CN101667748B - Circuit power fail safeguard device and protection method thereof - Google Patents
Circuit power fail safeguard device and protection method thereof Download PDFInfo
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Abstract
The invention discloses a circuit power fail safeguard device and a protection method thereof. The device comprises a power fail detection circuit, a charging circuit and a discharging circuit, wherein the power fail detection circuit is connected with a circuit to be detected and is used for detecting whether the circuit to be detected has the phenomenon of power failure; the charging circuit is connected with the power fail detection circuit and is used for storing electrical energy; and the discharging circuit is respectively connected with the charging circuit and the circuit to be detected and is used for supplying power for the circuit to be detected when the circuit to be detected has the phenomenon of power failure. The invention overcomes the defects of high cost and short service life caused by using a stand-by battery, and simultaneously expands the protection range and increases the protection for cache data and register data of a memory controller, thus being capable of supplying power for an internal memory and an internal memory controller under the condition that equipment suddenly have power down phenomenon, and ensuring the equipment to completely store the processed data and the related status messages. In addition, the invention also has the advantages of simple circuit, low cost, short charging time, high efficiency, small volume and long service life.
Description
Technical field
The present invention relates to circuit field, particularly relate to a kind of circuit power fail safeguard device and guard method.
Background technology
Along with the fast development of electron trade, the use of memory device is more and more extensive.The in use read-write of its data is normally carried out in the mode of file, rather than directly memory unit address is operated.When the power down of burst, if be not effectively protected, the data in the transmission course will forever be lost, and device security is caused destructive disaster.Therefore, present most of memory device all can increase in circuit design the power-down protection circuit of Redundancy Design.
Power down protection is a large amount of technology that adopt in the present highly reliable system, when the electric power system powered-off fault, the data in the internal memory and information is played the protective effect of certain hour, has avoided losing of data and information.Existing power-down protection circuit adopts in support power supply of rechargeable battery.Implementation method when working in system, effectively charges for BBU (Backup Battery Unit, battery backup unit) as shown in Figure 1.When the unexpected power down of main power source of internal memory and Memory Controller Hub power supply, enter self-refresh mode by relevant power-fail detection circuit by internal memory, this moment by BBU to the internal memory continued power.This BBU be depend on the time of internal memory continued power battery capacity and in have operating current under the self-refresh mode.
There are following three problems at least in above-mentioned prior art:
The first, for the larger internal memory of memory capacity, its self-refresh mode operating current is larger, causes the power consumption stored among the BBU very fast.In order to satisfy enough guard times, need constantly to expand the capacity of BBU.
The shortcomings such as the second, charging circuit is complicated, cost is high, charging rate is slow, efficient is low, volume is large, the reserve battery life-span is short.
Three, because behind the system power failure, BBU is only to the internal memory continued power, so the method can only protect the data in the internal memory, can't effectively protect the information of the data in the buffer memory in the Memory Controller Hub or configuration register.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of circuit power fail safeguard device and guard method, and power-down protection circuit of the prior art is complicated in order to solve, inefficient problem.
For solving the problems of the technologies described above, on the one hand, the invention provides a kind of circuit power fail safeguard device, described device comprises:
Power-fail detection circuit is connected with circuit to be detected, for detection of the whether power down of described circuit to be detected;
Charging circuit is connected with described power-fail detection circuit, is used for storage of electrical energy;
Discharge circuit, respectively with described charging circuit be connected circuit and be connected, be used for when described circuit power down to be detected, to described circuit supply to be detected.
Further, described discharge circuit comprises: power processor, the power pin of described power processor are in series with inductance L 1 and capacitor C 1 successively.
Further, be provided with diode VD1 between described inductance L 1 and the capacitor C 1.
Further, described inductance L 1 is connected with diode VD2 away from an end of described power processor, and the other end of described diode VD2 is connected with described circuit to be detected.
Further, after capacitor C 6, the C7 parallel connection, an end is connected other end ground connection with described diode VD2 away from an end of inductance L 1.
Further, after capacitor C 3, the C4 parallel connection, an end is connected other end ground connection with the end of described capacitor C 1 away from inductance L 1.
Further, described device also comprises charge switch circuit, and described charge switch circuit is specially:
One end of resistance R 1 is connected with the collector electrode of triode, the other end respectively with resistance R 2 be connected the base stage of triode and be connected, the other end of described resistance R 2 is connected with pulse-width modulator spare, the emitter of described triode is connected with described power processor.
Further, described power-fail detection circuit comprises: the detection of power loss processor, and the input of described detection of power loss processor is connected with described circuit to be detected, and output is connected with the collector electrode of described triode.
Further, the input of described detection of power loss processor is connected with described testing circuit by resistance R 8, and output is connected with the collector electrode of described triode by diode VD3.
On the other hand, the present invention also provides a kind of circuit power fail safeguard method, said method comprising the steps of:
S101, whether judgement charges effective to charging circuit, if effectively, then described charging circuit is charged; If invalid, then charge switch circuit is resetted;
S102 judges whether the charging voltage of described charging circuit reaches setting threshold, if so, then turns S103, if not, then continues described charging circuit is charged;
S103 detects circuit to be detected, when judging circuit power down to be detected, judges further whether the discharge circuit discharge is effective, if so, then powered by discharge circuit; If not, then discharge enables to reset; When judging that circuit to be detected not during power down, then continues to detect circuit to be detected.
Beneficial effect of the present invention is as follows:
The invention provides a kind of power-off protection method and circuit, solved and used the shortcoming that the reserve battery cost is high, the life-span is short, expanded simultaneously protection range, increase the protection to the data cached and register data of Memory Controller Hub.Charging circuit and discharge circuit realize that at a circuit inductance L 1 has not only realized the charging effect but also realized discharging function.This multiplexing method has dwindled circuit scale, has effectively saved circuit cost, also makes circuit more stable simultaneously.In addition, adopt the pulse current charge of Switching Power Supply mode, can control charging current and charging interval neatly.Efficiency for charge-discharge is high, and energy loss is little, and adjustment method is simple.
Description of drawings
Fig. 1 is the circuit block diagram of power down protection system in the prior art;
Fig. 2 is the structural representation of a kind of circuit power fail safeguard device of the embodiment of the invention;
Fig. 3 is the circuit diagram of a kind of power-fail detection circuit of the embodiment of the invention;
Fig. 4 is a kind of circuit power fail safeguard device of embodiment of the invention circuit theory diagrams of (not comprising power-fail detection circuit);
Fig. 5 is the flow chart of a kind of circuit power fail safeguard method in the embodiment of the invention.
Embodiment
In order to solve complicated, the inefficient problem of power-down protection circuit in the prior art, the invention provides a kind of circuit power fail safeguard device and guard method, below in conjunction with accompanying drawing and embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, does not limit the present invention.
To shown in Figure 4, the embodiment of the invention relates to a kind of circuit power fail safeguard device such as Fig. 2, and this device comprises power-fail detection circuit, is connected with circuit to be detected, for detection of whether power down of circuit to be detected; Charging circuit is connected with power-fail detection circuit, is used for storage of electrical energy; Discharge circuit respectively with charging circuit be connected circuit and be connected, be used for when circuit power down to be detected, treat the testing circuit power supply.
Discharge circuit comprises power processor D2, and the power pin VBATT of power processor D2 is in series with inductance L 1 and capacitor C 1 successively.Be provided with diode VD1 between inductance L 1 and the capacitor C 1, the anode of diode VD1 is connected with capacitor C 1, and negative electrode is connected with inductance L 1.Capacitor C 1 is connected with resistance R 7 away from an end of inductance L 1, and the other end of resistance R 7 detects pin VOLT_DET as energy storage, detects for the charging voltage of periodicity to capacitor C 1.Energy storage detects pin VOLT_DET and is connected with capacitor C 2, and the other end of capacitor C 2 is connected with the end of capacitor C 1 near inductance L 1, and while ground connection.Diode VD1, energy storage inductor L1 and storage capacitor C1 consist of the step-down charge circuit together.In the charging and discharging process, fly-wheel diode VD1 provides enough electric currents for energy storage inductor L1, guarantees the normal operation of charging circuit and discharge circuit.Simultaneously, energy storage detects pin VOLT_DET and periodically the charging voltage of storage capacitor C1 is detected, and makes things convenient for system to judge whether to reach effective discharge condition.
The output pin VOUT of power processor D2 is connected with resistance R 5, and the other end of resistance R 5 is as the output port VOUT of this device.The output pin VOUT of power processor D2 is connected the other end ground connection of capacitor C 5 simultaneously with capacitor C 5.For reducing output ripple, increase filter capacitor C6 and C7 before the output port VOUT of this device.After capacitor C 6, the C7 parallel connection, an end is connected other end ground connection with described diode VD2 away from an end of inductance L 1.In addition, decoupling capacitance C6 one end is connected to the output VOUT of discharge circuit, other end ground connection GND.Decoupling capacitance C6, counnter attack are filled with diode VD2, energy storage inductor L1 and are consisted of together the discharge loop that boosts.
In order to prevent that pulse ripple disturbs in the charging process, be provided with filter capacitor C3 and C4 at storage capacitor C1 front end, after capacitor C 3, the C4 parallel connection, one end is connected with the end of capacitor C 1 away from inductance L 1, other end ground connection, simultaneously, the ungrounded end of rear capacitor C 3 in parallel, C4 is connected with power processor D2.Filter capacitor C3 and C4 have the buffer memory effect to charging simultaneously.
The circuit power fail safeguard device of present embodiment also comprises charge switch circuit; this charge switch circuit physical circuit is: an end of resistance R 1 is connected with the collector electrode of triode VT1; the other end is connected base stage with resistance R 2 respectively and is connected with triode VT1; the other end of resistance R 2 and pulse width modulation (Pulse Width Modulation; PWM) device connects, and the emitter of triode VT1 is connected with power processor.When power-fail detection circuit detects circuit power down to be detected, charging enable pin PWM is initialized as low level, after power input voltage VIN process R1 and the R2 series connection dividing potential drop, triode VT1 base voltage is 3.3V, at this moment, triode VT1 conducting, power supply chip D2 begins to start charging, and the pin VBATT of power processor D2 begins to energy storage inductor L1 and storage capacitor C1 charging.When PWM is set to high level, triode VT1 by, charging circuit quits work.Charging control is the pulse type switch circuit that is enabled to control by the PWM device, by the control charging and discharging circuit energy storage inductor L1 and storage capacitor C1 is carried out the pulse charging discharge.
Power-fail detection circuit comprises detection of power loss processor D1, and the input of detection of power loss processor D1 is connected with circuit to be detected, and output is connected with the collector electrode of triode VT1.In order to prevent power supply ripple Interference Detection pin, be provided with resistance R 8 at the input of detection of power loss processor D1.In addition, instead fill with back power-fail detection circuit in order to prevent charging current, add counnter attack at detection of power loss processor D1 output and fill with diode VD3.Power-fail detection circuit is treated the power down judgement of testing circuit, is to judge by the input voltage that detects power-fail detection circuit, when input voltage is higher than 5V, thinks that then system power supply is normal, does not carry out power down protection.When input voltage is lower than 5V, need to judge whether this input voltage is lower than predefined input voltage threshold values, if not, then thinks the normal fluctuation of circuit voltage to be detected, does not carry out power down protection; If so, then further judge the duration of this input voltage whether greater than original time threshold values of setting, if so, then think circuit power down to be detected, carry out power down protection; If not, then think the voltage instantaneous fluctuation of circuit to be detected, do not carry out power down protection.For example, if the input voltage threshold values that sets in advance is 4.6V, the time threshold values is 2S, then is lower than 4.6V and more than the lasting 2S when input voltage, then thinks circuit power down to be detected.
As shown in Figure 5, the embodiment of the invention also relates to a kind of circuit power fail safeguard method, may further comprise the steps:
S501 normally powers on;
S502 judges whether charging circuit rushes electricity effective, if so, then turns step S504; If not, then turn step S503;
S503 if detect invalidly, resets to charge switch circuit, and it is low level that the initialization charging enables PWM;
S504 starts charging circuit, begins storage capacitor C1 and energy storage inductor L1 charging;
S505, energy storage detects pin VOLT_DET and periodically the charging voltage of storage capacitor C1 is detected.Judge that whether charging voltage reaches the setting threshold values, if it is turns step S506; If not, then turn step S504;
S506 detects the operating state of circuit to be detected.If system normally closes, then turn step S510, if power down then turns step S507, if not power down, then continuation detects the operating state of circuit to be detected.
S507 when detecting system power failure, judges further whether the discharge circuit discharge is effective, if so, then turns step S509; If not, then turn step S508;
S508, discharge enables to reset, and initialization DISCHG_EN is low level;
S509 enables in the effective situation in discharge, and discharge circuit begins to start, and provides stand-by power supply to system, and the system of assurance has the sufficient time to preserve data and the information of transmitting when processing power down.Simultaneously, data and information state can recover after lower subnormal powering on.The periodicity that energy storage detects pin VOLT_DET detects the efficient that has guaranteed charging circuit and discharge circuit, thereby improves the efficient of system;
S510 just directly starts the normal shutdown flow process, until system normally closes.
As can be seen from the above-described embodiment; the invention provides a kind of power-off protection method and circuit; solved and used the shortcoming that the reserve battery cost is high, the life-span is short; expanded simultaneously protection range; increase is to the protection of the data cached and register data of Memory Controller Hub; can continue as the power supply of internal memory and Memory Controller Hub in the situation of the unexpected power down of equipment, assurance equipment can be preserved the data in processing and correlation behavior information complete.Charging circuit and discharge circuit are organically combined, and inductance L 1 has not only realized the charging effect but also has realized discharging function.This multiplexing method has dwindled circuit scale, has effectively saved circuit cost, also makes circuit more stable simultaneously.In addition, adopt the pulse current charge of Switching Power Supply mode, can control charging current and charging interval neatly.Efficiency for charge-discharge is high, and energy loss is little, and adjustment method is simple.Therefore, the present invention has the advantage that circuit is simple, cost is low, the charging interval is short, efficient is high, volume is little, the life-span is long.
Although be the example purpose, the preferred embodiments of the present invention are disclosed, it also is possible those skilled in the art will recognize various improvement, increase and replacement, therefore, scope of the present invention should be not limited to above-described embodiment.
Claims (8)
1. a circuit power fail safeguard device is characterized in that, described device comprises:
Power-fail detection circuit is connected with circuit to be detected, for detection of the whether power down of described circuit to be detected;
Charging circuit is connected with described power-fail detection circuit, is used for storage of electrical energy;
Discharge circuit, respectively with described charging circuit be connected circuit and be connected, be used for when described circuit power down to be detected, to described circuit supply to be detected;
Described discharge circuit comprises:
Power processor, the power pin of described power processor are in series with inductance L 1 and capacitor C 1 successively;
Described device also comprises charge switch circuit, and described charge switch circuit is specially:
One end of resistance R 1 is connected with the collector electrode of triode, the other end respectively with resistance R 2 be connected the base stage of triode and be connected, the other end of described resistance R 2 is connected with pulse-width modulator spare, the emitter of described triode is connected with described power processor.
2. circuit power fail safeguard device as claimed in claim 1 is characterized in that, is provided with diode VD1 between described inductance L 1 and the capacitor C 1.
3. circuit power fail safeguard device as claimed in claim 1 is characterized in that, described inductance L 1 is connected with diode VD2 away from an end of described power processor, and the other end of described diode VD2 is connected with described circuit to be detected.
4. circuit power fail safeguard device as claimed in claim 3 is characterized in that, after capacitor C 6, the C7 parallel connection, an end is connected other end ground connection with described diode VD2 away from an end of inductance L 1.
5. circuit power fail safeguard device as claimed in claim 1 is characterized in that, after capacitor C 3, the C4 parallel connection, an end is connected other end ground connection with the end of described capacitor C 1 away from inductance L 1.
6. circuit power fail safeguard device as claimed in claim 1 is characterized in that, described power-fail detection circuit comprises:
The detection of power loss processor, the input of described detection of power loss processor is connected with described circuit to be detected, and output is connected with the collector electrode of described triode.
7. circuit power fail safeguard device as claimed in claim 6 is characterized in that, the input of described detection of power loss processor is connected with described testing circuit by resistance R 8, and output is connected with the collector electrode of described triode by diode VD3.
8. a method of utilizing each described circuit power fail safeguard device of claim 1～7 to carry out circuit power fail safeguard is characterized in that, said method comprising the steps of:
S101, whether judgement charges effective to charging circuit, if effectively, then described charging circuit is charged; If invalid, then charge switch circuit is resetted;
S102 judges whether the charging voltage of described charging circuit reaches setting threshold, if so, then turns S103, if not, then continues described charging circuit is charged;
S103 detects circuit to be detected, when judging circuit power down to be detected, judges further whether the discharge circuit discharge is effective, if so, then powered by discharge circuit; If not, then discharge enables to reset; When judging that circuit to be detected not during power down, then continues to detect circuit to be detected.
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| CN 200910180334 CN101667748B (en) | 2009-10-26 | 2009-10-26 | Circuit power fail safeguard device and protection method thereof |
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| CN111338456B (en) * | 2020-03-04 | 2021-07-27 | 苏州浪潮智能科技有限公司 | BBU power failure protection implementation method and system |
| CN112165155A (en) * | 2020-08-28 | 2021-01-01 | 珠海格力电器股份有限公司 | Power-down protection device, robot controller and power-down protection method thereof |
| CN112446058B (en) * | 2020-12-16 | 2022-04-29 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Data safety protection device |
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