Seat power supply equipment for civil aircraft

Abstract

The invention relates to seat power supply equipment for a civil aircraft, and the equipment comprises a power conversion module which is used for converting an AC power supply on the aircraft into a DC power supply; the USB interface is connected with the output end of the power supply conversion module and is used for providing a charging interface for charging equipment; and the voltage compensation module is used for judging whether an adjusting circuit needs to be connected to the power supply conversion module or not according to the voltage value of the USB interface so as to stabilize the voltage of the USB interface at a preset value. A direct current conversion module does not need to be configured, the size and the weight are reduced, and it is guaranteed that the working voltage of the USB charging port does not drop when high-power charging equipment is used.

Description

Technical Field

[0001] The present invention relates to the technical field of aviation airborne electronic equipment, and in particular to a seat power supply device used in civil aircraft. Background Art

[0002] At present, civil aircraft use 115V / 400Hz medium frequency AC power to power electrical equipment, which cannot directly power electronic devices carried by passengers. Therefore, a power supply device installed on the seat is needed, which includes a power conversion device to convert the 115V / 400Hz medium frequency AC power into a DC power supply, which is transmitted to multiple charging units through cables for passengers to use.

[0003] With the emergence of high-power charging devices such as super fast charging, the current from the power conversion device to the charging unit is getting larger and larger, causing the voltage drop on the transmission cable to increase. In order to reduce the impact of the voltage drop, the power conversion device generally outputs a relatively high-amplitude DC power supply such as 28V, and the charging unit then converts the 28V DC power supply into a voltage that can be directly used by electronic equipment such as 5V. In this way, the charging unit must include a DC conversion module, which is not conducive to reducing the volume and weight. At present, in order to improve the passenger experience, the number of charging units deployed on aircraft will continue to increase, and there are increasingly higher requirements for reducing the volume and weight of the charging units. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a seat power supply device for civil aircraft, which does not require a DC conversion module, is beneficial to reducing the volume and weight, and ensures that the working voltage of the USB charging port does not drop when using a high-power charging device.

[0005] The technical solution adopted by the present invention to solve the technical problem is: to provide a seat power supply device for a civil aircraft, comprising:

[0006] A power conversion module, used to convert the onboard AC power into DC power;

[0007] A USB interface, connected to the output end of the power conversion module, for providing a charging interface for a charging device;

[0008] The voltage compensation module is used to determine whether to connect the adjustment circuit to the power conversion module according to the voltage value of the USB interface so as to stabilize the voltage of the USB interface at a preset value.

[0009] The voltage compensation module includes a differential sampling circuit, a voltage comparison circuit and a control adjustment circuit connected in sequence; the differential sampling circuit is used to collect the voltage value of the USB interface, the voltage comparison circuit is used to compare the collected voltage value of the USB interface with the voltage value of the reference voltage terminal, and output a control signal when the voltage value of the USB interface is less than the voltage value of the reference voltage terminal; the control adjustment circuit is used to connect itself to the output end of the power conversion module according to the control signal.

[0010] The control adjustment circuit comprises a transistor, the base of the transistor is connected to the output end of the voltage comparison circuit, the emitter is connected to the output end of the power conversion module, and the collector is connected to the reference voltage end through a resistor.

[0011] The power conversion module includes a filter and rectifier circuit, a PFC circuit and a DC converter which are connected in sequence. The filter and rectifier circuit is used to convert the onboard AC power supply into a pulsating DC power supply; the PFC circuit is used to improve the power factor of the pulsating DC power supply; and the DC converter is used to convert the pulsating DC power supply with improved power factor into a constant DC power supply.

[0012] The PFC circuit includes an inductor, a MOS tube, a diode, a capacitor and a controller. One end of the inductor is connected to the first output end of the filter and rectifier circuit, and the other end is connected to the positive electrode of the diode. The negative electrode of the diode is connected to one end of the capacitor, and the other end of the capacitor is connected to the second output end of the filter and rectifier circuit. The drain of the MOS tube is connected to the positive electrode of the diode, the source is connected to the second output end of the filter and rectifier circuit, and the gate is connected to the controller. The controller adjusts the duty cycle control signal of the MOS tube according to the output voltage of the PFC circuit.

[0013] The seat power supply device for civil aircraft also includes an enabling control module, which is connected to the controller and is used to control the controller according to input voltage, input current, output voltage, output current and equipment operating temperature.

[0014] The enabling control module comprises:

[0015] A first current and voltage acquisition circuit, used for acquiring an input voltage and an input current of the seat power supply device;

[0016] A second current and voltage acquisition circuit, used for acquiring the output voltage and output current of the seat power supply device;

[0017] A temperature collection circuit, used to collect the temperature of the seat power supply device;

[0018] A first comparison circuit, used for comparing the collected input voltage and input current with an input voltage threshold range and an input current threshold range respectively, to obtain a first output signal;

[0019] A second comparison circuit is used to compare the collected output voltage and output current with the output voltage threshold range and the output current threshold range respectively to obtain a second output signal;

[0020] A third comparison circuit is used to compare the collected temperature with a preset temperature to obtain a third output signal;

[0021] The logic judgment circuit is used to perform logic operations on the first output signal, the second output signal and the third output signal to determine whether to put the controller into a working state.

[0022] The USB interface includes a USB TYPE-A interface and a USB TYPE-C interface.

[0023] Beneficial Effects

[0024] Due to the adoption of the above-mentioned technical scheme, the present invention has the following advantages and positive effects compared with the prior art: the present invention detects the voltage of the USB interface in real time through the voltage compensation module, and determines whether the control adjustment circuit is connected to the output end of the power conversion module according to the detected voltage value. When the control adjustment circuit is connected to the output end of the power conversion module, the voltage of the USB interface can reach a preset value. The present invention ensures that the working voltage of the USB charging port does not drop when using a high-power charging device, and there is no need to configure a DC conversion module, which is beneficial to reducing the volume and weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural block diagram of a seat power supply device for a civil aircraft according to an embodiment of the present invention;

[0026] Figure 2 is a circuit diagram of a power conversion module in an embodiment of the present invention;

[0027] Figure 3 is a circuit diagram of a voltage compensation module in an embodiment of the present invention;

[0028] Figure 4 It is a structural block diagram of an enabling control module in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0030] An embodiment of the present invention relates to a seat power supply device for a civil aircraft, such as Figure 1 As shown, it includes a power conversion module, a USB interface and a voltage compensation module. Among them, the power conversion module is used to convert the on-board AC power into a DC power; the USB interface is connected to the output end of the power conversion module and is used to provide a charging interface for the charging device; the voltage compensation module is used to determine whether to connect the adjustment circuit to the power conversion module according to the voltage value of the USB interface so that the voltage of the USB interface is stabilized at a preset value. The USB interface in this embodiment has two forms: a single-port charging port and a dual-port charging port. The single-port charging port is a USB TYPE-A interface, and the dual-port charging port is a USB TYPE-A interface and a USB TYPE-C interface, which can be arranged according to the characteristics of the aircraft seat.

[0031] like Figure 2 As shown, the power conversion module in this embodiment includes a filter rectifier circuit, a PFC circuit and a DC converter connected in sequence, wherein the filter rectifier circuit is used to convert the onboard AC power supply into a pulsating DC power supply; the PFC circuit is used to improve the power factor of the pulsating DC power supply; and the DC converter is used to convert the pulsating DC power supply after the power factor is improved into a constant DC power supply. Among them, the DC converter can use a non-isolated DC-DC converter module made by Murata Manufacturing, which is small in size and can meet the requirements of being installed in an aircraft seat.

[0032] The filter and rectifier circuit in this embodiment includes a filter part and a rectifier part, wherein the filter part can adopt an RC filter circuit, which can reduce the electromagnetic conduction and electromagnetic radiation interference of external electronic equipment to the seat power supply equipment, and also reduce the electromagnetic conduction and electromagnetic radiation interference of the seat power supply equipment to external electronic equipment; the rectifier part can adopt a single-phase bridge rectifier circuit composed of four diodes, through which the input alternating current can be converted into pulsating direct current.

[0033] The PFC circuit in this embodiment includes an inductor, a MOS tube, a diode, a capacitor and a controller, one end of the inductor is connected to the first output end of the filter and rectifier circuit, the other end is connected to the positive electrode of the diode, the negative electrode of the diode is connected to one end of the capacitor, the other end of the capacitor is connected to the second output end of the filter and rectifier circuit, the drain of the MOS tube is connected to the positive electrode of the diode, the source is connected to the second output end of the filter and rectifier circuit, and the gate is connected to the controller, and the controller adjusts the duty cycle control signal of the MOS tube according to the output voltage of the PFC circuit. The controller adopts double closed-loop control, and its control principle is as follows: the output voltage of the PFC circuit is compared with the preset reference voltage, and the output of the voltage loop is calculated through the voltage loop to obtain the output of the voltage loop, and then the output of the voltage loop is sent to the multiplier to multiply the input voltage to obtain a current reference value, and the current reference value is compared with the switch current of the MOS tube and the duty cycle control signal of the MOS tube is obtained after the current loop, and then the on and off of the MOS tube is controlled by the driving circuit, so that the input current waveform is consistent with the output voltage waveform, so as to improve the power factor of the power conversion. The control logic of the voltage loop is as follows: when the detected output voltage is less than the preset reference voltage, the output of the voltage loop increases; conversely, when the detected output voltage is greater than the preset reference voltage, the output of the voltage loop decreases. The control logic of the current loop is as follows: when the output voltage is less than the reference voltage, the output of the voltage loop increases, that is, the reference current increases, thereby increasing the output control amount of the current loop, increasing the duty cycle, increasing the inductor current, and increasing the output voltage; conversely, when the output voltage is greater than the reference voltage, the output of the voltage loop decreases, that is, the reference current decreases, thereby decreasing the output control amount of the current loop, decreasing the duty cycle, decreasing the inductor current, and decreasing the output voltage.

[0034] like Figure 3 As shown, the voltage compensation module includes a differential sampling circuit, a voltage comparison circuit and a control adjustment circuit connected in sequence; the differential sampling circuit is used to collect the voltage value of the USB interface, the voltage comparison circuit is used to compare the collected voltage value of the USB interface with the voltage value of the reference voltage terminal, and output a control signal when the voltage value of the USB interface is less than the voltage value of the reference voltage terminal; the control adjustment circuit is used to connect itself to the output terminal of the power conversion module according to the control signal. The control adjustment circuit of this embodiment includes a transistor, the base of the transistor is connected to the output terminal of the voltage comparison circuit, the emitter is connected to the output terminal of the power conversion module, and the collector is connected to the reference voltage terminal through a resistor.

[0035] The differential sampling circuit in this embodiment divides the voltage of the USB interface collected by the resistor R47, the resistor R50 and the resistor R51, and then passes through the differential follower amplifier circuit and is filtered by the RC low-pass filter circuit, and finally inputs it to the first input terminal of the voltage comparison circuit. The second input of the voltage comparison circuit is connected to the reference voltage terminal. When the voltage value of the USB interface is less than the voltage value of the reference voltage terminal (for example, 5V), a high level is output, which is sent to the base of the control transistor to turn on the transistor. At this time, the signal of the reference voltage terminal is directly pulled to the output terminal of the power conversion module, so that the voltage at the USB interface is 5V, ensuring that the voltage at the USB interface is stable at 5V under high current conditions, meeting the power needs of passengers. When the voltage value of the USB interface is 5V, the voltage comparison circuit will output a low level, so that the transistor is turned off. At this time, the control adjustment circuit is not connected to the power conversion module.

[0036] It is worth mentioning that the seat power supply equipment for civil aircraft in this embodiment also includes an enable control module, which is connected to the controller in the PFC circuit in the power conversion module, and is used to control the controller in the PFC circuit in the power conversion module according to the input voltage, input current, output voltage, output current and equipment operating temperature.

[0037] like Figure 4As shown, the enabling control module in this embodiment includes: a first current and voltage acquisition circuit, which is used to acquire the input voltage and input current of the seat power supply device; a second current and voltage acquisition circuit, which is used to acquire the output voltage and output current of the seat power supply device; a temperature acquisition circuit, which is used to acquire the temperature of the seat power supply device; a first comparison circuit, which is used to compare the acquired input voltage and input current with the input voltage threshold range and the input current threshold range respectively, to obtain a first output signal; a second comparison circuit, which is used to compare the acquired output voltage and output current with the output voltage threshold range and the output current threshold range respectively, to obtain a second output signal; a third comparison circuit, which is used to compare the acquired temperature with the preset temperature, to obtain a third output signal; and a logic judgment circuit, which is used to perform logic operations on the first output signal, the second output signal and the third output signal to determine whether to enable the controller to enter the working state. Among them, the first current and voltage acquisition circuit and the second current and voltage acquisition circuit can both be implemented using the differential sampling circuit in the voltage compensation module, which will not be repeated here. The judgment logic of the logic judgment circuit in this embodiment is: when the input voltage, input current, output voltage and output current are all within the normal range, and the operating temperature of the device is lower than the upper limit, the output signal of the logic judgment circuit is a start signal, which is sent to the controller to start the PFC circuit; if any of the above conditions is not met, the output signal of the logic judgment circuit is a shutdown signal, which is sent to the controller to stop the PFC circuit. Therefore, the logic judgment circuit of this embodiment can be implemented by a three-input AND gate, and its output is used as an enable signal of the controller. It is worth mentioning that the output of the logic judgment circuit can also be used as a control signal of the status indicator. When the input voltage, input current, output voltage and output current are all within the normal range, and the operating temperature of the device is lower than the upper limit, the output signal of the logic judgment circuit can also be sent to the LED drive circuit, so that the LED status indicator is always on. When any of the above conditions is not met, the output signal of the logic judgment module can also be sent to the LED drive circuit, so that the LED status indicator flashes.

[0038] It is not difficult to find that the present invention detects the voltage of the USB interface in real time through the voltage compensation module, and determines whether the control adjustment circuit is connected to the output end of the power conversion module according to the detected voltage value. When the control adjustment circuit is connected to the output end of the power conversion module, the voltage of the USB interface can reach a preset value. The present invention ensures that the working voltage of the USB charging port does not drop when using a high-power charging device, and there is no need to configure a DC conversion module, which is beneficial to reducing the volume and weight.

Claims

1. A seat power supply device for civil aircraft, characterized in that: include: A power conversion module, used to convert the onboard AC power into DC power; A USB interface, connected to the output end of the power conversion module, for providing a charging interface for a charging device; The voltage compensation module is used to determine whether to connect the adjustment circuit to the power conversion module according to the voltage value of the USB interface so as to stabilize the voltage of the USB interface at a preset value.

2. The seat power supply device for civil aircraft according to claim 1, characterized in that: The voltage compensation module includes a differential sampling circuit, a voltage comparison circuit and a control adjustment circuit connected in sequence; the differential sampling circuit is used to collect the voltage value of the USB interface, the voltage comparison circuit is used to compare the collected voltage value of the USB interface with the voltage value of the reference voltage terminal, and output a control signal when the voltage value of the USB interface is less than the voltage value of the reference voltage terminal; The control adjustment circuit is used to connect itself to the output end of the power conversion module according to the control signal.

3. The seat power supply device for civil aircraft according to claim 2, characterized in that: The control adjustment circuit comprises a transistor, the base of the transistor is connected to the output end of the voltage comparison circuit, the emitter is connected to the output end of the power conversion module, and the collector is connected to the reference voltage end through a resistor.

4. The seat power supply device for civil aircraft according to claim 1, characterized in that: The power conversion module includes a filter and rectifier circuit, a PFC circuit and a DC converter which are connected in sequence. The filter and rectifier circuit is used to convert the onboard AC power supply into a pulsating DC power supply; the PFC circuit is used to improve the power factor of the pulsating DC power supply; and the DC converter is used to convert the pulsating DC power supply with improved power factor into a constant DC power supply.

5. The seat power supply device for civil aircraft according to claim 4, characterized in that: The PFC circuit includes an inductor, a MOS tube, a diode, a capacitor and a controller. One end of the inductor is connected to the first output end of the filter and rectifier circuit, and the other end is connected to the positive electrode of the diode. The negative electrode of the diode is connected to one end of the capacitor, and the other end of the capacitor is connected to the second output end of the filter and rectifier circuit. The drain of the MOS tube is connected to the positive electrode of the diode, the source is connected to the second output end of the filter and rectifier circuit, and the gate is connected to the controller. The controller adjusts the duty cycle control signal of the MOS tube according to the output voltage of the PFC circuit.

6. The seat power supply device for civil aircraft according to claim 5, characterized in that: It also includes an enabling control module, which is connected to the controller and is used to control the controller according to input voltage, input current, output voltage, output current and device operating temperature.

7. The seat power supply device for civil aircraft according to claim 6, characterized in that: The enabling control module comprises: A first current and voltage acquisition circuit, used for acquiring an input voltage and an input current of the seat power supply device; A second current and voltage acquisition circuit, used for acquiring the output voltage and output current of the seat power supply device; A temperature collection circuit, used to collect the temperature of the seat power supply device; A first comparison circuit, used for comparing the collected input voltage and input current with an input voltage threshold range and an input current threshold range respectively, to obtain a first output signal; A second comparison circuit is used to compare the collected output voltage and output current with the output voltage threshold range and the output current threshold range respectively to obtain a second output signal; A third comparison circuit is used to compare the collected temperature with a preset temperature to obtain a third output signal; The logic judgment circuit is used to perform logic operations on the first output signal, the second output signal and the third output signal to determine whether to put the controller into a working state.

8. The seat power supply device for civil aircraft according to claim 1, characterized in that: The USB interface includes a USB TYPE-A interface and a USB TYPE-C interface.

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