CN104167921B - Switch power parallel maximum streaming digital control method and circuit - Google Patents
Switch power parallel maximum streaming digital control method and circuit Download PDFInfo
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- CN104167921B CN104167921B CN201410384713.2A CN201410384713A CN104167921B CN 104167921 B CN104167921 B CN 104167921B CN 201410384713 A CN201410384713 A CN 201410384713A CN 104167921 B CN104167921 B CN 104167921B
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Abstract
Switch power parallel provided in an embodiment of the present invention maximum streaming digital control method and circuit, are related to the control of Switching Power Supply, have output voltage self-recovering function, can avoid the harmful competition problem of output voltage between each Switching Power Supply.The circuit includes：Maximum streaming digital controller, judges whether stream difference signal is more than and flows difference threshold；If difference signal is flowed more than difference threshold is flowed, when sharing control signal is not reaching to maximum, sharing control signal is increased into a step-length；If difference signal is flowed less than difference threshold is flowed, when sharing control signal is not reaching to minimum of a value, sharing control signal is reduced into a step-length；Sharing control signal after output adjustment.It is mainly used in Switching Power Supply maximum streaming digital control.
Description
Technical field
The present invention relates to the control of Switching Power Supply, more particularly to a kind of maximum streaming digital control method of switch power parallel
And circuit.
Background technology
It is to improve an effective ways of Switching Power Supply power output that multiple stage switch power parallel externally provides load energy.
But realize that multiple stage switch power parallel runs, need to be aided with parallel Operation Control method.
Maximum current equalizing method is a kind of method for realizing the operation control of Switching Power Supply output-parallel, and general is by special
Simulation control chip, and with reference to some peripheral analog circuits realizing.The output voltage control outer shroud of Switching Power Supply is adopted
Voltage error amplifier inside UC3907, sharing control inner ring are compensating loop using the regulation amplifier inside UC3907
In, larger gain is obtained in low frequency by way of using resistance and capacitances in series, can reach higher control accuracy.
When stating maximum current equalizing method on the implementation, inventor has found：This employing specialized simulation control chip is realized maximum
The mode of sharing control, needs extra control circuit, and needs to change hardware during adjusting parameter.In addition, work as opening to multiple stage
When powered-down source carries out sharing control, the output voltage of each power supply can be caused to increased, and neither one controlling mechanism makes output
Voltage rolls back initial voltage, the harmful competition situation of output voltage occurs, ultimately result in output voltage and be increased to when serious
Uncontrollable degree.
The content of the invention
In order to solve above-mentioned technical problem, the embodiment of the present invention provides a kind of maximum streaming digital control of switch power parallel
Method and circuits, is capable of achieving the maximum sharing control of Switching Power Supply, and has output voltage self-recovering function, can avoid each
The harmful competition problem of output voltage between Switching Power Supply.
Specifically solving technical scheme is：
On the one hand, the maximum streaming digital control method of a kind of switch power parallel, including：
Difference signal is flowed in inquiry；
Judge whether stream difference signal is more than and flow difference threshold；
If difference signal is flowed more than difference threshold is flowed, judge whether sharing control signal reaches maximum；
If sharing control signal is not reaching to maximum, sharing control signal is increased into a step-length；
If difference signal is flowed less than difference threshold is flowed, judge whether sharing control signal reaches minimum of a value；
If sharing control signal is not reaching to minimum of a value, sharing control signal is reduced into a step-length；
Sharing control signal after output adjustment.
On the other hand, the maximum fluxion word control circuit of a kind of switch power parallel, including：The control of maximum streaming digital
Device, the maximum equalizing controller inquiry flow difference signal；Judge whether stream difference signal is more than and flow difference threshold；If
Difference signal is flowed more than difference threshold is flowed, then judge whether sharing control signal reaches maximum；If sharing control signal
Maximum is not reaching to, then sharing control signal is increased into a step-length；If flowing difference signal and being less than and flow difference threshold,
Then judge whether sharing control signal reaches minimum of a value；If sharing control signal is not reaching to minimum of a value, sharing control is believed
Number reduce a step-length；Sharing control signal after output adjustment.
Switch power parallel provided in an embodiment of the present invention maximum streaming digital control method and circuit so that output current
Signal increases less than the switch power source output voltage of current equalizer signal, so as to increase the output current value of the Switching Power Supply, and
Reach the effect that the output current of Switching Power Supply output current less than normal is increased.After Switching Power Supply performs maximum sharing control,
The output voltage of each out-put supply reaches an equalization point, so as to reach the effect flowed.In addition, all switch electricity in parallel
In source, that maximum Switching Power Supply of output current, in the presence of maximum current-sharing control method, can reduce the defeated of itself automatically
Go out voltage, so as to reduce exporting the voltage between positive bus-bar and output negative busbar, reach the function that output voltage recovers automatically.
Description of the drawings
Included accompanying drawing is used for providing being further understood from the embodiment of the present invention, which constitutes of specification
Point, for illustrating embodiments of the invention, and come together to explain the principle of the present invention with word description.It should be evident that below
Accompanying drawing in description is only some embodiments of the present invention, for those of ordinary skill in the art, is not paying creation
Property it is laborious on the premise of, can be obtaining other accompanying drawings according to these accompanying drawings.
Fig. 1 is a kind of flow chart of the maximum streaming digital control method of switch power parallel provided in an embodiment of the present invention；
Fig. 2 is a kind of structural representation of the maximum fluxion word control circuit of switch power parallel provided in an embodiment of the present invention
Figure；
Fig. 3 is the maximum fluxion word control circuit schematic diagram of multiple switch power sources in parallel provided in an embodiment of the present invention.
Specific embodiment
The specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing.In the following description, for solution
Release and nonrestrictive purpose, elaborate detail, to help be apparent from the present invention.However, to people in the art
It is readily apparent that the present invention can also be put into practice in the other embodiments departing from these details for member.
Here is it should be noted that in order to avoid the present invention has been obscured because of unnecessary details, only show in the accompanying drawings
The device structure closely related with scheme of the invention and/or process step are gone out, and have eliminated with relation of the present invention not
Big other details.
Embodiment 1
The embodiment of the present invention provides a kind of switch power parallel maximum streaming digital control method, as shown in figure 1, including：
101st, difference signal is flowed in inquiry；
102nd, judge whether stream difference signal is more than and flow difference threshold；
If the 103, difference signal is flowed more than difference threshold is flowed, judge whether sharing control signal reaches maximum
Value；
If the 104, sharing control signal is not reaching to maximum, sharing control signal is increased into a step-length, step is performed
Rapid 107；
If the 105, difference signal is flowed less than difference threshold is flowed, judge whether sharing control signal reaches minimum
Value；
If the 106, sharing control signal is not reaching to minimum of a value, sharing control signal is reduced into a step-length；
107th, export sharing control signal.
The maximum streaming digital control method of switch power parallel that the present embodiment is provided so that output current signal is less than equal
The switch power source output voltage of streamline signal increases, and so as to increase the output current value of the Switching Power Supply, and reaches and will export
The effect of the output current increase of electric current Switching Power Supply less than normal.After Switching Power Supply performs maximum sharing control, each output electricity
The output voltage in source reaches an equalization point, so as to reach the effect flowed.In addition, output electricity in all Switching Power Supplies in parallel
That maximum Switching Power Supply of stream, in the presence of maximum current-sharing control method, can reduce the output voltage of itself automatically, so as to
The voltage between output positive bus-bar and output negative busbar is reduced, the function that output voltage recovers automatically is reached.
Embodiment 2
Used as the improvement of above-described embodiment, the embodiment of the present invention provides another kind of switch power parallel maximum streaming digital control
Method processed, circuit realiration as shown in Figure 2, the circuit include the equal streaming digital controller of maximum, adder, a subtraction
Device, current sampler, diode, output voltage reference value generator, a switch power controller and
Individual power supply major loop.
Wherein, the output end of output voltage reference value generator is connected with one of input positive terminal of adder, maximum
The output end of fluxion value controller is connected with another input positive terminal of adder, output end and the Switching Power Supply control of adder
The input of device processed is connected, and the output end of switch power controller is connected with the input of Switching Power Supply main circuit, beginning power supply
Main circuit has output main track and output negative wire.Current sampler is serially connected on output main track, output end one end of current sampler
The anode of diode is connected on, the negative terminal of another termination subtracter, the negative electrode of diode connect current equalizer.Current equalizer letter on current equalizer
Number enter the anode of subtracter, the input of the maximum streaming digital controller of output termination of subtracter.
Specific switch power parallel maximum streaming digital control method includes：
First, on the one hand the output current signal on current sampler collection output main track, the output current signal enter
The negative terminal of subtracter, on the other hand into the anode of diode, the negative electrode of diode is connected on current equalizer, on the current equalizer
Signal is current equalizer signal, and the current equalizer signal enters the anode of subtracter, by current equalizer signal and output current in subtracter
Signal does subtraction, is flowed difference signal, into maximum streaming digital controller.
Secondly, maximum equalizing controller performs control flow as shown in Figure 1 with fixed frequency cycle：
Inquire about first and flow difference signal, whether then judge to flow difference signal more than difference threshold is flowed, if
Stream difference signal is more than flowing difference threshold, then judges whether sharing control signal reaches maximum, if sharing control signal
Maximum is reached, then keeps sharing control signal constant, if sharing control signal is not reaching to maximum, by sharing control
Signal increases a step-length.If when judging whether to flow difference signal more than difference threshold is flowed, judging to flow difference
Signal is less than and flows difference threshold, then judges whether sharing control signal reaches minimum of a value, if sharing control signal reaches most
Little value, then keep sharing control signal constant, if sharing control signal is not reaching to minimum of a value, sharing control signal subtracted
A little step-length.By above control flow, maximum equalizing controller exports a sharing control signal.
An anode of the sharing control signal that maximum equalizing controller is produced into adder, and output voltage reference value
Output voltage reference signal is supplied to generator another anode of adder, and adder is by output voltage reference signal and
After flow control signals do addition, obtain given voltage signal, and be supplied to switch power controller, switch power controller according to
Given voltage signal produces power control signal and is supplied to Switching Power Supply major loop, the work of controlling switch power supply major loop.
When multiple stage Switching Power Supply output-parallel runs, the connected mode of circuit is as shown in figure 3, there is the feelings of n platform Switching Power Supplies
Under condition, the output main track "+" of all Switching Power Supplies is connected on output positive bus-bar 303, then by the output of all Switching Power Supplies
Negative wire "-" is connected in output negative busbar 304.Switching Power Supply 1 (301) is to Switching Power Supply n (302) by exporting positive bus-bar 303
It is common with output negative busbar 304 that load 309 is powered.In addition, the current equalizer of all Switching Power Supplies is connected to current equalizing bus bar again
On 305, ensure that every Switching Power Supply exports identical electricity by the streaming digital control method of the maximum inside every Switching Power Supply
Stream.
N platforms switch power parallel together to 309 power supply of load in the case of, the signal on current equalizing bus bar 305 is from opening
The output current signal 116 of that the maximum power supply of output current in Switching Power Supply n (305) of powered-down source 1 (301), i.e., should
The output current signal 116 of platform power supply is the current equalizing bus bar signal 306 on current equalizing bus bar.Due to the stream of each Switching Power Supply
Line 119 is connected with current equalizing bus bar 305, so now all Switching Power Supplies all use the current equalizer signal 306 on current equalizing bus bar
As the current equalizer signal 117 of itself.
The maximum streaming digital control method of switch power parallel that the present embodiment is provided so that output current signal is less than equal
The switch power source output voltage of streamline signal increases, and so as to increase the output current value of the Switching Power Supply, and reaches and will export
The effect of the output current increase of electric current Switching Power Supply less than normal.After Switching Power Supply performs maximum sharing control, each output electricity
The output voltage in source reaches an equalization point, so as to reach the effect flowed.In addition, output electricity in all Switching Power Supplies in parallel
That maximum Switching Power Supply of stream, in the presence of maximum current-sharing control method, can reduce the output voltage of itself automatically, so as to
The voltage between output positive bus-bar and output negative busbar is reduced, the function that output voltage recovers automatically is reached.
Embodiment 3
The embodiment of the present invention provides a kind of switch power parallel maximum fluxion word control circuit, including：Maximum fluxion
Word controller, the maximum equalizing controller inquiry flow difference signal；Judge to flow difference signal whether more than stream difference threshold
Value；If difference signal is flowed more than difference threshold is flowed, judge whether sharing control signal reaches maximum；If stream control
Signal processed is not reaching to maximum, then sharing control signal is increased a step-length；If it is poor less than flowing to flow difference signal
Value threshold value, then judge whether sharing control signal reaches minimum of a value；If sharing control signal is not reaching to minimum of a value, will flow
Control signal reduces a step-length；Sharing control signal after output adjustment.
With reference to Fig. 2, the circuit also includes that adder, subtracter, current sampler, diode, output voltage reference value are sent out
Raw device, switch power controller and power supply major loop group；
Wherein, the output current signal on current sampler collection Switching Power Supply output main track, the output current signal one
Aspect enters the negative terminal of subtracter, and on the other hand into the anode of diode, the negative electrode of diode is connected on current equalizer, and this is equal
Signal on streamline is current equalizer signal, and the current equalizer signal enters the anode of subtracter, in subtracter by current equalizer signal and
Output current signal does subtraction, is flowed difference signal, into maximum streaming digital controller；
An anode of the sharing control signal that maximum equalizing controller is produced into adder, and output voltage reference value
Output voltage reference signal is supplied to generator another anode of adder, and adder is by output voltage reference signal and
After flow control signals do addition, obtain given voltage signal, and be supplied to switch power controller, switch power controller according to
Given voltage signal produces power control signal and is supplied to power supply major loop, controls the work of power supply major loop.
The maximum fluxion word control circuit of switch power parallel that the present embodiment is provided so that output current signal is less than equal
The switch power source output voltage of streamline signal increases, and so as to increase the output current value of the Switching Power Supply, and reaches and will export
The effect of the output current increase of electric current Switching Power Supply less than normal.After Switching Power Supply performs maximum sharing control, each output electricity
The output voltage in source reaches an equalization point, so as to reach the effect flowed.In addition, output electricity in all Switching Power Supplies in parallel
That maximum Switching Power Supply of stream, in the presence of maximum current-sharing control method, can reduce the output voltage of itself automatically, so as to
The voltage between output positive bus-bar and output negative busbar is reduced, the function that output voltage recovers automatically is reached.
The maximum of the auto restore facility with voltage fluxion word control circuit, simple structure, control are rapid, occupancy hard
Part resource is few, not only has and flows effect well, also avoids the problem of output voltage harmful competition, be that switch power parallel is equal
A core technology in flow control technology.
Describe as described above for a kind of embodiment and/or the feature that illustrates can be in same or similar mode at one or more
Used in multiple other embodiments, and/or combine with the feature in other embodiments or substitute the feature in other embodiments
Use.
It should be emphasized that term "comprises/comprising" refers to the presence of feature, one integral piece, step or component when using herein, but and
It is not excluded for the presence of one or more further features, one integral piece, step, component or its combination or additional.
Circuit and method more than of the invention can be realized by hardware, it is also possible to realized by combination of hardware software.The present invention
It is related to such computer-readable program, when the program is performed by logical block, the logical block can be made to realize above
Described circuit or component parts, or make the logical block realize various methods mentioned above or step.The invention further relates to
For storing the storage medium of procedure above, such as hard disk, disk, CD, DVD, flash memory etc..
The many features and advantage of these embodiments are that clearly, therefore claims are intended to according to the detailed description
Cover all these feature and advantage fallen in its true spirit and scope of these embodiments.Further, since this area
Technical staff is readily apparent that many modifications and changes, therefore is not meant to for embodiments of the invention to be limited to illustrated and description essence
Really structurally and operationally, can be to cover all suitable modifications and equivalent fallen in the range of which.
Unspecified part of the present invention is known to the skilled person technology.
Claims (5)
1. the maximum streaming digital control method of a kind of switch power parallel, it is characterised in that include：
Difference signal is flowed in inquiry；
Judge whether stream difference signal is more than and flow difference threshold；
If difference signal is flowed more than difference threshold is flowed, judge whether sharing control signal reaches maximum；
If sharing control signal is not reaching to maximum, sharing control signal is increased into a step-length；
If difference signal is flowed less than difference threshold is flowed, judge whether sharing control signal reaches minimum of a value；
If sharing control signal is not reaching to minimum of a value, sharing control signal is reduced into a step-length；
Sharing control signal after output adjustment.
2. method according to claim 1, it is characterised in that before the inquiry flows difference signal, also include；
On the one hand output current signal on the output main track of current sampler collection Switching Power Supply, the output current signal enter
The negative terminal of subtracter, on the other hand into the anode of diode, the negative electrode of diode is connected on current equalizer, on the current equalizer
Signal is current equalizer signal, and the current equalizer signal enters the anode of subtracter, by current equalizer signal and output current in subtracter
Signal does subtraction, is flowed difference signal.
3. method according to claim 1 and 2, it is characterised in that also include：
Sharing control signal enters an anode of adder, and output voltage reference signal is carried by output voltage reference value generator
Another anode of supply adder, in adder does output voltage reference signal and sharing control signal after addition, obtains
Given voltage signal, and switch power controller is supplied to, switch power controller produces power supply control according to given voltage signal
Signal processed is supplied to Switching Power Supply major loop, the work of controlling switch power supply major loop.
4. the maximum fluxion word control circuit of a kind of switch power parallel, it is characterised in that include：The control of maximum streaming digital
Device, the maximum equalizing controller inquiry flow difference signal；Judge whether stream difference signal is more than and flow difference threshold；If
Difference signal is flowed more than difference threshold is flowed, then judge whether sharing control signal reaches maximum；If sharing control signal
Maximum is not reaching to, then sharing control signal is increased into a step-length；If flowing difference signal and being less than and flow difference threshold,
Then judge whether sharing control signal reaches minimum of a value；If sharing control signal is not reaching to minimum of a value, sharing control is believed
Number reduce a step-length；Sharing control signal after output adjustment.
5. circuit according to claim 4, it is characterised in that also including adder, subtracter, current sampler, two poles
Pipe, output voltage reference value generator, switch power controller and power supply major loop group；
Wherein, the output current signal on current sampler collection Switching Power Supply output main track, the output current signal is on the one hand
Into the negative terminal of subtracter, on the other hand into the anode of diode, the negative electrode of diode is connected on current equalizer, the current equalizer
On signal be current equalizer signal, the current equalizer signal enter subtracter anode, by current equalizer signal and output in subtracter
Current signal does subtraction, is flowed difference signal, into maximum streaming digital controller；
The sharing control signal that maximum equalizing controller is produced enters an anode of adder, and output voltage reference value occurs
Output voltage reference signal is supplied to another anode of adder, adder that control is flowed by output voltage reference signal and by device
After signal processed does addition, given voltage signal is obtained, and is supplied to switch power controller, switch power controller is according to given
Voltage signal produces power control signal and is supplied to power supply major loop, controls the work of power supply major loop.
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| CN201410384713.2A CN104167921B (en) | 2014-08-07 | 2014-08-07 | Switch power parallel maximum streaming digital control method and circuit |
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| CN109768693B (en) * | 2017-11-07 | 2022-05-10 | 中兴通讯股份有限公司 | Current sharing control method, device and system and computer readable storage medium |
| CN113178914A (en) * | 2021-04-30 | 2021-07-27 | 科华数据股份有限公司 | Voltage transformation circuit control method and device and parallel operation UPS system |
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