CN116031857A - Commercial power misconnection prevention protection circuit and method applied to inverter welding power supply - Google Patents
Commercial power misconnection prevention protection circuit and method applied to inverter welding power supply Download PDFInfo
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- CN116031857A CN116031857A CN202211622993.7A CN202211622993A CN116031857A CN 116031857 A CN116031857 A CN 116031857A CN 202211622993 A CN202211622993 A CN 202211622993A CN 116031857 A CN116031857 A CN 116031857A
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Abstract
The invention relates to a mains supply erroneous connection prevention protection circuit and a method applied to an inverter welding power supply, wherein the protection circuit comprises an input voltage conversion circuit, a rectification sampling circuit, a comparison control circuit, a rectification filter circuit, a voltage stabilizing circuit, a reference circuit and an input control circuit, wherein the output of the rectification sampling circuit is connected with one input of the comparison control circuit, the rectification filter circuit, the voltage stabilizing circuit and the reference circuit are sequentially connected, the output of the reference circuit is connected with the other input of the comparison control circuit, the input voltage conversion circuit is connected with the mains supply, the output of the input voltage conversion circuit is simultaneously connected with the rectification sampling circuit and the rectification filter circuit, the mains supply voltage is subjected to voltage reduction by the input voltage conversion circuit, the reference voltage is obtained after the rectification filter circuit, the voltage stabilizing circuit and the reference circuit are sequentially processed, the sampling voltage is obtained after the rectification sampling circuit is compared with the sampling voltage by the comparison control circuit, a control signal is output, and the input control circuit on the mains supply is controlled to be turned on or off. The invention can ensure the safety of the load circuit and prevent misconnection.
Description
Technical Field
The invention relates to the technical field of inverter welding power sources, in particular to a mains supply misconnection prevention protection circuit and method applied to an inverter welding power source.
Background
The utility power is usually 220V ac, but in the same scene, the voltage of the ac is 380V, in another scene, the voltage of the ac is 120V, when there are two or more kinds of ac with different voltages, the situation of misconnection can occur when the ac is connected, the ac input of the electric appliance is rated, the misconnection can cause damage to the electric appliance, and serious injury to personnel can be caused.
When welding, a 380V alternating current power supply and a 220V alternating current power supply exist at the same time, and the situation of misconnection of alternating current can occur frequently, so how to protect the welding power supply when misconnection of alternating current is a problem to be solved urgently at present.
Disclosure of Invention
The invention aims to provide a mains supply erroneous connection prevention protection circuit and method applied to an inverter welding power supply, which are used for reducing the voltage of alternating current at the input end of the mains supply, rectifying and filtering the reduced alternating current to obtain a stabilized voltage supply, so as to provide two reference voltages, sampling the reduced alternating current to obtain sampling values, comparing the sampling values with the two reference voltages respectively, controlling the input end of the mains supply to be connected with a load electric appliance when the sampling values are positioned between the two reference voltages, and controlling the input end of the mains supply to be disconnected with the load electric appliance when the sampling values are larger than an upper limit reference or smaller than a lower limit reference, so as to realize the protection of the load electric appliance when the mains supply is in erroneous connection.
In a first aspect, the above object of the present invention is achieved by the following technical solutions:
the utility model provides a be applied to inverter welding power supply's commercial power and prevent misconnection protection circuit, including input voltage conversion circuit, rectification sampling circuit, comparison control circuit, rectification filter circuit, voltage stabilizing circuit, reference circuit, input control circuit, rectification sampling circuit's output is connected one input of comparison control circuit, rectification filter circuit, voltage stabilizing circuit, reference circuit connects gradually, reference circuit's output is connected comparison control circuit's another input, input voltage conversion circuit's input is connected the commercial power, its output connects rectification sampling circuit and rectification filter circuit simultaneously, the commercial power voltage obtains the reference voltage after the input voltage conversion circuit step-down, obtain the reference voltage after rectification filter circuit, voltage stabilizing circuit, reference circuit's processing in proper order, obtain the sampling voltage after the comparison control circuit compares reference voltage with the sampling voltage, output control signal, control commercial power on-line's input control circuit switch-on or break.
The invention is further provided with: the power supply circuit also comprises a switch circuit, an input control circuit and a load circuit which are sequentially connected on the power supply circuit, wherein the switch circuit is used for controlling whether the power supply is connected in or not, and the input control circuit is used for controlling the on or off of the power supply circuit according to a control signal of the comparison control circuit.
The invention is further provided with: the rectification sampling circuit comprises a rectification circuit and a sampling circuit which are sequentially connected, the rectification circuit rectifies alternating current output by the input voltage conversion circuit, and the sampling circuit samples the rectification voltage to obtain a sampling value.
The invention is further provided with: the reference circuit comprises two reference sub-circuits, each of which is used for outputting a reference value for corresponding upper and lower limits respectively.
The invention is further provided with: the comparison control circuit comprises a first comparison circuit, a second comparison circuit and a control circuit, wherein the input of the control circuit is connected with the outputs of the first comparison circuit and the second comparison circuit, the first comparison circuit is used for comparing a sampling value with a first reference voltage, the second comparison circuit is used for comparing the sampling value with a second reference voltage, and the control circuit outputs a control signal according to the comparison result of the first comparison circuit and the comparison result of the second comparison circuit.
The invention is further provided with: the first comparison circuit comprises a first comparison sub-circuit and an inverse circuit which are sequentially connected, and when the sampling value is greater than or equal to a first reference voltage, the first comparison sub-circuit outputs high voltage and outputs low level after passing through the inverse circuit; when the sampling value is smaller than the first reference voltage, the first comparison sub-circuit outputs low voltage, and the reverse circuit is in a high-resistance state.
The invention is further provided with: the second comparison circuit comprises a second comparison sub-circuit, and when the sampling value is more than or equal to a second reference voltage, the second comparison sub-circuit outputs high voltage; when the sampling value is smaller than the second reference voltage, the second comparison sub-circuit outputs low voltage; the control circuit comprises an NPN triode, the base electrode of the triode is connected with the output ends of the first comparison circuit and the second comparison circuit, the emitter electrode of the triode is grounded, and the collector electrode of the triode is connected with the input end of the input control circuit.
The invention is further provided with: the input voltage conversion circuit comprises a transformer and a current limiting circuit, wherein the primary side of the transformer is connected with the mains supply circuit, and the secondary side of the transformer is connected with the current limiting circuit and used for protecting the transformer.
The invention is further provided with: the input control circuit comprises a relay, one end of a coil of the relay is connected with the output of the comparison control circuit, the other end of the coil of the relay is connected with the power output end of the voltage stabilizing circuit, and two switch ends of the relay are connected in series on one input line of the mains supply circuit and used for controlling the on-off of the mains supply circuit.
In a second aspect, the above object of the present invention is achieved by the following technical solutions:
the utility power anti-misconnection protection method applied to the inverter welding power supply comprises the steps of obtaining a stabilized voltage power supply after voltage reduction of input on a utility power circuit, and providing a power supply and two reference voltages, wherein the two reference voltages respectively correspond to the upper limit and the lower limit of the utility power voltage, rectifying alternating current after voltage reduction to obtain sampling values, comparing the sampling values with the two reference voltages respectively, and controlling the connection of the utility power circuit when the sampling values are positioned between the two reference voltages; when the sampling value is greater than or equal to the upper limit or less than or equal to the lower limit, the commercial power circuit is controlled to be disconnected, and the erroneous connection of the commercial power is avoided.
Compared with the prior art, the beneficial technical effects of this application are:
1. according to the method, the sampling value is obtained by reducing and rectifying the mains supply, the sampling value is respectively compared with the upper limit reference and the lower limit reference, and when the mains supply voltage is in the protection range, the load is connected, so that the protection of a load electric appliance is realized;
2. further, the sampling value is obtained after the commercial power is subjected to voltage reduction and rectification, so that timeliness and authenticity of the sampling value are guaranteed, and accuracy of commercial power protection is improved;
3. further, after the commercial power is subjected to voltage reduction, rectification and filtration, stable voltage is obtained, and the voltage regulator is used for providing reference voltage while providing power for the protection circuit, so that the problem of obtaining the power supply and the reference voltage of the protection circuit is solved, and the circuit is simplified;
4. furthermore, the protection in the false connection can be realized by adjusting the voltage values of the two reference voltages, and the protection of the load in the case of large voltage fluctuation of the mains supply can be realized.
Drawings
FIG. 1 is a schematic diagram of a protection circuit according to one embodiment of the present application;
fig. 2 is a schematic diagram of a protection circuit according to an embodiment of the present application.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The utility power erroneous connection prevention protection method applied to the inverter welding power supply is characterized in that input control is arranged on a utility power input circuit, the utility power is input to be reduced in voltage, rectification and filtering are carried out on alternating current after the voltage reduction, and then voltage stabilization is carried out to obtain stable power supply voltage, the stable power supply voltage is used for obtaining two reference voltages which are respectively used for limiting the upper limit and the lower limit of the input voltage of the utility power, and meanwhile, the voltage-stabilized power supply provides power for the protection circuit; rectifying the step-down alternating current to obtain direct current, sampling the direct current to obtain sampling values of the mains supply input voltage, comparing the sampling values with two reference voltages respectively, controlling the on of a mains supply input line when the sampling values are positioned between the two reference voltages, and controlling the off of the mains supply input line when the sampling values are larger than an upper limit reference or smaller than a lower limit reference, so as to realize the protection of load electric appliances when different mains supply voltages are input.
In this application, a load appliance includes an inverter welding power source.
The utility power misconnection-preventing protection circuit applied to the inverter welding power supply comprises an input voltage conversion circuit, a rectification sampling circuit, a comparison control circuit, a rectification filter circuit, a voltage stabilizing circuit, a reference circuit and an input control circuit, wherein the output of the input voltage conversion circuit is respectively connected with the rectification sampling circuit and the rectification filter circuit, the voltage stabilizing circuit and the reference circuit are sequentially connected, the input of the comparison control circuit is connected with the output of the rectification sampling circuit and the output of the reference circuit, and the output of the comparison control circuit is connected with the input control circuit.
The mains voltage is input into the voltage conversion circuit to obtain the reduced alternating current, the rectification sampling circuit rectifies and samples the reduced alternating current to obtain a sampling value, and the sampling value is transmitted to the comparison control circuit.
The step-down alternating current is subjected to rectification and filtering to obtain direct current, then is subjected to voltage stabilizing to obtain stable voltage, and the reference circuit divides the stable voltage to obtain reference voltage which is transmitted to the comparison control circuit.
The comparison control circuit compares the sampling value with the reference voltage to obtain a comparison result, and controls the on-off of the input control circuit according to the comparison result.
A switch circuit, an input control circuit and an inverter welding circuit are sequentially arranged on a commercial power circuit. The switching circuit and the input control circuit are used for controlling the on-off of the mains supply circuit, after the switching circuit is switched on, the input control circuit further controls the on-off of the mains supply circuit, and only after the switching circuit and the input control circuit are switched on, the inverter welding circuit can be powered on to start to operate, and when one of the switching circuit and the input control circuit is in the off condition, the inverter welding circuit cannot be powered on to work.
The input voltage conversion circuit comprises a transformer for reducing the voltage of the commercial power to obtain the reduced alternating current.
The rectification sampling circuit comprises a first rectification circuit and a sampling circuit which are connected with each other, wherein the input of the first rectification circuit is connected with the output of the input voltage conversion circuit, the rectification sampling circuit is used for rectifying the reduced alternating current to obtain a first direct current with ripple, the sampling circuit is used for sampling the first direct current to obtain a sampling value, the first direct current with ripple is sampled, no virtual current exists, and the voltage change of the alternating current can be accurately and timely obtained.
The rectification filter circuit comprises a second rectification circuit and a filter circuit which are connected with each other, and likewise, the input of the first rectification circuit is connected with the output of the input voltage conversion circuit and used for rectifying the alternating current after the voltage reduction, and the filter circuit is used for filtering the direct current with ripple waves obtained by the second rectification circuit to obtain a smooth second direct current.
The voltage stabilizing circuit carries out voltage stabilizing treatment on the second direct current to obtain a required stabilizing circuit which is used for providing a voltage stabilizing power supply for the protection circuit.
The comparison control circuit comprises a comparison circuit and a control circuit which are connected with each other, the comparison circuit compares the sampling value with the reference voltage, the control circuit outputs a control signal to the input control circuit according to the comparison result, and the input control circuit acts after receiving the control signal to turn off or turn on the mains supply circuit.
In a specific embodiment of the application, the reference circuit obtains two reference voltages, the comparison circuit compares the sampled values with the two reference voltages respectively for the upper limit voltage and the lower limit voltage on the mains supply circuit, and when the mains supply voltage is between the upper limit voltage and the lower limit voltage, the control input control circuit is controlled to be connected with the mains supply circuit so as to ensure that the inverter welding circuit works under normal mains supply; when the mains supply voltage is higher than the upper limit voltage or lower than the lower limit voltage, the control input control circuit cuts off the mains supply circuit, so that the inverter welding circuit is ensured not to work when the mains supply is abnormal, and the erroneous connection and the change of the mains supply voltage are prevented.
In a specific embodiment of the present application, a schematic diagram of a protection circuit is shown in fig. 2, and a primary side of a transformer T1, a double-control switch SW1, a relay switch end and an inverter welding circuit are sequentially connected to a mains supply circuit.
The primary of the transformer T1 is connected with two input ends of the mains supply, one end of the secondary of the transformer T1 is connected with a current limiting resistor R1, the other end of the current limiting resistor R1 and the other end of the secondary are used as output of an input voltage conversion circuit, and the current limiting resistor R1 is used for preventing the transformer T1 from being burnt out due to overlarge current when a protection circuit is short-circuited.
The alternating current after the step-down of the transformer T1 is filtered through a filter circuit consisting of a parallel capacitor C1/C2 after passing through a first full-bridge rectifying circuit BD1, and the input voltage is stabilized by a voltage stabilizing circuit U1 to obtain a stabilized power supply voltage, wherein the stabilized power supply voltage is 12V.
The ac power reduced by the transformer T1 is passed through the second full-bridge rectifier circuit BD2 to obtain dc power having ripple.
The first series resistor combination consisting of the resistors R2/R3/R5 forms a sampling circuit, and a sampling point is selected on the series point of the third resistor R3 and the fifth resistor R5 to obtain a sampling value.
The second series resistor combination formed by the resistors R7/R8 forms a first reference circuit, the second series resistor combination is connected between the 12V regulated power supply and the ground, and a first series point of the seventh resistor R7 and the eighth resistor R8 is used for obtaining a first reference voltage V1.
And a third series resistor combination consisting of resistors R10/R11 is used for forming a second reference circuit, and the third series resistor combination is connected between the 12V regulated power supply and the ground, and a second series point of the tenth resistor R10 and the eleventh resistor R11 is used for obtaining a second reference voltage V2.
The positive input end of the first comparator U2A is connected to the sampling point through a fourth resistor R4, and the negative input end of the first comparator U2A is connected to a first series point of the second series resistor combination and is used for comparing the sampling value with a first reference voltage V1 to obtain a first comparison result.
The positive input end of the second comparator U2B is connected to the sampling point through a fourth resistor R4, and the negative input end of the second comparator U2B is connected to a second series point of the third series resistor combination and is used for comparing the sampling value with a second reference voltage V2 to obtain a second comparison result.
The control circuit comprises a first NPN triode Q1 and a second NPN triode Q2, wherein the base electrode of the first NPN triode Q1 is connected to the output end of the first comparator U2A through a sixth resistor R6, the emitter electrode of the first NPN triode Q is grounded, and the collector electrode of the first NPN triode Q is connected to the base electrode of the second NPN triode Q2.
The base of the second NPN triode Q2 is connected to the output terminal of the second comparator U2B through the ninth resistor R9, the emitter thereof is grounded, and the collector thereof is connected to the input terminal of the input control circuit.
The base of the second NPN triode Q2 is further connected to one end of the twelfth resistor R12, and the other end of the twelfth resistor R12 is grounded and used for clamping the base voltage of the second NPN triode Q2.
The input control circuit comprises a relay K1, one end of a coil of the relay K1 is connected with a power end of the voltage stabilizing circuit, the other end of the coil of the relay K1 is connected with a collector electrode of the second NPN triode Q2, and two switch ends of the coil of the relay K1 are connected in series on one input line of the mains supply circuit and used for connecting or disconnecting the input line.
In one specific embodiment of the application, the relay is provided with two relays which are respectively connected to two input lines of the mains supply circuit; or the relay is correspondingly provided with two switches which are respectively connected in series with two input lines of the mains supply, and meanwhile, the on or off of the input lines of the mains supply is controlled.
The embodiment of the invention relates to a mains supply misconnection prevention protection circuit applied to an inverter welding power supply, which comprises the following implementation principle:
after the commercial power voltage is reduced by the transformer T1, the commercial power voltage is rectified by the first full-bridge rectifying circuit BD1 and then is filtered by the filter circuit, the commercial power voltage is input into the regulated power supply U1, and the regulated power supply U1 outputs 12V regulated voltage to provide power for the protection circuit. The two different reference circuits divide the voltage of the stabilized power supply to obtain two reference voltages, which correspond to the upper limit and the lower limit of the mains voltage respectively.
After the mains voltage is reduced by the transformer T1, the mains voltage is rectified by the second full-bridge rectifying circuit BD2 to obtain direct current with ripple, the first series resistor combination divides the direct current with ripple to obtain a sampling value, and the sampling value can timely and accurately reflect the change of the mains voltage.
Comparing the sampling value with two reference voltages respectively, when the sampling value is between the upper limit reference voltage and the lower limit reference voltage, the corresponding mains supply is between the upper limit and the lower limit of the mains supply voltage, at the moment, two comparison circuits U2A/U2B form a hysteresis comparator circuit, the base electrode of the second NPN triode Q2 is high potential, the second NPN triode Q2 is conducted, current flows through the coil of the relay K1, the relay K1 is attracted, the relay switch is closed, one input line of the mains supply circuit is connected, and the load-inverter welding power supply is powered on.
When the first reference voltage is larger than the second reference voltage and the mains voltage exceeds the set mains upper limit voltage, the sampling value is larger than the first reference voltage, the first comparator U2A outputs a high level, similarly, the sampling value is larger than the second reference voltage, and the second comparator U2B outputs a high level.
The high level output by the first comparator U2A enables the first NPN triode Q1 to be conducted, the high level is changed into the low level through the reverse direction of the first NPN triode Q1, the base electrode of the second NPN triode Q2 is clamped at the low level, the second NPN triode Q2 is cut off, the relay T1 cannot be conducted electrically, the two switch ends of the relay are disconnected, and the inverter welding power supply cannot work electrically.
When the mains voltage is smaller than the set mains upper limit voltage, the sampling value is smaller than the first reference voltage, the first comparator U2A outputs a low level, similarly, the sampling value is smaller than the second reference voltage, and the second comparator U2B outputs a high level.
The low level output by the first comparator U2A enables the collector electrode of the first NPN triode Q1 to be in a high resistance state, the low level output by the second comparator U2B enables the second NPN triode Q2 to be cut off, the relay T1 cannot be conducted electrically, two switch ends of the relay are disconnected, and the inverter welding power supply cannot work electrically.
The above embodiments are not intended to limit the scope of the present invention, so: all equivalent changes in structure, shape and principle of the invention should be covered in the scope of protection of the invention.
Claims (10)
1. Be applied to inverter welding power's commercial power and prevent misconnection protection circuit, its characterized in that: the input voltage conversion circuit is connected with the commercial power, the output of the input voltage conversion circuit is simultaneously connected with the rectification sampling circuit and the rectification filtering circuit, the commercial power is reduced by the input voltage conversion circuit, the reference voltage is obtained after the rectification filtering circuit, the voltage stabilizing circuit and the reference circuit are sequentially processed, the sampling voltage is obtained after the rectification sampling circuit, the comparison control circuit compares the reference voltage with the sampling voltage, a control signal is output, and the input control circuit on the commercial power is controlled to be switched on or off.
2. The utility power misconnection prevention protection circuit for an inverter welding power supply of claim 1, wherein: the power supply circuit also comprises a switch circuit, an input control circuit and a load circuit which are sequentially connected on the power supply circuit, wherein the switch circuit is used for controlling whether the power supply is connected in or not, and the input control circuit is used for controlling the on or off of the power supply circuit according to a control signal of the comparison control circuit.
3. The utility power misconnection prevention protection circuit for an inverter welding power supply of claim 1, wherein: the rectification sampling circuit comprises a rectification circuit and a sampling circuit which are sequentially connected, the rectification circuit rectifies alternating current output by the input voltage conversion circuit, and the sampling circuit samples the rectification voltage to obtain a sampling value.
4. The utility power misconnection prevention protection circuit for an inverter welding power supply of claim 1, wherein: the reference circuit comprises two reference sub-circuits, each of which is used for outputting a reference value for corresponding upper and lower limits respectively.
5. The utility power misconnection prevention protection circuit for an inverter welding power supply of claim 4, wherein: the comparison control circuit comprises a first comparison circuit, a second comparison circuit and a control circuit, wherein the input of the control circuit is connected with the outputs of the first comparison circuit and the second comparison circuit, the first comparison circuit is used for comparing a sampling value with a first reference voltage, the second comparison circuit is used for comparing the sampling value with a second reference voltage, and the control circuit outputs a control signal according to the comparison result of the first comparison circuit and the comparison result of the second comparison circuit.
6. The utility power misconnection prevention protection circuit for an inverter welding power supply of claim 5, wherein: the first comparison circuit comprises a first comparison sub-circuit and an inverse circuit which are sequentially connected, and when the sampling value is greater than or equal to a first reference voltage, the first comparison sub-circuit outputs high voltage and outputs low level after passing through the inverse circuit; when the sampling value is smaller than the first reference voltage, the first comparison sub-circuit outputs low voltage, and the reverse circuit is in a high-resistance state.
7. The utility power misconnection prevention protection circuit for an inverter welding power supply of claim 5, wherein: the second comparison circuit comprises a second comparison sub-circuit, and when the sampling value is more than or equal to a second reference voltage, the second comparison sub-circuit outputs high voltage; when the sampling value is smaller than the second reference voltage, the second comparison sub-circuit outputs low voltage; the control circuit comprises an NPN triode, the base electrode of the triode is connected with the output ends of the first comparison circuit and the second comparison circuit, the emitter electrode of the triode is grounded, and the collector electrode of the triode is connected with the input end of the input control circuit.
8. The utility power misconnection prevention protection circuit for an inverter welding power supply of claim 1, wherein: the input voltage conversion circuit comprises a transformer and a current limiting circuit, wherein the primary side of the transformer is connected with the mains supply circuit, and the secondary side of the transformer is connected with the current limiting circuit and used for protecting the transformer.
9. The utility power misconnection prevention protection circuit for an inverter welding power supply of claim 1, wherein: the input control circuit comprises a relay, one end of a coil of the relay is connected with the output of the comparison control circuit, the other end of the coil of the relay is connected with the power output end of the voltage stabilizing circuit, and two switch ends of the relay are connected in series on one input line of the mains supply circuit and used for controlling the on-off of the mains supply circuit.
10. A mains supply misconnection prevention protection method applied to an inverter welding power supply is characterized in that: the method comprises the steps of reducing voltage of input on a mains supply circuit to obtain a stabilized voltage supply, providing a power supply and two reference voltages, wherein the two reference voltages respectively correspond to the upper limit and the lower limit of the mains supply voltage, rectifying the reduced alternating current to obtain sampling values, comparing the sampling values with the two reference voltages respectively, and controlling the mains supply circuit to be connected when the sampling values are located between the two reference voltages; when the sampling value is greater than or equal to the upper limit or less than or equal to the lower limit, the commercial power circuit is controlled to be disconnected, and the erroneous connection of the commercial power is avoided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211622993.7A CN116031857A (en) | 2022-12-16 | 2022-12-16 | Commercial power misconnection prevention protection circuit and method applied to inverter welding power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211622993.7A CN116031857A (en) | 2022-12-16 | 2022-12-16 | Commercial power misconnection prevention protection circuit and method applied to inverter welding power supply |
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| CN116031857A true CN116031857A (en) | 2023-04-28 |
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| CN202211622993.7A Pending CN116031857A (en) | 2022-12-16 | 2022-12-16 | Commercial power misconnection prevention protection circuit and method applied to inverter welding power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117613837A (en) * | 2023-12-05 | 2024-02-27 | 唐山标先电子有限公司 | Phase-dislocation protection circuit and method for three-phase four-wire system electric equipment and application of phase-dislocation protection circuit and method |
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2022
- 2022-12-16 CN CN202211622993.7A patent/CN116031857A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117613837A (en) * | 2023-12-05 | 2024-02-27 | 唐山标先电子有限公司 | Phase-dislocation protection circuit and method for three-phase four-wire system electric equipment and application of phase-dislocation protection circuit and method |
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