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Switch power supply output voltage sampling circuit

A sampling circuit and output voltage technology, applied in the direction of measuring current/voltage, measuring electrical variables, measuring devices, etc., can solve problems such as difficult output voltage control, AC ripple signal is not, loss of AC ripple component of power output voltage, etc. Achieve the effects of output ripple voltage suppression, accurate voltage sampling, and simple circuit

Inactive Publication Date: 2015-10-21
NO 8357 RES INST OF THE THIRD ACADEMY OF CHINA AEROSPACE SCI & IND
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Problems solved by technology

The commonly used switching power supply output voltage sampling circuit, in order to suppress the interference of voltage spikes, performs resistance-capacitance filtering on the sampling circuit, and obtains the average value of the output voltage after filtering for sampling. The signal obtained by using this sampling method loses the output voltage of the power supply. The AC ripple component superimposed on it cannot faithfully reflect the true value of the output voltage, and the voltage regulation loop loses its ability to suppress the ripple voltage.
[0003] The publication number is CN104485816A Chinese patent literature discloses an interleaved parallel switching power supply and its control method, and proposes to generate an AC ripple signal according to the switch control signal of a multi-channel power stage circuit, and then combine the AC ripple signal with the output voltage feedback signal Superimposed control method, but the AC ripple signal is not the ripple voltage signal on the real output voltage, it is difficult to precisely control the output voltage

Method used

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  • Switch power supply output voltage sampling circuit

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Embodiment Construction

[0014] In order to make the purpose, content, and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0015] Such as figure 1 As shown, the present invention provides a switching power supply output voltage sampling circuit, including: a double operational amplifier N1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C1, and a capacitor C2. Amplifier, two capacitors, six resistors, one end of the resistor R1 is connected to the sampled voltage VIN, the other end of the resistor R1 is connected to the same input pin INA+ of the first operational amplifier in the dual operational amplifier N1, and the other end of the resistor R1 Connect one end of the resistor R2 at the same time, the other end of the resistor R2 is grounded, and the capacitor C1 is connected in para...

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Abstract

The invention relates to a switch power supply output voltage sampling circuit, belonging to the signal collection circuit technology field. The switch power supply output voltage sampling circuit adopts the ripple voltage sampling technology, and superposes an output voltage ripple component on a sampling signal while guaranteeing that the switch power supply output voltage average value sampling circuit is stable and reliable. As a result, the sampling signal which is finally obtained can faithfully reflect the switch power supply output voltage, and the voltage regulation loop circuit provided to the switch power supply can perform effective inhibition on the output ripple voltage of the power supply. The switch power supply output voltage sampling circuit is less in the members, simple in the circuit and precise in voltage sampling.

Description

technical field [0001] The invention relates to the technical field of signal acquisition circuits, in particular to an output voltage sampling circuit of a switching power supply. Background technique [0002] The voltage regulation loop of the switching power supply needs to accurately sample the output voltage of the switching power supply to realize the regulated output of the power supply itself. The commonly used switching power supply output voltage sampling circuit, in order to suppress the interference of voltage spikes, performs resistance-capacitance filtering on the sampling circuit, and obtains the average value of the output voltage after filtering for sampling. The signal obtained by using this sampling method loses the output voltage of the power supply. The AC ripple component superimposed on it cannot faithfully reflect the true value of the output voltage, and the voltage regulation loop loses its ability to suppress the ripple voltage. [0003] The publi...

Claims

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Application Information

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IPC IPC(8): G01R19/00
Inventor 何晓宇杨印晟胡华柏赵阳刘志虎
Owner NO 8357 RES INST OF THE THIRD ACADEMY OF CHINA AEROSPACE SCI & IND
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