CN203691031U

CN203691031U - Uninterrupted DC power supply

Info

Publication number: CN203691031U
Application number: CN201320891079.2U
Authority: CN
Inventors: 段建东; 叶兵; 张青山; 张宏光
Original assignee: Xian University of Technology
Current assignee: Xian University of Technology
Priority date: 2013-12-31
Filing date: 2013-12-31
Publication date: 2014-07-02
Anticipated expiration: 2023-12-31

Abstract

The utility model discloses an uninterrupted DC power supply. The uninterrupted DC power supply comprises a battery management unit, and the battery management unit is in electric signal connection with a lead-acid storage battery, an AC/DC unit, a DC output a, an LDO unit and a CPU separately. The AC/DC unit is in electric signal connection with an AC input unit, the CPU is in electric signal connection with the AC/DC unit, a storage unit, a communication unit and a DC output b separately, and the LDO unit is in electric signal connection with the DC output b. The uninterrupted DC power supply possesses two power supplies of a single-phase AC power supply and the lead-acid storage battery, and by a power supply management module, the seamless switching and effective protection of the two power supplies are realized. When an AC input is powered on and by the AC/DC conversion, on one hand, a load is supplied with power, and on the other hand, the lead-acid storage battery is charged intelligently. When the AC input is powered off, the lead-acid storage battery is switched into the power supply immediately, thereby realizing the uninterrupted 5V and 3A DC power supply. The CPU real-timely monitors the work state of a DC power supply, and stores and uploads the monitoring data via the communication with a superior monitor.

Description

A kind of uninterrupted DC power supply

Technical field

The utility model belongs to supply unit technical field, relates to a kind of uninterrupted DC power supply, especially a kind of uninterrupted DC power supply with intelligent management function and status monitoring function.

Background technology

DC power supply, in engineering and fields of measurement, has important practice, and the electronic equipment that it is measurement and monitoring provides work energy, and therefore, the uninterrupted DC power supply of high reliability has played irreplaceable effect to the normal work of supervisory control system.But the power supply of existing a lot of supervisory control systems exists potential safety hazard, common are that Alternating Current Power Supply and storage battery power supply switch life period gap, storage battery does not possess enough defencive functions in floating charge state, power supply itself for a long time.

Utility model content

The purpose of this utility model is to provide a kind of high-performance, uninterrupted DC power supply cheaply; the feature of this power supply is storage battery to discharge and recharge intelligent management, under-voltage protection, short-circuit protection; the storage of remote signalling, remote control and quantity of state to whole power work state, to solve dangerous, unreliable, uneconomic shortcoming of the prior art.

The utility model solves the technical scheme that its technical problem adopts: a kind of uninterrupted DC power supply, comprise battery management unit, battery management unit is connected with lead acid accumulator, AC/DC unit, direct current output a, LDO unit, the CPU element signal of telecommunication respectively, AC/DC unit is connected with the AC input cell signal of telecommunication, CPU element is connected with AC/DC unit, memory cell, communication unit, the direct current output b signal of telecommunication respectively, and LDO unit is connected with the direct current output b signal of telecommunication.

Feature of the present utility model is also,

Battery management unit wherein adopts discrete analogue device to build completely;

The chip that LDO unit wherein uses is MC78L05;

What AC/DC unit wherein used is Switching Power Supply;

The chip that CPU element is wherein used is MKE02Z64;

What memory cell was wherein used is SD card;

The communication mode that communication unit wherein uses is full duplex difference 485 buses.

The beneficial effects of the utility model are, the utility model adopts single phase alternating current (A.C.) voltage and lead acid accumulator to supply power with double circuit, adopt the CPU intelligent management mode of being combined with Power Management Unit, effectively raise reliability, the economy of DC power supply, seamless switching between two-way Switching power.

Brief description of the drawings

Fig. 1 is the theory structure block diagram of the uninterrupted DC power supply of the utility model;

Fig. 2 is the circuit theory diagrams of AC/DC unit in the uninterrupted DC power supply of the utility model;

Fig. 3 is the circuit theory diagrams of battery management unit in the uninterrupted DC power supply of the utility model;

Fig. 4 is the circuit theory diagrams of LDO unit in the uninterrupted DC power supply of the utility model.

In figure, 1. AC input cell, 2. direct current output a, 3. direct current output b, 4.AC/DC unit, 5. lead acid accumulator, 6. battery management unit, 7.LDO unit, 8.CPU unit, 9. communication unit, 10. memory cell.

Embodiment

Below in conjunction with specific embodiment, the utility model is described in further detail:

The utility model provides a kind of uninterrupted DC power supply, as shown in Figure 1, by AC input cell 1, direct current output a2, direct current output b3, AC/DC unit 4, lead acid accumulator 5, Power Management Unit 6, LDO unit 7, CPU element 8, communication unit 9, memory cell 10 forms, wherein battery management unit 6 respectively with lead acid accumulator 5, AC/DC unit 4, direct current output a2, LDO unit 7, CPU element 8 signals of telecommunication connect, AC input cell 1 is connected with AC/DC unit 4 signals of telecommunication, CPU element 8 respectively with AC/DC unit 4, memory cell 10, communication unit 9, the direct current output b3 signal of telecommunication connects, LDO unit 7, be connected with the direct current output b3 signal of telecommunication.

1, AC input cell

As shown in Figure 1, AC input cell 1 is the interface that AC energy is injected power supply, adopts strong insulation joint cross-talk, and the voltage range of input unit is AC85V～265V.

2, direct current output a

As shown in Figure 1, direct current output a2 is first group during the two-way direct current of uninterrupted power supply is exported, and the voltage of this output port output is DC14V1A, can expand to easily 12V, 9V, 5V, 3.3V electric pressure.

3, direct current output b

As shown in Figure 1, direct current output b3 is second group during the two-way direct current of uninterrupted power supply is exported, and the voltage of this output port output is DC5V3A, is the single-chip microcomputer power supply interface of standard.

4, lead acid accumulator

As shown in Figure 1, the lead acid accumulator 5 in the utility model is 12V5AH～12V8AH maintenance-free lead-acid storage batteries, and charging modes adopts constant-current constant-voltage charging mode, has cell activation function.

5, CPU element

As shown in Figure 1, CPU element 8 is taking MKE02Z64 as core, receive respectively AC dump remote signalling, undervoltage alarm remote signals, communicate by letter with higher controller by communication unit 9, upload monitor signal, and obtain instruction from higher level unit, judge whether to send cell activation control command and data in reading cells 10 whether, the power supply of CPU element 8 is provided by direct current output b3, and the object that designs CPU element is herein to be more prone to expansion for the later stage.

6, communication unit

As shown in Figure 1, communication unit 9 is connected with CPU element 8, is responsible for the two-way communication between CPU element 8 and higher controller.The full duplex difference 485 that communication unit 9 is made up of two SP3485 is communicated by letter, and has that antijamming capability is strong, the feature of stable performance.

7, memory cell

As shown in Figure 1, memory cell 10 is connected with CPU element 8, according to the instruction of CPU, Condition Monitoring Data is stored, for trouble hunting.Memory cell 10 is used SD card, is a kind of flash memory unit, and volume is little, and capacity is high.

8, AC/DC unit

As shown in Figure 2, AC/DC unit 4 is the inverse-excitation type switch power-supply as core based on TOP266EG taking what adopt, and its effect is to convert alternating voltage to direct voltage.The input of this power supply connects AC input cell, is added on the former limit of flyback transformer and the inner integrated MOSFET of U2 through rectifying and wave-filtering.When alternating voltage powers on, U2 starts starting of oscillation, and the conducting of the MOSFET of the VD signal controlling U2 inside feeding back and shutoff duty ratio, at MOSFET blocking interval, energy is delivered to secondary side by flyback transformer, obtains galvanic current and press after output rectification filter.The input voltage range of this unit is AC85V～265V, and output voltage is DC14V3A, and a part is for lead acid accumulator is powered, another part is directly load supplying.Added relay indicating light and AC dump remote signalling output signal at output, realized by U3, remote signals outputs to CPU.

9, Power Management Unit

As shown in Figure 3, Power Management Unit 6 is to be built by pure discrete analogue device, and 14V+, 14V-connect the output of AC/DC unit 4, and Vbat+, Vbat-connect respectively the input both positive and negative polarity of lead acid accumulator, and output Vpow+, Vpow-connect LDO unit, and the function of realization has:

The one, Alternating Current Power Supply and battery-driven seamless switching.In the time that interchange has electricity, the upper pipe conducting of D1 by exchanging powering load, judges whether charging according to battery both end voltage simultaneously; In the time of AC dump, the lower pipe conducting of Q2 and D1, is load supplying by storage battery, and handoff delay was only tens nanoseconds.

The 2nd, battery charging function.Formed by R1, R2, Q1, Q2, Q3, Q4, Q6, in the time that battery both end voltage is very low, according to Remote or on the spot " activation " instruction control Q1 cut-off of CPU, system charges a battery the mode with trickle charge, reaches activation effect; When cell voltage reaches certain value, Q1 conducting, system is charge in batteries by the mode taking constant current, improves charge efficiency; In the time that battery terminal voltage is higher, charging slowly reduces, until cut-off.

The 3rd, defencive function.Low pressure warning, is made up of U1, D4, R9, R10, Q5, and low pressure warning produces remote signals, delivers to CPU element 8; Under-voltage protection, is mainly made up of D5, D6, Q2, Q7, and battery terminal voltage is during lower than setting value, Q2 cut-off, and battery stops electric discharge; Defencive function, when battery two terminal shortcircuits are, can not burn Power Management Unit 6.

10, LDO unit

As shown in Figure 4, LDO unit 7 is made up of U2, C3, C4, and the output of battery management unit 6 connects the input 7 of LDO unit, through the change action of U2, the 5V3A direct current of stable output.

Claims

1. a uninterrupted DC power supply, it is characterized in that, comprise battery management unit (6), battery management unit (6) respectively with lead acid accumulator (5), AC/DC unit (4), direct current output a(2), LDO unit (7), CPU element (8) signal of telecommunication be connected, AC/DC unit (4) is connected with AC input cell (1) signal of telecommunication, CPU element (8) respectively with AC/DC unit (4), memory cell (10), communication unit (9), direct current output b(3) signal of telecommunication is connected, LDO unit (7) and direct current are exported b(3) signal of telecommunication is connected.

2. the uninterrupted DC power supply of one according to claim 1, is characterized in that, described battery management unit (6) adopts discrete analogue device to build formation.

3. the uninterrupted DC power supply of one according to claim 1, is characterized in that, the chip that described LDO unit (7) uses is MC78L05.

4. the uninterrupted DC power supply of one according to claim 1, is characterized in that, what described AC/DC unit (4) used is Switching Power Supply.

5. the uninterrupted DC power supply of one according to claim 1, is characterized in that, the chip that described CPU element (8) is used is MKE02Z64.

6. the uninterrupted DC power supply of one according to claim 1, is characterized in that, what described memory cell (10) was used is SD card.

7. the uninterrupted DC power supply of one according to claim 1, is characterized in that, the communication mode that described communication unit (9) uses is full duplex difference 485 buses.