Standby power supply switching structure of power supply system

Abstract

The utility model relates to the technical field of power supply systems, in particular to a standby power supply switching structure of a power supply system, which comprises a main power supply, a standby power supply, a switching processing unit and a system unit, and is characterized in that the main power supply and the standby power supply are electrically connected with the switching processing unit, and the switching processing unit is electrically connected with the system unit; the main power supply, the standby power supply, the switching processing unit and the system unit are connected to form a closed circuit, a first control switch is arranged between the output end of the main power supply and the circuit, a second control switch is arranged between the output end of the standby power supply and the circuit, the output end of the main power supply is further connected with a comparator, and a voltage reference signal is preset in the comparator. When the voltage of the main power supply flowing into the comparator is smaller than the reference signal, the comparator outputs a control signal to control the second control switch to connect the standby power supply into the circuit. The technical problem of system instability caused by insufficient energy of the main power supply in the prior art is effectively solved.

Description

Technical Field

[0001] This application relates to the technical field of power supply systems, and particularly to a backup power supply switching structure for a power supply system. Background Art

[0002] In recent years, the number of mobile devices has gradually increased, and they appear in various forms in industrial products and products in special industries. With the increasing demand for energy in products, the requirements for product systems are getting higher and higher. As a result, on the basis of the main power supply system of products, the need to add a backup power supply is more urgent, and it is required that when switching between the main and backup power supply systems, the stability of the system is not affected to meet the functional requirements during emergency handling. Utility Model Content

[0003] This application provides a backup power supply switching structure for a power supply system to at least solve the technical problem of system instability caused by insufficient energy of the main power supply in the prior art.

[0004] To achieve the above object, this application provides a backup power supply switching structure for a power supply system, including a main power supply, a backup power supply, a switching processing unit, and a system unit. The main power supply and the backup power supply are respectively electrically connected to the switching processing unit, the switching processing unit is electrically connected to the system unit, and the main power supply, the backup power supply, the switching processing unit, and the system unit are connected to form a closed circuit. A first control switch is provided between the output terminal of the main power supply and the circuit, and a second control switch is provided between the output terminal of the backup power supply and the circuit. The output terminal of the main power supply is also connected to a comparator, and a voltage reference signal is preset in the comparator. When the voltage flowing from the main power supply into the comparator is less than the reference signal, the comparator outputs a control signal to control the second control switch to connect the backup power supply into the circuit.

[0005] In some embodiments, the switching processing unit includes a first rectification group and a second rectification group that are electrically connected in parallel. The first rectification group includes a first rectifier diode and a second rectifier diode that are electrically connected in series, and the second rectification group includes a third rectifier diode and a fourth rectifier diode that are electrically connected in series.

[0006] In some embodiments, the main power supply is connected between the first rectifier diode and the second rectifier diode, and the backup power supply is connected between the third rectifier diode and the fourth rectifier diode.

[0007] In some embodiments, a charging interface is connected to the current input terminal of the switching processing unit, and a discharging interface is connected to the current output terminal of the switching processing unit.

[0008] In some of these embodiments, the main power supply and the backup power supply are respectively electrically connected to the charging interface, enabling the charging interface to charge the main power supply and the backup power supply.

[0009] In some of these embodiments, the first rectifier diode is disposed at one end close to the charging interface, the second rectifier diode is disposed at one end close to the discharging interface, and the positive electrode of the second rectifier diode is connected to the negative electrode of the first rectifier diode; the third rectifier diode is disposed at one end close to the charging interface, the fourth rectifier diode is disposed at one end close to the discharging interface, and the positive electrode of the fourth rectifier diode is connected to the negative electrode of the third rectifier diode.

[0010] In some of these embodiments, the positive electrode of the main power supply is connected between the first rectifier diode and the second rectifier diode through the first control switch; the positive electrode of the backup power supply is connected between the third rectifier diode and the fourth rectifier diode through the second control switch.

[0011] In some of these embodiments, the main power supply and the backup power supply are battery modules composed of at least one battery.

[0012] In some of these embodiments, the battery is a lithium iron phosphate battery, a ternary lithium battery, or a polymer battery.

[0013] In some of these embodiments, the voltage of the battery is 3 - 4.2V.

[0014] According to the above content, the beneficial effect of the present application is that: the output voltage of the main power supply is monitored in real time through a comparator, and when the output voltage of the main power supply is lower than a preset reference value, the backup power supply is started by the control signal sent by the comparator. Since the main power supply has not been completely turned off when the backup power supply is started, the working state of the system will not fluctuate due to the opening of the backup power supply at this time, and the battery life is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation to the present application. In the drawings:

[0016] Figure 1 is the control logic circuit diagram of the switching processing unit in the embodiment of the present application;

[0017] Figure 2 is the charge and discharge logic circuit diagram of the power supply system in the embodiment of the present application.

[0018] Description of reference numerals: comparator 1; reference signal 2; control signal 3; charging interface Power_in; discharging interface Power_out; capacitor C; electrical appliance RL; ground wire GND; main power supply V1; backup power supply V2; first control switch S1; second control switch S2; first rectifying diode D1; second rectifying diode D2; third rectifying diode D3; fourth rectifying diode D4. Detailed implementation manners

[0019] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be described and explained below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments provided in the present application without making creative efforts belong to the scope of protection of the present application. In addition, it can also be understood that although the efforts made in this development process may be complex and lengthy, for those of ordinary skill in the art related to the content disclosed in the present application, some design, manufacturing or production changes made on the basis of the technical content disclosed in the present application are only conventional technical means and should not be understood as insufficient disclosure of the content of the present application.

[0020] Reference to "embodiment" in the present application means that a specific feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those of ordinary skill in the art explicitly and implicitly understand that the embodiments described in the present application can be combined with other embodiments without conflict.

[0021] Unless otherwise defined, the technical terms or scientific terms involved in this application shall have the ordinary meanings understood by those with ordinary skills in the technical field to which this application belongs. The words such as "a", "an", "one", "the" and the like involved in this application do not indicate a limitation in quantity and may represent a singular or plural number. The terms "comprise", "include", "have" and any variations thereof involved in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may further include unlisted steps or units, or may further include other steps or units inherent to these processes, methods, products or devices. The similar words such as "connect", "be connected", "couple" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "plurality" involved in this application means greater than or equal to two. "And / or" describes the association relationship of associated objects and indicates that three relationships may exist. For example, "A and / or B" may represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. The terms "first", "second", "third" and the like involved in this application are only used to distinguish similar objects and do not represent a specific order of the objects.

[0022] As shown in the embodiments Figures 1-2 In the figure, Power_in is the charging interface of the system, Power_out is the discharging interface of the system, C is the capacitor, RL is the electrical appliance connected to the system, and GND is the ground wire.

[0023] The embodiment of the present application provides a backup power supply switching structure for a power supply system, including a main power supply V1, a backup power supply V2, a switching processing unit and a system unit. The main power supply V1 and the backup power supply V2 are respectively electrically connected to the switching processing unit, the switching processing unit is electrically connected to the system unit, and the main power supply V1, the backup power supply V2, the switching processing unit and the system unit are connected to form a closed circuit.

[0024] Among them, the system unit is based on chips of different application scenarios of the MCU type (micro control unit, single-chip microcomputer or single-chip microcontroller) and the CPU type (central processing unit, as the operation and control core of a computer system and the final execution unit for information processing and program operation), and controls and interacts with external devices through the application interfaces of the main control devices.

[0025] Further, a first control switch S1 is provided between the output terminal of the main power supply V1 and the circuit. When the first control switch S1 is turned off, the connection between the main power supply V1 and the circuit is disconnected. When the first control switch S1 is turned on, the main power supply V1 is connected to the circuit. The first control switch S1 is normally closed under normal conditions, so that the main power supply V1 is connected to the circuit. A second control switch S2 is provided between the output terminal of the standby power supply V2 and the circuit. When the second control switch S2 is turned off, the connection between the standby power supply V2 and the circuit is disconnected. When the second control switch S2 is turned on, the standby power supply V2 is connected to the circuit. The second control switch S2 is normally open under normal conditions, so that the standby power supply V2 is disconnected from the circuit. The output terminal of the main power supply V1 is also connected to a comparator 1, and the comparator 1 is preset with a stable voltage reference signal 2. When the voltage of the main power supply V1 is sufficient for the electrical appliances of the subsequent system to operate stably, the analog signal of the output voltage of the main power supply V1 collected at the input terminal of the comparator 1 is greater than the reference signal 2. At this time, the comparator 1 does not output a control signal 3. When the voltage of the main power supply V1 is not sufficient for the electrical appliances of the subsequent system to operate stably, the analog signal of the output voltage of the main power supply V1 collected at the input is less than the reference signal 2. At this time, the comparator 1 outputs a control signal 3, and the second control switch S2 is controlled to close through the control signal 3, thereby connecting the standby power supply V2 to the circuit. Since the output of the main power supply V1 has not been completely turned off while the standby power supply V2 is connected to the circuit, the operating state of the circuit system will not fluctuate due to the power supply switchover.

[0026] Further, the switching processing unit includes a first rectification group and a second rectification group that are electrically connected and in parallel. The first rectification group includes a first rectifier diode D1 and a second rectifier diode D2 that are electrically connected and in series. The second rectification group includes a third rectifier diode D3 and a fourth rectifier diode D4 that are electrically connected and in series. The positive pole of the main power supply V1 is connected between the first rectifier diode D1 and the second rectifier diode D2 through the first control switch S1. The positive pole of the standby power supply V2 is connected between the third rectifier diode D3 and the fourth rectifier diode D4 through the second control switch S2.

[0027] Further, a charging interface Power_in is connected to the current input terminal of the switching processing unit, and a discharging interface Power_out is connected to the current output terminal of the switching processing unit. The first rectifier diode D1 is arranged at one end close to the charging interface, and the second rectifier diode D2 is arranged at one end close to the discharging interface. The positive pole of the second rectifier diode D2 is connected to the negative pole of the first rectifier diode D1. The third rectifier diode D3 is arranged at one end close to the charging interface, and the fourth rectifier diode D4 is arranged at one end close to the discharging interface. The positive pole of the fourth rectifier diode D4 is connected to the negative pole of the third rectifier diode D3. Thus, the main power supply V1 and the standby power supply V2 are respectively electrically connected to the charging interface, so that the charging interface can charge the main power supply V1 and the standby power supply V2.

[0028] Specifically, when the main power supply V1 needs to supply power to the electrical appliance RL of the subsequent stage system, the current direction of the main power supply V1 is from the positive pole of the main power supply V1 through the second rectifier diode D2 and then to the output terminal of the discharge interface Power_out. Due to the unidirectional conduction characteristic of the rectifier diode, the current of the main power supply V1 cannot flow through the first rectifier diode D1 to the charging interface Power_in during discharge, and also cannot flow from the common point of the second rectifier diode D2 and the fourth rectifier diode D4 through the fourth rectifier diode D4 to reach the backup power supply V2. When the backup power supply V2 needs to supply power to the electrical appliance RL of the subsequent stage system, the current direction of the backup power supply V2 is from the positive pole of the backup power supply V2 through the fourth rectifier diode D4 and then to the output terminal of the discharge interface Power_out. Due to the unidirectional conduction characteristic of the rectifier diode, the current of the backup power supply V2 cannot flow through the third rectifier diode D3 to the charging interface Power_in during discharge, and also cannot flow from the common point of the fourth rectifier diode D4 and the second rectifier diode D2 through the second rectifier diode D2 to reach the main power supply V1.

[0029] During charging, the current reaches the main power supply V1 and the backup power supply V2 respectively through the first rectifier diode D1 and the third rectifier diode D3 at the common node of the charging interface Power_in. Due to the unidirectional conduction of the rectifier diode, the current in the main power supply V1 and the backup power supply V2 will not flow back through the first rectifier diode D1 and the third rectifier diode D3.

[0030] Furthermore, the main power supply V1 and the backup power supply V2 are battery modules composed of at least one battery, and the battery can be a lithium iron phosphate battery, a ternary lithium battery, a polymer battery, etc.

[0031] Specifically, the voltage of a single battery is 3 - 4.2V, and the batteries are connected in series with each other. Finally, the voltage output by the power supply to the outside is N*(3 - 4.2)V, where N is the number of battery cells connected in series in the battery pack.

[0032] Those skilled in the art should understand that the technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0033] The above-described embodiments merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A backup power supply switching structure of a power supply system, comprising a main power supply, a backup power supply, a switching processing unit and a system unit, wherein the main power supply and the backup power supply are electrically connected to the switching processing unit respectively, and the switching processing unit is electrically connected to the system unit, and the main power supply, the backup power supply, the switching processing unit and the system unit are connected to form a closed circuit, characterized in that: A first control switch is arranged between the output end of the main power supply and the circuit, and a second control switch is arranged between the output end of the backup power supply and the circuit. The output end of the main power supply is also connected to a comparator, and the comparator is preset with a voltage reference signal. When the voltage of the main power supply flowing into the comparator is less than the reference signal, the comparator outputs a control signal to control the second control switch to connect the backup power supply to the circuit.

2. The backup power supply switching structure of a power supply system according to claim 1, characterized in that: The switching processing unit includes a first rectifier group and a second rectifier group electrically connected in parallel, the first rectifier group includes a first rectifier diode and a second rectifier diode electrically connected in series, and the second rectifier group includes a third rectifier diode and a fourth rectifier diode electrically connected in series.

3. The backup power supply switching structure of a power supply system according to claim 2, characterized in that: The main power supply is connected between the first rectifier diode and the second rectifier diode, and the backup power supply is connected between the third rectifier diode and the fourth rectifier diode.

4. The backup power supply switching structure of a power supply system according to claim 3, characterized in that: The current input end of the switching processing unit is connected to a charging interface, and the current output end of the switching processing unit is connected to a discharging interface.

5. The backup power supply switching structure of a power supply system according to claim 4, characterized in that: The main power supply and the backup power supply are electrically connected to the charging interface respectively, so that the charging interface can charge the main power supply and the backup power supply.

6. The backup power supply switching structure of a power supply system according to claim 4, characterized in that: The first rectifier diode is arranged at one end close to the charging interface, the second rectifier diode is arranged at one end close to the discharging interface, and the anode of the second rectifier diode is connected to the cathode of the first rectifier diode; the third rectifier diode is arranged at one end close to the charging interface, the fourth rectifier diode is arranged at one end close to the discharging interface, and the anode of the fourth rectifier diode is connected to the cathode of the third rectifier diode.

7. The backup power supply switching structure of a power supply system according to claim 6, characterized in that: The positive electrode of the main power supply is connected between the first rectifier diode and the second rectifier diode through the first control switch; the positive electrode of the backup power supply is connected between the third rectifier diode and the fourth rectifier diode through the second control switch.

8. A backup power supply switching structure of a power supply system according to any one of claims 1 to 7, characterized in that: The main power supply and the backup power supply are battery modules composed of at least one battery.

9. The backup power supply switching structure of a power supply system according to claim 8, characterized in that: The battery is a lithium iron phosphate battery, a ternary lithium battery or a polymer battery.

10. The backup power supply switching structure of a power supply system according to claim 8, characterized in that: The voltage of the battery is 3-4.2V.

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