CN207398813U - Current foldback circuit and electronic equipment - Google Patents
Current foldback circuit and electronic equipment Download PDFInfo
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- CN207398813U CN207398813U CN201721405621.3U CN201721405621U CN207398813U CN 207398813 U CN207398813 U CN 207398813U CN 201721405621 U CN201721405621 U CN 201721405621U CN 207398813 U CN207398813 U CN 207398813U
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Abstract
The utility model is related to electronic circuit technology fields, disclose a kind of current foldback circuit and electronic equipment, wherein, current foldback circuit includes circuit input end, first switch module, second switch module, current limliting module and circuit output end；The input terminal of the current limliting module and the input terminal of the second switch module are connected respectively with the circuit input end, first output terminal of the current limliting module is connected with the control terminal of the second switch module, and the second output terminal of the current limliting module is connected with the input terminal of the first switch module；The control terminal of the first switch module is connected to ground after being connected with the output terminal of the second switch module, and the output terminal of the first switch module is connected with the circuit output end.The utility model simplifies the structure of current foldback circuit and reduces cost.
Description
Technical field
The utility model is related to electronic circuit technology field, more particularly to a kind of current foldback circuit and electronic equipment.
Background technology
During the use of electronic equipment, if the reasons such as the circuit because short circuit of electronic equipment, aging cause electric current excessive,
It is easy to cause electronic equipment damage or even triggers security incident, therefore, it is necessary to carry out overcurrent protection to electronic equipment.At present,
Overcurrent protection is generally carried out to electronic equipment using integrated circuit (IC), still, the complicated and cost of this circuit is higher.
Utility model content
The purpose of this utility model is to provide a kind of current foldback circuit and electronic equipment, can simplify overcurrent protection electricity
The structure on road and reduce cost.
In order to solve the above-mentioned technical problem, the utility model provides a kind of current foldback circuit, including circuit input end, the
One switch module, second switch module, current limliting module and circuit output end；
The input terminal of the current limliting module and the input terminal of the second switch module connect respectively with the circuit input end
It connecing, the first output terminal of the current limliting module is connected with the control terminal of the second switch module, and the second of the current limliting module
Output terminal is connected with the input terminal of the first switch module；The control terminal of the first switch module and the second switch mould
It is connected to ground after the output terminal connection of block, the output terminal of the first switch module is connected with the circuit output end.
Current foldback circuit provided by the utility model, by the way that the first switch module is connected the circuit output
End, and pass through and the current limliting module is connected between the first switch module and the second switch module, so that institute
Current limliting module is stated by the first switch module by the current feedback of the circuit output end to the second switch module, from
And so that, when the load for being connected to the circuit output end works normally, the first switch module reaches cut-in voltage and leads
It is logical, so that the circuit output end is powered, while causes the second switch module to be not up to cut-in voltage and end, with
So that the first switch module reaches cut-in voltage and is held on, so that being connected to the load of the circuit output end
Keep normal work；When be connected to the electric current of load of the circuit output end it is excessive when, the current limliting module passes through described
One switch module is by the current feedback of the circuit output end to the second switch module, so that the second switch module
Reach cut-in voltage and turn on, so that the first switch module is not up to cut-in voltage and ends, hence circuit
Output terminal powers off, and so as to protect the load for being connected to the circuit output end, simplifies structure and the reduction of current foldback circuit
Cost.
Preferably, the current limliting module includes first resistor, second resistance and 3rd resistor；
The first end of the first resistor is connected with the input terminal of the current limliting module, the second end of the first resistor and
Second output terminal of the first end of the second resistance respectively with the current limliting module is connected, the second end of the second resistance with
First output terminal of the first end of the 3rd resistor respectively with the current limliting module is connected, the second end of the 3rd resistor with
Ground connects.By the first resistor, the second resistance and the 3rd resistor by the current feedback of the circuit output end
To the second switch module, the electric current of the load of the circuit output end is connected to monitoring, and controls the second switch
The on or off of module so as to which the first switch module be controlled to end or turned on, and then controls the circuit output end to break
Electricity is powered.
Preferably, the first switch module includes first switch pipe and the 4th resistance, the first switch pipe
Base stage be connected with the control terminal of the first switch module, the emitter of the first switch pipe and the first switch module
Input terminal connection, the collector of the first switch pipe is connected with the output terminal of the first switch module；Described first opens
The base stage for closing pipe is connected by the 4th resistance with the circuit input end.Since the first switch pipe reaches cut-in voltage
When conducting or not up to cut-in voltage when end, therefore the first switch pipe have on or off state, so as to
The circuit output end is controlled to be powered or power off.In addition, the 4th resistance provides bias current for the first switch pipe, with
Ensure that the first switch pipe can work normally.
Preferably, the first switch pipe is PNP type triode, and the base stage of the first switch pipe is positive-negative-positive
The base stage of triode, the emitter of the transmitting extremely PNP type triode of the first switch pipe, the current collection of the first switch pipe
The extremely collector of PNP type triode.When reaching cut-in voltage due to PNP type triode conducting or not up to cut-in voltage when
Cut-off, therefore there is on or off state using the first switch pipe of PNP type triode, so as to control the electricity
Road output terminal power-off is powered.
Preferably, the first switch module includes second switch pipe；
The grid of the second switch pipe is connected with the control terminal of the first switch module, the source of the second switch pipe
Pole is connected with the input terminal of the first switch module, the drain electrode of the second switch pipe and the output of the first switch module
End connection.When reaching cut-in voltage due to the second switch pipe conducting or not up to cut-in voltage when end, can
The circuit output end is controlled to power off or be powered.
Preferably, the second switch pipe is P-channel metal-oxide-semiconductor, and the grid of the second switch pipe is P-channel
The grid of metal-oxide-semiconductor, the source electrode of the second switch pipe are the source electrode of P-channel metal-oxide-semiconductor, and the drain electrode of the second switch pipe is P ditches
The drain electrode of road metal-oxide-semiconductor.When reaching cut-in voltage due to P-channel metal-oxide-semiconductor conducting or not up to cut-in voltage when end, adopt
There is on or off state with the second switch pipe of P-channel metal-oxide-semiconductor, so as to which the circuit output end is controlled to be powered
Or power-off.
Preferably, the second switch module includes the 3rd switching tube, the base stage of the 3rd switching tube and institute
The control terminal connection of second switch module is stated, the emitter of the 3rd switching tube connects with the input terminal of the second switch module
It connects, the collector of the 3rd switching tube is connected with the output terminal of the second switch module.Since the 3rd switching tube reaches
To during cut-in voltage conducting or not up to cut-in voltage when end, therefore the 3rd switching tube have on or off shape
State so as to which the first switch module is controlled to end or is turned on, and then controls the circuit output end power-off or is powered.
Preferably, the 3rd switching tube is PNP type triode, and the base stage of the 3rd switching tube is positive-negative-positive
The base stage of triode, the emitter of the transmitting extremely PNP type triode of the 3rd switching tube, the current collection of the 3rd switching tube
The extremely collector of PNP type triode.When reaching cut-in voltage due to PNP type triode conducting or not up to cut-in voltage when
Cut-off, therefore there is on or off state using the 3rd switching tube of PNP type triode, so as to control described the
One switch module ends or conducting, and then controls the circuit output end power-off or be powered.
Preferably, the current foldback circuit further includes the 5th resistance, the output terminal of the second switch module
It is connected to ground by the 5th resistance.5th resistance plays metering function, to protect the second switch module, so as to carry
The stability of high second switch module, and then improve the stability of the current foldback circuit.
In order to solve the above-mentioned technical problem, the utility model also provides a kind of electronic equipment, is protected including any of the above-described overcurrent
Protection circuit.
Electronic equipment provided by the utility model, by the way that the first switch module is connected the circuit output end, and
By the way that the current limliting module is connected between the first switch module and the second switch module, so that the current limliting
Module by the first switch module by the current feedback of the circuit output end to the second switch module so that
When the load for being connected to the circuit output end works normally, the first switch module reaches cut-in voltage and turns on, into
And so that the circuit output end is powered, while so that the second switch module is not up to cut-in voltage and ends, so that
The first switch module reaches cut-in voltage and is held on, so that the load for being connected to the circuit output end is kept
Normal work；When be connected to the electric current of load of the circuit output end it is excessive when, the current limliting module is opened by described first
Module is closed by the current feedback of the circuit output end to the second switch module, so that the second switch module reaches
Cut-in voltage and turn on so that the first switch module is not up to cut-in voltage and ends, hence circuit output
End power-off, so as to protecting the load for being connected to the circuit output end, simplifying the structure of current foldback circuit and reducing cost.
Description of the drawings
Fig. 1 is the circuit block diagram in the utility model embodiment；
Fig. 2 is the circuit diagram in the utility model embodiment；
Fig. 3 is the circuit diagram of the another embodiment in the utility model embodiment.
Specific embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
It clearly and completely describes, it is clear that the described embodiments are only a part of the embodiments of the utility model rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are without creative efforts
All other embodiments obtained shall fall within the protection scope of the present invention.
As shown in Figure 1, a kind of current foldback circuit of the preferred embodiment in the utility model, including circuit input end VIN,
One switch module 201, second switch module 202, current limliting module 203 and circuit output end VOUT；
The input terminal of the current limliting module 203 and the input terminal of the second switch module 202 are defeated with the circuit respectively
Enter VIN is held to connect, the first output terminal of the current limliting module 203 is connected with the control terminal of the second switch module 202, described
The second output terminal of current limliting module 203 is connected with the input terminal of the first switch module 201；The first switch module 201
Control terminal connected with the output terminal of the second switch module 202 after be connected to ground, the output of the first switch module 201
End is connected with the circuit output end VOUT.
The specific work process of current foldback circuit provided in this embodiment is described in detail below：
When the load for being connected to the circuit output end VOUT works normally, since the first switch module 201 reaches
To cut-in voltage, therefore the first switch module 201 turns on, so that the circuit output end VOUT is powered；It is meanwhile described
Current limliting module 203 is by the current feedback of the circuit output end VOUT to the second switch module 202, so that described second
Switch module 202 is not up to cut-in voltage, so that the second switch module 202 is ended, so that described first opens
It closes module 201 to reach cut-in voltage and be held on, therefore the circuit output end VOUT is remained powered on.
When be connected to the electric current of load of the circuit output end VOUT it is excessive when, the current limliting module 203 is by the electricity
The current feedback of road output terminal VOUT is to the second switch module 202, so that the second switch module 202 reaches unlatching
Voltage and turn on so that the first switch module 201 be not up to cut-in voltage and end so that circuit output end
VOUT is powered off.
In the utility model embodiment, by the way that the first switch module 201 is connected the circuit output end VOUT,
And pass through and the current limliting module 203 is connected between the first switch module 201 and the second switch module 202, with
So that the current limliting module 203 by the first switch module 201 by the current feedback of the circuit output end VOUT to institute
Second switch module 202 is stated, so that when the load for being connected to the circuit output end VOUT works normally, described first
Switch module 201 reaches cut-in voltage and turns on, so that the circuit output end VOUT is powered, while causes described second
Switch module 202 is not up to cut-in voltage and ends, so that the first switch module 201 reaches cut-in voltage and keeps leading
It is logical, so that the load for being connected to the circuit output end VOUT keeps normal work；When being connected to the circuit output end
When the electric current of the load of VOUT is excessive, the current limliting module 203 is by the first switch module 201 by the circuit output end
The current feedback of VOUT is to the second switch module 202, so that the second switch module 202 reaches cut-in voltage and leads
It is logical, so that the first switch module 201 is not up to cut-in voltage and ends, hence circuit output end VOUT breaks
Electricity, so as to protecting the load for being connected to the circuit output end VOUT, simplifying the structure of current foldback circuit and reducing cost.
With reference to shown in Fig. 1 to Fig. 3, in order to by the current feedback of the circuit output end VOUT to the second switch module
202, the electric current of the load of the circuit output end VOUT is connected to monitoring, and controls leading for the second switch module 202
Logical or cut-off so as to which the first switch module 201 be controlled to end or turned on, and then controls the circuit output end VOUT power-off
Or be powered, the current limliting module 203 in the present embodiment includes first resistor R1, second resistance R2 and 3rd resistor R3；
The first end of the first resistor R1 is connected with the input terminal of the current limliting module 203, the first resistor R1's
The second output terminal of second end and the first end of the second resistance R2 respectively with the current limliting module 203 is connected, and described second
The second end of resistance R2 is connected with the first output terminal of the first end of the 3rd resistor R3 respectively with the current limliting module 203,
The second end of the 3rd resistor R3 is connected to ground.
By the first resistor R1, the second resistance R2 and the 3rd resistor R3 by the circuit output end VOUT
Current feedback to the second switch module 202, the electric current of the load of the circuit output end VOUT is connected to monitoring, and
The on or off of the second switch module 202 is controlled, so as to which the first switch module 201 be controlled to end or turned on, into
And the circuit output end VOUT is controlled to power off or be powered.
In the utility model embodiment, due to the first resistor R1 by the first switch module 201 with it is described
Circuit output end VOUT connections, so as to be formed into a loop with the load for being connected to the circuit output end VOUT, therefore, the overcurrent
The current-limiting points of protection circuit determine that the resistance value of the first resistor R1 is got over by the resistance value and rated power of the first resistor R1
Small, then the first resistor R1 and the electric current that the circuit that the load is formed is flowed through are bigger, the current limliting of the current foldback circuit
Point is higher；The rated power of the first resistor R1 is bigger, then the circuit that the first resistor R1 is formed with the load is flowed through
Electric current it is bigger, the current-limiting points of the current foldback circuit are higher；The precision of the first resistor R1 is higher, then the overcurrent is protected
The current limliting precision of protection circuit is higher.
With reference to shown in Fig. 1 to Fig. 3, in order to enable conducting or not when the second switch module 202 reaches cut-in voltage
End when reaching cut-in voltage, so as to which the first switch module 201 be controlled to end or turned on, and then control the circuit output
It holds VOUT power-off or is powered, the second switch module 202 in the present embodiment includes the 3rd switching tube Q3, the 3rd switch
The base stage of pipe Q3 is connected with the control terminal of the second switch module 202, the emitter of the 3rd switching tube Q3 and described the
The input terminal connection of two switch modules 202, the collector of the 3rd switching tube Q3 and the output of the second switch module 202
End connection.When reaching cut-in voltage due to the 3rd switching tube Q3 conducting or not up to cut-in voltage when end, institute
Stating the 3rd switching tube Q3 has on or off state, so as to which the first switch module 201 is controlled to end or is turned on, into
And the circuit output end VOUT is controlled to power off or be powered.
With reference to shown in Fig. 1 to Fig. 3, turn on when reaching cut-in voltage for the 3rd switching tube Q3 or not up to open
End during voltage, so as to which the first switch module 201 is controlled to end or is turned on, and then control the circuit output end
VOUT powers off or is powered, and the 3rd switching tube Q3 in the present embodiment is preferably PNP type triode, the 3rd switching tube Q3
Base stage be PNP type triode base stage, the emitter of the transmitting extremely PNP type triode of the 3rd switching tube Q3 is described
The collector of the current collection extremely PNP type triode of 3rd switching tube Q3.When reaching cut-in voltage due to PNP type triode conducting or
Person ends when being not up to cut-in voltage, therefore has on or off shape using the 3rd switching tube Q3 of PNP type triode
State, so as to which the first switch module 201 is controlled to end or is turned on, and then control circuit output end VOUT power-off or
It is powered.
With reference to shown in Fig. 1 to Fig. 3, in order to protect the second switch module 202, so as to improve second switch module 202
Stability, and then improve the stability of the current foldback circuit, the current foldback circuit in the present embodiment further includes
5th resistance R5, the output terminal of the second switch module 202 are connected to ground by the 5th resistance R5.5th resistance
R5 plays metering function, to protect the second switch module 202, so as to improve the stability of second switch module 202, Jin Erti
The stability of the high current foldback circuit.
With reference to shown in Fig. 1 and Fig. 2, in order to enable conducting or not when the first switch module 201 reaches cut-in voltage
End when reaching cut-in voltage, so as to which the circuit output end VOUT be controlled to be powered or powered off, described first in the present embodiment
Switch module 201 includes first switch pipe Q1 and the 4th resistance R4, base stage and the first switch of the first switch pipe Q1
The control terminal connection of module 201, the emitter of the first switch pipe Q1 connect with the input terminal of the first switch module 201
It connects, the collector of the first switch pipe Q1 is connected with the output terminal of the first switch module 201；The first switch pipe Q1
Base stage be connected by the 4th resistance R4 with the circuit input end VIN.Since the first switch pipe Q1 reaches unlatching
During voltage conducting or not up to cut-in voltage when end, therefore the first switch pipe Q1 have on or off state, from
And the circuit output end VOUT can be controlled to be powered or power off.In addition, the 4th resistance R4 is the first switch pipe Q1
Bias current is provided, to ensure that the first switch pipe Q1 can be worked normally.
With reference to shown in Fig. 1 and Fig. 2, in order to enable the first switch pipe Q1 is turned on or is not up to when reaching cut-in voltage
End during cut-in voltage, so as to which the circuit output end VOUT be controlled to power off or be powered, the first switch in the present embodiment
Pipe Q1 is PNP type triode, and the base stage of the first switch pipe Q1 is the base stage of PNP type triode, the first switch pipe Q1
Transmitting extremely PNP type triode emitter, the collector of the current collection extremely PNP type triode of the first switch pipe Q1.
When reaching cut-in voltage due to PNP type triode conducting or not up to cut-in voltage when end, use PNP type triode
The first switch pipe Q1 there is on or off state, so as to the circuit output end VOUT be controlled to power off or logical
Electricity.
The specific work process of current foldback circuit provided in this embodiment is described in detail below：
The calculation formula of pressure difference VBE between the base stage and emitter of the 3rd switching tube Q3 is：
VBE=(VIN-IOUT*R1) * R2/ (R2+R3)+IOUT*R1,
Wherein, IOUT is the electric current by the circuit output end VOUT, it can be seen that, by setting the first resistor
The resistance value of R1, the second resistance R2 and the 3rd resistor R3 can set the current-limiting points of the circuit output end VOUT.It needs
It is noted that in the utility model embodiment, the load normal work for being connected to the circuit output end VOUT refers to institute
The electric current for stating circuit output end VOUT is less than current-limiting points；The electric current of the circuit output end VOUT is excessive to refer to the circuit output
The electric current of VOUT is held to be greater than or equal to current-limiting points.
When the load for being connected to the circuit output end VOUT works normally, since the first switch pipe Q1 reaches out
Voltage is opened, therefore the first switch pipe Q1 is turned on, so that the circuit output end VOUT is powered；Meanwhile first electricity
Resistance R1, the second resistance R2 and the 3rd resistor R3 open the current feedback of the circuit output end VOUT to the described 3rd
Pipe Q3 is closed, so that the 3rd switching tube Q3 is not up to cut-in voltage, so that the 3rd switching tube Q3 ends, and then
So that the base stage of the first switch pipe Q1 is still low potential, hence the first switch pipe Q1 reaches cut-in voltage and protects
Conducting is held, so that the circuit output end VOUT is remained powered on.
When be connected to the electric current of load of the circuit output end VOUT it is excessive when, the first resistor R1, described second
The resistance R2 and 3rd resistor R3 by the current feedback of the circuit output end VOUT to the 3rd switching tube Q3 so that
The 3rd switching tube Q3 reaches cut-in voltage and turns on, so that the base potential rise of the first switch pipe Q1, into
And so that the first switch pipe Q1 is not up to cut-in voltage and ends, hence circuit output end VOUT is powered off.
In the utility model embodiment, by by the first switch pipe Q1 connections circuit output end VOUT, and
By the way that the first resistor R1, the second resistance R2 and the 3rd resistor R3 are connected to the first switch pipe Q1 and institute
Between stating the 3rd switching tube Q3, so that the first resistor R1, the second resistance R2 and the 3rd resistor R3 pass through institute
First switch pipe Q1 is stated by the current feedback of the circuit output end VOUT to the 3rd switching tube Q3, so that when connection
In the load normal work of the circuit output end VOUT, the first switch pipe Q1 reaches cut-in voltage and turns on, and then
So that the circuit output end VOUT is powered, while causes the 3rd switching tube Q3 to be not up to cut-in voltage and end, so that
It obtains the first switch pipe Q1 to reach cut-in voltage and be held on, so that being connected to the negative of the circuit output end VOUT
It carries and keeps normal work；When be connected to the electric current of load of the circuit output end VOUT it is excessive when, the first resistor R1, institute
It is by the first switch pipe Q1 that the electric current of the circuit output end VOUT is anti-to state second resistance R2 and the 3rd resistor R3
The 3rd switching tube Q3 is fed to, so that the 3rd switching tube Q3 reaches cut-in voltage and turns on, so that described
One switching tube Q1 is not up to cut-in voltage and ends, hence circuit output end VOUT is powered off, so as to protect be connected to it is described
The load of circuit output end VOUT simplifies the structure of current foldback circuit and reduces cost.
With reference to shown in Fig. 1 and Fig. 3, in order to enable conducting or not when the first switch module 201 reaches cut-in voltage
End when reaching cut-in voltage, so as to which the circuit output end VOUT be controlled to power off or be powered, described first in the present embodiment
Switch module 201 includes second switch pipe Q2；
The grid of the second switch pipe Q2 is connected with the control terminal of the first switch module 201, the second switch
The source electrode of pipe Q2 is connected with the input terminal of the first switch module 201, the drain electrode and described first of the second switch pipe Q2
The output terminal connection of switch module 201.Due to turning on or not up to opening when the second switch pipe Q2 reaches cut-in voltage
End during voltage, therefore the circuit output end VOUT can be controlled to power off or be powered.
With reference to shown in Fig. 1 and Fig. 3, in order to enable the second switch pipe Q2 is turned on or is not up to when reaching cut-in voltage
End during cut-in voltage, so as to which the circuit output end VOUT be controlled to be powered or powered off, the second switch in the present embodiment
Pipe Q2 is P-channel metal-oxide-semiconductor, and the grid of the second switch pipe Q2 is the grid of P-channel metal-oxide-semiconductor, the second switch pipe Q2's
Source electrode is the source electrode of P-channel metal-oxide-semiconductor, and the drain electrode of the second switch pipe Q2 is the drain electrode of P-channel metal-oxide-semiconductor.Due to P-channel MOS
When pipe reaches cut-in voltage conducting or not up to cut-in voltage when end, therefore using P-channel metal-oxide-semiconductor the second switch
Pipe Q2 has on or off state, so as to which the circuit output end VOUT is controlled to be powered or is powered off.
Operation principle and the first switch pipe Q1 when due to the second switch pipe Q2 being P-channel metal-oxide-semiconductor are positive-negative-positive
Operation principle during triode is identical, and details are not described herein.
The utility model embodiment also provides a kind of electronic equipment, including the overcurrent protection described in any of the above embodiment
Circuit.
To sum up, the current foldback circuit and electronic equipment of the utility model, by the way that the first switch module 201 is connected
The circuit output end VOUT, and pass through and the current limliting module 203 is connected to the first switch module 201 and described second
Between switch module 202 so that the current limliting module 203 by the first switch module 201 by the circuit output end
The current feedback of VOUT is to the second switch module 202, so that when the load for being connected to the circuit output end VOUT
During normal work, the first switch module 201 reaches cut-in voltage and turns on, so that the circuit output end VOUT leads to
Electricity, while the second switch module 202 is caused to be not up to cut-in voltage and end, so that the first switch module 201
Reach cut-in voltage and be held on, so that the load for being connected to the circuit output end VOUT keeps normal work；When
Be connected to the load of the circuit output end VOUT electric current it is excessive when, the current limliting module 203 passes through the first switch mould
Block 201 is by the current feedback of the circuit output end VOUT to the second switch module 202, so that the second switch mould
Block 202 reaches cut-in voltage and turns on, so that the first switch module 201 is not up to cut-in voltage and ends, therefore
So that circuit output end VOUT is powered off, so as to protect the load for being connected to the circuit output end VOUT, overcurrent protection is simplified
The structure of circuit and reduce cost.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
For art personnel, on the premise of the utility model technical principle is not departed from, several improvement and replacement can also be made, these change
The scope of protection of the utility model is also should be regarded as into replacement.
Claims (10)
1. a kind of current foldback circuit, which is characterized in that including circuit input end, first switch module, second switch module, limit
Flow module and circuit output end；
The input terminal of the current limliting module and the input terminal of the second switch module are connected respectively with the circuit input end, institute
The first output terminal for stating current limliting module is connected with the control terminal of the second switch module, the second output terminal of the current limliting module
It is connected with the input terminal of the first switch module；The control terminal of the first switch module and the second switch module it is defeated
It is connected to ground after outlet connection, the output terminal of the first switch module is connected with the circuit output end.
2. current foldback circuit as described in claim 1, which is characterized in that the current limliting module includes first resistor, second
Resistance and 3rd resistor；
The first end of the first resistor is connected with the input terminal of the current limliting module, the second end of the first resistor and described
Second output terminal of the first end of second resistance respectively with the current limliting module is connected, the second end of the second resistance with it is described
First output terminal of the first end of 3rd resistor respectively with the current limliting module is connected, and second end and the ground of the 3rd resistor connect
It connects.
3. current foldback circuit as claimed in claim 1 or 2, which is characterized in that the first switch module is opened including first
Pipe and the 4th resistance are closed, the base stage of the first switch pipe is connected with the control terminal of the first switch module, and described first opens
The emitter for closing pipe is connected with the input terminal of the first switch module, and the collector of the first switch pipe is opened with described first
Close the output terminal connection of module；The base stage of the first switch pipe is connected by the 4th resistance with the circuit input end.
4. current foldback circuit as claimed in claim 3, which is characterized in that the first switch pipe be PNP type triode, institute
The base stage for stating first switch pipe is the base stage of PNP type triode, the hair of the transmitting extremely PNP type triode of the first switch pipe
Emitter-base bandgap grading, the collector of the current collection extremely PNP type triode of the first switch pipe.
5. current foldback circuit as claimed in claim 1 or 2, which is characterized in that the first switch module is opened including second
Guan Guan；
The grid of the second switch pipe is connected with the control terminal of the first switch module, the source electrode of the second switch pipe with
The input terminal connection of the first switch module, the drain electrode of the second switch pipe connect with the output terminal of the first switch module
It connects.
6. current foldback circuit as claimed in claim 5, which is characterized in that the second switch pipe be P-channel metal-oxide-semiconductor, institute
The grid for stating second switch pipe is the grid of P-channel metal-oxide-semiconductor, and the source electrode of the second switch pipe is the source electrode of P-channel metal-oxide-semiconductor,
The drain electrode of the second switch pipe is the drain electrode of P-channel metal-oxide-semiconductor.
7. current foldback circuit as claimed in claim 1 or 2, which is characterized in that the second switch module is opened including the 3rd
Guan Guan, the base stage of the 3rd switching tube are connected with the control terminal of the second switch module, the transmitting of the 3rd switching tube
Pole is connected with the input terminal of the second switch module, and the collector of the 3rd switching tube is defeated with the second switch module
Outlet connects.
8. current foldback circuit as claimed in claim 7, which is characterized in that the 3rd switching tube be PNP type triode, institute
The base stage for stating the 3rd switching tube is the base stage of PNP type triode, the hair of the transmitting extremely PNP type triode of the 3rd switching tube
Emitter-base bandgap grading, the collector of the current collection extremely PNP type triode of the 3rd switching tube.
9. current foldback circuit as claimed in claim 1 or 2, which is characterized in that the current foldback circuit further includes the 5th
Resistance, the output terminal of the second switch module are connected to ground by the 5th resistance.
10. a kind of electronic equipment, which is characterized in that including such as claim 1-9 any one of them current foldback circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721405621.3U CN207398813U (en) | 2017-10-26 | 2017-10-26 | Current foldback circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721405621.3U CN207398813U (en) | 2017-10-26 | 2017-10-26 | Current foldback circuit and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN207398813U true CN207398813U (en) | 2018-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721405621.3U Active CN207398813U (en) | 2017-10-26 | 2017-10-26 | Current foldback circuit and electronic equipment |
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| Country | Link |
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| CN (1) | CN207398813U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108963999A (en) * | 2018-08-07 | 2018-12-07 | 中国航空工业集团公司雷华电子技术研究所 | A kind of Inrush current restraining device |
| CN112345908A (en) * | 2020-10-27 | 2021-02-09 | 郑州嘉晨电器有限公司 | Current detection circuit of power switch tube |
-
2017
- 2017-10-26 CN CN201721405621.3U patent/CN207398813U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108963999A (en) * | 2018-08-07 | 2018-12-07 | 中国航空工业集团公司雷华电子技术研究所 | A kind of Inrush current restraining device |
| CN108963999B (en) * | 2018-08-07 | 2020-02-14 | 中国航空工业集团公司雷华电子技术研究所 | Surge current suppressor |
| CN112345908A (en) * | 2020-10-27 | 2021-02-09 | 郑州嘉晨电器有限公司 | Current detection circuit of power switch tube |
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