CN112631366A - Control circuit and control method for continuous piecewise linear current - Google Patents

Control circuit and control method for continuous piecewise linear current Download PDF

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CN112631366A
CN112631366A CN202011346397.1A CN202011346397A CN112631366A CN 112631366 A CN112631366 A CN 112631366A CN 202011346397 A CN202011346397 A CN 202011346397A CN 112631366 A CN112631366 A CN 112631366A
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郭玉华
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Basaltic Semiconductor Wuhan Co ltd
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    • G05CONTROLLING; REGULATING
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    • G05F3/02Regulating voltage or current
    • G05F3/08Regulating voltage or current wherein the variable is dc
    • G05F3/10Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics
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Abstract

The invention discloses a control circuit and a control method of continuous piecewise linear current, wherein the control circuit of the continuous piecewise linear current comprises a reference current source module, an operational amplifier module and a current adder module which are used for generating a plurality of paths of currents with different magnitudes, and the reference current source module and the current adder module are electrically connected with the operational amplifier module. According to the control circuit of the continuous piecewise linear current, the output current of the reference current source module is controlled through the operational amplifier module according to the comparison slope voltage and the multi-path preset voltage, and then the multi-path output current is added and combined through the current adder module to obtain the continuous piecewise linear current, so that the current piecewise point and the piecewise slope can be flexibly set according to the number and the voltage of different operational amplifiers in the operational amplifier module, the universality is high, and the control circuit can be used for any functional module needing slope control.

Description

Control circuit and control method for continuous piecewise linear current
Technical Field
The invention belongs to the technical field of analog circuit control, and particularly relates to a control circuit and a control method for continuous piecewise linear current.
Background
Slope control and slope compensation are functions often used in analog integrated circuit design, and the slope control circuit is commonly used in gate driving, slew rate control, delay circuits and the like of power tubes. Slope compensation is usually used for stability compensation of a PWM control circuit, and in a common PWM peak current mode control circuit, when a system PWM duty ratio is larger than 50%, a loop circuit has an unstable problem.
In order to perform slope control on current or voltage or perform slope compensation on a loop, both functions need to generate piecewise linear current or voltage, so that an accurate control circuit and method for generating piecewise linear current are needed.
Disclosure of Invention
In order to solve the above problems, the present invention provides a control circuit for a continuous piecewise linear current, which flexibly sets a current piecewise point and a piecewise slope, has strong versatility, and can be used for any functional module requiring slope control.
Another object of the present invention is to provide a control method.
The technical scheme adopted by the invention is as follows:
a control circuit of continuous piecewise linear current comprises a reference current source module, an operational amplifier module and a current adder module, wherein the reference current source module, the operational amplifier module and the current adder module are used for generating multiple paths of currents with different sizes, the reference current source module and the current adder module are electrically connected with the operational amplifier module, the operational amplifier module controls the size of output current of the reference current source module according to the comparison slope voltage and the multiple paths of preset voltage, and then the multiple paths of output current are added and combined through the current adder module to obtain the continuous piecewise linear current.
Preferably, the operational amplifier module comprises a first operational amplifier module OTA1, a second operational amplifier module OTA2 and a third operational amplifier module OTA3, and the first operational amplifier module OTA1, the second operational amplifier module OTA2 and the third operational amplifier module OTA3 are all connected to the reference current source module and the current adder module.
Preferably, the reference current source module includes a first MOS transistor, a second MOS transistor, a third MOS transistor, and a fourth MOS transistorFour MOS tubes and reference current source IBIASThe reference current source IBIASThe grid electrode of the first MOS tube is connected with the drain electrode of the first MOS tube, the grid electrode of the second MOS tube, the grid electrode of the third MOS tube and the grid electrode of the fourth MOS tube in parallel, and the source electrode of the first MOS tube, the source electrode of the second MOS tube, the source electrode of the third MOS tube and the source electrode of the fourth MOS tube are all connected with the power supply.
Preferably, the first operational amplifier module OTA1 includes a fifth MOS transistor and a sixth MOS transistor, the second operational amplifier module OTA2 includes a seventh MOS transistor and an eighth MOS transistor, the third operational amplifier module OTA3 includes a ninth MOS transistor and a tenth MOS transistor, the source electrode of the fifth MOS transistor and the source electrode of the sixth MOS transistor are both connected to the drain electrode of the second MOS transistor, the source electrode of the seventh MOS transistor and the source electrode of the eighth MOS transistor are both connected to the drain electrode of the third MOS transistor, the source electrode of the ninth MOS transistor and the source electrode of the tenth MOS transistor are both connected to the drain electrode of the fourth MOS transistor, the gate electrode of the sixth MOS transistor is connected to the first voltage V1, the gate electrode of the eighth MOS transistor is connected to the second voltage V2, the gate electrode of the tenth MOS transistor is connected to the third voltage V3, and the gate electrodes of the fifth MOS transistor, the seventh MOS transistor and the ninth MOS transistor are all connected to the slope voltage V1slope
Preferably, the current adder module includes an eleventh MOS transistor, a twelfth MOS transistor and a thirteenth MOS transistor, a drain of the fifth MOS transistor, a drain of the seventh MOS transistor and a drain of the ninth MOS transistor are both a drain and a gate of the eleventh MOS transistor, a drain of the sixth MOS transistor, a drain of the eighth MOS transistor and a drain of the tenth MOS transistor are all connected to a drain and a gate of the twelfth MOS transistor and a gate of the thirteenth MOS transistor, a source of the eleventh MOS transistor, a source of the twelfth MOS transistor and a source of the thirteenth MOS transistor are all grounded, and a drain of the thirteenth MOS transistor outputs a continuous segmented linear current Islope
Preferably, the first MOS transistor, the second MOS transistor, the third MOS transistor and the fourth MOS transistor are PMOS transistors.
Preferably, the fifth MOS transistor, the sixth MOS transistor, the seventh MOS transistor, the eighth MOS transistor, the ninth MOS transistor, and the tenth MOS transistor are PMOS transistors.
Preferably, the eleventh MOS transistor, the twelfth MOS transistor and the thirteenth MOS transistor are all NMOS transistors.
Preferably, the voltage value of the first voltage V1 is smaller than that of the second voltage V2, and the voltage value of the second voltage V2 is smaller than that of the third voltage V3.
The other technical scheme of the invention is realized as follows:
a control method of a control circuit applying the continuous piecewise linear current comprises the following steps:
s1, generating a plurality of paths of currents with different sizes by the reference current source module;
s2, the operational amplifier module controls the output current of the reference current source module in the S1 according to the comparison slope voltage and the multi-path preset voltage;
and S3, adding and combining the multi-path output current in the S2 by the current adder module to obtain continuous piecewise linear current.
Compared with the prior art, the control circuit of the continuous piecewise linear current controls the output current of the reference current source module according to the comparison slope voltage and the multi-path preset voltage by the operational amplifier module, and then adds and combines the multi-path output current by the current adder module to obtain the continuous piecewise linear current, so that the current piecewise point and the piecewise slope can be flexibly set according to the number and the voltage of different operational amplifiers in the operational amplifier module, the universality is strong, and the control circuit can be used for any functional module needing slope control.
Drawings
Fig. 1 is a schematic circuit structure diagram of a control circuit for continuous piecewise linear current provided in embodiment 1 of the present invention;
fig. 2 is a circuit diagram of a control circuit for a continuous piecewise linear current provided in embodiment 1 of the present invention;
FIG. 3 is a diagram illustrating a slope voltage V of a control circuit for a continuous piecewise linear current according to embodiment 1 of the present inventionslopeA circuit schematic of (a);
FIG. 4 is a drawing for providingA circuit diagram slope voltage V of a control circuit for continuous piecewise linear currentslopeAnd a piecewise linear current IslopeA schematic diagram of (a);
fig. 5 is a schematic diagram of current variations of linear currents I1, I2, I3 of a control circuit for continuous piecewise linear current provided in embodiment 1 of the present invention;
FIG. 6 shows the piecewise linear current I of the control circuit for continuous piecewise linear current provided in embodiment 1 of the present inventionslopeSchematic diagram of the current change of (1).
Description of the reference numerals
The current-sharing circuit comprises a 1-reference current source module, 11-a first MOS tube, 12-a second MOS tube, 13-a third MOS tube, 14-a fourth MOS tube, a 2-operational amplifier module, 21-a fifth MOS tube, 22-a sixth MOS tube, 23-a seventh MOS tube, 24-an eighth MOS tube, 25-a ninth MOS tube, 26-a tenth MOS tube, a 3-current adder module, 31-an eleventh MOS tube, 32-a twelfth MOS tube and 33-a thirteenth MOS tube.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The embodiment 1 of the present invention provides a control circuit for continuous piecewise linear current, as shown in fig. 1 to 6, including a reference current source module 1, an operational amplifier module 2, and a current adder module 3, where the reference current source module 1 and the current adder module 3 are both electrically connected to the operational amplifier module 2, the operational amplifier module 2 controls the magnitude of the output current of the reference current source module 1 according to the magnitude of a comparison slope voltage and a plurality of preset voltages, and further adds and combines the plurality of output currents through the current adder module 3 to obtain the continuous piecewise linear current.
Therefore, the output current of the reference current source module 1 is controlled by the operational amplifier module 2 according to the comparison slope voltage and the multi-path preset voltage, and then the multi-path output current is added and combined by the current adder module 3 to obtain continuous piecewise linear current, so that current segmentation points and segmentation slopes can be flexibly set according to the number and the voltage of different operational amplifiers in the operational amplifier module, the universality is strong, and the method can be used for any functional module needing slope control.
The operational amplifier module 2 comprises a first operational amplifier module OTA1, a second operational amplifier module OTA2 and a third operational amplifier module OTA3, and the first operational amplifier module OTA1, the second operational amplifier module OTA2 and the third operational amplifier module OTA3 are all connected with the reference current source module 1 and the current adder module 3.
Thus, the slope voltage V is compared by the first operational amplifier module OTA1slopeAnd the magnitude of the first voltage V1, linear adjustment control K1*IBIASA current, outputting a first current I1; comparing the slope voltage V by the second operational amplifier module OTA2slopeAnd the magnitude of the second voltage V2, linear adjustment control K2*IBIASCurrent, outputting a second current I2; comparing the slope voltage V by the third operational amplifier module OTA3slopeAnd magnitude of the third voltage V3, linear adjustment control K3*IBIASOutputting a third current I3, and adding and combining the first current I1, the second current I2 and the third current I3 through a current adder module 3 to obtain a continuous piecewise linear current Islope
The reference current source module 1 comprises a first MOS transistor 11, a second MOS transistor 12, a third MOS transistor 13, a fourth MOS transistor 14 and a reference current source IBIASThe reference current source IBIASThe other end of the first MOS tube 11 is connected with the drain electrode of the first MOS tube 11, the grid electrode of the second MOS tube 12, the grid electrode of the third MOS tube 13 and the grid electrode of the fourth MOS tube 14 in parallel, and the source electrode of the first MOS tube 11, the source electrode of the second MOS tube 12, the source electrode of the third MOS tube 13 and the source electrode of the fourth MOS tube 14 are all connected with the power supply. The first MOS transistor 11, the second MOS transistor 12, the third MOS transistor 13, and the fourth MOS transistor 14 are PMOS transistors.
Thus, the current source I is referenced by the first MOS transistor 11BIASThe current of the first MOS transistor 11 is mirrored through the second MOS transistor 12, the third MOS transistor 13 and the fourth MOS transistor 14, so as to provide multiple paths of currents with different magnitudes for the operational amplifier module 2.
The first operational amplifier module OTA1 includes a fifth MOS transistor 21 and a sixth MOS transistor 22, the second operational amplifier module OTA2 includes a seventh MOS transistor 23 and an eighth MOS transistor 24, the third operational amplifier module OTA3 includes a ninth MOS transistor 25 and a tenth MOS transistor 26, the source electrode of the fifth MOS transistor 21 and the source electrode of the sixth MOS transistor 22 are both connected to the drain electrode of the second MOS transistor 12, the source electrode of the seventh MOS transistor 23 and the source electrode of the eighth MOS transistor 24 are both connected to the drain electrode of the third MOS transistor 13, the source electrode of the ninth MOS transistor 25 and the source electrode of the tenth MOS transistor 26 are both connected to the drain electrode of the fourth MOS transistor 14, the gate of the sixth MOS transistor 22 is connected to a first voltage V1, the gate of the eighth MOS transistor 24 is connected to a second voltage V2, the gate of the tenth MOS transistor 26 is connected to a third voltage V3, and the gates of the fifth MOS transistor 21, the seventh MOS transistor 23 and the ninth MOS transistor 25 are all connected to a slope voltage V.slope. The fifth MOS transistor 21, the sixth MOS transistor 22, the seventh MOS transistor 23, the eighth MOS transistor 24, the ninth MOS transistor 25, and the tenth MOS transistor 26 are PMOS transistors. The voltage value of the first voltage V1 is smaller than that of the second voltage V2, and the voltage value of the second voltage V2 is smaller than that of the third voltage V3.
In this way, the first linear current I1 is output through the drain of the sixth MOS transistor 22, the second linear current I2 is output through the drain of the eighth MOS transistor 24, and the third linear current I3 is output through the drain of the tenth MOS transistor 26.
The current adder module 3 comprises an eleventh MOS transistor 31, a twelfth MOS transistor 32 and a thirteenth MOS transistor 33, the drain of the fifth MOS transistor 21, the drain of the seventh MOS transistor 23 and the drain of the ninth MOS transistor 25 are the drain and the gate of the eleventh MOS transistor 31, the drain of the sixth MOS transistor 22, the drain of the eighth MOS transistor 24 and the drain of the tenth MOS transistor 26 are all connected to the drain and the gate of the twelfth MOS transistor 32 and the gate of the thirteenth MOS transistor 33, the source of the eleventh MOS transistor 31, the source of the twelfth MOS transistor 32 and the source of the thirteenth MOS transistor 33 are all grounded,the drain electrode of the thirteenth MOS tube 33 outputs a continuous piecewise linear current Islope. The eleventh MOS transistor 31, the twelfth MOS transistor 32 and the thirteenth MOS transistor 33 are all NMOS transistors.
Thus, by reference to current source IBIASProducing linear current magnitude, i.e. K, between different segments1*IBIAS、K1*IBIAS、K1*IBIASThen designed by adopting proper circuit parameters and passes through VslopeThe regulation of the control voltage (i.e. the operational amplifier module 2) is combined via a twelfth MOS transistor 32, and finally IslopeAnd is output from the drain of the thirteenth MOS transistor 33.
The reference current source module 1 is used for converting a reference current source I into a reference current sourceBIASThe relation of the width-length ratio of the first MOS tube 11 to the second MOS tube 12, the third MOS tube 13 and the fourth MOS tube 14 is used to calculate the IBIASThe current is mirrored to the second MOS tube 12, the third MOS tube 13 and the fourth MOS tube 14 to respectively obtain K1*IBIAS、K2*IBIAS、K3*IBIASA reference value of the piecewise linear current;
the operational amplifier OTA1 converts the linearly changing V through the differential pair input relationship of the fifth MOS transistor 21 and the sixth MOS transistor 22slopeThe voltage is compared with the first voltage V1 to obtain a first continuous linear current I1, which is output to the twelfth MOS transistor 32 of the linear current adder unit IMUX.
The operational amplifier OTA2 will change V linearly through the differential pair input relationship of the seventh MOS transistor 23 and the eighth MOS transistor 24slopeThe voltage is compared with the second voltage V2 to obtain a second continuous linear current I2, which is output to the twelfth MOS transistor 32 of the linear current adder unit IMUX.
The operational amplifier OTA3 will change V linearly through the differential pair input relationship of the ninth MOS tube 25 and the tenth MOS tube 26slopeThe voltage is compared with the third voltage V3 to obtain a third continuous linear current I3, which is output to the twelfth MOS transistor 32 of the linear current adder unit IMUX.
The linear current adder unit IMUX adds and combines the three linear currents I1, I2 and I3, and the combined current passes through a tenth unitCompleting the two MOS tubes 32, collecting the residual reference current value by the eleventh MOS tube 31, finally, mirroring the current of the twelfth MOS tube 32 by the thirteenth MOS tube 33, and outputting the final segmented linear current I from the drainslope
The working principle is as follows:
the width-length ratios of three pairs of MOS tubes are designed to be different, and the piecewise linear ramp function is generated by utilizing the adjustment effect of the W/L pair on the transmission characteristic of the differential pair. The tail currents of the three pairs of operational amplifiers are respectively K1*IBIAS、K2*IBIAS、K3*IBIAS. For convenience of description, three pairs of operational amplifiers are named as a first operational amplifier OTA1, a second operational amplifier OTA2 and a third operational amplifier OTA3, respectively, and the channel width and length of the differential pair MOS thereof are: (W/L)21,22、(W/L)23,24、(W/L)25,26The gains of the three are gm1, gm2 and gm 3:
Figure BDA0002800065460000091
Figure BDA0002800065460000092
Figure BDA0002800065460000093
suppose we design three pairs of differential pairs of op-amps with the following relationship:
(W/L)21,22、(W/L)23,24、(W/L)25,261: 4: 16, then, the first and second electrodes,
gm1:gm2:gm3=1:2:4
the specific working process is as follows: when V isslope<<At V3, I1, I2 and I3 are almost zero, and the generated ramp current is also zero. With VslopeGradually increasing to near V1, OTA1 with the smallest gain first enters the linear region, outputting current:
Islope=I1=gm1(Vslope-V1)
when V isslopeContinuing to rise to near V2, gain-centered OTA2 also enters the linear region, beginning to output current, at which time:
Islope=I1+I2=gm1(Vslope-V1)+gm2(Vslope-V2)
when V isslopeFurther up to near the V3 voltage, OTA3 also enters the linear region:
Islope=I1+I2+I3=gm1(Vslope-V1)+gm2(Vslope-V2)+gm3(Vslope-V3)
the maximum slope compensation current that can be generated finally is K1*IBIAS+K2*IBIAS+K3*IBIAS
The actual current slope is:
Figure BDA0002800065460000094
wherein A is the proportion of the proportional current mirror, VslopeFor a fixed rising slope of the voltage, IchargeFor charging current, C is the capacitance, as shown in FIG. 3, the slope voltage VslopeSeries charging current IchargeAnd one end of the capacitor C is grounded, and different charging currents and capacitance values can be set according to circuit requirements to obtain the required slope.
According to the calculation results, different piecewise linear currents can be obtained by setting the gm value of different operational amplifiers (namely OTAs) and the number of different operational amplifiers (namely OTAs), wherein the gm and the V of each operational amplifier (namely OTA)slopeDetermines the slope of each segment. The voltage values of the first voltage V1, the second voltage V2 and the third voltage V3 also determine the time points t1, t2 and t3 of the slope turning point.
According to the control circuit of the continuous piecewise linear current, the output current of the reference current source module is controlled according to the comparison slope voltage and the multi-path preset voltage by the operational amplifier module, and then the multi-path output current is added and combined by the current adder module to obtain the continuous piecewise linear current, so that the current piecewise point and the piecewise slope can be flexibly set according to the number and the voltage of different operational amplifiers in the operational amplifier module, the universality is strong, and the control circuit can be used for any functional module needing slope control.
Example 2
The embodiment 2 of the present invention provides a control method of a control circuit using the continuous piecewise linear current, including the following steps:
s1, generating a plurality of paths of currents with different sizes by the reference current source module;
s2, the operational amplifier module controls the output current of the reference current source module in the S1 according to the comparison slope voltage and the multi-path preset voltage;
and S3, adding and combining the multi-path output current in the S2 by the current adder module to obtain continuous piecewise linear current.
Thus, the reference current source module of the reference multi-path firstly provides reference values of the piecewise linear current, which are respectively K1*IBIAS、K2*IBIAS、K3*IBIASComparison V by operational amplifier OTA1slopeVoltage and first voltage V1 for controlling K1*IBIASThe current is linearly adjusted, and a first linear current I1 is obtained through output; comparison V by operational Amplifier OTA2slopeVoltage and second voltage V2 for controlling K2*IBIASThe current is linearly adjusted, and a second linear current I2 is obtained through output; comparison V by operational Amplifier OTA3slopeVoltage and third voltage V3 for controlling K3*IBIASThe current is linearly adjusted, and a third linear current I3 is obtained through output; a linear current adder module IMUX for combining said first I1, second I2 and third I3 linear current together to generate IslopeAnd outputting the current.
According to the control method of the control circuit of the continuous piecewise linear current, the output current of the reference current source module is controlled by the operational amplifier module according to the comparison slope voltage and the multi-path preset voltage, and then the multi-path output current is added and combined by the current adder module to obtain the continuous piecewise linear current, so that the current piecewise point and the piecewise slope can be flexibly set according to the number and the voltage of different operational amplifiers in the operational amplifier module, the universality is high, and the control method can be used for any functional module needing slope control.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. The control circuit of the continuous piecewise linear current is characterized by comprising a reference current source module (1), an operational amplifier module (2) and a current adder module (3), wherein the reference current source module (1) and the current adder module (3) are used for generating a plurality of paths of currents with different sizes, the operational amplifier module (2) is electrically connected with the reference current source module (1), the operational amplifier module (2) controls the size of the output current of the reference current source module (1) according to the comparison slope voltage and the preset voltage of the plurality of paths, and then the output currents of the plurality of paths are added and combined through the current adder module (3) to obtain the continuous piecewise linear current.
2. The continuous piecewise linear current control circuit according to claim 1, characterized in that said operational amplifier module (2) comprises a first operational amplifier module OTA1, a second operational amplifier module OTA2 and a third operational amplifier module OTA3, said first operational amplifier module OTA1, second operational amplifier module OTA2 and third operational amplifier module OTA3 being connected to said reference current source module (1) and to said current adder module (3).
3. The continuous piecewise linear current control circuit according to claim 2, wherein the reference current source module (1) comprises a first MOS transistor (11), a second MOS transistor (12), a third MOS transistor (13), a fourth MOS transistor (14) and a reference current source IBIASThe reference current source IBIASThe grid of the first MOS tube (11) is connected with the drain of the first MOS tube (11) in parallel, the grid of the second MOS tube (12), the grid of the third MOS tube (13) and the grid of the fourth MOS tube (14), and the source of the first MOS tube (11), the source of the second MOS tube (12), the source of the third MOS tube (13) and the source of the fourth MOS tube (14) are all connected with the power supply.
4. The continuous segmented linear current control circuit according to claim 3, wherein the first operational amplifier module OTA1 comprises a fifth MOS transistor (21) and a sixth MOS transistor (22), the second operational amplifier module OTA2 comprises a seventh MOS transistor (23) and an eighth MOS transistor (24), the third operational amplifier module OTA3 comprises a ninth MOS transistor (25) and a tenth MOS transistor (26), the source of the fifth MOS transistor (21) and the source of the sixth MOS transistor (22) are both connected to the drain of the second MOS transistor (12), the source of the seventh MOS transistor (23) and the source of the eighth MOS transistor (24) are both connected to the drain of the third MOS transistor (13), the source of the ninth MOS transistor (25) and the source of the tenth MOS transistor (26) are both connected to the drain of the fourth MOS transistor (14), the gate of the sixth MOS transistor (22) is connected to the first voltage V1, and the gate of the eighth MOS transistor (24) is connected to the second voltage V2, the grid electrode of the tenth MOS tube (26) is connected with a third voltage V3, and the grid electrode of the fifth MOS tube (21), the grid electrode of the seventh MOS tube (23) and the grid electrode of the ninth MOS tube (25) are connected with a slope voltage Vslope
5. The continuous piecewise linear current control circuit according to claim 4, wherein the current adder module (3) comprises an eleventh MOS transistor (31), a twelfth MOS transistor (32) and a thirteenth MOS transistor (33), and the drain of the fifth MOS transistor (21), the drain of the seventh MOS transistor (23) and the drain of the ninth MOS transistor (25) are the eleventh MOS transistor (3)31) The drain electrode of the sixth MOS tube (22), the drain electrode of the eighth MOS tube (24) and the drain electrode of the tenth MOS tube (26) are all connected with the drain electrode of the twelfth MOS tube (32), the gate electrode of the twelfth MOS tube (32) and the gate electrode of the thirteenth MOS tube (33), the source electrode of the eleventh MOS tube (31), the source electrode of the twelfth MOS tube (32) and the source electrode of the thirteenth MOS tube (33) are all grounded, and the drain electrode of the thirteenth MOS tube (33) outputs a continuous segmented linear current Islope
6. The continuous piecewise linear current control circuit according to any one of claims 3 to 5, wherein the first MOS transistor (11), the second MOS transistor (12), the third MOS transistor (13), and the fourth MOS transistor (14) are all PMOS transistors.
7. The continuous segmented linear current control circuit according to claim 6, wherein the fifth MOS transistor (21), the sixth MOS transistor (22), the seventh MOS transistor (23), the eighth MOS transistor (24), the ninth MOS transistor (25) and the tenth MOS transistor (26) are all PMOS transistors.
8. The control circuit of continuous piecewise linear current according to claim 7, wherein said eleventh MOS transistor (31), twelfth MOS transistor (32) and thirteenth MOS transistor (33) are all NMOS transistors.
9. The continuous piecewise linear current control circuit of claim 4, wherein said first voltage V1 has a voltage value less than a voltage value of a second voltage V2, and said second voltage V2 has a voltage value less than a voltage value of a third voltage V3.
10. A control method of a control circuit applying a continuous piecewise linear current according to any one of claims 1 to 9, comprising the steps of:
s1, generating a plurality of paths of currents with different sizes by the reference current source module;
s2, the operational amplifier module controls the output current of the reference current source module in the S1 according to the comparison slope voltage and the multi-path preset voltage;
and S3, adding and combining the multi-path output current in the S2 by the current adder module to obtain continuous piecewise linear current.
CN202011346397.1A 2020-11-26 2020-11-26 Control circuit and control method for continuous piecewise linear current Pending CN112631366A (en)

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