Relay-driven D flip-flop holding circuit for EVTOL aircraft

Abstract

The utility model relates to a relay-driven D flip-flop holding circuit for an EVTOL aircraft, and the circuit comprises a D flip-flop, a D end and a CP end are respectively connected with an I / O port of an MCU, and a Q end is connected with an input end of a driving chip. The SET end of the driving chip is sequentially connected with a resistor R3 and a capacitor C1 and is connected to the DLL end, and the resistor R3 and the capacitor C1 are grounded; and one end of the relay driving coil is connected with the output end of the driving chip, and the other end is grounded and is used for providing a magnetic field of suction force. According to the application, the situation that the control signal of the contactor is disconnected due to the problems of running-away or interference and the like caused by software fault of the MCU module in the flight process of the aircraft is avoided, and the safety of the aircraft is not influenced any more.

Description

Technical Field

[0001] The present application relates to the field of circuit technology, and in particular to a relay-driven D-type flip-flop holding circuit for an EVTOL aircraft. Background Art

[0002] At present, MCU is often used to control the contactor of the main circuit on EVTOL (Electric Vertical Takeoff and Landing) electric aircraft (aircraft). Power loss during the flight of the aircraft is a serious failure. The current relay drive circuit directly controls the drive module through the controller MCU. When the software is unexpectedly disturbed or reset, the MCU's I / O port outputs a low level by default, causing the drive circuit to be unable to maintain and then causing the contactor of the aircraft to disconnect and lose power, causing huge impact and damage.

[0003] Therefore, there is an urgent need for a relay-driven D-type flip-flop holding circuit for EVTOL aircraft, which can keep the driving output at a high level through the latched state of the flip-flop when the I / O port outputs a low level due to a reset or software crash of the MCU. Utility Model Content

[0004] The purpose of this application is to address the above-mentioned problems existing in the prior art, and to provide a relay-driven D-type flip-flop holding circuit for EVTOL aircraft, the main purpose of which is to achieve the purpose of maintaining the closed driving signal of the MCU application layer through the D-type flip-flop. If the MCU fails due to reset or IO port failure, the trigger will no longer be affected by the sudden low IO of the MCU, and will not be reversed to affect the state of the relay itself (ensuring that the reset can also maintain the output control design).

[0005] In order to achieve the above application purpose, the present application adopts the following technical solution: a relay driven D flip-flop holding circuit for an EVTOL aircraft comprises:

[0006] D flip-flop, the D and CP terminals are connected to the I / O ports of the MCU respectively, and the Q terminal is connected to the input terminal of the driver chip;

[0007] The driver chip, the SET terminal is connected to the resistor R3 and the capacitor C1 in sequence and connected to the DLY terminal, and the resistor R3 and the capacitor C1 are grounded;

[0008] The relay drive coil has one end connected to the output end of the drive chip and the other end connected to the ground, so as to provide a magnetic field for attracting force.

[0009] Furthermore, the Q terminal of the D flip-flop is connected to the input terminal of the driving chip through a resistor.

[0010] Furthermore, the VCC terminal of the D flip-flop is connected to a 5V power supply, and the PAD terminal and VB terminal of the driver chip are both connected to a 12V power supply.

[0011] Furthermore, a diode D1 is connected to the GND terminal of the driving chip, an anode of the diode D1 is connected to the GND terminal, a cathode of the diode D1 is grounded, and a resistor R4 is connected in parallel to the diode D1.

[0012] Furthermore, the D flip-flop is one-way or two-way.

[0013] Furthermore, a GND terminal of each D flip-flop is grounded.

[0014] Compared with the prior art, this application has the following beneficial effects:

[0015] 1. The present application can enable the two input terminals (CP terminal and D terminal) of the D flip-flop through the IO port of the MCU of the relay control logic unit before the aircraft takes off, so that the D flip-flop can provide a latched closing signal to the HSD (High Side Driver) driver chip to ensure flight safety even if the I / O port of the MCU becomes a low level due to software reset failure / flying away / interference during the flight;

[0016] 2. In the prior art, when the software unexpectedly runs away, the software executes a reset or the IO port fails (such as an unexpected short to ground), which will cause the original MCU's I / O to be reset or output a low level, thereby causing the relay drive output to be disconnected (the current software has the possibility of reset due to various reasons, which will cause the controller to reset instantly, thereby causing the drive I / O signal to be reset or reset). However, the present application uses an intermediate latch mechanism. Even if the MCU's I / O port outputs a low level due to reset or short to ground, the trigger needs a delay signal to rise again before it will be disconnected. Therefore, the falling edge generated by the reset or short to ground will not cause the relay drive circuit to become a low level, thereby disconnecting the contactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a circuit diagram of this application. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0019] like Figure 1 As shown, the relay driving D flip-flop holding circuit for EVTOL aircraft includes:

[0020] D flip-flop, the D and CP terminals are connected to the I / O ports of the MCU (MCU is not shown in the figure), and the Q terminal is connected to the input terminal of the driver chip;

[0021] In this embodiment, the Q terminal of the D flip-flop is connected to the input terminal of the driver chip through a resistor, the VCC terminal of the D flip-flop is connected to a 5V power supply, and the GND terminal of the D flip-flop is grounded. Among them, the D flip-flop (D Flip-Flop) is a digital circuit element used to store binary data bits. In a D flip-flop, there are usually two main input terminals:

[0022] D terminal (Data terminal): This is the data input terminal. The D terminal receives a binary signal that determines the data value to be stored when the flip-flop is triggered. When the flip-flop is triggered by the edge of the clock signal (rising or falling), the input data at the D terminal is transferred to the storage unit.

[0023] CP (Clock or Clock Pulse): This is the clock input terminal. The CP terminal receives the clock signal, which determines when the flip-flop should perform the data storage operation. The flip-flop usually operates at the edge (rising or falling) of the clock signal. At the rising or falling edge, the data at the D terminal is transferred to the storage unit.

[0024] The VCC terminal is used to access the power supply, and the Q terminal is the data output terminal of the D flip-flop, which outputs the data latched by the D terminal.

[0025] This application can use a single relay or dual relay driver chip. Figure 1 The general dual driver chip and dual relay solution is shown in the figure. Figure 1 The D flip-flop U1 and D flip-flop U3 and the driving chip U2.

[0026] The HSD (High Side Driver) driver chip U2 responds to the high level of the trigger, the SET terminal is connected to the resistor R3 and the capacitor C1 in sequence and connected to the DLY terminal, and the resistor R3 and the capacitor C1 are grounded;

[0027] In this embodiment, the PAD and VB terminals of the driver chip are both connected to a 12V power supply, the GND terminal of the driver chip is connected to a diode D1, the anode of the diode D1 is connected to the GND terminal, the cathode is grounded, and a resistor R4 is connected in parallel to the diode D1.

[0028] Among them, the driver chip is an HSD driver chip unit that responds to the high level of the trigger, such as the model BV2HD070EFU-CE2, its SET terminal is the overcurrent limit value setting port, DLY is the overcurrent shielding time setting port, IN1 and IN2 are both input ports with internal pull-down resistors, GND is a pin, ST1 and ST2 are both diagnostic output ports, and the two OUT_1~OUT_4 are both output ports, each of which is connected to a relay coil, such as Figure 1 The relay 1 coil L1 and relay 2 coil L2 in the circuit are shown in Figure 1. The driver chip is not directly controlled by the MCU, but the coil drive circuit is built by latching the high-side signal of the driver chip through a trigger.

[0029] The relay drive coil has one end connected to the output end of the drive chip U2 and the other end connected to the ground to provide a magnetic field for the attraction force. Figure 1 There are relay 1 coil L1 and relay 2 coil L2.

[0030] The parts not described in detail in this application are prior art, so this application does not describe them in detail.

[0031] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0032] Although this article uses more professional terms, it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of this application; interpreting them as any additional restrictions is contrary to the spirit of this application.

[0033] The present application is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of this application. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present application.

Claims

1. A relay driven D flip-flop holding circuit for EVTOL aircraft, characterized in that: include: D flip-flop, the D and CP terminals are connected to the I / O port of the driver respectively, and the Q terminal is connected to the input terminal of the driver chip; Driver chip, SET terminal is connected to resistor R3 and capacitor C1 in sequence and connected to DLY terminal, and ground is set between resistor R3 and capacitor C1, and output terminal is connected; The relay drive coil has one end connected to the output end of the drive chip and the other end connected to the ground, so as to provide a magnetic field for attracting force.

2. The relay driven D flip-flop holding circuit for EVTOL aircraft according to claim 1, characterized in that: The Q end of the D trigger is connected to the input end of the driving chip through a resistor.

3. The relay driven D flip-flop holding circuit for EVTOL aircraft according to claim 1, characterized in that: The VCC terminal of the D flip-flop is connected to a 5V power supply, and the PAD terminal and VB terminal of the driver chip are both connected to a 12V power supply.

4. The relay driven D flip-flop holding circuit for EVTOL aircraft according to claim 1, characterized in that: The GND terminal of the driving chip is connected to a diode D1 , the anode of the diode D1 is connected to the GND terminal, the cathode of the diode D1 is grounded, and a resistor R4 is connected in parallel to the diode D1 .

5. The relay driven D flip-flop holding circuit for an EVTOL aircraft according to any one of claims 1 to 4, characterized in that: The D flip-flop has one path or two paths.

6. The relay-driven D-type flip-flop holding circuit for an EVTOL aircraft according to claim 5, characterized in that: The GND terminal of each of the D flip-flops is grounded.

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