Power supply device with zero power consumption standby function

Abstract

A power supply device with a zero power consumption standby function is characterized in that a power supply circuit comprises an alternating current power supply, an AC-DC conversion unit, a primary side control circuit, a first power supply interface, a second power supply interface and a secondary side control circuit, when the secondary side control circuit judges that a load is not coupled to the first power supply interface and / or the second power supply interface, the secondary side circuit adjusts the feedback signal to be in a preset state, and the primary side control circuit enters a hiccup mode after receiving the feedback signal. According to the embodiment of the utility model, by detecting whether the load is coupled to the first power supply interface and / or the second power supply interface, when the load is not coupled to the power supply interface, the secondary side control circuit adjusts the feedback signal to the preset state, and the primary side control circuit is promoted to enter the hiccup mode, so that the conduction time of the power switch is reduced, and the overall power consumption of the system is reduced.

Description

Technical Field

[0001] This utility model relates to the field of PD charging technology, specifically to a power supply device with zero power consumption standby function. Background Technology

[0002] With the widespread adoption of Type-C ports, power supply devices supporting the USB-Power Delivery protocol are gradually becoming mainstream. Compared to traditional USB charging protocols, the PD protocol allows for higher power transfer, supports multiple voltage levels, and can identify devices and intelligently adjust power supply through the CC signal port. Therefore, PD chargers are widely used in smartphones, tablets, laptops, smart home devices, and other fields.

[0003] Driven by energy conservation and emission reduction policies, countries have put forward stricter requirements for the standby power consumption of power adapters. For example, the EU COC-V5 Tier2 stipulates that in applications with power of 45W and below, the standby power consumption must be less than 30mW. However, in the existing technology, PD chargers require communication and regulation by a secondary-side PD controller, making it extremely challenging to further reduce standby power consumption. Therefore, how to achieve an ultra-low standby power consumption solution that is compatible with the PD protocol in PD chargers has become an urgent problem to be solved. Utility Model Content

[0004] In order to solve the above-mentioned problems in the prior art, the purpose of this utility model is to provide a power supply device and its electronic equipment with zero power consumption standby function, which overcomes the technical bottleneck that the power consumption of the power adapter in the standby mode is difficult to reduce in the prior art.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A power supply device with zero-power standby function, comprising:

[0007] AC power supply, used to provide alternating current;

[0008] AC-DC conversion unit, connected to the AC power supply, is used to convert the AC power into DC power;

[0009] The primary-side control circuit, connected to the AC-DC conversion unit, is used to output a switching signal based on the feedback signal.

[0010] The first power supply interface and the second power supply interface are used to connect the load;

[0011] The secondary-side control circuit is coupled to the first power supply interface and the second power supply interface, and communicates with the load via CC through the first power supply interface and / or the second power supply interface, and generates a feedback signal to the primary-side circuit.

[0012] When the secondary-side control circuit determines that the load is not coupled to the first power supply interface and / or the second power supply interface, the secondary-side circuit adjusts the feedback signal to a preset state, and the primary-side control circuit enters the hiccup mode after receiving the feedback signal.

[0013] Furthermore, it also includes a transformer and a synchronous rectification unit. The transformer includes a primary winding, a secondary winding, and an auxiliary winding. The primary winding is connected between the primary control circuit and the AC-DC conversion unit. The secondary winding is connected between the secondary control circuit and the synchronous rectification unit. The auxiliary winding is connected to the power supply terminal of the primary control circuit.

[0014] Furthermore, the secondary-side control circuit includes a feedback unit, a BUCK-BOOST unit, a primary-side control unit, and a secondary-side control unit, wherein:

[0015] The power supply terminal of the BUCK-BOOST unit is connected to the voltage output terminal of the synchronous rectification unit, and the voltage output terminal of the BUCK-BOOST unit is connected to the secondary stage control unit.

[0016] The voltage output terminal of the synchronous rectification unit is connected to the power supply terminal of the primary stage control unit;

[0017] The optocoupler control terminal of the primary side control unit is connected to the feedback signal receiving terminal of the primary side control circuit through the feedback unit;

[0018] The first-stage side control unit is connected to the first power supply interface; the second-stage side control unit is connected to the second power supply interface.

[0019] Furthermore, the first-stage side control unit includes a first-stage side controller and a first switching transistor, and the second-stage side control unit includes a second-stage side controller and a second switching transistor, wherein:

[0020] The first terminal of the first switching transistor is connected to the voltage output terminal of the synchronous rectification unit, the second terminal of the first switching transistor is connected to the switching drive terminal of the primary side controller, and the third terminal of the first switching transistor is connected to the VBUS pin of the first power supply interface and the power supply detection terminal of the primary side controller.

[0021] The first end of the second switching transistor is connected to the voltage output terminal of the BUCK-BOOST unit, the second end of the second switching transistor is connected to the switching drive terminal of the secondary side controller, and the third end of the second switching transistor is connected to the VBUS pin of the second power supply interface and the power supply detection terminal of the secondary side controller.

[0022] The CC communication terminal of the first-stage controller is connected to the CC pin of the first power supply interface, and the CC communication terminal of the second-stage controller is connected to the CC pin of the second power supply interface.

[0023] Furthermore, the primary-side control circuit includes a primary-side controller, a third switching transistor, a fourth switching transistor, and a first capacitor, wherein:

[0024] The feedback input terminal of the primary-side controller is connected to the second terminal of the fourth switching transistor. The first terminal of the fourth switching transistor is connected to the voltage output terminal of the AC-DC conversion unit. The third terminal of the fourth switching transistor is connected to the power supply terminal of the primary-side controller and the auxiliary winding. The first terminal of the third switching transistor is connected to the primary-side winding. The second terminal of the third switching transistor is connected to the external drive terminal of the primary-side controller. The third terminal of the third switching transistor is grounded. The first capacitor is connected in parallel to the first and third terminals of the third switching transistor.

[0025] Furthermore, it also includes an auxiliary power supply unit, which includes a first diode, a second diode, a third diode, a Zener diode, a fifth switching transistor, a first resistor, a second resistor, a third resistor, a second capacitor, and a third capacitor. The auxiliary winding is provided with a connection point, which is connected to the anode of the first diode, the third terminal of the fifth switching transistor, the third terminal of the fourth switching transistor, and the power supply terminal of the primary-side controller through the third diode and the third resistor. The first terminal of the fifth switching transistor is connected to the cathode of the first diode, one end of the first resistor, one end of the second resistor, one end of the second capacitor, and one end of the third capacitor. The second terminal of the fifth switching transistor is connected to the other end of the first resistor and the cathode of the Zener diode. The other end of the second resistor is connected to the cathode of the second diode. The anode of the second diode is connected to the first terminal of the auxiliary winding. The second terminal of the auxiliary winding is connected to the anode of the Zener diode, the voltage detection terminal of the primary-side controller, the other end of the second capacitor, and the other end of the third capacitor.

[0026] Furthermore, the primary-side control circuit also includes an overvoltage protection unit composed of a fourth resistor, a fifth resistor, and a sixth resistor. One end of the overvoltage protection unit is grounded, and the other end is connected to the voltage detection terminal of the primary-side controller.

[0027] Furthermore, the first-level side control unit also includes a sixth switch transistor. The first end of the sixth switch transistor is connected between the CC communication terminal of the first-level side controller and the CC pin of the first power supply interface. The second end of the sixth switch transistor is connected to the E-MARK detection port of the first-level side controller. The third end of the sixth switch transistor is connected between the CC communication terminal of the second-level side controller and the CC pin of the second power supply interface.

[0028] Furthermore, it also includes a fourth diode and a fifth diode, and the fast charging protocol terminal of the first-stage controller is connected between the CC communication terminal of the second-stage controller and the CC pin of the second power supply interface through the fourth diode and the fifth diode.

[0029] Furthermore, the power balancing terminal of the first-stage side controller is connected to the power balancing terminal of the second-stage side controller.

[0030] This utility model embodiment detects whether the load is coupled to the first power supply interface and / or the second power supply interface. When the load is not coupled to the power supply interface, the secondary side control circuit adjusts the feedback signal to a preset state, causing the primary side control circuit to enter the hiccup mode, thereby reducing the conduction time of the power switch and reducing the overall power consumption of the system. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a pin diagram of the first power supply interface and / or the second power supply interface of this utility model;

[0033] Figure 2 This is a schematic diagram of a power supply device with zero-power standby function according to this utility model;

[0034] Figure 3 This is a partial circuit schematic diagram of an embodiment of this utility model;

[0035] Figure 4 This is a circuit schematic diagram of another part of an embodiment of this utility model.

[0036] Figure label:

[0037] 100. AC power supply;

[0038] 200. AC-DC conversion unit;

[0039] 300. Primary-side control circuit; 310. Primary-side controller; Q1. Third switch; Q2. Fourth switch; C1. First capacitor; 320. Feedback unit; 330. BUCK-BOOST unit; 340. Overvoltage protection unit; R1. Fourth resistor; R2. Fifth resistor; R5. Sixth resistor;

[0040] 400, Secondary-side control circuit; 410, Primary-side control unit; 411, Primary-side controller; Q5, First switching transistor; Q6, Sixth switching transistor; D7, Fourth diode; D8, Fifth diode; 420, Secondary-side control unit; 421, Secondary-side controller; Q9, Second switching transistor;

[0041] 500, First power supply interface;

[0042] 600. Second power supply interface;

[0043] 700. Transformer; 710. Primary winding; 720. Secondary winding; 730. Auxiliary winding;

[0044] 800, Synchronous Rectifier Unit;

[0045] 900, Auxiliary power supply unit; D2, First diode; D3, Second diode; D11, Third diode; ZD1, Zener diode; Q3, Fifth switching transistor; R18, First resistor; R21, Second resistor; R7, Third resistor; C2, Second capacitor; C4, Third capacitor. Detailed Implementation

[0046] The present invention will be further described in detail below with reference to the accompanying drawings.

[0047] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive element, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0049] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0050] Reference Figure 2 This utility model embodiment provides a power supply device with zero-power standby function, including:

[0051] AC power supply 100, used to provide AC power;

[0052] The AC-DC conversion unit 200 is connected to the AC power supply 100 and is used to convert the input AC power into DC power and provide a stable DC power supply to other circuits in the system. The AC-DC conversion unit includes an inductor L1, a fuse F1, a rectifier bridge BD1, energy storage capacitors EC1, EC2, EC3, and EC4, and current-limiting resistors R24 and R25. The AC power supply undergoes preliminary current protection and EMI filtering through the inductor L1 and fuse F1. The rectifier bridge BD1 converts the input AC power into pulsating DC power. The energy storage capacitors EC1, EC2, EC3, and EC4 are used to smooth the rectified DC voltage and provide necessary energy storage. The current-limiting resistors R24 and R25 are used to prevent overcurrent damage.

[0053] The primary-side control circuit 300 is connected to the AC-DC conversion unit 200 and is used to output a switching signal according to the feedback signal. The converted DC power is regulated by the primary-side control circuit 300 to adjust the output voltage and current.

[0054] The first power supply interface 500 and the second power supply interface 600 are used to provide power to the load and support communication through the first power supply interface 500 and the second power supply interface 600.

[0055] The secondary-side control circuit 400 is coupled to the first power supply interface 500 and the second power supply interface 600, and communicates with the load via CC communication through the first power supply interface 500 and / or the second power supply interface 600. It also detects the connection status of the load via CC (Configuration Channel) communication and generates a feedback signal to the primary-side circuit.

[0056] The key aspect of this embodiment is that when the secondary-side control circuit 400 detects that the load is not connected to the first power supply interface 500 and / or the second power supply interface 600, the secondary-side control circuit 400 adjusts the feedback signal to a preset state. Upon receiving this feedback signal, the primary-side control circuit 300 triggers a hiccup mode: the hiccup mode is an intermittent operating mode, meaning the primary-side circuit periodically starts and stops, rather than continuously outputting power. The advantages of the hiccup mode are that when the load is not connected, the conversion system can reduce power consumption, minimize energy waste, and prevent the circuit from operating abnormally under no-load conditions. Furthermore, the hiccup mode can avoid circuit damage that may result from prolonged high-voltage no-load operation, extending the system's lifespan.

[0057] It should be noted that when the secondary-side control circuit 400 detects that the load is not connected, it will adjust the feedback signal to a preset state to control the primary-side circuit to enter a specific operating mode. There are three preset states. In the above embodiment, the preset state is a low-power standby mode, that is, the feedback signal is set to make the primary side enter a hiccup mode, thereby intermittently starting and stopping the power supply to reduce overall power consumption. Please refer to the following text for the other two preset states.

[0058] Reference Figure 3-4 Furthermore, the transformer 700 includes a primary winding 710, a secondary winding 720, and an auxiliary winding 730, used to convert the DC power provided by the AC-DC conversion unit into an output voltage suitable for the load requirements: the primary winding 710 is connected between the AC-DC conversion unit 200 and the primary control circuit 300, responsible for converting the pulse signal controlled by the primary controller 310 into a magnetic field, and transferring energy to the secondary side through the coupling of the transformer 700; the secondary winding 720 is connected to the secondary control circuit 400 and the synchronous rectification unit 800, and when the magnetic field of the primary winding 710 changes, the secondary winding 720 realizes the transfer of electrical energy through induced voltage; the auxiliary winding 730 is connected to the power supply terminal of the primary control circuit 300, and is usually used to provide the working power of the primary controller 310. Through electromagnetic coupling with the primary winding 710, it supplies power to the control circuit when the transformer 700 is working, reducing the demand for external power and improving energy efficiency.

[0059] Furthermore, the synchronous rectification unit 800 includes a synchronous rectification controller U2 and a switching transistor Q4. In this embodiment, the synchronous rectification controller U2 can be an iW610 or other chips with similar functions. The switching transistor Q4 is a multi-pin MOSFET or other MOSFETs with similar functions. The iW610 has the ability to intelligently detect and precisely drive MOSFETs, which can significantly reduce conduction losses and improve conversion efficiency. At the same time, the iW610 supports high-frequency operation, optimizes dynamic response, and has comprehensive overcurrent and overtemperature protection, improving system reliability and safety. The multi-pin MOSFET has lower on-resistance and better heat dissipation performance, which can reduce power loss and improve current carrying capacity.

[0060] In one embodiment, reference is made to... Figure 3-4 The primary-side control circuit 300 includes a primary-side controller 310, a third switch Q1, a fourth switch Q2, and a first capacitor C1. The feedback input terminal of the primary-side controller 310 is connected to the second terminal of the fourth switch Q2. The first terminal of the fourth switch Q2 is connected to the voltage output terminal of the AC-DC conversion unit 200. The third terminal of the fourth switch Q2 is connected to the power supply terminal of the primary-side controller 310 and the auxiliary winding 730. The first terminal of the third switch Q1 is connected to the primary-side winding 710. The second terminal of the third switch Q1 is connected to the external drive terminal of the primary-side controller 310. The third terminal of the third switch Q1 is grounded. The first capacitor C1 is connected in parallel to the first and third terminals of the third switch Q1.

[0061] During operation, the feedback input terminal of the primary-side controller 310 is connected to the second terminal of the fourth switch Q2 to receive the feedback signal from the secondary side, thereby adjusting the switching drive signal and regulating the output voltage and current. The first terminal of the fourth switch Q2 is connected to the voltage output terminal of the AC-DC conversion unit 200, and the third terminal is connected to the power supply terminal of the primary-side controller 310 and the auxiliary winding 730. When the load demand changes or the secondary-side control circuit 400 adjusts the feedback signal, the primary-side controller 310 will optimize the power supply strategy by controlling the state of the fourth switch Q2. The first terminal of the third switch Q1 is connected to the primary-side winding 710, the second terminal is connected to the external drive terminal of the primary-side controller 310, and the third terminal is grounded. The third switch Q1 is driven by the primary-side controller 310 to control the on / off state of the primary-side winding 710. Its switching state determines the accumulation and release process of magnetic energy, thereby affecting the output voltage of the secondary winding 720 and the auxiliary winding 730. The first capacitor C1 is connected in parallel to the first and third terminals of the third switch Q1. The first capacitor C1 is a gallium nitride device with a capacitance of 10nF. The main function of the first capacitor C1 is to store and release energy during the switching process of the switch, thereby effectively driving the third switch Q1 and optimizing the power consumption management of the system. When the system enters hiccup mode, the first capacitor C1 maintains a specific voltage level with the help of the third switch Q1, so that the primary side control circuit 300 maintains stable operation during intermittent start-up and shutdown, while reducing the overall power consumption. Under low load or no load conditions, the energy storage characteristics of the first capacitor C1 can assist the third switch Q1 to enter a low power consumption state, reduce unnecessary energy loss, ensure that the power consumption of the system in standby mode is minimized, and improve conversion efficiency and energy saving effect.

[0062] In this embodiment, the primary-side controller 310U1 can be an iW9860 or other chips with similar functions. The iW9860 uses the feedback input terminal FB / ASU for multi-mode control and combines the current detection terminal CS for current sampling to optimize the quasi-resonant switching mode, reduce switching losses, and improve energy efficiency. At the same time, the iW9860 supports intelligent management of the power supply terminal VCC, which can reduce standby power consumption to below 5mW under low load or no load conditions, meeting the requirements of high efficiency and energy saving.

[0063] Furthermore, refer to Figure 3-4 The secondary-side control circuit 400 includes a feedback unit 320, a BUCK-BOOST unit 330, a primary-side control unit 410, and a secondary-side control unit 420, wherein:

[0064] The power supply terminal of the BUCK-BOOST unit 330 is connected to the voltage output terminal of the synchronous rectification unit 800. The voltage output terminal of the BUCK-BOOST unit 330 is connected to the secondary stage-side control unit 420. The voltage output terminal of the synchronous rectification unit 800 is connected to the power supply terminal of the primary stage-side control unit 410. The optocoupler control terminal of the primary stage-side control unit 410 is connected to the feedback signal receiving terminal of the primary-side control circuit 300 through the feedback unit 320. The primary stage-side control unit 410 is connected to the first power supply interface 500. The secondary stage-side control unit 420 is connected to the second power supply interface 600. The voltage output terminal of the step rectifier unit 800 provides input voltage to the BUCK-BOOST unit 330 and also directly powers the first-stage side control unit 410. The BUCK-BOOST unit 330 further performs step-up and step-down conversion on the voltage to adapt it to different load requirements, and sends the converted stable voltage to the second-stage side control unit 420, providing it with an independent power supply path. The first-stage side control unit 410 directly obtains power from the synchronous rectifier unit 800 and provides voltage output to the first power supply interface 500, while the second-stage side control unit 420 provides voltage output to the second power supply interface 600 through the voltage processed by BUCK-BOOST.

[0065] The primary side control unit 410 performs feedback control through an optocoupler. Its optocoupler control terminal is connected to the feedback unit 320 and ultimately provides an adjustment signal to the feedback signal receiving terminal FB of the primary side control circuit 300, so that the primary side adjusts the output power to ensure that the system maintains a stable voltage and current.

[0066] Furthermore, refer to Figure 3-4 The first-stage side control unit 410 includes a first-stage side controller 411 and a first switching transistor Q5, and the second-stage side control unit 420 includes a second-stage side controller 421 and a second switching transistor Q9, wherein:

[0067] The first terminal of the first switching transistor Q5 is connected to the voltage output terminal of the synchronous rectification unit 800, the second terminal of the first switching transistor Q5 is connected to the switching drive terminal of the first primary side controller 411, and the third terminal of the first switching transistor Q5 is connected to the VBUS pin of the first power supply interface 500 and the power supply detection terminal of the first primary side controller 411.

[0068] The first end of the second switch Q9 is connected to the voltage output terminal of the BUCK-BOOST unit 330, the second end of the second switch Q9 is connected to the switch drive terminal of the secondary stage controller 421, and the third end of the second switch Q9 is connected to the VBUS pin of the second power supply interface 600 and the power supply detection terminal of the secondary stage controller 421.

[0069] The CC communication terminal of the first-stage controller 411 is connected to the CC pin of the first power supply interface 500, and the CC communication terminal of the second-stage controller 421 is connected to the CC pin of the second power supply interface 600.

[0070] It should be noted that the first power supply interface 500 and / or the second power supply interface 600 can be a USB-C interface, or other interfaces with similar functions, see reference. Figure 1 In this embodiment, taking the USB-C interface as an example, the female connector pinout of the USB-C interface includes two rows of symmetrical pins, labeled as group A (A1-A12) and group B (B1-B12), respectively. The pins and functions related to this utility model are described as follows:

[0071] CC1 (pin A5) and CC2 (pin B5) are important pins in the USB-C interface used for power delivery negotiation (USB Power Delivery, PD) and fast charging protocol identification. The secondary-side control circuit 400 of this invention is connected to these two pins respectively to realize the switching and transmission of CC signals.

[0072] VBUS (A4, A9, B4, B9 pins) are power supply pins that provide a voltage output from 5V to 20V to power connected devices.

[0073] In this embodiment, the primary-side controller 411 and / or the secondary-side controller 421 can be an iW780, or other chips with similar functions. The iW780 uses the optocoupler control terminal OPTO for feedback control and combines the current detection terminals IS+ and IS- for load current monitoring to optimize synchronous rectification control, improve conversion efficiency, and ensure stable output voltage and current. At the same time, the iW780 supports intelligent management of the power supply terminal VDD, which can adjust the feedback signal under low load or no load conditions, enabling the primary side to enter a low-power mode and reducing standby power consumption to below 5mW, meeting the requirements of high efficiency and energy saving.

[0074] Furthermore, refer to Figure 3-4The first-level side control unit 410 further includes a sixth switch Q6. The first end of the sixth switch Q6 is connected between the CC communication terminal of the first-level side controller 411 and the CC pin of the first power supply interface 500. The second end of the sixth switch Q6 is connected to the E-MARK detection port of the first-level side controller 411. The third end of the sixth switch Q6 is connected between the CC communication terminal of the second-level side controller 421 and the CC pin of the second power supply interface 600. In this embodiment, the sixth switch Q6 is used for CC signal switching and E-MARK identification to achieve intelligent control and protocol compatibility between ports.

[0075] Furthermore, refer to Figure 3-4 It also includes a fourth diode D7 and a fifth diode D8. The fast charging protocol terminal of the first-stage controller 411 is connected between the CC communication terminal of the second-stage controller 421 and the CC pin of the second power supply interface 600 through the fourth diode D7 and the fifth diode D8. In this embodiment, the fourth diode D7 and the fifth diode D8 are used to realize the linkage control of the first-stage controller 411, the second-stage controller 421 and CC communication. Pin 6 of the first-stage controller 411 provides a 3.2V reference voltage to the CC1 and CC2 pins of the second-stage controller 421 through the fourth diode D7 and the fifth diode D8. In hiccup mode, the first Pin 12 of the secondary-side controller 411 pulls pin 12 of the secondary-side controller 421, simultaneously disabling the BUCK-BOOST circuit. This puts the secondary-side controller 421 and BUCK-BOOST into a low-power standby state, during which pin 6 of the secondary-side controller 421 is inactive. When a device with an RD resistor is connected to the second power supply interface 600, the 3.2V reference voltage on pins CC1 and CC2 of the secondary-side controller 421 is pulled low. Upon detecting this voltage change, the primary-side controller 411 releases the low-level limit on pin 12, thereby enabling the secondary-side controller 421 and BUCK-BOOST circuit to enter normal operating mode. Simultaneously, the primary-side controller 411 feeds back the state change to the primary-side controller 310 via an optocoupler, notifying the system to enter normal charging mode, thus achieving intelligent port management, low-power standby optimization, and rapid response.

[0076] Furthermore, refer to Figure 3-4The power balancing terminal of the first-stage side controller 411 is connected to the power balancing terminal of the second-stage side controller 421. In this embodiment, power distribution and temperature management are achieved through the connection between the power balancing terminals of the first-stage side controller 411 and the second-stage side controller 421. When the first power supply interface 500 or the second power supply interface 600 works independently, the system can provide a maximum power output of 67W to meet the charging needs of high-power devices. When both power supply interfaces are used simultaneously, the power is dynamically adjusted through the power balancing terminal, distributing 45-50W and 15-20W respectively, with the total power limited to 65W to ensure overall load balance. Pin 11 of the power balancing terminal is used for real-time communication between the two controllers. When simultaneous operation of both ports is detected, the system transmits signals to each other through this port to reduce the PWM duty cycle, adjust the power output, and prevent local overheating.

[0077] Furthermore, refer to Figure 3-4 It also includes an auxiliary power supply unit 900, which includes a first diode D2, a second diode D3, a third diode D11, a Zener diode ZD1, a fifth switch Q3, a first resistor R18, a second resistor R21, a third resistor R7, a second capacitor C2, and a third capacitor C4. The auxiliary winding 730 has a connection point, which is connected to the anode of the first diode D2, the third terminal of the fifth switch Q3, the third terminal of the fourth switch Q2, and the power supply terminal of the primary-side controller 310 via the third diode D11, the third resistor R7, and the third terminal of the first switch D2. The first terminal of the fifth switch Q3 is connected to... The cathode of the first diode D2, one end of the first resistor R18, one end of the second resistor R21, one end of the second capacitor C2, and one end of the third capacitor C4 are connected. The second end of the fifth switch Q3 is connected to the other end of the first resistor R18 and the cathode of the Zener diode ZD1. The other end of the second resistor R21 is connected to the cathode of the second diode D3. The anode of the second diode D3 is connected to the first end of the auxiliary winding 730. The second end of the auxiliary winding 730 is connected to the anode of the Zener diode ZD1, the voltage detection terminal of the primary-side controller 310, the other end of the second capacitor C2, and the other end of the third capacitor C4.

[0078] This embodiment optimizes the power supply stability of the primary-side controller 310 and reduces overall power consumption through the auxiliary power supply unit 900. The auxiliary winding 730 provides voltage via the third diode D11, the first diode D2, and the third resistor R7 to the fifth switch Q3, the fourth switch Q2, and the power supply terminal of the primary-side controller 310, thus providing an independent and stable operating power supply for the primary-side controller 310. The auxiliary power supply unit 900 clamps the voltage using a Zener diode ZD1 to ensure the supply voltage is stable at 12-15V, matching the rated operating voltage of the primary-side controller 310, preventing overvoltage damage and improving operational stability. Furthermore, the auxiliary winding 730 has a connection point with the same voltage to ground as the primary-side winding 710, while the voltage of the entire auxiliary winding 730 is 2.5 times that of the primary-side winding 710, ensuring a voltage margin for the auxiliary power supply and enabling the system to maintain a stable power supply under different load conditions.

[0079] It should be noted that in traditional designs, the primary-side controller 310 typically relies on a low-dropout regulator for voltage reduction and regulation. However, in this embodiment, the auxiliary power supply unit 900 directly provides a stable voltage from the auxiliary winding 730, thereby reducing power loss caused by the low-dropout regulator and improving overall energy efficiency. Simultaneously, the design of the auxiliary power supply unit 900 further optimizes system power distribution, enabling the primary-side control circuit 300 to maintain a stable and reliable power supply in different operating modes, improving conversion efficiency and reducing additional heat loss, thus contributing to improved overall charger performance and reliability.

[0080] Furthermore, refer to Figure 3-4 The primary-side control circuit 300 further includes an overvoltage protection unit 340 composed of a fourth resistor R1, a fifth resistor R2, and a sixth resistor R5. One end of the overvoltage protection unit 340 is grounded, and the other end is connected to the voltage detection terminal of the primary-side controller 310. In this embodiment, the overvoltage protection unit 340, composed of the fourth resistor R1, the fifth resistor R2, and the sixth resistor R5, limits the voltage at the voltage detection terminal of the primary-side controller 310 during abnormal voltage fluctuations, preventing the controller from being damaged due to excessively high input voltage, improving system reliability, optimizing voltage regulation performance, and enhancing safety.

[0081] The above is only used to illustrate the technical solution of this utility model and not to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A power supply device with zero-power standby function, characterized in that, The application relates to an AC-DC power supply device, comprising: an AC power supply for providing AC power; an AC-DC conversion unit connected to the AC power supply for converting the AC power into DC power; a primary side control circuit connected to the AC-DC conversion unit for outputting a switching signal according to a feedback signal; a first power supply interface and a second power supply interface for connecting a load; a secondary side control circuit coupled to the first power supply interface and the second power supply interface, and communicating with the load through the first power supply interface and / or the second power supply interface, and generating a feedback signal to the primary side control circuit; wherein when the secondary side control circuit determines that the load is not coupled to the first power supply interface and / or the second power supply interface, the secondary side control circuit adjusts the feedback signal to a preset state, and the primary side control circuit enters a hiccup mode after receiving the feedback signal.

2. The power supply device having a zero power consumption standby function according to claim 1, wherein, The application further comprises a transformer and a synchronous rectification unit, wherein the transformer comprises a primary side winding, a secondary side winding and an auxiliary winding, the primary side winding is connected between the primary side control circuit and the AC-DC conversion unit, the secondary side winding is connected to the secondary side control circuit and the synchronous rectification unit, and the auxiliary winding is connected to a power supply end of the primary side control circuit.

3. The power supply device having a zero power consumption standby function according to claim 2, wherein The secondary side control circuit comprises a feedback unit, a BUCK-BOOST unit, a first secondary side control unit and a second secondary side control unit, wherein: a power supply end of the BUCK-BOOST unit is connected to a voltage output end of the synchronous rectification unit, and a voltage output end of the BUCK-BOOST unit is connected to the second secondary side control unit; the voltage output end of the synchronous rectification unit is connected to a power supply end of the first secondary side control unit; an optocoupler control end of the first secondary side control unit is connected to a feedback signal receiving end of the primary side control circuit through the feedback unit; the first secondary side control unit is connected to the first power supply interface, and the second secondary side control unit is connected to the second power supply interface.

4. The power supply device having a zero power consumption standby function according to claim 3, wherein The first secondary side control unit comprises a first secondary side controller and a first switch tube, and the second secondary side control unit comprises a second secondary side controller and a second switch tube, wherein: a first end of the first switch tube is connected to the voltage output end of the synchronous rectification unit, a second end of the first switch tube is connected to a switching drive end of the first secondary side controller, and a third end of the first switch tube is connected to a VBUS pin of the first power supply interface and a power supply detection end of the first secondary side controller; a first end of the second switch tube is connected to the voltage output end of the BUCK-BOOST unit, a second end of the second switch tube is connected to a switching drive end of the second secondary side controller, and a third end of the second switch tube is connected to a VBUS pin of the second power supply interface and a power supply detection end of the second secondary side controller; a cc communication end of the first secondary side controller is connected to a cc pin of the first power supply interface, and a cc communication end of the second secondary side controller is connected to a cc pin of the second power supply interface.

5. The power supply device having a zero power consumption standby function according to claim 4, wherein The primary side control circuit comprises a primary side controller, a third switch tube, a fourth switch tube and a first capacitor, wherein: The feedback input end of the primary side controller is connected to the second end of the fourth switch tube, the first end of the fourth switch tube is connected to the voltage output end of the AC-DC conversion unit, the third end of the fourth switch tube is connected to the power supply end of the primary side controller and the auxiliary winding, the first end of the third switch tube is connected to the primary side winding, the second end of the third switch tube is connected to the external driving end of the primary side controller, the third end of the third switch tube is grounded, and the first capacitor is connected in parallel to the first end and the third end of the third switch tube.

6. The power supply device having a zero power consumption standby function according to claim 5, wherein An auxiliary power supply unit is further included, which comprises a first diode, a second diode, a third diode, a voltage stabilizing diode, a fifth switch tube, a first resistor, a second resistor, a third resistor, a second capacitor and a third capacitor, a connection point is arranged on the auxiliary winding, the connection point is connected to the anode of the first diode, the third end of the fifth switch tube, the third end of the fourth switch tube and the power supply end of the primary side controller through the third diode and the third resistor, the first end of the fifth switch tube is connected to the cathode of the first diode, one end of the first resistor, one end of the second resistor, one end of the second capacitor and one end of the third capacitor, the second end of the fifth switch tube is connected to the other end of the first resistor and the cathode of the voltage stabilizing diode, the other end of the second resistor is connected to the cathode of the second diode, the anode of the second diode is connected to the first end of the auxiliary winding, and the second end of the auxiliary winding is connected to the anode of the voltage stabilizing diode, the voltage detection end of the primary side controller, the other end of the second capacitor and the other end of the third capacitor.

7. The power supply device having a zero power consumption standby function according to claim 6, wherein The primary side control circuit further comprises an overvoltage protection unit composed of a fourth resistor, a fifth resistor and a sixth resistor, one end of the overvoltage protection unit is grounded, and the other end is connected to the voltage detection end of the primary side controller.

8. The power supply device having a zero power consumption standby function according to claim 4, wherein The first secondary side control unit further comprises a sixth switch tube, the first end of the sixth switch tube is connected between the cc communication end of the first secondary side controller and the cc pin of the first power supply interface, the second end of the sixth switch tube is connected to the E-MARK detection port of the first secondary side controller, and the third end of the sixth switch tube is connected between the cc communication end of the second secondary side controller and the cc pin of the second power supply interface.

9. The power supply device having a zero power consumption standby function according to claim 4, wherein, Fourth and fifth diodes are further included, and the fast charging protocol end of the first secondary side controller is connected between the cc communication end of the second secondary side controller and the cc pin of the second power supply interface through the fourth and fifth diodes.

10. The power supply device having a zero power consumption standby function according to claim 4, wherein, The power balance end of the first secondary side controller is connected to the power balance end of the second secondary side controller.

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