CN216016526U - Double-circuit power supply switching circuit - Google Patents
Double-circuit power supply switching circuit Download PDFInfo
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- CN216016526U CN216016526U CN202122229266.1U CN202122229266U CN216016526U CN 216016526 U CN216016526 U CN 216016526U CN 202122229266 U CN202122229266 U CN 202122229266U CN 216016526 U CN216016526 U CN 216016526U
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Abstract
The utility model discloses a double-circuit power supply switching circuit, include: the wireless power supply comprises a first USB power supply input end, a second wireless power supply input end, an MOS (metal oxide semiconductor) tube, a first diode, a first resistor, a first capacitor and a power supply output end; the source electrode of the MOS tube is connected with the power supply output end, the drain electrode of the MOS tube is connected with the first USB power supply input end, and the grid electrode of the MOS tube is connected with the second wireless power supply input end; the anode of the first diode is connected with the input end of the second wireless power supply, and the cathode of the first diode is connected with the output end of the power supply; the first end of the first resistor is connected with the input end of the second wireless power supply, and the second end of the first resistor is grounded; the first capacitor is connected in parallel with the first resistor. The utility model discloses can reduce the pressure drop in the circuit under the condition of low breakover voltage for the voltage stabilization output, the isolation of each other of two way powers has simultaneously realized preventing that the circuit from flowing backward and the effect that wireless power supply and USB wired power supply freely switch over.
Description
Technical Field
The utility model belongs to the switching circuit field, in particular to double-circuit power supply switching circuit.
Background
With the development of wireless charging technology, at present, many electronic devices such as earphones, mobile phones and bracelets can both realize the function of wireless charging, but most of electronic devices still keep wired and wireless charging simultaneously.
When the wireless power supply and the wired power supply power simultaneously, the power supply of each path can influence the power supply of the other path, and the USB charging or wireless charging part is easy to damage.
At present, in the prior art, an external complex circuit control module is needed to control the voltage of the grid of the MOS tube in the double-circuit power supply switching circuit, and when the reverse filling function is realized, the output of the circuit voltage is reduced due to the increased diode voltage drop, the conduction voltage is lost, and the effect of low conduction voltage cannot be realized.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a double-circuit power supply switching circuit is provided and solved and reduced the problem of conduction voltage's loss at the low in-process that switches on to avoided the electric current to irritate to arbitrary one end power input end.
In order to solve the technical problem, the utility model provides a double-circuit power supply switching circuit, include: the wireless power supply comprises a first USB power supply input end, a second wireless power supply input end, an MOS (metal oxide semiconductor) tube, a first diode, a first resistor, a first capacitor and a power supply output end;
the source electrode of the MOS tube is connected with the power supply output end, the drain electrode of the MOS tube is connected with the first USB power supply input end, and the grid electrode of the MOS tube is connected with the second wireless power supply input end;
the anode of the first diode is connected with the input end of the second wireless power supply, and the cathode of the first diode is connected with the output end of the power supply;
the first end of the first resistor is connected with the input end of a second wireless power supply, and the second end of the first resistor is grounded;
the first capacitor is connected in parallel with the first resistor.
Preferably, the MOS transistor is a PMOS field effect transistor.
Preferably, a body diode is parasitic in the PMOS field effect transistor.
Preferably, the first diode is a schottky diode.
Preferably, the first USB power input end is connected to an external USB wired power source, and the second wireless power input end is connected to an external wireless power source.
Preferably, the external USB wired power voltage is 5V, and the external wireless power voltage is 5.4V.
The embodiment of the application has the following beneficial effects:
the utility model provides a pair of double-circuit power supply switching circuit, compared with the prior art, the utility model discloses can utilize the wired power of USB as the input when only USB power input, utilize wireless power supply as the input when only wireless power input, input simultaneously at USB power input and wireless power supply, wireless power input has higher priority, make the voltage of power output wireless power supply input, the intraductal body diode of MOS can prevent the electric current from backward pouring into the circuit well simultaneously, and reduce the diode in the circuit as far as, reduced the loss to turn-on voltage, realize low turn-on voltage's effect.
Drawings
Fig. 1 is a schematic diagram of a dual power supply switching circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the following description will be made in detail with reference to the accompanying drawings of the present invention. It should be understood that the embodiments described herein are only some embodiments, not all embodiments, and are not intended to limit the present invention. Based on the embodiments in the present invention, other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
Please refer to fig. 1, which is a dual power switching circuit according to an embodiment of the present invention, including: the wireless power supply comprises a first USB power supply input end 01, a second wireless power supply input end 02, a MOS tube Q1, a first diode D1, a first resistor R1, a first capacitor C1 and a power supply output end 03.
In the preferred embodiment, the source of the MOS transistor Q1 is connected to the power output terminal 03, the drain of the MOS transistor Q1 is connected to the first USB power input terminal 01, and the gate of the MOS transistor Q1 is connected to the second wireless power input terminal 02.
In the preferred embodiment, the MOS transistor Q1 is a PMOS fet with a body diode parasitic inside the PMOS fet.
In the preferred embodiment, the anode of the first diode D1 is connected to the second wireless power input 02, and the cathode of the first diode D1 is connected to the power output 03; the first diode D1 is a schottky diode.
In the preferred embodiment, the first end of the first resistor R1 is connected to the second wireless power input 02, and the second end of the first resistor R1 is connected to ground.
In the preferred embodiment, the first capacitor C1 is connected in parallel with the first resistor R1; the first capacitor C1 is used for protecting the circuit.
In the preferred embodiment, the first USB power input terminal 01 is connected to an external USB wired power supply, and the voltage of the external USB wired power supply is 5V; the second wireless power input 02 is connected to an external wireless power supply, the voltage of which is 5.4V.
In the preferred embodiment, when only the external USB wired power is input and the external wireless power is not input, the gate voltage of the MOS transistor Q1 is pulled down to the ground level by the first resistor R1, the MOS transistor Q1 is fully turned on, the external USB wired power can be transmitted to the power output terminal 03 through the first USB power input terminal 01 with almost no voltage loss, and the voltage of the power output terminal 03 is 5V at this time; however, the first diode D1 is connected to the input terminal 02 of the second wireless power supply, so that the reverse irrigation to the input terminal 02 of the second wireless power supply is prevented.
In the preferred embodiment, when only an external wireless power is input and no external USB wired power is input, the gate voltage of the MOS transistor Q1 is boosted by the external wireless power voltage at the second wireless power input terminal 02, the MOS transistor Q1 is completely turned off, the external wireless power voltage is transmitted to the power output terminal 03 through the second wireless power input terminal 02 and the first diode D1, and since the voltage drop of the first diode D1 is 0.4V, the voltage at the power output terminal 03 is 5V obtained by subtracting the voltage drop of the first diode D1 from the external wireless power voltage; however, since the input terminal of the first USB power supply input 01 is connected to the MOS transistor Q1, the MOS transistor Q1 is in an off state at this time, and a body diode is parasitic on the MOS transistor Q1, which prevents reverse flow to the first USB power supply input terminal 01.
In the preferred embodiment, when the external wireless power input and the external USB wired power are simultaneously input, the gate voltage of the MOS transistor Q1 is raised by the external wireless power voltage at the second wireless power input 02, the MOS transistor Q1 is turned off, the external USB power voltage is transmitted to the power output end through the first USB power input 01 and the body diode of the MOS transistor Q1, the external wireless power voltage is transmitted to the power output end 03 through the second wireless power input 02 and the first diode D1, but since the body diode of the MOS transistor Q1 and the voltage drop of the first diode D1 are almost the same, and the external wireless power voltage is greater than the external USB power voltage, the voltage of the power output end 03 is 5V after the voltage drop of the first diode D1 is subtracted from the external wireless power voltage; however, since the MOS transistor Q1 is in the off state and the body diode is parasitic in the MOS transistor Q1, the reverse-flow to the first USB power input terminal 01 is prevented.
In the preferred embodiment, when the external wireless power input and the external USB wired power are simultaneously input, but the voltage value of a certain path is reduced due to some uncertain reasons, the voltage output by the power output terminal 03 depends on the path of power with the larger voltage value in this case, so as to ensure that the power output terminal 03 can stably output the voltage.
Implement the embodiment of the utility model provides a, have following effect:
the embodiment of the utility model provides a through providing a double-circuit power supply switching circuit, can stabilize output voltage under low breakover voltage, and when single-circuit power supply or double-circuit power supply simultaneously, prevent that the USB power or the wireless power supply that lead to are irritated by the electric current of the lower one end of no voltage input or voltage from damaging, too much diode makes the circuit pressure drop improve and the output voltage that leads to not enough under the condition that also can avoid low breakover voltage simultaneously, the low differential pressure loss of circuit and the function of the free switching circuit of two way powers have been realized.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (6)
1. A dual power switching circuit, comprising: the wireless power supply comprises a first USB power supply input end, a second wireless power supply input end, an MOS (metal oxide semiconductor) tube, a first diode, a first resistor, a first capacitor and a power supply output end;
the source electrode of the MOS tube is connected with the power supply output end, the drain electrode of the MOS tube is connected with the first USB power supply input end, and the grid electrode of the MOS tube is connected with the second wireless power supply input end;
the anode of the first diode is connected with the input end of the second wireless power supply, and the cathode of the first diode is connected with the output end of the power supply;
the first end of the first resistor is connected with the input end of a second wireless power supply, and the second end of the first resistor is grounded;
the first capacitor is connected with the first resistor in parallel.
2. The dual power switching circuit of claim 1 wherein said MOS transistors are PMOS fets.
3. The dual power switching circuit of claim 2 wherein a body diode is parasitic inside said PMOS fet.
4. The dual power switching circuit of claim 1 wherein said first diode is a schottky diode.
5. The dual power supply switching circuit of claim 1 wherein the first USB power input is connected to an external USB wired power supply and the second wireless power input is connected to an external wireless power supply.
6. The dual power supply switching circuit of claim 5 wherein said external USB wired supply voltage is 5V and said external wireless supply voltage is 5.4V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122229266.1U CN216016526U (en) | 2021-09-15 | 2021-09-15 | Double-circuit power supply switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122229266.1U CN216016526U (en) | 2021-09-15 | 2021-09-15 | Double-circuit power supply switching circuit |
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| Publication Number | Publication Date |
|---|---|
| CN216016526U true CN216016526U (en) | 2022-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122229266.1U Active CN216016526U (en) | 2021-09-15 | 2021-09-15 | Double-circuit power supply switching circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116800068A (en) * | 2023-08-18 | 2023-09-22 | 北京紫光芯能科技有限公司 | Circuit unit for power supply switching, topology circuit and power supply system |
-
2021
- 2021-09-15 CN CN202122229266.1U patent/CN216016526U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116800068A (en) * | 2023-08-18 | 2023-09-22 | 北京紫光芯能科技有限公司 | Circuit unit for power supply switching, topology circuit and power supply system |
| CN116800068B (en) * | 2023-08-18 | 2024-01-02 | 北京紫光芯能科技有限公司 | Circuit unit for power supply switching, topology circuit and power supply system |
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