Power supply driving circuit of water quality sensor

Abstract

The utility model discloses a power supply driving circuit of a water quality sensor, which is used for converting voltage provided by a power supply module into power supply voltage of the water quality sensor when the water quality sensor needs to measure water quality of sample water, and comprises a switch module, a voltage regulating module and an output module, the switch module is used for receiving a control signal and is switched on according to the control signal; the voltage regulating module is used for receiving voltage provided by the power supply module and providing current for the output module when the switch module is switched on, and the output module is used for outputting power supply voltage to the water quality sensor after obtaining the current. The power supply driving circuit has the following advantages that the power conversion circuit built by taking the voltage regulating module as the core converts the voltage provided by the power supply module into the power supply voltage of the water quality sensor, and the power supply on-off of the water quality sensor is controlled through the control instruction of the logic program of the controller, so that the water quality sensor is powered on at the measurement time and powered off at the non-measurement time.

Description

Technical Field

[0001] This utility model relates to the field of sensor power supply and drive circuit technology, specifically to a power supply and drive circuit for a water quality sensor. Background Technology

[0002] With the development of society and the economy and the improvement of people's living standards, increasingly higher requirements have been placed on the quality of tap water supply. To achieve this, multi-parameter water quality monitoring technology for tap water supply networks has emerged, serving as a powerful means to ensure that tap water supply quality meets standards. Simultaneously, with the continuous advancement of communication technology and the booming development of IoT technology based on wireless communication, relevant technical personnel have proposed the concept of self-operating water quality monitoring equipment. This requires the water quality monitoring equipment to operate with low power consumption, which necessitates the development of a power supply drive circuit for the water quality sensor. This circuit ensures that the water quality sensor only activates during monitoring periods. Specifically, when the controller's logic program sends a control command to the drive chip, a suitable voltage is provided to the power line of the water quality sensor, causing the sensor to automatically power on and enter working mode. When no voltage is supplied to the power line of the water quality sensor, it remains off, i.e., in a power-saving state. Utility Model Content

[0003] One technical problem this application aims to solve is to overcome the deficiencies of the above-mentioned related technologies and provide a power supply drive circuit for a water quality sensor that can provide a suitable voltage to the water quality sensor only when a control command is received.

[0004] The technical solution adopted by this utility model to solve the technical problem is as follows: a power supply drive circuit for a water quality sensor, used to convert the voltage provided by the power supply module into the power supply voltage of the water quality sensor when the water quality sensor needs to measure the water quality of the sample water, including a switching module, a voltage regulating module and an output module; the switching module is used to receive a control signal and turn on according to the control signal; the voltage regulating module is used to receive the voltage provided by the power supply module and provide current to the output module when the switching module is turned on, and the output module is used to output the power supply voltage to the water quality sensor after receiving the current.

[0005] Compared with related technologies, this application has the following advantages: The power supply drive circuit is a power conversion circuit built with a voltage regulation module as the core, which converts the voltage provided by the power module into the power supply voltage of the water quality sensor. Through the control instructions of the controller logic program, the power supply on and off of the water quality sensor is controlled so that it is powered on during the measurement time and powered off during the non-measurement time.

[0006] Preferably, the voltage regulation module includes a driver chip, the control pin of which is connected to the switching module; the drive pin of the driver chip is connected to the gate of a field-effect transistor (FET); multiple sources of the FET are connected between a first resistor and a second resistor; multiple drains of the FET are connected to an output module; the other end of the second resistor is grounded; the other end of the first resistor is connected to the enable pin of the driver chip; the enable pin is grounded through a first capacitor; the compensation pin of the driver chip is grounded through a second capacitor; the compensation pin is also grounded through a third resistor and a third capacitor connected in series; the voltage input pin of the driver chip is connected to the VBAT pin of the power supply module and is connected in parallel with a fourth capacitor and a fifth capacitor; the feedback pin of the driver chip is connected to the output module through a fourth resistor; and the feedback pin of the driver chip is also grounded through a fifth resistor. This voltage regulation module uses a driver chip as its core. Through the control instructions of the controller logic program and the enable pin of the driver chip, it controls the power supply to the water quality sensor, ensuring that it is powered on during measurement and powered off during non-measurement periods. The peripheral circuit of the driver chip converts the voltage provided by the power module into the power supply voltage for the water quality sensor, and the voltage is stabilized by the fourth and fifth capacitors to remove voltage ripple.

[0007] Preferably, the output module includes a first inductor, a sixth capacitor, a second inductor, a diode, and a seventh capacitor. One end of the first inductor is connected to the VBAT pin of the power module, and the other end of the first inductor is connected to the drain of the field-effect transistor. The other end of the first inductor is connected to the water quality sensor in sequence through the sixth capacitor and the diode. One end of the second inductor is connected between the sixth capacitor and the diode, and the other end of the second inductor is grounded. One end of the seventh capacitor is grounded, and the other end of the seventh capacitor is connected between the diode and the water quality sensor. One end of the fourth resistor is connected between the diode and the water quality sensor. The first inductor stabilizes the current, and the second inductor stabilizes the voltage.

[0008] Preferably, the switching module includes a MOSFET, a sixth resistor, a seventh resistor, and an eighth resistor. The gate of the MOSFET receives the control signal, and the gate is connected to the VCC electrode via the eighth resistor. The source of the MOSFET is grounded, and the drain of the MOSFET is connected to the control pin of the driver chip via the sixth resistor. The drain of the MOSFET is also connected to the VCC electrode via the seventh resistor. The sixth and seventh resistors are pull-up resistors used to clamp the control signal at a high level. Attached Figure Description

[0009] Figure 1 This is a circuit diagram of the present invention. Detailed Implementation

[0010] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0011] This implementation example Figure 1 The diagram shows a power supply drive circuit for a water quality sensor, used to convert the voltage provided by the power supply module into the power supply voltage for the water quality sensor when the water quality sensor needs to measure the water quality of the sample water. The circuit includes a switch module 1, a voltage regulating module 2, and an output module 3. The switch module 1 receives a control signal and turns on according to the control signal. The voltage regulating module 2 receives the voltage provided by the power supply module and provides current to the output module 3 when the switch module 1 is turned on. The output module 3, after receiving the current, operates to output the power supply voltage to the water quality sensor.

[0012] In this embodiment, the switching module 1 includes a MOSFET Q1, a sixth resistor R4, a seventh resistor R5, and an eighth resistor R6. The gate of the MOSFET Q1 is used to receive the control signal. The gate of the MOSFET Q1 is connected to the electrode VCC through the eighth resistor R6. The source of the MOSFET Q1 is grounded. The drain of the MOSFET Q1 is connected to the control pin FA / SYNS / SD of the driver chip through the sixth resistor R4. The drain of the MOSFET Q1 is also connected to the electrode VCC through the seventh resistor R5.

[0013] In this embodiment, the voltage regulation module 2 includes a driver chip, which is an LM3488 chip. The control pins FA / SYNS / SD of the driver chip are connected to the switching module 1. The drive pin DR of the driver chip is connected to the gate of the field-effect transistor Q2. Multiple sources of the field-effect transistor Q2 are connected between a first resistor R2 and a second resistor R3. Multiple drains of the field-effect transistor Q2 are connected to the output module 3. The other end of the second resistor R3 is grounded. The other end of the first resistor R2 is connected to the enable pin ISEN of the driver chip. The enable pin ISEN is grounded through a first capacitor C1. The compensation pin COMP of the driver chip is grounded through a second capacitor C2. The compensation pin COMP is also grounded through a third resistor R1 and a third capacitor C3 connected in series. The voltage input pin VIN of the driver chip is connected to the pin VBAT of the power supply module and is connected in parallel with a fourth capacitor C4 and a fifth capacitor C5. The feedback pin FB of the driver chip is also grounded through a fifth resistor R8. The feedback pin FB of the driver chip is connected to the output module 3 through a fourth resistor R7.

[0014] In this embodiment, the output module 3 includes a first inductor L1, a sixth capacitor C6, a second inductor L2, a diode D1, and a seventh capacitor C7. One end of the first inductor L1 is connected to the VBAT pin of the power module, and the other end of the first inductor L1 is connected to the drain of the field-effect transistor Q2. The other end of the first inductor L1 is connected to the water quality sensor in sequence through the sixth capacitor C6 and the diode D1. One end of the second inductor L2 is connected between the sixth capacitor C6 and the anode of the diode D1, and the other end of the second inductor L2 is grounded. One end of the seventh capacitor C7 is grounded, and the other end of the seventh capacitor C7 is connected between the cathode of the diode D1 and the water quality sensor. One end of the fourth resistor R7 is connected between the cathode of the diode D1 and the water quality sensor.

[0015] Specifically, when the water quality sensor does not require power, the controller logic program controls the I / O port pins to be in a low-level state, the MOSFET Q1 is not turned on, and the ISEN enable pin of the LM3488 chip is in a high-level state. At this time, the LM3488 chip is in sleep mode, and the water quality sensor is not powered. When the water quality sensor requires power, the microcontroller program controls the I / O port pins to be in a high-level state, the MOSFET Q1 is turned on, and the ISEN enable pin of the LM3488 chip is turned low. At this time, the LM3488 chip works normally and powers the water quality sensor.

[0016] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A power supply drive circuit for a water quality sensor, used to convert the voltage provided by the power module into the power supply voltage of the water quality sensor when the water quality sensor needs to measure the water quality of a sample water, characterized in that, It includes a switching module, a voltage regulating module, and an output module; the switching module is used to receive a control signal and turn on according to the control signal; the voltage regulating module is used to receive the voltage provided by the power supply module and provide current to the output module when the switching module is turned on; the output module is used to output a power supply voltage to the water quality sensor after receiving the current. The voltage regulation module includes a driver chip, whose control pin is connected to the switching module; the driver chip's drive pin is connected to the gate of a field-effect transistor (FET); multiple sources of the FET are connected between a first resistor and a second resistor; multiple drains of the FET are connected to the output module; the other end of the second resistor is grounded; the other end of the first resistor is connected to the enable pin of the driver chip; the enable pin is grounded through a first capacitor; the compensation pin of the driver chip is grounded through a second capacitor; the compensation pin is also grounded through a third resistor and a third capacitor connected in series; the voltage input pin of the driver chip is connected to the VBAT pin of the power supply module and is connected in parallel with a fourth capacitor and a fifth capacitor; the feedback pin of the driver chip is connected to the output module through a fourth resistor; the feedback pin of the driver chip is also grounded through a fifth resistor. The output module includes a first inductor, a sixth capacitor, a second inductor, a diode, and a seventh capacitor. One end of the first inductor is connected to the VBAT pin of the power module, and the other end of the first inductor is connected to the drain of the field-effect transistor. The other end of the first inductor is connected to the water quality sensor in sequence through the sixth capacitor and the diode. One end of the second inductor is connected between the sixth capacitor and the diode, and the other end of the second inductor is grounded. One end of the seventh capacitor is grounded, and the other end of the seventh capacitor is connected between the diode and the water quality sensor. One end of the fourth resistor is connected between the diode and the water quality sensor.

2. The power supply and drive circuit for the water quality sensor according to claim 1, characterized in that, The switching module includes a MOSFET, a sixth resistor, a seventh resistor, and an eighth resistor. The gate of the MOSFET is used to receive the control signal. The gate of the MOSFET is connected to the electrode VCC through the eighth resistor. The source of the MOSFET is grounded. The drain of the MOSFET is connected to the control pin of the driver chip through the sixth resistor. The drain of the MOSFET is also connected to the electrode VCC through the seventh resistor.

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