CN209046523U - Power-on and power-off sequencing circuit and electronic equipment - Google Patents
Power-on and power-off sequencing circuit and electronic equipment Download PDFInfo
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- CN209046523U CN209046523U CN201821870398.4U CN201821870398U CN209046523U CN 209046523 U CN209046523 U CN 209046523U CN 201821870398 U CN201821870398 U CN 201821870398U CN 209046523 U CN209046523 U CN 209046523U
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Abstract
The utility model discloses a kind of power-on and power-off sequencing circuit and electronic equipment, the power-on and power-off sequencing circuit includes power module, delay control circuit, voltage comparator circuit, first switch circuit, signal shielding circuit and the power output end of electronic device connection, the input terminal of delay control circuit, the input terminal of voltage comparator circuit, first switch circuit the first connecting pin connect respectively with power module, the output end of delay control circuit is connect with the controlled end of first switch circuit；The output end of voltage comparator circuit is connect with the input terminal of the signal shielding circuit；The second connection end of first switch circuit connects the power output end；The output end of the signal shielding circuit is connect with the controlled end of the first switch circuit.The utility model is solved to be controlled in power supply power-on and power-off scheme by integrated circuit, it is difficult to while realizing wide scope time and the control of electric current of power-on and power-off, and be difficult to solve the problems, such as that larger range changes power-on time and size of current.
Description
Technical field
The utility model relates to electronic circuit technology field, in particular to a kind of power-on and power-off sequencing circuit and electronics are set
It is standby.
Background technique
In the design of various electronic products, it is often necessary to control the power-on and power-off sequence of power supply, to prevent in master
When input supply voltage is loaded directly into load, load is made to generate current over pulse, damages circuit, cause unpredictable consequence.
Especially in the design of direct current power amplifier, if do not controlled the power-on and power-off sequence of power supply, output voltage/electric current can be made
Overshoot damages circuit components, causes serious consequence.
The existing technical solution controlled power-on and power-off sequence, is generally realized using power-on and power-off sequence integrated circuit,
There are following technical disadvantages for this scheme: (1), integrated circuit be difficult by the adjustment of ambient parameters come larger range change power on
Time；(2), using the scheme of integrated circuit control power supply power-on and power-off, the control or lower electric sequence of electric sequence can only be realized
Control, if to accomplish to power-on and power-off while control, needs higher cost, it is difficult to large-scale promotion.
Utility model content
The main purpose of the utility model is to propose that a kind of power-on and power-off sequence carries out control and electronic equipment, it is intended to be solved existing
There is the scheme using integrated circuit control power supply power-on and power-off, it is difficult to control power-on time and be difficult to be realized simultaneously to the upper of power supply
The problem of lower electric control.
To achieve the above object, the utility model proposes a kind of power-on and power-off sequencing circuits.
Optionally, which includes power module, delay control circuit, voltage comparator circuit,
One switching circuit, signal shielding circuit and the power output end for load connection, it is the input terminal of the delay control circuit, described
The input terminal of voltage comparator circuit, the first switch circuit the first connecting pin connect respectively with the power module, it is described
The output end of delay control circuit is connect with the controlled end of the first switch circuit；The output end of the voltage comparator circuit with
The controlled end of the signal shielding circuit connects；The second connection end of the first switch circuit connects the power output end；
First connecting pin of the signal shielding circuit is connect with the controlled end of the first switch circuit, the signal shielding circuit
Second connection end ground connection；Wherein,
The delay control circuit, for being delayed when receiving the power supply signal of the power module output, and
First control signal is exported after delay to the first switch circuit；
The voltage comparator circuit, the supply voltage for exporting in the power module are less than defeated when its reference voltage value
Second control signal out, the output third control letter when the supply voltage of power module output is greater than its reference voltage value
Number；
The first switch circuit, it is for the unlatching when receiving the first control signal, the power module is defeated
Power supply signal output out；
The signal shielding circuit, for being carried out to the first control signal when receiving the second control signal
Shielding；When receiving the third control signal, the first control signal is discharged.
Optionally, the delay control circuit include DC/DC converter, first capacitor, the second capacitor, first resistor and
The positive input of first diode, the DC/DC converter is connect with the power module, the DC/DC converter it is anti-
Phase input end grounding, the positive output end of the DC/DC converter, the first end of the first resistor, the first capacitor
The interconnection of the cathode of first end and the first diode, the inverse output terminal of the DC/DC converter and the first capacitor
The common end of second end connect with the power module；The anode of the second end of the first resistor, the first diode
And the first end interconnection of second capacitor, the second end of the first resistor are the output end of the delay control circuit；
The second end of second capacitor is grounded.
Optionally, the voltage comparator circuit includes second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the two or two
Pole pipe and voltage comparator, the non-inverting input terminal of the voltage comparator, the second end of the second resistance and described second
The cathode of diode interconnects, the voltage comparator inverting input terminal, the second end of the 3rd resistor and the 4th resistance
First end interconnection, the output end of the voltage comparator are the output end of the voltage comparator circuit；The of the second resistance
One end, the first end of the 3rd resistor, the first end of the 5th resistance and the voltage comparator power end public affairs
End is connect with the power supply altogether；The second end of 4th resistance is grounded；The plus earth of second diode；Described 5th
The second end of resistance is connect with the output end of the voltage comparator.
Optionally, the voltage comparator is single voltage limit comparator.
Optionally, second diode is zener diode.
Optionally, the first switch circuit includes the first electronic switch, and the controlled end of first electronic switch is institute
The controlled end of first switch circuit is stated, the first connecting pin of first electronic switch is the first company of the first switch circuit
End is connect, the second connection end of first electronic switch is the second connection end of the first switch circuit；Three or two pole
The cathode of pipe is connect with the controlled end of first electronic switch, the anode of the third diode and first electronic switch
Second connection end connection.
Optionally, the first switch circuit further includes third diode, the cathode of the third diode and described the
The controlled end of one electronic switch connects, and the second connection end of the anode of the third diode and first electronic switch connects
It connects.
Optionally, first electronic switch is metal-oxide-semiconductor, the grid of the metal-oxide-semiconductor be the first switch circuit by
End is controlled, the drain electrode and the second connection end of the first switch circuit of the metal-oxide-semiconductor, the source electrode of the metal-oxide-semiconductor is described first
The second connection end of switching circuit.
Optionally, the signal shielding circuit be the second electronic switch, the controlled end of second electronic switch with it is described
The output end of voltage comparator circuit connects, and the first connecting pin of second electronic switch is controlled with the first switch circuit
End connection, the second connection end ground connection of second electronic switch.
The utility model also proposes electronic equipment, which includes power-on and power-off sequencing circuit as described above；
The power-on and power-off sequencing circuit includes power module, delay control circuit, voltage comparator circuit, first switch circuit, signal
Screened circuit and power output end for load connection, the input terminal of the delay control circuit, the voltage comparator circuit
Input terminal, the first switch circuit the first connecting pin connect respectively with the power module, the delay control circuit
Output end is connect with the controlled end of the first switch circuit；The output end of the voltage comparator circuit and signal shielding electricity
The input terminal on road connects；The second connection end of the first switch circuit connects the power output end；The signal shielding electricity
The output end on road is connect with the controlled end of the first switch circuit；Wherein, the delay control circuit, for receiving
It is delayed when stating the power supply signal of power module output, and exports first control signal after delay and open to described first
Powered-down road；The voltage comparator circuit, the supply voltage for exporting in the power module are less than defeated when its reference voltage value
Second control signal out, the output third control letter when the supply voltage of power module output is greater than its reference voltage value
Number；The first switch circuit, for the unlatching when receiving the first control signal, the electricity that the power module is exported
Source signal output；The signal shielding circuit, for when receiving the second control signal, to the first control signal into
Row shielding；When receiving the third control signal, the first control signal is discharged.
The utility model exports after being postponed by setting delay control circuit to the supply voltage of input, so that
The voltage of power module rises to before normal voltage, and first switch circuit is in an off state, while passing through setting voltage ratio
Compared with circuit and signal shielding circuit, before power module rises to normal voltage, control signal shielding circuits mask first
The output of signal, to forbid first switch circuit to be connected, when being only raised to normal voltage on the supply voltage, signal shielding at this time
Circuit allows first control signal to export, so that first switch circuit is connected, power output end is normally exported；And in power module
When power down, signal shielding circuit receives the second control signal of voltage comparator circuit output, to shield first control signal
Output, quickly first switch circuit is fallen in cut-off, so that the electric current in load be made directly to be zero.The utility model power-on and power-off sequence is controlled
Circuit processed can be simultaneously by setting delay control circuit, voltage comparator circuit, signal shielding circuit and first switch circuit
It realizes the control to power module power-on and power-off, solves the scheme for controlling power supply power-on and power-off by integrated circuit at present, it is difficult to same
The control of Shi Shixian power-on and power-off, and it is difficult to the problem of power-on time is changed come larger range by the adjustment of ambient parameters.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, the structure that can also be shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the functional block diagram of one embodiment of the utility model power-on and power-off sequencing circuit；
Fig. 2 is the electrical block diagram of one embodiment of the utility model power-on and power-off sequencing circuit.
Drawing reference numeral explanation:
The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describing, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than all
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, fall within the protection scope of the utility model.
It is to be appreciated that if related in the utility model embodiment directionality instruction (such as upper and lower, left and right, it is preceding,
Afterwards ...), then directionality instruction is only used for explaining opposite between each component under a certain particular pose (as shown in the picture)
Positional relationship, motion conditions etc., if the particular pose changes, directionality instruction is also correspondingly changed correspondingly.
In addition, if relating to the description of " first ", " second " etc. in the utility model embodiment, " first ", " the
Two " etc. description is used for description purposes only, and is not understood to indicate or imply its relative importance or is implicitly indicated meaning
The quantity of the technical characteristic shown." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one
A this feature.It in addition, the technical solution between each embodiment can be combined with each other, but must be with ordinary skill
Based on personnel can be realized, this technical side will be understood that when the combination of technical solution appearance is conflicting or cannot achieve
The combination of case is not present, also not within the protection scope of the requires of the utility model.
The utility model proposes a kind of power-on and power-off sequencing circuits, are applied in electronic equipment.
Referring to Fig.1, in an embodiment of the utility model, which includes power module 100, prolongs
Slow control circuit 200, voltage comparator circuit 300, first switch circuit 500, signal shielding circuit 400 and the electricity for load connection
Source output terminal PV, the input terminal of the delay control circuit 200, the input terminal of the voltage comparator circuit 300, described first open
First connecting pin on powered-down road 500 is connect with the power module 100 respectively, the output end of the delay control circuit 200 with
The controlled end of the first switch circuit 500 connects；The output end of the voltage comparator circuit 300 and the signal shielding circuit
400 controlled end connection；The second connection end of the first switch circuit 500 connects the power output end PV；The signal
First connecting pin of screened circuit 400 is connect with the controlled end of the first switch circuit 500, the signal shielding circuit 400
Second connection end ground connection；Wherein,
The delay control circuit 200, for being prolonged when receiving the power supply signal that the power module 100 exports
When, and first control signal is exported to the first switch circuit 500 after delay；
The voltage comparator circuit 300, the supply voltage for exporting in the power module 100 are less than its reference voltage
Second control signal is exported when value, is exported when the supply voltage of the power module 100 output is greater than its reference voltage value
Third controls signal；
The first switch circuit 500, for the unlatching when receiving the first control signal, by the power module
The power supply signal output of 100 outputs；
The signal shielding circuit 400, for when receiving the second control signal, to the first control signal into
Row shielding；When receiving the third control signal, the first control signal is discharged.
In the present embodiment, delay control circuit 200 can be realized by RC retardation ratio circuit, and delay time is prolonged by forming the RC
The resistance R and capacitor C of slow circuit determine, specifically can be by adjusting the resistance value of resistance R and the capacity of capacitor C come when controlling delay
Between.
In the present embodiment, first switch circuit 500 can pass through the switching devices such as triode, metal-oxide-semiconductor and relay respectively
It realizes.
In the present embodiment, signal shielding circuit 400 can realize one using capacitive absorption circuit control first control signal
Inner shield first control signal of fixing time drags down circuit using level and drags down first control signal level and realizes.
In the present embodiment, when the voltage of power supply 100 is before rising to normal voltage, since RC retardation ratio circuit need to be passed through,
Therefore it can be by adjusting the parameter of resistance R and capacitor C in RC retardation ratio circuit, so that the delay time is greater than on the voltage of power supply 100
It is raised to the time of normal voltage, so that first switch circuit 500 is in front of the voltage of power supply 100 rises to normal voltage
Off state, i.e. power output end PV are not exported, and how long process normally exports is determined by RC retardation ratio circuit.Meanwhile electricity
Pressure comparison circuit 300 and signal shielding circuit 400 control the on state of first switch circuit 500.For example, when voltage compares
When voltage control signal (i.e. the second control signal) of circuit output high level, signal shielding circuit 400 is by first control signal
It masks, drags down circuit for example, by using level, the level that circuit drags down first control signal is dragged down by level, to ensure that RC prolongs
First switch circuit 500 is in an off state before slow circuit completes delay；When comparison circuit exports low level voltage control
Signal (i.e. third control signal), signal shielding circuit 400 allows first control signal to export, and then makes first switch circuit
500 conductings, power output end PV are normally exported.
It is understood that power-on and power-off sequencing circuit power output end PV is loaded for connecting, in traditional circuit
In, when power module 100 powers on, if without the power-on and power-off sequencing circuit, it is directly tested with supply voltage access
Load will lead to tested load and burn because the electric current of input is excessive；In lower electric process, when power module 100 drops to not
When circuit system can be made to work normally, the switching tube in load is likely to be on state, does not drop to the power supply electricity of no-voltage also
Pressure can be loaded into load, generate lower electricity overshoot.And pass through the delay of delay control circuit 200 in the power-on and power-off sequencing circuit
Effect and voltage comparator circuit 300 further act on the cut-off of first switch circuit 500, can make power output end PV's
Power-on time is much later than powering on for power module 100, it is ensured that is powered in power module 100 so that entire circuit system is normal
Power output end PV is just started power up after work, and current over pulse will not be generated by being at this moment tested load；In lower electricity suddenly, that is, work as electricity
Source voltage decline to a certain extent when (threshold voltage that guarantee system can work normally) namely voltage comparator circuit 300 in
The voltage of voltage comparator non-inverting input terminal is less than the voltage of inverting input terminal, and then voltage comparator circuit 300 is made to export high electricity
Signal shielding circuit 400 is connected in flat voltage control signal, since 400 second connection end of signal shielding circuit is grounded, thus
The end voltage of 500 controlled end of first switch circuit has been dragged down, so that first switch circuit 500 quickly ends, has made the electricity in load
Stream ensure that the safety of load directly to zero.
The utility model exports after being postponed by setting delay control circuit 200 to the supply voltage of input, with
Make before the voltage of power module 100 rises to normal voltage, first switch circuit 500 is in an off state, passes through simultaneously
Setting voltage comparator circuit 300 and signal shielding circuit 400 make signal screen before power module 100 rises to normal voltage
The output that circuit 400 shields first control signal is covered only to rise on the supply voltage to forbid first switch circuit 500 to be connected
When to normal voltage, signal shielding circuit 400 allows first control signal to export at this time, so that first switch circuit 500 is connected,
Power output end PV is normally exported；And in 100 power down of power module, signal shielding circuit receives voltage comparator circuit 300
The second control signal of output, to shield the output of first control signal, quickly first switch circuit 500 is fallen in cut-off, to make
Electric current in load is directly zero.The utility model power-on and power-off sequencing circuit passes through setting delay control circuit 200, voltage
Comparison circuit 300, signal shielding circuit 400 and first switch circuit 500 can be realized simultaneously to 100 power-on and power-off of power module
Control.The utility model is solved to be controlled in power supply power-on and power-off scheme by integrated circuit, it is difficult to while realizing power-on and power-off
The control of wide scope time and electric current, and be difficult to solve the problems, such as that larger range changes power-on time and size of current.
Referring to Fig. 2, in an alternative embodiment, the delay control circuit 200 includes DC/DC converter U1, the first electricity
Hold C1, the second capacitor C2, first resistor R1 and first diode D1, the positive input of the DC/DC converter U1 and institute
Power module POW connection is stated, the forward direction of the reverse inter-input-ing ending grounding of the DC/DC converter U1, the DC/DC converter U1 is defeated
Outlet, the first end of the first resistor R1, the first end of the first capacitor C1 and the first diode D1 cathode
Interconnection, the common end of the second end of the inverse output terminal and first capacitor C1 of the DC/DC converter U1 and the power supply
Module POW connection；The second end of the first resistor R1, the anode of the first diode D1 and the second capacitor C2
First end interconnection, the second end of the first resistor R1 are the output end of the delay control circuit 200；The second capacitor C2
Second end ground connection.
In the present embodiment, power module POW is after DC/DC converter U1 is converted to the operating voltage of circuit system through by the
For the RC retardation ratio circuit output of one resistance R1 and the second capacitor R2 composition to first switch circuit 500, another way power module POW is defeated
Outlet is connect with the second end of first capacitor C1, and is exported after first capacitor C1 energy storage delay.First diode is by with
One diodes in parallel, cathode connect the first end of diode, and anode connects the second end of diode, and the second capacitor C2 can be made fully charged
The output end of repid discharge afterwards, RC retardation ratio circuit is connect with first switch circuit 500, which can ensure that in power supply mould
Block POW rises to before normal voltage, and first switch circuit 500 is in off state, and delay time can be by adjusting the first electricity
The capacity of the resistance value of R1, first capacitor C1 and the second capacitor C2 are hindered to control.
Referring to Fig. 2, in an alternative embodiment, the voltage comparator circuit 300 includes second resistance R2,3rd resistor
R3, the 4th resistance R4, the 5th resistance R5, the second diode D2 and voltage comparator U2, the voltage comparator U2's is same mutually defeated
Enter the cathode interconnection of end, the second end of the second resistance R2 and the second diode D2, the voltage comparator U2 is anti-
The first end of phase input terminal, the second end of the 3rd resistor R3 and the 4th resistance R4 interconnects, the voltage comparator U2's
Output end is the output end of the voltage comparator circuit 300；The of the first end of the second resistance R2, the 3rd resistor R3
The common end at the power module end of one end, the first end of the 5th resistance R5 and the voltage comparator U2 and the power supply
Module POW connection；The second end of the 4th resistance R4 is grounded；The plus earth of the second diode D2；5th electricity
The second end of resistance R5 is connect with the output end of the voltage comparator U2.
Further, the voltage comparator U2 is single voltage limit comparator, and the second diode D2 is two pole of pressure stabilizing
Pipe.
In the present embodiment, the cathode of zener diode is connect with the non-inverting input terminal of single voltage limit comparator, two pole of pressure stabilizing
Pipe is usually set to guarantee other for providing one reference voltage of non-inverting input terminal of single voltage limit comparator, the reference voltage
It can work normally using the circuit of power module POW.
Specifically, power module POW is input to the homophase input of single voltage limit comparator through resistance R2 and zener diode
End, the bleeder circuit that another way is formed via 3rd resistor R3 and the 4th resistance R4, and by 3rd resistor R3 and the 4th resistance R4
Common end be input to the inverting input terminal of single voltage limit comparator, input the voltage of the inverting input terminal of single voltage limit comparator
Value is the voltage that the 4th both ends resistance R4 are got.When power module POW is just started power up, i.e., when power module POW is input to
When the voltage value of the non-inverting input terminal of voltage comparator is lower than the pressure stabilizing value of voltage-stabiliser tube, the non-inverting input terminal of single voltage limit comparator
Voltage be greater than inverting input terminal voltage, at this time U2 export high level, when the flat voltage signal of this high point reaches signal shielding
When the conduction threshold of circuit 400, signal shielding circuit 400 is connected.When power module POW is input to the same phase of voltage comparator U2
When the voltage value of input terminal rises above the pressure stabilizing value of voltage-stabiliser tube, with the rising of POW voltage, there is single voltage limit comparator
The voltage of non-inverting input terminal be less than the voltage of inverting input terminal, U2 exports low level at this time, and then makes signal shielding circuit 400
Cut-off.
Referring to Fig. 2, in an alternative embodiment, the first switch circuit 500 includes the first electronic switch Q1, and described the
The controlled end of one electronic switch Q1 is the controlled end of the first switch circuit 500, and the first of the first electronic switch Q1 connects
Connect the first connecting pin that end is the first switch circuit 500, the second connection end of the first electronic switch Q1 is described the
The second connection end of one switching circuit 500.
Further, the first switch circuit 500 further includes third diode D3, the cathode of the third diode D3
It is connect with the controlled end of the first electronic switch Q1, the anode of the third diode D3 is with the first electronic switch Q1's
Second connection end connection.
In the present embodiment, NMOS tube is can be used to realize in the first electronic switch Q1, and the grid of the metal-oxide-semiconductor is described first
The controlled end of switching circuit 500, the drain electrode and the second connection end of the first switch circuit 500 of the metal-oxide-semiconductor, the MOS
The source electrode of pipe is the second connection end of the first switch circuit 500.By being arranged one between the grid and drain electrode of NMOS tube
Diode, the reaction gesture to protect NMOS tube to exempt to be supported generation are punctured.
In the present embodiment, when power module POW is before rising to normal voltage, since delay control circuit need to be passed through
The voltage of 200 delayed-action, i.e. 200 output end of delay control circuit is not up to the conduction threshold of the NMOS tube, at this time NMOS
Pipe is in off state, while first switch circuit is connected, and the controlled terminal potential of first switch circuit 500 is dragged down, to ensure PV
There is no voltage output；It is later than how long normally output to be determined by RC retardation ratio circuit, at this time the output end of delay control circuit 200
High level is exported, when the voltage signal of this high level reaches the conduction threshold of NMOS tube, NMOS transistor conduction, PV is normally exported.
In other embodiments, the realization of the switch elements such as metal-oxide-semiconductor or relay can also be used in the first electronic switch Q1, herein
With no restrictions.
Referring to Fig. 2, in an alternative embodiment, the signal shielding circuit 400 is the second electronic switch Q2, described second
The controlled end of electronic switch Q2 is the controlled end of the signal shielding circuit 400, the first connection of the second electronic switch Q2
End is the first connecting pin of the signal shielding circuit 400, and the second connection end of the second electronic switch Q2 is the signal
The second connection end of screened circuit 400.
Further, the second electronic switch Q2 can be realized with NPN type triode, the base stage of the NPN type triode
For the controlled end of the second electronic switch Q2, the of the extremely described second electronic switch Q2 of the current collection of the NPN type triode
One connecting pin, the second connection end of the extremely described second electronic switch Q2 of transmitting of the NPN type triode.
In the present embodiment, the base stage of NPN type triode is the controlled end of signal shielding circuit 400, the collection of NPN type triode
Electrode is connect with the controlled end of first switch circuit 500, the emitter ground connection of NPN type triode.When power module POW rises just
Before normal voltage, voltage comparator U1 output end exports the voltage signal of high level, and when the conducting for reaching the NPN type triode
When threshold value, NPN type triode conducting by connecting with the controlled end of first switch circuit 500, and then can drag down point electricity
Position, so that first switch circuit 500 be forbidden to be connected；Only when power module POW rises to normal voltage, voltage comparator U1
Output end exports low level voltage signal, and turns off NPN type triode, at this time if delay control circuit is completed,
PV starts normally to export；When power module POW lower electricity suddenly, i.e., when voltage comparator inverting input terminal voltage is less than with mutually defeated
When entering the voltage at end, voltage comparator U1 exports the voltage signal of high level, so that electronic switch Q2 is connected, and then drags down first
500 controlled end voltage of switching circuit, so that first switch circuit 500 be made to rapidly switch off, PV is without output.
This scheme passes through voltage comparator circuit 300 and signal shielding circuit when lower electricity suddenly occurs for power module POW
400 turn off rapidly first switch circuit 500, so that PV output is zero, to make the electric current of load directly to zero, ensure that load
Safety.
In the present embodiment, signal shielding circuit 400, which is used, by the level that electronic switch is constituted drags down circuit to realize,
In other embodiments, shielding of the realization such as capacitive absorption circuit to first control signal can also be used in signal shielding circuit 400
With output action, herein with no restrictions.
It is understood that the utility model power-on and power-off sequencing circuit is by using discrete circuit components (electricity
Resistance, capacitor, diode etc.) Lai Shixian, by adjusting the parameter of circuit components, power module voltage can respectively correspond different
Value solves the scheme that tradition controls power-on and power-off sequence using integrated circuit, and control electric current is smaller, and general every kind of voltage
The problem of being worth a kind of corresponding integrated circuit.
The utility model also proposes a kind of electronic equipment, and the electronic equipment includes power-on and power-off sequential control as described above
Circuit.The detailed construction of the power-on and power-off sequencing circuit can refer to above-described embodiment, and details are not described herein again；It is understood that
It is, due to having used above-mentioned power-on and power-off sequencing circuit in the utility model electronic equipment, the utility model electronics
The embodiment of equipment includes whole technical solutions of above-mentioned power-on and power-off sequencing circuit whole embodiments, and technology achieved
Effect is also identical, and details are not described herein.
The above is only the preferred embodiment of the present invention, and therefore it does not limit the scope of the patent of the utility model,
Under all utility models in the utility model are conceived, equivalent structure made based on the specification and figures of the utility model
Transformation, or directly/be used in other related technical areas indirectly and be included in the scope of patent protection of the utility model.
Claims (10)
1. a kind of power-on and power-off sequencing circuit, which is characterized in that the power-on and power-off sequencing circuit includes power module, delay
Control circuit, voltage comparator circuit, first switch circuit, signal shielding circuit and the power output end of electronic device connection,
First connection of the input terminal of the delay control circuit, the input terminal of the voltage comparator circuit, the first switch circuit
End is connect with the power module respectively, and the controlled end of the output end of the delay control circuit and the first switch circuit connects
It connects；The output end of the voltage comparator circuit is connect with the input terminal end of the signal shielding circuit；The first switch circuit
Second connection end connect the power output end；The output end end of the signal shielding circuit and the first switch circuit
Controlled end connection；Wherein,
The delay control circuit for being delayed when receiving the power supply signal of the power module output, and is prolonging
When after export first control signal to the first switch circuit；
The voltage comparator circuit, supply voltage for exporting in the power module export the when being less than its reference voltage value
Two control signals, when the supply voltage of power module output is greater than its reference voltage value, output third controls signal；
The first switch circuit exports the power module for the unlatching when receiving the first control signal
Power supply signal output；
The signal shielding circuit, for being shielded to the first control signal when receiving the second control signal；
When receiving the third control signal, the first control signal is discharged.
2. power-on and power-off sequencing circuit as described in claim 1, which is characterized in that the delay control circuit includes DC/
DC converter, first capacitor, the second capacitor, first resistor and first diode, the positive input of the DC/DC converter
It is connect with the power module, the reverse inter-input-ing ending grounding of the DC/DC converter, the positive output of the DC/DC converter
The cathode at end, the first end of the first resistor, the first end of the first capacitor and the first diode interconnects, described
The inverse output terminal of DC/DC converter is connect with the power module respectively with the second end of the first capacitor；Described first
The first end of the second end of resistance, the anode of the first diode and second capacitor interconnects, the first resistor
Second end is the output end of the delay control circuit；The second end of second capacitor is grounded.
3. power-on and power-off sequencing circuit as described in claim 1, which is characterized in that the voltage comparator circuit includes second
Resistance, 3rd resistor, the 4th resistance, the 5th resistance, the second diode and voltage comparator, the voltage comparator it is same mutually defeated
Enter the cathode interconnection of end, the second end of the second resistance and second diode, the voltage comparator anti-phase input
The first end interconnection at end, the second end of the 3rd resistor and the 4th resistance, the output end of the voltage comparator is described
The output end of voltage comparator circuit；The first end of the second resistance, the first end of the 3rd resistor, the 5th resistance
The common end of the power end of first end and the voltage comparator is connect with the power supply；Second termination of the 4th resistance
Ground；The plus earth of second diode；The second end of 5th resistance is connect with the output end of the voltage comparator.
4. power-on and power-off sequencing circuit as claimed in claim 3, which is characterized in that the voltage comparator is single voltage limit
Comparator.
5. power-on and power-off sequencing circuit as claimed in claim 3, which is characterized in that second diode is two pole of pressure stabilizing
Pipe.
6. power-on and power-off sequencing circuit as described in claim 1, which is characterized in that the first switch circuit includes first
Electronic switch, the controlled end of first electronic switch are the controlled end of the first switch circuit, first electronic switch
The first connecting pin be the first switch circuit the first connecting pin, the second connection end of first electronic switch is described
The second connection end of first switch circuit.
7. power-on and power-off sequencing circuit as claimed in claim 6, which is characterized in that the first switch circuit further includes
Three diodes, the cathode of the third diode are connect with the controlled end of first electronic switch, the third diode
Anode is connect with the second connection end of first electronic switch.
8. power-on and power-off sequencing circuit as claimed in claim 6, which is characterized in that first electronic switch is metal-oxide-semiconductor,
The grid of the metal-oxide-semiconductor is the controlled end of the first switch circuit, drain electrode and the first switch circuit of the metal-oxide-semiconductor
Second connection end, the source electrode of the metal-oxide-semiconductor are the second connection end of the first switch circuit.
9. power-on and power-off sequencing circuit as described in claim 1, which is characterized in that the signal shielding circuit is the second electricity
The controlled end of sub switch, second electronic switch is connect with the output end of the voltage comparator circuit, second electronic cutting
The first connecting pin closed is connect with the controlled end of the first switch circuit, and the second connection end of second electronic switch connects
Ground.
10. a kind of electronic equipment, which is characterized in that including power-on and power-off sequential control as claimed in any one of claims 1 to 9
Circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821870398.4U CN209046523U (en) | 2018-11-13 | 2018-11-13 | Power-on and power-off sequencing circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821870398.4U CN209046523U (en) | 2018-11-13 | 2018-11-13 | Power-on and power-off sequencing circuit and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN209046523U true CN209046523U (en) | 2019-06-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821870398.4U Active CN209046523U (en) | 2018-11-13 | 2018-11-13 | Power-on and power-off sequencing circuit and electronic equipment |
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| CN (1) | CN209046523U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114295965A (en) * | 2022-01-06 | 2022-04-08 | 上海御渡半导体科技有限公司 | Power-on and power-off method of programmable device power supply |
-
2018
- 2018-11-13 CN CN201821870398.4U patent/CN209046523U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114295965A (en) * | 2022-01-06 | 2022-04-08 | 上海御渡半导体科技有限公司 | Power-on and power-off method of programmable device power supply |
| CN114295965B (en) * | 2022-01-06 | 2024-01-16 | 上海御渡半导体科技有限公司 | Power-on and power-off method for programmable device power supply |
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