CN204859011U - Single power isolation circuit of servo driver - Google Patents

Single power isolation circuit of servo driver Download PDF

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Publication number
CN204859011U
CN204859011U CN201520526196.8U CN201520526196U CN204859011U CN 204859011 U CN204859011 U CN 204859011U CN 201520526196 U CN201520526196 U CN 201520526196U CN 204859011 U CN204859011 U CN 204859011U
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CN
China
Prior art keywords
electric capacity
output
common mode
circuit
power supply
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Application number
CN201520526196.8U
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Chinese (zh)
Inventor
葛恒威
李志刚
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台安科技(无锡)有限公司
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Priority to CN201520526196.8U priority Critical patent/CN204859011U/en
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Publication of CN204859011U publication Critical patent/CN204859011U/en

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Abstract

The utility model discloses a single power isolation circuit of servo driver, including single power rectifier circuit and owner / accuse buffer circuit. Among single power rectifier circuit, the input of alternating current power supply three -phase is put in order to DC power supply with electric capacity through three phase bridge. Carry all the way to the major loop, another sweetgum fruit is crossed transformer and switcher chip and is changed out the low -voltage and offer control circuit. For the noise of avoiding the major loop enters the entry control return circuit, use common mode inductance with the filtering noise among owner / the accuse buffer circuit. Common mode inductance is a two -way wave filter, but the electromagnetic interference that outwards sends of suppression circuit self again filtering DC power supply common mode electromagnetic interference the time, other electronic equipment around not influencing. The utility model discloses can realize that single power provides major loop and control circuit electric energy, both save the cost than the dual supply, can satisfy the EMC requirement than the circuit that single power does not nevertheless possess isolating function again. Through test, the utility model discloses circuit design can accord with the needs of servo driver each item function.

Description

Servo-driver single supply buffer circuit

Technical field

The utility model relates to servo-driver field, is specifically related to a kind of servo-driver single supply buffer circuit.

Background technology

Current servo driver many employings duplicate supply, namely a road input power provides major loop; Separately leading up to transformer and switch chip changes out low-voltage and is supplied to control circuit.Its object is: isolating with control loop of major loop, avoid major loop and control loop coupled interference, improves anti-EMI filter ability.But the consideration of this hardware circuit design of duplicate supply adds cost.Though adopting single supply circuit to fall can low cost, because major loop and control loop power supply are not isolated and cannot be met EMC requirement.

Utility model content

For the problems referred to above, the utility model provides a kind of servo-driver single supply buffer circuit, reduces costs while meeting EMC.

The technical solution of the utility model is as follows:

A kind of servo-driver single supply buffer circuit, comprises single supply rectification circuit and master/control buffer circuit;

Described single supply rectification circuit comprises AC power R, S, T three-phase input end, the first piezo-resistance is connected with between R phase input and T-phase input, the second piezo-resistance is connected with between R phase input and S-phase input, the 3rd piezo-resistance is connected with between S-phase input and T-phase input, R, S, T three-phase input end connects one end of the first electric capacity, the second electric capacity, the 3rd electric capacity respectively, the other end of the first electric capacity, the second electric capacity, the 3rd electric capacity is connected to one end of the 4th electric capacity, the other end ground connection of the 4th electric capacity altogether; R, S, T three-phase input end connects three inputs of three-phase commutation bridge respectively, is connected with the 5th electric capacity between two outputs of three-phase commutation bridge; An output of three-phase commutation bridge is connected after the first resistance and is connect DC power supply P output, and is connected with the 6th drop-down electric capacity; Another of three-phase commutation bridge exports termination DC power supply N output, and is connected with the 7th drop-down electric capacity; 8th electric capacity, the 9th electric capacity, the tenth Capacitance parallel connection are between DC power supply P output and DC power supply N output; The positive pole of the first diode connects PC end, and negative pole connects DC power supply P output; The grid of PMOS connects GB end, and source electrode connects DC power supply N output, and drain electrode connects the positive pole of the first diode;

Described master/control buffer circuit comprises common mode inductance, the first input end of common mode inductance connects DC power supply P output, second input of common mode inductance connects DC power supply N output, one end of first output connection transformer primary coil of common mode inductance, the second output head grounding of common mode inductance; 11 electric capacity is connected between two inputs of common mode inductance, and the 12 electric capacity is connected between two outputs of common mode inductance; Be connected between the first output of common mode inductance and ground after second resistance and the 3rd resistant series; 13 electric capacity is connected between the first output of common mode inductance and ground; 4th resistance is connected the first output of common mode inductance with one end of the 14 electric capacity, the other end is connected to the negative pole of the second diode altogether, the plus earth of the second diode; The other end ground connection of primary transformer coil.

Advantageous Effects of the present utility model is:

The utility model can realize single supply and provide major loop and control loop electric energy, and both saved cost than duplicate supply, the circuit that can possess again isolation features than single supply but not meets EMC requirement, achieves a kind of hardware circuit of practicality.After tested, the utility model circuit design can meet the needs of servo-driver various functions.

Accompanying drawing explanation

Fig. 1 is single supply rectification circuit of the present utility model.

Fig. 2 is master of the present utility model/control buffer circuit.

Embodiment

Below in conjunction with accompanying drawing, embodiment of the present utility model is described further.

The utility model comprises single supply rectification circuit as shown in Figure 1 and master/control buffer circuit as shown in Figure 2.

As shown in Figure 1, single supply rectification circuit comprises AC power R, S, T three-phase input end, be connected with piezo-resistance Z1 between R phase input and T-phase input, between R phase input and S-phase input, be connected with piezo-resistance Z2, between S-phase input and T-phase input, be connected with piezo-resistance Z3.R, S, T three-phase input end connects one end of electric capacity C45, C46, C47 respectively, and the other end of electric capacity C45, C46, C47 is connected to one end of electric capacity C64 altogether, the other end ground connection of electric capacity C64.R, S, T three-phase input end connects 2,3,4 pin of three-phase commutation bridge DM1 (chip model is SC50VB160) respectively, is connected with electric capacity C19 between 1,5 pin of three-phase commutation bridge DM1.Connect DC power supply P output after the 1 pin series resistance RP1 of three-phase commutation bridge DM1, and be connected with drop-down electric capacity C37.5 pin of three-phase commutation bridge DM1 connect DC power supply N output, and are connected with drop-down electric capacity C38.Electric capacity C1, C2, C3 are connected in parallel between DC power supply P output and DC power supply N output.The positive pole of diode D1 connects PC end, and negative pole connects DC power supply P output; The grid of PMOS Q1 connects GB end, and source electrode connects DC power supply N output, and drain electrode connects the positive pole of diode D1.

As shown in Figure 2, main/control buffer circuit comprises common mode inductance L2, and the first input end of common mode inductance L2 connects DC power supply P output, and the second input connects DC power supply N output, one end of first output connection transformer primary coil, the second output head grounding.Electric capacity C103 is connected between two inputs of common mode inductance L2, and electric capacity C15 is connected between two outputs of common mode inductance L2.Be connected between first output of common mode inductance L2 and ground after resistance R101, R100 series connection.Electric capacity C102 is connected between first output of common mode inductance L2 and ground.Resistance R23 is connected first output of common mode inductance L2 with one end of electric capacity C14, the other end is connected to the negative pole of diode D8 altogether, the plus earth of diode D8.The other end ground connection of primary transformer coil.

Operation principle of the present utility model is as follows:

As shown in Figure 1, AC power by R, S, T input, through three-phase commutation bridge DM1 and electric capacity C1, C2, C3 whole be DC power supply Vpn.Vpn mono-tunnel is delivered to major loop, treated one-tenth PWM wave driven motor running; Leading up to transformer and switch chip in addition changes out low-voltage and is supplied to control circuit.At the switching moments (du/dt of the switching-type regulator that IGBT drives; Di/dt is larger) or external electrical network electric power quality is good etc. time, easily there is common mode and differential mode noise in major loop.If can not effectively suppress, then noise is by transformer coupled to Circuit Fault on Secondary Transformer, thus affects control circuit power quality, even can produce erroneous signals.

As shown in Figure 2, for effectively avoiding the noise of major loop to enter control loop, use common mode inductance L2 with filtering noise information.Common mode inductance L2 is a bidirectional filter: on the one hand filtering Vpn common mode electromagnetic interference, on the other hand the electromagnetic interference that outwards sends of circuit capable of inhibiting self again, does not affect other electronic equipments around.When the normal current in circuit flows through common mode inductance L2, electric current produces reverse magnetic field and cancels out each other in the inductance coil of same-phase coiling.When flowing through common mode inductance L2 coil containing common mode noise electric current, due to the same tropism of common mode current, meeting produce magnetic field in the same way and increase the induction reactance of coil in common mode inductance L2 coil, coil is made to show as high impedance, produce stronger damping, with this attenuation common-mode signal, reach the object of filtering.

Above-described is only preferred implementation of the present utility model, and the utility model is not limited to above embodiment.Be appreciated that the oher improvements and changes that those skilled in the art directly derive or associate under the prerequisite not departing from spirit of the present utility model and design, all should think and be included within protection range of the present utility model.

Claims (1)

1. a servo-driver single supply buffer circuit, is characterized in that: comprise single supply rectification circuit and master/control buffer circuit;
Described single supply rectification circuit comprises AC power R, S, T three-phase input end, the first piezo-resistance (Z1) is connected with between R phase input and T-phase input, the second piezo-resistance (Z2) is connected with between R phase input and S-phase input, the 3rd piezo-resistance (Z3) is connected with between S-phase input and T-phase input, R, S, T three-phase input end connects the first electric capacity (C45) respectively, second electric capacity (C46), one end of 3rd electric capacity (C47), first electric capacity (C45), second electric capacity (C46), the other end of the 3rd electric capacity (C47) is connected to one end of the 4th electric capacity (C64) altogether, the other end ground connection of the 4th electric capacity (C64), R, S, T three-phase input end connects three inputs of three-phase commutation bridge (DM1) respectively, is connected with the 5th electric capacity (C19) between two outputs of three-phase commutation bridge (DM1), an output of three-phase commutation bridge (DM1) is connected after the first resistance (RP1) and is connect DC power supply P output, and is connected with the 6th drop-down electric capacity (C37), another of three-phase commutation bridge (DM1) exports termination DC power supply N output, and is connected with the 7th drop-down electric capacity (C38), 8th electric capacity (C1), the 9th electric capacity (C2), the tenth electric capacity (C3) are connected in parallel between DC power supply P output and DC power supply N output, the positive pole of the first diode (D1) connects PC end, and negative pole connects DC power supply P output, the grid of PMOS (Q1) connects GB end, and source electrode connects DC power supply N output, and drain electrode connects the positive pole of the first diode (D1),
Described master/control buffer circuit comprises common mode inductance (L2), the first input end of common mode inductance (L2) connects DC power supply P output, second input of common mode inductance (L2) connects DC power supply N output, one end of first output connection transformer primary coil of common mode inductance (L2), the second output head grounding of common mode inductance (L2); 11 electric capacity (C103) is connected between two inputs of common mode inductance (L2), and the 12 electric capacity (C15) is connected between two outputs of common mode inductance (L2); Between the first output that second resistance (R101) and the 3rd resistance (R100) are connected to common mode inductance (L2) after connecting and ground; Between the first output that 13 electric capacity (C102) is connected to common mode inductance (L2) and ground; 4th resistance (R23) is connected the first output of common mode inductance (L2) with one end of the 14 electric capacity (C14), the other end is connected to the negative pole of the second diode (D8) altogether, the plus earth of the second diode (D8); The other end ground connection of primary transformer coil.
CN201520526196.8U 2015-07-20 2015-07-20 Single power isolation circuit of servo driver CN204859011U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201520526196.8U CN204859011U (en) 2015-07-20 2015-07-20 Single power isolation circuit of servo driver

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Application Number Priority Date Filing Date Title
CN201520526196.8U CN204859011U (en) 2015-07-20 2015-07-20 Single power isolation circuit of servo driver

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CN204859011U true CN204859011U (en) 2015-12-09

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CN201520526196.8U CN204859011U (en) 2015-07-20 2015-07-20 Single power isolation circuit of servo driver

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106559022A (en) * 2015-09-24 2017-04-05 上海电气集团股份有限公司 A kind of AC servo motor position control system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106559022A (en) * 2015-09-24 2017-04-05 上海电气集团股份有限公司 A kind of AC servo motor position control system
CN106559022B (en) * 2015-09-24 2018-12-25 上海电气集团股份有限公司 A kind of AC servo motor position control system

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