CN202975966U - Circuit capable of preventing power up failure - Google Patents
Circuit capable of preventing power up failure Download PDFInfo
- Publication number
- CN202975966U CN202975966U CN 201220746571 CN201220746571U CN202975966U CN 202975966 U CN202975966 U CN 202975966U CN 201220746571 CN201220746571 CN 201220746571 CN 201220746571 U CN201220746571 U CN 201220746571U CN 202975966 U CN202975966 U CN 202975966U
- Authority
- CN
- China
- Prior art keywords
- chip
- power supply
- schottky diode
- voltage
- resets
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
A circuit capable of preventing power up failure comprises a voltage select module, a backup power, a power integrated circuit (IC) chip and a reset IC chip with a preset threshold voltage, wherein the voltage select module comprises a first Schottky diode and a second Schottky diode; the backup power is connected with a cathode of the first Schottky diode; the cathode of the first Schottky diode is connected with a cathode of the second Schottky diode; a system power is connected with an anode of the second Schottky diode; the cathode of the first Schottky diode is further connected with a voltage input end of the power IC chip and a detecting end of the reset IC chip; and an output end of the reset IC chip is further connected with an enable end of the power IC chip. The circuit capable of preventing power up failure can effectively prevent power up failure of the power IC chip, and is simple in circuit and low in cost.
Description
Technical field
The utility model relates to a kind of anti-inefficacy circuit that powers on.
Background technology
At commercial Application environment such as the industrial computer of complexity, the moment of power supply electrifying, unstable due to the interference of noise and input supply voltage caused power devices power supply IC chip operation unstable, thereby causes and can not power on.The anti-inefficacy circuit that powers on is the effective measures of head it off, and the circuit of the present anti-inefficacy circuit that powers on is complicated, and cost is expensive.
The utility model content
For the deficiencies in the prior art, the purpose of this utility model is intended to provide a kind of simple and low anti-inefficacy circuit that powers on of cost.
For achieving the above object, the utility model adopts following technical scheme:
A kind of anti-inefficacy circuit that powers on, it comprises the IC chip that resets that voltage is selected module, standby power supply, power supply IC chip and is preset with threshold voltage; This voltage selects module to comprise the first schottky diode and the second schottky diode;
Standby power supply connects the negative electrode of the first schottky diode, the negative electrode of the first schottky diode connects the negative electrode of the second schottky diode, one system power supply connects the anode of the second schottky diode, the negative electrode of the first schottky diode also connects the sense terminal of the voltage input end of power supply IC chip and the IC chip that resets, and the output terminal of the IC chip that resets also connects the Enable Pin of power supply IC chip;
The IC chip that resets is used for the input voltage of power supply IC chip is compared with default threshold voltage, at the input voltage of power supply IC chip during less than threshold voltage, the IC chip that resets output one low level signal is to the Enable Pin of power supply IC chip, during greater than threshold voltage, the IC chip that resets output one high level signal is to the Enable Pin of power supply IC chip at the input voltage of power supply IC chip.
The anti-inefficacy circuit that powers on also comprises the first electric capacity and the second electric capacity, and the negative electrode of the first schottky diode is by the first capacity earth, and this second Capacitance parallel connection is in the two ends of the first electric capacity.
The beneficial effects of the utility model are as follows:
Above-mentioned utility model can prevent effectively that power supply IC chip power lost efficacy, and circuit is simple, and cost is low.
Description of drawings
Fig. 1 is the circuit diagram of the better embodiment of the anti-inefficacy circuit that powers on of the utility model.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described further:
See also Fig. 1, the utility model relates to a kind of anti-inefficacy circuit that powers on, its better embodiment comprises voltage selection module 20, standby power supply 10, power supply IC(integrated circuit, integrated circuit) chip 30 and the IC chip 40 that resets that is preset with threshold voltage.This voltage selects module 20 to comprise schottky diode D1 and D2, capacitor C 1 and C2, and wherein, the output voltage of standby power supply 10 is less than the threshold voltage of the IC chip 40 that resets.
For a person skilled in the art, can make other various corresponding changes and distortion according to technical scheme described above and design, and these all changes and the distortion all should belong to the protection domain of the utility model claim within.
Claims (2)
1. the anti-inefficacy circuit that powers on, is characterized in that: the IC chip that resets that it comprises voltage selection module, standby power supply, power supply IC chip and is preset with threshold voltage; This voltage selects module to comprise the first schottky diode and the second schottky diode;
Standby power supply connects the negative electrode of the first schottky diode, the negative electrode of the first schottky diode connects the negative electrode of the second schottky diode, one system power supply connects the anode of the second schottky diode, the negative electrode of the first schottky diode also connects the sense terminal of the voltage input end of power supply IC chip and the IC chip that resets, and the output terminal of the IC chip that resets also connects the Enable Pin of power supply IC chip;
The IC chip that resets is used for the input voltage of power supply IC chip is compared with default threshold voltage, at the input voltage of power supply IC chip during less than threshold voltage, the IC chip that resets output one low level signal is to the Enable Pin of power supply IC chip, during greater than threshold voltage, the IC chip that resets output one high level signal is to the Enable Pin of power supply IC chip at the input voltage of power supply IC chip.
2. the anti-inefficacy circuit that powers on as claimed in claim 1, it is characterized in that: the anti-inefficacy circuit that powers on also comprises the first electric capacity and the second electric capacity, and the negative electrode of the first schottky diode is by the first capacity earth, and this second Capacitance parallel connection is in the two ends of the first electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220746571 CN202975966U (en) | 2012-12-30 | 2012-12-30 | Circuit capable of preventing power up failure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220746571 CN202975966U (en) | 2012-12-30 | 2012-12-30 | Circuit capable of preventing power up failure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202975966U true CN202975966U (en) | 2013-06-05 |
Family
ID=48517018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220746571 Expired - Fee Related CN202975966U (en) | 2012-12-30 | 2012-12-30 | Circuit capable of preventing power up failure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202975966U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107562114A (en) * | 2017-07-31 | 2018-01-09 | 张家港市华为电子有限公司 | A kind of circuit for CAN circuit power supply |
-
2012
- 2012-12-30 CN CN 201220746571 patent/CN202975966U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107562114A (en) * | 2017-07-31 | 2018-01-09 | 张家港市华为电子有限公司 | A kind of circuit for CAN circuit power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130605 Termination date: 20161230 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |