CN115242059B

CN115242059B - Multi-power-supply parallel current output device and method and electronic equipment

Info

Publication number: CN115242059B
Application number: CN202211149053.0A
Authority: CN
Inventors: 汪婉君; 陈伟; 白瑞林
Original assignee: Shenzhen Injoinic Technology Co Ltd
Current assignee: Shenzhen Injoinic Technology Co Ltd
Priority date: 2022-09-21
Filing date: 2022-09-21
Publication date: 2023-02-28
Anticipated expiration: 2042-09-21
Also published as: WO2024060494A1; CN115242059A

Abstract

The application provides a multi-power-supply parallel current output device, a multi-power-supply parallel current output method and electronic equipment, wherein the device comprises: a plurality of parallel connection's a plurality of power module, every power module is connected with voltage output, and each voltage input end is connected respectively to every power module, and this arbitrary proportion output device of multichannel power parallel current can also include: the two ends of the plurality of detection resistors are respectively connected with the two detection ports of the plurality of power supply modules, one ends of the plurality of detection resistors are also connected with one end of the load, the other ends of the plurality of detection resistors are grounded, and the other end of the load is connected with the voltage output end; the output end of the voltage controller is connected with the voltage output end. The method and the device have the advantage of high reliability.

Description

Multi-power-supply parallel current output device and method and electronic equipment

Technical Field

The invention relates to the field of electronic equipment, in particular to a multi-path power supply parallel current output device and method and electronic equipment.

Background

The high-power load power supply is more and more required in the existing market, and for the requirement of the high-power load power supply, a scheme is that a plurality of power supply modules are connected in parallel, and output current is amplified and negative feedback signals are superposed together and then sent into a voltage loop, so that the control current is uniformly distributed among the modules. The scheme is greatly influenced by the parameter precision and the working environment of the device, so that the voltage adjustment rate is poor. In practical application, the output voltage/reference voltage of a plurality of parallel power supplies has deviation, so that a power supply module with high output voltage shares larger current, the device is overloaded, the output of a module with low output voltage is insufficient, and the reliability of a high-power load power supply is reduced.

Disclosure of Invention

The embodiment of the invention provides a multi-path power supply parallel current output device, a multi-path power supply parallel current output method and electronic equipment, which can reduce the deviation of output voltages of a plurality of parallel power supplies, reduce the problem of insufficient overload of devices and improve the reliability of a high-power load power supply.

In a first aspect, an embodiment of the present invention provides a multi-power-supply parallel current output apparatus, where the apparatus includes:

a plurality of parallel connection's a plurality of power module, every power module is connected with voltage output terminal VOUT, and each voltage input end is connected respectively to every power module, and this arbitrary proportion output device of multichannel power parallel current can also include: the device comprises a load and a plurality of detection resistors, wherein two ends of the plurality of detection resistors are respectively connected with two detection ports of a plurality of power modules, one ends of the plurality of detection resistors are also connected with one end of the load, the other ends of the plurality of detection resistors are grounded, and the other end of the load is connected with a voltage output end VOUT; wherein, each power module all includes: the current detection circuit is provided with two detection ports and a result output port, the two detection ports are respectively connected with two ends of the detection circuit, the result output port is connected with the input end of the current source generation circuit, two output ends of the current source generation circuit are respectively connected with two input ends of the comparison circuit, two output ends of the comparison circuit are respectively connected with two input ends of the voltage controller, a third input end of the voltage controller is connected with the voltage input end, and the output end of the voltage controller is connected with the voltage output end VOUT; wherein the content of the first and second substances,

the current detection circuit IS used for obtaining the output current IS of the power supply module by measuring the voltage drop at two ends of the detection resistor and outputting the IS to the current source generation circuit;

the current source generating circuit IS used for converting the received IS current according to a certain proportion and generating a first current source SIA and a second current source SIB of two currents;

the comparison circuit is used for comparing the output voltages of the first current source SIA and the second current source SIB to obtain a first comparison result, comparing the output voltage of the second current source SIB with an equivalent voltage ISET corresponding to the current limiting value of the power module to obtain a second comparison result, and outputting the first comparison result and the second comparison result to the voltage controller;

a voltage controller: the voltage regulator is used for converting the voltage of the power supply input VIN into the required voltage VO and trimming the output voltage VO of the power supply module according to the first comparison result and the second comparison result.

In a second aspect, a method for outputting parallel current of multiple power supplies is provided, and the method is applied to the device provided by the first aspect.

In a third aspect, an electronic device is provided, which includes the apparatus of the first aspect.

The embodiment of the invention has the following beneficial effects:

it can be seen that the output of the parallel current in any proportion can be realized, the structure is simple, the cost is low, the deviation of the output voltage of a plurality of parallel power supplies is reduced, the overload shortage of devices is reduced, and the reliability of the device is further improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of a multi-power-supply parallel current output device;

fig. 2 is a schematic structural diagram of a multi-power-supply parallel current output device provided in the present application.

Detailed Description

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, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

The terms "first," "second," "third," and "fourth," etc. in the description and claims of the invention and in the accompanying drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, result, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Referring to fig. 1, fig. 1 is a schematic diagram of a multi-power-supply parallel open-loop circuit, as shown in fig. 1, a plurality of power modules U1, U2 \8230areconnected together, output voltages VO1, VO2 \8230ofun are identical in structure, each module has a separate current sampling resistor RS1, RS2 \8230, RSn, and current-voltage negative feedback closed-loop control is performed inside the module: current feedback information is acquired through voltage difference at two ends of the sampling resistor and is sent to the voltage control circuit, and when the current is detected to be increased, the voltage is reduced due to negative feedback, so that the current is uniformly distributed.

As shown in fig. 1, the modules of the multi-power-supply parallel open-loop circuit are internally provided with current feedback and voltage closed-loop control, the modules belong to a voltage and current open-loop control system, the output voltage of the system depends on the self-respective adjustment of the current in each module, so that the voltage adjustment rate of the system is poor, and the circuit modules are influenced by a plurality of factors: tolerance, aging, etc. of the device require a large current distribution deviation.

As shown in fig. 2, the circuit diagram of the multiple power sources parallel current output in any proportion provided by the present application, as shown in fig. 2, the multiple power sources parallel current output in any proportion may include: a plurality of parallel connection's a plurality of power module, every power module is connected with voltage output terminal VOUT, and each voltage input end is connected respectively to every power module, and this arbitrary proportion output device of multichannel power parallel current can also include: the two ends of the plurality of detection resistors are respectively connected with the two detection ports of the plurality of power modules, one ends of the plurality of detection resistors are also connected with one end of the load, the other ends of the plurality of detection resistors are grounded, and the other end of the load is connected with the voltage output end VOUT; wherein, each power module all includes: the current detection circuit is provided with two detection ports and a result output port, the two detection ports are respectively connected with two ends of the detection circuit, the result output port is connected with the input end of the current source generation circuit, two output ends of the current source generation circuit are respectively connected with two input ends of the comparison circuit, two output ends of the comparison circuit are respectively connected with two input ends of the voltage controller, a third input end of the voltage controller is connected with the voltage input end, and the output end of the voltage controller is connected with the voltage output end VOUT; wherein the content of the first and second substances,

a voltage controller: the voltage converter is used for converting the voltage of the power input VIN into the required voltage VO and trimming the output voltage VO of the power module according to the first comparison result and the second comparison result.

In particular, the method comprises the following steps of,

the comparison circuit includes: a first comparator CMA, a second comparator CMB, a first ground resistor RA, a second ground resistor RB, a first current source SIA and a second current source SIB; the first current source SIA and the second current source SIB are respectively connected with two output ends of a current source generating circuit, the output end of the first current source SIA is grounded through a first grounding resistor RA, the input end of the first grounding resistor RA is also connected with the non-inverting input end of a first comparator CMA, the inverting input end of the first comparator CMA is connected with the output end of the second current source SIB, the first comparator CMA is one output end of a comparison circuit, the output end of the second current source SIB is grounded through a second grounding resistor RB, the output end of the second current source SIB is also connected with the inverting input end of a second comparator CMB, and the forward input end of the second comparator CMB is connected with an equivalent voltage ISET corresponding to the current limiting value of the power module; the output end of the second comparator CMB is the other output end of the comparison circuit;

optionally, the output voltages of the first current source SIA and the second current source SIB are equal.

Optionally, the first current source SIA and the second current source SIB are completely equal current sources.

Optionally, the resistance values of the first ground resistor RA and the second ground resistor RB are equal.

Each power module in the above circuit has a power input terminal VIN and a power output terminal VO. VO outputs of all parallel power supply modules are connected to a total output VOUT port, and taking the parallel connection of three power supply modules as an example, the parallel connection of the three power supply modules for outputting VO1, VO2 and VO3 can realize that the total output VOUT is larger than the current output by any independent power supply module alone. The total output VOUT is connected to the output load RL and then to ground through the respective current sampling resistor RS of each module. When the plurality of power supply modules are connected in parallel, VB ends of all the power supply modules are connected together.

Each power supply module internally comprises the following parts:

the current detection circuit: and obtaining the output current IS of the power supply module by measuring the voltage drop at two ends of the RS resistor, and outputting the IS to the current source generating circuit.

A current source generation circuit: the current source generating circuit receives IS current and can convert according to a certain proportion and generate two current sources SIA and SIB with completely equal current, the two current sources SIA and SIB are respectively applied to two completely equal grounding resistors RA and RB, VA and VB voltages are respectively generated, and when the system IS in a stable state, VA = VB inside each power supply module.

And a comparator CMA: the non-inverting input end is VA, the inverting input end is VB, and the comparator CMA is used for comparing the voltages of VA and VB and sending a result CMAO output by the comparator to the voltage controller.

A comparator CMB: the reverse input end is VB, the non-inverting input end is equivalent voltage ISET corresponding to the current limiting value of the power supply module, and the comparator CMB is used for comparing voltages of VB and ISET and sending a result CMBO of the comparator to the voltage controller. When VB > ISET, CMBO =0 indicates that overcurrent has occurred in the current power supply module; when VB < ISET, CMBO =1 indicates that no overcurrent has occurred in the current power supply module;

a voltage controller: the submodule converts the supply input VIN voltage to the required CV voltage VSET. Each power supply module connected in parallel outputs the same voltage VSET which is the voltage of each module normally working in a CV mode, and meanwhile, a voltage controller finely adjusts the output voltage of the power supply modules according to the output CMAO and CMBO of the two comparators CMA and CMB;

the proportional relation among the current, the voltage and the resistance of the multi-power-supply parallel current output circuit with any proportion is as follows:

referring to fig. 2, taking the three power modules connected in parallel as an example, there is no specific proportional relationship between the input voltages VIN1, VIN2, and VIN3 of the three power modules, which requires that each power module output can generate a corresponding VSET voltage, and the theoretical CV output voltage of each power module is equal to VSET, i.e., VSET1= VSET2= VSET3= VSET. The current limiting values ISET1, ISET2 and ISET3 of the three power supply modules have no specific proportional relation, and are set to be larger than the rated current capacity of the power supply module according to the current capacity or system requirement of the module. The actual output voltages VO1, VO2, VO3 of the three power modules are equal at any time. The RS current sampling resistance values of all power supply module connections are equal, i.e. RS1= RS2= RS3. The proportional relationship of all modules converting SI to SAI and SIB IS the same, such as SIA = SIB = y IS (y IS a constant). The resistance between the power modules RA1= RB, power module 1, power module 2, and power module 3 inside the same power module is defined as RA1= RB1= R1, RA2= RB2= R2, and RA3= RB3= R3, and R1, R2, and R3 are all constants.

The multi-power-supply parallel output system supports output of currents in any proportion and is realized by changing the proportion of resistance values among R1, R2 and R3 among power supply modules, and the proportion relation of the resistance values of the three power supply modules is R1: R2: R3. When multiple power supply modules are connected in parallel, since the VB terminals of all the power supply modules are connected together, the VB voltage of all the parallel power supply modules is equal at any moment, namely VB1= VB2= VB3.VB = R SIB, and the proportional relationship among SIB1, SIB2, SIB3 is (1/R1): (1/R2): (1/R3). Since SIB = y IS (y IS a constant), the output currents IS1, IS2, and IS3 of the three power modules have a proportional relationship of (1/R1): 1/R2): 1/R3.

The relations are derived under the condition that the system is in a steady state and the current is output in a proportional balance mode, when one or more paths of current fluctuate or the proportion is abnormal due to various factors such as difference among devices, change of working environment, change of load and the like in the actual working process, all voltages and currents fluctuate slightly within the proportional range, and at the moment, each power supply module can regulate the output VO voltage value according to the output of the CMA and CMB modules. Taking the parallel connection of three power modules as an example, the voltage control module of the multi-power parallel arbitrary proportion output circuit of the invention regulates and controls the voltage according to the following procedures:

when any power module, if the power module 2 and the power module 3 fluctuate in voltage of the power module 1, the following actions are performed to realize the current recovery in a predetermined ratio (1/R1): (1/R2): (1/R3) output:

if the voltage of the power module 1 becomes larger, the current IS1 of the power module 1 also becomes larger, and thus VB1 becomes larger accordingly, assuming that IS1 becomes larger by x times (x IS a constant), the corresponding currents IM1, IA1 and IB1 become larger by x times accordingly, resulting in that VA1 and VB1 become larger by x times. However, since VB1 is connected with VB2 of other modules and VB3, and VB2 and VB3 steady-state levels are superposed on VB1, the amplitude of the increase of VB1 is smaller than that of VA1, namely VA1> VB1; and VB2 and VB3 of other modules are superposed with the increased VB1, so VB2 and VB3 are increased accordingly, thereby leading to VB2> VA2 and VB3> VA3.

If VA1> VB1 and VB1< ISET1, namely IS1 current does not exceed the current limiting value of the power module 1, then the power module 1, the power module 2 and the power module 3 keep the originally set CV voltages VO1, VO2 and VO3 unchanged at the moment; if VA1> VB1 and VB1> ISET1 (CMBO 1= 0), i.e., the IS1 current, exceeds the current limit value of the power module 1, thereby triggering over-current protection, the voltage controller of the power module 1 will pull down the set output voltage VO1 until the IS1 current IS less than ISET1, so that VSET1< VSET.

If the voltage of the power module 1 becomes smaller, the current IS1 of the power module 1 IS also smaller and thus VB1 IS also smaller, and if IS1 IS smaller by x times, the corresponding currents IM1, IA1 and IB1 will then become smaller by x times, resulting in VA1 and VB1 being smaller by x times. However, since VB1 is connected with VB2 of other modules and VB3, and VB1 superposes VB2 and VB3 steady-state levels, the reduction amplitude of VB1 is smaller than VA1, that is, VA1< VB1; when the voltage controller 11 detects that VA1< VB1 and the output voltage set by the power module 1 is the CV voltage VSET, the output voltage of the voltage controller 11 remains unchanged; when the voltage controller 11 detects that VA1< VB1 and the output voltage set by the voltage controller 11 is lower than the set CV voltage VSET because the output voltage is adjusted by the overcurrent protection, i.e., VSET1< VSET, the voltage controller of the power module 1 adjusts the output voltage VSET1 to VSET; and VB2 and VB3 of the other modules are overlapped with the reduced VB1, so VB2 and VB3 are reduced accordingly, thereby resulting in VB2< VA2 and VB3< VA3. The power supply modules 2 and 3 do not need to adjust their output voltages.

In combination with the above two, when the voltage of any one or more of the modules connected in parallel fluctuates, if the voltage VA > VB IS detected inside any power supply module and the current power supply module output current IS greater than the current limit value set by the power supply module, that IS, VB > ISET, the current power supply module output voltage IS adjusted downward until IS less than ISET; if the interior of any power supply module detects that VA is less than VB and the output voltage set by the current power supply module is lower than CV voltage VSET, the output voltage of the current module is adjusted and recovered to the set CV voltage VSET; eventually the system returns to steady state.

Each power module of the power parallel output system provided by the invention supports power module overcurrent protection, and the overcurrent protection is realized by comparing VB voltage with equivalent voltage ISET corresponding to the current limiting value of the power module. Taking the power module 1 as an example, when the voltage VB1 of the power module 1 is greater than ISET1, the output of the comparator CMB1 changes and transmits the output CMBO1 to the voltage controller 11, and when the voltage controller 11 detects that CMBO1=0, that is, VB1 is greater than ISET1, it is determined that the current is excessive, and the voltage controller 11 adjusts the output voltage VO1 downward until VB < VA. Thereby ensuring that the power module 1 does not appear an overcurrent condition. All the parallel power modules operate according to the mechanism, so that the overcurrent protection of the whole system is ensured. Meanwhile, the mechanism ensures that the voltage of the module cannot be infinitely adjusted in the adjusting process due to current fluctuation among system modules.

The overcurrent protection and current proportional balance output functions of each power module of the power parallel output system run simultaneously, adjustment can be carried out as long as conditions are met, and the modules do not have sequence or priority.

To better illustrate the above mechanism, the following table lists the conditions under which any one of the power modules n adjusts the output voltage VSETn or remains unchanged:

conditions of	Comparator output	Working state	Voltage regulation action
				VAn>VBn VBn<ISETn VSETn<=VSET	CMAO=1 CMBO=1	The n current of the power supply module is increased without overcurrent	Holding
VAn<VBn VBn<ISETn VSETn<VSET	CMAO=0 CMBO=1	The current of the power module n becomes smaller and the set output voltage VSETn is smaller than the CV voltage VSET	VSETn up-regulation is restored to the set CV voltage VSET
				VAn<VBn VBn<ISETn VSETn=VSET	CMAO=0 CMBO=1	The current of the power module n becomes smaller and the set output voltage VSETn is equal to the CV voltage VSET	Holding
VAn>VBn VBn>ISETn VSETn<=VSET	CMAO=1 CMBO=0	The n current of the power module becomes large and overcurrent occurs	Step-down voltages VSETn through VBn<ISETn
				VAn<VBn VBn>ISETn VSETn<=VSET	CMAO=0 CMBO=0	The n current of the power supply module becomes small and is still in an overcurrent state	Step-down voltages VSETn through VBn<ISETn

The VSET is theoretical CV voltage, and the theoretical CV voltage of all the parallel power supply modules is equal; VSETn is the actual set voltage of power module n, which may be adjusted according to the state, may be equal to VSET, and may also be less than VSET; VOn is the actual output voltage of the power module n, and since the power module outputs VO are connected together, VOn of all parallel power modules is equal, and ideally VOn and VSET are equal and actually not necessarily equal.

It should be noted that for simplicity of description, the above-mentioned method embodiments are described as a series of acts, but those skilled in the art will recognize that the present invention is not limited by the order of acts, as some steps may be performed in other orders or concurrently in accordance with the present invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are exemplary embodiments and that the acts and modules referred to are not necessarily required to practice the invention.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one type of division of logical functions, and there may be other divisions when actually implementing, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed coupling or direct coupling or communication connection between each other may be through some interfaces, indirect coupling or communication connection between devices or units, and may be in an electrical or other form.

Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable memory, which may include: flash Memory disks, read-Only memories (ROMs), random Access Memories (RAMs), magnetic or optical disks, and the like.

The above embodiments of the present invention are described in detail, and the principle and the implementation of the present invention are explained by applying specific embodiments, and the description of the above embodiments is only used to help understanding the method of the present invention and the core idea thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. A multi-power-supply parallel current output device, comprising:

a plurality of parallel connection's a plurality of power module, every power module is connected with voltage output terminal VOUT, and each voltage input end is connected respectively to every power module, and this multichannel power parallel current output device still includes: the two ends of each detection resistor are respectively connected with the two corresponding detection ports of each power module, one end of each detection resistor is also connected with one end of the load, the other ends of the detection resistors are grounded, and the other end of the load is connected with the voltage output end VOUT; wherein, each power module all includes: the current detection circuit is provided with two detection ports and a result output port, the two detection ports are respectively connected with two ends of the detection resistor, the result output port is connected with the input end of the current source generation circuit, two output ends of the current source generation circuit are respectively connected with two input ends of the comparison circuit, two output ends of the comparison circuit are respectively connected with two input ends of the voltage controller, a third input end of the voltage controller is connected with the voltage input end, and the output end of the voltage controller is connected with the voltage output end VOUT; wherein

2. The multi-power-supply parallel current output device according to claim 1, wherein the comparison circuit comprises:

a first comparator CMA, a second comparator CMB, a first grounding resistor RA and a second grounding resistor RB; the first current source SIA and the second current source SIB of the current source generating circuit are respectively connected with two output ends of the current source generating circuit, the output end of the first current source SIA is grounded through a first grounding resistor RA, the input end of the first grounding resistor RA is also connected with the non-inverting input end of a first comparator CMA, the inverting input end of the first comparator CMA is connected with the output end of the second current source SIB, the output end of the first comparator CMA is one output end of a comparison circuit, the output end of the second current source SIB is grounded through a second grounding resistor RB, the output end of the second current source SIB is also connected with the inverting input end of a second comparator CMB, and the forward input end of the second comparator CMB is connected with an equivalent voltage ISET corresponding to the current limiting value of the power module; the output of the second comparator CMB is the other output of the comparison circuit.

3. The multi-power-supply parallel current output device according to claim 2,

the output voltages of the first current source SIA and the second current source SIB are equal.

4. The multi-power-supply parallel current output device according to claim 3,

the first current source SIA and the second current source SIB are completely equal current sources.

5. The multi-power-supply parallel current output device of claim 4,

the first ground resistor RA and the second ground resistor RB have the same resistance.

6. A method for outputting current in parallel of multiple power supplies, wherein the method is applied to the device as claimed in any one of claims 1 to 5.

7. An electronic device, characterized in that the electronic device comprises the apparatus of any of claims 1-5.

8. A computer-readable storage medium, in which a computer program is stored which, when run on a single-chip microcomputer, executes the method as claimed in claim 6.