CN201966821U

CN201966821U - Double-line output cross regulation circuit of switching power supply

Info

Publication number: CN201966821U
Application number: CN2010206793697U
Authority: CN
Inventors: 赵星宝; 何爱平
Original assignee: DONGGUAN YINGJU ELECTRONIC Co Ltd
Current assignee: DONGGUAN YINGJU ELECTRONIC Co Ltd
Priority date: 2010-12-24
Filing date: 2010-12-24
Publication date: 2011-09-07
Anticipated expiration: 2020-12-24

Abstract

The utility model relates to a double-line output cross regulation circuit of a switching power supply, which comprises a filter circuit, a rectification circuit, an auxiliary power supply control circuit, an auxiliary power supply inverter circuit, an auxiliary power supply secondary rectification circuit, an auxiliary power supply voltage regulator circuit and a standby logical control circuit. The double-line output cross regulation circuit of the switching power supply, disclosed by the utility model, aims to ensure the +5 V and +12 V output accuracy (+5 V output error is less than 0.25V, and +12 V output error is less than 1V), and simultaneously meet that requirement that the power supply efficiency can be up to the energy efficiency standard; the secondary coil of a transformer adopts stacking technology and weighting feedback control technology for simultaneously sampling and outputting +5 V and +12V by a degeneration control circuit, the coil of a multiplexing relay is adopted as a dummy load, so that the regulation rate and the efficiency of the double-line output of the switching power supply can be improved.

Description

The output of Switching Power Supply two-way intersects adjusts circuit

Technical field

The utility model relates to electric and electronic technical field, particularly relates to a kind of Switching Power Supply two-way output intersection and adjusts circuit.

Background technology

Use the power supply of voltage in several modes to satisfy the power supply needs of multiple multi-form external equipment such as needs such as PC, household electrical appliances and communication equipments.For dual-output power supply, its connection load be not to be changeless, when the load of certain output changes, can cause the output voltage of another one output to change.Because influencing each other of each road output voltage that the load change causes improves to intersect with dummy load usually and adjust with balance in the past, the stand-by power consumption of power supply and efficiency all can not satisfy related standards and customer requirements like this in order to adjust.

The utility model content

The purpose of this utility model is to avoid weak point of the prior art and a kind of Switching Power Supply two-way output intersection adjustment circuit is provided, and improves to intersect when adjusting reduction stand-by power consumption, raising power-efficient.

The purpose of this utility model realizes by following technical measures.

The output of Switching Power Supply two-way intersects adjusts circuit, it is characterized in that: comprise filter circuit, rectification circuit, accessory power supply inverter circuit, accessory power supply secondary commutation circuit, accessory power supply voltage stabilizing circuit, accessory power supply control circuit and standby logic control circuit; The output of described filter circuit is connected with the input of described rectification circuit, the output of described rectification circuit is connected with the input of described main power source inverter circuit and accessory power supply inverter circuit respectively, the output of standby logic control circuit is connected with the input of accessory power supply voltage stabilizing circuit simultaneously, the input of described accessory power supply inverter circuit is connected with the output of rectification circuit, the output of accessory power supply inverter circuit is connected with the input of accessory power supply secondary commutation circuit, the output of accessory power supply secondary commutation circuit is connected with the input of accessory power supply voltage stabilizing circuit, and the output of accessory power supply voltage stabilizing circuit is connected to second output interface and the 3rd output interface; The output of described accessory power supply control circuit is connected in the input of accessory power supply inverter circuit, and the input of accessory power supply control circuit is connected in the output of described accessory power supply secondary commutation circuit.

Switching Power Supply two-way of the present utility model output intersect adjust circuit for guarantee+5V ,+(output error of+5V is in 0.25V for the 12V output accuracy, the output error of+12V is in 1V), satisfy power-efficient simultaneously up to arriving the efficiency standard, the secondary coil of transformer has adopted the technology of piling up, negative feedback control circuit samples simultaneously+5V ,+12V output is with the control technology of weighted feedback, and the coil of multiplexing relay has improved the regulation and the efficient of Switching Power Supply two-way output as dummy load.

Description of drawings

Utilize accompanying drawing that the utility model is described further, but the content in the accompanying drawing does not constitute any restriction of the present utility model.

Fig. 1 is the circuit diagram of the Switching Power Supply of an embodiment adopting Switching Power Supply two-way output of the present utility model to intersect to adjust circuit.

Fig. 1 comprises:

Filter circuit 201, rectification circuit 202, main power source control circuit 203, main power source inverter circuit 204, main power source secondary commutation circuit 205, standby logic control circuit 206, accessory power supply control circuit 207, accessory power supply inverter circuit 208, accessory power supply secondary commutation circuit 209, accessory power supply voltage stabilizing circuit 210.

Embodiment

The utility model is described in further detail with the following Examples.

The circuit diagram of the Switching Power Supply of an embodiment who adopts Switching Power Supply two-way of the present utility model output to intersect to adjust circuit as shown in Figure 1, comprise the input interface CN1 that is used to connect AC power, filter circuit 201, rectification circuit 202, main power source control circuit 203, main power source inverter circuit 204, main power source secondary commutation circuit 205, standby logic control circuit 206, accessory power supply control circuit 207, accessory power supply inverter circuit 208, accessory power supply secondary commutation circuit 209, accessory power supply voltage stabilizing circuit 210, and the first output interface CN3 of output dc voltage, the second output interface CN4 and the 3rd output interface CN5.

Described filter circuit 201 comprises fuse F1, piezo-resistance 14D471 and NTC1, inductance L 1, L2, resistance R 1, R2, capacitor C X1, CX2, F1 one end is connected in 2 pins of input interface, the F1 other end is connected in the end of 14D471, NTC1 one end is connected in 1 pin of input interface, the other end is connected in the other end of 14D471, and L1 is connected in 14D471; R1 and R2 series connection, the end of R1 and R2 is connected in the end of CX1, and the other end of R1 and R2 is connected in the other end of CX1, and L1 is connected in CX1, and CX2 is connected in L2.

Described rectification circuit 202 comprises diode bridge BD1, capacitor C 1, C2, C3, resistance R 3, R4, switch J1; 1 pin of BD1 is connected in the end of R4 and the end of C1, and 2 pins of BD1 and 3 pins are connected to the two ends of the CX2 of

filter circuit

201, and 2 pins of BD1 also are connected in the end of J1; 4 pins of BD1 are connected in the other end of C1, the positive pole of C2 and the end of R3, and the negative pole of C2 is connected in the positive pole of C3, the minus earth of C3, the other end of another termination R3 of R4 and the other end of J1.

Described main power source control circuit 203 comprises capacitor C 4, C5, C8, C27, C28, resistance R 5, R6, R7, R8, R9, R12, R13, R14, R41, R42, R44, R46, R47, R48, R49, R50, R51, R52, R53, R54, integrated circuit (IC) 1, IC4, IC5, diode D2, light lotus root U3, capacitor C 29, C30, C31, C32, C33, C34, triode Q7, diode D9, DZD2; 4 pins of the BD1 of R5 one termination rectification circuit 202, the end of another termination R6, the end of another termination R7 of R6, the other end ground connection of R7,3 pins of C4 one termination IC1,1 pin of another termination IC1,2 pins of C5 one termination IC1 and the end of R8, the end of another termination C8,6 pins of another termination IC1 of C8 and the end of R14,4 pins of IC1 connect the end of R9, the other end ground connection of R9,8 pins of IC1 connect the negative pole of D2 and the end of R13, the end of another termination R12 of R13, and the positive pole of D2 connects the other end of R12; The D9 positive pole is connected in 6 pin of the secondary coil of T2, the D9 negative pole is connected in the end of C33, the end of C34, the end of DZD2 and 8 pins of IC4, the other end of C33 and C34 is connected in 7 pin of the secondary coil of T2, the end of R41 is connected in 7 pin of the secondary coil of T2, the other end of R41 is connected in the end of R42, the other end of R42 is connected in 3 pins of U3,1 pin of U3 is connected in the other end of R8, the 2 pin ground connection of U3,4 pins of U3 are connected in the collector electrode of Q7, the end of R44, the end of C28 and 1 pin of IC4, the other end of R44 is connected in the end of C27, the other end of C27 is connected in the other end of C28 and 2 pins of IC4,3 pins of IC4 are connected in the end of R45, the negative pole of IC5, the end of R45 and the end of R46,4 pins of IC4 are connected in the emitter of Q7, the end of C30, the end of R47, the end of C32, the negative pole of C29, the end of R53 and the end of R54, the other end of C30 is connected in the base stage of Q7 and the end of R48, the other end of R47 is connected in the other end of R46,6 pin of IC4, the end of C31 and the end of R50, the other end of C32 is connected in 5 pins of IC4, the end of R51, the positive pole of C29 is connected in the other end of C32, the other end of R53 is connected in the other end of R54 and the end of R52, the other end of R52 is connected in the other end of R45 and 1 pin of CN3,7 pins of IC4 are connected in the end of R49, the other end of R50 and the other end of R48, the other end of another termination C31 of R49, the other end of another termination RS of R51; U3 is PC817B, and IC1 is OB2287, and IC4 is LM358, and IC5 is TL431.

Described main power source inverter circuit 204 comprises resistance R 15, R16, diode D1, transformer T2, capacitor C 9, metal-oxide-semiconductor Q1, one end of the primary coil of 4 pins of the BD1 of R15 one termination rectification circuit 202, the end of C9 and T2, the negative pole of another termination D1 and the other end of C9, the positive pole of D1 connects the other end of the primary coil of the drain electrode of Q1 and T2, the source electrode of Q1 connects the end of R16, the other end ground connection of R16; Q1 is FQP12N60C, and D1 is FR107.

Main power source secondary commutation circuit 205 comprises capacitor C 22, C23, C24, C25, C26, resistance R 40, R43, RS, inductance L 3, L4, diode D81, D82; 8 pin of the secondary coil of C22 one termination T2, the positive pole of D81, the positive pole of D82, the end of another termination R40, the positive pole of the negative pole of another termination D81 of R40, the negative pole of D82, C23, the positive pole of C24 and the end of L3, the negative pole of C23 connects 7 pin, the negative pole of C24, the negative pole of C25 and the end of L4 of the secondary coil of T2; The other end of L3 connects the positive pole of C25 and the end of L4, and the other end of L4 connects an end, the end of R43 and 1 pin of the first output interface CN3 of C26, and the other end of C26 connects the end of RS, and the other end of RS connects the other end of R43 and 2 pins of CN3; D81 and D82 are MBR20200.

Standby logic control circuit 206 comprises triode Q2, Q3, Q5, Q6, resistance R 18, R18A, R18B, R19, R28, R29, R30, R38, R39, light lotus root U2, capacitor C 6, C7, C18, C19, C20, C21, safe capacitor C Y2, diode D10, relay coil RELAY-DPST, relay double-pole single throw K1; The end of C6 connects 7 pins of IC1 and the positive pole of C7, and the other end of C6 connects the negative pole of C7; The collector electrode of Q2 is connected in the end of C6, the emitter of Q2 is connected in the end of R18A and 1 pin of U2, the base stage of Q2 is connected in the other end of R18A, the end of R18, the other end of R18 is connected in the collector electrode of Q3, the grounded emitter of Q3, the base stage of Q3 is connected in the end of R18B and the end of R19, the other end of R19 connects 2 pins of U2, the other end of R18B is connected in the other end of C6,4 pins of U2 connect the end of R28, the collector electrode of another termination Q5 of R28, CY2 one end ground connection, CY2 other end connection circuit voltage reference point GND, the emitter of Q5 connects the end of C21, the base stage of Q5 connects the end of R29 and the other end of C21, the other end connection circuit voltage reference point GND of R29, K1 has a pair of normally opened

contact

1 and 2, and 3 and 4,1 contact connects the negative pole of D11, and 2 contacts connect 1 pin of IC6, and 3 contacts meet L6,4 contacts connect 4 pin of CN5, one end of the coil of relay R ELAY-DPST connects the negative pole of D10 and the end of C20, and the other end of RELAY-DPST connects the negative pole of D10, and the other end of C20 connects 4 pin of K1; The base stage of R30 one termination Q5,1 pin of another termination CN5, the end of R38, the base stage of another termination Q6 of R38, the collector electrode of Q6 connects the positive pole of D10, the negative pole of emitter connection circuit voltage reference point GND, the C18 of Q6, the end of C19 and the end of R39, the positive pole of C18 connects the other end of L6, the end of R34,3 pins of K1 and 3 pins of CN5,3 pins of another termination CN5 of C19,5 pins of another termination CN5 of R39; U2 is PC817B, and Q2 is 2N3906, and Q3 is 2N3904, and Q5 is MMBT3904, and Q6 is C1815.

Accessory power supply control circuit 207 comprises integrated circuit (IC) 2, IC3, light lotus root U1, capacitor C 11, C12, C17, resistance R 25, R26, R27, R31, R32, R33, R34, R35, R36, R37; 1 pin of IC2 connects the end of R25,2 pins of IC2 connect the other end of R25,3 pins of IC2 connect the end of C11 and 1 pin of U1, the other end ground connection of C11,4 pins of IC2 connect the end of R26 and R27,2 pins of another termination U1 of R26 and R27,7 pins of IC2 and 8 pin ground connection, C12 one end ground connection, the collector electrode of another termination of C12 Q2,3 pins of U1 connect the end of R32 and R33, and 4 pins of U1 connect the other end of R33, the end of R37 and the negative pole of IC3, the end of another termination L5 of R32, the positive pole of C15, the end of the negative pole of D7 and C35, the end of another termination R31 of C35, the positive pole of IC3 meet an end and the circuit voltage datum mark GND of R36, and the adjustment utmost point of IC3 connects the end of C17 and the end of R35,1 pin of another termination K1 of R35, the other end of another termination R37 of C17, the end of another termination R34 of R36, the end of another termination L6 of R34, the positive pole of C16 connects the other end of L5, and the negative pole of C16 connects the negative pole of C15; IC2 is OB2358, and IC3 is TL431, and U1 is PC817B.

Accessory power supply inverter circuit 208 comprises capacitor C 13, C14, safe capacitor C Y1, diode D5, D6, resistance R 21, R23, R24, transformer T1; 2 pins of R24 one termination IC2, the negative pole of another termination D6, the positive pole of D6 connects an end of second primary coil of T1, the minus earth of C13 and the other end that connects second primary coil of T1, the positive pole of C13 connects the end of R22, the end of another termination R21 of R22, the end of another termination C14 of R21, one end of the end of R23 and first primary coil of T1, the other end of another termination C14 of R23 and the negative pole of D5, the positive pole of D5 connects the other end of first primary coil of 5 pins of IC2 and 6 pins and T1, CY1 one end ground connection, other end connection circuit voltage reference point GND; D5 is FR107, and D6 is 1N4148.

Accessory power supply secondary commutation circuit 209 comprises diode D7, D11, capacitor C 15, C16, C35, C36, inductance L 5, L6, resistance R 31; The D11 positive pole is connected in an end of T1 secondary coil, and the D11 negative pole is connected in the positive pole of C36 and 1 pin of K1; D7 is 20N45/TO-220, and D11 is SB2100.

Accessory power supply voltage stabilizing circuit 210 comprises integrated circuit (IC) 6, inductance L 7 and L8, capacitor C 37, C38, C39, resistance R 58; 1 pin of IC6 connects 2 pins of K1, the negative pole of C36 is connected in the other end of the secondary coil of T1, the negative pole of C37, the end of R58, the negative pole of C38 and the end of L8, the 3 pin connection circuit voltage reference point GND of IC6, the positive pole of C37 connects 2 pins of IC6, the other end of R58 and the positive pole of C37, the positive pole of another termination C38 of L7 and the end of L8, another termination second output interface CN4, C39 and the 3rd output interface CN5 of L8; IC6 is 7812.

Should be noted that at last; above embodiment only is used to the technical solution of the utility model is described but not to the restriction of the utility model protection range; although the utility model has been done detailed description with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can make amendment or be equal to replacement the technical solution of the utility model, and not break away from the essence and the scope of technical solutions of the utility model.

Claims

1. Switching Power Supply two-way output intersection is adjusted circuit, it is characterized in that: comprise filter circuit, rectification circuit, accessory power supply inverter circuit, accessory power supply secondary commutation circuit, accessory power supply voltage stabilizing circuit, accessory power supply control circuit and standby logic control circuit; The output of described filter circuit is connected with the input of described rectification circuit, the output of described rectification circuit is connected with the input of described main power source inverter circuit and accessory power supply inverter circuit respectively, the output of standby logic control circuit is connected with the input of accessory power supply voltage stabilizing circuit simultaneously, the input of described accessory power supply inverter circuit is connected with the output of rectification circuit, the output of accessory power supply inverter circuit is connected with the input of accessory power supply secondary commutation circuit, the output of accessory power supply secondary commutation circuit is connected with the input of accessory power supply voltage stabilizing circuit, and the output of accessory power supply voltage stabilizing circuit is connected to second output interface and the 3rd output interface; The output of described accessory power supply control circuit is connected in the input of accessory power supply inverter circuit, and the input of accessory power supply control circuit is connected in the output of described accessory power supply secondary commutation circuit.

2. Switching Power Supply two-way output according to claim 1 intersects adjusts circuit, it is characterized in that: described filter circuit comprises fuse F1, piezo-resistance 14D471 and NTC1, inductance L 1, L2, resistance R 1, R2, capacitor C X1, CX2, F1 one end is connected in 2 pins of input interface, the F1 other end is connected in the end of 14D471, NTC1 one end is connected in 1 pin of input interface, the other end is connected in the other end of 14D471, and L1 is connected in 14D471; R1 and R2 series connection, the end of R1 and R2 is connected in the end of CX1, and the other end of R1 and R2 is connected in the other end of CX1, and L1 is connected in CX1, and CX2 is connected in L2.

3. Switching Power Supply two-way output according to claim 2 intersects adjusts circuit, and it is characterized in that: described rectification circuit comprises diode bridge BD1, capacitor C 1, C2, C3, resistance R 3, R4, switch J1; 1 pin of BD1 is connected in the end of R4 and the end of C1, and 2 pins of BD1 and 3 pins are connected to the two ends of the CX2 of filter circuit 201, and 2 pins of BD1 also are connected in the end of J1; 4 pins of BD1 are connected in the other end of C1, the positive pole of C2 and the end of R3, and the negative pole of C2 is connected in the positive pole of C3, the minus earth of C3, the other end of another termination R3 of R4 and the other end of J1.

4. Switching Power Supply two-way output according to claim 3 intersects adjusts circuit, and it is characterized in that: described accessory power supply control circuit comprises integrated circuit (IC) 2, IC3, light lotus root U1, capacitor C 11, C12, C17, resistance R 25, R26, R27, R31, R32, R33, R34, R35, R36, R37; 1 pin of IC2 connects the end of R25,2 pins of IC2 connect the other end of R25,3 pins of IC2 connect the end of C11 and 1 pin of U1, the other end ground connection of C11,4 pins of IC2 connect the end of R26 and R27,2 pins of another termination U1 of R26 and R27,7 pins of IC2 and 8 pin ground connection, C12 one end ground connection, the collector electrode of another termination of C12 Q2,3 pins of U1 connect the end of R32 and R33, and 4 pins of U1 connect the other end of R33, the end of R37 and the negative pole of IC3, the end of another termination L5 of R32, the positive pole of C15, the end of the negative pole of D7 and C35, the end of another termination R31 of C35, the positive pole of IC3 meet an end and the circuit voltage datum mark GND of R36, and the adjustment utmost point of IC3 connects the end of C17 and the end of R35,1 pin of another termination K1 of R35, the other end of another termination R37 of C17, the end of another termination R34 of R36, the end of another termination L6 of R34, the positive pole of C16 connects the other end of L5, and the negative pole of C16 connects the negative pole of C15; IC2 is OB2358, and IC3 is TL431, and U1 is PC817B.

5. Switching Power Supply two-way output according to claim 4 intersects adjusts circuit, and it is characterized in that: described standby logic control circuit comprises triode Q2, Q3, Q5, Q6, resistance R 18, R18A, R18B, R19, R28, R29, R30, R38, R39, light lotus root U2, capacitor C 6, C7, C18, C19, C20, C21, safe capacitor C Y2, diode D10, relay coil RELAY-DPST, relay double-pole single throw K1; The end of C6 connects 7 pins of IC1 and the positive pole of C7, and the other end of C6 connects the negative pole of C7; The collector electrode of Q2 is connected in the end of C6, the emitter of Q2 is connected in the end of R18A and 1 pin of U2, the base stage of Q2 is connected in the other end of R18A, the end of R18, the other end of R18 is connected in the collector electrode of Q3, the grounded emitter of Q3, the base stage of Q3 is connected in the end of R18B and the end of R19, the other end of R19 connects 2 pins of U2, the other end of R18B is connected in the other end of C6,4 pins of U2 connect the end of R28, the collector electrode of another termination Q5 of R28, CY2 one end ground connection, CY2 other end connection circuit voltage reference point GND, the emitter of Q5 connects the end of C21, the base stage of Q5 connects the end of R29 and the other end of C21, the other end connection circuit voltage reference point GND of R29, K1 has a pair of normally opened contact 1 and 2, and 3 and 4,1 contact connects the negative pole of D11, and 2 contacts connect 1 pin of IC6, and 3 contacts meet L6,4 contacts connect 4 pin of CN5, one end of the coil of relay R ELAY-DPST connects the negative pole of D10 and the end of C20, and the other end of RELAY-DPST connects the negative pole of D10, and the other end of C20 connects 4 pin of K1; The base stage of R30 one termination Q5,1 pin of another termination CN5, the end of R38, the base stage of another termination Q6 of R38, the collector electrode of Q6 connects the positive pole of D10, the negative pole of emitter connection circuit voltage reference point GND, the C18 of Q6, the end of C19 and the end of R39, the positive pole of C18 connects the other end of L6, the end of R34,3 pins of K1 and 3 pins of CN5,3 pins of another termination CN5 of C19,5 pins of another termination CN5 of R39; U2 is PC817B, and Q2 is 2N3906, and Q3 is 2N3904, and Q5 is MMBT3904, and Q6 is C1815.

6. Switching Power Supply two-way output according to claim 5 intersects adjusts circuit, and it is characterized in that: described accessory power supply inverter circuit comprises capacitor C 13, C14, capacitor C Y1, diode D5, D6, resistance R 21, R23, R24, transformer T1; 2 pins of R24 one termination IC2, the negative pole of another termination D6, the positive pole of D6 connects an end of second primary coil of T1, the minus earth of C13 and the other end that connects second primary coil of T1, the positive pole of C13 connects the end of R22, the end of another termination R21 of R22, the end of another termination C14 of R21, one end of the end of R23 and first primary coil of T1, the other end of another termination C14 of R23 and the negative pole of D5, the positive pole of D5 connects the other end of first primary coil of 5 pins of IC2 and 6 pins and T1, CY1 one end ground connection, other end connection circuit voltage reference point GND; D5 is FR107, and D6 is 1N4148.

7. Switching Power Supply two-way output according to claim 6 intersects adjusts circuit, and it is characterized in that: described accessory power supply secondary commutation circuit comprises diode D7, D11, capacitor C 15, C16, C35, C36, inductance L 5, L6, resistance R 31; The D11 positive pole is connected in an end of T1 secondary coil, and the D11 negative pole is connected in the positive pole of C36 and 1 pin of K1; D7 is 20N45/TO-220, and D11 is SB2100.

8. Switching Power Supply two-way output according to claim 7 intersects adjusts circuit, and it is characterized in that: described accessory power supply voltage stabilizing circuit comprises integrated circuit (IC) 6, inductance L 7 and L8, capacitor C 37, C38, C39, resistance R 58; 1 pin of IC6 connects 2 pins of K1, the negative pole of C36 is connected in the other end of the secondary coil of T1, the negative pole of C37, the end of R58, the negative pole of C38 and the end of L8, the 3 pin connection circuit voltage reference point GND of IC6, the positive pole of C37 connects 2 pins of IC6, the other end of R58 and the positive pole of C37, the positive pole of another termination C38 of L7 and the end of L8, another termination second output interface CN4, C39 and the 3rd output interface CN5 of L8; IC6 is 7812.