CN104135061A - Direct current supply system with leakage protection - Google Patents
Direct current supply system with leakage protection Download PDFInfo
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- CN104135061A CN104135061A CN201410335398.4A CN201410335398A CN104135061A CN 104135061 A CN104135061 A CN 104135061A CN 201410335398 A CN201410335398 A CN 201410335398A CN 104135061 A CN104135061 A CN 104135061A
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Abstract
The invention belongs to the technical field of power supply, and discloses a direct current supply system with leakage protection. The direct current supply system comprises a rectification module, a storage battery bank and a direct current leakage protection circuit, wherein a tripper of a trip operation mechanism is connected with a secondary winding of a zero sequence current transformer in the direct current leakage protection circuit; a trip switch is connected in series with a primary winding of the zero sequence current transformer; the trip switch and the primary winding are connected in series between positive and negative input ends and positive and negative output ends of a device; a first controllable switch and a first resistor are connected in series between a positive bus and an earth wire; and a second controllable switch and a second resistor are connected in series between a negative bus and the earth wire. The direct current leakage protection circuit specially designed for the direct current supply system is added to the direct current supply system, so that the safety and the reliability of the overall system are improved.
Description
Technical field
The present invention relates to power supply and uninterrupted power supply power supply technique field, refer to especially a kind of direct current supply distribution system, specifically, is a kind of with earth leakage protective DC power-supply system.
Background technology
On the surface, the power supply of household electricity equipment is all alternating current, but from its internal circuit, the power input of most of circuit has current rectifying and wave filtering circuit, its effect is the alternating current of 220V to be transformed to the direct current of 310V left and right, then further converts various direct currents or alternating voltage that equipment needs to.
At present, domestic power supply is alternating current, even if the occasion of solar cell etc. oneself generating also will be converted to alternating current by direct current and use.But, present digital household appliances as television set, PC, phone, printer, mobile phone, game machine and portable music player etc. substantially inside be all to carry out work with direct current, therefore need to interchange be converted to direct current by change-over circuit, like this from the electric power of solar cell, carry out direct current to exchanging, again by twice conversion of AC-to DC, can produce larger conversion loss, even if the conversion efficiency up to 95%, the loss of power (last conversion efficiency be 90.25%) of 1 one-tenth of also having an appointment.The particularly LED of the supreme arrogance of a person with great power illumination at present, be need to drive with DC power supply (LED with Alternating Current Power Supply is comprised of a plurality of LED chips in fact, single led or DC driven), if family introduces direct current supply, LED does not just need inverter that AC has been transformed into DC, can reduce many from cost yet.Moreover what photovoltaic technology generating was at present exported is DC power supply, must convert AC power to via inverter, then power to household internal with form of communication.Most of electrical equipment such as household electrical appliances in fact need to be via AC adapter, use after interchange is converted to direct current, therefore, solar electric power need be through direct current to exchanging, 2 conversions of AC-to DC.
Based on above-mentioned reality, existing DC power-supply system comes into operation at present, is mainly uninterrupted DC power supply.Existing continual DC power-supply system, mainly consists of rectification module and batteries, and rectification module is for becoming direct current by AC rectification, and the voltage of output is that 204V to 292V is adjustable continuously.Rectification module also charges a battery simultaneously or discharges.Batteries comprises battery management unit and at least one group storage battery.Batteries, as the non-firm power of DC power-supply system, is directly connected with the batteries link of DC bus, for when rectification module cannot be worked to power consumption equipment continued power power.
The weak point of existing DC power-supply system is, to the electric leakage of electric power system, does not provide defencive function.
Summary of the invention
Object of the present invention has just been to provide a kind of household DC electric power system.This system, for household electricity equipment provides direct current, by designing a kind of earth leakage protective device that is directed to DC power-supply system, realizes the earth leakage protective to DC power-supply system in system.
For achieving the above object, the present invention adopts following technical scheme: be a kind ofly with earth leakage protective DC power-supply system, comprise for AC rectification being become to galvanic rectification module, standby galvanic batteries and direct current leakage protection circuit being provided.
The input of rectification module is used for connecing AC power, and the positive and negative output of rectification module connects respectively the positive and negative input of direct current leakage protection circuit; The positive and negative end of batteries connects respectively the positive and negative output of rectification module.
The positive and negative output of direct current leakage protection circuit is for connecing the positive and negative end of load, and the ground wire of direct current leakage protection circuit is for being connected with load housing.
In the present invention, described rectification module, for AC rectification is become to direct current, the voltage of output is that 204V to 292V is adjustable continuously.Rectification module can also charge a battery or discharge; Rectification module has flow equalizing function, under the cooperation of supervisory control system, has sleep mode.
Rectification module comprises at least one rectification unit, and each rectification unit comprises main circuit, control circuit and auxiliary power circuit three parts.
Main circuit, comprises lightning protection unit, EMC/EMI circuit, ac filter circuit, power conversion circuit, rectification circuit, DC-DC transfer circuit, DC filtering output circuit.Three-phase alternating current input, after lightning protection unit and EMC/EMI circuit, is carried out ac filter; And then rectification output after power conversion circuit; Output to DC-DC transfer circuit, required direct current is exported in last filtering.
Control circuit, comprises input overvoltage/undervoltage protected location, current-limiting protection circuit, output overvoltage protection circuit, short-circuit protection circuit, voltage stabilizing loop, sample circuit, PFC unit, PMW control unit.Wherein PMW control unit is collected the signal of input overvoltage/undervoltage protected location, current-limiting protection circuit, output overvoltage protection circuit, short-circuit protection circuit, voltage stabilizing loop, is aggregated in power conversion circuit.Voltage stabilizing loop is Information Monitoring from sample circuit.The all Information Monitorings in the DC filtering output circuit from main circuit of sample circuit, short-circuit protection circuit, output overvoltage protection circuit, current-limiting protection circuit.In main circuit, the corresponding information of ac filter circuit is transported to respectively in input overvoltage/undervoltage protected location and PFC unit, and the information of simultaneously inputting in overvoltage/undervoltage protected location is also transported in PFC unit.
Auxiliary power circuit provides necessary power supply for control circuit.
Described batteries comprises battery management unit and at least one group storage battery.Batteries, as the non-firm power of DC power-supply system, is directly connected with the batteries link of DC bus, for when rectification module cannot be worked to power consumption equipment continued power power.
Described direct current leakage protection circuit, for guaranteeing the safety of DC power-supply system, when electric leakage occurs system somewhere circuit; the electric current flowing through in positive negative wire will be uneven, and instrument transformer will induce a voltage, thereby trigger release action; cut-off switch, guarantees Electrical Safety.
Described direct current leakage protection circuit comprises residual current circuit breaker, the first gate-controlled switch and at least one the first resistance, the second gate-controlled switch and at least one the second resistance and for controlling the ON-OFF control circuit of the first gate-controlled switch and the second gate-controlled switch break-make, inlet wire N end and the L end of described ac leakage circuit breaker connect respectively power end positive bus-bar and negative busbar, and outlet N end and L end connect respectively load end positive pole and negative pole; The first gate-controlled switch and the first resistance are connected between positive bus-bar and ground wire, and the second gate-controlled switch and the second resistance are connected between negative busbar and ground wire.
As another kind, select dropout operating mechanism, the first gate-controlled switch and at least one the first resistance, the second gate-controlled switch and at least one the second resistance that direct current leakage protection circuit can also comprise zero sequence current mutual inductor, triggered by zero sequence current mutual inductor secondary winding and for controlling the ON-OFF control circuit of the first gate-controlled switch and the second gate-controlled switch break-make; Zero sequence current mutual inductor comprises two groups of windings and one group of secondary winding, dropout operating mechanism is comprised of release and the dropout switch that driven by release, release is connected with zero sequence current mutual inductor secondary winding, a windings in series of dropout switch and zero sequence current mutual inductor and together be connected between the positive and negative input and positive and negative output of device; The first gate-controlled switch and the first resistance are connected between positive bus-bar and ground wire, and the second gate-controlled switch and the second resistance are connected between negative busbar and ground wire.
Described ON-OFF control circuit comprises two control signal outputs, connects respectively the control end of the first gate-controlled switch and the control end of the second gate-controlled switch.
Described gate-controlled switch can be anyly can by circuit, control switching device or the element of conducting and disconnection, can select relay, triode, photoelectrical coupler etc., wherein preferred light electric coupling.
For fear of the situation that occurs to be directly communicated with by the first resistance and the second resistance between positive and negative busbar, its break-make is controlled to the method that preferably adopts staggered break-make, when the switch between positive bus-bar and ground is closed, switch between negative busbar and ground disconnects, when the switch between positive bus-bar and ground disconnects, the switch between negative busbar and ground is closed.The frequency of control switch break-make is suitable in the frequency range of 40Hz ~ 60Hz, is especially preferably the frequency of alternating current in ac power supply system---50Hz.
Described ON-OFF control circuit provides the switching signal of two fixed frequencies, outputs to respectively the control end of the first gate-controlled switch and the second gate-controlled switch.
Described ON-OFF control circuit can coordinate peripheral auxiliary circuits to realize by 555 timers, be specially: ON-OFF control circuit comprises 555 timers, the square-wave signal that frequency is fixing of 3 pin outputs of 555 timers, the control end that divides two circuits to be connected respectively to two described gate-controlled switches, the reverser of wherein contacting in a circuit.
Described ON-OFF control circuit also can coordinate peripheral auxiliary circuits to realize by microcontroller, be specially: described ON-OFF control circuit comprises microcontroller, described microcontroller produces two contrary square-wave signals of low and high level that frequency is fixing, outputs to respectively the control end of two gate-controlled switches through two output interfaces of controller.
The present invention, by add the direct current leakage protection circuit that aims at DC power-supply system design in DC power-supply system, has improved the safety and reliability of whole system.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of DC power-supply system of the present invention.
Fig. 2 is rectification module structured flowchart in DC power-supply system of the present invention.
Fig. 3 is earth leakage protective device schematic diagram in DC power-supply system of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
With reference to Fig. 1; the invention provides a kind of household DC electric power system; comprise rectification module, batteries and earth leakage protective device; the input termination 220V alternating current of rectification module; the output of rectification module connects respectively the input of batteries and the input of earth leakage protective device, the various load equipments of output termination of earth leakage protective device.
Rectification module output nominal voltage is 240V, and virtual voltage is 270V, and operating voltage range is 204V to 292V, adjustable continuously.
As can be seen from Figure 1, batteries comprises at least one group storage battery.Batteries, as the non-firm power of household DC electric power system, is directly connected with the batteries link of DC bus, for when rectification module cannot be worked to power consumption equipment continued power power.
With reference to Fig. 2, rectification module, for AC rectification is become to direct current, the voltage of output is that 204V to 292V is adjustable continuously.Rectification module can also charge a battery or discharge; Rectification module has flow equalizing function, under the cooperation of supervisory control system, has sleep mode.
Rectification module comprises at least one rectification unit, and each rectification unit comprises main circuit, control circuit and auxiliary power circuit three parts.
Main circuit, comprises lightning protection unit, EMC/EMI circuit, ac filter circuit, power conversion circuit, rectification circuit, DC-DC transfer circuit, DC filtering output circuit.Its circuit is connected to the input termination 220V electric main of lightning protection unit, the input of output termination EMC/EMI circuit, the input of the output termination ac filter circuit of EMC/EMI circuit, input 1 end of the output termination power conversion circuit of ac filter circuit, the input of the output termination rectification circuit of power conversion circuit, the input of the output termination DC-DC transfer circuit of rectification circuit, the input of the output termination DC filtering output circuit of DC-DC transfer circuit.Its function is that three-phase alternating current is inputted after lightning protection unit and EMC/EMI circuit, carries out ac filter; And then rectification output after power conversion circuit; Output to DC-DC transfer circuit, required direct current is exported in last filtering.
Control circuit, comprises input overvoltage/undervoltage protected location, current-limiting protection circuit, output overvoltage protection circuit, short-circuit protection circuit, voltage stabilizing loop, sample circuit, PFC unit, PMW control unit.Its circuit is connected to the input of the output 1 termination input overvoltage/undervoltage protected location of ac filter circuit, input overvoltage/undervoltage protected location is exported the input of 1 termination PFC unit, export input 1 end of 2 termination PMW control units, output 2 ends of the input termination ac filter circuit of PFC unit, input 2 ends of the output termination power conversion circuit of PMW control unit, the output of the input 2 termination output overvoltage protection circuits of PMW control unit, the output of the input 3 termination current-limiting protection circuits of PMW control unit, the output of the input 4 termination short-circuit protection circuits of PMW control unit, the output of the input 5 termination voltage stabilizing loops of PMW control unit, the input of voltage stabilizing loop connects the output of sample circuit, output 1 end of the input termination DC filtering output circuit of sample circuit, output 2 ends of the input termination DC filtering output circuit of short-circuit protection circuit, output 3 ends of the input termination DC filtering output circuit of current-limiting protection circuit, output 4 ends of the input termination DC filtering output circuit of output overvoltage protection circuit, wherein PMW control unit is collected input overvoltage/undervoltage protected location, current-limiting protection circuit, output overvoltage protection circuit, short-circuit protection circuit, the signal of voltage stabilizing loop, be aggregated in power conversion circuit.Voltage stabilizing loop is Information Monitoring from sample circuit.The all Information Monitorings in the DC filtering output circuit from main circuit of sample circuit, short-circuit protection circuit, output overvoltage protection circuit, current-limiting protection circuit.In main circuit, the corresponding information of ac filter circuit is transported to respectively in input overvoltage/undervoltage protected location and PFC unit, and the information of simultaneously inputting in overvoltage/undervoltage protected location is also transported in PFC unit.
Auxiliary power circuit is for control circuit provides necessary power supply, and its circuit is connected to output 5 ends of auxiliary power circuit input termination DC filtering output circuit.
With reference to Fig. 3, direct current leakage protection circuit, this direct current leakage protection circuit comprises two inputs, two outputs and ground, two inputs are included as positive input terminal and negative input end, two outputs comprise positive output end and negative output terminal, the resistance R 1 of connecting between its positive input terminal and ground and one can controlled switch S 1, also the resistance R 2 of connecting between negative input end and ground and one can controlled switch S 2, two one of input series connection are connected with two outputs as passing instrument transformer after the double-pole switch of dropout switch, the secondary winding of instrument transformer is connected with double-pole switch by release, this device carrys out the closed and disconnected of control switch S1 and switch S 2 by control circuit, realize between positive-negative input end and ground and connecting and disconnection.For fear of occurring between positive-negative input end directly by two situations that resistance is connected, the present invention adopts the method for intersection break-make in the process that switch is controlled, when the switch S 1 between positive input terminal and ground is closed, switch S 2 between negative input end and ground disconnects, when the switch S 1 between positive input terminal and ground disconnects, switch S 2 closures between negative input end and ground.
When resistance R x+ and Rx-represent, in system, leaky occurs, positive-negative output end equivalent resistance over the ground.When ground connection occurs load anode, when resistance R x+ exists, leakage current flows into negative input end by positive output end, resistance R x+, resistance R 2; When ground connection occurs load negative terminal, when resistance R x-exists, leakage current flows into negative input end by positive input terminal, resistance R 1, resistance R x-.Because the resistance between positive-negative input end and ground is to convert with fixed frequency the state that connects and disconnect; so no matter there is ground connection in which utmost point of load end; leakage current by residual current circuit breaker is the alternating current of a fixed frequency all the time; whether direct current leakage protection circuit just can identify DC power-supply system and leak electricity, and realizes earth leakage protective function.
Claims (10)
1. be with earth leakage protective DC power-supply system, it is characterized in that, comprise for AC rectification being become to galvanic rectification module, standby galvanic batteries and direct current leakage protection circuit being provided;
The input of rectification module is used for connecing AC power, and positive and negative output connects respectively the positive and negative input of direct current leakage protection circuit and the positive and negative end of batteries; The positive and negative output of direct current leakage protection circuit is for connecing the positive and negative end of load, and the ground wire of direct current leakage protection circuit is for being connected with load housing;
Dropout operating mechanism, the first gate-controlled switch and at least one the first resistance, the second gate-controlled switch and at least one the second resistance that direct current leakage protection circuit comprises zero sequence current mutual inductor, triggered by zero sequence current mutual inductor secondary winding and for controlling the ON-OFF control circuit of the first gate-controlled switch and the second gate-controlled switch break-make; The release of dropout operating mechanism is connected with the secondary winding of zero sequence current mutual inductor, a windings in series of dropout switch and zero sequence current mutual inductor and together be connected between the positive and negative input and positive and negative output of device; The first gate-controlled switch and the first resistance are connected between positive bus-bar and ground wire, and the second gate-controlled switch and the second resistance are connected between negative busbar and ground wire.
2. be according to claim 1ly with earth leakage protective DC power-supply system, it is characterized in that, described rectification module comprises at least one rectification unit, and each rectification unit comprises main circuit, control circuit and auxiliary power circuit three parts; Main circuit, comprises lightning protection unit, EMC/EMI circuit, ac filter circuit, power conversion circuit, rectification circuit, DC-DC transfer circuit, DC filtering output circuit; Three-phase alternating current input, after lightning protection unit and EMC/EMI circuit, is carried out ac filter; And then rectification output after power conversion circuit; Output to DC-DC transfer circuit, required direct current is exported in last filtering; Control circuit, comprises input overvoltage/undervoltage protected location, current-limiting protection circuit, output overvoltage protection circuit, short-circuit protection circuit, voltage stabilizing loop, sample circuit, PFC unit, PMW control unit; PMW control unit is collected the signal of input overvoltage/undervoltage protected location, current-limiting protection circuit, output overvoltage protection circuit, short-circuit protection circuit, voltage stabilizing loop, is aggregated in power conversion circuit; Voltage stabilizing loop is Information Monitoring from sample circuit; The all Information Monitorings in the DC filtering output circuit from main circuit of sample circuit, short-circuit protection circuit, output overvoltage protection circuit, current-limiting protection circuit; In main circuit, the corresponding information of ac filter circuit is transported to respectively in input overvoltage/undervoltage protected location and PFC unit, and the information of simultaneously inputting in overvoltage/undervoltage protected location is also transported in PFC unit; Auxiliary power circuit is to provide necessary power supply for control circuit.
3. be according to claim 1ly with earth leakage protective DC power-supply system, it is characterized in that, described gate-controlled switch be in relay, triode, photoelectrical coupler any.
4. be according to claim 1ly with earth leakage protective DC power-supply system, it is characterized in that, described ON-OFF control circuit comprises two control signal outputs, connects respectively the control end of the first gate-controlled switch and the control end of the second gate-controlled switch.
5. be according to claim 1ly with earth leakage protective DC power-supply system, it is characterized in that two staggered break-makes of described gate-controlled switches.
6. be according to claim 1ly with earth leakage protective DC power-supply system, it is characterized in that two staggered break-makes of fixed frequency that described gate-controlled switch is pressed 50Hz.
7. be according to claim 1ly with earth leakage protective DC power-supply system; it is characterized in that; described ON-OFF control circuit comprises 555 timers; the square-wave signal that frequency is fixing of 3 pin outputs of 555 timers; the control end that divides two circuits to be connected respectively to two described gate-controlled switches, the reverser of wherein contacting in a circuit.
8. be according to claim 1ly with earth leakage protective DC power-supply system; it is characterized in that; described ON-OFF control circuit comprises microcontroller; described microcontroller produces two contrary square-wave signals of low and high level that frequency is fixing, outputs to respectively the control end of two gate-controlled switches through two output interfaces of controller.
9. be with earth leakage protective DC power-supply system, it is characterized in that, comprise for AC rectification being become to galvanic rectification module, standby galvanic batteries and direct current leakage protection circuit being provided;
The input of rectification module is used for connecing AC power, and positive and negative output connects respectively the positive and negative input of direct current leakage protection circuit and the positive and negative end of batteries; The positive and negative output of direct current leakage protection circuit is for connecing the positive and negative end of load, and the ground wire of direct current leakage protection circuit is for being connected with load housing;
Direct current leakage protection circuit comprises residual current circuit breaker, the first gate-controlled switch and at least one the first resistance, the second gate-controlled switch and at least one the second resistance and for controlling the ON-OFF control circuit of the first gate-controlled switch and the second gate-controlled switch break-make, inlet wire N end and the L end of described ac leakage circuit breaker connect respectively power end positive bus-bar and negative busbar, and outlet N end and L end connect respectively load end positive pole and negative pole; The first gate-controlled switch and the first resistance are connected between positive bus-bar and ground wire, and the second gate-controlled switch and the second resistance are connected between negative busbar and ground wire.
10. be according to claim 9ly with earth leakage protective DC power-supply system, it is characterized in that, described ON-OFF control circuit comprises two control signal outputs, connects respectively the control end of the first gate-controlled switch and the control end of the second gate-controlled switch.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410335398.4A CN104135061B (en) | 2014-07-15 | 2014-07-15 | The earth leakage protective DC power-supply system of a kind of band |
| CN201420389627.6U CN204068405U (en) | 2014-07-15 | 2014-07-15 | The earth leakage protective DC power-supply system of a kind of band |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410335398.4A CN104135061B (en) | 2014-07-15 | 2014-07-15 | The earth leakage protective DC power-supply system of a kind of band |
| CN201420389627.6U CN204068405U (en) | 2014-07-15 | 2014-07-15 | The earth leakage protective DC power-supply system of a kind of band |
Publications (2)
| Publication Number | Publication Date |
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| CN104135061A true CN104135061A (en) | 2014-11-05 |
| CN104135061B CN104135061B (en) | 2016-07-06 |
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| CN201420389627.6U Withdrawn - After Issue CN204068405U (en) | 2014-07-15 | 2014-07-15 | The earth leakage protective DC power-supply system of a kind of band |
| CN201410335398.4A Active CN104135061B (en) | 2014-07-15 | 2014-07-15 | The earth leakage protective DC power-supply system of a kind of band |
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| CN201420389627.6U Withdrawn - After Issue CN204068405U (en) | 2014-07-15 | 2014-07-15 | The earth leakage protective DC power-supply system of a kind of band |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106300446A (en) * | 2016-09-22 | 2017-01-04 | 深圳市诺华尼克电子有限公司 | The PFC direct current supply of a kind of intelligence and network integration system |
| CN108650730A (en) * | 2018-04-12 | 2018-10-12 | 上思县东岽电子科技有限责任公司 | A kind of LED illumination lamp driver of programmable light modulation |
| CN108834251A (en) * | 2018-04-12 | 2018-11-16 | 上思县东岽电子科技有限责任公司 | A kind of LED illumination lamp of programmable light modulation |
| CN108963972A (en) * | 2018-08-02 | 2018-12-07 | 杭州中恒电气股份有限公司 | A kind of AC creepage protection circuit with intelligent restoration function |
| WO2019033237A1 (en) * | 2017-08-14 | 2019-02-21 | 深圳市豪恩光电照明股份有限公司 | Electric leakage protection circuit, electric leakage protection apparatus and led apparatus |
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| CN204068405U (en) * | 2014-07-15 | 2014-12-31 | 沈亚斌 | The earth leakage protective DC power-supply system of a kind of band |
| CN110626172A (en) * | 2018-06-01 | 2019-12-31 | 车王电子股份有限公司 | Electric power system of electric bus |
| CN110167233A (en) * | 2019-06-10 | 2019-08-23 | 马化盛 | A kind of direct current supply distribution structure |
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| CN106300446A (en) * | 2016-09-22 | 2017-01-04 | 深圳市诺华尼克电子有限公司 | The PFC direct current supply of a kind of intelligence and network integration system |
| CN106300446B (en) * | 2016-09-22 | 2018-07-17 | 深圳市诺华尼克电子有限公司 | A kind of intelligence PFC direct current supplys and network integration system |
| WO2019033237A1 (en) * | 2017-08-14 | 2019-02-21 | 深圳市豪恩光电照明股份有限公司 | Electric leakage protection circuit, electric leakage protection apparatus and led apparatus |
| CN108650730A (en) * | 2018-04-12 | 2018-10-12 | 上思县东岽电子科技有限责任公司 | A kind of LED illumination lamp driver of programmable light modulation |
| CN108834251A (en) * | 2018-04-12 | 2018-11-16 | 上思县东岽电子科技有限责任公司 | A kind of LED illumination lamp of programmable light modulation |
| CN108963972A (en) * | 2018-08-02 | 2018-12-07 | 杭州中恒电气股份有限公司 | A kind of AC creepage protection circuit with intelligent restoration function |
| CN113176446A (en) * | 2021-04-30 | 2021-07-27 | 三一重机有限公司 | Working machine insulation detection method, device and system and working machine |
| CN113176446B (en) * | 2021-04-30 | 2023-08-11 | 三一重机有限公司 | Insulation detection method, device and system for working machine and working machine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN204068405U (en) | 2014-12-31 |
| CN104135061B (en) | 2016-07-06 |
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