Power-off endurance control device

Abstract

The utility model relates to the technical field of uninterruptible power supplies, and discloses a power-off endurance control device in order to solve the technical problem that potential risks are caused due to the fact that an existing uninterruptible power supply lacks switching control. The triode Q5 is used for controlling the MOS tube, the control module U11 is used for controlling the triode Q5, the voltage reduction module U10 is used for supplying power to the control module U10, the power failure detection circuit is used for detecting an external input power supply, a drain electrode of the MOS tube is used for being connected with a positive electrode of a battery, and a source electrode of the MOS tube is connected with an input end of the voltage reduction module U10 through a diode D6. The output end of the voltage reduction module U10 is connected with the power supply end of the control module U11, the grid electrode of the MOS tube is connected with the collector electrode of the triode Q5, the emitter electrode of the triode Q5 is grounded, the base electrode of the triode Q5 is connected with the control port SW1 of the control module, and the control module U11 outputs high level through the control port SW1, so that the triode Q5 and the MOS tube Q4 are conducted, the battery BAT1 is switched to supply power, and continuous work is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of uninterruptible power supply, in particular to a power-off endurance control device. Background Art

[0002] Currently, the connection of network devices mainly relies on routers, which enable people to access the Internet in a variety of ways. However, existing routers are usually connected to the mains power supply through a power adapter, so when the mains power is cut off, the power supply of the router will also be interrupted, resulting in the interruption of wireless network connection and affecting people's work. This situation greatly limits the reliability and scope of use of wireless networks and routers.

[0003] The Chinese invention patent application document with the publication (announcement) number CN104638755A discloses a multi-voltage uninterruptible power supply suitable for a router, see its attached Figure 1 The battery is directly connected to the DC circuit converted by AC power. Although it can play a certain role, there is no effective control of the battery and no switching function. As long as there is AC power, the battery will be in a charging state. Over-charging the battery for a long time will cause danger or damage the battery. Utility Model Content

[0004] The utility model aims to provide a power-off endurance control device to solve the technical problem of potential risks caused by the lack of switching control in the existing uninterruptible power supply.

[0005] In order to achieve the above-mentioned purpose, the specific technical scheme of a power-off endurance control device of the utility model is as follows:

[0006] A power-off endurance control device comprises an input interface for connecting an external input power supply and an output interface for outputting the power supply, a diode D5 is arranged between the input interface and the output interface, and further comprises a MOS tube, a transistor Q5 for controlling the MOS tube, a control module U11 for controlling the transistor Q5, a step-down module U10 for supplying power to the control module U10, and a power-off detection circuit for detecting the external input power supply, wherein the drain of the MOS tube is used to be connected to the positive electrode of a battery, the source of the MOS tube is connected to the input end of the step-down module U10 through a diode D6, the output end of the step-down module U10 is connected to the power supply end of the control module U11, the gate of the MOS tube is connected to the collector of the transistor Q5, the emitter of the transistor Q5 is grounded, the base of the transistor Q5 is connected to the control port SW1 of the control module, and the cathodes of the diodes D5 and D6 are connected to the input end of the step-down module U10.

[0007] When the external input power is cut off, the device can automatically switch to battery power to ensure the continuous operation of the equipment and provide uninterrupted power supply. Through the control of MOS tubes and transistors, the system can remain stable during the power switching process to avoid the impact of voltage fluctuations on the equipment. The buck module U10 can step down the battery voltage to a suitable working voltage range for the control module U11 to ensure the stable operation of the control module. The setting of diodes D5 and D6 can prevent current backflow, protect the battery and buck module, and improve the reliability and life of the entire system. The power-off detection circuit can monitor the status of the external input power in real time, and start the battery power supply in time when the power is off to ensure the continuous operation of the equipment.

[0008] Furthermore, the MOS tube is a PMOS tube, and the transistor Q5 is an NPN transistor.

[0009] The combination of PMOS tube and NPN transistor has high switching speed and stability, and can quickly respond to changes in external input power, ensuring that the device quickly switches to battery power supply at the moment of power failure, thereby improving system reliability.

[0010] The PMOS tube has a lower on-resistance when turned on, which reduces the power consumption of the circuit. At the same time, the NPN transistor consumes less current during the control process, and the overall circuit has lower energy consumption, which extends the battery life.

[0011] Furthermore, the power-off detection circuit includes an NPN-type transistor Q6 and a PNP-type transistor U9. The positive electrode of the external input power supply is connected to the emitter of the transistor U9 through a diode D7. The positive electrode of the external input power supply is also connected to the base of the transistor U9 through a resistor R56. The collector of the transistor U9 is connected to the base of the transistor Q6 through a resistor R59. The emitter of the transistor Q6 is grounded. The collector of the transistor Q6 is connected to the output end of the buck module U10 through a pull-up resistor R61; the collector of the transistor Q6 is connected to the detection port DET1 of the control module U11, the positive electrode of the external input power supply is grounded through resistors R57 and R58 in turn, and the intermediate node of resistors R57 and R58 is connected to the detection port DET2 of the control module U11.

[0012] Through the detection ports DET1 and DET2 of the control module U11, the system can monitor the status of the external input power supply and the working status of the power failure detection circuit in real time, providing accurate feedback information for subsequent power management and fault handling. Detection of two ports in different states prevents false triggering and ensures that the power failure detection circuit responds only when the power is actually off.

[0013] The power-off endurance control device provided by the utility model has the following advantages:

[0014] When the external input power fails, the power failure detection circuit detects that the control module U11 outputs a high level through the control port SW1, so that the transistor Q5 is turned on, the MOS tube Q4 is turned on, and the power supply is switched to the battery BAT1 to ensure that the control module U11 and the device (such as a router) continue to work. The device can automatically switch to battery power supply to ensure that the device continues to operate safely and provide uninterrupted power supply. The setting of diodes D5 and D6 can prevent current backflow, protect the battery and the buck module, and improve the reliability and life of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The circuit diagram of the power-off endurance control device provided by the utility model;

[0016] Figure 2 This is a power failure detection circuit diagram provided by the utility model. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0018] See also Figure 1 The utility model provides a power-off endurance control device, including a battery BAT1, a triode Q8, a MOS tube Q4, a buck module U10 and a control module U11. The positive electrode of the battery BAT1 is connected to the input end of the buck module U10 through the MOS tube Q4 and the diode D6 in sequence. The ground end of the buck module U10 is grounded. The output end of the buck module U10 is connected to the power end of the control module U11 to supply power to the control module U11. The external input power supply (generally a power adapter) is connected to the input end of the buck module U10 through the diode D5, and the input end of the buck module U10 is grounded through the capacitor C31.

[0019] MOS tube Q4 is a PMOS tube, transistor Q5 is an NPN transistor, the gate of MOS tube Q4 is connected to the collector of transistor Q5, the collector of transistor Q5 is connected to the positive electrode of battery BAT1 through pull-up resistor R53, the emitter of transistor Q5 is grounded, and the base of transistor Q5 is connected to the SW1 port of control module U11 through resistor R54.

[0020] Specifically, the anode of the diode D6 is connected to the source of the MOS tube Q4, the cathode of the diode D6 is connected to the input end of the buck module U10, and the drain of the MOS tube Q4 is connected to the positive electrode of the battery BAT1. The anode of the diode D5 is used to be connected to the positive electrode of the external input power supply, and the cathode of the diode D5 is connected to the input end of the buck module U10.

[0021] The cathode of diode D5 is also connected to a filtering circuit, including four parallel capacitors C25, C26, C27 and C28, wherein capacitors C25 and C26 are 1000uF electrolytic capacitors for low-frequency filtering, capacitor C27 is used for medium-frequency filtering, and capacitor C28 is used for high-frequency filtering.

[0022] See also Figure 2 A power-off detection circuit is provided, including an NPN-type transistor Q6 and a PNP-type transistor U9. The positive electrode of the external input power supply is connected to the emitter of the transistor U9 through a diode D7. The positive electrode of the external input power supply is also connected to the base of the transistor U9 through a resistor R56. The collector of the transistor U9 is connected to the base of the transistor Q6 through a resistor R59. The emitter of the transistor Q6 is grounded. The collector of the transistor Q6 is connected to the output end of the step-down module U10 through a pull-up resistor R61.

[0023] The collector of transistor Q6 is connected to the detection port DET1 of control module U11. The positive electrode of the external input power supply is grounded through resistors R57 and R58 in sequence. Resistors R57 and R58 form a series voltage divider circuit. The middle node of resistors R57 and R58 is connected to the detection port DET2 of control module U11.

[0024] Specifically, the anode of the diode D7 is connected to the external input power supply, the cathode of the diode D7 is connected to the emitter of the transistor U9, a capacitor C32 is provided, the emitter of the transistor U9 is grounded through the capacitor C32, and the collector of the transistor U9 is grounded through the resistor R60.

[0025] Working principle:

[0026] When the external input power supply is powered, a voltage signal is output through the series voltage divider resistor and input to the detection port DET2 of the control module U11. The base of the transistor U9 is at a low level, and the transistor U9 is turned on. The external input power passes through the diode D7, the transistor U9, and the resistor R59 to the base of the transistor Q6. At this time, the transistor Q6 is turned on, so that the collector of the transistor Q6 is at a low level. The collector of the transistor Q6 is at the detection point of the control module U11, and the control module U11 detects that the point is at a low level. That is, when the external input power supply is powered, the detection port DET1 is at a low level, and the detection port DET2 is at a high level.

[0027] When the external input power supply is out of power, a low voltage signal is output through the series voltage divider resistor, the voltage division is zero, and the signal is input to the detection port DET2 of the control module U11, and the detection port DET2 is low level. At this time, the transistor Q6 is turned off, so that the collector of the transistor Q6 is high level, and the collector of the transistor Q6 is connected to the detection point of the control module U11, and the control module U11 detects that the point is high level. That is, when the external input power supply is powered, the detection port DET1 is high level, and the detection port DET2 is low level.

[0028] Using two detection ports is helpful to improve the detection accuracy and reduce the error probability of single port level detection.

[0029] When the control module U11 detects that the external input power supply has failed, the control module U11 acts on the base of the transistor Q5 through its port SW to generate a high-level signal, turning on the transistor Q5 to pull down the gate of the MOS tube Q4. The gate voltage is lower than the source voltage, and the MOS tube Q4 is turned on, that is, the battery BAT1 is switched to power the device.

[0030] The power-off endurance control device provided by the utility model has the following advantages:

[0031] The utility model provides a power-off endurance control device. When the external input power fails, it is detected by the power-off detection circuit, and the control module U11 outputs a high level through the control port SW1, so that the transistor Q5 is turned on, the MOS tube Q4 is turned on, and the power supply is switched to the battery BAT1, ensuring that the control module U11 and the device (such as a router, optical modem or set-top box) continue to work. The device can automatically switch to battery power supply to ensure that the device continues to operate and provide uninterrupted power supply. The setting of diodes D5 and D6 can prevent current backflow, protect the battery and the buck module, and improve the reliability and life of the entire system.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A power-off endurance control device, comprising an input interface for connecting an external input power source and an output interface for outputting a power source, wherein a diode D5 is provided between the input interface and the output interface, wherein: It also includes a MOS tube, a transistor Q5 for controlling the MOS tube, a control module U11 for controlling the transistor Q5, a buck module U10 for supplying power to the control module U10, and a power-off detection circuit for detecting an external input power supply. The drain of the MOS tube is used to be connected to the positive electrode of the battery, the source of the MOS tube is connected to the input end of the buck module U10 through a diode D6, the output end of the buck module U10 is connected to the power supply end of the control module U11, the gate of the MOS tube is connected to the collector of the transistor Q5, the emitter of the transistor Q5 is grounded, the base of the transistor Q5 is connected to the control port SW1 of the control module, and the cathodes of the diodes D5 and D6 are connected to the input end of the buck module U10.

2. A power-off endurance control device according to claim 1, characterized in that: The MOS tube is a PMOS tube, and the transistor Q5 is an NPN transistor.

3. A power-off endurance control device according to claim 2, characterized in that: The power-off detection circuit includes an NPN-type transistor Q6 and a PNP-type transistor U9. The positive electrode of the external input power supply is connected to the emitter of the transistor U9 through a diode D7. The positive electrode of the external input power supply is also connected to the base of the transistor U9 through a resistor R56. The collector of the transistor U9 is connected to the base of the transistor Q6 through a resistor R59. The emitter of the transistor Q6 is grounded. The collector of the transistor Q6 is connected to the output end of the buck module U10 through a pull-up resistor R61; the collector of the transistor Q6 is connected to the detection port DET1 of the control module U11, the positive electrode of the external input power supply is grounded through resistors R57 and R58 in turn, and the intermediate node of resistors R57 and R58 is connected to the detection port DET2 of the control module U11.

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