CN202373955U - Adjustable current limiting protective circuit in DC loop - Google Patents
Adjustable current limiting protective circuit in DC loop Download PDFInfo
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- CN202373955U CN202373955U CN2011205501855U CN201120550185U CN202373955U CN 202373955 U CN202373955 U CN 202373955U CN 2011205501855 U CN2011205501855 U CN 2011205501855U CN 201120550185 U CN201120550185 U CN 201120550185U CN 202373955 U CN202373955 U CN 202373955U
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Abstract
The utility model provides an adjustable current limiting protective circuit in a DC loop. The current limiting protective circuit comprises a signal processing circuit, a comparing control circuit both connected with a drive switching circuit; after acquired from the inlet and the outlet of the drive switching circuit, a circuit signal is processed by the signal processing circuit and then is output to the comparing control circuit; and a control signal is output to the drive switching circuit to control the switching on/off of the drive switching circuit after comparing the comparing control circuit and a standard signal. According to the utility model, conduction voltage drop at the two ends of an IGBT (Insulated Gate Bipolar Transistor) is sampled in real time, the current passing through a main circuit is indirectly monitored, and the IGBT is taken as a core, the circuit is compared and switched on/off in real time to achieve the protection to the circuit via directly detecting the over current of the circuit, the operation of the switching on/off is quick, no contact is generated; automatic recondition can be achieved, the control is automatic, the working efficiency is high; and the amplification coefficient of the circuit can be continuously regulated to achieve the regulation of a current limiting value.
Description
Technical field
The utility model relates to a kind of current-limiting protection circuit, adjustable current-limiting protection circuit on particularly a kind of DC loop.
Background technology
The overcurrent protection method of general high power DC power supply circuits has various ways: realize like blast breaking device and fast acting fuse; Use in addition on the circuit breaker (sky is opened) of heating effect of current, to the electric current responsive surge current protection device etc. that rises; Also have the power electronics safeties of the electric current in the electric current being monitored through series connection sampling resistor in circuit, or the like.These versions, protective capability is limited, and control device is relatively backward, has limited the scope of application.
The application of IGBT in the high power DC current supply circuit is quite extensive, and power controlling is high, and control device is convenient, but the peculiar transmission characteristic of IGBT itself is but demanded exploitation urgently in the application in current-limiting protection field.
Summary of the invention
To the deficiency of structure in the overcurrent protection in the prior art, the purpose of the utility model provides current-limiting protection circuit adjustable on a kind of DC loop, can realize that cut-off current is adjustable continuously, is beneficial to the shutoff of accurate, safe control circuit.
For realizing above-mentioned purpose; The technical scheme that the utility model adopts provides current-limiting protection circuit adjustable on a kind of DC loop; This current-limiting protection circuit is connected in the DC loop that needs protection, wherein: said current-limiting protection circuit includes signal processing circuit, the comparison control circuit that links to each other with the driving switch circuit; Circuit signal is after the entrance and exit acquired signal of driving switch circuit;, signal processing circuit exports to comparison control circuit after handling; Comparison control circuit and preset standard the signal relatively control signal of back output switching value are given the driving switch circuit, and the controlling and driving switching circuit turn-offs.
The effect of the utility model is that this current-limiting protection circuit passes through IGBT two ends conduction voltage drop through the row real-time sampling; Indirectly main circuit being flow through electric current carries out through the row monitoring; After sampled signal process two stages of treatment; Compare with reference voltage, when overcurrent, drive the IGBT shutoff, thereby play the purpose of current-limiting protection.It is adjustable that thereby signal amplifies continuous adjustable cut-off current, controlled, the static contactless no electric arc of power electronic device action, and control is reliable, recovers conveniently, and is adjustable to the adjustable continuous realization cut-off current of circuit amplification coefficient.
Description of drawings
Fig. 1 is a current-limiting protection circuit adjustable on the DC loop of the utility model.
Embodiment
Explain in conjunction with adjustable current-limiting protection circuit on accompanying drawing and the DC loop of embodiment the utility model.
As shown in Figure 1; The utility model DC loop on adjustable current-limiting protection circuit; This current-limiting protection circuit is connected in the DC loop that needs protection, and said current-limiting protection circuit includes signal processing circuit one, the comparison control circuit two that links to each other with driving switch circuit three; Circuit signal is after the entrance and exit acquired signal of driving switch circuit three;, signal processing circuit one exports to comparison control circuit two after handling; Comparison control circuit two and preset standard the signal relatively control signal of back output switching value are given driving switch circuit three, and controlling and driving switching circuit three turn-offs.
Said signal processing circuit one includes the appearance of operational amplifier A 1, operational amplifier A 2, operational amplifier A 3 and a potentiometer formation and uses amplifying circuit; Said potentiometer is parallel to inverting input and the output of two-level operating amplifier A3.
Said comparison control circuit two includes an interconnective reference voltage V ref and an operational amplifier A 4, and the in-phase input end of said operational amplifier A 4 links to each other through the output of a resistance with preset reference voltage Vref and operational amplifier A 4 respectively; The inverting input of operational amplifier A 4 links to each other with the output of signal processing circuit one through a resistance.
Said driving switch circuit three includes symmetrical power amplification circuit of interconnective complementation and IGBT; Be connected to the gate pole of IGBT through the symmetrical power amplification circuit of complementation from the signal of comparison control circuit two outputs; IGBT is connected in the DC loop that needs protection.The control signal of back output switching value is given driving switch circuit three, and controlling and driving switching circuit three turn-offs.
The utility model DC loop on the process that realizes of adjustable current-limiting protection circuit overcurrent protection function following:
Said signal processing circuit one consists predominantly of the appearance that operational amplifier A 1, operational amplifier A 2, operational amplifier A 3, potentiometer and voltage stabilizing didoe form and uses amplifying circuit; It is that the inverting input of operational amplifier A 1, operational amplifier A 2 links to each other through a resistance R 27 that said appearance amplifies with the one-level of amplifying circuit; Its in-phase input end links to each other with negative electrode with the anode of the Q1 of IGBT through same parameter resistance R 1, a parameter resistance R 2 respectively; Form pre-amplification circuit; Its output is connected in two inputs of operational amplifier A 3, signal is carried out secondary amplify, and said operational amplifier A 3 is operated in Voltage Series negative feedback state; Its feedback resistance is RP, and the signal output amplitude is adjustable.
Said comparison control circuit two includes an interconnective reference voltage V ref and an operational amplifier A 4, and the in-phase input end of said operational amplifier A 4 links to each other with its output with reference voltage V ref through a resistance respectively; The inverting input of said operational amplifier A 4 links to each other with the output of signal processing circuit one through a resistance.The amplifier A4 of this circuit is operated in the positive feedback state, compare the shutoff of comparative result driving switch circuit three with reference voltage V ref through signals collecting section processes signal.
Said driving switch circuit three includes symmetrical power amplification circuit of interconnective complementation and IGBT; Be connected to the gate pole of IGBT through the symmetrical power amplification circuit of complementation from the signal of comparison control circuit two outputs; IBGT is connected in the DC loop that needs protection.The complementary symmetrical power amplification circuit of Class B that the symmetrical power amplification circuit of said complementation is made up of with the dissimilar triode of technology same parameter isostructure.Said driving switch circuit three is connected in the major loop of the DC loop that needs protection, in order to conducting and shutoff major loop.
The A mouth that the anode of said IGBT is a main circuit with this current-limiting circuit current input terminal links to each other; The negative electrode of IGBT should be that the B mouth of main circuit links to each other with the current-limiting circuit current output terminal.The gate pole of IGBT links to each other with power driving circuit through a resistance R 3.
The complementary symmetrical power amplification circuit of said Class B is the simple power amplification drive circuit that a pair of NPN type and positive-negative-positive triode are formed; Be NPN triode T1 collector electrode with power supply VCC link to each other emitter with the generating utmost point of PNP triode T3 simultaneously the gate pole of the Q1 of the same IGBT through a resistance R 5 link to each other; The collector electrode of PNP triode T3 links to each other with power supply publicly; The base stage of triode T1 and triode T3 links to each other with operational amplifier A 4 outputs of comparison control circuit binary signal rating unit through a resistance after linking to each other jointly.
After control power supply VCC powers on; Operational amplifier A 4 outputs are through drawing effect output high level in the comparison control circuit two on the resistance R 9; The complementary symmetrical power amplification circuit of Class B gets into the saturation conduction state in the controlling and driving switching circuit three, and then drives the IGBT conducting; Direct current flows out through main circuit B mouth from negative electrode through the IGBT conductive channel from the anode of main circuit A mouth inflow IGBT, and IGBT is in normally open under the normal condition, forms the direct current passage.
When the electric current I AB that flows through in the main circuit circuit changes; The conduction voltage drop of IGBT changes thereupon; Thereby do comparison with this signals collecting and with reference signal, and drive the IGBT shutoff, can realize limiting the effect of flowing through size of current; Can this signal be adjusted magnification ratio, thereby can realize that cut-off current is adjustable.
Not only limitation of the utility model and above-mentioned specific embodiment, all in the principle and purport scope of the utility model, especially modification on the over-current signal acquisition mode or change should belong to the protection range of the utility model.
Claims (4)
1. adjustable current-limiting protection circuit on the DC loop; This current-limiting protection circuit is connected in the DC loop that needs protection, and it is characterized in that: said current-limiting protection circuit includes signal processing circuit (), the comparison control circuit (two) that links to each other with driving switch circuit (three); Circuit signal is after the entrance and exit acquired signal of driving switch circuit (three);, signal processing circuit () exports to comparison control circuit (two) after handling; Comparison control circuit (two) and preset standard the signal relatively control signal of back output switching value are given driving switch circuit (three), and controlling and driving switching circuit (three) turn-offs.
2. according to adjustable current-limiting protection circuit on the said DC loop of claim 1, it is characterized in that: said signal processing circuit () includes the appearance of operational amplifier A 1, operational amplifier A 2, operational amplifier A 3 and a potentiometer formation and uses amplifying circuit; Said potentiometer is parallel to inverting input and the output of two-level operating amplifier A3.
3. according to adjustable current-limiting protection circuit on the said DC loop of claim 1; It is characterized in that: said comparison control circuit (two) includes an interconnective reference voltage V ref and an operational amplifier A 4, and the in-phase input end of said operational amplifier A 4 links to each other through the output of a resistance with preset reference voltage Vref and operational amplifier A 4 respectively; The inverting input of operational amplifier A 4 links to each other with the output of signal processing circuit () through a resistance.
4. according to adjustable current-limiting protection circuit on the said DC loop of claim 1, it is characterized in that: said driving switch circuit (three) includes symmetrical power amplification circuit of interconnective complementation and IGBT; Be connected to the gate pole of IGBT through the symmetrical power amplification circuit of complementation from the signal of comparison control circuit (two) output; IGBT is connected in the DC loop that needs protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205501855U CN202373955U (en) | 2011-12-26 | 2011-12-26 | Adjustable current limiting protective circuit in DC loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205501855U CN202373955U (en) | 2011-12-26 | 2011-12-26 | Adjustable current limiting protective circuit in DC loop |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202373955U true CN202373955U (en) | 2012-08-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205501855U Expired - Fee Related CN202373955U (en) | 2011-12-26 | 2011-12-26 | Adjustable current limiting protective circuit in DC loop |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202373955U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412550A (en) * | 2011-12-26 | 2012-04-11 | 川铁电气（天津）集团有限公司 | Adjustable current-limiting protection circuit on direct current loop |
| CN106370429A (en) * | 2016-12-10 | 2017-02-01 | 哈尔滨东安汽车动力股份有限公司 | Novel engine loading tester for automobile engine testing platform |
-
2011
- 2011-12-26 CN CN2011205501855U patent/CN202373955U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412550A (en) * | 2011-12-26 | 2012-04-11 | 川铁电气（天津）集团有限公司 | Adjustable current-limiting protection circuit on direct current loop |
| CN106370429A (en) * | 2016-12-10 | 2017-02-01 | 哈尔滨东安汽车动力股份有限公司 | Novel engine loading tester for automobile engine testing platform |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120808 Termination date: 20171226 |