Circuit based on network power supply and charging conversion equipment

Abstract

The utility model provides a network power supply-based circuit and a charging conversion device, and relates to the technical field of power supply charging. The information output end of a network interface is connected with the information receiving end of an Ethernet transformer; an idle line end in the network interface and a data line end in the Ethernet transformer are simultaneously connected with an input end of the rectifier module; the first output end of the rectifier module is connected with the first input end of the first control module and one end of the primary side of the transformer, and the other end of the rectifier module is grounded; the output end of the first control module is connected with the other end of the primary side of the transformer to control the transformation ratio of the transformer; the secondary side of the transformer is connected with the output interface through the second control module. According to the utility model, the problem that the charging equipment in the prior art cannot meet the charging requirement of a user in a special environment is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply, and in particular to a circuit based on network power supply and a charging conversion device. Background Art

[0002] Current mobile phone charging devices mainly rely on 220V AC power supply. This power supply method is particularly simple. If there is no AC access point, the mobile phone cannot be charged, and the applicable scenarios are limited.

[0003] Similarly, in some specific occasions, such as hospital operating rooms and important laboratories, safety regulations do not allow external devices to access the power grid, which also limits the possibility of mobile phone charging. These restrictions make the application scenarios of mobile phone charging equipment quite limited and cannot meet the charging needs of users in various environments. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a circuit and a charging conversion device based on network power supply, which solves the problem that the charging device in the prior art cannot meet the charging needs of users under special circumstances.

[0005] At least one embodiment of the utility model provides a network-powered circuit, comprising: a network interface, an Ethernet transformer, a rectifier module, a first control module, a transformer, a second control module, and an output interface, wherein:

[0006] The information output end of the network interface is connected to the information receiving end of the Ethernet transformer, and the idle line end in the network interface and the data line end in the Ethernet transformer are simultaneously connected to the input end of the rectifier module;

[0007] The first output end of the rectifier module is connected to the first input end of the first control module and one end of the primary side of the transformer, and the other end of the rectifier module is grounded;

[0008] The output end of the first control module is connected to the other end of the primary side of the transformer to control the transformation ratio of the transformer;

[0009] The secondary side of the transformer is connected to the output interface through the second control module.

[0010] The beneficial effects of adopting the above scheme are:

[0011] The idle line ends in the network interface and the data line ends in the Ethernet transformer can be used to provide basic voltage for the rectifier module;

[0012] Then, after rectification, the voltage input to the rectifier module is input to the first control module, and the voltage is detected by the first control module to see if it meets the corresponding PoE protocol standard. If it meets the standard, the first control module controls the transformer ratio to output a fixed and standard voltage.

[0013] The voltage output by the transformer is then input into the second control module, and the second control module is used to convert the voltage into a voltage supported by the target device for charging. After adopting the above scheme, the function of charging the target device using a network cable can be realized, which increases the charging method and solves the problem that the existing city power supply mode cannot meet the user's charging needs under special circumstances.

[0014] In a network-powered circuit provided in one embodiment of the present utility model, the first control module includes a first control chip and a first switch tube, wherein:

[0015] The first output terminal of the rectifier module is connected to the first input terminal of the first control chip;

[0016] The output end of the first control chip is connected to the control end of the first switch tube, and the other end of the primary side of the transformer is grounded through the input end of the first switch tube and the output end of the first switch tube in sequence.

[0017] The beneficial effects of adopting the above scheme are:

[0018] By controlling the control end of the first switch tube by the first control chip, the first switch tube can be quickly turned on or off within a certain period of time, thereby controlling the primary side of the transformer to be quickly turned on or off, thereby achieving the effect of controlling the transformer transformation ratio.

[0019] In a network-powered circuit provided in one embodiment of the utility model, a common-mode choke is also included. The first output end of the rectifier module is connected to the first input end of the first control chip and one end of the primary side of the transformer through one end of the common-mode choke, and the second output end of the rectifier module is grounded through the other end of the common-mode choke.

[0020] The beneficial effects of adopting the above scheme are:

[0021] The common mode choke can be used to filter the voltage output by the rectifier coil.

[0022] In a network-powered circuit provided by one of the embodiments of the present invention, the second input end of the first control chip is connected to the other end of the common-mode choke.

[0023] The beneficial effects of adopting the above scheme are:

[0024] After the first input terminal of the first control module detects the voltage information, the corresponding voltage information can be classified through the second input terminal of the second control chip.

[0025] In a network-powered circuit provided in one embodiment of the present utility model, the second control module includes a second control chip and a second switch tube, wherein:

[0026] The secondary side of the transformer is connected to the first input end of the second control chip through the input end of the second switch tube and the output end of the second switch tube in sequence;

[0027] The first output terminal of the second control chip is connected to the output interface;

[0028] The control end of the second switch tube is connected to the second output end of the second control chip.

[0029] The beneficial effects of adopting the above scheme are:

[0030] By controlling the second switch tube through the second control chip, the voltage outputted by the secondary side of the transformer and the conduction of the second control chip can be controlled.

[0031] In a network-powered circuit provided in one embodiment of the utility model, the second input terminal of the second control chip is connected to the secondary side of the transformer.

[0032] The beneficial effects of adopting the above scheme are:

[0033] At this time, during the charging process of the network cable, the voltage converted by the secondary side of the transformer can be used to power the second control chip.

[0034] In a network-powered circuit provided in one embodiment of the utility model, a standard power supply is also included, and the power input terminal of the second control chip is connected to the standard power supply and the secondary side of the transformer at the same time.

[0035] The beneficial effects of adopting the above scheme are:

[0036] When there is no network cable power supply, the second control chip can be powered by a standard power supply.

[0037] In a network-powered circuit provided in one embodiment of the present utility model, a third switch tube and a fourth switch tube are also included, wherein:

[0038] The standard power supply is connected to the input end of the fourth switch tube, the output end of the fourth switch tube is connected to the input end of the third switch tube, and the output end of the third switch tube is connected to the first input end of the second control chip;

[0039] The control end of the third switch tube is connected to the first output end of the second control chip;

[0040] The control end of the fourth switch tube is connected to the third output end of the second control chip.

[0041] The beneficial effects of adopting the above scheme are:

[0042] By using the fourth switch tube, when the network cable is supplying power, the fourth switch tube can be controlled to be turned off to prevent the current output from the secondary side of the transformer from directly entering the target device;

[0043] At the same time, the third switch tube can be used to prevent current backflow when using a standard power supply, thereby achieving an anti-reverse effect.

[0044] In a network-powered circuit provided in one embodiment of the utility model, the rectifier module includes a first rectifier bridge and a second rectifier bridge, wherein:

[0045] The input end of the first rectifier bridge is connected to the idle line end in the network interface;

[0046] The input end of the second rectifier bridge is connected to the data line end of the Ethernet transformer;

[0047] The first output end of the first rectifier bridge is connected to the first output end of the second rectifier bridge to serve as the first output end of the rectifier module, and the second output end of the first rectifier bridge is connected to the second output end of the second rectifier bridge to serve as the second output end of the rectifier module.

[0048] The beneficial effects of adopting the above scheme are:

[0049] By utilizing two rectifier bridges, the current outputted from the idle line end of the network interface and the data line end of the Ethernet transformer can be rectified respectively, so as to enhance the power supply effect of the utility model.

[0050] The utility model also provides a charging conversion device, comprising the above-mentioned network-powered circuit.

[0051] The beneficial effects of adopting the above scheme are:

[0052] By using this device, you can connect to a network cable through the network interface on the device, and connect to a target device through the output interface on the device, so as to charge the target device through the network cable, meeting the charging needs of users in special environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1This is a schematic diagram of the structure of a circuit based on network power supply according to the utility model;

[0054] Figure 2 This is the circuit diagram of the PoE power supply part;

[0055] Figure 3 for Figure 2 A partial enlarged view of position 101;

[0056] Figure 4 for Figure 3 A partial enlarged view of position 1011;

[0057] Figure 5 for Figure 3 A partial enlarged view of position 1012;

[0058] Figure 6 for Figure 2 A partial enlarged view of position 102;

[0059] Figure 7 for Figure 2 A partial enlarged view of location 103;

[0060] Figure 8 for Figure 7 A partial enlarged view of position 1031;

[0061] Fig. 9 for Figure 7 A partial enlarged view of position 1032;

[0062] Fig.10 for Figure 7 A partial enlarged view of position 1031;

[0063] Fig.11 This is a schematic diagram of the specific circuit connection of the charging chip. DETAILED DESCRIPTION

[0064] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0065] Furthermore, those skilled in the art may combine and associate different embodiments or examples and features of different embodiments or examples described in this specification without mutual contradiction.

[0066] This utility model provides a circuit based on network power supply, please refer to Figure 1 As shown, it includes: a network interface, an Ethernet transformer, a rectifier module, a first control module, a transformer, a second control module and an output interface, wherein:

[0067] The information output end of the network interface is connected to the information receiving end of the Ethernet transformer, and the idle line end in the network interface and the data line end in the Ethernet transformer are simultaneously connected to the input end of the rectifier module;

[0068] The first output end of the rectifier module is connected to the first input end of the first control module and one end of the primary side of the transformer, and the other end of the rectifier module is grounded;

[0069] The output end of the first control module is connected to the other end of the primary side of the transformer to control the transformation ratio of the transformer;

[0070] The secondary side of the transformer is connected to the output interface through the second control module.

[0071] Please combine here Figure 2 , Figure 3 , Figure 4 as well as Figure 6 As shown, the network interface is represented by RJ45 in each figure, and the information output end of the network interface RJ45 is the TX-, TX+, RX- and RX+ ports on the network interface RJ45. The Ethernet transformer is represented by T55 in each figure, and its specific model is 15FB-30NL. The information receiving end of the Ethernet transformer T55 is the TX-, TX+, RX- and RX+ ports on the Ethernet transformer T55. It should be understood that the connection between the network interface and the Ethernet transformer is a prior art, which is used to convert the information transmitted from the network interface into a recognizable signal, and the connection between the two will not be repeated here.

[0072] The idle line ends are A4, A5, A6 and A7 on the network interface RJ45;

[0073] The above-mentioned data line ends are CT3 and CT4 ports on the Ethernet transformer T55, wherein the CT3 port is connected to the rectifier module through a resistor R56, and the CT4 port is connected to the rectifier module through a resistor R67; at the same time, the CT3 port is also grounded through a resistor R54 and a capacitor C63, and the CT4 port is grounded through a resistor R55 and a capacitor C63;

[0074] The idle line end in the network interface and the data end in the Ethernet transformer can be used to provide a basic voltage for the rectifier module;

[0075] Subsequently, the voltage input to the rectifier module is input to the first control module, and the first control module is used to detect whether the voltage meets the corresponding PoE protocol standard. If it meets the standard, the first control module controls the transformer ratio to output a fixed and standard voltage.

[0076] The voltage output by transformer T2 is then input into the charging module, that is, the second control module, and the voltage is converted into the voltage supported by the target device for charging. After adopting the above scheme, the function of charging the target device using the network cable can be realized, which solves the problem that the existing city network power supply mode cannot meet the user's charging needs under special circumstances.

[0077] Specifically, the rectifier module includes a first rectifier bridge and a second rectifier bridge. Figure 5 as well as Figure 6 As shown, the first rectifier bridge Figure 6 The first rectifier bridge is represented by D2, and the second rectifier bridge is represented by D3;

[0078] The input end of the first rectifier bridge D2 is connected to the idle line end in the network interface RJ45, and the input end of the second rectifier bridge D3 is connected to the data line end in the Ethernet transformer. Specifically, the left and right ends of the first rectifier bridge D2 are the input ends of the first rectifier bridge D2, that is, the left end of the first rectifier bridge D2 is connected to the A4 and A5 ends, and the right end of the first rectifier bridge D2 is connected to the A7 and A8 ends; similarly, the left and right ends of the second rectifier bridge D3 are the input ends of the second rectifier bridge D3, that is, the left end of the second rectifier bridge D3 is connected to the CT3 port, and the right end of the second rectifier bridge D3 is connected to the CT4 port;

[0079] The first output terminal of the first rectifier bridge D2 is connected to the first output terminal of the second rectifier bridge D3, that is, Figure 6 The upper ends of the first rectifier bridge D2 and the first rectifier bridge D3 are connected to serve as the first output end of the rectifier module, and the second output end of the first rectifier bridge D2 is connected to the second output end of the second rectifier bridge D3, that is, Figure 6 The lower ends of the first rectifier bridge D2 and the first rectifier bridge D3 are connected to serve as the second output end of the rectifier module.

[0080] By utilizing two rectifier bridges, the current outputted from the idle line end of the network interface and the data line end of the Ethernet transformer can be rectified respectively, so as to enhance the power supply effect of the utility model.

[0081] At the same time, the first rectifier bridge D2 and the second rectifier bridge D3 are also connected to an electrostatic protection circuit. Figure 6 As shown, the left and right ends of the first rectifier bridge D2 and the second rectifier bridge D3 are connected to the same capacitor C3 through different capacitors and resistors in sequence, and then grounded to eliminate interference caused by external static electricity.

[0082] For details, please refer to Figure 2 , Figure 7 , Figure 8 as well as Fig. 9 As shown, the first control module includes a first control chip and a first switch tube, wherein the first control chip is represented by U1 in each figure, and its specific model is TPS23750, the first switch tube is represented by Q2 in each figure, the transformer is an isolation transformer, represented by T2 in the figure, and its specific model is 15SEFD-3501GNL, one end of the primary side of the transformer T2 refers to PRI1 and PRI2 ports, and the two ports are connected together, the other end of the primary side of the transformer T2 refers to PRL11 and PRL12 ports, and the two ports are connected together, and the secondary side of the transformer is SEC5, SEC6, SEC7 and SEC8 ports;

[0083] The first output end of the rectifier module, that is, the upper end of the first rectifier bridge D2 and the second rectifier bridge D3, is connected to the first input end of the first control chip U1. The first output end of the first control chip U1 can be seen in FIG. Figure 8 As shown, it is the DET port on the first control chip U1. In order to protect the DET port from excessive input voltage, in this embodiment, the first output end of the rectifier module is actually connected to the DET port through a resistor R20. The DET port can be used to detect whether the voltage output from the rectifier module meets the PoE protocol standard;

[0084] The output end of the first control chip U1 is connected to the control end of the first switch tube Q2, and the PRL11 and PRL12 ports on the primary side of the transformer T2 are connected to the ground through the input end of the first switch tube Q2, the output end of the first switch tube Q2, and the resistor R25.

[0085] See here Figure 8 as well as Fig. 9 As shown, the first switch tube Q2 is a MOS tube, the control end is the gate of the MOS tube, and the output end of the first control chip U1 is the GATE port;

[0086] By controlling the control end of the first switch tube Q2 by the first control chip U1, the first switch tube Q2 can be quickly turned on or off within a certain period of time according to the preset frequency, thereby controlling the primary side of the transformer T2 to be quickly turned on or off, thereby achieving the effect of controlling the transformation ratio of the transformer T2.

[0087] Specifically, this circuit also includes a common mode choke. Figure 6 and Figure 7 As shown, the common mode chokes are represented by L1, L2 and L3 in the figure for filtering;

[0088] The first output end of the rectifier module, i.e., the upper ends of the first rectifier bridge D2 and the second rectifier bridge D3, are connected to one end of L1 through the common mode choke through the fuse PW9 in turn, and the other end of the common mode choke L1 is connected to the first input end of the first control chip U1, i.e., the DET port, and PRI1 and PRI2 on the primary side of the transformer T1. The second output end of the rectifier module, i.e., the lower ends of the first rectifier bridge D2 and the second rectifier bridge D3, is grounded through the common mode choke L3. The common mode choke can be used to filter the voltage output by the rectifier coil.

[0089] Specifically, the second input terminal of the first control chip U1 is connected to the other end of the common mode choke, that is, the CLASS port of the first control chip U1 is connected to L3 of the common mode choke through the resistor R21, that is, grounded.

[0090] After the first input terminal of the first control module detects the voltage information, the corresponding voltage information can be classified through the second input terminal of the second control chip.

[0091] Also, please refer to Figure 2 and Figure 6 As shown, a capacitor C4 is further connected between the first output terminal and the second output terminal of the rectifier module, and a diode D4 and a capacitor C12 are connected in parallel between L1 and L3 of the common mode choke coil;

[0092] Please refer to here Figure 8 As shown, the VSS port, PWPD port, RTN port, RSN port, COM port, SEN port and FB port of the first control chip U1 are grounded, the VBIAS port of the first control chip U1 is connected to the MODE port, the BL port is connected to one end of the capacitor C16 through the resistor R19, the VBIAS port is also connected to one end of the capacitor C16, the other end of the capacitor C16 is connected to the RTN port, the capacitor C16 is connected in parallel between the MODE port and the RTN port, the capacitor C16 is connected in parallel between the AUX port and the RTN port, and the capacitor C20 is connected in parallel between the RSP port and the RTN port; at the same time, after the power port VDD of the first control chip U1 is connected to SENP, it is connected to the first output end of the rectifier module to power the first control chip U1;

[0093] Please combine here Figure 7 , Figure 8 as well as Fig. 9 As shown, the TMR port on the first control chip U1 is connected to one end of the capacitor C13, the other end of the capacitor C13 is connected to the FREQ end of the first control chip U1 through the resistor R15, and is connected to the BL end through the resistor R17, the other end of the capacitor C13 is also grounded, and the BIAS3 port of the transformer T2 is grounded;

[0094] Between the other end of the capacitor C13 and the first output end of the rectifier module, capacitors C7, C25, 23 and C24 are connected in parallel. The AUX end of the first control chip U1 is connected to the BIAS10 end of the primary side of the transformer T2 through the diode D6 and the resistor R22 in sequence. The RSP end of the first control chip U1 is also connected to the other end of the first switch tube Q2 through the resistor R23.

[0095] The PRI1 and PRI2 terminals on the primary side of the transformer T1 are connected to one end of the first switch tube Q2 via capacitor C26 and diode D9 in sequence, and a resistor R29 is connected in parallel to the capacitor C26; the PRI11 and PRI12 terminals on the primary side of the transformer T2 are connected to the RTN terminal of the first control chip U1 via capacitor R27 and resistor R26 in sequence, and the RTN is also connected to the SEC5 and SEC6 ports on the secondary side of the transformer T2 via capacitor C18;

[0096] Please combine here Fig.10 As shown, the SEC5 and SEC6 ports on the secondary side of the transformer T2 are connected to each other and grounded. After the SEC87 port and the SEC8 port are connected, they are connected to the interface J20 through the diode DT13, the inductor L4 and the DT12 in sequence. Among them, the 1 interface of J20 is the output terminal VCC_12V_IN of the poe chip module part, and one end of the diode DT13 is connected to the other end of the diode DT13 through the resistor R28 and the capacitor C26 in sequence; the capacitors C21, C22, C15 and C17 are also connected in parallel between the other end of DT13 and the interface J20;

[0097] For details, please refer to Fig.10 and Fig.11 As shown, Fig.11 The part shown is the charging chip part, and the second control module includes a second control chip and a second switch tube, wherein the second control chip is represented by U32 in the figure, and its specific model is bq24170, and the second switch tube is represented by Q3 in the figure;

[0098] The secondary side of the transformer T2 is connected to the first input terminal of the second control chip U32 through the input terminal of the second switch tube Q3 and the output terminal of the second switch tube Q3 in turn. Specifically, the VCC_12_IN power supply outputted from the 1 interface of the interface J20 is connected to the CMSRC terminal of the second control chip U32 through the source and drain of the second switch tube Q3 and the resistor R12. The VCC_12_IN power supply is also connected to the CMSRC terminal of the second control chip U32 through the resistor R IN2 and capacitor C IN Ground.

[0099] The first output terminal SW of the second control chip U32 is connected to an inductor and R SRThe resistor is connected to the output interface, which is JP201, for connecting to the charging device. The first output terminal SW is also grounded through a diode; at the same time, the 1 interface of the output interface JP201 is grounded, and the 2 interface of JP201 is also grounded through the capacitor C9 and the capacitor C10. The resistor R SR There is also a capacitor C8 in parallel, and a resistor R SR One end of is grounded through capacitor C7, and the end is also connected to the SRP port of the second control chip U32, and the resistor R SR The other end is connected to the SPN port of the second control chip U32, and the end is also connected to the standard power supply VBAT;

[0100] The control end of the second switch tube Q3 is connected to the second output end of the second control chip U32. Specifically, the gate of the second control tube Q3 is connected to the ACDRV interface of the second control chip U32 through the resistor R11.

[0101] By controlling the second switch tube Q3 by the second control chip U32 , the voltage outputted by the secondary side of the transformer T2 and the conduction of the second control chip U32 can be controlled.

[0102] The second input terminal of the second control chip U32 is connected to the secondary side of the transformer T2. Specifically, the VCC_12_IN power supply is also connected to the power input terminal AVCC port of the second control chip U32 through the diode D1 and the resistor R1 in sequence. At the same time, the AVCC port is grounded through the capacitor C1, and the VCC_12_IN power supply is grounded through the resistor R6 and the resistor R7 in sequence. The OVPSET port of the second control chip U32 is connected between the resistor R6 and the resistor R7;

[0103] At this time, during the charging process of the network cable, the voltage converted by the secondary side of the transformer can be used to power the second control chip.

[0104] The circuit also includes a standard power supply VBAT, and a power input terminal AVCC port of the second control chip U32 is connected to the standard power supply and the secondary side of the transformer at the same time. Specifically, the standard power supply VBAT is connected to the AVCC port through a diode D2 and a resistor R1 in sequence;

[0105] When there is no network cable power supply, the second control chip can be powered by a standard power supply.

[0106] Specifically, the circuit further includes a third switch tube and a fourth switch tube, wherein the third switch tube is represented by Q4 and the fourth switch tube is represented by Q5 in the drawings;

[0107] The standard power supply VBAT is connected to the input end of the fourth switch tube Q5, the output end of the fourth switch tube Q5 is connected to the input end of the third switch tube Q4, and the output end of the third switch tube Q4 is connected to the first input end of the second control chip U32. Specifically, the standard power supply VBAT is connected to the drain of the fourth switch tube Q5, the source of the fourth switch tube Q5, the resistor R AC , the drain of the third switch tube Q4, the source of the fourth switch tube and the resistor R12, until they are connected to the CMSRC port of the second control chip U32, and the ACP end of the second control chip U32 is connected to the resistor R AC The ACN terminal of the second control chip U32 is connected to the resistor R AC The other end is connected to the capacitor C11 and the resistor R AC Phases are connected in parallel, and the ACN terminal is also grounded through capacitor C12;

[0108] The gate of the third switch tube Q4 is connected to the first output terminal of the second control chip U32 through the resistor R11 and is connected to the ACDRV port;

[0109] The gate of the fourth switch tube Q5 is connected to the third output terminal BATDRV of the second control chip U32 through the resistor R14.

[0110] By using the fourth switch tube Q5, when the network cable is supplying power, the fourth switch tube Q5 can be controlled to be turned off to prevent the current output from the secondary side of the transformer T2 from directly entering the target device;

[0111] At the same time, the third switch tube Q4 can prevent current backflow when the standard power supply BAVT is used for power supply, thereby achieving an anti-reverse effect.

[0112] At the same time, the PVCC end of the second control chip U32 is grounded through the capacitor C4, and the PVCC end is also connected to the source of the fourth switch tube Q5. The BTST end of the second control chip U32 is connected to the SW end of the second control chip U32 through the capacitor C5, and the RENG end of the second control chip U32 is grounded through the capacitor C6. The PGND port and the PAD port of the second control chip U32 are also grounded. The VREF port of the second control chip U32 is grounded through the capacitor C2, and the VREF port is also connected to the ISET end of the second control chip U32 through the resistor R2, and the ISET end is also grounded through the resistor R3; the TTC port on the second control chip U32 is grounded through the capacitor C3, the TS port on the second control chip U32 is grounded through the resistor R9, and the STAT port on the second control chip U32 is grounded through the diode D3, the resistor R10, the resistor R8 and the resistor R9 in sequence, and the TS port is also connected between the above-mentioned resistors R8 and R9.

[0113] After adopting the above scheme, combined with Figure 2as well as Fig.11 As shown:

[0114] The network cable is connected through the network interface RJ45, and connected to the Ethernet transformer T55 through the information output port in the network interface RJ45 to continue transmission, while the power supply in the network cable is connected to the first rectifier bridge D2 and the second rectifier bridge D3 through the idle line end in the network interface RJ45 and the data line end in the Ethernet transformer T55 for rectification, and after common-mode choke filtering, it is connected to the POE protocol chip, that is, the first control chip U1.

[0115] The first output terminal VDD pin of the first control chip U1 is the power input pin, and the DET terminal is the detection pin. Both are connected to the filtered voltage. On the one hand, they are used to power the first control chip, and on the other hand, they are used to detect whether there is a network cable that meets the POE standard. After the detection is successful, the CLASS terminal of the first control chip U1 performs the power classification of the POE protocol and is set to the third power level of the POE protocol. At this point, the POE protocol matching is completed, and the POE voltage is successfully output to 48v. This power supply is partially connected to the PRI1 and PRI2 terminals of the isolation transformer T2.

[0116] The GATE port of the first control chip U1 is used to control voltage conversion. The GATE port controls the transformation ratio of the isolation transformer T2 through the connected first switch tube Q2 to convert the above 48v voltage into 12v. This 12v voltage is connected to the mobile phone charging chip part through the interface J20. The mobile phone charging chip part is Fig.11 The circuit portion shown.

[0117] The 12v power supply converted by the POE protocol part is connected to the mobile phone charging chip, that is, the second control chip U32. The AVCC port of the second control chip U32 is the power input pin, which is connected to the above-mentioned 12V power supply and the standard power supply VBAT at the same time. When the network cable is connected for power supply, the chip is maintained to operate normally through this power supply, and when there is no network cable power supply, the standard power supply VBAT is used for power supply. After the 12v power supply converted by the POE protocol part is connected, the OVPSET end of the second control chip U32 will perform voltage detection. If it is 12v, the second control chip U32 starts to work. If it is higher than 12v, it means that there is a problem with the conversion of the POE protocol part, and the second switch tube Q3 and the third switch tube Q4 are turned off through the ACDRV port to prevent the power supply greater than 12v from being connected to the battery. After the second control chip U32 works normally, it uses its internal transformer to convert the above-mentioned 12V power supply into a charging power supply supported by the mobile phone and input it into the output interface JP201 for charging.

[0118] POE network-powered mobile phone charging devices can increase the applicable scenarios of mobile phone charging devices. Traditional mobile phone chargers can only be used in an environment with 220V mains power. If there is no mains power access, the mobile phone cannot be charged. In some environments such as corporate computer rooms, chargers are not allowed to be brought in, or if all mains power sockets are fully connected, the mobile phone cannot be charged. Mobile phone charging devices powered by POE networks can meet the above scenarios. Since they are no longer limited to mains power supply, mobile phone charging devices powered by POE networks have a wider range of applicable scenarios. Whether in offices, homes or outdoor environments, as long as there is POE network coverage, mobile phones can be conveniently charged. This wide range of applicability enables charging devices to better meet people's charging needs in different scenarios. Mobile phone charging devices powered by POE networks also have significant advantages in safety. Since power is transmitted through network cables, the risk of safety accidents caused by charger failure or short circuit is reduced. At the same time, the network power supply system has protection functions such as overcurrent, overvoltage, and overtemperature, which can effectively prevent safety problems caused by abnormal conditions during charging. In special scenarios such as computer rooms, mobile phones can be charged conveniently via network cables, which complies with relevant safety requirements. There is no need to leave the working environment for charging, which can significantly improve work efficiency.

[0119] The utility model also provides a charging conversion device, comprising the above-mentioned network-powered circuit.

[0120] By using this device, you can connect to a network cable through the network interface on the device, and connect to a target device through the output interface on the device, so as to charge the target device through the network cable, meeting the charging needs of users in special environments.

[0121] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A network-powered circuit, characterized in that: include: A network interface, an Ethernet transformer, a rectifier module, a first control module, a transformer, a second control module and an output interface, wherein: The information output end of the network interface is connected to the information receiving end of the Ethernet transformer, and the idle line end in the network interface and the data line end in the Ethernet transformer are simultaneously connected to the input end of the rectifier module; The first output end of the rectifier module is connected to the first input end of the first control module and one end of the primary side of the transformer, and the other end of the rectifier module is grounded; The output end of the first control module is connected to the other end of the primary side of the transformer to control the transformation ratio of the transformer; The secondary side of the transformer is connected to the output interface through the second control module.

2. A network-powered circuit according to claim 1, characterized in that: The first control module includes a first control chip and a first switch tube, wherein: The first output terminal of the rectifier module is connected to the first input terminal of the first control chip; The output end of the first control chip is connected to the control end of the first switch tube, and the other end of the primary side of the transformer is grounded through the input end of the first switch tube and the output end of the first switch tube in sequence.

3. A network-powered circuit according to claim 2, characterized in that: It also includes a common-mode choke, and the first output end of the rectifier module is connected to the first input end of the first control chip and one end of the primary side of the transformer through one end of the common-mode choke, and the second output end of the rectifier module is grounded through the other end of the common-mode choke.

4. A network-powered circuit according to claim 3, characterized in that: include: The second input end of the first control chip is connected to the other end of the common mode choke coil.

5. A network-powered circuit according to claim 1, characterized in that: The second control module includes a second control chip and a second switch tube, wherein: The secondary side of the transformer is connected to the first input end of the second control chip through the input end of the second switch tube and the output end of the second switch tube in sequence; The first output terminal of the second control chip is connected to the output interface; The control end of the second switch tube is connected to the second output end of the second control chip.

6. A network-powered circuit according to claim 5, characterized in that: The second input terminal of the second control chip is connected to the secondary side of the transformer.

7. A network-powered circuit according to claim 6, characterized in that: It also includes a standard power supply, and the power input terminal of the second control chip is connected to the standard power supply and the secondary side of the transformer at the same time.

8. A network-powered circuit according to claim 7, characterized in that: It also includes a third switch tube and a fourth switch tube, wherein: The standard power supply is connected to the input end of the fourth switch tube, the output end of the fourth switch tube is connected to the input end of the third switch tube, and the output end of the third switch tube is connected to the first input end of the second control chip; The control end of the third switch tube is connected to the first output end of the second control chip; The control end of the fourth switch tube is connected to the third output end of the second control chip.

9. A network-powered circuit according to claim 1, characterized in that: The rectifier module includes a first rectifier bridge and a second rectifier bridge, wherein: The input end of the first rectifier bridge is connected to the idle line end in the network interface; The input end of the second rectifier bridge is connected to the data line end of the Ethernet transformer; The first output end of the first rectifier bridge is connected to the first output end of the second rectifier bridge to serve as the first output end of the rectifier module, and the second output end of the first rectifier bridge is connected to the second output end of the second rectifier bridge to serve as the second output end of the rectifier module.

10. A charging conversion device, characterized in that: The invention comprises a network-powered circuit as claimed in any one of claims 1 to 9.

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