CN114995567B - Slope compensation circuit of current control type - Google Patents
Slope compensation circuit of current control type Download PDFInfo
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- CN114995567B CN114995567B CN202210699468.9A CN202210699468A CN114995567B CN 114995567 B CN114995567 B CN 114995567B CN 202210699468 A CN202210699468 A CN 202210699468A CN 114995567 B CN114995567 B CN 114995567B
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- 238000005070 sampling Methods 0.000 claims abstract description 19
- 239000003990 capacitor Substances 0.000 claims description 22
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a current control type slope compensation circuit, and belongs to the field of power supply control. The RAMP end of the control chip is simultaneously connected with one end of a third resistor and one end of a fourth resistor, the CT end of the control chip is simultaneously connected with the other end of the third resistor and the B pole of an NPN triode, the Vref end of the control chip is connected with the C pole of the NPN triode, and the E pole of the NPN triode is simultaneously connected with the other end of the fourth resistor R4 and the current sampling signal Vi of the current sampling circuit; the current sampling signal Vi is input to the SD end of the control chip after passing through the overcurrent protection circuit. The invention adds a positive slope voltage on the current sampling signal Vi and then sends the voltage to the RAMP end of the control chip, so that the intersection point of the RAMP end and the output of the error amplifier in the PWM comparator is changed, the average current output by the inductor is irrelevant to the on time, and when the power supply is disturbed, the disturbance can be automatically eliminated after a plurality of periods.
Description
Technical Field
The invention belongs to the field of power supply control, and particularly relates to a current control type slope compensation circuit.
Background
When the power control mode adopts a peak current mode, when the duty ratio is more than 50%, interference is amplified, and even the power product oscillates. The existing common method is to superimpose a negative slope voltage on the output of the error amplifier, change the intersection point of the current sampling signal Vi and the output end of the error amplifier, so as to solve the problem of power supply oscillation caused by amplified interference, but the circuit is relatively complex to implement.
Disclosure of Invention
The present invention is directed to a slope compensation circuit for current control, which overcomes the above-mentioned drawbacks of the prior art.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
the slope compensation circuit comprises a control chip, wherein the RAMP end of the control chip is simultaneously connected with one end of a third resistor and one end of a fourth resistor, the CT end of the control chip is simultaneously connected with the other end of the third resistor and the B pole of an NPN triode, the Vref end of the control chip is connected with the C pole of the NPN triode, and the E pole of the NPN triode is simultaneously connected with the other end of the fourth resistor R4 and the current sampling signal Vi of the current sampling circuit; the current sampling signal Vi is input to the SD end of the control chip after passing through the overcurrent protection circuit.
Further, the current sampling circuit is composed of a transformer, a diode, a first capacitor, a first resistor and a seventh resistor;
one side of the output end of the transformer is connected with the positive electrode of a diode, the other side of the output end of the transformer is simultaneously connected with one end of a first capacitor and one end of a variable seventh resistor, the negative electrode of the diode is simultaneously connected with the other end of the first capacitor, the other end of the variable seventh resistor and one end of the first resistor, and the other end of the first resistor R1 is simultaneously connected with the E electrode of an NPN triode.
Further, the overcurrent protection circuit is composed of a fifth resistor, a sixth resistor and a second capacitor;
one end of the fifth resistor is simultaneously connected with the other end of the first resistor, the E pole of the NPN triode and the other end of the fourth resistor, and the other end of the fifth resistor R5 is simultaneously connected with the other end of the second capacitor, the other end of the sixth resistor and the SD end of the control chip;
the other end of the sixth resistor and the other end of the second capacitor are simultaneously connected with one end of the first capacitor and one end of the seventh resistor.
Further, the model of the control chip is a current mode control chip UC1843.
Further, the RAMP end of the control chip is simultaneously connected with one end of the third resistor and one end of the fourth resistor through the second resistor.
Further, the values of the third resistor and the fourth resistor are such that the voltage slope of the current sampling signal Vi is equal to half of the falling slope of the output inductor current.
Further, the voltage superimposed on the current sample signal Vi is
Wherein,,
to increase the slope of the voltage on Vi, V 0 Is C t Terminal voltage, t on For the on-time of each switching cycle.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a slope compensation circuit of current control type, which is characterized in that a positive slope voltage is superimposed on a current sampling signal Vi and then is sent to a control chip RAMP end, so that the intersection point of the RAMP end and the output of an error amplifier in a PWM comparator is changed, the average current output by an inductor is irrelevant to the conduction time, and after the power supply is disturbed, the disturbance can be automatically eliminated after a plurality of periods. The circuit has few used devices, simple structure and easy realization and large-scale popularization and application. The invention solves the oscillation problem of the power supply product when the duty ratio is more than 50% in the current control mode.
Drawings
Fig. 1 is a schematic diagram of a slope compensation circuit of the current control type of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the attached drawing figures:
the invention provides a current control type slope compensation circuit, which comprises a transformer T1, a diode D1, a first capacitor C1, a first resistor R1 and a seventh resistor Rx which form a current sampling circuit, wherein a third resistor R3, a fourth resistor R4, an NPN triode Q1 and a CT end of a control chip U1 form a slope compensation circuit, and a fifth resistor R5, a sixth resistor R6 and a second capacitor C2 form an overcurrent protection circuit.
Referring to fig. 1, fig. 1 is a circuit diagram of a current control type slope compensation circuit, wherein the current control type slope compensation circuit includes a transformer T1, a diode D1, a first capacitor C1, a first resistor R1, a seventh resistor Rx, a third resistor R3, a fourth resistor R4, an NPN triode Q1, a control chip U1, a fifth resistor R5, a sixth resistor R6, and a second capacitor C2; the input end of the transformer T1 is output current, one side of the output end of the transformer T1 is connected with the positive electrode of a diode D1, the other side of the output end of the transformer T1 is simultaneously connected with one end of a first capacitor C1, one end of a seventh resistor Rx, one end of a second capacitor C2 and one end of a sixth resistor R6, the negative electrode of the diode D1 is simultaneously connected with the other end of the first capacitor C1, the other end of the seventh resistor Rx and one end of the first resistor R1, the other end of the first resistor R1 is simultaneously connected with one end of a fifth resistor R5, one end of a fourth resistor R4 and the E electrode of an NPN triode Q1, and the other end of the fifth resistor R5 is simultaneously connected with the other end of the second capacitor C2, the other end of the sixth resistor R6 and the SD end of a control chip U1; the C pole of NPN triode Q1 is connected with the Vref end of control chip U1, and the CT end of control chip U1 connects one end of third resistance R3 and NPN triode Q1's B pole simultaneously, and the other end of third resistance R3 has connected the other end of fourth resistance R4 and one end of second resistance R2 simultaneously, and the other end of second resistance R2 holds with the RAMP of control chip U1.
The working mechanism of the slope compensation circuit of the current control type is as follows:
when the duty ratio is greater than 50%, the current disturbance at the output end can cause the output of the power supply product to oscillate, and the positive slope voltage is superposed on the current sampling signal Vi
Wherein dv is 0 The/dt is the slope of the voltage added to Vi to change the voltage waveform fed to RAMP. V (V) 0 Is C t Terminal voltage, t on For the on-time of each switching cycle. By selecting the values of the third resistor R3 and the fourth resistor R4 such that the voltage slope superimposed on the current sampling signal Vi is equal to half the output inductor current falling slope, the output inductor current average value is independent of the on-time. When the power supply is disturbed, the disturbance is reduced until the output is recovered to be normal after being regulated for a plurality of periods.
The above is only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited by this, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (3)
1. The slope compensation circuit is characterized by comprising a control chip U1, wherein the CT end of the control chip U1 is simultaneously connected with the other end of a third resistor R3 and the B pole of an NPN triode Q1, the Vref end of the control chip U1 is connected with the C pole of the NPN triode Q1, and the E pole of the NPN triode Q1 is simultaneously connected with the other end of a fourth resistor R4 and a current sampling signal Vi of a current sampling circuit; the current sampling signal Vi is input to the SD end of the control chip U1 after passing through the overcurrent protection circuit;
the model of the control chip U1 is a current type control chip UC1843;
the RAMP end of the control chip U1 is simultaneously connected with one end of a third resistor R3 and one end of a fourth resistor R4 through a second resistor R2;
the values of the third resistor R3 and the fourth resistor R4 are such that the voltage slope of the current sampling signal Vi is equal to half of the falling slope of the output inductance current;
the voltage superimposed on the current sample signal Vi is
Wherein,,
to increase the slope of the voltage on Vi, V 0 Is C t Terminal voltage, t on For the on-time of each switching cycle.
2. The current-controlled slope compensation circuit according to claim 1, wherein the current sampling circuit is composed of a transformer T1, a diode D1, a first capacitor C1, a first resistor R1 and a seventh resistor Rx;
one side of the output end of the transformer T1 is connected with the positive electrode of a diode D1, the other side of the output end of the transformer T1 is simultaneously connected with one end of a first capacitor C1 and one end of a variable seventh resistor Rx, the negative electrode of the diode D1 is simultaneously connected with the other end of the first capacitor C1, the other end of the variable seventh resistor Rx and one end of a first resistor R1, and the other end of the first resistor R1 is simultaneously connected with the E electrode of an NPN triode Q1.
3. The current-controlled slope compensation circuit according to claim 2, wherein the overcurrent protection circuit is composed of a fifth resistor R5, a sixth resistor R6, and a second capacitor C2;
one end of the fifth resistor R5 is simultaneously connected with the other end of the first resistor R1, the E pole of the NPN triode Q1 and the other end of the fourth resistor R4, and the other end of the fifth resistor R5 is simultaneously connected with the other end of the second capacitor C2, the other end of the sixth resistor R6 and the SD end of the control chip U1;
the other end of the sixth resistor R6 and the other end of the second capacitor C2 are simultaneously connected to one end of the first capacitor C1 and one end of the seventh resistor Rx.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210699468.9A CN114995567B (en) | 2022-06-20 | 2022-06-20 | Slope compensation circuit of current control type |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210699468.9A CN114995567B (en) | 2022-06-20 | 2022-06-20 | Slope compensation circuit of current control type |
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| CN114995567A CN114995567A (en) | 2022-09-02 |
| CN114995567B true CN114995567B (en) | 2023-07-07 |
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| US10587196B1 (en) * | 2019-02-22 | 2020-03-10 | Elite Semiconductor Memory Technology Inc. | Constant on-time controller and buck regulator device using the same |
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