CN207184310U - A kind of active and standby input power circuit - Google Patents

Abstract

The utility model discloses a kind of active and standby input power circuit, including pulse-width modulation circuit, primary input circuit, standby input circuit and power output circuit；The pulse-width modulation circuit includes resistance R1, resistance R2, electric capacity C1, triode Q1, triode Q2 and driving transformer primary side T1C, one end connection external power supply end VCC of the resistance R1, other end connecting triode Q1 colelctor electrode, triode Q1 base stage, triode Q2 base stage is connected with resistance R2 one end, resistance R2 another termination pulse-width signal PWM, triode Q1 emitter stage, triode Q2 emitter stage is connected driving transformer primary side T1C one end after being concatenated with electric capacity C1, triode Q2 colelctor electrode, the driving transformer primary side T1C other end is connected with ground terminal GND.The utility model not only realizes power supply dual input, and the component used is few, and simple in construction, cost is low, and debugging is convenient.

Description

A kind of active and standby input power circuit

Technical field

It the utility model is related to a kind of power circuit, more particularly to a kind of active and standby input power circuit.

Background technology

It is well known that power supply is to provide the device of electric energy, electronic equipment such as desktop computer, notebook computer, server etc. The electric energy of each part both is from power supply.With the high speed development of modern science and technology, the continuous renewal of power device, pulsewidth modulation Technology development is gradually improved, and Switching Power Supply just develops towards short, small, light, thin direction.Meanwhile in order to ensure power supply to negative The stability of power supply is carried, the existing primary and backup two inputs inlet wire of power supply generally use is so, either primary to go back It is standby any one group of input power down, power supply still can power to successive load, however, existing active and standby dual input power source design Realize that generally existing component is various, the problems such as circuit structure is complicated, inconvenient debugging, and cost is high, these problems constrain The development of power supply, it would be highly desirable to solve.

Utility model content

The purpose of this utility model is, by a kind of active and standby input power circuit, to carry to solve background section above To the problem of.

To use following technical scheme up to this purpose, the utility model：

A kind of active and standby input power circuit, it include pulse-width modulation circuit, primary input circuit, standby input circuit and Power output circuit；The pulse-width modulation circuit includes resistance R1, resistance R2, electric capacity C1, triode Q1, triode Q2 and driving Transformer primary side T1C, the resistance R1 one end connection external power supply end VCC, other end connecting triode Q1 colelctor electrode, three Pole pipe Q1 base stage, triode Q2 base stage are connected with resistance R2 one end, resistance R2 another termination pulse-width signal PWM, triode Q1 emitter stage, triode Q2 emitter stage are connected the one of driving transformer primary side T1C after being concatenated with electric capacity C1 End, triode Q2 colelctor electrode, the driving transformer primary side T1C other end are connected with ground terminal GND；The primary input circuit bag Include resistance R3, resistance R4, diode D1, diode D2, resistance R5, field-effect transistor Q3, the driving transformer secondary T1A And main transformer primary side T2A, one end of the resistance R3 are connected with one end of resistance R4 one end, driving transformer secondary T1A, The resistance R4 other end is connected with diode D1 negative pole, diode D1 positive pole and the resistance R3 other end, the one of resistance R5 End, field-effect transistor Q3 grid connection, the resistance R5 other end and driving transformer secondary the T1A other end, electric capacity C2 One end, field-effect transistor Q3 source electrode, it is primary input negative pole end DC1VIN- connections, electric capacity the C2 other end and diode One end connection of D2 negative pole, main transformer primary side T2A, diode D2 positive pole connect primary input positive terminal DC1VIN+, field Effect transistor Q3 drain electrode is connected with the main transformer primary side T2A other end；The standby input circuit include resistance R6, Resistance R7, diode D3, diode D4, resistance R8, field-effect transistor Q4, the driving transformer secondary T1B and main transformer pressure Device primary side T2B, one end of the resistance R6 are connected with one end of resistance R7 one end, driving transformer secondary T1B, resistance R7 The other end be connected with diode D3 negative pole, diode D3 positive pole is imitated with the resistance R6 other end, resistance R8 one end, field Answer transistor Q4 grid to connect, the resistance R8 other end and the driving transformer secondary T1B other end, electric capacity C3 one end, Field-effect transistor Q4 source electrode, primary input negative pole end DC2VIN- connections, the electric capacity C3 other end and bearing for diode D4 Pole, main transformer primary side T2B one end connection, diode D4 positive pole connect primary input positive terminal DC2VIN+, field-effect Transistor Q4 drain electrode is connected with the main transformer primary side T2B other end；The power output circuit includes main transformer secondary T2C, diode D5, diode D6, inductance L1 and electrochemical capacitor C4, the diode D5 positive pole connection main transformer secondary T2C one end, the positive pole connection main transformer secondary T2C of the diode D6 other end, diode D5 negative pole, diode D6 negative pole is connected with inductance L1 one end, the inductance L1 other end, electrochemical capacitor C4 positive pole and power supply output cathode end VOUT+ connections, electrochemical capacitor C4 negative pole, diode D6 positive pole are connected with ground terminal VGND.

Especially, the field-effect transistor Q3 and field-effect transistor Q4 use N-channel MOS pipe.

Compared with traditional dual input power circuit, the utility model proposes active and standby input power circuit not only realize electricity Source dual input, and the component used is few, and simple in construction, cost is low, and debugging is convenient.

Brief description of the drawings

Fig. 1 is pulse-width modulation circuit structure chart in the active and standby input power circuit that the utility model embodiment provides；

Fig. 2 is primary input circuit structure chart in the active and standby input power circuit that the utility model embodiment provides；

Fig. 3 is standby input circuit structure chart in the active and standby input power circuit that the utility model embodiment provides；

Fig. 4 is power output circuit structure chart in the active and standby input power circuit that the utility model embodiment provides.

Embodiment

For the ease of understanding the utility model, the utility model is more fully retouched below with reference to relevant drawings State.Preferred embodiment of the present utility model is given in accompanying drawing.But the utility model can come in fact in many different forms It is existing, however it is not limited to embodiment described herein.On the contrary, the purpose for providing these embodiments is made to public affairs of the present utility model Open the more thorough and comprehensive of content understanding.It should be noted that when an element is considered as " connection " another element, it can To be directly to another element or may be simultaneously present centering elements.Unless otherwise defined, institute used herein Some technologies and scientific terminology are identical with belonging to the implication that those skilled in the art of the present utility model are generally understood that.Herein In term used in the description of the present utility model be intended merely to describe specific embodiment purpose, it is not intended that in Limit the utility model.

Active and standby input power circuit specifically includes pulse-width modulation circuit, primary input circuit, standby input in the present embodiment Circuit and power output circuit.As shown in figure 1, the pulse-width modulation circuit includes resistance R1, resistance R2, electric capacity C1, three poles Pipe Q1, triode Q2 and driving transformer primary side T1C, the resistance R1 one end connect external power supply end VCC, and the other end connects Triode Q1 colelctor electrode is connect, triode Q1 base stage, triode Q2 base stage are connected with resistance R2 one end, and resistance R2's is another One termination pulse-width signal PWM, triode Q1 emitter stage, triode Q2 emitter stage are connected drive after being concatenated with electric capacity C1 Dynamic transformer primary side T1C one end, triode Q2 colelctor electrode, the driving transformer primary side T1C other end and ground terminal GND connect Connect.As shown in Fig. 2 the primary input circuit includes resistance R3, resistance R4, diode D1, diode D2, resistance R5, field effect Answer transistor Q3, the driving transformer secondary T1A and main transformer primary side T2A, the resistance R3 one end and resistance R4's One end, driving transformer secondary T1A one end connection, the resistance R4 other end are connected with diode D1 negative pole, diode D1 Positive pole be connected with the resistance R3 other end, resistance R5 one end, field-effect transistor Q3 grid, the resistance R5 other end with The driving transformer secondary T1A other end, electric capacity C2 one end, field-effect transistor Q3 source electrode, primary input negative pole end DC1VIN- connections, the electric capacity C2 other end are connected with one end of diode D2 negative pole, main transformer primary side T2A, diode D2 positive pole connection primary input positive terminal DC1VIN+, field-effect transistor Q3 drain electrode are another with main transformer primary side T2A's End connection.

As shown in figure 3, the standby input circuit includes resistance R6, resistance R7, diode D3, diode D4, resistance R8, field-effect transistor Q4, the driving transformer secondary T1B and main transformer primary side T2B, one end of the resistance R6 with Resistance R7 one end, driving transformer secondary T1B one end connection, the resistance R7 other end are connected with diode D3 negative pole, Diode D3 positive pole is connected with the resistance R6 other end, resistance R8 one end, field-effect transistor Q4 grid, resistance R8's The other end and the driving transformer secondary T1B other end, electric capacity C3 one end, field-effect transistor Q4 source electrode, primary input Negative pole end DC2VIN- connections, the electric capacity C3 other end are connected with one end of diode D4 negative pole, main transformer primary side T2B, Diode D4 positive pole connects primary input positive terminal DC2VIN+, field-effect transistor Q4 drain electrode and main transformer primary side T2B other end connection.As shown in figure 4, the power output circuit includes main transformer secondary T2C, diode D5, diode D6, inductance L1 and electrochemical capacitor C4, the diode D5 positive pole connection main transformer secondary T2C one end, the diode The D6 positive pole connection main transformer secondary T2C other end, diode D5 negative pole, diode D6 negative pole and the one of inductance L1 End connection, the inductance L1 other end, electrochemical capacitor C4 positive pole are connected with power supply output cathode end VOUT+, electrochemical capacitor C4's Negative pole, diode D6 positive pole are connected with ground terminal VGND.

The field-effect transistor Q3 and field-effect transistor Q4 use N-channel MOS pipe in the present embodiment.Pass through The external power supply end VCC provides a stable operating voltage for pulse-width modulation circuit.Triode Q1 and triode Q2 compositions One totem output, exports a stable pulse-width signal PWM and acts on driving transformer primary side T1C, secondary T1A, secondary T1B, produce stable driving voltage and go to drive field-effect transistor Q3 and field-effect transistor Q4.Main transformer is former Side T2A, primary side T2B will produce exciting current, and then main transformer secondary T2C produces induced electromotive force, by diode D5, Diode D6, inductance L1 and electrochemical capacitor C4 carry out the stable voltage powering load of shaping output.DC1VIN, DC2VIN points Wei it is primary input and it is standby input obtained by rectifying and wave-filtering, diode D2, electric capacity C2, diode D4, electric capacity C3 play every From effect so that it is primary input standby input between do not interfere with each other mutually, and DC1VIN, DC2VIN any one have electricity, Output powering load can be stablized.

The technical solution of the utility model not only realizes power supply dual input, and the component used is few, structure letter Single, cost is low, and debugging is convenient.

Pay attention to, above are only preferred embodiment of the present utility model and institute's application technology principle.Those skilled in the art's meeting Understand, the utility model is not limited to specific embodiment described here, can carried out for a person skilled in the art various bright Aobvious change, readjust and substitute without departing from the scope of protection of the utility model.Therefore, although passing through above example The utility model is described in further detail, but the utility model is not limited only to above example, is not departing from In the case that the utility model is conceived, other more equivalent embodiments can also be included, and the scope of the utility model is by appended Right determine.

Claims (2)

1. a kind of active and standby input power circuit, it is characterised in that including pulse-width modulation circuit, primary input circuit, standby input Circuit and power output circuit；The pulse-width modulation circuit includes resistance R1, resistance R2, electric capacity C1, triode Q1, triode Q2 and driving transformer primary side T1C, the resistance R1 one end connect external power supply end VCC, other end connecting triode Q1's Colelctor electrode, triode Q1 base stage, triode Q2 base stage are connected with resistance R2 one end, and resistance R2 another termination pulsewidth is adjusted Signal PWM processed, triode Q1 emitter stage, triode Q2 emitter stage are connected driving transformer primary side after being concatenated with electric capacity C1 T1C one end, triode Q2 colelctor electrode, the driving transformer primary side T1C other end are connected with ground terminal GND；It is described primary defeated Entering circuit includes resistance R3, resistance R4, diode D1, diode D2, resistance R5, field-effect transistor Q3, the driving transformation Device secondary T1A and main transformer primary side T2A, one end of the resistance R3 and resistance R4 one end, driving transformer secondary T1A One end is connected, and the resistance R4 other end is connected with diode D1 negative pole, diode D1 positive pole and resistance the R3 other end, electricity Hinder the grid connection of R5 one end, field-effect transistor Q3, the resistance R5 other end is another with driving transformer secondary T1A's End, electric capacity C2 one end, field-effect transistor Q3 source electrode, primary input negative pole end DC1VIN- connections, the electric capacity C2 other end Negative pole, main transformer primary side T2A one end with diode D2 are connected, and diode D2 positive pole connects primary input positive terminal DC1VIN+, field-effect transistor Q3 drain electrode are connected with the main transformer primary side T2A other end；The standby input circuit bag Include resistance R6, resistance R7, diode D3, diode D4, resistance R8, field-effect transistor Q4, the driving transformer secondary T1B And main transformer primary side T2B, one end of the resistance R6 are connected with one end of resistance R7 one end, driving transformer secondary T1B, The resistance R7 other end is connected with diode D3 negative pole, diode D3 positive pole and the resistance R6 other end, the one of resistance R8 End, field-effect transistor Q4 grid connection, the resistance R8 other end and driving transformer secondary the T1B other end, electric capacity C3 One end, field-effect transistor Q4 source electrode, primary input negative pole end DC2VIN- connections, electric capacity the C3 other end and diode D4 Negative pole, main transformer primary side T2B one end connection, diode D4 positive pole connects primary input positive terminal DC2VIN+, and field is imitated Transistor Q4 drain electrode is answered to be connected with the main transformer primary side T2B other end；The power output circuit includes main transformer pair Side T2C, diode D5, diode D6, inductance L1 and electrochemical capacitor C4, the diode D5 positive pole connection main transformer secondary T2C one end, the positive pole connection main transformer secondary T2C of the diode D6 other end, diode D5 negative pole, diode D6 negative pole is connected with inductance L1 one end, the inductance L1 other end, electrochemical capacitor C4 positive pole and power supply output cathode end VOUT+ connections, electrochemical capacitor C4 negative pole, diode D6 positive pole are connected with ground terminal VGND.

2. active and standby input power circuit according to claim 1, it is characterised in that the field-effect transistor Q3 and field effect Transistor Q4 is answered to use N-channel MOS pipe.