CN218771268U - Power supply circuit with protection function - Google Patents
Power supply circuit with protection function Download PDFInfo
- Publication number
- CN218771268U CN218771268U CN202222673334.8U CN202222673334U CN218771268U CN 218771268 U CN218771268 U CN 218771268U CN 202222673334 U CN202222673334 U CN 202222673334U CN 218771268 U CN218771268 U CN 218771268U
- Authority
- CN
- China
- Prior art keywords
- module
- resistor
- power failure
- power
- diode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The utility model discloses a power supply circuit with protect function relates to the power supply field, and this power supply circuit with protect function includes: the commercial power supply module is used for introducing 220V alternating current and outputting the alternating current to the voltage reduction rectification filtering module; the voltage reduction rectification filtering module is used for converting 220V alternating current into direct current; the power failure detection module is used for detecting whether power failure occurs or not, and when the power failure does not occur, the power failure processing module is conducted; when the power is off, the power-off processing module is cut off; the power failure processing module is used for controlling the circuit to be grounded and powered off when the power failure occurs; the stable output voltage module is used for outputting stable voltage to supply a load; compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a power down detection module detection voltage size, when the voltage falls the electricity, start the power down processing module, the power down processing module ground connection earial drainage stops to be the power supply of stable output voltage module, prevents to fall the load damage under the electric situation.
Description
Technical Field
The utility model relates to a power supply field specifically is a power supply circuit with protect function.
Background
Each electronic device has a power supply circuit for supplying power. Most of the common household appliances use a dc power supply. The simplest method of supplying power from a dc power source is by battery. However, batteries have the disadvantages of high cost, large size, and need to be replaced from time to time (batteries are frequently charged), and therefore it is most convenient and economical to use rectified power.
Undervoltage/power-down is an undervoltage that occurs when power demand exceeds the power supply, typically lasting several minutes, but may also last several hours. Most power problems are caused by a power loss rather than a power outage.
The existing power supply circuit lacks power-down protection, so that a load still supplies power under the power-down condition, and for an electric appliance with a motor, the insufficient voltage can cause insufficient motor output, inductive reactance is reduced, total impedance is reduced, current is increased, and therefore a coil is burnt out, and the prior art needs to be improved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a power supply circuit with protect function to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
a power supply circuit having a protection function, comprising:
the commercial power supply module is used for introducing 220V alternating current and outputting the alternating current to the voltage reduction rectification filtering module;
the voltage reduction rectification filtering module is used for converting 220V alternating current into direct current;
the power failure detection module is used for detecting whether power failure occurs or not, and when the power failure does not occur, the power failure processing module is conducted; when the power is off, the power-off processing module is cut off;
the power failure processing module is used for controlling the circuit to be grounded and powered off when the power failure occurs;
the stable output voltage module is used for outputting stable voltage to supply a load;
the mains supply module is connected with the voltage-reducing rectifying and filtering module, the voltage-reducing rectifying and filtering module is connected with the power failure detection module and the power failure processing module, the power failure detection module is connected with the power failure processing module, and the power failure processing module is connected with the stable output voltage module.
As the utility model discloses further scheme again: the voltage reduction, rectification and filtering module comprises a transformer W, a diode D1, a diode D2, a diode D3, a diode D4, a capacitor C1, an inductor L1, a resistor R1 and a resistor R2, wherein the input end of the transformer W is connected with the mains supply module, one end of the output end of the transformer W is connected with the anode of the diode D1 and the cathode of the diode D3, the other end of the output end of the transformer W is connected with the anode of the diode D2 and the cathode of the diode D4, the cathode of the diode D1 is connected with the cathode of the diode D2, one end of the capacitor C1 and one end of the inductor L1, the anode of the diode D3 is connected with the anode of the diode D4, the other end of the capacitor C1 and one end of the resistor R1, the other end of the inductor L1 is connected with the other end of the resistor R1 and one end of the resistor R2, the other end of the resistor R2 is connected with a power failure detection module and a power failure processing module.
As a further aspect of the present invention: the power failure detection module comprises a diode D5, a resistor R3, a resistor R4 and a triode V1, wherein the negative electrode of the diode D5 is connected with one end of the resistor R4 and a voltage reduction rectification filtering module, the positive electrode of the diode D5 is connected with one end of the resistor R3 and the base electrode of the triode V1, the other end of the resistor R4 is connected with the collector electrode of the triode V1 and a power failure processing module, the emitting electrode of the triode V1 is grounded, and the other end of the resistor R3 is grounded.
As a further aspect of the present invention: the power down processing module comprises a resistor R5, a resistor R6, an MOS (metal oxide semiconductor) tube V4, a capacitor C2, a triode V3, one end of the capacitor C2 is connected with the base of the triode V2, the collector of the triode V1, the other end of the capacitor C2 is grounded, the base of the triode V3 is connected with the emitter of the triode V2, the emitter of the triode V3 is grounded, the collector of the triode V3 is connected with the collector of the triode V2, one end of the resistor R6, the G pole of the MOS tube V4, one end of the resistor R6 is connected with the other end of the resistor R6, the D pole of the MOS tube V4, the other end of the resistor R5 is connected with a buck rectification filter module, and the S pole of the MOS tube V4 is connected with a stable output voltage module.
As a further aspect of the present invention: the stable output voltage module comprises a capacitor C3, a voltage stabilizer U1 and a capacitor C4, wherein the input end of the voltage stabilizer U1 is connected with one end of the capacitor C3 and a power failure processing module, the other end of the capacitor C3 is grounded, the grounding end of the voltage stabilizer U1 is grounded, the output end of the voltage stabilizer U1 is connected with one end of the capacitor C4, and the other end of the capacitor C4 is grounded.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a power down detection module detection voltage size, when the voltage falls the electricity, start the power down processing module, the power down processing module ground connection earial drainage stops to be the power supply of stable output voltage module, prevents to fall the load damage under the electric situation.
Drawings
Fig. 1 is a schematic diagram of a power supply circuit having a protection function.
Fig. 2 is a circuit diagram of a power supply circuit with a protection function.
Fig. 3 is a pin diagram of LM 2937.
Detailed Description
The technical solution 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 some embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention based on the embodiments of the present invention.
Referring to fig. 1, a power circuit with protection function includes:
the mains supply module is used for introducing 220V alternating current and outputting the alternating current to the voltage reduction rectification filtering module;
the voltage reduction, rectification and filtering module is used for converting 220V alternating current into direct current;
the power failure detection module is used for detecting whether power failure occurs or not, and when the power failure does not occur, the power failure processing module is conducted; when the power is off, the power-off processing module is cut off;
the power failure processing module is used for controlling the circuit to be grounded and powered off when the power failure occurs;
the stable output voltage module is used for outputting stable voltage to supply a load;
the mains supply module is connected with the voltage-reducing rectifying and filtering module, the voltage-reducing rectifying and filtering module is connected with the power failure detection module and the power failure processing module, the power failure detection module is connected with the power failure processing module, and the power failure processing module is connected with the stable output voltage module.
In this embodiment: referring to fig. 2, the buck rectifying and filtering module includes a transformer W, a diode D1, a diode D2, a diode D3, a diode D4, a capacitor C1, an inductor L1, a resistor R1, and a resistor R2, an input end of the transformer W is connected to the mains supply module, an output end of the transformer W is connected to an anode of the diode D1 and a cathode of the diode D3, another output end of the transformer W is connected to an anode of the diode D2 and a cathode of the diode D4, a cathode of the diode D1 is connected to a cathode of the diode D2, one end of the capacitor C1 and one end of the inductor L1, an anode of the diode D3 is connected to an anode of the diode D4, another end of the capacitor C1 and one end of the resistor R1, another end of the resistor R1 is connected to another end of the inductor L1 and one end of the resistor R2, another end of the resistor R2 is connected to the power failure detection module and the power failure processing module.
220V alternating current of mains supply module is introduced through the diplopore plug, and through transformer W with 220V alternating current conversion low-voltage alternating current, through the bridge rectifier circuit that diode D1 to D4 constitute, convert the alternating current into the direct current, carry out filtering process through the filter circuit that electric capacity C1, inductance L1, resistance R1 constitute.
In this embodiment: referring to fig. 2, the power failure detection module includes a diode D5, a resistor R3, a resistor R4, and a transistor V1, a negative electrode of the diode D5 is connected to one end of the resistor R4 and the buck rectification filter module, a positive electrode of the diode D5 is connected to one end of the resistor R3 and a base of the transistor V1, the other end of the resistor R4 is connected to a collector of the transistor V1 and the power failure processing module, an emitter of the transistor V1 is grounded, and the other end of the resistor R3 is grounded.
When the output voltage of the voltage reduction rectification filter module is normal, the voltage stabilizing diode D5 is conducted, the triode V1 is conducted, further, the current flowing through the resistor R4 is grounded through the triode V1 and does not flow to the triode V2, and the power failure processing module is conducted to supply power for the stable output voltage module; when the output voltage of the voltage reduction rectification filter module is in power failure, the voltage stabilizing diode D5 is cut off, the triode V2 is conducted, the current flowing through the resistor R4 flows to the triode V2, and at the moment, the power failure processing module is cut off and stops supplying power to the stable output voltage module.
In this embodiment: referring to fig. 2, the power down processing module includes a resistor R5, a resistor R6, an MOS transistor V4, a capacitor C2, a transistor V2, and a transistor V3, wherein a base of the transistor V2 is connected to one end of the capacitor C2 and a collector of the transistor V1, another end of the capacitor C2 is grounded, an emitter of the transistor V2 is connected to a base of the transistor V3, an emitter of the transistor V3 is grounded, a collector of the transistor V2 is connected to a collector of the transistor V3, one end of the resistor R6 and a G pole of the MOS transistor V4, another end of the resistor R6 is connected to one end of the resistor R5 and a D pole of the MOS transistor V4, another end of the resistor R5 is connected to the buck rectifying and filtering module, and an S pole of the MOS transistor V4 is connected to the stable output voltage module.
When the output voltage of the voltage reduction rectification filter module is normal, the G electrode of the MOS tube V4 is at a high level, and the MOS tube V4 is conducted to supply power for the stable output voltage module; when step-down rectifier filter module output voltage falls the power supply, the electric current that flows through resistance R4 charges for electric capacity C2 for triode V2 switches on, and then triode V3 switches on, and the ground connection earial drainage draws low MOS pipe V4's G utmost point to the low level, and MOS pipe V4 ends, and MOS pipe V4's D utmost point voltage of establishing the power supply simultaneously passes through resistance R6, triode V3 ground connection earial drainage. The stable output voltage module has no voltage input and stops supplying power to the load.
In this embodiment: referring to fig. 2 and fig. 3, the stable output voltage module includes a capacitor C3, a voltage stabilizer U1, and a capacitor C4, wherein an input terminal of the voltage stabilizer U1 is connected to one end of the capacitor C3 and the power down processing module, the other end of the capacitor C3 is grounded, a ground terminal of the voltage stabilizer U1 is grounded, an output terminal of the voltage stabilizer U1 is connected to one end of the capacitor C4, and the other end of the capacitor C4 is grounded.
The voltage stabilizer U1 stably outputs constant voltage, the model of the voltage stabilizer U1 selects the LM2976, the input-output voltage difference of the LM2937 under rated load is less than or equal to 0.6V and only 1/6-1/3 of the LM7805, the power consumption of the voltage stabilizer can be obviously reduced, and the power efficiency is improved.
The utility model discloses a theory of operation is: the mains supply module introduces 220V alternating current and outputs the alternating current to the voltage reduction rectification filtering module, the voltage reduction rectification filtering module converts the 220V alternating current into direct current, the power failure detection module detects whether power failure occurs, and the power failure processing module is conducted when the power failure does not occur; when the power failure occurs, the power failure processing module is stopped, the control circuit is grounded and powered off when the power failure processing module is powered off, and the stable output voltage module outputs stable voltage to supply to a load.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. A power supply circuit having a protection function, characterized in that:
the power supply circuit with a protection function includes:
the mains supply module is used for introducing 220V alternating current and outputting the alternating current to the voltage reduction rectification filtering module;
the voltage reduction, rectification and filtering module is used for converting 220V alternating current into direct current;
the power failure detection module is used for detecting whether power failure occurs or not, and when the power failure does not occur, the power failure processing module is conducted; when the power is off, the power-off processing module is cut off;
the power failure processing module is used for controlling the circuit to be grounded and powered off when the power failure occurs;
the stable output voltage module is used for outputting stable voltage to supply a load;
the mains supply module is connected with the voltage-reducing rectifying and filtering module, the voltage-reducing rectifying and filtering module is connected with the power failure detection module and the power failure processing module, the power failure detection module is connected with the power failure processing module, and the power failure processing module is connected with the stable output voltage module.
2. The power supply circuit with the protection function according to claim 1, wherein the step-down rectification filter module comprises a transformer W, a diode D1, a diode D2, a diode D3, a diode D4, a capacitor C1, an inductor L1, a resistor R1 and a resistor R2, an input end of the transformer W is connected with the mains supply module, one end of an output end of the transformer W is connected with an anode of the diode D1 and a cathode of the diode D3, the other end of the output end of the transformer W is connected with an anode of the diode D2 and a cathode of the diode D4, a cathode of the diode D1 is connected with a cathode of the diode D2, one end of the capacitor C1 and one end of the inductor L1, an anode of the diode D3 is connected with an anode of the diode D4, the other end of the capacitor C1 and one end of the resistor R1, the other end of the resistor R1 is connected with one end of the inductor L1 and one end of the resistor R2, and the other end of the resistor R2 is connected with the power failure detection module and the power failure processing module.
3. The power supply circuit with protection function according to claim 1, wherein the power failure detection module includes a diode D5, a resistor R3, a resistor R4, and a transistor V1, a negative electrode of the diode D5 is connected to one end of the resistor R4, and the buck rectifying and filtering module, a positive electrode of the diode D5 is connected to one end of the resistor R3 and a base electrode of the transistor V1, another end of the resistor R4 is connected to a collector of the transistor V1 and the power failure processing module, an emitter of the transistor V1 is grounded, and another end of the resistor R3 is grounded.
4. The power supply circuit with protection function according to claim 3, wherein the power down processing module comprises a resistor R5, a resistor R6, a MOS transistor V4, a capacitor C2, a transistor V2, and a transistor V3, wherein a base of the transistor V2 is connected to one end of the capacitor C2 and a collector of the transistor V1, another end of the capacitor C2 is grounded, an emitter of the transistor V2 is connected to a base of the transistor V3, an emitter of the transistor V3 is grounded, a collector of the transistor V2 is connected to a collector of the transistor V3, one end of the resistor R6, and a G pole of the MOS transistor V4, another end of the resistor R6 is connected to one end of the resistor R5 and a D pole of the MOS transistor V4, another end of the resistor R5 is connected to the buck rectifier and filter module, and an S pole of the MOS transistor V4 is connected to the stable output voltage module.
5. The power supply circuit with protection function of claim 1, wherein the module for stabilizing output voltage comprises a capacitor C3, a regulator U1 and a capacitor C4, wherein an input terminal of the regulator U1 is connected to one terminal of the capacitor C3 and the power down processing module, the other terminal of the capacitor C3 is grounded, a ground terminal of the regulator U1 is grounded, an output terminal of the regulator U1 is connected to one terminal of the capacitor C4, and the other terminal of the capacitor C4 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222673334.8U CN218771268U (en) | 2022-10-11 | 2022-10-11 | Power supply circuit with protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222673334.8U CN218771268U (en) | 2022-10-11 | 2022-10-11 | Power supply circuit with protection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218771268U true CN218771268U (en) | 2023-03-28 |
Family
ID=85698205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222673334.8U Active CN218771268U (en) | 2022-10-11 | 2022-10-11 | Power supply circuit with protection function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218771268U (en) |
-
2022
- 2022-10-11 CN CN202222673334.8U patent/CN218771268U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108075562B (en) | High-power portable electric equipment and power supply control device and method thereof | |
| CN113285425B (en) | Rectifier with protection function | |
| CN216751302U (en) | Interactive double-direct-current power supply switching device | |
| CN108199462B (en) | AC-DC conversion circuit | |
| CN218771268U (en) | Power supply circuit with protection function | |
| CN218352241U (en) | Intelligent charging energy-saving control circuit | |
| CN208352968U (en) | A kind of PFC overvoltage crowbar and device | |
| CN216564635U (en) | UPS power supply with power supply protection function | |
| CN112311220B (en) | PFC control circuit and power supply control device | |
| CN111384844A (en) | Power supply circuit for inhibiting instant starting-up impact current | |
| CN212210576U (en) | Power supply circuit of low-power-consumption storage battery charger | |
| CN218829620U (en) | Intelligent constant-voltage controller | |
| CN218243026U (en) | AC-DC hybrid micro-grid coordinated power supply circuit of intelligent building system | |
| CN215009718U (en) | Lead-acid battery charging protector | |
| CN209767224U (en) | Solar-based television power supply system | |
| CN216531104U (en) | Three-phase input low-voltage large-current high-frequency full-isolation bidirectional switch power supply | |
| CN219717927U (en) | Portable live broadcast equipment charging circuit | |
| CN214315079U (en) | Low-loss power supply circuit of integrated circuit chip | |
| CN217036762U (en) | Intelligent photovoltaic energy storage emergency power supply | |
| CN219678149U (en) | Solar energy and CT hybrid energy-taking low-power backup power supply circuit with MPPT | |
| CN217721024U (en) | Power supply circuit and display device | |
| CN215343992U (en) | Battery control circuit for electric meter | |
| CN217010724U (en) | High-efficiency conversion circuit of direct-current power supply | |
| CN214100958U (en) | Power supply switching circuit with filtering function | |
| CN208539788U (en) | A kind of driving power circuit of accumulation power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |