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Voltage zero-crossing detecting circuit and DC-DC converter with same

A detection circuit and voltage zero-crossing technology, applied in the direction of output power conversion devices, measuring current/voltage, instruments, etc., can solve the problems of difficult integration, large volume, expensive, etc., and achieve improved conversion efficiency, simple circuit structure, and energy saving area effect

Active Publication Date: 2011-07-20
ARKMICRO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it is complex, expensive, bulky, and difficult to integrate

Method used

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  • Voltage zero-crossing detecting circuit and DC-DC converter with same
  • Voltage zero-crossing detecting circuit and DC-DC converter with same
  • Voltage zero-crossing detecting circuit and DC-DC converter with same

Examples

Experimental program
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Effect test

Embodiment 1

[0028] In the first embodiment, the voltage zero-crossing detection circuit adopts such as image 3 Described circuit structure, this structure comprises PMOS tube m 1 、m 2 、m 3 、m 4 , NMOS tube m 5 、m 6 、m 7 , switch tube m s0 、m s1 , inverter inv, current source I 0 and resistance R 0 , supply voltage V DD , the following combination as figure 1 The shown DC-DC converter illustrates the connection relationship of the voltage zero-crossing detection circuit described in this embodiment and the working principle applied to the DC-DC converter: wherein, the current source I 0 As a reference current source, it provides bias current to the amplifier, when V ckn When it is at a high level, the synchronous rectifier mn is turned on, and the inductance L is freewheeling, and the freewheeling direction is from the ground to the drain SW of the rectifier mn, and the voltage at the drain SW is input to the PMOS transistor m 3 、m 4 and NMOS tube m 6 、m 7 Composed of ampl...

Embodiment 2

[0043] Such as Figure 5 Shown is another voltage zero-crossing detection circuit of the present invention, the circuit structure is as follows image 3 On the basis of the voltage zero-crossing detection circuit shown, 5 PMOS transistors are added 8 、m 9 、m 10 、m 11 、m 12 and a reference current source I 0 , where the PMOS tube m 8 , PMOS tube m 9 , PMOS tube m 10 , PMOS tube m 11 Mirror connection, and in series with the PMOS transistor m 1 , PMOS tube m 2 , PMOS tube m 3 , PMOS tube m 4 source and supply V DD between, forming a folded current source structure; PMOS tube m 12 and reference current source I 0 in series with the power supply V DD and ground, and the PMOS tube m 12 The gate drain is connected to the PMOS tube m 1 、m 2 、m 3 、m 4 Provide bias voltage to ensure that the four PMOS tubes are in a deep saturation state; PMOS tube m 8 The gate and PMOS tube m 1 The drain is connected to the mirrored PMOS transistor m 8 、m 9 、m 10 、m 11 Provi...

Embodiment 3

[0046] Such as Image 6 Shown is another voltage zero-crossing detection circuit of the present invention, which removes the second-stage amplifier on the basis of the voltage zero-crossing detection circuit described in Embodiment 1, that is, removes the PMOS tube m 4 and NMOS tube m 7 , directly from the output terminal V of the first-stage amplifier 1 As V in Example 1 cn Output to the feedback control loop. The working principle of this circuit for detecting zero-crossing voltage is the same as that of the circuit shown in Embodiment 1. The gain of the one-stage amplifier is smaller than that of the two-stage amplifier, but the circuit structure is simple and the chip area is saved.

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PUM

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Abstract

The invention discloses a voltage zero-crossing detecting circuit. The circuit comprises PMOS (P-channel Metal Oxide Semiconductor) transistors m1, m2 and m3, NMOS (N-channel Metal Oxide Semiconductor) transistors m5, m6, Ms0 and Ms1, a reference current source I0, a resistor R0 and a phase inverter. The voltage zero-crossing detecting circuit can also comprise a serial connection branch circuit which comprises a PMOS transistor m4 and an NMOS transistor m7. The invention also discloses a DC-DC converter with the voltage zero-crossing detecting circuit, which comprises a power transistor mp, a synchronous rectifying transistor mn, an inductor L, a capacitor Cout, a power supply voltage and a feedback control loop. The invention balances the time delay of logic units, such as the feedback control loop, and the like by a simple circuit, saves the cost, improves the reliability and is suitable for the application of a portable product.

Description

technical field [0001] The invention relates to an analog integrated circuit, in particular to an analog integrated circuit capable of detecting the zero-crossing point of current or voltage of a circuit and its application. Background technique [0002] Synchronous rectification is a technology that uses power MOSFETs with very low on-state resistance to replace rectifier diodes to reduce rectification losses, and can greatly improve the conversion efficiency of the converter. Synchronous rectification DC-DC converter is a commonly used power supply IC, which has the advantages of large output current and high conversion efficiency, and is one of the preferred power supply systems for portable products. [0003] In discontinuous mode (DCM), when the synchronous rectifier is turned on, the inductor current decreases linearly at this time. When the current drops to zero, if the synchronous rectifier is still on, the output capacitor may flow the current back through the synch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/175H02M3/155
Inventor 吴玉强刘俊秀刘竹石岭
Owner ARKMICRO TECH
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