CN85201577U - Short-term storage power source for computer - Google Patents
Short-term storage power source for computer Download PDFInfo
- Publication number
- CN85201577U CN85201577U CN 85201577 CN85201577U CN85201577U CN 85201577 U CN85201577 U CN 85201577U CN 85201577 CN85201577 CN 85201577 CN 85201577 U CN85201577 U CN 85201577U CN 85201577 U CN85201577 U CN 85201577U
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- inverter
- computer
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- power source
- equipment
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Abstract
A minimum microcomputer system replaces the logic circuit in an uninterrupted electric source to realize pulse width modulation (PWM) on an inverter. Sine-waves of small distortion and stable frequency are output, and in addition, the design and the debugging of the circuit are simplified. As long as different programs are applied, the output and the management functions of the equipment can be changed, and the reliability is improved because of use of the microcomputer. A large volume capacitor is used for energy storage, and the pulse frequency modulation is used for supply electricity to the inverter. Under the condition of no reserve direct-current electric source, the power supply time can be maintained more than 30 ms during emergency powerdown. The utility model can satisfy the requirements of carrying out necessary operation processing when electricity is modulated, of equipment such as a computer, etc.
Description
The utility model belongs to the power supply class, is used to realize uninterruption power source.
At present, more rudimentary uninterruption power source is a square wave through the interchange of inverter output, and during the external power outage, change-over time is long, needs 100ms more than the time, is not suitable for requiring as computer etc. the uninterruption power source of the important and precision equipment of uninterrupted power supply.In the international market, have the little sine wave of output distortion degree in recent years and changed uninterruption power source equipment fast, it is to the modulation of inverter, adopt analog-and digital-logical circuit, workloads such as for example No. 4325112 its designs of described equipment of United States Patent (USP), installation, debugging are big and complicated, and reliability is lower, cost is high.
The purpose of this utility model is to adopt the system controlled by computer inverter, makes its simplicity of design, and it is convenient to install, debug; Adopt the capacitance energy storage technology simultaneously, like this can be under the situation of no reserve DC power supply, when the external power sudden power took place, conversion immediately made equipment can keep the above power-on time of 30ms, satisfies the power cut-off information protection of precision equipments such as computer.
Main points of the present utility model are: with the microcomputer minimum system of the special use pulse modulation signal that inverter is required, establishment becomes the needed pulse sequence program of generation, be stored in the read-only memory 11, carry out by central processing unit 10, by interface 8, deliver to driver 6 and 7, modulated inverter, make the inverter output distortion little, the sine wave that frequency is suitable.In fact, because be programmable to the pulse width modulation of inverter, thus the waveform of output and other are required to change easily, thus satisfied factory or user's needs.For example, be programmed for sine pulse modulation, multiple-pulse modulation, and the modulation of other requirements etc., its output frequency, but can be by prior programming decision and real time altering, its stability is the stability of microcomputer clock frequency.
The utility model is under the condition of no back-up source, keeps the above power-on time of 30ms during outage.For on the mode and circuit of direct current energy, the method that has adopted large bulk capacitance to keep certain power-on time is: at the output of 220V rectifier 1, be connected to the electrolysis storage capacitor 2 of capacity greater than filtering requirements for inverter.By the 220V mains-supplied time, the voltage of the charging of its electric capacity 2 is higher than the about 100V of operating voltage of inverter, these electric capacity 2 deposits keep the above electric energy of power supply 30ms, during outage, by driver 4, to inverter power supply by pulse frequency modulator 13 controls.
Relevant technologies explanation of the present utility model:
One, the facility that has nothing to do with the utility model in the appended circuit diagram excludes.For example, circuit such as startup, protection are unreceipted.Circuit diagram is seen accompanying drawing 1.
Two, the minimum microsystem that is used for control inverter is made up of CPU10, ROM11, interface 8.The sine pulse modulating time train of impulses of output; (for example every half cycle has 10 Sine Modulated pulses) writes the program in BASIC that calculates the train of impulses on request; send into computer and calculate and print the result; write the assembler that realizes burst length series with its result; and relevant startup and defence program; transfer above program to object program and write the EPROM(EROM) as the TSR of microcomputer minimum system; be the program of control inverter, program flow chart is seen accompanying drawing 2.
Three, big capacity storage capacitor is kept the power supply of above time of 30ms, its method is to storage capacitor 2 chargings by 220V rectifier 1, in PFM mode (pulse frequency modulated) to inverter power supply, because of the voltage on the electric capacity 2 is higher than about inverter operating voltage 100V, so can when outage, keep the above power-on time of 30ms.
The numerical computations of relevant electric capacity 2 is as follows:
The specified output 1000VA of equipment efficient 85%
External power lowest effective value: (establish the external power fluctuation and be ± 15%)
E
m＝220V×（1－0.15）＝187V
Rectification output mean direct voltage
E
d＝1.2E
m＝1.2×187＝224.4V
(work as WCR
L＞15 R
i/ R
L＜5% o'clock E
dWith E
mBetween approximation relation, wherein W is the 220V supply frequency, C=C
0Filter capacitor, R
LBe load equivalent resistance, R
iBe the internal resistance of rectifier)
Equivalent load resistance
R
L＝E
2 d／（P
0／n）＝224.4／（1000／0.85）＝42.8Ω
Choose the rectification equivalent internal resistance
R
i=1 Ω (being mainly the rectifying tube forward voltage drop)
The inverter operating voltage
E
0＝150V
－
As retention time T
HRequirement is
T
H＝30ms
Then:
Get C
0=2500 μ f
Nuclear mark WCR
L=100 π * 2500 * 10
-6* 42.8=33.6(＞15)
Satisfy E
d=1.2E
mCondition
Adopt the utility model, not only circuit is simple, and reliability height, cost are low.For example the electric original equipment market reference price that do not have a power failure of 1KVA capacity is 7000 yuan now, uses the same capacity uninterruption power source equipment cost estimation of the utility model production will be lower than 1000 yuan.
Claims (1)
1, a kind of uninterruption power source equipment that constitutes by rectifier, inverter, storage capacitor, pulse frequency modulation circuit, pulse amplitude modulation circuit, power-fail detection circuit, high frequency filter.It is characterized in that adopting large bulk capacitance, employing to add the minimum Control System of Microcomputer that EPROM (or ROM) PWM signal output interface body is formed by CPU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85201577 CN85201577U (en) | 1985-05-19 | 1985-05-19 | Short-term storage power source for computer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85201577 CN85201577U (en) | 1985-05-19 | 1985-05-19 | Short-term storage power source for computer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN85201577U true CN85201577U (en) | 1986-10-08 |
Family
ID=4797611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85201577 Ceased CN85201577U (en) | 1985-05-19 | 1985-05-19 | Short-term storage power source for computer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85201577U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100335312C (en) * | 2002-08-01 | 2007-09-05 | 罗伯特-博希股份公司 | Controller in a vehicle |
-
1985
- 1985-05-19 CN CN 85201577 patent/CN85201577U/en not_active Ceased
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100335312C (en) * | 2002-08-01 | 2007-09-05 | 罗伯特-博希股份公司 | Controller in a vehicle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CE01 | Termination of patent right | ||
| CE01 | Termination of patent right |
Termination date: 19870422 |