CN208656638U - A kind of veneer circuit system - Google Patents
A kind of veneer circuit system Download PDFInfo
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- CN208656638U CN208656638U CN201820926552.9U CN201820926552U CN208656638U CN 208656638 U CN208656638 U CN 208656638U CN 201820926552 U CN201820926552 U CN 201820926552U CN 208656638 U CN208656638 U CN 208656638U
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Abstract
The utility model discloses a kind of veneer circuit system, the veneer circuit system includes voltage detecting circuit, slow powers on fast lower electric circuit, leadage circuit.In the utility model embodiment, voltage detecting circuit detects power-supply fluctuation, when the voltage of voltage input end input is greater than preset first threshold, control is slow to power on fast lower electric circuit charging, voltage be less than preset third threshold value when, control leadage circuit release the first converter output voltage；When voltage is greater than preset four threshold value, controls each road power supply and re-power.When the voltage of voltage input end input is less than preset second threshold, control is slow to power on fast lower electric circuit discharging, so that leadage circuit be made to release the voltage of the first converter output.It can be set by setting third threshold value and let out electric time span, to guarantee to let out electricity completely, preset third threshold value is less than preset 4th threshold value, therefore powers on again after can guaranteeing to let out electricity completely, and guarantee electrifying timing sequence is correct, enables the chip to work normally.
Description
Technical field
The utility model relates to circuit field more particularly to a kind of veneer circuit systems.
Background technique
Veneer circuit system structure is as shown in Figure 1, include a main power source and other each road power supplys, the main power source in Fig. 1
It exports 12V voltage and gives veneer circuit system, other each road power supplys export 3.3V, the voltages such as 1.8V, 1.2V respectively.12V voltage passes
The defeated input terminal to the first converter, and it is connected to by electric resistance partial pressure the EN pin of the first converter, lead to
It crosses the first converter and 12V voltage is converted into 5V, the input terminal of 5V voltage transmission to the second converter, and
By the EN pin of RC circuit transmission to the second converter, by the second converter be converted to 3.3V, 1.8V,
1.2V etc. powers to segment chip.Wherein, when the voltage of the EN pin of converter reaches certain voltage value,
Converter is just able to achieve the conversion of voltage.
In the operation of veneer circuit system, usually multiple power supplys are a chip power supply, when multiple power supplys are according to setting
Time sequencing be chip power when, chip could work normally.It, may if the main power source of veneer circuit system fluctuates
It when will cause electric incomplete under the power supply of the road veneer circuit system Zhong Ge, re-powers, this timing that will result in as chip power supply
Entanglement leads to chip cisco unity malfunction.
In the prior art in order to solve the problem of that the timing entanglement of chip power supply leads to chip cisco unity malfunction, generally
It is the addition micro-control unit MCU in veneer circuit system.MCU is communicated with the chip in veneer circuit system, is served as and is seen
The effect of door dog.When MCU detects chip cisco unity malfunction, control main power source stopping is re-powered, and continues to test chip
Whether recovery works normally.
Problem of the existing technology is that MCU is added in veneer circuit system, will increase the complexity of veneer circuit system
Degree, occupy the hardware interface resources of master control, once and the program in MCU there is mistake, then can not to chip power timing
The problem of being controlled, will also result in chip cisco unity malfunction.
Utility model content
The utility model embodiment provides a kind of veneer circuit system, leads to solve to the timing entanglement that chip is powered
The problem of causing chip cisco unity malfunction.
The utility model embodiment provides a kind of veneer circuit system, and the veneer circuit system includes the first high-low pressure
The input terminal of converter, the second converter and RC circuit, first converter is connect with voltage input end,
The output end of first converter is connect with the input terminal of the second converter, and passes through RC circuit and the second height
The EN pin of pressure converter connects, and the veneer circuit system further includes voltage detecting circuit, slow power on fast lower electric circuit, releases
Circuit；
The first end of the voltage detecting circuit is connect with voltage input end, second end and described slow powers on fast lower electric circuit
Connection；The voltage detecting circuit is used to receive the voltage value of voltage input end input, if it is pre- to detect that the voltage value is greater than
If first threshold, slow power on fast lower electric circuit to described and send first control signal；If it is pre- to detect that the voltage value is less than
If second threshold, slow power on fast lower electric circuit to described and send second control signal；
The slow first end for powering on fast lower electric circuit is connect with voltage input end, and second end and the leadage circuit connect
It connects, third end is connect with the EN pin of first converter；It is described slow to power on fast lower electric circuit for receiving the
When one control signal, itself charging, when receiving second control signal, self-discharge；If the slow third for powering on fast lower electric circuit
It holds voltage to be less than preset third threshold value, controls first converter and do not work, and sent to the leadage circuit
Third controls signal；If the slow third end voltage for powering on fast lower electric circuit is greater than preset third threshold value and less than the 4th threshold value,
It controls first converter not work, and sends the 4th control signal to the leadage circuit；If delaying under powering on fastly
The third end voltage of circuit is greater than preset 4th threshold value, controls the first converter work, and let out to described
Discharge the 5th control signal of road transmission；
The first end of the leadage circuit is connect with voltage input end, the output end of second end and the first converter
Connection；If the leadage circuit is grounded the output end of the first converter for receiving third control signal；If connecing
The 4th control signal is received, the output end of the first converter and ground are disconnected；If receiving the 5th control signal, keep
The output end and ground of first converter disconnect.
Further, the voltage detecting circuit includes first resistor, second resistance, 3rd resistor and first switch；Institute
The first end for stating first resistor and second resistance is connect with voltage input end respectively；The second end of first resistor is electric with third respectively
The first end of resistance is connected with the first end of first switch；The second end of 3rd resistor and the second end of first switch are grounded respectively；
The second end of second resistance and the third end of first switch connect；
The slow lower electric circuit fastly that powers on includes the 4th resistance, the 5th resistance, the 6th resistance, capacitor and second switch；Institute
The first end for stating the 4th resistance is connect with voltage input end, second end respectively with the third end of second switch, capacitor first end,
The first end of 5th resistance connects；The first end of second switch is connect with the third end of the first switch；The of second switch
The second end of two ends and capacitor is grounded respectively；The second end of 5th resistance respectively with the first end and the first high-low pressure of the 6th resistance
The EN pin of converter connects, the second end ground connection of the 6th resistance；
The leadage circuit includes the 7th resistance, the 8th resistance, third switch and the 4th switch；The first end of 7th resistance
It is connect with voltage input end, the second end of the 7th resistance is connect with the first end at the third end of third switch, the 4th switch respectively；
The first end of third switch is connect with the first end of the capacitor, the second end ground connection of third switch；The first end of 8th resistance
It is connect with the output end of the first converter, the first end of the 8th resistance is connect with the third end of the 4th switch, and the 4th opens
The second end of pass is grounded.
Further, the veneer circuit system further includes third converter, the 9th resistance and the 5th switch；
The output end of second converter is connect with the input terminal of third converter, and passes through RC
Circuit is connect with the EN pin of third converter；The first end and second converter of 9th resistance
Output end connection, the second end of the 9th resistance with the 5th switch third end connect；The first end and the of 5th switch
The third end connection of three switches, the second end ground connection of the 5th switch.
Further, the first switch is triode, and the first end of the first switch is the base stage of triode, described
The second end of first switch is the emitter of triode, and the third end of the first switch is the collector of triode.
Further, the second switch, third switch, the 4th switch are respectively metal-oxide-semiconductor, the second switch, third
The first end that switch, the 4th switch is respectively the grid of metal-oxide-semiconductor, the second end of the second switch, third switch, the 4th switch
The respectively source electrode of metal-oxide-semiconductor, the third end that the second switch, third switch, the 4th switch are respectively the drain electrode of metal-oxide-semiconductor.
Further, the 5th switch is metal-oxide-semiconductor, and the first end of the 5th switch is the grid of metal-oxide-semiconductor, described the
The second end of five switches is the source electrode of metal-oxide-semiconductor, and the third end of the 5th switch is the drain electrode of metal-oxide-semiconductor.
The utility model embodiment provides a kind of veneer circuit system, and the veneer circuit system includes the first high-low pressure
The input terminal of converter, the second converter and RC circuit, first converter is connect with voltage input end,
The output end of first converter is connect with the input terminal of the second converter, and passes through RC circuit and the second height
The EN pin of pressure converter connects, and the veneer circuit system further includes voltage detecting circuit, slow power on fast lower electric circuit, releases
Circuit；The first end of the voltage detecting circuit is connect with voltage input end, and second end and the slow lower electric circuit fastly that powers on connect
It connects；The voltage detecting circuit is used to receive the voltage value of voltage input end input, if it is default to detect that the voltage value is greater than
First threshold, slow power on fast lower electric circuit to described and send first control signal；If it is default to detect that the voltage value is less than
Second threshold, slow power on fast lower electric circuit to described and send second control signal；Slow power on descends the first of electric circuit fastly
End is connect with voltage input end, and second end is connect with the leadage circuit, the EN at third end and first converter
Pin connection；It is described slow to power on fast lower electric circuit for when receiving first control signal, itself charging to receive the second control
When signal, self-discharge；If the slow third end voltage for powering on fast lower electric circuit is less than preset third threshold value, control described first
Converter does not work, and sends third to the leadage circuit and control signal；If the slow third for powering on fast lower electric circuit
It holds voltage to be greater than preset third threshold value and less than the 4th threshold value, controls first converter and do not work, and to institute
It states leadage circuit and sends the 4th control signal；If the slow third end voltage for powering on fast lower electric circuit is greater than preset 4th threshold value,
The first converter work is controlled, and sends the 5th control signal to the leadage circuit；The leadage circuit
First end is connect with voltage input end, and second end is connect with the output end of the first converter；The leadage circuit is used for
If receiving third control signal, it is grounded the output end of the first converter；If receiving the 4th control signal, make the
The output end and ground of one converter disconnect；If receiving the 5th control signal, the defeated of the first converter is kept
Outlet and ground disconnect.
Since in the utility model embodiment, voltage detecting circuit can detecte power-supply fluctuation, and defeated in voltage
When entering the voltage of end input greater than preset first threshold, control is slow to power on fast lower electricity circuit charging, and charging process voltage is slow
Rise, when the slow third end voltage for powering on fast lower electric circuit is less than preset third threshold value, control leadage circuit releases first
The voltage of converter output；When the slow third end voltage for powering on fast lower electric circuit is greater than preset four threshold value, control
Each road power supply re-powers.When the voltage of voltage input end input is less than preset second threshold, control is slow to power on fast lower electricity
Circuit discharging makes the slow voltage for powering on fast lower electric circuit be less than preset third threshold value quickly, keeps the first converter vertical
Stop working, at the same make leadage circuit release the first converter output voltage.It can be with by setting third threshold value
Electric time span is let out in setting, to guarantee to let out electricity completely, is powered on again after letting out electricity completely, is guaranteed the correct of electrifying timing sequence, make chip
It can work normally.
Detailed description of the invention
It, below will be to required in embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used is briefly introduced, it should be apparent that, the accompanying drawings in the following description is only some implementations of the utility model
Example, for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is veneer circuit system structure schematic diagram in the prior art；
Fig. 2 is the veneer circuit system structure schematic diagram that the utility model embodiment 1 provides；
Fig. 3 is the veneer circuit system structure schematic diagram that the utility model embodiment 2 provides；
Fig. 4 is the veneer circuit system structure schematic diagram that the utility model embodiment 3 provides；
Fig. 5 is the waveform diagram of voltage change in veneer circuit system provided by the embodiment of the utility model.
Specific embodiment
The utility model is described in further detail below in conjunction with attached drawing, it is clear that described embodiment is only
It is the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, this field is general
Logical technical staff all other embodiment obtained without making creative work belongs to the utility model guarantor
The range of shield.
Embodiment 1:
Fig. 2 is a kind of veneer circuit system structure schematic diagram provided by the embodiment of the utility model；Veneer circuit system
System includes the first converter 11, the second converter 12 and RC circuit 13, first converter 11
Input terminal connect with voltage input end, the output end of the first converter 11 is defeated with the second converter 12
Enter end connection, and connect by RC circuit 13 with the EN pin of the second converter 12, the veneer circuit system is also wrapped
Include voltage detecting circuit 14, slow power on descends electric circuit 15, leadage circuit 16 fastly；
The first end of the voltage detecting circuit 14 is connect with voltage input end, second end and described slow powers on fast lower electricity electricity
Road 15 connects；The voltage detecting circuit 14 is used to receive the voltage value of voltage input end input, if detecting the voltage value
Greater than preset first threshold, first control signal is sent to the slow lower electric circuit 15 fastly that powers on；If detecting the voltage
Value is less than preset second threshold, sends second control signal to the slow lower electric circuit 15 fastly that powers on；
The slow first end for powering on fast lower electric circuit 15 is connect with voltage input end, second end and the leadage circuit 16
Connection, third end is connect with the EN pin of first converter 11；The slow lower electric circuit 15 fastly that powers on is used to connect
When receiving first control signal, itself charging, when receiving second control signal, self-discharge；If slow power on fast lower electric circuit
15 third end voltage is less than preset third threshold value, controls first converter 11 and does not work, and lets out to described
The transmission third of road 16 of discharging controls signal；If the slow third end voltage for powering on fast lower electric circuit 15 be greater than preset third threshold value and
It less than the 4th threshold value, controls first converter 11 and does not work, and send the 4th control to the leadage circuit 16
Signal；If the slow third end voltage for powering on fast lower electric circuit 15 is greater than preset 4th threshold value, controls first high-low pressure and turn
Parallel operation 11 works, and sends the 5th control signal to the leadage circuit 16；
The first end of the leadage circuit 16 is connect with voltage input end, and second end is defeated with the first converter 11
Outlet connection；If the leadage circuit 16 makes the output end of the first converter 11 for receiving third control signal
Ground connection；If receiving the 4th control signal, disconnect the output end of the first converter 11 and ground；If receiving the 5th
Signal is controlled, the output end of the first converter 11 and ground is kept to disconnect.
In veneer circuit system schematic diagram shown in Fig. 2, first converter 11 and three are shown
The input terminal of two converters 12, the first converter 11 is connect with voltage input end, the first converter
11 output end is connect with the input terminal of three the second converters 12, and passes through RC circuit 13 and three the second high-low pressures
The EN pin of converter 12 connects.Chip generally has the requirement of electrifying timing sequence, for the timing of several ms intervals, by veneer electricity
The EN pin of corresponding second converter 12 of 13 delays time to control of RC circuit in the system of road is realized.
In the utility model embodiment, veneer circuit system further includes voltage detecting circuit 14, slow powers on fast lower electricity electricity
Road 15 and leadage circuit 16.The first end of voltage detecting circuit 14 is connect with voltage input end, and second end powers on fast lower electricity with slow
Circuit 15 connects.Voltage detecting circuit 14 can detect power-supply fluctuation according to the voltage value of voltage input end.Occur in power supply
When fluctuation, the voltage value of power supply output becomes larger, and the voltage value of voltage input end becomes larger, and the voltage value of power supply output becomes smaller, voltage
The voltage value of input terminal becomes smaller.Voltage detecting circuit 14 detects that the voltage value of voltage input end input is greater than preset first threshold
Value sends first control signal to the slow lower electric circuit 15 fastly that powers on；It is default to detect that the voltage value of voltage input end input is less than
Second threshold, power on fast lower electric circuit 15 to slow and send second control signal.Wherein, preset first threshold and preset
Two threshold values can be the same or different.By taking 12V equipment as an example, due to the work threshold value of most of 12V equipment be 12V ±
30%, that is to say, that 12V equipment does not just work in 8V or less.Therefore preset first threshold and preset second threshold can be with
It is identical, it is 7V.Certainly, preset first threshold and preset second threshold can also be different, such as preset first threshold is
7.5V, preset second threshold are 6.8V etc..
The slow first end for powering on fast lower electric circuit 15 is connect with voltage input end, and second end is connect with leadage circuit 16, the
Three ends are connect with the EN pin of the first converter 11, and the slow lower electric circuit 15 fastly that powers on receives voltage detecting circuit 14
When the first control signal of transmission, itself charging, when receiving the second control signal of the transmission of voltage detecting circuit 14, itself is put
Electricity.
If the slow third end voltage for powering on fast lower electric circuit 15 is less than preset third threshold value, the first high-low pressure of control turns
Parallel operation 11 does not work, that is, controls the first converter 11 and convert without voltage, the first converter 11
Cannot output voltage, and third is sent to leadage circuit 16 by the slow second end for powering on fast lower electric circuit 15 and controls signal；
If the slow third end voltage for powering on fast lower electric circuit 15 is greater than preset third threshold value and is less than preset 4th threshold value, control
First converter 11 does not work, that is, controls the first converter 11 and convert without voltage, the first height
Pressure converter 11 also cannot output voltage, and sent by the slow second end for powering on fast lower electric circuit 15 to leadage circuit 16
4th control signal；If the slow third end voltage for powering on fast lower electric circuit 15 is greater than preset 4th threshold value, control first is high
Low voltage converter 11 works, that is, controls the first converter 11 and carry out voltage conversion, the first converter 11
Can be with output voltage, and the 5th control signal is sent to the leadage circuit.Wherein, preset third threshold value can be 1V,
1.2V etc., preset 4th threshold value can be 1.5V, 2V etc..
The first end of leadage circuit 16 is connect with voltage input end, the output of second end and the first converter 11
End connection is grounded the output end of the first converter 11, releases when leadage circuit 16 receives third control signal
First converter 11 is output to the voltage of the second converter 12；If receiving the 4th control signal, make first
The output end and ground of converter 11 disconnect, and stop discharge voltage；If receiving the 5th control signal, the first height is kept
The output end and ground of pressure converter 11 disconnect.
Since in the utility model embodiment, voltage detecting circuit 14 can detecte power-supply fluctuation, and in voltage
When the voltage of input terminal input is greater than preset first threshold, the slow lower electric circuit 15 fastly that powers on of control charges, charging process voltage
Slowly rise, when the slow third end voltage for powering on fast lower electric circuit is less than preset third threshold value, control leadage circuit 16 is released
The voltage of first converter output；The slow third end voltage for powering on fast lower electric circuit 15 is greater than preset 4th threshold value
When, it controls each road power supply and re-powers.When the voltage of voltage input end input is less than preset second threshold, control is slow to be powered on
Fast lower electric circuit 15 discharges, and so that the slow voltage for powering on fast lower electric circuit 15 is less than preset third threshold value quickly, makes the first height
Pressure converter 11 stops working immediately, at the same make leadage circuit 16 release the first converter output voltage.By setting
Set third threshold value and can be set and let out electric time span, thus guarantee to let out it is electric completely, let out it is electric completely after power on again, guarantee electrifying timing sequence
It is correct, enable the chip to work normally.
Embodiment 2:
Fig. 3 is veneer circuit system structure schematic diagram provided by the embodiment of the utility model；Veneer circuit as shown in Figure 3
System, the voltage detecting circuit 14 include first resistor R1, second resistance R2,3rd resistor R3 and first switch Q1；It is described
The first end of first resistor R1 and second resistance R2 are connect with voltage input end respectively；The second end of first resistor R1 is respectively with
The first end of three resistance R3 is connected with the first end of first switch Q1；The second of the second end of 3rd resistor R3 and first switch Q1
End is grounded respectively；The second end of second resistance R2 is connect with the third end of first switch Q1；
It is described that slow to power on fast lower electric circuit 15 include the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, capacitor C and the
Two switch M2；The first end of the 4th resistance R4 is connect with voltage input end, the second end third with second switch M2 respectively
End, the first end of capacitor C, the connection of the first end of the 5th resistance R5；The first end of second switch M2 is with the first switch Q1's
The connection of third end；The second end of second switch M2 and the second end of capacitor C are grounded respectively；The second end of 5th resistance R5 is distinguished
It is connect with the EN pin of the first end of the 6th resistance R6 and the first converter 11, the second end ground connection of the 6th resistance R6；
The leadage circuit 16 includes the 7th resistance R7, the 8th resistance R8, third switch M3 and the 4th switch M4；7th electricity
Resistance R7 first end connect with voltage input end, the second end of the 7th resistance R7 respectively with the third end of third switch M3, the 4th
The first end of switch M4 connects；The first end of third switch M3 is connect with the first end of the capacitor C, and the second of third switch M3
End ground connection；The first end of 8th resistance R8 is connect with the output end of the first converter 11, the first end of the 8th resistance R8
It is connect with the third end of the 4th switch M4, the second end ground connection of the 4th switch M4.
Veneer circuit system as shown in Figure 3, due to power-supply fluctuation, when the voltage of voltage input end output increases in default
First threshold when, the first end electric current of first switch Q1 is greater than the threshold value of first switch Q1 closure, controls first switch Q1
Second end and the conducting of third end, the third end ground connection of first switch Q1, thus the third end of first switch Q1 to it is slow power on it is fast
The first control signal of the first end output of second switch M2 in lower electricity circuit 15 is low voltage signal.The of second switch M2
One end voltage is less than the threshold value of second switch M2 closure, therefore the second end of second switch M2 and third end disconnect, electric at this time
Press input terminal for capacitor C charging, capacitor C voltage slowly rises.The connecting pin of 5th resistance R5 and the 6th resistance R6, that is, with
The voltage of the connecting pin of the EN pin of first converter 11 slowly rises, since the EN of the first converter 11 is managed
When the voltage value of foot is greater than four threshold values, the first converter 11 could be worked normally, therefore be turned with the first high-low pressure
When the voltage of the connecting pin of the EN pin of parallel operation 11 is less than preset third threshold value, the first converter 11 does not work,
It is exactly the first converter 11 not output voltage values.Also, delays power on the third control that fast lower electric circuit 15 exports at this time
Signal is low voltage signal, and third switch M3 is disconnected at this time, the 4th switch M4 closure, the output end of the first converter 11
Ground connection, the voltage of the first converter 11 of releasing at this time output.
It is that the voltage of the EN pin of the first converter 11 is greater than preset third threshold value and is less than preset the
When four threshold values, the first converter 11 does not work.Also, delays power on the four control signals that fast lower electric circuit 15 exports at this time
For high voltage signal, third switch M3 is closed at this time, and the 4th switch M4 is disconnected, the output end of the first converter 11 and
Ground disconnects, and stops the output voltage of the first converter 11 of releasing at this time.
When voltage in the connecting pin of the EN pin with the first converter 11 is greater than preset four threshold value, first
Converter 11 works, and the first converter 11 can be with output voltage.Remaining mains are released and are finished on veneer at this time,
First converter, 11 output voltage is successively powered to the second converter 12 of rear class.
Due to power-supply fluctuation, when the voltage of voltage input end output is less than preset second threshold, first switch Q1's
First end electric current is less than the threshold value of first switch Q1 closure, and control first switch Q1 is disconnected, at this time the third of first switch Q1
Holding the second control signal exported to the slow first end for powering on the second switch M2 in fast lower electric circuit 15 is high voltage signal.The
The first end voltage of two switch M2 is greater than the threshold value of second switch M2 closure, therefore the second end and third of second switch M2
End closure, capacitor C is discharged by second switch M2 at this time, and capacitor C voltage drops to 0 in 100 microseconds.5th resistance R5 and the 6th
The connecting pin of resistance R6, that is, with the voltage value of the connecting pin of the EN pin of the first converter 11 less than the 4th threshold
Value, the first converter 11 do not work, that is, the first converter 11 not output voltage values.Also, delay at this time
Powering on the third control signal that fast lower electric circuit 15 exports is low voltage signal, and third switch M3 is disconnected at this time, the 4th switch M4
Closure, the output end ground connection of the first converter 11, the voltage of the first converter 11 of releasing at this time output.
In the utility model embodiment, generally in 12V equipment, the threshold value of the first converter work is
The threshold value of 1.2V or so, third switch M3 closure is 1V or so, lets out electricity in order to prevent and the power supply of the first converter is same
When work, joined the 5th resistance R5 in the veneer circuit system of the utility model, acted on by the partial pressure of the 5th resistance R5,
It can be worked at the same time to avoid electricity and the power supply of the first converter is let out.
In the utility model embodiment, the first switch Q1 is triode, and the first end of the first switch Q1 is
The base stage of triode, the second end of the first switch are the emitter of triode, and the third end of the first switch is three poles
The collector of pipe.Certainly, the first switch Q1 is not limited to triode, as long as on-off can be carried out in power-supply fluctuation
Can, such as be also possible to reference voltage source chip etc..
The second switch M2, third switch M3, the 4th switch M4 are respectively metal-oxide-semiconductor, and the second switch M2, third are opened
Close M3, the 4th switch M4 first end be respectively the grid of metal-oxide-semiconductor, the second switch, third switch, the 4th switch second
End is respectively the source electrode of metal-oxide-semiconductor, and the third end that the second switch, third switch, the 4th switch is respectively the drain electrode of metal-oxide-semiconductor.
Certainly, the second switch M2, third switch M3, the 4th switch M4 are not limited to metal-oxide-semiconductor, are also possible to similar metal-oxide-semiconductor
Voltage-controlled device etc..In veneer circuit system shown in Fig. 3, first switch Q1 is triode, second switch M2, third switch
M3, the 4th switch M4 are respectively metal-oxide-semiconductor.The voltage of voltage input end output is 12V, and the first converter 11 turns for 12V
5V, three the second converters 12 are respectively that 5V turns that 3.3V, 5V turn 1.8V and 5V turns 1.2V.
In the utility model embodiment, when power-supply fluctuation, if the voltage of voltage input end input is greater than preset the
One threshold value, capacitor C charge, and are less than in charging process with the voltage of the connecting pin of the EN pin of the first converter 11 and preset
Third threshold value when, the first converter 11 does not work, leadage circuit release the first converter 11 output electricity
Pressure；When the voltage of the EN pin of first converter 11 is greater than preset third threshold value and is less than preset four threshold value,
First converter 11 does not work, leadage circuit stop release the first converter 11 output voltage；First is high
When the voltage of the EN pin of low voltage converter 11 is greater than preset four threshold value, the work of the first converter 11.If electric
The voltage of input terminal input is pressed to be less than preset second threshold, capacitor C electric discharge, with the EN pin of the first converter 11
The voltage value of connecting pin is less than third threshold value, and the first converter 11 do not work, and leadage circuit the first high-low pressure of releasing turns
The voltage that parallel operation 11 exports.It can be set by setting third threshold value and let out electric time span, to guarantee to let out electricity completely, it is complete to let out electricity
Quan Houzai is powered on, and guarantees the correct of electrifying timing sequence, enables the chip to work normally.
Embodiment 3:
It further include third converter in some veneer circuit systems, Fig. 4 is provided by the embodiment of the utility model
A kind of veneer circuit system structure schematic diagram, the veneer circuit system further include third converter 17, the 9th resistance
R9 and the 5th switch M5；
The output end of second converter 12 is connect with the input terminal of third converter 17, and is led to
RC circuit 13 is crossed to connect with the EN pin of third converter 17；The first end of the 9th resistance R9 and described second high
The output end of low voltage converter 12 connects, and the second end of the 9th resistance R9 is connect with the third end of the 5th switch M5；5th
The first end of switch M5 is connect with the third end of third switch M3, the second end ground connection of the 5th switch M5.
Veneer circuit system as shown in Figure 4, due to power-supply fluctuation, when the voltage of voltage input end output increases in default
First threshold when, the first end electric current of first switch Q1 is greater than the threshold value of first switch Q1 closure, controls first switch Q1
Second end and the conducting of third end, the third end ground connection of first switch Q1, thus the third end of first switch Q1 to it is slow power on it is fast
The first control signal of the first end output of second switch M2 in lower electricity circuit 15 is low voltage signal.The of second switch M2
One end voltage is less than the threshold value of second switch M2 closure, therefore the second end of second switch M2 and third end disconnect, electric at this time
Press input terminal for capacitor C charging, capacitor C voltage slowly rises.The connecting pin of 5th resistance R5 and the 6th resistance R6, that is, with
The voltage of the connecting pin of the EN pin of first converter 11 slowly rises, since the EN of the first converter 11 is managed
When the voltage value of foot is greater than four threshold values, the first converter 11 could be worked normally, therefore be turned with the first high-low pressure
When the voltage of the connecting pin of the EN pin of parallel operation 11 is less than preset third threshold value, the first converter 11 does not work,
It is exactly the first converter 11 not output voltage values.Also, delays power on the third control that fast lower electric circuit 15 exports at this time
Signal is low voltage signal, and third switch M3 is disconnected at this time, the 5th switch M5 closure, the output end of the second converter 12
Ground connection, the voltage of the second converter 12 of releasing at this time output.
It is greater than preset third threshold value in the voltage of the EN pin with the first converter 11 and is less than preset the
When four threshold values, the first converter 11 does not work.And delays power on the 4th control signal that fast lower electric circuit 15 exports at this time
For high voltage signal, third switch M3 is closed at this time, and the 5th switch M5 is disconnected, the output end of the second converter 12 and
Ground disconnect, at this time stop release the second converter 12 output voltage.
When voltage in the connecting pin of the EN pin with the first converter 11 is greater than preset four threshold value, first
Converter 11 works, and the first converter 11 can be with output voltage.Remaining mains are released and are finished on veneer at this time,
First converter, 11 output voltage is successively powered to the second converter 12 of rear class, the second converter
12 output voltages are successively powered to the third converter 17 of rear class.
Due to power-supply fluctuation, when the voltage of voltage input end output is less than preset second threshold, first switch Q1's
First end electric current is less than the threshold value of first switch Q1 closure, and control first switch Q1 is disconnected, at this time the third of first switch Q1
Holding the second control signal exported to the slow first end for powering on the second switch M2 in fast lower electric circuit 15 is high voltage signal.The
The first end voltage of two switch M2 is greater than the threshold value of second switch M2 closure, therefore the second end and third of second switch M2
End closure, capacitor C is discharged by second switch M2 at this time, and capacitor C voltage drops to 0 in 100 microseconds.5th resistance R5 and the 6th
The connecting pin of resistance R6, that is, with the voltage value of the connecting pin of the EN pin of the first converter 11 less than the 4th threshold
Value, the first converter 11 do not work, that is, the first converter 11 not output voltage values.Also, delay at this time
Powering on the third control signal that fast lower electric circuit 15 exports is low voltage signal, and third switch M3 is disconnected at this time, the 5th switch M5
Closure, the output end ground connection of the second converter 12, the voltage of the second converter 12 of releasing at this time output.
In the utility model embodiment, the 5th switch M5 is metal-oxide-semiconductor, and the first end of the 5th switch M5 is
The grid of metal-oxide-semiconductor, the second end of the 5th switch M5 are the source electrode of metal-oxide-semiconductor, and the third end of the 5th switch M5 is metal-oxide-semiconductor
Drain electrode.Certainly, the 5th switch M5 is not limited to metal-oxide-semiconductor, is also possible to the voltage-controlled device etc. of similar metal-oxide-semiconductor.
In veneer circuit system shown in Fig. 4, the 5th switch M5 is metal-oxide-semiconductor.In Fig. 4, voltage input end output
Voltage is 12V, and the first converter 11 is that 12V turns 5V, and three the second converters 12 are respectively that 5V turns 3.3V, 5V
Turn 1.8V and 5V turns 1.2V.Three third converters 17 respectively 3.3V turns 1.5V, 3.3V and turns 1.1V and 3.3V turns
1.05V。
In the utility model embodiment, when power-supply fluctuation, if the voltage of voltage input end input is greater than preset the
One threshold value, capacitor C charge, and are less than in charging process with the voltage of the connecting pin of the EN pin of the first converter 11 and preset
Third threshold value when, the first converter 11 does not work, leadage circuit release the first converter 11 output electricity
Pressure；When the voltage of the EN pin of first converter 11 is greater than preset third threshold value and is less than preset four threshold value,
First converter 11 does not work, leadage circuit stop release the first converter 11 output voltage；First is high
When the voltage of the EN pin of low voltage converter 11 is greater than preset four threshold value, the work of the first converter 11.If electric
The voltage of input terminal input is pressed to be less than preset second threshold, capacitor C electric discharge, with the EN pin of the first converter 11
The voltage value of connecting pin is less than third threshold value, and the first converter 11 do not work, and leadage circuit the first high-low pressure of releasing turns
The voltage of voltage and the output of the second converter 12 that parallel operation 11 exports.It can be set by setting third threshold value and let out electricity
Time span powers on again after letting out electricity completely to guarantee to let out electricity completely, guarantees the correct of electrifying timing sequence, enables the chip to normal
Work.
In the utility model embodiment, preset first threshold and preset second threshold are by first resistor R1 and
Three resistance R3 are determined.The EN pin for reaching the first converter 11 opens threshold value, that is, preset 4th threshold value
Time is determined by the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and capacitor C.The EN pin of first converter 11
The variation of voltage value is determined by the 4th resistance R4, the 5th resistance R5 and the 6th resistance R6.Preset third threshold value is switched by third
The threshold value of M3 closure determines.
Fig. 5 is the waveform diagram of voltage change in veneer circuit system provided by the embodiment of the utility model.Scheming
In 5, preset first threshold is identical as preset second threshold, as shown in figure 5, after device power, voltage input end input
When voltage is greater than preset first threshold, the voltage of the EN pin of the first converter slowly rises, and high first
When the voltage of the EN pin of low voltage converter reaches preset four threshold value, the first converter exports 5V voltage, due to
When the voltage of power-supply fluctuation, voltage input end input is less than preset second threshold, the EN pin of the first converter
Voltage is quickly reduced to 0, the 5V voltage of the first converter of releasing at this time output, as shown in figure 5, in t2 time span
It is interior, it is constantly in and lets out electricity condition, by t1 time span, the voltage of the EN pin of the first converter reaches pre- again
If the 4th threshold value, the first converter exports 5V voltage again.It can be set by setting third threshold value and let out the electric time
Length to guarantee to let out electricity completely, therefore powers on again after can guaranteeing to let out electricity completely, guarantees the correct of electrifying timing sequence, make chip
It can work normally.As shown in figure 5, do not arrive t2 time span also, and when just having let out electricity completely, therefore having re-powered, Neng Goubao
The correct of electrifying timing sequence is demonstrate,proved, enables the chip to work normally.
In addition, veneer circuit system structure provided by the embodiment of the utility model is simple, can be avoided in the prior art by
There is mistake in MCU program, leads to not control the timing that chip is powered, cause asking for chip cisco unity malfunction
Topic, is communicated due to not needing MCU with the chip in veneer circuit system, also be can reduce and is occupied veneer circuit system
I/O resource, dependable with function with higher.
Although the preferred embodiment of the utility model has been described, once a person skilled in the art knows basic
Creative concept, then additional changes and modifications may be made to these embodiments.It is wrapped so the following claims are intended to be interpreted as
It includes preferred embodiment and falls into all change and modification of the scope of the utility model.
Obviously, it is practical without departing from this can to carry out various modification and variations to the utility model by those skilled in the art
Novel spirit and scope.If in this way, these modifications and variations of the present invention belong to the utility model claims and
Within the scope of its equivalent technologies, then the utility model is also intended to include these modifications and variations.
Claims (6)
1. a kind of veneer circuit system, the veneer circuit system includes the first converter, the second converter
It is connect with the input terminal of RC circuit, first converter with voltage input end, the output of the first converter
End is connect with the input terminal of the second converter, and is connect by RC circuit with the EN pin of the second converter,
It is characterized in that, the veneer circuit system further includes voltage detecting circuit, slow powers on fast lower electric circuit, leadage circuit；
The first end of the voltage detecting circuit is connect with voltage input end, and second end and the slow lower electric circuit fastly that powers on connect
It connects；The voltage detecting circuit is used to receive the voltage value of voltage input end input, if it is default to detect that the voltage value is greater than
First threshold, slow power on fast lower electric circuit to described and send first control signal；If it is default to detect that the voltage value is less than
Second threshold, slow power on fast lower electric circuit to described and send second control signal；
The slow first end for powering on fast lower electric circuit is connect with voltage input end, and second end is connect with the leadage circuit, the
Three ends are connect with the EN pin of first converter；The slow lower electric circuit fastly that powers on is used to receive the first control
When signal, itself charging, when receiving second control signal, self-discharge；If the slow third end voltage for powering on fast lower electric circuit
It less than preset third threshold value, controls first converter and does not work, and send third control to the leadage circuit
Signal processed；If the slow third end voltage for powering on fast lower electric circuit is greater than preset third threshold value and less than the 4th threshold value, institute is controlled
It states the first converter not work, and sends the 4th control signal to the leadage circuit；If slow power on fast lower electric circuit
Third end voltage be greater than preset 4th threshold value, control first converter work, and to the leadage circuit
Send the 5th control signal；
The first end of the leadage circuit is connect with voltage input end, and the output end of second end and the first converter connects
It connects；If the leadage circuit is grounded the output end of the first converter for receiving third control signal；If receiving
To the 4th control signal, disconnect the output end of the first converter and ground；If receiving the 5th control signal, the is kept
The output end and ground of one converter disconnect.
2. veneer circuit system as described in claim 1, which is characterized in that the voltage detecting circuit include first resistor,
Second resistance, 3rd resistor and first switch；The first end of the first resistor and second resistance connects with voltage input end respectively
It connects；The second end of first resistor is connect with the first end of the first end of 3rd resistor and first switch respectively；The of 3rd resistor
The second end of two ends and first switch is grounded respectively；The second end of second resistance and the third end of first switch connect；
The slow lower electric circuit fastly that powers on includes the 4th resistance, the 5th resistance, the 6th resistance, capacitor and second switch；Described
The first end of four resistance is connect with voltage input end, second end respectively with the third end of second switch, the first end of capacitor, the 5th
The first end of resistance connects；The first end of second switch is connect with the third end of the first switch；The second end of second switch
It is grounded respectively with the second end of capacitor；The second end of 5th resistance is converted with the first end of the 6th resistance and the first high-low pressure respectively
The EN pin of device connects, the second end ground connection of the 6th resistance；
The leadage circuit includes the 7th resistance, the 8th resistance, third switch and the 4th switch；The first end and electricity of 7th resistance
Input terminal connection is pressed, the second end of the 7th resistance is connect with the first end at the third end of third switch, the 4th switch respectively；Third
The first end of switch is connect with the first end of the capacitor, the second end ground connection of third switch；The first end of 8th resistance and the
The output end of one converter connects, and the first end of the 8th resistance is connect with the third end of the 4th switch, the 4th switch
Second end ground connection.
3. veneer circuit system as claimed in claim 2, which is characterized in that the veneer circuit system further includes third height
Pressure converter, the 9th resistance and the 5th switch；
The output end of second converter is connect with the input terminal of third converter, and passes through RC circuit
It is connect with the EN pin of third converter；The first end of 9th resistance is defeated with second converter
Outlet connection, the second end of the 9th resistance are connect with the third end of the 5th switch；The first end of 5th switch is opened with third
The third end of pass connects, the second end ground connection of the 5th switch.
4. veneer circuit system as claimed in claim 2, which is characterized in that the first switch be triode, described first
The first end of switch is the base stage of triode, and the second end of the first switch is the emitter of triode, the first switch
Third end be triode collector.
5. veneer circuit system as claimed in claim 2, which is characterized in that the second switch, third switch, the 4th switch
Respectively metal-oxide-semiconductor, the second switch, third switch, the 4th switch first end be respectively metal-oxide-semiconductor grid, described second
The second end that switch, third switch, the 4th switch is respectively the source electrode of metal-oxide-semiconductor, and the second switch, third switch, the 4th open
The third end of pass is respectively the drain electrode of metal-oxide-semiconductor.
6. veneer circuit system as claimed in claim 3, which is characterized in that the 5th switch is metal-oxide-semiconductor, and the described 5th opens
The first end of pass is the grid of metal-oxide-semiconductor, and the second end of the 5th switch is the source electrode of metal-oxide-semiconductor, the third of the 5th switch
End is the drain electrode of metal-oxide-semiconductor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820926552.9U CN208656638U (en) | 2018-06-14 | 2018-06-14 | A kind of veneer circuit system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820926552.9U CN208656638U (en) | 2018-06-14 | 2018-06-14 | A kind of veneer circuit system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114221532A (en) * | 2021-12-16 | 2022-03-22 | 上海商米科技集团股份有限公司 | Discharging circuit, method and intelligent equipment |
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2018
- 2018-06-14 CN CN201820926552.9U patent/CN208656638U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114221532A (en) * | 2021-12-16 | 2022-03-22 | 上海商米科技集团股份有限公司 | Discharging circuit, method and intelligent equipment |
| CN114221532B (en) * | 2021-12-16 | 2024-04-09 | 上海商米科技集团股份有限公司 | Discharging circuit, method and intelligent device |
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