Low-power-consumption reference circuit

Abstract

According to the technical scheme, the low-power-consumption reference circuit is characterized in that the low-power-consumption reference circuit comprises a power module, one side of the power module is electrically connected with a differential module, the power module is further connected with a band-gap reference circuit and a sampling hold circuit, and the power module comprises a DC-DC module chip; the power supply module comprises three capacitors, the differential module comprises an operational amplifier uA741, and the differential module further comprises four resistors. The band-gap reference circuit is adopted, and the band-gap reference circuit obtains reference voltage with a zero temperature coefficient through proper weight superposition by utilizing a negative temperature coefficient of base-emitter voltage of a bipolar transistor and a positive temperature coefficient of a difference between base-emitter voltage of two triodes with different current densities. Power consumption can be reduced.

Description

Technical Field

[0001] The present invention relates to the field of circuits, and in particular to a low-power consumption reference circuit. Background Art

[0002] Low-power reference circuits are widely used in smart devices, especially in reducing power consumption and improving device endurance.

[0003] The existing Chinese patent with publication number CN119270976A discloses a low-power reference circuit, which is characterized by comprising: a bandgap reference circuit, which is used to generate a reference voltage in a working state; a sampling and holding circuit, which is connected to the bandgap reference circuit, which is used to receive the reference voltage and hold and output the reference voltage; a control circuit, which is respectively connected to the bandgap reference circuit and the sampling and holding circuit, and is used to control the bandgap reference circuit to exit the working state and disconnect the connection between the sampling and holding circuit and the bandgap reference circuit in the output control of each cycle.

[0004] Another example is a Chinese patent with a publication number of CN110502061A, which discloses an ultra-low power consumption reference circuit, including: a startup circuit for starting the reference circuit; a core circuit, which optimizes the use of a three-branch current structure on a current mirror structure, and selects MOS tubes with different gate oxide thicknesses to eliminate temperature effects and obtain a stable reference current; an output circuit, which stacks transistors in series to amplify the reference voltage. Summary of the invention

[0005] In view of the problems mentioned in the background technology, an object of the present invention is to provide a low-power reference circuit to solve the problems mentioned in the background technology.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] A low-power reference circuit includes a power module, one side of the power module is electrically connected to a differential module, a bandgap reference circuit and a sample-and-hold circuit are also connected to the power module, the power module includes a DC-DC module chip, the power module includes three capacitors, the three capacitors are electrically connected to the two sides of the DC-DC module chip, the differential module includes an operational amplifier uA741, the differential module also includes four resistors, and the four resistors are electrically connected to the operational amplifier uA741.

[0008] By adopting the above technical scheme, the present application adopts a bandgap reference circuit. The bandgap reference circuit obtains a reference voltage with a zero temperature coefficient by utilizing the negative temperature coefficient of the base-emitter voltage of the bipolar transistor and the positive temperature coefficient of the difference between the base-emitter voltages of two transistors with different current densities through appropriate weight superposition, thereby reducing power consumption. The present application adopts a power supply module and a differential amplifier circuit module. The power supply module adopts the Jinshengyang VRA_YMD_6WR3 model to convert the +12V power supply into a ±12V power supply. The differential module adopts the operational amplifier uA741. The differential amplifier circuit module has a simple structure, which is conducive to students' understanding. When using the differential module, only a DC regulated power supply +12V power supply needs to be used to insert the corresponding interface position, which can meet the experimental requirements and solve the power supply problem of the differential module, and change the dual-channel power supply to a single-channel power supply, thereby reducing the difficulty of the experiment and reducing power consumption.

[0009] Preferably, a first pin of the DC-DC module chip is electrically connected to a ground terminal, and a second pin of the DC-DC module chip is electrically connected to a +12V input terminal.

[0010] By adopting the above technical solution, the DC-DC module chip is powered and operated through the first pin and the second pin.

[0011] Preferably, a capacitor C1 is electrically connected between the ground terminal and the +12V input terminal, and the DC-DC module chip is a VRA_YMD_6WR3 chip.

[0012] By adopting the above technical solution, a capacitor C1 is electrically connected between the ground terminal and the +12V input terminal, so that the input voltage can be filtered, and the VRA_YMD_6WR3 chip is used to convert the input +12V power supply into ±12V power supply.

[0013] Preferably, the third pin and the fifth pin of the DC-DC module chip are electrically connected to the fourth pin and the seventh pin of the operational amplifier uA741 respectively.

[0014] By adopting the above technical solution, the DC-DC module chip is electrically connected to the operational amplifier uA741 to achieve power supply operation.

[0015] Preferably, a capacitor C2 is electrically connected between the fifth pin and the fourth pin of the DC-DC module chip, and a capacitor C3 is electrically connected between the third pin and the fourth pin of the DC-DC module chip.

[0016] By adopting the above technical solution, capacitor C2 and capacitor C3 are used to implement filtering processing on the converted voltage circuit.

[0017] Preferably, the second pin and the third pin of the operational amplifier uA741 are electrically connected to a resistor R1 and a resistor R2 respectively.

[0018] By adopting the above technical solution, the setting of the resistor R1 and the resistor R2 facilitates the maintenance of voltage stability and realizes voltage division regulation.

[0019] Preferably, one side of the capacitor C3 is electrically connected to a resistor R3, one end of the resistor R3 is electrically connected to the third pin of the operational amplifier uA741, and is electrically connected to one side of the resistor R2.

[0020] By adopting the above technical solution, the resistor R3 is used to realize the input to the positive voltage circuit and realize the voltage division adjustment.

[0021] Preferably, the sixth pin of the operational amplifier uA741 is electrically connected to an output terminal, and a resistor is electrically connected between the sixth pin and the second pin of the operational amplifier uA741.

[0022] By adopting the above technical solution, the output end can output the voltage, and the resistor can easily adjust the system.

[0023] In summary, the present invention mainly has the following beneficial effects:

[0024] The present application adopts a bandgap reference circuit. The bandgap reference circuit obtains a reference voltage with a zero temperature coefficient by utilizing the negative temperature coefficient of the base-emitter voltage of the bipolar transistor and the positive temperature coefficient of the difference between the base-emitter voltages of two transistors with different current densities through appropriate weight superposition, thereby reducing power consumption. The present application adopts a power supply module and a differential amplifier circuit module. The power supply module adopts the VRA_YMD_6WR3 model of Jinshengyang to convert the +12V power supply into a ±12V power supply. The differential module adopts the operational amplifier uA741. The differential amplifier circuit module has a simple structure, which is conducive to students' understanding. When using the differential module, only a DC regulated power supply +12V power supply needs to be used to insert the power supply into the corresponding interface position, which can meet the experimental requirements and solve the power supply problem of the differential module, and change the dual-channel power supply to a single-channel power supply, thereby reducing the difficulty of the experiment and reducing power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a circuit diagram of the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example

[0028] refer to Figure 1 A low-power reference circuit comprises a power module, one side of the power module is electrically connected to a differential module, a bandgap reference circuit and a sampling and holding circuit are also connected to the power module, the power module comprises a DC-DC module chip, the power module comprises three capacitors, the three capacitors are electrically connected to the two sides of the DC-DC module chip, the differential module comprises an operational amplifier uA741, the differential module also comprises four resistors, the four resistors are electrically connected to the operational amplifier uA741.

[0029] The present application adopts a bandgap reference circuit. The bandgap reference circuit obtains a reference voltage with a zero temperature coefficient by utilizing the negative temperature coefficient of the base-emitter voltage of the bipolar transistor and the positive temperature coefficient of the difference between the base-emitter voltages of two transistors with different current densities through appropriate weight superposition, thereby reducing power consumption. The present application adopts a power supply module and a differential amplifier circuit module. The power supply module adopts the VRA_YMD_6WR3 model of Jinshengyang to convert the +12V power supply into a ±12V power supply. The differential module adopts the operational amplifier uA741. The differential amplifier circuit module has a simple structure, which is conducive to students' understanding. When using the differential module, only a DC regulated power supply +12V power supply needs to be used to insert the power supply into the corresponding interface position, which can meet the experimental requirements and solve the power supply problem of the differential module, and change the dual-channel power supply to a single-channel power supply, thereby reducing the difficulty of the experiment and reducing power consumption.

[0030] In this embodiment, preferably, the first pin of the DC-DC module chip is electrically connected to a ground terminal, and the second pin of the DC-DC module chip is electrically connected to a +12V input terminal. The effect is that the DC-DC module chip is powered by the first pin and the second pin.

[0031] In this embodiment, preferably, a capacitor C1 is electrically connected between the ground terminal and the +12V input terminal, and the DC-DC module chip is a VRA_YMD_6WR3 chip. The effect is that the capacitor C1 is electrically connected between the ground terminal and the +12V input terminal, so that the input voltage can be filtered, and the VRA_YMD_6WR3 chip is used to convert the input +12V power supply into a ±12V power supply.

[0032] In this embodiment, preferably, the third pin and the fifth pin of the DC-DC module chip are electrically connected to the fourth pin and the seventh pin of the operational amplifier uA741 respectively. The effect is that the DC-DC module chip is electrically connected to the operational amplifier uA741 to achieve power supply operation.

[0033] In this embodiment, preferably, a capacitor C2 is electrically connected between the fifth pin and the fourth pin of the DC-DC module chip, and a capacitor C3 is electrically connected between the third pin and the fourth pin of the DC-DC module chip. The effect is that the capacitor C2 and the capacitor C3 are used to implement filtering processing on the converted voltage circuit.

[0034] In this embodiment, preferably, the second pin and the third pin of the operational amplifier uA741 are electrically connected to resistors R1 and R2 respectively. The effect is that the setting of resistors R1 and R2 facilitates the voltage to be kept stable and realizes voltage division regulation.

[0035] In this embodiment, preferably, one side of the capacitor C3 is electrically connected to a resistor R3, one end of the resistor R3 is electrically connected to the third pin of the operational amplifier uA741, and is electrically connected to one side of the resistor R2. The effect is that the resistor R3 is used to input the positive voltage circuit and realize voltage division regulation.

[0036] In this embodiment, preferably, the sixth pin of the operational amplifier uA741 is electrically connected to an output terminal, and a resistor is electrically connected between the sixth pin and the second pin of the operational amplifier uA741. The effect is that the output terminal outputs a voltage, and the resistor facilitates the adjustment of the system.

[0037] Principle and advantages of use:

[0038] Design the circuit:

[0039] The circuit diagram is mainly divided into two modules, the left is the power supply module, and the right is the differential amplifier circuit module. The DC-DC module chip in the power module adopts the VRA_YMD_6WR3 model of Goldensun, which converts the +12V power supply into ±12V power supply. The capacitor in the circuit plays a filtering role. The differential module is composed of an operational amplifier uA741 and four identical 10kΩ resistors. This differential module has a simple structure, which is conducive to students' understanding;

[0040] Making PCB circuit board:

[0041] The welding circuit uses a 2mm metal banana head at the interface, which matches most of the current teaching wires.

[0042] In the practical teaching part of the course, when a differential module is needed, you only need to use a DC regulated power supply +12V power supply and insert it into the corresponding interface position. This can meet the experimental requirements, generate ±12V power supply, and realize differential amplification through the operational amplifier uA741 and 4 identical 10kΩ resistors.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low power consumption reference circuit, comprising a power module, characterized in that: A differential module is electrically connected to one side of the power module, a bandgap reference circuit and a sample-and-hold circuit are also connected to the power module, the power module includes a DC-DC module chip, the power module includes three capacitors, the three capacitors are electrically connected to the two sides of the DC-DC module chip, the differential module includes an operational amplifier uA741, the differential module also includes four resistors, the four resistors are electrically connected to the operational amplifier uA741.

2. A low power consumption reference circuit according to claim 1, characterized in that: The first pin of the DC-DC module chip is electrically connected to a ground terminal, and the second pin of the DC-DC module chip is electrically connected to a +12V input terminal.

3. A low power consumption reference circuit according to claim 2, characterized in that: A capacitor C1 is electrically connected between the ground terminal and the +12V input terminal, and the DC-DC module chip is a VRA_YMD_6WR3 chip.

4. A low power consumption reference circuit according to claim 1, characterized in that: The third pin and the fifth pin of the DC-DC module chip are electrically connected to the fourth pin and the seventh pin of the operational amplifier uA741 respectively.

5. A low power consumption reference circuit according to claim 1, characterized in that: A capacitor C2 is electrically connected between the fifth pin and the fourth pin of the DC-DC module chip, and a capacitor C3 is electrically connected between the third pin and the fourth pin of the DC-DC module chip.

6. A low power consumption reference circuit according to claim 5, characterized in that: The second pin and the third pin of the operational amplifier uA741 are electrically connected to a resistor R1 and a resistor R2 respectively.

7. A low power consumption reference circuit according to claim 6, characterized in that: One side of the capacitor C3 is electrically connected to a resistor R3 , one end of the resistor R3 is electrically connected to the third pin of the operational amplifier uA741 , and is electrically connected to one side of the resistor R2 .

8. A low power consumption reference circuit according to claim 1, characterized in that: The sixth pin of the operational amplifier uA741 is electrically connected to an output terminal, and a resistor is electrically connected between the sixth pin and the second pin of the operational amplifier uA741.

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