Voltage detection circuit based on MAX976EUA

Abstract

The utility model relates to a voltage detection circuit based on MAX976EUA, which comprises a double-channel analog comparator, four comparison circuits are designed in total, the comparator adopts MAX976EUA, and the voltages of the anti-phase ends of the four comparison circuits are emission voltages and are detection voltages VIN obtained after voltage division by a plurality of resistors; the first-path analog comparator is used for carrying out voltage division on a 5V power supply voltage power supply through a plurality of resistors, simultaneously obtaining an applied reference voltage VR1 which is equal to 1V at a normal phase input end, and then comparing VIN with VR1 to obtain an output level signal I of HV-check1; and the second analog comparator obtains a reference voltage VR2 = 2V through voltage division of a plurality of resistors, and then compares VIN with VR1 to obtain an output level signal II of the HV-check1. According to the voltage detection circuit provided by the utility model, whether the emission high voltage is increased to or reduced to the required voltage value can be conveniently judged.

Description

Technical Field

[0001] This utility model relates to the field of voltage detection technology for sonar circuits, and in particular to a voltage detection circuit based on MAX976EUA. Background Technology

[0002] In sonar transmitters, high transmission voltages are often required according to overall technical requirements. After the wet end is submerged, the dry end cannot determine whether the actual transmission voltage applied in the circuit is correct. If a false trigger occurs when the transmission voltage is high, issuing incorrect commands can easily cause the transmitting transistor to break down instantly, increasing the risk of equipment damage.

[0003] Therefore, a solution needs to be designed to add a voltage detection circuit to the transmitting circuit to determine whether the transmitting high voltage has been increased or decreased to the required voltage value. Summary of the Invention

[0004] This invention primarily addresses the issue in sonar transmission circuits where the actual applied transmission voltage cannot be determined, leading to accidental operation and subsequent circuit malfunction, including damage to the preceding circuitry, when the transmission voltage is too high. The invention provides a solution that divides the high-voltage transmission into two levels for detection, using a simple dual-channel analog comparator to determine the actual voltage level for further processing.

[0005] To solve the above technical problems, this utility model provides a voltage detection circuit based on MAX976EUA. The voltage detection circuit divides the transmitted high voltage into two levels for detection and includes a dual-channel analog comparator, with a total of four comparator circuits. The comparator uses MAX976EUA, and the voltage at the inverting input of the four comparator circuits is the transmitted voltage, which is the detection voltage VIN obtained after voltage division by several resistors. The power supply voltage of the comparator is set to 5V.

[0006] The first analog comparator divides the 5V power supply voltage using several resistors, and simultaneously applies a reference voltage VR1=1V to the non-inverting input. Then, it compares VIN with VR1 to obtain the output level signal I of HV-check1.

[0007] The second analog comparator obtains a reference voltage VR2=2V by dividing the voltage with several resistors, and then compares VIN with VR1 to obtain the output level signal Ⅱ of HV-check1.

[0008] In one embodiment of this utility model, the voltage division of several resistors at the inverting terminal is obtained by setting R2:(R1+R2)=1:33 to obtain VIN.

[0009] In one embodiment of this utility model, the non-inverting input terminal of the first analog comparator is provided with a series resistor R7 and a parallel resistor R3, which are used to divide the voltage to obtain VR1.

[0010] In one embodiment of this utility model, the non-inverting input terminal of the second analog comparator is provided with a series resistor R8 and a parallel resistor R4, which are used to divide the voltage to obtain VR2.

[0011] In one embodiment of this utility model, a third analog comparator is provided, which divides the 5V power supply voltage by using a series resistor R9 and a parallel resistor R5, and obtains a reference voltage VR3=3V applied at the non-inverting input terminal. Then, VIN is compared with VR3 to obtain the output level signal 3 of HV-check1.

[0012] In one embodiment of this utility model, a fourth analog comparator is provided, which divides the 5V power supply voltage by using a series resistor R10 and a parallel resistor R6 to obtain a reference voltage VR4=4V applied at the non-inverting input terminal. Then, VIN is compared with VR4 to obtain the output level signal 4 of HV-check1.

[0013] Compared with the prior art, the above-mentioned technical solution of this utility model has the following advantages: In the voltage detection circuit of this utility model, a high-speed dual-channel analog comparator MAX976EUA is used to determine whether the transmission high voltage has been raised to or lowered to the required voltage value, which makes it easy to understand the transmitter status, stable and reliable, and the voltage detection circuit is low in cost, easy to implement, and has strong practicality. Attached Figure Description

[0014] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0015] Figure 1 This is a schematic diagram of the voltage detection circuit based on MAX976EUA of this utility model;

[0016] Figure 2 This is a functional block diagram of the pinout of the MAX976EUA described in this utility model;

[0017] Figure 3 This is a schematic diagram of the MAX976EUA described in this utility model. Detailed Implementation

[0018] like Figure 1As shown, this embodiment provides a voltage detection circuit based on the MAX976EUA. The voltage detection circuit divides the transmitted high voltage into two levels for detection, including a dual-channel analog comparator, with a total of four comparator circuits. The comparators use the MAX976EUA, and the voltage at the four inverting inputs is the detection voltage VIN obtained by dividing the transmitted voltage using R2:(R1+R2)=1:33. The comparator's supply voltage is set to 5V. The first channel uses resistors R3 and R7 to divide the 5V power supply, obtaining a reference voltage VR1=1V applied to the non-inverting input. Comparing VIN with VR1 yields the output level signal of HV-check1. Based on this level signal, it can be determined whether the detected voltage VIN has reached 33V. Simultaneously, it can be combined with an FPGA to upload the level signal to the dry end, allowing for rapid determination of whether the transmitted voltage has reached the 33V level even after the wet end is submerged underwater.

[0019] Similarly, the second comparator outputs a reference voltage VR2 of 2V through voltage divider R4 and R8. Based on the above operating principle, the output level signal of HV-check2 indicates whether the transmit voltage has reached the corresponding 66V level.

[0020] By designing two analog comparator circuits, MAX976EUA, and combining them with different voltage divider resistors such as R5 and R9, R6 and R10, the reference voltages VR3 and VR4 can be set to 3V and 4V, respectively, thereby determining whether the transmit voltage has reached the corresponding 99V and 132V levels.

[0021] In practical applications of sonar, the resistance value of the voltage divider resistor can be adjusted according to different performance requirements to determine different voltage values, demonstrating high flexibility.

[0022] Therefore, in the sonar transmitter, the applied transmission voltage is set to HV-output (specific requirements depend on the actual design). For ease of detection, the transmission high voltage is divided into four levels: 33V, 66V, 99V, and 132V. The voltage comparator used in the detection circuit is the high-speed rail-to-rail dual-channel analog comparator MAX976EUA. This comparator uses a single power supply, with the VCC power input being 2.7-5.5VDC, and has extremely low power consumption. Figure 2 The pin function block diagram of the MAX976EUA is shown below.

[0023] like Figure 3As shown, the reference voltage VR1 is input to the first non-inverting input (+) of the MAX976EUA and compared with the input voltage VIN1 at the inverting input (-). When the voltage at the + input is greater than the voltage at the - input, i.e., VIN1 is greater than VR1, the comparator's output signal OUT1 is high; when the voltage at the + input is less than the voltage at the - input, i.e., VIN1 is less than VR1, the comparator's output signal OUT1 is zero. The second comparator circuit of the MAX976EUA operates on the same principle. When the voltage at the + input is greater than the voltage at the - input, i.e., VIN2 is greater than VR2, the comparator's output signal OUT2 is high; when the voltage at the + input is less than the voltage at the - input, i.e., VIN2 is less than VR2, the comparator's output signal OUT2 is zero. Based on the output levels of OUT1 and OUT2, the voltage range of the input terminals VIN1 and VIN2 can be determined.

[0024] The voltage detection circuit described in this embodiment automatically adjusts the resistance value of the voltage divider resistor according to the sonar specifications of different functions, so as to determine different voltage values. At the same time, it is used to determine whether the transmission high voltage has risen to or fallen to the required voltage value, so as to understand the transmitter status.

[0025] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A voltage detection circuit based on MAX976EUA, wherein the voltage detection circuit divides the transmitted high voltage into two levels for detection, characterized in that, It includes a dual-channel analog comparator and a total of 4 comparator circuits. The comparator uses MAX976EUA, and the voltage at the inverting input of the 4 comparator circuits is the emitter voltage, which is the detection voltage VIN obtained after voltage division by several resistors. The power supply voltage of the comparator is set to 5V. The first analog comparator divides the 5V power supply voltage using several resistors, and simultaneously applies a reference voltage VR1=1V to the non-inverting input. Then, it compares VIN with VR1 to obtain the output level signal I of HV-check1. The second analog comparator obtains a reference voltage VR2=2V by dividing the voltage with several resistors, and then compares VIN with VR1 to obtain the output level signal Ⅱ of HV-check1.

2. The voltage detection circuit according to claim 1, characterized in that: The voltage division of the inverting terminals is achieved by using resistors at the inverting terminals, where R2:(R1+R2)=1:33, to obtain VIN.

3. The voltage detection circuit according to claim 1, characterized in that: The non-inverting input of the first analog comparator has a series resistor R7 and a parallel resistor R3, which are used to divide the voltage to obtain VR1.

4. The voltage detection circuit according to claim 1, characterized in that: The non-inverting input of the second analog comparator has a series resistor R8 and a parallel resistor R4, which are used to divide the voltage to obtain VR2.

5. The voltage detection circuit according to claim 1, characterized in that: A third analog comparator is also provided, which divides the 5V power supply voltage through the series resistor R9 and the parallel resistor R5, and obtains a reference voltage VR3=3V applied to the non-inverting input terminal. Then, VIN is compared with VR3 to obtain the output level signal 3 of HV-check1.

6. The voltage detection circuit according to claim 1, characterized in that: A fourth analog comparator is also provided, which divides the 5V power supply voltage by the series resistor R10 and the parallel resistor R6, and obtains a reference voltage VR4=4V applied at the non-inverting input terminal. Then, VIN is compared with VR4 to obtain the output level signal 4 of HV-check1.

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