Analog voltage subtracter circuit

A technology of simulating voltage and subtractor, applied in the direction of instruments, adjusting electrical variables, control/regulating systems, etc., can solve the problem of loss of amplification function of operational amplifiers, etc., to achieve the effect of good loop stability and easy compensation

Inactive Publication Date: 2021-01-01
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the limitations of the traditional analog voltage subtractor circuit, the present invention provides a novel analog voltage subtractor circuit to solve the problem that the operational amplifier will lose its amplification when the difference between the first input voltage and the second input voltage is relatively large. function problem

Method used

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no. 1 example

[0029] Please refer to Figure 4 , an analog voltage subtractor circuit, comprising a first voltage-to-current circuit connected to a first input voltage V1, a second voltage-to-current circuit connected to a second input voltage V2, a current mirror circuit and an output load circuit. The first input voltage V1 and the second input voltage V2 are voltages connected to the Rcs resistor at one end of the exciting inductance of the switching power supply circuit, and the first voltage V1 is greater than the second input voltage V2.

[0030] The first voltage-to-current circuit is used to convert the first input voltage V1 into the first current I1.

[0031] The first voltage-to-current circuit is composed of a first error amplifier EA1, a first NMOS transistor N1, and a first resistor R1. The first error amplifier EA1 adopts an NMOS transistor-input error amplifier. The positive input terminal of the first error amplifier EA1 is connected to the first resistor R1. An input volt...

no. 2 example

[0041] refer to Figure 5 , an analog voltage subtractor circuit, comprising: a first voltage-to-current circuit, a second voltage-to-current circuit, a current mirror circuit, an output load circuit, an output terminal, and a differential current mirror circuit. The first voltage-to-current circuit, the second voltage-to-current circuit and the current mirror circuit are the same and will not be described here.

[0042] The difference between the second embodiment and the first embodiment is that in the second embodiment, a differential current mirror circuit is added, and the output load circuit and the output terminal are respectively connected to the differential current mirror circuit. The differential current mirror circuit has a first mirror circuit composed of a third NMOS transistor N3 and a fourth NMOS transistor N4, and a second mirror circuit composed of a third PMOS transistor P3 and a fourth PMOS transistor P4. The third NMOS transistor N3 , the fourth NMOS tran...

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Abstract

The invention discloses an analog voltage subtractor circuit. The voltage subtractor circuit comprises a first voltage-to-current circuit, a second voltage-to-current circuit, a current mirror image circuit and an output load circuit. The first voltage-to-current circuit converts a voltage V1 into a current I1, the second voltage-to-current circuit converts a voltage V2 into a current I2, and thecurrent mirror circuit enables a difference current I3 of the current I1 and the current I2 to flow into the output load circuit to generate an output voltage, so that voltage-current-voltage conversion is realized, and subtraction of the voltage V1 and the voltage V2 is completed.

Description

technical field [0001] The invention relates to an analog voltage subtractor circuit, in particular to an analog voltage subtractor circuit used in a switching power supply, which is used to convert the current reflected on the excitation inductor current into a voltage by an external Rcs resistor, then sample and hold it, and then perform Subtraction operation. Background technique [0002] In the switching power supply circuit, it is often necessary to perform a sample-and-hold operation after the current reflected on the exciting inductance is converted into a voltage by an external Rcs resistor. There are peak currents and valley currents in the exciting inductor current, and it is often necessary to subtract the sampled peak voltage and valley voltage. Based on this, the present invention proposes an analog voltage subtractor circuit for switching power supplies. [0003] figure 1 Shown is the switching power supply topology of an asymmetrical half-bridge flyback conv...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G05F3/26
CPCG05F3/26
Inventor马勋白连龙杨文敏
OwnerMORNSUN GUANGZHOU SCI & TECH