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CN-224233551-U - Power supply slow start circuit and communication equipment

CN224233551UCN 224233551 UCN224233551 UCN 224233551UCN-224233551-U

Abstract

The utility model discloses a slow power supply starting circuit and communication equipment, and relates to the technical field of power supply circuits, wherein the slow power supply starting circuit comprises a main control switch, an auxiliary control switch, a drainage unit, a first current limiting unit, a second current limiting unit and an energy storage unit; the first end and the second end of the main control switch are respectively connected with a power supply and a load; the two ends of the parallel connection of the drainage unit and the energy storage unit are respectively connected with the first end and the third end of the main control switch; the first end and the second end of the second current limiting unit are respectively connected with a power supply and the third end of the auxiliary control switch, and the second end of the auxiliary control switch is grounded. The utility model realizes slow start of the power supply by adopting a simple discrete device, and has low cost and simple circuit.

Inventors

  • PANG HANWEN

Assignees

  • 烽火通信科技股份有限公司

Dates

Publication Date
20260512
Application Date
20250417

Claims (10)

  1. 1. The slow power supply starting circuit is characterized by comprising a main control switch, an auxiliary control switch, a drainage unit, a first current limiting unit, a second current limiting unit and an energy storage unit; the first end and the second end of the main control switch are respectively connected with a power supply and a load; The two ends of the parallel connection of the drainage unit and the energy storage unit are respectively connected with the first end and the third end of the main control switch; The first end and the second end of the first current limiting unit are respectively connected with the third end of the main control switch and the first end of the auxiliary control switch; The first end and the second end of the second current limiting unit are respectively connected with a power supply and the third end of the auxiliary control switch, and the second end of the auxiliary control switch is grounded.
  2. 2. The power slow start circuit of claim 1, further comprising: the overcurrent protection unit is connected with the first end and the second end of the main control switch, is also connected with the third end of the auxiliary control switch, and is used for controlling the auxiliary control switch to be turned on or off according to the current flowing through the main control switch.
  3. 3. The power slow start circuit according to claim 2, wherein the overcurrent protection unit comprises: The non-inverting input end of the operational amplifier is connected with the first end of the main control switch, and the inverting input end of the operational amplifier is connected with the second end of the main control switch; the non-inverting input end of the comparator is connected with the reference voltage, the inverting input end of the comparator is connected with the output end of the operational amplifier, and the output end of the comparator is connected with the third end of the auxiliary control switch.
  4. 4. The power slow start circuit of claim 1, wherein: The main control switch is a metal oxide semiconductor field effect transistor, and the auxiliary control switch is a bipolar transistor.
  5. 5. The slow start power supply circuit according to claim 1, wherein the bleeder unit is a first resistor.
  6. 6. The slow start power supply circuit according to claim 1, wherein the first current limiting unit is a second resistor.
  7. 7. The slow start power supply circuit according to claim 1, wherein the second current limiting unit is a third resistor.
  8. 8. The slow start power supply circuit of claim 1, wherein the energy storage unit is a first capacitor.
  9. 9. The power slow start circuit of claim 1, further comprising: and the first end of the second capacitor is connected with the third end of the auxiliary control switch, and the second end of the second capacitor is grounded.
  10. 10. A communication device comprising the power slow start circuit of any one of claims 1-9.

Description

Power supply slow start circuit and communication equipment Technical Field The present utility model relates to the field of power supply circuits, and in particular, to a slow power supply start circuit and a communication device. Background The power supply circuit refers to a circuit design of a power supply portion for supplying power to the electric equipment. Slow power-on refers to slowing down the rising speed of the output voltage or current of the power supply through a specific mechanism when the power supply is started so as to avoid instant impact on load equipment. In the prior art, a power supply circuit mostly adopts a power switch type integrated chip to realize a slow starting function. However, the cost of the power switch type integrated chip is high, which leads to an increase in the cost of the entire circuit. Disclosure of utility model The embodiment of the utility model provides a power supply slow starting circuit and communication equipment, which are used for solving the technical problems that the cost of a circuit is increased due to higher price of an integrated chip because the power supply slow starting function is realized by adopting a power switch type integrated chip in the related technology. In a first aspect, a slow power supply starting circuit is provided, which comprises a main control switch, an auxiliary control switch, a current leakage unit, a first current limiting unit, a second current limiting unit and an energy storage unit; the first end and the second end of the main control switch are respectively connected with a power supply and a load; The two ends of the parallel connection of the drainage unit and the energy storage unit are respectively connected with the first end and the third end of the main control switch; The first end and the second end of the first current limiting unit are respectively connected with the third end of the main control switch and the first end of the auxiliary control switch; The first end and the second end of the second current limiting unit are respectively connected with a power supply and the third end of the auxiliary control switch, and the second end of the auxiliary control switch is grounded. In some embodiments, the power slow start circuit further comprises: the overcurrent protection unit is connected with the first end and the second end of the main control switch, is also connected with the third end of the auxiliary control switch, and is used for controlling the auxiliary control switch to be turned on or off according to the current flowing through the main control switch. In some embodiments, the overcurrent protection unit includes: The non-inverting input end of the operational amplifier is connected with the first end of the main control switch, and the inverting input end of the operational amplifier is connected with the second end of the main control switch; the non-inverting input end of the comparator is connected with the reference voltage, the inverting input end of the comparator is connected with the output end of the operational amplifier, and the output end of the comparator is connected with the third end of the auxiliary control switch. In some embodiments, the primary control switch is a metal oxide semiconductor field effect transistor and the secondary control switch is a bipolar transistor. In some embodiments, the bleeder unit is a first resistor. In some embodiments, the first current limiting unit is a second resistor. In some embodiments, the second current limiting unit is a third resistor. In some embodiments, the energy storage unit is a first capacitor. In some embodiments, the power slow start circuit further comprises: and the first end of the second capacitor is connected with the third end of the auxiliary control switch, and the second end of the second capacitor is grounded. In a second aspect, a communication device is provided that includes the aforementioned power slow start circuit. The technical scheme provided by the utility model has the beneficial effects that: the embodiment of the utility model provides a slow power supply starting circuit and communication equipment, wherein the slow power supply starting circuit can realize slow power supply starting by arranging an auxiliary control switch, a current leakage unit, a first current limiting unit, a second current limiting unit and an energy storage unit, wherein the auxiliary control switch, the current leakage unit, the first current limiting unit, the second current limiting unit and the energy storage unit can be simple discrete devices, an additional control circuit unit is not needed for controlling the switch, the cost is low, and the circuit is simple. Drawings In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the