TWM644193U - Discharge protection device - Google Patents

Abstract

A discharge protection device includes a load, an electronic security chip, and a discharge circuit. The electronic security chip is configured to detect an input voltage of an external power supply. If the input voltage is lower than a first preset voltage, the electronic security chip is configured to generate a control signal. The discharge circuit is coupled to the electronic security chip and the load, and is configured to receive the control signal so as to guide the input voltage of the external power supply to a ground side according to the control signal.

Description

discharge protection device

This case involves an electronic device. Specifically, this case involves a discharge protection device.

After the main board of an existing computer or notebook is removed from the DC power supply, the residual energy of the capacitor on the main board causes the voltage to drop too slowly, and there is no other path for the power input of the main board to discharge the voltage, and the power input to the If the residual charge between the main boards cannot be quickly discharged, it may cause damage to the computer or laptop when it is turned on and cause errors in the peripheral devices connected to the computer or laptop.

Therefore, the above-mentioned technology still has many defects, and practitioners in the field need to develop other suitable and fast-discharging discharge protection devices.

One aspect of this case relates to a discharge protection device. The discharge protection device includes a load, an electronic insurance chip and a discharge circuit. The electronic fuse chip is used to detect the input voltage of the external power supply. If the input voltage is lower than the first preset voltage, the electronic insurance chip is used to generate a control signal. The discharge circuit is coupled to the electronic fuse chip and the load, and is used to receive the control signal, so as to guide the input voltage of the external power supply to the ground terminal according to the control signal.

In view of the shortcomings and deficiencies of the aforementioned prior art, this case provides a discharge protection device, through the design of the internal circuit of the discharge protection device, to monitor or detect the voltage and current input by the external power supply, so as to maintain the load (for example: motherboard) Stable, and when the external power supply is restored, the load of the discharge protection device (such as: the motherboard) can operate normally.

The following will clearly illustrate the spirit of this case with drawings and detailed descriptions. Anyone with common knowledge in the technical field can change and modify the technology taught in this case after understanding the embodiment of this case. It does not depart from the spirit of this case. Spirit and scope.

The terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting of the present case. Singular forms such as "a", "the", "the", "this" and "the", as used herein, also include plural forms.

"Includes", "including", "has", "containing" and so on used in this article are all open terms, meaning including but not limited to.

Regarding the terms (terms) used in this article, unless otherwise specified, generally have the ordinary meaning of each term used in this field, in the content of this case and in the special content. Certain terms used to describe the subject matter are discussed below or elsewhere in this specification to provide those skilled in the art with additional guidance in describing the subject matter.

FIG. 1 is a schematic circuit block diagram of a discharge protection device 100 according to some embodiments of the present application. In some embodiments, please refer to FIG. 1 , the discharge protection device 100 includes a load 110 , a discharge circuit 120 and an electronic insurance chip 130 . In some embodiments, the discharge protection device 100 is a computer or a laptop. In some embodiments, the load 110 is a motherboard inside a computer or a motherboard inside a notebook. The discharge circuit 120 is coupled to the load 110 and the electronic insurance chip 130 . The electronic security chip 130 is coupled to an external power source 900 .

In some embodiments, the electronic fuse chip 130 is used to detect the input voltage of the external power supply 900 (not shown in the figure). If the input voltage (not shown in the figure) is lower than the first preset voltage, the electronic insurance chip 130 is used to generate a control signal (not shown in the figure). The discharge circuit 120 is used for receiving a control signal (not shown in the figure), so as to lead the input voltage (not shown in the figure) of the external power supply 900 to the ground terminal according to the control signal (not shown in the figure).

In some embodiments, the ground terminal includes a casing of a computer or a casing of a laptop.

FIG. 2 is a schematic diagram of the discharge circuit 120 and the electronic insurance chip 130 of the discharge protection device 100 shown in FIG. 1 according to some embodiments of the present application. In some embodiments, the discharge circuit 120 includes a first node N1, a second node N2, a first transistor T1, a second transistor T2, a first voltage divider 121, a second voltage divider 122 and a current limiting circuit 123.

In some embodiments, please refer to FIG. 2 , and count from the top and right of the components in the figure as the first end. The first transistor T1 includes a first terminal, a second terminal and a control terminal (ie, the gate terminal G of the first transistor T1 ). The first end of the first transistor T1 is coupled to the second node N2. The second end of the first transistor T1 is coupled to the ground end. The control terminal of the first transistor T1 is coupled to the first node N1, and is used for conducting in response to the first level of the control signal CS of the first node N1.

In some embodiments, the second transistor T2 includes a first terminal, a second terminal and a control terminal (ie, the gate terminal G of the second transistor T2 ). The first end of the second transistor T2 is coupled to the load 110 and the electronic fuse chip 130 . The second end of the second transistor T2 is coupled to the ground end. The control terminal of the second transistor T2 is coupled to the second node N2, and is used for conducting in response to the second level of the second node N2.

In some embodiments, the first voltage dividing circuit 121 is coupled to the first node N1 and the control terminal of the first transistor T1. The first voltage dividing circuit 121 is used for receiving the input voltage Vin, and adjusting the input voltage Vin according to the first level of the control signal CS, so as to turn on or off the first transistor T1.

In some embodiments, please refer to FIG. 2 , the first voltage dividing circuit 121 includes a resistor R1 and a resistor R2 . The resistor R1 includes a first terminal and a second terminal. The first end of the resistor R1 is used to receive the input voltage Vin. The second end of the resistor R1 is coupled to the first node N1. The resistor R2 includes a first terminal and a second terminal. A first end of the resistor R2 is coupled to the first node N1. The second terminal of the resistor R2 is coupled to the ground terminal. The resistance values of the resistors R1 and R2 can be designed according to actual needs, and are not limited to this embodiment. The resistor R1 and the resistor R2 are connected in series.

In some embodiments, the second voltage divider circuit 122 is coupled to the second node N2, the first terminal of the first transistor T1 and the control terminal of the second transistor T2, and is used for receiving the input voltage Vin, and according to The second level of the second node N2 is used to adjust the input voltage Vin.

In some embodiments, the second voltage dividing circuit 122 includes a resistor R3 and a resistor R4. The resistor R3 includes a first terminal and a second terminal. The first end of the resistor R3 is used to receive the input voltage Vin. The second end of the resistor R1 is coupled to the second node N2. The resistor R4 includes a first terminal and a second terminal. A first end of the resistor R4 is coupled to the second node N2. The second terminal of the resistor R2 is coupled to the ground terminal. The resistance values of the resistors R3 and R4 can be designed according to actual needs, and are not limited to this embodiment. The resistor R3 and the resistor R4 are connected in series.

In some embodiments, the current limiting circuit 123 is coupled to the load 110 , the electronic insurance chip 130 and the first terminal of the second transistor T2 , and is used for detecting the output voltage Vout. If the output voltage Vout forms a current between the load 110 and the electronic fuse chip 130 that exceeds a preset current, the current limiting circuit 123 is used to disconnect to form an open circuit.

In some embodiments, please refer to FIG. 2 , the current limiting circuit 123 includes a resistor R5 and a resistor R6 . The resistor R5 includes a first terminal and a second terminal. The resistor R6 includes a first terminal and a second terminal. Both the first end of the resistor R5 and the first end of the resistor R6 are coupled to the load 110 and the electronic fuse chip 130 . Both the second terminal of the resistor R5 and the second terminal of the resistor R6 are coupled to the first terminal of the second transistor T2.

In some embodiments, the electronic insurance chip 130 includes a voltage input pin IN, a voltage output pin OUT and a signal output pin PD. The voltage input pin IN is coupled to the external power source 900 for receiving the input voltage Vin. The voltage output pin OUT is coupled to the load 110 and used for generating an output voltage Vout to the load 110 according to the input voltage Vin. The signal output pin PD is coupled to the discharge circuit 120 and used for generating the control signal CS according to the input voltage Vin. In some embodiments, the electronic fuse chip 130 includes an electronic fuse (electronic fuse, e-fuse). In some embodiments, the electronic security chip 130 includes a plurality of pins (not shown in the figure), and the number of pins is not limited to the illustrated embodiment.

In some embodiments, if the input voltage Vin is higher than the second preset voltage, the electronic fuse chip 130 is turned off to form an open circuit between the external power supply 900 and the load 110 .

In order to make the operation of the discharge circuit 120 and the electronic insurance chip 130 of the discharge protection device 100 easy to understand, please refer to FIGS. 3 to 4 together. FIG. 3 is a timing diagram of the input voltage Vin and the control signal CS of the discharge protection device 100 shown in FIG. 2 according to some embodiments of the present invention. FIG. 4 is a schematic diagram of the circuit state of the discharge circuit 120 of the discharge protection device 100 shown in FIG. 2 according to some embodiments of the present application. FIG. 5 is a schematic diagram of the circuit state of the discharge circuit 120 of the discharge protection device 100 shown in FIG. 2 according to some embodiments of the present application. In some embodiments, the unit of the vertical axis in FIG. 3 is volts (V), and the unit of the horizontal axis is milliseconds (ms).

In some embodiments, please refer to FIG. 3 and FIG. 4 , in the first phase I1 , the external power supply 900 continuously provides the input voltage Vin, and the discharge protection device 100 is used to receive the input voltage Vin. If the input voltage Vin is not lower than the first preset voltage, the electronic insurance chip 130 is used to adjust the control signal CS to the first level, and transmit the control signal CS to the first node of N1, so that the first transistor T1 is turned on, so that the second transistor T2 is turned off.

For example, the input voltage Vin is 24V. If the input voltage Vin is lower than the first preset voltage (for example: 19V), the electronic insurance chip 130 is used to adjust the voltage level of the control signal CS to the first level (for example: close to -12V) to exceed the first The threshold voltage (for example: 0.7V) between the second terminal of the transistor T1 (ie, the source terminal S) and the control terminal (ie, the gate terminal G). At this time, the first transistor T1 is turned on, so that the input voltage Vin received by the first voltage divider circuit 121 and the second voltage divider circuit 122 is guided to the ground terminal connected to the second end of the first transistor T1, and then Grounding the second node N2 causes the second transistor T2 to be turned off.

In some embodiments, please refer to FIG. 3 and FIG. 5 , at time point P1 , the external power supply 900 stops providing the input voltage Vin, and the discharge protection device 100 is used to detect the voltage change of the input voltage Vin. If the input voltage Vin is lower than the first preset voltage (for example: 19V), the electronic insurance chip 130 is used to adjust the control signal CS to the third level, and transmit the control signal CS to the first node N1, so that the first The transistor T1 is turned off, and then the second transistor T2 is turned on, so as to guide the input voltage Vin of the external power supply 900 to the ground terminal through the current limiting circuit 123 and the second transistor T2 .

For example, at time point P1, when the input voltage Vin drops from 24V to 19V, the electronic insurance chip 130 is used to adjust the control signal CS to the third level (for example: close to 0V), and transmit the control signal CS to the first node N1, so that the control terminal of the first transistor T1 is turned off in response to the voltage level of the first node N1. At this time, the second voltage dividing circuit 122 divides the received input voltage Vin (for example: 24V). Assuming that the resistance values of the resistor R3 and the resistor R4 are the same, the second node N2 is 12V, and the control terminal of the second transistor T2 is turned on in response to the second level (for example: 12V) of the second node N2, so that the The input voltage Vin of the external power supply 900 is guided to the ground terminal through the current limiting circuit 123 and the second transistor T2, so that the voltage between the external power supply 900 and the load 110 is quickly discharged to the ground (ie 0V).

In some embodiments, please refer to FIG. 3 to FIG. 4 , in the second phase I2 , the discharge protection device 100 no longer receives the input voltage Vin.

It should be noted that, at this time, the discharge circuit 120 is also used to guide the remaining charge of the capacitor (not shown) on the load 110 to the ground terminal connected to the second terminal of the second transistor T2. It is further explained that since the resistors R5 and R6 of the current limiting circuit 123 and the equivalent resistance of the second transistor T2 are much lower than the load 110 , the 19V can be discharged to 0V within 1 ms.

FIG. 6 is a timing diagram of the input voltage Vin and the control signal CS of the discharge protection device 100 shown in FIG. 2 according to some embodiments of the present invention. In some embodiments, the unit of the vertical axis in FIG. 3 is volts (V), and the unit of the horizontal axis is milliseconds (ms). In some embodiments, please refer to FIG. 2 and FIG. 6 , the discharge protection device 100 continuously receives the input voltage Vin in the first phase I1 to maintain normal operation.

Then, in the second stage I2, the external power supply 900 is powered off, and the discharge protection device 100 responds to changes in the input voltage Vin, and converts the voltage between the external power supply 900 and the load 110 and the remaining charge of the capacitor (not shown in the figure) on the load 110 Quickly discharge to the terminal.

Moreover, in the third stage I3, the external power supply 900 is powered on again, and the discharge protection device 100 responds to the change of the input voltage Vin to start up and resume operation according to the input voltage Vin.

It should be noted that the above voltage levels are the variation from the lowest level to the highest level of the signal. It should be further explained that the values of the above-mentioned first preset voltage, second preset voltage and preset current can be designed according to actual needs, and are not limited to this embodiment.

According to the foregoing embodiments, this case provides a discharge protection device, which monitors or detects the voltage and current input by the external power supply through the electronic insurance chip of the discharge protection device, so as to keep the load (for example: motherboard) stable, and by The discharge circuit of the discharge protection device is used to quickly discharge the voltage between the external power supply and the load and the residual charge of the capacitor on the load. In addition, when the external power supply is restored, the load of the discharge protection device (for example: main board) can operate normally. According to the above-mentioned embodiments, the discharge protection device of this case can realize the discharge from high voltage (for example: 19V) to 0V within 1 ms when the external power supply and load (for example: motherboard) are powered off. It can be seen from this that the speed of the discharge technology in this case is super fast and far exceeds the existing norms and standards.

Although this case discloses the above with detailed embodiments, this case does not exclude other feasible implementation forms. Therefore, the scope of protection of this case should be defined by the scope of the appended patent application, rather than being limited by the foregoing embodiments.

For those skilled in the art, without departing from the spirit and scope of this document, various changes and modifications can be made to this document. Based on the foregoing embodiments, all changes and modifications made to this case are also covered within the scope of protection of this case.

100: discharge protection device 110: load 120: discharge circuit 121: The first voltage divider circuit 122: The second voltage divider circuit 123: Current limiting circuit 130: electronic insurance chip R1~R6: resistance T1~T2: Transistor IN: voltage input pin OUT: voltage output pin PD: signal output pin 900: external power supply Vin: input voltage Vout: output voltage CS: control signal G: gate terminal D: drain terminal S: source terminal I1~I3: stage P1: time point

The content of this case can be better understood with reference to the implementation manner in the following paragraphs and the following drawings: Figure 1 is a schematic circuit block diagram of a discharge protection device according to some embodiments of the present case; Figure 2 is a schematic diagram of the discharge circuit and electronic insurance chip of the discharge protection device according to some embodiments of the present case; Figure 3 is a schematic diagram of the timing sequence of the input voltage and control signal of the discharge protection device according to some embodiments of the present case; Figure 4 is a schematic diagram of the circuit state of the discharge circuit of the discharge protection device according to some embodiments of the present case; Figure 5 is a schematic diagram of the circuit state of the discharge circuit of the discharge protection device according to some embodiments of the present application; and FIG. 6 is a schematic diagram of the timing sequence of the input voltage and the control signal of the discharge protection device according to some embodiments of the present invention.

100: discharge protection device

110: load

120: discharge circuit

130: electronic insurance chip

PD: signal output pin

900: external power supply

Claims (10)

A discharge protection device, comprising: a load; An electronic fuse chip is used to detect an input voltage of an external power supply, wherein if the input voltage is lower than a first preset voltage, the electronic fuse chip is used to generate a control signal; and A discharge circuit, coupled to the electronic fuse chip and the load, is used to receive the control signal, so as to guide the input voltage of the external power supply to a ground terminal according to the control signal. The discharge protection device as described in Claim 1, wherein the electronic insurance chip includes: a voltage input pin for receiving the input voltage of the external power supply; a voltage output pin, coupled to the load, and used to generate an output voltage to the load according to the input voltage; and A signal output pin is coupled to the discharge circuit and used for generating the control signal according to the input voltage. The discharge protection device according to claim 2, wherein if the input voltage is higher than a second preset voltage, the electronic fuse chip is turned off to form a first disconnection between the external power supply and the load. The discharge protection device as described in claim 2, wherein the discharge circuit includes: a first node coupled to the signal output pin of the electronic insurance chip; a second node; and A first transistor, comprising: a first terminal coupled to the second node; a second terminal coupled to the ground terminal; and A control terminal, coupled to the first node, is used for conducting in response to a first level of the control signal of the first node. The discharge protection device as described in Claim 4, wherein the discharge circuit further includes: A second transistor, comprising: a first end, coupled to the electronic insurance chip and the load; a second terminal coupled to the ground terminal; and A control terminal is coupled to the second node and used for conducting in response to a second level of the second node. The discharge protection device as described in claim 5, wherein the discharge circuit further includes: A first voltage divider circuit is coupled to the first node and the control terminal of the first transistor, and is used to receive the input voltage and adjust the input voltage according to the first level of the control signal. The discharge protection device as described in Claim 6, wherein the discharge circuit further includes: A second voltage divider circuit, coupled to the second node, the first end of the first transistor and the control end of the second transistor, and used to receive the input voltage, and according to the second node the second level to adjust the input voltage. The discharge protection device as described in Claim 7, wherein the discharge circuit further includes: A current limiting circuit, coupled to the electronic fuse chip, the load and the first terminal of the second transistor, and used to detect the output voltage, wherein if the output voltage is between the electronic fuse chip and the load When a current exceeds a preset current, the current limiting circuit is used to disconnect to form a second disconnection circuit. The discharge protection device as described in Claim 8, wherein if the input voltage is not lower than the first preset voltage, the electronic insurance chip is used to adjust the control signal to the first level and transmit the control signal to the first node, so that the first transistor is turned on, and then the second transistor is turned off. The discharge protection device as described in claim 9, wherein if the input voltage is lower than the first preset voltage, the electronic insurance chip is used to adjust the control signal to a third level and transmit the control signal to The first node is used to turn off the first transistor and turn on the second transistor so as to guide the input voltage of the external power supply to the ground terminal through the current limiting circuit and the second transistor.

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