CN207053426U

CN207053426U - A kind of safety protective circuit of clockwise and anticlockwise motor circuit

Info

Publication number: CN207053426U
Application number: CN201621404371.7U
Authority: CN
Inventors: 赵启纯
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-12-21
Filing date: 2016-12-21
Publication date: 2018-02-27
Anticipated expiration: 2026-12-21

Abstract

A kind of safety protective circuit for the clockwise and anticlockwise motor circuit that the utility model is related to, the logic processing circuit is by first and door, nor gate, second and door, and the 3rd and door composition, first is provided with two with the input of door, respectively rotate forward signal input part and reverse signal input, first is connected an input of nor gate with the output end of door, second is provided with two inputs with door, one input connects nor gate output end, the connection of another input rotates forward signal input part, 3rd also is provided with two inputs with door, one input connects nor gate output end, another input connects reverse signal input, second is connected with the input of motor-drive circuit respectively with the output end of door with the 3rd with the output end of door.

Description

A kind of safety protective circuit of clockwise and anticlockwise motor circuit

Technical field

Motor-drive circuit field is the utility model is related to, more particularly to a kind of safeguard protection of clockwise and anticlockwise motor circuit Circuit.

Background technology

In the positive circnit NOT of motor controlled using transistor AND gate FET, over current of motor overload often occurs and burns Bad driving tube and the phenomenon for burning pcb circuit boards, particularly in the exploitation of positive and negative control circuit and the primary stage of debugging control, Or because software debugging is improper improper with hardware circuit parameter designing, it is easier to burn out rotating drive circuit.

Therefore, it is necessary to a kind of new clockwise and anticlockwise motor circuit is designed, to overcome above mentioned problem.

Utility model content

For background technology problem encountered, the purpose of this utility model is to provide a kind of clockwise and anticlockwise motor circuit Safety protective circuit, it is formed by logic processing circuit, motor-drive circuit, with current detection circuit.Work as logic processing circuit And the signal end of current detection circuit all completely it is correct when, output signal to the motor-drive circuit, complete the positive and negative of motor Conversion, when there is a signal incorrect in the signal end of logic processing circuit and motor-drive circuit, the clockwise and anticlockwise motor electricity The safety protective circuit shut-off output on road, so as to solve the primary stage of the exploitation of positive and negative control circuit and debugging control, or Because software debugging is improper improper with hardware circuit parameter designing, the problem of easily burning out rotating drive circuit.

To achieve the above object, the utility model uses following technological means：A kind of safety guarantor of clockwise and anticlockwise motor circuit Protection circuit, it includes：One logic processing circuit；One motor-drive circuit, the input of the motor-drive circuit are patrolled with described The output end connection of process circuit is collected, the output end of the motor-drive circuit is used for and a motor connection；One current detecting electricity Road, for detecting the current strength of the motor-drive circuit, described current detection circuit one end and the motor-drive circuit Connection, the other end are connected with the input of the logic processing circuit；The logic processing circuit by first with door, nor gate, Second forms with door and the 3rd with door, and described first is provided with two with the input of door, respectively rotates forward signal input part and anti- Rotaring signal input, described first is connected an input of the nor gate with the output end of door, and described second is provided with door Two inputs, an input connect the nor gate output end, and another input connects the rotating forward signal input part, Described 3rd also is provided with two inputs with door, and an input connects the nor gate output end, the connection of another input The reverse signal input, described second drives with the motor respectively with the output end of door with the described 3rd with the output end of door The input connection of dynamic circuit.

As the further improvement of such scheme, including the motor-drive circuit includes one first circuit portion, and described One circuit portion is provided with first FET, second FET and a transistor, described second with door Output end is connected by a first resistor of connecting with the base stage of the transistor, and the grid of first FET passes through One second resistance is connected with the colelctor electrode of the transistor, and the source electrode of first FET is used to connect with a power supply Connect.The grid of second FET is connected by a 3rd resistor of connecting with the described 3rd with the output end of door, and described the The source electrode of two FETs is connected with the current detection circuit, the drain electrode of second FET and first field-effect Pipe drain electrode connection, second FET drain electrode and first FET drain electrode all with the first circuit portion Output end connection.The motor-drive circuit includes a second circuit portion, the second circuit portion and the first circuit portion It is in parallel.The second circuit portion includes the 3rd FET, the 4th FET and a transistor, described The base stage of transistor is connected by one the 4th resistance of connecting with the described 3rd with the output end of door, the transistor Colelctor electrode is connected by one the 5th resistance with the grid of the 3rd FET.The grid of 4th FET passes through string Join one the 6th resistance to be connected with described second with the output end of door, source electrode and the current detecting electricity of the 4th FET Road connects, and the drain electrode of the 4th FET is connected with the drain electrode of the 3rd FET, and all with the second circuit The output end connection in portion.The model of first FET and the model of the 3rd FET are all SUD19P06- The model of 60L, the model of second FET and the 4th FET is all SUD23N6-31L.First electricity The resistance of resistance and the resistance of the 4th resistance are all 2K ohms, the resistance of the second resistance and the resistance of the 5th resistance All it is 4.7K ohms, the resistance of the resistance of the 3rd resistor and the 6th resistance is all 1K ohms.The current detecting electricity Road includes a linear Hall current sensor, and the Hall current sensor is provided with an input and is used for and second field-effect The source electrode of the source electrode of pipe and the 4th FET connects.The model ACS712-20 of the Hall current sensor.

Compared with prior art, the logic processing circuit of the present utility model by first with door, nor gate, second with Door and the 3rd formed with door, described first is provided with two with the input of door, respectively rotates forward signal input part and reverse signal Input, described first is connected an input of the nor gate with the output end of door, and described second is defeated provided with two with door Entering end, input connects the nor gate output end, and another input connects the rotating forward signal input part, and described the Three also are provided with two inputs with door, and an input connects the nor gate output end, and the connection of another input is described anti- Rotaring signal input, described second with the output end of door with the described 3rd with the output end of door respectively with the motor-drive circuit Input connection；The input of the other end of the current detection circuit and the logic processing circuit is connected as control letter Number, when control signal or positive and negative rotaring signal are muddled things up, the logic processing circuit output signal is zero so that the motor drives Dynamic circuit input is zero, so as to serve the effect of protection motor.

Brief description of the drawings

Fig. 1 is the theory diagram of logic processing circuit of the present utility model；

Fig. 2 is the theory diagram of motor-drive circuit of the present utility model；

Fig. 3 is the theory diagram of current detection circuit of the present utility model.

Embodiment

In order to further illustrate the effect of technological means that the utility model taken and acquirement, below in conjunction with the accompanying drawings and Preferred embodiment, to the technical solution of the utility model, carry out clear and complete description.

As shown in Figure 1 to Figure 3, the safety protective circuit of clockwise and anticlockwise motor circuit of the present utility model, it includes：One logic Process circuit, a motor-drive circuit, the output end of the input of the motor-drive circuit and the logic processing circuit connect Connect, the output end of the motor-drive circuit is used for and a motor connection.One current detection circuit, driven for detecting the motor The current strength of dynamic circuit, described current detection circuit one end are connected with the motor-drive circuit, the other end and the logic The input connection of process circuit.

As shown in Figure 1 to Figure 3, the logic processing circuit is by first and door U2-A, nor gate U1-A, second and door U2-B And the 3rd and door U2-C is formed.Described first is provided with two with door U2-A input, respectively rotates forward signal input part and anti- Rotaring signal input.The nor gate U1-A is connected with described first with door U2-A, and described first and door U2-A output end connects Connect an input of the nor gate U1-A.The output end of the nor gate U1-A is connected with described second with door U2-B, institute State second and be provided with two inputs with door U2-B, an input connects the nor gate U1-A output ends, another input Connect the rotating forward signal input part.Described 3rd also is provided with two inputs with door U2-C, an input connection it is described or NOT gate U1-A output end, another input connect the reverse signal input, described second and door U2-B output end A1 is connected with the described 3rd with inputs of the door U2-C output end B1 respectively with the motor-drive circuit.

As shown in Figure 1 to Figure 3, the motor-drive circuit includes one first circuit portion, and the first circuit portion is provided with one Individual first FET Q1, a second FET Q3 and a transistor, described second and door U2-B output end A1 is connected by the first resistor R4 that connects with the base stage of the transistor, and the grid of the first FET Q1 passes through One second resistance R5 is connected with the collector of the transistor, and the source electrode of the first FET Q1 is used to connect with a power supply Connect.The output end B1 that the grid of the second FET Q3 passes through connect a 3rd resistor R3 and the described 3rd and door U2-C Connection, the source electrode of the second FET Q3 are connected with the current detection circuit, the drain electrode of the second FET Q3 Drain electrode with the first FET Q1 is connected, and the drain electrode of the second FET Q3 is with the first FET Q1's The output end OUT2 with the first circuit portion that drains is connected.

As shown in Figure 1 to Figure 3, the motor-drive circuit includes a second circuit portion, the second circuit portion with it is described First circuit portion is in parallel.The second circuit portion includes a 3rd FET Q4, a 4th FET Q6 and one Transistor, the base stage of the transistor pass through the output for one the 4th resistance R8 and the described 3rd and door U2-C that connects B1 connections are held, the colelctor electrode of the transistor is connected by one the 5th resistance R9 and the 3rd FET Q4 grid Connect.The grid of the 4th FET Q6 is connected by one the 6th resistance R7 that connects with described second with door U2-B output terminals A 1 Connect, the source electrode of the 4th MOS field effect transistor Q6 is connected with the current detection circuit, the drain electrode of the 4th FET Q6 and institute The 3rd FET Q4 drain electrode connection is stated, and the output end OUT1 with the second circuit portion is connected.First effect Should pipe Q1 model and the model of the 3rd FET Q4 be all that (model can be according to motor by SUD19P06-60L Power current needs to change), the model of the second FET Q3 and the model of the 4th FET Q6 are all SUD23N6-31L (model can need to change according to the power current of motor).The resistance of the first resistor R4 with it is described 4th resistance R8 resistance is all 2K ohms, and the resistance of the second resistance R5 and the 5th resistance R9 resistance are all 4.7K Ohm, the resistance of the 3rd resistor R3 and the 6th resistance R7 resistance are all 1K ohms.The type of the transistor Number be 8050.

As shown in Figure 1 to Figure 3, the current detection circuit includes a linear Hall current sensor, the Hall current Sensor is provided with an input and is used to connect with the source electrode of the second FET Q3 and the 4th FET Q6 source electrode Connect.The model ACS712-20 of the Hall current sensor, the IP1 and IP2 of the Hall current sensor and described second The source electrode connection of FET Q3 source electrode, the 4th FET Q6.

When the safety protective circuit of the clockwise and anticlockwise motor circuit starts at the beginning, it is assumed that the rotating forward signal input part Represent that the motor rotates forward during input high level 1, during the reverse signal input input low level 0, now described positive transfering the letter Number signal of input and the signal of the reverse signal input belong to correct signal, then first with door U2-A output signal For low level 0, and the electric current of the current detection circuit is zero, then the input signal of the two of nor gate U1-A input is all Low level so that the nor gate U1-A output signals are high level；The signal of described second and door U2-B two inputs All it is high level, then described second and door U2-B output signal is high level；And the reverse signal input signal is low electricity Flat 0, then the described 3rd and door U2-C output signal is low level so that the 3rd FET Q4 and second effect Should pipe Q3 be not turned on, be 0 so as to the output end OUT1 outputs in now the first circuit portion.Described second and door U2-B output Signal is that high level causes the first FET Q1, turned on the first FET Q6, now the second circuit The output end OUT2 outputs in portion are 1 so that the output voltage (OUT2-OUT1) of the motor-drive circuit is described on the occasion of causing Motor rotates forward.The second circuit portion conducting causes the source electrode of the 4th FET Q6 to be sensed to the Hall current simultaneously Device input current, so that the current detection circuit exports high value, the high electricity value of current detection circuit output, warp U5 is converted into stable low level 0, into the input of the nor gate U1-A.And for example assume that the rotating forward signal input part is defeated The motor reversal is represented when entering low level 0, during the reverse signal input input high level 1, now described positive rotaring signal The signal of the signal of input and the reverse signal input belongs to correct signal, then first is with door U2-A output signal Low level 0, and the output level of the current detection circuit is zero, then the input signal of the two of nor gate U1-A input is all For low level so that the nor gate U1-A output signals are high level.The reverse signal input signal is high level 1, then Described 3rd and door U2-C output signal is high level so that the second FET Q3 and the 3rd FET Q4 is turned on, and is 1 so as to which now the output end OUT1 in the first circuit portion is exported.And described second and door U2-B output signal For low level so that the 4th FET Q6 is not turned on, so that the second circuit portion is not turned on, now described The output end OUT2 outputs in two circuit portions are 0 so that the output voltage (OUT2-OUT1) of the motor-drive circuit makes for negative value Obtain the motor reversal.I.e. described logic processing circuit can both realize the positive inverse transformation of power supply, can also realize motor just Reversion.When being U2-B output high level, Q1 conductings, Q6 conductings, current path being formed, OUT2 is+, OUT1 is-；Work as U2-C When exporting high level, Q4 conductings, Q3 conductings, current path being formed, OUT1 is+, OUT2 is-.

As shown in Figure 1 to Figure 3, current detection circuit state is：By adjusting R15, R16 ratio, in that case it can be decided that the electricity The current protection value on road, once circuit OUT1 exceedes setting value with OUT2 output currents, the protection circuit exports high level, normally It is output low level during work.

As shown in figure 3, in other embodiments, further comprising a phase inverter U5, the phase inverter is located at the electric current Between 7 pin and U1-A that detect the U4-B of circuit.

When the safety protective circuit of the clockwise and anticlockwise motor circuit starts at the beginning, it is assumed that the rotating forward signal input part During input high level 1, the reverse signal input also input high level 1 when, now it is described rotate forward signal input part signal And the signal of the reverse signal input belongs to error signal, then first high level is exported with door U2-A so that described or non- Door U1-A output low levels, so that described second and door U2-B and the described 3rd and door U2-C export low level, now The motor-drive circuit does not have signal input, then motor does not rotate, and the exploitation and debugging of positive and negative control circuit are avoided with this The primary stage of control, or because software debugging is improper improper with hardware circuit parameter designing, it is easier to burn out rotating driving electricity The problem of road.

Detailed description above is only the explanation of the preferred embodiment of the utility model, and non-therefore limitation is of the present utility model specially Sharp scope, so, all equivalence techniqueses with carried out by this creation specification and diagramatic content change, and are both contained in the utility model The scope of the claims in.

Claims

A kind of 1. safety protective circuit of clockwise and anticlockwise motor circuit, it is characterised in that including：

One logic processing circuit；

One motor-drive circuit, the input of the motor-drive circuit are connected with the output end of the logic processing circuit, institute The output end for stating motor-drive circuit is used for and a motor connection；

One current detection circuit, for detecting the current strength of the motor-drive circuit, described current detection circuit one end with The motor-drive circuit connection, the other end are connected with the input of the logic processing circuit；

The logic processing circuit is made up of first and door, nor gate, second with door and the 3rd with door, and described first is defeated with door Enter end and be provided with two, respectively rotate forward signal input part and reverse signal input, described first is connected institute with the output end of door An input of nor gate is stated, described second is provided with two inputs with door, and an input connects the nor gate output End, another input connect the rotating forward signal input part, and the described 3rd also is provided with two inputs, an input with door Connect the nor gate output end, another input connects the reverse signal input, described second with the output end of door It is connected with the described 3rd with input of the output end of door respectively with the motor-drive circuit.
A kind of 2. safety protective circuit of clockwise and anticlockwise motor circuit according to claim 1, it is characterised in that：The motor Drive circuit includes one first circuit portion, and the first circuit portion is provided with first FET, second FET And a transistor, described second passes through a first resistor and the base stage of the transistor of connecting with the output end of door Connection, the grid of first FET are connected by a second resistance with the collector of the transistor, and described first The source electrode of FET is used to be connected with a power supply.
A kind of 3. safety protective circuit of clockwise and anticlockwise motor circuit according to claim 2, it is characterised in that：Described second The grid of FET is connected by a 3rd resistor of connecting with the described 3rd with the output end of door, second FET Source electrode is connected with the current detection circuit, and the drain electrode of second FET connects with the drain electrode of first FET Connect, the output end of the drain electrode of second FET and the drain electrode of first FET all with the first circuit portion connects Connect.
A kind of 4. safety protective circuit of clockwise and anticlockwise motor circuit according to claim 3, it is characterised in that：The motor Drive circuit includes a second circuit portion, and the second circuit portion is in parallel with the first circuit portion.
A kind of 5. safety protective circuit of clockwise and anticlockwise motor circuit according to claim 4, it is characterised in that：Described second Circuit portion includes the 3rd FET, the 4th FET and a transistor, the transistor Base stage is connected by one the 4th resistance of connecting with the described 3rd with the output end of door, and the colelctor electrode of the transistor passes through one 5th resistance is connected with the grid of the 3rd FET.
A kind of 6. safety protective circuit of clockwise and anticlockwise motor circuit according to claim 5, it is characterised in that：Described 4th The grid of FET is connected by one the 6th resistance of connecting with described second with the output end of door, the 4th FET Source electrode is connected with the current detection circuit, and the drain electrode of the 4th FET connects with the drain electrode of the 3rd FET Connect, and the output end all with the second circuit portion is connected.
A kind of 7. safety protective circuit of clockwise and anticlockwise motor circuit according to claim 6, it is characterised in that：Described first The model of FET and the model of the 3rd FET are all SUD19P06-60L, the model of second FET Model with the 4th FET is all SUD23N6-31L.
A kind of 8. safety protective circuit of clockwise and anticlockwise motor circuit according to claim 6, it is characterised in that：Further bag Include a second resistance, the resistance of the resistance of the first resistor and the 4th resistance is all 2K ohms, the second resistance Resistance and the resistance of the 5th resistance are all 4.7K ohms, and the resistance of the resistance of the 3rd resistor and the 6th resistance is all It is 1K ohms.
A kind of 9. safety protective circuit of clockwise and anticlockwise motor circuit according to claim 6, it is characterised in that：The electric current Detection circuit includes a linear Hall current sensor, and the Hall current sensor is provided with an input and is used for and described second The source electrode of the source electrode of FET and the 4th FET connects.
A kind of 10. safety protective circuit of clockwise and anticlockwise motor circuit according to claim 9, it is characterised in that：It is described suddenly The model ACS712-20 of your current sensor.