CN201690362U - Flow equalizing circuit for parallel connection of power supplies - Google Patents
Flow equalizing circuit for parallel connection of power supplies Download PDFInfo
- Publication number
- CN201690362U CN201690362U CN2009202604250U CN200920260425U CN201690362U CN 201690362 U CN201690362 U CN 201690362U CN 2009202604250 U CN2009202604250 U CN 2009202604250U CN 200920260425 U CN200920260425 U CN 200920260425U CN 201690362 U CN201690362 U CN 201690362U
- Authority
- CN
- China
- Prior art keywords
- circuit
- power supply
- output
- resistance
- sampled voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Control Of Voltage And Current In General (AREA)
Abstract
The utility model relates to a flow equalizing circuit for parallel connection of power supplies, which is used for realizing flow equalization among the power supplies connected in parallel. The flow equalizing circuit for parallel connection of the power supplies comprises a first sampling circuit, a second sampling circuit, a comparison circuit and a regulating circuit. The first sampling circuit and the second sampling circuit respectively collect the output current of a reference power supply and a regulating power supply, and convert the output current into sampling voltage. The comparison circuit compares the sampling voltage of the first sampling circuit and the second sampling circuit and generates control signals. The regulating circuit is connected on the circuit at the output end of the regulating power supply, and regulates the output current of the regulating power supply according to the control signals, thus realizing flow equalization among the power supplies connected in parallel; furthermore, the power supplies connected in parallel do not need any buses for connection, thus having high flow equaling precision. The flow equalizing circuit can also be used for parallel flow equalization among multiple power supplies or multiple paths of output power supplies, and only need of the corresponding adding of the flow equalizing circuit on the added power supply output end, therefore, the use is more convenient and simpler.
Description
Technical field
The utility model relates to power technique fields, particularly a kind of circuit of realizing the power supply parallel current-sharing.
Background technology
At present, owing to reasons such as semiconductor power device, magnetic materials, the peak power output of single switch power module has only several kilowatts, is system's power supply but often need the Switching Power Supply more than the hundreds of kilowatt in actual applications, for example jumbo program controlled switching system.Therefore, need realize by the parallel running of power module.In order to make each power supply effectively, balancedly use, also need to increase flow equalizing circuit.Existing flow equalize technology has two kinds, and a kind of is to utilize the current-sharing chip, and the current signal of each power supply of sampling also compares, and adjusts the PWM duty ratio according to comparative result, thereby changes the output voltage of each power supply, to reach the purpose of current-sharing; Another kind is to use scm software control, monitors the operating state of each power supply in real time, and the output current by each power supply of software control again is to reach the purpose of current-sharing.
But, when utilizing the current-sharing chip, need current equalizing bus bar to connect between each power supply, and can't realize the multiple power supplies current-sharing, the control circuit complexity, the cost of chip is also high.And during scm software, because reasons such as the response speed of software is slow, poor anti jamming capability often do not reach good current-sharing effect, cost is also very high.
The utility model content
The purpose of this utility model provides a kind of power supply parallel current-sharing circuit, is used to realize the current-sharing between the parallel connection power supply, comprises first power supply, second source and output general supply.
Wherein, the utility model power supply parallel current-sharing circuit also comprises:
Sample first sample circuit of first sampled voltage of first power supply;
Second sample circuit of second sampled voltage of sampling second source;
First sampled voltage and second sampled voltage are compared, and produce the comparison circuit of control signal according to comparative result;
The regulating circuit that the control signal that produces according to comparison circuit is adjusted the output current of first power supply;
Regulate the output voltage of second source, guarantee the secondary voltage stabilizing circuit that regulating circuit can normal regulating first electric power outputting current;
Above-mentioned first power supply connects first sample circuit, and first sample circuit also connects described comparison circuit and secondary voltage stabilizing circuit respectively; Above-mentioned second source connects second sample circuit, and second sample circuit also connects above-mentioned regulating circuit and comparison circuit respectively; Above-mentioned output general supply connects described regulating circuit and secondary voltage stabilizing circuit.
Preferably, above-mentioned first sample circuit comprises: the resistance R 1 and first differential amplifier, and an end of resistance R 1 can be connected with the output of first power supply, and the other end can be connected with regulating circuit; Two signal input parts of first differential amplifier can be connected with the two ends of resistance R 1, produce above-mentioned first sampled voltage, and the signal output part of first differential amplifier is connected with comparison circuit;
Above-mentioned second sample circuit comprises: the resistance R 2 and second differential amplifier, and an end of resistance R 2 and the output of second source, the other end connect above-mentioned secondary voltage stabilizing circuit; Two signal input parts of second differential amplifier are connected with the two ends of resistance R 2, produce above-mentioned second sampled voltage, and the signal output part of second differential amplifier is connected with comparison circuit.
Preferably, above-mentioned comparison circuit comprises comparator and the switching device that is connected with comparator, and comparator is first sampled voltage and second sampled voltage relatively, and outputs level signals, the conduction and cut-off of control switch device.
Preferably, above-mentioned regulating circuit comprises field effect transistor, and the grid of this field effect transistor is connected with described switching device, and drain electrode is connected with the output of first power supply, and source electrode is connected with output general supply and secondary voltage stabilizing circuit respectively; Field effect transistor is according to the conducting of above-mentioned switching device or end, and regulates the output current of first power supply.
Preferably, above-mentioned comparator is a reference voltage with second sampled voltage, when first sampled voltage greater than second sampled voltage, comparator output high level, but switching device conducting, the grid voltage of field effect transistor reduces, and then the pressure drop between the source of field effect transistor, the drain electrode can increase, and the output current of first power supply will reduce; When first sampled voltage less than second sampled voltage, the comparator output low level, switching device can end, the grid voltage of field effect transistor raises, then the pressure drop between the source of field effect transistor, the drain electrode can reduce, the output current of first power supply will increase.
Preferably, above-mentioned power supply parallel current-sharing circuit comprises that also a plurality of power supplys are in parallel with first power supply and second source, corresponding sample circuit, comparison circuit and the regulating circuit of connecting of the output of each power supply.
The utility model also provides another kind of power supply parallel current-sharing circuit, comprises first power supply, second source and output general supply.
Wherein, the utility model power supply parallel current-sharing circuit also comprises:
Sample first sample circuit of first sampled voltage of first power supply; Second sample circuit of second sampled voltage of sampling second source; The 3rd sample circuit of the 3rd sampled voltage of sampling output general supply;
First sampled voltage and the 3rd sampled voltage are compared, and produce first comparison circuit of control signal according to comparative result; Second sampled voltage and the 3rd sampled voltage are compared, and produce second comparison circuit of control signal according to comparative result;
First regulating circuit of the output current of first power supply being adjusted according to the control signal of first comparison circuit; Second regulating circuit of the output current of second source being adjusted according to the control signal of second comparison circuit;
Above-mentioned first power supply connects first sample circuit, and first sample circuit also connects described first comparison circuit and first regulating circuit respectively; Above-mentioned second source connects second sample circuit, and second sample circuit also connects above-mentioned second comparison circuit and second regulating circuit respectively; Above-mentioned first regulating circuit also is connected with first comparison circuit and the 3rd sample circuit, and second regulating circuit also is connected with second comparison circuit and the 3rd sample circuit; Above-mentioned output general supply is connected with the 3rd sample circuit, and the 3rd sample circuit also is connected with first comparison circuit and second comparison circuit respectively.
Preferably, above-mentioned first sample circuit comprises: the resistance R 2 and first differential amplifier, and an end of resistance R 2 connects the output of first power supply, and the other end connects regulating circuit; Two signal input parts of first differential amplifier are connected with the two ends of resistance R 2, produce above-mentioned first sampled voltage, and the signal output part of first differential amplifier is connected with first comparison circuit;
Above-mentioned second sample circuit comprises: the resistance R 17 and second differential amplifier, and an end of resistance R 17 connects the output of second source, and the other end connects regulating circuit; Two signal input parts of second differential amplifier are connected with the two ends of resistance R 17, can produce above-mentioned second sampled voltage, and the signal output part of second differential amplifier is connected with second comparison circuit;
Above-mentioned the 3rd sample circuit comprises: resistance R 18 and the 3rd differential amplifier, and an end of resistance R 18 is connected with first regulating circuit and second regulating circuit, and the other end is connected with the output general supply; Two signal input parts of the 3rd differential amplifier are connected with the two ends of resistance R 18, can produce above-mentioned the 3rd sampled voltage, and the signal output part of the 3rd differential amplifier is connected with first comparison circuit and second comparison circuit respectively.
Preferably, above-mentioned power supply parallel current-sharing circuit comprises that also a plurality of power supplys are in parallel with first power supply and second source, corresponding sample circuit, comparison circuit and the regulating circuit of connecting of the output of each power supply.
The utility model power supply parallel current-sharing circuit passes through the parallel current-sharing between simple sample circuit, comparison circuit and the regulating circuit realization power supply, and connects without any need for bus between the parallel connection power supply.In addition, the utility model power supply flow equalizing circuit can also be realized the parallel current-sharing between many power supplys or the multiple-output electric power, only needs to get final product at corresponding this power supply parallel current-sharing circuit that increases of the power output end that increases, and is convenient and simple, current-sharing precision height.
Description of drawings
Fig. 1 is the structural representation of power supply parallel current-sharing circuit among the utility model first embodiment;
Fig. 2 is the electrical block diagram of power supply parallel current-sharing circuit in the execution mode of the foregoing description;
Fig. 3 is the structural representation of power supply parallel current-sharing circuit among the utility model second embodiment;
Fig. 4 is the electrical block diagram of power supply parallel current-sharing circuit in the execution mode of the foregoing description;
Fig. 5 be optimize in the foregoing description the electrical block diagram of high impedance differential amplifier.
The realization of the utility model purpose, functional characteristics and advantage will be in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
With reference to Fig. 1, be the power supply flow equalizing circuit structured flowchart of first embodiment proposition of the present utility model.This power supply flow equalizing circuit is used to realize the current-sharing between the parallel connection power supply, comprises first, second power supply V ' and V ", output general supply V, first, second sample circuit 11 and 12, comparison circuit 20, regulating circuit 30 and secondary voltage stabilizing circuit 40.The first power supply V ' is connected with first sample circuit 11, and first sample circuit 11 also connects regulating circuit 30 and comparison circuit 20 respectively.Second source V " be connected with second sample circuit 12, second sample circuit 12 also connects comparison circuit 20 and secondary voltage stabilizing circuit 40 respectively.Output general supply V connects regulating circuit 30 and secondary voltage stabilizing circuit 40.
In specific implementation process, can define second source V " be reference power supply, the first power supply V ' is for regulating power supply.First sample circuit 11 is used for gathering first sampled voltage of the first power supply V ', comprises the resistance R 1 and first differential amplifier 111.One end of resistance R 1 is connected with the output of the first power supply V ', and the other end is connected with regulating circuit 30.Two signal input parts of first differential amplifier 111 are connected with the two ends of resistance R 1, gather the voltage at resistance R 1 two ends, form above-mentioned first sampled voltage, and signal output part is connected with comparison circuit 20.Second sample circuit 12 is used for gathering second source V " second sampled voltage, comprise the resistance R 2 and second differential amplifier 121.One end of resistance R 2 and second source V " output be connected, the other end is connected with secondary voltage stabilizing circuit 40.Two signal input parts of second differential amplifier 121 are connected with the two ends of resistance R 2 respectively, can gather the voltage at resistance R 2 two ends, form above-mentioned second sampled voltage, and signal output part is connected with comparison circuit 20.
In order to guarantee the first power supply V ' and second source V " the load current of output equate; when the resistance value ratio of resistance R 1 and resistance R 2 is K1; when the ratio of the multiplication factor of first differential amplifier 111 and second differential amplifier 121 is K2, K1 must be inversely proportional to K2 (being K1=1/K2).Preferably, first differential amplifier 111 equates that with the multiplication factor of second differential amplifier 121 resistance R 1 also equates with the resistance of resistance R 2.And in order not influence the first power supply V ' and second source V as far as possible " load consumption and power-efficient, so the resistance of resistance R 1 and resistance R 2 can not be excessive.
With reference to Fig. 2, above-mentioned first differential amplifier 111 comprises operational amplifier U1-A and resistance R 3, resistance R 6, resistance R 7, resistance R 8.Wherein, the two ends of above-mentioned resistance R 1 are connected with resistance R 3 and resistance R 6 respectively, and the other end of resistance R 3 is connected with the positive input terminal of operational amplifier U1-A, and the other end of resistance R 6 is connected with the negative input end of operational amplifier U1-A.The two ends of resistance R 7 are connected with negative input end and the output of operational amplifier U1-A respectively.One end of resistance R 8 is connected other end ground connection with the positive input terminal of operational amplifier U1-A.Above-mentioned second differential amplifier 121 comprises operational amplifier U1-B and resistance R 4, resistance R 5, resistance R 9, resistance R 10.The two ends of above-mentioned resistance R 2 are connected with resistance R 4 and resistance R 5 respectively, and the other end of resistance R 4 is connected with the negative input end of operational amplifier U1-B, and the other end of resistance R 5 is connected with the positive input terminal of operational amplifier U1-B.The two ends of resistance R 9 are connected with negative input end and the output of operational amplifier U1-B respectively.One end of resistance R 10 is connected other end ground connection with the positive input terminal of operational amplifier U1-B.
Above-mentioned comparison circuit 20 comprises comparator U1-C, switching device Q2, resistance R 11, resistance R 12, resistance R 13, resistance R 14 and capacitor C 1.Resistance R 11 and resistance R 12 difference are the current-limiting resistance of the input of device U1-C as a comparison.One end of resistance R 11 connects the output of above-mentioned first differential amplifier 111, and the other end connects the positive input terminal of comparator U1-C.One end of resistance R 12 connects the output of above-mentioned second differential amplifier 121, and the other end connects the negative input end of comparator U1-C.One end of resistance R 13 connects the output of comparator U1-C, and the other end connects the base stage of switching device Q2.The two ends of resistance R 14 connect base stage and the emitter of switching device Q2 respectively, and the anode of capacitor C 1 connects the collector electrode of switching device Q2, and negative terminal is connected altogether with the emitter of switching device Q2.Comparator U1-C is first sampled voltage and second sampled voltage relatively, produces level signal, the conduction and cut-off of control switch device Q2.For example, be reference voltage with second sampled voltage, when first sampled voltage during greater than second sampled voltage, comparator U1-C exports high level signal, then switching device Q2 conducting; When first sampled voltage less than second sampled voltage, comparator U1-C output low level signal, then switching device Q2 ends.
Above-mentioned regulating circuit 30 comprises field effect transistor Q1, driving power VCC2, resistance R 15 and protection voltage-stabiliser tube ZD1.The grid of field effect transistor Q1 is connected with switching device Q2 in the above-mentioned comparison circuit 20, and drain electrode is connected with the output of above-mentioned resistance R 1, and source electrode connects secondary voltage stabilizing circuit 40 and output general supply V respectively.Driving power VCC2 is connected with the grid of field effect transistor Q1, as the driving power of field effect transistor Q1.Resistance R 15 is serially connected between the grid of driving power VCC2 and field effect transistor Q1.The end of protection voltage-stabiliser tube ZD1 is connected with the grid of field effect transistor Q1, and the other end is connected with the drain electrode of field effect transistor Q1.Pressure drop between the source of field effect transistor Q1, the drain electrode will change along with the change in voltage on the grid, thereby regulate the output current of the first power supply V '.For example, when switching device Q2 conducting, then the voltage that is carried on the grid of field effect transistor Q1 of driving power VCC2 will reduce, and then the pressure drop between the source of field effect transistor Q1, the drain electrode raises, and the electric current that flows through field effect transistor Q1 can reduce, thereby reduces by the output current of the first power supply V '.Through the adjustment repeatedly of regulating circuit 30, can realize the first power supply V ' and second source V " current-sharing.Q2 ends when switching device, then the voltage that is carried on the grid of field effect transistor Q1 of driving power VCC2 raises, then the pressure drop between the source of field effect transistor Q1, the drain electrode will reduce, and the electric current that flows through field effect transistor Q1 can raise, thus the output current of the first power supply V ' that raises.Through the adjustment repeatedly of regulating circuit 30, can realize the first power supply V ' and second source V " current-sharing.
Be understandable that the adjusting of above-mentioned field effect transistor Q1 two ends pressure drop is at the forward conduction of field effect transistor Q1 and is on the basis of magnifying state and realizes.So, in the circuit of present embodiment, second source V " output circuit must connect secondary voltage stabilizing circuit 40; be used for reducing second source V " output voltage, make in the process of regulating the first power supply V ' output current, the drain voltage of field field effect transistor Q1 is higher than the source voltage of field effect transistor Q1 all the time, thereby the two ends pressure drop forward that guarantees field effect transistor Q1 is adjustable.
Above-mentioned comparison circuit 20 also comprises the capacitance-resistance networking.This resistance-capacitance network is composed in series by resistance R 16 and capacitor C 3, and its two ends are connected with the positive input terminal of comparator U1-C and the collector electrode of switching device Q2 respectively.
The power supply flow equalizing circuit of the foregoing description, can also comprise a plurality of power supplys and the first power supply V ' and second source V " in parallel; and corresponding sample circuit, comparison circuit and the regulating circuit of connecting of the output of each power supply, then can realize the parallel current-sharing between many power supplys or the multiple-output electric power.
The utility model power supply flow equalizing circuit is realized parallel current-sharing between first power supply and the second source by simple sample circuit, comparison circuit and regulating circuit, and first be connected without any need for bus between power supply and the second source, circuit structure is simple, and current-sharing precision height.In addition, the utility model power supply flow equalizing circuit can also be realized the parallel current-sharing between many power supplys or the multiple-output electric power, only needs to get final product at corresponding this power supply flow equalizing circuit that increases of the power output end that increases, and uses convenient.
On the basis of the circuit theory of the foregoing description, the power supply parallel current-sharing circuit of second embodiment has been proposed.With reference to Fig. 3, this power supply flow equalizing circuit is used to realize the current-sharing of the output current of first power supply and second source parallel connection, comprise first, second power supply V ' and V "; output general supply V; first, second, third sample circuit 51,52 and 53; first, second comparison circuit 61 and 62, first, second regulating circuit 71 and 72.The first power supply V ' is connected with first sample circuit 51, and first sample circuit 51 also connects first regulating circuit 71 and first comparison circuit 61 respectively.Second source V " connect second sample circuit, 52, the second sample circuits 52 and also connect second regulating circuit 72 and second comparison circuit 62 respectively.First regulating circuit 71 also is connected with first comparison circuit 61 and the 3rd sample circuit 53, and second regulating circuit 72 also is connected with second comparison circuit 62 and the 3rd sample circuit 53.Output general supply V is connected with the 3rd sample circuit 53, and the 3rd sample circuit 53 also connects first comparison circuit 61 and second comparison circuit 62 respectively.
In specific implementation process, can define output general supply V is reference power supply, the first power supply V ' and second source V " for regulating power supply.First sample circuit 51 is used for gathering first sampled voltage of the first power supply V ', comprises the resistance R 2 and first differential amplifier 511.One end of resistance R 2 connects the output of the first power supply V ', and the other end connects first regulating circuit 71.Two signal input parts of first differential amplifier 511 are connected with the two ends of resistance R 2, gather the voltage at resistance R 2 two ends, form first sampled voltage, and signal output part is connected with first comparison circuit 61.Second sample circuit 52 comprises the resistance R 17 and second differential amplifier 521.One end of resistance R 17 connects second source V " output, the other end connects second regulating circuit 72.Two signal input parts of second differential amplifier 521 are connected with the two ends of second resistance R 17, gather the voltage at resistance R 17 two ends, form second sampled voltage, and signal output part is connected with second comparison circuit 62.The 3rd sample circuit 53 comprises resistance R 18 and the 3rd differential amplifier 531.One end of resistance R 18 is connected with first regulating circuit 71 and second regulating circuit 72, and the other end connects output general supply V.Two signal input parts of the 3rd differential amplifier 531 are connected with the two ends of resistance R 18, gather the voltage at resistance R 18 two ends, form the 3rd sampled voltage, and signal output part is connected with first comparison circuit 61 and second comparison circuit 62 respectively.
Above-mentioned first comparison circuit 61 is used for first sampled voltage and the 3rd sampled voltage are compared, and can produce control signal corresponding according to comparative result.Above-mentioned second comparison circuit 62 is used for second sampled voltage and the 3rd sampled voltage are compared, and can produce control signal corresponding according to comparative result.Wherein first, second comparison circuit 61 and 62 all with the 3rd sampled voltage as reference voltage.Two signal input parts of first comparison circuit 61 are connected with the signal output part of first differential amplifier 511 and the signal output part of the 3rd differential amplifier 531, and the signal output part of first comparison circuit 61 is connected with first regulating circuit 71.First regulating circuit 71 can be adjusted the output current of the first power supply V ' according to the control signal of first comparison circuit 61.Two signal input parts of second comparison circuit 62 are connected with the signal output part of second differential amplifier 521 and the signal output part of the 3rd differential amplifier 531, and the signal output part of second comparison circuit 61 is connected with second regulating circuit 72.Second regulating circuit 72 can be according to the control signal of second comparison circuit 62, to second source V " output current adjust.
With reference to Fig. 4, the circuit structure of above-mentioned first comparison circuit 61 and second comparison circuit 62 is consistent with the circuit structure of the comparison circuit 20 of first embodiment, does not repeat them here.The circuit structure of first regulating circuit 71 and second regulating circuit 72 is consistent with the circuit structure of the regulating circuit 30 of first embodiment.Just repeat no more at this.
The output current of above-mentioned output general supply V is the first power supply V ' and second source V " summation; in order to guarantee the first power supply V ' and second source V " the load current of output equate, preferably, first differential amplifier 511, second differential amplifier 521 equate that with the multiplication factor of the 3rd differential amplifier 531 resistance of resistance R 2, resistance R 17 is the twice of the resistance of resistance R 18.
The power supply flow equalizing circuit of the foregoing description, can also comprise a plurality of power supplys and the first power supply V ' and second source V " in parallel; and corresponding sample circuit, comparison circuit and the regulating circuit of connecting of the output of each power supply, then can realize the parallel current-sharing between many power supplys or the multiple-output electric power.
The utility model power supply parallel current-sharing circuit is simple, forms the development time and the development cost of having saved the current-sharing chip by electronic component cheaply.And this power supply flow equalizing circuit can be realized the multiple-output electric power parallel current-sharing.When needs are realized the parallel current-sharing of multiple-output electric power, only need to connect the parallel current-sharing that sample circuit, comparison circuit and regulating circuit just can be realized multiple-output electric power at the power output end that increases, use convenient.
Differential amplifier among above-mentioned first embodiment and second embodiment can also be high impedance differential amplifier as shown in Figure 5 except common differential amplifier, this high impedance differential amplifier makes that the power supply current-sharing is more accurate.
Power supply parallel current-sharing circuit also can be integrated on the circuit board among above-mentioned first embodiment and second embodiment, when needs are realized the parallel current-sharing of many power supplys, only need behind power module, to connect this circuit board and can realize current-sharing, make when the user uses convenient, fastly, and be easy to realize power standardization.
The above only is a preferred embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure transformation that utilizes the utility model specification and accompanying drawing content to be done; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.
Claims (9)
1. power supply parallel current-sharing circuit is used to realize the current-sharing between the parallel connection power supply, comprises first power supply, second source and output general supply, it is characterized in that, also comprises:
Sample first sample circuit of first sampled voltage of first power supply;
Second sample circuit of second sampled voltage of sampling second source;
First sampled voltage and second sampled voltage are compared, and produce the comparison circuit of control signal according to comparative result;
The regulating circuit that the control signal that produces according to comparison circuit is adjusted the output current of first power supply;
Regulate the output voltage of second source, guarantee the secondary voltage stabilizing circuit that regulating circuit can normal regulating first electric power outputting current;
Described first power supply connects first sample circuit, and described first sample circuit also connects described regulating circuit and comparison circuit respectively; Described second source connects second sample circuit, and described second sample circuit also connects described comparison circuit and secondary voltage stabilizing circuit respectively; Described output general supply connects described regulating circuit and secondary voltage stabilizing circuit.
2. power supply parallel current-sharing circuit as claimed in claim 1 is characterized in that, described first sample circuit comprises: the resistance R 1 and first differential amplifier, and an end of resistance R 1 is connected with the output of first power supply, and the other end is connected with regulating circuit; Two signal input parts of first differential amplifier are connected with the two ends of resistance R 1, produce described first sampled voltage, and the signal output part of first differential amplifier is connected with described comparison circuit;
Described second sample circuit comprises: the resistance R 2 and second differential amplifier, and an end of resistance R 2 is connected with the output of second source, and the other end connects described secondary voltage stabilizing circuit; Two signal input parts of second differential amplifier are connected with the two ends of resistance R 2, produce described second sampled voltage, and the signal output part of second differential amplifier is connected with described comparison circuit.
3. power supply parallel current-sharing circuit as claimed in claim 2, it is characterized in that described comparison circuit comprises comparator and the switching device that is connected with comparator, comparator is first sampled voltage and second sampled voltage relatively, and outputs level signals, the conduction and cut-off of control switch device.
4. power supply parallel current-sharing circuit as claimed in claim 3, it is characterized in that described regulating circuit comprises field effect transistor, the grid of this field effect transistor is connected with described switching device, drain electrode is connected with the output of first power supply, and source electrode is connected with output general supply and secondary voltage stabilizing circuit respectively; Field effect transistor is according to the conducting of described switching device or end, and regulates the output current of first power supply.
5. as power supply parallel current-sharing circuit as described in the claim 4, it is characterized in that, described comparator is a reference voltage with second sampled voltage, when first sampled voltage greater than second sampled voltage, comparator output high level, the switching device conducting, the grid voltage of field effect transistor reduces, then the pressure drop between the source of field effect transistor, the drain electrode increases, and the output current of first power supply will reduce; When first sampled voltage less than second sampled voltage, the comparator output low level, switching device ends, the grid voltage of field effect transistor raises, then the pressure drop between the source of field effect transistor, the drain electrode reduces, the output current of first power supply will increase.
6. as each described power supply parallel current-sharing circuit in the claim 1 to 5, it is characterized in that, comprise that also a plurality of power supplys are in parallel with first power supply and second source, corresponding sample circuit, comparison circuit and the regulating circuit of connecting of the output of each power supply.
7. power supply parallel current-sharing circuit is used to realize the current-sharing between the parallel connection power supply, comprises first power supply, second source and output general supply, it is characterized in that, also comprises:
Sample first sample circuit of first sampled voltage of first power supply; Second sample circuit of second sampled voltage of sampling second source; The 3rd sample circuit of the 3rd sampled voltage of sampling output general supply;
First sampled voltage and the 3rd sampled voltage are compared, and produce first comparison circuit of control signal according to comparative result; Second sampled voltage and the 3rd sampled voltage are compared, and produce second comparison circuit of control signal according to comparative result;
First regulating circuit of the output current of first power supply being adjusted according to the control signal of first comparison circuit; Second regulating circuit of the output current of second source being adjusted according to the control signal of second comparison circuit;
Described first power supply connects first sample circuit, and described first sample circuit also connects described first comparison circuit and first regulating circuit respectively; Described second source connects second sample circuit, and described second sample circuit also connects described second comparison circuit and second regulating circuit respectively; Described first regulating circuit also is connected with first comparison circuit and the 3rd sample circuit, and second regulating circuit also is connected with second comparison circuit and the 3rd sample circuit; Described output general supply is connected with the 3rd sample circuit, and described the 3rd sample circuit also is connected with first comparison circuit and second comparison circuit respectively.
8. power supply parallel current-sharing circuit as claimed in claim 7 is characterized in that, described first sample circuit comprises: the resistance R 2 and first differential amplifier, and an end of resistance R 2 connects the output of first power supply, and the other end connects regulating circuit; Two signal input parts of first differential amplifier are connected with the two ends of resistance R 2, produce described first sampled voltage, and the signal output part of first differential amplifier is connected with first comparison circuit;
Described second sample circuit comprises: the resistance R 17 and second differential amplifier, and an end of resistance R 17 connects the output of second source, and the other end connects regulating circuit; Two signal input parts of second differential amplifier are connected with the two ends of resistance R 17, can produce described second sampled voltage, and the signal output part of second differential amplifier is connected with second comparison circuit;
Described the 3rd sample circuit comprises: resistance R 18 and the 3rd differential amplifier, and an end of resistance R 18 is connected with first regulating circuit and second regulating circuit, and the other end is connected with the output general supply; Two signal input parts of the 3rd differential amplifier are connected with the two ends of resistance R 18, can produce described the 3rd sampled voltage, and the signal output part of the 3rd differential amplifier is connected with first comparison circuit and second comparison circuit respectively.
9. as claim 7 or 8 described power supply parallel current-sharing circuit, it is characterized in that, comprise that also a plurality of power supplys are in parallel with first power supply and second source, corresponding sample circuit, comparison circuit and the regulating circuit of connecting of the output of each power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202604250U CN201690362U (en) | 2009-11-16 | 2009-11-16 | Flow equalizing circuit for parallel connection of power supplies |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202604250U CN201690362U (en) | 2009-11-16 | 2009-11-16 | Flow equalizing circuit for parallel connection of power supplies |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201690362U true CN201690362U (en) | 2010-12-29 |
Family
ID=43378639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202604250U Expired - Fee Related CN201690362U (en) | 2009-11-16 | 2009-11-16 | Flow equalizing circuit for parallel connection of power supplies |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201690362U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104065373A (en) * | 2014-06-24 | 2014-09-24 | 北京控制工程研究所 | Linear work power MOSFET transistor parallel-connection method |
| CN104935156A (en) * | 2015-06-26 | 2015-09-23 | 长沙广义变流技术有限公司 | Dynamic current sharing control method and circuit |
| CN107728694A (en) * | 2017-10-25 | 2018-02-23 | 深圳市华星光电半导体显示技术有限公司 | Supply unit and its current equalizing method |
| WO2018214470A1 (en) * | 2017-05-24 | 2018-11-29 | 华为技术有限公司 | Current equalization circuit, array circuit and multi-phase converter |
| CN109039045A (en) * | 2018-09-03 | 2018-12-18 | 山东超越数控电子股份有限公司 | LDO parallel current-equalizing circuit |
| CN109061438A (en) * | 2018-07-17 | 2018-12-21 | 武汉精测电子集团股份有限公司 | A kind of multiple power supplies parallel current-sharing device and method for the detection of mould group |
| CN109194029A (en) * | 2018-10-31 | 2019-01-11 | 北京无线电测量研究所 | A kind of high voltage power supply parallel current-sharing system |
| CN111106743A (en) * | 2019-12-31 | 2020-05-05 | 苏州浪潮智能科技有限公司 | Circuit structure for realizing current sharing of hot-plug MOSFET |
| CN111478570A (en) * | 2020-05-08 | 2020-07-31 | 中国南方电网有限责任公司超高压输电公司天生桥局 | PMOS-based low-power-consumption redundant current-sharing circuit |
-
2009
- 2009-11-16 CN CN2009202604250U patent/CN201690362U/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104065373A (en) * | 2014-06-24 | 2014-09-24 | 北京控制工程研究所 | Linear work power MOSFET transistor parallel-connection method |
| CN104065373B (en) * | 2014-06-24 | 2017-03-15 | 北京控制工程研究所 | A kind of linear work power MOSFET tube parallel method |
| CN104935156A (en) * | 2015-06-26 | 2015-09-23 | 长沙广义变流技术有限公司 | Dynamic current sharing control method and circuit |
| CN104935156B (en) * | 2015-06-26 | 2016-03-30 | 长沙广义变流技术有限公司 | A kind of dynamic current equalizing control method and circuit |
| US11095224B2 (en) | 2017-05-24 | 2021-08-17 | Huawei Technologies Co., Ltd. | Current equalization circuit, current equalization array circuit, and multiphase converter |
| WO2018214470A1 (en) * | 2017-05-24 | 2018-11-29 | 华为技术有限公司 | Current equalization circuit, array circuit and multi-phase converter |
| CN107728694B (en) * | 2017-10-25 | 2020-01-31 | 深圳市华星光电半导体显示技术有限公司 | Power supply device and current equalizing method thereof |
| CN107728694A (en) * | 2017-10-25 | 2018-02-23 | 深圳市华星光电半导体显示技术有限公司 | Supply unit and its current equalizing method |
| CN109061438A (en) * | 2018-07-17 | 2018-12-21 | 武汉精测电子集团股份有限公司 | A kind of multiple power supplies parallel current-sharing device and method for the detection of mould group |
| CN109061438B (en) * | 2018-07-17 | 2021-03-09 | 武汉精测电子集团股份有限公司 | Multi-path power supply parallel current equalizing device and method for module detection |
| CN109039045A (en) * | 2018-09-03 | 2018-12-18 | 山东超越数控电子股份有限公司 | LDO parallel current-equalizing circuit |
| CN109194029A (en) * | 2018-10-31 | 2019-01-11 | 北京无线电测量研究所 | A kind of high voltage power supply parallel current-sharing system |
| CN111106743A (en) * | 2019-12-31 | 2020-05-05 | 苏州浪潮智能科技有限公司 | Circuit structure for realizing current sharing of hot-plug MOSFET |
| CN111478570A (en) * | 2020-05-08 | 2020-07-31 | 中国南方电网有限责任公司超高压输电公司天生桥局 | PMOS-based low-power-consumption redundant current-sharing circuit |
| CN111478570B (en) * | 2020-05-08 | 2021-03-19 | 中国南方电网有限责任公司超高压输电公司天生桥局 | PMOS-based low-power-consumption redundant current-sharing circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201690362U (en) | Flow equalizing circuit for parallel connection of power supplies | |
| CN100379112C (en) | Average current type current-equalizing circuit and its formed power supply and power supply system | |
| CN106710531B (en) | Backlight control circuit and electronic device | |
| CN103841728B (en) | Multichannel loading balanced steady flow control circuit, corresponding electrical combination and control method | |
| CN103475202B (en) | A kind of power module power output with overcurrent protection expands circuit | |
| CN102981482A (en) | Power supply circuit and method | |
| CN103412637A (en) | Energy-saving method of phase number variable CPU VR (Central Processing Unit Voltage Regulation) | |
| CN103869857A (en) | Realization circuit and realization method of constant current and constant power | |
| CN202586343U (en) | Parallel power-source power unit | |
| CN113258558B (en) | Multi-path uncontrollable rectifying parallel arbitrary current distribution device | |
| CN107231096A (en) | The multistage loop control circuit of primary side feedback Switching Power Supply | |
| CN207083015U (en) | A kind of mu balanced circuit with multiple-channel output | |
| CN107590041B (en) | Voltage weighted feedback system with multiple feedback points | |
| CN102789251B (en) | Current adjustable constant current circuit | |
| CN203745937U (en) | Device for distributing currents of multipath power sources at will | |
| CN203406822U (en) | A wind speed adjusting circuit and an air conditioner | |
| CN203405750U (en) | Voltage stabilizing circuit and voltage stabilizing power supply device | |
| CN103096567A (en) | Multi-channel current control circuit and control method | |
| CN202008814U (en) | Driving circuit and liquid crystal television | |
| CN216355293U (en) | Power driver circuit of laser and laser | |
| CN203942669U (en) | Equalizing control circuit and corresponding circuit combination | |
| CN216313070U (en) | Universal input interface circuit | |
| CN205142005U (en) | Pwm voltage regulating circuit and constant voltage source circuit | |
| CN100370388C (en) | Feedback circuit for multi-channel output switch electric source and realizing method | |
| CN103809719A (en) | Circuit board and power supply management system for circuit board |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101229 Termination date: 20151116 |
|
| EXPY | Termination of patent right or utility model |