CN216390808U - Constant voltage and constant current switch power supply - Google Patents
Constant voltage and constant current switch power supply Download PDFInfo
- Publication number
- CN216390808U CN216390808U CN202122196715.7U CN202122196715U CN216390808U CN 216390808 U CN216390808 U CN 216390808U CN 202122196715 U CN202122196715 U CN 202122196715U CN 216390808 U CN216390808 U CN 216390808U
- Authority
- CN
- China
- Prior art keywords
- resistor
- chip
- constant
- pin
- power supply
- 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
Abstract
The utility model relates to a constant-voltage and constant-current switching power supply, which comprises a power supply primary module, a direct-current stabilized power supply module and a constant-voltage and constant-current circulating lamp control module, wherein the direct-current stabilized power supply module comprises a transformer, a main control circuit and a secondary rectifying and filtering circuit, and the power supply primary module, the transformer and the secondary rectifying and filtering circuit are sequentially connected; the main control circuit is connected with the primary winding of the transformer on one hand and the constant-voltage constant-current rotary lamp control module on the other hand; the constant-voltage constant-current circulating lamp control module is connected with the secondary rectifying and filtering circuit; the constant-voltage constant-current rotary lamp control module comprises a chip IC2, an indicator lamp LED1, an indicator lamp LED2, an optical coupler PH1, an optical coupler filter circuit, a pull-up resistor R16, a pull-down resistor RA1, a resistor R14, a resistor R15, a resistor R22, a capacitor C8 and a capacitor C9. The utility model integrates the constant voltage and constant current control circuit and the lamp-turning control circuit, and the functions of the two circuits can be realized by one control chip, thereby simplifying the circuit of the circuit board and improving the operating efficiency of the switching power supply.
Description
Technical Field
The utility model relates to the technical field of switching power supplies, in particular to a constant-voltage constant-current switching power supply.
Background
The switching power supply is also called a power adapter, is used for charging batteries or supplying power to electrical appliances, is one of the most common electronic devices in daily life, and has great significance for power utilization safety due to stability and reliability of the switching power supply. At present, apart from the switching power supply for mobile phones, most of the switching power supply is provided with a lamp turning circuit, and the switching power supply is also provided with a necessary output voltage constant current circuit and the like, and the circuits are mostly controlled by independent chips so as to ensure the reliability of power supply conversion, but the problems of more components and complicated wiring of the whole circuit board are caused, and the EMI and EMC performance of the circuit board is difficult to improve.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, an object of the present invention is to provide a constant voltage and constant current switching power supply, which can integrate a lamp switching circuit and a control chip of an output voltage and constant current circuit, reduce the number of components and simplify the circuit board, thereby reducing the product cost and improving the efficiency.
In order to achieve the aim, the utility model discloses a constant-voltage and constant-current switching power supply which comprises a power supply primary module, a direct-current stabilized power supply module and a constant-voltage and constant-current transfer lamp control module, wherein the direct-current stabilized power supply module comprises a transformer, a main control circuit and a secondary rectifying and filtering circuit, and the power supply primary module, the transformer and the secondary rectifying and filtering circuit are sequentially connected; the main control circuit is connected with a primary winding of the transformer on one hand and is connected with the constant-voltage constant-current rotary lamp control module on the other hand; the constant-voltage constant-current circulating lamp control module is connected with the secondary rectifying and filtering circuit;
the constant-voltage constant-current rotary lamp control module comprises a chip IC2, an indicator lamp LED1, an indicator lamp LED2, an optical coupler PH1, an optical coupler filter circuit, a pull-up resistor R16, a pull-down resistor RA1, a resistor R14, a resistor R15, a resistor R22, a capacitor C8 and a capacitor C9; the RED pin and the G pin of the chip IC2 are respectively connected with the output positive electrode of the secondary rectifying and filtering circuit through an indicator light LED1 and an indicator light LED 2; an OUT pin of the chip IC2 is connected with a cathode of the optocoupler PH1, a cathode of the optocoupler PH1 is connected with a VCT pin of the chip IC2 through an optocoupler filter circuit on one hand, and is connected with a VE pin of the chip IC2 and an output negative electrode of the secondary rectifying filter circuit after being connected with a resistor R15 and a capacitor C9 in series on the other hand, and an anode of the optocoupler PH1 is connected with an output positive electrode of the secondary rectifying filter circuit; the VCT pin of the chip IC2 is connected with the secondary output positive of the direct current stabilized power supply module through a pull-up resistor R16 on one hand, and is connected with the ground through a pull-down resistor RA1 on the other hand; the ICTR1L pin of the chip IC2 is grounded through a resistor R22; the VCC pin of the chip IC2 is connected to the positive electrode of the output of the secondary rectifying and filtering circuit on one hand, and is connected to the ground through the capacitor C8 on the other hand.
Preferably, the optical coupling filter circuit comprises a resistor R19, a capacitor C6 and a capacitor C7; one end of the resistor R19 is connected with one end of the capacitor C6 and then connected with the cathode of the light emitting diode of the optocoupler PH1, and the other end of the resistor R19 is connected with the other end of the capacitor C6 and the VCT pin of the chip IC2 after passing through the capacitor C7.
Preferably, the anode of the optocoupler PH1 is connected with the output anode of the secondary rectifying and filtering circuit through a resistor RA 2; the anode and the cathode of the optocoupler PH1 are also connected with two ends of the resistor R14 respectively; indicator LED1 and indicator LED2 connect the RED foot and the G foot of chip IC2 through resistance R20 and resistance R20A respectively, and indicator LED1 connects earlier with the positive pole of output of indicator LED2 and then connects the secondary rectifier and filter circuit behind resistance R26 and resistance R24, the VCC foot of chip IC2 connects the output positive pole of secondary rectifier and filter circuit behind resistance R24, the VE foot of chip IC2 connects the output negative pole of secondary rectifier and filter circuit through resistance R21.
Preferably, the output negative electrode of the secondary rectifying and filtering circuit is connected in series with a sampling resistor RA6, and the VE pin of the chip IC2 is connected with one end of the sampling resistor RA6 far away from the secondary winding of the transformer TR 1.
Preferably, the model number of the chip IC2 is ME 4312.
Preferably, the main control circuit comprises a chip IC1, a sampling resistor RA3, a resistor RA4, a resistor RA5, a resistor R5, a resistor R5A, a capacitor C3, an electrolytic capacitor EC3, a diode D5, a voltage regulator tube ZD1 and a voltage regulator tube ZD 2; the SW pin of the chip IC1 is connected with one end of a resistor RA4 and the primary winding power outlet end of the transformer TR1, and the other end of the resistor RA4 is grounded; the CS pin of the chip IC1 is grounded with the GND pin of the chip IC1 after passing through the sampling resistor RA 3; a VDD pin of the chip IC1 is connected with a resistor R5, a cathode of a voltage regulator tube ZD1, an anode of an electrolytic capacitor EC3 and one end of a capacitor C3, and an anode of a voltage regulator tube ZD1, a cathode of an electrolytic capacitor EC3 and the other end of the capacitor C3 are grounded; the other end of the resistor R5 is connected with the cathode of the diode D5, and the anode of the diode D5 is grounded through the auxiliary winding of the transformer TR 1; the COM pin of the chip IC1 is connected with one end of a resistor RA4, the cathode of a voltage regulator tube ZD2 and one end of a resistor R5A, the other end of the resistor R5A is connected with the collector of the optical coupler PH1, and the other end of the resistor RA5 is grounded with the anode of the voltage regulator tube ZD2 and the emitter of the resistor R5 reaching the PH 1.
Preferably, the model of the chip IC1 is PN 8149.
Preferably, the secondary rectifying and filtering circuit comprises a synchronous rectifying circuit, and the synchronous rectifying circuit comprises a chip IC3, a resistor R6, a capacitor C4 and a capacitor C5; the SW pin of the chip IC3 is grounded with the output cathode of the secondary winding of the transformer TR1, the VCC pin of the chip IC3 is connected with the output anode of the secondary winding of the transformer TR1, the GND1 pin and the GND2 pin of the chip IC3 are directly grounded on one hand, and on the other hand, the GND1 pin and the GND2 pin are connected with the output cathode of the secondary winding of the transformer TR1 through a resistor R6 and a capacitor C4; the GND3 pin of the chip IC3 is grounded via the capacitor C5.
Preferably, the power supply primary module comprises an AC alternating current input circuit, a rectifying circuit and a pi-type filter circuit which are connected in sequence.
Preferably, the power supply further comprises a secondary filter connected in parallel after the secondary rectifying and filtering circuit, and the output power of the secondary rectifying and filtering circuit is input to the load through the secondary filter.
The utility model has the following beneficial effects:
according to the utility model, the constant-voltage constant-current control circuit and the rotary lamp control circuit on the secondary side of the switching power supply are integrated into a constant-voltage constant-current control module, and the functions of the two circuits can be realized through one control chip, so that the circuit of the circuit board is simplified, the electromagnetic compatibility problems of conduction radiation and the like caused by wiring are reduced, and the operation efficiency of the switching power supply can be improved. In addition, the reduced component usage also reduces product cost.
Drawings
FIG. 1 is a schematic diagram of the present invention.
Fig. 2 is a schematic diagram of a power supply primary module and transformer.
FIG. 3 is a schematic diagram of a master control circuit.
Fig. 4 is a schematic diagram of a secondary rectifying-filtering circuit.
Fig. 5 is a schematic diagram of a constant voltage and constant current lamp-rotating module.
Description of the main part symbols:
the power supply comprises a power supply primary module 10, an AC input circuit 11, a rectifying circuit 12 and a pi-shaped filter circuit 13;
an RCD absorption circuit 21, a main control circuit 22, a secondary rectification filter circuit 23 and a synchronous rectification circuit 231;
constant voltage constant current lamp control module 30, optical coupling filter circuit 31.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.
As shown in fig. 1 to 5, the present invention discloses a constant voltage and constant current switching power supply, which includes a power supply primary module 10, a dc regulated power supply module and a constant voltage and constant current lamp control module 30, wherein the dc regulated power supply module includes a transformer TR1, a main control circuit 22 and a secondary rectification filter circuit 23. The power supply primary module 10, the transformer and the secondary rectifying and filtering circuit 23 are connected in sequence. The main control circuit 22 is connected to the primary winding of the transformer, and is connected to the constant voltage and constant current lamp control module 30, and the constant voltage and constant current lamp control module 30 is further connected to the secondary rectifying and filtering circuit 23, so as to form a closed-loop negative feedback circuit, which is beneficial to constant voltage and constant current control.
The power supply primary module 10 comprises an AC input circuit 11, a rectifying circuit 12 and a pi-type filter circuit 13 which are connected in sequence. In the AC input circuit 11, L, N is connected to the mains supply, and overcurrent surge protection is performed through a fuse F1 and a varistor VR1, and then the overcurrent surge protection is converted into pulsating dc output through rectification by a rectification circuit 12 (a rectifier bridge BR1), and then the smooth dc output is obtained through a pi-type filter circuit 13 composed of an electrolytic capacitor EC1/EC2, an inductor L1, a resistor R1 and a filter LF1, and at the same time, the pi-type filter circuit 13 can improve the overall EMI performance. The smooth direct current is input into the transformer TR1, energy is coupled to the secondary side under the control of the main control circuit 22, in order to prevent the built-in MOS tube avalanche breakdown of the chip IC1 of the main control circuit 22 caused by the peak voltage generated by the leakage inductance of the transformer TR1, an RCD absorption circuit 21 is connected in parallel to the primary winding of the transformer TR1, the RCD absorption circuit 21 is composed of a resistor R2/R3, a capacitor C1 and a diode D1, and meanwhile, the RCD absorption circuit 21 also has the effect of improving the circuit EMC.
The main control circuit 22 comprises a chip IC1, a sampling resistor RA3 (formed by connecting a resistor R4, a resistor R4A and a resistor R4B in parallel), a resistor RA4, a resistor RA5, a resistor R5, a resistor R5A, a capacitor C3, an electrolytic capacitor EC3, a diode D5, a voltage regulator tube ZD1 and a voltage regulator tube ZD2, wherein the model of the chip IC1 is PN8149 in the scheme. The SW pin of the chip IC1 is connected with one end of a resistor RA4 and the primary winding power outlet end of the transformer TR1, and the other end of the resistor RA4 is grounded; the CS pin of the chip IC1 is grounded with the GND pin of the chip IC1 after passing through the sampling resistor RA 3; a VDD pin of the chip IC1 is connected with a resistor R5, a cathode of a voltage regulator tube ZD1, an anode of an electrolytic capacitor EC3 and one end of a capacitor C3, and an anode of a voltage regulator tube ZD1, a cathode of an electrolytic capacitor EC3 and the other end of the capacitor C3 are grounded; the other end of the resistor R5 is connected with the cathode of the diode D5, and the anode of the diode D5 is grounded through the auxiliary winding of the transformer TR 1; the COM pin of the chip IC1 is connected with one end of a resistor RA4, the cathode of a voltage regulator tube ZD2 and one end of a resistor R5A, the other end of the resistor R5A is connected with the collector of the optical coupler PH1, and the other end of the resistor RA5 is grounded with the anode of the voltage regulator tube ZD2 and the emitter of the resistor R5 reaching the PH 1.
The secondary rectifying and smoothing circuit 23 comprises a synchronous rectifying circuit 231 and a secondary smoothing circuit, a secondary filter LF2 is connected in parallel behind the secondary smoothing circuit, the output power of the secondary rectifying and smoothing circuit 23 is finally input to the load through a secondary filter LF2, and the EMC and EMI performance of the switching power supply can be well improved through the filter LF1/LF 2. The synchronous rectification circuit 231 comprises a chip IC3, a resistor R6, a capacitor C4 and a capacitor C5, and the chip IC3 is a synchronous rectification chip of LN5S21B, so that the efficiency is high, the speed is high, and the overall operation efficiency of the circuit can be improved. The SW pin of the chip IC3 is grounded with the output cathode of the secondary winding of the transformer TR1, the VCC pin of the chip IC3 is connected with the output anode of the secondary winding of the transformer TR1, the GND1 pin and the GND2 pin of the chip IC3 are directly grounded on one hand, and on the other hand, the GND1 pin and the GND2 pin are connected with the output cathode of the secondary winding of the transformer TR1 through a resistor R6 and a capacitor C4; the GND3 pin of the chip IC3 is grounded via the capacitor C5. The resistor R6 and the capacitor C4 form a secondary absorption circuit, which can improve the peak value at both ends of the synchronous rectification circuit 231, thereby improving the EMC characteristics of the circuit. The secondary filter circuit is composed of electrolytic capacitors EC4/EC5/EC6 and the like.
The constant-voltage constant-current lamp control module 30 mainly comprises a chip IC2, an indicator lamp LED1, an indicator lamp LED2, an optical coupler PH1, an optical coupler filter circuit 31, a pull-up resistor R16, a pull-down resistor RA1 (formed by connecting a resistor R17 and a resistor R18 in parallel), a resistor R14, a resistor R15, a resistor R22, a capacitor C8 and a capacitor C9, and the model of the chip IC2 is ME 4312.
The RED pin and the G pin of the chip IC2 are connected to the cathode of the indicator LED1 and the cathode of the indicator LED2 through the resistor R20 and the resistor R20A, respectively, and the anode of the indicator LED1 and the anode of the indicator LED2 are connected to the output anode of the secondary rectifying and filtering circuit 23 through the resistor R26 and the resistor R24. The OUT pin of the chip IC2 is connected with the cathode of the optical coupler PH1, the cathode of the optical coupler PH1 is connected with the VCT pin of the chip IC2 through the optical coupler filter circuit 31 on the one hand, on the other hand, the series resistor R15 and the capacitor C9 are connected with the VE pin of the chip IC2, the VE pin of the chip IC2 is also connected with the output cathode of the secondary rectifier filter circuit 23 through the resistor R21, specifically, the sampling resistor RA6 (formed by connecting the resistor R0, the resistor R0 VE 0A and the resistor R0 VE 0B in parallel) is connected in series on the output cathode of the secondary rectifier filter circuit 23, and the pin of the chip IC2 is connected with one end of the sampling resistor RA6 far away from the secondary winding of the transformer TR 1. The anode of the optocoupler PH1 is connected with the output anode of the secondary rectifying and filtering circuit 23 through a resistor RA2 (formed by connecting a resistor R13 and a resistor R25 in parallel), and the anode and the cathode of the optocoupler PH1 are also connected with two ends of a resistor R14 respectively. The VCT pin of the chip IC2 is connected with the secondary output positive of the DC stabilized power supply module through a pull-up resistor R16 on one hand, and is connected with the ground through a pull-down resistor RA1 on the other hand. The ICTR1L pin of the chip IC2 is grounded through a resistor R22. The VCC pin of the chip IC2 is connected to the positive output terminal of the secondary rectifying-filtering circuit 23, and to ground via the capacitor C8.
The optical coupling filter circuit 31 comprises a resistor R19, a capacitor C6 and a capacitor C7. One end of the resistor R19 is connected with one end of the capacitor C6 and then connected with the cathode of the light emitting diode of the optocoupler PH1, and the other end of the resistor R19 is connected with the other end of the capacitor C6 and the VCT pin of the chip IC2 after passing through the capacitor C7.
The RED pin of the chip IC2 is a charging indication RED light, and the G pin of the chip IC2 is a charging indication green light. The resistor R20/R20A/R26 is a current-limiting resistor and is used for prolonging the service life of the LED lamp. The ICTRL pin of the chip IC2 is used as an input pin current control loop, and the current is debugged and the rotary lamp is detected through a resistor R22. The VCC pin of chip IC2 is the power supply terminal of chip IC 2. The VE pin of the chip IC2 controls the output constant current point by detecting the voltage of the current limiting resistor R0B/R0A/R0/R21 and comparing the voltage with the internal reference voltage, namely, the constant current value can be set by changing the value of the resistor R0B/R0A/R0/R21. The VCT pin of the chip IC2 is used to set the voltage of the OUT pin of the chip IC2, and the output voltage of the OUT pin of the chip IC2 can be set through the pull-up resistor R16 and the pull-down resistor RA 1. The OUT pin of the chip IC2 is used for outputting the set voltage of the chip IC2, a feedback network is formed by the OUT pin and the optical coupler PH1, the output voltage of the switching power supply is stabilized, and the output voltage of the switching power supply is the same as that of the OUT pin at the moment.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. A constant voltage constant current switching power supply is characterized in that: the direct current stabilized power supply comprises a transformer, a main control circuit and a secondary rectification filter circuit, wherein the primary power supply module, the transformer and the secondary rectification filter circuit are sequentially connected; the main control circuit is connected with a primary winding of the transformer on one hand and is connected with the constant-voltage constant-current rotary lamp control module on the other hand; the constant-voltage constant-current circulating lamp control module is connected with the secondary rectifying and filtering circuit;
the constant-voltage constant-current rotary lamp control module comprises a chip IC2, an indicator lamp LED1, an indicator lamp LED2, an optical coupler PH1, an optical coupler filter circuit, a pull-up resistor R16, a pull-down resistor RA1, a resistor R14, a resistor R15, a resistor R22, a capacitor C8 and a capacitor C9; the RED pin and the G pin of the chip IC2 are respectively connected with the output positive electrode of the secondary rectifying and filtering circuit through an indicator light LED1 and an indicator light LED 2; an OUT pin of the chip IC2 is connected with a cathode of the optocoupler PH1, a cathode of the optocoupler PH1 is connected with a VCT pin of the chip IC2 through an optocoupler filter circuit on one hand, and is connected with a VE pin of the chip IC2 and an output negative electrode of the secondary rectifying filter circuit after being connected with a resistor R15 and a capacitor C9 in series on the other hand, and an anode of the optocoupler PH1 is connected with an output positive electrode of the secondary rectifying filter circuit; the VCT pin of the chip IC2 is connected with the secondary output positive of the direct current stabilized power supply module through a pull-up resistor R16 on one hand, and is connected with the ground through a pull-down resistor RA1 on the other hand; the ICTR1L pin of the chip IC2 is grounded through a resistor R22; the VCC pin of the chip IC2 is connected to the positive electrode of the output of the secondary rectifying and filtering circuit on one hand, and is connected to the ground through the capacitor C8 on the other hand.
2. The constant-voltage constant-current switching power supply according to claim 1, characterized in that: the optical coupling filter circuit comprises a resistor R19, a capacitor C6 and a capacitor C7; one end of the resistor R19 is connected with one end of the capacitor C6 and then connected with the cathode of the light emitting diode of the optocoupler PH1, and the other end of the resistor R19 is connected with the other end of the capacitor C6 and the VCT pin of the chip IC2 after passing through the capacitor C7.
3. The constant-voltage constant-current switching power supply according to claim 1, characterized in that: the anode of the optocoupler PH1 is connected with the output anode of the secondary rectifying and filtering circuit through a resistor RA 2; the anode and the cathode of the optocoupler PH1 are also connected with two ends of the resistor R14 respectively; indicator LED1 and indicator LED2 connect the RED foot and the G foot of chip IC2 through resistance R20 and resistance R20A respectively, and indicator LED1 connects earlier with the positive pole of output of indicator LED2 and then connects the secondary rectifier and filter circuit behind resistance R26 and resistance R24, the VCC foot of chip IC2 connects the output positive pole of secondary rectifier and filter circuit behind resistance R24, the VE foot of chip IC2 connects the output negative pole of secondary rectifier and filter circuit through resistance R21.
4. The constant-voltage constant-current switching power supply according to claim 1, characterized in that: the output negative pole of the secondary rectifying and filtering circuit is connected with a sampling resistor RA6 in series, and the VE pin of the chip IC2 is connected with one end of the sampling resistor RA6 far away from the secondary winding of the transformer TR 1.
5. The constant-voltage constant-current switching power supply according to claim 1, characterized in that: the model number of the chip IC2 is ME 4312.
6. The constant-voltage constant-current switching power supply according to claim 1, characterized in that: the main control circuit comprises a chip IC1, a sampling resistor RA3, a resistor RA4, a resistor RA5, a resistor R5, a resistor R5A, a capacitor C3, an electrolytic capacitor EC3, a diode D5, a voltage regulator tube ZD1 and a voltage regulator tube ZD 2; the SW pin of the chip IC1 is connected with one end of a resistor RA4 and the primary winding power outlet end of the transformer TR1, and the other end of the resistor RA4 is grounded; the CS pin of the chip IC1 is grounded with the GND pin of the chip IC1 after passing through the sampling resistor RA 3; a VDD pin of the chip IC1 is connected with a resistor R5, a cathode of a voltage regulator tube ZD1, an anode of an electrolytic capacitor EC3 and one end of a capacitor C3, and an anode of a voltage regulator tube ZD1, a cathode of an electrolytic capacitor EC3 and the other end of the capacitor C3 are grounded; the other end of the resistor R5 is connected with the cathode of the diode D5, and the anode of the diode D5 is grounded through the auxiliary winding of the transformer TR 1; the COM pin of the chip IC1 is connected with one end of a resistor RA4, the cathode of a voltage regulator tube ZD2 and one end of a resistor R5A, the other end of the resistor R5A is connected with the collector of the optical coupler PH1, and the other end of the resistor RA5 is grounded with the anode of the voltage regulator tube ZD2 and the emitter of the resistor R5 reaching the PH 1.
7. The constant-voltage constant-current switching power supply according to claim 6, wherein: the model of the chip IC1 is PN 8149.
8. The constant-voltage constant-current switching power supply according to claim 1, characterized in that: the secondary rectifying and filtering circuit comprises a synchronous rectifying circuit, and the synchronous rectifying circuit comprises a chip IC3, a resistor R6, a capacitor C4 and a capacitor C5; the SW pin of the chip IC3 is grounded with the output cathode of the secondary winding of the transformer TR1, the VCC pin of the chip IC3 is connected with the output anode of the secondary winding of the transformer TR1, the GND1 pin and the GND2 pin of the chip IC3 are directly grounded on one hand, and on the other hand, the GND1 pin and the GND2 pin are connected with the output cathode of the secondary winding of the transformer TR1 through a resistor R6 and a capacitor C4; the GND3 pin of the chip IC3 is grounded via the capacitor C5.
9. The constant-voltage constant-current switching power supply according to claim 1, characterized in that: the power supply primary module comprises an AC input circuit, a rectifying circuit and a pi-shaped filter circuit which are sequentially connected.
10. The constant-voltage constant-current switching power supply according to claim 1, characterized in that: the secondary filter is connected in parallel behind the secondary rectifying and filtering circuit, and the output power of the secondary rectifying and filtering circuit is input to the load through the secondary filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122196715.7U CN216390808U (en) | 2021-09-10 | 2021-09-10 | Constant voltage and constant current switch power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122196715.7U CN216390808U (en) | 2021-09-10 | 2021-09-10 | Constant voltage and constant current switch power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216390808U true CN216390808U (en) | 2022-04-26 |
Family
ID=81240891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122196715.7U Active CN216390808U (en) | 2021-09-10 | 2021-09-10 | Constant voltage and constant current switch power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216390808U (en) |
-
2021
- 2021-09-10 CN CN202122196715.7U patent/CN216390808U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101227779B (en) | Insulation type general use illumination LED driving circuit | |
| CN201986215U (en) | High-power light emitting diode (LED) isolation type driving power supply | |
| CN111509825A (en) | 45W broadband voltage self-adaptation PPS super portable power source structure that fills soon | |
| CN201986238U (en) | Light-emitting diode (LED) lamp tube driver | |
| CN201174804Y (en) | Separation type general illuminating LED driving circuit | |
| CN110912415A (en) | Low-power-consumption isolated output household power supply | |
| CN109347316A (en) | A kind of switching power circuit module of auto sleep | |
| CN212849939U (en) | A charger | |
| CN104426377B (en) | Wide-input voltage flyback-type switch power supply applicable to drive of direct-current motor | |
| CN216390808U (en) | Constant voltage and constant current switch power supply | |
| CN202524616U (en) | Off-line constant current driver for high-power LED energy-saving lamp | |
| CN211267175U (en) | Emergency LED lamp circuit capable of being charged in light-off state | |
| CN104953863A (en) | Switching power circuit for power supply of three-phase electric energy meter | |
| CN102810986B (en) | A kind of series topology LED switch power circuit | |
| CN209233112U (en) | A kind of digital camera power supply adaptor | |
| CN203632943U (en) | LED energy storage driving system with reusable AC-DC converter | |
| CN217037504U (en) | LED dimming circuit and dimming LED lamp | |
| CN211267181U (en) | LED lamp circuit with emergency lighting function | |
| CN208337146U (en) | Switching Power Supply overloads delay protection circuit | |
| CN208924105U (en) | A kind of switching power circuit module of auto sleep | |
| CN203457054U (en) | Wide input voltage flyback switching power supply suitable for DC motor driving | |
| CN111277017A (en) | Lithium battery quick charging circuit and application thereof | |
| CN112104022A (en) | CT power supply | |
| CN206775206U (en) | Mains charger circuit | |
| CN109347319A (en) | Efficient filtering circuit and power supply output system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |