Direct-current battery power supply circuit with improved reliability

Abstract

The utility model discloses a direct-current battery power supply circuit with improved reliability. The direct-current battery power supply circuit comprises a direct-current charging unit and a voltage transformation and rectification unit, wherein the direct-current charging unit is electrically connected with an alternating-current power supply, the direct-current charging unit is electrically connected with the battery pack, and the battery pack is electrically connected with a load; the transformation rectification unit is electrically connected with the AC power supply and the power supply end of the load, and the battery pack is a standby power supply. The voltage transformation and rectification unit transforms and rectifies the AC voltage into DC voltage and outputs the DC voltage, and supplies the DC voltage to a load for use, so that normal work of the load is realized; the voltage bearing capacity of the transformation and rectification unit is far higher than that of a charger manufactured by a common switching power supply, so that the reliability of the power supply circuit can be remarkably improved by introducing the transformation and rectification unit under complex conditions; moreover, the direct current charging unit does not need to directly supply power to the load under the normal condition, so that the charging voltage of the battery pack can be controlled at a lower level, and the actual service life of the battery pack is effectively prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of DC power supply technology, specifically relating to a DC battery power supply circuit with improved reliability. Background Technology

[0002] During the operation of electrical appliances, the AC power supplied by the mains is often converted into DC power by a charger made using a switching power supply before supplying power to the appliances. In order to prevent the appliances from losing power in case of power failures such as AC power outages, the DC power converted by the charger is also used to charge a battery pack, so that the appliances can still be powered by the battery pack in the event of a power outage, ensuring the normal operation of the appliances.

[0003] However, while the existing power outage response solutions for this type of power supply circuit seem practical, they have many problems in actual operation. First, when the AC power supply from the mains is abnormal, the battery pack provides DC power to the appliances. However, in actual use, abnormal AC power supply is not limited to power outages, but includes various situations such as overvoltage, undervoltage, lightning strikes, and surges. Chargers made using switching power supplies are unable to cope with these complex situations, and therefore often fail, leading to battery depletion and appliance shutdown. Second, because the charger needs to support the operation of the appliances for a long time, its output voltage is generally high. The battery pack being charged will also be operating under high voltage for a long time, which greatly shortens the actual lifespan of the battery pack.

[0004] Therefore, there is an urgent need to provide a DC battery power supply circuit that can significantly improve the reliability of the power supply circuit and effectively extend the actual service life of the battery pack. Utility Model Content

[0005] The purpose of this invention is to provide a DC battery power supply circuit with improved reliability to solve the aforementioned problems in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This utility model provides a DC battery power supply circuit with improved reliability, characterized in that,

[0008] Includes: DC charging unit and transformer-rectifier unit;

[0009] The AC voltage power supply terminal of the DC charging unit is electrically connected to an AC power source, the output terminal of the DC charging unit is electrically connected to a battery pack, and the battery pack is electrically connected to a load.

[0010] The AC voltage power supply terminal of the transformer-rectifier unit is electrically connected to an AC power source, and the DC output terminal of the transformer-rectifier unit is electrically connected to the power supply terminal of the load, and the battery pack is a backup power source.

[0011] In one possible design, the DC charging unit includes a DC charger;

[0012] The DC charger serves as the AC voltage power supply terminal of the DC charging unit, which is electrically connected to the AC power source. The DC output terminal of the DC charger is electrically connected to the power supply terminal of the battery pack, and the battery pack is electrically connected to the power supply terminal of the load.

[0013] In one possible design, the DC charging unit further includes a diode;

[0014] The diode is electrically connected between the DC output terminal of the DC charger and the power supply terminal of the load.

[0015] In one possible design, the transformer-rectifier unit includes a transformer subunit and a rectifier subunit;

[0016] The input terminal of the transformer subunit is electrically connected to the AC power supply as the AC voltage power supply terminal of the transformer-rectifier unit, the output terminal of the transformer subunit is electrically connected to the input terminal of the rectifier subunit, and the output terminal of the rectifier subunit is electrically connected to the power supply terminal of the load as the DC output terminal of the transformer-rectifier unit.

[0017] In one possible design, the transformer subunit is a power frequency transformer, and the rectifier subunit is a rectifier.

[0018] In one possible design, the rectifier includes a rectifier circuit, a filter circuit, and a voltage regulator circuit.

[0019] Beneficial Effects: This utility model provides a DC battery power supply circuit with improved reliability, including a DC charging unit and a transformer-rectifier unit. The AC voltage supply terminal of the DC charging unit is electrically connected to an AC power source, and the output terminal of the DC charging unit is electrically connected to a battery pack, which is electrically connected to a load. The AC voltage supply terminal of the transformer-rectifier unit is electrically connected to an AC power source, and the DC output terminal of the transformer-rectifier unit is electrically connected to the power supply terminal of the load. The battery pack serves as a backup power source. The transformer-rectifier unit transforms and rectifies the AC voltage received from the AC power source into a DC voltage output, and supplies the processed DC voltage to the load for normal operation. Because the voltage withstand capability of the transformer-rectifier unit is much higher than that of a charger made from a common switching power supply, its introduction significantly improves the stability and reliability of the power supply circuit when facing complex situations such as overvoltage, undervoltage, lightning strikes, and surges. Furthermore, since the DC charging unit does not need to directly supply power to the load under normal circumstances, the charging voltage of the battery pack can be controlled at a lower level, effectively improving the actual service life of the battery pack. Attached Figure Description

[0020] Figure 1 This is a functional block diagram of the DC battery power supply circuit for improving reliability in Embodiment 1 of this utility model;

[0021] Figure 2 This is a functional block diagram of the DC battery power supply circuit for improving reliability in Embodiment 2 of this utility model. Detailed Implementation

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the present utility model will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is used to help understand this utility model, but does not constitute a limitation on this utility model.

[0023] It should be understood that although the terms first, second, etc., may be used herein to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another. For example, the first unit may be referred to as the second unit, and similarly, the second unit may be referred to as the first unit, without departing from the scope of the exemplary embodiments of this utility model.

[0024] It should be understood that the term "and / or" that may appear in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist simultaneously. The term " / and" that may appear in this document describes another relationship between related objects, indicating that two relationships can exist. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " that may appear in this document generally indicates that the related objects before and after it are in an "or" relationship.

[0025] Example 1:

[0026] like Figure 1 As shown, this embodiment provides a DC battery power supply circuit with improved reliability, including: a DC charging unit and a transformer-rectifier unit;

[0027] The AC voltage power supply terminal of the DC charging unit is electrically connected to the AC power source, the output terminal of the DC charging unit is electrically connected to the battery pack, and the battery pack is electrically connected to the load.

[0028] The AC voltage power supply terminal of the transformer and rectifier unit is electrically connected to the AC power source, while the DC output terminal of the transformer and rectifier unit is electrically connected to the power supply terminal of the load, and the battery pack serves as a backup power source.

[0029] It should be noted that the DC charging unit here actually adopts the design of an existing power supply circuit, but its function is completely different from that of the existing power supply circuit. First, the function of the DC charging unit is to receive the AC voltage from the AC power supply and convert it into DC voltage output. Second, during normal power supply, the DC charging unit does not participate in the power supply of the load in the power supply circuit provided in this embodiment, but forms a simple and independent internal charging loop with the battery pack (charging the battery pack). Therefore, the function of the DC charging unit changes from the main power supply function in the existing power supply circuit to the backup power supply function. This allows its charging voltage for the battery pack to be controlled at a lower level. Compared with the existing power supply circuit, the DC charging unit here does not need to directly provide voltage to the load. Therefore, it only needs to be designed to adapt to the DC voltage output required for battery pack charging. The battery pack maintains a smaller voltage input, which effectively improves the actual service life of the battery pack.

[0030] The transformer-rectifier unit here combines transformer and rectification functions. Under normal operation, it transforms and rectifies the AC voltage received from the AC power source into DC voltage and outputs it to the load. In other words, the transformer-rectifier unit realizes the main power supply function of the power supply circuit provided in this embodiment. Not only can it provide normal power supply, but it also does not participate in power supply when the AC power source is disconnected, ensuring the normal support of the DC charging module for the load. Furthermore, because its voltage withstand capability is much higher than that of chargers made from ordinary switching power supplies, it can exhibit better voltage resistance and regulation capabilities than existing power supply circuits when facing complex situations such as overvoltage, undervoltage, lightning strikes, and surges. This significantly improves the stability and reliability of the power supply circuit, ensuring that it will not be damaged even under such complex situations and will not affect the battery pack's power supply to the load.

[0031] Example 2:

[0032] like Figure 2 As shown, this embodiment provides a DC battery power supply circuit with improved reliability. In one possible implementation, the DC charging unit includes a DC charger.

[0033] The DC charger, as the AC voltage power supply terminal of the DC charging unit, is electrically connected to the AC power source. The DC output terminal of the DC charger is electrically connected to the power supply terminal of the battery pack, and the battery pack is electrically connected to the power supply terminal of the load.

[0034] When the AC power supply is working normally, the DC charger and the battery pack will form an independent charging circuit. The DC charger will convert the AC voltage of the AC power supply and output the DC voltage according to the set DC output voltage to charge the battery pack, without supplying power to the load.

[0035] When the AC power supply fails, the DC charger stops working, and the transformer and rectifier unit also stops supplying power to the load. At this time, the power supply circuit changes to the battery pack actively supplying power to the load, with the battery pack serving as a backup power source.

[0036] When the AC power supply experiences complex situations such as overvoltage, undervoltage, lightning strikes, or surges, the DC charger may be damaged. In this case, since the DC charging unit is an independent charging circuit, the DC charger can be replaced directly by simply disconnecting the connection between the DC charger and the battery pack. This process is not only simple and safe, but also does not require disconnecting the normal power supply to the load and does not affect the normal operation of the load.

[0037] In one possible implementation, the DC charging unit further includes a diode;

[0038] The diode is electrically connected between the DC output terminal of the DC charger and the power supply terminal of the load.

[0039] This diode is in the off state during normal charging, so no current flows through it, ensuring that the DC charging unit does not supply power to the load. When the AC power is off, the diode is turned on, allowing the battery pack to provide DC voltage to the load for normal operation.

[0040] In one possible implementation, the transformer-rectifier unit includes a transformer subunit and a rectifier subunit;

[0041] The input terminal of the transformer subunit is electrically connected to the AC power supply as the AC voltage power supply terminal of the transformer-rectifier unit, the output terminal of the transformer subunit is electrically connected to the input terminal of the rectifier subunit, and the output terminal of the rectifier subunit is electrically connected to the power supply terminal of the load as the DC output terminal of the transformer-rectifier unit.

[0042] The transformer subunit is used to transform the AC voltage output from the AC power supply according to the load requirements. When facing complex situations such as overvoltage, undervoltage, lightning strikes, and surges, its instantaneous voltage withstand capability is much stronger than that of a charger with a switching power supply structure. Therefore, it greatly improves its stability and reliability. Even if the DC charger is damaged at this time, it will not affect the transformer and rectifier unit to continue to supply power to the load. The rectifier subunit rectifies the AC power that has been transformed into DC power and outputs it to the power supply terminal of the load to complete the power supply.

[0043] In one possible implementation, the transformer subunit is a power frequency transformer, and the rectifier subunit is a rectifier.

[0044] The reason for choosing a power frequency transformer is that it generally has a more reliable high voltage resistance capability, and therefore has better stability when dealing with complex situations such as overvoltage, undervoltage, lightning strikes, and surges. The reason for choosing a rectifier is that when facing various situations, the rectifier not only needs to perform simple DC rectification, but also needs to take into account other functions such as voltage stabilization and filtering.

[0045] In one possible implementation, the rectifier includes a rectifier circuit, a filter circuit, and a voltage regulator circuit.

[0046] When dealing with complex situations such as overvoltage, undervoltage, lightning strikes, and surges, not only is the transformer subunit required to withstand voltage, but it is also necessary to perform current filtering and voltage regulation when supplying power to the load, so as to ensure that the load can operate at normal power without being affected.

[0047] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A DC battery power supply circuit with improved reliability, characterized in that, include: DC charging unit and transformer-rectifier unit; The AC voltage power supply terminal of the DC charging unit is electrically connected to an AC power source, the output terminal of the DC charging unit is electrically connected to a battery pack, and the battery pack is electrically connected to a load. The AC voltage power supply terminal of the transformer-rectifier unit is electrically connected to an AC power source, and the DC output terminal of the transformer-rectifier unit is electrically connected to the power supply terminal of the load, and the battery pack is a backup power source.

2. The DC battery power supply circuit for improving reliability according to claim 1, characterized in that, The DC charging unit includes a DC charger; The DC charger serves as the AC voltage power supply terminal of the DC charging unit, which is electrically connected to the AC power source. The DC output terminal of the DC charger is electrically connected to the power supply terminal of the battery pack, and the battery pack is electrically connected to the power supply terminal of the load.

3. The DC battery power supply circuit for improving reliability according to claim 2, characterized in that, The DC charging unit also includes a diode; The diode is electrically connected between the DC output terminal of the DC charger and the power supply terminal of the load.

4. The DC battery power supply circuit for improving reliability according to claim 1, characterized in that, The transformer-rectifier unit includes a transformer subunit and a rectifier subunit; The input terminal of the transformer subunit is electrically connected to the AC power supply as the AC voltage power supply terminal of the transformer-rectifier unit, the output terminal of the transformer subunit is electrically connected to the input terminal of the rectifier subunit, and the output terminal of the rectifier subunit is electrically connected to the power supply terminal of the load as the DC output terminal of the transformer-rectifier unit.

5. The DC battery power supply circuit with improved reliability according to claim 4, characterized in that, The transformer subunit is a power frequency transformer, and the rectifier subunit is a rectifier.

6. The DC battery power supply circuit for improving reliability according to claim 5, characterized in that, The rectifier includes a rectifier circuit, a filter circuit, and a voltage regulator circuit.

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