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 power factor correction (PFC) module, a first thin film capacitor, a second thin film capacitor and a switch module, the PFC module comprises a rectification module, a first boost module and a second boost module, the rectifier module is used for rectifying an external alternating current power supply into a direct current signal, and the direct current signal supplies power to a load through the first Boost module and / or the second Boost module; the first thin film capacitor is arranged at the power supply end of the second Boost module; the second thin-film capacitor is arranged at the power supply end of the load and is used for filtering electric signals output by the first Boost module and / or the second Boost module; the switch module is used for controlling the connection state between the output end of the first Boost module and the power supply end of the second Boost module. According to the embodiment of the invention, the thin-film capacitor with a relatively long service life is adopted to replace a high-capacity electrolytic capacitor with a relatively short service life, so that the actual 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 power factor correction (PFC) module, comprising a rectifier module, a first boost module and a second boost module, wherein the rectifier module is used to rectify an external AC power supply into a DC signal, and the DC signal supplies power to a load via the first boost module and / or the second boost module;

[0008] A first film capacitor, arranged at a power supply terminal of the second Boost module;

[0009] a second film capacitor, disposed at a power supply end of the load, for filtering the electrical signal output by the first Boost module and / or the second Boost module;

[0010] A switch module, used to control the connection state between the output end of the first Boost module and the power supply end of the second Boost module;

[0011] Wherein, when the switch module is disconnected, the DC signal is also used to charge the first thin film capacitor; when the switch module is closed, the DC signal is also used to charge the first thin film capacitor via the first Boost module; when the voltage value of the DC signal drops to a first set voltage value, the first thin film capacitor is used to supply power to the load via the second Boost module.

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

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

[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 second Boost module includes:

[0017] a second diode, wherein an anode of the second diode is connected to an output end of the rectifier module;

[0018] a second inductor, wherein input ends of the second inductor are respectively connected to the cathode of the second diode and the first film capacitor;

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

[0021] In some embodiments, the switch module includes:

[0022] a fourth diode, wherein an anode of the fourth switch tube is connected to an output end of the first inductor;

[0023] A third switch tube, wherein an input end of the third switch tube is connected to the cathode of the fourth diode, and an output end of the third switch tube is connected to the first film capacitor.

[0024] 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:

[0025] Acquiring a voltage value of the direct current signal;

[0026] When the switch module is in a closed state, obtaining a voltage value across the first film capacitor;

[0027] Determining that the voltage value across the first film capacitor reaches a second set voltage value, then controlling the second Boost module to stop running;

[0028] When it is determined that the voltage value of the direct current signal drops to the first set voltage value, the second Boost module is controlled to start.

[0029] In some embodiments, the method further comprises:

[0030] Determining that the voltage value of the DC signal reaches a DC voltage peak value, then controlling the switch module to close;

[0031] When it is determined that the voltage value of the direct current signal rises to the voltage value across the first film capacitor, the switch module is controlled to be disconnected.

[0032] In some embodiments, the first Boost module includes a first switch tube, and the method further includes:

[0033] Based on a first duty cycle, the first switch tube is controlled to operate.

[0034] In some embodiments, the second Boost module includes a second switch tube, and controlling the second Boost module to stop running includes:

[0035] Controlling the second switch tube to be cut off;

[0036] The controlling the second Boost module to start includes:

[0037] Based on the second duty cycle, the second switch tube is controlled to operate.

[0038] 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:

[0039] The controller is used to execute the steps of the method described in the second aspect when running a computer program.

[0040] 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.

[0041] 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 in the second aspect.

[0042] The power supply device provided in the embodiment of the present application includes: a PFC module, a first film capacitor, a second film capacitor and a switch module, the PFC module includes a rectifier module, a first Boost module and a second Boost module, the rectifier module is used to rectify an external AC power supply into a DC signal, and the DC signal supplies power to a load via the first Boost module and / or the second Boost module; the first film capacitor is arranged at the power supply end of the second Boost module; the second film capacitor is arranged at the power supply end of the load, and is used to filter the electrical signal output by the first Boost module and / or the second Boost module; the switch module is used to control the connection state between the output end of the first Boost module and the power supply end of the second Boost module; wherein, when the switch module is disconnected, the DC signal is also used to charge the first film capacitor; when the switch module is closed, the DC signal is also used to charge the first film capacitor via the first Boost module; when the voltage value of the DC signal drops to a first set voltage value, the first film capacitor is used to supply power to the load via the second Boost module. In this way, a film capacitor with a smaller capacitance is used as a filter capacitor. When the voltage of the DC signal is low, since the electrical signal output by the PFC module cannot directly meet the load power demand, the first film capacitor continues to discharge to the load, so the input voltage of the load will not be significantly reduced due to the small capacitance of the filter capacitor; by closing the switch module to increase the electrical energy stored in the first film capacitor during the charging process, and the first film capacitor is discharged after being boosted by the second Boost module, the power supply device has a lower capacitance requirement for the first film capacitor C1. There is no electrolytic capacitor in the power supply device of the embodiment of the present application, which increases the actual service life of the power supply device. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic diagram of the structure of a power supply device according to an embodiment of the present application;

[0044] Figure 2 This is a schematic diagram of the structure of a power supply device according to another embodiment of the present application;

[0045] Figure 3 A schematic diagram of a flow chart of a control method of a power supply device according to an embodiment of the present application;

[0046] Figure 4 This is a structural schematic diagram of a power supply device in an application example of the present application;

[0047] Figure 5 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

[0048] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0049] 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.

[0050] The present application embodiment provides a power supply device, such as Figure 1 As shown, the power supply device includes: a PFC module 100, a first film capacitor C1, a second film capacitor C2 and a switch module 200. The PFC module 100 includes a rectifier module 101, a first Boost module 102 and a second Boost module 103. The rectifier module 101 is used to rectify the external AC power supply 300 into a DC signal, and the DC signal supplies power to the load 400 through the first Boost module 102 and / or the second Boost module 103. The first film capacitor C1 is arranged at the power supply end of the second Boost module 103. The second film capacitor C2 is arranged at the power supply end of the load 400, and is used to filter the electrical signal output by the first Boost module 102 and / or the second Boost module 103. The switch module 200 is used to control the connection state between the output end of the first Boost module 102 and the power supply end of the second Boost module 103. Among them, when the switch module 200 is disconnected, the DC signal is also used to charge the first film capacitor C1; when the switch module 200 is closed, the DC signal is also used to charge the first film capacitor C1 via the first Boost module 102; when the voltage value of the DC signal drops to the first set voltage value, the first film capacitor C1 is used to power the load 400 via the second Boost module 103.

[0051] Here, the power supply device of the embodiment of the present application is a rectifier power supply device.

[0052] It should be noted that the rectifier power supply device usually 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. 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, emitting beat frequency electromagnetic noise. Therefore, the rectifier power supply device is usually also provided with a filter module, which is used to filter the DC signal output by the rectifier module, so that the voltage output by the rectifier power supply device tends to be stable.

[0053] Here, the rectifier module 101 in the embodiment of the present application may be a bridge rectifier module.

[0054] It should be noted that 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 stable power supply 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 electrical signal output by the PFC module 100.

[0055] It should be noted that the rectifier module usually uses the reverse cutoff function of the diode to rectify the external AC power supply. When the DC signal output by the rectifier module is directly supplied to the load after being filtered by the filter capacitor, if the voltage of the DC signal is higher than the voltage across the filter capacitor, the DC signal supplies power to the load and charges the filter capacitor; if the voltage of the DC signal is lower than the voltage across the filter capacitor, the DC signal does not supply power to the load, and the filter capacitor discharges the load, and the rectifier module has no output at this time. It is easy to understand that if the DC signal output by the rectifier module is directly supplied to the load after being filtered by the filter capacitor, the rectifier module will only output when the voltage value of the DC signal is higher than the voltage across the filter capacitor. The current input from the external AC power supply to the rectifier power supply module is a high-amplitude spike pulse, and the current waveform contains a large number of harmonic components and is severely distorted, which reduces the power factor of the external AC power supply.

[0056] It is understandable that in order to suppress the current waveform distortion of the external AC power supply, the rectifier power supply device is usually provided with a PFC module for power factor correction. The PFC module includes various forms such as a Boost PFC module and a totem pole PFC module, wherein the Boost PFC module is provided with a Boost module at the output end of the rectifier module to boost the DC signal and supply power to the load. It is easy to understand that after the DC signal is boosted, the time during which the voltage output by the Boost PFC module is higher than the voltage across the filter capacitor can be extended, thereby effectively extending the output time of the rectifier module and improving the power factor of the external AC power supply.

[0057] Here, in an embodiment of the present application, the output end of the rectifier module 101 is respectively connected to the power supply end of the first Boost module 102 and the power supply end of the second Boost module 103, and the output end of the first Boost module 102 and the output end of the second Boost module 103 are both connected to the load 400. The DC signal output by the rectifier module 101 is boosted by the first Boost module 102 and / or the second Boost module 103 to power the load 400, thereby improving the power factor of the external AC power supply 300.

[0058] For example, Figure 2As shown, the first Boost module 102 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 101. 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.

[0059] Exemplarily, the second Boost module 103 includes: a second diode D2, a second inductor L2, a second switch tube Q2 and a third diode D3. The anode of the second diode D2 is connected to the output end of the rectifier module 101. The input end of the second inductor L2 is connected to the cathode of the second diode D2. 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 third diode D3 is connected to the output end of the second inductor L2, and the cathode of the third diode D3 is connected to the load 400.

[0060] It can be understood that if the first switch tube Q1 is turned on, the first inductor L1 stores energy; if the first switch tube Q1 is turned off, the rectifier module 101 and the first inductor L1 jointly supply power to the load 400 .

[0061] It can be understood that if the second switch tube Q2 is turned on, the second inductor L2 stores energy; if the second switch tube Q2 is turned off, the rectifier module 101 and the second inductor L2 jointly supply power to the load 400 .

[0062] It is understandable that, based on controlling the first switch tube Q1 and / or the second switch tube Q2 to be turned on at a set duty cycle, the DC signal is boosted by the first Boost module 102 and / or the second Boost module 103 to supply power to the load 400, so as to improve the power factor of the external AC power supply 300. It is understandable that the PFC module 100 supplies power to the load 400 in two ways, which can reduce the voltage ripple of the output of each Boost module and improve the output efficiency of the power supply device.

[0063] 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.

[0064] 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.

[0065] It should be noted that, although increasing the duty cycle of the switch tube of the Boost module can improve the output power of the Boost module, the first Boost module 102 and the second Boost module 103 of the PFC module 100 of the embodiment of the present application are used for power factor correction. If the duty cycle of the first switch tube Q1 and the second switch tube Q2 is continuously increased, the current input from the external AC power supply 300 to the power supply device contains excessive third harmonics. Therefore, when the voltage of the external AC voltage 300 is low, it is impossible to directly increase the duty cycle of the first switch tube Q1 and the second switch tube Q2 to enable the PFC module 100 to maintain the output power.

[0066] Based on this, the power supply device of the embodiment of the present application not only uses the second film capacitor C2 as the filter capacitor, but also includes a first film capacitor C1, wherein the first film capacitor C1 is used to discharge the load 400 when the voltage of the external AC power supply 300 is low to compensate for the filtering capability of the second film capacitor C2.

[0067] Specifically, the first film capacitor C1 is arranged at the power supply end of the second Boost module 103. When the DC signal supplies power to the load 400 via the second Boost module 103, the DC signal will also charge the first film capacitor C1. The voltage across the first film capacitor C1 is higher than the voltage of the DC signal. When the second Boost module 103 is running, the first film capacitor C1 uses the pre-stored electric energy to discharge to the load 400 via the second Boost module 103, so as to solve the problem of insufficient output capacity caused by the power supply device using the second film capacitor C2 as a filter capacitor.

[0068] Here, the anode of the second diode D2 is also connected to the first film capacitor C1, and the input end of the second inductor L2 is also connected to the first film capacitor C1. Based on the reverse cutoff function of the second diode D2, when the voltage of the DC signal is lower than the voltage across the first film capacitor C1, the first film capacitor C1 discharges the rectifier module 101.

[0069] It should be noted that, since the first film capacitor C1 is arranged at the power supply end of the second Boost module 103, during the charging process of the first film capacitor C1, the maximum voltage value across the first film capacitor C1 is the maximum voltage value of the DC signal, and at this time, the voltage of the external AC power supply 300 reaches a peak value; after the voltage of the external AC power supply 300 begins to drop, the voltage of the DC signal is lower than the voltage of the first film capacitor C1, and the first film capacitor C1 is no longer charged. At this time, due to the poor filtering effect of the second film capacitor C2, the voltage of the first film capacitor C1 after being boosted by the second Boost module 103 is higher than the voltage across the second film capacitor C2, and the first film capacitor C1 discharges to the load 400 to compensate for the output capacity of the voltage device. However, since the capacitance of the first film capacitor C1 is relatively small, and the second switch tube Q2 is turned on at a set duty cycle based on the power factor correction function, the first film capacitor C1 has limited compensation capacity for the output capacity of the power supply device.

[0070] Here, the power supply device of the embodiment of the present application is provided with a switch module 200 for increasing the maximum voltage value across the first film capacitor C1 during the charging process, so as to further enhance the discharge capability of the first film capacitor C1 to the load 400 .

[0071] Exemplarily, the switch module 200 is used to control the connection state between the output end of the first Boost module 102 and the power supply end of the second Boost module 103. When the switch module 200 is closed, the output end of the first Boost module 102 and the power supply end of the second Boost module 103 are connected; when the switch module 200 is disconnected, the output end of the first Boost module 102 and the power supply end of the second Boost module 103 are disconnected.

[0072] Exemplarily, the switch module 200 includes: a fourth diode D4 and a third switch tube Q3. The anode of the fourth switch tube D4 is connected to the output end of the first inductor L1. The input end of the third switch tube Q3 is connected to the cathode of the fourth diode D4, and the output end of the third switch tube Q3 is connected to the first film capacitor C1.

[0073] It can be understood that the third switch tube Q3 is also connected to the output end of the second inductor L2.

[0074] It can be understood that when the third switch tube Q3 is turned on, the switch module 200 is in a closed state; when the third switch tube Q3 is turned off, the switch module 200 is in an open state.

[0075] It should be noted that when the switch module 200 is disconnected, the first Boost module 102 is only used to supply power to the load 400; when the first Boost module 102 supplies power to the load 400, the voltage value of the electrical signal output by the first Boost module 102 is close to the voltage value across the second film capacitor C2. If the control switch module 200 is in a closed state, the output end of the first inductor L1 is connected to the input end of the first film capacitor C1 and the second inductor L2 respectively through the switch module 200. Since the voltage value across the first film capacitor C1 is equal to the voltage value of the DC signal at this time, which is less than the voltage value of the electrical signal output by the first Boost module 102, the electrical signal output by the first Boost module 102 will not directly supply power to the load 400, but will charge the first film capacitor C1. At the same time, the electrical signal output by the first Boost module 102 is boosted by the second Boost module to supply power to the load 400.

[0076] It is understandable that after the voltage of the external AC power supply 300 reaches its peak value, the rectifier module 101 cannot further charge the first film capacitor C1. At this time, the switch module 200 is closed, and the electrical signal output by the first Boost module 102 continues to charge the first film capacitor C1. When the voltage value of the electrical signal output by the first Boost module 102 is equal to the voltage value across the first film capacitor C1, the electrical signal output by the first Boost module no longer charges the first film capacitor C1, and supplies power to the load 400 via the third diode D3.

[0077] It is understandable that after the switch module 200 is closed, the output power of the first Boost module 102 is boosted by the second Boost module 103 to supply power to the load 400, which can extend the power supply time of the PFC module 100 to the load 400 and improve the output capacity of the power supply device.

[0078] It can be understood that after the switch module 200 is closed, the first film capacitor C1 is continuously charged, which increases the electric energy stored in the first film capacitor C1 during the charging process, so that when the voltage of the external AC power supply 300 is low, the first film capacitor C1 releases more electric energy to the load 400 through the second Boost module 103, thereby reducing the capacitance requirement of the first film capacitor C1 and improving the output capacity of the power supply device.

[0079] It is understandable that the embodiment of the present application uses the second film capacitor C2 with a smaller capacitance as the filter capacitor. When the voltage of the DC signal is low, since the electrical signal output by the PFC module 100 cannot directly meet the power demand of the load 400, the first film capacitor C1 continues to discharge the load 400, so the input voltage of the load 400 will not be significantly reduced due to the small capacitance of the filter capacitor; by closing the switch module 200 to increase the electrical energy stored in the first film capacitor C1 during the charging process, and the first film capacitor C1 is discharged after being boosted by the second Boost module 103, the power supply device has a lower capacitance requirement for the first film capacitor C1. There is no electrolytic capacitor in the power supply device of the embodiment of the present application, which increases the actual service life of the power supply device.

[0080] The present application also provides a control method for the aforementioned power supply device, such as Figure 3 As shown, the method includes:

[0081] Step 301, obtaining the voltage value of the direct current signal.

[0082] Step 302: When the switch module is in a closed state, the voltage value across the first film capacitor is obtained.

[0083] Step 303: When it is determined that the voltage across the first film capacitor reaches a second set voltage value, the second Boost module is controlled to stop running.

[0084] Step 304 , when it is determined that the voltage value of the DC signal drops to a first set voltage value, the second Boost module is controlled to start.

[0085] Exemplarily, the first Boost module 102 includes a first switch tube Q1 , and the method further includes: controlling the operation of the first switch tube based on a first duty cycle.

[0086] Exemplarily, the second Boost module 103 includes a second switch tube Q2, and controlling the second Boost module to stop running includes: controlling the second switch tube to be turned off.

[0087] Exemplarily, controlling the second Boost module to start includes: controlling the second switch tube to operate based on the second duty cycle.

[0088] Here, the PFC module 100 is used to rectify the external AC power source 300 and supply power to the load 400 , wherein a first Boost module 102 and a second Boost module 103 are provided at the output end of the rectifier module 101 to improve the power factor of the external AC power source 300 .

[0089] Here, the first duty cycle and the second duty cycle are duty cycles preset based on the power factor correction function. When the first Boost module 102 starts running, the first switch tube Q1 is controlled to operate based on the first duty cycle; when the second Boost module 103 starts running, the second switch tube Q2 is controlled to operate based on the first duty cycle; based on the continuous opening and closing of the first switch tube Q1 and / or the second switch tube Q2, the output voltage of the PFC module 100 is increased, and the input current waveform distortion of the external AC power supply 300 is improved.

[0090] It should be noted that the PFC module 100 is used to perform power factor correction on the external AC power supply 300. When the voltage of the external AC power supply 300 drops, in order to maintain the input voltage of the load 400 stable, the current input from the external AC power supply 300 to the power supply device increases. Since the current input from the external AC power supply 300 to the power supply device will contain excessive third harmonics when it is too large, it is impossible to maintain the stable power supply of the PFC module 100 to the load 400 by setting an excessively large first duty cycle and / or second duty cycle. Therefore, when the voltage of the external AC power supply 300 is low, the electrical signal output by the PFC module 100 still cannot meet the power supply demand of the load 400. At this time, the filter capacitor of the power supply device supplies power to the load 400.

[0091] It should be noted that, in order to improve the actual service life of the power supply device, the embodiment of the present application adopts a second film capacitor C2 with a long service life and a small capacitance as a filter capacitor. Since the filtering effect of the second film capacitor C2 is poor, it is impossible to maintain a stable power supply to the load 400 when the voltage output by the PFC module 100 is lower than the voltage across the second film capacitor C2. Therefore, the power supply device is also provided with a first film capacitor C1, which is used to compensate for the power supply to the load 400 when the voltage output by the PFC module 100 is lower than the voltage across the second film capacitor C2, so as to maintain the output stability of the power supply device.

[0092] Specifically, when the voltage output by the PFC module 100 is higher than the voltage across the second film capacitor C2, the electrical signal output by the PFC module 100 supplies power to the load 400 and charges the first film capacitor C1 and the second film capacitor C2; when the voltage output by the PFC module 100 is lower than the voltage across the second film capacitor C2, the first film capacitor C1 and the second film capacitor C2 discharge the load 400.

[0093] It should be noted that the first film capacitor C1 is arranged at the power supply end of the second Boost module 103. When the DC signal supplies power to the load 400 via the second Boost module 103, the first film capacitor C1 is charged at the same time. When the voltage of the external AC power supply 300 reaches a peak value, the voltage across the first film capacitor C1 reaches a maximum value, which is equal to the maximum voltage value of the DC signal. When the voltage of the external AC power supply 300 starts to decline after reaching a peak value, the voltage of the DC signal is lower than the voltage across the first film capacitor C1. The first film capacitor C1 is discharged to the load 400 via the second Boost module. However, in the initial decline stage of the voltage of the external AC power supply 300, the electrical signal output by the PFC module 100 can maintain the load 400. The input voltage is stable. At this time, the first film capacitor C1 does not need to discharge the load 400. Therefore, after the charging process of the first film capacitor C1 is completed, the embodiment of the present application controls the second switch tube Q2 to be turned off, the second Boost module 103 stops running, and the second inductor L2 blocks the current change. The first film capacitor C1 does not supply power to the load 400, and the DC signal supplies power to the load 400 through the first Boost module 102; when the electrical signal output by the PFC module 100 cannot maintain the voltage stability of the input power supply of the load 400, the second switch tube Q2 is controlled to be turned on, the second Boost module 103 is started, and the first film capacitor C1 discharges to the load 400 through the second Boost module 103 to maintain the stability of the input power supply of the load 400.

[0094] It is understandable that when the DC signal drops to the first set voltage value, it can be determined that the current input to the power supply device by the external AC power supply 300 cannot be further increased to maintain the input voltage of the load 400 stable. At this time, the second Boost module 103 is controlled to start and the first film capacitor C1 enters a discharge state.

[0095] Here, the first set voltage value can be determined based on the voltage value of the external AC power supply 300 and the output voltage range of the power supply device. In an application example of the present application, the first set voltage value is specifically:

[0096]

[0097] 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.

[0098] It should be noted that in order to increase the amount of electricity released by the first film capacitor C1 to the load 400 and improve the output capacity of the power supply device, the power supply device is also provided with a switch module 200 for switching the charging power supply of the first film capacitor C1 so that the first film capacitor C1 can store more electrical energy during the charging process.

[0099] Here, the switch module 200 is used to control the connection state between the output end of the first Boost module 102 and the power supply end of the second Boost module 103. When the switch module 200 is in the disconnected state, the DC signal output by the rectifier module 101 charges the first film capacitor C1; when the switch module 200 is switched from the disconnected state to the closed state, the output end of the first Boost module 102 is connected to the power supply end of the second Boost module 103. Since the voltage value across the first film capacitor C1 is close to the voltage value of the DC signal, and the voltage value across the second film capacitor C2 is close to the voltage value of the DC signal after being boosted by the Boost module, the voltage value across the first film capacitor C1 is less than the voltage value across the second film capacitor C2, and the voltage value output by the first Boost module 102 is greater than the voltage value of the DC signal, the electrical signal output by the first Boost module 102 charges the first film capacitor C1.

[0100] It can be understood that, based on the switch module 200 being in a closed state, the electrical signal output by the first Boost module 102 can be controlled to charge the first film capacitor C1, and since the voltage across the first film capacitor C1 has not reached the maximum value, the second Boost module 103 starts to run, and the electrical signal output by the first Boost module 102 is boosted by the second Boost module 103 to power the load 400.

[0101] Exemplarily, the method further includes: determining that the voltage value of the DC signal reaches a DC voltage peak value, and then controlling the switch module to close.

[0102] Exemplarily, controlling the switch module to close includes: controlling the third switch tube to turn on.

[0103] It can be understood that the electrical signal output by the first Boost module 102 charges the first film capacitor C1, which will lower the voltage output by the first Boost module 102. Therefore, during the charging process of the first film capacitor C1, if the voltage across the first film capacitor C1 is lower than the DC voltage peak value, the switch module 200 is in a disconnected state, the DC signal charges the first film capacitor C1, and the first Boost module 102 and the second Boost module 103 are only used to supply power to the load 400 to ensure the output capacity of the power supply device; when the voltage value of the DC signal reaches the DC voltage peak value, the DC signal can no longer charge the first film capacitor C1, then the switch module 200 is controlled to close, the first Boost module 102 continues to charge the first film capacitor C1, the voltage across the first film capacitor C1 gradually rises, and continues to store electrical energy.

[0104] It should be noted that, during the process of charging the first film capacitor C1 by the output of the first Boost module 102, as the voltage across the first film capacitor C1 gradually rises, if the voltage value across the first film capacitor C1 is close to the voltage value across the second film capacitor C2, the electrical signal output by the first Boost module 102 no longer flows through the fourth diode D4 and the third switch tube Q3 of the switch module 200, but directly supplies power to the load 400 through the first diode D1. At this time, the second switch tube Q2 is controlled to be cut off, the second Boost module 103 stops running, and the PFC module 100 supplies power to the load 400 only through the first Boost module 102, and the amount of electricity stored in the first film capacitor C1 remains unchanged.

[0105] Here, based on the voltage value across the first film capacitor C1 reaching the second set voltage value, it is determined that the voltage value across the first film capacitor C1 is close to the voltage value across the second film capacitor C2, and the second Boost module 103 stops running to prevent the first Boost module 102 and / or the first film capacitor C1 from discharging the second inductor L2. The second set voltage value can be determined based on the output voltage range of the power supply device.

[0106] In an application example of the present application, the power supply device also obtains the voltage value across the second film capacitor C2, and after step 302, determines that the voltage value across the first film capacitor C1 reaches the voltage value across the second film capacitor C2, and then controls the second Boost module 103 to stop running.

[0107] Here, when the first film capacitor C1 is discharged, if the voltage across the first film capacitor C1 drops faster, since the switch module 200 is in a closed state and the first switch tube Q1 is continuously turned on with a first duty cycle, the electrical signal output by the first Boost module 102 increases the voltage value across the first film capacitor C1, and the first Boost module 102 and the first film capacitor C1 simultaneously supply power to the load 400, slowing down the voltage drop across the first film capacitor C1.

[0108] Exemplarily, the method further includes: determining that the voltage value of the direct current signal rises to the voltage value across the first film capacitor, and then controlling the switch module to disconnect.

[0109] Exemplarily, controlling the switch module to disconnect includes: controlling the third switch tube to turn off.

[0110] It should be noted that, during the voltage drop period of the external AC power supply 300, the voltage of the DC signal drops accordingly. If the voltage value of the DC signal drops to the first set voltage value, the second Boost module 103 is started, and the first film capacitor C1 discharges the load; the voltage across the first film capacitor C1 gradually drops as the discharge progresses. During the voltage rise period of the external AC power supply 300, the voltage of the DC signal rises accordingly. If the voltage value of the DC signal rises to the voltage value across the first film capacitor C1, the first film capacitor C1 no longer discharges. Since the DC signal can directly charge the first film capacitor C1, the control switch module 200 is disconnected, and the DC signal supplies power to the load 400 via the first Boost module 102 and the second Boost module 103, respectively.

[0111] It is understandable that in the embodiment of the present application, the power supply device uses the DC signal output by the rectifier module 101 and / or the first film capacitor C1 to power the load 400 via the Boost module, and the second film capacitor C2 as a filter capacitor does not need to discharge the load for a long time, so the capacitance of the second film capacitor C2 is relatively small. In an application example summary of the present application, the capacitance value of the second film capacitor C2 is set to 0.1uF~1uF.

[0112] It is understandable that in the embodiment of the present application, based on the state switching of the switch module 200, the first film capacitor C1 stores more electric energy during the charging process, thereby increasing the maximum voltage value across the first film capacitor C1 during the charging process, and reducing the capacitance requirement of the power supply device for the first film capacitor C1. Since the power supply device of the embodiment of the present application has no electrolytic capacitor, the actual service life of the power supply device is improved.

[0113] In an application example of the present application, a power supply device is provided, such as Figure 4As shown. The external AC power supply 300 is input to the 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 rectifier module 101 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 rectifier module 101. The PFC module 100 also includes a third film capacitor C3, and the third film capacitor C3 is used to filter the DC signal output by the 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 voltage value of the DC signal and the voltage value at both ends of the first film 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 voltage value of the acquired DC signal, the driving module 600 sends a first PWM signal of a first duty cycle to the first switch tube Q1 via the first resistor R1, so as to improve the power factor of the external AC power supply 300; based on the voltage value across the first film capacitor C1 reaching the second set voltage value, the driving module 600 stops sending the PWM signal to the second switch tube Q2; based on the voltage value of the acquired DC signal dropping to the first set voltage value, the driving module 600 sends a second PWM signal of a second duty cycle to the second switch tube Q2 via the second resistor R3, and the DC signal or the first film capacitor C1 supplies power to the load 400. A third resistor R3 is also provided at the ground end of the power supply device for current limiting.

[0114] In addition, the driving module 600 is also connected to the driving end of the third switch tube Q3 (not shown in the figure), and the controller 500 is also used to control the on / off state of the third switch tube Q3 through the driving module 600. Here, based on the voltage value of the acquired DC signal reaching the DC voltage peak value, the driving module 600 controls the third switch tube Q3 to turn on; based on the voltage value of the acquired DC signal rising to the voltage value across the first film capacitor C1, the driving module 600 controls the third switch tube Q3 to turn off.

[0115] Here, if Figure 5As shown, during the voltage rising period of the external AC power supply, the first film capacitor C1 discharges to the load 400, and the voltage across the third film capacitor C3 (shown by the solid line) is the voltage of the DC signal; at time t1, the 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, and the first switch tube Q1 and the second switch tube Q2 are turned on based on the set duty cycle. The DC signal supplies power to the load 400 via the first Boost module 102 and the second Boost module 103. At this time, the first Boost module 102 is not required. The electric signal output by the block 102 charges the first film capacitor C1, and the third switch tube Q3 is turned off. The voltage value across the first film capacitor C1 rises with the voltage value of the DC signal. At time t2, the voltage value of the external AC power supply 300 reaches a peak value. At this time, the voltage value of the DC signal also reaches the DC voltage peak value. In order to further increase the voltage across the first film capacitor C1, the third switch tube Q3 is turned on. At time t2-t3, when the voltage of the external AC power supply enters a decreasing period, the first Boost module 102 continues to charge the first film capacitor C1. The voltage across the film capacitor C1 rises linearly; at time t3, the voltage value across the first film capacitor C1 is close to the voltage value across the second film capacitor C2, reaching the second set voltage value, and the first Boost module 102 no longer charges the first film capacitor C1. At this time, the second switch tube Q2 is controlled to be cut off, and the DC signal supplies power to the load 400 through the first Boost module 102; at time t4, the voltage value of the DC signal drops to the first set voltage value, and the electrical signal output by the PFC module 100 cannot maintain the input voltage of the load 400 stable, so the second switch tube Q2 is controlled to be cut off. The switch tube Q2 is turned on again with the set duty cycle, and the first film capacitor C1 discharges to the load 400 to compensate for the insufficient output capacity of the power supply device; when the first film capacitor C1 is discharged, the voltage value across the first film capacitor C1 gradually decreases, and after the voltage of the external AC power supply enters the rising cycle again, when the external AC power supply 300 enters the voltage rising cycle again and the voltage value of the DC signal is greater than the voltage value across the first film capacitor C1, the first film capacitor C1 enters the charging process again, the DC signal charges the first film capacitor C1, and the third switch tube Q3 is turned off. The current waveform input from the external AC power supply 300 to the power supply device is shown as the dotted line. Based on the on-off control of the first switch tube Q1 and the second switch tube Q2, the waveform of the input current is improved, and the power factor of the external AC power supply is improved.

[0116] In the example of the present application, the power supply device controls the input current value of the external AC power source 300 input to the power supply device based on adjusting the duty cycle of the switch tube of the Boost module to perform power factor correction on the external AC power source 300.

[0117] Specifically, the input current value is as follows:

[0118]

[0119] Among them, I in is the input current value, I rms is the fundamental effective value of the input current; ω is the angular frequency of the external AC power supply.

[0120] Here, in the stages t1 to t2 and t3 to t4, the DC signal directly supplies power to the load 400 via the first Boost module 102. When the on / off state of the first switch tube Q1 is controlled, the corresponding high-order harmonics in the input current can be suppressed by injecting specific harmonics.

[0121] Specifically, in the t1-t2 stage and the t3-t4 stage, the input current value is as follows:

[0122]

[0123] Among them, k is the amplitude coefficient of the third harmonic. The larger the coefficient, the larger the third harmonic value.

[0124] Here, in the period from t1 to t2 and from t3 to t4, the third harmonic in the input current can be effectively suppressed by injecting the third harmonic and controlling the value of k.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] In addition, the technical solutions described in the embodiments of the present application can be combined arbitrarily without conflict.

[0133] 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 power factor correction PFC module, comprising a rectifier module, a first boost module and a second boost module, wherein the rectifier module is used to rectify an external AC power supply into a DC signal, and the DC signal supplies power to a load via the first boost module and / or the second boost module; A first film capacitor, arranged at a power supply terminal of the second Boost module; a second film capacitor, disposed at a power supply end of the load, for filtering the electrical signal output by the first Boost module and / or the second Boost module; A switch module, used to control the connection state between the output end of the first Boost module and the power supply end of the second Boost module; Wherein, when the switch module is disconnected, the DC signal is also used to charge the first thin film capacitor; when the switch module is closed, the DC signal is also used to charge the first thin film capacitor via the first Boost module; when the voltage value of the DC signal drops to a first set voltage value, the first thin film capacitor is used to supply power to the load via the second Boost module.

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 connected to an output end of the rectifier module; 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 second Boost module comprises: a second diode, wherein an anode of the second diode is connected to an output end of the rectifier module; a second inductor, wherein input ends of the second inductor are respectively connected to the cathode of the second diode and the first film capacitor; 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 third diode, wherein an anode of the third diode is connected to the output end of the second inductor, and a cathode of the third diode is connected to the load.

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

5. A control method for a power supply device according to any one of claims 1 to 4, characterized in that: The method comprises: Acquiring a voltage value of the direct current signal; When the switch module is in a closed state, obtaining a voltage value across the first film capacitor; Determining that the voltage value across the first film capacitor reaches a second set voltage value, then controlling the second Boost module to stop running; When it is determined that the voltage value of the direct current signal drops to the first set voltage value, the second Boost module is controlled to start.

6. The method according to claim 5, characterized in that The method further comprises: Determining that the voltage value of the DC signal reaches a DC voltage peak value, then controlling the switch module to close; When it is determined that the voltage value of the direct current signal rises to the voltage value across the first film capacitor, the switch module is controlled to be disconnected.

7. The method according to claim 5, characterized in that The first Boost module includes a first switch tube, and the method further includes: Based on a first duty cycle, the first switch tube is controlled to operate.

8. The method according to claim 5, characterized in that The second Boost module includes a second switch tube, and the controlling the second Boost module to stop running includes: Controlling the second switch tube to be cut off; The controlling the second Boost module to start includes: Based on the second duty cycle, the second switch tube is controlled to operate.

9. An electronic device, characterized in that: The electronic device comprises the power supply device according to any one of claims 1 to 4, 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 5 to 8 when running a computer program.

10. 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 5 to 8 are implemented.

11. 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 5 to 8 are implemented.

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