Safety protection circuit

Abstract

The utility model provides a safety protection circuit, which comprises a signal detection module, a control signal output module and a control module, and is characterized in that the input end of the detection module is connected to the two ends of a detection resistor in a loop to be detected, and the output end of the detection module is connected to the input end of the control signal output module; the output end of the control signal output module is connected to the control module. The circuit state of the to-be-detected loop is monitored through the detection resistor connected into the to-be-detected loop of the energy storage system, the safety of the whole energy storage system is improved, and subsequent circuits are prevented from being damaged.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a safety protection circuit. Background Art

[0002] From the perspective of electricity safety, the high voltage (such as the busbar) and individual paths in the energy storage system are connected to the corresponding subsequent circuit cascade products. Therefore, if current leakage occurs on the high voltage (such as the busbar) and individual paths of the energy storage system, the safe use of the subsequent circuit and cascade products cannot be guaranteed, resulting in great safety hazards. Utility Model Content

[0003] In view of this, the purpose of the present application is to at least provide a safety protection circuit, which monitors the circuit state of the circuit to be detected by connecting a detection resistor in the circuit to be detected of the energy storage system, thereby improving the safety of the entire energy storage system and avoiding damage to subsequent circuits.

[0004] This application mainly includes the following aspects:

[0005] In a first aspect, an embodiment of the present application provides a safety protection circuit, which includes a signal detection module, a control signal output module and a control module, wherein the input end of the detection module is connected to the two ends of the detection resistor in the circuit to be detected, the output end of the detection module is connected to the input end of the control signal output module; and the output end of the control signal output module is connected to the control module.

[0006] In one possible implementation, the signal detection module includes a first signal amplification module, a first reference power output module and a second signal amplification module, wherein the input end of the first signal amplification module is connected to the two ends of the detection resistor, the output end of the first signal amplification module is connected to the input end of the second signal amplification module, and the output end of the second signal amplification module is connected to the input end of the control signal output module; the input end of the first reference power output module is connected to the positive power supply, and the output end of the first reference power output module is connected to the reference power input end of the first signal amplification module.

[0007] In one possible implementation, the first signal amplification module includes a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor and an instrumentation amplifier, wherein one end of the first resistor is connected to one end of the detection resistor, the other end of the first resistor is respectively connected to one end of the first capacitor, one end of the second capacitor and a first connection end of the instrumentation amplifier, one end of the second resistor is connected to the other end of the detection resistor, the other end of the second resistor is respectively connected to one end of the third capacitor, the other end of the second capacitor and the fourth connection end of the instrumentation amplifier, the other end of the third capacitor and the other end of the first capacitor are grounded, and one end of the third resistor is connected to the first end of the instrumentation amplifier. The second connection terminal of the instrument amplifier, the other end of the third resistor is connected to the third connection terminal of the instrument amplifier; the fifth connection terminal of the instrument amplifier is respectively connected to one end of the fourth capacitor, one end of the fifth capacitor and the positive power supply, the other end of the fourth capacitor and the other end of the fifth capacitor are connected and grounded, the sixth connection terminal of the instrument amplifier is connected to the input end of the second signal amplification module as the output end of the first signal amplification module, the seventh connection terminal of the instrument amplifier is connected to the output end of the second reference power output module as the reference power input end of the first signal amplification module, the eighth connection terminal of the instrument amplifier is respectively connected to one end of the sixth capacitor, one end of the seventh capacitor and the negative power supply, the other end of the sixth capacitor and the other end of the seventh capacitor are connected and grounded.

[0008] In one possible implementation, the first reference power supply output module includes a fourth resistor, a fifth resistor, a sixth resistor and a first reference source chip, wherein one end of the fourth resistor is connected to a positive power supply, the other end of the fourth resistor is respectively connected to a seventh connection terminal of the instrumentation amplifier, one end of the fifth resistor and a first connection terminal of the first reference source chip, the other end of the fifth resistor is respectively connected to one end of the sixth resistor and a second connection terminal of the first reference source chip, and the other end of the sixth resistor and a third connection terminal of the first reference source chip are respectively grounded.

[0009] In one possible implementation, the second signal amplification module includes a seventh resistor, an eighth capacitor, a ninth capacitor, a tenth capacitor and an operational amplifier, wherein one end of the seventh resistor is connected to the sixth connection terminal of the instrumentation amplifier, the other end of the seventh resistor is respectively connected to one end of the eighth capacitor and the first input terminal of the operational amplifier, the second input terminal of the operational amplifier is connected to the output terminal of the operational amplifier, the positive power input terminal of the operational amplifier is respectively connected to the positive power supply, one end of the ninth capacitor and one end of the tenth capacitor, the other end of the ninth capacitor and the other end of the tenth capacitor are connected and grounded, and the negative power input terminal of the operational amplifier and the other end of the eighth capacitor are grounded.

[0010] In a possible implementation, the control signal output module includes a leakage current acquisition module, wherein an input end of the leakage current acquisition module is connected to an output end of the detection module, and an output end of the leakage current acquisition module is connected to the control module.

[0011] In one possible implementation, the leakage current acquisition module includes an eighth resistor and an eleventh capacitor, wherein one end of the eighth resistor is connected to the output end of the operational amplifier in the detection module, the other end of the eighth resistor is respectively connected to one end of the eleventh capacitor and the control module, and the other end of the eleventh capacitor is grounded.

[0012] In one possible implementation, the control signal output module further includes a first protection signal generating module, wherein an input end of the first protection signal generating module is connected to an output end of the detection module, and an output end of the first protection signal generating module is connected to the control module.

[0013] In one possible implementation, the first protection signal generating module includes a first switch control module, a second switch control module and a third switch control module, wherein the input end of the first switch control module is connected to the output end of the detection module and / or one end of the first resistor in the leakage current acquisition module, and the output end of the first switch control module is connected to the control module in sequence through the second switch control module and the third switch control module.

[0014] In a possible implementation, the first switch control module includes a ninth resistor, a tenth resistor, a first control switch, an eleventh resistor, a twelfth resistor and a twelfth capacitor, wherein one end of the ninth resistor is connected to the output end of the detection module and / or one end of the eighth resistor in the leakage current acquisition module, the other end of the ninth resistor is respectively connected to one end of the tenth resistor and the control end of the first control switch, the first connection end of the first control switch is respectively connected to one end of the eleventh resistor and one end of the twelfth resistor, the second connection end of the first control switch is connected to the positive power supply, the other end of the tenth resistor is connected to the other end of the eleventh resistor and then grounded, the other end of the twelfth resistor is respectively connected to one end of the twelfth capacitor and the input end of the second switch control module, and the other end of the twelfth capacitor is grounded.

[0015] In a possible implementation, the second control switch includes a thirteenth resistor, a fourteenth resistor, a fifteenth resistor and a second control switch, wherein one end of the thirteenth resistor is respectively connected to one end of the fourteenth resistor, one end of the second capacitor in the first control switch module, the third switch control module and the control end of the second control switch, the other end of the thirteenth resistor is grounded, and the other end of the fourteenth resistor is connected to the first connection end of the second control switch and then grounded; the second connection end of the second control switch is connected to one end of the fifteenth resistor, and the other end of the fifteenth resistor is connected to the third switch control module.

[0016] In one possible implementation, the third switch control module includes a sixteenth resistor, a seventeenth resistor, an eighteenth resistor and a third control switch, wherein one end of the sixteenth resistor is respectively connected to the other end of the fifteenth resistor in the second control switch, one end of the seventeenth resistor and the control end of the third control switch, the other end of the sixteenth resistor is respectively connected to the other end of the seventeenth resistor, the voltage source and the first connection end of the third control switch, the second connection end of the third control switch is respectively connected to one end of the eighteenth resistor and the control module, and the other end of the eighteenth resistor is connected to one end of the thirteenth resistor in the second switch control module.

[0017] In one possible implementation, the control signal output module also includes a second protection signal generating module, wherein the input end of the second protection signal generating module is connected to the output end of the detection module, and / or the input end of the first protection signal generating module, and / or the input end of the leakage current acquisition module, and the output end of the second protection signal generating module is connected to the control module.

[0018] In one possible implementation, the second protection signal generating module includes a comparator, a thirteenth capacitor, a fourteenth capacitor and a second reference voltage output module, wherein the first input terminal of the comparator serves as the input terminal of the second protection signal generating module, connected to the output terminal of the detection module, and / or the input terminal of the leakage current acquisition module, and / or the input terminal of the first protection signal generating module; the second input terminal of the comparator is connected to the output terminal of the second reference voltage output module, and the power supply terminal of the second reference voltage output module is connected to the positive power supply; the positive power supply input terminal of the comparator is respectively connected to the positive power supply, one end of the thirteenth capacitor and one end of the fourteenth capacitor, the other end of the thirteenth capacitor and the other end of the fourteenth capacitor are connected and grounded, the negative power supply input terminal of the comparator is grounded, and the output terminal of the comparator is connected to the control module.

[0019] In one possible implementation, the second reference voltage output module includes a nineteenth resistor, a twentieth resistor, a twenty-first resistor and a second reference source chip, wherein one end of the nineteenth resistor is respectively connected to the second input terminal of the comparator, one end of the twentieth resistor and the first connection terminal of the second reference source chip; the other end of the nineteenth resistor is connected to a power supply, the other end of the twentieth resistor is respectively connected to one end of the twenty-first resistor and the second connection terminal of the second reference source chip, and the third connection terminal of the second reference source chip and the other end of the twenty-first resistor are respectively grounded.

[0020] The embodiment of the present application provides a safety protection circuit, which includes a signal detection module, a control signal output module and a control module, wherein the input end of the detection module is connected to the two ends of the detection resistor in the circuit to be detected, the output end of the detection module is connected to the input end of the control signal output module; and the output end of the control signal output module is connected to the control module. The present application monitors the circuit state of the circuit to be detected by connecting the detection resistor in the circuit to be detected of the energy storage system, thereby improving the safety of the entire energy storage system and avoiding damage to subsequent circuits.

[0021] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 One of the structural schematic diagrams of a safety protection circuit provided in an embodiment of the present application is shown;

[0024] Figure 2 A second structural schematic diagram of a safety protection circuit provided in an embodiment of the present application is shown;

[0025] Figure 3 A third structural schematic diagram of a safety protection circuit provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0026] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of explanation and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn in real proportion. The flowchart used in this application shows the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowchart can be implemented out of sequence, and the steps without logical context can be reversed in order or implemented simultaneously. In addition, those skilled in the art, under the guidance of the content of the present application, can add one or more other operations to the flowchart, or remove one or more operations from the flowchart.

[0027] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0028] The high voltage (such as the busbar) and individual paths in the energy storage system are connected to the corresponding subsequent circuit cascade products. Therefore, if current leakage occurs on the high voltage (such as the busbar) and individual paths in the energy storage system, the safe use of the subsequent circuit and cascade products cannot be guaranteed, resulting in great safety hazards. The current energy storage system does not pay enough attention to the small signal detection on its circuit, the detection circuit is relatively simple, and the error is large.

[0029] Based on this, the embodiment of the present application provides a safety protection circuit, which monitors the circuit state of the circuit to be detected by connecting the detection resistor in the circuit to be detected of the energy storage system, thereby improving the safety of the entire energy storage system and avoiding damage to subsequent circuits, as follows:

[0030] See also Figure 1 , Figure 1 FIG. 1 shows one of the structural schematic diagrams of a safety protection circuit provided in an embodiment of the present application. Figure 1 As shown, the safety protection circuit provided in the embodiment of the present application includes a signal detection module 1, a control signal output module 2 and a control module 3, wherein the input end of the detection module 1 is connected to the two ends of the detection resistor Rsen in the circuit to be detected, the output end of the detection module 1 is connected to the input end of the control signal output module 2, and the output end of the control signal output module 2 is connected to the control module 3. In the present application, the control module 3 can be a controller or other control circuit that can be used to control the on-off control of the circuit to be detected.

[0031] In a preferred embodiment, the control signal output module includes at least one of the following items: a leakage current acquisition module, a first protection signal generation module, and a second protection signal generation module. Figure 2 , Figure 2 FIG2 shows a second structural diagram of a safety protection circuit provided by an embodiment of the present application. Figure 2 In the embodiment of the present invention, the control signal output module 2 includes a leakage current acquisition module 21 , a first protection signal generation module 22 and a second protection signal generation module 23 .

[0032] Preferably, the input end of the leakage current acquisition module 21, the input end of the first protection signal generation module 22, and the input end of the second protection signal generation module 23 are respectively connected to the output end of the detection module 1, and the output end of the leakage current acquisition module 21, the output end of the second protection signal generation module 22, and the output end of the second protection signal generation module 23 are respectively connected to the control module 3.

[0033] In a preferred embodiment, if Figure 2 As shown, the signal detection module 1 includes a first signal amplification module 11 , a first reference power output module 12 and a second signal amplification module 13 .

[0034] Preferably, the input end of the first signal amplification module 11 is connected to both ends of the detection resistor Rsen, the output end of the first signal amplification module 11 is connected to the input end of the second signal amplification module 13, the output end of the second signal amplification module 13 serves as the output end of the signal detection module 1, and is respectively connected to the input end of the leakage current acquisition module 21, the input end of the first protection signal generation module 22 and the input end of the second protection signal generation module 23, the input end of the first reference power supply output module 12 is connected to the positive power supply +V0, and the output end of the first reference power supply output module 12 is connected to the reference power supply input end of the first signal amplification module 11.

[0035] like Figure 2 As shown, the leakage current acquisition module 21 includes an eighth resistor R8 and an eleventh capacitor C11.

[0036] Preferably, one end of the eighth resistor R8 is connected to the output end of the second signal amplifying module 13, the other end of the eighth resistor R8 is respectively connected to one end of the eleventh capacitor C11 and the control module 3, and the other end of the eleventh capacitor C11 is grounded.

[0037] Preferably, Figure 2 As shown, the first protection signal generating module 22 includes a first switch control module 210 , a second switch control module 211 and a third switch control module 213 .

[0038] Preferably, the input end of the first switch control module 210 is connected to the output end of the second signal amplification module 13 as the input end of the first protection signal generating module 21, and the output end of the first switch control module 210 is connected to the control module 3 in sequence through the second switch control module 211 and the third switch control module 212.

[0039] Preferably, the second protection signal generating module 23 includes a comparison module 230 and a second reference voltage output module 231. Figure 2As shown, the first input end of the comparison module 230 is connected to the output end of the second signal amplification module 13 as the input end of the second protection signal generating module 23, the second input end of the comparison module 230 is connected to the output end of the second reference voltage output module 231, the output end of the comparison module 230 is connected to the control module 3, and the second reference voltage output module 231 is also connected to the positive power supply +V0.

[0040] See also Figure 3 , Figure 3 FIG3 shows a third structural diagram of a safety protection circuit provided by an embodiment of the present application. Figure 3 As shown, the first signal amplification module 11 includes a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7 and an instrumentation amplifier U1, the first reference power output module 12 includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a first reference source chip U2, and the second signal amplification module 13 includes a seventh resistor R7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10 and an operational amplifier U3.

[0041] like Figure 3 As shown, one end of the first resistor R1 is connected to one end of the detection resistor Rsen, the other end of the first resistor R1 is respectively connected to one end of the first capacitor C1, one end of the second capacitor C2 and the first connection end of the instrument amplifier U1, one end of the second resistor R2 is connected to the other end of the detection resistor Rsen, the other end of the second resistor R2 is respectively connected to one end of the third capacitor C3, the other end of the second capacitor C2 and the fourth connection end of the instrument amplifier U1, the other end of the third capacitor C3 and the other end of the first capacitor C1 are grounded, one end of the third resistor R3 is connected to the second connection end of the instrument amplifier U1, and the other end of the third resistor R3 is connected to the third connection end of the instrument amplifier U1.

[0042] The fifth connection terminal of the instrument amplifier U1 is respectively connected to one end of the fourth capacitor C4, one end of the fifth capacitor C5 and the positive power supply +V0, the other end of the fourth capacitor C4 and the other end of the fifth capacitor C5 are connected and grounded, the sixth connection terminal of the instrument amplifier U6 is connected to one end of the seventh resistor (as the input end of the second signal amplification module 13) as the output end of the first signal amplification module 11, the seventh connection terminal of the instrument amplifier U1 is respectively connected to the other end of the fourth resistor R4 as the power input end of the first signal amplification module 11, the eighth connection terminal of the instrument amplifier U1 is respectively connected to one end of the sixth capacitor C6, one end of the seventh capacitor C7 and the negative power supply -V0, the other end of the sixth capacitor C6 and the other end of the seventh capacitor C7 are connected and grounded.

[0043] One end of the fourth resistor R4 is connected to the positive power supply +V0. Figure 3 In the illustrated embodiment, the other end of the fourth resistor R4 is also respectively connected to one end of the fifth resistor R5 and the first connection end of the first reference source chip U2, the other end of the fifth resistor R5 is respectively connected to one end of the sixth resistor R6 and the second connection end of the first reference source chip U2, the other end of the sixth resistor R6 and the third connection end of the first reference source chip U2 are respectively grounded.

[0044] Preferably, the other end of the seventh resistor R7 is respectively connected to one end of the eighth capacitor C8 and the first input end of the operational amplifier U3, the second input end of the operational amplifier U3 is connected to the output end of the operational amplifier U3, the positive power input end of the operational amplifier U3 is respectively connected to the positive power supply +V0, one end of the ninth capacitor C9 and one end of the tenth capacitor C10, the other end of the ninth capacitor C9 and the other end of the tenth capacitor C10 are connected and grounded, the negative power input end of the operational amplifier U3 and the other end of the eighth capacitor C8 are grounded, and the output end of the operational amplifier U3 is also connected to one end of the eighth resistor.

[0045] In a preferred embodiment, if Figure 3 As shown, the first switch control module includes a ninth resistor R9, a tenth resistor R10, a first control switch Q1, an eleventh resistor R11, a twelfth resistor R12 and a twelfth capacitor C12, the second switch control module includes a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15 and a second control switch Q2, and the third switch control module includes a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18 and a third control switch Q3.

[0046] Preferably, one end of the ninth resistor R9 serves as the input end of the first protection signal generating module and is connected to the output end of the operational amplifier U3, the other end of the ninth resistor R9 is respectively connected to one end of the tenth resistor R10 and the control end of the first control switch Q1, the first connection end of the first control switch Q1 is respectively connected to one end of the eleventh resistor R11 and one end of the twelfth resistor R12, the second connection end of the first control switch Q1 is connected to the positive power supply +V0, the other end of the tenth resistor R10 is connected to the other end of the eleventh resistor R11 and then grounded, the other end of the twelfth resistor R12 is respectively connected to one end of the twelfth capacitor C12 and one end of the thirteenth resistor R13 (serving as the input end of the second switch control module), and the other end of the twelfth capacitor C12 is grounded.

[0047] One end of the thirteenth resistor R13 is also connected to one end of the fourteenth resistor R14, the control end of the second control switch Q2 and the other end of the eighteenth resistor R18, the other end of the thirteenth resistor R13 is grounded, the other end of the fourteenth resistor R14 is connected to the first connection end of the second control switch Q2 and then grounded, the second connection end of the second control switch Q2 is connected to one end of the fifteenth resistor R15, and the other end of the fifteenth resistor R15 is connected to one end of the sixteenth resistor R16.

[0048] One end of the sixteenth resistor R16 is also connected to one end of the seventeenth resistor R17 and the control end of the third control switch Q3, the other end of the sixteenth resistor R16 is respectively connected to the other end of the seventeenth resistor R17, the voltage source VL+ and the first connection end of the third control switch Q3, the second connection end of the third control switch Q3 is respectively connected to one end of the eighteenth resistor R18 and the control module 3, and the other end of the eighteenth resistor R18 is also connected to one end of the thirteenth resistor R13.

[0049] Preferably, Figure 3 As shown, the comparison module 230 includes a comparator U4, a thirteenth capacitor C13 and a fourteenth capacitor C14, and the second reference voltage output module 231 includes a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21 and a second reference source chip U5.

[0050] Among them, the first input end of the comparator U4 is connected to the output end of the operational amplifier U3, the second input end of the comparator U4 is connected to one end of the nineteenth resistor, the positive power input end of the comparator is respectively connected to the positive power supply +V0, one end of the thirteenth capacitor C13 and one end of the fourteenth capacitor C14, the other end of the thirteenth capacitor C13 and the other end of the fourteenth capacitor C14 are connected and grounded, the negative power input end of the comparator U4 is grounded, and the output end of the comparator U4 is connected to the control module 3.

[0051] One end of the nineteenth resistor R19 is also connected to one end of the twentieth resistor R20 and the first connection end of the second reference source chip U5, respectively; the other end of the nineteenth resistor R19 is connected to the positive power supply +V0; the other end of the twentieth resistor R20 is connected to one end of the twenty-first resistor R21 and the second connection end of the second reference source chip U5, respectively; the third connection end of the second reference source chip U5 and the other end of the twenty-first resistor R21 are grounded, respectively.

[0052] In the present application, at least one of the signal detection module, the leakage current acquisition module, the first protection signal generation module, and the second protection signal generation module can be used to form the safety protection circuit provided in the present application.

[0053] The safety protection circuit provided in this application has the following working process:

[0054] For the signal detection module 1: the detection resistor Rsen is the resistor on the detection loop (selected according to the actual circuit), the voltage at one end of the detection resistor Rsen is recorded as V0, and the voltage at the other end of Rsen is recorded as V1. The first resistor R1, the first capacitor C1, the second resistor R2, the second capacitor C2 and the third capacitor C3 form a filter circuit on the signal input side of the instrument amplifier U1, which is used to filter out the differential mode and common mode interference between V0 and V1. In this application, the power supply of the instrument amplifier U1 adopts dual power rails +V0 and -V0, the fourth capacitor C4 and the fifth capacitor C5 are filter capacitors for the positive power supply +V0, the sixth capacitor C6 and the seventh capacitor C7 are filter capacitors for the negative power supply -V0, the third resistor R3 is the gain selection resistor of the instrument amplifier U1, and the gain of the instrument amplifier U1 is recorded as G0.

[0055] V3 is the output of the instrumentation amplifier U1, Vref1 is the reference voltage provided to the instrumentation amplifier U1 by the first reference voltage input module, Vref1 is the output of the first reference source chip U2, in the first reference voltage input module, the fourth resistor R4 needs to satisfy the cathode current of the first reference source chip U2 ≥ 1mA, the fifth resistor R5 and the sixth resistor R6 are used to adjust the value of Vref1, wherein Vref1 = 2.5×(1+R5 / R6), then V3 = G0×(V2-V1)+Vref1 = G0×(V2-V1)+2.5×(1+R5 / R6).

[0056] V3 is followed by operational amplifier U3 and then outputs V4, then V4=V3=G0×(V2-V1)+Vref1=G0×(V2-V1)+2.5×(1+R5 / R6), R7 and C8 form a filter circuit, and the follower circuit of operational amplifier U3 can increase the driving capability of V3 (the driving capability of V4 is greater than that of V3).

[0057] For the first protection signal generating module:

[0058] Assuming that the rated voltage of the detection resistor Rsen in the circuit to be detected is Vsen, and the conduction threshold corresponding to the first control switch is Vp, then at this time, if the voltage across the detection resistor Rsen is greater than Vsen, at this time, the first control switch Q1 is closed under the action of V4, and after the first control switch Q1 is closed, after passing through the twelfth resistor R12, the output signal is recorded as V5, and under the action of V5, the second control switch Q2 and the third control switch Q3 of the subsequent circuit are closed successively, and at this time, the S1 signal output at one end of the eighteenth resistor R18 indicates that the voltage across the detection resistor Rsen is in an abnormal state, and the control module 3 determines that there is a safety risk in the circuit to be detected after receiving the S1 signal, and the control module 3 can directly or indirectly cut off the circuit to be detected according to the received S1 signal, if the voltage across the detection resistor Rsen is less than or equal to Vsen, at this time, the first control switch Q1, the second control switch Q2 and the third control switch Q3 are disconnected successively, and at this time, the S1 signal indicates that the voltage across the detection resistor Rsen is in a normal state, and the control module 3 determines that there is no safety risk in the circuit to be detected after receiving the S1 signal.

[0059] For leakage current acquisition module:

[0060] After V4 is filtered by the eighth resistor R8 and the eleventh capacitor C11, the output current signal Vadc is sent to the ADC acquisition module in the control module. After being processed by the control module, the current IRsen flowing through the detection resistor Rsen can be calculated, wherein IRsen=V4 / Rsen=(G0×(V1-V0)+2.5×(1+R5 / R6)) / Rsen. After receiving IRsen, the control module can compare it with the rated current of the detection resistor Rsen to determine the leakage current in the circuit to be detected, and the corresponding post-processing can be performed according to the leakage current.

[0061] For the second protection signal generating module:

[0062] The second reference source chip U5 provides a reference voltage Vref2 for the comparator U4. The comparator U4 compares the two input signals V4 and Vref2. The nineteenth resistor R19 needs to satisfy the cathode current of the second reference source U5 ≥ 1mA. The twentieth resistor R20 and the twenty-first resistor R21 are used to adjust the value of Vref2, and Vref2 = 2.5×(1+R20 / R21). In this application, Vref2 is the rated voltage across the detection resistor Rsen.

[0063] The comparator U4 sends the comparison result of the output to the control module 3, so that the control module 3 makes a judgment on the protection of the energy storage system according to the received comparison signal. Furthermore, the output signal S2 corresponding to the comparator U4 indicates whether the circuit to be detected is in a safe working state. Specifically, when V4 is greater than Vref2, the comparator U4 outputs a high-level signal, indicating that the circuit to be detected is in an unsafe state. When V4 is less than or equal to Vref2, the comparator U4 outputs a low-level signal, indicating that the circuit to be detected is in a safe state.

[0064] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A safety protection circuit, characterized in that: The safety protection circuit includes a signal detection module, a control signal output module and a control module. Wherein, the input end of the detection module is connected to the two ends of the detection resistor in the circuit to be detected, and the output end of the detection module is connected to the input end of the control signal output module; The output end of the control signal output module is connected to the control module.

2. The safety protection circuit according to claim 1, characterized in that: The signal detection module includes a first signal amplification module, a first reference power output module and a second signal amplification module. Wherein, the input end of the first signal amplification module is connected to the two ends of the detection resistor, the output end of the first signal amplification module is connected to the input end of the second signal amplification module, and the output end of the second signal amplification module is connected to the input end of the control signal output module; The input end of the first reference power output module is connected to the positive power supply, and the output end of the first reference power output module is connected to the reference power input end of the first signal amplification module.

3. The safety protection circuit according to claim 2, characterized in that: The first signal amplification module includes a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor and an instrumentation amplifier. Wherein, one end of the first resistor is connected to one end of the detection resistor, the other end of the first resistor is respectively connected to one end of the first capacitor, one end of the second capacitor and the first connection end of the instrument amplifier, one end of the second resistor is connected to the other end of the detection resistor, the other end of the second resistor is respectively connected to one end of the third capacitor, the other end of the second capacitor and the fourth connection end of the instrument amplifier, the other end of the third capacitor and the other end of the first capacitor are grounded, one end of the third resistor is connected to the second connection end of the instrument amplifier, and the other end of the third resistor is connected to the third connection end of the instrument amplifier; The fifth connection terminal of the instrument amplifier is respectively connected to one end of the fourth capacitor, one end of the fifth capacitor and the positive power supply, the other end of the fourth capacitor and the other end of the fifth capacitor are connected and grounded, the sixth connection terminal of the instrument amplifier is connected to the input end of the second signal amplification module as the output end of the first signal amplification module, the seventh connection terminal of the instrument amplifier is connected to the output end of the first reference power output module as the reference power input end of the first signal amplification module, the eighth connection terminal of the instrument amplifier is respectively connected to one end of the sixth capacitor, one end of the seventh capacitor and the negative power supply, the other end of the sixth capacitor and the other end of the seventh capacitor are connected and grounded.

4. The safety protection circuit according to claim 3, characterized in that: The first reference power output module includes a fourth resistor, a fifth resistor, a sixth resistor and a first reference source chip. Among them, one end of the fourth resistor is connected to the positive power supply, the other end of the fourth resistor is respectively connected to the seventh connection terminal of the instrumentation amplifier, one end of the fifth resistor and the first connection terminal of the first reference source chip, the other end of the fifth resistor is respectively connected to one end of the sixth resistor and the second connection terminal of the first reference source chip, and the other end of the sixth resistor and the third connection terminal of the first reference source chip are respectively grounded.

5. The safety protection circuit according to claim 3, characterized in that: The second signal amplifying module includes a seventh resistor, an eighth capacitor, a ninth capacitor, a tenth capacitor and an operational amplifier. Among them, one end of the seventh resistor is connected to the sixth connection terminal of the instrumentation amplifier, the other end of the seventh resistor is respectively connected to one end of the eighth capacitor and the first input terminal of the operational amplifier, the second input terminal of the operational amplifier is connected to the output terminal of the operational amplifier, the positive power input terminal of the operational amplifier is respectively connected to the positive power supply, one end of the ninth capacitor and one end of the tenth capacitor, the other end of the ninth capacitor and the other end of the tenth capacitor are connected and grounded, and the negative power input terminal of the operational amplifier and the other end of the eighth capacitor are grounded.

6. The safety protection circuit according to claim 1, characterized in that: The control signal output module includes a leakage current acquisition module, Among them, the input end of the leakage current acquisition module is connected to the output end of the detection module, and the output end of the leakage current acquisition module is connected to the control module.

7. The safety protection circuit according to claim 6, characterized in that: The leakage current acquisition module includes an eighth resistor and an eleventh capacitor, Among them, one end of the eighth resistor is connected to the output end of the operational amplifier in the detection module, the other end of the eighth resistor is respectively connected to one end of the eleventh capacitor and the control module, and the other end of the eleventh capacitor is grounded.

8. The safety protection circuit according to claim 1 or 6, characterized in that: The control signal output module also includes a first protection signal generating module, The input end of the first protection signal generating module is connected to the output end of the detection module, and the output end of the first protection signal generating module is connected to the control module.

9. The safety protection circuit according to claim 8, characterized in that: The first protection signal generating module includes a first switch control module, a second switch control module and a third switch control module. Among them, the input end of the first switch control module is connected to the output end of the detection module and / or one end of the first resistor in the leakage current acquisition module, and the output end of the first switch control module is connected to the control module through the second switch control module and the third switch control module in sequence.

10. The safety protection circuit according to claim 9, characterized in that: The first switch control module includes a ninth resistor, a tenth resistor, a first control switch, an eleventh resistor, a twelfth resistor and a twelfth capacitor. Among them, one end of the ninth resistor is connected to the output end of the detection module and / or one end of the eighth resistor in the leakage current acquisition module, the other end of the ninth resistor is respectively connected to one end of the tenth resistor and the control end of the first control switch, the first connection end of the first control switch is respectively connected to one end of the eleventh resistor and one end of the twelfth resistor, the second connection end of the first control switch is connected to the positive power supply, the other end of the tenth resistor is connected to the other end of the eleventh resistor and then grounded, the other end of the twelfth resistor is respectively connected to one end of the twelfth capacitor and the input end of the second switch control module, and the other end of the twelfth capacitor is grounded.

11. The safety protection circuit according to claim 9, characterized in that: The second switch control module includes a thirteenth resistor, a fourteenth resistor, a fifteenth resistor and a second control switch. One end of the thirteenth resistor is respectively connected to one end of the fourteenth resistor, one end of the second capacitor in the first switch control module, the third switch control module and the control end of the second control switch, the other end of the thirteenth resistor is grounded, and the other end of the fourteenth resistor is connected to the first connection end of the second control switch and then grounded; The second connection end of the second control switch is connected to one end of the fifteenth resistor, and the other end of the fifteenth resistor is connected to the third switch control module.

12. The safety protection circuit according to claim 9, characterized in that: The third switch control module includes a sixteenth resistor, a seventeenth resistor, an eighteenth resistor and a third control switch, Among them, one end of the sixteenth resistor is respectively connected to the other end of the fifteenth resistor in the second switch control module, one end of the seventeenth resistor and the control end of the third control switch, the other end of the sixteenth resistor is respectively connected to the other end of the seventeenth resistor, the voltage source and the first connection end of the third control switch, the second connection end of the third control switch is respectively connected to one end of the eighteenth resistor and the control module, and the other end of the eighteenth resistor is connected to one end of the thirteenth resistor in the second switch control module.

13. The safety protection circuit according to claim 8, characterized in that: The control signal output module also includes a second protection signal generating module, Among them, the input end of the second protection signal generating module is connected to the output end of the detection module, and / or the input end of the first protection signal generating module, and / or the input end of the leakage current acquisition module, and the output end of the second protection signal generating module is connected to the control module.

14. The safety protection circuit according to claim 13, characterized in that: The second protection signal generating module includes a comparator, a thirteenth capacitor, a fourteenth capacitor and a second reference voltage output module. The first input end of the comparator is used as the input end of the second protection signal generating module, connected to the output end of the detection module, and / or the input end of the leakage current acquisition module, and / or the input end of the first protection signal generating module; The second input terminal of the comparator is connected to the output terminal of the second reference voltage output module, and the power supply terminal of the second reference voltage output module is connected to the positive power supply; The positive power input terminal of the comparator is respectively connected to the positive power supply, one end of the thirteenth capacitor and one end of the fourteenth capacitor, the other end of the thirteenth capacitor and the other end of the fourteenth capacitor are connected and grounded, the negative power input terminal of the comparator is grounded, and the output terminal of the comparator is connected to the control module.

15. The safety protection circuit according to claim 14, characterized in that: The second reference voltage output module includes a nineteenth resistor, a twentieth resistor, a twenty-first resistor and a second reference source chip. Wherein, one end of the nineteenth resistor is respectively connected to the second input end of the comparator, one end of the twentieth resistor and the first connection end of the second reference source chip; The other end of the nineteenth resistor is connected to the power supply, the other end of the twentieth resistor is respectively connected to one end of the twenty-first resistor and the second connection end of the second reference source chip, and the third connection end of the second reference source chip and the other end of the twenty-first resistor are respectively grounded.

Images