CN108768353A - driving circuit - Google Patents

driving circuit Download PDF

Info

Publication number
CN108768353A
CN108768353A CN201810549420.3A CN201810549420A CN108768353A CN 108768353 A CN108768353 A CN 108768353A CN 201810549420 A CN201810549420 A CN 201810549420A CN 108768353 A CN108768353 A CN 108768353A
Authority
CN
China
Prior art keywords
voltage
resistance
unit
demand
driving circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201810549420.3A
Other languages
Chinese (zh)
Other versions
CN108768353B (en
Inventor
陈启仁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qisda Optronics Suzhou Co Ltd
Qisda Corp
Original Assignee
Qisda Optronics Suzhou Co Ltd
Qisda Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qisda Optronics Suzhou Co Ltd, Qisda Corp filed Critical Qisda Optronics Suzhou Co Ltd
Priority to CN201810549420.3A priority Critical patent/CN108768353B/en
Publication of CN108768353A publication Critical patent/CN108768353A/en
Application granted granted Critical
Publication of CN108768353B publication Critical patent/CN108768353B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K7/00—Modulating pulses with a continuously-variable modulating signal
    • H03K7/08—Duration or width modulation ; Duty cycle modulation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/01—Details
    • H03K3/017—Adjustment of width or dutycycle of pulses

Landscapes

  • Semiconductor Integrated Circuits (AREA)

Abstract

The present invention discloses a kind of driving circuit, and for driving the first integrated chip, the first integrated chip that there is input port and enable port, the first integrated chip to have the first enabled voltage, driving circuit includes voltage providing unit and protection location.Voltage providing unit couples input port, and voltage providing unit is for providing the first input voltage；Protection location couples the output end of voltage providing unit, and there is protection location the first control node, the first control node to couple enable port；When the demand voltage of the first integrated chip is the first demand voltage, then driving circuit corresponds to the first demand voltage and determines the first operating mode and the first threshold voltage, when the first input voltage reaches the first threshold voltage, first node voltage reaches the first enabled voltage, the work of the first integrated chip.The present invention can avoid because the first input voltage instantaneous variation causes the risk of the damage to the first integrated chip itself and its with electric device.

Description

Driving circuit
Technical field
The present invention relates to a kind of driving circuit more particularly to a kind of drives with protection integrated chip and electricity consumption element function Dynamic circuit.
Background technology
Pulse Width Modulation chip (PWM IC) generally has enable port (Enable pin), for enable port, it will usually One fixed voltage level of setting to interlock with input voltage vin, which can be described as enabled voltage.When input electricity When pressure Vin reaches certain level, the voltage at enable port (Enable pin) reaches above-mentioned enabled voltage, to enable this Pulse Width Modulation chip, Pulse Width Modulation chip are started to work, be connected to Pulse Width Modulation chip with electric device (such as metal-oxide Object semiconductor field effect transistor MOSFET) it starts to work.
Referring to FIG. 1, Fig. 1 is the schematic diagram of driving circuit in the prior art.In driving circuit 100 ', work as input voltage When Vin ' reaches 6.8V, the voltage at the enable port EN ' of Pulse Width Modulation chip IC 1 ' reaches 1.26V, this voltage reaches pulsewidth The enabled voltage of modulation chip IC 1 ', to which Pulse Width Modulation chip IC 1 ' is started to work.In practical operation, work as input voltage vin ' Higher (be, for example, 20V), while when enabled voltage relatively low (being, for example, 1.26V), can be in input voltage vin ' moment changes When and flow through to be coupled to the electric current with electric device Q1 ' (such as MOSFET) of Pulse Width Modulation chip IC 1 ' and suddenly become larger.When When certain connector contacts are bad in power supply circuit or instantaneous power failure, input voltage vin ' it is likely to occur and drops to 7V from 20V and return again It is raised to the instantaneous variation of 20V, due to working as input voltage vin ' it still is able to so that the voltage at the EN ' of enable port reaches makes when being 7V Can voltage, so when pulse modulation chip IC 1 ' work on, and in order to maintain to work normally, Pulse Width Modulation chip IC 1 ' Duty ratio become larger, for example, 90% or more, the duty ratio with electric device Q1 ' being connect at this time with Pulse Width Modulation chip IC 1 ' with Pulse Width Modulation chip IC 1 ' is consistent.Work as input voltage vin ' it is returned to 20V from 7V moments, Pulse Width Modulation chip IC 1 ' needs There are some reaction time that duty ratio could become smaller, but prodigious immediate current can be born with electric device Q1 ' during this, there are arteries and veins It reconstitutes and becomes chip IC 1 ' itself and with risk impaired electric device Q1 '.
Invention content
It is an object of the invention to provide a kind of driving circuits, are provided with protection location, to protect the integrated chip in circuit And its with electric device, integrated chip is avoided and with electric device because the instantaneous large-current being likely to occur leads to asking for impaired even damage Topic.
In order to achieve the above object, the present invention proposes a kind of driving circuit, for driving the first integrated chip, first collection At chip there is input port and enable port, first integrated chip to have the first enabled voltage, which includes：
Voltage providing unit couples the input port, and the voltage providing unit is for providing the first input voltage；And
Protection location couples the output end of the voltage providing unit, which has the first control node, this first Control node couples the enable port, and it is first node voltage to define the voltage at first control node；
Wherein, when the demand voltage of first integrated chip is the first demand voltage, then the driving circuit correspond to this One demand voltage and determine the first operating mode, and further determine that first integrated chip threshold input voltage be first Sill voltage, when first input voltage reaches first threshold voltage, which reaches the first enabled voltage, First integrated chip works；
When the demand voltage of first integrated chip is the second demand voltage, which is less than first need Voltage is sought, then the driving circuit corresponds to second demand voltage and determines the second operating mode, and further determines that first collection The threshold input voltage at chip is the second threshold voltage, which is less than first threshold voltage, when this When one input voltage reaches second threshold voltage, which reaches the first enabled voltage, the first integrated core Piece works.
As optional technical solution, when the driving circuit is in first operating mode, if first input voltage Less than first threshold voltage, then the first node voltage is less than the first enabled voltage, which does not work；When When the driving circuit is in second operating mode, if first input voltage is less than second threshold voltage, the first segment Point voltage is less than the first enabled voltage, which does not work.
As optional technical solution, which includes：
There is first partial pressure unit opposite first end and second end, the first end to couple the defeated of the voltage providing unit Outlet, the second end couple first control node, and the voltage for defining the first partial pressure unit both ends is the first partial pressure；And
Second partial pressure unit is connected with first partial pressure unit, which has opposite third end and the Four ends, the third end couple the second end, and the voltage of the 4th end ground connection, the second partial pressure unit both ends is the second partial pressure, should First partial pressure and second partial pressure and be equal to first input voltage, which is equal to second partial pressure, this When the demand voltage difference of one integrated chip, second partial pressure is different from the ratio of first input voltage.
As optional technical solution, effective resistance value of first partial pressure unit is first unit resistance value, is denoted as R1, this Effective resistance value of two partial pressure units is second unit resistance value, is denoted as R2, which is denoted as V1, this second is divided It is denoted as VF2, then is met：VF2/V1=R2/ (R1+R2), when the demand voltage difference of first integrated chip, the second unit Resistance value is different.
As optional technical solution, which includes the first quantity resistance, and the first number amount≤1st should Second partial pressure unit includes the second quantity resistance, the 2nd number amount≤2.
As optional technical solution, which includes 1 resistance, is defined as first resistor, first electricity The resistance value of resistance is the first resistance value, which is equal to first resistance value, which includes concatenated 2 electricity Resistance is respectively defined as second resistance and 3rd resistor, and the resistance value of the second resistance is the second resistance value, and the resistance value of the 3rd resistor is Third resistance value, wherein when the driving circuit is in first operating mode, which is equal to second resistance value； When the driving circuit is in second operating mode, which is equal to second resistance value and the third resistance value With.
As optional technical solution, it also includes control which, which also has the second control node, the driving circuit, Unit, the control unit have the first output end, and first output end is for exporting the first level signal, the first output end coupling Second control node is connect, one end of the second resistance is the third end, and the other end of the second resistance couples second control One end of node, the 3rd resistor couples second control node, and the other end of the 3rd resistor is the 4th end, wherein when When the driving circuit is in first operating mode, which is low level signal, which is wrapped The effective resistance contained is the second resistance, and the second unit resistance value is made to be equal to second resistance value；When the driving circuit be in this When two operating modes, which is high level signal, the effective resistance which is included be this Two resistance and the 3rd resistor, make the second unit resistance value be equal to second resistance value and the third resistance value and.
As optional technical solution, which also there is the first control terminal, first control terminal to couple the voltage Unit is provided, in use, the control unit is first carried according to the demand voltage of first integrated chip by first output end For the first level signal to the protection location, to determine the operating mode of the driving circuit and the threshold of first integrated chip Input voltage, then the control unit according to the demand voltage pass through first control terminal provide voltage signal to the voltage provide Unit, the voltage providing unit export matched first input voltage according to the voltage signal.
As optional technical solution, which also has the second control terminal, second control terminal couple this first Enable port of integrated chip, in use, the control unit first passes through this according to the demand voltage of first integrated chip First output end provides the first level signal to the protection location, to determine the operating mode of the driving circuit and this is first integrated The threshold input voltage of chip, then first control terminal export high level signal.
As optional technical solution, which includes 1 resistance, is defined as first resistor, first electricity The resistance value of resistance is the first unit resistance value, which includes 5 resistance of series connection, is respectively defined as second resistance, the Three resistance, the 4th resistance, the 5th resistance and the 6th resistance, the protection location also have the second control node, third control node, One end of 4th control node and the 5th control node, the second resistance is the third end, and the other end of the second resistance couples Second control node, one end of the 3rd resistor couple second control node, the other end of the 3rd resistor couple this One end of three control nodes, the 4th resistance couples the third control node, and the other end of the 4th resistance couples the 4th control One end of node processed, the 5th resistance couples the 4th control node, and the other end of the 5th resistance couples the 5th control section One end of point, the 6th resistance couples the 5th control node, the other end ground connection of the 6th resistance, which also includes Control unit, the control unit have the first control terminal, the first output end, second output terminal, third output end and the 4th output End, first control terminal couple the voltage providing unit, which couples second control node, the second output terminal The third control node is coupled, which couples the 4th control node, and the 4th output end couples the 5th control Node, wherein
When the demand voltage of first integrated chip be first demand voltage when, then the driving circuit correspond to this first Demand voltage sends out the first level signal by the control unit, exports low level signal to control first output end, this Two output ends, the third output end and the 4th output end export high level signal, so that it is determined that going out the work of the driving circuit Pattern is first operating mode, and further determines that the threshold input voltage is first threshold voltage, at this time second list First resistance value is equal to the resistance value of the second resistance, and then the control unit controls voltage providing unit output and matches first threshold First input voltage of voltage；
When the demand voltage of first integrated chip be second demand voltage when, then the driving circuit correspond to this second Demand voltage sends out second electrical level signal by the control unit, with control first output end, the third output end and this Four output ends export high level signal, which exports low level signal, so that it is determined that going out the work of the driving circuit Pattern is second operating mode, and further determines that the threshold input voltage is second threshold voltage, at this time second list First resistance value is equal to the sum of the resistance value of the second resistance and the 3rd resistor, and then it is defeated to control the voltage providing unit for the control unit Go out to match first input voltage of second threshold voltage；
When the demand voltage of first integrated chip is third demand voltage, which is less than second need Voltage is sought, then the driving circuit corresponds to the third demand voltage and sends out third level signal by the control unit, should with control First output end, the second output terminal and the 4th output end export high level signal, which exports low level letter Number, so that it is determined that the operating mode for going out the driving circuit is third operating mode, and further determine that the threshold input voltage is Third threshold voltage, the third threshold voltage are less than second threshold voltage, and the second unit resistance value is equal to second electricity at this time It hinders, the sum of the resistance value of the 3rd resistor and the 4th resistance, then the control unit controls voltage providing unit output matching First input voltage of the third threshold voltage；
When the demand voltage of first integrated chip is the 4th demand voltage, the 4th demand voltage is needed less than the third Voltage is sought, then the driving circuit corresponds to the 4th demand voltage and sends out the 4th level signal by the control unit, should with control First output end, the second output terminal and the third output end export high level signal, and the 4th output end exports low level letter Number, so that it is determined that the operating mode for going out the driving circuit is the 4th operating mode, and further determine that the threshold input voltage is 4th threshold voltage, the 4th threshold voltage are less than the third threshold voltage, and the second unit resistance value is equal to second electricity at this time It hinders, the sum of the resistance value of the 3rd resistor, the 4th resistance and the 5th resistance, then the control unit controls the voltage and provides list First input voltage of member output the 4th threshold voltage of matching；
When the demand voltage of first integrated chip is the 5th demand voltage, the 5th demand voltage, which is less than the 5th, to be needed Voltage is sought, then the driving circuit corresponds to the 5th demand voltage and sends out the 5th level signal by the control unit, should with control First output end, the second output terminal, the third output end and the 4th output end export high level signal, so that it is determined that going out this The operating mode of driving circuit is the 5th operating mode, and further determines that the threshold input voltage is the 5th threshold voltage, should 5th threshold voltage is less than the 4th threshold voltage, and the second unit resistance value has equal to the second resistance, third electricity at this time It hinders, the sum of the resistance value of the 4th resistance and the 5th resistance, then the control unit controls voltage providing unit output matching First input voltage of 5th threshold voltage.
The driving circuit of the present invention determines a variety of different operatings according to the different demand voltages of the first integrated chip Pattern, and further determine that the different threshold input voltage of the first integrated chip.Threshold input voltage with demand voltage change Become larger greatly.Under each operating mode, only when the first input voltage has reached threshold input voltage at this time, it can make The voltage of the first control node that is coupled with the enable port of the first integrated chip reach the first enabled voltage, could make the One integrated chip works, and avoids because the first input voltage moment voltage quasi position for becoming hour enable port still is able to reach the One enabled voltage, to which the first integrated chip continues to work and improves duty ratio to work normally, in the first input electricity Pressure moment replys when originally inputting voltage and generates instantaneous large-current, causes to the first integrated chip itself and its with the damage of electric device The risk of wound.
Below in conjunction with the drawings and specific embodiments, the present invention will be described in detail, but not as a limitation of the invention.
Description of the drawings
Fig. 1 is the schematic diagram of the driving circuit of the prior art；
Fig. 2 is the block diagram of an embodiment of the driving circuit of the present invention；
Fig. 3 is the block diagram of another embodiment of the driving circuit of the present invention；
Fig. 4 is the schematic diagram of protection location in Fig. 3.
Specific implementation mode
The explanation of following embodiment is to refer to additional schema, to illustrate the particular implementation that the present invention can be used to implement Example.The direction term that the present invention is previously mentioned, such as "upper", "lower", "front", "rear", "left", "right", " side " etc. are only references The direction of annexed drawings.Therefore, the direction term used is to illustrate and understand the present invention, rather than to limit the present invention.
In the examples below, in various figures, same section is to be given the same reference numerals.
Referring to FIG. 2, Fig. 2 is the block diagram of an embodiment of the driving circuit of the present invention.The driving electricity of the present invention Road 1000, for driving the first integrated chip 2000, the first integrated chip 2000 to can be connected to few one with electric device 3000.The There is one integrated chip 2000 input port VIN and enable port EN, the first integrated chip 2000 to have the first enabled voltage VE1, when the voltage quasi position of enable port EN reaches the first enabled voltage VE1, the work of the first integrated chip 2000.Practical operation In, the first enabled voltage VE1 can be with the relevant voltage quasi position of 2000 self-characteristic of the first integrated chip, in general, one collection Enabled voltage at chip can be fixed value.In the present embodiment, the first enabled voltage VE1 of the first integrated chip 2000 is 1.21V。
As shown in Fig. 2, driving circuit 1000 includes voltage providing unit 100 and protection location 200.Voltage providing unit The input port VIN of 100 the first integrated chips 2000 of coupling, voltage providing unit 100 is for providing the first input voltage.Protection Unit 200 couples the output end of voltage providing unit 100, and protection location 200 has the first control node Q1, defines the first control Voltage at node Q1 is first node voltage VQ1, and the first control node Q1 couples the enable port of the first integrated chip 2000 EN。
The driving circuit 1000 of the present invention can be applied in machine system.In practical operation, the first integrated chip 2000 There is different demand voltages according to the different function situations of machine system, then driving circuit 1000, which corresponds to, has different works Operation mode.In the present embodiment, voltage providing unit 100 can be adapter, and further, voltage providing unit 100 can be type- C adapter, the output voltage (i.e. aforementioned first input voltage) of adapter is for example including 5V, 9V, 12V, 15V and 20V, adapter Specific output voltage can switch over adjustment according to the instruction for power control chip of machine system.As shown in Fig. 2, driving Dynamic circuit 1000 can include also control unit 300, and in practical operation, control unit 300 is, for example, above-mentioned for power control core Piece, control unit 300 couple voltage providing unit 100 to control the output voltage of voltage providing unit 100.Specifically, control Unit 300 can have the first control terminal c1, the first control terminal c1 to couple voltage providing unit 100.In use, control unit 300 Voltage instruction to voltage can be sent by the first control terminal c1 and provided according to the current demand voltage of the first integrated chip 2000 Unit 100, voltage providing unit 100 export the first input voltage of matching current demand to first integrated according to the voltage instruction The input port VIN of chip 2000.
When so that the demand voltage of the first integrated chip 2000 is the first demand voltage according to current function situation, Then driving circuit 1000 corresponds to first demand voltage and determines the first operating mode, and further determines that the first integrated chip 2000 threshold input voltage is the first threshold voltage VD1, when the first input voltage reaches the first threshold voltage VD1, first Node voltage VQ1 reaches the first enabled voltage VE1, since the first control node Q1 couples enable port EN, so when Enable Pin The voltage quasi position of mouth EN has also reached the first enabled voltage VE1, to which the first integrated chip 2000 works；When the first input voltage When less than the first threshold voltage VD1, first node voltage VQ1 be less than the first enabled voltage VE1, therefore with the first control node Q1 couplings The voltage quasi position of the enable port EN connect voltage VE1 enabled again smaller than first, to which the first integrated chip 2000 does not work.
In the present invention, when the first integrated chip 2000 determines that demand voltage is the first demand according to current function situation When voltage, driving circuit 1000 determines the first operating mode, and further determines that the first threshold voltage VD1, at this time only when the One input voltage reaches the first threshold voltage VD1, and first node voltage VQ1 can be only achieved the first enabled voltage VE1, enable port EN can be enabled.First threshold voltage VD1 can be to be not directly relevant to 2000 self-characteristic of the first integrated chip, but with the The relevant voltage quasi position of the first demand voltage of one integrated chip 2000.In the present embodiment, the first demand voltage be 20V, first Threshold voltage VD1 is 16V.
It is illustrated by taking the scene in background technology as an example when the demand voltage of the first integrated chip 2000 is the first demand Situation when voltage.Driving circuit 1000 determines the first operating mode at this time, and further determines that the first integrated chip 2000 First threshold voltage VD1.In the present embodiment, the first demand voltage is 20V, and the first threshold voltage VD1 is 16V, the first enabled electricity Pressure VE1 is 1.21V.At the beginning, the first input voltage that voltage providing unit 100 is exported according to current demand voltage is 20V, The first threshold voltage VD1 is reached, then first node voltage VQ1 has reached the first enabled voltage VE1, and enable port EN can make Can, the work of the first integrated chip 2000.If the subelement (such as connector) at this time in voltage providing unit 100 contacts Instantaneous variation occurs for the first input voltage that is bad or instantaneous power failure occurring etc. and voltage providing unit 100 is exported, Such as moment drops to 7V from 20V and returns 20V, when the first input voltage drops to 7V, be less than the first threshold voltage VD1, then this When first node voltage VQ1 be less than the first enabled voltage VE1, to enable port EN voltage quasi position again smaller than the first enabled electricity VE1, the first integrated chip 2000 is pressed not to work；When the first input voltage is returned to 20V again from 7V, the first input at this time Voltage has reached the first threshold voltage VD1, and enable port EN is enabled, and the first integrated chip 2000 is reworked.
When so that the demand voltage of the first integrated chip 2000 is the second demand voltage according to current function situation, Second demand voltage is less than the first demand voltage, then driving circuit 1000 corresponds to second demand voltage and determines the second Working mould Formula, and further determine that the threshold input voltage of the first integrated chip 2000 is the second threshold voltage VD2, the second threshold voltage VD2 is less than the first threshold voltage VD1.When the first input voltage reaches the second threshold voltage VD2, first node voltage VQ1 reaches To the first enabled voltage VE1, since the first control node Q1 couples enable port EN, so when enable port EN voltage quasi position Also the first enabled voltage VE1 has been reached, to which the first integrated chip 2000 works；When the first input voltage is less than the second threshold electricity When pressing VD2, first node voltage VQ1 is less than the first enabled voltage VE1, therefore the enable port EN coupled with the first control node Q1 Voltage quasi position voltage VE1 enabled again smaller than first, the first integrated chip 2000 do not work.
In the present invention, when the first integrated chip 2000 determines that demand voltage is the second demand according to current function situation When voltage, driving circuit 1000 determines the second operating mode, and further determines that second open voltage VD2, at this time only when the One input voltage reaches the second threshold voltage VD2, and first node voltage VQ1 can be only achieved the first enabled voltage VE1, enable port EN can be enabled.Similar, the second threshold voltage VD2 can be to be not directly relevant to 2000 self-characteristic of the first integrated chip, But with the relevant voltage quasi position of the second demand voltage of the first integrated chip 2000.In the present embodiment, the second demand voltage example Such as it is 15V, the second threshold voltage VD2 is 11V.
It is equally illustrated by taking the scene in background technology as an example when the demand voltage of the first integrated chip 2000 is second Situation when demand voltage.Driving circuit 1000 determines the second operating mode at this time, and further determines that the first integrated chip 2000 the second threshold voltage VD2.In the present embodiment, the second demand voltage be 15V, the second threshold voltage VD2 be 11V, first Enabled voltage VE1 is still 1.21V.At the beginning, the first input electricity that voltage providing unit 100 is exported according to current demand voltage Pressure is 15V, has reached the second threshold voltage VD2, then first node voltage VQ1 has reached the first enabled voltage VE1, enable port EN can be enabled, the work of the first integrated chip 2000.If the subelement (such as connector) at this time in voltage providing unit 100 There is poor contact or instantaneous power failure occurs etc. and make the first input voltage that voltage providing unit 100 exports that wink occur Between change, such as moment drops to 7V from 15V and returns 15V, when the first input voltage drops to 7V, is less than the second threshold voltage VD2, then first node voltage VQ1 is less than the first enabled voltage VE1 at this time, to enable port EN voltage quasi position again smaller than the One enabled voltage VE1, the first integrated chip 2000 do not work；When the first input voltage is returned to 15V again from 7V, at this time First input voltage has reached the second threshold voltage VD2, and enable port EN is enabled, and the first integrated chip 2000 is reworked.
In the present invention, the first integrated chip 2000 has different demand voltages, driving according to different function situations Circuit 1000 determines a variety of different working modes, and further determines that the different threshold input voltage of the first integrated chip 2000. In general, threshold input voltage becomes larger with becoming larger for demand voltage, that is, when demand voltage is larger, corresponding threshold is defeated It is also larger to enter voltage；When demand voltage is smaller, corresponding threshold input voltage is also smaller.Under each operating mode, only When the first input voltage has reached threshold input voltage at this time, it can make the enable port with the first integrated chip 2000 The voltage of first control node Q1 of EN couplings reaches the first enabled voltage VE1, and the first integrated chip 2000 could be made to work, It avoids because the voltage quasi position of change the first input voltage moment, enable port EN hour still is able to reach the first enabled voltage VE1, to which the first integrated chip 2000 continues to work and improves duty ratio to work normally, in the first input voltage wink Between reply when originally inputting voltage and generate instantaneous large-current, cause to the first integrated chip 2000 itself and its with electric device 3000 Damage risk.
In practical operation, corresponding first collection is set before use, experiment can be first passed through in the driving circuit 1000 of the present invention At the threshold input voltage of the different demands voltage of chip 2000.So, in driving circuit 1000 in use, when determining the After the current demand voltage of one integrated chip 2000, you can quickly determine corresponding current demand voltage by previous setting Threshold input voltage.It is illustrated so that the demand voltage of the first integrated chip 2000 is the first demand voltage as an example, first needs It is, for example, 20V to seek voltage.When the voltage that the input port VIN of the first integrated chip 2000 is received is the first demand voltage When, the duty ratio of the first integrated chip 2000 reaches for example, 30%.Then by received by the first integrated chip 2000 One input voltage moment was transferred to the first voltage value from 20V and is returned to 20V again, and the first voltage value can be chosen more during the experiment A experiment value.When the first input voltage drops to the first voltage value from 20V, it is assumed that the first integrated chip 2000 continues work at this time Make, and in order to work normally, the duty ratio of the first integrated chip 2000 becomes larger compared to duty ratio before, reaches 35%, when First input voltage is returned to 20V from the first voltage value moment, and the first integrated chip 2000 needs some reaction time could Duty ratio is become again 30% from 35%, in the meantime the first integrated chip 2000 and its with electric device 3000 that the moment born is big Electric current, when determine the instantaneous large-current be the first integrated chip 2000 and its with electric device 3000 can bear maximum safety electricity When stream, you can determine that the selected the first voltage value of current experiment is the minimum safe voltage of the first integrated chip 2000, then may be used Using the minimum safe voltage as the threshold input voltage of corresponding first demand voltage.That is, in the need of the first integrated chip 2000 When voltage being asked to be determined as the first demand voltage, it can bear most according to the first integrated chip 2000 and its with electric device 3000 Big safe current determines the acceptable minimum safe voltage of the first integrated chip 2000, which is set For the first threshold voltage VD1.When the demand voltage of the first integrated chip 2000 be other values when, equally can using aforesaid way come The selected of corresponding threshold input voltage is carried out, is not repeated separately.
So, when driving circuit 1000 works, even if the first input voltage that voltage providing unit 100 is exported Instantaneous variation occurs, since the different demands voltage of corresponding first integrated chip 2000 sets different threshold input voltages, If the instantaneous variation range of the first input voltage is between demand voltage and corresponding threshold input voltage, such as moment is from 20V It drops to 17V and returns 20V, since 17V is more than corresponding threshold input voltage (being, for example, 16V in the present embodiment), then first collects It works at chip 2000, and even if the first input voltage will appear slightly larger electric current when being returned to demand voltage again, But according to the previous experiment electric current still in the first integrated chip 2000 and its safety electricity that can bear with electric device 3000 It flows in range, the first integrated chip 2000 and its is not damaged and can be worked normally with electric device 3000.And when first The instantaneous variation range of input unit has been more than the range between demand voltage and corresponding threshold input voltage, for example, moment from 20V drops to 7V and returns 20V, and since 7V is less than corresponding threshold input voltage (being, for example, 16V in the present embodiment), then first collects It no longer works in voltage instantaneous change hour at chip, to prevent from will appear when the first input voltage is returned to demand voltage again Instantaneous large-current and damage the first integrated chip 2000 and its with electric device 3000.Because the instantaneous large-current is more than the first collection Except the safe current range that can bear at chip 2000 and its with electric device 3000, if 2000 work of the first integrated chip Make, it will be damaged.
As shown in Fig. 2, protection location 200 includes the first partial pressure unit 210 and the second partial pressure unit 220, the first partial pressure is single Member 210 has opposite first end and second end, and it (is specially voltage providing unit which, which couples voltage providing unit 100, 100 output end), second end couples the first control node Q1, and the voltage for defining 210 both ends of the first partial pressure unit is first point Pressure, is denoted as VF1；Second partial pressure unit 220 is connected with the first partial pressure unit 210, and the second partial pressure unit 220 has opposite third End and the 4th end, the third end couple the second end of the first partial pressure unit 210, the 4th end ground connection.It is single to define the second partial pressure The voltage at first 220 both ends is the second partial pressure, is denoted as VF2, and the first input voltage is denoted as V1, the first partial pressure and the second partial pressure and Equal to the first input voltage, i.e. V1=VF1+VF2.In the present embodiment, first node voltage VQ1 is equal to the second partial pressure.And it is logical Cross such mode so that the voltage quasi position and voltage providing unit that the enable port EN of the first integrated chip 2000 can be obtained 100 the first input voltages for being exported are directly related.
In the present embodiment, effective resistance value of the first partial pressure unit 210 is first unit resistance value, is denoted as R1, and the second partial pressure is single Effective resistance value of member 220 is second unit resistance value, is denoted as R2, then meets：VF2/V1=R2/ (R1+R2).That is, first node is electric Press VQ1=V1*R2/ (R1+R2).In practical operation, the effective resistance value that can define protection location 200 is total resistance value, is denoted as R0, then Above-mentioned equation can be rewritten as first node voltage VQ1=V1*R2/R0.The size of first node voltage VQ1 and the first input voltage Size and second unit resistance value it is related in the accounting of total resistance value of protection location 200.Second unit resistance value be can define in guarantor The accounting for protecting total resistance value of unit 200 is the first accounting, and the enable port EN of the first integrated chip 2000 couplings first control Node Q1 can then obtain, the voltage quasi position of the enable port EN of the first integrated chip 2000 depends on the first input voltage and the The size of one accounting.
In the present invention, when the demand voltage of the first integrated chip 2000 is different, then driving circuit 1000 determines different works Operation mode, the second partial pressure can be different from the ratio of the first input voltage.Specifically, the need when the first integrated chip 2000 can be passed through When seeking voltage difference, second unit resistance value different mode is realized.For example, the demand voltage when the first integrated chip 2000 is When the first demand voltage, the first demand voltage is, for example, 20V, and second unit resistance value can be 8.18k Ω, and first unit resistance value can be 100k Ω, to which the ratio of the second partial pressure and the first input voltage is equal to total resistance value of second unit resistance value and protection location 200 Ratio be 8.18/ (8.18+10)=0.0756.When the demand voltage of the first integrated chip 2000 is the second demand voltage When, the second demand voltage is, for example, 15V, and first unit resistance value can be 100k Ω, and second unit change in resistance is 12.36k Ω, from And the ratio of the second partial pressure and the first input voltage is equal to second unit resistance value and the ratio of total resistance value of protection location 100 is 12.36/ (100+12.36)=0.11.In general, above-mentioned second partial pressure and the ratio of the first input voltage can be with first integrated The becoming smaller for demand voltage of chip 2000 and increase, to, when the demand voltage of the first integrated chip 2000 is larger, voltage carries Exporting matched first input voltage for unit 100 will be larger, and due to the second partial pressure (i.e. first node voltage VQ1) and the The ratio of one input voltage is smaller at this time, therefore needs the first input voltage when reaching larger threshold voltage, enable port EN's Voltage quasi position can reach the first enabled voltage VE1, and when the demand voltage of the first integrated chip 2000 is smaller, voltage carries Exporting matched first input voltage for unit 100 will be smaller, and due to the second partial pressure (i.e. first node voltage VQ1) and the The ratio of one input voltage is larger at this time, therefore needs the first input voltage when reaching smaller threshold voltage, enable port EN's Voltage quasi position can reach the first enabled voltage VE1.In other words, the threshold input electricity of the first integrated chip 2000 of the invention Pressure can become larger with becoming larger for its demand voltage.
In practical operation, the first partial pressure unit 210 may include the first quantity resistance, the first number amount≤1st.First number Amount resistance can be used for example concatenated mode and connect.Second partial pressure unit 220 may include the second quantity resistance, second number Liang≤2, the second quantity resistance equally can be used for example concatenated mode and connects.
As shown in Fig. 2, in the present embodiment, the first partial pressure unit 210 may include 1 resistance, be defined as first resistor 211, First resistor 211 has the first resistance value, is denoted as r1, and the first resistance value is equal to above-mentioned first unit resistance value, i.e. R1=r1.The present embodiment In, the first resistance value of first resistor 211 is 100k Ω.Second partial pressure unit 220 may include 2 concatenated resistance, define respectively For second resistance 221 and 3rd resistor 222, second resistance 221 has the second resistance value, is denoted as r2, and 3rd resistor 222 has third Resistance value is denoted as r3.In the present embodiment, the second resistance value of second resistance 221 is 8.18k Ω, and the third resistance value of 3rd resistor 222 is 4.18kΩ。
When the demand voltage of the first integrated chip 2000 is the first demand voltage (being 20V in the present embodiment), then electricity is driven Road 1000 determine the first operating mode, at this point, second unit resistance value be equal to the second resistance value, i.e. R2=r2, according to second partial pressure with The ratio of first input voltage is equal to the ratio of second unit resistance value and total resistance value of protection location 200, you can obtains：VF2/V1 =R2/ (R1+R2)=r2/ (r1+r2).Thus VF2/V1=0.0756 is calculated, to reach first when the first input voltage When threshold voltage VD1 (being 16V in the present embodiment), first node voltage VQ1=16*0.0756V=1.21V has reached first Enabled voltage VE1, enable port EN can be enabled.
When the demand voltage of the first integrated chip 2000 is the second demand voltage (being 15V in the present embodiment), then electricity is driven Road 1000 determines the second operating mode, is equal to second unit resistance value and protection according to the second partial pressure and the ratio of the first input voltage The ratio of total resistance value of unit 200, you can obtain：
VF2/V1=R2/ (R1+R2)=(r2+r3)/(r1+r2+r3).Thus it calculates, VF2/V1=0.11, thus from And when the first input voltage reaches the second threshold voltage VD2 (being 11V in the present embodiment), first node voltage VQ1=11* 0.11V=1.21V, has reached the first enabled voltage VE1, and enable port EN can be enabled.
It is illustrated in the method that above-mentioned different second unit resistance value is obtained under different working modes below.As shown in Fig. 2, protecting Protecting unit 200, also there is the second control node Q2, control unit 300 also to have the first output end out1, the first output end out1 For exporting the first level signal, the first output end out1 couples the second control node Q2, one end of second resistance 221 be this The other end at three ends, second resistance 221 couples the second control node Q2, and one end of 3rd resistor 222 couples the second control node Q2, the other end ground connection of 3rd resistor 222.When the demand voltage of the first integrated chip 2000 is the first demand voltage, driving Circuit 1000 determines that the first operating mode, first output end out1 of the control of control unit 300 export the first level signal, at this time the One level signal is low level signal, and the second control node Q2 is pulled low, to the first control of one end coupling of second resistance 221 Node, the other end can be considered ground connection, so that the effective resistance that the second partial pressure unit 220 is included is only second resistance 221, therefore the Two unit resistance values are equal to the second resistance value of second resistance 221, i.e. R2=r2；When the demand voltage of the first integrated chip 2000 is the When two demand voltages, driving circuit 1000 determines the second operating mode, the first deferent segment out1 of control of control unit 300 outputs the One level signal, the first level signal is high level signal at this time, and the second control node Q2 maintains normal high potential, so that second The effective resistance that partial pressure unit 220 is included is concatenated second resistance 221 and 3rd resistor 222, therefore second unit resistance value etc. In the sum of the third resistance value of the second resistance value and 3rd resistor 222 of second resistance 221, i.e. R2=(r2+r3).Thus, in Under different working modes, driving circuit 1000 controls the current potential of the second control node Q2 by different level signals is exported, To change effective resistance included in the second partial pressure unit 220, to obtain different second unit resistance values.
In the present embodiment, the first partial pressure unit 210 only includes first resistor 211, therefore first unit resistance value is fixed value, together When under different working modes the second unit resistance value of the second partial pressure unit 220 be changing value, under different working modes, Second unit resistance value is different in the accounting of total resistance value of protection location 200, to realize the demand voltage of the first integrated chip 2000 Bigger, threshold input voltage is bigger.It, also can be by the first unit resistance value of the first partial pressure unit 210 and in practical operation The second unit resistance value of two partial pressure units 220 is disposed as the first unit resistance value of changing value or the first partial pressure unit 210 Second unit resistance value for changing value while the second partial pressure unit 220 is fixed value.It can only can realize the first integrated chip 2000 demand voltage is bigger, and threshold input voltage is bigger, when the first input voltage reaches corresponding threshold input voltage, The voltage quasi position of enable port EN reaches the first enabled voltage VE1.
In practical operation, in order to further increase driving circuit 1000 and the first integrated chip 2000 job stability and Safety, as shown in Fig. 2, also there is control unit 300 first control terminal c1, the first control terminal c1 to couple voltage providing unit 100.When determining the current demand voltage of the first integrated chip 2000 according to current function situation, driving circuit 1000 is first The first level signal is provided to protection location by the first output end out1 of control unit 300 according to the current demand voltage 200, with the corresponding current operation mode of determination.Due to the threshold of corresponding first integrated chip 2000 under different operating modes Input voltage is different, after determining current operation mode, you can determines the threshold input voltage of corresponding current operation mode.Then it drives Dynamic circuit 1000 provides first voltage signal extremely further according to the current demand voltage by the first control terminal c1 of control unit 300 Voltage providing unit 100, voltage providing unit 100 export the first input of matching current demand voltage according to first voltage signal Voltage.So, when the input port VIN of the first integrated chip 2000 receives exported from voltage providing unit 100 When the first input voltage with current demand voltage, it can be ensured that current threshold input voltage has been adjusted to and current demand electricity Matched state is pressed, so that driving circuit 1000 more stably works.
In practical operation, in order to further increase driving circuit 1000 and the first integrated chip 2000 job stability and Safety, as shown in Fig. 2, also there is control unit 300 second control terminal c2, the second control terminal c2 to couple the first integrated chip 2000 enable port EN.In the present embodiment, second control terminal c2 the first control node Q1 of coupling, and the first control node Q1 couplings Enable port EN is met, to realize the coupling of the second control terminal c2 and enable port EN.It is determined according to current function situation After the current demand voltage of first integrated chip 2000, driving circuit 1000 first passes through control unit according to the current demand voltage 300 the first output end out1 provides the first level signal to protection location 200, with the corresponding current operation mode of determination, from And determine the threshold input voltage of corresponding current operation mode.Then the second control that driving circuit 1000 passes through control unit 300 End c2 processed exports high level signal, and enable port EN is opened, in order to reach corresponding work at present when the first input voltage When the threshold input voltage of pattern, the work of the first integrated chip 2000.In the present embodiment, the second control terminal c2 is similar to enable port The switch of EN, when the second control terminal c2 exports high level signal, then enable port EN is opened, to receive the first control node Q1's First node voltage VQ1, and can be enabled when first node voltage VQ1 reaches the first enabled voltage VE1 so that first is integrated Chip 2000 works；And when the second control terminal c2 exports low level signal, then enable port EN is closed, no matter the first input at this time Whether voltage reaches threshold input voltage, and the first integrated chip 2000 does not work.So, when the first integrated chip 2000 Input port VIN receive from the first input voltage of the matching current demand voltage that voltage providing unit 100 exports when, can be true Driving circuit 1000 is protected to determine current operation mode according to current demand voltage and set corresponding threshold input electricity Pressure, it is ensured that current threshold input voltage has been adjusted to the state with current demand voltage matches, so that driving circuit 1000 more stably work.
In the present embodiment, the first partial pressure unit 210 includes 1 resistance, and the second partial pressure unit 220 includes 2 resistance, protection Include two control nodes in unit 200, there are two types of second unit resistance values for the second partial pressure unit 220 tool, to driving circuit There are two types of operating modes for 1000 tools, and for the first integrated chip 2000 tool, there are two types of switchings when different demands voltage to use.Practical behaviour In work, the first quantity and the second quantity can be other values, have a variety of (being more than two) controls to which protection location 200 corresponds to Node so that the second partial pressure unit 220 can have a variety of (being more than two) second unit resistance values, to which driving circuit 1000 has A variety of (being more than two kinds) operating modes, switching use when there is a variety of different demands voltages for the first integrated chip 2000.
Please refer to Fig.3 and Fig. 4, Fig. 3 be the present invention driving circuit another embodiment block diagram；Fig. 4 is Fig. 3 The schematic diagram of middle protection location.In the present embodiment, the first partial pressure unit 210 only includes still 1 resistance, is defined as first resistor 211, first resistor 211 has the first resistance value, is denoted as r1, and in the present embodiment, the first resistance value is equal to above-mentioned first unit resistance value, i.e., R1=r1.Unlike the embodiment in Fig. 2, in the present embodiment, the second partial pressure unit 220 ' has concatenated 5 resistance, It is respectively defined as second resistance 221,3rd resistor 222, the 4th resistance 223, the 5th resistance 224 and the 6th resistance 225, protection is single Member 200, which corresponds to, has the second control node Q2, third control node Q3, the 4th control node Q4 and the 5th control node Q5, the One end of two resistance 221 is the third end of the second partial pressure unit 220, the second control of other end coupling of second resistance 221 One end of node Q2,3rd resistor 222 couple the second control node Q2, the other end coupling third control section of 3rd resistor 222 One end of point Q3, the 4th resistance 223 couple third control node Q3, and the other end of the 4th resistance 223 couples the 4th control node One end of Q4, the 5th resistance 224 couple the 4th control node Q4, and the other end of the 5th resistance 224 couples the 5th control node Q5, One end of 6th resistance 225 couples the 5th control node Q5, the other end ground connection of the 6th resistance 225.Driving circuit 1000 ' also wraps Containing control unit 300 ', control unit 300 ' have the first output end out1, second output terminal out2, third output end out3 and 4th output end out4, the first output end out1 couple the second control node Q2, second output terminal out2 coupling third control sections Point Q3, third output end out3 couple the 4th control node Q4, and the 4th output end out4 couples the 5th control node Q5.
When so that the demand voltage of the first integrated chip 2000 is the first demand voltage according to current function situation, Driving circuit 1000 ' first passes through control unit 300 ' according to first demand voltage and sends the first level signal, to control first Output end out1 exports low level signal, and second output terminal out2, third output end out3 and the 4th output end out4 outputs are high Level signal sends the work that the first level signal determines driving circuit 1000 ' to first pass through the first integrated chip 300 ' Pattern is the first operating mode, and determines that the threshold input voltage of the first integrated chip 2000 is first according to the first operating mode Threshold voltage VD1.In the present embodiment, the first demand voltage is 20V.Since the first output end out1 exports low level signal, and The output of other output ends is high level signal, then the second control node Q2 with the first output end out1 couplings is pulled low, Remaining control node maintains normal high potential, so that one end of second resistance 221 couples the first control node Q1, the other end can It is considered as ground connection, so that the effective resistance that the second partial pressure unit 220 ' is included is only second resistance 221, therefore second unit resistance value etc. In the resistance value of second resistance 221.In the present embodiment, the resistance value of first resistor 211 is, for example, 100k Ω, the resistance of second resistance 222 Value for example, 8.18k Ω, the first enabled voltage VE1 is 1.21V, when reaching the first threshold voltage VD1 according to the first input voltage, First node voltage VQ1 reaches the first enabled voltage VE1, then 1.21=V1*8.18/ (100+8.18) is obtained, to calculate Under first operating mode, when first node voltage VQ1 reaches the first enabled voltage VE1, the first input voltage is 16V, at this time First input voltage reaches the first threshold voltage VD1, i.e. the first threshold voltage VD1 of the first integrated chip 2000 is 16V.Then The first control terminal c1 that driving circuit 1000 ' controls control unit 300 ' according to first demand voltage sends first voltage signal To voltage providing unit 100, voltage providing unit 100 is according to the output of first voltage signal and the first demand voltage matched first Input voltage.In the present embodiment, the first input voltage at this time can be equal to the first demand voltage, as 20V.
When so that the demand voltage of the first integrated chip 2000 is the second demand voltage according to current function situation, Driving circuit 1000 ' first passes through control unit 300 ' according to second demand voltage and sends second electrical level signal, to control first Output end out1, third output end out3 and the 4th output end out4 export high level signal, and second output terminal out2 outputs are low Level signal sends the operating mode that second electrical level signal determines driving circuit 1000 ' to first pass through control unit 300 ' For the second operating mode, and determine that the threshold input voltage of the first integrated chip 2000 is the second threshold according to the second operating mode Voltage VD2.In the present embodiment, the second demand voltage is 15V.Due to the third control node Q3 quilts of the second input terminal out2 couplings It dragging down, remaining control node maintains normal high potential, so that one end of 3rd resistor 222 couples the second control node Q2, The other end can be considered ground connection, so that the effective resistance that the second partial pressure unit 220 ' is included is second resistance 221 and 3rd resistor 222, therefore second unit resistance value is equal to the sum of the resistance value of second resistance 221 and 3rd resistor 222.In the present embodiment, first resistor 211 resistance value is 100k Ω, and the resistance value of second resistance 221 is 8.18k Ω, and the resistance value of 3rd resistor 222 is 4.18k Ω, first Enabled voltage VE1 is 1.21V, and when reaching the second threshold voltage VD2 according to the first input voltage, first node voltage VQ1 reaches First enabled voltage VE1, then obtain：
1.21=V1* (8.18+4.18)/(100+8.18+4.18)；
So that it is determined that go out under the second operating mode, when first node voltage VQ1 reaches the first enabled voltage VE1, first Input voltage is 11V, and the first input voltage reaches the second threshold voltage VD2 at this time, that is, determines the first integrated chip 2000 Second threshold voltage VD2 is 11V.Then driving circuit 1000 ' controls the of control unit 300 ' according to second demand voltage One control terminal c1 sends second voltage signal to voltage providing unit 100, and voltage providing unit 100 is defeated according to second voltage signal Go out and matched first input voltage of the second demand voltage.In the present embodiment, the first input voltage at this time can be needed equal to second Ask voltage, as 15V.
When so that the demand voltage of the first integrated chip 2000 is third demand voltage according to current function situation, Driving circuit 1000 ' first passes through control unit 300 ' according to the third demand voltage and sends third level signal, to control first Output end out1, second output terminal out2 and the 4th output end out4 export high level signal, and the out3 outputs of third output end are low Level signal determines that the operating mode of driving circuit 1000 ' is to first pass through the transmission of control unit 300 ' third level signal Third operating mode, and determine that the threshold input voltage of the first integrated chip 2000 is third threshold electricity according to third operating mode VD3 is pressed, and third threshold voltage VD3 is less than the second threshold voltage VD2.In the present embodiment, third demand voltage is 12V.Due to 4th control node Q4 of third input terminal out3 couplings is pulled low, remaining control node maintains normal high potential, so that One end of 4th resistance 223 couples third control node Q3, and the other end can be considered ground connection, so that the second partial pressure unit 220 ' is wrapped The effective resistance contained is second resistance 221,3rd resistor 222 and the 4th resistance 223, therefore second unit resistance value is equal to second resistance 221, the sum of the resistance value of 3rd resistor 222 and the 4th resistance 223.In the present embodiment, the resistance value of first resistor 211 is 100k Ω, 221 resistance value of second resistance is 8.18k Ω, and the resistance value of 3rd resistor 222 is 4.18k Ω, and the resistance value of the 4th resistance 223 is 5.46k Ω, the first enabled voltage VE1 are 1.21V, when reaching third threshold voltage VD3 according to the first input voltage, first node voltage VQ1 reaches the first enabled voltage VE1, then obtains：1.21=V1* (8.18+4.18+5.46)/(100+8.18+4.18+5.46). So that it is determined that go out under third operating mode, when first node voltage VQ1 reaches the first enabled voltage VE1, the first input voltage For 8V, the first input voltage reaches third threshold voltage VD3 at this time, that is, determines the third threshold electricity of the first integrated chip 2000 Pressure VD3 is 8V.Then driving circuit 1000 ' controls the first control terminal c1 hairs of control unit 300 ' according to the third demand voltage Send tertiary voltage signal to voltage providing unit 100, voltage providing unit 100 is according to the output of tertiary voltage signal and third demand First input voltage of voltage matches.In the present embodiment, the first input voltage at this time can be equal to third demand voltage, as 12V。
When so that the demand voltage of the first integrated chip 2000 is four demand voltage according to current function situation, Driving circuit 1000 ' first passes through control unit 300 ' according to the 4th demand voltage and sends the 4th level signal, to control first Output end out1, second output terminal out2 and third output end out3 export high level signal, and the 4th output end out4 outputs are low Level signal determines that the operating mode of driving circuit 1000 ' is to first pass through the 4th level signal of the transmission of control unit 300 ' 4th operating mode, and determine that the threshold input voltage of the first integrated chip 2000 is the 4th threshold electricity according to the 4th operating mode VD4 is pressed, and the 4th threshold voltage VD4 is less than third threshold voltage VD3.In the present embodiment, the 4th demand voltage is 9V.Due to 5th control node Q5 of four input terminal out3 couplings is pulled low, remaining control node maintains normal high potential, so that the One end of five resistance 224 couples the 4th control node Q4, and the other end can be considered ground connection, so that the second partial pressure unit 220 ' is included Effective resistance be second resistance 221,3rd resistor 222, the 4th resistance 223 and the 5th resistance 224, therefore second unit resistance value Equal to second resistance 221, the sum of the resistance value of 3rd resistor 222, the 4th resistance 223 and the 5th resistance 224.In the present embodiment, the The resistance value of one resistance 211 is 100k Ω, and 221 resistance value of second resistance is 8.18k Ω, and the resistance value of 3rd resistor 222 is 4.18k Ω, The resistance value of 4th resistance 223 is 5.46k Ω, and the resistance value of the 5th resistance 224 is 14.11k Ω, and the first enabled voltage VE1 is 1.21V, when reaching the 4th threshold voltage VD4 according to the first input, first node voltage VQ1 reaches the first enabled voltage VE1, then It obtains：1.21=V1* (8.18+4.18+5.46+14.11)/(100+8.18+4.18+5.46+14.11).Determine the 4th work Under operation mode, when first node voltage VQ1 reaches the first enabled voltage VE1, the first input voltage is 5V, at this time the first input Voltage reaches third threshold voltage VD3, that is, determines that the first threshold voltage VD2 of the first integrated chip 2000 is 5V.Then it drives The first control terminal c1 that dynamic circuit 1000 ' controls control unit 300 ' according to the 4th demand voltage sends the 4th voltage signal extremely Voltage providing unit 100, voltage providing unit 100 export defeated with the 4th demand voltage matched first according to the 4th voltage signal Enter voltage, in the present embodiment, the first input voltage at this time can be equal to the 4th demand voltage, as 9V.
When so that the demand voltage of the first integrated chip 2000 is five demand voltage according to current function situation, Driving circuit 1000 ' first passes through control unit 300 ' according to the 5th demand voltage and sends the 5th level signal, to control first Output end out1, second output terminal out2, third output end out3 and the 4th output end out4 export high level signal, to first The 5th level signal, which is sent, by control unit 300 ' determines that the operating mode of driving circuit 1000 ' is the 5th operating mode, and The threshold input voltage of the first integrated chip 2000 is determined as the 5th threshold voltage VD5 according to the 5th operating mode, and the 5th Sill voltage VD5 is less than the 4th threshold voltage VD4.In the present embodiment, the 5th demand voltage is 5V.Since all control nodes are all tieed up Normal high potential is held, one end of the 6th resistance 225 couples the 5th control node Q5, other end ground connection, so that the second partial pressure unit 220 ' the effective resistances for being included are second resistance 221,3rd resistor 222, the 4th resistance 223, the 5th resistance 224 and the 6th Resistance 225, therefore second unit resistance value is equal to second resistance 221,3rd resistor 222, the 4th resistance 223, the 5th resistance 224 and the The sum of the resistance value of six resistance 225.In the present embodiment, the resistance value of first resistor 211 is 100k Ω, and 221 resistance value of second resistance is The resistance value of 8.18k Ω, 3rd resistor 222 are 4.18k Ω, and the resistance value of the 4th resistance 223 is 5.46k Ω, the resistance of the 5th resistance 224 Value is 14.11k Ω, and the resistance value of the 6th resistance 225 is 2.74k Ω, and the first enabled voltage VE1 is 1.21V, according to the first input electricity When pressure reaches the 5th threshold voltage VD5, first node voltage VQ1 reaches the first enabled voltage VE1, then obtains：1.21=V1* (8.18+4.18+5.46+14.11+2.74)/(100+8.18+4.18+5.46+14.11+2.74).Determine the 5th Working mould Under formula, when first node voltage VQ1 reaches the first enabled voltage VE1, the first input voltage is 4.7V, at this time the first input electricity Pressure reaches the 5th threshold voltage VD5, that is, determines that the 5th threshold voltage VD5 of the first integrated chip 2000 is 4.7V.Then it drives The first control terminal c1 that dynamic circuit 1000 ' controls control unit 300 ' according to the 5th demand voltage sends the 5th voltage signal extremely Voltage providing unit 100, voltage providing unit 100 export defeated with the 5th demand voltage matched first according to the 5th voltage signal Enter voltage, in the present embodiment, the first input voltage at this time can be equal to the 5th demand voltage, as 5V.
Thus, under different working modes, driving circuit 1000 controls each by different level signals is exported The current potential of a control node, to change effective resistance included in the second partial pressure unit 220 ', to obtain different the Two unit resistance values so that second partial pressure at 220 ' both ends of the second partial pressure unit is different from the ratio of the first input voltage.
The driving circuit of the present invention determines a variety of different operatings according to the different demand voltages of the first integrated chip Pattern, and further determine that the different threshold input voltage of the first integrated chip.Threshold input voltage with demand voltage change Become larger greatly.Under each operating mode, only when the first input voltage has reached threshold input voltage at this time, it can make The voltage of the first control node that is coupled with the enable port of the first integrated chip reach the first enabled voltage, could make the One integrated chip works, and avoids because the first input voltage moment voltage quasi position for becoming hour enable port still is able to reach the One enabled voltage, to which the first integrated chip continues to work and improves duty ratio to work normally, in the first input electricity Pressure moment replys when originally inputting voltage and generates instantaneous large-current, causes to the first integrated chip itself and its with the damage of electric device The risk of wound.
By the above detailed description of preferred embodiments, it is intended to more clearly describe the feature of the present invention and spirit, And not protection scope of the present invention is limited with above-mentioned disclosed preferred embodiment.On the contrary, its purpose It is intended to cover various changes and has being arranged in the scope of the claims of the invention to be applied of equality.Cause This, the apllied scope of the claims of the present invention should illustrate the most wide explanation of work according to above-mentioned, to cause it Cover all possible change and the arrangement of tool equality.

Claims (10)

1. a kind of driving circuit, for driving the first integrated chip, first integrated chip that there is input port and enable port, First integrated chip has the first enabled voltage, it is characterised in that the driving circuit includes：
Voltage providing unit couples the input port, and the voltage providing unit is for providing the first input voltage；And
Protection location couples the output end of the voltage providing unit, which has the first control node, first control Node couples the enable port, and it is first node voltage to define the voltage at first control node；
Wherein, when the demand voltage of first integrated chip is the first demand voltage, then the driving circuit corresponds to first need It seeks voltage and determines the first operating mode, and further determine that the threshold input voltage of first integrated chip is the first threshold electricity Pressure, when first input voltage reaches first threshold voltage, which reaches the first enabled voltage, this One integrated chip works；
When the demand voltage of first integrated chip is the second demand voltage, which is less than first demand electricity Pressure, then the driving circuit corresponds to second demand voltage and determines the second operating mode, and further determines that the first integrated core The threshold input voltage of piece is the second threshold voltage, which is less than first threshold voltage, when this is first defeated When entering voltage and reaching second threshold voltage, which reaches the first enabled voltage, the first integrated chip work Make.
2. driving circuit according to claim 1, it is characterised in that：When the driving circuit is in first operating mode When, if first input voltage is less than first threshold voltage, which is less than the first enabled voltage, this One integrated chip does not work；When the driving circuit is in second operating mode, if first input voltage be less than this second Threshold voltage, then the first node voltage be less than the first enabled voltage, which does not work.
3. driving circuit according to claim 2, it is characterised in that：The protection location includes：
There is first partial pressure unit opposite first end and second end, the first end to couple the output end of the voltage providing unit, The second end couples first control node, and the voltage for defining the first partial pressure unit both ends is the first partial pressure；And
Second partial pressure unit is connected with first partial pressure unit, which has opposite third end and the 4th end, The third end couples the second end, and the voltage of the 4th end ground connection, the second partial pressure unit both ends divides for second, this first point Pressure and second partial pressure and be equal to first input voltage, which is equal to second partial pressure, this is first integrated When the demand voltage difference of chip, second partial pressure is different from the ratio of first input voltage.
4. driving circuit according to claim 3, it is characterised in that：Effective resistance value of first partial pressure unit is first single First resistance value, is denoted as R1, and effective resistance value of second partial pressure unit is second unit resistance value, R2 is denoted as, by first input voltage It is denoted as V1, which is denoted as VF2, then is met：VF2/V1=R2/ (R1+R2), the demand electricity of first integrated chip When pressing different, the second unit resistance value is different.
5. driving circuit according to claim 4, it is characterised in that：First partial pressure unit includes the first quantity electricity Resistance, the first number amount≤1st, second partial pressure unit include the second quantity resistance, the 2nd number amount≤2.
6. driving circuit according to claim 5, it is characterised in that：First partial pressure unit includes 1 resistance, is defined as The resistance value of first resistor, the first resistor is the first resistance value, which is equal to first resistance value, and second partial pressure is single Member includes concatenated 2 resistance, is respectively defined as second resistance and 3rd resistor, and the resistance value of the second resistance is the second resistance value, The resistance value of the 3rd resistor is third resistance value, wherein when the driving circuit is in first operating mode, second unit resistance Value is equal to second resistance value；When the driving circuit is in second operating mode, which is equal to second resistance Value with the third resistance value and.
7. driving circuit according to claim 6, it is characterised in that：The protection location also has the second control node, should Driving circuit also includes control unit, which has the first output end, and first output end is for exporting the first level Signal, first output end couple second control node, and one end of the second resistance is the third end, the second resistance it is another One end couples second control node, and one end of the 3rd resistor couples second control node, the other end of the 3rd resistor For the 4th end, wherein when the driving circuit is in first operating mode, which is low level signal, The effective resistance that second partial pressure unit is included is the second resistance, and the second unit resistance value is made to be equal to second resistance value；When When the driving circuit is in second operating mode, which is high level signal, which is wrapped The effective resistance contained is the second resistance and the 3rd resistor, so that the second unit resistance value is equal to second resistance value and is hindered with the third The sum of value.
8. driving circuit according to claim 7, it is characterised in that：The control unit also has the first control terminal, this One control terminal couples the voltage providing unit, in use, the control unit is first according to the demand voltage of first integrated chip There is provided the first level signal to the protection location by first output end, with determine the driving circuit operating mode and this The threshold input voltage of one integrated chip, then the control unit according to the demand voltage pass through first control terminal provide electricity Press signal to the voltage providing unit, which exports matched first input voltage according to the voltage signal.
9. driving circuit according to claim 8, it is characterised in that：The control unit also has the second control terminal, this Two control terminals couple the enable port of first integrated chip, in use, the control unit is first according to first integrated chip The demand voltage provide the first level signal to the protection location, to determine the work of the driving circuit by first output end The threshold input voltage of operation mode and first integrated chip, then first control terminal export high level signal.
10. driving circuit according to claim 5, it is characterised in that：First partial pressure unit includes 1 resistance, definition Resistance value for first resistor, the first resistor is the first unit resistance value, which includes 5 resistance of series connection, point It is not defined as second resistance, 3rd resistor, the 4th resistance, the 5th resistance and the 6th resistance, which also has the second control One end of node, third control node, the 4th control node and the 5th control node processed, the second resistance is the third end, should The other end of second resistance couples second control node, and one end of the 3rd resistor couples second control node, the third The other end of resistance couples the third control node, and one end of the 4th resistance couples the third control node, the 4th resistance The other end couple the 4th control node, one end of the 5th resistance couples the 4th control node, the 5th resistance it is another One end couples the 5th control node, and one end of the 6th resistance couples the 5th control node, the other end of the 6th resistance Ground connection, the driving circuit also include control unit, the control unit have the first control terminal, the first output end, second output terminal, Third output end and the 4th output end, first control terminal couple the voltage providing unit, first output end couple this second Control node, the second output terminal couple the third control node, which couples the 4th control node, and the 4th Output end couples the 5th control node, wherein
When the demand voltage of first integrated chip is first demand voltage, then the driving circuit corresponds to first demand Voltage sends out the first level signal by the control unit, exports low level signal to control first output end, this is second defeated Outlet, the third output end and the 4th output end export high level signal, so that it is determined that going out the operating mode of the driving circuit For first operating mode, and further determine that the threshold input voltage is first threshold voltage, the second unit hinders at this time Value controls voltage providing unit output and matches first threshold voltage equal to the resistance value of the second resistance, the then control unit First input voltage；
When the demand voltage of first integrated chip is second demand voltage, then the driving circuit corresponds to second demand Voltage sends out second electrical level signal by the control unit, defeated to control first output end, the third output end and the 4th Outlet exports high level signal, which exports low level signal, so that it is determined that going out the operating mode of the driving circuit For second operating mode, and further determine that the threshold input voltage is second threshold voltage, the second unit hinders at this time Value controls voltage providing unit output equal to the sum of the resistance value of the second resistance and the 3rd resistor, the then control unit First input voltage with second threshold voltage；
When the demand voltage of first integrated chip is third demand voltage, which is less than second demand electricity Pressure, then the driving circuit corresponds to the third demand voltage and sends out third level signal by the control unit, with control this first Output end, the second output terminal and the 4th output end export high level signal, which exports low level signal, from And determine that the operating mode of the driving circuit is third operating mode, and further determine that the threshold input voltage is third door Sill voltage, the third threshold voltage are less than second threshold voltage, at this time the second unit resistance value be equal to the second resistance, this The sum of the resistance value of three resistance and the 4th resistance, then the control unit control the voltage providing unit output match the third door First input voltage of sill voltage；
When the demand voltage of first integrated chip is the 4th demand voltage, the 4th demand voltage is less than the third demand electricity Pressure, then the driving circuit corresponds to the 4th demand voltage and sends out the 4th level signal by the control unit, with control this first Output end, the second output terminal and the third output end export high level signal, and the 4th output end exports low level signal, from And determine that the operating mode of the driving circuit is the 4th operating mode, and further determine that the threshold input voltage is the 4th Sill voltage, the 4th threshold voltage are less than the third threshold voltage, at this time the second unit resistance value be equal to the second resistance, this The sum of the resistance value of three resistance, the 4th resistance and the 5th resistance, then the control unit control the voltage providing unit output Match first input voltage of the 4th threshold voltage；
When the demand voltage of first integrated chip is the 5th demand voltage, the 5th demand voltage is less than the 5th demand electricity Pressure, then the driving circuit corresponds to the 5th demand voltage and sends out the 5th level signal by the control unit, with control this first Output end, the second output terminal, the third output end and the 4th output end export high level signal, so that it is determined that going out the driving The operating mode of circuit be the 5th operating mode, and further determine that the threshold input voltage be the 5th threshold voltage, the 5th Threshold voltage is less than the 4th threshold voltage, and the second unit resistance value has equal to the second resistance, the 3rd resistor, is somebody's turn to do at this time The sum of the resistance value of 4th resistance and the 5th resistance, then the control unit control the voltage providing unit output matching the 5th First input voltage of threshold voltage.
CN201810549420.3A 2018-05-31 2018-05-31 Driving circuit Expired - Fee Related CN108768353B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810549420.3A CN108768353B (en) 2018-05-31 2018-05-31 Driving circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810549420.3A CN108768353B (en) 2018-05-31 2018-05-31 Driving circuit

Publications (2)

Publication Number Publication Date
CN108768353A true CN108768353A (en) 2018-11-06
CN108768353B CN108768353B (en) 2022-05-17

Family

ID=64001220

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810549420.3A Expired - Fee Related CN108768353B (en) 2018-05-31 2018-05-31 Driving circuit

Country Status (1)

Country Link
CN (1) CN108768353B (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000048122A (en) * 1998-12-15 2000-07-25 다카노 야스아키 Liquid crystal driving integrated circuit
CN103247250A (en) * 2013-05-13 2013-08-14 深圳市华星光电技术有限公司 Display module, light source module as well as driving circuit and driving method of light source module
CN103379705A (en) * 2012-04-28 2013-10-30 福建捷联电子有限公司 Driving device of LED tube
CN104768259A (en) * 2014-01-02 2015-07-08 深圳市海洋王照明工程有限公司 Adaptive LED boost driving circuit
WO2016080052A1 (en) * 2014-11-18 2016-05-26 ソニー株式会社 Data driver, display device, and electronic device
CN106507560A (en) * 2015-09-07 2017-03-15 力林科技股份有限公司 light-emitting diode backlight module and driving device thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000048122A (en) * 1998-12-15 2000-07-25 다카노 야스아키 Liquid crystal driving integrated circuit
CN103379705A (en) * 2012-04-28 2013-10-30 福建捷联电子有限公司 Driving device of LED tube
CN103247250A (en) * 2013-05-13 2013-08-14 深圳市华星光电技术有限公司 Display module, light source module as well as driving circuit and driving method of light source module
CN104768259A (en) * 2014-01-02 2015-07-08 深圳市海洋王照明工程有限公司 Adaptive LED boost driving circuit
WO2016080052A1 (en) * 2014-11-18 2016-05-26 ソニー株式会社 Data driver, display device, and electronic device
CN106507560A (en) * 2015-09-07 2017-03-15 力林科技股份有限公司 light-emitting diode backlight module and driving device thereof

Also Published As

Publication number Publication date
CN108768353B (en) 2022-05-17

Similar Documents

Publication Publication Date Title
CN1732612B (en) Device and method for providing over-voltage protection during power up of DC-DC converter
CN102160271B (en) Control method for power control circuit, power supply unit, power supply system, and power controller control method
DE19958934B4 (en) Engine control unit
CN2836301Y (en) Reverse connection prevention circuit for power supply
DE102015106156A1 (en) Cable quality detection and power consumer devices
CN208386120U (en) Current foldback circuit with foldback circuit
CN205490115U (en) Switching power supply circuit
CN108768353A (en) driving circuit
CN201039123Y (en) Seamless cascading multi-channel power on control circuit
CN108599100A (en) A kind of ON-OFF control circuit and load switch
CN207503307U (en) The driving control system of three-phase commutator
US20220271556A1 (en) Current control for multi-port charging circuit
US20220140595A1 (en) Short to Ground Protection and Automatic Recovery
JP5667495B2 (en) Positioner
CN214412262U (en) Protection circuit, circuit board and protection system
CN108418301A (en) A kind of automatic switch-over circuit of dual power supply input
DE10155847A1 (en) Procedure for the diagnosis of output stages in control units
CN108811265B (en) Power supply circuit
CN113466661A (en) High-side driving circuit diagnosis method and diagnosis device
KR20020016398A (en) Over voltage protection circuit for backlight inverter of LCD
CN206947944U (en) Printer head power supply circuit and printer
CN106533164B (en) DC to DC converter and fault protecting method
CN210469267U (en) Isolated multi-protection discrete magnitude output circuit
CN207977735U (en) The short-circuit protection circuit of power supplier
CN205753961U (en) Two-way pulse width modulation switching circuit

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20220517

CF01 Termination of patent right due to non-payment of annual fee