CN207782383U - Overload protecting circuit - Google Patents
Overload protecting circuit Download PDFInfo
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- CN207782383U CN207782383U CN201721926380.7U CN201721926380U CN207782383U CN 207782383 U CN207782383 U CN 207782383U CN 201721926380 U CN201721926380 U CN 201721926380U CN 207782383 U CN207782383 U CN 207782383U
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Abstract
The utility model is related to a kind of overload protecting circuits, including over-pressed time delayed turn-off module, voltage stabilizing delay switch module, low pressure shutdown module, power switching module and instantaneous high pressure suppression module；The electric point connection input power in the ends Vcc at the ends Vcc of over-pressed time delayed turn-off module, the ends Vcc of voltage stabilizing delay switch module, the ends Vcc of low pressure shutdown module, the ends Vcc of power switching module and instantaneous high pressure suppression module；The input terminal of the output termination voltage stabilizing delay switch module of over-pressed time delayed turn-off module；The input terminal of the output termination low pressure shutdown module of voltage stabilizing delay switch module；Low pressure turns off the input terminal of the output termination power switching module of module；The both ends of instantaneous high pressure suppression module connect the output end of the ends Vcc and power switching module respectively.Since foregoing circuit can not only realize overload protection, additionally it is possible to the control turned off into horizontal high voltage time delayed turn-off, voltage stabilizing delayed start-up and low pressure, and without using active chip so that circuit cost reduces, it is easy to accomplish.
Description
Technical field
The utility model is related to overload protecting circuits, more particularly to a kind of at low cost, electric with simple overload protection
Road.
Background technology
If electronic equipment is at work without good safeguard procedures, it is most likely that because of under-voltage, over-pressed, overcurrent, overheat, mistake
Connect, hot plug and lead to unit exception or damage.For overvoltage protection, is absorbed frequently with big electrolytic capacitor and transient state inhibits two poles
Pipe wrench system, but can only be effective to transient voltage, the time is slightly long, and capacitance both end voltage then increases, and electrochemical capacitor life is short, volume
Greatly；Transient Suppression Diode can be burnt, and also can add self-recovery fuse in front end to protect Transient Suppression Diode, but rear end is negative
Carry power it is larger when, need increase self-recovery fuse overcurrent, if at this point, want to Transient Suppression Diode implement protect,
Cost can be caused to increase, and technically difficult to realize.Currently, in over-pressed, under-voltage protection and having the technology of delay function, base
All it is to program to realize by active chip in sheet.Due to of high cost, it is difficult with, volume is big the shortcomings of cause it is not general.Or one
A little utility models easy to use, but function is not complete.
Utility model content
Based on this, it is necessary to provide it is a kind of it is at low cost, with simple overload protecting circuit.
A kind of overload protecting circuit, including over-pressed time delayed turn-off module, voltage stabilizing delay switch module, power switching module and
Instantaneous high pressure suppression module；
The ends Vcc of the overvoltage time delayed turn-off module, the ends Vcc of the voltage stabilizing delay switch module, the power switch
The ends Vcc of module and the ends Vcc of the instantaneous high pressure suppression module are all connected with input power；
The ground terminal of the overvoltage time delayed turn-off module, ground terminal, the power supply of the voltage stabilizing delay switch module are opened
The ground terminal for closing module connects power supply output ground terminal；The ground connection terminating load ground terminal of the instantaneous high pressure suppression module；
The output of the overvoltage time delayed turn-off module terminates the input terminal of the voltage stabilizing delay switch module；The voltage stabilizing is prolonged
When switch module output terminate the input terminal of the power switching module；The output terminating load of the power switching module
End；
The voltage stabilizing delay switch module includes first voltage conversion module and the first delays time to control module；First electricity
Pressure conversion module is used to for input power to be converted into the operating voltage needed for the first delays time to control module；In first electricity
When the voltage of conversion module output being pressed to be less than the threshold range of the operating voltage, the first delays time to control module is closed for exporting
Break signal；The power switching module is used for when receiving cut-off signals, and the connection between load and input power is made to disconnect；
When the voltage of first voltage conversion module output is in the threshold range of the operating voltage, described first prolongs
When control module for exporting open signal；The power switching module is used for when receiving open signal, makes load and input
Power supply connects；
The instantaneous high pressure suppression module is used to absorb the instantaneous high pressure in input power；
The overvoltage time delayed turn-off module is used to be higher than in the voltage of input power the high-order voltage limiting value of loaded work piece voltage
When, after postponing threshold time, export cut-off signals give the voltage stabilizing delay switch module, make the voltage stabilizing delay switch mould
Block exports cut-off signals, and then the connection between load and input power is made to disconnect.
The over-pressed time delayed turn-off module includes second voltage conversion module and the second delay in one of the embodiments,
Control module；
The second voltage conversion module is used to input power being converted into the electricity of the work needed for second delays time to control
Pressure；The voltage that the second delays time to control module is used to export in the second voltage conversion module is higher than the threshold of the operating voltage
It is worth range and exports cut-off signals after the delay threshold time to the voltage stabilizing delay switch module.
The power switching module includes VRM Voltage Regulator Module and switch tube module in one of the embodiments,；
The VRM Voltage Regulator Module is used to input power being adjusted to the operating voltage switched needed for tube module, described
Switch tube module is used to receive the open signal and cut-off signals of the voltage stabilizing delay switch module output, and according to open signal
And connecting or disconnecting between cut-off signals control load and input power.
The instantaneous high pressure suppression module includes diode (led) module in one of the embodiments,；
The anode of the diode (led) module connects load ground terminal, cathode connects input power.
The voltage threshold of the instantaneous high pressure suppression module is closed not less than the overvoltage delay in one of the embodiments,
The voltage threshold of disconnected module and close to the voltage threshold of the overvoltage time delayed turn-off module but load bear voltage range with
It is interior.
A kind of overload protecting circuit, including over-pressed time delayed turn-off module, voltage stabilizing delay switch module, power switching module and
Instantaneous high pressure suppression module；
The ends Vcc of the overvoltage time delayed turn-off module, the ends Vcc of the voltage stabilizing delay switch module, the instantaneous high pressure
The ends Vcc of suppression module are all connected with input power；
The ground terminal of the overvoltage time delayed turn-off module, ground terminal, the power supply of the voltage stabilizing delay switch module are opened
The ground terminal for closing module connects power supply output ground terminal；The ground connection terminating load ground terminal of the instantaneous high pressure suppression module；
The output of the overvoltage time delayed turn-off module terminates the input terminal of the voltage stabilizing delay switch module；The voltage stabilizing is prolonged
When switch module output terminate the input terminal of the power switching module；The output terminating load of the power switching module
End；
The voltage stabilizing delay switch module is used for when the voltage of input power is less than the low level voltage limiting value of voltage stabilizing threshold value, defeated
Go out cut-off signals；The power switching module is used for when receiving cut-off signals, keeps the connection between load and input power disconnected
It opens；When the voltage stabilizing delay switch module is additionally operable to the voltage of input power in voltage stabilizing threshold range, through delay threshold value when
Between after, export open signal；The power switching module is used for when receiving open signal, and load is made to be connect with input power；
The instantaneous high pressure suppression module is used to absorb the instantaneous high pressure in input power；
The overvoltage time delayed turn-off module is used for the high-order limit higher than loaded work piece voltage in the voltage for input power occur
When pressure value, after postponing threshold time, export cut-off signals to the voltage stabilizing delay switch module, so that voltage stabilizing delay is opened
It closes module and exports cut-off signals, and then the connection between load and input power is made to disconnect.
The voltage stabilizing delay switch module includes tertiary voltage conversion module and third delay in one of the embodiments,
Control module；
The tertiary voltage conversion module is used to for input power to be converted into the work needed for the third delays time to control module
Make voltage；When the voltage of tertiary voltage conversion module output is less than the threshold range of the operating voltage, the third is prolonged
When control module for exporting cut-off signals；The power switching module is used for when receiving cut-off signals, makes load and input
Connection between power supply disconnects；
When the voltage of tertiary voltage conversion module output is in the threshold range of the operating voltage, the third is prolonged
When control module for exporting open signal；The power switching module is used for when receiving open signal, makes load and input
Power supply connects.
The over-pressed time delayed turn-off module includes the 4th voltage transformation module and the 4th delay in one of the embodiments,
Control module；
4th voltage transformation module is used to input power being converted into the electricity of the work needed for the 4th delays time to control
Pressure；The voltage that the 4th delays time to control module is used to export in the 4th voltage transformation module is higher than the threshold of the operating voltage
It is worth range and exports cut-off signals after the delay threshold time to the voltage stabilizing delay switch module.
The power switching module includes field-effect tube Q4 in one of the embodiments, the grid of the field-effect tube Q4
Output end, the source electrode that pole connects the voltage stabilizing delay switch module connect power supply output ground terminal, drain electrode connects load ground terminal.
The instantaneous high pressure suppression module includes diode (led) module in one of the embodiments,；
The anode of the diode (led) module connects load ground terminal, cathode connects input power.
Above-mentioned overload protecting circuit include over-pressed time delayed turn-off module, voltage stabilizing delay switch module, power switching module and
Instantaneous high pressure suppression module；Voltage stabilizing delay switch module is used to be less than in the voltage of input power the low level voltage limiting value of voltage stabilizing threshold value
When, export cut-off signals；The power switching module is used for when receiving cut-off signals, makes instantaneous high pressure suppression module and load
Connection between input power disconnects；The voltage stabilizing delay switch module is additionally operable to the voltage of input power in voltage stabilizing threshold value
When in range, after postponing threshold time, export open signal；The power switching module is for receiving open signal
When, so that instantaneous high pressure suppression module and load is connect with input power；The instantaneous high pressure suppression module is inputted for absorbing
Instantaneous high pressure in power supply；The overvoltage time delayed turn-off module is used to be higher than loaded work piece voltage in the voltage for input power occur
High-order voltage limiting value when, after postponing threshold time, export cut-off signals to the voltage stabilizing delay switch module, make described steady
Switch module exports cut-off signals when calendering, and then keeps the connection between instantaneous high pressure suppression module and load and input power disconnected
It opens.Since foregoing circuit can not only realize overload protection, and without using active chip so that circuit cost reduces, and is easy to
It realizes.
Description of the drawings
Fig. 1 is the module map of the overload protecting circuit in an embodiment；
Fig. 2 is the schematic diagram of the overload protecting circuit in Fig. 1；
Fig. 3 is the module map of the overload protecting circuit in an embodiment；
Fig. 4 is the schematic diagram of the overload protecting circuit in Fig. 3.
Specific implementation mode
The utility model is more fully retouched below with reference to relevant drawings for the ease of understanding the utility model,
It states.The preferred embodiment of the utility model is given in attached drawing.But the utility model can in many different forms come in fact
It is existing, however it is not limited to embodiment described herein.Make public affairs to the utility model on the contrary, purpose of providing these embodiments is
The understanding for opening content is more thorough and comprehensive.
Unless otherwise defined, all of technologies and scientific terms used here by the article is led with the technology for belonging to the utility model
The normally understood meaning of technical staff in domain is identical.Terminology used in the description of the utility model herein only be
The purpose of description specific embodiment, it is not intended that limitation the utility model.Term as used herein "and/or" includes one
Any and all combinations of a or multiple relevant Listed Items.
As shown in Figure 1, for the module map of overload protecting circuit.
A kind of overload protecting circuit, including over-pressed time delayed turn-off module 101, voltage stabilizing delay switch module 102, power switch
Module 104 and instantaneous high pressure suppression module 105.The ends Vcc of over-pressed time delayed turn-off module 101, voltage stabilizing delay switch module 102
The ends Vcc at the ends Vcc, the ends Vcc of power switching module 104 and instantaneous high pressure suppression module 105 are all connected with input power.Cross calendering
When shutdown the ground terminal of module 101, the ground terminal of voltage stabilizing delay switch module 102, power switching module 104 ground terminal connect
Power supply exports ground terminal；The ground connection terminating load ground terminal of instantaneous high pressure suppression module 105.The output of over-pressed time delayed turn-off module 101
Terminate the input terminal of voltage stabilizing delay switch module 102；The output of voltage stabilizing delay switch module 102 terminates power switching module 104
Input terminal；The output terminating load ground terminal of power switching module 104.
Voltage stabilizing delay switch module 102 includes first voltage conversion module and the first delays time to control module；First voltage turns
Mold changing block is used to for input power to be converted into the operating voltage needed for the first delays time to control module；It is defeated in first voltage conversion module
When the voltage gone out is less than the threshold range of the operating voltage, the first delays time to control module is for exporting cut-off signals；Power switch
Module 104 is used for when receiving cut-off signals, keeps the connection between instantaneous high pressure suppression module 105 and load and input power disconnected
It opens；
Threshold value model of voltage of the first delays time to control module for being exported in first voltage conversion module in the operating voltage
When enclosing interior, export open signal；Power switching module 104 is used for when receiving open signal, makes instantaneous high pressure suppression module 105
It is connect with load with input power；Instantaneous high pressure suppression module 105 is used to absorb the instantaneous high pressure in input power；Instantaneous high pressure
The voltage threshold of suppression module 105 is not less than the voltage threshold of over-pressed time delayed turn-off module 101 and close over-pressed time delayed turn-off mould
It the voltage threshold of block 101 but is born within voltage range in load.
Over-pressed time delayed turn-off module 101 is used to be higher than in the voltage for input power occur the high-order pressure limiting of loaded work piece voltage
When value, after postponing threshold time, export cut-off signals to voltage stabilizing delay switch module 102, make voltage stabilizing delay switch module
102 output cut-off signals, and then the connection between instantaneous high pressure suppression module 105 and load and input power is made to disconnect.
Overload protecting circuit further includes rectification module 106, and the input termination of rectification module 106 input power, output end are taken over
Press the ends Vcc of time delayed turn-off module 101.In the present embodiment, unidirectional module can replace rectification module 106.
Overload protecting circuit further includes fuse module 107, the input termination rectification module 106 of fuse module 107
Output end, output end take over the ends Vcc of pressure time delayed turn-off module 101.
Rectification module 106 includes 2-4 rectifying tube in parallel.Rectifying tube anode connects input power, the cathode of rectifying tube connects
The input terminal of fuse module 107.When replacing rectification module 106 according to unidirectional module, then unidirectional module includes 1 uniguide
Or the uniguide of multiple parallel connections.And the anode of uniguide connects input power, cathode connects the input terminal of fuse module 107.
Fuse module 107 includes self-recovery fuse R1, and self-recovery fuse R1 mono- terminates the output of rectification module 106
The ends Vcc of pressure time delayed turn-off module 101 are taken at end, the other end.
The position of rectification module 106 and fuse module 107 is interchangeable.
Incorporated by reference to Fig. 2.
Over-pressed time delayed turn-off module 101 includes second voltage conversion module and the second delays time to control module；
Second voltage conversion module is used to for input power to be converted into the operating voltage needed for the second delays time to control；Second prolongs
When the control module voltage that is used to export in second voltage conversion module higher than the operating voltage threshold range and by being delayed
Cut-off signals are exported after threshold time gives voltage stabilizing delay switch module.
Second voltage conversion module includes resistance R3, capacitance C1, voltage-stabiliser tube D6, resistance R9 and resistance R10；Second delay control
Molding block includes reset chip U1；Resistance R3 mono- terminates input power, the cathode of another termination voltage-stabiliser tube D6；Voltage-stabiliser tube D6 is just
Pole connects power supply output ground terminal；Capacitance C1 is in parallel with voltage-stabiliser tube D6；Resistance R9 is in parallel with voltage-stabiliser tube D6；Resistance R10 and resistance R9 is simultaneously
Connection；The points of common connection of the input terminating resistor R3 and voltage-stabiliser tube D6 of reset chip U1, ground connection termination power output ground terminal, output
Terminate the input terminal of voltage stabilizing delay switch module 102.In other embodiments, second voltage conversion module and the second delays time to control
The realization method of module is without being limited thereto, for example, capacitance C1 can be deleted in other embodiments.The number and connection in series-parallel relationship of resistance
Also it can be changed.
In the present embodiment, first voltage conversion module includes field-effect tube Q3, capacitance C2, resistance R4, voltage-stabiliser tube D7, electricity
Hinder R11, resistance R15 and resistance R12；First delays time to control module includes reset chip U2；The grid connecting resistance of field-effect tube Q3
One end of R15, source electrode connect the input terminal that power supply exports ground terminal, drain electrode meets reset chip U2；Resistance R4 mono- terminates input power, separately
The cathode of one termination voltage-stabiliser tube D7；The anode of voltage-stabiliser tube D7 connects power supply output ground terminal；Capacitance C2 is in parallel with voltage-stabiliser tube D7；Resistance
R11 is in parallel with voltage-stabiliser tube D7；Resistance R15 takes over one end the output end of pressure time delayed turn-off module 101, another termination field-effect tube Q3
Grid；Resistance R12 is in parallel with resistance R11；The points of common connection of the input terminating resistor R4 and voltage-stabiliser tube D7 of reset chip U2,
The input terminal for being grounded termination power output ground terminal, exporting termination power switching module 104.In other embodiments, first voltage
Conversion module and the realization method of the first delays time to control module are without being limited thereto, for example, capacitance C2 can be deleted in other embodiments.
The number and connection in series-parallel relationship of resistance also can be changed.
Power switching module 104 includes VRM Voltage Regulator Module and switch tube module；VRM Voltage Regulator Module will be for that will input electricity
Source is adjusted to the operating voltage of switch tube module, and switch tube module is used to receive the open signal of voltage stabilizing delay switch module output
And cut-off signals, and according to open signal and cut-off signals control instantaneous high pressure suppression module 105 and load and input power it
Between connect or disconnect.
VRM Voltage Regulator Module include resistance R16, field-effect tube Q2, resistance R5, voltage-stabiliser tube D8, resistance R8, field-effect tube Q1,
Resistance R6, voltage-stabiliser tube D9 and resistance R14, switch tube module includes field-effect tube Q4；A termination voltage stabilizing delay switch of resistance R16
The output end of module 102, the grid of another termination field-effect tube Q2；The source electrode of field-effect tube Q2 connects power supply output ground terminal, drain electrode
The points of common connection of connecting resistance R5 and voltage-stabiliser tube D8；A termination input power of resistance R5, the cathode of another termination voltage-stabiliser tube D8；
The anode of voltage-stabiliser tube D8 connects power supply output ground terminal；The points of common connection of a terminating resistor R5 and voltage-stabiliser tube D8 of resistance R8, it is another
Terminate the grid of field-effect tube Q1；The source electrode of field-effect tube Q1 connects power supply output ground terminal, drain electrode connecting resistance R6 and voltage-stabiliser tube D9's
Points of common connection；Resistance R6 mono- terminates input power, the cathode of another termination voltage-stabiliser tube D9, and it is defeated that the anode of voltage-stabiliser tube D9 connects power supply
Go out ground terminal；The points of common connection of a terminating resistor R6 and voltage-stabiliser tube D9 of resistance R14, the grid of another termination field-effect tube Q4；
The source electrode of field-effect tube Q4 connects power supply output ground terminal, drain electrode connects load ground terminal.
In the present embodiment, resistance R16, field-effect tube Q2, resistance R5, voltage-stabiliser tube D8, resistance R8, field-effect tube Q1, electricity
The circuit module that resistance R6, voltage-stabiliser tube D9 and resistance R14 are constituted is in order to adjust the input voltage range of Q4, using the circuit mould
After block, the field-effect tube within the scope of free voltage on the market meets the requirements.In other embodiments, VRM Voltage Regulator Module
Realization method is without being limited thereto, and e.g., the number and connection in series-parallel relationship of resistance also can be changed.
Instantaneous high pressure suppression module 105 includes diode (led) module；The anode of diode (led) module connect load ground terminal, cathode connect it is defeated
Enter power supply.In one embodiment, instantaneous high pressure suppression module 105 includes diode D3, diode D4 and diode D5；Two poles
The anode of pipe D5 connects the anode that load ground terminal, cathode meet diode D4, and the cathode of diode D4 connects the anode of diode D3, two poles
The cathode of pipe D3 connects input power.Certainly, the number of diodes included by diode (led) module and connection type are not limited to above-mentioned
3 Diode series, can also be more diodes series connection or multiple diodes in parallel after connect again.
In yet another embodiment, instantaneous high pressure suppression module 105 includes varistor, and varistor one terminates the ends Vcc,
Another terminating load ground terminal.
In above-described embodiment, the reset threshold of reset chip U1 and reset chip U2 is not less than controlled fet gate
In the unlatching threshold value and scene effect tube grid voltage normal range of operation of voltage.
The clamp voltage of voltage-stabiliser tube D6 is higher than the voltage reset value of reset chip U1, but in the normal work of reset chip electricity
It presses in range, the clamp voltage of voltage-stabiliser tube D7 is higher than the voltage reset value of reset chip U2, but in the normal work of reset chip
In voltage range.
The output end of reset chip U1 and the output end of reset chip U2 are less than reset threshold in the voltage of input terminal, then this
Pin is low level, to reset effective status；After the voltage of input terminal rises above VRES+VHYST, this pin will maintain
At least 140 milliseconds of low level, then turns to high level.
Reset chip U1 and reset chip U2 is mainly used for monitoring the digital circuits such as microprocessor, microcontroller, memory
Power supply, and powering on, power down or supply voltage provide reset signal when being less than reset threshold, it is ensured that known to they are operated in
State, avoid the execution of error code.Include voltage comparator inside the circuit, low power consumption voltage a reference source, potential-divider network,
Export delay circuit and output driving circuit.Effective reset signal will be exported when supply voltage is less than reset threshold, in electricity
After source voltage rises above the sum of reset threshold and reset threshold sluggishness, output having at least 140 milliseconds of maintenance is resetted
Effect state.Reset chip U1 and reset chip U2 provides CMOS outputs, and reset chip U1 and reset chip U2 provides low effective
Reset output.Ensure that the power supply bust of short time does not interfere with reset output in design.In entire operating temperature range, when
Reliable output is still ensured that when supply voltage is down to 1.15V.Bust is in addition in power supply electrifying between VCC short time voltages, power down or
Supply voltage provides when being less than reset threshold outside effective reset signal, and reset chip U1 and reset chip U2 is to supply voltage
Short time bust has filtering function, i.e. supply voltage not to will produce reset signal less than reset threshold within a very short time.
Increase (becoming lower than reset threshold) with the amplitude of supply voltage bust, does not generate the arteries and veins of effective reset signal
Rushing width will reduce.It under normal conditions, will not when supply voltage 100 millivolts of the time lower than reset threshold being less than 10 microsecond
Effective reset is will produce to export.It will enhance to supply voltage in the shunt capacitance for adding a 0.1uF close to the place of VCC pins
The filter capacity of short time bust.In VCC=0V, ensure effective reset signal output.When VCC drops to 1.15V or less,
The low active homing output signal no longer pull-down current of reset chip U1 and reset chip U2, reset output signal are in uncertain
State.In most applications, this will not cause any problem, because the circuits such as microcontroller are when supply voltage is down to 1.15V
It cannot work.In order to make reset output signal, when VCC is less than 1.15V, there are one the states determined, can be defeated in reset
An indirect pull down resistor for outlet and ground.The value of this pull down resistor, generally can not be too big at 100 kilohms or so, otherwise rises
It is acted on less than drop-down；Can not be too small, it can influence to reset output state when otherwise working normally.
In above-described embodiment, diode D3, diode D4 and diode D5 are Transient Suppression Diode.
In above-described embodiment, field-effect tube Q1, field-effect tube Q2, field-effect tube Q3 are low pressure field-effect tube.
In above-described embodiment, the clamp voltage of voltage-stabiliser tube D9 is not less than the gate turn-on voltage of field-effect tube Q4, and on the scene
Within the scope of the grid voltage normal working voltage of effect pipe Q4.
Based on above-described embodiment, the operation principle of overload protecting circuit is as follows：
When input power accesses overload protecting circuit, calendering was connected to via rectification module 106 and fuse module 107
When shutdown module 101, voltage stabilizing delay switch module 102, power switching module 104, instantaneous high pressure suppression module 105 and load.
But since power switching module 104 does not turn on also, thus load is not turned on power supply and works.Specifically, when accessing power supply,
The voltage of field-effect tube Q1 is 5V, at this point, field-effect tube Q1 conductings so that field-effect tube Q4 is shutdown, and therefore, load can not connect
Enter power supply.
After accessing power supply for a period of time, voltage stabilizing delay switch module 102 enters voltage stabilizing state, i.e. reset chip U2 controls
Field-effect tube Q2 conductings, thus field-effect tube Q1 shutdowns, after the Q1 shutdowns of scene effect pipe, can make field-effect tube Q4 be conducting,
Thus instantaneous high pressure suppression module 105 and load have access to power supply and work normally.Over-pressed time delayed turn-off module 101 is receiving
When to high pressure, over-pressed time delayed turn-off module 101 first charges to capacitance C1, until after capacitance C1 is full of, reset chip U1 is
It starts to work, and exports the Q3 conductings of control field-effect tube.During this period, instantaneous high pressure suppression module 105 inhibits high pressure
It is supported within the scope of normal working voltage with protection, is delayed to the inhibition of high pressure, keeps the usage experience of product better.It is on the scene
When effect pipe Q3 conducting, reset chip U2 can be controlled and be stopped so that instantaneous high pressure suppression module 105 and load with it is defeated
Enter the separated of power supply so that instantaneous high pressure suppression module 105 is unlikely to that the working time is too long and scaling loss.To realize load
Voltage stabilizing unlatching, low pressure shutdown and high pressure shutdown.
Above-mentioned overload protecting circuit includes over-pressed time delayed turn-off module 101, voltage stabilizing delay switch module 102, power switch
Module 104 and instantaneous high pressure suppression module 105；Voltage stabilizing delay switch module 102 is used to be less than voltage stabilizing in the voltage of input power
When the low level voltage limiting value of threshold value, cut-off signals are exported；The power switching module 104 is used for when receiving cut-off signals, makes wink
When high pressure suppression module 105 and load and input power between connection disconnect；The voltage stabilizing delay switch module 102 is additionally operable to
When the voltage of input power is in the range of voltage stabilizing threshold value, after postponing threshold time, export open signal；The power supply is opened
It closes module 104 to be used for when receiving open signal, instantaneous high pressure suppression module 105 and load is made to be connect with input power；Institute
Instantaneous high pressure suppression module 105 is stated for absorbing the instantaneous high pressure in input power；The overvoltage time delayed turn-off module 101 is used for
When the voltage for input power occur is higher than the high-order voltage limiting value of loaded work piece voltage, after postponing threshold time, output pass
Break signal gives the voltage stabilizing delay switch module 102, so that the voltage stabilizing delay switch module 102 is exported cut-off signals, and then make
Connection between instantaneous high pressure suppression module 105 and load and input power disconnects.Since foregoing circuit can not only be realized
Protection is carried, and without using active chip so that circuit cost reduces, it is easy to accomplish.
In another embodiment, as shown in figure 3, being the module map of overload protecting circuit.
A kind of overload protecting circuit, including over-pressed time delayed turn-off module 201, voltage stabilizing delay switch module 202, power switch
Module 204 and instantaneous high pressure suppression module 205.
The ends Vcc of over-pressed time delayed turn-off module 201, the ends Vcc of voltage stabilizing delay switch module 202 and instantaneous high pressure inhibit mould
The ends Vcc of block 205 are all connected with input power；
The ground terminal of over-pressed time delayed turn-off module 201, the ground terminal of voltage stabilizing delay switch module 202, power switching module
204 ground terminal connects power supply output ground terminal, the ground connection terminating load ground terminal of instantaneous high pressure suppression module 205；
The input terminal of the output termination voltage stabilizing delay switch module 202 of over-pressed time delayed turn-off module 201；Voltage stabilizing delay switch
The input terminal of the output termination power switching module 204 of module 202；The output terminating load ground terminal of power switching module 204；
Voltage stabilizing delay switch module 202 is used for when the voltage of input power is less than the low level voltage limiting value of voltage stabilizing threshold value, defeated
Go out cut-off signals；Power switching module 204 be used for when receiving cut-off signals, make instantaneous high pressure suppression module 205 and load and
Connection between input power disconnects；Voltage stabilizing delay switch module 202 is additionally operable to model of the voltage in voltage stabilizing threshold value of input power
When enclosing interior, after postponing threshold time, export open signal；Power switching module 204 is used for when receiving open signal, is made
Instantaneous high pressure suppression module 205 and load are connect with input power；
Instantaneous high pressure suppression module 205 is used to absorb the instantaneous high pressure in input power；Instantaneous high pressure suppression module 205
Voltage threshold is not less than the voltage threshold of the voltage threshold of over-pressed time delayed turn-off module 201 and close over-pressed time delayed turn-off module 201
It value but is born within voltage range in load.
Over-pressed time delayed turn-off module 201 is used to be higher than in the voltage for input power occur the high-order pressure limiting of loaded work piece voltage
When value, after postponing threshold time, export cut-off signals to voltage stabilizing delay switch module 202, make voltage stabilizing delay switch module
202 output cut-off signals, and then the connection between instantaneous high pressure suppression module 205 and load and input power is made to disconnect.
Incorporated by reference to Fig. 4.
Overload protecting circuit further includes rectification module 206, and the input termination of rectification module 206 input power, output end are taken over
Press the ends Vcc of time delayed turn-off module 201.In the present embodiment, unidirectional module can replace rectification module 206.
Overload protecting circuit further includes fuse module 207, the input termination rectification module 206 of fuse module 207
Output end, output end take over the ends Vcc of pressure time delayed turn-off module 201.
Rectification module 206 includes 2-4 rectifying tube in parallel.Rectifying tube anode connects input power, the cathode of rectifying tube connects
The input terminal of fuse module 207.When replacing rectification module 206 according to unidirectional module, then unidirectional module includes 1 uniguide
Or the uniguide of multiple parallel connections.And the anode of uniguide connects input power, cathode connects the input terminal of fuse module 207.
Fuse module 207 include self-recovery fuse, self-recovery fuse one terminate rectification module 206 output end,
The other end takes over the ends Vcc of pressure time delayed turn-off module 201.
The position of rectification module 206 and fuse module 207 is interchangeable.
Over-pressed time delayed turn-off module 201 includes the 4th voltage transformation module and the 4th delays time to control module；
4th voltage transformation module is used to for input power to be converted into the operating voltage needed for the 4th delays time to control；4th prolongs
When the control module voltage that is used to export in the 4th voltage transformation module higher than the operating voltage threshold range and by being delayed
Cut-off signals are exported after threshold time gives voltage stabilizing delay switch module；
4th voltage transformation module includes resistance R3, capacitance C1, voltage-stabiliser tube D6, resistance R9 and resistance R10；4th delay control
Molding block includes reset chip U1；
Resistance R3 mono- terminates input power, the cathode of another termination voltage-stabiliser tube D6；The anode of voltage-stabiliser tube D6 connects power supply output
Ground terminal；Capacitance C1 is in parallel with voltage-stabiliser tube D6；Resistance R9 is in parallel with voltage-stabiliser tube D6；Resistance R10 is in parallel with resistance R9；Reset chip U1
The points of common connection of input terminating resistor R3 and voltage-stabiliser tube D6, ground connection termination power output ground terminal, output termination voltage stabilizing delay
The input terminal of switch module 202.In other embodiments, the realization side of the 4th voltage transformation module and the 4th delays time to control module
Formula is without being limited thereto, for example, capacitance C1 can be deleted in other embodiments.The number and connection in series-parallel relationship of resistance also can be changed.
Voltage stabilizing delay switch module 202 includes tertiary voltage conversion module and third delays time to control module；
Tertiary voltage conversion module is used to for input power to be converted into the operating voltage needed for third delays time to control module；The
Three delays time to control modules are used to export when the voltage that tertiary voltage conversion module exports is less than the threshold range of the operating voltage
Cut-off signals；Power switching module 204 be used for when receiving cut-off signals, make instantaneous high pressure suppression module 205 and load with it is defeated
The connection entered between power supply disconnects；
The voltage that third delays time to control module is used to export in tertiary voltage conversion module the operating voltage threshold value
When in range, export open signal；Power switching module 204 is used for when receiving open signal, makes instantaneous high pressure suppression module
205 and load connect with input power.
In the present embodiment, tertiary voltage conversion module includes field-effect tube Q3, capacitance C2, resistance R4, voltage-stabiliser tube D7, electricity
Hinder R11, resistance R15 and resistance R12；Third delays time to control module includes reset chip U2；
One end of the grid connecting resistance R15 of field-effect tube Q3, source electrode connect power supply output ground terminal, drain electrode connects reset chip U2's
Input terminal；Resistance R4 mono- terminates input power, the cathode of another termination voltage-stabiliser tube D7；The anode of voltage-stabiliser tube D7 connects power supply output ground
End；Capacitance C2 is in parallel with voltage-stabiliser tube D7；Resistance R11 is in parallel with voltage-stabiliser tube D7；Resistance R15 takes over one end pressure time delayed turn-off module
201 output end, the grid of another termination field-effect tube Q3；Resistance R12 is in parallel with resistance R11；The input terminal of reset chip U2
The points of common connection of connecting resistance R4 and voltage-stabiliser tube D7, ground connection termination power output ground terminal, output terminate power switching module 204
Input terminal.In other embodiments, tertiary voltage conversion module and the realization method of third delays time to control module are without being limited thereto, example
Such as, capacitance C2 can be deleted in other embodiments.The number and connection in series-parallel relationship of resistance also can be changed.
Power switching module 204 includes field-effect tube Q4, and the grid of field-effect tube Q4 connects voltage stabilizing delay switch module 202
Output end, source electrode connect power supply output ground terminal, drain electrode connects load ground terminal.In other embodiment, the realization method of power switch 204 is not
It is limited to this, for example, resistance can be increased between the grid and the output end of reset chip U2 of scene effect pipe Q4.And the number of the resistance
Unlimited and connection in series-parallel connection relation is measured, main final equivalent resistance disclosure satisfy that the effect of partial pressure.
Instantaneous high pressure suppression module 205 includes diode (led) module；The anode of diode (led) module connect load ground terminal, cathode connect it is defeated
Enter power supply.In one embodiment, instantaneous high pressure suppression module 205 includes diode D3, diode D4 and diode D5；Two poles
The anode of pipe D5 connects the anode that load ground terminal, cathode meet diode D4, and the cathode of diode D4 connects the anode of diode D3, two poles
The cathode of pipe D3 connects input power.Certainly, the number of diodes included by diode (led) module and connection type are not limited to above-mentioned
3 Diode series, can also be more diodes series connection or multiple diodes in parallel after connect again.
In yet another embodiment, instantaneous high pressure suppression module 205 includes varistor, and varistor one terminates the ends Vcc,
Another terminating load ground terminal.
In above-described embodiment, the reset threshold of reset chip U1 and reset chip U2 is not less than controlled fet gate
In the unlatching threshold value and scene effect tube grid voltage normal range of operation of voltage.
The clamp voltage of voltage-stabiliser tube D6 is higher than the voltage reset value of reset chip U1, but in the normal work of reset chip electricity
It presses in range, the clamp voltage of voltage-stabiliser tube D7 is higher than the voltage reset value of reset chip U2, but in the normal work of reset chip
In voltage range.
Based on above-described embodiment, the operation principle of overload protecting circuit is as follows：
When input power accesses overload protecting circuit, calendering was connected to via rectification module 206 and fuse module 207
When shutdown module 201, voltage stabilizing delay switch module 202, power switching module 204, instantaneous high pressure suppression module 205 and load.
But since power switching module 204 does not turn on also, thus load is not turned on power supply and works.
After accessing power supply for a period of time, voltage stabilizing delay switch module 202 enters voltage stabilizing state, i.e. reset chip U2 controls
Field-effect tube Q4 is conducting, thus instantaneous high pressure suppression module 205 and load have access to power supply and work normally.Overvoltage delay
Module 201 is turned off when receiving high pressure, is first charged to capacitance C1, until after capacitance C1 is full of, reset chip U1 is just opened
Beginning work, and export the Q3 conductings of control field-effect tube.When the Q3 conductings of scene effect pipe, reset chip U2 output shutdown letters can be controlled
Number, so that instantaneous high pressure suppression module 205 and load are separated with input power, to realize that the voltage stabilizing of load is opened
It opens, low pressure shutdown and high pressure turn off.
In the present embodiment, constituted with the power switching module 204 in Fig. 2 except power switching module 204 it is inconsistent, remaining
It is all made of identical structure.Therefore, over-pressed time delayed turn-off module 201, voltage stabilizing delay switch module 202 and instantaneous high pressure are inhibited
Therefore not to repeat here for the composition and principle of module 205.
The load voltage range that the overload protecting circuit in overload protecting circuit and Fig. 4 in Fig. 2 can be protected is adjustable.
Specifically, it is variable to set input voltage Vo, therefore, when using above-mentioned overload protecting circuit, need to resistance R3, resistance
The resistance value of R9, resistance R4 and resistance R11 are adjusted.Formula Vr/Vo=(R9-Rcd)/((R9-Rcd)+R3) is respectively adopted,
Vr/Vo=(R11-Rcd)/((R11-Rcd)+R4) adjusts the ratio between resistance R3, resistance R9, resistance R4 and resistance R11
Value, wherein Rcd are the equivalent resistance of capacitance and voltage-stabiliser tube, and Vr is the operation threshold voltage of reset chip, and Vo is input power
Voltage.After resistance R3, resistance R9, resistance R4 and resistance R11 meet above-mentioned formula, resistance value size can be unrestricted, but in principle
It says, resistance value is to be the bigger the better, and resistance value is bigger, and the loss of circuit is smaller.And in resistance R3, resistance R9, resistance R4 and resistance R11
After setting, then the load voltage range that can currently protect bears voltage within the scope of this in input voltage Vo to maximum.
Therefore, no matter input voltage Vo increases or reduces, that is, required voltage whether high voltage or low electricity are loaded
Pressure, above-mentioned overload protecting circuit can be protected.
For example, present load can be worked normally in the operating voltage of 20V.So use above-mentioned overload protecting circuit
Afterwards, the resistance value of resistance R3, resistance R9, resistance R4 and resistance R11 are set first, that is, uses formula Vr/Vo=(R9-
Rcd)/((R9-Rcd)+R3), Vr/Vo=(R11-Rcd)/((R11-Rcd)+R4) is set.When input voltage is less than 20V
When, voltage stabilizing delay switch module 202 exports cut-off signals when detecting that voltage is less than 20V, keeps power switching module 204 disconnected
It opens, then load can not access power supply, i.e. load is stopped.
Voltage stabilizing delay switch module 202 is when detecting voltage higher than 20V, but being less than 40V, voltage stabilizing delay switch module
202 output open signals, make power switching module 204 be connected, instantaneous high pressure suppression module 205 and load access power supply and normal
Work.
When inputting high pressure in circuit, by the instantaneous high pressure in 205 absorbing circuit of instantaneous high pressure suppression module, but this can be
It plays a protective role in short time.If lasting input high pressure, then then needing over-pressed time delayed turn-off module 201 to be protected
Shield.When i.e. overvoltage time delayed turn-off module 201 detects lasting high pressure, cut-off signals are exported to voltage stabilizing delay switch module 202.
Cut-off signals are exported by voltage stabilizing delay switch module 202 so that power switching module 204 disconnects, thus plays protection load
Effect.
Similarly, the operating voltage of load be 200V when, equally using formula Vr/Vo=(R9-Rcd)/((R9-Rcd)+
R3), Vr/Vo=(R11-Rcd)/((R11-Rcd)+R4) sets the resistance value of resistance R3, resistance R9, resistance R4 and resistance R11.
After completing to set, protection philosophy is same as above.
Above-mentioned overload protecting circuit includes over-pressed time delayed turn-off module 201, voltage stabilizing delay switch module 202, power switch
Module 204 and instantaneous high pressure suppression module 205；Voltage stabilizing delay switch module 202 is used to be less than voltage stabilizing in the voltage of input power
When the low level voltage limiting value of threshold value, cut-off signals are exported；Power switching module 204 is used for when receiving cut-off signals, makes instantaneous height
The connection between suppression module 205 and load and input power is pressed to disconnect；Voltage stabilizing delay switch module 202 is additionally operable to input power
Voltage in the range of voltage stabilizing threshold value when, after postponing threshold time, export open signal；Power switching module 204 is used
It is connect with input power in when receiving open signal, making instantaneous high pressure suppression module 205 and load；Instantaneous high pressure inhibits mould
Block 205 is used to absorb the instantaneous high pressure in input power；Over-pressed time delayed turn-off module 201 is used in the voltage for input power occur
Higher than loaded work piece voltage high-order voltage limiting value when, after postponing threshold time, export cut-off signals and give voltage stabilizing delay switch
Module 202 makes voltage stabilizing delay switch module 202 export cut-off signals, makes instantaneous high pressure suppression module 205 and load and input electricity
Connection between source disconnects.Since foregoing circuit can not only realize overload protection, and without using active chip so that circuit
Cost reduction, it is easy to accomplish.
Each technical characteristic of embodiment described above can be combined arbitrarily, to keep description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed,
But therefore it can not be interpreted as the limitation to utility model patent range.It should be pointed out that for the common skill of this field
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (10)
1. a kind of overload protecting circuit, which is characterized in that including over-pressed time delayed turn-off module, voltage stabilizing delay switch module, power supply
Switch module and instantaneous high pressure suppression module；
The ends Vcc of the overvoltage time delayed turn-off module, the ends Vcc of the voltage stabilizing delay switch module, the power switching module
The ends Vcc and the ends Vcc of the instantaneous high pressure suppression module be all connected with input power；
The ground terminal of the overvoltage time delayed turn-off module, ground terminal, the power switch mould of the voltage stabilizing delay switch module
The ground terminal of block connects power supply output ground terminal；The ground connection terminating load ground terminal of the instantaneous high pressure suppression module；
The output of the overvoltage time delayed turn-off module terminates the input terminal of the voltage stabilizing delay switch module；The voltage stabilizing delay is opened
The output for closing module terminates the input terminal of the power switching module；The output terminating load ground terminal of the power switching module；
The voltage stabilizing delay switch module includes first voltage conversion module and the first delays time to control module；The first voltage turns
Mold changing block is used to for input power to be converted into the operating voltage needed for the first delays time to control module；Turn in the first voltage
When the voltage of mold changing block output is less than the threshold range of the operating voltage, the first delays time to control module turns off letter for exporting
Number；The power switching module is used for when receiving cut-off signals, and the connection between load and input power is made to disconnect；
When the voltage of first voltage conversion module output is in the threshold range of the operating voltage, the first delay control
Molding block is for exporting open signal；The power switching module is used for when receiving open signal, makes load and input power
Connection；
The instantaneous high pressure suppression module is used to absorb the instantaneous high pressure in input power；
The overvoltage time delayed turn-off module is used for when the voltage of input power is higher than the high-order voltage limiting value of loaded work piece voltage, warp
After crossing delay threshold time, cut-off signals are exported to the voltage stabilizing delay switch module, keep the voltage stabilizing delay switch module defeated
Go out cut-off signals, and then the connection between load and input power is made to disconnect.
2. overload protecting circuit according to claim 1, which is characterized in that the overvoltage time delayed turn-off module includes second
Voltage transformation module and the second delays time to control module；
The second voltage conversion module is used to for input power to be converted into the operating voltage needed for second delays time to control；Institute
State the threshold value model that voltage of the second delays time to control module for being exported in the second voltage conversion module is higher than the operating voltage
It encloses and exports cut-off signals after the delay threshold time to the voltage stabilizing delay switch module.
3. overload protecting circuit according to claim 1, which is characterized in that the power switching module includes that voltage is adjusted
Module and switch tube module；
The VRM Voltage Regulator Module is used to input power being adjusted to the operating voltage switched needed for tube module, the switch
Tube module is used to receive the open signal and cut-off signals of the voltage stabilizing delay switch module output, and according to open signal and pass
Connecting or disconnecting between break signal control load and input power.
4. overload protecting circuit according to claim 1, which is characterized in that the instantaneous high pressure suppression module includes two poles
Tube module；
The anode of the diode (led) module connects load ground terminal, cathode connects input power.
5. overload protecting circuit according to claim 4, which is characterized in that the voltage threshold of the instantaneous high pressure suppression module
Value not less than the over-pressed time delayed turn-off module voltage threshold and close to the voltage threshold of the overvoltage time delayed turn-off module but
It is born within voltage range in load.
6. a kind of overload protecting circuit, which is characterized in that including over-pressed time delayed turn-off module, voltage stabilizing delay switch module, power supply
Switch module and instantaneous high pressure suppression module；
The ends Vcc of the overvoltage time delayed turn-off module, the ends Vcc of the voltage stabilizing delay switch module, the instantaneous high pressure inhibit
The ends Vcc of module are all connected with input power；
The ground terminal of the overvoltage time delayed turn-off module, ground terminal, the power switch mould of the voltage stabilizing delay switch module
The ground terminal of block connects power supply output ground terminal；The ground connection terminating load ground terminal of the instantaneous high pressure suppression module；
The output of the overvoltage time delayed turn-off module terminates the input terminal of the voltage stabilizing delay switch module；The voltage stabilizing delay is opened
The output for closing module terminates the input terminal of the power switching module；The output terminating load ground terminal of the power switching module；
The voltage stabilizing delay switch module is used for when the voltage of input power is less than the low level voltage limiting value of voltage stabilizing threshold value, and output is closed
Break signal；The power switching module is used for when receiving cut-off signals, and the connection between load and input power is made to disconnect；Institute
State voltage stabilizing delay switch module when being additionally operable to the voltage of input power in voltage stabilizing threshold range, after postponing threshold time,
Export open signal；The power switching module is used for when receiving open signal, and load is made to be connect with input power；
The instantaneous high pressure suppression module is used to absorb the instantaneous high pressure in input power；
The overvoltage time delayed turn-off module is used to be higher than in the voltage for input power occur the high-order voltage limiting value of loaded work piece voltage
When, after postponing threshold time, export cut-off signals give the voltage stabilizing delay switch module, make the voltage stabilizing delay switch mould
Block exports cut-off signals, and then the connection between load and input power is made to disconnect.
7. overload protecting circuit according to claim 6, which is characterized in that the voltage stabilizing delay switch module includes third
Voltage transformation module and third delays time to control module；
The tertiary voltage conversion module is used to input power being converted into the electricity of the work needed for the third delays time to control module
Pressure；When the voltage of tertiary voltage conversion module output is less than the threshold range of the operating voltage, the third delay control
Molding block is for exporting cut-off signals；The power switching module is used for when receiving cut-off signals, makes load and input power
Between connection disconnect；
When the voltage of tertiary voltage conversion module output is in the threshold range of the operating voltage, the third delay control
Molding block is for exporting open signal；The power switching module is used for when receiving open signal, makes load and input power
Connection.
8. overload protecting circuit according to claim 6, which is characterized in that the overvoltage time delayed turn-off module includes the 4th
Voltage transformation module and the 4th delays time to control module；
4th voltage transformation module is used to for input power to be converted into the operating voltage needed for the 4th delays time to control；Institute
State the threshold value model that voltage of the 4th delays time to control module for being exported in the 4th voltage transformation module is higher than the operating voltage
It encloses and exports cut-off signals after the delay threshold time to the voltage stabilizing delay switch module.
9. overload protecting circuit according to claim 6, which is characterized in that the power switching module includes field-effect tube
Output end, the source electrode that the grid of Q4, the field-effect tube Q4 connect the voltage stabilizing delay switch module connect power supply output ground terminal, drain electrode
Connect load ground terminal.
10. overload protecting circuit according to claim 6, which is characterized in that the instantaneous high pressure suppression module includes two
Pole pipe module；
The anode of the diode (led) module connects load ground terminal, cathode connects input power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721926380.7U CN207782383U (en) | 2017-12-30 | 2017-12-30 | Overload protecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721926380.7U CN207782383U (en) | 2017-12-30 | 2017-12-30 | Overload protecting circuit |
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| Publication Number | Publication Date |
|---|---|
| CN207782383U true CN207782383U (en) | 2018-08-28 |
Family
ID=63222414
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721926380.7U Active CN207782383U (en) | 2017-12-30 | 2017-12-30 | Overload protecting circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108039697A (en) * | 2017-12-30 | 2018-05-15 | 深圳市松朗科技有限公司 | Overload protecting circuit |
| CN109407592A (en) * | 2018-12-18 | 2019-03-01 | 安徽庆宇光电科技有限公司 | A kind of remote sensing monitoring control circuit |
-
2017
- 2017-12-30 CN CN201721926380.7U patent/CN207782383U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108039697A (en) * | 2017-12-30 | 2018-05-15 | 深圳市松朗科技有限公司 | Overload protecting circuit |
| CN109407592A (en) * | 2018-12-18 | 2019-03-01 | 安徽庆宇光电科技有限公司 | A kind of remote sensing monitoring control circuit |
| CN109407592B (en) * | 2018-12-18 | 2024-01-19 | 安徽庆宇光电科技有限公司 | Remote sensing monitoring control circuit |
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