Power supply circuit capable of automatically reducing LDO power consumption and signal generator

A technology of power supply circuit and power consumption, applied in the field of power supply, can solve the problem of high power consumption of LDO, and achieve the effect of reducing the use of pins, simplifying the software control process, and reducing the power consumption of LDO

Active Publication Date: 2020-10-16
WUHAN JINGCE ELECTRONICS GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the software adjustment process, the LDO circuit is in a large vo

Method used

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  • Power supply circuit capable of automatically reducing LDO power consumption and signal generator
  • Power supply circuit capable of automatically reducing LDO power consumption and signal generator
  • Power supply circuit capable of automatically reducing LDO power consumption and signal generator

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0068] Example 1

[0069] In this embodiment, an inversion circuit is added to the VDAC in the control circuit of the DCDC, Figure 5 This is a schematic structural diagram of the power supply circuit for automatically reducing the power consumption of the LDO provided by this embodiment. In order to ensure that the gain of the DCDC and the LDO to the VDAC variable remains the same, and the offset has a fixed difference, this embodiment introduces the DCDC control circuit. Negative magnification and bias voltage. see Figure 5 , the first voltage control network in the power supply circuit includes a first inversion circuit and a first matching circuit;

[0070] The first inversion circuit includes an operational amplifier AMP1, the inverting input terminal of the operational amplifier AMP1 is connected to the output terminal of the DAC to receive the analog voltage VDAC output by the DAC, the non-inverting input terminal receives the input voltage Vb, and the output termina...

Example Embodiment

[0079] Embodiment 2

[0080] In this embodiment, an inversion circuit is added to the VDAC in the control circuit of the LDO, Figure 5 This is a schematic diagram of the structure of the power supply circuit for automatically reducing the power consumption of the LDO provided by this embodiment. In order to ensure that the gain of the DCDC and the LDO to the VDAC variable remains the same, and the offset has a fixed difference, this embodiment introduces the control circuit of the LDO. Negative magnification and bias voltage. see Image 6 , the first voltage control network in the power supply circuit includes a third matching circuit;

[0081] The first end of the third matching circuit is connected to the output end of the DAC to receive the analog voltage VDAC, the second end is connected to the input end of the DCDC converter, the third end is grounded, and the fourth end is connected to the output end of the DCDC converter; DCDC conversion The output end of the regula...

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Abstract

The invention discloses a power supply circuit capable of automatically reducing LDO power consumption and a signal generator, and the circuit comprises: a control unit which is used for respectivelyproviding the generated same analog voltage for a first voltage control network and a second voltage control network; a first voltage control network which is used for cooperating with the DCDC to execute linear scaling processing with a first scaling coefficient on the analog voltage to generate a first output voltage; and a second voltage control network which is used for cooperating with the LDO to execute linear scaling processing with a second scaling coefficient on the analog voltage to generate a second output voltage, wherein the first scaling coefficient and the second scaling coefficient are configured to be equal so as to achieve gain elimination of the first output voltage and the second output voltage on the analog voltage, and the difference value between the first output voltage and the second output voltage is not larger than a preset voltage difference threshold value, the control signals output by the DCDC and the LDO are associated to the same controller, gain elimination of the output of the DCDC and the LDO to the control signals is achieved through configuration, it is ensured that a fixed low-voltage difference value exists between the input voltage and the output voltage of the LDO, and therefore the power consumption of the LDO is effectively reduced.

Description

technical field [0001] The invention belongs to the field of power supply technology, and more specifically relates to a power supply circuit and a signal generator for automatically reducing power consumption of an LDO. Background technique [0002] In electronic systems, the ripple and power consumption of the power supply are the key points that need to be paid attention to in the design. Precision equipment, such as power supplies used in signal generators, need to have the characteristics of low noise and small ripple. Low dropout regulators (low dropout regulators, LDOs) are undoubtedly one of the most suitable power supplies at present. In the traditional power supply structure, the input voltage of the LDO remains unchanged. For the drive circuit that needs to output an adjustable voltage range, when a lower output voltage is required, the LDO will bear a large voltage difference, causing the circuit power consumption and heat to increase sharply. rise, thereby affe...

Claims

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Application Information

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IPC IPC(8): H02M3/157
CPCH02M3/157H02M1/0048Y02B70/10
Inventor 杨上
Owner WUHAN JINGCE ELECTRONICS GRP CO LTD
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