A pressure-sensing adapter

Abstract

This utility model discloses a pressure-sensing adapter, including a switching unit. The first terminal of the switching unit receives a positive power supply voltage, and the second terminal of the switching unit outputs a positive power supply voltage. A control unit is electrically connected to the control terminal of the switching unit. The output plug includes an output terminal, a pressure control circuit, and a voltage regulator. The pressure control circuit includes a comparator, a pressure setting unit, and a pressure sensing unit. The output terminal of the comparator is electrically connected to the control unit. The output terminals of the pressure setting unit and the pressure sensing unit are respectively electrically connected to the negative and positive terminals of the comparator. The voltage regulator is electrically connected to the output terminal, the second terminal of the switching unit, the pressure setting unit, and the pressure sensing unit. When the force applied to the power plug is sent to the comparator via the pressure sensor, the comparator generates a low logic signal to the control unit. The control unit then sends a low-potential signal to the switching unit based on the low logic signal to interrupt the positive power supply voltage output. This design is low-cost and highly safe.

Description

Technical Field

[0001] This utility model relates to a power failure protection circuit, and more particularly to a pressure-sensing adapter. Background Technology

[0002] Currently, the output voltage range of PD3.1 includes 5V~48V. During the use of the power adapter, when the user unplugs the DC plug, the current still flows between the metal contacts, and the momentary disconnection may cause an electric arc (sparking). This arcing can not only damage the connector's metal contacts and reduce its lifespan, but may also cause safety hazards such as poor contact, overheating, or even short circuit risks.

[0003] Existing solutions typically employ mechanical power-off switches to reduce the impact of electric arcs. However, mechanical power-off switches are prone to wear and tear, their reliability decreases over long-term use, and their response speed is slow, making it impossible to completely prevent instantaneous arcing. Therefore, there is an urgent need for a low-cost, high-reliability solution that can quickly detect and cut off the power supply at the initial stage of the user's plugging and unplugging action, thereby completely preventing the generation of electric arcs. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art by providing a pressure-sensing adapter that can quickly detect and cut off the power supply at the initial stage of the user's plugging and unplugging action, with low cost and high reliability.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a pressure-sensing adapter, comprising:

[0006] A switching unit, wherein a first terminal of the switching unit is used to receive a positive power supply voltage, a second terminal of the switching unit is used to output the positive power supply voltage, and the switching unit is used to control the on / off state of the positive power supply voltage;

[0007] A control unit is electrically connected to a control terminal of the switching unit to output a high-potential or low-potential signal to the control terminal;

[0008] One output plug, including

[0009] A pressure control circuit, including:

[0010] A comparison unit, one output of which is electrically connected to the control unit;

[0011] A pressure setting unit, wherein an output terminal of the pressure setting unit is electrically connected to the negative terminal of the comparison unit, for transmitting a first signal to the comparison unit;

[0012] A pressure sensing unit, one of whose output terminals is electrically connected to the positive terminal of the comparison unit, for transmitting a second signal to the comparison unit;

[0013] A voltage regulator unit is electrically connected to an output terminal, the second terminal of the switching unit, the pressure setting unit, and the pressure sensing unit. The voltage regulator unit is used to receive the positive power supply voltage and provide a fixed voltage to the pressure setting unit and the pressure sensing unit.

[0014] The comparison unit outputs a pressure signal to the control unit based on the first signal and the second signal; when the pressure signal is a low logic level, the control unit outputs the low-level signal, and the switching unit interrupts the output of the positive power supply voltage based on the low-level signal.

[0015] Preferably, a first resistor is provided between the switching unit and the control unit; one end of the first resistor is electrically connected to the control terminal of the switching unit, and the other end of the first resistor is electrically connected to the output terminal of the control unit.

[0016] Preferably, the comparison unit includes a comparator and a second resistor; the output terminal of the comparator is electrically connected to the first terminal of the second resistor and the input terminal of the control unit; the second terminal of the second resistor is electrically connected to the pressure sensing unit and the pressure setting unit respectively; the positive terminal and the negative terminal of the comparator are electrically connected to the pressure sensing unit and the pressure setting unit respectively; the comparator is used to output a pressure signal to the input terminal of the control unit based on the first signal and the second signal; the second resistor is used to stabilize the pressure signal.

[0017] Preferably, the pressure setting unit includes a third resistor and a fourth resistor; the third resistor and the fourth resistor are electrically connected in series, and there is a first node between the third resistor and the fourth resistor to output the first signal to the negative terminal of the comparator; the first terminal of the fourth resistor is electrically connected to the second terminal of the second resistor.

[0018] Preferably, the pressure sensing unit includes a fifth resistor and a pressure sensor; the fifth resistor and the pressure sensor are electrically connected in series, and a second node is provided between the fifth resistor and the pressure sensor to output the second signal to the positive terminal of the comparator; the first terminal of the fifth resistor is electrically connected to the second terminal of the second resistor.

[0019] Preferably, the first end of the sixth resistor is electrically connected to the output terminal and the second end of the switching unit; the second end of the sixth resistor is electrically connected to the first end of the seventh resistor; and a third node is provided between the sixth resistor and the seventh resistor for outputting a third signal; the second end of the seventh resistor is electrically connected to the first end of the eighth resistor; and a fourth node is provided between the seventh resistor and the eighth resistor for outputting a fourth signal; the second end of the eighth resistor is electrically connected to the ground terminal.

[0020] The cathode of the controllable voltage regulator module is electrically connected to the third node, the anode of the controllable voltage regulator module is electrically connected to the ground terminal, and the reference terminal of the controllable voltage regulator module is electrically connected to the fourth node.

[0021] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0022] This utility model's pressure-sensing adapter adds a pressure sensor to the power plug. When the user unplugs the power plug, the force applied to the power plug is sent to a comparator via the pressure sensor. The comparator then generates a low logic signal to the control unit. Based on the low logic signal, the control unit sends a low potential signal to the switching unit to interrupt the positive power supply voltage output. All of the above actions are completed before the power plug is unplugged, thereby avoiding sparks when plugging and unplugging the power plug, improving safety performance, and offering low cost and high reliability. Attached Figure Description

[0023] The technical solution of this utility model will be further described below with reference to the accompanying drawings:

[0024] Figure 1 This is a circuit diagram of a pressure-sensing adapter according to an embodiment of the present invention;

[0025] Figure 2 for Figure 1 A partial schematic diagram;

[0026] Figure 3 This is a circuit diagram of the voltage regulator unit in one embodiment of the present invention;

[0027] The components are as follows: 1. Switching unit; 2. Control unit; 3. Output plug; 4. First resistor; 10. First terminal of the switching unit; 11. Second terminal of the switching unit; 12. Control terminal; 20. Input terminal of the control unit (CC1 node); 30. Pressure control circuit; 31. Voltage regulating unit; 300. Comparison unit; 301. Pressure setting unit; 302. Pressure sensing unit; 30a. Comparator; 30b. Second resistor; 30b1. First terminal of the second resistor; 30a1. Output terminal of the comparator; 30a2. 1. Positive terminal of comparator; 30a2. Negative terminal of comparator; 30b2. Second terminal of second resistor; 32a. Third resistor; 32b. Fourth resistor; 32a2. First terminal of third resistor; 62. First node; 32b1. First terminal of fourth resistor; 33a. Fifth resistor; 33b. Pressure sensor; 72. Second node; 33a1. First terminal of fifth resistor; 80. Sixth resistor; 81. Seventh resistor; 82. Eighth resistor; 83. Controllable voltage regulator module; 84. Third node; 85. Fourth node; 830. Cathode of Zener diode; 831. Reference terminal; 832. Anode of Zener diode; Gnd. Ground; Vout. Output terminal. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0029] This invention provides a pressure-sensing adapter to solve the problem in the prior art where, when a user unplugs the power cord, the current still flows between the metal contacts, and the momentary disconnection may cause arcing, reducing its service life and potentially posing a safety hazard.

[0030] For ease of understanding, the specific processes in the embodiments of this application are described below. Please refer to [link / reference]. Figures 1 to 3 A pressure-sensing adapter according to an embodiment of this application includes a switch unit 1, a control unit 2, and an output plug 3.

[0031] The first terminal 10 of the switching unit 1 is used to receive the positive power supply voltage (not shown in the figure), the second terminal 11 of the switching unit 1 is used to output the positive power supply voltage, and the switching unit 1 is used to control the on and off of the positive power supply voltage.

[0032] The control unit 2 is electrically connected to the control terminal 12 of the switch unit 1 to output a high-potential or low-potential signal to the control terminal 12. The control terminal 12 is used to control the positive power supply voltage to be turned on or off.

[0033] See Figure 1 The output plug 3 includes a pressure control circuit 30 and a voltage regulator unit 31. The pressure control circuit 30 includes a comparison unit 300, a pressure setting unit 301, and a pressure sensing unit 302; the output terminal of the comparison unit 300 is electrically connected to the control unit 2. The output terminal of the pressure setting unit 301 is electrically connected to the negative terminal of the comparison unit 300 to transmit a first signal to the comparison unit 300. The output terminal of the pressure sensing unit 302 is electrically connected to the positive terminal of the comparison unit 300 to transmit a second signal to the comparison unit 300.

[0034] The voltage regulator unit 31 is electrically connected to the output terminal Vout, the second terminal 11 of the switching unit, the pressure setting unit 301 and the pressure sensing unit 302. The voltage regulator unit 31 is used to receive the positive power supply voltage and provide a fixed voltage for the pressure setting unit 301 and the pressure sensing unit 302.

[0035] The comparison unit 300 outputs a pressure signal to the control unit 2 based on the first signal and the second signal; when the pressure signal is a low logic potential, the control unit 2 outputs a low potential signal, and the switching unit 1 interrupts the output of the positive power supply voltage based on the low potential signal.

[0036] In use, when the user unplugs the output plug 3, the comparison unit 300 outputs a low logic potential to the control unit 2 based on the first and second signals. The control unit 2 then outputs a low-potential signal, and the switching unit 1 interrupts the output of the positive power supply voltage based on the low-potential signal. This allows for rapid detection and power cut-off at the initial stage of the user's plugging and unplugging action, resulting in low cost, high reliability, and no arcing at the metal contact points.

[0037] See Figure 2 A first resistor 4 is also provided between the switching unit 1 and the control unit 2; one end of the first resistor 4 is electrically connected to the control terminal 12 of the switching unit, and the other end is electrically connected to the output terminal of the control unit 2. In this embodiment, the first resistor 4 serves to limit current and protect the switching unit 1 and the control unit 2.

[0038] See Figure 2The comparison unit 300 includes a comparator 30a and a second resistor 30b. The output terminal 30a1 of the comparator is electrically connected to the first terminal 30b1 of the second resistor 30b and the input terminal 20 of the control unit. The function of the second resistor 30b is to eliminate the floating potential at the output terminal of the comparator 30a, providing a definite potential state for the signal line, so that the comparator 30a can output a stable potential. The positive terminal 30a2 and the negative terminal 30a3 of the comparator are electrically connected to the pressure sensing unit 302 and the pressure setting unit 301, respectively. The comparison unit 300 outputs a pressure signal to the input terminal 20 (CC1 node) of the control unit 2 based on the first signal and the second signal provided by the pressure sensing unit 302 and the pressure setting unit 301, respectively. Then, the control unit 2 determines whether to output a high-potential signal or a low-potential signal to the switching unit 1. The second terminal 30b2 of the second resistor is electrically connected to the pressure sensing unit 302 and the pressure setting unit 301, respectively.

[0039] The pressure setting unit 301 includes a third resistor 32a and a fourth resistor 32b. The third resistor 32a and the fourth resistor 32b are electrically connected in series, and the first terminal 32a2 of the third resistor is grounded (Gnd). A first node 62 is located between the third resistor 32a and the fourth resistor 32b to output a first signal to the negative terminal 30a3 of a comparator. The first terminal 32b1 of the fourth resistor is electrically connected to the second terminal 30b2 of the second resistor. This pressure setting unit 301 provides a first signal to the negative terminal 30a3 of the comparator, causing the comparator 30a to receive a first input voltage.

[0040] The pressure sensing unit 302 includes a fifth resistor 33a and a pressure sensor 33b. The fifth resistor 33a and the pressure sensor 33b are electrically connected in series. The end of the pressure sensor 33b is grounded (Gnd). A second node 72 is located between the fifth resistor 33a and the pressure sensor 33b to output a second signal to the positive terminal 30a2 of the comparator. The first terminal 33a1 of the fifth resistor is electrically connected to the second terminal 30b2 of the second resistor. This pressure sensing unit 302 provides a second signal to the positive terminal 30a2 of the comparator, enabling the comparator 30a to obtain a second input voltage. After the first input voltage from the first signal and the second input voltage from the second signal are input to the comparator 30a, the comparator 30a outputs a low logic potential or a high logic potential to the control unit 2 based on the comparison result of the first input voltage and the second input voltage. When the control unit 2 receives a high logic potential and outputs a high potential, the switch unit 1 is turned on; when the control unit 2 receives a low logic potential and outputs a low potential, the switch unit 1 is turned off.

[0041] In this embodiment, when the pressure sensor 33b is subjected to an external force, the impedance of the pressure sensor 33b decreases. After being divided by the fifth resistor 33a, the second signal is input to the positive terminal 30a2 of the comparator, causing the voltage at the positive terminal 30a2 of the comparator to decrease. Thus, the voltage at the positive terminal 30a2 of the comparator is less than the voltage at the negative terminal 30a3 of the comparator. The comparator 30a outputs a low logic potential to the control unit 2. The control unit 2 sends a low potential signal to the switching unit 1 based on the low logic potential. The switching unit 1 interrupts the output of the positive power supply voltage based on the low potential signal, so there is no voltage output.

[0042] Furthermore, in this embodiment, the pressure sensor 33b is covered by the power plug 3, and the actual usage process is as follows:

[0043] When the user unplugs the power plug 3, the pressure sensor 33b receives external force. At this time, the impedance of the pressure sensor 33b decreases. The pressure sensor 33b sends a second signal to the positive terminal 30a2 of the comparator after voltage division with the fifth resistor 33a. The voltage at the positive terminal 30a2 of the comparator is less than the voltage at the negative terminal 30a3 of the comparator. The comparator 30a outputs a low logic potential to the input terminal 20 (CC1 node) of the control unit. After receiving the low logic potential, the control unit 2 sends a low potential signal to the control terminal 12 of the switching unit 1, causing the switching unit 1 to open. In this way, the first terminal 10 and the output terminal Vout of the switching unit are in a cut-off state, and there is no voltage output.

[0044] When the adapter is in use, the power plug 3 remains plugged into the load system. The pressure sensor 33b is not in contact with any external force, so the impedance of the pressure sensor 33b remains high. The pressure sensor 33b sends a second signal to the positive terminal 30a2 of the comparator after voltage division with the fifth resistor 33a. The voltage at the positive terminal 30a2 of the comparator is greater than the voltage at the negative terminal 30a3 of the comparator. The comparator 30a outputs a high logic potential to the input terminal 20 (CC1 node) of the control unit. After receiving the high logic potential, the control unit 2 sends a high potential signal to the control terminal 12 of the switching unit 1, so that the switching unit 1 is turned on. In this way, the first terminal 10 and the output terminal Vout of the switching unit are in a conducting state, and there is a voltage output.

[0045] In summary, by installing a pressure sensor 33b encased in the power plug 3, sparks are avoided when plugging or unplugging the power plug 3, resulting in a high safety factor.

[0046] See Figure 3The voltage regulator unit 31 includes a sixth resistor 80, a seventh resistor 81, an eighth resistor 82, and a controllable voltage regulator module 83. The controllable voltage regulator module 83 internally contains an OP comparator (for voltage comparison) and an adjustment unit (such as a transistor / switch for current regulation). The first terminal of the sixth resistor 80 is connected to the output terminal Vout, and the second terminal of the sixth resistor 80 is connected to the first terminal of the seventh resistor 81. A third node 84 is located between the sixth resistor 80 and the seventh resistor 81. The second terminal of the seventh resistor 81 is connected to the first terminal of the eighth resistor 82, and a fourth node 85 is located between the seventh resistor 81 and the eighth resistor 82 for outputting a fourth signal. The second terminal of the eighth resistor 82 is electrically connected to ground Gnd.

[0047] The cathode 830 of the controllable voltage regulator module is electrically connected to the third node 84 to output a third signal. The anode 832 of the controllable voltage regulator module is electrically connected to ground Gnd. The reference terminal 831 of the controllable voltage regulator module is electrically connected to the fourth node 85 to receive a fourth signal.

[0048] During operation, when the controllable voltage regulator module 83 detects an increase in the voltage at the output terminal Vout through the reference terminal 831, the fourth signal (detected voltage) received by the fourth node 85 exceeds the reference voltage inside the controllable voltage regulator module 83. This triggers the controllable voltage regulator module 83 to reduce the equivalent resistance of the internal switch according to the detected voltage, thereby allowing more current to be discharged through the internal switch, thus stabilizing the voltage of the third node 84 at a specific voltage.

[0049] When the controllable voltage regulator module 83 detects a decrease in the voltage at the output terminal Vout through the reference terminal 831, the fourth signal (detected voltage) received by the fourth node 85 is lower than the reference voltage inside the controllable voltage regulator module 83. This triggers the controllable voltage regulator module 83 to increase the equivalent resistance of the internal switch according to the detected voltage, thereby increasing the voltage allocated to the internal switch and stabilizing the voltage of the third node 84 at a specific voltage.

[0050] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A pressure-sensing adapter, characterized in that, include: A switching unit, wherein a first terminal of the switching unit is used to receive a positive power supply voltage, a second terminal of the switching unit is used to output the positive power supply voltage, and the switching unit is used to control the on / off state of the positive power supply voltage; A control unit is electrically connected to a control terminal of the switching unit to output a high-potential or low-potential signal to the control terminal; One output plug, including A pressure control circuit, including: A comparison unit, one output of which is electrically connected to the control unit; A pressure setting unit, wherein an output terminal of the pressure setting unit is electrically connected to the negative terminal of the comparison unit, for transmitting a first signal to the comparison unit; A pressure sensing unit, one of whose output terminals is electrically connected to the positive terminal of the comparison unit, for transmitting a second signal to the comparison unit; A voltage regulator unit is electrically connected to an output terminal, the second terminal of the switching unit, the pressure setting unit, and the pressure sensing unit. The voltage regulator unit is used to receive the positive power supply voltage and provide a fixed voltage to the pressure setting unit and the pressure sensing unit. The comparison unit outputs a pressure signal to the control unit based on the first signal and the second signal; when the pressure signal is a low logic level, the control unit outputs the low-level signal, and the switching unit interrupts the output of the positive power supply voltage based on the low-level signal.

2. The pressure-sensing adapter as described in claim 1, characterized in that: A first resistor is also provided between the switching unit and the control unit; one end of the first resistor is electrically connected to the control terminal of the switching unit, and the other end of the first resistor is electrically connected to the output terminal of the control unit.

3. The pressure-sensing adapter as described in claim 1, characterized in that: The comparison unit includes a comparator and a second resistor; the output terminal of the comparator is electrically connected to the first terminal of the second resistor and the input terminal of the control unit; the second terminal of the second resistor is electrically connected to the pressure setting unit and the pressure sensing unit respectively; the positive terminal and the negative terminal of the comparator are electrically connected to the pressure sensing unit and the pressure setting unit respectively; the comparator is used to output a pressure signal to the input terminal of the control unit based on the first signal and the second signal; the second resistor is used to stabilize the pressure signal.

4. The pressure-sensing adapter as described in claim 3, characterized in that: The pressure setting unit includes a third resistor and a fourth resistor; the third resistor and the fourth resistor are electrically connected in series, and there is a first node between the third resistor and the fourth resistor to output the first signal to the negative terminal of the comparator; the first terminal of the fourth resistor is electrically connected to the second terminal of the second resistor.

5. The pressure-sensing adapter as described in claim 3, characterized in that: The pressure sensing unit includes a fifth resistor and a pressure sensor; the fifth resistor and the pressure sensor are electrically connected in series, and a second node is provided between the fifth resistor and the pressure sensor to output the second signal to the positive terminal of the comparator; the first terminal of the fifth resistor is electrically connected to the second terminal of the second resistor.

6. The pressure-sensing adapter as described in claim 1, characterized in that: The voltage regulator unit includes a sixth resistor, a seventh resistor, an eighth resistor, and a controllable voltage regulator module; The first end of the sixth resistor is electrically connected to the output terminal and the second end of the switching unit; the second end of the sixth resistor is electrically connected to the first end of the seventh resistor; and a third node is provided between the sixth resistor and the seventh resistor for outputting a third signal; the second end of the seventh resistor is electrically connected to the first end of the eighth resistor; and a fourth node is provided between the seventh resistor and the eighth resistor for outputting a fourth signal; the second end of the eighth resistor is electrically connected to the ground terminal. The cathode of the controllable voltage regulator module is electrically connected to the third node, the anode of the controllable voltage regulator module is electrically connected to the ground terminal, and the reference terminal of the controllable voltage regulator module is electrically connected to the fourth node.

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