WO2016082395A1

WO2016082395A1 - Power control method and apparatus

Info

Publication number: WO2016082395A1
Application number: PCT/CN2015/075153
Authority: WO
Inventors: 王吉信; 梁新春
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-11-24
Filing date: 2015-03-26
Publication date: 2016-06-02
Also published as: CN105610302B; CN105610302A

Abstract

Provided are a power control method and apparatus. The apparatus comprises: a current loop module(32), configured to sample an output current of a power source, output a sampled current obtained by sampling to a processing module (36), receive a reference current signal from the processing module and adjust the output current of the power source according to the reference current signal; and/or a voltage loop module (34), configured to sample an output voltage of the power source, output a sampled voltage obtained by sampling to the processing module, receive a reference voltage signal from the processing module and adjust the output voltage of the power source according to the reference voltage signal; and the processing module, configured to obtain current output power according to the sampled voltage and/or the sampled current, and generate the reference current signal and/or the reference voltage signal according to a comparison result between the current output power and a pre-set constant power threshold. The power control method and apparatus realize the effective control over constant power.

Description

Power control method and device

Technical field

The present invention relates to the field of communications, and in particular to a power control method and apparatus.

Background technique

Switching power supply load adaptability requirements, load current becomes larger, after entering the constant current mode, the output voltage will decrease, then the actual output power of the power supply will become smaller, so that the load is a constant power demand, it can not meet the application; It can provide more current when the voltage is lower than the lower limit, and achieve constant power control.

The control methods commonly used in the related art: 1. Multiplier scheme (as shown in FIG. 1), respectively sampling the output voltage and current, sending a constant power loop, and controlling the pulse width modulation technique (Pulse Width Modulation, referred to as PWM). Air ratio, adjust the output; can be realized by pure hardware, but the multiplier is higher in price and higher in cost; 2. Software control, power supply control protection is realized in the development of single-chip microcomputer, digital signal processor (DSP) The single-chip microcomputer can realize various control and protection, realize the function of the multiplier by using the single-chip microcomputer, calculate the relationship between the output voltage and the current, and realize the constant power control; if the PWM output is completely controlled by the single-chip computer, the speed of the system response will be slow, and the use DSP will bring more cost increases.

In the related art, the problem of controlling constant power cannot be effectively realized, and an effective solution has not been proposed.

Summary of the invention

The embodiment of the invention provides a power control method and device to solve at least the problem that the constant power can not be effectively controlled in the related art.

According to an embodiment of the present invention, a power control apparatus is provided, including: a current loop module, a voltage loop module, and a processing module, the current loop module configured to sample an output current of a power supply, and Sampling the sampled current output to the processing module; and receiving a reference current signal from the processing module, and adjusting an output current of the power supply according to the reference current signal; and/or the voltage loop module, setting And sampling the output voltage of the power supply, and outputting the sampled sampling voltage to the processing module; receiving a reference voltage signal from the processing module, and adjusting an output of the power supply according to the reference voltage signal The processing module is configured to obtain a current output power according to the sampling voltage and/or the sampling current, and generate the reference according to a comparison result between the current output power and a preset constant power threshold. a current signal and/or the reference voltage signal, wherein the predetermined constant power threshold is a power value at which the power source maintains a constant power within a preset power range, the reference current signal and/or the reference voltage signal The power set to adjust the power source is maintained within the preset power range.

The current loop module includes: a current sampling circuit connected to the processing module, configured to sample an output current of the power source; and a compensation circuit connected to the current sampling circuit and configured to sample the sampled current Make compensation.

The current loop module further includes an operational amplifier circuit coupled to the current sampling circuit and the processing module, configured to perform amplification processing on the sampling current.

The voltage loop module includes: a voltage sampling circuit connected to the processing module, configured to sample an output voltage of the power supply; and a compensation circuit connected to the voltage sampling circuit and configured to sample the sampled voltage Make compensation.

The voltage loop module further includes an operational amplifier circuit coupled to the voltage sampling circuit and the processing module, configured to perform amplification processing on the sampling voltage.

The processing module is a single chip microcomputer.

According to another embodiment of the present invention, there is also provided a power control method, comprising: a processing module acquiring a sampling voltage of a power supply output voltage and/or a sampling current of an output current; the processing module according to the sampling voltage and/or The sampling current obtains a current output power; the processing module generates a reference current signal and/or a reference voltage signal according to a comparison result between the current output power and a preset constant power threshold, wherein the preset constant power threshold is The power source maintains a constant power value within a preset power range, and the reference current signal and/or the reference voltage signal is used to adjust the power of the power source to remain within the preset power range; The reference current signal is sent to the current loop module and/or the reference voltage signal is sent to the voltage loop module.

The processing module acquiring the sampling current of the power output current includes: the processing module receiving the current after sampling the output current by the current sampling circuit and compensating the sampling current by the compensation circuit.

Before the current sampling circuit samples the output current of the power source, the method further includes: amplifying the sampling current by an operational amplifier circuit.

The processing module is a single chip microcomputer.

Through the embodiment of the present invention, a current loop module is adopted, which is configured to sample the output current of the power supply, output the sampled sampling current to the processing module, and receive the reference current signal from the processing module, and adjust according to the reference current signal. An output current of the power supply; and/or a voltage loop module configured to sample the output voltage of the power supply, output the sampled voltage to the processing module, and receive a reference voltage signal from the processing module, and based on the reference voltage signal Adjusting the output voltage of the power supply; the processing module is configured to obtain the current output power according to the sampling voltage and/or the sampling current, and generate a reference current signal and/or a reference voltage signal according to a comparison result between the current output power and a preset constant power threshold, The preset constant power threshold is a power value at which the power source maintains a constant power within a preset power range, and the reference current signal and/or the reference voltage signal is used to adjust the power of the power source to be maintained within a preset power range. The invention solves the problem that the constant power can not be effectively controlled in the related art, thereby realizing effective control of constant power.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

1 is a block diagram showing a principle of constant power control implemented by a multiplier in the related art;

2 is an output characteristic curve according to an embodiment of the present invention;

3 is a block diagram showing the structure of a power control device according to an embodiment of the present invention;

4 is a block diagram 1 of a power control apparatus according to an embodiment of the present invention;

FIG. 5 is a structural block diagram 2 of a power control apparatus according to an embodiment of the present invention; FIG.

6 is a structural block diagram 3 of a power control apparatus according to an embodiment of the present invention;

7 is a structural block diagram 4 of a power control apparatus according to an embodiment of the present invention;

FIG. 8 is a flowchart of a power control method according to an embodiment of the present invention; FIG.

9 is a schematic block diagram of constant power control in accordance with an embodiment of the present invention.

detailed description

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

In the present embodiment, a power control device is provided, which is configured to implement the above-described embodiments and preferred embodiments, and has not been described again. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

3 is a structural block diagram of a power control apparatus according to an embodiment of the present invention. As shown in FIG. 3, the power control apparatus includes: a current loop module 32, a voltage loop module 34, and a processing module 36, and a current loop module 32. And configured to sample the output current of the power supply, and output the sampled sampling current to the processing module 36; and receive the reference current signal from the processing module 36, and adjust the output current of the power supply according to the reference current signal; and/or the voltage The loop module 34 is configured to sample the output voltage of the power supply, and output the sampled sampling voltage to the processing module 36; and receive the reference voltage signal from the processing module 36, and adjust the output voltage of the power supply according to the reference voltage signal; The processing module 36 is configured to obtain a current output power according to the sampling voltage and/or the sampling current, and generate a reference current signal and/or a reference voltage signal according to a comparison result between the current output power and a preset constant power threshold, wherein the preset constant power is generated. The threshold is a power value at which the power source maintains a constant power within a preset power range, and the reference current signal And/or the reference voltage signal is used to adjust the power of the power supply to remain within a preset power range.

Through the current loop module 32, the voltage loop module 34 and the processing module 36 included in the power control device, the maximum current of the power supply output can be effectively adjusted, and the demand for the constant power of the load is ensured.

4 is a block diagram showing the structure of a power control device according to an embodiment of the present invention. As shown in FIG. 4, the current loop module 32 includes a current sampling circuit 322 connected to the processing module 36 and configured to sample the output current of the power supply. The compensation circuit 324 is connected to the current sampling circuit 322 and is configured to compensate the sampled current obtained by sampling. Thereby the sampling current is obtained.

FIG. 5 is a block diagram showing the structure of a power control apparatus according to an embodiment of the present invention. As shown in FIG. 5, the current loop module 32 includes an operational amplifier circuit 326 connected to the current sampling circuit 322 and the processing module 36, respectively. The sampling current is amplified.

6 is a block diagram 3 of a power control apparatus according to an embodiment of the present invention. As shown in FIG. 6, the voltage loop module 34 includes a voltage sampling circuit 342 connected to the processing module 36 and configured to sample the output voltage of the power supply. The compensation circuit 344 is coupled to the voltage sampling circuit 342 and configured to compensate the sampled voltage obtained by sampling.

7 is a structural block diagram of a power control apparatus according to an embodiment of the present invention. As shown in FIG. 7, the voltage loop module 34 further includes an operational amplifier circuit 346 connected to the voltage sampling circuit and the processing module, and configured as a pair. The sampling voltage is amplified.

In an alternate embodiment, processing module 36 is a microcontroller.

It should be noted that each of the foregoing modules may be implemented by software or hardware. For the latter, the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the above modules are respectively located. In the first processor, the second processor, and the third processor.

A power control method is provided in this embodiment. FIG. 8 is a flowchart of a power control method according to an embodiment of the present invention. As shown in FIG. 8, the process includes the following steps:

Step S802, the processing module acquires a sampling voltage of the power output voltage and/or a sampling current of the output current;

Step S804, the processing module obtains the current output power according to the sampling voltage and/or the sampling current;

Step S806, the processing module generates a reference current signal and/or a reference voltage signal according to a comparison result between the current output power and a preset constant power threshold, wherein the preset constant power threshold is a power value at which the power source maintains a constant power within a preset power range. The reference current signal and/or the reference voltage signal are used to adjust the power of the power source to be maintained within a preset power range;

Step S808, the processing module sends the reference current signal to the current loop module, and/or sends the reference voltage signal to the voltage loop module.

Through the above steps, the processing module can effectively adjust the maximum current of the power output according to the preset constant power threshold, the sampling voltage and the sampling current, thereby ensuring the requirement of the load constant power. Wherein, in an optional embodiment, the processing module can be a single chip microcomputer.

The above step S802 involves the processing module obtaining the sampling current of the power output current. In an optional embodiment, the current sampling circuit samples the output current of the power supply to obtain a sampling current; the compensation circuit compensates the sampling current, and the compensation result is obtained. Send to the processing module.

In an alternative embodiment, the current sampling circuit sampling the output current of the power supply further includes the amplifier circuit amplifying the sampling current.

For the above problems in the related art, the following description will be made in conjunction with the optional embodiments, which are combined with the above embodiments and their optional embodiments.

The following takes a single chip microcomputer as an example for explanation.

The optional embodiment realizes the constant power adjustment of the output current within a certain range by the single-chip microcomputer, and the single-chip microcomputer also realizes other control and protection functions, and basically does not increase the cost; at the same time, the current limiting loop is realized by hardware, and the response is relatively fast. In some cases, the current limiting threshold is limited to a certain extent to ensure reliable operation; the invention achieves constant power control through a simple and reliable method.

To achieve the above solution, the present alternative embodiment is implemented by the following means.

The optional embodiment provides a device for switching power supply output constant power control, the device includes: output voltage sampling, output current sampling, voltage loop (corresponding to the above voltage loop module), current loop (corresponding to the above current loop) Road module), constant power regulation.

The output voltage is sampled by a resistor divider to obtain an accurate proportional voltage.

The output current is sampled through a resistor or current sensor to obtain an output current. If the signal is weak, it can be appropriately amplified.

The voltage loop is the loop for output voltage regulation. It is realized by the op amp or chip TL431 (controllable precision voltage regulator source). By adjusting the voltage sampling and voltage reference, the duty cycle of the converter is adjusted to achieve the purpose of voltage regulation.

The current loop is compared with the output current and the reference, allowing the converter to operate in a constant current mode, allowing for certain voltage fluctuations.

Constant power regulation, output voltage sampling and total current sampling to the single-chip microcomputer, preset power supply constant power threshold, single-chip operation, adjust the output current according to the voltage, the actual limit is to adjust the current limit, the current can continue to increase can limit the upper limit, you can also enter Doze protection mode.

FIG. 9 is a schematic block diagram of constant power control according to an embodiment of the present invention. Referring to FIG. 9, the implementation method of the alternative embodiment will be described in detail below.

After the output voltage Vo is divided by the resistors R1 and R2, it is sent to the input-end of the operational amplifier D2, compared with the voltage reference, and forms a voltage loop with the peripheral compensation network to realize the output voltage regulation function;

R3 is the total output current sampling. After being amplified by the high-performance amplifier, it is sent to the input-end of the operational amplifier D1, compared with the current reference, and combined with the peripheral compensation network to form a current loop to realize the output constant current function;

The voltage sampling signal and the current sampling signal are simultaneously sent to the MCU (8-bit single-chip microcomputer PIC16F1829). The single-chip microcomputer will do some control and protection processing, and at the same time set the power output power limit to ensure the constant power demand of the load, specifically through the PWM signal of the single-chip microcomputer. The RC filter is converted into an analog level, the reference of the current loop is controlled, and the adjustment precision is also relatively high; the high-precision DAC is omitted to realize the digital-to-analog conversion. At the same time, the current reference can be properly clamped to ensure constant power within a certain range, and the current reaches Imax (see Figure 2). The constant current threshold is no longer adjusted to ensure the reliability of the power supply.

The current loop and voltage loop op amp output control the COM pin of the PWM controller through the diodes VD1, VD2, and adjust the PWM signal of the DC-DC converter to achieve voltage regulation or constant current control.

Another multi-output power supply controls the total current and total power to ensure that the power output does not exceed the power and does not require separate control. Especially with the battery, the output voltage will be clamped by the battery. When the output voltage is fed by the battery, the constant current point is fixed, and the maximum output power will be reduced, which cannot meet the power supply requirement. This alternative embodiment can solve this problem. .

In summary, with the optional embodiment, the MCU is a unit for controlling and protecting the power supply, and basically does not need other external chips, and can realize constant power control at the same time, avoiding the cost increase by using the multiplier.

In another embodiment, software is also provided for performing the technical solutions described in the above embodiments and preferred embodiments.

In another embodiment, a storage medium is further provided, wherein the software includes the above-mentioned software, including but not limited to: an optical disk, a floppy disk, a hard disk, an erasable memory, and the like.

It will be apparent to those skilled in the art that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

As described above, a power control method and apparatus provided by an embodiment of the present invention have the following beneficial effects: solving the problem that the constant power can not be effectively controlled in the related art, and achieving effective control of constant power is achieved. effect.

Claims

A power control device includes: a current loop module, a voltage loop module, and a processing module,

The current loop module is configured to sample an output current of the power supply, and output the sampled sampling current to the processing module; and receive a reference current signal from the processing module, and according to the reference current signal Adjusting the output current of the power supply; and/or

The voltage loop module is configured to sample an output voltage of the power supply, and output the sampled sampling voltage to the processing module; and receive a reference voltage signal from the processing module, and according to the reference The voltage signal adjusts an output voltage of the power source;

The processing module is configured to obtain a current output power according to the sampling voltage and/or the sampling current, and generate the reference current signal and/or according to a comparison result between the current output power and a preset constant power threshold. a reference voltage signal, wherein the predetermined constant power threshold is a power value at which the power source maintains a constant power within a preset power range, and the reference current signal and/or the reference voltage signal is used to adjust the power source The power is maintained within the preset power range.
The apparatus of claim 1 wherein said current loop module comprises:

a current sampling circuit connected to the processing module and configured to sample an output current of the power source;

A compensation circuit is coupled to the current sampling circuit and configured to compensate the sampled current obtained by sampling.
The device of claim 2, wherein the current loop module further comprises:

An operational amplifier circuit is coupled to the current sampling circuit and the processing module and configured to amplify the sampling current.
The apparatus of claim 1 wherein said voltage loop module comprises:

a voltage sampling circuit connected to the processing module and configured to sample an output voltage of the power source;

A compensation circuit is coupled to the voltage sampling circuit and configured to compensate the sampled voltage obtained by sampling.
The device of claim 4, wherein the voltage loop module further comprises:

An op amp circuit is coupled to the voltage sampling circuit and the processing module and configured to amplify the sampling voltage.
The apparatus according to any one of claims 1 to 5, wherein the processing module is a single chip microcomputer.
A power control method includes:

The processing module obtains a sampling voltage of the power output voltage and/or a sampling current of the output current;

The processing module obtains a current output power according to the sampling voltage and/or the sampling current;

The processing module generates a reference current signal and/or a reference voltage signal according to a comparison result between the current output power and a preset constant power threshold, wherein the preset constant power threshold is that the power source is maintained within a preset power range a constant power value, the reference current signal and/or the reference voltage signal used to adjust the power of the power source to remain within the preset power range;

The processing module transmits the reference current signal to a current loop module and/or transmits the reference voltage signal to a voltage loop module.
The method of claim 7, wherein the processing module acquires the sampling current of the power output current comprises:

The processing module receives a current that is sampled by the current sampling circuit and that compensates for the sampled current by the compensation circuit.
The method of claim 8, wherein the current sampling circuit further comprises: amplifying the sampling current by an operational amplifier circuit before sampling the output current.
The method according to any one of claims 7 to 9, wherein the processing module is a single chip microcomputer.