CN204424951U - Power supply automatic switchover circuit - Google Patents
Power supply automatic switchover circuit Download PDFInfo
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- CN204424951U CN204424951U CN201520047384.2U CN201520047384U CN204424951U CN 204424951 U CN204424951 U CN 204424951U CN 201520047384 U CN201520047384 U CN 201520047384U CN 204424951 U CN204424951 U CN 204424951U
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- power supply
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Abstract
The utility model discloses a kind of power supply automatic switchover circuit, this circuit comprises diode D1, resistance R1 and metal-oxide-semiconductor TR1, the positive pole of interface J1 is powered to POWER by diode D1, the positive pole of interface J1 is by resistance R1 ground connection, the positive pole of interface J1 is direct or be connected by the grid of inverter with metal-oxide-semiconductor TR1, and interface J2 is powered to POWER with drain electrode by the source electrode of metal-oxide-semiconductor TR1.The utility model adopts seldom simple device, the first power supply can be automatically disconnected when accessing the second power-supply device, need not be artificial remove selector switch, reach the object automatically identifying and isolate two-way power supply, more convenient, and there will not be and changed power supply and forget the situation pushing pass aside, more reliably, convenient and automation.The components and parts that the utility model uses are simple, with low cost.
Description
Technical field
The utility model discloses a kind of power circuit, particularly a kind of power supply automatic switchover circuit, can be applied in the circuit comprising multiple supply power mode, automatically carry out the switching of different electrical power.
Background technology
In present electric equipment, a lot of circuit board all can be equipped with multiple supply power mode, such as both can power with adapter, also can be powered by power module.Some circuit do not keep apart two kinds of different power supplys, may occur the mutual interference between different electrical power like this; The mode of some circuit design switches isolates different power supplys, cumbersome like this, all needs the state confirming switch at every turn, judges whether power supply normally connects; The circuit also had adopts the differentiation different electrical power of power management chip, and circuit more complicated, cost is relatively high.
Summary of the invention
The shortcoming complicated for power isolation circuit in multiple feed mode equipment in the above-mentioned prior art mentioned, cost is high, the utility model provides a kind of new power supply automatic switchover circuit, it is by the conduction property of metal-oxide-semiconductor, coordinates resistance, electric capacity and diode etc. to realize automatically identifying and isolating the object of two-way power supply.
The technical scheme that the utility model solves the employing of its technical problem is: a kind of power supply automatic switchover circuit, circuit comprises diode D1, resistance R1 and metal-oxide-semiconductor TR1, the positive pole of interface J1 is powered to POWER by diode D1, the positive pole of interface J1 is by resistance R1 ground connection, the positive pole of interface J1 is direct or be connected by the grid of inverter with metal-oxide-semiconductor TR1, and interface J2 is powered to POWER with drain electrode by the source electrode of metal-oxide-semiconductor TR1.
The technical scheme that the utility model solves the employing of its technical problem further comprises:
Described circuit also comprises electric capacity C1, and electric capacity C1 and resistance R1 is connected in parallel.
When described metal-oxide-semiconductor TR1 adopts low level conducting metal-oxide-semiconductor, the positive pole of interface J1 is directly connected with the grid of metal-oxide-semiconductor TR1; When described metal-oxide-semiconductor TR1 adopts high level conducting metal-oxide-semiconductor, the positive pole of interface J1 is connected by the grid of inverter with metal-oxide-semiconductor TR1.
Described diode D1 adopts Schottky diode.
The beneficial effects of the utility model are: the utility model adopts seldom simple device, the first power supply can be automatically disconnected when accessing the second power-supply device, need not be artificial remove selector switch, reach the object automatically identifying and isolate two-way power supply, more convenient, and there will not be and changed power supply and forget the situation pushing pass aside, more reliably, convenient and automation.The components and parts that the utility model uses are simple, with low cost.
Below in conjunction with the drawings and specific embodiments, the utility model is described further.
Accompanying drawing explanation
Fig. 1 is the utility model circuit theory diagrams.
Embodiment
The present embodiment is the utility model preferred implementation, and other its principles all are identical with the present embodiment or approximate with basic structure, all within the utility model protection range.
Please refer to accompanying drawing 1, the utility model mainly comprises diode D1, resistance R1, electric capacity C1 and metal-oxide-semiconductor TR1, the positive pole of interface J1 is powered to POWER by diode D1, and the positive pole of interface J1 is by resistance R1 ground connection, and electric capacity C1 and resistance R1 is connected in parallel, the effect of electric capacity C1 is filtering, make switching signal more stable, the positive pole of interface J1 is connected with the grid of metal-oxide-semiconductor TR1, in the present embodiment, to be defined as node 1, interface J2 is powered to POWER with drain electrode by the source electrode of metal-oxide-semiconductor TR1 herein.
In the present embodiment, interface J1 is first via power input interface, and interface J2 is the second road power input interface, and POWER is out-put supply.Diode D1 adopts model to be the Schottky diode of B360A-13-F, during concrete enforcement, also can be replaced by other diodes, the effect of diode D1 is the voltage preventing the voltage reversal of POWER from affecting node 1, causes metal-oxide-semiconductor TR1 to make circuit malfunction from turning off.In the present embodiment, the resistance of resistance R1 is 10K, and metal-oxide-semiconductor TR1 adopts low level conducting metal-oxide-semiconductor, when specifically implementing, also can have additional inverter on its gate, and adopt high level conducting metal-oxide-semiconductor.
In use, when only access interface J2 power supply, node 1 can be pulled down to 0V by resistance R1, metal-oxide-semiconductor TR1 conducting to the utility model, connects upper POWER power by the power supply of interface J2; When having accessed interface J1, the voltage of node 1 can have been drawn high by interface J1, and metal-oxide-semiconductor TR1 disconnects, and circuit does not affect by interface J2 power supply, and interface J1 powers by POWER in diode D1 connection simultaneously.
The diode D1 that the utility model adopts, the device property of metal-oxide-semiconductor TR1 all depend on be suitable for power supply POWER.The utility model POWER scope applicatory, more at 3.3V ~ 30V, according to different POWER voltage, needs to select corresponding withstand voltage diode D1 and metal-oxide-semiconductor TR1.
The utility model adopts seldom simple device, the first power supply can be automatically disconnected when accessing the second power-supply device, need not be artificial remove selector switch, reach the object automatically identifying and isolate two-way power supply, more convenient, and there will not be and changed power supply and forget the situation pushing pass aside, more reliably, convenient and automation.The components and parts that the utility model uses are simple, with low cost.
Claims (4)
1. a power supply automatic switchover circuit, it is characterized in that: described circuit comprises diode D1, resistance R1 and metal-oxide-semiconductor TR1, the positive pole of interface J1 is powered to POWER by diode D1, the positive pole of interface J1 is by resistance R1 ground connection, the positive pole of interface J1 is direct or be connected by the grid of inverter with metal-oxide-semiconductor TR1, and interface J2 is powered to POWER with drain electrode by the source electrode of metal-oxide-semiconductor TR1.
2. power supply automatic switchover circuit according to claim 1, is characterized in that: described circuit also comprises electric capacity C1, and electric capacity C1 and resistance R1 is connected in parallel.
3. power supply automatic switchover circuit according to claim 1 and 2, is characterized in that: when described metal-oxide-semiconductor TR1 adopts low level conducting metal-oxide-semiconductor, the positive pole of interface J1 is directly connected with the grid of metal-oxide-semiconductor TR1; When described metal-oxide-semiconductor TR1 adopts high level conducting metal-oxide-semiconductor, the positive pole of interface J1 is connected by the grid of inverter with metal-oxide-semiconductor TR1.
4. power supply automatic switchover circuit according to claim 1 and 2, is characterized in that: described diode D1 adopts Schottky diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520047384.2U CN204424951U (en) | 2015-01-23 | 2015-01-23 | Power supply automatic switchover circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520047384.2U CN204424951U (en) | 2015-01-23 | 2015-01-23 | Power supply automatic switchover circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204424951U true CN204424951U (en) | 2015-06-24 |
Family
ID=53475280
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520047384.2U Expired - Fee Related CN204424951U (en) | 2015-01-23 | 2015-01-23 | Power supply automatic switchover circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204424951U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113098092A (en) * | 2021-04-02 | 2021-07-09 | 上海创米科技有限公司 | Power supply method and charging method of super capacitor |
-
2015
- 2015-01-23 CN CN201520047384.2U patent/CN204424951U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113098092A (en) * | 2021-04-02 | 2021-07-09 | 上海创米科技有限公司 | Power supply method and charging method of super capacitor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150624 Termination date: 20220123 |