Charging control circuit and vehicle

Abstract

The invention relates to a charging control circuit and a vehicle, and the charging control circuit comprises a switching circuit which is connected between a power supply circuit and a battery; the sampling circuit is electrically connected with the switching circuit and is used for collecting a voltage value corresponding to the current of a charging path between the power supply circuit and the battery; the voltage driving circuit is electrically connected with the sampling circuit, and the voltage driving circuit generates driving voltage based on a voltage value corresponding to the current of the charging path; the voltage driving circuit is further electrically connected with the switching circuit, the switching circuit is used for switching on or switching off a charging path based on the driving voltage, and the charging path is a path between the power supply circuit and the battery. When the current in the circuit is abnormal, the driving voltage is also abnormal, and the switching circuit can turn off the charging path between the power supply circuit and the battery based on the abnormal driving voltage. According to the embodiment of the invention, the charging path is turned off in time when the current in the charging path is abnormal, so that the battery, the charging path and the power supply circuit are prevented from being damaged.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicle technology, and in particular to a charging control circuit and a vehicle. Background Art

[0002] Existing electric vehicles generally charge their batteries through a DC-DC converter during the charging process. During the charging process, the voltage (or current) of the circuit may be abnormal. When the voltage (or current) is too high, it is easy to damage the charging circuit and the battery.

[0003] There are some solutions in the prior art that read the current sampling value through the MCU (Microcontroller Unit) and control the on and off of the charging path through the MCU. However, this solution is essentially a software processing method, which belongs to an application program. After obtaining the current in the charging path, it still takes a certain amount of time to execute the application program to turn off the circuit, which is inefficient.

[0004] Therefore, an effective and fast method is needed to quickly handle the abnormal voltage (or current) during the charging process to protect the circuit and the battery. Summary of the invention

[0005] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a charging control circuit and a vehicle.

[0006] In a first aspect, the present disclosure provides a charging control circuit, comprising:

[0007] A switch circuit, wherein the switch circuit is connected between the power supply circuit and the battery;

[0008] a sampling circuit, the sampling circuit being electrically connected to the switch circuit and used for collecting a voltage value corresponding to a current in a charging path between the power supply circuit and the battery;

[0009] A voltage driving circuit, the voltage driving circuit is electrically connected to the sampling circuit, the voltage driving circuit generates a driving voltage based on a voltage value corresponding to the current in the charging path; the voltage driving circuit is also electrically connected to the switching circuit, the switching circuit is used to turn on or off the charging path based on the driving voltage, the charging path is a path between the power supply circuit and the battery.

[0010] Optionally, the switch circuit includes a plurality of switch sub-circuits connected in parallel; each of the switch sub-circuit includes at least one switch element.

[0011] Optionally, the sampling circuit includes an adder and a plurality of sampling sub-circuits; the plurality of sampling sub-circuits correspond one-to-one to the plurality of switch sub-circuits; the sampling sub-circuit is used to collect a voltage value corresponding to the current of the corresponding switch sub-circuit;

[0012] The adder is electrically connected to the plurality of sampling sub-circuits, and is used for performing addition operation on the voltage values ​​collected by the plurality of sampling sub-circuits, and sending the addition operation result to the voltage driving circuit.

[0013] Optionally, the sampling subcircuit includes a first resistor and a first amplifier;

[0014] The first resistor is connected between the power supply circuit and the battery, the first input end of the first amplifier is connected to the first end of the first resistor, the second input end of the first amplifier is connected to the second end of the first resistor, and the output end of the first amplifier is connected to the adder.

[0015] Optionally, the adder includes a second amplifier, a second resistor and a third resistor;

[0016] The first input end of the second amplifier is connected to the plurality of sampling sub-circuits, and the output end of the second amplifier is connected to the voltage driving circuit;

[0017] A first end of the second resistor is connected to a second input end of the second amplifier, and a second end of the second resistor is grounded;

[0018] A first end of the third resistor is connected to a second input end of the second amplifier, and a second end of the third resistor is connected to an output end of the second amplifier.

[0019] Optionally, the voltage driving circuit includes a charge pump subcircuit, and the charge pump subcircuit is used to amplify a voltage value corresponding to the current of the charging path to generate the driving voltage.

[0020] Optionally, the voltage driving circuit further includes a voltage dividing sub-circuit, and the voltage dividing sub-circuit is used to divide the driving voltage output by the charge pump sub-circuit.

[0021] Optionally, the voltage driving circuit includes a charge pump subcircuit, and the charge pump subcircuit is electrically connected to the switching elements in all the switch subcircuits.

[0022] Optionally, the voltage driving circuit includes a first charge pump subcircuit and a second charge pump subcircuit, and the first charge pump subcircuit and the second charge pump subcircuit are both electrically connected to the sampling circuit;

[0023] Each of the switch sub-circuits includes a first switch element and a second switch element, and the first switch element and the second switch element are connected in series, each of the first switch elements is electrically connected to the first voltage driving circuit, and each of the second switch elements is electrically connected to the second voltage driving circuit.

[0024] In a second aspect, the present disclosure further provides a vehicle, comprising a charging control circuit as described in any one of the first aspects.

[0025] Based on the charging control circuit provided by the present disclosure, the voltage value corresponding to the current in the circuit can be obtained in real time during the process of the power supply circuit charging the battery, and the driving voltage can be generated based on the voltage value, that is, the current in the circuit and the driving voltage correspond in real time. When the current in the circuit is abnormal, the driving voltage is also abnormal. The switch circuit can cut off the charging path between the power supply circuit and the battery based on the abnormal driving voltage. In summary, the present disclosure can monitor the process of the power supply circuit charging the battery in real time, and cut off the charging path in time when the current in the charging path is abnormal, so as to prevent damage to the battery, the charging path and the power supply circuit, and ensure the safety of the charging process. In the embodiment of the present disclosure, the conduction or disconnection of the charging path is controlled only by hardware, and there is no need to execute a specific application program, thereby saving a certain amount of time, and the charging path can be cut off at a faster rate when there is an abnormality in the charging path. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a charging control circuit structure provided by an embodiment of the present disclosure;

[0027] Figure 2 A schematic diagram of another charging control circuit structure provided by an embodiment of the present disclosure;

[0028] Figure 3 A schematic diagram of another charging control circuit structure provided by an embodiment of the present disclosure;

[0029] Figure 4 A schematic diagram of another charging control circuit structure provided by an embodiment of the present disclosure;

[0030] Figure 5 A schematic diagram of another charging control circuit structure provided by an embodiment of the present disclosure;

[0031] Figure 6 A schematic diagram of another charging control circuit structure provided by an embodiment of the present disclosure;

[0032] Figure 7 A schematic diagram of another charging control circuit structure provided by an embodiment of the present disclosure;

[0033] Figure 8A schematic diagram of another charging control circuit structure provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0034] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0035] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0036] The charging control circuit and the vehicle provided in the embodiments of the present disclosure are exemplarily described below with reference to the accompanying drawings.

[0037] Figure 1 A schematic diagram of a charging control circuit structure provided in an embodiment of the present disclosure includes:

[0038] A switch circuit 100, the switch circuit 100 is connected between the power supply circuit 400 and the battery 500; a sampling circuit 200, the sampling circuit 200 is electrically connected to the switch circuit 100, and is used to collect the voltage value corresponding to the current of the charging path between the power supply circuit 400 and the battery 500; a voltage drive circuit 300, the voltage drive circuit 300 is electrically connected to the sampling circuit 200, and the voltage drive circuit 300 generates a drive voltage based on the voltage value corresponding to the current of the charging path; the voltage drive circuit 300 is also electrically connected to the switch circuit 100, and the switch circuit 100 is used to turn on or off the charging path based on the drive voltage, and the charging path is the path between the power supply circuit 400 and the battery 500.

[0039] For example, during the process of the power supply circuit 400 charging the battery 500 in the vehicle, the current (or voltage) provided to the battery 500 is generally maintained within a certain range. If the current (or voltage) is too high, it may cause damage to the battery 500, the charging path and the power supply circuit 400, and even cause a fire. Therefore, it is necessary to monitor the charging process of the battery 500 so as to shut off the charging path in time when the current (or voltage) is abnormal during the charging process to protect the battery 500, the power supply circuit 400 and the charging path.

[0040] The switch circuit 100 represents a functional circuit for controlling the on / off of the power supply circuit 400 and the battery 500, the sampling circuit 200 represents a functional circuit for obtaining a voltage value corresponding to a current in a charging path between the power supply circuit 400 and the battery 500, and the voltage drive circuit 300 represents a functional circuit for generating a drive voltage based on the collected voltage value to actually control the on / off of the switch circuit 100.

[0041] Therefore, since the voltage value corresponding to the current in the circuit can be obtained in real time during the process of the power supply circuit 400 charging the battery 500, and the driving voltage can be generated based on the voltage value, that is, the current in the circuit and the driving voltage correspond in real time, when the current in the circuit is abnormal, the driving voltage is also abnormal, and the switch circuit 100 can shut off the charging path between the power supply circuit 400 and the battery 500 based on the abnormal driving voltage. In summary, the present disclosure can monitor the process of the power supply circuit 400 charging the battery 500 in real time, and shut off the charging path in time when the current in the charging path is abnormal, so as to prevent damage to the battery 500, the charging path and the power supply circuit 400, and ensure the safety of the charging process. In the embodiment of the present disclosure, the conduction or disconnection of the charging path is controlled only by hardware, and there is no need to execute a specific application program, thereby saving a certain amount of time, and the charging path can be shut off at a faster rate when there is an abnormality in the charging path.

[0042] Exemplarily, the voltage value collected by the sampling circuit 200 is aV (voltage unit: volt), and the voltage driving circuit 300 can generate a driving voltage bV based on aV and output it to the switch circuit 100. The switch circuit 100 can be a forced functional circuit of the nature of a fuse, that is, it does not require a judgment process, but automatically shuts off the charging path between the power supply circuit 400 and the battery 500 after receiving a driving voltage reaching a certain specific value. For example, a certain voltage threshold can be set, and the switch circuit 100 is set corresponding to the voltage threshold. When the driving voltage received by the switch circuit 100 reaches the voltage threshold, the switch circuit 100 automatically shuts down.

[0043] Figure 2 A schematic diagram of another charging control circuit structure provided for an embodiment of the present disclosure; in some embodiments, the switch circuit 100 includes a plurality of switch sub-circuits 101 connected in parallel; each switch sub-circuit 101 includes at least one switch element 102.

[0044] For example, in the process of the power supply circuit 400 charging the battery 500, in order to achieve higher charging efficiency, the current during charging is generally large, and a single circuit cannot withstand too high a current, so the battery 500 is generally charged through multiple parallel charging paths. The switch circuit 100 in the embodiment of the present disclosure may include multiple parallel switch sub-circuits 101, that is, the number of switch sub-circuits 101 may correspond to the number of charging paths one by one, such as Figure 2 As shown, for example, if there are n charging paths in total, the switch sub-circuit 101 may include n switch sub-circuits, and the switch elements 102 may also include at least n switch elements 102. Each switch sub-circuit 101 controls the conduction or disconnection of a charging path. Each switch sub-circuit 101 includes at least one switch element 102. The switch element 102 can be used to control the conduction or disconnection of the charging path between the power supply circuit 400 and the battery 500.

[0045] Figure 3 A schematic diagram of another charging control circuit structure provided in an embodiment of the present disclosure; in some embodiments, the sampling circuit 200 includes an adder 201 and multiple sampling sub-circuits 202; the multiple sampling sub-circuits 202 correspond one-to-one to the multiple switch sub-circuits 101; the sampling sub-circuit 202 is used to collect the voltage value corresponding to the current of the corresponding switch sub-circuit 101; the adder 201 is electrically connected to the multiple sampling sub-circuits 202, and is used to add the voltage values ​​collected by the multiple sampling sub-circuits 202, and send the addition result to the voltage driving circuit 300.

[0046] Exemplarily, in order to collect the voltage value of each charging path, the sampling circuit 200 may include multiple sampling sub-circuits 202, each sampling sub-circuit 202 is used to collect the voltage value of each charging path. For example, the charging paths may include n numbers, and n sampling sub-circuits 202 may be set to collect the voltage value corresponding to the current in each charging path respectively. The collected voltage values ​​may be V1, V2, V3...Vn. Then, the collected voltage values ​​may be added by the adder 201 and the addition result may be sent to the voltage driving circuit 300. For example, the addition result may be V1+V2+V3+...+Vn, that is, it may be the driving voltage.

[0047] Figure 4 A schematic diagram of another charging control circuit structure provided for an embodiment of the present disclosure; in some embodiments, the sampling subcircuit 202 includes a first resistor 203 and a first amplifier 204; the first resistor 203 is connected between the power supply circuit 400 and the battery 500, the first input terminal of the first amplifier 204 is connected to the first end of the first resistor 203, the second input terminal of the first amplifier 204 is connected to the second end of the first resistor 203, and the output terminal of the first amplifier 204 is connected to the adder 201.

[0048] Exemplarily, the first input terminal and the second input terminal of the first amplifier 204 may be a positive input terminal and a negative input terminal, respectively. In addition, the first amplifier 204 may also include positive and negative power supply terminals. In the disclosed embodiment, the current sampling circuit 200 may be formed by the first amplifier 204 and the first resistor 203 to collect the current between the power supply circuit 400 and the battery 500, and convert the current into a voltage value, i.e., V1, V2, V3...Vn in the above embodiment. When the current value in each charging path changes, the voltage collected by the sampling subcircuit 202 changes accordingly, and the operation result of the adder 201 also changes accordingly.

[0049] Figure 5 A schematic diagram of another charging control circuit structure provided for an embodiment of the present disclosure; in some embodiments, the adder 201 includes a second amplifier 205, a second resistor 206 and a third resistor 207; the first input terminal of the second amplifier 205 is connected to the multiple sampling sub-circuits 202, and the output terminal of the second amplifier 205 is connected to the voltage driving circuit 300; the first end of the second resistor 206 is connected to the second input terminal of the second amplifier 205, and the second end of the second resistor 206 is grounded; the first end of the third resistor 207 is connected to the second input terminal of the second amplifier 205, and the second end of the third resistor 207 is connected to the output terminal of the second amplifier 205.

[0050] Exemplarily, the second amplifier 205 in the embodiment of the present disclosure may be a common-phase amplifier, the first input terminal to which the first end of the second resistor 206 and the first end of the third resistor 207 can be connected may be a negative input terminal, the second input terminal of the second amplifier 205 may be a positive input terminal, and in addition, the second amplifier 205 may also include positive and negative power supply terminals, and each sampling subcircuit may also include a fourth resistor 208. Thus, the sum of the voltage values ​​corresponding to the currents of all charging paths can be determined by the action of the adder 201, that is, the addition result is obtained, and the switch circuit 100 can control the charging path between the power supply circuit 400 and the battery 500 to be turned off based on the addition result, that is, the switch circuit 100 is actually controlled by the adder 201. However, in the embodiment of the present disclosure, the on-off of the charging path is not controlled by software, but only by hardware, so the time for software running can be avoided, and the on-off of the charging path can be controlled with faster efficiency.

[0051] Figure 6 Another schematic diagram of a charging control circuit structure provided for an embodiment of the present disclosure; in some embodiments, the voltage driving circuit 300 includes a charge pump subcircuit 301, and the charge pump subcircuit 301 is used to amplify the voltage value corresponding to the current in the charging path to generate a driving voltage.

[0052] Exemplarily, the switch element 102 may be a MOS tube, which can control the on-off between the source and the drain based on the voltage input by the gate. For the MOS tube, the corresponding off voltage is generally large, and the addition result output by the adder 201 may not be able to control the MOS tube to turn off even when the current (or voltage) in the charging path is abnormal. In the embodiment of the present disclosure, the driving voltage output by the adder 201 can be boosted by the charge pump subcircuit 301. For example, if the driving voltage output by the adder 201 is V1+V2+V3+…+Vn, it can be boosted to 10×(V1+V2+V3+…+Vn) by the charge pump subcircuit 301. It should be noted that this numerical value is only for illustrative purposes, and the purpose is only to explain the embodiment of the present disclosure, and it is not necessarily completely consistent with the actual scene. For example, in the actual scene, it is not necessarily possible or necessary to increase the driving voltage by 10 times. After boosting by the charge pump subcircuit 301, the MOS tube can be controlled to turn off in time when the current (or voltage) in the charging path is abnormal.

[0053] Figure 7 A schematic diagram of another charging control circuit structure provided for an embodiment of the present disclosure; in some embodiments, the voltage driving circuit 300 further includes a voltage dividing subcircuit 302, and the voltage dividing subcircuit 302 is used to divide the driving voltage output by the charge pump subcircuit 301.

[0054] For example, in some scenarios, the voltage that the charge pump subcircuit 301 can withstand is relatively small, while the voltage of the addition result output by the adder 201 is relatively large, which may cause damage to the charge pump subcircuit 301. In the disclosed embodiment, the voltage divider subcircuit 302 can divide the addition result output by the adder 201 to obtain a divided driving voltage, and the divided driving voltage is less than the maximum voltage that the charge pump subcircuit 301 can withstand, so as to ensure that the charge pump subcircuit 301 will not be damaged, and the charge pump subcircuit 301 can amplify the received driving voltage to drive the MOS tube to turn off when the current (or voltage) in the charging path is abnormal.

[0055] Continue reading Figure 6 or Figure 7 In some embodiments, the voltage driving circuit 300 includes a charge pump subcircuit 301 , and the charge pump subcircuit 301 is electrically connected to the switch elements 102 in all the switch subcircuits 101 .

[0056] For example, a charge pump subcircuit 301 can output a driving voltage to all switch elements 102, that is, to the MOS tube, so as to control the MOS tube to be turned off when the current (or voltage) in the charging path is abnormal. When all MOS tubes are turned off, the power supply circuit 400 can no longer provide current (or voltage) to the battery 500, which can prevent the battery 500 from being damaged. At the same time, the power supply circuit 400 and the charging path can also be prevented from being damaged.

[0057] Figure 8 A schematic diagram of another charging control circuit structure provided for an embodiment of the present disclosure; in some embodiments, the voltage driving circuit 300 includes a first charge pump subcircuit 301 and a second charge pump subcircuit 301, and the first charge pump subcircuit 301 and the second charge pump subcircuit 301 are both electrically connected to the sampling circuit 200; each switch subcircuit 101 includes a first switch element 102 and a second switch element 102, and the first switch element 102 and the second switch element 102 are connected in series, each first switch element 102 is electrically connected to the first voltage driving circuit 300, and each second switch element 102 is electrically connected to the second voltage driving circuit 300.

[0058] For example, in order to further improve safety and prevent the charging path from being unable to be turned off due to damage to a charge pump subcircuit 301 or a switch element 102, two switch elements 102 connected in series may be provided in each charging path in the embodiment of the present disclosure, namely, a first switch element 102 and a second switch element 102. The first switch element 102 in each charging path may be controlled by the first charge pump subcircuit 301, and the second switch element 102 in each charging path may be controlled by the second charge pump subcircuit 301. When the current (or voltage) in the charging path is abnormal, the first switch element 102 and the second switch element 102 in each charging path may be controlled to be turned off simultaneously by the first charge pump subcircuit 301 and the second charge pump subcircuit 301. In this way, even if one of the first charge pump subcircuit 301 and the second charge pump subcircuit 301 is damaged, the charging path may still be controlled to be turned off by the other charge pump subcircuit 301, thereby protecting the battery 500 and improving safety.

[0059] An embodiment of the present disclosure also provides a vehicle, the vehicle comprising a charging control circuit as described in any one of the above charging control circuit embodiments.

[0060] The charging control circuit provided in the embodiments of the present disclosure includes the charging control circuit of any one of the above-mentioned charging control circuit embodiments, and therefore can also solve the same technical problems as the above-mentioned charging control circuit embodiments and achieve the same technical effects, which will not be repeated here.

[0061] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0062] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A charging control circuit, characterized in that: include: A switch circuit, wherein the switch circuit is connected between the power supply circuit and the battery; a sampling circuit, the sampling circuit being electrically connected to the switch circuit and configured to collect a voltage value corresponding to a current in a charging path between the power supply circuit and the battery; A voltage driving circuit, the voltage driving circuit is electrically connected to the sampling circuit, the voltage driving circuit generates a driving voltage based on a voltage value corresponding to the current in the charging path; the voltage driving circuit is also electrically connected to the switching circuit, the switching circuit is used to turn on or off the charging path based on the driving voltage, the charging path is a path between the power supply circuit and the battery.

2. The charging control circuit according to claim 1, characterized in that: The switch circuit includes a plurality of switch sub-circuits connected in parallel; each of the switch sub-circuit includes at least one switch element.

3. The charging control circuit according to claim 2, characterized in that: The sampling circuit includes an adder and a plurality of sampling subcircuits; the plurality of sampling subcircuits correspond one-to-one to the plurality of switch subcircuits; the sampling subcircuits are used to collect voltage values ​​corresponding to currents of the corresponding switch subcircuits; The adder is electrically connected to the plurality of sampling sub-circuits, and is used for performing addition operation on the voltage values ​​collected by the plurality of sampling sub-circuits, and sending the addition operation result to the voltage driving circuit.

4. The charging control circuit according to claim 3, characterized in that: The sampling subcircuit includes a first resistor and a first amplifier; The first resistor is connected between the power supply circuit and the battery, the first input end of the first amplifier is connected to the first end of the first resistor, the second input end of the first amplifier is connected to the second end of the first resistor, and the output end of the first amplifier is connected to the adder.

5. The charging control circuit according to claim 3, characterized in that: The adder includes a second amplifier, a second resistor and a third resistor; The first input end of the second amplifier is connected to the plurality of sampling sub-circuits, and the output end of the second amplifier is connected to the voltage driving circuit; A first end of the second resistor is connected to a second input end of the second amplifier, and a second end of the second resistor is grounded; A first end of the third resistor is connected to a second input end of the second amplifier, and a second end of the third resistor is connected to an output end of the second amplifier.

6. The charging control circuit according to claim 2, characterized in that: The voltage driving circuit includes a charge pump subcircuit, and the charge pump subcircuit is used to amplify the voltage value corresponding to the current of the charging path to generate the driving voltage.

7. The charging control circuit according to claim 6, characterized in that: The voltage driving circuit further includes a voltage dividing subcircuit, and the voltage dividing subcircuit is used to divide the driving voltage output by the charge pump subcircuit.

8. The charging control circuit according to claim 6, characterized in that: The voltage driving circuit includes a charge pump subcircuit, and the charge pump subcircuit is electrically connected to the switch elements in all the switch subcircuits.

9. The charging control circuit according to claim 6, characterized in that: The voltage driving circuit comprises a first charge pump subcircuit and a second charge pump subcircuit, wherein the first charge pump subcircuit and the second charge pump subcircuit are both electrically connected to the sampling circuit; Each of the switch sub-circuits includes a first switch element and a second switch element, and the first switch element and the second switch element are connected in series, each of the first switch elements is electrically connected to the first voltage driving circuit, and each of the second switch elements is electrically connected to the second voltage driving circuit.

10. A vehicle, characterized in that: The vehicle comprises a charging control circuit as claimed in any one of claims 1 to 9.

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