Power supply device and air conditioning apparatus

Abstract

This application discloses a power supply device, comprising: a rectifier circuit for rectifying alternating current into pulsed direct current; a spike suppression circuit comprising: an absorption resistor, the first end of which is electrically connected to the rectifier circuit; an isolating switch, the switching path of which is connected in parallel with the absorption resistor; a boost power factor correction circuit comprising: a boost converter unit comprising: a boost inductor, the second end of which is electrically connected to the absorption resistor; a power switch, one end of which is electrically connected to the boost inductor and the other end is grounded; a boost diode, one anode of which is electrically connected to the switching path of the power switch and the other anode of which is electrically connected to the boost inductor; an output capacitor, the positive terminal of which is electrically connected to the cathode of the boost diode and the negative terminal of which is grounded; and a control circuit electrically connected to the control terminal of the power switch; and also provides an air conditioning device; this application limits the sudden change of current through the spike suppression circuit, thereby playing a damping role, absorbing part of the spike energy, and preventing the PFC control loop from failing.

Description

Technical Field

[0001] This application relates to the field of air conditioning equipment technology, and more particularly to a power supply device and an air conditioning device. Background Technology

[0002] Boost-PFC (Boost-Power Factor Correction) is a power electronic circuit used to improve the power factor, typically found in AC-DC converters. Boost-PFC converts input alternating current (AC) to direct current (DC) and improves the power factor in the process, bringing it as close to 1 as possible. In air conditioning equipment, especially central air conditioning systems, the operating characteristics of the compressor and other motors introduce harmonics. Improving the power factor can reduce the load on the power grid and improve power quality.

[0003] However, if the power supply voltage suddenly jumps from 310V (peak) to 380V or even higher, the PFC circuit cannot effectively control the power supply because the input voltage exceeds its designed operating range. PFC improves the power factor and reduces harmonic interference by adjusting the input current waveform to match the voltage waveform. However, when the power supply voltage suddenly increases, the input current surges instantaneously, causing the PFC control loop to fail. The control circuit enters a protection or shutdown state, unable to continue adjusting the current waveform. The powered equipment may also stop operating due to overcurrent protection activation. In severe cases, it may even cause hardware damage such as component overheating and insulation breakdown, affecting overall safety.

[0004] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Utility Model Content

[0005] To address the issue that when the AC power supply voltage suddenly increases, the input current will surge instantaneously, causing the PFC control loop to fail, the control circuit to enter a protection or shutdown state, and the current waveform cannot be adjusted any further. The powered equipment may also stop operating due to overcurrent protection activation. In severe cases, it may also cause hardware damage such as component overheating and insulation breakdown, affecting overall safety. Therefore, a power supply device is designed and provided.

[0006] The power supply unit includes a rectifier circuit, a spike suppression circuit, a boost power factor correction circuit, and a control circuit. The rectifier circuit rectifies AC power into pulsed DC power. The spike suppression circuit includes an absorption resistor and an isolating switch. The first end of the absorption resistor is electrically connected to the rectifier circuit, and the switching path of the isolating switch is connected in parallel with the absorption resistor. The boost power factor correction circuit includes a boost converter unit and an output capacitor. The boost converter unit includes a boost inductor, a power switch, and a boost diode. The boost inductor is electrically connected to the second end of the absorption resistor. One end of the switching path of the power switch is electrically connected to the boost inductor, and the other end is grounded. One anode of the boost diode is electrically connected to the switching path of the power switch, and the other end is electrically connected to the boost inductor. The positive terminal of the output capacitor is electrically connected to the cathode of the boost diode, and the negative terminal is grounded. The control circuit is electrically connected to the control terminal of the power switch.

[0007] The above technical solution has the following advantages or beneficial effects: by using a disconnecting switch and an absorption resistor to suppress spikes, the switching path of the disconnecting switch is open, the absorption resistor is bypassed, and the boost power factor correction circuit remains in normal operation; when the switching path of the disconnecting switch is closed, the absorption resistor is connected, and the absorption resistor can limit the sudden change of current, play a certain damping role, absorb part of the spike energy, and avoid PFC control loop failure.

[0008] In some embodiments of this application, the boost power factor correction circuit includes: a plurality of boost converter units, which are connected in parallel.

[0009] The above technical solution has the following advantages or beneficial effects: the switching signals of each boost converter unit are staggered by a certain angle; for example, 180° or 120°, so that the ripples of the input current and the output current can be canceled out by phase interleaving; at the same time, the current of each boost converter unit is small, the electrical stress on the inductor and power switch is reduced, and the reliability of the power supply device is improved.

[0010] In some embodiments of this application, the boost converter unit includes: a first boost converter unit and a second boost converter unit; the first boost converter unit includes: a first boost inductor electrically connected to the second terminal of the absorption resistor; a first power switch, one end of the switching path of the first power switch electrically connected to the first boost inductor and the other end grounded; a first boost diode, one anode of which is electrically connected to the switching path of the first power switch and the other end electrically connected to the first boost inductor; the second boost converter unit includes: a second boost inductor electrically connected to the second terminal of the absorption resistor; a second power switch, one end of the switching path of the second power switch electrically connected to the second boost inductor and the other end grounded; a second boost diode, one anode of which is electrically connected to the switching path of the second power switch and the other end electrically connected to the second boost inductor; the boost power factor correction circuit further includes: an output capacitor, the positive terminal of which is electrically connected to the cathodes of the first boost diode and the second boost diode respectively, and the negative terminal of which is grounded; the control circuit is electrically connected to the control terminals of the first power switch and the second power switch respectively.

[0011] The above technical solution has the following advantages or beneficial effects: the shared output capacitor can simplify the design, the voltage is uniform, and it is convenient for subsequent circuit connections.

[0012] In some embodiments of this application, the boost converter unit includes: a first boost converter unit and a second boost converter unit; the first boost converter unit includes: a first boost inductor electrically connected to the second terminal of the snubber resistor; a first power switch transistor, one end of the switching path of the first power switch transistor being electrically connected to the first boost inductor, and the other end being grounded; a first boost diode, one anode of which is electrically connected to the switching path of the first power switch transistor, and the other end being electrically connected to the first boost inductor; the second boost converter unit includes: a second boost inductor electrically connected to the second terminal of the snubber resistor; a second power switch transistor, the second power switch transistor being electrically connected to the second terminal of the snubber resistor; and a second power switch transistor being electrically connected to the second terminal of the snubber resistor. One end of the switching path of the switching transistor is electrically connected to the second boost inductor, and the other end is grounded; the anode of the second boost diode is electrically connected to the switching path of the second power switching transistor in one path and to the second boost inductor in the other path; the boost power factor correction circuit further includes: a first output capacitor, the positive terminal of the first output capacitor is electrically connected to the first boost diode, and the negative terminal of the first output capacitor is grounded; a second output capacitor, the positive terminal of the second output capacitor is electrically connected to the second boost diode, and the negative terminal of the second output capacitor is grounded; the control circuit is electrically connected to the control terminals of the first power switching transistor and the second power switching transistor respectively.

[0013] The above technical solution has the following advantages or beneficial effects: the independently designed first and second output capacitors can reduce inter-phase interference, current ripple and voltage fluctuations will not affect other phases, reduce inter-phase electromagnetic interference and coupling, and each phase output capacitor directly filters the output of its own phase, resulting in fast response speed and helping to quickly suppress the voltage ripple of its own phase.

[0014] In some embodiments of this application, the disconnecting switch is a relay; a set of contacts of the relay are connected in parallel with the absorption resistor; one end of the relay coil is electrically connected to the control signal input terminal, and the other end is connected to the power supply voltage terminal; when the contacts are closed, the switching path of the disconnecting switch is turned on, and the absorption resistor is bypassed; when the contacts are open, the switching path of the disconnecting switch is turned off, and the absorption resistor is electrically connected to the rectifier circuit and the boost converter unit.

[0015] The above technical solution has the following advantages or beneficial effects: as an isolating switch, the relay can achieve effective electrical isolation and high-current switching control, effectively protect the power supply device, especially protect the components at the control signal input terminal from direct impact of high voltage or high current.

[0016] In some embodiments of this application, the disconnecting switch is an optocoupler, comprising: a light-emitting diode (LED) located on the input side of the optocoupler; the cathode of the LED is electrically connected to a control signal input terminal via a current-limiting protection resistor, and the anode of the LED is electrically connected to a power supply voltage terminal; a phototransistor located on the output side of the optocoupler, the switching path of the phototransistor being connected in parallel with the absorption resistor; when the switching path of the phototransistor is turned on, the switching path of the disconnecting switch is turned on, and the absorption resistor is bypassed; when the switching path of the phototransistor is turned off, the switching path of the disconnecting switch is turned off, and the absorption resistor is electrically connected to the rectifier circuit and the boost converter unit.

[0017] The above technical solution has the following advantages or beneficial effects: the optocoupler can reduce noise coupling and has no mechanical wear; it has the advantages of longer life and smaller size.

[0018] In some embodiments of this application, the power supply device further includes a sampling circuit, comprising: a sampling resistor, the first end of which is electrically connected to the rectifier circuit, and the second end of which is electrically connected to the boost converter unit; an RC filter circuit, comprising: a first filter resistor, the first end of which is electrically connected to the first end of the sampling resistor; a second filter resistor, the first end of which is electrically connected to the second end of the sampling resistor; a filter capacitor, which is respectively connected to the second ends of the first filter resistor and the second end of the second filter resistor; a differential amplifier circuit, comprising: an operational amplifier, the inverting input terminal of which is electrically connected to the second end of the first filter resistor through the first resistor, and the non-inverting input terminal of which is electrically connected to the second end of the second filter resistor through the second resistor; a third resistor, the first end of which is electrically connected to the non-inverting input terminal of the operational amplifier, and the second end of which is electrically connected to the power supply voltage terminal; a fourth resistor, the first end of which is electrically connected to the inverting input terminal of the operational amplifier, and the second end of which is electrically connected to the output terminal of the operational amplifier; and a first capacitor, the positive terminal of which is connected to the output terminal of the operational amplifier, and the negative terminal of which is grounded.

[0019] The above technical solution has the following advantages or beneficial effects: the sampling circuit amplifies the voltage across the sampling resistor in a differential amplification manner, suppresses mode interference, and accurately detects the current of the power switching transistor.

[0020] In some embodiments of this application, the power supply device further includes a protection circuit, comprising: a first thermistor, one end of which is electrically connected to the AC power supply and the rectifier circuit respectively, and the other end of which is grounded; and a second thermistor, one end of which is electrically connected to the boost converter unit, and the other end of which is grounded.

[0021] The above technical solution has the following advantages or beneficial effects: the protection circuit reduces the thermal and electrical stress of components, extends the service life of rectifier circuits, capacitors and other components, and can also reduce electromagnetic interference when the power supply is turned on.

[0022] In some embodiments of this application, the power supply device further includes a post-stage filter circuit, which includes: a post-stage filter capacitor connected in parallel with the second thermistor; and a post-stage filter resistor connected in parallel with the second thermistor.

[0023] The above technical solution has the following advantages or beneficial effects: the post-stage filter circuit can filter out high-frequency noise and spike interference, and improve the electromagnetic compatibility of the power supply device.

[0024] A second aspect of this application also provides an air conditioning device, including a power supply unit. The power supply unit includes a rectifier circuit, a spike suppression circuit, a boost power factor correction circuit, and a control circuit. The rectifier circuit is used to rectify alternating current into pulsed direct current. The spike suppression circuit includes an absorption resistor and an isolating switch. A first end of the absorption resistor is electrically connected to the rectifier circuit, and the switching path of the isolating switch is connected in parallel with the absorption resistor. The boost power factor correction circuit includes a boost converter unit and an output capacitor. The boost converter unit includes a boost inductor, a power switch, and a boost diode. The boost inductor is electrically connected to a second end of the absorption resistor. One end of the switching path of the power switch is electrically connected to the boost inductor, and the other end is grounded. One anode of the boost diode is electrically connected to the switching path of the power switch, and the other end is electrically connected to the boost inductor. The positive terminal of the output capacitor is electrically connected to the cathode of the boost diode, and the negative terminal is grounded. The control circuit is electrically connected to the control terminal of the power switch.

[0025] The above technical solution has the following advantages or beneficial effects: On the one hand, the power supply device can meet the strict requirements of the power grid for power factor and harmonics, and reduce power grid pollution; on the other hand, the boost power factor correction circuit can operate stably and will not be affected by sudden voltage increases, effectively solving the problem that the air conditioning equipment may stop operating due to overcurrent protection due to the failure of the PFC control loop. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a power supply device provided in some embodiments of this application;

[0028] Figure 2 This is a schematic diagram illustrating the operating principle of the control circuit in a power supply device provided in some embodiments of this application;

[0029] Figure 3 Circuit diagrams of power supply devices provided in some embodiments of this application;

[0030] Figure 4 Circuit diagrams of power supply devices provided for other embodiments of this application;

[0031] Figure 5 Waveform of the input voltage for existing technology;

[0032] Figure 6 Waveform of the input current for existing technology;

[0033] Figure 7 Waveform diagrams of the input voltage of the power supply device provided in some embodiments of this application;

[0034] Figure 8 Waveform diagrams of the input current of the power supply device provided in some embodiments of this application;

[0035] Figure 9 This is a schematic diagram of the power supply device provided in other embodiments of this application;

[0036] Figure 10 Circuit diagrams of power supply devices provided for other embodiments of this application;

[0037] Figure 11 Circuit diagrams of power supply devices provided for other embodiments of this application;

[0038] Figure 12 This is a schematic diagram of the structure of an air conditioning device provided in some embodiments of this application. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0041] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "electrical connection" should be interpreted broadly. For example, they can refer to fixed electrical connections, detachable electrical connections, or integral electrical connections; they can refer to mechanical electrical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0045] When the power supply voltage instantaneously surges from 310V (peak) to 380V or even higher, the PFC circuit fails to provide effective control because the input voltage exceeds its designed operating range. The sudden surge in input current causes the PFC control loop to fail, the control circuit enters a protection or shutdown state, and cannot continue to adjust the current waveform; further, the powered equipment stops operating due to overcurrent protection activation, and in severe cases, it can cause hardware damage such as overheating and breakdown of components, affecting overall safety. This application designs and provides a power supply device with a boost power factor correction circuit. A power supply device with a boost power factor correction circuit can improve the power factor, reduce harmonic interference, and improve power quality. The power supply device first rectifies the AC mains power into DC power, and then boosts the DC voltage to a higher and more stable voltage through the boost power factor correction circuit for use by subsequent DC-DC conversion modules.

[0046] In some embodiments of this application, the power supply device can be applied to large equipment, such as serving as a power supply for the compressor of air conditioning equipment (including large central air conditioning equipment), meeting the stringent requirements of the power grid for power factor and harmonics, and reducing power grid pollution. In other embodiments of this application, the power supply device can be applied to consumer electronics products, such as projectors, televisions, game consoles, and audio equipment, improving power efficiency and reducing electromagnetic interference. In still other embodiments, the power supply device can be applied to lighting systems as an LED driver, extending the lifespan of the lamps. In yet another embodiment of this application, the power supply device can be applied to medical instruments, ensuring stable equipment operation and preventing power grid interference from affecting diagnosis and treatment.

[0047] In some embodiments of this application, such as Figure 1 As shown, the power supply device 10 includes a rectifier circuit 11, a boost power factor correction circuit 12, and a control circuit 13.

[0048] The rectifier circuit 11 is used to rectify alternating current (AC) into pulsating direct current (DC). The rectifier circuit 11 can be a diode bridge rectifier circuit 11. For example, the bridge rectifier circuit 11 includes a bridge circuit composed of four diodes. During the positive half-cycle of the AC power supply, two diodes conduct, and through the load resistor, the output current is in the positive direction. During the negative half-cycle of the AC power supply, the other two diodes conduct, and through the load resistor, the output current is still in the positive direction. Thus, the AC power is rectified into pulsating DC with a constant output current direction but a voltage magnitude that varies with time.

[0049] The boost power factor correction circuit 12 is used to synchronize the input current and input voltage, that is, to synchronize the sinusoidal waveform of the input current with the sinusoidal waveform of the input voltage, thereby improving the power factor and reducing harmonic interference; at the same time, it boosts the rectified pulsating DC voltage to a higher and more stable DC voltage.

[0050] In some embodiments of this application, the boost power factor correction circuit 12 includes a boost converter unit 121. The boost converter unit 121 includes a boost inductor 122, a power switch 123, and a boost diode 124. The boost power factor correction circuit 12 also includes an output capacitor 125. In the boost converter unit 121, one end of the switching path of the power switch 123 is electrically connected to the boost inductor 122, for example, the first end of the boost inductor 122; one anode of the boost diode 124 is electrically connected to the switching path of the power switch 123, and the other end is electrically connected to the boost inductor 122, for example, the first end of the boost inductor 122; the positive terminal of the output capacitor 125 is electrically connected to the cathode of the boost diode 124, and the negative terminal is grounded; the control terminal of the power switch 123 is electrically connected to the control circuit 13.

[0051] When the switching path of power switch 123 is turned on, the voltage across boost inductor 122 is the input voltage, and the current in boost inductor 122 rises linearly, storing energy. At this time, boost diode 124 is cut off, and output capacitor 125 discharges. When the switching path of power switch 123 is turned off, the current in boost inductor 122 cannot change instantaneously. The current flows through boost diode 124 to output capacitor 125, boost inductor 122 releases the stored energy, and the output voltage increases. By adjusting the duty cycle of the power switch, the instantaneous value of the input current is proportional to the instantaneous value of the input voltage, the input current waveform is close to a sine wave, and the power factor is close to 1. Taking IGBT as an example, the gate of power switch 123 is electrically connected to control circuit 13, the emitter is grounded, one collector is electrically connected to boost inductor 122, and the other is electrically connected to the anode of boost diode 124.

[0052] The power supply unit 10 also includes a spike suppression circuit 14, which absorbs voltage spikes. The spike suppression circuit 14 includes an absorption resistor 141 and an isolating switch 142; the first terminal of the absorption resistor 141 is electrically connected to the rectifier circuit 11, and the second terminal of the absorption resistor 141 is electrically connected to the boost converter unit 121, for example, to the second terminal of the boost inductor 122. The switching path of the isolating switch 142 is connected in parallel with the absorption resistor 141. When the switching path of the isolating switch 142 is on, the absorption resistor 141 is bypassed, and the boost power factor correction circuit 12 continues to operate normally; when the switching path of the isolating switch 142 is off, the absorption resistor 141 is connected, and the absorption resistor 141 can limit sudden changes in current, playing a certain damping role and absorbing part of the spike energy. Figure 5 and Figure 6 As shown, without adding the spike suppression circuit 14, the current distortion is greater than 100A when the voltage suddenly increases by 80V; Figure 7 and Figure 8 As shown, after adding the spike suppression circuit 14, the current does not change abruptly, and the current of the absorption resistor 141 does not change significantly after it is bypassed (i.e., after the circuit is restored).

[0053] For example, such as Figure 2 As shown, the control circuit employs a dual-loop control strategy of current loop and voltage loop to achieve a high power factor and stable output voltage. The voltage loop regulates the output voltage, stabilizing it at a set value. Specifically, it generates a voltage error signal by measuring the output voltage and comparing it with a reference voltage. This voltage error signal is then processed by a PI (proportional-integral) controller to output a current reference value. The current loop controls the input current, ensuring it tracks the current reference value generated by the voltage loop. Specifically, it generates a current error signal by measuring the boost inductor current and comparing it with the current reference value. This current error signal is then processed by a PI (proportional-integral) controller to adjust the duty cycle, thereby controlling the on-time of the power switch.

[0054] exist Figure 2 In the middle, V dc_ref The output voltage reference value, i.e., the desired DC output voltage, V dc_mea V is the actual measured output voltage. ac_mea I represents the actual measured input AC voltage (instantaneous value). ac_mea The current loop contains the actual measured boost inductor current. The voltage loop includes a proportional controller (KP) and an integral controller (KI) to regulate the output voltage. The current loop also includes a proportional controller (KP) and an integral controller (KI) to regulate the input current. Voltage feedforward directly introduces the voltage signal into the current reference to compensate for input voltage changes in advance. The multiplier multiplies the current reference output from the voltage loop with the input voltage signal to generate an instantaneous current reference. The output duty cycle is the PWM duty cycle signal, controlling the conduction of the power switching transistor.

[0055] The voltage loop is the outer loop, and its input is the output voltage reference value V. dc_ref and the actual measured output voltage V dc_mea The voltage error e is calculated using a subtractor. v =V dc_ref -V dc_mea Voltage error e v After passing through the proportional controller KP and the integral controller KI, the output current amplitude reference signal I is obtained. ac_ref , that is Figure 2 The signal output from the medium voltage loop to the multiplier represents the ideal input current amplitude, used to ensure stable output voltage.

[0056] The input to the voltage feedforward is the actual measured AC voltage V. ac_mea Input AC voltage V ac_mea After a constant ( Figure 2 (Taking 1 as an example) After amplification, it is directly fed into the multiplier. Voltage feedforward compares the input voltage signal with the current amplitude reference signal I output from the voltage loop. ac_ref Multiply to generate instantaneous current reference signal I. ref (t). I ref (t)= I ac_ref* V ac_mea Voltage feedforward enables the current reference signal to dynamically reflect instantaneous changes in the input voltage. Voltage feedforward can also utilize V... dc_mea For V ac_mea Normalization or adjustment is performed to convert the voltage signal into a dimensionless scaling factor, and an instantaneous current reference signal is generated based on this factor. Figure 2 As shown.

[0057] The current loop is the inner loop, and the input of the current loop is the instantaneous current reference signal I. ref (t) and the actual measured boost inductor current I ac_meaThe current error e is calculated using a subtractor. i = I ref (t)-I ac_mea Current error e i After passing through the proportional controller KP and the integral controller KI, the output PWM duty cycle signal (DUTY) is generated. The duty cycle signal further controls the conduction time of the power switch and adjusts the boost inductor current. By adjusting the duty cycle, the input current tracks the current reference, ensuring stable output voltage and good input current waveform.

[0058] Dual-loop control can be implemented by commercially available PFC control circuits, such as TI's dedicated APFC rectifier control circuit UCC28019, forming a dual-loop control with an outer voltage loop and an inner current loop. Dual-loop control is a built-in function of commercially available PFC control circuits and is not the focus of this application, so it will not be elaborated here.

[0059] like Figure 3 As shown, in some embodiments of this application, the power supply device further includes a sampling circuit. The sampling circuit includes a sampling resistor R_sample, an RC filter circuit, and a differential amplifier circuit.

[0060] The first terminal of the sampling resistor R_sample is electrically connected to the rectifier circuit, and the second terminal is electrically connected to the boost converter unit, such as the power switch IGBT1. The current of the power switch IGBT1 is further detected by measuring the voltage drop across the sampling resistor R_sample.

[0061] The RC filter circuit includes a first filter resistor R12, a second filter resistor R13, and a filter capacitor C8. The first terminal of the first filter resistor R12 is electrically connected to the first terminal of the sampling resistor R_sample, and the second terminal of the first filter resistor R12 is electrically connected to the filter capacitor C8. The first terminal of the second filter resistor R13 is electrically connected to the second terminal of the sampling resistor R_sample, and the second terminal of the second filter resistor R13 is electrically connected to the filter capacitor C8, thus forming an RC filter circuit to filter out high-frequency noise.

[0062] The differential amplifier circuit includes operational amplifier IC1B, a first resistor R15, a second resistor R14, a third resistor R16, a fourth resistor R17, and a first capacitor C9. The inverting input of operational amplifier IC1B is electrically connected to the second terminal of the first filter resistor R12 through the first resistor R15, and the non-inverting input of operational amplifier IC1B is electrically connected to the second terminal of the second filter resistor R13 through the second resistor R14. The first terminal of the third resistor R16 is electrically connected to the non-inverting input of operational amplifier IC1B, and the second terminal of the third resistor R16 is electrically connected to the power supply voltage terminal (+5V) to adjust the input bias and ensure that operational amplifier IC1B operates in the linear region. The first terminal of the fourth resistor R17 is electrically connected to the inverting input of operational amplifier IC1B, and the second terminal of the fourth resistor R17 is electrically connected to the output terminal of operational amplifier IC1B. The fourth resistor R17 serves as a feedback resistor to ensure accurate and stable voltage signal amplification. The positive terminal of the first capacitor C9 is connected to the output terminal of operational amplifier IC1B, and the negative terminal of the first capacitor C9 is grounded. The differential amplifier circuit amplifies the voltage across the sampling resistor R_sample in a differential amplification manner, suppressing common-mode interference and improving the accuracy of the detection signal.

[0063] In some embodiments of this application, the power supply device further includes a DC-DC converter circuit (not shown), which is electrically connected to a boost power factor correction circuit. Based on the stable DC voltage output by the boost power factor correction circuit, the DC-DC converter circuit performs buck, boost, or isolation conversion to obtain the desired output voltage.

[0064] In some embodiments of this application, the power supply device further includes a protection circuit, which includes a first thermistor Z1 and a second thermistor Z2. One end of the first thermistor Z1 is electrically connected to the AC power supply and the rectifier circuit, respectively, and the other end is grounded; one end of the second thermistor Z2 is electrically connected to the boost converter unit, for example, electrically connected to the output capacitor CB1, and the other end is grounded; the first thermistor Z1 and the second thermistor Z2 limit the surge current, reduce the thermal and electrical stress on the components, extend the service life of the rectifier circuit, capacitors and other components, and can also reduce electromagnetic interference when the power supply is turned on.

[0065] In some embodiments of this application, the power supply device further includes a post-stage filter circuit, which includes a post-stage filter capacitor C10 and a post-stage filter resistor RL. The post-stage filter capacitor C10 and the post-stage filter resistor RL are connected in parallel with the second thermistor Z2 to form a RC filter network. The post-stage filter circuit can filter out high-frequency noise and spike interference, and improve the electromagnetic compatibility of the power supply device.

[0066] like Figure 3As shown, in some embodiments of this application, the disconnecting switch is a relay RLY1. A set of contacts of relay RLY1 is connected in parallel with the absorption resistor R3. One end of the coil of relay RLY1 is electrically connected to the control signal input terminal Rly_Con, and the other end is electrically connected to the power supply voltage terminal (e.g., +5V). By changing the energizing state of the relay RLY1 coil, the contacts of relay RLY1 are switched between closed and open. When the contacts are closed, the switching path of the disconnecting switch is open, the absorption resistor R3 is bypassed, and the boost power factor correction circuit continues to operate normally. When the contacts are open, the switching path of the disconnecting switch is closed, the absorption resistor R3 is electrically connected to the rectifier circuit and the boost inductor L1, and the absorption resistor R3 consumes the energy of the voltage spike oscillation and suppresses the spike.

[0067] For example, a set of normally open contacts of relay RLY1 are connected in parallel with absorption resistor R3. One end of the coil of relay RLY1 is electrically connected to the control signal input terminal Rly_Con, and the other end is electrically connected to the power supply voltage terminal (e.g., +5V). When the coil of relay RLY1 is energized, the normally open contacts close, the switching path of the isolating switch is turned on, the absorption resistor R3 is bypassed, and the boost power factor correction circuit continues to operate normally. When the coil of relay RLY1 is de-energized, the normally open contacts open, the switching path of the isolating switch is turned off, the absorption resistor R3 is electrically connected to the rectifier circuit and the boost inductor L1, and the absorption resistor R3 consumes the energy of the voltage spike oscillation and suppresses the spike.

[0068] For example, a set of normally closed contacts of relay RLY1 are connected in parallel with absorption resistor R3. One end of the coil of relay RLY1 is electrically connected to the control signal input terminal Rly_Con, and the other end is electrically connected to the power supply voltage terminal (e.g., +5V). When the coil of relay RLY1 is de-energized, the normally closed contacts close, the switching path of the isolating switch is turned on, the absorption resistor R3 is bypassed, and the boost power factor correction circuit continues to operate normally. When the coil of relay RLY1 is energized, the normally closed contacts open, the switching path of the isolating switch is turned off, the absorption resistor R3 is electrically connected to the rectifier circuit and the boost inductor L1, and the absorption resistor R3 consumes the energy of the voltage spike oscillation and suppresses the spike.

[0069] In some embodiments of this application, a freewheeling diode D8 is also included. The anode of the freewheeling diode D8 is connected to the control signal input terminal Rly_Con, and the cathode of the freewheeling diode D8 is connected to the power supply voltage terminal. The freewheeling diode D8 is used to suppress the reverse high voltage spike generated when the coil of the relay RLY1 is de-energized, thereby protecting the chip at the control signal input terminal Rly_Con.

[0070] In some embodiments of this application, the first drive signal output from the control signal input terminal Rly_Con, used to drive the coil of relay RLY1 to be energized and the normally closed contact to be opened, can be implemented based on a combination of a first comparator and a differentiating circuit. That is, the combination of the first comparator and the differentiating circuit is used to detect the rapid rise of the voltage signal and determine whether it exceeds a threshold.

[0071] Specifically, the actual measured input AC voltage V ac_mea The input is a differentiating circuit; the differentiating circuit generates a pulse when the voltage rises rapidly; the output of the differentiating circuit is electrically connected to the first input of a first comparator, and the second input of the first comparator receives a first set signal corresponding to a threshold voltage, such as 40V; the first comparator compares the differentiating signal with the first set signal to identify whether it is a valid spike; when a valid spike occurs, that is, when the output of the differentiating circuit is higher than the threshold voltage corresponding to the first set signal, a first drive signal is output to the control signal input terminal Rly_Con. Taking a normally closed contact as an example, the first drive signal energizes the coil of relay RLY1, the normally closed contact of relay RLY1 opens, the switching path of the isolating switch is turned off, the absorption resistor R3 is electrically connected to the rectifier circuit and the boost inductor L1, and the absorption resistor R3 consumes the energy of the spike voltage oscillation and suppresses the spike. For example, a monostable trigger can also be set downstream of the comparator to convert the short pulse output by the comparator into a fixed-width pulse to prevent relay RLY1 from frequently operating due to excessively short pulses or jitter. A peak hold circuit can also be set downstream of the first comparator to keep the normally closed contact of relay RLY1 open.

[0072] In some embodiments of this application, the first drive signal output from the control signal input terminal Rly_Con, used to energize the coil of relay RLY1 and open its normally closed contact, can be implemented based on a combination of digital sampling and a microcontroller. That is, the input AC voltage V is sampled via an ADC. ac_mea The microcontroller calculates the difference between consecutive sampling points to identify whether there is a rapid increase in voltage, and controls the relay RLY1 to operate based on the identification result.

[0073] Specifically, the microcontroller (MCU) periodically samples the input voltage signal and calculates the difference ΔVac between the current sample value and the previous sample value. If the difference ΔVac exceeds the set threshold, the microcontroller outputs the first drive signal to the control signal input terminal Rly_Con, which drives the coil of relay RLY1 to be energized, and the normally closed contact of relay RLY1 opens.

[0074] The second drive signal output from the control signal input terminal Rly_Con, used to drive the coil of relay RLY1 to switch from energized to de-energized, and the normally closed contact to switch from closed to open again, can be implemented based on a combination of a peak detection circuit, a dynamic threshold generation circuit, and a second comparator. The peak hold circuit is used to detect and hold the peak value V of the actually measured input AC voltage in real time. ac_max The peak hold circuit can be implemented using a dedicated peak hold chip; the dynamic threshold generation circuit uses a proportional amplifier circuit composed of operational amplifier IC1B to generate the peak value V of the actual measured input AC voltage. ac_max Multiply by a constant (e.g., less than 1, say 0.1) to generate a dynamic threshold K. _gain *V ac_max The output of the dynamic threshold generation circuit is electrically connected to the first input of the second comparator, and the second input of the second comparator is the actual measured input AC voltage V. ac_mea The second comparator actually measures the input AC voltage V. ac_mea The actual measured input AC voltage V is identified by comparing it with the dynamic threshold generated by the dynamic threshold generation circuit. ac_mea Whether it is below the dynamic threshold; based on the actual measured input AC voltage V. ac_mea When the load falls below the dynamic threshold, a second drive signal is output to de-energize the coil of relay RLY1. The normally closed contact of relay RLY1 then switches from open to closed, restoring the normal operation of the boost power factor correction circuit. The dynamic threshold reduces current overshoot caused by a decrease in load, ensuring a stable current transition.

[0075] For example, a logic gate circuit can be added. One input of the logic gate is connected to the output of the first comparator, and the other input is connected to the output of the second comparator. When the first comparator does not output the first drive signal, and the second comparator outputs the second drive signal, a drive signal is output to de-energize the coil of relay RLY1. The normally closed contact of relay RLY1 switches from open to closed, restoring the normal operation of the boost power factor correction circuit. That is, when no voltage spike is detected and the actual measured input AC voltage is lower than the dynamic threshold, the normal operation of the power factor correction circuit is restored.

[0076] In some embodiments of this application, the second drive signal output from the control signal input terminal Rly_Con, used to drive the coil of relay RLY1 to switch from energized to de-energized, and the normally closed contact to switch from closed to open, can be implemented based on a combination of digital sampling and a microcontroller. That is, the microprocessor samples the input AC voltage V. ac_mea From this, the peak value V of the input AC voltage can be identified. ac_max And calculate the dynamic threshold K _gain *Vac_max The microcontroller compares the input AC voltage V. ac_mea and dynamic threshold K _gain *V ac_max In the actual measured input AC voltage V ac_mea When the voltage drops below the dynamic threshold, a second drive signal is output to de-energize the coil of relay RLY1. The normally closed contact of relay RLY1 then switches from open to closed, restoring the normal operation of the boost power factor correction circuit. The microcontroller can also operate on the actual measured input AC voltage V. ac_mea When the value is below the dynamic threshold and the difference ΔVac is below the set threshold, a drive signal is output to energize the coil of relay RLY1, causing the normally closed contact of relay RLY1 to open.

[0077] The first and second comparators are preferably high-speed comparators. Figure 3 In the diagram, D5 represents a boost diode.

[0078] like Figure 4 As shown, in some embodiments of this application, the isolating switch is an optocoupler PC1; the optocoupler PC1 includes an input-side light-emitting diode (LED) and an output-side phototransistor; the switching path of the phototransistor is connected in parallel with the absorption resistor R3, the cathode of the LED is electrically connected to the control signal input terminal PC-Con through the current-limiting protection resistor R4, and the anode of the LED is electrically connected to the power supply voltage terminal (+5V); by changing the light-emitting state of the LED, i.e., turning the LED on or off, the phototransistor switches between conduction and cutoff, and the switching path of the phototransistor switches between closed and conduction. When the LED illuminates the base region of the phototransistor, it excites the switching path of the phototransistor to conduct, i.e., the switching path of the isolating switch is conducted, the absorption resistor R3 is bypassed, and the boost power factor correction circuit maintains normal operation; conversely, when the LED is off, the switching path of the phototransistor is open, i.e., the switching path of the isolating switch is closed, the absorption resistor R3 is electrically connected to the rectifier circuit and the boost inductor L1, and the absorption resistor R3 consumes the energy of the voltage spike oscillation and suppresses the spike. The optocoupler PC1 isolates the control end and the controlled end, improving the safety and anti-interference capability of the power supply.

[0079] In some embodiments of this application, the first drive signal output from the control signal input terminal PC-Con, used to disconnect the switching path of the phototransistor in the optocoupler PC1, can be implemented based on a combination of a first comparator and a differentiating circuit. That is, the combination of the comparator and the differentiating circuit detects a rapid increase in voltage, i.e., a spike, and outputs a digital pulse signal, which drives the light-emitting diode of the optocoupler PC1.

[0080] Specifically, the actual measured input AC voltage V ac_meaThe input is a differentiating circuit; the differentiating circuit generates a pulse when the voltage rises rapidly; the output of the differentiating circuit is electrically connected to the first input of the first comparator, and the second input of the first comparator receives a first set signal corresponding to the threshold voltage, for example, 40V; the first comparator compares the differentiating signal with the first set signal to identify whether it is a valid spike; when a valid spike occurs, that is, when the output of the differentiating circuit is higher than the threshold voltage corresponding to the first set signal, the first drive signal is output to the control signal input PC-Con, the switching path of the phototransistor is opened, that is, the switching path of the isolating switch is turned off, the absorption resistor R3 is electrically connected to the rectifier circuit and the boost inductor L1, and the absorption resistor R3 consumes the spike voltage oscillation energy and suppresses the spike.

[0081] In some embodiments of this application, the second drive signal output from the control signal input terminal PC-Con, used to turn on the switching path of the phototransistor in the optocoupler PC1, can be implemented based on a combination of a peak detection circuit, a dynamic threshold generation circuit, and a second comparator. The peak hold circuit is used to detect and hold the peak value V of the actually measured input AC voltage in real time. ac_max The peak hold circuit can be implemented using a dedicated peak hold chip; the dynamic threshold generation circuit uses a proportional amplifier circuit composed of operational amplifiers to generate the peak value V of the actual measured input AC voltage. ac_max Multiply by a constant (e.g., less than 1, say 0.1) to generate a dynamic threshold K. _gain *V ac_max The output of the dynamic threshold generation circuit is electrically connected to the first input of the second comparator, and the second input of the second comparator is the actual measured input AC voltage V. ac_mea The second comparator actually measures the input AC voltage V. ac_mea The actual measured input AC voltage V is identified by comparing it with the dynamic threshold generated by the dynamic threshold generation circuit. ac_mea Whether it is below the dynamic threshold; based on the actual measured input AC voltage V. ac_mea When the load falls below the dynamic threshold, a second drive signal is output to the control signal input terminal PC-Con, turning on the switching path of the phototransistor, which in turn turns on the switching path of the isolating switch. The absorption resistor R3 is bypassed, restoring the normal operation of the boost power factor correction circuit. The dynamic threshold reduces current overshoot caused by a decrease in load, ensuring a stable current transition.

[0082] For example, a logic gate circuit can be added. One input of the logic gate is connected to the output of the first comparator, and the other input is connected to the output of the second comparator. When the first comparator does not output the first drive signal, and the second comparator outputs the second drive signal, the drive signal is output to the control signal input terminal PC-Con. The switching path of the phototransistor is turned on, that is, the switching path of the isolating switch is turned on, the absorption resistor R3 is bypassed, and the normal operation of the boost power factor correction circuit is restored. In other words, when no voltage spike is detected and the actual measured input AC voltage is lower than the dynamic threshold, the normal operation of the power factor correction circuit is restored.

[0083] In some other embodiments of this application, the boost power factor correction circuit includes multiple boost converter units that operate in parallel. The switching signals of each boost converter unit are phase-shifted by a certain angle, such as 180° or 120°. The phase shifting achieves mutual cancellation of the ripples of the input current and the output current. At the same time, the current of each boost converter unit is small, the electrical stress on the inductor and the power switch is reduced, and the power supply reliability is improved.

[0084] like Figure 9 As shown, in some embodiments of this application, the boost converter unit includes a first boost converter unit 151 and a second boost converter unit 152. The boost power factor correction circuit also includes an output capacitor.

[0085] like Figure 10 and Figure 11 As shown, specifically, the first boost converter unit includes: a first boost inductor L1, a first power switch IGBT1, and a first boost diode D5; the second boost converter unit includes: a second boost inductor L2, a second power switch IGBT2, and a second boost diode D6.

[0086] In the first boost converter unit, one end of the switching path of the first power switch IGBT1 is electrically connected to the first terminal of the first boost inductor L1, and the other end is grounded; one anode of the first boost diode D5 is electrically connected to the switching path of the first power switch IGBT1, and the other end is electrically connected to the first terminal of the first boost inductor L1; in the second boost converter unit, one end of the switching path of the second power switch IGBT2 is electrically connected to the first terminal of the second boost inductor L2, and the other end is grounded. One anode of the second boost diode D6 is electrically connected to the switching path of the second power switch IGBT2, and the other end is electrically connected to the first terminal of the second boost inductor L2.

[0087] The positive terminal of the output capacitor CB1 is electrically connected to the cathodes of the first boost diode D5 and the second boost diode D6, while the negative terminals are grounded. The control terminals of the first power switch IGBT1 and the second power switch IGBT2 are electrically connected to the control circuit (as shown in the figure: IGBT1-PWM and IGBT2-PWM). The shared output capacitor CB1 simplifies the design, ensures uniform voltage, and facilitates subsequent circuit connections.

[0088] The power supply unit also includes a spike suppression circuit, which absorbs voltage spikes. The spike suppression circuit includes an absorption resistor R3 and a disconnecting switch; one end of the absorption resistor R3 is electrically connected to the rectifier circuit, and the other end is electrically connected to the second terminals of the first boost inductor L1 and the second boost inductor L2, respectively. The switching path of the disconnecting switch is connected in parallel with the absorption resistor R3. When the disconnecting switch is open, the absorption resistor R3 is bypassed, and the boost power factor correction circuit continues to operate normally; when the disconnecting switch is closed, the absorption resistor R3 is connected, which can limit sudden changes in current, playing a certain damping role and absorbing some of the spike energy.

[0089] The control circuit also adopts a dual-loop control strategy of current loop and voltage loop. The current loop outputs PWM signal to control the switching of the first power switch IGBT1 and the second power switch IGBT2 to achieve current tracking, uniform distribution of current in each phase, and phase offset of PWM signals in each phase to achieve mutual cancellation of current ripple.

[0090] The second terminal of the sampling resistor R_sample is electrically connected to the first power switch IGBT1 and the second power switch IGBT2, respectively; taking IGBT as an example, it is connected to its emitter. The isolating switch can be a relay RLY1 or an optocoupler PC1.

[0091] In other embodiments of this application, the boost converter unit includes a first boost converter unit and a second boost converter unit.

[0092] Specifically, the first boost converter unit includes: a first boost inductor, a first power switch, a first boost diode, and a first output capacitor; the second boost converter unit includes: a second boost inductor, a second power switch, a second boost diode, and a second output capacitor.

[0093] One end of the switching path of the first power switch is electrically connected to the first terminal of the first boost inductor, and the other end is grounded. One anode of the first boost diode is electrically connected to the switching path of the first power switch, and the other end is electrically connected to the first terminal of the first boost inductor. One end of the switching path of the second power switch is electrically connected to the first terminal of the second boost inductor, and the other end is grounded. One anode of the second boost diode is electrically connected to the switching path of the second power switch, and the other end is electrically connected to the first terminal of the second boost inductor.

[0094] The positive terminal of the first output capacitor is electrically connected to the cathode of the first boost diode, and the negative terminal of the first output capacitor is grounded. The positive terminal of the second output capacitor is electrically connected to the cathode of the second boost diode, and the negative terminal of the second output capacitor is grounded. The control terminals of the first and second power switches are electrically connected to the control circuit, respectively. The independently designed first and second output capacitors can reduce inter-phase interference, and current ripple and voltage fluctuations will not affect other phases, reducing inter-phase electromagnetic interference and coupling. Each phase output capacitor directly filters the output of its own phase, resulting in a fast response speed and facilitating rapid suppression of voltage ripple in that phase.

[0095] One end of the absorption resistor is electrically connected to the rectifier circuit, and the other end is electrically connected to the second terminals of the first and second boost inductors, respectively. The second terminal of the sampling resistor is electrically connected to the first and second power switching transistors, respectively; taking an IGBT as an example, it is connected to their emitters. One terminal of the second thermistor is connected to the first and second output capacitors, and the other terminal is grounded.

[0096] Dual-loop control can be implemented by commercially available PFC control circuits, such as TI's dedicated APFC rectifier control circuit UCC28019, forming a dual-loop control of voltage outer loop and current inner loop; this is not the focus of this application and will not be elaborated here.

[0097] like Figure 12 As shown, a second aspect of this application includes an air conditioning device 100, comprising a power supply device 10. The specific structure of the power supply device 10 is described in detail in the above embodiments and will not be repeated here.

[0098] In this application, the air conditioning equipment performs a refrigeration cycle by using a compressor, condenser, expansion valve, and evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation to cool or heat an indoor space.

[0099] Low-temperature, low-pressure refrigerant enters the compressor, which compresses it into a high-temperature, high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0100] The expansion valve expands the high-temperature, high-pressure liquid refrigerant that condenses in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioning unit regulates the temperature of the indoor space.

[0101] The outdoor unit of an air conditioning unit refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. The indoor unit of an air conditioning unit includes the indoor heat exchanger, and an expansion valve can be provided in either the indoor or outdoor unit.

[0102] Indoor and outdoor heat exchangers function as either condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioning unit functions as a heater in heating mode; when the indoor heat exchanger is used as an evaporator, the air conditioning unit functions as a cooler in cooling mode.

[0103] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0104] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A power supply device, comprising: A rectifier circuit is used to rectify alternating current into pulsed direct current. Its characteristic is that it further includes: Peak suppression circuit: It includes: An absorption resistor, the first end of which is electrically connected to the rectifier circuit; A disconnecting switch, wherein the switching path of the disconnecting switch is connected in parallel with the absorption resistor; A boost power factor correction circuit, comprising: Boost converter unit, comprising: A boost inductor, which is electrically connected to the second terminal of the absorption resistor; A power switching transistor, wherein one end of the switching path of the power switching transistor is electrically connected to the boost inductor, and the other end is grounded; A boost diode, wherein one anode of the boost diode is electrically connected to the switching path of the power switch transistor, and the other anode is electrically connected to the boost inductor; The positive terminal of the output capacitor is electrically connected to the cathode of the boost diode, and the negative terminal is grounded. The control circuit is electrically connected to the control terminal of the power switching transistor.

2. The power supply device according to claim 1, characterized in that, The boost power factor correction circuit includes: Multiple boost converter units are connected in parallel.

3. The power supply device according to claim 2, characterized in that, The boost converter unit includes: The first boost converter unit includes: The first boost inductor is electrically connected to the second terminal of the absorption resistor. The first power switch has one end of its switching path electrically connected to the first boost inductor and the other end grounded. The anode of the first boost diode is connected to the switching path of the first power switch transistor in one circuit and to the first boost inductor in the other circuit. The second boost converter unit includes: The second boost inductor is electrically connected to the second terminal of the absorption resistor; The second power switch has one end of its switching path electrically connected to the second boost inductor and the other end grounded. The anode of the second boost diode is connected to the switching path of the second power switch in one circuit and to the second boost inductor in the other circuit. The boost power factor correction circuit also includes: An output capacitor, the positive terminal of which is electrically connected to the cathodes of the first boost diode and the second boost diode, respectively, and the negative terminal of which is grounded; The control circuit is electrically connected to the control terminals of the first power switch and the second power switch, respectively.

4. The power supply device according to claim 2, characterized in that, The boost converter unit includes: The first boost converter unit includes: The first boost inductor is electrically connected to the second terminal of the absorption resistor; The first power switch has one end of its switching path electrically connected to the first boost inductor and the other end grounded. The anode of the first boost diode is connected to the switching path of the first power switch transistor in one circuit and to the first boost inductor in the other circuit. The second boost converter unit includes: The second boost inductor is electrically connected to the second terminal of the absorption resistor; The second power switch has one end of its switching path electrically connected to the second boost inductor and the other end grounded. The anode of the second boost diode is connected to the switching path of the second power switch in one circuit and to the second boost inductor in the other circuit. The boost power factor correction circuit also includes: A first output capacitor, the positive terminal of which is electrically connected to the first boost diode, and the negative terminal of which is grounded; a second output capacitor, the positive terminal of which is electrically connected to the second boost diode, and the negative terminal of which is grounded; The control circuit is electrically connected to the control terminals of the first power switch and the second power switch, respectively.

5. The power supply device according to any one of claims 1 to 4, characterized in that: The disconnecting switch is a relay; a set of contacts of the relay are connected in parallel with the absorption resistor; one end of the relay coil is electrically connected to the control signal input terminal, and the other end is connected to the power supply voltage terminal; when the contacts are closed, the switching path of the disconnecting switch is turned on, and the absorption resistor is bypassed; when the contacts are open, the switching path of the disconnecting switch is turned off, and the absorption resistor is electrically connected to the rectifier circuit and the boost converter unit.

6. The power supply device according to any one of claims 1 to 4, characterized in that: The disconnecting switch is an optocoupler, which includes: A light-emitting diode (LED) is located on the input side of the optocoupler; the cathode of the LED is electrically connected to the control signal input terminal through a current-limiting protection resistor, and the anode of the LED is electrically connected to the power supply voltage terminal. A phototransistor is located on the output side of the optocoupler, and the switching path of the phototransistor is connected in parallel with the absorption resistor; When the switching path of the phototransistor is turned on, the switching path of the isolating switch is turned on, and the absorption resistor is bypassed; when the switching path of the phototransistor is turned off, the switching path of the isolating switch is turned off, and the absorption resistor is electrically connected to the rectifier circuit and the boost converter unit.

7. The power supply device according to any one of claims 1 to 4, characterized in that, Also includes: The sampling circuit includes: The sampling resistor has its first end electrically connected to the rectifier circuit and its second end electrically connected to the boost converter unit. An RC filter circuit includes: The first filter resistor has its first terminal electrically connected to the first terminal of the sampling resistor; The first terminal of the second filter resistor is electrically connected to the second terminal of the sampling resistor. The filter capacitors are respectively connected to the second terminals of the first filter resistor and the second filter resistor; Differential amplifier circuit, comprising: An operational amplifier, wherein its inverting input terminal is electrically connected to the second terminal of the first filter resistor through a first resistor, and its non-inverting input terminal is electrically connected to the second terminal of the second filter resistor through a second resistor; The third resistor has its first end electrically connected to the non-inverting input terminal of the operational amplifier and its second end electrically connected to the power supply voltage terminal. A fourth resistor, the first end of which is electrically connected to the inverting input terminal of the operational amplifier, and the second end of which is electrically connected to the output terminal of the operational amplifier; and The first capacitor has its positive terminal connected to the output of the operational amplifier and its negative terminal grounded.

8. The power supply device according to any one of claims 1 to 4, characterized in that, Also includes: Protection circuit, which includes: The first thermistor has one end electrically connected to the AC power supply and the rectifier circuit, and the other end grounded. The second thermistor has one end electrically connected to the boost converter unit and the other end grounded.

9. The power supply device according to claim 8, characterized in that, Also includes: The subsequent filtering circuit includes: The subsequent filter capacitor is connected in parallel with the second thermistor; and The subsequent filter resistor is connected in parallel with the second thermistor.

10. An air conditioning device, characterized in that, Includes the power supply device as described in any one of claims 1 to 9.

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