CN203679496U - Dual-voltage automatic switching circuit - Google Patents
Dual-voltage automatic switching circuit Download PDFInfo
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- CN203679496U CN203679496U CN201420088861.5U CN201420088861U CN203679496U CN 203679496 U CN203679496 U CN 203679496U CN 201420088861 U CN201420088861 U CN 201420088861U CN 203679496 U CN203679496 U CN 203679496U
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Abstract
The utility model discloses a dual-voltage automatic switching circuit. The dual-voltage automatic switching circuit comprises an input power supply, a control power supply circuit and a switching circuit body, wherein the input power supply is used for providing alternating current for the circuit, the control power supply circuit is connected with the input power supply and a main input voltage decision circuit, the main input voltage decision circuit is connected with an auxiliary input voltage decision circuit, and the switching circuit body is connected with the main input voltage decision circuit, the auxiliary input voltage decision circuit, the input power supply and a main power supply output circuit. According to the dual-voltage automatic switching circuit, the auxiliary input voltage decision circuit is additionally arranged based on the main input voltage decision circuit, the voltage is firstly judged by inputting a voltage sampling signal which is not processed by a three-terminal regulator to the main input voltage decision circuit when automatic judgment is conducted on a single-phase AC220V power supply and a single-phase AC380V power supply, and the working state of the main circuit is determined. A self-locking range is judged by the auxiliary input voltage decision circuit to enable the state of a main circuit inside a welding machine to be guaranteed, and the welding machine can operate stably.
Description
Technical field
The utility model relates to a kind of voltage conversion circuit, is in particular a kind of two automatic voltage switching circuit.
Background technology
Electric welding machine (electric welding machine) is exactly in fact the transformer with decline external characteristics, 220V and 380V alternating current is become to the direct current of low pressure, and electric welding machine generally can be divided into two kinds by out-put supply kind, and a kind of is AC power; One is galvanic.The electric welding machine of direct current can say it is also a powerful rectifier, divide both positive and negative polarity, when alternating current input, after transformer transformation, then by rectifier rectification, then output has the power supply of decline external characteristics, output can produce huge voltage change in the time switching on and off, the two poles of the earth electric arc that ignites in the time of instantaneous short circuit, utilizes the electric arc producing to come consumable electrode and wlding, the cooling object that makes their combinations that reached afterwards.Welding transformer has the feature of self, external characteristics is exactly the characteristic that voltage sharply declines after welding rod ignites, electric welding machine uses electric energy, electric energy moment is converted to heat energy, electricity is very general, electric welding machine is adapted at working under dry environment, do not need too many requirement, because of volume small and exquisite, simple to operate, easy to use, speed, the advantages such as the rear weld seam of welding is solid are wide weary of every field, special practical to the very high product of desired strength especially, can moment metal material of the same race (also can be connected dissimilar metal, just welding method difference) permanent connection, weld seam after heat treatment, with mother metal equality strength, seal fine, this has solved the problem of sealing and intensity to the manufacture of stored-gas and liquid container.
Electric welding machine adopts AV220V, AC380V automatically to change now, solve the problem that burns out critical component because of wrong voltage, automatic switching circuit in existing electric welding machine is carrying out the two voltage of electric welding machine AV220V, AC380V while automatically changing, because the fluctuation of external power source, judging after input power, if supply voltage is in the time of the fluctuation of judging point left and right, relay also can be changed back and forth and make change-over circuit drive main power source control output conversion back and forth, easily damage major loop device, cause welder fault.
Utility model content
For this reason, the utility model solves automatic switching circuit in prior art and causes relay to change back and forth because external power source fluctuates, easily damage the problem of major loop device, thereby propose a kind of two automatic voltage switching circuits that increase input voltage auxiliary judgement circuit solution external power source fluctuation problem.
For solving the problems of the technologies described above, the utility model by the following technical solutions:
A kind of two automatic voltage switching circuit, comprises input power, exchanges input for circuit provides;
Preferably, also comprise control power circuit, be connected with described input power and the main decision circuit of input voltage, the main decision circuit of described input voltage is connected with input voltage auxiliary judgement circuit;
Also comprise change-over circuit, it is connected with the main decision circuit of described input voltage, described input voltage auxiliary judgement circuit, described input power and main power source output circuit respectively.
Preferably, described control power circuit comprises bridge rectifier, and the output of described bridge rectifier is connected with three terminal regulator.
Preferably, the main decision circuit of described input voltage comprises comparison circuit, light receiving element and relay, and the switch of described relay is connected with described change-over circuit.
Preferably, described input voltage auxiliary judgement circuit comprises auxiliary comparison circuit and luminescent device, and described luminescent device and described light receiving element coordinate for photoelectrical coupler.
Preferably, the main decision circuit of described input voltage comprises operational amplifier IC2A, the output voltage V of the in-phase input end of described operational amplifier IC2A by resistance R 12 and described three terminal regulator+be connected, the in-phase input end of described operational amplifier IC2A is one end of contact resistance R13 also, the other end ground connection of described resistance R 13, the inverting input of described operational amplifier IC2A is directly connected with the output of bridge rectifier by resistance R 14, the inverting input of described operational amplifier IC2A is also connected with its negative power end by resistance R 15, the negative power end ground connection of described operational amplifier IC2A, its positive voltage terminal connect the output voltage V of described three terminal regulator+, the output of described operational amplifier IC2A is connected to the anode of diode D21 by resistance R 17, the negative electrode of described diode D21 is connected to the base stage of triode Q2 by resistance R 18, the output of described operational amplifier IC2A also with the anodic bonding of diode D2, the negative electrode of described diode D2 is connected with the in-phase input end of described operational amplifier IC2A by resistance R 16, the negative power end of described operational amplifier IC2A is also connected with the emitter stage of phototriode N1D, the colelctor electrode of described phototriode N1D is connected between described resistance R 17 and the anode of diode D21, the emitter stage of described triode Q2 is connected with the negative power end of operational amplifier IC2A, the colelctor electrode of described triode Q2 is connected with the base stage of triode Q3 by resistance R 19, the colelctor electrode of described triode Q3 is connected with the colelctor electrode of phototriode N1B, the emitter stage of described phototriode N1B is connected between the negative electrode and resistance R 18 of diode D21, the colelctor electrode of described triode Q3 is also connected to the grid of FET Q4 by resistance R 20, the source ground of described FET Q4, the drain electrode of described FET Q4 is connected with coil one end of relay K 1, the emitter stage of described triode Q3 and the coil other end of relay K 1 be connected and connect the output voltage V of described three terminal regulator+, the switch of described relay K 1 is connected with described change-over circuit.
Preferably, described input voltage auxiliary judgement circuit comprises operational amplifier IC1A, operational amplifier IC1B, the first bleeder circuit and the second bleeder circuit, described the first bleeder circuit comprises the resistance R 6 of series connection successively, R4, R5, the output voltage V of described resistance R 6 and described three terminal regulator+be connected, described resistance R 5 ground connection, the in-phase input end of described operational amplifier IC1A is connected between resistance R 6 and resistance R 4, the inverting input of described operational amplifier IC1B is connected between resistance R 4 and resistance R 5, described the second bleeder circuit comprises resistance R 2, one end of described resistance R 2 is connected with the output of described bridge rectifier, the other end of described resistance R 2 is by resistance R 3 ground connection, the in-phase input end of the inverting input of described operational amplifier IC1A and described operational amplifier IC1B is connected respectively between resistance R 2 and resistance R 3, the output voltage V of described three terminal regulator+be also connected between resistance R 2 and resistance R 3 by resistance R 1, the in-phase input end of described operational amplifier IC1A is also connected to its output by resistance R 7, the output of described operational amplifier IC1A is also connected with the negative electrode of diode D1, the negative electrode of the output connecting luminous diode LED1 of described operational amplifier IC1B, the anode of described LED 1 is connected with the negative electrode of described diode D1, the anode of described diode D1 is connected to the negative electrode of voltage-stabiliser tube Z1 by resistance R 9, resistance R 10 is in parallel with described diode D1 and resistance R 9, the negative electrode of described voltage-stabiliser tube Z1 also connects the positive pole of electrochemical capacitor C1, the minus earth of described electrochemical capacitor C1, the anode of described voltage-stabiliser tube Z1 is connected to the base stage of triode Q1 by resistance R 11, the emitter stage of described triode Q1 is connected with the negative pole of described electrochemical capacitor C1, the colelctor electrode of described triode Q1 is connected with the negative electrode of light emitting diode N1C, the anode of described light emitting diode N1C is connected with the negative electrode of light emitting diode N1A, the anode of described light emitting diode N1A is connected to the negative electrode of diode D1 by resistance R 22 and the resistance R 8 of series connection, the output voltage V of described three terminal regulator+be connected between resistance R 22 and resistance R 8.
Technique scheme of the present utility model has the following advantages compared to existing technology,
(1) described in the utility model pair of automatic voltage switching circuit, comprises input power, exchanges input for circuit provides; Also comprise control power circuit, be connected with described input power and the main decision circuit of input voltage, the main decision circuit of described input voltage is connected with input voltage auxiliary judgement circuit; Also comprise change-over circuit, it is connected with the main decision circuit of described input voltage, input voltage auxiliary judgement circuit, input power and main power source output circuit respectively, the utility model is also provided with input voltage auxiliary judgement circuit on the basis that is provided with the main decision circuit of input voltage, make this circuit in the time of single-phase AC220V power supply and single-phase AC380V power supply automatic decision, by the voltage sampling signal that does not pass through three terminal regulator, the main decision circuit of input voltage first judges the height of voltage, determines the duty of main circuit.Input voltage auxiliary judgement circuit judges that the scope of a self-locking ensures the state in welding machine internal main loop again, makes welding machine energy steady operation.
Brief description of the drawings
For content of the present utility model is more likely to be clearly understood, according to specific embodiment of the utility model also by reference to the accompanying drawings, the utility model is described in further detail, wherein below
Fig. 1 is the structural representation of described in the utility model pair of automatic voltage switching circuit;
Fig. 2 is the circuit diagram of control power circuit described in the utility model;
Fig. 3 is the circuit diagram of the main decision circuit of input voltage described in the utility model;
Fig. 4 is the circuit diagram of input voltage auxiliary judgement circuit described in the utility model;
Fig. 5 is the circuit diagram of change-over circuit described in the utility model.
Detailed description of the invention
The detailed description of the invention of described in the utility model pair of automatic voltage switching circuit is provided below.
Described in the utility model pair of automatic voltage switching circuit, for welding machine builtin voltage automatic switch-over circuit, as shown in Figure 1, comprises input power, exchanges input for circuit provides, and in the present embodiment, it is that 220V exchanges input that described input power adopts normal civil power; Also comprise control power circuit, be connected with described input power and the main decision circuit of input voltage, the main decision circuit of described input voltage is connected with input voltage auxiliary judgement circuit; Described control power circuit comprises bridge rectifier, as shown in Figure 2, described bridge rectifier is direct current output by the interchange input rectifying of described input power, offering the main decision circuit of input voltage uses, the output of described bridge rectifier is connected with three terminal regulator, and the direct current of described bridge rectifier output is carried out to lowering and stabilizing blood pressure.
The utility model is also provided with change-over circuit, described change-over circuit can be converted to 380V alternating current by the 220V alternating current of described input voltage input, its respectively with the main decision circuit of described input voltage, input voltage auxiliary judgement circuit, input power is connected with main power source output circuit, the main decision circuit of described input voltage comprises comparison circuit, light receiving element and relay, the switch of described relay is connected with described change-over circuit, the voltage of the process three terminal regulator that described comparison circuit is exported described process bridge-type finishing circuit rectification and the not voltage of process three terminal regulator compare, by change-over circuit described in described Control, make the output current of described change-over circuit exchange conversion between 380V interchange at 220V, the electric current of described change-over circuit output is finally by crossing described main power source output circuit output, described input voltage auxiliary judgement circuit comprises auxiliary comparison circuit and luminescent device, described luminescent device and described light receiving element coordinate for photoelectrical coupler, described photoelectrical coupler is two photoelectrical couplers, in the present embodiment, described luminescent device is photoelectrical coupler input, described light receiving element is photoelectric coupler output end, the voltage of the described auxiliary comparison circuit process three terminal regulator that further described bridge-type finishing circuit rectification is exported to process and the not voltage of process three terminal regulator compare, then by light receiving element described in luminescent device control, judge the scope of a self-locking, make welding machine energy steady operation.
On the basis of the two automatic voltage switching circuits described in embodiment 1, as shown in Figure 3, the main decision circuit of described input voltage comprises operational amplifier IC2A, the output voltage V of the in-phase input end of described operational amplifier IC2A by resistance R 12 and described three terminal regulator+be connected, the in-phase input end of described operational amplifier IC2A is one end of contact resistance R13 also, the other end ground connection of described resistance R 13, the inverting input of described operational amplifier IC2A is directly connected with the output of bridge rectifier by resistance R 14, the inverting input of described operational amplifier IC2A is also connected with its negative power end by resistance R 15, the negative power end ground connection of described operational amplifier IC2A, its positive voltage terminal connect the output voltage V of described three terminal regulator+, the output of described operational amplifier IC2A is connected to the anode of diode D21 by resistance R 17, the negative electrode of described diode D21 is connected to the base stage of triode Q2 by resistance R 18, the output of described operational amplifier IC2A also with the anodic bonding of diode D2, the negative electrode of described diode D2 is connected with the in-phase input end of described operational amplifier IC2A by resistance R 16, described light receiving element and described luminescent device are combined as two photoelectrical coupler N1, described couple of photoelectrical coupler N1 adopts optocoupler PC521-2 in the present embodiment, described light receiving element adopts phototriode in the present embodiment, it is two photoelectrical coupler N1 outputs, the negative power end of described operational amplifier IC2A is connected with the emitter stage of phototriode N1D, the colelctor electrode of described phototriode N1D is connected between described resistance R 17 and the anode of diode D21, the emitter stage of described triode Q2 is connected with the negative power end of operational amplifier IC2A, the colelctor electrode of described triode Q2 is connected with the base stage of triode Q3 by resistance R 19, another output of the two photoelectrical coupler N1 of the colelctor electrode of described triode Q3 and phototriode N1B() colelctor electrode be connected, the emitter stage of described phototriode N1B is connected between the negative electrode and resistance R 18 of diode D21, the colelctor electrode of described triode Q3 is also connected to the grid of FET Q4 by resistance R 20, the source ground of described FET Q4, the drain electrode of described FET Q4 is connected with coil one end of relay K 1, the emitter stage of described triode Q3 and the coil other end of relay K 1 be connected and connect the output voltage V of described three terminal regulator+, the switch of described relay K 1 is connected with described change-over circuit.
Described change-over circuit, as shown in Figure 5, comprises the output rectification circuit being made up of diode D8, D9, D10, D11, and the switch of relay K 1, capacitor C 22, CX1, CX2, CX3, CX33, CX4 and resistance R X1, RX2.
The main decision circuit operation principle of input voltage is: the A point voltage sampled signal of process three terminal regulator is not through R14, the 3rd bleeder circuit of R15 composition provides the numerical value with input voltage state variation, inner through three terminal regulator and through resistance R 12 with welding machine, the numerical value of the fixed voltage state that the 4th bleeder circuit of R13 composition provides compares, when resistance R 14, the numerical value of the 3rd bleeder circuit of R15 composition is higher than resistance R 12, when the numerical value of the fixed voltage state that the 4th bleeder circuit of R13 composition provides, described operational amplifier IC2A output HIGH voltage, by base anger R17, R18, R19, R20, triode Q2, Q3, FET Q4 drives relay K 1 switch, contact B, C connects, making change-over circuit pass through described main power source output circuit output 380V exchanges, otherwise relay K 1 switch is not worked, contact B, C disconnect, and make change-over circuit pass through described main power source output circuit output 220V and exchange.
Described input voltage auxiliary judgement circuit comprises operational amplifier IC1A, operational amplifier IC1B, the first bleeder circuit and the second bleeder circuit, as shown in Figure 4, described the first bleeder circuit comprises the resistance R 6 of series connection successively, R4, R5, the output voltage V of described resistance R 6 and described three terminal regulator+be connected, described resistance R 5 ground connection, the in-phase input end of described operational amplifier IC1A is connected between resistance R 6 and resistance R 4, the inverting input of described operational amplifier IC1B is connected between resistance R 4 and resistance R 5, described the second bleeder circuit comprises resistance R 2, one end of described resistance R 2 is connected with the output of described bridge rectifier, the other end of described resistance R 2 is by resistance R 3 ground connection, the in-phase input end of the inverting input of described operational amplifier IC1A and described operational amplifier IC1B is connected respectively between resistance R 2 and resistance R 3, the output voltage V of described three terminal regulator+be also connected between resistance R 2 and resistance R 3 by resistance R 1, the in-phase input end of described operational amplifier IC1A is also connected to its output by resistance R 7, the output of described operational amplifier IC1A is also connected with the negative electrode of diode D1, the negative electrode of the output connecting luminous diode LED1 of described operational amplifier IC1B, the anode of described LED 1 is connected with the negative electrode of described diode D1, the anode of described diode D1 is connected to the negative electrode of voltage-stabiliser tube Z1 by resistance R 9, resistance R 10 is in parallel with described diode D1 and resistance R 9, the negative electrode of described voltage-stabiliser tube Z1 also connects the positive pole of electrochemical capacitor C1, the minus earth of described electrochemical capacitor C1, the anode of described voltage-stabiliser tube Z1 is connected to the base stage of triode Q1 by resistance R 11, the emitter stage of described triode Q1 is connected with the negative pole of described electrochemical capacitor C1, described luminescent device is the input of two photoelectrical coupler N1, adopt in the present embodiment light emitting diode, the colelctor electrode of described triode Q1 is connected with the negative electrode of light emitting diode N1C, the anode of described light emitting diode N1C is connected with the negative electrode of light emitting diode N1A, the anode of described light emitting diode N1A is connected to the negative electrode of diode D1 by resistance R 22 and the resistance R 8 of series connection, the output voltage V of described three terminal regulator+be connected between resistance R 22 and resistance R 8.
Described input voltage auxiliary judgement circuit working principle is: the A point voltage sampled signal of process three terminal regulator is not through resistance R 2, the numerical value of the input voltage state that the second bleeder circuit of R3 composition provides, inner through three terminal regulator R6 with welding machine, R5, the numerical value of the fixed voltage state that the first bleeder circuit of R4 composition provides compares, when resistance R 2, the voltage value that R3 provides is higher than resistance R 6, when the numerical value of the fixed voltage state that resistance R 4+ resistance R 5 provides, operational amplifier IC1A output LOW voltage, resistance R 2 simultaneously, the numerical value of the fixed voltage state that R3 provides is also higher than resistance R 6+ resistance R 4, the voltage value that resistance R 5 provides, operational amplifier IC1B output HIGH voltage, the numerical value of the fixed voltage state that the voltage value providing as resistance R 2, R3 provides lower than resistance R 6, resistance R 4+ resistance R 5 and provide higher than resistance R 6+ resistance R 4, resistance R 5 voltage value time, operational amplifier IC1A output HIGH voltage, operational amplifier IC1B output HIGH voltage, when voltage value that the voltage value providing as resistance R 2, R3 provides lower than resistance R 6+R4, resistance R 5, operational amplifier IC1A output HIGH voltage, operational amplifier IC1B output LOW voltage.Under this three state, only have when operational amplifier IC1A, IC1B are when output HIGH voltage, just can make the high potential of operational amplifier IC1A output puncture voltage-stabiliser tube Z1 by resistance R 10, make two photoelectrical coupler N1 conducting of light emitting diode N1-A and phototriode N1-B composition by resistance R 11, triode Q1.Under this state, light emitting diode N1-C and phototriode N1-D are from the output state that pins relay K 1, and this voltage section is the original acknowledgement state of relay K 1; Self-locking realizes by following: in the time that the main decision circuit judgement of input voltage makes described change-over circuit be output as AC380V, if when voltage fluctuates within the scope of self-locking, two photoelectrical coupler N1 conducting work, phototriode N1-B is from pinning standing state, and phototriode N1-D blocks the main decision circuit of input voltage; In the time that the main decision circuit judgement of input voltage makes described change-over circuit output AC220V, if when voltage fluctuates within the scope of self-locking, two photoelectrical coupler N1 conducting work, phototriode N1-D is from pinning standing state, due to the very electronegative potential of current collection of triode Q3, phototriode N1-B is inoperative.So just can reliable self-locking.Other 2 kinds of state releases, under released state, not conducting of two photoelectrical coupler N1, phototriode N1-B, not conducting of N1-D, all latching circuits are not worked, relay K 1 condition controlled in the state of operational amplifier IC2A output voltage.
Therefore the utility model is carrying out the two voltage of welding machine AV220V, AC380V while automatically changing, increase a self-locking scope for voltage among a small circle, judge after input power at the main decision circuit of input voltage, if within the scope of the voltage self-locking that supply voltage is set at input voltage auxiliary judgement circuit in the scope of judging point left and right fluctuation time, understand the state of lock up relay K1 and make change-over circuit drive main power source output circuit stable, can not change back and forth, improve welding machine quality.Once and voltage range leave this voltage section will release, guarantee reliability service.
Obviously, above-described embodiment is only for example is clearly described, and the not restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here without also giving exhaustive to all embodiments.And among the protection domain that the apparent variation of being extended out thus or variation are still created in the utility model.
Claims (6)
1. two automatic voltage switching circuits, comprise input power, exchange input for circuit provides;
It is characterized in that, also comprise control power circuit, be connected with described input power and the main decision circuit of input voltage, the main decision circuit of described input voltage is connected with input voltage auxiliary judgement circuit;
Also comprise change-over circuit, it is connected with the main decision circuit of described input voltage, described input voltage auxiliary judgement circuit, described input power and main power source output circuit respectively.
2. according to claim 1 pair of automatic voltage switching circuit, is characterized in that, described control power circuit comprises bridge rectifier, and the output of described bridge rectifier is connected with three terminal regulator.
3. according to claim 2 pair of automatic voltage switching circuit, is characterized in that, the main decision circuit of described input voltage comprises comparison circuit, light receiving element and relay, and the switch of described relay is connected with described change-over circuit.
4. according to claim 3 pair of automatic voltage switching circuit, is characterized in that, described input voltage auxiliary judgement circuit comprises auxiliary comparison circuit and luminescent device, and described luminescent device and described light receiving element coordinate for photoelectrical coupler.
5. according to claim 2 pair of automatic voltage switching circuit, it is characterized in that, the main decision circuit of described input voltage comprises operational amplifier IC2A, the output voltage V of the in-phase input end of described operational amplifier IC2A by resistance R 12 and described three terminal regulator+be connected, the in-phase input end of described operational amplifier IC2A is one end of contact resistance R13 also, the other end ground connection of described resistance R 13, the inverting input of described operational amplifier IC2A is directly connected with the output of bridge rectifier by resistance R 14, the inverting input of described operational amplifier IC2A is also connected with its negative power end by resistance R 15, the negative power end ground connection of described operational amplifier IC2A, its positive voltage terminal connect the output voltage V of described three terminal regulator+, the output of described operational amplifier IC2A is connected to the anode of diode D21 by resistance R 17, the negative electrode of described diode D21 is connected to the base stage of triode Q2 by resistance R 18, the output of described operational amplifier IC2A also with the anodic bonding of diode D2, the negative electrode of described diode D2 is connected with the in-phase input end of described operational amplifier IC2A by resistance R 16, the negative power end of described operational amplifier IC2A is also connected with the emitter stage of phototriode N1D, the colelctor electrode of described phototriode N1D is connected between described resistance R 17 and the anode of diode D21, the emitter stage of described triode Q2 is connected with the negative power end of operational amplifier IC2A, the colelctor electrode of described triode Q2 is connected with the base stage of triode Q3 by resistance R 19, the colelctor electrode of described triode Q3 is connected with the colelctor electrode of phototriode N1B, the emitter stage of described phototriode N1B is connected between the negative electrode and resistance R 18 of diode D21, the colelctor electrode of described triode Q3 is also connected to the grid of FET Q4 by resistance R 20, the source ground of described FET Q4, the drain electrode of described FET Q4 is connected with coil one end of relay K 1, the emitter stage of described triode Q3 and the coil other end of relay K 1 be connected and connect the output voltage V of described three terminal regulator+, the switch of described relay K 1 is connected with described change-over circuit.
6. according to claim 5 pair of automatic voltage switching circuit, it is characterized in that, described input voltage auxiliary judgement circuit comprises operational amplifier IC1A, operational amplifier IC1B, the first bleeder circuit and the second bleeder circuit, described the first bleeder circuit comprises the resistance R 6 of series connection successively, R4, R5, the output voltage V of described resistance R 6 and described three terminal regulator+be connected, described resistance R 5 ground connection, the in-phase input end of described operational amplifier IC1A is connected between resistance R 6 and resistance R 4, the inverting input of described operational amplifier IC1B is connected between resistance R 4 and resistance R 5, described the second bleeder circuit comprises resistance R 2, one end of described resistance R 2 is connected with the output of described bridge rectifier, the other end of described resistance R 2 is by resistance R 3 ground connection, the in-phase input end of the inverting input of described operational amplifier IC1A and described operational amplifier IC1B is connected respectively between resistance R 2 and resistance R 3, the output voltage V of described three terminal regulator+be also connected between resistance R 2 and resistance R 3 by resistance R 1, the in-phase input end of described operational amplifier IC1A is also connected to its output by resistance R 7, the output of described operational amplifier IC1A is also connected with the negative electrode of diode D1, the negative electrode of the output connecting luminous diode LED1 of described operational amplifier IC1B, the anode of described LED 1 is connected with the negative electrode of described diode D1, the anode of described diode D1 is connected to the negative electrode of voltage-stabiliser tube Z1 by resistance R 9, resistance R 10 is in parallel with described diode D1 and resistance R 9, the negative electrode of described voltage-stabiliser tube Z1 also connects the positive pole of electrochemical capacitor C1, the minus earth of described electrochemical capacitor C1, the anode of described voltage-stabiliser tube Z1 is connected to the base stage of triode Q1 by resistance R 11, the emitter stage of described triode Q1 is connected with the negative pole of described electrochemical capacitor C1, the colelctor electrode of described triode Q1 is connected with the negative electrode of light emitting diode N1C, the anode of described light emitting diode N1C is connected with the negative electrode of light emitting diode N1A, the anode of described light emitting diode N1A is connected to the negative electrode of diode D1 by resistance R 22 and the resistance R 8 of series connection, the output voltage V of described three terminal regulator+be connected between resistance R 22 and resistance R 8.
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| CN201420088861.5U CN203679496U (en) | 2014-02-28 | 2014-02-28 | Dual-voltage automatic switching circuit |
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| CN201420088861.5U CN203679496U (en) | 2014-02-28 | 2014-02-28 | Dual-voltage automatic switching circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104601018A (en) * | 2015-01-16 | 2015-05-06 | 晋中职业技术学院 | Double power supply with protecting circuit for multifunctional argon arc welding machine |
| CN104625333A (en) * | 2014-12-12 | 2015-05-20 | 杭州凯尔达电焊机有限公司 | Novel DC/AC arc welding device |
| CN105880819A (en) * | 2016-03-26 | 2016-08-24 | 广州微点焊设备有限公司 | Microscopic-welding point welding machine for hot-pressing electric resistance welding |
-
2014
- 2014-02-28 CN CN201420088861.5U patent/CN203679496U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104625333A (en) * | 2014-12-12 | 2015-05-20 | 杭州凯尔达电焊机有限公司 | Novel DC/AC arc welding device |
| CN104625333B (en) * | 2014-12-12 | 2016-06-01 | 杭州凯尔达电焊机有限公司 | A kind of novel DC/AC arc welding equipment |
| CN104601018A (en) * | 2015-01-16 | 2015-05-06 | 晋中职业技术学院 | Double power supply with protecting circuit for multifunctional argon arc welding machine |
| CN104601018B (en) * | 2015-01-16 | 2017-03-08 | 晋中职业技术学院 | A kind of Multifunctional argon arc welding machine dual power supply with protection circuit |
| CN105880819A (en) * | 2016-03-26 | 2016-08-24 | 广州微点焊设备有限公司 | Microscopic-welding point welding machine for hot-pressing electric resistance welding |
| CN105880819B (en) * | 2016-03-26 | 2019-03-26 | 广州微点焊设备有限公司 | Hot pressing electric resistance welding micro welding contact welding machine |
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