CN212695903U - Quick discharge circuit after power failure - Google Patents
Quick discharge circuit after power failure Download PDFInfo
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- CN212695903U CN212695903U CN202021579269.7U CN202021579269U CN212695903U CN 212695903 U CN212695903 U CN 212695903U CN 202021579269 U CN202021579269 U CN 202021579269U CN 212695903 U CN212695903 U CN 212695903U
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Abstract
A fast discharging circuit after power failure relates to the technical field of embedded power supply. The power supply circuit aims to solve the problems that the existing embedded system power supply discharge circuit is low in discharge speed, high in energy consumption during normal work and easy to cause system faults during repeated electrification. One end of a resistor R2 of the utility model is connected with one end of a resistor R3, the other end of a triode Q2 base electrode is connected with the other end of a resistor R2 and the other end of a resistor R4, the other end of an emitting electrode connecting resistor R3 and a collector electrode are connected with a power ground; the anode of the diode D1 is connected with the power supply access end of the embedded circuit, the cathode is simultaneously connected with one end of the capacitor C1 and one end of the resistor R1, the other end of the capacitor C1 is connected with the power ground, and the collector of the triode Q1 is connected with the other end of the resistor R1, the emitter-collector power ground and one end of the base electrode connecting resistor R4; the voltage detection circuit is used for detecting the voltage of the cathode of the diode D1 and outputting a high level or a low level to the base of the triode Q2 according to the detection result.
Description
Technical Field
The utility model belongs to the technical field of embedded power supply.
Background
With the rapid development of electronic technology, more and more chips can run a system on chip. With the attendant increasing demands on the power supply. In the practical test of a product, after the power supply is powered off, the electric energy remained in the capacitor cannot be released quickly, so that the power supply voltage is reduced slowly, and if the power supply is powered on at the moment, the start-up fault of an embedded system and the like is likely to be caused. Most systems discharge in a mode of connecting a resistor in parallel at the output end of a power supply, and the mode has the advantages of simple structure and high energy consumption in normal work and can cause system faults with certain probability.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a quick discharge circuit behind power outage in order to solve the problem that current embedded system power discharge circuit discharge speed is slow, the normal during operation power consumption is high and easily lead to system's trouble when repeated power-on.
A power outage back quick discharge circuit include: the device comprises a discharge circuit, an energy storage power supply circuit and a voltage detection circuit;
the discharge circuit comprises a resistor R2, a resistor R3 and a triode Q2, wherein one end of the resistor R2 is connected with one end of a resistor R3, the other end of the resistor R2 is connected with the base electrode of the triode Q2, the other end of the resistor R3 is connected with the emitter electrode of the triode Q2, and the collector electrode of the triode Q2 is connected with the power ground;
the energy storage power supply circuit comprises a diode D1, a capacitor C1, a resistor R1, a triode Q1 and a resistor R4, wherein the anode of the diode D1 is connected with the power supply access end and the cathode of the embedded circuit and is simultaneously connected with one end of a capacitor C1 and one end of a resistor R1, the other end of the capacitor C1 is connected with a power ground, the other end of the resistor R1 is connected with the collector of a triode Q1, the emitter of the triode Q1 is connected with the power ground, the base of the triode Q1 is connected with one end of a resistor R4, and the other end of the resistor R4 is connected with the base of the triode Q2;
the voltage detection circuit is used for detecting the voltage of the cathode of the diode D1 and outputting a high level or a low level to the base of the triode Q2 according to the detection result.
Optionally, the voltage detection circuit is implemented by using a 3V voltage detection circuit.
Optionally, the transistor Q1 is an NPN transistor.
Optionally, the transistor Q2 is a PNP transistor.
The utility model discloses a triode electricity generation, voltage detection judge, the function that discharges fast after the electric capacity energy storage power supply is realized to techniques such as electric capacity. The device can consume no current during normal work, and discharge large current rapidly during power failure. Due to the fact that the capacitive energy storage power supply mode is used, power-off discharge can be conducted to extremely low voltage (below 0.8V), and the capacitive energy storage power supply method is an advantage which is not possessed by other discharge circuits. When the power supply electric energy was not fully discharged again after the equipment outage, also the circumstances of just also repeating the power-on for a short time, the utility model discloses also can realize that discharge circuit closes fast, be converted to the normal operating condition of power, the difficult system fault that appears.
Drawings
Fig. 1 is a schematic structural diagram of a fast discharging circuit after power failure according to a first embodiment of the present invention;
fig. 2 is a waveform diagram of the energy storage power supply circuit according to the first embodiment of the present invention after the power supply is turned off;
fig. 3 is a waveform diagram of the power-off state of the fast discharging circuit after power-off in the first embodiment of the present invention;
fig. 4 is a waveform diagram of the power-off state of the rapid discharge circuit after the power-off state according to the first embodiment of the present invention.
Detailed Description
The first embodiment is as follows: as shown in fig. 1, the power circuit is used to supply power to the embedded circuit. The circuit for quickly discharging after power failure of the power supply in the embodiment comprises a discharging circuit, an energy storage power supply circuit and a voltage detection circuit;
the discharging circuit comprises a resistor R2, a resistor R3 and a PNP type triode Q2, one end of the resistor R2 is connected with one end of a resistor R3, the other end of the resistor R2 is connected with the base electrode of the triode Q2, the other end of the resistor R3 is connected with the emitter electrode of the triode Q2, and the collector electrode of the triode Q2 is connected with the power ground;
the energy storage power supply circuit comprises a diode D1, a capacitor C1, a resistor R1, an NPN type triode Q1 and a resistor R4, wherein the anode of the diode D1 is connected with a power supply access end (namely, a point A in fig. 1) of the embedded circuit, the cathode of the diode D1 is simultaneously connected with one end of the capacitor C1 and one end of the resistor R1, the cathode of the diode D1 is a point B, the other end of the capacitor C1 is connected with a power supply ground, the other end of the resistor R1 is connected with the collector of the triode Q1, the emission set of the triode Q1 is connected with the power supply ground, the base of the triode Q2 is connected with one end of the resistor R4, and the other end of the resistor;
the voltage detection circuit is realized by adopting a 3V voltage detection circuit, and the 3V voltage detection circuit is used for detecting the voltage of the cathode of the diode D1 and outputting a high level or a low level to the base electrode of the triode Q2 according to the detection result.
The 3V voltage detection circuit has the function of detecting the voltage at the point B, and when the voltage at the point B is lower than 3V, the output end C outputs high level; when the voltage at the point B is higher than 3V, the point C outputs a low level. The voltage at the point A can be quickly reduced to be below 3V after the power supply is powered off and then slowly reduced, so that the 3V voltage detection circuit can quickly judge whether the power supply is powered off or not.
The function of the discharge circuit is to discharge the charge stored in the power supply capacitor through the resistor R3 and the transistor Q2 when the power supply is powered off. When the voltage of the point B is higher than 3V (namely the power supply works normally), the point C at the output end of the 3V detection circuit outputs high level, the triode Q2 is cut off, and the discharge circuit is cut off; when the voltage of the point B is lower than 3V (namely, the power supply is cut off), the point C of the 3V detection circuit outputs low level, the triode Q2 is conducted, and the discharge circuit starts to work.
The energy storage power supply circuit has the function of storing charges, and the power supply circuit supplies power for the 3V voltage detection circuit after the power supply voltage is reduced to a certain degree. The principle is as follows: when the power supply normally works, the capacitor C1 is charged through the diode D1, the voltage at two ends of the capacitor C1 is close to the output voltage of the power supply, the C point of the '3V voltage detection circuit' outputs high level, and the transistor Q1 is conducted. When the power supply is disconnected, the power supply is quickly reduced to be below 3V, the capacitor C1 is discharged through the resistor R1 and the triode Q1 and also quickly reduced to be below 3V, at the moment, the output of the C point of the 3V voltage detection circuit is changed into low level, the triode Q1 is cut off, the capacitor C1 stops discharging, and the residual charges in the capacitor C1 continuously supply power for the 3V voltage detection circuit. Therefore, the 3V voltage detection circuit can continuously work under the condition that the power supply voltage is very low. The diode D1 can prevent the capacitor C1 from discharging to the power supply after the power supply is disconnected, and losing charge. Fig. 2 is an effect diagram of the energy storage power supply circuit, where a curve M is a power-off waveform of a power supply at a point a, and a curve N is a waveform of energy storage power supply at a point B. It can be seen from the figure that when the power supply voltage drops rapidly after power failure, Q1 is cut off after the voltage at point B drops for a while, the energy storage circuit supplies power for the "3V voltage detection circuit", and the voltage begins to drop slowly, because point B can keep a high voltage for a long time, the "3V voltage detection circuit" can work until the end of discharge.
In the fast discharging circuit after power failure according to this embodiment, before power failure, a point a is a high voltage, a point B is a high voltage, a point C of the "3V voltage detection circuit" also outputs a high level, the transistor Q1 is turned on, the transistor Q2 is turned off, and the discharging circuit is turned off; after the power supply is powered off, the voltage at the point A is quickly reduced to be lower than 3V, the voltage at the point B is also reduced to be lower than 3V through the resistor R1 and the triode Q1, the level at the point C of the 3V voltage detection circuit is inverted and becomes low level, the triode Q2 is conducted, the charge of the power supply is released through the resistor R3 and the triode Q2, the triode Q1 is cut off, the charge of the capacitor C1 supplies power to the 3V voltage detection circuit, the 3V voltage detection circuit is enabled to work continuously, and the level at the point C is kept low. The quick discharge circuit can also quickly turn off the discharge circuit after the power supply is powered off, the discharge circuit works, when the charges are not completely released, the voltage at the point B rapidly exceeds 3V, so that the point C outputs a high level, the triode Q2 is cut off, the discharge circuit stops working, and the power supply is recovered to a normal working state.
As shown in fig. 3, when the power supply not equipped with the fast discharge circuit of the present embodiment is powered off, the power supply voltage drops very slowly. As shown in fig. 4, the power supply configured with the fast discharge circuit of the embodiment after power failure has a significantly increased discharge speed and a discharge time of only 12 mS.
The quick discharge circuit after the power supply is powered off of the embodiment has the following advantages:
(1) the power consumption is low: when the power supply normally works, the triode Q2 is cut off, the discharge circuit is closed, and almost no power consumption exists;
(2) the discharge speed is high: after the power supply is powered off, the high-current rapid discharge is realized through the resistor R3 and the triode Q2, and as can be seen from figure 4, only 12mS is used from the power supply is powered off to the end of the electric energy release (below 0.8V).
(3) Low discharge cut-off voltage: the energy storage power supply circuit can still work under the condition that the power supply voltage is very low, and the discharging speed can be reduced to below 0.8V.
Claims (4)
1. A circuit for fast discharging after power failure, comprising: the device comprises a discharge circuit, an energy storage power supply circuit and a voltage detection circuit;
the discharge circuit comprises a resistor R2, a resistor R3 and a triode Q2, wherein one end of the resistor R2 is connected with one end of a resistor R3, the other end of the resistor R2 is connected with the base electrode of the triode Q2, the other end of the resistor R3 is connected with the emitter electrode of the triode Q2, and the collector electrode of the triode Q2 is connected with the power ground;
the energy storage power supply circuit comprises a diode D1, a capacitor C1, a resistor R1, a triode Q1 and a resistor R4, wherein the anode of the diode D1 is connected with the power supply access end and the cathode of the embedded circuit and is simultaneously connected with one end of a capacitor C1 and one end of a resistor R1, the other end of the capacitor C1 is connected with a power ground, the other end of the resistor R1 is connected with the collector of a triode Q1, the emitter of the triode Q1 is connected with the power ground, the base of the triode Q1 is connected with one end of a resistor R4, and the other end of the resistor R4 is connected with the base of the triode Q2;
the voltage detection circuit is used for detecting the voltage of the cathode of the diode D1 and outputting a high level or a low level to the base of the triode Q2 according to the detection result.
2. The circuit of claim 1, wherein the voltage detection circuit is implemented by a 3V voltage detection circuit.
3. The circuit of claim 1 or 2, wherein the transistor Q1 is an NPN transistor.
4. The circuit of claim 3, wherein the transistor Q2 is a PNP transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021579269.7U CN212695903U (en) | 2020-08-03 | 2020-08-03 | Quick discharge circuit after power failure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021579269.7U CN212695903U (en) | 2020-08-03 | 2020-08-03 | Quick discharge circuit after power failure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212695903U true CN212695903U (en) | 2021-03-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021579269.7U Active CN212695903U (en) | 2020-08-03 | 2020-08-03 | Quick discharge circuit after power failure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212695903U (en) |
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2020
- 2020-08-03 CN CN202021579269.7U patent/CN212695903U/en active Active
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210705 Address after: No.380, Xuefu Road, Nangang District, Harbin City, Heilongjiang Province Patentee after: HARBIN SYNJONES HUAKE ELECTRONIC EQUIPMENT Co.,Ltd. Address before: 150000 No. 102, Han River Road, Nangang District, Heilongjiang, Harbin Patentee before: HARBIN SYNJONES ELECTRONIC Co.,Ltd. |
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| TR01 | Transfer of patent right |