Charging detection system and power supply equipment

Abstract

The utility model discloses a charging detection system and power supply equipment. The charging detection system comprises a central control module and a data acquisition module. The data acquisition module is connected with the central control module; the data acquisition module at least comprises a short circuit detection circuit, the short circuit detection circuit is used for detecting any two lines of an L line, an N line and a PE line of the power supply equipment and sending a detection result to the central control module, and the central control module is used for judging whether the any two lines of the L line, the N line and the PE line of the power supply equipment are short-circuited or not according to the detection result. By arranging the short circuit detection circuit, short circuit detection can be carried out on the power supply equipment, line abnormity of the power supply equipment is avoided, and charging safety is improved.

Description

Technical Field

[0001] The utility model generally relates to the technical field of vehicle charging, and more particularly to a charging detection system and a power supply device. Background Art

[0002] With the rapid development of society, people's living standards have been continuously improved. More people choose to use electric vehicles for travel. When an electric vehicle is charged, it is necessary to first detect the power supply device, such as detecting a charging pile or a household charging device, to prevent potential safety hazards. However, the detection functions of the currently used detection devices are limited, and it is difficult to ensure charging safety.

[0003] Therefore, it is necessary to provide a charging detection system and a power supply device to at least partially solve the above problems. Summary of the Utility Model

[0004] A series of simplified concepts are introduced in the summary of the utility model, which will be further elaborated in the detailed implementation section. The summary of the utility model does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the protection scope of the claimed technical solution.

[0005] To at least partially solve the above problems, a first aspect of the utility model provides a charging detection system, including:

[0006] A central control module;

[0007] A data acquisition module, the data acquisition module is connected to the central control module;

[0008] Wherein, the data acquisition module at least includes a short-circuit detection circuit, the short-circuit detection circuit is used to detect any two lines of the L line, N line and PE line of the power supply device, and send the detection result to the central control module, and the central control module is used to judge whether any two lines of the L line, N line and PE line of the power supply device have a short circuit according to the detection result.

[0009] Optionally, the short-circuit detection circuit includes:

[0010] A relay RL1, the relay RL1 includes a Lin terminal, a Nin terminal, a signal input terminal, a signal output terminal, an electromagnet positive terminal and an electromagnet negative terminal;

[0011] The Lin terminal is used to connect the L line or N line of the power supply device, the Nin terminal is used to connect the N line or PE line of the power supply device, the signal input terminal is used to input a detection voltage, and the signal output terminal is used to output a detection voltage;

[0012] When the relay RL1 is closed, the signal input terminal is connected to the Lin terminal, and the signal output terminal is connected to the Nin terminal; when the relay RL1 is open, the signal input terminal is disconnected from the Lin terminal, and the signal output terminal is disconnected from the Nin terminal;

[0013] The positive terminal of the electromagnet is connected to the driving power supply.

[0014] Optionally, the short - circuit detection circuit further includes:

[0015] A field - effect transistor Q1, the gate of the field - effect transistor Q1 is connected to the central control module, the source is grounded, and the drain is connected to the negative terminal of the electromagnet of the relay RL1;

[0016] The central control module is further configured to send an enabling signal to the gate of the field - effect transistor Q1. When the field - effect transistor Q1 receives the enabling signal, the field - effect transistor Q1 conducts, and the electromagnet of the relay RL1 is energized to make the relay RL1 closed.

[0017] Optionally, the short - circuit detection circuit further includes:

[0018] An optocoupler IC1, the optocoupler IC1 includes a signal input terminal and a signal output terminal. The signal input terminal of the optocoupler IC1 is connected to the signal output terminal of the relay RL1, and the signal output terminal of the optocoupler IC1 is connected to the central control module. The optocoupler IC1 is used to convert the detection voltage into a detection signal and send it to the central control module.

[0019] Optionally, the data acquisition module further includes:

[0020] A wiring detection circuit, which is used to detect the L - line, N - line and PE - line of the power supply device and send the detection result to the central control module. The central control module is used to judge the connection status of the L - line, N - line and PE - line of the power supply device according to the detection result.

[0021] Optionally, the wiring detection circuit includes:

[0022] Lin terminal, Nin terminal and PE terminal; [[ID=I32]]

[0023] An optocoupler IC6, the optocoupler IC6 includes a signal input terminal and a signal output terminal. The signal input terminals of the optocoupler IC6 are respectively connected to the Lin terminal and the Nin terminal, and the signal output terminal of the optocoupler IC6 is connected to the central control module, and is used to send the detection signal to the central control module;

[0024] Opto - coupler IC7, the opto - coupler IC7 includes a signal input terminal and a signal output terminal. The signal input terminal of the opto - coupler IC7 is respectively connected to the Lin terminal and the PE terminal, and the signal output terminal of the opto - coupler IC7 is connected to the central control module for sending a detection signal to the central control module;

[0025] Opto - coupler IC8, the opto - coupler IC8 includes a signal input terminal and a signal output terminal. The signal input terminal of the opto - coupler IC8 is respectively connected to the Nin terminal and the PE terminal, and the signal output terminal of the opto - coupler IC8 is connected to the central control module for sending a detection signal to the central control module.

[0026] Optionally, the data acquisition module further includes:

[0027] CC detection circuit, the CC detection circuit is used to detect the CC line of the power supply device and send the detection result to the central control module, and the central control module is used to judge the state of the CC line of the power supply device according to the detection result.

[0028] Optionally, the CC detection circuit includes:

[0029] Relay RLY6, the relay RLY6 includes a signal input terminal, a signal output terminal, an electromagnet positive terminal, and an electromagnet negative terminal;

[0030] The signal output terminal is used to connect to the CC line, and the signal input terminal is used to input and output a detection voltage;

[0031] When the relay RLY6 is closed, the signal input terminal is connected to the signal output terminal. When the relay RLY6 is open, the signal input terminal is disconnected from the signal output terminal;

[0032] The electromagnet positive terminal is connected to a driving power supply.

[0033] Optionally, the CC detection circuit further includes:

[0034] Field - effect transistor D20, the gate of the field - effect transistor D20 is connected to the central control module, the source is grounded, and the drain is connected to the electromagnet negative terminal of the relay RLY6;

[0035] The central control module is further used to send an enable signal to the gate of the field - effect transistor D20. When the field - effect transistor D20 receives the enable signal, the field - effect transistor D20 conducts, and the electromagnet of the relay RLY6 is energized to make the relay RLY6 closed.

[0036] Optionally, the CC detection circuit further includes:

[0037] A voltage follower, the non-inverting input terminal of the voltage follower is connected to the signal input terminal of the relay RLY6, and the output terminal of the voltage follower is connected to the central control module.

[0038] Optionally, the data acquisition module further includes:

[0039] A CP detection circuit, which is used to detect the CP line of the power supply device and send the detection result to the central control module, and the central control module is used to judge the state of the CP line of the power supply device according to the detection result.

[0040] Optionally, the CP detection circuit includes:

[0041] A comparator, the non-inverting input terminal of the comparator is used to connect to the CP line, and the inverting input terminal of the comparator is connected to a comparison voltage;

[0042] A field effect transistor D22, the gate of the field effect transistor D22 is connected to the output terminal of the comparator, the source is grounded, and the drain is connected to the central control module;

[0043] The comparator is used to compare the comparison voltage with the voltage-dividing signal of the CP line and output a comparison signal with a predetermined frequency and a predetermined duty cycle. The comparison signal drives the field effect transistor D22 to conduct or turn off to form a detection signal, and the detection signal is output to the central control module.

[0044] Optionally, the charging detection system further includes:

[0045] A protection module, which is used to detect the voltage between any two of the L line, N line and PE line of the power supply device and send the detection result to the central control module, and the central control module is used to judge whether the leakage protection function of the power supply device is normal according to the detection result.

[0046] Optionally, the protection module includes:

[0047] A comparator, the non-inverting input terminal of the comparator is used to connect to the L line, N line or PE line of the power supply device, the inverting input terminal of the comparator is used to connect to the N line or PE line of the power supply device, and the output terminal of the comparator is connected to the central control module;

[0048] The comparator is used to compare the voltage of the L line with the voltage of the N line, the voltage of the L line with the voltage of the PE line, or the voltage of the N line with the voltage of the PE line, and output a comparison signal, and the comparison signal is output to the central control module.

[0049] Optionally, three sets of protection modules are provided, which are respectively used to detect the voltages between the L line and the N line, the L line and the PE line, and the N line and the PE line of the power supply device.

[0050] Optionally, the charging detection system further includes:

[0051] A display module, which is connected to the central control module and is used to display the judgment result of the central control module.

[0052] Optionally, the charging detection system further includes:

[0053] A communication module, which is connected to the central control module and is used to communicate with the outside world.

[0054] Optionally, the charging detection system further includes:

[0055] A power supply module, which is used to supply power to the central control module and the data acquisition module.

[0056] Optionally, the power supply module includes:

[0057] A USB power supply circuit, which is provided with a USB interface;

[0058] A battery circuit, which is provided with a battery, and the battery circuit is connected in parallel with the USB power supply circuit;

[0059] A power switch, the USB power supply circuit and the battery circuit are respectively connected to the power switch, and the central control module and the data acquisition module are powered through the power switch;

[0060] When an external power supply is connected to the USB power supply circuit, the battery circuit is open-circuited with the power switch.

[0061] The second aspect of the present invention provides a power supply device, including the charging detection system according to any one of the above technical solutions.

[0062] According to a charging detection system and a power supply device of the present invention, the charging detection system can perform short-circuit detection on the power supply device by setting a short-circuit detection circuit, detect whether there is a short circuit between any two of the L line, N line and PE line of the power supply device, avoid abnormal lines of the power supply device, and only after ensuring the normal function of the power supply device can the vehicle be charged, thereby improving the charging safety. Description of the Drawings

[0063] The following drawings of the embodiments of the present invention are hereby incorporated as part of the present invention for understanding the present invention. The embodiments and descriptions thereof shown in the drawings are used to explain the principles of the present invention. In the drawings,

[0064] Figure 1 It is a structural block diagram of a charging detection system according to a preferred embodiment of the present utility model;

[0065] Figure 2 It is a structural block diagram of a data acquisition module according to a preferred embodiment of the present utility model;

[0066] Figure 3 It is a circuit diagram of a short - circuit detection circuit according to a preferred embodiment of the present utility model;

[0067] Figure 4 It is a circuit diagram of a wiring detection circuit according to a preferred embodiment of the present utility model;

[0068] Figure 5 It is a circuit diagram of a CC detection circuit according to a preferred embodiment of the present utility model;

[0069] Figure 6 It is a circuit diagram of a CP detection circuit according to a preferred embodiment of the present utility model;

[0070] Figure 7 It is a circuit diagram of a protection module according to a preferred embodiment of the present utility model;

[0071] Figure 8 It is a circuit diagram of a power supply module according to a preferred embodiment of the present utility model;

[0072] Figure 9 It is a working flow chart of a charging detection system according to a preferred embodiment of the present utility model. Specific embodiments

[0073] In the following description, a large number of specific details are given to provide a more thorough understanding of the present utility model. However, it is obvious to those skilled in the art that the present utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present utility model, some well - known technical features in the art are not described.

[0074] In order to thoroughly understand the present utility model, a detailed description will be presented in the following. It should be understood that these embodiments are provided to make the disclosure of the present utility model complete and thorough, and to fully convey the concept of these exemplary embodiments to those of ordinary skill in the art. Obviously, the implementation of the embodiments of the present utility model is not limited to the special details familiar to those skilled in the art. The preferred embodiments of the present utility model are described in detail below. However, in addition to these detailed descriptions, the present utility model can also have other embodiments.

[0075] In the present utility model, ordinal numbers such as "first" and "second" are merely identifiers and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" does not imply the existence of a "second component" by itself, and the term "second component" does not imply the existence of a "first component" by itself.

[0076] It should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer" and similar expressions used in the present utility model are only for illustrative purposes and are not restrictive.

[0077] The present utility model discloses a charging detection system and a power supply device.

[0078] Now, exemplary embodiments according to the present utility model will be described in more detail with reference to the accompanying drawings.

[0079] As Figure 1 、 Figure 2 shown, in a preferred embodiment, a charging detection system includes: a central control module and a data acquisition module;

[0080] The data acquisition module is connected to the central control module;

[0081] The data acquisition module at least includes a short - circuit detection circuit, which is used to detect any two of the L - line, N - line and PE - line of the power supply device, and send the detection result to the central control module. The central control module is used to judge whether there is a short - circuit between any two of the L - line, N - line and PE - line of the power supply device according to the detection result.

[0082] The power supply device is a charging pile or a household charging device, and the central control module can be an MCU.

[0083] In the charging detection system of this embodiment, by setting up a short - circuit detection circuit, the power supply device can be subjected to short - circuit detection to detect whether there is a short - circuit between any two of the L - line, N - line and PE - line of the power supply device, avoiding abnormal lines of the power supply device. After ensuring that the functions of the power supply device are normal, the vehicle can be charged, thereby improving the charging safety.

[0084] In one embodiment, as Figure 3 shown, the short - circuit detection circuit includes:

[0085] A relay RL1, which includes a Lin terminal, a Nin terminal, a signal input terminal, a signal output terminal, an electromagnet positive terminal and an electromagnet negative terminal;

[0086] The Lin terminal is used to connect the L - line or N - line of the power supply device, the Nin terminal is used to connect the N - line or PE - line of the power supply device, the signal input terminal is used to input a detection voltage, and the signal output terminal is used to output a detection voltage;

[0087] When the relay RL1 is closed, the signal input terminal is connected to the Lin terminal, and the signal output terminal is connected to the Nin terminal. When the relay RL1 is open, the signal input terminal is disconnected from the Lin terminal, and the signal output terminal is disconnected from the Nin terminal;

[0088] The positive terminal of the electromagnet is connected to the driving power supply.

[0089] In one embodiment, as Figure 3 shown, the short - circuit detection circuit further includes:

[0090] A field - effect transistor Q1, the gate of the field - effect transistor Q1 is connected to the central control module, the source is grounded, and the drain is connected to the negative terminal of the electromagnet of the relay RL1;

[0091] The central control module is further configured to send an enabling signal to the gate of the field - effect transistor Q1. When the field - effect transistor Q1 receives the enabling signal, the field - effect transistor Q1 is turned on, the electromagnet of the relay RL1 is energized to make the relay RL1 closed, and the detection voltage is output from the signal output terminal.

[0092] In one embodiment, as Figure 3 shown, the short - circuit detection circuit further includes:

[0093] An optocoupler IC1, the optocoupler IC1 includes a signal input terminal and a signal output terminal. The signal input terminal of the optocoupler IC1 is connected to the signal output terminal of the relay RL1, and the signal output terminal of the optocoupler IC1 is connected to the central control module. The optocoupler IC1 converts the detection voltage into a detection signal and sends it to the central control module.

[0094] As Figure 3 shown, the short - circuit detection function needs to be completed before the power supply device is powered on. The short - circuit detection principle is as follows:

[0095] When the system enters the short - circuit function detection, the MCU will send out the LN_MCU signal, the VCC2 power supply is turned on, making the field - effect transistor Q1 turned on, and then the relay RL1 is turned on. VCC1 passes through the diode D1, the Lin terminal, the Nin terminal and is connected to the resistor R3 and the optocoupler IC1 to form a loop, making the primary side of the optocoupler IC1 turned on, and then the secondary side is turned on. The 3.3V voltage on the secondary side is pulled low, and the LN_short_MCU is pulled low. At this time, the voltage at the receiving end of the MCU changes from 3.3V to 0V, and the system will alarm for LN short - circuit.

[0096] Similarly, the L / PE short - circuit and N / PE short - circuit can also be realized by the above - mentioned circuit.

[0097] In one embodiment, as Figure 1 、 Figure 2 shown, the data acquisition module further includes:

[0098] Wiring detection circuit, which is used to detect the L wire, N wire and PE wire of the power supply device and send the detection results to the central control module. The central control module judges the connection status of the L wire, N wire and PE wire of the power supply device according to the detection results.

[0099] In one embodiment, as Figure 4 shown, the wiring detection circuit includes:

[0100] Lin terminal, Nin terminal and PE terminal;

[0101] Optocoupler IC6, which includes a signal input terminal and a signal output terminal. The signal input terminals of the optocoupler IC6 are respectively connected to the Lin terminal and the Nin terminal, and the signal output terminal of the optocoupler IC6 is connected to the central control module for sending the detection signal to the central control module;

[0102] Optocoupler IC7, which includes a signal input terminal and a signal output terminal. The signal input terminals of the optocoupler IC7 are respectively connected to the Lin terminal and the PE terminal, and the signal output terminal of the optocoupler IC7 is connected to the central control module for sending the detection signal to the central control module;

[0103] Optocoupler IC8, which includes a signal input terminal and a signal output terminal. The signal input terminals of the optocoupler IC8 are respectively connected to the Nin terminal and the PE terminal, and the signal output terminal of the optocoupler IC8 is connected to the central control module for sending the detection signal to the central control module.

[0104] As Figure 4 shown, the wiring detection principle is as follows:

[0105] When the Lin terminal, Nin terminal and PE terminal are connected to the power supply device, at this time, different wiring states will cause different conduction states of the optocoupler, so the signals of AC_1, AC_2, and AC_3 will change accordingly. These signals will be sent to the MCU for processing, and different wiring states will be judged according to different combined voltages.

[0106] For example, when the live wire is missing, the optocouplers IC6, IC7, and IC8 are not conducting, and the signals of AC_1, AC_2, and AC_3 are all high levels. At this time, the system determines that the live wire is missing, and the display shows the live wire missing fault; when the neutral wire is missing, the optocouplers IC6 and IC8 are not conducting, the signals of AC_1 and AC_2 are both high levels, IC7 is conducting, and AC_3 is low level. At this time, the system determines that the neutral wire is missing, and the display shows the neutral wire missing fault;

[0107] Various fault types can be represented by different truth tables. The specific fault truth table is as follows (1 represents high level, 0 represents low level):

[0108]

[0109] In one embodiment, asFigure 1 , Figure 2 As shown, the data acquisition module further includes:

[0110] A CC detection circuit, which is used to detect the CC line of the power supply device and send the detection result to the central control module. The central control module is used to judge the state of the CC line of the power supply device according to the detection result.

[0111] In one embodiment, as Figure 5 shown, the CC detection circuit includes:

[0112] Relay RLY6, which includes a signal input terminal, a signal output terminal, an electromagnet positive terminal, and an electromagnet negative terminal;

[0113] The signal output terminal is used to connect to the CC line, and the signal input terminal is used to input and output the detection voltage;

[0114] When relay RLY6 is closed, the signal input terminal is connected to the signal output terminal. When relay RLY6 is open, the signal input terminal is disconnected from the signal output terminal;

[0115] The electromagnet positive terminal is connected to the driving power supply.

[0116] In one embodiment, as Figure 5 shown, the CC detection circuit further includes:

[0117] Field effect transistor D20, the gate of field effect transistor D20 is connected to the central control module, the source is grounded, and the drain is connected to the electromagnet negative terminal of relay RLY6;

[0118] The central control module is further used to send an enable signal to the gate of field effect transistor D20. When field effect transistor D20 receives the enable signal, field effect transistor D20 conducts, the electromagnet of relay RLY6 is energized to make relay RLY6 closed, and the signal input terminal outputs the detection voltage.

[0119] In one embodiment, as Figure 5 shown, the CC detection circuit further includes:

[0120] Voltage follower U9B, the non-inverting input terminal of voltage follower U9B is connected to the signal input terminal of relay RLY6, and the output terminal of voltage follower U9B is connected to the central control module.

[0121] As Figure 5 shown, the CC detection principle is as follows:

[0122] When detecting the CC signal, the MCU will send a CC_on signal, which is at a high level. At this time, the field-effect transistor D20 conducts, and the relay RLY6 conducts, thereby connecting the NET_CC to the CC signal of the power supply device. By dividing the voltage of VCC2, the NET_CC_test voltage can be obtained. This voltage is divided by the voltage follower U9B, resistor R23, and resistor R24 to form a CC_AD signal, which is sent to the MCU for judging whether the CC line connection is normal.

[0123] In one embodiment, as Figure 1 、 Figure 2 shown, the data acquisition module further includes:

[0124] A CP detection circuit for detecting the CP line of the power supply device and sending the detection result to the central control module, and the central control module is used to judge the state of the CP line of the power supply device according to the detection result.

[0125] In one embodiment, as Figure 6 shown, the CP detection circuit includes:

[0126] Comparator U8B, the non-inverting input terminal of the comparator U8B is used to connect to the CP line, and the inverting input terminal of the comparator U8B is connected to the comparison voltage;

[0127] Field-effect transistor D22, the gate of the field-effect transistor D22 is connected to the output terminal of the comparator U8B, the source is grounded, and the drain is connected to the central control module;

[0128] Comparator U8B is used to compare the comparison voltage with the divided voltage signal of the CP line and output a comparison signal with a predetermined frequency and a predetermined duty cycle. The comparison signal drives the field-effect transistor D22 to conduct or turn off to form a detection signal, and the detection signal is output to the central control module.

[0129] As Figure 6 shown, the CP detection principle is as follows:

[0130] When the system is connected to the power supply device, the fixed 1K resistor of the power supply device and resistor R27 are used for voltage division and connected to comparator pin5. According to national standards, when the CP signal is voltage-divided and less than 9V, a square wave signal with a frequency of 1KHz and a duty cycle of 8% - 90% will be formed. Therefore, the signal at pin5 is a square wave signal with a frequency of 1KHz and a duty cycle of 8% - 90%; the voltage at pin6 is obtained by voltage division of VCC1 through resistor R28 and resistor R29. The signals at pin5 and pin6 are compared by the comparator, and the output is a square wave signal with a frequency of 1KHz and a duty cycle of 8% - 90%. When the output is at a high level, the field effect transistor D22 conducts, and the 3.3V voltage is pulled down, and PWM-Test0 is at a low level. When the output is at a low level, the field effect transistor D22 does not conduct, and PWM-Test0 is at a high level. At this time, the logic is inverse logic. Therefore, the PWM-Test0 signal is a square wave signal with an amplitude of 3.3V, a frequency of 1KHz, and a duty cycle of 10% - 92%.

[0131] In one embodiment, as Figure 1 、 Figure 2 shown, the charging detection system further includes:

[0132] A protection module, which is used to detect the voltage between any two of the L line, N line, and PE line of the power supply device, and send the detection result to the central control module. The central control module is used to judge whether the leakage protection function of the power supply device is normal according to the detection result.

[0133] In one embodiment, as Figure 7 shown, the protection module includes:

[0134] A comparator, the non-inverting input terminal of the comparator is used to connect to the L line, N line, or PE line of the power supply device, the inverting input terminal of the comparator is used to connect to the N line or PE line of the power supply device, and the output terminal of the comparator is connected to the central control module;

[0135] The comparator is used to compare the voltage of the L line with the voltage of the N line, the voltage of the L line with the voltage of the PE line, or the voltage of the N line with the voltage of the PE line, and output a comparison signal, and the comparison signal is output to the central control module.

[0136] As Figure 7 shown, the leakage detection principle is as follows:

[0137] The voltages of L-N, L-PE, and N-PE are detected respectively, and the output signals are L_N_AD, L_PE_AD, and N_PE_AD respectively. These signals will be sent to the MCU for processing. When performing leakage protection, the MCU will judge whether the leakage protection function is normal according to the sampled voltage values of the three.

[0138] In one embodiment, three protection modules are provided, which are respectively used to detect the voltages between the L line and the N line, the L line and the PE line, and the N line and the PE line of the power supply device.

[0139] In one embodiment, as Figure 1 shown, the charging detection system further includes:

[0140] A display module, which is connected to the central control module and is used to display the judgment result of the central control module. The display module can adopt a liquid crystal display.

[0141] In one embodiment, as Figure 1 shown, the charging detection system further includes:

[0142] A communication module, which is connected to the central control module and is used to communicate with the outside world. The communication module can adopt a WIFI module, a Bluetooth module or a 5G module.

[0143] In one embodiment, as Figure 1 shown, the charging detection system further includes:

[0144] A power supply module, which is used to supply power to the central control module and the data acquisition module.

[0145] In one embodiment, as Figure 8 shown, the power supply module includes:

[0146] A USB power supply circuit, which is provided with a USB interface;

[0147] A battery circuit, which is provided with a battery, and the battery circuit is connected in parallel with the USB power supply circuit;

[0148] A power switch, the USB power supply circuit and the battery circuit are respectively connected to the power switch, and the central control module and the data acquisition module are supplied with power through the power switch;

[0149] When the USB power supply circuit is externally powered, the battery circuit is disconnected from the power switch.

[0150] As Figure 8 shown, this system adopts two power supply methods. One is TYPE-C of USB (default 5V voltage), and the other is to adopt a battery (6V voltage). When the two power supply methods exist at the same time, according to the circuit design, the field effect transistor Q5 conducts, VBAT is pulled to ground, then the field effect transistors Q3 and Q4 do not conduct, so the USB will supply power preferentially.

[0151] An embodiment of the present utility model further provides a power supply device, which includes the charging detection system described in any one of the above embodiments.

[0152] An embodiment of the present utility model further provides a vehicle, including the charging detection system described in any one of the above embodiments.

[0153] As Figure 9 shown, the working process of the charging detection system is as follows:

[0154] 1. Function start

[0155] 2. First, detect the battery voltage and USB voltage. If the battery voltage is lower than 4.2V, the display shows that the battery voltage is low, and the system cannot perform the next detection and ends.

[0156] 3. After the battery voltage and USB voltage are detected, if there is no AC power supply, short-circuit detection of LN, LPE, and NPE will be performed. If there is a short circuit, the display shows fire-neutral short-circuit fault, fire-ground short-circuit fault, and zero-ground short-circuit fault.

[0157] 4. If there is AC power supply, press the switch S1 to perform wiring detection. The MCU will detect the voltage values of AC_1, AC_2, and AC_3. According to the voltages of AC_1, AC_2, and AC_3 received by the MCU and the truth table, it is judged whether the system wiring is abnormal. If the wiring is abnormal, the display screen shows an abnormal fault, such as a missing live wire fault or a missing zero

[0158] 5. After the wiring function is correct, the CC signal will be detected. According to the CC signal received by the MCU, it is judged whether the CC is normally connected. If it is abnormal, the display shows that the CC connection is abnormal (CC short-circuit fault / CC half-connection fault). If it is normal, the display shows that the CC connection is normal

[0159] 6. After the CC connection is normal, the CP signal is detected. According to the CP signal received by the MCU, it is judged whether the CP is normally connected. If it is abnormal, the display will directly skip the CP detection and perform the next leakage detection; if it is normal, the display will show that the pile function is normal

[0160] 7. After the pile function is normal, the leakage protection function is detected. According to the voltage sampled by the MCU, it is judged whether the leakage protection is normal. If it is abnormal, the display shows that the leakage protection function is abnormal. If it is normal, the display shows that the leakage protection function is normal.

[0161] 8. End

[0162] A charging detection system and a power supply device of the present utility model have the following characteristics:

[0163] The utility model comprehensively detects the safety functions of power supply equipment (charging piles or household charging devices) before charging. Only after ensuring that the functions of the power supply equipment are normal can charging be carried out. The main detection functions include short-circuit detection, wiring detection, leakage protection detection, and CC / CP detection. The detection objects are relatively comprehensive, rather than only detecting a certain line.

[0164] The utility model has comprehensive detection, small volume, easy to carry, strong practicability, and high safety. The charging piles or household charging devices on the current market can all be detected by the utility model, greatly improving the compatibility and applicability.

[0165] The processes and steps described in all the above preferred embodiments are only examples. Unless adverse effects occur, various processing operations can be carried out in an order different from the order of the above processes. The order of the steps of the above processes can also be increased, combined or deleted according to actual needs.

[0166] When understanding the scope of the present utility model, the term "comprising" and its derivatives as used herein are intended to be open-ended terms that specify the presence of the recited features, elements, components, groups, wholes, and / or steps, but do not exclude the presence of other unrecited features, elements, components, groups, wholes, and / or steps. This concept also applies to words with similar meanings, such as the terms "including", "having" and their derivatives.

[0167] The term "attached" or "attachment" used herein includes: a configuration in which an element is directly fixed to another element by directly fixing the element to the other element; a configuration in which an element is indirectly fixed to another element by fixing the element to an intermediate member, and the intermediate member is in turn fixed to the other element; and a configuration in which one element is integral with another element, that is, one element is substantially a part of the other element. This definition also applies to words with similar meanings, such as "connected", "coupled", "joined", "mounted", "adhered", "fixed" and their derivatives. Finally, degree terms such as "substantially", "about" and "approximate" used herein represent the amount of deviation that modifies the term so that the final result will not change significantly.

[0168] Unless otherwise defined, the technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the technical field of the present utility model. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The features described in one embodiment herein can be applied alone or in combination with other features to another embodiment, unless the feature is not applicable or otherwise stated in that other embodiment.

[0169] The present utility model has been described through the above embodiments. However, it should be understood that the above embodiments are only for illustrative and explanatory purposes, and are not intended to limit the present utility model within the scope of the described embodiments. In addition, those skilled in the art can understand that the present utility model is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the present utility model, and these variations and modifications all fall within the scope of protection required by the present utility model.

Claims

1. A charging detection system, characterized in that, Including: Central control module; Data acquisition module, the data acquisition module is connected to the central control module; Wherein, the data acquisition module at least includes a short-circuit detection circuit, the short-circuit detection circuit is used to detect any two lines of the L line, N line and PE line of the power supply device, and send the detection result to the central control module, and the central control module is used to judge whether there is a short circuit in any two lines of the L line, N line and PE line of the power supply device according to the detection result.

2. The charging detection system according to claim 1, wherein The short-circuit detection circuit includes: Relay RL1, the relay RL1 includes a Lin terminal, a Nin terminal, a signal input terminal, a signal output terminal, an electromagnet positive terminal and an electromagnet negative terminal; The Lin terminal is used to connect the L line or N line of the power supply device, the Nin terminal is used to connect the N line or PE line of the power supply device, the signal input terminal is used to input a detection voltage, and the signal output terminal is used to output a detection voltage; When the relay RL1 is closed, the signal input terminal is connected to the Lin terminal, and the signal output terminal is connected to the Nin terminal; when the relay RL1 is opened, the signal input terminal is disconnected from the Lin terminal, and the signal output terminal is disconnected from the Nin terminal; The positive terminal of the electromagnet is connected to the driving power supply.

3. The charging detection system according to claim 2, wherein, The short-circuit detection circuit further includes: Field effect transistor Q1, the gate of the field effect transistor Q1 is connected to the central control module, the source is grounded, and the drain is connected to the electromagnet negative terminal of the relay RL1; The central control module is further used to send an enable signal to the gate of the field effect transistor Q1. When the field effect transistor Q1 receives the enable signal, the field effect transistor Q1 conducts, and the electromagnet of the relay RL1 is energized to make the relay RL1 closed.

4. The charging detection system according to claim 3, wherein The short-circuit detection circuit further includes: Optocoupler IC1, the optocoupler IC1 includes a signal input terminal and a signal output terminal, the signal input terminal of the optocoupler IC1 is connected to the signal output terminal of the relay RL1, the signal output terminal of the optocoupler IC1 is connected to the central control module, and the optocoupler IC1 is used to convert the detection voltage into a detection signal and send it to the central control module.

5. The charging detection system according to claim 1, wherein The data acquisition module further includes: Wiring detection circuit, the wiring detection circuit is used to detect the L line, N line and PE line of the power supply device, and send the detection result to the central control module, and the central control module is used to judge the connection state of the L line, N line and PE line of the power supply device according to the detection result.

6. The charging detection system according to claim 5, wherein The wiring detection circuit includes: Lin terminal, Nin terminal and PE terminal; Optocoupler IC6, the optocoupler IC6 includes a signal input terminal and a signal output terminal, the signal input terminals of the optocoupler IC6 are respectively connected to the Lin terminal and the Nin terminal, and the signal output terminal of the optocoupler IC6 is connected to the central control module, and is used to send the detection signal to the central control module; Optocoupler IC7, the optocoupler IC7 includes a signal input terminal and a signal output terminal, the signal input terminals of the optocoupler IC7 are respectively connected to the Lin terminal and the PE terminal, and the signal output terminal of the optocoupler IC7 is connected to the central control module, and is used to send the detection signal to the central control module; Optocoupler IC8, the optocoupler IC8 includes a signal input terminal and a signal output terminal. The signal input terminal of the optocoupler IC8 is respectively connected to the Nin terminal and the PE terminal, and the signal output terminal of the optocoupler IC8 is connected to the central control module for sending the detection signal to the central control module.

7. The charging detection system according to claim 1, wherein, The data acquisition module further includes: A CC detection circuit, the CC detection circuit is used to detect the CC line of the power supply device and send the detection result to the central control module, and the central control module is used to judge the state of the CC line of the power supply device according to the detection result.

8. The charging detection system according to claim 7, wherein, The CC detection circuit includes: Relay RLY6, the relay RLY6 includes a signal input terminal, a signal output terminal, an electromagnet positive terminal, and an electromagnet negative terminal; The signal output terminal is used to connect to the CC line, and the signal input terminal is used to input and output the detection voltage; When the relay RLY6 is closed, the signal input terminal is connected to the signal output terminal. When the relay RLY6 is opened, the signal input terminal is disconnected from the signal output terminal; The electromagnet positive terminal is connected to the drive power supply.

9. The charging detection system according to claim 8, wherein The CC detection circuit further includes: Field effect transistor D20, the gate of the field effect transistor D20 is connected to the central control module, the source is grounded, and the drain is connected to the electromagnet negative terminal of the relay RLY6; The central control module is further used to send an enable signal to the gate of the field effect transistor D20. When the field effect transistor D20 receives the enable signal, the field effect transistor D20 is turned on, and the electromagnet of the relay RLY6 is energized to make the relay RLY6 closed.

10. The charging detection system according to claim 9, wherein, The CC detection circuit further includes: A voltage follower, the non-inverting input terminal of the voltage follower is connected to the signal input terminal of the relay RLY6, and the output terminal of the voltage follower is connected to the central control module.

11. The charging detection system according to claim 1, wherein The data acquisition module further includes: A CP detection circuit, the CP detection circuit is used to detect the CP line of the power supply device and send the detection result to the central control module, and the central control module is used to judge the state of the CP line of the power supply device according to the detection result.

12. The charging detection system according to claim 11, wherein The CP detection circuit includes: A comparator, the non-inverting input terminal of the comparator is used to connect to the CP line, and the inverting input terminal of the comparator is connected to a comparison voltage; Field effect transistor D22, the gate of the field effect transistor D22 is connected to the output terminal of the comparator, the source is grounded, and the drain is connected to the central control module; The comparator is used to compare the comparison voltage with the divided voltage signal of the CP line and output a comparison signal with a predetermined frequency and a predetermined duty cycle. The comparison signal drives the field effect transistor D22 to be turned on or off to form a detection signal, and the detection signal is output to the central control module.

13. The charging detection system according to claim 1, wherein It further includes: A protection module, the protection module is used to detect the voltage between any two of the L line, N line and PE line of the power supply device and send the detection result to the central control module, and the central control module is used to judge whether the leakage protection function of the power supply device is normal according to the detection result.

14. The charging detection system according to claim 13, wherein The protection module includes: Comparator, the non-inverting input terminal of the comparator is used to connect the L line, N line or PE line of the power supply device, the inverting input terminal of the comparator is used to connect the N line or PE line of the power supply device, and the output terminal of the comparator is connected to the central control module; The comparator is used to compare the voltage of the L line with the voltage of the N line, the voltage of the L line with the voltage of the PE line, or the voltage of the N line with the voltage of the PE line, and output a comparison signal, and the comparison signal is output to the central control module.

15. The charging detection system according to claim 13, wherein Three groups of protection modules are provided, which are respectively used to detect the voltages between the L line and the N line, the L line and the PE line, and the N line and the PE line of the power supply device.

16. The charging detection system according to claim 1, wherein It further includes: Display module, the display module is connected to the central control module and is used to display the judgment result of the central control module.

17. The charging detection system according to claim 1, wherein It further includes: Communication module, the communication module is connected to the central control module and is used to communicate with the outside world.

18. The charging detection system according to any one of claims 1-17, characterized in that, It further includes: Power supply module, the power supply module is used to supply power to the central control module and the data acquisition module.

19. The charging detection system according to claim 18, wherein The power supply module includes: USB power circuit, the USB power circuit is provided with a USB interface; Battery circuit, the battery circuit is provided with a battery, and the battery circuit is connected in parallel with the USB power circuit; Power switch, the USB power circuit and the battery circuit are respectively connected to the power switch, and the central control module and the data acquisition module are powered through the power switch; When an external power supply is connected to the USB power circuit, the battery circuit is open-circuited with the power switch.

20. A power supply device, characterized in that, Including the charging detection system according to any one of claims 1-19.

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