CN106291049A - Current detection circuit based on two-way saturation current sensor and driving method thereof - Google Patents
Current detection circuit based on two-way saturation current sensor and driving method thereof Download PDFInfo
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- CN106291049A CN106291049A CN201610616115.2A CN201610616115A CN106291049A CN 106291049 A CN106291049 A CN 106291049A CN 201610616115 A CN201610616115 A CN 201610616115A CN 106291049 A CN106291049 A CN 106291049A
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- current
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- power device
- current sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
Abstract
The present invention discloses a kind of current detection circuit based on two-way saturation current sensor and driving method thereof, this testing circuit is made up of magnet ring type current sensor, H bridge current detection circuit and brachium pontis power device drive circuit, uses current sensor to realize high temperature resistant ability to work and isolation features；Use H bridge current detection circuit to make current sensor secondary two-way saturated, compensate for the impact on current detecting of the positive and negative remanent magnetism, and eliminate the positive and negative remanent magnetism error with temperature drift；Comparator and d type flip flop is used to realize quickly response.Compared with existing current detection circuit, high temperature resistant ability to work can be met simultaneously, there is isolation features, the quickly requirement such as response and high accuracy, be suitably applied heat resisting motor driver current based on SiC MOSFET detection.
Description
Technical field
The present invention relates to a kind of high temperature resistant current detection circuit, especially relate to a kind of based on two-way saturation current sensor
High temperature resistant current detection circuit.Belong to field of power electronics.
Background technology
In the control strategy of motor driver, the switching frequency of power device is directed to detect electric current.Therefore, Si
Base changer uses the electric current detecting method such as Hall element, divertor such as to realize current detecting.
Along with developing rapidly of novel SiC device, motor driver based on SiC device can be widely applied for the most
The high temperature applicationss such as electricity aircraft, electric automobile and oil drilling, the operating ambient temperature of these occasions is more than 200 DEG C.But, limited
In temperature, electric current detecting method based on Si changer is difficult to be applicable to SiC based high-temp-resistant changer.Luo-coil, Hall pass
The current detecting mode such as sensor and divertor is applied limitation in high temperature shift device current detecting, uses magnet ring to make
Possess high temperature operation capability for current sensor, and possess isolation and detection AC/DC function.High temperature current detecting is present stage
One of key issue that can SiC based high-temp-resistant changer realize, causes the attention of research worker.
Existing current detecting generally uses divertor to realize current detecting, and the loss of divertor testing circuit all adds
On resistance, it is lost bigger；And failing to realize isolation features, high-voltage signal is prone to seal in low-voltage chip and causes its damage, impact inspection
Slowdown monitoring circuit unfailing performance.Resistance used by divertor in wide temperature range temperature drift and fall volume phenomenon can not ignore, resistance and
Pressure grade the most substantially reduces, and affects the precision of current detecting.
Other documents give isolation electric current detecting method, propose to use Luo-coil sensor measurement converter switches pipe
Transient response.But, Luo-coil needs extra auxiliary circuit, and magnetic core is in when low-frequency range and measurement DC current
Saturation.Therefore, Luo-coil is only used for measuring alternating current, and practicality is the strongest.Sensor based on Hall effect and
Transformer based on magnetic resistance, magneto-optic effect is also one of method of current detecting, these sensors can measure DC current and
Alternating current.It is wider that frequency band measured by photoelectric sensor, but is limited to non-linear, and its electrical characteristic shows stronger temperature and depends on
Lai Xing, is not suitable for high temperature resistant changer.Hall effect sensor is to detect based on the Hall type device being positioned at magnetic core air gap
Direct current or the alternating component of tens kHz, but Hall element is difficult to tolerate 200 DEG C of high temperature above environment,
Concluding above electric current detecting method visible, the electric current detecting method of current Si base changer is all difficult to meet SiC base
The reliable high temperature operation capability of high temperature resistant changer, in high precision, low-loss, possess isolation and AC/DC power of test.The magnet ring system of employing
The current sensor become can meet the requirement of SiC based high-temp-resistant changer, and the coercivity of preferable magnetics is zero, but actual electricity
The remanent magnetism of flow sensor magnetic material and coercivity make detection electric current produce error, need to eliminate coercivity H to detection electric current
Impact.Additionally, magnetic material B～H curve drift about with temperature, make detection electric current temperature influence relatively big, therefore need inspection
Survey electric current and realize the compensation of temperature contrast.The saturated after current of magnetics gathers way and is exceedingly fast, and current error compensates circuit should be had
Standby supper-fast responding ability.Selection to magnetic material, its Curie temperature should be higher than that operating temperature, and has higher saturated magnetic
Flux density and pcrmeability.It is also contemplated that the temperature stabilization characteristic of the passive elements such as wide temperature range internal resistance.In sum, have
The magnet ring type current sensor compensating function meets the requirement of high temperature resistant converter current detection, it is possible to as high temperature resistant changer
Electric current detecting method.
Summary of the invention
It is contemplated that overcome the deficiencies in the prior art, it is provided that a kind of high temperature resistant electricity based on saturated directional current sensor
Current detection circuit and driving method thereof, the advantage of this current detection circuit is mainly reflected in possesses isolating power, hot operation energy
Power, high accuracy and capability of fast response.
The current detection circuit based on two-way saturation current sensor that the present invention provides, this current detection circuit includes magnetic
Ring type current sensor, H bridge current detection circuit and brachium pontis power device drive circuit；Described magnet ring type current sensor is former
While be the drain lead of SiC MOSFET to be measured in motor driver；Secondary is around being connected on magnet ring, with H bridge current detection circuit phase
Even；Described H bridge current detection circuit includes power supply VCC, power device T1、T2、T3And T4And current-limiting resistance Rs；Described
Brachium pontis power device drive circuit includes comparator and d type flip flop, it is achieved the switching of H bridge power device on off state.
Described H bridge current detection circuit is specifically, upper brachium pontis is power device T1、T3, lower brachium pontis is power device T2、T4；
Magnet ring type current sensor secondary is connected across between upper and lower brachium pontis midpoint, upper brachium pontis power device T1、T3It is connected across power supply respectively
Power supply VCCAnd between magnet ring type current sensor secondary, lower brachium pontis power device T2、T4It is connected across current-limiting resistance R respectivelysAnd electric current
Between sensor secondary, described current-limiting resistance RsIt is connected across earth terminal GND and lower brachium pontis power device T2、T4Between.
Described brachium pontis power device drive circuit is specifically, the outfan of described comparator connects the clock letter of d type flip flop
Number pin, described d type flip flop includes outfan Q and Q', and wherein, outfan Q connects the power device in H bridge current detection circuit
T1、T4Grid, outfan Q' connects the power device T in H bridge current detection circuit2、T3Grid；Described comparator is just
Input connects the source electrode of power device T2 Yu T4, negative input end ground connection.
The described magnet ring type current sensor former limit number of turn is 1, and the secondary number of turn is Ns.
Current detection circuit driving method based on two-way saturation current sensor, by sampling current-limiting resistance RsTwo ends
Voltage isRsCompared with the reference voltage of comparator, the Clock Signal pin of output to d type flip flop, when the clock of d type flip flop is believed
When number being rising edge, its output Q, Q' upset, thus realize the switching of H bridge power device on off state.
As power device T1、T4During conducting, after magnet ring type current sensor secondary current is gradually increased to forward saturation region,
Rapidly increase to maximum ismax, now comparator is output as rising edge, and H bridge switches to T2、T3Conducting, magnet ring type current sense
After device secondary current is gradually decrease to negative sense saturation region, it is quickly decreased to minima-ismax, now comparator output is upper again
Rising edge, H bridge switches to T1、T4Conducting, circulates according to this.
It is being switched on or off the limit gate drive voltage that the described SiC MOSFET to be measured of moment employing can bear, is leading
Use asymmetric raster data model resistance when leading to or turn off, antireflux diode will be used when described SiC MOSFET to be measured turns off
On state resistance R by H bridge current detection circuit brachium pontis conducting power deviceds(on)Short circuit, there is forward in magnet ring type current sensor
Coercivity HcAnd negative sense coercivity-Hc., under wide range of temperature, coercivity produces temperature drift, and its size is respectively Δ Hc
And-Δ Hc.The two-way saturated working method of magnet ring type current sensor secondary makes positive negative sense remanent magnetism and temperature drift thereof cancel each other.
The present invention uses above technical scheme compared with prior art, has following technical effect that
The present invention is to have the high temperature resistant ac/dc current detection circuit of isolation features, can solve following tripartite simultaneously
Face problem: (1) magnet ring type current sensor has the H-bridge circuit of isolation features (2) two-way operation and is capable of wide temperature range
Lower remanent magnetism and coercitive temperature-compensating (3) achieve over 250 DEG C of high temperature resistant abilities to work and ac/dc current detecting.
Accompanying drawing explanation
Below with reference to accompanying drawing, the invention will be further described:
Fig. 1 is the two-way saturation current sensor hysteresis curve of the magnet ring type in the present invention；
Fig. 2 is the secondary H bridge current detection circuit figure in the present invention；
Fig. 3 is the H bridge power device drive circuit figure in the present invention；
Fig. 4 is the H bridge current detection circuit operation mode figure in the present invention；
Fig. 5 is the H bridge current detection circuit operation mode figure in the present invention；
Fig. 6 is present invention current detection circuit figure based on two-way saturation current sensor；
Fig. 7 is the current sensor secondary current i in the present inventionsSequential chart；
In figure: VCC-high voltage power supply, GND-earth terminal, T1、T2、T3And T4The power of-H bridge current detection circuit upper and lower bridge arm
Device, L (is)-current sensor secondary inductance；
RS-current-limiting resistance, Rds(on)The on state resistance of conducting power device in-H bridge.
Detailed description of the invention
The embodiment of the present invention provides a kind of current detection circuit based on two-way saturation current sensor and driving method thereof,
For making those skilled in the art be more fully understood that technical scheme, below in conjunction with the accompanying drawings with detailed description of the invention to this
Bright it is described in further detail.It is exemplary by the embodiment being described with reference to the drawings, is not only used for explaining the present invention, and not
Limitation of the present invention can be construed to.
The present invention proposes and a kind of is applicable to the high accuracy of heat resisting motor driver, quick response current testing circuit,
The two-way saturation current sensor using magnet ring to make can meet the requirement of SiC based high-temp-resistant changer.Actual current sensor
The remanent magnetism of magnetic material and coercivity make detection electric current produce error, need the impact eliminating coercivity H to detection electric current.This
Outward, magnetic material B～H curve drift about with temperature, make detection electric current temperature influence relatively big, therefore it is two-way to make magnet ring be operated in
Saturation mode, makes hysteresis curve cancel each other with the drift of temperature, it is achieved the compensation of wide temperature range.Electricity after magnetics is saturated
Stream gathers way and is exceedingly fast, and current error compensates circuit should possess supper-fast responding ability.
As it is shown in figure 1, t1～the t3 moment, magnet ring forward conduction, and unsaturation, when t3 moment magnet ring is saturated, and Hs subtracts rapidly
Little, reach maximum negative value in the t4 moment；T5～the t7 moment, magnet ring reverse-conducting, and unsaturation, when t7 moment magnet ring is saturated,
Hs increases rapidly, reaches maximum negative value in the t8 moment.
Concrete, as shown in Figure 6, the current detection circuit based on two-way saturation current sensor that the present invention provides, bag
Include magnet ring type current sensor, H bridge current detection circuit and brachium pontis power device drive circuit；Described magnet ring type current sense
The former limit of device is the drain lead of SiC MOSFET to be measured in motor driver；Secondary is around being connected on magnet ring, with H bridge current detecting electricity
Road is connected；Described H bridge current detection circuit includes power supply VCC, power device T1、T2、T3And T4And current-limiting resistance Rs；Institute
The brachium pontis power device drive circuit stated includes comparator and d type flip flop, it is achieved the switching of H bridge power device on off state.
Wherein, as in figure 2 it is shown, described H bridge current detection circuit is specifically, upper brachium pontis is power device T1、T3, lower brachium pontis
For power device T2、T4；Magnet ring type current sensor secondary is connected across between upper and lower brachium pontis midpoint, upper brachium pontis power device T1、
T3It is connected across power supply V respectivelyCCAnd between magnet ring type current sensor secondary, lower brachium pontis power device T2、T4It is connected across respectively
Current-limiting resistance RsAnd between current sensor secondary, described current-limiting resistance RsIt is connected across earth terminal GND and lower brachium pontis power device
T2、T4Between.
As it is shown on figure 3, described brachium pontis power device drive circuit is specifically, the outfan of described comparator connects D triggering
The Clock Signal pin of device, described d type flip flop includes outfan Q and Q', and wherein, outfan Q connects in H bridge current detection circuit
Power device T1、T4Grid, outfan Q' connects the power device T in H bridge current detection circuit2、T3Grid；Described
The positive input terminal of comparator connects the source electrode of power device T2 Yu T4, negative input end ground connection.
The described magnet ring type current sensor former limit number of turn is 1, and the secondary number of turn is Ns.
Current detection circuit driving method based on two-way saturation current sensor, by sampling current-limiting resistance RsTwo ends
Voltage isRsCompared with the reference voltage of comparator, the Clock Signal pin of output to d type flip flop, when the clock of d type flip flop is believed
When number being rising edge, its output Q, Q' upset, thus realize the switching of H bridge power device on off state.
As shown in Figure 4,5, as power device T1、T4During conducting, magnet ring type current sensor secondary current is just gradually increased to
Behind saturation region, rapidly increase to maximum ismax, now comparator is output as rising edge, and H bridge switches to T2、T3Conducting, magnet ring
After formula current sensor secondary current is gradually decrease to negative sense saturation region, it is quickly decreased to minima-ismax, now comparator is defeated
Going out is rising edge again, and H bridge switches to T1、T4Conducting, circulates according to this.
It is being switched on or off the limit gate drive voltage that the described SiC MOSFET to be measured of moment employing can bear, is leading
Use asymmetric raster data model resistance when leading to or turn off, antireflux diode will be used when described SiC MOSFET to be measured turns off
On state resistance R by H bridge current detection circuit brachium pontis conducting power deviceds(on)Short circuit, there is forward in magnet ring type current sensor
Remanent magnetism HcAnd negative sense remanent magnetism-Hc., under wide range of temperature, remanent magnetism produces temperature drift, and its size is respectively Δ HcAnd-Δ
Hc.The two-way saturated working method of magnet ring type current sensor secondary makes positive negative sense remanent magnetism and temperature drift thereof cancel each other.
Embodiment
The operation principle of circuit of the present invention is: primary current ipWith former limit magnetic field intensity HpRelation be: Hp=(ip·Np)/
lm；H bridge power device T1、T4Secondary current i during conductings1、T2、T3Secondary current i during conductings2Strong with secondary magnetic field respectively
The relation of degree is: Δ Hs1=(is1·Ns)/lm、ΔHs2=(is2·Ns)/lm.Permissible from the hysteresis curve of current sensor secondary
Find out: Hp=(Δ H1+ΔH2)/2.Therefore limit, source to be measured electric current can be represented by two secondary currents: ip=Ns(is1+is2)/2Np。
From the hysteresis curve of current sensor secondary it can be seen that the remanent magnetism of its positive axis and negative semiaxis is respectively HcAnd-
Hc.When the temperature increases, the size of positive and negative remanent magnetism can occurrence temperature be drifted about, but the amplitude that forward remanent magnetism increases subtracts with negative sense remanent magnetism
Little amplitude, ao HcEssentially identical.If positive and negative remanent magnetism can be cancelled out each other, not only inhibit remanent magnetism temperature under wide temperature range
Degree drift phenomenon, also eliminates original remanent magnetism H in real transformercThe error that secondary current detection is produced.
If original state is T1、T4Conducting, after current sensor secondary is saturated, current sensor secondary is equivalent to short circuit,
Secondary current isAnd the voltage i on current-limiting resistancesRsTo increase sharply, as current-limiting resistance RsOn voltage isRsMore than reference voltage
urefTime, comparator output high level is to the clock signal of d type flip flop, and now output Q, Q' upset of d type flip flop is low electricity for Q
Flat, Q' is that high level switches to T2、T3Conducting.
If original state is T2, T3 conducting, after current sensor secondary is saturated, current sensor secondary is equivalent to short
Road, secondary current isAnd the voltage i on current-limiting resistancesRsTo increase sharply, as current-limiting resistance RsOn voltage isRsMore than benchmark
Voltage urefTime, comparator output high level is to the clock signal of d type flip flop, and now output Q, Q' upset of d type flip flop for Q is
High level, Q' is low level, switches to T1、T4Conducting.
As it is shown in fig. 7, t1～t3 moment, magnet ring forward conduction, and unsaturation, secondary current is slowly increased；When the t3 moment
Magnet ring is saturated, and Hs reduces rapidly, reaches maximum negative value in the t4 moment, and secondary current rapidly increases to maximum ismax；T5～
The t7 moment, magnet ring reverse-conducting, and unsaturation, secondary current slowly declines, when t7 moment magnet ring is saturated, and Hs increases rapidly,
The t8 moment reaches maximum negative value, and secondary current quickly falls to minima-ismax。
Above example is a concrete implementing circuit schematic diagram of the present invention, does not limit the guarantor of the present invention with this
Protect scope.Any equivalent transformation circuit done based on the present invention, belongs to scope.
Claims (7)
1. current detection circuit based on two-way saturation current sensor, is characterized in that, this current detection circuit includes magnet ring type
Current sensor, H bridge current detection circuit and brachium pontis power device drive circuit；The described former limit of magnet ring type current sensor is
The drain lead of SiC MOSFET to be measured in motor driver；Secondary, around being connected on magnet ring, is connected with H bridge current detection circuit；
Described H bridge current detection circuit includes power supply VCC, power device T1、T2、T3And T4And current-limiting resistance Rs；Described bridge
Arm power device drive circuit includes comparator and d type flip flop, it is achieved the switching of H bridge power device on off state.
Current detection circuit based on two-way saturation current sensor the most according to claim 1, is characterized in that, described H
Bridge current detection circuit is specifically, upper brachium pontis is power device T1、T3, lower brachium pontis is power device T2、T4；Magnet ring type electric current passes
Sensor secondary is connected across between upper and lower brachium pontis midpoint, upper brachium pontis power device T1、T3It is connected across power supply V respectivelyCCAnd magnet ring
Between formula current sensor secondary, lower brachium pontis power device T2、T4It is connected across current-limiting resistance R respectivelysAnd current sensor secondary it
Between, described current-limiting resistance RsIt is connected across earth terminal GND and lower brachium pontis power device T2、T4Between.
Current detection circuit based on two-way saturation current sensor the most according to claim 1, is characterized in that, described bridge
Arm power device drive circuit is specifically, the outfan of described comparator connects the Clock Signal pin of d type flip flop, and described D touches
Sending out device and include outfan Q and Q', wherein, outfan Q connects the power device T in H bridge current detection circuit1、T4Grid, defeated
Go out to hold Q' to connect the power device T in H bridge current detection circuit2、T3Grid；The positive input terminal of described comparator connects power
The source electrode of device T2 Yu T4, negative input end ground connection.
Current detection circuit based on two-way saturation current sensor the most according to claim 1, is characterized in that, described
The magnet ring type current sensor former limit number of turn is 1, and the secondary number of turn is Ns.
5. current detection circuit driving method based on two-way saturation current sensor, is characterized in that, by sampling current-limiting resistance Rs
The voltage i at two endssRsCompared with the reference voltage of comparator, the Clock Signal pin of output to d type flip flop, when d type flip flop
When clock signal is rising edge, its output Q, Q' upset, thus realize the switching of H bridge power device on off state.
Current detection circuit driving method based on two-way saturation current sensor the most according to claim 5, its feature
It is, as power device T1、T4During conducting, after magnet ring type current sensor secondary current is gradually increased to forward saturation region, increase rapidly
It is added to maximum ismax, now comparator is output as rising edge, and H bridge switches to power device T2、T3Conducting, magnet ring type electric current passes
After sensor secondary current is gradually decrease to negative sense saturation region, it is quickly decreased to minima-ismax, now comparator output is again
Rising edge, H bridge switches to power device T1、T4Conducting, circulates according to this.
Current detection circuit driving method based on two-way saturation current sensor the most according to claim 5, its feature
To use the limit gate drive voltage that can bear of described SiC MOSFET to be measured being switched on or off moment, in conducting or
Use asymmetric raster data model resistance during shutoff, antireflux diode will be used H when described SiC MOSFET to be measured turns off
The on state resistance R of bridge current detection circuit brachium pontis conducting power deviceds(on)Short circuit, there is forward and rectifys in magnet ring type current sensor
Stupid power HcAnd negative sense coercivity-Hc., under wide range of temperature, remanent magnetism produces temperature drift, and its size is respectively Δ HcAnd-
ΔHc., the two-way saturated working method of magnet ring type current sensor secondary makes positive negative sense remanent magnetism and temperature drift thereof cancel each other.
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| CN201610616115.2A CN106291049A (en) | 2016-07-29 | 2016-07-29 | Current detection circuit based on two-way saturation current sensor and driving method thereof |
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| CN110062891A (en) * | 2016-12-02 | 2019-07-26 | Cmr外科有限公司 | Sense motor current |
| CN114167125A (en) * | 2021-07-29 | 2022-03-11 | 沈阳工业大学 | Current detection circuit |
| CN115219764A (en) * | 2022-07-11 | 2022-10-21 | 上海钧嵌传感技术有限公司 | Pulse current protection circuit and method for current sensor and current sensor |
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| CN110062891A (en) * | 2016-12-02 | 2019-07-26 | Cmr外科有限公司 | Sense motor current |
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Application publication date: 20170104 |