CN108362937A - A kind of input power circuit for detecting and POL - Google Patents

Abstract

The invention discloses an input power detection circuit and POL, comprising a first detection module for detecting input current, a second detection module and a control module for detecting input voltage, wherein: the input terminal of the first detection module is connected to the The output end of the power supply is connected, the output end of the first detection module is respectively connected with the input end of the second detection module and the input end of the load point conversion circuit, the first input end of the control module is connected with the detection end of the first detection module, and the control The second input terminal of the module is connected to the detection terminal of the second detection module, and the control module is used to obtain input power according to the input current detected by the first detection module and the input voltage detected by the second detection module, so as to realize real-time and accurate detection Measure the input power. Compared with determining the input power of the device through manual measurement in the prior art, the present application can automatically detect the input power in real time, accurately and conveniently, which helps to deal with the overload problem of the device in time and improves the reliability.

Description

An input power detection circuit and POL

technical field

The invention relates to the technical field of electrical appliances, in particular to an input power detection circuit and a POL.

Background technique

The CPU (Central Processing Unit, central processing unit), memory and hardware devices (hard disk, fan, etc.) on the motherboard circuit of servers and other electrical products usually use POL (Point Of Load converter, point of load converter) to convert the voltage to the required voltage. voltage range and current range. The existing POL does not have the function of detecting the input power. Therefore, in the prior art, the input power of the device is determined by manual measurement, and then the power consumption of the device is obtained. However, on the one hand, manual testing is complicated and has low error accuracy; on the other hand, it is impossible to detect the input power in real time, which makes it impossible to deal with it in time when the device is overloaded, which may cause the device to malfunction due to overload.

Therefore, how to provide a solution to the above technical problems is a problem that those skilled in the art need to solve at present.

Contents of the invention

The purpose of the present invention is to provide an input power detection circuit and POL, respectively detect the input current and input voltage through the first detection module and the second detection module, and then obtain the input power through the control module, so that real-time, accurate and convenient automatic detection Measuring the input power helps to deal with the overload problem of the device in time and improves the reliability.

In order to solve the above technical problems, the present invention provides an input power detection circuit, including a first detection module for detecting input current, a second detection module and a control module for detecting input voltage, wherein:

The input end of the first detection module is connected to the output end of the power supply, the output end of the first detection module is respectively connected to the input end of the second detection module and the input end of the load point conversion circuit, and the control module The first input end of the first detection module is connected to the detection end of the first detection module, the second input end of the control module is connected to the detection end of the second detection module, and the control module is used for detecting The input current detected by the module and the input voltage detected by the second detection module are used to obtain input power, so as to realize real-time and accurate detection of input power.

Preferably, the first detection module includes a converting unit and an amplifying unit for converting a current signal into a voltage signal, wherein:

The first terminal of the conversion unit is used as the input terminal of the first detection module, the second terminal of the conversion unit is used as the output terminal of the first detection module, the input terminal of the amplification unit is connected with the conversion unit connected, the output end of the amplifying unit is used as the detection end of the first detection module.

Preferably, the conversion unit is specifically a current detection resistor, the first terminal of the current detection resistor serves as the first terminal of the conversion unit, and the second terminal of the current detection resistor serves as the terminal of the conversion unit. second end.

Preferably, the resistance value of the current detection resistor is milliohm level.

Preferably, the amplifying unit is specifically a differential amplifier, the input terminal of the amplifying unit includes a first input terminal and a second input terminal, and the positive input terminal of the differential amplifier serves as the first input terminal of the amplifying unit, The inverting input terminal of the differential amplifier serves as the second input terminal of the amplifying unit, and the output terminal of the differential amplifier serves as the output terminal of the amplifying unit.

Preferably, the second detection module includes a first voltage dividing unit and a second voltage dividing unit, wherein:

The first terminal of the first voltage dividing unit is used as the input terminal of the second detection module, the second terminal of the first voltage dividing unit is used as the detection terminal of the second detection module, and is connected with the second detection module. The first end of the voltage dividing unit is connected, and the second end of the second voltage dividing unit is grounded.

Preferably, both the first voltage dividing unit and the second voltage dividing unit are resistors with preset resistances.

Preferably, the control module is specifically a monitoring chip.

Preferably, the circuit further includes a controllable switch, the control terminal of the controllable switch is connected to the output terminal of the control module, and the first terminal of the controllable switch is respectively connected to the output terminal of the first detection module and The input end of the second detection module is connected, the second end of the controllable switch is connected to the input end of the point-of-load conversion circuit, and the control module is used to obtain the input power exceeding the preset input During power control, the controllable switch is turned off.

In order to solve the above technical problems, the present invention also provides a POL, including a point-of-load conversion circuit, and also includes the input power detection circuit described in any one of the above, the output terminal of the input power detection circuit is connected to the load The input terminal of the point conversion circuit is connected.

The present invention provides an input power detection circuit, including a first detection module for detecting input current, a second detection module and a control module for detecting input voltage, wherein: the input terminal of the first detection module is connected to the power supply The output terminal is connected, the output terminal of the first detection module is respectively connected with the input terminal of the second detection module and the input terminal of the load point conversion circuit, the first input terminal of the control module is connected with the detection terminal of the first detection module, and the control module The second input terminal is connected to the detection terminal of the second detection module, and the control module is used to obtain input power according to the input current detected by the first detection module and the input voltage detected by the second detection module, so as to realize real-time and accurate detection of input power.

Compared with determining the input power of the device through manual measurement in the prior art, in this application, the input current and the input voltage are respectively detected through the first detection module and the second detection module, and then the input power is obtained through the control module, so that It can automatically detect the input power in real time, accurately and conveniently, which helps to deal with the overload problem of the device in time and improves the reliability.

The present invention also provides a POL, which has the same beneficial effects as the above input power detection circuit.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the prior art and the accompanying drawings that need to be used in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

FIG. 1 is a schematic structural diagram of an input power detection circuit provided by the present invention;

FIG. 2 is a schematic structural diagram of another input power detection circuit provided by the present invention.

Detailed ways

The core of the present invention is to provide an input power detection circuit and POL, respectively detect the input current and input voltage through the first detection module and the second detection module, and then obtain the input power through the control module, so that real-time, accurate and convenient automatic detection Measuring the input power helps to deal with the overload problem of the device in time and improves the reliability.

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to FIG. 1. FIG. 1 is a schematic structural diagram of an input power detection circuit provided by the present invention. The input power detection circuit includes: a first detection module 1 for detecting input current, a first detection module 1 for detecting input voltage Two detection module 2 and control module 3, wherein:

The input end of the first detection module 1 is connected with the output end of the power supply, the output end of the first detection module 1 is respectively connected with the input end of the second detection module 2 and the input end of the load point conversion circuit, the first input of the control module 3 The terminal is connected to the detection terminal of the first detection module 1, the second input terminal of the control module 3 is connected to the detection terminal of the second detection module 2, and the control module 3 is used to detect the input current according to the first detection module 1 and the second The input voltage detected by the detection module 2 is used to obtain the input power, so as to realize real-time and accurate detection of the input power.

It should be noted that the presets and presets in this application are set in advance and only need to be set once, unless they are modified according to the actual situation, they do not need to be set again. The point-of-load conversion circuit in this application is a POL circuit used to convert voltage into the voltage range and current range required by each device on the main board circuit in the prior art. The output terminal of the input power detection circuit in this application is connected to The input terminal connection of the point-of-load conversion circuit.

Specifically, the input power detection circuit in this application includes a first detection module 1 , a second detection module 2 and a control module 3 . In this application, the input current of the point-of-load conversion circuit is detected by the first detection module 1, the input voltage of the point-of-load conversion circuit is detected by the second detection module 2, and the first detection module 1 and the second detection module 2 respectively detect the input current The current and input voltage are sent to the control module 3 . It can be seen that the first detection module 1 and the second detection module 2 can automatically and accurately detect and send the input current and input voltage of the point-of-load conversion circuit respectively in real time.

The control module 3 detects the input power according to the received input current and input voltage, so that the power consumption of each hardware device can be accurately determined through the detected input power. Obviously, in this application, the input power of the point-of-load conversion circuit can be detected automatically through the first detection module 1, the second detection module 2 and the control module 3, without manual operation by the staff, which is flexible, fast and convenient, and reduces power detection. Measure the difficulty and complexity, and improve the user experience.

In addition, considering that the input current and input voltage detected by the first detection module 1 and the second detection module 2 in this application are more accurate than the current and voltage data obtained by manual measurement in the prior art, based on this, in this application The input power detected by the control module 3 according to the above-mentioned input current and input voltage is more accurate, and the error is smaller, which improves the power measurement accuracy.

Further, the first detection module 1 and the second detection module 2 detect and send the input current and input voltage in real time, therefore, the control module 3 can detect the input power in real time to achieve the function of real-time monitoring, which is helpful for timely detection and processing The overload problem of the device on the server motherboard circuit reduces the possibility of device failure due to overload, improves the reliability of the server, and thus enhances the competitiveness of the product.

With the wide application of servers and more electrical products, the single-phase design is becoming more and more popular in the current circuit design, and more and more POL IC (Integrated Circuit, integrated circuit) designs are also increasing. Therefore, introducing the input power detection design into the POL design in this application can improve the functionality and convenience of the POL design.

The present invention provides an input power detection circuit, including a first detection module for detecting input current, a second detection module and a control module for detecting input voltage, wherein: the input terminal of the first detection module is connected to the power supply The output terminal is connected, the output terminal of the first detection module is respectively connected with the input terminal of the second detection module and the input terminal of the load point conversion circuit, the first input terminal of the control module is connected with the detection terminal of the first detection module, and the control module The second input terminal is connected to the detection terminal of the second detection module, and the control module is used to obtain input power according to the input current detected by the first detection module and the input voltage detected by the second detection module, so as to realize real-time and accurate detection of input power.

Compared with determining the input power of the device through manual measurement in the prior art, in this application, the input current and the input voltage are respectively detected through the first detection module and the second detection module, and then the input power is obtained through the control module, so that It can automatically detect the input power in real time, accurately and conveniently, which helps to deal with the overload problem of the device in time and improves the reliability.

On the basis of above-mentioned embodiment:

As a preferred embodiment, the first detection module 1 includes a converting unit and an amplifying unit for converting a current signal into a voltage signal, wherein:

The first terminal of the conversion unit is used as the input terminal of the first detection module 1, the second terminal of the conversion unit is used as the output terminal of the first detection module 1, the input terminal of the amplification unit is connected with the conversion unit, and the output terminal of the amplification unit is used as the first detection module 1. Detection terminal of detection module 1.

Specifically, the first detection module 1 for detecting input current in this application includes a conversion unit and an amplification unit, the conversion unit is used to convert the current signal into a voltage signal, and then amplifies and outputs the voltage at both ends of the conversion unit through the amplification unit , so as to obtain the detection signal of the input current. In addition, for the safety of the circuit, the input current needs to meet the acceptable voltage range of the control module 3 .

As a preferred embodiment, the conversion unit is specifically a current detection resistor, the first terminal of the current detection resistor is used as the first terminal of the conversion unit, and the second terminal of the current detection resistor is used as the second terminal of the conversion unit.

Specifically, the conversion unit may specifically be a current detection resistor (Rshunt). When the current is constant, the smaller the current detection resistance is, the smaller the voltage at both ends will be, and the measurement error will be greater; the larger the current detection resistance, the greater the voltage at both ends, and the measurement accuracy will be improved. Based on this, this application is based on the actual It is necessary to select a current sense resistor with an appropriate resistance value.

As a preferred embodiment, the resistance value of the current detection resistor is at the milliohm level.

Specifically, considering the acceptable voltage range of the control module 3 and the maximum power that the current detection resistor can withstand, in this application, the resistance value of the current detection resistor is designed to milliΩ level, thereby avoiding the current The detection resistor exceeds the rated power, and also avoids exceeding the acceptable voltage range of the control module 3 .

As a preferred embodiment, the amplifying unit is specifically a differential amplifier, the input end of the amplifying unit includes a first input end and a second input end, the positive input end of the differential amplifier serves as the first input end of the amplifying unit, and the input end of the differential amplifier The reverse input terminal is used as the second input terminal of the amplifying unit, and the output terminal of the differential amplifier is used as the output terminal of the amplifying unit.

Specifically, the amplifying unit in the present application may be a differential amplifier, which differentially amplifies and outputs the difference between the voltages at both ends of the conversion unit. The differential amplifier is a direct-coupled amplifier with very small zero point drift, so the DC amplification effect is better, and the error of the detected current obtained is small.

As a preferred embodiment, the second detection module 2 includes a first voltage dividing unit and a second voltage dividing unit, wherein:

The first end of the first voltage dividing unit is used as the input end of the second detection module 2, and the second end of the first voltage dividing unit is used as the detection end of the second detection module 2, and is connected with the first end of the second voltage dividing unit , the second terminal of the second voltage dividing unit is grounded.

Specifically, the second detection module 2 used to detect the input voltage in this application includes a first voltage division unit and a second voltage division unit, and a detection of an input voltage is generated through the first voltage division unit and the second voltage division unit. signal. In consideration of circuit safety and design difficulty, the second terminal of the second voltage dividing unit is grounded in this application.

As a preferred embodiment, both the first voltage dividing unit and the second voltage dividing unit are resistors with preset resistances.

Specifically, both the first voltage dividing unit and the second voltage dividing unit in the present application may be resistors with preset resistance values, which is less difficult to design and lower in cost. When the required resistance value is relatively large, the preset resistance value here can also be a resistance module in which multiple resistances are connected in series. The present invention makes no special limitation here, and it is determined according to the actual situation.

As a preferred embodiment, the control module 3 is specifically a monitoring chip.

Specifically, the control module 3 in this application may be a monitoring chip, and the monitoring chip has a high degree of integration and can complete the functions of the control module 3 . It should be noted that the detection signal of the input current obtained by the first detection module 1 and the detection signal of the input voltage obtained by the second detection module 2 must meet the acceptable voltage range of the monitoring chip.

As a preferred embodiment, the circuit also includes a controllable switch 4, the control end of the controllable switch 4 is connected to the output end of the control module 3, and the first end of the controllable switch 4 is respectively connected to the output of the first detection module 1 terminal is connected to the input terminal of the second detection module 2, the second terminal of the controllable switch 4 is connected to the input terminal of the point-of-load conversion circuit, and the control module 3 is used to control the controllable switch 4 when the input power obtained exceeds the preset input power. Switch 4 is off.

Specifically, in order to avoid problems with the machine when the system is overloaded, the input power detection circuit in this application also includes a controllable switch 4. When the detected input power exceeds the preset input power, the control module 3 will control the controllable The switch 4 is turned off, thereby cutting off the point-of-load conversion circuit in time, reducing the possibility of safety incidents. Certainly, the control module 3 may control the controllable switch 4 to be turned off when the detected input power exceeds the preset input power and reaches a preset time threshold, depending on the actual situation.

The present invention also provides a POL, which includes a point-of-load conversion circuit and any one of the above-mentioned input power detection circuits, the output end of the input power detection circuit is connected to the input end of the point-of-load conversion circuit.

For the introduction of the POL provided in this application, please refer to the above-mentioned embodiment of the input power detection circuit, and this application will not repeat it here.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

It should also be noted that in this specification, relative terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or operations There is no such actual relationship or order between the operations. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. An input power detection circuit, characterized in that it comprises a first detection module for detecting input current, a second detection module and a control module for detecting input voltage, wherein: The input end of the first detection module is connected to the output end of the power supply, the output end of the first detection module is respectively connected to the input end of the second detection module and the input end of the load point conversion circuit, and the control module The first input end of the first detection module is connected to the detection end of the first detection module, the second input end of the control module is connected to the detection end of the second detection module, and the control module is used for detecting The input current detected by the module and the input voltage detected by the second detection module are used to obtain input power, so as to realize real-time and accurate detection of input power. 2. The input power detection circuit according to claim 1, wherein the first detection module comprises a converting unit and an amplifying unit for converting a current signal into a voltage signal, wherein: The first terminal of the conversion unit is used as the input terminal of the first detection module, the second terminal of the conversion unit is used as the output terminal of the first detection module, the input terminal of the amplification unit is connected with the conversion unit connected, the output end of the amplifying unit is used as the detection end of the first detection module. 3. The input power detection circuit according to claim 2, wherein the conversion unit is specifically a current detection resistor, the first end of the current detection resistor is used as the first end of the conversion unit, The second terminal of the current detection resistor is used as the second terminal of the converting unit. 4. The input power detection circuit as claimed in claim 3, wherein the resistance value of the current detection resistor is milliohm level. 5. The input power detection circuit according to claim 2, wherein the amplifying unit is specifically a differential amplifier, the input of the amplifying unit includes a first input terminal and a second input terminal, and the differential amplifier The positive input terminal of the differential amplifier is used as the first input terminal of the amplifying unit, the inverting input terminal of the differential amplifier is used as the second input terminal of the amplifying unit, and the output terminal of the differential amplifier is used as the output of the amplifying unit end. 6. The input power detection circuit according to claim 1, wherein the second detection module comprises a first voltage dividing unit and a second voltage dividing unit, wherein: The first terminal of the first voltage dividing unit is used as the input terminal of the second detection module, the second terminal of the first voltage dividing unit is used as the detection terminal of the second detection module, and is connected with the second detection module. The first end of the voltage dividing unit is connected, and the second end of the second voltage dividing unit is grounded. 7. The input power detection circuit according to claim 6, wherein the first voltage dividing unit and the second voltage dividing unit are resistors with preset resistances. 8. The input power detection circuit according to claim 1, wherein the control module is specifically a monitoring chip. 9. The input power detection circuit according to any one of claims 1-8, characterized in that the circuit further comprises a controllable switch, the control terminal of the controllable switch is connected to the output terminal of the control module, The first terminal of the controllable switch is respectively connected to the output terminal of the first detection module and the input terminal of the second detection module, and the second terminal of the controllable switch is connected to the input terminal of the point-of-load conversion circuit. The terminals are connected, and the control module is used to control the controllable switch to turn off when the obtained input power exceeds a preset input power. 10. A POL, comprising a point-of-load conversion circuit, characterized in that it also includes the input power detection circuit according to any one of claims 1-9, the output terminal of the input power detection circuit is connected to the point-of-load The input terminal of the conversion circuit is connected.