A self-starting circuit and starting method

A starting circuit and self-starting technology, which is applied in the direction of adjusting electrical variables, instruments, control/regulation systems, etc., can solve problems such as exceeding the safe working voltage range of low-voltage devices, and achieve the effect of consuming power consumption and ensuring life

CN108227802BActive Publication Date: 2020-01-31CHINA ACAD OF TELECOMM TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-01-31

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    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
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Abstract

The embodiment of the invention provides an automatic starting circuit and a starting method thereof. The automatic starting circuit comprises a starting circuit, a low-voltage-drop linear regulator,a band-gap reference circuit and a logic module, the starting circuit controls the low-voltage-drop linear regulator to generate output voltage VDD_L to the band-gap reference circuit, the band-gap reference circuit generates reference voltage Vref needed by the low-voltage-drop linear regulator according to the output voltage VDD_L, when the output voltage VDD_L reaches a turnover threshold valueof the logic module, the logic module is converted into the second working state reverse to the first working state from the first working state, and controls the starting circuit to be closed, and the low-voltage-drop linear regulator and the band-gap reference circuit have the stable output voltage VDD_L and reference voltage Vref.
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Description

technical field

[0001] The invention relates to the technical field of circuit devices, in particular to a self-starting circuit and a starting method. Background technique

[0002] Such as figure 1 As shown, for example, the 0.13μm process is adopted, the voltage of VDD_H (power supply voltage) is 3.3V, the voltage of VDD_L (output voltage) is 1.5V, and the LDO (low dropout linear regulator) adopts a high-voltage device design, and the bandgap circuit (with Gap reference circuit) adopts low-voltage device design, then in this system, the LDO and the bandgap circuit have a related dependency relationship. The power supply voltage of the bandgap circuit depends on the output voltage of the LDO, and at the same time, the LDO depends on the bandgap circuit to provide the reference voltage. There must be a startup circuit between the two to get rid of the zero merger point.

[0003] traditional approach such as figure 1 As shown, during the power-on process of the system, the...

Examples

Embodiment 1

[0042] see image 3 , the embodiment of the present invention provides a self-starting circuit, including: a starting circuit 31, a low-dropout linear regulator (LDO) 32, a bandgap reference circuit (bandgap) 33 and a logic module 34, wherein the starting circuit 31 controls The low-dropout linear regulator 32 generates the output voltage VDD_L to the bandgap reference circuit 33, and the bandgap reference circuit 33 generates the reference voltage V required by the low-dropout linear regulator 32 according to the output voltage VDD_L ref , when the output voltage VDD_L reaches the inversion threshold of the logic module 34, the logic module 34 changes from the first working state to the opposite second working state, and controls the start-up circuit 31 to turn off, so that the low-dropout linear regulator 32 has a stable output voltage VDD_L and a bandgap reference circuit 33 has a stable reference voltage V ref .

[0043] The above-mentioned flipping threshold can also be...

Embodiment 2

[0050] see Image 6 , the figure shows a starting method for a self-starting circuit, the self-starting circuit includes: a starting circuit, a low dropout linear regulator, a bandgap reference circuit and a logic module, and the starting method includes:

[0051] Step 601, the startup circuit controls the low dropout linear regulator to generate an output voltage VDD_L to the bandgap reference circuit;

[0052] Specifically, the start-up circuit generates a start-up voltage and a start-up current for use by the low-dropout linear regulator, so that the low-dropout linear regulator generates an output voltage VDD_L for the control of the bandgap reference circuit.

[0053] Step 602, the bandgap reference circuit generates the reference voltage V required by the low dropout linear regulator according to the output voltage VDD_L ref ;

[0054] Step 603, when the output voltage VDD_L reaches the inversion threshold of the logic module, the startup circuit is turned off by the l...