Low-current electronic safety device and vehicle

Abstract

The utility model discloses a low-current electronic safety device and a vehicle, a control module, a diagnosis module, a wake-up module and an MCU controller are matched with a driving module, the control module can control the driving module to be turned on or turned off, the diagnosis module can monitor the working state of the driving module and output abnormal information, and the wake-up module can send the abnormal information to the MCU controller when a load is in a dormant state. The control module is used for controlling the driving module to be switched from an awakening state to a dormant state so as to reduce static power consumption, effectively controlling the working state of the electronic safety device and improving the reliability of the electronic safety device, and the driving module comprises a driving block, a driving protection self-locking block, a driving closing block and a driving output current limiting block, when the driving circuit is in an overload or short circuit state, the driving output current limiting block can open the driving closing block, the driving closing block can turn off the driving block so as to cut off power input, and meanwhile, the driving protection self-locking block can lock the open state of the driving closing block so as to keep cut-off of the power input.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of fuse, specifically relates to a small current electronic fuse device. BACKGROUND

[0002] The electronic fuse realizes the function of cutting off power supply when the traditional fuse is short-circuited or overloaded through a semiconductor circuit, reduces the fault loss caused by short-circuit or overload of the line; meanwhile, the recoverability of the electronic fuse can also reduce the cost increase and cumbersome operation caused by replacing the fuse.

[0003] The Chinese patent application with the publication number CN 108711826 A discloses a low-power-consumption electronic self-recovery fuse circuit, which comprises an INA200 chip, a current sampling circuit, a logic control circuit, a delay circuit, a protection period control circuit and a power tube for controlling the load, the INA200 chip is provided with an amplifier and a comparator, the current sampling circuit is used for collecting current, converting the current into voltage and inputting the INA200 chip, the input voltage is amplified by the amplifier inside the INA200 chip and then output to the delay circuit, the logic control circuit controls the opening or closing of the power tube, and the protection period control circuit is used for controlling the size of the protection period and realizing automatic reset of the circuit.

[0004] However, the existing electronic fuse generally has large driving power consumption, is relatively wasteful for small current load application, has high cost, and cannot effectively control the work of the electronic fuse to ensure the work stability and reliability of the electronic fuse.

[0005] Therefore, how to reduce the power consumption of the electronic fuse and stably and reliably control the working state of the electronic fuse has become a problem to be solved in the field. SUMMARY

[0006] In view of the defects of the prior art, the utility model aims at providing a small current electronic fuse device with low power consumption, stable and reliable work and a vehicle.

[0007] In order to achieve the above-mentioned purpose, the small current electronic fuse device provided by the utility model comprises a driving module and an MCU controller, the driving module is configured to be able to cut off the driving output, and further comprises a control module, a diagnosis module and a wake-up module,

[0008] The control module is connected with the driving module and the MCU controller at both ends and is configured to be able to control the driving module to be turned on or turned off,

[0009] The diagnosis module is connected with the driving module and the MCU controller at both ends and is configured to be able to monitor the working state of the driving module and output abnormal information,

[0010] The wake-up module is connected to the driver module and the MCU controller at both ends, and is configured to control the driver module to switch between sleep and wake-up states.

[0011] Furthermore, the driving circuit of the driving module includes a driving block, a driving protection self-locking block, a driving shutdown block, and a driving output current limiting block. The driving block is configured to enable the driving module and control the power input to the driving circuit. The driving output current limiting block is configured to determine whether the driving output exceeds a preset threshold and correspondingly control the opening and closing state of the driving shutdown block. The driving shutdown block is configured to control the opening and closing state of the driving block. The driving protection self-locking block is configured to lock and unlock the opening state of the driving shutdown block.

[0012] Furthermore, the driving block includes a driving switch, the collector of which is connected to the power input terminal and the first terminal of the first resistor, the base of which is connected to the second terminal of the first resistor, and the emitter of which is connected to the first terminal of the seventh resistor and the first terminal of the third capacitor, respectively. The second terminal of the seventh resistor and the second terminal of the third capacitor are respectively connected to the driving output terminal.

[0013] Furthermore, the drive protection self-locking block includes a drive protection self-locking switch and a second resistor. The source and gate of the drive protection self-locking switch are respectively connected to the first and second ends of the first resistor, and the drain is connected to the first end of the second resistor.

[0014] Furthermore, the drive-off block includes a drive-off switch, the collector of which is connected to the gate of the drive-protection self-locking switch, the base of which is connected to the first end of the third resistor, the first end of the first capacitor, and the fourth resistor, respectively, and the emitter is connected to the second end of the third resistor and the second end of the first capacitor, respectively.

[0015] Furthermore, the drive output current limiting block includes a drive output current limiting switch. The collector of the drive output current limiting switch is connected to the drive shutdown block, the emitter is connected to the first end of the fifth resistor, the first end of the second capacitor, and the first end of the seventh resistor, respectively, and the base is connected to the second end of the fifth resistor, the second end of the second capacitor, and the first end of the sixth resistor, respectively.

[0016] Furthermore, the control module is connected to the drive protection self-locking block, including a shutdown circuit and a reset circuit. The shutdown circuit includes a reverse protection diode, the negative terminal of which is connected to the drive protection self-locking block, and the positive terminal is connected to the OFF signal terminal. The reset circuit includes an RST signal terminal.

[0017] Furthermore, the diagnostic module includes an enable circuit, a diagnostic circuit, and an output voltage sampling circuit. The diagnostic circuit includes a diagnostic switch, the emitter of which is connected to the drive output current limiting block, the base of which is connected to the enable circuit, and the collector of which is connected to the output voltage sampling circuit. The enable circuit includes a DIA_EN enable diagnostic signal terminal, and the output voltage sampling circuit includes a DIA diagnostic signal terminal.

[0018] Furthermore, the wake-up module includes a wake-up switch Q8 and a WK wake-up signal terminal. The collector of the wake-up switch Q8 is connected to the WK wake-up signal terminal, and the emitter is connected to the drive module.

[0019] To achieve the above objectives, the vehicle provided by this utility model is equipped with the aforementioned low-current electronic fuse device.

[0020] The low-current electronic fuse device and vehicle provided by this utility model employ a control module, a diagnostic module, a wake-up module, and an MCU controller working in conjunction with a drive module. This allows the control module to control the drive module to turn on or off, the diagnostic module to monitor the working status of the drive module and output abnormal information, and the wake-up module to control the drive module to switch from wake-up to sleep state when the load is in sleep mode. This reduces the static power consumption of the electronic fuse device, effectively controls the working status of the electronic fuse device, and improves its reliability.

[0021] Furthermore, the drive circuit of the drive module includes a drive block, a drive protection self-locking block, a drive shutdown block, and a drive output current limiting block. The drive block can control the power input drive circuit. When the drive output exceeds a preset threshold, the drive circuit is in an overload or short-circuit state. The drive output current limiting block can open the drive shutdown block, causing the drive shutdown block to turn off the drive block to cut off the power input. At the same time, the drive protection self-locking block can lock the open state of the drive shutdown block to maintain the power input cut-off, thereby ensuring the stable and reliable operation of the drive module. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] Figure 1 System block diagram of the low-current electronic fuse device provided by this utility model;

[0024] Figure 2 This is a system block diagram of the drive module in this utility model;

[0025] Figure 3 This is a circuit diagram of the drive module in this utility model;

[0026] Figure 4 This is the overall circuit diagram of the electronic safety device in this utility model;

[0027] Figure 5 This is a circuit diagram of the control module in this utility model;

[0028] Figure 6 This is a circuit diagram of the diagnostic module in this utility model;

[0029] Figure 7 This is a circuit diagram of the wake-up module in this utility model;

[0030] Figure label:

[0031] 100. Driver module; 200. Control module; 210. Shutdown circuit; 220. Reset circuit; 300. Diagnostic module; 310. Enable circuit; 320. Diagnostic circuit; 330. Output voltage sampling circuit; 400. Wake-up module; 500. MCU controller. Detailed Implementation

[0032] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0033] See Figure 1 The illustration shows an example of a low-current electronic fuse device provided by this utility model.

[0034] As shown in the figure, the low-current electronic fuse device in this example mainly includes a drive module 100, a control module 200, a diagnostic module 300, a wake-up module 400, and an MCU controller 500.

[0035] The control module 200, diagnostic module 300, wake-up module 400 and MCU controller 500 can cooperate with the drive module 100 to turn the drive module 100 on and off, diagnose and wake it up, thereby effectively controlling the working state of the drive module 100 and improving the reliability of the drive module 100.

[0036] Combination Figure 2 The drive module 100 includes a drive circuit including a drive block 110, a drive protection self-locking block 120, a drive shutdown block 130, and a drive output current limiting block 140. The drive block 110, drive protection self-locking block 120, drive shutdown block 130, and drive output current limiting block 140 can cooperate with each other to ensure that the drive module 100 can maintain the power input cut off when the drive circuit is overloaded or short-circuited, so as to ensure the stable and reliable operation of the drive module 100.

[0037] Meanwhile, in the initial state, the drive block 110 is in the open state, while the drive protection self-locking block 1200, the drive shutdown block 130, and the drive output current limiting block 140 are in the closed state. This allows the drive block 110 to work normally in the initial state, while the other areas are in the closed state, so that there is no direct static power consumption in the drive circuit, thereby achieving ultra-low static power consumption.

[0038] Furthermore, the drive block 110 of the drive module 100 is configured to enable the drive module 100 and control the power input drive circuit. The drive output current limiting block 140 is configured to determine whether the drive output exceeds a preset threshold and correspondingly control the opening and closing state of the drive shutdown block 130. The drive shutdown block 130 is configured to control the opening and closing state of the drive block 110. The drive protection self-locking block 120 is configured to lock and unlock the opening state of the drive shutdown block 130. This allows the drive output current limiting block 140 to enable the drive shutdown block 130 when the drive circuit is overloaded or short-circuited, so that the drive shutdown block 130 can control the drive block 110 to shut down, thereby cutting off the power input. At the same time, the drive protection self-locking block 120 can lock the opening state of the drive shutdown block 130 to lock the shutdown state of the drive block 110, thereby ensuring the power input is cut off.

[0039] Correspondingly, when the drive circuit is no longer overloaded or short-circuited, the drive protection self-locking block 120 can unlock the open state of the drive shutdown block 130 so that the drive block 110 can be restarted, controlling the power input to the drive circuit to realize the shutdown and self-recovery of the drive module 100.

[0040] Combination Figure 3 Specifically, the circuit of the driving block 110 includes a driving switch Q1 and a first resistor R1 connected in parallel. The collector of the driving switch Q1 is connected to the power input terminal and the first terminal of the first resistor R1, the base is connected to the second terminal of the first resistor R1, and the emitter is connected to the first terminal of the seventh resistor R7 and the first terminal of the third capacitor C3, respectively. The second terminal of the seventh resistor R7 and the second terminal of the third capacitor C3 are respectively connected to the driving output terminal OUTPUT.

[0041] Furthermore, the drive protection self-locking block 120 includes a drive protection self-locking switch Q2 and a second resistor R2. The drive protection self-locking switch Q2 is preferably composed of a MOS transistor. The source and gate of the drive protection self-locking switch Q2 are respectively connected to the first end and the second end of the first resistor R1, and the drain is connected to the first end of the second resistor R2. The second end of the second resistor R2 is connected to the drive shutdown block 130.

[0042] Correspondingly, the drive shutdown block 130 includes a drive shutdown switch Q3. The collector of the drive shutdown switch Q3 is connected to the gate of the drive protection self-locking switch Q2. The base of the drive shutdown switch Q3 is connected to the first end of the third resistor R3, the first end of the first capacitor C3, and the fourth resistor R4. The emitter is connected to the second end of the third resistor R3 and the second end of the first capacitor C3. The second end of the third resistor R3 is also grounded.

[0043] Furthermore, the drive output current limiting block 140 includes a drive output current limiting switch Q4. The collector of the drive output current limiting switch Q4 is connected to the second terminal of the fourth resistor R4 in the drive shutdown block 130. The emitter of the drive output current limiting switch Q4 is connected to the first terminal of the fifth resistor R5, the first terminal of the second capacitor C2, and the first terminal of the seventh resistor R7, respectively. The base of the drive output current limiting switch Q4 is connected to the second terminal of the fifth resistor R5, the second terminal of the second capacitor C2, and the first terminal of the sixth resistor R6, respectively.

[0044] The drive block 110, drive protection self-locking block 120, drive shutdown block 130 and drive output current limiting block 140 formed by this are interconnected to form the drive module 100 as a whole.

[0045] Specifically, see Figure 3 In the drive module 100, the collector of drive switch Q1 is connected to the power input terminal, the first terminal of the first resistor R1, and the source of drive protection self-locking switch Q2. The base of drive switch Q1 is connected to the second terminal of the first resistor R1, the gate of drive protection self-locking switch Q2, and the collector of drive shutdown switch Q3. The emitter of drive switch Q1 is connected to the first terminals of the third capacitor C3, the seventh resistor R7, the second capacitor C2, and the fifth resistor R5, as well as the emitter of drive output current limiting switch Q4. The drain of drive protection self-locking switch Q2 is connected to the first terminal of the second resistor R2. The drive shutdown switch Q3... The emitter is connected to the first terminal of the third resistor R3 and the first terminal of the first capacitor C1. The base of the drive switch Q3 is connected to the second terminal of the third resistor R3 and the first terminal of the first capacitor C1 and the first terminal of the fourth resistor R4. The second terminal of the fourth resistor R4 is connected to the second terminal of the second resistor R2 and the collector of the drive output current limiting switch Q4. At the same time, the base of the drive output current limiting switch Q4 is connected to the second terminal of the fifth resistor R5 and the second terminal of the second capacitor C2 and the first terminal of the sixth resistor R6. The second terminal of the sixth resistor R6 is connected to the second terminal of the seventh resistor R7 and the third capacitor C3 and the drive output terminal OUTPUT.

[0046] This constitutes the drive module 100. In the drive circuit of the drive module 100, the first resistor R1 constitutes the opening resistor of the drive switch Q1 and the opening bias resistor of the drive protection self-locking switch Q2; the second resistor R2 constitutes the current limiting resistor of the drive protection self-locking switch Q2, so that the voltage after the drive protection self-locking switch Q2 is opened can match the opening voltage requirement of the drive shutdown switch Q3, while reducing the power consumption of the drive circuit after short circuit protection; the third resistor R3 constitutes the opening bias resistor of the drive shutdown switch Q3; the fourth resistor R4 constitutes the opening current limiting resistor of the drive shutdown switch Q3; the fifth resistor R5 constitutes the opening bias resistor of the drive output current limiting switch Q4; the sixth resistor R6 constitutes the opening current limiting resistor of the drive output current limiting switch Q4; and the seventh resistor R7 constitutes the output current sampling resistor of the drive output terminal OUTPUT.

[0047] Furthermore, in specific applications, the power input terminal of this drive module 100 is KL30, which is the positive terminal of the battery, providing low-voltage power. The voltage of KL30 is preferably 9-16V to adapt to small current loads. When the drive switch Q1 is turned on, the current at the power input terminal KL30 can be input into the drive module 100 and output from the drive output terminal OUTPUT.

[0048] Meanwhile, the drive output terminal OUTPUT includes a third capacitor C3 and a seventh resistor R7. The third capacitor C3 can prevent the current surge generated when the electronic fuse is first connected to the load from shutting off the current, which would prevent the drive module 100 from being turned on. The seventh resistor R7 can calculate the current by measuring the voltage difference between the two ends, so as to detect the output current Io and the corresponding output voltage Uo of the power supply.

[0049] Therefore, combined Figure 3 The three terminals of the drive switch Q1 are connected to the power input terminal KL30, the first resistor R1, and the drive output terminal OUTPUT, respectively. Uc is the collector voltage of the drive switch Q1 at the port where it is connected to the power input terminal KL30, Ic is the collector current of the drive switch Q1 at the port where it is connected to the power input terminal KL30, Ub is the base voltage of the drive switch Q1 at the port where it is connected to the first resistor R1, Ib is the base current of the drive switch Q1 at the port where it is connected to the first resistor R1, Ue is the emitter voltage of the drive switch Q1 at the port where it is connected to the drive output terminal OUTPUT, and Ie is the emitter current of the drive switch Q1 at the port where it is connected to the drive output terminal OUTPUT.

[0050] Since in the initial state, the drive block 110 is in the open state, the drive protection self-locking block 120, the drive shutdown block 130 and the drive output current limiting block 140 are in the closed state, the base current Ib of the drive switch Q1 is equal to the current flowing through the first resistor R1. Therefore, we can get Ib=(Uc-Ub) / R1, Ic=βIb, Ie=Ib+Ic=(1+β)Ib.

[0051] Furthermore, since Uc is equal to the voltage at the power input terminal KL30, we can obtain Ub = Uc - Ib × R1 and Ue = Ub - Ube. In the formula, Ube is the voltage between the b and c terminals. At the same time, Ube is a PN junction voltage drop, which is usually around 0.6V. That is, Ue = Ub - 0.6V = Uc - Ib × R1 - 0.6V. Ib is usually very small, so Ib × R1 is also very small, that is, Ub ≈ Uc. Therefore, Ue ≈ Uc - 0.6V.

[0052] Since the power input terminal KL30 is 9-16V, the voltage range of Ue is approximately 8.4-15.4V. This electronic fuse is applied to a low-current load. Since the current limiting of the low-current load is small, the output current Io is small, so Io = Ie. Therefore, Ib is also small, making Ub≈Uc true.

[0053] Furthermore, the seventh resistor R7 driving the output terminal OUTPUT is usually small, and the output current Io is also small. In the initial state, i.e., the normal operating state, the resistance Up of the seventh resistor R7 is very small, i.e., Uo≈Ue, following the voltage fluctuation of the driving output terminal OUTPUT. In the initial state, under normal operating conditions, the voltage range of this electronic fuse is about 8.4-15.4V to achieve low power consumption.

[0054] In conjunction with this, the drive output current limiting block 140 can turn on the drive shutdown block 130 and turn off the drive block 110 when the drive circuit is under load short circuit or overload.

[0055] Specifically, when the output current Io of the drive output terminal OUTPUT gradually or instantaneously increases and exceeds the preset threshold, causing the drive circuit to be in a load short circuit or overload, the resistance Up of the seventh resistor R7 will gradually or instantaneously increase to turn on the drive output current limiting switch Q4, so that the drive output current limiting switch Q4 can turn on the drive shutdown block 130.

[0056] Meanwhile, the fifth resistor R5 provides bias current to the drive output current limiting switch Q4, ensuring that the drive output current limiting block 140 circuit can work stably and the drive output current limiting switch Q4 can be turned on normally.

[0057] Furthermore, the second capacitor C2 and the sixth resistor R6 constitute a drive output current limiting RC filter circuit to prevent the drive output current limiting switch Q4 from being accidentally turned on when the circuit of the drive output current limiting block 140 is affected by external interference, so as to ensure that the drive shutdown block 130 will not be turned on by mistake and improve the working reliability of this electronic fuse device.

[0058] In order to stabilize the working state of the drive shutdown block 130 and effectively control the opening and closing of the drive block 110, when the drive circuit is under load short circuit or overload, the drive protection self-locking block 120 can lock the open state of the drive block 130 to prevent the drive block 110 from being opened again before the load short circuit fault is truly eliminated.

[0059] Specifically, when the drive output current limiting switch Q4 turns on the drive turn-off switch Q3, the Ub voltage is pulled down to 0V, and then the Ue voltage becomes 0V, so as to turn off the drive switch Q1 of the drive block 110, thereby achieving the purpose of turning off the output and protecting the circuit.

[0060] Furthermore, when Ub is pulled down to 0V, the Ugs voltage of the drive switch Q2 will be greater than the turn-on voltage to turn on the drive switch Q2. At this time, the current flows through the second resistor R2 and the fourth resistor R4, so that the voltage of the drive protection self-locking block 120 is matched with the turn-on voltage of the drive shut-off switch Q3, thereby locking the open state of the drive shut-off switch Q3 and keeping the drive switch Q1 closed.

[0061] Meanwhile, the first resistor R1 in the drive block 110 also serves as the opening bias resistor for the drive switch Q2, and the fourth resistor R4 serves as the current limiting resistor for the drive shut-off switch Q3, so as to ensure the stable operation of the drive protection self-locking block 120 and the drive shut-off block 130.

[0062] Furthermore, the first capacitor C1 and the fourth resistor R4 in the drive-off block 130 constitute a drive-off RC filter circuit to prevent the drive-off switch Q3 from being accidentally turned on when the circuit of the drive-off block 130 is affected by external interference, thus providing reliability for this electronic safety device.

[0063] The drive module 100 thus formed works in cooperation with the drive block 110, the drive protection self-locking block 120, the drive shutdown block 130 and the drive output current limiting block 140 to ensure that the drive module 100 can cut off the power input and lock the drive block 110 in the off state when the drive circuit is overloaded or short-circuited, so as to ensure the stable and reliable operation of the drive module 100.

[0064] Furthermore, since the drive protection self-locking block 120, drive shutdown block 130, and drive output current limiting block 140 are all in the off state when the drive block 110 is in normal output mode, the entire drive circuit has no direct static power consumption. Even if the drive protection self-locking block 120, drive shutdown block 130, and drive output current limiting block 140 generate leakage current, the leakage current is in the nA level, which is very weak, thus achieving ultra-low static power consumption of the drive circuit.

[0065] Combination Figure 1 and Figure 4In order to control the working state of the drive module 100, this electronic fuse device also includes a control module 200, a diagnostic module 300, a wake-up module 400 and an MCU controller 500 connected to the drive module 100, so that the control module 200, the diagnostic module 300, the wake-up module 400 and the MCU controller 500 cooperate with each other to effectively control the drive module 100 and improve the reliability of this electronic fuse device.

[0066] Combination Figure 5 Furthermore, the control module 100 is configured to control the drive module 100 to turn on or off. When the drive circuit is short-circuited or overloaded, the control module 100 can turn off the drive module 100 through the MCU controller 500. Correspondingly, when the drive module 100 cuts off the power input, if the overload or short-circuit fault is removed, the control module 100 can also reset the drive module 100 in time through the MCU controller 500 to restore the output power supply capability.

[0067] Specifically, the control module 200 is connected to the drive protection self-locking block 120 of the drive module 100, including a shutdown circuit 210 and a reset circuit 220. The shutdown circuit 210 includes a reverse protection diode D1. The negative terminal of the reverse protection diode D1 is connected to the second end of the second resistor R2 in the drive protection self-locking block 120, and the positive terminal of the reverse protection diode D1 is connected to the OFF signal terminal. The reverse protection diode D1 can prevent the voltage of about 12V at the power input terminal KL30 from being connected to the OFF signal terminal after the drive switch Q2 is turned on, so as to ensure the stable operation of the electronic fuse device.

[0068] Meanwhile, when the OFF signal terminal is set to a high level, the anti-reverse diode D1 can turn on the drive shutdown switch Q3, thereby turning off the drive switch Q1 and achieving the purpose of cutting off the power input. At this time, the drive switch Q2 will turn on, locking the on state of the drive shutdown switch Q3 to maintain the power input cut-off state of the drive module 100.

[0069] Furthermore, the reset circuit 220 of the control module 200 includes a reset switch Q5. The collector of the reset switch Q5 is connected to the second end of the second resistor R2 in the drive protection self-locking block 120, and the base is connected to the first ends of the eighth resistor R8 and the ninth resistor R9 respectively. The second end of the eighth resistor R8 is grounded, and the second end of the ninth resistor R9 is connected to the RST signal.

[0070] Therefore, the eighth resistor R8 constitutes the bias resistor of the reset switch Q5, and the ninth resistor R9 constitutes the current limiting resistor of the reset switch Q5.

[0071] Furthermore, when the RST signal terminal is set to a high level, the reset switch Q5 can turn off the drive off switch Q3, thereby turning off the drive switch Q2, so as to unlock the open state of the drive off switch Q3, thereby turning on the drive switch Q1, resetting the drive module 100, and turning on the power input.

[0072] Combination Figure 6 Furthermore, the diagnostic module 300 is configured to monitor the operating status of the drive module 100 and output abnormal information. The diagnostic module 300 includes an enable circuit 310, a diagnostic circuit 320, and an output voltage sampling circuit 330, so that the enable circuit 310, the diagnostic circuit 320, and the output voltage sampling circuit 330 cooperate to diagnose the drive module 100 and reduce power consumption.

[0073] Specifically, the diagnostic circuit 310 includes a diagnostic switch Q7. The emitter of the diagnostic switch Q7 is connected to the second terminal of the sixth resistor R6 and the first terminal of the tenth resistor R10 in the drive output current limiting block 140, respectively. The collector of the diagnostic switch Q7 is connected to the first terminal of the fourteenth resistor R14 in the output sampling circuit 330, and the base of the diagnostic switch Q7 is connected to the second terminal of the tenth resistor R10 and the first terminal of the eleventh resistor R11, respectively.

[0074] Furthermore, in the output sampling circuit 330, the second end of the fourteenth resistor R14 is connected to the DIA diagnostic signal terminal and the fifteenth resistor R15, respectively; the second end of the eleventh resistor R11 is connected to the enable circuit 310.

[0075] Furthermore, the enable circuit 310 includes an enable switch Q6. The collector of the enable switch Q6 is connected to the second terminal of the eleventh resistor R11, and the base of the enable switch Q6 is connected to the first terminal of the twelfth resistor R12 and the first terminal of the thirteenth resistor R13. The second terminal of the twelfth resistor R12 is connected to the DIA_EN enable diagnostic signal terminal, and the second terminal of the thirteenth resistor R13 is grounded.

[0076] In the diagnostic module 300 thus constructed, the tenth resistor R10 constitutes the bias resistor of the diagnostic switch Q7, the eleventh resistor R11 constitutes the current limiting resistor of the diagnostic switch Q7, the twelfth resistor R12 constitutes the current limiting resistor of the enable switch Q6, and the thirteenth resistor R13 constitutes the bias resistor of the enable switch Q6.

[0077] Furthermore, enable switch Q6 and diagnostic switch Q7 enable the connection between diagnostic module 300 and drive module 200 to be cut off when the drive circuit is in an ultra-low power state, thereby reducing power consumption. The DIA_EN enable diagnostic signal terminal can turn on diagnostic module 300 when it is high.

[0078] Meanwhile, the output voltage Uo of the drive circuit can be detected by the fourteenth resistor R14 and the fifteenth resistor R15 of the output voltage sampling circuit 330 and the DIA diagnostic signal terminal, so as to determine whether the drive output state meets the load requirements, thereby ensuring that the drive module 100 works normally.

[0079] When the output voltage sampling circuit 330 detects that the output voltage Uo is overloaded, the enable circuit 320 activates the diagnostic circuit 310 to diagnose the drive module 100, outputs abnormal information, namely the output voltage Uo, and promptly reports the information to the vehicle controller after processing by the MCU controller 500, so as to better notify maintenance personnel to troubleshoot.

[0080] Combination Figure 7 In order to reduce the power consumption of this electronic fuse, the wake-up module 400 is configured to control the drive module 100 to switch between sleep and wake-up states. When the load connected to this electronic fuse goes into sleep mode and the electronic fuse also enters ultra-low operating mode, the drive module enters sleep mode to reduce power consumption. When the load enters normal operating mode from sleep mode, the wake-up module 400 controls the drive module 100 to switch from sleep mode to wake-up state to monitor the drive circuit.

[0081] Specifically, the wake-up module 400 is connected to the drive output terminal OUTPUT, including a wake-up switch Q8. The collector of the wake-up switch Q8 is connected to the WK wake-up signal terminal and the eighteenth resistor R18, respectively. The emitter is connected to the first terminal of the fourth capacitor C4 and the seventeenth resistor R17 and the first terminal of the third capacitor C3D on the drive module 100, respectively. The base of the wake-up switch Q8 is connected to the second terminal of the fourth capacitor C4 and the seventeenth resistor R17 and the first terminal of the sixteenth resistor R16, respectively. The second terminal of the sixteenth resistor R16 is connected to the second terminal of the third capacitor C3D.

[0082] The wake-up module 400 thus constitutes a wake-up module where, when the load current does not reach the wake-up threshold, the signal at the WK wake-up signal terminal is low, causing the drive module 100 to be in a sleep state. Correspondingly, when the load current reaches the wake-up threshold, the voltage difference generated across the seventeenth resistor R17 satisfies the turn-on voltage of the wake-up switch Q8, causing the wake-up switch Q8 to turn on, which in turn changes the signal at the WK wake-up signal terminal from low to high, generating a wake-up signal and switching the drive module 100 to the wake-up state, allowing it to continue working normally.

[0083] Furthermore, the sixteenth resistor R16 and the fourth capacitor C4 constitute a wake-up filter RC circuit to prevent abnormal jitter of the output of the WK wake-up signal terminal from accidentally triggering the wake-up switch Q8, thus ensuring the low power consumption and reliability of this electronic safety device.

[0084] Thus, the control module 200, diagnostic module 300, and wake-up module 400 can cooperate with each other to control the start and stop, monitor, and wake up the drive module 100 from sleep, thereby improving the reliability of this electronic safety device.

[0085] As an example, in some embodiments, in order to effectively control the working states of the control module 200, the diagnostic module 300 and the wake-up module 400, the MCU controller 500 is configured to monitor and determine the working states of the control module 200, the diagnostic module 300 and the wake-up module 400, and control the working state of the drive module 100 accordingly based on the determination structure.

[0086] For example, the MCU controller 500 is connected to the OFF signal terminal and the RST signal terminal of the control module 200 to determine the output signal of the control module 200, thereby controlling the drive module 100 to shut down or reset. It is also connected to the DIA_EN enable diagnostic signal terminal and the DIA diagnostic signal terminal of the diagnostic module 300 to determine the diagnostic structure of the diagnostic module 200, receive abnormal information, and report it to the vehicle controller. At the same time, the MCU controller 500 is connected to the WK wake-up signal terminal of the wake-up module 400 to determine the output signal of the wake-up module 400 and control the drive module 100 to switch between sleep state and wake-up state.

[0087] This constitutes the low-current electronic fuse device provided by this utility model.

[0088] This utility model also provides a vehicle in which a low-current electronic fuse device configured with the above-described scheme is provided to provide overload protection for low-current loads in the vehicle.

[0089] The following example illustrates the working process of this utility model in a specific application. It should be noted that the content described here is only a specific application example of this solution and does not constitute a limitation on this solution.

[0090] In the initial state, the drive block 110 of the drive module 100 is in the open state, while the drive protection self-locking block 1200, the drive shutdown block 130, and the drive output current limiting block 140 are in the closed state, so that the drive circuit as a whole has no direct static power consumption, thus achieving ultra-low static power consumption of this electronic safety device.

[0091] When the drive switch Q1 of the drive block 110 is turned on, the current at the power input terminal KL30 can be input into the drive module 100 and output from the drive output terminal OUTPUT. The seventh resistor R7 at the drive output terminal OUTPUT detects the magnitude of the power supply output current Io and the corresponding output voltage Uo.

[0092] When the output current Io of the drive output terminal OUTPUT gradually or instantaneously increases and exceeds the preset threshold, causing the drive circuit to be in a load short circuit or overload, the resistance Up of the seventh resistor R7 will gradually or instantaneously increase to turn on the drive output current limiting switch Q4, so that the drive output current limiting switch Q4 can turn on the drive shutdown block 130.

[0093] At this time, when the drive output current limiting switch Q4 turns on and the drive turn-off switch Q3 turns off, the Ub voltage is pulled down to 0V, and then the Ue voltage becomes 0V, so as to turn off the drive switch Q1 of the drive block 110, thereby achieving the purpose of turning off the output and protecting the circuit.

[0094] When Ub is pulled down to 0V, the Ugs voltage of the drive switch Q2 will be greater than the turn-on voltage, so as to turn on the drive switch Q2. The voltage of the drive protection self-locking block 120 is matched with the turn-on voltage of the drive shut-off switch Q3 through the fourth resistor R4, thereby locking the turn-off state of the drive shut-off switch Q3 and keeping the drive switch Q1 off.

[0095] Furthermore, after the drive circuit is troubleshooted, it is no longer under load short circuit or overload. The RST signal terminal of the control module 200 is set to a high level, which causes the reset switch Q5 to close the drive shutdown switch Q3, thereby closing the drive switch Q2, unlocking the open state of the drive shutdown switch Q3, thus opening the drive switch Q1, resetting the drive module 100, and turning on the power input.

[0096] During this process, the control module 200, diagnostic module 300, wake-up module 400 and MCU controller 500 can cooperate with each other to control the drive module 100 to shut down or reset, diagnose the drive module 100, and report abnormal information to the vehicle controller.

[0097] When the load is in sleep mode, the wake-up module 400 controls the drive module 100 to enter sleep mode through the MCU controller 500 to reduce static power consumption. When the load wakes up and enters normal working state, the wake-up module 400 controls the drive module 100 to switch to wake-up state through the MCU controller 500 to continue monitoring the drive circuit.

[0098] The low-current electronic fuse device provided by the present invention achieves ultra-low static power consumption and effectively controls the working state of the drive module 100 by cooperating with the drive module 100, control module 200, diagnostic module 300, wake-up module 400 and MCU controller 500, thereby improving the reliability of the electronic fuse device.

[0099] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A small current electronic fuse device comprising a drive module and an MCU controller, the drive module configured to be able to cut off a drive output, characterized in that, Further comprising a control module, a diagnosis module and a wake-up module, The control module is connected with the driving module and the MCU controller respectively at two ends, and is configured to control the driving module to be turned on or turned off. The diagnosis module is connected with the driving module and the MCU controller respectively at two ends, and is configured to monitor the working state of the driving module and output abnormal information. The wake-up module is connected with the driving module and the MCU controller respectively at two ends, and is configured to control the driving module to switch between the sleep state and the wake-up state.

2. The low current electronic relay of claim 1, wherein, The driving circuit of the driving module comprises a driving block, a driving protection self-locking block, a driving closing block and a driving output current limiting block, the driving block is configured to turn on the driving module and control the power supply to input the driving circuit, the driving output current limiting block is configured to determine whether the driving output exceeds a preset threshold value and correspondingly control the opening and closing state of the driving closing block, the driving closing block is configured to control the opening and closing state of the driving block, and the driving protection self-locking block is configured to lock and unlock the opening state of the driving closing block.

3. The low current electronic relay of claim 2, wherein, The driving block comprises a driving switch, the collector of the driving switch is connected with the power input end and the first end of the first resistor, the base is connected with the second end of the first resistor, and the emitter is connected with the first end of the seventh resistor and the first end of the third capacitor respectively, and the second end of the seventh resistor and the second end of the third capacitor are connected with the driving output end respectively.

4. The low current electronic relay of claim 3, wherein, The driving protection self-locking block comprises a driving protection self-locking switch and a second resistor, the source and the gate of the driving protection self-locking switch are connected with the first end and the second end of the first resistor respectively, and the drain is connected with the first end of the second resistor.

5. The low current electronic relay of claim 4, wherein, The driving closing block comprises a driving closing switch, the collector of the driving closing switch is connected with the gate of the driving protection self-locking switch, the base is connected with the first end of the third resistor, the first end of the first capacitor and the fourth resistor respectively, and the emitter is connected with the second end of the third resistor and the second end of the first capacitor respectively.

6. The low current electronic relay of claim 5, wherein, The driving output current limiting block comprises a driving output current limiting switch, the collector of the driving output current limiting switch is connected with the driving closing block, the emitter is connected with the first end of the fifth resistor, the first end of the second capacitor and the first end of the seventh resistor respectively, and the base is connected with the second end of the fifth resistor, the second end of the second capacitor and the first end of the sixth resistor respectively.

7. The low current electronic relay of claim 2, wherein, The control module is connected with the driving protection self-locking block and comprises a closing circuit and a reset circuit, the closing circuit comprises an anti-reverse diode, the negative electrode of the anti-reverse diode is connected with the driving protection self-locking block, the positive electrode is connected with the OFF signal end, and the reset circuit comprises the RST signal end.

8. The low current electronic relay of claim 7, wherein, The diagnosis module comprises an enabling circuit, a diagnosis circuit and an output voltage sampling circuit, the diagnosis circuit comprises a diagnosis switch, the emitter of the diagnosis switch is connected with the driving output current limiting block, the base is connected with the enabling circuit, and the collector is connected with the output voltage sampling circuit, the enabling circuit comprises the DIA_EN enabling diagnosis signal end, and the output voltage sampling circuit comprises the DIA diagnosis signal end.

9. The low current electronic relay of claim 8, wherein, The wake-up module comprises a wake-up switch Q8 and a WK wake-up signal end, the collector of the wake-up switch Q8 is connected with the WK wake-up signal end, and the emitter is connected with the driving module.

10. A vehicle characterized by comprising: The small current electronic fuse device is arranged in the vehicle.

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