Heating control circuit and heating control method

Abstract

The invention provides a heating control circuit and a heating control method. The heating control circuit comprises a manual heating control circuit, an automatic heating control circuit and a heating current detection circuit, the manual heating control circuit and the automatic heating control circuit are both connected with the heating current detection circuit; the manual heating control circuit is used for acquiring a manual heating switch signal of the airplane and judging whether to output a heating voltage or not according to the manual heating switch signal; the automatic heating control circuit is used for receiving a heating control signal output by the microprocessor and judging whether to output a heating voltage according to the heating control signal; and the heating current detection circuit is used for detecting heating current, transmitting a heating detection signal generated by detection to the voltage acquisition circuit at the rear end, and judging whether the heating control circuit works normally or not through the heating current detection circuit and the voltage acquisition circuit. Automatic operation of heating judgment is achieved, and reliability and safety of heating control are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sensor heating control, and in particular to a heating control circuit and a heating control method. Background Art

[0002] In the prior art, the heating of the traditional atmospheric data system is generally controlled by pure hardware circuits, and the heating command comes from the manual heating switch on the aircraft. The advantage of this implementation method is that the equipment does not require software operation, but the disadvantage is that the pilot needs to operate each heating control. If the pilot forgets to turn on the switch during flight or forgets to turn off the switch during landing, it will affect flight safety. The new atmospheric data system heating begins to be automatically controlled by software. When the aircraft is in the air by judging the indicated airspeed or wheel load signal, the heating is turned on, otherwise the heating is turned off. Such heating control equipment will also add a manual heating switch to turn on the heating during ground detection, but ultimately it is also controlled by outputting a control signal through the software to control the on and off of the heating switch. The advantage of this implementation method is that the degree of automation is high, and the pilot does not need to operate each time, which can avoid heating failures caused by personnel operation problems, but the disadvantage is that the heating control relies on software operation output. When the software runs incorrectly or the related components of the software-mounted platform fail, the heating control function will be completely ineffective, affecting flight safety. Summary of the invention

[0003] In view of this, the embodiments of this specification provide a heating control circuit and a heating control method to achieve the purpose of effectively heating the atmospheric data system.

[0004] The embodiments of this specification provide the following technical solutions:

[0005] A heating control circuit, comprising:

[0006] Manual heating control circuit, automatic heating control circuit and heating current detection circuit;

[0007] The manual heating control circuit and the automatic heating control circuit are both connected to the heating current detection circuit;

[0008] The manual heating control circuit is used to obtain the manual heating switch signal of the aircraft, and determine whether to output the heating voltage according to the manual heating switch signal;

[0009] The automatic heating control circuit is used to receive the heating control signal output by the microprocessor, and judge whether to output the heating voltage according to the heating control signal;

[0010] The heating current detection circuit is used to detect the heating current, transmit the heating detection signal generated by the detection to the back-end voltage acquisition circuit, and judge whether the heating control circuit is working normally through the heating current detection circuit and the voltage acquisition circuit.

[0011] Furthermore, the manual heating control circuit includes:

[0012] A first solid-state relay K1, a first diode V1 and a first resistor R1;

[0013] The first input power source is connected to the first input terminal IN+ of the first solid-state relay K1 through the first resistor R1, and the manual heating switch signal is connected to the second input terminal IN- of the first solid-state relay K1 through the first diode V1;

[0014] A first output terminal OUT- of the first solid-state relay K1 is connected to a heating current detection circuit;

[0015] The second output terminal OUT+ of the first solid-state relay K1 is connected to the second input power supply and the automatic heating control circuit respectively.

[0016] Furthermore, the first input power supply is 28V, and the second input power supply is +270V.

[0017] Furthermore, the automatic heating control circuit includes:

[0018] A second solid-state relay K2 and a second resistor R2;

[0019] A first input terminal IN+ of the second solid-state relay K2 is connected to VCC via a second resistor R2, and a heating control signal is connected to a second input terminal IN- of the second solid-state relay K2;

[0020] A first output terminal OUT- of the second solid-state relay K2 is connected to a heating current detection circuit;

[0021] The second output terminal OUT+ of the second solid-state relay K2 is connected to the third input power source and the automatic heating control circuit respectively.

[0022] Furthermore, the third input power supply is +270V.

[0023] Furthermore, the heating current detection circuit includes:

[0024] Hall sensor D1, first capacitor C1, second capacitor C2 and third capacitor C3;

[0025] The first current inflow pin IP+ of the Hall sensor D1 is connected to the first output terminal OUT- of the manual heating control circuit, and the second current inflow pin IP+ of the Hall sensor D1 is connected to the first output terminal OUT- of the automatic heating control circuit;

[0026] The first current outflow pin IP- and the second current outflow pin IP- of the Hall sensor D1 are both connected to 270VGND;

[0027] One end of the VCC port of the Hall sensor D1 is connected to VCC, and the other end is connected to GND through the first capacitor C1;

[0028] One end of the VIOUT output port of the Hall sensor D1 is connected to GND through the second capacitor C2, and the other end of the VIOUT output port outputs a heating detection signal, wherein the heating detection signal is a voltage value generated after conversion by the Hall sensor D1;

[0029] The FILTER output port of the Hall sensor D1 is connected to GND via the third capacitor C3;

[0030] The GND port of the Hall sensor D1 is connected to GND.

[0031] A heating control method, the heating control method uses a heating control circuit to heat an air data system, comprising:

[0032] The external temperature control software determines whether the atmospheric data system needs to be heated according to the indicated airspeed and wheel load signals, and if necessary, outputs a first discrete quantity through the IO port of the microprocessor, and outputs the first discrete quantity as a heating control signal to the automatic heating control circuit;

[0033] If the optocoupler isolation signal of the manual heating switch on the aircraft is received, the optocoupler isolation signal is output to the manual heating control circuit.

[0034] Furthermore, the heating control method further includes:

[0035] When a heating current is generated at the load of the heating current detection circuit, a Hall sensor D1 is used in the current loop of the heating current detection circuit for detection, and the sensed voltage is output to the back-end voltage acquisition circuit to monitor the current heating current in real time and assist in determining whether the heating control function of the heating control circuit is working normally.

[0036] Compared with the prior art, the at least one technical solution adopted in the embodiments of this specification can achieve the following beneficial effects:

[0037] The automatic operation of heating judgment is realized, and the manual heating switch can be used for forced operation when the automatic heating fails, which improves the reliability and safety of heating control. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 4 is a circuit diagram of a heating control circuit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0040] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0041] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0042] There are currently two ways to control the heating of the atmospheric data system: one is to control it through hardware circuits, collect the manual heating switch signal on the aircraft, and turn the heating power on or off. This method has high requirements on personnel operation, and incorrect operation will affect flight safety; the other is to collect the indicated airspeed, wheel load signal, and manual heating switch signal through software, and after comprehensive judgment, output the heating control instruction to turn the heating power on or off. This method relies on software operation to be implemented. If the software cannot run correctly, it will affect flight safety.

[0043] The present invention proposes a heating control circuit combining software and hardware, which not only realizes the automatic operation of heating judgment, but also can perform forced operation through a manual heating switch when automatic heating fails, thereby improving the reliability and safety of heating control.

[0044] The heating control circuit of the embodiment of the present invention is a 270V heating control circuit of an atmospheric data system combining software and hardware. Figure 1 As shown, the circuit consists of two parts:

[0045] 1) The first part of the control instructions comes from the software judgment output. The software receives the indicated airspeed and wheel load signals and makes a comprehensive judgment. If heating is required, the discrete quantity "1" (i.e. high level) is output through the IO port of the microprocessor. This level is isolated by the photoelectric coupler and output to the heating control circuit to realize automatic heating judgment;

[0046] 2) The second part of the control instructions comes from the manual heating switch on the machine, which is directly output to the heating control circuit after being isolated by an optocoupler, without the need for software operation.

[0047] like Figure 1 As shown, a heating control circuit comprises:

[0048] A manual heating control circuit, an automatic heating control circuit and a heating current detection circuit. Both the manual heating control circuit and the automatic heating control circuit are connected to the heating current detection circuit.

[0049] The manual heating control circuit is used to obtain the manual heating switch signal of the aircraft, and judge whether to output the heating voltage through the manual heating switch signal. The automatic heating control circuit is used to receive the heating control signal output by the microprocessor, and judge whether to output the heating voltage through the heating control signal.

[0050] The heating current detection circuit is used to detect the heating current, transmit the heating detection signal generated by the detection to the back-end voltage acquisition circuit, and judge whether the heating control circuit is working normally through the heating current detection circuit and the voltage acquisition circuit.

[0051] Specifically, the manual heating control circuit includes:

[0052] The first solid-state relay K1, the first diode V1 and the first resistor R1. The first input power supply is connected to the first input terminal IN+ of the first solid-state relay K1 through the first resistor R1, and the manual heating switch signal is connected to the second input terminal IN- of the first solid-state relay K1 through the first diode V1. The first output terminal OUT- of the first solid-state relay K1 is connected to the heating current detection circuit. The second output terminal OUT+ of the first solid-state relay K1 is respectively connected to the second input power supply and the automatic heating control circuit.

[0053] Among them, the first input power supply is 28V, and the second input power supply is +270V.

[0054] In one embodiment of the invention, the first solid-state relay K1 is a solid relay for realizing manual heating control. When the manual heating switch on the machine is turned on, the "manual heating switch signal" is 28VGND, the solid relay pin 3 (first output terminal OUT-) and pin 5 (second output terminal OUT+) are turned on, the 270V heating power supply is turned on, and the circuit outputs the heating voltage; when the manual heating switch on the machine is turned off, the "manual heating switch signal" is suspended, the solid relay pin 3 (first output terminal OUT-) and pin 5 (second output terminal OUT+) are disconnected, the 270V heating power supply is not turned on, and the circuit does not output the heating voltage, thereby realizing the manual heating control function.

[0055] Specifically, the automatic heating control circuit includes:

[0056] The second solid-state relay K2 and the second resistor R2. The first input terminal IN+ of the second solid-state relay K2 is connected to VCC through the second resistor R2, and the heating control signal is connected to the second input terminal IN- of the second solid-state relay K2. The first output terminal OUT- of the second solid-state relay K2 is connected to the heating current detection circuit. The second output terminal OUT+ of the second solid-state relay K2 is respectively connected to the third input power supply and the automatic heating control circuit. The third input power supply is +270V.

[0057] Specifically, the heating current detection circuit includes:

[0058] Hall sensor D1, first capacitor C1, second capacitor C2 and third capacitor C3;

[0059] The first current inflow pin IP+ of the Hall sensor D1 is connected to the first output terminal OUT- of the manual heating control circuit, and the second current inflow pin IP+ of the Hall sensor D1 is connected to the first output terminal OUT- of the automatic heating control circuit;

[0060] The first current outflow pin IP- and the second current outflow pin IP- of the Hall sensor D1 are both connected to 270VGND;

[0061] One end of the VCC port of the Hall sensor D1 is connected to VCC, and the other end is connected to GND through the first capacitor C1;

[0062] One end of the VIOUT output port of the Hall sensor D1 is connected to GND through the second capacitor C2, and the other end of the VIOUT output port outputs a heating detection signal, wherein the heating detection signal is a voltage value generated after conversion by the Hall sensor D1;

[0063] The FILTER output port of the Hall sensor D1 is connected to GND via the third capacitor C3;

[0064] The GND port of the Hall sensor D1 is connected to GND.

[0065] In one embodiment of the invention, the second solid-state relay K2 is also a solid-state relay, which is used to realize automatic heating control. The product CPU receives the indicated airspeed and wheel load signals and performs calculations. If heating is required, "0" (i.e., low level) is output through the IO port, and the solid-state relay pin 3 (first output terminal OUT-) and pin 4 (second output terminal OUT+) are turned on, the 270V heating power supply is turned on, and the circuit outputs a heating voltage; if the CPU calculates that heating is not required, it outputs "1" (i.e., high level) through the IO port, and the solid-state relay pin 3 (first output terminal OUT-) and pin 4 (second output terminal OUT+) are disconnected, the 270V heating power supply is not turned on, and the circuit does not output a heating voltage.

[0066] The first solid-state relay K1 and the second solid-state relay K2 in the manual heating control circuit and the automatic heating control circuit are both solid-state relays with a rated voltage of 270V, a rated current of 10A, and are normally open. The difference is that the manual heating input signal is generally 28V, and the automatic heating signal output through the CPU is generally 5V or 3.3V. Therefore, the input voltage of the first solid-state relay K1 is selected as 28V, and the input voltage of K2 is 5V. It can also be selected according to the voltage requirements in actual applications; solid-state relays are different from electromagnetic relays in traditional circuits. They have no mechanical contacts, no usage restrictions, and high reliability. R1 and R2 are current limiting resistors, which can be selected according to the relay input current requirements.

[0067] A heating control method, the heating control method uses a heating control circuit to heat an air data system, comprising:

[0068] The external temperature control software determines whether the atmospheric data system needs to be heated according to the indicated airspeed and wheel load signals, and if necessary, outputs a first discrete quantity through the IO port of the microprocessor, and outputs the first discrete quantity as a heating control signal to the automatic heating control circuit;

[0069] If the optocoupler isolation signal of the manual heating switch on the aircraft is received, the optocoupler isolation signal is output to the manual heating control circuit.

[0070] In addition, according to actual usage needs, a heating current detection circuit is added. When 270V is output normally and a heating current is generated at the load, a Hall sensor D1 is used in the current loop for detection, and the sensed voltage is output to the back-end voltage acquisition circuit. The current heating current can be monitored in real time to assist in determining whether the heating control function is working normally.

[0071] Furthermore, the heating control method further includes:

[0072] When a heating current is generated at the load of the heating current detection circuit, a Hall sensor D1 is used in the current loop of the heating current detection circuit for detection, and the sensed voltage is output to the back-end voltage acquisition circuit to monitor the current heating current in real time and assist in determining whether the heating control function of the heating control circuit is working normally.

[0073] Both the automatic heating control circuit and the manual heating control circuit can control the on and off of the 270V power supply, realizing automatic, highly reliable and highly safe heating control.

[0074] Beneficial effects of the embodiments of the present invention:

[0075] The embodiment of the present invention designs a 270V heating control circuit that combines software and hardware. The heating control circuit can realize automatic heating control, automatically turn on heating when the aircraft is flying, and automatically turn off heating after the aircraft lands, saving the pilot's operating steps and enhancing safety; it can also control the heating in time through manual heating when the automatic heating fails, thereby improving the reliability and safety of the aircraft and solving the problems of low automation, complicated operating steps and low reliability of current heating control products.

[0076] The above is only a specific embodiment of the present invention, and cannot be used to limit the scope of the invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the scope of protection of the patent of the present invention, should still fall within the scope of this patent. In addition, the technical features of the present invention can be freely combined with each other, with each other, and with each other.

Claims

1. A heating control circuit, characterized in that: include: Manual heating control circuit, automatic heating control circuit and heating current detection circuit; The manual heating control circuit and the automatic heating control circuit are both connected to the heating current detection circuit; The manual heating control circuit is used to obtain a manual heating switch signal of the aircraft, and determine whether to output a heating voltage according to the manual heating switch signal; The automatic heating control circuit is used to receive a heating control signal output by a microprocessor, and determine whether to output a heating voltage according to the heating control signal; The heating current detection circuit is used to detect the heating current, transmit the heating detection signal generated by the detection to the rear-end voltage acquisition circuit, and judge whether the heating control circuit is working normally through the heating current detection circuit and the voltage acquisition circuit.

2. The heating control circuit according to claim 1, characterized in that: The manual heating control circuit comprises: A first solid-state relay K1, a first diode V1 and a first resistor R1; The first input power source is connected to the first input terminal IN+ of the first solid-state relay K1 through the first resistor R1, and the manual heating switch signal is connected to the second input terminal IN- of the first solid-state relay K1 through the first diode V1; The first output terminal OUT- of the first solid-state relay K1 is connected to the heating current detection circuit; The second output terminal OUT+ of the first solid-state relay K1 is connected to the second input power supply and the automatic heating control circuit respectively.

3. The heating control circuit according to claim 2, characterized in that: The first input power supply is 28V, and the second input power supply is +270V.

4. The heating control circuit according to claim 1, characterized in that: The automatic heating control circuit includes: A second solid-state relay K2 and a second resistor R2; The first input terminal IN+ of the second solid-state relay K2 is connected to VCC through the second resistor R2, and the heating control signal is connected to the second input terminal IN- of the second solid-state relay K2; The first output terminal OUT- of the second solid-state relay K2 is connected to the heating current detection circuit; The second output terminal OUT+ of the second solid-state relay K2 is connected to the third input power supply and the automatic heating control circuit respectively.

5. The heating control circuit according to claim 4, characterized in that: The third input power supply is +270V.

6. The heating control circuit according to claim 1, characterized in that: The heating current detection circuit comprises: Hall sensor D1, first capacitor C1, second capacitor C2 and third capacitor C3; The first current inflow pin IP+ of the Hall sensor D1 is connected to the first output terminal OUT- of the manual heating control circuit, and the second current inflow pin IP+ of the Hall sensor D1 is connected to the first output terminal OUT- of the automatic heating control circuit; The first current outflow pin IP- and the second current outflow pin IP- of the Hall sensor D1 are both connected to 270VGND; One end of the VCC port of the Hall sensor D1 is connected to VCC, and the other end is connected to GND through the first capacitor C1; One end of the VIOUT output port of the Hall sensor D1 is connected to GND through the second capacitor C2, and the other end of the VIOUT output port outputs a heating detection signal, wherein the heating detection signal is a voltage value generated after conversion by the Hall sensor D1; The FILTER output port of the Hall sensor D1 is connected to GND through the third capacitor C3; A GND port of the Hall sensor D1 is connected to GND.

7. A heating control method, wherein the heating control method uses the heating control circuit according to any one of claims 1 to 6 to heat an air data system, characterized in that: include: The external temperature control software determines whether the air data system needs to be heated according to the indicated airspeed and wheel load signals, and if necessary, outputs a first discrete quantity through the IO port of the microprocessor, and outputs the first discrete quantity as a heating control signal to the automatic heating control circuit; If an optocoupler isolation signal of a manual heating switch on the aircraft is received, the optocoupler isolation signal is output to the manual heating control circuit.

8. The heating control method according to claim 7, characterized in that: Also includes: When a heating current is generated at the load of the heating current detection circuit, a Hall sensor D1 is used in the current loop of the heating current detection circuit for detection, and the sensed voltage is output to the voltage acquisition circuit at the back end to monitor the current heating current in real time and assist in determining whether the heating control function of the heating control circuit is working normally.

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