CN210297568U - Power supply switch circuit of visible intercom power supply for entrance guard - Google Patents
Power supply switch circuit of visible intercom power supply for entrance guard Download PDFInfo
- Publication number
- CN210297568U CN210297568U CN201921514764.7U CN201921514764U CN210297568U CN 210297568 U CN210297568 U CN 210297568U CN 201921514764 U CN201921514764 U CN 201921514764U CN 210297568 U CN210297568 U CN 210297568U
- Authority
- CN
- China
- Prior art keywords
- resistor
- capacitor
- pin
- anode
- grounded
- 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 visible intercommunication power supply switch circuit for entrance guard, a BD1 bridge rectifier is changed into a high-voltage direct current circuit through C1 filtering, an absorption clamping circuit is formed by R6R 7R 9R 10R 18C 2D 4, the switching tube Q1 is controlled to be switched on and off by a built-in high-frequency PWM (pulse width modulation) signal of the U1 IC chip, a D1D 2EC 2EC 3 forms a secondary IC chip power supply circuit, the starting time can be reduced, R29R 30R 31 is a current-limiting protection resistor, D5 EC4EC5 EC 6C 12 forms a secondary rectifying and filtering circuit, R26R 22 SVR1 forms an output voltage regulation circuit, U4U 2C 8R 21 and the like form a feedback circuit to control the primary PWM duty ratio, in order to achieve the purpose of stable output, the F2 is an automatic recovery fuse, and the L1L 2L 3 inductor is used for isolating the small alternating current signal, so that output current ripple is reduced, and interference are prevented.
Description
Technical Field
The utility model relates to an electron science and technical application technical field, concretely relates to visual intercommunication power supply switch circuit of entrance guard.
Background
With the rapid development of computer technology and modern communication technology, the intelligent door control building intercom system has been developed from common intercom to visual intercom and control of various types of electronic locks, the visual intercom function tends to be intelligent day by day, the requirements on the anti-interference performance of a power supply system and the like are more rigorous, and the stability of the power supply switch circuit of the existing door control visual intercom power supply is not high enough.
SUMMERY OF THE UTILITY MODEL
In view of this, in order to solve the above-mentioned problem in the prior art, the utility model provides a visual intercom power supply switch circuit of entrance guard.
The utility model discloses an above-mentioned problem is solved to following technical means:
a visible intercom power supply switch circuit for an entrance guard comprises a plug CN1, wherein a pin L of the plug CN1 is respectively connected with one end of a fuse F1 and one end of a capacitor CY7, the other end of the capacitor CY7 is connected with a pin PG of a plug CN1, the pin PG of the plug CN1 is grounded, the other end of the fuse F1 is respectively connected with one end of a piezoresistor MOV1 and one end of a piezoresistor RT1, the other end of the piezoresistor MOV1 is respectively connected with a pin N of the CN1 and one end of a capacitor CX1, one end of a resistor R3 and one end of a secondary winding of a transformer LF2, the other end of a piezoresistor RT1 are respectively connected with the other end of a capacitor CX1, one end of a resistor R2 and one end of a primary winding of a transformer LF2, the other end of a resistor R2 is connected with the other end of a resistor R3, the other end of the primary winding of the transformer LF2 is connected with one end of an alternating current input end of a rectifier bridge BD1, and the other end of the secondary winding of the transformer LF2 is connected with the other end of an alternating current input end of a rectifier bridge;
the negative electrode of the direct current output end of the rectifier bridge BD1 is grounded, the positive electrode of the direct current output end of the rectifier bridge BD1 is respectively connected with the positive electrode of the polarity capacitor C1, one end of the resistor R11, one end of the capacitor C2, one end of the resistor R6, one end of the resistor R7 and one end of the first secondary winding of the transformer T1, the other end of the first secondary winding of the transformer T1 is connected with the positive electrode of the diode D4, the negative electrode of the diode D4 is respectively connected with one end of the resistor R18, one end of the resistor R10 and one end of the resistor R9, the other end of the resistor R18 is respectively connected with the other end of the resistor R10, the other end of the capacitor C10, the other end of the resistor R10 is grounded, the negative electrode of the polarity capacitor C10 is connected with one end of the resistor R10, the other end of the resistor R10 is respectively connected with the pin 5 of the chip U10, the positive, the anode of the diode D2 is connected to the anode of the polar capacitor EC3 and the cathode of the diode D1, the cathode of the polar capacitor EC3 is grounded, the anode of the diode D1 is connected to one end of the second secondary winding of the transformer T1 and one end of the resistor R13, the other end of the second secondary winding of the transformer T1 is grounded, the other end of the resistor R13 is connected to one end of the resistor R14, the other end of the resistor R14 is connected to the pin 3 of the chip U1, the pin 1 of the chip U1 is grounded, the pin 6 of the chip U1 is connected to one end of the resistor R17, the other ends of the resistor R17 are connected to one end of the resistor R16 and the cathode of the diode D3, the anode of the diode D3 is connected to the other end of the resistor R3, the G of the N-channel enhancement type fet Q3 and one end of the resistor R3 are connected to the anode of the enhancement type fet Q3, the N-channel enhancement type fet Q3 is connected to the anode of the diode D3 and the cathode of, One end of a resistor R30, one end of a resistor R29 and one end of a resistor R15, the other end of the resistor R31 is connected with the other end of a resistor R30 and the other end of a resistor R29 respectively, the other end of the resistor R29 is grounded, the other end of the resistor R15 is connected with one end of a capacitor C6 and a pin 4 of a chip U1 respectively, the other end of the capacitor C6 is grounded, and the two ends of a capacitor CY3 are grounded;
a pin 2 of the chip U1 is respectively connected with one end of a capacitor C5 and the C pole of an optocoupler U2 light receiver, the other end of the capacitor C5 is connected with the E pole of an optocoupler U2 light receiver, the E pole of the optocoupler U2 light receiver is grounded, the anode of an optocoupler U2 light emitter is respectively connected with one end of a resistor R20 and the anode of a Zener diode ZD1, the other end of the resistor R20 is respectively connected with the cathode of the optocoupler U2 light emitter, one end of a capacitor C8 and the anode of a three-terminal adjustable voltage reference chip U4, the cathode of the three-terminal adjustable voltage reference chip U4 is grounded, and the three-terminal adjustableV of chip U4REFThe ends of the resistor R26 are respectively connected with one end of a resistor R22, one end of a resistor R26 and one end of a resistor R21, the other end of the resistor R22 is connected with one end of a potentiometer SVR1, the other end of the potentiometer SVR1 and the adjustable end of the potentiometer SVR1 are grounded, the other end of the resistor R21 is connected with the other end of a capacitor C8, the negative electrode of a zener diode ZD1 is connected with one end of the resistor R24, and the other end of the resistor R24 is connected with the other end of the resistor R26;
the other end of the resistor R26 is connected with one end of a resistor R37, one end of a fuse F2, one end of a capacitor C12, the anode of a polar capacitor EC6, the anode of a polar capacitor EC5, the anode of a polar capacitor EC4, one end of a resistor R19 and the cathode of a parallel diode D5 in the same direction, the anode of a parallel diode D5 is connected with one end of the primary winding of a transformer T1 and one end of a capacitor C7 respectively, the other end of a capacitor C7 is connected with the other end of a resistor R19, the other end of the primary winding of a transformer T1 is connected with the other end of a resistor R37, one end of a capacitor CY 37, one end of a coil L37, the other end of a capacitor C37, the cathode of a polar capacitor EC 37, the cathode of the polar capacitor EC 37 is connected with the ground, the other end of the capacitor CY 37 is connected with the ground, the other end of the pin CN2 of the pin 37 and the pin 364 of the pin CN 363, the pin 37 and the pin, the other end of coil L3 is connected to one end of resistor R36 and one end of coil L1, respectively, the other end of resistor R36 is connected to pin 3 of plug CN2, pin 2 of plug CN2 is grounded, and pin 1 of plug CN2 is connected to the other end of coil L1 and the other end of fuse F2, respectively.
Further, the model of the chip U1 is OB 2362.
Further, the model number of the optical coupler U2 is 817B.
Further, the model of the N-channel enhancement mode fet Q1 is SLF7N 65.
Further, the model of the three-terminal adjustable voltage reference chip U4 is AZ 431.
Compared with the prior art, the beneficial effects of the utility model include at least:
the utility model discloses visual power supply switch circuit of talkbacking of entrance guard is reliable, stable, anti-interference, can satisfy people to intelligent needs.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of the power supply switching circuit of the visual intercom power supply of entrance guard of the utility model.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments accompanying the drawings are described in detail below. It should be noted that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
Examples
As shown in fig. 1, the utility model provides a visual intercom power supply switch circuit of entrance guard, including plug CN1, plug CN 1's foot L connects the one end of fuse F1 respectively, the one end of electric capacity CY7, the other end of electric capacity CY7 connects pin PG of plug CN1, plug CN 1's foot PG ground connection, the one end of piezo-resistor MOV1, the one end of piezo-resistor RT1 are connected respectively to the other end of fuse F1, the foot N of CN1, the one end of electric capacity CX1 are connected respectively to the other end of piezo-resistor MOV1, one end of a resistor R3 and one end of a secondary winding of a transformer LF2, the other end of a piezoresistor RT1 are respectively connected with the other end of a capacitor CX1, one end of a resistor R2 and one end of a primary winding of a transformer LF2, the other end of a resistor R2 is connected with the other end of a resistor R3, the other end of the primary winding of the transformer LF2 is connected with one end of an alternating current input end of a rectifier bridge BD1, and the other end of the secondary winding of the transformer LF2 is connected with the other end of an alternating current input end of a rectifier bridge;
the negative electrode of the direct current output end of the rectifier bridge BD1 is grounded, the positive electrode of the direct current output end of the rectifier bridge BD1 is respectively connected with the positive electrode of the polarity capacitor C1, one end of the resistor R11, one end of the capacitor C2, one end of the resistor R6, one end of the resistor R7 and one end of the first secondary winding of the transformer T1, the other end of the first secondary winding of the transformer T1 is connected with the positive electrode of the diode D4, the negative electrode of the diode D4 is respectively connected with one end of the resistor R18, one end of the resistor R10 and one end of the resistor R9, the other end of the resistor R18 is respectively connected with the other end of the resistor R10, the other end of the capacitor C10, the other end of the resistor R10 is grounded, the negative electrode of the polarity capacitor C10 is connected with one end of the resistor R10, the other end of the resistor R10 is respectively connected with the pin 5 of the chip U10, the positive, the anode of the diode D2 is connected to the anode of the polar capacitor EC3 and the cathode of the diode D1, the cathode of the polar capacitor EC3 is grounded, the anode of the diode D1 is connected to one end of the second secondary winding of the transformer T1 and one end of the resistor R13, the other end of the second secondary winding of the transformer T1 is grounded, the other end of the resistor R13 is connected to one end of the resistor R14, the other end of the resistor R14 is connected to the pin 3 of the chip U1, the pin 1 of the chip U1 is grounded, the pin 6 of the chip U1 is connected to one end of the resistor R17, the other ends of the resistor R17 are connected to one end of the resistor R16 and the cathode of the diode D3, the anode of the diode D3 is connected to the other end of the resistor R3, the G of the N-channel enhancement type fet Q3 and one end of the resistor R3 are connected to the anode of the enhancement type fet Q3, the N-channel enhancement type fet Q3 is connected to the anode of the diode D3 and the cathode of, One end of a resistor R30, one end of a resistor R29 and one end of a resistor R15, the other end of the resistor R31 is connected with the other end of a resistor R30 and the other end of a resistor R29 respectively, the other end of the resistor R29 is grounded, the other end of the resistor R15 is connected with one end of a capacitor C6 and a pin 4 of a chip U1 respectively, the other end of the capacitor C6 is grounded, and the two ends of a capacitor CY3 are grounded;
the pin 2 of the chip U1 is respectively connected with one end of a capacitor C5 and the C pole of an optocoupler U2 light receiver, the other end of the capacitor C5 is connected with the E pole of an optocoupler U2 light receiver, the E pole of the optocoupler U2 light receiver is grounded, and light is emitted from the light sourceThe anode of the coupler U2 light emitter is respectively connected with one end of a resistor R20 and the anode of a voltage stabilizing diode ZD1, the other end of the resistor R20 is respectively connected with the cathode of the optocoupler U2 light emitter, one end of a capacitor C8 and the anode of a three-terminal adjustable voltage reference chip U4, the cathode of the three-terminal adjustable voltage reference chip U4 is grounded, and the V of the three-terminal adjustable voltage reference chip U4 is connected with the groundREFThe ends of the resistor R26 are respectively connected with one end of a resistor R22, one end of a resistor R26 and one end of a resistor R21, the other end of the resistor R22 is connected with one end of a potentiometer SVR1, the other end of the potentiometer SVR1 and the adjustable end of the potentiometer SVR1 are grounded, the other end of the resistor R21 is connected with the other end of a capacitor C8, the negative electrode of a zener diode ZD1 is connected with one end of the resistor R24, and the other end of the resistor R24 is connected with the other end of the resistor R26;
the other end of the resistor R26 is connected with one end of a resistor R37, one end of a fuse F2, one end of a capacitor C12, the anode of a polar capacitor EC6, the anode of a polar capacitor EC5, the anode of a polar capacitor EC4, one end of a resistor R19 and the cathode of a parallel diode D5 in the same direction, the anode of a parallel diode D5 is connected with one end of the primary winding of a transformer T1 and one end of a capacitor C7 respectively, the other end of a capacitor C7 is connected with the other end of a resistor R19, the other end of the primary winding of a transformer T1 is connected with the other end of a resistor R37, one end of a capacitor CY 37, one end of a coil L37, the other end of a capacitor C37, the cathode of a polar capacitor EC 37, the cathode of the polar capacitor EC 37 is connected with the ground, the other end of the capacitor CY 37 is connected with the ground, the other end of the pin CN2 of the pin 37 and the pin 364 of the pin CN 363, the pin 37 and the pin, the other end of coil L3 is connected to one end of resistor R36 and one end of coil L1, respectively, the other end of resistor R36 is connected to pin 3 of plug CN2, pin 2 of plug CN2 is grounded, and pin 1 of plug CN2 is connected to the other end of coil L1 and the other end of fuse F2, respectively.
Specifically, the model of the chip U1 is OB 2362.
Specifically, the model number of the optocoupler U2 is 817B.
Specifically, the model number of the N-channel enhancement mode fet Q1 is SLF7N 65.
Specifically, the three-terminal adjustable voltage reference chip U4 is of type AZ 431.
The utility model discloses in:
1. and (3) alternating current input: 100V-240V, direct current output: DC24-28V, standard output current 1.5A.
2. The overcurrent protection point can reach 4-5A current, and various electronic locks can be directly controlled.
3. Overcurrent, over (under) voltage, over temperature, overload and other protection functions.
4. And 3KV lightning stroke prevention.
A fuse F1 piezoresistor MOV1 thermistor NTC in the circuit is a circuit protection device, and an EMI filter is formed by a safety CX1 capacitor and an LF2 mode supply inductor to inhibit high-frequency interference and the like.
The working principle is as follows:
BD1 bridge rectifier is rectified and then becomes a high-voltage direct current circuit through C1 filtering, R6R 7R 9R 10R 18C 2D 4 constitutes an absorption clamping circuit, a high-frequency PWM (pulse width modulation) signal built in a U1 IC chip controls a switching tube Q1 to be switched on and off, D1D 2EC 2EC 3 constitutes a secondary IC chip power supply circuit, the starting time can be reduced, R29R 30R 31 is a current-limiting protection resistor, D5 EC4EC5 EC 6C 12 constitutes a secondary rectification filtering circuit, R26R 22 SVR1 constitutes an output voltage regulation circuit, U4U 2C 8R 21 and the like constitute a feedback circuit, the primary PWM duty ratio is controlled, the purpose of stable output is achieved, F2 is an automatic recovery fuse, and an L1L 2L 3 inductor constitutes AC small signal ripple isolation, the output current is reduced, interference resistance and anti-interference and anti-dry prevention are achieved.
Compared with the prior art, the beneficial effects of the utility model include at least:
the utility model discloses visual power supply switch circuit of talkbacking of entrance guard is reliable, stable, anti-interference, can satisfy people to intelligent needs.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (5)
1. A visible intercom power supply switch circuit for an entrance guard is characterized by comprising a plug CN1, wherein a pin L of the plug CN1 is respectively connected with one end of a fuse F1 and one end of a capacitor CY7, the other end of the capacitor CY7 is connected with a pin PG of a plug CN1, a pin PG of the plug CN1 is grounded, the other end of the fuse F1 is respectively connected with one end of a piezoresistor MOV1 and one end of a piezoresistor RT1, the other end of the piezoresistor MOV1 is respectively connected with a pin N of the CN1 and one end of the capacitor CX1, one end of a resistor R3 and one end of a secondary winding of a transformer LF2, the other end of a piezoresistor RT1 are respectively connected with the other end of a capacitor CX1, one end of a resistor R2 and one end of a primary winding of a transformer LF2, the other end of a resistor R2 is connected with the other end of a resistor R3, the other end of the primary winding of the transformer LF2 is connected with one end of an alternating current input end of a rectifier bridge BD1, and the other end of the secondary winding of the transformer LF2 is connected with the other end of an alternating current input end of a rectifier bridge;
the negative electrode of the direct current output end of the rectifier bridge BD1 is grounded, the positive electrode of the direct current output end of the rectifier bridge BD1 is respectively connected with the positive electrode of the polarity capacitor C1, one end of the resistor R11, one end of the capacitor C2, one end of the resistor R6, one end of the resistor R7 and one end of the first secondary winding of the transformer T1, the other end of the first secondary winding of the transformer T1 is connected with the positive electrode of the diode D4, the negative electrode of the diode D4 is respectively connected with one end of the resistor R18, one end of the resistor R10 and one end of the resistor R9, the other end of the resistor R18 is respectively connected with the other end of the resistor R10, the other end of the capacitor C10, the other end of the resistor R10 is grounded, the negative electrode of the polarity capacitor C10 is connected with one end of the resistor R10, the other end of the resistor R10 is respectively connected with the pin 5 of the chip U10, the positive, the anode of the diode D2 is connected to the anode of the polar capacitor EC3 and the cathode of the diode D1, the cathode of the polar capacitor EC3 is grounded, the anode of the diode D1 is connected to one end of the second secondary winding of the transformer T1 and one end of the resistor R13, the other end of the second secondary winding of the transformer T1 is grounded, the other end of the resistor R13 is connected to one end of the resistor R14, the other end of the resistor R14 is connected to the pin 3 of the chip U1, the pin 1 of the chip U1 is grounded, the pin 6 of the chip U1 is connected to one end of the resistor R17, the other ends of the resistor R17 are connected to one end of the resistor R16 and the cathode of the diode D3, the anode of the diode D3 is connected to the other end of the resistor R3, the G of the N-channel enhancement type fet Q3 and one end of the resistor R3 are connected to the anode of the enhancement type fet Q3, the N-channel enhancement type fet Q3 is connected to the anode of the diode D3 and the cathode of, One end of a resistor R30, one end of a resistor R29 and one end of a resistor R15, the other end of the resistor R31 is connected with the other end of a resistor R30 and the other end of a resistor R29 respectively, the other end of the resistor R29 is grounded, the other end of the resistor R15 is connected with one end of a capacitor C6 and a pin 4 of a chip U1 respectively, the other end of the capacitor C6 is grounded, and the two ends of a capacitor CY3 are grounded;
the pin 2 of the chip U1 is respectively connected with one end of a capacitor C5 and a C pole of an optocoupler U2 light receiver, the other end of the capacitor C5 is connected with an E pole of the optocoupler U2 light receiver, the E pole of the optocoupler U2 light receiver is grounded, the anode of the optocoupler U2 light emitter is respectively connected with one end of a resistor R20 and the anode of a voltage stabilizing diode ZD1, the other end of the resistor R20 is respectively connected with the cathode of the optocoupler U2 light emitter, one end of a capacitor C8 and the anode of a three-end adjustable voltage reference chip U4, the cathode of the three-end adjustable voltage reference chip U4 is grounded, and the V of the three-end adjustable voltage reference chipREFThe ends of the resistor R26 are respectively connected with one end of a resistor R22, one end of a resistor R26 and one end of a resistor R21, the other end of the resistor R22 is connected with one end of a potentiometer SVR1, the other end of the potentiometer SVR1 and the adjustable end of the potentiometer SVR1 are grounded, the other end of the resistor R21 is connected with the other end of a capacitor C8, the negative electrode of a zener diode ZD1 is connected with one end of the resistor R24, and the other end of the resistor R24 is connected with the other end of the resistor R26;
the other end of the resistor R26 is connected with one end of a resistor R37, one end of a fuse F2, one end of a capacitor C12, the anode of a polar capacitor EC6, the anode of a polar capacitor EC5, the anode of a polar capacitor EC4, one end of a resistor R19 and the cathode of a parallel diode D5 in the same direction, the anode of a parallel diode D5 is connected with one end of the primary winding of a transformer T1 and one end of a capacitor C7 respectively, the other end of a capacitor C7 is connected with the other end of a resistor R19, the other end of the primary winding of a transformer T1 is connected with the other end of a resistor R37, one end of a capacitor CY 37, one end of a coil L37, the other end of a capacitor C37, the cathode of a polar capacitor EC 37, the cathode of the polar capacitor EC 37 is connected with the ground, the other end of the capacitor CY 37 is connected with the ground, the other end of the pin CN2 of the pin 37 and the pin 364 of the pin CN 363, the pin 37 and the pin, the other end of coil L3 is connected to one end of resistor R36 and one end of coil L1, respectively, the other end of resistor R36 is connected to pin 3 of plug CN2, pin 2 of plug CN2 is grounded, and pin 1 of plug CN2 is connected to the other end of coil L1 and the other end of fuse F2, respectively.
2. The door control video intercom power supply switching circuit as claimed in claim 1, wherein the chip U1 is OB2362 in model number.
3. The door control video intercom power supply switching circuit as claimed in claim 1, wherein the model number of the optocoupler U2 is 817B.
4. The door control video intercom power supply switching circuit as claimed in claim 1, wherein the model of the N-channel enhancement type field effect transistor Q1 is SLF7N 65.
5. The door control video intercom power supply switching circuit as claimed in claim 1, wherein the three-terminal adjustable voltage reference chip U4 is AZ 431.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921514764.7U CN210297568U (en) | 2019-09-11 | 2019-09-11 | Power supply switch circuit of visible intercom power supply for entrance guard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921514764.7U CN210297568U (en) | 2019-09-11 | 2019-09-11 | Power supply switch circuit of visible intercom power supply for entrance guard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210297568U true CN210297568U (en) | 2020-04-10 |
Family
ID=70064591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921514764.7U Active CN210297568U (en) | 2019-09-11 | 2019-09-11 | Power supply switch circuit of visible intercom power supply for entrance guard |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210297568U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113985771A (en) * | 2021-10-25 | 2022-01-28 | 华能澜沧江水电股份有限公司 | Rolling slats door control system of total powerstation observation station |
-
2019
- 2019-09-11 CN CN201921514764.7U patent/CN210297568U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113985771A (en) * | 2021-10-25 | 2022-01-28 | 华能澜沧江水电股份有限公司 | Rolling slats door control system of total powerstation observation station |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110166721B (en) | Staggered PFC (Power factor correction) constant-current direct drive circuit, driving power supply and television | |
| CN210297568U (en) | Power supply switch circuit of visible intercom power supply for entrance guard | |
| WO2019001216A1 (en) | Active clamping forward switch power supply circuit | |
| CN210201485U (en) | Single-live-wire power taking circuit, control circuit and power supply system | |
| CN110881232A (en) | Flyback switching power supply circuit | |
| CN213547366U (en) | Circuit for effectively inhibiting EMI (electro-magnetic interference) of switching power supply | |
| CN214205901U (en) | Primary side feedback LED drive circuit and power supply for reducing output voltage no-load value | |
| CN112888109B (en) | LED driving switch power supply circuit with high PF and low THD | |
| CN114678830A (en) | Low-power-consumption dimming circuit and power supply method thereof | |
| CN115603552A (en) | Flyback switching power supply AC-DC conversion circuit | |
| CN211457010U (en) | High-temperature-resistant AC-DC power supply | |
| CN114460883A (en) | OCC driver with voltage dynamically and controllably adjusted based on double-loop control | |
| CN210608949U (en) | Voltage transformation rectifying circuit and charger | |
| CN210579329U (en) | LED lamp and power supply control module thereof | |
| CN209593816U (en) | Linear voltage-stabilizing circuit and regulated power supply system | |
| CN208539799U (en) | A kind of AC conversion circuit based on experiment instruments used for education | |
| CN215529389U (en) | EMI isolation dimming power supply | |
| CN110972365A (en) | Silicon controlled rectifier circuit based on high-efficiency off-line LED dimming | |
| CN216312963U (en) | Switching power supply with wide-range output voltage | |
| CN111491423A (en) | Single-fire switch circuit and single-fire switch device | |
| CN219499229U (en) | GaN-based power adapter circuit | |
| CN217063555U (en) | Switch power supply with overvoltage protection | |
| CN217445242U (en) | Power adapter for reducing common-mode inductance | |
| CN219181405U (en) | Electrical switching power supply device | |
| CN215344400U (en) | Ultra-low voltage power supply circuit for network monitoring equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |