CN208971123U - A kind of line under-voltage overvoltage crowbar and protective device - Google Patents
A kind of line under-voltage overvoltage crowbar and protective device Download PDFInfo
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- CN208971123U CN208971123U CN201821748962.5U CN201821748962U CN208971123U CN 208971123 U CN208971123 U CN 208971123U CN 201821748962 U CN201821748962 U CN 201821748962U CN 208971123 U CN208971123 U CN 208971123U
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Abstract
The utility model discloses a kind of line under-voltage overvoltage crowbar and protective device, the line under-voltage overvoltage crowbar includes under-voltage protective module, overvoltage protective module and power switching module；The under-voltage protective module is connect with power input and power switching module, is sampled for the supply voltage to the power input, and is controlled the power switching module when sampled voltage is less than the first predeterminated voltage and disconnected；The overvoltage protective module is connect with power input and power switching module, is disconnected for controlling the power switching module when the supply voltage of power input is greater than the second predeterminated voltage；The power switching module is also connect with power output end, and for controlling the output state of supply voltage, when power switching module disconnects, the power output end stops exporting the supply voltage.Enable and chip and power supply are protected in supply voltage exception, while also improving the service life and safety of electronic product.
Description
Technical field
The utility model relates to power protection field, in particular to a kind of line under-voltage overvoltage crowbar and protection
Device.
Background technique
Currently, the power supply that power unit provides in electronic product is typically all to be directly output to chip, without corresponding
Circuit is protected, chip can be caused to burn out when the voltage that power supply provides is higher, so that electronic product is not available；Or power supply
Chip is also working when the low voltage of offer, so that power unit overload abnormal work is to burning out power unit,
Electronic product can be available yet.
Thus the prior art could be improved and improve.
Utility model content
Place in view of above-mentioned deficiencies of the prior art, the purpose of this utility model is to provide a kind of line under-voltage over-voltage guarantors
Protection circuit and protective device are enabled by newly increasing under-voltage protective module and overvoltage protective module in supply voltage exception
Chip and power supply are protected, will not or the relatively low burning phenomenon that causes chip or power supply higher because of supply voltage, simultaneously
Also improve the service life and safety of electronic product.
In order to achieve the above object, the utility model takes following technical scheme:
A kind of line under-voltage overvoltage crowbar comprising under-voltage protective module, overvoltage protective module and power switch mould
Block；The under-voltage protective module is connect with power input and power switching module, for the power supply to the power input
Voltage is sampled, and is controlled the power switching module when sampled voltage is less than the first predeterminated voltage and disconnected；The over-voltage
Protective module is connect with power input and power switching module, and it is default to be greater than second for the supply voltage when power input
The power switching module is controlled when voltage to disconnect；The power switching module is also connect with power output end, for controlling electricity
The output state of source voltage, when power switching module disconnects, the power output end stops exporting the supply voltage.
In the line under-voltage overvoltage crowbar, the under-voltage protective module includes partial pressure unit, the first pressure stabilizing list
Member and switch control unit；The partial pressure unit is connect with power input and switch control unit, for defeated to the power supply
The supply voltage for entering end is sampled and exports sampled voltage to switch control unit；First voltage regulation unit and power input
End is connected with switch control unit, for exporting the first predeterminated voltage to switch control list after carrying out steady pressure treatment to supply voltage
Member；The switch control unit is also connect with power switching module, for the sampled voltage and the first predeterminated voltage
Size, outputs control signals to the power switching module when the sampled voltage is less than the first predeterminated voltage, described in control
Power switching module disconnects.
In the line under-voltage overvoltage crowbar, the overvoltage protective module includes that the second voltage regulation unit and filtering are single
Member；Second voltage regulation unit is connect with power input and power switching module, for detecting the power supply electricity of power input
Pressure outputs control signals to the power switching module when the supply voltage is greater than the pressure stabilizing value of the second voltage regulation unit, controls
The power switching module is made to disconnect；The filter unit connects second voltage regulation unit, is used for filtering clutter signal.
In the line under-voltage overvoltage crowbar, the under-voltage protective module further includes under-voltage prompt unit, described
Under-voltage prompt unit is connect with switch control unit, corresponding under-voltage for exporting when switch control unit exports control signal
Prompt information.
In the line under-voltage overvoltage crowbar, the overvoltage protective module further includes over-voltage prompt unit, described
Over-voltage prompt unit is connect with the second voltage regulation unit, for exporting corresponding over-voltage when the second voltage regulation unit exports control signal
Prompt information.
In the line under-voltage overvoltage crowbar, the partial pressure unit includes first resistor and second resistance, described
First voltage regulation unit includes 3rd resistor, first capacitor and the first zener diode, and the switch control unit includes the 4th electricity
Resistance, the first triode and first diode；One end of the first resistor connects power input, the first resistor it is another
End is grounded by second resistance, and the base stage of the first triode is also connected by the 4th resistance；One end of the 3rd resistor connects
Power input, it is steady that the other end of the 3rd resistor connects the emitter of the first triode, one end of first capacitor and first
Press the cathode of diode；The anode of the other end of the first capacitor and the first zener diode is grounded；One or three pole
The collector of pipe connects the anode of the under-voltage prompt unit and first diode；Described in the cathode connection of the first diode
Power switching module.
In the line under-voltage overvoltage crowbar, the under-voltage prompt unit includes the 5th resistance and first luminous two
Pole pipe；One end of 5th resistance connects the collector of the first triode, the first hair of other end connection of the 5th resistance
The anode of optical diode, the cathode ground connection of first light emitting diode.
In the line under-voltage overvoltage crowbar, second voltage regulation unit includes the second zener diode, the 6th
Resistance and the second diode, the filter unit include the second capacitor；The cathode connection power supply of second zener diode is defeated
Enter end, one end of anode the 6th resistance of connection of second zener diode；The other end connection second of 6th resistance
The anode of diode, one end of the second capacitor and over-voltage prompt unit；The cathode of second diode connects the power supply and opens
Close module；The other end of second capacitor is grounded.
In the line under-voltage overvoltage crowbar, the over-voltage prompt unit includes the 7th resistance and second luminous two
Pole pipe；One end of 7th resistance connects the other end of the 6th resistance, and the other end connection second of the 7th resistance shines
The anode of diode；The cathode of second light emitting diode is grounded.
A kind of line under-voltage over-pressure safety device, including pcb board are provided with power supply as described above on the pcb board and owe
Press through voltage protection circuit.
Compared to the prior art, described in line under-voltage overvoltage crowbar provided by the utility model and protective device
Line under-voltage overvoltage crowbar includes under-voltage protective module, overvoltage protective module and power switching module；The under-voltage protection
Module is connect with power input and power switching module, is sampled for the supply voltage to the power input, and
The power switching module is controlled when sampled voltage is less than the first predeterminated voltage to disconnect；The overvoltage protective module and power supply are defeated
Enter end to connect with power switching module, for controlling the electricity when the supply voltage of power input is greater than the second predeterminated voltage
Source switch module disconnects；The power switching module is also connect with power output end, for controlling the output state of supply voltage,
When power switching module disconnects, the power output end stops exporting the supply voltage.By newly increasing under-voltage protective module
And overvoltage protective module, enable and chip and power supply are protected in supply voltage exception, it will not be inclined because of supply voltage
The high or relatively low burning phenomenon for causing chip or power supply, while also improving the service life and safety of electronic product.
Detailed description of the invention
Fig. 1 is the structural block diagram of line under-voltage overvoltage crowbar provided by the utility model.
Fig. 2 is the circuit diagram of line under-voltage overvoltage crowbar provided by the utility model.
Specific embodiment
The disadvantages of may cause chip or power supply scaling loss extremely in view of supply voltage in the prior art, the mesh of the utility model
Be a kind of line under-voltage overvoltage crowbar and protective device are provided, by newly increasing under-voltage protective module and overvoltage protection
Module enables and protects in supply voltage exception to chip and power supply, will not be higher because of supply voltage or relatively low makes
At the burning phenomenon of chip or power supply, while also improving the service life and safety of electronic product.
To keep the purpose of this utility model, technical solution and effect clearer, clear, develop simultaneously implementation referring to the drawings
The utility model is further described in example.It should be appreciated that specific embodiment described herein is only practical to explain
It is novel, it is not used to limit the utility model.
Referring to Fig. 1, line under-voltage overvoltage crowbar provided by the utility model includes under-voltage protective module 10, over-voltage
Protective module 20 and power switching module 30, the under-voltage protective module 10 and power input POWER IN and power switch mould
Block 30 connects, and the overvoltage protective module 20 is connect with power input POWER IN and power switching module 30, the power supply
Switch module 30 is also connect with power output end POWER OUT；Wherein the under-voltage protective module 10 is for defeated to the power supply
Enter to hold the supply voltage of POWER IN to be sampled, and controls the power switch when sampled voltage is less than the first predeterminated voltage
Module 30 disconnects, and the overvoltage protective module 20 is used to be greater than the second default electricity when the supply voltage of power input POWER IN
The power switching module 30 is controlled when pressure to disconnect, the power switching module 30 is used to control the output state of supply voltage,
When power switching module 30 disconnects, the power output end POWER OUT stops exporting the supply voltage.
Pass through under-voltage protective module 10 and overvoltage protection in line under-voltage overvoltage crowbar i.e. provided by the utility model
Module 20 controls the on off operating mode of power switching module 30, so that under-voltage and overvoltage protection is realized, when the under-voltage feelings of generation
When condition, supply voltage is relatively low, and under-voltage protective module 10 is equally relatively low to the sampled voltage obtained after supply voltage sampling at this time, when
The disconnection of power switching module 30 is then controlled when sampled voltage is less than the first predeterminated voltage, so that power output end POWER OUT stops
Only output supply voltage is to back-end chip, wherein first predeterminated voltage according to the under-voltage protection value of current power and can be adopted
Sample ratio is set；And when overpressure situation occurs, supply voltage is higher, and overvoltage protective module 20 directly detects electricity at this time
The size of source voltage then controls power switching module 30 when supply voltage is greater than the second predeterminated voltage and disconnects, power output end
POWER OUT equally stops output supply voltage to back-end chip, i.e., described second predeterminated voltage can be directly disposed as current electricity
The overvoltage protection value of pressure, so that no matter supply voltage is higher or relatively low, can be to chip and power supply after electronic product is powered
It is protected, prevents chip or the phenomenon that power supply is burnt.
Specifically, referring to Figure 2 together, the under-voltage protective module 10 includes partial pressure unit 101, the first voltage regulation unit
102 and switch control unit 103, the partial pressure unit 101 and power input POWER IN and switch control unit 103 connect
It connects, first voltage regulation unit 102 is connect with power input POWER IN and switch control unit 103, the switch control
Unit 103 is also connect with power switching module 30；Wherein, the partial pressure unit 101 is used for the power input POWER
The supply voltage of IN is sampled and exports sampled voltage to switch control unit 103；First voltage regulation unit 102 for pair
POWER IN supply voltage exports the first predeterminated voltage to switch control unit 103 after carrying out steady pressure treatment；The switch control
Unit 103 is used for the size of the sampled voltage and the first predeterminated voltage, in the sampled voltage less than the first default electricity
The power switching module 30 is output control signals to when pressure, is controlled the power switching module 30 and is disconnected.
In the present embodiment, sampled by supply voltage of the partial pressure unit 101 to power input POWER IN
It obtains sampled voltage to control for subsequent under-voltage protection, and steady pressure treatment is carried out to supply voltage by the first voltage regulation unit 102
After export the first predeterminated voltage to switch control unit 103, i.e., the value of described first predeterminated voltage is the first voltage regulation unit 102
Pressure stabilizing value, judged by the size of the sampled voltage of switch control unit 103 and the first predeterminated voltage it is current whether
Under-voltage phenomenon has occurred, specifically outputs control signals to power switching module when the sampled voltage is less than the first predeterminated voltage
30, it controls the power switching module 30 and disconnects, supply voltage is inclined at this time for explanation when sampled voltage is less than the first predeterminated voltage
It is low, overload will cause to power supply if chip works on, may cause power supply and burn, therefore pass through the switch control
Unit 103 controls the power switching module 30 and disconnects, and stops output supply voltage to back-end chip, effectively increases power supply work
The safety and reliability of work.
Preferably, the under-voltage protective module 10 further includes under-voltage prompt unit 104, the under-voltage prompt unit 104 with
Switch control unit 103 connects, and the under-voltage prompt unit 104 is used for defeated when switch control unit 103 exports control signal
Corresponding under-voltage prompt information out, when it is implemented, not only passing through switch control when the supply voltage under-voltage phenomenon of too low generation
Unit 103 controls the power switching module 30 and disconnects, and exports corresponding under-voltage prompt simultaneously also by under-voltage prompt unit 104
Information needs to carry out troubleshooting processing, further ensures electronics so that it is abnormal to remind user's current power voltage to exist in time
The safety that product uses, the specific under-voltage prompt information can be buzzing or light information etc..
Further, the overvoltage protective module 20 include the second voltage regulation unit 201 and filter unit 202, described second
Voltage regulation unit 201 is connect with power input POWER IN and power switching module 30, and the filter unit 202 connects described
Two voltage regulation units 201, wherein second voltage regulation unit 201 is used to detect the supply voltage of power input POWER IN,
The supply voltage outputs control signals to the power switching module 30 when being greater than the pressure stabilizing value of the second voltage regulation unit 201, controls
It makes the power switching module 30 to disconnect, the filter unit 202 is used for filtering clutter signal.
In the present embodiment, the supply voltage is input to the second voltage regulation unit 201, if current supply voltage is greater than second
When the pressure stabilizing value of voltage regulation unit 201, the second voltage regulation unit 201 exports corresponding control signal to power switching module 30 at this time,
Power switching module 30 is controlled to disconnect, i.e., directly by the function of second voltage regulation unit 201 realization switch control, described the
The size of two predeterminated voltages is the pressure stabilizing value of the second voltage regulation unit 201, when supply voltage is greater than the pressure stabilizing value, illustrates to occur
Over-voltage phenomenon directly outputs control signals to power switching module 30 by second voltage regulation unit 201 and disconnects its and realizes over-voltage
Protection avoids that supply voltage excessively high the case where burning chip, electronic product is caused not to be available occurs, single simultaneously also by filtering
Member 202 filters the overvoltage protection that noise signal realizes more accurate stable.
Similarly, the overvoltage protective module 20 may also set up over-voltage prompt unit 203, the over-voltage prompt unit 203
It is connect with the second voltage regulation unit 201, for exporting corresponding over-voltage prompt letter when the second voltage regulation unit 201 exports control signal
Breath.I.e. when the excessively high generation over-voltage phenomenon of supply voltage, corresponding over-voltage prompt letter is equally exported by over-voltage prompt unit 203
Breath, to achieve the purpose that user's current power voltage is reminded to there is exception, the over-voltage prompt information can be buzzing or lamp
Optical information etc., the specific over-voltage prompt information and under-voltage prompt information may be configured as different types of prompt information or not
The prompt information of same parameter, such as buzzing information and light information is respectively adopted, or the light letter of different colours is respectively adopted
Breath etc., thus distinguish two kinds of supply voltage abnormal phenomenon prompt, enable a user to definitely know be currently occur
Over-voltage or under-voltage phenomenon.
Specifically, the partial pressure unit 101 includes first resistor R1 and second resistance R2, first voltage regulation unit 102
Including 3rd resistor R3, first capacitor C1 and the first zener diode ZD1, the switch control unit 103 includes the 4th resistance
R4, the first triode Q1 and first diode D1；One end of the first resistor R1 connects power input POWER IN, described
The other end of first resistor R1 is grounded by second resistance R2, also passes through the base stage of the 4th resistance R4 the first triode of connection Q1；
One end of the 3rd resistor R3 connects power input POWER IN, and the other end of the 3rd resistor R3 connects the one or three pole
The emitter of pipe Q1, one end of first capacitor C1 and the first zener diode ZD1 cathode；The other end of the first capacitor C1
It is grounded with the anode of the first zener diode ZD1；The collector of the first triode Q1 connects the under-voltage prompt unit
The anode of 104 and first diode D1；The cathode of the first diode D1 connects the power switching module 30, the present embodiment
In, the first triode Q1 is PNP type triode.
The under-voltage prompt unit 104 includes the 5th resistance R5 and the first Light-emitting diode LED 1；The 5th resistance R5
One end connect the collector of the first triode Q1, the other end of the 5th resistance R5 connects the first Light-emitting diode LED 1
Anode, the cathode ground connection of first Light-emitting diode LED 1.
Wherein, it is carried out by supply voltage of the first resistor R1 and second resistance R2 to power input POWER IN
It divides and obtains a sampled voltage, A level point V at the A point in Fig. 2AIt is first resistor R1 and second resistance R2 to input power
The size of the partial pressure value of POWER IN, the partial pressure value determines by the ratio of first resistor R1 and second resistance R2, can basis
The under-voltage protection value that current power needs is arranged the size of first resistor R1 and second resistance R2 and then adjusts the level of A point
Size；The 3rd resistor R3, first capacitor C1 and the first zener diode ZD1 play pressure stabilization function, and the F level point in Fig. 2 is
Size for the pressure stabilizing value of the first zener diode ZD1, the pressure stabilizing value determines by the first zener diode ZD1, such as first steady
Pressing diode ZD1 is the voltage-stabiliser tube of 3.6V, then the level of F point are as follows: VF=3.6V, the under-voltage guarantor that can be needed according to current power
Shield value selects the pressure stabilizing value of the first zener diode ZD1, but the pressure stabilizing value of the first zener diode ZD1 has to compare
The low purpose that just can reach under-voltage protection of the level of POWER IN, by comparing sampled point, that is, A point of input power POWER IN
Level and the F level point size of the first zener diode ZD1 realize the under-voltage protection of power supply, when F level point is higher than A point electricity
Usually the first triode Q1 is connected, H point high level, at this time controls output high-level control signal to power switching module 30
It is disconnected, and so that power output end POWER OUT is stopped output supply voltage, and the high-level control signal will also drive first
Light-emitting diode LED 1 is lighted, and under-voltage prompt is played the role of.
Further, second voltage regulation unit 201 includes the second zener diode ZD2, the 6th resistance R6 and the two or two
Pole pipe D2, the filter unit 202 include the second capacitor C2；The cathode of the second zener diode ZD2 connects power input
Hold POWER IN, one end of the 6th resistance R6 of anode connection of the second zener diode ZD2；The 6th resistance R6's is another
One end connects the anode of the second diode D2, one end of the second capacitor C2 and over-voltage prompt unit 203；The second diode D2
Cathode connect the power switching module 30；The other end of the second capacitor C2 is grounded.
The over-voltage prompt unit 203 includes the 7th resistance R7 and the second Light-emitting diode LED 2；The 7th resistance R7
One end connect the other end of the 6th resistance R6, the other end of the 7th resistance R7 is connecting the second Light-emitting diode LED 2 just
Pole；The cathode of second Light-emitting diode LED 2 is grounded.
When it is implemented, the second zener diode ZD2 and the 6th resistance R6 rise pressure stabilization functions, the second capacitor C2 rise filtering and
Remove noise, the second diode D2 is to prevent voltage from flowing backward, by by the P level point of input power POWER IN and the second pressure stabilizing two
The pressure stabilizing value of pole pipe ZD2, which is compared, reaches overvoltage protection purpose, and wherein P level point is the level value of POWER IN, P point and R1
Level between point is the pressure stabilizing value of the second zener diode ZD2, the size of the pressure stabilizing value by the second zener diode ZD2 Lai
It determines, such as: the second zener diode ZD2 is the voltage-stabiliser tube of 5.1V, then the level between P point and R1 point are as follows: VPR1=5.1V, can
Select the pressure stabilizing value of the second zener diode ZD2 with the overvoltage protection value needed according to current power, but the second pressure stabilizing two
The pressure stabilizing value of pole pipe ZD2 has to the level Gao Caike than POWER IN and plays the role of overvoltage protection, is carrying out overvoltage protection
When, when P level point is higher than the pressure stabilizing value of the second zener diode ZD2, the second zener diode ZD2 reverse breakdown, power supply leads to
Crossing the level after the second zener diode ZD2 and the 6th resistance R6 at R point is high level signal, passes through the two or two pole again later
Pipe D2 exports the high level signal to power switching module 30, equally controls the power switching module 30 and disconnects, thus real
The purpose of existing overvoltage protection.Equally, the high level signal that R is pointed out also lights the second Light-emitting diode LED 2 of driving, plays
The effect of prompt is pressed, first Light-emitting diode LED 1 and the second Light-emitting diode LED 2 are preferably luminous the two of different colours
Pole pipe plays the role of better fault cues to distinguish under-voltage prompt and over-voltage prompt.
Further, the power switching module 30 includes the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, the
Three capacitor C3, the second triode Q2 and metal-oxide-semiconductor M1；One end of the 8th resistance R8 connects the cathode of the first diode D1
With the cathode of the second diode D2, the other end of the 8th resistance R8 connects the base stage of the second triode Q2；Described 2nd 3
The emitter of pole pipe Q2 is grounded, and the collector of the second triode Q2 connects one end and the tenth resistance R10 of the 9th resistance R9
One end；Other end connection power input POWER IN of the 9th resistance R9, one end of third capacitor C3 and metal-oxide-semiconductor M1
Drain electrode, the tenth resistance R10 the other end connection third capacitor C3 the other end and metal-oxide-semiconductor M1 grid；The metal-oxide-semiconductor
The source electrode of M1 connects power output end POWER OUT, and in the present embodiment, the second triode Q2 is NPN type triode, described
Metal-oxide-semiconductor M1, which is that N-MOS is potent, to manage.
When it is implemented, providing bias voltage, the 9th resistance R9 and the tenth by the 8th resistance R8 for the second triode Q2
Resistance R10 provides bias voltage for the grid of metal-oxide-semiconductor M1, and third capacitor C3 mainly plays filtering and removal noise, carrying out
When under-voltage protection and overvoltage protection, when generation supply voltage is excessively high or too low, the power switching module 30 is received
The level of high-level control signal, i.e. I point is high level, and the second triode Q2 is connected at this time, so that N1 and N2 point low level,
Metal-oxide-semiconductor M1 is enabled to end, input power can not be flowed through source electrode by the drain electrode of metal-oxide-semiconductor M1 and be provided for power output end POWER OUT
Power supply stops output supply voltage to back-end chip at this time, play under-voltage and overvoltage protection, effective protection chip and power supply
It works normally.
For the course of work for more fully understanding line under-voltage overvoltage crowbar provided by the utility model, below in conjunction with figure
2, and overvoltage protection process under-voltage to the line under-voltage overvoltage crowbar is described in detail:
The under-voltage protective module 10 in specific application, when supply voltage be normal voltage when, the first resistor R1
It is that the base bias voltage i.e. A point voltage that the first triode Q1 is provided is higher than the first zener diode ZD1's with second resistance R2
Pressure stabilizing F point voltage, the first triode Q1 cut-off, H point is low level, and the first Light-emitting diode LED 1 does not work, and power supply is opened at this time
The I point closed in module 30 is also low level, cannot be that the second triode Q2 provides bias voltage therefore the by the 8th resistance R8
Two triode Q2 cut-off, while the 9th resistance R9 and the tenth resistance R10 provide bias voltage for the grid of N1 point and metal-oxide-semiconductor M1,
So that metal-oxide-semiconductor M1 is connected, drain electrode is opened with grid groove, and power input POWER IN flows through source electrode by the drain electrode of metal-oxide-semiconductor M1
Power supply is provided for POWER OUT.
When supply voltage is too low, the first resistor R1 and second resistance R2 are that the base stage that the first triode Q1 is provided is inclined
The pressure stabilizing F point voltage that voltage i.e. A point voltage is lower than the first zener diode ZD1, the first triode Q1 conducting are set, H point is high electricity
Flat, the first Light-emitting diode LED 1 is lighted, and the I point in power switching module 30 is also high level at this time, passes through the 8th resistance R8
There is provided bias voltage for the second triode Q2 is connected the second triode Q2, and the grid of N1 point and metal-oxide-semiconductor M1 are low electricity at this time
Flat, metal-oxide-semiconductor M1 cut-off, the channel between drain electrode and source electrode is closed, and power input POWER IN can not pass through the drain electrode of metal-oxide-semiconductor M1
It flows through source electrode and provides power supply for POWER OUT, achieve the purpose that under-voltage protection.
In specific application, when supply voltage is normal voltage, i.e., supply voltage is lower than the overvoltage protective module 20
When the pressure stabilizing value of the second zener diode ZD2, the second zener diode ZD2 cut-off, R point low level, the second light emitting diode
LED2 does not work, and the I point in power switching module 30 is also low level at this time, can not be that third pole pipe is mentioned by the 8th resistance R8
For bias voltage therefore the second triode Q2 cut-off, so that metal-oxide-semiconductor M1 is connected, drain electrode is opened with grid groove, and power supply is defeated
Enter POWER IN source electrode is flowed through by the drain electrode of metal-oxide-semiconductor M1 and provides power supply for POWER OUT.I.e. when supply voltage is in normal model
When enclosing, the under-voltage protective module 10 will not trigger the disconnection of power switching module 30 with overvoltage protective module 20, so that can be just
Supply voltage often is provided for back-end chip, guarantees the normal work of electronic product.
When supply voltage is excessively high, that is, when being higher than the pressure stabilizing value of the second zener diode ZD2, the second zener diode ZD2
Reverse breakdown, power supply are high level, the second light-emitting diodes by flowing through R point after the second zener diode ZD2 and the 6th resistance R6
Pipe LED2 is lighted, then provides high level to I point by the second diode D2, is provided by the 8th resistance R8 for the second triode Q2
The second triode Q2 is connected in bias voltage, and the N1 point voltage in power switching module 30 is low level, the grid of metal-oxide-semiconductor M1
(N2 point) is also low level, and metal-oxide-semiconductor M1 cut-off, draining can not lead to the channel closing between source electrode, power input POWER IN
The drain electrode for crossing metal-oxide-semiconductor M1 flows through source electrode and provides power supply for POWER OUT, achievees the purpose that overvoltage protection.
Therefore line under-voltage overvoltage crowbar provided by the utility model, it is under-voltage when POWER IN is normal voltage
Protective module 10 and overvoltage protective module 20 not trigger protection function, so that metal-oxide-semiconductor M1 is connected, POWER IN is to POWER
OUT provides power supply；When the low voltage of POWER IN, under-voltage protective module 10 then exports high level signal to power switch mould
Block 30, so that metal-oxide-semiconductor M1 ends, POWER IN can not provide power supply to POWER OUT；When the voltage of POWER IN is higher,
The equally output high level signal of overvoltage protective module 20 is to power switching module 30, so that metal-oxide-semiconductor M1 ends, POWER IN can not
Power supply is provided to POWER OUT, i.e., the described line under-voltage overvoltage crowbar is while guaranteeing the normal power supply of chip, effectively
Under-voltage and overvoltage protection is provided, chip and power supply, and electricity can be protected in the case of supply voltage is too low or too high
Road is simple, reliable and stable, at low cost, has good application value.
Based on above-mentioned line under-voltage overvoltage crowbar, the utility model correspondingly provides a kind of line under-voltage overvoltage protection
Device comprising pcb board is provided with line under-voltage overvoltage crowbar as described above on the pcb board, due to right above
The line under-voltage overvoltage crowbar is described in detail, and is not described further herein.
In conclusion the power supply is owed in line under-voltage overvoltage crowbar provided by the utility model and protective device
Pressing through voltage protection circuit includes under-voltage protective module, overvoltage protective module and power switching module；The under-voltage protective module with
Power input is connected with power switching module, is sampled for the supply voltage to the power input, and is being sampled
The power switching module is controlled when voltage is less than the first predeterminated voltage to disconnect；The overvoltage protective module and power input and
Power switching module connection, for controlling the power switch when the supply voltage of power input is greater than the second predeterminated voltage
Module disconnects；The power switching module is also connect with power output end, for controlling the output state of supply voltage, works as power supply
Switch module power output end stopping output supply voltage when disconnecting.By newly increasing under-voltage protective module and over-voltage
Protective module enables and protects in supply voltage exception to chip and power supply, will not be higher or inclined because of supply voltage
The low burning phenomenon for causing chip or power supply, while also improving the service life and safety of electronic product.
It is understood that for those of ordinary skills, can with technical solution according to the present utility model and
The design of its utility model is subject to equivalent substitution or change, and all these changes or replacement all should belong to appended by the utility model
Scope of protection of the claims.
Claims (10)
1. a kind of line under-voltage overvoltage crowbar, which is characterized in that including under-voltage protective module, overvoltage protective module and power supply
Switch module；The under-voltage protective module is connect with power input and power switching module, for the power input
Supply voltage sampled, and control when sampled voltage is less than the first predeterminated voltage the power switching module and disconnect；Institute
It states overvoltage protective module to connect with power input and power switching module, is greater than for the supply voltage when power input
The power switching module is controlled when two predeterminated voltages to disconnect；The power switching module is also connect with power output end, is used for
The output state for controlling supply voltage, when power switching module disconnects, the power output end stops exporting the power supply electricity
Pressure.
2. line under-voltage overvoltage crowbar according to claim 1, which is characterized in that the under-voltage protective module includes
Partial pressure unit, the first voltage regulation unit and switch control unit；The partial pressure unit and power input and switch control unit connect
It connects, sampled for the supply voltage to the power input and exports sampled voltage to switch control unit；Described
One voltage regulation unit is connect with power input and switch control unit, for exporting first after carrying out steady pressure treatment to supply voltage
Predeterminated voltage is to switch control unit；The switch control unit is also connect with power switching module, is used for the sampling
The size of voltage and the first predeterminated voltage outputs control signals to the electricity when the sampled voltage is less than the first predeterminated voltage
Source switch module controls the power switching module and disconnects.
3. line under-voltage overvoltage crowbar according to claim 1, which is characterized in that the overvoltage protective module includes
Second voltage regulation unit and filter unit；Second voltage regulation unit is connect with power input and power switching module, for examining
The supply voltage for surveying power input is output control signals to when the supply voltage is greater than the pressure stabilizing value of the second voltage regulation unit
The power switching module controls the power switching module and disconnects；The filter unit connects second voltage regulation unit, uses
In filtering clutter signal.
4. line under-voltage overvoltage crowbar according to claim 2, which is characterized in that the under-voltage protective module is also wrapped
Under-voltage prompt unit is included, the under-voltage prompt unit is connect with switch control unit, for when switch control unit output control
Corresponding under-voltage prompt information is exported when signal.
5. line under-voltage overvoltage crowbar according to claim 3, which is characterized in that the overvoltage protective module also wraps
Over-voltage prompt unit is included, the over-voltage prompt unit is connect with the second voltage regulation unit, for when the output control of the second voltage regulation unit
Corresponding over-voltage prompt information is exported when signal.
6. line under-voltage overvoltage crowbar according to claim 4, which is characterized in that the partial pressure unit includes first
Resistance and second resistance, first voltage regulation unit include 3rd resistor, first capacitor and the first zener diode, the switch
Control unit includes the 4th resistance, the first triode and first diode；One end of the first resistor connects power input,
The other end of the first resistor is grounded by second resistance, and the base stage of the first triode is also connected by the 4th resistance；It is described
One end of 3rd resistor connects power input, and the other end of the 3rd resistor connects the emitter of the first triode, first
The cathode of one end of capacitor and the first zener diode；The anode of the other end of the first capacitor and the first zener diode is
Ground connection；The collector of first triode connects the anode of the under-voltage prompt unit and first diode；Described 1st
The cathode of pole pipe connects the power switching module.
7. line under-voltage overvoltage crowbar according to claim 6, which is characterized in that the under-voltage prompt unit includes
5th resistance and the first light emitting diode；One end of 5th resistance connects the collector of the first triode, the 5th electricity
The other end of resistance connects the anode of the first light emitting diode, the cathode ground connection of first light emitting diode.
8. line under-voltage overvoltage crowbar according to claim 5, which is characterized in that second voltage regulation unit includes
Second zener diode, the 6th resistance and the second diode, the filter unit include the second capacitor；Second pressure stabilizing, two pole
The cathode of pipe connects power input, one end of anode the 6th resistance of connection of second zener diode；6th electricity
The other end of resistance connects the anode of the second diode, one end of the second capacitor and over-voltage prompt unit；Second diode
Cathode connects the power switching module；The other end of second capacitor is grounded.
9. line under-voltage overvoltage crowbar according to claim 8, which is characterized in that the over-voltage prompt unit includes
7th resistance and the second light emitting diode；One end of 7th resistance connects the other end of the 6th resistance, the 7th resistance
The other end connect the second light emitting diode anode；The cathode of second light emitting diode is grounded.
10. a kind of line under-voltage over-pressure safety device, including pcb board, which is characterized in that be arranged on the pcb board just like right
It is required that line under-voltage overvoltage crowbar described in 1-9 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821748962.5U CN208971123U (en) | 2018-10-26 | 2018-10-26 | A kind of line under-voltage overvoltage crowbar and protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821748962.5U CN208971123U (en) | 2018-10-26 | 2018-10-26 | A kind of line under-voltage overvoltage crowbar and protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208971123U true CN208971123U (en) | 2019-06-11 |
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ID=66764459
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821748962.5U Expired - Fee Related CN208971123U (en) | 2018-10-26 | 2018-10-26 | A kind of line under-voltage overvoltage crowbar and protective device |
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| Country | Link |
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| CN (1) | CN208971123U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111030047A (en) * | 2019-12-27 | 2020-04-17 | 广东高标电子科技有限公司 | Controller circuit of motor and high-voltage prevention method thereof |
| CN112117740A (en) * | 2020-08-21 | 2020-12-22 | 广州亚美智造科技有限公司 | Under-voltage protection trigger circuit, under-voltage protection device and power supply system |
| CN112653115A (en) * | 2020-12-18 | 2021-04-13 | 同方电子科技有限公司 | Multi-module parallel input circuit for preventing reverse connection, overvoltage and undervoltage protection and isolating switch |
| WO2023070783A1 (en) * | 2021-10-27 | 2023-05-04 | 深圳市爱图仕影像器材有限公司 | Power source circuit, working method for power source circuit, and illumination apparatus |
-
2018
- 2018-10-26 CN CN201821748962.5U patent/CN208971123U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111030047A (en) * | 2019-12-27 | 2020-04-17 | 广东高标电子科技有限公司 | Controller circuit of motor and high-voltage prevention method thereof |
| CN112117740A (en) * | 2020-08-21 | 2020-12-22 | 广州亚美智造科技有限公司 | Under-voltage protection trigger circuit, under-voltage protection device and power supply system |
| CN112117740B (en) * | 2020-08-21 | 2023-09-15 | 亚美智联数据科技有限公司 | Under-voltage protection trigger circuit, under-voltage protection device and power supply system |
| CN112653115A (en) * | 2020-12-18 | 2021-04-13 | 同方电子科技有限公司 | Multi-module parallel input circuit for preventing reverse connection, overvoltage and undervoltage protection and isolating switch |
| WO2023070783A1 (en) * | 2021-10-27 | 2023-05-04 | 深圳市爱图仕影像器材有限公司 | Power source circuit, working method for power source circuit, and illumination apparatus |
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Granted publication date: 20190611 Termination date: 20211026 |