CN111817409A

CN111817409A - Fast charging protection circuit and method, fast charging chip and fast charging power supply equipment

Info

Publication number: CN111817409A
Application number: CN202010956311.0A
Authority: CN
Inventors: 戴加良
Original assignee: Shenzhen Injoinic Technology Co Ltd
Current assignee: Shenzhen Injoinic Technology Co Ltd
Priority date: 2020-09-11
Filing date: 2020-09-11
Publication date: 2020-10-23
Anticipated expiration: 2040-09-11
Also published as: CN114172223A; CN111817409B; CN114172224A

Abstract

The application provides a quick charge protection circuit and method, a quick charge chip and quick charge power supply equipment. The quick charge protection circuit comprises a voltage conversion module, a quick charge control module and a plug detection module. And the quick charge control module controls the voltage conversion module to output corresponding quick charge voltage according to a quick charge protocol signal of the external equipment. The plug detection module outputs a plug signal when detecting that the quick-charging protocol signal disappears, wherein the quick-charging protocol signal disappears when the external device begins to be plugged out. The quick charging control module controls the voltage conversion module to reduce the output voltage to a preset voltage according to the pulling signal. The time required from the detection of the disappearance of the rapid charging protocol signal to the start of the reduction of the output voltage is less than the time required from the start of the pulling out of the external device to the complete pulling out of the external device, so that the pulling out action of the external device can be detected in advance, the output voltage can be reduced before the external device is completely pulled out, and the overshoot amplitude of the output voltage can be effectively reduced.

Description

Fast charging protection circuit and method, fast charging chip and fast charging power supply equipment

Technical Field

The application relates to the technical field of charging, in particular to a quick-charging protection circuit and method, a quick-charging chip and quick-charging power supply equipment with the quick-charging protection circuit or the quick-charging chip.

Background

In recent years, with the development of the quick charging technology, various quick charging technologies are more and more widely applied. When the mobile terminal is charged quickly, for example, a mobile phone, a tablet computer, and the like, a quick charging voltage is applied to a quick charging power supply device with a quick charging chip, for example, a quick charging mobile power supply or a quick charging adapter, through a quick charging protocol, so as to shorten the charging time of the mobile terminal. Taking a fast charging mobile power supply with a fast charging chip as an example, the current fast charging mobile power supply can output voltages of different voltage gears such as 9V, 12V, 15V and the like according to a fast charging protocol. For example, the QC protocol 2.0 may apply to voltages of 9V or 12V, and the PD protocol may apply to voltages of 9V, 12V, or 15V. When the mobile terminal is charged by using the fast charging mobile power supply, if the mobile terminal is suddenly pulled out in the middle of the fast charging process, overshoot of output voltage can be caused due to the transient response characteristic of the power supply of the fast charging mobile power supply. If the overshoot voltage amplitude is too large, certain influence is brought to the safety of the fast charging mobile power supply, and the fast charging mobile power supply can be seriously damaged.

Disclosure of Invention

The application provides a fast charging protection circuit and method, a fast charging chip and a fast charging power supply device, which can quickly detect the pulling-out action of an external device in advance aiming at the condition that the external device is pulled out suddenly in the fast charging process, and reduce the output voltage in advance before the external device is completely pulled out, thereby effectively reducing the overshoot amplitude of the output voltage and improving the safety of the fast charging power supply device, such as a fast charging mobile power supply or a fast charging adapter.

The first aspect of the present application provides a fast charging protection circuit, the fast charging protection circuit includes a USB interface, a voltage conversion module, a fast charging control module, and a plug detection module. The USB interface is used for being electrically connected with external equipment. The voltage conversion module is electrically connected with the USB interface. The quick charging control module is electrically connected with the voltage conversion module and the USB interface respectively, and is used for acquiring a quick charging protocol signal of the external equipment through the USB interface, identifying a quick charging voltage request of the external equipment according to the quick charging protocol signal, and controlling the voltage conversion module to output corresponding quick charging voltage to the USB interface according to the quick charging voltage request so as to quickly charge the external equipment. The plug detection module is electrically connected with the USB interface and used for detecting the quick-charging protocol signal in real time through the USB interface and outputting a plug signal when detecting that the quick-charging protocol signal disappears. Wherein the fast charge protocol signal disappears when the external device starts to be pulled out. The quick charging control module is also electrically connected with the output end of the plug detection module and is also used for controlling the voltage conversion module to reduce the output voltage from the quick charging voltage to a preset voltage when receiving the pull-out signal. The time required from the moment that the plugging detection module detects that the quick charging protocol signal disappears to the moment that the voltage conversion module starts to reduce the output voltage is less than the time required from the moment that the external equipment is pulled out to the moment that the external equipment is completely pulled out.

A second aspect of the present application provides a fast charging chip, which is applied to a fast charging power supply device. The quick charging power supply equipment comprises a USB interface electrically connected with external equipment. The quick charging chip comprises a voltage conversion module, a quick charging control module and a plug detection module. The voltage conversion module is electrically connected with the USB interface. The quick charging control module is electrically connected with the voltage conversion module and the USB interface respectively, and is used for acquiring a quick charging protocol signal of the external equipment through the USB interface, identifying a quick charging voltage request of the external equipment according to the quick charging protocol signal, and controlling the voltage conversion module to output corresponding quick charging voltage to the USB interface according to the quick charging voltage request so as to quickly charge the external equipment. The plug detection module is electrically connected with the USB interface and used for detecting the quick-charging protocol signal in real time through the USB interface and outputting a plug signal when detecting that the quick-charging protocol signal disappears. Wherein the fast charge protocol signal disappears when the external device starts to be pulled out. The quick charging control module is also electrically connected with the output end of the plug detection module and is also used for controlling the voltage conversion module to reduce the output voltage from the quick charging voltage to a preset voltage when receiving the pull-out signal. The time required from the moment that the plugging detection module detects that the quick charging protocol signal disappears to the moment that the voltage conversion module starts to reduce the output voltage is less than the time required from the moment that the external equipment is pulled out to the moment that the external equipment is completely pulled out.

A third aspect of the present application provides a fast charging protection circuit, where the fast charging protection circuit includes a USB interface electrically connected to an external device, and the fast charging chip of the second aspect. And the voltage conversion module, the quick charge control module and the plug detection module of the quick charge chip are all electrically connected with the USB interface.

A fourth aspect of the present application provides a fast charging power supply apparatus, where the fast charging power supply apparatus includes the fast charging protection circuit of the first aspect or the third aspect, and a power input interface. The quick charging protection circuit is used for charging external equipment. The power input interface is electrically connected with the quick charge protection circuit and used for receiving an external power supply so as to provide input voltage for the quick charge protection circuit.

A fifth aspect of the present application provides a fast charging protection method, where the fast charging protection method is applied to the fast charging protection circuit of the first aspect or the third aspect, or applied to the fast charging chip of the second aspect, or applied to the fast charging power supply device of the fourth aspect. The quick charge protection method comprises the following steps: in the quick charging process, a quick charging protocol signal is detected in real time through a plug detection module; when the plug detection module detects that the quick charge protocol signal disappears, outputting a pull-out signal through the plug detection module, wherein the quick charge protocol signal disappears when the external device begins to be pulled out; and controlling a voltage conversion module to reduce the output voltage from the fast charging voltage to a preset voltage according to the pull-out signal. The time required from the moment that the plugging detection module detects that the quick charging protocol signal disappears to the moment that the voltage conversion module starts to reduce the output voltage is less than the time required from the moment that the external equipment is pulled out to the moment that the external equipment is completely pulled out.

According to the fast charging protection circuit and the method, the fast charging protocol signal is detected in real time through the plug detection module in the fast charging process, the response speed is high, the pulling-out action of the external equipment can be detected quickly in advance, the output voltage of the voltage conversion module is reduced in advance before the external equipment is completely pulled out, the overshoot amplitude of the output voltage can be effectively reduced, and the reliability of fast charging power supply equipment, such as a fast charging mobile power supply or a fast charging adapter, is improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a fast charging circuit provided in the prior art.

Fig. 2 is a schematic diagram of an overshoot of the output voltage of the fast charging circuit shown in fig. 1 when the external device is pulled out.

Fig. 3 is a schematic diagram of functional modules of a fast charging protection circuit according to a first embodiment of the present disclosure.

Fig. 4 is a schematic circuit diagram of the fast charge protection circuit shown in fig. 3.

Fig. 5 is a schematic diagram of pin structures of two USB interfaces, wherein the structure (a) in fig. 5 is a pin structure of a USB TYPE-a interface; the (B) configuration in fig. 5 is a configuration of a pin of the USB TYPE-C interface.

Fig. 6 is a schematic diagram of another circuit structure of the fast charge protection circuit shown in fig. 3.

Fig. 7 is a schematic diagram of an overshoot of the output voltage of the fast charge protection circuit shown in fig. 3, 4 or 6 when the external device is pulled out.

Fig. 8 is a schematic diagram of functional modules of a fast charging protection circuit according to a second embodiment of the present disclosure.

Fig. 9 is a schematic diagram of functional modules of a fast charging power supply device according to an embodiment of the present application.

Fig. 10 is a functional module schematic diagram of a fast charging mobile power supply according to an embodiment of the present disclosure.

Fig. 11 is a functional module schematic diagram of a quick charge adapter according to an embodiment of the present application.

Fig. 12 is a flowchart of a fast charge protection method according to an embodiment of the present application.

Description of the main elements

The following detailed description will further illustrate the present application in conjunction with the above-described figures.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. The drawings are for illustration purposes only and are merely schematic representations, not intended to limit the present application. It is to be understood that the embodiments described are only a few examples of the present application and not all examples. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

First, a brief description will be made of a fast charging circuit in a conventional fast charging power supply device (not shown).

As shown in fig. 1, the conventional fast charging circuit 100 generally includes a voltage conversion module 11, a fast charging control module 12, and a USB interface 13. The USB interface 13 is used for being electrically connected to an external device 200, such as a mobile phone, through a USB charging cable 21. The voltage conversion module 11 is electrically connected to a VBUS pin of the USB interface 13, and outputs a charging voltage to the external device 200 through the VBUS pin of the USB interface 13. In a general case, for example, when the external device 200 is not plugged into the USB interface 13, the voltage conversion module 11 outputs a preset normal charging voltage Vout, for example, a normal charging voltage of 5V, to the VBUS pin of the USB interface 13. The voltage conversion module 11 may be a DC-DC BOOST module. It is understood that the fast charge control module 12, or the voltage conversion module 11 and the fast charge control module 12 may be disposed in a fast charge chip.

The quick charging control module 12 is electrically connected with the voltage conversion module 11 and the USB interface 13 respectively. When the external device 200 is plugged into the USB interface 13, the voltage conversion module 11 outputs a preset normal charging voltage Vout to charge the external device 200, and at this time, the external device 200 enters a normal charging mode. After the external device 200 is plugged into the USB interface 13, the fast charging control module 12 may communicate with the external device 200 through the USB interface 13 to obtain a fast charging protocol signal of the external device 200.

The fast charging control module 12 is further configured to identify a fast charging voltage request of the external device 200 according to the fast charging protocol signal, and control the voltage conversion module 11 to output a corresponding fast charging voltage to the VBUS pin of the USB interface 13 according to the fast charging voltage request, so as to perform fast charging on the external device 200, where the external device 200 enters a fast charging mode.

For example, the external device 200 applies for a 12V fast charge voltage, and the fast charge control module 12 controls the voltage conversion module 11 to output a 12V voltage Vout to the VBUS pin of the USB interface 13, so as to fast charge the external device 200. The fast charging control module 12 may obtain the fast charging protocol signal through a DP pin and a DM pin of the USB interface 13.

When the USB charging wire 21 is suddenly pulled out from the USB interface 13, or the USB charging wire 21 is suddenly pulled out from the external device 200, the fast charging protocol signal disappears. When the rapid charging control module 12 recognizes that the rapid charging protocol signal disappears, the rapid charging control module 12 controls the voltage conversion module 11 to reduce the output voltage Vout to a preset voltage, for example, 5V.

Since each connection pin of the USB input interface of the USB charging wire 21 and the USB interface 13 has a certain length in terms of mechanical structure, it takes a certain time to separate the two. As shown in fig. 2, the process of pulling out the external device 200 during the fast charging process is as follows: the external device 200 starts to be pulled out at time t1, and the external device 200 is completely pulled out at time t 2. That is, the time Δ T1 required from the start of the pulling-out of the external device 200 to the complete pulling-out is about 10 to 20 ms. And the external device 200 is pulled out, and the response time required by the rapid charging control module 12 is about 10-20ms until the rapid charging control module 12 recognizes that the rapid charging protocol signal disappears. That is, the response time of the rapid charging control module 12 recognizing that the rapid charging protocol signal disappears is approximately equal to the time required for the external device 200 to be completely pulled out. In this way, when the fast charge control module 12 controls the voltage conversion module 11 to lower the output voltage Vout to the preset voltage, the external device 200 is completely pulled out.

As shown in fig. 2, during a time Δ T1, for example, 10ms, the rapid charging control module 12 has not recognized that the rapid charging protocol signal is disappeared, and the output voltage Vout of the voltage conversion module 11 is maintained at the set value of 12V. The external device 200 is completely pulled out at time t2, and due to the sudden change of the output load current of the voltage conversion module 11 (the external device 200 is suddenly pulled out, which is equivalent to the sudden change of the output load current to 0), and the power transient response characteristic of the fast charging power supply device, the output voltage Vout of the voltage conversion module 11 overshoots, and in a severe case, the overshoot voltage overshoots to about 15.5V, and the overshoot amplitude Δ V1=3.5V, which seriously affects the safety of the fast charging power supply device.

The current general approach to solve this problem is to improve the transient response of the voltage conversion module 11 to reduce the overshoot voltage amplitude, for example, increase the capacitance of the filter capacitor Cout, or change the analog circuit parameters of the voltage conversion module 11 itself (for example, increase the DC-DC switching frequency, or change the control loop parameters, etc.). However, in the existing methods for improving the overshoot voltage, the cost of the fast charging power supply device is increased by increasing the capacity of the filter capacitor Cout, and the method for modifying the analog circuit parameters of the voltage conversion module 11 itself is complicated and is not easy to implement.

In view of the above problems in the prior art, embodiments of the present application provide a fast charging protection circuit and method, and a fast charging mobile power supply and a fast charging adapter having the fast charging protection circuit, which can quickly detect a pulling-out action of an external device in advance for a situation that the external device is suddenly pulled out during a fast charging process, and reduce an output voltage in advance before the external device is completely pulled out, so that an overshoot amplitude of the output voltage can be effectively reduced, and the safety of the fast charging mobile power supply/the fast charging adapter is improved.

Fig. 3 is a schematic diagram of functional modules of a fast charging protection circuit according to a first embodiment of the present disclosure. As shown in fig. 3, the fast charge protection circuit 300 includes a voltage conversion module 31, a fast charge control module 32, a USB interface 33, and a plug detection module 34. For details of the voltage conversion module 31, the fast charge control module 32, and the USB interface 33, please refer to the foregoing detailed description of the voltage conversion module 11, the fast charge control module 12, and the USB interface 13 in fig. 1, and for brevity and avoidance of repetition, repeated details are not repeated herein. It is understood that some or all of the voltage conversion module 31, the fast charge control module 32, and the plug detection module 34 may be disposed in the fast charge chip.

In this embodiment, the plug detection module 34 is electrically connected to the USB interface 33, and is configured to detect the fast charging protocol signal in real time through the USB interface 33, and output a pull-out signal when detecting that the fast charging protocol signal disappears. The fast charging control module 32 is further electrically connected to the output end of the plug detection module 34, and the fast charging control module 32 is further configured to control the voltage conversion module 31 to reduce the output voltage from the fast charging voltage to a preset voltage, for example, a 5V common charging voltage, when receiving the pull-out signal.

Wherein the fast charge protocol signal disappears when the external device 200 starts to be pulled out. The quick charging protocol signal comprises but is not limited to a DP/DM signal of a quick charging protocol and/or a CC1/CC2 signal of a Type-C protocol.

In this embodiment, the plug detection module 34 is electrically connected to the preset pin of the USB interface 33, which is used for acquiring the fast charging protocol signal, the plug detection module 34 is used for detecting the voltage change of the preset pin in real time, and determining whether the voltage change of the preset pin meets the preset condition, and when the voltage change of the preset pin meets the preset condition, determining that the external device 200 starts to be pulled out and the fast charging protocol signal disappears, and outputting the pull-out signal.

In this embodiment, the USB interface 33 includes a USB TYPE-a interface and a USB TYPE-C interface, and the preset pin is a DP pin of the USB TYPE-a interface or a CC1/CC2 pin of the USB TYPE-C interface.

The plug detection module 34 includes a comparison module 341, an input end of the comparison module 341 is electrically connected to a preset pin of the USB interface 33, and the comparison module 341 is configured to compare a voltage of the preset pin of the USB interface 33 with a preset reference voltage, so as to determine whether a voltage change of the preset pin of the USB interface 33 meets the preset condition.

In this embodiment, the plug detection module 34 further includes a Debounce module 342, the Debounce module 342 is electrically connected between the output end of the comparison module 341 and the fast charge control module 32, and the Debounce module 342 is configured to transmit the pulling signal to the fast charge control module 32 when the pulling signal is continuously received within a preset time period. Wherein the preset time length is less than the time required by the external equipment from being pulled out to being completely pulled out. The preset time may be set to 1ms, for example. It can be understood that, by setting the debounce time of 1ms by setting the debounce module 342, it is possible to prevent an erroneous operation due to interference of burrs or the like.

In this embodiment, the time required from the time when the plugging detection module 34 detects that the fast charge protocol signal disappears to the time when the voltage conversion module 31 starts to lower the output voltage Vout is less than the time required from the time when the external device 200 starts to be unplugged to the time when the external device is completely unplugged. In this way, when the voltage conversion module 31 starts to decrease the output voltage, the USB interface 33 and the external device 200 are not yet completely disconnected from each other, and the voltage conversion module 31 continues to output the charging voltage to the external device 200 through the USB interface 33. That is, the fast charge control module 32 controls the voltage conversion module 31 to decrease the output voltage before the external device 200 is completely pulled out.

The fast charging protection circuit 300 provided by the application detects a fast charging protocol signal in real time through the plug detection module 34 in the fast charging process, has a fast response speed, can quickly detect the pulling action of the external device 200 in advance, and before the external device 200 is completely pulled out, namely, before the external device 200 is completely disconnected from the fast charging mobile power supply or the fast charging adapter, the output voltage of the voltage conversion module 31 is reduced in advance, so that the overshoot amplitude of the output voltage can be effectively reduced, and the reliability of the fast charging mobile power supply or the fast charging adapter is further improved.

Fig. 4 is a schematic circuit diagram of the fast charge protection circuit shown in fig. 3. As shown in fig. 4, the fast charge protection circuit 400 includes a voltage conversion module 41, a fast charge control module 42, a USB interface 43, and a plug detection module 44. The voltage conversion module 41, the fast charge control module 42, the USB interface 43, and the plug detection module 44 correspond to the voltage conversion module 31, the fast charge control module 32, the USB interface 33, and the plug detection module 34 shown in fig. 3 one to one.

In this embodiment, the USB interface 43 is a USB TYPE-a interface, and includes a VBUS pin, a DM pin, a DP pin, and a GND pin. The preset pin is a DP pin of the USB interface.

The comparing module includes a comparator 441, the comparator 441 includes two input ends, one of the input ends is electrically connected to the DP pin of the USB interface 43, the other input end is configured to receive a first reference voltage, and the output end of the comparator 441 is electrically connected to the fast charge control module 42 through the debounce module 442.

The structure of the pins of both USB interfaces is shown in fig. 5. The structure (a) in fig. 5 is a pin structure of a USB TYPE-a interface, and the structure (B) in fig. 5 is a pin structure of a USB TYPE-C interface. Due to the special structure of the USB interface, the VBUS pin and the GND pin of the USB interface are longer than the DP/DM pin and the CC1/CC2 pin in mechanical structure.

For the USB interface 33, when the USB charging wire 21 is pulled out, the DP/DM/CC1/CC2 pins of the USB charging wire 21 are turned off first, and at this time, the fast charging protocol signal disappears, and then the VBUS/GND pin is turned off, and this time interval is generally about 10-20 ms. That is, the time at which the pin DP/DM/CC1/CC2 is turned off corresponds to the time at which the external device 200 starts to be pulled out, and the time at which the pin VBUS/GND is turned off corresponds to the time at which the external device 200 is completely pulled out.

For the USB TYPE-a interface, when the external device 200 is plugged in, according to the characteristics of the fast charging protocol, the voltage on the DP pin is generally above 0.325V when the fast charging connection is successful, and after the external device 200 is pulled out, that is, after the fast charging connection is disconnected, the voltage on the DP pin is pulled down to be less than 0.325V.

In this embodiment, the comparator 441 is configured to output the pull-out signal when the voltage of the DP pin is lower than the first reference voltage, that is, the preset condition is that the voltage of the DP pin is lower than the first reference voltage. Wherein the first reference voltage may be set to 0.325V. In this way, when the voltage of the DP pin is detected to be less than 0.325V for 1ms or more (the debounce time is set to 1ms in order to prevent interference such as glitch), it is determined that the external device 200 is unplugged.

In one embodiment, as shown in fig. 4, the positive input terminal of the comparator 441 is electrically connected to the DP pin of the USB interface 43, and the negative input terminal receives a first reference voltage of 0.325V. According to the working principle of the comparator, when the external device 200 is in the fast charging state, the voltage of the DP pin is higher than 0.325V, and the comparator outputs a high level; when the external device 200 is pulled out, the voltage of the DP pin is lower than 0.325V, and the comparator 441 outputs a low level. That is, in the one embodiment, the pull-out signal is a low level signal.

Optionally, in another embodiment, a negative input terminal of the comparator 441 is electrically connected to the DP pin of the USB interface 43, and a positive input terminal receives the first reference voltage of 0.325V. It is to be understood that in the other embodiment, the pull-out signal is a high level signal.

Fig. 6 is a schematic diagram of another circuit structure of the fast charge protection circuit shown in fig. 3. As shown in fig. 6, the fast charging protection circuit 500 includes a voltage conversion module 51, a fast charging control module 52, a USB interface 53, and a plugging detection module 54. The voltage conversion module 51, the fast charge control module 52, the USB interface 53, and the plug detection module 54 correspond to the voltage conversion module 31, the fast charge control module 32, the USB interface 33, and the plug detection module 34 shown in fig. 3 one to one.

In this embodiment, the USB interface 53 is a USB TYPE-C interface, and includes a VBUS pin, a DM pin, a DP pin, a CC1 pin, a CC2 pin, and a GND pin. The preset pins are a CC1 pin and a CC2 pin of the USB interface.

The comparing module includes a first comparator 5411 and a second comparator 5412, wherein the first comparator 5411 includes two input terminals, one of which is electrically connected to the CC1 pin of the USB interface 53, and the other of which is configured to receive a second reference voltage. The second comparator 5412 includes two input terminals, one of which is electrically connected to the CC2 pin of the USB interface 53, and the other of which is used for receiving a third reference voltage.

For the USB TYPE-C interface, when the external device 200 is plugged in, according to the characteristics of the fast charging protocol, the voltage on the pin CC1 or the pin CC2 is generally lower than 2V when the fast charging connection is successful. When the external device 200 is pulled out, i.e. the fast charging connection is disconnected, the voltage on the pin CC1 or the pin CC2 is pulled up to 3.3V.

In this embodiment, the first comparator 5411 is configured to output the pull-out signal when the voltage at the pin CC1 is higher than the second reference voltage. The second comparator 5412 is configured to output the pull-out signal when the voltage at the pin CC2 is higher than the third reference voltage.

Wherein, the second reference voltage and the third reference voltage can be both set to be 2.9V. Therefore, by detecting and determining whether the voltage of the pin CC1 or the pin CC2 is higher than 2.9V, it can be determined whether the external device 200 is pulled out.

The plug detection module 54 further includes a logic gate circuit 543, the logic gate circuit 543 includes two inputs, one of the inputs is electrically connected to the output of the first comparator 5411, another input is electrically connected to the output of the second comparator 5412, the output of the logic gate circuit 543 is electrically connected to the fast charge control module 52, the logic gate circuit 543 is used for performing logic operation on the signal output by the first comparator 5411 and the second comparator 5412, so that the voltage at the pin CC1 is higher than the second reference voltage, or the voltage at the pin CC2 is higher than when the third reference voltage, the plug signal is output. That is, the preset condition is that the voltage at the pin CC1 is higher than the second reference voltage, or the voltage at the pin CC2 is higher than the third reference voltage.

In one embodiment, as shown in fig. 6, the positive input terminal of the first comparator 5411 is electrically connected to the CC1 pin of the USB interface 53, and the negative input terminal receives the second reference voltage of 2.9V. The positive input end of the second comparator 5412 is electrically connected to the CC2 pin of the USB interface 53, and the negative input end receives a third reference voltage of 2.9V. According to the working principle of the comparator, when the external device 200 is in the fast charging state, the voltage of the pin CC1 or the pin CC2 is lower than 2.9V, and both the first comparator 5411 and the second comparator 5412 output low level; when the external device 200 is unplugged, the voltage of the pin CC1 or the pin CC2 is higher than 2.9V, and the first comparator 5411 and the second comparator 5412 both output a high level. That is, in the one embodiment, the pull-out signal is a high level signal.

In the above embodiment, the logic gate circuit 543 is an or gate, and the or gate is configured to perform a logical or operation on the signals output by the first comparator 5411 and the second comparator 5412, so as to output the high level signal, i.e., a pull-out signal, when the voltage at the pin CC1 is higher than the second reference voltage or the voltage at the pin CC2 is higher than the third reference voltage.

In another embodiment, a negative input terminal of the first comparator 5411 is electrically connected to the CC1 pin of the USB interface 53, and a positive input terminal thereof receives a second reference voltage of 2.9V. A negative input end of the second comparator 5412 is electrically connected to the CC2 pin of the USB interface 53, and a positive input end receives a third reference voltage of 2.9V. It is to be understood that in the other embodiment, the pull-out signal is a low level signal.

In another embodiment, the logic gate circuit 543 is an and gate, and the and gate is configured to perform a logical and operation on the signals output by the first comparator 5411 and the second comparator 5412, so as to output the low level signal, i.e. a pull-out signal, when the voltage at the pin CC1 is higher than the second reference voltage, or the voltage at the pin CC2 is higher than the third reference voltage.

As shown in fig. 6, the plug detection module 54 includes two

debounce modules

5421 and 5422, wherein one debounce module 5421 is electrically connected between the output terminal of the first comparator 5411 and one input terminal of the logic gate circuit 543, and the other debounce module 5422 is electrically connected between the output terminal of the second comparator 5412 and the other input terminal of the logic gate circuit 543.

In another embodiment, the plugging detection module 54 may include a debounce module electrically connected between the output of the logic gate circuit 543 and the fast charge control module 52.

Fig. 7 is a schematic diagram of an overshoot of the output voltage Vout of the fast charge protection circuit shown in fig. 3, 4 or 6 when the external device 200 is pulled out.

As mentioned previously, the VBUS pin and GND pin of the USB interface are mechanically longer than the DP/DM pin, and the CC1/CC2 pin. As shown in fig. 7, the process of pulling out the external device 200 during the quick charging process includes: pulling out the external device 200 at a time t1, wherein the DP/DM/CC1/CC2 pin of the USB interface 33 is disconnected from the DP/DM/CC1/CC2 pin of the USB charging wire 21 of the external device 200, and the fast charging protocol signal disappears; and completely pulling out the external device 200 at the time t2, wherein the VBUS/GND pin of the USB interface 33 and the VBUS/GND pin of the USB charging wire 21 are disconnected.

In the process of pulling out the external device 200, when the DP/DM/CC1/CC2 pin of the USB interface 33 and the DP/DM/CC1/CC2 pin of the USB charging wire 21 are disconnected, the fast charging protocol signal disappears. After a delay Δ T2, for example, 1ms debounce time, that is, at time T3, the fast charging control module 32 controls the voltage conversion module 31 to decrease the output voltage Vout, and at this time, since Δ T2< Δ T1, the VBUS/GND pin of the USB interface 33 and the VBUS/GND pin of the USB charging line 21 are not disconnected, the external device 200 continues to draw current from the VBUS pin, so that the output voltage Vout of the voltage conversion module 31 does not overshoot. Referring to fig. 3 again, the output terminal of the voltage conversion module 31 is connected to the ground through the filter capacitor Cout, and it can be understood that although the fast charge control module 32 controls the voltage conversion module 31 to reduce the output voltage Vout from 12V to 5V, due to the filter capacitor Cout, the output voltage Vout does not have a voltage jump, that is, the output voltage Vout does not jump from the fast charge voltage of 12V to the normal voltage of 5V, but starts to drop linearly from the fast charge voltage of 12V.

When the external device 200 or the USB charging wire 21 is completely pulled out, the output load current of the voltage converting module 31 suddenly changes to 0, the output voltage Vout starts to overshoot due to transient response, but since the output voltage Vout at this time has been continuously decreased for a period of time Δ T3= Δ T1- Δ T2, the voltage value of the output voltage Vout has been decreased a lot, and the overshoot voltage that occurs does not overshoot to the voltage value that was previously overshot at the time of the output voltage of 12V or 9V.

Taking the fast charge voltage as 12V as an example, in a fast charge power supply device (for example, a fast charge mobile power supply or a fast charge adapter) that does not use the fast charge protection circuit of the present application, as shown in fig. 2, the overshoot voltage may reach 15.5V, and the overshoot amplitude Δ V1 is 3.5V. In contrast, in the fast charge structure using the fast charge protection circuit of the present application, as shown in fig. 7, the overshoot voltage is 13.2V, the overshoot amplitude Δ V2 is 1.2V, and the overshoot amplitude is greatly reduced.

It can be seen that, compared with the existing fast charging circuit, the fast charging protection circuit provided by the application judges the pulling-out action of the external device in advance by detecting the DP signal on the USB interface in real time or the voltage characteristics of the CC1 and CC2 signals in the fast charging process, and reduces the output voltage of the boost circuit to 5V in advance before the external device and the fast charging mobile power supply/fast charging adapter are completely disconnected from each other, so that the output voltage of the boost circuit is lower than the initial fast charging voltage, and the overshoot amplitude of the output voltage Vout can be effectively reduced even under the condition that the boost transient response is not improved, thereby improving the reliability of the fast charging mobile power supply/fast charging adapter.

In addition, the rapid charging protection circuit provided by the application detects a rapid charging protocol signal through the plug-in detection module, has high response speed, can achieve the purpose of effectively reducing the overshoot amplitude of the output voltage Vout without increasing the capacity of a filter capacitor of an output end or changing the analog circuit parameters of the boost circuit to improve boost transient response, and further achieves the remarkable reduction of the overshoot amplitude by a low-cost method.

Fig. 8 is a schematic diagram of functional modules of a fast charging protection circuit according to a second embodiment of the present disclosure. The fast charging protection circuit 600 includes a USB interface 61 and a fast charging chip 62. As shown in fig. 8, in this embodiment, the fast charging chip 62 includes a voltage conversion module 621, a fast charging control module 622, and a plug detection module 623. The voltage conversion module 621, the fast charging control module 622, and the plug detection module 623 are electrically connected to the USB interface 61. The USB interface 61, the voltage conversion module 621, the fast charge control module 622, and the plug detection module 623 are in one-to-one correspondence with the USB interface 33, the voltage conversion module 31, the fast charge control module 32, and the plug detection module 34 shown in fig. 3. For details of the USB interface 61, the voltage conversion module 621, the fast charge control module 622, and the plug detection module 623, please refer to the foregoing detailed description of the USB interface 33, the voltage conversion module 31, the fast charge control module 32, and the plug detection module 34 of fig. 3, and for brevity and avoidance of repetition, repeated details are not repeated herein.

Fig. 9 is a schematic diagram of functional modules of a fast charging power supply device according to an embodiment of the present application. As shown in fig. 9, the fast charging power supply device 700 includes a power input interface 71 and a fast charging protection circuit 72. The power input interface 71 is electrically connected to the fast charge protection circuit 72, and the power input interface 71 is configured to receive an external power source, for example, 220V ac mains, so as to provide an input voltage to the fast charge protection circuit 72. The fast charging protection circuit 72 is used for charging the external device 200.

The fast charge protection circuit 72 may correspond to the fast

charge protection circuits

300, 400, 500, and 600 shown in fig. 3, 4, 6, or 8, and for details of the fast charge protection circuit 72, reference is made to the foregoing detailed description of the fast

charge protection circuits

300, 400, 500, and 600 shown in fig. 3, 4, 6, or 8, so that repeated descriptions are omitted herein for brevity and to avoid repetition.

The fast charging power supply device 700 may be the fast charging mobile power supply 800 shown in fig. 10 or the fast charging adapter 900 shown in fig. 11.

Fig. 10 is a functional module schematic diagram of a fast charging mobile power supply according to an embodiment of the present disclosure. As shown in fig. 10, the fast charging mobile power supply 800 includes a power input interface 81, a battery 82, and a fast charging protection circuit 83. The fast charge protection circuit 83 may correspond to the fast

charge protection circuits

300, 400, 500, and 600 shown in fig. 3, 4, 6, or 8. For details of the fast charge protection circuit 83, please refer to the above detailed descriptions of the fast

charge protection circuits

300, 400, 500, and 600, and for brevity and avoidance of repetition, repeated descriptions are omitted here.

The power input interface 81 is used for receiving an external power source, such as 220V ac mains. The battery 82 is electrically connected to the power input interface 81 and the fast charging protection circuit 83, and the battery 82 is configured to receive an input voltage of the external power source for charging. The voltage conversion module of the fast charge protection circuit 83 is configured to convert the voltage of the battery 82 into a preset voltage or a fast charge voltage corresponding to the fast charge protocol signal, so as to charge an external device.

The quick charge mobile power supply provided by the application adopts the quick charge protection circuit 83, can realize the remarkable reduction of the upper surge voltage amplitude by using a simple circuit design with low cost, and has higher reliability.

Fig. 11 is a functional module schematic diagram of a quick charge adapter according to an embodiment of the present application. As shown in fig. 11, the fast charging adapter 900 includes a power input interface 91, an AC-DC conversion module 92, and a fast charging protection circuit 93. The fast charge protection circuit 93 may correspond to the fast

charge protection circuits

300, 400, 500, 600 shown in fig. 3, 4, 6, or 8. For details of the fast charge protection circuit 93, please refer to the above detailed descriptions of the fast

charge protection circuits

The power input interface 91 is used for receiving an external power source, such as 220V ac mains. The AC-DC conversion module 92 is electrically connected to the power input interface 91 and the fast charging protection circuit 93, and the AC-DC conversion module 92 is configured to convert an input voltage of the external power supply into a direct current voltage. The voltage conversion module of the fast charge protection circuit 93 may be configured to convert the dc voltage into a preset voltage or a fast charge voltage corresponding to the fast charge protocol signal, so as to charge an external device.

The quick charging adapter provided by the application adopts the quick charging protection circuit 93, so that the overshoot voltage amplitude can be remarkably reduced by using a low-cost simple circuit design, and the quick charging adapter has high reliability.

Fig. 12 is a flowchart of a fast charge protection method according to an embodiment of the present application. The fast charge protection method can be applied to the fast

charge protection circuits

300, 400, 500, 600 shown in fig. 3, 4, 6 or 8.

In the present embodiment, as shown in fig. 12, the quick charge protection method includes the following steps.

And 1001, detecting a quick charge protocol signal in real time through a plug detection module in the quick charge process.

In this embodiment, the step 1001 may specifically include:

in the quick charging process, detecting the voltage change of a preset pin of a USB interface for acquiring the quick charging protocol signal in real time through the plug detection module;

judging whether the voltage change of the preset pin meets a preset condition or not; and

and when the voltage change of the preset pin is detected to meet a preset condition, determining that the external equipment starts to be pulled out, and the quick-charging protocol signal disappears.

In this embodiment, the USB interface includes USB TYPE-A interface and USB TYPE-C interface, it is for to predetermine the pin the DP pin of USB TYPE-A interface or the CC1/CC2 pin of USB TYPE-C interface.

The step of determining whether the voltage variation of the preset pin meets the preset condition may specifically include: and comparing the voltage of the preset pin of the USB interface with a preset reference voltage to judge whether the voltage change of the preset pin of the USB interface meets the preset condition.

Step 1002, when the plug detection module detects that the fast charging protocol signal disappears, outputting a plug signal through the plug detection module.

And 1003, controlling a voltage conversion module to reduce the output voltage from the fast charging voltage to a preset voltage according to the pulling signal.

The time required from the moment that the plugging detection module detects that the quick charging protocol signal disappears to the moment that the voltage conversion module starts to reduce the output voltage is less than the time required from the moment that the external equipment is pulled out to the moment that the external equipment is completely pulled out.

For specific technical details of steps 1001-1003 of the present embodiment, reference may be made to the description of related technical details of the embodiments shown in fig. 3-8, and repeated details are not repeated herein.

According to the quick-charging protection method, the quick-charging protocol signal is detected in real time through the plug detection module in the quick-charging process, so that the pulling-out action of the external equipment can be detected quickly in advance, the output voltage of the voltage conversion module is reduced in advance before the external equipment is completely pulled out, the overshoot amplitude of the output voltage can be effectively reduced, and the reliability of quick-charging power supply equipment, such as a quick-charging mobile power supply or a quick-charging adapter, is improved.

Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present application and not for limiting, and although the present application is described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A fast charge protection circuit comprising:

the USB interface is used for being electrically connected with external equipment;

the voltage conversion module is electrically connected with the USB interface;

the quick charging control module is electrically connected with the voltage conversion module and the USB interface respectively, and is used for acquiring a quick charging protocol signal of the external equipment through the USB interface, identifying a quick charging voltage request of the external equipment according to the quick charging protocol signal, and controlling the voltage conversion module to output corresponding quick charging voltage to the USB interface according to the quick charging voltage request so as to quickly charge the external equipment; and

the plug detection module is electrically connected with the USB interface and used for detecting the quick-charging protocol signal in real time through the USB interface and outputting a pull-out signal when the quick-charging protocol signal disappears, wherein the quick-charging protocol signal disappears when the external equipment begins to be pulled out;

the quick charge control module is also electrically connected with the output end of the plug detection module, and is also used for controlling the voltage conversion module to reduce the output voltage from the quick charge voltage to a preset voltage when receiving the pull-out signal;

2. The protection circuit of claim 1, wherein the plug detection module is electrically connected to a preset pin of the USB interface for acquiring the fast charge protocol signal, and the plug detection module is configured to detect a voltage change of the preset pin in real time, determine whether the voltage change of the preset pin meets a preset condition, and determine that the external device starts to be pulled out and the fast charge protocol signal disappears when the voltage change of the preset pin meets the preset condition, and output the pull-out signal.

3. The protection circuit of claim 2, wherein the plug detection module includes a comparison module, an input terminal of the comparison module is electrically connected to a preset pin of the USB interface, and the comparison module is configured to compare a voltage of the preset pin of the USB interface with a preset reference voltage, so as to determine whether a voltage change of the preset pin of the USB interface satisfies the preset condition.

4. The protection circuit of claim 3, wherein the plug detection module further comprises a debounce module electrically connected between the output terminal of the comparison module and the fast charge control module, the debounce module is configured to transmit the pull-out signal to the fast charge control module when the pull-out signal is continuously received within a preset time period, wherein the preset time period is less than a time required for the external device to be pulled out completely from the start.

5. The fast charging protection circuit of claim 4, wherein the USB interface is a USB TYPE-A interface, comprising a VBUS pin, a DM pin, a DP pin, and a GND pin; the preset pin is a DP pin of the USB interface;

the comparison module comprises a comparator, the comparator comprises two input ends, one input end of the comparator is electrically connected with a DP pin of the USB interface, the other input end of the comparator is used for receiving a first reference voltage, and the output end of the comparator is electrically connected with the quick charge control module through the debounce module;

wherein the comparator is configured to output the pull-out signal when the voltage of the DP pin is lower than the first reference voltage.

6. The fast charging protection circuit of claim 4, wherein the USB interface is a USB TYPE-C interface, comprising a VBUS pin, a DM pin, a DP pin, a CC1 pin, a CC2 pin, and a GND pin; the preset pins are a CC1 pin and a CC2 pin of the USB interface;

the comparison module comprises:

a first comparator, including two input terminals, one of the input terminals of the first comparator being electrically connected to the pin CC1 of the USB interface, and the other input terminal of the first comparator being configured to receive a second reference voltage, wherein the first comparator is configured to output the pull-out signal when the voltage at the pin CC1 is higher than the second reference voltage; and

a second comparator, including two input terminals, one of the input terminals of the second comparator being electrically connected to the pin CC2 of the USB interface, and the other input terminal of the second comparator being configured to receive a third reference voltage, wherein the second comparator is configured to output the pull-out signal when the voltage at the pin CC2 is higher than the third reference voltage;

the plug detection module further comprises a logic gate circuit, the logic gate circuit comprises two input ends, one of the input ends of the logic gate circuit is electrically connected with the output end of the first comparator, the other input end of the logic gate circuit is electrically connected with the output end of the second comparator, the output end of the logic gate circuit is electrically connected with the fast charge control module, and the logic gate circuit is used for carrying out logic operation on signals output by the first comparator and the second comparator so that the voltage of the CC1 pin is higher than the second reference voltage, or the voltage of the CC2 pin is higher than the third reference voltage, and outputting the pull-out signal.

7. The circuit of claim 6, wherein the plug detection module comprises two debounce modules, one debounce module being electrically connected between the output of the first comparator and one of the inputs of the logic gate circuit, and the other debounce module being electrically connected between the output of the second comparator and the other input of the logic gate circuit.

8. The fast charge protection circuit of claim 6, wherein the debounce module is electrically connected between the output of the logic gate circuit and the fast charge control module.

9. The utility model provides a fill chip soon, is applied to and fills in power supply unit soon, fill power supply unit soon and include the USB interface of being connected with external equipment electricity, its characterized in that, fill the chip soon and include:

the voltage conversion module is electrically connected with the USB interface;

10. The quick charging chip according to claim 9, wherein the plug detection module is electrically connected to a preset pin of the USB interface for acquiring the quick charging protocol signal, and the plug detection module is configured to detect a voltage change of the preset pin in real time, determine whether the voltage change of the preset pin meets a preset condition, determine that the external device starts to be pulled out and the quick charging protocol signal disappears when the voltage change of the preset pin meets the preset condition, and output the pull-out signal.

11. The quick charging chip according to claim 10, wherein the plug detection module includes a comparison module, an input terminal of the comparison module is electrically connected to a preset pin of the USB interface, and the comparison module is configured to compare a voltage of the preset pin of the USB interface with a preset reference voltage, so as to determine whether a voltage change of the preset pin of the USB interface satisfies the preset condition.

12. The fast charging chip according to claim 11, wherein the plug detection module further comprises a debounce module electrically connected between the output terminal of the comparison module and the fast charging control module, the debounce module is configured to transmit the pull-out signal to the fast charging control module when the pull-out signal is continuously received within a preset time period, wherein the preset time period is less than a time required for the external device to be completely pulled out from the start of being pulled out.

13. The fast charging chip of claim 12, wherein the USB interface is a USB TYPE-a interface, and includes a VBUS pin, a DM pin, a DP pin, and a GND pin; the preset pin is a DP pin of the USB interface;

14. The fast charging chip of claim 12, wherein the USB interface is a USB TYPE-C interface, and includes a VBUS pin, a DM pin, a DP pin, a CC1 pin, a CC2 pin, and a GND pin; the preset pins are a CC1 pin and a CC2 pin of the USB interface;

the comparison module comprises:

15. A fast charging chip as claimed in claim 14, wherein said plug detection module comprises two of said debounce modules, one of said debounce modules being electrically connected between the output of said first comparator and one of the inputs of said logic gate circuit, and the other of said debounce modules being electrically connected between the output of said second comparator and the other of the inputs of said logic gate circuit.

16. The fast charge chip of claim 14, wherein the debounce module is electrically connected between the output of the logic gate circuit and the fast charge control module.

17. A fast charge protection circuit comprising:

the USB interface is used for being electrically connected with external equipment; and

the quick charging chip of any one of claims 9 to 16, wherein the voltage conversion module, the quick charging control module and the plug detection module of the quick charging chip are electrically connected to the USB interface.

18. A fast charging power supply apparatus comprising:

the fast charge protection circuit of any one of claims 1-8 or 17, configured to charge an external device; and

and the power input interface is electrically connected with the quick charge protection circuit and is used for receiving an external power supply so as to provide input voltage for the quick charge protection circuit.

19. A fast charging power supply device as recited in claim 18, wherein the fast charging power supply device is a fast charging portable power source, the fast charging portable power source further comprises a battery electrically connected to the power input interface and the fast charging protection circuit, respectively, the battery being configured to receive an input voltage of the external power source for charging;

and the voltage conversion module of the quick charge protection circuit is used for converting the voltage of the battery into a preset voltage or a quick charge voltage corresponding to the quick charge protocol signal so as to charge the external equipment.

20. The fast charging power supply device according to claim 18, wherein the fast charging power supply device is a fast charging adapter, the fast charging adapter further comprises an AC-DC conversion module electrically connected to the power input interface and the fast charging protection circuit, respectively, the AC-DC conversion module is configured to convert an input voltage of the external power supply into a direct current voltage;

and the voltage conversion module of the quick charge protection circuit is used for converting the direct-current voltage into a preset voltage or a quick charge voltage corresponding to the quick charge protocol signal so as to charge the external equipment.

21. A fast charging protection method, wherein the fast charging protection method is applied to the fast charging protection circuit of any one of claims 1 to 8 or 17, and the fast charging protection method comprises:

in the quick charging process, a quick charging protocol signal is detected in real time through a plug detection module;

when the plug detection module detects that the quick charge protocol signal disappears, outputting a pull-out signal through the plug detection module, wherein the quick charge protocol signal disappears when the external device begins to be pulled out; and

controlling a voltage conversion module to reduce the output voltage from the fast charging voltage to a preset voltage according to the pull-out signal;

22. The fast charging protection method of claim 21, wherein detecting the fast charging protocol signal in real time by the plug detection module comprises:

detecting the voltage change of a preset pin of a USB interface for acquiring the quick charge protocol signal in real time through the plug detection module;

and when the voltage change of the preset pin is detected to meet a preset condition, determining that the external equipment starts to be pulled out and the quick-charging protocol signal disappears.

23. The fast charging protection method of claim 22, wherein the USB interface comprises a USB TYPE-a interface and a USB TYPE-C interface, and the preset pin is a DP pin of the USB TYPE-a interface or a CC1/CC2 pin of the USB TYPE-C interface; judging whether the voltage change of the preset pin meets a preset condition comprises the following steps:

and comparing the voltage of the preset pin of the USB interface with a preset reference voltage to judge whether the voltage change of the preset pin of the USB interface meets the preset condition.