Heating control device for helicopter windshield glass

Abstract

The utility model discloses a heating control device for helicopter windshield glass. The heating control device comprises a power supply circuit, a temperature acquisition circuit, a single chip microcomputer, a failure signal acquisition circuit and a heating circuit, wherein the temperature acquisition circuit, the single chip microcomputer, the failure signal acquisition circuit and the heating circuit are electrically connected with the power supply circuit; the power supply circuit is connected with a direct-current power supply on the helicopter and converts the direct-current power supply on the helicopter into working voltage of each circuit at the rear end; the single-chip microcomputer is further electrically connected with the temperature acquisition circuit, the failure signal acquisition circuit and the heating circuit. The heating circuit is used for connecting an onboard alternating current power supply to a heating component of the windshield glass, and a platinum thermal resistor arranged in the windshield glass is connected to the temperature acquisition circuit; the single-chip microcomputer collects the voltage at the two ends of the platinum thermal resistor in the windshield through the temperature collection circuit so as to obtain the temperature of the windshield, and the windshield is heated through the heating circuit. According to the technical scheme, the requirements that the helicopter windshield glass is heated at a certain speed and is stabilized within a corresponding temperature range are met.

Description

Technical Field

[0001] The utility model relates to, but is not limited to, the technical field of helicopters, and particularly refers to a heating control device for a helicopter windshield. Background Art

[0002] As an important part of the helicopter airframe structure, the windshield not only has the function of windshading, but also needs to have functions such as anti-fogging and anti-icing to ensure a clear view and flight safety during flight.

[0003] In order to enable the helicopter windshield to have functions such as anti-fogging and anti-icing, it is necessary to control the heating of the windshield. Summary of the Utility Model

[0004] Objective of the utility model: To solve the above technical problems, embodiments of the utility model provide a heating control device for a helicopter windshield to achieve heating control of the helicopter windshield and keep it stable within a corresponding temperature range.

[0005] Technical solution of the utility model: Embodiments of the utility model provide a heating control device for a helicopter windshield, including: a power supply circuit, and a temperature acquisition circuit, a single-chip microcomputer, a failure signal acquisition circuit, and a heating circuit respectively connected to the power supply circuit;

[0006] Among them, the power supply circuit is connected to the DC power supply on the helicopter and is used to convert the on-board DC power supply into the working voltage of each subsequent circuit;

[0007] The single-chip microcomputer is also electrically connected to the temperature acquisition circuit, the failure signal acquisition circuit, and the heating circuit respectively; the heating circuit is used to connect the on-board AC power supply to the heating components of the windshield, and the platinum thermal resistance built in the windshield is connected to the temperature acquisition circuit;

[0008] The main engine of the electromechanical system on the helicopter is connected to the single-chip microcomputer through the failure signal acquisition circuit. The main engine sends a status signal for indicating the working state of the on-board power supply system, and the status signal is converted by the failure signal acquisition circuit and then transmitted to the single-chip microcomputer, so that the heating control device executes heating of the windshield when the status signal indicates normal;

[0009] The single-chip microcomputer is used to collect the voltage across the platinum thermal resistance in the windshield through the temperature acquisition circuit to obtain the temperature of the windshield, and the heating circuit heats the windshield.

[0010] Optionally, in the heating control device for a helicopter windshield as described above, the power supply circuit includes: a power supply module, and a surge suppression module connected between the DC current on the helicopter and the power supply module;

[0011] The surge suppression module is used to eliminate the surge voltage and spike voltage on the aircraft to provide a stable 28V voltage for the subsequent circuits.

[0012] The power supply module is used to convert the 28V voltage into 3.3V and 5V operating voltages required for each circuit in the heating control device.

[0013] Optionally, in the heating control device for a helicopter windshield as described above, the temperature acquisition circuit includes a constant current source circuit and a signal amplification circuit connected electrically, and both ends of the PT1000 platinum thermal resistor built into the windshield are connected between the constant current source circuit and the signal amplification circuit.

[0014] Among them, the current generated by the constant current source circuit passes through the PT1000 platinum thermal resistor, and the signal amplification circuit amplifies the voltage across both ends of the PT1000 platinum thermal resistor, so that the single-chip microcomputer can collect the voltage across both ends of the PT1000 platinum thermal resistor amplified by the signal amplification circuit, obtain the resistance value of the PT1000 platinum thermal resistor, and thus obtain the temperature of the windshield.

[0015] Optionally, in the heating control device for a helicopter windshield as described above, the heating circuit includes a relay and a heating control module connected electrically, and the single-chip microcomputer is electrically connected to the relay and the heating control module respectively.

[0016] The on-board AC power supply is connected to the relay of the heating circuit through a connector, and the three-phase alternating current is output to the heating components of the windshield through the relay and the heating control module.

[0017] Among them, the heating control module includes an optocoupler circuit with a zero-crossing detection function and a thyristor circuit; the single-chip microcomputer controls the on and off of the relay and the optocoupler circuit, and adjusts the on-off ratio of the thyristor circuit, so as to stabilize the heating rate of the windshield.

[0018] Optionally, in the heating control device for a helicopter windshield as described above, it further includes an alarm circuit connected to the power supply circuit, the single-chip microcomputer and the electrical system host respectively.

[0019] When a fault occurs in the internal circuit of the heating control device, the heating control device outputs a switch quantity ground signal to the host through the alarm circuit, lights up the alarm indicator of the alarm circuit, and the single-chip microcomputer outputs a low level to the relay to cut off the current from the relay to the windshield.

[0020] Optionally, in the heating control device for a helicopter windshield as described above, it further includes a current sensor connected to the rear end of the relay.

[0021] The current sensor is also connected to the power supply circuit and the single-chip microcomputer respectively, and is used to monitor the magnitude of the current transmitted to the windshield in real time, so that when the current is greater than the preset threshold, the single-chip microcomputer cuts off the relay, thereby cutting off the current output to the windshield.

[0022] Optionally, in the heating control device for a helicopter windshield as described above, the helicopter windshield has a defogging working state and an anti-icing working state; the device further includes: a working mode switching circuit respectively connected to the power supply circuit, the single-chip microcomputer and the electrical system host;

[0023] The host sends a status signal to the single-chip microcomputer through the working mode switching circuit, so that the single-chip microcomputer realizes heating of the windshield according to the heating requirements of the working state indicated by the status signal.

[0024] Advantages of the present utility model: The heating control device for a helicopter windshield provided by the embodiments of the present utility model includes: a power supply circuit, and a temperature acquisition circuit, a single-chip microcomputer, a failure signal acquisition circuit, and a heating circuit respectively connected to the power supply circuit; the DC power supply on the helicopter is converted into the working power supply of each circuit in the device through the power supply circuit, and the voltage value of the platinum thermal resistance on the windshield is acquired through the temperature acquisition circuit to obtain the temperature of the windshield, so as to adjust the heating power in real time through the heating circuit, achieve the purpose of stable temperature rise and accurate temperature adjustment, and realize the heating requirement of heating the helicopter windshield at a certain rate and stabilizing it within the corresponding temperature range. In addition, in the heating control device provided by the present utility model, by setting circuits such as a failure signal acquisition circuit and an alarm circuit, it has characteristics such as rapid fault location and fault isolation, and the product of this heating control device is light in weight and high in reliability. Description of the Drawings

[0025] The drawings are used to provide a further understanding of the technical solutions of the present utility model, and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solutions of the present utility model, and do not constitute a limitation to the technical solutions of the present utility model.

[0026] Figure 1 It is a structural schematic diagram of a heating control device for a helicopter windshield provided by an embodiment of the present utility model. Detailed Embodiments

[0027] To make the purpose, technical solutions and advantages of the present utility model clearer and more understandable, the embodiments of the present utility model will be described in detail below with reference to the drawings. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other arbitrarily.

[0028] As described in the above background art, based on the functional requirements of helicopter windshield glass for anti-fogging, anti-icing, etc., the embodiments of the present invention provide a heating control device for helicopter windshield glass, which is mainly used to heat the helicopter windshield glass at a certain rate and keep it stable within a corresponding temperature range.

[0029] The present invention provides the following specific embodiments that can be combined with each other. For the same or similar concepts or processes, they may not be described in some embodiments.

[0030] Figure 1 It is a schematic structural diagram of a heating control device for helicopter windshield glass provided by an embodiment of the present invention. As Figure 1 shown, the heating control device for helicopter windshield glass provided by the embodiments of the present invention includes: a power supply circuit, a temperature acquisition circuit, a single-chip microcomputer (such as an MCU chip), a failure signal acquisition circuit, and a heating circuit.

[0031] In the structure of the heating control device for helicopter windshield glass provided by the embodiments of the present invention, the power supply circuit is electrically connected to the temperature acquisition circuit, the single-chip microcomputer, the failure signal acquisition circuit, and the heating circuit respectively (the connection relationship of the power supply circuit in the heating control device is not shown in the figure), and the power supply circuit is also connected to the on-board DC power supply, and is used to convert the on-board DC power supply into the working power supply of each circuit device at the back end, such as converting it into 3.3V and 5V voltages.

[0032] The single-chip microcomputer in the embodiments of the present invention is also electrically connected to the temperature acquisition circuit, the failure signal acquisition circuit, and the heating circuit respectively; the heating circuit is used to connect the on-board AC power supply to the heating components of the windshield glass, and the platinum thermal resistor built in the windshield glass is connected to the temperature acquisition circuit.

[0033] The host of the electromechanical system on the helicopter is connected to the single-chip microcomputer through the failure signal acquisition circuit. The host sends a status signal for indicating the working state of the on-board power supply system, and after converting the status signal through the failure signal acquisition circuit, it is transmitted to the single-chip microcomputer, so that when the status signal indicates normal, the heating control device executes the heating of the windshield glass;

[0034] In the embodiments of the present invention, the single-chip microcomputer is used to collect the voltage across the platinum thermal resistor in the windshield glass through the temperature acquisition circuit to obtain the temperature of the windshield glass, and the heating circuit heats the windshield glass.

[0035] In an implementation manner of the embodiments of the present invention, as Figure 1 shown, the power supply circuit includes: a power supply module, and a surge suppression module connected between the on-board DC current of the helicopter and the power supply module.

[0036] Among them, the surge suppression module is used to eliminate the surge voltage and spike voltage on the aircraft to provide a stable 28V voltage for the subsequent circuit.

[0037] The power module is used to convert the 28V voltage into 3.3V and 5V working voltages required for each subsequent circuit in the heating control device.

[0038] In one implementation manner of the embodiment of the present utility model, as Figure 1 shown, the temperature acquisition circuit includes a constant current source circuit and a signal amplification circuit that are electrically connected, and both ends of the PT1000 platinum thermal resistor built in the windshield are connected between the constant current source circuit and the signal amplification circuit.

[0039] Among them, the current generated by the constant current source circuit passes through the PT1000 platinum thermal resistor, and the signal amplification circuit amplifies the voltage at both ends of the PT1000 platinum thermal resistor, so that the single-chip microcomputer acquires the voltage at both ends of the PT1000 platinum thermal resistor amplified by the signal amplification circuit, obtains the resistance value of the PT1000 platinum thermal resistor, and thus obtains the temperature of the windshield.

[0040] In one implementation manner of the embodiment of the present utility model, as Figure 1 shown, the heating circuit includes a relay and a heating control module that are electrically connected, and the single-chip microcomputer is electrically connected to the relay and the heating control module respectively.

[0041] The on-board AC power supply is connected to the relay of the heating circuit through a connector, and the three-phase alternating current is output to the heating element of the windshield through the relay and the heating control module.

[0042] Among them, the heating control module includes a photoelectric coupler circuit with a zero-crossing detection function and a thyristor circuit; the single-chip microcomputer controls the on-off of the relay and the photoelectric coupler circuit, and adjusts the on-off ratio of the thyristor circuit, so as to realize the stability of the heating rate of the windshield.

[0043] In specific implementation, a relay drive circuit, such as an electric coupling circuit, may also be connected between the single-chip microcomputer and the relay.

[0044] It should be noted that in the embodiment of the present utility model, the connection form of each circuit module and the cooperation working form of the circuit in the heating control device for the helicopter windshield are protected, and the specific control logic of the single-chip microcomputer is not protected; adopting the circuit form provided by the embodiment of the present utility model and cooperating with the control logic of the required rules can realize the heating control of the windshield.

[0045] In the heating control device provided by the embodiment of the present utility model, there is also included: an alarm circuit respectively connected to the power supply circuit, the single-chip microcomputer and the electrical system host, as Figure 1 shown.

[0046] In the embodiment of the present utility model, the heating control device adopts this warning circuit. When a fault occurs in the internal circuit of the device, the warning circuit can output a switch quantity grounding signal to the host, light up the warning indicator of the warning circuit, and the single-chip microcomputer outputs a low level to the relay to cut off the current from the relay to the windshield.

[0047] In the heating control device provided by the embodiment of the present utility model, it further includes: a current sensor connected to the rear end of the relay, as Figure 1 shown.

[0048] In the embodiment of the present utility model, the current sensor is also respectively connected to the power supply circuit and the single-chip microcomputer, and can monitor the magnitude of the current transmitted to the windshield in real time. When the current is greater than the preset threshold, the single-chip microcomputer cuts off the relay, thereby cutting off the current output to the windshield to achieve overcurrent protection for the windshield.

[0049] In practical applications, the helicopter windshield has a defogging working state and an anti-icing working state. Correspondingly, in the heating control device provided by the embodiment of the present utility model, a working mode switching circuit is respectively connected to the power supply circuit, the single-chip microcomputer, and the electrical system host.

[0050] The host sends a status signal to the single-chip microcomputer through the working mode switching circuit, so that the single-chip microcomputer heats the windshield according to the heating requirements of the working state indicated by the status signal, thereby realizing heating in the two working states of defogging and anti-icing.

[0051] Based on the functional requirements of the helicopter windshield for preventing fogging, preventing icing, etc., the embodiment of the present utility model provides a heating control device for a helicopter windshield, including: a power supply circuit, and a temperature acquisition circuit, a single-chip microcomputer, a failure signal acquisition circuit, and a heating circuit respectively connected to the power supply circuit; the DC power supply on the helicopter is converted into the working power supply of each circuit in the device through the power supply circuit, and the voltage value of the platinum thermal resistance on the windshield is acquired through the temperature acquisition circuit to obtain the temperature of the windshield, so as to adjust the heating power in real time through the heating circuit, achieve the purpose of stable temperature rise and accurate temperature adjustment, and realize the heating requirement of heating the helicopter windshield at a certain rate and stabilizing it within the corresponding temperature range. In addition, in the heating control device provided by the present utility model, by setting circuits such as a failure signal acquisition circuit and a warning circuit, it has characteristics such as rapid fault location and fault isolation, and the product of this heating control device has a light weight and high reliability.

[0052] The implementation manner of the heating control device for a helicopter windshield provided by the present utility model is schematically described below through a specific embodiment.

[0053] Refer to Figure 1As shown in the figure, the heating control device for a helicopter windshield provided by the present utility model includes a power supply circuit (including a power supply module and an overvoltage surge suppression module), a temperature acquisition circuit, a single-chip microcomputer (such as an MCU chip), a failure signal acquisition circuit, an alarm circuit, a current sensor, and a heating circuit (including a heating control module and a relay).

[0054] In an embodiment of the present utility model, the heating control device is, for example, a heating control box for a windshield. A drive board and a control board are provided in the heating control box. Among them, the heating circuit is on the drive board, and other circuits are on the control board. The power supply circuit is electrically connected to the temperature acquisition circuit, the single-chip microcomputer, the failure signal acquisition circuit, the alarm circuit, the heating circuit, the current sensor, and the working mode switching circuit respectively; the single-chip microcomputer is electrically connected to the temperature acquisition circuit, the failure signal acquisition circuit, the alarm circuit, the relay and the heating control module in the heating circuit, the current sensor, and the working mode switching circuit respectively.

[0055] The following describes the various functions of the heating control device for a helicopter windshield provided by the present utility model, as well as the functional modules and circuits for realizing the corresponding functions:

[0056] 1) Power supply processing function:

[0057] The modules for realizing the power supply processing function include a power supply module and a surge suppression module. The two 28V DC power supplies provided on the helicopter first pass through the voltage surge suppression module, which is used to eliminate unstable voltages such as surge voltages and spike voltages on the aircraft and provide a pure and stable 28V voltage for the subsequent electrical equipment. Then, the 28V voltage is converted into 3.3V and 5V voltages required by the electrical equipment through the power supply module, thus realizing power supply processing.

[0058] 2) Temperature acquisition function:

[0059] The temperature acquisition circuit consists of a constant current source circuit and a signal amplification circuit. The two ends of the PT1000 platinum thermal resistor built into the windshield are connected to the temperature acquisition circuit. After the current generated by the constant current source circuit passes through the PT1000 platinum thermal resistor, the signal amplification circuit amplifies the voltage across the PT1000 platinum thermal resistor, and the single-chip microcomputer acquires this amplified voltage, so as to calculate the resistance value of the PT1000 platinum thermal resistor built into the windshield, and thus obtain the temperature of the windshield.

[0060] 3) Failure signal acquisition function:

[0061] The host of the electromechanical system sends a ground / open signal to indicate the working conditions of the two power supply systems. The signal is converted through the failure signal acquisition circuit (such as a photoelectric coupler circuit) into a signal that can be directly acquired by the single-chip microcomputer, so as to drive the single-chip microcomputer to make corresponding controls.

[0062] For example, a signal sent from the place of origin indicates a power system failure; a signal sent to indicate "on" indicates that the power system is normal; a signal representing the working state is collected by an optocoupler and output after optoelectronic conversion.

[0063] 4) Heating control function:

[0064] The heating circuit mainly consists of a relay and a heating control module. The external AC power supply is connected to the inside of the heating control device through a connector plug. After the AC power supply passes through the relay and the heating control module, it reaches the heating components of the windshield. The on / off of the relay is controlled by a single-chip microcomputer. The heating control module mainly consists of an optocoupler circuit with a zero-crossing detection function and a thyristor circuit. In order to achieve a steady increase in temperature at a certain rate, the single-chip microcomputer needs to control the on / off ratio of the thyristor circuit to achieve a stable heating rate, and at the same time, the temperature can also be stabilized within a certain temperature range.

[0065] 5) Alarm function:

[0066] When a fault occurs in the internal circuit of the heating control device, a fault signal is output, which is manifested as a switching quantity grounding signal output to the host. When a fault occurs in the temperature acquisition circuit or the heating circuit, the single-chip microcomputer outputs a low-level signal to close the micro solid relay to cut off the current from the relay to the windshield, and the single-chip microcomputer outputs a switching quantity grounding signal to the host.

[0067] 6) Overcurrent protection function:

[0068] When the total current of the heating control device is greater than a certain value, the power supply needs to be cut off to prevent situations such as arcing in the windshield electric heating film. For this reason, the current needs to be monitored in real time. During specific implementation, the current sensor at the back end of the relay monitors the magnitude of the current output to the windshield, and the single-chip microcomputer collects the voltage signal output by the current sensor and then calculates the current value.

[0069] 7) Working state switching function:

[0070] There are two working states for the helicopter windshield, "demisting" and "anti-icing". When the single-chip microcomputer collects a signal of one of these states, the single-chip microcomputer will heat the windshield according to different heating requirements for each state.

[0071] For example, the host indicates the above two working states by sending 28V / open circuit signals respectively. The heating requirements set under different working states are different and can be set according to the actual situation.

[0072] The heating control device for the helicopter windshield provided by the embodiment of the present utility model connects the connecting cable of the AC power supply on the helicopter to the connector of the windshield heating control device, that is, connects the AC power supply to the relay, and uses the DC power supply on the aircraft as the power supply for the operation of the entire device. Select the heating state according to the needs of helicopter use. After receiving the status signal, the windshield heating device will automatically heat the windshield.

[0073] Although the disclosed embodiments of the present utility model are as above, the content is only the embodiments adopted for facilitating the understanding of the present utility model and is not used to limit the present utility model. Any person skilled in the art within the scope of the present utility model can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed by the present utility model. However, the scope of patent protection of the present utility model shall still be subject to the scope defined by the appended claims.

Claims

1. A heating control device for a helicopter windshield, characterized in that, Comprising: A power supply circuit, a temperature acquisition circuit, a microcontroller, a failure signal acquisition circuit, and a heating circuit, which are respectively connected to the power supply circuit; Among them, the power supply circuit is connected to the DC power supply on the helicopter and is used to convert the on-board DC power supply into the operating voltage of each subsequent circuit; The microcontroller is also electrically connected to the temperature acquisition circuit, the failure signal acquisition circuit, and the heating circuit respectively; the heating circuit is used to connect the on-board AC power supply to the heating components of the windshield, and the platinum thermal resistance built into the windshield is connected to the temperature acquisition circuit; The host of the electromechanical system on the helicopter is connected to the microcontroller through the failure signal acquisition circuit. The host sends a status signal for indicating the working state of the on-board power supply system. After the status signal is converted by the failure signal acquisition circuit, it is transmitted to the microcontroller, so that when the status signal indicates normal, the microcontroller enables the heating control device to perform heating on the windshield; The microcontroller is used to collect the voltage across the platinum thermal resistance in the windshield through the temperature acquisition circuit to obtain the temperature of the windshield, and the heating circuit heats the windshield.

2. The heating control device for a helicopter windshield according to claim 1, characterized in that, The power supply circuit includes: a power supply module, and a surge suppression module connected between the DC current on the helicopter and the power supply module; The surge suppression module is used to eliminate the surge voltage and spike voltage on the aircraft to provide a stable 28V voltage for the subsequent circuits; The power supply module is used to convert the 28V voltage into 3.3V and 5V operating voltages required by each circuit in the heating control device.

3. The heating control device for a helicopter windshield according to claim 1, characterized in that, The temperature acquisition circuit includes a constant current source circuit and a signal amplification circuit that are electrically connected, and both ends of the PT1000 platinum thermal resistance built into the windshield are connected between the constant current source circuit and the signal amplification circuit; Among them, the current generated by the constant current source circuit passes through the PT1000 platinum thermal resistance, and the signal amplification circuit amplifies the voltage across the PT1000 platinum thermal resistance, so that the microcontroller collects the voltage across the PT1000 platinum thermal resistance amplified by the signal amplification circuit and obtains the resistance value of the PT1000 platinum thermal resistance, thereby obtaining the temperature of the windshield.

4. The heating control device for a helicopter windshield according to claim 3, characterized in that, The heating circuit includes a relay and a heating control module that are electrically connected, and the microcontroller is electrically connected to the relay and the heating control module respectively; The on-board AC power supply is connected to the relay of the heating circuit through a connector, and the three-phase alternating current is output to the heating components of the windshield through the relay and the heating control module; Among them, the heating control module includes an optocoupler circuit and a thyristor circuit with zero-crossing detection function; the microcontroller controls the on-off of the relay and the optocoupler circuit, and adjusts the on-off ratio of the thyristor circuit, thereby realizing the stability of the heating rate of the windshield.

5. The heating control device for a helicopter windshield according to any one of claims 1 to 4, characterized in that, Also including: An alarm circuit respectively connected to the power supply circuit, the microcontroller, and the electromechanical system host; The heating control device is used to output a switch quantity ground signal to the host through the alarm circuit when a fault occurs in the internal circuit of the device, turn on the alarm indicator of the alarm circuit, and the microcontroller outputs a low level to the relay to cut off the current from the relay to the windshield.

6. The heating control device for a helicopter windshield according to any one of claims 1 to 4, characterized in that, Also including: A current sensor connected to the rear end of the relay; The current sensor is also connected to the power supply circuit and the single-chip microcomputer respectively, and is used to monitor the magnitude of the current transmitted to the windshield in real time, so that when the current is greater than a preset threshold, the single-chip microcomputer cuts off the relay, thereby cutting off the current output to the windshield.

7. The heating control device for a helicopter windshield according to any one of claims 1 to 4, characterized in that, The helicopter windshield has a defogging working state and an anti-icing working state; the device further includes a working mode switching circuit that is respectively connected to the power supply circuit, the single-chip microcomputer and the electrical system host; The host sends a status signal to the single-chip microcomputer through the working mode switching circuit, so that the single-chip microcomputer heats the windshield according to the heating requirements of the working state indicated by the status signal.

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