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A working sequence control circuit in a two-stage conversion circuit and its method

A technology of converting circuit and working sequence, applied in the field of power supply, to achieve the effect of low cost

Active Publication Date: 2022-06-07
GUOCHUANG INNOVATION CENTER OF MOBILE ENERGY (JIANGSU) CO.,LTD.
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a working sequence control circuit and its method in a two-stage conversion circuit, which solves the technical problem of determining whether the DC-DC circuit starts to work normally by collecting and comparing the bus voltage

Method used

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  • A working sequence control circuit in a two-stage conversion circuit and its method
  • A working sequence control circuit in a two-stage conversion circuit and its method
  • A working sequence control circuit in a two-stage conversion circuit and its method

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Experimental program
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Effect test

Embodiment 1

[0041] like Figure 1-Figure 2 The shown working sequence control circuit in a two-stage conversion circuit includes a power supply unit, a voltage detection unit, a sequence control unit, a voltage hysteresis unit and a signal connection and soft start unit;

[0042] The timing control unit is respectively connected with the power supply unit, the voltage detection unit, the voltage hysteresis unit and the signal connection and soft start unit;

[0043] The voltage detection unit samples the voltage of the measured bus;

[0044] The timing control unit is used for generating the timing signal, and the signal connection and the soft start unit output the control voltage Vout through the timing signal;

[0045] The voltage hysteresis unit is used to set the working hysteresis voltage of the measured voltage.

[0046] Preferably, the timing control unit includes a zener diode ZD2 and a capacitor C2, the power supply unit includes a diode D1, a resistor R5 and a resistor R4, th...

Embodiment 2

[0058] The working sequence control method in a two-stage conversion circuit described in Embodiment 2 is implemented on the basis of the working sequence control circuit in a two-stage conversion circuit described in Embodiment 1, and specifically includes the following steps:

[0059] Step 1: establish a working sequence control circuit in the two-stage conversion circuit, the control voltage Vout is connected to the control circuit enable pin of the latter stage circuit, and the input voltage of the control circuit enable pin of the latter stage circuit is high level to start , low level does not start;

[0060] Step 2: When the external power supply Vin is powered on, the external power supply Vin supplies power to the capacitor C2 of the power supply Vcc node through the diode D1 and the resistor R5, and the power supply VCC rapidly rises to the power supply voltage;

[0061] Step 3: At this time, due to the start-up delay of the front-stage PFC circuit on the tested bus ...

Embodiment 3

[0075] The difference between Embodiment 3 and Embodiment 1 is that the controllable voltage regulator source Q1 is replaced with a transistor Q1, and a voltage regulator diode D3 is added after the resistor R1, as shown in the figure. image 3 As shown, the cathode of the Zener diode D3 is connected to the voltage Vbus through the resistor R1, the anode is connected to the base of the transistor Q1, the resistor R2 is connected between the base and the emitter of the transistor Q1, the emitter of the transistor Q1 is connected to the ground wire, and the capacitor C1 In parallel with the resistor R2, the collector of the transistor Q1 is connected to the negative electrode of the Zener diode ZD1, one end of the resistor R3 is connected to the base of the transistor Q1, and the other end is connected to the collector of the transistor Q2.

[0076] In Embodiment 3, the transistor Q1 replaces the controllable voltage regulator source Q1, and its principle is:

[0077] Step S1: w...

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Abstract

The invention discloses a working sequence control circuit in a two-stage conversion circuit and a method thereof, belonging to the technical field of power supplies, comprising a power supply unit, a voltage detection unit, a sequence control unit, a voltage hysteresis unit, a signal connection and a soft start unit, and solving To solve the technical problem of determining whether the DC-DC circuit starts to work normally by collecting and comparing the bus voltage, the circuit of the present invention can be connected with the control unit of the front and rear stages to realize the change and demand of the actual function, and the circuit adopts low voltage and small current device, low cost.

Description

technical field [0001] The invention belongs to the technical field of power supply, and relates to a working sequence control circuit in a two-stage conversion circuit and a method thereof. Background technique [0002] In the AC-DC two-stage conversion circuit, the pre-stage adopts a PFC circuit, such as a non-isolated BOOST circuit to obtain the bus voltage; the bus voltage is connected to the downstream DC-DC conversion circuit, such as the output of the conventional flyback circuit, and the power supply for the system. Auxiliary power circuit. When the input voltage of the DC-DC circuit is too low, the start-up capability of the DC-DC circuit becomes poor, the start-up inrush current becomes larger, the bus voltage overshoot and undershoot increase, and the stable operation becomes difficult, and the optimization of the transformer design becomes more difficult. Therefore, the use of a DC-DC circuit with a wide range of work will not be conducive to the improvement of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/36
CPCH02M1/36Y02B70/10
Inventor 谢团结裴玉兵
Owner GUOCHUANG INNOVATION CENTER OF MOBILE ENERGY (JIANGSU) CO.,LTD.