CN210693552U - Dual-power switching circuit - Google Patents
Dual-power switching circuit Download PDFInfo
- Publication number
- CN210693552U CN210693552U CN201921890592.3U CN201921890592U CN210693552U CN 210693552 U CN210693552 U CN 210693552U CN 201921890592 U CN201921890592 U CN 201921890592U CN 210693552 U CN210693552 U CN 210693552U
- Authority
- CN
- China
- Prior art keywords
- vcc
- power supply
- diode
- mos tube
- main power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
Landscapes
- Stand-By Power Supply Arrangements (AREA)
Abstract
The utility model relates to a dual supply switching circuit. The purpose is to solve the problem that the dual-power equipment in the prior art can cause equipment restart and discontinuous work when the power supply is switched. The utility model comprises a main power source VCC, a standby battery VCC, a diode, a MOS tube and a resistor; the anode of the diode is connected with a main power supply VCC, and the cathode of the diode is connected with a load VCC; the drain electrode of the MOS tube is connected with a standby battery VCC, the source electrode of the MOS tube is connected with a load VCC, and the grid electrode of the MOS tube is grounded through a resistor; and the main power supply VCC is connected with the grid electrode of the MOS tube and is grounded through a resistor.
Description
Technical Field
The utility model relates to a power management field, concretely relates to dual supply switching circuit.
Background
In the application process of the dual-power supply system of the main power supply and the standby battery, if the two power supplies exist at the same time, the main power supply supplies power to the load, and the standby battery power supply does not supply power; if the main power supply is powered off, the standby battery power supply supplies power, and the two devices work continuously.
The current mainstream solution adopts a large relay or a contact switch to directly turn on or turn off, or two diodes are respectively connected in series on the positive lines of a main power supply and a standby power supply to supply power for double power supplies. Because the power supply of the main power supply and the standby battery power supply is switched by adopting the mode of directly switching on or off the large relay or the contact switch, the switching depends on the physical attraction of the relay, so that the power supply of the main power supply is switched to the power supply of the standby battery power supply by the power failure of the main power supply, the equipment can be restarted and the work is discontinuous; therefore, it is desirable to provide a power switching circuit with short switching time of the dual power sources and two power sources existing simultaneously to solve the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a dual power supply switching circuit in order to solve the dual power supply equipment that exists among the prior art and can lead to equipment restart, the discontinuous problem of work when the power switches. When the voltage of a main power supply is larger than that of a standby battery and the discharge voltage of the standby battery is close to the working voltage of a load, if the two power supplies exist simultaneously, the main power supply supplies power to the load, and the standby battery power supply does not supply power; if the main power supply is powered off, the standby battery power supply does not have voltage drop for supplying power, and the equipment works continuously.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
the utility model discloses a dual supply switching circuit, its special character lies in: the device comprises a main power supply VCC, a standby battery VCC, a first diode, an MOS (metal oxide semiconductor) tube and a resistor; the MOS tube is internally provided with a second diode arranged from the drain electrode to the source electrode in a forward direction;
the anode of the first diode is connected with a main power supply VCC, and the cathode of the first diode is connected with a load VCC;
the drain electrode of the MOS tube is connected with a standby battery VCC, and the source electrode of the MOS tube is connected with a load VCC;
the main power supply VCC is connected with the grid electrode of the MOS tube, and a node between the main power supply VCC and the MOS tube is grounded through a resistance signal GND.
Further, the first diode is a schottky diode.
Furthermore, the MOS tube is a PMOS tube.
Further, the resistance is 100K Ω.
Further, the voltage of the main power supply VCC is greater than the voltage of the backup battery VCC, and the difference value of the voltage is the voltage drop on the diode when the main power supply VCC supplies power, so that the normal work of the load is met.
The utility model has the advantages that: the utility model provides a dual power supply switching circuit not only logic is simple, but also can solve when the voltage of main power supply is greater than the stand-by battery and the stand-by battery discharge voltage is close to the load operating voltage, if two power supplies exist simultaneously, the main power supply supplies power for the load, the stand-by battery power supply does not supply power; if the main power supply is powered off, the standby battery power supply does not have voltage drop for supplying power, and the equipment works continuously.
Drawings
Fig. 1 is a schematic circuit diagram of a dual power switching circuit according to the present invention.
In the figure, 1-main power VCC, 2-first diode, 3-load VCC, 4-backup battery VCC, 5-MOS tube, 6-resistor, 7-ground signal GND.
Detailed Description
To make the objects, advantages and features of the present invention clearer, the following detailed description of a dual power switching circuit provided by the present invention is made with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following detailed description. It should be noted that: the drawings are in a very simplified form and are not to precise scale, and are provided solely for the purpose of facilitating and distinctly aiding in the description of the embodiments of the present invention; second, the structures shown in the drawings are often part of actual structures.
The utility model relates to a dual supply switching circuit, its theory of operation is:
example (b):
the utility model relates to a dual supply switching circuit's structure as follows:
as shown in fig. 1, the power supply device includes a main power supply VCC1, the main power supply VCC1 is connected to a P terminal of a diode 2, a G terminal of an MOS transistor 5, and one end of a resistor 6, an N terminal of the diode 2 is connected to a load VCC 3 and an S terminal of the MOS transistor 5, a D terminal of the MOS transistor 5 is connected to a backup battery VCC 4, and the other end of the resistor 6 is connected to a ground signal GND 7.
When the main power supply VCC1 and the backup battery VCC 4 exist at the same time, the main power supply VCC1 flows to the S end of the MOS tube 5 through the diode 2, when the voltage difference between the G end and the S end of the MOS tube 5 is larger than 0V, the S end and the D end of the MOS tube 5 are not conducted, the main power supply VCC1 supplies power to a load, the voltage of the load VCC 3 is the main power supply VCC1 minus the voltage drop value of the diode, and the normal work of the load is satisfied;
when the main power supply VCC1 is powered off, the standby battery VCC 4 flows to the S end of the MOS tube 5 through the diode inside the MOS tube 5, and when the voltage difference between the G pole and the S pole of the MOS tube 5 is smaller than 0V, the S pole and the D pole of the MOS tube 5 are conducted, the voltage drop is extremely small and can be ignored, and the voltage of the load VCC 3 is the voltage value of the standby battery VCC 4, so that the normal work of the load is met.
Claims (5)
1. A dual power switching circuit is characterized in that: the device comprises a main power supply VCC (1), a standby battery VCC (4), a first diode (2), an MOS (metal oxide semiconductor) tube (5) and a resistor (6); the MOS tube (5) is internally provided with a second diode which is arranged in a forward direction from a drain electrode to a source electrode;
the anode of the first diode (2) is connected with a main power supply VCC (1), and the cathode of the first diode (2) is connected with a load VCC;
the drain electrode of the MOS tube (5) is connected with a standby battery VCC (4), and the source electrode of the MOS tube (5) is connected with a load VCC;
and the main power supply VCC (1) is connected with the grid electrode of the MOS tube (5), and a node between the main power supply VCC and the MOS tube is grounded through a resistor (6) to form a signal GND (7).
2. The dual power supply switching circuit of claim 1, wherein: the first diode (2) is a Schottky diode.
3. The dual power supply switching circuit of claim 2, wherein: the MOS tube (5) is a PMOS tube.
4. The dual power supply switching circuit of claim 3, wherein: the resistor (6) is 100K omega.
5. The dual power supply switching circuit of claim 4, wherein: the voltage of main power VCC (1) is greater than the voltage of backup battery VCC (4), and its difference is the voltage drop on diode (2) when main power VCC supplies power to satisfy load normal work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921890592.3U CN210693552U (en) | 2019-11-05 | 2019-11-05 | Dual-power switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921890592.3U CN210693552U (en) | 2019-11-05 | 2019-11-05 | Dual-power switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210693552U true CN210693552U (en) | 2020-06-05 |
Family
ID=70895518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921890592.3U Active CN210693552U (en) | 2019-11-05 | 2019-11-05 | Dual-power switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210693552U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112271343A (en) * | 2020-09-17 | 2021-01-26 | 武汉光庭科技有限公司 | Power saving module and method for standby battery in TBOX |
-
2019
- 2019-11-05 CN CN201921890592.3U patent/CN210693552U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112271343A (en) * | 2020-09-17 | 2021-01-26 | 武汉光庭科技有限公司 | Power saving module and method for standby battery in TBOX |
| CN112271343B (en) * | 2020-09-17 | 2022-03-29 | 武汉光庭科技有限公司 | Power saving module and method for standby battery in TBOX |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100586021C (en) | Buffer circuit and integrated circuit | |
| CN214755708U (en) | Dual-input power supply control circuit with constant voltage switching | |
| CN103683470A (en) | Power supply device with power supply backup mechanism | |
| CN110875631A (en) | Dual-power-supply automatic switching circuit based on dual PMOS application | |
| US20150188531A1 (en) | Voltage regulator and resonant gate driver thereof | |
| CN210693552U (en) | Dual-power switching circuit | |
| CN210780130U (en) | Power-off control circuit | |
| CN209748259U (en) | Automatic switching circuit for standby battery | |
| CN111082640A (en) | Positive and negative excitation auxiliary power supply circuit and positive and negative excitation power supply circuit | |
| CN103376817A (en) | Power-gated electronic device | |
| CN115940110A (en) | Voltage selection circuit, voltage selection system and electronic device | |
| CN202094845U (en) | Device for managing power supply | |
| CN113872272A (en) | High-performance standby battery charging circuit | |
| CN211456676U (en) | Short-circuit protection circuit based on MOS auto-lock | |
| CN108418300B (en) | Main and standby battery power supply automatic switching output circuit | |
| CN207926260U (en) | A kind of multiple-way supply automatic switch-over circuit and supply unit | |
| CN201234161Y (en) | Seamless switching unit for DC electric power and standby electric power | |
| CN213484574U (en) | Main/standby power conversion circuit | |
| CN205829243U (en) | A kind of power circuit | |
| CN219107060U (en) | Protection circuit | |
| CN220066884U (en) | Dual-power input anti-backflow protection circuit and power supply device | |
| CN213342175U (en) | Power supply fast turn-off control circuit | |
| CN110198075B (en) | Redundant backup power supply, chip and electronic equipment | |
| CN211556968U (en) | Power-down holding circuit | |
| CN217824413U (en) | Uninterrupted power supply switching control circuit and device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A Dual Power Switching Circuit Effective date of registration: 20221104 Granted publication date: 20200605 Pledgee: Xi'an innovation financing Company limited by guarantee Pledgor: XI'AN QINLI COMPLETE SET OF ELECTRICAL APPLIANCES Co.,Ltd. Registration number: Y2022610000713 |