Intelligent dual-power supply module

Abstract

The invention provides an intelligent dual-power supply module, and relates to the field of power supply. The intelligent dual-power-supply power supply module comprises a main power supply and a standby power supply, when the main power supply and the standby power supply supply power at the same time, the main power supply drives a base electrode of a triode Q3 and the triode Q3 to be conducted, so that Q1 is conducted, the main power supply supplies power to a load through the interior of an MOS, meanwhile, the main power supply drives an MOS tube Q5, the standby power supply is connected to GND through R8-R10-Q5, the MOS tube Q4 is in a disconnected state, and Q2 is also in a disconnected state. Because the standby power supply continuously outputs and has the same voltage with the main power supply, the two ends of the Q2 have the same voltage, and the body diode of the Q2 is not conducted, the main power supply does not flow back to the standby power supply. The intelligent dual-power-supply power supply module is used for a DC24V power supply system, when a main power supply and a standby power supply work on line at the same time, the main power supply is preferentially selected to work, and when the main power supply is powered off, the standby power supply continues to output and prevents the standby power supply from flowing backwards to the main power supply.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, in particular to an intelligent dual-power supply module. Background Art

[0002] With the advancement of science and technology, various industries have increasingly stringent requirements for power supply reliability and stability. Many applications require the use of two power supplies to ensure reliable power supply. Two power supplies operate simultaneously: a primary power supply and a backup power supply. The backup power supply maintains a continuous output state, allowing it to continue supplying power when the primary power supply fails. In this scenario, two diodes are typically used for reverse current protection. This solution utilizes the unidirectional conduction characteristics of the diode. If one power supply stops supplying power, current backflow will not occur between the two power supplies. Existing solutions involve a voltage drop between the anode and cathode of the diode. This voltage drop is even greater when the current is high, and the diode consumes a lot of power, resulting in energy waste. Summary of the Invention

[0003] The purpose of the present invention is to provide an intelligent dual-power supply module to solve the problems raised in the above background technology.

[0004] Technical Solution

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: an intelligent dual-power supply module, including a main power supply and a backup power supply. When the main power supply and the backup power supply are powered simultaneously, the main power supply drives the base of transistor Q3 and Q3 to be turned on, thereby turning on Q1, and the main power supply supplies power to the load through the inside of the MOS. At the same time, the main power supply drives the MOS tube Q5, and the backup power supply passes through R8-R10-Q5 to GND. The MOS tube Q4 is in a disconnected state, and Q2 is also in a disconnected state. The backup power supply is disconnected from the load and does not supply power to the load. Since the backup power supply continuously outputs and has the same voltage as the main power supply, the voltages at both ends of Q2 are equal, the body diode of Q2 is not turned on, and the main power supply will not flow back to the backup power supply.

[0006] When the main power supply is off, the gate voltage of Q5 is 0, Q5 is disconnected, the backup power supply drives Q4 to turn on, and thus Q2 is turned on, and the backup power supply supplies power to the load. At the same time, after the main power supply is off, the base drive current of the Q3 transistor is 0, the MOS tube Q1 is disconnected, and the backup power supply will not flow back to the main power supply. Until the main power supply returns to normal, the backup power supply is disconnected again, and the main power supply supplies power to the load.

[0007] Furthermore, considering the differences in devices, VD1 uses a 22V voltage regulator tube, and VD3 uses a 20V voltage regulator tube.

[0008] Furthermore, when the main power supply fails, it can ensure that Q1 is disconnected first and then Q2 is turned on, avoiding Q2 being turned on first and then the backup power being backflowed to the main power supply end, so that Q1 cannot be disconnected and the backup power continues to be backflowed to the main power supply end.

[0009] Furthermore, after the main power supply 24V passes through the voltage regulator tube VD1 (22V), the voltage is 2V, and the gate voltage of the MOS tube is 1-2V. Considering the difference in voltage regulator tube parameters, using a MOS tube at the Q3 position may cause the MOS tube to fail to turn on, so a transistor is used here.

[0010] Furthermore, the 24V-POW1 is the main power input terminal, 24V-POW2 is the backup power input terminal, 24V is the power output terminal, VD is the voltage regulator tube, and D is the bidirectional TVS tube.

[0011] The present invention provides an intelligent dual-power supply module. It has the following beneficial effects:

[0012] This intelligent dual power supply module is used in DC24V power supply systems. When the main power supply and backup power supply are working online at the same time, the main power supply is given priority. When the main power supply fails, the backup power supply continues to output and prevents the backup power from flowing back into the main power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a circuit diagram of the power supply module of the present invention. DETAILED DESCRIPTION

[0014] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0015] like Figure 1 As shown, an embodiment of the present invention provides an intelligent dual-power supply module, including a main power supply and a backup power supply. When the main power supply and the backup power supply are supplying power simultaneously, the main power supply drives the base of the transistor Q3 and Q3 to be turned on, thereby turning on Q1, and the main power supply supplies power to the load through the inside of the MOS. At the same time, the main power supply drives the MOS tube Q5, and the backup power supply passes through R8-R10-Q5 to GND. The MOS tube Q4 is in a disconnected state, and Q2 is also in a disconnected state. The backup power supply is disconnected from the load and does not supply power to the load. Since the backup power supply continuously outputs and has the same voltage as the main power supply, the voltages at both ends of Q2 are equal, the body diode of Q2 is not turned on, and the main power supply will not be backflowed to the backup power supply.

[0016] When the main power supply is powered off, the gate voltage of Q5 is 0, Q5 is disconnected, the backup power supply drives Q4 to turn on, and thus Q2 is turned on, and the backup power supply supplies power to the load. At the same time, after the main power supply is powered off, the base drive current of Q3 transistor is 0, the MOS tube Q1 is disconnected, and the backup power supply will not flow back to the main power supply until the main power supply returns to normal. The backup power supply is disconnected again, and the main power supply supplies power to the load. Taking into account the differences in devices, VD1 uses a 22V voltage regulator tube and VD3 uses a 20V voltage regulator tube. When the main power supply is powered off, it can ensure that Q1 is disconnected first and then Q2 is turned on, avoiding Q2 being turned on first and then the backup power being backflowed to the main power supply end, so that Q1 cannot be disconnected, causing the backup power to continue to flow back to the main power supply end. After the main power supply 24V passes through the voltage regulator tube VD1 (22V), the voltage is 2V, and the gate voltage of the MOS tube is 1-2V. Considering the difference in voltage regulator tube parameters, using a MOS tube at the Q3 position may cause the MOS tube to fail to turn on. Therefore, a transistor is used here. 24V-POW1 is the main power input terminal, 24V-POW2 is the backup power input terminal, 24V is the power output terminal, VD is the voltage regulator tube, D is the bidirectional TVS tube, and the main power supply uses MOS (one or more in parallel) to prevent backflow. The MOS is controlled by a transistor; the backup power supply uses MOS (one or more in parallel) as the switch control output, and a small MOS is used to control the switch MOS on and off.

[0017] Working principle: When the main power supply and the backup power supply are supplying power at the same time, the main power supply MOS is turned on to supply power to the load, and the backup power switch MOS is turned off at the same time. The backup power is disconnected from the load end. During this process, the main power supply is supplied; when the main power supply fails, the main power supply MOS is disconnected, and the backup power supply MOS is turned on to continue supplying power to the load. During this process, since the main power supply MOS is disconnected, the backup power will not flow back into the main power supply.

[0018] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An intelligent dual power supply module, including a main power supply and a backup power supply, characterized by: When the main power supply and the backup power supply are powered at the same time, the main power supply drives the base of the transistor Q3 and Q3 is turned on, so that Q1 is turned on, and the main power supply supplies power to the load through the inside of the MOS. At the same time, the main power supply drives the MOS tube Q5, and the backup power is connected to GND through R8-R10-Q5. The MOS tube Q4 is in the disconnected state, and Q2 is also in the disconnected state. The backup power supply is disconnected from the load and does not supply power to the load. Since the backup power supply continues to output and has the same voltage as the main power supply, the voltage across Q2 is the same, the body diode of Q2 is not turned on, and the main power supply will not be backflowed to the backup power supply; When the main power supply is off, the gate voltage of Q5 is 0, Q5 is disconnected, the backup power supply drives Q4 to turn on, and thus Q2 is turned on, and the backup power supply supplies power to the load. At the same time, after the main power supply is off, the base drive current of the Q3 transistor is 0, the MOS tube Q1 is disconnected, and the backup power supply will not flow back to the main power supply. Until the main power supply returns to normal, the backup power supply is disconnected again, and the main power supply supplies power to the load.

2. The intelligent dual power supply module according to claim 1, characterized in that: Taking into account the differences in devices, VD1 uses a 22V Zener diode and VD3 uses a 20V Zener diode.

3. The intelligent dual power supply module according to claim 1, characterized in that: When the main power supply fails, Q1 can be ensured to be disconnected first and then Q2 is turned on, so as to avoid Q2 being turned on first and then the backup power being backflowed to the main power supply end, so that Q1 cannot be disconnected and the backup power continues to be backflowed to the main power supply end.

4. The intelligent dual power supply module according to claim 1, characterized in that: After the main power supply 24V passes through the voltage regulator tube VD1 (22V), the voltage is 2V, and the gate voltage of the MOS tube is 1-2V. Considering the difference in voltage regulator tube parameters, using a MOS tube at the Q3 position may cause the MOS tube to fail to turn on, so a transistor is used here.

5. The intelligent dual power supply module according to claim 1, characterized in that: The 24V-POW1 is the main power input terminal, 24V-POW2 is the backup power input terminal, 24V is the power output terminal, VD is the voltage regulator tube, and D is the bidirectional TVS tube.

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