CN110112901B - Soft start circuit applied to voltage regulating circuit and control method thereof - Google Patents
Soft start circuit applied to voltage regulating circuit and control method thereof Download PDFInfo
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- CN110112901B CN110112901B CN201910449633.3A CN201910449633A CN110112901B CN 110112901 B CN110112901 B CN 110112901B CN 201910449633 A CN201910449633 A CN 201910449633A CN 110112901 B CN110112901 B CN 110112901B
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- 230000001105 regulatory effect Effects 0.000 title claims abstract description 88
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000003990 capacitor Substances 0.000 claims abstract description 91
- 238000001514 detection method Methods 0.000 claims abstract description 56
- 230000001276 controlling effect Effects 0.000 claims abstract description 12
- 238000010586 diagram Methods 0.000 description 3
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- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- Engineering & Computer Science (AREA)
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Abstract
The embodiment of the invention discloses a soft start circuit applied to a voltage regulating circuit and a control method thereof, wherein the soft start circuit comprises a boost driving circuit, a first capacitor and a third capacitor, and the first capacitor, the second capacitor and the third capacitor are connected in parallel; the second capacitor is connected with the primary detection change circuit, the primary detection change circuit is used for detecting the voltage of the input end and the output end of the voltage regulating circuit and controlling the on-off of the first capacitor according to the detection result, the third capacitor is connected with the secondary detection change circuit, and the secondary detection change circuit is used for detecting the voltage of the input end and the output end of the voltage regulating circuit and controlling the on-off of the third capacitor according to the detection result and the on-off condition of the second capacitor. According to the invention, a plurality of capacitors are connected in parallel, a detection change circuit for controlling on-off is arranged, the off of the capacitors is controlled in sequence under different conditions, surge current and starting time sequence are taken into account, and dynamic regulation of output voltage is realized.
Description
Technical Field
The invention relates to the technical field of starting control of voltage regulating circuits, in particular to a soft starting circuit applied to a voltage regulating circuit and a control method thereof.
Background
The voltage regulating circuit converts the input voltage according to different voltage requirements to obtain corresponding output voltage, and the voltage regulating circuit easily generates a surge circuit at the moment of outputting the voltage to influence the safety of the circuit.
As shown in fig. 1, the existing voltage regulating circuit directly connects a capacitor C on the pin of the chip SS, and realizes control of soft start time according to different charging time caused by the size of the capacitor, the larger the capacitor is, the longer the soft start time is, and the problem that the surge current is controlled by requiring longer soft start time at an instant when the capacitor is started cannot be solved according to actual conditions. In practical application, as the output voltage is higher, the soft start time can be shorter, so as to facilitate the problem of system time sequence control, but in the prior art, the problem cannot be solved only by one capacitor connected on the SS pin.
Due to the lack of a real-time adjusting function, the defects that the soft start time cannot be adjusted in real time and the surge current and the time sequence cannot be considered are brought into consideration.
Disclosure of Invention
The embodiment of the invention provides a soft start circuit applied to a voltage regulating circuit and a control method thereof, which are used for solving the problem that the soft start time of the voltage regulating circuit cannot be adjusted in real time and the surge current and the time sequence cannot be simultaneously taken into account in the prior art.
In order to solve the technical problems, the embodiment of the invention discloses the following technical scheme:
the first aspect of the invention provides a soft start circuit applied to a voltage regulating circuit, which is connected with the voltage regulating circuit, wherein the soft start circuit comprises a boost driving circuit, a first capacitor and a third capacitor, and the first capacitor, the second capacitor and the third capacitor are connected in parallel; the second capacitor is connected with the primary detection change circuit, the primary detection change circuit is used for detecting the voltage of the input end and the output end of the voltage regulating circuit and controlling the on-off of the first capacitor according to the detection result, the third capacitor is connected with the secondary detection change circuit, and the secondary detection change circuit is used for detecting the voltage of the input end and the output end of the voltage regulating circuit and controlling the on-off of the third capacitor according to the detection result and the on-off condition of the second capacitor.
Further, the primary detection change circuit comprises a first comparison unit, a second comparison unit, a first logic processor and a first switch; the first comparison unit is respectively connected with the voltage regulating circuit and the first logic processor, the second comparison unit is respectively connected with the voltage regulating circuit, the standard voltage source and the first logic processor, and the first logic processor is connected with the second capacitor through the first switch.
Further, the first comparing unit includes a first voltage dividing circuit and a comparator M1, the first voltage dividing circuit includes a resistor R1 and a resistor R2, one end of the resistor R1 is connected to an input terminal Vin of the voltage regulating circuit, the other end is respectively connected to one end of the resistor R2 and a negative input terminal of the comparator M1, the other end of the resistor R2 is grounded, a positive input terminal of the comparator M1 is connected to an output terminal Vout of the voltage regulating circuit, and an output terminal of the comparator M1 is connected to the first logic processor.
Further, the second comparing unit comprises a second voltage dividing circuit and a comparator M2, the second voltage dividing circuit comprises a resistor R3 and a resistor R4, one end of the resistor R3 is connected with the input end Vin of the voltage regulating circuit, the other end of the resistor R3 is respectively connected with the positive input end of the comparator M2 and one end of the resistor R4, the other end of the resistor R4 is grounded, the negative input end of the comparator M2 is connected with a standard voltage source, and the output end of the comparator M is connected with the first logic processor.
Further, the first logic processor is an and gate U1, the switch is a P-MOS transistor Q1, the input end of the and gate U1 is connected to the output ends of the comparator M1 and the comparator M2, the output end of the and gate U1 is connected to the gate of the P-MOS transistor Q1, the source of the P-MOS transistor Q1 is connected to the first capacitor C, and the drain is grounded through the second capacitor C2.
Further, the secondary detection change circuit comprises a third comparison unit, a second logic processor and a second switch, wherein the third comparison unit is respectively connected with the voltage regulating circuit and the second logic processor, the second logic processor is also connected with the first logic processor and the second switch, and the second switch is also respectively connected with the first capacitor and the third capacitor.
Further, the third comparing unit comprises a third voltage dividing circuit and a comparator M3, the second logic processor is an AND gate U2, and the second switch is a P-MOS tube Q2;
the third comparison circuit comprises a resistor R5 and a resistor R6, one end of the resistor R5 is connected with the input end Vin of the voltage regulating circuit, the other end of the resistor R5 is respectively connected with one end of the resistor R6 and the negative input end of the comparator M3, the other end of the resistor R6 is grounded, the positive input end of the comparator M3 is connected with the output end Vout of the voltage regulating circuit, the output end of the comparator M3 is connected with one input end of the AND gate U2, the other input end of the AND gate U2 is connected with the output end of the first logic processor, the output end of the AND gate U2 is connected with the grid electrode of the P-MOS tube Q2, the source electrode of the P-MOS tube Q2 is connected with the first capacitor C, and the drain electrode of the P-MOS tube Q is grounded through the third capacitor C3.
The second aspect of the present invention provides a control method of a soft start circuit applied to a voltage regulating circuit, based on the soft start circuit, the method includes:
the primary detection change circuit detects the input voltage and the output voltage of the voltage regulating circuit, judges whether the voltage regulating circuit passes through the surge current at the moment of starting the circuit, and the input voltage Vin reaches the design requirement;
if yes, the second capacitor is controlled to be turned off, a turn-off signal of the second capacitor is sent to the secondary detection change circuit, and if not, continuous detection is carried out;
the secondary detection change circuit detects the input voltage and the output voltage of the voltage regulating circuit and judges whether the output voltage reaches a preset value or not;
if yes, the third capacitor is controlled to be turned off, and if not, the detection is continued.
Further, the specific process of judging whether the voltage regulating circuit spends the surge current at the moment of circuit starting is as follows:
comparing the voltage of the output end of the voltage regulating circuit with the first partial voltage of the input end;
comparing the second partial voltage of the voltage at the input end of the voltage regulating circuit with the voltage of the standard voltage source;
when the voltage of the output end of the voltage regulating circuit is larger than the first voltage division of the voltage of the input end of the voltage regulating circuit and the second voltage division of the voltage of the input end of the voltage regulating circuit is larger than the voltage of the standard voltage source, the voltage regulating circuit passes through the surge current at the moment of circuit starting.
Further, the specific process of judging whether the output voltage reaches the preset value is as follows:
comparing the voltage of the output end of the voltage regulating circuit with the third partial voltage of the input end;
when the voltage of the output end of the voltage regulating circuit is larger than the third voltage division of the voltage of the input end and the turn-off signal of the second capacitor is received, the output voltage reaches a preset value.
The effects provided in the summary of the invention are merely effects of embodiments, not all effects of the invention, and one of the above technical solutions has the following advantages or beneficial effects:
by connecting a plurality of capacitors in parallel, a detection change circuit for controlling on-off is arranged for the other capacitors except the first capacitor, the detection change circuit detects the voltage change of the input end and the output end of the voltage regulating circuit in real time, and the turn-off of the other capacitors is controlled in sequence under different conditions, so that the surge current and the starting time sequence are considered.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic diagram of a prior art soft start circuit;
FIG. 2 is a schematic diagram of a soft start circuit according to the present invention;
FIG. 3 is a circuit diagram of a soft start circuit according to the present invention;
fig. 4 is a flow chart of a control method of the soft start circuit according to the present invention.
In the figure, 1 step-up driving circuit, 2 primary detection changing circuit, and 3 secondary detection changing circuit.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the present invention will be described in detail below with reference to the following detailed description and the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different structures of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted so as to not unnecessarily obscure the present invention.
As shown in fig. 2 and 3, the soft start circuit of the present invention is connected to a voltage regulating circuit, and the soft start circuit includes a boost driving circuit 1, a primary detection changing circuit 2, a secondary detection changing circuit 3, a first capacitor C connected to an SS pin of a voltage regulating circuit chip, a second capacitor C2 connected in parallel to the first capacitor, and a third capacitor C3. The second capacitor is connected with the primary detection change circuit 2, the primary detection change circuit is used for detecting the voltage of the input end and the output end of the voltage regulating circuit and controlling the on-off of the first capacitor according to the detection result, the third capacitor is connected with the secondary detection change circuit 3, and the secondary detection change circuit 3 is used for detecting the voltage of the input end and the output end of the voltage regulating circuit and controlling the on-off of the third capacitor according to the detection result and the on-off condition of the second capacitor.
The boost driving circuit 1 comprises a capacitor C1 and a diode D2, one end of the capacitor C1 is connected with the output end Vout of the voltage regulating circuit, the other end of the capacitor C1 is connected with the cathode of the diode D1, the anode of the diode D1 is connected with the input end Vin of the voltage regulating circuit, and the driving voltage Vdriver is output by the cathode of the diode D1. The output voltage Vout charges the capacitor C1 through the diode D1, and after the circuit works, the output voltage Vout rises to form a bootstrap circuit, so that the driving voltage Vdriver is ensured to be larger than Vin and Vout.
The primary detection change circuit comprises a first comparison unit, a second comparison unit, a first logic processor and a first switch; the first comparison unit is respectively connected with the voltage regulating circuit and the first logic processor, the second comparison unit is respectively connected with the voltage regulating circuit, the standard voltage source and the first logic processor, and the first logic processor is connected with the second capacitor through the first switch.
The first comparison unit comprises a first voltage dividing circuit and a comparator M1, the first voltage dividing circuit comprises a resistor R1 and a resistor R2, one end of the resistor R1 is connected with an input end Vin of the voltage regulating circuit, the other end of the resistor R1 is respectively connected with one end of the resistor R2 and a negative input end of the comparator M1, the other end of the resistor R2 is grounded, the positive input end of the comparator M1 is connected with an output end Vout of the voltage regulating circuit, and the output end of the comparator M1 is connected with a first logic processor. The second comparison unit comprises a second voltage dividing circuit and a comparator M2, the second voltage dividing circuit comprises a resistor R3 and a resistor R4, one end of the resistor R3 is connected with the input end Vin of the voltage regulating circuit, the other end of the resistor R3 is respectively connected with the positive input end of the comparator M2 and one end of the resistor R4, the other end of the resistor R4 is grounded, the negative input end of the comparator M2 is connected with a standard voltage source, and the output end of the comparator M2 is connected with the first logic processor. The first logic processor is an AND gate U1, the switch is a P-MOS tube Q1, the input end of the AND gate U1 is respectively connected with the output ends of the comparator M1 and the comparator M2, the output end of the AND gate U1 is connected with the grid electrode of the P-MOS tube Q1, the source electrode of the P-MOS tube Q1 is connected with the first capacitor C, and the drain electrode is grounded through the second capacitor C2.
Before the primary detection change circuit works, the SS pin is connected with the first capacitor C, the second capacitor C2 and the third capacitor C3, the first capacitor C, the second capacitor C2 and the third capacitor C3 are in a parallel state, at the moment, the SS pin is connected with the capacitor with the largest capacitance, so that the soft start time is longest, the surge current at the starting moment is avoided, the output voltage Vout is used as the positive input end of the comparator M1, the first partial voltage formed by the input voltage Vin through the voltage dividing resistor R1 and the resistor R2 is used as the negative input end of the M1, and when the Vout is only larger than the first partial voltage of Vin, the M1 outputs a high level, so that the surge current at the starting moment is spent, and the soft start time can be reduced. In addition, the second voltage division formed by the input voltage Vin passing through the voltage dividing resistors R3 and R4 is used as the positive input end of the comparator M2, the standard voltage source DC is used as the negative input end of the comparator M2, the standard voltage source DC can be obtained through the input voltage Vin by using a voltage stabilizing tube or a standard voltage circuit, the comparator M2 outputs high voltage only when the second voltage division of Vin is higher than the standard voltage source voltage, at this moment, vin reaches the minimum voltage required by design, the soft start speed can be accelerated, the and gate U1 outputs high voltage only when the comparator M1 and the comparator M2 both output high voltage, the P-mosfet Q1 is cut off, the second capacitor C2 is disconnected from the connection with the SS pin, the capacity of the SS pin connection capacitor is reduced, the charging time is shortened, and the soft start time is shortened.
The secondary detection change circuit comprises a third comparison unit, a second logic processor and a second switch, wherein the third comparison unit is respectively connected with the voltage regulating circuit and the second logic processor, the second logic processor is also connected with the first logic processor and the second switch, and the second switch is also respectively connected with the first capacitor and the third capacitor.
The third comparison unit comprises a third voltage division circuit and a comparator M3, the second logic processor is an AND gate U2, and the second switch is a P-MOS tube Q2; the third comparison circuit comprises a resistor R5 and a resistor R6, one end of the resistor R5 is connected with the input end Vin of the voltage regulating circuit, the other end of the resistor R5 is respectively connected with one end of the resistor R6 and the negative input end of the comparator M3, the other end of the resistor R6 is grounded, the positive input end of the comparator M3 is connected with the output end Vout of the voltage regulating circuit, the output end of the comparator M3 is connected with one input end of the AND gate U2, the other input end of the AND gate U2 is connected with the output end of the first logic processor, the output end of the AND gate U2 is connected with the grid electrode of the P-MOS tube Q2, the source electrode of the P-MOS tube Q2 is connected with the first capacitor C, and the drain electrode of the P-MOS tube Q is grounded through the third capacitor C3.
The secondary detection change circuit 3 uses the output voltage Vout as the positive input end of the comparator M3, the third voltage division formed by the voltage division resistor R5 and the resistor R6 of the input voltage Vin is used as the negative input end of the comparator M3, the M3 outputs a high level only when Vout is larger than Vin, and the output voltage Vout is used as one input end of the and gate U2, which means that the output voltage has risen to a preset value at this time to further reduce the soft start time, in addition, the output of the primary detection change circuit M2 is used as the other input end of the U2, the input voltage is ensured to be normal, the U2 outputs a high voltage only when both M2 and M3 output a high voltage, the P-mosfet Q2 is cut off, the third capacitor C3 is disconnected from the SS pin, the capacity of the SS pin is reduced to the minimum, and the charging time and the soft start time become the shortest.
The surge current at the output end of the voltage regulating circuit mainly occurs at the starting moment and descends along with the rising of the output voltage.
As shown in fig. 4, the control process of the soft start circuit of the present invention is: the primary detection change circuit detects the input voltage and the output voltage of the voltage regulating circuit, judges whether the voltage regulating circuit passes through the surge current at the moment of starting the circuit, and the input voltage Vin reaches the design requirement; if yes, the second capacitor is controlled to be turned off, a turn-off signal of the second capacitor is sent to the secondary detection change circuit, and if not, continuous detection is carried out; the secondary detection change circuit detects the input voltage and the output voltage of the voltage regulating circuit and judges whether the output voltage reaches a preset value or not; if yes, the third capacitor is controlled to be turned off, and if not, the detection is continued.
The specific process for judging whether the voltage regulating circuit passes through the surge current at the moment of circuit starting is as follows: comparing the voltage of the output end of the voltage regulating circuit with the first partial voltage of the input end; comparing the second partial voltage of the voltage at the input end of the voltage regulating circuit with the voltage of the standard voltage source; when the voltage of the output end of the voltage regulating circuit is larger than the first voltage division of the voltage of the input end of the voltage regulating circuit and the second voltage division of the voltage of the input end of the voltage regulating circuit is larger than the voltage of the standard voltage source, the voltage regulating circuit passes through the surge current at the moment of circuit starting.
The specific process for judging whether the input voltage Vin meets the design requirement is as follows: and comparing the second voltage division of the input voltage of the voltage regulating circuit with the standard voltage source, and when the second voltage division of the input voltage of the voltage regulating circuit is larger than the standard voltage source, considering that the input voltage Vin reaches the design requirement.
The specific process for judging whether the output voltage reaches the preset value is as follows: comparing the voltage of the output end of the voltage regulating circuit with the third partial voltage of the input end; when the voltage of the output end of the voltage regulating circuit is larger than the third voltage division of the voltage of the input end and the turn-off signal of the second capacitor is received, the output voltage reaches a preset value.
The foregoing is only a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that numerous modifications and variations can be made without departing from the principles of the invention, and such modifications and variations are considered to be within the scope of the invention.
Claims (5)
1. The soft start circuit is applied to the voltage regulating circuit and is connected with the voltage regulating circuit, and is characterized by comprising a boost driving circuit, a first capacitance circuit, a second capacitance circuit and a third capacitance circuit, wherein the first capacitance circuit, the second capacitance circuit and the third capacitance circuit are connected in parallel; the first capacitor circuit is composed of a first capacitor, one end of the first capacitor is connected with an SS pin of a chip of the voltage regulating circuit, and the other end of the first capacitor is grounded; the second capacitor circuit is connected with the primary detection change circuit, the primary detection change circuit is used for detecting the voltage of the input end and the output end of the voltage regulating circuit and controlling the on-off of the second capacitor circuit according to the detection result, the third capacitor circuit is connected with the secondary detection change circuit, and the secondary detection change circuit is used for detecting the voltage of the input end and the output end of the voltage regulating circuit and controlling the on-off of the third capacitor circuit according to the detection result and the on-off condition of the second capacitor circuit; the primary detection change circuit comprises a first comparison unit, a second comparison unit, a first logic processor and a first switch; the first logic processor is an AND gate U1, and the first switch is a P-MOS transistor Q1; the first comparison unit comprises a first voltage dividing circuit and a comparator M1, the first voltage dividing circuit comprises a resistor R1 and a resistor R2, one end of the resistor R1 is connected with an input end Vin of the voltage regulating circuit, the other end of the resistor R1 is respectively connected with one end of the resistor R2 and a negative input end of the comparator M1, the other end of the resistor R2 is grounded, a positive input end of the comparator M1 is connected with an output end Vout of the voltage regulating circuit, and an output end of the comparator M1 is connected with a first input end of the AND gate U1; the second comparison unit comprises a second voltage dividing circuit and a comparator M2, the second voltage dividing circuit comprises a resistor R3 and a resistor R4, one end of the resistor R3 is connected with the input end Vin of the voltage regulating circuit, the other end of the resistor R3 is respectively connected with the positive input end of the comparator M2 and one end of the resistor R4, the other end of the resistor R4 is grounded, the negative input end of the comparator M2 is connected with a standard voltage source, the output end of the comparator M2 is connected with the second input end of an AND gate U1, the output end of the AND gate U1 is connected with the grid electrode of a P-MOS tube Q1, the source electrode of the P-MOS tube Q1 is connected with one end of the first capacitor, and the drain electrode is grounded through the second capacitor; the secondary detection change circuit comprises a third comparison unit, a second logic processor and a second switch, wherein the third comparison unit is respectively connected with the voltage regulating circuit and the second logic processor; the first input end of the second logic processor is connected with the output end of the AND gate U1, the second input end of the second logic processor is connected with the output end of the third comparison unit, and the output end of the second logic processor is connected with the control end of the second switch; the second switch is a P-MOS tube Q2, the source electrode of the second switch is connected with one end of the first capacitor, and the drain electrode of the second switch is grounded through the third capacitor.
2. The soft start circuit for a voltage regulator circuit according to claim 1, wherein the third comparing unit comprises a third voltage dividing circuit and a comparator M3, the second logic processor is an and gate U2, the third voltage dividing circuit comprises a resistor R5 and a resistor R6, one end of the resistor R5 is connected to the input terminal Vin of the voltage regulator circuit, the other end is respectively connected to one end of the resistor R6 and the negative input terminal of the comparator M3, the other end of the resistor R6 is grounded, the positive input terminal of the comparator M3 is connected to the output terminal Vout of the voltage regulator circuit, the output terminal of the comparator M3 is connected to the second input terminal of the and gate U2, and the output terminal of the and gate U2 is connected to the gate of the P-MOS transistor Q2.
3. A control method of a soft start circuit applied to a voltage regulating circuit, based on the soft start circuit of any of claims 1-2, characterized in that the method comprises:
before the primary detection change circuit works, the first capacitance circuit, the second capacitance circuit and the third capacitance circuit are all turned on;
the primary detection change circuit detects the input voltage and the output voltage of the voltage regulating circuit and judges whether the voltage regulating circuit passes through the surge current at the moment of starting the circuit;
if yes, the second capacitance circuit is controlled to be turned off, a turn-off signal of the second capacitance circuit is sent to the secondary detection change circuit, and if not, continuous detection is carried out;
the secondary detection change circuit detects the input voltage and the output voltage of the voltage regulating circuit, judges whether the output voltage reaches a preset value or not, and the input voltage Vin reaches the design requirement;
if yes, the third capacitor circuit is controlled to be turned off, and if not, the detection is continued.
4. The method for controlling a soft start circuit applied to a voltage regulator circuit according to claim 3, wherein the specific process of determining whether the voltage regulator circuit is passing the surge current at the circuit on moment is as follows:
comparing the voltage of the output end of the voltage regulating circuit with the first partial voltage of the input end;
comparing the second partial voltage of the voltage at the input end of the voltage regulating circuit with the voltage of the standard voltage source;
when the voltage of the output end of the voltage regulating circuit is larger than the first voltage division of the voltage of the input end of the voltage regulating circuit and the second voltage division of the voltage of the input end of the voltage regulating circuit is larger than the voltage of the standard voltage source, the voltage regulating circuit passes through the surge current at the moment of circuit starting.
5. The method for controlling a soft start circuit applied to a voltage regulator circuit according to claim 4, wherein the specific process of determining whether the output voltage reaches the preset value is:
comparing the voltage of the output end of the voltage regulating circuit with the third partial voltage of the input end;
when the voltage of the output end of the voltage regulating circuit is larger than the third voltage division of the voltage of the input end and the turn-off signal of the second capacitor circuit is received, the output voltage reaches a preset value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910449633.3A CN110112901B (en) | 2019-05-28 | 2019-05-28 | Soft start circuit applied to voltage regulating circuit and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910449633.3A CN110112901B (en) | 2019-05-28 | 2019-05-28 | Soft start circuit applied to voltage regulating circuit and control method thereof |
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| CN110112901A CN110112901A (en) | 2019-08-09 |
| CN110112901B true CN110112901B (en) | 2024-03-12 |
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| CN108322030A (en) * | 2018-01-25 | 2018-07-24 | 郑州云海信息技术有限公司 | A kind of novel discharge circuit and method |
| CN108496291A (en) * | 2018-02-28 | 2018-09-04 | 深圳辰锐软件开发有限公司 | Farad capacitor charging circuit and electronic equipment |
| CN209896903U (en) * | 2019-05-28 | 2020-01-03 | 苏州浪潮智能科技有限公司 | Soft start circuit applied to voltage regulating circuit |
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2019
- 2019-05-28 CN CN201910449633.3A patent/CN110112901B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205004952U (en) * | 2015-09-25 | 2016-01-27 | 深圳微步信息股份有限公司 | Direct current soft start circuit |
| CN106782425A (en) * | 2017-03-30 | 2017-05-31 | 深圳市华星光电技术有限公司 | The input voltage rise time controls circuit |
| CN108322030A (en) * | 2018-01-25 | 2018-07-24 | 郑州云海信息技术有限公司 | A kind of novel discharge circuit and method |
| CN108496291A (en) * | 2018-02-28 | 2018-09-04 | 深圳辰锐软件开发有限公司 | Farad capacitor charging circuit and electronic equipment |
| CN209896903U (en) * | 2019-05-28 | 2020-01-03 | 苏州浪潮智能科技有限公司 | Soft start circuit applied to voltage regulating circuit |
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