CN209642342U - Overvoltage crowbar and electronic equipment - Google Patents
Overvoltage crowbar and electronic equipment Download PDFInfo
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- CN209642342U CN209642342U CN201920242847.9U CN201920242847U CN209642342U CN 209642342 U CN209642342 U CN 209642342U CN 201920242847 U CN201920242847 U CN 201920242847U CN 209642342 U CN209642342 U CN 209642342U
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Abstract
It includes charging module, switch module and overvoltage protective module that the utility model, which provides a kind of overvoltage crowbar and electronic equipment, overvoltage crowbar,；Charging module includes charging input end and charge control end；Overvoltage protective module includes protection input terminal and protection control terminal；It protects input terminal to connect charging input end, protects control terminal connection switch module, switch module connects charge control end；Protection input terminal is used to detect the voltage of charging input end, and protection control terminal is used to control signal according to the voltage output of protection input terminal detection, and control signal is used for the on or off of control switch module, to realize the closing or opening of charging module.Overvoltage crowbar and electronic equipment provided by the utility model, overvoltage protective module and switch module do not increase the line impedance of charging module, realize and carry out overvoltage protection to low pressure charging circuit, improve the security performance of charging circuit.
Description
[technical field]
The utility model relates to over-voltage protection technology field more particularly to a kind of overvoltage crowbars and electronic equipment.
[background technique]
Currently, in the electronic device, low-voltage, high-current charging is the highest scheme of charge efficiency.Low-voltage, high-current charging side
Case specifically refers to directly be carried out filling electricity to battery by metal-oxide-semiconductor by charger, in charger voltage by power network fluctuation, output
In the case that voltage also fluctuates, the voltage for being directly entered battery can be more than the safe range of battery, cause cells burst, even
The risk of explosion, there are great security risks.
In existing electronic equipment, over-voltage charge protection mode is by an overvoltage protector of connecting on charge path
Part solves, and this mode is directed to high-voltage charging, will not have an impact to charge efficiency, however, in low pressure charging, if series connection
One over-voltage protector, the impedance on charge path will increase, and reduce charge efficiency, also, over-voltage protector need it is full
The high conveyance capacity of foot, it is more difficult to realize.
In consideration of it, it is really necessary to provide one kind novel overvoltage crowbar and electronic equipment to overcome drawbacks described above.
[utility model content]
The purpose of the utility model is to provide one kind can effectively avoid excessively high voltage for electronic equipment charging, avoids electricity
Sub- equipment or the line impedance for burning, improving security performance and not increasing charging module of circuit element are not influencing to charge
In the case where efficiency, the overvoltage crowbar and electronic equipment that overvoltage protection is carried out to low pressure charging circuit are realized.
To achieve the goals above, the utility model provides a kind of overvoltage crowbar, including charging module, switch module
And overvoltage protective module；The charging module includes charging input end and charge control end；The overvoltage protective module includes protecting
Protect input terminal and protection control terminal；The protection input terminal connects the charging input end, described in the protection control terminal connects
Switch module, the switch module connect the charge control end；The protection input terminal is for detecting the charging input end
Voltage, the protection control terminal is used to control signal according to the voltage output of the protection input terminal detection, and the control is believed
Number for controlling the on or off of the switch module, to realize the closing or opening of the charging module.
In a preferred embodiment, the charging module includes the first metal-oxide-semiconductor and the second metal-oxide-semiconductor, the first MOS
The charging input end is drawn in the pole D of pipe, and the pole S of first metal-oxide-semiconductor connects the pole S of second metal-oxide-semiconductor, and described second
Charging output end is drawn in the pole D of metal-oxide-semiconductor, and the charging output end is used to connect the battery of electronic equipment to be charged, and described the
The pole G of one metal-oxide-semiconductor connects the pole G of the pole G of second metal-oxide-semiconductor and first metal-oxide-semiconductor and the pole G of second metal-oxide-semiconductor and draws
The charge control end out；The overvoltage protective module includes OVP chip, and the OVP chip includes OVP input pin and detection
Pin is controlled, the OVP input pin draws the protection input terminal, and the detection control pin draws the protection control
End；The switch module includes third metal-oxide-semiconductor, and the pole D of the third metal-oxide-semiconductor connects the charge control end, the 3rd MOS
The pole S of pipe connects the protection control terminal, and the pole G of the third metal-oxide-semiconductor connects CPU module, and the CPU module is for controlling institute
State the voltage of the pole G of third metal-oxide-semiconductor.
In a preferred embodiment, the OVP chip further includes OVP output pin, the OVP output pin connection
PMI module, the PMI module are used to detect the information of voltage of the charging input end and are transferred to the information of voltage described
CPU module, the CPU module control the voltage of the pole G of the third metal-oxide-semiconductor according to the information of voltage.
In a preferred embodiment, the OVP output pin of the OVP chip is also connected with electric capacity of voltage regulation.
In a preferred embodiment, the pole S of the third metal-oxide-semiconductor is also connected with PMU module, and the PMU module is used for
The pole S for the third metal-oxide-semiconductor provides upper pull-up voltage.
In a preferred embodiment, pull-up resistor is also connected between the pole S and PMU module of the third metal-oxide-semiconductor.
In a preferred embodiment, the OVP input pin of the OVP chip is also connected with the first divider resistance and
Two divider resistances.
In a preferred embodiment, the first peace in parallel is also connected between the pole G with the pole S of first metal-oxide-semiconductor
Impedance and the first safe capacitor.
In a preferred embodiment, the second peace in parallel is also connected between the pole G with the pole S of second metal-oxide-semiconductor
Impedance and the second safe capacitor.
The utility model also provides a kind of electronic equipment, including the electricity of overvoltage protection described in above-mentioned any one embodiment
Road.
Compared with the prior art, overvoltage crowbar and electronic equipment provided by the utility model, can effectively avoid
Excessively high voltage is electronic equipment charging, avoids burning for electronic equipment or circuit element, improves security performance；Also,
Overvoltage protective module connects charging input end, and overvoltage protective module controls the closure or disconnected of charging module by switch module
It opens, overvoltage protective module and switch module do not increase the line impedance of charging module, real in the case where not influencing charge efficiency
Show and overvoltage protection is carried out to low pressure charging circuit, has improved the security performance of charging circuit.
To enable the above objects, features, and advantages of utility model to be clearer and more comprehensible, it is preferable that the utility model is cited below particularly
Embodiment, and cooperate appended attached drawing, it is described in detail below.
[Detailed description of the invention]
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
Attached drawing be briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore should not be by
Regard the restriction to range as, for those of ordinary skill in the art, without creative efforts, may be used also
To obtain other relevant attached drawings according to these attached drawings.
Fig. 1 is the functional block diagram of overvoltage crowbar provided by the utility model；
Fig. 2 is the circuit diagram of overvoltage crowbar provided by the utility model；
Fig. 3 is the circuit diagram of the charging module and switch module in Fig. 2；
Fig. 4 is the circuit diagram of the overvoltage protective module in Fig. 2.
[specific embodiment]
Below in conjunction with attached drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out clear
Chu is fully described by, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole realities
Apply example.The component of the utility model embodiment being usually described and illustrated herein in the accompanying drawings can be come with a variety of different configurations
Arrangement and design.Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit below
The range of claimed invention, but it is merely representative of the selected embodiment of the utility model.Based on the utility model
Embodiment, those skilled in the art's every other embodiment obtained without making creative work, all
Belong to the range of the utility model protection.
Referring to Fig. 1, Fig. 1 is the functional block diagram of overvoltage crowbar 100 provided by the utility model.The utility model mentions
The overvoltage crowbar 100 of confession includes charging module 10, switch module 20 and overvoltage protective module 30.
Charging module 10 includes charging input end 11 and charge control end 12；Overvoltage protective module 30 includes protection input terminal
31 and protection control terminal 32；It protects input terminal 31 to connect charging input end 11, protects 32 connection switch module 20 of control terminal, switch
Module 20 connects charge control end 12.Protection input terminal 31 is used to detect the voltage of charging input end 11, and protection control terminal 32 is used
Signal is controlled in the voltage output detected according to protection input terminal 31, the control signal is used for the conducting of control switch module 20
Or shutdown, to realize the closing or opening of charging module 10.
Overvoltage crowbar 100 provided by the utility model increases switch module 20 and overvoltage protective module 30, and fills
Electric module 10 includes charge control end 12, and the protection input terminal 31 of overvoltage protective module 30 connects charging input end 11 and protection is defeated
Enter the voltage of 31 detection charging input end 11 of end, protection control terminal 32 controls letter according to the voltage output that protection input terminal 31 detects
Number, and 32 connection switch module 20 of control terminal is protected, switch module 20 connects charge control end 12, the control signal control of output
The on or off of switch module 20, to realize the closing or opening of charging module 10.Specifically, pre- in overvoltage protective module 30
If charging voltage rating, the size for the voltage rating that charges can be according to the battery parameter of actual electronic equipment and filling for charger
Electrical parameter and set and adjust, when the input voltage of charging input end 11 be less than or equal to charging voltage rating when, protection input
End 31 detects that the voltage of charging input end 11 meets the charge requirement of electronic equipment, then protects the control of the output conducting of control terminal 32
Signal processed, control switch module 20 is connected, to realize the closure of charging module 10, i.e., charging module 10 works normally, for electricity
Sub- equipment power supply；And when the input voltage of charging input end 11 is greater than charging voltage rating, protection input terminal 31, which detects, to be filled
The voltage of electrical input 11 is unsatisfactory for the charge requirement of electronic equipment, then protects the control signal of the output shutdown of control terminal 32, control
Switch module 20 processed turns off, to realize the disconnection of charging module 10, i.e., charging module 10 stops working, and is no longer electronic equipment
Power supply avoids excessively high voltage as electronic equipment charging, reduces security risk.
Overvoltage crowbar 100 provided by the utility model can effectively avoid excessively high voltage from filling for electronic equipment
Electricity avoids burning for electronic equipment or circuit element, improves security performance；Also, the connection charging of overvoltage protective module 30
Input terminal 11, overvoltage protective module 30 control the closing or opening of charging module 10, overvoltage protection mould by switch module 20
Block 30 and switch module 20 do not increase the line impedance of charging module 10, in the case where not influencing charge efficiency, realize pair
Low pressure charging circuit carries out overvoltage protection, improves the security performance of charging circuit.
Referring to Figure 2 together, Fig. 3 and Fig. 4, charging module 10 include the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2, the first MOS
Charging input end 11 is drawn in the pole D of pipe Q1, and the pole S of the first metal-oxide-semiconductor Q1 connects the pole S of the second metal-oxide-semiconductor Q2, the D of the second metal-oxide-semiconductor Q2
Charging output end 13 is drawn in pole, and charging output end 13 is used to connect the battery 14 of electronic equipment to be charged, the first metal-oxide-semiconductor Q1's
The pole G connects the pole G of the second metal-oxide-semiconductor Q2 and charge control end 12 is drawn in the pole G of the first metal-oxide-semiconductor Q1 and the pole G of the second metal-oxide-semiconductor Q2.
Overvoltage protective module 30 includes that OVP chip U1, OVP chip U1 includes OVP input pin VBUSIN and detection control
Pin nACOK, OVP input pin VBUSIN draws protection input terminal 31, and detection control pin nACOK draws the protection control
End 32.
Switch module 20 includes third metal-oxide-semiconductor Q3, and the pole D of third metal-oxide-semiconductor Q3 connects charge control end 12, third metal-oxide-semiconductor
The pole the S connection protection control terminal 32 of Q3, the pole G connection CPU (Central Processing Unit, the center of third metal-oxide-semiconductor Q3
Processor) module 21, the voltage of G pole of the CPU module 21 for controlling third metal-oxide-semiconductor Q3.
Overvoltage crowbar 100 provided by the utility model is filled when the input voltage of charging input end 11 is less than or equal to
When electric voltage rating, OVP input pin VBUSIN detects that the voltage of charging input end 11 meets the charge requirement of electronic equipment,
The control signal of control pin nACOK output conducting is then detected, the control signal is low level signal, i.e. third metal-oxide-semiconductor Q3
S extremely low level signal, at this point, CPU module 21 control third metal-oxide-semiconductor Q3 the pole G voltage be high level signal, third
Metal-oxide-semiconductor Q3 conducting, so that the current potential of the pole D of third metal-oxide-semiconductor Q3 be dragged down, i.e. the pole G of the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2
The current potential of the pole G be pulled low, the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2 are both turned on, and then realize the closure of charging module 10,
I.e. charging module 10 works normally, and is power electronic equipment；And when the input voltage of charging input end 11 is greater than the specified electricity that charges
When pressure, OVP input pin VBUSIN detects that the voltage of charging input end 11 is unsatisfactory for the charge requirement of electronic equipment, then detects
The control signal of pin nACOK output shutdown is controlled, the control signal is high level signal, i.e. the S of third metal-oxide-semiconductor Q3 is extremely
High level signal, at this point, the voltage that CPU module 21 controls the pole G of third metal-oxide-semiconductor Q3 is low level signal, third metal-oxide-semiconductor Q3 is closed
Disconnected, the pole D and the pole S of the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2 are in identical current potential, the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2
It is turned off, and then realizes the disconnection of charging module 10, i.e., charging module 10 stops working, and is no longer power electronic equipment, keeps away
Exempt from excessively high voltage as electronic equipment charging, reduces security risk.Specifically, the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2 are
P-type metal-oxide-semiconductor, third metal-oxide-semiconductor Q3 are N-type metal-oxide-semiconductor.
Further, OVP chip U1 further includes OVP output pin VBUSOUT, OVP output pin VBUSOUT connection PMI
(Power Management IC, power management IC) module 33, PMI module 33 are used to detect the voltage letter of charging input end 11
It ceases and the information of voltage is transferred to CPU module 21, CPU module 21 controls the G of third metal-oxide-semiconductor Q3 according to the information of voltage
The voltage of pole.When the input voltage of charging input end 11 is less than or equal to charging voltage rating, CPU module 21 controls third
The voltage of the pole G of metal-oxide-semiconductor Q3 is high level signal, and then realizes the closure of charging module 10；And when charging input end 11
When input voltage is greater than charging voltage rating, the voltage that CPU module 21 controls the pole G of third metal-oxide-semiconductor Q3 is low level signal, into
And realize the disconnection of charging module 10.
Specifically, the OVP output pin VBUSOUT of OVP chip U1 is also connected with electric capacity of voltage regulation C1, it is preferable that pressure stabilizing electricity
The size for holding C1 is 0.1 μ F, and electric capacity of voltage regulation C1 is used to stablize the voltage of OVP output pin VBUSOUT detection.
Further, the pole S of third metal-oxide-semiconductor Q3 is also connected with PMU (Power Management Unit, power management list
Member) module 22, PMU module 22 is for providing upper pull-up voltage for the pole S of third metal-oxide-semiconductor Q3.Specifically, the upper pull-up voltage is big
Small is 1.8V, is also connected with pull-up resistor R1 between the pole S and PMU module 22 of third metal-oxide-semiconductor Q3, it is preferable that pull-up resistor R1
Resistance value be 10k, the effect of pull-up resistor R1 are as follows: do not inputted and OVP output pin in OVP input pin VBUSIN
In the case that VBUSOUT is not exported, guarantee the S extremely high level of third metal-oxide-semiconductor Q3, it is ensured that third metal-oxide-semiconductor Q3 is off
State, i.e. the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2 are turned off, and then realize the disconnection of charging module 10.It is appreciated that this
PMI module 33 and PMU module 22 in utility model are able to carry out signal transmitting with CPU module 21, that is, pass through wired or nothing
The corresponding control signal of line communication control corresponding module output.
Specifically, the OVP input pin VBUSIN of OVP chip U1 is also connected with the partial pressure electricity of the first divider resistance R2 and second
The pre- of overvoltage protective module 30 can be adjusted by adjusting the resistance value of the first divider resistance R2 and the second divider resistance R3 by hindering R3
If charging voltage rating size, in present embodiment, the resistance value of the first divider resistance R2 is 100k, the second divider resistance R3
Resistance value be 12k.
Overvoltage crowbar 100 provided by the utility model is also connected in parallel between the pole G and the pole S of first metal-oxide-semiconductor Q1
The safe capacitor C2 of the first safe Resistance R4 and first safe capacitor C2, the first safe Resistance R4 and first cooperate, can
The safety processing of circuit is carried out, such as switch noise inhibiting and over-voltage absorb, specifically, the resistance value of the first safe Resistance R4 is
The size of 10k, the first safe capacitor C2 are 1000pF；In parallel second is also connected between the pole G of second metal-oxide-semiconductor Q2 and the pole S
The safe capacitor C3 of safe Resistance R5 and second safe capacitor C3, the second safe Resistance R5 and second cooperates, and is able to carry out electricity
The safety on road is handled, such as switch noise inhibiting and over-voltage absorb, specifically, the resistance value of the second safe Resistance R5 is 100k,
The size of second safe capacitor C3 is 1000pF.
In present embodiment, also connect between the pole D of third metal-oxide-semiconductor Q3 and the first metal-oxide-semiconductor Q1 and the pole G of the second metal-oxide-semiconductor Q2
It is connected to reserved resistance R6, it should be noted that in practical application, reserved resistance R6 can cancel.
The utility model also provides a kind of electronic equipment, and including the overvoltage crowbar 100 in above-described embodiment, electronics is set
Standby can be the intelligent terminals such as mobile phone, tablet computer, laptop.
Overvoltage crowbar 100 and electronic equipment provided by the utility model, can effectively avoid the excessively high voltage from being
Electronic equipment charging, avoids burning for electronic equipment or circuit element, improves security performance；Also, overvoltage protective module
30 connection charging input ends 11, overvoltage protective module 30 control the closing or opening of charging module 10 by switch module 20,
Overvoltage protective module 30 and switch module 20 do not increase the line impedance of charging module 10, the case where not influencing charge efficiency
Under, it realizes and overvoltage protection is carried out to low pressure charging circuit, improve the security performance of charging circuit.
The foregoing is merely the embodiments of the present invention, and therefore it does not limit the scope of the patent of the utility model, all
It is equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, directly or indirectly uses
In other related technical areas, it is also included in the patent protection scope of the utility model.
Claims (10)
1. a kind of overvoltage crowbar, which is characterized in that including charging module, switch module and overvoltage protective module；It is described to fill
Electric module includes charging input end and charge control end；The overvoltage protective module includes protection input terminal and protection control terminal；
The protection input terminal connects the charging input end, and the protection control terminal connects the switch module, the switch module
Connect the charge control end；
The protection input terminal is used to detect the voltage of the charging input end, and the protection control terminal is used for according to the protection
The voltage output of input terminal detection controls signal, and the control signal is used to control the on or off of the switch module, with
Realize the closing or opening of the charging module.
2. overvoltage crowbar as described in claim 1, which is characterized in that the charging module includes the first metal-oxide-semiconductor and the
The charging input end, the pole the S connection described second of first metal-oxide-semiconductor are drawn in two metal-oxide-semiconductors, the pole D of first metal-oxide-semiconductor
Charging output end is drawn in the pole S of metal-oxide-semiconductor, the pole D of second metal-oxide-semiconductor, and the charging output end is for connecting electricity to be charged
The battery of sub- equipment, the pole G of first metal-oxide-semiconductor connect the pole G and the institute of the pole G of second metal-oxide-semiconductor and first metal-oxide-semiconductor
Draw the charge control end in the pole G for stating the second metal-oxide-semiconductor；
The overvoltage protective module includes OVP chip, and the OVP chip includes OVP input pin and detection controls pin, described
OVP input pin draws the protection input terminal, and the detection control pin draws the protection control terminal；
The switch module includes third metal-oxide-semiconductor, and the pole D of the third metal-oxide-semiconductor connects the charge control end, the third
The pole S of metal-oxide-semiconductor connects the protection control terminal, and the pole G of the third metal-oxide-semiconductor connects CPU module, and the CPU module is for controlling
Make the voltage of the pole G of the third metal-oxide-semiconductor.
3. overvoltage crowbar as claimed in claim 2, which is characterized in that the OVP chip further includes OVP output pin,
The OVP output pin connects PMI module, and the PMI module is used to detect the information of voltage of the charging input end and by institute
It states information of voltage and is transferred to the CPU module, the CPU module controls the pole G of the third metal-oxide-semiconductor according to the information of voltage
Voltage.
4. overvoltage crowbar as claimed in claim 3, which is characterized in that the OVP output pin of the OVP chip is also connected with
There is electric capacity of voltage regulation.
5. overvoltage crowbar as claimed in claim 3, which is characterized in that the pole S of the third metal-oxide-semiconductor is also connected with PMU mould
Block, the PMU module are used to provide upper pull-up voltage for the pole S of the third metal-oxide-semiconductor.
6. overvoltage crowbar as claimed in claim 5, which is characterized in that the pole S of the third metal-oxide-semiconductor and PMU module it
Between be also connected with pull-up resistor.
7. overvoltage crowbar as claimed in claim 2, which is characterized in that the OVP input pin of the OVP chip is also connected with
There are the first divider resistance and the second divider resistance.
8. overvoltage crowbar as claimed in claim 2, which is characterized in that between the pole G and the pole S of first metal-oxide-semiconductor also
It is connected with the first safe Resistance and the first safe capacitor in parallel.
9. overvoltage crowbar as claimed in claim 8, which is characterized in that between the pole G and the pole S of second metal-oxide-semiconductor also
It is connected with the second safe Resistance and the second safe capacitor in parallel.
10. a kind of electronic equipment, which is characterized in that including overvoltage crowbar as described in any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920242847.9U CN209642342U (en) | 2019-02-26 | 2019-02-26 | Overvoltage crowbar and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920242847.9U CN209642342U (en) | 2019-02-26 | 2019-02-26 | Overvoltage crowbar and electronic equipment |
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| Publication Number | Publication Date |
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| CN209642342U true CN209642342U (en) | 2019-11-15 |
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ID=68494492
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| CN201920242847.9U Active CN209642342U (en) | 2019-02-26 | 2019-02-26 | Overvoltage crowbar and electronic equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111200274A (en) * | 2020-01-15 | 2020-05-26 | 上海闻泰信息技术有限公司 | Variable threshold overvoltage protection circuit, electronic equipment and method |
| CN114520497A (en) * | 2022-04-21 | 2022-05-20 | 浙江地芯引力科技有限公司 | Overvoltage protection circuit, method, quick-charging wire, chip and storage medium |
-
2019
- 2019-02-26 CN CN201920242847.9U patent/CN209642342U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111200274A (en) * | 2020-01-15 | 2020-05-26 | 上海闻泰信息技术有限公司 | Variable threshold overvoltage protection circuit, electronic equipment and method |
| CN111200274B (en) * | 2020-01-15 | 2022-07-12 | 上海闻泰信息技术有限公司 | Variable threshold overvoltage protection circuit, electronic equipment and method |
| CN114520497A (en) * | 2022-04-21 | 2022-05-20 | 浙江地芯引力科技有限公司 | Overvoltage protection circuit, method, quick-charging wire, chip and storage medium |
| CN114520497B (en) * | 2022-04-21 | 2022-07-19 | 浙江地芯引力科技有限公司 | Overvoltage protection circuit, method, quick charging wire, chip and storage medium |
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