CN109104091B - Power supply circuit and power adapter - Google Patents
Power supply circuit and power adapter Download PDFInfo
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- CN109104091B CN109104091B CN201810914913.2A CN201810914913A CN109104091B CN 109104091 B CN109104091 B CN 109104091B CN 201810914913 A CN201810914913 A CN 201810914913A CN 109104091 B CN109104091 B CN 109104091B
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- 239000003990 capacitor Substances 0.000 claims description 53
- 238000004146 energy storage Methods 0.000 claims description 40
- 238000004804 winding Methods 0.000 claims description 18
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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Abstract
The invention discloses a power supply circuit, which comprises a power supply input end, a power supply output end, a switch control module, a rectification module, a power supply control module, a transformer module and an output module, wherein the power supply input end is connected with the power supply output end; the input end of the power supply is connected with the input end of the rectification module, the output end of the rectification module is respectively connected with the input end of the switch control module and the first input end of the transformer module, and the first output end of the switch control module is connected with the first input end of the transformer module; the input end of the power supply control module is connected with the second output end of the switch control module, and the output end of the power supply control module is connected with the second input end of the transformer module; the input end of the output module is connected with the output end of the transformer module, and the output end of the output module is connected with the power output end. The invention also discloses a power adapter. By adopting the embodiment of the invention, when the power failure occurs, the power supply can be continuously supplied to the equipment, so that the equipment can finish the sending of the Dying Gasp signal, and the cost is reduced.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a power circuit and a power adapter.
Background
The Dying gasp signal is a signal that when the system input voltage cannot meet the requirement of normal operation of the system, the system automatically sends a signal to the central office end to tell the central office end that the system may not operate normally. With the continuous development and progress of electronic products, various related technologies have a major breakthrough, when the current CPE (customer premises equipment) device is powered down, a dying gasp signal needs to be sent to the central office, the central office informs that the current CPE cannot work when the power down is about to occur, and the central office releases a channel used by the CPE after responding to the signal. In the prior art, after power failure occurs, power is continuously supplied to the equipment for a short time through an energy storage capacitor carried by CPE equipment, so that a CPU (central processing unit) in the equipment can complete sending of Dying Gasp signals, but the energy storage capacitor of the CPE can occupy the space of the CPE, the cost is higher, and for ensuring reliable sending of Dying Gasp messages, the energy storage circuit generally needs to maintain the CPE to work for about 10ms, so that the capacitance value of the energy storage circuit is large, the size of the energy storage circuit is large, and the occupied space of a PCB is large.
Disclosure of Invention
The embodiment of the invention aims to provide a power supply circuit and a power supply adapter, which can continuously supply power to equipment when power failure occurs, so that the equipment can finish sending of Dying Gasp signals, and the cost is reduced.
In order to achieve the above object, an embodiment of the present invention provides a power circuit, which includes a power input terminal, a power output terminal, a switch control module, a rectification module, a power control module, a transformer module, and an output module; wherein,
the input end of the power supply is connected with the input end of the rectification module, the output end of the rectification module is connected with the input end of the switch control module, the output end of the rectification module is also connected with the first input end of the transformer module, and the first output end of the switch control module is connected with the first input end of the transformer module;
the input end of the power supply control module is connected with the second output end of the switch control module, and the output end of the power supply control module is connected with the second input end of the transformer module; the input end of the output module is connected with the output end of the transformer module, and the output end of the output module is connected with the power supply output end;
the rectification module comprises an energy storage circuit, and the switch control module is used for adjusting the output voltage of the power output end to the threshold voltage triggering the Dying gasp function through the energy storage circuit when detecting that the power supply input end is powered down, so that the power supply circuit can continuously supply power for the equipment connected with the power supply circuit.
Compared with the prior art, the power supply circuit disclosed by the invention has the advantages that when the switch control module detects that the power failure occurs at the power supply input end, the output voltage of the power supply output end is adjusted to the threshold voltage triggering the Dying gasp function through the energy storage circuit, so that the power supply circuit can continuously supply power to the equipment connected with the power supply circuit. The problem of among the prior art take place to fall the power supply for equipment short time through the energy storage electric capacity that CPE equipment self carried, use CPE self energy storage electric capacity can occupy CPE's space, the cost is higher is solved simultaneously, still solved among the prior art simultaneously and to guarantee that the dinggasp message can reliably be sent, energy storage circuit generally need maintain CPE work about 10ms, consequently lead to energy storage circuit's electric capacity appearance value big, bulky and PCB occupation space is big problem. Can be in the collocation when power supply circuit uses, equipment need not additionally to add and increases electrolytic capacitor, the space and the cost of very big reduction equipment power supply circuit combines on the system of equipment, has reduced the total volume of placing of electric capacity, effectively reduces the cost, and the detection that falls the electric power to the AC simultaneously can effectively reduce and eliminate the false trigger of current DC detection mode, can be when the emergence falls the electric power condition, continues to supply power for equipment to make equipment can accomplish the sending of Dying Gasp signal, reduce cost.
As an improvement of the above scheme, the switch control module comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a triode, a first diode and a relay; wherein,
the first end of the first resistor is connected with the input end of the switch control module, the second end of the first resistor is connected with the first end of the second resistor, and the second end of the second resistor is grounded;
the first end of the triode is connected with the second end of the first resistor, the second end of the triode is connected with the anode of the first diode, the cathode of the first diode is connected with the second end of the third resistor, the first end of the third resistor is connected with the first output end of the switch control module, and the third end of the triode is grounded;
the first pin of the relay is connected with the second end of the third resistor, the second pin of the relay is connected with the first end of the fourth resistor, the third pin of the relay is connected with the second output end of the switch control module, the fourth pin of the relay is connected with the first end of the fifth resistor, the fifth pin of the relay is connected with the second end of the fifth resistor, the sixth pin of the relay is grounded, the seventh pin of the relay is connected with the second end of the fourth resistor, and the eighth pin of the relay is connected with the anode of the first diode.
As an improvement of the above scheme, the triode is an NPN type triode, a first end of the triode is a base of the NPN type triode, a second end of the triode is a collector of the NPN type triode, and a third end of the triode is an emitter of the NPN type triode.
As an improvement of the above scheme, the rectifier module further includes a second diode, a third diode, a fourth diode, and a fifth diode; wherein,
the anode of the second diode is grounded, the anode of the second diode is further connected with the anode of the fourth diode, the cathode of the fourth diode is connected with the input end of the rectification module, the cathode of the fourth diode is further connected with the anode of the fifth diode, the cathode of the fifth diode is connected with the output end of the rectification module, the cathode of the fifth diode is further connected with the cathode of the third diode, the anode of the third diode is connected with the cathode of the second diode, and the anode of the third diode is further connected with the input end of the rectification module;
the first end of the energy storage circuit is connected with the output end of the rectifying module, and the second end of the energy storage circuit is grounded.
As a modification of the above, the tank circuit includes a first capacitor; the first end of the first capacitor is connected with the first end of the energy storage circuit, and the second end of the first capacitor is connected with the second end of the energy storage circuit.
As an improvement of the above scheme, the power control module comprises a power control chip and a second capacitor; wherein,
a first pin of the power control chip is connected with the input end of the power control module; a second pin of the power supply control chip is connected with a first end of the second capacitor, and a second end of the second capacitor is grounded; a fourth pin of the power supply control chip is connected with the output end of the power supply control module; and a fifth pin, a sixth pin, a seventh pin and an eighth pin of the power supply control chip are all grounded.
As an improvement of the above scheme, the first pin of the power control chip is a feedback pin, and the fourth pin of the power control chip is a control pin.
As a modification of the above, the transformer module includes a transformer and a sixth resistor; the transformer comprises a first primary winding and a secondary winding of a second primary winding, a first end of the sixth resistor is connected with a first end of the second primary winding, and a second end of the sixth resistor is connected with a second output end of the switch control module.
As an improvement of the above scheme, the output module includes a sixth diode, a third capacitor, a fourth capacitor and a seventh resistor; wherein,
the anode of the sixth diode is connected with the input end of the output module, and the cathode of the sixth diode is connected with the output end of the output module; the first end of the third capacitor is connected with the output end of the output module, and the second end of the third capacitor is grounded; the first end of the fourth capacitor is connected with the output end of the output module, and the second end of the fourth capacitor is grounded; and the first end of the seventh resistor is connected with the output end of the output module, and the second end of the seventh resistor is grounded.
To achieve the above object, an embodiment of the present invention further provides a power adapter, which includes the power circuit as described in any of the above embodiments.
Drawings
Fig. 1 is a schematic structural diagram of a power supply circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a power circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a power supply circuit according to an embodiment of the present invention; the power supply control circuit comprises a power supply input end IN, a power supply output end OUT, a switch control module 1, a rectification module 2, a power supply control module 3, a transformer module 4 and an output module 5; wherein,
the power input terminal IN is connected to the input terminal IN1 of the rectifier module 2, the output terminal OUT1 of the rectifier module 2 is connected to the input terminal IN2 of the switch control module 1, the output terminal OUT1 of the rectifier module 2 is further connected to the first input terminal IN4 of the transformer module 4, and the first output terminal OUT2 of the switch control module 1 is connected to the first input terminal IN4 of the transformer module 4;
the input end IN3 of the power control module 3 is connected with the second output end OUT3 of the switch control module 1, and the output end OUT4 of the power control module 3 is connected with the second input end IN5 of the transformer module 4; the input end IN6 of the output module 5 is connected with the output end OUT5 of the transformer module 4, and the output end OUT6 of the output module 5 is connected with the power output end OUT;
the rectifying module 2 comprises an energy storage circuit, and the switch control module 1 is configured to adjust an output voltage of the power output terminal OUT to a threshold voltage triggering a Dyinggasp function through the energy storage circuit when detecting that the power supply input terminal IN is powered down, so that the power supply circuit continues to supply power to a device connected to the power supply circuit.
Specifically, referring to fig. 2, fig. 2 is a circuit diagram of a power circuit according to an embodiment of the present invention. The switch control module 1 comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a triode Q1, a first diode D1 and a relay K1; wherein,
a first end of the first resistor R1 is connected to the input terminal IN2 of the switch control module 1, a second end of the first resistor R1 is connected to a first end of the second resistor R2, and a second end of the second resistor R2 is grounded;
a first end of the triode Q1 is connected with a second end of the first resistor R1, a second end of the triode Q1 is connected with an anode of the first diode D1, a cathode of the first diode D1 is connected with a second end of the third resistor R3, a first end of the third resistor R3 is connected with a first output end OUT2 of the switch control module 1, and a third end of the triode Q1 is grounded;
a first pin of the relay K1 is connected to a second end of the third resistor R3, a second pin of the relay K1 is connected to a first end of the fourth resistor R4, a third pin of the relay K1 is connected to a second output end OUT3 of the switch control module 1, a fourth pin of the relay K1 is connected to a first end of the fifth resistor R5, a fifth pin of the relay K1 is connected to a second end of the fifth resistor R5, a sixth pin of the relay K1 is grounded, a seventh pin of the relay K1 is connected to a second end of the fourth resistor R4, and an eighth pin of the relay K1 is connected to an anode of the first diode D1.
Specifically, the transistor Q1, the first resistor R1 and the second resistor R2 are used for detecting AC power loss. As shown in FIG. 2, the AC power-down needs to be confirmed by detecting the value of U1, and when U1 is lower than the preset value U1min, the AC power-down is considered to be already achieved, for example, when the base voltage of the triode Q1, namely V, is detectedBU1 (R2/(R2+ R1)) is less than the voltage V of the base and emitter of the transistor Q1BEWhen the transistor Q1 is turned off, it indicates that the AC is powered down. Specifically, taking an AC input of 220V as an example, U1max isConsidering the charging and discharging of the first capacitor C1 to the alternating current signal and the ripple, it is preset that U1min is 280V, and when U1 is less than 280V, the AC is considered to be powered down. To ensure that false triggers are reduced, the margin may be increased appropriately here, taking into account fluctuations in the AC input.
Preferably, the transistor Q1 is an NPN transistor, the first terminal of the transistor Q1 is a base of the NPN transistor, the second terminal of the transistor Q1 is a collector of the NPN transistor, and the third terminal of the transistor Q1 is an emitter of the NPN transistor.
Specifically, the transformer module 4 includes a transformer T1 and a sixth resistor R6; the transformer T1 includes a first primary winding and a secondary winding of a second primary winding, a first end of the sixth resistor R6 is connected to a first end of the second primary winding, and a second end of the sixth resistor R6 is connected to a second output end OUT2 of the switch control module. The first end of the first primary winding is connected with the output end OUT1 of the rectifier module 2, the second end of the first primary winding is connected with the output end OUT4 of the power control module 3, the second end of the second primary winding is grounded, the first end of the secondary winding and the second end of the secondary winding are used as output windings (namely the output end OUT5 of the transformer module 4), and output voltage is provided for the output module 6.
Specifically, the relay K1 is used for switching a feedback resistor; the first diode D1 is used for freewheeling, and the third resistor R3 is used for limiting current, so that the relay K1 is prevented from being damaged by large current; when the fourth resistor is switched into the circuit, the sixth resistor R6 and the fourth resistor R4 are used for controlling the value of a normal output voltage Vout; when the fifth resistor R5 is connected to the circuit, the sixth resistor R6 and the fifth resistor R5 are used to control the value of the threshold voltage Vdying (i.e., the power output terminal OUT) output after power-down.
Specifically, the relay K1 operates when the transistor Q1 is turned off and turned on, wherein the specific operation process of the relay K1 is as follows: when the triode Q1 is in a conducting state, current flows through the third resistor R3 and pins 1 and 8 of the relay K1, the magnetic core of the relay K1 is charged, the inner spring piece of the relay K1 is attracted, at the moment, pins 3, 4, 6 and 5 of the relay K1 are respectively connected, namely, the circuit is connected corresponding to the fifth resistor R5, and the fourth resistor R4 is disconnected; when the triode Q1 is in an off state, energy in the magnetic core of the relay K1 is released and consumed through the first diode D1, the spring plate of the relay K1 bounces, at this time, pins 3, 2, 6 and 7 of the relay K1 are respectively connected, namely, the circuit is connected corresponding to the fourth resistor R4, and the fifth resistor R5 is disconnected.
Preferably, when the transistor Q1 is turned off, the relay K1 is turned from enable to disable, and is turned from the fifth resistor R5 to the fourth resistor R4, that is, the output voltage changes from Vout to Vdying, wherein: Vout-VFB*(1+R6/R5)；Vdying＝VFB*(1+R6/R4)；VFBThe reference voltage of the chip of the power supply circuit (namely the power supply control chip UB) is a fixed value related to the chip, and the reference voltage is used for calibrating the output voltage and ensuring the accuracy of the output voltage value.
Specifically, the rectifier module 2 further includes a second diode D2, a third diode D3, a fourth diode D4, and a fifth diode D5; wherein,
the anode of the second diode D2 is grounded, the anode of the second diode D2 is further connected to the anode of the fourth diode D4, the cathode of the fourth diode D4 is connected to the input terminal IN1 of the rectifier module 2, the cathode of the fourth diode D4 is further connected to the anode of the fifth diode D5, the cathode of the fifth diode D5 is connected to the output terminal OUT1 of the rectifier module 2, the cathode of the fifth diode D5 is further connected to the cathode of the third diode D3, the anode of the third diode D3 is connected to the cathode of the second diode D2, and the anode of the third diode D3 is further connected to the input terminal IN1 of the rectifier module 2; the first end of the energy storage circuit is connected with the output end OUT1 of the rectifying module 2, and the second end of the energy storage circuit is grounded.
Preferably, the energy storage circuit comprises a first capacitor C1; wherein a first terminal of the first capacitor C1 is connected to a first terminal of the tank circuit, and a second terminal of the first capacitor C1 is connected to a second terminal of the tank circuit.
Specifically, the second diode D2, the third diode D3, the fourth diode D4 and the fifth diode D5 constitute a rectifier bridge, and the input end IN1 of the rectifier module 2 includes two ends, which are respectively an H end and an L end shown IN fig. 2, where the H end is connected to the anode of the third diode D3, and the L end is connected to the cathode of the fourth diode D4. The rectifier bridge and the first capacitor C1 form a rectifier circuit, and the first capacitor C1 filters the direct current signal, so that a smoother direct current signal is obtained, and the direct current signal is also used as an energy storage device for realizing dying gasp.
Specifically, the power control module 3 includes a power control chip UB and a second capacitor C2; a first pin of the power control chip UB is connected to an input terminal IN3 of the power control module 3; a second pin of the power control chip UB is connected to a first end of the second capacitor C2, and a second end of the second capacitor C2 is grounded; a fourth pin of the power control chip UB is connected with an output end OUT4 of the power control module 3; and a fifth pin, a sixth pin, a seventh pin and an eighth pin of the power supply control chip UB are all grounded.
Preferably, the first pin of the power control chip UB is a feedback pin FB, and the fourth pin of the power control chip UB is a control pin D. Specifically, the power control chip UB mainly has two functions, namely, the control pin D is used as a switch of the power circuit, and the feedback pin FB is used to provide a feedback voltage. Preferably, the model of the power control chip UB is SC 1162.
Specifically, the output module 5 includes a sixth diode D6, a third capacitor C3, a fourth capacitor C4, and a seventh resistor R7; wherein the anode of the sixth diode D6 is connected to the input terminal IN6 of the output module 5, and the cathode of the sixth diode D6 is connected to the output terminal OUT6 of the output module 5; a first end of the third capacitor C3 is connected with the output end OUT6 of the output module 5, and a second end of the third capacitor C3 is grounded; a first end of the fourth capacitor C4 is connected with the output end OUT6 of the output module 5, and a second end of the fourth capacitor C4 is grounded; the first end of the seventh resistor R7 is connected to the output terminal OUT of the output module 5, and the second end of the seventh resistor R7 is grounded. Specifically, the sixth diode D6 is for freewheeling, the third capacitor C3 is used for output energy storage and ripple absorption, and the fourth capacitor C2 is used for filtering.
Specifically, the power supply circuit outputs a power-down signal when detecting the AC power-down, adjusts the output voltage Vout to the threshold voltage Vdying triggering Dying gasp within △ td, and keeps outputting for a certain time at Vdying, wherein the used energy storage is mainly the energy storage of the first capacitor C1, and the output voltage can be kept on Vdying for a certain time by depending on the energy storage of the first capacitor C1.
Defining the minimum effective input voltage of the power control chip UB during normal work as Unor _ min, the output power consumption of the power circuit as Po, the efficiency as eta, and calculating the specific time as follows: according to the law of conservation of energy, there is 0.5C 1 (U1 min)2-Unor_min2) △ t Po/η, wherein △ t is the voltage holding time.
Taking SC1162 as an example, the full-load output power consumption Po is 12W, Unor _ min is 50V, U1min is 280V, C1 is 22uF, η is 0.8, △ t is 55.66 ms., extreme conditions are considered, when 110V voltage input is adopted, the capacitance value of the first capacitor C1 needs to be increased to meet requirements, C1 is 47uF, U1min is 120V, △ t is 18.6 ms., only the first capacitor C1 needs to have 22uF or 47uF of stored energy, time that no less than 10ms is left after voltage drop for transmitting Dying gasp messages can be achieved, and parameters can be optimized to ensure that.
IN specific implementation, when the switch control module 1 detects that the power supply input end IN is powered down, the output voltage of the power supply output end OUT is adjusted to the threshold voltage triggering the Dying gasp function through the energy storage circuit, so that the power supply circuit continues to supply power to the equipment connected with the power supply circuit.
Compared with the prior art, the power supply circuit disclosed by the invention solves the problems that in the prior art, after power failure occurs, the equipment is continuously powered for a short time through the energy storage capacitor carried by CPE equipment, the energy storage capacitor of the CPE occupies the space of the CPE, and the cost is higher, and simultaneously solves the problems that in order to ensure that a dying gasp message can be reliably sent, the energy storage circuit generally needs to maintain the CPE to work for about 10ms, so that the capacitance value of the energy storage circuit is large, the size is large, and the occupied space of a PCB is large. Can be in the collocation when power supply circuit uses, the equipment need not additionally to add big electrolytic capacitor, and the space and the cost of very big reduction equipment, energy storage circuit have shared in rectifier module 2 first electric capacity C1 on power supply circuit combines the system of equipment, has reduced the total volume of placing of electric capacity, effectively reduce the cost, and the while falls the detection of electricity to the AC and can effectively reduce and eliminate the false triggering of current DC detection mode, can continue to supply power for equipment when the circumstances of falling the electricity takes place to make equipment can accomplish the sending of Dying Gasp signal, reduce cost.
An embodiment of the present invention further provides a power adapter, including the power circuit provided in the embodiment of the present invention, and a specific structure of the power circuit may refer to the description provided in the embodiment of the present invention, which is not described herein again.
Specifically, the power adapter can be matched with CPE equipment to realize the Dying Gasp function of the CPE equipment, the power adapter detects AC power failure and outputs a power failure signal, the output voltage Vout is adjusted to a threshold value Vdyng triggering Dying Gasp within △ td, the power adapter keeps outputting for a certain time at Vdyng, the used energy storage is mainly the energy storage of an input capacitor (namely, a first capacitor C1) at the front stage of a transformer of the power adapter, the CPE equipment judges that power failure is about to occur when voltage drop is detected, and accordingly a Dying Gasp message is sent to a local side.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A power supply circuit is characterized by comprising a power supply input end, a power supply output end, a switch control module, a rectification module, a power supply control module, a transformer module and an output module; wherein,
the input end of the power supply is connected with the input end of the rectification module, the output end of the rectification module is connected with the input end of the switch control module, the output end of the rectification module is also connected with the first input end of the transformer module, and the first output end of the switch control module is connected with the first input end of the transformer module;
the input end of the power supply control module is connected with the second output end of the switch control module, and the output end of the power supply control module is connected with the second input end of the transformer module; the input end of the output module is connected with the output end of the transformer module, and the output end of the output module is connected with the power supply output end;
the rectification module comprises an energy storage circuit, and the switch control module is used for adjusting the output voltage of the power output end to the threshold voltage triggering the Dying gasp function through the energy storage circuit when detecting that the power supply input end is powered down, so that the power supply circuit can continuously supply power for the equipment connected with the power supply circuit.
2. The power supply circuit of claim 1, wherein the switch control module comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a transistor, a first diode, and a relay; wherein,
the first end of the first resistor is connected with the input end of the switch control module, the second end of the first resistor is connected with the first end of the second resistor, and the second end of the second resistor is grounded;
the first end of the triode is connected with the second end of the first resistor, the second end of the triode is connected with the anode of the first diode, the cathode of the first diode is connected with the second end of the third resistor, the first end of the third resistor is connected with the first output end of the switch control module, and the third end of the triode is grounded;
the first pin of the relay is connected with the second end of the third resistor, the second pin of the relay is connected with the first end of the fourth resistor, the third pin of the relay is connected with the second output end of the switch control module, the fourth pin of the relay is connected with the first end of the fifth resistor, the fifth pin of the relay is connected with the second end of the fifth resistor, the sixth pin of the relay is grounded, the seventh pin of the relay is connected with the second end of the fourth resistor, and the eighth pin of the relay is connected with the anode of the first diode.
3. The power circuit as claimed in claim 2, wherein the transistor is an NPN transistor, the first terminal of the transistor is a base of the NPN transistor, the second terminal of the transistor is a collector of the NPN transistor, and the third terminal of the transistor is an emitter of the NPN transistor.
4. The power supply circuit of claim 1, wherein the rectification module further comprises a second diode, a third diode, a fourth diode, and a fifth diode; wherein,
the anode of the second diode is grounded, the anode of the second diode is further connected with the anode of the fourth diode, the cathode of the fourth diode is connected with the input end of the rectification module, the cathode of the fourth diode is further connected with the anode of the fifth diode, the cathode of the fifth diode is connected with the output end of the rectification module, the cathode of the fifth diode is further connected with the cathode of the third diode, the anode of the third diode is connected with the cathode of the second diode, and the anode of the third diode is further connected with the input end of the rectification module;
the first end of the energy storage circuit is connected with the output end of the rectifying module, and the second end of the energy storage circuit is grounded.
5. The power supply circuit of claim 4, wherein the tank circuit comprises a first capacitor; the first end of the first capacitor is connected with the first end of the energy storage circuit, and the second end of the first capacitor is connected with the second end of the energy storage circuit.
6. The power supply circuit according to claim 1, wherein the power supply control module includes a power supply control chip and a second capacitor; wherein,
the model of the power supply control chip is SC1162, and a first pin of the power supply control chip is connected with the input end of the power supply control module; a second pin of the power supply control chip is connected with a first end of the second capacitor, and a second end of the second capacitor is grounded; a fourth pin of the power supply control chip is connected with the output end of the power supply control module; and a fifth pin, a sixth pin, a seventh pin and an eighth pin of the power supply control chip are all grounded.
7. The power supply circuit of claim 6, wherein the first pin of the power control chip is a feedback pin and the fourth pin of the power control chip is a control pin.
8. The power supply circuit of claim 2, wherein the transformer module includes a transformer and a sixth resistor; the transformer comprises a first primary winding and a secondary winding of a second primary winding, a first end of the sixth resistor is connected with a first end of the second primary winding, and a second end of the sixth resistor is connected with a second output end of the switch control module.
9. The power supply circuit according to claim 1, wherein the output module includes a sixth diode, a third capacitor, a fourth capacitor, and a seventh resistor; wherein,
the anode of the sixth diode is connected with the input end of the output module, and the cathode of the sixth diode is connected with the output end of the output module; the first end of the third capacitor is connected with the output end of the output module, and the second end of the third capacitor is grounded; the first end of the fourth capacitor is connected with the output end of the output module, and the second end of the fourth capacitor is grounded; and the first end of the seventh resistor is connected with the output end of the output module, and the second end of the seventh resistor is grounded.
10. A power adapter comprising the power circuit according to any one of claims 1 to 9.
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| CN201810914913.2A CN109104091B (en) | 2018-08-13 | 2018-08-13 | Power supply circuit and power adapter |
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| CN201810914913.2A CN109104091B (en) | 2018-08-13 | 2018-08-13 | Power supply circuit and power adapter |
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| CN109104091A CN109104091A (en) | 2018-12-28 |
| CN109104091B true CN109104091B (en) | 2020-01-21 |
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| CN112083784B (en) * | 2020-07-23 | 2022-09-20 | 广西电网有限责任公司电力科学研究院 | Power-down time sequence circuit of power distribution terminal |
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| US7249282B2 (en) * | 2002-04-29 | 2007-07-24 | Thomson Licensing | Eeprom enable |
| CN101521410B (en) * | 2008-11-24 | 2010-12-22 | 三一重工股份有限公司 | Method and device for power failure safeguard |
| CN104599850B (en) * | 2014-12-30 | 2017-10-10 | 华为技术有限公司 | A kind of charging method and device |
| CN206292721U (en) * | 2016-09-05 | 2017-06-30 | 深圳市炜烨丰电子科技有限公司 | A kind of hard disk protection circuit of ac grid voltage mutation |
| CN206209032U (en) * | 2016-11-15 | 2017-05-31 | 广州视源电子科技股份有限公司 | Power failure detection circuit and switching power supply circuit |
| CN106886273A (en) * | 2017-02-24 | 2017-06-23 | 济南浪潮高新科技投资发展有限公司 | A kind of power-down protection circuit |
| CN107767489A (en) * | 2017-09-13 | 2018-03-06 | 陕西千山航空电子有限责任公司 | A kind of power supply module and power down control method for protecting logger |
| CN107706966A (en) * | 2017-09-22 | 2018-02-16 | 安徽皖通邮电股份有限公司 | Method for the extension power-off retention time of DyingGasp functions |
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