CN1786861A - Circuit for realizing autonomous equalizing current of parallel electric source module - Google Patents
Circuit for realizing autonomous equalizing current of parallel electric source module Download PDFInfo
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Abstract
The invention relates to a circuit for realizing automatic current equalization of a parallel power supply module, comprising: a voltage control loop used to feed the output voltage of the power supply module back to a power supply module control circuit; a current sampling unit, connected in series on a power supply output loop to sample the output currents of the power supply module. And the voltage control loop is also used to convert the output current of the power supply module into a voltage signal and feed the voltage signal to the power supply module control circuit so as to control the output voltage of the power supply module to change with its output current. The circuit of the invention can realize soft output property of the power supply and achieve automatic current equalizing ability, and has the advantages of low system cost, simple circuit, low power consumption, good current equalizing effect, ability to assure power supply reliability, and good effect on a high voltage output module.
Description
[technical field]
The present invention relates to a kind of circuit of realizing autonomous equalizing current of parallel electric source module, be specially adapted to output voltage and require than the reasonable communication module power supply in parallel of coherence request higher, each power supply than the output accuracy of the variable quantity higher, that output voltage allows certain limit, power supply.
[background technology]
At present, the communication module power supply is often in parallel to be used, to increase load capacity.Parallel current-sharing method commonly used is to be used for the chip of current-sharing or to use flow equalizing circuit to realize in module-external in inside modules, the cost height, and the circuit complexity, product reliability reduces, and power consumption is bigger.
[summary of the invention]
The object of the present invention is to provide a kind of do not need special-purpose current-sharing chip or circuit flow equalizing circuit, that can realize autonomous equalizing current of parallel electric source module.
The technical solution adopted for the present invention to solve the technical problems is: a kind of circuit of realizing autonomous equalizing current of parallel electric source module, comprise the Control of Voltage loop, and be used for the output voltage of power module is fed back to the power module control circuit;
Also comprise current sampling unit, be connected in series on the power module output loop, be used for the output current of power module is sampled;
Described Control of Voltage loop also is used for converting described module output current to a voltage signal, feeds back to the power module control circuit, changes along with the variation of its output current with the output voltage of controlling power module.
Described current sampling unit is connected in series in power module negative output terminal, is positioned at before or after the output filter capacitor.
Among the present invention, described current sampling unit is a kind of in current sampling resistor, current transformer or the Hall element, is positioned at before the output filter capacitor.
Described current sampling unit is a current sampling resistor, between output filter capacitor or afterwards.
As a kind of implementation of the present invention, described Control of Voltage loop comprises first operational amplifier, second operational amplifier, first divider resistance, second divider resistance, first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance and voltage-reference diode;
Described first divider resistance links to each other with the positive output end of power module with second divider resistance series connection back, one end, and the other end links to each other with module negative output terminal; The normal phase input end of described first operational amplifier links to each other with negative-phase input with the output terminal of second operational amplifier by second resistance, its inverting input links to each other with the tie point of first divider resistance with second divider resistance by first resistance, its output terminal links to each other with the control circuit of power module, its negative power end links to each other with accessory power supply, and its positive power source terminal links to each other with the anode of voltage-reference diode; The normal phase input end of second operational amplifier links to each other with anode by the negative electrode of the 3rd resistance and the 4th resistance voltage-reference diode respectively, and its negative power end links to each other with accessory power supply, and its positive power source terminal links to each other with the anode of voltage-reference diode; The negative electrode of voltage-reference diode also links to each other with accessory power supply by the 5th resistance, and its anode links to each other with the high voltage end of current sampling resistor.
As another kind of implementation of the present invention, described Control of Voltage loop comprises first operational amplifier, first divider resistance, second divider resistance, first resistance, the 5th resistance, the 6th resistance and voltage-reference diode;
Described first divider resistance links to each other with the positive output end of power module with second divider resistance series connection back, one end, and the other end links to each other with module negative output terminal; The normal phase input end of described first operational amplifier links to each other with the negative electrode of voltage-reference diode by the 6th resistance, its inverting input links to each other with the tie point of first divider resistance with second divider resistance by first resistance, its output terminal links to each other with the control circuit of power module, its negative power end links to each other with accessory power supply, and its positive power source terminal links to each other with the anode of voltage-reference diode and the high voltage end of current sampling resistor; Voltage-reference diode also links to each other with accessory power supply by the 5th resistance.
As another kind of implementation of the present invention, described Control of Voltage loop comprises first operational amplifier, first divider resistance, second divider resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance and voltage-reference diode;
Described first divider resistance links to each other with the positive output end of power module with second divider resistance series connection back, one end, and the other end links to each other with module negative output terminal; The normal phase input end of described first operational amplifier links to each other with the negative pole of voltage-reference diode by the 6th resistance, its inverting input links to each other with the tie point of first divider resistance with second divider resistance by first resistance, its output terminal links to each other with the control circuit of power module, its negative power end links to each other with accessory power supply, and its positive power source terminal links to each other with the positive pole of voltage-reference diode; The 7th resistance is connected in parallel between the negative pole and reference voltage end of voltage-reference diode; The 8th resistance is connected in parallel between the positive pole and reference voltage end of voltage-reference diode; The negative pole of voltage-reference diode also links to each other with accessory power supply by the 5th resistance, and its positive pole links to each other with the high voltage end of current sampling resistor.
In the circuit of the present invention, the low-voltage end of current sampling resistor links to each other with power module negative output terminal.
The present invention on the basis of existing technology, flow signal feedback to the Control of Voltage loop by power taking in main circuit, convert described current signal to a voltage signal again, feed back to the modular power source control circuit, change along with the variation of its output current with the output voltage of controlling each power module, thereby realize the software feature of power supply output, obtain the ability of autonomous equalizing current, whole like this parallel electric source module no longer needs special-purpose current-sharing chip or flow equalizing circuit, has reduced the cost of system, and circuit is simple, power consumption is little, the current-sharing effect is better, can guarantee the reliability of power supply, especially for high voltage output module, effect is fine.
[description of drawings]
Fig. 1 is a kind of circuit structure block diagram of the present invention.
Fig. 2 is the circuit structure schematic diagram of an embodiment of the present invention.
Fig. 3 is the another kind of circuit structure block diagram of the present invention.
Fig. 4 is the third circuit structure block diagram of the present invention.
Fig. 5 is the circuit structure diagram of first embodiment of the invention.
Fig. 6 is the circuit structure diagram of second embodiment of the invention.
Fig. 7 is the circuit structure diagram of third embodiment of the invention.
[embodiment]
The present invention is further elaborated with specific embodiment with reference to the accompanying drawings below.
Power module system of the present invention mainly comprises power module main circuit 1, current sampling unit 2 and Control of Voltage loop 3.Wherein, current sampling unit 2 is connected in series on the power module output loop, is used for the output current of power module is sampled.Control of Voltage loop 3, be used for the power module output voltage is fed back to the control circuit of power module main circuit 1, feed back to described control circuit after converting described module output current to a voltage signal simultaneously, change along with the variation of its output current with the output voltage of controlling power module.
Embodiment one:
As shown in Figure 5, current sampling resistor Rs be connected in series in power module negative output end vo-, be positioned at after the output filter capacitor C1 its low-voltage end and power module negative output end vo-link to each other.Control of Voltage loop 3 comprises the first operational amplifier U1, the second operational amplifier U2, the first divider resistance Ra, the second divider resistance Rb, first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5 and voltage-reference diode UZ.The first divider resistance Ra and second divider resistance Rb series connection back, one end links to each other with the positive output end Vo+ of power module, the other end and power module negative output end vo-link to each other.The normal phase input end of the first operational amplifier U1 links to each other with negative-phase input with the output terminal of the second operational amplifier U2 by second resistance R 2, its inverting input links to each other with the tie point of the first divider resistance Ra and the second divider resistance Rb by first resistance R 1, its output terminal links to each other with the control circuit of power module, its negative power end links to each other with accessory power supply VCC, and its positive power source terminal links to each other with the anode of voltage-reference diode UZ.The normal phase input end of the second operational amplifier U2 links to each other with anode by the negative electrode of the 3rd resistance R 3 and the 4th resistance R 4 voltage-reference diode UZ respectively, and its negative power end links to each other with accessory power supply VCC, and its positive power source terminal links to each other with the anode of voltage-reference diode UZ.The negative electrode of voltage-reference diode UZ also links to each other with accessory power supply VCC by the 5th resistance R 5, and its anode links to each other with the high voltage end of current sampling resistor Rs.According to the common practices in this area, the negative output end vo of each power module in the system-link to each other.
Wherein, L2 is an output inductor, and the second operational amplifier U2 is connected to one and penetrates a grade follow circuit, plays the voltage follower, and Vcc is the accessory power supply of secondary.The output terminal of the first operational amplifier U1 is the control circuit of signal feedback to the power module main circuit 1 the most at last, generally feed back to the negative terminal of power supply secondary benchmark, like this, the output voltage of power module just can change along with the variation of output current, select suitable parameters, just can realize the load characteristic that needs.
According to the empty short empty disconnected principle of operational amplifier, the voltage of the second operational amplifier U2 normal phase input end equals the voltage of the first operational amplifier U1 normal phase input end, all equals the voltage Va of the first operational amplifier U1 inverting input.Because of Va=R3*Vz/ (R3+R4), the output load characteristic equation that can draw Fig. 5 circuit is again:
Vo＝(1+Ra/Rb)Va-Ra*Rs*Io/Rb＝(1+Ra/Rb)R3*Vz/(R3+R4)-Ra*Rs*Io/Rb
Wherein, Vz is a voltage-reference diode voltage, and Io is the output current of power module when connecing load.
For above-mentioned load characteristic equation, as long as resistance is got the load characteristic that suitable parameters just can obtain needs, because output voltage reduces with the increase of output current, so, can utilize this load characteristic to realize autonomous equalizing current a plurality of parallel connections of this power supply.
Embodiment two:
As shown in Figure 6, current sampling resistor Rs be connected in series in power module negative output end vo-, between output filter capacitor C1 and C2, its low-voltage end and power module negative output end vo-link to each other.Control of Voltage loop 3 comprises the first operational amplifier U1, the first divider resistance Ra, the second divider resistance Rb, first resistance R 1, the 5th resistance R 5, the 6th resistance R 6 and voltage-reference diode UZ.The first divider resistance Ra and second divider resistance Rb series connection back, one end links to each other with the positive output end Vo+ of power module, the other end and power module negative output end vo-link to each other.The normal phase input end of the first operational amplifier U1 links to each other with the negative electrode of voltage-reference diode UZ by the 6th resistance R 6, its inverting input links to each other with the tie point of the first divider resistance Ra and the second divider resistance Rb by first resistance R 1, its output terminal links to each other with the control circuit of power module, its negative power end links to each other with accessory power supply VCC, and its positive power source terminal links to each other with the anode of voltage-reference diode UZ and the high voltage end of current sampling resistor Rs.Voltage-reference diode UZ also links to each other with accessory power supply VCC by the 5th resistance R 5.According to the common practices in this area, the negative output end vo of each power module in the system-link to each other.
The output load characteristic of this circuit and the compute classes among the embodiment one are seemingly lacked empty disconnected principle according to the void of amplifier, and Vz equals Va, can draw the output load characteristic equation to be:
Vo＝(1+Ra/Rb)Vz-Ra*Rs*Io/Rb
Vz: voltage-reference diode voltage, Io: the output current when power supply connects load.
As long as above each resistance is got the load characteristic that suitable parameters just can obtain needs.
Embodiment three:
As shown in Figure 7, current sampling resistor Rs be connected in series in power module negative output end vo-, between output filter capacitor C1 and C2, its low-voltage end and power module negative output end vo-link to each other.Control of Voltage loop 3 comprises the first operational amplifier U1, the first divider resistance Ra, the second divider resistance Rb, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8 and voltage-reference diode Uz.The first divider resistance Ra and second divider resistance Rb series connection back, one end links to each other with the positive output end Vo+ of power module, the other end and module negative output end vo-link to each other.The normal phase input end of the first operational amplifier U1 links to each other with the negative pole of voltage-reference diode Uz by the 6th resistance R 6, its inverting input links to each other with the tie point of the first divider resistance Ra and the second divider resistance Rb by first resistance R 1, its output terminal links to each other with the control circuit of power module, its negative power end links to each other with accessory power supply VCC, and its positive power source terminal links to each other with the positive pole of voltage-reference diode Uz.The 7th resistance R 7 is connected in parallel between the negative pole and reference voltage end of voltage-reference diode Uz.The 8th resistance R 8 is connected in parallel between the positive pole and reference voltage end of voltage-reference diode Uz.The negative pole of voltage-reference diode Uz also links to each other with accessory power supply VCC by the 5th resistance R 5, and its positive pole links to each other with the high voltage end of current sampling resistor Rs.According to the common practices in this area, the negative output end vo of each power module in the system-link to each other.
The output load characteristic of this circuit and the compute classes among the embodiment one are seemingly lacked empty disconnected principle according to the void of amplifier, and Vz equals Va, can draw the output load characteristic equation to be:
Vo＝(1+Ra/Rb)Vb-Ra*Rs*Io/Rb
Vb=(1+R3/R4) Vz wherein
Vz: voltage-reference diode voltage, Io: the output current when power supply connects load.
As long as above each resistance is got the load characteristic that suitable parameters just can obtain needs.
In sum, the present invention utilizes one to be connected in series in current sampling unit on the power module output loop, and the output current of power module is sampled.Utilize the Control of Voltage loop to convert described power module output current to a voltage signal again, feed back to the modular power source control circuit, change along with the variation of its output current with the output voltage of controlling power module.As long as change several resistance in the circuit of the present invention parameter just can obtain the load characteristic of needs, circuit has the ability of autonomous equalizing current, whole like this parallel electric source module no longer needs special-purpose current-sharing chip or flow equalizing circuit, reduced the cost of system, circuit is simple, power consumption is little, and the current-sharing effect is better, can guarantee the reliability of power supply, especially for high voltage output module, effect is fine.
Claims (8)
1, a kind of circuit of realizing autonomous equalizing current of parallel electric source module comprises the Control of Voltage loop, is used for the output voltage of power module is fed back to the power module control circuit; It is characterized in that:
Also comprise current sampling unit, be connected in series on the power module output loop, be used for the output current of power module is sampled;
Described Control of Voltage loop also is used for converting described module output current to a voltage signal, feeds back to the power module control circuit, changes along with the variation of its output current with the output voltage of controlling power module.
2, the circuit of realization autonomous equalizing current of parallel electric source module according to claim 1 is characterized in that: described current sampling unit is connected in series in power module negative output terminal (Vo-), is positioned at before or after the output filter capacitor.
3, the circuit of realization autonomous equalizing current of parallel electric source module according to claim 1 and 2 is characterized in that: described current sampling unit is a kind of in current sampling resistor (Rs), current transformer or the Hall element, is positioned at before the output filter capacitor.
4, the circuit of realization autonomous equalizing current of parallel electric source module according to claim 1 and 2 is characterized in that: described current sampling unit is current sampling resistor (Rs), between output filter capacitor or afterwards.
5, the circuit of realization autonomous equalizing current of parallel electric source module according to claim 4 is characterized in that: described Control of Voltage loop comprises first operational amplifier (U1), second operational amplifier (U2), first divider resistance (Ra), second divider resistance (Rb), first resistance (R1), second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4), the 5th resistance (R5) and voltage-reference diode (UZ);
Described first divider resistance (Ra) links to each other with the positive output end (Vo+) of power module with second divider resistance (Rb) series connection back, one end, and the other end links to each other with module negative output terminal (Vo-); The normal phase input end of described first operational amplifier (U1) links to each other with negative-phase input with the output terminal of second operational amplifier (U2) by second resistance (R2), its inverting input links to each other with the tie point of first divider resistance (Ra) with second divider resistance (Rb) by first resistance (R1), its output terminal links to each other with the control circuit of power module, its negative power end links to each other with accessory power supply (VCC), and its positive power source terminal links to each other with the anode of voltage-reference diode (UZ); The normal phase input end of second operational amplifier (U2) links to each other with anode by the negative electrode of the 3rd resistance (R3) and the 4th resistance (R4) voltage-reference diode (UZ) respectively, its negative power end links to each other with accessory power supply (VCC), and its positive power source terminal links to each other with the anode of voltage-reference diode (UZ); The negative electrode of voltage-reference diode (UZ) also links to each other with accessory power supply (VCC) by the 5th resistance (R5), and its anode links to each other with the high voltage end of current sampling resistor (Rs).
6, the circuit of realization autonomous equalizing current of parallel electric source module according to claim 4 is characterized in that:
Described Control of Voltage loop comprises first operational amplifier (U1), first divider resistance (Ra), second divider resistance (Rb), first resistance (R1), the 5th resistance (R5), the 6th resistance (R6) and voltage-reference diode (UZ);
Described first divider resistance (Ra) links to each other with the positive output end (Vo+) of power module with second divider resistance (Rb) series connection back, one end, and the other end links to each other with module negative output terminal (Vo-); The normal phase input end of described first operational amplifier (U1) links to each other with the negative electrode of voltage-reference diode (UZ) by the 6th resistance (R6), its inverting input links to each other with the tie point of first divider resistance (Ra) with second divider resistance (Rb) by first resistance (R1), its output terminal links to each other with the control circuit of power module, its negative power end links to each other with accessory power supply (VCC), and its positive power source terminal links to each other with the anode of voltage-reference diode (UZ) and the high voltage end of current sampling resistor (Rs); Voltage-reference diode (UZ) also links to each other with accessory power supply (VCC) by the 5th resistance (R5).
7, the circuit of realization autonomous equalizing current of parallel electric source module according to claim 4 is characterized in that: described Control of Voltage loop comprises first operational amplifier (U1), first divider resistance (Ra), second divider resistance (Rb), the 5th resistance (R5), the 6th resistance (R6), the 7th resistance (R7), the 8th resistance (R8) and voltage-reference diode (Uz);
Described first divider resistance (Ra) links to each other with the positive output end (Vo+) of power module with second divider resistance (Rb) series connection back, one end, and the other end links to each other with module negative output terminal (Vo-); The normal phase input end of described first operational amplifier (U1) links to each other with the negative pole of voltage-reference diode (Uz) by the 6th resistance (R6), its inverting input links to each other with the tie point of first divider resistance (Ra) with second divider resistance (Rb) by first resistance (R1), its output terminal links to each other with the control circuit of power module, its negative power end links to each other with accessory power supply (VCC), and its positive power source terminal links to each other with the positive pole of voltage-reference diode (Uz); The 7th resistance (R7) is connected in parallel between the negative pole and reference voltage end of voltage-reference diode (Uz); The 8th resistance (R8) is connected in parallel between the positive pole and reference voltage end of voltage-reference diode (Uz); The negative pole of voltage-reference diode (Uz) also links to each other with accessory power supply (VCC) by the 5th resistance (R5), and its positive pole links to each other with the high voltage end of current sampling resistor (Rs).
8, according to the circuit of claim 5,6 or 7 described realization autonomous equalizing current of parallel electric source module, it is characterized in that: the low-voltage end of current sampling resistor (Rs) links to each other with power module negative output terminal (Vo-).
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005101012736A CN100474207C (en) | 2005-11-09 | 2005-11-09 | Circuit for realizing autonomous equalizing current of parallel electric source module |
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| CNB2005101012736A CN100474207C (en) | 2005-11-09 | 2005-11-09 | Circuit for realizing autonomous equalizing current of parallel electric source module |
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| CN1786861A true CN1786861A (en) | 2006-06-14 |
| CN100474207C CN100474207C (en) | 2009-04-01 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594157A (en) * | 2012-04-05 | 2012-07-18 | 重庆安谐新能源技术有限公司 | Signal acquisition device and processing method for alternating current power current-sharing output system |
| CN102005903B (en) * | 2009-08-28 | 2013-01-16 | 华为技术有限公司 | Digital current equalizing method of power source module, power source module and communication equipment |
| CN106972745A (en) * | 2017-05-17 | 2017-07-21 | 成都微泰科技有限公司 | Power supply sharing control system |
| CN114448205A (en) * | 2021-12-24 | 2022-05-06 | 广州金升阳科技有限公司 | Current equalizing circuit, switching power supply and power supply system |
| CN116015060A (en) * | 2023-02-24 | 2023-04-25 | 江苏天合储能有限公司 | Parallel power supply current sharing system, method and circuit |
| CN117147951A (en) * | 2023-06-27 | 2023-12-01 | 深圳达德航空科技有限公司 | Output current sampling method for multi-module parallel power supply device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2206469Y (en) * | 1994-09-02 | 1995-08-30 | 蒋贤华 | Multi-power supply parallel current output equalizing controller |
| CN2425452Y (en) * | 1998-02-19 | 2001-03-28 | 深圳市华为电气股份有限公司 | High-frequency switch electric source device with equalization circuit |
| CN1112749C (en) * | 1999-10-27 | 2003-06-25 | 深圳市中兴通讯股份有限公司 | Full-load range precise current-equalizing device |
| US6438007B1 (en) * | 2000-05-03 | 2002-08-20 | Raymond W. Pilukaitis | Control circuit for paralleling power supplies and method of operation thereof |
| US6822426B1 (en) * | 2003-06-06 | 2004-11-23 | The Boeing Company | Regulator with feedback voltage and current signal summing into controller |
-
2005
- 2005-11-09 CN CNB2005101012736A patent/CN100474207C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005903B (en) * | 2009-08-28 | 2013-01-16 | 华为技术有限公司 | Digital current equalizing method of power source module, power source module and communication equipment |
| CN102594157A (en) * | 2012-04-05 | 2012-07-18 | 重庆安谐新能源技术有限公司 | Signal acquisition device and processing method for alternating current power current-sharing output system |
| CN106972745A (en) * | 2017-05-17 | 2017-07-21 | 成都微泰科技有限公司 | Power supply sharing control system |
| CN114448205A (en) * | 2021-12-24 | 2022-05-06 | 广州金升阳科技有限公司 | Current equalizing circuit, switching power supply and power supply system |
| CN116015060A (en) * | 2023-02-24 | 2023-04-25 | 江苏天合储能有限公司 | Parallel power supply current sharing system, method and circuit |
| CN117147951A (en) * | 2023-06-27 | 2023-12-01 | 深圳达德航空科技有限公司 | Output current sampling method for multi-module parallel power supply device |
| CN117147951B (en) * | 2023-06-27 | 2024-04-05 | 深圳达德航空科技有限公司 | Output current sampling method for multi-module parallel power supply device |
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| Publication number | Publication date |
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| CN100474207C (en) | 2009-04-01 |
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