CN209748259U - Automatic switching circuit for standby battery - Google Patents
Automatic switching circuit for standby battery Download PDFInfo
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- CN209748259U CN209748259U CN201920304198.0U CN201920304198U CN209748259U CN 209748259 U CN209748259 U CN 209748259U CN 201920304198 U CN201920304198 U CN 201920304198U CN 209748259 U CN209748259 U CN 209748259U
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- diode
- power supply
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- battery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model relates to a spare battery automatic switching circuit, including first diode D1, second diode D2, third diode D3, spare battery, main power supply and external load; the anode of the first diode D1 is electrically connected with the anode of the main power supply; the anode of the third diode D3 is electrically connected to the anode of the backup battery; the cathode of the third diode D3 is electrically connected to the anode of the second diode D2; the cathode of the first diode D1 and the cathode of the second diode D2 are both electrically connected with the input end of an external load power supply; the negative pole of the standby battery, the negative pole of the main power supply and the output end of the external load are all grounded. The utility model discloses it is lower to set up the voltage that exports the load with the stand-by battery than the voltage that the load was exported to outside main power supply, and the automatic switch-over of main power supply and stand-by battery is realized to the height change through the same point potential, need not carry out programming control and switches, has the low-power consumption low-cost characteristics.
Description
Technical Field
The utility model relates to an electronic product application with mains operated, a stand-by battery automatic switch-over circuit.
Background
Among various electronic products, some products are powered by an external main power supply and a standby battery. When the external power supply is used, the output power supply is abnormal due to other factors, so that the electronic product cannot work normally. In order to prevent the product from stopping working due to external power supply failure, the power supply of the product needs to be immediately switched to the power supply of a standby battery, so that the electronic product continues to work. For the switching circuit of the external main power supply and the backup battery, two switches or two mosfets are usually adopted in the industry to realize the switching. When the external main power supply supplies power at ordinary times, the external power supply controls the switch to be closed, and the standby battery controls the switch to be disconnected; when the external power supply stops, the standby battery control switch is immediately closed, and the external power supply switch is disconnected. The method needs to perform program control on the switching of the two switches, and needs to accurately calculate the switching time of the two switches, otherwise, when the external main power supply stops supplying power and the switch of the standby battery is not turned on in time, the product loses the power supply.
Disclosure of Invention
In view of this, the utility model aims at providing a spare battery automatic switching circuit, can set up the voltage that spare battery exported the load to be lower than the voltage that outside main power supply exported the load, realize main power supply and spare battery's automatic switch-over through the height change of same point potential, need not carry out programming control switching, low-power consumption, low cost.
The utility model discloses a following scheme realizes: a spare battery automatic switching circuit comprises a first diode D1, a second diode D2, a third diode D3, a spare battery, a main power supply and an external load; the anode of the first diode D1 is electrically connected with the anode of the main power supply; the anode of the third diode D3 is electrically connected with the anode of the backup battery; the cathode of the third diode D3 is electrically connected with the anode of the second diode D2; the cathode of the first diode D1 and the cathode of the second diode D2 are both electrically connected with the external load power input end; and the negative electrode of the standby battery, the negative electrode of the main power supply and the output end of the external load are all grounded.
Further, the first diode D1, the second diode D2, and the third diode D3 are schottky diodes.
Compared with the prior art, the utility model discloses following beneficial effect has:
(1) The utility model discloses can be applied to the outside power supply of electronic product spare battery automatic switch-over when unusual, have low-power consumption, low-cost characteristics.
(2) The utility model discloses can switch immediately when electronic product outside power supply is unusual to the reserve battery power supply to need not carry out programming control and switch, power supply continuation when having ensured electronic product operation.
Drawings
Fig. 1 is a schematic circuit diagram according to an embodiment of the present invention.
Detailed Description
The present invention will be further explained with reference to the drawings and the embodiments.
as shown in fig. 1, the present embodiment provides an automatic standby battery switching circuit, which includes a first diode D1, a second diode D2, a third diode D3, a standby battery, a main power supply, and an external load; the anode of the first diode D1 is electrically connected with the anode of the main power supply; the anode of the third diode D3 is electrically connected with the anode of the backup battery; the cathode of the third diode D3 is electrically connected with the anode of the second diode D2; the cathode of the first diode D1 and the cathode of the second diode D2 are both electrically connected with the external load power input end; and the negative electrode of the standby battery, the negative electrode of the main power supply and the output end of the external load are all grounded.
In the present embodiment, schottky diodes are used for the first diode D1, the second diode D2, and the third diode D3.
Preferably, the diode D1 of the present embodiment is connected in series to the external main power supply branch, the anode of D1 is connected to the anode of the main power supply, and the cathode of D1 is connected to the external load power input VCC of the circuit; the diode D2 and the diode D3 are connected in series and then connected to the auxiliary battery branch, the anode of the diode D3 is connected to the anode of the auxiliary battery, the cathode of the diode D3 is connected to the anode of the diode D2, and the cathode of the diode D2 is connected to the external load power input VCC of the circuit.
The diodes D1, D2 and D3 in the circuit of the embodiment not only play roles in reverse charging protection and current flowing direction guarantee, but also play roles in voltage clamping. The output voltage of the standby battery in the circuit needs to be less than or equal to the output voltage of the external main power supply, the two power supplies are connected in the circuit in a flat time, and the forward conduction voltage drop of each Schottky diode is about 0.3V, so that the voltage of the point A of the main power supply branch is (V main power supply-0.3V), and the voltage of the point B of the standby battery branch is (V standby battery-0.3V-0.3V). The output voltage of the backup battery is less than or equal to the output voltage of the main power supply, so that the voltage at the point B is lower than the voltage at the point A by at least 0.3V, the high potential at the point A of the external main power supply supplies power to the load, and the backup battery does not output current.
When the external main power supply stops supplying power for some reason, the voltage of the point A is 0, the voltage of the point B is (V backup battery-0.3V-0.3V), and the point B of the backup battery continues to supply power to the load, so that the normal operation of the load is ensured.
When the external main power supply recovers power supply, the voltage of the point A rises to (V main power supply-0.3V), the voltage of the point B is (V standby battery-0.3V-0.3V), the voltage of the point B is lower than the voltage of the point A by at least 0.3V, the high potential of the point A of the external main power supply supplies power to the load, and the standby battery stops supplying power and outputting.
Preferably, the embodiment utilizes the unidirectional conductivity of the diode and the forward conduction voltage drop of the diode to clamp the voltage, the voltage output by the backup battery to the load is set to be lower than the voltage output by the external main power supply to the load, the automatic switching between the main power supply and the backup battery is realized through the high-low change of the potential at the same point, the programming control switching is not needed, and the method has the characteristics of low power consumption and low cost, and does not influence the normal operation of a product. The backup battery can be automatically switched when the external main power supply stops supplying power or recovers supplying power. The circuit realizes automatic switching without programming control switching, saves programming cost, and is simpler and lower in cost. It is worth mentioning that the utility model protects a hardware structure, as for the control method does not require protection. The above is only a preferred embodiment of the present invention. However, the present invention is not limited to the above embodiments, and any equivalent changes and modifications made according to the present invention do not exceed the scope of the present invention, and all belong to the protection scope of the present invention.
Claims (1)
1. The utility model provides a spare battery automatic switching circuit which characterized in that: the device comprises a first diode D1, a second diode D2, a third diode D3, a standby battery, a main power supply and an external load; the anode of the first diode D1 is electrically connected with the anode of the main power supply; the anode of the third diode D3 is electrically connected with the anode of the backup battery; the cathode of the third diode D3 is electrically connected with the anode of the second diode D2; the cathode of the first diode D1 and the cathode of the second diode D2 are both electrically connected with the external load power input end; the negative electrode of the standby battery, the negative electrode of the main power supply and the output end of the external load are all grounded;
Wherein, the first diode D1, the second diode D2 and the third diode D3 are schottky diodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920304198.0U CN209748259U (en) | 2019-03-11 | 2019-03-11 | Automatic switching circuit for standby battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920304198.0U CN209748259U (en) | 2019-03-11 | 2019-03-11 | Automatic switching circuit for standby battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209748259U true CN209748259U (en) | 2019-12-06 |
Family
ID=68716274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920304198.0U Active CN209748259U (en) | 2019-03-11 | 2019-03-11 | Automatic switching circuit for standby battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209748259U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112133054A (en) * | 2020-09-08 | 2020-12-25 | 北京法之运科技有限公司 | Man-gun separation alarm device |
| CN113746311A (en) * | 2021-07-19 | 2021-12-03 | 许继集团有限公司 | Flexible and straight submodule bypass switch driving system |
-
2019
- 2019-03-11 CN CN201920304198.0U patent/CN209748259U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112133054A (en) * | 2020-09-08 | 2020-12-25 | 北京法之运科技有限公司 | Man-gun separation alarm device |
| CN113746311A (en) * | 2021-07-19 | 2021-12-03 | 许继集团有限公司 | Flexible and straight submodule bypass switch driving system |
| CN113746311B (en) * | 2021-07-19 | 2023-11-17 | 许继集团有限公司 | Flexible straight submodule bypass switch driving system |
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