CN102332711A - Protection circuit, and switching device and power distribution system using same - Google Patents
Protection circuit, and switching device and power distribution system using same Download PDFInfo
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- CN102332711A CN102332711A CN201110265316A CN201110265316A CN102332711A CN 102332711 A CN102332711 A CN 102332711A CN 201110265316 A CN201110265316 A CN 201110265316A CN 201110265316 A CN201110265316 A CN 201110265316A CN 102332711 A CN102332711 A CN 102332711A
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Abstract
The invention relates to a protection circuit operated in a solid-stage switch. The protection circuit is characterized by comprising a split-flow component connected to the output end of the solid-stage switch and a controllable switch; the split-flow component and the controllable switch are connected with each other; and the output end of the controllable switch is grounded. The protection circuit disclosed by the invention is operated in the solid-stage switch. When a load is in a working state, the controllable switch is disconnected. When the load is to be maintained or replaced, the solid-stage switch is disconnected at first; then the controllable switch is connected; the protection circuit is in a connection state; the split-flow component is used for discharging leakage current of the solid-stage switch to the ground; therefore, the protection circuit disclosed by the invention can be used for effectively preventing high voltage generated by the leakage current of the solid-stage switch from injuring people.
Description
[technical field]
The present invention relates to a kind of protective circuit, particularly a kind of protective circuit that applies to solid-state switch.
[background technology]
In the ac high-voltage place, solid-state switch (comprising IGBT, MOSFET etc.) is commonly used to substitute traditional electromagnetic relay and breaking protection circuit.When solid-state switch is in closed condition, can there be a leakage current, this leakage current can produce the high voltage that human body can be felt, therefore has a potential safety hazard.For example, in industrial power distribution system (IPDS), when the maintenance personal replaces load, can touch the lead-out terminal of the solid-state switch of closing, because the high pressure that the leakage current of solid-state switch produces, the maintenance personal has the sensation of electric shock.
In high-voltage applications, when solid-state switch with in light weight, the life-span is long, when encapsulating advantage replacement traditional electrical magnetic relay such as little, but there is potential safety hazard in the leakage current during the solid-state switch off state.In industrial control system, solid-state switch is used for power controlling load distribution, as giving power supplies such as electric light and amusement equipment.When a such equipment is under the maintenance mode, operating personnel may touch exposed lead, such as changing a bulb.Though the on off state of solid-state switch when maintenance mode closed, if leakage current has surpassed suitable rank, operating personnel just have the danger of electric shock.
[summary of the invention]
The technical problem that the present invention will solve provides a kind of protective circuit that applies to solid-state switch, and its high pressure that can prevent effectively that the leakage current of solid-state switch from producing damages personnel.
Above-mentioned technical problem solves through following technical scheme:
A kind of protective circuit that applies to solid-state switch is characterized in that, comprises that interconnective one is connected to the vent diverter and a gate-controlled switch of solid-state switch output, the output head grounding of gate-controlled switch.
Said vent diverter is a resistance element.
Visible by technique scheme, the present invention applies on the solid-state switch, and is in running order when load, breaks off gate-controlled switch; In the time will keeping in repair or replace load, break off earlier solid-state switch, the gate-controlled switch that closes then, this protective circuit is in on-state, and vent diverter is with the leakage current of the solid-state switch the earth of releasing; Therefore, the present invention can prevent effectively that the high pressure that the leakage current of solid-state switch produces from damaging personnel.
A kind of switching device; It is characterized in that, comprise the solid-state switch, a vent diverter and the gate-controlled switch that are linked in sequence, the output head grounding of gate-controlled switch; The input of said solid-state switch is as input terminal, and the output of said solid-state switch is as lead-out terminal.
Be provided with a fuse between said solid-state switch and the said vent diverter, the output of said fuse is as lead-out terminal.
The output of said solid-state switch is connected with a fuse, and the output of fuse is as lead-out terminal.
Said solid-state switch is IGBT.
Visible by technique scheme, this switching device combines solid-state switch with above-mentioned protective circuit, can prevent effectively that the high pressure of the leakage current generation of solid-state switch from damaging personnel.
A kind of power distribution system; It is characterized in that comprise that an interconnective power supply and is used to control the solid-state switch to the load distribution, the output of solid-state switch is connected with a vent diverter and a gate-controlled switch in proper order; The output head grounding of gate-controlled switch, the output of solid-state switch is as lead-out terminal.
Be provided with a fuse between said solid-state switch and the said vent diverter, the output of said fuse is as lead-out terminal.
The output of said solid-state switch is connected with a fuse, and the output of fuse is as lead-out terminal.
Visible by technique scheme, this power distribution system combines above-mentioned switching device, and power supply can be provided safely, can prevent effectively that the high pressure of the leakage current generation of solid-state switch from damaging personnel.
[description of drawings]
Fig. 1 is embodiment one structural representation of the present invention;
Fig. 2 is embodiment one a utilization sketch map of the present invention;
Fig. 3 is embodiment two structural representations of the present invention;
Fig. 4 is embodiment two utilization sketch mapes of the present invention;
Fig. 5 is embodiment three structural representations of the present invention;
Fig. 6 is embodiment three utilization sketch mapes of the present invention.
[embodiment]
Embodiment one
A kind of protective circuit that applies to solid-state switch as shown in Figure 1, that this enforcement provides comprises that specifically interconnective one is used to be connected to the vent diverter and a gate-controlled switch of solid-state switch output, the output head grounding of gate-controlled switch.Wherein, vent diverter is a resistance element.
As shown in Figure 2; This protective circuit is used to comprise the circuit of the power supply, solid-state switch, fuse and the load that connect successively; Specifically: the input that will shunt original paper connects the output of solid-state switch (certainly; The input of shunting original paper also can connect the output of fuse; This kind connects method and also belongs to " vent diverter is used to be connected to the solid-state switch output ", and vent diverter is to be connected indirectly with the solid-state switch output through a fuse), the output of gate-controlled switch directly ground connection or be connected to the parts that contact; In running order when load, this protective circuit is in off-state, and promptly controlled switch breaks off; In the time will keeping in repair or replace load, first open circuit, promptly solid-state switch breaks off, the gate-controlled switch that closes then, this protective circuit is in on-state, and vent diverter is with the earth of releasing of the drain voltage in the load, drain voltage vanishing volt.
Embodiment two
A kind of switching device as shown in Figure 3, that this enforcement provides specifically comprises the solid-state switch, a vent diverter and the gate-controlled switch that are linked in sequence, the output head grounding of gate-controlled switch; In order to make switching device safer, switching device also is provided with a fuse between solid-state switch and vent diverter, and the output of fuse is as lead-out terminal.
As shown in Figure 4, this switching device be used between power supply and the load specifically be, the input of solid-state switch connects the output of power supply, the output of fuse connects load, the output of gate-controlled switch directly ground connection perhaps be connected to the parts that contact; In running order when load, the solid-state switch of this switching device is in on-state, and the gate-controlled switch of this switching device is in off-state; In the time will keeping in repair or replace load, break off earlier the solid-state switch of this switching device, the gate-controlled switch that closes then, vent diverter is with the earth of releasing of the drain voltage in the load, drain voltage vanishing volt.
Embodiment three
As shown in Figure 5; A kind of power distribution system that this enforcement provides; Comprise that an interconnective power supply and is used to control the solid-state switch to the load distribution; The output of solid-state switch is connected with a fuse, a vent diverter and a gate-controlled switch in proper order, the output head grounding of gate-controlled switch, and the output of fuse is as lead-out terminal.
As shown in Figure 6, this power distribution system is used for power supply to load being provided, and specifically is, the output of the fuse of this power distribution system connects load; In running order when load, the solid-state switch of this power distribution system is in on-state, and gate-controlled switch is in off-state; In the time will keeping in repair or replace load, break off earlier solid-state switch, the gate-controlled switch that closes then, vent diverter is with the earth of releasing of the drain voltage in the load, drain voltage vanishing volt.
The present invention is not limited to the foregoing description, based on simple replacement the foregoing description, that do not make creative work, should belong to the scope that the present invention discloses.
Claims (9)
1. a protective circuit that applies to solid-state switch is characterized in that, comprises that interconnective one is connected to the vent diverter and a gate-controlled switch of solid-state switch output, the output head grounding of gate-controlled switch.
2. protective circuit according to claim 1 is characterized in that, said vent diverter is a resistance element.
3. switching device; It is characterized in that, comprise the solid-state switch, a vent diverter and the gate-controlled switch that are linked in sequence, the output head grounding of gate-controlled switch; The input of said solid-state switch is as input terminal, and the output of said solid-state switch is as lead-out terminal.
4. switching device according to claim 3 is characterized in that, is provided with a fuse between said solid-state switch and the said vent diverter, and the output of said fuse is as lead-out terminal.
5. switching device according to claim 3 is characterized in that the output of said solid-state switch is connected with a fuse, and the output of fuse is as lead-out terminal.
6. switching device according to claim 3 is characterized in that, said solid-state switch is IGBT.
7. power distribution system; It is characterized in that; Comprise that an interconnective power supply and is used to control the solid-state switch to the load distribution; The output of solid-state switch is connected with a vent diverter and a gate-controlled switch in proper order, the output head grounding of gate-controlled switch, and the output of solid-state switch is as lead-out terminal.
8. power distribution system according to claim 7 is characterized in that, is provided with a fuse between said solid-state switch and the said vent diverter, and the output of said fuse is as lead-out terminal.
9. power distribution system according to claim 7 is characterized in that the output of said solid-state switch is connected with a fuse, and the output of fuse is as lead-out terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110265316A CN102332711A (en) | 2011-09-07 | 2011-09-07 | Protection circuit, and switching device and power distribution system using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110265316A CN102332711A (en) | 2011-09-07 | 2011-09-07 | Protection circuit, and switching device and power distribution system using same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102332711A true CN102332711A (en) | 2012-01-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110265316A Pending CN102332711A (en) | 2011-09-07 | 2011-09-07 | Protection circuit, and switching device and power distribution system using same |
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| Country | Link |
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| CN (1) | CN102332711A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868595A (en) * | 2015-05-19 | 2015-08-26 | 北京控制工程研究所 | Power distribution system for physical simulation system of spacecraft |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080197699A1 (en) * | 2005-06-30 | 2008-08-21 | Honeywell International Inc. | Leakage current shunt in an electrical power distribution system utilizing solid state relays |
| CN202260427U (en) * | 2011-09-07 | 2012-05-30 | 北京欧比特控制工程研究院有限公司 | Protection circuit, switchgear using same, and power supply distribution system |
-
2011
- 2011-09-07 CN CN201110265316A patent/CN102332711A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080197699A1 (en) * | 2005-06-30 | 2008-08-21 | Honeywell International Inc. | Leakage current shunt in an electrical power distribution system utilizing solid state relays |
| CN202260427U (en) * | 2011-09-07 | 2012-05-30 | 北京欧比特控制工程研究院有限公司 | Protection circuit, switchgear using same, and power supply distribution system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868595A (en) * | 2015-05-19 | 2015-08-26 | 北京控制工程研究所 | Power distribution system for physical simulation system of spacecraft |
| CN104868595B (en) * | 2015-05-19 | 2017-03-22 | 北京控制工程研究所 | Power distribution system for physical simulation system of spacecraft |
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Application publication date: 20120125 |