CN214227988U - Energy-saving integrated servo motor driving circuit - Google Patents

Abstract

An energy-saving integrated servo motor driving circuit is characterized by comprising: a DC power supply V; the first isolation grid driving circuit receives a U-phase control signal high-end signal UH and a low-end signal UL, and comprises a first bootstrap booster circuit and a first MOS tube output electrode; the first isolation gate driving circuit comprises a driving chip U1, a resistor R1 and a resistor R2, the first bootstrap upgrade circuit comprises a diode D2 and a capacitor C6, and the output electrode of the first MOS transistor comprises an N-channel MOS transistor Q1 and an N-channel MOS transistor Q3. The utility model discloses a novel circuit, through setting up the isolation grid drive circuit that three group structures are the same, bootstrapping boost circuit and MOS pipe output utmost point, both can satisfy smooth and easy work in three phase current supply system, make whole circuit consumption little again, calorific capacity is low, and the circuit is simple, can improve drive circuit's reliability, extension driver and servo motor life by a wide margin, sparingly reprocess the cost.

Description

Energy-saving integrated servo motor driving circuit

Technical Field

The utility model relates to a servo motor's drive circuit especially indicates an energy saving's integration servo motor drive circuit.

Background

The servo motor can control the speed and position accuracy accurately, and can convert the voltage signal into torque and rotating speed to drive a control object. The rotation speed of the rotor of the servo motor is controlled by an input signal and can quickly respond, the servo motor is used as an actuating element in an automatic control system, has the characteristics of small electromechanical time constant, high linearity, starting voltage and the like, and can convert a received electric signal into angular displacement or angular speed on a motor shaft for output. The servo motor is divided into two categories of direct current servo motors and alternating current servo motors, and is mainly characterized in that when the signal voltage is zero, the signal voltage has no autorotation phenomenon, and the rotating speed is reduced at a constant speed along with the increase of the torque.

At present, the conventional servo motor is generally rectangular, and one end of the servo motor is provided with a power output end, and a plurality of wire slots are arranged on a motor body and electrically connected with external control and driving equipment through flat cables. The prior servo motor has the following defects in the using process: 1. the wire arrangement is complex, special wiring is needed, and the fault rate is high due to easy aging of the wire; 2. the occupied space is large when the electric appliance cabinet is installed, and the electric appliance cabinet is required to be matched with the electric appliance cabinet.

At present, with the development of semiconductor technology, more and more devices can adopt a control and drive embedded structure, however, the existing servo motor driver not only has a large circuit board area, but also has high energy consumption, if the servo motor driver is embedded into a servo motor blindly, the failure rate of the servo motor is inevitably improved, and if heat cannot be dissipated in time, fire disasters can be caused, so that great potential safety hazards are caused to textile production.

SUMMERY OF THE UTILITY MODEL

The utility model provides an energy saving's integration servo motor drive circuit, its main aim at overcome the big, high defect of energy consumption of current servo motor driver circuit board area.

The defect of (2).

In order to solve the technical problem, the utility model adopts the following technical scheme:

an energy-saving integrated servo motor driving circuit comprises: a DC power supply V; the first isolation grid driving circuit receives a U-phase control signal high-end signal UH and a low-end signal UL, and comprises a first bootstrap booster circuit and a first MOS tube output electrode; the second isolation grid driving circuit, the second bootstrap booster circuit and the second MOS tube output electrode receive the V-phase control signals VH and VL; the third isolation grid driving circuit, the third bootstrap booster circuit and the third MOS tube output electrode receive the W-phase control signals WH and WL; the first isolation grid driving circuit comprises a driving chip U1, a resistor R1 and a resistor R2, the first bootstrap upgrade circuit comprises a diode D2 and a capacitor C6, the output electrode of the first MOS tube consists of an N-channel MOS tube Q1 and an N-channel MOS tube Q3, a U-phase control signal high-end signal UH and a low-end signal UL are isolated through the inside of the driving chip U1, the high-end signal UH is output to the N-channel MOS tube Q1 through the driving chip U1, the low-end signal UL is output to the N-channel MOS tube Q3 through the driving chip U1, a timing control circuit generated inside the driving chip U1 is used for realizing the state of the circuits, when the N-channel MOS tube Q1 is cut off and the N-channel MOS tube Q84 is turned on, a direct current power supply V charges the capacitor C6 through the diode D2, the voltage on the capacitor C6 is close to the voltage of a direct current power supply V, when the N-channel MOS tube Q1 is turned on and the N-channel MOS tube Q375 is turned on, a source voltage of the N-channel MOS tube Q1 and a source electrode Q57324 is established between the N-channel MOS tube Q1, the capacitor C6 discharges when the driving chip U1 drives the N-channel MOS tube Q1, the above processes are repeated when the N-channel MOS tube Q1/the N-channel MOS tube Q3 work, the charging/discharging action is repeated on the capacitor C6, and the grid driving voltage is kept high enough on the C6 due to the quick charging and slow discharging of the C6, so that the driving chip U1 and the N-channel MOS tube Q1 can work normally.

Further, the second isolated gate driving circuit includes a driving chip U2, a resistor R3 and a resistor R11, the second bootstrap upgrade circuit includes a diode D3 and a capacitor C7, the output terminal of the second MOS transistor includes an N-channel MOS transistor Q2 and an N-channel MOS transistor Q4, after the high-side signal VH and the low-side signal VL of the V-phase control signal are isolated by the driving chip U2, the high-side signal VH is output to the N-channel MOS transistor Q2 by the driving chip U2, the low-side signal VL is output to the N-channel MOS transistor Q4 by the driving chip U2, and the on-off state of the above circuits is realized by a timing control circuit generated inside the driving chip U2, when the N-channel MOS transistor Q2 is turned off and the N-channel MOS transistor Q4 is turned on, the capacitor C7 is charged by the dc power V through the diode D3, at this time, the voltage of the capacitor C7 is close to the voltage of the dc power V, when the N-channel MOS transistor Q2 is turned on and the N-channel MOS transistor Q4 is turned off, the voltage on the capacitor C7 establishes a driving circuit between the gate and the source of the N-channel MOS tube Q2, so that the driving chip U2 drives the N-channel MOS tube Q2 to use, at the moment, the capacitor C7 discharges, when the N-channel MOS tube Q2/the N-channel MOS tube Q4 works, the processes are continuously repeated, the charging/discharging action is repeatedly carried out on the capacitor C7, because the C7 charges quickly and discharges slowly, a sufficiently high gate driving voltage is kept on the C7, and the driving chip U2 and the N-channel MOS tube Q2 can work normally.

Further, the third isolated gate driving circuit includes a driving chip U3, a resistor R12 and a resistor R30, the third bootstrap upgrade circuit includes a diode D1 and a capacitor C10, the output terminal of the third MOS transistor includes an N-channel MOS transistor Q5 and an N-channel MOS transistor Q6, after the W-phase control signal high-side signal WH and the low-side signal WL are isolated from each other inside the driving chip U3, the high-side signal WH is output from the driving chip U3 to the N-channel MOS transistor Q5, the low-side signal WL is output from the driving chip U3 to the N-channel MOS transistor Q6, and the on-off state of the above circuits is realized by a timing control circuit generated inside the driving chip U3, when the N-channel MOS transistor Q5 is turned off and the N-channel MOS transistor Q6 is turned on, the dc power V charges the capacitor C10 through the diode D1, at this time, the voltage of the capacitor C10 is close to the voltage of the dc power V, when the N-channel MOS transistor Q5 is turned off and the N-channel MOS transistor Q6 is turned on, the voltage on the capacitor C10 establishes a driving circuit between the gate and the source of the N-channel MOS tube Q5, so that the driving chip U3 drives the N-channel MOS tube Q5 to use, at the moment, the capacitor C10 discharges, when the N-channel MOS tube Q5/the N-channel MOS tube Q6 works, the processes are continuously repeated, the charging/discharging action is repeatedly carried out on the capacitor C10, because the C10 charges quickly and discharges slowly, a sufficiently high gate driving voltage is kept on the C10, and the driving chip U3 and the N-channel MOS tube Q5 can work normally.

The motor protection circuit is composed of an upper end current protection circuit and a lower end current protection circuit, the upper end current protection circuit is composed of a photoelectric coupler U15, a capacitor C8, a resistor R8 and a resistor R5, and the resistor R5 is connected in series with the drain electrodes of an N-channel MOS tube Q1, an N-channel MOS tube Q2 and an N-channel MOS tube Q5 and used for detecting total working current and converting the total working current into voltage; the resistor R8 and the capacitor C8 form a low-pass filter, the pulsating working voltage is filtered to form direct-current voltage which is input to the photoelectric coupler U15, and when the voltage is higher than 1V, the photoelectric coupler U15 is conducted and outputs a low-level signal to indicate overcurrent.

Further, the lower-end current protection circuit is composed of a triode Q7, a capacitor C9, a resistor R22, a resistor R23 and a resistor R6, wherein the resistor R6 is connected in series with the source of the N-channel MOS transistor Q6, and converts the source current of the N-channel MOS transistor Q6 into voltage; the resistor R22, the resistor R23 and the capacitor C9 form a low-pass filter, the pulsating working voltage is filtered to form direct-current voltage which is input into the triode Q7, and when the voltage is higher than 0.7V, the triode Q7 is conducted and outputs a low-level signal to indicate overcurrent.

Compared with the prior art, the utility model discloses the beneficial effect who produces lies in:

the utility model discloses a novel circuit, through setting up the isolation grid drive circuit that three group structures are the same, bootstrapping boost circuit and MOS pipe output utmost point, both can satisfy smooth and easy work in three phase current supply system, make whole circuit consumption little again, calorific capacity is low, and the circuit is simple, can improve drive circuit's reliability, extension driver and servo motor life by a wide margin, sparingly reprocess the cost.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a servo motor applied in the present invention.

Fig. 2 is an exploded view of fig. 1.

Fig. 3 is a schematic block diagram of a circuit board unit applied in the present invention.

Fig. 4 is a circuit diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Reference is made to fig. 1, 2, 3 and 4. The utility model provides a construction improvement's integrated servo motor, includes motor body 1, motor body 1 is provided with power take off 2 in its ascending one side of length direction, and above-mentioned integrated servo motor still includes a afterbody and extends seat 3, this afterbody extend seat 3 set up in the ascending opposite side of length direction of motor body 1, the extending direction that the afterbody extended seat 3 was unanimous with the length direction of above-mentioned motor body 1.

Reference is made to fig. 1, 2, 3 and 4. At least one circuit board unit 4 for driving the motor body 1 to execute actions is arranged in the tail extension seat 3.

Reference is made to fig. 1, 2, 3 and 4. The mounting direction of the circuit board unit 4 is consistent with the length direction of the motor body 1.

Reference is made to fig. 1, 2, 3 and 4. The cross section of the tail extension seat 3 is consistent with the shape and the size of the cross section of the motor body 1.

Reference is made to fig. 1, 2, 3 and 4. The tail extension base 3 is composed of an upper shell 30 and a lower shell 31 which are symmetrically arranged, and the upper shell 30 and the lower shell 31 are detachably mounted on the motor body 1.

Reference is made to fig. 1, 2, 3 and 4. At least one elongated mounting hole 300 is formed in the cross section of each of the upper casing 30 and the lower casing 31, a plurality of bolt pieces 5 extending from one side of the power output end 2 to the other side are correspondingly arranged on the motor body 1, and the upper casing 30 and the lower casing 31 are fastened with the bolt pieces 5 through the respective elongated mounting holes 300.

Reference is made to fig. 1, 2, 3 and 4. The motor body 1 is provided with an encoder 6 with a section smaller than that of the motor body 1 on one side opposite to the power output end 2, the inner sides of the upper shell 30 and the lower shell 31 are respectively provided with an accommodating cavity 301 for accommodating the encoder 6, and the circuit board unit 4 is installed in the accommodating cavity 301 and is positioned on the other side of the encoder 6.

Reference is made to fig. 1, 2, 3 and 4. The upper and lower cases 30 and 31 are provided with a heat dissipation structure at a side opposite to the accommodation chamber 301.

Reference is made to fig. 1, 2, 3 and 4. The upper casing 30 and the lower casing 31 are aluminum alloy casings, and the heat dissipation structure includes a plurality of heat dissipation fins 302 arranged at intervals.

Reference is made to fig. 1, 2, 3 and 4. The circuit board unit 4 comprises an external signal input interface 40, an optical fiber communication module 41, an encoder interface circuit 42, an ARM processor 43, a motor driving circuit 44 and a direct current power supply V, the motor driving circuit 44 comprises a sequential control circuit 45, a motor protection circuit 46 and a driving working circuit 47, the external signal input interface 40, the optical fiber communication module 41 and the ARM processor 43 are connected in two directions, an output end of the encoder 6 circuit is connected with an enabling end of the ARM processor 43, the enabling end of the sequential control circuit 45 is connected with an output end of the ARM processor 43, an output end of the sequential control circuit 45 is connected with the enabling end of the motor protection circuit 46, and an output end of the motor protection circuit 46 is connected with the enabling end of the driving working circuit 47.

Refer to fig. 4. The drive operation circuit 47 includes: the first isolation grid driving circuit receives a U-phase control signal high-end signal UH and a low-end signal UL, and comprises a first bootstrap booster circuit and a first MOS tube output electrode; the second isolation grid driving circuit, the second bootstrap booster circuit and the second MOS tube output electrode receive the V-phase control signals VH and VL; the third isolation grid driving circuit, the third bootstrap booster circuit and the third MOS tube output electrode receive the W-phase control signals WH and WL; the first isolation gate drive circuit comprises a drive chip U1, a resistor R1 and a resistor R2, the first bootstrap upgrade circuit comprises a diode D2 and a capacitor C6, the output electrode of the first MOS tube consists of an N-channel MOS tube Q1 and an N-channel MOS tube Q3, a U-phase control signal high-end signal UH and a low-end signal UL are isolated by the interior of the drive chip U1, the high-end signal UH is output to the N-channel MOS tube Q1 by the drive chip U1, the low-end signal UL is output to the N-channel MOS tube Q3 by the drive chip U1, and the on-off state of the above circuits is realized by a timing control circuit 45 generated in the drive chip U1, when the N-channel MOS tube Q1 is cut off and the N-channel MOS tube Q3 is turned on, a direct current power supply V charges the capacitor C6 through the diode D2, the voltage on the capacitor C6 is close to the voltage of a direct current power supply V, when the N-channel MOS tube Q1 is turned on and the N-channel MOS tube Q5 is turned off, a source voltage of the N-channel MOS tube Q1 and a source electrode of the drive circuit is established between the N-channel MOS tube Q57323, the capacitor C6 discharges when the driving chip U1 drives the N-channel MOS tube Q1, the above processes are repeated when the N-channel MOS tube Q1/the N-channel MOS tube Q3 work, the charging/discharging action is repeated on the capacitor C6, and the grid driving voltage is kept high enough on the C6 due to the quick charging and slow discharging of the C6, so that the driving chip U1 and the N-channel MOS tube Q1 can work normally.

Refer to fig. 4. The second isolated gate driving circuit comprises a driving chip U2, a resistor R3 and a resistor R11, the second bootstrap upgrade circuit comprises a diode D3 and a capacitor C7, the output electrode of the second MOS tube comprises an N-channel MOS tube Q2 and an N-channel MOS tube Q4, after a V-phase control signal high-end signal VH and a low-end signal VL are isolated inside the driving chip U2, the high-end signal VH is output to the N-channel MOS tube Q2 by the driving chip U2, the low-end signal VL is output to the N-channel MOS tube Q4 by the driving chip U2, and the timing control circuit 45 generated inside the driving chip U2 is used for realizing the state of the circuits, when the N-channel MOS tube Q2 is cut off and the N-channel MOS tube Q84 is switched on, a direct current power supply V charges the capacitor C7 through the diode D3, the voltage on the capacitor C7 is close to the voltage of the direct current power supply V, when the N-channel MOS tube Q2 is switched on and the N-channel MOS tube Q5 is switched on, the N-channel MOS tube Q2 and a source voltage on the source MOS tube Q3724 is established between the source driving circuit, the capacitor C7 discharges when the driving chip U2 drives the N-channel MOS tube Q2, the above processes are repeated when the N-channel MOS tube Q2/the N-channel MOS tube Q4 work, the charging/discharging action is repeated on the capacitor C7, and the grid driving voltage is kept high enough on the C7 due to the quick charging and slow discharging of the C7, so that the driving chip U2 and the N-channel MOS tube Q2 can work normally.

Refer to fig. 4. The third isolated gate driving circuit comprises a driving chip U3, a resistor R12 and a resistor R30, the third bootstrap upgrade circuit comprises a diode D1 and a capacitor C10, the output electrode of the third MOS tube comprises an N-channel MOS tube Q5 and an N-channel MOS tube Q6, after the W-phase control signal high-end signal WH and the low-end signal WL are isolated by the inside of the driving chip U3, the high-end signal WH is output to the N-channel MOS tube Q5 by the driving chip U3, the low-end signal WL is output to the N-channel MOS tube Q6 by the driving chip U3, and the on-off state of the above circuits is realized by a timing control circuit 45 generated inside the driving chip U3, when the N-channel MOS tube Q5 is turned off and the N-channel MOS tube Q6 is turned on, a direct current power supply V charges the capacitor C10 through the diode D1, the voltage on the capacitor C10 is close to the voltage of the direct current power supply V, when the N-channel MOS tube Q5 is turned on, and the N-channel MOS tube Q5 is turned off, a source voltage of the N-channel MOS tube Q5 and a source electrode of the N-channel MOS tube Q57323 is established between the source circuit, the capacitor C10 discharges when the driving chip U3 drives the N-channel MOS tube Q5, the above processes are repeated when the N-channel MOS tube Q5/the N-channel MOS tube Q6 work, the charging/discharging action is repeated on the capacitor C10, and the grid driving voltage is kept high enough on the C10 due to the quick charging and slow discharging of the C10, so that the driving chip U3 and the N-channel MOS tube Q5 can work normally.

Refer to fig. 4. The motor protection circuit 46 consists of an upper end current protection circuit and a lower end current protection circuit, the upper end current protection circuit consists of a photoelectric coupler U15, a capacitor C8, a resistor R8 and a resistor R5, and the resistor R5 is connected in series with the drain electrodes of an N-channel MOS tube Q1, an N-channel MOS tube Q2 and an N-channel MOS tube Q5 and is used for detecting the total working current and converting the total working current into voltage; the resistor R8 and the capacitor C8 form a low-pass filter, the pulsating working voltage is filtered to form direct-current voltage which is input to the photoelectric coupler U15, and when the voltage is higher than 1V, the photoelectric coupler U15 is conducted and outputs a low-level signal to indicate overcurrent.

Refer to fig. 4. The lower-end current protection circuit consists of a triode Q7, a capacitor C9, a resistor R22, a resistor R23 and a resistor R6, wherein the resistor R6 is connected in series with the source electrode of an N-channel MOS tube Q6, and the source electrode current of the N-channel MOS tube Q6 is converted into voltage; the resistor R22, the resistor R23 and the capacitor C9 form a low-pass filter, the pulsating working voltage is filtered to form direct-current voltage which is input into the triode Q7, and when the voltage is higher than 0.7V, the triode Q7 is conducted and outputs a low-level signal to indicate overcurrent.

The utility model discloses a circuit, through setting up the isolation grid drive circuit that three group structures are the same, bootstrapping boost circuit and MOS pipe output utmost point, both can satisfy smooth and easy work in three phase current supply system, make whole circuit consumption little again, calorific capacity is low, and the circuit is simple, can improve drive circuit's reliability, extension driver and servo motor life by a wide margin, sparingly reprocess the cost.

The utility model discloses well circuit board unit 4 designs small and exquisite pleasing to the eye, therefore can satisfy completely and place in the holding chamber 301 in, through the modification design of circuit, can reduce the calorific capacity of circuit board widely moreover for only rely on aluminum alloy shell and heat radiation fins 302's effect can fully take away the heat that the equipment produced when moving, guarantee the long-time smooth and easy work of circuit, greatly improved the life of product.

Compared with the prior art, the utility model discloses the beneficial effect who produces lies in:

the utility model has the advantages of simple structure, therefore, the clothes hanger is strong in practicability, set up afterbody extension seat 3 through the opposite side that sets up at motor body 1, not only can get up the 6 protections of encoder at the motor rear portion, and can directly install circuit board unit 4 additional inside, just so make servo motor need not go to be connected with outside control and drive arrangement through the wiring in addition, place servo motor in realizing control and the drive completely in, through adding afterbody extension seat 3 of establishing, can make servo motor original motor body 1's extra long version, therefore, many servo motor can be close to and arrange, not only improve clean and tidy nature and the aesthetic property of installation widely, and need not reserve the wiring position, greatly reduce occupation space.

It is right above the utility model provides an energy saving's integrated servo motor drive circuit has carried out detailed introduction. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims (5)

1. An energy-saving integrated servo motor driving circuit is characterized by comprising: a DC power supply V; the first isolation grid driving circuit receives a U-phase control signal high-end signal UH and a low-end signal UL, and comprises a first bootstrap booster circuit and a first MOS tube output electrode; the second isolation grid driving circuit, the second bootstrap booster circuit and the second MOS tube output electrode receive the V-phase control signals VH and VL; the third isolation grid driving circuit, the third bootstrap booster circuit and the third MOS tube output electrode receive the W-phase control signals WH and WL; the first isolation grid driving circuit comprises a driving chip U1, a resistor R1 and a resistor R2, the first bootstrap upgrade circuit comprises a diode D2 and a capacitor C6, the output electrode of the first MOS tube consists of an N-channel MOS tube Q1 and an N-channel MOS tube Q3, a U-phase control signal high-end signal UH and a low-end signal UL are isolated through the inside of the driving chip U1, the high-end signal UH is output to the N-channel MOS tube Q1 through the driving chip U1, the low-end signal UL is output to the N-channel MOS tube Q3 through the driving chip U1, a timing control circuit generated inside the driving chip U1 is used for realizing the state of the circuits, when the N-channel MOS tube Q1 is cut off and the N-channel MOS tube Q84 is turned on, a direct current power supply V charges the capacitor C6 through the diode D2, the voltage on the capacitor C6 is close to the voltage of a direct current power supply V, when the N-channel MOS tube Q1 is turned on and the N-channel MOS tube Q375 is turned on, a source voltage of the N-channel MOS tube Q1 and a source electrode Q57324 is established between the N-channel MOS tube Q1, the capacitor C6 discharges when the driving chip U1 drives the N-channel MOS tube Q1, the above processes are repeated when the N-channel MOS tube Q1/the N-channel MOS tube Q3 work, the charging/discharging action is repeated on the capacitor C6, and the grid driving voltage is kept high enough on the C6 due to the quick charging and slow discharging of the C6, so that the driving chip U1 and the N-channel MOS tube Q1 can work normally.

2. The integrated servo motor driving circuit for saving energy consumption as claimed in claim 1, wherein: the second isolated gate driving circuit comprises a driving chip U2, a resistor R3 and a resistor R11, the second bootstrap upgrade circuit comprises a diode D3 and a capacitor C7, the output electrode of the second MOS tube comprises an N-channel MOS tube Q2 and an N-channel MOS tube Q4, after the V-phase control signal high-end signal VH and the low-end signal VL are isolated inside the driving chip U2, the high-end signal VH is output to the N-channel MOS tube Q2 by the driving chip U2, the low-end signal VL is output to the N-channel MOS tube Q4 by the driving chip U2, and the on-off state of the circuits is realized through a timing control circuit generated inside the driving chip U2, when the N-channel MOS tube Q2 is turned off and the N-channel MOS tube Q84 is turned on, a direct current power supply V charges the capacitor C7 through the diode D3, the voltage on the capacitor C7 is close to the voltage of the direct current supply V, when the N-channel MOS tube Q2 is turned on and the N-channel MOS tube Q5 is turned off, the voltage on the source of the N-channel MOS tube Q2 and the source driving circuit 57324 is established between the N-channel MOS tube Q2, the capacitor C7 discharges when the driving chip U2 drives the N-channel MOS tube Q2, the above processes are repeated when the N-channel MOS tube Q2/the N-channel MOS tube Q4 work, the charging/discharging action is repeated on the capacitor C7, and the grid driving voltage is kept high enough on the C7 due to the quick charging and slow discharging of the C7, so that the driving chip U2 and the N-channel MOS tube Q2 can work normally.

3. The integrated servo motor driving circuit for saving energy consumption as claimed in claim 2, wherein: the third isolated gate driving circuit comprises a driving chip U3, a resistor R12 and a resistor R30, the third bootstrap upgrade circuit comprises a diode D1 and a capacitor C10, the output electrode of the third MOS tube comprises an N-channel MOS tube Q5 and an N-channel MOS tube Q6, after the W-phase control signal high-end signal WH and the low-end signal WL are isolated by the inside of the driving chip U3, the high-end signal WH is output to the N-channel MOS tube Q5 by the driving chip U3, the low-end signal WL is output to the N-channel MOS tube Q6 by the driving chip U3, and the timing control circuit generated inside the driving chip U3 is used for realizing the state of the above circuits, when the N-channel MOS tube Q5 is cut off and the N-channel MOS tube Q84 is turned on, the capacitor C10 is charged by the DC power supply V through the diode D1, the voltage on the capacitor C10 is close to the voltage of the DC power supply V, when the N-channel MOS tube Q5 is turned on and the N-channel MOS tube Q375 is turned on, the N-channel MOS tube Q5 and a source voltage of the source driving circuit is established between the source MOS tube Q5857324, the capacitor C10 discharges when the driving chip U3 drives the N-channel MOS tube Q5, the above processes are repeated when the N-channel MOS tube Q5/the N-channel MOS tube Q6 work, the charging/discharging action is repeated on the capacitor C10, and the grid driving voltage is kept high enough on the C10 due to the quick charging and slow discharging of the C10, so that the driving chip U3 and the N-channel MOS tube Q5 can work normally.

4. The integrated servo motor driving circuit for saving energy consumption as claimed in claim 3, wherein: the motor protection circuit is composed of an upper end current protection circuit and a lower end current protection circuit, the upper end current protection circuit is composed of a photoelectric coupler U15, a capacitor C8, a resistor R8 and a resistor R5, and the resistor R5 is connected in series with the drain electrodes of an N-channel MOS tube Q1, an N-channel MOS tube Q2 and an N-channel MOS tube Q5 and used for detecting the total working current and converting the total working current into voltage; the resistor R8 and the capacitor C8 form a low-pass filter, the pulsating working voltage is filtered to form direct-current voltage which is input to the photoelectric coupler U15, and when the voltage is higher than 1V, the photoelectric coupler U15 is conducted and outputs a low-level signal to indicate overcurrent.

5. The integrated servo motor driving circuit for saving energy consumption as claimed in claim 4, wherein: the lower-end current protection circuit consists of a triode Q7, a capacitor C9, a resistor R22, a resistor R23 and a resistor R6, wherein the resistor R6 is connected in series with the source electrode of an N-channel MOS tube Q6, and the source electrode current of the N-channel MOS tube Q6 is converted into voltage; the resistor R22, the resistor R23 and the capacitor C9 form a low-pass filter, the pulsating working voltage is filtered to form direct-current voltage which is input into the triode Q7, and when the voltage is higher than 0.7V, the triode Q7 is conducted and outputs a low-level signal to indicate overcurrent.

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