Charger management device

Abstract

The utility model provides a charger management device, and belongs to the technical field of charger monitoring. The charger management device comprises a control unit, a remote monitoring unit, an alternating current detection unit, a direct current detection unit, a first communication unit and a power supply unit. The alternating current detection unit detects alternating current input into the charger in real time to obtain alternating current detection signals, the direct current detection unit detects direct current output by the charger in real time to obtain direct current detection signals, and the control unit calculates the alternating current detection signals to obtain first calculation processing information. The control unit calculates the direct current detection signal to obtain second calculated information, and the control unit sends the first calculation processing information and / or the second calculation processing information to the remote monitoring unit, so that remote monitoring of the charger is realized, the safety and management efficiency of the charger can be improved, and the safety of the charger is improved. And the new energy power vehicle can be ensured to obtain timely and stable charging service.

Description

Technical Field

[0001] The utility model relates to the technical field of charger monitoring, and particularly relates to a charger management device. Background Art

[0002] New energy powered vehicles such as forklifts, straddle carriers, and trailers are increasingly used in the industrial field. These new energy powered vehicles rely on a complete charging infrastructure, and the research on the charger management control system plays a key role in promoting their overall development. At present, there are still problems of non-standard and imperfect management in the construction of industrial equipment charging facilities. Traditional chargers generally operate independently in an offline form. The management of chargers is generally controlled by staff on-site through panel operations. Managers cannot centrally monitor the operating status of chargers and cannot perform remote control in case of abnormalities. Summary of the Utility Model

[0003] The purpose of the utility model is to propose a charger management device for the deficiencies of the above-mentioned existing technologies.

[0004] The utility model proposes a charger management device, which includes a control unit, a remote monitoring unit, an AC detection unit, a DC detection unit, a first communication unit, and a power supply unit; the power supply unit is used to convert the AC voltage input by the mains power supply device into corresponding DC voltages that can be used by the control unit, the AC detection unit, the DC detection unit, the monitoring and alarm unit, and the external communication unit respectively; the AC detection unit is used to detect the alternating current input into the charger in real time to obtain an AC detection signal; the DC detection unit is used to detect the direct current output by the charger in real time to obtain a DC detection signal; the control unit is respectively connected to the AC detection unit and the DC detection unit; the control unit is connected to the remote monitoring unit through the first communication unit.

[0005] Further, it also includes a temperature detection circuit for detecting the real-time temperature of the charger and an alarm circuit for alarming under the control of the control unit when the real-time temperature is greater than the preset temperature.

[0006] Further, the power supply unit includes a switching power supply module, a low-pass filter module, and a voltage stabilizing module. The switching power supply module is used to convert the AC 220V voltage input by the mains power supply device into a digital DC 5V voltage. The low-pass filter module is used to convert the digital DC +5V voltage into an analog DC 5V voltage. The voltage stabilizing module can convert the digital DC 5V voltage into a digital DC 3.3V voltage, and the voltage stabilizing module can convert the analog DC 5V voltage into an analog DC 3.3V voltage.

[0007] Further, the control unit is a single-chip microcomputer, and the single-chip microcomputer includes a main control chip U85 and a storage chip U32 for storing the working parameters of the motor.

[0008] Further, the AC detection unit includes a voltage mutual induction module, a current mutual induction module, a first signal processing module, and an electric energy metering module; the voltage mutual induction module is used to reduce and convert the AC voltage input to the charger into a first voltage conversion signal, the current mutual induction module is used to reduce and convert the AC current input to the charger into a first current conversion signal, the first signal processing module includes a first differential filtering circuit for converting the first voltage conversion signal into a first differential voltage signal and inputting it into the electric energy metering module, and a second differential filtering circuit for converting the first current conversion signal into a second differential voltage signal and inputting it into the electric energy metering module, and the electric energy metering module is used to calculate and obtain corresponding AC detection signals from the first differential voltage signal and the second differential voltage signal respectively.

[0009] Further, the DC detection unit includes a second signal processing module and an analog-to-digital conversion module; the second signal processing module includes a voltage sampling circuit for collecting the DC voltage output by the charger and reducing the DC voltage to obtain a second voltage conversion signal, and a current amplification circuit for collecting the DC current output by the charger and amplifying the DC current to obtain a second current conversion signal, and the analog-to-digital conversion module is used to perform analog-to-digital conversion on the second voltage conversion signal and the second current conversion signal respectively to obtain corresponding DC detection signals. The first communication unit includes a WIFI module, an RS232 communication module, and an RS485 communication module respectively connected to the control unit

[0010] Further, the voltage mutual inductance module is a voltage transformer L2, the current mutual inductance module is a current transformer U19, the first differential filtering circuit includes resistors R3, R4, R5, R6, capacitors C1, C2, resistor R2, and the second differential filtering circuit includes resistors R10, R11, R7, R8, capacitors C3, C4, resistor R9. The electric energy metering module is an electric energy metering chip U2. The AC detection unit further includes a resistor R1 for current limiting. One end of the resistor R1 and one end of the voltage transformer L2 are respectively connected to the input end of the charger. The other end of the resistor R1 is connected to the other end of the voltage transformer L2. The resistor R2 and the capacitor C1 are both connected in parallel with the voltage transformer L2. One end of the resistor R3 is connected to one end of the capacitor C1 and the other end is connected to AGND. One end of the resistor R4 is connected to the other end of the capacitor C1 and the other end is connected to AGND. One end of the resistor R5 is connected to the end of the capacitor C1 connected to the resistor R3 and the other end is connected to the VIN+ pin of the electric energy metering chip U2. One end of the resistor R6 is connected to the end of the capacitor C1 connected to the resistor R4 and the other end is connected to the VIN- pin of the electric energy metering chip U2. Both ends of the capacitor C2 are respectively connected to the other ends of the resistor R5 and the resistor R6. The resistor R9 and the capacitor C4 are both connected in parallel with the capacitor transformer U19. One end of the resistor R10 and one end of the resistor R11 are respectively connected to both ends of the capacitor C4. The other end of the resistor R10 and the other end of the resistor R11 are respectively connected to AGND. One end of the resistor R7 is connected to the end of the capacitor C4 connected to the resistor R10 and the other end is connected to the IIN+ pin of the electric energy metering chip U2. One end of the resistor R8 is connected to the end of the capacitor C4 connected to the resistor R11 and the other end is connected to the IIN- pin of the electric energy metering chip U2. Both ends of the capacitor C3 are respectively connected to the other ends of the resistor R7 and the resistor R8.

[0011] Further, the voltage sampling circuit includes a resistor R122, a resistor R123, a resistor R124, and a first operational amplifier U110. The analog-to-digital conversion module is an analog-to-digital conversion chip U113. The current amplification circuit includes a resistor R128, a resistor R130, a resistor R131, a resistor R132, and a second operational amplifier U112. One end of the resistor R122 is connected to one end of the resistor R123. The other end of the resistor R123 is connected to the non-inverting input terminal of the first operational amplifier U110. The output terminal of the first operational amplifier U110 is connected to the CH1+ pin of the analog-to-digital conversion chip U113. One end of the resistor R131 is connected to the inverting input terminal of the second operational amplifier U112. One end of the resistor R128 is connected to the non-inverting input terminal of the second operational amplifier U112. One end of the resistor R130 is connected to the non-inverting input terminal of the second operational amplifier U112 and the other end is connected to AGND. Both ends of the resistor R132 are respectively connected to the inverting input terminal and the output terminal of the second operational amplifier U112. The output terminal of the second operational amplifier U112 is connected to the CH2+ pin of the analog-to-digital conversion chip U113.

[0012] Further, the SCLK pin of the electric energy metering chip U2 is respectively connected to the IO15 pin of the main control chip U85 and the SCK pin of the storage chip U32. The SDO pin of the electric energy metering chip U2 is respectively connected to the IO14 pin of the main control chip U85 and the SO pin of the storage chip U32. The CS# pin of the electric energy metering chip U2 is connected to the IO4 pin of the main control chip U85. The MODE pin of the electric energy metering chip U2 is connected to the IO37 pin of the main control chip U85. The E3# pin of the electric energy metering chip U2 is connected to the IO48 pin of the main control chip U85. The RESET# pin of the electric energy metering chip U2 is connected to the IO13 pin of the main control chip U85. The INT# pin of the electric energy metering chip U2 is connected to the IO12 pin of the main control chip U85. The E1# pin of the electric energy metering chip U2 is connected to the IO21 pin of the main control chip U85. The E2# pin of the electric energy metering chip U2 is connected to the IO47 pin of the main control chip U85. The SDI pin of the electric energy metering chip U2 is respectively connected to the IO2 pin of the main control chip U85 and the SI pin of the storage chip U32.

[0013] Further, the ADR0 pin of the analog-to-digital conversion chip U113 is connected to the IO9 pin of the main control chip U85. The ADR1 pin of the analog-to-digital conversion chip U113 is connected to the IO46 pin of the main control chip U85.

[0014] The charging machine management device of the present utility model has the following beneficial effects:

[0015] The AC detection unit detects the alternating current in the input charger in real time to obtain an AC detection signal, and the DC detection unit detects the direct current output by the charger in real time to obtain a DC detection signal. The control unit sends the AC detection signal and the DC detection signal to the remote monitoring unit through the first communication unit respectively, realizing remote monitoring of the charger, which can improve the safety and management efficiency of the charger and ensure that new energy-powered vehicles can obtain timely and stable charging services. Description of the Drawings

[0016] The drawings incorporated into the specification and constituting a part of the specification illustrate embodiments of the present invention and are used together with the description to explain the principles of the present invention. In these drawings, like reference numerals are used to represent like elements. The drawings in the following description are some embodiments of the present invention, not all embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a principle block diagram in a charger management device according to an embodiment of the present invention;

[0018] Figure 2 It is a circuit diagram of a control unit in a charger management device according to an embodiment of the present invention;

[0019] Figure 3 It is a circuit diagram of an RS232 communication module in a charger management device according to an embodiment of the present invention;

[0020] Figure 4 It is a circuit diagram of an RS485 communication module in a charger management device according to an embodiment of the present invention;

[0021] Figure 5 It is a circuit diagram of a voltage sampling circuit in a charger management device according to an embodiment of the present invention;

[0022] Figure 6 It is a circuit diagram of a current amplification circuit in a charger management device according to an embodiment of the present invention;

[0023] Figure 7 It is a circuit diagram of an analog-to-digital conversion module in a charger management device according to an embodiment of the present invention;

[0024] Figure 8 It is a circuit diagram of an AC detection unit in a charger management device according to an embodiment of the present invention;

[0025] Figure 9 It is a circuit diagram of a temperature detection circuit in a charger management device according to an embodiment of the present invention;

[0026] Figure 10 The circuit diagram of the alarm circuit in a charger management device according to an embodiment of the present utility model;

[0027] Figure 11 The principle block diagram of the power supply unit in a charger management device according to an embodiment of the present utility model. Specific embodiments

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other arbitrarily.

[0029] Please refer to Figures 1-11 A charger management device according to an embodiment of the present utility model includes a control unit, a remote monitoring unit, an AC detection unit, a DC detection unit, a first communication unit, and a power supply unit; the power supply unit is used to convert the AC voltage input by the mains power supply device into corresponding DC voltages that can be used by the control unit, the AC detection unit, the DC detection unit, the monitoring and alarm unit, and the external communication unit respectively; the AC detection unit is used to detect the alternating current input into the charger in real time to obtain an AC detection signal; the DC detection unit is used to detect the direct current output by the charger in real time to obtain a DC detection signal; the control unit is respectively connected to the AC detection unit and the DC detection unit; the control unit is connected to the remote monitoring unit through the first communication unit.

[0030] Here, the control unit sends the AC detection signal and the DC detection signal to the remote monitoring unit through the first communication unit respectively. After obtaining the AC detection signal and the DC detection signal, the remote monitoring unit can compare the AC detection signal and the DC detection signal with the corresponding preset values respectively, so as to obtain the charging status of the charger, which is convenient for fault diagnosis of the charger. Furthermore, it can improve the management efficiency of the charger, reduce the operation cost, improve the service quality, reduce resource waste, increase the utilization rate of the charger, promote the development of the industrial new energy power vehicle industry, and drive the construction and intelligent upgrading of the charger facilities, providing support for the improvement and healthy development of the industrial new energy power vehicle industry chain. This application can be used to control the charging current and charging voltage. A battery protection circuit is designed to monitor the battery status and realize functions such as overcharge protection, over-discharge protection, and short-circuit protection to ensure the safe charging and use of the battery. This application can remotely monitor and control the charger, including functions such as remote start / stop, charging parameter adjustment, and fault diagnosis, to ensure the safe and stable operation of the charger.

[0031] As a charger management device in this embodiment, it may further include a temperature detection circuit for detecting the real-time temperature of the charger and an alarm circuit for alarming under the control of the control unit when the real-time temperature is greater than the preset temperature.

[0032] Specifically, the temperature detection circuit can monitor the real-time temperature of the charger. When the alarm circuit alarms, it indicates that the real-time temperature is greater than the preset temperature, which can remind the user to disconnect the charger. Refer to Figure 9 , the temperature detection circuit can be a DS18B20 temperature sensor. It is a common digital temperature sensor that adopts a single-bus protocol and only needs one I / O port to connect to the single-chip microcomputer. It can directly convert the ambient temperature into a digital signal. The DS18B20 temperature sensor has the characteristics of small volume, low hardware cost, strong anti-interference ability, and high precision. The DS18B20 sensor is powered by a 3.3V power supply. The DS18B20 sensor includes a resistor R18 and a temperature detection chip U118. R18 is a current-limiting resistor used to protect the circuit from damage. One end of the resistor R18 is connected to the 3.3V power supply, and the other end is connected to pin 2 of the temperature detection chip U118. Pin 1 of the temperature detection chip U118 is connected to the 3.3V power supply, pin 3 is connected to GND, and pin 2 of the temperature detection chip U118 is connected to pin 7 of the chip U85.

[0033] Specifically, when the charger is running, if it is in abnormal states such as overvoltage, overcurrent, and overheating, the system protection will be triggered, and at the same time, the alarm system will be triggered and the buzzer will sound. Refer to Figure 10, the alarm circuit includes a resistor R21, a freewheeling diode D2, and a triode. One end of the resistor R21 is connected to the base of the triode, the emitter of the triode is connected to GND, the collector of the triode is connected to one end of the freewheeling diode D2, the other end of the freewheeling diode D2 is connected to the 3.3V power supply, and the other end of the resistor R21 is connected to pin 28 of the chip U85. When the alarm program is triggered, the level of the BEEP port of the single-chip microcomputer is pulled high through the program, the triode conducts, and the buzzer emits a sound. R21 is a current-limiting resistor, and D2 is a freewheeling diode to protect the circuit from reverse voltage breakdown of the triode.

[0034] The power supply unit can include a switching power supply module, a low-pass filter module, and a voltage regulator module. The switching power supply module is used to convert the input AC 220V voltage of the mains power supply device into a digital DC 5V voltage. The low-pass filter module is used to convert the digital DC +5V voltage into an analog DC 5V voltage. The voltage regulator module can convert the digital DC 5V voltage into a digital DC 3.3V voltage, and the voltage regulator module can convert the analog DC 5V voltage into an analog DC 3.3V voltage.

[0035] Specifically, refer to Figure 11 , the voltage regulator module can be an ASM1117 linear voltage regulator, and the switching power supply module can be an AC / DC-5V switching power supply module. The digital DC +5V voltage is converted into an analog DC -5V voltage through a B0505 power isolator. As a linear voltage regulator, the ASM1117 can stabilize the input voltage to the set output voltage through an internal feedback control circuit, and at the same time has overload protection and good stability, and is suitable for various application scenarios that require a stable power supply. The AC 220V voltage is input from the mains, converted into a digital DC +5V voltage through the AC / DC-5V switching power supply module, and can be converted into an analog DC -5V voltage through the B0505 power isolator. The digital DC 5V voltage can be converted into an analog DC 5V voltage through low-pass filtering. The digital and analog DC 5V voltages are then respectively converted into digital and analog DC 3.3V voltages through ASM1117-3.3.

[0036] The control unit can be an ESP32 single-chip microcomputer, which includes a main control chip U85 and a storage chip U85 connected to the main control chip U85 for storing the working parameters of the charger.

[0037] Specifically, the ESP32 is a high-performance, low-power WIFI and Bluetooth dual-mode system-on-chip, widely used in the Internet of Things industry. Using the ESP32 microcontroller, data can be transmitted to the host computer via WIFI to achieve the Internet of Things function, and web design can be carried out on the cloud platform. The ESP32 microcontroller has rich functions and flexibility, making it an ideal choice for Internet of Things applications and also meeting the Internet of Things control and peripheral requirements of the charger. The ESP32 microcontroller has a 32-bit dual-core processor, with built-in Bluetooth and WiFi, eliminating the need for external wireless communication sensors, which can reduce development costs and speed up development. Among them, the speed of WiFi is up to 150 Mbps, and the operating frequency range is 2.5 GHz. See Figure 2 , SW1 is the reset button; SW2 is the BOOT configuration button of the microcontroller. Pressing it indicates the download mode, and releasing it indicates the running mode; the storage chip U85 can be an EEPROM. The EEPROM is an electrically erasable programmable read-only memory, which is a storage chip that does not lose data after power-off.

[0038] The AC detection unit can include a voltage mutual induction module, a current mutual induction module, a first signal processing module, and an electric energy metering module; the voltage mutual induction module is used to reduce and convert the input AC voltage of the charger into a first voltage conversion signal, the current mutual induction module is used to reduce and convert the input AC current of the charger into a first current conversion signal, the first signal processing module includes a first differential filter circuit for converting the first voltage conversion signal into a first differential voltage signal and inputting it into the electric energy metering module, and a second differential filter circuit for converting the first current conversion signal into a second differential voltage signal and inputting it into the electric energy metering module. The electric energy metering module is used to calculate and obtain the corresponding AC detection signals from the first differential voltage signal and the second differential voltage signal respectively.

[0039] The DC detection unit can include a second signal processing module and an analog-to-digital conversion module; the second signal processing module includes a voltage sampling circuit for collecting the DC voltage output by the charger and reducing the DC voltage to obtain a second voltage conversion signal, and a current amplification circuit for collecting the DC current output by the charger and amplifying the DC current to obtain a second current conversion signal. The analog-to-digital conversion module is used to perform analog-to-digital conversion on the second voltage conversion signal and the second current conversion signal respectively to obtain the corresponding DC detection signals.

[0040] Specifically, the first communication unit includes a WIFI module, an RS232 communication module, and an RS485 communication module, which are respectively connected to the control unit.

[0041] Specifically, see Figure 3, the main function of the RS232 communication module circuit is code debugging or communication with the touch screen. The working mode of RS232 is a single-ended working mode, which is an unbalanced transmission mode. The logic levels of the transceiver signals are all relative to the signal ground. RS232 was originally for one-to-one communication between DTE (Digital Terminal Equipment) and DCE (Data Communication Equipment), generally used for full-duplex transmission and can also be used for half-duplex transmission. Since the level signal transmitted through the DSUB2 signal interface cannot be directly recognized after reaching the device, it will be converted into a recognizable TTL level signal through the level conversion chip MAX3232 to achieve communication. C58 is a filtering capacitor to filter out noise frequencies; C55, C56, and C57 are bypass decoupling capacitors to filter out power supply interference. The level conversion chip MAX3232 is chip U82. The pin 9 of chip U82 is connected to the pin 11 of the main control chip U85, and the pin 10 of chip U82 is connected to the pin 10 of the main control chip U85.

[0042] Specifically, refer to Figure 4 , the RS485 bus transmission protocol is a serial bus communication protocol standard. The RS485 bus adopts a balanced transmission and differential reception structure design, with the ability to suppress common-mode interference. RS485 uses a half-duplex working mode, and only one point can be in the sending state at any time. Therefore, the sending circuit must be controlled by an enable signal. In the RS485 communication network, the SP3485 level conversion chip is usually used to convert the communication differential signal into a single-ended TTL signal. The pin 2 of the level conversion chip SP3485 is the low-level reception enable, and the pin 3 is the high-level transmission enable. Only a signal RS485-RE is needed to control the transceiver process. U105 is a signal interface, R106 is a terminal matching resistor, R115 and R116 are high-power current-limiting resistors, and C99 is a bypass decoupling capacitor to filter out power supply interference. The SP3485 level conversion chip is chip U104. The pin 1 of chip U104 is connected to the pin 13 of the main control chip U85, the pin 2 and pin 3 of chip U104 are both connected to the pin 15 of the main control chip U85, and the pin 4 of chip U104 is connected to the pin 14 of the main control chip U85.

[0043] The voltage mutual inductance module is a voltage transformer L2, the current mutual inductance module is a current transformer U19, the first differential filtering circuit includes resistors R3, R4, R5, R6, capacitors C1, C2, and resistor R2, and the second differential filtering circuit includes resistors R10, R11, R7, R8, capacitors C3, C4, and resistor R9. The electric energy metering module is an electric energy metering chip U2. The AC detection unit further includes a resistor R1 for current limiting. One end of the resistor R1 and one end of the voltage transformer L2 are respectively connected to the input end of the charger. The other end of the resistor R1 is connected to the other end of the voltage transformer L2. The resistor R2 and the capacitor C1 are both connected in parallel with the voltage transformer L2. One end of the resistor R3 is connected to one end of the capacitor C1 and the other end is connected to AGND. One end of the resistor R4 is connected to the other end of the capacitor C1 and the other end is connected to AGND. One end of the resistor R5 is connected to the end of the capacitor C1 connected to the resistor R3 and the other end is connected to the VIN+ pin of the electric energy metering chip U2. One end of the resistor R6 is connected to the end of the capacitor C1 connected to the resistor R4 and the other end is connected to the VIN- pin of the electric energy metering chip U2. Both ends of the capacitor C2 are respectively connected to the other ends of the resistor R5 and the resistor R6. The resistor R9 and the capacitor C4 are both connected in parallel with the capacitor transformer U19. One end of the resistor R10 and one end of the resistor R11 are respectively connected to both ends of the capacitor C4. The other end of the resistor R10 and the other end of the resistor R11 are respectively connected to AGND. One end of the resistor R7 is connected to the end of the capacitor C4 connected to the resistor R10 and the other end is connected to the IIN+ pin of the electric energy metering chip U2. One end of the resistor R8 is connected to the end of the capacitor C4 connected to the resistor R11 and the other end is connected to the IIN- pin of the electric energy metering chip U2. Both ends of the capacitor C3 are respectively connected to the other ends of the resistor R7 and the resistor R8.

[0044] Specifically, refer to Figure 8 , the model of the electric energy metering chip U2 is CS5463. One end of the resistor R5 is connected to the end of the capacitor C1 connected to the resistor R3 and the other end is connected to pin 9 of the electric energy metering chip U2. One end of the resistor R6 is connected to the end of the capacitor C1 connected to the resistor R4 and the other end is connected to pin 10 of the electric energy metering chip U2. One end of the resistor R7 is connected to the end of the capacitor C4 connected to the resistor R10 and the other end is connected to pin 16 of the electric energy metering chip U2. One end of the resistor R8 is connected to the end of the capacitor C4 connected to the resistor R11 and the other end is connected to pin 15 of the electric energy metering chip U2.

[0045] Specifically, refer to Figure 8, the AC detection unit further includes a crystal oscillator X1, a capacitor C43, and a capacitor C44. X1 is a crystal oscillator that generates an external clock signal to drive its internal circuit and then filters it through the capacitor C43 and the capacitor C44, and inputs it to the clock input terminal of the chip CS5463. To improve the acquisition accuracy, all resistors are precision resistors with an accuracy of 0.1%. R1 is a high-power current-limiting resistor, and L2 is a voltage transformer whose main function is to convert a large current into a standard small current signal. The bias resistors R3 and R4 in the detection circuit are used to convert the sampling signal into a differential signal; the anti-aliasing filter of the voltage channel is composed of R5, R6, and C2, and the voltage input is filtered through C1, which helps to reduce electromagnetic interference and ensure the stability of the input voltage. R2 is a sampling resistor, and finally a differential voltage signal that meets the requirements is obtained and sent to the circuit for real-time calculation. U19 is a current transformer that plays the role of current conversion and electrical isolation. The bias resistors R10 and R11 in the detection circuit are used to convert the sampling signal into a differential signal; R9 is a sampling resistor, and the anti-aliasing filter of the current channel is composed of R7, R8, and C3, and the current input is filtered through C4, and finally a voltage signal that meets the requirements is obtained and sent to the chip CS5463 for real-time calculation. The chip CS5463 has a reference voltage of 5V, and C53, C54, and C33 are filter capacitors. The digital serial interface pins of the chip CS5463 must be isolated from the external digital interface to ensure that the reference ground potential of the measurement terminal and the external interface ground reference potential do not affect each other.

[0046] The voltage sampling circuit includes a resistor R122, a resistor R123, a resistor R124, and a first operational amplifier U110. The analog-to-digital conversion module is an analog-to-digital conversion chip U113. The current amplification circuit includes a resistor R128, a resistor R130, a resistor R131, a resistor R132, and a second operational amplifier U112. One end of the resistor R122 is connected to one end of the resistor R123, the other end of the resistor R123 is connected to the non-inverting input terminal of the first operational amplifier U110, the output terminal of the first operational amplifier U110 is connected to the CH1+ pin of the analog-to-digital conversion chip U113, one end of the resistor R131 is connected to the inverting input terminal of the second operational amplifier U112, one end of the resistor R128 is connected to the non-inverting input terminal of the second operational amplifier U112, one end of the resistor R130 is connected to the non-inverting input terminal of the second operational amplifier U112 and the other end is connected to AGND, both ends of the resistor R132 are respectively connected to the inverting input terminal and the output terminal of the second operational amplifier U112, and the output terminal of the second operational amplifier U112 is connected to the CH2+ pin of the analog-to-digital conversion chip U113.

[0047] Specifically, refer to Figure 6, the model number of the first operational amplifier is OP07CDR, the model number of the analog-to-digital conversion chip U2 is MCP3428, and the model number of the second operational amplifier U112 is OP07CDR; one end of the resistor R122 is connected to one end of the resistor R123, the other end of the resistor R123 is connected to pin 3 of the first operational amplifier U110, pin 6 of the first operational amplifier U110 is connected to pin 1 of the analog-to-digital conversion chip U2, one end of the resistor R131 is connected to pin 2 of the second operational amplifier U112, one end of the resistor R128 is connected to pin 3 of the second operational amplifier U112, one end of the resistor R130 is connected to pin 3 of the second operational amplifier U112 and the other end is connected to AGND, both ends of the resistor R132 are respectively connected to pin 2 and pin 6 of the second operational amplifier U112, and pin 6 of the second operational amplifier U112 is connected to pin 3 of the analog-to-digital conversion chip U2.

[0048] Specifically, since the voltage to be detected is very large and cannot be directly sampled by the analog-to-digital converter (MCP3428), the DC voltage needs to be collected. The DC voltage collection of the charging interface is obtained by the method of resistor voltage division, and the charging voltage at both ends of the power battery can be obtained by reverse derivation of the voltage division formula. The voltage collection of the analog-to-digital converter MCP3428 supports a differential input range of 2.048V. Through parameter calculation and analysis, it is obtained that the collected voltage needs to be reduced by about 50 times. And in order to improve the collection accuracy, all resistors use precision resistors with an accuracy of 0.1%. The signal that the operational amplifier can amplify is determined by the power supply rail. Generally, the operational amplifier will give a common-mode input range, which is determined by the positive and negative power supply ranges of the operational amplifier. Since the signal to be amplified is small, therefore, the power supply voltage for the operational amplifier is ±5V to ensure that the amplified signal can be covered by the common-mode input voltage range of the operational amplifier.

[0049] Specifically, refer to Figure 5 , the gain amplification resistors R122, R123, R124 and the first operational amplifier OP07CDR form a voltage divider circuit of a voltage follower, and the voltage gain of the amplification circuit is . C105 is a decoupling capacitor to filter out power supply interference. D26 is a clamping diode to protect the input signal of the circuit port within the power supply range. The DC current collection of the charging interface is obtained by the method of differential input. I- and I+ are differential signal input ports, and R131 and R128 are high-power current-limiting resistors. Refer to Figure 6 , the gain amplification resistors R128, R130, R131, R132 and the second operational amplifier OP07CDR form a differential amplifier, and the current gain of the amplification circuit is . Among them, C115 is a decoupling capacitor to filter out power supply interference. D29 is a clamping diode to protect the input signal of the circuit port within the power supply range. Refer toFigure 7 Since the microcontroller cannot directly read analog signals, an analog-to-digital converter is required. The MCP3428 is used as the analog-to-digital converter, which can perform A / D conversion on the collected current and voltage. It is powered by a 3.3V power supply. CH1, CH2, CH3, and CH4 are four differential input interfaces, and one end of the signal is grounded as the signal input reference. Data can be sent and received through the SDA data line and the SCL clock signal line of the microcontroller's IIC bus. R133 and R134 are pull-up resistors.

[0050] The SCLK pin of the power metering chip U2 is respectively connected to the IO15 pin of the main control chip U85 and the SCK pin of the storage chip U32. The SDO pin of the power metering chip U2 is respectively connected to the IO14 pin of the main control chip U85 and the SO pin of the storage chip U32. The CS# pin of the power metering chip U2 is connected to the IO4 pin of the main control chip U85. The MODE pin of the power metering chip U2 is connected to the IO37 pin of the main control chip U85. The E3# pin of the power metering chip U2 is connected to the IO48 pin of the main control chip U85. The RESET# pin of the power metering chip U2 is connected to the IO13 pin of the main control chip U85. The INT# pin of the power metering chip U2 is connected to the IO12 pin of the main control chip U85. The E1# pin of the power metering chip U2 is connected to the IO21 pin of the main control chip U85. The E2# pin of the power metering chip U2 is connected to the IO47 pin of the main control chip U85. The SDI pin of the power metering chip U2 is respectively connected to the IO2 pin of the main control chip U85 and the SI pin of the storage chip U32.

[0051] Specifically, pin 5 of the power metering chip U2 can be respectively connected to pin 8 of the main control chip U85 and pin 6 of the storage chip U85. Pin 6 of the power metering chip U2 is respectively connected to pin 22 of the main control chip U85 and pin 2 of the storage chip U85. Pin 7 of the power metering chip U2 is connected to pin 4 of the main control chip U85. Pin 8 of the power metering chip U2 is connected to pin 30 of the main control chip U85. Pin 18 of the power metering chip U2 is connected to pin 25 of the main control chip U85. Pin 19 of the power metering chip U2 is connected to pin 21 of the main control chip U85. Pin 20 of the power metering chip U2 is connected to pin 20 of the main control chip U85. Pin 21 of the power metering chip U2 is connected to pin 23 of the main control chip U85. Pin 22 of the power metering chip U2 is connected to pin 24 of the main control chip U85. Pin 23 of the power metering chip U2 is respectively connected to pin 38 of the main control chip U85 and pin 5 of the storage chip U85.

[0052] The ADR0 pin of the analog-to-digital conversion chip U113 is connected to the IO9 pin of the main control chip U85, and the ADR1 pin of the analog-to-digital conversion chip U113 is connected to the IO46 pin of the main control chip U85.

[0053] Specifically, pin 9 of the analog-to-digital conversion chip U2 can be connected to pin 17 of the main control chip U85, and pin 10 of the analog-to-digital conversion chip U2 is connected to pin 16 of the main control chip U85.

[0054] Specifically, this application uses ESP32 as the main control chip, integrates a WIFI module, can monitor the operating status of the charger through a host computer or a Web terminal, and realizes remote control. The DC power detection uses a precision operational amplifier OP07CDR and an analog-to-digital converter MCP3428 for ADC conversion, and the AC power detection uses a CS5463 power metering chip. ESP32 controls the relay to realize the on / off of the AC and DC voltage outputs, uses a DS18B20 temperature sensor to monitor the temperature during the charging process, and if the charging status is abnormal, the buzzer sounds an alarm and disconnects the relay to ensure safety during charging. The first communication unit integrates RS232 and RS485 communication protocols, providing a communication interface for subsequent external expansion. This system has comprehensive functions, is easy to use, safe and reliable, is suitable for the charging management of industrial electric vehicles, and provides an intelligent solution for the management and control of power vehicle chargers.

[0055] The content described above can be implemented alone or in various combinations, and these variant ways are all within the protection scope of the present utility model.

[0056] It should be noted that in the description of this application, the terms "upper end", "lower end", and "bottom end" indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of this application is usually placed during use. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to this application. Moreover, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including the element.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A charger management device, characterized in that: It includes a control unit, a remote monitoring unit, an AC detection unit, a DC detection unit, a first communication unit, and a power supply unit; the power supply unit is used to convert the AC voltage input by the mains power supply device into a corresponding DC voltage that can be used by the control unit, the AC detection unit, the DC detection unit, the monitoring alarm unit, and the external communication unit respectively; the AC detection unit is used to detect the AC power input into the charger in real time to obtain an AC detection signal; the DC detection unit is used to detect the DC power output by the charger in real time to obtain a DC detection signal; the control unit is respectively connected to the AC detection unit and the DC detection unit; the control unit is connected to the remote monitoring unit via the first communication unit.

2. A charger management device according to claim 1, characterized in that: It also includes a temperature detection circuit for detecting the real-time temperature of the charger, and an alarm circuit for alarming under the control of the control unit when the real-time temperature is greater than a preset temperature.

3. A charger management device according to claim 1 or 2, characterized in that: The power supply unit includes a switching power supply module, a low-pass filter module, and a voltage stabilizing module. The switching power supply module is used to convert the AC 220V voltage input by the mains power supply device into a digital DC 5V voltage. The low-pass filter module is used to convert the digital DC +5V voltage into an analog DC 5V voltage. The voltage stabilizing module can convert the digital DC 5V voltage into a digital DC 3.3V voltage. The voltage stabilizing module can convert the analog DC 5V voltage into an analog DC 3.3V voltage.

4. A charger management device according to claim 1 or 2, characterized in that: The control unit is a single chip microcomputer, which includes a main control chip U85 and a storage chip U32 for storing the working parameters of the motor.

5. A charger management device as claimed in claim 4, characterized in that: The AC detection unit includes a voltage mutual induction module, a current mutual induction module, a first signal processing module, and an electric energy metering module; the voltage mutual induction module is used to reduce the AC voltage input to the charger into a first voltage conversion signal, and the current mutual induction module is used to reduce the AC current input to the charger into a first current conversion signal. The first signal processing module includes a first differential filter circuit for converting the first voltage conversion signal into a first differential voltage signal and inputting it into the electric energy metering module, and a second differential filter circuit for converting the first current conversion signal into a second differential voltage signal and inputting it into the electric energy metering module. The electric energy metering module is used to calculate the first differential voltage signal and the second differential voltage signal to obtain corresponding AC detection signals.

6. A charger management device as claimed in claim 4, characterized in that: The DC detection unit includes a second signal processing module and an analog-to-digital conversion module; the second signal processing module includes a voltage sampling circuit for collecting the DC voltage output by the charger and reducing the DC voltage to obtain a second voltage conversion signal, and a current amplifying circuit for collecting the DC current output by the charger and amplifying the DC current to obtain a second current conversion signal. The analog-to-digital conversion module is used to perform analog-to-digital conversion on the second voltage conversion signal and the second current conversion signal respectively to obtain a corresponding DC detection signal.

7. A charger management device as claimed in claim 5, characterized in that: The voltage mutual induction module is a voltage mutual induction module L2, the current mutual induction module is a current mutual induction module U19, the first differential filter circuit includes a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C1, a capacitor C2, and a resistor R2, the second differential filter circuit includes a resistor R10, a resistor R11, a resistor R7, a resistor R8, a capacitor C3, a capacitor C4, and a resistor R9, the electric energy metering module is an electric energy metering chip U2, and the AC detection unit also includes a resistor R1 for current limiting; one end of the resistor R1 and one end of the voltage mutual induction module L2 are respectively connected to the input end of the charger, the other end of the resistor R1 is connected to the other end of the voltage mutual induction module L2, the resistor R2 and the capacitor C1 are both connected in parallel with the voltage mutual induction module L2, one end of the resistor R3 is connected to one end of the capacitor C1, and the other end is connected to AGND, one end of the resistor R4 is connected to the other end of the capacitor C1, and the other end is connected to AGND, one end of the resistor R5 is connected to the capacitor C1 and connected to AGND. One end of the resistor R3 is connected, and the other end is connected to the VIN+ pin of the electric energy metering chip U2. One end of the resistor R6 is connected to one end of the capacitor C1 connected to the resistor R4, and the other end is connected to the VIN- pin of the electric energy metering chip U2. Both ends of the capacitor C2 are connected to the other end of the resistor R5 and the other end of the resistor R6 respectively. The resistor R9 and the capacitor C4 are connected in parallel with the capacitor transformer U19. One end of the resistor R10 and one end of the resistor R11 are connected to the two ends of the capacitor C4 respectively. The other end of the resistor R10 and the other end of the resistor R11 are connected to AGND respectively. One end of the resistor R7 is connected to one end of the capacitor C4 connected to the resistor R10, and the other end is connected to the IIN+ pin of the electric energy metering chip U2. One end of the resistor R8 is connected to one end of the capacitor C4 connected to the resistor R11, and the other end is connected to the IIN- pin of the electric energy metering chip U2. Both ends of the capacitor C3 are connected to the other end of the resistor R7 and the other end of the resistor R8 respectively.

8. A charger management device as claimed in claim 6, characterized in that: The voltage sampling circuit includes a resistor R122, a resistor R123, a resistor R124, and a first operational amplifier U110. The analog-to-digital conversion module is an analog-to-digital conversion chip U113. The current amplification circuit includes a resistor R128, a resistor R130, a resistor R131, a resistor R132, and a second operational amplifier U112. One end of the resistor R122 is connected to one end of the resistor R123, and the other end of the resistor R123 is connected to the same-direction input end of the first operational amplifier U110. The output end of the first operational amplifier U110 is connected to the analog-to-digital conversion chip U113. The analog-to-digital conversion chip U113 is connected to the CH1+ pin of the analog-to-digital conversion chip U113, one end of the resistor R131 is connected to the inverting input terminal of the second operational amplifier U112, one end of the resistor R128 is connected to the non-inverting input terminal of the second operational amplifier U112, one end of the resistor R130 is connected to the non-inverting input terminal of the second operational amplifier U112, and the other end is connected to AGND, two ends of the resistor R132 are respectively connected to the inverting input terminal and the output terminal of the second operational amplifier U112, and the output terminal of the second operational amplifier U112 is connected to the CH2+ pin of the analog-to-digital conversion chip U113.

9. A charger management device as claimed in claim 7, characterized in that: The SCLK pin of the electric energy metering chip U2 is respectively connected to the IO15 pin of the main control chip U85 and the SCK pin of the storage chip U32, the SDO pin of the electric energy metering chip U2 is respectively connected to the IO14 pin of the main control chip U85 and the SO pin of the storage chip U32, the CS# pin of the electric energy metering chip U2 is connected to the IO4 pin of the main control chip U85, the MODE pin of the electric energy metering chip U2 is connected to the IO37 pin of the main control chip U85, the E3# pin of the electric energy metering chip U2 is connected to the IO48 pin, the RESET# pin of the electric energy metering chip U2 is connected to the IO13 pin of the main control chip U85, the INT# pin of the electric energy metering chip U2 is connected to the IO12 pin of the main control chip U85, the E1# pin of the electric energy metering chip U2 is connected to the IO21 pin of the main control chip U85, the E2# pin of the electric energy metering chip U2 is connected to the IO47 pin of the main control chip U85, and the SDI pin of the electric energy metering chip U2 is respectively connected to the IO2 pin of the main control chip U85 and the SI pin of the storage chip U32.

10. A charger management device as claimed in claim 8, characterized in that: The ADR0 pin of the analog-to-digital conversion chip U113 is connected to the IO9 pin of the main control chip U85, and the ADR1 pin of the analog-to-digital conversion chip U113 is connected to the IO46 pin of the main control chip U85.

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