A low-power PUMP driver circuit

Abstract

This invention provides a low-power pump driver circuit, comprising a DC-DC module, wherein a standard input voltage is connected to the first terminal of the DC-DC module, and the required output voltage is output from the second terminal; a first digital-to-analog converter (DAC) for adjusting the output voltage of the DC-DC module, and the first DAC is electrically connected to the third terminal of the DC-DC module; a pump laser for realizing optical output, and the first terminal of the pump laser is electrically connected to the second terminal of the DC-DC module; a second DAC for controlling the drive current of the pump laser, and the second DAC is electrically connected to the first terminal of an operational amplifier; and an N-type MOSFET, the first terminal of which is electrically connected to the second terminal of the pump laser, the second terminal of which is electrically connected to the third terminal of the operational amplifier, and the third terminal of which is electrically connected to the first terminal of a sampling resistor. The low-power pump driver circuit provided by this invention reduces circuit power consumption and cost by introducing a first DAC into the DC-DC module for personalized voltage adjustment.

Description

Technical Field

[0001] This utility model relates to the field of optical network technology, and in particular to a low-power PUMP driving circuit. Background Technology

[0002] In the prior art, because a fixed voltage is used in the circuit, the forward voltage and current of the PUMP laser differ greatly. This results in a voltage difference on the MOSFET, which generates a lot of heat and affects the lifespan of the MOSFET.

[0003] Therefore, it is necessary to provide a low-power PUMP drive circuit to effectively solve or partially solve the above problems. Utility Model Content

[0004] This invention provides a low-power PUMP drive circuit. By introducing a first digital-to-analog converter into the DC-DC module, the voltage can be adjusted in a personalized manner, thereby reducing circuit power consumption and cost.

[0005] This utility model embodiment provides a low-power PUMP driving circuit, including:

[0006] A DC-DC module is used to convert a standard input voltage into a desired output voltage. The first terminal of the DC-DC module is connected to the standard input voltage, and the second terminal of the DC-DC module outputs the desired output voltage.

[0007] A first digital-to-analog converter is used to regulate the output voltage of the DC-DC module, and the first digital-to-analog converter is electrically connected to the third terminal of the DC-DC module;

[0008] A pump laser for achieving optical output, wherein a first end of the pump laser is electrically connected to a second end of the DC-DC module;

[0009] A second digital-to-analog converter is used to control the drive current of the pump laser, and the second analog-to-digital converter is electrically connected to the first terminal of the operational amplifier;

[0010] An N-type MOS transistor is provided, wherein the first terminal of the N-type MOS transistor is electrically connected to the second terminal of the pump laser, the second terminal of the N-type MOS transistor is electrically connected to the third terminal of the operational amplifier, and the third terminal of the N-type MOS transistor is electrically connected to the first terminal of the sampling resistor.

[0011] The first end of the sampling resistor is also electrically connected to the second end of the operational amplifier.

[0012] Preferably, the standard input voltage is 5V.

[0013] Preferably, the sampling resistor is 0.3 ohms.

[0014] Preferably, the N-type MOS transistor is of model TO252.

[0015] Preferably, the control current of the first digital-to-analog converter is 2.4A.

[0016] Preferably, the control current of the second digital-to-analog converter is 2.4A.

[0017] Preferably, the second terminal of the sampling resistor is grounded.

[0018] Preferably, the first terminal of the operational amplifier receives the input signal from the second digital-to-analog converter, and the third terminal of the operational amplifier outputs a signal to control the N-type MOS transistor by comparing it with the feedback signal from the second terminal of the operational amplifier.

[0019] Preferably, the N-type MOS transistor is a linear adjustment element.

[0020] Compared with the prior art, the technical solution of this utility model embodiment has the following beneficial effects:

[0021] This utility model provides a low-power PUMP driving circuit, including a DC-DC module for converting a standard input voltage into a desired output voltage. The first terminal of the DC-DC module is connected to the standard input voltage, and the second terminal outputs the desired output voltage. A first digital-to-analog converter (DAC) is used to adjust the output voltage of the DC-DC module, and the first DAC is electrically connected to the third terminal of the DC-DC module. A pump laser is used to achieve optical output, and the first terminal of the pump laser is electrically connected to the second terminal of the DC-DC module. A second DAC is also included. A converter is used to control the drive current of the pump laser. The second analog-to-digital converter is electrically connected to the first terminal of the operational amplifier. An N-type MOS transistor is included, with its first terminal electrically connected to the second terminal of the pump laser, its second terminal electrically connected to the third terminal of the operational amplifier, and its third terminal electrically connected to the first terminal of a sampling resistor. The first terminal of the sampling resistor is also electrically connected to the second terminal of the operational amplifier. By introducing a first digital-to-analog converter into the DC-DC module, the voltage can be adjusted individually, thereby reducing circuit power consumption and cost. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model, not all embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of a low-power PUMP drive circuit provided in one embodiment of the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] The technical solution of this utility model will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0026] In view of the problems existing in the prior art, this utility model provides a PUMP driving circuit.

[0027] Figure 1 This is a schematic diagram of a low-power PUMP drive circuit provided in one embodiment of the present invention.

[0028] Now see Figure 1 This utility model provides a low-power PUMP drive circuit, including a DC-DC module, which is used to convert the standard input voltage VCC_5V0 into the required output voltage VCC. The first terminal of the DC-DC module is connected to the standard input voltage VCC_5V0, and the second terminal of the DC-DC module outputs the required output voltage VCC.

[0029] A first digital-to-analog converter (DAC) is used to regulate the output voltage VCC of the DC-DC module, and the first DAC is electrically connected to the third terminal of the DC-DC module.

[0030] Pump laser D2, which is used to achieve optical output, has its first end electrically connected to the second end of the DC-DC module;

[0031] The second digital-to-analog converter (PUMP-DAC) is used to control the drive current of the pump laser D2. The second PUMP-DAC is electrically connected to the first terminal +IN of the operational amplifier U2.

[0032] N-type MOS transistor Q2, the first terminal D of the N-type MOS transistor Q2 is electrically connected to the second terminal of the pump laser D2, the second terminal G of the N-type MOS transistor Q2 is electrically connected to the third terminal of the operational amplifier U2, and the third terminal S of the N-type MOS transistor Q2 is electrically connected to the first terminal of the sampling resistor R2;

[0033] The first terminal of the sampling resistor R2 is also electrically connected to the second terminal -IN of the operational amplifier U2.

[0034] Specifically, by introducing a first digital-to-analog converter (DAC) into the DC-DC module, the voltage VCC is individually adjusted to obtain the VCC voltage for constant current drive of the pump laser. As a result, the voltage drop across the N-type MOSFET Q2 can be reduced to 0.05V, resulting in a power consumption of approximately 0.12W and a temperature rise of approximately 5.16℃, which is up to 10 times lower than the previous temperature rise.

[0035] In practice, the standard input voltage is 5V.

[0036] In a specific implementation, the sampling resistor R2 is 0.3 ohms.

[0037] In specific implementation, the N-type MOS transistor Q2 is model TO252.

[0038] In a specific implementation, the control current of the first digital-to-analog converter (DAC) is 2.4A.

[0039] In a specific implementation, the control current of the second digital-to-analog converter PUMP-DAC is 2.4A.

[0040] In a specific implementation, the second end of the sampling resistor R2 is grounded.

[0041] In a specific implementation, the first terminal +IN of the operational amplifier U2 receives the input signal of the second digital-to-analog converter PUMP-DAC. By comparing it with the feedback signal of the second terminal -IN of the operational amplifier U2, the third terminal OUT of the operational amplifier outputs a signal to control the N-type MOS transistor Q2.

[0042] In a specific implementation, the N-type MOS transistor Q2 is a linear adjustment element. In summary, this utility model embodiment provides a low-power PUMP drive circuit, including a DC-DC module for converting a standard input voltage into a desired output voltage. The first terminal of the DC-DC module is connected to the standard input voltage, and the second terminal of the DC-DC module outputs the desired output voltage; a first digital-to-analog converter for adjusting the output voltage of the DC-DC module, the first digital-to-analog converter and the third terminal of the DC-DC module are electrically connected; a pump laser for achieving optical output, the first terminal of the pump laser and the second terminal of the DC-DC module are electrically connected; and a second... A digital-to-analog converter (DAC) is used to control the drive current of the pump laser. The DAC is electrically connected to the first terminal of the operational amplifier. An N-type MOSFET is included, with its first terminal electrically connected to the second terminal of the pump laser, its second terminal electrically connected to the third terminal of the operational amplifier, and its third terminal electrically connected to the first terminal of a sampling resistor. The first terminal of the sampling resistor is also electrically connected to the second terminal of the operational amplifier. By introducing a DAC into the DC-DC module, the voltage can be individually adjusted, thereby reducing circuit power consumption and cost.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model 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 or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A low-power PUMP driving circuit, characterized in that, include: A DC-DC module is used to convert a standard input voltage into a desired output voltage. The first terminal of the DC-DC module is connected to the standard input voltage, and the second terminal of the DC-DC module outputs the desired output voltage. A first digital-to-analog converter is used to regulate the output voltage of the DC-DC module, and the first digital-to-analog converter is electrically connected to the third terminal of the DC-DC module; A pump laser for achieving optical output, wherein a first end of the pump laser is electrically connected to a second end of the DC-DC module; A second digital-to-analog converter is used to control the drive current of the pump laser, and the second analog-to-digital converter is electrically connected to the first terminal of the operational amplifier; An N-type MOS transistor is provided, wherein the first terminal of the N-type MOS transistor is electrically connected to the second terminal of the pump laser, the second terminal of the N-type MOS transistor is electrically connected to the third terminal of the operational amplifier, and the third terminal of the N-type MOS transistor is electrically connected to the first terminal of the sampling resistor. The first end of the sampling resistor is also electrically connected to the second end of the operational amplifier.

2. The low-power PUMP drive circuit according to claim 1, characterized in that, The standard input voltage is 5V.

3. The low-power PUMP driving circuit according to claim 1, characterized in that, The sampling resistor is 0.3 ohms.

4. The low-power PUMP drive circuit according to claim 1, characterized in that, The N-type MOS transistor is model TO252.

5. The low-power PUMP drive circuit according to claim 1, characterized in that, The control current of the first digital-to-analog converter is 2.4A.

6. The low-power PUMP drive circuit according to claim 1, characterized in that, The control current of the second digital-to-analog converter is 2.4A.

7. The low-power PUMP drive circuit according to claim 1, characterized in that, The second terminal of the sampling resistor is grounded.

8. The low-power PUMP driving circuit according to claim 1, characterized in that, The first terminal of the operational amplifier receives the input signal from the second digital-to-analog converter. By comparing it with the feedback signal from the second terminal of the operational amplifier, the third terminal of the operational amplifier outputs a signal to control the N-type MOS transistor.

9. The low-power PUMP drive circuit according to claim 1, characterized in that, The N-type MOS transistor is a linear adjustment element.

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