阅读说明：本技术 电能测量装置及其电流测量机构 (Device for measurement of electrical energy and its current measurement mechanism ) 是由 王甲 石飞 傅代军 陈立军 于 2019-09-17 设计创作，主要内容包括：本发明公开了一种电能测量装置及其电流测量机构,电流测量机构包括磁芯、霍尔元件、绝缘层、控制模块、至少两组不同匝数比的副边补偿线圈和至少两个副边驱动模块；副边驱动模块用于根据霍尔元件输出的霍尔电流生成目标副边补偿电流,并将目标副边补偿电流输入至副边补偿线圈；控制模块用于获取目标副边补偿电流,并根据目标副边补偿电流获取目标原边电流。本发明实现了扩大电流测量范围以及电压测量范围；同时,通过基准电路、电流输出电路、电压输出电路实现对电能测量装置的自动校准,自动完成了消磁,消除了电能测量装置中存在的误差,提高了测量精度。(The invention discloses a kind of device for measurement of electrical energy and its current measurement mechanism, current measurement mechanism includes magnetic core, Hall element, insulating layer, control module, the secondary drive module when bucking coil and at least two are secondary of at least two groups difference turn ratio；It is secondary to be used to compensate electric current according to Hall element when the Hall current that export generates target pair in drive module, and by target pair when compensation electric current is input to secondary bucking coil；Control module compensates electric current according to target pair side and obtains target primary current for obtaining target pair side compensation electric current.The present invention, which realizes, expands current measuring range and voltage measurement range；Meanwhile the automatic calibration to device for measurement of electrical energy is realized by reference circuit, current output circuit, voltage follower circuit, it has been automatically performed demagnetization, error present in device for measurement of electrical energy has been eliminated, improves measurement accuracy.)

1. a kind of current measurement mechanism, which is characterized in that the current measurement mechanism includes magnetic core, Hall element, insulating layer, control The secondary drive module when bucking coil and at least two are secondary of molding block, at least two groups difference turn ratio；

The magnetic core is equipped with open slot, and the Hall element is placed in the open slot；

Each secondary side bucking coil is wrapped on the magnetic core, by described between the different secondary side bucking coils Insulating layer is isolated；

Wherein, each secondary drive module when bucking coil corresponding one described secondary；

The input terminal of pair side drive module is electrically connected with the Hall element, the output end of pair side drive module and institute State the input terminal electrical connection of secondary side bucking coil；

The secondary Hall current for being used to be exported according to the Hall element in drive module compensates electric current when generating target pair, and By the target pair while compensate electric current be input to it is described pair while bucking coil；

Wherein, the working condition that compensation electric current in target pair side is used to that the Hall element to be kept to be in Zero flux；

Corresponding first current measuring range of the secondary side bucking coil of different turn ratios constitutes target current measurement range；

The target current measurement range includes first current measuring range；

The control module is electrically connected with the output end of each secondary side drive module；

The control module compensates electric current according to target pair side and obtains mesh for obtaining target pair side compensation electric current Mark primary current.

2. current measurement mechanism as described in claim 1, which is characterized in that the control module is used in the target primary side When electric current is more than the secondary side bucking coil of currently open described corresponding current measuring range, then it is continuous to control other measurement ranges The secondary side bucking coil of setting quantity open work.

3. current measurement mechanism as described in claim 1, which is characterized in that the control module include D/A conversion unit and Computing unit；

The target pair side compensation electric current that the D/A conversion unit is used to will acquire carries out digital-to-analogue conversion, and by digital-to-analogue conversion Target pair side compensation electric current afterwards is sent to the computing unit；

The target primary current is calculated according to the target pair side compensation electric current after digital-to-analogue conversion in the computing unit.

4. current measurement mechanism as described in claim 1, which is characterized in that pair side drive module includes amplifier；

The input terminal of the amplifier is electrically connected with the Hall element, the output end of the amplifier and the secondary side compensating line The input terminal of circle is electrically connected；

The amplifier is used to amplify the Hall current that the Hall element exports and handles and be sent to the pair Side bucking coil.

5. current measurement mechanism as claimed in claim 4, which is characterized in that pair side drive module further includes the one or three pole Pipe, the second triode and first resistor；

The output end of the amplifier is electrically connected with the base stage of the base stage of first triode and second triode respectively；

The collector of the collector of first triode and second triode is electrically connected with power end；

Input of the emitter of the emitter of first triode and second triode with the secondary side bucking coil End electrical connection；

The collector of the collector of first triode and second triode is for exporting target pair side compensation electricity Stream, and by the target pair while compensate electric current be input to it is described pair while bucking coil input terminal；

The other end of pair side bucking coil is electrically connected with one end of the first resistor, another termination of the first resistor Ground.

6. a kind of device for measurement of electrical energy, which is characterized in that the device for measurement of electrical energy includes any one of claim 1 to 5 The current measurement mechanism；

Wherein, the target primary current is the electric current on the first electrified wire of the magnetic core.

7. device for measurement of electrical energy as claimed in claim 6, which is characterized in that the control module is used for former according to the target The performance parameter of the equipment under test is calculated in the voltage signal of side electric current and equipment under test；

Wherein, the performance parameter includes power and/or electric energy.

8. device for measurement of electrical energy as claimed in claim 7, which is characterized in that the device for measurement of electrical energy further includes the first benchmark Circuit, the first enabled control circuit and current output circuit；

The calibration current value is input to the second electrified wire for generating calibration current value by first reference circuit；

Wherein, second electrified wire passes through the magnetic core；

It is described it is secondary compensate electric current when drive module is used for according to calibration current value output the first calibration pair, and by described the One, which calibrates secondary side compensation electric current, is input to the control module；

The control module, which is used to calibrate secondary side compensation electric current according to described first, obtains second electrified wire corresponding the One electric current, and calculate the first difference between first electric current and the calibration current value, be greater than when first difference or When person is equal to the first given threshold, then generates the first control instruction and be sent to the described first enabled control circuit；

The first enabled control circuit is used to control the current output circuit to the pair according to first control instruction The input terminal of side bucking coil inputs setting electric current, until first difference is less than first given threshold.

9. device for measurement of electrical energy as claimed in claim 8, which is characterized in that the device for measurement of electrical energy further includes the first communication Interface circuit and the first power circuit；

First communication interface circuit is electrically connected with the control module；

First communication interface circuit is set for obtaining the corresponding performance parameter of the equipment under test and exporting to outside It is standby；

First power circuit is used to power to the device for measurement of electrical energy.

10. a kind of device for measurement of electrical energy, which is characterized in that the device for measurement of electrical energy includes any one of claim 1 to 5 The current measurement mechanism；

The current measurement mechanism further includes the primary coil of at least two different turn ratios；

It is isolated between the different primary coils by the insulating layer；

Wherein, the corresponding first voltage measurement range of the primary coil of different turn ratios constitutes target voltage measurement range；

The target voltage measurement range includes the first voltage measurement range；

The target primary current is the electric current in the primary coil；

The control module is used to obtain the corresponding target voltage of equipment under test according to the target primary current.

11. device for measurement of electrical energy as claimed in claim 10, which is characterized in that the control module is used for according to described tested The performance parameter of the equipment under test is calculated in the target voltage of equipment and the target primary current；

Wherein, the performance parameter includes power and/or electric energy.

12. device for measurement of electrical energy as claimed in claim 11, which is characterized in that be wound with the school for calibration on the magnetic core Quasi- primary coil；

The device for measurement of electrical energy further includes the second reference circuit, the second enabled control circuit and voltage follower circuit；

The calibration voltage value is input to the calibration primary side line for generating calibration voltage value by second reference circuit Circle；

It is described it is secondary compensate electric current when drive module is used for secondary according to the second calibration of calibration voltage value output, and by described the Two, which calibrate secondary side compensation electric current, is input to the control module；

The control module, which is used to calibrate secondary side compensation electric current according to described second, obtains the calibration primary coil corresponding the Two electric currents, and the first voltage value is obtained according to second electric current；

The control module is also used to calculate the second difference between the first voltage value and the calibration voltage value, when described When second difference is more than or equal to the second given threshold, then generating the second control instruction and being sent to described second makes can control Circuit；

The second enabled control circuit is used to control the voltage follower circuit to the original according to second control instruction Input setting voltage in the circle of sideline, until second difference is less than second given threshold.

13. device for measurement of electrical energy as claimed in claim 12, which is characterized in that the device for measurement of electrical energy further includes second logical Believe interface circuit and second source circuit；

Second communication interface circuit is electrically connected with the control module；

Second communication interface circuit is set for obtaining the corresponding performance parameter of the equipment under test and exporting to outside It is standby；

The second source circuit is used to power to the device for measurement of electrical energy.

Technical field

The present invention relates to technical field of integrated circuits, in particular to a kind of device for measurement of electrical energy and its current measurement mechanism.

Background technique

Currently, mainly measuring the direct current energy of equipment under test consumption by the following two kinds mode: being measured based on sampling resistor Direct current energy and pass through closed loop hall measurement direct current energy.

It is easily easy to accomplish although circuit structure is simple for the measuring circuit based on sampling resistor measurement direct current energy The measurement of direct current energy；But there are the following problems for meeting in long-term measurement for this measurement method: since direct current is direction Immovable electric current, according to Ampere's law, sampling resistor nearby can always exist a magnetic field, in long-term operation, due to The presence in magnetic field, sampling resistor can adsorb charged ion or attachment in surrounding air, to cause the resistance of sampling resistor Value changes, and the current sample of such sampling resistor will have error, since current sampling signal is a very small signal, Usually only several millivolts can be eventually led to between tens millivolts, therefore since sampling resistor changes bring sampling error The significant errors of metering, the problem of causing low measurement accuracy.

For passing through the measuring circuit of closed loop hall measurement direct current energy, although it is long to solve above-mentioned sampling resistor substantially Trueness error drift bring metering misalignment problem occurs in D.C. magnetic field for the phase, and still, which can exist asks as follows Topic: 1) measurement range is smaller, cannot meet the actual needs；2) closed-loop sensors of Hall in use for some time, school Quasi- good zero point can shift, that is, magnetize phenomenon, so that measurement error be caused to always exist, causes low measurement accuracy The problem of.

Summary of the invention

The technical problem to be solved by the present invention is in order to overcome in the prior art electric energy measurement circuit there are measurement range compared with The defects of small, low measurement accuracy, provides a kind of device for measurement of electrical energy and its current measurement mechanism.

The present invention is to solve above-mentioned technical problem by following technical proposals:

The present invention provides a kind of current measurement mechanism, the current measurement mechanism include magnetic core, Hall element, insulating layer, Control module, the secondary drive module when bucking coil and at least two are secondary of at least two groups difference turn ratio；

The magnetic core is equipped with open slot, and the Hall element is placed in the open slot；

Each secondary side bucking coil is wrapped on the magnetic core, is passed through between the different secondary side bucking coils The insulating layer is isolated；

Wherein, each secondary drive module when bucking coil corresponding one described secondary；

The input terminal of pair side drive module is electrically connected with the Hall element, the output end of pair side drive module It is electrically connected with the input terminal of the secondary side bucking coil；

The secondary Hall current for being used to be exported according to the Hall element in drive module compensates electricity when generating target pair Stream, and by the target pair while compensate electric current be input to it is described pair while bucking coil；

Wherein, the working condition that compensation electric current in target pair side is used to that the Hall element to be kept to be in Zero flux；

Corresponding first current measuring range of the secondary side bucking coil of different turn ratios constitutes target current and measures model It encloses；

The target current measurement range includes first current measuring range；

The control module is electrically connected with the output end of each secondary side drive module；

The control module compensates electric current according to target pair side and obtains for obtaining target pair side compensation electric current Take target primary current.

Preferably, the control module is used in the target primary current be more than the secondary side compensating line currently opened When enclosing corresponding current measuring range, then the secondary side bucking coil unlatching that other measurement ranges continuously set quantity is controlled Work.

Preferably, the control module includes D/A conversion unit and computing unit；

The target pair side compensation electric current that the D/A conversion unit is used to will acquire carries out digital-to-analogue conversion, and by digital-to-analogue Target pair side compensation electric current after conversion is sent to the computing unit；

The target primary side is calculated according to the target pair side compensation electric current after digital-to-analogue conversion in the computing unit Electric current.

Preferably, pair side drive module includes amplifier；

The input terminal of the amplifier is electrically connected with the Hall element, and the output end of the amplifier and the secondary side are mended Repay the input terminal electrical connection of coil；

The amplifier is used to amplify the Hall current that the Hall element exports and handles and be sent to institute State secondary side bucking coil.

Preferably, pair side drive module further includes the first triode, the second triode and first resistor；

The output end of the amplifier is electric with the base stage of first triode and the base stage of second triode respectively Connection；

The collector of the collector of first triode and second triode is electrically connected with power end；

The emitter of the emitter of first triode and second triode with the secondary side bucking coil Input terminal electrical connection；

The collector of the collector of first triode and second triode is for exporting target pair side benefit Repay electric current, and by the input terminal of target pair bucking coil when compensating electric current and being input to the pair；

The other end of the pair side bucking coil is electrically connected with one end of the first resistor, the first resistor it is another End ground connection.

The present invention also provides a kind of device for measurement of electrical energy, the device for measurement of electrical energy includes above-mentioned current measurement mechanism；

Wherein, the target primary current is the electric current on the first electrified wire of the magnetic core.

Preferably, the control module according to the voltage signal of the target primary current and equipment under test for calculating To the performance parameter of the equipment under test；

Wherein, the performance parameter includes power and/or electric energy.

Preferably, the device for measurement of electrical energy further includes the first reference circuit, the first enabled control circuit and electric current output Circuit；

The calibration current value is input to the second energization and led by first reference circuit for generating calibration current value Line；

Wherein, second electrified wire passes through the magnetic core；

It is described it is secondary compensate electric current when drive module is used for according to calibration current value output the first calibration pair, and by institute It states the first calibration pair side compensation electric current and is input to the control module；

The control module is used to calibrate secondary side compensation electric current acquisition second electrified wire according to described first corresponding The first electric current, and calculate first electric current and it is described calibration current value between the first difference, when first difference is big When the first given threshold, then generates the first control instruction and be sent to the described first enabled control circuit；

The first enabled control circuit is used to control the current output circuit to institute according to first control instruction The input terminal input setting electric current for stating secondary side bucking coil, until first difference is less than first given threshold.

Preferably, the device for measurement of electrical energy further includes the first communication interface circuit and the first power circuit；

First communication interface circuit is electrically connected with the control module；

First communication interface circuit is for obtaining the corresponding performance parameter of the equipment under test and exporting to outer Portion's equipment；

First power circuit is used to power to the device for measurement of electrical energy.

The present invention also provides a kind of device for measurement of electrical energy, the device for measurement of electrical energy includes above-mentioned current measurement mechanism；

The current measurement mechanism further includes the primary coil of at least two different turn ratios；

It is isolated between the different primary coils by the insulating layer；

Wherein, the corresponding first voltage measurement range of the primary coil of different turn ratios constitutes target voltage and measures model It encloses；

The target voltage measurement range includes the first voltage measurement range；

The target primary current is the electric current in the primary coil；

The control module is used to obtain the corresponding target voltage of equipment under test according to the target primary current.

Preferably, the control module is used for according to the target voltage of the equipment under test and target primary side electricity Stream calculation obtains the performance parameter of the equipment under test；

Wherein, the performance parameter includes power and/or electric energy.

Preferably, being wound with the calibration primary coil for calibration on the magnetic core；

The device for measurement of electrical energy further includes the second reference circuit, the second enabled control circuit and voltage follower circuit；

Second reference circuit is input to the calibration original for generating calibration voltage value, and by the calibration voltage value Sideline circle；

It is described it is secondary compensate electric current when drive module is used for secondary according to the second calibration of calibration voltage value output, and by institute It states the second calibration pair side compensation electric current and is input to the control module；

The control module is used to calibrate the secondary side compensation electric current acquisition calibration primary coil according to described second corresponding The second electric current, and according to second electric current obtain the first voltage value；

The control module is also used to calculate the second difference between the first voltage value and the calibration voltage value, when When second difference is more than or equal to the second given threshold, then generates the second control instruction and to be sent to described second enabled Control circuit；

The second enabled control circuit is used to control the voltage follower circuit to institute according to second control instruction Input setting voltage in primary coil is stated, until second difference is less than second given threshold.

Preferably, the device for measurement of electrical energy further includes the second communication interface circuit and second source circuit；

Second communication interface circuit is electrically connected with the control module；

Second communication interface circuit is for obtaining the corresponding performance parameter of the equipment under test and exporting to outer Portion's equipment；

The second source circuit is used to power to the device for measurement of electrical energy.

The positive effect of the present invention is that:

In the present invention, the secondary side bucking coil of different turn ratios is isolated by insulating layer, realizes and expand electric current survey Measure the purpose of range and voltage measurement range；Meanwhile it being realized by reference circuit, current output circuit, voltage follower circuit Automatic calibration to device for measurement of electrical energy, has been automatically performed demagnetization, eliminates error present in device for measurement of electrical energy, improves Measurement accuracy.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the current measurement mechanism of the embodiment of the present invention 1.

Fig. 2 is the corresponding current measuring range schematic diagram of secondary side bucking coil of different turn ratios in the prior art.

Fig. 3 is the current measuring range schematic diagram of the current measurement mechanism of the embodiment of the present invention 1.

Fig. 4 is the structural schematic diagram of the current measurement mechanism of the embodiment of the present invention 2.

Fig. 5 is the first structure diagram of the current measurement mechanism in the device for measurement of electrical energy of the embodiment of the present invention 3.

Fig. 6 is the module diagram of the device for measurement of electrical energy of the embodiment of the present invention 3.

Fig. 7 is the second structural schematic diagram of the current measurement mechanism in the device for measurement of electrical energy of the embodiment of the present invention 3.

Fig. 8 is the structural schematic diagram of the current measurement mechanism in the device for measurement of electrical energy of the embodiment of the present invention 4.

Fig. 9 is the module diagram of the device for measurement of electrical energy of the embodiment of the present invention 4.

Specific embodiment

The embodiment for further illustrating the present invention below by the mode of embodiment, but therefore not limiting the present invention to Among range.