Charging detection circuit, charging system and energy storage device

Abstract

The utility model provides a charging detection circuit, a charging system and an energy storage device. The circuit comprises a first state detection sub-circuit, a second state detection sub-circuit and a controller. The first state detection sub-circuit is used for outputting a first level signal to the controller according to the negative electrode input voltage of the charging interface; the second state detection sub-circuit is used for outputting a second level signal to the controller according to the positive electrode input voltage of the charging interface; and after receiving the first level signal and the second level signal, the controller outputs an AC / DC charging state detection result according to the level states of the first level signal and the second level signal. According to the scheme provided by the utility model, the AC / DC charging state can be detected according to the input voltage conditions of the positive and negative electrodes of the charging interface, whether the input voltage of the charging interface accords with the AC charging state or the DC charging state is automatically detected, the current charging mode can be automatically detected without manual selection of a user, and the charging function is more perfect.

Description

Technical Field

[0001] The utility model relates to the technical field of battery charging, and in particular to a charging detection circuit, a charging system and an energy storage device. Background Art

[0002] At present, vehicle charging systems usually support two charging methods: DC charging and AC charging. The charging link can reasonably select one of the charging methods according to the charging facilities. At the same time, considering that the two charging ports, DC charging interface and AC charging interface, have a relatively complex structure, after simplifying the charging interface, an integrated charging interface that can realize AC and DC charging at the same time has been maturely applied.

[0003] In the related art, the integrated charging interface is usually used by the user to independently select the charging method by operating buttons. In this case, the charging method selection cannot be realized automatically and can only rely on manual selection. The charging process is not convenient enough and the functions are not perfect enough. Utility Model Content

[0004] The utility model provides a charging detection circuit, a charging system and an energy storage device, which are used to solve the defects that the process of selecting a charging mode of a traditional integrated charging interface needs to be completed by manual control, the operation is not convenient enough and the functions are not perfect enough.

[0005] In one aspect, the utility model provides a charging detection circuit, comprising: a first state detection subcircuit, a second state detection subcircuit and a controller;

[0006] The controller is connected to the first state detection subcircuit and the second state detection subcircuit respectively, and the first state detection subcircuit and the second state detection subcircuit are both connected to the charging interface;

[0007] The first state detection subcircuit is used to output a first level signal to the controller according to the negative input voltage of the charging interface;

[0008] The second state detection subcircuit is used to output a second level signal to the controller according to the positive input voltage of the charging interface;

[0009] After receiving the first level signal and the second level signal, the controller outputs an AC / DC charging state detection result according to the level states of the first level signal and the second level signal.

[0010] According to the charging detection circuit provided by the utility model, the first state detection subcircuit includes: a first switch tube and a first optical coupling module;

[0011] The first end of the first switch tube is connected to the first optical coupling module, the second end of the first switch tube is connected to the controller, and the third end of the first switch tube is grounded;

[0012] The first optical coupling module is also connected to the charging interface and the controller.

[0013] According to the charging detection circuit provided by the utility model, the first optical coupling module includes: a first optical coupling switch and a second optical coupling switch;

[0014] The first optocoupler switch is connected to the first switch tube, the second optocoupler switch and the negative electrode of the charging interface respectively, and the second optocoupler switch is connected to the controller and the positive electrode of the charging interface respectively.

[0015] According to the charging detection circuit provided by the utility model, the second state detection subcircuit includes: a second switch tube and a second optical coupling module;

[0016] The first end of the second switch tube is connected to the second optical coupling module, the second end of the second switch tube is connected to the controller, and the third end of the second switch tube is grounded;

[0017] The second optical coupling module is also connected to the charging interface and the controller.

[0018] According to the charging detection circuit provided by the utility model, the second optical coupling module includes a third optical coupling switch and a fourth optical coupling switch;

[0019] The third optocoupler switch is respectively connected to the second switch tube, the fourth optocoupler switch and the positive electrode of the charging interface, and the fourth optocoupler switch is respectively connected to the controller and the negative electrode of the charging interface.

[0020] According to the charging detection circuit provided by the utility model, the circuit further includes: a voltage collection subcircuit;

[0021] The voltage collection subcircuit is respectively connected to the positive and negative electrodes of the charging interface and the controller;

[0022] The voltage acquisition subcircuit is used to acquire the input voltage of the charging interface and send the input voltage of the charging interface to the controller.

[0023] According to the charging detection circuit provided by the utility model, the voltage acquisition subcircuit includes: an amplification module and an ADC sampling chip;

[0024] The amplification module is respectively connected to the positive electrode and the negative electrode of the charging interface and the ADC sampling chip, and the ADC sampling chip is connected to the controller.

[0025] According to the charging detection circuit provided by the utility model, the amplification module includes: an operational amplifier, a first resistor, a second resistor, a third resistor and a fourth resistor;

[0026] The first input end of the operational amplifier is connected to the positive electrode of the charging interface through the first resistor, the second input end of the operational amplifier is connected to the negative electrode of the charging interface through the second resistor, the output end of the operational amplifier is connected to the ADC sampling chip, and the output end of the operational amplifier is also grounded through the third resistor and the fourth resistor.

[0027] On the other hand, the utility model further provides a charging system, comprising any one of the charging detection circuits described above.

[0028] On the other hand, the utility model also provides an energy storage device, comprising any one of the above-mentioned charging detection circuits or the above-mentioned charging systems.

[0029] The charging detection circuit, charging system and energy storage device provided by the utility model are provided with a first state detection subcircuit, a second state detection subcircuit and a controller. The first state detection subcircuit outputs a first level signal to the controller according to the negative input voltage of the charging interface, and the second state detection subcircuit outputs a second level signal to the controller according to the positive input voltage of the charging interface. The controller outputs the AC and DC charging state detection result according to the level state of the first level signal and the second level signal. Due to the setting of the charging detection circuit, the detection of the AC and DC charging state can be realized according to the positive and negative input voltage conditions of the charging interface, and the current input voltage of the charging interface can be automatically detected to meet the AC charging state or the DC charging state, so that the current charging mode can be automatically detected without manual selection by the user, making the charging process function more perfect, and solving the problem that the process of realizing the selection of the charging mode of the traditional integrated charging interface needs to be completed by manual control, the operation is not convenient enough, and the function is not perfect enough. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 is a schematic diagram of the principle of DC charging and AC charging of the battery pack through the integrated charging interface;

[0032] Figure 2 It is a structural schematic diagram of a charging detection circuit provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] This embodiment relates to the field of battery charging, and can be specifically applied to a scenario where an integrated charging interface is used to charge a battery pack. At present, the integrated charging interface has been maturely applied, such as the NACS interface. Compared with the structural design using two charging interfaces, the integrated charging interface can save space for wiring harness layout and simplify the charging interface structure. Figure 1 FIG. 4 shows a scenario of DC charging and AC charging of a battery pack PACK through an integrated charging interface P. Figure 1 As shown, the integrated charging interface P can be connected to any charging pile in the charging station, that is, the DC charging of the battery pack PACK is realized through the L1 DC line, and the integrated charging interface P can also be connected to household electricity, that is, the AC charging of the battery pack PACK is realized through the L2 AC line using the on-board charger OBC.

[0035] However, when charging the battery pack using the integrated charging interface, the user usually manually selects the charging method. For example, the user can select DC charging or AC charging through the relevant control button. This method is not convenient enough and cannot realize automatic detection of the charging method, resulting in incomplete charging process functions.

[0036] In view of the above technical problems, the embodiments of the present invention provide corresponding solutions. Figure 2 The detailed scheme of the charging detection circuit, charging system and energy storage device provided by the embodiments of the utility model is described.

[0037] Figure 2 It is a structural schematic diagram of a charging detection circuit provided in an embodiment of the utility model.

[0038] like Figure 2 As shown, the charging detection circuit provided in the embodiment of the utility model can be applied to an AC / DC charging circuit for charging a battery pack PACK through an integrated charging interface P. The circuit specifically includes: a first state detection subcircuit 110, a second state detection subcircuit 120 and a controller U1.

[0039] The controller U1 is connected to the first state detection subcircuit 110 and the second state detection subcircuit 120 respectively. The first state detection subcircuit 110 and the second state detection subcircuit 120 are both connected to the charging interface P.

[0040] The first state detection sub-circuit 110 is used to output a first level signal V1 to the controller U1 according to the negative input voltage L of the charging interface P.

[0041] The second state detection sub-circuit 120 is used to output a second level signal V2 to the controller U1 according to the positive input voltage of the charging port P.

[0042] After receiving the first level signal V1 and the second level signal V2, the controller U1 outputs the AC / DC charging state detection result according to the level states of the first level signal V1 and the second level signal V2.

[0043] In this embodiment, the level state of the first level signal V1 can represent the voltage state of the positive input voltage of the charging interface P, and the level state of the second level signal V2 can represent the voltage state of the negative input voltage of the charging interface P. Then, the automatic detection of the AC and DC charging states can be realized according to the level states of the first level signal V1 and the second level signal V2.

[0044] In one embodiment, see Figure 2 The first state detection sub-circuit 110 specifically includes: a first switch tube Q1 and a first optical coupler module.

[0045] A first end of the first switch tube Q1 is connected to the first optical coupling module, a second end of the first switch tube Q1 is connected to the controller U1, and a third end of the first switch tube Q1 is grounded.

[0046] The first optical coupling module is also connected to the charging interface P and the controller U1.

[0047] like Figure 2 As shown, the second end of the first switch tube Q1 is connected to the controller U1 through the fifth resistor R4, and the second end of the first switch tube Q1 is grounded through the sixth resistor R5.

[0048] Further, see Figure 2 , the first optical coupling module specifically includes: a first optical coupling switch K1 and a second optical coupling switch K2;

[0049] The first optocoupler switch K1 is connected to the first switch tube Q1 , the second optocoupler switch Q2 and the negative electrode of the charging interface P respectively, and the second optocoupler switch Q2 is connected to the controller U1 and the positive electrode of the charging interface P respectively.

[0050] like Figure 2As shown, the first optocoupler switch K1 is connected to the VCC terminal through the seventh resistor R6, the second optocoupler switch K2 is connected to the VCC terminal through the eighth resistor R7, and is connected to the controller U1 through the ninth resistor R8. At the same time, the second optocoupler switch K2 is also connected to the positive electrode of the charging interface P through a series branch consisting of the tenth resistor R1, the eleventh resistor R2 and the twelfth resistor R3.

[0051] In one embodiment, see Figure 2 The second state detection sub-circuit specifically includes: a second switch tube Q2 and a second optical coupler module.

[0052] A first end of the second switch tube Q2 is connected to the second optical coupling module, a second end of the second switch tube Q2 is connected to the controller U1, and a third end of the second switch tube Q2 is grounded.

[0053] The second optical coupling module is also connected to the charging interface P and the controller U1.

[0054] Further, see Figure 2 The second optical coupling module specifically includes a third optical coupling switch K3 and a fourth optical coupling switch K4.

[0055] The third optical coupler switch K3 is connected to the second switch tube Q2 , the fourth optical coupler switch K4 and the positive electrode of the charging interface P respectively, and the fourth optical coupler switch K4 is connected to the controller U1 and the negative electrode of the charging interface P respectively.

[0056] like Figure 2 As shown, the third optocoupler switch K3 is specifically connected to the VCC terminal through the thirteenth resistor R13, the second end of the second switch tube Q2 is connected to the controller U1 through the fourteenth resistor R14, the second end of the second switch tube Q2 is grounded through the fifteenth resistor R15, the fourth optocoupler switch K4 is respectively connected to the controller U1 and the VCC terminal through the sixteenth resistor R16 and the seventeenth resistor R7, and the fourth optocoupler switch K4 is also connected to the negative electrode of the charging interface P through a series branch consisting of an eighteenth resistor R18, a nineteenth resistor R19 and a twentieth resistor R20.

[0057] In one embodiment, see Figure 2 The above charging detection circuit may further include: a voltage acquisition subcircuit 130.

[0058] The voltage collection subcircuit 130 is connected to the positive and negative electrodes of the charging interface P and the controller U1 respectively.

[0059] The voltage collection subcircuit 130 is used to collect the input voltage of the charging interface P and send the input voltage of the charging interface P to the controller U1.

[0060] Further, see Figure 2, the voltage acquisition sub-circuit 130 specifically includes: an amplification module and an ADC sampling chip;

[0061] The amplification module is respectively connected to the positive and negative electrodes of the charging interface P and the ADC sampling chip, and the ADC sampling chip is connected to the controller U1.

[0062] It should be noted that in order to make the circuit connection structure clearer, Figure 2 Only the location of the ADC sampling chip is shown (i.e. Figure 2 ADC in the figure), the ADC sampling chip is not shown to be connected to the controller U1. In actual application, the ADC sampling chip is connected to the controller U1 and can send the collected input voltage and other signals to the controller U1.

[0063] In one embodiment, see Figure 2 The amplification module specifically includes: an operational amplifier U2, a first resistor R9, a second resistor R10, a third resistor R11 and a fourth resistor R12.

[0064] The first input end of the operational amplifier U2 is connected to the positive electrode of the charging interface P through the first resistor R9, the second input end of the operational amplifier U2 is connected to the negative electrode of the charging interface P through the second resistor R10, the output end of the operational amplifier U2 is connected to the ADC sampling chip, and the output end of the operational amplifier U2 is also grounded through the third resistor R11 and the fourth resistor R12.

[0065] Combine the following Figure 2 The working principle of the charging detection circuit provided in this embodiment is described as follows:

[0066] In the normal non-charging state, the first switch S1, the second switch S2, the positive switch S3, the negative switch S4, the first switch tube Q1 and the second switch tube Q2 are all disconnected, and the entire AC / DC charging circuit does not form a path.

[0067] When performing AC / DC charging detection, the first switch tube Q1 and the second switch tube Q2 are closed, and a charging detection circuit forms a path.

[0068] After the detection starts, if the controller U1 detects that the first level signal V1 and the second level signal V2 are in alternating high and low level states, for example, when the charging interface P is connected to AC power, the positive input voltage L of the charging interface P is a high voltage, and the negative input voltage N of the charging interface P is a low voltage, the second switch tube Q2 is turned on and the first switch tube Q1 is turned off, then the first level signal V1 is in a low level state, and the second level signal V2 is in a high level state; when the positive input voltage L of the charging interface P is a low voltage, and the negative input voltage N of the charging interface P is a high voltage, the second switch tube Q2 is turned off and the first switch tube Q1 is turned on, then the first level signal V1 is in a high level state, and the second level signal V2 is in a low level state, thereby forming a symmetrical circuit.

[0069] In this case, when the controller U1 detects that the first level signal V1 and the second level signal V2 are alternating between high and low level states, the controller U1 outputs the AC / DC charging state detection result as the AC charging state. At this time, the on-board charger OBC is started, and the first switch S1 and the second switch S2 are closed, thereby performing AC charging for the battery pack PACK.

[0070] If the controller U1 detects that the first level signal V1 is always in a low level state and the second level signal V2 is always in a high level state, the AC / DC charging state detection result output by the controller U1 is a DC charging state. At this time, the on-board charger OBC is turned off, and the first switch S1, the second switch S2, the positive switch S3 and the negative switch S4 are closed, so as to perform DC charging for the battery pack PACK.

[0071] At the same time, in order to ensure the safety of the DC charging link, the controller U1 also makes further control actions based on whether the input voltage collected by the ADC sampling chip is close to the voltage of the battery pack PCAK. Specifically, if the input voltage collected by the ADC sampling chip is close to the voltage of the battery pack PCAK, the first switch S1, the second switch S2, the positive switch S3 and the negative switch S4 are closed; if the input voltage collected by the DC sampling chip is not close to the voltage of the battery pack PCAK, the above switches are not closed to prevent contactor adhesion.

[0072] If the controller U1 detects that both the first level signal V1 and the second level signal V2 are always in a high level state, it can be determined that the vehicle end is not charging and the charging interface has no power supply voltage connected.

[0073] To sum up, the charging detection circuit provided in this embodiment can realize the detection of AC and DC charging status according to the positive and negative input voltage conditions of the charging interface, and automatically detect whether the current input voltage of the charging interface conforms to the AC charging state or the DC charging state, thereby automatically detecting the current charging mode without the need for manual selection by the user, thereby making the charging process function more complete.

[0074] In addition, an embodiment of the utility model further provides a charging system, which uses an integrated charging interface to charge a battery pack and includes the charging detection circuit provided in the above embodiments.

[0075] In addition, an embodiment of the utility model further provides an energy storage device, which includes the charging detection circuit provided in the above embodiments or the above charging system.

[0076] In practical applications, the energy storage device can be a vehicle, operating machinery, etc.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A charging detection circuit, characterized in that: include: A first state detection subcircuit, a second state detection subcircuit and a controller; The controller is connected to the first state detection subcircuit and the second state detection subcircuit respectively, and the first state detection subcircuit and the second state detection subcircuit are both connected to the charging interface; The first state detection subcircuit is used to output a first level signal to the controller according to the negative input voltage of the charging interface; The second state detection subcircuit is used to output a second level signal to the controller according to the positive input voltage of the charging interface; After receiving the first level signal and the second level signal, the controller outputs an AC / DC charging state detection result according to the level states of the first level signal and the second level signal.

2. The charging detection circuit according to claim 1, characterized in that: The first state detection subcircuit includes: a first switch tube and a first optical coupler module; The first end of the first switch tube is connected to the first optical coupling module, the second end of the first switch tube is connected to the controller, and the third end of the first switch tube is grounded; The first optical coupling module is also connected to the charging interface and the controller.

3. The charging detection circuit according to claim 2, characterized in that: The first optical coupling module includes: a first optical coupling switch and a second optical coupling switch; The first optocoupler switch is connected to the first switch tube, the second optocoupler switch and the negative electrode of the charging interface respectively, and the second optocoupler switch is connected to the controller and the positive electrode of the charging interface respectively.

4. The charging detection circuit according to claim 1, characterized in that: The second state detection subcircuit includes: a second switch tube and a second optical coupler module; The first end of the second switch tube is connected to the second optical coupling module, the second end of the second switch tube is connected to the controller, and the third end of the second switch tube is grounded; The second optical coupling module is also connected to the charging interface and the controller.

5. The charging detection circuit according to claim 4, characterized in that: The second optical coupling module includes a third optical coupling switch and a fourth optical coupling switch; The third optocoupler switch is respectively connected to the second switch tube, the fourth optocoupler switch and the positive electrode of the charging interface, and the fourth optocoupler switch is respectively connected to the controller and the negative electrode of the charging interface.

6. The charging detection circuit according to claim 1, characterized in that: The circuit further comprises: a voltage acquisition subcircuit; The voltage collection subcircuit is respectively connected to the positive and negative electrodes of the charging interface and the controller; The voltage acquisition subcircuit is used to acquire the input voltage of the charging interface and send the input voltage of the charging interface to the controller.

7. The charging detection circuit according to claim 6, characterized in that: The voltage acquisition subcircuit includes: an amplification module and an ADC sampling chip; The amplification module is respectively connected to the positive electrode and the negative electrode of the charging interface and the ADC sampling chip, and the ADC sampling chip is connected to the controller.

8. The charging detection circuit according to claim 7, characterized in that: The amplification module includes: an operational amplifier, a first resistor, a second resistor, a third resistor and a fourth resistor; The first input end of the operational amplifier is connected to the positive electrode of the charging interface through the first resistor, the second input end of the operational amplifier is connected to the negative electrode of the charging interface through the second resistor, the output end of the operational amplifier is connected to the ADC sampling chip, and the output end of the operational amplifier is also grounded through the third resistor and the fourth resistor.

9. A charging system, characterized in that: The invention comprises a charging detection circuit as claimed in any one of claims 1 to 8.

10. An energy storage device, characterized in that: The charging detection circuit comprises the charging detection circuit according to any one of claims 1 to 8 or the charging system according to claim 9.

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