Domain-control automatic circuit breaking circuit
By using a domain-controlled automatic circuit designed entirely in hardware, and by controlling the MOS driver chip with undervoltage detection and RC delay circuit, the problem of increased static power consumption when the module is working after the vehicle is in sleep mode is solved, thus achieving low power consumption and stable hardware control.
Patent Information
- Application Number
- CN202423257531.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2034-12-27
AI Technical Summary
In existing technologies, multiple modules continue to operate after the vehicle goes into sleep mode, leading to increased static power consumption. Furthermore, the MCU cannot effectively reduce power consumption when monitoring voltage, resulting in excessive standby power consumption.
The domain-controlled automatic circuit breaking circuit, which adopts a pure hardware design, includes an undervoltage detection circuit and a MOS driver chip. It detects voltage through a reset circuit and an RC delay circuit, controls the switching state of the MOS driver chip, and avoids ineffective shutdown.
It achieves low power consumption and high stability hardware control, avoids invalid shutdown due to system crashes or program errors, reduces the standby power consumption of the whole vehicle, and has a simple and compact circuit.
Smart Images
Figure CN223829220U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of circuit breaking technology, and in particular to a domain-controlled automatic circuit breaking circuit. Background Technology
[0002] With the popularization of new energy vehicles, the number of advanced electrical technologies used in vehicles is constantly increasing. Some convenient technologies require the vehicle to enter a sleep state before they can be executed, such as remote preheating of seats and steering wheels, remote vehicle start, and remote monitoring by dashcams. These modules that can be remotely activated continue to work silently after the vehicle enters sleep mode, albeit with reduced power consumption. However, the simultaneous operation of so many modules can increase the overall static power consumption of the vehicle. Therefore, prioritizing the protection of critical modules according to their importance, while ensuring that the vehicle's battery does not run out of power, becomes crucial.
[0003] Many modules now use MCUs to monitor voltage and shut down the module when the voltage drops below a certain level. MCUs also require current to operate; if they enter sleep mode to reduce power consumption but cannot monitor the voltage, standby power consumption will be excessive. Utility Model Content
[0004] This utility model aims to provide a small-sized, low-power, purely hardware-controlled automatic circuit disconnection circuit to solve the aforementioned technical problems. The technical solution is as follows:
[0005] A domain-controlled automatic circuit breaker includes a power input terminal, a drive output terminal and a ground terminal, as well as an undervoltage detection circuit and a MOS driver chip;
[0006] The undervoltage detection circuit includes a first resistor voltage divider circuit and a reset circuit;
[0007] The power input terminal is connected to the MOS driver chip to supply power to the MOS driver chip; and is also connected to the input terminal of the reset circuit through the first resistor voltage divider circuit.
[0008] The reset circuit has hysteresis characteristics. When the input voltage is detected to be lower than the lower hysteresis threshold, it outputs a low-level signal, and when the input voltage is detected to be higher than the upper hysteresis threshold, it outputs a high-level signal.
[0009] The output of the reset circuit is connected to the input of the MOS driver chip, enabling and disabling the output of the MOS driver chip.
[0010] Furthermore, the reset circuit is implemented by a low-side output reset chip.
[0011] Furthermore, the domain-controlled automatic circuit breaker circuit also includes an RC delay circuit, which is connected in series between the output terminal of the reset circuit and the input terminal of the MOS driver chip.
[0012] Furthermore, the RC delay circuit includes multiple parallel-connected chip capacitors.
[0013] Furthermore, the domain-controlled automatic circuit breaker circuit also includes an enable circuit, a first diode, and a second diode; the output terminal of the reset circuit is connected to the anode of the first diode, and the cathode of the first diode is connected to the input terminal of the RC delay circuit; the enable circuit includes a control terminal and a second resistor voltage divider circuit, the control terminal is connected to the input terminal of the second resistor voltage divider circuit, the output terminal of the second resistor voltage divider circuit is connected to the anode of the second diode, and the cathode of the second diode is connected to the input terminal of the RC delay circuit.
[0014] Furthermore, the first diode and the second diode are two diode units of a common cathode diode.
[0015] Furthermore, a first fuse is also included between the control terminal and the second resistor voltage divider circuit.
[0016] Furthermore, the MOS driver chip is a high-side driven MOS chip.
[0017] Furthermore, the output terminal of the MOS driver chip is grounded through a transient voltage suppression device.
[0018] This utility model achieves the following technical effects:
[0019] This domain-controlled automatic circuit breaker is a pure hardware design. The product's stability is more reliable than a hardware-software combined solution. It is not limited by program control and will not cause invalid shutdown due to system crashes.
[0020] The circuit is simple, consumes little power, and has a smaller overall design size. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the domain-controlled automatic circuit breaker of this utility model.
[0022] Figure 2 This is a circuit diagram of an embodiment of the domain-controlled automatic circuit breaking circuit of this utility model. Detailed Implementation
[0023] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.
[0024] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.
[0025] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.
[0026] Example 1:
[0027] like Figure 1 As shown, this utility model provides a schematic diagram of a domain-controlled automatic circuit breaker. This domain-controlled automatic circuit breaker consists of a reset chip U1, a MOS driver chip U2, and resistors R1 and R2, and includes leads such as a power input terminal, a control terminal, a drive output terminal, and a ground terminal. In this embodiment, the input voltage of the reset chip U1 is typically 3.3V or 5V, and the power supply voltage of the MOS driver chip U2 is 12V or 24V, directly powered by the power supply. Resistors R1 and R2 form a voltage divider circuit. The power input terminal of the domain-controlled automatic circuit breaker is connected externally to the power supply, and internally connected to the input terminal of the reset chip U1 through the voltage divider circuit to power the reset chip U1. The output terminal of the reset chip U1 is connected to the input terminal of the MOS driver chip U2. The function of the reset chip U1 is to detect abnormal voltage. When the power supply voltage is abnormal, the reset chip U1 will continuously output a low level, shutting off the output of the MOS driver chip U2. The MOS driver chip U2 can use high-side MOS, such as the Infineon BTT series BTS7010 MOS driver chip, which can be used as a drive switch for high-power MOSFETs and IGBTs.
[0028] Preferably, the reset chip U1 is a low-side output reset chip, such as IMP809T, which automatically outputs a low-level reset signal when the input voltage is abnormal.
[0029] The reset chip U1 is a hysteresis chip. It outputs a low level when the voltage drops to a set value, such as V1, but the voltage must be higher than V1 + 0.3V for U1 to return to a high level. This prevents the MOS driver chip U2 from frequently switching at the set critical voltage, thus avoiding damage to downstream components.
[0030] Example 2:
[0031] like Figure 2As shown, this utility model provides an embodiment of a domain-controlled automatic circuit breaker for automotive applications. This domain-controlled automatic circuit breaker employs a separate design for the power input and control terminals, including leads such as a power input terminal, a control terminal, a drive output terminal, and a ground terminal. Specifically, the power input terminal is connected to the battery positive terminal B+, denoted as B+; the control terminal is connected to the ACC signal line, denoted as ACC; the ground terminal is connected to the reference ground, denoted as GND; and the drive output terminal is connected to downstream devices (such as high-power MOSFETs and IGBTs), denoted as OUT.
[0032] The power input terminal B+ is connected to the power input terminal VS of the MOS driver chip U2 via diode D2 and fuse F2, and is labeled as power signal B+2. In the branch circuit, the power signal B+2 passes sequentially through a voltage divider circuit composed of resistors R1 and R2, the reset circuit U1, and one diode of the common cathode diode D3. Then, it passes through an RC delay circuit composed of resistor R9 and capacitors C2, C3, and C4 before being sent to the input pin IN of the MOS driver chip U2.
[0033] In this embodiment, the control terminal ACC passes sequentially through fuse F1, a voltage divider circuit composed of resistors R3 and R4, resistor R5, another diode of the common cathode diode D3, and an RC delay circuit composed of resistor R9 and capacitors C2, C3, and C4 before being sent to the IN pin of the MOS driver chip U2. When the key is switched to the ACC position, the control terminal ACC is powered on, and a high-level signal is input to IN, causing the MOS driver chip U2 to activate and output the drive signal OUT. ACC is short for Adaptive Cruise Control, which is controlled by the car key and supplies power to components such as the car audio system.
[0034] In this embodiment, because an RC delay circuit is added to the control terminal of the MOS driver chip U2, the MOS driver chip U2 can remain in the on state and maintain its original output even during a short-term voltage drop. Its function is to prevent the reset chip from malfunctioning due to a low-level output caused by a voltage drop during vehicle startup. The RC delay allows the MOS driver chip U2 to continue outputting. In practical applications, the total required capacitance will be calculated based on the required delay duration, and the specifications and quantity of the capacitors will be selected accordingly.
[0035] In this embodiment, a transient voltage suppressor ZD1 (including two units, ZD1A and ZD1B) is also provided to provide overvoltage protection for the output of the MOS driver chip U2.
[0036] The domain-controlled automatic circuit breaker circuit in this embodiment adopts a pure hardware design without an MCU, is not limited by program control, and will not cause invalid shutdown due to system crash.
[0037] The beneficial effects of this domain-controlled automatic circuit breaker:
[0038] The domain-controlled automatic circuit disconnection circuit of this invention can be applied to automobiles and industrial products;
[0039] This design is a pure hardware design, and the product's stability is more reliable than a hardware and software combined solution.
[0040] The reset chip is a low-power product with power consumption in the microamp level. When the control terminal voltage is lower than the set voltage, the output of the MOS driver chip is turned off, which will not increase the standby power consumption.
[0041] The circuit is simple and the overall design is smaller.
[0042] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.
Claims
1. A domain-controlled automatic circuit breaker, characterized in that: It includes a power input terminal, a drive output terminal, and a ground terminal, as well as an undervoltage detection circuit and a MOS driver chip; The undervoltage detection circuit includes a first resistor voltage divider circuit and a reset circuit; The power input terminal is connected to the MOS driver chip to supply power to the MOS driver chip; and is also connected to the input terminal of the reset circuit through the first resistor voltage divider circuit. The reset circuit has hysteresis characteristics. When the input voltage is detected to be lower than the lower hysteresis threshold, it outputs a low-level signal, and when the input voltage is detected to be higher than the upper hysteresis threshold, it outputs a high-level signal. The output of the reset circuit is connected to the input of the MOS driver chip, enabling and disabling the output of the MOS driver chip.
2. The domain-controlled automatic circuit breaker as described in claim 1, characterized in that: The reset circuit is implemented by a low-side output reset chip.
3. The domain-controlled automatic circuit breaker as described in claim 2, characterized in that: The domain-controlled automatic circuit breaker circuit also includes an RC delay circuit, which is connected in series between the output of the reset circuit and the input of the MOS driver chip.
4. The domain-controlled automatic circuit breaker as described in claim 3, characterized in that: The RC delay circuit includes multiple parallel-connected chip capacitors.
5. The domain-controlled automatic circuit breaker as described in claim 3, characterized in that: The domain-controlled automatic circuit breaker circuit also includes an enable circuit, a first diode, and a second diode; the output terminal of the reset circuit is connected to the anode of the first diode, and the cathode of the first diode is connected to the input terminal of the RC delay circuit; the enable circuit includes a control terminal and a second resistor voltage divider circuit, the control terminal is connected to the input terminal of the second resistor voltage divider circuit, the output terminal of the second resistor voltage divider circuit is connected to the anode of the second diode, and the cathode of the second diode is connected to the input terminal of the RC delay circuit.
6. The domain-controlled automatic circuit breaker as described in claim 5, characterized in that: The first diode and the second diode are two diode units of a common cathode diode.
7. The domain-controlled automatic circuit breaker as described in claim 5, characterized in that: A first fuse is also included between the control terminal and the second resistor voltage divider circuit.
8. The domain-controlled automatic circuit breaker as described in claim 1, characterized in that: The MOS driver chip is a high-side driven MOS chip.
9. The domain-controlled automatic circuit breaker as described in claim 1, characterized in that: The output terminal of the MOS driver chip is grounded through a transient voltage suppression device.