CN203574578U - Current detection circuit for motor driving chips - Google Patents
Current detection circuit for motor driving chips Download PDFInfo
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- CN203574578U CN203574578U CN201320755119.0U CN201320755119U CN203574578U CN 203574578 U CN203574578 U CN 203574578U CN 201320755119 U CN201320755119 U CN 201320755119U CN 203574578 U CN203574578 U CN 203574578U
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Abstract
The utility model discloses a current detection circuit for motor driving chips. According to the circuit, current detection is completed by using only one comparator. Negative-phase input of the comparator is the terminal voltage Vsense of a motor resistor, positive-phase input of the comparator is the reference voltage Vref or '0' voltage, and an enable signal is introduced into the comparator according to attenuation of motor current to select an input signal to be the reference voltage Vref or '0' voltage. The comparator comprises a reference circuit, a differential comparator and a common-emitter amplifier. When the motor current is in a rising stage, the input of the comparator is Vref, and when the Vsense is greater than Vref, high level is output, and output peak current setting is realized; and when the motor current is in a rapid attenuation stage, the positive-phase input of the comparator is '0' voltage, and when the Vsense is greater than '0', high level is output, and reverse current protection is realized. Compared with a traditional current detection circuit, the current detection circuit of the utility model is simpler in structure and lower in cost.
Description
Technical field
The utility model relates to a kind of current detection circuit for motor drive ic, relates in particular to the current detection circuit of motor when mixing evanescent mode and having synchronous rectification.
Background technology
Stepping motor is that first stepping motor part is controlled in a kind of open loop that changes electric impulse signal into angular displacement or displacement of the lines.When step actuator receives after pulse signal, with regard to Driving Stepping Motor, by the direction of setting, rotate a fixing angle, i.e. step angle, the rotation of stepping motor is that the angle of fixing is moved step by step.Stepping motor can pass through control impuls number pilot angle displacement, to reach the object of accurate location, can pass through speed and the acceleration of control impuls FREQUENCY CONTROL electric machine rotation, to reach the object of speed governing simultaneously.
At present, stepping motor adopts electric current close classification to segment to step angle substantially.The current point obtaining after electric current in motor coil is discrete according to sine wave, as segmentation point, when the electric current of motor coil has reached after the segmentation point of setting, is controlled motor coil electric current by circuit and is entered attenuation process.Otherwise stepping motor will angle of arrival overshoot consequence, cause the bad phenomenon such as stepping motor location is inaccurate, and running is not steady.And different according to the speed of service of stepping motor, the decay mode of taking is respective change also.Decay mode is divided three classes: fast evanescent mode, slow evanescent mode and mixing evanescent mode.
Adopting the stepping motor that mixes evanescent mode and there is synchronous rectification to drive in chip, when current of electric is during in ascent stage, more than the electric current of output need to be controlled at stationary value, therefore need to realize by current detection circuit the setting of output peak current.When motor is during in quick decay, because decay is too fast, may there is electric current adverse current, cause motor fluctuation of service, at this moment, need in current attenuation, during to " 0 ", close synchronous rectification by current detection circuit, prevent electric current adverse current.
Conventional current testing circuit adopts two comparators conventionally, and as shown in Figure 1, in the Current rise stage, current detection circuit is to the resistance terminal voltage V detecting
sensewith reference voltage V
refcompare, realize the setting of output peak current.When the situation of current of electric in quick decay, current detection circuit is to resistance terminal voltage V
sensewith voltage " 0 ", ground connection as shown in Figure 1, compares, to prevent electric current adverse current.But adopt two comparators, structure is too complicated.
Therefore, those skilled in the art is devoted to develop a kind of current detection circuit simple in structure, to realize the electric current to motor drive ic.
Utility model content
Because the above-mentioned defect of prior art, technical problem to be solved in the utility model is to provide the current detection circuit for motor drive ic of a comparator of a kind of employing.
For achieving the above object, the utility model provides a kind of current detection circuit for motor drive ic, it is characterized in that, described current detection circuit adopts a comparator to complete, described comparator negative is input as the terminal voltage of motor resistance, and the positive of described comparator is input as reference voltage (V
ref) or directly grounded " 0 " voltage;
Described comparator comprises some resistance, some metal-oxide-semiconductors, some inductance, reference circuit, differential comparator and cascode level amplifier;
Described reference circuit comprises metal-oxide-semiconductor (M1), resistance (R1) and transistor (Q1), and described reference circuit is for generation of constant voltage (V
b);
Described differential comparator comprises transistor (Q2), transistor (Q3), transistor (Q4), transistor (Q5), transistor (Q6), transistor (Q7), metal-oxide-semiconductor (M3), metal-oxide-semiconductor (M4) and metal-oxide-semiconductor (M5), and employing collects cascode input altogether; Terminal voltage (the V of described motor resistance
sense) by the base stage of described transistor (Q2), be input in described comparator described reference voltage (V
ref) or the base stage of described " 0 " voltage by described transistor (Q7) be input to described comparator;
Described cascode level amplifier comprises metal-oxide-semiconductor (M6) and transistor (Q8);
Output signal (out) between the emitter of the source electrode of described metal-oxide-semiconductor (M6) and described transistor (Q8), the level of described output signal (out) is controlled by described differential comparator and described cascode level amplifier.
Further, source electrode and the power supply (V of the described metal-oxide-semiconductor (M1) of described reference circuit
dD) be connected, drain electrode is connected with the collector electrode of described transistor (Q1) by described resistance (R1); The emitter of described transistor (Q1) is connected with ground (GND), and base stage is connected with the drain electrode of described metal-oxide-semiconductor (M1).
Further, in described differential comparator, the emitter of the collector electrode of described transistor (Q2), the emitter of described transistor (Q5), described transistor (Q6) is connected with described ground (GND) with the collector electrode of described transistor (Q7); The base stage of described transistor (Q2) is connected by described inductance with the emitter of described transistor (Q9), and emitter is connected with the base stage of described transistor (Q3); The emitter of described transistor (Q3) is by described metal-oxide-semiconductor (M4) and described power supply (V
dD) connect, collector electrode is connected with the collector electrode of described transistor (Q5); The base stage of described transistor (Q5) is connected with the base stage of described transistor (Q6) with the collector electrode of described transistor (Q3) respectively; The collector electrode of described transistor (Q6) is connected with the collector electrode of described transistor (Q4); The emitter of described transistor (Q4) is connected with described power supply (VDD) by described metal-oxide-semiconductor (M4), and base stage is connected with the emitter of described transistor (Q7);
The source electrode of the source electrode of the source electrode of described metal-oxide-semiconductor (M3), described metal-oxide-semiconductor (M4) and described metal-oxide-semiconductor (M5) and described power supply (V
dD) be connected; The drain electrode of described metal-oxide-semiconductor (M3) is connected with the base stage of described transistor (Q3); The drain electrode of described metal-oxide-semiconductor (M4) is connected with the emitter of described transistor (Q4) respectively at described transistor (Q3); The drain electrode of described metal-oxide-semiconductor (M5) is connected with the base stage of described transistor (Q4).
Further, in described cascode level amplifier, the drain electrode of described metal-oxide-semiconductor (M6) is connected with the collector electrode of described transistor (Q8), source electrode and described power supply (V
dD) be connected; The emitter of described transistor (Q8) is connected with described ground (GND), and base stage is connected with the collector electrode of described transistor (Q6) with the collector electrode of described transistor (Q4).
Further, the grid of described metal-oxide-semiconductor (M1), described metal-oxide-semiconductor (M2), described metal-oxide-semiconductor (M3), described metal-oxide-semiconductor (M4), described metal-oxide-semiconductor (M5) and described metal-oxide-semiconductor (M6) links together.
Further, described comparator has also been introduced enable signal (EN) at the grid of described metal-oxide-semiconductor (M7) and the grid of described metal-oxide-semiconductor (M9).
Further, the described enable signal (EN) of the grid of described metal-oxide-semiconductor (M9) is selected described reference signal (V according to the situation of current of electric
ref) or described " 0 " voltage as input signal, be input to described current detection circuit.
Further, described enable signal (EN) drives described metal-oxide-semiconductor (M7) according to the situation of current of electric, and when described metal-oxide-semiconductor (M7) conducting, the terminal voltage (V of described motor resistance
sense) be subject to described constant voltage (V
b) clamper.
In a preferred embodiment of the present utility model, described metal-oxide-semiconductor (M1), described metal-oxide-semiconductor (M2), described metal-oxide-semiconductor (M3), described metal-oxide-semiconductor (M4), described metal-oxide-semiconductor (M5), described metal-oxide-semiconductor (M6) and described metal-oxide-semiconductor (M7) are NMOS pipes, and described metal-oxide-semiconductor (M8) and described metal-oxide-semiconductor (M9) are PMOS pipes.
In a preferred embodiment of the present utility model, described transistor (Q1), described transistor (Q5), described transistor (Q6), described transistor (Q8) and described transistor (Q9) adopt NPN transistor; Described transistor (Q2), described transistor (Q3), described transistor (Q4) and described transistor (Q7) adopt PNP transistor.
In a better embodiment of the present utility model, current detection circuit has a comparator to complete, and comparator comprises: metal-oxide-semiconductor, resistance, inductance, reference circuit, differential comparator and cascode comparator.Reference voltage V
refor the terminal voltage V of " 0 " voltage, motor resistance
senseas input signal, be input in comparator.In comparator, introduced enable signal EN, enable signal EN changes according to the ascent stage of current of electric or decling phase simultaneously, and current of electric is in ascent stage, and enable signal EN is high level; Current of electric is in the quick decling phase, and enable signal EN is in low level.
At current of electric, during in ascent stage, enable signal EN is high level, and the positive of comparator is input as V
ref, when comparator detects V
sensebe greater than V
reftime, comparator output high level.
At current of electric, during in the quick decling phase, enable signal EN is low level, and the positive of comparator is input as " 0 " voltage, when V being detected
sensewhile being greater than " 0 ", comparator output high level.
A kind of current detection circuit for motor drive ic of the present utility model, only adopts a comparator, has realized and in Current rise pattern, has set output peak current, in the quick evanescent mode of electric current, carries out reverse current protection.The utility model is simpler compared to traditional current detection circuit structure, and cost is also lower.
Below with reference to accompanying drawing, the technique effect of design of the present utility model, concrete structure and generation is described further, to understand fully the purpose of this utility model, feature and effect.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of traditional current detection circuit;
Fig. 2 is the structural representation of a kind of current detection circuit for motor drive ic of the present utility model;
Fig. 3 is the particular circuit configurations figure of the comparator of a kind of current detection circuit for motor drive ic of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is elaborated: the present embodiment is implemented under with technical solutions of the utility model prerequisite; provided detailed execution mode and concrete operating process, but protection range of the present utility model is not limited to following embodiment.
The structure of a kind of current detection circuit for motor drive ic of the present utility model as shown in Figure 2, only comprises a comparator, and the positive of comparator is input as reference voltage V
refor " 0 " voltage, is specifically determined by the residing stage of current of electric, in ascent stage, is input as reference voltage V
ref; In the quick decling phase, be input as " 0 " voltage.The negative of comparator is input as the terminal voltage V of motor resistance
sense.
The physical circuit of comparator as shown in Figure 3, comprises some resistance, some metal-oxide-semiconductors, some inductance, reference circuit, differential comparator and cascode level amplifier;
Reference circuit comprises metal-oxide-semiconductor M1, resistance R 1 and transistor Q1.The source electrode of metal-oxide-semiconductor M1 and power supply V
dDbe connected, drain electrode is connected with the collector electrode of transistor Q1 by resistance R 1; The emitter of the transistor Q1 of institute is connected with ground GND, and base stage is connected with the drain electrode of metal-oxide-semiconductor M1.Between resistance R 1 and the collector electrode of transistor Q1, export constant voltage V
b.
Differential comparator comprises transistor Q2, transistor Q3, transistor Q4, transistor Q5, transistor Q6, transistor Q7, metal-oxide-semiconductor M3, metal-oxide-semiconductor M4 and metal-oxide-semiconductor M5, and employing collects cascode input altogether.The terminal voltage V of motor resistance
sensebase stage by transistor Q2 is input in comparator, reference voltage V
refor the base stage of " 0 " voltage by transistor Q7 is input to comparator.The collector electrode of the transistor Q2 of differential comparator, the emitter of transistor Q5, the emitter of transistor Q6 and the collector electrode of transistor Q7 are connected with ground GND; The base stage of transistor Q2 is connected by inductance with the emitter of transistor Q9, and emitter is connected with the base stage of transistor Q3; The emitter of transistor Q3 is by metal-oxide-semiconductor M4 and power supply V
dDconnect, collector electrode is connected with the collector electrode of transistor Q5; The base stage of transistor Q5 is connected with the base stage of transistor Q6 with the collector electrode of transistor Q3 respectively; The collector electrode of transistor Q6 is connected with the collector electrode of transistor Q4; The emitter of transistor Q4 is connected with power vd D by metal-oxide-semiconductor M4, and base stage is connected with the emitter of transistor Q7; The source electrode of the source electrode of the source electrode of metal-oxide-semiconductor M3, metal-oxide-semiconductor M4, metal-oxide-semiconductor M5 and power supply V
dDbe connected; The drain electrode of metal-oxide-semiconductor M3 is connected with the base stage of transistor Q3; The drain electrode of metal-oxide-semiconductor M4 is connected with the emitter of transistor Q4 with transistor Q3 respectively; The drain electrode of metal-oxide-semiconductor M5 is connected with the base stage of transistor Q4.
Cascode level amplifier comprises metal-oxide-semiconductor M6 and transistor Q8, and the drain electrode of metal-oxide-semiconductor M6 is connected with the collector electrode of transistor Q8,, the source electrode of metal-oxide-semiconductor M6 and power supply V
dDbe connected; The emitter of transistor Q8 is connected with ground GND, and base stage is connected with the collector electrode of transistor Q6 with the collector electrode of transistor Q4.
Output signal out between the emitter of the source electrode of metal-oxide-semiconductor M6 and transistor Q8, the level of output signal out is controlled by differential comparator and cascode level amplifier.
Comparator also comprises metal-oxide-semiconductor M7, metal-oxide-semiconductor M8 and metal-oxide-semiconductor M9, and, at the grid of metal-oxide-semiconductor M7 and the grid of metal-oxide-semiconductor M9, introduced enable signal EN.The enable signal EN at metal-oxide-semiconductor M7 place is according to the situation driven MOS pipe M7 of current of electric, and when metal-oxide-semiconductor M7 conducting, makes the terminal voltage V of motor resistance
sensebe subject to constant voltage V
bclamper.The enable signal EN at metal-oxide-semiconductor M9 place selects reference signal V according to the situation of current of electric
refor " 0 " voltage is input to current detection circuit as input signal.
Further, the grid of metal-oxide-semiconductor M1, metal-oxide-semiconductor M2, metal-oxide-semiconductor M3, metal-oxide-semiconductor M4, metal-oxide-semiconductor M5 and metal-oxide-semiconductor M6 links together.
In a preferred embodiment of the present utility model, metal-oxide-semiconductor M1, metal-oxide-semiconductor M2, metal-oxide-semiconductor M3, metal-oxide-semiconductor M4, metal-oxide-semiconductor M5, metal-oxide-semiconductor M6 and metal-oxide-semiconductor M7 adopt NMOS pipe, and metal-oxide-semiconductor M8 and metal-oxide-semiconductor M9 adopt PMOS pipe.
In a preferred embodiment of the present utility model, transistor Q1, transistor Q5, transistor Q6, transistor Q8 and transistor Q9 adopt NPN transistor; Transistor Q2, transistor Q3, transistor Q4 and described transistor Q7 adopt PNP transistor.
A kind of current detection circuit for motor drive ic of the present utility model, in its comparator, introduced enable signal EN, enable signal EN changes according to the ascent stage of current of electric or decling phase, and current of electric is in ascent stage, and enable signal EN is high level; Current of electric is in the quick decling phase, and enable signal EN is in low level.
At current of electric, during in ascent stage, enable signal EN is high level, metal-oxide-semiconductor M9 conducting, and metal-oxide-semiconductor M7 and metal-oxide-semiconductor M8 cut-off, the positive of comparator is input as reference voltage V
ref.Now, electric current is in ascent stage, i.e. the terminal voltage V of motor resistance
sensefrom " 0 ", start slowly to become large, transistor Q9 turn-offs, constant voltage V
bnot to motor resistance terminal voltage V
senseexert an influence.When comparator detects V
sensebe greater than V
reftime, comparator output signal out is high level, realizes the setting of output peak current.
At current of electric, during in the quick decling phase, enable signal EN is low level, metal-oxide-semiconductor M9 cut-off, and metal-oxide-semiconductor M7 and metal-oxide-semiconductor M8 conducting, the positive of comparator is input as " 0 " voltage.In order to drop to " 0 " at output current, just make before comparator work, the metal-oxide-semiconductor M7 of conducting introduces an imbalance, now motor resistance terminal voltage V simultaneously
sensefrom negative voltage, start slowly to increase, due under quick evanescent mode, motor resistance terminal voltage V
sensemay arrive a very negative value, can make like this transistor of comparator and metal-oxide-semiconductor enter saturation region, affect the speed of comparator, therefore by constant voltage V
bclamper V
sensenegative peak, avoid body pipe and the metal-oxide-semiconductor of comparator in quick evanescent mode to enter saturation region, when motor resistance terminal voltage V being detected
sensewhile being greater than " 0 ", comparator output signal out is high level, realizes reverse current protection.
More than describe preferred embodiment of the present utility model in detail.The ordinary skill that should be appreciated that this area just can be made many modifications and variations according to design of the present utility model without creative work.Therefore, all technical staff in the art comply with design of the present utility model on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment, all should be in the determined protection range by claims.
Claims (9)
1. for a current detection circuit for motor drive ic, it is characterized in that, described current detection circuit adopts a comparator to complete, and described comparator negative is input as the terminal voltage (V of motor resistance
sense), the positive of described comparator is input as reference voltage (V
ref) or directly grounded " 0 " voltage;
Described comparator comprises some resistance, some metal-oxide-semiconductors, some inductance, reference circuit, differential comparator and cascode level amplifier; At the grid of described metal-oxide-semiconductor (M7) and the grid of described metal-oxide-semiconductor (M9), introduced enable signal (EN); The level of described enable signal (EN) is controlled by the situation of current of electric;
Described reference circuit comprises metal-oxide-semiconductor (M1), resistance (R1) and transistor (Q1), and described reference circuit is for generation of constant voltage (V
b);
Described differential comparator comprises transistor (Q2), transistor (Q3), transistor (Q4), transistor (Q5), transistor (Q6), transistor (Q7), metal-oxide-semiconductor (M3), metal-oxide-semiconductor (M4) and metal-oxide-semiconductor (M5);
Terminal voltage (the V of described motor resistance
sense) by the base stage of described transistor (Q2), be input in described comparator described reference voltage (V
ref) or the base stage of described " 0 " voltage by described transistor (Q7) be input to described comparator;
Described cascode level amplifier comprises metal-oxide-semiconductor (M6) and transistor (Q8);
Output signal (out) between the emitter of the source electrode of described metal-oxide-semiconductor (M6) and described transistor (Q8),
The level of described output signal (out) is controlled by described differential comparator and described cascode level amplifier.
2. a kind of current detection circuit for motor drive ic as claimed in claim 1, wherein, source electrode and the power supply (V of the described metal-oxide-semiconductor (M1) of described reference circuit
dD) be connected, drain electrode is connected with the collector electrode of described transistor (Q1) by described resistance (R1); The emitter of described transistor (Q1) is connected with ground (GND), and base stage is connected with the drain electrode of described metal-oxide-semiconductor (M1).
3. a kind of current detection circuit for motor drive ic as claimed in claim 1, wherein, in described differential comparator, the emitter of the collector electrode of described transistor (Q2), the emitter of described transistor (Q5), described transistor (Q6) is connected with described ground (GND) with the collector electrode of described transistor (Q7); The base stage of described transistor (Q2) is connected by described inductance with the emitter of described transistor (Q9), and emitter is connected with the base stage of described transistor (Q3); The emitter of described transistor (Q3) is by described metal-oxide-semiconductor (M4) and described power supply (V
dD) connect, collector electrode is connected with the collector electrode of described transistor (Q5); The base stage of described transistor (Q5) is connected with the base stage of described transistor (Q6) with the collector electrode of described transistor (Q3) respectively; The collector electrode of described transistor (Q6) is connected with the collector electrode of described transistor (Q4); The emitter of described transistor (Q4) is by described metal-oxide-semiconductor (M4) and described power supply (V
dD) connect, base stage is connected with the emitter of described transistor (Q7);
The source electrode of the source electrode of the source electrode of described metal-oxide-semiconductor (M3), described metal-oxide-semiconductor (M4) and described metal-oxide-semiconductor (M5) and described power supply (V
dD) be connected; The drain electrode of described metal-oxide-semiconductor (M3) is connected with the base stage of described transistor (Q3); The drain electrode of described metal-oxide-semiconductor (M4) is connected with the emitter of described transistor (Q4) respectively at described transistor (Q3); The drain electrode of described metal-oxide-semiconductor (M5) is connected with the base stage of described transistor (Q4).
4. a kind of current detection circuit for motor drive ic as claimed in claim 1, wherein, in described cascode level amplifier, the drain electrode of described metal-oxide-semiconductor (M6) is connected with the collector electrode of described transistor (Q8), source electrode and described power supply (V
dD) be connected; The emitter of described transistor (Q8) is connected with described ground (GND), and base stage is connected with the collector electrode of described transistor (Q6) with the collector electrode of described transistor (Q4).
5. a kind of current detection circuit for motor drive ic as claimed in claim 1, wherein, in described comparator, the grid of described metal-oxide-semiconductor (M1), described metal-oxide-semiconductor (M2), described metal-oxide-semiconductor (M3), described metal-oxide-semiconductor (M4), described metal-oxide-semiconductor (M5) and described metal-oxide-semiconductor (M6) links together.
6. a kind of current detection circuit for motor drive ic as claimed in claim 1, wherein, the described enable signal (EN) of the grid of described metal-oxide-semiconductor (M9) is selected described reference signal (V according to the situation of current of electric
ref) or described " 0 " voltage as input signal, be input to described current detection circuit.
7. a kind of current detection circuit for motor drive ic as claimed in claim 1, wherein, described enable signal (EN) drives described metal-oxide-semiconductor (M7) according to the situation of current of electric, and when described metal-oxide-semiconductor (M7) conducting, the terminal voltage (V of described motor resistance
sense) be subject to described constant voltage (V
b) clamper.
8. a kind of current detection circuit for motor drive ic as claimed in claim 1, wherein, described metal-oxide-semiconductor (M1), described metal-oxide-semiconductor (M2), described metal-oxide-semiconductor (M3), described metal-oxide-semiconductor (M4), described metal-oxide-semiconductor (M5), described metal-oxide-semiconductor (M6) and described metal-oxide-semiconductor (M7) are NMOS pipes, and described metal-oxide-semiconductor (M8) and described metal-oxide-semiconductor (M9) are PMOS pipes.
9. a kind of current detection circuit for motor drive ic as claimed in claim 1, wherein, described transistor (Q1), described transistor (Q5), described transistor (Q6), described transistor (Q8) and described transistor (Q9) adopt NPN transistor; Described transistor (Q2), described transistor (Q3), described transistor (Q4) and described transistor (Q7) adopt PNP transistor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320755119.0U CN203574578U (en) | 2013-11-25 | 2013-11-25 | Current detection circuit for motor driving chips |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320755119.0U CN203574578U (en) | 2013-11-25 | 2013-11-25 | Current detection circuit for motor driving chips |
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| Publication Number | Publication Date |
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| CN203574578U true CN203574578U (en) | 2014-04-30 |
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ID=50542287
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633908A (en) * | 2013-11-25 | 2014-03-12 | 嘉兴中润微电子有限公司 | Current detection circuit used for motor driving chip |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633908A (en) * | 2013-11-25 | 2014-03-12 | 嘉兴中润微电子有限公司 | Current detection circuit used for motor driving chip |
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Granted publication date: 20140430 |