A power supply circuit having an auxiliary power supply

Abstract

The utility model relates to power supply circuit technical field, concretely relates to a power supply circuit with auxiliary power supply, including main power supply, auxiliary power supply, first input port, second input port, output port, MOS pipe Q1, on-off control component and diode D3. The utility model can supply power to the output port by MOS pipe Q1 to the main power supply when the main power supply is normal, and when the main power supply is powered off, the auxiliary power supply can switch automatically and supply power to the output port through diode D3, realize seamless succession of power supply, effectively guarantee the continuous power supply of output port, in addition, through setting first display component and second display component, when the main power supply is normal, the LED lamp D1 of first display component emits light, when the auxiliary power supply supplies power, the LED lamp D2 of second display component emits light, so that the user can clearly and intuitively understand the working state of the current power supply.

Description

Technical Field

[0001] This utility model relates to the field of power supply circuit technology, specifically to a power supply circuit with an auxiliary power supply. Background Technology

[0002] In the field of power supply circuit technology, a stable and reliable power supply system is crucial for the normal operation of various electronic devices. Under the main power supply mode, when the main power supply fails due to grid fluctuations, faults or other reasons, the internal circuit structure and control logic of the existing power supply circuit cannot achieve automatic and seamless switching of the auxiliary power supply, resulting in power interruption at the output port. This seriously affects the continuous and stable operation of the equipment and may cause adverse consequences such as data loss and equipment damage.

[0003] In addition, most existing power supply circuit designs do not integrate intuitive and effective power supply status display components. Users cannot obtain real-time information on the current working status of the main power supply or auxiliary power supply, making it difficult to judge the power supply status during equipment operation. This is not only detrimental to the daily maintenance and management of the equipment, but also significantly reduces the convenience and operating experience for users. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned shortcomings in the prior art by providing a power supply circuit with an auxiliary power source.

[0005] The objective of this utility model is achieved through the following technical solution: a power supply circuit with an auxiliary power supply, comprising a main power supply, an auxiliary power supply, a first input port, a second input port, and an output port; the main power supply and the auxiliary power supply are respectively connected to the first input port and the second input port;

[0006] The power supply circuit with auxiliary power supply also includes a MOSFET Q1 and a switching control component; the first input port is connected to the drain of the MOSFET Q1; the source of the MOSFET Q2 is connected to the output port; and the switching control component is connected to the gate of the MOSFET Q1.

[0007] The power supply circuit with auxiliary power supply also includes diode D3; the second input port is connected to the anode of diode D3; and the cathode of diode D3 is connected to the output port.

[0008] The present invention is further configured such that the on / off control component includes a transistor Q2, resistors R1, R2, and R3; the base of the transistor Q2 is connected to the first input port through resistor R1; the emitter of the transistor Q2 is grounded; the collector of the transistor Q2 is connected to the first input port through resistor R2; and the collector of the transistor Q2 is connected to the gate through resistor R3.

[0009] The present invention is further configured such that the MOS transistor Q2 is an N-type MOS transistor.

[0010] The present invention is further configured such that the transistor Q2 is an NPN transistor.

[0011] The present invention is further configured such that the power supply circuit with auxiliary power supply also includes a first display component for displaying the main power supply.

[0012] The present invention is further configured such that the first display component includes an operational amplifier U1 and an LED lamp D1; the positive input terminal of the operational amplifier U1 is connected to the first input port; the negative input terminal of the operational amplifier U1 is connected to a reference voltage; and the output terminal of the operational amplifier U1 is grounded through the LED lamp D1.

[0013] The present invention is further configured such that the power supply circuit with auxiliary power supply also includes a second display component for displaying the power supply of the auxiliary power supply.

[0014] The present invention is further configured such that the second display component includes an operational amplifier U2 and an LED lamp D2; the positive input terminal of the operational amplifier U2 is connected to the second input port; the negative input terminal of the operational amplifier U2 is connected to the first input port; and the output terminal of the operational amplifier U2 is grounded through the LED lamp D2.

[0015] The beneficial effects of this utility model are as follows: When the main power supply is working normally, the main power supply supplies power to the output port through MOSFET Q1; when the main power supply fails, the auxiliary power supply can automatically switch through diode D3 and supply power to the output port, realizing seamless power supply replacement and effectively ensuring continuous power supply to the output port; in addition, by setting a first display component and a second display component, when the main power supply is working normally, the LED D1 of the first display component lights up; when the auxiliary power supply is working, the LED D2 of the second display component lights up, allowing users to clearly and intuitively understand the current working status of the power supply. Attached Figure Description

[0016] Figure 1 This is the circuit schematic diagram of this utility model;

[0017] Wherein: 1. First input port; 2. Second input port; 3. Output port. Detailed Implementation

[0018] The present invention will be further described in conjunction with the following embodiments.

[0019] Depend on Figure 1As can be seen, the power supply circuit with auxiliary power supply described in this embodiment includes a main power supply, an auxiliary power supply, a first input port 1, a second input port 2, and an output port 3; the main power supply and the auxiliary power supply are respectively connected to the first input port 1 and the second input port 2; the power supply circuit with auxiliary power supply also includes a MOSFET Q1 and a switching control component; the first input port 1 is connected to the drain of the MOSFET Q1; the source of the MOSFET Q1 is connected to the output port 3; the switching control component is connected to the gate of the MOSFET Q1; the power supply circuit with auxiliary power supply also includes a diode D3; the second input port 2 is connected to the anode of the diode D3; the cathode of the diode D3 is connected to the output port 3. This embodiment describes a power supply circuit with an auxiliary power supply. The on / off control component includes a transistor Q2, resistors R1, R2, and R3. The base of transistor Q2 is connected to the first input port 1 via resistor R1; the emitter of transistor Q2 is grounded; the collector of transistor Q2 is connected to the first input port 1 via resistor R2; and the collector of transistor Q2 is connected to the gate via resistor R3. In this embodiment, the MOSFET Q2 is an N-type MOSFET. In this embodiment, the transistor Q2 is an NPN transistor.

[0020] Specifically, in the power supply circuit with auxiliary power supply described in this embodiment, under normal circumstances, the voltage of the main power supply is greater than the voltage of the auxiliary power supply. The first input port 1 provides bias current to the base of transistor Q2 through resistor R1. Since transistor Q2 is an NPN type, it satisfies the conditions of forward bias of the emitter junction and reverse bias of the collector junction, that is, the base potential is greater than the emitter potential. The collector is connected to the first input port 1 through resistor R2, and the collector potential is also high, thereby turning on transistor Q2. After transistor Q2 turns on, the collector potential of transistor Q2 is pulled down. Since MOSFET Q1 is an N-type MOSFET, its gate is connected to the collector of transistor Q2 via resistor R3. The source of MOSFET Q1 is connected to output port 3, and its drain is connected to the first input port 1. Because transistor Q2 is turned on, the gate potential of MOSFET Q1 is approximately ground. The drain of MOSFET Q1 is relatively large, forming a positive voltage difference with its gate, which satisfies the conduction condition of an N-type MOSFET, thus turning on Q1. The main power supply is supplied from the first input port 1 to the output port 3 through MOSFET Q1.

[0021] In addition, since the voltage of the first input port 1 is greater than the voltage of the second input port 2, and the output port 3 is powered by the first input port 1, the voltage of the output port 3 is close to the voltage of the first input port 1. The anode of the diode D3 is connected to the second input port 2. At this time, the cathode potential of the diode D3 is greater than the anode potential of the diode D3, so the diode D3 is reverse biased and cut off, and the auxiliary power supply connected to the second input port 2 does not participate in the power supply.

[0022] When the main power supply at the first input port 1 is de-energized, resistor R1 cannot provide bias to the base of transistor Q2, causing Q2 to cut off due to the lack of current at its base. After transistor Q2 is de-energized, its collector potential is pulled up by resistor R2, preventing the gate potential of MOSFET Q1 from being pulled low by transistor Q2. Simultaneously, because the first input port 1 is de-energized, there is no voltage input to the drain of MOSFET Q1, causing MOSFET Q1 to tend to cut off and no longer draw power from the first input port 1.

[0023] In addition, the auxiliary power supply acts on the anode of diode D1 through the second input port 2. At this time, the output port 3 loses power supply due to the power failure of the first input port 1. The cathode potential of diode D1 decreases. When the voltage of the second input port 2 is greater than the voltage of the output port 3, diode D1 is forward biased and conducts. The auxiliary power supply supplies power to the output port 3 from the second input port 2 through diode D1, realizing power supply replacement and ensuring continuous output from the output port 3.

[0024] This embodiment describes a power supply circuit with an auxiliary power supply, which further includes a first display component for displaying the main power supply. The first display component includes an operational amplifier U1 and an LED D1; the positive input terminal of the operational amplifier U1 is connected to a first input port 1; the negative input terminal of the operational amplifier U1 is connected to a reference voltage; and the output terminal of the operational amplifier U1 is grounded through the LED D1.

[0025] Specifically, when the main power supply is working normally, the voltage at the first input port 1 is greater than the reference voltage, which causes the operational amplifier U1 to output voltage to the LED D1, and the LED D1 lights up to remind the user that the main power supply is being used at this time; when the main power supply fails, the voltage at the first input port 1 is less than the reference voltage, the operational amplifier U1 cannot output voltage to the LED D1, and the LED D1 turns off.

[0026] This embodiment describes a power supply circuit with an auxiliary power supply. The auxiliary power supply circuit further includes a second display component for displaying the power supplied by the auxiliary power supply. The second display component includes an operational amplifier U2 and an LED D2. The positive input terminal of the operational amplifier U2 is connected to a second input port 2; the negative input terminal of the operational amplifier U2 is connected to a first input port 1; and the output terminal of the operational amplifier U2 is grounded through the LED D2.

[0027] Specifically, when the main power supply is working normally, the voltage at the first input port 1 is greater than the auxiliary power supply voltage at the second input port 2, so the operational amplifier U2 cannot output voltage to the LED D2, and the LED D2 is off; when the main power supply is off, the auxiliary power supply voltage at the second input port 2 is greater than the voltage at the first input port 1, so the operational amplifier U2 outputs voltage to the LED D2, and the LED D2 lights up to remind the user that the auxiliary power supply is used at this time.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A power supply circuit with an auxiliary power supply, characterized in that: It includes a main power supply, an auxiliary power supply, a first input port (1), a second input port (2), and an output port (3); the main power supply and the auxiliary power supply are respectively connected to the first input port (1) and the second input port (2); The power supply circuit with auxiliary power supply also includes a MOSFET Q1 and an on / off control component; the first input port (1) is connected to the drain of the MOSFET Q1; the source of the MOSFET Q2 is connected to the output port (3); the on / off control component is connected to the gate of the MOSFET Q1. The power supply circuit with auxiliary power supply also includes diode D3; the second input port (2) is connected to the anode of diode D3; the cathode of diode D3 is connected to the output port (3).

2. The power supply circuit with auxiliary power supply according to claim 1, characterized in that: The on / off control component includes a transistor Q2, resistors R1, R2, and R3; the base of transistor Q2 is connected to the first input port (1) through resistor R1; the emitter of transistor Q2 is grounded; the collector of transistor Q2 is connected to the first input port (1) through resistor R2; and the collector of transistor Q2 is connected to the gate through resistor R3.

3. A power supply circuit with an auxiliary power supply according to claim 2, characterized in that: The MOSFET Q2 is an N-type MOSFET.

4. A power supply circuit with an auxiliary power supply according to claim 2, characterized in that: The transistor Q2 is an NPN transistor.

5. A power supply circuit with an auxiliary power supply according to claim 1, characterized in that: The power supply circuit with auxiliary power also includes a first display component for displaying the main power supply.

6. A power supply circuit with an auxiliary power supply according to claim 5, characterized in that: The first display component includes an operational amplifier U1 and an LED lamp D1; the positive input terminal of the operational amplifier U1 is connected to the first input port (1); the negative input terminal of the operational amplifier U1 is connected to a reference voltage; and the output terminal of the operational amplifier U1 is grounded through the LED lamp D1.

7. A power supply circuit with an auxiliary power supply according to claim 1, characterized in that: The power supply circuit with auxiliary power supply also includes a second display component for displaying the power supply of the auxiliary power supply.

8. A power supply circuit with an auxiliary power supply according to claim 7, characterized in that: The second display component includes an operational amplifier U2 and an LED D2; the positive input terminal of the operational amplifier U2 is connected to the second input port (2); the negative input terminal of the operational amplifier U2 is connected to the first input port (1); and the output terminal of the operational amplifier U2 is grounded through the LED D2.

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