A power control system and clothes drying machine

Abstract

The application relates to a power supply control system and a clothes airing machine, the power supply control system comprising an active power factor correction module, a flyback conversion module, a transformer module and a switch module; a first voltage output end of the transformer module is connected with a phase of a power input end of the flyback conversion module, and is used for supplying power for the flyback conversion module; a second voltage output end of the transformer module is connected to a power input end of the active power factor correction module through the switch module, and is used for selectively supplying power for the active power factor correction module based on the turn-on or turn-off of the switch module; compared with the prior art, the technical scheme of the application can reduce standby power consumption of a load when the load is in an idle state, and improve system stability.

Description

Technical Field

[0001] This application relates to the technical field of power control, and more particularly to a power control system and a clothes drying rack. Background Technology

[0002] As society's requirements for energy conservation continue to increase, the standards for standby power consumption of power supply equipment are becoming more and more stringent. In particular, in the field of home appliances, low power consumption has become one of the core indicators of product design.

[0003] With increasing energy-saving requirements, standby power consumption has become an important indicator. Existing electric clothes dryers and other equipment often use a two-stage architecture of "active power factor correction circuit + flyback converter circuit" to output constant voltage power supply to meet the power supply needs of lighting and motors and 3C certification.

[0004] However, in such solutions, the active power factor correction circuit continues to operate under no-load or light-load conditions, resulting in high standby power consumption, typically exceeding 2W. This makes it difficult to meet increasingly stringent energy efficiency standards. Furthermore, if the active power factor correction circuit and the flyback converter circuit share the same auxiliary winding power supply, a "power grab" phenomenon may occur, affecting system stability. Utility Model Content

[0005] This application provides a power control system and a clothes drying rack that can reduce the standby power consumption of the system when it is not in use and improve the system stability.

[0006] In a first aspect, this application provides a power control system, comprising: an active power factor correction module, a flyback converter module, a transformer module, and a switching module; the control output terminal of the flyback converter module is connected to the power input terminal of the transformer module for controlling the input of the transformer module; the first voltage output terminal of the transformer module is connected to the power input terminal of the flyback converter module for supplying power to the flyback converter module; the second voltage output terminal of the transformer module is connected to the power input terminal of the active power factor correction module through the switching module for selectively supplying power to the active power factor correction module based on the on or off state of the switching module.

[0007] In one possible implementation, the power control system provided in this application further includes: a control module; wherein the control module is electrically connected to the switch module and is used to output a control signal according to the system load state to control the switch module to be turned on or off; the control module is configured to output a first level signal to control the switch module to be turned off when the system load state is detected to be no load; the control module is configured to output a second level signal to control the switch module to be turned on when the system load state is detected to be loaded.

[0008] In one possible implementation, the switching module includes an isolation control unit and a switching transistor; the input terminal of the isolation control unit is connected to the output terminal of the control module for receiving the control signal output by the control module; the output terminal of the isolation control unit is connected to the control terminal of the switching transistor for controlling the switching on and off; the main circuit of the switching transistor is connected in series between the second voltage output terminal of the transformer module and the power input terminal of the active power factor correction module.

[0009] In one possible implementation, the transformer module includes an auxiliary winding unit, a first rectifier voltage limiting filter unit, and a second rectifier voltage limiting filter unit; the auxiliary winding unit forms a first supply voltage through the first rectifier voltage limiting filter unit, and the auxiliary winding unit forms a second supply voltage through the second rectifier voltage limiting filter unit; the first supply voltage is used to power the control chip in the flyback converter module, and the second supply voltage is used to power the control chip in the active power factor correction module.

[0010] In one possible implementation, the first rectifier voltage limiting filter unit includes a tenth diode, a seventeenth resistor, and a sixth electrolytic capacitor. The anode of the tenth diode is electrically connected to the auxiliary winding unit of the transformer module, and the cathode of the tenth diode is electrically connected to the positive terminal of the sixth electrolytic capacitor through the seventeenth resistor. The negative terminal of the sixth electrolytic capacitor is grounded, and the positive terminal of the sixth electrolytic capacitor outputs a first supply voltage. The second rectifier voltage limiting filter unit includes a ninth diode, a fifteenth resistor, and a fifth electrolytic capacitor. The anode of the ninth diode is electrically connected to the auxiliary winding unit of the transformer module, and the cathode of the ninth diode is electrically connected to the positive terminal of the fifth electrolytic capacitor through the fifteenth resistor. The negative terminal of the fifth electrolytic capacitor is grounded, and the positive terminal of the fifth electrolytic capacitor outputs a second supply voltage.

[0011] In one possible implementation, the power control system provided in this application further includes: a rectifier and filter module; the input terminal of the rectifier and filter module is used to receive an AC input signal; the DC bus voltage terminal of the rectifier and filter module is electrically connected to the active power factor correction module.

[0012] In one possible implementation, the flyback converter module includes a startup power supply unit, a flyback converter control chip, and a third switching transistor; one end of the startup power supply unit receives an AC input signal, and the other end is connected to the high-voltage pin of the flyback converter control chip to provide a high-voltage startup power supply for the flyback converter control chip; the flyback converter control chip controls the on / off state of the third switching transistor by outputting a drive signal to adjust the input of the transformer module.

[0013] In one possible implementation, the power control system provided in this application further includes: an output circuit module and a power module; wherein, the transformer module further includes a main winding; the main winding of the transformer module is electrically connected to the input terminal of the power module through the output circuit module, and the output terminal of the power module is connected to the power input terminal of the control module, for converting the voltage output by the main winding into a DC voltage to power the control module.

[0014] In one possible implementation, the power control system provided in this application further includes: a feedback control module; wherein the main winding of the transformer module is electrically connected to the input terminal of the feedback control module through the output circuit module, and the output terminal of the feedback control module is connected to the feedback terminal of the flyback converter module, for adjusting the output of the flyback converter module according to the output voltage and / or current of the load; wherein the feedback control module includes an optocoupler isolation unit and a sampling circuit; the sampling circuit is used to collect the output voltage and / or current of the system; the optocoupler isolation unit is used to isolate and transmit the sampling signal collected by the sampling circuit to the feedback terminal of the flyback converter module.

[0015] Secondly, this application provides a clothes drying rack, including a power control system as described in any of the above claims.

[0016] The technical solutions provided in this application have the following advantages compared with the prior art:

[0017] This application provides a power control system and a clothes drying rack, comprising: an active power factor correction module, a flyback converter module, a transformer module, and a switching module; the first voltage output terminal of the transformer module is connected to the power input terminal of the flyback converter module for supplying power to the flyback converter module; the second voltage output terminal of the transformer module is connected to the power input terminal of the active power factor correction module through the switching module, for selectively supplying power to the active power factor correction module based on the on or off state of the switching module; compared with the prior art, the technical solution of this application improves upon the prior art by... The intelligent control of the power supply to the active power factor correction module allows for the switching on to supply power to the module when high power output is required, ensuring a high power factor and low harmonics to meet certification requirements. Under light load or standby conditions, the switching module shuts off, stopping the active power factor correction module from operating. This reduces the no-load loss of the active power factor correction circuit under unnecessary conditions, significantly lowering the system's standby power consumption. Simultaneously, the independent power supply design of the transformer module's two voltage outputs avoids potential power contention between the active power factor correction circuit and the flyback converter module, improving system stability. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0019] 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, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0021] Figure 1 A schematic diagram of a power control system provided in this application;

[0022] Figure 2 A circuit structure diagram of a transformer module for a power control system provided in this application;

[0023] Figure 3 A schematic diagram of the circuit structure of a rectifier and filter module for a power control system provided in this application;

[0024] Figure 4 A schematic diagram of the circuit structure of a flyback converter module for a power control system provided in this application;

[0025] Figure 5 Another structural schematic diagram of a power control system provided in this application;

[0026] Figure 6 A circuit structure diagram of the control module and the switching module in a power control system provided in this application;

[0027] Figure 7 A schematic diagram of the circuit structure of an active power factor correction module for a power control system provided in this application;

[0028] Figure 8 A schematic diagram of the circuit structure of the output circuit module of a power control system provided in this application;

[0029] Figure 9 A schematic diagram of the circuit structure of a power module for a power control system provided in this application;

[0030] Figure 10 Another structural schematic diagram of a power control system provided in this application;

[0031] Figure 11 A schematic diagram of the circuit structure of a feedback control module for a power control system provided in this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] Active power factor correction module 10, flyback converter module 11, transformer module 12, switch module 13, control module 14, rectifier and filter module 15, output circuit module 16, power supply module 17, feedback control module 18. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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, 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.

[0035] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. 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.

[0036] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0037] Figure 1 A schematic diagram of a power control system provided in this application; such as Figure 1 As shown, the power control system includes an active power factor correction module 10, a flyback converter module 11, a transformer module 12, and a switching module 13, as detailed below:

[0038] In one embodiment, the control output terminal of the flyback converter module 11 is connected to the power input terminal of the transformer module 12 for controlling the input of the transformer module 12; the first voltage output terminal of the transformer module 12 is connected to the power input terminal VCC of the flyback converter module 11 for supplying power to the flyback converter module 11; the second voltage output terminal of the transformer module 12 is connected to the power input terminal VCC of the active power factor correction module 10 through the switch module 13 for selectively supplying power to the active power factor correction module 10 based on the on or off state of the switch module 13.

[0039] In one embodiment, the transformer module 1210 includes an auxiliary winding unit Np_aux, a first rectifier voltage limiting filter unit, and a second rectifier voltage limiting filter unit.

[0040] Specifically, the auxiliary winding unit Np_aux includes a first auxiliary winding and a second auxiliary winding. The first auxiliary winding corresponds to the first rectifier voltage limiting filter unit, and the second auxiliary winding corresponds to the second rectifier voltage limiting filter unit.

[0041] In one embodiment, the transformer module 12 further includes a main winding unit, wherein the main winding unit includes a primary winding Np and a secondary winding, and the secondary winding includes a first primary winding NS1 and a second primary winding NS2.

[0042] Specifically, the primary winding Np is electrically connected to the flyback converter module 11, and the secondary winding is connected to the output circuit module 16 for outputting energy.

[0043] like Figure 2 As shown, Figure 2 A schematic diagram of the circuit structure of a transformer module 12 in a power control system provided in this application.

[0044] Specifically, the first auxiliary winding in the auxiliary winding unit forms a first supply voltage VCC1 through a first rectifier voltage limiting filter unit, and the second auxiliary winding in the auxiliary winding unit forms a second supply voltage VCC2 through a second rectifier voltage limiting filter unit; the first supply voltage VCC1 is used to supply power to the control chip in the flyback converter module 11, and the second supply voltage VCC2 is used to supply power to the control chip in the active power factor correction module 10.

[0045] Specifically, the first rectifier voltage limiting filter unit includes a tenth diode D10, a seventeenth resistor R17, and a sixth electrolytic capacitor EC6. The anode of the tenth diode D10 is electrically connected to the auxiliary winding unit of the transformer module 12, and the cathode of the tenth diode D10 is electrically connected to the positive terminal of the sixth electrolytic capacitor EC6 through the seventeenth resistor R17. The negative terminal of the sixth electrolytic capacitor EC6 is grounded, and the positive terminal of the sixth electrolytic capacitor EC6 is the first voltage output terminal of the transformer module 12, which outputs the first supply voltage VCC1.

[0046] Specifically, the second rectifier voltage limiting filter unit includes a ninth diode D9, a fifteenth resistor R15, and a fifth electrolytic capacitor EC5; the anode of the ninth diode D9 is electrically connected to the auxiliary winding unit of the transformer module 12, the cathode of the ninth diode D9 is electrically connected to the positive terminal of the fifth electrolytic capacitor EC5 through the fifteenth resistor R15, and the negative terminal of the fifth electrolytic capacitor EC5 is grounded; the positive terminal of the fifth electrolytic capacitor EC5 is the second voltage output terminal of the transformer module 12, which outputs the second supply voltage VCC2.

[0047] In one embodiment, the transformer module 12 further includes an eighth capacitor C8, a third Y capacitor CY3, and a fourth Y capacitor CY4; wherein, the first terminal of the eighth capacitor C8 is connected to the positive terminal of the sixth electrolytic capacitor EC6, the first terminal of the fourth Y capacitor CY4 is connected to the second terminal of the eighth capacitor C8 and the negative terminal of the sixth electrolytic capacitor EC6, the second terminal of the fourth Y capacitor CY4 is connected to the first terminal of the third Y capacitor CY3, and the second terminal of the third Y capacitor CY3 is grounded.

[0048] In one embodiment, the transformer module 12 uses independent first auxiliary windings and second auxiliary windings to generate a first supply voltage VCC1 and a second supply voltage VCC2, respectively, to independently power the control chips of the flyback converter module 11 and the active power factor correction module 10. This avoids the problem of power fluctuations interfering with each other that may occur when the two modules share the same power supply. For example, when the flyback converter module 11 performs high-frequency switching operations, it may generate large current changes and voltage ripples. If it shares a power supply with the active power factor correction module 10, these ripples may affect the normal operation of the control chip of the active power factor correction module 10. Independent power supply can effectively isolate this interference, allowing the control chips of both modules to operate under stable voltage.

[0049] In one embodiment, the power control system provided in this application further includes a rectification and filtering module 15.

[0050] In one embodiment, the input terminal of the rectifier-filter module 15 is used to receive AC input signals; the DC bus voltage terminal of the rectifier-filter module 15 is electrically connected to the active power factor correction module 10.

[0051] Specifically, the rectifier and filter module 15 is used to receive AC input signals, filter and rectify the AC input signals, and output a smooth DC bus voltage to provide working power for the subsequent active power factor correction module 10.

[0052] In one embodiment, the rectifier and filter module 15 includes an AC power interface, a fuse F1, a varistor RZ1, a first inductor L1, a first X capacitor CX1, a rectifier bridge BD1, a second capacitor C2, and a third capacitor C3; as shown Figure 3 As shown, Figure 3 A schematic diagram of the circuit structure of a rectifier and filter module 15 of a power control system provided in this application.

[0053] Specifically, pins 1 and 3 of the AC power interface are connected to the phase line ACL and neutral line ACN of the AC power supply, respectively, serving as the interface for the external AC power input circuit. The first end of fuse F1 is connected to the phase line ACL, and the second end of fuse F1 is connected to the first end of varistor RZ1. This allows the fuse to blow and disconnect the circuit in case of an overcurrent fault, protecting downstream components. Varistor RZ1 is connected in parallel between the phase line ACL and the neutral line ACN to suppress instantaneous overvoltage and protect downstream circuits from overvoltage damage. The first X capacitor CX1 is also connected in parallel between the phase line ACL and the neutral line ACN to filter differential-mode interference signals from the power input and improve the electromagnetic compatibility of the power supply. The second pin of the rectifier bridge BD1 is connected to fuse F1. 1. Connected to the phase line ACL, the third pin of the rectifier bridge BD1 is connected to the neutral line ACN to rectify the input AC power into unidirectional pulsating DC power, and output from the first pin and the fourth pin 4 of the rectifier bridge BD1 to the subsequent filter circuit; the first pin of the rectifier bridge BD1 is also connected to the first terminal of the first inductor L1 and the first terminal of the second capacitor C2 respectively, the second terminal of the first inductor L1 is connected to the first terminal of the third capacitor C3, and the fourth pin of the rectifier bridge BD1, the second terminal of the second capacitor C2 and the second terminal of the third capacitor C3 are respectively grounded; wherein, the first inductor L1 is connected in series between the positive terminal of the rectifier bridge output and the subsequent capacitor, and together with the second capacitor C2 and the third capacitor C3, forms a filter network to suppress ripple and interference in the current and output a smooth DC bus voltage.

[0054] In one embodiment, the flyback converter module 11 includes a startup power supply unit, a flyback converter control chip U2, and a third switch Q3.

[0055] Preferably, the flyback converter module 11 is a flyback circuit, whose core function is high-voltage switching power supply control.

[0056] In one embodiment, one end of the startup power supply unit receives an AC input signal, and the other end is connected to the high-voltage pin of the flyback converter control chip U2, for providing high-voltage startup power to the flyback converter control chip U2.

[0057] In one embodiment, the startup power supply unit includes a seventh diode D7, an eighth diode D8, a fourteenth resistor R14, and a sixteenth resistor R16; wherein the cathodes of the seventh diode D7 and the eighth diode D8 are respectively connected to the high-voltage pins of the flyback converter control chip through the fourteenth resistor R14 and the sixteenth resistor R16; the anodes of the seventh diode D7 and the eighth diode D8 are respectively used to receive AC input signals.

[0058] Specifically, the anode of the seventh diode D7 is connected to the neutral line ACN2, and the anode of the eighth diode D8 is connected to the phase line ACL1.

[0059] Specifically, the seventh diode D7 and the eighth diode D8 serve as rectification and clamping devices. When a momentary overvoltage occurs in the AC input voltage, the diodes can limit the peak voltage, preventing excessively high voltage from being directly applied to the high-voltage pin of the flyback converter control chip, thus protecting the control chip from overvoltage damage. The fourteenth resistor R14 and the sixteenth resistor R16 serve as voltage dividers and current limiters. They can divide the AC input voltage, reducing the voltage applied to the high-voltage pin of the flyback converter control chip to a suitable range, while limiting the current flowing into the control chip to prevent excessive current from damaging the chip, ensuring that the control chip can operate under safe and stable voltage and current conditions. This connection method can effectively provide a high-voltage start-up power supply for the flyback converter control chip. After the AC input voltage is rectified by the diodes and the voltage divided and current limited by the resistors, a suitable start-up voltage is provided to the control chip, enabling the control chip to start up smoothly and enter the working state, ensuring the normal operation of the flyback converter module 11.

[0060] In one embodiment, the flyback converter control chip U2 controls the switching of the third switch Q3 by outputting a drive signal, thereby adjusting the input of the transformer module 12.

[0061] Specifically, the control output terminal of the flyback converter module 11 is directly connected to the power input terminal of the primary winding of the transformer module 12, forming a transmission path from the control signal to the input of the primary winding of the transformer. This connection method is different from the conventional power supply link. The purpose is to allow the flyback converter module 11 to directly regulate the current on / off and energy input intensity of the primary winding of the transformer module 12 through the output PWM signal or switch drive signal.

[0062] Preferably, the control output terminal of the flyback converter module 11 is the DRV pin for outputting the drive signal.

[0063] In one embodiment, the third switch is a third MOS transistor, preferably an NMOS transistor; when the third switch is a third MOS transistor and the third MOS transistor is an NMOS transistor, the corresponding first electrode is the gate, the second electrode is the drain, and the third electrode is the source.

[0064] In one embodiment, the control output terminal of the flyback converter control chip U2 is connected to the gate of the third switch Q3. The third switch Q3 is connected in series in the loop between the primary winding of the transformer module 12 and ground. The DC bus voltage output by the rectifier filter module 15 is connected to one end of the primary winding of the transformer module 12.

[0065] In one embodiment, when the flyback converter control chip U2 outputs a high-level drive signal, the third switch Q3 is turned on. At this time, current flows out from the rectifier filter module 15, through the primary winding of the transformer module 12, and through the third switch Q3 to ground. Current flows through the primary winding of the transformer module 12, and electrical energy is stored in the magnetic core of the transformer module 12 in the form of magnetic energy. During this stage, due to the polarity design, the output diode of the secondary winding of the transformer module 12 is cut off, and there is no electrical energy output. The flyback converter control chip U2 determines the total amount of electrical energy injected into the primary side of the transformer in a single operation by controlling the conduction time of the third switch Q3.

[0066] In one embodiment, when the flyback converter control chip U2 outputs a low-level drive signal, the third switch Q3 is turned off; the current loop of the primary winding of the transformer module 12 is interrupted, and the magnetic energy stored in the core generates a reverse electromotive force in the primary winding through electromagnetic induction, while simultaneously inducing a positive voltage in the secondary winding, causing the rectifier diode of the secondary winding to conduct, and the magnetic energy is converted into electrical energy and output through the output circuit module 16; during this stage, there is no new electrical energy input to the primary winding of the transformer module 12, and the flyback converter control chip U2 controls the interval of the electrical energy injection pause in the primary winding by controlling the cutoff time of the third switch Q3.

[0067] In one embodiment, the flyback converter module 11 further includes a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a thirty-seventh resistor R37, a twenty-ninth resistor R29, a twenty-sixth resistor R26, a twelfth diode D12, a thirty-first resistor R31, a forty-first resistor R41, and a forty-second resistor R42; as shown Figure 4 As shown, Figure 4 A schematic diagram of the circuit structure of the flyback converter module 11 of a power control system provided in this application.

[0068] Specifically, the first pin of the flyback converter control chip U2 is connected to the feedback signal terminal V_Sen and the first terminal of the twelfth capacitor C12, respectively, for receiving voltage feedback signals, for internal voltage regulation, and for filtering out ripple and interference from the feedback signal or other nodes based on the twelfth capacitor C12 to ensure signal stability; the second pin of the flyback converter control chip U2 is connected to the output terminal of the feedback control module 18 for receiving feedback signals; and the second pin of the flyback converter control chip U2 is also connected to the first terminal of the thirteenth capacitor C13; the third pin of the flyback converter control chip U2 is connected to the first terminal of the fourteenth capacitor C14; the fourth pin of the flyback converter control chip U2, the second terminal of the twelfth capacitor C12, the second terminal of the thirteenth capacitor C13, and the second terminal of the fourteenth capacitor C14 are all grounded; the fifth pin of the flyback converter control chip U2 is connected to the first terminal of the twenty-ninth resistor R29; the second terminal of the twenty-ninth resistor R29 is connected to the first terminal of the twenty-sixth resistor R26 and the... The cathodes of the twelfth diode D12 are connected together. The second end of the twenty-sixth resistor R26, the anode of the twelfth diode D12, and the first end of the thirty-first resistor R31 are respectively connected to the first terminal of the third switch Q3. The second end of the thirty-first resistor R31 is connected to the first end of the forty-first resistor R41. The third terminal of the third switch Q3 is connected to the first end of the forty-second resistor R42. The second ends of the forty-first resistor R41 and the forty-second resistor R42 are respectively grounded. The first end of the thirty-seventh resistor R37 is connected to the first end of the thirteenth capacitor C13. The second end of the thirteenth capacitor C13 is connected to the first end of the forty-second resistor R42. The second terminal of the third switch Q3 is connected to the third pin of the primary winding Np in the transformer module 12. The sixth pin of the flyback converter control chip U2 is a power supply pin used to connect to the first supply voltage. The eighth pin of the flyback converter control chip U2 is the high-voltage pin of the flyback converter control chip.

[0069] A detailed explanation of the power supply process and power consumption optimization mechanism of the flyback converter control chip U2 in flyback converter module 11:

[0070] In the initial stage of circuit power-on, the AC power supply voltage is input through ACL1 and ACN2; the seventh diode D7 and the eighth diode D8 act as rectifiers, using the unidirectional conductivity of diodes to convert the AC voltage into a unidirectional pulsating DC voltage; the fourteenth resistor R14 and the sixteenth resistor R16 act as voltage dividers and current limiters, reducing the rectified voltage to a range that the flyback converter control chip U2 can withstand, and limiting the current flowing into the flyback converter control chip U2 to prevent excessive current from damaging the chip; that is, through the coordinated work of D7 / D8 / R14 / R16, the initial power required for the start-up of the flyback converter control chip U2 is provided, enabling the flyback converter control chip to start working.

[0071] When the circuit starts up, the transformer module 12 has not yet started working normally and cannot provide a stable power supply through the transformer auxiliary winding. Therefore, it is necessary to obtain energy directly from the AC input side to start the flyback converter control chip U2. Only after the flyback converter control chip U2 starts up and begins to work can the third switch Q3 in the flyback converter circuit 11 be controlled so that the transformer module 12 enters the normal working state.

[0072] After the flyback converter control chip U2 is working normally, it shuts down its internal startup power supply unit. During the startup phase, the flyback converter control chip U2 obtains power from the AC input through D7 / D8 / R14 / R16. This power supply path may have some power loss. For example, resistors fourteen (R14) and sixteen (R16) will consume some power during the voltage division and current limiting process. When the flyback converter control chip U2 is working normally and can obtain power from other more efficient power sources, shutting down the internal startup power supply unit can avoid unnecessary energy consumption and thus reduce the power consumption of the entire circuit.

[0073] After the flyback converter control chip U2 starts working normally, the transformer module 12 begins to operate, and its auxiliary winding unit induces an AC voltage. The tenth diode D10 rectifies the AC voltage induced by the transformer's auxiliary winding, converting it into a unidirectional pulsating DC voltage. Resistor R17 limits the current, preventing excessive current after rectification from impacting subsequent components. Electrolytic capacitor EC6 has a large capacitance, which can filter the rectified voltage, remove voltage ripple, and output a smooth and stable first supply voltage VCC1, providing a continuous and stable power supply for the flyback converter control chip U2.

[0074] In one embodiment, the power control system provided in this application further includes: a control module 14; wherein the control module 14 is electrically connected to the switch module 13, and is used to output a control signal according to the system load state to control the switching module 13 to turn on or off; such as Figure 5As shown, Figure 5 This is another structural schematic diagram of a power control system provided in this application.

[0075] In one embodiment, the control module 14 is an MCU; the MCU is configured to output a first level signal to control the switch module 13 to turn off when the system load state is detected as no system load; the MCU is configured to output a second level signal to control the switch module 13 to turn on when the system load state is detected as having load.

[0076] Specifically, the system being unloaded means that there are no external devices that require power. If the circuit continues to operate at full power at this time, it will generate ineffective power consumption. The system being loaded means that there are external devices that require power. At this time, the circuit needs to output power normally to supply power to the load.

[0077] Preferably, the first level signal is a low level signal and the second level signal is a high level signal.

[0078] In one embodiment, the switching module 13 includes an isolation control unit and a switching transistor; the input terminal of the isolation control unit is connected to the output terminal of the control module 14, and is used to receive the control signal output by the control module 14; the output terminal of the isolation control unit is connected to the control terminal of the switching transistor, and is used to control the switching on and off of the switching transistor; the main circuit of the switching transistor is connected in series between the second voltage output terminal of the transformer module 12 and the power input terminal of the active power factor correction module 10.

[0079] like Figure 6 As shown, Figure 6 This is a schematic diagram of the circuit structure of the control module 14 and the switch module 13 in a power control system provided in this application.

[0080] Specifically, the isolation control unit includes an optocoupler U4, a 23rd resistor R23, and a 24th resistor R24. The optocoupler U4 contains a light-emitting diode and a phototransistor to achieve isolated signal transmission. The input terminals of the optocoupler U4 are the third pin 3 and the fourth pin 4. The fourth pin 4 is connected to the collector of the second transistor Q2 via the 23rd resistor R23, and the third pin 3 is grounded. The output terminals of the optocoupler U4 are the first pin 1 and the second pin 2. The first pin 1 is connected to the VCC2-C pin of the MCU via the 24th resistor R24, and the second pin 2 is grounded.

[0081] Specifically, the switching transistor can be a bipolar transistor or a MOSFET.

[0082] In this embodiment, the switching transistor Q2 is used as an example for specific explanation. The first terminal of the second transistor Q2 is connected to the power input terminal PFC-VCC of the active power factor correction module 10; the second terminal of the second transistor Q2 is connected to the fourth pin 4 of the optocoupler U4 via the twenty-third resistor R23; the third terminal of the second transistor Q2 is connected to the second voltage output terminal of the transformer module 12 for connecting to the second power supply voltage.

[0083] Specifically, the first electrode of the second transistor Q2 is the emitter, the second electrode of the second transistor Q2 is the base, and the third electrode of the second transistor Q2 is the collector.

[0084] In this embodiment, the control module 14 controls the switching module 13 to turn on and off, and thus controls the start and stop of the active power factor correction module 10, by outputting different level signals through the MCU according to whether the system is under load. The process is described in detail below:

[0085] When the system is under load: the MCU detects an external power supply device and outputs a high-level signal from the VCC2-C pin; this signal causes the light-emitting diode inside the optocoupler U4 to conduct and emit light, thereby turning on the phototransistor inside the optocoupler U4; at this time, the base of the second transistor Q2 forms a path to ground through the optocoupler U4, and the base receives a drive current. The collector and emitter of the second transistor Q2 are connected, so that the second supply voltage VCC2 is connected to the power input terminal PFC-VCC of the active power factor correction module 10. At this time, the active power factor correction module 10 receives power, starts up and works normally, providing power factor corrected electrical energy to the load.

[0086] When there is no load on the system: the MCU detects that there is no external power supply and outputs a low-level signal from the VCC2-C pin; the light-emitting diode inside the optocoupler U4 is cut off due to insufficient drive current, and the phototransistor is also cut off; the base of the second transistor Q2 cannot obtain drive current, and the collector and emitter are in the cut-off state. The second power supply voltage VCC2 is disconnected from the power input terminal PFC-VCC of the active power factor correction module 10. The active power factor correction module 10 is not powered and stops working, avoiding the circuit from running at full power and generating invalid power consumption.

[0087] In this embodiment, by combining the power supply voltage generated by the transformer auxiliary winding with the MCU control of the switch on and off, the active power factor correction module 10 is made to work when there is a load and sleep when there is no load, which not only ensures power supply efficiency but also effectively reduces standby power consumption.

[0088] In one embodiment, the active power factor correction module 10 includes an active power factor correction control chip U3; the power input terminal of the active power factor correction control chip is connected to the output terminal of the switching module 13.

[0089] In one embodiment, the active power factor correction module 10 further includes peripheral circuitry; wherein, the peripheral circuitry includes a seventh capacitor C7, an eighteenth resistor R18, a nineteenth resistor R19, a twenty-seventh resistor R27, a thirty-fifth resistor R35, a thirty-fourth resistor R34, a tenth capacitor C10, a fifteenth capacitor C15, a sixteenth capacitor C16, a seventeenth capacitor C17, a thirty-sixth resistor R36, a fortieth resistor R40, a thirty-third resistor R33, a ninth capacitor C9, a twentieth resistor R20, a twenty-first resistor R21, a thirtieth resistor R30, an eleventh diode D11, a first switching transistor 3, and a thirty-eighth resistor R38.

[0090] Preferably, the first switching transistor is a first MOS transistor, and more preferably, the first MOS transistor is an NMOS transistor; when the first switching transistor is a first MOS transistor and the first MOS transistor is an NMOS transistor, the corresponding first electrode is the gate, the second electrode is the drain, and the third electrode is the source.

[0091] like Figure 7 As shown, Figure 7 A schematic diagram of the circuit structure of an active power factor correction module 10 for a power control system provided in this application.

[0092] Specifically, the first pin of the active power factor correction control chip U3 is connected to the feedback signal MP-FB for receiving voltage feedback and realizing closed-loop control of the output voltage. The first pin of the active power factor correction control chip U3 is also grounded through the seventh capacitor C7. The second pin of the active power factor correction control chip U3 is connected to the first terminal of the fifteenth capacitor C15 and the first terminal of the thirty-sixth resistor R36. The second terminal of the thirty-sixth resistor R36 is connected to the first terminal of the sixteenth capacitor C16. The second terminal of the sixteenth capacitor C16 and the fifteenth capacitor... The second terminal of capacitor C15 and the second terminal of the seventeenth capacitor C17 are respectively grounded; the third pin of the active power factor correction control chip U3 is connected to the first terminal of the tenth capacitor C10, the first terminal of the twenty-seventh resistor R27, the first terminal of the thirty-fifth resistor R35, and the first terminal of the thirty-fourth resistor R34, respectively. The second terminals of the thirty-fifth resistor R35, the thirty-fourth resistor R34, and the tenth capacitor C10 are grounded. The second terminal of the twenty-seventh resistor R27 is connected to the first terminal of the nineteenth resistor R19, and the second terminal of the nineteenth resistor R19 is connected to the eighteenth capacitor C10. Resistor R18 is connected. The fourth pin of the active power factor correction control chip U3 is connected to the first terminal of the seventeenth capacitor C17 and the first terminal of the fortieth resistor R40. The fifth pin of the active power factor correction control chip U3 is connected to the thirty-third resistor R33. The sixth pin of the active power factor correction control chip U3 is grounded to the second terminal of the ninth capacitor C9. The first terminal of the ninth capacitor C9 is connected to the eighth pin of the active power factor correction control chip U3. The seventh pin of the active power factor correction control chip U3 is connected to the second... The first ends of the 10th resistor R20 are connected together. The second end of the 20th resistor R20 is connected to the first end of the 21st resistor R21 and the cathode of the 11th diode D11. The second end of the 21st resistor R21, the anode of the 11th diode D11, and the first end of the 30th resistor R30 are connected to the first terminal of the first switch Q1. The second end of the 30th resistor R30 is connected to the second end of the 40th resistor R40. The third terminal of the first switch Q1 is connected to the first end of the 38th resistor R38. The second end of the 38th resistor R38 is grounded.

[0093] In one embodiment, the power control system provided in this application further includes: an output circuit module 16 and a power module 17.

[0094] In one embodiment, the main winding of the transformer module 12 is electrically connected to the input terminal of the power supply module 17 through the output circuit module 16, and the output terminal of the power supply module 17 is connected to the power input terminal of the control module 14 to convert the voltage output by the main winding into a 5V DC voltage to power the control module 14.

[0095] Specifically, the power module 17 converts the voltage output from the transformer main winding into a stable 5V DC voltage. This is because the voltage output from the transformer main winding may be unstable due to factors such as load changes and input voltage fluctuations. The power module 17 usually has a voltage regulator circuit inside, which can regulate and stabilize the input voltage to provide a stable power supply for the control module 14, ensuring that the control module 14 can work normally under various operating conditions.

[0096] In one embodiment, the output circuit module 16 includes a first resistor R1, a first capacitor C1, a third parallel diode D3, a third electrolytic capacitor EC3, a second electrolytic capacitor EC2, and a sixth resistor R6.

[0097] like Figure 8 As shown, Figure 8 A schematic diagram of the circuit structure of the output circuit module 16 of a power control system provided in this application.

[0098] Specifically, in transformer module 12, the twelfth pin of the secondary side NS2 of the second main winding is connected to the anode of the third parallel diode D3 and the first end of the first resistor R1. The second end of the first resistor R1 is connected to the first end of the first capacitor C1. The second end of the first capacitor C1, the cathode of the third parallel diode D3, the positive terminal of the third electrolytic capacitor EC3, the positive terminal of the second electrolytic capacitor EC2, and the first end of the sixth resistor R6 are connected to the voltage output terminal of the output circuit package. The negative terminals of the third electrolytic capacitor EC3, the negative terminals of the second electrolytic capacitor EC2, and the second end of the sixth resistor R6 are grounded. The rectification effect of the third parallel diode D3 converts the AC voltage output from the secondary side NS2 of the second main winding into unidirectional pulsating DC voltage. Combined with the DC blocking effect of the first capacitor C1 and the filtering effect of the second and third electrolytic capacitors EC2 and EC3, a stable 24V DC voltage is finally output to meet the power supply requirements of the subsequent circuits, such as power module 17.

[0099] like Figure 9 As shown, Figure 9 A schematic diagram of the circuit structure of a power module 17 of a power control system provided in this application.

[0100] In one embodiment, the power module 17 includes a DC-DC converter chip U1, a fifth capacitor C5, a second inductor L2, a fourth diode D4, a fourth electrolytic capacitor EC4, and a sixth capacitor C6.

[0101] Specifically, the VIN pin of the DC-DC converter chip U1 is used to connect to the 24V voltage output by the output circuit module 16. The VOUT pin of the DC-DC converter chip U1 outputs a 5V voltage filtered by the second inductor L2, the fourth electrolytic capacitor EC4, and the sixth capacitor C6. The FB pin of the DC-DC converter chip U1 is used for internal voltage feedback regulation. The EN pin of the DC-DC converter chip U1 can be connected to an external control signal. The fifth capacitor C5 is connected in parallel between the 24V input and ground for input filtering to remove ripple interference from the input voltage.

[0102] In one embodiment, the power module 17 efficiently converts the 24V input into a stable 5V DC voltage to meet the control module 14's requirements for low voltage and high-precision power supply, ensuring stable operation of the control circuit.

[0103] In one embodiment, the power control system provided in this application further includes: a feedback control module 18; such as Figure 10 As shown, Figure 10 This is another structural schematic diagram of a power control system provided in this application.

[0104] The main winding of the transformer module 12 is electrically connected to the input terminal of the feedback control module 18 through the output circuit module 16. The output terminal of the feedback control module 18 is connected to the feedback terminal of the flyback converter module 11, and is used to adjust the output of the flyback converter module 11 according to the output voltage and / or current of the load.

[0105] In one embodiment, the feedback control module 18 includes an optocoupler isolation unit and a sampling circuit; the sampling circuit is used to collect the output voltage and / or current of the system; the optocoupler isolation unit is used to isolate and transmit the sampled signal collected by the sampling circuit to the feedback terminal of the flyback converter module 11.

[0106] Specifically, the feedback control module 18 collects the voltage and / or current signals of the transformer main winding through the output circuit module 16, and then transmits these signals to the feedback terminal of the flyback converter module 11. At this time, the flyback converter module 11 will adjust its own operating parameters in real time according to the feedback signal.

[0107] like Figure 11 As shown, Figure 11 A schematic diagram of the circuit structure of the feedback control module 18 of a power control system provided in this application.

[0108] In one embodiment, the sampling circuit includes a 25th resistor R25, a 28th resistor R28, a 39th resistor R39, a 43rd resistor R43, an 11th capacitor C11, a 6th diode D6, a 22nd resistor R22, and a 32nd resistor R32, and the optocoupler isolation unit is an optocoupler U5.

[0109] Specifically, the input terminal of the sampling circuit is used to connect the 24V voltage output by the output circuit module 16. The first terminal of the twenty-second resistor R22 and the first terminal of the twenty-fifth resistor R25 are respectively connected to the input terminal of the sampling circuit. The second terminal of the twenty-fifth resistor R25 is connected to the first pin of the optocoupler U5. The first terminal of the twenty-eighth resistor R28 is connected to the first pin of the optocoupler U5. The second pin of the optocoupler U5 is connected to the second terminal of the twenty-eighth resistor R28, the first terminal of the thirty-ninth resistor R39, and the cathode of the sixth diode D6. The second end of resistor R39 is connected to the first end of capacitor C11. The second end of capacitor C11 is connected to the first end of resistor R43 and resistor R32. The first end of resistor R32 is connected to the second end of resistor R22. The anode of diode D6 and the second end of resistor R43 are grounded. The fourth pin of optocoupler U5 is connected to the feedback terminal FB of flyback converter chip U2 in flyback converter module 11. The third pin of optocoupler U5 is grounded.

[0110] This application also provides a clothes drying rack, including the power control system provided in any of the foregoing embodiments.

[0111] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0112] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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.

[0113] Furthermore, 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0114] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0115] 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.

[0116] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0117] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Since these modifications and variations fall within the scope of the claims and their equivalents, this application also intends to include these modifications and variations.

[0118] The above description describes specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered 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 control system, characterized in that, include: Active power factor correction module, flyback converter module, transformer module and switching module; The control output terminal of the flyback converter module is connected to the power input terminal of the transformer module, and is used to control the input of the transformer module; The first voltage output terminal of the transformer module is connected to the power input terminal of the flyback converter module to supply power to the flyback converter module. The second voltage output terminal of the transformer module is connected to the power input terminal of the active power factor correction module through the switch module, and is used to selectively supply power to the active power factor correction module based on the on or off state of the switch module.

2. The power control system as described in claim 1, characterized in that, Also includes: Control module; The control module is electrically connected to the switch module and is used to output control signals according to the system load status to control the switch module to turn on or off. The control module is configured to output a first-level signal to control the switch module to turn off when the system load state is detected to be no load. The control module is configured to output a second-level signal to control the switch module to turn on when the system load status is detected to be that the system is under load.

3. The power control system as described in claim 2, characterized in that, The switching module includes an isolation control unit and a switching transistor; The input terminal of the isolation control unit is connected to the output terminal of the control module, and is used to receive the control signal output by the control module; The output terminal of the isolation control unit is connected to the control terminal of the switching transistor, and is used to control the switching transistor's on / off state. The main circuit of the switching transistor is connected in series between the second voltage output terminal of the transformer module and the power input terminal of the active power factor correction module.

4. The power control system as described in claim 2, characterized in that, The transformer module includes an auxiliary winding unit, a first rectifier voltage limiting filter unit, and a second rectifier voltage limiting filter unit. The auxiliary winding unit generates a first power supply voltage through a first rectifier voltage limiting filter unit, and the auxiliary winding unit generates a second power supply voltage through a second rectifier voltage limiting filter unit. The first supply voltage is used to power the control chip in the flyback converter module, and the second supply voltage is used to power the control chip in the active power factor correction module.

5. The power control system as described in claim 4, characterized in that, The first rectifier voltage limiting filter unit includes a tenth diode, a seventeenth resistor, and a sixth electrolytic capacitor. The anode of the tenth diode is electrically connected to the auxiliary winding unit of the transformer module, the cathode of the tenth diode is electrically connected to the positive terminal of the sixth electrolytic capacitor through the seventeenth resistor, the negative terminal of the sixth electrolytic capacitor is grounded, and the positive terminal of the sixth electrolytic capacitor outputs the first supply voltage. The second rectifier voltage limiting filter unit includes a ninth diode, a fifteenth resistor, and a fifth electrolytic capacitor; the anode of the ninth diode is electrically connected to the auxiliary winding unit of the transformer module, the cathode of the ninth diode is electrically connected to the positive terminal of the fifth electrolytic capacitor through the fifteenth resistor, and the negative terminal of the fifth electrolytic capacitor is grounded; the positive terminal of the fifth electrolytic capacitor outputs a second supply voltage.

6. The power control system as described in claim 1, characterized in that, Also includes: Rectifier and filter module; The input terminal of the rectifier and filter module is used to receive AC input signals; The DC bus voltage terminal of the rectifier filter module is electrically connected to the active power factor correction module.

7. The power control system as described in claim 6, characterized in that, The flyback converter module includes a startup power supply unit, a flyback converter control chip, and a third switching transistor; One end of the startup power supply unit receives an AC input signal, and the other end is connected to the high-voltage pin of the flyback converter control chip to provide a high-voltage startup power supply for the flyback converter control chip. The flyback converter control chip controls the switching on and off of the third switching transistor by outputting a drive signal, which is used to adjust the input of the transformer module.

8. The power control system as described in claim 4, characterized in that, Also includes: Output circuit module and power supply module; The transformer module also includes a main winding; The main winding of the transformer module is electrically connected to the input terminal of the power supply module through the output circuit module. The output terminal of the power supply module is connected to the power input terminal of the control module to convert the voltage output by the main winding into DC voltage to power the control module.

9. The power control system as described in claim 8, characterized in that, Also includes: Feedback control module; The main winding of the transformer module is electrically connected to the input terminal of the feedback control module through the output circuit module, and the output terminal of the feedback control module is connected to the feedback terminal of the flyback converter module, which is used to adjust the output of the flyback converter module according to the output voltage and / or current of the load. The feedback control module includes an optocoupler isolation unit and a sampling circuit. The sampling circuit is used to acquire the system's output voltage and / or current; The optocoupler isolation unit is used to isolate and transmit the sampled signal acquired by the sampling circuit to the feedback terminal of the flyback converter module.

10. A clothes drying rack, characterized in that, Including the power control system as described in any one of claims 1-9.

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