CN212518763U - Power supply current-sharing controller - Google Patents
Power supply current-sharing controller Download PDFInfo
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- CN212518763U CN212518763U CN202021233444.7U CN202021233444U CN212518763U CN 212518763 U CN212518763 U CN 212518763U CN 202021233444 U CN202021233444 U CN 202021233444U CN 212518763 U CN212518763 U CN 212518763U
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Abstract
The utility model provides a power supply controller that flow equalizes, including the current sampling circuit, the current sampling circuit includes operational amplifier U1, sampling resistance R1, resistance R2, resistance R3, resistance R4 and resistance R5. The utility model discloses be favorable to flow equalization controller's miniaturization and reduce cost, avoided operational amplifier to appear the problem that input common mode voltage surpassed the scope in the high-end differential formula current sampling of similar shunt, ground wire chaotic problem among the shunt low side voltage sampling circuit can not appear, guaranteed the interference killing feature in sampling return circuit and sampling signal's accuracy.
Description
Technical Field
The utility model relates to a power flow equalizing technical field especially relates to a power flow equalizing controller.
Background
In practical application, a switching power supply with a power supply power of more than hundreds of kilowatts is often used for supplying power to the system, and because the maximum output power of a single switching power supply module is only a few kilowatts, a high-power supply system needs to use a plurality of switching power supplies to run in parallel so as to meet the requirement of load power. When a plurality of switching power supplies are operated in parallel, in order to fully utilize the effective capacity of each power supply, the load current borne by each power supply needs to be reasonably distributed through a current sharing controller. The power supply current-sharing controller generally collects current and voltage on a direct current bus of the switching power supply, acquires direct current output current of each switching power supply and maximum current difference of direct current output of all the switching power supplies according to the sampled current, and the CPU controls the PWM generating circuit to generate PWM signals to control the output of the switching power supplies according to the acquired voltage signals and current signals of the direct current output of each switching power supply and the maximum current and maximum current difference of the direct current output of all the switching power supplies and a certain current-sharing control method so as to realize the parallel current-sharing output of the switching power supply modules.
The power supply current-sharing controller usually collects the direct current bus current of the switching power supply through a current sensor or a current divider, and the current sensor is large in size, high in price and not beneficial to cost control and miniaturization; the sampling of the current divider can cause disorder to a ground loop of a power supply or has contradiction between input common-mode voltage and amplification factor, and the anti-interference capability and the sampling precision are low.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a power flow equalizing controller that miniaturization, small, interference killing feature and sampling precision are high.
The technical scheme of the utility model is realized like this: a power supply current sharing controller comprises a current sampling circuit, wherein the current sampling circuit comprises an operational amplifier U1, a sampling resistor R1, a resistor R2, a resistor R3, a resistor R4 and a resistor R5;
the sampling resistor R1 is connected to the negative electrode of the DC bus of the parallel switch power supply, one end of the sampling resistor R1 is connected with the inverting input end of the operational amplifier U1 through a resistor R2, the other end of the sampling resistor R1 is connected with the non-inverting input end of the operational amplifier U1 through a resistor R4, the non-inverting input end of the operational amplifier U1 and the common end of the resistor R4 are grounded through a resistor R5, and the output end of the operational amplifier U1 is connected with the inverting input end of the operational amplifier U1 through a resistor R3.
Optionally, the power supply current-sharing controller further includes a voltage sampling circuit, a current-sharing signal generating circuit, an AD conversion module, and a CPU;
the input end of the voltage sampling circuit is connected with the positive electrode of a direct current bus of a parallel switch power supply, and the output end of the voltage sampling circuit is connected with the first input end of the AD conversion module;
the output end of the operational amplifier U1 is divided into two paths, one path is directly connected with the second input end of the AD conversion module, and the other path is connected with the AD conversion module through the current-sharing signal generation circuit; the current-sharing signal generating circuit is used for generating a maximum current signal and a maximum current difference signal of all parallel switching power supplies according to an output signal of the operational amplifier U1;
and the output end of the AD conversion module is connected with the CPU.
Optionally, the voltage sampling circuit includes a voltage sensor.
Optionally, the current-sharing signal generating circuit includes a second current-sharing bus, a first current-sharing bus, a differential amplifier, and a diode D1;
the output end of the operational amplifier U1 is connected with the non-inverting input end of the differential amplifier through the anode of the diode D1 and the cathode of the diode D1 in sequence, the output end of the operational amplifier U1 and the common end of the anode of the diode D1 are also directly connected with the inverting input end of the differential amplifier, the output end of the differential amplifier is connected with the second current-sharing bus, the second current-sharing bus is also connected with the third input end of the AD conversion module, the cathode of the diode D1 and the common end of the non-inverting input end of the differential amplifier are connected with the first current-sharing bus, and the first current-sharing bus is also connected with the fourth input end of the AD conversion module.
Optionally, the current-sharing signal generating circuit further includes a diode D2, the diode D2 is connected between the output end of the differential amplifier and the second current-sharing bus, and the output end of the differential amplifier is connected to the second current-sharing bus through the anode of the diode D2 and the cathode of the diode D2 in sequence.
Optionally, the amplification factor of the differential amplifier is 1.
The utility model discloses a power current-sharing controller has following beneficial effect for prior art:
(1) the utility model uses the sampling circuit composed of the sampling resistor and the differential circuit to replace the traditional current sensor, which is beneficial to the miniaturization and cost reduction of the current-sharing controller; the current sampling resistor is connected to the negative electrode of the direct-current bus of the power supply, so that the problem that the input common-mode voltage exceeds the range in differential current sampling similar to the high end of the shunt of the operational amplifier is solved; the voltage difference between the two ends of the sampling resistor is amplified in proportion, so that the grounding mode of the operational amplifier does not cause the problem of disordered ground wires in the voltage sampling circuit at the low end of the shunt; meanwhile, the current sampling mode ensures that the output voltage sampling and the output current sampling do not interfere with each other, thereby ensuring the anti-interference capability of a sampling loop and the accuracy of a sampling signal;
(2) the utility model discloses a signal production circuit flow equalizes has adopted the structure of two generating lines that flow equalize, not only provides the maximum current among all parallel operation switching power supply output current for CPU, still provides the current various current-sharing controller can't provide the maximum current difference signal to make the operating condition of the connected system that CPU can be better, provide more accurate foundation for flow-equalizing control.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a circuit diagram of a current sampling circuit according to the present invention;
fig. 2 is a schematic structural diagram of the power supply current sharing controller of the present invention;
fig. 3 is a circuit diagram of the current-sharing signal generating circuit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
As shown in fig. 2, the power supply current-sharing controller of the present embodiment includes a current sampling circuit, a voltage sampling circuit, a current-sharing signal generating circuit, an AD conversion module, and a CPU;
the current sampling circuit comprises an operational amplifier U1, a sampling resistor R1, a resistor R2, a resistor R3, a resistor R4 and a resistor R5, wherein the sampling resistor R1 is connected to the negative electrode of a direct current bus of a switching power supply, one end of the sampling resistor R1 is connected with the inverting input end of the operational amplifier U1 through a resistor R2, the other end of the sampling resistor R1 is connected with the non-inverting input end of an operational amplifier U1 through a resistor R4, the non-inverting input end of the operational amplifier U1 and the common end of the resistor R4 are grounded through a resistor R5, and the output end of the operational amplifier U1 is connected with the inverting input end of the operational amplifier U1 through a resistor. The operational amplifier U1, the resistor R2, the resistor R3, the resistor R4 and the resistor R5 form a differential amplifier circuit, the amplification factor of which is determined by the resistor R2, the resistor R3, the resistor R4 and the resistor R5, in this embodiment, preferably, the resistor R2 has the same resistance as the resistor R3, the resistor R4 has the same resistance as the resistor R5, the amplification factor of the differential amplifier circuit is 1, the voltage difference between the two ends of the sampling resistor R1 is equal to the output voltage of the operational amplifier U1, and the current flowing through the sampling resistor R1 (i.e., the output current of the switching power supply) is equal to the ratio of the output voltage of the operational amplifier U1 to the output voltage of the R1.
The voltage sampling circuit can be a voltage sensor and is used for collecting the output voltage of each switching power supply module. The input end of the voltage sampling circuit is connected with the positive electrode of the direct-current bus of the switching power supply, and the output end of the voltage sampling circuit is connected with the first input end of the AD conversion module. The output end of the operational amplifier U1 is divided into two paths, one path is directly connected with the second input end of the AD conversion module, and the other path is connected with the AD conversion module through the current-sharing signal generating circuit. The output end of the AD conversion module is connected with the CPU.
The current-sharing signal generating circuit is used for generating a maximum current signal and a maximum current difference signal of all parallel switching power supplies according to an output signal of the operational amplifier U1. The current-sharing signal generating circuit comprises a second current-sharing bus, a first current-sharing bus, a differential amplifier, a diode D1 and a diode D2; the output end of the operational amplifier U1 is connected with the non-inverting input end of the differential amplifier through the anode of the diode D1 and the cathode of the diode D1 in sequence, the output end of the operational amplifier U1 and the common end of the anode of the diode D1 are also directly connected with the inverting input end of the differential amplifier, the output end of the differential amplifier is connected with a second current-sharing bus through the anode of the diode D2 and the cathode of the diode D2 in sequence, the second current-sharing bus is also connected with the third input end of the AD conversion module, the cathode of the diode D1 and the common end of the non-inverting input end of the differential amplifier are connected with a first current-sharing bus, and the first current-sharing bus. The differential amplifier includes an operational amplifier U2, a resistor R6, a resistor R7, a resistor R8, and a resistor R9, which are common principles.
It should be noted that, in all the parallel switch power supply modules in this embodiment, each switch power supply module is connected to a voltage sampling circuit, a current sampling circuit, a diode D1, a differential amplifier, a diode D2, and an AD conversion module, and all the switch power supply modules share the second current-sharing bus, the first current-sharing bus, and the CPU.
Generally, the detection of the direct current bus current of the switching power supply comprises current sensor detection, shunt low-end current detection and shunt high-end differential current detection, and the current sensor has large volume and high price and is not beneficial to cost control and miniaturization of a power supply current sharing controller; the sampling at the low end of the current divider can cause disorder to the ground loop of the power supply; the current divider high-end differential current sampling has the contradiction between the input common-mode voltage range and the amplification factor. In the embodiment, the current sampling resistor is connected to the negative electrode of the direct-current bus of the power supply, so that the problem that the input common-mode voltage exceeds the range in differential current sampling similar to the high end of the shunt of the operational amplifier is solved; in addition, the circuit adopts a differential current sampling mode, namely the voltage difference between two ends of the sampling resistor is amplified in proportion, so that the problem of disordered ground wires in the voltage sampling circuit at the low end of the shunt can not occur in the grounding mode of the operational amplifier; meanwhile, the sampling mode ensures that the output voltage sampling and the output current sampling do not interfere with each other, thereby ensuring the anti-interference capability of a sampling loop and the accuracy of a sampling signal.
In the embodiment, a voltage signal of a direct-current bus of a switching power supply generated by a voltage sampling circuit is input to an AD conversion module for AD conversion; the switch power supply direct current bus current signal that the current sampling circuit produced is sent into AD conversion module on the one hand and carries out AD conversion, and on the other hand is sent into the signal generation circuit that flow equalizes. Because all the switching power supplies which are operated in parallel connect the current signals output by the respective current sampling circuits with the common first current-sharing bus through the respective diodes D1, according to the working characteristics of the diodes, only the switching power supply with the largest output current can send the output current signal of the switching power supply to the first current-sharing bus through the diode D1, and the diodes D1 of the other switching power supplies are in a reverse cut-off state, so that the current signal on the first current-sharing bus is always the largest current signal in the output currents of all the switching power supplies. The voltage difference between two ends of the diode D1 is sent to the second current-sharing bus through the operational amplifier U2 and the diode D2, the diode D2 is used for preventing the switching power supply with larger output voltage from outputting the switching power supply with smaller output voltage as a load, so that instability of the system and reduction of the overall efficiency of the system are avoided, the differential amplifier is normally used as a follower, the amplification factor is preferably 1, the calculation of a CPU can be simplified, and the resistance values of the resistor R6, the resistor R7, the resistor R8 and the resistor R9 can be changed to be an amplifier. Since all switching power supplies feed the voltage difference signal across the respective diode D1 to the common second current sharing bus through the respective operational amplifier U2 and diode D2, only the maximum voltage difference signal can be fed to the second current sharing bus.
Because one end of the diode D1 is the maximum current signal and the other end is the output current signal of the single switching power supply, the voltage difference between the two ends indicates the difference between the output current of the single switching power supply and the current maximum output current, i.e. the signal on the second current-sharing bus is always the difference between the maximum output current value and the minimum output current value of the switching power supplies operating in parallel. And the maximum current signal on the first current-sharing bus and the maximum current difference signal on the second current-sharing bus are jointly sent to the AD conversion module.
The AD conversion module circuit converts the output voltage signal, the output current signal, the maximum current signal and the maximum current difference signal into digital signals and transmits the digital signals to the CPU, and the CPU controls the output PWM signals according to the data and a certain current sharing control method. The PWM signal drives the power electronic device in the switching power supply, the switching state of the power electronic device is controlled, finally, on the premise that the output voltage meets the requirement of a direct-current voltage bus, the output current of the power electronic device is approximately equal to the output current of other direct-current power supplies, and when the error meets the requirement of current sharing precision, current sharing control is achieved.
The current-sharing signal generating circuit in the sample embodiment adopts a double current-sharing bus structure, not only provides the maximum current of all output currents of the parallel operation switching power supply for the CPU, but also provides the maximum current difference signal which cannot be provided by the existing various current-sharing controllers, so that the CPU can be better connected with the operation state of the system, and more accurate basis is provided for current-sharing control.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A power supply current sharing controller comprises a current sampling circuit, and is characterized in that the current sampling circuit comprises an operational amplifier U1, a sampling resistor R1, a resistor R2, a resistor R3, a resistor R4 and a resistor R5;
the sampling resistor R1 is connected to the negative electrode of the DC bus of the parallel switch power supply, one end of the sampling resistor R1 is connected with the inverting input end of the operational amplifier U1 through a resistor R2, the other end of the sampling resistor R1 is connected with the non-inverting input end of the operational amplifier U1 through a resistor R4, the non-inverting input end of the operational amplifier U1 and the common end of the resistor R4 are grounded through a resistor R5, and the output end of the operational amplifier U1 is connected with the inverting input end of the operational amplifier U1 through a resistor R3.
2. The power supply current sharing controller of claim 1, further comprising a voltage sampling circuit, a current sharing signal generating circuit, an AD conversion module, and a CPU;
the input end of the voltage sampling circuit is connected with the positive electrode of a direct current bus of a parallel switch power supply, and the output end of the voltage sampling circuit is connected with the first input end of the AD conversion module;
the output end of the operational amplifier U1 is divided into two paths, one path is directly connected with the second input end of the AD conversion module, and the other path is connected with the AD conversion module through the current-sharing signal generation circuit; the current-sharing signal generating circuit is used for generating a maximum current signal and a maximum current difference signal of all parallel switching power supplies according to an output signal of the operational amplifier U1;
and the output end of the AD conversion module is connected with the CPU.
3. The power supply current share controller of claim 2, wherein the voltage sampling circuit comprises a voltage sensor.
4. The power supply current sharing controller of claim 2, wherein the current sharing signal generating circuit comprises a second current sharing bus, a first current sharing bus, a differential amplifier and a diode D1;
the output end of the operational amplifier U1 is connected with the non-inverting input end of the differential amplifier through the anode of the diode D1 and the cathode of the diode D1 in sequence, the output end of the operational amplifier U1 and the common end of the anode of the diode D1 are also directly connected with the inverting input end of the differential amplifier, the output end of the differential amplifier is connected with the second current-sharing bus, the second current-sharing bus is also connected with the third input end of the AD conversion module, the cathode of the diode D1 and the common end of the non-inverting input end of the differential amplifier are connected with the first current-sharing bus, and the first current-sharing bus is also connected with the fourth input end of the AD conversion module.
5. The power supply current sharing controller of claim 4 wherein the current sharing signal generating circuit further comprises a diode D2, a diode D2 is connected between the output end of the differential amplifier and the second current sharing bus, and the output end of the differential amplifier is connected to the second current sharing bus through the anode of the diode D2 and the cathode of the diode D2 in sequence.
6. The power supply current sharing controller of claim 4 wherein the amplification of the differential amplifier is 1.
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| CN202021233444.7U CN212518763U (en) | 2020-06-30 | 2020-06-30 | Power supply current-sharing controller |
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| CN202021233444.7U CN212518763U (en) | 2020-06-30 | 2020-06-30 | Power supply current-sharing controller |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114132193A (en) * | 2021-11-30 | 2022-03-04 | 长春捷翼汽车零部件有限公司 | New energy electronic lock, feedback control circuit and feedback control method thereof and new energy automobile |
| CN115856400A (en) * | 2023-02-17 | 2023-03-28 | 中电装备山东电子有限公司 | Current sampling circuit and electric energy meter |
-
2020
- 2020-06-30 CN CN202021233444.7U patent/CN212518763U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114132193A (en) * | 2021-11-30 | 2022-03-04 | 长春捷翼汽车零部件有限公司 | New energy electronic lock, feedback control circuit and feedback control method thereof and new energy automobile |
| CN115856400A (en) * | 2023-02-17 | 2023-03-28 | 中电装备山东电子有限公司 | Current sampling circuit and electric energy meter |
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