CN113359927A - Output voltage feedback circuit for differential pressure weighted compensation of redundant diode and application method thereof - Google Patents
Output voltage feedback circuit for differential pressure weighted compensation of redundant diode and application method thereof Download PDFInfo
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- CN113359927A CN113359927A CN202110741721.8A CN202110741721A CN113359927A CN 113359927 A CN113359927 A CN 113359927A CN 202110741721 A CN202110741721 A CN 202110741721A CN 113359927 A CN113359927 A CN 113359927A
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- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
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Abstract
The invention provides a voltage difference weighting compensation output voltage feedback circuit of a redundant diode, which comprises: the DC main power conversion circuit, the reference comparison circuit, the sampling circuit and the output redundancy reverse-filling prevention diode; the anode of the output redundancy reverse-filling prevention diode is connected with the first port of the DC main power conversion circuit; the third port of the DC main power conversion circuit is connected with the first port of the reference comparison circuit; the sampling circuit is connected between the first port of the DC main power conversion circuit and the second port of the DC main power conversion circuit in a bridging mode; the sampling circuit is connected with the reference comparison circuit and feeds back the feedback voltage to the reference comparison circuit; the sampling circuit comprises a weighted sampling circuit connected across the two ends of the redundant anti-reverse-filling diode in a bridging mode. The redundancy diode differential pressure weighting compensation output voltage feedback circuit realizes sampling of the conduction voltage drop of the redundancy diode by adding the weighting sampling circuit on the basis of the common feedback sampling circuit so as to accurately control power output and improve the precision of power output voltage.
Description
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a redundant diode differential pressure weighting compensation output voltage feedback circuit and a using method thereof.
Background
The common power supply adopts a single output to output the power required by the subsequent stage, as shown in fig. 1. When no output occurs in the power failure, the rear stage cannot normally operate.
At present, with the miniaturization and high power of power supply and the requirement of high reliability on power supply of the power supply, in practical power supply application, 2 or more (n) power supplies are largely applied to parallel redundant output, as shown in fig. 2, an input end is connected with a plurality of power supplies in parallel: the power supply comprises a power supply 1, a power supply 2 and a power supply 3 …, wherein the output of each power supply in the redundant power supply must be connected with an output redundant anti-reverse-flow diode so as to ensure that when the power supply fails, the current reverse-flow does not have adverse effect on an output loop. When any one of the redundant power supplies fails and has no output, the other (or n-1) power supply which normally outputs can still provide required power for the later stage. The reliability of the latter stage operation is improved.
Fig. 3 shows a sampling feedback circuit for a power supply module, which is a common sampling feedback circuit without a current-sharing function and including a redundant anti-reverse diode. Taking a power module as an example, the DC main power conversion circuit includes a positive output terminal, a negative output terminal, and a feedback signal input terminal. The sampling voltage division circuit is connected between the anode output end and the cathode output end in a bridge mode, and comprises a sampling voltage division resistor R1 and a sampling voltage division resistor R2 which are connected in series. The output redundancy reverse-filling prevention diode is connected to the rear stage of the sampling voltage division circuit. The reference comparison circuit collects the voltages of the sampling voltage-dividing resistor R1 and the sampling voltage-dividing resistor R2 and feeds the voltages back to the DC main power conversion circuit through a feedback signal input end.
Because the conduction voltage difference of the redundant reverse-filling prevention diode is related to the output current of the redundant reverse-filling prevention diode, the output voltage of the whole power supply changes along with the change of the output current, namely the load regulation rate is increased, and the output voltage precision of the power supply is reduced. And the output voltage variation and the output current value have a nonlinear relation. When the output current changes, the conduction voltage drop of the redundant diode changes along with the change, so that the load regulation rate of the power supply is increased, and the output voltage precision of the power supply is reduced. Such a problem cannot be avoided based on the existing sampling feedback circuit.
Disclosure of Invention
In view of the above problem, the present invention provides a redundant diode differential voltage weighted compensation output voltage feedback circuit, which includes: the DC main power conversion circuit, the reference comparison circuit, the sampling circuit and the output redundancy reverse-filling prevention diode;
the anode of the output redundancy reverse-filling prevention diode is connected with the first port of the DC main power conversion circuit;
the third port of the DC main power conversion circuit is connected with the first port of the reference comparison circuit;
the sampling circuit is connected between the first port of the DC main power conversion circuit and the second port of the DC main power conversion circuit in a bridging mode;
the sampling circuit is connected with the reference comparison circuit and feeds back the feedback voltage to the reference comparison circuit;
the sampling circuit comprises a weighting sampling circuit which is connected with two ends of the redundancy anti-reverse-filling diode in a bridging mode.
Further, the air conditioner is provided with a fan,
the weighted sampling circuit comprises a first weighted sampling branch and a second weighted sampling branch;
the first end of the first weighting sampling branch circuit is connected with the anode of the output redundancy reverse-filling prevention diode;
the first end of the second weighted sampling branch circuit is connected with the cathode of the output redundant reverse-filling prevention diode;
the second end of the first weighted sampling branch is connected with the second end of the second weighted sampling branch.
Further, the air conditioner is provided with a fan,
the first weighted sampling branch circuit comprises a first weighted sampling resistor and a first weighted sampling isolation diode which are connected in series;
the second weighted sampling branch comprises a second weighted sampling resistor and a second weighted sampling isolation diode which are connected in series;
the first weighted sampling resistor is connected with the anode of the output redundancy reverse-filling prevention diode;
the second weighted sampling resistor is connected with the cathode of the output redundancy reverse-filling prevention diode.
Further, the air conditioner is provided with a fan,
the sampling circuit comprises a voltage division circuit, and the voltage division circuit is connected with the reference comparison circuit;
the voltage division circuit is connected in series with the weighting sampling circuit;
the reference comparison circuit collects feedback voltage on the sampling circuit through the voltage division circuit.
Further, the air conditioner is provided with a fan,
the voltage division circuit comprises a first sampling voltage division resistor and a second sampling resistor which are connected in series;
the second end of the first sampling voltage-dividing resistor is connected with the first end of the second sampling voltage-dividing resistor;
the second end of the first weighting sampling branch circuit and the second end of the second weighting sampling branch circuit are connected in parallel and then connected with the first end of the first sampling divider resistor.
Further, the air conditioner is provided with a fan,
the second end of the first sampling voltage-dividing resistor is connected with the second port of the reference comparison circuit, and the second end of the second sampling voltage-dividing resistor is connected with the third port of the reference comparison circuit.
Further, the air conditioner is provided with a fan,
the sampling circuit is connected with the second end and the third end of the reference comparison circuit, so that the reference comparison circuit collects feedback voltage through the sampling circuit;
the sampling circuit is connected with the third port of the reference comparison circuit through the output current sampling resistor.
Further, the air conditioner is provided with a fan,
the first end of the sampling circuit is connected with the first port of the DC main power conversion circuit;
the second end of the sampling circuit is connected with the first end of the output current sampling resistor;
the second end of the output current sampling resistor is connected with the third port of the reference comparison circuit;
and the second end of the output current sampling resistor is connected with the second port of the DC main power conversion circuit.
The invention also provides a using method of the redundancy diode differential pressure weighting compensation output voltage feedback circuit, which is used for collecting the feedback voltages of a plurality of mutually redundant DC main power conversion circuits;
and adjusting the output of the DC main power conversion circuit according to the acquired feedback voltage.
According to the redundant diode differential pressure weighting compensation output voltage feedback circuit, the weighting sampling circuit is added on the basis of the common feedback sampling circuit, so that the conduction voltage drop of the redundant diode is sampled, the power output is accurately controlled, and the accuracy of the power output voltage is improved. Furthermore, the output current droop compensation characteristic circuit of the output current sampling resistor automatically compensates the phenomenon that the output voltages of the two power supplies are not completely consistent due to the fact that the power supplies form a discrete device, and the situation that the output current difference of the two power supplies is in a certain range and the output current difference is large cannot occur when the power supplies work in parallel redundancy is ensured to the greatest extent.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 shows a schematic diagram of a single power supply configuration according to the prior art;
FIG. 2 shows a schematic diagram of a redundant power supply configuration according to the prior art;
FIG. 3 shows a schematic diagram of a sampling feedback circuit including a redundant anti-kickback diode according to the prior art;
fig. 4 is a schematic diagram illustrating a configuration of a redundant diode differential pressure weighted compensation output voltage feedback circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a voltage difference weighted compensation output voltage feedback circuit (hereinafter referred to as a voltage feedback circuit) of a redundant diode, which comprises a DC main power conversion circuit, a reference comparison circuit, a sampling circuit and an output redundant reverse-filling prevention diode V, wherein the anode of the output redundant reverse-filling prevention diode V is connected with a first port (an anode output end) of the DC main power conversion circuit, as shown in FIG. 4. The third port (feedback signal input end) of the DC main power conversion circuit is connected with the first port (feedback signal output end) of the reference comparison circuit, the sampling circuit is bridged between the first port of the DC main power conversion circuit and the second port (negative electrode output end) of the DC main power conversion circuit, specifically, the first end of the sampling circuit is connected with the first port of the DC main power conversion circuit, and the second end of the sampling circuit is connected with the negative electrode output end. The sampling circuit is connected with the reference comparison circuit and feeds back the feedback voltage to the reference comparison circuit. The sampling circuit comprises a weighting sampling circuit which is connected with two ends of the redundancy anti-reverse-filling diode in a bridging mode. The reference comparison circuit is used for comparing the feedback voltage with a set reference voltage, outputting a feedback signal to the DC main power conversion circuit, and controlling the DC main power conversion circuit to adjust power output through the feedback signal.
The weighted sampling circuit comprises a first weighted sampling branch circuit and a second weighted sampling branch circuit, wherein the first end of the first weighted sampling branch circuit is connected to the anode of the output redundancy reverse-filling prevention diode V, and the first end of the second weighted sampling branch circuit is connected to the cathode of the output redundancy reverse-filling prevention diode V. The second end of the first weighted sampling branch is connected with the second end of the second weighted sampling branch.
The first weighted sampling branch comprises a first weighted sampling resistor R3 and a first weighted sampling isolation diode V1 which are connected in series. The second weighted sampling branch comprises a second weighted sampling resistor R4 and a second weighted sampling isolation diode V2 which are connected in series. The first weighted sampling resistor R3 is connected with the anode of the output redundant anti-reverse-flow diode V, and the second weighted sampling resistor R4 is connected with the cathode of the output redundant anti-reverse-flow diode V.
The sampling circuit comprises a voltage division circuit, the voltage division circuit is connected with a reference comparison circuit, and the reference comparison circuit acquires feedback voltage on the sampling circuit through the voltage division circuit. The voltage division circuit comprises a first sampling voltage division resistor R1 and a second sampling resistor R2 which are connected in series. The second end of the first sampling voltage-dividing resistor R1 is connected with the first end of the second sampling voltage-dividing resistor R2.
The voltage division circuit is connected in series with the weighted sampling circuit. And the second end of the first weighting sampling branch circuit and the second end of the second weighting sampling branch circuit are connected in parallel and then are connected with the voltage division circuit. Specifically, the second end of the first weighted sampling branch and the second end of the second weighted sampling branch are connected in parallel and then connected to the first end of the first sampling voltage-dividing resistor R1.
The second end and the third end of sampling circuit and benchmark comparison circuit are connected, specifically are: the second end of the first sampling voltage-dividing resistor R1 is connected with the second port of the reference comparison circuit, and the second end of the second sampling voltage-dividing resistor R2 is connected with the third port of the reference comparison circuit. The reference comparison circuit collects the feedback voltage through the sampling circuit.
Connection in embodiments of the present invention refers to electrical connection, including direct connection or indirect connection, such as through a conductor or an electronic device.
According to the voltage feedback circuit provided by the embodiment of the invention, the weighted sampling circuit is formed by adding the first weighted sampling resistor R3, the first weighted sampling isolation diode V1, the second weighted sampling resistor R4 and the second weighted sampling isolation diode V2, so that the stability of the output voltage of the output redundancy anti-reverse-flow diode V is ensured, and the power supply is not out of control and output in overvoltage when the output redundancy anti-reverse-flow diode V is broken.
Further, the sampling circuit is connected to a third port of the reference comparator, specifically, the sampling circuit is connected to the third port of the reference comparator through the output current sampling resistor R5. The second end of the sampling circuit is connected with the first end of the output current sampling resistor R5, the second end of the output current sampling resistor R5 is connected with the third port of the reference comparison circuit, and meanwhile, the output current sampling resistor R5 is connected with the second port of the DC main power conversion circuit. By adding the output current sampling resistor R5, the output current is introduced into the voltage feedback loop, so that the output voltage has droop characteristics, the output voltage of the power supply can be automatically adjusted according to the output current, and the output current of each power supply can be uniformly adjusted when a plurality of power supplies are output in parallel.
The embodiment of the invention also provides a using method of the redundant diode differential pressure weighting compensation output voltage feedback circuit, which comprises the following steps: the redundant diode differential pressure weighting compensation output voltage feedback circuit is used for collecting feedback voltages of a plurality of mutually redundant DC main power conversion circuits, the output of the DC main power conversion circuits is adjusted according to the collected feedback voltages, and the mutually redundant DC main power conversion circuits are controlled to carry out current sharing.
Illustratively, if the DC main power conversion circuit is a 24V DC output power supply, when a common feedback circuit is used for redundant parallel operation, and if the no-load output voltages of the two power supplies are 24.1V and 24.05V, respectively, then 20A currents are output in parallel, the output currents of the two power supplies are about 13A and about 7A, respectively, according to the forward conduction characteristics of the redundant diodes. The parallel output voltage is 23.7V.
By adopting the voltage feedback circuit of the embodiment of the invention, the reference comparison circuit adopts a TL431 chip, the second sampling voltage-dividing resistor R2 adopts 2.4k, the first sampling voltage-dividing resistor R1 adopts 20k, R3 and R4 respectively adopt 1k and 200 ohms, and R5 adopts 1 mR. Through the voltage feedback circuit of the embodiment of the invention, when the no-load output voltages of the two power supplies are respectively 24.1V and 24.05V, 20A currents are output in parallel under the same condition, and output current difference adjustment and load adjustment rate compensation can be performed to a certain extent. Tests show that the output currents of the two power supplies are about 11A and about 9A respectively, and the parallel output voltage is 23.8V. The load regulation rate and the flow uniformity are improved to a certain degree. Therefore, the voltage feedback circuit has more accurate guiding significance for the current sharing calculation of the redundant power supply and improves the voltage output precision.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A redundant diode differential pressure weighted compensation output voltage feedback circuit, comprising: the DC main power conversion circuit, the reference comparison circuit, the sampling circuit and the output redundancy reverse-filling prevention diode;
the anode of the output redundancy reverse-filling prevention diode is connected with the first port of the DC main power conversion circuit;
the third port of the DC main power conversion circuit is connected with the first port of the reference comparison circuit;
the sampling circuit is connected between the first port of the DC main power conversion circuit and the second port of the DC main power conversion circuit in a bridging mode;
the sampling circuit is connected with the reference comparison circuit and feeds back the feedback voltage to the reference comparison circuit;
the sampling circuit comprises a weighting sampling circuit which is connected with two ends of the redundancy anti-reverse-filling diode in a bridging mode.
2. The redundant diode differential pressure weighted compensation output voltage feedback circuit of claim 1,
the weighted sampling circuit comprises a first weighted sampling branch and a second weighted sampling branch;
the first end of the first weighting sampling branch circuit is connected with the anode of the output redundancy reverse-filling prevention diode;
the first end of the second weighted sampling branch circuit is connected with the cathode of the output redundant reverse-filling prevention diode;
the second end of the first weighted sampling branch is connected with the second end of the second weighted sampling branch.
3. The redundant diode differential pressure weighted compensation output voltage feedback circuit of claim 2,
the first weighted sampling branch circuit comprises a first weighted sampling resistor and a first weighted sampling isolation diode which are connected in series;
the second weighted sampling branch comprises a second weighted sampling resistor and a second weighted sampling isolation diode which are connected in series;
the first weighted sampling resistor is connected with the anode of the output redundancy reverse-filling prevention diode;
the second weighted sampling resistor is connected with the cathode of the output redundancy reverse-filling prevention diode.
4. The redundant diode differential pressure weighted compensation output voltage feedback circuit of claim 3,
the sampling circuit comprises a voltage division circuit, and the voltage division circuit is connected with the reference comparison circuit;
the voltage division circuit is connected in series with the weighting sampling circuit;
the reference comparison circuit collects feedback voltage on the sampling circuit through the voltage division circuit.
5. The redundant diode differential pressure weighted compensation output voltage feedback circuit of claim 4,
the voltage division circuit comprises a first sampling voltage division resistor and a second sampling resistor which are connected in series;
the second end of the first sampling voltage-dividing resistor is connected with the first end of the second sampling voltage-dividing resistor;
the second end of the first weighting sampling branch circuit and the second end of the second weighting sampling branch circuit are connected in parallel and then connected with the first end of the first sampling divider resistor.
6. The redundant diode differential pressure weighted compensation output voltage feedback circuit of claim 5,
the second end of the first sampling voltage-dividing resistor is connected with the second port of the reference comparison circuit, and the second end of the second sampling voltage-dividing resistor is connected with the third port of the reference comparison circuit.
7. The feedback circuit of any one of claims 1-6, wherein the sampling circuit is connected to the second terminal and the third terminal of the reference comparator circuit, so that the reference comparator circuit collects the feedback voltage through the sampling circuit;
the sampling circuit is connected with the third port of the reference comparison circuit through the output current sampling resistor.
8. The redundant diode differential pressure weighted compensation output voltage feedback circuit of claim 7,
the first end of the sampling circuit is connected with the first port of the DC main power conversion circuit;
the second end of the sampling circuit is connected with the first end of the output current sampling resistor;
the second end of the output current sampling resistor is connected with the third port of the reference comparison circuit;
and the second end of the output current sampling resistor is connected with the second port of the DC main power conversion circuit.
9. The use method of the redundancy diode voltage difference weighting compensation output voltage feedback circuit is characterized in that the redundancy diode voltage difference weighting compensation output voltage feedback circuit according to any one of claims 1 to 8 is used for collecting feedback voltages of a plurality of mutually redundant DC main power conversion circuits;
and adjusting the output of the DC main power conversion circuit according to the acquired feedback voltage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110741721.8A CN113359927A (en) | 2021-06-30 | 2021-06-30 | Output voltage feedback circuit for differential pressure weighted compensation of redundant diode and application method thereof |
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| CN202110741721.8A CN113359927A (en) | 2021-06-30 | 2021-06-30 | Output voltage feedback circuit for differential pressure weighted compensation of redundant diode and application method thereof |
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