A driving circuit for an intelligent terminal

Abstract

The present invention relates to a driving circuit for an intelligent terminal, comprising a power supply, a driving chip, a microcontroller and a supercapacitor. A supercapacitor is added to the existing driving circuit. The power supply no longer directly provides a driving signal for the valve driving chip, but instead provides drive for the valve driving chip through the supercapacitor. By utilizing the discharge capability of the supercapacitor, the power supply can discharge the supercapacitor to achieve a slow release of battery power, avoiding the problems caused by the power supply using a large current discharge to provide drive. At the same time, the power supply can drive driving devices with a current higher than its own maximum discharge current in segments to achieve the purpose of slow release of power and maximize battery energy utilization.

Description

Technical Field

[0001] The present invention relates to a driving circuit of an intelligent terminal, belonging to the technical field of intelligent terminal driving control. Background Art

[0002] At present, most terminals such as smart water meters and gas meters are powered by batteries. These terminals need to drive power devices such as valves and relays. Therefore, the output current of the battery is relatively high. Only by outputting a large current can the above power devices be driven. However, if the battery outputs a large current for a long time, it will cause the following problems: (1) Outputting a large current will cause the battery capacity to be lost too quickly. If a large-capacity battery is used, it will also mean an increase in the battery volume, resulting in inconvenience in installation and an increase in product costs for manufacturers. However, if a small-capacity battery is used, it will need to be replaced frequently, which will cause inconvenience. (2) According to the characteristics of the battery itself, outputting a large current will also cause the battery temperature to rise rapidly. Over time, it will cause damage to the internal structure of the battery and even cause an explosion accident. Summary of the Invention

[0003] The purpose of the present invention is to provide a driving circuit for an intelligent terminal, so as to solve the problem that the battery capacity is lost quickly and there are potential safety hazards caused by directly using a battery to drive the power device of the intelligent terminal.

[0004] To achieve the above-mentioned objectives, the present invention provides a driving circuit for an intelligent terminal, comprising a power supply, a driving chip, and a microcontroller and a supercapacitor. The power supply is connected to the supercapacitor for charging the supercapacitor, and the supercapacitor is connected to the driving chip for powering the driving chip. The microcontroller is provided with a voltage acquisition port for collecting the voltage of the supercapacitor. The microcontroller is used to control the device to be driven through the driving chip according to the collected voltage of the supercapacitor. When the collected voltage is greater than a first set threshold, the microcontroller controls the device to be driven to turn on through the driving chip. When the collected voltage is less than a second set threshold, the microcontroller controls the device to be driven to turn off through the driving chip.

[0005] The present invention adds a supercapacitor on the basis of the existing drive circuit. The power supply no longer directly provides a drive signal for the valve drive chip, but provides drive for the valve drive chip through the supercapacitor. By utilizing the discharge capacity of the supercapacitor, the power supply can discharge the supercapacitor to achieve a slow release of the battery power, avoiding the problems caused by the power supply using a large current discharge to provide drive.

[0006] Furthermore, in the driving circuit of the smart terminal, a current limiting resistor is provided on the charging circuit between the power supply and the supercapacitor.

[0007] Adding a current limiting resistor to the charging circuit can reduce the charging current and achieve the purpose of slowly releasing the power.

[0008] Furthermore, in the driving circuit of the intelligent terminal, the microcontroller is also provided with a position signal detection port for obtaining whether the device to be driven has reached its position, and controlling the device to be driven to be turned off through the driving chip when the position is detected.

[0009] The position signal detection port is set on the microcontroller to detect whether the driving device has reached its position, so as to obtain the driving device information in time. When the position is detected, the device stops working immediately to reduce energy consumption.

[0010] Furthermore, the driving circuit of the intelligent terminal and the power supply are also connected to the microcontroller to provide power for the microcontroller.

[0011] The battery directly provides power, and there is no need to provide additional power for the microcontroller, which is more convenient and reduces costs. In addition, the current of the microcontroller itself is very small and has little effect on the charging current and can be ignored.

[0012] Furthermore, the driving circuit of the intelligent terminal and the charging circuit are further provided with a diode.

[0013] Adding a diode to the charging circuit can make the current flow in one direction to prevent the capacitor from charging the power supply in reverse.

[0014] Furthermore, in the driving circuit of the intelligent terminal, the microcontroller is provided with a control signal output port, the driving chip is provided with a signal input port and a driving control port, the control signal output port of the microcontroller is connected to the signal input port of the driving chip, and the driving control port of the driving chip is used to connect to the device to be driven.

[0015] The microcontroller controls the output signal of the driver chip to drive devices with currents higher than their maximum discharge currents in segments, so as to achieve the purpose of slow discharge of power and maximize battery energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 1 is a schematic diagram of a control circuit of the present invention;

[0017] Figure 2 It is a characteristic diagram of battery discharge current and capacity. DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below with reference to the accompanying drawings.

[0019] An embodiment of a driving circuit for a smart terminal.

[0020] The driving circuit of the intelligent terminal of the present invention includes a microcontroller U1, a valve driving chip U2, a power supply BAT and a super capacitor C1. Figure 1 As shown, the microcontroller U1 includes 6 ports, namely the power supply terminal VCC, the ground terminal GND, the voltage acquisition terminal ADC1, the control signal output terminals PA1 and PA2, and the feedback signal acquisition terminal PB1; the valve driver chip U2 includes 8 ports, namely the power supply terminal VCC, the ground terminal GND, the input terminals IN1, IN2 and IN3, the output terminals OUT1 and OUT2, and the voltage terminal VM; the power supply BAT provides power for the microcontroller U1, is connected to the VCC terminal of the microcontroller U1, and is connected to the supercapacitor C1 through the diode D1 and the current limiting resistor R1 for charging the supercapacitor; the supercapacitor C1 is connected to the VCC terminal of the valve driver chip to provide power for the valve driver chip U2; the microcontroller U1 is connected to the VCC terminal of the valve driver chip through ADC1 The port is connected to the positive electrode VF of the supercapacitor and is used to collect the voltage value of the supercapacitor C1. The microcontroller U1 is connected to the ports IN1 and IN2 of the valve driver chip U2 through the ports PA1 and PA2 respectively, and is used to control the valve driver chip U2 through the two ports PA1 and PA2. The valve driver chip U2 outputs corresponding drive signals through ports OUT1 and OUT2 according to the information received from ports IN1 and IN2, which are used to be connected to the drive pins A and B of the electric ball valve M1 respectively, thereby driving the electric ball valve M1 to open or close; the pin C of the electric ball valve M1 is used to output a valve in place signal, and the PB1 port of the microcontroller U1 is used to be connected to the pin C of the electric ball valve M1 to obtain the in place signal of the electric ball valve M1.

[0021] The driving circuit operates as follows: while the power supply is supplying power to the microcontroller U1, it simultaneously charges the supercapacitor C1 through the diode D1 and the resistor R1. The microcontroller U1 monitors the supercapacitor voltage through its ADC1 port. When the supercapacitor voltage exceeds a first set threshold, the microcontroller U1 determines that the supercapacitor is capable of driving the electric ball valve. At this point, the microcontroller U1 outputs a valve-open control signal to ports IN1 and IN2 of the valve driver chip U2 through ports PA1 and PA2. The valve driver chip U2 controls ports OUT1 and OUT2 to output valve-open signals based on the signals from ports IN1 and IN2, thereby controlling the opening of the electric ball valve. When the supercapacitor voltage is detected to be less than a second set threshold, the microcontroller U1 determines that the current supercapacitor voltage is too low to drive the electric ball valve. At this point, the microcontroller U1 outputs a valve-close control signal to ports IN1 and IN2 of the valve driver chip U2 through ports PA1 and PA2. The valve driver chip U2 controls ports OUT1 and OUT2 to output valve-close signals based on the signals from ports IN1 and IN2, thereby controlling the closing of the electric ball valve. During the process of valve opening, the microcontroller U1 determines whether the valve is in place through port PB1. If it is in place, the microcontroller U1 outputs the valve closing control signal to the valve drive chip U2 through ports PA1 and PA2 to turn off the valve drive signal, and the valve action is completed.

[0022] During the entire process, the power supply no longer directly provides a driving signal to the valve driver chip, but instead provides drive for the valve driver chip through a supercapacitor. By utilizing the discharge capability of the supercapacitor, the power supply can discharge the supercapacitor to achieve a slow release of the battery power, avoiding the problems caused by the power supply using a large current discharge to provide drive.

[0023] As another embodiment, the electric ball valve M1 in this embodiment can also be other driving devices, such as relays. In this embodiment, the magnitude of the first set threshold and the second set threshold are related to the actual parameters of the components in the circuit. When the power supply is a 3.6V lithium battery with a maximum continuous discharge current of 100mA and the maximum operating current of the electric ball valve M1 is 400mA, the second set threshold is 3.3V and 2.7V, that is, when the voltage of the supercapacitor C1 is detected to be higher than 3.3V, the PA1 and PA2 ports of the microcontroller U1 output a valve opening signal, which controls the OUT1 and OUT2 pins of the valve driver chip U2 to drive the valve to open; if the voltage of the supercapacitor C1 is detected to be lower than 2.7V, the PA1 and PA2 ports of the microcontroller U1 output a valve closing signal, which controls the OUT1 and OUT2 pins of the valve driver chip U2 to drive the valve to close, thereby stopping the operation of the electric ball valve M1.

[0024] During the above process, the supercapacitor voltage VF remains between 2.7V and 3.6V. The 3.6V lithium battery is stepped down to 3.3V via diode D1. If the minimum VF voltage is 2.7V, the maximum charging voltage difference is 0.6V. Resistor R1 limits the charging current, achieving a slow discharge. If the resistance of resistor R1 is 51 ohms, it can be calculated that the maximum charging current is 11.7mA. When the 3.6V lithium battery is first powered on, supercapacitor C1 needs to be charged from 0V to above 2.7V. Throughout the rest of its lifecycle, the discharge current is less than or equal to 11.7mA (the current of microcontroller U1 is very small and can be ignored here), allowing the battery to release a larger capacity.

[0025] like Figure 2 As shown in the figure, under the condition of continuous discharge at a discharge current of 35mA, the battery capacity is 3.10Ah. Under the condition of continuous discharge at a discharge current of 0.1mA, the battery capacity is 3.6Ah. According to the figure, it can be concluded that when the battery discharge current is greater than 3mA, the smaller the battery discharge current, the greater the capacity the battery can release.

[0026] The above analysis shows that the lithium battery can drive a valve with a maximum current of 400mA in segments to open and close the valve at a maximum current of 11.7mA. Furthermore, the lithium battery's output current is relatively low throughout its lifecycle, allowing it to output a greater battery capacity. This allows the battery to drive a device with a current greater than its own discharge capacity, while also achieving stable, slow, and efficient output.

Claims

1. A driving circuit for an intelligent terminal, comprising a power supply and a driving chip, characterized in that: The drive circuit also includes a microcontroller and a supercapacitor, wherein a power supply is connected to the supercapacitor for charging the supercapacitor, and the supercapacitor is connected to a driver chip for driving the device to be driven through the driver chip. The microcontroller is provided with a voltage acquisition port for acquiring the voltage of the supercapacitor. The microcontroller is configured to control the device to be driven through the driver chip according to the acquired voltage of the supercapacitor. When the acquired voltage is greater than a first set threshold, the microcontroller drives the device to be driven through the driver chip. When the acquired voltage is less than a second set threshold, the microcontroller stops driving the device to be driven through the driver chip. The first set threshold is the voltage required by the driver chip to drive the device to be driven, and the second set threshold is the voltage that the driver chip cannot drive the device to be driven.

2. The driving circuit of the intelligent terminal according to claim 1, characterized in that: A current limiting resistor is provided on the charging circuit between the power supply and the supercapacitor.

3. The driving circuit of the intelligent terminal according to claim 1, characterized in that: The microcontroller is also provided with a position signal detection port for obtaining whether the device to be driven has reached its position, and controlling the device to be driven to be turned off through the driver chip when the position is detected.

4. The driving circuit of the intelligent terminal according to claim 1 or 2, characterized in that: The power supply is also connected to the microcontroller to provide power to the microcontroller.

5. The driving circuit of the intelligent terminal according to claim 2, characterized in that: The charging circuit is also provided with an anti-reverse diode, which is used to make the current in the charging circuit flow only from the power supply to the supercapacitor.

6. The driving circuit of the intelligent terminal according to claim 1, characterized in that: The microcontroller is provided with a control signal output port, and the driver chip is provided with a signal input port and a drive control port. The control signal output port of the microcontroller is connected to the signal input port of the driver chip, and the drive control port of the driver chip is used to connect to the device to be driven.

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