CN106787052A - A kind of protection circuit and charger - Google Patents
A kind of protection circuit and charger Download PDFInfo
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- CN106787052A CN106787052A CN201710204093.3A CN201710204093A CN106787052A CN 106787052 A CN106787052 A CN 106787052A CN 201710204093 A CN201710204093 A CN 201710204093A CN 106787052 A CN106787052 A CN 106787052A
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Abstract
The embodiment of the present invention provides a kind of protection circuit and charger; protection circuit is applied to include the charger of rectification circuit and capacitance module, and protection circuit includes detection module, switch module and control module, wherein; detection module is connected with rectification circuit, the output voltage for detecting rectification circuit；Control module is connected with detection module and switch module respectively, when the output voltage of rectification circuit is more than predeterminated voltage, is disconnected for controlling switch module；Switch module is connected with detection module and capacitance module respectively, when the output voltage of rectification circuit is less than or equal to predeterminated voltage, switch module conducting.The embodiment of the present invention is when the output voltage of rectification circuit is more than predeterminated voltage; disconnect charge circuit; the parts such as rectification circuit and capacitance module in realization protection charge circuit; and when the output voltage of rectification circuit is less than or equal to predeterminated voltage; recover the normal work of charge circuit, effectively increase the reliability and Consumer's Experience of charger.
Description
Technical field
The present invention relates to field of circuit technology, more particularly to a kind of protection circuit and a kind of charger.
Background technology
At present, the usage scenario of charger is sufficiently complex, and charger fails because input voltage is too high often, charger
Failure can burn for input capacitance bulge, input rectifying tube failure, protection fuse.Charger failure has had a strong impact on use
The experience at family, also increases the cost that manufacturer prevents charger from failing.
Generally in the input protection circuit of charger, increase piezo-resistance prevents defeated to prior art as protection device
Entering overtension causes the situation that charger fails to occur.Wherein, the operation principle of piezo-resistance is：When piezo-resistance two ends
When voltage is less than the threshold values of piezo-resistance, a piezo-resistance resistance infinitely great equivalent to resistance flows through the electricity of piezo-resistance
Stream very little；When the voltage at piezo-resistance two ends is higher than the threshold values of piezo-resistance, piezo-resistance infinitesimal equivalent to resistance one
Individual resistance, the electric current for flowing through piezo-resistance is very big.So, realize protecting the component after piezo-resistance not receive high input voltage
Impact.
But, in the input protection circuit of charger, increase piezo-resistance and also have the following disadvantages：
One, when piezo-resistance is used for sudden-wave absorbing, if the high input voltage certain time of charger, pressure-sensitive electricity
Resistance will greatly be caused very much self-heating due to electric current and be burnt, and then burn the fuse of charger, charger is failed.
2nd, when the voltage at piezo-resistance two ends is less than the threshold values of piezo-resistance, piezo-resistance is constantly in low current and leads
Logical state, with charger temperature rising and use time it is elongated, the leakage current for flowing through piezo-resistance becomes larger, pressure-sensitive
Resistance enters high impedance short-circuit condition, charger is failed.
The content of the invention
In view of the above problems, the purpose of the embodiment of the present invention is to provide a kind of protection circuit and a kind of corresponding charging
Device, to solve the input protection circuit of charger in the prior art, piezo-resistance can cause the problem that charger fails.
In order to solve the above problems, the embodiment of the invention discloses a kind of protection circuit, the protection circuit is applied to one
In charger, the charger also includes rectification circuit and capacitance module, and the protection circuit includes detection module, switch module
And control module, wherein, the detection module is connected with the rectification circuit, the output electricity for detecting the rectification circuit
Pressure；The control module is connected with the detection module and the switch module respectively, in the output voltage of the rectification circuit
During more than the predeterminated voltage, for controlling the switch module to disconnect；The switch module respectively with the detection module and
The capacitance module connection, when the output voltage of the rectification circuit is less than or equal to predeterminated voltage, the switch module is led
It is logical.
In order to solve the above problems, the embodiment of the invention also discloses a kind of charger, including rectification circuit, capacitance module
With described protection circuit.
The embodiment of the present invention includes advantages below：Include detection module, switch module and control by setting protection circuit
Molding block, detection module detects the output voltage of rectification circuit；Control module is connected with detection module and switch module respectively,
When the output voltage of rectification circuit is more than predeterminated voltage, i.e., when input voltage is more than default input voltage, control module control is opened
Close module to disconnect, the charge circuit of the composition such as rectification circuit and capacitance module disconnects；Switch module respectively with detection module and electricity
Molar block is connected, and when the output voltage of rectification circuit is less than or equal to predeterminated voltage, i.e., input voltage is less than or equal to default
During input voltage, switch module conducting, the charge circuit normal work of the composition such as rectification circuit and capacitance module.So, realize
When input voltage is more than default input voltage, the part such as rectification circuit and capacitance module in protection charge circuit, and defeated
When entering voltage less than or equal in default input voltage, it is ensured that charge circuit can recover normal work, effectively increase charging
The reliability and Consumer's Experience of device.
Brief description of the drawings
Fig. 1 is a kind of structured flowchart of protection circuit of the embodiment of the present invention one；
Fig. 2 is a kind of structural representation of protection circuit of the embodiment of the present invention two；
Fig. 3 is the structural representation of another protection circuit of the embodiment of the present invention two；
Fig. 4 is a kind of structural representation of protection circuit of the embodiment of the present invention three；
Fig. 5 is the structural representation of another protection circuit of the embodiment of the present invention three.
Specific embodiment
It is below in conjunction with the accompanying drawings and specific real to enable the above objects, features and advantages of the present invention more obvious understandable
The present invention is further detailed explanation to apply mode.
Embodiment one
Reference picture 1, it illustrates a kind of structured flowchart of the embodiment of protection circuit 1 of the invention, the protection circuit 1 is applied
In charger, the charger also includes rectification circuit 2 and capacitance module 3, and the protection circuit 1 of the embodiment of the present invention includes：Detection
Module 11, switch module 12 and control module 13, wherein, detection module 11 is connected with rectification circuit 2, for detecting rectified current
The output voltage on road 2；Control module 13 is connected with detection module 11 and switch module 12 respectively, in the output electricity of rectification circuit 2
When pressure is more than predeterminated voltage, disconnected for controlling switch module 12；Switch module 12 respectively with detection module 11 and capacitance module 3
Connection, when the output voltage of rectification circuit 2 is less than or equal to predeterminated voltage, switch module 12 is turned on.
Specifically, rectification circuit 2, capacitance module 3 and protection circuit 1 constitute the charge circuit of charger.Specifically, whole
When the output voltage of current circuit 2 is more than predeterminated voltage, the input voltage of charger is more than default input voltage, in protection circuit 1
The controlling switch module 12 of control module 13 disconnect, i.e., charge circuit disconnect；It is less than or equal in the output voltage of rectification circuit 2
During predeterminated voltage, input voltage is less than or equal to default input voltage, and the switch module 12 in protection circuit 1 is turned on, that is, charged
Recover normal work in loop.Wherein, default input voltage can be less than or equal to the maximum input voltage of charger, predeterminated voltage
Can be according to the type (such as half-wave rectifying circuit, full-wave rectifying circuit, bridge rectifier) of rectification circuit 2 and default input
The size of voltage is configured.
So, realize that, when input voltage is more than default input voltage, protection circuit 1 disconnects charge circuit, protection is charged
The parts such as rectification circuit 2, capacitance module 3 in loop, and when input voltage is less than or equal in default input voltage, switch
Module 12 is turned on, it is ensured that charge circuit can recover normal work, effectively increases the reliability and Consumer's Experience of charger.
The protection circuit of the embodiment of the present invention one includes advantages below：By setting protection circuit, the protection circuit bag
Detection module, switch module and control module are included, detection module detects the output voltage of rectification circuit；Control module respectively with
Detection module and switch module are connected, and when the output voltage of rectification circuit is more than predeterminated voltage, i.e., input voltage is more than default
During input voltage, control module controlling switch module is disconnected, and the charging of the composition such as rectification circuit, capacitance module and protection circuit is returned
Road disconnects；Switch module is connected with detection module and capacitance module respectively, is less than or equal in the output voltage of rectification circuit pre-
If during voltage, i.e., when input voltage is less than or equal to default input voltage, switch module conducting, rectification circuit, capacitance module and
The charge circuit normal work of the compositions such as protection circuit.So, realize that protection is filled when input voltage is more than default input voltage
The parts such as rectification circuit and capacitance module in electrical circuit, and when input voltage is less than or equal in default input voltage, really
Protecting charge circuit can recover normal work, effectively increase the reliability and Consumer's Experience of charger.
Embodiment two
Reference picture 2 and Fig. 3, in one particular embodiment of the present invention, switch module 12 in the protection circuit 1 can be with
Including the first driver element 121 and the first NMOS tube N1, wherein, the first driver element 121 respectively with detection module 11, control mould
The output end of block 13, the grid of the first NMOS tube N1 and drain electrode connection, the source electrode of the first NMOS tube N1 are connected with capacitance module 3.
Specifically, when the output voltage of rectification circuit 2 is less than or equal to predeterminated voltage, the first driver element 121 drives a NMOS
Pipe N1, the first NMOS tube N1 conducting, charge circuit normal work；When the output voltage of rectification circuit 2 is more than predeterminated voltage, control
Control the first driver element 121 of molding block 13 stops driving the first NMOS tube N1, the first NMOS tube N1 disconnection, disconnection to charge back
Road.
Reference picture 2 and Fig. 3, in one particular embodiment of the present invention, detection module 11 can include：First resistor
One end of R1, first resistor R1 are connected with the first end of rectification circuit 2；First voltage-stabiliser tube Z1, the negative electrode of the first voltage-stabiliser tube Z1 with
The other end connection of first resistor R1；Second resistance R2, one end of second resistance R2 is connected with the anode of the first voltage-stabiliser tube Z1, the
The other end of two resistance R2 is connected with the second end of rectification circuit 2.Specifically, the first voltage-stabiliser tube Z1 can be the pole of the first voltage stabilizing two
Pipe.
Reference picture 2 and Fig. 3, in one particular embodiment of the present invention, control module 13 can include：First switch device
Part, the control end of first switch device is connected with the anode of the first voltage-stabiliser tube Z1, and the first end of first switch device is used as control
The output end of module 13, the second end of first switch device is connected with the other end of second resistance R2.
Alternatively, first switch device can include the first triode Q1 or the second NMOS tube N2.At one of the invention
In embodiment, reference picture 2, first switch device can include the first triode Q1, and the base stage of the first triode Q1 is steady with first
The anode connection of pressure pipe Z1, the colelctor electrode of the first triode Q1 as control module 13 output end, the hair of the first triode Q1
Emitter-base bandgap grading is connected with the other end of second resistance R2.
In another embodiment of the present invention, reference picture 3, first switch device can include the second NMOS tube N2, the
The grid of two NMOS tube N2 is connected with the anode of the first voltage-stabiliser tube Z1, and the drain electrode of the first NMOS tube N1 is used as the defeated of control module 13
Go out end, the source electrode of the first NMOS tube N1 is connected with the other end of second resistance R2.Due to compared with triode, the control of NMOS tube
Precision is higher, therefore, protection circuit is more preferable compared with the sensitivity of protection circuit in Fig. 2 in Fig. 3.
Reference picture 2 and Fig. 3, in one particular embodiment of the present invention, the first driver element 121 can include：3rd
One end of resistance R3,3rd resistor R3 are connected with the other end of first resistor R1, the other end and control module of 3rd resistor R3
13 output end connection；The negative electrode of the second voltage-stabiliser tube Z2, the second voltage-stabiliser tube Z2 respectively with the other end of 3rd resistor R3 and first
The grid connection of NMOS tube N1, the anode of the second voltage-stabiliser tube Z2 the second end respectively with first switch device and the first NMOS tube N1
Drain electrode connection.Specifically, the second voltage-stabiliser tube Z2 can be the second voltage-regulator diode.
Specifically, capacitance module 3 can include at least one electric capacity.For example, in one particular embodiment of the present invention,
Reference picture 2 and Fig. 3, capacitance module 3 can be the first electric capacity C1.
Reference picture 2 and Fig. 3, in one particular embodiment of the present invention, protection circuit 1 can also include：First filtering
Module 14, one end of the first filtration module 14 is connected with one end of 3rd resistor R3, the other end of the first filtration module 14 and
The drain electrode connection of one NMOS tube N1, the drain electrode electric signal of the first the first NMOS tube N1 of filtration module 14 pairs is filtered.Specifically,
First filtration module 14 can be the second electric capacity C2.
In Fig. 2 and Fig. 3, the operation principle of protection circuit 1 is：It is whole when input voltage is less than or equal to default input voltage
When the output voltage of current circuit 2 is less than or equal to predeterminated voltage, first resistor R1 and 3rd resistor R3 is carried for the second voltage-stabiliser tube Z2
Power supply stream, burning voltage is formed at the second voltage-stabiliser tube Z2 two ends, there is provided the gate voltage needed for the first NMOS tube N1 conductings, now
First NMOS tube N1 is turned on.Because the undertension at the second electric capacity C2 two ends is so that the first voltage-stabiliser tube Z1 is open-minded, second resistance R2
There is no electric current to pass through, first switch device is not turned on.
When input voltage is more than default input voltage, when the output voltage of rectification circuit 2 is more than predeterminated voltage, the second electric capacity
Higher than the voltage at the first voltage-stabiliser tube Z1 two ends, the first voltage-stabiliser tube Z1 is turned on the voltage at C2 two ends, when the electricity at second resistance R2 two ends
Pressure with the increase of electric current reach the conducting voltage of first switch device when, first switch break-over of device, the first NMOS tube N1's
Grid voltage is decreased below the first NMOS tube N1 conducting voltages, and the first NMOS tube N1 disconnects, in realization protection charge circuit
The parts such as rectification circuit 2, capacitance module 3 and fuse F.
Specifically, due to when input voltage is less than or equal to default input voltage, there is electric leakage in the first voltage-stabiliser tube Z1
Stream, setting second resistance R2 can avoid first switch device from being turned on when input voltage is less than or equal to default input voltage,
Ensure the reliability of protection circuit 1.
Specifically, when input voltage is more than default input voltage, when the first voltage-stabiliser tube Z1 and first switch break-over of device, the
Three resistance R3 can ensure first switch device control end and first end voltage it is unequal, it is ensured that first switch device is in
Conducting state, the first NMOS tube N1 are off, it is ensured that the reliability of protection circuit 1.
The protection circuit of the embodiment of the present invention two includes advantages below：By setting protection circuit, the protection circuit bag
Detection module, switch module, control module and the first filtration module are included, detection module can be by first resistor, the first voltage stabilizing
Pipe and second resistance are constituted, and detection module detects the output voltage of rectification circuit；Control module can be by first switch device (example
Such as the first triode or the second NMOS tube) constitute, control module is connected with detection module and switch module respectively, in rectification circuit
Output voltage when being more than predeterminated voltage, i.e., when input voltage is more than default input voltage, control module controlling switch module is broken
Open, the charge circuit of the composition such as rectification circuit, capacitance module and protection circuit disconnects；Switch module can be by 3rd resistor,
Two voltage-stabiliser tubes and the first NMOS tube are constituted, and switch module is connected with detection module and capacitance module respectively, in the defeated of rectification circuit
When going out voltage less than or equal to predeterminated voltage, i.e., when input voltage is less than or equal to default input voltage, switch module conducting is whole
The charge circuit normal work of the compositions such as current circuit, capacitance module and protection circuit, wherein, the first filtration module is to a NMOS
The drain electrode electric signal of pipe is filtered.So, when input voltage is more than default input voltage, the low level of charge circuit is disconnected
The parts such as side, rectification circuit and capacitance module in realization protection charge circuit, and it is defeated less than or equal to default in input voltage
When entering in voltage, it is ensured that charge circuit can recover normal work, the reliability and Consumer's Experience of charger are effectively increased.
Embodiment three
Reference picture 4 and Fig. 5, in one particular embodiment of the present invention, switch module 12 in the protection circuit 1 can be with
Including the second driver element 121 and the first PMOS P1, wherein, the second driver element 121 respectively with detection module 11, control mould
The output end of block 13, the grid of the first PMOS P1 and source electrode connection, the drain electrode of the first PMOS P1 are connected with capacitance module 3.
Specifically, when the output voltage of rectification circuit 2 is less than or equal to predeterminated voltage, the second driver element 121 drives a PMOS
Pipe P1, the first PMOS P1 conducting；When the output voltage of rectification circuit 2 is more than predeterminated voltage, the control of control module 13 second
Driver element 121 stops driving the first PMOS P1, the first PMOS P1 disconnection.
Reference picture 4 and Fig. 5, in one particular embodiment of the present invention, detection module 11 can include：4th resistance
R4, one end of the 4th resistance R4 is connected with the first end of rectification circuit 2；5th resistance R5, one end and the 4th of the 5th resistance R5
The other end connection of resistance R4, the other end of the 5th resistance R5 is connected with the second end of rectification circuit 2；3rd voltage-stabiliser tube Z3, the
The negative electrode of three voltage-stabiliser tube Z3 is connected with the other end of the 4th resistance R4；6th resistance R6, one end of the 6th resistance R6 is steady with the 3rd
The anode connection of pressure pipe Z3, the other end of the 6th resistance R6 is connected with the other end of the 5th resistance R5.Specifically, the 3rd voltage-stabiliser tube
Z3 can be the 3rd voltage-regulator diode.
Reference picture 4 and Fig. 5, in one particular embodiment of the present invention, control module 13 can include：Second switch device
Part, the control end of second switch device is connected with the anode of the 3rd voltage-stabiliser tube Z3, and the first end of second switch device is used as control
The output end of module 13, the second end of second switch device is connected with the other end of the 6th resistance R6.
Reference picture 4 and Fig. 5, in one particular embodiment of the present invention, the second driver element 121 can include：7th
Resistance R7, one end of the 7th resistance R7 is connected with the other end of the 4th resistance R4, the other end and control module of the 7th resistance R7
13 output end connection；One end of 8th resistance R8, the 8th resistance R8 one end respectively with the 4th resistance R4 and the first PMOS
The source electrode connection of P1；One end of 9th resistance R9, the 9th resistance R9 respectively with the other end and the first PMOS of the 8th resistance R8
The grid connection of P1；3rd switching device, the control end of the 3rd switching device is connected with the output end of control module 13, and the 3rd opens
The first end for closing device is connected with the other end of the 9th resistance R9, and the of the second end of the 3rd switching device and second switch device
Two ends connect.
Alternatively, second switch device can include the second triode Q2 or the 3rd NMOS tube N3, and the 3rd switching device can
With including the 3rd triode Q3 or the 4th NMOS tube N4.In one embodiment of the invention, reference picture 4, second switch device
The second triode Q2 can be included, the 3rd switching device can include the 3rd triode Q3.Wherein, the base stage of the second triode Q2
Anode with the 3rd voltage-stabiliser tube Z3 is connected, the colelctor electrode of the second triode Q2 as control module 13 output end, the two or three pole
The emitter stage of pipe Q2 is connected with the other end of the 6th resistance R6.The base stage of the 3rd triode Q3 connects with the output end of control module 13
Connect, the colelctor electrode of the 3rd triode Q3 is connected with the other end of the 9th resistance R9, the emitter stage and the two or three of the 3rd triode Q3
The emitter stage connection of pole pipe Q2.
In another embodiment of the present invention, reference picture 5, second switch device can include the 3rd NMOS tube N3, the
Three switching devices can include the 4th NMOS tube N4.Wherein, the anode of the grid of the 3rd NMOS tube N3 and the 3rd voltage-stabiliser tube Z3 connects
Connect, the drain electrode of the 3rd NMOS tube N3 as control module 13 output end, the source electrode of the 3rd NMOS tube N3 and the 6th resistance R6's
The other end is connected.The grid of the 4th NMOS tube N4 is connected with the output end of control module 13, the drain electrode of the 4th NMOS tube N4 and the
The other end connection of nine resistance R9, the source electrode of the 4th NMOS tube N4 is connected with the source electrode of the 3rd NMOS tube N3.
Because compared with triode, the control accuracy of NMOS tube is higher, therefore, protection circuit is compared with protection electricity in Fig. 4 in Fig. 5
The sensitivity on road is more preferable.
Reference picture 4 and Fig. 5, in one particular embodiment of the present invention, protection circuit 1 can also include：Second filtering
Module 15, one end of the second filtration module 15 is connected with the grid of the first PMOS P1, the other end of the second filtration module 15 with
The second end connection of the 3rd switching device, the grid electric signal of the second the first PMOS P1 of filtration module 15 pairs is filtered.Tool
Body ground, the second filtration module 15 can be the 3rd electric capacity C3.
In Fig. 4 and Fig. 5, the operation principle of protection circuit 1 is：It is whole when input voltage is less than or equal to default input voltage
When the output voltage of current circuit 2 is less than or equal to predeterminated voltage, the 4th resistance R4, the 7th resistance R7, the 8th resistance R8 and the 9th
Resistance R9 provides driving current, the 3rd switch device conductive, the grid voltage (i.e. of the first PMOS P1 for the 3rd switching device
One terminal voltage of two filtration modules) threshold voltage of the first PMOS P1, the first PMOS P1 are pulled low to by the 9th resistance R9
Conducting.Charger normal work.
When input voltage is more than default input voltage, when the output voltage of rectification circuit 2 is more than predeterminated voltage, the 4th resistance
After R4 and the 5th resistance R5 partial pressures, conducting voltage of the 5th resistance R5 both end voltages higher than the 3rd voltage-stabiliser tube Z3, the 3rd voltage-stabiliser tube
Z3 is turned on, and the 6th resistance R6 both end voltages are higher than the conducting voltage of second switch device, second switch break-over of device, the 3rd switch
Device base voltage is dragged down, and the 3rd switching device disconnects, and the grid voltage of the first PMOS P1 breaks less than conducting threshold voltage
Open, charge circuit disconnects.The parts such as rectification circuit 2, capacitance module 3 and fuse F in realization protection charge circuit.
Specifically, due to when input voltage is less than or equal to default input voltage, there is electric leakage in the 3rd voltage-stabiliser tube Z3
Stream, setting the 6th resistance R6 can avoid second switch device from being turned on when input voltage is less than or equal to default input voltage,
Ensure the reliability of protection circuit 1.
Specifically, when input voltage is more than default input voltage, when the first voltage-stabiliser tube Z1 and first switch break-over of device, the
Seven resistance R7 can ensure second switch device control end and first end voltage it is unequal, it is ensured that second switch device is in
Conducting state, the 3rd switching device are off, the first PMOS P1 is off, it is ensured that protection circuit 1 can
By property.
Specifically, because when input voltage is more than default input voltage, the grid voltage of the first PMOS P1 is relatively low, the
One PMOS P1 bears high voltage, and now, the 9th resistance R9 can improve the grid voltage of the first PMOS P1, realizes reducing the
The voltage that one PMOS P1 bears, protects a PMOS, improves the reliability of protection circuit 1.
The protection circuit of the embodiment of the present invention three includes advantages below：By setting protection circuit, the protection circuit bag
Include detection module, switch module, control module and the second filtration module, detection module can by the 4th resistance, the 5th resistance,
3rd voltage-stabiliser tube and the 6th resistance are constituted, and detection module detects the output voltage of rectification circuit；Control module can be opened by second
Close device (such as the second triode or the 3rd NMOS tube) to constitute, control module is connected with detection module and switch module respectively,
When the output voltage of rectification circuit is more than predeterminated voltage, i.e., when input voltage is more than default input voltage, control module control
Switch module disconnects, and the charge circuit of the composition such as rectification circuit, capacitance module and protection circuit disconnects；Switch module can be by
Seven resistance, the 8th resistance, the 9th resistance, the 3rd switching device (the 3rd triode or the 4th NMOS tube) and the first PMOS structure
Into switch module is connected with detection module and capacitance module respectively, electric less than or equal to default in the output voltage of rectification circuit
During pressure, i.e., when input voltage is less than or equal to default input voltage, switch module conducting, rectification circuit, capacitance module and protection
The charge circuit normal work of the compositions such as circuit, wherein, the second filtration module is filtered to the grid electric signal of the first PMOS
Ripple.So, when input voltage is more than default input voltage, the high-side of charge circuit is disconnected, realizes protection charge circuit
In rectification circuit and the part such as capacitance module, and when input voltage is less than or equal in default input voltage, it is ensured that charge
Loop can recover normal work, effectively increase the reliability and Consumer's Experience of charger.
Example IV
The embodiment of the present invention four also discloses a kind of charger, reference picture 1, and it includes rectification circuit 2, the and of capacitance module 3
Above-mentioned protection circuit 1 etc..
The charger of the embodiment of the present invention four includes advantages below：Protected by being set between rectification circuit and capacitance module
Protection circuit, realizes when input voltage is more than default input voltage, rectification circuit and capacitance module in protection charge circuit etc.
Part, and when input voltage is less than or equal in default input voltage, it is ensured that charge circuit can recover normal work, effectively
Improve the reliability and Consumer's Experience of charger.
For charger embodiment, because it includes protection circuit, so description is fairly simple, related part ginseng
See the part explanation of protection circuit embodiment.
It should be noted that the protection circuit of the embodiment of the present invention includes but are not limited to apply in power rings such as chargers
In border, can be applied in any circuit structure with rectification circuit and capacitance module, for example, can applied including rectification
In the LED drive circuit or motor-drive circuit of circuit and capacitance module.
Each embodiment in this specification is described by the way of progressive, what each embodiment was stressed be with
The difference of other embodiment, between each embodiment identical similar part mutually referring to.
Although having been described for the preferred embodiment of the embodiment of the present invention, those skilled in the art once know base
This creative concept, then can make other change and modification to these embodiments.So, appended claims are intended to be construed to
Including preferred embodiment and fall into having altered and changing for range of embodiment of the invention.
Finally, in addition it is also necessary to explanation, herein, such as first and second or the like relational terms be used merely to by
One entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operation
Between there is any this actual relation or order.And, term " including ", "comprising" or its any other variant meaning
Covering including for nonexcludability, so that process, method, article or terminal device including a series of key elements are not only wrapped
Those key elements, but also other key elements including being not expressly set out are included, or also includes being this process, method, article
Or the intrinsic key element of terminal device.In the absence of more restrictions, by wanting that sentence "including a ..." is limited
Element, it is not excluded that also there is other identical element in the process including the key element, method, article or terminal device.
Above to a kind of protection circuit provided by the present invention and a kind of charger, it is described in detail, herein should
Principle of the invention and implementation method are set forth with specific case, the explanation of above example is only intended to help and manages
The solution method of the present invention and its core concept；Simultaneously for those of ordinary skill in the art, according to thought of the invention,
Be will change in specific embodiment and range of application, in sum, this specification content should not be construed as to this hair
Bright limitation.
Claims (12)
1. a kind of protection circuit, it is characterised in that the protection circuit is applied in a charger, the charger also includes whole
Current circuit and capacitance module, the protection circuit include detection module, switch module and control module, wherein,
The detection module is connected with the rectification circuit, the output voltage for detecting the rectification circuit；
The control module is connected with the detection module and the switch module respectively, in the output voltage of the rectification circuit
During more than the predeterminated voltage, for controlling the switch module to disconnect；
The switch module is connected with the detection module and the capacitance module respectively, in the output voltage of the rectification circuit
During less than or equal to predeterminated voltage, the switch module conducting.
2. protection circuit according to claim 1, it is characterised in that the switch module includes the first driver element and the
One NMOS tube, wherein,
First driver element respectively with the detection module, the output end of the control module, first NMOS tube
Grid and drain electrode are connected, and the source electrode of first NMOS tube is connected with the capacitance module；
When the output voltage of the rectification circuit is less than or equal to predeterminated voltage, first driver element drives described first
NMOS tube, when the output voltage of the rectification circuit is more than the predeterminated voltage, the control module control described first is driven
Moving cell stops driving first NMOS tube.
3. protection circuit according to claim 2, it is characterised in that the detection module includes：
First resistor, one end of the first resistor is connected with the first end of the rectification circuit；
First voltage-stabiliser tube, the negative electrode of first voltage-stabiliser tube is connected with the other end of the first resistor；
Second resistance, one end of the second resistance is connected with the anode of first voltage-stabiliser tube, the second resistance it is another
End is connected with the second end of the rectification circuit.
4. protection circuit according to claim 3, it is characterised in that the control module includes：
First switch device, the control end of the first switch device is connected with the anode of first voltage-stabiliser tube, and described first
The first end of switching device as the control module output end, the second end of the first switch device and described second electricity
The other end connection of resistance.
5. protection circuit according to claim 4, it is characterised in that first driver element includes：
3rd resistor, one end of the 3rd resistor is connected with the other end of the first resistor, the 3rd resistor it is another
End is connected with the output end of the control module；
Second voltage-stabiliser tube, the negative electrode of second voltage-stabiliser tube respectively with the other end and first NMOS tube of the 3rd resistor
Grid connection, the anode of second voltage-stabiliser tube the second end respectively with the first switch device and first NMOS tube
Drain electrode connection.
6. protection circuit according to claim 5, it is characterised in that also include：
First filtration module, one end of first filtration module is connected with one end of the 3rd resistor, first filtering
The other end of module is connected with the drain electrode of first NMOS tube.
7. protection circuit according to claim 1, it is characterised in that the switch module includes the second driver element and the
One PMOS, wherein,
Second driver element respectively with the detection module, the output end of the control module, first PMOS
Grid and source electrode are connected, and the drain electrode of first PMOS is connected with the capacitance module；
When the output voltage of the rectification circuit is less than or equal to predeterminated voltage, second driver element drives described first
PMOS, when the output voltage of the rectification circuit is more than the predeterminated voltage, the control module control described second is driven
Moving cell stops driving first PMOS.
8. protection circuit according to claim 7, it is characterised in that the detection module includes：
4th resistance, one end of the 4th resistance is connected with the first end of the rectification circuit；
5th resistance, one end of the 5th resistance is connected with the other end of the 4th resistance, the 5th resistance it is another
End is connected with the second end of the rectification circuit；
3rd voltage-stabiliser tube, the negative electrode of the 3rd voltage-stabiliser tube is connected with the other end of the 4th resistance；
6th resistance, one end of the 6th resistance is connected with the anode of the 3rd voltage-stabiliser tube, the 6th resistance it is another
End is connected with the other end of the 5th resistance.
9. protection circuit according to claim 8, it is characterised in that the control module includes：
Second switch device, the control end of the second switch device is connected with the anode of the 3rd voltage-stabiliser tube, and described second
The first end of switching device as the control module output end, the second end of the second switch device and the described 6th electricity
The other end connection of resistance.
10. protection circuit according to claim 9, it is characterised in that second driver element includes：
7th resistance, one end of the 7th resistance is connected with the other end of the 4th resistance, the 7th resistance it is another
End is connected with the output end of the control module；
8th resistance, one end of the 8th resistance connects with one end of the 4th resistance and the source electrode of the first PMOS respectively
Connect；
9th resistance, one end of the 9th resistance connects with the other end of the 8th resistance and the grid of the first PMOS respectively
Connect；
3rd switching device, the control end of the 3rd switching device is connected with the output end of the control module, and the described 3rd
The first end of switching device is connected with the other end of the 9th resistance, second end and described second of the 3rd switching device
The second end connection of switching device.
11. protection circuits according to claim 10, it is characterised in that also include：
Second filtration module, one end of second filtration module is connected with the grid of first PMOS, second filter
The other end of ripple module is connected with the second end of the 3rd switching device.
12. a kind of chargers, it is characterised in that including any one of rectification circuit, capacitance module and claim 1-11
Protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710204093.3A CN106787052A (en) | 2017-03-30 | 2017-03-30 | A kind of protection circuit and charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710204093.3A CN106787052A (en) | 2017-03-30 | 2017-03-30 | A kind of protection circuit and charger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106787052A true CN106787052A (en) | 2017-05-31 |
Family
ID=58965706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710204093.3A Pending CN106787052A (en) | 2017-03-30 | 2017-03-30 | A kind of protection circuit and charger |
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| Country | Link |
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| CN (1) | CN106787052A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111756019A (en) * | 2019-03-29 | 2020-10-09 | 苏州市纽莱克电子科技有限公司 | Charge-discharge current detection and protection circuit |
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Application publication date: 20170531 |