阅读说明：本技术 一种均流控制系统、方法、多电源供电系统及集成电路 (Current-sharing control system and method, multi-power-supply power supply system and integrated circuit ) 是由 李卓鸣 于 2021-06-29 设计创作，主要内容包括：本申请公开了一种均流控制系统、方法、多电源供电系统与集成电路,该均流控制系统包括多个均流模块,每个均流模块包括第一MOS管、第二MOS管、输出电感、动作MOS管、电压采样电路和控制器；电压采样电路用于对动作MOS管的第一端和第二端之间的电压进行电压采样并发送到控制器；控制器用于判断电压是否超出正常工作条件,以确定是否断开动作MOS管。本申请通过动作MOS管实现常规的电压采样,并在控制器判断该动作MOS管的电压超出正常工作条件时断开,从而隔离非正常工作的供电电源与其他电路,保证其他正常工作的供电电源和负载电路不会受到影响,为多电源供电提供了有力的技术支持。(The application discloses a current-sharing control system, a current-sharing control method, a multi-power supply system and an integrated circuit, wherein the current-sharing control system comprises a plurality of current-sharing modules, and each current-sharing module comprises a first MOS (metal oxide semiconductor) tube, a second MOS tube, an output inductor, an action MOS tube, a voltage sampling circuit and a controller; the voltage sampling circuit is used for sampling the voltage between the first end and the second end of the action MOS tube and sending the voltage to the controller; the controller is used for judging whether the voltage exceeds a normal working condition so as to determine whether to disconnect the MOS tube. According to the power supply circuit, conventional voltage sampling is achieved through the action MOS tube, and the action MOS tube is disconnected when the controller judges that the voltage of the action MOS tube exceeds a normal working condition, so that a power supply source and other circuits which do not work normally are isolated, the power supply source and the load circuit which work normally cannot be influenced, and powerful technical support is provided for multi-power supply.)

1. The utility model provides a current-sharing control system, its characterized in that includes a plurality of current-sharing modules, every current-sharing module includes first MOS pipe, second MOS pipe, output inductance, action MOS pipe, voltage sampling circuit and controller, wherein:

the control end of the action MOS tube, the control end of the first MOS tube and the control end of the second MOS tube are all connected with the controller;

the first end of the first MOS tube is connected with a corresponding power supply, the second end of the first MOS tube is connected with the first end of the second MOS tube and the first end of the output inductor, the second end of the second MOS tube is grounded, the second end of the output inductor is connected with the first end of the action MOS tube, and the second end of the action MOS tube is used as the voltage output end of the current equalizing module;

the voltage sampling circuit is used for sampling the voltage between the first end and the second end of the action MOS tube and sending the voltage to the controller;

the controller is used for judging whether the voltage exceeds a normal working condition or not so as to determine whether the action MOS tube is disconnected or not.

2. The current share control system of claim 1, wherein the controller is further configured to:

and determining the current of the action MOS tube according to the voltage and the on-resistance of the action MOS tube.

3. The current sharing control system according to claim 2, wherein the determining whether the voltage exceeds a normal operating condition to determine whether to turn off the active MOS transistor comprises:

judging whether the voltage and the current exceed normal working conditions;

if yes, the action MOS tube is disconnected.

4. The current share control system of claim 3, wherein the normal operating conditions include:

the voltage is within a preset voltage range and the current is within a preset current range;

the preset current range is specifically a current range determined according to the minimum percentage and the maximum percentage of the average value of the currents of all the current equalizing modules.

5. The current sharing control system according to any of claims 2 to 4, wherein the controller is further configured to:

obtaining the currents of other current equalizing modules and calculating an average value;

and adjusting the control signal of the first MOS transistor and/or the second MOS transistor according to the average value.

6. The current sharing control system according to claim 5, wherein the process of adjusting the control signal of the first MOS transistor and/or the second MOS transistor according to the average value includes:

and adjusting the control signal of the first MOS tube and/or the second MOS tube according to the magnitude relation between the average value and the current of the local current equalizing module.

7. The current sharing control system according to claim 6, wherein the process of adjusting the control signal of the first MOS transistor and/or the second MOS transistor according to the magnitude relation between the average value and the current of the local current sharing module includes:

and adjusting the pulse width of the control signal of the first MOS tube and/or the second MOS tube according to the magnitude relation between the average value and the current of the local current equalizing module.

8. A current sharing control method is applied to a controller of a current sharing control system according to any one of claims 1 to 7, and the control method comprises the following steps:

acquiring voltage obtained by a voltage sampling circuit by sampling voltage between a first end and a second end of an action MOS tube;

and judging whether the voltage exceeds a normal working condition or not so as to determine whether the action MOS tube is disconnected or not.

9. A multi-power supply system, comprising a plurality of power supplies, and the current sharing control system as claimed in any one of claims 1 to 7.

10. An integrated circuit comprising the current share control system of any of claims 1 to 7.

Technical Field

The invention relates to the field of system power management, in particular to a current-sharing control system, a current-sharing control method, a multi-power supply system and an integrated circuit.

Background

With the continuous development of server components, the voltage amplitude of a power supply required by each component is smaller and smaller, and the current is larger and larger. Meanwhile, the requirements of complex devices such as servers on continuous power supply, reliability, safety and power consumption of a power supply system are higher and higher. And the safety and reliability cannot be guaranteed by the power supply of a single power supply, so that a parallel redundancy scheme of the power supply is generated.

In the parallel redundancy scheme, a plurality of power supply sources are connected in parallel, and output current to the same load, so that the condition of overload or uneven current is avoided, the parallel power supply sources are controlled by current sharing to ensure the uniform output of load power, and the reliability of power supply is ensured.

Common current sharing control methods include a passive current sharing method and an active current sharing method, wherein the passive current sharing method realizes current negative feedback adjustment through a series resistor, the method cannot be applied to loads requiring small voltage fluctuation, and the power consumption of the series resistor affects the power supply efficiency; the active current sharing comprises a master-slave current sharing method and an automatic current sharing method, the master-slave current sharing method is limited by the master module, if the master module fails, the whole parallel power supply system fails, and the reliability is not enough; the reliability of the automatic current sharing method depends on an additionally added switch, a fault recognition circuit, a judgment circuit and a switch switching circuit, the design is complex, and the cost is high.

Therefore, how to provide a solution to the above technical problems is a problem to be solved by those skilled in the art.

Disclosure of Invention

In view of the above, the present invention provides a current sharing control system, method, multi-power supply system and integrated circuit with good current sharing effect, simple circuit structure and high reliability. The specific scheme is as follows:

the utility model provides a current-sharing control system, includes a plurality of modules of flow equalizing, every the module of flow equalizing includes first MOS pipe, second MOS pipe, output inductance, action MOS pipe, voltage sampling circuit and controller, wherein:

the control end of the action MOS tube, the control end of the first MOS tube and the control end of the second MOS tube are all connected with the controller;

the first end of the first MOS tube is connected with a corresponding power supply, the second end of the first MOS tube is connected with the first end of the second MOS tube and the first end of the output inductor, the second end of the second MOS tube is grounded, the second end of the output inductor is connected with the first end of the action MOS tube, and the second end of the action MOS tube is used as the voltage output end of the current equalizing module;

the voltage sampling circuit is used for sampling the voltage between the first end and the second end of the action MOS tube and sending the voltage to the controller;

the controller is used for judging whether the voltage exceeds a normal working condition or not so as to determine whether the action MOS tube is disconnected or not.

Preferably, the controller is further configured to:

and determining the current of the action MOS tube according to the voltage and the on-resistance of the action MOS tube.

Preferably, the step of judging whether the voltage exceeds a normal operating condition to determine whether to turn off the active MOS transistor includes:

judging whether the voltage and the current exceed normal working conditions;

if yes, the action MOS tube is disconnected.

Preferably, the normal operating conditions include:

the voltage is within a preset voltage range and the current is within a preset current range;

the preset current range is specifically a current range determined according to the minimum percentage and the maximum percentage of the average value of the currents of all the current equalizing modules.

Preferably, the controller is further configured to:

obtaining the currents of other current equalizing modules and calculating an average value;

and adjusting the control signal of the first MOS transistor and/or the second MOS transistor according to the average value.

Preferably, the process of adjusting the control signal of the first MOS transistor and/or the second MOS transistor according to the average value includes:

and adjusting the control signal of the first MOS tube and/or the second MOS tube according to the magnitude relation between the average value and the current of the local current equalizing module.

Preferably, the adjusting the control signal of the first MOS transistor and/or the second MOS transistor according to the magnitude relationship between the average value and the current of the local current sharing module includes:

and adjusting the pulse width of the control signal of the first MOS tube and/or the second MOS tube according to the magnitude relation between the average value and the current of the local current equalizing module.

Correspondingly, the present application also discloses a current sharing control method, which is applied to the controller of the current sharing control system according to any one of the above descriptions, and the control method includes:

acquiring voltage obtained by a voltage sampling circuit by sampling voltage between a first end and a second end of an action MOS tube;

and judging whether the voltage exceeds a normal working condition or not so as to determine whether the action MOS tube is disconnected or not.

Correspondingly, the application also discloses a multi-power supply system which comprises a plurality of power supply sources, and the current-sharing control system is used for controlling the current sharing of any one of the power supply sources.

Correspondingly, the application also discloses an integrated circuit comprising the current sharing control system.

The application discloses a current-sharing control system, which comprises a plurality of current-sharing modules, wherein each current-sharing module comprises a first MOS (metal oxide semiconductor) tube, a second MOS tube, an output inductor, an action MOS tube, a voltage sampling circuit and a controller; the voltage sampling circuit is used for sampling the voltage between the first end and the second end of the action MOS tube and sending the voltage to the controller; the controller is used for judging whether the voltage exceeds a normal working condition or not so as to determine whether the action MOS tube is disconnected or not. According to the power supply circuit, conventional voltage sampling is achieved through the action MOS tube, and the action MOS tube is disconnected when the controller judges that the voltage of the action MOS tube exceeds a normal working condition, so that a power supply source and other circuits which do not work normally are isolated, the power supply source and the load circuit which work normally cannot be influenced, and powerful technical support is provided for multi-power supply.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a block diagram of a current sharing control system according to an embodiment of the present invention;

fig. 2 is a flowchart illustrating a current sharing control method according to an embodiment of the present invention.

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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Common current sharing control methods include a passive current sharing method and an active current sharing method, wherein the passive current sharing method realizes current negative feedback adjustment through a series resistor, the method cannot be applied to loads requiring small voltage fluctuation, and the power consumption of the series resistor affects the power supply efficiency; the active current sharing comprises a master-slave current sharing method and an automatic current sharing method, the master-slave current sharing method is limited by the master module, if the master module fails, the whole parallel power supply system fails, and the reliability is not enough; the reliability of the automatic current sharing method depends on an additionally added switch, a fault recognition circuit, a judgment circuit and a switch switching circuit, the design is complex, and the cost is high.

According to the power supply circuit, conventional voltage sampling is achieved through the action MOS tube, and the action MOS tube is disconnected when the controller judges that the voltage of the action MOS tube exceeds a normal working condition, so that a power supply source and other circuits which do not work normally are isolated, the power supply source and the load circuit which work normally cannot be influenced, and powerful technical support is provided for multi-power supply.

The embodiment of the invention discloses a current-sharing control system, which is shown in fig. 1 and comprises a plurality of current-sharing modules 1, wherein each current-sharing module 1 comprises a first MOS (metal oxide semiconductor) transistor M1, a second MOS transistor M2, an output inductor L, an action MOS transistor M-V, a voltage sampling circuit 11 and a controller 12, wherein:

the control end of the action MOS tube M-V, the control end of the first MOS tube M1 and the control end of the second MOS tube M2 are all connected with the controller 12;

the first end of the first MOS tube M1 is connected with a corresponding power supply V-in, the first end of the first MOS tube M1 is connected with the first end of the second MOS tube M2 and the first end of the output inductor L, the second end of the second MOS tube M2 is grounded, the second end of the output inductor L is connected with the first end of the action MOS tube M-V, and the second end of the action MOS tube M-V is used as the voltage output end V-out of the current-sharing module 1;

the voltage sampling circuit 11 is used for sampling the voltage between the first end and the second end of the action MOS tube M-V and sending the voltage to the controller 12;

the controller 12 is used to determine whether the voltage exceeds a normal operating condition to determine whether to turn off the active MOS transistor M-V.

It can be understood that, in this embodiment, because the on-resistance RDSon existing when the action MOS transistor M-V is turned on can replace the original series resistor, the voltage of the action MOS transistor M-V can be collected and the working state of the whole current equalizing module 1 can be determined according to the collected voltage.

Specifically, the controller 12 is further configured to:

and determining the current of the action MOS tube M-V according to the voltage and the conduction impedance RDson of the action MOS tube M-V.

Further, the process of the controller 12 determining whether the voltage exceeds the normal operating condition to determine whether to turn off the MOS transistor M-V includes:

judging whether the voltage and the current exceed normal working conditions or not;

if yes, the MOS transistor M-V is turned off.

Wherein the normal operating conditions include:

the voltage is within a preset voltage range and the current is within a preset current range;

the preset current range is specifically a current range determined according to the minimum percentage and the maximum percentage of the average value of the currents of all the current sharing modules 1.

Specifically, the working states beyond the normal working condition include an overvoltage state and an undervoltage state, for example, a preset voltage range of [ 80%. v ] is assumed₀，120％*v₀]The preset current range of the current is [ 50%. I%₀，130％*I₀]At this time, the overvoltage condition is the maximum value of the voltage and the current which both exceed their corresponding ranges upwards, and the undervoltage condition is the minimum value of the voltage and the current which both exceed their ranges downwards.

It can be understood that once the normal working condition is exceeded, the MOS transistor M-V is turned off, that is, the output of the current equalizing module 1 is turned off, so as to prevent the output inductor L from continuously supplying power to the rear-end load connected to the voltage output terminal V-out, so as to realize the rapid power-down of the voltage output terminal V-out, and simultaneously isolate the current equalizing module 1, so as to prevent the normal work of other current equalizing modules 1 and the rear-end load from being affected.

In some specific embodiments, the controller 12 is further configured to:

obtaining the currents of other current equalizing modules 1 and calculating the average value;

and adjusting the control signal of the first MOS transistor M1 and/or the second MOS transistor M2 according to the average value.

Further, the controller 12 performs a process of adjusting the control signal of the first MOS transistor M1 and/or the second MOS transistor M2 according to the average value, including:

and adjusting the control signal of the first MOS transistor M1 and/or the second MOS transistor M2 according to the relation between the average value and the current of the local current equalizing module 1.

Specifically, the pulse width of the control signal of the first MOS transistor M1 and/or the second MOS transistor M2 is adjusted according to the magnitude relation between the average value and the current of the local current sharing module 1.

It can be understood that the controller 12 controls the first MOS transistor M1, the second MOS transistor M2, and the action MOS transistor M-V through pulse signals, and the pulse signals are generated by the PWM generator. The controller 12 continuously compares the average value with the sampled current through the comparator, and if the sampled current is greater than the comparison value, the pulse width of the control signal of the first MOS transistor M1 and/or the second MOS transistor M2 is reduced, so that the output current is reduced; if the sampled current is smaller than the comparison value, the pulse width of the control signal of the first MOS transistor M1 and/or the second MOS transistor M2 is increased, so that the output current is increased. And finally, realizing the dynamic current sharing of all the current sharing modules 1.

Correspondingly, an embodiment of the present application further discloses a current sharing control method, which is applied to a controller of the current sharing control system described in any one of the above paragraphs, and referring to fig. 2, the control method includes:

s1: acquiring voltage obtained by a voltage sampling circuit by sampling voltage between a first end and a second end of an action MOS tube;

s2: and judging whether the voltage exceeds a normal working condition or not to determine whether the MOS tube is disconnected or not.

According to the power supply circuit, conventional voltage sampling is achieved through the action MOS tube, and the action MOS tube is disconnected when the controller judges that the voltage of the action MOS tube exceeds a normal working condition, so that a power supply source and other circuits which do not work normally are isolated, the power supply source and the load circuit which work normally cannot be influenced, and powerful technical support is provided for multi-power supply.

In some specific embodiments, the control method further includes:

and determining the current of the action MOS tube according to the voltage and the on-resistance of the action MOS tube.

In some specific embodiments, the determining whether the voltage exceeds a normal operating condition to determine whether to turn off the action MOS transistor specifically includes:

judging whether the voltage and the current exceed normal working conditions;

if yes, the action MOS tube is disconnected.

In some specific embodiments, the normal operating conditions include:

the voltage is within a preset voltage range and the current is within a preset current range;

the preset current range is specifically a current range determined according to the minimum percentage and the maximum percentage of the average value of the currents of all the current equalizing modules.

In some specific embodiments, the control method further includes:

obtaining the currents of other current equalizing modules and calculating an average value;

and adjusting the control signal of the first MOS transistor and/or the second MOS transistor according to the average value.

In some specific embodiments, the adjusting the control signal of the first MOS transistor and/or the second MOS transistor according to the average value specifically includes:

and adjusting the control signal of the first MOS tube and/or the second MOS tube according to the magnitude relation between the average value and the current of the local current equalizing module.

In some specific embodiments, the adjusting the control signal of the first MOS transistor and/or the second MOS transistor according to the magnitude relationship between the average value and the current of the local current sharing module specifically includes:

and adjusting the pulse width of the control signal of the first MOS tube and/or the second MOS tube according to the magnitude relation between the average value and the current of the local current equalizing module.

Correspondingly, the embodiment of the application also discloses a multi-power-supply power supply system which comprises a plurality of power supply sources, and the current-sharing control system is provided with any one of the above embodiments.

Correspondingly, the embodiment of the application also discloses an integrated circuit, which comprises the current sharing control system in any one of the above embodiments.

It can be understood that specific details of the current sharing control system in this embodiment may refer to related contents in the foregoing embodiments, and are not described herein again.

The multi-power-supply system and the integrated circuit in this embodiment have the same technical effects as the current sharing control system in the above embodiments, and are not described herein again.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The present invention provides a current sharing control system, method, multi-power supply system and integrated circuit, which are introduced in detail above, and the present invention applies specific examples to illustrate the principle and implementation manner of the present invention, and the description of the above embodiments is only used to help understanding the method and the core idea of the present invention; 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.