Voltage type detection circuit, battery, charging interface, and vehicle

Abstract

Provided in the present application are a voltage type detection circuit, a battery, a charging interface, and a vehicle. The detection circuit is configured to detect the output voltage type of a charging pile, which comprises a positive electrode and a negative electrode. The circuit comprises: a voltage processing module, an isolation optocoupler and an output module, wherein an input end of the voltage processing module is configured to be connected to a positive electrode of a charging pile, and an output end of the voltage processing module is connected to an input end of the isolation optocoupler; an output end of the isolation optocoupler is connected to an input end of the output module; the voltage processing module is configured to output a voltage signal on the basis of an output voltage type of the charging pile, the output voltage type of the charging pile comprising an alternating-current source or a direct-current source; and the isolation optocoupler is turned on or turned off under the control of the voltage signal, and the output module outputs a voltage type signal under the control of the turning-on or turning-off of the isolation optocoupler. The detection circuit of the present application has a simple structure, and can achieve the effect of efficiently detecting the type of a power supply voltage.

Description

Voltage type detection circuit, battery, charging interface and vehicle

[0001] The present application claims priority to the Chinese patent application No. 202410849536.4, filed on June 27, 2024, and entitled "Voltage type detection circuit, battery, charging interface and vehicle", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of automobile charging technology, in particular to a voltage type detection circuit, a battery, a charging interface and a vehicle. BACKGROUND

[0003] With the rapid development of the new energy automobile industry, the safety and efficiency of charging technology, as a key link in the electric vehicle industry chain, have attracted widespread attention. The performance stability and reliability of the charging gun, as the main equipment for charging electric vehicles, directly affect the charging efficiency and safety of electric vehicles. In actual application, the charging gun may provide alternating current or direct current to meet different vehicle models and charging needs. Therefore, accurately detecting whether the charging energy source is an alternating current source or a direct current source before formally starting charging is of great significance to ensuring the safety and efficiency of the charging process.

[0004] In the prior art, for voltage type detection of the charging gun, a method of converting a large voltage into a small voltage through resistance division, isolation and amplification is usually adopted. Specifically, the voltage output by the charging gun is first divided by a resistance network to obtain a voltage value suitable for subsequent processing. Then, the divided voltage is isolated and amplified by an isolation amplifier to avoid the influence of high voltage on the subsequent circuit. Next, the amplified voltage signal is input into a high-frequency analog-to-digital converter chip for high-speed sampling and quantization processing to obtain a digitalized voltage signal, and then it is determined whether the charging energy source is an alternating current source or a direct current source.

[0005] However, the circuit used in the above voltage type detection has low detection efficiency and accuracy, and requires the use of high-precision resistors and high-frequency analog-to-digital converter chips, which is costly. SUMMARY

[0006] The present application provides a voltage type detection circuit, a battery, a charging interface and a vehicle to solve the problem of low charging pile voltage type detection efficiency in the prior art.

[0007] In a first aspect, the present application provides a voltage type detection circuit for detecting the output voltage type of a charging pile, the charging pile comprising a positive electrode and a negative electrode; the circuit comprising: a voltage processing module, an isolation optocoupler and an output module.

[0008] The input end of the voltage processing module is used for being connected with the positive pole of the charging pile, and the output end of the voltage processing module is connected with the input end of the isolation optocoupler; the output end of the isolation optocoupler is connected with the input end of the output module;

[0009] The voltage processing module is used for outputting a voltage signal according to the output voltage type of the charging pile, and the output voltage type of the charging pile includes an alternating current source or a direct current source;

[0010] The isolation optocoupler is turned on or turned off under the control of the voltage signal, and the output module outputs a voltage type signal under the control of the turning on or turning off of the isolation optocoupler.

[0011] In some embodiments, the voltage processing module is used for:

[0012] outputting a first voltage signal when the charging pile outputs alternating current, and the first voltage signal controls the periodic turning on of the isolation optocoupler;

[0013] outputting a second voltage signal when the charging pile outputs direct current, and the second voltage signal controls the turning off or turning on of the isolation optocoupler;

[0014] The first voltage signal is an alternating current signal, the second voltage signal is a direct current signal, and the amplitude voltage of the first voltage signal is greater than the voltage of the second voltage signal.

[0015] In some embodiments, the voltage processing module includes a first resistor, a second resistor, a third resistor and a first capacitor;

[0016] The first end of the first resistor is used for being connected with the positive pole of the charging pile, and the second end of the first resistor is connected with the first terminal of the input end of the isolation optocoupler;

[0017] The first end of the second resistor is used for being connected with the negative pole of the charging pile, and the second end of the second resistor is connected with the first end of the third resistor;

[0018] The second end of the third resistor is connected with the second terminal of the input end of the isolation optocoupler;

[0019] The first end of the first capacitor is connected with the first end of the third resistor, and the second end of the first capacitor is connected with the second end of the third resistor.

[0020] In some embodiments, the voltage processing module includes a first resistor, a third resistor and a first capacitor;

[0021] The first end of the first resistor is used for being connected with the positive pole of the charging pile, and the second end of the first resistor is connected with the first terminal of the input end of the isolation optocoupler;

[0022] The first end of the third resistor is used for being connected with the negative pole of the charging pile, and the second end of the third resistor is connected with the second terminal of the input end of the isolation optocoupler;

[0023] The first end of the first capacitor is connected with the first end of the third resistor, and the second end of the first capacitor is connected with the second end of the third resistor.

[0024] In some embodiments, the voltage processing module comprises a second resistor, a third resistor, and a first capacitor.

[0025] The first terminal of the isolated opto-coupler input end is used for being connected with the positive electrode of the charging pile.

[0026] The first end of the second resistor is used for being connected with the negative electrode of the charging pile, and the second end of the second resistor is connected with the first end of the third resistor.

[0027] The second end of the third resistor is connected with the second terminal of the isolated opto-coupler input end.

[0028] The first end of the first capacitor is connected with the first end of the third resistor, and the second end of the first capacitor is connected with the second end of the third resistor.

[0029] In some embodiments, the voltage processing module further comprises a clamping diode.

[0030] The first end of the clamping diode is connected with the first terminal of the isolated opto-coupler input end.

[0031] The second end of the clamping diode is connected with the second terminal of the isolated opto-coupler input end.

[0032] In some embodiments, the circuit further comprises a voltage stabilizing diode.

[0033] The first end of the voltage stabilizing diode is used for being connected with the positive electrode of the charging pile.

[0034] The second end of the voltage stabilizing diode is connected with the first terminal of the isolated opto-coupler input end.

[0035] In some embodiments, the output module comprises a fourth resistor.

[0036] The first end of the fourth resistor is connected with the output end of the power supply voltage.

[0037] The second end of the fourth resistor is connected with the first terminal of the isolated opto-coupler output end, and the second terminal of the isolated opto-coupler output end is grounded.

[0038] In some embodiments, the output module comprises a second capacitor.

[0039] The first end of the second capacitor is connected with the first terminal of the isolated opto-coupler output end.

[0040] The second end of the second capacitor is connected with the second terminal of the isolated opto-coupler output end.

[0041] In the second aspect, the application provides a battery comprising the voltage type detection circuit in the first aspect and any one of the embodiments of the first aspect.

[0042] In a third aspect, the application provides a charging interface, comprising the voltage type detection circuit in the first aspect and any one of the embodiments of the first aspect.

[0043] In a fourth aspect, the application provides a vehicle, comprising the battery in the second aspect or the charging interface in the third aspect.

[0044] The voltage type detection circuit, the battery, the charging interface and the vehicle provided by the application can output a voltage signal according to the output voltage type of the charging pile through the voltage processing module, turn on or turn off the isolation optocoupler under the control of the voltage signal, and output a voltage type signal under the control of the turn-on or turn-off of the isolation optocoupler, so that the output voltage type of the charging pile can be determined according to the voltage type signal. The detection circuit has a simple structure and can efficiently detect the voltage type of the charging pile. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0046] FIG. 1 is a schematic diagram of a charging circuit structure of an electric vehicle in the prior art;

[0047] FIG. 2 is a schematic diagram of a voltage type detection circuit structure in the prior art;

[0048] FIG. 3 is a schematic diagram of a voltage type detection circuit structure according to an embodiment of the application;

[0049] FIG. 4 is a schematic diagram of a voltage type detection circuit structure according to another embodiment of the application;

[0050] FIG. 5 is a schematic diagram of a voltage type detection circuit structure according to another embodiment of the application;

[0051] FIG. 6 is a schematic diagram of a voltage type detection circuit structure according to another embodiment of the application;

[0052] FIG. 7 is a schematic diagram of a voltage type detection circuit structure according to another embodiment of the application.

[0053] Reference signs: 10, charging pile; 11, first relay; 12, second relay; 13, first fast charging relay; 14, second fast charging relay; 15, first slow charging relay; 16, second slow charging relay; 17, battery; 18, first voltage dividing resistor; 19, second voltage dividing resistor; 20, voltage processing module; 21, first resistor; 22, second resistor; 23, third resistor; 24, first capacitor; 25, clamping diode; 26, voltage stabilizing diode; 30, isolation optocoupler; 40, output module; 41, fourth resistor; 42, second capacitor. DETAILED DESCRIPTION

[0054] For the purposes of the present application, the technical solutions and advantages thereof will be more apparent from the following detailed description of the technical solutions in the present application, which will be made clear with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0055] The terms "first", "second", "third", "fourth" and the like in the specification and claims of the present application and the above-described accompanying drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances. For example, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information, without departing from the scope of the present application.

[0056] It should be understood that the terms "comprising", "including", "containing", "having" indicate the presence of the features, steps, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups.

[0057] The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B and / or C" means "any one of the following: A; B; C; A and B; A and C; B and C; A, B and C". There is an exception to this definition only when a combination of elements, functions, steps or operations is inherently mutually exclusive based on some way.

[0058] In practical applications, the charging gun of an electric vehicle can provide alternating current or direct current to meet different vehicle models and charging needs. Before starting charging, accurately detecting the voltage type of the charging energy source is of great significance to ensure the safety and efficiency of the charging process.

[0059] FIG. 1 is a schematic diagram of a charging circuit structure of an electric vehicle in the prior art. As shown in FIG. 1, the left side is the charging pile side, wherein the charging pile 10 can provide alternating current power or direct current power, and the first relay 11 and the second relay 12 are internal relays of the charging pile. The right side is the electric vehicle side, including an on-board charger (OBC), a first fast charging relay 13, a second fast charging relay 14, a first slow charging relay 15, a second slow charging relay 16, and an electric vehicle battery 17.

[0060] FIG. 2 is a schematic diagram of a voltage type detection circuit structure in the prior art. As shown in FIG. 2, in the prior art, for voltage type detection of the charging gun, a method of converting a large voltage into a small voltage through resistance division, isolation amplification is usually adopted. Specifically, first, the voltage output by the charging pile 10 is divided through the first voltage dividing resistor 18 and the second voltage dividing resistor 19 to obtain a voltage value suitable for subsequent processing. Then, the voltage after division is isolated and amplified by using isolation amplifiers IC1 and IC2 to avoid the influence of high voltage on the subsequent circuit. Next, the amplified voltage signal is input into a high-frequency analog-to-digital converter (ADC) chip for high-speed sampling and quantization processing to obtain a digitized voltage signal U0, and then the voltage type output by the charging pile 10 is judged through software calculation. Usually, the sampling speed can reach about 100KHz to meet the real-time detection requirement.

[0061] However, in the above voltage type detection circuit, the isolation amplification process can introduce additional errors and noise, affecting the accuracy of detection. The sampling speed and accuracy of the high-frequency ADC chip are limited by its hardware performance, which may not fully meet the real-time and high-precision detection requirements, and the cost is relatively high.

[0062] To solve the above problems, the present application provides a voltage type detection circuit, a battery, a charging interface and a vehicle. In the detection circuit, to avoid introducing additional errors and noise in the isolation amplification process, an isolation optocoupler is used instead, ensuring the electrical independence between the input and output circuits, effectively preventing electrical interference and signal crosstalk. On this basis, the output signal characteristics of the detection circuit are different when different voltage types are input, and the input voltage type is judged according to the output signal of the detection circuit, improving the voltage type detection efficiency and accuracy. The detection circuit uses simple electronic components, reducing the cost.

[0063] The technical solutions of the present application will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and some embodiments may not be described in detail for the same or similar concepts or processes.

[0064] Fig. 3 is a schematic diagram of a voltage type detection circuit according to an embodiment of the present application. As shown in Fig. 3, the embodiment provides a voltage type detection circuit for detecting the output voltage type of a charging pile 10, the charging pile 10 including a positive electrode and a negative electrode. The circuit includes a voltage processing module 20, an isolation optocoupler 30, and an output module 40.

[0065] The input end of the voltage processing module 20 is connected to the positive electrode of the charging pile 10, and the output end of the voltage processing module 20 is connected to the input end of the isolation optocoupler 30. The output end of the isolation optocoupler 30 is connected to the input end of the output module 40.

[0066] The voltage processing module 20 is configured to output a voltage signal according to the output voltage type of the charging pile 10, and the output voltage type of the charging pile 10 includes an AC source or a DC source.

[0067] The isolation optocoupler 30 is turned on or off under the control of the voltage signal, and the output module 40 outputs a voltage type signal under the control of the on or off of the isolation optocoupler 30.

[0068] In the embodiment, the voltage type signal output by the output module 40 has different forms when the output voltage type of the charging pile 10 is different. For example, when the output voltage type of the charging pile 10 is a DC source, the voltage type signal output by the output module 40 is high; when the output voltage type of the charging pile 10 is an AC source, the voltage type signal output by the output module 40 is low. For another example, when the output voltage type of the charging pile 10 is a DC source, the voltage type signal output by the output module 40 is low; when the output voltage type of the charging pile 10 is an AC source, the voltage type signal output by the output module 40 periodically changes.

[0069] The voltage type detection circuit provided by the embodiment sets the voltage processing module 20, the isolation optocoupler 30, and the output module 40. The voltage processing module 20 outputs a voltage signal according to the output voltage type of the charging pile 10, the isolation optocoupler 30 is turned on or off under the control of the voltage signal, and the output module 40 outputs a voltage type signal under the control of the on or off of the isolation optocoupler 30. The output voltage type of the charging pile 10 is determined according to the form of the voltage type signal. The detection circuit has a simple structure and can efficiently and accurately detect the voltage type of the charging pile 10. The use of multiple simple electronic components reduces the cost.

[0070] In some embodiments, the voltage processing module 20 is configured to output a first voltage signal when the charging pile 10 outputs AC power, the first voltage signal controlling the isolation optocoupler 30 to periodically turn on. The voltage processing module 20 is configured to output a second voltage signal when the charging pile 10 outputs DC power, the second voltage signal controlling the isolation optocoupler 30 to turn off or turn on.

[0071] The first voltage signal is an alternating current signal, the second voltage signal is a direct current signal, and the amplitude voltage of the first voltage signal is greater than the voltage of the second voltage signal.

[0072] Specifically, when the charging pile 10 outputs alternating current, the isolation optocoupler 30 is periodically turned on, and the voltage type signal output by the output module 40 periodically changes or is stably at a low level.

[0073] When the charging pile 10 outputs direct current, the isolation optocoupler 30 is disconnected, and the voltage type signal output by the output module 40 is at a low level.

[0074] When the charging pile 10 outputs direct current, the isolation optocoupler 30 is turned on, and the voltage type signal output by the output module 40 is at a high level.

[0075] It can be understood that when the output voltage type of the charging pile 10 is different, the voltage type signal output by the output module 40 is different.

[0076] FIG. 4 is a schematic structural diagram of a voltage type detection circuit according to an embodiment of the present application. As shown in FIG. 4, the voltage processing module 20 includes a first resistor 21, a second resistor 22, a third resistor 23, and a first capacitor 24.

[0077] The first end of the first resistor 21 is used to be connected with the positive pole of the charging pile 10, and the second end of the first resistor 21 is connected with the first terminal (point A in the figure) of the input end of the isolation optocoupler 30.

[0078] The first end of the second resistor 22 is used to be connected with the negative pole of the charging pile 10, and the second end of the second resistor 22 is connected with the first end of the third resistor 23.

[0079] The second end of the third resistor 23 is connected with the second terminal (point B in the figure) of the input end of the isolation optocoupler 30.

[0080] The first end of the first capacitor 24 is connected with the first end of the third resistor 23, and the second end of the first capacitor 24 is connected with the second end of the third resistor 23.

[0081] In the embodiment, the output module 40 includes a supply voltage VCC, and the voltage value at the output end of the isolation optocoupler 30 together determines that the output voltage type signal of the output module 40 is at a high level or a low level.

[0082] Optionally, in the embodiment, the first resistor 21 and the second resistor 22 are ohmic resistors, and the third resistor 23 is a mega-ohm resistor.

[0083] When the charging pile 10 outputs direct current, the charging pile 10, the first resistor 21, the diode on the left side of the isolation optocoupler 30, the third resistor 23 and the second resistor 22 form a loop. The direct current voltage is divided by the resistance sum of the first resistor 21, the second resistor 22 and the third resistor 23, and the current size does not meet the conduction condition of the isolation optocoupler 30, and the voltage type signal output by the output module 40 is high level.

[0084] When the charging pile 10 outputs alternating current, in the positive half cycle of the alternating current, the charging pile 10, the first resistor 21, the diode on the left side of the isolation optocoupler 30, the first capacitor 24 and the second resistor 22 form a loop. The direct current voltage is divided by the resistance sum of the first resistor 21 and the second resistor 22, and the current size meets the conduction condition of the isolation optocoupler 30, and the voltage type signal output by the output module 40 is low level. In the negative half cycle of the alternating current, the isolation optocoupler 30 cannot be turned on, and the voltage type signal output by the output module 40 is high level. The positive and negative cycles of the alternating current change periodically, and the voltage type signal output by the output module 40 changes periodically between high and low levels.

[0085] Therefore, by judging whether the voltage type signal output by the output module 40 is high level or changes periodically between high and low levels, the voltage type of the charging pile 10 can be determined.

[0086] Alternatively, in the embodiment, the first resistor 21 and the second resistor 22 are ohmic resistors, and the third resistor 23 is a kilo-ohm resistor.

[0087] When the charging pile 10 outputs direct current, the charging pile 10, the first resistor 21, the diode on the left side of the isolation optocoupler 30, the third resistor 23 and the second resistor 22 form a loop. The direct current voltage is divided by the resistance sum of the first resistor 21, the second resistor 22 and the third resistor 23, and the current size meets the conduction condition of the isolation optocoupler 30, and the voltage type signal output by the output module 40 is low level.

[0088] When the charging pile 10 outputs alternating current, in the positive half cycle of the alternating current, the charging pile 10, the first resistor 21, the diode on the left side of the isolation optocoupler 30, the first capacitor 24 and the second resistor 22 form a loop. The direct current voltage is divided by the resistance sum of the first resistor 21 and the second resistor 22, and the current size meets the conduction condition of the isolation optocoupler 30, and the voltage type signal output by the output module 40 is low level. In the negative half cycle of the alternating current, the isolation optocoupler 30 cannot be turned on, and the voltage type signal output by the output module 40 is high level. The positive and negative cycles of the alternating current change periodically, and the voltage type signal output by the output module 40 changes periodically between high and low levels.

[0089] Therefore, by judging whether the voltage type signal output by the output module 40 is low level or changes periodically between high and low levels, the voltage type of the charging pile 10 can be determined.

[0090] Figure 5 is a schematic diagram of a voltage type detection circuit structure according to an embodiment of the present application. As shown in Figure 5, the voltage processing module 20 comprises a first resistor 21, a third resistor 23 and a first capacitor 24.

[0091] The first end of the first resistor 21 is configured to be connected to the positive pole of the charging pile 10, and the second end of the first resistor 21 is connected to the first terminal of the input end of the isolation optocoupler 30.

[0092] The first end of the third resistor 23 is configured to be connected to the negative pole of the charging pile 10, and the second end of the third resistor 23 is connected to the second terminal of the input end of the isolation optocoupler 30.

[0093] The first end of the first capacitor 24 is connected to the first end of the third resistor 23, and the second end of the first capacitor 24 is connected to the second end of the third resistor 23.

[0094] Optionally, in the embodiment, the first resistor 21 is a kilo-ohm resistor, and the third resistor 23 is a mega-ohm resistor.

[0095] Figure 6 is a schematic diagram of a voltage type detection circuit structure according to an embodiment of the present application. As shown in Figure 6, the voltage processing module 20 comprises a second resistor 22, a third resistor 23 and a first capacitor 24.

[0096] The first terminal of the input end of the isolation optocoupler 30 is configured to be connected to the positive pole of the charging pile 10.

[0097] The first end of the second resistor 22 is configured to be connected to the negative pole of the charging pile 10, and the second end of the second resistor 22 is connected to the first end of the third resistor 23.

[0098] The second end of the third resistor 23 is connected to the second terminal of the input end of the isolation optocoupler 30.

[0099] The first end of the first capacitor 24 is connected to the first end of the third resistor 23, and the second end of the first capacitor 24 is connected to the second end of the third resistor 23.

[0100] Optionally, in the embodiment, the second resistor 22 is a kilo-ohm resistor, and the third resistor 23 is a mega-ohm resistor.

[0101] It should be understood that in the embodiments of Figures 5 and 6, the output voltage type of the charging pile 10 is different, and the voltage type signal output by the output module 40 also has different forms of expression, which can be understood with reference to the embodiment of Figure 4.

[0102] With reference still to Figures 4, 5 or 6, in some embodiments, the voltage processing module 20 further comprises a clamping diode 25. The first end of the clamping diode 25 is connected to the first terminal of the input end of the isolation optocoupler 30, and the second end of the clamping diode 25 is connected to the second terminal of the input end of the isolation optocoupler 30.

[0103] The clamping diode 25 can prevent leakage in the circuit and improve the safety of the circuit.

[0104] With reference to FIG. 4, FIG. 5 or FIG. 6, in some embodiments, the circuit further comprises a voltage stabilizing diode 26. A first end of the voltage stabilizing diode 26 is connected to the positive pole of the charging pile 10; a second end of the voltage stabilizing diode 26 is connected to the first terminal of the input end of the isolation optocoupler 30.

[0105] Specifically, the second end of the voltage stabilizing diode 26 is connected to the first end of the first resistor 21, and the second end of the first resistor 21 is connected to the first terminal of the input end of the isolation optocoupler 30. Alternatively, the second end of the voltage stabilizing diode 26 is directly connected to the first terminal of the input end of the isolation optocoupler 30.

[0106] The voltage stabilizing diode 26 is used for rectification when the charging pile 10 outputs alternating current, and ensures that the current is unidirectionally introduced into the circuit when the charging pile 10 outputs direct current.

[0107] With reference to FIG. 4, FIG. 5 or FIG. 6, in some embodiments, the output module 40 comprises a fourth resistor 41. A first end of the fourth resistor 41 is connected to the output end of the power supply voltage; a second end of the fourth resistor 41 is connected to the first terminal (point C in the figure) of the output end of the isolation optocoupler 30; and the second terminal (point D in the figure) of the output end of the isolation optocoupler 30 is grounded.

[0108] The fourth resistor 41 is used for limiting the current size of the output module 40 and protecting the circuit safety.

[0109] FIG. 7 is a schematic structural diagram of a voltage type detection circuit according to an embodiment of the present application. As shown in FIG. 7, on the basis of any of the foregoing embodiments, the output module 40 comprises a second capacitor 42.

[0110] A first end of the second capacitor 42 is connected to the first terminal of the output end of the isolation optocoupler 30; and a second end of the second capacitor 42 is connected to the second terminal of the output end of the isolation optocoupler 30.

[0111] Optionally, in the present embodiment, the first resistor 21 and the second resistor 22 are ohmic resistors, and the third resistor 23 is a mega-ohm resistor.

[0112] When the charging pile 10 outputs direct current, the charging pile 10, the first resistor 21, the diode on the left side of the isolation optocoupler 30, the third resistor 23 and the second resistor 22 form a loop. The direct current voltage is divided by the resistance sum of the first resistor 21, the second resistor 22 and the third resistor 23, and the current size does not satisfy the conduction condition of the isolation optocoupler 30, and the voltage type signal output by the output module 40 is high level.

[0113] When the charging pile 10 outputs alternating current, during the positive half cycle of the alternating current, the charging pile 10, the first resistor 21, the diode on the left side of the isolation optocoupler 30, the first capacitor 24 and the second resistor 22 form a loop. The direct current voltage is divided by the resistance sum of the first resistor 21 and the second resistor 22, the current size meets the conduction condition of the isolation optocoupler 30, and the voltage type signal output by the output module 40 is low. During the negative half cycle of the alternating current, the isolation optocoupler 30 cannot be turned on, the second capacitor 42 is in a charging state, and the voltage type signal output by the output module 40 is low. The positive and negative cycles of the alternating current change periodically, and the voltage type signal output by the output module 40 is low.

[0114] Therefore, by judging whether the voltage type signal output by the output module 40 is high or low, the output voltage type of the charging pile 10 can be determined.

[0115] The voltage type detection circuit provided by the embodiments of the present application uses relatively simple circuit components, reduces circuit complexity, reduces cost, avoids interference of the isolation amplification process on voltage detection, improves stability and reliability of the detection circuit, and improves accuracy of voltage detection.

[0116] The present application also provides a battery comprising the voltage type detection circuit in any of the preceding embodiments.

[0117] The present application also provides a charging interface comprising the voltage type detection circuit in any of the preceding embodiments.

[0118] The charging interface is a key component for supplementing energy of a power battery of an electric vehicle, and is used to connect with the charging pile through a charging line to charge the electric vehicle.

[0119] The voltage type detection circuit of the present application can be arranged in the power battery of the electric vehicle, or can be arranged in the charging interface of the electric vehicle, and is used to detect the output voltage type of the charging pile before charging the vehicle.

[0120] The present application also provides a vehicle comprising the battery or the charging interface in the preceding embodiments.

[0121] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features. The modification or replacement does not make the essence of the corresponding technical solution deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A voltage type detection circuit, characterized in that, The circuit is used to detect the output voltage type of the charging pile, which includes a positive terminal and a negative terminal; the circuit includes: a voltage processing module, an isolation optocoupler, and an output module; The input terminal of the voltage processing module is connected to the positive terminal of the charging pile, and the output terminal of the voltage processing module is connected to the input terminal of the isolation optocoupler; the output terminal of the isolation optocoupler is connected to the input terminal of the output module. The voltage processing module is used to output a voltage signal according to the output voltage type of the charging pile, wherein the output voltage type of the charging pile includes an AC source or a DC source. The isolation optocoupler is turned on or off under the control of the voltage signal, and the output module outputs a voltage type signal under the control of the turn-on or turn-off of the isolation optocoupler.

2. The circuit according to claim 1, characterized in that, The voltage processing module is used for: When the charging pile outputs AC power, it outputs a first voltage signal, which controls the isolation optocoupler to periodically conduct. When the charging pile outputs DC power, it outputs a second voltage signal, which controls the isolation optocoupler to open or close. Wherein, the first voltage signal is an AC signal, the second voltage signal is a DC signal, and the amplitude of the first voltage signal is greater than the voltage of the second voltage signal.

3. The circuit according to claim 1, characterized in that, The voltage processing module includes: a first resistor, a second resistor, a third resistor, and a first capacitor; The first end of the first resistor is used to connect to the positive terminal of the charging pile, and the second end of the first resistor is connected to the first terminal of the input terminal of the isolation optocoupler. The first end of the second resistor is used to connect to the negative terminal of the charging pile, and the second end of the second resistor is connected to the first end of the third resistor; The second end of the third resistor is connected to the second terminal of the input terminal of the isolation optocoupler; The first terminal of the first capacitor is connected to the first terminal of the third resistor, and the second terminal of the first capacitor is connected to the second terminal of the third resistor.

4. The circuit according to claim 1, characterized in that, The voltage processing module includes: a first resistor, a third resistor, and a first capacitor; The first end of the first resistor is used to connect to the positive terminal of the charging pile, and the second end of the first resistor is connected to the first terminal of the input terminal of the isolation optocoupler. The first end of the third resistor is used to connect to the negative terminal of the charging pile, and the second end of the third resistor is connected to the second terminal of the isolation optocoupler input terminal. The first terminal of the first capacitor is connected to the first terminal of the third resistor, and the second terminal of the first capacitor is connected to the second terminal of the third resistor.

5. The circuit according to claim 1, characterized in that, The voltage processing module includes: a second resistor, a third resistor, and a first capacitor; The first terminal of the isolation optocoupler input is used to connect to the positive terminal of the charging pile; The first end of the second resistor is used to connect to the negative terminal of the charging pile, and the second end of the second resistor is connected to the first end of the third resistor; The second end of the third resistor is connected to the second terminal of the input terminal of the isolation optocoupler; The first terminal of the first capacitor is connected to the first terminal of the third resistor, and the second terminal of the first capacitor is connected to the second terminal of the third resistor.

6. The circuit according to any one of claims 3 to 5, characterized in that, The voltage processing module also includes a clamping diode; The first end of the clamping diode is connected to the first terminal of the input end of the isolation optocoupler; The second terminal of the clamping diode is connected to the second terminal of the input terminal of the isolation optocoupler.

7. The circuit according to any one of claims 3 to 5, characterized in that, The circuit also includes a Zener diode; The first terminal of the Zener diode is used to connect to the positive terminal of the charging pile; The second terminal of the Zener diode is connected to the first terminal of the input terminal of the isolation optocoupler.

8. The circuit according to any one of claims 1 to 5, characterized in that, The output module includes a fourth resistor; The first end of the fourth resistor is connected to the output end of the power supply voltage; The second terminal of the fourth resistor is connected to the first terminal of the output terminal of the isolation optocoupler; the second terminal of the output terminal of the isolation optocoupler is grounded.

9. The circuit according to any one of claims 1 to 5, characterized in that, The output module includes a second capacitor; The first terminal of the second capacitor is connected to the first terminal of the output terminal of the isolation optocoupler; The second terminal of the second capacitor is connected to the second terminal of the output terminal of the isolation optocoupler.

10. A battery, characterized in that, The battery includes a voltage type detection circuit as described in any one of claims 1 to 9.

11. A charging interface, characterized in that, The charging interface includes a voltage type detection circuit as described in any one of claims 1 to 9.

12. A vehicle, characterized in that, The vehicle includes the battery as described in claim 10 or the charging interface as described in claim 11.

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