CN115528901B - Servo driver multiplexed output power supply device - Google Patents
Servo driver multiplexed output power supply device Download PDFInfo
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- CN115528901B CN115528901B CN202211471452.9A CN202211471452A CN115528901B CN 115528901 B CN115528901 B CN 115528901B CN 202211471452 A CN202211471452 A CN 202211471452A CN 115528901 B CN115528901 B CN 115528901B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33561—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having more than one ouput with independent control
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The application provides a servo driver multi-output power supply device, which is characterized in that an overcurrent time controllable circuit and an IGBT (insulated gate bipolar transistor) drive overvoltage detection circuit are added in a primary side control circuit, so that overcurrent and overvoltage protection of a servo driver switching power supply is realized, and the product safety is greatly enhanced; meanwhile, the bus voltage magnetic isolation detection technology is used for realizing the bus voltage detection with high precision and low cost.
Description
Technical Field
The application relates to the technical field of electric servo drivers, in particular to a servo driver multi-output power supply device.
Background
In the field of current low-power and high-integration servo drivers, a switching power supply is generally designed to be composed of a control power supply, an IGBT (insulated gate bipolar transistor) driving power supply and an auxiliary power supply. In the overcurrent protection of the switching power supply, a shunt is generally connected in series at the low side of a switching tube and is used for collecting the current when the switching tube is conducted; when the secondary side is overloaded, overcurrent and short-circuited, the switching power supply control IC can be frequently started to enter a hiccup state, the hiccup time is not controlled, and under the long-time hiccup state, a power device on a loop is easily damaged due to overhigh temperature rise and the electrical safety problem is brought.
In addition, because of the limit requirement of the IGBT on the driving voltage, the overvoltage protection of the IGBT driving power supply can be monitored only by an extra circuit, the cost is increased, and the board distribution space is occupied. The bus voltage sampling of the servo driver generally adopts isolated ADC or differential sampling of large resistance voltage reduction, has the advantage of high sampling precision, and also has the defects of high cost, more required devices and large board distribution space.
Disclosure of Invention
The application provides a servo driver multiplexed output power supply unit, and the device is used for solving the multiplexed output switching power supply in servo driver field "hiccup" time uncontrolled when transshipping, overflowing, short-circuit, IGBT driving voltage's overvoltage monitoring and overvoltage protection's problem. By the technical scheme, the bus voltage sampling is low in cost, the requirements of high precision and high isolation voltage are met, and the bus voltage sampling device has the characteristics of high integration, multiple protection and high reliability. The technical scheme is as follows:
a servo driver multi-output power supply device comprises a rectifying unit, a filtering unit, a switch converter, a control circuit, a rectifying and filtering circuit group, an isolation feedback circuit, an overcurrent protection time controllable circuit, an overvoltage detection circuit, a bus voltage detection and voltage division unit and a signal conditioning unit, wherein the rectifying unit is connected with the filtering unit;
the rectifying unit is connected with the filtering unit, and the alternating current input passes through the rectifying unit and then is input into the filtering unit;
the filtering unit is respectively connected with the primary side of the switch converter, the control circuit and the overcurrent protection time controllable circuit, and is used for performing smooth filtering on the rectified alternating current input to obtain a smooth alternating current input direct current voltage;
the control circuit is respectively connected with the switch converter, the overcurrent protection time controllable circuit, the overvoltage detection circuit and the isolation feedback circuit and is used for adjusting and controlling the switch converter in a PWM (pulse-width modulation) mode according to the feedback input of the isolation feedback circuit so as to stabilize the output voltage of the rectification filter circuit group;
the rectification filter circuit group consists of 4 paths of rectification filter circuits, each path of rectification filter circuit comprises an output rectification circuit and an output filter circuit which are connected in series, and the output rectification circuit is connected with the secondary winding of the switch converter and is used for smoothing each path of output of the secondary winding of the switch converter to obtain multiple paths of smooth direct-current voltages;
the isolation feedback circuit feeds back and outputs one path of smooth direct current voltage output by the rectification filter circuit group to the control circuit;
the output ends of the overvoltage detection circuit and the overcurrent protection time controllable circuit are respectively connected with the control circuit, the input end of the overvoltage detection circuit is connected with the primary side of the switch converter, the input end of the overcurrent protection time controllable circuit is connected with the output end of the filter unit, and the overvoltage detection circuit and the overcurrent protection time controllable circuit are used for providing overvoltage and overcurrent protection for the primary side of the switch converter.
Furthermore, one output of the rectification filter circuit group is sequentially connected with the bus voltage detection voltage division unit and the signal conditioning unit and finally output to an ADC port of the CPU so as to realize bus voltage acquisition.
Furthermore, the switch converter adopts a flyback switch transformer T1, a primary winding composed of 9-7 pins of the flyback switch transformer T1, and 4 groups of secondary windings in total.
Furthermore, the first secondary winding is composed of 4-2 pins of the flyback switching transformer T1, and the first path of rectifying and filtering circuit connected with the first secondary winding includes a rectifying and filtering circuit composed of D1, CD1, C2, L2, C3, and C4, and an RC absorbing circuit composed of R1 and C1.
Further, the output of the first path of rectifying and filtering circuit is power VCC and GND.
Furthermore, the second secondary winding is composed of 5-6 pins of the flyback switching transformer T1, and the second path of rectification filter circuit connected with the second secondary winding comprises a rectification filter loop composed of D4, CD2 and C9.
Further, the output of the second path of rectifying and filtering circuit is power supply 24V and COM.
Furthermore, the third secondary winding is composed of pins 10-11 of the flyback switching transformer T1, and the third rectifying and filtering circuit connected to the third secondary winding includes two branch rectifying and filtering circuits, a first branch rectifying and filtering circuit composed of D8, CD4, and C11, and a second branch rectifying and filtering circuit composed of D7, CD3, and C12.
Further, the output of the first branch rectifying and filtering circuit in the third branch rectifying and filtering circuit is an IGBT driving power supply f16.5v and DCN, and the output of the second branch rectifying and filtering circuit is an auxiliary power supply winding VC15 and DCN.
Furthermore, the fourth secondary winding is composed of a pin 2-1 of a flyback switching transformer T1, and a fourth rectifying and filtering circuit connected with the fourth secondary winding comprises a forward rectifying and filtering loop composed of D2 and C7; and the output of the fourth path of rectifying and filtering circuit is connected with the bus voltage detection and voltage division unit.
Through the embodiment of the application, the following technical effects can be obtained: according to the over-current and over-voltage protection method, the over-current time controllable circuit is added into the primary side control circuit, and the IGBT drives the over-voltage detection circuit, so that over-current and over-voltage protection of the switching power supply of the servo driver is realized, and the product safety is greatly enhanced; meanwhile, the bus voltage magnetic isolation detection technology is used for realizing the bus voltage detection with high precision and low cost.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to the drawings without inventive labor.
FIG. 1 is a schematic diagram of a functional module structure of a multi-output power supply device;
FIG. 2 is a schematic circuit diagram of a multiple output power supply apparatus;
fig. 3 is a schematic circuit diagram of a voltage follower.
Reference numerals:
101. the overcurrent protection circuit comprises an overcurrent protection time controllable circuit, a 201 overvoltage detection circuit, a 301 bus voltage detection voltage division unit and a 401 signal conditioning unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a schematic diagram of a functional module structure of a multi-output power supply device. The multi-output power supply device comprises a rectifying unit, a filtering unit, a switch converter, a control circuit, a rectifying and filtering circuit group, an isolation feedback circuit, an overcurrent protection time controllable circuit, an overvoltage detection circuit, a bus voltage detection and voltage division unit and a signal conditioning unit;
the rectifying unit is connected with the filtering unit, and the alternating current input passes through the rectifying unit and then is input into the filtering unit;
the filtering unit is respectively connected with the primary side of the switch converter, the control circuit and the overcurrent protection time controllable circuit, and is used for performing smooth filtering on the rectified alternating current input to obtain a smooth alternating current input direct current voltage;
the control circuit is respectively connected with the switch converter, the overcurrent protection time controllable circuit, the overvoltage detection circuit and the isolation feedback circuit and is used for adjusting and controlling the switch converter in a PWM (pulse width modulation) mode according to the feedback input of the isolation feedback circuit so as to stabilize the output voltage of the rectification filter circuit group;
the rectification filter circuit group consists of 4 paths of rectification filter circuits, each path of rectification filter circuit comprises an output rectification circuit and an output filter circuit which are connected in series, and the output rectification circuit is connected with the secondary winding of the switch converter and is used for smoothing each path of output of the secondary winding of the switch converter to obtain multiple paths of smooth direct-current voltages;
the isolation feedback circuit feeds back and outputs one path of smooth direct current voltage output by the rectification filter circuit group to the control circuit;
the output ends of the overvoltage detection circuit and the overcurrent protection time controllable circuit are respectively connected with the control circuit, the input end of the overvoltage detection circuit is connected with the primary side of the switch converter, the input end of the overcurrent protection time controllable circuit is connected with the output end of the filter unit, and the overvoltage detection circuit and the overcurrent protection time controllable circuit are used for providing overvoltage and overcurrent protection for the primary side of the switch converter;
one output of the rectification filter circuit group is sequentially connected with the bus voltage detection voltage division unit and the signal conditioning unit and finally output to an ADC port of the CPU so as to realize bus voltage acquisition.
Fig. 2 is a schematic circuit diagram of the multi-output power supply device. The main functions of the power supply chip U1 are:
(1) The internal reference voltage 5VREF with the precision of +/-2.0% is 5.00V, so that the temperature stability is high and the noise level is low;
(2) The highest oscillation frequency of the oscillator can reach 500kHz, and the frequency of the internal oscillator is determined by a resistor R13 between the pin 8 and the pin 4 and a grounding capacitor C17 of the pin 4;
(3) The PWM (Pulse Width Modulation) with locking inside can realize current limitation one by one;
(4) The power transistor has totem pole output, can provide a driving current of up to 1A, and a driving loop consisting of R10 and R20 directly drives the MOSFET power transistor Q2. The starting circuit composed of R5 and D5 has the function of realizing self-starting power supply of the power supply chip U1. An auxiliary power supply circuit consisting of D7, CD3 and C12 realizes normal work and power supply of the power supply chip U1.
In order to prolong the hiccup protection time during short circuit and improve the short circuit protection effect, the controllable circuit 101 of the overcurrent protection time consists of D6, R7, C10, R8 and Q1, and the working principle is as follows:
when the power supply chip works normally, the node voltage V REF At 5V, Q1 gate-source voltage Vgs =4.3V after D6; at the moment, Q1 is conducted, the anode of D5 is pulled down to be close to 0V, at the moment, D5 is reversely biased, and no current flows through D5;
when a short circuit occurs, the voltage of the auxiliary power supply circuit is reduced within the short circuit duration time, power cannot be supplied to the power supply chip U1, the power supply chip U1 consumes energy stored by the capacitor CD3, and when the voltage of the CD3 is lower than the lower limit working voltage of the power supply chip U1, the power supply chip U1 is protected and stops working;
after the power supply chip U1 stops working, V REF The point voltage is 0V, and the capacitor C10 discharges through R8; when the voltage of the C10 is lower than the starting voltage Vth of the Q1, the Q1 is closed, then the D5 is turned to be conducted in the forward direction, the capacitor CD3 is charged through the starting resistor R5, and when the charging voltage reaches the starting voltage of the power supply chip U1, the power supply chip U1 is started again.
The short circuit duration is the time from the beginning of the short circuit to the reduction of the voltage of the capacitor CD3 to the lower limit working voltage of the U1, and the duration depends on the working voltage and the CD2 capacity in normal working and the power consumption of the U1 chip.
The hiccup protection time at short circuit comprises a first start-up time t 1 And a second start-up time t 2 The first starting time t 1 The second starting time t is the time when the capacitor C10 is discharged to a voltage lower than the Q1 turn-on voltage through R8 2 The capacitor CD3 is charged to the time of the U1 chip start voltage for the start resistor.
The primary side current sampling circuit consists of R19, R14 and C16, wherein R19 is a current sampling resistor;
z1 in the overvoltage detection circuit 201 plays an overvoltage protection role, when the output voltage becomes high, the voltage of an auxiliary power supply winding is also increased, so that the voltage of a capacitor CD3 is increased, when the voltage exceeds Vz of a voltage regulator tube, Z1 is conducted, the output power is limited, when the voltage exceeds Vz + 1V, the voltage of a pin 3 of a U1 chip exceeds 1V, the output PWM of the U1 chip is stopped, and the output voltage is limited.
The RCD absorption loop is composed of R2, C6 and D3, when Q2 is switched off, part of energy coupled in the primary current is transferred to the secondary output, and part of energy in the leakage inductance is absorbed by the RCD loop to prevent high voltage from breaking down the MOS transistor Q2.
The isolation feedback circuit comprises an optical coupler device PC1 and a voltage reference chip U3, when the output voltage rises, the voltage divided by resistors R16 and R22 is connected to the voltage rise of a reference input end (a reverse input end of an error amplifier) of a voltage stabilizing diode U3 (wherein the voltage stabilizing diode U3 adopts a voltage stabilizing device TL 431), and compared with the reference voltage 2.5V inside the voltage stabilizing diode U3, the voltage Vka between the cathode and the anode of the U3 is reduced, the current If of a light emitting diode in the optical coupler device is increased, so that the dynamic resistance of a collector and an emitter of the optical coupler is reduced, the voltage between the collector and the emitter is reduced, the level of a pin 1 of the U1 is reduced, an output pulse is narrowed, the conduction time of the MOSFET power tube is shortened, the energy transmitted to a secondary winding of the T1 is reduced, and the output voltage Vo is reduced. Vice versa, the total effect is to make the output voltage keep constant, not influenced by the grid voltage or load change, has reached the purpose of realizing output closed-loop control.
The switch converter adopts a flyback switch transformer T1, a primary winding NP1-2 consisting of 9-7 pins of the flyback switch transformer T1, and 4 groups of secondary windings;
the first secondary winding consists of 4-2 pins of a flyback switching transformer T1, and the first path of rectifying and filtering circuit connected with the first secondary winding comprises a rectifying and filtering loop consisting of D1, CD1, C2, L2, C3 and C4 and an RC absorption loop consisting of R1 and C1; the output of the first path of rectifying and filtering circuit is power VCC and GND;
the second secondary winding consists of 5-6 pins of a flyback switching transformer T1, and the second path of rectification filter circuit connected with the second secondary winding comprises a rectification filter loop consisting of D4, CD2 and C9; the output of the second path of rectifying and filtering circuit is power supply 24V and COM;
the third secondary winding NP2-2 consists of pins 10-11 of a flyback switching transformer T1, and a third rectifying and filtering circuit connected with the third secondary winding NP2-2 comprises rectifying and filtering circuits of two branches, namely a first branch rectifying and filtering circuit consisting of D8, CD4 and C11 and a second branch rectifying and filtering circuit consisting of D7, CD3 and C12; and the output of the first branch rectifying and filtering circuit in the third branch rectifying and filtering circuit is an IGBT driving power supply F16.5V and DCN, and the output of the second branch rectifying and filtering circuit is an auxiliary power supply winding VC15 and DCN.
The winding and the two branches enable the functions of the two power supply branches to be independent and not interfered with each other. In addition, the overvoltage detection circuit 201 of the auxiliary power supply branch actually detects the winding voltage, when the second branch rectifying and filtering circuit generates overvoltage (namely, the VC15 branch and the DCN branch), because the branches of the IGBT driving power supplies F16.5V and DCN and the branches share the same winding, the first branch rectifying and filtering circuit (namely, the other branch F16.5V and DCN of the winding) also generates overvoltage inevitably, so that the branches of the IGBT driving power supplies F16.5V and DCN also have an overvoltage detection function, the overvoltage state of the IGBT driving power supplies can be effectively prevented, and the IGBT is prevented from being damaged due to overhigh driving voltage.
The fourth secondary winding consists of a pin 2-1 of a flyback switching transformer T1, and a fourth rectifying and filtering circuit connected with the fourth secondary winding comprises a forward rectifying and filtering loop consisting of D2 and C7; the output of the fourth rectifying and filtering circuit is connected with the bus voltage detection and voltage division unit 301 (i.e. the fourth secondary winding is a bus voltage acquisition winding);
the bus voltage detection voltage division unit 301 is composed of R3, R4, R6, and C8; the bus voltage is obtained as follows:
forward rectified voltage V dc1 (i.e., the voltage across C7) satisfies the following equation:
wherein; np represents the number of turns of the primary side of the switching transformer, ns represents the number of turns of the voltage acquisition winding of the switching transformer;
the voltage VDC (i.e., the voltage across C8) satisfies the following equation:
voltage VDC and bus voltage V bus Satisfies the following relation:
bus voltage V bus The calculation formula of (a) is as follows:
wherein R3, R4 and R6 are resistors in the bus voltage detection voltage division unit; v d The voltage drop of the diode is 0.7V; np represents the number of turns of the primary side of the switching transformer, ns represents the number of turns of the voltage acquisition winding of the switching transformer; VDC is the divided voltage of the forward rectified voltage.
Fig. 3 is a schematic circuit diagram of a voltage follower. The signal conditioning output of the analog quantity VDC is performed to an ADC interface of the CPU to complete sampling, and the circuit consists of R17, C20, C13, R18, C18 and D9.
In summary, the overcurrent and overvoltage protection of the switching power supply of the servo driver is realized by adding the overcurrent time controllable circuit in the primary side control circuit and driving the overvoltage detection circuit by the IGBT, so that the safety of the product is greatly enhanced; meanwhile, the bus voltage magnetic isolation detection technology is used for realizing the bus voltage detection with high precision and low cost.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the present application has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (10)
1. A servo driver multi-output power supply device is characterized by comprising a rectifying unit, a filtering unit, a switch converter, a control circuit, a rectifying and filtering circuit group, an isolation feedback circuit, an overcurrent protection time controllable circuit, an overvoltage detection circuit, a bus voltage detection and voltage division unit and a signal conditioning unit, wherein the rectifying unit is connected with the filtering unit;
the rectifying unit is connected with the filtering unit, and the alternating current input passes through the rectifying unit and then is input into the filtering unit;
the filtering unit is respectively connected with the primary side of the switch converter, the control circuit and the overcurrent protection time controllable circuit and is used for carrying out smooth filtering on the rectified alternating current input to obtain a smooth alternating current input direct current voltage;
the control circuit is respectively connected with the switch converter, the overcurrent protection time controllable circuit, the overvoltage detection circuit and the isolation feedback circuit and is used for adjusting and controlling the switch converter in a PWM (pulse width modulation) mode according to the feedback input of the isolation feedback circuit so as to stabilize the output voltage of the rectification filter circuit group;
the rectification filter circuit group consists of 4 paths of rectification filter circuits, each path of rectification filter circuit comprises an output rectification circuit and an output filter circuit which are connected in series, and the output rectification circuit is connected with the secondary winding of the switch converter and is used for smoothing each path of output of the secondary winding of the switch converter to obtain multiple paths of smooth direct-current voltages;
the isolation feedback circuit feeds back and outputs one path of smooth direct current voltage output by the rectification filter circuit group to the control circuit;
the output ends of the overvoltage detection circuit and the overcurrent protection time controllable circuit are respectively connected with the control circuit, the input end of the overvoltage detection circuit is connected with the primary side of the switch converter, the input end of the overcurrent protection time controllable circuit is connected with the output end of the filter unit, and the overvoltage detection circuit and the overcurrent protection time controllable circuit are used for providing overvoltage and overcurrent protection for the primary side of the switch converter.
2. The power supply device of claim 1, wherein one output of the rectifying and filtering circuit group is sequentially connected to the bus voltage detection voltage division unit and the signal conditioning unit, and is finally output to an ADC port of the CPU, so as to realize bus voltage acquisition.
3. The power supply device according to one of claims 1 or 2, wherein the switching converter employs a flyback switching transformer T1, and 9-7 pins of the flyback switching transformer T1 constitute a primary winding, and 4 sets of secondary windings are provided.
4. The power supply device according to claim 3, wherein the first secondary winding is composed of pins 4-2 of a flyback switching transformer T1, and the first path of rectifying and filtering circuit connected with the first secondary winding comprises a rectifying and filtering loop composed of D1, CD1, C2, L2, C3 and C4, and an RC absorption loop composed of R1 and C1.
5. The power supply device according to claim 4, wherein the output of the first path rectifying and filtering circuit is power supply VCC, GND.
6. The device of claim 3, wherein the second secondary winding is composed of pins 5-6 of a flyback switching transformer T1, and the second path of rectifying and filtering circuit connected with the second secondary winding comprises a rectifying and filtering loop composed of D4, CD2 and C9.
7. The power supply device according to claim 6, wherein the output of the second path of rectifying and filtering circuit is power supply 24V, COM.
8. The power supply device according to claim 3, wherein the third secondary winding is composed of pins 10-11 of the flyback switching transformer T1, and the third rectifying and filtering circuit connected thereto includes two branches of rectifying and filtering circuits, a first branch of rectifying and filtering circuit composed of D8, CD4, and C11, and a second branch of rectifying and filtering circuit composed of D7, CD3, and C12.
9. The power supply device according to claim 8, wherein the output of the first branch rectifying and filtering circuit in the third branch rectifying and filtering circuit is an IGBT driving power supply f16.5v, DCN, and the output of the second branch rectifying and filtering circuit is an auxiliary power supply winding VC15, DCN.
10. The power supply device according to claim 3, wherein the fourth secondary winding is composed of a pin 2-1 of a flyback switching transformer T1, and the fourth rectifying and filtering circuit connected with the fourth secondary winding comprises a forward rectifying and filtering loop composed of D2 and C7; and the output of the fourth path of rectifying and filtering circuit is connected with the bus voltage detection and voltage division unit.
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| JP2000270549A (en) * | 1999-03-17 | 2000-09-29 | Fuji Elelctrochem Co Ltd | Switching power supply unit with protective circuit |
| WO2002075909A1 (en) * | 2001-03-19 | 2002-09-26 | Fujitsu Limited | Multiple power supply, and method and apparatus for overcurrent protection of multiple power supply |
| CN2834005Y (en) * | 2005-09-09 | 2006-11-01 | 瑞谷科技(深圳)有限公司 | Multi-way output power supply for communication system |
| CN207910676U (en) * | 2017-12-30 | 2018-09-25 | 天津信天电子科技有限公司 | A kind of multichannel servo-driver with over-voltage over-current protection function |
| CN208874475U (en) * | 2018-11-16 | 2019-05-17 | 广州科伺智能科技有限公司 | A kind of low tension switch power supply for servo-driver |
| CN111682772A (en) * | 2020-04-02 | 2020-09-18 | 上海航天控制技术研究所 | Multi-output switch power supply device of high-voltage servo controller |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9680383B2 (en) * | 2014-11-07 | 2017-06-13 | Power Integrations, Inc. | Input overvoltage protection using current limit |
| JP6578111B2 (en) * | 2015-03-05 | 2019-09-18 | ローム株式会社 | Insulated DC / DC converter and feedback circuit thereof, power supply using the same, power adapter, and electronic device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000270549A (en) * | 1999-03-17 | 2000-09-29 | Fuji Elelctrochem Co Ltd | Switching power supply unit with protective circuit |
| WO2002075909A1 (en) * | 2001-03-19 | 2002-09-26 | Fujitsu Limited | Multiple power supply, and method and apparatus for overcurrent protection of multiple power supply |
| CN2834005Y (en) * | 2005-09-09 | 2006-11-01 | 瑞谷科技(深圳)有限公司 | Multi-way output power supply for communication system |
| CN207910676U (en) * | 2017-12-30 | 2018-09-25 | 天津信天电子科技有限公司 | A kind of multichannel servo-driver with over-voltage over-current protection function |
| CN208874475U (en) * | 2018-11-16 | 2019-05-17 | 广州科伺智能科技有限公司 | A kind of low tension switch power supply for servo-driver |
| CN111682772A (en) * | 2020-04-02 | 2020-09-18 | 上海航天控制技术研究所 | Multi-output switch power supply device of high-voltage servo controller |
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| CN115528901A (en) | 2022-12-27 |
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