CN202240075U - No-load voltage amplitude-limiting pressure-stabilizing circuit of DC (Direct Current) electric welding machine - Google Patents
No-load voltage amplitude-limiting pressure-stabilizing circuit of DC (Direct Current) electric welding machine Download PDFInfo
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- CN202240075U CN202240075U CN201120278716XU CN201120278716U CN202240075U CN 202240075 U CN202240075 U CN 202240075U CN 201120278716X U CN201120278716X U CN 201120278716XU CN 201120278716 U CN201120278716 U CN 201120278716U CN 202240075 U CN202240075 U CN 202240075U
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Abstract
The utility model provides a no-load voltage amplitude-limiting pressure-stabilizing circuit of a DC (Direct Current) electric welding machine, comprising a no-load voltage sampling circuit, a no-load voltage feedback circuit and a no-load voltage control circuit. The no-load voltage sampling circuit samples a no-load voltage output valve output by an electric welding machine in real time, and the no-load voltage output valve is subjected to resistance-capacitance filtering, voltage reduction and linear optical isolation to form filtering sampling signals which are transmitted to a no-load voltage feedback circuit; the no-load voltage feedback circuit is connected with the no-load voltage sampling circuit, and conducts amplitude process on the filtering sampling signals output by the no-load voltage sampling circuit to obtain no-load voltage feedback values which are transmitted to the no-load voltage control circuit in a negative feedback way; and the no-load voltage control circuit is connected with the no-load voltage feedback circuit, and controls a PWM (Pulse Width Modulation) circuit according to the difference between a no-load set value and the no-load voltage feedback value. The no-load voltage amplitude-limiting pressure-stabilizing circuit changes the duty ratio of the on and the off of a power device to obtain a stable no-load output voltage value, and guarantees the good consistency of the no-load voltage of the electric welding machine.
Description
Technical field
The utility model relates to mu balanced circuit, relates in particular to dc welding machine floating voltage amplitude limit mu balanced circuit.
Background technology
The working environment of electric welding machine is more abominable; In present dc welding machine product; The problem ubiquity that floating voltage instability and different electric welding machine differences are bigger, especially fluctuation also can appear in floating voltage thereupon when fluctuation takes place dispatch from foreign news agency, and the electric welding machine performance is affected.
The utility model content
In order to solve the stability problem of unloaded output voltage values, the utility model proposes dc welding machine floating voltage amplitude limit mu balanced circuit.
The utility model proposes dc welding machine floating voltage amplitude limit mu balanced circuit, it is characterized in that, comprising:
The floating voltage sampling circuit, the floating voltage output valve of real-time sampling electric welding machine output through capacitance-resistance filter, step-down, again through linear light-coupled isolation, forms it filtering sampling signal and passes to the floating voltage backfeed loop;
The floating voltage backfeed loop is connected with the floating voltage sampling circuit, the filtering sampling signal of its output is carried out amplitude handle, and obtains the floating voltage value of feedback, sends this value of feedback to the floating voltage control loop with negative feedback type;
The floating voltage control loop is connected with the floating voltage backfeed loop, according to the difference control PWM control loop of floating voltage set-point and floating voltage value of feedback.
Further, said dc welding machine floating voltage amplitude limit mu balanced circuit is characterized in that the floating voltage control loop comprises:
The voltage feedback signal of the 18 resistance one termination floating voltage backfeed loop; 5 pin of another termination second integrated transporting discharging of the 18 resistance and the 3rd electric capacity one end; The 3rd electric capacity other end ground connection; 6 pin of second integrated transporting discharging and 7 pin of second integrated transporting discharging connect and compose follower, and the output of second integrated transporting discharging is that 7 pin of IC1 connect the 20 resistance one end, another termination the 21 resistance one end of the 20 resistance, the 25 resistance one end and the 4th electric capacity one end; The 25 resistance other end and the 4th electric capacity other end ground connection, 10 pin of another termination the 3rd integrated transporting discharging of the 21 resistance;
The 22 resistance one termination floating voltage set-point; 9 pin of another termination the 23 resistance one end of the 22 resistance, the 5th electric capacity one end and the 3rd integrated transporting discharging; 8 pin of the 23 resistance other end, another termination the 3rd integrated transporting discharging of the 5th electric capacity and the 24 resistance one end; The 24 resistance another termination the 6th electric capacity one end and first diode anode, the 6th electric capacity other end ground connection, first diode cathode connects the PWM control loop.
Further; Said dc welding machine floating voltage amplitude limit mu balanced circuit; It is characterized in that the floating voltage set-point is through the 19 resistance and the second potentiometer setting, 1 pin of the 19 resistance one termination+5V, another termination second potentiometer of the 19 resistance; 3 pin ground connection of second potentiometer, 2 pin of second potentiometer connect the 19 resistance one end.
Further, said dc welding machine floating voltage amplitude limit mu balanced circuit is characterized in that the floating voltage sampling circuit comprises:
The positive pole of electric welding machine output is connected with an end of an end of the 30 resistance, the tenth electric capacity, first resistance, one end connects; The negative pole of output is connected with the 11 electric capacity one end, the 30 resistance other end, the tenth electric capacity other end; The 11 electric capacity other end is connected with casing; The first resistance other end is connected with an end of second resistance, an end and first electric capacity, one end of the 3rd resistance, the first electric capacity other end, the 3rd resistance other end ground connection, and the second resistance other end is connected with 3 pin and the first triode _ B of linear optical coupling; First triode _ C ground connection; First triode _ E connects an end of second triode _ B and the 4th resistance, and the 4th resistance other end is connected with 2 pin of+15V and linear optical coupling, and second triode _ C is connected with 1 pin of linear optical coupling; Second triode _ E is connected with the 5th resistance one end, 4 pin ground connection of the 5th resistance other end, linear optical coupling.
Further, said dc welding machine floating voltage amplitude limit mu balanced circuit is characterized in that the floating voltage backfeed loop comprises:
5 pin ground connection of linear optical coupling, 6 pin of linear optical coupling are connected with an end and the 3rd triode _ B of the 6th resistance, and the 3rd triode _ C ground connection, the 3rd triode _ E connect an end of the 4th triode _ B and the 7th resistance; Another termination+15V of the 7th resistance, the 4th triode _ E connect the 9th resistance one end, the 9th resistance other end ground connection; The 4th triode _ C connects the 6th resistance other end, the 8th resistance one end, the tenth resistance one end and second electric capacity, one end, another termination+15V of the 8th resistance, the second electric capacity other end ground connection; Another termination the 11 resistance one end of the tenth resistance, and the 14 resistance one end; 3 pin of another termination first potentiometer of the 11 resistance, 1 pin ground connection of first potentiometer, 3 pin of another termination the 15 resistance one end of the 14 resistance and first integrated transporting discharging; The 15 resistance other end ground connection; The 12 resistance one termination+15, another termination the 13 resistance one end, the 17 resistance one end, the 17 resistance other end ground connection, 2 pin of another termination the 16 resistance one end of the 13 resistance and first integrated transporting discharging; 1 pin of another termination first integrated transporting discharging of the 16 resistance, this current potential are through the adjusted voltage feedback signal of amplitude.
The utility model increases floating voltage amplitude limit mu balanced circuit in dc welding machine; This floating voltage amplitude limit mu balanced circuit real-time sampling floating voltage output valve; This output valve processing is obtained the floating voltage value of feedback; According to the difference control PWM control loop of floating voltage value of feedback and floating voltage set-point, realize closed-loop control to electric welder no-load voltage.The utility model has changed power device and has opened the dutycycle of shutoff, obtains stable unloaded output voltage values, guarantees the good uniformity of electric welder no-load voltage.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is further specified.
Fig. 1 is the theory diagram of the utility model dc welding machine floating voltage amplitude limit mu balanced circuit.
Fig. 2 is the circuit diagram of the utility model dc welding machine floating voltage amplitude limit mu balanced circuit.
The specific embodiment
Fig. 1 is the theory diagram of the utility model dc welding machine floating voltage amplitude limit mu balanced circuit; Dc welding machine floating voltage amplitude limit mu balanced circuit is closed-loop control, comprises floating voltage sampling circuit 1, floating voltage backfeed loop 2 and floating voltage control loop 3.
The floating voltage output valve of floating voltage sampling circuit 1 real-time sampling electric welding machine output through capacitance-resistance filter, step-down, again through linear light-coupled isolation, forms it filtering sampling signal and passes to floating voltage backfeed loop 2.The floating voltage output valve is isolated through linear optocoupler and floating voltage backfeed loop 2, floating voltage control loop 3, has improved the anti-interference ability of floating voltage sampling circuit 1.
Floating voltage backfeed loop 2 is connected with floating voltage sampling circuit 1, the filtering sampling signal of its output is carried out amplitude handle, and obtains the floating voltage value of feedback, sends this value of feedback to floating voltage control loop 3 with negative feedback type, the protection subsequent conditioning circuit.
Floating voltage control loop 3 uses integrated operational amplifier to build main control loop, and is reliable and stable, and response fast.Be connected with floating voltage backfeed loop 2, according to the difference control PWM control loop of floating voltage set-point and floating voltage value of feedback, the switch of PWM control loop control power device is realized the closed-loop control to electric welder no-load voltage.
In the utility model, the control of floating voltage output valve participation system has the ability of automatic correction or compensation, has improved control accuracy.Change power device and opened the dutycycle of shutoff, obtained stable floating voltage output valve, guaranteed the good uniformity of electric welder no-load voltage.
Below in conjunction with Fig. 2 the circuit diagram of the utility model embodiment is specified.
Floating voltage sampling circuit 1 comprises triode Q1, triode Q2, linear optical coupling PC1, resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 30, capacitor C 1, capacitor C 10 and capacitor C 11.
One end of the positive pole of electric welding machine output and resistance R 30, an end of capacitor C 10 are connected, resistance R 1 one ends connect, and the negative pole of output is connected with C11 one end, resistance R 30 other ends, capacitor C 10 other ends, and capacitor C 11 other ends are connected with casing.Resistance R 1 other end is connected with an end of resistance R 2, an end and capacitor C 1 one ends of resistance R 3; Capacitor C 1 other end, resistance R 3 other end ground connection; Resistance R 2 other ends are connected with 3 pin and the triode Q1_B of linear optical coupling PC1, triode Q1_C ground connection, and triode Q1_E connects an end of triode Q2_B and resistance R 4; Resistance R 4 other ends are connected with 2 pin of+15V and linear optical coupling PC1; Triode Q2_C is connected with 1 pin of linear optical coupling PC1, and triode Q2_E is connected with resistance R 5 one ends, the 4 pin ground connection of resistance R 5 other ends, linear optical coupling PC1.
Floating voltage backfeed loop 2 comprises resistance R 6～resistance R 17, triode Q3, triode Q4, VR1, capacitor C 2 and integrated transporting discharging IC1A.
The 5 pin ground connection of linear optical coupling PC1,6 pin of linear optical coupling PC1 are connected with an end and the triode Q3_B of resistance R 6, triode Q3_C ground connection, and triode Q3_E connects an end of triode Q4_B and resistance R 7; Resistance R 7 another termination+15V, triode Q4_E connecting resistance R9 one end, resistance R 9 other end ground connection; The triode Q4_C connecting resistance R6 other end, resistance R 8 one ends, resistance R 10 1 ends and capacitor C 2 one ends, resistance R 8 another termination+15V, capacitor C 2 other end ground connection; Resistance R 10 other end connecting resistance R11 one end, and resistance R 14 1 ends; 3 pin of resistance R 11 another termination potentiometer VR1, the 1 pin ground connection of VR1,3 pin of resistance R 14 other end connecting resistance R15 one ends and integrated transporting discharging IC1A; Resistance R 15 other end ground connection; Resistance R 12 1 terminations+15, other end connecting resistance R13 one end, resistance R 17 1 ends, resistance R 17 other end ground connection, 2 pin of resistance R 13 other end connecting resistance R16 one ends and integrated transporting discharging IC1A; 1 pin of resistance R 16 another termination integrated transporting discharging IC1A, this current potential is through the adjusted voltage feedback signal of amplitude (DYFK).
Floating voltage control loop 3 comprises resistance R 18, resistance R 20～resistance R 25, integrated transporting discharging IC1B, integrated transporting discharging IC1C, capacitor C 3～capacitor C 6, reaches diode D1.
Voltage feedback signal (DYFK) connecting resistance R18 one end; 5 pin and capacitor C 3 one ends of resistance R 18 another termination integrated transporting discharging IC1B; Capacitor C 3 other end ground connection; 6 pin of integrated transporting discharging IC1B and 7 pin of integrated transporting discharging IC1B connect and compose follower, and the output of integrated transporting discharging IC1B is 7 pin connecting resistance R20, one end of IC1, resistance R 20 other end connecting resistance R21 one end, resistance R 25 1 ends and capacitor C 4 one ends; Resistance R 25 other ends and capacitor C 4 other end ground connection, 10 pin of resistance R 21 another termination integrated transporting discharging IC1C.
1 pin of resistance R 19 1 terminations+5V, resistance R 19 another termination potentiometer VR2; The 3 pin ground connection of potentiometer VR2,2 pin connecting resistance R22, one end of potentiometer VR2,9 pin of resistance R 22 other end connecting resistance R23 one end, capacitor C 5 one ends and integrated transporting discharging IC1C; 8 pin and resistance R 24 1 ends of resistance R 23 other ends, capacitor C 5 another termination integrated transporting discharging IC1C; Resistance R 24 another termination capacitor C 6 one ends and diode D1 anodes, capacitor C 6 other end ground connection, diode D1 negative electrode connects the PWM control loop.
Through regulator potentiometer VR2 the floating voltage set-point is set, the DYFK signal carries out the difference computing with the floating voltage set-point behind follower, and the difference operation result is exported to the PWM control loop.When the floating voltage output valve departed from set-point, the PWM control loop will be according to the operation result of floating voltage control loop, and the stable of unloaded output voltage controlled in the output of adjustment PWM control loop.
Through regulator potentiometer VR2 the floating voltage set-point is set, can changes the comparative level value, to adapt to the different circuits requirement.Integrated transporting discharging is built follower and subtraction circuit, and is reliable and stable.
The utility model compares floating voltage value of feedback and floating voltage set-point to the closed-loop control of the floating voltage of electric welding machine, operation result is delivered to the feedback signal output pin of pwm chip UC3879.UC3879 judges according to the feedback signal of floating voltage backfeed loop whether the PWM ripple dutycycle of current output is reasonable, like the higher PWM ripple dutycycle exported of then reducing of floating voltage, otherwise like the floating voltage PWM ripple dutycycle that then increases output on the low side.Can make the constant floating voltage of electric welding machine output through the adjustment dutycycle.The utility model has changed power device and has opened the dutycycle of shutoff, obtains stable unloaded output voltage values, guarantees the good uniformity of electric welder no-load voltage.
Floating voltage sampling circuit 1, floating voltage backfeed loop 2 and floating voltage control loop 3 in the utility model circuit can be above-mentioned analog circuits.In the control loop that uses band MCU or DSP, can also replace, and also comprise the control program of PWM control loop output in the software program with software program.
As conclusion, should notice that those skilled in the art will be apparent to make many variations and modification to preferred embodiment, and not break away from the principle of the utility model in fact describing in detail.This variation and modification are included within the scope of the described the utility model of appended claims.
Claims (5)
1. dc welding machine floating voltage amplitude limit mu balanced circuit is characterized in that, comprising:
The floating voltage sampling circuit, the floating voltage output valve of real-time sampling electric welding machine output through capacitance-resistance filter, step-down, again through linear light-coupled isolation, forms it filtering sampling signal and passes to the floating voltage backfeed loop;
The floating voltage backfeed loop is connected with the floating voltage sampling circuit, the filtering sampling signal of its output is carried out amplitude handle, and obtains the floating voltage value of feedback, sends this value of feedback to the floating voltage control loop with negative feedback type;
The floating voltage control loop is connected with the floating voltage backfeed loop, according to the difference control PWM control loop of floating voltage set-point and floating voltage value of feedback.
2. according to the said dc welding machine floating voltage of claim 1 amplitude limit mu balanced circuit, it is characterized in that the floating voltage control loop comprises:
The voltage feedback signal (DYFK) of the 18 resistance (R18) termination floating voltage backfeed loop; 5 pin of another termination second integrated transporting discharging (IC1) of the 18 resistance (R18) and the 3rd electric capacity (C3) end; The 3rd electric capacity (C3) other end ground connection; 7 pin of 6 pin of second integrated transporting discharging (IC1) and second integrated transporting discharging (IC1) connect and compose follower; The output of second integrated transporting discharging (IC1) is that 7 pin of IC1 connect the 20 resistance (R20) end; Another termination the 21 resistance (R21) end of the 20 resistance (R20), the 25 resistance (R25) end and the 4th electric capacity (C4) end, the 25 resistance (R25) other end and the 4th electric capacity (C4) other end ground connection, 10 pin of another termination the 3rd integrated transporting discharging (IC1) of the 21 resistance (R21);
The 22 resistance (R22) termination floating voltage set-point; 9 pin of another termination the 23 resistance (R23) end of the 22 resistance (R22), the 5th electric capacity (C5) end and the 3rd integrated transporting discharging (IC1); 8 pin of the 23 resistance (R23) other end, another termination the 3rd integrated transporting discharging (IC1) of the 5th electric capacity (C5) and the 24 resistance (R24) end; Another termination the 6th electric capacity (C6) end of the 24 resistance (R24) and first diode (D1) anode; The 6th electric capacity (C6) other end ground connection, first diode (D1) negative electrode connects the PWM control loop.
3. according to the said dc welding machine floating voltage of claim 2 amplitude limit mu balanced circuit; It is characterized in that; The floating voltage set-point is provided with through the 19 resistance (R19) and second potentiometer (VR2); 1 pin of the 19 resistance (R19) one termination+5V, another termination second potentiometer (VR2) of the 19 resistance (R19), 3 pin ground connection of second potentiometer (VR2), 2 pin of second potentiometer (VR2) connect the 19 resistance (R22) end.
4. according to the said dc welding machine floating voltage of claim 3 amplitude limit mu balanced circuit, it is characterized in that the floating voltage sampling circuit comprises:
One end of the positive pole of electric welding machine output and the 30 resistance (R30), an end of the tenth electric capacity (C10) are connected, first resistance (R1) end connects; The negative pole of output is connected with the 11 electric capacity (C11) end, the 30 resistance (R30) other end, the tenth electric capacity (C10) other end; The 11 electric capacity (C11) other end is connected with casing; First resistance (R1) other end is connected with an end of second resistance (R2), an end and first electric capacity (C1) end of the 3rd resistance (R3); First electric capacity (C1) other end, the 3rd resistance (R3) other end ground connection; Second resistance (R2) other end is connected with 3 pin and first triode (the Q1) _ B of linear optical coupling (PC1), first triode (Q1) _ C ground connection, and first triode (Q1) _ E connects an end of second triode (Q2) _ B and the 4th resistance (R4); The 4th resistance (R4) other end is connected with 2 pin of+15V and linear optical coupling (PC1); Second triode (Q2) _ C is connected with 1 pin of linear optical coupling (PC1), and second triode (Q2) _ E is connected with the 5th resistance (R5) end, 4 pin ground connection of the 5th resistance (R5) other end, linear optical coupling (PC1).
5. according to the said dc welding machine floating voltage of claim 4 amplitude limit mu balanced circuit, it is characterized in that the floating voltage backfeed loop comprises:
5 pin ground connection of linear optical coupling (PC1), 6 pin of linear optical coupling (PC1) are connected with an end and the 3rd triode (the Q3) _ B of the 6th resistance (R6); The 3rd triode (Q3) _ C ground connection; The 3rd triode (Q3) _ E connects an end of the 4th triode (Q4) _ B and the 7th resistance (R7), and another termination+15V of the 7th resistance (R7), the 4th triode (Q4) _ E connect the 9th resistance (R9) end; The 9th resistance (R9) other end ground connection; The 4th triode (Q4) _ C connects the 6th resistance (R6) other end, the 8th resistance (R8) end, the tenth resistance (R10) end and second electric capacity (C2) end, another termination+15V of the 8th resistance (R8), second electric capacity (C2) other end ground connection; Another termination the 11 resistance (R11) end of the tenth resistance (R10), and the 14 resistance (R14) end; 3 pin of another termination first potentiometer (VR1) of the 11 resistance (R11), 1 pin ground connection of first potentiometer (VR1), 3 pin of another termination the 15 resistance (R15) end of the 14 resistance (R14) and first integrated transporting discharging (IC1); The 15 resistance (R15) other end ground connection; The 12 resistance (R12) termination+15, another termination the 13 resistance (R13) end, the 17 resistance (R17) end, the 17 resistance (R17) other end ground connection, 2 pin of another termination the 16 resistance (R16) end of the 13 resistance (R13) and first integrated transporting discharging (IC1); 1 pin of another termination first integrated transporting discharging (IC1) of the 16 resistance (R16), this current potential are through the adjusted voltage feedback signal of amplitude (DYFK).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120278716XU CN202240075U (en) | 2011-08-03 | 2011-08-03 | No-load voltage amplitude-limiting pressure-stabilizing circuit of DC (Direct Current) electric welding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120278716XU CN202240075U (en) | 2011-08-03 | 2011-08-03 | No-load voltage amplitude-limiting pressure-stabilizing circuit of DC (Direct Current) electric welding machine |
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| Publication Number | Publication Date |
|---|---|
| CN202240075U true CN202240075U (en) | 2012-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120278716XU Expired - Lifetime CN202240075U (en) | 2011-08-03 | 2011-08-03 | No-load voltage amplitude-limiting pressure-stabilizing circuit of DC (Direct Current) electric welding machine |
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| Country | Link |
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| CN (1) | CN202240075U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105171187A (en) * | 2015-09-08 | 2015-12-23 | 刘文斌 | Electric welding machine with adjustable no-load voltage |
-
2011
- 2011-08-03 CN CN201120278716XU patent/CN202240075U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105171187A (en) * | 2015-09-08 | 2015-12-23 | 刘文斌 | Electric welding machine with adjustable no-load voltage |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120530 |