Control circuit, method and control equipment for sampling voltage

Abstract

The invention relates to the technical field of voltage sampling, and discloses a control circuit, method and control equipment for sampling voltage, the circuit comprises a sampling control circuit and a main circuit, the first end of the sampling control circuit is electrically connected with the first end of the main circuit, and the second end of the sampling control circuit is used for accessing a driving signal; the third end is used for being electrically connected with a battery management system, the second end of the main circuit is used for accessing a pre-charging switch signal, the fourth end of the sampling control circuit and the third end of the main circuit are both used for being grounded, and the pre-charging switch signal is received through the main circuit; the working mode of the main circuit is controlled according to the pre-charging switch signal; and executing a preset control operation on the sampling control circuit according to the working mode of the main circuit. It can be seen that before voltage sampling, the sampling control circuit can be pre-charged through the main circuit so as to improve the sampling current output by the sampling control circuit in the subsequent voltage sampling process, and therefore the voltage sampling speed can be improved, and the sampling time can be shortened.

Description

Technical Field

[0001] The present application relates to the technical field of voltage sampling, and in particular to a control circuit, method and control device for sampling voltage. Background Art

[0002] In the current high-voltage BMS system (Battery Management System), there is usually a need to sample the total voltage of the battery pack, and the traditional total voltage sampling method is mainly: adding a high-voltage MOSFET as a switch in the high-voltage sampling loop. When the high-voltage MOSFET is closed, the high-voltage source charges the ADC sampling capacitor through the sampling resistor. The voltage across the charged sampling capacitor is the voltage required for sampling.

[0003] However, it is found in practice that in the process of charging the ADC sampling capacitor through the sampling resistor, the sampling resistor is often relatively large, which easily leads to a small sampling current, resulting in a slow sampling speed and a long time. It can be seen that it is particularly important to propose a technical solution to improve the voltage sampling speed of the battery pack. Summary of the invention

[0004] The present application provides a control circuit, method and control device for sampling voltage, which can pre-charge the sampling control circuit through the main circuit before voltage sampling to increase the sampling current in the subsequent voltage sampling process, which is beneficial to improve the voltage sampling speed and reduce the sampling time.

[0005] In order to solve the above technical problems, the first aspect of the present application discloses a control circuit for sampling a voltage, wherein the control circuit includes a sampling control circuit 101 and a main circuit 102, wherein:

[0006] The first end of the sampling control circuit 101 is electrically connected to the first end of the main circuit 102, the second end of the sampling control circuit 101 is used to access the driving signal, the third end of the sampling control circuit 101 is used to electrically connect to the battery management system, the second end of the main circuit 102 is used to access the pre-charge switch signal, and the fourth end of the sampling control circuit 101 and the third end of the main circuit 102 are both used for grounding;

[0007] The main circuit 102 is used to control the main circuit (102) to perform a preset control operation on the sampling control circuit (101) according to the pre-charge switch signal, wherein the preset control operation includes a charging operation and / or a voltage sampling operation.

[0008] As an optional implementation, in the first aspect of the present application, the main circuit 102 includes a pre-charging circuit 1021 and a control chip 1022, wherein:

[0009] The first end of the pre-charging circuit 1021 is electrically connected to the first end of the control chip 1022, the second end of the pre-charging circuit 1021 is electrically connected to the first end of the sampling control circuit 101 and the second end of the control chip 1022, the third end of the pre-charging circuit 1021 is used to access the pre-charging switch signal, and the fourth end of the pre-charging circuit 1021 is used for grounding;

[0010] The control chip 1022 is used to charge the pre-charging circuit 1021 according to the charging voltage output by the control chip 1022 to obtain a pre-charging voltage;

[0011] The pre-charging circuit 1021 is used to control the sampling control circuit 101 to output a first sampling voltage to the control chip 1022 according to the pre-charging switch signal and the driving signal.

[0012] As an optional implementation, in the first aspect of the present application, the pre-charging circuit 1021 includes a pre-charging switch device Q1, a pre-charging capacitor C1 and a pre-charging resistor R1, wherein:

[0013] The first pole of the pre-charge switch device Q1 is electrically connected to the first end of the sampling control circuit 101 and the second end of the control chip 1022, the second pole of the pre-charge switch device Q1 is used to access the pre-charge switch signal, the third pole of the pre-charge switch device Q1 is electrically connected to one end of the pre-charge capacitor C1 and one end of the pre-charge resistor R1, the other end of the pre-charge resistor R1 is electrically connected to the first end of the control chip 1022, and the other end of the pre-charge capacitor C1 is used for grounding.

[0014] As an optional implementation, in the first aspect of the present application, the main circuit 102 further includes a current limiting module 1023, wherein:

[0015] The first end of the current limiting module 1023 is electrically connected to the other end of the pre-charging resistor R1, and the second end of the current limiting module 1023 is electrically connected to the first end of the control chip 1022;

[0016] The current limiting module 1023 is used to control the current direction of each component of the main circuit 102 to flow from the control chip 1022 to the pre-charging resistor R1.

[0017] As an optional implementation, in the first aspect of the present application, the sampling control circuit 101 includes a voltage sampling circuit 1011 and a filter charging circuit 1012, wherein:

[0018] The first end of the voltage sampling circuit 1011 is electrically connected to the first end of the filter charging circuit 1012, the second end of the voltage sampling circuit 1011 is used to access the drive signal, the third end of the voltage sampling circuit 1011 is used to electrically connect to the battery management system, the second end of the filter charging circuit 1012 is electrically connected to the second end of the pre-charging circuit 1021 in the main circuit 102 and the second end of the control chip 1022 in the main circuit 102, and the fourth end of the voltage sampling circuit 1011 and the third end of the filter charging circuit 1012 are both used for grounding;

[0019] The filter charging circuit 1012 is used to charge the filter charging circuit 1012 according to the pre-charge voltage output by the pre-charge circuit 1021, obtain the auxiliary sampling voltage, and provide the auxiliary sampling voltage to the voltage sampling circuit 1011;

[0020] The voltage sampling circuit 1011 is used to output a first sampling voltage according to the pre-charging switch signal and the driving signal under the power supply of the filter charging circuit 1012;

[0021] The filter charging circuit 1012 is also used to filter the pre-charge switch signal and the drive signal.

[0022] As an optional implementation, in the first aspect of the present application, the voltage sampling circuit 1011 includes a voltage dividing module 10111 and a driving module 10112, wherein:

[0023] The first end of the driving module 10112 is electrically connected to the first end of the filter charging circuit 1012, the second end of the driving module 10112 is used to access the driving signal, the third end of the driving module 10112 is electrically connected to the first end of the voltage dividing module 10111, the second end of the voltage dividing module 10111 is electrically connected to the battery management system, and the fourth end of the driving module 10112 is used for grounding;

[0024] The driving module 10112 is used to control the voltage dividing module 10111 to step down the voltage output by the battery management system to obtain a first sampling voltage when the received pre-charging switch signal is the switch disconnection signal and the voltage sampling circuit 1011 is connected to the driving signal.

[0025] As an optional implementation, in the first aspect of the present application, the driving module 10112 includes a driving switch device Q2 and a protection resistor R2, wherein:

[0026] The first pole of the driving switch device Q2 is electrically connected to one end of the protection resistor R2 and the first end of the filter charging circuit 1012, the second pole of the driving switch device Q2 is used to access the driving signal, the third pole of the driving switch device Q2 is electrically connected to the first end of the voltage divider module 10111, and the other end of the protection resistor R2 is used for grounding.

[0027] As an optional implementation, in the first aspect of the present application, the driving switch device Q2 includes a MOS tube or a triode, wherein:

[0028] When the driving switch device Q2 is a MOS tube, the first electrode of the driving switch device Q2 is a source electrode, the second electrode of the driving switch device Q2 is a gate electrode, and the third electrode of the driving switch device Q2 is a drain electrode;

[0029] When the driving switch device Q2 is a triode, the first electrode of the driving switch device Q2 is an emitter, the second electrode of the driving switch device Q2 is a base, and the third electrode of the driving switch device Q2 is a collector.

[0030] The second aspect of the present application discloses a control method for sampling voltage, the method is applied to a control circuit for sampling voltage, wherein the control circuit comprises a sampling control circuit and a main circuit, wherein a first end of the sampling control circuit is electrically connected to a first end of the main circuit, a second end of the sampling control circuit is used to access a driving signal, a third end of the sampling control circuit is used to electrically connect to a battery management system, a second end of the main circuit is used to access a pre-charge switch signal, and a fourth end of the sampling control circuit and a third end of the main circuit are both used to be grounded; the method comprises:

[0031] The main circuit receives the pre-charge switch signal; and controls the working mode of the main circuit according to the pre-charge switch signal, wherein the working mode of the main circuit includes a charging mode or a sampling mode;

[0032] The main circuit performs a preset control operation on the sampling control circuit according to the working mode of the main circuit, the preset control operation includes a charging operation or a voltage sampling operation, and the execution priority of the charging operation is higher than the execution priority of the voltage sampling operation;

[0033] Among them, when the pre-charge switch signal is a switch closing signal, the working mode of the main circuit is the charging mode, and the preset control operation is the charging operation; when the pre-charge switch signal is a switch opening signal, the working mode of the main circuit is the sampling mode, and the preset control operation is the voltage sampling operation.

[0034] A third aspect of the present application discloses a control device, the control device comprising a device body, and the control device further comprising a control circuit for sampling voltage as described in any one of the first aspects of the present application.

[0035] The implementation of this application has the following beneficial effects:

[0036] In the present application, a control circuit for sampling voltage is provided, the circuit comprising a sampling control circuit 101 and a main circuit 102, wherein a first end of the sampling control circuit 101 is electrically connected to a first end of the main circuit 102, a second end of the sampling control circuit 101 is used to access a drive signal, a third end of the sampling control circuit 101 is used to electrically connect to a battery management system, a second end of the main circuit 102 is used to access a pre-charge switch signal, a fourth end of the sampling control circuit 101 and a third end of the main circuit 102 are both used to be grounded; the main circuit 102 is used to receive the pre-charge switch signal; and according to the pre-charge switch signal, control the operation of the main circuit 102. working mode; and according to the working mode of the main circuit 102, performing a preset control operation on the sampling control circuit 101, the working mode of the main circuit 102 includes a charging mode or a sampling mode, the preset control operation includes a charging operation or a voltage sampling operation, and the execution priority of the charging operation is higher than the execution priority of the voltage sampling operation; wherein, when the pre-charge switch signal is a switch closing signal, the working mode of the main circuit 102 is the charging mode, and the preset control operation is the charging operation; when the pre-charge switch signal is a switch opening signal, the working mode of the main circuit 102 is the sampling mode, and the preset control operation is the voltage sampling operation. It can be seen that in the implementation of the present application, the main circuit 102 receives the pre-charge switch signal; and when the pre-charge switch signal is a switch closing signal, the main circuit 102 is controlled to enter the charging mode, and the main circuit 102 performs a charging operation on the sampling control circuit 101, so that the sampling control circuit 101 can be pre-charged quickly and accurately when the main circuit 102 is connected to the switch closing signal. Then, when the pre-charge switch signal is converted into a switch disconnection signal and the sampling control circuit is connected to the driving signal, the main circuit 102 is controlled to enter the sampling mode, and the main circuit 102 controls the sampling control circuit 101 to perform a voltage sampling operation on the battery management system. When the switch is disconnected, the sampling current output by the sampling control circuit 101 during the sampling process can be increased according to the charged voltage obtained by the sampling control circuit 101 in the charging mode under the driving of the driving signal, thereby facilitating the improvement of the voltage sampling speed and the voltage sampling efficiency based on the improved sampling current, and facilitating the reduction of the time required for voltage sampling, and by setting a plurality of working modes of the main circuit 102, it is conducive to realizing the diverse functions of the sampling control circuit 101, such as the charging function and the sampling function, thereby facilitating the improvement of the applicability of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 is a structural schematic diagram of a control circuit for sampling voltage disclosed in an embodiment of the present application;

[0039] Figure 2 is a schematic diagram of the structure of another control circuit for sampling voltage disclosed in an embodiment of the present application;

[0040] Figure 3 is a curve diagram showing the relationship between sampling voltage and sampling time under precharging control without precharging circuit disclosed in an embodiment of the present application;

[0041] Figure 4 is a curve diagram showing the relationship between a sampling voltage and a sampling time under pre-charging control of a pre-charging circuit disclosed in an embodiment of the present application;

[0042] Figure 5 It is a structural schematic diagram of another control circuit for sampling voltage disclosed in an embodiment of the present application;

[0043] Figure 6 It is a flow chart of a control method for sampling voltage disclosed in an embodiment of the present application;

[0044] Figure 7 It is a structural schematic diagram of a control device disclosed in an embodiment of the present application. DETAILED DESCRIPTION

[0045] For better understanding and implementation, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] It should be noted that, unless otherwise clearly specified and limited, the term "electrical connection" in the specification and claims of this application and the above-mentioned drawings should be understood in a broad sense. For example, it can be a fixed electrical connection, a detachable electrical connection, or an integral electrical connection; it can be a mechanical electrical connection, an electrical electrical connection, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. In addition, the terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. The terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] Embodiment 1

[0048] See also Figure 1 , Figure 1 is a flow chart of a control method for sampling voltage disclosed in an embodiment of the present application. Figure 1 The control method for sampling voltage described above can be applied to any electronic product that needs to sample voltage, and the present application embodiment does not limit this. Figure 1 As shown, the control circuit for sampling voltage includes a sampling control circuit 101 and a main circuit 102, wherein:

[0049] The first end of the sampling control circuit 101 is electrically connected to the first end of the main circuit 102, the second end of the sampling control circuit 101 is used to access the driving signal, the third end of the sampling control circuit 101 is used to electrically connect to the battery management system, the second end of the main circuit 102 is used to access the pre-charge switch signal, and the fourth end of the sampling control circuit 101 and the third end of the main circuit 102 are both used for grounding;

[0050] The main circuit 102 is used to control the main circuit 102 to perform a preset control operation on the sampling control circuit 101 according to the pre-charge switch signal, and the preset control operation includes a charging operation and / or a voltage sampling operation.

[0051] In this optional embodiment, the main circuit 102 controls the main circuit 102 to perform a preset control operation on the sampling control circuit 101 according to the pre-charge switch signal, specifically including:

[0052] The main circuit 102 receives a pre-charge switch signal; and controls the working mode of the main circuit 102 according to the pre-charge switch signal; and according to the working mode of the main circuit 102, performs a preset control operation on the sampling control circuit 101, wherein the working mode of the main circuit 102 includes a charging mode or a sampling mode, and the preset control operation includes a charging operation or a voltage sampling operation.

[0053] In an embodiment of the present application, the execution priority of the charging operation is higher than the execution priority of the voltage sampling operation. When the pre-charge switch signal is a switch closing signal, the working mode of the main circuit 102 is the charging mode, and the preset control operation is the charging operation; when the pre-charge switch signal is a switch disconnection signal, the working mode of the main circuit 102 is the sampling mode, and the preset control operation is the voltage sampling operation. Specifically, before performing the voltage sampling operation, the switch closing signal is connected to make the main circuit 102 enter the charging mode, and the charging operation is performed on the sampling control circuit 101. When the charging operation is completed, the pre-charge switch signal is changed from the switch closing signal to the switch closing signal, so that the main circuit 102 enters the sampling mode. At this time, if the sampling control circuit 101 is connected to the driving signal, the main circuit 102 is prompted to control the sampling control circuit 101 according to the charged voltage obtained by the sampling control circuit in the charging mode to perform a voltage sampling operation on the battery management system.

[0054] It can be seen that implementation Figure 1 The control circuit for sampling voltage described above receives a pre-charge switch signal through the main circuit 102; and when the pre-charge switch signal is a switch closing signal, controls the main circuit 102 to enter a charging mode, and performs a charging operation on the sampling control circuit 101 through the main circuit 102, so that the sampling control circuit 101 can be pre-charged quickly and accurately when the main circuit 102 is connected to the switch closing signal. Subsequently, when the pre-charge switch signal is transformed into a switch disconnection signal and the sampling control circuit is connected to the driving signal, controls the main circuit 102 to enter a sampling mode, and controls the sampling control circuit 101 through the main circuit 102 to perform a voltage sampling operation on the battery management system, so that when the switch is disconnected, the sampling current output by the sampling control circuit 101 during the sampling process can be increased according to the charged voltage obtained by the sampling control circuit 101 in the charging mode under the driving of the driving signal, thereby facilitating the improvement of the voltage sampling speed and voltage sampling efficiency based on the improved sampling current, and facilitating the reduction of the time required for voltage sampling, and facilitating the realization of the diverse functions of the sampling control circuit 101, such as the charging function and the sampling function, by setting a plurality of working modes of the main circuit 102, thereby facilitating the improvement of the applicability of the circuit.

[0055] In an optional embodiment, if Figure 2 As shown, Figure 2is a schematic diagram of another control circuit for sampling voltage disclosed in an embodiment of the present application, such as Figure 2 As shown, the control circuit for sampling voltage includes a sampling control circuit 101 and a main circuit 102, and the main circuit 102 includes a pre-charging circuit 1021 and a control chip 1022, wherein:

[0056] A first end of the pre-charging circuit 1021 is electrically connected to a first end of the control chip 1022, a second end of the pre-charging circuit 1021 is electrically connected to a first end of the sampling control circuit 101 and a second end of the control chip 1022, a third end of the pre-charging circuit 1021 is used to access a pre-charging switch signal, and a fourth end of the pre-charging circuit 1021 is used to be grounded;

[0057] The control chip 1022 is used to charge the pre-charging circuit 1021 according to the charging voltage output by the control chip 1022 to obtain a pre-charging voltage;

[0058] The pre-charging circuit 1021 is used to control the sampling control circuit 101 to output a first sampling voltage to the control chip 1022 according to the pre-charging switch signal and the driving signal.

[0059] The method in which the pre-charging circuit 1021 controls the sampling control circuit 101 to output the first sampling voltage to the control chip 1022 according to the pre-charging switch signal and the driving signal specifically includes:

[0060] When the pre-charging switch signal received by the pre-charging circuit 1021 is a switch closing signal, the pre-charging voltage is provided to the sampling control circuit 101, and the charging voltage is provided to the sampling control circuit 101 through the pre-charging circuit 1021, so as to trigger the sampling control circuit 101 to flow the first sampling voltage corresponding to the battery management system to the control chip 1022 according to the received driving signal.

[0061] In this optional embodiment, the control chip 1022 is also used to amplify the first sampling voltage according to a preset voltage amplification factor to obtain a second sampling voltage, and update the charging voltage according to the second sampling voltage, and repeatedly perform the above-mentioned operation of charging the pre-charging circuit 1021 according to the charging voltage output by the control chip 1022 to obtain the pre-charging voltage.

[0062] Optionally, the charging voltage output by the control chip 1022 may be the second sampling voltage of the sampling control circuit 101 collected by the control chip 1022, or the voltage difference between the charging voltage and the second sampling voltage may be less than or equal to a preset voltage difference, which is not limited in the embodiment of the present application.

[0063] For example, Figure 3 As shown, Figure 31 is a curve diagram showing the relationship between the sampling voltage and the sampling time under the pre-charging control without the pre-charging circuit disclosed in the embodiment of the present application, wherein, when the pre-charging circuit is not provided or the voltage is not pre-charged in the pre-charging circuit, the time required for the control chip 1022 to collect a stable voltage is 14 milliseconds; for example, Figure 4 As shown, Figure 4 It is a curve diagram of the relationship between the sampling voltage and the sampling time under the pre-charging control of a pre-charging circuit disclosed in an embodiment of the present application, wherein, when the pre-charging circuit charges the voltage in advance, the time required for the control chip 1022 to collect a stable voltage is only 1.5 milliseconds, that is, the sampling time required for the sampling scheme provided in the embodiment of the present application is reduced by 89% compared with the sampling time required for the traditional sampling scheme under the pre-charging control without a pre-charging circuit in the prior art.

[0064] It can be seen that this optional embodiment can charge the pre-charging circuit 1021 according to the charging voltage output by the control chip 1022 through the control chip 1022 to obtain the pre-charging voltage; and when the received pre-charging switch signal is a switch closing signal, the pre-charging voltage is provided to the sampling control circuit 101 through the pre-charging circuit 1021, and the charging voltage is provided to the sampling control circuit 101 through the pre-charging circuit 1021, so as to trigger the sampling control circuit 101 to flow the first sampling voltage corresponding to the battery management system to the control chip 1022 according to the received driving signal; then, the control chip 1022 amplifies the first sampling voltage according to a preset voltage amplification factor to obtain a second sampling voltage, and updates the charging voltage according to the second sampling voltage, and repeatedly performs the operation of charging the pre-charging circuit 1021 according to the charging voltage output by the control chip 1022 to obtain the pre-charging voltage, which can be achieved through A main circuit 102 is set, and the pre-charge voltage provided by the pre-charge circuit 1021 in the main circuit 102 for the sampling control circuit 101 and the charging voltage provided by the control chip 1022 in the main circuit 102 for the sampling control circuit 101 through the pre-charge circuit 1021 are stored in the sampling control circuit 101, and in the subsequent process of the sampling control circuit 101 performing a voltage sampling operation, the sampling current flowing through each component in the sampling control circuit 101 is increased by the stored voltage in the sampling control circuit 101, so as to realize fast and accurate acquisition of the required sampling control circuit 101, which is conducive to greatly reducing the required sampling time. In addition, the charging voltage can be updated in time according to the latest collected sampling voltage through the control chip 1022, which is conducive to improving the accuracy and efficiency of the updated charging voltage. Repeating this process is conducive to improving the control flexibility of the circuit and the applicability of the circuit.

[0065] In this optional embodiment, as an optional implementation, as Figure 5 As shown, Figure 5is a schematic diagram of a control circuit for sampling voltage disclosed in an embodiment of the present application, such as Figure 5 As shown, the pre-charging circuit 1021 includes a pre-charging switching device Q1, a pre-charging capacitor C1 and a pre-charging resistor R1, wherein a first pole of the pre-charging switching device Q1 is electrically connected to a first end of the sampling control circuit 101 and a second end of the control chip 1022, a second pole of the pre-charging switching device Q1 is used to access a pre-charging switching signal, a third pole of the pre-charging switching device Q1 is electrically connected to one end of the pre-charging capacitor C1 and one end of the pre-charging resistor R1, the other end of the pre-charging resistor R1 is electrically connected to the first end of the control chip 1022, and the other end of the pre-charging capacitor C1 is used to be grounded.

[0066] Among them, the pre-charge resistor R1 is used to pass the charging voltage received from the main circuit output to the pre-charge capacitor through the pre-charge resistor R1, so as to charge the voltage of the pre-charge capacitor C1 to the pre-charge voltage; the pre-charge switch device Q1 is used to control the pre-charge capacitor C1 to provide the stored pre-charge voltage to the sampling control circuit 101 when the connected pre-charge switch signal is a switch closing signal.

[0067] Optionally, the pre-charge switch device Q1 may include a MOS tube, a triode, or any other device or component that can play an equivalent switch role, which is not limited in the embodiment of the present application. Figure 5 As shown, when the pre-charging switch device Q1 is a MOS tube, the first pole of the pre-charging switch device Q1 is a drain, the second pole of the pre-charging switch device Q1 is a gate, and the third pole of the pre-charging switch device Q1 is a source; when the pre-charging switch device Q1 is a transistor, the first pole of the pre-charging switch device Q1 is a collector, the second pole of the pre-charging switch device Q1 is a base, and the third pole of the pre-charging switch device Q1 is an emitter.

[0068] It can be seen that this optional implementation can replace the pre-charge switching device Q1 according to the voltage required by the connected electronic components. That is, if the voltage required by the electronic components is higher, the pre-charge switching device Q1 can be directly replaced with a more voltage-resistant switching device. This can meet the needs of electronic components with different voltages, and the circuit of this solution is more adaptable.

[0069] In this optional embodiment, optionally, as Figure 5 As shown, the main circuit 102 also includes a current limiting module 1023, wherein a first end of the current limiting module 1023 is electrically connected to the other end of the pre-charging resistor R1, and a second end of the current limiting module 1023 is electrically connected to a first end of the control chip 1022; the current limiting module 1023 is used to control the current direction of each component of the main circuit 102 to flow from the control chip 1022 to the pre-charging resistor R1.

[0070] Optionally, the current limiting module 1023 may include a diode, a current limiting resistor, or any other device or component that can play an equivalent current limiting role, which is not limited in the embodiment of the present application.

[0071] like Figure 5 As shown, when the current limiting module 1023 includes a diode D1, the positive electrode of the diode is electrically connected to the first end of the control chip 1022, and the negative electrode of the diode is electrically connected to the other end of the pre-charging resistor R1. In this way, the current direction of each component of the main circuit 102 is limited by the unidirectional conductivity of the diode D1, and the current direction is limited to the direction from the control chip 1022 to the pre-charging resistor R1.

[0072] It can be seen that this optional implementation can also realize accurate charging of the pre-charge capacitor under the limiting effect of the current direction of the current limiting module 1023 by setting a current limiting module 1023, thereby avoiding the situation where the pre-charge voltage is mistakenly provided to the control chip during the subsequent pre-charge capacitor powering the sampling control circuit, which helps to implement the sampling process corresponding to the circuit of this scheme.

[0073] In another optional embodiment, Figure 5 As shown, the sampling control circuit 101 includes a voltage sampling circuit 1011 and a filter charging circuit 1012, wherein:

[0074] The first end of the voltage sampling circuit 1011 is electrically connected to the first end of the filter charging circuit 1012, the second end of the voltage sampling circuit 1011 is used to access the drive signal, the third end of the voltage sampling circuit 1011 is used to electrically connect to the battery management system, the second end of the filter charging circuit 1012 is electrically connected to the second end of the pre-charging circuit 1021 in the main circuit 102 and the second end of the control chip 1022 in the main circuit 102, and the fourth end of the voltage sampling circuit 1011 and the third end of the filter charging circuit 1012 are both used for grounding;

[0075] The filter charging circuit 1012 is used to charge the filter charging circuit 1012 according to the pre-charge voltage output by the pre-charge circuit 1021, obtain the auxiliary sampling voltage, and provide the auxiliary sampling voltage to the voltage sampling circuit 1011;

[0076] The voltage sampling circuit 1011 is used to output a first sampling voltage according to a pre-charging switch signal and a driving signal under the power supply of the filter charging circuit 1012;

[0077] The filter charging circuit 1012 is also used to filter the pre-charge switch signal and the drive signal.

[0078] In this optional embodiment, the voltage sampling circuit 1011 outputs the first sampling voltage according to the pre-charge switch signal and the drive signal under the power supply of the filter charging circuit 1012, specifically including:

[0079] When the received pre-charge switch signal is a switch-off signal and the voltage sampling circuit 1011 is connected to the driving signal, the voltage sampling circuit 1011 outputs a first sampling voltage for the control chip 1022 according to the voltage output by the battery management system.

[0080] In this optional embodiment, the filtering charging circuit 1012 performs filtering processing on the pre-charge switch signal and the drive signal in the following manner:

[0081] When the pre-charge switch signal changes between the switch closing signal and the switch opening signal, the filter charging circuit 1012 filters the pre-charge switch signal; and / or, when the drive signal is received, filters the drive signal.

[0082] It can be seen that this optional embodiment can charge the filter charging circuit 1012 according to the pre-charge voltage received from the pre-charge circuit 1021, obtain the auxiliary sampling voltage, and provide the auxiliary sampling voltage to the voltage sampling circuit 1011; then, when the received pre-charge switch signal is a switch disconnection signal and the voltage sampling circuit 1011 is connected to the drive signal, the voltage sampling circuit 1011 outputs the first sampling voltage for the control chip 1022 according to the voltage output by the battery management system; and when the pre-charge switch signal changes between the switch closing signal and the switch disconnection signal through the filter charging circuit 1012, the pre-charge switch signal is filtered; when the drive signal is received, the drive signal is filtered, and the auxiliary sampling voltage can be provided to the voltage sampling circuit through the filter charging circuit, thereby increasing the sampling current flowing through each component in the voltage sampling circuit, and then improving the speed and efficiency of the voltage sampling circuit providing the first sampling voltage to the control chip through the filter charging circuit, which is conducive to reducing the time required for sampling, and can also filter the signal connected to the circuit through the filter charging circuit to reduce the interference of clutter during the sampling process.

[0083] In this optional embodiment, as an optional implementation, as Figure 5 As shown, the voltage sampling circuit 1011 includes a voltage dividing module 10111 and a driving module 10112, wherein:

[0084] The first end of the driving module 10112 is electrically connected to the first end of the filter charging circuit 1012, the second end of the driving module 10112 is used to access the driving signal, the third end of the driving module 10112 is electrically connected to the first end of the voltage divider module 10111, the second end of the voltage divider module 10111 is electrically connected to the battery management system, and the fourth end of the driving module 10112 is used for grounding;

[0085] The driving module 10112 is used to control the voltage divider module 10111 to step down the voltage output by the battery management system to obtain a first sampling voltage when the received pre-charge switch signal is a switch disconnection signal and the voltage sampling circuit 1011 is connected to the driving signal. The voltage divider module 10111 is used to step down the voltage output by the battery management system to a sampling voltage range required to be collected by the control chip 1022, that is, the first sampling voltage obtained by stepping down is within the sampling voltage range.

[0086] It can be seen that this optional implementation can control the voltage divider module 10111 to step down the voltage output by the battery management system to obtain a first sampling voltage through the driving module 10112 when the received pre-charge switch signal is a switch disconnect signal and the voltage sampling circuit 1011 is connected to the driving signal. The voltage divider module 10111 can be set to reduce the voltage output by the battery management system, which can improve the voltage sampling speed and voltage sampling efficiency of the control chip 1022 to a certain extent, and can also reduce the occurrence of the control chip being burned out by high voltage by reducing the voltage in the circuit, thereby helping to reduce the cost required for voltage sampling.

[0087] In this optional embodiment, optionally, as Figure 5 As shown, the driving module 10112 includes a driving switch device Q2 and a protection resistor R2, wherein the first pole of the driving switch device Q2 is electrically connected to one end of the protection resistor R2 and the first end of the filter charging circuit 1012, the second pole of the driving switch device Q2 is used to access the driving signal, the third pole of the driving switch device Q2 is electrically connected to the first end of the voltage divider module 10111, and the other end of the protection resistor R2 is used for grounding. The voltage across the protection resistor R2 is the first sampling voltage to be collected. Optionally, the driving switch device Q2 includes a MOS tube or a triode or any other device or component that can play an equivalent switching role, which is not limited in the embodiment of the present application. Figure 5 As shown, when the driving switch device Q2 is a MOS tube, the first pole of the driving switch device Q2 is the source, the second pole of the driving switch device Q2 is the gate, and the third pole of the driving switch device Q2 is the drain; when the driving switch device Q2 is a triode, the first pole of the driving switch device Q2 is the emitter, the second pole of the driving switch device Q2 is the base, and the third pole of the driving switch device Q2 is the collector.

[0088] It can be seen that this optional implementation can also replace the driving switch device Q2 according to the voltage required by the connected electronic components. That is, if the voltage required by the electronic components is higher, the driving switch device Q2 can be directly replaced with a more voltage-resistant switch device. This can meet the needs of electronic components with different voltages, and the circuit of this solution is more adaptable.

[0089] In the embodiment of the present application, optionally, the voltage divider module 10111 may include at least one voltage divider resistor arranged in sequence from the battery management system to the driving switch device Q2. When the number of voltage divider resistors is 1, one end of the voltage divider resistor is used to electrically connect to the battery management system, and the other end of the voltage divider resistor is electrically connected to the third pole of the driving switch device Q2. When the number of voltage divider resistors is greater than 1, each voltage divider resistor is connected in series. Figure 5 For example, a voltage divider composed of four resistors (such as Figure 5 In this way, by providing a variety of voltage-dividing resistors, the voltage output by the battery management system can be accurately stepped down to the sampling voltage range required by the control chip, which is conducive to improving the accuracy and reliability of the first sampling voltage obtained by stepping down the voltage.

[0090] In the embodiment of the present application, optionally, Figure 5 As shown, the filter charging circuit 1012 may include a filter resistor R3, a first filter capacitor C2 and a second filter capacitor C3, wherein one end of the filter resistor R3 is electrically connected to one end of the first filter capacitor C2, the first pole of the driving switch device Q2 and one end of the protection resistor R2, and the other end of the filter resistor R3 is electrically connected to one end of the second filter capacitor C3, the first pole of the pre-charge switch device Q1 and the second end of the control chip (1022), and the other end of the first filter capacitor C2 and the other end of the second filter capacitor C3 are both used for grounding. Among them, the pre-charge voltage output by the pre-charge circuit can be stored in the first filter capacitor C2 and / or the second filter capacitor C3. In addition, when a drive signal is received, the first filter capacitor C2 can filter the drive signal; when the pre-charge switch signal changes between the switch closing signal and the switch opening signal, the second filter capacitor C3 can filter the pre-charge switch signal. In this way, by setting the first filter capacitor C2 and the second filter capacitor C3, the pre-charge voltage provided by the pre-charge circuit is stored in the filter charging circuit 1012 to obtain an auxiliary sampling voltage, and the auxiliary sampling voltage is used to provide a larger sampling current for the subsequent voltage sampling circuit 1011 to perform a voltage sampling operation. In addition, the two filter capacitors can filter out the clutter in the circuit, which is beneficial to reduce the interference of clutter.

[0091] In the embodiment of the present application, optionally, Figure 5As shown, the control chip 1022 includes a microcontroller unit MCU, wherein the microcontroller unit MCU may at least include an analog-to-digital converter ADC and a digital-to-analog converter DAC, wherein the analog-to-digital converter ADC is electrically connected to the first pole of the pre-charging switch device Q1 in the pre-charging circuit 1021, the other end of the filter resistor R3 in the filter charging circuit 1012, and one end of the second filter capacitor C3, and the digital-to-analog converter DAC is electrically connected to the positive pole of the diode D1 in the pre-charging circuit 1021; the analog-to-digital converter ADC is used to convert the collected signal of the first sampling voltage into a first digital signal corresponding to the first sampling voltage, so as to trigger the microcontroller unit MCU to amplify the first sampling voltage corresponding to the first digital signal according to a preset voltage amplification factor to obtain a second digital signal corresponding to the second sampling voltage, and update the third digital signal corresponding to the charging voltage according to the second sampling voltage corresponding to the second digital signal to obtain a fourth digital signal corresponding to the updated charging voltage; the digital-to-analog converter DAC is used to convert the received fourth digital signal into a new charging voltage, and provide the new charging voltage to the pre-charging circuit 1021. Among them, the preset voltage amplification factor can be calculated according to the number of voltage-dividing resistors included in the voltage-dividing module 10111 and the resistance value of each voltage-dividing resistor. In this way, by setting the analog-to-digital converter ADC and the digital-to-analog converter DAC, the microcontroller unit MCU can amplify the first sampling voltage according to the preset amplification factor to obtain the second sampling voltage, and update the charging voltage according to the second sampling voltage, and provide the updated charging voltage to the pre-charging circuit, which is conducive to improving the calculation accuracy and reliability of the sampling voltage, and is conducive to improving the accuracy and reliability of the charging voltage provided to the pre-charging circuit.

[0092] The working principle of the control circuit for sampling voltage in the embodiment of the present application is as follows:

[0093] In the embodiment of the present application, before the analog-to-digital converter ADC in the control chip 102 samples the voltage of the battery pack in the battery management system through the voltage sampling circuit, it first outputs a charging voltage approximately equal to the sampling voltage through the digital-to-analog converter DAC in the control chip 102, and stores the charging voltage in turn through the diode D1 and the pre-charge resistor R1 to the pre-charge capacitor C1, so as to charge the voltage across the pre-charge capacitor to the pre-charge voltage, and then convert the pre-charge switch signal connected to the second pole of the pre-charge switch device Q1 into a switch closing signal (the pre-charge switch signal defaults to a switch opening signal), at which time the pre-charge switch device Q1 is turned on. , and the pre-charge voltage stored in the pre-charge capacitor C1 flows to the second filter capacitor C3, and / or, the pre-charge voltage flows to the first filter capacitor C2 through the filter resistor R3, so as to realize the pre-charge capacitor charging the filter capacitor, and then the pre-charge switch signal is converted into a switch disconnection signal. At this time, in view of the situation that the pre-charge switch signal changes between the switch closing signal and the switch disconnection signal, the pre-charge switch signal can be filtered by the second filter capacitor C3. When sampling is performed, the drive signal is connected to the second pole of the drive switch device Q2. At this time, the drive switch device Q2 is turned on to control the high voltage of the battery pack in the battery management system (such as Figure 5The HV (i.e., High Voltage) shown in the figure is divided by one or more voltage-dividing resistors to flow to the protection resistor R2 through the driving switch device Q2, so that the voltage across the protection resistor R2 falls within the sampling voltage range required to be collected by the analog-to-digital converter ADC in the control chip 102. Subsequently, under the current auxiliary increase of the auxiliary sampling voltage in the filter charging circuit 1012, the voltage across the protection resistor R2 (i.e., the first sampling voltage) flows to the analog-to-digital converter ADC in the control chip 102 to convert the first sampling voltage into a first digital signal. At this time, the control chip 102 converts the first sampling voltage into a first digital signal according to the voltage divided module 10111. The first sampling voltage corresponding to the first digital signal is amplified and calculated to obtain a second digital signal corresponding to the second sampling voltage, and the third digital signal corresponding to the charging voltage is updated according to the second digital signal to obtain a fourth digital signal corresponding to the updated charging voltage. The fourth digital signal is then converted into the updated charging voltage through the digital-to-analog converter DAC in the control chip 102, and the operation of storing the charging voltage in the pre-charge capacitor C1 through the diode D1 and the pre-charge resistor R1 is repeated. It can be seen that in this solution, the main circuit 102 receives the pre-charge switch signal; and when the pre-charge switch signal is a switch closing signal, the main circuit 102 is controlled to enter the charging mode, and the main circuit 102 performs a charging operation on the sampling control circuit 101, so that the sampling control circuit 101 can be pre-charged quickly and accurately when the main circuit 102 is connected to the switch closing signal. Then, when the pre-charge switch signal is converted into a switch disconnection signal and the sampling control circuit is connected to the driving signal, the main circuit 102 is controlled to enter the sampling mode, and the sampling control circuit 101 is controlled by the main circuit 102 to perform a voltage sampling operation on the battery management system. When the switch is disconnected, the sampling current output by the sampling control circuit 101 during the sampling process can be increased according to the charged voltage obtained by the sampling control circuit 101 in the charging mode under the driving of the driving signal, so as to improve the voltage sampling speed and voltage sampling efficiency based on the increased sampling current, and reduce the time required for voltage sampling. In addition, by setting multiple working modes of the main circuit 102, it is conducive to realizing the diverse functions of the sampling control circuit 101, such as the charging function and the sampling function, and thus it is conducive to improving the applicability of the circuit.

[0094] Embodiment 2

[0095] See also Figure 6 , Figure 6 is a flow chart of a control method for sampling voltage disclosed in an embodiment of the present application. Figure 6The control method for sampling voltage described above can be applied to an electronic product provided with a control circuit capable of sampling voltage, wherein the control circuit for sampling voltage comprises a sampling control circuit and a main circuit, wherein a first end of the sampling control circuit is electrically connected to a first end of the main circuit, a second end of the sampling control circuit is used to access a drive signal, a third end of the sampling control circuit is used to electrically connect to a battery management system, a second end of the main circuit is used to access a pre-charge switch signal, and a fourth end of the sampling control circuit and a third end of the main circuit are both used to be grounded; Figure 6 As shown, the control method for sampling voltage may include the following operations:

[0096] 201. The main circuit receives a pre-charge switch signal.

[0097] 202. The main circuit controls the working mode of the main circuit according to the pre-charge switch signal.

[0098] In the embodiment of the present application, the working mode of the main circuit includes a charging mode or a sampling mode.

[0099] 203. The main circuit performs a preset control operation on the sampling control circuit according to the working mode of the main circuit.

[0100] In the embodiment of the present application, the preset control operation includes a charging operation or a voltage sampling operation, wherein the execution priority of the charging operation is higher than the execution priority of the voltage sampling operation. Specifically, when the pre-charge switch signal is a switch closing signal, the working mode of the main circuit is a charging mode, and the preset control operation is a charging operation; when the pre-charge switch signal is a switch opening signal, the working mode of the main circuit is a sampling mode, and the preset control operation is a voltage sampling operation.

[0101] It should be noted that, for other related descriptions of the control circuit for sampling voltage, please refer to the other descriptions of the control circuit for sampling voltage in Embodiment 1, which will not be repeated here.

[0102] It can be seen that implementation Figure 6The control method for sampling voltage described above receives a pre-charge switch signal through the main circuit 102; and when the pre-charge switch signal is a switch closing signal, controls the main circuit 102 to enter a charging mode, and performs a charging operation on the sampling control circuit 101 through the main circuit 102, so that the sampling control circuit 101 can be pre-charged quickly and accurately when the main circuit 102 is connected to the switch closing signal. Then, when the pre-charge switch signal is transformed into a switch disconnection signal and the sampling control circuit is connected to the driving signal, controls the main circuit 102 to enter a sampling mode, and controls the sampling control circuit 101 through the main circuit 102 to perform a voltage sampling operation on the battery management system, so that when the switch is disconnected, the sampling current output by the sampling control circuit 101 during the sampling process can be increased according to the charged voltage obtained by the sampling control circuit 101 in the charging mode under the driving of the driving signal, thereby facilitating the improvement of the voltage sampling speed and voltage sampling efficiency based on the improved sampling current, and facilitating the reduction of the time required for voltage sampling, and facilitating the realization of the diverse functions of the sampling control circuit 101, such as the charging function and the sampling function, by setting a plurality of working modes of the main circuit 102, thereby facilitating the improvement of the applicability of the circuit.

[0103] Embodiment 3

[0104] See also Figure 7 , Figure 7 It is a structural schematic diagram of a control device disclosed in an embodiment of the present application. The control device is an electronic product provided with a circuit capable of sampling voltage, and the control device includes a device body, the control device also includes a control circuit for sampling voltage as in Embodiment 1 and is used to implement the control method for sampling voltage in Embodiment 2 above, and the device body is used to place the control circuit for sampling voltage. It should be noted that for a detailed description of the control circuit for sampling voltage, please refer to the specific description of the relevant content in Embodiment 1, which will not be repeated in this embodiment.

[0105] It can be seen that implementation Figure 7The control device described receives a pre-charge switch signal through the main circuit 102; and when the pre-charge switch signal is a switch closing signal, controls the main circuit 102 to enter a charging mode, and performs a charging operation on the sampling control circuit 101 through the main circuit 102, so that the sampling control circuit 101 can be pre-charged quickly and accurately when the main circuit 102 is connected to the switch closing signal. Subsequently, when the pre-charge switch signal is transformed into a switch disconnection signal and the sampling control circuit is connected to the driving signal, the main circuit 102 is controlled to enter a sampling mode, and the sampling control circuit 101 is controlled by the main circuit 102 to perform a voltage sampling operation on the battery management system. When the switch is disconnected, the sampling current output by the sampling control circuit 101 during the sampling process can be increased according to the charged voltage obtained by the sampling control circuit 101 in the charging mode under the driving of the driving signal, thereby facilitating the improvement of the voltage sampling speed and voltage sampling efficiency based on the improved sampling current, and facilitating the reduction of the time required for voltage sampling, and by setting a plurality of working modes of the main circuit 102, it is conducive to realizing the diverse functions of the sampling control circuit 101, such as the charging function and the sampling function, thereby facilitating the improvement of the applicability of the circuit.

[0106] The above is a detailed introduction to a control circuit, method and control device for sampling voltage disclosed in an embodiment of the present application. Specific embodiments are used in this article to illustrate the principles and implementation methods of the present application, but the above preferred embodiments are not used to limit the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for a person skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation method and the scope of application without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be based on the scope defined in the claims.

Claims

1. A control circuit for sampling voltage, characterized in that: The control circuit comprises a sampling control circuit (101) and a main circuit (102), wherein: The first end of the sampling control circuit (101) is electrically connected to the first end of the main circuit (102); the second end of the sampling control circuit (101) is used to access a drive signal; the third end of the sampling control circuit (101) is used to electrically connect to a battery management system; the second end of the main circuit (102) is used to access a pre-charge switch signal; and the fourth end of the sampling control circuit (101) and the third end of the main circuit (102) are both used to be grounded; The main circuit (102) is used to control the main circuit (102) to perform a preset control operation on the sampling control circuit (101) according to the pre-charge switch signal, wherein the preset control operation includes a charging operation and / or a voltage sampling operation.

2. The control circuit for sampling voltage according to claim 1, characterized in that: The main circuit (102) comprises a pre-charging circuit (1021) and a control chip (1022), wherein: A first end of the pre-charging circuit (1021) is electrically connected to a first end of the control chip (1022); a second end of the pre-charging circuit (1021) is electrically connected to a first end of the sampling control circuit (101) and a second end of the control chip (1022); a third end of the pre-charging circuit (1021) is used to receive the pre-charging switch signal; and a fourth end of the pre-charging circuit (1021) is used to be grounded; The control chip (1022) is used to charge the pre-charging circuit (1021) according to the charging voltage output by the control chip (1022) to obtain a pre-charging voltage; The pre-charging circuit (1021) is used to control the sampling control circuit (101) to output a first sampling voltage to the control chip (1022) according to the pre-charging switch signal and the driving signal.

3. The control circuit for sampling voltage according to claim 2, characterized in that: The pre-charging circuit (1021) comprises a pre-charging switch device (Q1), a pre-charging capacitor (C1) and a pre-charging resistor (R1), wherein: The first pole of the pre-charge switch device (Q1) is electrically connected to the first end of the sampling control circuit (101) and the second end of the control chip (1022); the second pole of the pre-charge switch device (Q1) is used to receive the pre-charge switch signal; the third pole of the pre-charge switch device (Q1) is electrically connected to one end of the pre-charge capacitor (C1) and one end of the pre-charge resistor (R1); the other end of the pre-charge resistor (R1) is electrically connected to the first end of the control chip (1022); and the other end of the pre-charge capacitor (C1) is used to be grounded.

4. The control circuit for sampling voltage according to claim 3, characterized in that: The main circuit (102) further comprises a current limiting module (1023), wherein: The first end of the current limiting module (10211) is electrically connected to the other end of the pre-charging resistor (R1), and the second end of the current limiting module (10211) is electrically connected to the first end of the control chip (1022); The current limiting module (10211) is used to control the current direction of each component of the main circuit (102) to flow from the control chip (1022) to the pre-charging resistor (R1).

5. The control circuit for sampling voltage according to any one of claims 1 to 4, characterized in that: The sampling control circuit (101) comprises a voltage sampling circuit (1011) and a filter charging circuit (1012), wherein: The first end of the voltage sampling circuit (1011) is electrically connected to the first end of the filter charging circuit (1012); the second end of the voltage sampling circuit (1011) is used to access the drive signal; the third end of the voltage sampling circuit (1011) is used to electrically connect to the battery management system; the second end of the filter charging circuit (1012) is electrically connected to the second end of the pre-charging circuit (1021) in the main circuit (102) and the second end of the control chip (1022) in the main circuit (102); the fourth end of the voltage sampling circuit (1011) and the third end of the filter charging circuit (1012) are both used to be grounded; The filter charging circuit (1012) is used to charge the filter charging circuit (1012) according to the pre-charging voltage output by the pre-charging circuit (1021), obtain the auxiliary sampling voltage, and provide the auxiliary sampling voltage to the voltage sampling circuit (1011); The voltage sampling circuit (1011) is used to output a first sampling voltage according to the pre-charging switch signal and the driving signal under the power supply of the filter charging circuit (1012); The filter charging circuit (1012) is also used to filter the pre-charge switch signal and the drive signal.

6. The control circuit for sampling voltage according to claim 5, characterized in that: The voltage sampling circuit (1011) comprises a voltage dividing module (10111) and a driving module (10112), wherein: The first end of the driving module (10112) is electrically connected to the first end of the filter charging circuit (1012), the second end of the driving module (10112) is used to receive the driving signal, the third end of the driving module (10112) is electrically connected to the first end of the voltage dividing module (10111), the second end of the voltage dividing module (10111) is electrically connected to the battery management system, and the fourth end of the driving module (10112) is used to be grounded; The driving module (10112) is used to control the voltage dividing module (10111) to step down the voltage output by the battery management system to obtain a first sampling voltage when the received pre-charging switch signal is the switch disconnection signal and the voltage sampling circuit (1011) is connected to the driving signal.

7. The control circuit for sampling voltage according to claim 6, characterized in that: The driving module (10112) comprises a driving switch device (Q2) and a protection resistor (R2), wherein: The first pole of the driving switch device (Q2) is electrically connected to one end of the protection resistor (R2) and the first end of the filter charging circuit (1012); the second pole of the driving switch device (Q2) is used to access the driving signal; the third pole of the driving switch device (Q2) is electrically connected to the first end of the voltage divider module (10111); and the other end of the protection resistor (R2) is used to be grounded.

8. The control circuit for sampling voltage according to claim 7, characterized in that: The driving switch device (Q2) comprises a MOS tube or a triode, wherein: When the driving switch device (Q2) is a MOS tube, the first electrode of the driving switch device (Q2) is a source electrode, the second electrode of the driving switch device (Q2) is a gate electrode, and the third electrode of the driving switch device (Q2) is a drain electrode; When the driving switch device (Q2) is a triode, the first electrode of the driving switch device (Q2) is the emitter, the second electrode of the driving switch device (Q2) is the base, and the third electrode of the driving switch device (Q2) is the collector.

9. A control method for sampling voltage, characterized in that: The method is applied to a control circuit for sampling voltage, wherein the control circuit includes a sampling control circuit and a main circuit, wherein a first end of the sampling control circuit is electrically connected to a first end of the main circuit, a second end of the sampling control circuit is used to access a driving signal, a third end of the sampling control circuit is used to electrically connect to a battery management system, a second end of the main circuit is used to access a pre-charge switch signal, and a fourth end of the sampling control circuit and a third end of the main circuit are both used to be grounded; the method includes: The main circuit receives the pre-charge switch signal; and controls the working mode of the main circuit according to the pre-charge switch signal, wherein the working mode of the main circuit includes a charging mode or a sampling mode; The main circuit performs a preset control operation on the sampling control circuit according to the working mode of the main circuit, the preset control operation includes a charging operation or a voltage sampling operation, and the execution priority of the charging operation is higher than the execution priority of the voltage sampling operation; Among them, when the pre-charge switch signal is a switch closing signal, the working mode of the main circuit is the charging mode, and the preset control operation is the charging operation; when the pre-charge switch signal is a switch opening signal, the working mode of the main circuit is the sampling mode, and the preset control operation is the voltage sampling operation.

10. A control device, comprising a device body, characterized in that: The control device further comprises a control circuit for sampling a voltage as claimed in any one of claims 1 to 8.

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