CN209462250U - A kind of protection circuit and protective device - Google Patents
A kind of protection circuit and protective device Download PDFInfo
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- CN209462250U CN209462250U CN201920240203.6U CN201920240203U CN209462250U CN 209462250 U CN209462250 U CN 209462250U CN 201920240203 U CN201920240203 U CN 201920240203U CN 209462250 U CN209462250 U CN 209462250U
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Abstract
The application is suitable for electronic technology field, provides a kind of protection circuit and protective device, and the protection circuit includes: and to export the division module of corresponding voltage division signal for receiving d. c. voltage signal；For d. c. voltage signal to be carried out to the energy-storage module of charging energy-storing；It is greater than the overcurrent protection module of predetermined threshold value voltage signal output first switch signal for receiving the discharge signal of energy-storage module output, and in discharge signal；First switch module for being controlled according to the first switch signal the voltage of the voltage division signal；And the second switch module for being switched over according to leakage pathway of the voltage division signal to discharge signal.It is switched over by the leakage pathway to discharge signal, so that the available timely absorption of surge current that energy-storage module is formed during charging and discharging, to the surge current for effectively inhibiting booting moment to be formed, avoids the component in back-end circuit and burnt since input current is excessive.
Description
Technical field
The embodiment of the present application belongs to electronic technology field, in particular to a kind of protection circuit and protective device.
Background technique
At present in technical field of electronic equipment, will be used wider and wider for voltage conversion circuit is general, and required
Power it is also increasing, with the increase of output power, the capacity of the capacitor in circuit also can be very big, in booting moment, electricity
When flowing to bulky capacitor charging, a very big surge current can be generated, can achieve dozens of Ann or peace electric current up to a hundred sometimes.
However, existing anti-surge circuit is designed generally directed to alternating current circuit, it not can be used directly and converted in DC voltage
In circuit, if DC voltage converting circuit lacks effective anti-surge circuit, the component that will lead to back-end circuit is burnt out.
Summary of the invention
The application's is designed to provide a kind of protection circuit and protective device, it is intended to solve existing anti-surge circuit
It designs, is not can be used directly in DC voltage converting circuit generally directed to alternating current circuit, if DC voltage converting circuit lacks
Effective anti-surge circuit will lead to the problem of component of back-end circuit is burnt out.
A kind of protection circuit provided by the present application, connect with DC voltage source and back-end circuit respectively, the protection electricity
Road includes:
It connect with the DC voltage source, for receiving the d. c. voltage signal of the DC voltage source output, and exports
The division module of corresponding voltage division signal；
It is connect respectively with the DC voltage source, the division module and the back-end circuit, it is described straight for receiving
Voltage signal is flowed, and the d. c. voltage signal is carried out to the energy-storage module of charging energy-storing；
It is connect respectively with the back-end circuit and the energy-storage module, for receiving the electric discharge of the energy-storage module output
Signal, and it is greater than the overcurrent protection module of predetermined threshold value voltage signal output first switch signal in the discharge signal；
It is connect respectively with the division module, the DC voltage source and the overcurrent protection module, for receiving
State voltage division signal, and the first switch module controlled according to the first switch signal the voltage of the voltage division signal；
And
It is connect respectively with the division module, the first switch module and the energy-storage module, it is described for receiving
Voltage division signal, and the second switch module switched over according to leakage pathway of the voltage division signal to the discharge signal.
Optionally, the protection circuit further include:
It is connect with the DC voltage source, for preventing the Voltage stabilizing module of the DC voltage source reversal connection.
Optionally, the protection circuit further include:
Connect with the DC voltage source, for the electric current in the d. c. voltage signal be more than predetermined current threshold when pair
The fusing module that the d. c. voltage signal is turned off.
Optionally, the division module includes: first resistor, second resistance, 3rd resistor and the first voltage-stabiliser tube；
The first end of the first end of the first resistor and the second resistance is connected to the first of the DC voltage source altogether
Output end, the second end of the first resistor, the second end of the second resistance, the first end of the 3rd resistor and described
The cathode of first voltage-stabiliser tube is connected to the first switch module altogether, and the of the anode of first voltage-stabiliser tube and the 3rd resistor
Two ends are connected to the second output terminal of the DC voltage source altogether.
Optionally, the energy-storage module includes: the 4th capacitor and the 5th capacitor；
The first end of 4th capacitor and the first end of the 5th capacitor are connected to the first of the DC voltage source altogether
Output end, the second end of the 4th capacitor and the second end of the 5th capacitor are connected to ground altogether.
Optionally, the overcurrent protection module includes: the second voltage-stabiliser tube and the 5th resistance；
The first end of 5th resistance is connect with the energy-storage module, the second end and described second of the 5th resistance
The cathode of voltage-stabiliser tube connects, and the anode of second voltage-stabiliser tube is connect with the first switch module.
Optionally, the first switch module includes: first switch tube, the second capacitor and the 4th resistance；
The current input terminal of the first switch tube is connect with the division module, the control terminal of the first switch tube,
The first end of second capacitor and the first end of the 4th resistance are connected to the overcurrent protection module altogether, and described first opens
Current output terminal, the second end of second capacitor and the second end of the 4th resistance for closing pipe are connected to the direct current altogether
Potential source.
Optionally, the second switch module includes: second switch, the 6th resistance and the 7th resistance；
The control terminal of the second switch is connect with the division module, the current output terminal of the second switch,
The first end of 6th resistance and the first end of the 7th resistance are connected to the DC voltage source, the second switch altogether
The second end of the current input terminal of pipe, the second end of the 6th resistance and the 7th resistance is connected to the energy storage mould altogether
Block.
Present invention also provides a kind of protective devices, comprising:
DC voltage source；
Back-end circuit；And
Protection circuit as described in any one of the above embodiments, the protection circuit respectively with the DC voltage source and it is described after
Terminal circuit connection.
The embodiment of the present application provides a kind of protection circuit and protective device, the protection circuit include: and the direct current
Voltage source connection for receiving the d. c. voltage signal of the DC voltage source output, and exports point of corresponding voltage division signal
Die block；It is connect respectively with the DC voltage source, the division module and the back-end circuit, for receiving the direct current
Voltage signal, and by the d. c. voltage signal carry out charging energy-storing energy-storage module；Respectively with the back-end circuit and institute
Energy-storage module connection is stated, is greater than default threshold for receiving the discharge signal of the energy-storage module output, and in the discharge signal
The overcurrent protection module of threshold voltage signal output first switch signal；Respectively with the division module, the DC voltage source with
And the overcurrent protection module connection, for receiving the voltage division signal, and according to the first switch signal to the partial pressure
The first switch module that the voltage of signal is controlled；And respectively with the division module, the first switch module and
The energy-storage module connection, for receiving the voltage division signal, and according to the voltage division signal to the aerial drainage of the discharge signal
The second switch module that path switches over.It is switched over by the leakage pathway to discharge signal, so that energy-storage module is filling
The available timely absorption of surge current formed during discharge of electricity, thus the surge electricity for effectively inhibiting booting moment to be formed
Stream, avoids the component in back-end circuit and burns since input current is excessive.
Detailed description of the invention
In order to more clearly explain the technical solutions in the embodiments of the present application, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is some embodiments of the present application, for ability
For the those of ordinary skill of domain, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is the structural schematic diagram for the protection circuit that one embodiment of the application provides；
Fig. 2 is the structural schematic diagram for the protection circuit that another embodiment of the application provides；
Fig. 3 is the structural schematic diagram for the protection circuit that another embodiment of the application provides；
Fig. 4 is the structural schematic diagram for the protection circuit that another embodiment of the application provides.
Specific embodiment
It is with reference to the accompanying drawings and embodiments, right in order to which the objects, technical solutions and advantages of the application are more clearly understood
The application is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the application, not
For limiting the application.
It should be noted that when component is referred to as " being fixed on " or " being set to " another component, it can directly or
It connects and is located on another component.When a component referred to as " is connected to " another component, it be can be directly or indirectly
It is connected on another component.Term " on ", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top",
The orientation or position of the instructions such as "bottom", "inner", "outside" are orientation based on the figure or position, are merely for convenience of describing,
It should not be understood as the limitation to the technical program.Term " first ", " second " are used merely to facilitate description purpose, and should not be understood as
Indication or suggestion relative importance or the quantity for implicitly indicating technical characteristic.The meaning of " plurality " is two or more,
Unless otherwise specifically defined.
In order to illustrate technical solution described herein, it is described in detail below in conjunction with specific accompanying drawings and embodiments.
Refering to fig. 1, the protection circuit in the present embodiment, connect with DC voltage source 10 and back-end circuit 20 respectively,
In, the protection circuit includes:
It is connect with the DC voltage source 10, for receiving the d. c. voltage signal of the DC voltage source output, and it is defeated
The division module 30 of corresponding voltage division signal out；
It is connect respectively with the DC voltage source 10, the division module 30 and the back-end circuit 20, for receiving
The d. c. voltage signal, and by the d. c. voltage signal carry out charging energy-storing energy-storage module 40；
It connect with the back-end circuit 20 and the energy-storage module 40, is exported for receiving the energy-storage module 40 respectively
Discharge signal, and the discharge signal be greater than predetermined threshold value voltage signal output first switch signal overcurrent protection module
50；
It connect, is used for the division module 30, the DC voltage source 10 and the overcurrent protection module 50 respectively
Receive the voltage division signal, and the first switch controlled according to the first switch signal the voltage of the voltage division signal
Module 60；And
It is connect respectively with the division module 30, the first switch module 60 and the energy-storage module 40, for connecing
Receive the voltage division signal, and the second switch mould switched over according to leakage pathway of the voltage division signal to the discharge signal
Block 70.
In the present embodiment, protection circuit setting of the DC voltage source 10 for providing d. c. voltage signal, in the application
Between DC voltage source 10 and back-end circuit 20, to carry out effective protection to back-end circuit 20.Work as DC voltage source
When 10 access moment, the d. c. voltage signal of output charges to energy-storage module 40, and energy-storage module 40 is equivalent to short-circuit condition at this time,
The electric current for the discharge signal that energy-storage module 40 exports is larger, and the discharge signal of the energy-storage module 40 output passes through second switch module
70 the first leakage pathway carries out releasing for electric current, which includes load, by the load to discharge signal
Energy is absorbed, thus effectively inhibit the surge current of discharge signal, specifically, the load can be biggish resistance,
Multiple biggish resistance formation in series or in parallel can be used.When entering normal work after the starting of back-end circuit 20, pass through
Division module 30 exports voltage division signal, switches to the discharge signal that energy-storage module 40 exports to control second switch module 70
Second leakage pathway of second switch module 70 carries out aerial drainage, which can be switch or the conducting of closure
Electronic switching tube.When circuit damage occurs in back-end circuit 20, at this point, the electric current for the discharge signal that energy-storage module 40 exports is gradually
Increase, when the discharge signal is greater than predetermined threshold value voltage signal, overcurrent protection module 50 can pass through output first switch letter
Number control first switch module 60 be grounded, at this time division module 30 export voltage division signal voltage be low level, to control
The leakage pathway of discharge signal is switched to the first leakage pathway by second switch module 70, so that negative in second switch module 70
It carries and consumption is realized to the energy of discharge signal, to realize overcurrent protection function.
In one embodiment, a kind of structural representation for protection circuit that Fig. 2 provides for another embodiment of the application
Figure, referring to fig. 2, the protection circuit further include: connect with the DC voltage source 10, for preventing the DC voltage source 10
The Voltage stabilizing module 80 of reversal connection.
In the present embodiment, it prevents DC voltage source 10 to be reversely connected by Voltage stabilizing module 80, avoids due to DC voltage source
10 positive and negative anodes reversal connection causes back-end circuit that the problem of component is burnt occurs.
In one embodiment, a kind of structural representation for protection circuit that Fig. 3 provides for another embodiment of the application
Figure, referring to Fig. 3, the protection circuit further include: connect with the DC voltage source 10, in the d. c. voltage signal
The fusing module 90 that electric current turns off the d. c. voltage signal when being more than predetermined current threshold.
In the present embodiment, fusing module 90 can directly fuse when the electric current flowed through is more than predetermined current threshold, from
And the d. c. voltage signal for avoiding DC voltage source 10 from exporting leads to due to high current the member in back-end circuit 20 in booting moment
There is a situation where burn for device.
Please further referring to fig. 4, the division module 30 include: first resistor R1, second resistance R2,3rd resistor R3 with
And the first voltage-stabiliser tube ZD1；
The first end of the first resistor R1 and the first end of the second resistance R2 are connected to the DC voltage source 10 altogether
The first output end, the second end of the first resistor R1, the second end of the second resistance R2, the 3rd resistor R3
The cathode of one end and the first voltage-stabiliser tube ZD1 are connected to the first switch module 60, the sun of the first voltage-stabiliser tube ZD1 altogether
The second end of pole and the 3rd resistor R3 are connected to the second output terminal of the DC voltage source 10 altogether.In the present embodiment,
Connect after one resistance R1 and second resistance R2 is in parallel with 3rd resistor R3, thus pass through first resistor R1, second resistance R2 and
3rd resistor R3 partial pressure, the effect of the first voltage-stabiliser tube ZD1 are to divide first resistor R1, second resistance R2 and 3rd resistor R3
The voltage exported afterwards is limited, so that the voltage for controlling the control terminal of second switch module 70 does not exceed its pressure voltage, it is right
Second switch module 70 is protected.
In one embodiment, the first end of division module 30 is connect with the first output end of DC voltage source 10, partial pressure
The second end of module 30 is connect with the second output terminal of DC voltage source 10, wherein the second output terminal of DC voltage source 10 connects
Ground.
In one embodiment, referring to fig. 4, the energy-storage module 40 includes: the 4th capacitor C4 and the 5th capacitor C5；It is described
The first end of 4th capacitor C4 and the first end of the 5th capacitor C5 are connected to the first output end of the DC voltage source 10 altogether,
The second end of the 4th capacitor C4 and the second end of the 5th capacitor C5 are connected to ground altogether.
In one embodiment, the 4th capacitor C4 and the 5th capacitor C5 can be big electrolytic capacitor, and protection circuit is receiving
After the d. c. voltage signal that DC voltage source 10 exports, charge to the 4th capacitor C4 and the 5th capacitor C5, in booting moment
Short-circuit condition is equivalent to when to capacitor charging, the discharge current of the 4th capacitor C4 and the 5th capacitor C5 is larger at this time.
In one embodiment, the first end of energy-storage module 40 is connect with the first output end of DC voltage source 10, energy storage
The second end of module 40 is grounded.
In one embodiment, referring to fig. 4, the overcurrent protection module 50 includes: the second voltage-stabiliser tube ZD2 and the 5th resistance
R5；The first end of the 5th resistance R5 is connect with the energy-storage module 40, the second end of the 5th resistance R5 and described the
The cathode of two voltage-stabiliser tube ZD2 connects, and the anode of the second voltage-stabiliser tube ZD2 is connect with the first switch module 60.
In the present embodiment, the second voltage-stabiliser tube ZD2 and the 5th resistance R5 is connected in series, when circuit damage occurs in back-end circuit 20
Bad when, at this point, the electric current for the discharge signal that energy-storage module 40 exports gradually increases, when the discharge signal is greater than predetermined threshold value voltage
When signal, the second voltage-stabiliser tube ZD2 is breakdown, and the discharge signal that energy-storage module 40 exports at this time reaches first switch module 60, and
The turn-on and turn-off of first switch module 60 are controlled.
In one embodiment, referring to fig. 4, the first switch module 60 includes: first switch tube Q1, the second capacitor C2
And the 4th resistance R4；The current input terminal of the first switch tube Q1 is connect with the division module 30, the first switch
The first end of the control terminal of pipe Q1, the first end of the second capacitor C2 and the 4th resistance R4 is connected to the overcurrent altogether and protects
Protect module 50, the current output terminal of the first switch tube Q1, the second end of the second capacitor C2 and the 4th resistance
The second end of R4 is connected to the DC voltage source 10 altogether.
In one embodiment, first switch tube Q1 can be NPN type triode, wherein the collector of NPN type triode
For the current input terminal of first switch tube Q1, the base stage of NPN type triode is the control terminal of first switch tube Q1, three pole of NPN type
The transmitting extremely current output terminal of first switch tube Q1 of pipe.
In one embodiment, referring to fig. 4, the second switch module 70 includes: second switch Q2, the 6th resistance R6
And the 7th resistance R7；
The control terminal of the second switch Q2 is connect with the division module 30, and the electric current of the second switch Q2 is defeated
The first end of outlet, the first end of the 6th resistance R6 and the 7th resistance R7 is connected to the DC voltage source 10 altogether,
The second end of the current input terminal of the second switch Q2, the second end of the 6th resistance R6 and the 7th resistance R7
It is connected to the energy-storage module 40 altogether.
In the present embodiment, the 6th resistance R6 and the 7th resistance R7 carries out in parallel to form second switch module 70
First leakage pathway, second switch Q2 can form the second leakage pathway of second switch module 70.
In one embodiment, second switch Q2 can be N-type metal-oxide-semiconductor, wherein the drain electrode of N-type metal-oxide-semiconductor is opened for second
The current input terminal of pipe Q2 is closed, the grid of N-type metal-oxide-semiconductor is the control terminal of second switch Q2, and the source electrode of N-type metal-oxide-semiconductor is second
The current output terminal of switching tube Q2.
In one embodiment, referring to fig. 4, the protection circuit in the present embodiment further include: respectively with first switch module
60 and division module 30 connect, the filter module 100 for being filtered to the voltage division signal.Wherein, mould is filtered
The first end of block 100 is connect with the voltage division signal output end of division module 30, the second end ground connection of filter module 100.
In one embodiment, referring to fig. 4, filter module 100 include first capacitor C1, the first end of first capacitor C1 with
The first end of filter module 100 connects, and the second end of first capacitor C1 is connect with the second end of filter module 100.
Present invention also provides a kind of protective devices, comprising:
DC voltage source 10；
Back-end circuit 20；And
Protection circuit as described in above-described embodiment, the protection circuit respectively with the DC voltage source 10 and described
Back-end circuit 20 connects.
In one embodiment, back-end circuit 20 can be the operating circuit in electrical appliance.
The embodiment of the present application provides a kind of protection circuit and protective device, the protection circuit include: and the direct current
Voltage source connection for receiving the d. c. voltage signal of the DC voltage source output, and exports point of corresponding voltage division signal
Die block；It is connect respectively with the DC voltage source, the division module and the back-end circuit, for receiving the direct current
Voltage signal, and by the d. c. voltage signal carry out charging energy-storing energy-storage module；Respectively with the back-end circuit and institute
Energy-storage module connection is stated, is greater than default threshold for receiving the discharge signal of the energy-storage module output, and in the discharge signal
The overcurrent protection module of threshold voltage signal output first switch signal；Respectively with the division module, the DC voltage source with
And the overcurrent protection module connection, for receiving the voltage division signal, and according to the first switch signal to the partial pressure
The first switch module that the voltage of signal is controlled；And respectively with the division module, the first switch module and
The energy-storage module connection, for receiving the voltage division signal, and according to the voltage division signal to the aerial drainage of the discharge signal
The second switch module that path switches over.It is switched over by the leakage pathway to discharge signal, so that energy-storage module is filling
The available timely absorption of surge current formed during discharge of electricity, thus the surge electricity for effectively inhibiting booting moment to be formed
Stream, avoids the component in back-end circuit and burns since input current is excessive.
The above is only the alternative embodiments of the application, not to limit the application, it is all in spirit herein and
Made any modifications, equivalent replacements, and improvements etc., should be included within the scope of protection of this application within principle.
Claims (10)
1. a kind of protection circuit, connect with DC voltage source and back-end circuit respectively, which is characterized in that the protection circuit packet
It includes:
It is connect with the DC voltage source, for receiving the d. c. voltage signal of the DC voltage source output, and exports correspondence
Voltage division signal division module；
It is connect respectively with the DC voltage source, the division module and the back-end circuit, for receiving the direct current
Signal is pressed, and the d. c. voltage signal is carried out to the energy-storage module of charging energy-storing；
It is connect respectively with the back-end circuit and the energy-storage module, for receiving the electric discharge letter of the energy-storage module output
Number, and it is greater than the overcurrent protection module of predetermined threshold value voltage signal output first switch signal in the discharge signal；
It is connect respectively with the division module, the DC voltage source and the overcurrent protection module, for receiving described point
Press signal, and the first switch module controlled according to the first switch signal the voltage of the voltage division signal；And
It is connect respectively with the division module, the first switch module and the energy-storage module, for receiving the partial pressure
Signal, and the second switch module switched over according to leakage pathway of the voltage division signal to the discharge signal.
2. protection circuit as described in claim 1, which is characterized in that the protection circuit further include:
It is connect with the DC voltage source, for preventing the Voltage stabilizing module of the DC voltage source reversal connection.
3. protection circuit as described in claim 1, which is characterized in that the protection circuit further include:
It is connect with the DC voltage source, to described when being more than predetermined current threshold for the electric current in the d. c. voltage signal
The fusing module that d. c. voltage signal is turned off.
4. protection circuit as described in claim 1, which is characterized in that the division module includes: first resistor, the second electricity
Resistance, 3rd resistor and the first voltage-stabiliser tube；
The first end of the first end of the first resistor and the second resistance is connected to the first output of the DC voltage source altogether
End, the second end of the first resistor, the second end of the second resistance, the first end of the 3rd resistor and described first
The cathode of voltage-stabiliser tube is connected to the first switch module, the anode of first voltage-stabiliser tube and the second end of the 3rd resistor altogether
It is connected to the second output terminal of the DC voltage source altogether.
5. protection circuit as described in claim 1, which is characterized in that the energy-storage module includes: the 4th capacitor and the 5th electricity
Hold；
The first end of 4th capacitor and the first end of the 5th capacitor are connected to the first output of the DC voltage source altogether
End, the second end of the 4th capacitor and the second end of the 5th capacitor are connected to ground altogether.
6. as described in claim 1 protection circuit, which is characterized in that the overcurrent protection module include: the second voltage-stabiliser tube and
5th resistance；
The first end of 5th resistance is connect with the energy-storage module, the second end and second pressure stabilizing of the 5th resistance
The cathode of pipe connects, and the anode of second voltage-stabiliser tube is connect with the first switch module.
7. protection circuit as described in claim 1, which is characterized in that the first switch module includes: first switch tube, the
Two capacitors and the 4th resistance；
The current input terminal of the first switch tube is connect with the division module, the control terminal of the first switch tube, described
The first end of second capacitor and the first end of the 4th resistance are connected to the overcurrent protection module, the first switch tube altogether
Current output terminal, the second end of second capacitor and the second end of the 4th resistance be connected to the DC voltage altogether
Source.
8. protection circuit as described in claim 1, which is characterized in that the second switch module includes: second switch, the
Six resistance and the 7th resistance；
The control terminal of the second switch is connect with the division module, the current output terminal of the second switch, described
The first end of 6th resistance and the first end of the 7th resistance are connected to the DC voltage source altogether, the second switch
The second end of current input terminal, the second end of the 6th resistance and the 7th resistance is connected to the energy-storage module altogether.
9. protection circuit as claimed in claim 2, which is characterized in that the Voltage stabilizing module includes the first voltage-stabiliser tube, and described the
The cathode of one voltage-stabiliser tube is connect with the first output end of the DC voltage source, the anode and the direct current of first voltage-stabiliser tube
The second output terminal of voltage source connects.
10. a kind of protective device characterized by comprising
DC voltage source；
Back-end circuit；And
Such as the described in any item protection circuits of claim 1-9, the protection circuit respectively with the DC voltage source and institute
State back-end circuit connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920240203.6U CN209462250U (en) | 2019-02-21 | 2019-02-21 | A kind of protection circuit and protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920240203.6U CN209462250U (en) | 2019-02-21 | 2019-02-21 | A kind of protection circuit and protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209462250U true CN209462250U (en) | 2019-10-01 |
Family
ID=68047010
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920240203.6U Active CN209462250U (en) | 2019-02-21 | 2019-02-21 | A kind of protection circuit and protective device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209462250U (en) |
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2019
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