Power supply device, control method thereof, apparatus, storage medium, and product

Abstract

The invention discloses a power supply device, a control method thereof, equipment, a storage medium and a product. The power supply device comprises a rectifier module, a first Boost module, a first thin-film capacitor and a second thin-film capacitor. The rectification module is used for rectifying an external AC power supply into a DC signal which is used for supplying power to a load. The power supply end of the first Boost module is connected with the output end of the rectifier module, and the output end of the first Boost module is connected with a load; the first thin-film capacitor is arranged between the output end of the rectifier module and the power supply end of the first Boost module; and the second thin-film capacitor is arranged between the output end of the rectifier module and the load and is used for filtering the direct-current electric signal. The direct current signal is also used for charging the first thin-film capacitor; the first film capacitor is used for supplying power to the load through the first Boost module when the voltage value of the direct current signal is smaller than a first set voltage value. The thin-film capacitor with the long service life is adopted to replace an electrolytic capacitor with the short service life, and the service life of the power supply device is prolonged.

Description

Technical Field

[0001] The present application relates to power conversion technology, and in particular to a power supply device and a control method, equipment, storage medium and product thereof. Background Art

[0002] The rectifier power supply device generally includes a rectifier module and a filter module. The rectifier module is used to rectify the AC power supply into a DC signal, and the filter module is used to filter the DC signal to smooth the voltage of the filtered DC signal.

[0003] In the related art, the filter module usually uses a filter capacitor for filtering. When the voltage of the DC signal is high, the DC signal supplies power to the load and charges the filter capacitor. When the voltage of the DC signal is low, the filter capacitor discharges the load, so that the input voltage of the load will not be significantly reduced as the voltage of the DC signal changes. In order to ensure that the input voltage of the load fluctuates less, the filter capacitor usually uses a large-capacitance electrolytic capacitor. However, the service life of the electrolytic capacitor is usually short and is easily affected by the use environment and accelerates aging. Therefore, the short actual service life of the electrolytic capacitor will affect the service life of the rectifier power supply device. Summary of the invention

[0004] In view of this, the embodiments of the present application provide a power supply device and a control method, device, storage medium and product thereof, aiming to improve the actual service life of the rectifier power supply device.

[0005] The technical solution of the embodiment of the present application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a power supply device, the power supply device comprising:

[0007] A rectifier module, used to rectify an external AC power supply into a DC signal, and the DC signal is used to supply power to a load;

[0008] A first boost module, wherein a power supply end of the first boost module is connected to an output end of the rectifier module, and an output end of the first boost module is connected to the load;

[0009] A first film capacitor is arranged between the output end of the rectifier module and the power supply end of the first Boost module;

[0010] A second thin film capacitor is provided between the output end of the rectifier module and the load, and is used for filtering the DC signal;

[0011] The DC signal is also used to charge the first film capacitor; the first film capacitor is used to discharge the load via the first Boost module when the voltage value of the DC signal is less than a first set voltage value.

[0012] In some embodiments, the first Boost module includes:

[0013] A first inductor, wherein an input end of the first inductor is respectively connected to an output end of the rectifier module and the first film capacitor;

[0014] A first switch tube, wherein an input end of the first switch tube is connected to an output end of the first inductor, and an output end of the first switch tube is connected to a ground end;

[0015] A first diode, wherein an anode of the first diode is connected to the output end of the first inductor, and a cathode of the first diode is connected to the load.

[0016] In some embodiments, the rectifier module is a boost power factor correction (Boost Power Factor Correction, Boost PFC) module, including a bridge rectifier module and a second Boost module, and the rectifier module is also used to improve the power factor of the external AC power supply.

[0017] In some embodiments, the second Boost module includes:

[0018] A second inductor, an input end of which is connected to the bridge rectifier module;

[0019] A second switch tube, wherein an input end of the second switch tube is connected to an output end of the second inductor, and an output end of the second switch tube is connected to a ground end;

[0020] A second diode, wherein an anode of the second diode is connected to the output end of the second inductor, and a cathode of the second diode is connected to the load.

[0021] In some embodiments, the power supply device further comprises:

[0022] A third diode, wherein an anode of the third diode is connected to the output end of the rectifier module, and a cathode of the third diode is respectively connected to the power supply end of the first Boost module and the first film capacitor.

[0023] In a second aspect, an embodiment of the present application provides a control method for the power supply device according to the first aspect, the method comprising:

[0024] Acquiring a voltage value of the direct current signal;

[0025] When it is determined that the voltage value of the direct current signal is less than the first set voltage value, the first Boost module is controlled to start.

[0026] In some embodiments, the first Boost module includes a first switch tube, and controlling the first Boost module to start includes:

[0027] Based on a first duty cycle, the first switch tube is controlled to operate.

[0028] In some embodiments, the method further comprises:

[0029] Obtaining a voltage value across the first film capacitor;

[0030] When it is determined that the voltage value across the first film capacitor reaches a second set voltage value, controlling the first Boost module to stop running;

[0031] The step of controlling the first Boost module to stop running includes:

[0032] The first switch tube is controlled to be cut off.

[0033] In some embodiments, the rectifier module is a Boost PFC module, the rectifier module includes a second switch tube, and the method further includes:

[0034] Based on the second duty cycle, the second switch tube is controlled to operate.

[0035] In a third aspect, an embodiment of the present application provides an electronic device, the electronic device comprising the power supply device as described in the first aspect, the electronic device further comprising a controller, wherein:

[0036] The controller is used to execute the steps of the method described in the second aspect when running a computer program.

[0037] In a fourth aspect, an embodiment of the present application provides a storage medium having a computer program stored thereon. When the computer program is executed by a controller, the steps of the method described in the second aspect are implemented.

[0038] In a fifth aspect, an embodiment of the present application provides a computer program product, including a computer program, which, when executed by a controller, implements the steps of the method described in the second aspect.

[0039] The power supply device provided in the embodiment of the present application includes: a rectifier module, a first Boost module, a first film capacitor and a second film capacitor. The rectifier module is used to rectify the external AC power supply into a DC signal, and the DC signal is used to supply power to the load; the power supply end of the first Boost module is connected to the output end of the rectifier module, and the output end of the first Boost module is connected to the load; the first film capacitor is arranged between the output end of the rectifier module and the power supply end of the first Boost module; the second film capacitor is arranged between the output end of the rectifier module and the load, and is used to filter the DC signal. The DC signal is also used to charge the first film capacitor; the first film capacitor is used to supply power to the load through the first Boost module when the voltage value of the DC signal is less than the first set voltage value. The power supply device of the embodiment of the present application is provided with a first film capacitor and a first Boost module. When the voltage of the DC signal output by the rectifier module is high, the DC signal charges the first film capacitor; when the rectifier module cuts off the output, the first film capacitor is discharged to the load after being boosted by the first Boost module. In this way, a film capacitor with a smaller capacity is used as a filter capacitor. When the voltage of the DC signal is low, since the first film capacitor continuously discharges to the load, the input voltage of the load will not be significantly reduced due to the small capacity of the filter capacitor, and the first film capacitor is discharged after being boosted by the first Boost module, and the power supply device has a lower capacity requirement for the first film capacitor. The embodiment of the present application uses a film capacitor with a longer service life to replace a large-capacity electrolytic capacitor with a shorter service life, thereby increasing the actual service life of the power supply device. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic diagram of the structure of a power supply device according to an embodiment of the present application;

[0041] Figure 2 This is a schematic diagram of the structure of a power supply device according to another embodiment of the present application;

[0042] Figure 3 This is a structural schematic diagram of a power supply device according to another embodiment of the present application;

[0043] Figure 4 A schematic diagram of a flow chart of a control method of a power supply device according to an embodiment of the present application;

[0044] Figure 5 This is a structural schematic diagram of a power supply device in an application example of the present application;

[0045] Figure 6 This is a voltage timing diagram of each thin film capacitor and switch tube in a power supply device in an application example of the present application. DETAILED DESCRIPTION

[0046] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0048] The present application embodiment provides a power supply device, such as Figure 1 As shown, it includes: a rectifier module 100, a first Boost module 200, a first film capacitor C1 and a second film capacitor C2. The rectifier module 100 is used to rectify the external AC power supply 300 into a DC signal, and the DC signal is used to power the load 400. The power supply end of the first Boost module 200 is connected to the output end of the rectifier module 100, and the output end of the first Boost module 200 is connected to the load 400. The first film capacitor C1 is arranged between the output end of the rectifier module 100 and the power supply end of the first Boost module 200. The second film capacitor C2 is arranged between the output end of the rectifier module 100 and the load 400, and is used to filter the DC signal. Among them, the DC signal is also used to charge the first film capacitor C1. The first film capacitor C1 is used to discharge the DC signal to the load 400 through the first Boost module 200 when the voltage value of the DC signal is less than the first set voltage value.

[0049] Here, the power supply device of the embodiment of the present application is a rectifier power supply device.

[0050] It should be noted that the rectifier power supply device includes a rectifier module, which is used to rectify the external AC power supply into a DC signal. The rectifier module can be divided into a half-wave rectifier module, a full-wave rectifier module, a bridge rectifier module, etc. according to the rectification method. The rectifier module can be divided into a PFC module and a non-PFC rectifier module according to whether it has a power factor correction function. Since the DC signal output by the rectifier module contains an AC component, the voltage output by the rectifier power supply device without a filter module fluctuates greatly. When the voltage is low, the output capacity of the rectifier power supply device is insufficient, and the output electrical signal is easy to resonate with the external AC power supply and emit beat frequency electromagnetic noise. Therefore, the rectifier power supply device is usually also provided with a filter module for filtering the DC signal output by the rectifier module, so that the voltage output by the rectifier power supply device tends to be stable.

[0051] Here, the filter module includes a filter capacitor, and the charge and discharge capabilities of the filter capacitor are used to eliminate the AC component in the DC signal to ensure the stable power supply capability to the load when the voltage of the DC signal is low. In the embodiment of the present application, the second film capacitor C2 is used as a filter capacitor, which is arranged at both ends of the load 400 to filter the DC signal output by the rectifier module 100.

[0052] It can be understood that the rectifier module is used to change the voltage polarity. As the voltage of the external AC power supply changes periodically, the voltage of the DC signal output by the rectifier module changes periodically. When the voltage of the external AC power supply is high, the voltage of the DC signal is higher than the voltage across the filter capacitor. At this time, the DC signal charges the filter capacitor while supplying power to the load; when the voltage of the external AC power supply is low, since the voltage drop rate of the DC signal is faster than the discharge rate of the filter capacitor, if the voltage of the DC signal output by the rectifier module is lower than the voltage across the filter capacitor, the rectifier module cuts off the output and the filter capacitor discharges to the load.

[0053] It should be noted that in the related art, due to the characteristics of large capacitance of electrolytic capacitors, electrolytic capacitors are usually used as filter capacitors in rectifier power supply devices. When the electrolytic capacitor is used as a filter capacitor to discharge the load, the voltage drop rate of the two ends of the electrolytic capacitor is slow, the output voltage of the rectifier power supply device is stable, and the filtering effect is good. However, since the service life of the electrolytic capacitor is short and the aging rate is easily affected by the use environment, and the rectifier power supply device is usually unable to replace the aged filter capacitor separately, the actual service life of the electrolytic capacitor will directly affect the actual service life of the rectifier power supply device; if the rectifier power supply device is not provided with an electrolytic capacitor for filtering, although the service life of the rectifier power supply device can be improved, it will affect the output capacity of the rectifier power supply device, making the application conditions of the rectifier power supply device harsh.

[0054] It should be noted that the filter capacitor of the power supply device of the embodiment of the present application is the second film capacitor C2. Compared with electrolytic capacitors, film capacitors have the advantages of high withstand voltage, long life and high reliability. Using film capacitors to replace electrolytic capacitors can increase the actual service life of the power supply device. However, the capacitance of the film capacitor is relatively small. If a film capacitor is used to filter a DC signal, when the film capacitor discharges the load, the voltage at both ends of the film capacitor drops quickly, and the filtering effect is poor. Although the actual service life of the power supply device can be increased, it will also affect the output capacity of the power supply device.

[0055] Based on this, the power supply device of the embodiment of the present application not only uses the second film capacitor C2 as a filter capacitor, but also includes a first film capacitor C1. The first film capacitor C1 is arranged at the output end of the rectifier module 100. When the voltage of the external AC power supply 300 is high, the rectifier module 100 outputs a DC signal. While the DC signal supplies power to the load 400, it also charges the first film capacitor C1. The first film capacitor C1 is connected to the load 400 via the first Boost module 200. When the voltage of the external AC power supply 300 is low, if the voltage value of the DC signal is lower than the first set voltage value, the first film capacitor C1 uses the pre-stored electric energy to discharge the load 400, which solves the problem that when the voltage of the external AC power supply 300 is low, the second film capacitor C2 discharges the load 400 alone, resulting in insufficient output capacity of the power supply device.

[0056] Among them, considering that the capacitance of the first film capacitor C1 is relatively small, when the voltage of the external AC power supply 300 is low, the first film capacitor C1 provides compensation power to the load 400, and the voltage across the first film capacitor C1 drops faster. Therefore, in the embodiment of the present application, the first film capacitor C1 supplies power to the load 400 after being boosted by the first Boost module 200 to reduce the capacitance requirement of the first film capacitor C1.

[0057] For example, Figure 2 As shown, the first Boost module 200 includes: a first inductor L1, a first switch tube Q1 and a first diode D1. The input end of the first inductor L1 is connected to the output end of the rectifier module 100 and the first film capacitor C1 respectively. The input end of the first switch tube Q1 is connected to the output end of the first inductor L1, and the output end of the first switch tube Q1 is connected to the ground end. The anode of the first diode D1 is connected to the output end of the first inductor L1, and the cathode of the first diode D1 is connected to the load 400.

[0058] It can be understood that if the first switch tube Q1 is turned on, the first film capacitor C1 discharges the first inductor L1, and the first inductor L1 stores energy; if the first switch tube Q1 is turned off, the first film capacitor C1 and the first inductor L1 jointly discharge the load 400 and the second film capacitor C2, and the voltage output by the first Boost module 200 is higher than the voltage across the first film capacitor C1. When it is determined that the voltage value of the DC signal is less than the first set voltage value, the embodiment of the present application starts the first Boost module 200, and based on controlling the continuous switching of the first switch tube Q1, the first film capacitor C1 is realized to discharge the load 400 by boosting the voltage.

[0059] Furthermore, the relationship between the switch duty cycle, input voltage and output voltage of the Boost module is shown in the following formula:

[0060]

[0061] Where D is the duty cycle of the switch, V IN is the input voltage of the Boost module, V OUT is the input voltage of the Boost module.

[0062] It can be understood that in the first Boost module 200, V IN is the voltage across the first film capacitor C1, V OUT is the input voltage of the load 400. During the discharge process of the first film capacitor C1, if the voltage across the first film capacitor C1 drops rapidly, the input voltage of the load 400 can be kept stable by increasing the duty cycle of the first switch tube Q1.

[0063] It can be understood that the embodiment of the present application takes into account the insufficient filtering capacity of the second film capacitor C2, and adds the first film capacitor C1 and the first Boost module 200 to compensate for the insufficient output capacity of the power supply device. When the first film capacitor C1 discharges the load 400, the power supply device can achieve stable power supply to the load 400 by adjusting the duty cycle of the first switch tube Q1 of the first Boost module 200. Therefore, the embodiment of the present application adopts the first film capacitor C1 with smaller capacitance to compensate for the power supply to the load 400. The output capacity of the power supply device is not affected by the voltage fluctuation of the external AC power supply and the discharge capacity of the first film capacitor C1, and there is no electrolytic capacitor in the power supply device, which improves the actual service life of the power supply device.

[0064] Exemplarily, the power supply device further includes: a third diode D3. The anode of the third diode D3 is connected to the output end of the rectifier module 100, and the cathode of the third diode D3 is connected to the power supply end of the first Boost module 200 and the first film capacitor C1 respectively.

[0065] It is understandable that the power supply device sets a third diode D3 between the output end of the rectifier module 100 and the first film capacitor C1. The third diode D2 plays a reverse cutoff role to prevent the first film capacitor C1 from discharging to the rectifier module 100 when the voltage at the output end of the rectifier module 100 is low.

[0066] For example, Figure 3 As shown, the rectifier module 100 is a Boost PFC module, including a bridge rectifier module 101 and a second Boost module 102 . The rectifier module 100 is also used to improve the power factor of the external AC power source 300 .

[0067] Exemplarily, the second Boost module 102 includes: a second inductor L2, a second switch tube Q2, and a second diode D2. The input end of the second inductor L2 is connected to the bridge rectifier module 101. The input end of the second switch tube Q2 is connected to the output end of the second inductor L2, and the output end of the second switch tube Q2 is connected to the ground end. The anode of the second diode D2 is connected to the output end of the second inductor L2, and the cathode of the second diode D2 is connected to the load 400.

[0068] Here, the rectifier module 100 is preferably a Boost PFC module, the bridge rectifier module 101 is used to rectify the external AC power supply 300, and the second Boost module 102 is similar to the first Boost module 200 in principle. Based on controlling the continuous opening and closing of the second switch tube Q2, the bridge rectifier module 101 boosts and discharges the load 400, and the voltage of the DC signal output by the rectifier module 100 is higher than the voltage of the external AC power supply 300.

[0069] It can be understood that when the voltage of the DC signal is higher than the voltage across the second film capacitor C2, the bridge rectifier circuit 101 outputs, and the rectifier module 100 is preferably a Boost PFC module, which achieves that within the voltage cycle of the external AC power supply 300, the time during which the voltage of the DC signal is higher than the voltage across the second film capacitor C2 is extended, the current and voltage waveforms of the external AC power supply 300 are improved, and the power factor of the external AC power supply 300 is improved.

[0070] In addition, the rectifier module 100 is preferably a Boost PFC module, which can extend the power supply time of the DC signal output by the rectifier module 100 to the load 400, thereby shortening the discharge time of the first thin film capacitor C1 and the second thin film capacitor C2 to the load 400, and further reducing the power supply device's capacitance requirements for the first thin film capacitor C1 and the second thin film capacitor C2.

[0071] The present application also provides a control method for the aforementioned power supply device, such as Figure 4 As shown, the method includes:

[0072] Step 401, obtaining the voltage value of the direct current signal.

[0073] Step 402: When it is determined that the voltage value of the DC signal is less than the first set voltage value, the first Boost module is controlled to start.

[0074] It should be noted that the filtering effect of the second film capacitor C2 of the power supply device of the embodiment of the present application is poor. When the voltage of the external AC power supply 300 is low, it is impossible to maintain the input voltage stability of the load 400 by discharging the second film capacitor C2 to the load 400. Therefore, when the voltage value of the current DC signal is less than the first set voltage value, the first Boost module 200 is started, and the first film capacitor C1 is discharged to the load 400 after being boosted by the first Boost module to compensate for the insufficient discharge capacity of the second film capacitor.

[0075] Here, the first set voltage value may be determined based on the voltage value of the external AC power source 300 , the capacitance of the second film capacitor C2 , and the output voltage range of the power supply device.

[0076] In an application example of the present application, since the capacitance of the second film capacitor C2 is relatively small, the filtering capability of the second film capacitor C2 is ignored, and the first set voltage value is specifically:

[0077]

[0078] Among them, U1 is the first set voltage value, U min is the minimum output voltage limit of the power supply device, U inrms is the effective value of the voltage of the external AC power source 300.

[0079] Exemplarily, the first Boost module 200 includes a first switch tube Q1 , and controlling the first Boost module 200 to start up includes: controlling the first switch tube Q1 to operate based on a first duty cycle.

[0080] It is understandable that after the first Boost module 200 is started, the first switch tube Q1 is controlled to be continuously turned on and off. When the first switch tube Q1 is turned on, the first inductor L1 stores energy; when the first switch tube Q1 is turned off, the first film capacitor C1 and the first inductor L1 jointly discharge the load 400.

[0081] Here, since the capacitance of the first film capacitor C1 is relatively small, the voltage across the first film capacitor C1 may drop significantly during the discharge process of the first film capacitor C1. Therefore, during the discharge process of the first film capacitor C1, the first duty cycle continues to increase to maintain a stable input voltage of the load 400.

[0082] Exemplarily, the method further includes: obtaining a voltage value across the first film capacitor; and controlling the first Boost module to stop running when the voltage value across the first film capacitor reaches a second set voltage value. Controlling the first Boost module to stop running includes: controlling the first switch tube to turn off.

[0083] It can be understood that when the first film capacitor C1 is discharged, the voltage across the first film capacitor C1 continues to decrease. If the voltage of the DC signal rises to a level greater than the voltage across the first film capacitor C1, the DC signal charges the first film capacitor C1. Since the first film capacitor C1 is boosted and discharged to the load 400 through the first Boost module 200, the voltage across the second film capacitor C2 is higher than the voltage across the first film capacitor C1. When the voltage of the DC signal rises to a level greater than the voltage across the first film capacitor C1, the first Boost module 200 continues to operate, and the DC signal is boosted by the first Boost module 200 to supply power to the load.

[0084] Here, in the process of charging the first film capacitor C1 by the direct current signal, when the first film capacitor C1 reaches the second set voltage value, the voltage value across the first film capacitor C1 is equal to the sum of the voltage value across the second film capacitor C2 and the conduction voltage drop of the first diode D1. At this time, since the voltage across the first film capacitor C1 is greater than the voltage across the second film capacitor C2, and the first inductor L1 suppresses the current change, the direct current signal no longer charges the first film capacitor C1, and the direct current signal directly supplies power to the load 400. The first Boost module 200 does not need to continue to start, and the first switch tube Q1 is controlled to be cut off.

[0085] Exemplarily, the rectifier module 100 is a Boost PFC module, and the rectifier module 100 includes a second switch tube Q2. The method further includes: controlling the operation of the second switch tube based on a second duty cycle.

[0086] It is understandable that based on the second duty cycle, controlling the second switch tube Q2 to be continuously turned on and off can extend the on-time of the bridge rectifier module 101, improve the current and voltage waveforms of the external AC power supply 300, and enhance the power factor of the external AC power supply 300.

[0087] In an application example of the present application, if the rectifier module 100 is a Boost PFC module, the first set voltage value can be determined based on the voltage value of the external AC power supply 300, the capacitance of the second film capacitor C2, the second duty cycle and the output voltage range of the power supply device.

[0088] It can be understood that in the embodiment of the present application, the second film capacitor C2 is only used to filter the DC signal when the voltage value of the DC signal is greater than or equal to the first set voltage value, and there is no need to discharge the load 400 for a long time, so the capacitance of the second film capacitor C2 is relatively small. In an application example of the present application, the capacitance value of the second film capacitor C2 is set to 0.1uF~1uF.

[0089] In an application example of the present application, the capacitance of the first film capacitor C1 is determined based on the output voltage range of the power supply device. Specifically, the minimum capacitance of the first film capacitor C1 is as follows:

[0090]

[0091] Wherein, C1 is the minimum capacitance of the first film capacitor, f is the frequency of the external AC power supply 300, P e is the power of the load 400, t4 is the time when the voltage value of the DC signal is equal to the first set voltage value, U max It is the maximum output voltage limit of the power supply device.

[0092] It is understandable that in this application example, although the first film capacitor C1 needs to compensate for the discharge of the load 400, based on the boost processing of the first Boost module 200, the capacitance of the first film capacitor C1 is significantly smaller than the capacitance of the electrolytic capacitor used for filtering.

[0093] In an application example of the present application, a power supply device is provided, such as Figure 5 As shown. The external AC power supply 300 is input to the bridge rectifier module 101 after being filtered by the fifth film capacitor C5, the common mode inductor L3 and the fourth film capacitor C4. The input end of the bridge rectifier module is also connected to the thermistor PTC and the relay K1. The thermistor PTC is used to limit the current of the external input power supply 300. After the relay K1 is closed, the filtered external AC power supply is directly input to the bridge rectifier module 101. The second Boost module 102 also includes a third film capacitor C3, and the third film capacitor C3 is used to filter the electrical signal output by the bridge rectifier module 101. The power supply device also includes a controller 500 and a drive module 600. The controller 500 is used to obtain the output voltage value of the bridge rectifier module 101, the voltage value of the DC signal and the voltage value at both ends of the first filter capacitor C1. The controller 500 is also used to control the on and off state of the relay K1, and control the on and off state of the first switch tube Q1 and the second switch tube Q2 through the drive module 600. Here, based on the output voltage value of the bridge rectifier module 101 obtained, the driving module 600 sends the second duty cycle to the second switch tube Q2 via the second resistor R2, which is used to improve the power factor of the external AC power supply 300; based on the voltage value of the DC signal obtained being less than the first set voltage value, the driving module 600 sends the first duty cycle to the first switch tube Q1 via the first resistor R1, and the first film capacitor C1 discharges the load 400; based on the voltage value across the first filter capacitor C1 obtained reaching the second set voltage value, the driving module 600 controls the first switch tube Q1 to be turned off. A third resistor R3 is also provided at the ground end of the power supply device for current limiting.

[0094] Here, if Figure 6As shown, during the voltage rising period of the external AC power supply 300, the first film capacitor C1 discharges to the load 400. At time t1, the input voltage of the DC signal is higher than the voltage across the first film capacitor C1. At this time, the DC signal charges the first film capacitor C1. Since the voltage of the DC signal is lower than the voltage across the second film capacitor C2, the first switch tube Q1 continues to open and close continuously. The DC signal is boosted by the first Boost module 200 to supply power to the load 400, and the voltage across the first film capacitor C1 rises. At time t2, the voltage value across the first film capacitor C1 reaches the second preset value. The voltage value is equal to the sum of the voltage value across the second film capacitor C2 and the conduction voltage drop of the first diode D1. At this time, the DC signal no longer charges the first film capacitor C1. At this time, as the voltage of the external AC power supply 300 rises, the DC signal no longer charges the first film capacitor C1, and the first switch tube Q1 is controlled to be cut off. Since the voltage across the first film capacitor C1 is higher than the voltage across the second film capacitor C2, and the first inductor L1 blocks the current change, the DC signal directly supplies power to the load 400 through the second diode D2, and charges the second film capacitor C2; at time t3, the bridge rectifier module 1 01 reaches a peak value. In the stage of t2-t3, the voltage value across the first film capacitor C1 is stabilized at the second set voltage value, and the voltage across the second film capacitor C2 increases with the voltage increase of the external AC power supply 300. After t3, the external AC power supply 300 enters a voltage reduction cycle. Due to the reverse cutoff function of the third diode D3, the voltage value across the first film capacitor C1 is maintained at the second set voltage value, the voltage of the DC signal decreases, and the second film capacitor C2 starts to discharge to the load 400. At t4, the voltage value of the DC signal is less than the first set voltage value. Since the discharge capacity of the second film capacitor C2 is insufficient, the input voltage of the load 400 is close to the minimum limit of the output voltage of the power supply device, the first Boost module 200 is started, and the first switch tube Q1 is controlled to be turned on with a first duty cycle, and the first film capacitor C1 is discharged to the load 400 after being boosted by the first Boost module; during the discharge process of the first film capacitor C1, the voltage across the first film capacitor C1 decreases, and when the voltage of the DC signal cut in the external AC power supply 300 enters the voltage rising period again and is greater than the voltage across the first film capacitor C1, the first film capacitor C1 enters the charging process again.

[0095] Here, at time t3, before controlling the first switch tube Q1 to be turned on with the first duty cycle, the first switch tube Q1 may be controlled to be turned on continuously in advance to pre-charge the first inductor L1.

[0096] The embodiment of the present application further provides an electronic device, comprising the aforementioned power supply device. The electronic device also comprises a controller, and the controller is configured to execute the aforementioned control method of the power supply device.

[0097] Here, the controller can be a digital signal processor (DSP), a programmable logic device (PLD), a complex programmable logic device (CPLD), a field programmable gate array (FPGA), a general-purpose processor, a controller, a microcontroller (MCU), a microprocessor or an electronic component.

[0098] In an application example of the present application, the electronic device is an air conditioner, the external AC power supply 300 is a mains power supply, and the power supply device is arranged on the AC bus of the air conditioner to supply power to the DC load of the air conditioner.

[0099] It can be understood that the air conditioner in this application example is provided with a power supply device without an electrolytic capacitor, thus effectively improving the actual service life of the air conditioner.

[0100] In an exemplary embodiment, the embodiment of the present application further provides a storage medium, namely a computer storage medium, which can be a computer-readable storage medium, for example, a memory including a computer program, and the aforementioned computer program can be executed by a controller to complete the steps described in the method of the embodiment of the present application. The computer-readable storage medium can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a magnetic random access memory (FRAM), a flash memory, a magnetic surface memory, an optical disc, or a compact disc read-only memory (CD-ROM); the magnetic surface memory can be a disk memory or a tape memory.

[0101] In an exemplary embodiment, the embodiment of the present application further provides a computer program product, including a computer program, and the computer program can be executed by a controller to complete the steps described in the method of the embodiment of the present application.

[0102] It should be noted that: "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0103] In addition, the technical solutions described in the embodiments of the present application can be combined arbitrarily without conflict.

[0104] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A power supply device, characterized in that: The power supply device comprises: A rectifier module, used to rectify an external AC power supply into a DC signal, and the DC signal is used to supply power to a load; A first boost module, wherein a power supply end of the first boost module is connected to an output end of the rectifier module, and an output end of the first boost module is connected to the load; A first film capacitor is arranged between the output end of the rectifier module and the power supply end of the first Boost module; A second thin film capacitor is provided between the output end of the rectifier module and the load, and is used for filtering the DC signal; The DC signal is also used to charge the first film capacitor; the first film capacitor is used to discharge the load via the first Boost module when the voltage value of the DC signal is less than a first set voltage value.

2. The power supply device according to claim 1, characterized in that: The first Boost module comprises: A first inductor, wherein an input end of the first inductor is respectively connected to an output end of the rectifier module and the first film capacitor; A first switch tube, wherein an input end of the first switch tube is connected to an output end of the first inductor, and an output end of the first switch tube is connected to a ground end; A first diode, wherein an anode of the first diode is connected to the output end of the first inductor, and a cathode of the first diode is connected to the load.

3. The power supply device according to claim 1, characterized in that: The rectifier module is a boost power factor correction Boost PFC module, including a bridge rectifier module and a second Boost module. The rectifier module is also used to improve the power factor of the external AC power supply.

4. The power supply device according to claim 3, characterized in that: The second Boost module comprises: A second inductor, an input end of which is connected to the bridge rectifier module; A second switch tube, wherein an input end of the second switch tube is connected to an output end of the second inductor, and an output end of the second switch tube is connected to a ground end; A second diode, wherein an anode of the second diode is connected to the output end of the second inductor, and a cathode of the second diode is connected to the load.

5. The power supply device according to claim 1, characterized in that: The power supply device also includes: A third diode, wherein an anode of the third diode is connected to the output end of the rectifier module, and a cathode of the third diode is respectively connected to the power supply end of the first Boost module and the first film capacitor.

6. A control method for a power supply device according to any one of claims 1 to 5, characterized in that: The method comprises: Acquiring a voltage value of the direct current signal; When it is determined that the voltage value of the direct current signal is less than the first set voltage value, the first Boost module is controlled to start.

7. The method according to claim 6, characterized in that The first Boost module includes a first switch tube, and the controlling the first Boost module to start includes: Based on a first duty cycle, the first switch tube is controlled to operate.

8. The method according to claim 7, characterized in that The method further comprises: Obtaining a voltage value across the first film capacitor; When it is determined that the voltage value across the first film capacitor reaches a second set voltage value, controlling the first Boost module to stop running; The step of controlling the first Boost module to stop running includes: The first switch tube is controlled to be cut off.

9. The method according to claim 6, characterized in that The rectifier module is a Boost PFC module, the rectifier module includes a second switch tube, and the method further includes: Based on the second duty cycle, the second switch tube is controlled to operate.

10. An electronic device, characterized in that: The electronic device comprises the power supply device according to any one of claims 1 to 5, and the electronic device further comprises a controller, wherein: The controller is used to execute the steps of the method according to any one of claims 6 to 9 when running a computer program.

11. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a controller, the steps of the method according to any one of claims 6 to 9 are implemented.

12. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a controller, the steps of the method according to any one of claims 6 to 9 are implemented.

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