Charging voltage regulating circuit and mobile power supply

Abstract

The utility model discloses a charging voltage regulation circuit and a mobile power supply. The charging voltage regulation circuit comprises a charging interface module, an input rectification filtering module, a synchronous rectification module, an output filtering module, a protocol control module and a flyback control module. Wherein the protocol control module is electrically connected with the flyback control module and the charging interface module, the flyback control module is electrically connected with the input rectification filtering module and the synchronous rectification module, the synchronous rectification module is electrically connected with the output filtering module, and the output filtering module is electrically connected with the charging interface module. The synchronous rectification module is configured to adjust the input voltage input into the rectification filtering module, and the input voltage is output to the charging interface module through the output filtering module. According to the utility model, the drain-source voltage and switching loss of the synchronous rectification MOS can be reduced, and the stability and efficiency of the system are improved.

Description

Technical Field

[0001] This utility model relates to the field of charging circuit technology, and in particular to a charging voltage regulation circuit and a mobile power supply. Background Technology

[0002] In current market offerings that combine chargers and power banks, the charger module typically employs rapid switching to adjust the output voltage, such as direct jumps or short-term voltage boosts. While this allows for quick response to changes in voltage demand, the drain-source voltage of the MOSFET can easily exceed its safe operating range during the voltage switching process. This generates excessively high voltage spikes, increasing the risk of MOSFET breakdown and potentially leading to device instability and damage. Furthermore, the drain-source voltage spikes result in significant switching losses during the switching process, reducing power conversion efficiency and making it difficult for the device to maintain stable output performance under varying load conditions, thus impacting the user experience. Utility Model Content

[0003] The purpose of this invention is to solve at least one of the technical problems existing in the prior art, and to provide a charging voltage regulation circuit and a mobile power supply that can reduce the drain-source voltage and switching losses of the synchronous rectification MOS, and improve system stability and efficiency.

[0004] A charging voltage regulation circuit according to a first aspect of the present invention includes a charging interface module, an input rectification and filtering module, a synchronous rectification module, an output filtering module, a protocol control module, and a flyback control module. The protocol control module is electrically connected to both the flyback control module and the charging interface module. The flyback control module is electrically connected to both the input rectification and filtering module and the synchronous rectification module. The synchronous rectification module is electrically connected to the output filtering module. The output filtering module is electrically connected to the charging interface module. The synchronous rectification module is configured to adjust the input voltage of the input rectification and filtering module and output it to the charging interface module via the output filtering module.

[0005] The charging voltage regulation circuit provided according to the first aspect of the present invention has at least the following beneficial effects:

[0006] By coordinating with the protocol control module, flyback control module, and synchronous rectification module connected to the charging interface module, precise adjustment of the input voltage to the input rectification and filtering module is achieved. This not only reduces the drain-source voltage of the synchronous rectification MOSFET, avoiding the risk of overvoltage during voltage switching of the MOSFETs inside the synchronous rectification module, but also reduces switching losses, thus improving system stability and efficiency. Simultaneously, the cooperation between the synchronous rectification module and the output filtering module effectively reduces output voltage ripple and noise, ensuring output voltage stability and minimizing impact on the load equipment.

[0007] According to some embodiments of the present invention, the charging interface module includes at least one USB-C interface module configured with the PD protocol, the protocol control module includes a first chip, and the flyback control module includes a second chip. The first protocol communication interface of the first chip is connected to the second protocol communication interface of the USB-C interface module to receive a voltage demand signal, and the first configuration communication interface of the first chip is connected to the second configuration communication interface of the second chip to output a voltage adjustment signal.

[0008] According to some embodiments of this utility model, it further includes a transformer module, wherein the input rectifier filter module and the flyback control module are electrically connected to the primary side of the transformer module, and the synchronous rectifier module and the output filter module are electrically connected to the secondary side of the transformer module.

[0009] According to some embodiments of this utility model, the flyback control module further includes capacitors C33, C36, and C37, resistors R48, R62, and R65. The synchronous rectification module includes a drain interface D, a source interface S, and a gate interface G. Capacitor C37 is disposed between pin 1 of the second chip and the source interface S. Pin 2 of the second chip is connected to the source interface S. Capacitor C36 is disposed between pin 4 of the second chip and the source interface S. Pin 9 of the second chip is connected to the gate interface G. One end of resistor R48 is coupled to the connection point between pin 9 of the second chip and the gate interface G, and the other end is coupled to the connection point between capacitor C36 and the source interface S. Resistor R65 is disposed between pin 11 of the second chip and the drain interface D. Capacitor C33 and resistor R62 are disposed between the drain interface D and the source interface S. One end of capacitor C33 is connected to the drain interface D, and the other end is connected to one end of resistor R62. The other end of resistor R62 is coupled to the connection point between the source interface S and capacitor C37.

[0010] According to some embodiments of this utility model, the output filtering module includes a polarized capacitor EC5, a resistor RS1, an inductor LF1, an input terminal A, an input terminal B, and an output terminal VOUT. The input terminal A is connected to pin 2 of the inductor LF1, the input terminal B is connected to the drain interface D, the source interface S is connected to one end of the resistor RS1, and the other end is connected to pin 3 of the inductor LF1. The positive terminal of the polarized capacitor EC5 is coupled to the connection point between the input terminal A and pin 2 of the inductor LF1. Pin 1 of the inductor LF1 is connected to the output terminal VOUT. Pin 4 of the inductor LF1, the other end of the resistor RS1, and the negative terminal of the polarized capacitor EC5 are respectively grounded.

[0011] According to some embodiments of the present invention, the flyback control module further includes a capacitor C35 and a resistor R64. The pin 10 of the second chip is coupled to the connection point of the input terminal A and the pin 2 of the inductor LF1, and one end of the capacitor C35. The other end of the capacitor C35 is coupled to the connection point of the capacitor C37 and the source interface S. One end of the resistor R64 is coupled to the connection point of the pin 1 of the second chip and the capacitor C37, and the other end is coupled to one end of the resistor RS1 and the connection point of the pin 3 of the inductor LF1.

[0012] According to some embodiments of this utility model, an AC input module is also included. The AC input module is electrically connected to the input rectifier and filter module. The AC input module includes a live wire terminal L, a neutral wire terminal N, a fuse F1, an inductor LF2, a resistor NTC1, a capacitor CX1, resistors RX1, RX2, RX3, and RX4. One end of the fuse F1 is connected to the output terminal of the live wire terminal L, and the other end is connected to pin 2 of the inductor LF2. One end of the resistor NTC1 is connected to the output terminal of the neutral wire terminal N, and the other end is connected to the inductor L1. Pin 3 of F2 is connected. One end of capacitor CX1, one end of resistor RX1, and one end of resistor RX3 are respectively coupled to the connection point between the other end of fuse F1 and pin 2 of inductor LF2. The other end of capacitor CX1, one end of resistor RX2, and one end of resistor RX4 are respectively coupled to the connection point between the other end of resistor NTC1 and pin 3 of inductor LF2. The other ends of resistors RX1, RX2, RX3, and RX4 are interconnected.

[0013] According to some embodiments of this utility model, the input rectification and filtering module includes a rectifier bridge BD1, an inductor L4, a diode D4, capacitors EC1, EC2, EC3, EC8, and C1, and resistors R31, R21, R55, R56, R58, and R59. The transformer module includes an isolation transformer T1. Pin 1 of the inductor LF2 is connected to pin 2 of the rectifier bridge, and pin 4 of the inductor LF2 is connected to pin 1 of the rectifier bridge. Pin 3 of the rectifier bridge BD1 is connected to one end of capacitor EC1, one end of inductor L4, and one end of resistor R31. The other end of the inductor L4 is connected to the resistor R31. The other end of R31, one end of capacitor EC2, one end of capacitor EC3, and one end of capacitor EC8 are connected. Pin 4 of rectifier bridge BD1, the other end of capacitor EC1, and one end of resistor RZ1 are grounded. The other end of inductor L4 is connected to one end of capacitor C1, one end of resistor R55, one end of resistor R56, and pin 4 of isolation transformer T1. The other end of capacitor C1 is connected to the other end of resistor R55, the other end of resistor R56, one end of resistor R58, and one end of resistor R59. The other end of resistor R58 is connected to the other end of resistor R59 and the cathode of diode D4.

[0014] According to some embodiments of this utility model, the input rectification and filtering module further includes transistor Q5, diode ZD1, diode D3, capacitor C2, capacitor C38A, capacitor C39, capacitor C47, resistor R60, resistor R61, resistor R63, and resistor R70. Pin 17 of the second chip is connected to one end of capacitor C39 and one end of resistor R70, respectively. Pin 18 of the second chip is connected to the other end of capacitor C39, pin 19 of the second chip, one end of capacitor C38A, the anode of diode ZD1, the other end of resistor RZ1, the other end of capacitor EC2, the other end of capacitor EC3, and the other end of capacitor EC8, respectively. Pin 20 of the second chip is connected to the other end of capacitor C38A. The diode D4's anode and the isolation transformer T1's pin 3 are connected. The diode D1's cathode is connected to one end of the resistor R63 and the base of the transistor Q5. The transistor Q5's emitter is connected to the resistor R70. The transistor Q5's collector is connected to the other end of the resistor R63, one end of the resistor R60, and one end of the capacitor C47. The other end of the capacitor C47 is grounded to the isolation transformer T1's pin 1. The other end of the resistor R60 is connected to the diode D3's cathode and one end of the resistor R61. One end of the capacitor C2 is connected to the other end of the resistor R61. The other end of the capacitor C2 is connected to the diode D3's anode and the isolation transformer T1's pin 2.

[0015] A portable power bank according to a second aspect of the present invention includes a housing, a PCB circuit board, a battery, and a charging voltage regulation circuit as described in the first aspect. The charging voltage regulation circuit is disposed on the PCB circuit board, and both the PCB circuit board and the battery are disposed inside the housing.

[0016] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0017] The accompanying drawings are provided to further understand the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this utility model to explain the technical solution of this utility model, and do not constitute a limitation on the technical solution of this utility model.

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0019] Figure 1This is a functional block diagram of the charging voltage regulation circuit according to an embodiment of the present invention;

[0020] Figure 2 This is a functional block diagram of a charging voltage regulation circuit according to another embodiment of the present invention;

[0021] Figure 3 This is a circuit diagram of the charging voltage regulation circuit according to an embodiment of the present invention;

[0022] Figure 4 This is a circuit diagram of the protocol control module according to an embodiment of the present invention;

[0023] Figure 5 This is a circuit diagram of the charging interface module according to an embodiment of the present invention. Detailed Implementation

[0024] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0025] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0027] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0028] In current market offerings that combine chargers and power banks, the charger module typically employs rapid switching to adjust the output voltage, such as direct jumps or short-term voltage boosts. While this allows for quick response to changes in voltage demand, the drain-source voltage of the MOSFET can easily exceed its safe operating range during the voltage switching process. This generates excessively high voltage spikes, increasing the risk of MOSFET breakdown and potentially leading to device instability and damage. Furthermore, the drain-source voltage spikes result in significant switching losses during the switching process, reducing power conversion efficiency and making it difficult for the device to maintain stable output performance under varying load conditions, thus impacting the user experience.

[0029] Based on this, the present invention provides a charging voltage regulation circuit and a mobile power supply, which can reduce the drain-source voltage and switching losses of the synchronous rectification MOS, thereby improving system stability and efficiency.

[0030] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0031] Reference Figure 1 A first aspect of the present invention provides a charging voltage regulation circuit, including a charging interface module, an input rectification and filtering module, a synchronous rectification module, an output filtering module, a protocol control module, and a flyback control module; wherein the protocol control module is electrically connected to the flyback control module and the charging interface module respectively, the flyback control module is electrically connected to the input rectification and filtering module and the synchronous rectification module respectively, the synchronous rectification module is electrically connected to the output filtering module, the output filtering module is electrically connected to the charging interface module, and the synchronous rectification module is configured to regulate the input voltage of the input rectification and filtering module and output it to the charging interface module through the output filtering module.

[0032] Understandably, the charging interface module provides a physical connection interface, such as USB-C, for connecting external load devices. It is also electrically connected to the protocol control module, transmitting the power delivery protocol from the load device to the protocol control module for processing. This allows for the management and negotiation of requested power voltages. The power delivery protocol may include protocols such as USB PD. Furthermore, the protocol control module works in conjunction with the flyback control module to adjust the output voltage according to the load device's requirements. The flyback control module is also electrically connected to the input rectifier and filter module to obtain a stable DC input and control the operation of the synchronous rectification module. For example, based on the voltage parameters preset by the power delivery protocol, it controls the switching action of the MOSFETs inside the synchronous rectification module, thereby controlling the switching frequency and duty cycle of the MOSFETs to regulate the output voltage.

[0033] According to the charging voltage regulation circuit provided by this utility model, the protocol control module, flyback control module, and synchronous rectification module connected to the charging interface module work together to achieve precise adjustment of the input voltage of the input rectification and filtering module. This not only reduces the drain-source voltage of the MOSFET inside the synchronous rectification module, avoiding the risk of overvoltage during voltage switching, but also reduces switching losses, which is beneficial to improving system stability and efficiency. Simultaneously, the cooperation between the synchronous rectification module and the output filtering module effectively reduces output voltage ripple and noise, ensuring output voltage stability and minimizing the impact on the load equipment.

[0034] Reference Figures 3 to 5 In the charging voltage regulation circuit provided in some embodiments of this utility model, the charging interface module includes at least one USB-C interface module configured with PD protocol, the protocol control module includes a first chip, and the flyback control module includes a second chip. The first protocol communication interface of the first chip is connected to the second protocol communication interface of the USB-C interface module to receive voltage demand signal, and the first configuration communication interface of the first chip is connected to the second configuration communication interface of the second chip to output voltage regulation signal.

[0035] Understandably, the charging interface module includes a USB-C interface module supporting the PD (Power Delivery) protocol for connecting external load devices and transmitting power protocols. The main control chip of the protocol control module can be a first chip. The first chip communicates with the second protocol communication interface of the USB-C interface module through a first protocol communication interface, receiving voltage demand signals, i.e., signals from the load device requesting a specific voltage. Through rapid negotiation and adjustment using the PD protocol, it ensures that the device receives the required voltage, improving charging efficiency. Furthermore, the main control chip of the flyback control module can be a second chip. The first chip communicates with the second chip through a first configuration communication interface, adjusting the output voltage according to the received voltage adjustment signal to ensure that the load device receives the required voltage.

[0036] In some embodiments, the first chip is model IP5389H, and the second chip is model INN4575F. Specifically, the IP5389H integrates USB-C Power Delivery PD2.0 / PD3.0 / PPS protocols, supporting PD2.0 / PD3.0 bidirectional input / output protocols and PPS output protocols. It also supports a maximum power output of 100W, with input voltage levels of 5V, 9V, 12V, 15V, and 20V, and output voltage levels of 5V, 9V, 12V, 15V, and 20V. It should be noted that, as... Figures 3 to 5As shown, the first protocol communication interface is pins 54 and 51 of the first chip, the second protocol communication interface is pins A5 and B5 of the USB-C interface module, the first configuration communication interface is pins 60 and 61 of the first chip, and the second configuration communication interface is pins 6 and 5 of the second chip.

[0037] In some embodiments, the IP5389H configures the registers of the INN4575F via a voltage regulation signal. When the USB-C interface module is connected to the load device, the INN4575F controls the switching frequency and duty cycle of the MOSFETs inside the synchronous rectification module according to the configured parameters, thereby regulating the output voltage. When the USB-C interface module is powered on with the load device, the default output voltage is 5V. The output voltage can be boosted from 5V to 20V in stages using the first and second chips. That is, the boosting process can be divided into multiple stages, such as the first stage from 5V to 9V, the second stage from 9V to 12V, the third stage from 12V to 15V, and the fourth stage from 15V to 20V. Taking the first stage as an example, when the voltage demand signal received by the first chip is 9V, it indicates that the output voltage needs to be boosted to 9V. The first chip configures the voltage adjustment signal and sends it to the second chip. The voltage adjustment signal can be a register configuration signal to configure the voltage control register inside the second chip through IIC communication. For example, it can be configured every 10ms, increasing the output voltage by 1V each time, that is, adjusting the output voltage in a voltage step of 1V / 10ms. Alternatively, the time interval for each configuration can be set to 20ms, 30ms, etc., and the voltage increase for each configuration can be set to 2V, 3V, etc. The specific value of the voltage step can be set according to the actual needs of the user. This embodiment of the utility model does not limit this.

[0038] Reference Figure 2 In some embodiments of the present invention, the charging voltage regulation circuit further includes a transformer module, an input rectifier filter module and a flyback control module electrically connected to the primary side of the transformer module, and a synchronous rectifier module and an output filter module electrically connected to the secondary side of the transformer module. It can be understood that when the second chip receives the voltage regulation signal, it controls the switching frequency (f) and duty cycle (D) of the MOS transistor inside the synchronous rectifier module, thereby regulating the output voltage.

[0039] In some embodiments, the relationship between the on-state duty cycle (D) and the output voltage is as follows:

[0040]

[0041] Where D is the duty cycle, V o The output voltage of the USB-C interface module is V, where N is the primary turns ratio of the transformer module. inThis is the voltage after passing through the input rectifier and filter module.

[0042] In some embodiments, the relationship between the switching frequency (f) and the output power is as follows:

[0043]

[0044] Among them, P o For the output power of the USB-C interface module, L p I is the primary inductance of the transformer module. p is the peak current on the primary side of the transformer module, and f is the switching frequency.

[0045] Reference Figure 3 In the charging voltage regulation circuit provided in some embodiments of this utility model, the flyback control module further includes capacitors C33, C36, and C37, resistors R48, R62, and R65. The synchronous rectification module includes a drain interface D, a source interface S, and a gate interface G. A capacitor C37 is disposed between pin 1 of the second chip and the source interface S. Pin 2 of the second chip is connected to the source interface S. A capacitor C36 is disposed between pin 4 of the second chip and the source interface S. Pin 9 of the second chip is connected to the gate interface G. The gate interface G is connected, one end of resistor R48 is coupled to the connection point between pin 9 of the second chip and the gate interface G, and the other end is coupled to the connection point between capacitor C36 and the source interface S. Resistor R65 is set between pin 11 of the second chip and the drain interface D. Capacitor C33 and resistor R62 are set between the drain interface D and the source interface S. One end of capacitor C33 is connected to the drain interface D, and the other end is connected to one end of resistor R62. The other end of resistor R62 is coupled to the connection point between the source interface S and capacitor C37.

[0046] Reference Figure 3 In the charging voltage regulation circuit provided in some embodiments of this utility model, the output filter module includes a polarized capacitor EC5, a resistor RS1, an inductor LF1, an input terminal A, an input terminal B, and an output terminal VOUT. Input terminal A is connected to pin 2 of inductor LF1, input terminal B is connected to the drain interface D, the source interface S is connected to one end of resistor RS1, and the other end is connected to pin 3 of inductor LF1. The positive terminal of polarized capacitor EC5 is coupled to the connection point between input terminal A and pin 2 of inductor LF1. Pin 1 of inductor LF1 is connected to the output terminal VOUT. Pin 4 of inductor LF1, the other end of resistor RS1, and the negative terminal of polarized capacitor EC5 are respectively grounded.

[0047] Reference Figure 3In the charging voltage regulation circuit provided in some embodiments of this utility model, the flyback control module further includes a capacitor C35 and a resistor R64. The pin 10 of the second chip is coupled to the connection point of the input terminal A and the pin 2 of the inductor LF1, and one end of the capacitor C35. The other end of the capacitor C35 is coupled to the connection point of the capacitor C37 and the source interface S. One end of the resistor R64 is coupled to the connection point of the pin 1 of the second chip and the capacitor C37, and the other end is coupled to one end of the resistor RS1 and the connection point of the pin 3 of the inductor LF1.

[0048] Reference Figure 3 In some embodiments of the present invention, the charging voltage regulation circuit further includes an AC input module. The AC input module is electrically connected to the input rectifier and filter module. The AC input module includes a live wire terminal L, a neutral wire terminal N, a fuse F1, an inductor LF2, a resistor NTC1, a capacitor CX1, a resistor RX1, a resistor RX2, a resistor RX3, and a resistor RX4. One end of the fuse F is connected to the output terminal of the live wire terminal L, and the other end is connected to pin 2 of the inductor LF2. One end of the resistor NTC1 is connected to the output terminal of the neutral wire terminal N, and the other end is connected to pin 3 of the inductor LF2. One end of the capacitor CX1, one end of the resistor RX1, and one end of the resistor RX3 are respectively coupled to the connection point between the other end of the fuse F1 and pin 2 of the inductor LF2. The other end of the capacitor CX1, one end of the resistor RX2, and one end of the resistor RX4 are respectively coupled to the connection point between the other end of the resistor NTC1 and pin 3 of the inductor LF2. The other ends of the resistors RX1, RX2, RX3, and RX4 are interconnected.

[0049] Reference Figure 3In some embodiments of the charging voltage regulation circuit provided by this utility model, the input rectification and filtering module includes a rectifier bridge BD1, an inductor L4, a diode D4, capacitors EC1, EC2, EC3, EC8, and C1, resistors R31, RZ1, R55, R56, R58, and R59. The transformer module includes an isolation transformer T1. Pin 1 of inductor LF2 is connected to pin 2 of the rectifier bridge, pin 4 of inductor LF2 is connected to pin 1 of the rectifier bridge, and pin 3 of rectifier bridge BD1 is connected to one end of capacitor EC1, one end of inductor L4, and one end of resistor R31, respectively. The other end of inductor L4 is connected to the other end of resistor R31, one end of capacitor EC2, one end of capacitor EC3, and one end of capacitor EC8. Pin 4 of rectifier bridge BD1, the other end of capacitor EC1, and one end of resistor RZ1 are grounded. The other end of inductor L4 is connected to one end of capacitor C1, one end of resistor R55, one end of resistor R56, and pin 4 of isolation transformer T1. The other end of capacitor C1 is connected to the other end of resistor R55, one end of resistor R56, one end of resistor R58, and one end of resistor R59. The other end of resistor R58 is connected to the other end of resistor R59 and the cathode of diode D4.

[0050] Reference Figure 3 In some embodiments of the charging voltage regulation circuit provided by this utility model, the input rectification and filtering module further includes transistor Q5, diode ZD1, diode D3, capacitor C2, capacitor C38A, capacitor C39, capacitor C47, resistor R60, resistor R61, resistor R63, and resistor R70. Pin 17 of the second chip is connected to one end of capacitor C39 and one end of resistor R70, respectively. Pin 18 of the second chip is connected to the other end of capacitor C39, pin 19 of the second chip, one end of capacitor C38A, the anode of diode ZD1, the other end of resistor RZ1, the other end of capacitor EC2, the other end of capacitor EC3, and the other end of capacitor EC8, respectively. Pin 20 of the second chip... The diodes are connected to the other end of capacitor C38A, the anode of diode D4, and pin 3 of isolation transformer T1, respectively. The cathode of diode ZD1 is connected to one end of resistor R63 and the base of transistor Q5, respectively. The emitter of transistor Q5 is connected to resistor R70, and the collector of transistor Q5 is connected to the other end of resistor R63, one end of resistor R60, and one end of capacitor C47, respectively. The other end of capacitor C47 is grounded to pin 1 of isolation transformer T1, and the other end of resistor R60 is connected to the cathode of diode D3 and one end of resistor R61, respectively. One end of capacitor C2 is connected to the other end of resistor R61, and the other end of capacitor C2 is connected to the anode of diode D3 and pin 2 of isolation transformer T1, respectively.

[0051] The second aspect of this utility model provides a mobile power supply, including a housing, a PCB circuit board, a battery, and a charging voltage regulation circuit as described in the first aspect. The charging voltage regulation circuit is disposed on the PCB circuit board, and both the PCB circuit board and the battery are disposed inside the housing.

[0052] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A charging voltage regulation circuit, characterized in that, The system includes a charging interface module, an input rectification and filtering module, a synchronous rectification module, an output filtering module, a protocol control module, and a flyback control module. The protocol control module is electrically connected to both the flyback control module and the charging interface module. The flyback control module is electrically connected to both the input rectification and filtering module and the synchronous rectification module. The synchronous rectification module is electrically connected to the output filtering module. The output filtering module is also electrically connected to the charging interface module. The synchronous rectification module is configured to adjust the input voltage of the input rectification and filtering module and output it to the charging interface module via the output filtering module.

2. The charging voltage regulation circuit according to claim 1, characterized in that, The charging interface module includes at least one USB-C interface module configured with the PD protocol. The protocol control module includes a first chip, and the flyback control module includes a second chip. The first protocol communication interface of the first chip is connected to the second protocol communication interface of the USB-C interface module to receive a voltage demand signal. The first configuration communication interface of the first chip is connected to the second configuration communication interface of the second chip to output a voltage adjustment signal.

3. The charging voltage regulation circuit according to claim 2, characterized in that, It also includes a transformer module, wherein the input rectifier and filter module and the flyback control module are electrically connected to the primary side of the transformer module, and the synchronous rectifier module and the output filter module are electrically connected to the secondary side of the transformer module.

4. The charging voltage regulation circuit according to claim 3, characterized in that, The flyback control module further includes capacitors (C33), (C36), (C37), resistors (R48), (R62), and (R65). The synchronous rectification module includes a drain interface (D), a source interface (S), and a gate interface (G). The capacitor (C37) is disposed between pin (1) of the second chip and the source interface (S). Pin (2) of the second chip is connected to the source interface (S). The capacitor (C36) is disposed between pin (4) of the second chip and the source interface (S). Pin (9) of the second chip is connected to the gate interface (G). The resistor (R48)... One end of the capacitor (C36) is coupled to the connection point between the pin (9) of the second chip and the gate interface (G), and the other end is coupled to the connection point between the capacitor (C36) and the source interface (S). The resistor (R65) is located between the pin (11) of the second chip and the drain interface (D). The capacitor (C33) and the resistor (R62) are located between the drain interface (D) and the source interface (S). One end of the capacitor (C33) is connected to the drain interface (D), and the other end is connected to one end of the resistor (R62). The other end of the resistor (R62) is coupled to the connection point between the source interface (S) and the capacitor (C37).

5. The charging voltage regulation circuit according to claim 4, characterized in that, The output filtering module includes a polarized capacitor (EC5), a resistor (RS1), an inductor (LF1), an input terminal (A), an input terminal (B), and an output terminal (VOUT). The input terminal (A) is connected to the pin (2) of the inductor (LF1), the input terminal (B) is connected to the drain interface (D), the source interface (S) is connected to one end of the resistor (RS1), and the other end is connected to the pin (3) of the inductor (LF1). The positive terminal of the polarized capacitor (EC5) is coupled to the connection point between the input terminal (A) and the pin (2) of the inductor (LF1). The pin (1) of the inductor (LF1) is connected to the output terminal (VOUT). The pin (4) of the inductor (LF1), the other end of the resistor (RS1), and the negative terminal of the polarized capacitor (EC5) are grounded respectively.

6. The charging voltage regulation circuit according to claim 5, characterized in that, The flyback control module also includes a capacitor (C35) and a resistor (R64). The pin (10) of the second chip is coupled to the connection point of the input terminal (A) and the pin (2) of the inductor (LF1) and one end of the capacitor (C35). The other end of the capacitor (C35) is coupled to the connection point of the capacitor (C37) and the source interface (S). One end of the resistor (R64) is coupled to the connection point of the pin (1) of the second chip and the capacitor (C37), and the other end is coupled to the connection point of one end of the resistor (RS1) and the pin (3) of the inductor (LF1).

7. The charging voltage regulation circuit according to claim 6, characterized in that, It also includes an AC input module, which is electrically connected to the input rectifier and filter module. The AC input module includes a live wire terminal (L), a neutral wire terminal (N), a fuse (F1), an inductor (LF2), a resistor (NTC1), a capacitor (CX1), a resistor (RX1), a resistor (RX2), a resistor (RX3), and a resistor (RX4). One end of the fuse (F) is connected to the output terminal of the live wire terminal (L), and the other end is connected to pin (2) of the inductor (LF2). One end of the resistor (NTC1) is connected to the output terminal of the neutral wire terminal (N), and the other end is connected to pin (2) of the inductor (LF2). 3) Connection: One end of the capacitor (CX1), one end of the resistor (RX1), and one end of the resistor (RX3) are respectively coupled to the connection point between the other end of the fuse (F1) and the pin (2) of the inductor (LF2). The other end of the capacitor (CX1), one end of the resistor (RX2), and one end of the resistor (RX4) are respectively coupled to the connection point between the other end of the resistor (NTC1) and the pin 3 of the inductor (LF2). The other ends of the resistors (RX1), (RX2), (RX3), and (RX4) are connected to each other.

8. The charging voltage regulation circuit according to claim 7, characterized in that, The input rectifier and filter module includes a rectifier bridge (BD1), an inductor (L4), a diode (D4), a capacitor (EC1), a capacitor (EC2), a capacitor (EC3), a capacitor (EC8), a capacitor (C1), a resistor (R31), a resistor (RZ1), a resistor (R55), a resistor (R56), a resistor (R58), and a resistor (R59). The transformer module includes an isolation transformer (T1). The pin (1) of the inductor (LF2) is connected to the pin (2) of the rectifier bridge. The pin (4) of the inductor (LF2) is connected to the pin (1) of the rectifier bridge. The pin (3) of the rectifier bridge (BD1) is connected to one end of the capacitor (EC1), one end of the inductor (L4), and one end of the resistor (R31). The other end of the inductor (L4) is connected to the resistor (R31). The other end of 31), one end of the capacitor (EC2), one end of the capacitor (EC3) and one end of the capacitor (EC8) are connected. The pin (4) of the rectifier bridge (BD1), the other end of the capacitor (EC1) and one end of the resistor (RZ1) are grounded. The other end of the inductor (L4) is connected to one end of the capacitor (C1), one end of the resistor (R55), one end of the resistor (R56) and the pin (4) of the isolation transformer (T1) respectively. The other end of the capacitor (C1) is connected to the other end of the resistor (R55), the other end of the resistor (R56), one end of the resistor (R58) and one end of the resistor (R59) respectively. The other end of the resistor (R58) is connected to the other end of the resistor (R59) and the cathode of the diode (D4) respectively.

9. The charging voltage regulation circuit according to claim 8, characterized in that, The input rectification and filtering module further includes a transistor (Q5), a diode (ZD1), a diode (D3), a capacitor (C2), a capacitor (C38A), a capacitor (C39), a capacitor (C47), a resistor (R60), a resistor (R61), a resistor (R63), and a resistor (R70). The pin (17) of the second chip is connected to one end of the capacitor (C39) and one end of the resistor (R70), respectively. The pin (18) of the second chip is connected to the other end of the capacitor (C39), the pin (19) of the second chip, one end of the capacitor (C38A), the anode of the diode (ZD1), the other end of the resistor (RZ1), the other end of the capacitor (EC2), the other end of the capacitor (EC3), and the other end of the capacitor (EC8), respectively. The pin (20) of the second chip is connected to the other end of the capacitor (C38A), the diode... The anode of the diode (D4) is connected to the pin (3) of the isolation transformer (T1). The cathode of the diode (ZD1) is connected to one end of the resistor (R63) and the base of the transistor (Q5). The emitter of the transistor (Q5) is connected to the resistor (R70). The collector of the transistor (Q5) is connected to the other end of the resistor (R63), one end of the resistor (R60), and one end of the capacitor (C47). The other end of the capacitor (C47) is grounded to the pin (1) of the isolation transformer (T1). The other end of the resistor (R60) is connected to the cathode of the diode (D3) and one end of the resistor (R61). One end of the capacitor (C2) is connected to the other end of the resistor (R61). The other end of the capacitor (C2) is connected to the anode of the diode (D3) and the pin (2) of the isolation transformer (T1).

10. A portable power bank, characterized in that, The device includes a housing, a PCB circuit board, a battery, and a charging voltage regulation circuit as described in any one of claims 1 to 9, wherein the charging voltage regulation circuit is disposed on the PCB circuit board, and both the PCB circuit board and the battery are disposed inside the housing.

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