# US 2013/0154722 A1 · Voltage-stabilizing circuit

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- Number: US 2013/0154722 A1
- Document ID: US20130154722A1
- Status: Published application
- Kind: A1
- Application number: 13/457,940
- Filed: 2012-04-27
- Published: 2013-06-20
- Earliest claimed: 2011-12-19
- Assignees: Hon Hai Precision Industry Co., Ltd.; HONG FU JIN PRECISION INDUSTRY (ShenZhen) CO., LTD.
- Inventors: HAI-QING ZHOU
- Web page: https://patentgrep.com/patent/US20130154722A1

## CPC

- H03K 5/2481: {with at least one differential stage}
- H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M)

## Abstract

A voltage-stabilizing circuit includes a comparator and an RC circuit. A positive input of the comparator receives an enable signal. A negative input of the comparator receives a reference voltage. The RC circuit includes a first resistor and a capacitor. A first terminal of the capacitor is connected to an output of the comparator, a second terminal of the capacitor is grounded through a first resistor, and the first terminal of the capacitor is further connected to an enable pin of a power integrated circuit.

## Claims

### Claim 1

A voltage-stabilizing circuit comprising:
a comparator comprising a positive input receiving an enable signal and a negative input received a reference voltage; and
a RC circuit comprising a first resistor and a capacitor, wherein a first terminal of the capacitor is connected to an output of the comparator, a second terminal of the capacitor is grounded through the first resistor, the first terminal of the capacitor is further connected to an enable pin of a power integrated circuit (IC).

### Claim 2 (depends on 1)

The voltage-stabilizing circuit of claim 1, wherein the reference voltage is provided by a voltage divider circuit, the voltage divider circuit comprises a second resistor, a third resistor, and a power supply, the power supply is grounded through the second resistor and the third resistor connected in series, a node between the second resistor and the third resistor is connected to the negative input of the comparator.

### Claim 3 (depends on 1)

The voltage-stabilizing circuit of claim 1, further comprising a Schmitt trigger connected between the first terminal of the capacitor and the enable pin of the power IC.

### Claim 4 (depends on 1)

The voltage-stabilizing circuit of claim 1, wherein a delay time of the RC circuit is set to be equal to a period when the enable signal is not stable.