CN214069811U

CN214069811U - Communication power supply circuit

Info

Publication number: CN214069811U
Application number: CN202120126949.1U
Authority: CN
Inventors: 王刚; 张枝兵
Original assignee: Shenzhen Gang Cheung Fair Electronics Co ltd
Current assignee: Shenzhen Gang Cheung Fair Electronics Co ltd
Priority date: 2021-01-18
Filing date: 2021-01-18
Publication date: 2021-08-27
Anticipated expiration: 2031-01-18

Abstract

The utility model provides a communication power supply circuit, including current fuse F1, MOV101, FR101, CX101, LF101, bridge rectifier BD101, resistance R1, resistance R2, resistance R3, resistance R4, electric capacity C101, electric capacity C110, transformer T102, resistance R119, resistance R118, IC101, resistance R112, resistance R113, diode D102, resistance R120, electric capacity C102, resistance R59, electric capacity C103, resistance R8, electric capacity C5, diode D2, resistance R6, resistance R7, electric capacity C3, main control chip U1, electric capacity C1; the power grid L line is firstly connected with one end of an MOV101 and an input end of an FR101 after passing through a current fuse F1, an output end of the FR101 is connected with one end of a CX101 and then connected with an input end of an LF101, an output end of the LF101 is connected with an input end of a bridge stack BD101, a main control chip G5138PL digital chip is stable in performance and good in consistency, an IW7707C synchronous rectification scheme is adopted in a secondary stage, and the power grid L line is small in heating and high in efficiency.

Description

Communication power supply circuit

[ technical field ]

The utility model relates to a communication power supply technical field especially relates to a communication power supply circuit that application effect is outstanding.

[ background art ]

The communication equipment has strict requirements on a power supply due to special functions, has strict requirements on interference resistance and generated interference signals, has wider application and requirement of products, and is beneficial to the stable development of companies because the power supply of the type has great help for expanding the product lines of the companies.

For technical reasons, a power supply with a frequency line is used conventionally, so that the power supply efficiency is low and the heat is serious; communication power supply uses more and more in daily life, and it is inevitable to adopt high-efficient switching power supply, and switching power supply must solve the problem of preventing thunderbolt, preventing power frequency noise interference, and above two problems have been solved from the scheme lectotype to this design.

[ contents of utility model ]

For overcoming the problem that prior art exists, the utility model provides a communication power supply circuit that application effect is outstanding.

The utility model provides a solution to the technical problem provide a communication power supply circuit, including current fuse F1, MOV101, FR101, CX101, LF101, bridge rectifier BD101, resistance R1, resistance R2, resistance R3, resistance R4, electric capacity C101, electric capacity C110, transformer T102, resistance R119, resistance R118, IC101, resistance R112, resistance R113, diode D102, resistance R120, electric capacity C102, resistance R59, electric capacity C103, resistance R8, electric capacity C5, diode D2, resistance R6, resistance R7, electric capacity C3, main control chip U1, electric capacity C1; the power grid L line is firstly connected with one end of an MOV101 and the input end of an FR101 after passing through a current fuse F1, the output end of the FR101 is connected with one end of a CX101 and then connected with the input end of an LF101, and the output end of the LF101 is connected with the input end of a bridge stack BD 101; the power grid N line is connected with the other ends of the MOVs 101 and the CX1010 and then connected with the other input end of the rectifier bridge stack BD 1; the resistor R1, the resistor R2, the resistor R3 and the resistor R4 are combined in a series-parallel connection mode and then are connected to two ends of the CX101 in parallel to form a CX101 discharge circuit; alternating current is rectified by a BD101, filtered by capacitors C102 and C110 and then supplies power to a main coil of a transformer T102; the resistors R119 and R118 provide starting voltage for the IC101 when the power is on, and after the IC101 starts to work, a controllable square wave is output at pins 5 and 6 of the IC 101; pins 5 and 6 of the IC101 are connected with a main winding of the transformer T102 to control the current and time flowing through the main winding of the transformer T102; the resistors R112 and R113 are connected with the 4 th pin of the IC101, and convert the current signal flowing through the transformer T102 into a voltage signal to be sent to the IC101 for detection; one end of an auxiliary winding of the transformer T102 is connected with the positive end of the D102, the negative electrode of the auxiliary winding is connected with the resistor R120, the other end of the R120 is connected with one end of the R59 after being connected with the capacitor C102, and the other end of the R59 is connected with the No. 1 pin of the IC101 after being connected with the capacitor C103, so that normal working voltage is provided for the IC 101; r8 is connected in series with C5 and then connected in parallel with two ends of D2 to serve as a protection circuit of D2 and improve EMI effect; the auxiliary winding is connected with the 3 rd pin of the main control chip U1 through a network formed by R6, R7 and C3 to provide feedback voltage for the U1; the master control chip U1 adjusts the frequency and time of square wave output by the 5 th and 6 th pins of the master control chip U1 according to signals provided by the 3 rd and 4 th pins, ensures that the output obtains required voltage and current, and sets an over-power protection point of a power supply; the diode D1 is connected with the 5 th and 6 th pins of the main control chip U1 and the output of the primary winding of the transformer T102, the negative end of the diode D1 is connected with one end of a parallel resistor network formed by R2 and R2A, the capacitor C1 is connected with the resistor R1 in parallel, one end of the capacitor C1 is connected with the positive end of the EC1, and the other end of the capacitor C3838 is connected with the resistor network formed by R2 and R2A.

Preferably, the main control chip U1 is a power chip G5138 PL.

Compared with the prior art, the single-panel PCB design of the communication power supply circuit has the advantages that the transformer adopts a secondary-extending structure, so that the manufacturing difficulty of the transformer is reduced on the basis of ensuring the safety distance; most of electronic parts adopt SMT technology, which is beneficial to batch production and improves production efficiency and quality; the master control power chip G5138PL digital chip has stable performance and good consistency; and an IW7707C synchronous rectification scheme is adopted in the secondary stage, so that the heat generation is small and the efficiency is high.

[ description of the drawings ]

Fig. 1 is a schematic diagram of a circuit connection of a communication power supply circuit according to the present invention.

[ detailed description of the invention ]

To make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, the communication power circuit 1 of the present invention includes a current fuse F1, an MOV101, an FR101, a CX101, an LF101, a bridge stack BD101, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C101, a capacitor C110, a transformer T102, a resistor R119, a resistor R118, an IC101, a resistor R112, a resistor R113, a diode D102, a resistor R120, a capacitor C102, a resistor R59, a capacitor C103, a resistor R8, a capacitor C5, a diode D2, a resistor R6, a resistor R7, a capacitor C3, a main control chip U1, and a capacitor C1.

After the alternating current is rectified and filtered, a controllable square wave is generated by a power chip G5138PL, the square wave reduces higher voltage to safety voltage required by people through a transformer, the high voltage is rectified by a secondary synchronous rectification chip and filtered by an output electrolytic capacitor to form 12V direct current voltage, and the output voltage is connected to an output wire to supply power for equipment; in order to ensure that the later receiving electric equipment is not interfered by power grid power frequency noise, the power supply adopts a Y-free scheme design.

The core of the circuit is that a controllable square wave is generated by a power chip G5138PL of an integrated PWM control chip and an MOS power device, the square wave reduces the high voltage after alternating current rectification to the required safe low voltage through the electromagnetic coupling of a primary winding and a secondary winding in a transformer, and the output synchronous rectification chip outputs 12V direct current voltage after rectification and filtering; g5138PL detects the voltage of the auxiliary winding according to the resistance voltage-dividing network, controls the working state of the power supply according to the detected voltage signal, and ensures that the power supply stably outputs the set voltage value; the current flowing through the power tube is detected through the resistor connected in series with the power tube, and when the voltage on the detection resistor reaches a set value of the chip, the current enters a protection state to ensure that the output power of the power supply is controlled within a safe range; the secondary adopts a synchronous rectification chip to effectively reduce the loss of the rectification circuit, effectively reduce the overall temperature of the product and ensure the working reliability of the product.

The power grid L line is firstly connected with one end of an MOV101 and the input end of an FR101 after passing through a current fuse F1, the output end of the FR101 is connected with one end of a CX101 and then connected with the input end of an LF101, the output end of the LF101 is connected with the input end of a bridge stack BD101, and the power grid N line is connected with the other end of the MOV101 and the CX1010 and then connected with the other input end of a rectifier bridge stack BD 1; r1, R2, R3 and R4 are combined in series and parallel and then connected in parallel with two ends of CX101 to form a CX101 discharge circuit; alternating current is rectified by a BD101, filtered by capacitors C102 and C110 and then supplies power to a main coil of a transformer T102; r119 and R118 provide starting voltage for the IC101 when the power is on, after the IC101 starts to work, controllable square waves are output at the 5 th pin and the 6 th pin of the IC101, the 5 th pin and the 6 th pin of the IC101 are connected with the main winding of the transformer T102 to control the current and the time flowing through the main winding of the transformer T102, and R112 and R113 are connected with the 4 th pin of the IC101 to convert the current signal flowing through the transformer into voltage signals for the detection of the IC 101; one end of an auxiliary winding of the transformer is connected with the positive end of the D102, the negative electrode of the auxiliary winding of the transformer is connected with the resistor R120, the other end of the R120 is connected with one end of the R59 after being connected with the capacitor C102, and the other end of the R59 is connected with the No. 1 pin of the IC101 after being connected with the capacitor C103, so that normal working voltage is provided for the IC 101; r8 is connected in series with C5 and then connected in parallel with two ends of D2 to serve as a protection circuit of D2 and improve EMI effect; the auxiliary winding is connected with the 3 rd pin of the U1 through a network consisting of R6, R7 and C3 to provide a feedback voltage for the U1; the U1 adjusts the frequency and time of square wave output by the 5 th and 6 th pins of the U1 according to signals provided by the 3 rd and 4 th pins, ensures that the output obtains required voltage and current, and sets an over-power protection point of a power supply; the diode D1 is connected with the 5 th and 6 th pins of the chip U1 and the output of the primary winding of the transformer T1, the negative end of the diode D1 is connected with one end of a parallel resistor network formed by R2 and R2A, the capacitor C1 is connected with the resistor R1 in parallel, one end of the capacitor C1 is connected with the positive end of the EC1, and the other end of the capacitor C1 is connected with the resistor network formed by R2 and R2A, so that a peak absorption loop is formed, and the working safety of the chip U1 is guaranteed.

The positive end of the secondary winding of the transformer T1 is connected with the 1 st, 2 nd and 3 rd pins of U2, the 5 th, 6 th, 7 th and 8 th pins of U2 are connected with the positive ends of EC3 and EC4 and then connected with one input end of LF2, the negative electrode of the output of the transformer is connected with the negative electrodes of EC3 and EC4 and then connected with the other input end of LF2, and the output of LF2 is respectively connected with the positive electrode and the negative electrode of the output line for external power supply; r14 and C7 are connected in parallel and then are respectively connected between the 3 rd pin and the 4 th pin of U2 to provide working voltage for U2; the R15 is connected in parallel with the two ends of the EC3 to be used as a power supply output load, so that the working stability of the power supply under light load is ensured.

The innovation points are as follows:

1. the project adopts a chip scheme of a digital PSR integrated power device, and has high uniformity, high efficiency and low standby power consumption.

2. Except for the transformer, the capacitor, the fuse and the master control IC, all the low-power resistor, the capacitor and the secondary synchronous rectification IC adopt the SMT process, so that the production efficiency is improved, and the consistency of the production quality is ensured.

3. The voltage and the current of the G5138PL chip are detected simultaneously, so that the output voltage is stable, and the output power of the power supply can be controlled.

4. And the secondary output adopts a synchronous rectification scheme, so that the efficiency is high.

5. The input end is connected with the piezoresistor, so that the damage of lightning stroke to the power supply and the rear-stage equipment is effectively prevented, and meanwhile, the NTC resistor is added, so that the input impact current is effectively reduced, and the reliability of the power supply is improved.

Compared with the prior art, the single-panel PCB design of the communication power supply circuit 1 has the advantages that the transformer adopts a secondary extension structure, so that the manufacturing difficulty of the transformer is reduced on the basis of ensuring the safety distance; most of electronic parts adopt SMT technology, which is beneficial to batch production and improves production efficiency and quality; the master control power chip G5138PL digital chip has stable performance and good consistency; and an IW7707C synchronous rectification scheme is adopted in the secondary stage, so that the heat generation is small and the efficiency is high.

The above-mentioned embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A communication power supply circuit, characterized by: the current fuse circuit comprises a current fuse F1, an MOV101, an FR101, a CX101, an LF101, a bridge stack BD101, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C101, a capacitor C110, a transformer T102, a resistor R119, a resistor R118, an IC101, a resistor R112, a resistor R113, a diode D102, a resistor R120, a capacitor C102, a resistor R59, a capacitor C103, a resistor R8, a capacitor C5, a diode D2, a resistor R6, a resistor R7, a capacitor C3, a main control chip U1 and a capacitor C1; the power grid L line is firstly connected with one end of an MOV101 and the input end of an FR101 after passing through a current fuse F1, the output end of the FR101 is connected with one end of a CX101 and then connected with the input end of an LF101, and the output end of the LF101 is connected with the input end of a bridge stack BD 101; the power grid N line is connected with the other ends of the MOVs 101 and the CX1010 and then connected with the other input end of the rectifier bridge stack BD 1; the resistor R1, the resistor R2, the resistor R3 and the resistor R4 are combined in a series-parallel connection mode and then are connected to two ends of the CX101 in parallel to form a CX101 discharge circuit; alternating current is rectified by a BD101, filtered by capacitors C102 and C110 and then supplies power to a main coil of a transformer T102; the resistors R119 and R118 provide starting voltage for the IC101 when the power is on, and after the IC101 starts to work, a controllable square wave is output at pins 5 and 6 of the IC 101; pins 5 and 6 of the IC101 are connected with a main winding of the transformer T102 to control the current and time flowing through the main winding of the transformer T102; the resistors R112 and R113 are connected with the 4 th pin of the IC101, and convert the current signal flowing through the transformer T102 into a voltage signal to be sent to the IC101 for detection; one end of an auxiliary winding of the transformer T102 is connected with the positive end of the D102, the negative electrode of the auxiliary winding is connected with the resistor R120, the other end of the R120 is connected with one end of the R59 after being connected with the capacitor C102, and the other end of the R59 is connected with the No. 1 pin of the IC101 after being connected with the capacitor C103, so that normal working voltage is provided for the IC 101; r8 is connected in series with C5 and then connected in parallel with two ends of D2 to serve as a protection circuit of D2 and improve EMI effect; the auxiliary winding is connected with the 3 rd pin of the main control chip U1 through a network formed by R6, R7 and C3 to provide feedback voltage for the U1; the master control chip U1 adjusts the frequency and time of square wave output by the 5 th and 6 th pins of the master control chip U1 according to signals provided by the 3 rd and 4 th pins, ensures that the output obtains required voltage and current, and sets an over-power protection point of a power supply; the diode D1 is connected with the 5 th and 6 th pins of the main control chip U1 and the output of the primary winding of the transformer T102, the negative end of the diode D1 is connected with one end of a parallel resistor network formed by R2 and R2A, the capacitor C1 is connected with the resistor R1 in parallel, one end of the capacitor C1 is connected with the positive end of the EC1, and the other end of the capacitor C3838 is connected with the resistor network formed by R2 and R2A.

2. A communication power supply circuit as claimed in claim 1, wherein: the main control chip U1 is a power chip G5138 PL.