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Isolated primary side voltage sampling circuit and method thereof

A primary side voltage and sampling circuit technology, applied in the electronic field, can solve problems such as different grounds, achieve the effects of reducing design difficulty, simplifying the types of system components, and saving cost and space

Pending Publication Date: 2019-07-05
南京桐润新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an isolated primary side voltage sampling circuit and its method, which solves the technical problem that the primary side has no sampling chip, and the secondary side controls the chip sampling circuit and does not share the same ground.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0027] Such as figure 1 An isolated primary-side voltage sampling circuit shown includes a transformer T1, a primary-side circuit, a secondary-side main output circuit, and a voltage sampling circuit;

[0028] The transformer T1 includes the primary coil Np, the first secondary coil Ns1 and the second secondary coil Ns, the two ends of the primary coil Np are pin 1 and pin 2 of the transformer T1, and the two ends of the first secondary coil Ns1 are the transformer The 3 pins and 4 pins of T1, the two ends of the second secondary coil Ns are the 4 pins and 5 pins of the transformer T1;

[0029] The primary side circuit includes field effect transistor Q1 and capacitor C5. The S pole of field effect transistor Q1 is connected to the ground wire AGND of the external switching power supply, the D pole is connected to the 2 pin of the transformer T1, and the 1 pin of the transformer T1 is connected to the positive voltage output by the external switching power supply. Vin, the G ...

Embodiment 2

[0034] The isolated primary-side voltage sampling method described in Embodiment 2 is realized by the isolated primary-side voltage sampling circuit shown in Embodiment 1, including the following steps:

[0035] Step 1: Establish an isolated primary side voltage sampling circuit, and connect the sampling output terminal Vin_adc to the AD input terminal of the external controller;

[0036] Step 2: Set the capacitance value of the capacitor C1 to C 1 , Capacitance value of capacitor C2 is C 2 , The resistance of resistor R1 is R 1 , The resistance of resistor R2 is R 2 , The resistance of resistor R3 is R 3 and the resistance of resistor R4 is R 4 , then C 1 、C 2 , R 1 , R2 , R 3 and R 4 The relationship between them is as follows: C 1 2 , R 1 1 =R 1 ×C 1 , τ c =R 1 ×C 2 , τ d =[(R3+R4)×R2)÷(R3+R4+R2)]×C 2 ; τ 1 is the RC time constant, τ d is the discharge time constant, τ c is the charging time constant τ c , τ c d ;

[0037] Step 3: Set the voltage on ...

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Abstract

The invention discloses an isolated primary side voltage sampling circuit and a method thereof, and belongs to the technical field of electronics. The circuit comprises a transformer T1, a primary side circuit, a secondary side main output circuit and a voltage sampling circuit. The isolated primary side voltage sampling circuit and method thereof solve the technical problem that the original sidehas no sampling chip and the secondary side is used to control the chip sampling circuit with no common-ground, and reduces the design difficulty, improves the power density of the power supply and reduces the cost by calculating the input voltage by collecting the secondary voltage of the transformer.

Description

technical field [0001] The invention belongs to the field of electronic technology, in particular to an isolated primary side voltage sampling circuit and a method thereof. Background technique [0002] With the rapid development of switching power supply technology, the requirements for switching power supply are getting higher and higher. Most isolated switching power supplies put the main control chip on the secondary side of the power supply, and the control circuit needs to detect the voltage of the primary side. At present, the more common way to detect the input voltage of the primary side is to add a sampling microcontroller to the primary side and then transmit the voltage value of the primary side to the secondary side through the isolation unit. However, because it involves the power supply of the primary single-chip microcomputer, the isolation unit, etc., it not only increases the cost but also increases the design difficulty. [0003] In order to realize the ...

Claims

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Application Information

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IPC IPC(8): G01R31/40G01R19/00
CPCG01R31/40G01R19/0084
Inventor 伍俊明陈歌滕之伟
Owner 南京桐润新能源有限公司
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