Pin protection circuit and TYPE-C connector
By designing a pin protection circuit and utilizing the cooperation of logic and feedback modules, a complete shutdown was achieved when the Type-C interface pins were short-circuited, solving the problem of excessive current caused by short circuits in the CC and Vbus pins and protecting the terminal equipment.
Patent Information
- Application Number
- CN202423104950.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2034-12-13
AI Technical Summary
In existing technologies, short-circuiting the CC and Vbus pins of the Type-C interface can lead to excessive current, causing damage to the connectors of terminal electrical equipment.
A pin protection circuit was designed, including a logic module, a shutdown module, and a signal interface. The logic module outputs a shutdown voltage to control the shutdown module to disconnect the pin connection, and the feedback module feeds back a high level to the logic module to completely shut down the power input, thereby achieving complete shutdown of the circuit.
This effectively avoids excessive current caused by short circuits in the CC and Vbus pins, protects the terminal equipment connectors, and prevents damage caused by incomplete circuit shutdown.
Smart Images
Figure CN223744364U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of circuit protection especially relates to a pin protection circuit and TYPE C connector. BACKGROUND
[0002] USB Type-C is a kind of USB interface appearance standard, can be applied to PC and can be applied to the interface type of external device.Type-C port integrates signal transmission and power supply, supports multiple protocols and has strong compatibility, and Type-C interface is widely applied based on the above-mentioned advantages, however, under its compact design, the spacing between pin and pin is very small, thus increasing the potential risk of CC and Vbus short circuit, after CC pin and Vbus pin short circuit, due to excessive current, TYPE-C plug may be damaged, and terminal product is heated.
[0003] The protection method taken by the existing scheme after pin short circuit is all hiccup mode, when the switch power supply detects output short circuit, hiccup mode starts, and the power supply chip will work for several hundred milliseconds and then stop working for several seconds, and continuously circulates until the short circuit fault is eliminated.However, the hiccup mode of the prior art does not completely turn off the circuit, and under long-term short circuit state, due to the small area of CCPIN pin, excessive current will cause PIN pin to be red, and finally still make DC plug of charger burn out, finally leading to damage of terminal electrical equipment connector. UTILITY MODEL CONTENTS
[0004] The main purpose of the utility model is to solve the technical problem that the current CC and Vbus short circuit state leads to damage of terminal electrical equipment connector.
[0005] The utility model provides a kind of pin protection circuit, and the pin protection circuit includes first logic module, shutdown module and signal interface, the first pin and second pin are configured in the signal interface, the first logic module called pin includes CC1 pin and GATE pin;
[0006] The input end of the shutdown module is coupled with the GATE pin;
[0007] The CC1 pin is coupled with the first pin;
[0008] When the CC1 pin responds to the high level of the first pin, the GATE pin of the first logic module outputs shutdown voltage;
[0009] The shutdown module disconnects the pin protection circuit in response to the shutdown voltage, to disconnect the electrical connection of the first pin and the second pin.
[0010] Optionally, the shutdown module comprises a switch unit and a second resistor, a first end of the second resistor is coupled with a GATE pin of the first logic module, and a second end of the second resistor is coupled with an input end of the switch unit.
[0011] Optionally, the pin protection circuit further comprises a feedback module and a second logic module, a pin called by the second logic module comprises a COMP pin, an input end of the feedback module is coupled with a CATH pin of the first logic module, and an output end of the feedback module is coupled with the COMP pin of the second logic module, and the high level is fed back to the second logic module.
[0012] Optionally, the feedback module comprises a first unit and a third resistor, the first unit comprises a fourth resistor and a photoelectric coupler, a first end of the fourth resistor is coupled with the CATH pin of the first logic module, a second end of the fourth resistor is coupled with a first end of the photoelectric coupler, a second end of the photoelectric coupler is coupled with the COMP pin of the second logic module, a first end of the third resistor is coupled with an input end of the first unit, and a second end of the third resistor is coupled with an output end of the first unit.
[0013] Optionally, the pin protection circuit further comprises an integrated circuit protection module, a third pin is further configured in the signal interface, the integrated circuit protection module comprises a clamping unit and a protection unit, an input end of the clamping unit is coupled with the third pin, an output end of the clamping unit is coupled with the first pin, and the clamping unit, in response to the high level, pulls down the high level of the first pin according to a low level of the third pin.
[0014] Optionally, the pin called by the first logic module further comprises an IS pin and a GPIO5 pin, the protection unit further comprises a fifth resistor and a sub-unit, a first end of the fifth resistor is coupled with the IS pin of the first logic module, a second end of the fifth resistor is coupled with the third pin, a first end of the sub-unit is coupled with the GPIO5 pin of the first logic module, and a second end of the sub-unit is coupled with a ground wire.
[0015] Optionally, the sub-unit comprises a sixth resistor and a thermistor, a first end of the sixth resistor is coupled with the ground wire, a second end of the sixth resistor is coupled with a first end of the thermistor, and a second end of the thermistor is coupled with the GPIO5 pin of the first logic module.
[0016] Optionally, the pin protection circuit further comprises a first resistor, a first end of the first resistor is coupled with a CC1 pin of the first logic module, and a second end of the first resistor is coupled with the first pin.
[0017] The utility model discloses a second aspect provides a kind of TYPE-C connector, the TYPE-C connector includes pin protection circuit, the TYPE-C connector further include AC voltage input module, EMI filter module, input rectification filter module, output rectification filter module, power control switch module, PWM power supply module, PWM control module and DC output voltage module.
[0018] Optionally, the AC voltage output module is coupled with the EMI filter module, the EMI filter module is coupled with the input rectification filter module, the input rectification filter module is coupled with the output rectification filter module, the output rectification filter module is coupled with the first end of the shutdown module, the second end of the shutdown module is coupled with the DC output voltage module, the DC output voltage module is coupled with the second pin, the power control switch module is coupled with the first end of the second logic module, the PWM control module is coupled with the second end of the second logic module, and the PWM control module is coupled with the PWM power supply module.
[0019] In the pin protection circuit of the utility model embodiment, the shutdown voltage is output through the logic module to control the shutdown module to disconnect the pin protection circuit, and the output is directly turned off, so that the voltage in the circuit is completely turned off to zero, and the technical problem that the terminal power equipment connector is damaged due to excessive current caused by short circuit between the CC pin and the Vbus pin is solved. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 A schematic diagram of the pin protection circuit provided in the utility model embodiment is shown in the figure.
[0021] Figure 2 A circuit diagram of the shutdown module provided in the utility model embodiment is shown in the figure.
[0022] Figure 3 A circuit diagram of the feedback module provided in the utility model embodiment is shown in the figure.
[0023] Figure 4 A circuit diagram of the integrated circuit protection module provided in the utility model embodiment is shown in the figure.
[0024] Figure 5 A schematic diagram of the TYPE-C connector provided in the utility model embodiment is shown in the figure. DETAILED DESCRIPTION
[0025] The utility model embodiment provides a pin protection circuit.
[0026] Embodiments of the present disclosure will be described below in greater detail with reference to the accompanying drawings. While certain embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms and should not be interpreted as being limited to the embodiments set forth herein, but rather, these embodiments are provided so that the present disclosure can be more thoroughly and completely understood. It is understood that the drawings and embodiments of the present disclosure are for exemplary purposes only and are not intended to limit the scope of the present disclosure.
[0027] In the description of embodiments of the present disclosure, the term "comprising" and similar terms are to be interpreted as open-ended, i.e., "including but not limited to". The term "based on" is to be interpreted as "based, at least in part, on". The term "one embodiment" or "the embodiment" is to be interpreted as "at least one embodiment". The terms "first", "second", etc. can refer to different or identical objects. Other explicit and implicit definitions can also be included below.
[0028] For ease of understanding, the specific process of the embodiments of the present disclosure is described below. Please refer to Figure 1 In an embodiment of the pin protection circuit in the embodiments of the present disclosure, the pin protection circuit comprises a first logic module, an off module and a signal interface, the signal interface is configured with a first pin and a second pin, the pin called by the first logic module comprises a CC1 pin and a GATE pin;
[0029] The input end of the off module is coupled with the GATE pin;
[0030] The CC1 pin is coupled with the first pin;
[0031] When the CC1 pin responds to the high level of the first pin, the GATE pin of the first logic module outputs an off voltage;
[0032] The off module responds to the off voltage to disconnect the pin protection circuit, so as to disconnect the electrical connection of the first pin and the second pin.
[0033] Further, the first end of the first resistor is coupled with the CC1 pin of the first logic module, and the second end of the first resistor is coupled with the first pin.
[0034] The first pin configured in the signal interface is a CC pin, and the second pin is a Vbus pin, the CC1 pin of the first logic module is coupled with the first pin, when the first pin is short-circuited with the second pin (namely the CC pin is short-circuited with the Vbus pin), the CC1 pin responds to the high level of the first pin, in a possible implementation manner, when the CC1 pin senses that the voltage of the first pin is greater than 2.7V, the first resistance detects the high level, and then the high level is transmitted to the first logic module, the off voltage is output from the GATE pin of the first logic module, the off module responds to the off voltage, and the pin protection circuit is disconnected, namely the voltage output is cut off, so that the electrical connection between the first pin and the second pin is disconnected.
[0035] Reference Figure 2 , Figure 2 The utility model embodiment provides the circuit diagram of off module. Further, the off module includes a switching unit and a second resistor, the first end of the second resistor is coupled with the GATE pin of the first logic module, and the second end of the second resistor is coupled with the input end of the switching unit.
[0036] The off module includes a switching unit and a second resistor in the utility model, the GATE pin outputs the off voltage and inputs the switching unit through the second resistor when the CC1 pin responds to the high level, on the one hand, the second resistor is used for protecting the circuit from being burnt out due to short circuit of the pin protection circuit, and on the other hand, the second resistor is used for voltage division so that the voltage output from the GATE pin is the off voltage.The switching unit is composed of a Mos tube switching circuit, the drain D is connected with the power supply, the source S is connected with the ground, and in the utility model, when the Vgs gate voltage is greater than the value in the parameter manual, the NMOS will be turned on, therefore, the utility model outputs the off voltage through the GATE pin, namely the gate voltage is pulled down so that the MOS tube cannot be turned on, the effect of cutting off the output is achieved, the pin protection circuit is disconnected, and the electrical connection between the first pin and the second pin is disconnected.
[0037] Reference Figure 3 , Figure 3 The utility model embodiment provides the circuit diagram of feedback module. Further, the feedback module includes a first unit and a third resistor, the first unit includes a fourth resistor and a photoelectric coupler, the first end of the fourth resistor is coupled with the CATH pin of the first logic module, the second end of the fourth resistor is coupled with the first end of the photoelectric coupler, the second end of the photoelectric coupler is coupled with the COMP pin of the second logic module, the first end of the third resistor is coupled with the input end of the first unit, and the second end of the third resistor is coupled with the output end of the first unit.
[0038] The pin protection circuit further includes a feedback module, the feedback module includes a first unit and a third resistor, the first unit includes a fourth resistor and a photoelectric coupler, a pin of a light emitting device of the photoelectric coupler is an input end, and a pin of a photosensitive device is an output end, the photosensitive transistor works by utilizing the principle that a reverse resistance changes from large to small under irradiation of light when a PN junction is applied with a reverse voltage. When working, an electric signal is added to the input end, a core body of the light emitting device emits light, the photosensitive device generates a photoelectric current after being irradiated with light and outputs after being amplified by an electronic circuit, electric signal conversion into optical signal is realized, and optical signal is converted into electric signal, so that electric appliance isolation of the input and output circuits is realized. Since the input and output circuits of the photoelectric coupler are mutually isolated, the electric signal has unidirectionality and other advantages during transmission, has good anti-electromagnetic wave interference capability and electric insulation capability, the photoelectric coupler is used as an element of the feedback module, a high-level signal is fed back to the second logic module from the first logic module through the photoelectric coupler, the third resistor and the fourth resistor, the second logic module outputs a turn-off voltage to control the power supply input to be disconnected, so that the current in the entire circuit is zero, and the pin protection circuit is completely turned off.
[0039] Reference Figure 4 , Figure 4 The utility model discloses an integrated circuit protection module's circuit diagram provided by the embodiment of the utility model. Further, the pin protection circuit further includes an integrated circuit protection module, a third pin is further arranged in the signal interface, the integrated circuit protection module includes a clamping unit and a protection unit, the input end of the clamping unit is coupled with the third pin, and the output end of the clamping unit is coupled with the first pin, and the clamping unit responds to the high level and pulls down the high level of the first pin according to the low level of the third pin.
[0040] The utility model discloses a third pin is further arranged in the signal interface, and the third pin is GND, and the pin protection circuit can not only protect the short circuit between CC pin and Vbus pin, but also can be used for protecting the short circuit of GND pin, when the short circuit of any two pins of the first pin, the second pin and the third pin, can disconnect the electric connection through the pin protection circuit to avoid the technical problem that the terminal electric equipment connector is damaged due to too large current caused by the short circuit between pins.
[0041] The pin protection circuit further includes an integrated circuit protection module, the integrated circuit protection module includes a clamping unit, the clamping unit is coupled with a GND pin, clamping refers to the measures for limiting the potential of a point to a specified potential, and a TVS tube generates a clamping voltage in the clamping circuit, the clamping circuit utilizes the one-way conduction characteristic of the TVS tube, when the voltage exceeds the voltage resistance of the TVS tube, the TVS tube is turned on, current flows from the negative end to the positive end, and the voltage is pulled down to the rated value of the TVS tube, so that the voltage at the first pin end is pulled down, and the problem of excessive voltage in the circuit is avoided, and the terminal equipment is prevented from being burnt out.
[0042] Further, the pin called by the first logic module further includes an IS pin and a GPIO5 pin, the protection unit further includes a fifth resistor and a subunit, a first end of the fifth resistor is coupled with the IS pin of the first logic module, a second end of the fifth resistor is coupled with the third pin, a first end of the subunit is coupled with the GPIO5 pin of the first logic module, and a second end of the subunit is coupled with a ground wire.
[0043] Further, the subunit includes a sixth resistor and a thermistor, a first end of the sixth resistor is coupled with the ground wire, a second end of the sixth resistor is coupled with a first end of the thermistor, and a second end of the thermistor is coupled with the GPIO5 pin of the first logic module.
[0044] The integrated circuit protection module further includes a protection unit, the protection unit includes a fifth resistor and a subunit, the subunit includes a sixth resistor and a thermistor, and the sixth resistor and the thermistor play a role in over-temperature protection, since the GPIO5 pin of the first logic module has low voltage resistance, the protection unit is arranged to play a role in protecting the first logic module. The integrated circuit protection module is mainly used for protecting elements and preventing the MCU from being burnt out.
[0045] Reference Figure 5 , Figure 5 is a schematic view of a TYPE-C connector.
[0046] In addition to the pin protection circuit, the TYPE-C connector further includes an AC voltage input module, an EMI filtering module, an input rectification filtering module, an output rectification filtering module, a power control switch module, a PWM power supply module, a PWM control module and a DC output voltage module.
[0047] Further, the AC voltage output module is coupled with the EMI filter module, the EMI filter module is coupled with the input rectification filter module, the input rectification filter module is coupled with the output rectification filter module, the output rectification filter module is coupled with the first end of the shutdown module, the second end of the shutdown module is coupled with the DC output voltage module, the DC output voltage module is coupled with the second pin, the power control switch module is coupled with the first end of the second logic module, the PWM control module is coupled with the second end of the second logic module, and the PWM control module is coupled with the PWM power supply module.
[0048] The utility model provides a TYPE C connector, the seat son removes the pin protection circuit still couples other module, including AC voltage input module for to the TYPE C connector power supply, EMI filter module for to the frequency point of specific frequency in power supply or the frequency outside this frequency point carries out effective filtration, obtains a specific frequency power supply signal, or eliminates a specific frequency power supply signal, rectification filter module for converting into DC into AC, through rectification transformer reduces pressure and becomes low voltage AC through filter capacitor low voltage AC becomes stable DC output, simultaneously still removes the noise and fluctuation in current in the process of filtering, make the current of output more stable, power control switch module for through the trigger control of thyristor realizes the accurate control to the power in the circuit, PWM power supply module for based on the modulation of signal width, through the duty ratio of signal change control output voltage, PWM control module for through the change pulse width control motor's rotating speed, realizes the accurate control of motor, DC output voltage module for connecting in the pin protection circuit after, to the DC voltage of conversion output.
[0049] In the utility model, on one hand, the shutdown module is responsive to the high level and outputs a shutdown voltage to shut down the switch unit by the first logic module, so as to disconnect the output and disconnect the electrical connection between the first pin and the second pin, on the other hand, the feedback module is responsive to the high level, feeds back the high level to the second logic module, controls the shutdown power input by the second logic module, so as to disconnect the input and protect the entire circuit and terminal equipment.
[0050] Compared with the existing technology, the belch mode does not completely turn off the circuit, and in the long-term short-circuit state, due to the small area of the CCPIN pin, the excessive current will cause the PIN pin to be red, and finally the DC plug of the charger will be burned out, and finally the damage of the terminal power equipment connector will be caused. The utility model discloses through the shutdown output and the shutdown input let whole pin protection circuit completely shut down, protected the input power and terminal equipment, let whole circuit voltage current be zero, can thoroughly disconnect the electric connection between the first pin and the second pin, thereby avoiding the damage of the terminal power equipment connector.
[0051] Furthermore, although various operations can be described in a particular, sequential order, this should not be understood as requiring such that the operations be performed in the described order, or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing can be advantageous. Likewise, the specific sequence of operations described in the above discussion can be modified in various ways. Thus, the application should not be construed as limited to the particular order of operations set forth in the above discussion. Rather, the various implementations described above can be implemented in any order that is suitable to a particular implementation. Similarly, while the above discussion has included several specific implementations, it will be understood by those skilled in the art that the broad description above is intended to encompass any and all implementations within the scope of the following claims. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable sub-combination. Although the subject matter has been described in language specific to structural features and / or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.
[0052] Although the subject matter has been described in language specific to structural features and / or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.
Claims
1. A pin protection circuit, characterized by, The pin protection circuit comprises a first logic module, an off module and a signal interface, the signal interface is configured with a first pin and a second pin, the pin called by the first logic module comprises a CC1 pin and a GATE pin; The input end of the off module is coupled with the GATE pin; The CC1 pin is coupled with the first pin; When the CC1 pin responds to the high level of the first pin, the GATE pin of the first logic module outputs an off voltage; The off module responds to the off voltage to disconnect the pin protection circuit to disconnect the electrical connection of the first pin and the second pin.
2. The pin protection circuit of claim 1, wherein, The off module comprises a switch unit and a second resistor, the first end of the second resistor is coupled with the GATE pin of the first logic module, and the second end of the second resistor is coupled with the input end of the switch unit.
3. The pin protection circuit of claim 1, wherein, The pin protection circuit further comprises a feedback module and a second logic module, the pin called by the second logic module comprises a COMP pin, the input end of the feedback module is coupled with the CATH pin of the first logic module, and the output end of the feedback module is coupled with the COMP pin of the second logic module to feed back the high level to the second logic module.
4. The pin protection circuit of claim 3, wherein, The feedback module comprises a first unit and a third resistor, the first unit comprises a fourth resistor and a photoelectric coupler, the first end of the fourth resistor is coupled with the CATH pin of the first logic module, the second end of the fourth resistor is coupled with the first end of the photoelectric coupler, the second end of the photoelectric coupler is coupled with the COMP pin of the second logic module, the first end of the third resistor is coupled with the input end of the first unit, and the second end of the third resistor is coupled with the output end of the first unit.
5. The pin protection circuit of claim 1, wherein, The pin protection circuit further comprises an integrated circuit protection module, the signal interface is further configured with a third pin, the integrated circuit protection module comprises a clamping unit and a protection unit, the input end of the clamping unit is coupled with the third pin, the output end of the clamping unit is coupled with the first pin, and the clamping unit responds to the high level to pull down the high level of the first pin according to the low level of the third pin.
6. The pin protection circuit of claim 5, wherein, The pin called by the first logic module further comprises an IS pin and a GPIO5 pin, the protection unit further comprises a fifth resistor and a subunit, the first end of the fifth resistor is coupled with the IS pin of the first logic module, the second end of the fifth resistor is coupled with the third pin, the first end of the subunit is coupled with the GPIO5 pin of the first logic module, and the second end of the subunit is coupled with a ground wire.
7. The pin protection circuit of claim 6, wherein, The subunit comprises a sixth resistor and a thermistor, the first end of the sixth resistor is coupled with the ground wire, the second end of the sixth resistor is coupled with the first end of the thermistor, and the second end of the thermistor is coupled with the GPIO5 pin of the first logic module.
8. The pin protection circuit of claim 1, wherein, The pin protection circuit further comprises a first resistor, the first end of the first resistor is coupled with the CC1 pin of the first logic module, and the second end of the first resistor is coupled with the first pin.
9. A TYPE-C connector, characterized by, The TYPE-C connector comprises the pin protection circuit according to any one of claims 1-8, and further comprises an AC voltage input module, an EMI filtering module, an input rectification filtering module, an output rectification filtering module, a power control switch module, a PWM power supply module, a PWM control module and a DC output voltage module.
10. The TYPE-C connector according to claim 9, wherein, The AC voltage output module is coupled with the EMI filtering module, the EMI filtering module is coupled with the input rectification filtering module, the input rectification filtering module is coupled with the output rectification filtering module, the output rectification filtering module is coupled with the first end of the shutdown module, the second end of the shutdown module is coupled with the DC output voltage module, the DC output voltage module is coupled with the second pin, the power control switch module is coupled with the first end of the second logic module, the PWM control module is coupled with the second end of the second logic module, and the PWM control module is coupled with the PWM power supply module.