CN112003363B - Embedded power supply system management circuit - Google Patents
Embedded power supply system management circuit Download PDFInfo
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- CN112003363B CN112003363B CN202010766966.1A CN202010766966A CN112003363B CN 112003363 B CN112003363 B CN 112003363B CN 202010766966 A CN202010766966 A CN 202010766966A CN 112003363 B CN112003363 B CN 112003363B
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- 238000001514 detection method Methods 0.000 claims abstract description 24
- 238000007493 shaping process Methods 0.000 claims abstract description 4
- 238000007599 discharging Methods 0.000 claims abstract description 3
- 230000005669 field effect Effects 0.000 claims description 60
- 239000003990 capacitor Substances 0.000 claims description 19
- 230000003111 delayed effect Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 8
- 238000007726 management method Methods 0.000 description 7
- 230000009977 dual effect Effects 0.000 description 3
- 238000013500 data storage Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
An embedded power supply system management circuit belongs to the system power supply management circuit technology. The power failure detection unit circuit is used for detecting whether a main power supply is powered down, and the dual-power switching unit circuit is used for switching between the main power supply and a standby power supply; the delay turn-off control unit circuit is used for starting delay when the main power supply is powered off, and giving a turn-off signal to the dual-power supply switching unit circuit after a period of delay, so as to turn off the power supply of the whole system; the voltage detection unit circuit is used for providing variable signals for the whole circuit implementation function; the discharging unit circuit is used for rapidly releasing residual charges in the circuit after the circuit is powered off; the power-on whole wave unit circuit is used for enabling the voltage of the load to start power supply to start from approximately 3V, and the unstable part of the intermediate voltage is removed. The invention has the advantages that: seamless switching of the main power supply to the standby power supply; switching off the standby power supply in a delayed manner; notifying a control system to store data when the main power supply is powered down for detection; and the system stability is improved by fast power-off wave shaping and power-on wave shaping.
Description
Technical Field
The invention belongs to the system power management circuit technology.
Background
With the rapid development of electronic technology, more and more chips can run a system on a chip. With the consequent higher and higher demands on the power supply. In the actual test of the product, after the power supply is powered off, the electric energy remained in the capacitor cannot be quickly released, so that the power supply voltage is slowly reduced, and if the power supply is powered on at this time, the starting faults of an embedded system and the like are likely to be caused. Most systems discharge by connecting a resistor in parallel with the power supply output. The mode has the advantages of simple structure, low discharge speed and high energy consumption in normal operation. And may also lead to a certain probability of system failure.
In addition, a dual power supply is commonly used in a system needing backup and data storage, and when the main power supply is powered off, the standby power supply supplies power to the system, so that the purposes of data backup and data storage are achieved. The existing products mainly adopt a relay control circuit or a simple triode switching circuit to realize the alternation of a main power supply and a standby power supply. The relay control mode has larger time delay, and the problems of large power supply fluctuation, poor reliability and the like exist in the power supply switching process; the power supply voltage loss of the triode switching circuit is large, and the switching-off process needs to pass through an amplifying region of the triode, so that the switching-off is slow, the voltage gradually becomes low, and the stability of the system is very unfavorable.
Disclosure of Invention
The present invention aims to overcome or at least partially solve or alleviate the above-mentioned problems.
The invention relates to an embedded power system management circuit which comprises a power-down detection unit circuit, a dual-power switching unit circuit, a delay turn-off control unit circuit, a voltage detection unit circuit, a discharge unit circuit and a power-on whole wave unit circuit;
The power failure detection unit circuit comprises a resistor R10, a resistor R11 and a capacitor C2; the resistor R11 and the capacitor C2 are connected in parallel to form a parallel circuit, one end of the parallel circuit is connected with one end of the resistor R10, a connection point is used as a power failure detection point, the other end of the resistor R10 is connected with a main power supply, and the other end of the parallel circuit is connected with a power supply ground;
The voltage detection unit circuit is realized by a 3V voltage judgment circuit;
The dual-power switching unit circuit comprises a field effect transistor Q1, a field effect transistor Q2, a field effect transistor Q3, a resistor R4 and a resistor R5; the source electrode of the field effect tube Q1 is connected with one end of the resistor R3, and the connection point is simultaneously connected with a standby power supply; the grid electrode of the field effect transistor Q1 is connected with one end of the resistor R4; the drain electrode of the field effect tube Q3 is simultaneously connected with the other end of the resistor R3 and the other end of the resistor R4, the source electrode is connected with the power ground, and the grid electrode is connected with the output end of the 3V voltage judging circuit in series with the resistor R5; the drain electrode of the field effect tube Q2 is connected with the drain electrode of the field effect tube Q1, the source electrode is connected with a load, and the grid electrode is connected with a main power supply;
The delay turn-off control unit circuit comprises a diode D1, a capacitor C1 and a resistor R6; the anode of the diode D1 is connected with a main power supply, the cathode of the diode D1 is simultaneously connected with one end of the resistor R6, the anode of the capacitor C1 and the detection signal input end of the 3V voltage judging circuit, and the other end of the resistor R6 and the cathode of the capacitor C1 are connected with a power supply ground;
The discharging unit circuit comprises a resistor R1, a resistor R2 and a triode Q4, wherein the base electrode of the triode Q4 is simultaneously connected with the output end of the 3V voltage judging circuit, one end of the resistor R1, the emitting electrode of the triode Q is connected with one end of the resistor R2, the collecting electrode of the triode Q is connected with the power ground, the other end of the resistor R1 is connected with the other end of the resistor R2, and the connecting point of the triode Q is connected with the load.
The power-on whole wave unit circuit comprises a resistor R7, a resistor R8, a resistor R9, a field effect transistor Q5, a field effect transistor Q6 and a diode D2; the source electrode of the field effect tube Q5 is simultaneously connected with one end of the resistor R7 and the cathode of the diode D2, the drain electrode is connected with a load, the grid electrode is connected with one end of the resistor R8, the anode of the diode D2 is connected with a main power supply, the source electrode of the field effect tube Q6 is connected with the ground of the power supply, the drain electrode is connected with the other end of the resistor R7 and the other end of the resistor R8, and the grid electrode is connected with the output end of the 3V voltage judging circuit in series with the resistor R9.
Optionally, the main power supply comprises a 220V alternating current power supply and a transformer connected with the 220V alternating current power supply; and the output end of the transformer is used as a connection point of the main power supply and the dual power supply fast switching delay turn-off circuit.
Optionally, the transformer is used for transforming, rectifying and stabilizing the 220V alternating current, and the output voltage of the transformer is 5V.
Optionally, the standby power supply is a 4.2V dc power supply.
Optionally, the field effect transistor Q1 is a P-channel field effect transistor.
Optionally, the field effect transistor Q2 is a P-channel field effect transistor.
Optionally, the field effect transistor Q3 is an N-channel field effect transistor.
Optionally, the triode Q4 is a PNP triode.
The embedded power supply system management circuit has the following advantages:
The main power supply is seamlessly switched to the standby power supply;
Switching off the standby power supply in a delayed manner;
the main power supply power failure detection can inform the control system of saving data;
The power is cut off to carry out quick wave shaping, residual charges in a circuit are released, and the stability of a system is improved;
And the power-on whole wave is performed, and the load is not powered on when the power supply voltage is not 3V, so that the system stability is improved.
Drawings
Fig. 1 is a schematic structural diagram of an embedded power system management circuit according to an embodiment of the present invention.
Detailed Description
The first embodiment is as follows: as shown in fig. 1, an embedded power system management circuit according to this embodiment includes a power-down detection unit circuit, a dual power switching unit circuit, a delay turn-off control unit circuit, a voltage detection unit circuit, a discharge unit circuit, and a power-on whole wave unit circuit. The function and principle of the modules are described below, respectively.
The power failure detection unit circuit comprises a resistor R10, a resistor R11 and a capacitor C2, and is used for detecting whether the power of the 5V main power supply is off or not. When the 5V main power supply supplies power, the level of a power failure detection point is high; when the 5V main power supply is powered off, the level of the power failure detection point is low. Therefore, the processor can know the power supply condition of the 5V main power supply by monitoring the level of the power failure monitoring point, and data processing and backup work are performed.
The dual-power switching unit circuit comprises a field effect tube Q1, a field effect tube Q2, a field effect tube Q3, a resistor R4 and a resistor R5, and has the functions of realizing the on-off of a '4.2V standby power supply', when the grid electrode of the field effect tube Q3 is in a low level, the field effect tube Q3 is cut off, 4.2V standby power supply voltage reaches the drain electrode of the field effect tube Q3 through the resistor R3 and the resistor R4, the field effect tube Q1 is cut off, the point B has no voltage, and the 4.2V standby power supply does not work; when the grid electrode of the field effect tube Q3 is at a high level, the field effect tube Q3 is conducted, the grid electrode of the field effect tube Q1 is at a low level, the field effect tube Q1 is conducted, the point B is approximate to the standby power supply voltage, and the standby power supply is conducted. The field effect transistor Q2 is a backflow prevention protection unit. When the main power supply supplies power, the source voltage of the field effect transistor Q2 is lower than the gate voltage, and the field effect transistor Q2 is cut off. The 5V main power supply at point C does not reach point B. And the current is prevented from flowing backward to the standby power supply, so that the standby power supply is prevented from being burnt. When the standby power supply works, the standby power supply is conducted to the point C through the parasitic diode of the field effect transistor Q2, so that the standby power supply acts on a load.
The delay turn-off control unit circuit comprises a diode D1, a capacitor C1 and a resistor R6; the delay turn-off control unit circuit provides a delay signal for turning off the 4.2V standby power supply, namely, the delay is started when the main power supply is powered off, and a turn-off signal is given to the dual-power supply switching unit circuit after a period of delay, so that the power supply of the whole system is turned off. The time delay principle is as follows: when the main power supply is powered, the capacitor C1 is charged through the diode D1, the point D reaches the voltage V1 (V1 = main power supply voltage-diode D1 voltage drop), after the main power supply is powered off, the capacitor C1 is slowly discharged through the resistor R6, and the point D voltage is gradually reduced, so that the function of time delay is achieved. The calculation formula of the delay time t is as follows: t= RCln [ Vu/(Vu-Vt) ], where Vu is the termination voltage value at which capacitor C1 is filled; vt is the voltage value at two ends of the capacitor C1 at the moment t, R is the resistance value of the resistor R6, and C is the capacitance value of the capacitor C1.
The voltage detection unit circuit comprises a 3V voltage detection circuit and has an input end and an output end. The principle is that the voltage value of the input terminal is used for determining the level of the output terminal. The output terminal becomes high level when the voltage value of the input terminal is higher than 3V, and becomes low level when the voltage of the input terminal is lower than 3V. The function is to provide a variable signal for the whole circuit to realize the function.
The discharge cell circuit includes a resistor R1, a resistor R2, and a transistor Q4. The function is realized by quickly releasing residual charges in the circuit after the circuit is powered off. The working principle is that when the level of the point A is high, a main power supply or a 4.2V standby power supply supplies power to a load, the triode Q4 is cut off, and the discharge circuit does not work; when the point A becomes low level, the power supply is turned off, the triode Q4 is turned on, and residual charges in the circuit are released through the resistor R2.
The power-on whole wave unit circuit comprises a diode D2, a field effect transistor Q5, a field effect transistor Q6, a resistor R7, a resistor R8 and a resistor R9. The method has the effects of rectifying the power-on process, shortening the time from the level to the high level of the load and improving the stability of the load. The working principle is that when the power-on is just started, the voltage of the point D gradually increases, the point A outputs low level, the field effect transistor Q6 is cut off, the field effect transistor Q5 is also cut off, and the power supply does not supply power to a load; when the voltage of the point D rises to 3V, the point A outputs a high level, the field effect transistor Q6 is conducted, the field effect transistor Q5 is also conducted, and the 5V main power supply supplies power to a load through the diode D2 and the field effect transistor Q5. The voltage at which the load starts to supply power can be started from approximately 3V instead of 0V through the above process, and the unstable part of the intermediate voltage is removed.
The working state of the embedded power system management circuit is divided into four states of main power supply power-on, main power supply switching to standby power supply, standby power supply delayed shut-off and power-off charge release. The detailed procedures of these several operating states are described below, respectively.
And (5) powering up a main power supply: after the 5V main power supply starts to be electrified, the voltage of the point D gradually rises, the point A outputs a low level, the field effect tube Q1 and the field effect tube Q5 are in a cut-off state, and the point C of the load is not powered; when the voltage of the point D rises to 3V, the field effect transistor Q1 and the field effect transistor Q5 are conducted, the main power supply and the standby power supply are both conducted, and the load is powered by the main power supply under the action of the field effect transistor Q2 because the voltage of the main power supply is higher than that of the standby power supply. In the process, the filtering of the electrified unstable voltage is realized through the electrified whole wave circuit, so that the load starts to supply power when the power supply voltage is close to 3V, and the stability of the system is improved.
The main power supply is switched to the standby power supply: after the main power supply is powered off, the voltage of the point C is lower than that of the point B, and the 4.2V standby power supply supplies power to the load through Q2. Simultaneously, the capacitor C1 discharges through the resistor R6, and the voltage at the point D gradually becomes lower. The power down detection point goes low and the processor begins to process and backup data.
And (5) switching off the standby power supply in a delayed manner: when the D point is reduced to below 3V, the output of the A point is changed to be low level, the field effect transistor Q3 and the field effect transistor Q1 are cut off, and the 4.2V standby power supply stops supplying power to the load.
Power-off charge release: after the point A is changed into low level, the standby power supply stops supplying power, the triode Q4 is conducted, residual charges in the circuit are released through the resistor R2 and the field effect transistor Q4, and therefore the power supply voltage can be quickly reduced to very low voltage, and the stability of the system is improved.
Claims (6)
1. The embedded power supply system management circuit is characterized by comprising a power-down detection unit circuit, a dual-power switching unit circuit, a delay turn-off control unit circuit, a voltage detection unit circuit, a discharge unit circuit and a power-on wave-shaping unit circuit;
The power failure detection unit circuit comprises a resistor R10, a resistor R11 and a capacitor C2; the resistor R11 and the capacitor C2 are connected in parallel to form a parallel circuit, one end of the parallel circuit is connected with one end of the resistor R10, a connection point is used as a power failure detection point, the other end of the resistor R10 is connected with a main power supply, and the other end of the parallel circuit is connected with a power supply ground;
The voltage detection unit circuit is realized by a 3V voltage judgment circuit;
The dual-power switching unit circuit comprises a field effect transistor Q1, a field effect transistor Q2, a field effect transistor Q3, a resistor R4 and a resistor R5; the source electrode of the field effect tube Q1 is connected with one end of the resistor R3, and the connection point is simultaneously connected with a standby power supply; the grid electrode of the field effect transistor Q1 is connected with one end of the resistor R4; the drain electrode of the field effect tube Q3 is simultaneously connected with the other end of the resistor R3 and the other end of the resistor R4, the source electrode is connected with the power ground, and the grid electrode is connected with the output end of the 3V voltage judging circuit in series with the resistor R5; the drain electrode of the field effect tube Q2 is connected with the drain electrode of the field effect tube Q1, the source electrode is connected with a load, and the grid electrode is connected with a main power supply;
The delay turn-off control unit circuit comprises a diode D1, a capacitor C1 and a resistor R6; the anode of the diode D1 is connected with a main power supply, the cathode of the diode D1 is simultaneously connected with one end of the resistor R6, the anode of the capacitor C1 and the detection signal input end of the 3V voltage judging circuit, and the other end of the resistor R6 and the cathode of the capacitor C1 are connected with a power supply ground;
The discharging unit circuit comprises a resistor R1, a resistor R2 and a triode Q4, wherein the base electrode of the triode Q4 is simultaneously connected with the output end of the 3V voltage judging circuit and one end of the resistor R1, the emitter is connected with one end of the resistor R2, the collector is connected with the power ground, the other end of the resistor R1 is connected with the other end of the resistor R2, and the connecting point is connected with the load;
The power-on whole wave unit circuit comprises a resistor R7, a resistor R8, a resistor R9, a field effect transistor Q5, a field effect transistor Q6 and a diode D2; the source electrode of the field effect tube Q5 is simultaneously connected with one end of the resistor R7 and the cathode of the diode D2, the drain electrode is connected with a load, the grid electrode is connected with one end of the resistor R8, the anode of the diode D2 is connected with a main power supply, the source electrode of the field effect tube Q6 is connected with the ground of the power supply, the drain electrode is connected with the other end of the resistor R7 and the other end of the resistor R8, and the grid electrode is connected with the output end of the 3V voltage judging circuit in series with the resistor R9.
2. An embedded power system management circuit according to claim 1, wherein the backup power source is a 4.2V dc power source.
3. The embedded power system management circuit of claim 1, wherein the fet Q1 is a P-channel fet.
4. The embedded power system management circuit of claim 3, wherein the fet Q2 is a P-channel fet.
5. The embedded power system management circuit of claim 4, wherein the fet Q3 is an N-channel fet.
6. The embedded power system management circuit of claim 1, wherein the transistor Q4 is a PNP transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010766966.1A CN112003363B (en) | 2020-08-03 | 2020-08-03 | Embedded power supply system management circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010766966.1A CN112003363B (en) | 2020-08-03 | 2020-08-03 | Embedded power supply system management circuit |
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| CN112003363A CN112003363A (en) | 2020-11-27 |
| CN112003363B true CN112003363B (en) | 2024-05-24 |
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| CN202010766966.1A Active CN112003363B (en) | 2020-08-03 | 2020-08-03 | Embedded power supply system management circuit |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114123467A (en) * | 2021-11-19 | 2022-03-01 | 合肥工业大学 | Intelligent transformer double-circuit power supply system and master-slave power supply switching method |
| CN117081029B (en) * | 2023-10-13 | 2024-04-26 | 苏州琨山通用锁具有限公司 | Heavy-current reverse connection preventing and dual-power automatic switching circuit of intelligent lockset |
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| CN112003363A (en) | 2020-11-27 |
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