Circuit structure for reducing power consumption of optical module

Abstract

The utility model relates to the technical field of optical modules, in particular to a circuit structure for reducing power consumption of an optical module, an FB pin of a DC-DC circuit is connected with a resistor R1, a resistor R2 and a divider resistor R3, and one end of the resistor R3 is connected with a DC voltage source VSet; an SW pin of the DC-DC circuit is connected with an inductor L1, and one end of the inductor L1 is connected with one end of a resistor R2; and the FB pin is a feedback pin of the DC-DC circuit. Compared with the prior art, the circuit structure for reducing the power consumption of the optical module can realize low-voltage output through one divider resistor, and can adjust the magnitude of the output voltage by changing the magnitude of the divider resistor according to requirements, so that the flexibility of circuit design is greatly improved, the voltage output range of DC-DC is expanded, and the power consumption of the optical module is reduced. The requirements of various circuits or electronic equipment on different voltages are met; the most remarkable effects are that the power supply voltage of the optical module circuit is reduced, the efficiency is improved, and the power consumption of the optical module is directly reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical module technical field, especially a circuit structure of reducing optical module power consumption. BACKGROUND

[0002] In the optical module, different circuits are often powered by different voltages, and the DC-DC converter can convert high voltage input into low voltage output to meet the needs of various electronic devices for different voltage levels. And due to its high efficiency and high stable output characteristics, it is widely used in optical modules to realize the function of voltage increase or decrease.

[0003] The buck DC-DC converter is a DC-DC power converter that converts a higher DC input voltage into a lower DC output voltage while increasing the output current. It involves the basic principles of electromagnetic induction and electric energy conversion in physics.

[0004] In the buck DC-DC converter, by controlling the input duty cycle variable PWM wave to switch on and off the switch tube, the DC voltage provided by the input power supply is converted into adjustable low voltage output.

[0005] In high-speed optical modules such as 100G / 400G / 800G optical modules, as the rate continues to grow, the power consumption of the optical module also increases.

[0006] How to reduce the power consumption of the optical module has become an important task for optical module design and optimization. The high efficiency and high flexibility design of DC-DC circuit are widely used in optical module circuit.

[0007] For optical modules, as the speed of the optical module increases, 100G / 400G / 800G modules will use DSP. In order to reduce power consumption, the DSP circuit needs a low voltage to power it, and this voltage is often lower than 0.6V. LDO can output low voltage, but LDO is low in efficiency, which is contrary to low power design.

[0008] In a typical DC-DC buck circuit, the reference voltage is 0.6V or 0.8V or even higher, and the output voltage is higher than the reference voltage. This cannot meet the needs of optical modules for low voltage (such as below 0.6V), making it difficult to design circuits and increasing the power consumption of optical modules. SUMMARY

[0009] In order to overcome the above problems, the utility model provides a circuit structure for reducing the power consumption of the optical module, which can effectively solve the above problems.

[0010] The utility model provides a technical scheme that solves above-mentioned technical problem provides a kind of circuit structure for reducing the power consumption of optical module, including DC-DC circuit, the FB foot of DC-DC circuit is connected with resistance R1, resistance R2 and voltage dividing resistance R3, and one end of resistance R3 is connected with direct current voltage source V_Set;The SW foot of DC-DC circuit is connected with inductance L1, and one end of inductance L1 is connected with one end of resistance R2;FB foot is the feedback pin of DC-DC circuit.

[0011] Preferably, the circuit structure for reducing the power consumption of optical module includes filter circuit C1 and filter circuit C3, one end of filter circuit C1 and filter circuit C3 is connected and then commonly connected to one end of resistance R2.

[0012] Preferably, one end of filter circuit C3 is connected with load resistance Rload.

[0013] Preferably, direct current voltage source V_Set is shared with the input voltage of DC-DC.

[0014] Preferably, voltage dividing resistance R3 is connected in series with the FB foot of DC-DC circuit.

[0015] Compared with prior art, the circuit structure for reducing the power consumption of optical module of the utility model can realize low voltage output through a voltage dividing resistance, and can also change the size of voltage dividing resistance to adjust the size of output voltage according to demand, greatly increase the flexibility of circuit design, expand the voltage output range of DC-DC, meet the demand of various circuits or electronic equipment for different voltages. The most remarkable effect is that the power supply voltage of optical module circuit is reduced, the efficiency is increased, and the power consumption of optical module is directly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the principle diagram of the circuit structure for reducing the power consumption of optical module of the utility model;

[0017] Figure 2 It is the first simulation result diagram of the utility model for reducing the power consumption of optical module;

[0018] Figure 3 It is the second simulation result diagram of the utility model for reducing the power consumption of optical module. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantage of the utility model more clear and obvious, the utility model is further explained in detail in the following by combining with drawing and embodiment. It should be understood that the specific embodiment described here is only used to explain the utility model, and is not used to limit the utility model.

[0020] It should be noted that in this embodiment of the invention, all directional indications (such as up, down, left, right, front, back, etc.) are limited to relative positions on the specified view, rather than absolute positions.

[0021] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0022] Please see Figures 1 to 3 The circuit structure for reducing the power consumption of optical modules according to this utility model includes a DC-DC circuit. The FB pin of the DC-DC circuit is connected to resistors R1, R2 and voltage divider resistor R3. One end of resistor R3 is connected to a DC voltage source V_Set.

[0023] The SW pin of the DC-DC circuit is connected to an inductor L1, and one end of the inductor L1 is connected to one end of the resistor R2.

[0024] The FB pin is the feedback pin of the DC-DC circuit.

[0025] The circuit structure for reducing the power consumption of the optical module of this utility model includes a filter circuit C1 and a filter circuit C3. One end of the filter circuit C1 and the filter circuit C3 are connected together and connected to one end of the resistor R2.

[0026] One end of the filter circuit C3 is connected to a load resistor Rload.

[0027] The circuit structure of this invention for reducing the power consumption of optical modules adds a DC voltage source to the feedback pin FB in a typical DC-DC step-down circuit, so that the output voltage is lower than the reference voltage, thereby meeting the low voltage requirement of the optical module and reducing the power consumption of the module.

[0028] The DC voltage source V_Set can be shared with the input voltage of the DC-DC converter, that is, V_Set can take the same supply voltage as the DC-DC converter, saving circuit space.

[0029] The voltage divider resistor R3 is connected in series with the FB pin of the DC-DC circuit. By adjusting the value of the voltage divider resistor R3, an output voltage VOUT lower than VFB can be obtained.

[0030] Depend on Figure 1 As shown, assuming the current in R2 flows from pin FB to pin OUT, Kirchhoff's laws can be used to derive the following formula:

[0031] I(R3) = I(R1) + I(R2), that is:

[0032] (V_Set-VFB) / R3=VFB / R1+(VFB-VOUT) / R2

[0033] VOUT=(1+R2 / R1+R2 / R3)*VFB-(R2 / R3)*V_Set

[0034] When the reference voltage VFB = 0.6V, R1 = 100K, R2 = 20K, R3 = 245K, and V_Set = 3.3V, we can obtain:

[0035] With VOUT = 0.499V, an output voltage VOUT lower than the reference voltage VFB can be obtained, which meets the circuit requirements for low voltage power supply and reduces the power consumption of the optical module.

[0036] This invention discloses a circuit structure for reducing the power consumption of optical modules. The output voltage can be adjusted by regulating the voltage divider resistors connected to the output and FB feedback terminals, thereby meeting the power supply requirements of different circuits. By selecting high-precision voltage divider resistors, a very high-precision output voltage can be achieved. Because the circuit uses pulse modulation via a switching transistor, its energy efficiency is typically higher than that of linear voltage regulator circuits, significantly reducing energy consumption and improving energy utilization. Furthermore, the synergistic effect of inductors and capacitors helps maintain the stability of the output voltage.

[0037] Depend on Figure 1 As shown, I1 is the current flowing through R1, I2 is the current flowing through R2, and I3 is the current flowing through the voltage divider resistor R3. V_Set is the DC voltage source, C1 and C3 are filter capacitors, and Rload is the load resistor.

[0038] From Kirchhoff's laws, we get: I3 = I1 + I2, that is:

[0039] (V_Set-VFB) / R3=VFB / R1+(VFB-VOUT) / R2

[0040] VOUT=(1+R2 / R1+R2 / R3)*VFB-(R2 / R3)*V_Set

[0041] For a DC-DC converter with a reference voltage of 0.6V,

[0042] VFB=0.6V, R1=100K, R2=20K,

[0043] When R3 = 245K and V_Set = 3.3V, VOUT = 0.499V can be obtained;

[0044] When R3 = 350K and V_Set = 3.3V, VOUT = 0.565V can be obtained;

[0045] When a certain low voltage output is needed, the element values are substituted into the formula to calculate its size.

[0046] Figure 2 and Figure 3 The circuit simulation results are obtained by using the circuit structure. The element values calculated by the above formula, i.e. the reference voltage VFB=0.6V, R1=100K, R2=20K, R3=245K, V_Set=3.3V, the circuit simulation obtains VOUT=0.499V. VOUT is lower than the reference voltage, and the simulation result is consistent with the actual circuit.

[0047] According to the simulation result, for the DC-DC circuit with only 0.6V reference voltage, as long as a DC voltage source and a voltage dividing resistor are added to the feedback pin FB, and as long as the resistor is adjusted to a suitable value, the current flowing through the resistor R2 can be changed to flow from the feedback pin FB to the output end, so that a lower voltage output is obtained while the circuit efficiency is ensured, and the power consumption of the optical module is reduced.

[0048] Compared with the prior art, the circuit structure for reducing the power consumption of the optical module can realize low voltage output through a voltage dividing resistor, and the size of the voltage dividing resistor can be changed to adjust the size of the output voltage according to the requirement, so that the flexibility of the circuit design is greatly increased, the voltage output range of the DC-DC is expanded, and the requirement of various circuits or electronic devices for different voltages is met. The most remarkable effect is that the power supply voltage of the optical module circuit is reduced, the efficiency is increased, and the power consumption of the optical module is directly reduced.

[0049] The above only describes the preferred embodiments of the utility model, and does not limit the patent range of the utility model, and any modification, equivalent replacement and improvement within the concept of the utility model should be included in the patent protection range of the utility model.

Claims

1. A circuit structure for reducing the power consumption of an optical module, characterized in that, The DC-DC circuit comprises a FB pin connected with a resistor R1, a resistor R2 and a voltage dividing resistor R3, one end of the resistor R3 being connected with a direct current voltage source V_Set. One end of the inductor L1 is connected with one end of the resistor R2. The FB pin is a feedback pin of the DC-DC circuit.

2. The circuit structure for reducing power consumption of an optical module according to claim 1, wherein, The circuit structure for reducing the power consumption of the optical module comprises a filter circuit C1 and a filter circuit C3, one end of the filter circuit C1 and the filter circuit C3 being connected and then commonly connected to one end of the resistor R2.

3. The circuit structure for reducing power consumption of an optical module according to claim 2, wherein, One end of the filter circuit C3 is connected with a load resistor Rload.

4. The circuit structure for reducing power consumption of an optical module according to claim 1, wherein, The direct current voltage source V_Set is shared with an input voltage of the DC-DC.

5. The circuit structure for reducing power consumption of an optical module according to claim 1, wherein, The voltage dividing resistor R3 is connected in series with the FB pin of the DC-DC circuit.

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