CN220473673U - Charge pump fault detection circuit, charging plug, charging system and electronic equipment - Google Patents

Abstract

The utility model provides a charge pump fault detection circuit, a charging plug, a charging system and electronic equipment, wherein the fault detection circuit is simpler, a first input end and a first resistor of a first comparator are coupled with one end of a corresponding bootstrap capacitor, a second input end and a first switch are coupled with the other end of the corresponding bootstrap capacitor, and the first resistor is also coupled with the first switch; the first input end and the second resistor of the second comparator are both coupled with one end of the corresponding flying capacitor, the second input end and the second switch of the second comparator are both coupled with the other end of the corresponding flying capacitor, the second resistor is also coupled with the second switch, and the output ends of the first comparator and the second comparator are both coupled with the third detection module. After the charge pump is in soft start, only N first switches and N second switches are required to be simultaneously closed in a first time period, and N first switches and N second switches are required to be opened in a second time period, so that the charge pump is subjected to fault elimination in a short time period.

Description

Charge pump fault detection circuit, charging plug, charging system and electronic equipment

Technical Field

The present utility model relates to the field of power electronics, and in particular, to a charge pump fault detection circuit, a charging plug, a charging system, 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 applications, before starting to work, the power conversion circuit needs to exclude the open/short circuit state of the capacitor pin before starting the charge pump power switch, and after passing the open/short circuit detection of the capacitor, the power conversion circuit starts the subsequent working instruction, so that fault detection needs to be performed on the flying capacitor and the bootstrap capacitor.

In the prior architecture, the flying capacitor and the bootstrap capacitor are subjected to open-circuit detection by using serial time sequence, in the example shown in fig. 1, the flying capacitor or the bootstrap capacitor is subjected to short-circuit detection at one end of a power tube unit, namely, one end of the capacitor is pulled down by current, whether potentials at two ends of the capacitor form a certain potential difference is compared, if no potential difference is the flying capacitor or the bootstrap capacitor, the flying capacitor or the bootstrap capacitor is subjected to open-circuit detection, S1 or S2 is closed in a shorter time, if the potential difference at two ends of the flying capacitor or the bootstrap capacitor is detected to be smaller, the flying capacitor or the bootstrap capacitor in the circuit is subjected to open-circuit, and if the detection is passed, the circuit is in a normal state, however, the time required by the mode is longer, and the circuit implementation is more complicated.

Therefore, how to perform the fault removal on the charge pump in a short time and simplify the circuit has become a technical problem that needs to be solved in the industry.

Disclosure of Invention

The utility model provides a charge pump fault detection circuit, a charging plug, a charging system and electronic equipment, which are used for solving the problems of how to perform fault elimination on a charge pump in a short time and simplifying a circuit.

According to a first aspect of the present utility model, there is provided a charge pump fault detection circuit, 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 first capacitor, and both the negative electrode of the battery and the second end of the first capacitor are grounded;

the fault detection circuit comprises N first detection modules, N second detection modules, a control module and a third detection module, wherein each first detection module comprises a first comparator, a first resistor and a first switch, and each second detection module comprises a second comparator, a second resistor and a second switch; wherein:

the first input end of the first comparator and the first end of the first resistor are both coupled to the first end of the bootstrap capacitor in the corresponding power module, the second input end of the first comparator and the first end of the first switch are both coupled to the second end of the bootstrap capacitor in the corresponding power module, the second end of the first resistor is coupled to the second end of the first switch, the control module is coupled to the control end of the first switch, and the output end of the first comparator is coupled to the third detection module;

the first input end of the second comparator and the first end of the second resistor are both coupled to the first end of the flying capacitor in the corresponding power module, the second input end of the second comparator and the first end of the second switch are both coupled to the second end of the flying capacitor in the corresponding power module, the second end of the second resistor is coupled to the second end of the second switch, the control module is coupled to the control end of the second switch, and the output end of the second comparator is coupled to the third detection module;

and the control module and the third detection module both receive a clock signal.

Optionally, the control module is configured to:

after the charge pump is in soft start, simultaneously closing N first switches and N second switches in the fault detection circuit in a first time period, and opening N first switches and N second switches in the fault detection circuit in a second time period;

the third detection module is configured to:

and judging the working state of the charge pump according to the signals output by the N first comparators and the signals output by the N second comparators in the first time period.

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 third detection module includes N first type triggers, N second type triggers and a logic control module;

the first ends of the N first-type triggers and the first ends of the N second-type triggers all receive the clock signals; the second end of each first type trigger is coupled to the output end of the corresponding first comparator, and the output end of each first type trigger is coupled to the logic control module; the second end of each second type trigger is coupled to the output end of the corresponding second comparator, and the output end of each second type trigger is coupled to the logic control module; the clock input end of the logic control module receives the clock signal, and the output end of the logic control module is used for outputting a judging signal, wherein the judging signal represents the working state of the charge pump; wherein:

the first type of flip-flop and the second type of flip-flop are each configured to: receiving a signal currently input by a first end of the clock signal when the clock signal hops along a first edge; outputting a signal currently input by the first end of the clock signal when the clock signal hops along the second edge;

the logic control module is configured to: and judging the working state of the charge pump according to the signals of the output ends of the N first-type triggers and the N second-type triggers, wherein the charge pump is judged to be in a normal state only when the signals of the output ends of the N first-type triggers and the N second-type triggers are in the first level, otherwise, the charge pump is in a fault state.

Optionally, the logic control module is further configured to: and judging the working state of the charge pump according to the signals of the output ends of the N first-type triggers and the N second-type triggers, wherein the charge pump is judged to be in a normal state only when the signals of the output ends of the N first-type triggers and the N second-type triggers are in a first level, otherwise, the corresponding power module with open circuit or short circuit is output.

Optionally, the charge pump further comprises a power tube control module;

the input end of the power tube control module receives the judging signal, and the output end of the power tube control module is respectively coupled to N first switching tubes, N second switching tubes, N third switching tubes and N fourth switching tubes; the power tube control module is used for controlling whether the charge pump works normally or not according to the judging signal, wherein the power tube control module controls the charge pump to work normally only when the judging signal is characterized in that the charge pump works normally; otherwise, the N first switching tubes, the N second switching tubes, the N third switching tubes and the N fourth switching tubes are controlled to be disconnected.

Optionally, the first type flip-flop and the second type flip-flop are both D flip-flops.

Optionally, the charge pump is a half-voltage power conversion circuit.

According to a second aspect of the present utility model there is provided a charging plug comprising the charge pump precharge circuit of any one of the first aspects of the present utility model.

According to a third aspect of the present utility model there is provided a charging system comprising a charging plug provided in any one of the second aspects of the present utility model.

According to a fourth aspect of the present utility model there is provided an electronic device comprising the charge pump precharge circuit of any of the first aspects of the present utility model.

In the charge pump fault detection circuit, the charging plug, the charging system and the electronic equipment provided by the utility model, the fault detection circuit is simpler, wherein the first input end of the first comparator and the first resistor are both coupled with one end of the corresponding bootstrap capacitor, the second input end of the first comparator and the first end of the first switch are both coupled with the other end of the corresponding bootstrap capacitor, and the first resistor is also coupled with the second end of the first switch; the first input end of the second comparator and the second resistor are both coupled with one end of the corresponding flying capacitor, the second input end of the second comparator and the first end of the second switch are both coupled with the other end of the corresponding flying capacitor, the second resistor is also coupled with the second end of the second switch, the output ends of the first comparator and the second comparator are coupled with the third detection module, and the fault detection circuit is simpler. After the charge pump is in soft start, the charge pump can be subjected to fault elimination in a short time by only closing the N first switches and the N second switches in a first time period and opening the N first switches and the N second switches in a second time period.

Drawings

In order to more clearly illustrate the embodiments of the utility model 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 utility model, 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 failure detection circuit configuration of the present utility model;

FIG. 2 is a schematic diagram of a charge pump failure detection circuit according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram of a charge pump failure detection circuit according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram of a charge pump failure detection circuit according to another embodiment of the present utility model;

FIG. 5 is a flow chart of a charge pump detection method according to an embodiment of the utility model

Reference numerals illustrate:

11-a power tube unit;

12-a power tube control module;

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;

PMID-supply voltage;

c1-a first capacitance;

211-a first comparator;

r1-a first resistor;

SW 1-a first switch;

221-a second comparator;

r2-a second resistor;

SW 2-a second switch;

a CLK-clock signal;

231-first class flip-flops;

232-a second type trigger;

233-logic control module;

24-control module.

Detailed Description

The following description of the embodiments of the present utility model 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 utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

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 utility model 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 utility model 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 perform troubleshooting of a charge pump in a short time and simplify a circuit. The utility model provides a charge pump fault detection circuit, a charging plug, a charging system and electronic equipment, wherein the fault detection circuit is simpler, a first input end of a first comparator and a first resistor are both coupled with one end of a corresponding bootstrap capacitor, a second input end of the first comparator and a first end of a first switch are both coupled with the other end of the corresponding bootstrap capacitor, and the first resistor is also coupled with a second end of the first switch; the first input end of the second comparator and the second resistor are both coupled with one end of the corresponding flying capacitor, the second input end of the second comparator and the first end of the second switch are both coupled with the other end of the corresponding flying capacitor, the second resistor is also coupled with the second end of the second switch, the output ends of the first comparator and the second comparator are coupled with the third detection module, and the fault detection circuit is simpler. After the charge pump is in soft start, the charge pump can be subjected to fault elimination in a short time by only closing the N first switches and the N second switches in a first time period and opening the N first switches and the N second switches in a second time period.

Referring to fig. 2, an embodiment of the present utility model provides a charge pump fault detection circuit, where the charge pump includes N power modules, each group of power modules includes a power tube unit 11, a bootstrap capacitor Cboot, and a flying capacitor Cfly, where N is a positive integer; wherein:

the charge pump is used for charging a battery BAT of an accessed device, taking a power tube unit at the left in fig. 2 as an example, the power tube unit 11 comprises a first switch tube Q1, a second switch tube Q2, a third switch tube Q3 and a fourth switch tube Q4 which are electrically connected in sequence, a first end of the first switch tube Q1 is coupled to a power 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 respectively 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 respectively coupled to a first end of the fourth switch tube Q4 and a first end of the 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 bootstrap capacitor Cboot, and the second end of the bootstrap capacitor Cboot is respectively coupled to a first end of the battery charge pump, and the charge pump is connected to the first end of the battery charge pump;

the fault detection circuit includes N first detection modules 21, N second detection modules 22, a control module 24 (shown in fig. 4), and a third detection module (shown in fig. 3), where in the power tube unit on the left in fig. 2, the first detection modules 21 each include a first comparator 211, a first resistor R1, and a first switch SW1, and the second detection modules 22 each include a second comparator 221, a second resistor R2, and a second switch SW2; wherein:

the first input terminal of the first comparator 211 and the first terminal of the first resistor R1 are both coupled to the first terminal of the bootstrap capacitor Cboot1 in the corresponding power module, the second input terminal of the first comparator 211 and the first terminal of the first switch SW1 are both coupled to the second terminal of the bootstrap capacitor Cboot1 in the corresponding power module, the second terminal of the first resistor R1 is coupled to the second terminal of the first switch SW1, the control module 24 is coupled to the control terminal of the first switch SW1, and the output terminal OUT1 of the first comparator 211 is coupled to the third detection module;

the first input terminal of the second comparator 221 and the first terminal of the second resistor R2 are both coupled to the first terminal of the flying capacitor Cfly1 in the corresponding power module, the second input terminal of the second comparator 221 and the first terminal of the second switch SW2 are both coupled to the second terminal of the flying capacitor Cfly1 in the corresponding power module, the second terminal of the second resistor R2 is coupled to the second terminal of the second switch SW2, the control module 24 is coupled to the control terminal of the second switch SW2, and the output terminal OUT2 of the second comparator 221 is coupled to the third detection module;

and the control module 24 and the third detection module both receive a clock signal CLK; wherein:

the control module 24 is configured to:

after the charge pump is started in a soft mode, N first switches SW1 and N second switches SW2 in the fault detection circuit are simultaneously closed in a first time period, and N first switches SW1 and N second switches SW2 in the fault detection circuit are opened in a second time period;

the third detection module is configured to:

the working state of the charge pump is determined according to the signals output by the N first comparators 211 and the signals output by the N second comparators 221 in the first period.

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.

Similarly, in the right power tube unit in fig. 2, the first detection module 21 includes a first comparator 211, a third resistor R3, and a third switch SW3, and the second detection module 22 includes a second comparator 221, a fourth resistor R2, and a fourth switch SW4. The connection mode is similar to that of the left power tube unit 11, the third switch SW3 may be considered as one of the N first switches in the fault detection circuit, the fourth switch SW4 may be considered as one of the N second switches in the fault detection circuit, and the operation mode is also similar to that of the left power tube unit 11, and is omitted for brevity.

The control module 24 is coupled to the control end of the first switch corresponding to each first detection module 21 and the control end of the second switch corresponding to each second detection module 22, respectively, so as to control on/off of the N first switches and the N second switches (not shown in the figure).

In an example, the first switch SW1 and the second switch SW2 are NMOS switches, and the control module 24 outputs a high level signal for a first period of time after the soft start of the charge pump, so as to simultaneously close N first switches and N second switches in the fault detection circuit, and outputs a low level signal for a second period of time, so as to open N first switches and N second switches in the fault detection circuit. Of course, the present utility model is not limited thereto, and PMOS switches, BJT transistors, etc. may be used as the elements of the first switch SW1 or the second switch SW2, and those skilled in the art may select appropriate components according to the needs.

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.

Before the half-voltage power conversion circuit works normally, the bootstrap capacitor Cboot and the flying capacitor Cfly in each power module need to be detected so as to prevent the power supply voltage PMID from being reduced normally.

Specifically, after the soft start of the charge pump, the control module 24 simultaneously closes the N first switches SW1 and the N second switches SW2 in the fault detection circuit for a first period of time to start detecting the bootstrap capacitor Cboot and the flying capacitor Cfly of each module, and in the example shown in fig. 2, the control module 24 simultaneously closes the first switch SW1, the second switch SW2, the third switch SW3 and the fourth switch SW4 in the fault detection circuit for the first period of time, wherein the first input end of the first comparator 211 is a non-inverting input end, and the second input end thereof is an inverting input end; the first input terminal of the second comparator 221 is a non-inverting input terminal, and the second input terminal thereof is an inverting input terminal, in this case, the operation of the fault detection circuit will be described by taking the left power tube unit 11 as an example, where:

if the bootstrap capacitor Cboot1 and/or the flying capacitor Cfly1 have a short circuit, the electric potentials of the two input ends of the first comparator 211 and/or the second comparator 221 are the same, and the output end OUT1 of the first comparator 211 and/or the output end OUT2 of the second comparator 221 will output a low-level signal;

if the bootstrap capacitor Cboot1 and/or the flying capacitor Cfly1 is opened, before the first switch SW1 and the second switch SW2 are closed, a potential difference exists between the potentials of the two input ends of the bootstrap capacitor Cboot1 and/or the flying capacitor Cfly1, and after the first switch SW1 and the second switch SW2 are controlled to be closed in a first period of time, the potentials of the two ends of the bootstrap capacitor Cboot1 and/or the flying capacitor Cfly1 are the same, and the output end OUT1 of the first comparator 211 and/or the output end OUT2 of the second comparator 221 output a low-level signal;

if both the bootstrap capacitor Cboot1 and the flying capacitor Cfly1 are in a normal working state, after the charge pump is precharged (i.e., after the charge pump is started up), the potentials at both ends of the bootstrap capacitor Cboot1 and the potentials at both ends of the flying capacitor Cfly1 have potential differences, and even if the first switch SW1 and the second switch SW2 are controlled to be closed in a first period of time, the potentials at both ends of the bootstrap capacitor Cboot1 and the potential differences at both ends of the flying capacitor Cfly1 are basically unchanged, and the output end OUT1 of the first comparator 211 and/or the output end OUT2 of the second comparator 221 will output a high-level signal.

Similarly, in the right power tube unit 11, only when the bootstrap capacitor Cboot2 and the flying capacitor Cfly2 are both in the normal working state, the output terminal OUT3 of the first comparator 211 and/or the output terminal OUT4 of the second comparator 221 both output a high level, which is not described herein for brevity.

The third detection module determines the working state of the charge pump according to the signals output by the N first comparators 211 and the signals output by the N second comparators 221 in the first duration. In the example shown in fig. 2, the third detection module determines that the charge pump can normally operate only when the signals output by the two first comparators 211 and the two second comparators 221 output high levels.

In a specific embodiment, referring to fig. 3, the third detection module includes N first type triggers 231, N second type triggers 232, and a logic control module 233;

the first ends of the N first type flip-flops 231 and the first ends of the N second type flip-flops 232 each receive the clock signal CLK; a second terminal of each first type flip-flop 231 is coupled to an output terminal of the corresponding first comparator 211, and an output terminal of each first type flip-flop 231 is coupled to the logic control module 233; a second end of each second type flip-flop 232 is coupled to an output end of the corresponding second comparator 221, and an output end of each second type flip-flop 232 is coupled to the logic control module 233; the clock input end of the logic control module 233 receives the clock signal CLK, and the output end thereof is used for outputting a judging signal, wherein the judging signal characterizes the working state of the charge pump; wherein:

the first type flip-flop 231 and the second type flip-flop 232 are each configured to: receiving a signal currently input by a first end of the clock signal CLK at a first jump edge of the clock signal CLK; outputting a signal currently input by the first end of the clock signal CLK at the second jump edge of the clock signal CLK;

the logic control module 233 is configured to: and judging the working state of the charge pump according to the signals of the output ends of the N first-type triggers 231 and the N second-type triggers 232, wherein the charge pump is judged to be in a normal state only when the signals of the output ends of the N first-type triggers 231 and the N second-type triggers 232 are in the first level, otherwise, the charge pump is in a fault state.

In a preferred embodiment, the logic control module 233 may also locate the power tube unit 11 where there is a short circuit or open circuit, in which case the logic control module 233 is further configured to: and judging the working state of the charge pump according to the signals of the output ends of the N first type triggers 231 and the N second type triggers 232, wherein the charge pump is judged to be in a normal state only when the signals of the output ends of the N first type triggers 231 and the N second type triggers 232 are at the first level, otherwise, the corresponding power tube unit 11 with open circuit or short circuit is output.

In one example, referring to fig. 3, the first type flip-flop 231 and the second type flip-flop 232 are D flip-flops. In a specific embodiment, the CLK terminals of the N flip-flops 231 of the first type and the CLK terminals of the N flip-flops 232 of the second type each receive the clock signal CLK; the D terminal of each first type flip-flop 231 is coupled to the output terminal of the corresponding first comparator 211, and the Q terminal of each first type flip-flop 231 is coupled to the logic control module 233; the D terminal of each second type flip-flop 232 is coupled to the output terminal of the corresponding second comparator 221, and the Q terminal of each second type flip-flop 232 is coupled to the logic control module 233.

In this case, a further explanation will be made by taking, as an example, a first type of flip-flop 231 corresponding to the power tube unit 11 on the left in fig. 2:

if the output terminal OUT1 of the first comparator 211 to which the D terminal of the first type flip-flop 231 is coupled continuously outputs the low level signal for the first period of time, when the clock signal CLK is the low level signal (i.e., the second skip edge), the D latch of the first stage inside the D flip-flop outputs the low level signal, and the SR storage of the second stage is in the hold state; when the clock signal CLK is a high level signal (i.e., a first jump edge), the D latch of the first stage inside the D flip-flop is in a hold state, and the SR storage of the second stage outputs a low level signal; therefore, the logic control module 233 continuously receives the low level signal during the first period, so as to determine that the power tube unit 11 corresponding to the first type of flip-flop 231 cannot work normally.

If the bootstrap capacitor Cboot1 corresponding to the first type flip-flop 231 is open, at the closing moment of the corresponding first switch SW1, the output end of the first comparator 211 outputs a high-level signal, the first type flip-flop 231 outputs a high-level signal, and at the same time, the output end of the first comparator 211 outputs a low-level signal when the two ends of the bootstrap capacitor Cboot1 are in the same phase, at this time, if the clock signal CLK is a high-level signal (i.e., a first jump edge), the D latch of the first stage inside the D flip-flop is in a hold state, the second stage SR storage still outputs a high-level signal, and when the clock signal CLK is a low-level signal (i.e., a second jump edge), the D latch of the first stage inside the D flip-flop outputs a low-level signal, and the second stage SR storage is in a hold state; when the clock signal CLK is a high level signal (i.e., the first trip edge) again, the D latch of the first stage inside the D flip-flop is in a hold state, and the SR storage of the second stage outputs a low level signal, so that the logic control module 233 can determine that the bootstrap capacitor Cboot corresponding to the first type flip-flop 231 cannot work normally in the first period.

Similarly, the second type flip-flop 232 may correspondingly output a high level signal or a low level signal according to the signal at the output end of the corresponding second comparator 221, so that the logic control module 233 may determine that the flying capacitor Cfly corresponding to the second type flip-flop 232 cannot work normally in the first duration.

In summary, the third detection module may perform synchronous detection on the working states of the power tube units 11 within the first duration, thereby accelerating the detection speed and reducing the complexity of the detection system and the chip area.

Of course, the utility model is not limited to the specific type of flip-flop, but may be a J-K flip-flop, etc., and those skilled in the art may select appropriate elements as desired.

Because the N power tube units 11 in the half-voltage power conversion circuit can only perform corresponding operations under the condition that each power tube unit 11 can normally operate, in one embodiment, referring to fig. 4, the charge pump further includes a power tube control module 12;

the input end of the power tube control module 12 receives the judging signal, and the output ends thereof are respectively coupled to N first switching tubes Q1, N second switching tubes Q2, N third switching tubes Q3 and N fourth switching tubes Q4 (in the example of fig. 4, the number of the power tube units 11 is 1); the power tube control module 12 is configured to control whether the charge pump is operating normally according to the determination signal, where the power tube control module 12 controls the charge pump to operate normally only when the determination signal indicates that the charge pump is operating normally; otherwise, the N first switching transistors Q1, the N second switching transistors Q2, the N third switching transistors Q3, and the N fourth switching transistors Q4 are all controlled to be turned off.

Specifically, in the case that the half-voltage power conversion circuit works normally, the power tube unit 11 shown in fig. 4 is taken as an example, and the control ends of the first switch tube Q1, the second switch tube Q2, the third switch tube Q3, and the fourth switch tube Q4 respectively receive the first control signal CHG1, the second control signal DHG1, the third control signal CLG1, and the fourth control signal DLG1 output by the power tube control module 12; 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 CLKCLK 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 Cfly1 and the first capacitor C1 are connected in series and divided, in this case:

Vcfly1+Vc1＝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 Cfly1 and the first capacitor C1 are connected in parallel, in this case:

Vcfly1＝Vc1；

wherein Vcfly1 is the voltage value of the flying capacitor Cfly1, vc1 is the voltage value of the first capacitor C1, and VIN is the voltage value of the second end of the bootstrap capacitor Cboot 1.

In summary, the voltage value vc1=vin/2 of the first capacitor C1, so as to achieve the voltage-reducing effect; and according to the principle of conservation of power, the current iout=2×ivin flowing into the battery; wherein Ivin is a current value flowing through the second end of the bootstrap capacitor Cboot.

In addition, the embodiment of the utility model also provides a charge pump detection method, which uses the charge pump fault detection circuit described in fig. 2, 3 and 4 to perform open-short circuit detection on the charge pump, and the method comprises the following steps:

after the charge pump is started in a soft mode, N first switches SW1 and N second switches SW2 in the fault detection circuit are simultaneously closed in a first time period, and N first switches SW1 and N second switches SW2 in the fault detection circuit are opened in a second time period;

the working state of the charge pump is determined according to the signals output by the N first comparators 211 and the signals output by the N second comparators 221 in the first period.

As a specific implementation manner, please refer to fig. 5, in actual use, the control of the single-chip microcomputer key circuit shown in fig. 2 and 3 provided by the embodiment of the present utility model includes the following steps:

s31: powering up;

s32: judging whether a device is connected to a charge pump; if yes, go to S33; otherwise, returning to S32;

s33: soft starting the charge pump;

specifically, the flying capacitor Cfly of each power module is charged, so that the voltage of the flying capacitor Cfly of each power module is close to the voltage of the battery of the device coupled with the output end of the charge pump;

s34: simultaneously closing N first switches SW1 and N second switches SW2 in the fault detection circuit in a first duration;

s35: judging the working state of the charge pump according to the signals output by the N first comparators 211 and the signals output by the N second comparators 221, and if the charge pump is in a normal state, entering S36;

otherwise, enter S37;

specifically, only when the signals at the output ends of the N first type flip-flops 231 and the N second type flip-flops 232 are all at the first level, the charge pump is judged to be in a normal state, and S36 is entered;

otherwise, it is determined that the charge pump has a fault, and the process proceeds to S37.

S36: switching off N first switches SW1 and N second switches SW2 in the fault detection circuit, allowing the charge pump to work normally, and returning to S32;

s37: the N first switches SW1 and the N second switches SW2 in the fault detection circuit are turned off, the charge pump is disabled, and S32 is returned.

In addition, the embodiment of the utility model also provides a charging plug which comprises the charge pump precharge circuit. By way of example, the charging plug may be a quick-charge plug or the like, but may be other charging plugs.

In addition, the embodiment of the utility model also provides a charging system which comprises the charging plug. As an example, the charging system may be a mobile phone charging system, an automobile charging system, etc., and of course, may be other charging systems.

In addition, the embodiment of the utility model also provides electronic equipment, which comprises the charge pump precharge circuit. For example, the electronic device may be a charging pile, a charging device, or the like, and may be any other electronic device that needs to be charged.

In summary, the fault detection circuit of the present utility model is simple, wherein the first input terminal of the first comparator and the first resistor are both coupled to one end of the corresponding bootstrap capacitor, the second input terminal of the first comparator and the first terminal of the first switch are both coupled to the other end of the corresponding bootstrap capacitor, and the first resistor is also coupled to the second terminal of the first switch; the first input end of the second comparator and the second resistor are both coupled with one end of the corresponding flying capacitor, the second input end of the second comparator and the first end of the second switch are both coupled with the other end of the corresponding flying capacitor, the second resistor is also coupled with the second end of the second switch, the output ends of the first comparator and the second comparator are coupled with the third detection module, and the fault detection circuit is simpler. After the charge pump is in soft start, the charge pump can be subjected to fault elimination in a short time by only closing the N first switches and the N second switches in a first time period and opening the N first switches and the N second switches in a second time period.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model 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 utility model.

Claims (11)

1. The charge pump fault detection circuit is characterized by comprising N power modules, wherein each group of power modules comprises a power tube unit, a bootstrap capacitor and a flying capacitor, and 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, and is respectively coupled to the output end of the charge pump, the first end of the first capacitor, the negative electrode of the battery and the second end of the first capacitor are all grounded;

the fault detection circuit comprises N first detection modules, N second detection modules, a control module and a third detection module, wherein each first detection module comprises a first comparator, a first resistor and a first switch, and each second detection module comprises a second comparator, a second resistor and a second switch; wherein:

the first input end of the first comparator and the first end of the first resistor are both coupled to the first end of the bootstrap capacitor in the corresponding power module, the second input end of the first comparator and the first end of the first switch are both coupled to the second end of the bootstrap capacitor in the corresponding power module, the second end of the first resistor is coupled to the second end of the first switch, the control module is coupled to the control end of the first switch, and the output end of the first comparator is coupled to the third detection module;

the first input end of the second comparator and the first end of the second resistor are both coupled to the first end of the flying capacitor in the corresponding power module, the second input end of the second comparator and the first end of the second switch are both coupled to the second end of the flying capacitor in the corresponding power module, the second end of the second resistor is coupled to the second end of the second switch, the control module is coupled to the control end of the second switch, and the output end of the second comparator is coupled to the third detection module;

and the control module and the third detection module both receive a clock signal.

2. The charge pump failure detection circuit of claim 1, wherein,

the control module is configured to:

after the charge pump is in soft start, simultaneously closing N first switches and N second switches in the fault detection circuit in a first time period, and opening N first switches and N second switches in the fault detection circuit in a second time period;

the third detection module is configured to:

and judging the working state of the charge pump according to the signals output by the N first comparators and the signals output by the N second comparators in the first time period.

3. The charge pump failure detection circuit of claim 1 or 2, wherein the first, second, third, and fourth switching transistors are NMOS transistors or NPN BJT transistors.

4. The charge pump failure detection circuit of claim 3, wherein the third detection module includes N flip-flops of a first type, N flip-flops of a second type, and a logic control module;

the first ends of the N first-type triggers and the first ends of the N second-type triggers all receive the clock signals; the second end of each first type trigger is coupled to the output end of the corresponding first comparator, and the output end of each first type trigger is coupled to the logic control module; the second end of each second type trigger is coupled to the output end of the corresponding second comparator, and the output end of each second type trigger is coupled to the logic control module; the clock input end of the logic control module receives the clock signal, and the output end of the logic control module is used for outputting a judging signal, wherein the judging signal represents the working state of the charge pump; wherein:

the first type of flip-flop and the second type of flip-flop are each configured to: receiving a signal currently input by a first end of the clock signal when the clock signal hops along a first edge; outputting a signal currently input by the first end of the clock signal when the clock signal hops along the second edge;

the logic control module is configured to: and judging the working state of the charge pump according to the signals of the output ends of the N first-type triggers and the N second-type triggers, wherein the charge pump is judged to be in a normal state only when the signals of the output ends of the N first-type triggers and the N second-type triggers are in the first level, otherwise, the charge pump is in a fault state.

5. The charge pump failure detection circuit of claim 4, wherein the logic control module is further configured to: and judging the working state of the charge pump according to the signals of the output ends of the N first-type triggers and the N second-type triggers, wherein the charge pump is judged to be in a normal state only when the signals of the output ends of the N first-type triggers and the N second-type triggers are in a first level, otherwise, the corresponding power module with open circuit or short circuit is output.

6. The charge pump failure detection circuit of any of claims 4-5, wherein the charge pump further comprises a power tube control module;

the input end of the power tube control module receives the judging signal, and the output end of the power tube control module is respectively coupled to N first switching tubes, N second switching tubes, N third switching tubes and N fourth switching tubes; the power tube control module is used for controlling whether the charge pump works normally or not according to the judging signal, wherein the power tube control module controls the charge pump to work normally only when the judging signal is characterized in that the charge pump works normally; otherwise, the N first switching tubes, the N second switching tubes, the N third switching tubes and the N fourth switching tubes are controlled to be disconnected.

7. The charge pump failure detection circuit of claim 4, wherein the first type of flip-flop and the second type of flip-flop are both D flip-flops.

8. The charge pump failure detection circuit of claim 1, wherein the charge pump is a half-voltage power conversion circuit.

9. A charging plug comprising the charge pump failure detection circuit of any one of claims 1-8.

10. A charging system comprising a device and the charging plug of claim 9.

11. An electronic device comprising the charge pump failure detection circuit of any of claims 1-8.