CN115021382A

CN115021382A - USB power management system and charging cabinet

Info

Publication number: CN115021382A
Application number: CN202210719674.1A
Authority: CN
Inventors: 魏庆东
Original assignee: Suzhou Baidejia Electronic Technology Co ltd
Current assignee: Suzhou Baidejia Electronic Technology Co ltd
Priority date: 2022-06-23
Filing date: 2022-06-23
Publication date: 2022-09-06

Abstract

The invention discloses a USB power management system and a charging cabinet, belonging to the technical field of charging cabinets, wherein the USB power management system comprises: the switching power supply module is used for converting mains supply voltage into power supply voltage with different voltage values; the charging control modules are connected with the switching power supply modules in a one-to-one correspondence mode and used for providing power supply voltage for different devices to be charged through USB interfaces; the charging control module comprises a plurality of charging control modules, and the plurality of charging control modules are connected with the switching power supply module; the charging cabinet comprises a body and the USB power management system. The invention solves the problem of potential power utilization potential safety hazards in the existing USB power supply management, realizes the separated management of high voltage and low voltage, and achieves the effect of reducing the potential power utilization potential safety hazards.

Description

USB power management system and charging cabinet

Technical Field

The invention relates to the technical field of charging cabinets, in particular to a USB power management system and a charging cabinet.

Background

In the related art, the USB (Universal Serial Bus) power management can be used to activate, suspend, idle, sleep, and the like the USB device, reduce the invalid power consumption, and implement the effective use and reasonable distribution of the system power. With the increasing scenes of centralized charging management of digital products, centralized charging equipment such as a charging cabinet is available.

Most of the existing charging cabinets are charged by adopting a scheme that a 220V socket is matched with a power adapter special for USB equipment. The problem that exists in this kind of charging scheme is that the user needs to connect power adapter and socket, can directly contact with 220V voltage region, has potential power consumption potential safety hazard.

Disclosure of Invention

The main purposes of the invention are as follows: the utility model provides a USB power management system and cabinet that charges, aim at solving among the prior art USB power management and have the technical problem of potential power consumption potential safety hazard.

In order to achieve the purpose, the invention adopts the following technical scheme:

in a first aspect, the present invention provides a USB power management system, including:

the switching power supply module is used for converting mains voltage into power supply voltages with different voltage values;

the charging control modules are connected with the switching power supply modules in a one-to-one correspondence mode and used for providing the power supply voltage for different devices to be charged through USB interfaces;

the charging control module comprises a plurality of charging control modules, and the plurality of charging control modules are connected with the switching power supply module.

Optionally, in the USB power management system, the system further includes:

and the socket module is respectively connected with the mains supply interface and the at least one switching power supply module and is used for being plugged with the mains supply interface and receiving the mains supply voltage.

Optionally, in the USB power management system, the receptacle module includes:

the input socket is connected with the commercial power interface and is used for plugging the commercial power interface;

the leakage protector is connected with the input socket and is used for providing leakage protection when receiving the mains supply voltage;

and the air switch is respectively connected with the leakage protector and the at least one switching power supply module and is used for controlling the on-off of the mains supply voltage input to the switching power supply module.

Optionally, in the USB power management system, the system further includes:

the extended function module is connected with the switching power supply module and used for providing the power supply voltage for external equipment to enable the external equipment to work, wherein the external equipment is connected with equipment where the USB power supply management system is located;

and/or the presence of a gas in the gas,

and the power supply output module is connected with the switching power supply module and used for providing the power supply voltage for an external system to enable the external system to work, wherein the external system is a system which is arranged in the equipment where the USB power supply management system is and is connected with the USB power supply management system.

Optionally, in the USB power management system, the switching power supply module includes:

the first rectification filter circuit is used for filtering and rectifying the mains supply voltage to obtain direct-current pulsating high voltage;

the inverter control circuit is used for generating an initial control signal according to a preset period;

the high-voltage inverter circuit is respectively connected with the inverter control circuit and the first rectifying and filtering circuit and is used for carrying out inversion processing on the direct-current pulsating high voltage according to the initial control signal to obtain high-frequency alternating square wave voltage with adjustable duty ratio;

the voltage conversion circuit is connected with the high-voltage inverter circuit and used for converting the high-frequency alternating square wave voltage into a target high-frequency alternating square wave voltage;

and the second rectification filter circuit is respectively connected with the voltage conversion circuit and the charging control module and is used for rectifying and filtering the target high-frequency alternating square wave voltage to obtain a power supply voltage and outputting the power supply voltage.

Optionally, in the USB power management system, the high-voltage inverter circuit includes:

the signal enhancement unit is connected with the inverter control circuit and used for enhancing the initial control signal to obtain a target control signal;

and the first switch unit is respectively connected with the signal enhancement unit and the voltage conversion circuit and used for conducting according to the target control signal and carrying out inversion processing on the direct current pulsating high voltage to obtain the high-frequency alternating square wave voltage.

Optionally, in the USB power management system, the inverter control circuit includes:

the voltage sampling unit is connected with the second rectifying and filtering circuit and is used for sampling the power supply voltage;

the pulse control unit is connected with the voltage sampling unit and used for generating a driving signal according to the power supply voltage and a preset period and outputting the driving signal;

and the second switch unit is respectively connected with the pulse control unit and the signal enhancement unit and used for generating the initial control signal according to the driving signal and outputting the initial control signal to the signal enhancement unit.

Optionally, in the USB power management system, the switching power supply module further includes:

the over-temperature protection circuit is connected with the inverter control circuit and used for disconnecting a working power supply of the inverter control circuit when the temperature is overhigh so as to stop the inverter control circuit;

the overvoltage protection circuit is respectively connected with the second rectifying and filtering circuit and the inversion control circuit and is used for generating an overvoltage detection signal when the power supply voltage is overhigh and inputting the overvoltage detection signal to the inversion control circuit, so that the inversion control circuit adjusts the duty ratio of the initial control signal according to the overvoltage detection signal and stops the high-voltage inversion circuit from working;

and the overload protection circuit is respectively connected with the second rectifying and filtering circuit and the inversion control circuit and is used for sampling the feedback current of the power supply voltage, generating an overcurrent detection signal and inputting the overcurrent detection signal to the inversion control circuit, so that the inversion control circuit adjusts the duty ratio of the initial control signal according to the overcurrent detection signal and stops the high-voltage inversion circuit from working.

Optionally, in the USB power management system, the charging control module includes:

the USB switching circuit is connected with the switching power supply module and the USB interface and is used for controlling the switching state of the power supply voltage output by the USB interface;

and the state display circuit is connected with the USB switch circuit and is used for detecting the switch state and displaying the state.

In a second aspect, the present invention further provides a charging cabinet, including:

the USB power management system comprises a body and the USB power management system;

the USB power management system is arranged in the body.

One or more technical solutions provided by the present invention may have the following advantages or at least achieve the following technical effects:

according to the USB power management system and the charging cabinet provided by the invention, the switch power module is connected with the charging control module, the mains supply voltage is converted into the power supply voltages with different voltage values, and then the power supply voltages are supplied to different devices to be charged through the USB interface, so that the devices to be charged are isolated from the mains supply, the high-low voltage separation management is realized, and a user directly contacts with the charging control module which supplies the low-voltage direct-current power supply voltage without contacting with the mains supply interface, namely without contacting with a 220V voltage area, so that the potential safety hazard of power utilization is reduced; according to the invention, through the system layout of the plurality of switching power supply modules and the plurality of charging control modules, the equipment to be charged in different types can be directly connected, and various independent adapters do not need to be additionally arranged for the equipment to be charged, so that the resource utilization efficiency is improved, the utilization rate of the internal space of the charging cabinet is improved, and the universality is better; according to the invention, the plurality of charging control modules are distributed in each charging control module, so that different numbers of USB interfaces can be configured according to different application scenes, the actual requirements of the application scenes are ensured while resource waste is prevented, and the charging control module has better applicability and practicability.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a connection diagram of a USB power management system according to a first embodiment of the present invention;

FIG. 2 is a connection diagram of a USB power management system according to a second embodiment of the present invention;

FIG. 3 is a schematic connection diagram of a switching power supply module in a second embodiment of the USB power management system according to the present invention;

FIG. 4 is a detailed connection diagram of a switch power module in a second embodiment of the USB power management system according to the present invention;

FIG. 5 is another schematic connection diagram of a switching power module in a second embodiment of a USB power management system according to the present invention;

FIG. 6 is a schematic circuit diagram of a first rectifying and filtering circuit in a second embodiment of the USB power management system according to the present invention;

FIG. 7 is a schematic circuit diagram of a high voltage inverter circuit in a second embodiment of the USB power management system of the present invention;

FIG. 8 is a schematic circuit diagram of a voltage converting circuit and a second rectifying and filtering circuit in a second embodiment of the USB power management system according to the present invention;

FIG. 9 is a schematic circuit diagram of an inverter control circuit in a second embodiment of the USB power management system of the present invention;

FIG. 10 is a schematic circuit diagram of the various interfaces involved in the switching power supply module of the second embodiment of the USB power management system of the present invention;

FIG. 11 is a schematic connection diagram of a charging control module in a second embodiment of the USB power management system of the present invention;

FIG. 12 is a schematic circuit diagram of a USB switch circuit in a second embodiment of the USB power management system of the present invention;

FIG. 13 is a schematic circuit diagram of a status display circuit in a second embodiment of the USB power management system of the present invention;

FIG. 14 is a connection diagram of a USB power management system according to a third embodiment of the present invention.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is to be noted that, in the present invention, the terms "comprises", "comprising" or any other variation thereof are intended to cover a non-exclusive inclusion, such that an apparatus or system including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such apparatus or system. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a device or system that comprises the element. In the present invention, unless expressly stated or limited otherwise, the terms "connected," "secured," and the like are to be construed broadly, and for example, "connected" may be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; either internally or in interactive relation. In the present invention, if there is a description referring to "first", "second", etc., the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicit indication of the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the present invention, suffixes such as "module", "part", or "unit" used to represent elements are used only for facilitating the description of the present invention, and have no specific meaning in themselves. Thus, "module", "component" or "unit" may be used mixedly.

The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. In addition, the technical solutions of the respective embodiments may be combined with each other, but must be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should be considered to be absent and not be within the protection scope of the present invention.

The prior art is analyzed and found that the scheme that a 220V socket is matched with a power adapter special for a USB device is mostly adopted in the existing charging cabinet for charging. The problem that exists in this kind of charging scheme is that the user needs to connect power adapter and socket, can directly contact with 220V voltage region, has potential power consumption potential safety hazard. Moreover, different USB devices need to be arranged with different power adapters, which is inconvenient for the number expansion of the charging devices, and the wiring is disordered and safety accidents are easily caused in the use scene of simultaneously charging a plurality of devices.

In view of the technical problems of potential safety hazards of power utilization, difficulty in quantity expansion and easiness in causing safety accidents in USB power management in the prior art, the invention provides a USB power management system and a charging cabinet, and the specific embodiment and implementation mode are as follows:

example one

Referring to fig. 1, fig. 1 is a connection diagram of a USB power management system according to a first embodiment of the present invention; the embodiment provides a USB power management system. The USB power management system may include:

the charging control module is connected with the at least one switching power supply module in a one-to-one correspondence manner and used for providing the power supply voltage to different devices to be charged through a USB interface;

Specifically, at least one switching power supply module is connected in parallel through a bus. The USB interface can directly charge various digital products, namely different devices to be charged.

Compared with the mode that a user directly contacts with a mains supply interface such as a socket and the like to plug in an adapter plug of a device to be charged in the prior art, the mode that the user directly contacts with the mains supply interface to plug in the adapter plug of the device to be charged in the embodiment has the advantages that the user directly contacts with the USB interface outputting low-voltage direct-current supply voltage to directly plug in the plug of the device to be charged, the user can not contact with a high-voltage part any more, particularly the part of the mains supply interface, high-voltage and low-voltage separation is realized, and therefore the probability of potential safety hazards is reduced.

A plurality of control module that charges constitute an independent control module that charges, and the USB interface quantity that single control module that charges corresponds can be inconsistent with the quantity of control module that charges, for example, a control module that charges can connect a plurality of USB interfaces, and specific quantity can freely be configured according to the application scene of difference to satisfy the different demands to USB interface quantity under the different use scenes. Meanwhile, superposition of a plurality of charging control modules can be achieved, correspondingly, each charging control module is provided with one switching power supply module, namely the charging control modules are connected with the charging control modules in a one-to-one correspondence manner, and the requirement for explaining can be met, and the power supply voltages output by the charging control modules can be different voltage values so as to meet different requirements for output voltage values under different use scenes.

According to the USB power management system, the switch power module is connected with the charging control module, mains supply voltage is converted into power supply voltages with different voltage values, the power supply voltages are provided for different devices to be charged through the USB interface, the devices to be charged are isolated from the mains supply, high-low voltage separation management is achieved, a user directly contacts with the charging control module providing low-voltage direct-current power supply voltage without contacting with the mains supply interface, namely, the user does not need to contact with a 220V voltage area, and therefore potential electricity utilization potential safety hazards are reduced; according to the invention, through the system layout of the plurality of switching power supply modules and the plurality of charging control modules, the equipment to be charged in different types can be directly connected, and various independent adapters do not need to be additionally arranged for the equipment to be charged, so that the resource utilization efficiency is improved, the utilization rate of the internal space of the charging cabinet is improved, and the universality is better; according to the invention, the plurality of charging control modules are distributed in each charging control module, so that different numbers of USB interfaces can be configured according to different application scenes, the actual requirements of the application scenes are ensured while resource waste is prevented, and the charging control module has better applicability and practicability.

Example two

Referring to fig. 2, fig. 2 is a connection diagram of a USB power management system according to a second embodiment of the present invention; on the basis of the first embodiment, the present embodiment provides a USB power management system.

Further, as shown in the connection diagram of fig. 2, the system may further include:

The socket module can be connected on same bus with switching power supply module jointly, realizes being connected between socket module and a plurality of switching power supply module, forwards mains voltage to a plurality of switching power supply modules.

The system can be directly connected with a mains supply power grid, the charging cabinet where the system is located is fixed at a certain position, the charging cabinet can also be connected through the socket module, the charging cabinet is conveniently arranged at any place with a mains supply interface through the socket module and the mains supply power grid, mains supply voltage is received through the mode that the socket module is connected with the mains supply interface, and the mobility of the charging cabinet where the USB power management system is located is realized.

Still further, the jack module may include:

The input socket can adopt a three-wire socket, an appliance input socket with a seesaw switch and the like and is used for receiving the mains supply voltage of 220V alternating current, and when abnormal conditions such as short circuit, electric leakage and the like exist between the input socket and the bus connection of the switching power supply module, the connection between the switching power supply module and the socket module is disconnected by the electric leakage protector, so that electric leakage protection is provided; the air switch is a low-voltage air breaker, and can directly control the on-off of the mains voltage input to the switch power supply module. The current scheme that adopts the rocker switch, in the use, if the electric current is great, produce electric arc and spark easily, adopt air switch here, compare the current scheme that adopts ordinary rocker switch, can avoid producing the potential risk of electric arc and spark. Optionally, the socket module may also directly adopt an input socket with a leakage protector and an air switch arranged inside, so as to reduce connection wiring from inside to outside of the charging cabinet.

The USB power management system provided by the embodiment adopts alternating current power supply, is convenient for taking a main power grid, is connected with a leakage protector or an air switch after passing through an appliance input socket with a seesaw switch, and enters a switching power supply module of the system to supply power; the switching power supply module can be N independent switching power supplies with the power of 400W, the output voltage of 5V and the output current of 80A, alternating current is converted into direct current to be output, the N switching power supplies are connected in parallel through a bus and are connected with an input socket through the bus, and 1+ N system layout is achieved; compared with the N +1 parallel system layout with each switching power supply independently provided with one input socket, the system interference and the additional fault rate of a complex current equalizing circuit can be avoided.

and the extended function module is connected with the switching power supply module and used for providing the power supply voltage for external equipment to enable the external equipment to work, wherein the external equipment is connected with the equipment where the USB power supply management system is located.

The equipment where the USB power management system is located is the charging cabinet, and the external equipment comprises any one or more of ultraviolet disinfection equipment, ozone disinfection equipment, a cooling fan, an illuminating lamp and the like which can directly work according to the power supply voltage. The extended function module is uniformly powered by the switching power supply module, so that the expandability of the functions of the charging cabinet is realized.

The USB power management system provided in this embodiment provides multiple interfaces with multiple extended functions, which facilitates the stacking of different functions.

In one embodiment, as shown in the connection diagram of fig. 3, the switching power supply module includes:

the high-voltage inverter circuit is respectively connected with the inverter control circuit and the first rectification filter circuit and is used for carrying out inverter processing on the direct current pulsating high voltage according to the initial control signal to obtain high-frequency alternating square wave voltage with adjustable duty ratio;

Specifically, the input end of the first rectifying and filtering circuit, that is, the input end of the switching power supply module, is connected to the mains supply interface, receives the mains supply voltage, and specifically may be connected to the mains supply interface through the socket module. And the output end of the second rectifying and filtering circuit, namely the output end of the switching power supply module is connected with the input end of the charging control module. The inversion control circuit is a switching power supply module for converting mains supply voltage into enabling of supply voltage with different voltage values, generating corresponding initial control signals and then sending the initial control signals to the high-voltage inversion circuit, the high-voltage inversion circuit performs inversion processing on direct current pulsating high voltage output by the first rectification filter circuit on the basis of enabling of the initial control signals to obtain high-frequency alternating square wave voltage with adjustable duty ratio, the voltage conversion circuit converts the high-frequency alternating square wave voltage into target high-frequency alternating square wave voltage, namely the high-frequency alternating square wave voltage required by the equipment to be charged, the high-frequency alternating square wave voltage is rectified and filtered by the second rectification filter circuit to obtain the supply voltage required by the equipment to be charged, and the supply voltage is input to the charging control module so as to provide the supply voltage to the corresponding equipment to be charged through a USB interface.

Further, as shown in the connection diagram of fig. 4, the high-voltage inverter circuit may include:

Specifically, the initial control signal received by the high-voltage inverter circuit is used as an enable signal, and can be enhanced through voltage transformation processing, and then the first switch unit is controlled to be switched on, so that the inversion processing of direct-current pulsating high voltage is realized, and the high-frequency alternating square wave voltage is obtained. The signal enhancement unit enhances the initial control signal output by the inversion control circuit, so that the first switch unit can work according to the enhanced target control signal, the problem that the switch tube cannot be driven to work due to insufficient voltage of the control signal is avoided, and the reliability of the switch power supply module is improved.

Further, as shown in the connection diagram of fig. 4, the inverter control circuit may include:

Specifically, among the inverter control circuit, can correspond according to the output of switching power supply module and adjust, after specifically sampling the supply voltage of second rectification filter circuit output through voltage sampling unit, by pulse control unit according to supply voltage with predetermine the cycle, generate drive signal to control second switch unit and switch on, realize generating corresponding initial control signal according to drive signal, and output initial control signal to signal enhancement unit, as high-pressure inverter circuit's enable signal.

Specifically, the circuit principle of the switching power supply module is as follows:

as shown in fig. 6, the circuit schematic diagram of the first rectifying and filtering circuit includes a thermistor RT1, a common mode inductor LF1, and a rectifier bridge BD 1;

pin 3 of common mode inductor LF1 is connected to one end of fuse FUS1, one end of resistor ZNR1, one end of resistor R121 and one end of capacitor CX1, the other end of fuse FUS1 is connected to the live wire of the mains interface, the other end of resistor R121 is connected to one end of resistor R120, the other end of resistor ZNR1, the other end of resistor R120, the other end of capacitor CX1 and one end of thermistor RT1 are all connected to pin 2 of common mode inductor LF1, the other end of thermistor RT1 is connected to the neutral wire of the mains interface, pin 1 of common mode inductor LF1 is connected to pin 3 of rectifier bridge BD1, one end of capacitor CY2 and one end of capacitor CX2, the other end of capacitor CY2 is connected to one end of capacitor CY1, and the other end of the capacitor CY1, the other end of the capacitor CX2 and a pin 2 of the rectifier bridge BD1 are connected with a pin 4 of the common-mode inductor LF1, the pin 4 of the rectifier bridge BD1 is grounded, and the pin 1 is connected with the high-voltage inverter circuit.

The thermistor RT1 at the front stage performs surge suppression, and a perfect EMC processing circuit is formed by the common-mode inductor LF1, the capacitor CX1, the capacitor CX2, the capacitor CY1 and the capacitor CY2, so that electromagnetic filtering on mains supply voltage is realized, the interference of a mains supply power grid on a switching power supply module can be weakened, and the pollution of a system to the power grid is reduced; the EMC processing circuit outputs the electromagnetically filtered mains voltage, and the mains voltage is rectified by a rectifier bridge BD1 adopting a bridge rectifier bridge to obtain direct-current pulsating high voltage.

As shown in fig. 7, which is a schematic circuit diagram of a high-voltage inverter circuit, in the high-voltage inverter circuit, a signal enhancement unit includes a transformer T2;

the transformer T2 can adopt an EI22 transformer, the first input terminal 3 and the second input terminal 5 of the transformer T2 are respectively connected with the inverter control circuit, the power supply terminal 4 is connected with the working voltage + Vcc through a resistor R19, the first output terminal 7 and the second output terminal 10 are both connected with the first switch unit, the first ground terminal 8 is grounded, the second ground terminal 9 is connected with the first switch unit, and the flying line Fly is connected with the voltage conversion circuit;

in the high-voltage inverter circuit, a first switch unit comprises a power switch tube Q1, a power switch tube Q2, an electrolytic capacitor CD1 and an electrolytic capacitor CD 2;

the base electrode of the power switch tube Q1 is connected with the cathode of the electrolytic capacitor CD3 and one end of the resistor R105 through the resistor R103, the other end of the resistor R105 is connected with the emitter of the power switch tube Q1, the anode of the diode D103 and the signal enhancement unit, and is specifically connected with the second grounding terminal 9 of the transformer T2, the anode of the electrolytic capacitor CD3 is connected with the anode of the diode D100 and the signal enhancement unit, and is specifically connected with the second output terminal 10 of the transformer T2, the cathode of the diode D100 is connected with one end of the resistor R104, the other end of the resistor R104 is connected with the cathode of the electrolytic capacitor CD3, and is also connected with the collector electrode of the power switch tube Q1 through the resistor R101 and the resistor R100, the collector electrode of the power switch tube Q1 and the cathode of the diode D103 are both connected with the first rectifying and filtering circuit, and is specifically connected with the pin 1 of the rectifying bridge BD 1;

the base electrode of the power switch tube Q2 is connected with the cathode of an electrolytic capacitor CD4 and one end of a resistor R109 through a resistor R108, the other end of the resistor R109, the emitter of the power switch tube Q2 and the anode of a diode D104 are all grounded, the anode of the electrolytic capacitor CD4 is connected with the anode of a diode D101 and a signal enhancement unit respectively, specifically, the anode of the electrolytic capacitor CD4 is connected with the first output end 7 of a transformer T2, the cathode of the diode D101 is connected with one end of the resistor R102, the other end of the resistor R102 is connected with the cathode of an electrolytic capacitor CD4, the other end of the resistor R102 is connected with the collector of a power switch tube Q2 through a resistor R107 and a resistor R106, and the collector of the power switch tube Q2 and the cathode of the diode D104 are both connected with the emitter of the power switch tube Q1;

the positive electrode of the electrolytic capacitor CD1 and one end of the resistor R115 are both connected with the first rectifying and filtering circuit, specifically connected with the pin 1 of the rectifier bridge BD1, the negative electrode of the electrolytic capacitor CD1, the other end of the resistor R115, the positive electrode of the electrolytic capacitor CD2 and one end of the resistor R114 are both connected with the voltage conversion circuit, and the negative electrode of the electrolytic capacitor CD2 and the other end of the resistor R114 are both grounded.

The electrolytic capacitor CD1, the electrolytic capacitor CD2, the power switch tube Q1 and the power switch tube Q2 form four bridge arms, two upper bridge arms and two lower bridge arms, when Q1 is turned on and Q2 is turned off, Q1 and CD2 can form a path, correspondingly, when Q1 is turned off and Q2 is turned on, Q2 and CD1 can form a path, wherein the on and off of Q1 and Q2 can be correspondingly switched according to an initial control signal of one period, for example, in the first half period of a preset period, Q1 is turned on and off Q2, and in the second half period, Q1 is turned off and Q2 is turned on, and the specific period duration can be set according to actual requirements. The power switch tube Q1 and the power switch tube Q2 are alternately conducted in a preset period, the direct current pulse high voltage is converted into high-frequency alternating square wave voltage with adjustable duty ratio, and the high-frequency alternating square wave voltage is output to the voltage conversion circuit.

As shown in fig. 8, which is a schematic circuit diagram of a voltage converting circuit and a second rectifying and filtering circuit, the voltage converting circuit includes a power transformer T1;

the power transformer T1 may adopt an EE42 transformer, the 1 st end of a primary winding T1A of the power transformer T1 is connected to a high-voltage inverter circuit, specifically to a flying lead Fly of the transformer T2 in the signal enhancement unit, the 2 nd end of the primary winding T1A is connected to one end of a capacitor C3, the other end of the capacitor C3 is connected to the high-voltage inverter circuit, specifically to a common junction of the negative electrode of the electrolytic capacitor CD1, the other end of the resistor R115, the positive electrode of the electrolytic capacitor CD2 and one end of the resistor R114 in the first switch unit, the 2 nd end of the primary winding T1A is further connected to one end of a capacitor C109 through a resistor R110, a resistor R110A, a resistor R110B and a resistor R110C which are connected in parallel, and the other end of the capacitor C109 is connected to the 1 st end of the primary winding T1A; 9-11 ends of a secondary winding T1B of the power transformer T1 are connected in parallel, 12-14 ends are connected in parallel, the 9-11 ends connected in parallel are used as a first output end of a secondary winding T1B, the 12-14 ends connected in parallel are used as a second output end of the secondary winding T1B, the first output end and the second output end are both connected with a second rectifying and filtering circuit, 5-8 ends of the secondary winding T1B are connected in parallel, the 5-8 ends connected in parallel are grounded, a 15 th end of the secondary winding T1B is connected with an anode of a diode D5, a cathode of the diode D5 is connected with an operating voltage + Vcc, a 16 th end of the secondary winding T1B is connected with an anode of a diode D6, and a cathode of the diode D6 is connected with the operating voltage + Vcc.

The primary winding T1A of the power transformer T1 can work in the current of positive and negative directions, the bidirectional magnetization is realized, the energy is transferred to the secondary winding T1B while the magnetization is carried out, the current is symmetrical in a period, and the capacitor C3 blocks direct current and alternating current, so that the saturation problem does not exist; the secondary winding T1B receives the energy transmitted by the primary winding T1A, so that voltage conversion is realized, the high-frequency alternating square-wave voltage is converted into a target high-frequency alternating square-wave voltage, and the target high-frequency alternating square-wave voltage is output to the second rectifying and filtering circuit.

With continued reference to the circuit schematic of fig. 8, the second rectifying-filtering circuit includes a schottky diode D11, a schottky diode D12, a schottky diode D13, and a schottky diode D14;

pin 1 and pin 3 of schottky diode D11 and pin 1 and pin 3 of schottky diode D12 are both connected to a voltage conversion circuit, specifically to a first output terminal of a secondary winding T1B in a power transformer T1, and are also connected to one end of a capacitor C300 through a resistor R306, a resistor R305 and a resistor R304 connected in parallel, the other end of the capacitor C300 is connected to pin 2 of schottky diode D11, pin 2 of schottky diode D12, one end of an inductor L1, pin 2 of schottky diode D13 and pin 2 of schottky diode D14, pin 2 of schottky diode D13 and pin 2 of schottky diode D14 are also connected to one end of a capacitor C300-1 through a resistor R306-1, a resistor R305-1 and a resistor R304-1 connected in parallel, the other end of the capacitor C300-1, pin 1 and pin 3 of schottky diode D13, and pin 1 and pin 3 of schottky diode D14 are both connected to the voltage conversion circuit, particularly, the second output end of the secondary winding T1B in the power transformer T1 is connected; the other end of the inductor L1 is connected to the anode of the electrolytic capacitor CD9, the anode of the electrolytic capacitor CD10, the anode of the electrolytic capacitor CD11 and the anode of the electrolytic capacitor CD12, and is further connected to one end of the resistor R300, one end of the resistor R301, one end of the resistor R302, the anode of the light emitting diode LED1 and the charging control module, the other end of the light emitting diode LED1 is grounded through the resistor R303, and the cathode of the electrolytic capacitor CD9, the cathode of the electrolytic capacitor CD10, the cathode of the electrolytic capacitor CD11, the cathode of the electrolytic capacitor CD12, the other end of the resistor R300, the other end of the resistor R301 and the other end of the resistor R302 are all grounded.

The second rectifying and filtering circuit rectifies the target high-frequency alternating square-wave voltage output by the secondary winding T1B by using a Schottky tube D12-D14, and then filters the rectified target high-frequency alternating square-wave voltage through an LC filtering energy storage circuit formed by an inductor L1 and an electrolytic capacitor CD9-CD12 to obtain an ideal target direct-current output voltage + V which is used as a power supply voltage and output.

As shown in fig. 9, which is a schematic circuit diagram of an inverter control circuit, in the inverter control circuit, a voltage sampling unit includes a potentiometer SVR1, a power switch Q5, and a plurality of resistors;

one end of a capacitor C8, one end of a resistor R17 and one end of a resistor R16 are all connected with the second rectifying and filtering circuit, the supply voltage + V is sampled, the other end of a capacitor C8 and the other end of a resistor R17 are all connected with one end of a resistor R18, the other end of a capacitor C8 is also connected with the pulse control unit, the other end of a resistor R18 is respectively connected with the 2 nd end of a potentiometer SVR1, one end of a resistor R23 and one end of a resistor R24, the other end of a resistor R16 is respectively connected with the base of a power switch tube Q5 and one end of a resistor R15, the 1 st end and the 3 rd end of a potentiometer SVR1, the other end of a resistor R23, the other end of a resistor R24, the other end of a resistor R15 and the emitter of a power switch tube Q5 are all grounded, the collector of the power switch tube Q7 is respectively connected with the working voltage + ZD 36874 and the positive pole of an electrolytic capacitor CD1, the negative pole of the diode 1 and the pulse control unit 1, the other end of the resistor R3 and the negative electrode of the electrolytic capacitor CD7 are both grounded.

In the inversion control circuit, the pulse control unit comprises a controller U1 and peripheral devices thereof;

the controller U1 can adopt a pulse width modulation control chip of TL494 model, and is provided with two closed loop circuits; pin 1 of the controller U1 is connected to the voltage sampling unit, specifically to the other end of the capacitor C8 in the voltage sampling unit; pin 2 of the controller U1 is connected to one end of a resistor R4, one end of a resistor R5 and one end of a resistor R6, the other end of the resistor R4 is connected to one end of a capacitor C2, the other end of a capacitor C2 is connected to one end of a capacitor C4, one end of a capacitor C5 and pin 3 of the controller U1, the other end of the capacitor C4 is grounded, the other end of the capacitor C5 is connected to pin 15 of the controller U1 through the resistor R7, the other end of the resistor R5 is grounded, the other end of the resistor R6 is connected to one end of a resistor R9, pin 13 and pin 14 of the controller U1, the other end of the resistor R9 is connected to pin 15 of the controller U1, and pin 2 is connected to pin 3 through a capacitor C31; pin 3 of controller U1 is also connected to ground through capacitor C4; a pin 4 of the controller U1 is connected to one end of a resistor R8, one end of an electrolytic capacitor C6 and a voltage sampling unit, specifically to the cathode of a diode D1 and one end of a resistor R3 in the voltage sampling unit, and the other ends of the resistor R8 and the electrolytic capacitor C6 are both connected to a pin 13 and a pin 14 of the controller U1; a pin 5 of the controller U1 is connected with one end of a capacitor C1, a pin 6 is connected with one end of a resistor R2, and the other end of the capacitor C1, the other end of the resistor R2 and a pin 7 are all grounded; a pin 8 of the controller U1 is connected with the second switch unit, a pin 9 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with the pin 8 and one end of a resistor R10 respectively, and the other end of the resistor R10 is connected with the working voltage + Vcc; a pin 10 of the controller U1 is connected with one end of a resistor R12, the other end of the resistor R12 is connected with a pin 11 and one end of a resistor R11 respectively, the other end of the resistor R11 is connected with the working voltage + Vcc, and the pin 11 is also connected with a second switch unit; the other end of the resistor R10 and the other end of the resistor R11 are also connected with one end of the capacitor C9 and the anode of the electrolytic capacitor CD5, and the pin 9, the pin 10, the other end of the capacitor C9 and the cathode of the electrolytic capacitor CD5 are grounded; pin 12 of controller U1 is connected to operating voltage + Vcc; the pin 13 and the pin 14 of the controller U1 are also connected with the positive electrode of the electrolytic capacitor C32, and the negative electrode of the electrolytic capacitor C32 is grounded; the pin 16 of the controller U1 is connected to one end of a resistor R13 and one end of a capacitor C7, respectively, and the other end of the resistor R13 and the other end of the capacitor C7 are grounded.

In the inversion control circuit, the second switch unit comprises a triode Q3 and a triode Q4;

the base electrode of the triode Q3 is connected with the pulse control unit, particularly connected with a pin 11 of a controller U1, the collector electrode of the triode Q3 is respectively connected with the cathode of a diode D8 and a high-voltage inverter circuit, particularly connected with a first input end 3 of a transformer T2 in the signal enhancement unit, the emitter electrode of the triode Q3 is respectively connected with the emitter electrode of the triode Q4 and the anode of the diode D8, the positive electrode of the diode D7, the positive electrode of the diode D9 and the positive electrode of the electrolytic capacitor CD6 are connected, the base electrode of the triode Q4 is connected with the pulse control unit, specifically, the base electrode of the triode Q4 is connected with a pin 8 of the controller U1, the collector electrode of the triode Q4 is respectively connected with the negative electrode of the diode D7 and the high-voltage inverter circuit, specifically, the collector electrode of the triode Q4 is connected with the second input end 5 of the transformer T2 in the signal enhancement unit, the negative electrode of the diode D9 is connected with the positive electrode of the diode D10, and the negative electrode of the diode D10 and the negative electrode of the electrolytic capacitor CD6 are both grounded.

The controller U1 adjusts a preset period according to the capacitor 1 and the resistor R2, outputs a driving signal through the pin 11 to control the conduction of the triode Q3 in the first half period of the preset period, generates an initial control signal, and outputs the initial control signal to control the conduction of the power switch tube Q1 of the first switch unit in the high-voltage inverter circuit; outputting a driving signal through a pin 8 to control the conduction of a triode Q4 in the second half period of the preset period, generating an initial control signal, and outputting the initial control signal to control the conduction of a power switch tube Q2; it is understood that, in this embodiment, the pin 11 and the pin 8 of the controller U1 respectively output inverted driving signals for alternately driving the transistor Q3 and the transistor Q4 to be conductive during a predetermined period.

The voltage sampling unit samples the voltage output by the switching power supply module, namely the power supply voltage, and the voltage sampling unit provides the voltage for the controller U1, and forms a voltage loop with the controller U1, so that the switching power supply module can be in voltage dynamic balance. The switching power supply module adopts a half-bridge working mode and adopts a complete EMC measure, so that the interference among a large number of charging loads can be avoided, and a perfect charging effect can be achieved.

In this embodiment, as shown in fig. 10, a schematic circuit diagram of each interface involved in the switching power supply module is shown, and each interface includes an interface for outputting a supply voltage obtained by the switching power supply module, an interface for connecting a commercial power grid or an outlet module, and the like. For example, an interface CN1 and an interface CN2 may be provided at the output end of the second rectifying and filtering circuit to output the supply voltage; an interface JXZ can be arranged at the input end of the first rectifying and filtering circuit, and comprises three lines, namely a live line L, a zero line N and a ground line FG which are used for connecting a mains supply interface; an interface V1 and an interface V2 can be separately set, and the working voltage + Vcc is converted into the working voltage with other voltage values by a voltage converter U3 and then is provided to required equipment by interfaces V1 and V2, wherein the input end of the voltage converter U3 is respectively connected with the working voltage + Vcc and one end of a capacitor C10, the output end of the voltage converter U3 is respectively connected with one end of a resistor R21 and the interface V1, an adjustable voltage pin ADJ is respectively connected with the other end of a resistor R21 and one end of a resistor R22, and the other end of the resistor R22 and the other end of the capacitor C10 are grounded; interfaces J1, J2, TT2, TT3, TT4 and the like are arranged in the second rectifying and filtering circuit, behind the rectifier and in front of the filter, and an interface TT1 is arranged at the other end of the inductor L1 and used for rectifying the target high-frequency alternating square wave voltage and then directly providing the rectified target high-frequency alternating square wave voltage to required equipment; the extended function module may include interfaces PAD1, PAD2, PAD3, PAD4, PAD5, heating interface 300SRQ, interfaces PAD7, PAD8, and PAD9, for connecting various external devices, and when connection is not required, the interfaces are left empty. In the switching power supply module, each port may also be connected to ground through a capacitor, for example, the output terminal of the second rectifying and filtering circuit may be connected to ground through the capacitor CY5, when the 5 th to 8 th terminals connected in parallel in the secondary winding T1B of the power transformer T1 are connected to ground, the 5 th to 8 th terminals may be connected to ground through the capacitor CY3, and the other ground terminals may be connected to ground through the capacitor CY 4. The functions and the specific connection modes which can be realized by each interface can be adjusted according to the actual situation.

In another embodiment, as shown in the connection diagram of fig. 5, the switching power supply module may further include:

As shown in the schematic circuit diagram of fig. 9, the over-temperature protection circuit includes a temperature protection switch RTSW1, and the temperature protection switch RTSW1 may be a TB05-a protection switch, one end of which is connected to the pin 12 of the controller U1, and the other end of which is connected to the operating voltage + Vcc. When the temperature in the switching power supply module is detected to be too high, the switching power supply module is automatically in a protection state, and a working power supply of a pulse control unit in the inversion control circuit is cut off, so that the inversion control circuit stops working, the whole switching power supply module stops working, and the phenomenon that the switching power supply module is damaged or even has other faults due to too high temperature is avoided.

As shown in the schematic circuit diagram of fig. 9, the overvoltage protection circuit includes a zener diode ZD2 and a diode D2, a cathode of the zener diode ZD2 is connected to the second rectifying and filtering circuit, specifically, the zener diode ZD2 is connected to the second rectifying and filtering circuit through a voltage sampling unit, an anode of the zener diode ZD2 is connected to an anode of the diode D2, a cathode of the diode D2 is connected to a collector of a power switch Q5 of the voltage sampling unit in the inverter control circuit, and a signal, which controls the voltage sampling unit to input to the controller U1 of the pulse control unit, is an overvoltage detection signal, so that the controller U1 adjusts a duty ratio of a driving signal output to the second switch unit according to the overvoltage detection signal, thereby adjusting an initial control signal output, stopping the high-voltage inverter circuit, and implementing an overvoltage protection function.

As shown in the schematic circuit diagram of fig. 9, the overload protection circuit includes a current feedback circuit composed of power resistors JR1, JR2, JR3, JR4, JR5 and JR6, wherein one end of each of the power resistors JR1-JR6 is connected to the second rectifying and filtering circuit, the other end of each of the power resistors is connected to one end of a resistor R20, the other end of the resistor R20 is connected to a pin 15 of a controller U1 of a pulse control unit in the inverter control circuit, and a sampled feedback signal, i.e., an overcurrent detection signal, is input to the controller U1 of the pulse control unit, so that the controller U1 adjusts a duty ratio of a driving signal output to the second switching unit according to the overcurrent detection signal, thereby adjusting an initial control signal output, stopping the high-voltage inverter circuit, and implementing the overload protection function.

Further, as shown in the connection diagram of fig. 11, the charging control module includes:

Specifically, as shown in fig. 12, which is a schematic circuit diagram of a USB switch circuit, the USB switch circuit includes a connector CN4, a switch chip U2, and a connector CN 3;

the switch chip U2 can adopt an N-channel MOSFET chip integrated with an ultra-low on-resistance and having the model number of SC7002, the chip is a high-current switch of a USB port application program, integrates a USB charging interface controller, and automatically supports a DCP scheme, a frequency division mode and a 1.2V/1.2V mode of a battery charging specification, and has the functions of input overvoltage protection, undervoltage protection, output short-circuit protection, overheating protection and the like. Connector CN3 may be an A-type USB port with DP data line pin D _ P and DM data line pin D _ N.

Wherein, the connector CN4 may be connected to the output interface CN1 or CN2 of the switching power module, the connector CN4 is connected to one end of the electrolytic capacitor C13, one end of the ceramic capacitor C14 and the input end VIN of the switching chip U2, the input end VIN of the switching chip U2 is further connected to an input voltage +5VIN, the input voltage +5VIN may be provided by the output of the switching power module or by an external power supply, the other end of the electrolytic capacitor C13 and the other end of the ceramic capacitor C14 are grounded, the setting end ISET of the switching chip U2 is grounded through the resistor R25, the peripheral resistor R25 may implement programmable output current of the switching chip U2, support an a-type USB port, a-signal and a DM signal, the switching chip U2 may monitor voltages of the DP data line and the DM data line, and is specifically connected to the pin D _ P of the connector CN3 through the DP end of the switching chip U2, and the pin N _ P of the connector CN3 are connected to the DM terminal of the switch chip U2, the output terminal VOUT of the switch chip U2 is connected to one end of the ceramic capacitor C11, one end of the electrolytic capacitor C12, and the pin VBUS of the connector CN3, respectively, the other end of the ceramic capacitor C11 and the other end of the electrolytic capacitor C12 are grounded, and the pin GND of the connector CN3 is grounded through the power resistor R26, and is also connected to the status display circuit.

In order to realize the balance and interference suppression of the whole USB power management system, the influence of adverse voltage generated by a direct current load is eliminated through the electrolytic capacitor C13 while the input power supply voltage is realized for a single charging control module, the ceramic capacitors C14 and C11 can prevent the influence of parasitic parameters in the charging control module from generating self excitation, and the electrolytic capacitor C12 is added to the output end VOUT, so that the charging direct current voltage can be optimized. The USB switching circuit can prevent the system from being accessed to various devices to be charged, such as various different electronic terminal devices, and the interference is generated.

Specifically, as shown in fig. 13, the circuit schematic diagram of the status display circuit includes a control chip U3 and indicator lights RL1 and BL1 of different colors;

the positive input end IN + of the control chip U3 is connected with one end of a resistor R29 and one end of a resistor R30 respectively, the other end of the resistor R29 is connected with an input voltage +5VIN, the other end of the resistor R30 is grounded, the negative input end IN-of the control chip U3 is connected with a USB switch circuit, and specifically is connected with a pin GND of a connector CN3, a power supply end VDD of the control chip U3 is connected with one end of the resistor R27 and one end of a capacitor C15 respectively, the other end of the resistor R27 is connected with the input voltage +5VIN, the other end of the capacitor C15 is grounded, a first output end RL + of the control chip U3 is connected with the positive electrode of an indicator lamp RL1, a second output end BL + of the control chip U3 is connected with the positive electrode of the indicator lamp BL1, the negative electrode of the indicator lamp RL1 and the negative electrode of the indicator lamp BL1 are both connected with one end of the resistor R28, and the other end of the resistor R28 is grounded.

The control chip U3 can adopt HX528A/HX508A current detection chips to detect the voltage of the power resistor R26, form the input of the schmitt trigger with the internal voltage reference, control the states of the indicator lamps RL1 and BL1 through the output of the comparator, and display the charging state of the system more manually.

It should be noted that, in the above circuit principle, the layout can be performed in a manner of extremely short circuit routing, and in the principle of proximity, the complicated circuit routing and the self interference are avoided, so that the charging effect of the system is further optimized.

According to the USB power management system, the socket module and the extended function module are additionally arranged, so that a leakage protection function can be provided for the system, and more extended functions can be realized; in the switching power supply module, the mains supply voltage is uniformly controlled by the inverter control circuit, and is converted into power supply voltages with different voltage values after passing through the first rectifying and filtering circuit, the high-voltage inverter circuit, the voltage conversion circuit and the second rectifying and filtering circuit, so that the power supply voltage can be provided for various devices to be charged with different requirements, the quantity of the charging devices can be conveniently expanded, the system can better meet the requirements of various devices to be charged, and the power supply effect is improved; the use of the power adapter is reduced, so that the wiring layout of the power adapter is reduced, the wiring of the whole system is simple, and the system safety is improved.

EXAMPLE III

Referring to fig. 14, fig. 14 is a connection diagram of a USB power management system according to a third embodiment of the present invention; on the basis of the first embodiment or the second embodiment, the present embodiment further provides a USB power management system.

Further, as shown in the connection diagram of fig. 14, the system may further include:

The external system may include system structures corresponding to different functions of the charging cabinets such as an intelligent control system of the charging cabinet, a face recognition system and the like, and may specifically provide power supply voltage for each module in the external systems, for example, may provide the power supply voltage for any one or more of module devices that can directly operate according to the power supply voltage, such as a main control module, a storage module, a display module, a wireless module, a bluetooth module, a lock control module, an infrared module, a fingerprint module, a camera module, a card swiping module, a lighting module and the like.

The USB power management system that this embodiment provided provides the power supply output module who supplies power for other external systems in the cabinet that charges that USB power management system located, exports power supply voltage to each module of external system, can improve the availability factor and the effective cost-effective of practicing thrift of the interior power of cabinet that charges.

Example four

The embodiment provides a charging cabinet, and this charging cabinet can include:

the USB power management system comprises a body and the USB power management system.

Wherein, USB power management system sets up in the body.

Further, the charging cabinet may further include:

and the external system is arranged in the body and is connected with the USB power management system.

It should be noted that, the specific structure of the USB power management system may refer to all the embodiments described above, and since the present embodiment adopts all the technical solutions of all the embodiments described above, at least all the beneficial effects brought by the technical solutions of the embodiments described above are achieved, and are not described in detail herein.

It should be noted that the above-mentioned serial numbers of the embodiments of the present invention are merely for description, and do not represent the merits of the embodiments. The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A USB power management system, the system comprising:

2. The USB power management system of claim 1, wherein the system further comprises:

3. The USB power management system of claim 2, wherein the receptacle module comprises:

and the air switch is respectively connected with the leakage protector and the at least one switch power supply module and is used for controlling the on-off of the mains voltage input to the switch power supply module.

4. The USB power management system of claim 1, wherein the system further comprises:

and/or the presence of a gas in the gas,

5. The USB power management system of claim 1, wherein the switching power supply module comprises:

the first rectification filter circuit is used for carrying out filtering and rectification processing on the mains supply voltage to obtain direct current pulsating high voltage;

6. The USB power management system of claim 5, wherein the high voltage inverter circuit comprises:

7. The USB power management system of claim 6, wherein the inverter control circuit comprises:

8. The USB power management system of claim 5, wherein the switching power module further comprises:

9. The USB power management system of claim 1, wherein the charging control module comprises:

10. A charging cabinet, comprising:

a body and the USB power management system of any one of claims 1 to 9;

the USB power management system is arranged in the body.