CN210985739U - Dual-power supply circuit - Google Patents
Dual-power supply circuit Download PDFInfo
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- CN210985739U CN210985739U CN202020079763.0U CN202020079763U CN210985739U CN 210985739 U CN210985739 U CN 210985739U CN 202020079763 U CN202020079763 U CN 202020079763U CN 210985739 U CN210985739 U CN 210985739U
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- power supply
- resistor
- controllable switch
- diode
- dual
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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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Abstract
The utility model relates to a dual power supply circuit, which comprises a main power supply and a standby power supply, wherein the circuit comprises a controllable switch and a diode; the standby power supply is connected with the first end of the controllable switch; the main power supply is simultaneously connected with the anode of the diode and the second end of the controllable switch; the cathode of the diode is simultaneously connected with the standby power supply, the control end of the controllable switch and the ground. The dual-power supply circuit adopting the structure can automatically switch to the standby power supply for power supply after the main power supply is powered off, and when the main power supply works normally, the main power supply directly supplies power, so that the circuit is high in efficiency, good in performance and good in applicability.
Description
Technical Field
The utility model relates to a circuit field especially relates to supply circuit technical field, specifically indicates a dual power supply circuit.
Background
The dual-power supply means that when the main power supply is disconnected, the power supply is automatically switched to the standby power supply to enable the connected equipment to still run normally. The common dual-power supply technology can be generally applied to environments such as elevators, fire fighting, monitoring and emergency lighting. The common switching method before the dual power supply utilizes a plurality of relays to realize switching, and the cost is high due to the fact that the price of the relays is high. For low power products, there are simple methods of connecting a diode to each of the main and backup power supplies, but this results in the backup power supply being available and always on standby. The invention can detect whether the main power supply is powered off or not, and can automatically switch to the standby power supply to supply power after the main power supply is powered off.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming at least one above-mentioned prior art's shortcoming, providing a simple structure, saving about low, the good dual power supply circuit of suitability.
In order to achieve the above object or other objects, the dual power supply circuit of the present invention is as follows:
the dual-power supply circuit comprises a main power supply and a standby power supply, and is mainly characterized in that the circuit comprises a controllable switch and a diode;
the standby power supply is connected with the first end of the controllable switch;
the main power supply is simultaneously connected with the anode of the diode and the second end of the controllable switch;
the cathode of the diode is simultaneously connected with the standby power supply, the control end of the controllable switch and the ground.
Preferably, the controllable switch is composed of a PMOS transistor, a gate of the PMOS transistor constitutes a control end of the controllable switch, a source of the PMOS transistor constitutes a first end of the controllable switch, and a drain of the PMOS transistor constitutes a second end of the controllable switch.
Preferably, the cathode of the diode is connected with the standby power supply through a first resistor; the cathode of the diode is grounded through a second resistor; the cathode of the diode is connected with the control end of the controllable switch through a third resistor; the main power supply is connected with the anode of the diode through a fourth resistor.
Preferably, the first resistor is formed by a resistor with a resistance value of 2K to 4.7K, the second resistor is formed by a resistor with a resistance value of 10K to 40K, the third resistor is formed by a resistor with a resistance value of 10 Ω, and the fourth resistor is formed by a resistor with a resistance value of 1K to 2K.
Preferably, the second end of the controllable switch is used as the output end of the dual power supply circuit and is connected with an external load.
Adopt the utility model discloses a dual power supply circuit through the controllable switch who sets up in the circuit, can fall the power back at the main power supply, and automatic switch is the stand-by power supply, and when the main power supply normally worked, directly by the main power supply, this circuit efficiency is high, the performance is good, and the suitability is good.
Drawings
Fig. 1 is a circuit diagram of a dual power supply 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 clearer, the present invention is described in detail with reference to specific embodiments.
As shown IN fig. 1, the dual power supply circuit of the present invention includes a main power supply PWR, a standby power supply Battery _ IN, a controllable switch and a diode D12;
the standby power supply Battery _ IN is connected with the first end of the controllable switch;
the main power PWR is connected to both the anode of the diode D12 and the second terminal of the controllable switch;
the cathode of the diode D12 is connected to the standby power supply Battery _ IN, the control terminal of the controllable switch, and the ground GND _ IN at the same time.
In this embodiment, the controllable switch is composed of a PMOS transistor Q5, a gate of the PMOS transistor Q5 constitutes a control terminal of the controllable switch, a source of the PMOS transistor Q5 constitutes a first terminal of the controllable switch, and a drain of the PMOS transistor Q5 constitutes a second terminal of the controllable switch.
In a specific implementation, the diode D12 may be formed by a schottky diode.
IN this embodiment, the cathode of the diode D12 is connected to the standby power supply Battery _ IN through a first resistor R1; the cathode of the diode D12 is grounded GND _ IN through a second resistor R2; the cathode of the diode D12 is connected with the control end of the controllable switch through a third resistor R3; the main power PWR is connected to the anode of the diode D12 through a fourth resistor R4.
In practical implementation, the first resistor R1 is composed of resistors with resistance values of 2K to 4.7K, the second resistor R2 is composed of resistors with resistance values of 10K to 40K, the third resistor R3 is composed of resistors with resistance values of 10 Ω, and the fourth resistor R4 is composed of resistors with resistance values of 1K to 2K.
For example, in one embodiment, the first resistor R1 may be formed by a resistor of 2K, the second resistor R2 may be formed by a resistor of 20K, and the third resistor R3 may be formed by a resistor of 10 Ω.
IN this embodiment, the second terminal of the controllable switch is used as the output terminal PWR _ IN of the dual power supply circuit and is connected to an external load.
The dual power supply circuit in this embodiment is composed of a PMOS transistor Q5 and a diode, and a check line is led out to the gate of the PMOS transistor Q5 through the diode D12 while the main power PWR is normally supplying power. If the power failure of the main power supply PWR is detected, the PMOS is conducted, the standby power supply Battery _ IN supplies power, and the automatic switching to the standby power supply Battery _ IN supplies power is realized.
The dual power supply circuit in this embodiment is further described below with reference to fig. 1:
the first resistor R1 is provided to prevent the standby power supply Battery _ IN from being damaged due to the fact that the voltage of the main power supply PWR is greater than the voltage of the standby power supply Battery _ IN; the second resistor R2 is set for making the gate of the MOS tube default to low level; the third resistor R3 is provided to prevent the main power PWR from overshooting, and the fourth resistor R4 functions to limit the current of the main power PWR, and prevent a large current from reaching the standby power Battery _ IN after passing through the diode D12 and the first resistor R1. The diode D12 prevents the current of the standby power supply Battery _ IN from flowing back to the main power supply PWR through the first resistor R1 when the main power supply PWR is dead.
The controllable switch plays a role IN detection IN the circuit, the control end of the controllable switch is connected with the main power supply PWR, and when the power supply of the main power supply PWR is abnormal, the standby power supply Battery _ IN triggers the controllable switch to be switched on, so that the automatic switching function is realized.
1. When the main power supply PWR supplies power normally, the grid electrode of the PMOS tube is at a high level, the PMOS tube is not conducted, and the main power supply PWR supplies power normally at the moment.
2. When the power failure of the main power supply PWR occurs, the grid electrode of the PMOS tube is at a low level, the PMOS tube is conducted, and the power supply is switched to the standby power supply.
3. When the main power PWR recovers to supply power, the grid electrode of the PMOS tube is at a high level, the PMOS tube is not conducted, and the main power PWR recovers to supply power normally.
The standby power supply Battery _ IN can be composed of a Battery or a power supply device such as a charger, the dual-power supply circuit can supply power to the PON product (namely, the external load is the PON product), the PON product is used as a tool for people to surf the internet IN daily life, and when the PON product is connected with the dual-power supply circuit IN the embodiment, when power failure occurs, the standby power supply Battery _ IN can be automatically switched to supply power, for example, the Battery or the charger supplies power to the PON product. Therefore, people can not have inconvenience in surfing the Internet due to power failure. The dual power supply circuit in this embodiment can also supply power to other devices, making the circuit more stable. The dual-power supply circuit automatically identifies whether the main power supply is powered down or not, and can automatically switch to the standby power supply to supply power after the main power supply is powered down. Compared with the method of utilizing the relay in the prior art, the method has low cost and high efficiency compared with the method of utilizing the diode in the prior art. In this embodiment, since the MOS transistor is used, the voltage is almost constant when the battery power (backup power) passes through the source to the drain, and thus the problem of significant voltage drop due to the voltage passing through the diode in the prior art does not occur.
The output end of the dual-power supply circuit has no voltage drop difference. In our daily life, the most used standby power supply is the charger, the output voltage of the charger is 5V, the input voltage range of most DC-DC power supply chips on the market is 4.5-18V, and if we enable the power supply of the charger to pass through a diode and then power on our PON, the PON is likely to be out of service. Since the diode has a voltage drop of around 0.7V. 5-0.7 ═ 4.3V is less than the minimum input range value of DC-DC. The double-power-supply circuit in the technical scheme can not face the problem, and the effective switching between the main power supply and the standby power supply is ensured.
Adopt the utility model discloses a dual power supply circuit through the controllable switch who sets up in the circuit, can fall the power back at the main power supply, and automatic switch is the stand-by power supply, and when the main power supply normally worked, directly by the main power supply, this circuit efficiency is high, the performance is good, and the suitability is good.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (5)
1. A dual power supply circuit comprises a main power supply and a standby power supply, and is characterized in that the circuit comprises a controllable switch and a diode;
the standby power supply is connected with the first end of the controllable switch;
the main power supply is simultaneously connected with the anode of the diode and the second end of the controllable switch;
the cathode of the diode is simultaneously connected with the standby power supply, the control end of the controllable switch and the ground.
2. The dual power supply circuit of claim 1, wherein the controllable switch is formed by a PMOS transistor, a gate of the PMOS transistor forming a control terminal of the controllable switch, a source of the PMOS transistor forming a first terminal of the controllable switch, and a drain of the PMOS transistor forming a second terminal of the controllable switch.
3. The dual-power supply circuit of claim 1, wherein the cathode of the diode is connected to the backup power supply via a first resistor; the cathode of the diode is grounded through a second resistor; the cathode of the diode is connected with the control end of the controllable switch through a third resistor; the main power supply is connected with the anode of the diode through a fourth resistor.
4. The dual-power-supply circuit of claim 3, wherein the first resistor is composed of a resistor with a resistance of 2K to 4.7K, the second resistor is composed of a resistor with a resistance of 10K to 40K, the third resistor is composed of a resistor with a resistance of 10 Ω, and the fourth resistor is composed of a resistor with a resistance of 1K to 2K.
5. The dual power supply circuit of claim 1, wherein the second terminal of the controllable switch is used as an output terminal of the dual power supply circuit and is connected to an external load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020079763.0U CN210985739U (en) | 2020-01-14 | 2020-01-14 | Dual-power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020079763.0U CN210985739U (en) | 2020-01-14 | 2020-01-14 | Dual-power supply circuit |
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| Publication Number | Publication Date |
|---|---|
| CN210985739U true CN210985739U (en) | 2020-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020079763.0U Active CN210985739U (en) | 2020-01-14 | 2020-01-14 | Dual-power supply circuit |
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| CN (1) | CN210985739U (en) |
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2020
- 2020-01-14 CN CN202020079763.0U patent/CN210985739U/en active Active
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