Override signal detection system for multi-channel solid-state power controllers with override function

Abstract

The present invention discloses an over-control signal detection system of a multi-channel solid-state power controller with an over-control function, comprising an over-control control main circuit and an over-control signal detection circuit, wherein the over-control control main circuit is composed of a multi-channel over-control control circuit, and the over-control control circuit is composed of a discrete quantity processing circuit, a solid-state power controller and an aircraft load. The over-control signal detection circuit is composed of a data selector, a discrete quantity acquisition module and a control processor. The beneficial effect of the present invention is that the over-control signal detection circuit does not affect the over-control signal detection circuit, and can perform fault downgrade processing according to the detection result, thereby improving the testability and reliability of the solid-state power controller.

Description

Technical Field

[0001] The present invention relates to self-detection of discrete override signals, and in particular to an override signal detection system of a multi-channel solid-state power controller with an override function. Background Art

[0002] With the advancement of aviation technology and power electronics technology, aircraft are gradually becoming more electrified and moving towards full electrification. Therefore, distributed solid-state power distribution systems have emerged. Solid-state power controllers are the core components of distributed solid-state power distribution systems. Their control methods can be controlled by bus commands or by hard-wired override signals. Once the bus and related processors fail, all loads of the entire power distribution device will be uncontrollable. Due to the limitations of bus control, solid-state power controllers controlled by hard-wired override signals are particularly suitable for aircraft critical loads. However, the traditional excitation method BIT method achieves self-checking by changing the output of the override signal, thereby affecting the output result of the solid-state power controller. It is not suitable for self-checking of control signals of solid-state power controllers with override functions. Summary of the invention

[0003] The object of the present invention is to solve the problems in the prior art and to provide a novel override signal detection system for a multi-channel solid-state power controller with an override function.

[0004] In order to achieve this purpose, the technical scheme of the present invention is as follows: an over-control signal detection system of a multi-channel solid-state power controller with an over-control function comprises an over-control control main circuit and an over-control signal detection circuit, wherein the over-control control main circuit is composed of a plurality of over-control control circuits, wherein the over-control control circuit is composed of a discrete quantity processing circuit, a solid-state power controller and an aircraft load, wherein each over-control control circuit corresponds to an over-control signal, wherein the discrete quantity processing circuit receives the over-control signal for discrete processing to output a main circuit over-control signal, wherein the solid-state power controller selectively supplies power to or cuts off power to the aircraft load according to the main circuit over-control signal from the discrete quantity processing circuit, wherein the over-control signal detection circuit is composed of a data selector, a discrete quantity acquisition module and a control processor, wherein the data selector receives the over-control signal and sends it to the discrete quantity acquisition module for discrete processing to output a detection circuit over-control signal, wherein the control processor compares the detection circuit over-control signal from the discrete quantity processing module and the main circuit control signal from the discrete quantity processing circuit to obtain self-test information, and wherein the solid-state power controller performs a downgrade process on the aircraft load according to the self-test information from the control processor.

[0005] As a preferred solution of the over-control signal detection system of a multi-channel solid-state power controller with an over-control function, the control processor and each of the solid-state power controllers have a common communication bus to enable the control processor and each of the solid-state power controllers to communicate with each other through the communication bus.

[0006] As a preferred solution of the override signal detection system of a multi-channel solid-state power controller with an override function, the communication bus is an SCI bus, a CAN bus or an RS485 bus.

[0007] As a preferred solution of the override signal detection system of a multi-channel solid-state power controller with an override function, an isolation circuit is provided between the control processor and each of the discrete quantity processing circuits.

[0008] As a preferred solution of the override signal detection system of a multi-channel solid-state power controller with an override function, the isolation circuit is resistor isolation or primary-secondary voltage isolation.

[0009] Compared with the prior art, the beneficial effects of the present invention are at least: the circuit structure is simple; the over-control signal detection circuit does not affect the over-control signal detection circuit, and fault degradation processing can be performed according to the detection result, thereby improving the testability and reliability of the solid-state power controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0011] The present invention is further described in detail below by means of specific embodiments connected with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0012] See also Figure 1 , shown in the figure is an over-control signal detection system of a multi-channel solid-state power controller with an over-control function, which is applicable to the over-control signal detection method of a multi-channel solid-state power controller. It does not affect the output of the solid-state power controller while performing self-detection of the over-control input signal. With the development of distributed power distribution, this method can be widely used in aircraft secondary power distribution systems.

[0013] The over-control signal detection system is composed of an over-control control main circuit and an over-control signal detection circuit.

[0014] In the super control main circuit: n super control input signals first enter the discrete quantity processing circuit, perform lightning protection processing on the super control input signals, and identify "connected to 28V", "grounded", and "open circuit". The super control signal after the discrete quantity processing circuit is connected to the solid-state power controller on the one hand to control the on-off control of the corresponding SSPC; on the other hand, it is connected to the processor after isolation and collected by the CPU, and the result is stored in the internal data register 1. The 0th bit of the register stores the collection result of the 1st bit super control signal, and so on.

[0015] In the over-control signal detection circuit: In order to save components and circuit board area, only one discrete quantity acquisition module is set, and n over-control signals enter the discrete quantity acquisition module in turn after passing through the data selector. The over-control signal is collected by the processor after processing, and the result is stored in the internal data register 2. The 0th bit of the register stores the collection result of the 1st bit over-control signal, and so on.

[0016] The process of super control signal detection is as follows: First, the processor CPU sends a "selector control signal" to select the first super control signal to enter the discrete quantity acquisition module. The processor reads the acquisition result and stores it in the 0th bit of data register 2; at the same time, the processor reads the super control signal state of the super control main loop, stores it in data register 1, and compares whether the 0th bit values ​​of data register 1 and data register 2 are consistent. If the values ​​are consistent, it means that the acquisition of the first super control signal is normal, otherwise it means that the acquisition of the first super control signal is abnormal. The detection methods of the remaining super control signals are the same as above. In order to avoid the jitter of discrete quantity input and the inconsistent acquisition results caused by the switching moment of discrete quantity input, it is solved by multiple acquisitions and judgments to enhance the credibility of the acquisition results.

[0017] Fault degradation processing strategy: The processor sends the fault detection result to each solid-state power controller through the communication bus. The solid-state power controller implements degradation processing according to the load level and connects or disconnects the current load.

[0018] An isolation circuit is set between the super control main circuit and the super control signal detection circuit, which can adopt resistance isolation or main-secondary voltage isolation, to ensure that the failure of the super control signal detection circuit will not affect the normal operation of the super control main circuit, reduce the influence of the signal detection circuit on the main circuit, and improve the reliability of the super control main circuit.

[0019] The above only expresses the implementation mode of the present invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. An override signal detection system for a multi-channel solid-state power controller with an override function, characterized in that: The invention comprises an over-control main loop and an over-control signal detection loop, wherein the over-control main loop is composed of multiple over-control control circuits, and the over-control control circuits are composed of a discrete quantity processing circuit, a solid-state power controller and an aircraft load, each of the over-control control circuits corresponds to an over-control signal, the discrete quantity processing circuit receives the over-control signal for discrete processing to output a main loop over-control signal, the solid-state power controller selectively supplies power to or cuts off power to the aircraft load according to the main loop over-control signal from the discrete quantity processing circuit, the over-control signal detection loop is composed of a data selector, a discrete quantity acquisition module and a control processor, the data selector receives the over-control signal and sends it to the discrete quantity acquisition module for discrete processing to output a detection loop over-control signal, the control processor compares the detection loop over-control signal from the discrete quantity processing module and the main loop control signal from the discrete quantity processing circuit to obtain self-test information, and the solid-state power controller performs a downgrade process on the aircraft load according to the self-test information from the control processor.

2. The override signal detection system of a multi-channel solid-state power controller with an override function according to claim 1, characterized in that: The control processor and each of the solid-state power controllers have a common communication bus, so that the control processor and each of the solid-state power controllers can communicate with each other through the communication bus.

3. The override signal detection system of a multi-channel solid-state power controller with an override function according to claim 2, characterized in that: The communication bus is an SCI bus, a CAN bus or an RS485 bus.

4. The override signal detection system of a multi-channel solid-state power controller with an override function according to claim 1, characterized in that: An isolation circuit is provided between the control processor and each discrete quantity processing circuit.

5. The override signal detection system of a multi-channel solid-state power controller with override function according to claim 4, characterized in that: The isolation circuit is resistor isolation or primary-secondary voltage isolation.

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