Circuit breaking trigger device

Abstract

The present application provides a circuit breaking trigger device, comprising a determination module configured to perform integral operation on a voltage on a shunt on a target circuit to obtain a corresponding integral voltage, and generate a trigger signal when the integral voltage reaches a first threshold, the trigger signal being configured to break the target circuit, wherein the time when the integral voltage reaches the first threshold is inversely proportional to the value of the voltage on the shunt.

Description

Circuit breaker trigger device

[0001] This application claims priority to Chinese patent applications filed with the China Patent Office on November 17, 2023, with application numbers 202323116842.7 and 202311540808.4. The entire contents of the above applications are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of battery protection, and in particular to a circuit breaker triggering device. Background Art

[0003] In the related art, a microcontroller unit (MCU) trigger detects the loop current and triggers the cutoff after a fixed process, that is, the low voltage and high voltage are both triggered to cut off after a fixed time. SUMMARY OF THE INVENTION

[0004] In high-voltage circuits, the current I is typically high. If the time it takes for a trigger to disconnect is defined as t, then the Joule integral I²t, which is applied to the electrical components in the high-voltage circuit before disconnection, increases exponentially with the current I. This causes the components to generate significant heat before the trigger disconnects the high-voltage circuit, which can easily damage the components and pose a significant risk. Therefore, the triggers in related art offer limited protection against high currents.

[0005] An embodiment of the present application provides a circuit breaker trigger device, comprising: a judgment module, which is configured to perform an integration operation on the voltage on the shunt to obtain a corresponding integrated voltage, and generate a trigger signal when the integrated voltage reaches a first threshold, and the trigger signal is configured to cause the target circuit to be disconnected; wherein the time when the integrated voltage reaches the first threshold is inversely proportional to the value of the voltage on the shunt. Beneficial effects

[0006] In an embodiment of the present application, a judgment module integrates the voltage on the shunt in the target circuit to obtain a corresponding integrated voltage, and compares the integrated voltage with a first threshold. When the integrated voltage reaches the first threshold voltage, a trigger signal is generated to disconnect the target circuit. Since the growth rate of the integrated voltage is set to be inversely proportional to the magnitude of the voltage on the shunt, the greater the voltage on the shunt, the shorter the time it takes for the integrated voltage to reach the first threshold voltage. In other words, the time it takes for the integrated voltage to reach the first threshold is set to be inversely proportional to the magnitude of the voltage on the shunt. In this way, the greater the current in the target circuit, the shorter the time it takes to disconnect the target circuit, that is, the shorter the disconnection time. This improves the related art, in which the disconnection time is fixed, and the trigger cannot be turned off in time under high current conditions. As a result, the Joule integral I²t borne by the target circuit during the disconnection process increases exponentially with the increase of current I, resulting in poor trigger protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] FIG1 is a module schematic diagram of a circuit breaker triggering device and its application scenario provided by an embodiment of the present application;

[0008] FIG2 is a schematic diagram of a module of a circuit breaker triggering device according to an embodiment of the present application;

[0009] FIG3 is a schematic diagram of a judgment module according to an embodiment of the present application;

[0010] FIG4 is a schematic structural diagram of an integration circuit provided in an embodiment of the present application;

[0011] FIG5 is a schematic structural diagram of a differential amplifier circuit provided in an embodiment of the present application;

[0012] FIG6 is a schematic diagram of the structure of an absolute value product circuit provided in an embodiment of the present application;

[0013] FIG7 is a schematic structural diagram of a threshold determination circuit provided in an embodiment of the present application;

[0014] FIG8 is a schematic structural diagram of a trigger judgment circuit provided in an embodiment of the present application;

[0015] FIG9 is a schematic structural diagram of a trigger module provided in an embodiment of the present application.

[0016] Description of reference numerals:

[0017] 100, circuit breaker trigger device; 110, judgment module; 111, differential amplifier circuit; 112, value product circuit; 113, threshold judgment circuit; 114, integration circuit; 115, trigger judgment circuit; 120, trigger module; 130, power supply module;

[0018] 200, battery pack;

[0019] 300. Load. Modes for Carrying Out the Invention

[0020] The safety of short circuit protection depends on the Value, where I is the current in the current, t is the time from sensing the current is too high to the protection device such as the trigger shutting down, The smaller the value, the less damage to the entire high-voltage circuit.

[0021] In the related art, a microcontroller unit (MCU) acts as a trigger to detect loop current and triggers disconnection after a fixed processing flow. Specifically, both low-voltage and high-voltage circuits are disconnected after a fixed time. Therefore, the disconnection time t remains constant, while the Joule integral I²t experienced by the circuit during disconnection increases exponentially with current I. This results in lower protection in these triggers at high currents.

[0022] For example, the MCU (Microcontroller Unit) is used to detect the current in the circuit. After the MCU's logic processing, the trigger is controlled to cut off when the current in the circuit reaches the threshold. Since the detection of the circuit current must be processed by the MCU's logic, and the MCU's logic operation time is fixed, the trigger cut-off time in this method is long and fixed. When in a high-voltage circuit, the large current in the circuit is large. During the cut-off process, the Joule integral I²t that the circuit bears increases exponentially with the increase of the current I, which eventually leads to the technical problem of damage to electrical devices. Traditional fuses are based on their physical properties. The value will vary with the current value, and will be larger when the current is small.

[0023] The embodiment of the present application provides a circuit breaker triggering device 100 to improve the technical problems existing in the related technical solutions.

[0024] As shown in Figures 1 to 9, the circuit breaker triggering device 100 includes a determination module 110, which is electrically connected to a shunt Shunt on the target circuit. Determination module 110 determines the voltage on the target circuit by sampling the voltage across the shunt Shunt. The shunt Shunt may be a resistor R of a specific resistance value. Determination module 110 integrates the voltage across the shunt Shunt to obtain a corresponding integrated voltage. Because the voltage across the shunt Shunt may change dynamically, this integration process can also be performed in real time.

[0025] The voltage across the shunt Shunt determines the magnitude of the integrated voltage within a given timeframe. That is, within a given timeframe, the higher the voltage across the shunt Shunt, the higher the corresponding integrated voltage. Therefore, the higher the voltage across the shunt Shunt, the shorter the time it takes for the integrated voltage to reach the first threshold. In other words, the time it takes for the integrated voltage to reach the first threshold is inversely proportional to the magnitude of the voltage across the shunt Shunt.

[0026] When the integrated voltage reaches the first threshold, the circuit breaker trigger device 100 generates a trigger signal, which can drive the protection device Pyrofuse in the target circuit to perform a protection action, such as disconnecting the target circuit.

[0027] The voltage on the shunt Shunt is U=IR, where I is the current flowing through the shunt Shunt and R is the resistance of the shunt Shunt. The Joule integral of the target circuit is I 2 t, where t is the time it takes for the circuit breaker triggering device 100 to sense the voltage on the shunt Shunt and trigger the protection device Pyrofuse to cut off the target circuit.

[0028] Based on the scheme of the circuit breaker trigger device 100 in this embodiment, the greater the voltage on the shunt Shunt, the shorter the time it takes for the integrated voltage generated by the judgment module 110 to reach the first threshold. When the value of the first threshold is set, the greater the voltage of the target circuit, that is, the greater the current (I=U / R), the shorter the time t it takes for the judgment module 110 to generate a trigger signal to trigger the protection device Pyrofuse to disconnect.

[0029] Based on the scheme of the circuit-breaking triggering device 100 in this embodiment, the Joule integral that the target circuit is expected to withstand during the circuit-breaking process can be used as the first threshold value. Then, the Joule integral that the target circuit withstands during the circuit-breaking process is a constant value. The time it takes to cut off the target circuit under a large current is less than the time it takes to cut off the target circuit under a small current. The Joule integral that the target circuit withstands when cutting off under a large current is the same as the Joule integral that it withstands under a small current. Therefore, the Joule integral that the target circuit withstands is I 2 t does not increase as the current on the shunt Shunt increases.

[0030] In this embodiment, the voltage on the shunt Shunt on the target circuit is integrated by the judgment module 110 to obtain a corresponding integrated voltage, and the target circuit is disconnected when the integrated voltage reaches a first threshold value, and the time for the integrated voltage to reach the first threshold value is set to be inversely proportional to the value of the voltage on the shunt Shunt, so that the greater the current on the target circuit, the shorter the time taken to disconnect the target circuit, thereby improving the technical problem in the related art that, due to the fixed disconnection time, the Joule integral I²t borne by the target circuit during the disconnection process increases exponentially with the increase of the current I, and the protection device has low protection under large current conditions.

[0031] As shown in FIG3 and FIG4 , in some embodiments, the determination module 110 includes an integration circuit 114. The integration circuit 114 is electrically connected to the shunt Shunt to receive the voltage across the shunt Shunt. The integration circuit 114 integrates the voltage across the shunt Shunt to obtain an integrated voltage.

[0032] Exemplarily, the integration circuit 114 includes a first operational amplifier U2, a first resistor R3, a second resistor R4, and a first capacitor C1. The inverting input terminal of the first operational amplifier U2 receives the voltage on the shunt Shunt through the first resistor R3, the non-inverting input terminal of the first operational amplifier U2 is electrically connected to the first power line through the second resistor R4, the output terminal of the first operational amplifier U2 is configured to output the integrated voltage, one terminal of the first capacitor C1 is electrically connected to the inverting input terminal of the first operational amplifier U2, and the other terminal of the first capacitor C1 is electrically connected to the output terminal of the first operational amplifier U2.

[0033] It can be understood that the first operational amplifier U2, the first resistor R3 and the second resistor R4 constitute an integration circuit 114. The magnitude of the voltage at the output end of the first operational amplifier U2 per unit time is determined by the voltage input into the inverting input end of the first operational amplifier U2. The greater the voltage at the inverting input end of the first operational amplifier U2, the greater the value of the voltage at the output end of the first operational amplifier U2 per unit time.

[0034] As shown in Figures 3, 5, and 6, in one embodiment, the judgment module 110 further includes an absolute value product circuit 112 and a differential amplifier circuit 111. The absolute value product circuit 112 is electrically connected between the differential amplifier circuit 111 and the first resistor R3. The absolute value product circuit 112 is configured to perform a product operation on the voltage on the differential amplifier circuit 111 to obtain a first operational voltage. The first operational amplifier U2 obtains an integrated voltage based on the first operational voltage.

[0035] The differential amplifier circuit 111 is electrically connected between the shunt Shunt and the absolute value product circuit 112 . The differential amplifier circuit 111 is configured to amplify the voltage on the shunt Shunt to obtain a second operating voltage, and output the second operating voltage to the absolute value product circuit 112 .

[0036] Exemplarily, the differential amplifier circuit 111 includes a fourth operational amplifier U5, an eighth resistor R10, a ninth resistor R11, and a tenth resistor R12, the non-inverting input terminal of the fourth operational amplifier U5 is electrically connected to one end of the shunt Shunt through the eighth resistor R10, the inverting input terminal of the fourth operational amplifier U5 is electrically connected to the other end of the shunt Shunt through the ninth resistor R11, wherein the inverting input terminal of the fourth operational amplifier U5 is electrically connected to the output terminal of the fourth operational amplifier U5 through the tenth resistor R12.

[0037] It is understandable that the fourth operational amplifier U5 can differentially amplify the voltage on the shunt Shunt to prevent the absolute value product circuit 112 from providing the result of the operation to the integration circuit 114 when the voltage on the shunt Shunt is too small.

[0038] The absolute value product circuit 112 includes a product module U6, the input end of the product module U6 is electrically connected to the output end of the fourth operational amplifier U5, and the output end of the product module U6 is electrically connected to the inverting input end of the first operational amplifier U2. The product module U6 performs a product operation on the second operational voltage to obtain the first operational voltage.

[0039] Exemplarily, the product module U6 can be implemented using a product chip, such as the product chip model MPY100 from Texas Instruments. The input terminal X1 of the product chip is electrically connected to the output terminal of the fourth operational amplifier U5, and the output terminal OUT of the product chip is electrically connected to the inverting input terminal of the first operational amplifier U2. The first voltage pin +vcc, the second voltage pin vos, and the third voltage pin -vcc of the product chip are grounded through resistors R13, R14, and R15, respectively.

[0040] It is understandable that other circuits with multiplication functions may also be used for implementation.

[0041] As shown in Figures 3, 4, and 7, in some embodiments, the integration circuit 114 further includes a first transistor D1, the input terminal of the first transistor D1 being electrically connected to the output terminal of the absolute value product circuit 112, and the output terminal of the first transistor D1 being electrically connected to the first resistor R3. The determination module 110 further includes a threshold determination circuit 113, the input terminal of the threshold determination circuit 113 being electrically connected to the output terminal of the absolute value product circuit 112, and the output terminal of the threshold determination circuit 113 being electrically connected to the control terminal of the first transistor D1. When the first operating voltage is greater than the second threshold, the threshold determination circuit 113 controls the first transistor D1 to conduct.

[0042] Exemplarily, the threshold determination circuit 113 includes a fifth operational amplifier U1, an eleventh resistor R1, and a twelfth resistor R2. One end of the eleventh resistor R1 is electrically connected to the second power line, the other end of the eleventh resistor R1 is electrically connected to one end of the twelfth resistor R2, and the other end of the twelfth resistor R2 is electrically connected to the first power line. The inverting input of the fifth operational amplifier U1 is electrically connected to the common end of the eleventh resistor R1 and the twelfth resistor R2, and the non-inverting input of the fifth operational amplifier U1 is electrically connected to the output end OUT of the product chip.

[0043] As can be understood, the fifth operational amplifier U1, the eleventh resistor R1, and the twelfth resistor R2 form a comparison circuit. The first operational voltage output by the product chip is compared with the voltage across the twelfth resistor R2. That is, the voltage across the twelfth resistor R2 is the second threshold. The second threshold can be adjusted by adjusting the resistance values ​​of the eleventh resistor R1 and the twelfth resistor R2.

[0044] When the first operational voltage output by the product chip is greater than the voltage on the twelfth resistor R2, the fifth operational amplifier U1 outputs a first control voltage, and the first control voltage turns on the first transistor D1. The first operational voltage output by the product chip is input to the inverting input terminal of the first operational amplifier U2, and the first operational amplifier U2 operates on the first operational voltage to obtain an integrated voltage.

[0045] As shown in FIG8 , in one embodiment, the judgment module 110 further includes a trigger judgment circuit 115 , which is electrically connected to the output terminal of the integration circuit 114 . When the integration voltage reaches a first threshold, the trigger judgment circuit 115 generates a trigger signal.

[0046] Exemplarily, the trigger judgment circuit 115 includes a second operational amplifier U3, a third operational amplifier U4, a third resistor R5, a fourth resistor R6, a fifth resistor R7, a sixth resistor R8, and a seventh resistor R9.

[0047] One end of the sixth resistor R8 is electrically connected to the second power line. The other end of the sixth resistor R8 is electrically connected to one end of the seventh resistor R9. The other end of the seventh resistor R9 is electrically connected to the first power line.

[0048] The inverting input terminal of the second operational amplifier U3 is electrically connected to the output terminal of the integration circuit 114 through the third resistor R5, the non-inverting input terminal of the second operational amplifier U3 is electrically connected to the first power line through the fourth resistor R6, and the inverting input terminal of the second operational amplifier U3 is electrically connected to the output terminal of the second operational amplifier U3 through the fifth resistor R7.

[0049] The non-inverting input terminal of the third operational amplifier U4 is electrically connected to the output terminal of the second operational amplifier U3, the inverting input terminal of the third operational amplifier U4 is electrically connected to the common terminal of the sixth resistor R8 and the seventh resistor R9, and the output terminal of the third operational amplifier U4 is configured to output a trigger signal.

[0050] It can be understood that the second operational amplifier U3, the third resistor R5, the fourth resistor R6 and the fifth resistor constitute an inverse proportional amplifier circuit. The second operator obtains a third operational voltage after inverse amplification of the integrated voltage and outputs it to the non-inverting input terminal of the third operational amplifier U4.

[0051] The third operational amplifier U4, the sixth resistor R8, and the seventh resistor R9 form a comparator. The third operational voltage is compared with the voltage across the seventh resistor R9, which is the first threshold. The first threshold can be adjusted by adjusting the resistance values ​​of the sixth resistor R8 and the seventh resistor R9. When the third operational voltage is greater than the first threshold, the third operational amplifier U4 outputs a trigger signal.

[0052] Based on the scheme of the circuit-breaking triggering device 100 in this embodiment, the Joule integral that the target circuit is expected to withstand during the circuit-breaking process can be used as the first threshold value. Then, the Joule integral that the target circuit withstands during the circuit-breaking process is a constant value. The time it takes to cut off the target circuit under a large current is less than the time it takes to cut off the target circuit under a small current. The Joule integral that the target circuit withstands when cutting off under a large current is the same as the Joule integral that it withstands under a small current. Therefore, the Joule integral that the target circuit withstands is I 2 t does not increase as the current on the shunt Shunt increases.

[0053] For example, referring to FIG. 3 to FIG. 9 , the differential amplifier circuit 111 amplifies the voltage U0 across the shunt Shunt and outputs the second operational voltage U 01=β* U0=β*I0*R0 (β: differential amplification factor) where β is the differential amplification factor of the fourth operational amplifier U5, I0 is the current flowing through the shunt Shunt, and R0 is the voltage on the shunt Shunt.

[0054] The absolute value product circuit 112 converts the second operation voltage U 01 After the product operation, the first operation voltage U is obtained 02 =U 01 ²= I0²*(β*R0)².

[0055] The threshold judgment circuit 113 converts the first operation voltage U 02 With the second threshold U a Compare. It can be understood that the first operating voltage U 02 With the second threshold U a The essence of the comparison is to compare the current I0 passing through the shunt Shunt with the current threshold I a (I a is compared with the current on the shunt Shunt corresponding to when the voltage on the shunt Shunt reaches the second threshold.

[0056] When the first operational voltage U 02 Greater than the second threshold U a When the threshold judgment circuit 113 outputs the control voltage U 03 The first transistor D1 is turned on, and the first operation voltage U 02 Input to the integration circuit 114. The integration circuit 114 converts U 02 The value is integrated and the output integral voltage U 04 = = To the trigger judgment circuit 115.

[0057] The second operational amplifier U3 in the trigger judgment circuit 115 integrates the voltage U 04 And reverse amplify to get the third operational voltage U b = , and the third operational voltage U b The third operational amplifier U4 converts the third operational voltage U b With the first threshold U c = For comparison, is the Joule integral of the target circuit during the breaking process. b Greater than the first threshold U c When the trigger signal U_test is output by the third operational amplifier U4, the protection device Pyrofuse is triggered to open the target circuit.

[0058] It can be understood that the third operating voltage U can be set b and the first threshold U c The coefficient part are equal, then the third operational voltage U b and the first threshold U c The comparison can be seen as and Therefore, the Joule integral of the target circuit during the breaking process can be calculated as The value of the first threshold is set so that when the first threshold is fixed, the circuit breaking triggering device 100 can ensure that the Joule integral borne by the target circuit during the circuit breaking process is the same when the current is large and when the current is low.

[0059] As shown in Figures 2 and 9, in one embodiment, the circuit breaker trigger device 100 further includes a trigger module 120. The trigger module 120 is electrically connected to the judgment module 110. The trigger module 120 is configured to drive a protection device Pyrofuse on the target circuit according to a trigger signal. When the protection device Pyrofuse is driven, the target circuit is disconnected.

[0060] Exemplarily, the trigger module 120 includes a second transistor Q1 , a third transistor Q3 , a thirteenth resistor R16 , a fourteenth resistor R17 , a fifteenth resistor R19 , and a sixteenth resistor R18 .

[0061] The control end of the second transistor Q1 is electrically connected to the output end of the determination module 110 , and the input end of the second transistor Q1 is electrically connected to the first power line.

[0062] The control end of the third transistor Q3 is electrically connected to the output end of the second transistor Q1, the input end of the third transistor Q3 is electrically connected to the third power line, the output end of the third transistor Q3 is electrically connected to the first control end of the protection device Pyrofuse, and the second control end of the protection device Pyrofuse is grounded through the second control end resistor R22.

[0063] When the second transistor Q1 is turned on, the voltage on the first power line pulls down the voltage of the control terminal of the third transistor Q3, turning on the third transistor Q3. The third transistor Q3 outputs the voltage on the third power line to the first control terminal of the protection device Pyrofuse, driving the protection device Pyrofuse to disconnect the target circuit.

[0064] It can be understood that a thirteenth resistor R16 can be set between the control end of the second transistor Q1 and the output end of the judgment module 110, and the control end of the second transistor Q1 is electrically connected to the first power line through the fourteenth resistor R17, which can prevent the voltage of the trigger signal from being too high to damage the second transistor Q1.

[0065] A fifteenth resistor R19 is provided between the control end of the third transistor Q3 and the output end of the second transistor Q1 . The control end of the third transistor Q3 is electrically connected to the third power line via a sixteenth resistor R18 .

[0066] In some embodiments, the trigger module 120 further includes a maintaining unit, and the maintaining unit includes a fourth transistor Q2 , a seventeenth resistor R21 , an eighteenth resistor R20 , and a nineteenth resistor R23 .

[0067] One end of the seventeenth resistor R21 is electrically connected to the output end of the third transistor Q3, the other end of the seventeenth resistor is electrically connected to the third power line, the control end of the fourth transistor Q2 is electrically connected to the output end of the third transistor Q3 through the eighteenth resistor R20, the input end of the fourth transistor Q2 is electrically connected to the first power line, and the output end of the fourth transistor Q2 is electrically connected to the control end of the third transistor Q3 through the nineteenth resistor R23.

[0068] It is understood that when the second transistor Q1 turns on and pulls down the control terminal of the third transistor Q3, the third transistor Q3 turns on, transmitting the voltage on the third power line to the control terminal of the fourth transistor Q2, causing the fourth transistor Q2 to turn on, thereby continuing to pull down the control terminal of the third transistor Q3, causing the third transistor Q3 to remain on, thereby continuously driving the protection device Pyrofuse, continuously disconnecting the target circuit, and improving the safety of the target circuit. It is understood that the resistance values ​​of the seventeenth resistor R21 and the eighteenth resistor R20 can be adjusted to prevent the fourth transistor Q2 from turning on prematurely when the third transistor Q3 is not turned on.

[0069] Exemplarily, the first power line provides a low potential voltage, such as ground, the second power line provides a +5V voltage, and the third power line provides a 12V voltage.

[0070] In some embodiments, the circuit breaker triggering device 100 further includes a power module 130 configured to provide corresponding voltages for the first and second power lines. Exemplarily, the power module 130 may be implemented by a power management chip, which converts an external voltage, such as the voltage output by the power module in the battery pack's BMS (Battery Management System), into voltages corresponding to the first and second power lines. Exemplarily, the voltage corresponding to the third power line may be directly provided by the power module in the BMS.

[0071] Exemplarily, the circuit breaker trigger device 100 is placed in the circuit between the battery pack 200 and the load 300, with the target circuit being the main circuit of the battery pack. The main circuit of the battery pack 200 is equipped with a protective device, a shunt, a positive relay S1, a negative relay S2, a pre-charge relay S3, and a pre-charge resistor Ry. The protective device, the pyrofuse, and the positive relay S1 are connected in series between the positive terminal of the battery pack and the first input terminal of the load. The shunt and the negative relay S2 are connected in series between the negative terminal of the battery pack and the second input terminal of the load. The pre-charge relay S3 and the pre-charge resistor Ry are connected in series and then in parallel with the positive relay S1.

[0072] In one embodiment, the control terminal of the second transistor Q1 may be further electrically connected to the BMS, and the BMS may send an active trigger signal Test to turn on the second transistor Q1.

[0073] In order to prevent the trigger signal sent by the trigger judgment circuit 115 and the active trigger signal sent by the BMS from affecting each other, diodes can be set between the output end of the trigger judgment circuit 115 and the control end of the second transistor Q1, and between the BMS and the control end of the second transistor Q1.

[0074] Exemplarily, a first diode D2 is electrically connected between the output terminal of the third operational amplifier U4 and the control terminal of the second transistor Q1. The anode of the first diode D2 is electrically connected to the output terminal of the third operational amplifier U4, and the cathode of the first diode D2 is electrically connected to the control terminal of the second transistor Q1. The control signal output terminal of the BMS is electrically connected to the anode of the second diode D3, and the cathode of the second diode D3 is electrically connected to the control terminal of the second transistor Q1.

[0075] It can be understood that in the embodiment of the present application, the control signal of the circuit breaker trigger device 100 is configured to avoid conflict with the control signal of the BMS, and both can drive the protection device Pyrofuse to control the target circuit to be broken.

[0076] In one embodiment, the BMS can also be electrically connected to the second control terminal of the protection device Pyrofuse through the feedback terminal to detect the triggering state of the protection device Pyrofuse. Exemplarily, the feedback terminal of the BMS is electrically connected to the second control terminal of the protection device Pyrofuse and the end of the resistor 22 close to the second control terminal. The seventeenth resistor R21, the first control terminal of the protection device Pyrofuse and the second control terminal resistor R22 form a state detection circuit. When the protection device Pyrofuse is working, the first control terminal and the second control terminal of the protection device Pyrofuse are in the disconnected state, and the feedback terminal of the BMS receives a low level. Therefore, the BMS can monitor the working state of the protection device Pyrofuse according to the voltage of the feedback terminal.

Claims

1. A circuit breaker triggering device (100), comprising: A judgment module (110), the judgment module (110) being configured to perform an integration operation on a voltage on a shunt in a target circuit to obtain a corresponding integrated voltage, and to generate a trigger signal when the integrated voltage reaches a first threshold, the trigger signal being configured to disconnect the target circuit; The time when the integrated voltage reaches the first threshold is inversely proportional to the voltage on the shunt.

2. The circuit breaker triggering device (100) according to claim 1, wherein: The judgment module (110) comprises: An integration circuit is electrically connected to the shunt, and the integration circuit is configured to perform an integration operation on the voltage on the shunt to obtain the integrated voltage.

3. The circuit breaker triggering device (100) according to claim 2, wherein: The integration circuit includes a first operational amplifier, a first resistor, a second resistor and a first capacitor; The inverting input terminal of the first operational amplifier is configured to receive the voltage on the shunt through the first resistor, the non-inverting input terminal of the first operational amplifier is electrically connected to the first power line through the second resistor, the output terminal of the first operational amplifier is configured to output the integrated voltage, one end of the first capacitor is electrically connected to the inverting input terminal of the first operational amplifier, and the other end of the first capacitor is electrically connected to the output terminal of the first operational amplifier.

4. The circuit breaker triggering device (100) according to claim 3, wherein: The judgment module (110) further comprises an absolute value product circuit (112), wherein the absolute value product circuit (112) is electrically connected between the shunt and the first resistor, and the absolute value product circuit (112) is configured to perform a product operation on the voltage on the shunt to obtain a first operational voltage, and the first operational amplifier is configured to obtain the integrated voltage based on the first operational voltage.

5. The circuit breaker triggering device (100) according to claim 4, wherein: The judgment module (110) further comprises a differential amplifier circuit (111), wherein the differential amplifier circuit (111) is electrically connected between the shunt and the absolute value product circuit (112), and the differential amplifier circuit (111) is configured to amplify the voltage on the shunt and output the amplified voltage to the absolute value product circuit (112).

6. The circuit breaker triggering device (100) according to claim 5, wherein: The differential amplifier circuit (111) comprises a fourth operational amplifier, an eighth resistor, a ninth resistor and a tenth resistor, the in-phase input terminal of the fourth operational amplifier is electrically connected to one end of the shunt through the eighth resistor, the inverting input terminal of the fourth operational amplifier is electrically connected to the other end of the shunt through the ninth resistor, and the output terminal of the fourth operational amplifier is connected to the absolute value product circuit (112), wherein the inverting input terminal of the fourth operational amplifier is electrically connected to the output terminal of the fourth operational amplifier through the tenth resistor.

7. The circuit breaker triggering device (100) according to claim 6, wherein: The absolute value product circuit (112) comprises a product module, the input end of the product module is electrically connected to the output end of the fourth operational amplifier circuit, the output end of the product module is electrically connected to the inverting input end of the first operational amplifier circuit, the differential amplifier circuit is configured to amplify the voltage on the shunt to obtain a second operational voltage, and the product module is configured to perform a product operation on the second operational voltage to obtain the first operational voltage.

8. The circuit breaker triggering device (100) according to claim 4, wherein: The integration circuit (114) further comprises a first transistor, the input end of the first transistor being electrically connected to the output end of the absolute value product circuit (112), and the output end of the first transistor being electrically connected to the first resistor; The judgment module (110) further comprises a threshold judgment circuit (113), wherein an input end of the threshold judgment circuit (113) is electrically connected to an output end of the absolute value product circuit (112), an output end of the threshold judgment circuit (113) is electrically connected to a control end of the first transistor, and the threshold judgment circuit (113) is configured to control the first transistor to be turned on when the first operating voltage is greater than a second threshold.

9. The circuit breaker triggering device (100) according to claim 8, wherein: The threshold judgment circuit (113) comprises a fifth operational amplifier, an eleventh resistor and a twelfth resistor, one end of the eleventh resistor is electrically connected to the second power line, and the other end is electrically connected to one end of the twelfth resistor, the other end of the twelfth resistor is electrically connected to the first power line, the inverting input end of the fifth operational amplifier is electrically connected to the common end of the eleventh resistor and the twelfth resistor, the non-inverting input end of the fifth operational amplifier is electrically connected to the output end of the product module, and the output end of the fifth operational amplifier is electrically connected to the control end of the first transistor.

10. The circuit breaker triggering device (100) according to claim 2, wherein: The judgment module (110) further comprises a trigger judgment circuit (115), wherein the trigger judgment circuit (115) is electrically connected to the output end of the integration circuit, and the trigger judgment circuit (115) is configured to generate the trigger signal when the integration voltage reaches the first threshold value.

11. The circuit breaker triggering device (100) according to claim 10, wherein: The trigger judgment circuit (115) comprises a second operational amplifier, a third operational amplifier, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a seventh resistor; The inverting input terminal of the second operational amplifier is electrically connected to the output terminal of the integration circuit through the third resistor, the non-inverting input terminal of the second operational amplifier is electrically connected to the first power line through the fourth resistor, and the inverting input terminal of the second operational amplifier is electrically connected to the output terminal of the second operational amplifier through the fifth resistor; One end of the sixth resistor is electrically connected to the second power line, the other end of the sixth resistor is electrically connected to one end of the seventh resistor, and the other end of the seventh resistor is electrically connected to the first power line; The non-inverting input terminal of the third operational amplifier is electrically connected to the output terminal of the second operational amplifier, the inverting input terminal of the third operational amplifier is electrically connected to the common terminal of the sixth resistor and the seventh resistor, and the output terminal of the third operational amplifier is configured to output the trigger signal.

12. The circuit breaking trigger device (100) according to any one of claims 1 to 11, further comprising a trigger module (120), wherein the trigger module (120) is electrically connected to the judgment module (110), and the trigger module (120) is configured to drive a protection device on the target circuit according to the trigger signal, and when the protection device is driven, the target circuit is disconnected.

13. The circuit breaker triggering device (100) according to claim 12, wherein: The trigger module (120) comprises: a second transistor, wherein a control end of the second transistor is electrically connected to an output end of the judgment module (110), and an input end of the second transistor is electrically connected to a first power line; A third transistor, wherein the control end of the third transistor is electrically connected to the output end of the second transistor, the input end of the third transistor is electrically connected to the second power line, and the output end of the third transistor is electrically connected to the control end of the protection device.

14. The circuit breaker triggering device (100) according to claim 13, further comprising a power module (130), wherein the power module (130) is configured to provide voltage for the first power line and the second power line.

15. The circuit breaker triggering device (100) according to claim 13, wherein: The control end of the second transistor is also electrically connected to the BMS, and the BMS is configured to send an active touch signal to turn on the second transistor.

16. The circuit breaker triggering device (100) according to claim 15, wherein: The feedback terminal of the BMS is electrically connected to the second control terminal of the protection device, and is configured to monitor the working state of the protection device according to the voltage of the feedback terminal.

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