CN106160486B - Power supply device and power source treatment method - Google Patents
Power supply device and power source treatment method Download PDFInfo
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- CN106160486B CN106160486B CN201510207800.5A CN201510207800A CN106160486B CN 106160486 B CN106160486 B CN 106160486B CN 201510207800 A CN201510207800 A CN 201510207800A CN 106160486 B CN106160486 B CN 106160486B
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Abstract
A kind of power supply device and power source treatment method judge the duty cycle of pulse wave width modulation signal to learn the voltage value of alternating voltage when power supply unit is in peak power working condition；If the duty cycle of pulse wave width modulation signal is less than the predetermined work period, the voltage value of alternating voltage is judged as height；At this point, inhibiting the limitation detection voltage of controller of pulse width modulation to protect transistor switch, and power supply unit still can provide load device enough power.Power supply unit does not need any ac voltage detection circuit；The voltage value of alternating voltage be by the duty cycle of judgement pulse wave width modulation signal it can be learnt that.
Description
Technical field
The present invention relates to a kind of feeding mechanism and processing method, in particular to a kind of power supply device and power supply processing side
Method.
Background technique
Power supply unit provides power supply and gives load device, uses driving load device.Some load devices, such as ink jet type
Printer or Hard Disk Drive, when load device starting or the load of load device raising or other special statuss, power supply unit
Peak power (peak power) working condition can be entered to export stronger power briefly to meet the needs of load device.
In general power supply unit, when power supply unit enters peak power working condition, no matter input is handed over
The limitation detection voltage of the size of galvanic electricity pressure (generally between 90 volts~264 volts), controller of pulse width modulation all can be by
It substantially draws high to increase the on-state rate of pulse wave width modulation signal to meet power demand.If but alternating voltage is high (example at this time
Such as 264 volts), then transistor switch will be by the damage of surging (spike).The current practice is to increase protection circuit or make
With the transistor switch more resistant to pressure, but it will so cause the raising of cost.
Summary of the invention
The shortcomings that improve the above-mentioned prior art, the purpose of the present invention is to provide a kind of power supply devices.
The shortcomings that improve the above-mentioned prior art, another object of the present invention is to provide a kind of power source treatment method.
To reach above-mentioned purpose of the invention, power supply device of the invention includes: a controller of pulse width modulation,
With a limitation detection voltage, and export a pulse wave width modulation signal；And a transistor switch, according to the pulse wave width modulation
Signal conduction is not turned on.Wherein when the power supply device is in first working condition, which detects voltage and is equal to one
First voltage.Wherein when a duty cycle of the pulse wave width modulation signal is not less than a predetermined value and the power supply device turn
When shifting to second working condition, the limitation detection voltage of the controller of pulse width modulation is equal to a second voltage；When this
The duty cycle of pulse wave width modulation signal is less than the predetermined value and the power supply device is converted to second working condition
When, the limitation detection voltage of the controller of pulse width modulation is less than the second voltage.
Furthermore power supply device as described above, wherein the power supply device is applied to a load device, electrically connects
It is connected to the power supply device；The power supply device provides a power supply and gives the load device, uses and drives the load device.
Furthermore power supply device as described above, further includes: a transformer, includes a first side winding and one or two times
Side winding, the first side winding are electrically connected to the transistor switch；One secondary side diode, be electrically connected to the secondary side around
Group；And an output capacitor, it is electrically connected to the secondary side diode.Wherein when the transistor switch is connected, the primary side
Winding stores energy, and the primary side current for passing through the first side winding and the transistor switch increases；When the transistor
Switch is when being not turned on, the energy being stored in the transformer can be discharged by the secondary side winding and the secondary side diode to
The output capacitor.
Furthermore power supply device as described above further includes a rectification circuit, it is electrically connected to the first side winding.
Wherein the power supply device is to be applied to an alternating voltage feeding mechanism, is electrically connected to the power supply device；The exchange
Voltage supply device transmits an alternating voltage to the power supply device；The rectifier circuit rectifies alternating voltage is whole to obtain this
Galvanic electricity pressure；The rectification circuit transmits the rectified voltage to the first side winding.
Furthermore power supply device as described above, wherein when the power supply device is in first working condition, it should
Power supply device exports a usual power；When the power supply device is in second working condition, the power supply device
Export a peak power；The peak power is greater than the usual power.
Furthermore power supply device as described above, wherein when load device starting or a load of the load device
When raising, which enters the peak power working condition；The load device can be for example but to be not limited to a horse
Up to type electronic device；The predetermined value can be for example but to be not limited to 33%.
Furthermore power supply device as described above further includes a detection resistance, it is electrically connected to the pulse wave width modulation
Controller and the transistor switch.Wherein the primary side current flows through the detection resistance to generate a detection voltage；The pulse wave is wide
Degree adjusting controller detects the detection voltage；When the detection voltage is greater than limitation detection voltage, the pulse wave width modulation
Controller is not turned on the transistor switch.
Furthermore power supply device as described above, wherein the duty cycle when the pulse wave width modulation signal is less than
When the predetermined value and the power supply device are converted to second working condition, the limitation inspection of the controller of pulse width modulation
It surveys voltage and is equal to the first voltage.
To reach an above-mentioned further object of the invention, power source treatment method of the invention is applied to a power supply unit, should
Power supply unit includes a controller of pulse width modulation and a transistor switch, which exports an arteries and veins
Wave width modulating signal uses conducting or is not turned on the transistor switch, which includes to the transistor switch:
When the power supply unit is in a peak power working condition, which judges that the pulse wave width modulation is believed
Number a duty cycle；And when the power supply unit is in the peak power working condition and controller of pulse width modulation judgement
When the duty cycle of the pulse wave width modulation signal is less than a predetermined work period, controller of pulse width modulation control should
One limitation detection voltage of controller of pulse width modulation limits detection voltage less than a peak value.
Furthermore power source treatment method as described above, wherein the power source treatment method is applied to a load device, electrically connects
It is connected to the power supply unit；The power supply unit provides a power supply and gives the load device, uses and drives the load device.
Furthermore power source treatment method as described above, wherein the power supply unit further includes a transformer；The transformer packet
Containing first side winding and a secondary side winding；The first side winding is electrically connected to the transistor switch；When the transistor switch
When conducting, which stores energy, passes through the first side winding and a primary side current of the transistor switch
Increase.
Furthermore power source treatment method as described above, wherein the power supply unit further includes a secondary side diode and one
Output capacitor；The secondary side diode is electrically connected to the secondary side winding；It is secondary that the output capacitor is electrically connected to this
Side diode；When the transistor switch is not turned on, be stored in an energy in the transformer can by the secondary side winding and
The secondary side diode is discharged to the output capacitor.
Furthermore power source treatment method as described above, wherein the power source treatment method is applied to alternating voltage supply dress
It sets, is electrically connected to the power supply unit；The alternating voltage feeding mechanism transmits an alternating voltage to the power supply unit；The electricity
Source power supply unit further includes a rectification circuit, is electrically connected to the first side winding；The rectifier circuit rectifies alternating voltage is to obtain
To the rectified voltage；The rectification circuit transmits the rectified voltage to the first side winding.
Furthermore power source treatment method as described above, wherein when the power supply unit is in a conventional operational state, the electricity
Source power supply unit exports a usual power；When the power supply unit is in the peak power working condition, which is exported
One peak power；The peak power is greater than the usual power.
Furthermore power source treatment method as described above, wherein when load device starting or a load of the load device
When raising, which enters the peak power working condition；The load device can be for example but to be not limited to a motor
Type electronic device；The predetermined work period can be for example but to be not limited to 33% conducting.
Furthermore power source treatment method as described above, wherein the power supply unit further includes a detection resistance, it is electrically connected
To the controller of pulse width modulation and the transistor switch；The primary side current flows through the detection resistance to generate detection electricity
Pressure；The controller of pulse width modulation detects the detection voltage；When the detection voltage is greater than limitation detection voltage, the arteries and veins
Wave width adjusting controller is not turned on the transistor switch.
Furthermore power source treatment method as described above, further includes: when the power supply unit is in the peak power working condition
And the controller of pulse width modulation judges the duty cycle of the pulse wave width modulation signal not less than the predetermined work period
When, the limitation detection voltage which improves the controller of pulse width modulation is limited as the peak value
Detect voltage.
Furthermore power source treatment method as described above, wherein when the power supply unit is in a conventional operational state, the arteries and veins
The limitation detection voltage of wave width adjusting controller is that a limitation usually detects voltage；When the power supply unit is in the peak work
Rate working condition and the controller of pulse width modulation judge that the duty cycle of the pulse wave width modulation signal is predetermined less than this
When the duty cycle, it is flat for this which keeps the limitation of the controller of pulse width modulation to detect voltage
Often limitation detection voltage.
Effect of the invention is to judge the pulse bandwidth tune when the power supply unit is in the peak power working condition
The duty cycle of varying signal is to learn a voltage value of the alternating voltage；If the duty cycle of the pulse wave width modulation signal
Less than a predetermined value, then the voltage value of the alternating voltage is judged as height；At this point, the pulse wave width modulation is inhibited to control
The limitation detection voltage of device is to protect the transistor switch, and still to provide the load device enough for the power supply unit
Power.The power supply unit does not need any ac voltage detection circuit；The voltage value of the alternating voltage is by judging the pulse wave
Duty cycle of width modulation signal it can be learnt that.
Below in conjunction with the drawings and specific embodiments, the present invention will be described in detail, but not as a limitation of the invention.
Detailed description of the invention
Fig. 1 is power supply device block diagram of the invention；
Fig. 2 is the microcosmic waveform diagram of an embodiment of the both end voltage of the transistor switch；
Fig. 3 is the embodiment waveform diagram for detecting voltage；
Fig. 4 is power source treatment method flow chart of the invention.
Wherein, appended drawing reference
Power supply device 10
Load device 20
Alternating voltage feeding mechanism 30
Alternating voltage 32
Controller of pulse width modulation 102
Transistor switch 104
Transformer 106
Secondary side diode 108
Output capacitor 110
Rectification circuit 112
Detection resistance 114
Rectified voltage 116
Pulse wave width modulation signal 118
Primary side current 120
Power supply 122
Feedback circuit 124
Detect voltage 126
First side winding 10602
Secondary side winding 10604
Step S02~08
Specific embodiment
Detailed description for the present invention and technology contents please refer to detailed description and accompanying drawings below and are described as follows, and
Attached drawing and detailed description as illustrative purposes only, are not intended to limit the present invention.
Referring to FIG. 1, it is power supply device block diagram of the invention, the present embodiment is flyback (Flyback) electricity
Source converter, but invention is not limited thereto.One power supply device 10 is applied to a load device 20 and an alternating voltage supplies
Answer device 30；The power supply device 10 includes a controller of pulse width modulation 102, a transistor switch 104, a transformer
106, a secondary side diode 108, an output capacitor 110, a rectification circuit 112, a detection resistance 114 and a feedback circuit
124.The transformer includes a first side winding 10602 and a secondary side winding 10604.
The load device 20 is electrically connected to the power supply device 10；The alternating voltage feeding mechanism 30 is electrically connected to
The power supply device 10；The transistor switch 104 is electrically connected to the controller of pulse width modulation 102；The primary side around
Group 10602 is electrically connected to the transistor switch 104；The secondary side diode 108 is electrically connected to the secondary side winding
10604；The output capacitor 110 is electrically connected to the secondary side diode 108；The rectification circuit 112 be electrically connected to this one
Secondary side winding 10602；The detection resistance 114 is electrically connected to the controller of pulse width modulation 102 and the transistor switch
104；The feedback circuit 124 is electrically connected to the controller of pulse width modulation 102, the secondary side diode 108 and the output
Hold capacitor 110.
Of the invention is mainly characterized in that there is the controller of pulse width modulation 102 limitation to detect voltage, and defeated
A pulse wave width modulation signal 118 out；The transistor switch 104 is connected or is not turned on according to the pulse wave width modulation signal 118.
When the power supply device 10 is in first working condition, which detects voltage and is equal to a first voltage；When the pulse wave is wide
A duty cycle of modulating signal 118 is spent not less than a predetermined value and the power supply device 10 is converted to one second working condition
When, the limitation detection voltage of the controller of pulse width modulation 102 is equal to a second voltage；When the pulse wave width modulation signal
When 118 duty cycle is less than the predetermined value and the power supply device 10 conversion to second working condition, the pulse wave is wide
The limitation detection voltage for spending adjusting controller 102 is less than the second voltage.The following contents will be described or describe at other angles
The technical characteristics of aforementioned present invention.
The alternating voltage feeding mechanism 30 transmits the rectification circuit of an alternating voltage 32 to the power supply device 10
112；The rectification circuit 112 rectifies the alternating voltage 32 to obtain a rectified voltage 116；The rectification circuit 112 transmits the rectification
Voltage 116 is to the first side winding 10602.The controller of pulse width modulation 102 export the pulse wave width modulation signal 118 to
The transistor switch 104 uses conducting or is not turned on the transistor switch 104.
When the transistor switch 104 conducting when, the first side winding 10602 store energy, pass through the primary side around
One primary side current 120 of group 10602 and the transistor switch 104 increases.When the transistor switch 104 is not turned on, storage
An energy in the transformer 106 can be discharged by the secondary side winding 10604 and the secondary side diode 108 to the output
Hold capacitor 110；The power supply device 10 provides a power supply 122 by the output capacitor 110 and gives the load device 20, uses
Drive the load device 20.
The load device 20 can be for example but to be not limited to a motor type electronic device, such as an ink-jet printer or one
Hard Disk Drive.When the power supply device 10 is at a conventional operational state (the first i.e. above-mentioned working condition), which is supplied
Device 10 exports a usual power；When the load device 20 starting or a load of the load device 20 improve, (or other are special
Situation) when, which is required that entering a peak power (peak power) works by the feedback circuit 124
State (the second i.e. above-mentioned working condition)；When the power supply device 10 is in the peak power working condition, which is supplied
Device 10 is answered to export a peak power；The peak power is greater than the usual power, to meet the starting of the load device 20 or be somebody's turn to do
The load of load device 20 improves (or other special statuss).
The transformer 106 has in leakage inductance (Fig. 1 does not show) and the transistor switch 104 and has parasitic capacitance (Fig. 1 does not show), when
The pulse wave width modulation signal 118 is when closing (off), and it is existing that the leakage inductance of the transformer 106 can generate resonance with parasitic capacitance
As high pressure surging can be generated at 104 both ends of transistor switch, as shown in Figure 2；Referring to FIG. 2, it is the transistor switch
The microcosmic waveform diagram of an embodiment of 104 both end voltage.It can be clear from by above description and Fig. 2, which is low
When (such as 90 volts), when the transistor switch 104 closes (off), both ends cross-pressure is relatively low, even if caused by adding because of leakage inductance
High pressure surging, which can still bear, so that the transistor switch 104 will not damage；If but the alternating voltage
32 be high (such as 264 volts), and when the transistor switch 104 closes (off), both ends cross-pressure is relatively high, at this time plus because of leakage inductance
Caused by high pressure surging, which will be easy to damage because of high pressure.
Assuming that the pressure resistance of the transistor switch 104 is 600 volts；When the alternating voltage 32 is the low and power supply device
10 in the peak power working condition, and the damage which is still not exposed to surging (should or that be no more than
104 pressure resistance of transistor switch)；But when the alternating voltage 32 is the high and power supply device 10 in the peak power working condition
When, which will be subject to the damage (or that cross-pressure is more than 104 pressure resistance of transistor switch) of surging.
The purpose of the present invention is being the high and power supply device 10 in peak power work when the alternating voltage 32
When state, how to protect the transistor switch 104 and be able to satisfy the power demand of the load device 20 again.It is used in the present invention
Method are as follows: when the power supply device 10 is in the peak power working condition, if the alternating voltage 32 is height, inhibit the arteries and veins
Limitation detection voltage (being detailed later) of wave width adjusting controller 102 is to protect the transistor switch 104.
And the present invention does not utilize any voltage detecting circuit to detect the alternating voltage 32；The present invention judges the pulse bandwidth tune
A duty cycle (duty cycle) for varying signal 118 is to learn a voltage value of the alternating voltage 32: if the pulse bandwidth tune
The duty cycle of varying signal 118, then the voltage value of the alternating voltage 32 was determined less than a predetermined value (such as 33%)
For height.
This is because if the voltage value of the alternating voltage 32 is higher, energy is higher, so the duty cycle can get over
It is small；Therefore, judge the duty cycle of the pulse wave width modulation signal 118 it can be learnt that the alternating voltage 32 the voltage value:
If the duty cycle of the pulse wave width modulation signal 118 is less than the predetermined value, the voltage value, that is, quilt of the alternating voltage 32
It is determined as height.Furthermore also in that if the voltage value of the alternating voltage 32 is higher, energy is higher, so energy of the present invention
Enough while the limitation for inhibiting the controller of pulse width modulation 102 detects voltage, moreover it is possible to meet the load device 20
Power demand (or can also utilize other existing methods).
The following contents introduces limitation detection voltage: it is by the controller of pulse width modulation 102 that the limitation, which detects voltage,
Inner setting, the commonly referred to as Vcslimit in the specifications of the controller of pulse width modulation 102, such as 0.8 volt；It should
Limitation detection voltage as overcurrent protection and maximum power limitation usually to use.
The primary side current 120 flows through the detection resistance 114 to generate a detection voltage 126 (in the pulse wave width modulation
Commonly referred to as Vcs in the specifications of controller 102)；The controller of pulse width modulation 102 detects the detection voltage 126；
When the detection voltage 126 is greater than limitation detection voltage, which is not turned on the transistor switch
104。
Referring to FIG. 3, it is the embodiment waveform diagram for detecting voltage.When right by a left side first and second voltage wave
When shape encounters limitation detection voltage, which is not turned on the transistor switch 104；Namely
It says, limitation detection voltage can determine the size of the peak power output of the pulse wave width modulation signal 118 and power supply unit.
In general power supply unit, when power supply unit enters the peak power working condition, no matter the friendship
The size of galvanic electricity pressure 32, limitation detection voltage, which will increase, limits detection voltage (such as 1.1 volts) as a peak value to meet
Power demand, for example, Fig. 3 by a left side right third voltage waveform.If the alternating voltage 32 is height, the transistor switch at this time
104 can be by the damage of surging.
When the present invention enter the peak power working condition when, if the alternating voltage 32 be it is low, because of the transistor switch
104 are still not exposed to the damage of surging, and in order to meet power demand, so limitation detection voltage will increase as the peak value
Limitation detection voltage (the i.e. above-mentioned second voltage)；If but the alternating voltage 32 is height, the present invention can inhibit the limitation to examine
Voltage is surveyed, such as so that limitation detection voltage is less than peak value limitation detection voltage, or keep limitation detection voltage not
Become, hereby details are as follows:
Limitation detection voltage is set to be less than peak value limitation detection voltage:
When the power supply device 10 is in the peak power working condition, which judges
The duty cycle of the pulse wave width modulation signal 118；When the power supply device 10 in the peak power working condition and is somebody's turn to do
Controller of pulse width modulation 102 judges (to represent when the duty cycle of the pulse wave width modulation signal 118 is less than the predetermined value
The alternating voltage 32 is height), which controls the limitation of the controller of pulse width modulation 102
It detects voltage and is less than peak value limitation detection voltage；For example, by a left side, right 4th voltage waveform, limitation detection are electric in Fig. 3
Pressure only increases slightly but limits detection voltage still less than the peak value.
Remain unchanged limitation detection voltage:
When the power supply device 10 is in the conventional operational state, the limitation of the controller of pulse width modulation 102
Detecting voltage is that (limitation i.e. shown in Fig. 3 detects voltage to a usual limitation detection voltage；I.e. above-mentioned first voltage)；When this
Power supply device 10 is in the peak power working condition and the controller of pulse width modulation 102 judges the pulse wave width modulation
(alternating voltage 32 is represented as height) when the duty cycle of signal 118 is less than the predetermined value, the controller of pulse width modulation
102 keep the limitation detection voltage of the controller of pulse width modulation 102 to detect voltage for the usual limitation；For example, in Fig. 3
Right first and second voltage waveform by a left side.
In other words, when the duty cycle of the pulse wave width modulation signal 118 is less than the predetermined value and the power supply is supplied
When the conversion of device 10 is to second working condition, the limitation detection voltage of the controller of pulse width modulation 102 be equal to this
One voltage.
Furthermore the present invention is when the alternating voltage 32 is low:
When the power supply device 10 the peak power working condition and the controller of pulse width modulation 102 judgement should
(it is low for representing the alternating voltage 32), the pulse wave when duty cycle of pulse wave width modulation signal 118 is not less than the predetermined value
The limitation detection voltage that width modulation controller 102 improves the controller of pulse width modulation 102 becomes peak value limitation inspection
Survey voltage；For example, in Fig. 3 by a left side right third voltage waveform.
Effect of the invention is to judge the pulse bandwidth tune when the power supply unit is in the peak power working condition
The duty cycle of varying signal is to learn the voltage value of the alternating voltage；If the duty cycle of the pulse wave width modulation signal
Less than the predetermined value, then the voltage value of the alternating voltage is judged as height；At this point, the pulse wave width modulation is inhibited to control
The limitation detection voltage of device is to protect the transistor switch, and still to provide the load device enough for the power supply unit
Power.The power supply unit does not need any ac voltage detection circuit；The voltage value of the alternating voltage is by judging the pulse wave
Duty cycle of width modulation signal it can be learnt that.
Furthermore the present invention provides a kind of power source treatment method, is applied to a power supply unit, which includes one
Controller of pulse width modulation and a transistor switch, the controller of pulse width modulation export a pulse wave width modulation signal extremely
The transistor switch uses conducting or is not turned on the transistor switch.
The power source treatment method includes: when the power supply unit is in a peak power working condition, the pulse bandwidth tune
Become the duty cycle that controller judges the pulse wave width modulation signal；When the power supply unit is in the peak power working condition
And the controller of pulse width modulation is when judging that the duty cycle of the pulse wave width modulation signal is less than a predetermined work period,
The limitation detection voltage that the controller of pulse width modulation controls the controller of pulse width modulation is limited less than a peak value to be examined
Survey voltage.
Wherein, which is to be applied to a load device, is electrically connected to the power supply unit；The power supply supplies
It answers device to provide a power supply and gives the load device, use and drive the load device.The power supply unit further includes a transformer；The change
Depressor includes first side winding and a secondary side winding；The first side winding is electrically connected to the transistor switch；When the crystal
When pipe switch conduction, which stores energy, and pass through the first side winding and the transistor switch one is primary
Side electric current increases.
Wherein, which further includes a secondary side diode and an output capacitor；The secondary side diode electricity
Property is connected to the secondary side winding；The output capacitor is electrically connected to the secondary side diode；When the transistor switch is not led
When logical, the energy being stored in the transformer can be discharged by the secondary side winding and the secondary side diode to the output end
Capacitor.
Wherein, which is to be applied to an alternating voltage feeding mechanism, is electrically connected to the power supply unit；
The alternating voltage feeding mechanism transmits an alternating voltage to the power supply unit；The power supply unit further includes a rectification circuit,
It is electrically connected to the first side winding；The rectifier circuit rectifies alternating voltage is to obtain the rectified voltage；The rectification circuit passes
Give the rectified voltage to the first side winding.
Wherein, when the power supply unit is in a conventional operational state, which exports a usual power；When this
For power supply unit in the peak power working condition, which exports a peak power；The peak power is greater than should
Usual power.When load device starting or a load of the load device improve, which enters the peak work
Rate working condition；The load device can be for example but to be not limited to a motor type electronic device；The predetermined work period can for
Such as but it is not limited to 33% conducting.
Wherein, which further includes a detection resistance, is electrically connected to the controller of pulse width modulation and is somebody's turn to do
Transistor switch；The primary side current flows through the detection resistance to generate a detection voltage；Controller of pulse width modulation inspection
Measure the detection voltage；When the detection voltage is greater than limitation detection voltage, which is not turned on this
Transistor switch.
Wherein, which further includes: when the power supply unit is in the peak power working condition and the pulse wave
When width modulation controller judges that the duty cycle of the pulse wave width modulation signal is not less than the predetermined work period, the pulse wave
The limitation detection voltage that width modulation controller improves the controller of pulse width modulation becomes peak value limitation detection voltage.
Wherein, when the power supply unit is in a conventional operational state, the limitation of the controller of pulse width modulation is examined
Surveying voltage is that a limitation usually detects voltage；When the power supply unit is in the peak power working condition and the pulse wave width modulation
When controller judges that the duty cycle of the pulse wave width modulation signal is less than the predetermined work period, the pulse wave width modulation control
It is that the usual limitation detects voltage that device processed, which keeps the limitation of the controller of pulse width modulation to detect voltage,.
In conclusion referring to FIG. 4, it is power source treatment method flow chart of the invention.Power supply processing side of the invention
Method mainly comprises the steps of
Step S02: whether in peak power working condition；If it is not, then terminating process；If it is, entering step
S04。
Step S04: whether the duty cycle is less than the predetermined work period；If it is not, then entering step S08；If it is,
Enter step S06.
Step S06: control limitation detection voltage is less than peak value limitation detection voltage, then terminates process.
Step S08: improving limitation detection voltage becomes peak value limitation detection voltage, then terminates process.
Effect of the invention is to judge the pulse bandwidth tune when the power supply unit is in the peak power working condition
The duty cycle of varying signal is to learn the voltage value of the alternating voltage；If the duty cycle of the pulse wave width modulation signal
Less than the predetermined work period, then the voltage value of the alternating voltage is judged as height；At this point, inhibiting the pulse bandwidth tune
Become the limitation detection voltage of controller to protect the transistor switch, and the power supply unit can still provide the load device
Enough power.The power supply unit does not need any ac voltage detection circuit；The voltage value of the alternating voltage is by judging
Duty cycle of the pulse wave width modulation signal it can be learnt that.
Certainly, the present invention can also have other various embodiments, without deviating from the spirit and substance of the present invention, ripe
It knows those skilled in the art and makes various corresponding changes and modifications, but these corresponding changes and change in accordance with the present invention
Shape all should fall within the scope of protection of the appended claims of the present invention.
Claims (16)
1. a kind of power supply device, which is characterized in that the power supply device is applied to an alternating voltage feeding mechanism and one
Load device, the alternating voltage feeding mechanism are electrically connected to the power supply device, which is electrically connected to the electricity
Source supply device, the alternating voltage feeding mechanism transmit an alternating voltage to the power supply device, the power supply device packet
Contain:
There is a limitation to detect voltage, and export a pulse wave width modulation signal for one controller of pulse width modulation；
One transistor switch according to the pulse wave width modulation signal conduction or is not turned on；And
One feedback circuit is electrically connected to the controller of pulse width modulation,
Wherein when the power supply device is in a conventional operational state, which detects voltage and is equal to a first voltage, the electricity
Source supply device exports a usual power；
Wherein when a duty cycle of the pulse wave width modulation signal not less than a predetermined value and the power supply device convert to
When one peak power working condition, the limitation detection voltage of the controller of pulse width modulation is equal to a second voltage；When this
The duty cycle of pulse wave width modulation signal, which is less than the predetermined value, makes a voltage value of the alternating voltage be judged as height, and should
When power supply device is converted to the peak power working condition, the limitation detection voltage of the controller of pulse width modulation is small
In the second voltage, but the power supply device is also able to satisfy a power demand of the load device；The limitation detects voltage
By the controller of pulse width modulation inner setting；
Wherein when load device starting or a load of the load device improve, the power supply device is by feedback electricity
Road is required to enter the peak power working condition；When the power supply device is in the peak power working condition, the power supply
Feeding mechanism exports a peak power；The peak power is greater than the usual power, to meet load device starting or the load
The load of device improves.
2. power supply device according to claim 1, which is characterized in that the power supply device provides a power supply and gives this
Load device is used and drives the load device.
3. power supply device according to claim 1, which is characterized in that further include:
One transformer, includes a first side winding and a secondary side winding, which is electrically connected to the transistor and opens
It closes；
One secondary side diode, is electrically connected to the secondary side winding；And
One output capacitor is electrically connected to the secondary side diode,
Wherein when the transistor switch is connected, which stores energy, passes through the first side winding and the crystalline substance
One primary side current of body pipe switch increases；When the transistor switch is not turned on, the energy meeting that is stored in the transformer
It is discharged by the secondary side winding and the secondary side diode to the output capacitor.
4. power supply device according to claim 3, which is characterized in that further include a rectification circuit, be electrically connected to
The first side winding,
Wherein the rectifier circuit rectifies alternating voltage is to obtain a rectified voltage；The rectification circuit, which transmits the rectified voltage, extremely should
First side winding.
5. power supply device according to claim 2, which is characterized in that the load device is motor type electronics dress
It sets；The predetermined value is 33%.
6. power supply device according to claim 3, which is characterized in that further include a detection resistance, be electrically connected to
The controller of pulse width modulation and the transistor switch,
Wherein the primary side current flows through the detection resistance to generate a detection voltage；The controller of pulse width modulation detects
The detection voltage；When the detection voltage is greater than limitation detection voltage, which is not turned on the crystal
Pipe switch.
7. power supply device according to claim 1, which is characterized in that when the work of the pulse wave width modulation signal
Period is less than the predetermined value and the power supply device when converting to the peak power working condition, pulse wave width modulation control
The limitation detection voltage of device is equal to the first voltage.
8. a kind of power source treatment method, is applied to a power supply unit, which controls comprising a pulse wave width modulation
Device, a transistor switch and a feedback circuit, the feedback circuit are electrically connected to the controller of pulse width modulation, and the pulse wave is wide
It spends adjusting controller and exports a pulse wave width modulation signal to the transistor switch, use conducting or be not turned on the transistor and open
It closes, which is characterized in that the power source treatment method is applied to an alternating voltage feeding mechanism and a load device, which supplies
Device is answered to be electrically connected to the power supply unit, which is electrically connected to the power supply unit, alternating voltage supply
Device transmits an alternating voltage to the power supply unit, which includes:
A. when the power supply unit is in a peak power working condition, which judges the pulse bandwidth
One duty cycle of modulating signal；And
B. when the power supply unit in the peak power working condition and the controller of pulse width modulation judges the pulse bandwidth
When the duty cycle of modulating signal makes a voltage value of the alternating voltage be judged as high less than a predetermined work period, the arteries and veins
The limitation detection voltage that wave width adjusting controller controls the controller of pulse width modulation limits detection electricity less than a peak value
Pressure, but the power supply unit is also able to satisfy a power demand of the load device；It is by the pulse bandwidth that the limitation, which detects voltage,
Adjusting controller inner setting,
Wherein when the power supply unit is in a conventional operational state, which exports a usual power；
Wherein when load device starting or a load of the load device improve, the power supply unit is by the feedback circuit
It is required to enter the peak power working condition；When the power supply unit is in the peak power working condition, which is supplied
Device exports a peak power；The peak power is greater than the usual power, to meet load device starting or the load device
The load improves.
9. power source treatment method according to claim 8, which is characterized in that it is negative that the power supply unit one power supply of offer gives this
It carries and sets, use and drive the load device.
10. power source treatment method according to claim 8, which is characterized in that the power supply unit further includes a transformer；
The transformer includes first side winding and a secondary side winding；The first side winding is electrically connected to the transistor switch；When this
When transistor switch is connected, which stores energy, passes through the first side winding and the one of the transistor switch
Primary side current increases.
11. power source treatment method according to claim 10, which is characterized in that the power supply unit further includes a secondary side
Diode and an output capacitor；The secondary side diode is electrically connected to the secondary side winding；The output capacitor electrically connects
It is connected to the secondary side diode；When the transistor switch is not turned on, be stored in an energy in the transformer can by this two
Secondary side winding and the secondary side diode are discharged to the output capacitor.
12. power source treatment method according to claim 10, which is characterized in that the power supply unit further includes a rectified current
Road is electrically connected to the first side winding；The rectifier circuit rectifies alternating voltage is to obtain a rectified voltage；The rectification circuit
The rectified voltage is transmitted to the first side winding.
13. power source treatment method according to claim 9, which is characterized in that the load device is motor type electronics dress
It sets；The predetermined work period is 33% conducting.
14. power source treatment method according to claim 10, which is characterized in that the power supply unit further includes detection electricity
Resistance, is electrically connected to the controller of pulse width modulation and the transistor switch；The primary side current flow through the detection resistance with
Generate a detection voltage；The controller of pulse width modulation detects the detection voltage；When the detection voltage is examined greater than the limitation
When surveying voltage, which is not turned on the transistor switch.
15. power source treatment method according to claim 8, which is characterized in that further include:
C. when the power supply unit in the peak power working condition and the controller of pulse width modulation judges the pulse bandwidth
When the duty cycle of modulating signal is not less than the predetermined work period, which improves the pulse bandwidth
The limitation detection voltage of adjusting controller becomes peak value limitation detection voltage.
16. power source treatment method according to claim 8, which is characterized in that when the power supply unit is in the conventional operational
When state, the limitation detection voltage of the controller of pulse width modulation is that a limitation usually detects voltage；In step b,
When the power supply unit is in the peak power working condition and the controller of pulse width modulation judges that the pulse wave width modulation is believed
Number the duty cycle be less than the predetermined work period when, the controller of pulse width modulation keep the pulse wave width modulation control
The limitation detection voltage of device is that the usual limitation detects voltage.
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|---|---|
| CN106160486A (en) | 2016-11-23 |
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