CN110531821A - Voltage-regulating circuit - Google Patents
Voltage-regulating circuit Download PDFInfo
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- CN110531821A CN110531821A CN201910922597.8A CN201910922597A CN110531821A CN 110531821 A CN110531821 A CN 110531821A CN 201910922597 A CN201910922597 A CN 201910922597A CN 110531821 A CN110531821 A CN 110531821A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/569—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection
- G05F1/571—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection with overvoltage detector
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/575—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices characterised by the feedback circuit
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Semiconductor Integrated Circuits (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
A kind of voltage-regulating circuit suitable for USB port includes the first partial pressure unit, switch, the second partial pressure unit, detection unit and vent unit.First partial pressure unit generates the first partial pressure according to the first voltage and second voltage of data pins.It switchs when first voltage is more than one threshold voltage of tertiary voltage, establishes the connection path between the first connecting pin and second connection end.Second partial pressure unit generates the second partial pressure according to tertiary voltage and second voltage.Detection unit judges whether the first partial pressure is greater than the second partial pressure, generates the first signal when the first partial pressure is greater than the second partial pressure.The data pins are connected to the connection between the second voltage in vent unit when receiving the first signal, drag down first voltage.
Description
Technical field
The present invention is about over-voltage protection technique, especially a kind of voltage-regulating circuit suitable for port.
Background technique
With the evolution of process technique, the size of component is reduced, but the pressure resistance of component also decreases.However,
Whether same pressure resistance is simultaneously with component in the first electronic device with the component in the second electronic device of the first electronic device communications
It not can control, or relative to second electronic device, the data of the first electronic device output accidentally have or must use larger
Voltage, such as when the data of the first electronic device output have the voltage of 3.3V or 5V, and the component of second electronic device is resistance to
It is 1.8V by voltage, then the data that the first electronic device can be made to be output to second electronic device shorten the second electronics with respect to over-voltage
The service life of device, therefore, for second electronic device, whether detecting communication port received data over-voltage and have been taken
Effect measure, which avoids burning out component when over-voltage just, seems quite important.
Summary of the invention
In one embodiment, a kind of voltage-regulating circuit suitable for communication port, including the first partial pressure unit, switch,
Second partial pressure unit, detection unit and vent unit.The data pins and second of first partial pressure unit coupling communication port
Voltage, to generate the first partial pressure according to the first voltage of the data pins and second voltage.The first end of switch couples data
Pin, the second end of switch couple tertiary voltage, when first voltage is more than one threshold voltage of tertiary voltage, establish first end with
Connection between second end.Second partial pressure unit couples tertiary voltage and second voltage, according to tertiary voltage and the second electricity
Pressure generates the second partial pressure.Detection unit couples the first partial pressure unit and the second partial pressure unit, receives the first partial pressure and second
Partial pressure, judges whether the first partial pressure is greater than the second partial pressure, the first signal is generated when the first partial pressure is greater than the second partial pressure, in first
Second signal is generated when partial pressure is less than the second partial pressure.Vent unit couples detection unit, data pins and second voltage, in connecing
Connection when receiving the first signal between conducting data pins and second voltage, truncated data pin when receiving second signal
Connection between second voltage.
Detailed description of the invention
Fig. 1 is the schematic diagram of voltage-regulating circuit 100 described in one embodiment of the invention.
Fig. 2A and Fig. 2 B is the schematic diagram that operating voltage generates unit 150 in Fig. 1.
Specific embodiment
To enable the above objects, features, and advantages of the embodiment of the present invention to be clearer and more comprehensible, hereafter cooperates attached drawing, make detailed
Carefully it is described as follows.
It will be appreciated that the use of the words such as "comprising", " comprising " being in this manual specific to indicate to exist
Technical characteristic, numerical value, operation processing, component and/or component, but be not precluded and can add more technical characteristics, numerical value, work
Industry processing, component, component or above any combination.
The words such as " first ", " second ", " third ", " the 4th " be for modifying component, not be used to indicate between priority
Or precedence relation, and be only used to distinguish the component with same name.
Fig. 1 is the schematic diagram of voltage-regulating circuit 100 described in one embodiment of the invention, and voltage protection circuit 100 can be with
Applied to communication port 200.Refering to fig. 1, voltage-regulating circuit 100 drags down when detecting the data over-voltage of communication port transfers
Data voltage is injured or is damaged to avoid over-voltage and arrives late-class circuit, wherein over-voltage refers to that the data voltage of communication port transfers is super
The situation of component pressure resistance in late-class circuit (not shown) out.In some embodiments, voltage-regulating circuit 100 is coupled to communication
The a certain pin of port 200 damages late-class circuit to avoid the over-voltage situation occurred on this pin.In some embodiments,
Voltage-regulating circuit 100, communication port 200 and late-class circuit are settings in second electronic device, and late-class circuit can be by logical
Letter port 200 is communicated with the first electronic device (not shown).In some embodiments, late-class circuit can pass through port 200
The communication carried out with the first electronic device, that is, data are transmitted, and be can be second electronic device to the first electronic device and are sent number
According to, be also possible to the first electronic device to second electronic device send data.
In some embodiments, communication port 200 can be universal serial bus (Universal Serial Bus, USB)
Port, voltage-regulating circuit 100 may be coupled to the data pins 210 of universal serial bus, for example, being coupled to universal serial bus
D+ signal position or D- signal position.
In one embodiment, voltage-regulating circuit 100 includes the first partial pressure unit 110, detection unit 120, vent unit
130, switch 140, operating voltage generate unit 150, the second partial pressure unit 160, local power supply unit 170 and potential shift list
Member 180.
First partial pressure unit 110 is coupled between first voltage V1 and second voltage VSS, 110 basis of the first partial pressure unit
First voltage V1 generates the first partial pressure V2, wherein first voltage V1 is the voltage for the data transmitted in data pins 210.One
In a little embodiments, second voltage VSS can be ground voltage GND, and the first partial pressure unit 110 can be converted directly according to first voltage V1
First partial pressure V2 out, but the present invention is not limited thereto.In further embodiments, second voltage VSS is not ground voltage, the
One partial pressure unit 110 can then obtain the first partial pressure V2 according to the voltage difference between first voltage V1 and second voltage VSS.Partial pressure is single
Member 110 includes first resistor 111 and second resistance 112.The first end of first resistor 111 couples data pins 210, first resistor
The first end of 111 second end coupling second resistance 112, the second end coupling second voltage VSS of second resistance 112, and first
Partial pressure V2 is the voltage between the second end of 3rd resistor 111 and the first end of the 4th resistance 112.
The tool of switch 140 is there are two connecting pin, referred to as the first connecting pin and second connection end individually below.Switch 140
First connecting pin is couple to data pins 210, to receive the first voltage V1 in data pins 210, the second connection of switch 140
The second partial pressure unit 160 of end coupling.Switch 140 compares the first voltage V1 of the first connecting pin and the 4th electricity of second connection end
Press V4.Wherein, when the difference of first voltage V1 and the 4th voltage V4 are less than the threshold voltage of switch 140, switch 140 is disconnected
Connection between its first connecting pin and second connection end.When the difference of first voltage V1 and the 4th voltage V4 are more than switch 140
Threshold voltage when, the connection between the first connecting pin and second connection end is connected in switch 140.In some embodiments, it switchs
140 can be realized with diode, threshold voltage, that is, diode conducting voltage, with the anode (P) of the diode and cathode (N)
Respectively above-mentioned first connecting pin and second connection end.
Second partial pressure unit 160 is coupled between the 4th voltage V4 and second voltage VSS, 160 basis of the second partial pressure unit
4th voltage V4 generates the second partial pressure V6.In some embodiments, second voltage VSS can be ground voltage GND, and the second partial pressure is single
Member 160 directly can convert out the second partial pressure V6 according to the 4th voltage V4, but the present invention is not limited thereto.In other embodiments
In, second voltage VSS is not ground voltage, and the second partial pressure unit 160 then can be according between the 4th voltage V4 and second voltage VSS
Voltage difference obtain the second partial pressure V6.
Second partial pressure unit 160 includes 3rd resistor 161 and the 4th resistance 162.The first end coupling the of 3rd resistor 161
Four voltage V4, and the second end of 3rd resistor 161 couples the first end of the 4th resistance 162, and the second end coupling of the 4th resistance 162
Second voltage VSS is met, and the second partial pressure V6 is between the second end of first resistor 161 and the first end of second resistance 162
Voltage.
An embodiment according to the present invention presets the resistance value ratio k1 between first resistor 111 and second resistance 112 and
Resistance value ratio k2 between three resistance 161 and the 4th resistance 162 makes 1/ (k1+1) of the first branch pressure voltage V2 first voltage V1, the
1/ (k2+1) that two partial pressure V6 are the 4th voltage V4, wherein resistance value ratio k1 is arranged to benefit resistance value ratio k2.According to the present invention one
Embodiment, the resistance error of each resistance can control between ± 1% to ± 2%, and be unlikely to influence resistance value ratio k1 and resistance
It is worth the setting than k2.
Local power supply unit 170 is the power module of second electronic device, including voltage source 171 and electric capacity of voltage regulation C6,
Wherein, the second connection end of one end coupling switch 140 of voltage source 171, the other end of voltage source 171 couple second voltage VSS,
The second connection end of one end coupling switch 140 of electric capacity of voltage regulation C6, the other end of electric capacity of voltage regulation C6 couple second voltage VSS.Electricity
Potential source 171 provides supply voltage VDD and is possible to power off, and electric capacity of voltage regulation C6 is for making power supply when voltage source 171 does not power off
Voltage VDD keeps stablizing.An embodiment according to the present invention, when the power supply of local power supply unit 170 and the first electricity of data pins 210
The difference V1-V4 between V1 and the 4th voltage V4 is pressed to be less than the threshold voltage of switch 140, the 4th voltage V4 is equivalent to supply voltage
The sum of VDD and second voltage VSS.When local power supply unit 170 powers off and difference between first voltage V1 and the 4th voltage V4 is big
In the threshold voltage of switch 140, the 4th voltage V4 is equal to the difference of the threshold voltage of first voltage V1 and switch 140.
Operating voltage generates unit 150 and couples the 4th voltage V4, second voltage VSS and detection unit 120.Operating voltage
It generates unit 150 and operating voltage V5 is generated according to the 4th voltage V4 and second voltage VSS, and output services voltage V5 is to detection
Unit 120, to drive the running of detection unit 120.In other words, operating voltage V5 is the driving voltage of detection unit 120.In
In some embodiments, operating voltage generates N/mono- that the operating voltage V5 that unit 150 generates is the 4th voltage V4, and N is positive whole
Number.For example, operating voltage V5 can be the half of the 4th voltage V4.
Detection unit 120 couples the first partial pressure unit 110, the second partial pressure unit 160 and operating voltage and generates unit
150, to receive the first partial pressure V2, second divides V6 and operating voltage V5, driving of the detection unit 120 in operating voltage V5
Under, compare the partial pressure V6 of the first partial pressure V2 and second, to judge whether the first partial pressure V2 is greater than the second partial pressure V6.In some embodiments
In, detection unit 120 has first input end and the second input terminal, and detection unit 120 is with its first input end reception the
One partial pressure V2, and the second partial pressure V6 is received with its second input terminal.Detection unit 120 is by comparing the first V2 and second point of partial pressure
The size of pressure V6 determines the output of detection unit 120.Specifically, V6 is divided when the first partial pressure V2 is greater than second, that is, V1 is greater than
V4* (k1+1)/(k2+1), the logic high of 120 output services voltage V5 size of detection unit, that is, signal S1, when first
V2 is divided less than the second partial pressure V6, that is, V1 is less than V4* (k1+1)/(k2+1), detection unit 120 exports the logic low electricity of 0V
It is flat, that is, signal S2.Due to detection unit 120 be using operating voltage V5 as driving voltage, and operating voltage V5 be the 4th voltage
N/mono- of V4, thus the running of detection unit 120 always can be with living the variation of the 4th voltage V4.Compared to other electricity
Source voltage drives detection unit 120, and the detection unit 120 driven using operating voltage V5 responds speed to the variation of the 4th voltage V4
Degree is faster.In some embodiments, as illustrated in fig. 1, detection unit 120 can utilize comparator or other suitable logic circuits
It realizes, at this time the non-inverting input terminal of the first input end, that is, comparator, second input terminal, that is, comparator reverse phase are defeated
Enter end.
Vent unit 130 includes switch module 131 and pressure limiting module 132.The first end of switch module 131 is coupled to
Two voltage VSS, the first end of the second end coupling pressure limiting module 132 of switch module 131, the third end coupling of switch module 131
The output end of pressure limiting module couples detection unit 120 is to receive above-mentioned signal S1 or signal S2, the second end coupling of pressure limiting module 132
Meet first voltage V1.Conducting when its third end receives the signal S1 from detection unit 120 of switch module 131, and cause to count
It can sequentially release via pressure limiting module 132 and switch module 131 to ground terminal GND according to the first voltage V1 on pin 210.Its
In, from data pins 210 by being described let out by pressure limiting module 132 and switch module 131 to the path of second voltage VSS
Put path.In this, pressure limiting module 132 can divide first voltage V1 when switch module 131 is connected, so that first voltage
V1 is pulled to V4* (k1+1)/(k2+1) when releasing to ground terminal GND.Switch module 131 is received in its third end carrys out self-test
It is turned off when the signal S2 of unit 120, and the first voltage V1 in data pins 210 is made to remain stationary.In some embodiments, it limits
Die block 132 includes the multiple diodes sequentially concatenated, these diodes are also turned on when switch module 131 is connected, switched
Module 131 is also ended when ending.In some embodiments, the voltage endurance capability phase of the quantity of these diodes and switch module 131
It closes.In some embodiments, as illustrated in fig. 1, switch module 131 can be the N-type controlled by signal S1 or signal S2
Transistor, the first end of source electrode, that is, switch module 131 of this N-type transistor, grid, that is, switch module 131 of N-type transistor
Third end, the drain electrode of N-type transistor are the second end of switch module 131.In further embodiments, switch module 131 can also
To be one by the signal S1/S2 logic switch controlled or multiple selector.
In some embodiments, voltage-regulating circuit 100 can include also multiple electric capacity of voltage regulation, to promote the stabilization of circuit
Property.For example, one end of the first electric capacity of voltage regulation C1 can be coupled to the junction between switch module 131 and pressure limiting module 132,
And first the other end of electric capacity of voltage regulation C1 be coupled to second voltage VSS.One end of second electric capacity of voltage regulation C2 can be coupled to pressure limiting mould
Junction between block 132 and data pins 210, and the other end of the second electric capacity of voltage regulation C2 is coupled to the same of detection unit 120
Phase input terminal.One end of third electric capacity of voltage regulation C3 may be coupled to the non-inverting input terminal of detection unit 120, and third electric capacity of voltage regulation C3
The other end be coupled to second voltage VSS.One end of 4th electric capacity of voltage regulation C4 may be coupled to pressure limiting module 132 and data pins
Junction between 210, and the other end of the 4th electric capacity of voltage regulation C4 is coupled to second voltage VSS.The one of 5th electric capacity of voltage regulation C5
End may be coupled to the inverting input terminal of detection unit 120, and the other end of the 5th electric capacity of voltage regulation C5 is coupled to second voltage VSS.
Fig. 2A and Fig. 2 B is the schematic diagram that operating voltage generates unit 150 in Fig. 1.Fig. 2A and Fig. 2 B are please referred to, it is real one
It applies in example, it includes input module 151, input biasing module 152, bias current module 153, that operating voltage, which generates unit 150,
One bias voltage module 154, the second bias voltage module 155 and output module 156.
Input biasing module 152 is coupled between the 4th voltage V4 and second voltage VSS, the fixed resistance string including concatenation
1521 and can resistance trimming string 1522.Biasing module 152 is inputted according to the voltage difference between the 4th voltage V4 and second voltage VSS,
Input bias V7 is generated in fixed resistance string 1521.In some embodiments, input bias V7 generally can be the M of the 4th voltage V4
/ mono-, M are positive integer.For example, input bias V7 can the substantially half of the 4th voltage V4.Input biasing module
152 also in fixed resistance string 1521 and can generate the biasing generated inside unit 150 for operating voltage between resistance trimming string 1522
Voltage V8.
Input module 151 is coupled between the 4th voltage V4 and second voltage VSS.Input module 151 has a positive input
End and a negative input end.Wherein, the positive input terminal of input module 151 receives input bias V7, and the negative input of input module 151
End receives the operating voltage V5 that output module 156 exports, and forms negative-feedback.
An embodiment according to the present invention, input module 151 include input to 1511 and tail current source 1512.Tail current source
1512 be coupled to the 4th voltage V4 and input between 1511 to provide input current to 1511 to input.In general, input
It may include two P-type transistors P1, P2 to 1511.The source electrode of P-type transistor P1 and the source electrode of P-type transistor P2 are commonly connected to
Tail current source 1512, to receive the input current of the offer of tail current source 1512.The grid of P-type transistor P1 receives operating voltage
V5, and the grid of P-type transistor P2 receives input bias V7, respectively in operating voltage V5 and under inputting the control of bias V7
Generate the output voltage to the second bias voltage module 155.An embodiment according to the present invention, input can also include two to 1511
P-type transistor P3, P4.Wherein, the source electrode of P-type transistor P3 is coupled to the drain electrode of P-type transistor P1, and P-type transistor P4
Source electrode is coupled to the drain electrode of P-type transistor P2.The grid of P-type transistor P3 and the grid of P-type transistor P4 receive bias voltage
V8.In this, P-type transistor P1, P2 and P-type transistor P3, P3 constitute cascode structure, to prevent P-type transistor P1, P2
Drain-source voltage Vds is excessive and P-type transistor P1, P2 aging is caused even to be burnt.
Bias current module 153 is coupled between the 4th voltage V4 and second voltage VSS, to generate bias current I1.In
This, bias current I1 is the reference current in operating voltage generation unit 150.
Please refer to Fig. 2A and Fig. 2 B, the first bias voltage module 154 be coupled to the 4th voltage V4 and second voltage VSS it
Between, to generate first group of bias voltage according to bias current I1.In this, first group of bias voltage includes bias voltage VR1, biasing
Voltage VR2, bias voltage VR3, bias voltage VR4, bias voltage VB1 and bias voltage VB2.In addition, the first bias voltage
Module 154 also can be used to generate bias voltage VB3.
Second bias voltage module 155 is coupled between the 4th voltage V4 and second voltage VSS, and to according to biased electrical
I1 and first group of bias voltage of stream generates second group of bias voltage.Also, output module 156 can be produced according to second group of bias voltage
Raw operating voltage V5.In this, second group of bias voltage includes bias voltage VO1 and bias voltage VO2, and second group of bias voltage
Zone of reasonableness can be biased in guarantee the low static power of output module 156.
In some embodiments, operating voltage, which generates unit 150, can also finely tune it according to multiple trim voltage VT1-VT4
The operating voltage V5 of output.It in this, is illustrated by taking four trim voltage VT1-VT4 as an example, but its quantity is not limited only to
This.
Input biasing module 152 in can resistance trimming string 1522 can change its resistance value according to trim voltage VT1-VT4, with by
The operating voltage V5 of output is finely tuned by fine tuning input bias V7.
Refering to fig. 1 with Fig. 2A, in some embodiments, voltage-regulating circuit 100 can also include potential shift unit 180.
Current potential of the potential shift unit 180 to shift these trim voltages VT1-VT4, so that the trim voltage VTH1- after displacement
VTH4 be applicable to operating voltage generate unit 150, can resistance trimming string 1522 then according to the trim voltage VTH1-VTH4 after displacement come
Change can resistance trimming string 1522 resistance value.For example, when the voltage of trim voltage VT1 is 1V, via potential shift unit 180
The voltage of trim voltage VTH1 after displacement can be 1.8V.And when the current potential of trim voltage VT1 is 0V, via potential shift list
The current potential of trim voltage VTH1 after 180 displacement of member is also 0V.The displacement of remaining trim voltage VT2-VT4 is substantially the same in micro-
Voltage VT1 is adjusted, so it will not be repeated.
In some embodiments, voltage-regulating circuit 100 can utilize the process technique of smaller size, such as 16 nanometers (nm)
And process technique below is made.
In conclusion the embodiment of the present invention provides a kind of voltage-regulating circuit suitable for port, it is single using detection
Whether the data voltage in data pins of the member to judge port is excessively high, and can be connected and release when judging that data voltage is excessively high
Unit is low to cause data voltage that can be dragged by the path of releasing of vent unit.In addition, the voltage of the embodiment of the present invention
Adjustment circuit also generates unit using operating voltage to generate operating voltage to detection unit as its driving power, so that detection
The response speed of unit can faster, as long as and with the presence of end voltage, detection unit can actuation.Furthermore implementation of the invention
The voltage-regulating circuit of example can be made using the process technique of smaller size, and area occupied is smaller and still can be applied to larger voltage
Application under.
The embodiment of the present invention discloses as above, the range that however, it is not to limit the invention, any technical field
Middle tool usually intellectual, in the spirit and scope for not departing from the embodiment of the present invention, when can do a little change and retouching, because
This protection scope of the present invention is subject to view appended claims protection scope institute defender.
Claims (12)
1. a kind of voltage-regulating circuit is suitable for communication port, which includes:
First partial pressure unit couples the data pins and second voltage of the communication port, according to the first of the data pins
Voltage and the second voltage generate the first partial pressure；
Switch, the first end of the switch are coupled to the data pins, and the second end of the switch couples tertiary voltage, and the switch in
When the first voltage is more than one threshold voltage of tertiary voltage, the connection path between the first end and the second end is established；
Second partial pressure unit couples the tertiary voltage and the second voltage, according to the tertiary voltage and the second voltage
Generate the second partial pressure；
Detection unit couples first partial pressure unit and second partial pressure unit, with receive this first partial pressure and this second
Partial pressure, and judge whether first partial pressure is greater than second partial pressure, first is generated when first partial pressure is greater than second partial pressure
Signal generates second signal when first partial pressure is less than second partial pressure；And
Vent unit couples the detection unit, the data pins and the second voltage, conducting when receiving first signal
The data pins and second electricity are truncated in connection between the data pins and the second voltage when receiving the second signal
Connection between pressure.
2. voltage-regulating circuit as described in claim 1, which includes:
Switch module, the first end of the switch module couple the detection unit to receive first signal or the second signal, are somebody's turn to do
The second end of switch module couples the second voltage, which is connected and the second voltage when receiving first signal
The connection with the second voltage is truncated in connection when receiving the second signal；And
Pressure limiting module is coupled between the third end of the switch and the data pins, and in the switch module conducting with this second
The first voltage is dragged down when the connection of voltage.
3. voltage-regulating circuit as claimed in claim 2, which includes multiple diodes of sequential concatenation, wherein institute
Diode is stated to be connected when the switch module is connected with the connection of the second voltage.
4. voltage-regulating circuit as described in claim 1, first partial pressure unit include:
First resistor and second resistance, the first end of the first resistor are coupled to the data pins, and the second of the first resistor
End is coupled to the first end of the second resistance, and the second end of the second resistance is coupled to the second voltage, wherein first partial pressure
It is to be generated in the second end of the first resistor of coupling and the first end of the second resistance.
5. voltage-regulating circuit as claimed in claim 4, wherein the resistance value ratio of the first resistor and the second resistance is first
Resistance value ratio.
6. voltage-regulating circuit as described in claim 1, second partial pressure unit include:
3rd resistor and the 4th resistance, the first end of the 3rd resistor couple the tertiary voltage, the second end of the 3rd resistor
The first end of the 4th resistance is coupled, the second end of the 4th resistance couples the second voltage, wherein second partial pressure is in coupling
The second end of the 3rd resistor connect and the first end of the 4th resistance generate.
7. voltage-regulating circuit as claimed in claim 6, wherein the resistance value ratio of the 3rd resistor and the 4th resistance is second
Resistance value ratio.
8. voltage-regulating circuit as described in claim 1, wherein when the detection unit exports first signal, the first voltage
Size be adjusted to V3* (k1+1)/(k2+1), k1 < k2, wherein V3 is the tertiary voltage, and k1 is first partial pressure unit tool
The first standby resistance value ratio, k2 are the second resistance value ratios that second partial pressure unit has.
9. voltage-regulating circuit as described in claim 1 further includes that operating voltage generates unit, which generates unit
Operating voltage is generated according to the tertiary voltage and the second voltage and is exported to the detection unit, and the detection unit is in the work
Judgement operation is executed under voltage.
10. voltage-regulating circuit as claimed in claim 9, wherein the operating voltage generates unit and includes:
Input module is coupled between the tertiary voltage and the second voltage, and the first input end of the input module receives input
Bias, and the second input terminal of the input module receives the operating voltage；
Biasing module is inputted, is coupled between the tertiary voltage and the second voltage, and to generate the input bias；
Bias current module is coupled between the tertiary voltage and the second voltage, and to generate bias current；
First bias voltage module is coupled between the tertiary voltage and the second voltage, and to be miscarried according to the biased electrical
Raw first group of bias voltage；
Second bias voltage module is coupled between the tertiary voltage and the second voltage, and to according to the bias current with
First group of bias voltage generates second group of bias voltage；And
Output module is coupled between the tertiary voltage and the second voltage, and the output module is according to second group of bias voltage
Generate the operating voltage.
11. voltage-regulating circuit as claimed in claim 10, wherein the input biasing module include the fixed resistance string of concatenation with
And can resistance trimming string, wherein this can resistance trimming string according to multiple trim voltages change this can resistance trimming string resistance value, it is inclined to finely tune the input
Pressure.
12. voltage-regulating circuit as claimed in claim 11 includes also potential shift unit, the potential shift unit is to move
The current potential of the position trim voltage, and this can resistance trimming string its resistance value changed according to the trim voltage after displacement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910922597.8A CN110531821B (en) | 2019-09-27 | 2019-09-27 | Voltage regulation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910922597.8A CN110531821B (en) | 2019-09-27 | 2019-09-27 | Voltage regulation circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110531821A true CN110531821A (en) | 2019-12-03 |
| CN110531821B CN110531821B (en) | 2021-02-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910922597.8A Active CN110531821B (en) | 2019-09-27 | 2019-09-27 | Voltage regulation circuit |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201393057Y (en) * | 2009-03-04 | 2010-01-27 | 鸿富锦精密工业（深圳）有限公司 | Over-voltage and under-voltage protection circuit |
| CN206226055U (en) * | 2016-10-19 | 2017-06-06 | 深圳市沃特沃德股份有限公司 | A kind of electronic equipment, interface module and its charging overvoltage protection circuit |
| JP2017224769A (en) * | 2016-06-16 | 2017-12-21 | 富士電機株式会社 | Semiconductor integrated circuit device |
| CN110176750A (en) * | 2019-05-24 | 2019-08-27 | 深圳市道通智能航空技术有限公司 | Overvoltage crowbar |
-
2019
- 2019-09-27 CN CN201910922597.8A patent/CN110531821B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201393057Y (en) * | 2009-03-04 | 2010-01-27 | 鸿富锦精密工业（深圳）有限公司 | Over-voltage and under-voltage protection circuit |
| JP2017224769A (en) * | 2016-06-16 | 2017-12-21 | 富士電機株式会社 | Semiconductor integrated circuit device |
| CN206226055U (en) * | 2016-10-19 | 2017-06-06 | 深圳市沃特沃德股份有限公司 | A kind of electronic equipment, interface module and its charging overvoltage protection circuit |
| CN110176750A (en) * | 2019-05-24 | 2019-08-27 | 深圳市道通智能航空技术有限公司 | Overvoltage crowbar |
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| Publication number | Publication date |
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| CN110531821B (en) | 2021-02-26 |
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