CN207994608U - A kind of protection circuit of intermediate frequency power supply overcurrent - Google Patents
A kind of protection circuit of intermediate frequency power supply overcurrent Download PDFInfo
- Publication number
- CN207994608U CN207994608U CN201820015638.6U CN201820015638U CN207994608U CN 207994608 U CN207994608 U CN 207994608U CN 201820015638 U CN201820015638 U CN 201820015638U CN 207994608 U CN207994608 U CN 207994608U
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- resistance
- divider
- comparator
- power supply
- intermediate frequency
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Abstract
The utility model discloses a kind of protection circuits of intermediate frequency power supply overcurrent; current acquisition module, the first divider, the second divider, first comparator, the second comparator and the output unit being connect with intermediate frequency power supply including input terminal; the output end of current acquisition module is connect with the first divider and the second divider respectively; and first divider be connected in parallel with the second divider; the output end of first divider and the input terminal of first comparator connect, and the two is connected in series to form the first branch circuit；The output end of second divider is connect with the input terminal of the second comparator, and the two is connected in series to form the second branch circuit；The output end of first branch circuit and the second branch circuit is all connected to the input terminal of output unit, and the output end of output unit is connected to the intermediate frequency power supply；Protection circuit provided by the utility model can be timely, efficiently detects the electric current of intermediate frequency power supply overcurrent and takes safeguard measure in time by hardware, improves the security performance that intermediate frequency power supply uses.
Description
Technical field
The utility model is related to circuit design field more particularly to a kind of protection circuits of intermediate frequency power supply overcurrent.
Background technology
For intermediate frequency power supply by prolonged development, present application field is very extensive, as ship, aerospace, chemistry with
And medical industry etc..In following considerable time, intermediate frequency power supply will continue to play its considerable effect,
The safeguard measure that some safety are set is needed during using intermediate frequency power supply, and overcurrent protection generally is carried out to intermediate frequency power supply, and
The existing protection circuit for intermediate frequency power supply overcurrent generally uses software to carry out circuit control, i.e., is detected by detection circuit
It takes measures by software identifies, judges after over-current signal, but this mode can postpone the control time to circuit,
And then it may result in some unnecessary losses and occur.
Utility model content
The purpose of this utility model is that for the technical problems in the prior art, providing a kind of intermediate frequency power supply overcurrent
Protection circuit, specific technical solution is as follows：
A kind of protection circuit of intermediate frequency power supply overcurrent, including：Current acquisition module that input terminal is connect with intermediate frequency power supply,
One divider, the second divider, first comparator, the second comparator and output unit, the intermediate frequency power supply is for providing electricity
Flow the input power of signal and the first divider and the second divider, the output end of the current acquisition module is respectively with described the
One divider is connected with shown second divider, and first divider is connected in parallel with second divider, and described
The output end of one divider is connect with the input terminal of the first comparator, and the two is connected in series to form the first branch circuit；Institute
The output end for stating the second divider is connect with the input terminal of second comparator, and the two is connected in series to form the second branch electricity
Road；The output end of first branch circuit and second branch circuit is all connected to the input terminal of the output unit, institute
The output end for stating output unit is connected to the intermediate frequency power supply, wherein：
Current acquisition module, the current signal for acquiring the intermediate frequency power supply output, and the current signal is transmitted
To the first comparator and second comparator；
First divider carries out voltage division processing, by described for the first input voltage to first branch circuit
Processing is compared with the current signal in the first input voltage after the partial pressure by first comparator；
Second divider carries out voltage division processing, by described for the second input voltage to second branch circuit
Processing is compared with the current signal in the second input voltage after the partial pressure by the second comparator；
Output unit, for respond the first branch circuit with and the second branch circuit and current signal compare after as a result,
And feedback signal is sent to intermediate frequency power supply.
Further, first divider is provided with the first bleeder circuit, and first bleeder circuit includes resistance
R150, resistance R152, resistance R153 and capacitance C129, wherein the resistance R150 and resistance R152 is connected in parallel, and the two
There is one end with+15V voltages, the other end of resistance R150 connect with capacitance C129, the other end and resistance of resistance R152
The output end of R153 connections, the equal grounding connection of the other end of the resistance R153 and capacitance C129, and the first bleeder circuit connects
The electrode input end of first comparator.
Further, second divider is provided with the second bleeder circuit, and second bleeder circuit includes resistance
R151, resistance R154, resistance R155 and capacitance C130, wherein the resistance R151 and resistance R154 is connected in parallel, and the two
There is one end to be connect with -15V voltages, the other end of resistance R151 is connect with capacitance C130, the other end and the electricity of resistance R154
The output end for hindering R155 connections, the equal grounding connection of the other end of the resistance R155 and capacitance C130, and the second bleeder circuit connects
Connect the positive-negative input end of the second comparator.
Further, the chip that the first comparator and the second comparator use is LM239D, wherein described the
Pin 1, pin 6 and pin 7 are provided on one comparator, and the pin 6 connects first divider；Second comparator
On be provided with pin 2, pin 3, pin 4 and pin 5, and the pin 4 connects second divider, the pin 1 and pipe
The output end of foot 2 connects the output unit, 5 equal input signal IACOM of the pin 6 and the pin, and the pin 3 inputs
+ 15V voltages.
Further, the output unit includes an output circuit, and the output circuit includes resistance R157, resistance
R160, resistance R163, light emitting diode L36 and diode D12, wherein the input terminal connection described the of the diode D12
The output end of the output end of one comparator and second comparator, the light emitting diode L36 is connected to the defeated of diode D12
Enter end, the resistance R157 is connected between light emitting diode L36 and+15V power supplys, and the one end resistance R160 connects with diode D12
It connects, the one end resistance R163 grounding connection, the other end connect the output end of the output circuit with one end of resistance R160, described defeated
The output end for going out circuit connects the intermediate frequency power supply, for respond the first branch circuit with and the second branch circuit and current signal
It is after comparison as a result, and sending feedback signal to intermediate frequency power supply.
The utility model is acquired by installing current acquisition module in the output position of intermediate frequency power supply by current acquisition module
The current signal IACOM of intermediate frequency power supply is simultaneously transmitted in first comparator and the second comparator, and the is given respectively by intermediate frequency power supply
One branch circuit and the second branch circuit provide power input, and do voltage division processing by the first divider and the second divider,
Then by the collected current signal IACOM of power supply acquisition module respectively by first comparator and the second comparator with by the
Processing is compared in voltage after one divider and the second voltage divider, and output unit makes phase according to the result for comparing processing
Corresponding response, and send feedback information to intermediate frequency power supply, intermediate frequency power supply makes corresponding measure according to feedack, and existing
There is technology to compare, the protection circuit of intermediate frequency power supply overcurrent provided by the utility model has the following advantages：
1, can in time, effectively detect over-current signal and take corresponding measure to protect in time by the control of hardware circuit
Protection circuit.
2, circuit is simple and practical, and stability is good, reduces failure rate.
3, of low cost, easy to maintain, market is widely used.
Description of the drawings
Fig. 1 is the structure composition schematic diagram of the protection circuit of the utility model embodiment electric current of intermediate frequency overcurrent；
Fig. 2 is the actual circuit connection figure of divider, comparator and output unit in the utility model.
Description of the drawings：1- intermediate frequency power supplies, 2- current acquisition modules, the first divider of 3-, the second divider of 4-, 5- first compare
Compared with device, the second comparators of 6-, 7- output units.
Specific implementation mode
In order to make those skilled in the art more fully understand the utility model, below in conjunction with the utility model reality
The attached drawing in example is applied, the technical scheme in the utility model embodiment is clearly and completely described.Obviously, described
Embodiment is only that the utility model a part of the embodiment gives the utility model instead of all the embodiments in attached drawing
Preferred embodiment.The utility model can be realized in many different forms, however it is not limited to embodiment described herein,
It is made the understanding of the disclosure of the utility model more thorough and comprehensive on the contrary, purpose of providing these embodiments is.It is based on
The embodiments of the present invention, those of ordinary skill in the art are obtained all without creative efforts
Other embodiment shall fall within the protection scope of the present invention.
In conjunction with Fig. 1, in the utility model embodiment, the protection circuit of the intermediate frequency power supply overcurrent includes for providing electricity
The intermediate frequency power supply 1 in source, the current acquisition module 2 of the output current for acquiring intermediate frequency power supply, the first divider 3, second partial pressure
Device 4, first comparator 5, the second comparator 6 and output unit 7, wherein the intermediate frequency power supply 1 is for providing current signal and the
The output end of the input power of one divider 3 and the second divider 3, the current acquisition module 2 is divided with described first respectively
Device 3 and the connection of shown second divider 4, and first divider 3 is connected in parallel with second divider 4, current acquisition
The current signal for collecting intermediate frequency power supply 1 is transmitted to the first comparator 5 and second comparator 6 by module 2；Described
The output end of one divider 3 is connect with the input terminal of the first comparator 5, and the two is connected in series to form the first branch circuit,
First divider 3 is used to carry out voltage division processing to the first input voltage of first branch circuit, compares by described first
The first input voltage after the partial pressure processing is compared with current signal by device 5；The output end of second divider 4 with
The input terminal of second comparator 6 connects, and the two is connected in series to form the second branch circuit, and the second divider 4 is used for institute
The second input voltage for stating the second branch circuit carries out voltage division processing, by second comparator 6 by the after the partial pressure
Processing is compared with current signal for two input voltages；The output end of first branch circuit and second branch circuit is equal
It is connected to the input terminal of the output unit 7, the output end of the output unit 7 is connected to the intermediate frequency power supply 1, output unit
7 for respond the first branch circuit with and the second branch circuit and current signal compare after as a result, and sending feedback signal extremely
Intermediate frequency power supply 1.
In the utility model embodiment, what the current acquisition module 2 acquired is three-phase current, the first branch electricity
Road input is+15V voltages, and the input of the second branch circuit is -15V voltages.
In conjunction with Fig. 2, in the utility model embodiment, it is provided with the first bleeder circuit in the first divider 3, described first
Bleeder circuit includes resistance R150, resistance R152, resistance R153 and capacitance C129, wherein resistance R150 and resistance R152 is simultaneously
Connection connection, and both there is one end to be connect with+15V voltages, the other end of resistance R150 is connect with capacitance C129, resistance R152
The other end connect with resistance R153, the equal grounding connection of the other end of the resistance R153 and capacitance C129, and first partial pressure electricity
The electrode input end of the output end connection first comparator 5 on road.
In the utility model embodiment, the second bleeder circuit, second bleeder circuit are provided in the second divider 4
Including resistance R151, resistance R154, resistance R155 and capacitance C130, wherein the resistance R151 is in parallel with resistance R154 to be connected
It connects, and both there is one end to be connect with -15V voltages, the other end of resistance R151 is connect with capacitance C130, resistance R154's
The other end is connect with resistance R155, the equal grounding connection of the other end of the resistance R155 and capacitance C130, and the second bleeder circuit
Output end connect the second comparator 6 positive-negative input end.
In the utility model embodiment, the chip of the first comparator 5 and the use of the second comparator 6 is
LM239D, wherein pin 1, pin 6 and pin 7 are provided in the first comparator 5, and the pin 6 connects described first
Divider 3；Pin 2, pin 3, pin 4 and pin 5 are provided on second comparator 6, and the pin 4 connects described second
Divider 4, the pin 1 connect the output unit with the output end of pin 2, and the pin 6 and the pin 5 input letter
Number IACOM, 3 input+15V voltages of the pin.
In the utility model embodiment, the output unit 7 includes an output circuit, and the output circuit includes resistance
R157, resistance R160, resistance R163, light emitting diode L36 and diode D12, wherein the input terminal of the diode D12 connects
The output end of the first comparator 5 and second comparator 6 is connect, the output end of the light emitting diode L36 is connected to two
The input terminal of machine pipe D12, the resistance R157 are connected between light emitting diode L36 and+15V power supplys, the one end resistance R160 with
Diode D12 connections, the one end resistance R163 grounding connection, the other end connect the defeated of the output circuit with one end of resistance R160
The output end of outlet, the output circuit connects the intermediate frequency power supply 1, for responding the first branch circuit and and the second branch electricity
Road and current signal compare after as a result, and sending feedback signal to intermediate frequency power supply 1；It is described in the utility model embodiment
The input signal IACOM of the pin 5 of the pin 6 of current signal, that is, first comparator 5 and the second comparator 6.
In the utility model embodiment, because of the one end resistance R153 grounding connection, one end is connected to first comparator
Input terminal, so the input voltage size of first comparator 5 is resistance R153 both end voltages, it is assumed that be U1；Because of resistance R155
One end grounding connection, one end are connected to the input terminal of the second comparator 6, so the input voltage size of the second comparator 6 is electricity
Hinder R155 both end voltages, it is assumed that be U2, current signal IACOM by first comparator 5 and the second comparator 6 respectively with U1 and
U2 is compared, if the value of current signal IACOM between U1 and U2, the output current of intermediate frequency power supply 1 in default range,
First comparator 5 and the second comparator 6 send out high level signal, and light emitting diode L36 does not work, and intermediate frequency power supply 1 works normally；Such as
For the value of fruit current signal IACOM except U1 and U2 interval ranges, first comparator 5 and the second comparator 6 send out low level letter
Number, light emitting diode L36 is shinny.Output circuit output end exports low level signal to intermediate frequency power supply 1, and intermediate frequency power supply 1 is cut off
Or corresponding measure is carried out, ensure that intermediate frequency power supply 1 works in the current range of a safety.
The utility model in the output position of intermediate frequency power supply 1 by installing current acquisition module 2, by current acquisition module 2
It acquires the current signal IACOM of intermediate frequency power supply 1 and is transmitted in first comparator 5 and the second comparator 6, pass through intermediate frequency power supply 1
It gives the first branch circuit and the second branch circuit to provide power input respectively, and is done by the first divider 3 and the second divider 4
Then voltage division processing is compared 2 collected current signal IACOM of power supply acquisition module by first comparator 5 and second respectively
Be compared processing with the voltage after the first divider 3 and the second divider 4 partial pressure compared with device 6, output unit 7 according to than
Corresponding response is made to the result of processing, and sends feedback information to intermediate frequency power supply 1, intermediate frequency power supply 1 is according to the letter of feedback
Breath makes corresponding measure, compared with prior art, the protection circuit of intermediate frequency power supply overcurrent provided by the utility model have with
Lower advantage：
1, can in time, effectively detect over-current signal and take corresponding measure to protect in time by the control of hardware circuit
Protection circuit.
2, circuit is simple and practical, and stability is good, reduces failure rate.
3, of low cost, easy to maintain, market is widely used.
It these are only the embodiments of the present invention, be not intended to limit the scope of the claims of the utility model, although with reference to before
Embodiment is stated the utility model is described in detail, it, still can be right for those skilled in the art comes
Technical solution recorded in aforementioned each specific implementation mode is modified, or carries out equivalent replace to which part technical characteristic
It changes.Every equivalent structure done using the utility model specification and accompanying drawing content is directly or indirectly used in other correlations
Technical field, similarly within the utility model patent protection domain.
Claims (5)
1. a kind of protection circuit of intermediate frequency power supply overcurrent, which is characterized in that including：The electric current that input terminal is connect with intermediate frequency power supply is adopted
Collect module, the first divider, the second divider, first comparator, the second comparator and output unit, the intermediate frequency power supply is used
In the input power for providing current signal and the first divider and the second divider, the output end difference of the current acquisition module
It is connect with first divider and shown second divider, and first divider company in parallel with second divider
It connects, the output end of first divider is connect with the input terminal of the first comparator, and the two is connected in series to form first point
Branch circuit；The output end of second divider is connect with the input terminal of second comparator, and the two is connected in series to form
Two branch circuit；The output end of first branch circuit and second branch circuit is all connected to the defeated of the output unit
Entering end, the output end of the output unit is connected to the intermediate frequency power supply, wherein：
Current acquisition module, the current signal for acquiring the intermediate frequency power supply output, and the current signal is transmitted to institute
State first comparator and second comparator；
First divider carries out voltage division processing for the first input voltage to first branch circuit, passes through described first
Processing is compared with the current signal in the first input voltage after the partial pressure by comparator；
Second divider carries out voltage division processing for the second input voltage to second branch circuit, passes through described second
Processing is compared with the current signal in the second input voltage after the partial pressure by comparator；
Output unit, for respond the first branch circuit with and the second branch circuit compared with current signal after as a result, concurrent
Send feedback signal to intermediate frequency power supply.
2. the protection circuit of intermediate frequency power supply overcurrent according to claim 1, which is characterized in that the first divider setting
There is the first bleeder circuit, first bleeder circuit includes resistance R150, resistance R152, resistance R153 and capacitance C129,
In, the resistance R150 and resistance R152 is connected in parallel, and both have one end with+15V voltages, the other end of resistance R150
It is connect with capacitance C129, the other end of resistance R152 is connect with resistance R153, the other end of the resistance R153 and capacitance C129
Equal grounding connection, and the electrode input end of the output end connection first comparator of the first bleeder circuit.
3. the protection circuit of intermediate frequency power supply overcurrent according to claim 1, which is characterized in that the second divider setting
There is the second bleeder circuit, second bleeder circuit includes resistance R151, resistance R154, resistance R155 and capacitance C130,
In, the resistance R151 and resistance R154 is connected in parallel, and both has one end to be connect with -15V voltages, and resistance R151's is another
One end is connect with capacitance C130, and the other end of resistance R154 is connect with resistance R155, and the resistance R155 and capacitance C130's is another
The equal grounding connection in one end, and the output end of the second bleeder circuit connects the positive-negative input end of the second comparator.
4. the protection circuit of intermediate frequency power supply overcurrent according to claim 1, which is characterized in that the first comparator and
The chip that two comparators use is LM239D, wherein pin 1, pin 6 and pin 7 are provided in the first comparator, and
The pin 6 connects first divider；Pin 2, pin 3, pin 4 and pin 5 are provided on second comparator, and described
Pin 4 connects second divider, and the pin 1 connect the output unit, 6 He of the pin with the output end of pin 2
5 equal input signal IACOM of the pin, 3 input+15V voltages of the pin.
5. the protection circuit of intermediate frequency power supply overcurrent according to claim 1, which is characterized in that the output unit includes one
Output circuit, the output circuit include resistance R157, resistance R160, resistance R163, light emitting diode L36 and diode D12,
Wherein, the input terminal of the diode D12 connects the output end of the first comparator and second comparator, described to shine
The output end of diode L36 is connected to the input terminal of diode D12, the resistance R157 be connected to light emitting diode L36 with+
Between 15V power supplys, the one end resistance R160 is connect with diode D12, the one end resistance R163 grounding connection, the other end and resistance R160
One end connect the output end of the output circuit, the output end of the output circuit connects the intermediate frequency power supply, for responding
First branch circuit with and the second branch circuit and current signal compare after as a result, and sending feedback signal to intermediate frequency power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820015638.6U CN207994608U (en) | 2018-01-05 | 2018-01-05 | A kind of protection circuit of intermediate frequency power supply overcurrent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820015638.6U CN207994608U (en) | 2018-01-05 | 2018-01-05 | A kind of protection circuit of intermediate frequency power supply overcurrent |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207994608U true CN207994608U (en) | 2018-10-19 |
Family
ID=63818805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820015638.6U Expired - Fee Related CN207994608U (en) | 2018-01-05 | 2018-01-05 | A kind of protection circuit of intermediate frequency power supply overcurrent |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207994608U (en) |
-
2018
- 2018-01-05 CN CN201820015638.6U patent/CN207994608U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| 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: 20181019 Termination date: 20210105 |