CN213585136U - BUCK converter with overcurrent compensation - Google Patents
BUCK converter with overcurrent compensation Download PDFInfo
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- CN213585136U CN213585136U CN202022385024.7U CN202022385024U CN213585136U CN 213585136 U CN213585136 U CN 213585136U CN 202022385024 U CN202022385024 U CN 202022385024U CN 213585136 U CN213585136 U CN 213585136U
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Abstract
The utility model discloses a BUCK converter with overcurrent compensation, including control IC and slope compensation converting circuit, control IC's ISERSE foot with slope compensation converting circuit connects, still include the input with slope compensation converting circuit's current sampling signal output part connects, the output with the overcurrent compensation circuit that control IC's ISERSE foot is connected, overcurrent compensation circuit is used for working when current sampling signal output's electric current is greater than when predetermined threshold current, control IC stops exporting to balanced overcurrent protection value under the different input voltage conditions, simplified inductance and switching device's lectotype, reduced the product volume, improved its power density, improved the price/performance ratio of BUCK converter.
Description
Technical Field
The utility model relates to a manufacturing technical field of DC-DC (Direct current-Direct current converter, voltage converter) converter, concretely relates to BUCK (step-down converting circuit) converter with overcurrent compensation.
Background
For the peak type continuous mode control circuit, when its duty ratio is larger than 50%, subharmonic oscillation easily occurs. To avoid oscillations, the circuit introduces slope compensation. As shown in fig. 1, the compensation signal of the conventional slope compensation circuit is generally injected into the voltage feedback pin or the current detection pin, which may cause the deviation of the actual output voltage or current limit point after the slope compensation circuit is introduced. At present, a positive slope is commonly added to a current detection point, so that the normal output voltage is not influenced, and only a peak current limiting point is influenced. After slope compensation is added, the size of the duty ratio can directly influence the peak current limiting point, and under the condition of large duty ratio, the compensation voltage is large, so that the primary side current limiting point is reduced; under a small duty ratio, the compensation voltage is low, and the primary current limiting point is too high. Different current-limiting points have influence on the design and type selection of the magnetic core device and the power device, namely for a BUCK circuit with a duty ratio larger than 50%, after slope compensation is introduced to a current detection point, the difference of overcurrent protection points of a control chip is large under different input voltage conditions, and further the selection of the magnetic device and the power tube is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model provides a BUCK converter with overcurrent compensation for the current BUCK converter of solution introduce the slope compensation after, because of the too little technical problem of the selection scope of the great magnetic device that leads to of overcurrent protection point difference of control chip under different input voltage conditions and power tube.
In order to solve the technical problem, the utility model provides a technical scheme does:
a BUCK converter with overcurrent compensation comprises a control IC and a slope compensation conversion circuit, wherein an ISERSE pin (a current sampling detection pin) of the control IC is connected with the slope compensation conversion circuit, the BUCK converter also comprises an overcurrent compensation circuit, an input end of the overcurrent compensation circuit is connected with a current sampling signal output end of the slope compensation conversion circuit, an output end of the overcurrent compensation circuit is connected with the ISERSE pin of the control IC, and the overcurrent compensation circuit is used for controlling the control IC to stop outputting when the current of the current sampling signal output end is larger than a preset threshold current.
Preferably, the overcurrent compensation circuit includes: the first input end of the comparison circuit is connected with the current sampling signal output end of the slope compensation conversion circuit, the second input end of the comparison circuit is connected with the output end of the threshold current generation circuit, the output end of the comparison circuit is connected with the input end of the amplification circuit, and the output end of the amplification circuit is connected with an ISERSE pin of the control IC.
Preferably, the comparison circuit includes a first capacitor C1, a first resistor R1 and a comparator U1, a first end of the first resistor R1 is connected to the current sampling signal output end of the slope compensation conversion circuit, a second end of the first resistor R1 is connected to the positive input end of the comparator U1, a positive input end of the comparator U1 is further connected to the first end of the first capacitor C1, and the second end of the first capacitor C1 is grounded; the negative input of the comparator U1 is connected to the output of the threshold current generating circuit.
Preferably, the threshold current generating circuit includes a second resistor R2, a third resistor R3, and a second capacitor C2, a first end of the second resistor R2 is connected to the first reference voltage terminal, a second end of the second resistor R2 is connected to the negative input terminal of the second comparator U1, the third resistor R3 and the second capacitor C2 form a parallel circuit, a first end of the parallel circuit is grounded, and a second end of the parallel circuit is connected to the negative input terminal of the comparator U1.
Preferably, the amplifying circuit includes a fourth resistor R4, a fifth resistor R5, a first triode Q1 and a first diode D1, wherein a base of the first triode Q1 is connected to an output terminal of the comparator U1 and a first terminal of the fourth resistor R4, a second terminal of the fourth resistor R4 is connected to a collector of the first triode Q1, a collector of the first triode Q1 is further connected to the second reference voltage terminal, an emitter of the first triode Q1 is connected to an anode of the first diode D1, a cathode of the first diode D1 is connected to a first terminal of the fifth resistor R5, and a second terminal of the fifth resistor R5 is connected to an ISERSE pin of the control IC.
Preferably, the slope compensation conversion circuit includes a conversion circuit and a slope compensation circuit, and the slope compensation circuit is connected to the control IC and the conversion circuit, respectively.
Preferably, the slope compensation circuit includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a third capacitor C3, a fourth capacitor C4 and a second transistor Q2, a first end of the sixth resistor R6 is connected to a VREF pin of the control IC (a reference voltage output end of the control IC), a second end of the sixth resistor R6 is connected to an RT/CT pin of the control IC (a timekeeping end of the control IC, a common end of the sawtooth wave vibrator externally connected to the timekeeping capacitor C and the timekeeping resistor R), a first end of the third capacitor C3 and a base of the second transistor Q2, respectively, a second end of the third capacitor C3 is grounded, a collector of the second transistor Q2 is connected to the third reference voltage end, an emitter of the second transistor Q2 is connected to a first end of the seventh resistor R7, a second end of the seventh resistor R7 is connected to an isse pin of the control IC, a first end of the eighth resistor R8 and a first end of the fourth capacitor C4, the second terminal of the fourth capacitor C4 is grounded, and the second terminal of the eighth resistor R8 is connected to the first terminal of the first resistor R1 and the converting circuit, respectively.
Preferably, the inverter circuit includes a ninth resistor R9, a tenth resistor R10, a fifth capacitor C5, a second diode D2, a MOS transistor (Metal-Oxide-Semiconductor, fet), a conductance L, and a power supply, an anode of the power supply is connected to a drain of the MOS transistor, a source of the MOS transistor is connected to a cathode of the second diode D2 and a first end of the conductance L, a second end of the conductance L is connected to a first end of the fifth capacitor C5 and a first end of the ninth resistor R9, a second end of the fifth capacitor C5 and a second end of the ninth resistor R9 are both connected to an anode of the second diode D2, an anode of the second diode D2 is further connected to a first end of the tenth resistor R10, and a second end of the tenth resistor R10 is connected to a second end of the eighth resistor R8 and a cathode of the power supply.
The utility model discloses following beneficial effect has:
1. the utility model provides a BUCK converter with overcurrent compensation, current sampling signal output end through the slope compensation converting circuit who sets up in input and the BUCK converter in current BUCK converter is connected, the overcurrent compensation circuit that the ISERSE foot of the control IC in output and the BUCK converter is connected, when current sampling signal output end's electric current is greater than predetermined threshold current, stop output through overcurrent compensation circuit control IC, thereby the overcurrent protection value under the different input voltage condition has been balanced, the lectotype of inductance and switching device has been simplified, the product volume has been reduced, the power density thereof has been improved, the price/performance ratio of BUCK converter has been improved.
In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:
FIG. 1 is a prior art slope compensation circuit;
FIG. 2 is a BUCK converter with over-current compensation in a preferred embodiment of the present invention;
FIG. 3 shows the value of the inductance current during input protection of a conventional BUCK converter 400VIN without an over-current compensation circuit;
FIG. 4 shows values of inductance current during input protection of a conventional BUCK converter 700VIN without an over-current compensation circuit;
fig. 5 shows inductance current values at the time of input protection of BUCK converter 400VIN with over-current compensation in a preferred embodiment of the present invention;
fig. 6 shows values of inductance current at the time of input protection of BUCK converter 700VIN with overcurrent compensation according to a preferred embodiment of the present invention.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
The first embodiment is as follows:
the utility model discloses a BUCK converter with overcurrent compensation, including control IC and slope compensation converting circuit, control IC's ISERSE foot and slope compensation converting circuit are connected, still include that the input is connected with slope compensation converting circuit's current sampling signal output part, and the overcurrent compensation circuit that the output is connected with control IC's ISERSE foot overflows the compensating circuit, and overcurrent compensation circuit is used for when current sampling signal output's electric current is greater than predetermined threshold current, and control IC stops exporting.
The utility model provides a BUCK converter with overcurrent compensation, current sampling signal output end through the slope compensation converting circuit who sets up in input and the BUCK converter in current BUCK converter is connected, the overcurrent compensation circuit that the ISERSE foot of the control IC in output and the BUCK converter is connected, when current sampling signal output end's electric current is greater than predetermined threshold current, stop output through overcurrent compensation circuit control IC, thereby the overcurrent protection value under the different input voltage condition has been balanced, the lectotype of inductance and switching device has been simplified, the product volume has been reduced, the power density thereof has been improved, the price/performance ratio of BUCK converter has been improved.
Example two:
the second embodiment is an extended embodiment of the first embodiment, and is different from the first embodiment in that the structure and function of the BUCK converter with the over-current compensation are refined:
in the present embodiment, as shown in fig. 2, a BUCK converter with overcurrent compensation is disclosed, which includes a control IC, a slope compensation converting circuit, and an overcurrent compensation circuit.
Wherein, overcurrent compensation circuit includes: the first input end of the comparison circuit is connected with the current sampling signal output end of the slope compensation conversion circuit, the second input end of the comparison circuit is connected with the output end of the threshold current generation circuit, the output end of the comparison circuit is connected with the input end of the amplification circuit, and the output end of the amplification circuit is connected with an ISERSE pin of the control IC.
Specifically, the comparison circuit includes a first capacitor C1, a first resistor R1 and a comparator U1, a first end of the first resistor R1 is connected to a current sampling signal output end of the slope compensation conversion circuit, a second end of the first resistor R1 is connected to a positive input end of the comparator U1, a positive input end of the comparator U1 is further connected to a first end of the first capacitor C1, and a second end of the first capacitor C1 is grounded; the negative input of the comparator U1 is connected to the output of the threshold current generating circuit.
Specifically, the threshold current generating circuit comprises a second resistor R2, a third resistor R3 and a second capacitor C2, wherein a first end of the second resistor R2 is connected with the first reference voltage end, a second end of the second resistor R2 is connected with the negative input end of the second comparator U1, the third resistor R3 and the second capacitor C2 form a parallel circuit, a first end of the parallel circuit is grounded, and a second end of the parallel circuit is connected with the negative input end of the comparator U1.
Specifically, the amplifying circuit includes a fourth resistor R4, a fifth resistor R5, a first triode Q1 and a first diode D1, a base of the first triode Q1 is connected to an output terminal of the comparator U1 and a first end of the fourth resistor R4, a second end of the fourth resistor R4 is connected to a collector of the first triode Q1, a collector of the first triode Q1 is further connected to the second reference voltage terminal, an emitter of the first triode Q1 is connected to an anode of the first diode D1, a cathode of the first diode D1 is connected to a first end of the fifth resistor R5, and a second end of the fifth resistor R5 is connected to an ISERSE pin of the control IC.
The slope compensation conversion circuit comprises a conversion circuit and a slope compensation circuit, and specifically, the slope compensation circuit comprises a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a third capacitor C3, a fourth capacitor C4 and a second triode Q2, a first end of the sixth resistor R6 is connected with a VREF pin (a reference voltage output end of the control IC) of the control IC, a second end of the sixth resistor R6 is respectively connected with an RT/CT pin (a timekeeping end of the control IC, a common end of the external timekeeping capacitor C and the timekeeping resistor R of the saw-tooth wave vibrator), a first end of the third capacitor C3 and a base of the second triode Q2, a second end of the third capacitor C3 is grounded, a collector of the second triode Q2 is connected with a third reference voltage end, an emitter of the second triode Q2 is connected with a first end of the seventh resistor R7, and a second end of the seventh resistor R7 is respectively connected with an erse pin of the control IC, A first end of the eighth resistor R8 is connected to a first end of the fourth capacitor C4, a second end of the fourth capacitor C4 is grounded, and a second end of the eighth resistor R8 is connected to the first end of the first resistor R1 and the conversion circuit, respectively.
Specifically, the conversion circuit includes a ninth resistor R9, a tenth resistor R10, a fifth capacitor C5, a second diode D2, a MOS transistor (Metal-Oxide-Semiconductor, fet), a conductance L, and a power supply, wherein an anode of the power supply is connected to a drain of the MOS transistor, a source of the MOS transistor is connected to a cathode of the second diode D2 and a first end of the conductance L, a second end of the conductance L is connected to a first end of the fifth capacitor C5 and a first end of the ninth resistor R9, a second end of the fifth capacitor C5 and a second end of the ninth resistor R9 are both connected to an anode of the second diode D2, an anode of the second diode D2 is also connected to a first end of the tenth resistor R10, and a second end of the tenth resistor R10 is connected to a second end of the eighth resistor R8 and a cathode of the power supply.
In fig. 2, the first part is a conventional BUCK circuit with slope compensation, the slope compensation circuit is composed of Q1 and R5, the slope is generated by TR/CT pin of control IC, VREF is reference voltage generated by control IC, VCC is its supply voltage, ISENSE is current sampling detection pin, which collects peak current of BUCK converter.
When the BUCK converter with the overcurrent compensation starts to work, a TR/CT pin of a control IC generates a ramp current, the ramp current is amplified by a second triode Q2 and forms a ramp compensation signal through a seventh resistor R7, the ramp compensation signal is converged with a current sampling signal output by the conversion circuit, the current sampling signal is subjected to ramp compensation and is shunted to the overcurrent compensation circuit, and the shunted current sampling signal is input to the positive input end of the comparator U1 after passing through a first resistor R1 and a first capacitor C1; meanwhile, a first reference voltage of a first reference voltage terminal is input into the threshold current generating circuit, the first reference voltage is divided by a third resistor R3 and a fourth resistor R4, a second capacitor C2 filters the first reference voltage to generate a preset threshold current and input the preset threshold current into a negative input terminal of the comparator U1, the comparator U1 compares the current sampling signal with the threshold current supplied to the negative input terminal by the threshold current generating circuit, when the current sampling signal is greater than the threshold current, the comparator U1 outputs a high level to the base of the first triode Q1, so that the base of the first triode Q1 is at a high level, and further the emitter of the first triode Q1 also outputs a high level to the anode of the first diode D1, the anode of the first diode D1 is in a forward conduction, and the high level is input into an ISENSE pin of the control IC through a fifth resistor R5, eventually causing ISENSE to exceed the limit value, causing the control IC to stop outputting. When the current sampling signal disappears, the positive input end of the comparator U1 becomes low level, and the over-current compensation circuit is disabled. In the embodiment, the relative sizes of the third resistor R3 and the fourth resistor R4 can be set to limit different overcurrent protection points.
Fig. 3 shows the point of overcurrent protection tested at an input of about 400V without the overcurrent protection compensation control circuit, and it can be seen that protection occurs at a maximum inductor current of 7.1A. The channel 1 represents the ISENSE pin voltage of the control IC, the channel 2 represents the inductive current, the channel 3 represents the MOS tube driving signal, and the channel 4 represents the BUCK circuit input voltage.
Fig. 4 shows the point of overcurrent protection tested at an input of approximately 700V without the overcurrent protection compensation control circuit, and it can be seen that protection occurs at a maximum inductor current of 12.4A. The channel 1 represents the ISENSE pin voltage of the control IC, the channel 2 represents the inductive current, the channel 3 represents the MOS tube driving signal, and the channel 4 represents the BUCK circuit input voltage.
As can be seen from fig. 3 and 4, the inductor current protection value differs by 5.3A at different input voltages, which makes the inductor design and power tube selection difficult.
Fig. 5 and 6 show that after the overcurrent protection compensation circuit is added, protection can be performed at the same point at different input voltages, and the protection points are all 8.12A. As can be seen from the figure, the comparator U1 is at low level in normal operation, and becomes at high level when protection occurs. Channel 1 represents the output voltage of the control comparator U1, channel 2 represents the inductor current, channel 3 represents the MOS transistor drive signal, and channel 4 represents the BUCK circuit input voltage.
In conclusion, the utility model provides a BUCK converter with overcurrent compensation, current sampling signal output end through the slope compensation converting circuit who sets up input and BUCK converter in the current BUCK converter is connected, the overcurrent compensation circuit that the ISERSE foot of the control IC in output and the BUCK converter is connected, when current sampling signal output end's electric current is greater than predetermined threshold current, through overcurrent compensation circuit control IC stop output, thereby the overcurrent protection value under the different input voltage conditions has been balanced, the lectotype of inductance and switching device has been simplified, the product volume has been reduced, its power density has been improved, the price/performance ratio of BUCK converter has been improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The BUCK converter with the overcurrent compensation function comprises a control IC and a slope compensation conversion circuit, wherein an ISERSE pin of the control IC is connected with the slope compensation conversion circuit, and the BUCK converter is characterized by further comprising an overcurrent compensation circuit, wherein the input end of the overcurrent compensation circuit is connected with a current sampling signal output end of the slope compensation conversion circuit, the output end of the overcurrent compensation circuit is connected with the ISERSE pin of the control IC, and the overcurrent compensation circuit is used for controlling the control IC to stop outputting when the current of the current sampling signal output end is larger than a preset threshold current.
2. The BUCK converter with overcurrent compensation according to claim 1, wherein the overcurrent compensation circuit includes: the first input end of the comparison circuit is connected with the current sampling signal output end of the slope compensation conversion circuit, the second input end of the comparison circuit is connected with the output end of the threshold current generation circuit, the output end of the comparison circuit is connected with the input end of the amplification circuit, and the output end of the amplification circuit is connected with the ISERSE pin of the control IC.
3. The BUCK converter with overcurrent compensation according to claim 2, wherein the comparison circuit includes a first capacitor C1, a first resistor R1 and a comparator U1, a first end of the first resistor R1 is connected to the current sampling signal output end of the slope compensation conversion circuit, a second end of the first resistor R1 is connected to the positive input end of the comparator U1, the positive input end of the comparator U1 is further connected to the first end of the first capacitor C1, and the second end of the first capacitor C1 is grounded; the negative input terminal of the comparator U1 is connected with the output terminal of the threshold current generating circuit.
4. The BUCK converter with overcurrent compensation as recited in claim 3, wherein the threshold current generation circuit comprises a second resistor R2, a third resistor R3 and a second capacitor C2, a first end of the second resistor R2 is connected to a first reference voltage terminal, a second end of the second resistor R2 is connected to a negative input terminal of the second comparator U1, the third resistor R3 and the second capacitor C2 form a parallel circuit, a first end of the parallel circuit is grounded, and a second end of the parallel circuit is connected to a negative input terminal of the comparator U1.
5. The BUCK converter with overcurrent compensation as recited in claim 4, wherein the amplifying circuit comprises a fourth resistor R4, a fifth resistor R5, a first transistor Q1 and a first diode D1, wherein a base of the first transistor Q1 is connected to the output terminal of the comparator U1 and a first terminal of the fourth resistor R4, respectively, a second terminal of the fourth resistor R4 is connected to a collector of the first transistor Q1, a collector of the first transistor Q1 is further connected to a second reference voltage terminal, an emitter of the first transistor Q1 is connected to an anode of the first diode D1, a cathode of the first diode D1 is connected to a first terminal of a fifth resistor R5, and a second terminal of the fifth resistor R5 is connected to an ISERSE pin of the control IC.
6. The BUCK converter with overcurrent compensation according to claim 5, wherein the slope compensation converting circuit comprises a converting circuit and a slope compensation circuit, and the slope compensation circuit is respectively connected with the control IC and the converting circuit.
7. The BUCK converter with overcurrent compensation as recited in claim 6, wherein the slope compensation circuit comprises a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a third capacitor C3, a fourth capacitor C4 and a second transistor Q2, a first end of the sixth resistor R6 is connected to a VREF pin of the control IC, a second end of the sixth resistor R6 is connected to an RT/CT pin of the control IC, a first end of the third capacitor C3 and a base of a second transistor Q2, a second end of the third capacitor C3 is grounded, a collector of the second transistor Q2 is connected to a third reference voltage terminal, an emitter of the second transistor Q2 is connected to a first end of the seventh resistor R7, a second end of the seventh resistor R7 is connected to an ISERSE pin of the control IC, a first end of the eighth resistor R8 and a first end of the fourth capacitor C4, a second terminal of the fourth capacitor C4 is grounded, and a second terminal of the eighth resistor R8 is connected to the first terminal of the first resistor R1 and the conversion circuit, respectively.
8. The BUCK converter with over-current compensation according to claim 7, the conversion circuit comprises a ninth resistor R9, a tenth resistor R10, a fifth capacitor C5, a second diode D2, a MOS (metal oxide semiconductor) transistor, a conductance L and a power supply, the anode of the power supply is connected with the drain of the MOS tube, the source of the MOS tube is respectively connected with the cathode of the second diode D2 and the first end of the conductance L, a second end of the conductance L is respectively connected with a first end of the fifth capacitor C5 and a first end of the ninth resistor R9, a second end of the fifth capacitor C5 and a second end of the ninth resistor R9 are both connected with an anode of the second diode D2, the anode of the second diode D2 is further connected to the first end of the tenth resistor R10, and the second end of the tenth resistor R10 is connected to the second end of the eighth resistor R8 and the negative terminal of the power supply, respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022385024.7U CN213585136U (en) | 2020-10-23 | 2020-10-23 | BUCK converter with overcurrent compensation |
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| CN202022385024.7U CN213585136U (en) | 2020-10-23 | 2020-10-23 | BUCK converter with overcurrent compensation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114938129A (en) * | 2022-05-07 | 2022-08-23 | 电子科技大学 | Ramp compensation circuit of high linearity of self-adaptation |
| CN114995567A (en) * | 2022-06-20 | 2022-09-02 | 西安微电子技术研究所 | Current control type slope compensation circuit |
-
2020
- 2020-10-23 CN CN202022385024.7U patent/CN213585136U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114938129A (en) * | 2022-05-07 | 2022-08-23 | 电子科技大学 | Ramp compensation circuit of high linearity of self-adaptation |
| CN114938129B (en) * | 2022-05-07 | 2023-04-25 | 电子科技大学 | Self-adaptive high-linearity ramp compensation circuit |
| CN114995567A (en) * | 2022-06-20 | 2022-09-02 | 西安微电子技术研究所 | Current control type slope compensation circuit |
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