CN109818341A - A kind of surge current suppression circuit - Google Patents
A kind of surge current suppression circuit Download PDFInfo
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- CN109818341A CN109818341A CN201910185857.8A CN201910185857A CN109818341A CN 109818341 A CN109818341 A CN 109818341A CN 201910185857 A CN201910185857 A CN 201910185857A CN 109818341 A CN109818341 A CN 109818341A
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- 239000004065 semiconductor Substances 0.000 claims description 35
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Abstract
The invention discloses a kind of surge current suppression circuits, comprising: pluggable terminal;DC-DC constant-current source, has input terminal, and input terminal has anode and cathode;AC-DC constant pressure source is electrically connected by pluggable terminal with DC-DC constant-current source;Electrolytic capacitor, electrolytic capacitor are in parallel with DC-DC constant-current source and AC-DC constant pressure source;Inrush current restraining module, the second end of Inrush current restraining module are electrically connected with the positive or negative pole of input terminal;The first end of Inrush current restraining module is electrically connected with the anode of electrolytic capacitor;Alternatively, the first end of Inrush current restraining module is electrically connected with the cathode of electrolytic capacitor;Wherein, Inrush current restraining module plugs electrical surge electric current caused by pluggable terminal, excessive electrical surge electric current is effectively avoided to cause to damage to the device inside power supply circuit for inhibiting in the case where AC-DC constant pressure source is powered.
Description
Technical field
The present invention relates to field of circuit technology more particularly to a kind of surge current suppression circuits.
Background technique
The power supply circuit of lamps and lanterns is made of AC-DC constant pressure source and DC-DC constant-current source two-stage, AC-DC constant pressure source and DC-
It is connected between DC constant-current source by pluggable terminal.Wherein, the input terminal of DC-DC constant-current source connects the electrolysis electricity of larger capacitance
Hold, to filter out DC-DC constant-current source internal switch device when switching work caused by ripple current.
It is between AC-DC constant pressure source and DC-DC constant-current source it is possible that hot-swappable in the installation and operating process of lamps and lanterns
Operation, i.e., AC-DC constant pressure source be powered in the case where, pluggable terminal is plugged, since the voltage on electrolytic capacitor cannot dash forward
Become, the input terminal of DC-DC constant-current source can be considered short-circuit condition.It can be considered that transient state is short when the output end of AC-DC constant pressure source is connected to
When the input terminal of the DC-DC constant-current source on road, it may appear that very big electrical surge electric current, excessive electrical surge electric current may be right
Device inside power supply circuit causes to damage.
Summary of the invention
The embodiment of the present invention provides a kind of surge current suppression circuit, can generate for solving existing power supply circuit
Very big electrical surge electric current, and excessive electrical surge electric current may cause to damage to the device inside power supply circuit
The problem of.
The embodiment of the present invention adopts the following technical solutions:
In a first aspect, the present invention provides a kind of surge current suppression circuits, comprising:
Pluggable terminal;
DC-DC constant-current source, has input terminal, and the input terminal has anode and cathode;
AC-DC constant pressure source is electrically connected by the pluggable terminal with the DC-DC constant-current source, the AC-DC constant pressure source
With output end, the anode of the output end is electrically connected with the positive of the input terminal, the cathode of the output end with it is described defeated
Enter the cathode electrical connection at end;
Electrolytic capacitor, the electrolytic capacitor are in parallel with the DC-DC constant-current source and the AC-DC constant pressure source;
Inrush current restraining module, the second end of the Inrush current restraining module and the positive or negative pole of the input terminal
Electrical connection;
If the second end of the Inrush current restraining module is electrically connected with the anode of the input terminal, the surge current
The first end of suppression module is electrically connected with the anode of the electrolytic capacitor;
If the second end of the Inrush current restraining module is electrically connected with the cathode of the input terminal, the surge current
The first end of suppression module is electrically connected with the cathode of the electrolytic capacitor;
Wherein, the Inrush current restraining module plugs institute in the case where the AC-DC constant pressure source is powered for inhibiting
State electrical surge electric current caused by pluggable terminal.
Further, the Inrush current restraining module includes:
First resistor, the second end of the first resistor are electrically connected with the positive or negative pole of the input terminal;
If the second end of the first resistor is electrically connected with the anode of the input terminal, the first end of the first resistor
It is electrically connected with the anode of the electrolytic capacitor;
If the second end of the first resistor is electrically connected with the cathode of the input terminal, the first end of the first resistor
It is electrically connected with the cathode of the electrolytic capacitor.
Further, the Inrush current restraining module includes:
Switching device, the first end of the switching device are electrically connected with the first end of the first resistor, the derailing switch
The second end of part is electrically connected with the second end of the first resistor;
Wherein, when the switching device is closed, the switching device is for the short circuit first resistor.
Further, the Inrush current restraining module includes:
Trigger device, the trigger device are electrically connected with the first resistor and the switching device respectively;
Wherein, the trigger device triggers the switching device based on the information of voltage of the first resistor and disconnects and close
It closes.
Further, the Inrush current restraining module includes: second resistance and 3rd resistor;
The switching device includes metal-oxide-semiconductor, and the source electrode of the metal-oxide-semiconductor is electrically connected with the first end of the first resistor, institute
The drain electrode for stating metal-oxide-semiconductor is electrically connected with the second end of the first resistor;
The trigger device includes triode, the first end of the emitter of the triode and the first resistor and described
The source electrode of metal-oxide-semiconductor is electrically connected, the second end and institute that the base stage of the triode passes through the second resistance and the first resistor
The drain electrode electrical connection of metal-oxide-semiconductor is stated, the collector of the triode is electrically connected with the grid of the metal-oxide-semiconductor, the triode
Collector be electrically connected by the 3rd resistor with the positive or negative pole of the input terminal.
Further, the Inrush current restraining module includes: the 4th resistance;
The emitter of the triode is electrically connected by the 4th resistance with the grid of the metal-oxide-semiconductor.
Further, if the pressure difference between the first end and second end of the first resistor is more than or equal to first predetermined value,
The then triode ON, the metal-oxide-semiconductor disconnect;
If the pressure difference between the first end and second end of the first resistor is less than the first predetermined value, three pole
Pipe disconnects, and the metal-oxide-semiconductor conducting, the first resistor is short-circuited.
Further, the range of the first predetermined value is 0.3V~0.9V.
Further, the first predetermined value is 0.6V.
Further, the triode is NPN triode, and the metal-oxide-semiconductor is N-channel field-effect tube.
At least one above-mentioned technical solution used in the embodiment of the present invention can reach it is following the utility model has the advantages that
Surge current suppression circuit provided in an embodiment of the present invention, by the way that Inrush current restraining module is arranged, by the surge
The second end of electric current suppression module is electrically connected with the positive or negative pole of the input terminal of DC-DC constant-current source;By the Inrush current restraining
The first end of module is electrically connected with the anode of electrolytic capacitor;Alternatively, the first end and electrolytic capacitor of Inrush current restraining module
Cathode electrical connection can inhibit to plug the electricity of electrical surge caused by pluggable terminal in the case where AC-DC constant pressure source is powered
Stream, effectively avoids excessive electrical surge electric current from causing to damage to the device inside power supply circuit.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes a part of the invention, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is a kind of structural schematic diagram of surge current suppression circuit provided in an embodiment of the present invention;
Fig. 2 is the structural schematic diagram of another surge current suppression circuit provided in an embodiment of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the specific embodiment of the invention and
Technical solution of the present invention is clearly and completely described in corresponding attached drawing.Obviously, described embodiment is only the present invention one
Section Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
Surge current suppression circuit provided in an embodiment of the present invention includes: pluggable terminal 1, and electrolytic capacitor C, DC-DC are permanent
Stream source 2, AC-DC constant pressure source 3 and Inrush current restraining module 4.Individually below to pluggable terminal 1, electrolytic capacitor C, DC-DC are permanent
Stream source 2, connection relationship and work relationship between AC-DC constant pressure source 3 and Inrush current restraining module 4 are illustrated, specifically such as
Under:
The DC-DC constant-current source 2 has input terminal, and input terminal has anode and cathode.The DC-DC constant-current source 2 is using existing
DC-DC constant-current source 2 in technology, the embodiment of the present invention is not specifically limited.Wherein, electrolytic capacitor C is for filtering out DC-DC perseverance
The ripple current that 2 internal switch device of stream source generates when working.
The AC-DC constant pressure source 3 is electrically connected by pluggable terminal 1 with DC-DC constant-current source 2, and AC-DC constant pressure source 3 has defeated
Outlet, the anode of output end are electrically connected with the anode of input terminal, and the cathode of output end is electrically connected with the cathode of input terminal.Wherein,
AC-DC constant pressure source 3 and pluggable terminal 1 are all made of AC-DC constant pressure source 3 and pluggable terminal 1 in the prior art, and the present invention is real
Example is applied to be not specifically limited.
Electrolytic capacitor C is in parallel with DC-DC constant-current source 2 and AC-DC constant pressure source 3, since the voltage on electrolytic capacitor C cannot dash forward
Become, so plugging pluggable terminal 1, the input terminal of the DC-DC constant-current source 2 is visual in the case where AC-DC constant pressure source 3 is powered
For short-circuit condition, then the output end of the AC-DC constant pressure source 3 is connected to the defeated of the DC-DC constant-current source 2 that can be considered short-circuit condition suddenly
Enter end, very big electrical surge electric current can be generated.And the second end of the Inrush current restraining module 4 and DC-DC constant-current source 2 is defeated
Enter the positive or negative pole electrical connection at end;If the second end of Inrush current restraining module 4 is electrically connected with the anode of input terminal, the wave
The first end for gushing electric current suppression module 4 is electrically connected with the anode of electrolytic capacitor C;If the second end of Inrush current restraining module 4 with
The cathode of input terminal is electrically connected, then the first end of the Inrush current restraining module 4 is electrically connected with the cathode of electrolytic capacitor C.Example
Property, as depicted in figs. 1 and 2, the second end of the Inrush current restraining module 4 is electrically connected with the cathode of input terminal, surge current
The first end of suppression module 4 is electrically connected with the cathode of electrolytic capacitor C, then connects wave by the input terminal in the DC-DC constant-current source 2
Electric current suppression module 4 is gushed, to inhibit to plug transient state caused by pluggable terminal 1 in the case where AC-DC constant pressure source 3 is powered
Surge current.
The Inrush current restraining module can be understood as the anode/cathode and capacitor C for the input terminal for being serially connected in DC constant-current source 2
Between one load, to avoid short-circuit condition.The Inrush current restraining module 4 can be load, such as resistance;The wave
Gushing electric current suppression module 4 can be the circuit containing load.Specific implementation of the embodiment of the present invention to the Inrush current restraining module 4
It is not specifically limited, as long as the realization circuit of the Inrush current restraining module 4 enables to the input terminal of the DC-DC constant-current source 2
It is not to be regarded as short-circuit condition.
Surge current suppression circuit provided in an embodiment of the present invention, by the way that Inrush current restraining module is arranged, by the surge
The second end of electric current suppression module is electrically connected with the positive or negative pole of the input terminal of DC-DC constant-current source;By the Inrush current restraining
The first end of module is electrically connected with the anode of electrolytic capacitor;Alternatively, the first end and electrolytic capacitor of Inrush current restraining module
Cathode electrical connection can inhibit to plug the electricity of electrical surge caused by pluggable terminal in the case where AC-DC constant pressure source is powered
Stream, effectively avoids excessive electrical surge electric current from causing to damage to the device inside power supply circuit.
Optionally, Inrush current restraining module described in above-described embodiment 4 may include: first resistor R1.First electricity
The second end of resistance R1 is electrically connected with the positive or negative pole of input terminal;If the second end of first resistor R1 and the anode of input terminal are electrically connected
It connects, then the first end of first resistor R1 is electrically connected with the anode of electrolytic capacitor C;If the second end of first resistor R1 and input terminal
Cathode electrical connection, then the first end of first resistor R1 is electrically connected with the cathode of electrolytic capacitor C.Illustratively, such as Fig. 1 and Fig. 2 institute
Show, the second end of first resistor R1 is electrically connected with the cathode of input terminal, the first end of first resistor R1 and bearing for electrolytic capacitor C
Pole electrical connection.Wherein, the resistance value satisfaction of the resistance enables to the input terminal of the DC-DC constant-current source 2 to be not to be regarded as short-circuit condition
Resistance value, therefore the embodiment of the present invention is not specifically limited.
The embodiment of the present invention is by using first resistor, by the positive or negative pole of the second end of first resistor and input terminal electricity
Connection, the first end of first resistor are electrically connected with the anode of electrolytic capacitor, alternatively, the first end of first resistor and electrolytic capacitor
Cathode electrical connection, it is possible to prevente effectively from the input terminal of the DC-DC constant-current source is considered as short-circuit condition, has the advantages of simple structure and easy realization.
Optionally, Inrush current restraining module described in above-described embodiment 4 may include: switching device.The derailing switch
The first end of part is electrically connected with the first end of first resistor R1, and the second end of switching device and the second end of first resistor R1 are electrically connected
It connects.Wherein, when switching device is closed, switching device is used for short-circuit first resistor R1.
The switching device can be manual switch;Certainly, which may be automatic switch, such as metal-oxide-semiconductor Q1.
The embodiment of the present invention is by using switching device, by the first end of the first end of the switching device and first resistor electricity
Connection, the second end of switching device are electrically connected with the second end of first resistor, can first resistor be short-circuited, effectively avoid
In DC-DC constant-current source and AC-DC constant pressure source under steady state operating conditions, there is current flowing to cause power loss in the first resistor
The phenomenon that occur.
Optionally, Inrush current restraining module described in above-described embodiment 4 may include: trigger device.The trigger
Part is electrically connected with first resistor R1 and switching device respectively.Wherein, trigger device is triggered based on the information of voltage of first resistor R1
Switching device disconnects and closure.
Illustratively, when it is implemented, when the trigger device knows that the voltage at the both ends first resistor R1 is more than or equal to threshold value
When voltage, trigger device is connected to cause switching device to disconnect;When the trigger device knows that the voltage at the both ends first resistor R1 is small
When threshold voltage, trigger device is disconnected to cause switching device to be closed, so that first resistor R1 is short-circuited.
The embodiment of the present invention, by the way that trigger device is arranged, can effectively control switch device be opened or closed, to control
Whether first resistor processed is short-circuited.Therefore, trigger device can flexibly control whether first resistor is short-circuited, so that first resistor
The phenomenon that can effectively avoiding the input terminal of the DC-DC constant-current source from being considered as short-circuit condition, and capable of effectively avoiding power loss
Occurring, structure is simple, and it is low in cost, securely and reliably.
Optionally, Inrush current restraining module described in above-described embodiment 4 may include: second resistance R2 and third electricity
Hinder R3.Switching device may include metal-oxide-semiconductor Q1, and the source electrode of metal-oxide-semiconductor Q1 is electrically connected with the first end of first resistor R1, metal-oxide-semiconductor Q1
Drain electrode be electrically connected with the second end of first resistor R1.Trigger device may include triode Q2, the emitter of triode Q2 with
The first end of first resistor R1 and the source electrode electrical connection of metal-oxide-semiconductor Q1, the base stage of triode Q2 pass through the electricity of second resistance R2 and first
The second end of R1 and the drain electrode electrical connection of metal-oxide-semiconductor Q1 are hindered, the collector of triode Q2 is electrically connected with the grid of metal-oxide-semiconductor Q1, three poles
The collector of pipe Q2 is electrically connected by 3rd resistor R3 with the positive or negative pole of input terminal.Illustratively, as shown in Fig. 2, three poles
The collector of pipe Q2 is electrically connected by 3rd resistor R3 with the anode of input terminal.Wherein, second resistance R2 and 3rd resistor R3
Resistance value can be chosen according to actual needs, and the embodiment of the present invention is not specifically limited.
4 specific work process of Inrush current restraining module are as follows: as shown in Fig. 2, if the first end of first resistor R1 and
Pressure difference between two ends is more than or equal to first predetermined value, then electrolytic capacitor C is also in charged state, the both ends electrolytic capacitor C
Voltage is smaller, and the input terminal of the DC-DC constant-current source 2 can be considered short-circuit condition, at this point, between the base stage and emitter of triode Q2
Voltage be more than or equal to first predetermined value, triode Q2 conducting, the gate voltage (electricity i.e. between grid and source electrode of metal-oxide-semiconductor Q1
Pressure) it is pulled low, metal-oxide-semiconductor Q1 is disconnected;If the pressure difference between the first end and second end of first resistor R1 is less than first predetermined value,
Electrolytic capacitor C is also in discharge condition, and the voltage at the both ends electrolytic capacitor C is larger, and the input terminal of the DC-DC constant-current source 2 can not
It is considered as short-circuit condition, at this point, the voltage between the base stage and emitter of triode Q2 is less than first predetermined value, triode Q2 is disconnected
It opens, the gate voltage (voltage i.e. between grid and source electrode) of metal-oxide-semiconductor Q1 is released as high level, metal-oxide-semiconductor Q1 conducting, the first electricity
Resistance R1 is short-circuited.Wherein, the range of first predetermined value is 0.3V~0.9V.Preferably, first predetermined value 0.6V.
Illustratively, triode can be NPN triode, and metal-oxide-semiconductor can be N-channel field-effect tube.
The embodiment of the present invention controls metal-oxide-semiconductor by the conducting and disconnection of triode by using triode and metal-oxide-semiconductor
Disconnection and conducting, be short-circuited or be not short-circuited to realize first resistor, structure is simple, low in cost, securely and reliably, tool
There is practicability, meanwhile, perfection realizes the inhibition of electrical surge electric current and does not introduce additional power loss.
Preferably, as shown in Fig. 2, Inrush current restraining module 4 described in above-described embodiment may include: the 4th resistance
R4.The emitter of triode Q2 is electrically connected by the 4th resistance R4 with the grid of metal-oxide-semiconductor Q1.Wherein, the resistance value of the 4th resistance R4
It can choose according to actual needs, the embodiment of the present invention is not specifically limited.The embodiment of the present invention passes through the 4th resistance R4 of setting,
The both ends of 4th resistance R4 are connect with the grid of metal-oxide-semiconductor Q1 and source electrode respectively, and the 4th resistance R4 and electrolytic capacitor C formation is put
Electrical circuit can be effectively prevented metal-oxide-semiconductor Q1 and mislead.
The technical staff in field is it should be appreciated that although preferred embodiments of the present invention have been described, but technology in the art
Personnel once know basic creative concept, then additional changes and modifications may be made to these embodiments.So appended power
Benefit requires to be intended to be construed to include preferred embodiment and all change and modification for falling into the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from model of the invention by those skilled in the art
It encloses.In this way, if these modifications and changes of the present invention is within the scope of the claims of the present invention and its equivalent technology, then
The present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of surge current suppression circuit characterized by comprising
Pluggable terminal;
DC-DC constant-current source, has input terminal, and the input terminal has anode and cathode;
AC-DC constant pressure source is electrically connected by the pluggable terminal with the DC-DC constant-current source, and the AC-DC constant pressure source has
Output end, the anode of the output end are electrically connected with the anode of the input terminal, the cathode of the output end and the input terminal
Cathode electrical connection;
Electrolytic capacitor, the electrolytic capacitor are in parallel with the DC-DC constant-current source and the AC-DC constant pressure source;
Inrush current restraining module, the second end of the Inrush current restraining module and the positive or negative pole of the input terminal are electrically connected
It connects;
If the second end of the Inrush current restraining module is electrically connected with the anode of the input terminal, the Inrush current restraining
The first end of module is electrically connected with the anode of the electrolytic capacitor;
If the second end of the Inrush current restraining module is electrically connected with the cathode of the input terminal, the Inrush current restraining
The first end of module is electrically connected with the cathode of the electrolytic capacitor;
Wherein, the Inrush current restraining module, can described in plug for inhibiting in the case where the AC-DC constant pressure source is powered
Electrical surge electric current caused by pluggable terminals.
2. surge current suppression circuit according to claim 1, which is characterized in that the Inrush current restraining module packet
It includes:
First resistor, the second end of the first resistor are electrically connected with the positive or negative pole of the input terminal;
If the second end of the first resistor is electrically connected with the anode of the input terminal, the first end of the first resistor and institute
State the anode electrical connection of electrolytic capacitor;
If the second end of the first resistor is electrically connected with the cathode of the input terminal, the first end of the first resistor and institute
State the cathode electrical connection of electrolytic capacitor.
3. surge current suppression circuit according to claim 2, which is characterized in that the Inrush current restraining module packet
It includes:
Switching device, the first end of the switching device are electrically connected with the first end of the first resistor, the switching device
Second end is electrically connected with the second end of the first resistor;
Wherein, when the switching device is closed, the switching device is for the short circuit first resistor.
4. surge current suppression circuit according to claim 3, which is characterized in that the Inrush current restraining module packet
It includes:
Trigger device, the trigger device are electrically connected with the first resistor and the switching device respectively;
Wherein, the trigger device triggers the switching device based on the information of voltage of the first resistor and disconnects and be closed.
5. surge current suppression circuit according to claim 4, which is characterized in that the Inrush current restraining module packet
It includes: second resistance and 3rd resistor;
The switching device includes metal-oxide-semiconductor, and the source electrode of the metal-oxide-semiconductor is electrically connected with the first end of the first resistor, the MOS
The drain electrode of pipe is electrically connected with the second end of the first resistor;
The trigger device includes triode, the first end and the MOS of the emitter of the triode and the first resistor
The source electrode of pipe is electrically connected, and the base stage of the triode passes through the second end of the second resistance and the first resistor and described
The drain electrode of metal-oxide-semiconductor is electrically connected, and the collector of the triode is electrically connected with the grid of the metal-oxide-semiconductor, the triode
Collector is electrically connected by the 3rd resistor with the positive or negative pole of the input terminal.
6. surge current suppression circuit according to claim 5, which is characterized in that the Inrush current restraining module packet
It includes: the 4th resistance;
The emitter of the triode is electrically connected by the 4th resistance with the grid of the metal-oxide-semiconductor.
7. surge current suppression circuit according to claim 5, which is characterized in that
If the pressure difference between the first end and second end of the first resistor is more than or equal to first predetermined value, the triode is led
Logical, the metal-oxide-semiconductor disconnects;
If the pressure difference between the first end and second end of the first resistor is less than the first predetermined value, the triode is disconnected
It opens, the metal-oxide-semiconductor conducting, the first resistor is short-circuited.
8. surge current suppression circuit according to claim 7, which is characterized in that the range of the first predetermined value is
0.3V~0.9V.
9. surge current suppression circuit according to claim 7, which is characterized in that the first predetermined value is 0.6V.
10. surge current suppression circuit according to claim 5, which is characterized in that the triode is NPN triode,
The metal-oxide-semiconductor is N-channel field-effect tube.
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CN102570785A (en) * | 2010-12-30 | 2012-07-11 | 中兴通讯股份有限公司 | Direct-current power supply hot plug slow starting control circuit and control method |
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CN203352856U (en) * | 2013-06-24 | 2013-12-18 | 合肥龙多电子科技有限公司 | Capacitor step-down LED lighting power supply with open circuit protection |
CN203339686U (en) * | 2013-07-23 | 2013-12-11 | 四川长虹欣锐科技有限公司 | Constant current source short circuit protection inhibition circuit |
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CN205490113U (en) * | 2016-01-07 | 2016-08-17 | 广东工业大学 | Novel last electric surge current suppression circuit |
CN205389171U (en) * | 2016-03-21 | 2016-07-20 | 河北佳讯飞扬科技发展有限公司 | AC -DC switching power supply surge current suppression circuit |
CN207251461U (en) * | 2017-08-31 | 2018-04-17 | 成都四威功率电子科技有限公司 | A kind of surge restraint circuit |
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