CN218102580U - Double-input-end anti-reverse-filling circuit for adapter and USB equipment - Google Patents
Double-input-end anti-reverse-filling circuit for adapter and USB equipment Download PDFInfo
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- CN218102580U CN218102580U CN202222000498.4U CN202222000498U CN218102580U CN 218102580 U CN218102580 U CN 218102580U CN 202222000498 U CN202222000498 U CN 202222000498U CN 218102580 U CN218102580 U CN 218102580U
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Abstract
The utility model discloses a circuit is prevented irritating to dual input end of adapter and USB equipment, this circuit includes: the device comprises a first power input module, a second power input module and an anti-reverse-irrigation module; the reverse-filling prevention module comprises a first resistor, a second resistor, a first MOS (metal oxide semiconductor) tube, a second MOS tube, a first capacitor and a first diode, wherein the drain electrode of the first MOS tube is connected with the anode of the first diode, the voltage of the first power input module acts on the main system through the source electrode of the first MOS tube through the first diode, and the first diode prevents the voltage of the main system from being reversely filled into the first power input module; the grid electrode of the second MOS tube is connected with the output end of the first power input module through the first resistor serving as a pull-up resistor, the second power input module is connected with the source electrode of the second MOS tube, and the second MOS tube is turned off when the output voltage of the first power input module is too high, so that the circuit is protected.
Description
Technical Field
The utility model relates to the field of electronic technology, especially, relate to a circuit is prevented irritating to double input end of adapter and USB equipment.
Background
At present, many electronic devices can simultaneously support adapter power supply and USB power supply, and mutual interference or reverse flow among multiple power supplies can cause circuit burnout. The prior art adopts an anti-reverse-filling circuit to solve the problem, but the existing anti-reverse-filling circuit can only perform overvoltage protection in a fixed voltage range, and the service efficiency of a power supply is reduced due to the conduction voltage drop of a diode.
Disclosure of Invention
The utility model provides a circuit is prevented irritating to adapter and USB equipment's dual input end to solve and prevent at present that the circuit is prevented irritating and can't provide overvoltage protection at full voltage range, and because of the lower technical problem of power availability factor that the diode pressure drop leads to.
In order to solve the technical problem, the embodiment of the utility model provides a prevent flowing backward circuit to adapter and USB equipment's dual input end, include: the device comprises a first power input module, a second power input module and an anti-reverse-irrigation module;
the output end of the first power supply input module is connected with the first input end and the second input end of the reverse irrigation prevention module; the output end of the second power supply input module is connected with the third input end of the reverse irrigation prevention module; the first output end and the second output end of the reverse irrigation prevention module are respectively connected with the input end of the main system;
the anti-reverse-irrigation module specifically comprises a first resistor, a second resistor, a first MOS (metal oxide semiconductor) tube, a second MOS tube, a first capacitor and a first diode;
the source electrode of the first MOS tube is connected with the first input end of the reverse-filling prevention module and the first end of the first capacitor;
the grid electrode of the first MOS tube is connected with the second end of the first capacitor;
the drain electrode of the first MOS tube is connected with the anode of the first diode and the third output end of the reverse irrigation preventing module;
the negative electrode of the first diode is connected with the first output end of the reverse filling prevention module;
the grid electrode of the second MOS tube is connected with the first end of the first resistor and the first end of the second resistor;
the second end of the first resistor is connected with the second input end of the reverse irrigation prevention module;
the second end of the second resistor is grounded;
the source electrode of the second MOS tube is connected with the second input end of the reverse irrigation prevention module;
and the drain electrode of the second MOS tube is connected with the second output end of the reverse irrigation prevention module.
In the utility model, when the output voltage of the first power input module reaches the turn-on voltage of the first MOS tube, the first MOS tube is conducted and supplies power to the main system through the first diode, and the first diode prevents the back-filling phenomenon between the main system and the first power input module; when the two input ends supply power simultaneously and the output voltage of the first power input module is greater than the output voltage of the second power input module, the grid electrode of the second MOS tube is pulled to a high potential through the first resistor, so that the second MOS tube is in a turn-off state, and the reverse filling phenomenon between the first power input module and the second power input module is prevented.
Further, the first power input module comprises an adapter;
and the output end of the adapter is connected with the output end of the first power input module.
Further, the second power input module comprises a USB device;
and the output end of the USB equipment is connected with the output end of the second power input module.
Further, the anti-reverse-filling module further comprises: the first MOS transistor comprises a first resistor, a second resistor, a fourth resistor, a fifth resistor, a second capacitor, a first voltage regulator tube, a second voltage regulator tube and a third MOS tube;
the first end of the third resistor is connected with the grid electrode of the first MOS tube;
the second end of the third resistor is connected with the anode of the first voltage-regulator tube and the grid electrode of the third MOS tube;
the negative electrode of the first voltage-regulator tube is connected with the first end of the fourth resistor;
the second end of the fourth resistor is connected with the drain electrode of the first MOS tube, the source electrode of the third MOS tube and the cathode of the second voltage-regulator tube;
the anode of the second voltage-regulator tube is connected with the drain electrode of the third MOS tube, the first end of the fifth resistor, the first end of the second capacitor, the cathode of the first diode and the third output end of the reverse-flow prevention module.
The utility model discloses a source electrode of first MOS pipe is connected with the output of first output module, the drain electrode of first MOS pipe is connected with the source electrode of third MOS pipe, the source electrode of third MOS pipe is connected with first diode, guarantee that after applying the adapter voltage source, first MOS pipe and third MOS pipe switch on, the power acts on main system after first diode, and first diode has avoided the voltage of main system to irritate to first power input module backward; when the first power input module and the second power input module act simultaneously, the high voltage provided by the adapter power supply acts on the grid electrode of the second MOS tube, and the source electrode of the second MOS tube is connected with the USB equipment so that the second MOS tube is not conducted, thereby preventing the high voltage provided by the first power input module from reversely flowing to the second power input module; in addition, the second voltage-regulator tube is connected in parallel between the source electrode and the drain electrode of the third MOS tube so as to increase the conduction speed of the third MOS tube; and the first voltage-regulator tube is connected in parallel between the source electrode and the grid electrode of the third MOS tube and is used for preventing the third MOS tube from being damaged due to overhigh voltage between the source electrode and the grid electrode.
Further, the dual input end to adapter and USB equipment prevents flowing backward the circuit, still includes: the device comprises a control module, an input monitoring module and a voltage protection module;
wherein the control module has n output terminals; the voltage protection module is provided with n control ends;
the ith output end of the control module is connected with the ith control end of the voltage protection module; the input end of the voltage protection module is connected with the output end of the first power supply input module, the first output end of the voltage protection module is respectively connected with the first input end and the second input end of the reverse irrigation prevention module, and the second output end of the voltage protection module is connected with the fourth input end of the reverse irrigation prevention module; the input end of the input monitoring module is connected with the output end of the first power input module; wherein i is more than or equal to 1 and less than or equal to n.
Wherein, the voltage protection module specifically includes: the power supply comprises a sixth resistor, an ith control switch, an ith voltage stabilizing protection diode and a first triode;
the first end of the sixth resistor is connected with the first output end of the voltage protection module and the emitting electrode of the first triode;
the second end of the sixth resistor is connected with the first end of the ith control switch and the base electrode of the first triode;
the second end of the ith control switch is connected with the negative electrode of the ith voltage-stabilizing protection diode;
the third end of the ith control switch is connected with the ith control end of the voltage protection module;
the positive electrode of the ith voltage-stabilizing protection diode is grounded;
and the collector of the first triode is connected with the second output end of the voltage protection module and the circuit ground.
The utility model discloses a let input monitoring module connect first power input module's output, make first power input module's output voltage's voltage range can be by real-time supervision, after monitoring first power input module's output voltage, again according to control module's output and voltage protection module's control end be connected, through control module's output with control signal transmission to voltage protection module's control end, with the control switch closure that the voltage range corresponds, insert corresponding stabilivolt, make the first triode open when the voltage is too high, the pressure differential between first triode projecting pole and the collecting electrode is close to 0V, thereby make the voltage Vgs between the source electrode of the first MOS pipe of being connected with and the grid be close to 0V, turn-off because of unsatisfying the condition of opening; and then the second MOS tube is also turned off, thereby enlarging the input voltage and the protection range aiming at the input voltage.
Further, the voltage protection module includes: a seventh resistor and an eighth resistor;
the first end of the seventh resistor is connected with the second end of the sixth resistor and the first end of the ith control switch;
the second end of the seventh resistor is connected with the base electrode of the first triode;
the first end of the eighth resistor is connected with the collector of the first triode;
and the second end of the eighth resistor is grounded.
Further, the input monitoring module includes a ninth resistor and a tenth resistor;
the first end of the ninth resistor is connected with the input end of the input monitoring module;
the second end of the ninth resistor is connected with the first end of the tenth resistor and the input end of the voltage detection device;
a second end of the tenth resistor is grounded.
The utility model discloses a series connection ninth resistance and tenth resistance, according to the partial pressure of ninth resistance and tenth resistance and the output voltage of the electric current determination first power input module of tenth resistance, again according to output voltage and control module's ith output is to ith control end transmission control signal, and control ith control switch is closed, provides the base of suitable ith steady voltage protection diode in order to control first triode, makes first triode switch on or turn-off. When the voltage is too large, the first triode is in an open state, so that the input voltage range is expanded, and an overvoltage protection effect is provided.
Further, the double-input-end anti-reverse-filling circuit for the adapter and the USB equipment further comprises a synergistic module;
the input end of the synergistic module is connected with the second output end of the reverse irrigation prevention module, and the output end of the synergistic module is connected with the input end of the main system.
Further, the synergy module includes: the synergy module includes: an eleventh resistor, a twelfth resistor, a fourth MOS tube and a fifth MOS tube;
a source electrode of the fourth MOS tube is connected with the input end of the synergy module and the first end of the eleventh resistor;
the second end of the eleventh resistor is connected with the first end of the twelfth resistor and the grid electrode of the fifth MOS transistor;
a second end of the twelfth resistor is grounded;
the grid electrode of the fourth MOS tube is connected with the drain electrode of the fifth MOS tube;
the drain electrode of the fourth MOS tube is connected with the output end of the synergistic module;
and the source electrode of the fifth MOS tube is grounded.
The utility model discloses when first power input module prevents flowing backward the module through preventing to supply power to main system, pull the grid of fifth MOS pipe to high potential through eleventh resistance, and then make the conduction of fifth MOS pipe to the fourth MOS pipe grid that will be connected with fifth MOS pipe drain electrode is pulled to the low potential, and then makes the fourth MOS pipe switch on and will prevent flowing backward the first diode short circuit in the module, has eliminated the pressure drop on the first diode, and then has promoted power supply efficiency.
Drawings
Fig. 1 is a connection relationship diagram of an embodiment of the dual input end anti-reverse-filling circuit based on the adapter and the USB device provided by the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Example one
The embodiment of the utility model provides a circuit is prevented irritating to dual input end based on adapter and USB equipment, include: the device comprises a first power input module, a second power input module and an anti-reverse-irrigation module;
the output end of the first power supply input module, the first input end and the second input end of the reverse irrigation prevention module; the output end of the second power supply input module is connected with the third input end of the reverse irrigation prevention module; the first output end and the second output end of the reverse irrigation prevention module are respectively connected with the input end of the main system;
the anti-reverse-irrigation module specifically comprises a first resistor R9, a second resistor R10, a first MOS (metal oxide semiconductor) tube Q2, a second MOS tube Q4, a first capacitor C1 and a first diode D3;
the source electrode of the first MOS tube Q2 is connected with the first input end of the reverse irrigation prevention module and the first end of the first capacitor C1;
the grid electrode of the first MOS tube Q2 is connected with the second end of the first capacitor C1 and the fourth input end of the reverse-filling prevention module;
the drain electrode of the first MOS tube Q2 is connected with the anode of the first diode D3 and the third output end of the reverse-filling prevention module;
the negative electrode of the first diode is connected with the first output end of the reverse filling prevention module;
the grid electrode of the second MOS transistor Q4 is connected with the first end of the first resistor R9 and the first end of the second resistor R10;
the second end of the first resistor R9 is connected with the second input end of the reverse irrigation prevention module;
the second end of the second resistor R10 is grounded;
the source electrode of the second MOS tube Q4 is connected with the second input end of the reverse irrigation prevention module;
and the drain electrode of the second MOS tube Q4 is connected with the second output end of the reverse irrigation prevention module.
In the embodiment of the present invention, when the output voltage of the first power input module reaches the turn-on voltage of the first MOS transistor Q2, the first MOS transistor Q2 is turned on and supplies power to the main system through the first diode D3, and the first diode D3 can prevent the back-filling phenomenon between the main system and the first power input module; when the first power input module and the second power input module supply power simultaneously and the output voltage of the first power input module is greater than the output voltage of the second voltage input module, the grid electrode of the second MOS tube is pulled to a high potential through the first resistor R9, so that the second MOS tube Q4 is in a turn-off state, and the reverse flow phenomenon between the first power input module and the second power input module is prevented.
Fig. 1 is a connection relationship diagram of an embodiment of a dual-input-end reverse-filling prevention circuit based on an adapter and a USB device. Anti-reverse-filling circuit of dual input end based on adapter and USB equipment, it prevents that reverse-filling module still includes: a third resistor R6, a fourth resistor R7, a fifth resistor R8, a second capacitor C2, a first voltage regulator tube D1, a second voltage regulator tube D2 and a third MOS tube Q3;
a first end of the third resistor R6 is connected with a grid electrode of the first MOS transistor Q2;
the second end of the third resistor R6 is connected with the anode of the first voltage-regulator tube D1 and the grid of the third MOS tube Q3;
the negative electrode of the first voltage-regulator tube D3 is connected with the first end of the fourth resistor R7;
a second end of the fourth resistor R7 is connected to the drain of the first MOS transistor Q2, the source of the third MOS transistor Q3, and the cathode of the second voltage regulator transistor D2;
the positive electrode of the second voltage regulator tube D2 is connected with the drain electrode of the third MOS tube, the first end of the fifth resistor R8, the first end of the second capacitor C2, the negative electrode of the first diode D3, and the third output end of the reverse-filling prevention module.
Further, the first power input module comprises an adapter;
and the output end of the adapter is connected with the output end of the first power input module.
Further, the second power input module comprises a USB device;
and the output end of the USB equipment is connected with the output end of the second power input module.
In the embodiment of the present invention, the source of the first MOS transistor Q2 is connected to the output terminal of the first output module, the drain of the first MOS transistor Q2 is connected to the source of the third MOS transistor Q3, and the source of the third MOS transistor Q3 is connected to the first diode D3, so as to ensure that the first MOS transistor Q2 and the third MOS transistor Q3 are turned on after the adapter voltage source is applied, the power source acts on the main system after passing through the first diode D3, and the first diode D3 prevents the voltage of the main system from flowing back to the first power input module; when the first power input module and the second power input module act simultaneously, the high voltage provided by the adapter power supply acts on the grid electrode of the second MOS tube Q4, and the source electrode of the second MOS tube Q4 is connected with the USB equipment, so that the Vgs of the second MOS tube does not meet the starting condition and is not conducted, and the high voltage provided by the first power input module is prevented from flowing back to the second power input module; in addition, the second voltage-regulator tube D2 is connected in parallel between the source electrode and the drain electrode of the third MOS tube Q3 so as to increase the conduction speed of the third MOS tube Q3; and the first voltage-regulator tube D1 is connected in parallel between the source and the gate of the third MOS tube Q3, for preventing the third MOS tube Q3 from being damaged due to the excessively high voltage between the source and the gate.
Further, the dual input end to adapter and USB equipment prevents flowing backward the circuit, still includes: the device comprises a control module, an input monitoring module and a voltage protection module;
wherein the control module has n output terminals; the voltage protection module is provided with n control ends;
the ith output end of the control module is connected with the ith control end of the voltage protection module; the input end of the voltage protection module is connected with the output end of the first power input module, the first output end of the voltage protection module is respectively connected with the first input end and the second input end of the reverse irrigation prevention module, and the second output end of the voltage protection module is connected with the fourth input end of the reverse irrigation prevention module; the input end of the input monitoring module is connected with the output end of the first power input module; wherein i is more than or equal to 1 and less than or equal to n.
Wherein, the voltage protection module specifically includes: the power supply comprises a sixth resistor R3, an ith control switch Ki, an ith voltage stabilizing protection diode ZDi and a first triode Q1;
a first end of the sixth resistor R3 is connected to a first output end of the voltage protection module and an emitter of the first triode Q1;
the second end of the sixth resistor R3 is connected with the first end of the ith control switch Ki and the base electrode of the first triode Q1;
the second end of the ith control switch Ki is connected with the negative electrode of the ith voltage stabilizing protection diode ZDi;
the third end of the ith control switch Ki is connected with the ith control end of the voltage protection module;
the positive electrode of the ith voltage-stabilizing protection diode ZDi is grounded;
and the collector electrode of the first triode Q1 is connected with the second output end of the voltage protection module and the circuit ground.
In the embodiment of the present invention, the input end of the input monitoring module is connected to the output end of the first power input module, so that the voltage range of the output voltage of the first power input module can be monitored in real time, after the output voltage of the first power input module is monitored, the output end of the control module is connected to the control end of the voltage protection module, the control signal is transmitted to the control end of the voltage protection module through the output end of the control module, the control switch corresponding to the voltage range is closed, and the corresponding i-th voltage regulator ZDi is connected, wherein the voltage between the emitter and the base of the first triode Q1 is equal to the output voltage of the first power book minus the voltage of the negative pole of the voltage regulator, vbe = Vin-Vzdi; therefore, when the input voltage of the adapter is too high, the Vbe is larger than the starting voltage to enable the first triode Q1 to be conducted, so that the voltage difference between the source electrode and the grid electrode of the first MOS tube Q2 is close to 0V, the first MOS tube Q2 is turned off, the Vgs of the third MOS tube Q3 cannot meet the starting voltage, and the third MOS tube Q3 is turned off, so that overvoltage protection is realized, and the range of the receivable input voltage is expanded.
Further, the voltage protection module includes: a seventh resistor R4 and an eighth resistor R5;
a first end of the seventh resistor R4 is connected to a second end of the sixth resistor R3 and a first end of the i-th control switch Ki;
the second end of the seventh resistor R4 is connected with the base electrode of the first triode Q1;
a first end of the eighth resistor R5 is connected to a collector of the first triode Q1;
the second end of the eighth resistor R5 is grounded.
Further, the input monitoring module comprises a ninth resistor R1 and a tenth resistor R2;
the first end of the ninth resistor R1 is connected with the input end of the input monitoring module;
the second end of the ninth resistor R1 is connected with the first end of the tenth resistor R2 and the input end of the voltage detection device;
a second end of the tenth resistor R2 is grounded.
The embodiment of the utility model provides an in, through establishing ties ninth resistance R1 and tenth resistance R2, confirm the output voltage of first power input module according to ninth resistance R1 and tenth resistance R2's partial pressure and tenth resistance R2's electric current, again according to output voltage and control module's ith output is to ith control end transmission control signal, and control ith control switch Ki is closed, provides suitable ith steady voltage protection diode ZDi in order to control first triode Q1's base, makes first triode Q2 switch on or turn-offs. When the voltage is over-high, the first triode Q1 is in an opening state, so that the first MOS tube is turned off, the input voltage range is expanded, and an overvoltage protection effect is provided.
Furthermore, the double-input-end anti-reverse-filling circuit for the adapter and the USB equipment further comprises a synergistic module;
the input end of the synergistic module is connected with the third output end of the reverse irrigation prevention module, and the output end of the synergistic module is connected with the input end of the main system.
Further, the synergy module includes: the synergy module includes: an eleventh resistor R11, a twelfth resistor R12, a fourth MOS transistor Q5 and a fifth MOS transistor Q6;
a source electrode of the fourth MOS transistor Q5 is connected to the input end of the synergistic module and the first end of the eleventh resistor R11;
a second end of the eleventh resistor R11 is connected to a first end of the twelfth resistor R12 and a gate of the fifth MOS transistor Q6;
a second end of the twelfth resistor R12 is grounded;
the grid electrode of the fourth MOS tube Q5 is connected with the drain electrode of the fifth MOS tube Q6;
the drain electrode of the fourth MOS tube Q5 is connected with the output end of the synergistic module;
and the source electrode of the fifth MOS tube Q6 is grounded.
The utility model discloses when first power input module prevents flowing backward the module and supply power to main system through preventing, pull the grid of fifth MOS pipe Q6 to the high potential through eleventh resistance R11, and then make fifth MOS pipe Q6 switch on, and pull the fourth MOS pipe Q5 grid of being connected with fifth MOS pipe Q6 drain electrode to the low potential, and then make fourth MOS pipe Q5 switch on and will prevent flowing backward the first diode D3 short circuit in the module, the last pressure drop of first diode D3 has been eliminated, and then power supply efficiency has been promoted.
The above-mentioned embodiments further describe the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the scope of the present invention. It should be understood that any modification, equivalent replacement, or improvement made by those skilled in the art without departing from the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A dual input terminal anti-reverse-filling circuit for an adapter and a USB device is characterized by comprising: the device comprises a first power input module, a second power input module and an anti-reverse-irrigation module;
the output end of the first power supply input module, the first input end and the second input end of the reverse irrigation prevention module; the output end of the second power supply input module is connected with the third input end of the reverse irrigation prevention module; the first output end and the second output end of the reverse irrigation prevention module are respectively connected with the input end of the main system;
the anti-reverse-irrigation module specifically comprises a first resistor, a second resistor, a first MOS (metal oxide semiconductor) tube, a second MOS tube, a first capacitor and a first diode;
the source electrode of the first MOS tube is connected with the first input end of the reverse-filling prevention module and the first end of the first capacitor;
the grid electrode of the first MOS tube is connected with the second end of the first capacitor and the fourth input end of the reverse-filling prevention module;
the drain electrode of the first MOS tube is connected with the anode of the first diode and the third output end of the reverse irrigation prevention module;
the negative electrode of the first diode is connected with the first output end of the reverse filling prevention module;
the grid electrode of the second MOS tube is connected with the first end of the first resistor and the first end of the second resistor;
the second end of the first resistor is connected with the second input end of the reverse irrigation prevention module;
the second end of the second resistor is grounded;
the source electrode of the second MOS tube is connected with the second input end of the reverse irrigation prevention module;
and the drain electrode of the second MOS tube is connected with the second output end of the reverse irrigation prevention module.
2. The dual-input-end anti-reverse-flow circuit for the adapter and the USB device as claimed in claim 1, wherein the first power input module comprises the adapter;
the output end of the adapter is connected with the output end of the first power input module.
3. The dual-input anti-reverse-flow circuit for the adapter and the USB device as claimed in claim 1, wherein the second power input module comprises the USB device;
and the output end of the USB equipment is connected with the output end of the second power input module.
4. The dual-input anti-reverse-flow circuit for an adapter and a USB device of claim 1, wherein the anti-reverse-flow module further comprises: the first MOS transistor comprises a first resistor, a second resistor, a fourth resistor, a fifth resistor, a second capacitor, a first voltage regulator tube, a second voltage regulator tube and a third MOS tube;
the first end of the third resistor is connected with the grid electrode of the first MOS tube;
the second end of the third resistor is connected with the anode of the first voltage-regulator tube and the grid of the third MOS tube;
the negative electrode of the first voltage-regulator tube is connected with the first end of the fourth resistor;
the second end of the fourth resistor is connected with the drain electrode of the first MOS tube, the source electrode of the third MOS tube and the cathode of the second voltage-regulator tube;
the positive electrode of the second voltage-stabilizing tube is connected with the drain electrode of the third MOS tube, the first end of the fifth resistor, the first end of the second capacitor, the negative electrode of the first diode and the third output end of the reverse-filling prevention module.
5. The dual-input anti-backflow circuit for an adapter and a USB device according to any one of claims 1-4, further comprising: the device comprises a control module, an input monitoring module and a voltage protection module;
wherein the control module has n output terminals; the voltage protection module is provided with n control ends;
the ith output end of the control module is connected with the ith control end of the voltage protection module; the input end of the voltage protection module is connected with the output end of the first power supply input module, the first output end of the voltage protection module is respectively connected with the first input end and the second input end of the reverse irrigation prevention module, and the second output end of the voltage protection module is connected with the fourth input end of the reverse irrigation prevention module; the input end of the input monitoring module is connected with the output end of the first power supply input module; wherein i is more than or equal to 1 and less than or equal to n,
wherein, the voltage protection module specifically includes: the power supply comprises a sixth resistor, an ith control switch, an ith voltage stabilizing protection diode and a first triode;
the first end of the sixth resistor is connected with the first output end of the voltage protection module and the emitting electrode of the first triode;
the second end of the sixth resistor is connected with the first end of the ith control switch and the base electrode of the first triode;
the second end of the ith control switch is connected with the negative electrode of the ith voltage-stabilizing protection diode;
the third end of the ith control switch is connected with the ith control end of the voltage protection module;
the positive electrode of the ith voltage-stabilizing protection diode is grounded;
and the collector of the first triode is connected with the second output end of the voltage protection module and the circuit ground.
6. The dual-input anti-backflow circuit for an adapter and a USB device of claim 5, wherein the voltage protection module comprises: a seventh resistor and an eighth resistor;
the first end of the seventh resistor is connected with the second end of the sixth resistor and the first end of the ith control switch;
the second end of the seventh resistor is connected with the base electrode of the first triode;
the first end of the eighth resistor is connected with the collector of the first triode;
and the second end of the eighth resistor is grounded.
7. The dual-input-end anti-backflow circuit for an adapter and a USB device as claimed in claim 5, wherein the input monitoring module comprises a ninth resistor and a tenth resistor;
the first end of the ninth resistor is connected with the input end of the input monitoring module;
the second end of the ninth resistor is connected with the first end of the tenth resistor and the input end of the voltage detection device;
a second end of the tenth resistor is grounded.
8. The dual-input-end anti-backflow circuit for the adapter and the USB device as claimed in any one of claims 1 to 4, further comprising a synergistic module;
the input end of the synergistic module is connected with the third output end of the reverse irrigation prevention module, and the output end of the synergistic module is connected with the input end of the main system.
9. The dual input-end anti-reverse-flow circuit for an adapter and a USB device of claim 8, wherein the synergistic module comprises: an eleventh resistor, a twelfth resistor, a fourth MOS transistor and a fifth MOS transistor;
a source electrode of the fourth MOS tube is connected with the input end of the synergy module and the first end of the eleventh resistor;
the second end of the eleventh resistor is connected with the first end of the twelfth resistor and the grid electrode of the fifth MOS transistor;
a second end of the twelfth resistor is grounded;
the grid electrode of the fourth MOS tube is connected with the drain electrode of the fifth MOS tube;
the drain electrode of the fourth MOS tube is connected with the output end of the synergistic module;
and the source electrode of the fifth MOS tube is grounded.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222000498.4U CN218102580U (en) | 2022-07-29 | 2022-07-29 | Double-input-end anti-reverse-filling circuit for adapter and USB equipment |
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| CN202222000498.4U CN218102580U (en) | 2022-07-29 | 2022-07-29 | Double-input-end anti-reverse-filling circuit for adapter and USB equipment |
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| CN218102580U true CN218102580U (en) | 2022-12-20 |
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| CN202222000498.4U Active CN218102580U (en) | 2022-07-29 | 2022-07-29 | Double-input-end anti-reverse-filling circuit for adapter and USB equipment |
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| CN (1) | CN218102580U (en) |
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2022
- 2022-07-29 CN CN202222000498.4U patent/CN218102580U/en active Active
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