CN209526657U - A kind of slope control circuit - Google Patents
A kind of slope control circuit Download PDFInfo
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- CN209526657U CN209526657U CN201920050310.2U CN201920050310U CN209526657U CN 209526657 U CN209526657 U CN 209526657U CN 201920050310 U CN201920050310 U CN 201920050310U CN 209526657 U CN209526657 U CN 209526657U
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Abstract
This application provides a kind of slope control circuits, comprising: the variable capacitor of first diode D1, first resistor R1 and capacitance.Wherein, voltage input end of the first end of first resistor R1 as slope control circuit, the second end of first resistor R1 are connected with the first end of the anode of first diode D1 and capacitor respectively, the second end ground connection of capacitor.The cathode of first diode D1 is the DC supply input of the slope control circuit, voltage output end of the common end of the first end of the anode and capacitor of first diode D1 as slope control circuit.The circuit of above structure can export the voltage signal of linear rise.
Description
Technical field
This application involves semiconductor integrated circuit technology field more particularly to a kind of slope control circuits.
Background technique
Overvoltage protection chip in current mobile phone, plate and other electronic equipments using more and more extensive.Over-voltage
The over-voltage behavior of protection chip directly influences the effect of protection, wherein Toff (time off, turn-off time) is to measure over-voltage
Protect an important indicator of chip.Currently, often being needed for the Toff performance of the various overvoltage protection chips of lateral comparison in the industry
A kind of input signal of reference is wanted, but the amplitude of the input signal and the rate of rise all there are certain requirements, such as: certain USB high
The overvoltage protection switch of fast signal, test condition are input signals from 0~16V, are risen with the slope of 10V/100ns,
And the timing since over-voltage set-point (such as setting over-voltage voltage is in 6V), until switch disconnection, and then measures Toff performance.
How to generate the input signal with different high level and different climbing speeds is chance during measurement overvoltage protection chip
The problem to be solved arrived.
For the input signal of amplitude and the rate of rise required for how being generated for overvoltage protection chip, in the prior art
The slope control circuit that can use RC (Resistor-Capacitor, resistance-capacitor) filter generates exponential form
Input signal, but in some test scenes, it needs to provide the input signal of linear rise, therefore, mesh for overvoltage protection chip
How preceding be those skilled in the art's technical problem urgently to be resolved for the input signal of overvoltage protection chip generation linear rise.
Utility model content
This application provides a kind of slope control circuits, it is therefore intended that solves how to generate the voltage signal of linear rise
Problem.
To achieve the goals above, this application provides following technical schemes:
A kind of slope control circuit, comprising:
The capacitor that first diode D1, first resistor R1 and capacitance can be changed；
Voltage input end of the first end of the first resistor R1 as the slope control circuit；
The second end of the first resistor R1 respectively with the anode of the first diode D1 and the first end of the capacitor
It is connected；
The second end of the capacitor is grounded；
The cathode of the first diode D1 is the DC supply input of the slope control circuit；
The common end of the first end of the anode and capacitor of the first diode D1 is as the slope control circuit
Voltage output end.
Optionally, the capacitor includes:
Capacitance group；
The capacitance group includes the access capacitor of N number of parallel connection, any one of access capacitor include concatenated capacitor and
Switch, the first end of the switch are connected with the capacitor, second end ground connection；
In the case where described close the switch, the access capacitor accesses slope control circuit, disconnects in the switch
In the case of, the access capacitor does not access the slope control circuit.
Optionally, further includes:
Second diode D2；
Voltage input end of the anode of the second diode D2 as the slope control circuit, second diode
The cathode of D2 is connected with the first end of the first resistor R1.
Optionally, further includes:
Second resistance R2；
The first end of the second resistance R2 is connected with the first end of N number of access capacitor in the capacitance group, institute
The second end for stating second resistance R2 is connected with the second end of the switch in the capacitance group.
Optionally, the N is 4.
Optionally, further includes:
Second resistance R2；
The first end of the second resistance R2 is connected with the capacitor, second end ground connection.
Optionally, the capacitor includes:
Tunable capacitor.
Optionally, the voltage input end receives input voltage from high voltage power supply.
Optionally, the cathode of the D1 receives DC voltage from DC power supply.
Optionally, the voltage output end is connected with the input terminal of overvoltage protection chip.
Slope control circuit provided by the present application, comprising: the variable electricity of first diode D1, first resistor R1 and capacitance
Hold.Wherein, voltage input end of the first end of first resistor R1 as slope control circuit, the second end difference of first resistor R1
It is connected with the first end of the anode of first diode D1 and capacitor, the second end ground connection of capacitor.The cathode of first diode D1 is
The DC supply input of the slope control circuit, the common end conduct of the first end of the anode and capacitor of first diode D1
The voltage output end of slope control circuit.The circuit of above structure can export the voltage signal of linear rise.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of application for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is that slope control circuit provided by the embodiments of the present application applies the signal in the test scene of overvoltage protection chip
Figure；
Fig. 2 is a kind of integrated circuit figure of slope control circuit disclosed in the embodiment of the present application；
Fig. 3 is the equivalent circuit diagram of system ESD generator disclosed in the embodiment of the present application；
Fig. 4, which is that the embodiment of the present application is disclosed, is based on different target voltage VCLAMPUnder output voltage VOUTWaveform diagram；
Fig. 5 is the integrated circuit figure of another kind slope control circuit disclosed in the embodiment of the present application.
Specific embodiment
Slope control circuit provided by the present application, applied to include: in scene as indicated with 1, in Fig. 1 DC power supply 10,
High voltage power supply 11, slope control circuit 12, overvoltage protection chip 13 and oscillograph 14, slope control circuit 12 provided by the present application
First voltage input terminal VIN be connected with high voltage power supply 11, the second voltage input terminal VCLAMP of slope control circuit 12 and straight
Galvanic electricity source 10 is connected, and the voltage output end VOUT of slope control circuit 12 is connected with the input terminal of overvoltage protection chip 13, oscillography
The voltage output end VOUT of the first end connection slope control circuit 12 of device 14, the second end of oscillograph 14 connect overvoltage protection core
The output end of piece 13.Specifically, DC power supply 10 is that slope control circuit 12 provides target voltage VCLAMP, high voltage power supply 11 is oblique
Rate control circuit 12 provides the voltage V of a high pressureIN, the voltage output end VOUT output output voltage of slope control circuit 12
VOUT, and by output voltage VOUTInput signal as overvoltage protection chip 13 is input to overvoltage protection chip 13, oscillograph 14
For detecting the input/output signal of overvoltage protection chip 13, it may be assumed that the voltage signal at detection 13 both ends of overvoltage protection chip.
The purpose of slope control circuit provided by the present application is, the input electricity of linear rise is generated for overvoltage protection chip
Press signal.
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.It is based on
Embodiment in the application, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall in the protection scope of this application.
As shown in Fig. 2, the embodiment of the present application provides a kind of slope control circuit, comprising: first diode D1, the two or two
Pole pipe D2, first resistor R1, second resistance R2 and capacitance group.
Wherein, capacitance group includes: first capacitor C1 and concatenated first switch S1, the second capacitor C2 and concatenated
Two switch S2, third capacitor C3 and concatenated third switch S3, the 4th capacitor C4 and concatenated 4th switch S4, it is concatenated
Capacitor and switch constitute access capacitor in parallel, access capacitor for any one, in the case where closing the switch, access capacitor
Slope control circuit is accessed, in the case where switching disconnection, access capacitor does not access slope control circuit.
Voltage input end VIN of the anode of second diode D2 as slope control circuit receives high voltage power supply 11 and provides
Input voltage VIN；The cathode of second diode D2 is connected with the first end of first resistor R1, the second end point of first resistor R1
Not with the anode of the second diode D1, the first end of first capacitor C1, the first end of the second capacitor C2, third capacitor C3 first
The first end of end and the 4th capacitor C4 are connected, first resistor R1, first diode D1, first capacitor C1, the second capacitor C2, the
The common end of three capacitor C3 and the 4th capacitor C4 is connected with the first end of second resistance R2, the second end of first capacitor C1 with it is corresponding
First switch S1 first end be connected, the second end of the second capacitor C2 and the first end of corresponding second switch S2 are connected, the
The second end of three capacitor C3 is connected with the first end of corresponding third switch S3, the second end of the 4th capacitor C4 and the corresponding 4th
The first end of switch S4 is connected, the second end of first switch S1, the second end of second switch S2, the second end of third switch S3,
The second end of 4th switch S4 is connected with the second end of second resistance R2, first switch S1, second switch S2, third switch S3,
The common end grounding of 4th switch S4 and second resistance R2；Direct current of the cathode of first diode D1 as slope control circuit
Source input terminal VCLAMP receives the target voltage V that DC power supply 10 providesCLAMP, target voltage VCLAMPFor slope control circuit
Be actually subjected to output voltage；Voltage output end VOUT of the first end of second resistance R2 as slope control circuit.
First diode D1 is used for the target voltage V provided by DC power supplyCLAMPOutput to voltage output end VOUT
Voltage VOUTClamper is carried out, i.e., as the output voltage V of voltage output end VOUTOUTThe target voltage V provided higher than DC power supplyCLAMP
When, then first diode D1 forward conduction, by the output voltage V of voltage output end VOUTOUTThe mesh that clamper is provided in DC power supply
Mark voltage VCLAMPWith the voltage of the sum of first diode D1 pressure drop left and right.
Second diode D2 is for preventing voltage output end VOUT to the back discharge of voltage input end VIN, it may be assumed that in high pressure
The high tension voltage of power input is exchange, may when the voltage of voltage input end VIN is less than the voltage of voltage output end VOUT
The reverse current from voltage output end VOUT to voltage input end VIN can be generated, the second diode D2 effect in this is mainly
Anti- influence of the reverse current to circuit here.
First resistor R1 is current-limiting resistance, for so that the electric current being applied in capacitance group is a perseverance within the object time
Fixed electric current.
It should be noted that due to first resistor R1 electric current be the both ends first resistor R1 voltage and resistance value quotient, it is defeated
Entering voltage is thousands of V, and output voltage variation is tens volts, and therefore, the variation of the voltage output end VOUT in Fig. 2 is for voltage
It can ignore for input terminal VIN, then be approximately the both ends for being applied to first resistor R1 with constant voltage, therefore, generate one
The electric current of approximately constant.
Capacitance group is used to adjust the output electricity of voltage output end VOUT according to the capacitor being linked into slope control circuit
Press VOUTLinear rise slope.
Second resistance R2 is discharge resistance, and the output voltage VO UT for voltage output end VOUT is clamped at DC power supply
When the target voltage VCLAMP of offer, discharge slope control circuit.
Slope control circuit described in the embodiment of the present application can the progress overvoltage protection chip input of coupled system ESD generator
The generation of signal, the internal circuit of system ESD generator is as shown in figure 3, include high voltage power supply UC, the first internal resistance RC, it is internal
Capacitor CSWith internal output resistance Rd, in open system ESD generator, internal capacitance CSOn high pressure pass through internal output
Resistance RdIt is exported outward, it should be noted that internal capacitance CSOn voltage be generally 2KV~10KV or higher.
In one embodiment, the configuration parameter of slope control circuit 12 is as follows: first resistor R1 is 5.1K Ω, second resistance
R2 is 1K Ω, and the capacitance C in capacitance group C1~C4 is 10nF, and only first switch S1 is closed, and system ESD generator 11 is made
It is that slope control circuit 12 provides high pressure for high voltage power supply, voltage is set as 8KV, the DC power supply 10 of slope control circuit 12
The target voltage V of inputCLAMP15 are set as, setting is tested according to mono- ladder of 5V.
Under configuration parameter in the present embodiment described above, it is known that, the equivalent current of slope control circuit 12 is I=UC/(R1
+ Rd), wherein UCFor the output voltage of system ESD generator, R1 is the resistance value of first resistor R1, and Rd is internal output resistance
RdResistance value, it may be assumed that equivalent current I=8KV/ (5.1K Ω+0.33K Ω)=1.47A of slope control circuit 12.
Under above-mentioned configuration parameter, due to there was only first switch S1 closure, then there was only first capacitor C1 access in capacitance group,
The capacitance then accessed in slope control circuit 12 is 1C, i.e. access capacitance is 10nF, then can obtain output voltage VOUTIt is upper
Rising slope is about k1=I/C=1.47A/10nF=14.7V/100ns, that is, every 100ns output voltage rises 14.7V.
In another embodiment, the configuration parameter of slope control circuit 12 is as follows: first resistor R1 is 5.1K Ω, the second electricity
Resistance R2 is 1K Ω, and the capacitance C in capacitance group C1~C4 is 10nF, and first switch S1 and second switch S2 is closed, system ESD
Generator 11 is that slope control circuit 12 provides high pressure as high voltage power supply, and voltage is again set at 8KV, slope control circuit
The target voltage V that 12 DC power supply 10 inputsCLAMPIt is set as 15V, setting is tested according to mono- ladder of 5V.
Under configuration parameter in the present embodiment described above, it is known that, the equivalent current of slope control circuit 12 is I=UC/(R1
+ Rd), wherein UCFor the output voltage of system ESD generator, R1 is the resistance value of first resistor R1, and Rd is internal output resistance
RdResistance value, it may be assumed that equivalent current I=8KV/ (5.1K Ω+0.33K Ω)=1.47A of slope control circuit 12.
Under above-mentioned configuration parameter, since first switch S1 and second switch S2 is closed, then first capacitor C1 and second is electric
Hold C2 access, then access the capacitance C+2C=3C in slope control circuit 12, is i.e. access capacitance is 30nF, then can obtain defeated
Voltage V outOUTThe rate of rise be about k2=I/3C=1.47A/30nF=4.9V/100ns, that is, every 100ns output electricity
Pressure rises 4.9V.
In summary, output voltage VOUTLinear rise slope k mainly by Fig. 2 switch S1~S4 control be linked into
What the size of the total capacitance C in slope control circuit 12 determined, it can be adjusted according to practical application.
For the output voltage V of comprehensive account for voltage output end VOUTOUTEffect, can pass through adjust slop control electricity
Road is to target voltage VCLAMPIt is emulated, is based on different target voltage VCLAMPUnder output voltage VOUTWaveform as shown in figure 4,
Wherein, horizontal axis is time shaft, and the longitudinal axis is output voltage VOUT, may indicate that from the emulation in Fig. 4 in different target voltage VCLAMP
Under, output voltage VOUTTarget voltage V can be reached with identical linear gradientCLAMPThe voltage of left and right, meets overvoltage protection chip
The requirement of linear gradient and amplitude to output voltage.
It should be noted that the output voltage V of voltage output end VOUTOUTPass through the defeated of target voltage input terminal VCLAMP
Voltage V outOUTTarget voltage VCLAMPClamper is carried out, as output voltage VOUTHigher than target voltage VCLAMPWhen, first diode D1
Forward conduction, by output voltage VOUTClamper is in target voltage VCLAMPAdd the voltage of first diode D1 pressure drop or so.Therefore, lead to
Overregulate target voltage VCLAMPDifferent output voltage V can directly be adjusted outOUTEffect.
It should be noted that Fig. 2 is a kind of specific embodiment including the second diode D2 in the embodiment of the present application,
In another specific embodiment, above-mentioned second diode D2 be optional device, it may be assumed that high voltage power supply input high tension voltage be direct current
When, then the input voltage V of voltage input end VININThe consistently greater than output voltage V of voltage output end VOUTOUT, will not in circuit
Above-mentioned back discharge is generated, therefore, in slope control circuit can not include the second diode D2.
Optionally, the quantity of the capacitor in capacitance group is not limited to 4, and tunable capacitor also can be used in capacitor.
It should be noted that second resistance R2 is optional, it may be assumed that can not include second resistance in slope control circuit
R2 can manually discharge for slope control circuit.
Fig. 5 is the slope control circuit for not including optional device, comprising: first diode D1, first resistor R1 and electricity
The variable capacitor of capacitance.
Wherein, the variable capacitor of capacitance can be capacitance group described in above-described embodiment, or tunable capacitor.
As shown in figure 5, the first end of first resistor R1 is as oblique so that the capacitor that capacitance can be changed is tunable capacitor C as an example
The voltage input end VIN of rate control circuit receives the input voltage V that high voltage power supply 11 providesIN；The second end of first resistor R1 point
It is not connected with the first end of the anode of first diode D1, tunable capacitor C, the second end ground connection of tunable capacitor C；First diode
DC supply input VCLAMP of the cathode of D1 as slope control circuit receives the target voltage that DC power supply 10 provides
VCLAMP, target voltage VCLAMPFor the voltage for being actually subjected to output of slope control circuit；First diode D1's is positive and adjustable
Voltage output end VOUT of the common end of the first end of capacitor C as slope control circuit.
Slope control circuit provided in this embodiment, when the high tension voltage of high voltage power supply input is direct current, then voltage is defeated
Enter to hold the input voltage V of VININThe consistently greater than output voltage V of voltage output end VOUTOUT, will not generate in circuit above-mentioned reversed
Electric discharge；Furthermore it is possible to manually discharge for slope control circuit, therefore, Fig. 5 compares slope control shown in Fig. 2
Circuit processed eliminates the second diode D2 and second resistance R2, and circuit structure is simple, and cost is relatively low.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with it is other
The difference of embodiment, same or similar part may refer to each other between each embodiment.
The foregoing description of the disclosed embodiments makes professional and technical personnel in the field can be realized or use the application.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the application.Therefore, the application
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of slope control circuit characterized by comprising
The capacitor that first diode D1, first resistor R1 and capacitance can be changed；
Voltage input end of the first end of the first resistor R1 as the slope control circuit；
The second end of the first resistor R1 is connected with the first end of the anode of the first diode D1 and the capacitor respectively；
The second end of the capacitor is grounded；
The cathode of the first diode D1 is the DC supply input of the slope control circuit；
Electricity of the common end of the first end of the anode and capacitor of the first diode D1 as the slope control circuit
Press output end.
2. slope control circuit according to claim 1, which is characterized in that the capacitor includes:
Capacitance group；
The capacitance group includes the access capacitor of N number of parallel connection, and any one of access capacitor includes concatenated capacitor and switch,
The first end of the switch is connected with the capacitor, second end ground connection；
In the case where described close the switch, the access capacitor accesses slope control circuit, the case where the switch disconnects
Under, the access capacitor does not access the slope control circuit.
3. slope control circuit according to claim 2, which is characterized in that further include:
Second diode D2；
Voltage input end of the anode of the second diode D2 as the slope control circuit, the second diode D2's
Cathode is connected with the first end of the first resistor R1.
4. slope control circuit according to claim 3, which is characterized in that further include:
Second resistance R2；
The first end of the second resistance R2 is connected with the first end of N number of access capacitor in the capacitance group, and described the
The second end of two resistance R2 is connected with the second end of the switch in the capacitance group.
5. slope control circuit according to claim 3, which is characterized in that the N is 4.
6. slope control circuit according to claim 1, which is characterized in that further include:
Second resistance R2；
The first end of the second resistance R2 is connected with the capacitor, second end ground connection.
7. slope control circuit according to claim 1, which is characterized in that the capacitor includes: tunable capacitor.
8. slope control circuit according to claim 1-7, which is characterized in that
The voltage input end receives input voltage from high voltage power supply.
9. slope control circuit according to claim 1-7, which is characterized in that
The cathode of the D1 receives DC voltage from DC power supply.
10. slope control circuit according to claim 1-7, which is characterized in that
The voltage output end is connected with the input terminal of overvoltage protection chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920050310.2U CN209526657U (en) | 2019-01-11 | 2019-01-11 | A kind of slope control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920050310.2U CN209526657U (en) | 2019-01-11 | 2019-01-11 | A kind of slope control circuit |
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| CN209526657U true CN209526657U (en) | 2019-10-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109639134A (en) * | 2019-01-11 | 2019-04-16 | 上海艾为电子技术股份有限公司 | A kind of slope control circuit |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109639134A (en) * | 2019-01-11 | 2019-04-16 | 上海艾为电子技术股份有限公司 | A kind of slope control circuit |
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