Terminal equipment and control panel thereof

Abstract

The utility model discloses terminal equipment and a control panel thereof. The hardware health of a data storage unit is guaranteed. The control panel of the terminal equipment comprises a power supply circuit 1 and a plurality of loads, the plurality of loads comprise a main chip 2, a data storage unit 3, a power-off detection circuit 4 and an energy storage unit 5; wherein the power supply output end of the power supply circuit 1 is connected with each load; the power supply circuit 1 is used for receiving input of an external power supply and converting the input into voltage required by working of each load; the charging and discharging end of the energy storage unit 5 is connected with the power input ends of the main chip 2, the data storage unit 3 and the power failure detection circuit 4; the signal output end of the power-off detection circuit 4 is connected with the signal input end of the main chip 2; the power failure detection circuit 4 is used for detecting whether the external power supply is powered off or not, if not, a first signal is sent to the main chip 2, and if yes, a second signal is sent to the main chip 2; and the main chip 2 is in communication connection with the data storage unit 3.

Description

Technical Field

[0001] This application relates to the technical field of power-off emergency protection, and particularly relates to a terminal device and its control board. Background Art

[0002] The control board is a key component in a terminal device, on which a power supply circuit and multiple loads are deployed. These loads mainly include a main chip and a data storage unit, etc. Among them, the control board receives a power input, and after being processed by the power supply circuit, the power input is supplied to each load. The data storage unit is mainly responsible for recording the operating parameters of the terminal device and executing instructions issued by the main chip. However, it is inevitable that the control board suddenly loses power during operation. If the data storage unit is performing data read and write operations before the control board loses power, the sudden power-off may affect the hardware health of the data storage unit. Utility Model Content

[0003] In view of the above problems, this application provides a terminal device and its control board to ensure the hardware health of the data storage unit. The specific solutions are as follows:

[0004] A first aspect of this application provides a control board for a terminal device, including: a power supply circuit 1 and multiple loads; the multiple loads include a main chip 2, a data storage unit 3, a power-off detection circuit 4, and an energy storage unit 5;

[0005] Among them, the power output terminal of the power supply circuit 1 is connected to each load; the power supply circuit 1 is used to receive the input of an external power supply and convert it into the voltage required for each load to work;

[0006] The charge and discharge terminal of the energy storage unit 5 is connected to the power input terminals of the main chip 2, the data storage unit 3, and the power-off detection circuit 4;

[0007] The signal output terminal of the power-off detection circuit 4 is connected to the signal input terminal of the main chip 2; the power-off detection circuit 4 is used to detect whether the external power supply is powered off. If not powered off, it sends a first signal to the main chip 2. If powered off, it sends a second signal to the main chip 2;

[0008] There is a communication connection between the main chip 2 and the data storage unit 3.

[0009] In a possible implementation, the power output terminal of the power supply circuit 1 includes a first power output terminal and a second power output terminal;

[0010] The power-off detection circuit 4 includes: an optocoupler U1, a capacitor C1, a resistor R1, a resistor R2, a resistor R3, and a resistor R4;

[0011] Among them, the positive electrode of the light-emitting source of the optocoupler U1 is connected to one end of the resistor R4 and one end of the resistor R3; the other end of the resistor R3 serves as the signal input end of the power-off detection circuit 4 and is connected to the first power output end of the power supply circuit 1;

[0012] The negative electrode of the light-emitting source of the optocoupler U1 is grounded and connected to the other end of the resistor R4;

[0013] The positive electrode of the light-receiving device of the optocoupler U1 is connected to one end of the resistor R1 and one end of the resistor R2; the other end of the resistor R1 serves as the power input end of the power-off detection circuit 4 and is connected to the second power output end of the power supply circuit 1;

[0014] The other end of the resistor R2 is connected to the high-voltage end of the capacitor C1, and the negative electrode of the light-receiving device of the optocoupler U1 is grounded and connected to the low-voltage end of the capacitor C1; the high-voltage end of the capacitor C1 serves as the signal output end of the power-off detection circuit 4.

[0015] In a possible implementation, the power-off detection circuit 4 further includes: a diode D1;

[0016] The positive electrode of the light-emitting source of the optocoupler U1 is connected to the cathode of the diode D1; the negative electrode of the light-emitting source of the optocoupler U1 is connected to the anode of the diode D1.

[0017] In a possible implementation, the power-off detection circuit 4 further includes: a resistor R4, a diode D2, and a two-core connector; the negative electrode of the light-emitting source of the optocoupler U1 is connected to the anode of the diode D2, the cathode of the diode D2 is connected to the first pin of the two-core connector, and the second pin of the two-core connector is grounded; the resistor R4 is connected in parallel with the diode D1; the first pin and the second pin of the two-core connector are short-circuited.

[0018] In a possible implementation, the external power supply is three-phase alternating current;

[0019] The power-off detection circuit 4 includes: an optocoupler U2, a capacitor C2, a diode D3, a resistor R5, a resistor R6, a resistor R7, and a resistor R8;

[0020] Among them, the positive electrode of the light-emitting source of the optocoupler U2 is connected to the cathode of the diode D3; the anode of the diode D3 is connected to a live wire of the three-phase alternating current through the resistor R5; the negative electrode of the light-emitting source of the optocoupler U2 is connected to the neutral wire of the three-phase alternating current through the resistor R6;

[0021] The positive electrode of the light-receiving device of the optocoupler U2 is connected to one end of the resistor R7 and one end of the resistor R8; the other end of the resistor R7 serves as the power input end of the power-off detection circuit 4 and is connected to the power output end of the power supply circuit 1; the other end of the resistor R8 is connected to the high-voltage end of the capacitor C2, and the negative electrode of the light-receiving device of the optocoupler U2 is grounded and connected to the low-voltage end of the capacitor C2; the high-voltage end of the capacitor C2 serves as the signal output end of the power-off detection circuit 4.

[0022] In a possible implementation, the power-off detection circuit 4 further includes: a diode D4;

[0023] The positive electrode of the light-emitting source of the optocoupler U2 is connected to the cathode of the diode D4; the negative electrode of the light-emitting source of the optocoupler U2 is connected to the anode of the diode D4.

[0024] In a possible implementation, the control board of the terminal device further includes: a parallel circuit composed of a resistor R20 and a diode D9;

[0025] The charge and discharge terminal of the energy storage unit 5 is connected to the power output terminal of the power supply circuit 1, the power input terminal of the main chip 2, the power input terminal of the data storage unit 3, and the power input terminal of the power-off detection circuit 4 through the parallel circuit; the anode of the diode D9 is connected to the charge and discharge terminal of the energy storage unit 5.

[0026] In a possible implementation, the energy storage unit 5 is a super capacitor or a storage battery.

[0027] The second aspect of the present application provides a terminal device, including: the control board of the terminal device as described in the above first aspect or any implementation manner of the first aspect.

[0028] In a possible implementation, the terminal device is an air conditioner.

[0029] By means of the above technical solution, the present application adds a power-off detection circuit and an energy storage unit to the control board. The energy storage unit serves as a backup power supply to continue powering the power-off detection circuit, the main chip, and the data storage unit when the power supply of the control board is cut off, so as to ensure that the power-off detection circuit, the main chip, and the data storage unit can still continue to operate for a short period of time; the power-off detection circuit monitors the power supply status of the control board in real time and notifies the main chip in time when it detects that the power supply of the control board is cut off. The main chip only needs to control the data storage unit to stop data reading and writing operations after receiving this notification. Then, when the data storage unit loses the power supply of the energy storage unit, since the data storage unit is not performing data reading and writing operations, the data storage unit will not affect the hardware health due to power loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Combined with the drawings and referring to the following specific embodiments, the above and other features, advantages, and aspects of the embodiments of the present disclosure will become more obvious. Throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic, and the original elements and elements are not necessarily drawn to scale.

[0031] Figure 1 FIG. is a schematic structural diagram of a control board of a terminal device provided by the prior art;

[0032] Figure 2 FIG. is a schematic structural diagram of a control board of an air conditioner provided by the prior art;

[0033] Figure 3 Schematic diagram of a control board structure for a terminal device provided by this application;

[0034] Figure 4 Schematic diagram of another control board structure for a terminal device provided by this application;

[0035] Figure 5 Schematic diagram of a principle circuit for a power-off detection circuit provided by this application;

[0036] Figure 6 Schematic diagram of another principle circuit for a power-off detection circuit provided by this application;

[0037] Figure 7 Schematic diagram of another principle circuit for a power-off detection circuit provided by this application;

[0038] Figure 8 Schematic diagram of a parallel circuit at the front end of an energy storage unit provided by this application. Specific implementation manners

[0039] In the following elaboration, for the purpose of ensuring the accuracy of citations and the fluency of reading, the key technical terms, abbreviations or acronyms involved in the text are summarized and explained as follows:

[0040] DC DC: Direct Current to Direct Current, direct current / direct current conversion;

[0041] EEPROM: Electrically Erasable Programmable Read-Only Memory, electrically erasable programmable read-only memory;

[0042] FLASH: Flash memory;

[0043] SD: Secure Digital, secure digital;

[0044] SSD: Solid State Disk, solid state drive.

[0045] Such as Figure 1As shown, the control board is a key component in the terminal device, on which a power circuit and multiple loads are deployed. These loads include the main chip, data storage unit, and other loads. Among them, the control board receives power input, which is processed by the power circuit and then supplied to each load. The main chip is mainly responsible for receiving data from device sensors, input devices, etc., processing and analyzing it, and then making corresponding control decisions according to preset logic or algorithms. The data storage unit is mainly responsible for recording the operating parameters of the terminal device and executing instructions issued by the main chip. However, during the operation of the control board, sudden power outages (i.e., sudden disconnection of power input) are inevitable. If the data storage unit is performing data read / write operations before the control board loses power, the sudden power outage may affect the hardware health of the data storage unit.

[0046] Taking the terminal device as an air conditioner as an example, the following details its system architecture and possible problems during operation:

[0047] The air conditioner includes an indoor unit and an outdoor unit. The indoor unit and the outdoor unit are each connected to the mains power system through independent power lines to obtain power supply. Under mains power supply, the indoor unit and the outdoor unit work closely together to achieve the normal operation of the air conditioner.

[0048] Both the indoor unit and the outdoor unit are equipped with control boards, as Figure 2 shown. The two control boards exchange information and coordinate through communication lines (such as wire control, wireless communication, or dedicated communication protocols), so as to share operation data, fault information, and user requirements, and achieve more intelligent and precise control.

[0049] On the indoor unit control board, a power circuit and multiple loads are deployed; these loads include the main chip, indoor and outdoor unit communication circuit, data storage unit, and other loads (the other loads include, for example, DC DC circuit, EEPROM+FLASH, expansion valve, display board, stepper motor, DC fan, and panel controller, etc.). The power circuit includes, for example, a rectifier filter circuit and a switching power supply. The indoor unit control board receives mains input, which is rectified and filtered by the rectifier filter circuit to provide direct current to the switching power supply. The switching power supply processes the input direct current and outputs different voltages to supply power to each load. The main chip is mainly responsible for adjusting the working states of components such as the stepper motor, DC fan, and expansion valve of the indoor unit according to user operation instructions and feedback signals from indoor sensors, so as to achieve functions such as temperature adjustment, wind speed adjustment, and wind direction control. The data storage unit is mainly responsible for recording the operating parameters of the air conditioner (such as recording key information such as the operating time, fault code, temperature setting, and working mode of the air conditioner), and executing instructions issued by the main chip. The data storage unit includes, but is not limited to, memories such as SD cards and SSDs.

[0050] The outdoor unit control board is also equipped with a power circuit and multiple loads. These loads include the indoor and outdoor unit communication circuit and other loads. The outdoor unit control board adjusts the operating states of components such as the compressor and condenser fan of the outdoor unit according to the instructions sent by the indoor unit control board (such as cooling / heating mode, target temperature, etc.) and the feedback signals from outdoor sensors.

[0051] However, during the operation of the air conditioner, it is inevitable that the mains power input suddenly disconnects. In this case, all loads relying on mains power supply will lose power, including the data storage unit on the indoor unit control board. If the data storage unit is performing data read / write operations before the mains power outage, the sudden power outage will cause the data storage unit to suddenly interrupt data transmission, resulting in data transmission loss, and may further affect the hardware health of the data storage unit.

[0052] For terminal devices such as air conditioners, in order to ensure the hardware health of the data storage unit, the embodiments of the present application provide a control board for a terminal device, which adds a power-off detection circuit and an energy storage unit to the control board originally equipped with a data storage unit. The energy storage unit serves as a backup power supply to continue powering the power-off detection circuit, the main chip, and the data storage unit when the control board power supply is cut off, so as to ensure that the power-off detection circuit, the main chip, and the data storage unit can still continue to operate for a short time after the control board power supply is cut off; the power-off detection circuit monitors the power state of the control board in real time and notifies the main chip in time when it detects that the control board power supply is cut off. The main chip only needs to control the data storage unit to stop data read / write operations after receiving this notification. Then, when the data storage unit loses power (i.e., loses the power supply from the energy storage unit), since the data storage unit is not performing data read / write operations (the data storage unit has stopped data read / write operations before losing power), the data storage unit will not be affected by the loss of power in terms of hardware health.

[0053] Next, in conjunction with the accompanying drawings, a control board for a terminal device provided by the embodiments of the present application will be described in detail. Those of ordinary skill in the art can know that with the development of technology and the emergence of new scenarios, the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.

[0054] The terms "first", "second", etc. in the specification, claims, and above-mentioned drawings of the present application are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances, which is only a way of distinguishing objects with the same attributes when describing the embodiments of the present application. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion, so that a process, method, system, product, or device including a series of units does not have to be limited to those units, but may include other units not clearly listed or inherent to these process, method, product, or device.

[0055] See Figure 3 , a control board of a terminal device provided by an embodiment of the present application specifically includes a power supply circuit 1 and multiple loads; the multiple loads include a main chip 2, a data storage unit 3, a power-off detection circuit 4, and an energy storage unit 5;

[0056] Among them, the power output terminal of the power supply circuit 1 is connected to the power input terminals of each load; the power supply circuit 1 is used to receive the input of an external power supply (i.e., the control board power supply) and convert it into the voltages required for the operation of each load;

[0057] The charge and discharge terminal of the energy storage unit 5 (when the energy storage unit 5 is charging, the charge and discharge terminal of the energy storage unit 5 serves as the power input terminal of the energy storage unit 5; when the energy storage unit 5 is discharging, the charge and discharge terminal of the energy storage unit 5 serves as the power output terminal of the energy storage unit 5) is connected to the power input terminals of the main chip 2, the data storage unit 3, and the power-off detection circuit 4;

[0058] The signal output terminal of the power-off detection circuit 4 is connected to the signal input terminal of the main chip 2; the power-off detection circuit 4 is used to detect whether the external power supply is powered off. If not powered off, it sends a first signal to the main chip 2. If powered off, it sends a second signal to the main chip 2;

[0059] There is a communication connection between the main chip 2 and the data storage unit 3.

[0060] Figure 3 The working principle of the illustrated embodiment is as follows:

[0061] 1) When the external power supply input is normal (i.e., the external power supply is powered on), there is:

[0062] The external power supply input is converted by the power supply circuit 1 into the voltages required for the operation of each load and supplies power to each load.

[0063] At the same time, the energy storage unit 5 receives electrical energy from the external power supply and stores it internally. The charging process will continue until the energy storage unit 5 reaches the full state, and then the charging process will automatically stop.

[0064] At the same time, the power-off detection circuit 4 continuously monitors the voltage value at its signal input terminal, and this voltage value represents the voltage status of the external power supply supplied to the control board. When the power-off detection circuit 4 detects that this voltage value is within the normal range, it sends a signal indicating that the external power supply input is normal, that is, the first signal, to the main chip 2 to inform the main chip 2 that the current external power supply status is good.

[0065] 2) When the external power supply is powered off, there is:

[0066] The energy storage unit 5 starts to release energy and continues to supply power to the main chip 2, the data storage unit 3, and the power-off detection circuit 4 as a backup power source, so as to ensure that the main chip 2, the data storage unit 3, and the power-off detection circuit 4 can still maintain operation within a short time T.

[0067] Meanwhile, the power-off detection circuit 4 will detect that the voltage value at its signal input terminal has changed and exceeds the normal range. At this time, the power-off detection circuit 4 changes its output state and sends a signal indicating that the external power supply has been cut off, that is, the second signal, to the main chip 2 to notify the main chip 200 to execute corresponding power-off emergency protection measures.

[0068] After receiving the second signal, the main chip 200 issues a control instruction through the communication line to control the data storage unit 3 to stop data reading and writing operations. Then, when the data storage unit 3 loses the power supply from the energy storage unit 5, since the data storage unit 3 is not performing data reading and writing operations (the data storage unit 3 has stopped data reading and writing operations before the power loss), the data storage unit 3 will not be affected by the power loss in terms of its own hardware health.

[0069] Among them, the signal input terminal of the power-off detection circuit 4 can be connected to the power output terminal of the power supply circuit 1, and the external power supply is judged whether to be cut off by monitoring the power output voltage of the power supply circuit 1 (as Figure 3 shown). Or, the signal input terminal of the power-off detection circuit 4 can also be connected to the power input terminal of the power supply circuit 1, and the external power supply is judged whether to be cut off by monitoring the power input voltage of the power supply circuit 1 (as Figure 4 shown), which is not limited.

[0070] Regarding Figure 3 the embodiment shown, the power-off detection circuit 4 can adopt, for example, the circuit structure shown in Figure 5 . The power output terminal of the power supply circuit 1 includes a first power output terminal and a second power output terminal (the voltage of the first power output terminal of the power supply circuit 1 is, for example, +15V, and the voltage of the second power output terminal of the power supply circuit 1 is, for example, +5V). Figure 5 The power-off detection circuit 4 shown in

[0071] includes: an optocoupler (fully called an optoelectronic coupler) U1, a capacitor C1, a resistor R1, a resistor R2, and a resistor R3;

[0072] Among them, the positive pole of the light-emitting source of the optocoupler U1 is connected to one end of the resistor R3; the other end of the resistor R3 is used as the signal input terminal of the power-off detection circuit 4 and is connected to the first power output terminal of the power supply circuit 1;

[0073] The positive electrode of the light-receiving device of the optocoupler U1 is connected to one end of the resistor R1 and one end of the resistor R2; the other end of the resistor R1 serves as the power input terminal of the power-off detection circuit 4 and is connected to the second power output terminal of the power supply circuit 1;

[0074] The other end of the resistor R2 is connected to the high-voltage end of the capacitor C1, and the negative electrode of the light-receiving device of the optocoupler U1 is grounded and connected to the low-voltage end of the capacitor C1; the high-voltage end of the capacitor C1 serves as the signal output terminal of the power-off detection circuit 4.

[0075] Next, taking the voltage of the first power output terminal of the power supply circuit 1 as +15V and the voltage of the second power output terminal as +5V as an example, the working principle of the power-off detection circuit 4 shown is introduced: Figure 5 The working principle of the power-off detection circuit 4 shown:

[0076] The optocoupler U1 is mainly composed of two parts: a light-emitting source and a light-receiving device. The light-emitting source is usually a light-emitting diode, and the light-receiving device can be a photodiode, a phototransistor, etc.; the light-emitting source and the light-receiving device are assembled in the same airtight housing and isolated from each other by a transparent insulator. The pins of the light-emitting source are the input terminals of the optocoupler U1, and the pins of the light-receiving device are the output terminals of the optocoupler U1. When there is an electrical signal at the input terminal and the voltage of this electrical signal exceeds the conduction voltage drop uth of the light-emitting source, the light-emitting source will emit light, and the generated optical signal is received by the light-receiving device and converted into an electrical signal (that is, the light-receiving device conducts under light irradiation), thus realizing the conversion of electricity-optical-electricity.

[0077] When the control board power supply is powered on, both the +15V and +5V voltages are provided by the power supply circuit 1. At this time, the input terminal circuit of the optocoupler U1 is turned on, and then the output terminal circuit of the optocoupler U1 is also turned on. The voltage Vo of the signal output terminal of the power-off detection circuit 4 is pulled down to the ground, that is, 0V.

[0078] When the control board power supply is powered off, the +15V voltage disappears, and the +5V voltage is provided by the energy storage unit 5. At this time, the input terminal circuit of the optocoupler U1 is not turned on, and then the output terminal circuit of the optocoupler U1 is also not turned on. The voltage Vo of the signal output terminal of the power-off detection circuit 4 is pulled up to +5V.

[0079] Therefore, it can be determined whether the control board power supply is powered off according to the voltage state of the signal output terminal voltage Vo.

[0080] Both the resistor R3 and the resistor R1 are pull-up resistors, and the resistor R2 and the capacitor C1 form a resistor-capacitor filter circuit.

[0081] Still referring to Figure 5 , the power-off detection circuit 4 may further include: a diode D1; the positive electrode of the light-emitting source of the optocoupler U1 is connected to the cathode of the diode D1; the negative electrode of the light-emitting source of the optocoupler U1 is connected to the anode of the diode D1. The function of the diode D1 is to prevent the light-emitting source of the optocoupler U1 from being broken down by too high a reverse voltage.

[0082] Referring to Figure 6, any of the above power-off detection circuits 4 may further include: a resistor R4, a diode D2, and a two-core connector; the negative electrode of the light-emitting source of the optocoupler U1 is connected to the anode of the diode D2, the cathode of the diode D2 is connected to the first pin of the two-core connector, and the second pin of the two-core connector is grounded; the resistor R4 is connected in parallel with the diode D1; the first pin and the second pin of the two-core connector are short-circuited.

[0083] The two-core connector, also known as a two-pin plug and socket, is a type of connector mainly used to achieve detachable connections between circuit devices, components, or assemblies. When it is desired to enable the power-off detection circuit 4, short-circuit the first pin and the second pin of the two-core connector. The diode D2 is used to prevent the light-emitting source of the optocoupler U1 from being broken down by excessive reverse voltage.

[0084] Connecting a resistor R4 in parallel at the input end of the optocoupler U2 can prevent the floating input end of the optocoupler U2 from being in a high-impedance state. A high-impedance state is prone to being interfered with, resulting in misoperation of the optocoupler. By connecting a resistor R4 in parallel, a path can be provided for the weak current signal to prevent it from flowing through the light-emitting source of the optocoupler U2 and causing mis-conduction.

[0085] For Figure 4 the illustrated embodiment, the power-off detection circuit 4 may, for example, adopt the circuit structure as Figure 7 illustrated. The external power supply is three-phase alternating current. Figure 7 The illustrated power-off detection circuit 4 includes: an optocoupler U2, a capacitor C2, a diode D3, a resistor R5, a resistor R6, a resistor R7, and a resistor R8;

[0086] Among them, the positive electrode of the light-emitting source of the optocoupler U2 is connected to the cathode of the diode D3; the anode of the diode D3 is connected to a live wire 220V-L1 of the three-phase alternating current through the resistor R5; the negative electrode of the light-emitting source of the optocoupler U2 is connected to the neutral wire 220V-N of the three-phase alternating current through the resistor R6;

[0087] The positive electrode of the light-receiving device of the optocoupler U2 is connected to one end of the resistor R7 and one end of the resistor R8; the other end of the resistor R7 serves as the power input end of the power-off detection circuit 4 and is connected to the power output end of the power supply circuit 1 (the voltage of the power output end of the power supply circuit 1 is, for example, +5V); the other end of the resistor R8 is connected to the high-voltage end of the capacitor C2, the negative electrode of the light-receiving device of the optocoupler U2 is grounded and the low-voltage end of the capacitor C2; the high-voltage end of the capacitor C2 serves as the signal output end of the power-off detection circuit 4.

[0088] Next, taking the single-phase AC input voltage of the three-phase alternating current as 220VAC and the voltage of the power output end of the power supply circuit 1 as +5V as an example, the working principle of the Figure 7 illustrated power-off detection circuit 4 will be introduced:

[0089] When three-phase alternating current exists and is in the positive half-cycle of the three-phase alternating current, both 220VAC and +5V voltage exist. The left circuit of optocoupler U2 conducts, and then the right circuit of optocoupler U2 also conducts. The voltage Vo at the signal output end of the power-off detection circuit 4 is pulled down to the ground, that is, 0V.

[0090] When three-phase alternating current exists and is in the negative half-cycle of the three-phase alternating current, both 220VAC and +5V voltage exist, but 220VAC cannot be input into the left circuit of U2. At this time, the left circuit of optocoupler U2 does not conduct, and then the right circuit of optocoupler U2 also does not conduct. The voltage Vo at the signal output end of the power-off detection circuit 4 is 5V.

[0091] When three-phase alternating current disappears, 220VAC disappears, and the +5V voltage is provided by the energy storage unit 5. At this time, the left circuit of optocoupler U2 does not conduct because there is no 220VAC, and then the right circuit of optocoupler U2 also does not conduct. The voltage Vo at the signal output end of the power-off detection circuit 4 is 5V.

[0092] Therefore, when the voltage Vo at the signal output end is a pulse signal with a duty cycle of 50%, it can be determined that the three-phase alternating current is powered on, and when the voltage Vo at the signal output end is continuously 5V, it can be determined that the three-phase alternating current is powered off.

[0093] Resistors R5 and R6 play a current-limiting role. Resistor R7 is a pull-up resistor. Resistors R8 and capacitor C2 form a resistor-capacitor filter circuit. Diode D3 is used to prevent the voltage in the negative half-cycle of the three-phase alternating current from breaking down the light-emitting source of optocoupler U1.

[0094] Still referring to Figure 5 , the power-off detection circuit 4 may further include: diode D4; the positive electrode of the light-emitting source of optocoupler U2 is connected to the cathode of diode D4; the negative electrode of the light-emitting source of optocoupler U2 is connected to the anode of diode D4.

[0095] In a possible implementation, the energy storage unit 5 on the control board of any of the above-mentioned terminal devices is, for example, a super capacitor or a storage battery, which is not limited. Among them, the storage battery is, for example, a button battery. A button battery is also called a coin cell battery. It is a battery with an outer dimension like a small button. Usually, it has a relatively large diameter and a relatively thin thickness, and occupies little space.

[0096] In a possible implementation, referring to Figure 8 , the control board of any of the above-mentioned terminal devices further includes: a parallel circuit composed of resistor R20 and diode D9;

[0097] The charge and discharge terminals of the energy storage unit 5 are connected to the power output terminal of the power supply circuit 1 (the voltage of the power output terminal of the power supply circuit 1 is, for example, +5V), the power input terminal of the main chip 2, the power input terminal of the data storage unit 3, and the power input terminal of the power-off detection circuit 4 through the parallel circuit;

[0098] The anode of diode D9 is connected to the charge and discharge terminal of energy storage unit 5.

[0099] Figure 8 The working principle of the shown circuit is as follows:

[0100] When the power supply of the control board is powered on, diode D9 is in the cut-off state, and the +5V voltage charges energy storage unit 5 through resistor R20. Resistor R20 is a current-limiting resistor.

[0101] After the power supply of the control board is disconnected, diode D9 conducts, and current-limiting resistor R20 is bypassed by diode D9. Energy storage unit 5 discharges rapidly through diode D9 to continue powering the power-off detection circuit 4, main chip 2, and data storage unit 3. Since resistor R20 has been bypassed, the energy storage of energy storage unit 5 consumed by resistor R20 is avoided.

[0102] In addition, the embodiment of the present application also provides a terminal device, including: the control board of any one of the terminal devices provided above.

[0103] In addition to being an air conditioner, the terminal device can also be an air conditioner, intelligent range hood, intelligent refrigerator, intelligent oven, intelligent stove, intelligent washing machine, intelligent water heater, intelligent washing equipment, intelligent dishwasher, intelligent projection device, intelligent TV, intelligent drying rack, intelligent curtain, intelligent audio and video, intelligent socket, intelligent speaker, intelligent sound box, intelligent fresh air device, intelligent kitchen and bathroom equipment, intelligent bathroom equipment, intelligent floor sweeping robot, intelligent window cleaning robot, intelligent mopping robot, intelligent air purification device, intelligent steam box, intelligent microwave oven, intelligent kitchen water heater, intelligent purifier, intelligent water dispenser, intelligent door lock, etc., without limitation.

[0104] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the embodiments of the present application. Therefore, the embodiments of the present application will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control board of a terminal device, characterized in that, It includes a power supply circuit (1) and multiple loads; the multiple loads include a main chip (2), a data storage unit (3), a power-off detection circuit (4), and an energy storage unit (5); Among them, the power output terminals of the power supply circuit (1) are connected to each load; the power supply circuit (1) is used to receive the input of an external power supply and convert it into the voltage required for each load to operate; The charge and discharge terminals of the energy storage unit (5) are connected to the power input terminals of the main chip (2), the data storage unit (3), and the power-off detection circuit (4); The signal output terminal of the power-off detection circuit (4) is connected to the signal input terminal of the main chip (2); the power-off detection circuit (4) is used to detect whether the external power supply is powered off. If it is not powered off, it sends a first signal to the main chip (2). If it is powered off, it sends a second signal to the main chip (2); There is a communication connection between the main chip (2) and the data storage unit (3).

2. The control board of the terminal device according to claim 1, wherein The power output terminals of the power supply circuit (1) include a first power output terminal and a second power output terminal; The power-off detection circuit (4) includes: optocoupler U1, capacitor C1, resistor R1, resistor R2, and resistor R3; Among them, the positive pole of the light-emitting source of the optocoupler U1 is connected to one end of the resistor R3; the other end of the resistor R3 serves as the signal input terminal of the power-off detection circuit (4) and is connected to the first power output terminal of the power supply circuit (1); The negative pole of the light-emitting source of the optocoupler U1 is grounded; The positive pole of the light-receiving device of the optocoupler U1 is connected to one end of the resistor R1 and one end of the resistor R2; the other end of the resistor R1 serves as the power input terminal of the power-off detection circuit (4) and is connected to the second power output terminal of the power supply circuit (1); The other end of the resistor R2 is connected to the high-voltage end of the capacitor C1, and the negative pole of the light-receiving device of the optocoupler U1 is grounded and the low-voltage end of the capacitor C1; the high-voltage end of the capacitor C1 serves as the signal output terminal of the power-off detection circuit (4).

3. The control board of the terminal device according to claim 2, characterized in that, The power-off detection circuit (4) further includes: diode D1; the positive pole of the light-emitting source of the optocoupler U1 is connected to the cathode of the diode D1; the negative pole of the light-emitting source of the optocoupler U1 is connected to the anode of the diode D1.

4. The control board of the terminal device according to claim 2, characterized in that, The power-off detection circuit (4) further includes: resistor R4, diode D2, and a two-core connector; the negative pole of the light-emitting source of the optocoupler U1 is connected to the anode of the diode D2, the cathode of the diode D2 is connected to the first pin of the two-core connector, and the second pin of the two-core connector is grounded; the resistor R4 is connected in parallel with the diode D1; the first pin and the second pin of the two-core connector are short-circuited.

5. The control board of the terminal device according to claim 1, characterized in that, The external power supply is three-phase alternating current; The power-off detection circuit (4) includes: optocoupler U2, capacitor C2, diode D3, resistor R5, resistor R6, resistor R7, and resistor R8; Among them, the positive pole of the light-emitting source of the optocoupler U2 is connected to the cathode of the diode D3; the anode of the diode D3 is connected to a live wire of the three-phase alternating current through the resistor R5; the negative pole of the light-emitting source of the optocoupler U2 is connected to the neutral wire of the three-phase alternating current through the resistor R6; The positive electrode of the light-receiving device of the optocoupler U2 is connected to one end of the resistor R7 and one end of the resistor R8; the other end of the resistor R7 serves as the power input terminal of the power-off detection circuit (4) and is connected to the power output terminal of the power supply circuit (1); the other end of the resistor R8 is connected to the high-voltage end of the capacitor C2, and the negative electrode of the light-receiving device of the optocoupler U2 is grounded and connected to the low-voltage end of the capacitor C2; the high-voltage end of the capacitor C2 serves as the signal output terminal of the power-off detection circuit (4).

6. The control board of the terminal device according to claim 5, characterized in that, The power-off detection circuit (4) further includes: a diode D4; the positive electrode of the light-emitting source of the optocoupler U2 is connected to the cathode of the diode D4; the negative electrode of the light-emitting source of the optocoupler U2 is connected to the anode of the diode D4.

7. The control board of the terminal device according to any one of claims 1 to 6, characterized in that The control board of the terminal device further includes: a parallel circuit composed of a resistor R20 and a diode D9; The charge and discharge terminal of the energy storage unit (5) is connected to the power output terminal of the power supply circuit (1), the power input terminal of the main chip (2), the power input terminal of the data storage unit (3), and the power input terminal of the power-off detection circuit (4) through the parallel circuit; the anode of the diode D9 is connected to the charge and discharge terminal of the energy storage unit (5).

8. The control board of the terminal device according to any one of claims 1 to 6, characterized in that, The energy storage unit (5) is a super capacitor or a storage battery.

9. A terminal device, characterized in that, Includes: The control board of the terminal device according to any one of claims 1 to 8.

10. The terminal device according to claim 9, wherein The terminal device is an air conditioner.

Images