阅读说明：本技术 降低磁平衡式霍尔电流传感器功耗的方法及传感器 (Method for reducing power consumption of magnetic balance type Hall current sensor and sensor ) 是由 潘飞蹊 罗洪亮 于 2021-07-09 设计创作，主要内容包括：本发明申请提供了一种降低磁平衡式霍尔电流传感器功耗的方法及传感器,所述霍尔电流传感器包括：霍尔元件、磁回路、缠绕于所述磁回路上的反馈电流线圈、后级放大器以及开关控制信号模块；所述方法包括：所述霍尔元件置于所述磁回路中,检测所置环境的磁感应强度；所述霍尔元件检测出的电信号经所述放大后形成反馈控制信号；所述反馈控制信号输入所述开关控制信号模块进行离散化处理形成开关控制信号,驱动所述反馈电流线圈,实现对所述磁回路的磁平衡控制。本方法将所述磁回路和所述反馈电流线圈视为一个电感,用所述离散化的开关信号进行驱动,可以有效地降低所述传感器的功耗。(The invention provides a method and a sensor for reducing the power consumption of a magnetic balance type Hall current sensor, wherein the Hall current sensor comprises the following components: the circuit comprises a Hall element, a magnetic loop, a feedback current coil wound on the magnetic loop, a post amplifier and a switch control signal module; the method comprises the following steps: the Hall element is arranged in the magnetic loop and used for detecting the magnetic induction intensity of the arranged environment; the electric signal detected by the Hall element forms a feedback control signal after being amplified; and the feedback control signal is input into the switch control signal module to be discretized to form a switch control signal, and the switch control signal drives the feedback current coil to realize the magnetic balance control of the magnetic loop. According to the method, the magnetic loop and the feedback current coil are regarded as an inductor and are driven by the discretized switching signal, so that the power consumption of the sensor can be effectively reduced.)

1. A method for reducing power consumption of a magnetic balance type Hall current sensor is characterized in that the current sensor comprises a Hall element, a magnetic loop, a feedback current coil wound on the magnetic loop, a post-stage amplifier and a switch control signal module; the method comprises the following steps:

the Hall element is arranged in the magnetic loop and used for detecting the magnetic induction intensity of the arranged environment;

the electric signal detected by the Hall element is amplified by the post amplifier to form a feedback control signal;

the feedback control signal is input into the switch control signal module to be subjected to discretization processing to form a switch control signal;

the switching signal drives the feedback current coil to realize magnetic balance control in the magnetic loop.

2. The method of claim 1, comprising at least one hall chip for detecting magnetic induction in a surrounding environment.

3. The method of claim 1, comprising at least one magnetic circuit having at least one set of feedback current coils wound thereon.

4. The method of claim 1, comprising at least one post-amplifier for amplifying the electrical signal detected by the hall element.

5. The method of claim 1, comprising at least one switching control signal module for discretizing an output signal of the post-amplifier to form a switching control signal for driving the feedback current coil.

6. A magnetic balance type Hall current sensor is characterized by comprising a Hall element, a magnetic loop, a feedback current coil wound on the magnetic loop, a post-stage amplifier and a switch control signal module;

the current to be measured passes through the core in the magnetic loop;

the Hall element is arranged in the magnetic loop and used for detecting the magnetic induction intensity of the arranged environment;

the post amplifier is used for amplifying the electric signal detected by the Hall element to form a feedback control signal;

the switch control signal module is used for carrying out discretization processing on the feedback control signal to form a switch control signal;

the feedback current coil is used for realizing magnetic balance control in the magnetic loop based on the driving of the switch control signal; and the current in the feedback coil is used for the current value to be measured.

Technical Field

The invention relates to the field of electronic circuits, in particular to a method for reducing power consumption of a magnetic balance type Hall current sensor and the sensor.

Background

The classical hall effect is a magnetoelectric effect discovered by the american physicist hall (e.h.hall) in 1879 and is named after it. In modern industry, semiconductor elements (called hall elements) manufactured by using hall effect are widely used in automation technology, detection technology, information processing, and the like.

The Hall effect is utilized to detect the magnetic induction intensity of the environment where the Hall element is located, the typical application is in the field of current measurement, and a related product is a Hall current sensor. The Hall sensors are divided into two types, namely a linear Hall sensor and a switch type Hall sensor. The linear Hall sensor comprises an open-loop current sensor and a closed-loop current sensor, and the Hall closed-loop current sensor is also called a magnetic balance type current sensor. Among them, the linear hall sensor is widely used because of its wide magnetic field working range and its characteristics of being hardly influenced by vibration, moisture, dust, oil film or environmental factors such as environmental illumination, especially the magnetic balance type current sensor.

To better illustrate the features and advantages of the present invention, a brief description of the "linear" and "switching" features of electronics is provided.

Suppose there is a voltage (or current) converter with an input voltage (usually the supply voltage) of V_CCThe output voltage is Vo and the output current is I_O。

1. If the converter is a "linear conversion" scheme, the power consumed by the power supply (P) is ideally at least:

P＝|V_CC×Io| (1)

the conversion efficiency (denoted as η) at this time is at most:

2. if the converter is a "switching" scheme, the conversion efficiency is ideally at most 100%, and the power (P) consumed by the power supply is at least:

P＝|Vo×Io| (3)

the features of the above two variants are well known in the art of electronics and will not be discussed in detail here. The two variants are distinguished by numerous applications and comparative examples in the field of electronics: for example, in audio power amplifiers, class a, B and AB power amplifiers are equivalent to "linear conversion", and thus are far less efficient than class D power amplifiers, which are equivalent to "switch conversion".

It is also emphasized that in electronics, all "switching transitions" require at least one "transition inductance"; the efficient energy conversion of all "switching conversion" schemes is essentially based on the energy storage characteristics of the "conversion inductance".

Fig. 1 is a schematic diagram of a conventional magnetic balance type hall current sensor, which includes: a magnetic circuit 11, a Hall element 12, a post amplifier 13 and a feedback current coil 14 wound on the magnetic circuit 11.

Wherein the magnetic circuit 11 is made of magnetic material, and the current I to be measured_XTypically a single turn is threaded through the magnetic circuit 11; the Hall element 12 is disposed in the magnetic loop 11, the output signal of the Hall element 12 is detected and amplified by the post-amplifier 13, and then drives the feedback current coil 14, and generates a feedback current I in the feedback current coil 14_F。

At this time, the magnetic induction intensity in the magnetic loop 11 is the current I to be measured_XThe generated magnetic induction and the feedback current I_FThe superposition of the magnetic induction intensities generated. By negative feedback control, so that the magnetic induction intensity in the magnetic loop 11 is always zero (or a constant value), the current I in the feedback current coil can be used_FTo characterize the current I to be measured_XThe value of (c). The current detection method is also called "zero flux (or constant flux)" control.

By adopting the control method, the current I in the feedback current coil_FProportional to the current I to be measured_XIf the number of turns of the feedback current coil is N, the following steps are performed:

it must be emphasized here that in the above conventional control method, the feedback in the feedback current coil 14Current I_FIs generated by means of a so-called "linear transformation" in electronics, in order to provide the required feedback current I_FThe power consumed by the power supply is:

wherein, V_CCIs the supply voltage; p is the power consumed by the power supply.

Therefore, the power consumption and the current I to be measured at the moment_XFeedback current coil turn number N and supply voltage V_CCIn this regard, large power consumption occurs, particularly when large current measurements are taken.

Disclosure of Invention

In view of the above, on the basis of the traditional control method, the invention provides a method for reducing the power consumption of a magnetic balance type hall current sensor, and the basic idea is to adopt a 'switching conversion' method to generate the current I in a feedback current coil_F(ii) a Since the 'switching conversion' has high conversion efficiency which is incomparable with the 'linear conversion', the power consumption of the circuit can be effectively reduced.

In one possible implementation manner, the current sensor comprises a hall element, a magnetic loop, a feedback current coil wound on the magnetic loop, a post-stage amplifier and a switch control signal module; the method for reducing the power consumption of the magnetic balance type Hall current sensor comprises the following steps:

the Hall element is arranged in the magnetic loop and used for detecting the magnetic induction intensity of the arranged environment;

the electric signal detected by the Hall element is amplified by the post amplifier to form a feedback control signal;

the feedback control signal is input into the switch control signal module to be subjected to discretization processing to form a switch control signal;

the switching signal drives the feedback current coil to realize magnetic balance control in the magnetic loop.

In the method of the present invention, compared with the conventional method, a switch control signal module is added; the switch control signal module is used for discretizing the feedback control signal output by the post amplifier to form a switch control signal; and driving the feedback current coil by using the switching signal, and generating required feedback current in the feedback current coil to realize magnetic balance control in the magnetic loop.

Here, the magnetic loop and the feedback current coil can be collectively regarded as one inductor, which directly corresponds to a "conversion inductor" required in "switching conversion", so that no extra "conversion inductor" is actually required to be added to the circuit, and thus, no excessive hardware cost is required to be added.

According to the characteristics, the invention adopts a 'switching conversion' method to generate the current in the feedback current coil, so that the power consumption of the circuit can be effectively reduced.

The following points are additionally explained:

1. the method for reducing the power consumption of the magnetic balance type Hall current sensor comprises at least one Hall chip and is used for detecting the magnetic induction intensity of the environment where the Hall chip is arranged. In the conventional technical scheme, a plurality of Hall chips can be arranged in a magnetic loop, and the offset voltage of the Hall chips is eliminated (or reduced) through a specific connection mode, so that the measurement is stable. This solution is equally applicable to the proposed method.

2. The method for reducing the power consumption of the magnetic balance type Hall current sensor comprises at least one magnetic loop, wherein at least one group of feedback current coils are wound on the magnetic loop. In a conventional technical solution, for example, in an application scenario of a single power supply, a plurality of sets of feedback current coils may be wound on a magnetic circuit, and control of a magnetomotive force direction generated by a feedback current is realized by adjusting winding directions of the plurality of sets of feedback current coils. This solution is equally applicable to the proposed method.

3. Six basic structures (Buck, Boost, Buck-Boost, Cuk, Sepic and Zeta) of the switching converter and derivative structures thereof are all suitableAre used in the present invention. If an electronic switch group structure (Boost, Buck-Boost, Cuk, Sepic, Zeta and derivative structures thereof) with a boosting function is adopted, the method provided by the invention is equivalent to the method for enabling the output of the sensor to have a larger dynamic voltage output range; compared with the traditional control method, the same feedback current I is generated when needed_FIn this case, the sensor can now operate at a lower supply voltage.

In one possible implementation manner, the magnetic balance type hall current sensor comprises a hall element, a magnetic loop, a feedback current coil wound on the magnetic loop, a post-stage amplifier and a switch control signal module;

the current to be measured passes through the core in the magnetic loop;

the Hall element is arranged in the magnetic loop and used for detecting the magnetic induction intensity of the arranged environment;

the post amplifier is used for amplifying the electric signal detected by the Hall element to form a feedback control signal;

the switch control signal module is used for carrying out discretization processing on the feedback control signal to form a switch control signal;

the feedback current coil is used for realizing magnetic balance control in the magnetic loop based on the driving of the switch control signal; and the current magnitude in the feedback coil represents the current value to be measured.

The magnetic loop and the feedback current coil are collectively regarded as an inductor, and are driven by the switch control signal, namely, the required feedback current is generated in the feedback current coil by switching conversion, so that the power consumption of the sensor can be reduced.

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 embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only 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 inventive exercise.

FIG. 1 is a schematic diagram of a conventional magnetic balance type current sensor;

fig. 2 is a schematic structural diagram of a magnetic balanced current sensor according to an embodiment of the present invention;

fig. 3 is a schematic diagram illustrating the structure and operation principle of a switch control signal module according to an embodiment of the present invention;

FIG. 4 is a flow chart illustrating a method for reducing power consumption of a magnetic balanced current sensor according to an embodiment of the present invention;

reference numerals:

11. a magnetic circuit;

12. a Hall element;

13. a post-stage amplifier;

14. a feedback current coil;

21. a magnetic circuit;

22. a Hall element;

23. a post-stage amplifier;

24. a switch control signal module;

25. a feedback current coil;

241. a comparator;

242. and an electronic switch group.

Detailed Description

In order to make the technical solution better understood by those skilled in the art, the technical solution in the embodiment of the present invention will be clearly described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is a part of the embodiment of the present invention, and not a whole embodiment. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present disclosure without any creative effort shall fall within the protection scope of the present disclosure.

The terms "include" and any other variations in the description and claims of this document and the above-described figures, mean "include but not limited to", and are intended to cover non-exclusive inclusions and not limited to the examples listed herein. Furthermore, the terms "first" and "second," etc. are used to distinguish between different objects and are not used to describe a particular order.

The invention aims to reduce power consumption by improving the magnetic balance type current sensor.

The following detailed description of implementations of the invention refers to the accompanying drawings in which:

fig. 2 is a schematic structural diagram of a magnetic balance type current sensor according to an embodiment of the present invention, where the magnetic balance type current sensor includes: a magnetic loop 21, a hall element 22, a post amplifier 23, a switch control signal module 24 and a feedback current coil 25.

The hall element 22 is disposed in the magnetic circuit 21, and the hall element 22, the post-stage amplifier 23, the switch control signal module 24, and the feedback current coil 25 are connected in sequence.

The feedback current coil 25 is wound on the magnetic loop 21, and the current to be measured flows through the core of the magnetic loop 21.

And the Hall element 22 is used for detecting the magnetic induction intensity of the placed environment and outputting a detection signal. Wherein the detection signal is an electrical signal.

And a post-amplifier 23 for amplifying the detection signal to generate a feedback control signal.

And a switch control signal module 24, configured to perform discrete processing on the feedback control signal to generate a switch control signal. Compared with the conventional magnetic balance type current sensor in fig. 1, the output signal of the post-stage amplifier 23 is not directly used for controlling the feedback current coil 25, but is input to the switch control signal module 24 as a modulation signal, and the output signal of the post-stage amplifier 23 is discretized by the switch control signal module 24 to form a switch control signal, so as to control and drive the feedback current coil 25.

And a feedback current coil 25 for generating a feedback current and implementing magnetic balance control. The feedback current in the feedback current coil 25 is controlled through negative feedback, so that the magnetic induction intensity in the magnetic loop 11 is always zero (or a fixed value), and the current to be measured can be represented through the current in the feedback current coil.

The magnetic loop 21 and the feedback current coil 25 are collectively regarded as an inductor, and the driving by the switching control signal is equivalent to "switching conversion" for realizing the generation of the required feedback current in the feedback current coil 25, so that the power consumption of the circuit can be reduced.

Fig. 3 is a schematic diagram illustrating a structure and an operation principle of a switch control signal module according to an embodiment of the present invention, wherein the switch control signal module 24 includes a comparator 241.

The inputs of the comparator 241 are connected to the post-amplifier 23 and the alternating signal, respectively.

A comparator 241 for generating a discrete switching control signal based on comparing the amplified electrical signal with the alternating signal.

An output terminal of the comparator 241 is configured to output a switch control signal.

In some embodiments, the alternating signal is a triangular wave or a sawtooth wave. The alternating signal shown in fig. 3 is a triangular wave.

In some embodiments, the switch control signal module 24 also includes an electronic switch bank 242 (shown in fig. 3). The electronic switch set 242 is connected to the output terminal of the comparator 241 for enhancing the driving capability of the switch control signal.

In some embodiments, the number of the switch control signal modules is one or more, and the switch control signal modules are used for performing discrete processing or multi-stage discrete processing on the feedback control signal.

The discretization processing method shown in fig. 3 is to discretize the output signal of the post-amplifier 23 by a common pulse width modulation technique to form a switching control signal.

In other embodiments, the discretized modulation may be based on techniques such as frequency modulation or on-time control.

Fig. 4 is a flowchart illustrating a method for reducing power consumption of a magnetic balanced current sensor according to an embodiment of the present invention, where, as shown in fig. 4, the method includes the following steps:

s401, the Hall element is arranged in the magnetic loop, and the magnetic induction intensity of the arranged environment is detected.

And S402, amplifying the electric signal detected by the Hall element through a post amplifier to form a feedback control signal.

And S403, inputting the feedback control signal into the switch control signal module, and performing discretization processing to form a switch control signal.

And S404, driving a feedback current coil by the switching signal to realize magnetic balance control in the magnetic loop.

It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.