CN2482258Y

CN2482258Y - Uninterrupted power supply unit for computer

Info

Publication number: CN2482258Y
Application number: CN 00255193
Authority: CN
Inventors: 王兴全
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-11-17
Filing date: 2000-11-17
Publication date: 2002-03-13
Anticipated expiration: 2010-11-17

Abstract

The utility model relates to an uninterruptible power supply device for a computer. The uninterruptible power device consists of a charging circuit, a constant-voltage control reactive circuit, and an output waveform shaping circuit, and comprises a transformer, a full bridge rectifier, a central process unit, a voltage regulator, and a circuit connected by a resistor and a capacitance section. The uninterruptible power device has the advantages that the component part is few, the cost is low, the efficiency is high, and the reliability is high.

Description

The computer non-break power supply

The utility model relates to uninterrupted power supply (UPS) device by CPU (CPU) control, relate in particular to a kind of energy-storage battery charging circuit that has simultaneously, the computer non-break power supply of the central processing unit controls of voltage stabilizing Control and Feedback circuit and three functions of output waveform shaping circuit.

Uninterrupted power supply is when civil power is undesired, can be in time (in 10 MS) to supply with one section of equipment such as computer stable, clean power supply.It can be divided into off-line type and online (ON LI NE) two big classes.Wherein, the off-line type output waveform has sine to involve two kinds of staircase waveforms.Staircase waveform wherein be use at present maximum a kind of, it generally comprises one group of energy-storage battery 1-4, a main transformer 1-3, one group of control circuit 1-8, one group of charger 1-2, one group of converter 1-5, one group of testing circuit 1-1, one group of feedback circuit 1-6 and a shaping circuit 1-7, whole calcspar as shown in Figure 1.Wherein, control circuit 1-8 is the control centre of whole UPS, controls the running of each circuit.The function of testing circuit 1-1 is to detect the variation of input voltage, so that converter 1-5 can in time move when civil power is undesired.Charger 1-2 can convert civil power to the energy-storage battery energy, so that can supply electric power when having a power failure.It generally comprises one group of independently transformer and one group of charging circuit, if charging current is 1A, cell voltage is 24V, and then this transformer capacity promptly needs more than the 24VA, and volume and cost are all very considerable.Converter 1-5 a kind ofly becomes direct current into the circuit of interchange, and it need lean on feedback circuit 1-6 to adjust pulse duration to obtain stable output voltage.This feedback circuit 1-6 generally also needs independently transformer and a rectification, bleeder circuit.Main transformer 1-3 is 110V or the 220V high voltage that staircase waveform low-voltage that the change of current is produced boosts to civil power.The staircase waveform output voltage can produce a distorted waveform at silent period (DEADTIME) (as the T2 of Fig. 2), and reason is that the anti-remaining energy of output capacitor load that reaches of the leakance of main transformer can show with this distorted waveform in the silent period.Problems such as this distorted waveform can cause output voltage to raise, and main transformer is saturated are so must be eliminated.Traditional removing method is to add a damping shaping circuit at secondary or output, remaining energy in the silent period is eliminated, generally need a more powerful resistance R and a high-voltage power transistor Q to form a damping (DAMPING) circuit, to remain in the anti-energy of output capacitor load that reaches of main transformer leakance in each cycle via damping action, make output waveform obtain shaping and unlikely distortion, as shown in Figure 3.

Yet, traditional off-line type uninterrupted power supply need adopt 3 independently circuit finish the charging of above-mentioned energy-storage battery, three functions of voltage stabilizing Control and Feedback and output waveform shaping exist required element very many, volume is big, defectives such as failure rate height.

The purpose of this utility model is to overcome the above-mentioned defective of prior art, and the computer that a kind of cost is low, volume is little and safe and reliable non-break power supply is provided.

According to the utility model, a kind of computer non-break power supply is provided, this non-break power supply is made up of charging circuit, voltage stabilizing Control and Feedback circuit and output waveform shaping circuit, and it comprises the circuit that a transformer, a full-bridge rectifier, a CPU, a voltage adjuster and resistance, capacity cell are connected to form.

Three functions such as charging, voltage stabilizing Control and Feedback and output waveform shaping have been made up with non-break power supply according to the computer by central processing unit controls of the present utility model, reduced by two transformers with respect to traditional uninterrupted power supply circuit, a high-power resistance and more electronic component.

Below in conjunction with drawings and Examples computer of the present utility model is described in further detail with non-break power supply, other purposes of the present utility model, advantage and effect will become clearer in the following description.

Fig. 1 is the calcspar of the traditional uninterrupted power supply of expression,

Fig. 2 is the schematic diagram of the relation of expression uninterrupted power supply staircase waveform and output waveform,

Fig. 3 is that the uninterrupted power supply of expression prior art adds the schematic diagram of a damping shaping circuit at output,

Fig. 4 is the circuit diagram of expression computer of the present utility model with the embodiment of non-break power supply.

The utility model by the computer of central processing unit controls with non-break power supply on main transformer T with one group of tertiary coil N3 (as shown in Figure 4) and utilize CPU (not shown) to replace the control circuit of uniting.The 6805P9 type that CPU that uses such as MOTOROLA company produce to obtain accurate pulse duration control, is added said apparatus (as shown in Figure 4) and can be had three kinds of functions such as charging, voltage stabilizing Control and Feedback and output waveform shaping.The main transformer of general off-line UPS needs one group of iron core, and one group goes between and two groups of coils of primary and secondary, and the power output of its amount of capacity and UPS is relevant.The transformer of 500VA UPS for example, it is elementary, the capacity of secondary coil promptly needs 500VA.The shared iron core of non-break power supply of the present utility model, its capacity of the tertiary coil that is increased is less relatively, IA for example, the charging circuit of 24V system, its capacity only is slightly larger than 24VA, 5 percent of the circle of only serving as theme.So the cost of the required increase of tertiary coil N3 is low more than the transformer of general charger, and does not take up space.

Computer non-break power supply by central processing unit controls of the present utility model comprises-transformer T, and a full-bridge rectifier is by diode DI, D2, D3 and D4 form, a central processing unit CPU (not shown), three transistor QI, Q2, Q3, two diode D5, D6, a voltage adjuster U1 and some resistance, capacity cell, its characteristics are that this supply unit has charging circuit simultaneously, three kinds of functions such as voltage stabilizing Control and Feedback circuit and output waveform shaping circuit.Transformer T has three coils, and the first coil N1 is an input coil, and the second coil N2 is that output winding and tertiary coil N3 are damping (DAMPI NG) coil.Central processing unit CPU provides three groups of control point S1, S2 and S3.Wherein, S1 is the TI width (showing as Fig. 3) of control output waveform.S2 is the control charging circuit for controlling T2 width and S3.Charging circuit is by voltage adjuster UI, diode D5, D6, transistor Q2, Q3, full-bridge rectifier DI, D2, and D3, the control point S3 of D4 and central processing unit CPU and some resistance, capacity cell is formed.Voltage stabilizing Control and Feedback circuit is by resistance R I, R2, and the control point S1 of central processing unit CPU and some resistance, capacity cell are formed.The output waveform shaping circuit is by transistor Q1, full-bridge rectifier DI, D2, and D3, the control point S1 of D4, central processing unit CPU, S2 and some resistance, capacity cell is formed.

Again referring to Fig. 4.Wherein reference number F1 is a fuse, can not be burnt when unusual in order to protect this circuit.Diode D1-D4 constitutes full bridge rectifier, and the voltage commutation that tertiary coil N3 is responded to becomes pulsating direct current.Reference number QI is MOSFET or transistor, and its control utmost point signal is by the S2 control of CPU.CPU calculates in the T2 cycle and answers open pulse bandwidth to avoid and TI or the overlapping and overheated element that burns of T3 cycle.When transistor Q1 conducting, its impedance phase is very low for tertiary coil N3, so voltage is controlled in zero potential, and output waveform can obtain perfect staircase waveform, and reaches the function of waveform shaping.R1 and R2 are bleeder circuits, and it can be reduced to pulsating dc voltage CPU acceptable voltage.CPU becomes digital value VF via the S1 control point with this voltage transitions, and (SQ (VF)/T) can calculate the size of pulse width T 1 and be adjusted, and finishes the purpose of Voltage Feedback, and then output voltage can be stablized within limits according to RMS formula V=SQR.Pulsating direct current can obtain a direct voltage more stably via the filter circuit Hou that diode D5 and capacitor C1 form.The circuit that voltage adjuster U1, resistance R 4 and R5 form can be set charging voltage value, resistance R 6 and transistor Q2 can limit maximum charging current, transistor Q3 and resistance R 7 then compare cell voltage by the S3 control point through CPU, whether control will charge, and so can constitute a perfect charging circuit.

Below in conjunction with the accompanying drawings and embodiments computer of the present utility model has been made detailed description with non-break power supply.Those skilled in the art also can make various modifications and conversion to this according to above-mentioned design of the present utility model, but these are revised and conversion all belongs to scope of the present utility model.

Claims

1. computer non-break power supply, it is characterized in that being made up of charging circuit, voltage stabilizing Control and Feedback circuit and output waveform shaping circuit, it comprises the circuit that a transformer, a full-bridge rectifier, a CPU, a voltage adjuster and resistance, capacity cell are connected to form.

2. according to the non-break power supply of claim 1, it is characterized in that described transformer has three groups of coils, first coil is an input coil, and second coil is that output winding and tertiary coil are damping coil.

3. according to the non-break power supply of claim 1, it is characterized in that described CPU provides three groups of control point S1, S2 and S3, wherein, control point S1 detects output voltage, the width of control point S2 control staircase waveform silent period T2, control point S3 controls charging circuit.

4. according to the non-break power supply of claim 1, it is characterized in that described charging circuit by voltage adjuster UI, diode D5, D6, transistor Q2, Q3, the control point S3 of full-bridge rectifier DI, D2, D3, D4 and CPU and resistance, capacity cell are formed.

5. according to the non-break power supply of claim 1, it is characterized in that described voltage stabilizing Control and Feedback circuit by tertiary coil N3, resistance R I, R2, the control point S1 of CPU and resistance, capacity cell are formed.

6. according to the non-break power supply of claim 1, it is characterized in that described output waveform shaping circuit by tertiary coil N3, transistor Q1, full-bridge rectifier D1, D2, D3, D4, the control point S2 of CPU and resistance, capacity cell are formed.