CN102931832B - PWM (pulse width modulation) type adjustable RC (resistance-capacitance) circuit and adjustment method thereof - Google Patents
PWM (pulse width modulation) type adjustable RC (resistance-capacitance) circuit and adjustment method thereof Download PDFInfo
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- CN102931832B CN102931832B CN201210486281.7A CN201210486281A CN102931832B CN 102931832 B CN102931832 B CN 102931832B CN 201210486281 A CN201210486281 A CN 201210486281A CN 102931832 B CN102931832 B CN 102931832B
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Abstract
The invention discloses a PWM (pulse width modulation) type adjustable RC (resistance-capacitance) circuit and an adjustment method thereof. The PWM type adjustable RC circuit comprises a first-order RC circuit, an electronic switch, a PWM controller and a voltage-maintaining afterflow loop, wherein the electronic switch controls the switching on or switching off of a capacitor in the first-order RC circuit; and the voltage-maintaining afterflow loop controls the voltage at both ends of the capacitor in the first-order RC circuit, and ensures that the current in the circuit and the voltage at both ends of the capacitor are kept unchanged when the capacitor is not switched on in the circuit. The PWM type adjustable RC circuit designed by the invention is based on a PWM control technology, the control of the intermittent charging/discharging work states equivalently realizes the adjustment of the RC of the circuit, and the designed voltage-maintaining afterflow loop realizes that the voltage and current in the circuit are continuously and smoothly changed in the switching process of the switch.
Description
Technical field
The present invention relates to a kind of adjustable resistance-capacitance circuit, particularly the adjustable resistance-capacitance circuit of a kind of pulse-width modulation (PWM) type, also relates to the control method of this circuit simultaneously.
Background technology
Control capacittance method the most frequently used at present that circuit capacitance-resistance is adjustable is that the physical characteristic by changing electric capacity realizes, but the capacitance adjustment that the method realizes, often there is very strong specific aim, and adjustable extent is very little, not there is the versatility to capacitance adjustment.In addition, some scholars are also in the method for other control capacittance of research, as Harbin University of Science and Technology Zhu Dongbai, Liu Ji etc. in current reactive power compensator during grouping switching capacitor electric capacity have differential and compensate a fairly large number of problem of required Capacitor banks, based on PWM control principle, the switching of two group capacitors is controlled with electronic power switch, by the duty ratio of regulable control pulse, control the operating time of two group capacitors, the electric capacity being equivalent to input coefficient is adjustable.But the program exists electric current in switching over momentary capacitance both end voltage and circuit to be had to suddenly change and produces, and can not realize adjustment process and steadily carry out.In addition the adjustment of single order PWM-type load by regulating the resistance in First-order Rc Circuit to realize capacitance-resistance also having author once to study, the harmonic wave that the adjustment process of this mode occurs can be larger, and stationarity is bad.
Summary of the invention
Given this, in order to solve the problem, the invention provides the adjustable resistance-capacitance circuit of a kind of PWM-type and control method thereof, ensure that voltage in switching over Process circuitry, electric current is continuous and stable change.
For realizing described object, the adjustable resistance-capacitance circuit of PWM-type of the present invention's design, comprises First-order Rc Circuit, electronic switch, PWM controller and pressurize continuous current circuit; Described PWM controller produces the work that PWM-type square-wave signal controls electronic switch, and described electronic switch controls access or the disconnection of electric capacity in First-order Rc Circuit; Described pressurize continuous current circuit controls electric capacity both end voltage in First-order Rc Circuit, and when ensureing that electric capacity is in not place in circuit, the voltage at the electric current in circuit and electric capacity two ends is constant.
Further, described pressurize continuous current circuit is a kind of input high impedance, and export Low ESR, multiplication factor approximates the circuit of 1.
As the first technical scheme of the present invention, described pressurize continuous current circuit comprises the first triode T1, the second triode T2, the first diode D1, the second diode D2, the second resistance R2 and the 3rd resistance R3.The collector electrode of the first triode T1 is connected with the positive pole of the first diode D1, the negative pole of the first diode D1 is connected to electric capacity C end points 4, the collector electrode of the second triode T2 is connected with the negative pole of the second diode D2, and the positive pole of the second diode D2 is connected to electric capacity C end points 4.First triode T1 base stage is connected to end points 3, the second triode T2 of electric capacity C base stage by the second resistance R2 is connected to electric capacity C end points 3 by the 3rd resistance R3.The emitter of the first triode T1 and the emitter of the second triode T2 are connected to electronic switch.
Further, the input and output electric current of described pressurize continuous current circuit is equal.
Further, described triode adopts emitter follower structure.
As the second technical scheme of the present invention, described pressurize continuous current circuit comprises the 3rd triode T3, the 4th triode T4, the 3rd diode D3, the 4th diode D4, the 6th resistance R6 the 7th resistance R7 and operational amplifier A.The collector electrode of described 3rd triode T3 is connected with the positive pole of the 3rd diode D3, and the negative pole of the 3rd diode D3 is connected to electric capacity C end points 4; The collector electrode of the 3rd triode T4 is connected with the negative pole of the 4th diode D4, and the positive pole of the 4th diode D4 is connected to electric capacity C with end points 4.3rd triode T3 base stage is connected to the output of operational amplifier A by the 6th resistance R6, the base stage of the 4th triode T4 is connected to the output of operational amplifier A by the 7th resistance R7, the positive input of operational amplifier A is connected to the end points 3 of electric capacity C, and the reverse input end of operational amplifier A is connected with output.
Further, described triode adopts emitter follower structure.
The control method of PWM-type is adjustable resistance-capacitance circuit, is characterized in that: comprise the following steps:
The first step: when electric capacity in First-order Rc Circuit connected by electronic switch, electric capacity C is in and fills or discharge condition;
Second step: when electronic switch disconnects electric capacity in First-order Rc Circuit, the voltage at pressurize freewheeling circuit holding capacitor C two ends is constant, in holding circuit, electric current is constant simultaneously;
3rd step: repeat the first step, second step.
Further, in described second step, the voltage at electric capacity C two ends is cycles that the square-wave signal produced by PWM controller controls electronic switch
and duty ratio
carry out the discharge and recharge time of control capacitance, equivalence changes the time constant of First-order Rc Circuit, thus realizes the adjustment to circuit capacitance-resistance, and
, duty ratio is less, then the time constant of equivalent First-order Rc Circuit is larger.
The present invention has the following advantages:
1, the adjustable resistance-capacitance circuit of pulse-width modulation (PWM) type of the present invention's design, comprises First-order Rc Circuit, electronic switch, PWM controller, pressurize continuous current circuit; Described electronic switch controls access or the disconnection of electric capacity in First-order Rc Circuit; Described pressurize continuous current circuit controls electric capacity both end voltage in First-order Rc Circuit, and when ensureing that electric capacity is in not place in circuit, the voltage at the electric current in circuit and electric capacity two ends is constant.Described PWM controller produces the work that PWM-type square-wave signal controls electronic switch, by the ON time of adjusting pulsewidth Duty ratio control electronic switch, thus the equivalence of control capacitance charge/discharge rates realizes the adjustment of capacitance-resistance, described pressurize continuous current circuit control capacitance interval charge/discharge operation state is equivalent to the adjustment of the change realizing circuit capacitance-resistance of capacitance.This PWM-type is adjustable, and resistance-capacitance circuit adjustable extent is large, has the versatility to capacitance adjustment;
2, the pressurize continuous current circuit of the present invention's design achieves voltage in switching over Process circuitry, electric current is continuous and stable change.
Accompanying drawing explanation
In order to make object of the present invention, technical scheme and beneficial effect clearly, the invention provides following accompanying drawing and being described:
Fig. 1 is the fundamental diagram of the adjustable resistance-capacitance circuit of PWM-type of the present invention;
PWM-type adjustable resistance-capacitance circuit embodiment one circuit diagram that Fig. 2 provides for the embodiment of the present invention;
PWM-type adjustable resistance-capacitance circuit embodiment two circuit diagram that Fig. 3 provides for the embodiment of the present invention;
The PWM-type adjustable resistance-capacitance circuit embodiment three-circuit figure that Fig. 4 provides for the embodiment of the present invention;
PWM-type adjustable resistance-capacitance circuit embodiment four circuit diagram that Fig. 5 provides for the embodiment of the present invention;
PWM-type adjustable resistance-capacitance circuit embodiment five circuit diagram that Fig. 6 provides for the embodiment of the present invention;
PWM-type adjustable resistance-capacitance circuit embodiment six circuit diagram that Fig. 7 provides for the embodiment of the present invention;
PWM-type adjustable resistance-capacitance circuit embodiment seven circuit diagram that Fig. 8 provides for the embodiment of the present invention;
Fig. 9 is circuit voltage step response curve schematic diagram of the present invention;
Figure 10 is circuital current step response curve of the present invention
The voltage step response curve schematic diagram of circuit when Figure 11 is different duty of the present invention.
Embodiment
Hereinafter with reference to accompanying drawing, embodiments of the invention are described in detail.Should be appreciated that embodiment only in order to the present invention is described, instead of in order to limit the scope of the invention.
PWM-type designed by the present invention is adjustable resistance-capacitance circuit, comprises First-order Rc Circuit, PWM controller, electronic switch and pressurize continuous current circuit.Described PWM controller produces the work that PWM-type square-wave signal controls electronic switch, and described electronic switch controls access or the disconnection of electric capacity in First-order Rc Circuit; Described pressurize continuous current circuit controls electric capacity both end voltage in First-order Rc Circuit, and when ensureing that electric capacity is in not place in circuit, the voltage at the electric current in circuit and electric capacity two ends is constant.Described pressurize continuous current circuit is a kind of input high impedance (resistance is less than 2M Ω and is greater than 1M Ω), and export Low ESR (being less than 40 Ω), multiplication factor approximates the circuit of 1.
The present invention can design the adjustable resistance-capacitance circuit of a kind of PWM-type by circuit diagram 2.As the first embodiment of the present invention, described pressurize continuous current circuit comprises the triode (the first triode T1 and the second triode T2) of both direction, the diode (the first diode D1 and the second diode D2) of both direction and two resistance (the second resistance R2 and the 3rd resistance R3), and described triode adopts emitter follower structure.The collector electrode of described first triode T1 is connected with the positive pole of the first diode D1, the negative pole of the first diode D1 is connected to electric capacity C end points 4, the collector electrode of the second triode T2 is connected with the negative pole of the second diode D2, and the positive pole of the second diode D2 is connected to electric capacity C end points 4.First triode T1 base stage is connected to end points 3, the second triode T2 of electric capacity C base stage by the second resistance R2 is connected to electric capacity C end points 3 by the 3rd resistance R3.The emitter of the first triode T1 and the emitter of the second triode T2 are connected to electronic switch.When electronic switch connects 1, electric capacity C is in and fills or discharge condition; When switching over connects 2, electric current is flowed by pressurize continuous current circuit.Consider positive/negative voltage signal, so be configured with triode T1, T2 of both direction, diode D1, D2 in circuit have protected in freewheeling circuit only has a triode operation in the same time.When electronic switch is switched to 2 from 1, keep the voltage U of emitter
owith electric capacity both end voltage U
csubstantially identical, resistance powers on to be pressed in before and after switching over and remains unchanged, so the current i flowing through the first resistance R1 remains unchanged, ensure that voltage in switching over Process circuitry, electric current is continuous and stable change.
The present invention can also design the adjustable resistance-capacitance circuit of a kind of PWM-type according to Fig. 3.As the second embodiment of the present invention, described pressurize continuous current circuit comprises triode (the first triode T1 and the second triode T2) and two resistance (the second resistance R2 and the 3rd resistance R3) of both direction, and described triode adopts emitter follower structure.The collector electrode of described first triode T1 is connected to electric capacity C end points 4; Electric capacity C end points 4 received by the collector electrode of the second triode T2.First triode T1 base stage is connected to end points 3, the second triode T2 of electric capacity C base stage by the second resistance R2 is connected to electric capacity C end points 3 by the 3rd resistance R3.The emitter of the first triode T1 and the emitter of the second triode T2 are connected to electronic switch.When electronic switch connects 1, electric capacity C is in and fills or discharge condition; When switching over connects 2, electric current is flowed by pressurize continuous current circuit.Consider positive/negative voltage signal, so be configured with triode T3, T4 of both direction.When electronic switch is switched to 2 from 1, keep the voltage U of emitter
owith electric capacity both end voltage U
csubstantially identical, resistance powers on to be pressed in before and after switching over and remains unchanged, so the current i flowing through the first resistance R1 remains unchanged, ensure that voltage in switching over Process circuitry, electric current is continuous and stable change.
The present invention can also design the adjustable resistance-capacitance circuit of a kind of PWM-type according to Fig. 4.Comprise triode (the first triode T1 and the second triode T2) and four resistance (the second resistance R2, the 3rd resistance R3, the 4th resistance R4 and the 5th resistance R5) of both direction as pressurize continuous current circuit described in the third embodiment of the present invention, described triode adopts emitter follower structure.The collector electrode that the collector electrode of described first triode T1 is connected to electric capacity C end points 4, second triode T2 by the 4th resistance R4 is connected to electric capacity C end points 4 by the 5th resistance R5.First triode T1 base stage is connected to end points 3, the second triode T2 of electric capacity C base stage by the second resistance R2 is connected to electric capacity C end points 3 by the 3rd resistance R3.The emitter of the first triode T1 and the emitter of the second triode T2 are connected to electronic switch.When electronic switch connects 1, electric capacity C is in and fills or discharge condition; When switching over connects 2, electric current is flowed by pressurize continuous current circuit.Consider positive/negative voltage signal, so be configured with triode T1, T2 of both direction.When electronic switch is switched to 2 from 1, keep the voltage U of emitter
owith electric capacity both end voltage U
csubstantially identical, resistance powers on to be pressed in before and after switching over and remains unchanged, so the current i flowing through the first resistance R1 remains unchanged, ensure that voltage in switching over Process circuitry, electric current is continuous and stable change.
The present invention also can design the adjustable resistance-capacitance circuit of a kind of PWM-type according to Fig. 5.As the fourth embodiment of the present invention, described pressurize continuous current circuit comprises the triode (the 3rd triode T3 and the 3rd triode T4) of both direction, the diode (the 3rd diode D3 and the 4th diode D4) of both direction, two resistance (the 6th resistance R6 and the 7th resistance R7) and an operational amplifier A, and described triode adopts emitter follower structure.The collector electrode of described 3rd triode T3 is connected with the positive pole of the 3rd diode D3, and the negative pole of the 3rd diode D3 is connected to electric capacity C end points 4; The collector electrode of the 3rd triode T4 is connected with the negative pole of the 4th diode D4, and the positive pole of the 4th diode D4 is connected to electric capacity C end points 4.3rd triode T3 base stage is connected to the output of operational amplifier A by the 6th resistance R6, the base stage of the 4th triode T4 is connected to the output of operational amplifier A by the 7th resistance R7, the positive input of operational amplifier A is connected to the end points 3 of electric capacity C, and the reverse input end of operational amplifier A is connected with output.The emitter of the 3rd triode T3 and the emitter of the 4th triode T4 are connected to electronic switch.When electronic switch connects 1, electric capacity C is in and fills or discharge condition; When switching over connects 2, electric current is flowed by pressurize continuous current circuit.Consider positive/negative voltage signal, so be configured with triode T3, T4 of both direction, diode D3, D4 in circuit ensure that in freewheeling circuit to only have a triode operation in the same time.When electronic switch is switched to 2 from 1, keep the voltage U of emitter
owith electric capacity both end voltage U
csubstantially identical, resistance powers on to be pressed in before and after switching over and remains unchanged, so the current i flowing through the first resistance R1 remains unchanged, ensure that voltage in switching over Process circuitry, electric current is continuous and stable change.
The present invention can also design the adjustable resistance-capacitance circuit of a kind of PWM-type according to Fig. 6.As the fifth embodiment of the present invention, described pressurize continuous current circuit comprises the triode (the 3rd triode T3 and the 3rd triode T4) of both direction, the diode (the 3rd diode D3 and the 4th diode D4) of both direction, two resistance (the 8th resistance R8 and the 9th resistance R9) and an operational amplifier A, and described triode adopts emitter follower structure.The collector electrode of described 3rd triode T3 is connected with the positive pole of the 3rd diode D3, and the negative pole of the 3rd diode D3 is connected to electric capacity C end points 4; The collector electrode of the 4th triode T4 is connected with the negative pole of the 4th diode D4, and the positive pole of the 4th diode D4 is connected to electric capacity C end points 4.3rd triode T3 base stage is connected to the output of operational amplifier A, the base stage of the 4th triode T4 is connected to the output of operational amplifier A, the positive input of operational amplifier A is connected to the end points 3 of electric capacity C by the 8th resistance R8, the reverse input end of operational amplifier A is connected with output by the 9th resistance R9.The emitter of the 3rd triode T3 and the emitter of the 4th triode T4 are connected to electronic switch.When electronic switch connects 1, electric capacity C is in and fills or discharge condition; When switching over connects 2, electric current is flowed by pressurize continuous current circuit.Consider positive/negative voltage signal, so be configured with triode T3, T4 of both direction, diode D3, D4 in circuit ensure that in freewheeling circuit to only have a triode operation in the same time.When electronic switch is switched to 2 from 1, keep the voltage U of emitter
owith electric capacity both end voltage U
csubstantially identical, resistance powers on to be pressed in before and after switching over and remains unchanged, so the current i flowing through the first resistance R1 remains unchanged, ensure that voltage in switching over Process circuitry, electric current is continuous and stable change.
The present invention can also design the adjustable resistance-capacitance circuit of a kind of PWM-type according to Fig. 7.As the sixth embodiment of the present invention, described pressurize continuous current circuit comprises the triode (the 3rd triode T3 and the 3rd triode T4) of both direction, the triode (the 3rd triode T3 and the 3rd triode T4) of both direction and an operational amplifier A, and described triode adopts emitter follower structure.The collector electrode of the 3rd triode T3 is connected with the positive pole of the 3rd diode D3, and the negative pole of the 3rd diode D3 is connected to electric capacity C end points 4; The collector electrode of the 4th triode T4 is connected with the negative pole of the 4th diode D4, and the positive pole of the 4th diode D4 is connected to electric capacity C end points 4.3rd triode T3 base stage is connected to the output of operational amplifier A, the base stage of the 4th triode T4 is connected to the output of operational amplifier A, the positive input of operational amplifier A is connected to the end points 3 of electric capacity C, and the reverse input end of operational amplifier A is connected with output.The emitter of the 3rd triode T3 and the emitter of the 4th triode T4 are connected to electronic switch.When electronic switch connects 1, electric capacity C is in and fills or discharge condition; When switching over connects 2, electric current is flowed by pressurize continuous current circuit.Consider positive/negative voltage signal, so be configured with triode T3, T4 of both direction, diode D3, D4 in circuit ensure that in freewheeling circuit to only have a triode operation in the same time.When electronic switch is switched to 2 from 1, keep the voltage U of emitter
owith electric capacity both end voltage U
csubstantially identical, resistance powers on to be pressed in before and after switching over and remains unchanged, so the current i flowing through the first resistance R1 remains unchanged, ensure that voltage in switching over Process circuitry, electric current is continuous and stable change.
The present invention can also design the adjustable resistance-capacitance circuit of a kind of PWM-type according to Fig. 8.As the seventh embodiment of the present invention, described pressurize continuous current circuit comprises the triode (the 3rd triode T3 and the 3rd triode T4) of both direction, two resistance (the 8th resistance R8 and the 9th resistance R9) and an operational amplifier A, and described triode adopts emitter follower structure.The collector electrode of described 3rd triode T3 is connected to electric capacity C end points 4; The collector electrode of the 4th triode T4 is connected to electric capacity C end points 4.3rd triode T3 base stage is connected to the output of operational amplifier A, the base stage of the 4th triode T4 is connected to the output of operational amplifier A, the positive input of operational amplifier A is connected to the end points 3 of electric capacity C by the 8th resistance R8, the reverse input end of operational amplifier A is connected with output by the 9th resistance R9.The emitter of the 3rd triode T3 and the emitter of the 4th triode T4 are connected to electronic switch.When electronic switch connects 1, electric capacity C is in and fills or discharge condition; When switching over connects 2, electric current is flowed by pressurize continuous current circuit.Consider positive/negative voltage signal, so be configured with triode T3, T4 of both direction, when electronic switch is switched to 2 from 1, keep the voltage U of emitter
owith electric capacity both end voltage U
csubstantially identical, resistance powers on to be pressed in before and after switching over and remains unchanged, so the current i flowing through the first resistance R1 remains unchanged, ensure that voltage in switching over Process circuitry, electric current is continuous and stable change.
Based on above embodiment, the control method of PWM-type of the present invention is adjustable resistance-capacitance circuit, comprises the following steps:
The first step: when electric capacity in First-order Rc Circuit connected by electronic switch, electric capacity C is in and fills or discharge condition;
Second step: when electronic switch disconnects electric capacity in First-order Rc Circuit, the voltage at pressurize freewheeling circuit holding capacitor C two ends is constant, in holding circuit, electric current is constant simultaneously;
3rd step: repeat the first step, second step.
In described second step, the voltage at electric capacity C two ends is cycles that the square-wave signal produced by PWM controller controls electronic switch
and duty ratio
carry out the discharge and recharge time of control capacitance, equivalence changes the time constant of First-order Rc Circuit, thus realizes the adjustment to circuit capacitance-resistance, and
, duty ratio is less, then the time constant of equivalent First-order Rc Circuit is larger.
In Fig. 9,1. curve is switch voltage response curves when being always in 1 position in design circuit, and now the time constant of RC circuit is
, 2. curve is that electronic switch is according to the cycle
, duty ratio
voltage response curves during work, now the time constant of RC circuit is
.
In Figure 10
curve is the current step response curve of switch when being in connection 1,
curve is the current step response curve of switch when switching between 1,2.
In Figure 11,
curve is the voltage step response curve of δ=1 i.e. switch when being only in position 1, and 6. curve is
voltage step response curve when=0.5,7. curve is
when=0.1, voltage step response curve, visible
.
In summary, achieve the adjustment to circuit capacitance-resistance by pulse-width modulation, its adjustment process is that continuous and stable carries out.
What finally illustrate is, above preferred embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although by above preferred embodiment to invention has been detailed description, but those skilled in the art are to be understood that, various change can be made to it in the form and details, and not depart from claims of the present invention limited range.
Claims (4)
1. the adjustable resistance-capacitance circuit of PWM-type, is characterized in that: comprise First-order Rc Circuit, electronic switch, PWM controller and pressurize continuous current circuit; Described PWM controller produces the work that PWM-type square-wave signal controls electronic switch; Described electronic switch controls access or the disconnection of electric capacity in First-order Rc Circuit; Described pressurize continuous current circuit controls electric capacity both end voltage in First-order Rc Circuit, and when ensureing that electric capacity is in not place in circuit, the voltage at the electric current in circuit and electric capacity two ends is constant;
Described pressurize continuous current circuit comprises the first triode (T1), the second triode (T2), the first diode (D1), the second diode (D2), the second resistance (R2) and the 3rd resistance (R3), the collector electrode of described first triode (T1) and the positive pole of the first diode (D1), the negative pole of the first diode (D1) is connected to one end of electric capacity (C), the collector electrode of the second triode (T2) is connected with the negative pole of the second diode (D2), and the positive pole of the second diode (D2) is connected with the negative pole of the first diode; First triode (T1) base stage is connected to the other end of electric capacity (C) by the second resistance (R2), and the base stage of the second triode (T2) is connected to the common port of electric capacity and the second resistance by the 3rd resistance (R3); Or described pressurize continuous current circuit comprises the 3rd triode (T3), the 4th triode (T4), the 3rd diode (D3), the 4th diode (D4), the 6th resistance (R6), the 7th resistance (R7) and operational amplifier (A); The collector electrode of described 3rd triode (T3) is connected with the positive pole of the 3rd diode (D3), and the negative pole of the 3rd diode (D3) is connected to one end of electric capacity (C); The collector electrode of the 4th triode (T4) is connected with the negative pole of the 4th diode (D4), and the positive pole of the 4th diode (D4) is connected to the common port of electric capacity (C) and the 3rd diode (D3); 3rd triode (T3) base stage is connected to the output of operational amplifier (A) by the 6th resistance (R6), the base stage of the 4th triode (T4) is connected to the output of operational amplifier (A) by the 7th resistance (R7), the positive input of operational amplifier (A) is connected to the other end of electric capacity (C), and the reverse input end of operational amplifier (A) is connected with output; 3rd triode (T3) emitter is connected to electronic switch, and the 4th triode (T4) emitter is connected to electronic switch.
2. the adjustable resistance-capacitance circuit of PWM-type according to claim 1, is characterized in that: described pressurize continuous current circuit is a kind of input high impedance, and export Low ESR, multiplication factor approximates the circuit of 1.
3. the adjustable resistance-capacitance circuit of PWM-type according to claim 1, is characterized in that: the input and output electric current of described pressurize continuous current circuit is equal.
4. the adjustable resistance-capacitance circuit of PWM-type according to claim 1, is characterized in that: described triode adopts emitter follower structure.
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| CN201210486281.7A CN102931832B (en) | 2012-11-26 | 2012-11-26 | PWM (pulse width modulation) type adjustable RC (resistance-capacitance) circuit and adjustment method thereof |
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| CN107968568B (en) * | 2017-12-12 | 2024-03-12 | 清华四川能源互联网研究院 | Low-power consumption constant-on-time timing circuit design method and timing circuit |
| CN108398972B (en) * | 2018-05-15 | 2023-08-22 | 高玉琴 | Temperature controller based on silicon controlled rectifier |
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