CN102539869A - Current detecting device and method - Google Patents
Current detecting device and method Download PDFInfo
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- CN102539869A CN102539869A CN201210042104XA CN201210042104A CN102539869A CN 102539869 A CN102539869 A CN 102539869A CN 201210042104X A CN201210042104X A CN 201210042104XA CN 201210042104 A CN201210042104 A CN 201210042104A CN 102539869 A CN102539869 A CN 102539869A
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Abstract
The invention discloses a current detecting device and method, relating to the field of power electronics. According to the invention, the purpose that one manufactured board is used for detecting current values of different ranges is achieved; the kinds of the manufactured boards are reduced; and therefore, the cost of production, management and maintenance is reduced. The current detecting device comprises a current sensor, a first to an Nth loading units, a controller and an AD(Analog-to-Digital) detecting unit, wherein N is a natural number of 2 or more than 2; the controller is used for respectively controlling switching on or switching off of first to the Nth switching units when the value of detected current belongs to different detecting ranges so that the first to the Nth resistance units form loads adapting to the detecting ranges; the detecting ranges are divided according to the value of the detecting current; and the AD detecting unit is used for sampling the voltage of the loads formed by the first to the Nth resistance units to obtain a load voltage value and computing to obtain the value of current to be detected according to the load voltage value.
Description
Technical field
The present invention relates to field of power electronics, relate in particular to a kind of current sensing means and method.
Background technology
At present, in electric system, in order to realize accurate control, need the electric current of checkout equipment usually, obtain measured value, controller is according to the measured value adjustment correlation parameter of electric current then.In current detection scheme, adopt the method for resistance sampling to convert current signal to voltage signal usually, (Analog-to-Digital, AD) translation interface goes sampling, thereby obtains the measured value of electric current to pass to modulus then.Along with the development of product seriation, it is big that the current value range of detection constantly becomes, and prior art can only be processed plate through same and detects the electric current in a certain current value range, lacks effective detection means the electric current of different current value range is detected.
Summary of the invention
Embodiments of the invention provide a kind of current sensing means and method, realize that same is processed the current value that plate detects different range, reduced the kind of processing plate, thereby have reduced the cost of production, management, maintenance.
For solving the problems of the technologies described above, embodiments of the invention adopt following technical scheme:
A kind of current sensing means comprises:
Current sensor is used for the electric current to be measured with the former limit of said current sensor, acts on the detection electric current of inducting on the secondary coil of said current sensor through mutual inductance;
First to the N load unit, and N is 2 or above natural number, wherein; The two ends of first load unit are electrically connected with the two ends of the secondary coil of said current sensor respectively, and the two ends of N load unit subsequently are connected in parallel on the two ends of N-1 load unit respectively, wherein; Said first load unit comprises: first resistance unit, or, first resistance unit and first switch element of connecting with said first resistance unit; Said first resistance unit is as pull-up resistor; Said first switch element is used to make said first load unit conducting or the shutoff, and said N load unit comprises: N resistance unit and the N switch element of connecting with said N resistance unit; Said N resistance unit is as pull-up resistor, and said N switch element is used to make conducting of said N load unit or shutoff;
Controller; Be used for when the value of said detection electric current belongs to the different detection scope; Control first the closed or disconnection respectively to the N switch element; So that said first form the load that adapts with said sensing range to the N resistance unit, said sensing range is divided according to the size of the value of said detection electric current;
Modulus AD detecting unit is used for the voltage of said first load that form to the N resistance unit is sampled, and obtains the load voltage value, and calculates the value of said electric current to be measured according to said load voltage value.
A kind of current sensing means comprises:
Current sensor is used for the electric current to be measured with the former limit of said current sensor, acts on the detection electric current of inducting between first end and second end of secondary coil of said current sensor through mutual inductance;
First to the N resistance unit; N is 2 or above natural number; Wherein, first end of said first resistance unit is electrically connected on first end of the secondary coil of said current sensor, and said first resistance unit is as pull-up resistor; First end of N resistance unit subsequently is electrically connected on second end of said N-1 resistance unit, and said N resistance unit is as pull-up resistor;
First to the N switch element; N is 2 or above natural number; Wherein, The two ends of said first switch element are electrically connected on second end of secondary coil of second end and the said current sensor of said first resistance unit respectively; Said first switch element is used to make conducting or shutoff between second end of secondary coil of second end and said current sensor of said first resistance unit; The two ends of N switch element subsequently are electrically connected on second end of secondary coil of second end and the said current sensor of said N resistance unit respectively, and said N switch element is used to make conducting or shutoff between second end of secondary coil of second end and said current sensor of said N resistance unit;
Controller; Be used for when the value of said detection electric current belongs to the different detection scope; Control first the closed or disconnection respectively to the N switch element; So that said first form the load that adapts with said sensing range to the N resistance unit, said sensing range is divided according to the size of the value of said detection electric current;
Modulus AD detecting unit is used for the voltage of said first load that form to the N resistance unit is sampled, and obtains the load voltage value, and calculates the value of said electric current to be measured according to said load voltage value.
A kind of electric current detecting method comprises:
With the electric current to be measured on the former limit of current sensor, act on the detection electric current of inducting on the secondary coil of said current sensor through mutual inductance;
Control first respectively to the closed of N switch element or break off, so that first to the N resistance unit forms and the different sensing ranges of said detection electric current adapt load;
Voltage to said load is sampled, and obtains the load voltage value, and calculates the value of said electric current to be measured according to said load voltage value.
Current sensing means that the embodiment of the invention provides and method; When detecting the electric current to be measured of different current value range; Control the closed or disconnection of different switch elements,, realized the change of pull-up resistor value according to the different resistance units or the various combination of a plurality of resistance units.Therefore realized that same is processed the current value that plate detects different range, reduced the kind of processing plate, thereby reduced the cost of production, management, maintenance.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the synoptic diagram of a kind of current sensing means in the embodiment of the invention;
Fig. 2 is the synoptic diagram of another kind of current sensing means in the embodiment of the invention;
Fig. 3 is the parallelly connected synoptic diagram as switch element with NMOSFET of PMOSFET among Fig. 1;
Fig. 4 is the parallelly connected synoptic diagram as switch element with NMOSFET of PMOSFET among Fig. 2;
Fig. 5 be among Fig. 1 PMOSFET or NMOSFET as the synoptic diagram of switch element;
Fig. 6 be among Fig. 2 PMOSFET or NMOSFET as the synoptic diagram of switch element;
Fig. 7 is the synoptic diagram of another kind of current sensing means in the embodiment of the invention;
Fig. 8 is the parallelly connected synoptic diagram as switch element with NMOSFET of PMOSFET among Fig. 7;
Fig. 9 be among Fig. 7 PMOSFET or NMOSFET as the synoptic diagram of switch element;
Figure 10 is the process flow diagram of a kind of electric current detecting method in the embodiment of the invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
The embodiment of the invention provides a kind of current sensing means, and is as shown in Figure 1, comprising: current sensor 1, be used for electric current to be measured with the former limit of current sensor, and act on the detection electric current of inducting on the secondary coil of current sensor through mutual inductance; First to N load unit L1, L2 ..., LN, N is 2 or above natural number, wherein; The two ends of the first load unit L1 are electrically connected with the two ends of the secondary coil of current sensor 1 respectively, and the two ends of the second load unit L2 subsequently are connected in parallel on the two ends of the first load unit L1 respectively, by that analogy; The two ends of N load unit LN are connected in parallel on the two ends of N-1 load unit L (N-1) respectively, and wherein, the first load unit L1 comprises: the first resistance unit R1; The first resistance unit R1 is as pull-up resistor; The second load unit L2 subsequently comprises: the second resistance unit R2 and second switch cell S 2, the second resistance unit R2 that connect with the second resistance unit R2 are used as pull-up resistor; Second switch cell S 2 is used to make second load unit L2 conducting or the shutoff; By that analogy, N load unit LN comprises: N resistance unit RN and the N switch element SN that connects with N resistance unit RN; N resistance unit RN is as pull-up resistor, and N switch element SN is used to make LN conducting of N load unit or shutoff; Controller 2; Be used for when the value that detects electric current belongs to the different detection scope; Control second to N switch element S2 respectively, S3 ..., SN closed or break off; So that first to N resistance unit R1, R2 ..., load that RN forms to adapt with above-mentioned sensing range, above-mentioned sensing range is divided according to the size of the value that detects electric current; Modulus AD detecting unit 3, be used for first to N resistance unit R1, R2 ..., the voltage of the load that forms of RN samples, obtain the load voltage value, and calculate the value of electric current to be measured according to the load voltage value.Wherein, first to N resistance unit R1, R2 ..., arbitrary resistance unit is that a resistance, the series connection of a plurality of resistance, the parallel connection of a plurality of resistance or a plurality of resistance string compose in parallel among the RN.
Below be the current sensing means that example further specifies the embodiment of the invention with concrete current detecting process: the electric current to be measured on current sensor 1 former limit acts on the detection electric current of inducting on the secondary coil of current sensor 1 through mutual inductance; For the different sensing range I1 of the N kind that detects electric current, I2 ..., IN; N is 2 or above natural number; When the value that detects electric current belongs to the first sensing range I1, controller 2 through second to N switch element S2, S3 ..., second load unit to the N load unit L2 of SN control except that the first load unit L1, L3 ..., LN turn-offs, the branch road that has only the first resistance unit R1 of tandem tap unit not to belong to; The i.e. first load unit L1 conducting; Therefore the first resistance unit R1 is as first pull-up resistor, and first pull-up resistor value size adapts with the first sensing range I1, divides the first sensing range I1 according to the size that detects current value; The detection electric current of inducting on the secondary coil of current sensor 1 flows through the first resistance unit R1; And on the first resistance unit R1, produce load voltage; 3 pairs of load voltages of AD detecting unit are sampled, and obtain the load voltage value, and calculate the value of electric current to be measured according to the load voltage value; When the value that detects electric current belongs to the second sensing range I2; Controller 2 through second to N switch element S2, S3 ..., SN control the 3rd load unit to the N load unit L3 ..., LN turn-offs; The second load unit L2 conducting; Therefore the first resistance unit R1 and the second resistance unit R2 parallel connection are as second pull-up resistor, and the size of the second pull-up resistor value and the second sensing range I2 adapt, and divide the second sensing range I2 according to the size that detects current value; Induct on the secondary coil of current sensor 1 and detect the first resistance unit R1 and the second resistance unit R2 that electric current flows through parallel connection; And on the first resistance unit R1 of parallel connection and the second resistance unit R2, produce load voltage; 3 pairs of load voltages of AD detecting unit are sampled; Obtain the load voltage value, and calculate the value of electric current to be measured according to the load voltage value; When the value that detects electric current belongs to the 3rd sensing range I3; Controller 2 through second to N switch element S2, S3 ..., SN controls the 3rd load unit L3 conducting; Other load units turn-off; Therefore the first resistance unit R1 and the 3rd resistance unit R3 parallel connection are as the 3rd pull-up resistor, and the size of the 3rd pull-up resistor value and the 3rd sensing range I3 adapt, and divide the 3rd sensing range I3 according to the size that detects current value; Induct on the secondary coil of current sensor 1 and detect the first resistance unit R1 and the 3rd resistance unit R3 that electric current flows through parallel connection; And on the first resistance unit R1 of parallel connection and the 3rd resistance unit R3, produce load voltage; 3 pairs of load voltages of AD detecting unit are sampled; Obtain the load voltage value, and calculate the value of electric current to be measured according to the load voltage value; By that analogy; When the value that detects electric current belongs to N sensing range IN; Controller 2 through second to N switch element S2, S3 ..., SN control two to N-1 load unit L2, L3 ..., L (N-1) turn-offs; Have only the first load unit L1 and N load unit LN conducting; Therefore the first resistance unit R1 and N resistance unit RN parallel connection are as the N pull-up resistor, and the size and the N sensing range IN of N pull-up resistor value adapt, and divide N sensing range IN according to the size that detects current value; Induct on the secondary coil of current sensor 1 and detect the first resistance unit R1 and the N resistance unit RN that electric current flows through parallel connection; And on the first resistance unit R1 of parallel connection and N resistance unit RN, produce load voltage; 3 pairs of load voltages of AD detecting unit are sampled; Obtain the load voltage value, and calculate the value of electric current to be measured according to the load voltage value.
For the different sensing ranges that detect electric current,, can also other form the mode of different pull-up resistors except the mode of the different pull-up resistor of above-mentioned composition.For example, when the value of detection electric current belonged to the first sensing range I1, the first resistance unit R1 was as first pull-up resistor; When the value of detection electric current belonged to the second sensing range I2, the first resistance unit R1 and the second resistance unit R2 parallel connection were as second pull-up resistor; By that analogy, when the value that detects electric current belongs to N sensing range IN, first to N resistance unit R1, R2 ..., the RN parallel connection is as the N pull-up resistor.Thereby realize that first forms the load that adapts with the different sensing ranges of detection electric current to the N resistance unit, and the voltage of above-mentioned load is sampled, obtain the load voltage value, and calculate the value of electric current to be measured according to the load voltage value.
Need to prove; Whether the size of pull-up resistor value adapts with sensing range is that load voltage value scope, the power bracket of pull-up resistor and the loading range of current sensor 1 according to AD detecting unit 3 can be sampled comprehensively judged, and divides sensing range thus.
As shown in Figure 2, above-mentioned current sensing means can also be following structure, and particularly, the first load unit L1 comprises the first resistance unit R1 and the first switch element S1 that connects with the said first resistance unit R1; The first switch element S1 is used to make first load unit L1 conducting or the shutoff, and controller 2 is electrically connected on the first switch element S1, is used for controlling through the first switch element S1 conducting or the shutoff of the first load unit L1; Other structures are same as the previously described embodiments, repeat no more at this.Concrete current detecting process is similar to the above embodiments; According to the different sensing ranges that detect electric current; Controller 4 controls first to N switch element S1 respectively, S2 ..., SN closed or break off; Make any resistance unit or conduct of a plurality of resistance unit parallel resistor value and the pull-up resistor value that sensing range adapts, the mode of specifically forming different pull-up resistors can be same as the previously described embodiments, and perhaps other form the mode of different pull-up resistors.For example, when the value of detection electric current belonged to the first sensing range I1, the first resistance unit R1 was as first pull-up resistor; When the value of detection electric current belonged to the second sensing range I2, the second resistance unit R2 was as second pull-up resistor; By that analogy, when the value of detection electric current belonged to N sensing range IN, N resistance unit RN was as the N pull-up resistor.Again for example, when the value of detection electric current belonged to the first sensing range I1, the first resistance unit R1 and the second resistance unit R2 parallel connection were as first pull-up resistor; When the value of detection electric current belonged to the second sensing range I2, the second resistance unit R2 and the 3rd resistance unit R3 parallel connection were as second pull-up resistor; By that analogy, when the value of detection electric current belonged to N-1 sensing range I (N-1), N-1 resistance unit R (N-1) and N resistance unit RN parallel connection were as the N-1 pull-up resistor; When the value of detection electric current belonged to N sensing range IN, the N resistance unit RN and the first resistance unit R1 parallel connection were as the N pull-up resistor.So that first to N resistance unit R1, R2 ..., load that RN forms to adapt with above-mentioned sensing range; 3 pairs of above-mentioned load voltages of modulus AD detecting unit are sampled afterwards; Obtain the load voltage value, and calculate the value of said electric current to be measured according to the load voltage value.
Because it is different to detect the current value range of electric current; When detecting the electric current to be measured of different current value range; Control the closed or disconnection of different switch elements,, realized the change of pull-up resistor value according to the different resistance units or the various combination of a plurality of resistance units.Therefore the current sensing means that provides of the embodiment of the invention is promptly processed plate, has realized that same is processed the current value that plate detects different range, reduced the kind of processing plate, thereby has reduced the cost of production, management, maintenance.
Particularly; Like Fig. 3 and shown in Figure 4; Above-mentioned switch element is by metal oxide layer semiconductor field effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor; MOSFET) on-off circuit of forming, alternatively, each switch element is the circuit that PMOSFET connects with NMOSFET; Wherein, the parasitic diode D2 of the parasitic diode D1 of PMOSFET and NMOSFET is in the opposite direction.As shown in Figure 3; Second to N switch element S2, S3 ..., SN is the circuit that PMOSFET connects with NMOSFET, promptly with second to N resistance unit R2, R3 ..., a PMOSFET of series connection and a NMOSFET on each resistance unit place branch road among the RN, wherein; The drain electrode of PMOSFET connects resistance unit; The source electrode of PMOSFET connects the source electrode of NMOSFET, and the drain electrode of NMOSFET is as an end of the secondary coil of the end connection current sensor of load unit, and the anode of parasitic diode D1 is connected in the drain electrode of PMOSFET; The negative electrode of parasitic diode D1 is connected in the source electrode of PMOSFET; The anode of parasitic diode D2 is connected in the drain electrode of NMOSFET, and the negative electrode of parasitic diode D2 is connected in the source electrode of NMOSFET, and promptly the parasitic diode D2 of the parasitic diode D1 of PMOSFET and NMOSFET is in the opposite direction; Controller 2 is connected in the grid of PMOSFET and NMOSFET, is used to control conducting or the shutoff of PMOSFET and NMOSFET.Likewise, as shown in Figure 4, in the circuit that comprises the first switch element S1, the first switch element S1 and above-mentioned second to N switch element S2, S3 ..., the structure of arbitrary switch element is identical among the SN, repeat no more at this.The process that detects electric current is same as the previously described embodiments, repeats no more at this.Because two parasitic diode D1 are in the opposite direction with D2's, therefore when PMOSFET and NMOSFET turn-offed, the electric current on the both direction all can't pass through, so can realize alternating current and galvanic detection.Need to prove; Fig. 3 and Fig. 4 are the synoptic diagram of current sensing means in the embodiment of the invention; PMOSFET and NMOSFET are not limited to the side at resistance unit; Can also PMOSFET and NMOSFET lay respectively at resistance unit both sides that a resistance forms or when resistance unit be that a plurality of resistance are when being composed in series; PMOSFET and NMOSFET are between above-mentioned a plurality of resistance or other structures, as long as PMOSFET is connected on conducting or the shutoff that can control above-mentioned branch road in each resistance unit place branch road with NMOSFET.
Alternatively, each switch element is NMOSFET or PMOSFET.Particularly; As shown in Figure 5, second to each load unit of N load unit, with each resistance unit R2, R3 ..., RN connect respectively a NMOSFET or PMOSFET; As shown in Figure 6; First to each load unit of N load unit, with each resistance unit R1, R2, R3 ..., RN connect respectively a NMOSFET or PMOSFET, controller 2 is connected in the grid of NMOSFET or PMOSFET; Be used to control conducting or the shutoff of NMOSFET or PMOSFET, to realize the conducting and the shutoff of load unit.The process that detects electric current is same as the previously described embodiments, repeats no more at this.Owing to contain parasitic diode among the MOSFET, when NMOSFET or PMOSFET shutoff, can only block an electric current on the direction, and the electric current on another direction can pass through parasitic diode, therefore can only detect direct current.The current detecting process is same as the previously described embodiments particularly, repeats no more at this.
Because it is different to detect the current value range of electric current; When detecting the electric current to be measured of different current value range; Control the closed or disconnection of different switch elements,, realized the change of pull-up resistor value according to the different resistance units or the various combination of a plurality of resistance units.Therefore the current sensing means that provides of the embodiment of the invention is promptly processed plate, has realized that same is processed the current value that plate detects different range, reduced the kind of processing plate, thereby has reduced the cost of production, management, maintenance.
As shown in Figure 7; The embodiment of the invention also provides a kind of current sensing means; Comprise: current sensor 1, be used for electric current to be measured with the former limit of current sensor, act on the detection electric current of inducting between the first end 1a and the second end 1b of secondary coil of current sensor through mutual inductance; First to N resistance unit R1, R2 ..., RN; N is 2 or above natural number, and wherein, first end of the first resistance unit R1 is electrically connected on the first end 1a of the secondary coil of said current sensor; The first resistance unit R1 is as pull-up resistor; First end of the second resistance unit R2 subsequently is electrically connected on second end of the first resistance unit R1, and the second resistance unit R2 is as pull-up resistor, by that analogy; First end of N resistance unit RN subsequently is electrically connected on second end of N-1 resistance unit R (N-1), and N resistance unit RN is as pull-up resistor; First to N switch element S1, S2 ..., SN; N is 2 or above natural number; Wherein, The two ends of the first switch element S1 are electrically connected on the second end 1b of secondary coil of second end and the current sensor of the first resistance unit R1 respectively; The first switch element S1 is used to make conducting or shutoff between the second end 1b of secondary coil of second end and current sensor of the first resistance unit R1; The two ends of second switch unit R 2 subsequently are electrically connected on the second end 1b of secondary coil of second end and the current sensor of the second resistance unit R2 respectively; Second switch unit R 2 is used to make conducting or shutoff between the second end 1b of secondary coil of second end and current sensor of the second resistance unit R2; By that analogy, the two ends of N switch element SN subsequently are electrically connected on the second end 1b of secondary coil of second end and the current sensor of N resistance unit RN respectively, and N switch element SN is used to make conducting or shutoff between the second end 1b of secondary coil of second end and current sensor of said N resistance unit RN; Controller 2; Be used for when the value that detects electric current belongs to the different detection scope; Control first to N switch element S1 respectively, S2 ..., SN closed or break off; So that first to N resistance unit R1, R2 ..., load that RN forms to adapt with above-mentioned sensing range, sensing range is divided according to the size of the value that detects electric current; Modulus AD detecting unit 3, be used for first to N resistance unit R1, R2 ..., the voltage of the load that forms of RN samples, obtain the load voltage value, and calculate the value of electric current to be measured according to the load voltage value.Need to prove, above-mentioned first to N resistance unit R1, R2 ..., arbitrary resistance unit is that a resistance, the series connection of a plurality of resistance, the parallel connection of a plurality of resistance or a plurality of resistance string compose in parallel among the RN.
Below be the current sensing means that example further specifies the embodiment of the invention with concrete current detecting process: the electric current to be measured on current sensor 1 former limit acts on the detection electric current of inducting between the first end 1a and the second end 1b of secondary coil of current sensor 1 through mutual inductance; When the value that detects electric current belongs to the first sensing range I1; The first switch element S1 is closed in controller 2 controls, and other switch elements break off, at this moment; Has only the first resistance unit R1 conducting; The first resistance unit R1 is as first pull-up resistor, and the resistance of first resistance unit R1 size adapts with the first sensing range I1, divides the first sensing range I1 according to the size that detects current value; The detection electric current of inducting between the first end 1a of the secondary coil of current sensor 1 and the second end 1b flows through the first resistance unit R1; And on the first resistance unit R1, produce load voltage; 3 pairs of load voltages of AD detecting unit are sampled; Obtain the load voltage value, and calculate the value of electric current to be measured according to the load voltage value; When the value that detects electric current belongs to the second sensing range I2; Controller 2 control second switch cell S 2 closures, other switch elements break off, at this moment; Has only the first resistance unit R1 conducting of connecting with the second resistance unit R2; The first resistance unit R1 connects as second pull-up resistor with the second resistance unit R2, and the size of the second pull-up resistor value and the second sensing range I2 adapt, and divides the second sensing range I2 according to the size that detects current value; Induct between the first end 1a of the secondary coil of current sensor 1 and the second end 1b and detect the first resistance unit R1 and the second resistance unit R2 that electric current flows through parallel connection; And on the first resistance unit R1 of parallel connection and the second resistance unit R2, produce load voltage; 3 pairs of load voltages of AD detecting unit are sampled; Obtain the load voltage value, and calculate the value of electric current to be measured according to the load voltage value; By that analogy, when the value that detects electric current belonged to N sensing range IN, 2 control N switch element SN were closed for controller; Other switch elements break off; At this moment, first to N resistance unit R1, R2 ..., the RN conducting of all connecting, first to N resistance unit R1, R2 ..., RN connects as the N pull-up resistor; The size and the N sensing range IN of N pull-up resistor value adapt, and divide N sensing range IN according to the size that detects current value; Induct between the first end 1a of the secondary coil of current sensor 1 and the second end 1b detect electric current flow through series connection first to N resistance unit R1, R2 ..., RN; And the series connection first to N resistance unit R1, R2 ..., the last generation of RN load voltage; 3 pairs of load voltages of AD detecting unit are sampled; Obtain the load voltage value, and calculate the value of electric current to be measured according to the load voltage value.So just realized through controller 2 control first to N switch element S1 respectively, S2 ..., SN closed or break off; Thereby realize first to N resistance unit R1, R2 ..., load that RN forms to adapt with the different sensing ranges of detection electric current; And the voltage of above-mentioned load sampled; Obtain the load voltage value, and calculate the value of electric current to be measured according to the load voltage value.
Because it is different to detect the current value range of electric current; When detecting the electric current to be measured of different current value range; Control the closed or disconnection of different switch elements,, realized the change of pull-up resistor value according to the different resistance units or the various combination of a plurality of resistance units.Therefore the current sensing means that provides of the embodiment of the invention is promptly processed plate, has realized that same is processed the current value that plate detects different range, reduced the kind of processing plate, thereby has reduced the cost of production, management, maintenance.
Particularly, above-mentioned first to N switch element S1, S2 ..., SN is the on-off circuit of being made up of MOSFET, and is as shown in Figure 8, first to N switch element S1, S2 ..., each switch element can be connected with NMOSFET for PMOSFET among the SN circuit; Wherein, the parasitic diode D2 of the parasitic diode D1 of PMOSFET and NMOSFET is in the opposite direction; Controller 4 is connected in the grid of PMOSFET and NMOSFET, is used to control unlatching or the shutoff of PMOSFET and NMOSFET.Particularly; In the first switch element S1; The drain electrode of PMOSFET is electrically connected on second end of the first resistance unit R1 as the end of the first switch element S1; The source electrode of PMOSFET connects the source electrode of NMOSFET, and the drain electrode of NMOSFET is electrically connected on the second end 1b of the secondary coil of current sensor as the other end of the first switch element S1, controls conducting or the shutoff of PMOSFET and NMOSFET simultaneously through controller 4; Likewise; In second switch cell S 2; The drain electrode of PMOSFET is electrically connected on second end of the second resistance unit R2 as an end of second switch cell S 2; The source electrode of PMOSFET connects the source electrode of NMOSFET, and the drain electrode of NMOSFET is electrically connected on the second end 1b of the secondary coil of current sensor as the other end of second switch cell S 1; The rest may be inferred; In N switch element SN; The drain electrode of PMOSFET is electrically connected on second end of N resistance unit RN as the end of N switch element SN, and the source electrode of PMOSFET connects the source electrode of NMOSFET, and the drain electrode of NMOSFET is electrically connected on the second end 1b of the secondary coil of current sensor as the other end of N switch element SN; In each switch element; The anode of parasitic diode D1 is connected in the drain electrode of PMOSFET, and the negative electrode of parasitic diode D1 is connected in the source electrode of PMOSFET, and the anode of parasitic diode D2 is connected in the drain electrode of NMOSFET; The negative electrode of parasitic diode D2 is connected in the source electrode of NMOSFET, and promptly the parasitic diode D2 of the parasitic diode D1 of PMOSFET and NMOSFET is in the opposite direction.The process that detects electric current is same as the previously described embodiments, repeats no more at this.Because two parasitic diode D1 are in the opposite direction with D2's, therefore in same switch element, when PMOSFET and NMOSFET turn-offed, the electric current on the both direction all can't pass through, so can realize alternating current and galvanic detection.
As shown in Figure 9; First to N switch element S1, S2 ..., each switch element can be NMOSFET or PMOSFET among the SN; Controller 2 is connected in the grid of NMOSFET or PMOSFET, is used to control conducting or the shutoff of NMOSFET or PMOSFET, particularly; With the switch element is that NMOSFET is an example; In the first switch element S1, the source electrode of NMOSFET is electrically connected on second end of the first resistance unit R1 as the end of the first switch element S1, and the drain electrode of NMOSFET is electrically connected on the second end 1b of the secondary coil of current sensor as the other end of the first switch element S1; The rest may be inferred; Among the N switch element SN; The source electrode of NMOSFET is electrically connected on second end of N resistance unit RN as the end of N switch element SN, and the drain electrode of NMOSFET is electrically connected on the second end 1b of the secondary coil of current sensor as the other end of N switch element SN.Through conducting or the shutoff of controller 4 control MOSFET, realized first to N switch element S1, S2 ..., SN closed or break off.The process that detects electric current is same as the previously described embodiments, repeats no more at this, because therefore the restriction of stray capacitance among the MOSFET can only realize galvanic detection.
Because it is different to detect the current value range of electric current, when detecting the electric current to be measured of different current value range, control the closed or disconnection of different switch elements, according to the various combination of a plurality of resistance units, realized the change of pull-up resistor value.Therefore the current sensing means that provides of the embodiment of the invention is promptly processed plate, has realized that same is processed the current value that plate detects different range, reduced the kind of processing plate, thereby has reduced the cost of production, management, maintenance.
Shown in figure 10, invention is that embodiment also provides a kind of electric current detecting method, comprising:
Step 101, with the electric current to be measured on the former limit of current sensor, act on the detection electric current of inducting on the secondary coil of said current sensor through mutual inductance;
Step 102, control first to the closed of N switch element or break off respectively, so that first to the N resistance unit forms and the different sensing ranges of said detection electric current adapt load;
Step 103, the voltage of said load is sampled, obtain the load voltage value, and calculate the value of said electric current to be measured according to said load voltage value.
Concrete detection method and principle are same as the previously described embodiments, repeat no more at this.
Because it is different to detect the current value range of electric current; When detecting the electric current to be measured of different current value range; Control the closed or disconnection of different switch elements,, realized the change of pull-up resistor value according to the different resistance units or the various combination of a plurality of resistance units.Therefore the electric current detecting method that provides of the embodiment of the invention has realized that same is processed the current value that plate detects different range, reduced the kind of processing plate, thereby has reduced the cost of production, management, maintenance.
Through the description of above embodiment, the those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential common hardware, can certainly pass through hardware, but the former is better embodiment under a lot of situation.Based on such understanding; The part that technical scheme of the present invention contributes to prior art in essence in other words can be come out with the embodied of software product, and this computer software product is stored in the storage medium that can read, like the floppy disk of computing machine; Hard disk or CD etc.; Comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
The above; Be merely embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; Can expect easily changing or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of said claim.
Claims (7)
1. a current sensing means is characterized in that, comprising:
Current sensor is used for the electric current to be measured with the former limit of said current sensor, acts on the detection electric current of inducting on the secondary coil of said current sensor through mutual inductance;
First to the N load unit, and N is 2 or above natural number, wherein; The two ends of first load unit are electrically connected with the two ends of the secondary coil of said current sensor respectively, and the two ends of N load unit subsequently are connected in parallel on the two ends of N-1 load unit respectively, wherein; Said first load unit comprises: first resistance unit, or, first resistance unit and first switch element of connecting with said first resistance unit; Said first resistance unit is as pull-up resistor; Said first switch element is used to make said first load unit conducting or the shutoff, and said N load unit comprises: N resistance unit and the N switch element of connecting with said N resistance unit; Said N resistance unit is as pull-up resistor, and said N switch element is used to make conducting of said N load unit or shutoff;
Controller; Be used for when the value of said detection electric current belongs to the different detection scope; Control first the closed or disconnection respectively to the N switch element; So that said first form the load that adapts with said sensing range to the N resistance unit, said sensing range is divided according to the size of the value of said detection electric current;
Modulus AD detecting unit is used for the voltage of said first load that form to the N resistance unit is sampled, and obtains the load voltage value, and calculates the value of said electric current to be measured according to said load voltage value.
2. current sensing means according to claim 1 is characterized in that,
Said first to the N switch element arbitrary switch element comprise: NMOSFET, or PMOSFET, or have the PMOSFET and the NMOSFET of reverse direction parasitic diode and series connection each other.
3. current sensing means according to claim 2 is characterized in that,
Said controller is connected in the grid of said PMOSFET and/or said NMOSFET, with conducting or the shutoff of controlling said PMOSFET and/or said NMOSFET.
4. a current sensing means is characterized in that, comprising:
Current sensor is used for the electric current to be measured with the former limit of said current sensor, acts on the detection electric current of inducting between first end and second end of secondary coil of said current sensor through mutual inductance;
First to the N resistance unit; N is 2 or above natural number; Wherein, first end of said first resistance unit is electrically connected on first end of the secondary coil of said current sensor, and said first resistance unit is as pull-up resistor; First end of N resistance unit subsequently is electrically connected on second end of said N-1 resistance unit, and said N resistance unit is as pull-up resistor;
First to the N switch element; N is 2 or above natural number; Wherein, The two ends of said first switch element are electrically connected on second end of secondary coil of second end and the said current sensor of said first resistance unit respectively; Said first switch element is used to make conducting or shutoff between second end of secondary coil of second end and said current sensor of said first resistance unit; The two ends of N switch element subsequently are electrically connected on second end of secondary coil of second end and the said current sensor of said N resistance unit respectively, and said N switch element is used to make conducting or shutoff between second end of secondary coil of second end and said current sensor of said N resistance unit;
Controller; Be used for when the value of said detection electric current belongs to the different detection scope; Control first the closed or disconnection respectively to the N switch element; So that said first form the load that adapts with said sensing range to the N resistance unit, said sensing range is divided according to the size of the value of said detection electric current;
Modulus AD detecting unit is used for the voltage of said first load that form to the N resistance unit is sampled, and obtains the load voltage value, and calculates the value of said electric current to be measured according to said load voltage value.
5. current sensing means according to claim 4 is characterized in that,
Said first to the N switch element arbitrary switch element comprise: NMOSFET, or PMOSFET, or have the PMOSFET and the NMOSFET of reverse direction parasitic diode and series connection each other.
6. current sensing means according to claim 5 is characterized in that,
Said controller is connected in the grid of said PMOSFET and/or said NMOSFET, with conducting or the shutoff of controlling said PMOSFET and/or said NMOSFET.
7. an electric current detecting method is characterized in that, comprising:
With the electric current to be measured on the former limit of current sensor, act on the detection electric current of inducting on the secondary coil of said current sensor through mutual inductance;
Control first respectively to the closed of N switch element or break off, so that first to the N resistance unit forms and the different sensing ranges of said detection electric current adapt load;
Voltage to said load is sampled, and obtains the load voltage value, and calculates the value of said electric current to be measured according to said load voltage value.
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| CN103412186A (en) * | 2013-08-27 | 2013-11-27 | 国家电网公司 | Ring main unit current collecting device |
| CN103513087A (en) * | 2013-10-11 | 2014-01-15 | 上海富欣智能交通控制有限公司 | Self-adaptation load matching current collecting switching circuit |
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| CN108475982A (en) * | 2016-11-01 | 2018-08-31 | 华为技术有限公司 | A kind of switching power circuit and switch power supply current detection method |
| CN108475982B (en) * | 2016-11-01 | 2020-03-10 | 华为技术有限公司 | Switching power supply circuit and switching power supply current detection method |
| CN111771129A (en) * | 2019-01-31 | 2020-10-13 | 华为技术有限公司 | Device, method and equipment for measuring current |
| CN113169385A (en) * | 2019-08-16 | 2021-07-23 | 华为技术有限公司 | Battery pack, circuit system for measuring battery current and equipment for measuring battery current |
| CN111257786A (en) * | 2020-02-26 | 2020-06-09 | 维沃移动通信有限公司 | Working current self-checking circuit and method and electronic equipment |
| WO2021169850A1 (en) * | 2020-02-26 | 2021-09-02 | 维沃移动通信有限公司 | Working current self-checking circuit and method, and electronic device |
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