CN201414082Y - Power supply - Google Patents
Power supply Download PDFInfo
- Publication number
- CN201414082Y CN201414082Y CN2009201506320U CN200920150632U CN201414082Y CN 201414082 Y CN201414082 Y CN 201414082Y CN 2009201506320 U CN2009201506320 U CN 2009201506320U CN 200920150632 U CN200920150632 U CN 200920150632U CN 201414082 Y CN201414082 Y CN 201414082Y
- Authority
- CN
- China
- Prior art keywords
- output
- power supply
- converter
- switch
- power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The utility model provides a power supply, comprising an AC-DC converter, a DC-DC converter and a control circuit. The AS-DC converter converts an input alternating current power supply into direct current voltage which is output by the output end. When the power supply works normally, the DC-DC converter converts direct current voltage into an output direct current power supply by switching of apower switch, and does not actuate when the power supply is in standby mode. The control circuit is coupled to the output end of the AC-DC converter and the power switch and is provided with a pulse width modulation controller, a start resistor and a switch circuit; the start resistor and the switch circuit are coupled between the output end of the AC-DC converter and the pulse width modulation controller in series; when the power supply works normally, the switch circuit is connected so as to lead the direct current voltage to start the pulse width modulation controller for actuation by the start resistor, while the power supply is in standby mode, the switch circuit is disconnected, therefore, the standby power consumption can be reduced.
Description
Technical field
The utility model relates to a kind of power supply unit, relates in particular to a kind of power supply unit with standby mode.
Background technology
When electric equipment products connected AC power, the power loss of electric equipment products under normal mode of operation (on mode), sleep pattern (sleep mode), standby mode (stand-by mode) or shutdown mode (off mode) must meet the ordered standard of linked groups.Because the phenomenon of energy shortage and global warming is on the rise, relevant standard has more and more stricter trend, for example, become and be lower than 0.5W by originally the 1W that is lower than for the standard of the power loss (or being called stand-by power consumption) of electric equipment products under standby mode, and begin to have the market demands that are lower than 0.3W or even 0.1W to occur.
Fig. 1 is a kind of existing circuit diagram that is applied to the power supply unit of electric equipment products.Please refer to Fig. 1; power supply unit 1 comprises protective circuit 11, electromagnetic interference (ElectroMagnetic Interference; abbreviation EMI) filter 12, AC to DC converter 13, DC-DC converter 14 and control circuit 15 use for electric equipment products in order to receive AC power Vac and to be converted into output DC source Vo.Power supply unit 1 also comprises alternating-current switch 16, under the situation of not pulling out AC power Vac, can manually control alternating-current switch 16 disconnections and do not allow AC power Vac import when the user does not use electric equipment products, to reduce power loss.
Wherein, protective circuit 11 comprises fuse F1 and thermistor NTC1, protects factors such as power supply unit 1 internal circuit avoids being struck by lightning, shove to destroy.Electromagnetic interface filter 12 comprises safety capacitor CX1 and common mode choke coil LF1, and the electromagnetic interference among the filtering AC power Vac prevents that simultaneously the electromagnetic interference of power supply unit 1 generation from polluting the public electric wire net that AC power Vac is provided by power line.AC to DC converter 13 comprises bridge rectifier BD1 and capacitor C1, and AC power Vac voltage is pulsating dc voltage by bridge rectifier BD1 rectification, is filtered into the less direct voltage Vdc of voltage ripple by capacitor C1 again.DC-DC converter 14 adopts flyback (flyback) framework, it comprises transformer T1, power switch Q1, diode D3, capacitor C4 and the filter that is made of inductor L1 and capacitor C5, when power switch Q1 conducting, diode D3 ends, the elementary winding NP of transformer T1 stores the energy of direct voltage Vdc input, uses to electric equipment products and powered by output DC source Vo by the previous energy stored of capacitor C4; When power switch Q1 disconnects, diode D3 conducting, the previous energy stored of the elementary winding NP of transformer T1 is sent to transformer T1 secondary winding NS, except using to electric equipment products also powering by output DC source Vo the capacitor C4 charging.DC-DC converter 14 also comprises the clamp element that is made of resistor R 3, capacitor C3 and diode D2, and limiting transformer T1 leakage inductance is caused voltage spine on power switch Q1.
The control circuit 15 of DC-DC converter 14 comprises pulse-width modulation (Pulse Width Modulation, abbreviate PWM as) controller IC 1, it has power end VCC, earth terminal GND, sensor ends CS and output OUT, power end VCC is coupled to the auxiliary winding NA by transformer T1, resistor R 2, the accessory power supply that diode D1 and capacitor C2 constitute, power end VCC also is coupled to the output of AC to DC converter 13 by startup resistor R1, earth terminal GND ground connection, sensor ends CS is coupled to resistor R 4 and flows through power switch Q1 size of current by resistor R 4 detections, and output OUT is coupled to power switch Q1 by resistor R 5.On the output of AC to DC converter 13, produce the moment of direct voltage Vdc, direct voltage Vdc sends into PWM controller IC 1 power end VCC by startup resistor R1 makes PWM controller IC 1 begin to move and the switching of power controlling switch Q1, and then makes transformer T1 set up the accessory power supply stable power-supplying to PWM controller IC 1.After this PWM controller IC 1 flows through power switch Q1 size of current according to what receive from sensor ends CS, adjusts the switching of feedbacking power controlling switch Q1 from the pwm control signal of output OUT output.
Fig. 2 is the another kind of existing circuit diagram that is applied to the power supply unit of electric equipment products.Please refer to Fig. 2, power supply unit 2 substitutes the alternating-current switch 16 in the power supply unit 1 shown in Figure 1 with relay (relay) 26, and relay 26 is configured between electromagnetic interface filter 12 and the AC to DC converter 13, also add another group AC to DC converter 23, DC-DC converter 24 and control circuit 25 simultaneously, it is converted to standby DC power supply Vsb with AC power Vac and gives microcontroller (Micro Controller Unit abbreviates MCU as) with continued power.Wherein AC to DC converter 23, DC-DC converter 24 and control circuit 25 circuit frameworks can adopt the circuit framework identical with AC to DC converter 13, DC-DC converter 14 and control circuit 15.
After power supply unit 2 connects AC power Vac, the user can send triggering signal by the power knob of pushing on the remote controller (or electric equipment products control panel), MCU is out-put supply start signal ON or power-off signal OFF when receiving triggering signal, to control power supply unit 2 (or electric equipment products) operate as normal accordingly or to be in standby mode.In the present embodiment, power supply unit 2 is sent to low-pressure side with electric power starting signal ON or power-off signal OFF from the high-pressure side by isolating switch OC1, control its switch SW 1 conducting or disconnection to drive relay 26 coil LS1, and then control power supply unit 2 (or electric equipment products) operate as normal or be in standby mode, wherein isolating switch OC1 is an optical coupler, and it comprises LED P D1 and optotransistor PT1.
When power supply unit 2 receives electric power starting signal ON, switch Q21 conducting, make from direct voltage+5V, resistor R 22, diode D22, LED P D1, switch Q21 is a path to ground, LED P D1 is luminous because of there being electric current to flow through, the light conducting that optotransistor PT1 sends because of detecting LED P D1, and then make from accessory power supply, diode D21, coil LS1, optotransistor PT1 also is a path to ground, coil LS1 produces electromagnetic induction control switch SW1 conducting because of electric current flows through, so power supply unit 2 can provide output DC source Vo to use for electric equipment products.When power supply unit 2 receives power-off signal OFF, switch Q21 disconnects, make from direct voltage+5V, resistor R 22, diode D22, LED P D1, switch Q21 to ground for opening circuit, LED P D1 is not luminous because of there not being electric current to flow through, optotransistor PT1 does not disconnect because of detecting light, and then make from accessory power supply, diode D21, coil LS1, optotransistor PT1 to ground also for opening circuit, coil LS1 does not produce electromagnetic induction control switch SW1 disconnection because of there being electric current to flow through, so power supply unit 2 can not provide output DC source Vo to use for electric equipment products.
But power supply unit 1 shown in Figure 1 must the user manually be controlled alternating-current switch 16 conductings or disconnection, and is considerably inconvenient in the use, and power supply unit shown in Figure 22 is easy to generate the sound of mechanical action when relay 26 switch SW 1 are switched.Moreover, the switch of alternating-current switch 16 and relay 26 all is to adopt the mechanical action mode, when make and break contact cuts off AC power Vac, the mode of its mechanical action is to be easy to generate very much electric arc, and the nominal operation temperature of alternating-current switch 16 and relay 26 is low, makes life-span of power supply unit 1 and 2 and reliability step-down and part cost an arm and a leg.
Summary of the invention
The purpose of this utility model is to propose a kind of power supply unit with standby mode, can reduce stand-by power consumption, but do not have aforementioned existing power supply supply use inconvenience, easily produce the sound, easily produce the low and expensive problem of part of electric arc, life-span and reliability.
In order to achieve the above object, the utility model proposes a kind of power supply unit, operate as normal and be in standby mode when receiving the power-off signal when receiving the electric power starting signal, it comprises an AC to DC converter, flow to a direct current transducer and a control circuit always.Described AC to DC converter has input and output, after the input of described AC to DC converter receives an AC power, AC power is converted to a direct current voltage and in the output of the output of described AC to DC converter.Described DC-DC converter has input and output, the input of described DC-DC converter is coupled to the output of described AC to DC converter, switching by a power switch when the power supply unit operate as normal is converted at least one output DC source with direct voltage and in the output output of described DC-DC converter, and is failure to actuate when power supply unit is in standby mode.Described control circuit is coupled to output and the described power switch that exchanges to described direct current transducer, described control circuit has a PWM controller, a startup resistor and a switching circuit, described startup resistor and described switching circuit coupled in series are between the output and described PWM controller of described AC to DC converter, switching circuit conducting when the power supply unit operate as normal, make direct voltage start described PWM controller action, and switching circuit disconnect when power supply unit is in standby mode by startup resistor.
Compared with prior art, the utility model adds switching circuit because of adopting between the control circuit of the output of AC to DC converter and DC-DC converter, when the power supply unit operate as normal, make the switching circuit conducting, make the control circuit action and control the DC-DC converter action so that direct voltage is converted at least one output DC source, and switching circuit is disconnected, control circuit is failure to actuate and controls that DC-DC converter is failure to actuate and no longer output, can reduce stand-by power consumption, but not have aforementioned existing power supply supply and use inconvenience, easily produce the sound, easily produce electric arc, low and the expensive problem of part of life-span and reliability.
For above-mentioned and other purposes, feature and advantage of the present utility model can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 is a kind of existing circuit diagram that is applied to the power supply unit of electric equipment products;
Fig. 2 is the another kind of existing circuit diagram that is applied to the power supply unit of electric equipment products;
Fig. 3 is the circuit diagram of first embodiment of the utility model power supply unit;
Fig. 4 to Fig. 7 is the circuit diagram of second to the 5th embodiment of the utility model power supply unit.
Description of reference numerals: 1～7-power supply unit; 11,31-protective circuit; 12,32-electromagnetic interference (EMI) filter; 13,23,33-AC to DC converter; 14,24,34-DC-DC converter; 15,25,35,45,55,65,75-control circuit; The 16-alternating-current switch; 26, RL2-relay; The switch of SW1, SW2-relay; The coil of LS1, LS2-relay; BD1, BD11-bridge rectifier; C1～C5, C11～C15, C21, CX1-capacitor; D1～D3, D11～D13, D21～D24-diode; The F1-fuse; IC1, IC11-pulse-width modulation (PWM) controller; L1, L11-inductor; The LF1-common mode choke coil; The NTC1-thermistor; OC1～OC3-optical coupler; PD1～PD3-light-emitting diode; PT1, PT2-optotransistor; The PT3-Photo Thyristor; Q1, Q11-power switch; Q21, Q22, Q23-switch; The R1-startup resistor; R2～R5, R11～R15, R21～R24-resistor; T1, T11-transformer; The elementary winding of NP-; The NS-secondary winding; NA-assists winding; The T2-pulse transformer; NH-high-pressure side winding; NL-low-pressure side winding; The ZD1-Zener diode; The VCC-power end; The GND-earth terminal; The CS-sensor ends; The OUT-output; The Vac-AC power; The Vdc-direct voltage; Vsb-standby DC power supply; Vo-output DC source; OFF-power-off signal; ON-electric power starting signal.
Embodiment
Fig. 3 is the circuit diagram of first embodiment of the utility model power supply unit.Please refer to Fig. 3; power supply unit 3 comprises protective circuit 31, electromagnetic interface filter 32, AC to DC converter 33, AC to DC converter 34 and control circuit 35; power supply unit 3 is operate as normal when receiving electric power starting signal ON, and is in standby mode when receiving power-off signal OFF.AC to DC converter 33 has input and output; the input of AC to DC converter 33 receives AC power Vac by protective circuit 31 and electromagnetic interface filter 32, and AC to DC converter 33 is converted to direct voltage Vdc with AC power Vac and exports at the output of AC to DC converter 33.DC-DC converter 34 has input and output, the input of DC-DC converter 34 is coupled to the output of AC to DC converter 33, DC-DC converter 34 switching by power switch Q1 when power supply unit 3 operate as normal is converted at least one output DC source Vo with direct voltage Vdc and in the output output of DC-DC converter 34, and is failure to actuate when power supply unit 3 is in standby mode.Control circuit 35 is coupled to the output and the power switch Q1 of AC to DC converter 33, control circuit 35 has PWM controller IC 1, startup resistor R1 and switching circuit, startup resistor R1 and switching circuit coupled in series are between the output and PWM controller IC 1 of AC to DC converter 33, switching circuit conducting when power supply unit 3 operate as normal, make direct voltage Vdc start 1 action of PWM controller IC, and switching circuit disconnect when power supply unit 3 is in standby mode by startup resistor R1.
In the present embodiment; protective circuit 31, electromagnetic interface filter 32, AC to DC converter 33 and DC-DC converter 34 circuit frameworks adopt the circuit framework identical with protective circuit 11 shown in Fig. 1 (or Fig. 2), electromagnetic interface filter 12, AC to DC converter 13 and DC-DC converter 14, but its execution mode is not limited in this.Use in the circuit diagram shown in Figure 3 with shown in Fig. 1 (or Fig. 2) in the circuit diagram components identical symbolic representation be components identical, do not repeat them here its circuit framework and function.Control circuit 35 comprises PWM controller IC 1, it has power end VCC, earth terminal GND, sensor ends CS and output OUT, power end VCC is coupled to the auxiliary winding NA by transformer T1 by switching circuit, resistor R 2, the accessory power supply that diode D1 and capacitor C2 constitute, power end VCC also is coupled to the output of AC to DC converter 33 by switching circuit and startup resistor R1, earth terminal GND ground connection, sensor ends CS is coupled to resistor R 4 and flows through power switch Q1 size of current by resistor R 4 detections, and output OUT is coupled to power switch Q1 by resistor R 5.Wherein, switching circuit comprises isolating switch OC2, and isolating switch OC2 is that optical coupler comprises light-emitting device PD2 and checkout gear PT2, and in this example, light-emitting device PD2 is a light-emitting diode, and checkout gear PT2 is an optotransistor, but is not limited in this.LED P D2 is luminous and not luminous for responding power-off signal OFF for responding electric power starting signal ON.Optotransistor PT2 and startup resistor R1 coupled in series are between the output and PWM controller IC 1 power end VCC of AC to DC converter 33, and optotransistor PT2 is for responding the luminous conducting of LED P D2 and being not luminous disconnection of response LED P D2.Collector electrode is to launching voltage across poles VCEO representative value 35～70V when open base for general as shown in Figure 2 its optotransistor of optical coupler OC1 PT1, and its optotransistor of optical coupler OC2 PT2 shown in Figure 3 collector electrode when open base must can tolerate the 500V high pressure to launching voltage across poles VCEO.
When power supply unit 3 receives the electric power starting signal ON of MCU output and during operate as normal, switch Q21 conducting, make from direct voltage+5V, resistor R 22, diode D22, LED P D2, switch Q21 is a path to ground, LED P D2 is luminous because of there being electric current to flow through, the light conducting that optotransistor PT2 sends because of detecting LED P D2, and then make from the output of AC to DC converter 33, startup resistor R1, optotransistor PT2 also is a path to PWM controller IC 1 power end VCC, therefore on the output of AC to DC converter 33, produce the moment of direct voltage Vdc, direct voltage Vdc can send into PWM controller IC 1 power end VCC by startup resistor R1 makes PWM controller IC 1 begin to move and the switching of power controlling switch Q1, and then making transformer T1 set up the accessory power supply stable power-supplying to PWM controller IC 1, then can control AC to DC converter 34 after PWM controller IC 1 starts provides output DC source Vo to use for electric equipment products.When power supply unit 3 receives the power-off signal OFF of MCU output and when being in standby mode, switch Q21 disconnects, make from direct voltage+5V, resistor R 22, diode D22, LED P D2, switch Q21 to ground for opening circuit, LED P D2 is not luminous because of there not being electric current to flow through, optotransistor PT2 does not disconnect because of detecting light, and then make from the output of AC to DC converter 33, startup resistor R1, optotransistor PT2 to PWM controller IC 1 power end VCC also for opening circuit, therefore the direct voltage Vdc that produces on the output of AC to DC converter 33 can't deliver to PWM controller IC 1 power end VCC and start PWM controller IC 1, and AC to DC converter 34 is failure to actuate and can not be provided output DC source Vo to use for electric equipment products.
Fig. 4 to Fig. 7 is the circuit diagram of second to the 5th embodiment of the utility model power supply unit.Fig. 4 only is the switching circuit of control circuit to power supply unit shown in Figure 7 and power supply unit shown in Figure 33 differences.Please refer to Fig. 4, the switching circuit of power supply unit 4 control circuits 45 comprises isolating switch OC1, switch Q22 and resistor R 23, and wherein resistor R 23 is in order to set up the operating voltage of the switch Q22 that is made of transistor.Isolating switch OC1 is that optical coupler comprises light-emitting device PD1 and checkout gear PT1, and in this example, light-emitting device PD1 is a light-emitting diode, and checkout gear PT1 is an optotransistor, but is not limited in this.The optotransistor PT1 of optical coupler OC1 is for responding electric power starting signal ON conducting and disconnecting for responding power-off signal OFF.Switch Q22 and startup resistor R1 coupled in series are between the output and PWM controller IC 1 power end VCC of AC to DC converter 33, and switch Q22 disconnects for the optotransistor PT1 conducting conducting of responding optical coupler OC1 and for the optotransistor PT1 that responds optical coupler OC1.Power supply unit 4 is because make into to be coupled between the output and PWM controller IC 1 power end VCC of AC to DC converter 33 with switch Q22, therefore need not use the optical coupler OC2 of the optotransistor PT2 that has high VCEO as shown in Figure 3, and only need use general as shown in Figure 2 optical coupler OC1.
Please refer to Fig. 5, the switching circuit of power supply unit 5 control circuits 55 comprises isolating switch OC3.Isolating switch OC3 is that optical coupler comprises light-emitting device PD3 and checkout gear PT3, and in this example, light-emitting device PD3 is a light-emitting diode, and checkout gear PT3 is a Photo Thyristor, but is not limited in this.LED P D3 is luminous and not luminous for responding power-off signal OFF for responding electric power starting signal ON.Photo Thyristor PT3 for example is unidirectional thyristor (thyristor) or two-way thyristor (triac), be coupled between the output and PWM controller IC 1 power end VCC of AC to DC converter 33, by detecting light that LED P D3 sends and conducting or do not detect light and disconnect.
Please refer to Fig. 6, the switching circuit of power supply unit 6 control circuits 65 comprises relay R L2, and wherein relay R L2 comprises switch SW 2 and coil LS2.Switch SW 2 is coupled between the output and PWM controller IC 1 power end VCC of AC to DC converter 33.When power supply unit 6 received electric power starting signal ON, coil LS2 produced electromagnetic induction control switch SW2 conducting because of there being electric current to flow through, and promptly coil LS2 is for responding electric power starting signal ON control switch SW2 conducting.When power supply unit 6 received power-off signal OFF, coil LS2 did not produce electromagnetic induction control switch SW2 disconnection because of there being electric current to flow through, and promptly coil LS2 responds power-off signal OFF control switch SW2 to disconnect.
Please refer to Fig. 7, rectifier filter and switch Q23 that the switching circuit of power supply unit 7 control circuits 75 comprises pulse transformer T2, is made of diode D23 and capacitor C21.Pulse transformer T2 has high-pressure side winding NH and low-pressure side winding NL, and high-pressure side winding NH receives electric power starting signal ON or power-off signal OFF, and low-pressure side winding NL is coupled to the rectifier filter that is made of diode D23 and capacitor C21.Rectifier filter output also couples the usefulness of Zener diode (zener diode) ZD1 as voltage stabilizing, and is coupled to switch Q23 with control switch Q23 conducting or disconnection by resistor R 24.Switch Q23 is coupled between the output and PWM controller IC 1 power end VCC of AC to DC converter 33, for responding correspondingly conducting or disconnection of rectifier filter output.When high-pressure side winding NH receives electric power starting signal ON, make from direct voltage+5V, resistor R 22, diode D22, high-pressure side winding NH, switch Q21 to be path to ground, high-pressure side winding NH transfers the energy to low-pressure side winding NL, low-pressure side winding NL output pulse signal, pulse signal become direct voltage with control switch Q23 conducting by the rectification and the filtering of rectifier filter again.When high-pressure side winding NH receives power-off signal OFF, make from direct voltage+5V, resistor R 22, diode D22, high-pressure side winding NH, switch Q21 to ground to opening circuit, high-pressure side winding NH can't transfer the energy to low-pressure side winding NL, low-pressure side winding NL is output signal not, so switch Q23 disconnects.
In sum, the utility model power supply unit adopts between the control circuit of the output of AC to DC converter and DC-DC converter and adds switching circuit, when the power supply unit operate as normal, make the switching circuit conducting, make the control circuit action and control the DC-DC converter action so that direct voltage is converted at least one output DC source, and switching circuit is disconnected, control circuit is failure to actuate and controls that DC-DC converter is failure to actuate and no longer output, can reduce stand-by power consumption, but not have aforementioned existing power supply supply and use inconvenience, easily produce the sound, easily produce electric arc, low and the expensive problem of part of life-span and reliability.
Though the utility model discloses as above with preferred embodiment; right its is not in order to limit the utility model; any those of ordinary skills; in not breaking away from spirit and scope of the present utility model; when doing a little change and retouching, therefore protection range of the present utility model is as the criterion when looking accompanying the claim person of defining.
Claims (7)
1, a kind of power supply unit is characterized in that, its operate as normal and when receiving a power-off signal, be in standby mode when receiving an electric power starting signal, and described power supply unit comprises:
One AC to DC converter has input and output, after the input of described AC to DC converter receives an AC power, described AC power is converted to a direct current voltage and in the output of the output of described AC to DC converter;
Flow to direct current transducer always, have input and output, the input of described DC-DC converter is coupled to the output of described AC to DC converter, switching by a power switch when described power supply unit operate as normal is converted at least one output DC source with described direct voltage and in the output output of described DC-DC converter, and is failure to actuate when described power supply unit is in standby mode; And
One control circuit, be coupled to the output and the described power switch of described AC to DC converter, described control circuit has a PWM controller, one startup resistor and a switching circuit, described startup resistor and described switching circuit coupled in series are between the output and described PWM controller of described AC to DC converter, described switching circuit conducting when described power supply unit operate as normal, make described direct voltage start the action of described PWM controller controlling the switching of described power switch, and described switching circuit disconnect when described power supply unit is in standby mode by described startup resistor.
2, power supply unit as claimed in claim 1 is characterized in that, described switching circuit comprises an isolating switch, and described isolating switch is for responding the conducting of described electric power starting signal and disconnecting for responding described power-off signal.
3, power supply unit as claimed in claim 2, it is characterized in that, described isolating switch comprises an optical coupler, described optical coupler comprises a light-emitting device and a checkout gear, described light-emitting device is luminous and not luminous for responding described power-off signal for responding described electric power starting signal, described checkout gear and described startup resistor coupled in series are between the output and described PWM controller of described AC to DC converter, and described checkout gear is for responding the luminous conducting of described light-emitting device and described light-emitting device is not luminous to be disconnected in order to respond.
4, power supply unit as claimed in claim 3 is characterized in that, described checkout gear comprises an optotransistor, a photodiode or a Photo Thyristor.
5, power supply unit as claimed in claim 1 is characterized in that, described switching circuit comprises:
One isolating switch, described isolating switch is for responding the conducting of described electric power starting signal and disconnecting for responding described power-off signal; And
One switch, described switch and described startup resistor coupled in series are between the output and described PWM controller of described AC to DC converter, and described switch is for responding described isolating switch conducting conducting and disconnecting for responding described isolating switch.
6, power supply unit as claimed in claim 1, it is characterized in that, described isolating switch comprises a relay, described relay comprises a switch and a coil, described switch is coupled between the output and described PWM controller of described AC to DC converter, and described coil is controlled described switch conduction and controlled described switch disconnection for responding described power-off signal for responding described electric power starting signal.
7, power supply unit as claimed in claim 1 is characterized in that, described switching circuit comprises:
One pulse transformer, have a high-pressure side winding and a low-pressure side winding, when described high-pressure side winding received described electric power starting signal, described low-pressure side winding was exported a pulse signal, when described high-pressure side winding received described power-off signal, described low-pressure side winding is output signal not;
One rectifier filter is coupled to described low-pressure side winding, and rectification and filtering are carried out in the output of described low-pressure side winding; And
One switch is coupled between the output and described PWM controller of described AC to DC converter, for responding correspondingly conducting or disconnection of described rectifier filter output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201506320U CN201414082Y (en) | 2009-05-05 | 2009-05-05 | Power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201506320U CN201414082Y (en) | 2009-05-05 | 2009-05-05 | Power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201414082Y true CN201414082Y (en) | 2010-02-24 |
Family
ID=41715961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201506320U Expired - Fee Related CN201414082Y (en) | 2009-05-05 | 2009-05-05 | Power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201414082Y (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102074971A (en) * | 2010-12-14 | 2011-05-25 | 东莞市冠佳电子设备有限公司 | Feedback load energy-saving circuit for aging test and control method thereof |
| CN102487243A (en) * | 2010-12-03 | 2012-06-06 | 台达电子工业股份有限公司 | Power supply and power-supply system provided with plurality of power supplies |
| CN102593940A (en) * | 2012-01-19 | 2012-07-18 | 华为技术有限公司 | UPS (Uninterruptible Power Supply) device and working method thereof |
| CN102710148A (en) * | 2012-07-06 | 2012-10-03 | 聚辰半导体(上海)有限公司 | Alternating current-direct current (AC-DC) switching power supply converter |
| CN102780401A (en) * | 2012-07-25 | 2012-11-14 | 深圳市茂宏电气有限公司 | Intelligent control circuit and intelligent control method of switch power supply efficiency |
| CN102904468A (en) * | 2011-07-29 | 2013-01-30 | 兄弟工业株式会社 | Power supply system, imaging device with same, and low-capacity power supply circuit |
| CN103425071A (en) * | 2013-08-16 | 2013-12-04 | 深圳市茂宏电气有限公司 | Switching power energy efficiency control circuit |
| CN106230267A (en) * | 2016-08-29 | 2016-12-14 | 深圳供电局有限公司 | A kind of mobile integrated test power device |
| CN110138226A (en) * | 2019-05-27 | 2019-08-16 | 同济大学 | Constant pressure and flow for submarine observation network inputs changeable DC converter and method |
-
2009
- 2009-05-05 CN CN2009201506320U patent/CN201414082Y/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102487243B (en) * | 2010-12-03 | 2014-05-07 | 台达电子工业股份有限公司 | Power supply and power-supply system provided with plurality of power supplies |
| CN102487243A (en) * | 2010-12-03 | 2012-06-06 | 台达电子工业股份有限公司 | Power supply and power-supply system provided with plurality of power supplies |
| CN102074971A (en) * | 2010-12-14 | 2011-05-25 | 东莞市冠佳电子设备有限公司 | Feedback load energy-saving circuit for aging test and control method thereof |
| CN102074971B (en) * | 2010-12-14 | 2012-12-19 | 东莞市冠佳电子设备有限公司 | Feedback load energy-saving circuit for aging test and control method thereof |
| CN102904468B (en) * | 2011-07-29 | 2017-06-20 | 兄弟工业株式会社 | Power-supply system, the image forming apparatus with the power-supply system and low capacity power circuit |
| CN102904468A (en) * | 2011-07-29 | 2013-01-30 | 兄弟工业株式会社 | Power supply system, imaging device with same, and low-capacity power supply circuit |
| US9130450B2 (en) | 2011-07-29 | 2015-09-08 | Brother Kogyo Kabushiki Kaisha | Power supply system, image forming apparatus having the same, and low-capacity power supply circuit |
| CN102593940A (en) * | 2012-01-19 | 2012-07-18 | 华为技术有限公司 | UPS (Uninterruptible Power Supply) device and working method thereof |
| CN102710148A (en) * | 2012-07-06 | 2012-10-03 | 聚辰半导体(上海)有限公司 | Alternating current-direct current (AC-DC) switching power supply converter |
| CN102780401B (en) * | 2012-07-25 | 2015-05-20 | 深圳市茂宏电气有限公司 | Intelligent control circuit and intelligent control method of switch power supply efficiency |
| CN102780401A (en) * | 2012-07-25 | 2012-11-14 | 深圳市茂宏电气有限公司 | Intelligent control circuit and intelligent control method of switch power supply efficiency |
| CN103425071A (en) * | 2013-08-16 | 2013-12-04 | 深圳市茂宏电气有限公司 | Switching power energy efficiency control circuit |
| CN103425071B (en) * | 2013-08-16 | 2016-08-10 | 深圳市茂宏电气有限公司 | Switching Power Supply energy efficiency control circuit |
| CN106230267A (en) * | 2016-08-29 | 2016-12-14 | 深圳供电局有限公司 | A kind of mobile integrated test power device |
| CN110138226A (en) * | 2019-05-27 | 2019-08-16 | 同济大学 | Constant pressure and flow for submarine observation network inputs changeable DC converter and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201414082Y (en) | Power supply | |
| JP4944562B2 (en) | Switching power supply | |
| US8643222B2 (en) | Power adapter employing a power reducer | |
| US8792257B2 (en) | Power converter with reduced power dissipation | |
| JP3495012B2 (en) | Switching power supply | |
| US9077248B2 (en) | Start-up circuit for a power adapter | |
| TWI497275B (en) | Power supply with low power consumption hiccup standby operation | |
| WO2006072216A1 (en) | A switching power supply with overvoltage protection and its overvoltage protection method | |
| CN101674025B (en) | Multiplexed output auxiliary switch power source powered by commercial power and battery | |
| US20110025289A1 (en) | Two-stage switching power supply | |
| US9030049B2 (en) | Alternating current (AC) to direct current (DC) converter device | |
| KR20120080098A (en) | Switching-mode power supply for lighting of light emitting diode with static current controlling function | |
| CN104242631A (en) | Method and apparatus for implementing a power converter input terminal voltage discharge circuit | |
| JP3173908U (en) | Bisynchronous resonance switching type DC power supply device | |
| CN113224941B (en) | Standby voltage control circuit and switching power supply | |
| CN101277057B (en) | Overload protection delay circuit for switching power supply | |
| JP4748025B2 (en) | Phase control power supply | |
| JP5210419B2 (en) | Switching power supply device and lighting apparatus using the same | |
| CN101945520B (en) | Power switching circuit and controller | |
| JP6155586B2 (en) | Switching power supply | |
| JP2011222267A (en) | Lighting device and lighting apparatus using it | |
| JP2008104275A (en) | Constant current controlled dc-dc converter circuit with function for interrupting no-load oscillation | |
| US10910941B2 (en) | AC/DC converter, luminaire and method providing an improved start-up circuit | |
| TWM364897U (en) | Power supply | |
| TW201027859A (en) | AC adapter and the controlling method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100224 Termination date: 20120505 |