CN113922656A - Starting circuit, starting device and chip - Google Patents

Starting circuit, starting device and chip Download PDF

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Publication number
CN113922656A
CN113922656A CN202111216529.3A CN202111216529A CN113922656A CN 113922656 A CN113922656 A CN 113922656A CN 202111216529 A CN202111216529 A CN 202111216529A CN 113922656 A CN113922656 A CN 113922656A
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CN
China
Prior art keywords
voltage
transistor
resistor
module
power supply
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Pending
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CN202111216529.3A
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Chinese (zh)
Inventor
邓海飞
郑溢
白宗金
张小丽
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Shenzhewn Baoli Microelectronics Co ltd
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Shenzhewn Baoli Microelectronics Co ltd
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Priority to CN202111216529.3A priority Critical patent/CN113922656A/en
Publication of CN113922656A publication Critical patent/CN113922656A/en
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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
    • 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
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The application belongs to the technical field of circuit design, and provides a starting circuit, starting device and chip, and starting circuit includes: the driving transistor, the direct current conversion module, the charge pump, the linear voltage stabilization module and the feedback module, the direct current conversion module is used for performing voltage conversion processing on direct current output by the driving transistor, the charge pump boosts an input voltage signal provided by a power input end and provides a grid control signal for a grid of the driving transistor so as to control the conduction of the driving transistor, the linear voltage stabilization module generates a power supply signal according to the input voltage signal provided by the power input end so as to supply power to the direct current conversion module, the feedback module compares the power supply signal with a preset threshold voltage, and controls the charge pump to charge an output end of the linear voltage stabilization module when the voltage of the power supply signal is smaller than the preset threshold voltage, so that the voltage of the output end of the linear voltage stabilization module reaches the preset voltage value, and normal starting of a circuit is guaranteed.

Description

Starting circuit, starting device and chip
Technical Field
The application belongs to the technical field of circuit design, and particularly relates to a starting circuit, a starting device and a chip.
Background
The chip (such as a power control chip and the like) is a core component of the integrated circuit, and the normal operation of the chip plays an important role in ensuring the overall working effect of the circuit. With the wide application of chips, people have higher and higher requirements on starting of chips, such as fast starting time, low loss, low cost and the like, and more importantly, the starting process of the chips is required to meet certain stability so as to ensure normal starting and stable operation of the chips.
However, the minimum input voltage for normal operation of a direct current conversion circuit (DC-DC) is generally 3.3V, and when the input voltage is less than 3.3V, the DC-DC cannot operate normally. Generally, when the input voltage is 5V, the output voltage of a Low Dropout Regulator (LDO) is 3.3V, but when the input voltage of a power supply is unstable, for example, when the power supply voltage is less than 5V, the working voltage provided by the LDO to the DC-DC is smaller, and at this time, the DC-DC cannot normally work, and the circuit cannot be started.
Disclosure of Invention
The application aims to provide a starting circuit, a starting device and a chip, and aims to solve the problem that a circuit cannot be started when the input voltage of a power supply is low.
A first aspect of an embodiment of the present application provides a start-up circuit, including:
a drive transistor connected to the power input terminal;
the direct current conversion module is connected with the driving transistor and is used for performing voltage conversion processing on the direct current output by the driving transistor;
the charge pump is connected with the power supply input end and the driving transistor and is used for boosting an input voltage signal provided by the power supply input end and providing a grid control signal for the grid of the driving transistor;
the linear voltage stabilizing module is connected with the power supply input end and used for generating a power supply signal according to an input voltage signal provided by the power supply input end so as to supply power to the direct current conversion module;
and the feedback module is connected with the linear voltage stabilizing module and the charge pump and used for comparing the power supply signal with a preset threshold voltage and controlling the charge pump to charge the output end of the linear voltage stabilizing module when the voltage of the power supply signal is smaller than the preset threshold voltage.
In one embodiment, the feedback module comprises:
the voltage dividing unit is connected with the linear voltage stabilizing module and used for receiving the power supply signal and performing voltage dividing processing on the power supply signal to generate a voltage dividing signal;
the comparison unit is connected with the voltage division unit and used for comparing the voltage division signal with a preset threshold voltage and generating a comparison signal according to a comparison result;
and the current mirror unit is connected with the comparison unit, the linear voltage stabilizing module and the charge pump and is used for conducting according to the comparison signal so as to enable the charge pump to charge the output end of the linear voltage stabilizing module.
In one embodiment, the voltage dividing unit includes a first resistor and a second resistor, a first end of the first resistor is connected to the output end of the linear voltage stabilizing module, a second end of the first resistor and a first end of the second resistor are commonly connected to the comparing unit, and a second end of the second resistor is grounded.
In one embodiment, at least one of the first resistance and the second resistance is an adjustable resistance.
In one embodiment, the comparison unit is a comparator.
In one embodiment, the current mirror unit includes: a current source, a diode, a first transistor, a second transistor, and a third transistor;
the cathode of the diode is connected with the output end of the linear voltage stabilizing module, the anode of the diode is connected with the first end of the first transistor, the control end of the first transistor is connected with the control end of the second transistor, the first end of the second transistor is connected with the first end of the third transistor, the second end of the first transistor and the second end of the second transistor are connected to the charge pump in a shared mode, the control end of the third transistor is connected with the comparing unit, and the second end of the third transistor is connected with the current source.
In one embodiment, the driving transistor is an NMOS transistor.
In one embodiment, the linear regulator module includes: an operational amplifier, a third resistor and a fourth resistor;
the non-inverting input end of the operational amplifier is connected with the power input end, the inverting input end of the operational amplifier, the first end of the third resistor and the first end of the fourth resistor are connected in common, the output end of the operational amplifier and the second end of the third resistor are connected in common to the direct current conversion module, and the second end of the fourth resistor is grounded.
The second aspect of the embodiments of the present application further provides a starting apparatus, which includes the starting circuit as described in any one of the above.
The third aspect of the embodiments of the present application further provides a chip, including the start-up circuit described in any one of the above.
The embodiment of the application provides a starting circuit, starting device and chip, and starting circuit includes: the driving transistor, the direct current conversion module, the charge pump, the linear voltage stabilization module and the feedback module, the direct current conversion module is used for performing voltage conversion processing on direct current output by the driving transistor, the charge pump boosts an input voltage signal provided by a power input end and provides a grid control signal for a grid of the driving transistor so as to control the conduction of the driving transistor, the linear voltage stabilization module generates a power supply signal according to the input voltage signal provided by the power input end so as to supply power to the direct current conversion module, the feedback module compares the power supply signal with a preset threshold voltage, and controls the charge pump to charge an output end of the linear voltage stabilization module when the voltage of the power supply signal is smaller than the preset threshold voltage, so that the voltage of the output end of the linear voltage stabilization module reaches the preset voltage value, and normal starting of a circuit is guaranteed.
Drawings
Fig. 1 is a circuit schematic diagram of a starting circuit according to an embodiment of the present disclosure;
fig. 2 is a circuit schematic diagram of another startup circuit provided in the embodiment of the present application;
fig. 3 is a circuit diagram of a linear regulator module according to an embodiment of the present disclosure;
fig. 4 is a circuit schematic diagram of a charge pump according to an embodiment of the present disclosure.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
The starting circuit comprises a direct current (DC-DC) conversion circuit, a charge pump (CHRPUMP) and a linear Regulator (LDO), wherein an input power supply of the starting circuit is generally about 3V to 30V, the input voltage enters the DC-DC through the driving of the CHRPUMP, the other end of the starting circuit is input to the LDO for further voltage regulation to enable the output of the LDO to be stable and controllable, a third end of the starting circuit enters the CHRPUMP for boosting (gate voltage bootstrapping), and the gate Voltage (VGATE) of the normal NMOS starting circuit is about 5V greater than the voltage of an input end (VIN) of the NMOS starting circuit, so that the output of the CHRPUMP is generally 5V greater than the input voltage of the power supply for normal circuits.
Since the minimum input voltage of the normal operation of the direct current conversion circuit (DC-DC) is 3.3V, the DC-DC cannot operate normally when the input voltage is less than 3.3V. Generally, when the input voltage is 5V, the output voltage of a Low Dropout Regulator (LDO) is 3.3V, but when the input voltage of a power supply is unstable, for example, when the power supply voltage is less than 5V, the working voltage provided by the LDO to the DC-DC is smaller, and at this time, the DC-DC cannot normally work, and the circuit cannot be started.
In order to solve the above technical problem, an embodiment of the present application provides a start-up circuit, and referring to fig. 1, the start-up circuit includes: a driving transistor 20, a dc conversion module 30, a charge pump 40, a linear regulator module 50, and a feedback module 60.
Specifically, the driving transistor 20 is connected to the power input terminal 10, the dc conversion module 30 is connected to the driving transistor 20, and the dc conversion module 30 is configured to perform voltage conversion processing on the dc power output by the driving transistor 20; the charge pump 40 is connected to the power input terminal 10 and the driving transistor 20, the charge pump 40 is configured to boost an input voltage signal provided by the power input terminal 10 and provide a gate control signal to the gate of the driving transistor 20; the linear voltage stabilizing module 50 is connected to the power input terminal 10, and the linear voltage stabilizing module 50 is configured to generate a power supply signal according to an input voltage signal provided by the power input terminal 10, so as to supply power to the dc conversion module 30; the feedback module 60 is a feedback module 60 connected to the linear regulator module 50 and the charge pump 40, and configured to compare the power supply signal with a preset threshold voltage, and control the charge pump 40 to charge the output terminal of the linear regulator module 50 when the voltage of the power supply signal is smaller than the preset threshold voltage.
In this embodiment, the feedback module 60 feeds back the insufficient portion of the power supply signal output by the linear regulator module 50 to the charge pump 40, and the charge pump 40 charges the output terminal of the linear regulator module 50, so as to boost the voltage at the output terminal of the linear regulator module 50 through the charging circuit, so that the voltage of the power supply signal output by the charging circuit can supply power to the dc conversion module 30. For example, the feedback module 60 compares the power supply signal with a preset threshold voltage, and when the voltage of the power supply signal is less than the preset threshold voltage, connects the charging circuit between the charge pump 40 and the linear regulator module 50, so as to control the charge pump 40 to charge the output terminal of the linear regulator module 50, so that the voltage of the output terminal of the linear regulator module 50 reaches the preset voltage value, thereby implementing normal power supply to the dc converter module 30 and ensuring normal start of the circuit.
In one embodiment, referring to fig. 2, the feedback module 60 includes: a voltage dividing unit 61, a comparing unit 62 and a current mirror unit 63.
Specifically, the voltage dividing unit 61 is connected to the linear voltage stabilizing module 50, and is configured to receive the power supply signal and perform voltage dividing processing on the power supply signal to generate a voltage dividing signal; the comparing unit 62 is connected to the voltage dividing unit 61, and is configured to compare the voltage divided signal with a preset threshold voltage (Vref1), and generate a comparison signal according to a comparison result; the current mirror unit 63 is respectively connected to the comparing unit 62, the linear regulator module 50 and the charge pump 40, and is configured to be turned on according to the comparison signal, so that the charge pump 40 charges the output terminal of the linear regulator module 50, for example, if the divided voltage signal is smaller than the preset threshold voltage, the current mirror unit 63 charges the output terminal of the linear regulator module 50.
In this embodiment, the power supply signal output by the output end of the linear regulator module 50 is used to supply power to the dc converter module 30, the power supply signal is divided by the voltage dividing unit 61 and then output to the comparing unit 62, the comparing unit 62 compares the divided power supply signal with a preset threshold voltage, and generates a comparison signal according to the comparison result, the current mirror unit 63 performs switching control according to the level of the comparison signal, at this time, the current mirror unit 63 serves as a feedback charging circuit, and is used to be turned on when the power supply signal output by the output end of the linear regulator module 50 is lower than the working voltage of the dc converter module 30, so that the charge pump 40 charges the linear regulator module 50 to enable the power supply signal to reach the working voltage of the dc converter module 30.
For example, if the supply signal outputted from the output terminal of the linear regulator module 50 meets the requirement and can supply power to the dc conversion module 30, the feedback charging circuit (i.e., the current mirror unit 63) for charging the output terminal of the linear regulator module 50 is not triggered. When the power supply signal output by the output end of the linear voltage stabilizing module 50 is lower than a certain threshold value, the comparison signal output by the comparison unit 62 is inverted at the moment, the feedback charging circuit is turned on, because the voltage of the charge pump 40 is relatively high, the charge pump 40 with relatively high voltage charges the linear voltage stabilizing module 50 through the feedback charging circuit at the moment, when the charge reaches a certain value, the comparison signal output by the comparison unit 62 is inverted again after the output voltage of the LDO meets the requirement, and the charging feedback circuit is turned off.
In one embodiment, referring to fig. 2, the voltage dividing unit 61 includes a first resistor R1 and a second resistor R2, a first end of the first resistor R1 is connected to the output terminal of the linear regulator module 50, a second end of the first resistor R1 and a first end of the second resistor R2 are commonly connected to the comparing unit 62, and a second end of the second resistor R2 is grounded.
In this embodiment, the first resistor R1 and the second resistor R2 form a voltage divider circuit, which is used to divide the voltage of the power signal output by the linear regulator module 50, so as to adjust the voltage of the power signal to the voltage matched by the comparing unit 62.
In one embodiment, at least one of the first resistor R1 and the second resistor R2 is an adjustable resistor.
In this embodiment, the voltage division ratio can be adjusted by adjusting the resistance of the first resistor R1 or the second resistor R2, so that the starting circuit can adapt to different application scenarios.
In one embodiment, the comparison unit 62 is a comparator.
In one embodiment, referring to fig. 2, the current mirror unit 63 includes: a current source 631, a diode D1, a first transistor Q1, a second transistor Q2, and a third transistor Q3.
The cathode of the diode D1 is connected to the output terminal of the linear regulator module 50, the anode of the diode D1 is connected to the first terminal of the first transistor Q1, the control terminal of the first transistor Q1 is connected to the control terminal of the second transistor Q2, the first terminal of the second transistor Q2 is connected to the first terminal of the third transistor Q3, the second terminal of the first transistor Q1 and the second terminal of the second transistor Q2 are connected to the charge pump 40, the control terminal of the third transistor Q3 is connected to the comparator 62, and the second terminal of the third transistor Q3 is connected to the current source 631.
In this embodiment, the current mirror unit 63 serves as a feedback charging circuit, and provides a reference current signal through the stable current source 631, and the voltage at the output terminal of the linear voltage stabilizing module 50 is raised in the form of a stable current connected to the load resistor, so that the normal output value of the voltage can reach the normal operating voltage of the dc converting module 30, after the dc converting module 30 can operate normally, the output of the comparing unit 62 is inverted, and the feedback charging circuit stops operating, thereby achieving the control of the boosting degree of the voltage at the output terminal of the linear voltage stabilizing module 50.
Specifically, the first transistor Q1 and the second transistor Q2 form a cascode structure, if the divided voltage signal is smaller than the preset threshold voltage, the comparison unit 62 outputs a low-level comparison signal, the third transistor Q3 is turned on, the current source 631 provides a bias voltage, the first transistor Q1 is turned on, and outputs a mirror current to the output terminal of the linear regulator module 50, so as to ensure that the power supply signal output by the output terminal of the linear regulator module 50 meets the requirement, and the dc converter module 30 can be supplied with power.
In one embodiment, the first transistor Q1, the second transistor Q2, and the third transistor Q3 are all PMOS transistors.
In one embodiment, the driving transistor 20 is an NMOS transistor.
In one embodiment, referring to fig. 3, the linear regulator module 50 includes: an operational amplifier 51, a third resistor R3, and a fourth resistor R4.
The non-inverting input terminal of the operational amplifier 51 is connected to the power input terminal 10, the inverting input terminal of the operational amplifier 51, the first terminal of the third resistor R3, and the first terminal of the fourth resistor R4 are connected to the same terminal, the output terminal of the operational amplifier 51 and the second terminal of the third resistor R3 are connected to the dc conversion module 30, and the second terminal of the fourth resistor R4 is connected to the ground.
In this embodiment, the linear regulator block 50 may be a low dropout linear regulator that uses a transistor or Field Effect Transistor (FET) operating in its saturation region to subtract excess voltage from the applied input voltage to produce a regulated output voltage. For example, the function in the present embodiment is to step down the voltage to supply the dc conversion module 30.
Fig. 3 is a basic circuit diagram of a linear regulator module 50 according to an embodiment of the present disclosure, in which voltages at two ends of an operational amplifier 51 are equal, and a resistor is used to divide the voltages, so as to implement a required voltage division through the size of the resistor to generate a specific voltage.
Fig. 4 is a schematic circuit diagram of a charge pump 40 according to an embodiment of the present application, where the charge pump 40 includes a first comparator 41, a fifth resistor R5, a sixth resistor R6, an oscillator 42, a gate voltage bootstrap circuit 43, and a fourth switch Q4.
Specifically, a first input terminal (i.e., an inverting input terminal) of the first comparator 41 is connected to the reference voltage source Vref2, a second input terminal (i.e., a non-inverting input terminal) of the first comparator 41 and a first terminal of the fifth resistor R5 are commonly connected to a first terminal of the fourth switching tube Q4, a second terminal of the fifth resistor R5 is grounded, an output terminal of the first comparator 41 is connected to an input terminal of the oscillator 42, an output terminal of the oscillator 42 is connected to the gate voltage bootstrap circuit 43, an input terminal VIN of the gate voltage bootstrap circuit 43 and a control terminal (gate) of the fourth switching tube Q4 are commonly connected to the power input terminal 10 for receiving the input voltage signal, an output terminal VCPOUT of the gate voltage bootstrap circuit 43 is connected to a first terminal of the sixth resistor R6, and a second terminal of the sixth resistor R6 is connected to a second terminal of the fourth switching tube Q4.
In the present embodiment, the charge pump 40 functions to raise the voltage at its input terminal VIN, so that the voltage at its output terminal VCPOUT is higher than the voltage at its input terminal VIN, and the voltage difference between the two is greater than a preset voltage value (e.g., 5V). The two voltages at the input ends of the first comparator 41 are compared, when the comparison signal output by the comparator is at a high level, the oscillator 42 generates an oscillation signal to operate the gate voltage bootstrap circuit 43, when the voltage at the output end VCPOUT of the gate voltage bootstrap circuit 43 is greater than the voltage at the input end VIN by a preset voltage value (for example, the preset voltage value may be 5V), the fourth switch tube Q4 is turned on, the voltage is fed back to the second input end of the first comparator 41 through the fourth switch tube Q4, at this time, the comparison signal output by the first comparator 41 is inverted, the oscillator 42 stops operating, and the gate voltage bootstrap circuit 43 stops operating, so that the voltage at the output end VCPOUT of the charge pump 40 is greater than the voltage at the input end VIN by the preset voltage value only.
In one embodiment, the fourth switching transistor Q4 may be a PMOS transistor.
The embodiment of the application also provides a starting device, and the starting device comprises the starting circuit.
The embodiment of the application also provides a chip, which comprises the starting circuit.
The embodiment of the application provides a starting circuit, starting device and chip, and starting circuit includes: the driving transistor, the direct current conversion module, the charge pump, the linear voltage stabilization module and the feedback module, the direct current conversion module is used for performing voltage conversion processing on direct current output by the driving transistor, the charge pump boosts an input voltage signal provided by a power input end and provides a grid control signal for a grid of the driving transistor so as to control the conduction of the driving transistor, the linear voltage stabilization module generates a power supply signal according to the input voltage signal provided by the power input end so as to supply power to the direct current conversion module, the feedback module compares the power supply signal with a preset threshold voltage, and controls the charge pump to charge an output end of the linear voltage stabilization module when the voltage of the power supply signal is smaller than the preset threshold voltage, so that the voltage of the output end of the linear voltage stabilization module reaches the preset voltage value, and normal starting of a circuit is guaranteed.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims (10)

1. A start-up circuit, comprising:
a drive transistor connected to the power input terminal;
the direct current conversion module is connected with the driving transistor and is used for performing voltage conversion processing on the direct current output by the driving transistor;
the charge pump is connected with the power supply input end and the driving transistor and is used for boosting an input voltage signal provided by the power supply input end and providing a grid control signal for the grid of the driving transistor;
the linear voltage stabilizing module is connected with the power supply input end and used for generating a power supply signal according to an input voltage signal provided by the power supply input end so as to supply power to the direct current conversion module;
and the feedback module is connected with the linear voltage stabilizing module and the charge pump and used for comparing the power supply signal with a preset threshold voltage and controlling the charge pump to charge the output end of the linear voltage stabilizing module when the voltage of the power supply signal is smaller than the preset threshold voltage.
2. The startup circuit of claim 1, wherein the feedback module comprises:
the voltage dividing unit is connected with the linear voltage stabilizing module and used for receiving the power supply signal and performing voltage dividing processing on the power supply signal to generate a voltage dividing signal;
the comparison unit is connected with the voltage division unit and used for comparing the voltage division signal with a preset threshold voltage and generating a comparison signal according to a comparison result;
and the current mirror unit is connected with the comparison unit, the linear voltage stabilizing module and the charge pump and is used for conducting according to the comparison signal so as to enable the charge pump to charge the output end of the linear voltage stabilizing module.
3. The start-up circuit of claim 2, wherein the voltage dividing unit comprises a first resistor and a second resistor, a first end of the first resistor is connected to the output terminal of the linear regulator module, a second end of the first resistor and a first end of the second resistor are connected to the comparing unit in common, and a second end of the second resistor is connected to ground.
4. The startup circuit of claim 3, wherein at least one of said first resistor and said second resistor is an adjustable resistor.
5. The startup circuit of claim 2, wherein the comparison unit is a comparator.
6. The startup circuit of claim 2, wherein the current mirror unit comprises: a current source, a diode, a first transistor, a second transistor, and a third transistor;
the cathode of the diode is connected with the output end of the linear voltage stabilizing module, the anode of the diode is connected with the first end of the first transistor, the control end of the first transistor is connected with the control end of the second transistor, the first end of the second transistor is connected with the first end of the third transistor, the second end of the first transistor and the second end of the second transistor are connected to the charge pump in a shared mode, the control end of the third transistor is connected with the comparing unit, and the second end of the third transistor is connected with the current source.
7. The start-up circuit of claim 1, wherein the drive transistor is an NMOS transistor.
8. The startup circuit of claim 1, wherein the linear regulator module comprises: an operational amplifier, a third resistor and a fourth resistor;
the non-inverting input end of the operational amplifier is connected with the power input end, the inverting input end of the operational amplifier, the first end of the third resistor and the first end of the fourth resistor are connected in common, the output end of the operational amplifier and the second end of the third resistor are connected in common to the direct current conversion module, and the second end of the fourth resistor is grounded.
9. A starting device, characterized in that it comprises a starting circuit according to any one of claims 1-8.
10. A chip comprising a startup circuit according to any one of claims 1 to 8.
CN202111216529.3A 2021-10-19 2021-10-19 Starting circuit, starting device and chip Pending CN113922656A (en)

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Application Number Priority Date Filing Date Title
CN202111216529.3A CN113922656A (en) 2021-10-19 2021-10-19 Starting circuit, starting device and chip

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Application Number Priority Date Filing Date Title
CN202111216529.3A CN113922656A (en) 2021-10-19 2021-10-19 Starting circuit, starting device and chip

Publications (1)

Publication Number Publication Date
CN113922656A true CN113922656A (en) 2022-01-11

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