CN103166297A - Power-fail protection circuit without backup battery - Google Patents
Power-fail protection circuit without backup battery Download PDFInfo
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- CN103166297A CN103166297A CN201310077598XA CN201310077598A CN103166297A CN 103166297 A CN103166297 A CN 103166297A CN 201310077598X A CN201310077598X A CN 201310077598XA CN 201310077598 A CN201310077598 A CN 201310077598A CN 103166297 A CN103166297 A CN 103166297A
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Abstract
The invention relates to a power-fail protection circuit without a backup battery. Most traditional power-fail protection circuits with backup batteries are high in cost and short in service life. The power-fail protection circuit comprises a DC/DC circuit, a three-terminal voltage regulator circuit, a voltage sampling circuit and a diode isolating circuit, the DC/DC circuit comprises a DC/DC chip, a Schottky diode, an inductor, two filter capacitors, a capacitor and three resistors, the three-terminal voltage regulator circuit comprises a three-terminal regulator and three filter capacitors, the voltage sampling circuit comprises two resistors, and the diode isolating circuit comprises three Schottky diodes. The DC/DC circuit supplies power for the three-terminal voltage regulator circuit only in the moment that power fails in a system, and important onsite data in an RAM (random-access memory) and a temporary storage are protected and can be accurately recovered after the system is powered on again, so that the system stably and reliably runs. Compared with a power-fail protection circuit with a backup battery, the power-fail protection circuit without the backup battery is higher in reliability.
Description
Technical field
The invention belongs to electronic technology field, be specifically related to a kind of power-down protection circuit of without male offspring standby battery.
Background technology
Real-time data acquisition take microprocessor as core, processing, control appliance, and intelligent terminal has been widely used in industrial control field.The control system of having relatively high expectations for Information Security like this, usually require the data in related register and memory (inside and outside RAM) never to allow to lose after power supply power-fail, system powers up the operating state before rear requirement can return to power down fully again.
Traditional power-down protection circuit adopts backup battery mostly; after power down, the data protection circuit battery that places one's entire reliance upon continues power supply; until the content backup of related register and memory is complete; because battery is in the charge or discharge state always; generally can only use about 3-5; so need after 3-5 to change battery, the situation of leakage can occur in battery in addition, causes pcb board to be corroded.
At industrial control field, direct current 24V and direct current 5V all adopt the Switching Power Supply power supply at present, so often capacity is less for the output filter capacitor of its inside, after the input power power down, the output voltage of Switching Power Supply can fall very soon.Direct current 24V gives relay, electromagnetically operated valve, the power supply of direct current machine constant power device usually in addition, because the operating current instantaneous variation of these devices is larger, cause the voltage ripple of direct current 24V power supply also larger, thus the general another use one tunnel of microprocessor and peripheral circuit thereof independently the 5V power supply power separately; Before described, because the output capacitance of 5V Switching Power Supply is less, it is to preserve needed hundreds of millisecond delay times of significant data that the energy that stores in the 5V filter capacitor can't provide microprocessing systems, need to be microprocessor and peripheral circuit power supply thereof by the 24V power supply is auxiliary for this reason, thereby extend the power-on time after power down.
Summary of the invention
Purpose of the present invention overcomes the deficiencies in the prior art exactly, and a kind of power-down protection circuit of without male offspring standby battery is provided.
The power-down protection circuit of a kind of without male offspring standby battery of the present invention comprises DC/DC circuit, three-terminal voltage-stabilizing circuit, voltage sampling circuit and diode-isolated circuit.
Described DC/DC circuit comprises DC/DC chip U1 MC33063, the second Schottky diode D2, the first inductance L 1, the first filter capacitor C1, the first matching capacitance C2, the second filter capacitor C3, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3;
the first resistance R 1 one ends, the positive pole of the first filter capacitor C1 is connected with 6 pins of DC/DC chip U1 MC33063, the negative pole of the first filter capacitor C1 is connected to GND, 1 of first resistance R 1 other end and DC/DC chip U1 MC33063, 7, 8 pins connect, 3 pins of DC/DC chip U1 MC33063 are connected with the end of the first matching capacitance C2, 4 pins of the other end of the first matching capacitance C2 and DC/DC chip U1 MC33063, the anode of the second Schottky diode D2, the negative pole of the second filter capacitor C3 connects and meets GND, 2 pins of DC/DC chip U1 MC33063 and the negative electrode of the second Schottky diode D2, one end of the first inductance L 1 connects, the positive pole of the other end of the first inductance L 1 and the second filter capacitor C3, one end of the second resistance R 2 connects, 5 pins of DC/DC chip U1 MC33063 and the other end of the second resistance R 2, one end of the 3rd resistance R 3 connects, the other end of the 3rd resistance R 3 is connected with GND.
Described three-terminal voltage-stabilizing circuit comprises three terminal regulator U2 LM1117, the 3rd filter capacitor C4, the 4th filter capacitor C5 and the 5th filter capacitor C6;
The Vin end of three terminal regulator U2 LM1117 is connected with the positive pole of the 3rd filter capacitor C4, the positive pole of the Vout of three terminal regulator U2 LM1117 end and the 4th filter capacitor C5, the end of the 5th filter capacitor C6 are connected and as the 3.3V voltage output end, and the other end of the GND pin of the negative pole of the 3rd filter capacitor C4 and three terminal regulator U2 LM1117, the negative pole of the 4th filter capacitor C5, the 5th filter capacitor C6, the other end of the 3rd resistance R 3 are connected and meet GND.
Described voltage sampling circuit comprises the 4th resistance R 4 and the 5th resistance R 5;
The positive pole of supply voltage 5V is connected with an end of the 4th resistance R 4, and the other end of the 4th resistance R 4 is connected with an end of the 5th resistance R 5 and meets Udet, another termination GND of the 5th resistance R 5.
Described diode-isolated circuit comprises the first Schottky diode D1, the 3rd Schottky diode D3, the 4th Schottky diode D4;
The anode of the first Schottky diode D1 is connected with the 24V positive source, the negative electrode of the first Schottky diode D1 is connected with the first resistance R 1 one ends, the anode of the 3rd Schottky diode D3 is connected with an end of the first inductance L 1 with the positive pole of the second filter capacitor C3, an end of the second resistance R 2, the negative electrode of the 3rd Schottky diode D3 is connected with the positive pole of the 3rd filter capacitor C4 with the negative electrode of the 4th Schottky diode D4, the Vin end of three terminal regulator U1, and the anode of the 4th Schottky diode D4 is connected with the 5V positive source.
Beneficial effect of the present invention: the protective circuit that this programme adopts; do not need extra powered battery; solved the trouble of frequent replacing battery; and can be after power down; provide extra a period of time to power to microprocessor system; reach the purpose of saving scene significant data, compare with traditional battery, the power down protection time of the present invention is long, reliability is high.
Description of drawings
Fig. 1 is circuit diagram of the present invention.
Embodiment
As shown in Figure 1, the power-down protection circuit of a kind of without male offspring standby battery of the present invention comprises DC/DC circuit, three-terminal voltage-stabilizing circuit, voltage sampling circuit and diode-isolated circuit.
Described DC/DC circuit comprises DC/DC chip U1 MC33063, the second Schottky diode D2, the first inductance L 1, the first filter capacitor C1, the first matching capacitance C2, the second filter capacitor C3, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3;
the first resistance R 1 one ends, the positive pole of the first filter capacitor C1 is connected with 6 pins of DC/DC chip U1 MC33063, the negative pole of the first filter capacitor C1 is connected to GND, 1 of first resistance R 1 other end and DC/DC chip U1 MC33063, 7, 8 pins connect, 3 pins of DC/DC chip U1 MC33063 are connected with the end of the first matching capacitance C2, 4 pins of the other end of the first matching capacitance C2 and DC/DC chip U1 MC33063, the anode of the second Schottky diode D2, the negative pole of the second filter capacitor C3 connects and meets GND, 2 pins of DC/DC chip U1 MC33063 and the negative electrode of the second Schottky diode D2, one end of the first inductance L 1 connects, the positive pole of the other end of the first inductance L 1 and the second filter capacitor C3, one end of the second resistance R 2 connects, 5 pins of DC/DC chip U1 MC33063 and the other end of the second resistance R 2, one end of the 3rd resistance R 3 connects, the other end of the 3rd resistance R 3 is connected with GND.
Described three-terminal voltage-stabilizing circuit comprises three terminal regulator U2 LM1117, the 3rd filter capacitor C4, the 4th filter capacitor C5 and the 5th filter capacitor C6;
The Vin end of three terminal regulator U2 LM1117 is connected with the positive pole of the 3rd filter capacitor C4, the positive pole of the Vout of three terminal regulator U2 LM1117 end and the 4th filter capacitor C5, the end of the 5th filter capacitor C6 are connected and as the 3.3V voltage output end, and the other end of the GND pin of the negative pole of the 3rd filter capacitor C4 and three terminal regulator U2 LM1117, the negative pole of the 4th filter capacitor C5, the 5th filter capacitor C6, the other end of the 3rd resistance R 3 are connected and meet GND.
Described voltage sampling circuit comprises the 4th resistance R 4 and the 5th resistance R 5;
The positive pole of supply voltage 5V is connected with an end of the 4th resistance R 4, and the other end of the 4th resistance R 4 is connected with an end of the 5th resistance R 5 and meets Udet, another termination GND of the 5th resistance R 5.
Described diode-isolated circuit comprises the first Schottky diode D1, the 3rd Schottky diode D3, the 4th Schottky diode D4;
The anode of the first Schottky diode D1 is connected with the 24V positive source, the negative electrode of the first Schottky diode D1 is connected with the first resistance R 1 one ends, the anode of the 3rd Schottky diode D3 is connected with an end of the first inductance L 1 with the positive pole of the second filter capacitor C3, an end of the second resistance R 2, the negative electrode of the 3rd Schottky diode D3 is connected with the positive pole of the 3rd filter capacitor C4 with the negative electrode of the 4th Schottky diode D4, the Vin end of three terminal regulator U1, and the anode of the 4th Schottky diode D4 is connected with the 5V positive source.
To system power supply, when system had just powered on, two-way voltage was inputted simultaneously by Switching Power Supply 24V and 5V in the present invention.5V voltage produces 3.3V voltage through the 4th Schottky diode D4 and three terminal regulator U2, gives microprocessor power supply; 24V voltage produces 4.67V voltage through the first Schottky diode D1 and DC/DC reduction voltage circuit.Wherein, the first resistance R 1 is the current sampling resistor of DC/DC chip U1, plays overcurrent protection; The second capacitor C 2 is frequency electric capacity, the frequency of determine switch power supply; The second Schottky diode D2, the first inductance L 1 and the 3rd filter capacitor C3 are the classical architecture of BUCK circuit; The second resistance R 2 and the 3rd resistance R 3 are output voltage sampling proportion resistor, are input to 5 pins of DC/DC chip U1, control the duty ratio of the 2 pin output waveforms of DC/DC chip U1.Because 4.67V is lower than 5V voltage, so when system works, the 4th Schottky diode D4 conducting, the 3rd Schottky diode D3 cut-off.When system power failure, externally fed power supply 24V and 5V magnitude of voltage reduce rapidly, owing to having added the first Schottky diode D1 and the 4th Schottky diode D4, so the energy in the first capacitor C 1 and the 4th capacitor C 4 can not return to refluence.When 5V voltage input end magnitude of voltage during lower than 4.67V, the 4th Schottky diode D4 cut-off, the 3rd Schottky diode D3 conducting, the DC/DC circuit continues to system power supply (duration 200ms left and right).Be input to the interrupt pin of microprocessor by resistance pressure-dividing network, the instant generation interrupted, and begins to protect the important field data in relevant RAM and register, and after guaranteeing again to power on, significant data can recover fully, thereby realizes the Systems balanth reliability service.Compare with traditional battery, the power down protection time of the present invention is long, reliability is high.
Claims (1)
1. the power-down protection circuit of a without male offspring standby battery, comprise DC/DC circuit, three-terminal voltage-stabilizing circuit, voltage sampling circuit and diode-isolated circuit;
It is characterized in that: described DC/DC circuit comprises DC/DC chip U1 MC33063, the second Schottky diode D2, the first inductance L 1, the first filter capacitor C1, the first matching capacitance C2, the second filter capacitor C3, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3;
the first resistance R 1 one ends, the positive pole of the first filter capacitor C1 is connected with 6 pins of DC/DC chip U1 MC33063, the negative pole of the first filter capacitor C1 is connected to GND, 1 of first resistance R 1 other end and DC/DC chip U1 MC33063, 7, 8 pins connect, 3 pins of DC/DC chip U1 MC33063 are connected with the end of the first matching capacitance C2, 4 pins of the other end of the first matching capacitance C2 and DC/DC chip U1 MC33063, the anode of the second Schottky diode D2, the negative pole of the second filter capacitor C3 connects and meets GND, 2 pins of DC/DC chip U1 MC33063 and the negative electrode of the second Schottky diode D2, one end of the first inductance L 1 connects, the positive pole of the other end of the first inductance L 1 and the second filter capacitor C3, one end of the second resistance R 2 connects, 5 pins of DC/DC chip U1 MC33063 and the other end of the second resistance R 2, one end of the 3rd resistance R 3 connects, the other end of the 3rd resistance R 3 is connected with GND,
Described three-terminal voltage-stabilizing circuit comprises three terminal regulator U2 LM1117, the 3rd filter capacitor C4, the 4th filter capacitor C5 and the 5th filter capacitor C6;
The Vin end of three terminal regulator U2 LM1117 is connected with the positive pole of the 3rd filter capacitor C4, the positive pole of the Vout of three terminal regulator U2 LM1117 end and the 4th filter capacitor C5, the end of the 5th filter capacitor C6 are connected and as the 3.3V voltage output end, and the other end of the GND pin of the negative pole of the 3rd filter capacitor C4 and three terminal regulator U2 LM1117, the negative pole of the 4th filter capacitor C5, the 5th filter capacitor C6, the other end of the 3rd resistance R 3 are connected and meet GND;
Described voltage sampling circuit comprises the 4th resistance R 4 and the 5th resistance R 5;
The positive pole of supply voltage 5V is connected with an end of the 4th resistance R 4, and the other end of the 4th resistance R 4 is connected with an end of the 5th resistance R 5 and meets Udet, another termination GND of the 5th resistance R 5;
Described diode-isolated circuit comprises the first Schottky diode D1, the 3rd Schottky diode D3, the 4th Schottky diode D4;
The anode of the first Schottky diode D1 is connected with the 24V positive source, the negative electrode of the first Schottky diode D1 is connected with the first resistance R 1 one ends, the anode of the 3rd Schottky diode D3 is connected with an end of the first inductance L 1 with the positive pole of the second filter capacitor C3, an end of the second resistance R 2, the negative electrode of the 3rd Schottky diode D3 is connected with the positive pole of the 3rd filter capacitor C4 with the negative electrode of the 4th Schottky diode D4, the Vin end of three terminal regulator U1, and the anode of the 4th Schottky diode D4 is connected with the 5V positive source.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310077598.XA CN103166297B (en) | 2013-03-11 | 2013-03-11 | Power-fail protection circuit without backup battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310077598.XA CN103166297B (en) | 2013-03-11 | 2013-03-11 | Power-fail protection circuit without backup battery |
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| CN103166297A true CN103166297A (en) | 2013-06-19 |
| CN103166297B CN103166297B (en) | 2015-06-17 |
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| CN201310077598.XA Active CN103166297B (en) | 2013-03-11 | 2013-03-11 | Power-fail protection circuit without backup battery |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105630125A (en) * | 2014-10-29 | 2016-06-01 | 中兴通讯股份有限公司 | Data protection method and apparatus as well as power supply module |
| CN105630709A (en) * | 2016-01-27 | 2016-06-01 | 深圳市美贝壳科技有限公司 | Terminal device power failure memory method |
| CN106681239A (en) * | 2017-03-15 | 2017-05-17 | 江苏华康能达电气设备有限公司 | Scanning module |
| CN107843807A (en) * | 2016-09-20 | 2018-03-27 | 丰郅(上海)新能源科技有限公司 | A kind of moment in Voltage Drop can turn off the monitoring system of power network in time |
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| US6108217A (en) * | 1999-10-19 | 2000-08-22 | Ivi Checkmate Ltd. | Backup power circuit |
| CN202206151U (en) * | 2011-08-10 | 2012-04-25 | 安徽省高程电子科技有限公司 | Lithium battery combination power supply system |
| CN202217997U (en) * | 2011-09-06 | 2012-05-09 | 青岛海信电器股份有限公司 | Power-failure protection circuit, power-failure protection device and display device |
| CN203104083U (en) * | 2013-03-11 | 2013-07-31 | 杭州电子科技大学 | Power failure protection circuit |
-
2013
- 2013-03-11 CN CN201310077598.XA patent/CN103166297B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6108217A (en) * | 1999-10-19 | 2000-08-22 | Ivi Checkmate Ltd. | Backup power circuit |
| CN202206151U (en) * | 2011-08-10 | 2012-04-25 | 安徽省高程电子科技有限公司 | Lithium battery combination power supply system |
| CN202217997U (en) * | 2011-09-06 | 2012-05-09 | 青岛海信电器股份有限公司 | Power-failure protection circuit, power-failure protection device and display device |
| CN203104083U (en) * | 2013-03-11 | 2013-07-31 | 杭州电子科技大学 | Power failure protection circuit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105630125A (en) * | 2014-10-29 | 2016-06-01 | 中兴通讯股份有限公司 | Data protection method and apparatus as well as power supply module |
| CN105630709A (en) * | 2016-01-27 | 2016-06-01 | 深圳市美贝壳科技有限公司 | Terminal device power failure memory method |
| CN107843807A (en) * | 2016-09-20 | 2018-03-27 | 丰郅(上海)新能源科技有限公司 | A kind of moment in Voltage Drop can turn off the monitoring system of power network in time |
| CN106681239A (en) * | 2017-03-15 | 2017-05-17 | 江苏华康能达电气设备有限公司 | Scanning module |
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| CN103166297B (en) | 2015-06-17 |
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