A power generation system control device with fault latching and reset functions

Abstract

The application belongs to the field of airborne power generation system, and particularly relates to a power generation system control device with fault latching and reset function. The control device is connected in series in the control circuit of the protected power generation system, the control circuit of the protected power generation system comprises an excitation control circuit in an airborne power generation system or a main contactor control circuit in the airborne power generation system, the control device comprises an overvoltage protection state fault latching and reset circuit, a power supply state fault latching and reset circuit, a control driving circuit and an action circuit. When it is judged that an overvoltage protection event or power supply abnormality occurs, the excitation relay is disconnected and the output main contactor driving disconnection command is sent, and the state is locked, so that the power generation system is disconnected from the busbar, when the reset signal instruction sent by the generator controller is received, the circuit will reset the excitation and main contactor control command, the excitation relay is closed and the output main contactor driving command is sent, so that the power generation system is connected to the busbar again.

Description

Technical Field

[0001] This application belongs to the field of airborne power generation systems, and specifically relates to a power generation system control device with fault latching and reset functions. Background Technology

[0002] Currently, when overvoltage occurs in airborne power generation systems under conditions such as sudden high-power load unloading or generator controller overexcitation, the generator controller's built-in excitation control and main contactor control software can only output excitation disconnection and main contactor disconnection signals. If the generator controller's built-in excitation control software and main contactor control software malfunction or fail, the excitation and main contactor will not be able to disconnect, meaning the power generation system cannot be disconnected from the grid, severely damaging the aircraft's electrical loads. Summary of the Invention

[0003] To address the aforementioned issues, this application provides a power generation system control device with fault latching and reset functions. The device incorporates excitation and main contactor control hardware circuitry to achieve backup control of the power generation system's excitation and main contactor, thereby improving system safety.

[0004] The power generation system control device with fault latching and reset functions provided in this application is connected in series in the control circuit of the protected power generation system. The control circuit of the protected power generation system includes the excitation control circuit in an aviation power generation system or the main contactor control circuit in an aviation power generation system. The control device includes:

[0005] The overvoltage protection state fault latching and reset circuit extends the discrete overvoltage protection signal of the control device through two NOT gates and outputs an overvoltage protection signal. When no overvoltage protection event occurs, the output overvoltage protection signal is high level. A first in-phase buffer is set between the two NOT gates. A first reset branch is also set at the input terminal of the first in-phase buffer. When the input reset signal is valid, the first reset branch pulls the input terminal of the first in-phase buffer low level.

[0006] The power supply status fault latching and reset circuit continues the discrete power supply status signal of the control device through two NOT gates and outputs a power supply status signal. When the power supply status is normal, the output power supply status signal is high level. A second non-inverting buffer is set between the two NOT gates. A second reset branch is also set at the input terminal of the second non-inverting buffer. When the input reset signal is valid, the second reset branch pulls the input terminal of the second non-inverting buffer low level.

[0007] The control drive circuit uses an AND gate to form a control command signal from the overvoltage protection signal, the power supply status signal, and the test result signal.

[0008] An operating circuit is used to generate feedback information based on the control command signal and send the feedback information to the generator controller and main contactor of the protected power generation system.

[0009] Preferably, the overvoltage protection state fault latching and reset circuit includes a first NOT gate N2:1 and a fourth NOT gate N2:4. After passing through the first NOT gate N2:1, an overvoltage fault latching signal is output. The overvoltage fault latching signal is divided into two branches. One branch is connected to the fourth NOT gate N2:4 via the first in-phase buffer N3:1, and the other branch is connected to the first reset branch via diode VD1. The first reset branch is equipped with a field-effect transistor VT1. When the reset command is valid, a high-level signal is introduced into the gate of the field-effect transistor VT1, so that the field-effect transistor VT1 is turned on, thereby pulling down the input level of the first in-phase buffer N3:1.

[0010] Preferably, the power supply fault latching and reset circuit includes a second NOT gate N2:2 and a third NOT gate N2:3. After passing through the second NOT gate N2:2, a power supply fault latching signal is output. The power supply fault latching signal is divided into two branches. One branch is connected to the third NOT gate N2:3 via the second in-phase buffer N3:2. The other branch is connected to the second reset branch via diode VD3. The second reset branch is equipped with a field-effect transistor VT2. When the reset command is valid, a high-level signal is introduced into the gate of the field-effect transistor VT2, which turns on the field-effect transistor VT2, thereby pulling down the input level of the second in-phase buffer N3:2.

[0011] Preferably, the control drive circuit includes a first AND gate N1:1 and a second AND gate N1:2. The test result signal and the power supply status signal are output through the first AND gate N1:1, and then output as a control command signal through the second AND gate N1:2 along with the overvoltage protection signal. When the control device is powered on and passes the test, the test result signal is set to a high level by default.

[0012] Preferably, the operating circuit includes an excitation signal transmission backup control circuit, which couples the relay K2 to the control command signal through a field-effect transistor V28. When the control command signal is high, the field-effect transistor V28 is turned on, the relay K2 is closed, and the generator excitation negative signal is output to the generator controller.

[0013] Preferably, the operating circuit includes a main contactor control circuit. The main contactor backup control circuit couples the main contactor drive signal and the control command signal through a P-channel MOSFET V19. When the control command signal is high, the P-channel MOSFET V19 is turned on. After the main contactor drive signal is filtered by a capacitor and suppressed by a transient voltage suppression diode, the final main contactor drive signal is output to the main contactor coil.

[0014] This application adopts a pure hardware design, forming an independent and dissimilar design with the generator controller software design. It can serve as a backup control and protection for the power generation system after the generator controller software loses its control and protection functions, ensuring the safety of the power generation system and the onboard electrical loads, and improving the safety and robustness of the aviation power generation system.

[0015] This application can effectively prevent damage to the power generation system and airborne electrical loads, thereby improving the safety of the aircraft's airborne power generation system and airborne electrical loads. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a preferred embodiment of the power generation system control device with fault latching and reset functions, connected in series in the excitation control circuit of the power generation system.

[0017] Figure 2 This is a schematic diagram of a preferred embodiment of the power generation system control device with fault latching and reset functions of this application, connected in series with the main contactor control circuit.

[0018] Figure 3 This is a schematic diagram of the fault latching and reset circuit for overvoltage protection.

[0019] Figure 4 This is a schematic diagram of a power supply fault latching and reset circuit.

[0020] Figure 5 This is a schematic diagram of the control drive circuit.

[0021] Figure 6 This is a schematic diagram of the operating circuit connected in series with the excitation control loop of the power generation system.

[0022] Figure 7 This is a schematic diagram of the operating circuit connected in series in the main contactor control circuit loop. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0024] This application provides a power generation system control device with fault latching and reset functions. The control device is connected in series in the control circuit of the protected power generation system. The control circuit of the protected power generation system includes the excitation control circuit in an aviation power generation system or the main contactor control circuit in an aviation power generation system.

[0025] First refer to Figure 1 In the absence of the control device provided in this application, the generator controller has an excitation control circuit. This excitation control circuit sends a positive excitation signal to the generator, causing the generator to operate, and also feeds back a negative excitation signal. The excitation control circuit receives control commands from the onboard generator controller software, thereby controlling the opening or closing of the excitation of the power generation system. This application connects the control device in series between the generator controller and the generator. This control device achieves excitation control of the power generation system based on overvoltage protection signals, power supply status signals, reset signals, etc. After an overvoltage protection event occurs in the power generation system, it ensures reliable excitation disconnection, protecting the safety of the power generation system and the onboard electrical loads.

[0026] Similarly, refer to Figure 2 When the protected power generation system is the main contactor control circuit loop of an aviation power generation system, the control device of this application is connected in series with the main contactor control circuit loop of the original aviation power generation system. The main contactor control is achieved by utilizing the series operation of two sets of main contactor control circuits. After an overvoltage protection event occurs in the power generation system, the main contactor is ensured to receive the drive disconnect signal, realizing the protection disconnection function of the main contactor within the power generation system and protecting the safety of the airborne electrical load.

[0027] The power generation system control device with fault latching and reset functions of this application mainly includes an overvoltage protection state fault latching and reset circuit, a power supply state fault latching and reset circuit, a control drive circuit, and an action circuit. The overvoltage protection state fault latching and reset circuit mainly outputs an overvoltage protection state signal. When no overvoltage protection has occurred, it normally outputs a high-level signal; otherwise, it outputs a low-level signal. When the output is low, it can be further changed to a high level by a reset signal. The power supply state fault latching and reset circuit works on the same principle as the overvoltage protection state fault latching and reset circuit, outputting a high level when the power supply is normal. The control drive circuit uses an AND gate to output the above two signals and the test result signal. All three are necessary conditions for the control device to operate. When all are high, it outputs a high-level control command signal, which is finally driven by the action circuit to drive the protected power generation system to participate in or stop operation. The following provides a detailed description of the power generation system control device with fault latching and reset functions of this application.

[0028] (1) Overvoltage protection state fault latching and reset circuit, the overvoltage protection discrete signal of the control device is continued through two NOT gates to output the overvoltage protection signal. When no overvoltage protection event occurs, the output overvoltage protection signal is high level. A first in-phase buffer is set between the two NOT gates. A first reset branch is also set at the input terminal of the first in-phase buffer. When the input reset signal is valid, the first reset branch pulls the input terminal of the first in-phase buffer low to the low level.

[0029] In some alternative implementations, such as Figure 3 As shown, the overvoltage protection state fault latching and reset circuit includes a first NOT gate N2:1 and a fourth NOT gate N2:4. After passing through the first NOT gate N2:1, an overvoltage fault latching signal is output. The overvoltage fault latching signal is divided into two branches. One branch is connected to the fourth NOT gate N2:4 through the first in-phase buffer N3:1, and the other branch is connected to the first reset branch through the diode VD1. The first reset branch is equipped with a field-effect transistor VT1. When the reset command is valid, a high-level signal is introduced into the gate of the field-effect transistor VT1, so that the field-effect transistor VT1 is turned on, thereby pulling down the input level of the first in-phase buffer N3:1.

[0030] refer to Figure 3The input consists of an overvoltage protection status discrete signal OVP and a reset signal Reset. The reset signal Reset is the same signal as the reset signal Reset in the power supply status fault latching and reset circuit. The overvoltage protection status discrete signal OVP is a high-low level signal. A high level indicates that no overvoltage protection event has occurred in the system, and a low level indicates that an overvoltage protection event has occurred in the system. After passing through the fault latching and reset circuit composed of resistor R5, NOT gate N2:1, resistor R6, capacitor C3, diode VD1, resistor R4, MOSFET VT1, diode VD2, non-inverting buffer N3:1, NOT gate N2:4, and resistor R7, the output is the overvoltage protection status signal OVP_STS_CON, which participates in the control of the protected device (excitation and main contactor). This signal is a high-low level signal. A high level indicates that no overvoltage protection event has occurred, and a low level indicates that an overvoltage protection event has occurred in the system. When the power generation system is working normally, the reset command Reset is a low-level signal and is in an invalid state, while OVP is a high-level signal. At this time, VT1 is in the open state. The level of the + terminal of C3 and the input terminal of pin 7 of N3:1 is determined by OVP. OVP outputs a low-level signal through R5, N2:1, R6, and C3. After passing through N3:1, it continues to output a low-level signal. Then, through N2:4 and R7, it outputs a high-level signal, OVP_STS_CON. The absence of an overvoltage protection event is one of the necessary conditions for the control device (excitation and main contactor) to close. When an overvoltage protection event occurs, OVP is a low-level signal, and the + terminal of C3 and the 7th pin of N3:1 will remain high. At this time, OVP_STS_CON is a low-level signal, performing overvoltage fault latching until the reset command Reset is a high-level signal and is in an active state. Reset can be output to the gate of VT1 through R4, VT1 conducts, resetting the + terminal of C3 and the 7th pin of N3:1 and pulling them low. This low level continues to be output as a low-level signal after passing through N3:1, and then after passing through N2:4 and R7, OVP_STS_CON is output as a high-level signal, resetting the overvoltage fault and setting the overvoltage protection status signal OVP_STS_CON, which is involved in the control of the control device (excitation and main contactor), to high.

[0031] (2) Power supply status fault latching and reset circuit, which continues the discrete power supply status signal of the control device through two NOT gates and outputs the power supply status signal. When the power supply status is normal, the output power supply status signal is high level. A second in-phase buffer is set between the two NOT gates. A second reset branch is also set at the input terminal of the second in-phase buffer. When the input reset signal is valid, the second reset branch pulls the input terminal of the second in-phase buffer low level.

[0032] In some alternative implementations, such as Figure 4As shown, the power supply status fault latching and reset circuit includes a second NOT gate N2:2 and a third NOT gate N2:3. After passing through the second NOT gate N2:2, a power supply fault latching signal is output. The power supply fault latching signal is divided into two branches. One branch is connected to the third NOT gate N2:3 via the second in-phase buffer N3:2. The other branch is connected to the second reset branch via diode VD3. The second reset branch is equipped with a field-effect transistor VT2. When the reset command is valid, a high-level signal is introduced into the gate of the field-effect transistor VT2, which turns on the field-effect transistor VT2, thereby pulling down the input level of the second in-phase buffer N3:2.

[0033] refer to Figure 4The input consists of a discrete power supply status signal Power_STS and a reset signal Reset. The discrete power supply status signal Power_STS is a high-low level signal, with a high level indicating normal power supply and a low level indicating abnormal power supply. The reset signal Reset is a high-low level signal, with a high level indicating a valid reset command and a low level indicating an invalid reset command. These two signals pass through a fault latching and reset circuit composed of NOT gates N2:2, resistor R9, capacitor C5, diode VD3, resistor R8, MOSFET VT2, diode VD4, non-inverting buffer N3:2, NOT gate N2:3, and resistor R10. The output is the power supply status signal Power_STS_CON, which participates in the control of the control device (excitation and main contactor). This signal is a high-low level signal, with a high level indicating normal power supply and a low level indicating abnormal power supply. When the power generation system is working normally, the reset command Reset is a low-level signal and is in an invalid state, while Power_STS is a high-level signal. At this time, VT2 is in the open state. The level of the + terminal of C5 and the input terminal of N3:2 pin 3 is determined by Power_STS. Power_STS outputs a low level after passing through N2:2, then a low-level signal after passing through R9 and C5, and continues to output a low-level signal after passing through N3:2. Finally, Power_STS_CON is output as a high-level signal after passing through N2:3 and R10. This signal is one of the necessary conditions for the closing of the control device (excitation and main contactor) and is sent to the control drive circuit of the control device (excitation and main contactor). When the power supply is abnormal, i.e., Power_STS is a low-level signal, the + terminal of C5 and the input terminal 3 of N3:2 will remain high. At this time, Power_STS_CON is a low-level signal, performing power supply fault latching until the reset command Reset is a high-level signal and is in an active state. Reset can be output to the gate of VT2 through R8, VT2 conducts, resetting the + terminal of C5 and the input terminal 3 of N3:2 and pulling them low. This low level continues to be output as a low-level signal after passing through N3:2, and then after passing through N2:3 and R10, Power_STS_CON is output as a high-level signal, resetting the power supply fault. The power supply status signal Power_STS_CON, which participates in the control of the control device (excitation and main contactor), is set to a high-level signal and sent to the control device (excitation and main contactor) control drive circuit.

[0034] (3) The control drive circuit is formed by the overvoltage protection signal, the power supply status signal and the test result signal through an AND gate to form a control command signal.

[0035] In some alternative implementations, such as Figure 5As shown, the control drive circuit includes a first AND gate N1:1 and a second AND gate N1:2. The test result signal and the power supply status signal are output through the first AND gate N1:1, and then output as a control command signal through the second AND gate N1:2 along with the overvoltage protection signal. When the control device is powered on and passes the test, the test result signal is set to a high level by default.

[0036] refer to Figure 5 The inputs are the test result signal Test_STS_State, the power supply status signal Power_STS_CON (involved in the control of the excitation and main contactor), and the overvoltage protection status signal OVP_STS_CON (involved in the control of the excitation and main contactor). The test result signal Test_STS_State is a high-level signal; a high level indicates that the control device has passed the power-on operation test, and a low level indicates that the control device has failed the power-on operation test. This signal is high by default. After the above three signals pass through the logic circuit composed of resistor R10, AND gate N1:1, AND gate N1:2, and resistor R3, the output is the control command signal LC_GC_CON (involved in the control of the excitation and main contactor). This control command signal LC_GC_CON is a high-level signal; a high level indicates that the control device (excitation and main contactor) has closed, and a low level indicates that the control device (excitation and main contactor) has opened. This signal is sent to the control device (excitation and main contactor) operating circuit.

[0037] (4) Action circuit, used to generate feedback information based on the control command signal and send the feedback information to the generator controller and main contactor of the protected power generation system.

[0038] In some optional embodiments, the operating circuit includes an excitation signal transmission backup control circuit, which couples the relay K2 to the control command signal through a field-effect transistor V28. When the control command signal is high, the field-effect transistor V28 is turned on, the relay K2 is closed, and the generator excitation negative signal is output to the generator controller.

[0039] refer to Figure 6The input consists of the control command signal LC_GC_CON and the generator's output excitation negative signal "LC-". The control command signal LC_GC_CON passes through the excitation action circuit, which uses a PMOS transistor as its core drive amplifier and a field-effect transistor and relay as its core action execution circuit. It is then sent to the excitation execution circuit, composed of relay K2, diodes V26 and V27, field-effect transistor V28, and resistor R136, ultimately outputting the excitation negative signal to the generator controller. When the generator system is normal or has been reset, LC_GC_CON is a high-level signal, sent to the gate (G) of V28, making V28 conduct. The negative terminal -X2 of K2's coil is pulled low, and the positive terminal +X1 of K2's coil is powered by 28V. K2 is closed, and the generator excitation negative signal "LC-" is output through contact group A, i.e., LC_GCU is sent to the generator controller.

[0040] In some optional embodiments, the operating circuit includes a main contactor control circuit. The main contactor backup control circuit couples the main contactor drive signal and the control command signal through a P-channel MOSFET V19. When the control command signal is high, the P-channel MOSFET V19 is turned on. After the main contactor drive signal is filtered by a capacitor and suppressed by a transient voltage suppression diode, the final main contactor drive signal is output to the main contactor coil.

[0041] refer to Figure 7 The inputs are the control command signal LC_GC_CON and the main contactor control signal GC_Drive-GCU output from the generator controller. The control command signal LC_GC_CON is sent to the main contactor drive signal amplification circuit, which consists of resistor R95, transistor V20, resistor R93, resistor R88, Zener diode V18, PMOS transistor V19, diode D2, resistor R96, capacitor C40, diode D3, transient voltage suppression diode V22, and capacitor C39. Finally, the main contactor drive signal is output to the main contactor coil. When the power generation system is normal or reset, LC_GC_CON is a high-level signal, which is sent to terminals b and e of V20, and V20 is in the conducting state. Terminal G (terminal 1) of V19 is low-level, and GC_Drive-GCU is high-level. At this time, V19 is in the conducting state. GC_Drive-GCU is sent to the main contactor coil after passing through D2, R96, C40 for filtering, and D3 and D22 for preventing reverse output and suppressing transient voltage.

[0042] After the control device provided in this application passes the power-on operation test, in the absence of overvoltage protection events and power supply faults, the excitation and main contactor control circuit of the power generation system with fault latching and reset functions will close the excitation relay and output the main contactor drive command. At this time, the power generation system starts to connect to the grid, the busbar is connected to voltage, and the electrical load uses power normally. When an overvoltage protection event or power supply abnormality is detected, the circuit of this application will disconnect the excitation relay and output the main contactor drive disconnect command, and lock this state, causing the power generation system to disconnect from the busbar, with no voltage on the busbar and no power supply to the electrical load. When a valid reset signal command is received from the generator controller, the circuit of this application will reset the excitation and main contactor control commands, close the excitation relay and output the main contactor drive command, causing the power generation system to reconnect to the busbar, and the electrical load uses power normally.

[0043] Although this application has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, such modifications or improvements made without departing from the spirit of this application are all within the scope of protection claimed in this application.

Claims

1. A power generation system control device with fault latching and reset functions, characterized in that, The control device is connected in series in the control circuit of the protected power generation system, wherein the control circuit of the protected power generation system includes the excitation control circuit of an aviation power generation system or the main contactor control circuit of an aviation power generation system, and the control device includes: The overvoltage protection state fault latching and reset circuit extends the discrete overvoltage protection signal of the control device through two NOT gates and outputs an overvoltage protection signal. When no overvoltage protection event occurs, the output overvoltage protection signal is high level. A first in-phase buffer is set between the two NOT gates. A first reset branch is also set at the input terminal of the first in-phase buffer. When the input reset signal is valid, the first reset branch pulls the input terminal of the first in-phase buffer low level. The power supply status fault latching and reset circuit continues the discrete power supply status signal of the control device through two NOT gates and outputs a power supply status signal. When the power supply status is normal, the output power supply status signal is high level. A second non-inverting buffer is set between the two NOT gates. A second reset branch is also set at the input terminal of the second non-inverting buffer. When the input reset signal is valid, the second reset branch pulls the input terminal of the second non-inverting buffer low level. The control drive circuit uses an AND gate to form a control command signal from the overvoltage protection signal, the power supply status signal, and the test result signal. An operating circuit is used to generate feedback information based on the control command signal and send the feedback information to the generator controller and main contactor of the protected power generation system.

2. The power generation system control device with fault latching and reset functions as described in claim 1, characterized in that, The overvoltage protection state fault latching and reset circuit includes a first NOT gate N2:1 and a fourth NOT gate N2:

4. After passing through the first NOT gate N2:1, an overvoltage fault latching signal is output. The overvoltage fault latching signal is divided into two branches. One branch is connected to the fourth NOT gate N2:4 through the first in-phase buffer N3:1, and the other branch is connected to the first reset branch through the diode VD1. The first reset branch is equipped with a field-effect transistor VT1. When the reset command is valid, a high-level signal is introduced into the gate of the field-effect transistor VT1, so that the field-effect transistor VT1 is turned on, thereby pulling down the input level of the first in-phase buffer N3:

1.

3. The power generation system control device with fault latching and reset functions as described in claim 1, characterized in that, The power supply status fault latching and reset circuit includes a second NOT gate N2:2 and a third NOT gate N2:

3. After passing through the second NOT gate N2:2, a power supply fault latching signal is output. The power supply fault latching signal is divided into two branches. One branch is connected to the third NOT gate N2:3 via the second in-phase buffer N3:

2. The other branch is connected to the second reset branch via diode VD3. The second reset branch is equipped with a field-effect transistor VT2. When the reset command is valid, a high-level signal is introduced into the gate of the field-effect transistor VT2, which turns on the field-effect transistor VT2, thereby pulling down the input level of the second in-phase buffer N3:

2.

4. The power generation system control device with fault latching and reset functions as described in claim 1, characterized in that, The control drive circuit includes a first AND gate N1:1 and a second AND gate N1:

2. The test result signal and the power supply status signal are output through the first AND gate N1:1, and then the control command signal is output through the second AND gate N1:2 along with the overvoltage protection signal. When the control device is powered on and passes the test, the test result signal is set to a high level by default.

5. The power generation system control device with fault latching and reset functions as described in claim 1, characterized in that, The operating circuit includes an excitation signal transmission backup control circuit. The excitation signal transmission control circuit couples the relay K2 to the control command signal through a field-effect transistor V28. When the control command signal is high, the field-effect transistor V28 is turned on, the relay K2 is closed, and the generator excitation negative signal is output to the generator controller.

6. The power generation system control device with fault latching and reset functions as described in claim 1, characterized in that, The operating circuit includes a main contactor control circuit. The main contactor backup control circuit couples the main contactor drive signal and the control command signal through a P-channel MOSFET V19. When the control command signal is high, the P-channel MOSFET V19 is turned on. After the main contactor drive signal is filtered by a capacitor and suppressed by a transient voltage suppression diode, the final main contactor drive signal is output to the main contactor coil.

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