CN202094810U - Current source power supply circuit for weak current system - Google Patents
Current source power supply circuit for weak current system Download PDFInfo
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- CN202094810U CN202094810U CN2011202174298U CN201120217429U CN202094810U CN 202094810 U CN202094810 U CN 202094810U CN 2011202174298 U CN2011202174298 U CN 2011202174298U CN 201120217429 U CN201120217429 U CN 201120217429U CN 202094810 U CN202094810 U CN 202094810U
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- current
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- power supply
- current transformer
- filter capacitor
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Abstract
The utility model relates to a current source power supply circuit for a weak current system. The power supply technology of an existing weak current system mainly employs a voltage source for the power supply. Primary sides of a plurality of current transformers are serially connected, one end of the first current transformer is connected with 220V mains supply, one end of the last current transformer is connected with one end of a current stabilizing inductor, the other end of the current stabilizing inductor is connected with the 220V mains supply, a pair of diodes in forward and reverse parallel connection is connected to the primary side of each current transformer so that overvoltage in an open circuit is prevented, and a secondary side of each current transformer consists of a rectifying bridge, a voltage stabilizing tube and a filter capacitor, wherein a cathode of each voltage stabilizing tube and an anode of each filter capacitor are connected with an output end of the corresponding rectifying bridge, and an anode of the voltage stabilizing tube and a cathode of the filter capacitor are connected with another output end of the corresponding rectifying bridge. The current source power supply circuit for the weak current system is simple in structure and stable in output.
Description
Technical field
The utility model relates to power supply power supply technique field, is specifically related to a kind of current source supply circuit that is used for weak electricity system.
Background technology
The power supply power supply technique of weak electricity system can provide the power supply of each load, and the power supply power supply technique of existing weak electricity system mainly adopts the voltage fed mode, and the kind of voltage source can be a general line voltage etc.Voltage source energy load mode is modal to be the power transformer mode, and the power transformer secondary side is forbidden short circuit, and when adopting the voltage fed secondary circuit short-circuit, the electric current of generation is very big, and the caloric value that causes is very big, can burn load or transformer itself.Voltage fed, poor anti jamming capability, the former limit of voltage transformer is the high pressure electricity consumption, the interference on former limit can be coupled to secondary in the ratio of transformer, causes the instability of power supply.Voltage source isolating power and on-load ability are conflicting, in order to strengthen isolating power, increase the thickness of insulating layer between the former secondary, and this can cause that leakage inductance increases, and causes voltage source on-load ability to weaken.
Summary of the invention
The purpose of this utility model provides the stable power power supply circuits, reduce to disturb, strengthens isolating power, avoids short circuit to cause damage to module.
For reaching above-mentioned purpose, the utility model comprises stabilizing inducatnce and a plurality of current transformer.
The former limit series connection of a plurality of current transformers, a termination civil power 220V of first current transformer in a plurality of current transformers of series connection, an end of last instrument transformer is connected with an end of stabilizing inducatnce, another termination civil power 220V of stabilizing inducatnce;
The former limit of each current transformer is connected with a pair of forward and reverse diode connected in parallel, prevents open-circuit over-voltage;
Each current transformer secondary is made up of rectifier bridge, voltage-stabiliser tube and filter capacitor; The negative pole of voltage-stabiliser tube is connected with an output of rectifier bridge, and the positive pole of voltage-stabiliser tube is connected with another output of rectifier bridge, and the positive pole of filter capacitor is connected with an output of rectifier bridge, and the negative pole of filter capacitor is connected with another output of rectifier bridge.
The utility model compared with prior art has the following advantages: adopt the stabilizing inducatnce of big inductance quantity anti-interference; The current source isolating power is strong, has very strong stability; Load short circuits does not have destructiveness to power supply itself, and is safe and reliable; The former limit series connection of a plurality of current transformers forms many group outputs.Forward and reverse parallel diode is placed on the former limit of each current transformer, can amplitude limit, prevent the overvoltage of opening a way and producing; Each is organized output unit and is independent of each other, one group of short circuit, and electric current directly flows through the clamp diode on former limit, can not damage the power supply load, does not also influence the normal power supply of other each groups.
Description of drawings
Fig. 1 is the utility model circuit diagram.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
With reference to Fig. 1, the utility model comprises employing stabilizing inducatnce 1, and current transformer 3 is isolated output, N current transformer 3 former limits series connection, and formation N organizes output unit and is respectively the weak electricity system power supply.Current transformer 3 secondary are by rectifier bridge 4, voltage-stabiliser tube 5, and filter capacitor 6 and load 7 are formed.Voltage-stabiliser tube 5 amplitude limits become voltage with current conversion, and rectifier bridge 5, filter capacitor 6 sizes are by load 7 decisions.Forward and reverse diode connected in parallel 2 is placed on each current transformer 3 former limit, prevents open-circuit over-voltage.Alternating voltage 8 produces stable electric current by the inductance 1 of big inductance quantity, and current transformer 3 becomes little electric current with big electric current isolated variable, little electric current is converted to direct current by rectifier bridge 4, direct current is converted to direct voltage by voltage-stabiliser tube 5, and through filter capacitor 6, supply load 7 uses.
1 pair of high order harmonic component of stabilizing inducatnce presents high induction reactance, has reduced the influence of high order harmonic component to load, and simultaneously because inductance has the inertia that electric current can not suddenly change, therefore for the disturbance of voltage, electric current changes not obvious, has steady flow result.
The secondary side current of current transformer 3 designs according to the load needs, and the former secondary no-load voltage ratio of instrument transformer depends on the quantity of power supply unit and the cost of manufacture of stabilizing inducatnce.No-load voltage ratio is big more, and the meaning primary current is big more, and the volt-ampere number of stabilizing inducatnce is big more, and cost increases, but original edge voltage reduces, the power supply unit that can connect more, and the on-load ability is stronger.No-load voltage ratio is more little, and the meaning primary current is more little, and the volt-ampere number of stabilizing inducatnce is more little, and cost reduces, but the rising of the voltage on former limit, the quantity of the power supply unit that can connect reduces, and the on-load ability weakens.
If select the current transformer 3 of 5A:0.1A for use, secondary current i1 is 0.1A, and the secondary supply power voltage is 5V, according to the principle that the former secondary volt-ampere of current transformer equates, primary current is 5A, and original edge voltage is 0.1V, if ten groups of series connection, voltage drop is 1V, does not influence the terminal voltage of stabilizing inducatnce.
As direct current i1 during greater than i2, the current i 3 that flows to voltage-stabiliser tube 5 for i1 than the big electric current that goes out of i2, normal power supply is given load 7; When direct current i1 equaled i2, i1 all stream gave i2, and normal power supply is given load 7; Too small when load, i2 is during greater than i1, and the size of current that flows to i2 still equals i1, and this moment, voltage-stabiliser tube 5 work were undesired, can not give load 7 by normal power supply, so during normal power supply, current i 2 should be smaller or equal to i1; When load 7 short circuits, i1 flows to voltage-stabiliser tube 5 entirely, and load 7 can not produce overcurrent because of short circuit.
Claims (1)
1. a current source supply circuit that is used for weak electricity system comprises stabilizing inducatnce and a plurality of current transformer, it is characterized in that:
The former limit series connection of a plurality of current transformers, a termination civil power 220V of first current transformer in a plurality of current transformers of series connection, an end of last instrument transformer is connected with an end of stabilizing inducatnce, another termination civil power 220V of stabilizing inducatnce;
The former limit of described current transformer is connected with a pair of forward and reverse diode connected in parallel, prevents open-circuit over-voltage;
Described current transformer secondary is made up of rectifier bridge, voltage-stabiliser tube and filter capacitor; The negative pole of voltage-stabiliser tube is connected with an output of rectifier bridge, and the positive pole of voltage-stabiliser tube is connected with another output of rectifier bridge, and the positive pole of filter capacitor is connected with an output of rectifier bridge, and the negative pole of filter capacitor is connected with another output of rectifier bridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202174298U CN202094810U (en) | 2011-06-24 | 2011-06-24 | Current source power supply circuit for weak current system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202174298U CN202094810U (en) | 2011-06-24 | 2011-06-24 | Current source power supply circuit for weak current system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202094810U true CN202094810U (en) | 2011-12-28 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202174298U Expired - Lifetime CN202094810U (en) | 2011-06-24 | 2011-06-24 | Current source power supply circuit for weak current system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202094810U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102223087A (en) * | 2011-06-24 | 2011-10-19 | 杭州四达电炉成套设备有限公司 | Current source power supply circuit for weak current system |
| CN104539168A (en) * | 2014-12-17 | 2015-04-22 | 杭州四达电炉成套设备有限公司 | Inductance current stabilization power supply circuit |
-
2011
- 2011-06-24 CN CN2011202174298U patent/CN202094810U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102223087A (en) * | 2011-06-24 | 2011-10-19 | 杭州四达电炉成套设备有限公司 | Current source power supply circuit for weak current system |
| CN104539168A (en) * | 2014-12-17 | 2015-04-22 | 杭州四达电炉成套设备有限公司 | Inductance current stabilization power supply circuit |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111228 |
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| CX01 | Expiry of patent term |