CN107894530A - Negative voltage detection circuit and motor driver - Google Patents
Negative voltage detection circuit and motor driver Download PDFInfo
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- CN107894530A CN107894530A CN201711430298.XA CN201711430298A CN107894530A CN 107894530 A CN107894530 A CN 107894530A CN 201711430298 A CN201711430298 A CN 201711430298A CN 107894530 A CN107894530 A CN 107894530A
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- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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Abstract
The present invention discloses a kind of negative voltage detection circuit and motor driver, the negative voltage detection circuit includes current mirror circuit, negative voltage sampling comparison circuit, signal transformation circuit, sampled signal input and sampled signal output end, wherein, current mirror circuit samples the current offset current mirror of access to negative voltage the controlled end of comparison circuit, to drive negative voltage sampling comparison circuit work, and sample comparison circuit for negative voltage and reference current is provided；Negative voltage samples comparison circuit and sets predetermined voltage threshold according to reference current, and when the magnitude of voltage of the motor coil in access be less than predetermined voltage threshold, output negative voltage sampled signal；Signal transformation circuit triggers when receiving negative voltage sampled signal, and exports corresponding trigger signal to motor master control.The negative voltage signal that the present invention solves motor coil input is excessive and destruction is produced to the power switch pipe of its direct effect, or triggers latch-up, and caused high current causes whole power model to fail or the problem of damage.
Description
Technical field
The present invention relates to technical field of motors, more particularly to a kind of negative voltage detection circuit and motor driver.
Background technology
Industrial production and daily life are applied to more and more with the extension of social demand, motor with advances in technology
In.To ensure the operation to motor high efficient and reliable, it is desirable to which corresponding driving and control chip can be exactly to electric machine operation states
Detected and fed back.Due to the physical characteristic of device in integrated circuit and special manufacturing process, to the detection signal of input
There are corresponding electrical requirements.For example with H bridge type circuit drives motor, when motor was operated to the commutation stage, the power of H bridges is opened
Pass can simultaneously close off, and the coil both ends of H bridges can produce recoil negative voltage due to the now closing of power switch.For positive supply
The integrated circuit of power supply, this negative input voltage value can produce destruction to the power switch pipe of its direct effect, or trigger door bolt
Effect is locked, high current is produced, so as to cause whole chip failure or damage.
The content of the invention
The main object of the present invention is to propose a kind of negative voltage detection circuit and motor driver, it is intended to solves motor lines
The negative voltage signal of circle input is excessive and produces destruction to the power switch pipe of its direct effect, or triggers latch-up, generation
High current cause whole power model to fail or the problem of damage.
To achieve the above object, the present invention proposes a kind of negative voltage detection circuit, described applied in motor driver
Negative voltage detection circuit includes current mirror circuit, negative voltage sampling comparison circuit, signal transformation circuit, sampled signal input
And sampled signal output end, the first input end of the current mirror circuit and negative voltage sampling comparison circuit it is first defeated
Enter end and be respectively connected to driving power, the second input of the current mirror circuit is used to access current offset power supply, the electricity
The output end of traffic mirroring circuit is connected with the controlled end of negative voltage sampling comparison circuit；The negative voltage samples comparison circuit
The second input access motor coil through the sampled signal input, the output end of negative voltage sampling comparison circuit with
The input connection of the signal transformation circuit；The output end of the signal transformation circuit is through described in the sampled signal output end
Access motor master control；Wherein,
The current mirror circuit, for the current offset current mirror of access to negative voltage sampling to be compared
The controlled end of circuit, to drive the negative voltage sampling comparison circuit work, and sample comparison circuit for the negative voltage and provide
Reference current；
The negative voltage samples comparison circuit, for setting predetermined voltage threshold according to the reference current, and is accessing
The magnitude of voltage of motor coil when being less than the predetermined voltage threshold, export negtive voltage detection signal；
The signal transformation circuit, for being triggered when receiving the negtive voltage detection signal, and export corresponding touch
Signal to the motor master control.
Preferably, the current mirror circuit include first switch pipe, second switch pipe, the 3rd switching tube, described first
First conducting end of switching tube is the first input end of the current mirror circuit, and conductive with the first of the second switch pipe
End connection, the second conducting end of the first switch pipe are the second input of the current mirror circuit, and with described first
The controlled end of the controlled end of switching tube and the second switch pipe connects；Second conducting end of the second switch pipe and described the
The first conducting end and the controlled end interconnection of three switching tubes, the second conducting end ground connection of the 3rd switching tube.
Preferably, the current mirror circuit also includes first resistor, and the first resistor is arranged in series in the described 3rd
Between the second conducting end and ground of switching tube.
Preferably, the negative voltage sampling comparison circuit includes the sampling of multiple negative voltages and compares branch road, multiple negative electricity
Branch circuit parallel connection setting is compared in pressure sampling, and multiple negative voltage samplings compare the second input of branch road through multiple samplings
Multiple coils of signal input part and the motor connect one to one.
Preferably, branch road is compared in the negative voltage sampling includes the 4th switching tube and the 5th switching tube, the 4th switch
First conducting end of pipe is connected with the driving power, the second conducting end and the 5th switching tube of the 4th switching tube
First conducting end connects with the input of the signal transformation circuit, controlled end and the first switch of the 4th switching tube
The controlled end connection of pipe；The controlled end of 5th switching tube is connected with the controlled end of the 3rd switching tube, and the described 5th opens
The second conducting end for closing pipe compares the second input of branch road for negative voltage sampling.
Preferably, branch road is compared in the negative voltage sampling also includes second resistance, and the second resistance is arranged in series in institute
Between the second conduction terminal and the sampled signal input of stating the 5th switching tube.
Preferably, branch road is compared in negative voltage sampling also includes one-way conduction element, and the of the one-way conduction element
One end is connected with the sampled signal input, and the second end of the one-way conduction element is led with the second of the 5th switching tube
Electric end connection.
Preferably, the size of the first switch pipe, second switch pipe and the 4th switching tube is identical, three switch
Pipe is identical with the size of the 5th switching tube.
Preferably, the signal transformation circuit includes multiple phase inverters, and the quantity of multiple phase inverters correspond to it is multiple
The quantity that branch road is compared in the negative voltage sampling is set, and the input of multiple phase inverters is the defeated of the signal transformation circuit
Enter end, the output end of multiple phase inverters is the output end of the signal transformation circuit.
The present invention also proposes a kind of motor driver, including negative voltage detection circuit as described above, the negative voltage
Detecting circuit includes current mirror circuit, negative voltage sampling comparison circuit, signal transformation circuit, sampled signal input and sampling
The first input end point of signal output part, the first input end of the current mirror circuit and negative voltage sampling comparison circuit
Driving power is not accessed, and the second input of the current mirror circuit is used to access current offset power supply, the current mirror
The output end of circuit is connected with the controlled end of negative voltage sampling comparison circuit；The second of the negative voltage sampling comparison circuit
Input accesses motor coil, the output end of the negative voltage sampling comparison circuit and the letter through the sampled signal input
The input connection of number shaping circuit；The output end of the signal transformation circuit is through accessing electricity described in the sampled signal output end
Owner is controlled；Wherein, the current mirror circuit, for the current offset current mirror to the negative voltage of access to be sampled
The controlled end of comparison circuit, to drive the negative voltage sampling comparison circuit work, and comparison circuit is sampled for the negative voltage
Reference current is provided；The negative voltage samples comparison circuit, for setting predetermined voltage threshold according to the reference current, and
When the magnitude of voltage of the motor coil of access is more than the predetermined voltage threshold, negtive voltage detection signal is exported；The signal
Shaping circuit, for being triggered when receiving the negtive voltage detection signal, and corresponding trigger signal is exported to the motor
Master control.
The present invention is born by setting the current mirror circuit, and by the current offset current mirror of access to described
The controlled end of voltage sample comparison circuit, to drive the negative voltage sampling comparison circuit work, and sampled for the negative voltage
Comparison circuit provides reference current, so that negative voltage samples comparison circuit and sets predetermined voltage threshold according to the reference current,
And the magnitude of voltage of the motor coil in access exports negative voltage sampled signal when being less than the predetermined voltage threshold, so as to
So that signal transformation circuit triggers when receiving the negative voltage sampled signal, while the negative voltage sampled signal is carried out instead
Phase, so as to realize that signal is overturn, and then cause motor master control that when detecting effective detection signal, it is dynamic that protection is carried out to motor
Make.The negative voltage signal that the present invention solves motor coil input is excessive and the power switch pipe of its direct effect is produced broken
Bad, or trigger latch-up, caused high current causes whole power model to fail or the problem of damage.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Structure according to these accompanying drawings obtains other accompanying drawings.
Fig. 1 is the functional module signal that negative voltage detection circuit of the present invention is applied to an embodiment in motor driver
Figure；
Fig. 2 is the electrical block diagram of negative voltage detection circuit first embodiment of the present invention；
Fig. 3 is the electrical block diagram of negative voltage detection circuit second embodiment of the present invention；
Fig. 4 is the electrical block diagram of negative voltage detection circuit 3rd embodiment of the present invention；
Fig. 5 is the electrical block diagram of negative voltage detection circuit fourth embodiment of the present invention；
Fig. 6 is the electrical block diagram of the embodiment of negative voltage detection circuit the 5th of the present invention；
Fig. 7 is the electrical block diagram of negative voltage detection circuit sixth embodiment of the present invention.
Drawing reference numeral explanation：
| Label | Title | Label | Title |
| 10 | Current mirror circuit | 21 | Branch road is compared in the sampling of first negative voltage |
| 20 | Negative voltage samples comparison circuit | 22 | Branch road is compared in the sampling of second negative voltage |
| 30 | Signal transformation circuit | MPB0 | First switch pipe |
| 40 | One-way conduction element | MPB1 | Second switch pipe |
| R1 | First resistor | MNB1 | 3rd switching tube |
| R2 | Second resistance | MP1 | 4th switching tube |
| Q1 | Phase inverter | MN1 | 5th switching tube |
The realization, functional characteristics and advantage of the object of the invention will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only the part of the embodiment of the present invention, rather than whole embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art obtained under the premise of creative work is not made it is all its
His embodiment, belongs to the scope of protection of the invention.
If it is to be appreciated that related in the embodiment of the present invention directionality instruction (such as up, down, left, right, before and after ...),
Then directionality instruction be only used for explaining relative position relation under a certain particular pose (as shown in drawings) between each part,
Motion conditions etc., if the particular pose changes, directionality instruction also correspondingly changes therewith.
If in addition, relating to the description of " first ", " second " etc. in the embodiment of the present invention, " first ", " second " etc. are somebody's turn to do
Description be only used for describing purpose, and it is not intended that instruction or implying its relative importance or implicit indicating indicated skill
The quantity of art feature.Thus, " first " is defined, the feature of " second " can be expressed or implicitly includes at least one spy
Sign.In addition, the technical scheme between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
Based on enough realizations, the knot of this technical scheme is will be understood that when the combination appearance of technical scheme is conflicting or can not realize
Conjunction is not present, also not within the protection domain of application claims.
The present invention proposes a kind of negative voltage detection circuit, applied in motor driver.
The motor driver can be power model, and due to motor, in most cases its algorithm is substantially solid
Change, in order to save volume, improve antijamming capability, the peripheral electric-controlled plate design efforts would of mitigation, master controller can be integrated into one
On wiring board, power model is formed.Also,, in order to ensure that motor is capable of the operation of high efficient and reliable when power model works
Ask corresponding driving and control chip in power model electric machine operation state can be detected and fed back exactly.Due to power
The physical characteristic of device and special manufacturing process in module, there are corresponding electrical requirements to the detection signal of input.Such as
Power component is integrated in power model, to form in the case that H bridge type power driving circuit carrys out motor, transported in motor
When going to the commutation stage, the power switch of H bridges can simultaneously close off, and the coil both ends of H bridges can be due to the closing of now power switch
And produce recoil negative voltage.For the integrated circuit of positive supply power supply, this negative input voltage value can be to its direct effect
Power switch pipe produces destruction, or triggers latch-up, produces high current, so as to cause whole power model failure or damage.
In order to solve the above problems, reference picture 1, in an embodiment of the present invention, the negative voltage detection circuit include electric current
Mirror image circuit 10, negative voltage sampling comparison circuit 20, signal transformation circuit 30, sampled signal input IN and sampled signal output
Hold OUT, the first input end of the current mirror circuit 10 and negative voltage sampling comparison circuit 20 first input end point
Not Jie Ru driving power VDD, the second input of the current mirror circuit 10 is used to accessing current offset power supply Ibs, described
The output end of current mirror circuit 10 is connected with the controlled end of negative voltage sampling comparison circuit 20；The negative voltage samples ratio
The second input compared with circuit 20 accesses motor coil through the sampled signal input IN, and the negative voltage samples comparison circuit
20 output end is connected with the input of the signal transformation circuit 30；Adopted described in the output end warp of the signal transformation circuit 30
Sample signal output part OUT accesses motor master control；Wherein,
The current mirror circuit 10, for the current offset power supply Ibs mirror images to the negative voltage of access to be adopted
The controlled end of sample comparison circuit 20, to drive the negative voltage sampling comparison circuit 20 to work, and ratio is sampled for the negative voltage
Reference current is provided compared with circuit 20；
The negative voltage samples comparison circuit 20, for setting predetermined voltage threshold according to the reference current, and is connecing
When the magnitude of voltage of the motor coil entered is less than the predetermined voltage threshold, negtive voltage detection signal is exported；
The signal transformation circuit 30, for being triggered when receiving the negative voltage sampled signal, and export corresponding
Trigger signal is to the motor master control.
In the present embodiment, current offset power supply Ibs can be produced by current offset generation circuit, then input again to
Current mirror circuit 10, to provide current offset for current mirror circuit 10, and adopted by current mirror circuit 10 for negative voltage
Sample comparison circuit 20 provides a reference current.
The reference current that negative voltage sampling comparison circuit 20 provides according to current mirror circuit 10, and negative voltage sampling ratio
Predetermined voltage threshold Uth is set compared with the resistance between the second input and motor coil of circuit 20, the predetermined voltage threshold
It can specifically be determined according to formula (1):
Uth=-Ibs*R (1)
Wherein, Ibs is the reference current value that current mirror circuit 10 provides, and R is that negative voltage samples the of comparison circuit 20
Resistance value between two inputs and motor coil.
In the motor course of work, the voltage on the negative voltage sampling input sample motor coil of comparison circuit 20 second
Value, by the magnitude of voltage compared with presetting pre- voltage threshold, and corresponding level is exported in output end according to result of the comparison
To the input of signal transformation circuit 30, signal transformation circuit 30 carries out anti-phase output to the level to sampled signal output end
OUT, motor master control perform protection operation according to the level detected or cancel protection operation.
Specifically, for motor in normal work, the magnitude of voltage of motor coil is higher than predetermined threshold value, and negative voltage sampling is more electric
The output end on road 20 keeps high level, and the level that signal transformation circuit 30 feeds back to motor master signal test side is low level,
And low level signal will not trigger motor master control and perform protection operation；When negative voltage samples the second input of comparison circuit 20
Level dragged down by the negative voltage that motor coil inputs, and cause negative voltage sampling comparison circuit 20 output end be changed into low electricity
It is flat, now the low level negative voltage sampled signal by signal transformation circuit 30 it is anti-phase after, export to motor master control level i.e.
For high level, high level signal can trigger motor master control and perform corresponding safeguard measure.When the magnitude of voltage of the motor coil sampled
When returning to more than predetermined voltage threshold, negative voltage sampling comparison circuit 20 exports high level to signal transformation circuit 30, anti-phase
Signal output afterwards to the level of motor master control test side is low level, and motor master control stops performing corresponding protection, and motor recovers
Normal operating conditions.
The present invention is by setting the current mirror circuit 10, and by the current offset power supply Ibs mirror images of access extremely
The controlled end of the negative voltage sampling comparison circuit 20, to drive the negative voltage sampling comparison circuit 20 to work, and it is described
Negative voltage sampling comparison circuit 20 provides reference current, so that negative voltage samples comparison circuit 20 and set according to the reference current
Predetermined voltage threshold, and when the magnitude of voltage of the motor coil in access is less than the predetermined voltage threshold, export negative voltage
Sampled signal, so that signal transformation circuit 30 triggers when receiving the negative voltage sampled signal, while by the negative electricity
Press sampled signal to carry out anti-phase, so as to realize that signal is overturn, and then cause motor master control when detecting effective detection signal,
Protection act is carried out to motor.The present invention solve motor coil input negative voltage signal it is excessive and to the work(of its direct effect
The problem of rate switching tube produces destruction, or triggers latch-up, and caused high current causes whole power model to fail or damage.
It is understood that negative voltage detection circuit of the present invention can use discrete component to form independent circuit list
Member, the integrated chips such as wafer can also be sampled in power model, to reduce the area of automatically controlled pcb board, be advantageous to automatically controlled pcb board
Layout.
Referring to figs. 1 to Fig. 7, in a preferred embodiment, the current mirror circuit 10 includes first switch pipe MPB0, the
Two switching tube MPB1, the 3rd switching tube MNB1, the first conducting end of the first switch pipe MPB0 is the current mirror circuit
10 first input end, and be connected with the first conducting end of the second switch pipe MPB1, the of the first switch pipe MPB0
Two conducting ends are the second input of the current mirror circuit 10, and with the controlled end of the first switch pipe MPB0 and described
Second switch pipe MPB1 controlled end connection；The second conducting end of the second switch pipe MPB1 and the 3rd switching tube MNB1
The first conducting end and controlled end interconnection, the 3rd switching tube MNB1 the second conducting end ground connection.
In the present embodiment, first switch pipe MPB0, second switch pipe MPB1, the 3rd switching tube MNB1 can use metal-oxide-semiconductor,
Triode, or the electronic switch such as IGBT realize, the present embodiment is preferably metal-oxide-semiconductor to realize, and first switch pipe MPB0,
Second switch pipe MPB1 manages for P-MOS, and the 3rd switching tube MNB1 manages for N-MOS.By first switch pipe MPB0, second switch pipe
The current mirror circuit 10 of MPB1, the 3rd switching tube MNB1 composition is by the current mirror that current offset power supply Ibs is inputted to negative electricity
Pressure sampling comparison circuit 20.Wherein, the electric current for flowing through first switch pipe MPB0 is equal to the electric current for flowing through second switch pipe MPB1,
Equal to the electric current for flowing through the 3rd switching tube MNB1.Pass through first switch pipe MPB0, second switch pipe MPB1, the 3rd switching tube MNB1
The current mirror circuit 10 of composition drives negative voltage sampling comparison circuit 20 to work, and flows through negative voltage sampling and compare electric current
Electric current is equal to the electric current for flowing through current mirror circuit 10, provides a bias current so as to sample comparison circuit 20 for negative voltage, i.e.,
Reference current.
Reference picture 2 is to Fig. 7, and in a preferred embodiment, branch is compared in the negative voltage sampling of negative voltage sampling comparison circuit 20
Road can be one or multiple.Fig. 1 shows that negative voltage sampling comparison circuit 20 includes a negative voltage sampling and compared
The embodiment of branch road.Fig. 2 to Fig. 4 shows that negative voltage sampling comparison circuit 20 includes the reality that branch road is compared in two negative voltage samplings
Apply example.Fig. 5 and Fig. 6 shows that the negative voltage sampling comparison circuit 20 includes the embodiment that branch road is compared in the sampling of N number of negative voltage,
Wherein, N is more than or equal to 3.
Branch circuit parallel connection setting, and multiple negative voltage samplings are compared in reference picture 5 and Fig. 6, multiple negative voltage samplings
Compare multiple coils of the second input of branch road through multiple sampled signal input IN and the motor and correspond company
Connect.
In the present embodiment, multiple negative voltage samplings are provided with negative voltage sampling comparison circuit 20 and compare branch road, negative voltage
The quantity that branch road is compared in sampling can be set according to the quantity of motor coil, while can also be set according to the quantity of motor
It is fixed, such as in monophase machine, the number of coils of one-way motors is one, corresponding to the quantity of now negative voltage sampling branch road
For one.In three phase electric machine, the quantity of three phase electric machine coil is three, corresponding to the quantity of now negative voltage sampling branch road
For three, and in same three phase electric machine, the predetermined voltage threshold of negative voltage sampling comparison circuit 20 is also identical, can be according to upper
Formula (1) is stated to set.It is corresponding when negative voltage detection circuit is applied in the driving equipments such as the driving of four axles, the driving of six axles
Also to be multiple, now negative voltage sampling compares branch road and corresponds to multiple motors and the total coil of multiple motors for number of coils in motor
Quantity set, and the predetermined voltage threshold of negative voltage sampling comparison circuit 20 according to parameters such as the models of different motors, types and
It is fixed, it can specifically be set according to above-mentioned formula (1), be not limited herein.Negative voltage samples the second input pair for comparing branch road
Answer connecting motor coil, and the voltage of sample motor coil.
It is understood that the quantity of branch road, the number of the output end of current mirror circuit 10 are compared in corresponding negative voltage sampling
Amount is also multiple, the equal control signal of the output multi-channel current value of current mirror circuit 10, so as to control each negative voltage sampling ratio
Worked compared with branch road, while compare branch road for the sampling of each negative voltage and provide a current value equal reference current, sampled with realizing
After negative voltage signal on to motor coil, accurately the individual negative voltage signal can be compared, so as to improve negative voltage
Detect the precision of circuit.
For reference picture 2 to Fig. 4, Fig. 2 to Fig. 4 shows that there is negative voltage sampling comparison circuit 20 sampling of two-way negative voltage to compare
The embodiment of branch road, and the sampling of respectively the first negative voltage compares the sampling of the negative voltage of branch road 21 and second and compares branch road 22.Specifically
Ground, branch road 21 is compared in the sampling of the first negative voltage includes the 4th switching tube MP1 and the 5th switching tube MN1, the 4th switching tube MP1
The first conducting end be connected with the driving power VDD, the second conducting end of the 4th switching tube MP1 with the described 5th switch
Pipe MN1 the first conducting end connects with the input of the signal transformation circuit 30, the controlled end of the 4th switching tube MP1 with
The controlled end connection of the first switch pipe MPB0；The controlled end of the 5th switching tube MN1 and the 3rd switching tube MNB1
Controlled end connection, the second conducting end of the 5th switching tube MN1 compares the second input of branch road for negative voltage sampling
End.
In the present embodiment, the 4th switching tube MP1 and the 5th switching tube MN1 can use metal-oxide-semiconductor, triode, or IGBT
Realized Deng electronic switch, the present embodiment is preferably metal-oxide-semiconductor to realize, and the 4th switching tube MP1 is P-MOS pipes, and the 5th opens
Pipe MN1 is closed to manage for N-MOS.Wherein, the source electrode of P-MOS pipes be the 4th switching tube MP1 the first conducting end, the drain electrode of P-MOS pipes
For the 4th switching tube MP1 the second conducting end, the grid of P-MOS pipes is the 4th switching tube MP1 controlled end.The leakage of N-MOS pipes
Extremely the 5th switching tube MN1 the first conducting end, the source electrodes of N-MOS pipes are the 5th switching tube MN1 the second conducting end, N-MOS
The grid of pipe is the 5th switching tube MN1 controlled end.
In the present embodiment, when motor normal work, the 5th switching tube MN1 source voltage is more than the 3rd switching tube MNB1
Corresponding N-MOS pipes source voltage, so as to which the 5th switching tube MN1 is in cut-off state, negative voltage sampling comparison circuit 20 exports
High level signal, after signal transformation circuit 30 is anti-phase, it is low level to export to the level of motor master control, and the low level is not touched
The protection operation of generator master control.When under appearance recoil negative voltage, the magnitude of voltage of the motor coil terminated because sampled signal is defeated
Drop, the 5th switching tube MN1 source voltage also accordingly decline；And the negative voltage signal that recoils is excessive causes the defeated end IN of sampled signal to connect
When the negative value of the motor coil entered is less than predetermined voltage threshold, the source voltage of the 5th switching tube MN1 it is too low so that
5th switching tube MN1 is begun to turn on, and the 5th switching tube MN1 drain voltage step-downs, i.e. negative voltage sampling comparison circuit 20 export low
Level signal, the low level negative voltage sampled signal by signal transformation circuit 30 it is anti-phase after, export to the level of motor master control
As high level, after the signal of the upset reaches the test side of motor master control, the corresponding protection operation of triggering motor master control.
Further, branch road is compared in the negative voltage sampling also includes second resistance R2, and the second resistance R2 series connection is set
It is placed between the second conduction terminal and the sampled signal input IN of the 5th switching tube MN1.
It is understood that the bias current that the present embodiment exports in current mirror circuit 10, namely reference current are certain
When, understood according to above-mentioned formula (1), the magnitude of voltage of the i.e. adjustable predetermined voltage threshold of the resistance by adjusting second resistance R2.
And when branch road is compared in negative voltage sampling is arranged to multiple, pass through resistance i.e. achievable pair of second resistance R2 corresponding to regulation
The adjustment of branch road predetermined voltage threshold is compared in corresponding negative voltage sampling.Wherein, second in branch road is compared in each negative voltage sampling
Resistance R2 resistance can be with identical, can also be different, is not limited herein.
In above-described embodiment, the current mirror circuit 10 also includes first resistor R1, and the first resistor R1 series connection is set
It is placed between the second conducting end and the ground of the 3rd switching tube MNB1.
In the present embodiment, first resistor R1 and second resistance R2 are arranged in parallel, and can be raised by adjusting first resistor R1
5th switching tube MN1 drain voltage values, be advantageous to further improve the sampling precision that negative voltage samples comparison circuit 20, such as when
Sampled signal input IN magnitude of voltage is 0V, 0.01V or during close to 0V, and negative voltage sampling comparison circuit 20 can obtain
The signal is negative voltage sampled signal, so as to which trigger signal shaping circuit 30 is overturn, improves the protection speed of negative voltage detection circuit
Degree.
It is understood that what negative voltage detection circuit of the present invention was only formed with switching tubes such as simple triode, metal-oxide-semiconductors
Negative voltage sampling comparison circuit realizes the sampling to the motor coil negative voltage of input and compared, no to need independent voltage
Comparator, the detection function to negative voltage is achieved that, and need to only increase a P-MOS transistor, a N-MOS pipe and one
Individual resistance can expand sampling channel all the way, be effectively simplified design, reduce the production cost of integrated circuit.
It should be noted that because branch road 21 compared with branch road 22 samples with the first negative voltage is compared in the sampling of the second negative voltage
Structure is identical, therefore operation principle is identical and the technique effect that reaches is also identical, specifically can refer to the sampling of the first negative voltage and compares branch
Road 21, will not be repeated here.
Referring to figs. 1 to Fig. 7 in a preferred embodiment, branch road is compared in the negative voltage sampling also includes one-way conduction element
40, the first end of the one-way conduction element 40 is connected with the sampled signal input IN, the one-way conduction element 40
Second end is connected with the second conducting end of the 5th switching tube MN1.
In the present embodiment, one-way conduction element 40 is diode, according to the one-way conduction of diode, when sampled signal is defeated
The polarity of voltage for entering to hold IN to input is timing, and diode is not turned on, and the voltage for working as sampled signal input IN inputs is negative, or
When person reaches the conduction threshold of diode, diode current flow is so that negative voltage sampled signal is exported to signal shaping through switching tube
The input of circuit 30.The present embodiment can be avoided in motor normal work, voltage pours in down a chimney to negative electricity by setting diode
Pressure sampling comparison circuit 20, and influence the negative voltage sampling normal work of comparison circuit 20.
Referring to figs. 1 to Fig. 7, in above-described embodiment, the first switch pipe MPB0, second switch pipe MPB1 and the described 4th
Switching tube MP1 size is identical, and three switching tube is identical with the size of the 5th switching tube MN1.
It is understood that when above-mentioned each switching tube samples metal-oxide-semiconductor to realize, the first switch pipe MPB0,
Two switching tube MPB1 and the 4th switching tube MP1 are P-MOS pipes, and the size of each P-MOS pipes is identical, three switching tube
It is N-MOS pipes with the 5th switching tube MN1, and size is identical.It is arranged such so that switching tube is operated in saturation state
When, the running parameter all same of each switching tube, so as to avoid reason from influenceing sampling precision in the reason for switching tube itself, be advantageous to
Further improve the sensitivity of the negtive voltage detection of negative voltage detection circuit.
Referring to figs. 1 to Fig. 7, in a preferred embodiment, the signal transformation circuit 30 includes multiple phase inverters, and (figure is not marked
Show), and the quantity of multiple phase inverters corresponds to the quantity that branch road is compared in multiple negative voltage samplings and set, it is multiple described anti-
Phase device Q1 input is the input of the signal transformation circuit 30, and multiple phase inverter Q1 output end is the signal
The output end of shaping circuit 30.As shown in Fig. 2 Fig. 2 shows the corresponding negative voltage sampling comparison circuit 20 of signal transformation circuit 30
Two negative voltages are set to sample the embodiment for comparing branch road, signal transformation circuit 30 includes two phase inverter Q1 and is designated as the respectively
One phase inverter Q1 and the second phase inverter Q2.
In the present embodiment, signal transformation circuit 30 is preferably realized using phase inverter Q1, and more electric in negative voltage sampling
Road 20 is triggered when the negative voltage sampled signal for detecting sampled signal input IN inputs is less than predetermined voltage threshold, so as to defeated
Go out the trigger signal of high level to motor master control, so that electric motor protecting action is made in motor master control.
Referring to figs. 1 to Fig. 7, certainly in other embodiments, corresponding negative voltage compares the quantity of branch road, the 4th switching tube
MP1 quantity and the 5th switching tube MN1 quantity could be arranged to multiple, and accordingly, multiple 4th switching tubes are remembered respectively
For MP1, MP2 ..., MPN；5th switching tube be designated as respectively MN1, MN2 ..., MNN.Multiple sampled signal input difference
It is designated as IN1, IN2 ..., IN；Multiple diodes be designated as respectively D1, D2 ..., DN；Multiple second resistance R2 be designated as respectively R21,
R22……、R2N；Multiple phase inverters be designated as respectively Q1, Q2 ..., QN；Multiple sampled signal output ends be designated as respectively OUT1,
OUT2……、OUTN。
The present invention also proposes a kind of motor driver, and the motor driver includes negtive voltage detection as described above
Circuit.The detailed construction of the negative voltage detection circuit can refer to above-described embodiment, and here is omitted；It is understood that by
In having used above-mentioned negative voltage detection circuit in motor driver of the present invention, therefore, the reality of motor driver of the present invention
Applying example includes whole technical schemes of above-mentioned negative voltage detection circuit whole embodiments, and the technique effect reached also complete phase
Together, will not be repeated here.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the scope of the invention, it is every at this
Under the inventive concept of invention, the equivalent structure transformation made using description of the invention and accompanying drawing content, or directly/use indirectly
It is included in other related technical areas in the scope of patent protection of the present invention.
Claims (10)
- A kind of 1. negative voltage detection circuit, applied in motor driver, it is characterised in that the negative voltage detection circuit bag Include current mirror circuit, negative voltage sampling comparison circuit, signal transformation circuit, sampled signal input and sampled signal output The first input end of end, the first input end of the current mirror circuit and negative voltage sampling comparison circuit is respectively connected to drive Dynamic power supply, the second input of the current mirror circuit are used to accessing current offset power supply, the current mirror circuit it is defeated The controlled end for going out end with negative voltage sampling comparison circuit is connected；The second input warp of the negative voltage sampling comparison circuit The sampled signal input accesses motor coil, output end and the signal shaping electricity of the negative voltage sampling comparison circuit The input connection on road；The output end of the signal transformation circuit is through accessing motor master control described in the sampled signal output end； Wherein,The current mirror circuit, for the current offset current mirror of access to the negative voltage to be sampled into comparison circuit Controlled end, to drive negative voltage sampling comparison circuit work, and benchmark is provided for negative voltage sampling comparison circuit Electric current；The negative voltage samples comparison circuit, for setting predetermined voltage threshold according to the reference current, and in the institute of access When stating the magnitude of voltage of motor coil and being less than the predetermined voltage threshold, negtive voltage detection signal is exported；The signal transformation circuit, for being triggered when receiving the negtive voltage detection signal, and export corresponding triggering letter Number to the motor master control.
- 2. negative voltage detection circuit as claimed in claim 1, it is characterised in that the current mirror circuit includes first switch Pipe, second switch pipe, the 3rd switching tube, the first conducting end of the first switch pipe are first defeated for the current mirror circuit Enter end, and be connected with the first conducting end of the second switch pipe, the second conducting end of the first switch pipe is the electric current Second input of mirror image circuit, and be connected with the controlled end of the controlled end of the first switch pipe and the second switch pipe； Second conducting end of the second switch pipe and the first conducting end and controlled end of the 3rd switching tube interconnect, and the described 3rd opens Close the second conducting end ground connection of pipe.
- 3. negative voltage detection circuit as claimed in claim 2, it is characterised in that the current mirror circuit also includes the first electricity Resistance, the first resistor are arranged in series between the second conducting end of the 3rd switching tube and ground.
- 4. negative voltage detection circuit as claimed in claim 2, it is characterised in that the negative voltage sampling comparison circuit includes more Branch road is compared in individual negative voltage sampling, and branch circuit parallel connection setting, and multiple negative voltage samplings are compared in multiple negative voltage samplings The second input for comparing branch road connects one to one through multiple sampled signal inputs and multiple coils of the motor.
- 5. negative voltage detection circuit as claimed in claim 4, it is characterised in that branch road is compared in negative voltage sampling includes the Four switching tubes and the 5th switching tube, the first conducting end of the 4th switching tube are connected with the driving power, and the described 4th opens The second conducting end for closing pipe is connected with the first conducting end of the 5th switching tube and the input of the signal transformation circuit, institute The controlled end for stating the 4th switching tube is connected with the controlled end of the first switch pipe；The controlled end of 5th switching tube with it is described The controlled end connection of 3rd switching tube, the second conducting end of the 5th switching tube compare the of branch road for negative voltage sampling Two inputs.
- 6. negative voltage detection circuit as claimed in claim 5, it is characterised in that branch road is compared in the negative voltage sampling also to be included Second resistance, the second resistance are arranged in series the second conduction terminal and the sampled signal input in the 5th switching tube Between.
- 7. negative voltage detection circuit as claimed in claim 5, it is characterised in that branch road is compared in the negative voltage sampling also to be included One-way conduction element, the first end of the one-way conduction element are connected with the sampled signal input, the one-way conduction member Second end of part is connected with the second conducting end of the 5th switching tube.
- 8. the negative voltage detection circuit as described in right wants 5 to 7 any one, it is characterised in that the first switch pipe, second The size of switching tube and the 4th switching tube is identical, and three switching tube is identical with the size of the 5th switching tube.
- 9. negative voltage detection circuit as claimed in claim 4, it is characterised in that the signal transformation circuit includes multiple anti-phase Device, and the quantity of multiple phase inverters corresponds to the quantity that branch road is compared in multiple negative voltage samplings and set, it is multiple described anti- The input of phase device is the input of the signal transformation circuit, and the output end of multiple phase inverters is signal shaping electricity The output end on road.
- 10. a kind of motor driver, it is characterised in that including the negtive voltage detection as described in claim 1 to 9 any one Circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711430298.XA CN107894530A (en) | 2017-12-25 | 2017-12-25 | Negative voltage detection circuit and motor driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711430298.XA CN107894530A (en) | 2017-12-25 | 2017-12-25 | Negative voltage detection circuit and motor driver |
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| Publication Number | Publication Date |
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| CN107894530A true CN107894530A (en) | 2018-04-10 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711430298.XA Pending CN107894530A (en) | 2017-12-25 | 2017-12-25 | Negative voltage detection circuit and motor driver |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112014623A (en) * | 2020-09-01 | 2020-12-01 | 上海艾为电子技术股份有限公司 | Current sampling circuit and power supply converter |
| CN114062765A (en) * | 2021-11-18 | 2022-02-18 | 上海南芯半导体科技股份有限公司 | Low-power consumption high accuracy voltage detection circuit |
| CN114326867A (en) * | 2021-12-30 | 2022-04-12 | 广东美的白色家电技术创新中心有限公司 | Direct current load drive circuit, heating assembly and electrical equipment |
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| CN114326867A (en) * | 2021-12-30 | 2022-04-12 | 广东美的白色家电技术创新中心有限公司 | Direct current load drive circuit, heating assembly and electrical equipment |
| CN114326867B (en) * | 2021-12-30 | 2023-04-11 | 广东美的白色家电技术创新中心有限公司 | Direct current load drive circuit, heating assembly and electrical equipment |
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