An energy storage type charging device

Abstract

The utility model provides a kind of energy storage type charging device, comprising: AC-DC conversion circuit unit, for converting commercial power into low voltage direct current;Energy storage battery control circuit unit is electrically connected with the AC-DC conversion circuit unit, for managing the charge-discharge process of the energy storage type charging device;Type-C interface unit is electrically connected with the AC-DC conversion circuit unit respectively, the energy storage battery control circuit unit, for external charging and energy interaction.The utility model solves the technical problem of single function and insufficient convenience of existing charging device.

Description

Technical Field

[0001] This utility model relates to the field of charging technology, and more specifically to an energy storage charging device. Background Technology

[0002] With the increasing use of mobile electronic devices, users are placing higher demands on the portability and environmental adaptability of charging devices. Traditional direct-chargers rely on mains power, which cannot meet the emergency charging needs of scenarios such as fieldwork, travel, or sudden power outages. Meanwhile, independent energy storage devices (such as power banks) require pre-charging via an external charger and cannot be integrated with mains charging, resulting in users having to carry multiple devices, leading to high costs and cumbersome operation. Therefore, the limited functionality and convenience of charging devices result in a poor charging experience for users in complex scenarios. How to provide a charging device that integrates mains power conversion and energy storage management functions and is compatible with mainstream fast-charging protocols has become a pressing technical problem to be solved in this field. Utility Model Content

[0003] The purpose of this utility model is to overcome the defects of the prior art and provide an energy storage charging device, which aims to solve the technical problems of the limited functionality and lack of convenience of the existing charging devices.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An energy storage charging device includes:

[0006] AC-DC conversion circuit unit, used to convert AC mains power into low-voltage DC power;

[0007] The energy storage battery control circuit unit is electrically connected to the AC-DC conversion circuit unit and is used to manage the charging and discharging process of the energy storage charging device;

[0008] The Type-C interface unit is electrically connected to the AC-DC conversion circuit unit and the energy storage battery control circuit unit, respectively, for external charging and energy exchange.

[0009] In one embodiment, the AC-DC conversion circuit unit includes:

[0010] The input filtering and rectification module includes a fuse F1, a thermistor SD-5, a common-mode inductor LF1, and a rectifier bridge BD1. One end of the fuse F1 is connected to the mains live wire, and the other end is connected to the thermistor SD-5. The thermistor SD-5 is connected to the common-mode inductor LF1. The common-mode inductor LF1 is connected to the input terminal of the rectifier bridge BD1. The neutral terminal of the rectifier bridge BD1 is connected to the mains neutral wire through the common-mode inductor LF1. The output terminal of the rectifier bridge BD1 is grounded through a first electrolytic capacitor EC1 and a second electrolytic capacitor EC2.

[0011] The transformer module includes a transformer T1, wherein the first and fifth pins on the primary side of the transformer T1 are connected to the output terminal of the rectifier bridge BD1;

[0012] The secondary rectifier and filter module is connected to the sixth and seventh pins of the secondary side of the transformer T1. The secondary rectifier and filter module includes a synchronous rectifier chip U2, a third electrolytic capacitor EC4, and a fourth electrolytic capacitor EC5. The input terminal of the synchronous rectifier chip U2 is connected to the secondary side of the transformer T1, and the output terminal of the synchronous rectifier chip U2 is connected to the Type-C interface unit and the energy storage battery control circuit unit through the third electrolytic capacitor EC4 and the fourth electrolytic capacitor EC5.

[0013] In one embodiment, the AC-DC conversion circuit unit further includes:

[0014] The pulse width control switch module includes a switching transistor Q1 and a PWM control chip U1; the drain of the switching transistor Q1 is connected to the fifth pin of the primary side of the transformer T1, the source of the switching transistor Q1 is grounded, and the gate of the switching transistor Q1 is connected to the fifth pin of the PWM control chip U1; the eighth pin of the PWM control chip U1 is connected to the neutral wire and the live wire of the mains power supply through a first resistor R6, a second resistor R7, a first diode D1, and a second diode D2.

[0015] In one embodiment, the AC-DC conversion circuit unit further includes:

[0016] The protocol control module includes a first protocol chip U2 and a second protocol chip U4. The first protocol chip U2 is integrated with the synchronous rectification chip U2. The output of the first protocol chip U2 is connected to the secondary rectification and filtering module. The input of the first protocol chip U2 communicates with external devices through the D+ / D- pins of the Type-C interface unit. The PIN4-D+ pin of the second protocol chip U4 is connected to the corresponding pins of the Type-C interface unit through the PIN5-D- pin of the third resistor R36, the PIN6-CC1 pin of the fourth resistor R37, the PIN7-CC2 pin of the fifth resistor R38, and the sixth resistor R39, respectively.

[0017] In one embodiment, the AC-DC conversion circuit unit further includes:

[0018] The sampling feedback module includes an optocoupler U3, a seventh resistor R24, an eighth resistor R25, a ninth resistor R34, a tenth resistor R35, and a first capacitor C14, a second capacitor C20, and a third capacitor C21. The PIN1 pin of the optocoupler U3 is connected to the positive terminal of the secondary side of the transformer T1. The PIN2 pin of the optocoupler U3 is connected to the output terminal of the secondary rectifier filter module through the eighth resistor R25. The PIN4 pin of the optocoupler U3 is connected to the PIN2-FB pin of the PWM control chip U1 through the seventh resistor R24. The first capacitor C14, the second capacitor C20, and the third capacitor C21 are connected in parallel in the feedback loop between the optocoupler U3 and the second protocol chip U4.

[0019] In one embodiment, the AC-DC conversion circuit unit further includes:

[0020] The output overcurrent / short circuit protection module includes an eleventh resistor R22, which is connected in series to the negative output terminal of the secondary rectifier and filter module; and the two ends of the eleventh resistor R22 are respectively connected to the PIN8-IS+ pin and the PIN9-IS- pin of the second protocol chip U4.

[0021] In one embodiment, the energy storage battery control circuit unit includes an energy storage battery BAT;

[0022] The positive terminal of the energy storage battery BAT is connected to the SW pin of the second protocol chip U4 through inductor L3 and the first energy storage capacitor C36, the second energy storage capacitor C37, and the third energy storage capacitor C38; the negative terminals of the first energy storage capacitor C36, the second energy storage capacitor C37, and the third energy storage capacitor C38 are grounded.

[0023] The BVBUSC pin of the second protocol chip U4 is connected to the positive Vbus terminal of the Type-C interface unit, the BAT pin of the second protocol chip U4 is connected to the positive BAT terminal of the energy storage battery, and the VOUT pin of the second protocol chip U4 is connected to the positive Vbus terminal of the Type-C interface unit through the fourth energy storage capacitor C31, the fifth energy storage capacitor C32, and the sixth energy storage capacitor C33; the negative terminals of the fourth energy storage capacitor C31, the fifth energy storage capacitor C32, and the sixth energy storage capacitor C33 are grounded; the BAT pin is used to monitor the voltage of the energy storage battery BAT to confirm the remaining power.

[0024] In one embodiment, the energy storage battery control circuit unit further includes:

[0025] The power display module includes a first indicator LED1, a second indicator LED2, a third indicator LED3, a fourth indicator LED4, and a twelfth resistor R41. The LED1 / SCK pin of the second protocol chip U4 is connected to the negative terminal of the first indicator LED1, the negative terminal of the third indicator LED3, the positive terminal of the second indicator LED2, and the positive terminal of the fourth indicator LED4 through the twelfth resistor R41. The positive terminals of the first indicator LED1 and the negative terminals of the second indicator LED2 are connected to the LED2 / SDA pin of the second protocol chip U4, and the positive terminals of the third indicator LED3 and the negative terminals of the fourth indicator LED4 are connected to the LED3 / IRQ pin of the second protocol chip U4.

[0026] In one embodiment, the energy storage battery control circuit unit further includes:

[0027] The overcurrent-short circuit protection module includes a thirteenth resistor R40, which is connected in series between the VOUT pin of the second protocol chip U4 and the positive terminal of the Type-C interface unit Vbus; the two ends of the thirteenth resistor R40 are respectively connected to the VOUTSN and VOUTSP pins of the second protocol chip U4.

[0028] In one embodiment, the energy storage battery control circuit unit further includes:

[0029] The over-temperature protection module includes a negative temperature coefficient thermistor RT4 and a fourteenth resistor R45; one end of the fourteenth resistor R45 is connected to the NTC pin of the second protocol chip U4, and the other end is connected to the negative temperature coefficient thermistor RT4; the negative temperature coefficient thermistor RT4 is grounded.

[0030] The advantages of this invention compared to existing technologies are: by coordinating the AC-DC conversion circuit unit and the energy storage battery control circuit unit, it achieves integrated dual-mode charging and energy storage discharging. In environments with mains power, the AC-DC conversion circuit unit directly converts mains power into low-voltage DC power to charge external devices and store energy in the energy storage battery. In scenarios without mains power, the energy storage battery control circuit unit uses a boost mechanism and a Type-C interface unit to power the device, overcoming the limitations of traditional chargers that rely on a fixed power source. This makes it particularly suitable for emergency rescue, outdoor office, and other scenarios, significantly improving the device's environmental adaptability.

[0031] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model, it can be implemented according to the contents of the specification. In order to make the above and other objects, features and advantages of this utility model more obvious and easy to understand, the following are preferred embodiments, which are described in detail below. Attached Figure Description

[0032] Figure 1 A module block diagram of an energy storage charging device provided by this utility model;

[0033] Figure 2 A block diagram of an AC-DC conversion circuit unit for an energy storage charging device provided by this utility model;

[0034] Figure 3 A block diagram of the energy storage battery control circuit unit of an energy storage charging device provided by this utility model;

[0035] Figure 4 A circuit diagram of an energy storage charging device provided by this utility model.

[0036] Figure Labels

[0037] 100. AC-DC conversion circuit unit; 110. Input filtering and rectification module; 120. Transformer module; 130. Secondary rectification and filtering module; 140. Pulse width control switch module; 150. Protocol control module; 160. Sampling feedback module; 170. Output overcurrent / short circuit protection module; 200. Energy storage battery control circuit unit; 210. Energy storage battery BAT; 220. Power display module; 230. Overcurrent / short circuit protection module; 240. Overtemperature protection module; 300. Type-C interface unit. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

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

[0040] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0041] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0042] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0043] See Figures 1 to 4 As shown, this utility model embodiment discloses an energy storage charging device, comprising:

[0044] AC-DC conversion circuit unit 100 is used to convert AC power into low-voltage DC power;

[0045] The energy storage battery control circuit unit 200 is electrically connected to the AC-DC conversion circuit unit 100 and is used to manage the charging and discharging process of the energy storage charging device.

[0046] The Type-C interface unit 300 is electrically connected to the AC-DC conversion circuit unit 100 and the energy storage battery control circuit unit 200, respectively, for external charging and energy exchange.

[0047] Specifically, this energy storage charging device comprises three core units:

[0048] AC-DC conversion circuit unit 100 has its input terminal connected to AC power and its output terminal connected to Type-C interface unit 300. It is used to convert 90-264Vac AC power into low-voltage DC power (such as 5V, 9V, 12V, etc.) and supports direct charging of external devices and charging of energy storage batteries.

[0049] The energy storage battery control circuit unit 200 is electrically connected to the AC-DC conversion circuit unit 100 via wires. It contains an energy storage battery and a control chip, which is used to manage the charging and discharging process of the energy storage battery and to supply power to the device through a boost circuit when there is no mains power.

[0050] The Type-C interface unit 300 adopts a USB Type-C physical interface and is electrically connected to the output terminals of the AC-DC conversion circuit unit 100 and the energy storage battery control circuit unit 200 through the Vbus pin to realize bidirectional power transmission; at the same time, it communicates with external devices through the D+ / D- / CC1 / CC2 pins to complete the fast charging protocol handshake.

[0051] Through the electrical interconnection of the three units, a closed-loop energy flow is achieved, from "mains power conversion → energy storage management → interface output." Utilizing the bidirectional power supply characteristic of the Type-C interface, it is compatible with both direct charging and energy storage discharge modes. During operation, in direct charging mode, the AC-DC unit converts mains power to DC power and outputs it directly to the device via the Type-C interface, simultaneously charging the energy storage battery. In energy storage mode, when the energy storage battery control unit detects no mains power input, it boosts the battery voltage (e.g., 3.7V) to the required voltage for the device via an internal boost circuit and outputs it via the Type-C interface. Dual-mode charging meets the needs of multiple scenarios. In emergency situations, it eliminates the need for mains power, significantly shortening the switching time between mains power and energy storage modes. Seamless switching is achieved through VBUS voltage detection via the Type-C interface, making it suitable for emergency power supply in sudden power outage scenarios (such as ensuring the continued operation of office equipment). Simultaneously, the Type-C interface unifies input and output, simplifying the device structure.

[0052] In one embodiment, the AC-DC conversion circuit unit 100 includes:

[0053] The input filtering and rectification module 110 includes a fuse F1, a thermistor SD-5, a common-mode inductor LF1, and a rectifier bridge BD1. One end of the fuse F1 is connected to the mains live wire, and the other end is connected to the thermistor SD-5. The thermistor SD-5 is connected to the common-mode inductor LF1. The common-mode inductor LF1 is connected to the input terminal of the rectifier bridge BD1. The neutral terminal of the rectifier bridge BD1 is connected to the mains neutral wire through the common-mode inductor LF1. The output terminal of the rectifier bridge BD1 is grounded through a first electrolytic capacitor EC1 and a second electrolytic capacitor EC2.

[0054] Transformer module 120 includes transformer T1, wherein the first and fifth pins on the primary side of transformer T1 are connected to the output terminal of rectifier bridge BD1;

[0055] The secondary rectifier and filter module 130 is connected to the sixth and seventh pins of the secondary side of the transformer T1. The secondary rectifier and filter module 130 includes a synchronous rectifier chip U2, a third electrolytic capacitor EC4, and a fourth electrolytic capacitor EC5. The input terminal of the synchronous rectifier chip U2 is connected to the secondary side of the transformer T1, and the output terminal of the synchronous rectifier chip U2 is connected to the Type-C interface unit 300 and the energy storage battery control circuit unit 200 through the third electrolytic capacitor EC4 and the fourth electrolytic capacitor EC5.

[0056] Specifically, the AC-DC conversion circuit unit 100 includes:

[0057] Input filter and rectifier module 110:

[0058] Fuse F1 (250V / 2A) is connected in series with the mains live wire input terminal. When the current exceeds 2A, the fuse will blow to protect the circuit.

[0059] A thermistor SD-5 (NTC type, 10Ω) is connected in parallel to the back end of the fuse to suppress the inrush current at startup;

[0060] The two windings of the common-mode inductor LF1 (10mH) are connected in series with the live wire and the neutral wire, respectively, to filter out common-mode interference in the mains power.

[0061] The rectifier bridge BD1 (composed of four 1N4007 diodes) rectifies the AC power into pulsating DC power, which is then filtered by the first electrolytic capacitor EC1 (100μF / 400V) and the second electrolytic capacitor EC2 (100μF / 400V) to output approximately 310Vdc.

[0062] Transformer Module 120:

[0063] Transformer T1 is a flyback transformer. The first and fifth pins on the primary side are connected to the positive output of rectifier bridge BD1, and the sixth and seventh pins on the secondary side output low-voltage AC power (such as 12Vac).

[0064] Secondary rectifier and filter module 130:

[0065] The input of the synchronous rectifier chip U2 (AOZ1284) is connected to the secondary side of transformer T1. The output is filtered by the third electrolytic capacitor EC4 (470μF / 25V) and the fourth electrolytic capacitor EC5 (470μF / 25V) to output a stable low-voltage DC power (such as 5Vdc) to the Type-C interface unit 300.

[0066] Multi-stage filtering suppresses electromagnetic interference, a flyback transformer is used for voltage conversion, and synchronous rectification technology reduces secondary-side losses and improves conversion efficiency. The input filtering circuit reduces EMI noise; synchronous rectification offers improved efficiency compared to traditional Schottky rectification.

[0067] In one embodiment, the AC-DC conversion circuit unit 100 further includes:

[0068] The pulse width control switch module 140 includes a switching transistor Q1 and a PWM control chip U1; the drain of the switching transistor Q1 is connected to the fifth pin of the primary side of the transformer T1, the source of the switching transistor Q1 is grounded, and the gate of the switching transistor Q1 is connected to the fifth pin of the PWM control chip U1; the eighth pin of the PWM control chip U1 is connected to the neutral wire and the live wire of the mains power supply through a first resistor R6, a second resistor R7, a first diode D1, and a second diode D2.

[0069] Specifically, the pulse width control switch module 140 includes:

[0070] Switch Q1 (NMOS, AO3400, withstand voltage 100V): The drain is connected to the fifth pin of the primary side of transformer T1, the source is grounded, and the gate is connected to the fifth pin (GATE output) of PWM control chip U1. It is turned on / off by the PWM signal.

[0071] PWM control chip U1 (OB2632CP): The eighth pin (HV pin) is connected to the neutral and live wires of the mains power supply through a voltage divider circuit consisting of the first resistor R6 (100kΩ), the second resistor R7 (100kΩ), the first diode D1, and the second diode D2, and monitors the input voltage in real time.

[0072] During operation, the PWM control chip U1 generates PWM pulses based on the sampled feedback signal, driving the switching transistor Q1 to switch at a fixed frequency (e.g., 65kHz). By adjusting the duty cycle (5%-95%), it controls the energy transfer on the primary side of the transformer, thereby stabilizing the secondary output voltage. When the input voltage exceeds 264Vac, chip U1 triggers overvoltage protection and stops outputting the PWM signal. This increases the output voltage accuracy, meeting the voltage regulation requirements of fast charging protocols; and shortens the input overvoltage protection response time, preventing high voltage from damaging downstream components.

[0073] In one embodiment, the AC-DC conversion circuit unit 100 further includes:

[0074] The protocol control module 150 includes a first protocol chip U2 and a second protocol chip U4. The first protocol chip U2 is integrated with the synchronous rectification chip U2. The output of the first protocol chip U2 is connected to the secondary rectification and filtering module 130. The input of the first protocol chip U2 communicates with external devices through the D+ / D- pins of the Type-C interface unit 300. The PIN4-D+ pin of the second protocol chip U4 is connected to the corresponding pins of the Type-C interface unit 300 through the PIN5-D- pin of the third resistor R36, the PIN6-CC1 pin of the fourth resistor R37, the PIN7-CC2 pin of the fifth resistor R38, and the sixth resistor R39, respectively.

[0075] Specifically, the protocol control module 150 includes:

[0076] The first protocol chip U2 (integrated within the synchronous rectifier chip U2) has its output connected to the DC output of the secondary rectifier filter module 130, and its input communicates with external devices through the D+ / D- pins of the Type-C interface. It supports the QC3.0 protocol, can identify the voltage requested by the device (such as 5V, 9V), and feeds it back to the PWM control chip U1 through the optocoupler U3 to adjust the output.

[0077] The second protocol chip U4 (SW6206): PIN4-D+ is connected to the corresponding pin of the Type-C interface through the third resistor R36 (10kΩ), PIN5-D- through the fourth resistor R37 (10kΩ), PIN6-CC1 through the fifth resistor R38 (5.1kΩ), and PIN7-CC2 through the sixth resistor R39 (5.1kΩ). It supports the PD3.0 protocol and is used for fast charging protocol handshake in energy storage mode.

[0078] The dual-protocol chip architecture supports different fast charging protocols, transmitting protocol signals through the standard pins of the Type-C interface to achieve voltage negotiation between the device and the charging unit. During operation, when an external device is plugged into the Type-C interface, either the first protocol chip U2 (direct charging mode) or the second protocol chip U4 (energy storage mode) sends protocol messages through the D+ / D- / CC1 / CC2 pins. The device returns the required voltage information (e.g., 5V@3A), and the protocol chip adjusts the feedback signal to ensure the AC-DC unit or energy storage unit outputs the corresponding voltage. This dual-protocol chip architecture is compatible with mainstream QC / PD fast charging protocols and supports a wide voltage output range of 3.3-21V; it also shortens the protocol handshake time, enabling rapid identification of device requirements.

[0079] In one embodiment, the AC-DC conversion circuit unit 100 further includes:

[0080] The sampling feedback module 160 includes an optocoupler U3, a seventh resistor R24, an eighth resistor R25, a ninth resistor R34, a tenth resistor R35, and a first capacitor C14, a second capacitor C20, and a third capacitor C21. The PIN1 pin of the optocoupler U3 is connected to the positive terminal of the secondary side of the transformer T1. The PIN2 pin of the optocoupler U3 is connected to the output terminal of the secondary rectifier filter module 130 through the eighth resistor R25. The PIN4 pin of the optocoupler U3 is connected to the PIN2-FB pin of the PWM control chip U1 through the seventh resistor R24. The first capacitor C14, the second capacitor C20, and the third capacitor C21 are connected in parallel in the feedback loop between the optocoupler U3 and the second protocol chip U4.

[0081] Specifically, the sampling feedback module 160 includes:

[0082] Optocoupler U3 (TLP181): PIN1 is connected to the positive terminal of the secondary side of transformer T1, PIN2 is connected to the output terminal (VBUS) of secondary rectifier filter module 130 through the eighth resistor R25 (10kΩ), and PIN4 is connected to the PIN2-FB pin (voltage feedback terminal) of PWM control chip U1 through the seventh resistor R24 ​​(10kΩ).

[0083] The first capacitor C14 (100nF), the second capacitor C20 (100nF), and the third capacitor C21 (100nF) are connected in parallel in the feedback loop between the optocoupler U3 and the second protocol chip U4 to filter out high-frequency noise.

[0084] During operation, the output voltage of the secondary rectifier and filter module 130 is divided by the eighth resistor R25, driving the internal LED of the optocoupler U3 to conduct the phototransistor between PIN3 and PIN4. This converts the output voltage signal into a current signal, which is then fed back to the PWM control chip U1. Chip U1 adjusts the PWM duty cycle according to the feedback signal, forming a closed-loop voltage regulation control. This increases the bandwidth of the voltage feedback loop, resulting in a faster dynamic response; the optocoupler isolates strong and weak currents, improving anti-interference capability and safety.

[0085] In one embodiment, the AC-DC conversion circuit unit 100 further includes:

[0086] The output overcurrent / short circuit protection module 170 includes an eleventh resistor R22, which is connected in series to the negative output terminal of the secondary rectifier and filter module 130; and the two ends of the eleventh resistor R22 are respectively connected to the PIN8-IS+ pin and the PIN9-IS- pin of the second protocol chip U4.

[0087] Specifically, the output overcurrent / short circuit protection module 170 includes:

[0088] Resistor R22 (5mΩ / 1210 package): Connected in series to the negative output terminal (GND) of the secondary rectifier filter module 130, with its two ends connected to the PIN8-IS+ and PIN9-IS- pins of the second protocol chip U4, respectively. During operation in this embodiment, when the output current flows through R22, a voltage difference (ΔV = I × 5mΩ) is generated across it. The second protocol chip U4 monitors ΔV in real time. When the current exceeds a preset threshold (e.g., 3A), overcurrent protection is triggered, cutting off the output by turning off the drive signal of the synchronous rectifier chip U2. If a short circuit occurs (ΔV increases sharply), it quickly shuts off to prevent overheating and damage to the device. The overcurrent protection threshold accuracy is increased, supporting self-recovery from load short circuits; simultaneously, the low-resistance sampling resistor (5mΩ) is reduced, improving overall efficiency.

[0089] In one embodiment, the energy storage battery control circuit unit 200 includes an energy storage battery BAT210;

[0090] The positive terminal of the energy storage battery BAT210 is connected to the SW pin of the second protocol chip U4 through inductor L3 and the first energy storage capacitor C36, the second energy storage capacitor C37, and the third energy storage capacitor C38; the negative terminals of the first energy storage capacitor C36, the second energy storage capacitor C37, and the third energy storage capacitor C38 are grounded.

[0091] The BVBUSC pin of the second protocol chip U4 is connected to the positive Vbus terminal of the Type-C interface unit 300, the BAT pin of the second protocol chip U4 is connected to the positive terminal of the energy storage battery BAT210, and the VOUT pin of the second protocol chip U4 is connected to the positive Vbus terminal of the Type-C interface unit 300 through the fourth energy storage capacitor C31, the fifth energy storage capacitor C32, and the sixth energy storage capacitor C33; the negative terminals of the fourth energy storage capacitor C31, the fifth energy storage capacitor C32, and the sixth energy storage capacitor C33 are grounded; the BAT pin is used to monitor the voltage of the energy storage battery BAT210 to confirm the remaining power.

[0092] Specifically, the energy storage battery control circuit unit 200 includes:

[0093] The positive terminal of the BAT210 energy storage battery is connected to the SW pins (PIN2-6) of the second protocol chip U4 via inductor L3 (2.2μH) and the first energy storage capacitor C36 (100μF / 16V), the second energy storage capacitor C37 (100μF / 16V), and the third energy storage capacitor C38 (100μF / 16V). The negative terminal is grounded. It can be understood that the BAT210 energy storage battery is a 3.7V / 2000mAh lithium-ion battery.

[0094] The second protocol chip U4 (SW6206): The BVBUSC pin (PIN12) is connected to the positive terminal of the Vbus of the Type-C interface for detecting AC power input; the BAT pin (PIN17) is connected to the positive terminal of the energy storage battery and has a built-in 12-bit ADC to monitor the battery voltage in real time; the VOUT pins (PIN29-33) are connected to the positive terminal of the Vbus of the Type-C interface through the fourth energy storage capacitor C31 (100μF / 16V), the fifth energy storage capacitor C32 (100μF / 16V), and the sixth energy storage capacitor C33 (100μF / 16V) to output boosted DC power.

[0095] It is understood that the SW6206 chip in this embodiment integrates a bidirectional DC-DC converter. In AC power mode, it charges the battery through a step-down circuit (VBUS→BAT), and in energy storage mode, it supplies power to the device through a boost circuit (BAT→VOUT). It also uses an internal ADC to achieve accurate monitoring of the battery voltage.

[0096] In charging mode, when the BVBUSC pin detects a voltage ≥4.5V (AC input), the SW6206 starts buck mode and charges the battery through the VOUT pin with a charging current of 1A (constant current stage). After the voltage rises to 4.2V, it switches to constant voltage mode. In discharging mode, when the BVBUSC pin voltage is <4V, the boost mode is started, boosting the battery voltage to 5V / 9V / 12V (according to the protocol negotiation result) and outputting it through the VOUT pin.

[0097] In one embodiment, the energy storage battery control circuit unit 200 further includes:

[0098] The power display module 220 includes a first indicator LED1, a second indicator LED2, a third indicator LED3, a fourth indicator LED4, and a twelfth resistor R41. The LED1 / SCK pin of the second protocol chip U4 is connected to the negative terminal of the first indicator LED1, the negative terminal of the third indicator LED3, the positive terminal of the second indicator LED2, and the positive terminal of the fourth indicator LED4 through the twelfth resistor R41. The positive terminal of the first indicator LED1 and the negative terminal of the second indicator LED2 are connected to the LED2 / SDA pin of the second protocol chip U4, and the positive terminal of the third indicator LED3 and the negative terminal of the fourth indicator LED4 are connected to the LED3 / IRQ pin of the second protocol chip U4.

[0099] Specifically, the power display module 220 includes: a first indicator LED1, a second indicator LED2, a third indicator LED3, and a fourth indicator LED4. It is understood that the indicator lights LED1, LED2, LED3, and LED4 are all different colors to indicate different states. Further, the negative terminals of LED1 and LED3 are connected to PIN26 (LED1 / SCK) of the second protocol chip U4 via a twelfth resistor R41 (1kΩ); the positive terminals of LED1 and LED2 are connected to PIN25 (LED2 / SDA); and the positive terminals of LED3 and LED4 are connected to PIN24 (LED3 / IRQ).

[0100] During operation, the second protocol chip U4 controls the LED indicator status via the I2C bus based on the battery voltage monitored by the BAT pin. For example, in this embodiment:

[0101] When the voltage is ≥3.85V (power 75%-100%), all LEDs 1-4 will light up.

[0102] When 3.75V ≤ voltage < 3.85V (50%-75%), LED1-LED3 are lit;

[0103] When 3.65V ≤ voltage < 3.75V (25%-50%), LED1-LED2 light up;

[0104] When 3.5V ≤ voltage < 3.65V (5%-25%), LED1 lights up;

[0105] When the voltage is <3.5V (<5%), LED1 flashes (frequency 1Hz);

[0106] In case of an abnormal condition (such as overcurrent / overtemperature), LED1-LED4 will flash 5 times synchronously and then turn off.

[0107] By reducing the power display accuracy by four levels to 25%, users can intuitively judge the remaining power; when an abnormal state occurs, an alarm light will be activated to improve the safety of the device.

[0108] In one embodiment, the energy storage battery control circuit unit 200 further includes:

[0109] The overcurrent-short circuit protection module 230 includes a thirteenth resistor R40, which is connected in series between the VOUT pin of the second protocol chip U4 and the positive terminal of the Type-C interface unit 300Vbus; the two ends of the thirteenth resistor R40 are respectively connected to the VOUTSN and VOUTSP pins of the second protocol chip U4.

[0110] Specifically, the overcurrent-short circuit protection module 230 includes a thirteenth resistor R40 (6mΩ / 1210 package): the thirteenth resistor R40 is connected in series between the VOUT pin of the second protocol chip U4 and the positive terminal of the Type-C interface Vbus, and its two ends are connected to the VOUTSN (PIN28) and VOUTSP (PIN27) pins of the SW6206, respectively. During operation, the SW6206 chip determines the output current by monitoring the voltage difference (ΔV=I×6mΩ) across R40.

[0111] When the current exceeds 2.5A (ΔV≥15mV), the overcurrent protection is triggered, the internal switching transistor is turned off, and an automatic recovery is attempted after 500ms.

[0112] When the current exceeds 5A (short circuit scenario), the output will be immediately cut off and locked. The protection needs to be released by unplugging and plugging back into the Type-C interface.

[0113] By shortening the overcurrent protection response time, battery over-discharge is avoided; at the same time, short-circuit protection prevents the battery from experiencing sudden high-current discharge that could lead to safety hazards.

[0114] In one embodiment, the energy storage battery control circuit unit 200 further includes:

[0115] The over-temperature protection module 240 includes a negative temperature coefficient thermistor RT4 and a fourteenth resistor R45; one end of the fourteenth resistor R45 is connected to the NTC pin of the second protocol chip U4, and the other end is connected to the negative temperature coefficient thermistor RT4; the negative temperature coefficient thermistor RT4 is grounded.

[0116] Specifically, the over-temperature protection module 240 includes a negative temperature coefficient thermistor RT4 (100kΩ / 25℃). One end of the negative temperature coefficient thermistor RT4 is connected to the NTC pin (PIN18) of the second protocol chip U4 through the fourteenth resistor R45 (10kΩ), and the other end is grounded. During operation, RT4 is in close contact with the surface of the energy storage battery, and its resistance decreases as the temperature rises. The SW6206 chip detects the voltage divider value (V_NTC = 3.3V × R45 / (R45 + RT4)) through the NTC pin and calculates the battery temperature.

[0117] When the temperature is ≥60℃, the over-temperature protection is triggered, charging and discharging stop, and all LED indicators flash.

[0118] When the temperature drops below 40℃, it will automatically resume normal operation.

[0119] By improving the temperature response speed, the risk of thermal runaway in lithium batteries can be effectively prevented. Meanwhile, it is understood that in other embodiments, by replacing the fourteenth resistor R45 (e.g., from 10kΩ to 5kΩ), the over-temperature protection threshold can be adjusted from 60℃ to 55℃ or 65℃ to adapt to the temperature characteristics of different battery types (such as lithium iron phosphate / ternary lithium), thereby expanding the applicability range.

[0120] In summary, the energy storage charging device of this embodiment mainly includes an AC-DC conversion circuit unit 100, an energy storage battery control circuit unit 200, and a Type-C interface unit 300. The AC-DC conversion circuit unit 100 converts AC mains power into low-voltage DC power through components such as fuses, thermistors, common-mode inductors, rectifier bridges, transformers, synchronous rectifier chips, and filter capacitors. It also integrates a pulse width control switch module 140, a protocol control module 150, a sampling feedback module 160, and an output overcurrent / short-circuit protection module 170 to achieve voltage stability, fast charging protocol compatibility, and multiple safety protections. The energy storage battery control circuit unit 200 uses the second protocol chip U4 as its core and connects to components such as the energy storage battery, inductor, and energy storage capacitor. It manages battery charging and discharging through boost / buck circuits and is equipped with a power display module 220, an overcurrent-short-circuit protection module 230, and an overtemperature protection module 240 to achieve power monitoring, abnormal status prompts, and full-process safety protection. The Type-C interface unit 300 realizes protocol communication and energy interaction with external devices through the D+ / D- / CC1 / CC2 pins and the Vbus pin. The overall solution adopts a modular design to achieve dual-mode switching between direct AC charging and energy storage discharge, is compatible with mainstream fast charging protocols, and has multiple protection functions such as input overvoltage, output overcurrent / short circuit, and overtemperature, making it suitable for efficient and safe charging needs in various scenarios.

[0121] The above examples are merely illustrative of the technical content of this utility model to facilitate reader understanding, but do not imply that the implementation of this utility model is limited to these embodiments. Any technical extensions or re-creations made based on this utility model are protected by this utility model. The scope of protection of this utility model is defined by the claims.

Claims

1. An energy storage charging device, characterized in that, include: AC-DC conversion circuit unit, used to convert AC mains power into low-voltage DC power; The energy storage battery control circuit unit is electrically connected to the AC-DC conversion circuit unit and is used to manage the charging and discharging process of the energy storage charging device; The Type-C interface unit is electrically connected to the AC-DC conversion circuit unit and the energy storage battery control circuit unit, respectively, for external charging and energy exchange. The AC-DC conversion circuit unit includes: The input filtering and rectification module includes a fuse F1, a thermistor SD-5, a common-mode inductor LF1, and a rectifier bridge BD1. One end of the fuse F1 is connected to the mains live wire, and the other end is connected to the thermistor SD-5. The thermistor SD-5 is connected to the common-mode inductor LF1. The common-mode inductor LF1 is connected to the input terminal of the rectifier bridge BD1. The neutral terminal of the rectifier bridge BD1 is connected to the mains neutral wire through the common-mode inductor LF1. The output terminal of the rectifier bridge BD1 is grounded through a first electrolytic capacitor EC1 and a second electrolytic capacitor EC2. The transformer module includes a transformer T1, wherein the first and fifth pins on the primary side of the transformer T1 are connected to the output terminal of the rectifier bridge BD1; The secondary rectifier and filter module is connected to the sixth and seventh pins of the secondary side of the transformer T1. The secondary rectifier and filter module includes a synchronous rectifier chip U2, a third electrolytic capacitor EC4, and a fourth electrolytic capacitor EC5. The input terminal of the synchronous rectifier chip U2 is connected to the secondary side of the transformer T1, and the output terminal of the synchronous rectifier chip U2 is connected to the Type-C interface unit and the energy storage battery control circuit unit through the third electrolytic capacitor EC4 and the fourth electrolytic capacitor EC5. The protocol control module includes a first protocol chip U2 and a second protocol chip U4. The first protocol chip U2 is integrated with the synchronous rectification chip U2. The output of the first protocol chip U2 is connected to the secondary rectification and filtering module. The input of the first protocol chip U2 communicates with external devices through the D+ / D- pins of the Type-C interface unit. The PIN4-D+ pin of the second protocol chip U4 is connected to the corresponding pins of the Type-C interface unit through the PIN5-D- pin of the third resistor R36, the PIN6-CC1 pin of the fourth resistor R37, the PIN7-CC2 pin of the fifth resistor R38, and the sixth resistor R39, respectively. The energy storage battery control circuit unit also includes: The power display module includes a first indicator LED1, a second indicator LED2, a third indicator LED3, a fourth indicator LED4, and a twelfth resistor R41. The LED1 / SCK pin of the second protocol chip U4 is connected to the negative terminal of the first indicator LED1, the negative terminal of the third indicator LED3, the positive terminal of the second indicator LED2, and the positive terminal of the fourth indicator LED4 through the twelfth resistor R41. The positive terminals of the first indicator LED1 and the negative terminals of the second indicator LED2 are connected to the LED2 / SDA pin of the second protocol chip U4, and the positive terminals of the third indicator LED3 and the negative terminals of the fourth indicator LED4 are connected to the LED3 / IRQ pin of the second protocol chip U4.

2. The energy storage charging device according to claim 1, characterized in that, The AC-DC conversion circuit unit further includes: The pulse width control switch module includes a switching transistor Q1 and a PWM control chip U1; the drain of the switching transistor Q1 is connected to the fifth pin of the primary side of the transformer T1, the source of the switching transistor Q1 is grounded, and the gate of the switching transistor Q1 is connected to the fifth pin of the PWM control chip U1; the eighth pin of the PWM control chip U1 is connected to the neutral wire and the live wire of the mains power supply through a first resistor R6, a second resistor R7, a first diode D1, and a second diode D2.

3. The energy storage charging device according to claim 2, characterized in that, The AC-DC conversion circuit unit further includes: The sampling feedback module includes an optocoupler U3, a seventh resistor R24, an eighth resistor R25, a ninth resistor R34, a tenth resistor R35, and a first capacitor C14, a second capacitor C20, and a third capacitor C21. The PIN1 pin of the optocoupler U3 is connected to the positive terminal of the secondary side of the transformer T1. The PIN2 pin of the optocoupler U3 is connected to the output terminal of the secondary rectifier filter module through the eighth resistor R25. The PIN4 pin of the optocoupler U3 is connected to the PIN2-FB pin of the PWM control chip U1 through the seventh resistor R24. The first capacitor C14, the second capacitor C20, and the third capacitor C21 are connected in parallel in the feedback loop between the optocoupler U3 and the second protocol chip U4.

4. The energy storage charging device according to claim 1, characterized in that, The AC-DC conversion circuit unit further includes: The output overcurrent / short circuit protection module includes an eleventh resistor R22, which is connected in series to the negative output terminal of the secondary rectifier and filter module; and the two ends of the eleventh resistor R22 are respectively connected to the PIN8-IS+ pin and the PIN9-IS- pin of the second protocol chip U4.

5. The energy storage charging device according to claim 1, characterized in that, The energy storage battery control circuit unit includes an energy storage battery BAT; The positive terminal of the energy storage battery BAT is connected to the SW pin of the second protocol chip U4 through inductor L3 and the first energy storage capacitor C36, the second energy storage capacitor C37, and the third energy storage capacitor C38; the negative terminals of the first energy storage capacitor C36, the second energy storage capacitor C37, and the third energy storage capacitor C38 are grounded. The BVBUSC pin of the second protocol chip U4 is connected to the positive Vbus terminal of the Type-C interface unit, the BAT pin of the second protocol chip U4 is connected to the positive BAT terminal of the energy storage battery, and the VOUT pin of the second protocol chip U4 is connected to the positive Vbus terminal of the Type-C interface unit through the fourth energy storage capacitor C31, the fifth energy storage capacitor C32, and the sixth energy storage capacitor C33; the negative terminals of the fourth energy storage capacitor C31, the fifth energy storage capacitor C32, and the sixth energy storage capacitor C33 are grounded; the BAT pin is used to monitor the voltage of the energy storage battery BAT to confirm the remaining power.

6. The energy storage charging device according to claim 1, characterized in that, The energy storage battery control circuit unit also includes: The overcurrent-short circuit protection module includes a thirteenth resistor R40, which is connected in series between the VOUT pin of the second protocol chip U4 and the positive terminal of the Type-C interface unit Vbus; the two ends of the thirteenth resistor R40 are respectively connected to the VOUTSN and VOUTSP pins of the second protocol chip U4.

7. The energy storage charging device according to claim 1, characterized in that, The energy storage battery control circuit unit also includes: The over-temperature protection module includes a negative temperature coefficient thermistor RT4 and a fourteenth resistor R45; one end of the fourteenth resistor R45 is connected to the NTC pin of the second protocol chip U4, and the other end is connected to the negative temperature coefficient thermistor RT4; the negative temperature coefficient thermistor RT4 is grounded.

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