CN220732421U

CN220732421U - Backup power supply system and power supply system

Info

Publication number: CN220732421U
Application number: CN202322428249.XU
Authority: CN
Inventors: 李长健
Original assignee: Shenzhen Weite Medical Co ltd
Current assignee: Shenzhen Weite Medical Co ltd
Priority date: 2023-09-06
Filing date: 2023-09-06
Publication date: 2024-04-05
Anticipated expiration: 2033-09-06

Abstract

The application relates to the technical field of power sources and discloses a backup power supply system and power supply system, backup power supply system connects between backup power input end and power output end, backup power supply system includes: the device comprises a boosting module, a control output switch module and a comparison output module; the boost module is respectively connected with the backup power input end and the control output switch module, the control output switch module is connected with the first input end of the comparison output module, the second input end of the comparison output module is externally connected with the output end of the main power supply, and the output end of the comparison output module is connected with the power output end. Therefore, the hardware cost of the power supply detection circuit can be reduced, and the speed of the output of the standby power supply can be improved.

Description

Backup power supply system and power supply system

Technical Field

The application relates to the technical field of power supplies, in particular to a backup power supply system and a power supply system.

Background

In the prior art, the common backup power supply is an online backup power supply, and the online backup power supply is output through the output switch all the time regardless of whether the main power supply is normally output, so that the power consumption is higher, and the service life of the backup battery is influenced. In order to reduce the power consumption of the backup power supply, a power supply detection circuit is generally added to the main power supply, and when the failure of the main power supply is detected, the backup power supply is immediately started to output.

Disclosure of Invention

The main purpose of the present application is to provide a backup power supply system and a power supply system, which aims to reduce the hardware cost of a power supply detection circuit and increase the output speed of the backup power supply.

To achieve the above object, the present application provides a backup power supply system, which is connected between a backup power input end and a power output end, the backup power supply system includes: the device comprises a boosting module, a control output switch module and a comparison output module;

the boost module is respectively connected with the backup power input end and the control output switch module, the control output switch module is connected with the first input end of the comparison output module, the second input end of the comparison output module is externally connected with the output end of the main power supply, and the output end of the comparison output module is connected with the power output end.

Optionally, the comparison output module includes: a first diode and a second diode;

the first input end is connected with the first end of the first diode, the first end of the second diode is connected with the second input end, and the second end of the second diode is connected with the second end of the first diode and the power output end respectively.

Optionally, the control output switch module includes: a switching circuit and a voltage conversion circuit;

the voltage boosting module is connected with the first diode through the switch circuit, and the voltage conversion circuit is respectively connected with the switch circuit and a first preset enabling control end.

Optionally, the switching circuit includes: a first transistor and a first resistor;

the first end of the first resistor is connected with the boost module and the first end of the first transistor respectively, the second end of the first resistor is connected with the control end of the first transistor and the voltage conversion circuit respectively, and the second end of the first transistor is connected with the first diode.

Optionally, the voltage conversion circuit includes: a second transistor, a second resistor, and a third resistor;

the control end of the second transistor is connected with the first end of the second resistor and the first end of the third resistor respectively, the second end of the second resistor is connected with the first preset enabling control end, the first end of the second transistor is connected with the second end of the first resistor and the control end of the first transistor respectively, and the second end of the second transistor is connected with the second end of the third resistor and grounded.

Optionally, the boosting module includes: the first control chip, the inductor, the fourth resistor, the fifth resistor and the sixth resistor;

the standby power supply input end is respectively connected with the first end of the inductor and the first control chip, the second end of the inductor is respectively connected with the first control chip and the first end of the fourth resistor, the second end of the fourth resistor is respectively connected with the first control chip and the first end of the sixth resistor through the fifth resistor, and the second end of the sixth resistor is grounded.

Optionally, the boosting module further includes: a first capacitor and a second capacitor;

the first end of the first capacitor is respectively connected with the backup power input end, the first control chip and the first end of the inductor, and the second end of the first capacitor is grounded;

the first end of the second capacitor is connected with the second end of the inductor and the first end of the fourth resistor respectively, and the second end of the second capacitor is grounded.

Optionally, the boosting module further includes: a seventh resistor;

the first end of the seventh resistor is connected with the second preset enabling control end and the first control chip respectively, and the second end of the seventh resistor is grounded.

Optionally, the boosting module further includes: a third diode;

the first end of the third diode is connected with the second end of the inductor, and the second end of the third diode is connected with the first end of the fourth resistor and the control output switch module respectively.

In addition, to achieve the above object, the present application provides a power supply system including the backup power supply system and the main power supply as described above.

The application provides a backup power supply system, backup power supply system connects between backup power input and power output, backup power supply system includes: the device comprises a boosting module, a control output switch module and a comparison output module; the boost module is respectively connected with the backup power input end and the control output switch module, the control output switch module is connected with the first input end of the comparison output module, the second input end of the comparison output module is externally connected with the output end of the main power supply, and the output end of the comparison output module is connected with the power output end. According to the power supply system, under the condition that the main power supply is effective, the power supply system does not work by adopting the backup power supply sent by the control output switch circuit, so that the power consumption of the backup power supply is reduced, under the condition that the main power supply fails, the comparison output module immediately switches the output of the backup power supply, uninterrupted output is realized, the stable work of the power supply system is ensured, further, the power supply detection circuit is not required to be added on the main power supply, and whether the main power supply fails or not is not required to be always detected, so that the hardware cost is greatly reduced, and the output speed of the backup power supply is improved.

Drawings

FIG. 1 is a schematic diagram of a frame structure of an embodiment of a backup power supply system of the present application;

FIG. 2 is a schematic circuit diagram of a comparison output module of the backup power supply system of the present application;

FIG. 3 is a schematic diagram of a control output switch module of the backup power supply system of the present application;

FIG. 4 is a schematic diagram of the circuit connections of the switching circuit and the voltage conversion circuit of the backup power supply system of the present application;

FIG. 5 is a schematic circuit diagram of a boost module of the backup power supply system of the present application;

fig. 6 is a load connection schematic diagram of an embodiment of the back-up power supply system of the present application.

Reference numerals illustrate:

the realization, functional characteristics and advantages of the present application will be further described with reference to the embodiments, referring to the attached drawings.

Detailed Description

It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present application are merely used to explain the relative positional relationship, movement, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is correspondingly changed.

In the present application, unless explicitly specified and limited otherwise, the terms "coupled," "secured," and the like are to be construed broadly, and for example, "secured" may be either permanently attached or removably attached, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In addition, descriptions such as those related to "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated in this application. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be regarded as not exist and not within the protection scope of the present application.

The application provides a backup power supply system.

In an embodiment of the present application, referring to fig. 1, fig. 1 is a schematic diagram of a frame structure of an embodiment of a backup power supply system of the present application, a backup power supply system a is connected between a backup power input end VCC1_bat and a power output end vcc_out, and the backup power supply system a includes: a boost module 10, a control output switch module 20, and a comparison output module 30;

the boost module 10 is respectively connected with the backup power input end VCC1_bat and the control output switch module 20, the control output switch module 20 is connected with the first input end of the comparison output module 30, the second input end of the comparison output module is externally connected with the output end VCC2_out of the main power supply, and the output end of the comparison output module 30 is connected with the power output end vcc_out.

The back-up power supply system is a system for controlling the output of the back-up power supply in the power supply system.

In this embodiment, the boost module 10 boosts the backup power input voltage of the backup power input terminal VCC1_bat to obtain a backup power output voltage, and sends the backup power output voltage to the control output switch module 20, the backup power output voltage received by the control output switch module 20 is sent to the first input terminal of the comparison output module 30, the second input terminal of the comparison output module 30 is externally connected with the output terminal VCC2_out of the main power, the comparison output module 30 compares the first input terminal with the second input terminal and then outputs the electric energy of the main power to the power output terminal vcc_out when detecting that the output voltage of the main power exists at the output terminal VCC2_out, and when detecting that the output voltage does not exist at the output terminal VCC2_out of the main power, the boosted backup power input voltage sent by the control output switch module 20 is output to the power output terminal vcc_out, thereby preventing whether the main power is normally output, leading to higher power consumption, and also without increasing the cost of the main power detection circuit, and based on the direct output of the first input terminal VCC2_out or the backup power, the backup power output voltage is not required, and further determining whether the backup power output voltage is greatly output by the first output terminal, or the backup power output voltage is greatly failed.

That is, in the present application, the power supply system does not adopt the control output switch circuit 20 to send the backup power to work under the condition that the main power is effective, thereby reducing the power consumption of the backup power, about 0.1uA, under the condition that the main power fails, the comparison output module 30 immediately switches the output of the backup power, realizing uninterrupted output, ensuring the stable work of the power supply system, and further, not needing to add a power detection circuit on the main power, thereby greatly reducing the hardware cost and improving the output speed of the backup power.

Illustratively, the voltage boosting module 10 boosts the voltage of the backup power input VCC1_bat from 3.7V to 5.6V and sends the boosted voltage to the control output switch module 20, and the voltage of the output VCC2_out of the main power is 5.7V, at this time, the comparison output module 30 directly outputs the voltage of the main power to the power output vcc_out for use by the power output vcc_out when detecting that the voltage of the output power of the main power is greater than the output voltage of the backup power sent by the control output switch module 20, i.e., the voltage of 5.7V is greater than 5.6V. When the main power fails, the voltage of the main power drops or directly reaches 0V, and if the comparison output module 30 detects that the voltage of the main power is smaller than the output voltage of the backup power sent by the control output switch module 20, the voltage of the backup power sent by the control output switch module 20 is directly output to the power output terminal vcc_out, so as to be used by the power output terminal vcc_out.

In this embodiment, referring to fig. 6, fig. 6 is a schematic load connection diagram of an embodiment of a backup power supply system of the present application, a power output end vcc_out provides power for an upper load and a lower load respectively, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5 are connected with a second control chip U2, a first end of the fifth capacitor C5 is connected with a peripheral 3V power vcc_3v, a second end of the fifth capacitor C5 is grounded, a power output end vcc_out is connected with a peripheral 5V power vcc_5v, a sixth capacitor C6, a seventh capacitor C7 and an eighth resistor R8 are connected with the third control chip U3, a first end of the seventh capacitor C5 is connected with a peripheral 3V power vcc_3v, and a second end of the eighth resistor R8 is grounded. Thus, the power output vcc_out of the backup power supply system supplies power to the load. The second control chip U2 and the third control chip U3 are used for converting the output voltage in the power supply system into the voltage required by other loads, and can be replaced by various LDO voltage reduction or DC-DC voltage reduction circuits, so that the influence on the backup power supply system is not great.

Optionally, in some possible embodiments, referring to fig. 2, fig. 2 is a schematic circuit diagram of a comparison output module of the backup power supply system of the present application, where the comparison output module 30 includes: a first diode D1 and a second diode D2;

the first input end is connected with the first end of the first diode D1, the first end of the second diode D2 is connected with the second input end, and the second end of the second diode D2 is connected with the second end of the first diode D1 and the power output end respectively.

It should be noted that, the second diode D2 of the first diode D1 is a schottky diode, the type is SS34, the 3A current can pass, and the maximum voltage drop is not more than 0.5V, and due to the voltage drop, the voltage input to the comparison output module 30 needs to be 0.5V higher than the system required voltage, for example, the main power voltage is set to 5.7V, and the backup power voltage is set to 5.6V, so the operation state is output by the main power. The control output switch module 20 is connected to the first end of the first diode D1, and the first end of the second diode D2 is externally connected to the output end of the main power supply.

In this embodiment, when the output terminal VCC2_out of the main power supply is active, the voltage of the first terminal of the second diode D2 is higher than the voltage of the second terminal of the second diode D2, so that the second diode D2 is turned on, and at this time, the voltage of the first terminal of the first diode D1 is lower than the voltage of the second terminal of the first diode D1, and the power supply system outputs the electric energy through the main power supply. When the output terminal VCC2_out of the main power supply fails, the voltage of the first terminal of the second diode D2 is lower than the voltage of the second terminal of the second diode D2, the second diode D2 is turned off and is not turned on, the voltage of the first terminal of the first diode D1 is higher than the voltage of the second terminal of the first diode D1, the first diode D1 is turned on, and the power supply system outputs power through the backup power supply, that is, outputs power based on the backup power supply output by the control output switch module 20. Therefore, the power supply system does not work by adopting the backup power supply sent by the control output switch circuit 20 under the condition that the main power supply is effective, so that the power consumption of the backup power supply is reduced, the comparison output module 30 immediately switches the output of the backup power supply under the condition that the main power supply is invalid, uninterrupted output is realized, the stable work of the power supply system is ensured, and furthermore, a power supply detection circuit is not required to be added on the main power supply, so that the hardware cost is greatly reduced, and the output speed of the backup power supply is improved.

Alternatively, in some possible embodiments, referring to fig. 3, fig. 3 is a schematic frame diagram of a control output switch module of the backup power supply system of the present application, where the control output switch module 20 includes: a switching circuit 21 and a voltage conversion circuit 22;

the boost module 30 is connected to the first diode D1 through the switch circuit 21, and the voltage conversion circuit 22 is connected to the switch circuit 21 and a first preset enable control terminal output_en1, respectively.

It should be noted that, the first preset enable control terminal output_en1 is a control signal sent by the MCU ((Microcontroller Unit, micro control unit)) of the system, the voltage conversion circuit 22 is controlled by the power supply system through the first preset enable control terminal output_en1, and since the control signal OUTPUT by the MCU is a low voltage signal and the driving capability is low, the voltage of 0 to 3.3V is converted into 0 to 5V by the voltage conversion circuit 22 and then is supplied to the switch circuit 21.

In the present embodiment, the switching circuit 21 is connected between the boosting module 10 and the comparison OUTPUT module 30, and the voltage converting circuit 22 is connected with the switching circuit 21 and the second preset enable control terminal output_en1. Thus, the switch circuit 21 controls whether the boosted backup power supply input voltage sent by the boost module 10 is output to the comparison output module 30, so that the power supply system does not adopt the control output of the backup power supply sent by the switch circuit 20 to work under the condition that the main power supply is effective, thereby reducing the power consumption of the backup power supply, and the comparison output module 30 immediately switches the backup power supply output under the condition that the main power supply is invalid, realizing uninterrupted output, ensuring the stable work of the power supply system, and further, not needing to add a power supply detection circuit on the main power supply, thereby greatly reducing the hardware cost and improving the speed of the backup power supply output.

Alternatively, in some possible embodiments, referring to fig. 4, fig. 4 is a schematic circuit connection diagram of a switching circuit and a voltage conversion circuit of the backup power supply system of the present application, where the switching circuit 21 includes: a first transistor Q1 and a fifth resistor;

the first end of the first resistor R1 is connected to the boost module 10 and the first end of the first transistor Q1, the second end of the first resistor R1 is connected to the control end of the first transistor Q1 and the voltage conversion circuit 22, and the second end of the first transistor Q1 is connected to the first diode D1.

Note that, the first transistor Q1 is a P-type MOS transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET), the control terminal of the first transistor Q1 is a gate, the first terminal of the first transistor Q1 is a source, and the second terminal of the first transistor Q1 is a drain. The first transistor Q1 can be replaced by a PMOS transistor with larger power of the same type, so that control and output of higher power are realized. The first resistor R1 keeps the control terminal of the first transistor Q1 at 0-5.6V.

In this embodiment, the first transistor Q1 is controlled by a program of the power supply system, so that, for whether to output the boosted backup power supply input voltage output by the boost module 10 to the comparison output module 30, the first resistor R1 is used to ensure that the state of the first transistor Q1 is stable, after the control terminal of the first transistor Q1 receives the control signal so that the first transistor Q1 is turned on, the boosted backup power supply input voltage at the first terminal of the first transistor Q1 is transmitted to the first diode D1 through the second terminal of the first transistor Q1, and thus, in the case that the main power supply is active, the voltage at the first terminal of the second diode D2 is greater than the voltage at the second terminal, so that the voltage at the first terminal of the first diode D1 is lower than the second terminal of the first diode D1, so that the power supply system outputs the power of the main power supply to the power supply output terminal. When the output terminal VCC2_out of the main power supply fails, the voltage of the first terminal of the second diode D2 is lower than the voltage of the second terminal of the second diode D2, the second diode D2 is turned off and is not turned on, the voltage of the first terminal of the first diode D1 is higher than the voltage of the second terminal of the first diode D1, the first diode D1 is turned on, and the power supply system outputs power through the backup power supply, that is, outputs power based on the backup power supply output by the control output switch module 20. Therefore, the power supply system does not work by adopting the backup power supply sent by the control output switch circuit 20 under the condition that the main power supply is effective, so that the power consumption of the backup power supply is reduced, the comparison output module 30 immediately switches the output of the backup power supply under the condition that the main power supply is invalid, uninterrupted output is realized, the stable work of the power supply system is ensured, and furthermore, a power supply detection circuit is not required to be added on the main power supply, so that the hardware cost is greatly reduced, and the output speed of the backup power supply is improved.

Alternatively, in some possible embodiments, referring to fig. 4, the voltage conversion circuit 22 includes: a second transistor Q2, a second resistor R2, and a third resistor R3;

the control end of the second transistor Q2 is connected to the first end of the second resistor R2 and the first end of the third resistor R3, the second end of the second resistor R2 is connected to the first preset enable control end output_en1, the first end of the second transistor Q2 is connected to the second end of the first resistor R1 and the control end of the first transistor Q1, and the second end of the second transistor R2 is connected to the second end of the third resistor R3 and grounded.

Note that, the second transistor Q2 is an N-type MOS transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET), the control terminal of the second transistor Q2 is a gate, the first terminal of the second transistor Q2 is a source, and the second terminal of the second transistor Q2 is a drain. The third resistor R3 ensures that the state of the second transistor Q2 is stable, and the second resistor R2 protects the gate of the third resistor R3.

In this embodiment, the MCU of the power supply system controls the second transistor Q2 to be turned on through the first preset enable control terminal output_en1, so that the voltage of 0 to 3.3V is converted into 0 to 5V through the second transistor Q2, the second resistor R2 and the third resistor R3 and then is supplied to the first transistor Q1, so that the boosted backup power OUTPUT low voltage sent by the boost module 10 is sent to the first diode D1, and thus, the power supply system does not work by adopting the backup power sent by the control OUTPUT switch circuit 20 under the condition that the main power is effective, and thus, the power consumption of the backup power is reduced, and under the condition that the main power fails, the comparison OUTPUT module 30 immediately switches the backup power OUTPUT, thereby realizing uninterrupted OUTPUT, ensuring the stable work of the power supply system, and further, without adding a power detection circuit to the main power, thereby greatly reducing the hardware cost and improving the speed of the backup power OUTPUT.

Alternatively, in some possible embodiments, referring to fig. 5, fig. 5 is a schematic circuit diagram of a boost module of the backup power supply system of the present application, where the boost module 10 includes: the first control chip U1, the inductor L, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6;

the standby power supply input end VCC1_BAT is respectively connected with the first end of the inductor L and the first control chip U1, the second end of the inductor L is respectively connected with the first control chip U1 and the first end of the fourth resistor, the second end of the fourth resistor R4 is respectively connected with the first ends of the first control chip U1 and the sixth resistor through the fifth resistor R5, and the second end of the sixth resistor R6 is grounded.

It should be noted that, the specific model of the first control chip U1 may be SX1308, the soft start function built in the first control chip U1 reduces the starting impact current, the first control chip U1 automatically switches to the PFM (pulse frequency modulation) mode when in light load, and the first control chip U1 includes the functions of under-voltage locking, current limiting and overheat protection, and saves more space for the PCB (Printed Circuit Board ) based on the small-sized package of the first control chip U1. The fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 are used to regulate the backup power output voltage after the boosting module 10 boosts, and the backup power output voltage is specifically referred to in the following formula,

wherein R in the formula ₁ Is the sum of a fourth resistor R4 and a fifth resistor R5, R ₂ For a sixth resistance R6, V _REF For the voltage before boosting, i.e. the back-up power supply input VCC1_BAT, V _OUT And outputting voltage for a backup power supply.

In this embodiment, the inductor L stores energy, so that after the energy is stored by the inductor L, the voltage of the input end VCC1_bat of the backup power supply is boosted by the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 to obtain the output voltage of the backup power supply, and the output voltage of the backup power supply is sent to the control output switch circuit 20, and the control output switch circuit 20 receives the output voltage of the backup power supply and sends the output voltage to the first input end of the comparison output module 30.

The 5 th pin of the first control chip U1 is a power input terminal IN, the 5 th pin of the first control chip U1 is connected to the backup power input terminal VCC1_bat and the first end of the inductor L, the 1 st pin of the first control chip U1 is a pulse control terminal, the 1 st pin of the first control chip U1 is connected to the inductor L and the fourth resistor R4, the 3 rd pin of the first control chip U1 is a feedback terminal FB, the 3 rd pin of the first control chip U1 is connected to the fifth resistor R5 and the fourth resistor R4, and after the 3 rd pin of the first control chip U1 receives the feedback signal, the pulse frequency of the 1 st pin is changed by the first control chip U1 based on the feedback signal.

Illustratively, the voltage of the output terminal VCC2 OUT of the main power supply is 5.7V by raising the voltage of the backup power supply input terminal VCC1_bat to 5.6V through the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 and then sending the raised voltage to the control output switch module 20. Under the condition that the main power supply is effective, the voltage of the first end of the D2 of the second diode is larger than the voltage of the second end, so that the D2 of the second diode is conducted, the voltage of the first end of the first diode D1 is lower than the second end of the first diode D1, the D2 of the second diode is cut off, and the power supply system outputs the electric energy of the main power supply to the power supply output end. When the output terminal VCC2_out of the main power supply fails, the voltage of the first terminal of the second diode D2 is lower than the voltage of the second terminal of the second diode D2, the second diode D2 is turned off and is not turned on, the voltage of the first terminal of the first diode D1 is higher than the voltage of the second terminal of the first diode D1, the first diode D1 is turned on, and the power supply system outputs power through the backup power supply, that is, outputs power based on the backup power supply output by the control output switch module 20. Therefore, the power supply system does not work by adopting the backup power supply sent by the control output switch circuit 20 under the condition that the main power supply is effective, so that the power consumption of the backup power supply is reduced, the comparison output module 30 immediately switches the output of the backup power supply under the condition that the main power supply is invalid, uninterrupted output is realized, the stable work of the power supply system is ensured, and furthermore, a power supply detection circuit is not required to be added on the main power supply, so that the hardware cost is greatly reduced, and the output speed of the backup power supply is improved.

Optionally, in some possible embodiments, the boost module 10 further includes: a first capacitor C1 and a second capacitor C2;

the first end of the first capacitor C1 is respectively connected with the backup power input end VCC1_BAT, the first control chip U1 and the first end of the inductor L, and the second end of the first capacitor C1 is grounded;

the first end of the second capacitor C2 is connected to the second end of the inductor L and the first end of the fourth resistor R4, respectively, and the second end of the second capacitor C2 is grounded.

In this embodiment, the 5 th pin of the first control chip U1 is connected to the first end of the backup power input end VCC1_bat and the first end of the first capacitor, the first capacitor C1 is a coupling capacitor, when the inductor L is energized, the power is preferentially taken through the first capacitor C1, the second capacitor C2 makes the boosted backup power output voltage output by the boost module 10 preferentially pass, so as to ensure output stability, thereby, the backup power output voltage is sent to the control output switch circuit 20, after the control output switch circuit 20 receives the backup power output voltage, the backup power output voltage is sent to the first input end of the comparison output module 30, the comparison output module 30 compares the first input end with the second input end, when the output end VCC2_out of the main power is detected to have output voltage, when the output end VCC2_out of the main power is detected to have no output voltage, the boosted backup power input voltage sent by the control output switch module 20 is output to the power output end_out, thus, by the control output switch circuit 20 is not adopted under the condition that the main power is effective, the backup power output system is not used, the power consumption is reduced, and the power consumption is not increased, and the power consumption is increased immediately, and the power is not required to be output by the backup power system.

Optionally, in some possible embodiments, the boost module 30 further includes: a seventh resistor R7;

the first end of the seventh resistor R7 is connected to the second preset enable control end output_en2 and the first control chip U1, and the second end of the seventh resistor R7 is grounded.

In this embodiment, when the power supply system is turned off, the first control chip U1 of the boost module 30 enables the pin EN to pull down a resistor of 100KR, so that the boost module is in a sleep state, which reduces battery loss to the maximum extent, and prevents continuous operation through the boost module 30 when the power supply system is turned off. Therefore, the backup power supply output voltage is sent to the control output switch circuit 20, and after the control output switch circuit 20 receives the backup power supply output voltage, the backup power supply output voltage is sent to the first input end of the comparison output module 30, and under the condition that the main power supply is effective, the power supply system does not work by adopting the backup power supply sent by the control output switch circuit 20, so that the power consumption of the backup power supply is reduced by about 0.1uA, and under the condition that the main power supply fails, the comparison output module 30 immediately switches the backup power supply output, so that uninterrupted output is realized, stable work of the power supply system is ensured, and further, a power supply detection circuit is not required to be added on the main power supply, thereby greatly reducing the hardware cost and improving the speed of the backup power supply output.

In this embodiment, the first end of the seventh resistor R7 is connected to the second preset enable control terminal output_en2 and the 4 th pin of the first control chip U1, respectively, the second preset enable control terminal output_en2 is a control signal sent by the MCU of the system, and the boost module 10 is started through the second preset enable control terminal output_en2 while the power supply system is started. Note that, the first preset enable control terminal output_en1 and the second preset enable control terminal output_en2 may be the same or different, and may or may not be synchronous.

Optionally, in some possible embodiments, the boost module 10 further includes: a third diode D3;

the first end of the third diode D3 is connected to the second end of the inductor L, and the second end of the third diode D3 is connected to the first end of the fourth resistor R4 and the control output switch module 20, respectively.

In the present embodiment, the third diode D3 stably outputs the voltage of the backup power input terminal VCC1_bat to the control output switching module 20, prevents the voltage from being reversed, and maintains the freewheel voltage. Therefore, the backup power supply output voltage is sent to the control output switch circuit 20, and after the control output switch circuit 20 receives the backup power supply output voltage, the backup power supply output voltage is sent to the first input end of the comparison output module 30, and under the condition that the main power supply is effective, the power supply system does not work by adopting the backup power supply sent by the control output switch circuit 20, so that the power consumption of the backup power supply is reduced by about 0.1uA, and under the condition that the main power supply fails, the comparison output module 30 immediately switches the backup power supply output, so that uninterrupted output is realized, stable work of the power supply system is ensured, and further, a power supply detection circuit is not required to be added on the main power supply, thereby greatly reducing the hardware cost and improving the speed of the backup power supply output.

The application further provides a power supply system, which comprises a backup power supply system and a main power supply, wherein the specific structure of the backup power supply system refers to the above embodiment.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the scope of the claims, and all equivalent structural changes made in the present application and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the claims.

Claims

1. A backup power supply system, wherein the backup power supply system is connected between a backup power input and a power output, the backup power supply system comprising: the device comprises a boosting module, a control output switch module and a comparison output module;

2. The backup power supply system of claim 1, wherein the comparison output module comprises: a first diode and a second diode;

3. The backup power supply system of claim 2, wherein the control output switch module comprises: a switching circuit and a voltage conversion circuit;

4. A backup power supply system as claimed in claim 3, wherein the switching circuit comprises: a first transistor and a first resistor;

5. The backup power supply system of claim 4, wherein the voltage conversion circuit comprises: a second transistor, a second resistor, and a third resistor;

6. The backup power supply system of claim 5, wherein the boost module comprises: the first control chip, the inductor, the fourth resistor, the fifth resistor and the sixth resistor;

7. The backup power supply system of claim 6, wherein the boost module further comprises: a first capacitor and a second capacitor;

8. The backup power supply system of claim 7, wherein the boost module further comprises: a seventh resistor;

9. The backup power supply system of claim 8, wherein the boost module further comprises: a third diode;

10. A power supply system, characterized in that the power supply system comprises a backup power supply system according to any one of claims 1 to 9 and a main power supply.