CN116865556A - Charge pump precharge circuit and electronic device - Google Patents

Charge pump precharge circuit and electronic device Download PDF

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Publication number
CN116865556A
CN116865556A CN202310927841.6A CN202310927841A CN116865556A CN 116865556 A CN116865556 A CN 116865556A CN 202310927841 A CN202310927841 A CN 202310927841A CN 116865556 A CN116865556 A CN 116865556A
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CN
China
Prior art keywords
charge pump
switching tube
signal
coupled
switch tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310927841.6A
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Chinese (zh)
Inventor
邱星福
符志岗
欧新华
袁琼
陈敏
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Shanghai Xindao Electronic Technology Co ltd
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Shanghai Xindao Electronic Technology Co ltd
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Application filed by Shanghai Xindao Electronic Technology Co ltd filed Critical Shanghai Xindao Electronic Technology Co ltd
Priority to CN202310927841.6A priority Critical patent/CN116865556A/en
Publication of CN116865556A publication Critical patent/CN116865556A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0041—Control circuits in which a clock signal is selectively enabled or disabled
    • 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
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • 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
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

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

Abstract

The invention provides a charge pump precharge circuit and electronic equipment, wherein a power tube unit comprises a first switch tube, a second switch tube, a third switch tube and a fourth switch tube which are electrically connected, wherein the first switch tube is connected with a power supply voltage and is coupled with a bootstrap capacitor through a diode, the bootstrap capacitor is respectively coupled with a second switch tube and a flying capacitor, the flying capacitor is respectively coupled with the fourth switch tube and the precharge circuit, the fourth switch tube is grounded, and one end of the second switch tube is respectively coupled with an output end of the charge pump and an output capacitor; in the precharge circuit, a fifth switch tube is coupled with a flying capacitor through a current-limiting resistor, the other end of the fifth switch tube is grounded, and a protection module and an insertion detection module are both coupled with the output end of the charge pump; when the device is connected to the charge pump, the fifth switching tube is controlled to be conducted within a set time period, the battery is used for charging the flying capacitor, and a pre-charging circuit is simplified, so that the charge pump can be pre-charged rapidly under the condition that whether the pre-charging is completed or not is confirmed by an external device.

Description

Charge pump precharge circuit and electronic device
Technical Field
The present invention relates to the field of power electronics, and in particular, to a charge pump precharge circuit and an electronic device.
Background
In recent years, a charge pump is used as a non-inductive DC-DC converter, and a capacitor is used as an energy storage element for voltage conversion, so that the charge pump has the advantages of high conversion efficiency and the like, and is widely applied in the field of power supply, particularly in the field of fast charging.
In a power conversion circuit using a charge pump, a flying capacitor and a bootstrap capacitor (as shown in fig. 1) are often required, wherein the flying capacitor is used for completing transfer of accessed charges from input to output, so that the voltage at the output end of the power conversion circuit can float to different voltage levels, and the bootstrap capacitor is used for completing bootstrap boosting of a driving circuit of a high-side power tube. In practical application, before the power conversion circuit starts to work, the flying capacitor needs to be precharged, and the voltage values at two ends of the flying capacitor need to be charged to be close to the pre-output voltage of the power conversion circuit, if the power conversion circuit is not precharged, a great current exists in the instant circuit when the power switch is opened, so that all power devices in the circuit are burnt.
In the existing circuit soft start architecture, please refer to fig. 1, a current source is generally used to charge the flying capacitor, however, the charging speed is slower, in actual use, an external overvoltage protection circuit needs to be started, and the current source can be used to charge the flying capacitor after being established; and this charging scheme also requires an additional comparator to compare the voltage across the flying capacitor with the pre-output voltage to determine when the pre-charge is completed.
Therefore, how to quickly precharge the charge pump without requiring an external device to confirm whether the precharge is completed, and to simplify the precharge circuit, has become a technical problem to be solved in the industry.
Disclosure of Invention
The invention provides a charge pump pre-charging circuit and electronic equipment, which are used for solving the problem of rapidly pre-charging a charge pump and simplifying a pre-charging circuit under the condition that an external device is not required to confirm whether the pre-charging is completed.
According to a first aspect of the present invention, there is provided a charge pump pre-charge circuit for charging a battery of an accessed device, the charge pump comprising N power modules, each group of power modules comprising a power transistor unit, a bootstrap capacitor and a flying capacitor, wherein N is a positive integer; wherein:
the power tube unit comprises a first switch tube, a second switch tube, a third switch tube and a fourth switch tube which are electrically connected in sequence, wherein the first end of the first switch tube is coupled to a power supply voltage, the first end of the first switch tube is also coupled to the first end of the bootstrap capacitor through a diode, the second end of the bootstrap capacitor is respectively coupled to the first end of the second switch tube and the first end of the flying capacitor, the second end of the flying capacitor is respectively coupled to the first end of the fourth switch tube and the first end of the precharge circuit, the second end of the fourth switch tube is grounded, the second end of the second switch tube is used as an output end of the power module, the second end of the second switch tube is respectively coupled to the output end of the charge pump and the first end of the output capacitor, and the negative electrode of the battery and the second end of the output capacitor are both grounded;
the precharge circuit comprises a protection module, an insertion detection module, a control module, a fifth switching tube and a current-limiting resistor; the first end of the fifth switch tube is coupled to the second end of the flying capacitor through the current limiting resistor, the second end of the fifth switch tube is grounded, the first end of the protection module and the first end of the insertion detection module are both coupled to the output end of the charge pump, the second end of the protection module is grounded, the second end of the insertion detection module is coupled to the first end of the control module, and the second end of the control module is coupled to the control end of the fifth switch tube; wherein:
the insertion detection module is used for monitoring the voltage of the first end of the insertion detection module in real time and outputting a first signal to the control module according to the detected voltage, wherein the first signal is used for representing whether equipment is connected to the charge pump or not;
the control module is configured to: setting a set time length, and controlling the fifth switching tube to be switched on in the set time length when the first signal is characterized in that equipment is connected to the charge pump, and switching off after the set time length is exceeded; and controlling the fifth switching tube to be opened when the first signal is characterized in that the device is not connected to the charge pump.
Optionally, the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are NMOS tubes or NPN type BJT triodes.
Optionally, the control module is specifically configured to:
when the first signal is characterized in that equipment is connected to the charge pump, a high level is output to the control end of the fifth switching tube through the second end of the first signal in the set time period so as to control the fifth switching tube to be conducted, and a low level is output to the control end of the fifth switching tube through the second end of the first signal after the set time period is exceeded so as to control the fifth switching tube to be disconnected;
when the first signal is characterized in that the equipment is not connected to the charge pump, a low level is output to the control end of the fifth switching tube through the second end of the first signal so as to control the fifth switching tube to be disconnected.
Optionally, the control module is further configured to set a spike duration; the control module comprises a first timing unit and a logic control unit; wherein:
the first end of the first timing unit is coupled to the first end of the insertion detection module, the second end of the first timing unit is coupled to a clock signal, and the third end of the first timing unit is coupled to the first end of the logic control unit so as to output a first time signal; the second end of the logic control unit receives the clock signal, and the third end of the logic control unit is coupled to the control end of the fifth switching tube; wherein the first time signal comprises a first sub-signal and a second sub-signal;
wherein the first timing unit is configured to: only when the first signal is characterized in that the equipment is connected to the charge pump, starting to count the connection time of the equipment, and outputting the first sub-signal to the first end of the logic control unit after the anti-spike pulse duration; otherwise, outputting the second sub-signal to the first end of the logic control unit;
the logic control unit is configured to: starting timing when the first end of the fifth switching tube receives the first sub-signal, outputting a high level to the control end of the fifth switching tube through the second end of the fifth switching tube in the set time period so as to control the fifth switching tube to be conducted, and outputting a low level to the control end of the fifth switching tube through the second end of the fifth switching tube after the set time period is exceeded so as to control the fifth switching tube to be disconnected;
when the first end of the first sub-signal receives the second sub-signal, the second end of the first sub-signal outputs a low level to the control end of the fifth switching tube so as to control the fifth switching tube to be disconnected.
Optionally, the fourth terminal of the logic control unit receives an enable clock signal to set the set duration, and the fifth terminal thereof receives a power-on reset signal.
Optionally, the insertion detection module includes a comparator;
the non-inverting input end of the comparator is coupled to the output end of the charge pump, the inverting input end of the comparator receives a reference voltage, and the output end of the comparator is coupled to the first end of the control module.
Optionally, the protection module includes a first capacitor and a first resistor;
the first end of the first capacitor and the first end of the first resistor are coupled to the output end of the charge pump, and the second end of the first capacitor and the second end of the first resistor are grounded.
Optionally, the protection module includes a second capacitor and a sixth switching tube;
the first end of the second capacitor and the first end of the sixth switching tube are both coupled to the output end of the charge pump, the second end of the second capacitor and the second end of the sixth switching tube are both grounded, and the control end of the sixth switching tube is coupled to the second end of the control module.
Optionally, the control module is further configured to:
when the first signal is characterized in that equipment is connected to the charge pump, the sixth switching tube is controlled to be connected in the set time period, and is disconnected after the set time period is exceeded; and controlling the sixth switching tube to be opened when the first signal is characterized in that the device is not connected to the charge pump.
Optionally, the charge pump is a half-voltage power conversion circuit.
According to a third aspect of the present invention there is provided an electronic device comprising the charge pump precharge circuit provided in any one of the first aspects of the present invention.
In the charge pump precharge circuit and the electronic device provided by the invention, the power tube unit comprises a first switch tube, a second switch tube, a third switch tube and a fourth switch tube which are electrically connected, wherein the first switch tube is coupled to a power supply voltage and is also coupled to a bootstrap capacitor through a diode, the bootstrap capacitor is respectively coupled to the second switch tube and a flying capacitor, the flying capacitor is respectively coupled to the fourth switch tube and the precharge circuit, the fourth switch tube is further grounded, one end of the second switch tube is used as an output end of the power module and is also respectively coupled to an output end and an output capacitor of the charge pump, and both the negative electrode of the battery and the output capacitor are grounded; in the precharge circuit, a fifth switching tube is coupled to the flying capacitor through a current limiting resistor, and a protection module and an insertion detection module are both coupled to the output end of the charge pump; the protection module and a fifth switch tube are grounded; when the device is connected to the charge pump, the fifth switching tube is controlled to be conducted within a set time period, and the battery is used for charging the flying capacitor, so that a pre-charging circuit is simplified, and the charge pump can be pre-charged rapidly under the condition that whether the pre-charging is completed or not is confirmed by an external device.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art charge pump precharge circuit configuration;
FIG. 2 is a schematic diagram of a charge pump precharge circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a charge pump precharge circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a charge pump precharge circuit according to an embodiment of the present invention;
reference numerals illustrate:
11-a power module;
21-a protection module;
22-an insertion detection module;
23-a control module;
231-a first timing unit;
232-a logic control unit;
cboot-bootstrap capacitance;
cfly-flying capacitor;
q1-a first switching tube;
q2-a second switching tube;
q3-a third switching tube;
q4-fourth switching tube;
q9-a fifth switching tube;
q10-a tenth switching tube;
q11-sixth switching tube;
PMID-supply voltage;
cout-output capacitance;
RL-current limiting resistor;
a CLK-clock signal;
en_clk-enable clock signal;
POR-power-on reset signal;
c1-a first capacitance;
c2-a second capacitance;
r1-a first resistor.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terms "first," "second," "third," "fourth" and the like in the description and in the claims and in the above drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The technical scheme of the invention is described in detail below by specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.
In view of the prior art, it is difficult to rapidly precharge the charge pump without requiring an external device to confirm whether the precharge is completed, and simplify a precharge circuit. The invention provides a charge pump pre-charge circuit and electronic equipment, wherein a power tube unit comprises a first switch tube, a second switch tube, a third switch tube and a fourth switch tube which are electrically connected, wherein the first switch tube is coupled to a power supply voltage and is also coupled to a bootstrap capacitor through a diode, the bootstrap capacitor is respectively coupled to the second switch tube and a flying capacitor, the flying capacitor is respectively coupled to the fourth switch tube and the pre-charge circuit, the fourth switch tube is also grounded, one end of the second switch tube is used as an output end of a power module and is also respectively coupled to an output end of the charge pump and an output capacitor, and both a negative electrode of a battery and the output capacitor are grounded; in the precharge circuit, a fifth switching tube is coupled to the flying capacitor through a current limiting resistor, and a protection module and an insertion detection module are both coupled to the output end of the charge pump; the protection module and a fifth switch tube are grounded; when the device is connected to the charge pump, the fifth switching tube is controlled to be conducted within a set time period, and the battery is used for charging the flying capacitor, so that a pre-charging circuit is simplified, and the charge pump can be pre-charged rapidly under the condition that whether the pre-charging is completed or not is confirmed by an external device.
Referring to fig. 2, an embodiment of the present invention provides a charge pump pre-charging circuit, where the charge pump is used for charging a battery of an accessed device, and the charge pump includes N power modules 11, each group of power modules 11 includes a power tube unit, a bootstrap capacitor Cboot and a flying capacitor Cfly, where N is a positive integer; wherein:
taking the left power tube unit in fig. 2 as an example, the power tube unit includes a first switch tube Q1, a second switch tube Q2, a third switch tube Q3 and a fourth switch tube Q4 that are electrically connected in sequence, wherein a first end of the first switch tube Q1 is coupled to a supply voltage PMID, a first end of the first switch tube Q1 is further coupled to a first end of the bootstrap capacitor Cboot1 through a diode D9, a second end of the bootstrap capacitor Cboot1 is coupled to a first end of the second switch tube Q2 and a first end of the flying capacitor Cfly1, a second end of the flying capacitor Cfly1 is coupled to a first end of the fourth switch tube Q4 and a first end of a precharge circuit, a second end of the fourth switch tube Q4 is grounded, a second end of the second switch tube Q2 is used as an output end of the power module 11, and is coupled to a first end of the output of the battery and a second end of the battery, and a capacitor Cout of the battery is coupled to a first end of the battery and a second end of the battery, and a capacitor Cout of the battery is coupled to a capacitor of the output of the battery is coupled to the output of the battery;
the precharge circuit comprises a protection module 21, an insertion detection module 22, a control module 23, a fifth switching tube Q9 and a current limiting resistor RL1; the first end of the fifth switch tube Q9 is coupled to the second end of the flying capacitor Cfly through the current limiting resistor RL1, the second end of the fifth switch tube Q9 is grounded, the first end of the protection module 21 and the first end of the insertion detection module 22 are both coupled to the output end of the charge pump, the second end of the protection module 21 is grounded, the second end of the insertion detection module 22 is coupled to the first end of the control module 23, and the second end of the control module 23 is coupled to the control end of the fifth switch tube Q9; wherein:
the insertion detection module 22 is configured to monitor the voltage VBAT of the first end in real time, and output a first signal to the control module 23 according to the detected voltage, where the first signal is used to characterize whether a device is connected to the charge pump;
the control module 23 is configured to: setting a set time length, and controlling the fifth switching tube Q9 to be switched on in the set time length when the first signal is characterized in that equipment is connected to the charge pump, and switching off after the set time length is exceeded; and when the first signal is characterized in that the device is not connected to the charge pump, controlling the fifth switching tube Q9 to be disconnected.
The first switching tube Q1, the second switching tube Q2, the third switching tube Q3 and the fourth switching tube Q4 are NMOS tubes or NPN BJT transistors.
Regarding the right power module in fig. 2, which is connected in the same manner as the left power module, in one example, the control module 23 is further coupled to a control terminal (not shown in fig. 2) of the tenth switching tube Q10, for controlling the on/off of the tenth switching tube Q10, where when the first signal is characterized as that the device is connected to the charge pump, the tenth switching tube Q10 is controlled to be turned on for the set period of time, and turned off after exceeding the set period of time; and when the first signal is characterized in that the device is not connected to the charge pump, controlling the tenth switching tube Q10 to be disconnected.
In case of a plurality of power modules, in a preferred embodiment, the control module 23 is further configured for:
and charging the flying capacitor Cfly corresponding to each power module in sequence according to a preset sequence.
In the example shown in fig. 2, the charge pump is a half-voltage power conversion circuit, which includes two power modules 11, which will be further described by way of example.
At this 2: in the half-voltage power conversion circuit, the output end of the charge pump is coupled to the battery of the device, the voltage value of the power supply voltage PMID is set to be twice the voltage value of the battery, and the voltage value of the power supply voltage PMID is set to be slightly more than twice the voltage value of the battery in actual setting because of voltage loss caused by circuit elements thereof.
Taking the left power module 11 as an example, the control ends of the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, and the fourth switching tube Q4 respectively receive a first control signal CHG1, a second control signal DHG1, a third control signal CLG1, and a fourth control signal DLG1; setting the on or off time length of each switch tube according to the number of the power modules 11 in the charge pump;
if the clock signal CLK received by the charge pump is in the first phase, the first switching tube Q1 and the third switching tube Q3 are controlled to be closed, the second switching tube Q2 and the fourth switching tube Q4 are opened, and the flying capacitor Cfly and the output capacitor Cout are connected in series and divided, in this case:
Vcfly+Vcout＝VIN；
if the clock signal CLK received by the charge pump is in the second phase, the second switching tube Q2 and the fourth switching tube Q4 are controlled to be closed, the first switching tube Q1 and the third switching tube Q3 are opened, and the flying capacitor Cfly and the output capacitor Cout are connected in parallel, in this case:
Vcfly＝Vcout；
wherein Vcfly is the voltage value of the flying capacitor Cfly, vcout is the voltage value of the output capacitor Cout, and VIN is the voltage value of the second end of the bootstrap capacitor Cboot.
To sum up, the voltage value vcout=vin/2 of the output capacitor Cout; according to the principle of conservation of power, the current iout=2×ivin flowing into the battery; where Ivin is a current value of a current flowing through the second switching transistor Q2 or the third switching transistor Q3.
According to the working principle of the power conversion circuit, before the power conversion circuit starts to work, the flying capacitor Cfly needs to be precharged, and the voltage values at two ends of the flying capacitor Cfly need to be charged to be close to the pre-output voltage of the power conversion circuit, if the pre-charging is not carried out, the power switch is turned on, and an extremely large current exists in the instant circuit, so that all power devices in the circuit are burnt.
Referring to fig. 2, when the first signal received by the control module 23 is characterized in that the device is connected to the charge pump, the fifth switch tube Q9 is controlled to be turned on within the set period of time, and during this period of time, since the second end of the flying capacitor Cfly passes through the current limiting resistor RL1 and the fifth switch tube Q9 and is grounded in turn, the battery charges the flying capacitor Cfly through the body diode of the second switch tube Q2, so that the voltage value of the first end of the flying capacitor Cfly is the voltage value of the battery minus the voltage value of the voltage drop of the body diode, and the voltage value of the second end of the flying capacitor Cfly approaches the ground point, so that the voltage value of the two ends of the flying capacitor Cfly can be charged to be close to the pre-output voltage of the power conversion circuit (i.e. the voltage of the battery minus the voltage of the body diode drop) within the set period of time.
In an example, when the first signal received by the control module 23 is characterized as that the device is connected to the charge pump, an on signal pre_chg is output to the control terminal of the fifth switching tube Q9 to control the fifth switching tube Q9 to be turned on in the set period.
In a specific embodiment, the control module 23 is specifically configured to:
when the first signal is characterized in that equipment is connected to the charge pump, a high level is output to the control end of the fifth switching tube Q9 through the second end of the first signal in the set time period to control the fifth switching tube Q9 to be conducted, and a low level is output to the control end of the fifth switching tube Q9 through the second end of the first signal after the set time period is exceeded to control the fifth switching tube Q9 to be disconnected;
when the first signal is characterized in that the device is not connected to the charge pump, a low level is output to the control end of the fifth switching tube Q9 through the second end of the first signal so as to control the fifth switching tube Q9 to be disconnected.
In this case, in one example, the fifth switching transistor Q9 is an NMOS transistor or an NPN type BJT transistor. Of course, the present invention is not limited thereto, and PMOS transistors and the like may be selected, and accordingly, the control module 23 may be configured to: outputting a low level to the control end of the fifth switching tube Q9 through the second end of the fifth switching tube Q9 in the set time period so as to control the fifth switching tube Q9 to be conducted; after the set time is exceeded, outputting a high level to the control end of the fifth switching tube Q9 through the second end of the fifth switching tube Q9 so as to control the fifth switching tube Q9 to be disconnected; when the first signal is characterized in that the device is not connected to the charge pump, a high level is output to the control end of the fifth switching tube Q9 through the second end of the first signal so as to control the fifth switching tube Q9 to be disconnected. Other switching elements and the type of signal output by the control module 23 to control the fifth switching transistor Q9 can be selected by those skilled in the art as required.
In practical use, if the battery of the device is connected to the charge pump, due to the inductance, capacitance and other components of the electronic components, a high instantaneous voltage is generated in the system, which is much higher than the normal operating voltage. In order to avoid the charge pump being damaged by the transient high voltage, the charge pump can be allowed to work normally after the time of the possible transient high voltage, and in one embodiment, the control module 23 is further configured to set a spike-resistant duration; in this case, referring to fig. 3, the control module 23 includes a first timing unit 231 and a logic control unit 232; wherein:
the first timing unit 231 has a first end coupled to the first end of the insertion detection module 22, a second end coupled to a clock signal CLK, and a third end coupled to the first end of the logic control unit 232 to output a first time signal; a second terminal of the logic control unit 232 receives the clock signal CLK, and a third terminal thereof is coupled to the control terminal of the fifth switching tube Q9; wherein the first time signal comprises a first sub-signal and a second sub-signal;
wherein the first timing unit 231 is configured to: only when the first signal is characterized in that the device is connected to the charge pump, starting to count the connection time of the device, and outputting the first sub-signal to the first end of the logic control unit 232 after the anti-spike pulse duration; otherwise, outputting the second sub-signal to the first end of the logic control unit 232;
the logic control unit 232 is configured to: starting timing when the first end of the fifth switching tube Q9 receives the first sub-signal, outputting a high level to the control end of the fifth switching tube Q9 through the second end of the fifth switching tube Q9 in the set time period to control the fifth switching tube Q9 to be conducted, and outputting a low level to the control end of the fifth switching tube Q9 through the second end of the fifth switching tube Q9 after the set time period is exceeded to control the fifth switching tube Q9 to be disconnected;
when the first end receives the second sub-signal, the second end outputs a low level to the control end of the fifth switching tube Q9 so as to control the fifth switching tube Q9 to be disconnected.
In a preferred embodiment, referring to fig. 3, the fourth terminal of the logic control unit 232 receives the enable clock signal en_clk to set the set period, and the fifth terminal thereof receives the power-on reset signal POR.
The other modules of the precharge circuit are specifically described as follows:
in one embodiment, referring to fig. 3, the insertion detection module 22 includes a comparator;
the comparator has a non-inverting input coupled to the output of the charge pump, an inverting input receiving a reference voltage Vref, and an output coupled to the first terminal of the control module 23.
In this case, by comparing the voltage value of the voltage at the output terminal of the charge pump with the voltage value of the reference voltage Vref, it is possible to prevent the battery having a lower voltage from being connected to the charge pump while monitoring whether the battery of the device is connected to the charge pump, thereby causing the problem of damage to the device.
It should be understood that the specific components of the insertion detection module 22 are by way of example only, and in other examples, the voltage of the differential data line corresponding to the downstream port may also be monitored.
In one embodiment, referring to fig. 4, the protection module 21 includes a first capacitor C1 and a first resistor R1;
the first end of the first capacitor C1 and the first end of the first resistor R1 are both coupled to the output end of the charge pump, and the second end of the first capacitor C1 and the second end of the first resistor R1 are both grounded.
If the first capacitor C1 is a large capacitor, the low-frequency interference signal can be filtered; if the first capacitor C1 is a small capacitor, high-frequency interference signals can be filtered; and the on-resistance of the first resistor R1 is high.
In another embodiment, referring to fig. 3, the protection module 21 includes a second capacitor C2 and a sixth switching tube Q11;
the first end of the second capacitor C2 and the first end of the sixth switching tube are both coupled to the output end of the charge pump, the second end of the second capacitor C2 and the second end of the sixth switching tube Q11 are both grounded, and the control end of the sixth switching tube Q11 is coupled to the second end of the control module 23.
If the second capacitor C2 is a large capacitor, the low-frequency interference signal can be filtered; if the second capacitor C2 is a small capacitor, the high-frequency interference signal can be filtered. The sixth switching tube Q11 may be regarded as a switching tube having a weak pull-down function when turned on, and has a high on-resistance, so that the circuit can be protected,
in this case, in one embodiment, the control module 23 is further configured to:
when the first signal is characterized in that equipment is connected to the charge pump, the sixth switching tube Q11 is controlled to be conducted in the set time period, and is disconnected after the set time period is exceeded; and when the first signal is characterized in that the device is not connected to the charge pump, controlling the sixth switching tube Q11 to be disconnected.
Of course, the specific implementation of the protection circuit is not limited by the present invention, and any conceivable circuit structure is within the scope of the present invention, for example, a TVS diode is introduced, and the protection module 21 can be set by those skilled in the art as required.
In addition, the embodiment of the invention also provides electronic equipment, which comprises the charge pump pre-charging circuit, and the equipment can be a quick charging plug and a charging device, and can be other equipment needing to be powered.
In summary, the power transistor unit includes a first switch tube, a second switch tube, a third switch tube and a fourth switch tube electrically connected, the first switch tube is coupled to a power supply voltage, the first switch tube is further coupled to a bootstrap capacitor through a diode, the bootstrap capacitor is respectively coupled to the second switch tube and a flying capacitor, the flying capacitor is respectively coupled to the fourth switch tube and the precharge circuit, the fourth switch tube is further grounded, one end of the second switch tube is used as an output end of the power module, the first switch tube is further respectively coupled to an output end of the charge pump and an output capacitor, and the output capacitor is grounded; in the precharge circuit, a fifth switching tube is coupled to the flying capacitor through a current limiting resistor, and a protection module and an insertion detection module are both coupled to the output end of the charge pump; the protection module and a fifth switch tube are grounded; when the device is connected to the charge pump, the fifth switching tube is controlled to be conducted within a set time period, and the battery is used for charging the flying capacitor, so that a pre-charging circuit is simplified, and the charge pump can be pre-charged rapidly under the condition that whether the pre-charging is completed or not is confirmed by an external device.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims (11)

1. A charge pump pre-charge circuit for charging a battery of an accessed device, the charge pump comprising N power modules, each group of power modules comprising a power tube unit, a bootstrap capacitor and a flying capacitor, wherein N is a positive integer; wherein:
the power tube unit comprises a first switch tube, a second switch tube, a third switch tube and a fourth switch tube which are electrically connected in sequence, wherein the first end of the first switch tube is coupled to a power supply voltage, the first end of the first switch tube is also coupled to the first end of the bootstrap capacitor through a diode, the second end of the bootstrap capacitor is respectively coupled to the first end of the second switch tube and the first end of the flying capacitor, the second end of the flying capacitor is respectively coupled to the first end of the fourth switch tube and the first end of the precharge circuit, the second end of the fourth switch tube is grounded, the second end of the second switch tube is used as an output end of the power module, the second end of the second switch tube is respectively coupled to the output end of the charge pump and the first end of the output capacitor, and the negative electrode of the battery and the second end of the output capacitor are both grounded;
the precharge circuit comprises a protection module, an insertion detection module, a control module, a fifth switching tube and a current-limiting resistor; the first end of the fifth switch tube is coupled to the second end of the flying capacitor through the current limiting resistor, the second end of the fifth switch tube is grounded, the first end of the protection module and the first end of the insertion detection module are both coupled to the output end of the charge pump, the second end of the protection module is grounded, the second end of the insertion detection module is coupled to the first end of the control module, and the second end of the control module is coupled to the control end of the fifth switch tube; wherein:
the insertion detection module is used for monitoring the voltage of the first end of the insertion detection module in real time and outputting a first signal to the control module according to the detected voltage, wherein the first signal is used for representing whether equipment is connected to the charge pump or not;
the control module is configured to: setting a set time length, and controlling the fifth switching tube to be switched on in the set time length when the first signal is characterized in that equipment is connected to the charge pump, and switching off after the set time length is exceeded; and controlling the fifth switching tube to be opened when the first signal is characterized in that the device is not connected to the charge pump.
2. The charge pump precharge circuit of claim 1, wherein said first switch tube, said second switch tube, said third switch tube and said fourth switch tube are NMOS tubes or NPN BJT transistors.
3. The charge pump precharge circuit of claim 2, wherein said control module is specifically configured to:
when the first signal is characterized in that equipment is connected to the charge pump, a high level is output to the control end of the fifth switching tube through the second end of the first signal in the set time period so as to control the fifth switching tube to be conducted, and a low level is output to the control end of the fifth switching tube through the second end of the first signal after the set time period is exceeded so as to control the fifth switching tube to be disconnected;
when the first signal is characterized in that the equipment is not connected to the charge pump, a low level is output to the control end of the fifth switching tube through the second end of the first signal so as to control the fifth switching tube to be disconnected.
4. The charge pump precharge circuit of claim 3 wherein said control module is further configured to set a deglitch time period; the control module comprises a first timing unit and a logic control unit; wherein:
the first end of the first timing unit is coupled to the first end of the insertion detection module, the second end of the first timing unit is coupled to a clock signal, and the third end of the first timing unit is coupled to the first end of the logic control unit so as to output a first time signal; the second end of the logic control unit receives the clock signal, and the third end of the logic control unit is coupled to the control end of the fifth switching tube; wherein the first time signal comprises a first sub-signal and a second sub-signal;
wherein the first timing unit is configured to: only when the first signal is characterized in that the equipment is connected to the charge pump, starting to count the connection time of the equipment, and outputting the first sub-signal to the first end of the logic control unit after the anti-spike pulse duration; otherwise, outputting the second sub-signal to the first end of the logic control unit;
the logic control unit is configured to: starting timing when the first end of the fifth switching tube receives the first sub-signal, outputting a high level to the control end of the fifth switching tube through the second end of the fifth switching tube in the set time period so as to control the fifth switching tube to be conducted, and outputting a low level to the control end of the fifth switching tube through the second end of the fifth switching tube after the set time period is exceeded so as to control the fifth switching tube to be disconnected;
when the first end of the first sub-signal receives the second sub-signal, the second end of the first sub-signal outputs a low level to the control end of the fifth switching tube so as to control the fifth switching tube to be disconnected.
5. The charge pump precharge circuit of claim 4 wherein a fourth terminal of said logic control unit receives an enable clock signal to set said set period of time and a fifth terminal thereof receives a power-on reset signal.
6. The charge pump precharge circuit of claim 1 wherein said insertion detection module comprises a comparator;
the non-inverting input end of the comparator is coupled to the output end of the charge pump, the inverting input end of the comparator receives a reference voltage, and the output end of the comparator is coupled to the first end of the control module.
7. The charge pump precharge circuit of claim 1 wherein said protection module comprises a first capacitor and a first resistor;
the first end of the first capacitor and the first end of the first resistor are coupled to the output end of the charge pump, and the second end of the first capacitor and the second end of the first resistor are grounded.
8. The charge pump precharge circuit of claim 1, wherein said protection module comprises a second capacitor and a sixth switching tube;
the first end of the second capacitor and the first end of the sixth switching tube are both coupled to the output end of the charge pump, the second end of the second capacitor and the second end of the sixth switching tube are both grounded, and the control end of the sixth switching tube is coupled to the second end of the control module.
9. The charge pump precharge circuit of claim 8 wherein said control module is further configured to:
when the first signal is characterized in that equipment is connected to the charge pump, the sixth switching tube is controlled to be connected in the set time period, and is disconnected after the set time period is exceeded; and controlling the sixth switching tube to be opened when the first signal is characterized in that the device is not connected to the charge pump.
10. The charge pump precharge circuit of any of claims 1-9, wherein said charge pump is a half-voltage power conversion circuit.
11. An electronic device comprising the charge pump precharge circuit of any of claims 1-10.
CN202310927841.6A 2023-07-26 2023-07-26 Charge pump precharge circuit and electronic device Pending CN116865556A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310927841.6A CN116865556A (en) 2023-07-26 2023-07-26 Charge pump precharge circuit and electronic device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310927841.6A CN116865556A (en) 2023-07-26 2023-07-26 Charge pump precharge circuit and electronic device

Publications (1)

Publication Number Publication Date
CN116865556A true CN116865556A (en) 2023-10-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310927841.6A Pending CN116865556A (en) 2023-07-26 2023-07-26 Charge pump precharge circuit and electronic device

Country Status (1)

Country Link
CN (1) CN116865556A (en)

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