CN1113448C - Power supply load balance device - Google Patents
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- CN1113448C CN1113448C CN 98122445 CN98122445A CN1113448C CN 1113448 C CN1113448 C CN 1113448C CN 98122445 CN98122445 CN 98122445 CN 98122445 A CN98122445 A CN 98122445A CN 1113448 C CN1113448 C CN 1113448C
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Abstract
The present invention relates to a power supply load balancing device which is used for being connected with a backup power supply used for supplying power needed by the operation of the whole electronic system, and the backup power supply comprises more than two power supplies mutually connected in parallel. The present invention is characterized in that the power supply load balancing device inducts the load voltage of each power supply, the load voltage is output to a microprocessor after being rectified and filtered, and each load voltage value is summed and averaged to obtain an average value. Each value of the load voltage is compared with the average value, and therefore, a load whose load voltage value is more than the average value is decreased until the load of each power supply is balanced.
Description
The present invention relates to a kind of power supply load balance device, relate in particular to the power supply load balance device that a kind of power source loads that adopts digitized mode to make each power supply unit of backup formula power supply unit reaches real balance.
Along with the arriving of information age, make that the utilization rate of computer is more and more high, relatively, the serious forgiveness of computer also must be more and more high, so there is backup formula power supply unit to produce.Power supply unit mainly is exactly to be used for supplying whole electronic system (as desktop computer, notebook computer etc.) operation required power supply, backup formula power supply unit then is that the power supply unit more than two is parallel with one another, to supply whole electronic system operation required power supply simultaneously.
As shown in Figure 1, this is a kind of backup formula power supply unit 1 of prior art, it is by two power supply units 10,11 in parallel formation, to supply whole electronic system 12 operations required power supply simultaneously, because the electronic system 12 required power supplys of operation (for example 100W) are by two power supply units 10,11 provide simultaneously that (for example one provides 80W, another provides 20W), with respect to all power supplys (100W) are provided by the single power supply supply, it is preferable that yes, yet, the backup formula power supply unit 1 of prior art shown in Figure 1 but has following shortcoming in the use: its power source loads can't be made mean allocation and (as above give an example, provide 80W when one, another provides 20W), it is uneven to cause power source loads to distribute easily, make the higher life-span of power source loads reduce, and reliability reduces, when the power supply unit of parallel connection is many more, this kind phenomenon is obvious more.
As shown in Figure 2, this is the backup formula power supply unit 2 of another kind of prior art, has the function that power source loads distributes, it is by two power supply units 20,21 in parallel formation, to supply whole electronic system 22 operations required power supply simultaneously, each power supply unit 20 or 21 all is by detected corresponding power supply 20 or 21 power source loads of being exported by resistance R CS, its load trim circuits 23 of then utilizing that power source loads is lower will be used for controlling the power source loads raising that stable pulse-width modulation (PWM) control circuit of exporting 24 of power supply unit is exported, all power supply units 20 up to parallel connection, 21 power source loads reaches till the balance, power supply unit 20 originally for example, 21 provide 80W and 20W respectively, then by can be with power source loads junior (power supply unit 21 by its other load trim circuits 23 and pwm control circuit 24, power source loads 20W) is increased to 50W, (power supply unit 20, power source loads 80W) is reduced to 50W to power source loads the higher person automatically simultaneously.Though the function that the backup formula power supply unit 2 of this kind prior art has the power source loads mean allocation, following shortcoming still had:
(1) because the comparator 230 of load trim circuits 23 has the restriction of skew (offset) voltage, so that 2 of X, Y will just can move more than the definite value at certain, therefore must just can reach the power supply load balance distribution under high load condition.
(2) power consumption, efficient is poor.Owing to utilize resistance R CS to detect corresponding power supply 20 or 21 power source loads of being exported, so that each power supply unit 20,21 all can produce consumption on resistance R CS when out-put supply, for instance, if each power supply unit 20,21 is output as+5V 40A/+3.3V 20A/+12V 16A, and hypothesis resistance R CS=5m Ω P=I
2R=(40+20+16)
2* 5m Ω=28.88W that is to say, each power supply unit 20,21 all can consume 28.88W on resistance R CS when out-put supply.
(3) temperature stability is relatively poor.Because resistance R CS is the resistance of metal material, can temperature influence and make change in resistance, make its temperature stability relatively poor.
(4) the big V=IR=(40+20+16) of voltage regulation * 5m Ω=0.38V.Owing to use the relation of resistance R CS, so that the output voltage of each power supply unit 20,21 all can produce the pressure drop of 0.38V on resistance R CS.
(5) good ground connection must be arranged, otherwise can produce very severe noise interference, and then have influence on the load adjustment of each power supply unit 20,21, cause misoperation.
(6) owing to be to adopt the mode (power source loads junior's power source loads is improved) that adjusts upward when adjusting for the power source loads of each power supply unit 20,21, when circuit abnormal, cause output voltage too high easily, and then burn the electronic component in the electronic system.
(7) circuit complexity and cost height.Because each power supply unit 20,21 all has a load trim circuits 23, and each load trim circuits 23 all is made of the linear calculating circuit of a complexity of formation considerable element; If in the time of will expanding the quantity of power supply unit, then must add more load trim circuits, make the circuit of whole backup formula power supply unit more complicated, and the cost height.
Main purpose of the present invention is to provide a kind of improved power supply load balance device, and it can prolong the useful life of each power supply unit, and can improve the reliability and stability of power supply load balance device.
The object of the present invention is achieved like this:
A kind of power supply load balance device and one is used for supplying the backup formula power supply unit that whole electronic system moves required power supply and is electrically connected, and this backup formula power supply unit comprises power supply unit parallel with one another more than two; Be characterized in that this power supply load balance device comprises: two above sensing elements, they respectively correspondence be connected in a power supply unit, the load voltage that is used for responding to corresponding power supply unit is an alternating current; Two above rectifications, filter circuit, they respectively correspondence be connected in a sensing element, be used for the load voltage of this sense element senses output is carried out rectification, filtering output DC then; An and microprocessor, it and described rectification, filter circuit connects, be used for each rectification, the load voltage value summation of the corresponding power supply that filter circuit is imported is also on average to obtain a mean value, again each load voltage value and mean value are made comparisons, when load voltage value during greater than mean value, this microprocessor is promptly exported a load and is adjusted signal to the power supply unit of load voltage value greater than mean value, to downgrade the load of this power supply unit, simultaneously the load voltage value is to increase its load voltage value automatically less than the power supply unit of mean value, and the load that above-mentioned action will continue to carry out each power supply unit reaches till the balance.
In above-mentioned power supply load balance device, wherein, described this power supply load balance device also comprises the delay circuit more than two, each delay circuit connects with this microprocessor and corresponding power supply unit respectively, this microprocessor is after signal is adjusted in output loading, will be at first via this delay circuit with signal delay, just export the power supply unit of correspondence to, thereby can make the load adjustment carry out comparatively smoothly.
In above-mentioned power supply load balance device, wherein, described sensing element is a transformer.
The present invention makes it compared with prior art owing to adopted above-mentioned technical scheme, not only can prolong the life-span of each power supply unit, and can improve the reliability and stability of power supply load balance device.
By the description of a following embodiment to power supply load balance device of the present invention, can further understand purpose of the present invention, concrete structure modulation and advantage in conjunction with its accompanying drawing.Wherein, accompanying drawing is:
Fig. 1 is a kind of circuit diagram of backup formula power supply unit of prior art.
Fig. 2 is the circuit diagram of the backup formula power supply unit of another kind of prior art.
Fig. 3 is the circuit diagram according to the power supply load balance device of the present invention's proposition.
Fig. 4 is according to the microcontroller circuit figure in the power supply load balance device of the present invention's proposition.
As shown in Figure 3, power supply load balance device of the present invention, be electrically connected with a backup formula power supply unit that is used for supplying the required power supply of whole electronic system 32 (as desktop computer, notebook computer etc.) operation, this backup formula power supply unit comprises power supply unit parallel with one another more than two, at this is that power supply unit 30,31 with two parallel connections is the explanation of example as preferred embodiment of the present invention, and each power supply unit 30,31 all has pulse-width modulation (PWM) control circuit 300,310 that is used for adjusting its output voltage stabilization degree of control; The power supply load balance device of preferred embodiment of the present invention comprises two sensing elements consistent with power supply unit 30,31 quantity 40, two rectifications, filter circuit 41, microprocessor 42 and two delay circuits 43.
Described rectification, filter circuit 41, correspondence is connected in a sensing element 40 respectively, comprise the capacitor 411 that a bridge rectifier 410 and a filtering are used, the load voltage of aforementioned this sensing element 40 induction outputs at first carries out rectification via bridge rectifier 410, then again by capacitor 411 filtering output DC then.
This microprocessor 42, referring to shown in Figure 4, at this is to be numbered the microprocessor 42 of PIC16C73 as preferable enforcement with one, this microprocessor 42 that is numbered PIC16C73 can be connected use with four power supply units at most, what accepted is the input (input load voltage) of simulation and the output (output loading adjustment signal) of making numeral, this microprocessor 42 and described rectification, filter circuit 41 connects, be used for each rectification, the corresponding power supply 30 that filter circuit 41 is imported, 31 load voltage value summation is also on average to obtain a mean value, then each load voltage value and mean value are made comparisons, when load voltage value during greater than mean value, this microprocessor 42 promptly export a load adjust signal to the load voltage value greater than the power supply unit 30 of mean value or 31 control circuit for pulse- width modulation 300 or 310, to downgrade the load of this power supply unit 30 or 31, simultaneously, when load voltage value during less than mean value, power supply unit 31 or 30 can increase its load voltage value automatically, and above-mentioned action will continue to carry out each power supply unit 30,31 load reaches till the balance.
Each delay circuit 43 is connected with the control circuit for pulse-width modulation 300,310 of this microprocessor 42 and corresponding power supply 30,31 respectively, it comprises a resistor R 1 and a capacitor C1, this microprocessor 42 is after signal is adjusted in output loading, will be at first via this delay circuit 43 with signal delay, just export the control circuit for pulse- width modulation 300 or 310 of corresponding power supply 30 or 31 to, thereby can make the load adjustment carry out comparatively smoothly.
Suppose that the required power supply of these electronic system 32 operations is 100W, and power supply unit 30,31 provides 80W and 20W respectively when this electronic system 32 start just, then the action of the power supply load balance device of preferred embodiment of the present invention execution power source loads distribution is as follows:
(1) at first this microprocessor 42 can receive via sensing element 40 and detects, and the load voltage value of the corresponding power supply of being imported after the rectification of rectification, filter circuit 41 and the filtering 30,31.
(2) this microprocessor 42 is understood load voltage value (80W and the 20W) summation of the power supply unit 30,31 that will be imported also on average to obtain a mean value (50W).
(3) this microprocessor 42 then can be made comparisons received each load voltage value (80W, 20W) respectively with mean value (50W), because the load voltage value (80W) of power supply unit 30 is greater than mean value (50W), this microprocessor 42 can output one load be adjusted signal to the control circuit for pulse-width modulation 300 of load voltage value greater than the power supply unit 30 of mean value, to downgrade the load of this power supply unit 30, the load voltage value can increase its load voltage value automatically less than the power supply unit 31 of mean value simultaneously.
(4) above-mentioned action (1)～(3) will continue to carry out for several times, till the load of each power supply unit 30,31 reaches balance (50W, 50W).
More than be to have 30,31 the explanations of two power supply units as preferred embodiment, and when no matter being two, three or four power supply units, as long as the load voltage value is higher than mean value, all load voltage values exceed the power supply unit of mean value, its load voltage value all can " be adjusted downwards ", makes the load of each power supply unit reach balance.
In sum, power supply load balance device of the present invention has following advantage thus owing to adopted above-mentioned technical scheme:
(1) microprocessor at every turn can putting down at the load power source of trying to achieve all power supply units After the average, just compare, adjust action, therefore can reach the real balance of load, to prolong The life-span of long each power supply unit, and the reliability of this device of raising and stability.
(2) the present invention does by the resistor RCS that is replaced prior art by sensing element The detection of load variations, sensing element comparatively linear and of the present invention is than the resistance of prior art Device RCS more is difficult for being acted upon by temperature changes.
(3) use by delay circuit is so that the adjustment of power source loads is carried out comparatively Smoothly.
(4) the present invention is owing to adopt the mode of " adjusting " to adjust the confession of backup formula power supply downwards Answer the load output of all power supply units of device, with the power-of the higher person that power supply is loaded Carry downwards and adjust, can effectively avoid thus when circuit abnormal, causing the output voltage mistake Height, and then the situation of burning the electronic component in the electronic system.
(5) the present invention distributes by done power source loads by microprocessor, so can be according to backup The power supply unit quantity flexibility of formula power supply unit expands whole power supply load balance device Hardware.
(6) because microprocessor of the present invention can reach according to the quantity of all power supply units every The load power source value of one power supply unit is tried to achieve on average, therefore can avoid because noise jamming is advanced And have influence on the adjustment of load of each power supply unit and the misoperation that causes.
(7) early warning (pre-fail-detection) of overload can be further done by power supply load balance device of the present invention, when meeting the situation of overload or undesired situation, suitable processing (for example give the alarm or shut down) can be done, to protect whole electronic system.
(8) circuit reduction and significantly reducing cost because the present invention distributes by the adjustment of being done power source loads by digitized microprocessor, with respect to prior art, the invention enables the circuit reduction of whole power supply load balance device and significantly reduces cost.
Claims (3)
1. power supply load balance device and one is used for supplying the backup formula power supply unit that whole electronic system moves required power supply and is electrically connected, and this backup formula power supply unit comprises power supply unit parallel with one another more than two; It is characterized in that this power supply load balance device comprises:
Two above sensing elements, they respectively correspondence be connected in a power supply unit, the load voltage that is used for responding to corresponding power supply unit is an alternating current;
Two above rectifications, filter circuit, they respectively correspondence be connected in a sensing element, be used for the load voltage of this sense element senses output is carried out rectification, filtering output DC then; And
One microprocessor, it and described rectification, filter circuit connects, be used for each rectification, the load voltage value summation of the corresponding power supply that filter circuit is imported is also on average to obtain a mean value, again each load voltage value and mean value are made comparisons, when load voltage value during greater than mean value, this microprocessor is promptly exported a load and is adjusted signal to the power supply unit of load voltage value greater than mean value, to downgrade the load of this power supply unit, simultaneously the load voltage value is to increase its load voltage value automatically less than the power supply unit of mean value, and the load that above-mentioned action will continue to carry out each power supply unit reaches till the balance.
2. power supply load balance device as claimed in claim 1 is characterized in that:
Described this power supply load balance device also comprises the delay circuit more than two, each delay circuit connects with this microprocessor and corresponding power supply unit respectively, this microprocessor is after signal is adjusted in output loading, will be at first via this delay circuit with signal delay, just export corresponding power supply unit to, thereby can make the load adjustment carry out comparatively smoothly.
3. power supply load balance device as claimed in claim 1 is characterized in that: described sensing element is a transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98122445 CN1113448C (en) | 1998-11-16 | 1998-11-16 | Power supply load balance device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98122445 CN1113448C (en) | 1998-11-16 | 1998-11-16 | Power supply load balance device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1254213A CN1254213A (en) | 2000-05-24 |
| CN1113448C true CN1113448C (en) | 2003-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98122445 Expired - Fee Related CN1113448C (en) | 1998-11-16 | 1998-11-16 | Power supply load balance device |
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| CN (1) | CN1113448C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI475780B (en) * | 2012-08-09 | 2015-03-01 | Giga Byte Tech Co Ltd | Switching power supply device with load balance function |
| WO2016006977A1 (en) * | 2014-07-11 | 2016-01-14 | Encored Technologies, Inc. | Apparatus, server, system and method for energy measuring |
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1998
- 1998-11-16 CN CN 98122445 patent/CN1113448C/en not_active Expired - Fee Related
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| CN1254213A (en) | 2000-05-24 |
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