will exacerbate the damage, which may result in damage to electronic components or the ultrasonic transducer. Therefore, this application proposes a stabilizing boost circuit for an ultrasonic level sensor. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a stable boost circuit for an ultrasonic liquid level sensor.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A stable boost circuit for an ultrasonic liquid level sensor includes a power supply, a boost transformer, a filter circuit, a drive circuit, an overcurrent and overvoltage linkage protection circuit, and a feedback adjustment circuit. The boost transformer is electrically connected to the power supply and the filter circuit, the drive circuit is electrically connected to the filter circuit and the overcurrent and overvoltage linkage protection circuit, and the feedback adjustment circuit is electrically connected to the overcurrent and overvoltage linkage protection circuit.

[0006] Preferably, the power supply provides basic power to the entire circuit and boosts the voltage of the input power supply to the required operating voltage through a step-up transformer.

[0007] Preferably, the filter circuit consists of a capacitor and an inductor, used to smooth the pulsating current output by the step-up transformer and convert it into a stable DC voltage. The drive circuit is used to receive the stable power supply provided by the filter circuit and convert the power supply into a signal or current suitable for controlling the load.

[0008] Preferably, the overcurrent and overvoltage linkage protection circuit is used to protect the drive circuit. The overcurrent and overvoltage linkage protection circuit includes comparator U1 and comparator U2. The non-inverting input terminal 1 and the inverting input terminal 2 of comparator U1 are electrically connected to one end of resistor R3 and one end of resistor R2, respectively. The other end of resistor R2 and the other end of resistor R3 are electrically connected to one end of resistor R4. The other end of resistor R4 is electrically connected to one end of inductor F2. The other end of inductor F2 is electrically connected to the base of transistor Q1. The collector of transistor Q1 is electrically connected to the anode of diode D1. The cathode of diode D1 is electrically connected to the output terminal 3 of comparator U1. The emitter of transistor Q1 is electrically connected to the power supply pin 4 of comparator U1. The output terminal 3 of comparator U1 is electrically connected to one end of resistor R1. The other end of resistor R1... The output terminal 3 of comparator U2 is electrically connected to one end of capacitor C1. The other end of capacitor C1 is electrically connected to one end of resistor R7, the negative terminal of diode D2, and one end of capacitor C2. The non-inverting input terminal 1 and the inverting input terminal 2 of comparator U2 are electrically connected to one end of resistor R6 and one end of resistor R5, respectively. The other end of resistor R7 is electrically connected to one end of indicator light L. The other end of indicator light L is electrically connected to one end of switch S1. The other end of switch S1 is electrically connected to one end of resistor R8. The other end of resistor R8 is grounded. The other ends of resistor R5, resistor R6, diode D2, capacitor C2, switch S1, resistor R8, and inductor F2 are all electrically connected to the output voltage of the drive circuit.

[0009] Preferably, the feedback adjustment circuit includes comparator U3 and comparator U4. The non-inverting input terminal 2 of comparator U3 is electrically connected to the output terminal 3 of comparator U4. The inverting input terminal 1 of comparator U3 is electrically connected to one end of inductor F1 and the base of transistor Q3. The collector of transistor Q3 is grounded, and the emitter of transistor Q3 is electrically connected to the output terminal 3 of comparator U3. The inverting input terminal 1 of comparator U4 is electrically connected to one end of resistor R13. The other end of resistor R13 is electrically connected to the output terminal 3 of comparator U3 and the emitter of transistor Q3. The inverting input terminal 1 of comparator U3 and the output terminal 3 of comparator U4 are electrically connected to one end of resistor R9, one end of capacitor C3, and one end of resistor R10. One end of the transistor is connected to the emitter of transistor Q4 and the emitter of transistor Q2. The collector of transistor Q2 and the other end of resistor R10 are all grounded. The base of transistor Q4 and the base of transistor Q2 are electrically connected. The non-inverting input 2 of comparator U4 is electrically connected to one end of resistor R11, one end of resistor R12 and one end of capacitor C4. The other end of capacitor C4 is grounded. The other ends of resistor R11, resistor R12, resistor R13 and the output 3 of comparator U3 are all electrically connected to the input of the drive circuit. The other ends of inductor F1, resistor R9, capacitor C3 and the collector of transistor Q4 are all electrically connected to one end of indicator light L and the other end of resistor R7.

[0010] Preferably, resistors R2 and R3 are both shunt resistors, resistors R5 and R6 are both voltage divider resistors, and comparators U1 and U2 are both LM393.

[0011] Preferably, transistors Q4 and Q2 and resistor R10 constitute a PWM controller, which is used to change the average voltage or current of the output.

[0012] Compared with existing technologies, the beneficial effects of this utility model are:

[0013] This invention combines an overcurrent and overvoltage linkage protection circuit with a feedback regulation circuit to achieve effective monitoring and adjustment of the current and voltage in the drive circuit, as well as overcurrent and overvoltage linkage protection. Through linkage protection, it can effectively reduce the damage caused by another factor when one factor causes circuit malfunction, thereby improving the reliability and safety of the stable boost circuit. Attached Figure Description

[0014] Figure 1 This is a block diagram of a stable boost circuit for an ultrasonic liquid level sensor proposed in this utility model.

[0015] Figure 2 The circuit diagram of the overcurrent and overvoltage linkage protection circuit in the stable boost circuit of the ultrasonic liquid level sensor proposed in this utility model;

[0016] Figure 3 This is a circuit diagram of the feedback adjustment circuit in the stable boost circuit of an ultrasonic liquid level sensor proposed in this utility model. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0018] Reference Figure 1-3 A stable boost circuit for an ultrasonic liquid level sensor includes a power supply, a boost transformer, a filter circuit, a drive circuit, an overcurrent and overvoltage linkage protection circuit, and a feedback regulation circuit. The power supply provides basic power to the entire circuit and boosts the voltage of the input power supply to the required operating voltage through the boost transformer.

[0019] The step-up transformer is electrically connected to the power supply and the filter circuit. The filter circuit consists of capacitors and inductors and is used to smooth the pulsating current output by the step-up transformer and convert it into a stable DC voltage. The drive circuit is used to receive the stable power supply provided by the filter circuit and convert the power supply into a signal or current suitable for controlling the load.

[0020] The drive circuit is electrically connected to the filter circuit and the overcurrent and overvoltage linkage protection circuit, and the feedback regulation circuit is electrically connected to the overcurrent and overvoltage linkage protection circuit.

[0021] The overcurrent and overvoltage protection circuit is used to protect the drive circuit. This circuit includes comparators U1 and U2. The non-inverting input 1 and inverting input 2 of comparator U1 are electrically connected to one end of resistor R3 and one end of resistor R2, respectively. The other ends of resistors R2 and R3 are electrically connected to one end of resistor R4. The other end of resistor R4 is electrically connected to one end of inductor F2. The other end of inductor F2 is electrically connected to the base of transistor Q1. The collector of transistor Q1 is electrically connected to the anode of diode D1. The cathode of diode D1 is electrically connected to the output 3 of comparator U1. The emitter of transistor Q1 is electrically connected to the power supply pin 4 of comparator U1. The output 3 of comparator U1 is electrically connected to one end of resistor R1. The other end of resistor R1 is electrically connected to the output 3 of comparator U2. The output 3 of comparator U2 is electrically connected to... One end of capacitor C1 is electrically connected to one end of resistor R7, the negative terminal of diode D2, and one end of capacitor C2. The non-inverting input terminal 1 and the inverting input terminal 2 of comparator U2 are electrically connected to one end of resistor R6 and one end of resistor R5, respectively. The other end of resistor R7 is electrically connected to one end of indicator light L. The other end of indicator light L is electrically connected to one end of switch S1. The other end of switch S1 is electrically connected to one end of resistor R8. The other end of resistor R8 is grounded. The other ends of resistor R5, resistor R6, diode D2, capacitor C2, switch S1, resistor R8, and inductor F2 are all electrically connected to the output voltage of the drive circuit. Among them, resistors R2 and R3 are shunt resistors, and resistors R5 and R6 are voltage divider resistors. Comparator U1 and comparator U2 are both LM393.

[0022] The feedback adjustment circuit includes comparators U3 and U4. The non-inverting input 2 of comparator U3 is electrically connected to the output 3 of comparator U4. The inverting input 1 of comparator U3 is electrically connected to one end of inductor F1 and the base of transistor Q3. The collector of transistor Q3 is grounded, and the emitter of transistor Q3 is electrically connected to the output 3 of comparator U3. The inverting input 1 of comparator U4 is electrically connected to one end of resistor R13, and the other end of resistor R13 is connected to the comparator... The output terminal 3 of comparator U3 is electrically connected to the emitter of transistor Q3. The inverting input terminal 1 of comparator U3 and the output terminal 3 of comparator U4 are electrically connected to one end of resistor R9, one end of capacitor C3, one end of resistor R10, the emitter of transistor Q4, and the emitter of transistor Q2. The collector of transistor Q2 and the other end of resistor R10 are both grounded. The base of transistor Q4 and the base of transistor Q2 are electrically connected. The non-inverting input terminal 2 of comparator U4 is electrically connected to... One end of resistor R11, one end of resistor R12, and one end of capacitor C4 are connected. The other end of capacitor C4 is grounded. The other ends of resistors R11, R12, and R13, as well as the output terminal 3 of comparator U3, are electrically connected to the input terminal of the drive circuit. The other ends of inductor F1, resistor R9, capacitor C3, and the collector of transistor Q4 are electrically connected to one end of indicator light L and the other end of resistor R7. Transistors Q4 and Q2, along with resistor R10, constitute a PWM controller, which is used to change the average voltage or current of the output. This invention combines overcurrent and overvoltage linkage protection circuits with feedback regulation circuits to achieve effective monitoring and adjustment of current and voltage in the drive circuit, as well as overcurrent and overvoltage linkage protection. Through linkage protection, it can effectively reduce the damage caused by another factor when one factor causes circuit malfunction, thereby improving the reliability and safety of the stable boost circuit.

[0023] Working principle: During use, the step-up transformer boosts the power supply voltage and filters it through the filter circuit before providing a stable power supply to the drive circuit. The drive circuit converts the voltage into a signal format suitable for the ultrasonic liquid level sensor. Simultaneously, the current and voltage in the drive circuit are input to the overcurrent and overvoltage linkage protection circuit. Resistors R2 and R3 shunt the input current, and the shunt current is compared by comparator U1. At the same time, resistors R5 and R6 divide the input voltage and compare it by comparator U2. When the current or voltage is detected to be within the normal range, comparators U1 and U2 output a high level, transistor Q1 conducts, and the load works normally. When the current or voltage exceeds the set safety range, transistor Q1 disconnects and triggers an overvoltage alarm. At the same time, switch S1 conducts, and indicator light L lights up to remind personnel. By simultaneously monitoring and controlling the current and voltage, the purpose of overcurrent and overvoltage linkage protection is achieved, improving the reliability and safety of the stable boost circuit.

[0024] Meanwhile, the output current and voltage within the normal range enter the feedback regulation circuit. The input signal is compared with the standard voltage by comparators U3 and U4, and the average output voltage or current is changed by the PWM controller composed of transistors Q4 and Q2 and resistor R10, thereby ensuring the stability of the output voltage and current.

[0025] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A stable boost circuit for an ultrasonic liquid level sensor, characterized by, The power supply, the step-up transformer, the filter circuit, the drive circuit, the overcurrent and overvoltage linkage protection circuit and the feedback regulation circuit are electrically connected.

2. The stable boost circuit for an ultrasonic liquid level sensor according to claim 1, wherein The power supply provides basic power for the entire circuit and raises the voltage of the input power supply to the required working voltage through the step-up transformer.

3. The stable boost circuit for an ultrasonic liquid level sensor according to claim 1, wherein The filter circuit is composed of a capacitor and an inductor, which is used to smooth the pulsating current output by the step-up transformer and convert it into stable DC voltage.

4. The stable boost circuit for an ultrasonic liquid level sensor according to claim 1, wherein The overcurrent and overvoltage linkage protection circuit is used to protect the drive circuit, and the overcurrent and overvoltage linkage protection circuit includes a comparator U1 and a comparator U2, the same phase input end 1 and the opposite phase input end 2 of the comparator U1 are electrically connected with one end of the resistor R3 and one end of the resistor R2 respectively, the other end of the resistor R2 and the other end of the resistor R3 are electrically connected with one end of the resistor R4, the other end of the resistor R4 is electrically connected with one end of the inductor F2, the other end of the inductor F2 is electrically connected with the base of the transistor Q1, the collector of the transistor Q1 is electrically connected with the anode of the diode D1, the cathode of the diode D1 is electrically connected with the output end 3 of the comparator U1, the emitter of the transistor Q1 is electrically connected with the power supply pin 4 of the comparator U1, one end of the resistor R1 is electrically connected with the output end 3 of the comparator U1, the other end of the resistor R1 is electrically connected with the output end 3 of the comparator U2, one end of the capacitor C1 is electrically connected with the output end 3 of the comparator U2, the other end of the capacitor C1 is electrically connected with one end of the resistor R7, the cathode of the diode D2 and one end of the capacitor C2, one end of the resistor R6 and one end of the resistor R5 are respectively electrically connected with the same phase input end 1 and the opposite phase input end 2 of the comparator U2, one end of the resistor R7 is electrically connected with one end of the indicator lamp L, the other end of the indicator lamp L is electrically connected with one end of the switch S1, one end of the resistor R8 is electrically connected with the other end of the switch S1, the other end of the resistor R8 is grounded, the other end of the resistor R5, the other end of the resistor R6, the anode of the diode D2, the other end of the capacitor C2, the other end of the switch S1, one end of the resistor R8 and one end of the inductor F2 are electrically connected with the output voltage of the drive circuit.

5. The regulated boost circuit for an ultrasonic liquid level sensor of claim 4, wherein, The feedback adjusting circuit comprises comparators U3 and U4, the non-inverting input end 2 of the comparator U3 is electrically connected with the output end 3 of the comparator U4, the inverting input end 1 of the comparator U3 is electrically connected with one end of an inductor F1 and the base of a transistor Q3, the collector of the transistor Q3 is grounded, the emitter of the transistor Q3 is electrically connected with the output end 3 of the comparator U3, one end of a resistor R13 is electrically connected with the inverting input end 1 of the comparator U4, the other end of the resistor R13 is electrically connected with the output end 3 of the comparator U3 and the emitter of the transistor Q3, one end of a resistor R9, one end of a capacitor C3, one end of a resistor R10, the emitter of a transistor Q4 and the emitter of a transistor Q2 are electrically connected with the inverting input end 1 of the comparator U3 and the output end 3 of the comparator U4, the collector of the transistor Q2 and the other end of the resistor R10 are grounded, the base of the transistor Q4 and the base of the transistor Q2 are electrically connected, one end of a resistor R11, one end of a resistor R12 and one end of a capacitor C4 are electrically connected with the non-inverting input end 2 of the comparator U4, the other end of the capacitor C4 is grounded, the other end of the resistor R11, the other end of the resistor R12, the other end of the resistor R13 and the output end 3 of the comparator U3 are electrically connected with the input end of a driving circuit, the other end of the inductor F1, the other end of the resistor R9, the other end of the capacitor C3 and the collector of the transistor Q4 are electrically connected with one end of an indicator lamp L and the other end of a resistor R7.

6. The regulated boost circuit for an ultrasonic liquid level sensor of claim 4, wherein, The resistor R2 and the resistor R3 are shunt resistors, the resistor R5 and the resistor R6 are voltage dividing resistors, and the models of the comparators U1 and U2 are both LM393.

7. The regulated boost circuit for an ultrasonic liquid level sensor of claim 5, wherein, The transistor Q4, the transistor Q2 and the resistor R10 constitute a PWM controller, and the PWM controller is used for changing the average voltage or current of the output.

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