CN108512397B - Power supply module, power supply system composed of power supply module and control method of power supply system - Google Patents
Power supply module, power supply system composed of power supply module and control method of power supply system Download PDFInfo
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- CN108512397B CN108512397B CN201810268532.1A CN201810268532A CN108512397B CN 108512397 B CN108512397 B CN 108512397B CN 201810268532 A CN201810268532 A CN 201810268532A CN 108512397 B CN108512397 B CN 108512397B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Voltage And Current In General (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention provides a power supply system composed of power supply modules and a control method of the power supply system, wherein the power supply modules comprise a power conversion circuit, a control circuit, a sampling feedback circuit and a circuit detection circuit, and further at least comprise a comparison control circuit, wherein the power supply system is formed by connecting N power supply modules in parallel, N is a natural number larger than 1, one power supply module is selected as a main module, the other N-1 power supply modules are selected as slave modules, current signals output by the main module are fed back to the slave modules through external connection lines, the slave modules receive the current signals of the main module and compare with own output current, the slave modules realize that the output current is kept the same as the output current of the main module by adjusting own output power, and the purpose of parallel current sharing output of the N power supply modules is realized; all parallel current sharing modules are identical, and the modules can be directly used for parallel current sharing without adding any device or apparatus, so that the circuit design is simplified, and the reliability of the power supply is improved.
Description
Technical field:
the present invention relates to the field of power circuits, and in particular, to a power module, a power system including the power module, and a control method of the power system.
The background technology is as follows:
the generation and development of a large number of electronic equipment systems, especially the wide application of communication, computer and automation equipment, etc., the demands on the use of power supplies are higher and higher, the diversity of the kinds of demands and the demands on power promotion make the parallel connection technology of the power supplies develop rapidly, under the general circumstances, the output stabilized power supplies can not be directly used in parallel connection, and the parallel current sharing technology must be adopted to ensure that each module shares the same load current, otherwise, the parallel connected modules can operate in a light load mode or even in an idle mode, and the parallel connected modules operate in a heavy load mode or even in an overload mode, so that the power supply is extremely easy to damage.
The common parallel current equalizing technology includes a droop method, a slope control method, an external circuit control method, a forced current equalizing method, a master-slave control method and the like, wherein the droop method is to connect resistors in series at the output ends of the parallel power supply modules so as to equalize the output currents of the modules; the slope control method adopts a method for adjusting the resistance value of the output resistor so as to achieve the aim of balancing the output current; the sagging method and the slope control method are both connected with resistors with larger resistance in series at the power output end, and the two methods can cause the output resistors to consume excessive power in the output occasions with larger output power, especially in the output occasions with low voltage and large current, so that the power efficiency is reduced, and meanwhile, the accuracy of the output voltage of the power supply is reduced.
The external circuit control method is to add a current detection circuit outside each unit circuit module to detect the current of the unit circuit module, and the generated feedback signal adjusts the current of each unit module, so that the purpose of current sharing among the unit modules is achieved, and a common bus exists among the unit modules generally. The forced current sharing method is realized by a monitoring module, the monitoring module compares the current of each module with the average current of the system, and then adjusts the voltage of the module to make the current of each module equal to the average current. The external circuit control method and the forced current sharing method both adopt more complex external detection and control circuits, thereby increasing the complexity of the circuit and reducing the reliability of the power supply in a plurality of special environments.
The master-slave control method is a method for controlling other slave power supply modules by adopting a master power supply module, and the working mode uses N power supply modules, wherein one module (a master control unit) works in a constant voltage output mode, the other N-1 power supply modules work in a constant current working mode, and the N-1 power supply modules control the current of themselves through a current error signal of the master control unit, so that the current sharing purpose is realized, the master control unit generally requires a current signal output function, and the other N-1 power supply modules require a current signal receiving function, so that independent master power supply and slave power supply are needed for supplying power to the master power supply module and the slave power supply module, and the complexity of a circuit is increased and the applicability of the power supply is reduced.
Accordingly, there is a need for improvements over the prior art.
Disclosure of Invention
In view of the above, the present invention overcomes the above-mentioned shortcomings, and one of the purposes of the present invention is to provide a power module, and secondly to provide a power system for realizing parallel current sharing output by directly using N power modules in parallel, where N is a natural number greater than 1, and the system does not need any additional devices or apparatuses, and each power module can be used as a master control module or a slave module of the system, so as to simplify the complexity of parallel use of the modules, and meanwhile, the present invention also provides a control method corresponding to the power system.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
the utility model provides a power module, includes isolation power conversion circuit, control circuit, sampling feedback circuit, current detection circuit, its characterized in that: also included are at least 7 terminals: a power input positive Vin, a power input ground GND, a power output positive Vo, a power output ground 0V, an output voltage regulating terminal Trim, a current signal input terminal Sig-and a control output terminal Sig+; at least comprises a comparison control circuit;
the connection relation is as follows: the input end of the isolation power conversion circuit is connected with the power input positive Vin and the power input ground GND, the output end of the isolation power conversion circuit is connected with the power output positive Vo and the power output ground 0V, and one end of the isolation power conversion circuit is connected with the control circuit; the input end of the current detection circuit is connected with the 0V power supply output positive Vo of the power supply output ground, the output end of the current detection circuit is connected with the first input end of the comparison control circuit, the second input end of the comparison control circuit is connected with the current signal input end Sig-, and the output end of the comparison control circuit is connected with the control output end Sig+; the input end of the sampling feedback circuit is connected with the power output positive Vo and the electric end output ground 0V, the output end of the sampling feedback circuit is connected with the output voltage regulating end Trim, and one end of the sampling feedback circuit is also connected with the control circuit;
The functions of each terminal are as follows: a power supply input positive Vin and a power supply output ground GND for inputting a voltage; a power output positive Vo and a power output ground 0V for outputting a voltage; the output voltage adjusting terminal Trim is used for adjusting the output voltage, when the level of the output voltage adjusting terminal Trim is increased, the output voltage of the power supply module is reduced, and conversely, when the level of the output voltage adjusting terminal Trim is reduced, the output voltage of the power supply module is increased; a current signal input Sig-and a control output sig+ for receiving and outputting a voltage signal;
the functions of each circuit are as follows:
sampling feedback circuit: the voltage signal of the output voltage and the voltage regulating end Trim is sampled and fed back to the control circuit;
the control circuit: providing a switch control signal for isolating a power switch of the power conversion circuit;
isolated power conversion circuitry: receiving a command signal of a control circuit, and adjusting output power to obtain corresponding output voltage;
a current detection circuit: detecting the output current of the power supply module in real time and outputting a voltage signal corresponding to the output current;
comparison control circuit: and comparing the voltage of the two input ends and outputting corresponding voltage signals.
As an equivalent replacement of the above scheme, the present invention further provides a power module, including a non-isolated power conversion circuit, a control circuit, a sampling feedback circuit, and a current detection circuit, which is characterized in that: also included are at least 6 terminals: a power input positive Vin, a power ground GND, a power output positive Vo, an output voltage regulating terminal Trim, a current signal input terminal Sig-and a control output terminal Sig+; at least comprises a comparison control circuit;
The connection relation is as follows: the input end of the non-isolated power conversion circuit is connected with the power input positive Vo and the power ground GND, and the output end of the non-isolated power conversion circuit is connected with the power output positive Vo and the control circuit; the input end of the current detection circuit is connected with the power input positive Vo, the output end of the current detection circuit is connected with the first input end of the comparison control circuit, the second input end of the comparison control circuit is connected with the current signal input end Sig-, and the output end of the comparison control circuit is connected with the control output end Sig+; the input end of the sampling feedback circuit is connected with the power output positive Vo and the power input ground GND, the output end of the sampling feedback circuit is connected with the output voltage regulating end Trim, and one end of the sampling feedback circuit is also connected with the control circuit;
the functions of each terminal are as follows: a power supply input positive Vin and a power supply ground GND for inputting a voltage; the power supply output positive Vo is used for outputting voltage; the output voltage adjusting terminal Trim is used for adjusting the output voltage, when the level of the output voltage adjusting terminal Trim is increased, the output voltage of the power supply module is reduced, and conversely, when the level of the output voltage adjusting terminal Trim is reduced, the output voltage of the power supply module is increased; a current signal input Sig-and a control output sig+ for receiving and outputting a voltage signal;
The functions of each circuit are as follows:
sampling feedback circuit: sampling the output voltage and the voltage signal of the Trim pin of the output voltage regulating end and feeding back to the control circuit;
the control circuit: providing a switch control signal for a power switch of the non-isolated power conversion circuit;
non-isolated power conversion circuitry: receiving a control signal of a control circuit, and regulating output power to obtain corresponding output voltage;
a current detection circuit: detecting the output current of the power supply module in real time and outputting a voltage signal corresponding to the output current; comparison control circuit: and comparing the voltage of the two input ends and outputting corresponding voltage signals.
Preferably, the comparison control circuit includes: the comparator Q1, the first resistor R1, the second resistor R2, the third resistor R3 and the first capacitor C1; the first input end of the comparator Q1 is connected with the current detection circuit through a third resistor R3, the second input end of the comparator Q1 is connected with the output end of the comparator Q1 through a first capacitor C1, the second input end of the comparator Q1 is connected with the current signal input end Sig-through a second resistor R2, and the output end of the comparator Q1 is connected with the control output end Sig+ through a first resistor R1.
Preferably, the comparison control circuit includes: the comparator Q1, the first resistor R1, the second resistor R2, the third resistor R3 and the first capacitor C1; the first input end of the comparator Q1 is connected with the current detection circuit through a third resistor R3, the second input end of the comparator Q1 is connected with the current signal input end Sig-through a second resistor R2, the output end of the comparator Q1 is connected with the control output end Sig+ through a first resistor R1, and the output end of the comparator Q1 is connected with the current signal input end Sig-through a first capacitor C1.
Preferably, the comparison control circuit includes: the comparator Q1, the first resistor R1, the second resistor R2, the third resistor R3 and the first capacitor C1; the first input end of the comparator Q1 is connected with the current detection circuit through a third resistor R3, the second input end of the comparator Q1 is connected with the current signal input end Sig-through a second resistor R2, the second input end of the comparator Q1 is connected with the control output end Sig+ through a first capacitor C1, and the output end of the comparator Q1 is connected with the control output end Sig+ through a first resistor R1.
As an improvement of the above scheme, the comparison control circuit further includes a fourth resistor, and the fourth resistor is connected in series with the first capacitor C1.
As another improvement of the above scheme, the comparison control circuit further includes a fourth resistor and a second capacitor connected in series to form an RC circuit, and the RC circuit is connected in parallel to two ends of the first capacitor C1.
A power supply system comprises N power supply modules according to the technical scheme, wherein N is a natural number greater than 1; any one of the power supply modules is selected as a main module of the system, the rest N-1 power supply modules are selected as slave modules of the system, and the connection method is as follows: the power output positive Vo of the N power modules are connected and then used as a power output positive terminal of the system; the power output grounds 0V of the N power modules are connected and then used as power output ground terminals of the system; the current signal input end Sig of the main module is connected with the control output end Sig+ of the main module and is connected with the current signal input ends Sig of the other N-1 slave modules; the output voltage regulating end Trim of the main module is used as an output voltage regulating end of the system; the control output ends Sig+ of the N-1 slave modules are connected with the output voltage regulating ends Trim.
A power supply system comprises N power supply modules according to the technical scheme, wherein N is a natural number greater than 1; any one of the power supply modules is selected as a main module of the system, the rest N-1 power supply modules are selected as slave modules of the system, and the connection method is as follows: the power output positive Vo of the N power modules are connected and then used as a power output positive terminal of the system, and the power ground GND of the N power modules are connected and then used as a power output ground terminal and a power output ground terminal of the system; the circuit signal input end Sig of the main module is connected with the control output end Sig of the main module and is connected with the current signal input ends Sig of the other N-1 slave modules; the output voltage regulating end of the main module is used as the voltage regulating end of the system, and the control output ends Sig+ of the N-1 slave modules are connected with the output voltage regulating ends Trim.
The control method of the power supply system according to the technical scheme comprises the following steps: when the output current of the slave module is larger than that of the master module, the Trim level of the output voltage regulating end of the slave module is increased, the sampling feedback circuit of the slave module samples the high level signal and feeds the signal back to the control circuit of the slave module, the control circuit of the slave module receives the high level signal, generates a control signal and sends the control signal to the isolated power conversion circuit of the slave module or the non-isolated power conversion circuit of the slave module, and drives the isolated power conversion circuit of the slave module or the non-isolated power conversion circuit of the slave module to reduce the output power of the slave module, so that the output voltage of the slave module is reduced, and the output current of the slave module is reduced; when the output current of the slave module is smaller than that of the master module, the Trim level of the output voltage regulating end of the slave module is reduced, the sampling feedback circuit of the slave module samples the low level signal, the signal is fed back to the control circuit of the slave module, the control circuit of the slave module receives the low level signal, generates a control signal to the isolated power conversion circuit of the slave module or the non-isolated power conversion circuit of the slave module, and drives the isolated power conversion circuit of the slave module or the non-isolated power conversion circuit of the slave module to increase the output power of the slave module, so that the output voltage of the slave module is increased, and the output current of the slave module is increased.
The invention has the beneficial effects that:
1. the main module is identical to the auxiliary module, and a power module can be selected as the main module when in use, namely, the normalization of the main module and the auxiliary module is realized;
2. the power module does not need to add any device outside, and the parallel current sharing purpose can be achieved only by changing an external connection mode;
3. because the output end of the main module has stronger output capability, a plurality of modules can be used in parallel at the same time;
4. when the parallel current sharing is used, the output voltage regulating end of the main module can be used continuously, namely, the power supply system after parallel connection maintains the original output voltage regulating function.
Drawings
FIG. 1 is a schematic block diagram of a power module according to a first embodiment of the present invention;
FIG. 2 is a schematic block diagram of a power module according to a second embodiment of the present invention;
FIG. 3 is a schematic diagram showing a parallel connection system formed by N power modules according to a first embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a parallel connection system formed by N power modules according to a second embodiment of the present invention;
FIG. 5 is a schematic diagram of a single power module according to a first embodiment of the present invention;
FIG. 6 is a schematic diagram of a single power module according to a second embodiment of the present invention;
FIG. 7 is a schematic diagram of a dual power module parallel power system according to a first embodiment of the present invention;
Fig. 8 is a schematic diagram of a parallel power supply system with dual power modules according to a second embodiment of the present invention.
Detailed Description
The technical concept of the invention is to provide a power supply technical scheme, which is characterized in that N power supply modules are directly connected in parallel for use, N is a natural number larger than 1, one power supply module is selected as a main module, the other N-1 power supply modules are selected as auxiliary modules, the current signal input ends of all the auxiliary modules are connected to the control output end of the main module and the current signal input end of the main module, the main module feeds back the output current signal to the auxiliary modules, the auxiliary modules receive the current signal of the main module and compare the current signal with the current signal output by the auxiliary modules, the output current of the auxiliary modules is identical to the output current of the main module by adjusting the output power of the auxiliary modules, and the N power supply circuit modules are connected in parallel for current equalizing output.
In order that the invention may be more readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
First embodiment
Fig. 1 is a schematic block diagram of a power module according to a first embodiment of the present invention, where the power module includes:
Comprising at least 7 terminals: a power input positive Vin, a power input ground GND, a power output positive Vo, a power output ground 0V, an output voltage regulating terminal Trim, a current signal input terminal Sig-and a control output terminal Sig+;
the unit circuit further includes: an isolated power conversion circuit, a control circuit, a current detection circuit, a sampling control circuit and a comparison control circuit,
the connection relation is as follows: the input end of the isolation power conversion circuit is connected with the power input positive Vin and the power input ground GND, the output end of the isolation power conversion circuit is connected with the power output positive Vo and the power output ground 0V, and one end of the isolation power conversion circuit is connected with the control circuit; the input end of the current detection circuit is connected with the 0V output by the power supply, the output end of the current detection circuit is connected with the first input end of the comparison control circuit, the second input end of the comparison control circuit is connected with the current signal input end Sig-, and the output end of the comparison control circuit is connected with the control output end Sig+; the input end of the sampling feedback circuit is connected with the power output positive Vo and the electric end output ground 0V, the output end of the sampling feedback circuit is connected with the output voltage regulating end Trim, and one end of the sampling feedback circuit is also connected with the control circuit.
The functions of each terminal are as follows: a power supply input positive Vin and a power supply output ground GND for inputting a voltage; a power output positive Vo and a power output ground 0V for outputting a voltage; the output voltage adjusting terminal Trim is used for adjusting the output voltage, when the level of the output voltage adjusting terminal Trim is increased, the output voltage of the power supply module is reduced, and conversely, when the level of the output voltage adjusting terminal Trim is reduced, the output voltage of the power supply module is increased; a current signal input Sig-and a control output sig+ for receiving and outputting a current signal;
The functions of each circuit are as follows:
sampling feedback circuit: sampling the output voltage and the voltage signal of the adjusting terminal Trim and feeding back to the control circuit;
the control circuit: providing a switch control signal for isolating a power switch of the power conversion circuit;
isolated power conversion circuitry: receiving a control signal of a control circuit, and regulating output power to obtain corresponding output voltage;
a current detection circuit: detecting the output current of the power supply module in real time and outputting a voltage signal corresponding to the output current;
comparison control circuit: and comparing the voltage of the two input ends and outputting corresponding voltage signals.
Fig. 5 is a schematic diagram of an internal circuit of the power module according to the embodiment, in which:
comparison control circuit 1: the device consists of a comparator Q1, a first resistor R1, a second resistor R2, a third resistor R3 and a first capacitor C1; the first input end of the comparator Q1 is connected with the current detection circuit through a third resistor R3, the second input end of the comparator Q1 is connected with the output end of the comparator Q1 through a first capacitor C1, the second input end of the comparator Q1 is connected with the current signal input end Sig-through a second resistor R2, and the output end of the comparator Q1 is connected with the control output end Sig+ through a first resistor R1.
The other connection relation of the comparison control circuit is as follows: the first input end of the comparator Q1 is connected with the current detection circuit through a third resistor R3, the second input end of the comparator Q1 is connected with the current signal input end Sig-through a second resistor R2, the output end of the comparator Q1 is connected with the control output end Sig+ through a first resistor R1, and the output end of the comparator Q1 is connected with the current signal input end Sig-through a first capacitor C1.
The comparison control circuit may have another connection relationship: the first input end of the comparator Q1 is connected with the current detection circuit through a third resistor R3, the second input end of the comparator Q1 is connected with the current signal input end Sig-through a second resistor R2, the second input end of the comparator Q1 is connected with the control output end Sig+ through a first capacitor C1, and the output end of the comparator Q1 is connected with the control output end Sig+ through a first resistor R1.
The embodiments of the three comparison control circuits described above can also be modified, an improvement: the comparison control circuit further comprises a fourth resistor, the fourth resistor is connected with the first capacitor C1 in series, and the positions of the fourth resistor and the first capacitor C1 in the circuit can be interchanged according to the series characteristic; another improvement is that: the comparison control circuit also comprises an RC circuit formed by serially connecting the fourth resistor and the second capacitor, the RC circuit is connected in parallel at two ends of the first capacitor C1, and according to the serial characteristic, the positions of the fourth resistor and the second capacitor in the circuit can be interchanged, and the specific connection mode is not described again.
Current detection circuit 2: the power supply circuit comprises a comparator Q2, a resistor R4, a resistor R5 and a resistor R6, wherein a first output end of the comparator Q2 is connected with one output end of an isolation power conversion circuit through the resistor R5, a first input end of the comparator Q2 is connected with a power supply output ground 0V through the resistor R5 and the resistor R6, a second input end of the comparator Q2 is connected with the power supply output ground 0V, an output end of the comparator Q2 is connected with a first input end of a comparison control circuit, and an output end of the comparator Q2 is connected with a first input end of the comparator Q2 through the resistor R4.
The working principle is as follows: the output current of the power supply module passes through the resistor R6, voltage is formed at two ends of the resistor R6, the resistor R4, the resistor R5 and the comparator Q2 form an in-phase amplifier according to the connection relation, and after the voltage at two ends of the resistor R6 is amplified by the in-phase amplifier, a voltage signal corresponding to the output current of the power supply module is formed and output at the output end of the comparator Q2.
Sampling feedback circuit 3: the LED light source comprises TL431, an optocoupler input diode OA, an optocoupler output triode OB, a resistor R7, a resistor R8, a resistor R9 and a resistor R10; the power output positive Vo is connected with the cathode of the TL431 through an optocoupler input diode QA and a resistor R7, and the anode of the TL431 is connected with the power output ground 0V; the power supply output positive Vo is connected with the reference end of the TL431 through a resistor R8; the output voltage regulating terminal Trim is connected with a reference terminal of the TL431 through a resistor R10; the reference end of TL431 is connected with the power output ground 0V through a resistor R9; and the collector and the emitter of the triode QB at the output end of the optocoupler are respectively connected with a control circuit.
In the figure, an output voltage adjusting end Trim of the power supply module has an up-down adjusting function on the output voltage of the power supply module, and the working principle is as follows:
when the Trim voltage of the output voltage adjusting terminal rises, the current flowing from the Trim terminal to the reference terminal of the TL431 through the resistor R10 increases, so that the current flowing through the resistor R9 increases, the voltage of the reference terminal of the TL431 rises, the cathode current of the TL431 increases according to the characteristics of the TL431, namely, the current flowing through the resistor R7 and the optocoupler input diode QA increases, so that the current of the optocoupler output three-stage QB increases, the output power of the drive isolation power conversion circuit is reduced under the control of the control circuit, and the purpose of reducing the output voltage is achieved. Therefore, when the Trim voltage of the output voltage adjusting terminal rises, the power output voltage of the power module decreases. In contrast, when the voltage of the output voltage adjusting terminal Trim is reduced, the output voltage of the power supply module is increased through a series of actions of the resistor R10, the resistor R8, the resistor R9, the controllable precise voltage stabilizing source TL431, the resistor R7, the optocoupler input diode QA, the optocoupler output triode QB, the control circuit and the isolated power conversion circuit, so that the output voltage adjusting function of the output voltage adjusting terminal Trim of the power supply circuit module is realized.
Fig. 3 is a connection mode of N power modules of the present embodiment connected in parallel to form a power system, wherein any one of the power modules is selected as a master module of the system, and the remaining N-1 power modules are selected as slave modules of the system, and the connection method thereof is as follows: the power output positive Vo of the N power modules are connected and then used as a power output positive terminal of the system; the power output grounds 0V of the N power modules are connected and then used as power output ground terminals of the system; the current signal input end Sig of the main module is connected with the control output end Sig+ of the main module and is connected with the current signal input ends Sig of the other N-1 slave modules; the output voltage regulating end Trim of the main module is used as an output voltage regulating end of the system; the control output ends Sig+ of the N-1 slave modules are connected with the output voltage regulating ends Trim.
The power system formed by connecting the two power modules in parallel can be realized by adopting the pin wiring mode of fig. 7, wherein one power module is selected as a main module; the other power module acts as a slave. When the parallel structure of the parallel current-sharing power supply system generalized to N power supply circuit modules is shown in fig. 3, one power supply module can be selected as a master module, and the other N-1 power supply modules can be selected as slave modules. The main working principle of the power supply system formed by the double power supply modules is explained as follows:
One of the power supply modules is selected as a main module of the system, the other power supply module is selected as a slave module of the system, the internal structures of the main module and the slave module are the same, and the connection relation of the power supply module and the slave module is shown in fig. 5 and 7:
the power output positive Vo1 of the master module is connected with the power output positive Vo2 of the slave module and serves as a power output positive terminal of the power system; the power output ground 0V1 of the master module is connected with the power output ground 0V2 of the slave module and is used as a power output ground terminal of the power supply system; the output voltage regulating terminal Trim of the main module is used as an output voltage regulating terminal of the system; the master module current signal input end Sig-1 is connected with the control output end Sig+1 and is connected with the current signal input end Sig-2 of the slave module; the control output end Sig+2 of the slave module is connected with the output voltage regulating end Trim 2.
For the main module: the second input end of the comparator Q1 in the main module is connected to the output end of the comparator Q1 in the main module through a second resistor R2, a circuit signal input end Sig-1, a control output end Sig+1 and a first resistor R1 in the main module, and the voltage of the output end of the comparator Q1 in the main module is fed back to the second input end of the comparator in the main module through the first resistor R1, the control output end Sig+1, the circuit signal input end Sig-1 and the second resistor R2 in the main module; when the voltage at the output terminal of the comparator Q1 inside the main module is higher than the voltage at the first input terminal of the comparator Q1 inside the main module, that is, the voltage at the second input terminal of the comparator Q1 inside the main module is higher than the voltage at the first input terminal of the comparator Q1 inside the main module, the voltage at the output terminal of the comparator Q1 inside the main module decreases, and conversely, when the voltage at the output terminal of the comparator Q1 inside the main module, that is, the voltage at the second input terminal of the comparator Q1 inside the main module is lower than the voltage at the first input terminal of the comparator Q1 inside the main module, the voltage at the output terminal of the comparator Q1 inside the main module increases, which forms negative feedback. At this time, the comparator Q1 in the main module, the first resistor R1 in the main module, the control output terminal sig+1, and the second resistor R2 in the circuit signal input terminal Sig-1 form a voltage follower, i.e. the voltage at the output terminal of the comparator Q1 in the main module is kept the same as the voltage at the first input terminal of the comparator in the main module. According to the above connection, the first input terminal of the comparator in the main block is connected to the current detection circuit 2 through the third resistor R3 in the main block, and the input impedance of the first input terminal of the comparator Q1 in the main block is very small, so that the voltage of the first input terminal of the comparator Q1 in the main block can be regarded as the same as the output voltage of the current detection circuit 2 in the main block, and therefore the control output terminal voltage of the main block is equal to the output voltage of the current detection circuit 2 in the main block, and the output voltage of the current detection circuit 2 in the main block reflects the output current of the main block.
For the slave module: the current signal input end Sig-2 of the slave module is connected with the second input end of the comparator inside the slave module through the second resistor inside the slave module, and the input impedance of the second input end of the comparator inside the slave module is large, so that the input current is negligible, the voltage of the second input end of the comparator inside the slave module is equal to the voltage of the current signal input end Sig-2 of the slave module, and the voltage of the second input end of the comparator inside the slave module is equal to the voltage of the control output end Sig+1 of the master module and is also equal to the output voltage of the current detection circuit 2 inside the master module according to the connection relation of the master module and the slave module; according to the connection relation, the first input end of the comparator inside the slave module is connected with the current detection circuit 5 inside the slave module through the third resistor inside the slave module, and the voltage of the first input end of the comparator inside the slave module is equal to the output voltage of the current detection circuit 5 inside the slave module. At this time, the voltage at the first input end of the comparator inside the slave module reflects the output current of the slave module, the voltage at the second input end of the comparator inside the slave module reflects the output current of the master module, and when the output current of the slave module is greater than the output current of the master module, the voltage at the comparison output end of the comparator inside the slave module increases, namely the voltage at the control output end Sig+2 of the slave module increases; conversely, when the slave output current is less than the master current, the voltage at the comparison output of the comparator internal to the slave will drop, i.e., the voltage at the slave control output sig+2 will drop.
For master and slave modules: the control output end Sig+2 of the slave module is connected with the output voltage regulating end Trim2, when the output current of the slave module is larger than the output current of the master module, the voltage of the output voltage regulating end Trim2 of the slave module is increased, and when the voltage of the output voltage regulating end Trim2 of the slave module is increased, the output voltage of the slave module is reduced, and the output current of the slave module is reduced because the power output ends of the master module and the slave module are connected in parallel; in contrast, when the output current of the slave module is smaller than the output current of the master module, the voltage of the output voltage regulating end Trim2 of the slave module is reduced, and similarly, when the voltage of the output voltage regulating end of the slave module is reduced, the output voltage of the slave module is increased, and the output current of the slave module is increased due to the fact that the power output ends of the master module and the slave module are connected in parallel.
By summarizing the working principle, the slave module can compare the self output current with the output current of the master module, and the comparison result is used for adjusting the self output current of the slave module to form negative feedback, so that the purpose that the output current of the slave module is the same as that of the master module is achieved. It should be noted that when N parallel current-sharing power supply circuit modules are selected, one power supply circuit module is selected as a master module, and the other N-1 power supply circuit modules are selected as slave modules, and the working process principle and the implemented functions are consistent with those described above, which will not be described again.
Second embodiment
As shown in fig. 2, which is a schematic block diagram of the second embodiment, it can be seen from the figure: the power module includes at least 6 terminals: a power input positive Vin, a power ground GND, a power output positive Vo, an output voltage regulating terminal Trim, a current signal input terminal Sig-and a control output terminal Sig+;
further comprises: non-isolated power conversion circuit, control circuit, current detection circuit, comparison control circuit: the connection relation is as follows: the input end of the non-isolated power conversion circuit is connected with the power input positive Vo and the power ground GND, and the output end of the non-isolated power conversion circuit is connected with the power output positive Vo and the control circuit; the input end of the current detection circuit is connected with the power input positive Vo, the output end of the current detection circuit is connected with the first input end of the comparison control circuit, the second input end of the comparison control circuit is connected with the current signal input end Sig-, and the output end of the comparison control circuit is connected with the control output end Sig+; the input end of the sampling feedback circuit is connected with the power output positive Vo and the power input ground GND, the output end of the sampling feedback circuit is connected with the output voltage regulating end Trim, and one end of the sampling feedback circuit is also connected with the control circuit;
the functions of each terminal are as follows: a power supply input positive Vin and a power supply ground GND for inputting a voltage; the power supply output positive Vo is used for outputting voltage; the output voltage adjusting terminal Trim is used for adjusting the output voltage, when the level of the output voltage adjusting terminal Trim is increased, the output voltage of the power supply module is reduced, and conversely, when the level of the output voltage adjusting terminal Trim is reduced, the output voltage of the power supply module is increased; a current signal input Sig-and a control output sig+ for receiving and outputting a current signal;
The functions of each circuit are as follows:
sampling feedback circuit: sampling the output voltage and the voltage signal of the adjusting terminal Trim and feeding back to the control circuit;
the control circuit: providing a switch control signal for a power switch of the non-isolated power conversion circuit;
non-isolated power conversion circuitry: receiving a control signal of a control circuit, and regulating output power to obtain output voltage;
a current detection circuit: detecting the output current of the power supply module in real time and outputting a voltage signal corresponding to the output current; comparison control circuit: and comparing the voltage of the two input ends and outputting corresponding voltage signals.
Fig. 6 is a schematic diagram of a power module according to the present embodiment, as can be seen from the figure:
the circuit structures of the comparison control circuit 7 and the current detection circuit 8 of the present embodiment are the same as those of the comparison control circuit 1 and the current detection circuit 2 of the first embodiment, the connection relationship between the current detection circuit 7 and the comparison control circuit 8 of the present embodiment is the same as that between the comparison control circuit 1 and the current measurement circuit 2 of the first embodiment, the operation principle of the current detection circuit 8 of the present embodiment is the same as that of the original description of the circuit measurement circuit 2 of the first embodiment, and the circuit improvement scheme for the comparison control circuit 1 in the first embodiment is also applicable to the comparison control circuit 8 of the present embodiment, and will not be described again.
The sampling feedback circuit 9 is composed of a resistor R8, a resistor R9 and a resistor R10, wherein the power output positive Vo is connected to the control circuit through the resistor R8, the power ground GND is connected to the control circuit through a ninth resistor R9, and the output voltage regulating end Trim is connected to the control circuit through a tenth resistor R10.
As an aspect of this embodiment, the power module further includes a comparator power supply circuit, where the comparator power supply circuit is connected to the comparison control circuit 7 and the current detection circuit 8, and provides an operating voltage for the comparison control circuit 7 and the current detection circuit 8.
Obviously, the working principle and the function of the output voltage adjusting terminal Trim of the embodiment are the same as those of the first embodiment, the resistor R8 and the resistor R9 are sampling resistors of the output voltage adjusting terminal Trim of the power supply module, the resistor R8 and the resistor R9 are serially connected to divide the voltage, and the divided voltage signal is provided to the control circuit. This is also provided with the control logic that the output voltage regulating terminal Trim should have in the first embodiment.
Fig. 4 shows a connection manner of N power modules in parallel connection system of this embodiment, where N is a natural number greater than 1, and the connection relationship is as follows: the power output positive Vo of the N power modules are connected and then used as a power output positive terminal of the system, and the power ground GND of the N power modules are connected and then used as a system power input ground terminal and a power output ground terminal; the circuit signal input end Sig of the main module is connected with the control output end Sig of the main module and is connected with the current signal input ends Sig of the other N-1 slave modules; the output voltage regulating end of the main module is used as the voltage regulating end of the system, and the control output ends Sig+ of the N-1 slave modules are connected with the output voltage regulating ends Trim.
Fig. 8 is a connection manner of the dual power module parallel system of the present embodiment, wherein one of the circuit modules is selected as a master module of the system, and the other power module is a slave module, and the connection relationship is as follows: the power output positive Vo1 of the master module is connected with the power output positive Vo2 of the slave module and serves as a power output positive terminal of the power system; the power input ground GND1 of the master module and the power input ground GND2 of the slave module are connected as a power input ground terminal and a power output ground terminal of the system; the output voltage regulating terminal Trim of the main module is used as an output voltage regulating terminal of the system; the master module current signal input end Sig-1 is short-circuited with the control output end Sig+1 and is connected with the current signal input end Sig-2 of the slave module; the control output end Sig+2 of the slave module is short-circuited with the output voltage regulating end Trim 2.
The working principle of the two power supply modules for realizing parallel current sharing is the same as that of the first embodiment, and will not be described again.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that the above-mentioned preferred embodiment should not be construed as limiting the invention, and that modifications and alterations can be made by those skilled in the art without departing from the spirit and scope of the invention, which is also regarded as the protection scope of the invention, which is defined by the claims.
Claims (14)
1. The utility model provides a power module, includes isolation power conversion circuit, control circuit, sampling feedback circuit, current detection circuit, its characterized in that: also included are at least 7 terminals: a power input positive Vin, a power input ground GND, a power output positive Vo, a power output ground 0V, an output voltage regulating terminal Trim, a current signal input terminal Sig-and a control output terminal Sig+; at least comprises a comparison control circuit;
the connection relation is as follows: the input end of the isolation power conversion circuit is connected with the power input positive Vin and the power input ground GND, the output end of the isolation power conversion circuit is connected with the power output positive Vo and the power output ground 0V, and one end of the isolation power conversion circuit is connected with the control circuit; the input end of the current detection circuit is connected with the power supply output ground 0V or the power supply output positive Vo, the output end of the current detection circuit is connected with the first input end of the comparison control circuit, the second input end of the comparison control circuit is connected with the current signal input end Sig-, and the output end of the comparison control circuit is connected with the control output end Sig+; the input end of the sampling feedback circuit is connected with the power output positive Vo and the electric end output ground 0V, the output end of the sampling feedback circuit is connected with the output voltage regulating end Trim, and one end of the sampling feedback circuit is also connected with the control circuit;
The functions of each terminal are as follows: a power input positive Vin and a power input ground GND for inputting a voltage; a power output positive Vo and a power output ground 0V for outputting a voltage; the output voltage adjusting terminal Trim is used for adjusting the output voltage, when the level of the output voltage adjusting terminal Trim is increased, the output voltage of the power supply module is reduced, and conversely, when the level of the output voltage adjusting terminal Trim is reduced, the output voltage of the power supply module is increased; a current signal input Sig-and a control output sig+ for receiving and outputting a voltage signal;
the functions of each circuit are as follows:
sampling feedback circuit: sampling the output voltage and a voltage signal of an output voltage regulating terminal Trim and feeding back the sampled voltage signal to a control circuit;
the control circuit: providing a switch control signal for isolating a power switch of the power conversion circuit;
isolated power conversion circuitry: receiving a command signal of a control circuit, and adjusting output power to obtain corresponding output voltage;
a current detection circuit: detecting the output current of the power supply module in real time and outputting a voltage signal corresponding to the output current;
comparison control circuit: and comparing the voltage of the two input ends and outputting corresponding voltage signals.
2. The utility model provides a power module, includes non-isolated power conversion circuit, control circuit, sampling feedback circuit, current detection circuit, its characterized in that: also included are at least 6 terminals: a power input positive Vin, a power ground GND, a power output positive Vo, an output voltage regulating terminal Trim, a current signal input terminal Sig-and a control output terminal Sig+; at least comprises a comparison control circuit;
The connection relation is as follows: the input end of the non-isolated power conversion circuit is connected with the power input positive Vo and the power ground GND, and the output end of the non-isolated power conversion circuit is connected with the power output positive Vo and the control circuit; the input end of the current detection circuit is connected with the power input positive Vo, the output end of the current detection circuit is connected with the first input end of the comparison control circuit, the second input end of the comparison control circuit is connected with the current signal input end Sig-, and the output end of the comparison control circuit is connected with the control output end Sig+; the input end of the sampling feedback circuit is connected with the power output positive Vo and the power input ground GND, the output end of the sampling feedback circuit is connected with the output voltage regulating end Trim, and one end of the sampling feedback circuit is also connected with the control circuit;
the functions of each terminal are as follows: a power supply input positive Vin and a power supply ground GND for inputting a voltage; the power supply output positive Vo is used for outputting voltage; the output voltage adjusting terminal Trim is used for adjusting the output voltage, when the level of the output voltage adjusting terminal Trim is increased, the output voltage of the power supply module is reduced, and conversely, when the level of the output voltage adjusting terminal Trim is reduced, the output voltage of the power supply module is increased; a current signal input Sig-and a control output sig+ for receiving and outputting a current signal;
The functions of each circuit are as follows:
sampling feedback circuit: sampling the output voltage and the voltage signal of the adjusting terminal Trim and feeding back to the control circuit;
the control circuit: providing a switch control signal for a power switch of the non-isolated power conversion circuit;
non-isolated power conversion circuitry: receiving a control signal of a control circuit, and regulating output power to obtain corresponding output voltage;
a current detection circuit: detecting the output current of the power supply module in real time and outputting a voltage signal corresponding to the output current;
comparison control circuit: and comparing the voltage of the two input ends and outputting corresponding voltage signals.
3. The power module of claim 1 or 2, wherein: the comparison control circuit includes: the comparator Q1, the first resistor R1, the second resistor R2, the third resistor R3 and the first capacitor C1; the first input end of the comparator Q1 is connected with the current detection circuit through a third resistor R3, the second input end of the comparator Q1 is connected with the output end of the comparator Q1 through a first capacitor C1, the second input end of the comparator Q1 is connected with the current signal input end Sig-through a second resistor R2, and the output end of the comparator Q1 is connected with the control output end Sig+ through a first resistor R1.
4. The power module of claim 1 or 2, wherein: the comparison control circuit includes: the comparator Q1, the first resistor R1, the second resistor R2, the third resistor R3 and the first capacitor C1; the first input end of the comparator Q1 is connected with the current detection circuit through a third resistor R3, the second input end of the comparator Q1 is connected with the current signal input end Sig-through a second resistor R2, the output end of the comparator Q1 is connected with the control output end Sig+ through a first resistor R1, and the output end of the comparator Q1 is connected with the current signal input end Sig-through a first capacitor C1.
5. The power module of claim 1 or 2, wherein: the comparison control circuit includes: the comparator Q1, the first resistor R1, the second resistor R2, the third resistor R3 and the first capacitor C1; the first input end of the comparator Q1 is connected with the current detection circuit through a third resistor R3, the second input end of the comparator Q1 is connected with the current signal input end Sig-through a second resistor R2, the second input end of the comparator Q1 is connected with the control output end Sig+ through a first capacitor C1, and the output end of the comparator Q1 is connected with the control output end Sig+ through a first resistor R1.
6. A power module according to claim 3, characterized in that: the capacitor also comprises a fourth resistor which is connected with the first capacitor C1 in series.
7. The power module of claim 4, wherein: the capacitor also comprises a fourth resistor which is connected with the first capacitor C1 in series.
8. The power module of claim 5, wherein: the capacitor also comprises a fourth resistor which is connected with the first capacitor C1 in series.
9. A power module according to claim 3, characterized in that: the third resistor and the second capacitor are connected in series to form an RC circuit, and the RC circuit is connected in parallel to two ends of the first capacitor C1.
10. The power module of claim 4, wherein: the third resistor and the second capacitor are connected in series to form an RC circuit, and the RC circuit is connected in parallel to two ends of the first capacitor C1.
11. The power module of claim 5, wherein: the third resistor and the second capacitor are connected in series to form an RC circuit, and the RC circuit is connected in parallel to two ends of the first capacitor C1.
12. A power supply system comprising N power supply modules of claim 1, N being a natural number greater than 1; any one of the power supply modules is selected as a main module of the system, the rest N-1 power supply modules are selected as slave modules of the system, and the connection method is as follows: the power output positive Vo of the N power modules are connected and then used as a power output positive terminal of the system; the power output grounds 0V of the N power modules are connected and then used as power output ground terminals of the system; the current signal input end Sig of the main module is connected with the control output end Sig+ of the main module and is connected with the current signal input ends Sig of the other N-1 slave modules; the output voltage regulating end Trim of the main module is used as an output voltage regulating end of the system; the control output ends Sig+ of the N-1 slave modules are connected with the output voltage regulating ends Trim.
13. A power supply system comprising N power supply modules of claim 2, N being a natural number greater than 1; any one of the power supply modules is selected as a main module of the system, the rest N-1 power supply modules are selected as slave modules of the system, and the connection method is as follows: the power output positive Vo of the N power modules are connected and then used as a power output positive terminal of the system, and the power ground GND of the N power modules are connected and then used as a power input ground terminal and a power output ground terminal of the system; the circuit signal input end Sig of the main module is connected with the control output end Sig of the main module and is connected with the current signal input ends Sig of the other N-1 slave modules; the output voltage regulating end of the main module is used as the voltage regulating end of the system, and the control output ends Sig+ of the N-1 slave modules are connected with the output voltage regulating ends Trim.
14. A control method of the power supply system according to claim 12 or 13: when the output current of the slave module is larger than that of the master module, the Trim level of the output voltage regulating end of the slave module is increased, the sampling feedback circuit of the slave module samples the high level signal and feeds the signal back to the control circuit of the slave module, the control circuit of the slave module receives the high level signal, generates a control signal and sends the control signal to the isolated power conversion circuit of the slave module or the non-isolated power conversion circuit of the slave module, and drives the isolated power conversion circuit of the slave module or the non-isolated power conversion circuit of the slave module to reduce the output power of the slave module, so that the output voltage of the slave module is reduced, and the output current of the slave module is reduced; when the output current of the slave module is smaller than that of the master module, the Trim level of the output voltage regulating end of the slave module is reduced, the sampling feedback circuit of the slave module samples the low level signal, the signal is fed back to the control circuit of the slave module, the control circuit of the slave module receives the low level signal, generates a control signal to the isolated power conversion circuit of the slave module or the non-isolated power conversion circuit of the slave module, and drives the isolated power conversion circuit of the slave module or the non-isolated power conversion circuit of the slave module to increase the output power of the slave module, so that the output voltage of the slave module is increased, and the output current of the slave module is increased.
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| CN112612355A (en) * | 2020-12-03 | 2021-04-06 | 苏州浪潮智能科技有限公司 | Hardware current sharing device and working method thereof |
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