CN218648565U - Overcurrent protection circuit of optical module and optical module - Google Patents

Abstract

The utility model discloses an overcurrent protection circuit of an optical module and the optical module. The overcurrent protection circuit of the optical module includes a main board power supply, a current sampling circuit, a power switch, a load and a comparator; the input terminal of the current sampling circuit is connected to the The output end of the mainboard power supply is connected; the current sampling circuit is used to detect the supply current of the mainboard power supply; the power switch is connected to the output end of the current sampling circuit; the load is connected to the power switch; The first input end of the comparator is connected to the output end of the current sampling circuit, the output end of the comparator is connected to the power switch, and the comparator is used to control the power switch according to the supply current. Working state: According to the technical solution provided by the utility model, the components inside the optical module can be protected to avoid potential safety hazards.

Description

Optical module overcurrent protection circuit and optical module

technical field

The utility model relates to the field of electronic circuits, in particular to an overcurrent protection circuit of an optical module and the optical module.

Background technique

As the transmission rate of the optical module increases, the power consumption of the optical module becomes larger and larger, making the design of the safety circuit of the optical module one of the problems to be solved urgently. At present, the optical module is only designed to prevent current surges in the power input part, and does not have a design for controlling the abnormal high current of the optical module; when the current flowing through the optical module is too large, the internal Components are easily damaged, which leads to certain safety hazards when using optical modules.

Utility model content

The utility model aims at at least solving one of the technical problems existing in the prior art. For this reason, the utility model proposes an overcurrent protection circuit of an optical module and an optical module, which can protect components inside the optical module and avoid potential safety hazards.

The embodiment of the first aspect of the utility model provides an overcurrent protection circuit for an optical module, including a motherboard power supply, a current sampling circuit, a power switch, a load, and a comparator; the input end of the current sampling circuit and the output of the motherboard power supply The current sampling circuit is used to detect the supply current of the motherboard power supply; the power switch is connected to the output terminal of the current sampling circuit; the load is connected to the power switch; the first comparator An input terminal is connected to the output terminal of the current sampling circuit, an output terminal of the comparator is connected to the power switch, and the comparator is used to control the working state of the power switch according to the supply current.

The overcurrent protection circuit of the optical module provided according to the embodiment of the present invention has at least the following beneficial effects: the power supply of the motherboard is used to output the power supply current, and the power supply current supplies power to the load through the current sampling circuit and the power switch; wherein, the current sampling circuit is used for Detect the power supply current, and the comparator can control the working state of the power switch according to the size of the power supply current, so as to control the on-off path of the mainboard power supply to the load; when the power supply current output by the mainboard power supply is too large, the comparator can output low Level, so that the power switch is turned off, thereby cutting off the power supply path of the mainboard power supply to the load, so as to protect the components inside the optical module and avoid potential safety hazards.

According to some embodiments of the present utility model, it also includes a DAC module, the DAC module is used to output the voltage threshold value, the DAC module is connected to the second input terminal of the comparator, and the comparator is used to compare the The sampling voltage converted from the supply current and the voltage threshold value, when the sampling voltage is greater than the voltage threshold value, the power switch is turned off.

According to some embodiments of the present utility model, the current sampling circuit includes a current sampling chip, the input end of the current sampling chip is connected to the output end of the motherboard power supply, and the output end of the current sampling chip is respectively connected to the power supply The switch is connected to the first input terminal of the comparator.

According to some embodiments of the present utility model, it also includes a first resistor, one end of the first resistor is respectively connected to the output end of the current sampling chip and the first input end of the comparator, and the first resistor The other end is grounded.

According to some embodiments of the present invention, a first capacitor is further included, and the first capacitor is connected in parallel with the first resistor.

According to some embodiments of the present invention, it further includes a second resistor, one end of the second resistor is respectively connected to the mainboard power supply and the input end of the current sampling chip, and the other end of the second resistor is respectively connected to the input end of the current sampling chip. The output end of the current sampling chip is connected to the power switch.

According to some embodiments of the present invention, a second capacitor is further included, one end of the second capacitor is respectively connected to the output end of the current sampling chip and the power switch, and the other end of the second capacitor is grounded.

According to some embodiments of the present invention, it further includes a third capacitor and a fourth capacitor, one end of the third capacitor is respectively connected to the power switch and the load, the other end of the third capacitor is grounded, and the The fourth capacitor is connected in parallel with the third capacitor.

According to some embodiments of the present invention, a VCC power supply is further included, and the VCC power supply is connected to the power supply terminal of the comparator.

The embodiment of the second aspect of the utility model provides an optical module, including the overcurrent protection circuit of the optical module as described in the embodiment of the first aspect.

The optical module provided according to the utility model has at least the following beneficial effects: the power supply of the motherboard is used to output the power supply current, and the power supply current supplies power to the load through the current sampling circuit and the power switch; wherein, the current sampling circuit is used to detect the power supply current, and the comparator can According to the size of the power supply current, the working state of the power switch is controlled, thereby controlling the on-off of the path from the motherboard power supply to the load; when the power supply current output by the motherboard power supply is too large, the comparator can output a low level, so that the power switch is turned off cut off, so as to cut off the power supply path of the mainboard power supply to the load, so as to protect the components inside the optical module and avoid potential safety hazards.

Description of drawings

Additional aspects and advantages of the present invention will become apparent and understandable from the description of the embodiments in conjunction with the following drawings, in which:

Fig. 1 is a schematic structural diagram of an overcurrent protection circuit of an optical module according to an embodiment of the present invention;

Fig. 2 is a schematic circuit diagram of an overcurrent protection circuit of an optical module according to some embodiments of the present invention.

Detailed ways

Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model, but should not be construed as limiting the present utility model.

In the description of the present utility model, it should be understood that when it comes to orientation descriptions, for example, the orientations or positional relationships indicated by up, down, front, back, left, right, etc. are based on the orientations or positional relationships shown in the accompanying drawings, only It is for the convenience of describing the utility model and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the utility model.

In the description of the present utility model, several means one or more, and multiple means two or more. Greater than, less than, exceeding, etc. are understood as not including the original number, and above, below, within, etc. are understood as including the original number. If the description of the first and second is only for the purpose of distinguishing the technical features, it cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features relation.

In the description of the utility model, unless otherwise clearly defined, words such as setting, installation, and connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above-mentioned words in the utility model in combination with the specific content of the technical solution .

As shown in Figures 1 to 2, the embodiment of the first aspect of the present invention provides an overcurrent protection circuit for an optical module, including a motherboard power supply 100, a current sampling circuit 200, a power switch 300, a load 400 and a comparator 500; The input end of the sampling circuit 200 is connected with the output end of the mainboard power supply 100; the current sampling circuit 200 is used to detect the supply current of the mainboard power supply 100; the power switch 300 is connected with the output end of the current sampling circuit 200; the load 400 is connected with the power switch 300; The first input terminal of the comparator 500 is connected to the output terminal of the current sampling circuit 200 , the output terminal of the comparator 500 is connected to the power switch 300 , and the comparator 500 is used to control the working state of the power switch 300 according to the supply current.

According to the overcurrent protection circuit of the optical module provided by the embodiment of the present invention, the motherboard power supply 100 is used to output the power supply current, and the power supply current supplies power to the load 400 through the current sampling circuit 200 and the power switch 300; wherein, the current sampling circuit 200 is used to detect Supply current, the comparator 500 can control the operating state of the power switch 300 according to the size of the supply current, thereby controlling the on-off of the path for the mainboard power supply 100 to supply power to the load 400; The switch 500 can output a low level, so that the power switch 300 is turned off, thereby cutting off the power supply path of the mainboard power supply 100 to the load 400, so as to protect the components inside the optical module and avoid potential safety hazards.

It should be noted that after the motherboard power supply 100 outputs the supply current, the current sampling circuit 200 can convert the detected supply current and output it to the comparator 500 for judgment, and the comparator 500 can control the power switch according to the magnitude of the supply current 300 working state; when the power supply current is in the normal range, the comparator 500 can output a high level to turn on the power switch 300, and the optical module works normally; when the connected power supply current exceeds the normal range value, the comparator 500 can output The low level turns off the power switch 300, and the optical module stops working, thereby preventing the internal components of the optical module from being damaged by high current; that is, in the case of high current, the comparator 500 can cut off the power supply path of the mainboard power supply 100 to the load 400 , which can further protect the load 400 and avoid potential safety hazards.

As shown in Figure 1, according to some embodiments of the present utility model, it also includes a DAC module 600, the DAC module 600 is used to output the voltage threshold value, the DAC module 600 is connected with the second input terminal of the comparator 500, and the comparator 500 uses The power switch 300 is turned off when the sampled voltage is greater than the voltage threshold after comparing the converted power supply current with the sampled voltage.

It should be noted that the staff can set a specific voltage threshold value in the DAC module 600 according to the bearing capacity of the load 400 , which is not specifically limited here. After setting a specific voltage threshold value, the DAC module 600 can output the voltage threshold value to the comparator 500, so that the comparator 500 can compare the sampling voltage connected to the first input terminal and the DAC module 600 connected to the second input terminal. The voltage threshold value is compared. When the sampling voltage is greater than the voltage threshold value, it means that there is an overcurrent phenomenon, and the comparator 500 outputs a low level, and the power switch 300 is turned off, so as to cut off the path between the mainboard power supply 100 and the load 400, and stop supplying power to the load 400; When the sampling voltage is less than the voltage threshold value, it means that the current flowing through the current sampling circuit 200 is within the normal range, then the comparator 500 outputs a high level, and the power switch 300 is turned on to connect the path between the mainboard power supply 100 and the load 400, so that The optical module works normally. The overcurrent protection circuit of this embodiment can protect components inside the optical module when the current is too large, and avoid potential safety hazards.

As shown in Figure 2, according to some embodiments of the present utility model, the current sampling circuit 200 includes a current sampling chip U1, the input end of the current sampling chip U1 is connected to the output end of the motherboard power supply 100, and the output end of the current sampling chip U1 is respectively connected to the The power switch 300 is connected to the first input terminal of the comparator 500 .

It should be noted that the current sampling circuit 200 includes a current sampling chip U1. When the power supply current output by the motherboard power supply 100 is too large, it means that the current flowing through the current sampling chip U1 is too large, and the current sampling chip U1 outputs a corresponding current signal. It is convenient for the comparator 500 to judge.

As shown in Figure 2, according to some embodiments of the present utility model, it also includes a first resistor R1, one end of the first resistor R1 is respectively connected to the output end of the current sampling chip U1 and the first input end of the comparator 500, the first The other end of the resistor R1 is grounded.

It should be noted that the overcurrent protection circuit of the optical module also includes a first resistor R1, the first resistor R1 is respectively connected to the output terminal of the current sampling chip U1 and the first input terminal of the comparator 500, and the current sampling chip U1 can detect The obtained supply current is converted into a sampling voltage by the first resistor R1 and then transmitted to the first input terminal of the comparator 500, so that the comparator 500 can gate the sampling voltage connected to the first input terminal and the voltage gate connected to the second input terminal. limit value for comparison.

As shown in FIG. 2 , according to some embodiments of the present invention, a first capacitor C1 is further included, and the first capacitor C1 is connected in parallel with the first resistor R1 .

It should be noted that the overcurrent protection circuit of the optical module is also provided with a first capacitor C1, one end of the first capacitor C1 is connected to the first resistor R1, and the other end of the first capacitor C1 is connected to the first input end of the comparator 500 ; The sampling voltage converted by the first resistor R1 is filtered by the first capacitor C1 and then sent to the first input terminal of the comparator 500, and the comparator 500 can connect the sampling voltage connected to the first input terminal and the second input terminal The input voltage threshold value is compared, and the working state of the power switch 300 is controlled according to the comparison result, so as to protect the internal components of the optical module from being damaged.

As shown in Figure 2, according to some embodiments of the present invention, it also includes a second resistor R2, one end of the second resistor R2 is respectively connected to the main board power supply 100 and the input end of the current sampling chip U1, and the other end of the second resistor R2 They are respectively connected to the output end of the current sampling chip U1 and the power switch 300 .

It should be noted that the overcurrent protection circuit of the optical module is also provided with a second resistor R2, and the second resistor R2 is respectively connected to the motherboard power supply 100 and the current sampling chip U1, and the power supply current output by the motherboard power supply 100 flows through the second resistor R2. This enables the current sampling chip U1 to perform current sampling according to the voltage difference between the two ends of the second resistor R2.

As shown in Figure 2, according to some embodiments of the present utility model, it also includes a second capacitor C2, one end of the second capacitor C2 is respectively connected to the output end of the current sampling chip U1 and the power switch 300, and the other end of the second capacitor C2 grounded.

It should be noted that the overcurrent protection circuit of the optical module is also provided with a second capacitor C2, and the second capacitor C2 is respectively connected to the current sampling chip U1 and the power switch 300, which can play a filtering role, thereby ensuring the overcurrent of the optical module. The protection circuit works stably.

As shown in Figure 2, according to some embodiments of the present utility model, a third capacitor C3 and a fourth capacitor C4 are also included, one end of the third capacitor C3 is connected to the power switch 300 and the load 400 respectively, and the other end of the third capacitor C3 Grounded, the fourth capacitor C4 is connected in parallel with the third capacitor C3.

It should be noted that the overcurrent protection circuit of the optical module is also provided with a third capacitor C3 and a fourth capacitor C4. When the power switch 300 is turned on, the power supply current output by the motherboard power supply 100 can pass through the current sampling circuit 200 and the comparator. 500, the power switch 300, the third capacitor C3 and the fourth capacitor C4 are transmitted to the load 400, thereby supplying power to the load 400; here the third capacitor C3 and the fourth capacitor C4 have a filtering function, which can ensure that the load 400 is in a stable Working state, to further protect the components inside the optical module.

As shown in FIG. 2 , according to some embodiments of the present invention, a VCC power supply 700 is also included, and the VCC power supply 700 is connected to the power supply terminal of the comparator 500 .

It should be noted that the overcurrent protection circuit of the optical module is also provided with a VCC power supply 700, which is connected to the power supply terminal of the comparator 500 and used to supply power to the comparator 500 so that the comparator 500 can always be in a normal working state.

The embodiment of the second aspect of the present invention provides an optical module, including the overcurrent protection circuit of the optical module in the embodiment of the first aspect above.

The optical module provided according to the utility model includes a main board power supply 100, a current sampling circuit 200, a power switch 300, a load 400 and a comparator 500; the input end of the current sampling circuit 200 is connected with the output end of the main board power supply 100; the current sampling circuit 200 It is used to detect the supply current of the motherboard power supply 100; the power switch 300 is connected to the output end of the current sampling circuit 200; the load 400 is connected to the power switch 300; the first input end of the comparator 500 is connected to the output end of the current sampling circuit 200, and compared The output end of the comparator 500 is connected to the power switch 300, and the comparator 500 is used to control the working state of the power switch 300 according to the supply current.

According to the optical module provided by the utility model, the motherboard power supply 100 is used to output the power supply current, and the power supply current supplies power to the load 400 through the current sampling circuit 200, the comparator 500 and the power switch 300; wherein, the current sampling circuit 200 is used to detect the power supply current, The comparator 500 can control the working state of the power switch 300 according to the size of the supply current, thereby controlling the on-off of the path for the mainboard power supply 100 to supply power to the load 400; Output low level, so that the power switch 300 is turned off, thereby cutting off the power supply path from the mainboard power supply 100 to the load 400, so as to protect the components inside the optical module and avoid potential safety hazards.

It should be noted that the embodiment of the utility model can realize the overcurrent protection of the optical module circuit through the hardware structure, and does not involve the improvement of the method.

The above embodiments of the utility model have been described in detail in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned embodiments. , making various changes.

Claims (10)

1. An overcurrent protection circuit of an optical module, characterized in that, comprising: motherboard power supply; A current sampling circuit, the input end of the current sampling circuit is connected to the output end of the motherboard power supply; the current sampling circuit is used to detect the supply current of the motherboard power supply; a power switch, the power switch is connected to the output end of the current sampling circuit; a load, the load is connected to the power switch; A comparator, the first input terminal of the comparator is connected to the output terminal of the current sampling circuit, the output terminal of the comparator is connected to the power switch, and the comparator is used to control the The working state of the power switch. 2. The overcurrent protection circuit of the optical module according to claim 1, further comprising a DAC module, the DAC module is used to output a voltage threshold value, and the second DAC module and the comparator The input end is connected, and the comparator is used for comparing the sampling voltage converted from the supply current with the voltage threshold value, and when the sampling voltage is greater than the voltage threshold value, the power switch is turned off. 3. The overcurrent protection circuit of the optical module according to claim 2, wherein the current sampling circuit comprises a current sampling chip, the input end of the current sampling chip is connected to the output end of the mainboard power supply, and the The output terminals of the current sampling chip are respectively connected with the power switch and the first input terminal of the comparator. 4. The overcurrent protection circuit of the optical module according to claim 3, further comprising a first resistor, one end of the first resistor is connected to the output end of the current sampling chip and the comparator respectively. The first input end is connected, and the other end of the first resistor is grounded. 5 . The overcurrent protection circuit of the optical module according to claim 4 , further comprising a first capacitor connected in parallel with the first resistor. 6. The overcurrent protection circuit of the optical module according to claim 3, further comprising a second resistor, one end of the second resistor is respectively connected to the main board power supply and the input end of the current sampling chip , the other end of the second resistor is respectively connected to the output end of the current sampling chip and the power switch. 7. The overcurrent protection circuit of the optical module according to claim 3, further comprising a second capacitor, one end of the second capacitor is respectively connected to the output end of the current sampling chip and the power switch , the other end of the second capacitor is grounded. 8. The overcurrent protection circuit of the optical module according to claim 1, further comprising a third capacitor and a fourth capacitor, one end of the third capacitor is respectively connected to the power switch and the load, The other end of the third capacitor is grounded, and the fourth capacitor is connected in parallel with the third capacitor. 9. The overcurrent protection circuit of the optical module according to claim 1, further comprising a VCC power supply, the VCC power supply being connected to the power supply terminal of the comparator. 10. An optical module, comprising an overcurrent protection circuit of the optical module according to any one of claims 1 to 9.

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