CN209930147U - Ethernet power supply device - Google Patents
Ethernet power supply device Download PDFInfo
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- CN209930147U CN209930147U CN201920939451.XU CN201920939451U CN209930147U CN 209930147 U CN209930147 U CN 209930147U CN 201920939451 U CN201920939451 U CN 201920939451U CN 209930147 U CN209930147 U CN 209930147U
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Abstract
The utility model relates to a power supply device of ethernet contains: the double-switch flyback type electric energy input module inputs electric energy to an input winding of a voltage conversion unit; the power supply output module is electrically connected with a first output winding of the voltage conversion unit to receive induction electric energy and output power supply voltage; a signal power supply output module is electrically connected with the second output winding of the voltage conversion unit to receive induction electric energy and output a signal power supply voltage, and the grounding end of the power supply output module is not grounded with the grounding end of the signal power supply output module; two groups of voltages are output through two groups of output windings on one voltage conversion unit, and the two output modules are not in common ground to be mutually isolated and reduce interference, thereby further achieving the purpose of reducing the complexity and the cost of the circuit.
Description
Technical Field
A power supply device, and more particularly, to an ethernet power supply device.
Background
The Power Over Ethernet (POE) system transmits information and Power simultaneously through a cable, i.e. transmits data and Power simultaneously through the same transmission line, so as to reduce the complexity of installation and connection and save the construction cost. In order to achieve power supply stability, generally, the ethernet power module as a power supply terminal must isolate a signal power supply path and an electric power supply path from each other to reduce interference. Therefore, the conventional ethernet power supply module generally has a power input terminal, a first power conversion module and a second power conversion module, wherein the first power conversion module and the second power conversion module are electrically connected to a power device through the power input terminal to receive an input power, the first power conversion module is used as a power supply path for the signal, and has a first transformer for converting the input power into a signal power supply voltage required by a data transmission terminal. The second power supply conversion module is used as a path for supplying electric power and is provided with a second transformer for converting the input power supply into electric power supply voltage required by an electric power supply end. The data transmission terminal and the electric power supply terminal are connected to a power receiving device through an Ethernet cable to provide data and power to the power receiving device.
As can be seen from the above description, the conventional power over ethernet module has two independent voltage conversion modules, which results in complex circuit, large number of components and high cost. Therefore, the ethernet power supply device in the prior art needs to be further improved.
SUMMERY OF THE UTILITY MODEL
In view of the fact that current ethernet power supply system contains two independent power conversion modules and provides electrical separation's signal power supply and electric power supply simultaneously, leads to the circuit complicacy and component quantity many, the utility model provides an ethernet power supply device contains a pair of switch flyback electric energy input module, a voltage conversion unit, a power supply output module and a signal power supply output module. The voltage conversion unit comprises an input winding, a first output winding and a second output winding, the double-switch flyback electric energy input module is provided with two alternating current input ends, a first power output end and a second power output end, and the input winding is electrically connected between the first power output end and the second power output end of the double-switch flyback electric energy input module; the power supply output module is provided with two first input ends, a power supply output end and a first grounding end, and the first output winding is electrically connected between the two first input ends; the signal power supply output module is provided with two second input ends, a signal power supply output end and a second grounding end, and the second output winding is electrically connected between the two second input ends. Further, the first ground terminal and the second ground terminal are not grounded in common.
The first output winding, the second output winding and the third output winding are wound on the same iron core of the voltage transformation unit, the first output winding and the second output winding respectively form two secondary sides of the voltage transformation unit and are coupled with the input winding respectively so as to form a voltage converter with the input winding respectively, and the voltage converter respectively supplies power to the output voltage of the output module and the output rated voltage of the power supply output module according to the signal to output electric energy. The first grounding end of the signal power supply output module and the second grounding end of the power supply output module are not grounded, so that the signal power supply output module and the power supply output module are prevented from interfering with each other, and stable output is achieved.
Furthermore, the primary side of the Ethernet power supply device uses a double-switch flyback type electric energy input module, the turn-off voltage of a power switch in the electric energy input module is reduced, the danger that the power switch is damaged due to overhigh flyback voltage of the primary side when a voltage output load is in light load is avoided, flyback electric energy is further fed back to the input power supply, and the input voltage receiving range and the whole power supply conversion efficiency of the Ethernet power supply device are improved.
That is to say, the ethernet power supply device can obtain two groups of mutually isolated and stable output voltages without arranging two groups of separated power converters, and respectively provide a signal power supply and a power supply for power supply, thereby achieving the purposes of reducing the circuit topology complexity and the manufacturing cost of the ethernet power supply device, improving the power density of power conversion and the volume of the power supply device, and still outputting two groups of stable voltages.
Drawings
Fig. 1 is a schematic diagram of a circuit block of the ethernet power supply device of the present invention.
Fig. 2 is a circuit diagram of the ethernet power supply device according to the first preferred embodiment of the present invention.
Fig. 3 is a circuit diagram of a second preferred embodiment of the ethernet power supply device of the present invention.
Fig. 4 is a schematic diagram of an equivalent circuit of the ethernet power supply apparatus according to the fourth preferred embodiment of the present invention.
Detailed Description
The following description of the preferred embodiments of the present invention will be made in conjunction with the drawings and the accompanying drawings to further illustrate the technical means adopted to achieve the objects of the present invention.
Referring to fig. 1, the ethernet power supply device of the present invention includes a dual-switch flyback power input module 10, a voltage conversion unit T, a power supply output module 20, and a signal power supply output module 30.
The voltage conversion unit T includes an input winding N11, a first output winding N21 and a second output winding N22, the dual-switch flyback power input module 10 has two AC input terminals AC1, AC2, a first power output terminal N1 and a second power output terminal N2, the input winding N11 is electrically connected between the first power output terminal N1 and the second power output terminal N2 of the dual-switch flyback power input module 10; the power supply output module 20 has two first input terminals IP11, IP12, a power supply output terminal OP1 and a first ground terminal gnd1, the first output winding N21 is electrically connected between the two first input terminals IP11, IP 12; the signal power output module 30 has two second input terminals IP21, IP22, a signal power output terminal OP2 and a second ground terminal gnd2, and the second output winding N22 is electrically connected between the two second input terminals IP21 and IP 22. Further, the first ground gnd1 is not grounded to the second ground gnd 2.
The power supply output module 20 receives the induced voltage output by the first output winding N21, and generates a power supply output voltage to be output by the power supply output terminal OP1, where the power supply output voltage is used for supplying power to the ethernet power supply device, and the power supply output voltage is, for example, an output voltage of 12V; the signal power output module 30 receives the induced voltage outputted by the second output winding N22, and generates a signal power output voltage outputted by the signal power output terminal OP2, the signal power output voltage is supplied to the signal power of the ethernet power supply device, and the signal power output voltage is, for example, an output voltage of 54V.
Referring to fig. 2, in a first preferred embodiment of the present invention, the dual-switch flyback power input module 10 includes a rectifying unit 11, a first input switch Q1, a second input switch Q2, a first diode D1, and a second diode D2, the rectifying unit 11 is electrically connected to the two AC input terminals AC1 and AC2, and has a first rectifying output terminal DC1 and a second rectifying output terminal DC2, the first input switch Q1 is electrically connected between the first rectifying output terminal DC1 and the first power output terminal n1, and the second switch Q2 is electrically connected between the second rectifying output terminal DC2 and the second power output terminal n 2. The first diode D1 has a cathode electrically connected to the first rectified output terminal DC1 and an anode electrically connected to the second power output terminal n 2; the second diode D2 also has a cathode and an anode, the cathode of the second diode D2 is electrically connected to the first power output terminal n1, and the anode of the second diode D2 is electrically connected to the second rectified output terminal DC 2.
When the first input switch Q1 and the second input switch Q2 are turned on, the dc voltage source output by the rectifying unit 11 stores the electric energy in the input winding N11 through the first input switch Q1 and the second input switch Q2 to be stored in the magnetic circuit of the voltage converting unit T; when the first input switch Q1 and the second input switch Q2 are not turned on to form an open circuit, the electric energy stored in the voltage conversion unit T is transmitted to the power supply output module 20 and the signal supply output module 30 through the first output winding N21 and the second output winding N22, and the current on the input winding N11 continuously flows through the first diode D1 and the second diode D2, so that the flyback leakage inductance voltage is released back to the power supply through the first diode D1 and the second diode D2 by the input winding N11, thereby improving the efficiency of the overall power conversion.
Referring to fig. 3, in a second preferred embodiment of the present invention, the power supply output module 20 includes a feedback unit 21 electrically connected between the power supply output terminal OP1 and the first ground terminal gnd1, and the feedback unit 21 generates a feedback signal according to the voltage of the power supply output terminal OP 1. Further, the dual-switch flyback power input module 10 includes a control unit 12 electrically connected to the feedback unit 21 for receiving the feedback signal, and controlling the voltage input to the voltage conversion unit T by the dual-switch flyback power input module 10 according to the feedback signal, so that the power supply output voltage of the power supply output terminal OP1 is stabilized within a power supply voltage interval. Preferably, the dual-switch flyback power input module 10 forms a flyback power converter with the power supply output module 20 through the voltage conversion unit T.
Further, the signal-powered output module 30 includes a linear regulator 31 electrically connected between the two second input terminals IP21 and IP22 of the signal-powered output module 30 and the signal-powered output terminal OP 2. The linear voltage regulator 31 receives the induced voltage output by the second output winding N22, performs a linear voltage stabilization, generates a signal power supply output voltage, and outputs the signal power supply output voltage from the signal power supply output terminal OP2, so that the signal power supply output voltage is stabilized within a preset signal power supply voltage interval.
In the preferred embodiment, the power supply output voltage of the power supply output module 20 generates the feedback signal to the control unit 12 of the dual-switch flyback power input module 10, so as to regulate the power input from the dual-switch flyback power input module 10 to the input winding N11, so as to stabilize the output voltage of the power supply output module 20; the signal power output module 30 receives the induced voltage of the second output winding N22, and outputs a stable signal power voltage from the signal power output terminal OP2 after stabilizing the induced voltage of the second output winding N22 by the voltage stabilizing function of the linear voltage regulator 31. For example, when the power supply output terminal OP1 is overloaded, the dual-switch flyback power input module 10 increases the input power inputted from the input winding N11 to the power conversion unit according to the feedback signal, so that the induced voltage of the second output winding N22 increases together, the linear regulator 31 of the signal power output module 30 starts to operate to step down the induced voltage of the second output winding N22, so as to output an output voltage stabilized in the signal power output voltage interval. Similarly, the dual-switch flyback power input module 10 and the power supply output module 20 form a flyback power converter through the voltage conversion unit T.
As shown in fig. 3, preferably, the power supply output module 20 includes a first output diode Dout1 and a first output capacitor Cout1, the first output diode Dout1 is electrically connected between a first input terminal IP11 and the power supply output terminal OP1, and the first output capacitor Cout1 is electrically connected between the power supply output terminal OP1 and the first ground terminal gnd 1. The signal-powered output module 30 includes a second output diode Dout2 and a second output capacitor Cout2, the linear regulator 31 is electrically connected to one of the second input terminals IP21 through the second output diode Dout2, and the second output capacitor Cout2 is electrically connected between the signal-powered output terminal OP2 and the second ground terminal gnd 2.
In a third preferred embodiment of the present invention, the linear regulator 31 includes a voltage stabilizing switch M1 and a voltage stabilizing control unit 311, the voltage stabilizing switch M1 is electrically connected between one end of the second output diode Dout2 and the signal power supply output end OP2, and the voltage stabilizing switch M1 has a control end; the voltage regulation control unit 311 is electrically connected to the signal power output terminal OP2 and the control terminal of the voltage regulation switch M1, and regulates a driving voltage provided to the control terminal according to the signal power output voltage of the signal power output terminal OP 2. For example, when the signal power supply output voltage is greater than a reference voltage value of the regulator control unit 311, the regulator control unit 311 decreases the driving voltage, so that the conduction level of the regulator switch M1 decreases, the voltage drop across the regulator switch M1 increases, and the voltage at the signal power supply output terminal OP2 decreases and returns to the power supply voltage range.
In a fourth preferred embodiment of the present invention, the voltage regulation control unit 311 includes a first voltage-dividing resistor Rd1, a second voltage-dividing resistor Rd2, a first zener diode ZD1, and a voltage-stabilizing element TL. The first voltage dividing resistor Rd1 and the second voltage dividing resistor Rd2 are connected in series between the signal power supply output end OP2 and the second ground terminal gnd2, the first zener diode ZD1 has an anode and a cathode, the cathode of the first zener diode ZD1 is connected to the control end of the voltage stabilizing switch M1, the voltage stabilizing element TL is electrically connected between the anode of the first zener diode ZD1 and the second ground terminal gnd2 and has a control end, and the control end of the voltage stabilizing element TL is electrically connected to the connection point of the first voltage dividing resistor Rd1 and the second voltage dividing resistor Rd2 to receive a divided voltage of the signal power supply output voltage. When the signal power supply output voltage exceeds an upper limit of the signal power supply voltage interval, so that the control terminal voltage of the voltage regulator device TL is greater than the reference voltage, the voltage regulator device TL conducts the anode of the first zener diode ZD1 and the second ground gnd 2.
Preferably, the signal power output module 30 further includes a driving voltage unit 32. The second output winding N22 includes a first end and a second end opposite to each other, and a center tap end, two second input ends IP21 and IP22 of the signal supply output module 30 are electrically connected to the center tap end and the second end, and the driving voltage unit is electrically connected between the first end and the control end of the regulator switch M1, so that the first end of the second output winding N22 provides a driving voltage to the control end of the regulator switch M1.
When the voltage value of the signal power supply output voltage is within the signal power supply voltage interval, the voltage provided by the first voltage dividing resistor Rd1 and the second voltage dividing resistor Rd2 to the control end of the voltage stabilizing element TL is lower than the reference voltage value, and the voltage stabilizing element TL is not conducted, so that an open circuit is formed between the control end of the voltage stabilizing switch M1 and the second ground end gnd2, the voltage of the control end of the voltage stabilizing switch M1 is equal to the driving voltage provided by the driving voltage unit, the voltage stabilizing switch M1 is in a conducting state, and the voltage of the second output winding N22 is provided to the signal power supply output end OP 2; when the signal power supply output voltage exceeds the upper limit value of the signal power supply voltage interval, so that the control terminal voltage provided to the voltage regulator device TL by the divided voltage of the first and second voltage divider resistors Rd2 is greater than the reference value, the voltage regulator device TL turns on the anode of the first zener diode ZD1 and the second ground gnd2, so that the first zener diode ZD1 is breakdown-turned on by the reverse bias of the driving voltage, and turns on between the control terminal of the zener switch M1 and the second ground gnd2, the control terminal of the zener switch M1 is at the same potential as the second ground gnd2, the conduction degree of the zener switch M1 decreases and the voltage drop between the two opposite terminals increases, so that the output voltage of the signal power supply output terminal OP2 decreases back to the signal power supply voltage interval.
Preferably, the driving voltage unit includes a third diode D3, a first resistor R1, a second resistor R2, a power switch M2 and a second zener diode ZD2, the third diode D3 has a cathode and an anode, the anode is electrically connected to the first end of the second output winding N22; the power supply switch M2 has an input terminal, an output terminal and a control terminal, the input terminal is electrically connected to the cathode of the third diode D3, the output terminal is electrically connected to the control terminal of the voltage stabilizing switch M1 through the first resistor R1, and the second resistor R2 is electrically connected between the input terminal and the control terminal of the power supply switch M2; the second zener diode ZD2 has a cathode and an anode, the anode of the second zener diode ZD2 is electrically connected to the connection node of the second output diode Dout2 and the voltage stabilizing switch M1, and the cathode of the second zener diode ZD2 is electrically connected to the control terminal of the power supply switch M2.
The voltage regulator element TL is preferably a three-terminal adjustable voltage regulator, model TL 431. Referring to fig. 4, fig. 4 shows an equivalent circuit of the voltage stabilizing element TL. The voltage-stabilizing element TL includes a voltage-controlled switch M3, a comparator OP and a comparison voltage source Vref. The voltage-controlled switch M3 is electrically connected between the anode of the first zener diode ZD1 and the second ground gnd2, and has a control end, a positive input end of the comparator OP is electrically connected to the connection point of the first voltage-dividing resistor Rd1 and the second voltage-dividing resistor Rd2, a negative input end of the comparator OP is electrically connected to the comparison voltage source Vref, and an output end of the comparator OP is electrically connected to the voltage-controlled switch and the control end of M3. The positive input terminal of the comparator OP is the control terminal of the voltage-stabilizing element TL. The comparator compares the partial voltage of the output voltage supplied by the signal provided by the first voltage dividing resistor Rd1 and the second voltage dividing resistor Rd2 with the voltage of the comparison voltage source Vref, when the partial voltage is greater than the comparison voltage source voltage Vref, the output end of the comparator OP outputs a high potential, the voltage-controlled switch M3 is conducted between the anode of the first zener diode ZD1 and the second ground terminal gnd2, the first zener diode ZD1 is broken and conducted by the reverse bias of the driving voltage, so that the control end of the zener switch and M1 is equal to the second ground terminal gnd2, and the conduction degree of the zener switch M1 is reduced; when the divided voltage is smaller than the voltage of the comparison voltage source Vref, the output terminal of the comparator OP outputs a low potential, the voltage controlled switch M3 is not turned on, the anode of the first zener diode ZD1 and the second ground gnd2 are open-circuited, the control terminal voltage of the voltage stabilizing switch M1 is the driving voltage provided by the driving unit 32, and the voltage stabilizing switch M1 is turned on.
In summary, by controlling the coil turn ratio of the input winding N11, the first output winding N21 and the second output winding N21, and by the feedback control from the feedback unit 21 of the power supply output module 20 to the dual-switch flyback input module 10, the voltage at the power supply output end OP1 is stabilized within the power supply voltage range; further, the feedback voltage provided by the signal supply output voltage to the control terminal of the voltage stabilizing element TL is controlled by controlling the resistance ratio of the first voltage dividing resistor Rd1 and the second voltage dividing resistor Rd2, and the voltage stabilizing range of the linear voltage regulator 31 to the signal supply output terminal OP2 is set, so as to ensure that the signal supply output voltage is within the signal supply voltage range.
Preferably, the resistance ratio of the first voltage-dividing resistor Rd1 and the second voltage-dividing resistor Rd2 is set according to the rated voltage of the power supply output terminal OP1, the rated voltage of the signal supply output terminal OP2 and the signal supply voltage interval, so that the voltage-stabilizing switch M1 in the linear voltage regulator TL is maintained in a fully open conducting state under most normal conditions; only when the load of the power supply output terminal OP1 is a heavy load and the signal supply output terminal OP2 is a light load, the voltage of the signal supply output terminal OP2 is higher than the upper limit of the signal supply voltage interval, so that the voltage of the control terminal of the voltage stabilizing element 311 is further higher than the Vref, and the turn-on degree of the voltage stabilizing switch M1 is further reduced, so that the voltage of the signal supply output terminal OP2 is reduced. That is, in most cases, the conduction loss of the voltage regulator switch M1 is very low, so as to maintain the conversion efficiency of the signal power supply output module; only under the extreme conditions that the power supply output module 20 is under heavy load and the signal supply output module 30 is under light load, the voltage output by the signal supply output terminal OP2 exceeds the upper limit of the signal supply voltage interval, so that the conventional voltage stabilizer TL operates, the voltage drop across the voltage stabilizing switch M1 rises, and the voltage of the signal supply output terminal OP2 is reduced; in this situation, since the load of the signal power output module 30 is light, the loss of the voltage regulator switch M1 is very low, so as to ensure the low loss rate of the signal power output terminal and the power output terminal of the ethernet power supply device under any load combination.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention has been disclosed with the preferred embodiment, it is not limited to the present invention, and any skilled person can make modifications or changes equivalent to the equivalent embodiment without departing from the scope of the present invention, but all the technical matters of the present invention are within the scope of the present invention.
Claims (10)
1. An ethernet power supply apparatus, comprising:
the double-switch flyback type electric energy input module is provided with two alternating current input ends, a first power supply output end and a second power supply output end, wherein the two alternating current input ends are used for being electrically connected with an alternating current power supply;
the voltage conversion unit comprises an input winding, a first output winding and a second output winding, wherein the first output winding and the second output winding are respectively coupled with the input winding, and the input winding is electrically connected between two power supply output ends of the double-switch flyback type electric energy input module;
the power supply output module is provided with two first input ends, a power supply output end and a first grounding end, and the first output winding is electrically connected between the two first input ends;
a signal power supply output module having two second input terminals, a signal power supply output terminal and a second ground terminal, the second output winding being electrically connected between the two second input terminals;
the first ground terminal and the second ground terminal are not grounded in common.
2. The ethernet power supply apparatus according to claim 1, wherein the dual-switch flyback power input module comprises:
a rectifying unit electrically connected with the two AC input ends and provided with a first rectifying output end and a second rectifying output end;
a first input switch electrically connected between the first rectification output end and the first power supply output end;
a second input switch electrically connected between the second rectification output end and the second power supply output end;
the first diode is provided with a cathode and an anode, the cathode of the first diode is electrically connected with the first rectification output end, and the anode of the first diode is electrically connected with the second power supply output end;
a second diode having a cathode and an anode, wherein the cathode of the second diode is electrically connected to the first power output terminal, and the anode of the first diode is electrically connected to the second rectification output terminal.
3. The Ethernet power supply apparatus of claim 1,
the power supply output module includes:
a feedback unit electrically connected between the power supply output terminal and the first ground terminal, the feedback unit generating a feedback signal according to the output voltage of the power supply output terminal;
this two switch flyback power input modules include:
the control unit is electrically connected with the feedback unit, receives the feedback signal and controls the voltage input to the voltage conversion unit by the double-switch flyback type electric energy input module according to the feedback signal so that the power supply output voltage output by the power supply output end is stabilized within a power supply voltage interval; the double-switch flyback type electric energy input module and the power supply output module form a flyback type power converter through the voltage conversion unit.
4. The Ethernet power supply apparatus of claim 3, wherein the power supply output module further comprises:
a first output diode electrically connected between a first input terminal and the power supply output terminal;
a first output capacitor electrically connected between the power supply output terminal and the first ground terminal.
5. The ethernet power supply apparatus according to claim 1, wherein the signal power output module comprises:
a linear voltage stabilizer electrically connected between the two second input ends of the signal power supply output module and the signal power supply output end, the linear voltage stabilizer receiving an induction voltage of the second output winding, performing a linear voltage stabilization to generate a signal power supply voltage and outputting the signal power supply voltage from the signal power supply output end;
the double-switch flyback type electric energy input module and the signal power supply output module form a flyback type power converter through the voltage conversion unit.
6. The Ethernet power supply apparatus of claim 5, wherein the signal power output module comprises:
a second output diode, wherein the linear regulator is electrically connected to a second input terminal through the second output diode;
a second output capacitor electrically connected between the signal power supply output terminal and the second ground terminal; wherein, the second output diode is electrically connected with the signal power supply output end through the linear voltage regulator.
7. The Ethernet power supply apparatus of claim 6, wherein the linear regulator comprises:
a voltage stabilizing switch having a control terminal; the second output diode is electrically connected with the signal power supply output end through the voltage stabilizing switch;
and the voltage stabilizing control unit is electrically connected with the control end of the voltage stabilizing switch and the signal power supply output end and regulates and controls a driving voltage provided to the control end of the voltage stabilizing switch according to the signal power supply voltage.
8. The ethernet power supply apparatus of claim 7, wherein the voltage regulation control unit comprises:
a first voltage dividing resistor and a second voltage dividing resistor connected in series between the second output terminal and the second ground terminal;
a first Zener diode having an anode and a cathode, the cathode being electrically connected to the control terminal of the voltage regulator switch;
a voltage-stabilizing element electrically connected between the anode of the first Zener diode and the second ground terminal and having a control terminal; wherein,
the connection joint of the first voltage-dividing resistor and the second voltage-dividing resistor is electrically connected with the control end of the voltage-stabilizing element;
when the voltage of the control end of the voltage stabilizing element exceeds a reference voltage, the voltage stabilizing element is conducted, so that the anode of the first Zener diode is electrically connected with the second grounding end.
9. The ethernet power supply apparatus of claim 8, wherein the linear regulator further comprises:
a driving voltage unit; wherein,
the second output winding comprises a first end and a second end which are opposite, and a central tap end; wherein,
the central tap end and the second end are electrically connected with two second input ends of the signal power supply output module, the driving voltage unit is electrically connected between the first end and the control end of the voltage stabilizing switch, and the driving voltage unit provides a driving voltage to the control end of the forward voltage switch from the first end of the second output winding.
10. The ethernet power supply apparatus according to claim 9, wherein the driving voltage unit comprises:
a third diode having a cathode and an anode, the anode of the third diode being electrically connected to the first end of the second output winding;
a first resistor;
a second resistor;
a power supply switch having an input terminal, an output terminal and a control terminal, wherein the input terminal is electrically connected to the cathode of the third diode, the output terminal is electrically connected to the control terminal of the voltage stabilizing switch through the first resistor, and the second resistor is electrically connected between the input terminal and the control terminal of the power supply switch;
a second Zener diode having a cathode and an anode, the anode of the second Zener diode is electrically connected to the connection point of the second output diode and the voltage stabilizing switch, and the cathode of the second Zener diode is electrically connected to the control terminal of the power supply switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920939451.XU CN209930147U (en) | 2019-06-21 | 2019-06-21 | Ethernet power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920939451.XU CN209930147U (en) | 2019-06-21 | 2019-06-21 | Ethernet power supply device |
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| CN209930147U true CN209930147U (en) | 2020-01-10 |
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| CN201920939451.XU Active CN209930147U (en) | 2019-06-21 | 2019-06-21 | Ethernet power supply device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115085555A (en) * | 2022-05-20 | 2022-09-20 | 荣耀终端有限公司 | Power supply circuit and power adapter |
| CN118868641A (en) * | 2024-09-26 | 2024-10-29 | 浙江大华技术股份有限公司 | Flyback power supply circuit, Ethernet power supply system and electronic equipment |
-
2019
- 2019-06-21 CN CN201920939451.XU patent/CN209930147U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115085555A (en) * | 2022-05-20 | 2022-09-20 | 荣耀终端有限公司 | Power supply circuit and power adapter |
| CN118868641A (en) * | 2024-09-26 | 2024-10-29 | 浙江大华技术股份有限公司 | Flyback power supply circuit, Ethernet power supply system and electronic equipment |
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