CN213185552U

CN213185552U - Coulomb meter MCU controller of miniaturized radio frequency device

Info

Publication number: CN213185552U
Application number: CN202021822970.7U
Authority: CN
Inventors: 陈剑雪
Original assignee: Shanghai University of Engineering Science
Current assignee: Shanghai University of Engineering Science
Priority date: 2020-08-27
Filing date: 2020-08-27
Publication date: 2021-05-11
Anticipated expiration: 2030-08-27

Abstract

The utility model relates to a miniaturized radio frequency device's coulometer MCU controller, including MCU chip module, the CPLD controller, the OLED connector, the charge-discharge module, UART1 connector, 12V input connector, the coulometer, load connector and battery connector, MCU chip module respectively with UART1 connector, the CPLD controller, OLED connector and coulometer are connected, the CPLD controller is connected to 12V input connector's output, coulometer and charge-discharge module are connected respectively to the output of CPLD controller, charge-discharge module and coulometer, the battery connector, the load connector is connected respectively, the charge-discharge module includes charge module and discharge module, the OLED display screen is connected to the OLED connector. Compared with the prior art, the utility model has the advantages of can carry out reliable and stable charge-discharge control to portable radio frequency electron device, can show the electric quantity.

Description

Coulomb meter MCU controller of miniaturized radio frequency device

Technical Field

The utility model belongs to the technical field of portable electron device technique and specifically relates to a coulomb meter MCU controller of miniaturized radio frequency device is related to.

Background

At present, the electronic equipment industry, especially portable electronic devices, almost all require perfect charge and discharge functions. In the aspect of industrial design, it is a common industrial practice to design the electric quantity of a battery and control the charging and discharging of the battery based on the combination of an MCU and a coulometer, but for a portable radio frequency device, a targeted charging and discharging design is not provided at present, and electric quantity information cannot be obtained in time. In addition, the existing equipment cannot guarantee continuous and stable operation under the condition of any external environment abnormality.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a miniaturized radio frequency device's coulomb meter MCU controller in order to overcome the defect that above-mentioned prior art exists, this controller can carry out reliable and stable charge-discharge control to portable radio frequency electron device to can show the electric quantity, and to the accurate estimation of battery power when this controller supports battery temperature variation, possess according to the actual conditions of battery voltage, electric current and temperature and go to adjust charging current, and close the advantage of discharging when battery voltage is low excessively.

The purpose of the utility model can be realized through the following technical scheme:

the controller is embedded in the radio frequency device and connected with a radio frequency load circuit, and comprises an MCU chip module, a CPLD controller, an OLED connector, a charge-discharge module, a UART1 connector, a 12V input connector, a coulometer, a load connector and a battery connector, wherein the MCU chip module is respectively connected with the UART1 connector, the CPLD controller, the OLED connector and the coulometer, the output end of the 12V input connector is connected with the CPLD controller, the output end of the CPLD controller is respectively connected with the coulometer and a charge-discharge module, the charge-discharge module is respectively connected with the coulometer, the battery connector and the load connector, the charge-discharge module comprises a charge module and a discharge module, and the OLED connector is connected with an OLED display screen.

Further, the MCU chip module adopts a KL17Z256VFM4 singlechip.

Further, the CPLD controller adopts a charging controller BQ25713B, and the charging controller BQ25713B is connected with a KL17Z256VFM4 singlechip, an input voltage and a coulometer through a printed circuit.

Further, the coulometer adopts a BQ34110 coulometer.

Further, the charging module comprises a current-limiting resistor, a power filter, a short-circuit protection circuit and an overcharge protection circuit.

Furthermore, the discharging module comprises a current-limiting resistor, an over-discharge protection circuit, a pulse jitter protection circuit and a time delay circuit.

Further, the overcharge protection circuit comprises two field effect transistors.

Further, the over-discharge protection circuit comprises an MOS tube.

Further, the configuration of the KL17Z256VFM4 singlechip fixed pin includes UART, SWD, GPIO pin and clock configuration, and the time for initializing the system clock serial port adopts a 1 millisecond timer.

Further, the voltage parameter of the built-in hardware current limiting circuit of the charging electric controller BQ25713B is set to be 3.3V, and the current limiting is 11.5A.

Compared with the prior art, the utility model discloses following beneficial effect has:

1) the KL17Z256VFM4 single-chip microcomputer is connected with the charge-discharge module through a coulometer, and the KL17Z256VFM4 single-chip microcomputer is connected with the OLED display screen, so that stable and reliable charge-discharge control can be performed on the portable radio-frequency electronic device, and the electric quantity can be displayed.

2) The utility model discloses combination MCU and CPLD can realize complete processing of makeing mistakes and prevention design, combine the module of charging and discharging, the module of charging is equipped with current-limiting resistor, power filter, short-circuit protection and overcharge protection circuit, and the module of discharging is equipped with current-limiting resistor, overdischarge protection circuit, pulse jitter protection and delay circuit for the condition that the load was closed to the exception handling mechanism mainly has: the current exceeds the limit, and the load is closed; if the temperature exceeds the limit, the load is closed; current drain to 0 turns off the load; the load is closed by the action of the button, so that the whole set of complete exception handling mechanism ensures that the equipment can stably work under the exception condition of any external environment.

3) The coulometer is used for current, voltage and temperature acquisition, the coulometer is connected with KL17Z256VFM4 singlechip, the charge controller, the charge and discharge module respectively, data such as the temperature of the battery and the estimated battery capacity are input into KL17Z256VFM4 singlechip, if the battery temperature is too high or the charge current is too large, the charge current can be reduced by the charge controller, if the battery voltage, the temperature or the charge current are out of limit, the power supply of an external actual control mainboard is switched on and off through the charge and discharge module, the load is closed in time, further, the overload temperature and the current of the power amplifier are prevented from being out of limit, and the stable work of the equipment under the condition of any external environment abnormity is ensured.

4) The KL17Z256VFM4 singlechip is provided with UARTs and SWDs for fixing pins, so that the functions of GPIO pins are fixed, and the overall reliability is improved; the time for initializing the serial port of the system clock in the configuration of the clock uses a 1ms reference, so that the reliability of the serial port can be enhanced, and the influence of illegal input of each pin due to an external abnormal state on the function of the KL17Z256VFM4 single chip microcomputer can be prevented.

5) The voltage parameter of the built-in hardware current-limiting circuit of the BQ25713B is set to be 3.3V, and the current limitation of the current is 11.5A, so that the safety of the whole circuit is further ensured.

Drawings

FIG. 1 is a schematic diagram of the structure of a Coulomb meter MCU controller of a miniaturized radio frequency device in an embodiment;

FIG. 2 is a circuit design diagram of the KL17Z256VFM4 single chip microcomputer in the embodiment;

FIG. 3 shows the communication and control interface definition between the KL17Z256VFM4 single chip microcomputer and the CPLD controller in the embodiment;

FIG. 4 is a circuit diagram of a charging module according to an embodiment;

fig. 5 is a circuit configuration diagram of the discharge module in the embodiment.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.

Examples

The utility model relates to a miniaturized radio frequency device's coulomb meter MCU controller, this controller embedding radio frequency device in to be connected with radio frequency load circuit, this controller includes MCU chip module, CPLD controller, OLED connector, charge-discharge module, UART1 connector, 12V input connector, coulomb meter, load connector and battery connector.

The MCU chip module is respectively connected with the UART1 connector, the CPLD controller, the OLED connector and the coulometer, the output end of the 12V input connector is connected with the CPLD controller, the output end of the CPLD controller is respectively connected with the coulometer and the charge-discharge module, and the charge-discharge module is respectively connected with the coulometer, the battery connector and the load connector.

In this embodiment, the MCU chip module employs a KL17Z256VFM4 single chip, supports serial port connection and baseband SoC main chip communication, supports receiving control instructions issued by the CPLD controller, and supports various query and control logic definitions. The CPLD controller adopts a charge controller BQ25713B, is connected with a KL17Z256VFM4 singlechip, an input voltage and a coulometer through a printed circuit, provides two working modes of an external dial switch and serial port program configuration, and is particularly connected with the KL17Z256VFM4 singlechip through an I2C0 bus. The coulometer adopts BQ34110 coulometer, and is connected with KL17Z256VFM4 singlechip through I2C0 bus. The KL17Z256VFM4 single-chip microcomputer is connected with an OLED connector through an I2C1 bus, the OLED connector is connected with an OLED display screen, the OLED display screen adopts an SSD1306 display screen, and the display screen supports Chinese character dot matrix display and a noctilucent eye protection mode.

The utility model discloses a configuration of the fixed pin of KL17Z256VFM4 singlechip includes UART, SWD, and the configuration of the unchangeable GPIO foot of function and clock, the time of initialization system clock serial ports uses 1 millisecond timer. The specific circuit layout is shown in fig. 2. Default state of pin: the default state of the pin I2C0 is set as input, and bq34110 CE outputs low; the OLED pin is designed to be in an open state by default; the default output of the EN _ PWR pin is closed; the default is to wait for a key input. Different from the design of common variable pins, the utility model discloses KL17Z256VFM4 singlechip fixes the configuration UART of pin, SWD, keeps GPIO pin function fixed, promotes whole reliability; the time for initializing the serial port of the system clock in the configuration of the clock uses a 1ms reference, so that the reliability of the serial port is enhanced; the default state of the pin I2C0 is set as input, and the coulometer BQ34110 CE outputs low level; the OLED pin is designed to be in an open state by default; the default output of the EN _ PWR pin is closed; the default is waiting for key input, so that the function of the MCU chip can be prevented from being influenced by illegal input caused by external abnormal states of all pins.

As shown in fig. 3, various communication and control interface definitions between the KL17Z256VFM4 single chip microcomputer and the CPLD controller are given, and switching signals are defined. A first serial port of the KL17Z256VFM4 singlechip is a system debugging serial port, if an epd pin switching signal is 1, the first serial port is not externally connected, and if the epd pin switching signal is 0, the first serial port is connected with a debugging connector; the second serial port of the KL17Z256VFM4 singlechip is connected to the GPS module, the third serial port of the KL17Z256VFM4 singlechip is connected to the data communication serial port of the ESP8285 chip, the fourth serial port of the KL17Z256VFM4 singlechip can be switched by a software register, when the fourth UART chip selection signal is 00, the fourth UART chip selection signal is connected to the EC20 debugging serial port, when the fourth UART chip selection signal is 01, the fourth UART chip selection signal is a T connector serial port, when the fourth UART chip selection signal is 11, the fourth UART chip selection signal is WIFI UART1, when the fourth UART chip selection signal is 10, if the epd pin switching signal is 1, the debugging connector is connected.

The charging and discharging module is used for realizing charging and discharging of the battery, is designed and distributed together when a PCB is distributed, is respectively connected with the MCU, the external load and other power utilization modules, is not independent in form, but is independent in function. The connection diagram of the charging module is shown in fig. 4. The charging module in the figure mainly comprises four parts of a current-limiting resistor, a power supply filter, a short-circuit protection circuit and an overcharge protection circuit, and compared with alternating-current charging, the charging module is externally provided with a voltage stabilizing circuit, and is concise, stable and reliable in design. The overcharge protection circuit mainly comprises two field effect transistors, the battery voltage is monitored and controlled by a protection IC, and when the battery voltage rises to 14.2V, the field effect transistors are cut off to stop charging. In order to prevent misoperation, a delay capacitor is added to an external circuit. A time delay circuit is added in the circuit to distinguish surge current from short-circuit current.

The discharge module connection diagram is shown in fig. 5. The discharging module mainly comprises a current-limiting resistor, an over-discharging protection circuit, a pulse jitter protection circuit and a time delay circuit (anti-surge). The over-discharge protection circuit mainly comprises a single MOS tube. When the battery voltage drops to 7.55V while the battery is in a discharged state, power supply to the load is stopped. The over-current protection also controls the over-discharge control tube to cut off when a large current flows through the load, and stops discharging to the load, and the purpose is to protect the battery and the MOS tube. The overcurrent detection is to monitor the voltage drop of the MOS transistor using its on-resistance as a detection resistance, and to stop the discharge when the voltage drop exceeds a set value.

For the coulometer in the charge-discharge functional product, on the basis of superposing the MCU and the CPLD chip, the signal detection and the combination control of the external chip can be effectively carried out, and on the basis of realizing the accurate estimation of the battery electric quantity in the charge-discharge process by the coulometer, the charge-discharge process of the whole radio frequency device and the power consumption of the whole radio frequency device are finely, stably and reliably controlled, which is very important in the radio frequency device.

In fig. 1, the KL17Z256VFM4 single chip microcomputer mainly has the functions of managing a boost battery charging controller BQ25713B, measuring data such as battery capacity and the like through a coulometer BQ34110, sending the battery capacity and related information to an OLED display screen, and exchanging information with other boards through serial ports, thereby playing a central role in comprehensive management and control configuration.

The coulometer BQ34110 is used for collecting current, voltage and temperature, the data such as the temperature of the battery and the estimated battery capacity are input into a KL17Z256VFM4 singlechip, and if the temperature of the battery is too high or the charging current is too large, the charging current is reduced through a charging controller BQ 25713B. If the voltage, the temperature or the charging current of the battery exceed the limit, the power supply of the external actual control mainboard of the switch is switched on and off through the charging and discharging module, the load is closed in time, the power amplifier overload temperature and the current are prevented from exceeding the limit, and the stable work of the equipment under the abnormal condition of any external environment is ensured.

The charge controller BQ25713B mainly functions as a charge control chip to control the charging and discharging of the battery. As preferred scheme, in order to improve the through-current capacity of whole circuit, two adjustable sampling resistance in its built-in hardware current-limiting circuit have all reduced the resistance, have changed in the charge controller BQ25713B setting about the electric current, the utility model discloses set up BQ 25713B's built-in hardware current-limiting circuit voltage parameter to 3.3V, then the current-limiting of electric current is 11.5A. This ensures the safety of the whole circuit, which is also the basis for a stable operation of the whole product.

The coulomb meter BQ34110 provides an RC integration circuit to obtain the voltage versus time integral value. Therefore, the current electric quantity of the battery can be calculated more accurately. The coulometer BQ34110 is also internally provided with an automatic algorithm for realizing the adjustment of the battery capacity to the temperature, and the calculation adjustment of the available capacity is carried out according to the actual temperature of the battery. In addition, a battery identification code recording function is additionally integrated, the factory serial number of the battery is sent to a KL17Z256VFM4 single chip microcomputer through an I2C0 bus in the figure 1 to carry out commercial logic judgment, and whether the battery is original factory or not is judged.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The controller is embedded in the radio frequency device and connected with a radio frequency load circuit, and comprises an MCU chip module, a CPLD controller, an OLED connector, a charge-discharge module, a UART1 connector, a 12V input connector, a coulometer, a load connector and a battery connector, wherein the MCU chip module is respectively connected with the UART1 connector, the CPLD controller, the OLED connector and the coulometer, the output end of the 12V input connector is connected with the CPLD controller, the output end of the CPLD controller is respectively connected with the coulometer and a charge-discharge module, the charge-discharge module is respectively connected with the coulometer, the battery connector and the load connector, the charge-discharge module comprises a charge module and a discharge module, and the OLED connector is connected with an OLED display screen.

2. The coulomb counter MCU controller of a miniaturized radio frequency device according to claim 1, wherein the MCU chip module employs a KL17Z256VFM4 single chip microcomputer.

3. The coulomb counter MCU controller of the miniaturized radio frequency device of claim 1, wherein the CPLD controller employs a charge controller BQ25713B, and the charge controller BQ25713B is connected to KL17Z256VFM4 single chip microcomputer, input voltage and coulomb counter through printed circuit.

4. The coulomb counter MCU controller of the miniaturized radio frequency device of claim 1, wherein the coulomb counter employs a BQ34110 coulomb counter.

5. The coulomb counter MCU controller of a miniaturized radio frequency device according to claim 1, wherein the charging module comprises a current limiting resistor, a power filter, a short circuit protection circuit and an overcharge protection circuit.

6. The coulomb counter MCU controller of a miniaturized radio frequency device according to claim 1, wherein the discharge module comprises a current limiting resistor, an over-discharge protection circuit, a pulse jitter protection circuit and a delay circuit.

7. The coulomb counter MCU controller of a miniaturized radio frequency device according to claim 5, wherein the overcharge protection circuit comprises two field effect transistors.

8. The coulomb counter MCU controller of a miniaturized radio frequency device according to claim 6, wherein the over-discharge protection circuit comprises a MOS transistor.

9. The coulomb counter MCU controller of miniaturized radio frequency devices of claim 2, wherein the configuration of the KL17Z256VFM4 singlechip fixed pin includes UART, SWD, GPIO pin and clock configuration, and the time for initializing the system clock serial port adopts 1 millisecond timer.

10. The coulomb counter MCU controller of a miniaturized radio frequency device according to claim 3, wherein the voltage parameter of the built-in hardware current limiting circuit of the charge electric controller BQ25713B is set to 3.3V, and the current limit is 11.5A.