DC power supply slow start circuit
A technology of slow-start circuit and DC power supply, applied in electrical components, output power conversion devices, etc., can solve problems affecting the overall business of the chassis, and achieve the effects of improving slow-start time, reducing current impact, and precise control
Inactive Publication Date: 2020-06-30
FENGHUO COMM SCI & TECH CO LTD
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Problems solved by technology
At this time, the single disk may not have enough time to configure the single disk, save the parameters and then power off, which may affect the overall business of the chassis
Method used
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[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.
[0027] see figure 1 As shown, the embodiment of the present invention provides a DC power supply slow start circuit, including a voltage divider circuit, a field effect transistor T1 and a switch control circuit.
[0028] The voltage dividing circuit includes a resistor R1, a resistor R2 and a capacitor C1, the resistor R1 and the resistor R2 are connected in series between the first node and the second node, the resistor R1 and the capacitor C1 are connected in parallel; the gate of the field effect transistor T1 The electrode and the source are connected to both ends of the capacitor C1, and the source of the field effect transistor T1 is connected to the second node; the switch control circuit includes a voltage regulator transistor D1 and a triode D2, and the cathode of the voltage regulator transistor D1 is connected to the second node. ...
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The invention discloses a DC power supply slow start circuit, which relates to the technical field of communication equipment, and comprises a voltage division circuit, a field effect transistor T1 and a switch control circuit; the voltage division circuit comprises a resistor R1, a resistor R2 and a capacitor C1, the resistor R1 and the resistor R2 are connected in series, and the resistor R1 andthe capacitor C1 are connected in parallel; a grid electrode and a source electrode of the field effect transistor T1 are connected with two ends of the capacitor C1; the switch control circuit comprises a voltage-regulator tube D1 and a triode D2, the cathode of the voltage-regulator tube D1 is connected with the first node, the anode of the voltage-regulator tube D1 is connected with the base of the triode D2, the emitter of the triode D2 is connected between the resistor R1 and the resistor R2, and the collector of the triode D2 is connected with the second node. According to the DC powersupply slow start circuit provided by the invention, the slow start time is greatly prolonged, the current impact can be effectively reduced, the voltage stabilizing tube D1 with different voltage stabilizing values can be selected according to the actual requirements, and the slow start voltage can be accurately controlled.
Description
technical field [0001] The invention relates to the technical field of communication equipment, in particular to a DC power supply slow start circuit. Background technique [0002] There are two power supply methods for communication equipment: AC and DC power supply. Generally, there are more DC power supply methods, and most of them use -48V DC power supply method. Since most of the communication equipment adopts a rack-mounted structure, the single disk of the communication equipment is required to support hot swapping, that is, the single disk of the communication equipment is required to be inserted or pulled out normally without damaging the single disk when the power supply of the equipment is cut off. It does not affect the services of other single disks. At the same time, before a single disk is pulled out and powered off, the single disk has enough time for configuration and service storage. [0003] The power of the communication single disk is relatively high. I...
Claims
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IPC IPC(8): H02M1/36H02M1/32H02M1/34
CPCH02M1/32H02M1/34H02M1/36
Inventor 许华王可覃玲芳
Owner FENGHUO COMM SCI & TECH CO LTD