CN103825508A - Circuit structure and method for realizing low-noise and high-efficiency motor driven soft commutation control - Google Patents
Circuit structure and method for realizing low-noise and high-efficiency motor driven soft commutation control Download PDFInfo
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- CN103825508A CN103825508A CN201410104484.4A CN201410104484A CN103825508A CN 103825508 A CN103825508 A CN 103825508A CN 201410104484 A CN201410104484 A CN 201410104484A CN 103825508 A CN103825508 A CN 103825508A
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Abstract
The invention relates to a circuit structure and a method for realizing low-noise and high-efficiency motor driven soft commutation control. The circuit structure comprises a first P-channel metal oxide semiconductor (PMOS) field-effect tube, a second PMOS field-effect tube, an inductive load, a first N-channel metal oxide semiconductor (NMOS) field-effect tube, a second NMOS field-effect tube, a load current sampling resistor, a first comparator, a second comparator, a first controller and a second controller, wherein the first controller is used for opening and closing the first PMOS field-effect tube depending on an output result of the first comparator, and the second controller is used for opening and closing the second PMOS field-effect tube depending on an output result of the second comparator. Through the structures, the circuit structure and the method for realizing the low-noise and high-efficiency motor driven soft commutation control can reduce commutation impact and audible noise, improve system working reliability and save system cost; the circuit structure and the method can obviously improve system working efficiency, power density and reliability, and can widen application scope.
Description
Technical field
The present invention relates to motor Driving technique field, relate in particular to motor and drive commutation control technology field, specifically refer to that one realizes low-noise high efficiency electric motor and drives soft facies-controlled circuit structure and the method for changing.
Background technology
Because motor is with inductive load, the meeting that sharply changes due to inductive coil electric current in the time of commutation of the motor drive controller of earliest period produces serious even fatal impact, and with significant audible noise, in system, must increase necessary protection circuit could suppress this impact and noise, but, even if taked these measure results or barely satisfactory.As shown in Figure 1, in Fig. 1, VDD is power supply, P1, P2 represent PMOS field effect transistor, N1, N2 represent NMOS field effect transistor, L represents inductive load: suppose electric current (VDD → P1 → L → N2 → GND) as shown by the solid line, in the time of commutation, first to close P1 and N2, through afterflow after a while, and then open P2 and N1.As shown in Figure 2, A node voltage in VA presentation graphs 1, B node voltage in VB presentation graphs 1, the electric current in IL presentation graphs 1 on inductive load L, it is positive direction that regulation A flows to B.Due to the existence of inductive load L, can not undergo mutation by its electric current, to have no progeny at P1 and N2 pass, the body diode conducting of N1 and P2 is filled with electric current from GND to VDD, causes vdd voltage fluctuation, and follows significant audible noise.Tracing it to its cause, everything changes and causes too soon because of coil current.
In order to overcome the problems referred to above, produce soft commutation technology, the effect of this technology is significant, but has meanwhile caused considerable energy loss.Thereby this soft commutation technology is slowly to be changed and realize steady commutation by the voltage at control coil two ends, has significant IV overlapping region in commutation process.As shown in Figure 3, A node voltage in VA presentation graphs 1 in Fig. 3, B node voltage in VB presentation graphs 1, the electric current in IL presentation graphs 1 on inductive load L, it is positive direction that regulation A flows to B.
Although above-mentioned soft commutation technology has well solved the problem of phase conversion impact and audible noise, has caused great energy loss.In order to reach commutation microshock and without audible noise, to reach again the object of efficient operation, the technology that motor commutation active demand is new, this content that the present invention announces just.
Summary of the invention
The object of the invention is to overcome the shortcoming of above-mentioned prior art, provide a kind of can realize micro-phase conversion impact, without audible noise, efficient operation, raising system works reliability, significantly improve system works efficiency realize low-noise high efficiency electric motor drive soft facies-controlled circuit structure and the method for changing.
To achieve these goals, the low-noise high efficiency electric motor of realizing of the present invention drives and softly changes facies-controlled circuit structure and method has following formation:
This is realized low-noise high efficiency electric motor and drives the soft facies-controlled circuit structure that changes, and its main feature is that described circuit structure comprises:
The one PMOS field effect transistor, the input of a PMOS field effect transistor is connected with power supply;
The 2nd PMOS field effect transistor, the input of the 2nd PMOS field effect transistor is connected with power supply;
Inductive load, the first end of this inductive load is connected with the output of a described PMOS field effect transistor, and the second end of this inductive load is connected with the output of the 2nd described PMOS field effect transistor;
The one NMOS field effect transistor, an input for NMOS field effect transistor and the first end of inductive load are connected;
The 2nd NMOS field effect transistor, the input of the 2nd NMOS field effect transistor is connected with the second end of inductive load;
Load current sampling resistor, the first end of this load current sampling resistor is connected with the output of the 2nd NMOS field effect transistor with the output of a described NMOS field effect transistor respectively, the second end ground connection of this load current sampling resistor;
The first comparator, the first input end of this first comparator is inputted the first gradual change reference signal, and the second input of this first comparator is connected with the first end of described load current sampling resistor;
The second comparator, the first input end of this second comparator is inputted the second gradual change reference signal, and the second input of this second comparator is connected with the first end of described load current sampling resistor;
The first controller, in order to according to the switching of Output rusults control the one PMOS field effect transistor of the first described comparator, this first controller is connected between the output and a PMOS field effect transistor of the first described comparator;
Second controller, in order to according to the switching of Output rusults control the 2nd PMOS field effect transistor of the second described comparator, this second controller is connected between the output and the 2nd PMOS field effect transistor of the second described comparator.
Preferably, the first described controller for cutting out a PMOS field effect transistor and open a PMOS field effect transistor in the time that the voltage of the second input of the first described comparator being less than the voltage of first input end in the time that the voltage of the second input of the first described comparator is greater than the voltage of first input end;
The first described gradual change reference signal is transformed to 0V from systemic presupposition maximum within the systemic presupposition time.
Preferably, described second controller for closing the 2nd PMOS field effect transistor and open the 2nd PMOS field effect transistor in the time that the voltage of the second input of the second described comparator being less than the voltage of first input end in the time that the voltage of the second input of the second described comparator is greater than the voltage of first input end;
The second described gradual change reference signal is transformed to systemic presupposition maximum from 0V within the systemic presupposition time.
Preferably, described circuit structure also comprises:
The first switch, between the first end of the load current sampling resistor described in this first switch is connected in and the second input of the first described comparator, the first described switch disconnects in the time that the second input input current of the first described comparator is zero;
Second switch, between the first end of the load current sampling resistor described in this first switch is connected in and the second input of the second described comparator, the conducting in the time that the second input input current of the second described comparator is zero of described second switch.
The invention still further relates to a kind of circuit structure based on described and realize low-noise high efficiency electric motor and drive and softly change facies-controlled method, its main feature is that described method comprises the following steps:
(1) before commutation prerequisite, the systemic presupposition time starts the first comparator and closes the second comparator, and the first described controller is according to the switching of Output rusults control the one PMOS field effect transistor of the first described comparator;
(2) when the electric current passing through when described load current sampling resistor reduces to zero, start the second comparator and close the first comparator, described second controller is according to the switching of Output rusults control the 2nd PMOS field effect transistor of the second described comparator.
Preferably, the first described controller, according to the switching of Output rusults control the one PMOS field effect transistor of the first described comparator, comprises the following steps:
(11) the first described gradual change reference signal is transformed to 0V from systemic presupposition maximum within the systemic presupposition time, in the time that the voltage of the second input of the first described comparator is greater than the voltage of first input end, the first described controller cuts out a PMOS field effect transistor;
(12) in the time that the voltage of the second input of the first described comparator is less than the voltage of first input end, described the first controller opens the one PMOS field effect transistor.
Preferably, described second controller, according to the switching of Output rusults control the 2nd PMOS field effect transistor of the second described comparator, comprises the following steps:
(21) the second described gradual change reference signal is transformed to systemic presupposition maximum from 0V within the systemic presupposition time, in the time that the voltage of the second input of the second described comparator is greater than the voltage of first input end, described second controller is closed the 2nd PMOS field effect transistor;
(22) in the time that the voltage of the second input of the second described comparator is less than the voltage of first input end, described second controller is opened the 2nd PMOS field effect transistor.
Adopt the low-noise high efficiency electric motor of realizing in this invention to drive soft facies-controlled circuit structure and the method for changing, there is following beneficial effect:
The invention provides a kind of brand-new motor and drive soft facies-controlled circuit structure and the method for changing, realized micro-phase conversion impact and without the audible noise object of efficient operation again simultaneously.Method of the present invention, compared with the Electric Machine Control of earliest period, can reduce phase conversion impact and audible noise, improves system works reliability and saves system cost; The soft commutation technology of the more existing motor of method of the present invention, can significantly improve system works efficiency, improves power density and improve reliability, has range of application widely.
Accompanying drawing explanation
Fig. 1 is commutation circuit structural representation in prior art.
Fig. 2 is that in prior art, motor drives the associated electrical signals schematic diagram in the time of commutation.
Fig. 3 is associated electrical signals schematic diagram when soft commutation technology commutation in prior art.
Fig. 4 is that the low-noise high efficiency electric motor of realizing of the present invention drives the soft structural representation that changes facies-controlled circuit structure.
Fig. 5 is the soft facies-controlled associated electrical signals schematic diagram that changes of the present invention.
Embodiment
In order more clearly to describe technology contents of the present invention, conduct further description below in conjunction with specific embodiment.
Feature of the present invention is that soft commutation technology of the present invention is sampling coil electric current, described coil current and set curent change speed is by comparator control switch, thereby the pace of change of control coil electric current realizes.So not only reached micro-phase conversion impact and without the object of audible noise but also realized the object of efficient operation.
As shown in Figure 4, in Fig. 4, P1, P2 represent PMOS field effect transistor, N1, N2 represent NMOS field effect transistor, Vref1, Vref2 are gradual change reference voltage signal, while being used for controlling commutation by the curent change speed on L: suppose current direction (VDD → P1 → L → N2 → GND) as shown in Fig. 4 solid line, start for the previous period Comp1 comparator (now Comp2 comparator is closed) in commutation prerequisite, control the driving signal of P1, make the envelope decline (Imaxp → 0) of electric current along regulation; Drop to after 0 in the electric current on inductive load L, start Comp2 comparator (now Comp1 comparator is closed), control the driving signal of P2, make the envelope rising (0 → Imaxn) of electric current along regulation.
For making the object, technical solutions and advantages of the present invention clearer, a kind of concrete execution mode of giving an example is below explained in detail.Note, implementation example described herein only, for explanation, is not limited to the present invention.Many variations based on following execution mode and modification, also can realize the every claim of the application technical scheme required for protection.
As shown in Figures 4 and 5, in Fig. 5, P1, P2 represent PMOS field effect transistor, and N1, N2 represent NMOS field effect transistor, the electric current in IL presentation graphs 4 on inductive load L, and regulation A flows to B for square.The rotating speed of supposing motor is 3000 to turn, i.e. rotation period 20ms, and coil maximum current is 1A.Electric current is flowed to the time of B and is respectively accounted for half, i.e. each 10ms by the time that B flows to A by A so.The detection frequency of setting Comp1 and Comp2 is the audiorange that 25KHz(exceeds 20KHz), to set the soft commutation time be rotation period 10%, RCS=1 ohm, in electric current commutation, start timing (supposing that commutation after-current flows to B:VDD → P1 → L → N2 → GND by A), after 9ms, open current comparator Comp1(now comparator C omp2 close), and the time of setting Vref1 process 1ms is changed to 0V from 1V, electric current within the time of this 1ms on the detection inductive load L of Comp1 meeting Cycle by Cycle, if the electric current in sense cycle on L is greater than Vref1/RCS, Logic1 just exports high level P1 is turn-offed, the body diode of N1 is opened to L afterflow (current direction: GND → N1 → L → N2 → GND), electric current starts decay, until next sense cycle arrives, if being less than Vref1/RCS Logic1, with regard to output low level, P1 is opened to L charging (current direction: VDD → P1 → L → N2 → GND) in the electric current on L, to maintain the electric current smooth change on L, until the electric current being flushed on L is greater than Vref1/RCS, close again P1 ..., so go round and begin again until the electric current on L reduces to 0.In electric current on L reduces to 0, open current comparator Comp2(now comparator C omp1 close) start commutation.When starting commutation, start timing, and the time of setting Vref2 process 1ms is changed to 1V from 0V, electric current within the time of this 1ms on the detection inductive load L of Comp2 meeting Cycle by Cycle, if the electric current in sense cycle on L is less than Vref2/RCS, Logic2 will export a low level and open P2 to L charging (current direction: VDD → P2 → L → N1 → GND), until the electric current on L is greater than Vref2/RCS, then a high level of Logic2 output is closed P2(current direction: GND → N2 → L → N1 → GND), to maintain the electric current smooth change on L, until next sense cycle arrives ... so go round and begin again, until the electric current on L is increased to 1A, electric current on L has just completed by A and has flowed to B to the commutation process that is flowed to A by B like this., flow to A to being flowed to the commutation process of B by A and flowed to B by A similar to the commutation process that is flowed to A by B by B, just no longer repeat at this.(note, the sense cycle in commutation process can be set to a minimum turn-off time and a minimum opening time in actual applications, to guarantee that switching frequency does not drop on audiorange)
Adopt the low-noise high efficiency electric motor of realizing in this invention to drive soft facies-controlled circuit structure and the method for changing, there is following beneficial effect:
The invention provides a kind of brand-new motor and drive soft facies-controlled circuit structure and the method for changing, realized micro-phase conversion impact and without the audible noise object of efficient operation again simultaneously.Method of the present invention, compared with the Electric Machine Control of earliest period, can reduce phase conversion impact and audible noise, improves system works reliability and saves system cost; The soft commutation technology of the more existing motor of method of the present invention, can significantly improve system works efficiency, improves power density and improve reliability, has range of application widely.
In this specification, the present invention is described with reference to its specific embodiment.But, still can make various modifications and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (7)
1. realize low-noise high efficiency electric motor and drive the soft facies-controlled circuit structure that changes, it is characterized in that, described circuit structure comprises:
The one PMOS field effect transistor, the input of a PMOS field effect transistor is connected with power supply;
The 2nd PMOS field effect transistor, the input of the 2nd PMOS field effect transistor is connected with power supply;
Inductive load, the first end of this inductive load is connected with the output of a described PMOS field effect transistor, and the second end of this inductive load is connected with the output of the 2nd described PMOS field effect transistor;
The one NMOS field effect transistor, an input for NMOS field effect transistor and the first end of inductive load are connected;
The 2nd NMOS field effect transistor, the input of the 2nd NMOS field effect transistor is connected with the second end of inductive load;
Load current sampling resistor, the first end of this load current sampling resistor is connected with the output of the 2nd NMOS field effect transistor with the output of a described NMOS field effect transistor respectively, the second end ground connection of this load current sampling resistor;
The first comparator, the first input end of this first comparator is inputted the first gradual change reference signal, and the second input of this first comparator is connected with the first end of described load current sampling resistor;
The second comparator, the first input end of this second comparator is inputted the second gradual change reference signal, and the second input of this second comparator is connected with the first end of described load current sampling resistor;
The first controller, in order to according to the switching of Output rusults control the one PMOS field effect transistor of the first described comparator, this first controller is connected between the output and a PMOS field effect transistor of the first described comparator;
Second controller, in order to according to the switching of Output rusults control the 2nd PMOS field effect transistor of the second described comparator, this second controller is connected between the output and the 2nd PMOS field effect transistor of the second described comparator.
2. the low-noise high efficiency electric motor of realizing according to claim 1 drives the soft facies-controlled circuit structure that changes, it is characterized in that, the first described controller for cutting out a PMOS field effect transistor and open a PMOS field effect transistor in the time that the voltage of the second input of the first described comparator being less than the voltage of first input end in the time that the voltage of the second input of the first described comparator is greater than the voltage of first input end;
The first described gradual change reference signal is transformed to 0V from systemic presupposition maximum within the systemic presupposition time.
3. the low-noise high efficiency electric motor of realizing according to claim 1 drives the soft facies-controlled circuit structure that changes, it is characterized in that, described second controller for closing the 2nd PMOS field effect transistor and open the 2nd PMOS field effect transistor in the time that the voltage of the second input of the second described comparator being less than the voltage of first input end in the time that the voltage of the second input of the second described comparator is greater than the voltage of first input end;
The second described gradual change reference signal is transformed to systemic presupposition maximum from 0V within the systemic presupposition time.
4. the low-noise high efficiency electric motor of realizing according to claim 1 drives the soft facies-controlled circuit structure that changes, and it is characterized in that, described circuit structure also comprises:
The first switch, between the first end of the load current sampling resistor described in this first switch is connected in and the second input of the first described comparator, the first described switch disconnects in the time that the second input input current of the first described comparator is zero;
Second switch, between the first end of the load current sampling resistor described in this first switch is connected in and the second input of the second described comparator, the conducting in the time that the second input input current of the second described comparator is zero of described second switch.
5. the circuit structure based on described in any one in claim 1 to 4 is realized low-noise high efficiency electric motor and is driven the soft facies-controlled method of changing, and it is characterized in that, described method comprises the following steps:
(1) before commutation prerequisite, the systemic presupposition time starts the first comparator and closes the second comparator, and the first described controller is according to the switching of Output rusults control the one PMOS field effect transistor of the first described comparator;
(2) when the electric current passing through when described load current sampling resistor reduces to zero, start the second comparator and close the first comparator, described second controller is according to the switching of Output rusults control the 2nd PMOS field effect transistor of the second described comparator.
6. the low-noise high efficiency electric motor of realizing according to claim 5 drives the soft facies-controlled method of changing, it is characterized in that, the first described controller, according to the switching of Output rusults control the one PMOS field effect transistor of the first described comparator, comprises the following steps:
(11) the first described gradual change reference signal is transformed to 0V from systemic presupposition maximum within the systemic presupposition time, in the time that the voltage of the second input of the first described comparator is greater than the voltage of first input end, the first described controller cuts out a PMOS field effect transistor;
(12) in the time that the voltage of the second input of the first described comparator is less than the voltage of first input end, described the first controller opens the one PMOS field effect transistor.
7. the low-noise high efficiency electric motor of realizing according to claim 5 drives the soft facies-controlled method of changing, it is characterized in that, described second controller, according to the switching of Output rusults control the 2nd PMOS field effect transistor of the second described comparator, comprises the following steps:
(21) the second described gradual change reference signal is transformed to systemic presupposition maximum from 0V within the systemic presupposition time, in the time that the voltage of the second input of the second described comparator is greater than the voltage of first input end, described second controller is closed the 2nd PMOS field effect transistor;
(22) in the time that the voltage of the second input of the second described comparator is less than the voltage of first input end, described second controller is opened the 2nd PMOS field effect transistor.
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| CN108173475A (en) * | 2018-02-11 | 2018-06-15 | 矽力杰半导体技术(杭州)有限公司 | Motor driver and motor |
| CN109617461A (en) * | 2018-12-27 | 2019-04-12 | 绍兴光大芯业微电子有限公司 | Method applied to motor commutation control |
| CN110061611A (en) * | 2019-05-27 | 2019-07-26 | 晶艺半导体有限公司 | Active false load, switching power converters and control method |
| CN113949254A (en) * | 2021-11-03 | 2022-01-18 | 上海灿瑞科技股份有限公司 | System and method for controlling clamping protection function of H-bridge drive circuit |
| CN114257144A (en) * | 2020-09-22 | 2022-03-29 | 致新科技股份有限公司 | Motor controller |
| CN117792155A (en) * | 2024-02-23 | 2024-03-29 | 晶艺半导体有限公司 | Soft commutation control circuit and method for motor drive and motor drive system |
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| CN110061611A (en) * | 2019-05-27 | 2019-07-26 | 晶艺半导体有限公司 | Active false load, switching power converters and control method |
| CN114257144A (en) * | 2020-09-22 | 2022-03-29 | 致新科技股份有限公司 | Motor controller |
| CN114257144B (en) * | 2020-09-22 | 2023-08-11 | 致新科技股份有限公司 | Motor controller |
| CN113949254A (en) * | 2021-11-03 | 2022-01-18 | 上海灿瑞科技股份有限公司 | System and method for controlling clamping protection function of H-bridge drive circuit |
| CN113949254B (en) * | 2021-11-03 | 2024-04-05 | 上海灿瑞科技股份有限公司 | Clamping protection function control system and method for H-bridge driving circuit |
| CN117792155A (en) * | 2024-02-23 | 2024-03-29 | 晶艺半导体有限公司 | Soft commutation control circuit and method for motor drive and motor drive system |
| CN117792155B (en) * | 2024-02-23 | 2024-06-07 | 晶艺半导体有限公司 | Soft commutation control circuit and method for motor drive and motor drive system |
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| CN103825508B (en) | 2016-06-08 |
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