CN209134046U - A kind of protection circuit and electronic equipment - Google Patents
A kind of protection circuit and electronic equipment Download PDFInfo
- Publication number
- CN209134046U CN209134046U CN201821459902.1U CN201821459902U CN209134046U CN 209134046 U CN209134046 U CN 209134046U CN 201821459902 U CN201821459902 U CN 201821459902U CN 209134046 U CN209134046 U CN 209134046U
- Authority
- CN
- China
- Prior art keywords
- circuit
- voltage
- input terminal
- comparator
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to electric prospection technical fields; more particularly to a kind of protection circuit and electronic equipment; it include: overvoltage crowbar; including the first sample circuit; for sampling the external power supply signal; to generate first voltage, the overvoltage crowbar is used to generate overvoltage protection signal when the first voltage is greater than preset reference voltage；Under-voltage protecting circuit, including the second sample circuit, for sampling the external power supply signal, to generate second voltage, the under-voltage protecting circuit is used to generate UVP signal when the second voltage is less than the preset reference voltage；Driving circuit is connect with the overvoltage crowbar and the under-voltage protecting circuit respectively, for generating driving signal according to the overvoltage protection signal or the UVP signal；Switching circuit is connect with the driving circuit, for limiting electric current and flowing into load according to the driving signal, to play the role of protecting household electrical appliance.
Description
Technical field
The utility model relates to electric prospection technical fields, more particularly to a kind of protection circuit and electronic equipment.
Background technique
With the fast development of China's scientific and technological level, the continuous improvement of living standards of the people, household electrical appliance also by
High-grade consumer is gradually converted into people's lives necessity.
The excessive use of household electrical appliance, also to the power supply facilities in China, more stringent requirements are proposed, especially some old
City and remote rural area, power supply facilities relatively lag behind, and it is unstable to be easy to appear supply voltage, and supply voltage is excessively high or mistake
When low, household electrical appliance is caused to can not work normally and damage.
Utility model content
One purpose of the utility model embodiment is intended to provide a kind of protection circuit and electronic equipment, solves current household electric
Device is since input voltage is unstable, the technical issues of being easily damaged.
In order to solve the above technical problems, the utility model embodiment the following technical schemes are provided:
In a first aspect, the utility model embodiment provides a kind of protection circuit, comprising: overvoltage crowbar, including first
Sample circuit, for sampling external power supply signal, to generate first voltage, the overvoltage crowbar is used in first electricity
When pressure is greater than preset reference voltage, overvoltage protection signal is generated；Under-voltage protecting circuit, including the second sample circuit, for sampling
The external power supply signal, to generate second voltage, the under-voltage protecting circuit is used to be less than in the second voltage described pre-
If when reference voltage, generating UVP signal；Driving circuit, it is electric with the overvoltage crowbar and the under-voltage protection respectively
Road connection, for generating driving signal according to the overvoltage protection signal or the UVP signal；Switching circuit, with institute
Driving circuit connection is stated, for electric current being limited and flowing into load according to the driving signal.
Preferably, the overvoltage crowbar further include: the first comparison circuit, including the first inverting input terminal, first are together
Phase input terminal and the first output end, first inverting input terminal is for being applied the first voltage, and described first the same as mutually defeated
Enter end for being applied the preset reference voltage, first output end is for exporting the overvoltage protection signal.
Preferably, the under-voltage protecting circuit further include: the second comparison circuit, including the second inverting input terminal, second are together
Phase input terminal and second output terminal, for second non-inverting input terminal for being applied the second voltage, second reverse phase is defeated
Enter end for being applied the preset reference voltage, the second output terminal is for exporting the UVP signal.
Preferably, first sample circuit includes first resistor, and the first resistor includes that first input end, third are defeated
Outlet and the first sliding end, first sliding end are connected to the first inverting input terminal of first comparison circuit.
Preferably, first comparison circuit includes first comparator and first diode, and the of the first comparator
One inverting input terminal is connected to the first sliding end of the first resistor, and the first output end of the first comparator is connected to institute
State first diode.
Preferably, second sample circuit includes second resistance, and the second resistance includes the second input terminal, the 4th defeated
Outlet and the second sliding end, second sliding end are connected to the second non-inverting input terminal of second comparison circuit.
Preferably, second comparison circuit includes the second comparator and the second diode, and the of second comparator
Two noninverting inputs are connected to the second sliding end of the second resistance, and the second output terminal of second comparator is connected to institute
State the second diode.
Preferably, the driving circuit includes: charging circuit, including 3rd resistor and first capacitor, the 3rd resistor
Input terminal be connected to power supply, the output end of the 3rd resistor is connected to the anode of the first capacitor, described first
The cathode of capacitor is connected to ground, for providing tertiary voltage for the driving circuit；Third comparison circuit, including the same phase of third
Input terminal, third inverting input terminal, the 5th output end, the third non-inverting input terminal is for being applied the preset reference electricity
Pressure, the inverting input terminal is for being applied the tertiary voltage, and the 5th output end is for exporting the driving signal；The
Four comparison circuits, including the 4th non-inverting input terminal, the 4th inverting input terminal, the 6th output end, the 4th non-inverting input terminal are used
In being applied the preset reference voltage, for the 4th inverting input terminal for being applied the tertiary voltage, the described 6th is defeated
Outlet is for exporting the driving signal.
Preferably, the third comparison circuit includes: third comparator and third diode, and the of the third comparator
Three non-inverting input terminals are connected to the first non-inverting input terminal of the first comparator, and the 5th output end of the third comparator connects
It is connected to the third diode；4th comparison circuit includes: the 4th comparator and the 4th diode, the 4th comparator
The 4th non-inverting input terminal be connected to the first non-inverting input terminal of the first comparator, the 6th output of the 4th comparator
End is connected to the 4th diode.
Second aspect, the utility model embodiment provide a kind of electronic equipment, comprising: shell；And
Protection circuit as described above, the protection circuit are set in the shell.
Compared with prior art, the utility model embodiment has the beneficial effect that by providing a kind of protection circuit and electricity
Sub- equipment, comprising: overvoltage crowbar, including the first sample circuit, for sampling the external power supply signal, to generate first
Voltage, the overvoltage crowbar are used to generate overvoltage protection signal when the first voltage is greater than preset reference voltage；It owes
Voltage protection circuit, including the second sample circuit, it is described under-voltage to generate second voltage for sampling the external power supply signal
Circuit is protected to be used to generate UVP signal when the second voltage is less than the preset reference voltage；Driving circuit, point
It is not connect with the overvoltage crowbar and the under-voltage protecting circuit, for according to the overvoltage protection signal or described under-voltage
Signal is protected, driving signal is generated；Switching circuit is connect with the driving circuit, for according to the driving signal, limitation electricity
Stream flows into load, when input voltage signal is higher or lower than preset reference voltage, generates overvoltage protection signal or under-voltage protection
Signal, driving circuit generate driving signal according to the overvoltage protection signal or UVP signal of generation, are that work is in disconnection
State avoids electric current from flowing into load, to play the role of protecting household electrical appliance.
Detailed description of the invention
One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys
The bright restriction not constituted to embodiment, the element in attached drawing with same reference numbers label are expressed as similar element, remove
Non- to have special statement, composition does not limit the figure in attached drawing.
Fig. 1 is a kind of functional block diagram for protecting circuit provided by the embodiment of the utility model；
Fig. 2 is a kind of structural schematic diagram for protecting circuit provided by the embodiment of the utility model；
Fig. 3 is the structural schematic diagram of another protection circuit provided by the embodiment of the utility model；
Fig. 4 is the structural schematic diagram of a kind of electronic equipment provided by the embodiment of the utility model.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only to explain this
Utility model is not used to limit the utility model.
Protection circuit provided by the embodiment of the utility model can be applied to the household electrical appliance of any suitable type, can solve
When certainly unstable due to supply voltage, the technical issues of causing household electrical appliance to damage.
Fig. 1 and Fig. 2 are please referred to, Fig. 1 is a kind of functional block diagram for protecting circuit provided by the embodiment of the utility model；Fig. 2
It is a kind of structural schematic diagram for protecting circuit provided by the embodiment of the utility model.
As depicted in figs. 1 and 2, protection circuit 100 includes: current rectifying and wave filtering circuit 10, overvoltage crowbar 20, under-voltage protection
Circuit 30, bleeder circuit 40, driving circuit 50, switching circuit 60, filter circuit 70 and indicating circuit 80.
Current rectifying and wave filtering circuit 10 includes: the second capacitor, the 4th resistance and the 5th diode, the input of the 5th diode
End is connected to one end of power supply, and the output end of the 5th diode is connected to the input terminal of the 4th resistance, and the described 4th
The output end of resistance is connected to the anode of second capacitor, and the cathode of second capacitor is connected to ground.Wherein, described whole
The input terminal of stream filter circuit 10 is connected to power supply, and the output end of the current rectifying and wave filtering circuit 10 is connected to the over-voltage and protects
The input terminal of the input terminal of protection circuit 20 and the under-voltage protecting circuit 30.
Overvoltage crowbar 20, for generating overvoltage protection signal when external power supply signal is greater than preset reference voltage,
The overvoltage crowbar 20 includes: the first sample circuit and the first comparison circuit.
First sample circuit is for acquiring the external power supply signal, to generate first voltage；Specifically, the mistake
Voltage protection circuit 20 is used to generate overvoltage protection signal when the first voltage is greater than the preset reference voltage, wherein the
One sample circuit includes first resistor, and the first resistor is slide rheostat, and first resistor includes: first input end, third
Output end and the first sliding end, for generating the first voltage.
First comparison circuit includes: the first inverting input terminal, the first non-inverting input terminal and the first output end, and described
One inverting input terminal is for being applied the first voltage, and first non-inverting input terminal is for being applied the preset reference electricity
Pressure, first output end is for exporting the overvoltage protection signal.
Specifically, the first comparison circuit includes first comparator and first diode, and the first of the first comparator is anti-
Phase input terminal is connected to the first sliding end of the first resistor, and the first output end of the first comparator is connected to described
The input terminal of one diode.
Under-voltage protecting circuit 30 is used to generate under-voltage protection letter when the external power supply signal is less than preset reference voltage
Number, the under-voltage protecting circuit 30 includes the second sample circuit and the second comparison circuit.
Second sample circuit is for sampling the external power supply signal, to generate second voltage；Specifically, described to owe
Voltage protection circuit 30 is used to generate UVP signal when the second voltage is less than the preset reference voltage.Wherein,
Two sample circuits include second resistance, and the second resistance includes: the second input terminal, the 4th output end and the second sliding end, are used
In the generation second voltage.
Second comparison circuit, including the second inverting input terminal, the second non-inverting input terminal and second output terminal, described
Two non-inverting input terminals are for being applied the second voltage, and second inverting input terminal is for being applied the preset reference electricity
Pressure, the second output terminal is for exporting the UVP signal.
Specifically, second comparison circuit includes the second comparator and the second diode, and the of second comparator
Two non-inverting input terminals are connected to the second sliding end of the second resistance, and the second output terminal of second comparator is connected to institute
State the second diode.
The input terminal of the input terminal of the overvoltage crowbar 20 and the under-voltage protecting circuit 30 is all connected to described point
The output end of volt circuit 40.
Bleeder circuit 40 includes the first light emitting diode, the 4th resistance and the 5th resistance, is used to provide the described overvoltage protection
Preset reference voltage needed for circuit 20 and under-voltage protecting circuit 30.
The input terminal of first light emitting diode is connected to power supply, the output end institute of first light emitting diode
The input terminal of the 4th resistance is stated, the output end of the 4th resistance is connected to the first non-inverting input terminal of the first comparator,
The input terminal of 5th resistance is connected to the second inverting input terminal of second comparator, the output end of the 5th resistance
It is connected to ground.
The input terminal of the driving circuit 50 be connected to the output end of the overvoltage crowbar 20 with it is described under-voltage
The output end for protecting circuit 30, for generating driving signal according to the overvoltage protection signal or the UVP signal.
The driving circuit 50 includes charging circuit, third comparison circuit and the 4th comparison circuit, and the charging circuit is used
It charges in the third comparison circuit and the 4th comparison circuit.
The charging circuit includes 3rd resistor and first capacitor, and the input terminal of the 3rd resistor is connected to power supply electricity
Source, the output end of the 3rd resistor are connected to the anode of the first capacitor, and the cathode of the first capacitor is connected to ground,
For providing tertiary voltage for the driving circuit 50.
Third comparison circuit, is connected to the charging circuit, including third non-inverting input terminal, third inverting input terminal, and
Five output ends, the third non-inverting input terminal is for being applied the preset reference voltage, and the inverting input terminal is for being applied
Add the tertiary voltage, the 5th output end is for exporting the driving signal.
Specifically, the third comparison circuit includes third comparator and third diode, and the of the third comparator
Three non-inverting input terminals are connected to the first non-inverting input terminal of the first comparator, and the 5th output end of the third comparator connects
It is connected to the third diode,
4th comparison circuit, is connected to the charging circuit, including the 4th non-inverting input terminal, the 4th inverting input terminal, and
Six output ends, for being applied the preset reference voltage, the 4th inverting input terminal is used for the 4th non-inverting input terminal
It is applied the tertiary voltage, the 6th output end is for exporting the driving signal.
Specifically, the 4th comparison circuit includes: the 4th comparator and the 4th diode, and the of the 4th comparator
Four non-inverting input terminals are connected to the first non-inverting input terminal of the first comparator, and the 6th output end of the 4th comparator connects
It is connected to the 4th diode.
Switching circuit 60 is connect with the driving circuit 50, for according to the driving signal, limitation electric current to flow through negative
It carries.
In the present embodiment, the switching circuit 60 is relay.The relay is a kind of electric control device, it has
Control system (also known as input circuit) and by control system (also known as output loop), it can realize input circuit and output loop
Circuit isolation, the magnetic force that signal transmitting is generated by coil, therefore there is preferable interference and insulation ability.
Specifically, the relay includes two important components of coil and contact sets, when the driving circuit 50 not
When output drive signal, the electric current flows through the relay, and the normally opened contact closure of the coil conducting, the relay is defeated
Circuit is connected out, and when 50 output drive signal of driving circuit, the electric current does not flow through the relay, and the coil is not
The normally opened contact of conducting, the relay disconnects, and the circuit does not turn on.
Filter circuit 70, it is in parallel with the switching circuit 60, it is not damaged for protective switch circuit 60, the filtered electrical
Road 70 includes third capacitor, and the anode of the third capacitor is connected to one end of the power supply, and the cathode of the third capacitor connects
It is connected to the driving circuit 50.
Indicating circuit 80, the input terminal of the indicating circuit 80 are connected to the output end of the driving circuit 50, the finger
Show that the output end of circuit 80 is connected to ground, for indicating the working condition of the switching circuit 80 according to the driving signal.
The indicating circuit 80 includes the 6th resistance and the second light emitting diode, and the input terminal of the 6th resistance is connected to
The output end of the output end of the driving circuit 50, the 6th resistance is connected to the input terminal of second light emitting diode,
The output end of the second lighting electrode pipe is connected to ground.
It is understood that above-mentioned first comparator, the second comparator, third comparator, the 4th comparator are put for operation
Big device, model LM324.
Referring to Fig. 3, above-mentioned first resistor is RP1, second resistance RP2, first comparator IC2A, first diode
For VD2, the second comparator is IC2B, and the second diode is VD3, and third comparator is IC2C, and third diode is VD4, the 4th
Comparator is IC2D, and the 4th diode is VD5,3rd resistor R4, first capacitor C4, and the second capacitor is C3, the 4th resistance
R1, the 5th diode be VD1, the first light emitting diode be LED1, the 4th resistance be R2, the 5th resistance be R3, relay K,
Third capacitor is C5, and the 6th resistance is R5, and the second light emitting diode is LED2.
Protect the working principle of circuit as follows:
As shown in figure 3, protector circuit accesses power grid when power input voltage is normal voltage (180-240VAC),
Capacitor C4 is charged by R4, and since capacitor C4 has just enter into charged state, the voltage of C4 anode is extremely low, IC2C, IC2D anti-phase input
Voltage is lower than non-inverting input terminal voltage, and IC2C and IC2D export high level, the cut-off of diode VD4, VD5 reverse phase, and relay K is in
The current supply circuit end of open-circuit condition, CZ is switched on, at this time IC2A, and the homophase input voltage of IC2B is higher than reverse inter-input-ing voltage,
IC2A, IC2B export high level, diode VD2 and VD3 reverse phase cut-off, with the raising of capacitor C4 charging voltage, IC2C, IC2D
Reverse inter-input-ing voltage be higher than IC2C, the in-phase voltage of IC2D, IC2C and IC2D export low-voltage, VD4, VD5 conducting, at this time after
Electric appliance K forming circuit, relay K in an ON state, connect, and electric power supply is normal by the current supply circuit of CZ.
When power input voltage is lower than 180VAC, that is, under-voltage condition, alternating voltage is by R1, after the partial pressure of RP1,
The reverse side of IC2A is inputted, the voltage of the in-phase end of IC2A is higher than reverse side, IC2A input high level, and diode VD2 ends, separately
Outer some alternating voltages pass through R1, and the in-phase end of IC2B is inputted after the partial pressure of RP2, and the voltage of the in-phase end of IC2B is lower than reverse side
Voltage, IC2B export low level, diode VD3 conducting, and capacitor C4 is discharged by VD3, and the voltage of C4 reduces, at this time IC2C,
The reverse side voltage of IC2D is lower than in-phase end voltage, and IC2C and IC2D export high level, and diode VD4, VD5 reverse phase is ended, after
The circuit electric appliance K disconnects, and relay is in open-circuit condition, and the current supply circuit of CZ disconnects, and provides under-voltage guarantor for AC-input voltage
Shield；
When power input voltage is greater than 240VAC, that is, overvoltage condition, alternating voltage is by R1, after the partial pressure of RP2
The in-phase end of IC2B is inputted, the voltage of the in-phase end of IC2B is higher than reverse side voltage, and IC2B exports high level, and diode VD3 is anti-
Phase cuts mesh, and in addition alternating voltage after the partial pressure of RP1, inputs the reverse side of IC2A, the voltage of the reverse side of IC2A by R1 all the way
Higher than in-phase end, IC2A input low level, diode VD2 reverse phase is connected, and capacitor C4 is discharged by VD2, and the voltage of C4 reduces, this
When IC2C, the reverse side voltage of IC2D is lower than in-phase end voltage, and IC2C and IC2D export high level, diode VD4, VD5 reverse phase
Cut-off, the circuit relay K disconnect, and relay is in open-circuit condition, and the current supply circuit of CZ is disconnected, provided for AC-input voltage
Overvoltage protection；
After city power recovery is normal (180-240VAC), IC2B exports high level, the cut-off of VD3 reverse phase, and capacitor C4 passes through R4
Charging, voltage slowly increases, IC2C, and IC2D reverse side voltage is higher than in-phase end voltage, and IC2C, IC2D export low level, VD4,
The conducting of VD5 reverse phase, the circuit relay K are connected, and relay recovery on-state, CZ current supply circuit is connected, and household electrical appliance restore just
Normal working condition realizes voltage and works normally self-recovering function.
The utility model has the following beneficial effects: by providing a kind of protection circuit, comprising: overvoltage crowbar, including the
One sample circuit, for sampling the external power supply signal, to generate first voltage, the overvoltage crowbar is used for described
When first voltage is greater than preset reference voltage, overvoltage protection signal is generated；Under-voltage protecting circuit, including the second sample circuit are used
In sampling the external power supply signal, to generate second voltage, the under-voltage protecting circuit in the second voltage for being less than
When the preset reference voltage, UVP signal is generated；Driving circuit, respectively with the overvoltage crowbar and described under-voltage
Circuit connection is protected, for generating driving signal according to the overvoltage protection signal or the UVP signal；Switch electricity
Road is connect with the driving circuit, for limiting electric current and flowing into load, when input voltage signal height according to the driving signal
In or when being lower than preset reference voltage, generate overvoltage protection signal or UVP signal, driving circuit is according to the over-voltage of generation
It protects signal or UVP signal to generate driving signal, is that work is in an off state, electric current is avoided to flow into load, to rise
To the effect of protection household electrical appliance.
Referring to Fig. 4, Fig. 4 is the structural schematic diagram of a kind of electronic equipment provided by the embodiment of the utility model.Such as Fig. 4 institute
Show, the electronic equipment 200 include shell 90 and and protection circuit 100 described in each embodiment as above, wherein the guarantor
Protection circuit 100 is set in the shell 90, and the electronic equipment 200 includes but is not limited to blender, refrigerator, micro-wave oven, washes
The household electronic products such as clothing machine.
To sum up, the electronic equipment 200, can be to avoid relay when input voltage is higher or lower than preset reference voltage
The case where working on, being malfunctioned so as to cause the load of electronic equipment 200.Meanwhile by overvoltage crowbar 20, under-voltage guarantor
50 co- controlling relay of protection circuit 30 and driving circuit, can be improved the safety of electronic equipment 200, so that electronic equipment
200 are not needing just can through safety certification require using other protection devices or more complicated Computer Aided Design, reduce
The design cost of the safeguard protection of electronic equipment 200 is conducive to the product competitiveness for improving electronic equipment 200.
Finally, it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations；
Under the thinking of the utility model, it can also be combined between the technical characteristic in above embodiments or different embodiments,
Step can be realized with random order, and there are many other variations of the different aspect of the utility model as described above, be
Simplicity, they do not provide in details；Although the utility model is described in detail with reference to the foregoing embodiments, this
The those of ordinary skill in field it is understood that it is still possible to modify the technical solutions described in the foregoing embodiments,
Or equivalent replacement of some of the technical features；And these are modified or replaceed, and do not make the sheet of corresponding technical solution
Matter is detached from the range of each embodiment technical solution of the application.
Claims (10)
1. a kind of protection circuit characterized by comprising
Overvoltage crowbar, including the first sample circuit, for sampling external power supply signal, to generate first voltage, the mistake
Voltage protection circuit is used for when the first voltage is greater than preset reference voltage, generates overvoltage protection signal, first sampling
Circuit includes: first resistor, and the first resistor includes first input end, third output end and the first sliding end；
Under-voltage protecting circuit, including the second sample circuit, for sampling the external power supply signal, to generate second voltage, institute
Under-voltage protecting circuit is stated for when the second voltage is less than the preset reference voltage, generation UVP signal to be described
Second sample circuit includes: second resistance, and the second resistance includes the second input terminal, the 4th output end and the second sliding end；
Driving circuit is connect with the overvoltage crowbar and the under-voltage protecting circuit respectively, for being protected according to the over-voltage
Signal or the UVP signal are protected, driving signal is generated；
Switching circuit is connect with the driving circuit, for limiting electric current and flowing into load according to the driving signal.
2. protection circuit according to claim 1, which is characterized in that the overvoltage crowbar further include:
First comparison circuit, including the first inverting input terminal, the first non-inverting input terminal and the first output end, first reverse phase are defeated
Enter end for being applied the first voltage, first non-inverting input terminal is described for being applied the preset reference voltage
First output end is for exporting the overvoltage protection signal.
3. protection circuit according to claim 2, which is characterized in that the under-voltage protecting circuit further include:
Second comparison circuit, including the second inverting input terminal, the second non-inverting input terminal and second output terminal, described second the same as mutually defeated
Enter end for being applied the second voltage, second inverting input terminal is described for being applied the preset reference voltage
Second output terminal is for exporting the UVP signal.
4. protection circuit according to claim 3, which is characterized in that first comparison circuit include first comparator with
First inverting input terminal of first diode, the first comparator is connected to the first sliding end of the first resistor, described
First output end of first comparator is connected to the first diode.
5. protection circuit according to claim 4, which is characterized in that second comparison circuit include the second comparator with
Second noninverting input of the second diode, second comparator is connected to the second sliding end of the second resistance, described
The second output terminal of second comparator is connected to second diode.
6. protection circuit according to claim 5, which is characterized in that the driving circuit includes:
Charging circuit, including 3rd resistor and first capacitor, the input terminal of the 3rd resistor are connected to power supply, and described
The output end of three resistance is connected to the anode of the first capacitor, and the cathode of the first capacitor is connected to ground, is used for as institute
It states driving circuit and tertiary voltage is provided；
Third comparison circuit, including third non-inverting input terminal, third inverting input terminal, the 5th output end, the third is the same as mutually defeated
Entering end for being applied the preset reference voltage, the inverting input terminal is for being applied the tertiary voltage, and the described 5th
Output end is for exporting the driving signal；
4th comparison circuit, including the 4th non-inverting input terminal, the 4th inverting input terminal, the 6th output end, the described 4th the same as mutually defeated
Enter end for being applied the preset reference voltage, the 4th inverting input terminal is described for being applied the tertiary voltage
6th output end is for exporting the driving signal.
7. protection circuit according to claim 6, which is characterized in that the third comparison circuit includes: third comparator
The first homophase input of the first comparator is connected to the third non-inverting input terminal of third diode, the third comparator
End, the 5th output end of the third comparator are connected to the third diode；
4th comparison circuit includes: the 4th comparator and the 4th diode, the 4th homophase input of the 4th comparator
End is connected to the first non-inverting input terminal of the first comparator, and the 6th output end of the 4th comparator is connected to described the
Four diodes.
8. protection circuit according to claim 1, which is characterized in that the protection circuit further include:
Bleeder circuit, including the first light emitting diode, the 4th resistance and the 5th resistance, be used to provide the described overvoltage crowbar and
Preset reference voltage needed for the under-voltage protecting circuit.
9. protection circuit according to claim 1, which is characterized in that the protection circuit further include:
Indicating circuit, the input terminal of the indicating circuit are connected to the output end of the driving circuit, the indicating circuit it is defeated
Outlet is connected to ground, for indicating the working condition of the switching circuit according to the driving signal.
10. a kind of electronic equipment characterized by comprising
Shell；And
Protection circuit as described in any one of claim 1 to 9, the protection circuit are set in the shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821459902.1U CN209134046U (en) | 2018-09-06 | 2018-09-06 | A kind of protection circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821459902.1U CN209134046U (en) | 2018-09-06 | 2018-09-06 | A kind of protection circuit and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209134046U true CN209134046U (en) | 2019-07-19 |
Family
ID=67229895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821459902.1U Active CN209134046U (en) | 2018-09-06 | 2018-09-06 | A kind of protection circuit and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209134046U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109088392A (en) * | 2018-09-06 | 2018-12-25 | 深圳和而泰智能控制股份有限公司 | A kind of protection circuit and electronic equipment |
-
2018
- 2018-09-06 CN CN201821459902.1U patent/CN209134046U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109088392A (en) * | 2018-09-06 | 2018-12-25 | 深圳和而泰智能控制股份有限公司 | A kind of protection circuit and electronic equipment |
| CN109088392B (en) * | 2018-09-06 | 2024-04-05 | 深圳和而泰智能控制股份有限公司 | Protection circuit and electronic equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204205552U (en) | The under-voltage over-voltage detection circuit of a kind of AC | |
| CN102540070B (en) | Control and detection circuit for four relays and detection method thereof | |
| CN204068405U (en) | The earth leakage protective DC power-supply system of a kind of band | |
| CN201509100U (en) | Electricity double-power device | |
| CN202260378U (en) | Leakage protector | |
| CN102638024B (en) | Interruption line protector | |
| CN103972862A (en) | Lightning protection type over-voltage and under-voltage protective device capable of automatically resetting | |
| CN209134046U (en) | A kind of protection circuit and electronic equipment | |
| CN104377647A (en) | Electric leakage protection circuit | |
| CN110416975A (en) | A kind of power protecting circuit and new-energy automobile | |
| CN203086328U (en) | Intelligent power grid terminal power input surge suppression circuit | |
| CN102545373A (en) | Dual power switching device for intelligent electronic equipment | |
| CN109088392A (en) | A kind of protection circuit and electronic equipment | |
| CN205583646U (en) | Earth leakage protection wall switch | |
| CN201663428U (en) | Automatic power-off type comprehensive protector | |
| CN208112265U (en) | charger protection circuit and charger | |
| CN207638631U (en) | A kind of IGBT protection circuit | |
| CN204205560U (en) | leakage protection circuit | |
| CN209250229U (en) | 380VAC protects circuit and charger | |
| CN208939572U (en) | A kind of three-phase ac contactor protection circuit of main circuit of frequency converter | |
| CN201985508U (en) | Zero line break protector and connecting structure thereof | |
| CN201985829U (en) | Switch control circuit | |
| CN205829133U (en) | Earth leakage protective device voltage protection | |
| CN202949096U (en) | Power socket with overvoltage protection function | |
| CN207200265U (en) | A kind of protective circuit of switch power source |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |