A fast charging protection circuit and method

Abstract

The present invention discloses a fast charging protection circuit and method, the circuit includes: the host circuit includes a VBUS device interface, an ID device interface and a GND device interface; wherein the ID device interface is connected to the GND device interface; the detection circuit includes a charging interface circuit, a PD chip and a Type-C interface, and the charging interface circuit, the PD chip and the Type-C interface are connected in sequence; wherein the detection circuit is connected to the charging circuit through the Type-C interface; the charging interface circuit includes a VBUS charging interface, an ID charging interface and a GND charging interface, when the host circuit is connected to the detection circuit, the VBUS device interface is connected to the VBUS charging interface, and the ID charging interface, the ID device interface, the GND device interface and the GND charging interface are connected in sequence. The present invention can effectively prevent the PD chip from burning out due to the high PD fast charging voltage, and improve the safety and reliability of the use of the charging base.

Description

Technical Field

[0001] The present invention relates to the field of fast charging technology, and in particular to a fast charging protection circuit and method. Background Art

[0002] Existing PD charging bases basically achieve fast charging through the USB Power Delivery (USB PD) protocol. When the host device is connected to the PD charging base, the two will perform a protocol handshake communication. After the communication is successful, the PD charging base will dynamically adjust the voltage and current according to the actual needs of the host device, thereby achieving fast charging.

[0003] In most cases, the charger power supply will always be plugged into the Type-C interface of the PD charging base, but the host device is not always placed on the PD charging base. In the prior art, the charging interface that the PD charging base contacts with the host device consists of a VBUS port and a GND port. Since the metal surface of the charging interface is exposed to the outside for a long time, when the VBUS port and the GND port are short-circuited for a long time or accidentally touched, the PD fast charging voltage is high, causing the PD SINK protocol chip to burn out, resulting in charging failure.

[0004] Therefore, the existing PD charging base has the problem of low reliability. Summary of the invention

[0005] The present invention provides a fast charging protection circuit and method, aiming to solve the problems of single charging quantity and slow charging speed in the existing battery charging stand.

[0006] In a first aspect, the present invention provides a fast charging protection circuit, the fast charging protection circuit comprising: a host circuit, a detection circuit and a charging circuit;

[0007] The host circuit includes a VBUS device interface, an ID device interface and a GND device interface; wherein the ID device interface is connected to the GND device interface;

[0008] The detection circuit includes a charging interface circuit, a PD chip and a Type-C interface, and the charging interface circuit, the PD chip and the Type-C interface are connected in sequence; wherein the detection circuit is connected to the charging circuit through the Type-C interface;

[0009] The charging interface circuit includes a VBUS charging interface, an ID charging interface and a GND charging interface. When the host circuit is connected to the detection circuit, the VBUS device interface is connected to the VBUS charging interface, and the ID charging interface, the ID device interface, the GND device interface and the GND charging interface are connected in sequence.

[0010] Furthermore, the detection circuit also includes a control circuit, and the control circuit includes the PD chip;

[0011] The voltage output end of the charging circuit is simultaneously connected to the third end of the Type-C interface, the fourth end of the Type-C interface, the third end of the control circuit, the first end of the charging interface circuit, and the first end of the host circuit;

[0012] The first end of the Type-C interface is connected to the first end of the control circuit, and the second end of the Type-C interface is connected to the second end of the control circuit; wherein the fourth pin of the PD chip serves as the first end of the control circuit, and the fifth pin of the PD chip serves as the second end of the control circuit;

[0013] The ID device interface serves as the second end of the host circuit, the ID charging interface serves as the second end of the charging interface circuit, and the second end of the charging interface circuit is respectively connected to the first end of the control circuit and the second end of the control circuit.

[0014] Further, the Type-C interface includes a first connector; wherein the second pin of the first connector serves as the first end of the Type-C interface, the third pin of the first connector serves as the second end of the Type-C interface, the first pin of the first connector serves as the third end of the Type-C interface, and the fourth pin of the first connector serves as the fourth end of the Type-C interface.

[0015] Furthermore, the control circuit further includes a first pull-down resistor and a second pull-down resistor;

[0016] The second end of the charging interface circuit is connected to the second end of the first pull-down resistor and the second end of the second pull-down resistor at the same time, the first end of the first pull-down resistor is connected to the fourth pin of the PD chip, and the first end of the second pull-down resistor is connected to the fifth pin of the PD chip.

[0017] Furthermore, the control circuit also includes a first resistor, a second resistor and a capacitor;

[0018] One end of the first resistor is connected to the sixth pin of the PD chip, the other end of the first resistor is connected to the first pin of the PD chip, and the connection points are respectively connected to the first end of the second resistor and the first end of the capacitor, and the second end of the capacitor is connected to the second pin of the PD chip and grounded; wherein the second end of the second resistor serves as the third end of the control circuit.

[0019] Further, the charging interface circuit includes a second connector, the first pin of the second connector is connected to the second pin, and the connection point thereof serves as the first end of the charging interface circuit; wherein the first end of the charging interface circuit serves as the VBUS charging interface;

[0020] The third pin of the second connector serves as the second end of the charging interface circuit; wherein the second end of the charging interface circuit serves as the ID charging interface;

[0021] The fourth pin of the second connector is connected to the fifth pin, and the connection point is grounded and serves as the GND charging interface.

[0022] Further, the host circuit includes a third connector, a fifth pin of the third connector is connected to the fourth pin, the connection point is grounded and serves as a GND device interface of the host circuit, and a third pin of the third connector serves as an ID device interface of the host circuit;

[0023] The second pin of the third connector is connected to the first pin, and the connection point serves as the first end of the host circuit; wherein the first end of the host circuit serves as the VBUS device interface.

[0024] In a second aspect, an embodiment of the present invention further provides a fast charging protection method, which is applied to the PD chip of the fast charging protection circuit in the first aspect above, and the method includes:

[0025] If it is detected that the host circuit is connected to the detection circuit, a fast charging signal is sent to the charging circuit through the Type-C interface, so that the charging circuit enters a fast charging state according to the received fast charging signal to fast charge the host circuit.

[0026] Furthermore, if it is detected that the host circuit is disconnected from the detection circuit, a slow charging signal is sent to the charging circuit through the Type-C interface, so that the charging circuit enters a slow charging state according to the received slow charging signal.

[0027] The present invention discloses a fast charging protection circuit and method, the fast charging protection circuit comprising: a host circuit, a detection circuit and a charging circuit; the host circuit comprises a VBUS device interface, an ID device interface and a GND device interface; wherein the ID device interface is connected to the GND device interface; the detection circuit comprises a charging interface circuit, a PD chip and a Type-C interface, and the charging interface circuit, the PD chip and the Type-C interface are connected in sequence; wherein the detection circuit is connected to the charging circuit through the Type-C interface; the charging interface circuit comprises a VBUS charging interface, an ID charging interface and a GND charging interface, and when the host circuit is connected to the detection circuit, the VBUS device interface is connected to the VBUS charging interface, and the ID charging interface, the ID device interface, the GND device interface and the GND charging interface are connected in sequence. The PD chip in the embodiment of the present invention is used to detect whether the host device is connected to the charging base. When it is detected that the host device is connected to the charging base, a fast charging signal is sent to the charging circuit through the Type-C interface to enable the charging circuit to enter the fast charging state from the slow charging state, thereby realizing fast charging of the host device; when the host device is not connected to the charging base, the charging circuit will automatically switch to the slow charging state, which can effectively prevent the PD chip from burning out due to the high PD fast charging voltage, thereby improving the safety and reliability of the use of the charging base. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0029] Figure 1 is a schematic diagram of a fast charging protection circuit provided by an embodiment of the present invention;

[0030] Figure 2 is a partial circuit schematic diagram of a fast charging protection circuit provided by an embodiment of the present invention;

[0031] Figure 3 is a circuit schematic diagram of a host circuit provided by an embodiment of the present invention;

[0032] Figure 4 is a schematic diagram of a fast charging protection device provided in one embodiment of the present invention.

[0033] Among them, the reference numerals in the figures are as follows:

[0034] 10. Fast charging protection circuit; 11. Host circuit; J14. Third connector; 12. Detection circuit; 121. Charging interface circuit; J2. Second connector; 122. Type-C interface; J1. First connector; 123. Control circuit; U1. PD chip; R14. First pull-down resistor; R13. Second pull-down resistor; R12. First resistor; R11. Second resistor; C11. Capacitor; 13. Charging circuit; 20. Fast charging protection device; 21. Host device; 22. Charging base; 23. PD charger; D11. First Zener diode; D12. Second Zener diode. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0037] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0038] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0039] See also Figures 1 to 3 , Figure 1 is a schematic diagram of a fast charging protection circuit provided by an embodiment of the present invention; Figure 2 is a partial circuit schematic diagram of a fast charging protection circuit provided by an embodiment of the present invention; Figure 3It is a circuit schematic diagram of a host circuit provided by an embodiment of the present invention. The present invention proposes a fast charging protection circuit 10, the fast charging protection circuit 10 includes: a host circuit 11, a detection circuit 12 and a charging circuit 13; the host circuit 11 includes a VBUS device interface, an ID device interface and a GND device interface; wherein the ID device interface is connected to the GND device interface; the detection circuit 12 includes a charging interface circuit 121, a PD chip U1 and a Type-C interface 122, and the charging interface circuit 121, the PD chip U1 and the Type-C interface 122 are connected in sequence; wherein the detection circuit 12 is connected to the charging circuit 13 through the Type-C interface 122; the charging interface circuit 121 includes a VBUS charging interface, an ID charging interface and a GND charging interface, when the host circuit 11 is connected to the detection circuit 12, the VBUS device interface is connected to the VBUS charging interface, and the ID charging interface, the ID device interface, the GND device interface and the GND charging interface are connected in sequence.

[0040] In this embodiment, the fast charge protection circuit 10 is configured in a fast charge protection device 20, and the fast charge protection device 20 includes a host device 21, a charging base 22 and a PD charger 23; the host device 21 is provided with the host circuit 11, the charging base 22 is provided with the detection circuit 12, and the PD charger 23 is provided with the charging circuit 13 (for details, please refer to Figure 4 ).

[0041] The host circuit 11 includes a VBUS device interface, an ID device interface and a GND device interface; wherein the ID device interface is connected to the GND device interface; the detection circuit 12 includes a charging interface circuit 121, a PD chip U1 and a Type-C interface 122, and the charging interface circuit 121, the PD chip U1 and the Type-C interface 122 are connected in sequence; wherein the detection circuit 12 is connected to the charging circuit 13 through the Type-C interface 122; the charging interface circuit 121 includes a VBUS charging interface, an ID charging interface and a GND charging interface. When the host circuit 11 is connected to the detection circuit 12, the VBUS device interface is connected to the VBUS charging interface, the ID charging interface, the ID device interface, the GND device interface and the GND charging interface are connected in sequence. Since the ID device interface is connected to When the GND device interface is connected, the host circuit 11 will transmit a low-level signal to the detection circuit 12. When the detection circuit 12 detects the low-level signal, it will send a fast-charging signal to the charging circuit 13 through the Type-C interface 122, so that the charging circuit 13 enters the fast-charging state according to the received fast-charging signal to fast-charge the host circuit 11; when the host circuit 11 is not connected to the detection circuit 12, the level signal detected by the detection circuit 12 is a high level. When the detection circuit 12 detects a high level, it will send a slow-charging signal to the charging circuit 13 through the Type-C interface 122, so that the charging circuit 13 enters the slow-charging state according to the received slow-charging signal, thereby realizing automatic switching of the charging state, which can effectively prevent the PD chip U1 from burning out due to the high PD fast-charging voltage, and improve the safety and reliability of the use of the charging base 22.

[0042] In one embodiment, if Figures 1 to 3As shown, the detection circuit 12 also includes a control circuit 123, and the control circuit 123 includes the PD chip U1; the voltage output end of the charging circuit 13 is simultaneously connected to the third end of the Type-C interface 122, the fourth end of the Type-C interface 122, the third end of the control circuit 123, the first end of the charging interface circuit 121 and the first end of the host circuit 11; the first end of the Type-C interface 122 is connected to the first end of the control circuit 123, and the second end of the Type-C interface 122 is connected to the second end of the control circuit 123; wherein the fourth pin of the PD chip U1 serves as the first end of the control circuit 123, and the fifth pin of the PD chip U1 serves as the second end of the control circuit 123; the ID device interface serves as the second end of the host circuit 11, the ID charging interface serves as the second end of the charging interface circuit 121, and the second end of the charging interface circuit 121 is respectively connected to the first end of the control circuit 123 and the second end of the control circuit 123.

[0043] In this embodiment, the voltage output end of the charging circuit 13 is connected to the third end of the Type-C interface 122 and the fourth end of the Type-C interface 122 at the same time. When the third end of the Type-C interface 122 is connected to the positive end of the voltage output end, the fourth end of the Type-C interface 122 is connected to the negative end of the voltage output end; the voltage output end of the charging circuit 13 is connected to the third end of the control circuit 123, the first end of the charging interface circuit 121 and the first end of the host circuit 11; the first end of the Type-C interface 122 is connected to the first end of the control circuit 123, and the second end of the Type-C interface 122 is connected to the second end of the control circuit 123; wherein the fourth pin of the PD chip U1 serves as the first end of the control circuit 123, and the fifth pin of the PD chip U1 serves as the second end of the control circuit 123; the ID device interface serves as the second end of the host circuit 11, the ID charging interface serves as the second end of the charging interface circuit 121, and the second end of the charging interface circuit 121 They are respectively connected to the first end of the control circuit 123 and the second end of the control circuit 123; specifically, the voltage output end can provide the control circuit 123 with a working voltage through the Type-C interface 122, and the control circuit 123 can detect whether the host device 21 is placed on the charging base 22 through the charging interface circuit 121. When the control circuit 123 detects that the host device 21 is placed on the charging base 22, it will send a fast charging signal to the charging circuit 13 through the Type-C interface 122, so that the charging circuit 13 enters a fast charging state according to the received fast charging signal to fast charge the host circuit 11; when the host device 21 is not placed on the charging base 22, the detection circuit 12 will send a slow charging signal to the charging circuit 13 through the Type-C interface 122, so that the charging circuit 13 enters a slow charging state according to the received slow charging signal, thereby realizing automatic switching of the charging state, which can effectively prevent the PD chip U1 from burning out due to the high PD fast charging voltage, and improve the safety and reliability of the use of the charging base 22.

[0044] In one embodiment, if Figure 1 and Figure 2 As shown, the Type-C interface 122 includes a first connector J1; wherein the second pin of the first connector J1 serves as the first end of the Type-C interface 122, the third pin of the first connector J1 serves as the second end of the Type-C interface 122, the first pin of the first connector J1 serves as the third end of the Type-C interface 122, and the fourth pin of the first connector J1 serves as the fourth end of the Type-C interface 122.

[0045] In this embodiment, the Type-C interface 122 includes a first connector J1; wherein the second pin of the first connector J1 is connected to the first end of the control circuit 123 as the first end of the Type-C interface 122, and the third pin of the first connector J1 is connected to the second end of the control circuit 123 as the second end of the Type-C interface 122, thereby realizing automatic switching of the charging state.

[0046] The first pin of the first connector J1 is connected to the voltage output end of the charging circuit 13 as the third end of the Type-C interface 122, and the fourth pin of the first connector J1 is connected to the voltage output end of the charging circuit 13 as the fourth end of the Type-C interface 122.

[0047] In one embodiment, if Figure 1 and Figure 2 As shown, the control circuit 123 also includes a first pull-down resistor R14 and a second pull-down resistor R13; the second end of the charging interface circuit 121 is connected to the second end of the first pull-down resistor R14 and the second end of the second pull-down resistor R13 at the same time, the first end of the first pull-down resistor R14 is connected to the fourth pin of the PD chip U1, and the first end of the second pull-down resistor R13 is connected to the fifth pin of the PD chip U1.

[0048] In this embodiment, the control circuit 123 also includes a first pull-down resistor R14 and a second pull-down resistor R13; the second end of the charging interface circuit 121 is connected to the second end of the first pull-down resistor R14 and the second end of the second pull-down resistor R13 at the same time, the first end of the first pull-down resistor R14 is connected to the fourth pin of the PD chip U1, and the first end of the second pull-down resistor R13 is connected to the fifth pin of the PD chip U1; the first pull-down resistor R14 and the second pull-down resistor R13 are both used to transmit sensor information and control When the host circuit 11 is connected to the detection circuit 12, a level signal is generated, and the generated level signal is transmitted to the control circuit 123 through the first pull-down resistor R14 and the second pull-down resistor R13 respectively. When the level signal detected by the control circuit 123 is a low level signal, a fast charge signal is sent to the charging circuit 13 through the Type-C interface 122, so that the charging circuit 13 enters the fast charge state according to the received fast charge signal to fast charge the host circuit 11. The embodiment of the present invention can improve the safety and reliability of the use of the charging base by setting the first pull-down resistor R14 and the second pull-down resistor R13.

[0049] In one embodiment, if Figure 1 and Figure 2 As shown, the control circuit 123 also includes a first resistor R12, a second resistor R11 and a capacitor C11; one end of the first resistor R12 is connected to the sixth pin of the PD chip U1, and the other end of the first resistor R12 is connected to the first pin of the PD chip U1, and the connection points are respectively connected to the first end of the second resistor R11 and the first end of the capacitor C11, and the second end of the capacitor C11 is connected to the second pin of the PD chip U1 and grounded; wherein the second end of the second resistor R11 serves as the third end of the control circuit 123.

[0050] In this embodiment, the control circuit 123 also includes a first resistor R12, a second resistor R11 and a capacitor C11; one end of the first resistor R12 is connected to the sixth pin of the PD chip U1, and the other end of the first resistor R12 is connected to the first pin of the PD chip U1, and the connection points are respectively connected to the first end of the second resistor R11 and the first end of the capacitor C11, and the second end of the capacitor C11 is connected to the second pin of the PD chip U1 and grounded to prevent the line from short circuiting and ensure the stable operation of the line; wherein, the second end of the second resistor R11 serves as the third end of the control circuit 123.

[0051] In one embodiment, if Figure 1 and Figure 2 As shown, the charging interface circuit 121 includes a second connector J2, the first pin of the second connector J2 is connected to the second pin, and the connection point thereof serves as the first end of the charging interface circuit 121; wherein the first end of the charging interface circuit 121 serves as the VBUS charging interface; the third pin of the second connector J2 serves as the second end of the charging interface circuit 121; wherein the second end of the charging interface circuit 121 serves as the ID charging interface; the fourth pin of the second connector J2 is connected to the fifth pin, and the connection point thereof is grounded and serves as the GND charging interface.

[0052] In this embodiment, the charging interface circuit 121 includes a second connector J2, and the first pin of the second connector J2 is connected to the second pin, and the connection point serves as the first end of the charging interface circuit 121; wherein, the first end of the charging interface circuit 121 serves as the VBUS charging interface, and when the host device 21 is placed on the charging base 22, the VBUS charging interface is connected to the VBUS device interface to realize fast charging of the host device 21.

[0053] The third pin of the second connector J2 serves as the second end of the charging interface circuit 121; wherein, the second end of the charging interface circuit 121 serves as the ID charging interface; when the host device 21 is placed on the charging base 22, the ID charging interface, the ID device interface, the GND device interface and the GND charging interface are connected in sequence. Since the ID device interface is connected to the GND device interface, the host circuit 11 will transmit a low-level signal to the detection circuit 12. When the detection circuit 12 detects the low-level signal, it will send a fast charging signal to the charging circuit 13 through the Type-C interface 122, so that the charging circuit 13 enters the fast charging state according to the received fast charging signal to fast charge the host circuit 11.

[0054] The fourth pin of the second connector J2 is connected to the fifth pin, and the connection point is grounded and serves as the GND charging interface. When the host device 21 is placed on the charging base 22, the GND charging interface is connected to the GND device interface, which can improve the safety of line operation.

[0055] In one embodiment, if Figures 1 to 3 As shown, the host circuit 11 includes a third connector J14, the fifth pin of the third connector J14 is connected to the fourth pin, the connection point is grounded and serves as the GND device interface of the host circuit 11, and the third pin of the third connector J14 serves as the ID device interface of the host circuit 11; the second pin of the third connector J14 is connected to the first pin, and the connection point serves as the first end of the host circuit 11; wherein the first end of the host circuit 11 serves as the VBUS device interface.

[0056] In this embodiment, the host circuit 11 includes a third connector J14, the fifth pin of the third connector J14 is connected to the fourth pin, the connection point is grounded and serves as the GND device interface of the host circuit 11, when the host circuit 11 is connected to the detection circuit 12, the GND device interface is connected to the GND charging interface; the third pin of the third connector J14 serves as the ID device interface of the host circuit 11, the ID device interface serves as the second end of the host circuit 11, when the host device 21 is placed on the charging base 22, the ID device interface is connected to the ID charging interface (that is, the second end of the host circuit 11 is connected to the second end of the charging interface circuit 121); the second pin of the third connector J14 is connected to the first pin, and the connection point serves as the first end of the host circuit 11; wherein, the first end of the host circuit 11 serves as the VBUS device interface, when the host device 21 is placed on the charging base 22, the VBUS device interface is connected to the VBUS charging interface (that is, the first end of the host circuit 11 is connected to the first end of the charging interface circuit 121).

[0057] When the host circuit 11 is connected to the detection circuit 12, the VBUS device interface is connected to the VBUS charging interface, and the ID charging interface, the ID device interface, the GND device interface and the GND charging interface are connected in sequence. Since the ID device interface is connected to the GND device interface, the host circuit 11 transmits a low-level signal to the detection circuit 12. When the detection circuit 12 detects the low-level signal, it sends a fast-charging signal to the charging circuit 13 through the Type-C interface 122, so that the charging circuit 13 can charge according to the connection. The received fast charging signal enters the fast charging state to fast charge the host circuit 11; when the host circuit 11 is not connected to the detection circuit 12, the level signal detected by the detection circuit 12 is a high level. When the detection circuit 12 detects a high level, it will send a slow charging signal to the charging circuit 13 through the Type-C interface 122, so that the charging circuit 13 enters the slow charging state according to the received slow charging signal, and realizes automatic switching of the charging state, which can effectively prevent the PD chip U1 from burning out due to the high PD fast charging voltage, and improve the safety and reliability of the use of the charging base 22.

[0058] In one embodiment, if Figure 2As shown, the fast charging protection circuit also includes a first voltage zener diode D11 and a second voltage zener diode D12; the voltage output end of the charging circuit 13 is respectively connected to the cathode of the first voltage zener diode D11 and the cathode of the second voltage zener diode D12, and the anode of the first voltage zener diode D11 and the anode of the second voltage zener diode D12 are both grounded.

[0059] In this embodiment, the fast charging protection circuit also includes a first voltage zener diode D11 and a second voltage zener diode D12, and the first voltage zener diode D11 and the second voltage zener diode D12 both play a role in stabilizing the voltage; the voltage output end of the charging circuit 13 is respectively connected to the cathode of the first voltage zener diode D11 and the cathode of the second voltage zener diode D12, and the anode of the first voltage zener diode D11 and the anode of the second voltage zener diode D12 are both grounded, which can improve the safety and stability of the line operation.

[0060] A fast charging protection method is also provided in an embodiment of the present invention, which is applied to the PD chip of the above-mentioned fast charging protection circuit. The method includes: if it is detected that the host circuit is connected to the detection circuit, a fast charging signal is sent to the charging circuit through the Type-C interface, so that the charging circuit enters a fast charging state according to the received fast charging signal to fast charge the host circuit.

[0061] In this embodiment, the host circuit includes a VBUS device interface, an ID device interface and a GND device interface; wherein the ID device interface is connected to the GND device interface; the detection circuit includes a charging interface circuit, a PD chip and a Type-C interface, and the charging interface circuit, the PD chip and the Type-C interface are connected in sequence; wherein the detection circuit is connected to the charging circuit through the Type-C interface; the charging interface circuit includes a VBUS charging interface, an ID charging interface and a GND charging interface. When the host circuit is connected to the detection circuit, the VBUS device interface is connected to the VBUS charging interface, the ID charging interface, the ID device interface, the GND device interface and the GND charging interface are connected in sequence. The host device interface is connected to the GND device interface, the host circuit transmits a low-level signal to the detection circuit. When the detection circuit detects the low-level signal, it sends a fast-charging signal to the charging circuit through the Type-C interface, so that the charging circuit enters a fast-charging state according to the received fast-charging signal to fast-charge the host circuit; when the host circuit is not connected to the detection circuit, the level signal detected by the detection circuit is a high level. When the detection circuit detects a high level, it sends a slow-charging signal to the charging circuit through the Type-C interface, so that the charging circuit enters a slow-charging state according to the received slow-charging signal, thereby realizing automatic switching of the charging state, effectively preventing the PD chip from burning out due to the high PD fast-charging voltage, and improving the safety and reliability of the use of the charging base.

[0062] In one embodiment, the method further includes: if it is detected that the host circuit is disconnected from the detection circuit, a slow charging signal is sent to the charging circuit through the Type-C interface, so that the charging circuit enters a slow charging state according to the received slow charging signal.

[0063] In this embodiment, when the ID device interface is disconnected from the ID charging interface (that is, the host circuit is not connected to the detection circuit), the level signal detected by the detection circuit is a high level. When the detection circuit detects a high level, it sends a slow charging signal to the charging circuit through the Type-C interface, so that the charging circuit enters a slow charging state according to the received slow charging signal, thereby realizing automatic switching of the charging state, which can effectively prevent the PD chip from burning out due to the high PD fast charging voltage, and improve the safety and reliability of the use of the charging base.

[0064] The present invention discloses a fast charging protection circuit and method, the fast charging protection circuit comprising: a host circuit, a detection circuit and a charging circuit; the host circuit comprises a VBUS device interface, an ID device interface and a GND device interface; wherein the ID device interface is connected to the GND device interface; the detection circuit comprises a charging interface circuit, a PD chip and a Type-C interface, and the charging interface circuit, the PD chip and the Type-C interface are connected in sequence; wherein the detection circuit is connected to the charging circuit through the Type-C interface; the charging interface circuit comprises a VBUS charging interface, an ID charging interface and a GND charging interface, and when the host circuit is connected to the detection circuit, the VBUS device interface is connected to the VBUS charging interface, and the ID charging interface, the ID device interface, the GND device interface and the GND charging interface are connected in sequence. The PD chip in the embodiment of the present invention is used to detect whether the host device is connected to the charging base. When it is detected that the host device is connected to the charging base, a fast charging signal is sent to the charging circuit through the Type-C interface to enable the charging circuit to enter the fast charging state from the slow charging state, thereby realizing fast charging of the host device; when the host device is not connected to the charging base, the charging circuit will automatically switch to the slow charging state, which can effectively prevent the PD chip from burning out due to the high PD fast charging voltage, thereby improving the safety and reliability of the use of the charging base.

[0065] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A fast charging protection circuit, characterized in that: The fast charging protection circuit includes: a host circuit, a detection circuit and a charging circuit; The host circuit includes a VBUS device interface, an ID device interface and a GND device interface; wherein the ID device interface is connected to the GND device interface; The detection circuit includes a charging interface circuit, a PD chip and a Type-C interface, and the charging interface circuit, the PD chip and the Type-C interface are connected in sequence; wherein the detection circuit is connected to the charging circuit through the Type-C interface; The charging interface circuit includes a VBUS charging interface, an ID charging interface and a GND charging interface. When the host circuit is connected to the detection circuit, the VBUS device interface is connected to the VBUS charging interface, and the ID charging interface, the ID device interface, the GND device interface and the GND charging interface are connected in sequence.

2. The fast charge protection circuit according to claim 1, characterized in that: The detection circuit also includes a control circuit, and the control circuit includes the PD chip; The voltage output end of the charging circuit is simultaneously connected to the third end of the Type-C interface, the fourth end of the Type-C interface, the third end of the control circuit, the first end of the charging interface circuit, and the first end of the host circuit; The first end of the Type-C interface is connected to the first end of the control circuit, and the second end of the Type-C interface is connected to the second end of the control circuit; wherein the fourth pin of the PD chip serves as the first end of the control circuit, and the fifth pin of the PD chip serves as the second end of the control circuit; The ID device interface serves as the second end of the host circuit, the ID charging interface serves as the second end of the charging interface circuit, and the second end of the charging interface circuit is respectively connected to the first end of the control circuit and the second end of the control circuit.

3. The fast charge protection circuit according to claim 2, characterized in that: The Type-C interface includes a first connector; wherein the second pin of the first connector serves as the first end of the Type-C interface, the third pin of the first connector serves as the second end of the Type-C interface, the first pin of the first connector serves as the third end of the Type-C interface, and the fourth pin of the first connector serves as the fourth end of the Type-C interface.

4. The fast charge protection circuit according to claim 2, characterized in that: The control circuit also includes a first pull-down resistor and a second pull-down resistor; The second end of the charging interface circuit is connected to the second end of the first pull-down resistor and the second end of the second pull-down resistor at the same time, the first end of the first pull-down resistor is connected to the fourth pin of the PD chip, and the first end of the second pull-down resistor is connected to the fifth pin of the PD chip.

5. The fast charge protection circuit according to claim 2, characterized in that: The control circuit also includes a first resistor, a second resistor and a capacitor; One end of the first resistor is connected to the sixth pin of the PD chip, the other end of the first resistor is connected to the first pin of the PD chip, and the connection points are respectively connected to the first end of the second resistor and the first end of the capacitor, and the second end of the capacitor is connected to the second pin of the PD chip and grounded; wherein the second end of the second resistor serves as the third end of the control circuit.

6. The fast charge protection circuit according to claim 2, characterized in that: The charging interface circuit includes a second connector, a first pin of the second connector is connected to a second pin, and the connection point serves as a first end of the charging interface circuit; wherein the first end of the charging interface circuit serves as the VBUS charging interface; The third pin of the second connector serves as the second end of the charging interface circuit; wherein the second end of the charging interface circuit serves as the ID charging interface; The fourth pin of the second connector is connected to the fifth pin, and the connection point is grounded and serves as the GND charging interface.

7. The fast charge protection circuit according to claim 2, characterized in that: The host circuit comprises a third connector, a fifth pin of the third connector is connected to a fourth pin, a connection point thereof is grounded and serves as a GND device interface of the host circuit, and a third pin of the third connector serves as an ID device interface of the host circuit; The second pin of the third connector is connected to the first pin, and the connection point serves as the first end of the host circuit; wherein the first end of the host circuit serves as the VBUS device interface.

8. The fast charge protection circuit according to claim 1, characterized in that: The fast charge protection circuit also includes a first voltage stabilizing diode and a second voltage stabilizing diode; The voltage output end of the charging circuit is connected to the cathode of the first voltage zener diode and the cathode of the second voltage zener diode respectively, and the anode of the first voltage zener diode and the anode of the second voltage zener diode are both grounded.

9. A fast charging protection method, characterized in that: The method is applied to the PD chip of the fast charging protection circuit described in any one of claims 1 to 8, and is characterized in that the method comprises: If it is detected that the host circuit is connected to the detection circuit, a fast charging signal is sent to the charging circuit through the Type-C interface, so that the charging circuit enters a fast charging state according to the received fast charging signal to fast charge the host circuit.

10. The fast charge protection method according to claim 9, characterized in that: After sending the fast charging signal to the charging circuit through the Type-C interface, the method further includes: If it is detected that the host circuit is disconnected from the detection circuit, a slow charging signal is sent to the charging circuit through the Type-C interface, so that the charging circuit enters a slow charging state according to the received slow charging signal.

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