CN201278454Y - Novel current limiting device - Google Patents
Novel current limiting device Download PDFInfo
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- CN201278454Y CN201278454Y CNU2008201887436U CN200820188743U CN201278454Y CN 201278454 Y CN201278454 Y CN 201278454Y CN U2008201887436 U CNU2008201887436 U CN U2008201887436U CN 200820188743 U CN200820188743 U CN 200820188743U CN 201278454 Y CN201278454 Y CN 201278454Y
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Abstract
A novel current limiter comprises a rectification circuit, a reduction voltage power supply circuit, a current sensor, a control processing unit and an executive circuit, wherein the reduction voltage power supply circuit consists of a discharging loop, a pulsating trigger circuit, a switching tube, a voltage regulator circuit and a storage capacitor; the positive electrode of the output end of the rectification circuit is respectively connected with one end of the discharging loop, the input end of the pulsating trigger circuit and the collecting electrode of the switching tube; the output end of the pulsating trigger circuit is respectively connected with the base electrode of the switching tube and one end of the voltage regulator circuit; the emitting electrode of the switching tube is connected with the positive electrode of the storage capacitor to be used as a positive electrode for output; and the negative electrode of the output end of the rectification circuit is respectively connected with the other end of the discharging loop, the other end of the voltage regulator circuit and the negative electrode of the storage capacitor to be used as a negative electrode for output. The novel current limiter saves energy and is small in volume and stable and reliable for work, thereby being suitable for the special power supply environment with abrupt change of voltage.
Description
Technical field:
The utility model relates to a kind of novel current limiter.
Background technology:
In the past, in order to protect load, the fuse of generally connecting in the loaded work piece loop was as flow restricter, in case the loaded work piece loop current is excessive; fuse fuses automatically, and this mode is cumbersome, all needs to change fuse at every turn; dangerous, the control inaccuracy is used inconvenient.
Recent electric current present flow restricter, intelligent and precise control, easy to use, by sending comparison circuit to handle after the amplification of current sensor senses loaded work piece current in loop signal process amplifying circuit, as the work of the excessive drive controlling executive circuit of the current in loop of working, executive circuit cuts off the loaded work piece loop.But the relatively power consumption of these current limiters, and volume is big, job insecurity, and the life-span is short, burns out easily, be not suitable for the special power supply environment of voltage jump, and power supply voltage range is narrower.In addition, current sensor can only be finely tuned, therefore, can not the changeable environment for use of fine adaptation, limited the occasion of using, make the control precision in the work of whole current limiter be subjected to certain restriction.
Summary of the invention:
The purpose of this utility model provide a kind of energy-conservation, volume is little, stable and reliable operation, is fit to the New type of current flow restricter of the special power supply environment of voltage jump.
The technical solution of the utility model is achieved in that
A kind of novel current limiter, comprise rectification circuit, step-down power supply circuit, current sensor, controlled processing unit and executive circuit, change low-voltage DC output into by step-down power supply circuit after the rectification of alternating current input power supplying process rectification circuit, be controlled processing unit and executive circuit power supply, step-down power supply circuit is by discharge loop, the pulsation circuits for triggering, switching tube, voltage stabilizing circuit and storage capacitor are formed, the positive pole of the output of rectification circuit respectively with an end of discharge loop, the collector electrode of pulsation circuits for triggering input and switching tube is connected, the output of pulsation circuits for triggering is connected with the base stage of switching tube and an end of voltage stabilizing circuit respectively, the emitter of switching tube is connected with the positive pole of storage capacitor as the output of the positive pole of this step-down power supply circuit, the negative pole of output end of rectification circuit respectively with the other end of discharge loop, the other end of voltage stabilizing circuit is connected the negative pole output as this step-down power supply circuit with the negative pole of storage capacitor.
The utility model compared with prior art has following advantage: the power supply that 1) utilizes rectification circuit and step-down power supply circuit to form, be controlled processing unit and executive circuit power supply, because when step-down power supply circuit of the present utility model is unloaded, the consumed power of step-down power supply circuit equals the consumed power of the resistance of discharge loop, realize that unloaded input consumed power approaches zero design concept and the resistance of discharge loop is big, very energy-conservation; 2) in the step-down power supply circuit of the present utility model, in a single day the pulsed base electrode current appears in switching tube, the switching tube conducting is charged to storage capacitor, because switching tube is in half conducting state under this pattern of pincers pressure effect of voltage stabilizing circuit, this moment is because the sudden change of pulsating direct current input power source voltage, and the high-tension storage capacitor that occurs quickly charges to the voltage stabilizing value and turns to and end.Realization is suitable for the design concept of the special power supply environmental work of voltage jump, working stability, and the life-span is longer; 3) capacitance of the charging in the utility model step-down power supply circuit is smaller, and volume is little, and circuit is simple, dwindles 1/2 volume than traditional step-down power supply circuit.
Above-mentioned described voltage stabilizing circuit can be a voltage-stabiliser tube, and the base stage of voltage-stabiliser tube and switching tube and emitter form the clamper loop, to the voltage limit of storage capacitor.In a single day the pulsed base electrode current appears in switching tube, the switching tube conducting is charged to storage capacitor, because switching tube is in half conducting state under this pattern of pincers pressure effect of voltage-stabiliser tube, this moment is because the sudden change of pulsating direct current input power source voltage, and the high-tension storage capacitor that occurs quickly charges to the voltage stabilizing value and turns to and end.Realization is suitable for the design concept of the special power supply environmental work of voltage jump, and circuit structure is simple, and cost is low.
The input voltage value of above-mentioned described step-down power supply circuit is greater than the normal working voltage value of voltage-stabiliser tube with less than the withstand voltage of switching tube.For example: voltage-stabiliser tube is 15V, and switching tube is withstand voltage to be 450V, reliable direct-current input power supplying power supply voltage range 18V-400V, and output voltage is 14.3V, realizes the design concept of normal operation in the wide power supply voltage range.
Above-mentioned described pulsating direct current input can be to be provided through halfwave rectifier or full-wave rectification by civil power.
Above-mentioned described current sensor mainly is a trimmable resistance, this trimmable resistance is by plurality of sections resistance wire and short circuit loose piece, the short circuit loose piece is enclosed within slippage up and down on two sections resistance wires, can control the active length that is linked into resistance wire in the sample circuit by the position that changes the short circuit loose piece and realize the adjustable purpose of current sampling amount, the resistance adjustable range is big, regulate simply, the workplace that is fit to is more extensive.
Above-mentioned described plurality of sections resistance wire can be that a long resistance wire forms through suitable shaping, forms the stake body of U type, and the short circuit loose piece is enclosed within on the stake body of U type, and the plurality of sections resistance wire is meant more than 2 sections or 2 sections.
Above-mentioned described controlled processing unit mainly comprises amplifying circuit and comparison circuit, current sensor senses loaded work piece current in loop signal send comparison circuit to handle after amplifying through amplifying circuit, as the work of the excessive then drive controlling of loaded work piece current in loop executive circuit, executive circuit cuts off the loaded work piece loop.
Description of drawings:
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is a circuit block diagram of the present utility model;
Fig. 2 is the circuit block diagram of step-down power supply circuit correspondence of the present utility model;
Fig. 3 is the circuit diagram of Fig. 2 correspondence;
Fig. 4 is the circuit diagram of the utility model another part;
Fig. 5 is the structural representation of current sensor of the present utility model.
Embodiment:
As Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, the utility model comprises rectification circuit 1, step-down power supply circuit 2, current sensor 3, controlled processing unit 4 and executive circuit 5, change low-voltage DC output into by step-down power supply circuit 2 after 1 rectification of alternating current input power supplying process rectification circuit, be controlled processing unit 4 and executive circuit 5 power supplies, step-down power supply circuit 2 is by discharge loop 21, pulsation circuits for triggering 22, switching tube 23, voltage stabilizing circuit 24 and storage capacitor 25 are formed, the positive pole of the output of rectification circuit 1 respectively with an end of discharge loop 21, the collector electrode of pulsation circuits for triggering 22 inputs and switching tube 23 is connected, the output of pulsation circuits for triggering 22 is connected with the base stage of switching tube 23 and an end of voltage stabilizing circuit 24 respectively, the emitter of switching tube 23 is connected with the positive pole of storage capacitor 25 as the output of the positive pole of this step-down power supply circuit, the negative pole of output end of rectification circuit 1 respectively with the other end of discharge loop 21, the negative pole of the other end of voltage stabilizing circuit 24 and storage capacitor 25 is connected the negative pole output as this step-down power supply circuit.Voltage stabilizing circuit 24 can be voltage-stabiliser tube Z1, and the base stage of voltage-stabiliser tube Z1 and switching tube 23 and emitter form the clamper loop, to the voltage limit of storage capacitor 25.Rectification circuit 1 can be through halfwave rectifier or full-wave rectification by civil power.Controlled processing unit 4 mainly comprises amplifying circuit and comparison circuit, current sensor 3 detects and send comparison circuit to handle after loaded work piece current in loop signal amplifies through amplifying circuit, as excessive driving executive circuit 5 work of loaded work piece current in loop, executive circuit 5 cuts off the loaded work piece loop.The loaded work piece loop mainly is in series by load R0 and switch JK-1, and executive circuit 5 is made up of triode Q2, resistance R 4, diode D4 and relay J K, the break-make of the switch JK-1 in relay J K control load work loop.
The input voltage of step-down power supply circuit 2 is realized the design concept of normal operation in the wide power supply voltage range greater than the normal working voltage value of voltage-stabiliser tube Z1 with less than the withstand voltage of switching tube 23.For example: voltage-stabiliser tube 24 is 15V, and switching tube 23 is withstand voltage to be the reliable direct-current input power supplying power supply voltage range of 450V 18V-400V, and output voltage is 14.3V.
The operation principle of the utility model step-down power supply circuit is: the voltage of initial period storage capacitor C2 is zero, during the pulsating direct current input, power supply is in case the pulsed base electrode current of a switching tube short time of 23 base stages is given in energising by pulsation circuits for triggering 22, the size of the pulsed base electrode current of switching tube 23 and time, switching tube 23 pulsed base pole tensions were by the value decision of voltage-stabiliser tube 24 by the value decision of resistance R 2 in the pulsation circuits for triggering 22 and the resistance R 1 in capacitor C 1 and the discharge loop 21.In case the pulsed base electrode current occurs, switching tube 23 conductings are to storage capacitor 25 chargings, when storage capacitor 25 after several pulsating direct currents input charging, when storage capacitor 25 magnitudes of voltage equaled the difference of conduction voltage drop of the magnitude of voltage of voltage-stabiliser tube 24 and switching tube 23 base stages and emitter, switching tube 23 turned to and ends.This moment, the consumed power of step-down power supply circuit equaled the consumed power of resistance R 1 in the discharge loop 21 as the zero load of this step-down power supply circuit, and the resistance of resistance R 1 is bigger, realizes that unloaded input consumed power approaches zero design concept.More slow as the pulsating direct current input power source voltage rise time, by the 0V rising that begins to walk unhurriedly, according to the value decision by resistance R 2 in the pulsation circuits for triggering 22 and the resistance R 1 in capacitor C 1 and the discharge loop 21 of the size of the pulsed base electrode current of the principle switching tube 23 of the utility model circuit and time, the pulsed base pole tension is by the value decision of voltage-stabiliser tube 24.Switching tube 23 in a single day occur the pulsed base electrode current with regard to conducting to storage capacitor 25 charging, when the value that is charged to voltage-stabiliser tube 24 through dried approximately pulsating direct current input when storage capacitor 25 subtracted the conduction voltage drop of switching tube 23 base stages and emitter, switching tube 23 turned to and ends.Emptier as the pulsating direct current input power source voltage rise time, principle according to the utility model circuit, in a single day the pulsed base electrode current appears in switching tube 23, switching tube 23 conductings are to storage capacitor 25 chargings, because switching tube 23 is in half conducting state under this pattern of pincers pressure effect of voltage-stabiliser tube Z1, this moment is because the high-tension storage capacitor 25 that occurs of the sudden change of power source voltage is imported in pulsating direct current quickly charges to the voltage stabilizing value and turn to and end.Realization is suitable for the design concept of the special power supply environmental work of voltage jump.
Current sensor 3 mainly is adjustable resistance R3.As shown in Figure 5, resistance R 3 comprises plurality of sections resistance wire 31 and short circuit loose piece 32, short circuit loose piece 32 is enclosed within slippage up and down on two sections resistance wires 31, can control the active length that is linked into resistance wire 31 in the sample circuit by the position that changes short circuit loose piece 32 and realize the adjustable purpose of current sampling amount.Plurality of sections resistance wire 31 can be that a long resistance wire forms through suitable shaping, forms the stake body of U type, and short circuit loose piece 32 is enclosed within on the stake body of U type.Plurality of sections resistance wire 31 is meant more than two sections or two sections.Whole current sensor is simple in structure, and low cost of manufacture can be controlled the length that is linked into resistance wire 31 in the sample circuit by the position that changes short circuit loose piece 32 and realize the adjustable purpose of current sampling amount, realizes the purpose of deviation adjustment and compensation, and adjustable range is big.Thereby can simplify the structure of subsequent conditioning circuit for realizing the integrated advantageous conditions of having created of height of subsequent conditioning circuit, for the volume that reduces whole cost compressed products lays a solid foundation by the fixing gain amplifier of electron-amplifier.The utility model has also made full use of the various characteristics of resistance wire 31, has realized the function that deviation is adjusted with the simplest method.By being formed assembly, the combination of resistance wire 31 and short circuit loose piece 32 is installed in the application scenario easily.
Claims (8)
1, a kind of novel current limiter, comprise rectification circuit (1), step-down power supply circuit (2), current sensor (3), controlled processing unit (4) and executive circuit (5), change low-voltage DC output into by step-down power supply circuit (2) after the rectification of alternating current input power supplying process rectification circuit (1), be controlled processing unit (4) and executive circuit (5) power supply, it is characterized in that: step-down power supply circuit (2) is by discharge loop (21), pulsation circuits for triggering (22), switching tube (23), voltage stabilizing circuit (24) and storage capacitor (25) are formed, the positive pole of the output of rectification circuit (1) respectively with an end of discharge loop (21), the collector electrode of pulsation circuits for triggering (22) input and switching tube (23) is connected, the output of pulsation circuits for triggering (22) is connected with the base stage of switching tube (23) and an end of voltage stabilizing circuit (24) respectively, the emitter of switching tube (23) is connected with the positive pole of storage capacitor (25) as the output of the positive pole of this step-down power supply circuit, the negative pole of output end of rectification circuit (1) respectively with the other end of discharge loop (21), the negative pole of the other end of voltage stabilizing circuit (24) and storage capacitor (25) is connected the negative pole output as this step-down power supply circuit.
2, according to the described a kind of novel current limiter of claim 1, it is characterized in that: voltage stabilizing circuit (24) can be a voltage-stabiliser tube.
3, according to the described a kind of novel current limiter of claim 2, it is characterized in that: the base stage of voltage-stabiliser tube and switching tube (23) and emitter form the clamper loop, to the voltage limit of storage capacitor (25).
4, according to claim 1,2 or 3 described a kind of novel current limiters, it is characterized in that: rectification circuit (1) can be through halfwave rectifier or full-wave rectification by civil power.
5, according to the described a kind of novel current limiter of claim 4, it is characterized in that: current sensor (3) mainly is a trimmable resistance R1, this trimmable resistance R1 is by plurality of sections resistance wire (31) and short circuit loose piece (32), short circuit loose piece (32) is enclosed within slippage up and down on two sections resistance wires (31), can control the active length that is linked into resistance wire in the sample circuit (31) by the position that changes short circuit loose piece (32) and realize the adjustable purpose of current sampling amount.
6, according to the described a kind of novel current limiter of claim 3, it is characterized in that: the input voltage value of step-down power supply circuit (2) is greater than the normal working voltage value of voltage-stabiliser tube and less than the withstand voltage of switching tube (23).
7, according to the described a kind of novel current limiter of claim 5, it is characterized in that: plurality of sections resistance wire (31) can be that a long resistance wire forms through suitable shaping, form the stake body of U type, short circuit loose piece (32) is enclosed within on the stake body of U type, and plurality of sections resistance wire (31) is meant more than 2 sections or 2 sections.
8, according to the described a kind of novel current limiter of claim 1, it is characterized in that: controlled processing unit (4) mainly comprises amplifying circuit and comparison circuit, current sensor (3) detects and send comparison circuit to handle after loaded work piece current in loop signal amplifies through amplifying circuit, as the excessive drive controlling executive circuit of loaded work piece current in loop (5) work, executive circuit (5) cuts off the loaded work piece loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201887436U CN201278454Y (en) | 2008-08-11 | 2008-08-11 | Novel current limiting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201887436U CN201278454Y (en) | 2008-08-11 | 2008-08-11 | Novel current limiting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201278454Y true CN201278454Y (en) | 2009-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201887436U Expired - Lifetime CN201278454Y (en) | 2008-08-11 | 2008-08-11 | Novel current limiting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201278454Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018209604A1 (en) * | 2017-05-17 | 2018-11-22 | 深圳和而泰智能控制股份有限公司 | Drive circuit and electronic device |
| CN109782163A (en) * | 2018-12-28 | 2019-05-21 | 华中科技大学 | A kind of short-circuit detecting device and method for magnetic flux restricted type current limiting switch |
-
2008
- 2008-08-11 CN CNU2008201887436U patent/CN201278454Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018209604A1 (en) * | 2017-05-17 | 2018-11-22 | 深圳和而泰智能控制股份有限公司 | Drive circuit and electronic device |
| CN109782163A (en) * | 2018-12-28 | 2019-05-21 | 华中科技大学 | A kind of short-circuit detecting device and method for magnetic flux restricted type current limiting switch |
| CN109782163B (en) * | 2018-12-28 | 2020-12-08 | 华中科技大学 | Short circuit detection device and method for magnetic flux constraint type current limiting switch |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090722 |