Peak suppression circuit, charging module and charging system

Abstract

The utility model provides a peak suppression circuit, a charging module and a charging system, and belongs to the technical field of power electronics. The peak suppression circuit comprises a direct current output module, a first reverse connection prevention module and a peak suppression module, wherein the output end of the first reverse connection prevention module is connected with the first input end of the peak suppression module, the second input end of the peak suppression module is grounded, the output end of the peak suppression module is connected with a target charging object, and the peak suppression module comprises a plurality of capacitors and at least one resistor; the resistor and the capacitor in the peak suppression module and the parasitic inductance of the transmission cable form a damping network, and the transient peak voltage of the output signal of the first reverse connection prevention module is absorbed and suppressed through the damping network. According to the invention, the peak suppression effect in the charging power supply can be improved.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular, to a spike suppression circuit, a charging module, and a charging system. Background Art

[0002] With the popularization of batteries, battery charging technology has also been developing rapidly. During the application of a charging power supply, it is necessary to have an anti-reverse connection function to protect the safety of the charging process. In addition, the charging end of the charging power supply is connected to the battery end via a cable. At the same time, filter circuits are also provided at the input end and the output end of the charging power supply to suppress electromagnetic interference, and a switch relay is built into the charging power supply to control the conduction and cut-off of the battery charging process. However, the switch relay is prone to jitter during the opening and closing process, causing the common-mode inductor in the cable and the filter capacitor in the filter circuit to resonate. The spike voltage generated by the resonance is superimposed on the anti-reverse connection device, rendering the anti-reverse connection function ineffective. Therefore, how to suppress the spike voltage on the anti-reverse connection device has become an important breakthrough in the development of charging power supplies.

[0003] In the related art, generally, a clamping circuit or an RC circuit can be introduced into the charging power supply to absorb or buffer the spike voltage on the anti-reverse connection device. However, when suppressing the spike of the anti-reverse connection device based on the related art, there is a large fluctuation range of the clamping voltage in the clamping circuit, making it difficult to ensure the spike suppression effect; the RC circuit is only suitable for absorbing spike voltages with small energy and is difficult to apply to scenarios with large lead inductance. Therefore, the solutions in the related art have the problem of poor spike suppression effect. Summary of the Utility Model

[0004] The purpose of the present application is to provide a spike suppression circuit, a charging module, and a charging system, which can improve the spike suppression effect in a charging power supply.

[0005] The embodiments of the present application are implemented as follows:

[0006] In the first aspect of the embodiments of the present application, a spike suppression circuit is provided. The spike suppression circuit includes: a DC output module, a first anti-reverse connection module, and a spike suppression module;

[0007] The first end of the DC output module is connected to an input voltage, and the first end of the DC output module is also connected to the input end of the first anti-reverse connection module. The second end of the DC output module is grounded;

[0008] The output end of the first anti-reverse connection module is connected to the first end of the spike suppression module, and the second end of the spike suppression module is grounded; the spike suppression module includes a plurality of capacitors and at least one resistor, and the spike suppression module is used to absorb and suppress the transient spike voltage of the output signal of the first anti-reverse connection module.

[0009] As a possible implementation, the DC output module includes: a first output capacitor;

[0010] One end of the first output capacitor is used to connect to the input voltage. One end of the first output capacitor is also connected to the input end of the first reverse connection prevention module, and the other end of the first output capacitor is grounded.

[0011] As a possible implementation, the spike suppression module, the common mode inductor, and the filtering module form an electromagnetic interference filter;

[0012] The spike suppression module includes: a first voltage buffer unit and a second voltage buffer unit;

[0013] The filtering module includes: a first filtering unit and a second filtering unit;

[0014] One end of the first voltage buffer unit is respectively connected to the output end of the first reverse connection prevention module and one end of the first filtering unit. One end of the first filtering unit is also connected to the first input end of the common mode inductor, and the other end of the first filtering unit is respectively connected to the other end of the first voltage buffer unit and the second input end of the common mode inductor;

[0015] One end of the second voltage buffer unit is respectively connected to the first output end of the common mode inductor and one end of the second filtering unit, and the other end of the second voltage buffer unit is respectively connected to the other end of the second filtering unit and the second output end of the common mode inductor.

[0016] As a possible implementation, the first voltage buffer unit includes: a first capacitor and a first resistor; the second voltage buffer unit includes: a second capacitor;

[0017] One end of the first capacitor is respectively connected to the output end of the first reverse connection prevention module and one end of the first filtering unit. The other end of the first capacitor is connected to one end of the first resistor, and the other end of the first resistor is connected to the other end of the first filtering unit;

[0018] One end of the second capacitor is respectively connected to the first output end of the common mode inductor and one end of the second filtering unit, and the other end of the second capacitor is respectively connected to the second output end of the common mode inductor and the other end of the second filtering unit.

[0019] As a possible implementation, the first voltage buffer unit includes: a first capacitor; the second voltage buffer unit includes: a second capacitor and a second resistor;

[0020] One end of the first capacitor is respectively connected to the output end of the first reverse connection prevention module and one end of the first filtering unit, and the other end of the first capacitor is connected to the other end of the first filtering unit;

[0021] One end of the second capacitor is connected to the first output terminal of the common-mode inductor and one end of the second filtering unit respectively. The other end of the second capacitor is connected to one end of the second resistor. The other end of the second resistor is connected to the second output terminal of the common-mode inductor and the other end of the second filtering unit respectively.

[0022] As a possible implementation, the first voltage buffer unit includes: a first capacitor and a first resistor; the second voltage buffer unit includes: a second capacitor and a second resistor;

[0023] One end of the first capacitor is connected to the output terminal of the first reverse connection prevention module and one end of the first filtering unit respectively. The other end of the first capacitor is connected to one end of the first resistor. The other end of the first resistor is connected to the other end of the first filtering unit.

[0024] One end of the second capacitor is connected to the first output terminal of the common-mode inductor and one end of the second filtering unit respectively. The other end of the second capacitor is connected to one end of the second resistor. The other end of the second resistor is connected to the second output terminal of the common-mode inductor and the other end of the second filtering unit respectively.

[0025] As a possible implementation, the first filtering unit includes: a third capacitor and a fourth capacitor; the second filtering unit includes: a fifth capacitor and a sixth capacitor;

[0026] One end of the third capacitor is connected to one end of the first voltage buffer unit and the first input terminal of the common-mode inductor respectively. The other end of the third capacitor is connected to one end of the fourth capacitor. The other end of the fourth capacitor is connected to the other end of the first voltage buffer unit and the second input terminal of the common-mode inductor respectively.

[0027] One end of the fifth capacitor is connected to one end of the second voltage buffer unit. The other end of the fifth capacitor is connected to one end of the sixth capacitor. The other end of the sixth capacitor is connected to the other end of the second voltage buffer unit.

[0028] As a possible implementation, the DC output module further includes: a second output capacitor, a second reverse connection prevention module, a first switch and a second switch;

[0029] The other end of the first output capacitor is connected to the input terminal of the first switch and the input terminal of the second switch respectively. The output terminal of the first switch is connected to one end of the second output capacitor and the input terminal of the second reverse connection prevention module respectively. The output terminal of the second reverse connection prevention module is connected to the output terminal of the first reverse connection prevention module. The other end of the second output capacitor and the output terminal of the second switch are both grounded.

[0030] In the second aspect of the embodiments of the present application, a charging module is provided. The charging module includes the spike suppression circuit described in the first aspect above. The spike suppression circuit is used to absorb and suppress the transient spike voltage in the charging module.

[0031] In the third aspect of the embodiments of the present application, a charging system is provided. The charging system includes: the charging module described in the second aspect above, a third switch, and a fourth switch;

[0032] The input end of the third switch and the input end of the fourth switch are both connected to the output end of the charging module. The output end of the third switch and the output end of the fourth switch are both connected to the input end of the target charging object. The third switch and the fourth switch are used to control the charging conduction and disconnection between the charging module and the target charging object.

[0033] The beneficial effects of the embodiments of the present application include:

[0034] A spike suppression circuit provided by the embodiments of the present application accesses the input voltage through the first end of the DC output module, inputs the charging voltage into the spike suppression module via the first reverse connection prevention module. The spike suppression module includes a plurality of capacitors and at least one resistor. The port capacitor and at least one resistor in the spike suppression module form a damping absorption network with the parasitic inductance of the transmission cable, absorb the transient spike voltage output from the output end of the first reverse connection prevention module via the damping absorption network, and perform noise reduction on the charging voltage via the filtering circuit. In this way, the transient spike voltage of the reverse connection prevention diode in the charging circuit can be effectively suppressed. Thus, the effect of spike suppression in the charging power supply can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0036] Figure 1 It is a working principle diagram of a port of an existing charging system provided by the embodiments of the present application;

[0037] Figure 2 It is a working principle diagram of a first existing spike suppression circuit provided by the embodiments of the present application;

[0038] Figure 3 It is a working principle diagram of a second existing spike suppression circuit provided by the embodiments of the present application;

[0039] Figure 4 It is a structural schematic diagram of a first spike suppression circuit provided by the embodiments of the present application;

[0040] Figure 5 It is a working principle diagram of a first spike suppression circuit provided by the embodiments of the present application;

[0041] Figure 6 The equivalent circuit diagram of a spike suppression module provided by an embodiment of the present application;

[0042] Figure 7 The waveform diagram of underdamping or increased overdamping and spike voltage provided by an embodiment of the present application;

[0043] Figure 8 The working principle diagram of the second spike suppression circuit provided by an embodiment of the present application;

[0044] Figure 9 The working principle diagram of the third spike suppression circuit provided by an embodiment of the present application;

[0045] Figure 10 The working principle diagram of the fourth spike suppression circuit provided by an embodiment of the present application;

[0046] Figure 11 The structural schematic diagram of the charging system provided by an embodiment of the present application;

[0047] Figure 12 The working principle diagram of the fifth spike suppression circuit provided by an embodiment of the present application;

[0048] Figure 13 The working principle diagram of the sixth spike suppression circuit provided by an embodiment of the present application.

[0049] Description of the drawings: 100: DC output module; 101: First output capacitor; 102: Second output capacitor; 103: Second reverse connection prevention module; 104: First switch; 105: Second switch; 200: First reverse connection prevention module; 300: Electromagnetic interference filter; 301: Spike suppression module; 3011: First voltage buffer unit; 30111: First capacitor; 30112: First resistor; 3012: Second voltage buffer unit; 30121: Second capacitor; 30122: Second resistor; 302: Common mode inductor; 3031: First filtering unit; 30311: Third capacitor; 30312: Fourth capacitor; 3032: Second filtering unit; 30321: Fifth capacitor; 30322: Sixth capacitor; 401: Third switch; 402: Fourth switch. Detailed implementation manners

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. The components of the embodiments of the present application usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0051] Accordingly, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0052] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0053] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0054] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.

[0055] In the description of the present application, it should also be noted that unless otherwise clearly defined and limited, the terms "set", "installed", "connected", "connected to" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0056] Figure 1 A schematic structural diagram of a conventional charging system port provided for the present application is shown in Figure 1, in the existing charging system provided by the present application, filtering circuits are added to both the input port and the output port to meet the charging standards and provide a good charging battery environment. The charging power supply port is connected to the battery terminal via a cable. Under the condition of high-power operation, the cable has non-negligible lead parasitic inductance. The charging and disconnection of the battery are controlled by a switching module. However, the switching module will jitter during the switching process, which may cause resonance between the common-mode inductance in the cable and the filtering circuit at the charging system port, resulting in a large voltage spike across the reverse connection protection diode. If the generated voltage spike exceeds the device withstand voltage value of the reverse connection protection diode, the reverse connection protection function of the reverse connection protection diode will fail.

[0057] It should be noted that when there is a long cable in the charging system, resonance occurs between the parasitic inductance of the cable and the port capacitance of the charging system, resulting in a large stress on the reverse connection protection diode.

[0058] Figure 2 This is the working principle diagram of the first existing spike suppression circuit provided by the present application. Refer to Figure 2 , in the first existing spike suppression circuit provided by the present application, an RC circuit is connected in parallel across the reverse connection protection diode. The RC circuit is used to buffer and absorb the spike voltage across the reverse connection protection diode to eliminate the influence of the spike voltage on the reverse connection protection diode. However, this method is applicable to charging circuits with relatively small lead parasitic inductance and relatively small spike voltage generated across the reverse connection protection diode, and is not applicable to charging circuits with long cables. It is difficult to effectively suppress the spike voltage generated by the resonance between the parasitic inductance of the long cable and the port capacitance of the charging module.

[0059] Figure 3 This is the working principle diagram of the second existing spike suppression circuit provided by the present application. Refer to Figure 3 , in the second existing spike suppression circuit provided by the present application, a clamping circuit is used to absorb the spike voltage across the reverse connection protection diode to eliminate the influence of the spike voltage on the reverse connection protection diode. However, the clamping voltage in the clamping circuit has a large fluctuation range, and it is difficult to control the range of the clamping circuit to absorb the spike voltage, resulting in poor spike suppression effect.

[0060] The spike suppression circuit provided by the embodiments of the present application will be explained in detail below with reference to the accompanying drawings.

[0061] Figure 4 This is the structural schematic diagram of a spike suppression circuit provided by the present application. Refer to Figure 1 , the spike suppression circuit provided by the embodiments of the present application includes: a DC output module 100, a first reverse connection protection module 200, and a spike suppression module 301.

[0062] The first terminal of the DC output module 100 is connected to the input voltage, and the first terminal of the DC output module 100 is also connected to the input terminal of the first reverse connection prevention module 200. The second terminal of the DC output module 100 is grounded.

[0063] Optionally, the first terminal of the DC output module 100 is connected to the input voltage. The input voltage can be provided by a charging power supply or a charging pile. The DC output module 100 performs charging and energy storage based on the connected input voltage. The second terminal of the DC output module 100 is grounded to discharge excess charging charges.

[0064] Optionally, the first terminal of the DC output module 100 is also connected to the input terminal of the first reverse connection prevention module 200. The first terminal of the DC output module 100 can be used as both a charging input terminal and a discharging output terminal. The DC output module 100 transmits electric energy to the first reverse connection prevention module 200 via the first terminal.

[0065] The output terminal of the first reverse connection prevention module 200 is connected to the first terminal of the spike suppression module 301, and the second terminal of the spike suppression module 301 is grounded; the spike suppression module 301 includes multiple capacitors and at least one resistor, and the spike suppression module 301 is used to absorb and suppress the transient spike voltage of the output signal of the first reverse connection prevention module 200.

[0066] Optionally, the output terminal of the first reverse connection prevention module 200 is connected to the first terminal of the spike suppression module 301, and the second terminal of the spike suppression module 301 is grounded to form a closed loop with balanced charge quantity in the charging circuit. The spike suppression module 301 absorbs the spike voltage of the first reverse connection prevention module 200 via the first terminal.

[0067] Optionally, the spike suppression module 301 includes multiple capacitors and at least one resistor. The multiple port capacitors and at least one resistor in the spike suppression module 301 form an LCR damping network with the parasitic inductance of the cable, and the transient spike voltage of the first reverse connection prevention module 200 is absorbed via the LCR damping network.

[0068] In the embodiment of the present application, the input voltage is connected through the first terminal of the DC output module, and the charging voltage is input into the spike suppression module via the first reverse connection prevention module. The spike suppression module includes multiple capacitors and at least one resistor. The port capacitors and at least one resistor in the spike suppression module form a damping absorption network with the parasitic inductance of the transmission cable, and the transient spike voltage output from the output terminal of the first reverse connection prevention module is absorbed via the damping absorption network, and the charging voltage is denoised via the filtering circuit in the spike suppression module. In this way, the transient spike voltage of the reverse connection prevention diode in the charging circuit can be effectively suppressed. Thus, the effect of spike suppression in the charging power supply can be improved.

[0069] As an optional implementation manner, refer toFigure 5 The DC output module 100 provided by an embodiment of the present application includes: a first output capacitor 101. One end of the first output capacitor 101 is used to access an input voltage, and one end of the first output capacitor 101 is also connected to the input end of the first reverse connection prevention module 200. The other end of the first output capacitor 101 is grounded.

[0070] Optionally, the first output capacitor 101 is charged and stores energy under the action of the input voltage, and discharges the excess charging charge in the first output capacitor 101 through the grounding end.

[0071] As an alternative implementation, see Figure 5 The electromagnetic interference filter 300 provided by an embodiment of the present application includes: a spike suppression module 301, a common mode inductor 302, and a filtering module.

[0072] Optionally, the electromagnetic interference filter 300 is also called an EMI filter, which is mainly used to suppress the electromagnetic interference of the charging module and reduce the noise of the signal transmission on the power line.

[0073] The spike suppression module 301 includes: a first voltage buffer unit 3011 and a second voltage buffer unit 3012.

[0074] Optionally, both the first voltage buffer unit 3011 and the second voltage buffer unit 3012 can be used to absorb the transient spike voltage at the output port of the first reverse connection prevention module 200. The common mode inductor 302 is generated by the transmission cable in the charging circuit.

[0075] Optionally, the common mode inductor 302 is used to enhance the filtering effect of the electromagnetic interference filter 300. The common mode inductor 302 is composed of two sets of coils. The common mode inductor 302 cooperates with the filtering module to suppress the common mode interference in the circuit. It should be noted that one set of coils of the common mode inductor 302 is connected in series on the live wire, and the other set of coils is connected in series on the neutral wire, which can effectively prevent the charging influence of the switching power supply on the device to be charged.

[0076] The filtering module includes: a first filtering unit 3031 and a second filtering unit 3032.

[0077] One end of the first voltage buffer unit 3011 is respectively connected to the output end of the first reverse connection prevention module 200 and one end of the first filtering unit 3031. One end of the first filtering unit 3031 is also connected to the first input end of the common mode inductor 302. The other end of the first filtering unit 3031 is respectively connected to the other end of the first voltage buffer unit 3011 and the second input end of the common mode inductor 302.

[0078] Optionally, the first filtering unit 3031 filters out the voltage ripple in the electrical signal output by the first voltage buffering unit 3011, and transmits the electrical signal after noise reduction processing to the input end of the common mode inductor 302 through a cable.

[0079] One end of the second voltage buffering unit 3012 is respectively connected to the first output end of the common mode inductor 302 and one end of the second filtering unit 3032, and the other end of the second voltage buffering unit 3012 is respectively connected to the other end of the second filtering unit 3032 and the second output end of the common mode inductor 302.

[0080] Optionally, the second filtering unit 3032 filters out the voltage ripple in the electrical signal output by the second voltage buffering unit 3012, and transmits the electrical signal after noise reduction processing to the charging output port through a cable.

[0081] Figure 5 For the working principle diagram of the first spike suppression circuit provided by this application, see Figure 5 In the first spike suppression circuit provided by this application, the first voltage buffering unit 3011 of the spike suppression module 301 includes: a first capacitor 30111 and a first resistor 30112; the second voltage buffering unit 3012 of the spike suppression module 301 includes: a second capacitor 30121.

[0082] Optionally, the first voltage buffering unit 3011 is composed of a first capacitor 30111 and a first resistor 30112. The first capacitor 30111 serves as the port capacitor at the input end in the charging circuit, and the first resistor 30112 can be used to absorb the spike energy of the reverse connection prevention module. The second capacitor 30121 in the second voltage buffering unit 3012 serves as the port capacitor at the output end in the charging circuit. Both the first capacitor 30111 and the second capacitor 30121 are regarded as the port capacitors of the charging circuit, simply referred to as X capacitors.

[0083] It should be noted that the X capacitor is a safety capacitor. The X capacitor is generally a film capacitor. The X capacitor is connected across the live wire and the neutral wire to eliminate the common mode interference between the live wire and the neutral wire.

[0084] One end of the first capacitor 30111 is respectively connected to the output end of the first reverse connection prevention module 200 and one end of the first filtering unit 3031, the other end of the first capacitor 30111 is connected to one end of the first resistor 30112, and the other end of the first resistor 30112 is connected to the other end of the first filtering unit 3031.

[0085] Optionally, one end of the first capacitor 30111 is connected to the output end of the first reverse connection prevention module 200. The first capacitor 30111 filters the output electrical signal of the first reverse connection prevention module 200. The first resistor 30112 is used to absorb the spike energy in the output electrical signal of the first reverse connection prevention module 200. The first voltage buffer unit 3011 composed of the first capacitor 30111 and the first resistor 30112 performs noise reduction processing on the charging voltage after the spike voltage is absorbed through the first filtering unit 3031.

[0086] One end of the second capacitor 30121 is respectively connected to the first output end of the common mode inductor 302 and one end of the second filtering unit 3032. The other end of the second capacitor 30121 is respectively connected to the second output end of the common mode inductor 302 and the other end of the second filtering unit 3032.

[0087] Optionally, one end of the second capacitor 30121 is connected to the first output end of the common mode inductor 302, and the other end of the second capacitor 30121 is connected to the second output end of the common mode inductor 302. The second capacitor 30121 filters the output electrical signal of the common mode inductor 302, and performs secondary filtering through the second filtering unit 3032, and transmits the filtered charging voltage through the cable.

[0088] Figure 6 The equivalent circuit diagram of a spike suppression module provided by this application is shown in Figure 6 , in the startup stage of the charging system, at least one resistor and multiple capacitors in the spike suppression module 301 are equivalently formed into a second-order LCR damping network with the parasitic inductance of the transmission cable.

[0089] Optionally, according to the characteristics of the second-order LCR damping network, it can be divided into over-damping, critical damping, under-damping and undamped states. When, the charging system operates in the over-damped state, When, the charging system operates in the critical damping state, When, the charging system operates in the under-damped state, and when R = 0, the charging system operates in the undamped state.

[0090] Optionally, in the charging system, the undamped state does not exist. According to the parameters of the equivalent inductance and port capacitance of the charging system, it can be determined that the charging system is in the under-damped state. The inductance of the connecting cable in the charging system is generally above a few μH. Based on the discharge time requirement of the charging system for the power module port, the capacitance value of the port capacitance is generally not large. Thus, it is determined that the charging system is mostly in the critical or over-damped state, and the resistance value of the resistor used to absorb the spike voltage is generally above a few Ω.

[0091] Optionally, when the charging circuit is in an underdamped state and the first switch module is closed, the charging circuit can be equivalent to the zero-state response of a second-order LCR. The peak voltage generated on the capacitor in the peak suppression module 301 can be as high as nearly twice the battery voltage. At this time, the breakdown voltage of the anti-reverse diode needs to be greater than twice the battery voltage.

[0092] Figure 7 This is a waveform diagram of underdamping or increasing overdamping and peak voltage provided by this application. Refer to Figure 7 This is a waveform diagram showing the change in the peak voltage in the charging circuit when the charging circuit provided by this application is in an underdamped state and the overdamping of the charging circuit is increased.

[0093] In the embodiment of this application, the charging circuit is in an underdamped state so that the parasitic inductance of the connection cable in the charging circuit generates a peak voltage at the port capacitor. By adding a resistor at one end of the port capacitor, the voltage rise rate of the port capacitor can be effectively delayed, making the charging circuit in a critically damped or overdamped state, thereby suppressing the voltage peak. In this way, the effect of peak suppression in the charging power supply can be improved.

[0094] Figure 8 This is the working principle diagram of the second peak suppression circuit provided by this application. Refer to Figure 8 In the second peak suppression circuit provided by this application, the first voltage buffer unit 3011 of the peak suppression module 301 includes: a first capacitor 30111; the second voltage buffer unit 3012 of the peak suppression module 301 includes: a second capacitor 30121 and a second resistor 30122.

[0095] One end of the first capacitor 30111 is respectively connected to the output end of the first anti-reverse connection module 200 and one end of the first filtering unit 3031, and the other end of the first capacitor 30111 is connected to the other end of the first filtering unit 3031.

[0096] Optionally, one end of the first capacitor 30111 is connected to the output end of the first anti-reverse connection module 200. The first capacitor 30111 filters the output electrical signal of the first anti-reverse connection module 200 and performs secondary filtering processing through the first filtering unit 3031 to eliminate the common-mode interference in the charging electrical signal.

[0097] One end of the second capacitor 30121 is respectively connected to the first output end of the common-mode inductor 302 and one end of the second filtering unit 3032. The other end of the second capacitor 30121 is connected to one end of the second resistor 30122, and the other end of the second resistor 30122 is respectively connected to the second output end of the common-mode inductor 302 and the other end of the second filtering unit 3032.

[0098] Optionally, one end of the second capacitor 30121 is connected to the first output terminal of the common-mode inductor 302. The second capacitor 30121 filters the output electrical signal of the first output terminal of the common-mode inductor 302. The second resistor 30122 is used to absorb the spike energy in the output electrical signal of the first output terminal of the common-mode inductor 302. The second voltage buffer unit 3012 composed of the second capacitor 30121 and the second resistor 30122 performs secondary filtering on the charging voltage after the spike voltage is absorbed through the second filtering unit 3032, and transmits the voltage signal after noise reduction processing through a cable.

[0099] Figure 9 is the working principle diagram of the third spike suppression circuit provided by this application. Refer to Figure 9 In the third spike suppression circuit provided by this application, the first voltage buffer unit 3011 of the spike suppression module 301 includes: a first capacitor 30111 and a first resistor 30112; the second voltage buffer unit 3012 of the spike suppression module 301 includes: a second capacitor 30121 and a second resistor 30122.

[0100] One end of the first capacitor 30111 is respectively connected to the output terminal of the first reverse connection prevention module 200 and one end of the first filtering unit 3031. The other end of the first capacitor 30111 is connected to one end of the first resistor 30112. The other end of the first resistor 30112 is connected to the other end of the first filtering unit 3031.

[0101] Optionally, one end of the first capacitor 30111 is connected to the output terminal of the first reverse connection prevention module 200. The first capacitor 30111 filters the output electrical signal of the first reverse connection prevention module 200. The first resistor 30112 is used to absorb the spike energy in the output electrical signal of the first reverse connection prevention module 200. The first voltage buffer unit 3011 composed of the first capacitor 30111 and the first resistor 30112 performs secondary filtering on the charging voltage after the spike voltage is absorbed through the first filtering unit 3031, eliminates common-mode interference, and transmits the charging signal after noise reduction processing through a cable.

[0102] One end of the second capacitor 30121 is respectively connected to the first output terminal of the common-mode inductor 302 and one end of the second filtering unit 3032. The other end of the second capacitor 30121 is connected to one end of the second resistor 30122. The other end of the second resistor 30122 is respectively connected to the second output terminal of the common-mode inductor 302 and the other end of the second filtering unit 3032.

[0103] Optionally, one end of the second capacitor 30121 is connected to the first output end of the common-mode inductor 302. The second capacitor 30121 filters the output electrical signal of the first output end of the common-mode inductor 302. The second resistor 30122 is used to absorb the peak energy in the output electrical signal of the first output end of the common-mode inductor 302. The second voltage buffer unit 3012 composed of the second capacitor 30121 and the second resistor 30122 performs secondary filtering on the charging voltage after the peak voltage is absorbed through the second filtering unit 3032 to eliminate common-mode interference, and transmits the noise-reduced charging signal through the cable.

[0104] As an alternative implementation, refer to Figure 10 , the first filtering unit 3031 includes: a third capacitor 30311 and a fourth capacitor 30312, and the second filtering unit 3032 includes: a fifth capacitor 30321 and a sixth capacitor 30322.

[0105] One end of the third capacitor 30311 is respectively connected to one end of the first voltage buffer unit 3011 and the first input end of the common-mode inductor 302. The other end of the third capacitor 30311 is connected to one end of the fourth capacitor 30312. The other end of the fourth capacitor 30312 is respectively connected to the other end of the first voltage buffer unit 3011 and the second input end of the common-mode inductor 302.

[0106] Optionally, the first filtering unit 3031 realizes charging voltage filtering through the third capacitor 30311 and the fourth capacitor 30312 connected in series. One end of the third capacitor 30311 is connected to one end of the first voltage buffer unit 3011 and the first input end of the common-mode inductor 302. The other end of the fourth capacitor 30312 is connected to the other end of the first voltage buffer unit 3011 and the second input end of the common-mode inductor 302. The third capacitor 30311 and the fourth capacitor 30312 filter out the white noise in the output electrical signal of the first voltage buffer unit 3011, and transmit the noise-reduced electrical signal through the cable.

[0107] One end of the fifth capacitor 30321 is connected to one end of the second voltage buffer unit 3012. The other end of the fifth capacitor 30321 is connected to one end of the sixth capacitor 30322. The other end of the sixth capacitor 30322 is connected to the other end of the second voltage buffer unit 3012.

[0108] Optionally, the second filtering unit 3032 implements charging voltage filtering through a fifth capacitor 30321 and a sixth capacitor 30322 connected in series. One end of the fifth capacitor 30321 is connected to one end of the second voltage buffer unit 3012, and the other end of the sixth capacitor 30322 is connected to the other end of the second voltage buffer unit 3012. The fifth capacitor 30321 and the sixth capacitor 30322 filter out white noise in the output electrical signal of the second voltage buffer unit 3012 and transmit the noise-reduced electrical signal through a cable.

[0109] Optionally, the series capacitor combinations in the first filtering unit 3031 and the second filtering unit 3032 are both Y capacitors, that is, the third capacitor 30311, the fourth capacitor 30312, the fifth capacitor 30321, and the sixth capacitor 30322 are all ceramic capacitors. One end of the first filtering unit 3031 is connected to the live wire, and the other end of the first filtering unit 3031 is connected to the neutral wire; one end of the second filtering unit 3032 is connected to the live wire, and the other end of the second filtering unit 3032 is connected to the ground wire; the combination of the first filtering unit 3031 and the second filtering unit 3032 is used to eliminate the common-mode noise in the circuit signal transmission and reduce the common-mode interference.

[0110] It is worth noting that the capacitance value of the Y capacitor is small and can be ignored.

[0111] Figure 10 For the working principle diagram of the fourth spike suppression circuit provided by this application, see Figure 10 The DC output module provided by the embodiment of this application further includes: a second output capacitor 102, a second reverse connection prevention module 103, a first switch 104, and a second switch 105.

[0112] The other end of the first output capacitor 101 is respectively connected to the input end of the first switch 104 and the input end of the second switch 105. The output end of the first switch 104 is respectively connected to one end of the second output capacitor 102 and the input end of the second reverse connection prevention module 103. The output end of the second reverse connection prevention module 103 is connected to the output end of the first reverse connection prevention module 200. The other end of the second output capacitor 102 and the output end of the second switch 105 are both grounded.

[0113] Optionally, the addition of the second output capacitor 102, the second reverse connection prevention module 103, the first switch 104, and the second switch 105 enables the DC output module 100 to have two outputs, making the charging application range of the spike suppression circuit wider. The second output of the DC output module 100 is implemented by the second output capacitor 102, the second reverse connection prevention module 103, the first switch 104, and the second switch 105. Among them, the second output capacitor 102 provides the second output electrical signal of the DC output module 100, the second reverse connection prevention module 103 is used to enhance the reverse connection prevention function of the charging circuit, and the first switch 104 and the second switch 105 are used to control the series and parallel connection of the first output capacitor 101 and the second output capacitor 102.

[0114] Optionally, the on / off of the first switch 104 is used to control the series connection of the first output capacitor 101 and the second output capacitor 102 and the input electrical signal of the second reverse connection prevention module 103. If the first switch 104 is turned on, the first output capacitor 101 and the second output capacitor 102 are connected in series, and the second reverse connection prevention module 103 is turned on.

[0115] Optionally, the on / off of the second switch 105 is used to control the parallel connection of the first output capacitor 101 and the second output capacitor 102 and the input electrical signal of the second input terminal of the spike suppression module 301. If the second switch 105 is turned on, the first output capacitor 101 and the second output capacitor 102 are connected in parallel.

[0116] As an optional implementation manner, the charging module provided in the embodiments of the present application includes the above-mentioned spike suppression circuit. The spike suppression circuit is used to absorb and suppress the transient spike voltage in the charging module. The specific implementation principle is the same as the above working principle, and details are not described herein again.

[0117] Figure 11 is a schematic structural diagram of a charging system provided by the present application. Refer to Figure 11 , the embodiments of the present application provide a charging system including a charging module, a third switch 401, and a fourth switch 402.

[0118] The input terminal of the third switch 401 and the input terminal of the fourth switch 402 are both connected to the output terminal of the charging module. The output terminal of the third switch 401 and the output terminal of the fourth switch 402 are both connected to the input terminal of the target charging object. The third switch 401 and the fourth switch 402 are used to control the charging conduction and disconnection between the charging module and the target charging object.

[0119] Optionally, the input end of the third switch 401 is connected to the first output end of the spike suppression module 301, the output end of the third switch 401 is connected to the positive input end of the target charging object, the third switch 401 is used to control the positive input electrical signal of the target charging object, and the third switch 401 inputs the electrical signal output from the first output end of the spike suppression module 301 into the target charging object.

[0120] It should be noted that the third switch 401 can be a switch relay or other switch controls, and the present application does not make specific limitations thereto.

[0121] Optionally, the input end of the fourth switch 402 is connected to the second output end of the spike suppression module 301, the output end of the fourth switch 402 is connected to the negative input end of the target charging object, the fourth switch 402 is used to control the negative input electrical signal of the target charging object, and the fourth switch 402 inputs the electrical signal output from the second output end of the spike suppression module 301 into the target charging object.

[0122] It should be noted that the fourth switch 402 can be a switch relay or other switch controls, and the present application does not make specific limitations thereto.

[0123] Figure 12 This is the working principle diagram of the fifth spike suppression circuit provided by the present application. Refer to Figure 12 , in the fifth spike suppression circuit provided by the present application, not only is a resistor connected to the other end of the output port capacitor, but also the internal components of the DC output module are increased, so that the DC output module can support two-way output, which can further improve the universality effect of the spike suppression circuit.

[0124] Figure 13 This is the working principle diagram of the sixth spike suppression circuit provided by the present application. Refer to Figure 13 , in the sixth spike suppression circuit provided by the present application, not only are resistors connected to the other ends of the capacitors at the two input ports respectively, but also the internal components of the DC output module 100 are increased, so that the DC output module 100 can support two-way output, which can further improve the universality effect of the spike suppression circuit.

[0125] The above are only the specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present application, and all should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0126] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various modifications and variations can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A spike suppression circuit, characterized in that, The spike suppression circuit includes: a DC output module, a first reverse connection prevention module, and a spike suppression module; The first end of the DC output module is connected to the input voltage, and the first end of the DC output module is also connected to the input end of the first reverse connection prevention module. The second end of the DC output module is grounded; The output end of the first reverse connection prevention module is connected to the first end of the spike suppression module, and the second end of the spike suppression module is grounded; The spike suppression module includes a plurality of capacitors and at least one resistor, and the spike suppression module is used to absorb and suppress the transient spike voltage of the output signal of the first reverse connection prevention module; The spike suppression module, the common mode inductor, and the filtering module form an electromagnetic interference filter; The spike suppression module includes: a first voltage buffer unit and a second voltage buffer unit; The filtering module includes: a first filtering unit and a second filtering unit; One end of the first voltage buffer unit is respectively connected to the output end of the first reverse connection prevention module and one end of the first filtering unit. One end of the first filtering unit is also connected to the first input end of the common mode inductor. The other end of the first filtering unit is respectively connected to the other end of the first voltage buffer unit and the second input end of the common mode inductor; One end of the second voltage buffer unit is respectively connected to the first output end of the common mode inductor and one end of the second filtering unit. The other end of the second voltage buffer unit is respectively connected to the other end of the second filtering unit and the second output end of the common mode inductor.

2. The spike suppression circuit according to claim 1, wherein The DC output module includes: a first output capacitor; One end of the first output capacitor is used to connect to the input voltage, and one end of the first output capacitor is also connected to the input end of the first reverse connection prevention module. The other end of the first output capacitor is grounded.

3. The spike suppression circuit according to claim 1, wherein The first voltage buffer unit includes: a first capacitor and a first resistor; The second voltage buffer unit includes: a second capacitor; One end of the first capacitor is respectively connected to the output end of the first reverse connection prevention module and one end of the first filtering unit. The other end of the first capacitor is connected to one end of the first resistor, and the other end of the first resistor is connected to the other end of the first filtering unit; One end of the second capacitor is respectively connected to the first output end of the common mode inductor and one end of the second filtering unit. The other end of the second capacitor is respectively connected to the second output end of the common mode inductor and the other end of the second filtering unit.

4. The peak suppression circuit according to claim 1, wherein The first voltage buffer unit includes: a first capacitor; The second voltage buffer unit includes: a second capacitor and a second resistor; One end of the first capacitor is respectively connected to the output end of the first reverse connection prevention module and one end of the first filtering unit. The other end of the first capacitor is connected to the other end of the first filtering unit; One end of the second capacitor is respectively connected to the first output end of the common-mode inductor and one end of the second filtering unit. The other end of the second capacitor is connected to one end of the second resistor. The other end of the second resistor is respectively connected to the second output end of the common-mode inductor and the other end of the second filtering unit.

5. The spike suppression circuit according to claim 1, characterized in that, The first voltage buffer unit includes: a first capacitor and a first resistor; the second voltage buffer unit includes: a second capacitor and a second resistor; One end of the first capacitor is respectively connected to the output end of the first reverse connection prevention module and one end of the first filtering unit. The other end of the first capacitor is connected to one end of the first resistor. The other end of the first resistor is connected to the other end of the first filtering unit; One end of the second capacitor is respectively connected to the first output end of the common-mode inductor and one end of the second filtering unit. The other end of the second capacitor is connected to one end of the second resistor. The other end of the second resistor is respectively connected to the second output end of the common-mode inductor and the other end of the second filtering unit.

6. The spike suppression circuit according to claim 1, wherein The first filtering unit includes: a third capacitor and a fourth capacitor; the second filtering unit includes: a fifth capacitor and a sixth capacitor; One end of the third capacitor is respectively connected to one end of the first voltage buffer unit and the first input end of the common-mode inductor. The other end of the third capacitor is connected to one end of the fourth capacitor. The other end of the fourth capacitor is respectively connected to the other end of the first voltage buffer unit and the second input end of the common-mode inductor; One end of the fifth capacitor is connected to one end of the second voltage buffer unit. The other end of the fifth capacitor is connected to one end of the sixth capacitor. The other end of the sixth capacitor is connected to the other end of the second voltage buffer unit.

7. The spike suppression circuit according to claim 2, characterized in that, The DC output module further includes: a second output capacitor, a second reverse connection prevention module, a first switch, and a second switch; The other end of the first output capacitor is respectively connected to the input end of the first switch and the input end of the second switch. The output end of the first switch is respectively connected to one end of the second output capacitor and the input end of the second reverse connection prevention module. The output end of the second reverse connection prevention module is connected to the output end of the first reverse connection prevention module. The other end of the second output capacitor and the output end of the second switch are both grounded.

8. A charging module, characterized in that, Comprising the spike suppression circuit according to any one of claims 1-7, the spike suppression circuit being used to absorb and suppress the transient spike voltage in the charging module.

9. A charging system, characterized in that, Comprising at least one charging module, a third switch, and a fourth switch according to claim 8; The input end of the third switch and the input end of the fourth switch are both connected to the output end of the charging module. The output end of the third switch and the output end of the fourth switch are both connected to the input end of the target charging object. The third switch and the fourth switch are used to control the charging conduction and disconnection between the charging module and the target charging object.

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