CN218300927U - Low-voltage-drop motor drive protection circuit - Google Patents
Low-voltage-drop motor drive protection circuit Download PDFInfo
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- CN218300927U CN218300927U CN202222148044.1U CN202222148044U CN218300927U CN 218300927 U CN218300927 U CN 218300927U CN 202222148044 U CN202222148044 U CN 202222148044U CN 218300927 U CN218300927 U CN 218300927U
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Abstract
The utility model provides a motor drive protection circuit of low pressure drop, motor drive protection circuit includes motor drive return circuit and pressure drop protection return circuit, motor drive return circuit passes through power source and motor interface connection between power and motor, motor drive return circuit is used for moving according to signal of power driving motor, the pressure drop protection return circuit connects in parallel on motor drive return circuit, the pressure drop protection return circuit is used for turning off according to motor both ends pressure drop control motor drive return circuit. The utility model discloses an application scope is wider, can be applicable to linear drive's the vast majority of scenes, only possesses the power cord in the face of, when the scene under the no all the other drive signal, also can provide the protection for motor drive, and only can realize drive circuit protect function through the voltage drop protection return circuit, need not use the switch strip, can not receive switch strip mechanical life's influence, can provide more long-term protection for motor drive circuit.
Description
Technical Field
The utility model belongs to the technical field of motor drive protection technique and specifically relates to indicate a motor drive protection circuit of low pressure drop.
Background
The motor is a control element capable of converting an electric pulse signal into angular displacement or linear displacement, and in the application process of the motor, in order to ensure the running safety of the motor, a corresponding protection circuit must be equipped for a driving circuit of the motor. Most of existing motor drive protection circuits directly adopt a switch strip to achieve the purpose of motor drive protection, the use of the switch strip can be affected by the mechanical life of the switch strip, the problem of functional failure can occur due to overlong use time, and long-term protection can not be conducted on the motor drive circuit. And when the switch strip is used for motor drive protection, the switch strip can only be used in a scene of providing motor drive signals through a driver, for a push rod with small current and small volume and the like, only a power line exists, and the application scene of other drive signals does not exist, and the motor drive protection circuit for realizing the motor drive protection by adopting the switch strip cannot realize the protection function.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the shortcoming among the prior art, the utility model provides a motor drive protection circuit of low pressure drop, can be through the mode of addding the pressure drop protection return circuit, solve current motor drive protection circuit and be in and only possess the power cord, when no all the other drive signal's scene, can't provide protect function's problem for the motor, and the use of switch strip has been given up, only realize protect function through the circuit, can not receive switch strip mechanical life's influence, only possess the power cord, do not have under all the other drive signal's the scene, also can carry out long-term protection to the drive circuit of motor.
The utility model aims at realizing through the following technical scheme:
the motor driving protection circuit with low voltage drop comprises a motor driving loop and a voltage drop protection loop, wherein the motor driving loop is connected between a power supply and a motor through a power supply interface and a motor interface, the motor driving loop is used for driving the motor to operate according to a power supply signal, the voltage drop protection loop is connected in parallel to the motor driving loop, and the voltage drop protection loop is used for controlling the motor driving loop to be switched off according to the voltage drop at two ends of the motor.
Further, the motor driving circuit includes an MOS transistor Q1, an MOS transistor Q2, an MOS transistor Q3, an MOS transistor Q4, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, and a resistor R6, the power interface includes a first power interface and a second power interface, the motor interface includes a first motor interface and a second motor interface, a drain of the MOS transistor Q1 is connected to the second motor interface, a source of the MOS transistor Q1 is connected to the second power interface through the resistor R3, a gate of the MOS transistor Q1 is connected to the first power interface through the resistor R1, a source of the MOS transistor Q4 is connected to the first power interface, a drain of the MOS transistor Q4 is connected to the first motor interface, and a gate of the MOS transistor Q4 is connected to the first motor interface through the resistor R5; MOS pipe Q3's drain electrode and first motor interface connection, MOS pipe Q3's source electrode passes through resistance R6 and first power interface connection, MOS pipe Q3's grid passes through resistance R4 and second power interface connection, MOS pipe Q2's drain electrode and second motor interface connection, MOS pipe Q2's source electrode and second power interface connection, MOS pipe Q2's grid passes through resistance R2 and first power interface connection.
Furthermore, when the first power interface is connected to the positive electrode of the power supply and the second power interface is connected to the negative electrode of the power supply, the MOS tube Q4 and the MOS tube Q1 in the motor driving loop are sequentially conducted to drive the motor to work.
Furthermore, when the first power interface is connected to the negative electrode of the power supply and the second power interface is connected to the positive electrode of the power supply, the MOS tube Q2 and the MOS tube Q3 in the motor driving loop are sequentially conducted to drive the motor to work.
Further, the voltage drop protection circuit comprises a triode Q5, a triode Q6, a triode Q7, a triode Q8, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4, the emitting set of the triode Q5 is connected with the grid electrode of the MOS tube Q1, the collector electrode of the triode Q5 is connected with the second power interface through a capacitor C2, the base electrode of the triode Q5 is connected with the grid electrode of the MOS tube Q1 through a capacitor C1, a resistor R10 is also connected in parallel on the capacitor C1, the base electrode of the triode Q6 is connected with the collector electrode of the triode Q5, the emitter electrode of the triode Q6 is connected with the second power interface, the collector of the triode Q6 is connected with the base of the triode Q5, one end of the resistor R7 is connected with the second motor interface, the other end of the resistor R7 is connected with the second power interface through the resistor R8, one end of the resistor R9 is connected with the grid electrode of the MOS transistor Q1, the other end of the resistor R9 is connected with the source electrode of the MOS transistor Q1, the emitting electrode of the triode Q7 is connected with the grid electrode of the MOS tube Q3, the collecting electrode of the triode Q7 is connected with the first power interface through a capacitor C4, the base electrode of the triode Q7 is connected with the grid electrode of the MOS tube Q3 through a capacitor C3, a resistor R12 is also connected in parallel on the capacitor C3, the base electrode of the triode Q8 is connected with the collector electrode of the triode Q7, the emitter electrode of the triode Q8 is connected with the first power interface, the collector of the triode Q8 is connected with the base of the triode Q7, one end of the resistor R11 is connected with the first motor interface, the other end of the resistor R11 is connected with the first power interface through the resistor R14, one end of the resistor R13 is connected with the grid electrode of the MOS transistor Q3, and the other end of the resistor R13 is connected with the source electrode of the MOS transistor Q3.
Furthermore, the first power interface is connected with the positive electrode of a power supply, the second power interface is connected with the negative electrode of the power supply, and when the voltage drop loss at two ends of the motor is more than 0.6V, the triode Q5 and the triode Q6 in the voltage drop protection circuit are sequentially started, the MOS tube Q1 in the motor driving circuit is turned off, and the motor stops running.
Furthermore, the first power interface is connected with the negative electrode of a power supply, the second power interface is connected with the positive electrode of the power supply, and when the voltage drop loss at two ends of the motor is more than 0.6V, the triode Q7 and the triode Q8 in the voltage drop protection circuit are sequentially started, the MOS tube Q3 in the motor driving circuit is switched off, and the motor stops running.
The beneficial effects of the utility model are that:
the application range is wider, the linear driving protection device can be suitable for most scenes of linear driving, and when the linear driving protection device faces the scenes which only have power lines and do not have other driving signals, protection can be provided for motor driving. And can effectively reduce the drive circuit pressure drop, prevent that the motor from obtaining the condition appearance that the voltage is too low. And the protection function of the drive circuit can be realized only through the voltage drop protection loop, a switch strip is not needed, the influence of the mechanical service life of the switch strip is avoided, and the motor drive circuit can be protected for a long time.
Drawings
FIG. 1 is a schematic view of the present invention;
fig. 2 is an overall circuit diagram of a motor drive circuit and a voltage drop protection circuit according to embodiment 1 of the present invention;
fig. 3 is an overall circuit diagram of a motor driving circuit and a voltage drop protection circuit according to embodiment 2 of the present invention.
Wherein: 1. and a motor driving loop 2, a voltage drop protection loop 3, a power interface 4, a motor interface 5, a power supply 6 and a motor.
Detailed Description
The present invention is further described with reference to the accompanying drawings and examples.
Example 1:
a low-voltage-drop motor driving protection circuit is shown in figure 1 and comprises a motor driving loop 1 and a voltage drop protection loop 2, wherein the motor driving loop is connected between a power supply 5 and a motor 6 through a power interface 3 and a motor interface 4, the motor driving loop is used for driving the motor to operate according to a power signal, the voltage drop protection loop is connected in parallel to the motor driving loop, and the voltage drop protection loop is used for controlling the motor driving loop to be turned off according to voltage drops at two ends of the motor.
Specifically, an overall circuit diagram of the motor driving circuit and the voltage drop protection circuit is shown in fig. 2. As can be seen from fig. 2:
the motor driving circuit comprises an MOS tube Q1, an MOS tube Q2, an MOS tube Q3, an MOS tube Q4, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5 and a resistor R6, wherein the power supply interface comprises a first power supply interface Pow + and a second power supply interface Pow-, the motor interface comprises a first motor interface Moto + and a second motor interface Moto-, the drain electrode of the MOS tube Q1 is connected with the second motor interface Moto-, the source electrode of the MOS tube Q1 is connected with the second power supply interface Pow-through the resistor R3, the grid electrode of the MOS tube Q1 is connected with the first power supply interface Pow + through the resistor R1, the source electrode of the MOS tube Q4 is connected with the first power supply interface Pow +, the drain electrode of the MOS tube Q4 is connected with the first motor interface Moto +, and the grid electrode of the MOS tube Q4 is connected with the first motor interface Poto + through the resistor R5; MOS pipe Q3's drain electrode is connected with first power source interface Moto +, MOS pipe Q3's source electrode is passed through resistance R6 and is connected with first power source interface Pow +, MOS pipe Q3's grid is passed through resistance R4 and is connected with second power source interface Pow-, MOS pipe Q2's drain electrode is connected with second power source interface Moto-, MOS pipe Q2's source electrode is connected with second power source interface Pow-, MOS pipe Q2's grid is passed through resistance R2 and is connected with first power source interface Pow +.
In this embodiment, the MOS transistor Q1 and the MOS transistor Q3 are both NMOS transistors, and the model of the NMOS transistor is specifically NCE3404Y.
In this embodiment, the MOS transistor Q2 and the MOS transistor Q4 are both PMOS transistors, and the model of the PMOS transistor is NCE60P04Y.
The voltage drop protection circuit comprises a triode Q5, a triode Q6, a triode Q7, a triode Q8, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4, wherein an emission set of the triode Q5 is connected with a grid electrode of the MOS transistor Q1, a collector electrode of the triode Q5 is connected with a second power interface Pow through a capacitor C2, a base electrode of the triode Q5 is connected with a grid electrode of the MOS transistor Q1 through a capacitor C1, the resistor R10 is further connected in parallel on the capacitor C1, a base electrode of the triode Q6 is connected with a collector electrode of the triode Q5, an emitter electrode of the triode Q6 is connected with a second power interface Pow-, a collector electrode of the resistor R7 is connected with a base electrode of the triode Q5 through a resistor R8, one end of the resistor R9 is connected with a collector electrode of the triode Q3, one end of the resistor Q7 is connected with a collector electrode of the MOS transistor Q3 + of the MOS transistor, a first power interface Pow, a collector electrode of the resistor Q3 is connected with a collector electrode of the MOS transistor Q3, a first transistor Q3, a collector electrode of the transistor Q3 is connected with a collector electrode of the MOS transistor Pow + a resistor Q3, a first transistor, a resistor R4, a collector electrode of the transistor Q3, a resistor Q3 + a resistor Q3, a resistor Q3 is connected with a collector electrode of the transistor, a first transistor, a collector electrode of the base electrode of the transistor Q3 + a transistor, a transistor Q3, the other end of the resistor R13 is connected with the source electrode of the MOS transistor Q3.
When the first power interface Pow + is connected with the positive pole of the power supply and the second power interface Pow-is connected with the negative pole of the power supply, the MOS tube Q4 and the MOS tube Q1 in the motor driving loop are sequentially conducted, and at the moment, the circulation sequence of the motor current loop is the first power interface Pow +, the MOS tube Q4, the first motor interface Moto +, the motor, the second motor interface Moto-, the MOS tube Q1, the resistor R3 and the second power interface Pow-.
The voltage available to the motor at this time is determined by the current, specifically, the voltage across the motor is V = Vp-Rn I-Rp I-R3I, where Vp is the input power voltage, rn is the internal resistance of the MOS transistor Q1, rp is the internal resistance of the MOS transistor Q4, I is the motor current, and R3 is the resistance of the resistor R3. Since the internal resistance of the MOS tube is small and can be ignored, V is approximately equal to Vp-R3I.
At the moment, the voltage drop loss V1= Rn + R7 + I at two ends of the motor, when the voltage drop loss V1 exceeds 0.6V, the triode Q5 in the voltage drop protection loop can be automatically switched on, the triode Q6 is switched on, the MOS tube Q1 in the motor driving loop is switched off, the motor loses the loop, the operation is stopped, and the voltage drop loss of the circuit is prevented from being overlarge.
When the first power interface Pow + is connected with the negative pole of a power supply and the second power interface Pow-is connected with the positive pole of the power supply, the MOS tube Q2 and the MOS tube Q3 in the motor driving loop are sequentially conducted, and at the moment, the circulation sequence of the motor current loop is the second power interface Pow-, the MOS tube Q2, the second motor interface Moto-, the motor, the first motor interface Moto +, the MOS tube Q3, the resistor R6 and the first power interface Pow + in sequence.
At this time, the voltage across the motor is V = Vp-Rn I-Rp I-R6I, where Vp is the input power voltage, rn is the internal resistance of the MOS transistor Q3, rp is the internal resistance of the MOS transistor Q4, I is the motor current, and R6 is the resistance of the resistor R6. Since the internal resistance of the MOS tube is small and can be ignored, V is approximately equal to Vp-R6I.
At the moment, the voltage drop loss V1= Rn I + R6I at two ends of the motor, when the voltage drop loss V1 exceeds 0.6V, the triode Q7 in the voltage drop protection loop can be automatically switched on, the triode Q8 is switched on along with the automatic switching on, the MOS tube Q3 in the motor driving loop is switched off, the motor loses the loop, the operation is stopped, and the voltage drop loss of the circuit is prevented from being overlarge.
Example 2:
as an alternative, the structure of the overall motor driving protection circuit in this embodiment is substantially the same as that in embodiment 1, and the voltage drop protection circuit is still used to protect the motor driving circuit, and the overall circuit diagram of the motor driving circuit and the voltage drop protection circuit is specifically shown in fig. 3. The difference is that when the first power interface Pow + is connected with the positive pole of a power supply and the second power interface Pow-is connected with the negative pole of the power supply, the diode replaces the function of an MOS (metal oxide semiconductor) tube Q4 in a motor driving loop, and a diode is additionally arranged between the MOS tube Q1 and the second power interface Pow-. Similarly, when the first power interface Pow + is connected with the negative electrode of the power supply and the second power interface Pow-is connected with the positive electrode of the power supply, the diode replaces the effect of the MOS tube Q2 in the motor driving loop, and the diode is additionally arranged between the MOS tube Q3 and the first power interface Pow +.
As can be seen from fig. 3, when the first power interface Pow + is connected to the positive electrode of the power supply, and the second power interface Pow-is connected to the negative electrode of the power supply, the current loop of the motor flows in the sequence of the first power interface Pow +, the diode D3, the first motor interface Moto +, the motor, the second motor interface Moto-, the MOS transistor Q2, the resistor R7, the diode D2, and the second power interface Pow-.
At this time, the available voltage of the motor is still determined by the current, specifically, the voltage at two ends of the motor is V = Vp-Rn I-Vd3-Vd 2-R3I, where Vp is the input power voltage, rn is the internal resistance of the MOS transistor Q2, vd3 is the voltage of the diode D3, vd2 is the voltage of the diode D2, I is the motor current, and R7 is the resistance of the resistor R7.
At this time, the voltage drop loss V1= Rn + I + R7 + I at the two ends of the motor, when the voltage drop loss V1 exceeds 0.6V, the triode Q5 in the voltage drop protection circuit is automatically turned on, the triode Q3 is then turned on, and the MOS transistor Q2 in the motor driving circuit is turned off. Because two diodes are additionally arranged, the total pressure drop loss at two ends of the motor is 0.6+ Vd3+ Vd2 at the moment.
When the first power interface Pow + is connected with the negative pole of a power supply and the second power interface Pow-is connected with the positive pole of the power supply, the current loop of the motor is sequentially connected with the second power interface Pow-, the diode D4, the second motor interface Moto-, the motor, the first motor interface Moto +, the MOS tube Q4, the resistor R10, the diode D1 and the first power interface Pow +.
At this time, the available voltage of the motor is still determined by the current, specifically, the voltage at two ends of the motor is V = Vp-Rn I-Vd4-Vd 1-R10I, where Vp is the input power voltage, rn is the internal resistance of the MOS transistor Q4, vd1 is the voltage of the diode D1, vd4 is the voltage of the diode D4, I is the motor current, and R10 is the resistance of the resistor R10.
At this time, the voltage drop loss V1= Rn + I + R10 + I at the two ends of the motor, when the voltage drop loss V1 exceeds 0.6V, the triode Q6 in the voltage drop protection circuit is automatically turned on, the triode Q1 is turned on, and the MOS transistor Q4 in the motor driving circuit is turned off. Because two diodes are additionally arranged, the total pressure drop loss at two ends of the motor is 0.6+ Vd4+ Vd1 at the moment.
Compared with embodiment 1, the voltage drop protection circuit in embodiment 2 has higher voltage drop loss but lower overall cost, and can be applied to an application scenario with only a power line and no other driving signals.
The above-described embodiment is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the scope of the invention as set forth in the claims.
Claims (7)
1. The motor driving protection circuit with low voltage drop is characterized by comprising a motor driving loop and a voltage drop protection loop, wherein the motor driving loop is connected between a power supply and a motor through a power supply interface and a motor interface, the motor driving loop is used for driving the motor to operate according to a power supply signal, the voltage drop protection loop is connected in parallel to the motor driving loop, and the voltage drop protection loop is used for controlling the motor driving loop to be switched off according to the voltage drop at two ends of the motor.
2. The low-voltage-drop motor drive protection circuit is characterized in that the motor drive loop comprises a MOS transistor Q1, a MOS transistor Q2, a MOS transistor Q3, a MOS transistor Q4, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5 and a resistor R6, the power supply interface comprises a first power supply interface and a second power supply interface, the motor interface comprises a first motor interface and a second motor interface, the drain electrode of the MOS transistor Q1 is connected with the second motor interface, the source electrode of the MOS transistor Q1 is connected with the second power supply interface through the resistor R3, the gate electrode of the MOS transistor Q1 is connected with the first power supply interface through the resistor R1, the source electrode of the MOS transistor Q4 is connected with the first power supply interface, the drain electrode of the MOS transistor Q4 is connected with the first motor interface, and the gate electrode of the MOS transistor Q4 is connected with the first motor interface through the resistor R5; MOS pipe Q3's drain electrode and first motor interface connection, MOS pipe Q3's source electrode passes through resistance R6 and first power interface connection, MOS pipe Q3's grid passes through resistance R4 and second power interface connection, MOS pipe Q2's drain electrode and second motor interface connection, MOS pipe Q2's source electrode and second power interface connection, MOS pipe Q2's grid passes through resistance R2 and first power interface connection.
3. The low-voltage-drop motor drive protection circuit according to claim 2, wherein when the first power interface is connected to a positive electrode of a power supply and the second power interface is connected to a negative electrode of the power supply, the MOS transistor Q4 and the MOS transistor Q1 in the motor drive circuit are sequentially turned on to drive the motor to operate.
4. The low-voltage-drop motor drive protection circuit according to claim 2, wherein when the first power interface is connected to a negative electrode of a power supply and the second power interface is connected to a positive electrode of the power supply, the MOS transistor Q2 and the MOS transistor Q3 in the motor drive circuit are sequentially turned on to drive the motor to operate.
5. The low dropout protection circuit as claimed in claim 2, wherein said dropout protection circuit comprises a transistor Q5, a transistor Q6, a transistor Q7, a transistor Q8, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4, wherein an emitter of said transistor Q5 is connected to a gate of said MOS transistor Q1, a collector of said transistor Q5 is connected to a second power interface via a capacitor C2, a base of said transistor Q5 is connected to a gate of said MOS transistor Q1 via a capacitor C1, a resistor R10 is connected in parallel to said capacitor C1, a base of said transistor Q6 is connected to a collector of said transistor Q5, an emitter of said transistor Q6 is connected to a second power interface, a collector of said transistor Q6 is connected to a base of said transistor Q5, one end of said resistor R7 is connected to a second motor interface, the other end of said transistor R7 is connected to a second power interface of said transistor Q5 via a resistor R8, a collector of said transistor Q3 is connected to a first power interface of said transistor Q3, a first power interface of said transistor Q7, a first transistor Q7 is connected to a collector of said transistor Q3, a resistor R8, a resistor R7 is connected to a first transistor Q3, a resistor R8, a collector of said transistor Q3 is connected to a resistor C7, a resistor C3, one end of the resistor R13 is connected with a grid electrode of the MOS transistor Q3, and the other end of the resistor R13 is connected with a source electrode of the MOS transistor Q3.
6. The low-voltage-drop motor driving protection circuit according to claim 3 or 5, wherein the first power interface is connected to a positive electrode of a power supply, the second power interface is connected to a negative electrode of the power supply, and when the voltage loss at two ends of the motor is greater than 0.6V, the triode Q5 and the triode Q6 in the voltage drop protection circuit are sequentially turned on, the MOS transistor Q1 in the motor driving circuit is turned off, and the motor stops running.
7. The low-voltage-drop motor driving protection circuit according to claim 4 or 5, wherein the first power interface is connected to a negative electrode of a power supply, the second power interface is connected to a positive electrode of the power supply, and when the voltage loss at two ends of the motor is greater than 0.6V, the triode Q7 and the triode Q8 in the voltage drop protection circuit are sequentially turned on, the MOS transistor Q3 in the motor driving circuit is turned off, and the motor stops running.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222148044.1U CN218300927U (en) | 2022-08-16 | 2022-08-16 | Low-voltage-drop motor drive protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222148044.1U CN218300927U (en) | 2022-08-16 | 2022-08-16 | Low-voltage-drop motor drive protection circuit |
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| CN218300927U true CN218300927U (en) | 2023-01-13 |
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| CN202222148044.1U Active CN218300927U (en) | 2022-08-16 | 2022-08-16 | Low-voltage-drop motor drive protection circuit |
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- 2022-08-16 CN CN202222148044.1U patent/CN218300927U/en active Active
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