CN215498400U - Double-power-supply type arc welding power supply input voltage detection device - Google Patents
Double-power-supply type arc welding power supply input voltage detection device Download PDFInfo
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- CN215498400U CN215498400U CN202121352678.8U CN202121352678U CN215498400U CN 215498400 U CN215498400 U CN 215498400U CN 202121352678 U CN202121352678 U CN 202121352678U CN 215498400 U CN215498400 U CN 215498400U
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Abstract
The utility model discloses a double-power-supply type arc welding power supply input voltage detection device, which relates to the technical field of arc welding and has the technical scheme that: the device comprises an input voltage judging circuit, an isolating module, a voltage type latch circuit, a voltage doubling execution circuit, a power-on delay protection circuit and a PWM control circuit which are sequentially connected; an electronic switch N4B is arranged in the voltage type latch circuit; the output end 1 of the power-on delay protection circuit is simultaneously connected with the input end P16 of the PWM control circuit and the electronic switch N4B, and the reference voltage end P2 of the PWM control circuit is connected with the reference voltage end of the power-on delay protection circuit. The double-power-supply arc welding power supply can be automatically switched according to the type of the power grid voltage, the power grid voltage of 380V and 220V can be ensured to work safely and reliably, and the voltage detection device cannot generate misjudgment even if the power grid voltage fluctuates reasonably or the input voltage changes caused by the work of a welding machine.
Description
Technical Field
The utility model relates to the technical field of arc welding, in particular to a double-power-supply type arc welding power supply input voltage detection device.
Background
At present, a voltage detection device used with a dual-power arc welding power supply generally comprises an input voltage judgment circuit, an isolation module, a voltage type latch circuit and a voltage doubling execution circuit. When the device is used, the double-power-supply type arc welding power supply can be automatically switched according to the type of the power grid voltage, and the safe and reliable work of both 380V and 220V of the power grid voltage can be ensured.
However, the existing dual-power arc welding power supply and the PWM output circuit are not logically associated and independent from each other, and when the grid voltage itself fluctuates reasonably or the input voltage changes due to the operation of the welding machine, the voltage detection apparatus may have misjudgment, which results in that the existing voltage detection apparatus cannot meet the requirement of high-reliability switching of the dual-power arc welding power supply, and cannot ensure reliable operation of the dual-power arc welding power supply.
Therefore, how to design a dual-power arc welding power supply input voltage detection device capable of overcoming the defects is a problem which is urgently needed to be solved at present.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects in the prior art, the utility model aims to provide a double-power-supply type arc welding power supply input voltage detection device.
The technical purpose of the utility model is realized by the following technical scheme: the double-power-supply arc welding power supply input voltage detection device comprises an input voltage judgment circuit, an isolation module, a voltage type latch circuit, a voltage doubling execution circuit, a power-on delay protection circuit and a PWM control circuit which are sequentially connected;
an electronic switch N4B is arranged in the voltage type latch circuit;
the output end 1 of the power-on delay protection circuit is simultaneously connected with the input end P16 of the PWM control circuit and the electronic switch N4B, and the reference voltage end P2 of the PWM control circuit is connected with the reference voltage end of the power-on delay protection circuit;
when the power-on delay protection circuit outputs a first level signal, the electronic switch N4B responds to the first level signal and controls the voltage type latch circuit to be conducted with the isolation module after being started, and the PWM control circuit responds to the first level signal and is in a self-locking state;
when the power-on delay protection circuit outputs the second level signal, the electronic switch N4B controls the voltage type latch circuit to be disconnected from the isolation module after being turned off in response to the second level signal, and the PWM control circuit is in an output-enabled state in response to the second level signal.
Further, the power-on delay protection circuit comprises a comparator N1A, a resistor R1, a resistor R2, a resistor R4, a capacitor C1, a capacitor C3, a diode V1 and a diode V2;
after the resistor R4 and the capacitor C3 are connected in parallel, one end of the resistor R4 is connected with the input end 2 of the comparator N1A, and the other end of the resistor R4 is grounded;
after the diode V1 and the resistor R1 are connected in parallel, one end of the diode V1 is connected with the input end 2 of the comparator N1A, and the other end of the diode V8932 is connected with a power supply end and is grounded through a capacitor C1;
the input end 3 of the comparator N1A is connected with the reference voltage end P2 of the PWM control circuit;
the output terminal 1 of the comparator N1A is connected to the electronic switch N4B, and is connected to the input terminal P16 of the PWM control circuit through the resistor R2 and the diode V2 connected in series.
Further, the voltage type latch circuit further comprises a capacitor C6, a capacitor C7, a capacitor C8, a resistor R8, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a diode V5, and a state latch N4A;
after the capacitor C6 and the resistor R13 are connected in parallel, one end of the capacitor C6 is connected with the isolation module and is simultaneously connected with the joint 15 of the electronic switch N4B through the resistor R11, and the other end of the capacitor C6 is grounded;
the node between the junction 15 of the electronic switch N4B and the resistor R11 is connected with the power supply through a diode V5 and is grounded through a capacitor C7; the resistor R8 is connected with the contact 10 of the electronic switch N4B;
the contact 1 of the electronic switch N4B is grounded through a capacitor C8, and is connected with the contact 11 of the state latch N4A through a resistor R12, and is connected with the contact 14 of the state latch N4A through a resistor R15;
the joint 14 of the state latch N4A is connected with the resistor R16 and the resistor R14 after being connected in series, and a node between the resistor R16 and the resistor R14 is connected with the voltage-doubling execution circuit;
the contact 12 of the state latch N4A is grounded, and the contact 13 of the state latch N4A is connected to the power supply through the resistor R10.
Further, the input voltage judgment circuit comprises a resistor R3, a resistor R6, a resistor R7, a resistor R9, a capacitor C2, a capacitor C4, a diode V3, a voltage-stabilizing diode V4 and a comparator N2A;
after the resistor R6, the resistor R7 and the capacitor C4 are connected in parallel, one end of the resistor R6, the resistor R7 and the capacitor C4 are simultaneously connected with an input high-voltage end and the input end 2 of the comparator N2A, and the other end of the resistor R7 is grounded;
the input terminal 3 of the comparator N2A is connected with a power supply through a resistor R3 and is grounded through a capacitor C2, and the power supply terminal of the comparator N2A is connected through a diode V3;
the output end 1 of the comparator N2A is connected with the isolation module through a voltage stabilizing diode V4 and a resistor R9 which are connected in series.
Further, the voltage doubling execution circuit comprises a MOS field effect transistor, a resistor R5, a light emitting diode LED1, a capacitor C5, a relay KD1 and a voltage doubling circuit board;
the source electrode of the MOS field effect transistor is grounded and is connected with a power supply through a capacitor C5 and a relay KD1 which are connected in series; the collector of the MOS field effect transistor is connected with a power supply through a light emitting diode LED1 and a resistor R5 which are connected in series; the node between the relay KD1 and the capacitor C5 is connected with the drain electrode of the MOS field effect transistor;
the normally open contact switch of the relay KD1 is connected with the voltage-doubling circuit board in series to form a loop.
Furthermore, the PWM control circuit adopts a control chip with a model of UC 3846.
Compared with the prior art, the utility model has the following beneficial effects:
1. when the double-power-supply type arc welding power supply input voltage detection device is used by equipment, the double-power-supply type arc welding power supply can be automatically switched according to the type of the power grid voltage, the 380V and 220V power grid voltage can be ensured to work safely and reliably, and the voltage detection device cannot make misjudgment even if the power grid voltage fluctuates reasonably or the input voltage changes caused by the work of a welding machine;
2. the utility model forms an interlocking mechanism of the PWM output and the network voltage detection circuit, only one of the power supply switching and the PWM output can be generated at any time, and the conditions of the power supply switching and the PWM output can not be generated at the same time, namely, the safety of the voltage doubling execution circuit is ensured, and the safety of the MOS field effect transistor is ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the utility model and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the utility model and together with the description serve to explain the principles of the utility model. In the drawings:
fig. 1 is a schematic diagram of the operation in the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example (b): as shown in fig. 1, the input voltage detection device for the dual-power arc welding power supply comprises a power-on delay protection circuit, a PWM control circuit, and an input voltage judgment circuit, an isolation module, a voltage type latch circuit, and a voltage doubling execution circuit, which are connected in sequence. The voltage type latch circuit incorporates an electronic switch N4B. The output end 1 of the power-on delay protection circuit is simultaneously connected with the input end P16 of the PWM control circuit and the electronic switch N4B, and the reference voltage end P2 of the PWM control circuit is connected with the reference voltage end of the power-on delay protection circuit. When the power-on delay protection circuit outputs the first level signal, the electronic switch N4B controls the voltage type latch circuit to be conducted with the isolation module after being turned on in response to the first level signal, and the PWM control circuit is in a self-locking state in response to the first level signal. When the power-on delay protection circuit outputs the second level signal, the electronic switch N4B controls the voltage type latch circuit to be disconnected from the isolation module after being turned off in response to the second level signal, and the PWM control circuit is in an output-enabled state in response to the second level signal.
The power-on delay protection circuit comprises a comparator N1A, a resistor R1, a resistor R2, a resistor R4, a capacitor C1, a capacitor C3, a diode V1 and a diode V2. After the resistor R4 and the capacitor C3 are connected in parallel, one end of the resistor R4 is connected with the input end 2 of the comparator N1A, and the other end of the resistor R8932 is grounded. After the diode V1 and the resistor R1 are connected in parallel, one end of the diode is connected to the input end 2 of the comparator N1A, and the other end of the diode is connected to a power supply terminal and grounded through the capacitor C1. Input terminal 3 of comparator N1A is connected to reference voltage terminal P2 of the PWM control circuit. The output terminal 1 of the comparator N1A is connected to the electronic switch N4B, and is connected to the input terminal P16 of the PWM control circuit through the resistor R2 and the diode V2 connected in series.
The voltage type latch circuit further comprises a capacitor C6, a capacitor C7, a capacitor C8, a resistor R8, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a diode V5 and a state latch N4A. After the capacitor C6 and the resistor R13 are connected in parallel, one end of the capacitor C6 is connected with the isolation module and is simultaneously connected with the joint 15 of the electronic switch N4B through the resistor R11, and the other end of the capacitor C6 is grounded. The node between the junction 15 of the electronic switch N4B and the resistor R11 is connected with the power supply through a diode V5 and is grounded through a capacitor C7; and the resistor R8 is connected to the contact 10 of the electronic switch N4B. The contact 1 of the electronic switch N4B is connected to ground through the capacitor C8, to the contact 11 of the state latch N4A through the resistor R12, and to the contact 14 of the state latch N4A through the resistor R15. The contact 14 of the state latch N4A is connected through the resistor R16 and the resistor R14 which are connected in series, and the node between the resistor R16 and the resistor R14 is connected with the voltage-doubling execution circuit. The contact 12 of the state latch N4A is grounded, and the contact 13 of the state latch N4A is connected to the power supply through the resistor R10.
The voltage type latch circuit holds the state H or L of IN _ S IN the circuit for a predetermined time.
The input voltage judging circuit comprises a resistor R3, a resistor R6, a resistor R7, a resistor R9, a capacitor C2, a capacitor C4, a diode V3, a voltage stabilizing diode V4 and a comparator N2A. After the resistor R6, the resistor R7 and the capacitor C4 are connected in parallel, one end of the resistor R6, the resistor R7 and the capacitor C4 are simultaneously connected with the input high-voltage end and the input end 2 of the comparator N2A, and the other end of the resistor R7 is grounded. Input terminal 3 of comparator N2A is connected to the power supply through resistor R3 and to ground through capacitor C2, and to the power supply terminal of comparator N2A through diode V3. The output end 1 of the comparator N2A is connected with the isolation module through a voltage stabilizing diode V4 and a resistor R9 which are connected in series.
For example, the comparator N2A outputs IN _ S at a high level H indicating that a voltage doubling is required for 220V grid, and outputs IN _ S at a low level L indicating that a voltage doubling is not required for 380V grid.
The isolation module N3 is a safety voltage isolation module and is used for isolating the 'hot ground' of the power grid voltage from the 'cold ground' of the main control board, so that safety accidents such as electronic device burning and personal electric shock are avoided.
The voltage doubling execution circuit comprises a MOS field effect transistor, a resistor R5, a light emitting diode LED1, a capacitor C5, a relay KD1 and a voltage doubling circuit board. The source electrode of the MOS field effect transistor is grounded and is connected with a power supply through a capacitor C5 and a relay KD1 which are connected in series; the collector of the MOS field effect transistor is connected with a power supply through a light emitting diode LED1 and a resistor R5 which are connected in series; and a node between the relay KD1 and the capacitor C5 is connected with the drain of the MOS field effect transistor. The normally open contact switch of the relay KD1 is connected with the voltage-doubling circuit board in series to form a loop.
The voltage doubling execution circuit finally gives execution of the state H or L held by the voltage type latch circuit.
The PWM control circuit adopts a control chip with the model of UC 3846.
The working principle is as follows: when the voltage of the point A rises from 0V to 5V, the voltage of the point B is +15V, pins P1 and P15 of the electronic switch N4B are directly connected, and the state of the input voltage is stored by the state latch N4A in the process;
when the voltage of the point A rises from 0V to 5V, due to the action of a diode V2 and a resistor R2, the PWM output of the UC3846 is always locked, namely the PWM is not output all the time during the state identification of the input voltage and the power supply switching period, an interlocking mechanism of the PWM output and the network voltage detection circuit is formed, only one of the power supply switching and the PWM output can be generated at any time, the power supply switching and the PWM output can not be generated at the same time, and the safety of the MOS field effect transistor is ensured;
when the charging voltage at the point A is higher than 5.1V, the voltage at the point B is 0V, the pins P1 and P15 of the electronic switch N4B are disconnected, and then the state IN _ S of the input voltage is stored by the state latch N4A, so that the detection circuit cannot be interfered due to power grid fluctuation or welding machine operation;
the power supply type identification is completed in a longer time window instead of a certain time point, so that the accuracy of the power supply identification can completely meet the actual requirement, and the voltage doubling capacitor or the MOS field effect transistor is prevented from being damaged due to voltage doubling when the voltage is not doubled.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. The double-power-supply type arc welding power supply input voltage detection device comprises an input voltage judgment circuit, an isolation module, a voltage type latch circuit and a voltage doubling execution circuit which are sequentially connected, and is characterized by also comprising a power-on delay protection circuit and a PWM control circuit;
an electronic switch N4B is arranged in the voltage type latch circuit;
the output end 1 of the power-on delay protection circuit is simultaneously connected with the input end P16 of the PWM control circuit and the electronic switch N4B, and the reference voltage end P2 of the PWM control circuit is connected with the reference voltage end of the power-on delay protection circuit;
when the power-on delay protection circuit outputs a first level signal, the electronic switch N4B responds to the first level signal and controls the voltage type latch circuit to be conducted with the isolation module after being started, and the PWM control circuit responds to the first level signal and is in a self-locking state;
when the power-on delay protection circuit outputs the second level signal, the electronic switch N4B controls the voltage type latch circuit to be disconnected from the isolation module after being turned off in response to the second level signal, and the PWM control circuit is in an output-enabled state in response to the second level signal.
2. The input voltage detecting apparatus of the dual power arc welding power supply according to claim 1, wherein the power-on delay protection circuit includes a comparator N1A, a resistor R1, a resistor R2, a resistor R4, a capacitor C1, a capacitor C3, a diode V1, a diode V2;
after the resistor R4 and the capacitor C3 are connected in parallel, one end of the resistor R4 is connected with the input end 2 of the comparator N1A, and the other end of the resistor R4 is grounded;
after the diode V1 and the resistor R1 are connected in parallel, one end of the diode V1 is connected with the input end 2 of the comparator N1A, and the other end of the diode V8932 is connected with a power supply end and is grounded through a capacitor C1;
the input end 3 of the comparator N1A is connected with the reference voltage end P2 of the PWM control circuit;
the output terminal 1 of the comparator N1A is connected to the electronic switch N4B, and is connected to the input terminal P16 of the PWM control circuit through the resistor R2 and the diode V2 connected in series.
3. The input voltage detecting apparatus of the dual power arc welding power supply according to claim 1, wherein the voltage type latch circuit further comprises a capacitor C6, a capacitor C7, a capacitor C8, a resistor R8, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a diode V5, a state latch N4A;
after the capacitor C6 and the resistor R13 are connected in parallel, one end of the capacitor C6 is connected with the isolation module and is simultaneously connected with the joint 15 of the electronic switch N4B through the resistor R11, and the other end of the capacitor C6 is grounded;
the node between the junction 15 of the electronic switch N4B and the resistor R11 is connected with the power supply through a diode V5 and is grounded through a capacitor C7; the resistor R8 is connected with the contact 10 of the electronic switch N4B;
the contact 1 of the electronic switch N4B is grounded through a capacitor C8, and is connected with the contact 11 of the state latch N4A through a resistor R12, and is connected with the contact 14 of the state latch N4A through a resistor R15;
the joint 14 of the state latch N4A is connected with the resistor R16 and the resistor R14 after being connected in series, and a node between the resistor R16 and the resistor R14 is connected with the voltage-doubling execution circuit;
the contact 12 of the state latch N4A is grounded, and the contact 13 of the state latch N4A is connected to the power supply through the resistor R10.
4. The input voltage detecting apparatus of the dual power arc welding power supply according to claim 1, wherein the input voltage judging circuit includes a resistor R3, a resistor R6, a resistor R7, a resistor R9, a capacitor C2, a capacitor C4, a diode V3, a zener diode V4, and a comparator N2A;
after the resistor R6, the resistor R7 and the capacitor C4 are connected in parallel, one end of the resistor R6, the resistor R7 and the capacitor C4 are simultaneously connected with an input high-voltage end and the input end 2 of the comparator N2A, and the other end of the resistor R7 is grounded;
the input terminal 3 of the comparator N2A is connected with a power supply through a resistor R3 and is grounded through a capacitor C2, and the power supply terminal of the comparator N2A is connected through a diode V3;
the output end 1 of the comparator N2A is connected with the isolation module through a voltage stabilizing diode V4 and a resistor R9 which are connected in series.
5. The input voltage detecting apparatus of the dual power arc welding power supply according to claim 1, wherein the voltage doubling execution circuit includes a MOS field effect transistor, a resistor R5, a light emitting diode LED1, a capacitor C5, a relay KD1, a voltage doubling circuit board;
the source electrode of the MOS field effect transistor is grounded and is connected with a power supply through a capacitor C5 and a relay KD1 which are connected in series; the collector of the MOS field effect transistor is connected with a power supply through a light emitting diode LED1 and a resistor R5 which are connected in series; the node between the relay KD1 and the capacitor C5 is connected with the drain electrode of the MOS field effect transistor;
the normally open contact switch of the relay KD1 is connected with the voltage-doubling circuit board in series to form a loop.
6. The input voltage detection device of the dual power arc welding power supply according to claim 1, wherein the PWM control circuit employs a control chip of type UC 3846.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121352678.8U CN215498400U (en) | 2021-06-17 | 2021-06-17 | Double-power-supply type arc welding power supply input voltage detection device |
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| CN202121352678.8U CN215498400U (en) | 2021-06-17 | 2021-06-17 | Double-power-supply type arc welding power supply input voltage detection device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116893335A (en) * | 2023-07-04 | 2023-10-17 | 成都若克石油技术开发有限公司 | Electronic selector switch product cold joint inspection circuit and method |
| CN117420384A (en) * | 2023-10-13 | 2024-01-19 | 滨州新大新机电科技有限公司 | Redundant power supply power failure alarm method and circuit |
-
2021
- 2021-06-17 CN CN202121352678.8U patent/CN215498400U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116893335A (en) * | 2023-07-04 | 2023-10-17 | 成都若克石油技术开发有限公司 | Electronic selector switch product cold joint inspection circuit and method |
| CN117420384A (en) * | 2023-10-13 | 2024-01-19 | 滨州新大新机电科技有限公司 | Redundant power supply power failure alarm method and circuit |
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