Improved power adapter detection system

Abstract

This invention provides an improved power adapter detection system, comprising a power adapter detection unit coupled to a light-emitting unit. When detecting a power adapter, the power adapter detection unit and the power adapter are located within a containment space with a temperature exceeding 40°C. The output terminal of the power adapter is coupled to the light-emitting unit. This invention achieves an improved power adapter detection system that can easily check whether the resistor is functioning, even when the power adapter is under high-temperature protection.

Description

[Technical Field]

[0001] This invention relates to the field of hardware devices, and in particular to a recoverable voltage protection circuit with remote global self-reset and its operating method. [Background Technology]

[0002] In Mean Time Between Failures (MTBF) testing, used for AC / automotive power adapter life testing, the minimum number of tests is typically 30 pieces, requiring at least 30 unit-channel load cells to handle the load. However, 30 unit-channel load cells are generally not prepared, so power-dissipating resistors are used as the power carrier.

[0003] However, the resistor acting as a load consumes power and generates heat, so it gets very hot, often exceeding 100°C. To confirm its operation, it's necessary to briefly touch it to feel its heat. This is how you know it's working. However, when operating within a 60°C chamber, the adapter may experience temporary over-temperature protection, which cannot be detected during inspection. If an adapter is in over-temperature protection mode, it cannot be reset in time to ensure normal operation.

[0004] Because of these shortcomings, it is necessary to be able to display in real time the working status of the adapter at room temperature, or at 60 degrees Celsius, or at 40 degrees Celsius in the cavity, and whether the output has been stopped for protection. [Summary of the Invention]

[0005] The purpose of this invention is to at least overcome one of the shortcomings of the prior art. Specifically, this invention achieves the following objectives: a. When checking whether the power adapters in the containment space are working, it is no longer necessary to manually touch and feel the resistors one by one. b. During inspection, if a power adapter is under high-temperature protection, it can be reset in time to allow it to work normally (or a multimeter can be used at appropriate frequencies to measure whether there is output voltage). c. It is possible to observe whether multiple power adapters within the containment space are working normally without entering the space.

[0006] Therefore, the purpose of this invention is to provide an improved power adapter detection system that can address the aforementioned deficiencies of the prior art.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The present invention provides an improved power adapter detection system, including a power adapter detection unit coupled to a light-emitting unit. When detecting a power adapter, the power adapter detection unit and the power adapter are located in an accommodating space. The temperature in the accommodating space is higher than 40°C, and the output terminal of the power adapter is coupled to the light-emitting unit.

[0008] Furthermore, the light-emitting unit is a flashing light-emitting circuit.

[0009] Furthermore, the light-emitting unit includes a first transistor, a second transistor, a first light-emitting diode, a second light-emitting diode, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a third capacitor, and a fourth capacitor; the fourth resistor is coupled between the output terminal of the power adapter and the first light-emitting diode, the first light-emitting diode is coupled between the fourth resistor and the collector of the first transistor, the seventh resistor is coupled between the output terminal of the power adapter and the second light-emitting diode, and the second light-emitting diode is coupled between the seventh resistor and the collector of the second transistor; the third capacitor is coupled between the base of the second transistor and a first contact. The first LED is located between the collector of the first transistor and the collector of the second transistor. The fourth capacitor is coupled to the base of the first transistor and a second contact, and is located between the collector of the second LED and the collector of the second transistor. The fifth resistor is coupled to a third contact and a fourth contact. The third contact is located between the output terminal of the power adapter and the seventh resistor, and the fourth contact is located between the base of the first transistor and the fourth capacitor. The sixth resistor is coupled to a fifth contact and a sixth contact. The fifth contact is located between the third contact and the seventh resistor, and the sixth contact is located between the base of the second transistor and the third capacitor. The emitters of the first transistor and the second transistor are grounded.

[0010] Furthermore, a third resistor is coupled between the output terminal of the power adapter and the light-emitting unit.

[0011] Furthermore, the temperature within the containment space exceeds 60°C.

[0012] Furthermore, the power adapter detection unit includes a first capacitor, a second capacitor, a first resistor, and a second resistor. One end of the first capacitor is coupled to a contact between a system input terminal and the input terminal of the power adapter. One end of the second capacitor is coupled to a seventh contact between the output terminal of the power adapter and the light-emitting unit. One end of the second resistor is coupled to a Vadj pin of the power adapter. One end of the first resistor is coupled to an eighth contact located between the output terminal of the power adapter and the seventh contact. The other end of the first resistor is coupled to a ninth contact located between the Vadj pin and the second resistor. The other ends of the first capacitor, the second capacitor, and the second resistor are grounded.

[0013] Furthermore, the light-emitting unit is located within the accommodating space.

[0014] The technical solution of this invention avoids the following situation by setting a light-emitting unit coupled to the power adapter detection unit: For example, when testing an AC / vehicle power adapter (output 19.5Vdc 230watts), the required resistor is 1.66kohm. The resistor consumes power and generates heat, causing it to become very hot, often exceeding 100°C. To confirm whether it is working, a brief touch is required. However, when operating in a 60°C chamber, the power adapter may experience a brief over-temperature protection event, making it impossible to determine whether it is still working. Therefore, an indicator light that can display its working / protection / damage status in real time is needed.

[0015] The specific techniques employed in this invention will be further explained through the following embodiments and accompanying drawings. [Attached Image Description]

[0016] Figure 1 This is a block diagram of an improved power adapter detection system according to the present invention.

[0017] Figure 2 This is a circuit diagram of an improved power adapter detection system according to the present invention.

[0018] Explanation of key component symbols:

[0019] 1. Improved power adapter detection system

[0020] 10 Power Adapter Detection Unit

[0021] 11 Light-emitting units

[0022] 12 Storage space

[0023] C1 First capacitor

[0024] C2 Second capacitor

[0025] C3 Third capacitor

[0026] C4 Fourth capacitor

[0027] Q1 First transistor

[0028] Q2 Second transistor

[0029] R1 is the first resistor.

[0030] R2, the second resistor

[0031] R3 Third resistor

[0032] R4 Fourth Resistor

[0033] R5, the fifth resistor

[0034] R6, the sixth resistor

[0035] R7 Seventh Resistor

[0036] p1 First contact point

[0037] p2 Second contact point

[0038] p3 Third junction

[0039] p4 Fourth junction

[0040] p5 Fifth Node

[0041] p6 Sixth junction

[0042] p7 Seventh Node

[0043] p8 Eighth junction

[0044] p9 Ninth junction

[0045] b base

[0046] c Collector

[0047] e Emitter

[0048] INPUT system input terminal

[0049] Vout output terminal

[0050] Vin input terminal

[0051] Vadj Vadj pin

Detailed Implementation Methods

[0052] To fully understand the purpose, features and effects of the present invention, the present invention will be described in detail below with reference to the following specific embodiments and accompanying drawings.

[0053] Please refer to Figure 1 This is a block diagram of an improved power adapter detection system 1 according to the present invention. The improved power adapter detection system 1 includes a power adapter detection unit 10, a light-emitting unit 11, and a housing space 12. The power adapter detection unit 10 of the improved power adapter detection system 1 is coupled to the light-emitting unit 11. When detecting a power adapter 2, the power adapter detection unit 10 and the power adapter 2 are located in the housing space 12. The temperature in the housing space 12 is higher than 40°C, and the output terminal Vout of the power adapter 2 is coupled to the light-emitting unit 11.

[0054] Furthermore, the light-emitting unit is a flashing light-emitting circuit, and the accommodating space 12 enclosed by a housing is a chamber.

[0055] like Figure 2As shown in the circuit diagram of the improved power adapter detection system 1 described above, the light-emitting unit 11 includes a first transistor Q1, a second transistor Q2, a first light-emitting diode Led1, a second light-emitting diode Led2, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a third capacitor C3, and a fourth capacitor C4. The fourth resistor R4 is coupled between the output terminal Vout of the power adapter 2 and the first light-emitting diode Led1. The first light-emitting diode Led1 is coupled between the fourth resistor R4 and the collector c of the first transistor Q1. The seventh resistor R7 is coupled between the output terminal Vout of the power adapter 2 and the second light-emitting diode Led2. The second light-emitting diode Led2 is coupled between the seventh resistor R7 and the collector c of the second transistor Q2. The third capacitor C3 is coupled to the second transistor Q2. A base b of the first transistor Q1 is connected to a first contact p1, which is located between the first light-emitting diode Led1 and the collector c of the first transistor Q1. A fourth capacitor C4 is coupled to a base b of the first transistor Q1 and a second contact p2, which is located between the second light-emitting diode Led2 and the collector c of the second transistor Q2. A fifth resistor R5 is coupled to a third contact p3 and a fourth contact p4. The third contact p3 is located between the output terminal Vout of the power adapter 2 and the seventh resistor R7. The fourth contact p4 is located between the base b of the first transistor Q1 and the fourth capacitor C4. A sixth resistor R6 is coupled to a fifth contact p5 and a sixth contact p6. The fifth contact p5 is located between the third contact p3 and the seventh resistor R7. The sixth contact p6 is located between the base b of the second transistor Q2 and the third capacitor C3. An emitter e of the first transistor Q1 and an emitter e of the second transistor Q2 are grounded.

[0056] In one embodiment, a third resistor R3 is coupled between the output terminal Vout of the power adapter 2 and the light-emitting unit 11. In another embodiment, the light-emitting unit 11 is located within the accommodating space 12.

[0057] Generally speaking, the temperature inside the accommodating space 2 can be higher than 60°C.

[0058] In a typical embodiment of the power adapter detection unit 10, it includes a first capacitor C1, a second capacitor C2, a first resistor R1, and a second resistor R2. One end of the first capacitor C1 is coupled to a contact between a system input terminal INPUT and the input terminal Vin of the power adapter 2. One end of the second capacitor C2 is coupled to a seventh contact p7 between the output terminal Vout of the power adapter 2 and the light-emitting unit 11. One end of the second resistor R2 is coupled to a Vadj pin of the power adapter 2. One end of the first resistor R1 is coupled to an eighth contact p8, which is located between the output terminal Vout of the power adapter 2 and the seventh contact p7. The other end of the first resistor R1 is coupled to a ninth contact p9, which is located between the Vadj pin and the second resistor R2. The other ends of the first capacitor C1, the second capacitor C2, and the second resistor R2 are grounded.

[0059] In one example of this invention, the capacitance values ​​of the first capacitor C1 and the second capacitor C2 are both 0.1 microfarads, and the capacitance values ​​of the third capacitor C3 and the fourth capacitor C4 are both 100 microfarads; the resistance value of the first resistor R1 is 1k ohm, the resistance value of the second resistor R2 is 2k ohms, the resistance value of the third resistor R3 is 200 ohms, the resistance value of the fourth resistor R4 and the seventh resistor R7 is 470 ohms, and the resistance value of the fifth resistor R5 and the sixth resistor R6 is 10k ohms; the operating voltage range of the first light-emitting diode Led1 and the second light-emitting diode Led2 is 1VDC-5VDC, and the current is 10-100mA. If the voltage of the power adapter 2 is tested, it is approximately 19V. At this time, since the current value of ADJ at the Vadj pin is very small, it can generally be ignored, and the output voltage V at the output terminal Vout is usually determined by adjusting the resistance value of the second resistor R2 (adjusting the voltage at the third resistor R3 to 9V+ / -1V is sufficient).

[0060] V / (R3)=(1+R2 / R1)*1.25V+I adj*R2

[0061] I = V / R3 = 18mA

[0062] That is, V = 3.75 (V) is calculated. At this time, the current of the first LED (Led1) and the second LED (Led2) is I = 3.75 / 200 = 18mA. Therefore, the DC-adjustable blinking circuit of the present invention, together with the adjustable resistors R1, R2, and R3, constitutes a DC step-down alternating blinking circuit. This allows the ordinary first LED (Led1) and second LED (Led2) to blink alternately to indicate that the power adapter 2 is working normally.

[0063] It is worth noting that the connection between the aforementioned units, components, devices, modules, and / or equipment can be direct or indirect. An indirect connection means that other units, components, devices, modules, and / or equipment can be installed between them without departing from the scope of this invention.

[0064] This invention achieves the following effects through the above circuit design: a. When checking whether the power adapters in the storage space are working, it is no longer necessary to manually touch and feel whether the resistors are working. b. During inspection, if a power adapter is under high-temperature protection, it can be reset in time to make it work normally (or a multimeter can be used at an appropriate frequency to measure whether there is output voltage). c. It is possible to observe whether multiple power adapters inside are working normally without entering the storage space.

[0065] While the embodiments of the present invention are disclosed as described above, they are not intended to limit the present invention. Any person skilled in the art may make some changes to the shape, structure, features, methods and quantities described in the claims of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of patent protection of the present invention shall be determined by the scope of the claims appended to this specification.

Claims

1. An improved power adapter detection system, characterized in that, The improved power adapter detection system includes: a power adapter detection unit coupled to a light-emitting unit; when detecting a power adapter, the power adapter detection unit and the power adapter are located in an accommodating space, the temperature in the accommodating space is higher than 40°C, and the output terminal of the power adapter is coupled to the light-emitting unit. The light-emitting unit includes a first transistor, a second transistor, a first light-emitting diode, a second light-emitting diode, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a third capacitor, and a fourth capacitor. The fourth resistor is coupled between the output terminal of the power adapter and the first LED. The first LED is coupled between the fourth resistor and the collector of the first transistor. The seventh resistor is coupled between the output terminal of the power adapter and the second LED. The second LED is coupled between the seventh resistor and the collector of the second transistor. The third capacitor is coupled between the base of the second transistor and a first contact, and is located between the first LED and the collector of the first transistor. The fourth capacitor is coupled between the base of the first transistor and a second contact. A point is located between the collector of the second light-emitting diode and the collector of the second transistor; the fifth resistor is coupled to a third contact and a fourth contact, the third contact being located between the output terminal of the power adapter and the seventh resistor, and the fourth contact being located between the base of the first transistor and the fourth capacitor; the sixth resistor is coupled to a fifth contact and a sixth contact, the fifth contact being located between the third contact and the seventh resistor, and the sixth contact being located between the base of the second transistor and the third capacitor; an emitter of the first transistor and an emitter of the second transistor are grounded; The power adapter detection unit includes a first capacitor, a second capacitor, a first resistor, and a second resistor. One end of the first capacitor is coupled to a contact between a system input terminal and the input terminal of the power adapter. One end of the second capacitor is coupled to a seventh contact between the output terminal of the power adapter and the light-emitting unit. One end of the second resistor is coupled to a Vadj pin of the power adapter. One end of the first resistor is coupled to an eighth contact located between the output terminal of the power adapter and the seventh contact. The other end of the first resistor is coupled to a ninth contact located between the Vadj pin and the second resistor. The other ends of the first capacitor, the second capacitor, and the second resistor are grounded.

2. The improved power adapter detection system according to claim 1, characterized in that, The light-emitting unit is a flashing light-emitting circuit.

3. The improved power adapter detection system according to claim 1, characterized in that, A third resistor is coupled between the output terminal of the power adapter and the light-emitting unit.

4. The improved power adapter detection system according to claim 1, characterized in that, The temperature within the accommodating space is above 60°C.

5. The improved power adapter detection system according to claim 1, characterized in that, The light-emitting unit is located within the accommodating space.

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