CN-121984202-A - Standby power supply circuit with intelligent power supply switching and adaptive charging functions

Abstract

The invention discloses a standby power circuit with intelligent power switching and adaptive charging, which relates to the technical field of power circuits, and comprises a standby power unit, a power module, a boosting module, a charging module, a switching and blocking unit and an interface unit, the reverse current blocking and the multi-voltage conflict-free switching are realized through the diode with the specific model, the universal charging module is simply transformed to be suitable for the 8.4V battery, and each functional module is integrated by adopting an integrated wiring design. The invention effectively solves the technical defects of voltage conflict, reverse current, poor suitability, low integration level and the like of the conventional standby power supply circuit, remarkably improves the reliability, the universality and the maintainability of the circuit, has compact structure and controllable cost, can be widely applied to multiple fields of industrial control, communication equipment, intelligent home, portable electronics and the like, and has extremely high practical value and popularization prospect.

Inventors

• SUN YANQING
• ZHANG LIJUN
• SONG CHENLEI
• FENG WENQIANG
• WANG JUN
• JIANG FENG

Assignees

• 大庆高新区中环电力控制系统有限公司

Dates

Publication Date

20260505

Application Date

20251226

Claims (10)

1. 1. The standby power supply circuit with intelligent power supply switching and adaptive charging is characterized by comprising a standby power supply unit, a power supply module U1, a boosting module U2, a charging module U3, a switching and blocking unit and an interface unit; The standby power supply unit is respectively electrically connected with the power supply module U1, the boosting module U2 and the charging module U3 to provide electric energy input for each module, the power supply module U1 and the boosting module U2 are electrically connected with the switching and blocking unit, and the switching and blocking unit and the charging module U3 are electrically connected with the interface unit to form a complete power supply and charging loop.
2. 2. A standby power circuit with intelligent power switching and adaptive charging according to claim 1, wherein the standby power unit comprises a battery BT1 and an interface P1 for storing electrical energy and providing standby power.
3. 3. The standby power circuit with intelligent power switching and adaptive charging according to claim 1, wherein the power module U1 is a DC-DC step-down module, and an input end of the power module U1 is electrically connected to a pin corresponding to the interface P1 of the standby power unit.
4. 4. The stand-by power supply circuit with intelligent power supply switching and adaptive charging according to claim 1, wherein the boost module U2 is a DC-DC boost module, and an input end of the boost module is electrically connected to a pin corresponding to the interface P1 of the stand-by power supply unit.
5. 5. The standby power circuit with intelligent power supply switching and adaptive charging according to claim 1, wherein the charging module U3 is matched with the battery BT1 of the standby power unit, and the output end of the charging module U3 is electrically connected with a pin corresponding to the interface P1, so as to provide an adaptive charging current and voltage for the battery BT 1.
6. 6. The standby power circuit with intelligent power supply switching and adaptive charging according to claim 1, wherein the switching and blocking unit comprises a diode D1 and a diode D2, the diodes D1 and D2 are all SS34 schottky diodes, an anode of the diode D2 is electrically connected with an output end of the boost module U2, a cathode of the diode D2 is electrically connected with the interface unit, and reverse current is blocked through diode single-phase conductivity, so that multi-voltage conflict-free switching is realized.
7. 7. The standby power circuit with intelligent power supply switching and adaptive charging according to claim 1, wherein the interface unit comprises an interface P2, a MAIN interface and protection elements CB1 and CB3, and the protection elements CB1 and CB3 are self-recovery fuses respectively connected in series between the power module U1 and the switching and blocking unit, and between the boost module U2 and the switching and blocking unit.
8. 8. The backup power supply circuit with intelligent power supply switching and adaptive charging according to claim 7, wherein rated currents of the protection elements CB1, CB3 are 3A and an operation temperature is 85 ℃.
9. 9. The standby power circuit with intelligent power supply switching and adaptive charging according to claim 1, comprising a filtering unit, wherein the filtering unit is composed of capacitors C1 and C2, the capacitor C1 is connected in parallel between the output end of the power supply module U1 and the ground, and the capacitor C2 is connected in parallel between the output end of the boost module U2 and the ground.
10. 10. The standby power circuit with intelligent power switching and adaptive charging according to claim 1, wherein each functional module of the circuit is integrated on the same printed circuit board, and the printed circuit board is made of FR-4 material.

Description

Standby power supply circuit with intelligent power supply switching and adaptive charging functions Technical Field The invention relates to the technical field of power supply circuits, in particular to a standby power supply circuit with intelligent power supply switching and adaptive charging, which is suitable for various electronic equipment needing standby power supply guarantee. Background At the moment of the high-speed development of modern electronic technology, electronic equipment is deeply integrated into various fields of industrial production, daily life, communication transmission and the like, and the running continuity and reliability of the electronic equipment are directly related to production efficiency, life convenience and life and property safety. The standby power supply circuit is used as an emergency guarantee system of the electronic equipment, plays a key role of continuously providing electric energy for the core components of the equipment when the main power supply fails, is powered off or is unstable in power supply, and is one of the core links for guaranteeing uninterrupted operation of the electronic equipment. Along with the increasing complexity of the functions of electronic equipment, the performance requirements on a standby power supply circuit are continuously improved, on one hand, the power supply voltage requirements of different parts in the equipment are diversified, for example, part of chips need 12V voltage for power supply, and sensors, actuators and the like may need 11V voltage, so that the standby power supply circuit can provide various stable voltage outputs, on the other hand, the standby battery types and voltage levels of different equipment are different, a charging module is required to have good suitability, the charging efficiency is prevented from being low or the battery is prevented from being damaged due to insufficient suitability, in addition, the development trend of miniaturization and integration of the equipment is also provided with higher requirements on the integration level and wiring rationality of the standby power supply circuit, so that the occupied space of the circuit is reduced, and the fault occurrence rate is reduced. Although the standby power supply circuit is widely applied, the existing products and technical schemes in the current market still have a plurality of outstanding defects, and the operation stability, the use cost and the maintenance efficiency of the electronic equipment are seriously affected, specifically as follows: In the existing standby power supply circuit, the switching logic between the standby power supply and the main power supply or between the standby power supply and different voltage output modules is generally simpler, and a direct change-over switch, a relay switch or a parallel output mode without special blocking design is adopted. The design has the obvious defects that when different voltage modules work or switch at the same time, voltage superposition conflicts are extremely easy to generate due to the difference of output voltages of the modules, instantaneous high-voltage impact is formed, sensitive elements of load equipment can be damaged, meanwhile, the current of the high-voltage modules can reversely flow into the low-voltage modules due to the lack of an effective reverse current blocking mechanism, the modules heat, the efficiency is reduced, even the power supply modules are burnt, and the reliability and the service life of a circuit are seriously influenced. For example, in a backup power supply circuit of an industrial control device, a 12V power supply module and an 11V power supply module are directly connected in parallel to a load, and an inverting current blocking element is not provided. In actual use, when the 12V module is started firstly and then the 11V module is started, the current of the 12V module reversely flows into the 11V module, so that the breakdown of a power tube in the 11V module is caused, the module is damaged, equipment is stopped due to instantaneous short circuit, and economic loss is caused for industrial production. In the prior art, the matching between the charging module and the standby battery is poor, and the universal charging module is difficult to meet the charging requirements of batteries with different voltage grades and different capacities. In many cases, manufacturers need to customize a dedicated charging circuit or purchase a dedicated charging module according to parameters such as the voltage of a specific battery (e.g., an 8.4V lithium battery), the charging current, etc. The customization mode has two major problems of high customization cost, long research and development and production period of the special charging module and much higher purchase price than the general module, and poor generality, when the battery model or the voltage level is replaced by the equipment, the original charging module cannot be used co