CN211791308U - High-voltage position finding circuit and device based on flyback switching power supply and welding robot - Google Patents
High-voltage position finding circuit and device based on flyback switching power supply and welding robot Download PDFInfo
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- CN211791308U CN211791308U CN202020381503.9U CN202020381503U CN211791308U CN 211791308 U CN211791308 U CN 211791308U CN 202020381503 U CN202020381503 U CN 202020381503U CN 211791308 U CN211791308 U CN 211791308U
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Abstract
The utility model provides a flyback switching power supply-based high-voltage position finding circuit, a device and a welding robot, which relate to the technical field of welding robots and solve the problem that the position finding voltage of the existing contact position finding device is not appropriate, and the flyback switching power supply-based high-voltage position finding circuit comprises a rectifying circuit, a control circuit, a feedback circuit and a switching circuit; the input end of the rectifying circuit is an external alternating current power supply, and the output end of the rectifying circuit is connected with the input end of the control circuit; the output end of the control circuit is respectively connected with the input ends of the switch circuit and the feedback circuit; the output end of the feedback circuit is connected with the input end of the control circuit and is used for detecting the deviation of the output voltage and a set value and a fault signal of the control circuit and feeding back the deviation value and/or the fault signal to the control circuit; the input end of the switch circuit is an external given locating control signal, and the output end of the switch circuit is connected with the anode and the cathode of the welding robot; the utility model discloses an adjust the divider resistance value among the feedback circuit, the effectual success rate of seeking of welding robot of having guaranteed.
Description
Technical Field
The utility model relates to a welding robot technical field, in particular to high pressure seeks position circuit, device and welding robot based on turn-back switch power supply.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
In an automated welding application, a welding robot is often required to perform a welding operation on a workpiece having a large dimensional deviation. In order to avoid repeated programming positioning, a robot is required to automatically identify the position of a welding seam of a workpiece, and a common solution is to use a contact type position finding device.
However, the inventor of the present invention finds that the conventional contact type locating device has the following disadvantages: (1) the level value of the locating voltage is not proper, the voltage of most locating devices is less than 50V, and the locating effect is poor when oil stains or corrosion on the surface of a workpiece is serious; the voltage of a few of the position searching devices exceeds 200V and exceeds a safe voltage amplitude limit value, and the safety is insufficient; (2) the locating speed is insufficient, the locating frequency of most locating devices is lower than 10Hz, and the requirement of rapid automatic welding is difficult to meet.
Disclosure of Invention
In order to solve the not enough of prior art, the utility model provides a high pressure seeks position circuit, device and welding robot based on turn-back switching power supply seeks the partial pressure resistance value of feedback circuit among the position device through the regulation, can set for final output and give the outside signal amplitude of seeking, satisfies the application demand of different occasions, and practical function is showing, the effectual success rate of seeking of guaranteeing welding robot.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model discloses the first aspect provides a position circuit is sought to high pressure based on flyback switching power supply.
A high-voltage position finding circuit based on a flyback switching power supply comprises a rectifying circuit, a control circuit, a feedback circuit and a switching circuit;
the input end of the rectifying circuit is an external alternating current power supply and is used for converting external alternating current into direct current, and the output end of the rectifying circuit is connected with the input end of the control circuit;
the output end of the control circuit is respectively connected with the input ends of the switch circuit and the feedback circuit, and the control circuit is used for converting the input direct current into direct current with the amplitude value as a set value;
the output end of the feedback circuit is connected with the input end of the control circuit and is used for detecting the deviation of the output voltage and a set value and a fault signal of the control circuit and feeding back the deviation value and/or the fault signal to the control circuit;
the input end of the switch circuit is an external given locating control signal, and the output end of the switch circuit is connected with the anode and the cathode of the welding robot.
The utility model discloses the second aspect provides a position device is sought to high pressure based on turn-back switch power supply, include the utility model discloses the first aspect high pressure based on turn-back switch power supply seek position circuit.
The utility model discloses the third aspect provides a welding robot, include the first aspect high pressure based on turn-back switch power supply seek the position circuit.
The utility model discloses the fourth aspect provides a welding robot, include the utility model discloses the second aspect high pressure based on turn-back switch power supply seek the position device.
Compared with the prior art, the beneficial effects of the utility model are that:
1. high pressure seek position circuit and device can be applied to multiple welding robot in, through the divider resistance value among the regulation feedback circuit, can set for final output and give outside signal amplitude of seeking, satisfy the application demand of different occasions.
2. High pressure seek bit circuit and device, all have better adaptability to the input power supply of wide range, small, easily extensive application in batches.
3. High pressure seek position circuit and device, it is fast to seek a position, practical effect is showing, the effectual success rate of seeking of guaranteeing welding robot.
Drawings
Fig. 1 is the utility model discloses embodiment 1 provides a structural schematic diagram of a high pressure circuit of seeking based on flyback switching power supply.
Fig. 2 is a schematic diagram of a high-voltage bit seeking circuit based on a flyback switching power supply provided in embodiment 1 of the present invention.
1. A rectifying circuit; 2. a control circuit; 3. a feedback circuit; 4. a switching circuit; 11. a rectifier bridge; 12. a filter capacitor; 21 a charging resistor; 22. a charging capacitor; a follow current resistor 23; 24. a freewheeling diode; 25. a power supply diode; 26. a high-frequency transformer; 27. a pulse generating chip; 28. a switching tube; 29. an overcurrent detection resistor; 32. a linear optical coupler; 33. an adjustable reference voltage chip; 34. a voltage dividing resistor; 41. a diode; 42. a relay; 43. a light emitting diode.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and further it is to be understood that when the terms "comprises" and "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, devices, components and combinations thereof.
The embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Example 1:
as shown in fig. 1, the embodiment 1 of the present invention provides a high voltage position finding circuit based on a flyback switching power supply, which includes a rectification circuit 1, a control circuit 2, a feedback circuit 3 and a switch circuit 4. The input end of the rectification circuit 1 is an external alternating current power supply, and the output end is connected with the input end of the control circuit 2; the rectifier circuit 1 is used to convert an external alternating current into a direct current.
The output end of the control circuit 2 is connected with the input ends of the switch circuit 4 and the feedback circuit 3, and is used for converting the input direct current into direct current with the amplitude value as a set value.
The output end of the feedback circuit 3 is connected with the input end of the control circuit 2, and is used for detecting the deviation of the output voltage and a set value and a fault signal of the control circuit and timely adjusting the output of the control circuit 2. Meanwhile, the feedback circuit 3 can send a fault signal to the control circuit 2 when an overcurrent fault occurs in the control circuit 2, thereby shutting down the output of the control circuit 2. The input end of the switch circuit 4 is a given seeking control signal from the outside, and the output end is connected with the outside.
As shown in fig. 2, which is a schematic circuit diagram of an embodiment of the present invention, an input ac power in the rectifier circuit 1 is converted into an approximate dc power by the rectification function of the rectifier bridge 11; then the voltage is converted into direct current through the filtering action of a filtering capacitor 12, and the voltage value of the direct current is input alternating current
And (4) doubling.
In this embodiment, the rectifier bridge may also be a single rectifier bridge component, or here, may also be a combination of four rectifier diodes. The withstand voltage value of the filter capacitor needs to be approximate to or more than 2 times of the input voltage value of the rectifying circuit, and the capacity of the filter capacitor needs to be large enough.
The control circuit 2 comprises a charging resistor 21, a charging capacitor 22, a freewheeling resistor 23, a freewheeling diode 24, a power supply diode 25, a high-frequency transformer 26, a pulse generation chip 27, a switching tube 28 and an overcurrent detection resistor 29; the pulse generation chip selects UCx84y (x and y are 2 or 3), and the voltage resistance value of the switching tube needs to be close to or more than 2 times of the input voltage value of the rectifying circuit. The frequency of the high-frequency transformer needs to be larger than the output pulse frequency of the pulse generation chip, and the wire diameter of an enameled wire of a primary winding of the transformer needs to be large enough to ensure that the transformer can work normally when the pulse generation chip outputs the maximum duty ratio.
The feedback circuit 3 is composed of a linear optocoupler 32, an adjustable reference voltage chip 33, a voltage dividing resistor 34, a sampling resistor and a capacitor, the linear optocoupler is selected from a PC817 or other linear optocouplers, and the adjustable reference voltage chip is selected from a TL 431. The sampling resistor is a high-power low-value resistor so as to ensure that the sampling resistor is not damaged when the pulse generation chip outputs the maximum duty ratio.
The switch circuit is composed of a relay 42, a diode 41, a light emitting diode 43 and a resistor, the withstand voltage value of the auxiliary contact of the relay is ensured to be more than 2 times of the output voltage value of the control circuit, and the switching frequency of the relay is ensured to be more than 5 times or more of the external locating control signal frequency.
When an external alternating current power supply is connected to the input, the alternating current is converted into a voltage value through a rectifying circuit
Double direct current. Part of the direct current is used for supplying power to the pulse generation chip, and part of the direct current is used for charging energy to the primary side of the high-frequency transformer. Along with the switching-on and switching-off of the pulse generation chip control switching tube with certain frequency and variable duty ratio, the energy of the primary side of the high-frequency transformer is transmitted to the switching circuit connected to the secondary side with the same frequency.
The frequency of the output signal of the pulse generating chip is determined by the resistance and the capacitance connected at the pin 4 of the pulse generating chip.
In the position searching device, the power supply of the pulse generating chip is provided by a capacitor. In the starting stage of the pulse generating chip, the output of the rectifying circuit charges the capacitor; in the working stage of the pulse generating chip, the secondary side of the high-frequency transformer outputs the pulse generating chip to charge the capacitor.
When a locating control signal is given, a relay coil of the switch circuit is electrified, the auxiliary contact of the relay is attracted under the action of electromagnetic force, and the output end of the control circuit is connected to the outside. Meanwhile, the light emitting diode is conducted to emit bright light to indicate that the position searching is started.
A diode is added between the switch circuit and the control circuit, and the control circuit is not damaged by external high voltage when a position searching control signal is given.
The specific working mode is as follows:
the output of the rectifier circuit 1 passes through a charging resistor 21 in the control circuit 2 to charge a charging capacitor 22, and the voltage thereof is gradually increased. When the voltage value of the charging capacitor 22 is higher than 16V, the pulse generating chip 27 changes from a stop state to a start state, and outputs a pulse control signal with a certain duty ratio at the pin 6 to drive the switching tube 28 to be switched on and off.
When the switch tube 28 is turned on, the output of the rectification circuit 1 passes through the primary winding of the high-frequency transformer 26 and the switch tube 28 to form a loop and store energy in the primary winding of the high-frequency transformer 26. When the switch tube 28 is turned off, the output of the rectification circuit 1 passes through the primary winding of the high-frequency transformer 26, the freewheeling resistor 23 and the freewheeling diode 24 to form a loop and transfer the energy in the primary winding of the high-frequency transformer 26 to the secondary winding.
When the voltage value of the voltage dividing resistor 34 of the feedback circuit 3 is higher than a set value, the current flowing through the adjustable reference voltage chip 33 is increased, that is, the primary side current of the linear optocoupler 32 is increased, so that the secondary side current of the linear optocoupler 32 is increased in proportion, and the voltage value at the pin 1 of the pulse generation chip 27 in the switch circuit 2 is reduced, so that the duty ratio of the pulse control signal output by the pin 6 is reduced, and finally the output voltage is reduced; when the voltage value of the voltage-dividing resistor 34 of the feedback circuit 3 is lower than a set value, the current flowing through the adjustable reference voltage chip 33 is reduced, that is, the primary side current of the linear optocoupler 32 is reduced, so that the secondary side current of the linear optocoupler 32 is proportionally reduced, and the voltage value at the pin 1 of the pulse generation chip 27 in the switch circuit 2 is increased, so that the duty ratio of the pulse control signal output by the pin 6 is increased, and finally the output voltage is increased. The adjusting mode can ensure that the error between the output voltage value and the set value is small and can be considered equal.
When the pulse generating chip 27 in the control circuit 2 fails, the switching tube 27 is continuously turned on, and the voltage value of the over-current detection resistor 31 is continuously higher than 1V, so that the voltage value at the pin 3 of the pulse generating chip 27 is higher than the threshold value, which causes the pulse generating chip 27 to close the output, thereby protecting the circuit from being damaged.
The switch circuit 4 inputs a seek control signal given from the outside and an output of the control circuit 2, and an output terminal is connected to the outside. When a seek control signal is given, a current flows through the coil of the relay 42, so that the auxiliary contact of the relay 42 is closed, and the output of the control circuit 2 is connected to the outside; when the seek control signal is turned off, no current flows in the coil of the relay 42, the auxiliary contact is opened, and the output of the control circuit 2 is disconnected from the outside. The switch circuit 4 is added with a light emitting diode 43, when a seek control signal is provided, the light emitting diode 43 is conducted and emits light, indicating that seek is started.
It is thus clear that through the explanation, the utility model provides a high pressure is sought a device for welding robot based on turn-back switching power supply is applied to welding robot, can adjust in a flexible way and seek a magnitude of voltage to whether accessible signal control seeks a position. The position searching device based on the flyback switching power supply has the characteristics of small volume and high position searching speed, and is easy to widely apply in batches.
Example 2:
the embodiment 2 of the utility model provides a position device is sought to high pressure based on flyback switching power supply, include the utility model discloses embodiment 1 a position circuit is sought to high pressure based on flyback switching power supply.
Example 3:
the embodiment 3 of the utility model provides a welding robot, include the utility model discloses embodiment 1 high pressure based on flyback switching power supply seek position circuit.
Example 4:
the embodiment 4 of the utility model provides a welding robot, include the utility model discloses embodiment 2 high pressure based on flyback switching power supply seek the position device.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A high-voltage position finding circuit based on a flyback switching power supply is characterized by comprising a rectifying circuit, a control circuit, a feedback circuit and a switching circuit;
the input end of the rectifying circuit is an external alternating current power supply and is used for converting external alternating current into direct current, and the output end of the rectifying circuit is connected with the input end of the control circuit;
the output end of the control circuit is respectively connected with the input ends of the switch circuit and the feedback circuit, and the control circuit is used for converting the input direct current into direct current with the amplitude value as a set value;
the output end of the feedback circuit is connected with the input end of the control circuit and is used for detecting the deviation of the output voltage and a set value and a fault signal of the control circuit and feeding back the deviation value and/or the fault signal to the control circuit;
the input end of the switch circuit is an external given locating control signal, and the output end of the switch circuit is connected with the anode and the cathode of the welding robot.
2. The flyback switching power supply-based high-voltage position-finding circuit as claimed in claim 1, wherein the rectifying circuit comprises a rectifying bridge and a filter capacitor, and the alternating current power supply is converted into direct current after passing through the rectifying bridge and the filter capacitor in sequence.
3. The flyback switching power supply-based high-voltage bit-seeking circuit of claim 2, wherein the control circuit comprises a first resistor, a second resistor, a third resistor, a first capacitor, a first diode, a pulse generation chip, a switching tube and a transformer;
the direct current output by the rectifying circuit passes through a first resistor and then charges a first capacitor, and the positive end of the first capacitor is connected with the power supply port of the pulse generation chip;
the signal output end of the pulse generation chip is connected with the first end of a switching tube, the second end of the switching tube is connected with the first end of a primary coil of a transformer, and the third end of the switching tube is grounded through a second resistor;
the direct current output by the rectifying circuit is connected to the second end of the transformer, and the first end of the primary coil is connected to the second end of the transformer after passing through the first diode and the third resistor in sequence;
when the switching tube is conducted, the output of the rectifying circuit passes through the primary coil of the transformer and the switching tube to form a loop and store energy in the primary coil of the transformer;
when the switching tube is turned off, the output of the rectifying circuit passes through the primary coil of the transformer, the third resistor and the first diode to form a loop and transmit the energy in the primary coil of the transformer to the secondary side.
4. The flyback switching power supply-based high-voltage position-finding circuit as claimed in claim 3, wherein the feedback circuit comprises a fourth resistor, a voltage reference chip and a linear optocoupler, the output terminal of the transformer is connected to the first terminal of the voltage reference chip through the fourth resistor, the second terminal of the voltage reference chip is connected to the primary winding of the linear optocoupler, and the secondary winding of the linear optocoupler is connected to the signal input port.
5. The flyback switching power supply-based high-voltage bit-seeking circuit as claimed in claim 3, wherein an end of the second resistor far away from the ground is connected to a protection port of the pulse generation chip;
when the pulse generation chip breaks down, the switching tube is continuously conducted, the voltage value of the second resistor is continuously higher than the preset value, so that the voltage value of the protection port of the pulse generation chip is higher than the threshold value, and the pulse generation chip is closed to output.
6. The flyback switching power supply-based high-voltage position finding circuit as claimed in claim 3, wherein the switching circuit comprises a relay, the position finding control signal is connected to an input end of the relay, when the position finding control signal is given, current flows through a coil of the relay, an auxiliary contact of the relay is closed, and an output of the control circuit is connected with a positive electrode and a negative electrode of the welding robot; when the position-finding control signal is disconnected, no current flows in a coil of the relay, the auxiliary contact is opened, and the output of the control circuit is disconnected with the positive electrode and the negative electrode of the welding robot.
7. The flyback switching power supply-based high voltage seek circuit according to claim 6, wherein the switching circuit further comprises a second diode, the seek control signal is connected to the positive terminal of the second diode, the negative terminal of the second diode is connected to the negative terminal of the relay through a voltage dividing resistor, and when the seek control signal is asserted, the second diode is turned on and emits light to indicate that seek is started.
8. The flyback switching power supply based high-voltage seek circuit of claim 1, wherein a third diode is connected between the switching circuit and the control circuit for preventing the control circuit from being damaged by an external high voltage when a seek control signal is given.
9. A flyback switching power supply-based high-voltage position finding device is characterized by comprising the flyback switching power supply-based high-voltage position finding circuit as claimed in any one of claims 1 to 8.
10. A welding robot is characterized by comprising a high-voltage position finding circuit based on a flyback switching power supply, wherein the high-voltage position finding circuit is as claimed in any one of claims 1 to 8;
or, include the flyback switching power supply based high-voltage seek position device of claim 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020381503.9U CN211791308U (en) | 2020-03-20 | 2020-03-20 | High-voltage position finding circuit and device based on flyback switching power supply and welding robot |
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| CN202020381503.9U CN211791308U (en) | 2020-03-20 | 2020-03-20 | High-voltage position finding circuit and device based on flyback switching power supply and welding robot |
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| CN211791308U true CN211791308U (en) | 2020-10-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112453646A (en) * | 2020-12-07 | 2021-03-09 | 上海沪工焊接集团股份有限公司 | Position finding detection method and device, storage medium and electronic equipment |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112453646A (en) * | 2020-12-07 | 2021-03-09 | 上海沪工焊接集团股份有限公司 | Position finding detection method and device, storage medium and electronic equipment |
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