Detection device and charging apparatus

Abstract

The application relates to the technical field of charging, in particular to a detection device and a charging device. The detection device comprises a voltage suppression circuit and a reference source circuit. A first end of the voltage suppression circuit is used for coupling a control guide line of a charging device. When the voltage input at the first end of the voltage suppression circuit is greater than a preset voltage, a second end of the voltage suppression circuit outputs a first voltage; when the voltage input at the first end is less than or equal to the preset voltage, the second end outputs a second voltage. A first end of the reference source circuit is coupled to the second end of the voltage suppression circuit. When the second end of the voltage suppression circuit outputs the first voltage, a second end of the reference source circuit outputs a first indication signal. When the second end of the voltage suppression circuit outputs the second voltage, the second end of the reference source circuit outputs a second indication signal. The first indication signal is used for representing that the control guide line is not connected to a diode, and the second indication signal is used for representing that the control guide line is connected to the diode. The response speed and the accuracy of diode detection are improved.

Description

Technical Field

[0001] This application relates to the field of charging technology, and in particular to a detection device and a charging equipment. Background Technology

[0002] When charging a vehicle using charging stations, chargers, or other charging equipment, the presence of diodes in the control circuit must be detected to ensure that the charging equipment correctly identifies the connected device as the vehicle rather than other load devices.

[0003] In related technologies, the threshold circuit is connected to the operational amplifier of the control and guidance circuit for sampling, and the current obtained by sampling is amplified by the current amplification characteristics of the transistor. Then, the on / off signal of the optocoupler is controlled based on the amplified current to output different indication signals and realize the identification of the vehicle diode.

[0004] However, the current-controlled method is relatively weak and easily affected by external interference, resulting in low detection accuracy. In addition, the current sampling and amplification process prolongs the detection response time, which cannot guarantee the real-time performance of diode detection. Utility Model Content

[0005] The purpose of this application is to provide a detection device and a charging device, which aim to improve the response speed and accuracy of diode detection.

[0006] In a first aspect, a detection device is provided, comprising a voltage suppression circuit and a reference source circuit. A first terminal of the voltage suppression circuit is coupled to the control pilot (CP) line of a charging device. When the voltage input to the first terminal of the voltage suppression circuit is greater than a preset voltage, the second terminal of the voltage suppression circuit outputs a first voltage; when the voltage input to the first terminal of the voltage suppression circuit is less than or equal to the preset voltage, the second terminal of the voltage suppression circuit outputs a second voltage. The first terminal of the reference source circuit is coupled to the second terminal of the voltage suppression circuit. When the second terminal of the voltage suppression circuit outputs the first voltage, the second terminal of the reference source circuit outputs a first indication signal; when the second terminal of the voltage suppression circuit outputs the second voltage, the second terminal of the reference source circuit outputs a second indication signal. The first indication signal indicates that the control pilot line is not connected to a diode, and the second indication signal indicates that the control pilot line is connected to a diode.

[0007] The technical solution provided in this application compares the output voltage with a preset voltage through a voltage suppression circuit, and then outputs a first voltage or a second voltage to the reference source circuit according to the magnitude of the voltage output from the control lead. The reference source circuit outputs different indication signals according to the first voltage or the second voltage, and determines the presence of the diode on the control lead through the indication signals. It is a voltage-controlled circuit that directly detects the diode based on the voltage signal of the control lead. It is not easily affected by external environment, charging equipment and system interference, and does not require an amplifier circuit to amplify the voltage, thus improving the accuracy and response speed of diode detection.

[0008] In one embodiment, the reference source circuit includes a voltage divider circuit and a voltage regulator circuit. The first terminal of the voltage divider circuit is coupled to a power supply, the second terminal is coupled to ground, and the third terminal serves as the first terminal of the reference source circuit. The first terminal of the voltage regulator circuit is coupled to the first terminal of the voltage divider circuit, the second terminal of the voltage regulator circuit is coupled to the second terminal of the voltage divider circuit, the third terminal of the voltage regulator circuit is coupled to the third terminal of the voltage divider circuit, and the fourth terminal of the voltage regulator circuit serves as the second terminal of the reference source circuit. A stable voltage is provided to the third terminal of the voltage regulator circuit through the third terminal of the voltage divider circuit. When the voltage at the third terminal of the voltage regulator circuit remains unchanged, the voltage regulator circuit outputs a stable indication signal based on the voltage provided by the voltage divider circuit.

[0009] In one embodiment, the voltage divider circuit includes a first resistor and a second resistor. The first terminal of the first resistor serves as the first terminal of the voltage divider circuit, the first terminal of the second resistor is coupled to the second terminal of the first resistor, the second terminal of the second resistor serves as the second terminal of the voltage divider circuit, and the common terminal of the first and second resistors serves as the third terminal of the voltage divider circuit. Voltage division using the first and second resistors results in a simple circuit structure, high reliability, and more flexible adjustment of the voltage division ratio. Furthermore, the resistors are inexpensive, reducing the circuit cost of the detection device.

[0010] In one embodiment, the voltage regulator circuit includes a third resistor and a Zener diode. The first terminal of the third resistor serves as the first terminal of the voltage regulator circuit, and the first terminal of the Zener diode is coupled to the second terminal of the third resistor. The first terminal of the Zener diode is also coupled to the fourth terminal of the voltage regulator circuit. The second terminal of the Zener diode serves as the second terminal of the voltage regulator circuit, and the third terminal of the Zener diode serves as the third terminal of the voltage regulator circuit. The Zener diode controls the conduction state between the first and second terminals based on the voltage at its third terminal, thereby causing the first terminal of the voltage regulator to output different indicator signals. This eliminates the need for amplifiers, optocouplers, and other components, reducing the cost of the detection device while further improving the circuit's response speed.

[0011] In one embodiment, the voltage suppression circuit includes a first diode, a Zener diode, a fourth resistor, and a fifth resistor. The cathode of the first diode serves as the first terminal of the voltage suppression circuit, the anode of the Zener diode is coupled to the anode of the first diode, the first terminal of the fourth resistor is coupled to the cathode of the Zener diode, the second terminal of the fourth resistor serves as the second terminal of the voltage suppression circuit, the first terminal of the fifth resistor is coupled to the common terminal of the first diode and the Zener diode, and the second terminal of the fifth resistor is coupled to ground. By controlling the positive voltage of the control lead through the cutoff of the first diode, negative voltages of different control lead voltage values ​​are transmitted to the Zener diode, forming different voltage differences across the Zener diode, controlling the reverse breakdown state of the Zener diode, thereby realizing the control of the conduction and cutoff of the circuit containing the Zener diode, so that the voltage suppression circuit outputs a first voltage or a second voltage to the reference source circuit.

[0012] In one embodiment, the detection device provided in this application further includes a filtering circuit. A first terminal of the filtering circuit is coupled to a second terminal of the reference source circuit, a second terminal of the filtering circuit is coupled to a ground terminal, and a third terminal of the filtering circuit outputs a first indication signal or a second indication signal. The filtering circuit achieves smooth filtering of the first and second indication signals, suppressing noise and interference.

[0013] In one embodiment, the filter circuit includes a sixth resistor and a first capacitor. The first terminal of the sixth resistor serves as the first terminal of the filter circuit, and the second terminal of the sixth resistor serves as the third terminal of the filter circuit. The first terminal of the first capacitor is coupled to the first terminal of the sixth resistor, and the second terminal of the first capacitor is coupled to ground. By using the sixth resistor and the first capacitor to form the filter circuit, circuit costs are reduced, the components occupy a small size, and circuit integration is facilitated. Simultaneously, the sixth resistor can also perform current limiting while filtering.

[0014] In one implementation, the preset voltage is less than -6V or equal to -12V.

[0015] Secondly, a charging device is also provided, comprising a charging unit and a detection unit. The charging unit is used to charge electrical equipment. The detection unit includes a voltage suppression circuit and a reference source circuit. A first terminal of the voltage suppression circuit is coupled to a control lead of the charging unit; when the voltage input to the first terminal of the voltage suppression circuit is greater than a preset voltage, the second terminal of the voltage suppression circuit outputs a first voltage; when the voltage input to the first terminal of the voltage suppression circuit is less than or equal to the preset voltage, the second terminal of the voltage suppression circuit outputs a second voltage; a first terminal of the reference source circuit is coupled to the second terminal of the voltage suppression circuit; when the second terminal of the voltage suppression circuit outputs the first voltage, the second terminal of the reference source circuit outputs a first indication signal; when the second terminal of the voltage suppression circuit outputs the second voltage, the second terminal of the reference source circuit outputs a second indication signal. The first indication signal indicates that the control lead is not connected to a diode, and the second indication signal indicates that the control lead is connected to a diode.

[0016] The technical solution provided in this application compares the voltage output by the control lead of the charging device with a preset voltage through a voltage suppression circuit in the detection device. Then, based on the magnitude of the voltage output by the control lead, it outputs a first voltage or a second voltage to the reference source circuit, causing the reference source circuit to output different indication signals based on the first voltage or the second voltage. The presence of the diode on the control lead is determined by the indication signal. The detection device is a voltage-controlled circuit that directly detects the diode based on the voltage signal of the control lead. It is not easily affected by external environment, charging equipment and system interference, and does not require an amplifier circuit to amplify the voltage, thus improving the accuracy and response speed of diode detection.

[0017] In one embodiment, the charging device is configured to send a pulse width modulation (PWM) signal to the device via a control lead, causing the control lead to output a first PWM signal or a second PWM signal to a first terminal of the detection device. The first PWM signal has a negative voltage peak value greater than a preset voltage; the second PWM signal has a negative voltage peak value less than or equal to a preset voltage. By directly outputting the first or second PWM signal to the detection device via the control lead, the signal processing steps of signal amplification and voltage sampling are eliminated, thus improving the response speed of diode detection.

[0018] In one embodiment, the control lead is configured to output a first PWM signal to a first terminal of the detection device when the control lead fails to connect to the diode in the electrical device. When the control lead outputs the first PWM signal, it indicates that the control lead has failed to connect to the diode in the electrical device. The detection device outputs a first indication signal based on the first PWM signal, establishing a correspondence between the failure of the control lead to connect to the diode and the first indication signal.

[0019] In one embodiment, the control lead is configured to output a second PWM signal to a first terminal of the detection device when the control lead is connected to a diode in the electrical device. The output of the second PWM signal indicates that the control lead is connected to the diode in the electrical device, and the detection device outputs a second indication signal based on the second PWM signal, establishing a correspondence between the control lead's unsuccessful connection to the diode and the second indication signal. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a charging device for charging a vehicle, provided in an embodiment of this application.

[0022] Figure 2 A schematic diagram of a PWM signal provided in an embodiment of this application;

[0023] Figure 3 This is another schematic diagram of a PWM signal provided in an embodiment of this application;

[0024] Figure 4 This is a schematic diagram of the structure of a detection device provided in an embodiment of this application;

[0025] Figure 5 This is a schematic diagram of another detection device provided in an embodiment of this application;

[0026] Figure 6 A schematic diagram of an indication signal provided in an embodiment of this application;

[0027] Figure 7 This is a schematic diagram of another indication signal provided in an embodiment of this application.

[0028] Figure label:

[0029] 100. Plug;

[0030] 10. Functional box;

[0031] K1, first switch; K2, second switch; S1, third switch; S2, fourth switch; S3, fifth switch; R11, first pull-down resistor; R12, second pull-down resistor; R13, voltage divider resistor; D1, diode.

[0032] 200. Vehicle charging interface;

[0033] 300. On-board charger;

[0034] 400. Voltage suppression circuit;

[0035] D2, first diode; D3, Zener diode; R4, fourth resistor; R5, fifth resistor;

[0036] 410. Reference source circuit;

[0037] 41. Voltage divider circuit;

[0038] R1 is the first resistor; R2 is the second resistor;

[0039] 42. Voltage regulator circuit;

[0040] U1, Zener diode; R3, third resistor;

[0041] R6 is the sixth resistor; C1 is the first capacitor. Detailed Implementation

[0042] In the embodiments of this application, the terms "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," "third," "fourth," "fifth," and "sixth" may explicitly or implicitly include one or more of that feature.

[0043] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. "A and / or B" includes three combinations: A only, B only, and a combination of A and B.

[0044] In describing some embodiments, the terms "coupled" and "connected," and their derivative expressions, may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact with each other. Similarly, the term "coupled" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact. However, the terms "coupled" or "communicatively coupled" may also refer to two or more components that do not have direct contact with each other but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the content of this document.

[0045] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner. In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0046] This application provides a charging device.

[0047] For example, the charging device is used to charge the electrical equipment.

[0048] Optionally, the charging equipment includes charging piles, charging vehicles, charging boxes, etc., which are not limited in this application.

[0049] Electrical equipment includes vehicles and other load-bearing equipment, such as energy storage stations, drones, aircraft, robots, and other automated equipment.

[0050] Among them, vehicles are also referred to as means of transportation, mobile carriers, etc., including but not limited to cars, sport utility vehicles (SUVs), trucks, electric vehicles, motorcycles, tricycles, driverless taxis, intelligent connected buses, autonomous logistics vehicles, electric trucks, electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), fuel cell vehicles (FCVs), autonomous vehicles, intelligent and connected vehicles (ICVs), driverless vehicles, special vehicles (such as ambulances, fire trucks, police cars, etc.), agricultural vehicles, mining vehicles, forestry vehicles, airport vehicles, etc., and this application does not impose specific restrictions on them.

[0051] To avoid charging safety risks and ensure charging protocol compliance, it is necessary to confirm that the device being charged is a vehicle and not other load equipment. To prevent reverse current and meet standard requirements, electric vehicles requiring charging must contain diodes or other unidirectional conductive devices. Therefore, related technologies determine whether the device is a vehicle by detecting the presence or absence of a diode. Specifically, diode detection is achieved by detecting the voltage of the control lead through current sampling circuits or operational amplifier circuits. This requires optocouplers, integrated circuits (ICs), etc., resulting in large space requirements and high costs. Signal amplification and processing also prolong the diode detection response time. Furthermore, current-controlled methods rely on relatively weak currents, making them susceptible to external interference and affecting detection accuracy.

[0052] Based on this, embodiments of this application provide a detection device and a charging device. For example, please refer to... Figure 1 , Figure 1 This is a schematic diagram of a charging device for charging a vehicle. The charging device is a charging pile, such as... Figure 1As shown, the charging pile plug 100 is inserted into the vehicle charging interface 200 so that the live wire and neutral wire of the plug 100 are coupled to the vehicle's on-board charger 300, and the ground wire of the plug 100 is grounded. The vehicle is charged when the first switch K1 and the second switch K2 are turned on. The charging pile's functional box 110 (control module) includes a power supply control device 10, which controls the charging process of the charging pile on the vehicle.

[0053] For example, the power supply control device 10 communicates with the vehicle in real time by outputting a PWM signal through the CP line to coordinate the charging process. For example: When the third switch S1 on the CP line is turned on, the power supply control device 10 outputs a ±12V square wave voltage with a frequency of 1KHZ through the CP line. When the plug 100 is not inserted into the vehicle charging interface 200, the positive voltage of the CP line is 12V, indicating that the charging pile is in standby mode. When the plug 100 is inserted into the vehicle charging interface 200, the CP line is coupled to the first pull-down resistor R11. The first pull-down resistor R11 and the voltage divider resistor R13 divide the voltage, causing the positive voltage of the CP line to be pulled down to 9V. At this time, it indicates that the vehicle is successfully connected but not ready to charge. When the vehicle battery management system (BMS) determines that the vehicle is ready to charge, it controls the fourth switch S2 to be turned on. The CP line is simultaneously coupled to the first pull-down resistor R11 and the second pull-down resistor R12. The first pull-down resistor R11, the second pull-down resistor R12 and the voltage divider resistor R13 divide the voltage, causing the positive voltage of the CP line to be pulled down to 6V. At this time, it indicates that the charging pile has started charging the vehicle and entered the charging state. Because of the presence of diode D1 on the vehicle side, when plug 100 is not inserted into vehicle charging interface 200, the negative voltage of the CP line is -12V (negative 12V). When plug 100 is inserted into vehicle charging interface 200, the negative voltage of the CP line is cut off by diode D1, and remains -12V (negative 12V). When the charging station is charging other electrical devices that do not have diode D1, plug 100 is inserted into vehicle charging interface 200, and the CP line is simultaneously coupled to the first pull-down resistor R11 and the second pull-down resistor R12. At this time, the negative voltage of the CP line is divided to -6V (negative 6V). Therefore, when the charging station is connected to vehicle charging interface 200 to charge the vehicle, if... Figure 2 As shown, the CP line outputs a PWM signal (second PWM signal) with a positive voltage of 6V and a negative voltage of -12V (negative 12V); when the charging station charges other electrical devices that do not have diodes, such as Figure 3 As shown, the CP line outputs a PWM signal (first PWM signal) with a positive voltage of 6V and a negative voltage of -6V (negative 6V).

[0054] In some embodiments, the vehicle BMS can dynamically change the duty cycle of the CP line PWM signal to request the charging device to adjust the charging current, for example, by reducing the current when the battery temperature rises.

[0055] In some embodiments, when the CP line voltage is abnormal (such as short circuit or open circuit), the charging device immediately stops supplying power (e.g., an error message "CP signal failure" is reported).

[0056] In some embodiments, the function box 110 also includes a charging protection circuit such as a leakage current protector.

[0057] In some embodiments, a vehicle control device is provided on the vehicle side for determining whether the vehicle is ready for charging based on the voltage change when the fifth switch S3 is turned on.

[0058] In some embodiments, the charging device includes a charging device and a detection device.

[0059] The charging device is used to charge electrical equipment.

[0060] For example, the charging device sends a PWM signal to the power-consuming device through the CP line, so that the CP line outputs a first PWM signal or a second PWM signal to the first end of the detection device.

[0061] The negative voltage peak of the first PWM signal is greater than the preset voltage; the negative voltage peak of the second PWM signal is less than or equal to the preset voltage.

[0062] For example, when the CP line is not successfully connected to the diode in the electrical device, it outputs a first PWM signal to the first terminal of the detection device; when it is connected to the diode in the electrical device, it outputs a second PWM signal to the first terminal of the detection device. For instance, when the CP line is not successfully connected to the diode in the electrical device, the negative voltage peak of the first PWM signal is -6V (negative 6V); when it is connected to the diode in the electrical device, the negative voltage peak of the second PWM signal is -12V (negative 12V).

[0063] The detection device is used to detect the presence of diodes in electrical equipment based on the PWM signal output from the CP line, and thus detect whether the electrical equipment is a vehicle.

[0064] In some embodiments, the detection device is also applied in fields requiring diode detection, such as electronic equipment and circuit protection, communication and radio frequency, and solar photovoltaic systems, but this application does not limit it to these applications.

[0065] In some embodiments, the detection device includes a voltage suppression circuit and a reference source circuit.

[0066] The voltage suppression circuit is used to detect the input voltage or PEM signal and output different voltages based on different input voltages and PWM signals, thereby enabling the reference source circuit to output corresponding indicator signals based on the different voltages output by the voltage suppression circuit.

[0067] For example, such as Figure 4 As shown, Figure 4This is a schematic diagram of a detection device provided in an embodiment of this application. The first terminal of the voltage suppression circuit 400 is coupled to the CP line of the charging device. When the voltage input to the first terminal of the voltage suppression circuit 400 is greater than a preset voltage, the second terminal of the voltage suppression circuit 400 outputs a first voltage; when the voltage input to the first terminal of the voltage suppression circuit 400 is less than or equal to the preset voltage, the second terminal of the voltage suppression circuit 400 outputs a second voltage. The first terminal of the reference source circuit 410 is coupled to the second terminal of the voltage suppression circuit 400. When the second terminal of the voltage suppression circuit 400 outputs the first voltage, the second terminal of the reference source circuit 410 outputs a first indication signal; when the second terminal of the voltage suppression circuit 400 outputs the second voltage, the second terminal of the reference source circuit 410 outputs a second indication signal.

[0068] The first indicator signal is used to indicate that the CP line is not connected to a diode, and the second indicator signal is used to indicate that the CP line is connected to a diode.

[0069] In some embodiments, the preset voltage is less than -6V or equal to -12V. For example, when the preset voltage is -12V, and the voltage input to the first terminal of the voltage suppression circuit 400 is positive 6V or negative -12V, -12V equals the preset voltage. The second terminal of the voltage suppression circuit 400 outputs a second voltage, and the second terminal of the reference source circuit 410 outputs a second indication signal, indicating that the CP line is connected to the diode and the charging device is charging the vehicle.

[0070] In some embodiments, the first indication signal and the second indication signal are sent to the power supply control device 10 of the charging device, the microcontroller unit (MCU), the human-machine interface, etc., so as to identify and judge the first indication signal and the second indication signal. For example, when the second terminal of the reference source circuit 410 outputs the first indication signal to the MCU, the MCU determines that the CP line is not connected to the diode and controls the charging device to stop charging the device.

[0071] In some embodiments, such as Figure 5 As shown, the reference source circuit includes a voltage divider circuit 41 and a voltage regulator circuit 42.

[0072] The voltage divider circuit 41 is used to divide the power supply voltage of the input reference source circuit to provide a stable voltage for the voltage regulator circuit 42.

[0073] The voltage regulator circuit 42 is used to output different indicator signals based on the voltage provided by the voltage divider circuit 41.

[0074] For example, the first end of the voltage divider circuit 41 is used to couple to the power supply, the second end of the voltage divider circuit 41 is used to couple to the ground terminal, and the third end of the voltage divider circuit 41 serves as the first end of the reference source circuit.

[0075] Optionally, the voltage divider circuit 41 can be a resistor voltage divider circuit, a diode voltage divider circuit, etc.

[0076] For example, the voltage divider circuit 41 includes a first resistor R1 and a second resistor R2. The first end of the first resistor R1 serves as the first end of the voltage divider circuit 41, the first end of the second resistor R2 is coupled to the second end of the first resistor R1, the second end of the second resistor R2 serves as the second end of the voltage divider circuit 41, and the common end of the first resistor R1 and the second resistor R2 serves as the third end of the voltage divider circuit 41.

[0077] For example, the first terminal of the voltage regulator circuit 42 is coupled to the first terminal of the voltage divider circuit 41, the second terminal of the voltage regulator circuit 42 is coupled to the second terminal of the voltage divider circuit 41, the third terminal of the voltage regulator circuit 42 is coupled to the third terminal of the voltage divider circuit 41, and the fourth terminal of the voltage regulator circuit 42 serves as the second terminal of the reference source circuit. Based on the voltage input at the third terminal of the voltage regulator circuit 42, the voltage regulator circuit 42 outputs different indication signals from its fourth terminal.

[0078] For example, the voltage regulator circuit 42 includes a third resistor R3 and a Zener diode U1. The first end of the third resistor R3 serves as the first end of the voltage regulator circuit, the first end of the Zener diode U1 is coupled to the second end of the third resistor R3, and the first end of the Zener diode U1 is also coupled to the fourth end of the voltage regulator circuit; the second end of the Zener diode U1 serves as the second end of the voltage regulator circuit, and the third end of the Zener diode U1 serves as the third end of the voltage regulator circuit.

[0079] The third resistor, R3, is used for current limiting.

[0080] Zener diode U1 is a controllable Zener diode, specifically capable of switching the conduction state between its first and second terminals based on the voltage input to its third terminal. For example, when the voltage input to the third terminal of Zener diode U1 is greater than 2.5V, the first and second terminals of Zener diode U1 are connected.

[0081] In some embodiments, the voltage suppression circuit is a threshold circuit based on a Zener diode.

[0082] In some embodiments, such as Figure 5 As shown, the voltage suppression circuit 400 includes a first diode D2, a Zener diode D3, a fourth resistor R4, and a fifth resistor R5. The cathode of the first diode D2 serves as the first terminal of the voltage suppression circuit, the anode of the Zener diode D3 is coupled to the anode of the first diode, the first terminal of the fourth resistor R4 is coupled to the cathode of the Zener diode D3, the second terminal of the fourth resistor R4 serves as the second terminal of the voltage suppression circuit, the first terminal of the fifth resistor R5 is coupled to the common terminal of the first diode D2 and the Zener diode D3, and the second terminal of the fifth resistor R5 is coupled to the ground terminal.

[0083] Among them, the fourth resistor R4 and the fifth resistor R5 are used for current limiting.

[0084] Zener diode D3, also known as Zener diode, breaks down in reverse and maintains voltage stability when the reverse voltage of Zener diode D3 reaches its rated voltage (such as 5.1V, 12V, etc.), that is, the circuit containing Zener diode D3 is turned on.

[0085] Whether the CP line is connected to a diode or not, the positive voltage output by the CP line to the voltage suppression circuit 400 remains unchanged. Therefore, the positive voltage output by the CP line to the voltage suppression circuit 400 is cut off by the first diode D2, and the first voltage or the second voltage is output based on the magnitude of the negative voltage output by the CP line to the voltage suppression circuit 400.

[0086] For example, when the CP line inputs the second PWM signal to the voltage suppression circuit 400, the 6V voltage of the second PWM signal is cut off by the first diode D2. At this time, the voltage difference across the Zener diode D3 is less than the conduction voltage difference (e.g., 10V), so the Zener diode D3 does not conduct. The voltage output by the voltage divider circuit 41 to the third terminal of the Zener diode U1 is greater than 2.5V, and the first and second terminals of the Zener diode U1 are connected, resulting in a 0.3V output from the first terminal of the Zener diode U1. When the -12V (negative 12V) voltage of the second PWM signal conducts the first diode D2, the voltage across the Zener diode D3 is greater than the conduction voltage difference, thus pulling down the voltage output to the third terminal of the Zener diode U1. The first and second terminals of the Zener diode U1 are not connected, and when the power supply voltage is 5V, the first terminal of the Zener diode U1 outputs a 5V voltage. Therefore, when the CP line inputs the second PWM signal to the voltage suppression circuit 400, such as... Figure 6 The image shows the second indicator signal output by the reference source circuit.

[0087] When the CP line inputs the first PWM signal to the voltage suppression circuit 400, the 6V voltage of the first PWM signal is cut off by the first diode D2. At this time, the voltage difference across the Zener diode D3 is less than the conduction voltage difference (e.g., 10V), so the Zener diode D3 does not conduct. The voltage output by the voltage divider circuit 41 to the third terminal of the Zener diode U1 is greater than 2.5V, and the first and second terminals of the Zener diode U1 are connected, resulting in a 0.3V output from the first terminal of the Zener diode U1. When the -6V (negative 6V) voltage of the first PWM signal conducts the first diode D2, the voltage across the Zener diode D3 is still less than the conduction voltage difference, so the Zener diode D3 does not conduct. The voltage output by the voltage divider circuit 41 to the third terminal of the Zener diode U1 is greater than 2.5V, and the first and second terminals of the Zener diode U1 are connected, resulting in a 0.3V output from the first terminal of the Zener diode U1. Therefore, when the CP line inputs the first PWM signal to the voltage suppression circuit 400, such as... Figure 7 The first indication signal output by the reference source circuit is shown.

[0088] In some embodiments, the detection device provided in this application further includes a filtering circuit.

[0089] For example, the first terminal of the filter circuit is coupled to the second terminal of the reference source circuit, the second terminal of the filter circuit is coupled to the ground terminal, and the third terminal of the filter circuit outputs a first indicator signal or a second indicator signal.

[0090] Optionally, the filter circuit includes a resistor-capacitor circuit, an inductor-capacitor circuit, etc.

[0091] For example: Figure 5 As shown, the filter circuit includes a sixth resistor R6 and a first capacitor C1. The first end of the sixth resistor R6 serves as the first terminal of the filter circuit, and the second end of the sixth resistor R6 serves as the third terminal of the filter circuit. The first end of the first capacitor C1 is coupled to the first end of the sixth resistor R6, and the second end of the first capacitor C1 is coupled to the ground terminal.

[0092] Among them, the sixth resistor R6 and the first capacitor C1 work together to filter and limit current.

[0093] In the description of the embodiments of this application, specific features, structures, materials or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0094] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A detection device, characterized in that, include: A voltage suppression circuit, wherein a first terminal of the voltage suppression circuit is used to couple to the control lead of the charging device; when the voltage input to the first terminal of the voltage suppression circuit is greater than a preset voltage, the second terminal of the voltage suppression circuit outputs a first voltage; when the voltage input to the first terminal of the voltage suppression circuit is less than or equal to the preset voltage, the second terminal of the voltage suppression circuit outputs a second voltage. A reference source circuit, wherein a first terminal of the reference source circuit is coupled to a second terminal of the voltage suppression circuit; when the second terminal of the voltage suppression circuit outputs the first voltage, the second terminal of the reference source circuit outputs a first indication signal; when the second terminal of the voltage suppression circuit outputs the second voltage, the second terminal of the reference source circuit outputs a second indication signal. The first indication signal is used to indicate that the control lead is not connected to a diode, and the second indication signal is used to indicate that the control lead is connected to a diode.

2. The detection device according to claim 1, characterized in that, The reference source circuit includes: A voltage divider circuit, wherein the first terminal of the voltage divider circuit is used to couple to a power supply, the second terminal of the voltage divider circuit is used to couple to a ground terminal, and the third terminal of the voltage divider circuit serves as the first terminal of the reference source circuit. A voltage regulator circuit, wherein a first terminal of the voltage regulator circuit is coupled to a first terminal of the voltage divider circuit, a second terminal of the voltage regulator circuit is coupled to a second terminal of the voltage divider circuit, a third terminal of the voltage regulator circuit is coupled to a third terminal of the voltage divider circuit, and a fourth terminal of the voltage regulator circuit serves as the second terminal of the reference source circuit.

3. The detection device according to claim 2, characterized in that, The voltage divider circuit includes: The first resistor, with its first end serving as the first end of the voltage divider circuit; The second resistor has its first end coupled to the second end of the first resistor. The second end of the second resistor serves as the second end of the voltage divider circuit, and the common connection of the first resistor and the second resistor serves as the third end of the voltage divider circuit.

4. The detection device according to claim 2, characterized in that, The voltage regulator circuit includes: The third resistor, the first end of which serves as the first end of the voltage regulator circuit; A Zener diode, wherein the first end of the Zener diode is coupled to the second end of the third resistor, and the first end of the Zener diode is also coupled to the fourth end of the voltage regulator circuit; the second end of the Zener diode serves as the second end of the voltage regulator circuit, and the third end of the Zener diode serves as the third end of the voltage regulator circuit.

5. The detection device according to claim 1, characterized in that, The voltage suppression circuit includes: The first diode, the cathode of the first diode serving as the first terminal of the voltage suppression circuit; A Zener diode, wherein the anode of the Zener diode is coupled to the anode of the first diode; The fourth resistor has its first end coupled to the cathode of the Zener diode, and its second end serves as the second terminal of the voltage suppression circuit. The fifth resistor has its first end coupled to the common terminal of the first diode and the Zener diode, and its second end coupled to the ground terminal.

6. The detection device according to claim 1, characterized in that, The detection device further includes: A filter circuit, wherein the first terminal of the filter circuit is coupled to the second terminal of the reference source circuit, the second terminal of the filter circuit is coupled to the ground terminal, and the third terminal of the filter circuit outputs the first indicator signal or the second indicator signal.

7. The detection device according to claim 6, characterized in that, The filtering circuit includes: The sixth resistor has its first end serving as the first end of the filter circuit and its second end serving as the third end of the filter circuit. A first capacitor, the first end of which is coupled to the first end of the sixth resistor, and the second end of which is coupled to the ground terminal.

8. The detection device according to claim 1, characterized in that, The preset voltage is less than -6V or equal to -12V.

9. A charging device, characterized in that, The charging device includes: A charging device used to charge electrical equipment; A detection device includes a voltage suppression circuit and a reference source circuit. A first terminal of the voltage suppression circuit is coupled to a control lead of the charging device. When the voltage input to the first terminal of the voltage suppression circuit is greater than a preset voltage, the second terminal of the voltage suppression circuit outputs a first voltage. When the voltage input to the first terminal of the voltage suppression circuit is less than or equal to the preset voltage, the second terminal of the voltage suppression circuit outputs a second voltage. A first terminal of the reference source circuit is coupled to the second terminal of the voltage suppression circuit. When the second terminal of the voltage suppression circuit outputs the first voltage, the second terminal of the reference source circuit outputs a first indication signal. When the second terminal of the voltage suppression circuit outputs the second voltage, the second terminal of the reference source circuit outputs a second indication signal. Wherein, the first indication signal is used to indicate that the control lead is not connected to the diode, and the second indication signal is used to indicate that the control lead is connected to the diode.

10. The charging device according to claim 9, characterized in that, The charging device is configured to send a pulse width modulation (PWM) signal to the electrical device via the control lead, so that the control lead outputs a first PWM signal or a second PWM signal to a first terminal of the detection device; wherein the negative voltage peak value of the first PWM signal is greater than the preset voltage; and the negative voltage peak value of the second PWM signal is less than or equal to the preset voltage.

11. The charging device according to claim 10, characterized in that, The control lead is configured to output the first PWM signal to the first terminal of the detection device when the control lead fails to connect to the diode in the electrical equipment.

12. The charging device according to claim 10, characterized in that, The control lead is configured to output the second PWM signal to the first terminal of the detection device when the control lead is connected to the diode in the electrical equipment.

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