CN203352166U - Open circuit protection circuit of voltage reducing silicon chain - Google Patents
Open circuit protection circuit of voltage reducing silicon chain Download PDFInfo
- Publication number
- CN203352166U CN203352166U CN 201320242218 CN201320242218U CN203352166U CN 203352166 U CN203352166 U CN 203352166U CN 201320242218 CN201320242218 CN 201320242218 CN 201320242218 U CN201320242218 U CN 201320242218U CN 203352166 U CN203352166 U CN 203352166U
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- circuit
- silicon chain
- voltage
- optocoupler
- relay
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Abstract
The utility model discloses an open circuit protection circuit of a voltage reducing silicon chain. The protection circuit is provided with a silicon chain switching relay and a controlling circuit thereof, and the controlling circuit comprises a triode Q1. The open circuit protection circuit is characterized in that a silicon chain open circuit detection circuit is provided; a resistor R1, an input terminal of an optocoupler U1, and a voltage stabilizing tube DZ are connected in series and then are connected with an n gear silicon chain DTn and a contact of the silicon chain switching relay Jn in parallel, and the silicon chain open circuit detection circuit is formed. A relay input control and maintenance circuit is also provided; a power supply VCC is connected with an output terminal of the optocoupler U1 and a resistor R2 in series and is then connected to the ground, after the power supply VCC is connected with a controlled silicon SCR1, one circuit is connected with a node between the input terminal of the optocoupler U1 and the resistor R2, the other circuit is connected with a resistor R3 in series and is then connected with a base of the triode Q1, and the relay input control and maintenance circuit is formed. The open circuit protection circuit of the voltage reducing silicon chain is advantageous in that the circuit is simple, the original switching relay and the triode are used, and the original voltage regulating function is not affected.
Description
Technical field
The utility model relates to the silicon chain open loop protection circuit in a kind of industrial detection field.
Background technology
In the transforming plant DC power-supply system, closing bus bar voltage for the 220V power-supply system generally between DC242V～254V, for the 110V power-supply system generally between DC121V～127V.And control bus requirement rated voltage is the DC220V(220V system) or the DC110V(110V system).In order to meet the control bus voltage request, usually at closing bus bar, be connected in series a dropping equipment with controlling between mother.Dropping equipment generally adopts voltage dropping silicon chain.
Voltage dropping silicon chain is in series by the diode crimping of many sheets.In order to regulate control bus voltage, generally be divided into 5 grades of adjustings, regulate the 7V(220V system for every grade) or the 3.5V(110V system), as shown in Figure 1.
Control bus with the equipment requirement such as relay, protection be in operation, do not allow the control bus dead electricity.If voltage dropping silicon chain generation open fault, just directly cause the control bus dead electricity.
Summary of the invention
The utility model provides a kind of can produce the not circuit of dead electricity of relevant action protection DC control bus when open fault appears in voltage dropping silicon chain.
Technical solution of the present utility model is: a kind of voltage dropping silicon chain open loop protection circuit, be provided with the silicon chain and throw/cut relay and control circuit thereof, comprise triode Q1, be provided with in addition silicon chain open detection circuit, it is by after the input of resistance R 1, optocoupler U1, voltage-stabiliser tube DZ serial connection, with n shelves silicon chain DTn and silicon chain, to throw/cut the contact of relay J n in parallel; Also be provided with relay input control and holding circuit, it is output, the rear ground connection of resistance R 2 by power supply VCC serial connection optocoupler U1, after power supply VCC serial connection controllable silicon SCR 1, the output of one road and optocoupler U1 is connected with the node a between resistance R 2, after the series resistor R3 of another road, with the base stage of triode Q1, is connected.
Utility model has the following advantages:
1, circuit is simple;
2, use original throwing/cut relay and triode;
3, do not affect original voltage regulation function.
The accompanying drawing explanation
Fig. 1 is the voltage dropping silicon chain schematic diagram.
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
Further illustrate embodiment of the present utility model below in conjunction with accompanying drawing.
As shown in Figure 2, a kind of voltage dropping silicon chain open loop protection circuit, be provided with the silicon chain and throw/cut relay and control circuit thereof, comprise triode Q1, be provided with in addition silicon chain open detection circuit, it is by after the input of resistance R 1, optocoupler U1, voltage-stabiliser tube DZ serial connection, with n shelves silicon chain DTn and silicon chain, to throw/cut the contact of relay J n in parallel; Also be provided with relay input control and holding circuit, it is output, the rear ground connection of resistance R 2 by power supply VCC serial connection optocoupler U1, after power supply VCC serial connection controllable silicon SCR 1, the output of one road and optocoupler U1 is connected with the node a between resistance R 2, after the series resistor R3 of another road, with the base stage of triode Q1, is connected.
Following proposed numerical value is to take the 220V direct current system as example.
UH is input closing bus bar voltage; UK is output control bus voltage; The pressure drop of Un n shelves silicon chain.
1, when Q1 cut-off, relay J n are failure to actuate, n shelves silicon chain DTn drops into c point voltage=0.
2, the about 7V of Un left and right in the situation of normal operation.The voltage stabilizing value that can find out voltage-stabiliser tube in Fig. 2 is 10V, so the not conducting of input light-emitting diode of optocoupler U1, the efferent duct cut-off of U1, and the voltage of a point (on resistance R 2)=0, controllable silicon SCR 1 is turn-offed, and keeps the Q1 cut-off state.
If 3 silicon chain DTn open fault Un occurs and increase.When Un increases to the input light-emitting diode conducting that is enough to make optocoupler U1, the now efferent duct conducting of U1, the voltage ≈ VCC of a point (on resistance R 2), controllable silicon SCR 1 conducting that is triggered.B point voltage ≈ VCC, this voltage drives triode Q1 conducting by R3, and the relay J n action closing of contact is by silicon chain DTn shorted on both ends.Guaranteed not dead electricity of control bus.
4, Un=0 after silicon chain DTn is by short circuit, the input light-emitting diode cut-off of optocoupler U1, the voltage of a point (on resistance R 2)=0.According to the silicon controlled characteristics, only have a point voltage to be less than 0, that is to say that the voltage that a is ordered must be that negative value could be turn-offed controllable silicon SCR 1.And a point voltage value is that negative condition is non-existent in this circuit.So now controllable silicon SCR 1 keeps conducting state always.
Claims (1)
1. a voltage dropping silicon chain open loop protection circuit, be provided with the silicon chain and throw/cut relay and control circuit thereof, comprise triode Q1, it is characterized in that: be provided with silicon chain open detection circuit, it is by after the input of resistance R 1, optocoupler U1, voltage-stabiliser tube DZ serial connection, with n shelves silicon chain DTn and silicon chain, to throw/cut the contact of relay J n in parallel; Also be provided with relay input control and holding circuit, it is output, the rear ground connection of resistance R 2 by power supply VCC serial connection optocoupler U1, after power supply VCC serial connection controllable silicon SCR 1, the output of one road and optocoupler U1 is connected with the node a between resistance R 2, after the series resistor R3 of another road, with the base stage of triode Q1, is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320242218 CN203352166U (en) | 2013-05-07 | 2013-05-07 | Open circuit protection circuit of voltage reducing silicon chain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320242218 CN203352166U (en) | 2013-05-07 | 2013-05-07 | Open circuit protection circuit of voltage reducing silicon chain |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203352166U true CN203352166U (en) | 2013-12-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320242218 Expired - Lifetime CN203352166U (en) | 2013-05-07 | 2013-05-07 | Open circuit protection circuit of voltage reducing silicon chain |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203352166U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110492454A (en) * | 2019-09-26 | 2019-11-22 | 国家电网有限公司 | Silicon chain open-circuit-protection system in DC power system |
| CN110749821A (en) * | 2019-11-29 | 2020-02-04 | 国网江苏省电力有限公司太仓市供电分公司 | Silicon chain protection electronic switch detection method |
| CN110988575A (en) * | 2019-12-30 | 2020-04-10 | 国家电网有限公司 | Electric power terminal electric quantity acquisition warning system |
-
2013
- 2013-05-07 CN CN 201320242218 patent/CN203352166U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110492454A (en) * | 2019-09-26 | 2019-11-22 | 国家电网有限公司 | Silicon chain open-circuit-protection system in DC power system |
| CN110749821A (en) * | 2019-11-29 | 2020-02-04 | 国网江苏省电力有限公司太仓市供电分公司 | Silicon chain protection electronic switch detection method |
| CN110749821B (en) * | 2019-11-29 | 2022-01-04 | 国网江苏省电力有限公司太仓市供电分公司 | Silicon chain protection electronic switch detection method |
| CN110988575A (en) * | 2019-12-30 | 2020-04-10 | 国家电网有限公司 | Electric power terminal electric quantity acquisition warning system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131218 |