Control circuit and control equipment for sampling voltage

Abstract

The utility model relates to the technical field of voltage sampling, and discloses a control circuit and a control device for sampling voltage, the circuit comprises a sampling control circuit, a pre-charging circuit and a control chip, the pre-charging circuit is charged through the charging voltage of the control chip to obtain a pre-charging voltage, and when a pre-charging switching signal is a closing signal, the pre-charging circuit is switched on to obtain the pre-charging voltage. A pre-charging voltage and a charging voltage are provided for a sampling control circuit through a pre-charging circuit, the sampling control circuit is triggered to enable a first sampling voltage corresponding to a battery management system to flow to a control chip according to a driving signal, and the control chip calculates the first sampling voltage according to a preset voltage amplification factor to obtain a second sampling voltage; therefore, the process is repeated. 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, 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, in particular to a control circuit and a control device for sampling voltage. BACKGROUND

[0002] At present, the high-voltage BMS (Battery Management System) system usually has the demand for sampling the total voltage of the battery pack, and the traditional total voltage sampling method mainly includes: 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, and the voltage across the sampling capacitor after charging is the voltage to be sampled.

[0003] However, it is found in practice that, in the process of charging the ADC sampling capacitor by the high-voltage source through the sampling resistor, since the resistance value of the sampling resistor is usually large, it is easy to cause small sampling current, thereby causing slow sampling speed and long time consumption. Therefore, it is particularly important to propose a technical solution for improving the voltage sampling speed of the battery pack. CONTENT OF THE INVENTION

[0004] The present application provides a control circuit and a control device for sampling voltage, which can pre-charge the sampling control circuit through the main circuit before voltage sampling to improve the sampling current in the subsequent voltage sampling process, thereby facilitating the improvement of voltage sampling speed and the reduction of sampling time.

[0005] In order to solve the above technical problems, the present application discloses a control circuit for sampling voltage, which comprises 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 for connecting a driving signal, the third end of the sampling control circuit 101 is used for electrically connecting a battery management system, the second end of the main circuit 102 is used for connecting 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 for grounding;

[0007] The main circuit 102 is used for receiving the pre-charge switch signal, controlling the working mode of the main circuit 102 according to the pre-charge switch signal, and performing a preset control operation on the sampling control circuit 101 according to the working mode of the main circuit 102, 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 that of the voltage sampling operation.

[0008] When the pre-charge switch signal is a switch-on 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-off signal, the working mode of the main circuit 102 is the sampling mode, and the preset control operation is the voltage sampling operation.

[0009] As an optional implementation, in the first aspect of the present application, the main circuit 102 comprises a pre-charge circuit 1021 and a control chip 1022, wherein:

[0010] The first end of the pre-charge circuit 1021 is electrically connected to the first end of the control chip 1022, the second end of the pre-charge 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-charge circuit 1021 is used for accessing the pre-charge switch signal, and the fourth end of the pre-charge circuit 1021 is used for grounding;

[0011] The control chip 1022 is configured to charge the pre-charge circuit 1021 according to a charging voltage output by the control chip 1022 to obtain a pre-charge voltage.

[0012] The pre-charge circuit 1021 is configured to control the sampling control circuit 101 to output a first sampling voltage to the control chip 1022 according to the pre-charge switch signal and the driving signal.

[0013] As an optional implementation, in the first aspect of the present application, the pre-charge circuit 1021 comprises a pre-charge switch device Q1, a pre-charge capacitor C1 and a pre-charge resistor R1, wherein:

[0014] 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 for accessing 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.

[0015] As an optional implementation, in the first aspect of the present application, the main circuit 102 further comprises a current limiting module 1023, wherein:

[0016] The first end of the current limiting module 1023 is electrically connected to the other end of the pre-charge resistor R1, and the second end of the current limiting module 1023 is electrically connected to the first end of the control chip 1022.

[0017] The current limiting module 1023 is configured to control the current direction of each component of the main circuit 102 to be from the control chip 1022 to the pre-charge resistor R1.

[0018] As an optional implementation, in the first aspect of the application, the sampling control circuit 101 comprises a voltage sampling circuit 1011 and a filter charging circuit 1012, wherein:

[0019] 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 configured to be connected to the driving signal, the third end of the voltage sampling circuit 1011 is configured to be electrically connected to the battery management system, the second end of the filter charging circuit 1012 is electrically connected to the second end of the pre-charge 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 configured to be grounded.

[0020] The filter charging circuit 1012 is configured to charge the filter charging circuit 1012 according to the pre-charge voltage output by the pre-charge circuit 1021 to obtain an auxiliary sampling voltage, and provide the auxiliary sampling voltage to the voltage sampling circuit 1011.

[0021] The voltage sampling circuit 1011 is configured to output a first sampling voltage according to the pre-charge switch signal and the driving signal under the power supply of the filter charging circuit 1012.

[0022] The filter charging circuit 1012 is further configured to filter the pre-charge switch signal and the driving signal.

[0023] As an optional implementation, in the first aspect of the application, the voltage sampling circuit 1011 comprises a voltage dividing module 10111 and a driving module 10112, wherein:

[0024] 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 configured to be connected to the driving signal, the third end of the driving module 10112 is electrically connected to the first end of the voltage dividing module 10111, and 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 configured to be grounded.

[0025] The driving module 10112 is configured to control the voltage dividing module 10111 to obtain a first sampling voltage by reducing the voltage output by the battery management system when the received pre-charge switch signal is the switch-off signal and the voltage sampling circuit 1011 is connected to the driving signal.

[0026] As an optional implementation, in the first aspect of the application, the driving module 10112 comprises a driving switch device Q2 and a protection resistor R2, wherein:

[0027] 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 configured to be connected to the driving signal, the third pole of the driving switch device Q2 is electrically connected to the first end of the voltage dividing module 10111, and the other end of the protection resistor R2 is configured to be grounded.

[0028] As an optional implementation, in the first aspect of the application, the driving switch device Q2 comprises a MOS tube or a triode, wherein:

[0029] When the driving switch device Q2 is a MOS tube, the first pole of the driving switch device Q2 is a source pole, the second pole of the driving switch device Q2 is a gate pole, and the third pole of the driving switch device Q2 is a drain pole;

[0030] When the driving switch device Q2 is a triode, the first pole of the driving switch device Q2 is an emitter pole, the second pole of the driving switch device Q2 is a base pole, and the third pole of the driving switch device Q2 is a collector pole.

[0031] The second aspect of the application discloses a control method for sampling voltage, which is applied to a control circuit for sampling voltage, wherein the control circuit comprises a sampling control circuit and a main circuit, wherein the first end of the sampling control circuit is electrically connected to the first end of the main circuit, the second end of the sampling control circuit is configured to be connected to a driving signal, the third end of the sampling control circuit is configured to be electrically connected to a battery management system, the second end of the main circuit is configured to be connected to a pre-charge switch signal, and the fourth end of the sampling control circuit and the third end of the main circuit are both configured to be grounded; the method comprises the following steps:

[0032] The main circuit receives the pre-charge switch signal; and according to the pre-charge switch signal, the working mode of the main circuit is controlled, wherein the working mode of the main circuit comprises a charging mode or a sampling mode;

[0033] 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 including a charging operation or a voltage sampling operation, the charging operation having a higher execution priority than the voltage sampling operation.

[0034] When the pre-charge switch signal is a switch-on 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-off signal, the working mode of the main circuit is the sampling mode, and the preset control operation is the voltage sampling operation.

[0035] The third aspect of the present application discloses a control device, the control device comprising a device body, the control device further comprising the control circuit for sampling voltage according to any one of the first aspect of the present application.

[0036] The present application has the following beneficial effects:

[0037] In the 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 for accessing a driving signal, a third end of the sampling control circuit 101 is used for electrically connecting a battery management system, a second end of the main circuit 102 is used for accessing a pre-charging switch signal, a fourth end of the sampling control circuit 101 and a third end of the main circuit 102 are both used for grounding; the main circuit 102 is used for receiving the pre-charging switch signal; and according to the pre-charging switch signal, the working mode of the main circuit 102 is controlled; and according to the working mode of the main circuit 102, a preset control operation is performed on the sampling control circuit 101, the working mode of the main circuit 102 comprises a charging mode or a sampling mode, the preset control operation comprises a charging operation or a voltage sampling operation, the execution priority of the charging operation is higher than that of the voltage sampling operation; when the pre-charging switch signal is a switch-on 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-charging switch signal is a switch-off 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, by implementing the application, the main circuit 102 receives the pre-charging switch signal; and when the pre-charging switch signal is the switch-on signal, the main circuit 102 is controlled to enter the charging mode, and the main circuit 102 performs the 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 accesses the switch-on signal; then, when the pre-charging switch signal is changed to the switch-off signal and the sampling control circuit accesses 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 the voltage sampling operation on the battery management system, so that the sampling current output by the sampling control circuit 101 in the sampling process can be increased based on the charged voltage obtained by the sampling control circuit 101 in the charging mode under the driving of the driving signal when the switch is off, thereby being conducive to increasing the voltage sampling speed and the voltage sampling efficiency based on the increased sampling current, and being conducive to reducing the time consumed for voltage sampling, and by setting multiple working modes of the main circuit 102, the diversity function of the sampling control circuit 101, such as the charging function and the sampling function, can be realized, thereby being conducive to improving the applicability of the circuit. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor based on these drawings.

[0039] Figure 1 is a structural schematic diagram of a control circuit for sampling voltage disclosed by an embodiment of the present application;

[0040] Figure 2 is a structural schematic diagram of another control circuit for sampling voltage disclosed by an embodiment of the present application;

[0041] Figure 3 is a relationship curve diagram of sampling voltage and sampling time under pre-charge control of a pre-charge circuit disclosed by an embodiment of the present application;

[0042] Figure 4 is a relationship curve diagram of sampling voltage and sampling time under pre-charge control of a pre-charge circuit disclosed by an embodiment of the present application;

[0043] Figure 5 is a structural schematic diagram of still another control circuit for sampling voltage disclosed by an embodiment of the present application;

[0044] Figure 6 is a flow schematic diagram of a control method for sampling voltage disclosed by an embodiment of the present application;

[0045] Figure 7 is a structural schematic diagram of a control device disclosed by an embodiment of the present application. DETAILED DESCRIPTION

[0046] In order to better understand and implement, the technical solutions in the embodiments of the present application will be clearly and completely described in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0047] It should be noted that, unless otherwise explicitly specified and limited, the term "electrically connected" in the specification and claims of the present application and the above-mentioned drawings should be understood broadly, for example, it can be a fixed electrically connected, or a detachable electrically connected, or an integral electrically connected; it can be a mechanical electrically connected, or an electrical electrically connected or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. In addition, the terms "first", "second" and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish different objects, and are not used to describe a specific order, and the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0048] Embodiment one

[0049] Please refer to Figure 1 , Figure 1 is a flowchart of a control method for sampling voltage disclosed by the embodiments of the present application. Wherein, Figure 1 The control method for sampling voltage described can be applied to any electronic product that needs to sample voltage, and the embodiments of the present application are not limited. As Figure 1 The control circuit for sampling voltage includes a sampling control circuit 101 and a main circuit 102, wherein:

[0050] 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 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;

[0051] The main circuit 102 is used to receive the pre-charge switch signal; and according to the pre-charge switch signal, the working mode of the main circuit 102 is controlled; and according to the working mode of the main circuit 102, the preset control operation of the sampling control circuit 101 is executed, 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.

[0052] In the 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 the switch-on 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 the switch-off 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 the voltage sampling operation is performed, the switch-on signal is connected, so that the main circuit 102 enters 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-on signal to the switch-off signal, so that the main circuit 102 enters the sampling mode; at this time, if the sampling control circuit 101 connects the driving signal, the main circuit 102 is prompted to control the sampling control circuit 101 to perform the voltage sampling operation on the battery management system according to the charged voltage obtained by the sampling control circuit in the charging mode.

[0053] It can be seen that the implementation Figure 1 The control circuit for sampling voltage described in the present application receives the pre-charge switch signal through the main circuit 102; when the pre-charge switch signal is the switch-on signal, the main circuit 102 is controlled to enter the charging mode, and the charging operation is performed 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 connects the switch-on signal; then, when the pre-charge switch signal is changed to the switch-off signal and the sampling control circuit connects the driving signal, the main circuit 102 is controlled to enter the sampling mode, and the sampling control circuit 101 is controlled to perform the voltage sampling operation on the battery management system through the main circuit 102, so that the sampling current output by the sampling control circuit 101 in 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 when the switch is off, thereby facilitating the improvement of the voltage sampling speed and the voltage sampling efficiency based on the increased sampling current, and reducing the time required for voltage sampling. In addition, by setting multiple working modes of the main circuit 102, the diversity function of the sampling control circuit 101, such as the charging function and the sampling function, can be realized, thereby improving the applicability of the circuit.

[0054] In an optional embodiment, as Figure 2 shown, Figure 2 is another structure diagram of a control circuit for sampling voltage disclosed in the embodiment of the present application, as Figure 2 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-charge circuit 1021 and a control chip 1022, wherein:

[0055] A first end of the pre-charge circuit 1021 is electrically connected to a first end of the control chip 1022, a second end of the pre-charge 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-charge circuit 1021 is configured to be connected to a pre-charge switch signal, and a fourth end of the pre-charge circuit 1021 is configured to be grounded.

[0056] The control chip 1022 is configured to charge the pre-charge circuit 1021 according to a charging voltage output by the control chip 1022 to obtain a pre-charge voltage.

[0057] The pre-charge circuit 1021 is configured to control the sampling control circuit 101 to output a first sampling voltage to the control chip 1022 according to the pre-charge switch signal and a driving signal.

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

[0059] When the pre-charge switch signal received by the pre-charge circuit 1021 is a switch closing signal, the pre-charge circuit 1021 provides the pre-charge voltage to the sampling control circuit 101, and provides the charging voltage to the sampling control circuit 101 through the pre-charge circuit 1021 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 driving signal received.

[0060] In the optional embodiment, the control chip 1022 is further configured to amplify the first sampling voltage according to a preset voltage amplification multiple to obtain a second sampling voltage, update the charging voltage according to the second sampling voltage, and repeatedly perform the operation of charging the pre-charge circuit 1021 according to the charging voltage output by the control chip 1022 to obtain the pre-charge voltage.

[0061] Optionally, the charging voltage output by the control chip 1022 can be the second sampling voltage collected by the control chip 1022, or the voltage difference between the charging voltage and the second sampling voltage can be less than or equal to a preset voltage difference, which is not limited in the embodiment of the application.

[0062] As shown in FIG. 1, Figure 3 As shown in FIG. 1, Figure 3 is a relationship curve between the sampling voltage and the sampling time under the pre-charge control without the pre-charge circuit, wherein the time required for the control chip 1022 to collect a stable voltage is 14 milliseconds in the case that no pre-charge circuit is set or the pre-charge circuit does not have a pre-charged voltage in advance; and Figure 4 As shown in FIG. 1, Figure 4is a relationship curve diagram between the sampling voltage and the sampling time under the pre-charge control of the pre-charge circuit disclosed by the embodiment of the present application. In the case that the pre-charge circuit is pre-charged with voltage, the time required for the control chip 1022 to collect stable voltage is only 1.5 milliseconds, that is, the sampling time required by the sampling scheme provided by the embodiment of the present application is reduced by 89% compared with the sampling time required by the traditional sampling scheme under the pre-charge control of the pre-charge circuit in the prior art.

[0063] It can be seen that the optional embodiment can obtain the pre-charge voltage by controlling the pre-charge circuit 1021 to be charged by the control chip 1022 according to the charging voltage output by the control chip 1022, and provide the pre-charge voltage to the sampling control circuit 101 and provide the charging voltage to the sampling control circuit 101 through the pre-charge circuit 1021 when the received pre-charge switch signal is the closed switch signal, 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 the pre-set voltage amplification multiple to obtain the second sampling voltage, updates the charging voltage according to the second sampling voltage, and repeatedly performs the operation of charging the pre-charge circuit 1021 according to the charging voltage output by the control chip 1022 to obtain the pre-charge voltage. By setting the main circuit 102, the pre-charge circuit 1021 in the main circuit 102 can store the pre-charge voltage provided by the sampling control circuit 101 and the charging voltage provided by the control chip 1022 in the main circuit 102 to the sampling control circuit 101 through the pre-charge circuit 1021, and the sampling control circuit 101 can increase the sampling current flowing through each component in the sampling control circuit 101 by the stored voltage in the sampling control circuit 101 during the subsequent voltage sampling operation of the sampling control circuit 101, so as to realize fast and accurate collection of the required sampling control circuit 101, which is beneficial to greatly reduce the required sampling time. In addition, the control chip 1022 can update the charging voltage in time according to the latest collected sampling voltage, which is beneficial to improve the accuracy and efficiency of the updated charging voltage. Repeating the process is beneficial to improve the control flexibility of the circuit and improve the applicability of the circuit.

[0064] In this optional embodiment, as an optional implementation, as shown in Figure 5 Figure 5 is another structure diagram of a control circuit for sampling voltage disclosed by the embodiment of the present application, as shown in Figure 5 ​As shown, the pre-charge circuit 1021 includes a pre-charge switching device Q1, a pre-charge capacitor C1 and a pre-charge resistor R1, wherein the first pole of the pre-charge switching 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 switching device Q1 is used to access a pre-charge switching signal, the third pole of the pre-charge switching 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 ground.

[0065] The pre-charge resistor R1 is used to flow the received charging voltage of 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 switching 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 accessed pre-charge switching signal is the on-off signal.

[0066] Optionally, the pre-charge switching device Q1 can include a MOS tube, a triode or any other device or component capable of playing the same switching role, and the embodiments of the present application are not limited. Figure 5 As shown, when the pre-charge switching device Q1 is a MOS tube, the first pole of the pre-charge switching device Q1 is the drain, the second pole of the pre-charge switching device Q1 is the gate, and the third pole of the pre-charge switching device Q1 is the source; when the pre-charge switching device Q1 is a triode, the first pole of the pre-charge switching device Q1 is the collector, the second pole of the pre-charge switching device Q1 is the base, and the third pole of the pre-charge switching device Q1 is the emitter.

[0067] It can be seen that the optional embodiment can replace the pre-charge switching device Q1 according to the voltage required by the accessed electronic components, that is, if the voltage required by the electronic components is higher, the pre-charge switching device Q1 can be directly replaced by a switching device with higher voltage resistance, so as to meet the needs of electronic components with different voltages, and the circuit of the present application is more adaptable.

[0068] In the optional embodiment, as shown in Figure 5 The main circuit 102 further includes a current limiting module 1023, wherein the first end of the current limiting module 1023 is electrically connected to the other end of the pre-charge resistor R1, and the second end of the current limiting module 1023 is electrically connected to the 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 be the direction from the control chip 1022 to the pre-charge resistor R1.

[0069] Optionally, the current limiting module 1023 can include a diode, a current limiting resistor or any other device or component capable of playing the same current limiting role, and the embodiments of the present application are not limited.

[0070] AsFigure 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-charge resistor R1, so that 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-charge resistor R1.

[0071] It can be seen that the optional embodiment can also achieve accurate charging of the pre-charge capacitor under the limiting effect of the current limiting module 1023, avoid the situation that the pre-charge voltage is mistakenly provided to the control chip during the process of the subsequent pre-charge capacitor powering the sampling control circuit, and help to realize the sampling process of the circuit corresponding to the present scheme.

[0072] In another optional embodiment, as shown in the figure, Figure 5 The sampling control circuit 101 includes a voltage sampling circuit 1011 and a filter charging circuit 1012, wherein:

[0073] 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 a driving signal, the third end of the voltage sampling circuit 1011 is used to electrically connect to a battery management system, the second end of the filter charging circuit 1012 is electrically connected to the second end of the pre-charge 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;

[0074] The filter charging circuit 1012 is configured to charge the filter charging circuit 1012 according to the pre-charge voltage output by the pre-charge circuit 1021, obtain an auxiliary sampling voltage, and provide the auxiliary sampling voltage to the voltage sampling circuit 1011;

[0075] The voltage sampling circuit 1011 is configured to output a first sampling voltage according to the pre-charge switch signal and the driving signal under the power supply of the filter charging circuit 1012;

[0076] The filter charging circuit 1012 is further configured to filter the pre-charge switch signal and the driving signal.

[0077] In this optional embodiment, the voltage sampling circuit 1011 outputs a first sampling voltage according to the pre-charge switch signal and the driving signal under the power supply of the filter charging circuit 1012, and the manner specifically includes:

[0078] When the received precharge switch signal is a switch-off 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.

[0079] 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 specific ways:

[0080] When the precharge switch signal changes between a switch closed signal and a switch open signal, the filter charging circuit 1012 filters the precharge switch signal; and / or, when a drive signal is received, the drive signal is filtered.

[0081] As can be seen, this optional embodiment can charge the filter charging circuit 1012 according to the pre-charge voltage output by the pre-charge circuit 1021 to obtain an 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 open signal and the voltage sampling circuit 1011 is connected to a drive 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; and when the pre-charge switch signal changes between a switch closed signal and a switch open signal, the filter charging circuit 1012 filters the pre-charge switch signal; 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, thereby 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 helps to reduce the time required for sampling, and can also filter the signal connected to the circuit through the filter charging circuit to reduce noise interference during the sampling process.

[0082] In this optional embodiment, as an optional implementation method, such as Figure 5 As shown, the voltage sampling circuit 1011 includes a voltage divider module 10111 and a driver module 10112, wherein:

[0083] The first terminal of the drive module 10112 is electrically connected to the first terminal of the filter charging circuit 1012, the second terminal of the drive module 10112 is used to receive the drive signal, the third terminal of the drive module 10112 is electrically connected to the first terminal of the voltage divider module 10111, the second terminal of the voltage divider module 10111 is electrically connected to the battery management system, and the fourth terminal of the drive module 10112 is used to ground.

[0084] The driving module 10112 is configured to control the voltage dividing module 10111 to reduce the voltage output by the battery management system to obtain a first sampling voltage when the received pre-charging switch signal is a switch-off signal and the voltage sampling circuit 1011 is connected to the driving signal.

[0085] It can be seen that the optional embodiment can control the voltage dividing module 10111 to reduce the voltage output by the battery management system to obtain a first sampling voltage when the received pre-charging switch signal is a switch-off signal and the voltage sampling circuit 1011 is connected to the driving signal through the driving module 10112. The voltage output by the battery management system can be reduced through the voltage dividing module 10111, which can improve the voltage sampling speed and efficiency of the control chip 1022 to a certain extent, and can also reduce the risk of the control chip being damaged by high voltage by reducing the voltage in the circuit, thereby reducing the cost required for voltage sampling.

[0086] In the optional embodiment, as shown in Figure 5 The driving module 10112 includes a driving switch device Q2 and a protection resistor R2. 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 configured to be connected to the driving signal. The third pole of the driving switch device Q2 is electrically connected to the first end of the voltage dividing module 10111. The other end of the protection resistor R2 is configured to be grounded. 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, a triode, or any other device or component that can perform the same switching function. The embodiments of the present application are not limited. As shown in Figure 5 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.

[0087] It can be seen that the optional embodiment 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 switch device with higher voltage resistance. This can meet the needs of electronic components with different voltages, and the circuit of the present solution is more adaptable.

[0088] In the embodiment of the present application, the voltage dividing module 10111 can include at least one voltage dividing resistor arranged between the battery management system and the driving switch device Q2 in sequence. When the number of voltage dividing resistors is 1, one end of the voltage dividing resistor is electrically connected to the battery management system, and the other end of the voltage dividing resistor is electrically connected to the third electrode of the driving switch device Q2. When the number of voltage dividing resistors is greater than 1, each voltage dividing resistor is connected in series with each other, Figure 5 The voltage dividing module 10111 composed of 4 voltage dividing resistors (e.g. Figure 5 R4, R5, R6 and R7) is shown in the figure. By providing a variety of voltage dividing resistors, the voltage output by the battery management system can be accurately reduced to the sampling voltage range required by the control chip, which is beneficial to improve the accuracy and reliability of the first sampling voltage obtained by reduction.

[0089] In the embodiment of the present application, the filter charging circuit 1012 can include a filter resistor R3, a first filter capacitor C2 and a second filter capacitor C3, as shown in Figure 5 The one end of the filter resistor R3 is electrically connected to the one end of the first filter capacitor C2, the first electrode of the driving switch device Q2 and the one end of the protection resistor R2, the other end of the filter resistor R3 is electrically connected to the one end of the second filter capacitor C3, the first electrode of the pre-charging 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. The pre-charge voltage output by the pre-charging circuit can be stored in the first filter capacitor C2 and / or the second filter capacitor C3. In addition, the first filter capacitor C2 can filter the driving signal when receiving the driving signal; the second filter capacitor C3 can filter the pre-charging switch signal when the pre-charging switch signal changes between the switch-on signal and the switch-off signal. By storing the pre-charge voltage provided by the pre-charging circuit into the filter charging circuit 1012 through the first filter capacitor C2 and the second filter capacitor C3 to obtain an auxiliary sampling voltage, a greater sampling current can be provided for the voltage sampling operation of the subsequent voltage sampling circuit 1011, and the two filter capacitors can filter the noise in the circuit, which is beneficial to reduce the interference of the noise.

[0090] In the embodiment of the present application, the filter charging circuit 1012 can include a filter resistor R3, a first filter capacitor C2 and a second filter capacitor C3, as shown in Figure 6As shown, the control chip 1022 includes a micro control unit MCU, wherein the micro control unit MCU can 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 electrode 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 anode of the diode D1 in the pre-charging circuit 1021; the analog-to-digital converter ADC is used to convert the collected first sampling voltage signal into a first digital signal corresponding to the first sampling voltage, so as to trigger the micro control unit MCU to calculate the second sampling voltage corresponding to the second digital signal according to the preset voltage amplification multiple of the first digital signal corresponding to the first 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 the 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. The preset voltage amplification multiple can be calculated according to the number of voltage dividing resistors contained in the voltage dividing module 10111 and the resistance values of the voltage dividing resistors. In this way, by setting the analog-to-digital converter ADC and the digital-to-analog converter DAC, the micro control unit MCU can amplify and calculate the first sampling voltage according to the preset amplification multiple to obtain the second sampling voltage, update the charging voltage according to the second sampling voltage, and provide the updated charging voltage to the pre-charging circuit, which is beneficial to improve the calculation accuracy and reliability of the sampling voltage, and is beneficial to improve the accuracy and reliability of the charging voltage provided to the pre-charging circuit.

[0091] The working principle of the control circuit for sampling voltage in the embodiment of the application is as follows:

[0092] In the embodiment of the present application, before the voltage sampling circuit samples the voltage of the battery pack in the battery management system, the analog-to-digital converter ADC in the control chip 102 first outputs a charging voltage approximating the sampling voltage through the digital-to-analog converter DAC in the control chip 102, and stores the charging voltage to the pre-charge capacitor C1 through the diode D1 and the pre-charge resistor R1 in sequence, so as to charge the voltage between the pre-charge capacitor to the pre-charge voltage. Then, the pre-charge switch signal connected to the second electrode of the pre-charge switch device Q1 is converted to the switch closing signal (the pre-charge switch signal is the switch opening signal by default), at this 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 charge the filter capacitor by the pre-charge capacitor. Then, the pre-charge switch signal is converted to the switch opening signal, at this time, for the case that the pre-charge switch signal is converted between the switch closing signal and the switch opening signal, the pre-charge switch signal can be filtered by the second filter capacitor C3. When sampling, the driving signal is connected to the second electrode of the driving switch device Q2, at this time, the driving switch device Q2 is turned on, and the high voltage of the battery pack in the battery management system is controlled (such as Figure 6The HV (High Voltage) shown is divided into partial voltages by one or more voltage dividing resistors, and then flows 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 by the analog-to-digital converter ADC in the control chip 102, and then 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 amplifies the first sampling voltage corresponding to the first digital signal according to the voltage amplification factor matched with the resistance parameters (such as the number of voltage dividing resistors and the resistance values of each voltage dividing resistor) of the voltage dividing resistors in the voltage dividing module 10111 to obtain a second digital signal corresponding to the second sampling voltage, and updates the third digital signal corresponding to the charging voltage according to the second digital signal to obtain a fourth digital signal corresponding to the updated charging voltage, and then converts the fourth digital signal into the updated charging voltage through the digital-to-analog converter DAC in the control chip 102, and repeats the operation of storing the charging voltage to the pre-charge capacitor C1 through the diode D1 and the pre-charge resistor R1. It can be seen that the present scheme receives the pre-charge switch signal through the main circuit 102; and when the pre-charge switch signal is the on-off signal, the main circuit 102 is controlled to enter the charging mode, and the main circuit 102 performs the charging operation on the sampling control circuit 101, so that the pre-charge of the sampling control circuit 101 can be quickly and accurately realized when the main circuit 102 is connected to the on-off signal. Then, when the pre-charge switch signal is changed to the off 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 the voltage sampling operation on the battery management system, so that the sampling current output by the sampling control circuit 101 in 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 when the switch is off, thereby facilitating to improve the voltage sampling speed and voltage sampling efficiency based on the improved sampling current, and facilitating to reduce the time required for voltage sampling. And by setting multiple working modes of the main circuit 102, the diversity function of the sampling control circuit 101 can be realized, such as charging function, sampling function, thereby facilitating to improve the applicability of the circuit.

[0093] Embodiment Two

[0094] Please refer to Figure 6 , Figure 6 is a flowchart of a control method for sampling voltage disclosed by the embodiments of the present application. Wherein, Figure 6The described control method for sampling voltage 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 for accessing a driving signal, a third end of the sampling control circuit is used for electrically connecting a battery management system, a second end of the main circuit is used for accessing a pre-charge switch signal, a fourth end of the sampling control circuit and a third end of the main circuit are both used for grounding; as shown in the figure, the control method for sampling voltage can comprise the following operations: Figure 7 The described control method for sampling voltage 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 for accessing a driving signal, a third end of the sampling control circuit is used for electrically connecting a battery management system, a second end of the main circuit is used for accessing a pre-charge switch signal, a fourth end of the sampling control circuit and a third end of the main circuit are both used for grounding; as shown in the figure, the control method for sampling voltage can comprise the following operations:

[0095] 201, the main circuit receives the pre-charge switch signal.

[0096] 202, the main circuit controls the working mode of the main circuit according to the pre-charge switch signal.

[0097] In the embodiment of the application, the working mode of the main circuit comprises a charging mode or a sampling mode.

[0098] 203, the main circuit performs a preset control operation on the sampling control circuit according to the working mode of the main circuit.

[0099] In the embodiment of the application, the preset control operation comprises a charging operation or a voltage sampling operation, wherein the execution priority of the charging operation is higher than that of the voltage sampling operation. Specifically, when the pre-charge switch signal is a switch-on 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-off signal, the working mode of the main circuit is the sampling mode, and the preset control operation is the voltage sampling operation.

[0100] It should be noted that other related descriptions of the control circuit for sampling voltage can be referred to the other descriptions of the control circuit for sampling voltage in Embodiment I, which will not be repeated here.

[0101] It can be seen that the implementation Figure 7The described control method for sampling voltage receives a pre-charge switch signal by the main circuit 102; and when the pre-charge switch signal is an on switch signal, controls the main circuit 102 to enter a charging mode, and performs a charging operation on the sampling control circuit 101 by the main circuit 102, which can quickly and accurately realize the pre-charging of the sampling control circuit 101 when the main circuit 102 is connected to the on switch signal. Subsequently, when the pre-charge switch signal is changed to an off switch 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, which can increase the sampling current output by the sampling control circuit 101 in the sampling process under the driving of the driving signal according to the charged voltage obtained by the sampling control circuit 101 in the charging mode when the switch is off, thereby facilitating to improve the voltage sampling speed and voltage sampling efficiency based on the improved sampling current, and to reduce the time required for voltage sampling. And by setting multiple working modes of the main circuit 102, it is beneficial to realize the diversity function of the sampling control circuit 101, such as charging function, sampling function, thereby facilitating to improve the applicability of the circuit.

[0102] Embodiment three

[0103] Please refer to Figure 7 , ​ is a structural schematic diagram of a control device disclosed by the embodiment of the present application, which is an electronic product provided with a circuit capable of sampling voltage, and the control device comprises a device body, and further comprises the control circuit for sampling voltage as in embodiment one and for implementing the control method for sampling voltage in embodiment two, and the device body is used for placing the control circuit for sampling voltage. It should be noted that for the detailed description of the control circuit for sampling voltage, please refer to the specific description of the related content in embodiment one, which will not be repeated here.

[0104] It can be seen that the embodiment ​The control device described can receive a pre-charge switch signal through the main circuit 102; when the pre-charge switch signal is a switch-on signal, control the main circuit 102 to enter a charging mode, and perform 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-on signal; then when the pre-charge switch signal changes to a switch-off signal and the sampling control circuit is connected to a driving signal, control the main circuit 102 to enter a sampling mode, and control the sampling control circuit 101 to perform a voltage sampling operation on the battery management system through the main circuit 102, so that when the switch is off, the sampling current output by the sampling control circuit 101 in 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 increase of the voltage sampling speed and the voltage sampling efficiency based on the increased sampling current, and facilitating the reduction of the time required for voltage sampling, and by setting multiple working modes of the main circuit 102, the diversity function of the sampling control circuit 101 can be realized, such as the charging function and the sampling function, thereby facilitating the improvement of the applicability of the circuit.

[0105] The control circuit and control device for sampling voltage disclosed in the embodiments of the present application are described in detail above, and the principles and implementation modes of the present application are described by applying specific embodiments, but the above preferred embodiments are not intended to limit the present application, and the above embodiment descriptions are only used to help understand the method and core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, changes can be made in the specific implementation mode and application range without departing from the spirit and scope of the present application, therefore the protection scope of the present application is subject to the scope defined by the claims.

Claims

1. A control circuit for sampling a voltage, characterized by The control circuit comprises a sampling control circuit (101) and a main circuit (102), and the main circuit (102) comprises a pre-charge circuit (1021) and a control chip (1022), wherein: The first end of the pre-charge circuit (1021) is electrically connected to the first end of the control chip (1022), the second end of the pre-charge 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-charge circuit (1021) is used for accessing a pre-charge switch signal, the second end of the sampling control circuit (101) is used for accessing a driving signal, the third end of the sampling control circuit (101) is used for electrically connecting a battery management system, and the fourth end of the sampling control circuit (101) and the fourth end of the pre-charge circuit (1021) are both used for grounding; The control chip (1022) is used for charging the pre-charge circuit (1021) according to a charging voltage output by the control chip (1022) to obtain a pre-charge voltage. The pre-charge circuit (1021) is used for controlling the sampling control circuit (101) to output a first sampling voltage to the control chip (1022) according to the pre-charge switch signal and the driving signal.

2. The control circuit for sampling a voltage of claim 1, wherein, The pre-charge circuit (1021) comprises a pre-charge switch device (Q1), a pre-charge capacitor (C1) and a pre-charge 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 for accessing 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.

3. The control circuit for sampling a voltage of claim 2, wherein, The pre-charge switch device (Q1) comprises a MOS tube or a triode, wherein: When the pre-charge switch device (Q1) is the MOS tube, the first pole of the pre-charge switch device (Q1) is the drain, the second pole of the pre-charge switch device (Q1) is the gate, and the third pole of the pre-charge switch device (Q1) is the source; When the pre-charge switch device (Q1) is the triode, the first pole of the pre-charge switch device (Q1) is the collector, the second pole of the pre-charge switch device (Q1) is the base, and the third pole of the pre-charge switch device (Q1) is the emitter.

4. The control circuit for sampling a voltage according to claim 2 or 3, characterized in that, The main circuit (102) further comprises a current limiting module (1023), wherein: The first end of the current limiting module (1023) is electrically connected to the other end of the pre-charge resistor (R1), and the second end of the current limiting module (1023) is electrically connected to the first end of the control chip (1022); The current limiting module (1023) is used for controlling the current direction of each component of the main circuit (102) to be the direction from the control chip (1022) to the pre-charge resistor (R1).

5. The control circuit for sampling a voltage according to any one of claims 1-3, 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 for accessing the driving signal, the third end of the voltage sampling circuit (1011) is used for electrically connecting the battery management system, and 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; The filter charging circuit (1012) is used for charging the filter charging circuit (1012) according to the pre-charging voltage output by the pre-charging circuit (1021), obtaining an auxiliary sampling voltage, and providing the auxiliary sampling voltage to the voltage sampling circuit (1011); The voltage sampling circuit (1011) is used for outputting 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 for filtering the pre-charging switch signal and the driving signal.

6. The control circuit for sampling a voltage of claim 5, wherein, The voltage sampling circuit (1011) comprises a voltage sampling circuit (1011) 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 for accessing the driving signal, the third end of the driving module (10112) is electrically connected to the first end of the voltage sampling circuit (1011), and the fourth end of the driving module (10112) is used for grounding; The driving module (10112) is used for controlling the voltage sampling circuit (1011) to obtain a first sampling voltage by reducing the voltage output by the battery management system when the received pre-charging switch signal is the switch-off signal and the voltage sampling circuit (1011) accesses the driving signal.

7. The control circuit for sampling a voltage of claim 6, wherein, 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 for accessing the driving signal, the third pole of the driving switch device (Q2) is electrically connected to the first end of the voltage sampling circuit (1011), and the other end of the protection resistor (R2) is used for grounding.

8. The control circuit for sampling a voltage of claim 7, wherein, 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 pole of the driving switch device (Q2) is a source, the second pole of the driving switch device (Q2) is a gate, and the third pole of the driving switch device (Q2) is a drain; When the driving switch device (Q2) is a triode, the first pole of the driving switch device (Q2) is an emitter, the second pole of the driving switch device (Q2) is a base, and the third pole of the driving switch device (Q2) is a collector.

9. Control circuit for sampling a voltage according to any one of claims 6-8, characterized in that, The filter charging circuit (1012) comprises 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), 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-charging 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.

10. A control device comprising a device body, characterized by The control device further comprises a control circuit for sampling voltage according to any one of claims 1-9.

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