CN111308160A - Voltage detection circuit with self-locking function for electric welding machine - Google Patents
Voltage detection circuit with self-locking function for electric welding machine Download PDFInfo
- Publication number
- CN111308160A CN111308160A CN202010135813.7A CN202010135813A CN111308160A CN 111308160 A CN111308160 A CN 111308160A CN 202010135813 A CN202010135813 A CN 202010135813A CN 111308160 A CN111308160 A CN 111308160A
- Authority
- CN
- China
- Prior art keywords
- voltage
- circuit unit
- self
- electric welding
- welding machine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
Abstract
The invention discloses a voltage detection circuit with a self-locking function for an electric welding machine, which comprises an isolation circuit unit, a self-locking circuit unit, a driving circuit unit and a switch circuit unit which are connected in sequence; the isolation circuit unit is connected with a voltage input port, and the switch circuit unit is connected with a capacitance voltage-multiplying unit of the electric welding machine; the isolation circuit unit is used for isolating the fluctuation of the input voltage and setting a voltage threshold; the self-locking circuit unit is used for locking and sending a conduction control signal to the drive circuit unit only when the voltage is greater than a set value; the driving circuit unit is used for outputting a control signal to control the on-off of the switch circuit unit; the switch circuit unit is used for controlling the starting and the closing of the capacitance voltage doubling circuit. Through the improvement of the circuit structure, whether the voltage doubling circuit needs to be started or not can be judged by automatically detecting the input voltage, the self-locking function can be realized, and compared with the prior art, the voltage doubling circuit is simple in structure, stable in function, low in cost and good in effect.
Description
Technical Field
The invention relates to the field of electric welding machines, in particular to a voltage detection circuit with a self-locking function for an electric welding machine.
Background
The electric welding machines on the market can be suitable for the commercial variable voltage of 220V and can also be suitable for the commercial variable voltage of 380V. When the accessed voltage is 220V, a capacitor voltage doubling circuit of the electric welding machine needs to be started, and when the accessed voltage is 380V, the capacitor voltage doubling circuit does not need to be started.
Most of electric welding machines in the market at present are provided with generators, the power grid input voltage of the electric welding machines can fluctuate frequently, sometimes, the voltage drops to more than 100 volts from 380 volts instantly, then jumps to more than 380 volts instantly, the traditional electric welding machines start a capacitance voltage doubling circuit module of a circuit board at the moment, and high-voltage doubling can damage power devices such as IGBTs (insulated gate bipolar translator) and the like, so that the electric welding machines cannot work normally.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a voltage detection circuit with a self-locking function for an electric welding machine, which can detect the current input voltage and control the starting of a voltage doubling circuit of the electric welding machine, and aims to solve the problem that the electric welding machine is damaged due to overhigh input voltage caused by the fact that the voltage doubling circuit is started by mistake when the voltage of the existing electric welding machine fluctuates.
The technical scheme of the invention is as follows:
a voltage detection circuit with a self-locking function for an electric welding machine comprises an isolation circuit unit, a self-locking circuit unit, a driving circuit unit and a switch circuit unit which are sequentially connected; the isolation circuit unit is connected with a voltage input port, and the switch circuit unit is connected with a capacitance voltage-multiplying unit of the electric welding machine;
the isolation circuit unit is used for isolating the fluctuation of the input voltage and setting a voltage threshold;
the self-locking circuit unit is used for locking and sending a conduction control signal to the drive circuit unit only when the voltage is greater than a set value;
the driving circuit unit is used for outputting a control signal to control the on-off of the switch circuit unit;
the switch circuit unit is used for controlling the starting and the closing of the capacitance voltage doubling circuit.
The voltage detection circuit with the self-locking function for the electric welding machine is characterized in that the voltage threshold value is any value between 260V and 280V, and is preferably set to be 280V.
The voltage detection circuit with the self-locking function for the electric welding machine is characterized in that the isolation circuit unit comprises an optical coupler device PC817, one end of the input end of the optical coupler device PC817 is connected with a seventh port 7 in an interface terminal MK5 through a bidirectional high-voltage stabilizing diode D2, the other end of the input end of the optical coupler device PC817 is connected with a ninth port 9 in an interface terminal MK5, one end of the output end of the optical coupler device PC817 is connected with a power supply voltage VCC, and the other end of the output end of the optical coupler device PC817 is connected with a control electrode of a controllable silicon Q1 (100-6) of the self-locking circuit.
The voltage detection circuit with the self-locking function for the electric welding machine is characterized in that the self-locking circuit unit comprises a controlled silicon Q1 (100-6), a control electrode of the controlled silicon is connected with a voltage stabilizing diode D7, and when an optical coupler device is switched on, a 12V power VCC breaks down the voltage stabilizing diode D7, so that the controlled silicon is switched on.
The voltage detection circuit with the self-locking function for the electric welding machine is characterized in that the driving circuit unit comprises a field effect transistor Q4, the base electrode of the field effect transistor Q4 is connected with a controlled silicon, and the base electrode potential of the field effect transistor Q4 is pulled down after the controlled silicon is conducted; an emitter of the field effect transistor Q4 is connected with a relay JDQ2 through a port 2 of an interface terminal MK5, and when the potential is pulled down, a low level signal is output to the relay to enable the relay to be conducted; the collector of the field effect transistor Q4 is grounded.
The voltage detection circuit with the self-locking function for the electric welding machine is characterized in that the switch circuit unit comprises a relay, and a first port of the relay JDQ2 is connected with a power supply VCC; the second port of the relay is connected with the control signal output end of the driving circuit unit; the third port of the relay is grounded through a variable resistor; and the fourth port of the relay JDQ2 is connected with a capacitance voltage-multiplying unit 00.
Has the advantages that: the voltage detection circuit with the self-locking function for the electric welding machine, provided by the invention, can realize automatic detection of the magnitude of input voltage to judge whether a voltage doubling circuit needs to be started or not through improvement on a circuit structure, and also can realize the self-locking function.
Drawings
FIG. 1 is a schematic block diagram of a voltage detection circuit with a self-locking function for an electric welding machine according to the present invention.
FIG. 2 is a diagram of an input/output main circuit of the voltage detection circuit with self-locking function for the electric welding machine of the present invention.
FIG. 3 is a voltage detection circuit diagram of the voltage detection circuit with self-locking function for the electric welding machine according to the present invention.
Detailed Description
The invention provides a voltage detection circuit with a self-locking function for an electric welding machine, and the invention is further described in detail below in order to make the purpose, technical scheme and effect of the invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the voltage detection circuit with self-locking function for an electric welding machine provided by the invention comprises an isolation circuit unit, a self-locking circuit unit, a driving circuit unit and a switch circuit unit which are connected in sequence; the isolation circuit unit is connected with a voltage input port, and the switch circuit unit is connected with a capacitance voltage-multiplying unit of the electric welding machine.
The isolation circuit unit is used for isolating the fluctuation of input voltage and setting a voltage threshold, wherein the voltage threshold is set to be any value between 260V and 280V, and the preferred voltage threshold is set to be 280V.
The self-locking circuit unit is used for locking and sending a conduction control signal to the drive circuit unit only when the voltage is greater than a set value.
The driving circuit unit is used for outputting a control signal to control the on-off of the switch circuit unit.
The switch circuit unit is used for controlling the starting and the closing of the capacitance voltage doubling circuit.
In the voltage detection circuit with the self-locking function for the electric welding machine, a filter circuit unit is further arranged on the self-locking circuit unit.
When the access voltage is greater than 280V, the electric welding machine considers that the access voltage is high voltage, the isolation circuit unit is conducted at the moment, and then the self-locking circuit unit is conducted, so that the driving circuit unit controls the switch circuit unit to be conducted, the capacitor voltage doubling unit is closed by short circuit at the moment, and the capacitor voltage doubling is not needed. If the access voltage is less than 280V, the switch circuit unit is disconnected at the moment, the capacitor voltage doubling unit is normally started, the voltage doubling operation is carried out on the output voltage, and the welding effect is guaranteed.
Referring to fig. 2, the seventh port 7 and the ninth port 9 of the interface terminal MK5 are voltage input ports, and the rectifying unit U1 is connected to the voltage input port to rectify the input voltage and then input the rectified voltage to the capacitance voltage doubling unit 00; the capacitor voltage doubling unit 00 is connected with a relay JDQ2, and the output end of a capacitor C3 of the capacitor voltage doubling circuit 00 is a voltage output port; the relay JDQ2 is a switching circuit unit for controlling the circuit path and short circuit of the voltage-multiplying portion in the voltage-multiplying circuit. Specifically, a first port of the relay JDQ2 is connected to a voltage VCC; the second port of the relay is connected with the second port 2 of the interface terminal MK 5; the third port of the relay is grounded through a variable resistor; a fourth port of the relay JDQ2 is connected with a capacitor voltage doubling unit 00; the second port 2 of the interface terminal MK5 is connected to the control signal output terminal of the driving circuit unit.
As shown in fig. 3, according to a specific circuit implementation of the voltage detection circuit with the self-locking function provided by the present invention, the isolation circuit unit 11 includes an optical coupler PC817, one end of an input end of the optical coupler PC817 is connected to the seventh port 7 of the interface terminal MK5 through a bidirectional high voltage zener diode D2, the other end of the input end of the optical coupler PC817 is connected to the ninth port 9 of the interface terminal MK5, one end of an output end of the optical coupler PC817 is connected to a power source VCC, and the other end of the output end of the optical coupler PC817 is connected to a control electrode of a thyristor Q1 (100-6) of the self-locking circuit unit 22. When the input voltage is larger than 280V, the bidirectional high-voltage stabilizing diode D2 is conducted, and the optical coupler is conducted. The lowest voltage value of the conducting optocoupler device is set by selecting the bidirectional high-voltage stabilizing diode D2 with different model values.
The self-locking circuit unit 22 comprises a controllable silicon Q1 (100-6), and the control electrode of the controllable silicon is connected with a voltage stabilizing diode D7. When the optocoupler is switched on, the 12V power VCC breaks down the zener diode D7, so that the thyristor is switched on. In order to ensure the safety of the controllable silicon, a filter circuit unit 22 is arranged on a circuit connecting the voltage stabilizing diode D7 and the controllable silicon control electrode.
The driving circuit unit comprises a field effect transistor Q4, the base electrode of the field effect transistor Q4 is connected with a controlled silicon, and the base electrode potential of the field effect transistor Q4 is pulled low after the controlled silicon is conducted; an emitter of the field effect transistor Q4 is connected with a relay JDQ2 through a port 2 of an interface terminal MK5, and when the potential is pulled down, a low level signal is output to the relay to enable the relay to be conducted; the collector of the field effect transistor Q4 is grounded.
The interface terminal MK5 in fig. 2 and fig. 3 is a pair of opposite plug terminals, wherein the seventh port 7 and 9 in the interface terminal MK5 is connected to the mains, when the connection voltage is greater than 280V (common connection 510V, 300V), the bidirectional high voltage zener diode D2 is connected to make the optical coupler conductive, further, the voltage of 12V breaks down the zener diode D7, then the thyristor 100-6 is connected, the ground potential of the thyristor is pulled down to make the fet conductive, and then the relay is connected to control the capacitor voltage doubling circuit connected to the relay to be short-circuited and closed. When the access voltage is less than 280V, the capacitance voltage doubling circuit is switched on at the moment, and voltage doubling operation is carried out on the output voltage.
The invention has the advantages that the electric welding machine is provided with the optocoupler and the controllable silicon, has a self-locking function while detecting the input voltage, and can be protected. By arranging the optocoupler and the controllable silicon, the capacitor voltage doubling circuit controlled by the relay is closed only when the voltage is greater than 280V. At the moment, even if the voltage of an electric plate of the electric welding machine during working drops to more than 100V, the capacitance voltage doubling circuit module cannot be started so as to protect devices, namely, the self-locking function. A voltage detection circuit for electric welding take self-locking function passes through the improvement on the circuit structure, can realize that the size of automated inspection input voltage judges whether need start voltage doubling circuit, can also realize self-locking function, compares prior art simple structure, and the function is stable, and is with low costs effectual moreover.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (8)
1. A voltage detection circuit with a self-locking function for an electric welding machine is characterized by comprising an isolation circuit unit, a self-locking circuit unit, a driving circuit unit and a switch circuit unit which are sequentially connected;
the isolation circuit unit is connected with a voltage input port, and the switch circuit unit is connected with a capacitance voltage-multiplying unit of the electric welding machine;
the isolation circuit unit is used for isolating the fluctuation of the input voltage and setting a voltage threshold;
the self-locking circuit unit is used for locking and sending a conduction control signal to the drive circuit unit only when the voltage is greater than a set value;
the driving circuit unit is used for outputting a control signal to control the on-off of the switch circuit unit;
the switch circuit unit is used for controlling the starting and the closing of the capacitance voltage doubling circuit.
2. The voltage detection circuit with the self-locking function for the electric welding machine as claimed in claim 1, wherein the voltage threshold is in a range of 260v to 280 v.
3. The voltage detection circuit with self-locking function for electric welding machine according to claim 2, characterized in that the voltage threshold is preferably set to 280V.
4. The voltage detection circuit with the self-locking function for the electric welding machine according to claim 1, wherein the isolation circuit unit comprises an optical coupler, one end of an input end of the optical coupler is connected with a seventh port in the interface terminal through a voltage stabilizing diode, the other end of the input end of the optical coupler is connected with a ninth port in the interface terminal, one end of an output end of the optical coupler is connected with a power supply voltage, and the other end of the output end of the optical coupler is connected with a control electrode of a thyristor of the self-locking circuit unit through the voltage stabilizing diode.
5. The voltage detection circuit with the self-locking function for the electric welding machine according to claim 4, wherein the voltage threshold of the conducting optocoupler device is set by selecting the bidirectional high-voltage Zener diodes with different model values.
6. The voltage detection circuit with the self-locking function for the electric welding machine according to claim 4, wherein the self-locking circuit unit comprises a silicon controlled rectifier, a control electrode of the silicon controlled rectifier is connected with a voltage stabilizing diode, and after the optical coupling device is conducted, 12V power supply voltage breaks down the voltage stabilizing diode to realize conduction of the silicon controlled rectifier.
7. The voltage detection circuit with the self-locking function for the electric welding machine according to claim 4, wherein the driving circuit unit comprises a field effect transistor, a base of the field effect transistor is connected with a thyristor, and the base potential of the field effect transistor is pulled down after the thyristor is conducted; the emitter of the field effect transistor is connected with the relay through a second port of the interface terminal, and when the potential is pulled down, a low level signal is output to the relay to enable the relay to be conducted; and the collector of the field effect transistor is grounded.
8. The voltage detection circuit with self-locking function for electric welding machine as claimed in claim 4, wherein said switching circuit unit comprises a relay, a first port of said relay being connected to a power supply voltage; the second port of the relay is connected with the emitting electrode of the field effect tube; the third port of the relay is grounded through a variable resistor; and the fourth port of the relay is connected with a capacitance voltage-multiplying unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010135813.7A CN111308160A (en) | 2020-03-02 | 2020-03-02 | Voltage detection circuit with self-locking function for electric welding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010135813.7A CN111308160A (en) | 2020-03-02 | 2020-03-02 | Voltage detection circuit with self-locking function for electric welding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111308160A true CN111308160A (en) | 2020-06-19 |
Family
ID=71158485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010135813.7A Pending CN111308160A (en) | 2020-03-02 | 2020-03-02 | Voltage detection circuit with self-locking function for electric welding machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111308160A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111969999A (en) * | 2020-06-28 | 2020-11-20 | 上海宇航系统工程研究所 | Reliable carrier rocket separation signal isolation detection and self-locking circuit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202749795U (en) * | 2012-07-09 | 2013-02-20 | 上海米勒焊接设备有限公司 | Power-up overvoltage protection circuit of electric welding machine |
| CN203992757U (en) * | 2014-06-24 | 2014-12-10 | 台州松本电器科技有限公司 | A kind of overvoltage crowbar of electric welding machine |
| CN105098966A (en) * | 2015-06-26 | 2015-11-25 | 天长市富安电子有限公司 | Power supply switching circuit |
| CN106270943A (en) * | 2016-10-17 | 2017-01-04 | 浙江普尔尼机电有限公司 | A kind of twin voltage input automatic switching control circuit being applied to electric welding machine |
| CN206293886U (en) * | 2017-01-05 | 2017-06-30 | 上海米勒焊接设备有限公司 | A kind of dual-protection circuit of electric welding machine voltage-multiplying circuit |
-
2020
- 2020-03-02 CN CN202010135813.7A patent/CN111308160A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202749795U (en) * | 2012-07-09 | 2013-02-20 | 上海米勒焊接设备有限公司 | Power-up overvoltage protection circuit of electric welding machine |
| CN203992757U (en) * | 2014-06-24 | 2014-12-10 | 台州松本电器科技有限公司 | A kind of overvoltage crowbar of electric welding machine |
| CN105098966A (en) * | 2015-06-26 | 2015-11-25 | 天长市富安电子有限公司 | Power supply switching circuit |
| CN106270943A (en) * | 2016-10-17 | 2017-01-04 | 浙江普尔尼机电有限公司 | A kind of twin voltage input automatic switching control circuit being applied to electric welding machine |
| CN206293886U (en) * | 2017-01-05 | 2017-06-30 | 上海米勒焊接设备有限公司 | A kind of dual-protection circuit of electric welding machine voltage-multiplying circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111969999A (en) * | 2020-06-28 | 2020-11-20 | 上海宇航系统工程研究所 | Reliable carrier rocket separation signal isolation detection and self-locking circuit |
| CN111969999B (en) * | 2020-06-28 | 2023-08-11 | 上海宇航系统工程研究所 | Reliable carrier rocket separation signal isolation detection and self-locking circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6044519A (en) | Portable electric tool vacuum cleaner control | |
| CN108777573B (en) | AC solid-state relay | |
| CN106841762A (en) | Zero cross detection circuit and home appliance | |
| CN107359608A (en) | A kind of direct current prevents reversed protection circuit | |
| CN111308160A (en) | Voltage detection circuit with self-locking function for electric welding machine | |
| CN104201939A (en) | Control system of AC (alternate current) motor | |
| CN105680418B (en) | A kind of load motor protection circuit, fan and air-conditioning | |
| CN205946252U (en) | Led actuating device | |
| CN209946327U (en) | Detection circuit of relay contact and power supply device | |
| CN104039034A (en) | Circuit arrangement and method for operating at least one luminous means | |
| CN105529679B (en) | IGBT protection of pipe method, protection circuit and the power module using the protection circuit | |
| CN110890783A (en) | Hot plug slow start circuit and hot-pluggable equipment | |
| CN213661448U (en) | Short-circuit protection circuit for LLC resonant power supply | |
| CN211266446U (en) | Circuit breaker protection device | |
| CN209946325U (en) | Double-control switch detection circuit and device | |
| CN207801885U (en) | The driving detection device and electric discharge device of electric discharge metal-oxide-semiconductor | |
| CN203813714U (en) | Motor driving device and frequency-conversion household electrical appliance | |
| CN207408524U (en) | Control box has access to electricity short-circuit detecting circuit on charging gun cable | |
| CN112014621A (en) | Current detection circuit, switching power supply and television | |
| CN217769474U (en) | Overcurrent protection circuit and device of switching device and driving power supply | |
| CN109545620A (en) | A kind of the protection circuit and method of relay | |
| CN210246635U (en) | Automatic time-delay starting or automatic soft starting system | |
| CN205882682U (en) | IGBT short -circuit protection circuit and fan control circuit who uses thereof | |
| CN109795429A (en) | A kind of Vehicle Controller power-supply system of discontinuous work | |
| CN216560832U (en) | Grounding detection circuit and electric appliance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200619 |
|
| RJ01 | Rejection of invention patent application after publication |