Electronic equipment, control method and device thereof, storage medium and product

Abstract

The invention discloses electronic equipment, a control method and device thereof, a storage medium and a product. The electronic equipment comprises a power factor correction (PFC) circuit and a pre-charging circuit connected with the input end of the PFC circuit. The method comprises the following steps: acquiring an input voltage value and an output voltage value of the PFC circuit; and based on the input voltage value and the output voltage value, controlling the access state of a positive temperature coefficient resistor of the pre-charging circuit. Therefore, according to the embodiment of the invention, the access state of the positive temperature coefficient resistor is jointly controlled based on the input voltage value and the output voltage value of the PFC circuit, the problem that anti-impact protection cannot be started in time due to power supply interruption during operation of the PFC circuit is solved, and the anti-impact current capability of the PFC circuit of the electronic equipment is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power supply control, and in particular to an electronic device, a control method and apparatus thereof, a storage medium and a product. BACKGROUND

[0002] A power factor correction (PFC) circuit is used to control the waveform of the input current, so that the waveforms of the input current and the input voltage are synchronized, the power factor is improved, the harmonic content is reduced, and the problems of electromagnetic interference and capacitor compatibility are solved. The PFC circuit includes various forms, such as a Boost PFC circuit and a Totem PFC circuit. At present, a new type of semiconductor device with high thermal conductivity, such as a silicon carbide fast recovery diode (SiC FRD), is usually used in the PFC circuit to improve the temperature rise problem during operation of the PFC circuit. Although the silicon carbide fast recovery diode has the characteristics of low temperature rise, the anti-impact current capacity is greatly reduced compared to that of a silicon fast recovery diode. Therefore, the PFC circuit with the silicon carbide fast recovery diode has more stringent requirements for anti-impact protection measures.

[0003] In the related art, a positive temperature coefficient (PTC) is usually used as an anti-impact protection measure for the PFC circuit, and the access state of the positive temperature coefficient is controlled based on the output voltage value of the PFC circuit, so that the positive temperature coefficient can be accessed to the PFC circuit and current limiting can be performed when the PFC circuit is started. However, power supply interruption may occur during operation of the PFC circuit. During the power supply interruption, the filter capacitor at the output end of the PFC circuit continues to discharge, so the output voltage value of the PFC circuit decreases slowly, which causes the positive temperature coefficient to not be quickly accessed to the PFC circuit when the power supply interruption occurs. Therefore, during the power supply interruption, there may be a large voltage difference between the input end and the output end of the PFC circuit, and the large voltage difference may cause damage to the devices with weak anti-impact current capacity, such as the silicon carbide fast recovery diode, in the PFC circuit. SUMMARY

[0004] Therefore, the embodiments of the present application provide an electronic device, a control method and apparatus thereof, a storage medium and a product, which aim to improve the anti-impact current capacity of the PFC circuit of the electronic device.

[0005] The technical solutions of the embodiments of the present application are implemented as follows:

[0006] In a first aspect, embodiments of the present application provide a control method of an electronic device, the electronic device comprising a PFC circuit and a pre-charge circuit connected to an input end of the PFC circuit; the method comprising:

[0007] obtaining an input voltage value and an output voltage value of the PFC circuit;

[0008] controlling an access state of a positive temperature coefficient resistor of the pre-charge circuit based on the input voltage value and the output voltage value.

[0009] In some embodiments, the controlling the access state of the positive temperature coefficient resistor of the pre-charge circuit based on the input voltage value and the output voltage value comprises:

[0010] determining that the output voltage value is greater than a first voltage threshold, a difference between the output voltage value and the input voltage value is less than a voltage difference threshold for a first time length, and the positive temperature coefficient resistor of the pre-charge circuit is in the access state, and then short-circuiting the positive temperature coefficient resistor.

[0011] In some embodiments, the controlling the access state of the positive temperature coefficient resistor of the pre-charge circuit based on the input voltage value and the output voltage value comprises:

[0012] determining that the input voltage value is less than a second voltage threshold for a second time length and the positive temperature coefficient resistor of the pre-charge circuit is in a short-circuited state, and then accessing the positive temperature coefficient resistor to the input end of the PFC circuit.

[0013] In some embodiments, the method further comprises:

[0014] detecting a running state of a load of the electronic device;

[0015] the determining that the input voltage value is less than a second voltage threshold for a second time length and the positive temperature coefficient resistor of the pre-charge circuit is in a short-circuited state, and then accessing the positive temperature coefficient resistor to the input end of the PFC circuit comprises:

[0016] if the load is in a shutdown state, in response to the determining that the input voltage value is less than a second voltage threshold for a second time length and the positive temperature coefficient resistor of the pre-charge circuit is in a short-circuited state, accessing the positive temperature coefficient resistor to the input end of the PFC circuit.

[0017] In some embodiments, the determining that the input voltage value is less than a second voltage threshold for a second time length and the positive temperature coefficient resistor of the pre-charge circuit is in a short-circuited state, and then accessing the positive temperature coefficient resistor to the input end of the PFC circuit further comprises:

[0018] If the load is in operation, in response to determining that the input voltage value is less than the second voltage threshold for a second duration and the positive temperature coefficient resistor of the pre-charging circuit is in a short-circuited state, the load is controlled to stop, and after a third duration, the positive temperature coefficient resistor is connected to the input terminal of the PFC circuit.

[0019] In some implementations, controlling the connection state of the positive temperature coefficient resistor in the pre-charging circuit includes:

[0020] The switching element of the pre-charge circuit is turned off, so that the positive temperature coefficient resistor of the pre-charge circuit is connected to the input terminal of the PFC circuit; or,

[0021] The switching element of the pre-charge circuit is turned on, so that the positive temperature coefficient resistor of the pre-charge circuit is short-circuited.

[0022] Secondly, embodiments of this application provide a control device for an electronic device, the electronic device including a PFC circuit and a pre-charging circuit connected to the input terminal of the PFC circuit; the control device includes:

[0023] The acquisition module is used to acquire the input voltage value and output voltage value of the PFC circuit;

[0024] The control module is used to control the connection state of the positive temperature coefficient resistor of the pre-charging circuit based on the input voltage value and the output voltage value.

[0025] Thirdly, embodiments of this application provide an electronic device, the electronic device including a PFC circuit and a pre-charging circuit connected to the input terminal of the PFC circuit; the electronic device further includes:

[0026] A processor, which, when running a computer program, performs the steps of the method as described in the first aspect.

[0027] In some implementations, the PFC circuit is a Boost PFC circuit, and a fast recovery diode is provided at the output of the Boost PFC circuit.

[0028] In some implementations, the PFC circuit is a totem-pole PFC circuit, and a fast recovery diode is provided on the rectifier bridge arm of the totem-pole PFC circuit.

[0029] Fourthly, embodiments of this application provide a computer storage medium storing a computer program, which, when executed by a processor, implements the steps of the method described in the first aspect.

[0030] Fifthly, embodiments of this application provide a computer program product, including a computer program that, when executed by a processor, implements the steps of the method described in the first aspect.

[0031] The technical solution provided in this application embodiment includes an electronic device comprising a PFC circuit and a pre-charging circuit connected to the input terminal of the PFC circuit; acquiring the input voltage and output voltage values ​​of the PFC circuit; and controlling the connection state of the positive temperature coefficient resistor in the pre-charging circuit based on the input and output voltage values. Thus, this application embodiment, by jointly controlling the connection state of the positive temperature coefficient resistor based on the input and output voltage values ​​of the PFC circuit, solves the problem of the PFC circuit failing to promptly activate surge protection during power outages, thereby improving the surge current resistance capability of the electronic device's PFC circuit. Attached Figure Description

[0032] Figure 1 This is a first structural schematic diagram of an electronic device according to an embodiment of this application;

[0033] Figure 2 This is a schematic diagram of the second structure of the electronic device according to an embodiment of this application;

[0034] Figure 3 This is a flowchart illustrating the control method of the electronic device according to an embodiment of this application;

[0035] Figure 4 This is a schematic diagram of the third structure of the electronic device according to an embodiment of this application;

[0036] Figure 5 This is a schematic diagram of the fourth structure of the electronic device according to an embodiment of this application;

[0037] Figure 6 This is a fifth structural schematic diagram of the electronic device according to an embodiment of this application;

[0038] Figure 7 This is a flowchart illustrating a control method for an electronic device in an application example of this application;

[0039] Figure 8 This is a schematic diagram of the structure of the control device of the electronic device according to an embodiment of this application;

[0040] Figure 9 This is a schematic diagram of the structure of an electronic device according to an embodiment of this application. Detailed Implementation

[0041] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0043] This application provides a control method for an electronic device, wherein the electronic device includes a PFC circuit.

[0044] Here, the PFC circuit is used to control the waveform of the input current, so that the waveforms of the input current and the input voltage are synchronized, thereby improving the power factor, reducing harmonic content, and solving electromagnetic interference and capacitor compatibility issues.

[0045] Here, the electronic devices in this application embodiment include devices such as air conditioners that require PFC circuits.

[0046] It is understandable that the input power of electronic devices is AC power, and the PFC circuit is used to perform power factor correction on the input power of electronic devices before supplying power to the load of electronic devices.

[0047] Here, the load of the electronic device can include a DC load or an inverter module. The inverter module is used to convert the output power of the PFC circuit and then supply power to the AC load.

[0048] Here, the PFC circuit in this application embodiment includes, but is not limited to, Boost PFC circuit and totem pole PFC circuit. The PFC circuit in this application embodiment includes a fast recovery diode.

[0049] In some embodiments, the PFC circuit of the electronic device is a Boost PFC circuit, and the circuit structure of the electronic device is as follows: Figure 1 As shown.

[0050] Specifically, in Figure 1 In the electronic device shown, the Boost PFC circuit includes a rectifier module 1, an inductor L, a first switching transistor Q1, a first diode D1, and a filter capacitor C1; wherein, the first diode D1 is a fast recovery diode, which is set at the output terminal of the Boost PFC circuit. Based on the unidirectional conduction characteristic of the first diode D1, it can cut off the discharge of the filter capacitor C1 to the inductor L.

[0051] It is understandable that by controlling the on / off state of the first switch Q1, the charging and discharging state of the inductor L can be switched, so that the Boost PFC circuit can perform power factor correction on the input power of the electronic device and then supply power to the load of the electronic device.

[0052] In some embodiments, the PFC circuit of the electronic device is a totem-pole PFC circuit, and the circuit structure of the electronic device is as follows:Figure 2 As shown.

[0053] Specifically, in Figure 2 In the electronic device shown, the totem pole PFC circuit includes an inductor L, a second switch Q2, a third switch Q3, a second diode D2, a third diode D3, and a filter capacitor C1; wherein, the second switch Q2 and the third switch Q3 are disposed on the high-frequency bridge arm; the second diode D2 and the third diode D3 are fast recovery diodes and are disposed on the rectifier bridge arm to provide a current-carrying circuit for the inductor current.

[0054] It is understandable that by controlling the on / off states of the second switch Q2 and the third switch Q3, the charging and discharging states of the inductor L can be switched, so that the totem pole PFC circuit can perform power factor correction on the input power of the electronic device and then supply power to the load of the electronic device.

[0055] In some embodiments, the fast recovery diode of the PFC circuit in the electronic device is specifically a silicon carbide fast recovery diode; that is, if the PFC circuit of the electronic device is a Boost PFC circuit, then... Figure 1 The first diode D1 shown is a silicon carbide fast recovery diode; or, if the PFC circuit of the electronic device is a totem-pole PFC circuit, then Figure 2 The second diode D2 and the third diode D3 shown are silicon carbide fast recovery diodes.

[0056] It should be noted that silicon carbide semiconductor devices have high thermal conductivity. By incorporating new semiconductor devices such as silicon carbide fast recovery diodes into PFC circuits, the heat generated during operation can be reduced.

[0057] It should be noted that when electronic devices are powered on, the instantaneous connection of the input power generates a surge impact. This surge impact may damage components in the PFC circuit that are weak in resisting surge current, such as silicon carbide fast recovery diodes. Therefore, in order to ensure the stable operation of the PFC circuit, electronic devices need to be equipped with surge protection measures for the PFC circuit.

[0058] For example, the electronic device in this application embodiment further includes a pre-charging circuit, which is connected to the input terminal of the PFC circuit. The pre-charging circuit includes a positive temperature coefficient resistor and a switching device, which are respectively disposed between the input terminal of the electronic device and the input terminal of the PFC circuit.

[0059] Here, when the switching element is in the off state, the input power of the electronic device is supplied to the PFC circuit through the positive temperature coefficient resistor; when the switching element is in the on state, the positive temperature coefficient resistor is short-circuited by the switching element, and the input power of the electronic device is supplied to the PFC circuit through the on switching element.

[0060] Here, a positive temperature coefficient resistor is a typical temperature-sensitive semiconductor resistor. When the temperature of a positive temperature coefficient resistor exceeds the Curie temperature, the resistance of the positive temperature coefficient resistor increases in a stepwise manner with the increase of temperature. Based on the temperature sensitivity of the positive temperature coefficient resistor, it is usually connected to the protected circuit as an impact protection device.

[0061] Understandably, the pre-charging circuit serves as a surge protection measure for the PFC circuit. When surge protection is activated, a positive temperature coefficient resistor is connected to the input terminal of the PFC circuit, which limits the input current of the PFC circuit.

[0062] It is understandable that while a positive temperature coefficient (PTC) resistor connected to a PFC circuit can provide surge protection, it also generates heat loss, affecting the output efficiency of the PFC circuit. Therefore, electronic devices need to switch the PTC resistor connection status during operation. When the PFC circuit can provide stable power to the load, the PTC resistor is short-circuited to improve the output efficiency of the PFC circuit.

[0063] Here, in Figure 1 or Figure 2 In the electronic device shown, the pre-charge circuit includes a positive temperature coefficient resistor (PTC) and a switching element (RY1).

[0064] In some embodiments, the switching element of the pre-charging circuit is a relay. It is readily understood that relays are suitable for high-current power supply scenarios.

[0065] It should be noted that during the operation of the PFC circuit, as the switching state of the switching transistor changes, the inductor L repeatedly switches between charging and discharging states. When the inductor L is in the charging state, the input power of the load is provided by the filter capacitor C1 of the PFC circuit. Therefore, in order to ensure that the filter capacitor C1 can provide the power to maintain the operation of the load, the depleted filter capacitor C1 needs to be pre-charged before the PFC circuit supplies power to the load.

[0066] Understandably, during the pre-charge phase of the PFC circuit, the output voltage of the PFC circuit will be pulled down by the terminal voltage of the filter capacitor C1. Therefore, during the pre-charge phase of the PFC circuit, the electronic device needs to activate the surge protection and connect the positive temperature coefficient resistor to the PFC circuit for current limiting.

[0067] Based on this, in related technologies, the connection state of the positive temperature coefficient resistor is usually controlled based on the output voltage value of the PFC circuit. It is easy to understand that when the input voltage value of the PFC circuit is detected to be low, in order to avoid the input power supply from causing surge impact on the PFC circuit, the positive temperature coefficient resistor needs to be connected to the input terminal of the PFC circuit.

[0068] It should be noted that during the operation of electronic devices, a sudden power outage may occur, leading to a power interruption. In such a scenario, the input voltage of the PFC circuit drops rapidly after losing power, while the filter capacitor C1 at the output of the PFC circuit continues to discharge. Consequently, the output voltage of the PFC circuit drops slowly. In related technologies, if the connection state of the positive temperature coefficient resistor is controlled solely based on the output voltage value of the PFC circuit, the positive temperature coefficient resistor will not be quickly reconnected during a power interruption because the output voltage of the PFC circuit drops slowly. Therefore, the voltage difference between the input and output of the PFC circuit will increase significantly during the power interruption. A large voltage difference may damage components in the PFC circuit, such as silicon carbide fast recovery diodes, which have weak surge current resistance.

[0069] Based on this, the control method for electronic devices provided in this application aims to improve the surge current resistance of the PFC circuit of the electronic device.

[0070] For example, such as Figure 3 As shown, the control method for the electronic device in this application embodiment includes:

[0071] Step 301: Obtain the input voltage and output voltage values ​​of the PFC circuit.

[0072] Step 302: Based on the input voltage value and the output voltage value, control the connection state of the positive temperature coefficient resistor of the pre-charging circuit.

[0073] Here, the electronic device also includes a voltage acquisition circuit, and sets voltage sampling points at the input and output terminals of the PFC circuit. The voltage acquisition circuit is used to obtain the input voltage value and output voltage value of the PFC circuit based on the voltage sampling points.

[0074] In some embodiments, if the PFC circuit of the electronic device is a Boost PFC circuit, such as Figure 4 As shown, the first voltage sampling point is set at the input terminal of the rectifier module 1 to collect the input voltage of the PFC circuit, and the second voltage sampling point is set at the cathode of the first switching transistor D1, i.e. the positive output terminal of the PFC circuit, to collect the output voltage of the PFC circuit.

[0075] In some embodiments, if the PFC circuit of the electronic device is a Boost PFC circuit, such as Figure 5 As shown, the first voltage sampling point is set between the output terminal of the rectifier module 1 and the inductor L to collect the input voltage of the PFC circuit. The second voltage sampling point is set at the cathode of the first switching transistor D1, i.e. the positive output terminal of the PFC circuit, to collect the output voltage of the PFC circuit.

[0076] Here, rectifier module 1 is a bridge rectifier circuit.

[0077] It is understandable that the rectifier module 1 is only used to rectify the input AC power into DC power, and does not perform voltage regulation on the input AC power. Therefore, the first voltage sampling point is set at the input terminal of the rectifier module 1, or between the output terminal of the rectifier module 1 and the inductor L. The electrical signal collected by the first voltage sampling point can characterize the input voltage value of the PFC circuit.

[0078] In some embodiments, if the PFC circuit of the electronic device is a totem-pole PFC circuit, such as Figure 6 As shown, the first voltage sampling point is set between the pre-charging circuit and the inductor L to collect the input voltage of the PFC circuit. The second voltage sampling point is set between the cathode of the third diode D3 and the load, i.e., the positive output terminal of the PFC circuit, to collect the output voltage of the PFC circuit.

[0079] It should be noted that, Figures 4-6 The circuit structure of the electronic device shown is only a specific example of how to obtain the input voltage value and output voltage value of the PFC circuit in the embodiments of this application. The embodiments of this application do not specifically limit the method for obtaining the input voltage value and output voltage value of the PFC circuit.

[0080] For example, controlling the connection state of the positive temperature coefficient resistor of the pre-charging circuit includes: controlling the switching element of the pre-charging circuit to open, so that the positive temperature coefficient resistor of the pre-charging circuit is connected to the input terminal of the PFC circuit; or, controlling the switching element of the pre-charging circuit to turn on, so that the positive temperature coefficient resistor of the pre-charging circuit is short-circuited.

[0081] Here, the switching elements of the pre-charging circuit include relays.

[0082] It is understood that, in this embodiment of the application, the positive temperature coefficient resistor is switched between being connected to the PFC circuit and being short-circuited by controlling the on / off state of the switching element.

[0083] It should be noted that after an electronic device is powered on, the input voltage of the PFC circuit will rise significantly. However, if a power outage occurs during the operation of the electronic device, the input voltage of the PFC circuit will drop significantly. But because the output of the PFC circuit requires a filter capacitor C1 to supply power to the load, the output voltage of the PFC circuit will not respond quickly to changes in the input voltage. It is easy to understand that because there is a significant difference between the rate of change of the input and output voltages of the PFC circuit, if the surge protection is not activated during the operation of the PFC circuit, there may be a large voltage difference between the input and output terminals of the PFC circuit when the input voltage changes significantly. A large voltage difference may damage components in the PFC circuit that have weak surge current resistance.

[0084] It should be noted that, based on the input and output voltage values ​​of the PFC circuit, this embodiment can determine whether the voltage difference between the input and output terminals of the PFC circuit exceeds the surge current withstand capability of the PFC circuit. Furthermore, this embodiment controls the connection state of the positive temperature coefficient resistor based on the input and output voltage values ​​of the PFC circuit, ensuring that the positive temperature coefficient resistor is connected to the input terminal of the PFC circuit before the voltage difference exceeds its surge current withstand capability, thus preventing damage to the PFC circuit.

[0085] It is understood that, since the embodiments of this application control the connection state of the positive temperature coefficient resistor by determining the voltage difference between the input and output voltages of the PFC circuit, the PFC circuit uses devices with weak surge current resistance, such as silicon carbide fast recovery diodes, and will not malfunction or be damaged when the input voltage of the PFC circuit changes significantly.

[0086] It is understandable that the positive temperature coefficient resistor is used as an anti-surge protection measure for PFC circuits. In this application embodiment, the connection state of the positive temperature coefficient resistor is controlled by the input voltage value and output voltage value of the PFC circuit. This solves the problem that the anti-surge protection cannot be activated in time when the power supply is interrupted during the operation of the PFC circuit, and improves the anti-surge current capability of the PFC circuit of electronic devices.

[0087] For example, controlling the connection state of the positive temperature coefficient resistor of the pre-charging circuit based on the input voltage value and the output voltage value includes: determining that the input voltage value is less than a second voltage threshold for a second duration and the positive temperature coefficient resistor of the pre-charging circuit is in a short-circuited state, then connecting the positive temperature coefficient resistor to the input terminal of the PFC circuit.

[0088] Here, the PFC circuit does not need to activate the surge protection when providing stable power to the load, and the positive temperature coefficient resistor of the pre-charge circuit is in a short-circuited state.

[0089] Here, if a power outage occurs during the operation of the electronic device, the input voltage of the PFC circuit will continue to drop significantly. In this embodiment, it is determined that a power outage has occurred during the operation of the electronic device based on the fact that the input voltage value is less than the second voltage threshold for a second duration when the positive temperature coefficient resistor of the pre-charging circuit is in a short-circuited state.

[0090] It should be noted that if a power outage occurs during the operation of an electronic device, the input voltage of the PFC circuit will drop rapidly after power loss, while the output voltage of the PFC circuit will drop slowly. If surge protection is not activated, as the input voltage of the PFC circuit drops rapidly, the output voltage of the PFC circuit will be significantly higher than the input voltage. The large voltage difference between the input and output terminals of the PFC circuit may damage the PFC circuit. Therefore, in this embodiment, when the positive temperature coefficient resistor of the pre-charging circuit is in a short-circuited state, a power outage is determined based on the input voltage value of the PFC circuit being less than the second voltage threshold for a second duration. Then, the positive temperature coefficient resistor is connected to the input terminal of the PFC circuit in a timely manner to suppress the increasing trend of the voltage difference between the input and output terminals of the PFC circuit.

[0091] Here, in this embodiment of the application, after the input voltage value of the PFC circuit is less than the second voltage threshold during the second time period, the positive temperature coefficient resistor is connected to the input terminal of the PFC circuit to avoid accidentally connecting the positive temperature coefficient resistor to the input terminal of the PFC circuit when the input voltage fluctuates.

[0092] For example, the method further includes detecting the operating status of the load on the electronic device.

[0093] In some embodiments, determining that the input voltage value is less than a second voltage threshold for a second duration and the positive temperature coefficient resistor of the pre-charging circuit is in a short-circuited state, then connecting the positive temperature coefficient resistor to the input terminal of the PFC circuit includes: if the load is in a shutdown state, in response to determining that the input voltage value is less than the second voltage threshold for a second duration and the positive temperature coefficient resistor of the pre-charging circuit is in a short-circuited state, connecting the positive temperature coefficient resistor to the input terminal of the PFC circuit; and if the load is in an operating state, in response to determining that the input voltage value is less than the second voltage threshold for a second duration and the positive temperature coefficient resistor of the pre-charging circuit is in a short-circuited state, controlling the load to shut down, and connecting the positive temperature coefficient resistor to the input terminal of the PFC circuit after a third duration.

[0094] It is understood that this embodiment determines that a power outage occurs during the operation of the electronic device based on the input voltage value being less than the second voltage threshold for a second duration and the positive temperature coefficient resistor of the pre-charging circuit being in a short-circuited state. The output power of the PFC circuit cannot sustain the load for extended periods. To prevent a sudden power failure during load operation that could cause an input undervoltage fault, this embodiment also controls the load's operating state based on the input voltage value of the PFC circuit. Specifically, when the load is in a stopped state, a power outage of the electronic device will not cause an input undervoltage fault, so the surge protection is directly activated, and the positive temperature coefficient resistor is connected to the input terminal of the PFC circuit. When the load is in a working state, a power outage of the electronic device will cause an input undervoltage fault, so before activating the surge protection, the load powered by the PFC circuit is controlled to stop, and after a third duration, it is determined that the load has stopped before connecting the positive temperature coefficient resistor to the input terminal of the PFC circuit.

[0095] In some embodiments, controlling the connection state of the positive temperature coefficient resistor of the pre-charging circuit based on the input voltage value and the output voltage value further includes: if the load is in an operating state, then in response to the output voltage value being less than a third voltage threshold and the positive temperature coefficient resistor of the pre-charging circuit being short-circuited, controlling the load to stop, and connecting the positive temperature coefficient resistor to the input terminal of the PFC circuit after a third duration; and if the load is in a stopped state, in response to determining that the input voltage value is less than a second voltage threshold for a second duration and the positive temperature coefficient resistor of the pre-charging circuit is short-circuited, connecting the positive temperature coefficient resistor to the input terminal of the PFC circuit.

[0096] It is understood that in this embodiment, the connection of the positive temperature coefficient resistor can also be controlled based on the output voltage value of the PFC circuit when the load is working. Specifically, if the output voltage value is greater than or equal to the third voltage threshold, the output power supply of the PFC circuit can maintain the operation of the load; if the output voltage value is less than the third voltage threshold, the output power supply of the PFC circuit cannot maintain the operation of the load. At this time, the load is controlled to stop, and after it is determined that the load has stopped, the surge protection is activated, and the positive temperature coefficient resistor is connected to the input terminal of the PFC circuit.

[0097] It is understandable that controlling the connection of the positive temperature coefficient resistor based on the output voltage value of the PFC circuit when the load is working and controlling the connection of the positive temperature coefficient resistor based on the input voltage value of the PFC circuit when the load is stopped can prevent the load from being stopped erroneously due to voltage fluctuations in the input power supply of electronic devices.

[0098] For example, controlling the connection state of the positive temperature coefficient resistor of the pre-charging circuit based on the input voltage value and the output voltage value includes: determining that the output voltage value is greater than a first voltage threshold and the difference between the output voltage value and the input voltage value is less than a voltage difference threshold for a first time duration, and that the positive temperature coefficient resistor of the pre-charging circuit is in the connected state, then short-circuiting the positive temperature coefficient resistor.

[0099] Here, when the electronic device is powered on, the switching element of the pre-charge circuit is in the open state, and the positive temperature coefficient resistor is connected to the input terminal of the PFC circuit.

[0100] It should be noted that, considering that the input power supply will cause surge impact on the PFC circuit after the electronic device is powered on, the embodiment of this application controls the connection state of the positive temperature coefficient resistor based on the input voltage value and output voltage value of the PFC circuit. When the electronic device is powered on, since the output voltage value of the PFC circuit is less than the first voltage threshold, the positive temperature coefficient resistor is kept connected to the PFC circuit. As the PFC circuit charges the filter capacitor, when the electronic device exits the surge protection, although the input voltage of the PFC circuit will rise, the output voltage value of the PFC circuit is greater than the first voltage threshold. Even if the current flowing into the PFC circuit increases, it will not cause damage to the PFC circuit.

[0101] It should be noted that in this embodiment, the positive temperature coefficient resistor is quickly connected after the power supply to the electronic device is interrupted. When the electronic device is powered on again after the power supply interruption, if the power interruption period is short, the output voltage of the electronic device may still be greater than the first voltage threshold. If the connected positive temperature coefficient resistor is short-circuited in response to the output voltage of the electronic device being greater than the first voltage threshold for a first time, the output voltage of the PFC circuit may be significantly higher than the input voltage when the surge protection is deactivated. The large voltage difference between the input and output terminals of the PFC circuit may cause damage to the PFC circuit. Therefore, this embodiment controls the short-circuiting of the positive temperature coefficient resistor based on the output voltage value of the PFC circuit and the voltage difference between the input and output terminals.

[0102] It is understood that in this embodiment, when the electronic device is powered on again after a power outage, even if the output voltage of the PFC circuit drops slowly during the power outage, resulting in the output voltage value of the PFC circuit still being greater than the first voltage threshold upon power restoration, the input voltage of the PFC circuit drops rapidly during the power outage. Therefore, when the electronic device is powered on again, the difference between the output voltage value and the input voltage value of the PFC circuit is greater than or equal to the voltage difference threshold. Thus, the electronic device maintains the positive temperature coefficient resistor continuously connected and will not exit the surge protection. After the electronic device is powered on again, as the input voltage of the PFC circuit rises, if the difference between the output voltage value and the input voltage value of the PFC circuit is less than the voltage difference threshold for a first duration, it is determined that the voltage difference between the input and output terminals of the PFC circuit will not cause damage to the PFC circuit. In this case, combined with the fact that the output voltage value of the PFC circuit is greater than the first voltage threshold, the positive temperature coefficient resistor is short-circuited to improve the output efficiency of the PFC circuit, and the electronic device resumes normal operation.

[0103] In one application example of this application, the electronic device is an air conditioner, and the PFC circuit of the electronic device is used to power the intelligent power module (IPM) of the air conditioner's compressor and fan; in this example, a control method for the electronic device is also provided, such as... Figure 7 As shown, it includes:

[0104] Step 701: Power on the air conditioner and obtain the input voltage and output voltage values ​​of the PFC circuit.

[0105] Here, the input voltage of the air conditioner is AC220V.

[0106] Here, the PFC circuit of the air conditioner is a Boost PFC circuit.

[0107] Here, when the air conditioner is powered on, the switching element of the pre-charging circuit is in the open state.

[0108] The switching element of the pre-charging circuit is a relay.

[0109] The PFC circuit includes a silicon carbide fast recovery diode.

[0110] Step 702: Determine whether a user start command has been received, and whether the output voltage value is greater than the first voltage threshold and the difference between the output voltage value and the input voltage value is less than the voltage difference threshold within the first time period. If yes, proceed to step 703; otherwise, proceed to step 711.

[0111] Here, the user's startup command can be either a power-on command or a warm-up command.

[0112] Here, the first duration is 2 seconds.

[0113] Here, the voltage difference threshold is set to 10V.

[0114] Here, the first voltage threshold is DC100V.

[0115] Step 703: Control the switching element of the pre-charging circuit to turn on, and control the compressor and fan to work.

[0116] Here, based on the fact that the output voltage value is greater than the first voltage threshold within the first time period, it can be determined that the current flowing into the PFC circuit after the surge protection is deactivated will not cause damage to the PFC circuit.

[0117] Here, based on the fact that the difference between the output voltage and the input voltage is less than the voltage difference threshold within the first time period, it can be determined that after the surge protection is deactivated, the voltage difference between the input and output terminals of the PFC circuit will not cause damage to the PFC circuit.

[0118] Step 704: Determine whether a user shutdown command has been received. If yes, proceed to step 708; otherwise, proceed to step 705.

[0119] Here, after receiving the user's shutdown command, the air conditioner controls the compressor to stop.

[0120] Step 705: Determine whether the compressor or fan is in operation. If yes, proceed to step 706; otherwise, proceed to step 707.

[0121] Step 706: Determine whether the output voltage value is less than the third voltage threshold. If yes, proceed to step 710; otherwise, proceed to step 703.

[0122] Here, the third voltage threshold is DC135V.

[0123] Here, based on the fact that the output voltage value is less than the third voltage threshold, it can be determined that the air conditioner has experienced a power outage.

[0124] Step 707: Determine whether the input voltage value is less than the second voltage threshold within the second time period. If yes, proceed to step 711; otherwise, proceed to step 703.

[0125] Here, the second duration is 100ms.

[0126] Here, based on the fact that the input voltage value is less than the second voltage threshold within the second time period, it can be determined that the air conditioner has experienced a power outage.

[0127] Step 708: Determine if the shutdown time has reached the fourth duration. If yes, proceed to step 711; otherwise, proceed to step 709.

[0128] Here, the fourth duration is 2 minutes and 30 seconds.

[0129] Step 709: Determine whether the input voltage value is less than the second voltage threshold within the second time period. If yes, proceed to step 710; otherwise, proceed to step 708.

[0130] Here, the second duration is 100ms.

[0131] Here, based on the fact that the input voltage value is less than the second voltage threshold within the second time period, it can be determined that the air conditioner has experienced a power outage.

[0132] Step 710: Control the compressor and / or fan to stop and delay for a third duration.

[0133] Here, before activating the shock protection, it is necessary to control the load to stop.

[0134] Here, if step 706 is completed and then step 710 is executed, the compressor and fan are stopped and the delay is extended to the third duration; if step 709 is completed and then step 710 is executed, the fan is stopped and the delay is extended to the third duration.

[0135] Here, the third duration is 1 second.

[0136] Step 711: Control the switching element of the pre-charge circuit to disconnect.

[0137] Here, when the air conditioner is not started, the switching element controlling the pre-charging circuit is disconnected.

[0138] Here, after a power outage occurs in the air conditioner, the surge protection is activated to prevent excessive voltage difference between the input and output terminals of the PFC circuit, which could damage the PFC circuit.

[0139] Here, after step 707 is completed, step 702 is executed.

[0140] In order to implement the method of the embodiments of this application, the embodiments of this application also provide a control device for an electronic device, which corresponds to the control method described above, and the steps in the embodiments of the control method described above are also fully applicable to the embodiments of this control device.

[0141] like Figure 8 As shown, the control device of the electronic device in this embodiment includes an acquisition module 801 and a control module 802. The acquisition module 801 is used to acquire the input voltage value and the output voltage value of the PFC circuit; the control module 802 is used to control the connection state of the positive temperature coefficient resistor of the pre-charging circuit based on the input voltage value and the output voltage value.

[0142] In some embodiments, the control module 802 is specifically used to: determine that the output voltage value is greater than a first voltage threshold and the difference between the output voltage value and the input voltage value is less than a voltage difference threshold for a first duration, and that the positive temperature coefficient resistor of the pre-charging circuit is in the connected state, then short-circuit the positive temperature coefficient resistor.

[0143] In some embodiments, the control module 802 is specifically used to: determine that the input voltage value is less than the second voltage threshold for a second duration and the positive temperature coefficient resistor of the pre-charging circuit is in a short-circuited state, then connect the positive temperature coefficient resistor to the input terminal of the PFC circuit.

[0144] In some embodiments, the acquisition module 801 is further configured to: detect the operating status of the load of the electronic device.

[0145] In some embodiments, the control module 802 is specifically configured to: if the load is in a shutdown state, in response to determining that the input voltage value is less than the second voltage threshold for a second duration and the positive temperature coefficient resistor of the pre-charging circuit is in a short-circuited state, connect the positive temperature coefficient resistor to the input terminal of the PFC circuit.

[0146] In some embodiments, the control module 802 specifically controls the load to stop if the load is in operation, in response to determining that the input voltage value is less than the second voltage threshold for a second duration and the positive temperature coefficient resistor of the pre-charging circuit is in a short-circuited state, and connects the positive temperature coefficient resistor to the input terminal of the PFC circuit after a third duration.

[0147] In some embodiments, the control module 802 is further configured to: control the switching element of the pre-charging circuit to open, so that the positive temperature coefficient resistor of the pre-charging circuit is connected to the input terminal of the PFC circuit; or, control the switching element of the pre-charging circuit to turn on, so that the positive temperature coefficient resistor of the pre-charging circuit is short-circuited.

[0148] It should be noted that the control device for the electronic device provided in the above embodiments is only illustrated by the division of the above program modules. In practical applications, the above processing can be assigned to different program modules as needed, that is, the internal structure of the device can be divided into different program modules to complete all or part of the processing described above. In addition, the control device and control method embodiments provided in the above embodiments belong to the same concept, and the specific implementation process can be found in the method embodiments, which will not be repeated here.

[0149] Based on the hardware implementation of the above program modules, and in order to implement the control method of the electronic device in the embodiments of this application, the embodiments of this application also provide an electronic device, such as... Figure 9As shown, electronic device 900 includes at least one processor 901, memory 902, user interface 903, and at least one network interface 904. The various components in electronic device 900 are coupled together via bus system 905. It can be understood that bus system 905 is used to implement communication between these components. In addition to a data bus, bus system 905 also includes a power bus, a control bus, and a status signal bus. However, for clarity, in… Figure 9 The general labeled all buses as Bus System 905.

[0150] The user interface 903 may include a monitor, keyboard, mouse, trackball, click wheel, buttons, touchpad, or touch screen.

[0151] The memory 902 in this embodiment is used to store various types of data to support the operation of the electronic device 900. Examples of such data include any computer program used to operate on the electronic device 900.

[0152] The embodiments of this application disclose methods applicable to or implemented by processor 901. Processor 901 may be an integrated circuit chip with signal processing capabilities. During implementation, the steps provided in the embodiments of this application can be completed by integrated logic circuits in the hardware of processor 901 or by instructions in software form. The processor 901 described above may be a general-purpose processor, a digital signal processor (DSP), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Processor 901 can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. A general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the methods disclosed in the embodiments of this application can be directly manifested as execution by a hardware decoding processor, or execution by a combination of hardware and software modules in the decoding processor. The software modules may be located in a storage medium, specifically memory 902. Processor 901 reads information from memory 902 and, in conjunction with its hardware, completes the steps provided in the embodiments of this application.

[0153] In some embodiments, the processor 901 is preferably a microcontroller unit (MCU).

[0154] In an exemplary embodiment, the electronic device 900 may be implemented by one or more application-specific integrated circuits (ASICs), DSPs, programmable logic devices (PLDs), complex programmable logic devices (CPLDs), FPGAs, general-purpose processors, controllers, microcontrollers (MCUs), microprocessors, or other electronic components to perform the aforementioned method.

[0155] It is understood that memory 902 can be volatile memory or non-volatile memory, or both. Non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), EEPROM, ferromagnetic random access memory (FRAM), flash memory, magnetic surface memory, optical disc, or compact disc read-only memory (CD-ROM); magnetic surface memory can be disk storage or magnetic tape storage. Volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Synchronous Static Random Access Memory (SSRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), Double Data Rate Synchronous Dynamic Random Access Memory (DDRSDRAM), Enhanced Synchronous Dynamic Random Access Memory (ESDRAM), Sync Link Dynamic Random Access Memory (SLDRAM), and Direct Rambus Random Access Memory (DRRAM). The memory 902 described in this application embodiment is intended to include, but is not limited to, these and any other suitable types of memory.

[0156] Here, electronic device 900 also includes Figures 4-6The PFC circuit shown in the figure and the pre-charge circuit connected to the input terminal of the PFC circuit.

[0157] In some embodiments, electronic device 900 is an air conditioner.

[0158] In some embodiments, the processor 901 of the electronic device 900 includes a voltage acquisition circuit 2.

[0159] In some embodiments, the electronic device 900 further includes a voltage acquisition circuit 2, and a processor 901 is connected to the voltage acquisition circuit 2. The processor 901 acquires the input voltage value and output voltage value of the PFC circuit based on the voltage acquisition circuit 2.

[0160] In some embodiments, the electronic device 900 further includes a driving device (not shown in the figure), which is connected to the driving terminals of the switching transistors of the PFC circuit, and the processor 901 controls the on / off state of the switching transistors based on the driving device.

[0161] In an exemplary embodiment, this application also provides a storage medium, namely a computer storage medium, specifically a computer-readable storage medium, such as a memory 902 that stores a computer program. This computer program can be executed by the processor 901 of the electronic device 900 to complete the steps described in the control method of the electronic device of this application. The computer-readable storage medium can be a ROM, PROM, EPROM, EEPROM, Flash Memory, magnetic surface memory, optical disc, or CD-ROM, etc.

[0162] In an exemplary embodiment, this application also provides a computer program product, including a computer program that can be executed by a processor 901 of an electronic device 900 to perform the steps described in the method of this application embodiment.

[0163] It should be noted that terms such as "first" and "second" are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0164] Furthermore, the technical solutions described in the embodiments of this application can be combined arbitrarily without conflict.

[0165] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A control method for an electronic device, characterized in that, The electronic device includes a power factor correction (PFC) circuit and a pre-charge circuit connected to the input of the PFC circuit; the method includes: Obtain the input voltage and output voltage values ​​of the PFC circuit; Based on the input voltage value and the output voltage value, the connection state of the positive temperature coefficient resistor of the pre-charging circuit is controlled.

2. The method according to claim 1, characterized in that, The step of controlling the connection state of the positive temperature coefficient resistor in the pre-charging circuit based on the input voltage value and the output voltage value includes: If it is determined that the output voltage value is greater than the first voltage threshold and the difference between the output voltage value and the input voltage value is less than the voltage difference threshold for a first duration, and the positive temperature coefficient resistor of the pre-charging circuit is in the connected state, then the positive temperature coefficient resistor is short-circuited.

3. The method according to claim 1, characterized in that, The step of controlling the connection state of the positive temperature coefficient resistor in the pre-charging circuit based on the input voltage value and the output voltage value includes: If it is determined that the input voltage value is less than the second voltage threshold for a second duration and the positive temperature coefficient resistor of the pre-charging circuit is in a short-circuited state, then the positive temperature coefficient resistor is connected to the input terminal of the PFC circuit.

4. The method according to claim 3, characterized in that, The method further includes: Detect the operating status of the electronic device under load; The step of determining that the input voltage value is less than the second voltage threshold for a second duration and the positive temperature coefficient resistor of the pre-charging circuit is in a short-circuited state, and then connecting the positive temperature coefficient resistor to the input terminal of the PFC circuit, includes: If the load is in a shutdown state, in response to determining that the input voltage value is less than the second voltage threshold for a second duration and the positive temperature coefficient resistor of the pre-charging circuit is in a short-circuited state, the positive temperature coefficient resistor is connected to the input terminal of the PFC circuit.

5. The method according to claim 4, characterized in that, The step of determining that the input voltage value is less than the second voltage threshold for a second duration and the positive temperature coefficient resistor of the pre-charging circuit is in a short-circuited state, and then connecting the positive temperature coefficient resistor to the input terminal of the PFC circuit, includes: If the load is in operation, in response to determining that the input voltage value is less than the second voltage threshold for a second duration and the positive temperature coefficient resistor of the pre-charging circuit is in a short-circuited state, the load is controlled to stop, and after a third duration, the positive temperature coefficient resistor is connected to the input terminal of the PFC circuit.

6. The method according to any one of claims 1 to 5, characterized in that, The control of the connection state of the positive temperature coefficient resistor in the pre-charging circuit includes: The switching element of the pre-charge circuit is turned off, so that the positive temperature coefficient resistor of the pre-charge circuit is connected to the input terminal of the PFC circuit; or, The switching element of the pre-charge circuit is turned on, so that the positive temperature coefficient resistor of the pre-charge circuit is short-circuited.

7. A control device for an electronic device, characterized in that, The electronic device includes a PFC circuit and a pre-charging circuit connected to the input terminal of the PFC circuit. The control device includes: The acquisition module is used to acquire the input voltage value and output voltage value of the PFC circuit; The control module is used to control the connection state of the positive temperature coefficient resistor of the pre-charging circuit based on the input voltage value and the output voltage value.

8. An electronic device, characterized in that, The electronic device includes a PFC circuit and a pre-charging circuit connected to the input terminal of the PFC circuit; the electronic device also includes: A processor, which, when running a computer program, performs the steps of the method according to any one of claims 1 to 6.

9. The electronic device according to claim 8, characterized in that, The PFC circuit is a Boost PFC circuit, and a fast recovery diode is provided at the output terminal of the Boost PFC circuit.

10. The electronic device according to claim 8, characterized in that, The PFC circuit is a totem pole PFC circuit, and a fast recovery diode is provided on the rectifier bridge arm of the totem pole PFC circuit.

11. A computer storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

12. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

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