CN102981482A - Power supply circuit and method - Google Patents
Power supply circuit and method Download PDFInfo
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- CN102981482A CN102981482A CN2012104992187A CN201210499218A CN102981482A CN 102981482 A CN102981482 A CN 102981482A CN 2012104992187 A CN2012104992187 A CN 2012104992187A CN 201210499218 A CN201210499218 A CN 201210499218A CN 102981482 A CN102981482 A CN 102981482A
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
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Abstract
The invention discloses a power supply circuit and a power supply method, and relates to the field of electronics and capable of the power supply efficiency of a power supply. The invention adopts the technical scheme as follows: when the power supply uses N branch circuits for parallel output, a sampling unit and an adjustable resistor unit are serially connected to each output branch circuit; the sampling unit acquires a branch circuit detecting signal; a control unit acquires the branch circuit detecting signal from the sampling unit, acquires a reference signal from a reference signal providing unit, and compares the detecting signal and the reference signal; when a comparison result is that the detecting signal is smaller than the reference signal, the control unit generates a control signal for reducing branch circuit resistance; when the comparison result is that the detecting signal is larger than the reference signal, the control unit generates a control signal for increasing the branch circuit resistance; and the adjustable resistor unit adjusts the branch circuit resistance according to the control signal input by the control unit till the detecting signal is equal to the reference signal. The power supply circuit and the power supply method are used for supplying power to equipment to be powered.
Description
Technical field
The present invention relates to electronic applications, relate in particular to a kind of feed circuit and method.
Background technology
Along with various electronic equipments, such as communication apparatus, raising to bandwidth and exchange capacity demand, demand to power supply also improves thereupon, therefore current communication apparatus uses single channel/two-way/multi-path distributed power supply, the distributed power supply power supply refers to, at first multiple branch circuit output in parallel of power supply is carried out multiple branch circuit again and closed the road and concentrate to treating the power-supply unit power supply.In above-mentioned power supply mode, the difference of resistance causes that each branch current distributes inequality, each branch road output voltage not to wait on each branch road, the branch road that output voltage is low not only can not close the road to treating the power-supply unit power supply, can equivalence be the load of the high branch road of output voltage on the contrary, it is uneven to cause power supply device thermal stress to distribute, even damages.Therefore the distributed power supply power supply must adopt flow equalize technology that each branch current of power supply output is equated, thereby each branch road output voltage is equated.
Usually adopt direct-current switch power supply to realize that each branch current of power supply output equates in the prior art: in the situation that does not change branch road resistance, series direct current Switching Power Supply on each branch road of power supply output, when branch current during greater than a certain threshold value, the output voltage of direct-current switch power supply reduces, and branch current is reduced; When branch current during less than a certain threshold value, the output voltage of direct-current switch power supply raises, and branch current is raise, thereby realizes that each branch current equates, output voltage equates.
State in realization in the process of each branch road current-sharing of power supply, the inventor finds that there are the following problems at least in the prior art:
The series direct current Switching Power Supply realizes each branch road current-sharing on each branch road of power supply output, because direct-current switch power supply can produce the branch road output power when realizing each branch road current-sharing and consume, thereby the output power that each branch road is closed behind the road produces larger consumption than the power supply output power, causes the power supply power supplying efficiency to reduce.
Summary of the invention
Embodiments of the invention provide a kind of feed circuit and method, can improve the power supply power supplying efficiency.
For achieving the above object, embodiments of the invention adopt following technical scheme:
First aspect present invention provides a kind of feed circuit, comprising: power supply, and described power supply connects the output branch road of N bar parallel connection, and N is the integer greater than 1, and described feed circuit also comprise:
Sampling unit, adjustable resistance unit, control module, reference signal provides the unit,
Be in series with a sampling unit and an adjustable resistance unit at each bar output branch road, the position at described adjustable resistance unit place is than the confluence of the more close N bar output of sampling unit branch road;
Described sampling unit is used for exporting to described control module from the output branch road acquisition testing signal at place and with described detection signal;
Described control module is used for providing the unit to obtain reference signal from described reference signal, and described reference signal and described detection signal is compared; When comparative result is detection signal during less than reference signal, described control module generates the control signal that reduces branch road resistance, and when comparative result is detection signal during greater than reference signal, described control module generates the control signal of rising branch road resistance; Wherein said reference signal is the mean value of the detection signal of N bar output branch road;
Described control module also is used for described control signal is inputted described adjustable resistance unit;
Described adjustable resistance unit is used for the resistance value according to described control signal adjusting self, until when described detection voltage equated with described reference voltage, described control module stopped to input described control signal to described adjustable resistance unit.
In conjunction with first aspect, in a kind of possible implementation, described feed circuit, described detection signal is for detecting voltage; Reference signal is reference voltage.
In conjunction with first aspect and above-mentioned possible implementation, in the possible implementation of another kind, described reference signal provides the unit to comprise: current equalizing bus bar, flows resistance; Described flows resistance one end connects the output terminal of detection voltage of the sampling unit of described N bar output branch road, and the other end connects described current equalizing bus bar; Described current equalizing bus bar is exported described reference voltage Vref, Vref=V1+V2+V3+...+VN/N, and V1 wherein, V2 ... VN is respectively the detection voltage on each bar output branch road.
In conjunction with first aspect and above-mentioned possible implementation, in the possible implementation of another kind, described feed circuit comprise that N reference signal provides the unit, and each reference signal provides the unit to be used for obtaining described detection voltage from the sampling unit of place branch road; The reference signal that described reference signal provides the unit also to connect other N-1 bar output branch roads provides the unit, the reference signal that the detection voltage that is used for that self is obtained sends to other N-1 bar output branch roads provides the unit, and the reference signal that receives other N-1 bar output branch roads provides the detection voltage of unit transmission, described reference signal provides the unit also to comprise computing chip, be used for to calculate N mean value that detects voltage, so as with the mean value of described N detection voltage as described reference voltage.
In conjunction with first aspect and above-mentioned possible implementation, in the possible implementation of another kind, described feed circuit, it is reference voltage source that described reference signal provides the unit, described reference voltage source provides described reference voltage.
In conjunction with first aspect and above-mentioned possible implementation, in the possible implementation of another kind, described feed circuit, described adjustable resistance unit comprises:
Be connected on the power resistor on the output branch road at place and be connected in parallel on field effect transistor on the described power resistor, the grid of described field effect transistor connects described control module, and drain electrode connects described sampling unit, and source electrode connects the confluence of described N bar output branch road;
Or
Be connected on the field effect transistor on the output branch road at place, the grid of described field effect transistor connects described control module, and drain electrode connects described sampling unit, and source electrode connects the confluence of described N bar output branch road.
In conjunction with first aspect and above-mentioned possible implementation, in the possible implementation of another kind, described sampling unit comprises the sampling resistor on the output branch road that is connected on the place, and amplifier; The output terminal of described amplifier connects described control module, and the input end of described amplifier is connected in parallel on the described sampling resistor.
Second aspect present invention provides a kind of method of supplying power to, comprising:
Described power supply connects the output branch road of N bar parallel connection;
Respectively export acquisition testing signal on the branch road at power supply; Obtain reference signal;
Described reference signal and described detection signal are compared;
When comparative result is detection signal during less than reference signal, generate the control signal that reduces branch road resistance, and according to the control signal of described reduction branch road resistance, reduce branch road resistance; When comparative result is detection signal during greater than reference signal, generate the control signal of rising branch road resistance, and according to the control signal of described rising branch road resistance, rising branch road resistance; So that the output signal of the output branch road of described N bar parallel connection equates.
In conjunction with second aspect, in a kind of possible implementation, described method of supplying power to, described detection signal is for detecting voltage; Described reference signal is reference voltage.
In conjunction with second aspect and above-mentioned possible implementation, in the possible implementation of another kind, the described reference voltage level that obtains comprises:
That obtains power supply respectively exports detection voltage Vi on the branch road;
Each branch road detects voltage and obtains reference voltage Vref by setting up current equalizing bus bar communication: Vref=V1+V2+V3+...+VN/N.
In conjunction with second aspect and above-mentioned possible implementation, in the possible implementation of another kind, described method of supplying power to, the described reference voltage that obtains also comprises:
That obtains power supply respectively exports detection voltage Vi on the branch road;
Calculate reference voltage Vref by compute chip: Vref=V1+V2+V3+...+VN/N; Each is exported between the described compute chip of branch road and sets up bus communication, in order to respectively export the mutual send and receive of the detection voltage of branch road.
In conjunction with second aspect and above-mentioned possible implementation, in the possible implementation of another kind, described method of supplying power to, the described reference voltage that obtains also comprises:
The reference voltage that is provided by reference voltage source is provided.
A kind of feed circuit and method that the embodiment of the invention provides are when power supply adopts the output of N bar branch circuit parallel connection, in each bar output branch road series connection one sampling unit and an adjustable resistance unit.Sampling unit obtains the branch road detection signal; Control module obtains the branch road detection signal from sampling unit respectively, provides the unit to obtain reference signal from reference signal, and detection signal and reference signal are compared the generation control signal; Adjustable resistance unit is regulated resistance on the branch road according to the control signal of control module input, until detection signal equates with reference signal, compared with prior art, the consumption of having avoided direct-current switch power supply when realizing each branch road current-sharing the power supply output power to be produced has improved the power supply power supplying efficiency.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is that a kind of feed circuit form synoptic diagram in the embodiment of the invention 1;
Fig. 2 is that another kind of feed circuit form synoptic diagram in the embodiment of the invention 1;
Fig. 3 is that a kind of feed circuit form synoptic diagram in the embodiment of the invention 2;
Fig. 4 forms synoptic diagram for a kind of reference signal in the embodiment of the invention 2 provides the unit;
Fig. 5 forms synoptic diagram for a kind of reference signal in the embodiment of the invention 2 provides the unit;
Fig. 6 forms synoptic diagram for a kind of reference signal in the embodiment of the invention 2 provides the unit;
Fig. 7 is that another kind of feed circuit form synoptic diagram in the embodiment of the invention 2;
Fig. 8 is a kind of method of supplying power to process flow diagram in the embodiment of the invention 3.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Embodiment 1
The embodiment of the invention provides a kind of feed circuit, as shown in Figure 1, comprising: power supply 11, and described power supply 11 connects the output branch road of N bar parallel connection, and N is the integer greater than 1, and described feed circuit also comprise:
Sampling unit 12, adjustable resistance unit 13, control module 14, reference signal provides unit 15,
Wherein, Fig. 1 is only with a dc power supply N branch circuit parallel connection output simple declaration.The number of power supply 11 and correlation parameter can be definite according to treating power-supply unit 17 actual demands, for example: it is that the 60V/48V/24V direct supply is powered that command, control, communications, and information equipment adopts one or two output voltage usually, when the direct supply that adopts two output voltages to equate is powered, two direct supplys power supply that backups each other.
Be in series with a sampling unit 12 and an adjustable resistance unit 13 at each bar output branch road, described adjustable resistance unit 13 connection control units 14, the position at described adjustable resistance unit 13 places is than the confluence 16 of sampling unit 12 near N bar output branch road;
Wherein, the N bar branch roads of power supply 11 output in parallel 16 are combined into one the tunnel and concentrate to treating power-supply unit 17 power supplies in the confluence, and each branch road output parameter of 16 places is fully equal in the confluence.For example: a certain power supply output current is that 10A, output voltage are 10 branch roads of 10V output in parallel, each branch road output current is 1A after regulating, output voltage is 10V, article 10, branch road 16 is combined into one the tunnel in the confluence, power supply output equates with power supply output after closing the road, close namely that the power supply output current is that 10A, output voltage are 10V behind the road, treat power-supply unit 17 power supplies in order to give.
Described sampling unit 12 connects described control module 14, is used for being input to described control module 14 from the output branch road acquisition testing signal at place and with described detection signal; Wherein said reference signal is the mean value of the detection signal of N bar output branch road.Concrete, detection signal can be detection voltage.
Wherein, in actual applications, when needs detect a certain branch current, usually adopt at this branch road sampling resistor of connecting, when flowing through on the sampling resistor when detecting electric current, by detecting the voltage that produces on the sampling resistor, correspondence obtains detecting current value.Need to prove: the present invention can choose resistance at the sampling resistor device of milliohm level in order to reduce in the sampling unit 12 sampling resistor to the consumption of power supply power, and each branch road sampling resistor resistance is known and equal.Carry out voltage ratio for the ease of control module 14, the voltage on the sampling resistor can be amplified and obtain detecting voltage, voltage amplification factor is determined according to actual needs.For example: 10 branch roads of a certain power supply output in parallel, choose resistance in each branch road sampling unit 12 and be the precision resistance of 5m Ω as sampling resistor, when the detection electric current of the 1st branch road upper reaches over-sampling resistance is 10A, voltage V=5m Ω * 10A=50mV on the sampling resistor that the 1st branch road sampling unit 12 collects, obtaining the 1st branch road detection voltage through 100 times of voltage amplifications is 5V, similarly, obtain each branch road and detect voltage.
Described control module 14 connects described adjustable resistance unit 13 and described reference signal provides unit 15, after control module 14 provides unit 15 to obtain reference signal from described reference signal, compare with reference to signal and detection signal: when comparative result is that detection signal is during less than reference signal, control module 14 generates the control signal that reduces branch road resistance, when comparative result is detection signal during greater than reference signal, control module 14 generates the control signal of rising branch road resistance.After described control signal inputted described adjustable resistance unit 13, adjustable resistance unit 13 can be regulated according to described control signal the resistance value of self, until described detection signal equates with described reference signal.Each branch road is concentrated to treating power-supply unit 17 power supplies after the road is closed in confluence 16.
The below is with 2 branch circuit parallel connection output of dc power supply simple declaration.For example: a certain dc power supply output voltage is 10V, is divided into the output of the 1st branch road and the 2nd branch circuit parallel connection; Each branch road sampling unit 12 acquisition testing voltage from the sampling resistor: the 1st branch road collects and detects voltage is 9V, and the 2nd branch road collects and detects voltage is 11V; Sampling unit 12 will detect the voltage correspondence and be input to control module 14, control module 14 provides unit 15 to obtain reference voltage from reference signal: the 1st branch road sampling unit 12 detects voltage with 9V and is input to the 1st branch road control module 14, the 2nd branch road sampling unit 12 detects voltage with 11V and is input to the corresponding control module 14 of the 2nd branch road control module 14, the 1 branch roads and the 2nd branch road and is 10V from the reference voltage that reference signal provides unit 15 to obtain; Control module 14 carries out each branch road detection voltage and reference voltage compares, and generate control signal according to comparative result: the 1st branch road detects voltage 9V less than reference voltage 10V, generate " reducing branch road resistance " control signal, the 2nd branch road detects voltage 11V greater than reference voltage 10V, generates " rising branch road resistance " control signal; The control signal that each branch road generates is inputted corresponding adjustable resistance unit 13, so that the resistance value of control adjustable resistance unit 13, equate with reference voltage until detect voltage: the 1st branch road adjustable resistance unit 13 reduces the 1st branch road resistance according to " reducing branch road resistance " control signal of input, until detecting voltage, the 1st branch road equates with reference voltage, the 2nd branch road adjustable resistance unit 13 equates with reference voltage until the 2nd branch road detects voltage according to " rising branch road resistance " control signal the 2nd branch road resistance that raises of input.Wherein, in " reduce branch road resistance " control signal and " rising branch road resistance " control signal, indicated the concrete numerical value of resistance rising/reduction, the size of this concrete numerical value can be according to the demand of the power supply scene of reality, and is pre-configured.
In this explanation be: another is implemented in scene in the present invention, and as shown in Figure 2, feed circuit adopt two power supplies.Power supply 111 is divided into the output of N bar branch circuit parallel connection with power supply 211, each branch road is realized after the current-sharing, 16 close the road and concentrate output in the confluence, and the feed circuit of power supply 111 and power supply 112 back up mutually, treat that power-supply unit 17 powers in order to give.
A kind of feed circuit that the embodiment of the invention provides are when power supply adopts the output of N bar branch circuit parallel connection, in each bar output branch road series connection one sampling unit and an adjustable resistance unit.Sampling unit obtains the branch road detection signal; Control module obtains the branch road detection signal from sampling unit respectively, provides the unit to obtain reference signal from reference signal, and detection signal and reference signal are compared the generation control signal; Adjustable resistance unit is regulated resistance on the branch road according to the control signal of control module input, until detection signal equates with reference signal, compared with prior art, the consumption of having avoided direct-current switch power supply when realizing each branch road current-sharing the power supply output power to be produced has improved the power supply power supplying efficiency.
Embodiment 2
The embodiment of the invention provides a kind of feed circuit, as shown in Figure 3, comprising: power supply 21, and described power supply 21 connects the output branch road of N bar parallel connection, and N is the integer greater than 1, and described feed circuit also comprise:
Sampling unit 22, adjustable resistance unit 23, control module 24, reference signal provides unit 25.Be in series with a sampling unit 22 and an adjustable resistance unit 23 at each bar output branch road, described adjustable resistance unit 23 connection control units 24, the position at described adjustable resistance unit 23 places is than the confluence 26 of sampling unit 22 near N bar output branch road.
Described sampling unit 22 connects described control module 24, is used for being input to described control module 24 from the output branch road acquisition testing signal at place and with described detection signal.
Described control module 24 connects described adjustable resistance unit 23 and described reference signal provides unit 25, be used for providing unit 25 to obtain reference signal from described reference signal, and compare with reference to signal and detection signal: when comparative result is that detection signal is during less than reference signal, control module 24 generates the control signal that reduces branch road resistance, when comparative result is detection signal during greater than reference signal, control module 24 generates the control signal of rising branch road resistance.Control module 24 is inputted described adjustable resistance unit 23 with described control signal, adjustable resistance unit 23 is regulated the resistance value of self according to control signal, until described detection signal equates that with described reference signal each branch road is concentrated to treating power-supply unit 27 power supplies after the road is closed in confluence 26.
Concrete, described detection signal can be detection voltage; Reference signal can be reference voltage.
For example: as shown in Figure 3, sampling unit 22 is comprised of the sampling resistor on the series arm and the voltage amplifier in parallel with sampling resistor; Adjustable resistance unit 23 is comprised of the power resistor and the field effect transistor in parallel with power resistor that are connected on the branch road, another kind of adjustable resistance unit 23 also can be comprised of the field effect transistor that is connected on the branch road, the grid connection control unit 24 of field effect transistor, drain electrode connects sampling unit 22, and source electrode connects confluence 26; Control module 24 is comprised of voltage comparator.
Wherein, in order to reduce sampling resistor to the consumption of power supply power, can choose resistance at the sampling resistor device of milliohm level, generally the power supply branch current is the ampere level, then the voltage on the sampling resistor is the millivolt level, detect the comparison of voltage and reference voltage for the ease of control module 24, be defined as detecting voltage after can utilizing amplifier that the voltage on the sampling resistor is amplified.In a kind of enforcement scene of the embodiment of the invention, sampling unit 22 comprises the sampling resistor on the output branch road that is connected on the place, and the voltage that gathers on the sampling resistor is defined as detecting voltage, does not namely amplify the voltage on the sampling resistor.
Wherein, adjustable resistance unit 23 is connected on the branch road after adopting field effect transistor and power resistor parallel connection, can reduce the thermal stress on the field effect transistor, improves the reliability of adjustable resistance unit 23, and the resistance adjustment function is realized by field effect transistor.The field effect transistor output characteristic curve refers to that when one timing of field effect transistor grid-voltage between source electrodes, the relation curve between drain current and the drain-source voltage roughly can be divided into: variable resistor district, saturation region, breakdown region and cut-off region.When the field effect plumber does when " variable resistor district ", the conducting resistance resistance of field effect transistor changes with the variation of grid-voltage between source electrodes, according to this characteristic, the field effect transistor that is operated in " variable resistor district " can equivalence be variohm, therefore when field effect plumber work in the adjustable resistance unit 23 when " variable resistor district ", can regulate field effect transistor conducting resistance resistance according to the control signal of control module 24 inputs, equate with reference voltage until detect voltage.
The below describes with the situation that a dc power supply has 2 branch circuit parallel connection outputs.For example: the output current of a certain dc power supply is 20A, and output voltage is 10V, is divided into the output of the 1st branch road and the 2nd branch circuit parallel connection; After amplifying, voltage on each branch road sampling unit 22 collection sampling resistor is defined as detecting voltage: take 1m Ω precision resistance as the sampling resistor explanation, the electric current that the 1st branch road flows through sampling resistor is 9A, then the magnitude of voltage on the sampling resistor is 9mV, determine that it is 9V that the 1st branch road detects voltage through 1000 times of voltage amplifiers after to voltage amplification on the sampling resistor, the electric current that the 2nd branch road flows through sampling resistor is 11A, then the magnitude of voltage on the sampling resistor is 11mV, determines that it is 11V that the 2nd branch road detects voltage through 1000 times of voltage amplifiers after to voltage amplification on the sampling resistor; Sampling unit 22 will detect voltage and be input to control module 24, and reference signal provides unit 25 to provide reference voltage for control module 24.Suppose that the reference voltage that the reference signal of the 1st branch road and the 2nd branch road provides unit 25 to provide is 10V, control module 24 provides unit 25 to obtain reference voltage from reference signal, then detect the comparison of voltage and reference voltage, and generate control signal according to comparative result.Be input as reference voltage with the voltage comparator anode, negative terminal is input as and detects voltage is example, when detecting voltage less than reference voltage, control module 24 output high level, the corresponding control signal that generates is " conducting of the field effect transistor drain-source utmost point reduces the conducting resistance resistance ", when detecting voltage greater than reference voltage, control module 24 output low levels, the corresponding control signal that generates is " the field effect transistor drain-source utmost point disconnects, rising conducting resistance resistance ".Here suppose to detect in the 1st branch road control module 24 voltage 9V less than reference voltage 10V, then generate " field effect transistor drain-source utmost point conducting; reduce the conducting resistance resistance " signal, detect voltage 11V in the 2nd branch road control module 24 greater than reference voltage 10V, then generate " the field effect transistor drain-source utmost point disconnects, rising conducting resistance resistance " signal; 23: the 1 branch road adjustable resistance unit 23 of control signal input adjustable resistance unit that each branch road is generated reduce the conducting resistance resistance of field effect transistor in the 1st branch road adjustable resistance unit 23 according to " field effect transistor drain-source utmost point conducting; reduce the conducting resistance resistance " control signal of inputting, equate with reference voltage until detect voltage, the 2nd branch road adjustable resistance unit 23 equates with reference voltage until detect voltage according to the raise conducting resistance resistance of field effect transistor in the 2nd branch road adjustable resistance unit 23 of " the field effect transistor drain-source utmost point disconnects; rising conducting resistance resistance " control signal of input.
In another situation, as shown in Figure 4, reference signal provides unit 25 to be comprised of current equalizing bus bar and flows resistance in the feed circuit, flows resistance one end connects the output terminal of the detection voltage of sampling unit 22, be used for obtaining the detection voltage of sampling unit 22 inputs, the other end connects current equalizing bus bar, is used for detecting voltage and is input to current equalizing bus bar.For example: a certain dc power supply output voltage is 10V, be divided into 4 branch circuit parallel connection outputs, each branch road sampling unit 22 collects each branch road detection voltage and is respectively: V1=9.8V, V2=10.3V, V3=10.1V, V4=9.8V, current equalizing bus bar obtains each branch road by flows resistance and detects voltage: V1=9.8V, V2=10.3V V3=10.1V, V4=9.8V, and obtains reference voltage Vref=(V1+V2+V3+V4)/4=10V.What deserves to be explained is: above-mentioned take the lossless electric power system of ideal as example, only provide the unit 25 principle of work in order to the simple declaration reference signal.
In another situation, as shown in Figure 5, reference signal provides unit 25 to be comprised of computing chip, reference signal provides unit 25 also to be connected with sampling unit 22, be used for obtaining each branch road and detect voltage and computing reference voltage, the embodiment of the invention is not done concrete restriction to computing chip, if certain software or certain chip or certain chip portfolio etc. can be finished the function of above-mentioned computing chip computing reference voltage, is the described computing chip of the embodiment of the invention.The reference signal that reference signal provides unit 25 also to connect other N-1 bar output branch roads provides unit 25, each branch road reference signal provides between the unit 25 after connection, set up bus communication, the reference signal that the detection voltage that self is obtained sends to other branch roads provides unit 25, and the reference signal that receives other branch roads detection voltage that provides unit 25 to send.For example: a certain dc power supply output voltage is 10V, be divided into 4 branch circuit parallel connection outputs, each branch road sampling unit 22 collects each branch road and detects voltage and be: V1=9.8V, V2=10.3V, V3=10.1V, V4=9.8V, the detection voltage that sampling unit 22 will collect be divided into two-way respectively input reference signal unit 25 and control module 24 are provided; With the 1st branch road obtaining of bus data communication and reference voltage is described: the 1st branch road reference signal provides unit 25 to obtain the detection voltage " V1=9.8V " of the 1st branch road sampling unit 22 inputs and by communication bus " V1=9.8V " is input to respectively the 2nd branch road reference signal unit 25 is provided, the 3rd branch road reference signal provides the reference signal of unit 25 and the 4th branch road that unit 25 is provided, meanwhile, the 1st branch road reference signal provides unit 25 to obtain the 2nd branch road by communication bus and detects voltage " V2=10.3V ", the 3rd branch road detects voltage " V3=10.1V " and the 4th branch road detects voltage " V4=9.8V "; The 1st branch road reference signal provides unit 25 to calculate the mean value Vp that 4 branch roads detect voltage, Vp=(V1+V2+V3+V4)/4=10V, and determine that detecting average voltage Vp is reference voltage Vref, i.e. Vref=Vp=10V.
Each output branch road shown in Figure 5 has a reference signal provides the unit, in the practical application, a reference signal can only be set in circuit the unit is provided, and provide in reference signal computing chip is set in the unit, receive the detection voltage of respectively exporting branch road, and calculate reference voltage, offer each output branch road.
In the another kind of situation, as shown in Figure 6, reference signal provides unit 25 to be comprised of reference voltage source, provides reference voltage by reference voltage source.The reference voltage that reference voltage source provides can be calculated according to the power supply actual conditions.For example: the output current of a certain dc power supply is 20A, and output voltage is 10V, is divided into 4 branch circuit parallel connection outputs, ideally, each branch road output current is 5A, and output voltage is 10V, determine that then the reference voltage source output current is 5A, the reference voltage of output is 10V.
In Fig. 4, Fig. 5 and the corresponding feed circuit of Fig. 6, described feed circuit comprise that N control module 24 and N reference signal provide unit 25, in the case, every an output control module of route provides control signal, and each reference signal provides the unit to provide reference signal for a control module; Can be also in the application that feed circuit arrange a control module 24 and reference signal provides 25, one control modules 24 in unit to provide control signal for N bar output branch road.Concrete, as shown in Figure 7, the embodiment of the invention provides another kind of feed circuit, comprises in these feed circuit that a control module 24 and a reference signal provide 25, one control modules in unit 24 corresponding N bar output branch roads.Reference voltage provides unit 25 to be used for obtaining the detection voltage calculating reference voltage that each branch road sampling unit 22 is inputted, and is input in the control module 24 with reference to voltage.Control module 24 obtains from each branch road sampling unit 22 respectively and detects voltage, provides unit 25 to obtain reference voltage from reference voltage; And compare the generation control signal to detecting piezoelectric voltage and reference voltage; Adjustable resistance unit 23 is regulated resistance on the branch road according to the control signal of control module 24 inputs, equates with reference voltage until detect voltage, and each branch road is concentrated to treating power-supply unit 27 power supplies after the road is closed in confluence 26.
In this explanation be: embodiment of the invention reference signal provides unit 25 all to choose mean value that each branch road detects voltage as equal flow standards, the maximal value, minimum value or a certain predetermined value that can be according to the actual requirements in another embodiment of the present invention detect voltage with each branch road are not described in detail this present embodiment here as equal flow standard.
A kind of feed circuit that the embodiment of the invention provides are when power supply adopts the output of N bar branch circuit parallel connection, in each bar output branch road series connection one sampling unit and an adjustable resistance unit.Sampling unit obtains the branch road detection signal; Control module obtains the branch road detection signal from sampling unit respectively, provides the unit to obtain reference signal from reference signal, and detection signal and reference signal are compared the generation control signal; Adjustable resistance unit is regulated resistance on the branch road according to the control signal of control module input, until detection signal equates with reference signal, compared with prior art, the consumption of having avoided direct-current switch power supply when realizing each branch road current-sharing the power supply output power to be produced has improved the power supply power supplying efficiency.
And adjustable resistance unit is connected on the branch road after adopting field effect transistor and power resistor parallel connection in the feed circuit that the embodiment of the invention provides, and can reduce the thermal stress on the field effect transistor, improves the reliability of adjustable resistance unit.
Embodiment 3
The embodiment of the invention provides a kind of method of supplying power to, as shown in Figure 8, comprising:
301, respectively export acquisition testing signal on the branch road at power supply.
Described power supply is connected with the output branch road of N bar parallel connection.
302, obtain reference signal.
303, more described detection signal and described reference signal, and according to comparative result generation control signal.
304, according to described control signal, control the resistance value on the output branch road of described N bar parallel connection, so that the output signal of the output branch road of described N bar parallel connection equates.
Concrete, when comparative result is detection signal during less than reference signal, generate the control signal that reduces branch road resistance, and according to the control signal of described reduction branch road resistance, reduce branch road resistance; When comparative result is detection signal during greater than reference signal, generate the control signal of rising branch road resistance, and according to the control signal of described rising branch road resistance, rising branch road resistance.
Further, described method of supplying power to, described detection signal is for detecting voltage; Described reference signal is reference voltage.
Further, the described reference voltage level that obtains comprises:
That obtains power supply respectively exports detection voltage Vi on the branch road;
Each branch road detects voltage and obtains reference voltage Vref by setting up current equalizing bus bar communication: Vref=V1+V2+V3+...+VN/N.
Further, the described reference voltage that obtains also comprises:
That obtains power supply respectively exports detection voltage Vi on the branch road;
Calculate reference voltage Vref by compute chip: Vref=V1+V2+V3+...+VN/N; Each is exported between the described compute chip of branch road and sets up bus communication, in order to respectively export the mutual send and receive of the detection voltage of branch road.
Further, the described reference voltage that obtains also comprises:
The reference voltage that is provided by reference voltage source is provided.
Need to prove, in the embodiment of the invention 3 specific descriptions of part steps can reference example 1 and embodiment 2 in corresponding content, the embodiment of the invention will repeat no more here.
A kind of method of supplying power to that the embodiment of the invention provides when power supply adopts the output of N bar branch circuit parallel connection, obtains detection signal and obtains reference signal at each bar output branch road; Detection signal and reference signal are compared the generation control signal; When comparative result is detection signal during less than reference signal, generate the control signal that reduces branch road resistance, and according to the control signal of described reduction branch road resistance, reduce branch road resistance; When comparative result is detection signal during greater than reference signal, generate the control signal of rising branch road resistance, and according to the control signal of described rising branch road resistance, rising branch road resistance.By the adjustment to the branch road resistance, so that detection signal equates that with reference signal compared with prior art, the consumption of having avoided direct-current switch power supply when realizing each branch road current-sharing the power supply output power to be produced has improved the power supply power supplying efficiency.
Through the above description of the embodiments, the those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential common hardware, can certainly pass through hardware, but the former is better embodiment in a lot of situation.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium that can read, floppy disk such as computing machine, hard disk or CD etc., comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
The above; be the specific embodiment of the present invention only, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (13)
1. feed circuit, described feed circuit comprise: power supply, described power supply connects the output branch road of N bar parallel connection, and N is the integer greater than 1, it is characterized in that, and described feed circuit also comprise:
Sampling unit, adjustable resistance unit, control module, reference signal provides the unit,
Be in series with a sampling unit and an adjustable resistance unit at each bar output branch road, the position at described adjustable resistance unit place is than the confluence of the more close N bar output of sampling unit branch road;
Described sampling unit is used for exporting to described control module from the output branch road acquisition testing signal at place and with described detection signal;
Described control module is used for providing the unit to obtain reference signal from described reference signal, and described reference signal and described detection signal is compared; When comparative result is detection signal during less than reference signal, described control module generates the control signal that reduces branch road resistance, and when comparative result is detection signal during greater than reference signal, described control module generates the control signal of rising branch road resistance; Wherein said reference signal is the mean value of the detection signal of N bar output branch road;
Described control module also is used for described control signal is inputted described adjustable resistance unit;
Described adjustable resistance unit is used for the resistance value according to described control signal adjusting self, until when described detection voltage equated with described reference voltage, described control module stopped to input described control signal to described adjustable resistance unit.
2. feed circuit according to claim 1 is characterized in that, described detection signal is for detecting voltage; Reference signal is reference voltage.
3. feed circuit according to claim 2 is characterized in that, described reference signal provides the unit to comprise: current equalizing bus bar, flows resistance; Described flows resistance one end connects the output terminal of detection voltage of the sampling unit of described N bar output branch road, and the other end connects described current equalizing bus bar; Described current equalizing bus bar is exported described reference voltage Vref, Vref=V1+V2+V3+...+VN/N, and V1 wherein, V2 ... VN is respectively the detection voltage on each bar output branch road.
4. feed circuit according to claim 2 is characterized in that, described feed circuit comprise that N reference signal provides the unit, and each reference signal provides the unit to be used for obtaining described detection voltage from the sampling unit of place branch road; The reference signal that described reference signal provides the unit also to connect other N-1 bar output branch roads provides the unit, the reference signal that the detection voltage that is used for that self is obtained sends to other N-1 bar output branch roads provides the unit, and the reference signal that receives other N-1 bar output branch roads provides the detection voltage of unit transmission, described reference signal provides the unit also to comprise computing chip, be used for to calculate N mean value that detects voltage, so as with the mean value of described N detection voltage as described reference voltage.
5. feed circuit according to claim 2 is characterized in that, described feed circuit comprise that a reference signal provides the unit, and described reference signal provides the unit to be used for obtaining N from N sampling unit of described feed circuit and detects voltage; Described reference signal provides the unit also to comprise computing chip, be used for to calculate N mean value that detects voltage, so as with the mean value of described N detection voltage as described reference voltage.
6. feed circuit according to claim 2 is characterized in that, it is reference voltage source that described reference signal provides the unit, and described reference voltage source provides described reference voltage.
7. feed circuit according to claim 2 is characterized in that, described adjustable resistance unit comprises:
Be connected on the power resistor on the output branch road at place and be connected in parallel on field effect transistor on the described power resistor, the grid of described field effect transistor connects described control module, and drain electrode connects described sampling unit, and source electrode connects the confluence of described N bar output branch road;
Or
Be connected on the field effect transistor on the output branch road at place, the grid of described field effect transistor connects described control module, and drain electrode connects described sampling unit, and source electrode connects the confluence of described N bar output branch road.
8. feed circuit according to claim 2 is characterized in that, described sampling unit comprises the sampling resistor on the output branch road that is connected on the place, and amplifier; The output terminal of described amplifier connects described control module, and the input end of described amplifier is connected in parallel on the described sampling resistor.
9. a method of supplying power to is characterized in that, comprising:
Described power supply connects the output branch road of N bar parallel connection;
Respectively export acquisition testing signal on the branch road at power supply; Obtain reference signal; Wherein said reference signal is the mean value of the detection signal of N bar output branch road;
Described reference signal and described detection signal are compared;
When comparative result is detection signal during less than reference signal, generate the control signal that reduces branch road resistance, and according to the control signal of described reduction branch road resistance, reduce branch road resistance; When comparative result is detection signal during greater than reference signal, generate the control signal of rising branch road resistance, and according to the control signal of described rising branch road resistance, rising branch road resistance; So that the output signal of the output branch road of described N bar parallel connection equates.
10. method of supplying power to according to claim 9 is characterized in that, described detection signal is for detecting voltage; Described reference signal is reference voltage.
11. method of supplying power to according to claim 10 is characterized in that, the described reference voltage level that obtains comprises:
That obtains power supply respectively exports detection voltage Vi on the branch road;
Each branch road detects voltage and obtains reference voltage Vref by setting up current equalizing bus bar communication: Vref=V1+V2+V3+...+VN/N.
12. method of supplying power to according to claim 10 is characterized in that, the described reference voltage that obtains also comprises:
That obtains power supply respectively exports detection voltage Vi on the branch road;
Calculate reference voltage Vref by compute chip: Vref=V1+V2+V3+...+VN/N; Each is exported between the described compute chip of branch road and sets up bus communication, in order to respectively export the mutual send and receive of the detection voltage of branch road.
13. method of supplying power to according to claim 10 is characterized in that, the described reference voltage that obtains also comprises:
The reference voltage that is provided by reference voltage source is provided.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210499218.7A CN102981482B (en) | 2012-11-29 | 2012-11-29 | Power supply circuit and method |
| PCT/CN2013/075561 WO2014082427A1 (en) | 2012-11-29 | 2013-05-13 | Power supply circuit and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210499218.7A CN102981482B (en) | 2012-11-29 | 2012-11-29 | Power supply circuit and method |
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| CN102981482A true CN102981482A (en) | 2013-03-20 |
| CN102981482B CN102981482B (en) | 2015-01-21 |
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| CN201210499218.7A Active CN102981482B (en) | 2012-11-29 | 2012-11-29 | Power supply circuit and method |
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| WO (1) | WO2014082427A1 (en) |
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| CN102981482B (en) | 2015-01-21 |
| WO2014082427A1 (en) | 2014-06-05 |
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Effective date of registration: 20200714 Address after: 518000 Baoan District Xin'an street, Shenzhen, Guangdong, No. 625, No. 625, Nuo platinum Plaza, Patentee after: SHENZHEN SHANGGE INTELLECTUAL PROPERTY SERVICE Co.,Ltd. Address before: 518129 Bantian HUAWEI headquarters office building, Longgang District, Guangdong, Shenzhen Patentee before: HUAWEI TECHNOLOGIES Co.,Ltd. Effective date of registration: 20200714 Address after: 315000 Room 716, Building C4, Lane 299, Guanghua Road, Ningbo High-tech Zone, Zhejiang Province Patentee after: NINGBO JIETI EDUCATION TECHNOLOGY Co.,Ltd. Address before: 518000 Baoan District Xin'an street, Shenzhen, Guangdong, No. 625, No. 625, Nuo platinum Plaza, Patentee before: SHENZHEN SHANGGE INTELLECTUAL PROPERTY SERVICE Co.,Ltd. |