CN206712693U - Delaying current control device - Google Patents
Delaying current control device Download PDFInfo
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- CN206712693U CN206712693U CN201720305842.7U CN201720305842U CN206712693U CN 206712693 U CN206712693 U CN 206712693U CN 201720305842 U CN201720305842 U CN 201720305842U CN 206712693 U CN206712693 U CN 206712693U
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- circuit
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- drive control
- control circuit
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Abstract
The utility model discloses a kind of delaying current control device.Described device includes：Current sampling circuit, delay circuit and voltage comparator circuit；Current sampling circuit, sampled voltage signal is converted to for being sampled to the electric current of drive control circuit output, and by the current signal of sampling, drive control circuit is used to drive target electric appliance；Delay circuit, for obtaining sampled voltage signal, and after delay time is set, sampled voltage signal is inputted to voltage comparator circuit；Voltage comparator circuit, for sampled voltage signal to be fed back into drive control circuit compared with reference voltage signal, and by comparative result, to realize the current control to target electric appliance.The utility model realizes direct current generator in startup and braking, and ductility limit system has not been received in setting delay time, can be started and be braked with high current.
Description
Technical field
It the utility model is related to motor drive current control technology field, more particularly to a kind of delaying current control device.
Background technology
Conversion equipment of the motor as most important electromechanical energy, its application the every field in economy and
Daily life, direct current generator are an important branch in motor, its have good startup and governor control characteristics and
Larger torque, therefore application field is also quite varied, such as the field such as finance, health care.
During the use of direct current generator, typically the operating current of direct current generator can all be detected, once detection
Exceed the rated current of direct current generator to operating current, will be controlled by devices such as motor drive ics reduces direct current generator
Operating current directly makes direct current generator be stopped.
But during the use of reality, direct current generator generally requires larger electricity during startup and braking
It stream, typically can all be more than the rated current of direct current generator, however, setting too high by rated current if this, can cause straight
Electronic device (such as field-effect transistor) in stream motor and drive circuit works long hours in overload state, easily burns
Ruin.
Utility model content
In view of this, the utility model provides a kind of delaying current control device, to solve in the prior art to straight
While stream motor is operated current sample and feedback control, the high current more than rated current can not be carried out to direct current generator
The technological deficiency for starting and braking.
The utility model embodiment provides a kind of delaying current control device, including：Current sampling circuit, delay circuit
And voltage comparator circuit；
The current sampling circuit, for being sampled to the sample rate current of drive control circuit output, and adopted described
Sample current signal is converted to sampled voltage signal, and the drive control circuit is used to drive target electric appliance；
The delay circuit, for obtaining the sampled voltage signal, and after delay time is set, by the sampling electricity
Pressure signal is inputted to the voltage comparator circuit；
The voltage comparator circuit, for the sampled voltage signal compared with reference voltage signal, and will to be compared
Relatively result feeds back to the drive control circuit, to realize the current control to the target electric appliance.
On the basis of said apparatus, it is preferred that the current sampling circuit, including：Current sampling resistor R1；
Wherein, the sample rate current output end of the first end of the current sampling resistor R1 and the drive control circuit, with
And the input of the delay circuit is connected；The second end ground connection of the current sampling resistor R1.
On the basis of said apparatus, it is preferred that the delay circuit, including：Time delay resistance R2 and delay capacitor C1；
Wherein, the first end of the time delay resistance R2 is connected with the output end of the current sampling circuit, the delay electricity
R2 the second end and the first end of the delay capacitor C1 are hindered, and the input of the voltage comparator circuit is connected；It is described to prolong
When electric capacity C1 the second end ground connection.
On the basis of said apparatus, it is preferred that the voltage comparator circuit includes：Voltage comparator, the first partial pressure
Resistance R3 and the second divider resistance R4；
The first end of the first divider resistance R3 is connected with power Vcc, the second end of the first divider resistance R3 with
The first end of the second divider resistance R4 and the input in the same direction of the voltage comparator are connected, the second partial pressure electricity
Hinder R4 the second end ground connection；
The reverse input end of the voltage comparator is connected with the output end of the delay circuit, the voltage comparator
Output end is connected with the drive control circuit.
On the basis of said apparatus, it is preferred that the target electric appliance includes：Three-phase DC motor；The driving control
Circuit processed includes：Field-effect transistor drive control circuit；
Wherein, the first output end of the field-effect transistor drive control circuit, the second output end and the 3rd output
The first input end with the three-phase DC motor, the second input and the 3rd input are connected respectively at end；
The sample rate current output end of the field-effect transistor drive control circuit and the input of the current sampling circuit
End is connected.
On the basis of said apparatus, it is preferred that the time frame of the delay time of the delay circuit is Millisecond.
On the basis of said apparatus, it is preferred that the current sampling resistor R1, the first divider resistance R3, institute
State the second divider resistance R4 and the power Vcc meets following corresponding relations：
Wherein：I volumes are the rated current of the target electric appliance.
On the basis of said apparatus, it is preferred that the three-phase DC motor is three-phase dc brush motor, or three-phase
DC brushless motor.
The utility model provides a kind of delaying current control device, by using current sampling circuit to drive control electricity
The sample rate current of road output is sampled, and sampled current signals are converted into sampled voltage signal, is obtained using delay circuit
Sampled voltage signal, and after delay time is set, sampled voltage signal is inputted to voltage comparator circuit, and use voltage
Sampled voltage signal is fed back to drive control circuit by comparison circuit compared with reference voltage signal, and by comparative result,
Solve in the prior art while current sample and feedback control is operated to direct current generator, direct current generator can not be entered
Row starts more than the high current of rated current and the technological deficiency of braking, realizes direct current generator in startup and braking, is setting
Determine not received ductility limit system in delay time, can start and brake with high current.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the required accompanying drawing used does one and simply introduced in description of the prior art, it should be apparent that, drawings in the following description are
Some embodiments of the utility model, for those of ordinary skill in the art, on the premise of not paying creative work,
Other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of structure chart for delaying current control device that the utility model embodiment one provides；
Fig. 2 a are a kind of structure charts for delaying current control device that the utility model embodiment two provides；
Fig. 2 b are a kind of knots of the delaying current control device for three-phase DC motor that the utility model embodiment two provides
Composition；
Work when Fig. 2 c are three-phase DC motor startup, normal work and the braking that the utility model embodiment two provides
Electric current.
Embodiment
Further to illustrate that the utility model is to reach the technological means and effect that predetermined purpose of utility model taken,
Below in conjunction with accompanying drawing and preferred embodiment, to according to the utility model proposes the embodiment of intelligent interaction flat board, knot
Structure, feature and its effect, describe in detail as after.
Embodiment one
Fig. 1 is a kind of structure chart for delaying current control device that the utility model embodiment one provides, in the present embodiment
The structure of delaying current control device specifically includes：Current sampling circuit 101, delay circuit 102 and voltage comparator circuit
103。
Current sampling circuit 101, the sample rate current for the output to drive control circuit 201 sample, and will adopt
Sample current signal is converted to sampled voltage signal, and drive control circuit 201 is used to drive target electric appliance 202.
In the present embodiment, current sampling circuit 101 specifically can including current sampling resistor etc., current sampling resistor
The magnitude of voltage and target electric appliance for the reference voltage signal that resistance can specifically input according to the in-phase input end of voltage comparator 103
202 load current value determines that the power parameter of current sampling resistor can specifically start according to the high current of target electric appliance 202
When current value and the resistance of current sampling resistor itself determine.
In the present embodiment, drive control circuit 201 is while to 202 output driving current of target electric appliance, can also be to
Current sampling circuit 101 exports identical sample rate current, so that current sampling circuit 101 is sampled.Wherein, drive control electricity
Road 201 can be typically FET drive control circuit etc., and target electric appliance 202 can be typically direct current generator etc..
Delay circuit 102, it is for obtaining sampled voltage signal, and after delay time is set, sampled voltage signal is defeated
Enter to voltage comparator circuit 103.
In the present embodiment, delay circuit 102 can specifically include time delay resistance and delay capacitor etc., the resistance of time delay resistance
Value and the capacitance of delay capacitor can specifically determine according to setting delay time.Delay circuit 102 can be typically that RC prolongs
When circuit etc..
Further, can be according to actual need when using RC delay circuits as delay circuit 102 in the present embodiment
The multistage delay of setting is asked, that is, multiple RC delay circuits can be connected, so that its overall delay time meets actual demand.
Voltage comparator circuit 103, for by sampled voltage signal compared with reference voltage signal, and by comparative result
Drive control circuit 201 is fed back to, to realize the current control to target electric appliance 202.
In the present embodiment, voltage comparator circuit 103 can specifically include voltage comparator, the first divider resistance and second
Divider resistance etc..Wherein, voltage comparator can be typically LM339 and LM393 etc..Wherein, the first divider resistance and second
The resistance ratio of divider resistance specifically can according to reference voltage signal magnitude of voltage and access the magnitude of voltage of power supply to determine.
In the present embodiment, when sampled voltage signal is more than reference voltage signal, voltage comparator circuit 103 exports
Comparative result is to drive control circuit 201, so that drive control circuit 201 reduces the driving current of target electric appliance 202 or makes mesh
Mark electrical equipment 202 is stopped；When sampled voltage signal is less than reference voltage signal, the output of voltage comparator circuit 103 is compared
As a result to drive control circuit 201, driven so that drive control circuit 201 continues to export to target electric appliance 202 according to standing state
Streaming current.
By the setting of the present embodiment, delay circuit 102 is added so that the sampled voltage letter of current sampling circuit 101
Number can be after setting delay time, then input to voltage comparator circuit 103, thus, it is possible to so that the work of direct current generator
Electric current setting delay time in limit by the rated current of its own, so as to realize the high current of direct current generator start and greatly
Electric current is braked.
Embodiment two
Fig. 2 a are a kind of structure chart for delaying current control device that the utility model embodiment two provides.Such as Fig. 2 a institutes
Show, the present embodiment is optimized based on above-described embodiment.
In the present embodiment, current sampling circuit 101 is specifically optimized for：Current sampling resistor R1, current sampling resistor
R1 first end is connected with the sample rate current output end of drive control circuit 201 and the input of delay circuit 102, electric current
Sampling resistor R1 the second end ground connection.
In the present embodiment, drive control circuit 201 export sample rate current by current sampling resistor R1 to, because
This, sampled voltage signal corresponding with sample rate current is produced in current sampling resistor R1 first end.
Further, in the present embodiment, delay circuit 102 is specifically optimized for：Time delay resistance R2 and delay capacitor C1,
Wherein, time delay resistance R2 first end is connected with the output end of current sampling circuit 101, time delay resistance R2 the second end and delay
Electric capacity C1 first end, and the input of voltage comparator circuit 103 are connected, delay capacitor C1 the second end ground connection.
Further, in the present embodiment, voltage comparator circuit 103 is specifically optimized for：Voltage comparator 1031,
One divider resistance R3 and the second divider resistance R4, the first divider resistance R3 first end are connected with power Vcc, the first partial pressure electricity
Resistance R3 the second end is connected with the second divider resistance R4 first end and the input in the same direction of voltage comparator 1031, and second
Divider resistance R4 the second end ground connection, the reverse input end of voltage comparator 1031 are connected with the output end of delay circuit 102,
The output end of voltage comparator 1031 is connected with drive control circuit 201.
In the present embodiment, partial pressure is carried out to power Vcc by the first divider resistance R3 and the second divider resistance R4, and will
Partial pressure result is that reference voltage signal is inputted to the in-phase input end of voltage comparator 1031.In general, the number of reference voltage
Value should be equal to or less than the product of the load current value of target electric appliance 202 and the resistance of current sampling resistor.Work as reference voltage
Numerical value when being equal to the product of the load current value of target electric appliance and the resistance of current sampling resistor, current sampling resistor R1, the
It should meet formula between one divider resistance R3, the second divider resistance R4 and power VccIn it is indicated
Relation, wherein, I volumes be target electric appliance rated current.Wherein, power Vcc can be typically+5V power supplys.
By the setting of the present embodiment, it is more electric specifically to optimize current sampling circuit 101, delay circuit 102 and voltage ratio
Road 103, the circuit structure after optimization is more succinct, and can conveniently realize the operating current of direct current generator when setting delay
It is interior not limited by the rated current of its own, and then high current can be taken to start and high current braking.
On the basis of above-described embodiment, as shown in Figure 2 b, target electric appliance is specifically optimized for：Three-phase DC motor；Will
Drive control circuit is specifically optimized for：Field-effect transistor drive control circuit, wherein, field-effect transistor drive control circuit
The first output end, the second output end and the 3rd output end respectively the first input end with three-phase DC motor, second input
End and the 3rd input are connected, the sample rate current output end of field-effect transistor drive control circuit and current sampling circuit
Input is connected.Three-phase DC motor is that relatively broad one kind is used in direct current generator, and it is straight that three-phase DC motor includes three-phase
Stream brush motor and three-phase direct-current brushless motor, both direct current generators are applied to the present embodiment and the various embodiments described above.Such as
Shown in Fig. 2 b, three-phase DC motor needs three tunnel driving currents to be driven simultaneously, therefore, field-effect transistor drive control electricity
Lu Yousan driving current output end and a sample rate current output end.Field-effect transistor drive control circuit can be specifically
Include the DC motor Driver chip of field effect transistor tube drive circuit, can also be by DC motor Driver chip and field effect
Answer what transistor driving chip formed, the present embodiment is not limited to this.Further, voltage comparator circuit 103 exports
Comparative result specifically can be as the enable signal of pulse width modulating signal, the enable signal and corresponding pulse width modulation
Signal can be as same and door input, and when enable signal is 0, pulse width modulating signal fails, field effect transistor
Tube drive circuit stops or reduced the driving current of output；When enable signal is 1, pulse width modulating signal is effective, field effect
Transistor driver circuit is answered to start or continue to output driving current.As shown in Figure 2 c, the figure on the left side is the big electricity of three-phase DC motor
Operating current when stream starts, operating current when middle figure is three-phase DC motor normal work, the figure on the right is three-phase
Operating current when direct current generator high current is braked, as can be seen that three-phase DC motor is in startup and braking from Fig. 2 c
The difference of operating current and operating current during normal work is larger, and sustainable a period of time, can be typically 50 milliseconds,
Operating current of the three-phase DC motor in startup and braking can be typically 5A or 6A etc., three-phase DC motor normal work
When operating current can be typically 2A etc..
On the basis of the various embodiments described above, the time frame of the delay time of delay circuit is specifically optimized for millisecond
Level.The benefit so set is：Both ensure that in delay time, electric current is unrestricted, can be started with high current, while shorter
The high current time, will not cause to cause field-effect transistor drive control circuit and motor burning.Those skilled in the art can
With understanding, the startup of direct current generator and braking time are general shorter, and the time for substantially starting and braking is Millisecond.
It is described above, only it is preferred embodiment of the present utility model, not the utility model is made any formal
Limitation, although the utility model is disclosed above with preferred embodiment, but be not limited to this utility model, it is any
Those skilled in the art, do not departing from the range of technical solutions of the utility model, when the technology using the disclosure above
Content makes a little change or is modified to the equivalent embodiment of equivalent variations, as long as being without departing from technical solutions of the utility model
Hold, any simple modification, equivalent change and modification made according to the technical essence of the utility model to above example, still
Belong in the range of technical solutions of the utility model.
Claims (8)
- A kind of 1. delaying current control device, it is characterised in that including：Current sampling circuit, delay circuit and voltage ratio compared with Circuit；The current sampling circuit, for being sampled to the sample rate current of drive control circuit output, and the sampling is electric Stream signal is converted to sampled voltage signal, and the drive control circuit is used to drive target electric appliance；The delay circuit, for obtaining the sampled voltage signal, and after delay time is set, the sampled voltage is believed Number input is to the voltage comparator circuit；The voltage comparator circuit, for compared with reference voltage signal, and the sampled voltage signal will to be compared into knot Fruit feeds back to the drive control circuit, to realize the current control to the target electric appliance.
- 2. device according to claim 1, it is characterised in that the current sampling circuit, including：Current sampling resistor R1；Wherein, the first end of the current sampling resistor R1 and the sample rate current output end of the drive control circuit, Yi Jisuo The input for stating delay circuit is connected；The second end ground connection of the current sampling resistor R1.
- 3. device according to claim 1, it is characterised in that the delay circuit, including：Time delay resistance R2 and delay electricity Hold C1；Wherein, the first end of the time delay resistance R2 is connected with the output end of the current sampling circuit, the time delay resistance R2 The second end and the delay capacitor C1 first end, and the input of the voltage comparator circuit is connected；The delay electricity Hold C1 the second end ground connection.
- 4. device according to claim 2, it is characterised in that the voltage comparator circuit includes：Voltage comparator, first Divider resistance R3 and the second divider resistance R4；The first end of the first divider resistance R3 is connected with power Vcc, the second end of the first divider resistance R3 with it is described Second divider resistance R4 first end and the input in the same direction of the voltage comparator are connected, the second divider resistance R4 The second end ground connection；The reverse input end of the voltage comparator is connected with the output end of the delay circuit, the output of the voltage comparator End is connected with the drive control circuit.
- 5. according to the device described in claim any one of 1-4, it is characterised in that the target electric appliance includes：Three-phase dc electricity Machine；The drive control circuit includes：Field-effect transistor drive control circuit；Wherein, the first output end of the field-effect transistor drive control circuit, the second output end and the 3rd output end point First input end, the second input and the 3rd input not with the three-phase DC motor are connected；The sample rate current output end of the field-effect transistor drive control circuit and the input phase of the current sampling circuit Even.
- 6. device according to claim 5, it is characterised in that the time frame of the delay time of the delay circuit is milli Second level.
- 7. device according to claim 4, it is characterised in that the current sampling resistor R1, first divider resistance R3, the second divider resistance R4 and the power Vcc meet following corresponding relations：Wherein：I volumes are the rated current of the target electric appliance.
- 8. device according to claim 5, it is characterised in that the three-phase DC motor is three-phase dc brush motor, Or three-phase direct-current brushless motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720305842.7U CN206712693U (en) | 2017-03-27 | 2017-03-27 | Delaying current control device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720305842.7U CN206712693U (en) | 2017-03-27 | 2017-03-27 | Delaying current control device |
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| CN206712693U true CN206712693U (en) | 2017-12-05 |
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| CN201720305842.7U Expired - Fee Related CN206712693U (en) | 2017-03-27 | 2017-03-27 | Delaying current control device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106788005A (en) * | 2017-03-27 | 2017-05-31 | 深圳怡化电脑股份有限公司 | Delaying current control device |
-
2017
- 2017-03-27 CN CN201720305842.7U patent/CN206712693U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106788005A (en) * | 2017-03-27 | 2017-05-31 | 深圳怡化电脑股份有限公司 | Delaying current control device |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171205 |