Wide-voltage self-switching standby power circuit

Abstract

The utility model discloses a wide voltage self-switching standby power circuit, which is characterized in that a standby power supply outputs direct current 12V through a DC-DC step-down circuit, the direct current 12V output by a mains supply switching power supply and the direct current 12V output by the mains supply switching power supply realize intelligent switching under the action of a change-over switch relay 1, the output direct current 12V is supplied to a restart switch relay 2, and the output direct current 12V is directly supplied to terminal equipment for use. When external power-off restart is needed in operation of the terminal equipment, the terminal equipment sends a high-level control system to the restart switch relay 2, and power-off restart is achieved. According to the utility model, the DC-DC power supply circuit with wide power supply input is adopted, the DC-DC voltage reduction of the power supply of the lithium battery is carried out to 12V, the 12V power supply is output to the cabinet control system for operation, the relay and related circuits are adopted to realize intelligent autonomous switching between the 12V commercial power and the 12V standby power supply, and the simplification and low cost of the standby power system are realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to a wide voltage self-switching standby power supply circuit and belongs to the technical field of circuit. BACKGROUND

[0002] At present, the battery replacement cabinet of the two-wheeled electric vehicle needs to work 24 hours a year outdoors, and needs to consider the normal working condition after the power failure. Therefore, the standby battery power supply needs to be considered. The commonly used schemes are two kinds: the first one is to add a 12V storage battery or lithium battery in the cabinet; the second one is to use the lithium battery in the cabinet as a standby battery, but a DC-DC switching power supply needs to be added. The cost of the above two schemes is slightly high, and the intelligent autonomous switching function cannot be realized. When the power fails, the standby power supply automatically switches to power supply; when the power supply comes, it automatically switches to the power supply. UTILITY MODEL CONTENTS

[0003] The utility model aims at providing a wide voltage self-switching standby power supply circuit to solve the problems in the above background technology.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A wide voltage self-switching standby power supply circuit, the standby power supply passes through the DC-DC step-down circuit to output direct current 12V, and the direct current 12V output by the switching power supply of the power supply is switched under the action of the switching relay 1 to realize intelligent switching. The direct current 12V output by the switching relay 2 is directly used for the terminal equipment, and when the terminal equipment needs to be restarted externally, the terminal equipment sends a high-level control system to the switching relay 2, which realizes power failure restart.

[0006] Preferably, the standby power supply is an in-cabinet battery or an independent standby battery.

[0007] Preferably, the wide voltage self-switching standby power supply circuit comprises a DC-DC step-down circuit and a relay switching circuit. Four-way standby power supplies are input from terminals J2, J3, J5 and J6. The positive electrode of the power supply enters the DC-DC step-down circuit through diodes D2, D4, D6 and D8, and the voltage 12V is output through the step-down circuit composed of power supply chips U1, U2 and inductors L1 and L2.

[0008] The 12V output of the standby power supply is filtered through the patch electrolytic capacitor C6 and the patch electrolytic capacitor C13, and then filtered through the patch capacitor C5 and the capacitor C15 and output to the relay K1; the mains power supply enters through the terminal J1, enters the relay switching circuit through the Schottky diode D10, and the resistor R1 and the resistor R2, the capacitor C1, the P-MOS tube Q1, the diode D1, and the relay K1 form a relay switching circuit; when the 12V-HOST of the resistor R1 has no voltage, the G pole of the P-MOS tube Q1 is at a low level, the D pole and the S pole of the P-MOS tube Q1 are turned on, the relay K1 is turned on, the 3 pin and the 4 pin of the relay K2 are attracted, and the diode D16 and the relay K2 form a restart switch; when the 2 pin of the relay K2 is at a low level, the relay K2 is in an attracted state, the 3 pin and the 4 pin of the relay K2 are short-circuited together, and system restart is realized.

[0009] Preferably, the model of the power supply chip U1 and the power supply chip U2 is SY8513FCC.

[0010] Preferably, the model of the P-MOS tube Q1 is NCE60P25K.

[0011] Compared with the prior art, the utility model has the advantages that: the utility model adopts the DC-DC power supply circuit of wide power input, the power supply DC-DC of lithium battery (48V, 60V, 72V lithium battery) is reduced to 12V and is output to the cabinet control system work, the relay and the related circuit are adopted to realize the intelligent and independent switching of the mains 12V and the standby power supply 12V, and the standby power supply system is simplified and low in cost. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the standby power supply system framework of the utility model;

[0013] Figure 2 It is the DC-DC reduction circuit diagram of the utility model;

[0014] Figure 3 It is the relay switching circuit diagram of the utility model. DETAILED DESCRIPTION

[0015] The technical scheme in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model.

[0016] As Figure 1As shown in the figure, a wide voltage self-switching standby power supply circuit, the standby power supply is output through the DC-DC buck circuit DC 12V, and the DC 12V output by the mains switching power supply, realizes intelligent switching under the action of switching relay 1, the output DC 12V of which is given to the restart switching relay 2, and the output DC 12V of which is directly given to the terminal equipment for use, when the terminal equipment needs to be restarted by external power failure during operation, the terminal equipment sends a high level control system to the restart switching relay 2, which realizes power failure restart. The standby power supply is the battery in the warehouse or the independent standby battery.

[0017] As shown in the figure, Figure 2 , Figure 3 A wide voltage self-switching standby power supply circuit, including DC-DC buck circuit and relay switching circuit, four-way standby power supply is input from terminal J2, terminal J3, terminal J5 and terminal J6, the positive electrode of which enters the DC-DC buck circuit through diode D2, diode D4, diode D6 and diode D8, and is filtered through patch aluminum electrolytic capacitor C2, patch aluminum electrolytic capacitor C10 and patch capacitor C7, patch capacitor C8, patch capacitor C10 and patch capacitor C11 into power supply chip U1 and power supply chip U2, and outputs voltage 12V through the buck circuit composed of power supply chip U1, power supply chip U2 and inductor L1 and inductor L2;

[0018] The 12V output by the standby power supply is filtered through patch electrolytic capacitor C6 and patch electrolytic capacitor C13, and then filtered through patch capacitor C5 and capacitor C15 and output to relay K1, the mains power supply enters from terminal J1, and enters the relay switching circuit through Schottky diode D10, and resistor R1 and resistor R2, capacitor C1, P-MOS tube Q1, diode D1, relay K1 form a relay switching circuit, when the 12V-HOST of resistor R1 has no voltage, the G pole of P-MOS tube Q1 is at low level, the D pole and S pole of P-MOS tube Q1 are conductive, relay K1 is conductive, the 3 pin and 4 pin of relay K2 are attracted, and diode D16 switching diode and relay K2 form a restart switch, when the 2 pin of relay K2 is at low level, relay K2 is in the state of being attracted, the 3 pin and 4 pin of relay K2 are shorted together, and system restart is realized.

[0019] The model of power supply chip U1 and power supply chip U2 is SY8513FCC. The model of P-MOS tube Q1 is NCE60P25K.

[0020] As shown in the figure, Figure 2, DC-DC step-down circuit, standby power input DC-DC chip selected silergy (silergy) SY8513FCC, the chip is wide voltage 4.5V~100V input, output voltage adjustable, maximum current 3A, switching frequency 500kHz. We will adjust the circuit output voltage to 12V. J2, J3, J5, J8 terminal interface exchange battery power supply, D2 and D3 are Schottky diodes, which is to prevent reverse connection of power supply and play a protective role. Capacitor C2 aluminum capacitor, C7 chip capacitor, C8 chip capacitor, which is to filter. U1 is a DC-DC step-down power supply chip, which is connected with the adjacent circuit L1 inductance and resistance capacitor to form a DC-DC step-down circuit, which rectifies the single bin power supply (12V~100V) to 12V output. Resistance R3 and R4 are voltage output adjustment devices, and the calculation formula is: VOUT=0.8×(1+R3 / R4). Capacitor C6 is an aluminum electrolytic capacitor, and C5 is a chip capacitor. In order to make the output 12V voltage more stable, C6 and C5 are used for power output filtering.

[0021] As Figure 3 , the relay switching circuit, i.e. the relay 1 (switching switch) and the relay 2 (restart switch) circuit, 12V-HOST is the main power supply of the 12V switching power supply, 12V-STANDBY is the 12V output by the DC-DC step-down of the standby power supply, and 12V_OUT is the total 12V output. K1 and K2 are 5-pin relays, which serve as switching switches in the circuit. D1 and D16 are chip switching diodes, which mainly serve as freewheeling and protection when the relay is working. Q1 is a P-MOS tube, which serves as a relay control in the circuit. When 12V-HOST has power, Q1 is a P-MOS tube in a non-conductive state, and the relay K1 is in a normally open state (the 4-pin and 5-pin of the relay are in contact), and the 12V-HOST main power supply is working. When 12V-HOST is powered off, Q1 is a P-MOS tube in a conductive state, and the 1-pin of the relay has 12V, and the relay K1 is in a normally closed state (the 4-pin and 3-pin of the relay are in contact), and the 12V-STANDBY auxiliary power supply is working.

[0022] VCC12V_OUT is the 12V output of the system to the outside world. When the external system encounters a need to restart, a low-level signal needs to be given to REST externally, and the relay K2 works to achieve restart.

[0023] The above is the preferred embodiment of the present application. For ordinary skilled persons in the art, according to the teaching of the present application, the changes, modifications, replacements and variations of the embodiments without departing from the principles and spirits of the present application still fall within the protection scope of the present application.

Claims

1. A wide voltage self-biased backup power circuit, characterized by, The standby power supply outputs DC 12V through a DC-DC step-down circuit, and the DC 12V output by the mains switching power supply, which realizes intelligent switching under the action of a switching relay 1, is output to a restart switching relay 2, and the DC 12V output by the restart switching relay 2 is directly used by the terminal equipment. When the terminal equipment needs to be restarted due to external power failure, the terminal equipment sends a high-level control system to the restart switching relay 2, which realizes power failure and restart.

2. A wide voltage self-bypassing backup power circuit as claimed in claim 1, wherein, The standby power supply is an in-cage battery or an independent standby battery.

3. A wide voltage self-biased backup power supply circuit as claimed in claim 1, wherein, The DC-DC step-down circuit and the relay switching circuit are included, and four-way standby power supplies are input from terminals J2, J3, J5 and J6. The positive poles of the power supplies enter the DC-DC step-down circuit through diodes D2, D4, D6 and D8, and the voltage 12V is output through the step-down circuit composed of the power supply chip U1, the power supply chip U2 and inductors L1 and L2 after being filtered by patch aluminum electrolytic capacitors C2 and C10 and patch capacitors C7, C8, C10 and C11; The 12V output by the standby power supply is filtered by patch electrolytic capacitors C6 and C13, and then filtered by patch capacitors C5 and C15 and output to the relay K1. The mains power supply enters from the terminal J1, enters the relay switching circuit through the Schottky diode D10, and the resistance R1, the resistance R2, the capacitor C1, the P-MOS tube Q1, the diode D1 and the relay K1 form a relay switching circuit. When the resistance R1 has no voltage, the G pole of the P-MOS tube Q1 is at a low level, the D pole and the S pole of the P-MOS tube Q1 are conductive, the relay K1 is conductive, the 3 pin and the 4 pin of the relay K2 are attracted, and the diode D16 and the relay K2 form a restart switch. When the 2 pin of the relay K2 is at a low level, the relay K2 is in an attracted state, the 3 pin and the 4 pin of the relay K2 are shorted together, and the system is restarted.

4. A wide voltage self-bypassing backup power circuit as claimed in claim 3, wherein, The models of the power supply chip U1 and the power supply chip U2 are SY8513FCC.

5. A wide voltage self-biased backup power supply circuit as claimed in claim 3, wherein, The model of the P-MOS tube Q1 is NCE60P25K.

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