CN203800826U - Power supply device with variable switching frequency - Google Patents
Power supply device with variable switching frequency Download PDFInfo
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- CN203800826U CN203800826U CN201420070756.9U CN201420070756U CN203800826U CN 203800826 U CN203800826 U CN 203800826U CN 201420070756 U CN201420070756 U CN 201420070756U CN 203800826 U CN203800826 U CN 203800826U
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- 238000001514 detection method Methods 0.000 claims abstract description 23
- 238000001914 filtration Methods 0.000 claims description 24
- 230000007246 mechanism Effects 0.000 claims description 10
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
Abstract
Provided is a power supply device with variable switching frequency. The power supply device comprises a main transformer, a voltage detection unit, a pulse width modulation control unit and a switch unit. The voltage detection unit is electrically connected with the main transformer. The pulse width modulation control unit is electrically connected with the voltage detection unit. The switch unit is electrically connected with the pulse width modulation control unit and the main transformer. Input voltage of the main transformer is converted into output voltage according to switching frequency of the switch unit; the input voltage is detected by the voltage detection unit and notified to the pulse width modulation control unit; and switching frequency of the switch unit is controlled by the pulse width modulation control unit according to a voltage absolute value of the input voltage.
Description
Technical field
The utility model relates to the power supply device of a kind of power supply device, particularly a kind of changeable switch frequency.
Background technology
Power supply device is a kind of very common electronic installation; Power supply device provides power supply to give outside electronic installation, uses and drives outside electronic installation; Therefore, power supply device is extremely important.
The pulse width modulation controller of the power supply device of correlation technique is to determine the transistor switch of frequency mode control connection transformer; Therefore, when input voltage is low-voltage, effective value electric current and peak electricity fail to be convened for lack of a quorum larger, and the power component of lower resistance to stream can not be used; Many electric energy energy have become heat energy, and transformer easily enters saturation condition and loses inductance characteristic.
Therefore, the efficiency of the power supply device of correlation technique when input voltage is low-voltage is not good.
Utility model content
For improving the shortcoming of above-mentioned prior art, the purpose of this utility model is to provide a kind of power supply device of changeable switch frequency.
For reaching above-mentioned purpose, the utility model provides a kind of power supply device of changeable switch frequency, and it comprises:
One main transformer;
One voltage detection unit, this voltage detection unit is electrically connected to this main transformer;
One pulse width modulation control unit, this pulse width modulation control unit is electrically connected to this voltage detection unit; And
One switch element, this switch element is electrically connected to this pulse width modulation control unit and this main transformer.
The power supply device of above-mentioned changeable switch frequency, is applied to an AC power feeding mechanism and a load device, it is characterized in that, the power supply device of this changeable switch frequency more comprises:
One input filter unit, this input filter unit is electrically connected to this main transformer; And
One input rectifying unit, this input rectifying unit is electrically connected to this input filter unit.
The power supply device of above-mentioned changeable switch frequency, wherein more comprises:
One output rectification unit, this output rectification unit is electrically connected to this main transformer; And
One output filtering unit, this output filtering unit is electrically connected to this output rectification unit and this load device.
The power supply device of above-mentioned changeable switch frequency, wherein more comprises:
One voltage feedback unit, this voltage feedback unit is electrically connected to this output filtering unit, this load device and this pulse width modulation control unit;
One voltage regulation unit, this voltage regulation unit is electrically connected to this main transformer and this pulse width modulation control unit; And
One EMI Filtering unit, this EMI Filtering unit is electrically connected to this AC power feeding mechanism and this input rectifying unit.
The power supply device of above-mentioned changeable switch frequency, wherein this voltage detection unit is a voltage sample circuit.
The power supply device of above-mentioned changeable switch frequency, wherein this pulse width modulation control unit is a pulse width modulation controller, this switch element is a transistor switch, this input filter unit is a filter capacitor, this input rectifying unit is a bridge rectifier, this output rectification unit is a diode, this output filtering unit is a filter capacitor, this voltage feedback unit is a voltage feedback circuit, this voltage regulation unit is a voltage stabilizing circuit, and this EMI Filtering unit is an Electromagnetic interference filter.
Effect of the present utility model is to improve the efficiency of power supply unit when input voltage is low-voltage.
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail, but not as to restriction of the present utility model.
Accompanying drawing explanation
Fig. 1 is the first embodiment block diagram of the power supply device of changeable switch frequency of the present utility model;
Fig. 2 is the second embodiment block diagram of the power supply device of changeable switch frequency of the present utility model.
Wherein, Reference numeral
The power supply device 10 of changeable switch frequency
AC power feeding mechanism 20
Out-put supply 22
Load device 30
Main transformer 102
Voltage detection unit 104
Pulse width modulation control unit 106
Switch element 108
Input voltage 110
Output voltage 112
Input filter unit 114
Input rectifying unit 116
Output rectification unit 118
Output filtering unit 120
Voltage feedback unit 122
Voltage regulation unit 124
EMI Filtering unit 126
Embodiment
Below in conjunction with accompanying drawing, structural principle of the present utility model and operation principle are described in detail:
Please refer to Fig. 1, the first embodiment block diagram of its power supply device that is changeable switch frequency of the present utility model.The power supply device 10 of one changeable switch frequency comprises a main transformer 102, a voltage detection unit 104, a pulse width modulation control unit 106 and a switch element 108.
This voltage detection unit 104 is electrically connected to this main transformer 102; This pulse width modulation control unit 106 is electrically connected to this voltage detection unit 104; This switch element 108 is electrically connected to this pulse width modulation control unit 106 and this main transformer 102.
According to a switching frequency of this switch element 108, these main transformer 102 conversion one input voltages 110 become an output voltage 112; This voltage detection unit 104 detects this input voltage 110 and notifies this pulse width modulation control unit 106; According to an absolute value of voltage of this input voltage 110, this pulse width modulation control unit 106 is controlled this switching frequency of this switch element 108.
At one first specific embodiment, when this absolute value of voltage of this input voltage 110 is greater than the 3rd critical voltage value, this pulse width modulation control unit 106 is controlled this switching frequency of this switch element 108, makes this switching frequency of this switch element 108 become one the 3rd frequency.
When this absolute value of voltage of this input voltage 110 is not more than the 3rd critical voltage value, this pulse width modulation control unit 106 is controlled this switching frequency of this switch element 108, makes this switching frequency of this switch element 108 become one the 4th frequency.
Wherein, the 3rd frequency and the 4th frequency are not identical; The 3rd frequency is less than the 4th frequency.The 3rd critical voltage value for example can be but is not defined as 150 volts; The 3rd frequency for example can be but is not defined as 65KHz; The 4th frequency for example can be but is not defined as 100KHz.
Moreover, at one second specific embodiment, when this absolute value of voltage of this input voltage 110 increases and is greater than first critical voltage value, this pulse width modulation control unit 106 is controlled this switching frequency of this switch element 108, makes this switching frequency of this switch element 108 become a first frequency.
When this absolute value of voltage of this input voltage 110 increases and is not more than this first critical voltage value, this pulse width modulation control unit 106 is controlled this switching frequency of this switch element 108, makes this switching frequency of this switch element 108 constant.
When this absolute value of voltage of this input voltage 110 reduces and is less than second critical voltage value, this pulse width modulation control unit 106 is controlled this switching frequency of this switch element 108, makes this switching frequency of this switch element 108 become a second frequency.
When this absolute value of voltage of this input voltage 110 reduces and is not less than this second critical voltage value, this pulse width modulation control unit 106 is controlled this switching frequency of this switch element 108, makes this switching frequency of this switch element 108 constant.
Wherein, this first critical voltage value and this second critical voltage value are not identical; This first critical voltage value is greater than this second critical voltage value.This first frequency and this second frequency are not identical; This first frequency is less than this second frequency.This first critical voltage value for example can be but is not defined as 160 volts, and this second critical voltage value for example can be but is not defined as 140 volts, and this first frequency for example can be but is not defined as 65KHz, and this second frequency for example can be but is not defined as 100KHz.
The flow process of above-mentioned this second specific embodiment is to be similar to hysteresis effect; By this, this pulse width modulation control unit 106 can avoid changing continually this switching frequency of this switch element 108, therefore can protect the part of the power supply device 10 of this changeable switch frequency.
Please refer to Fig. 2, the second embodiment block diagram of its power supply device that is changeable switch frequency of the present utility model.Element narration shown in Fig. 2 is similar to Fig. 1, for succinct factor, in this, repeats no more.Moreover the power supply device 10 of this changeable switch frequency is to be applied to an AC power feeding mechanism 20 and a load device 30; The power supply device 10 of this changeable switch frequency more comprises an input filter unit 114, an input rectifying unit 116, an output rectification unit 118, an output filtering unit 120, a voltage feedback unit 122, a voltage regulation unit 124 and an EMI Filtering unit 126.
This input filter unit 114 is electrically connected to this main transformer 102; This input rectifying unit 116 is electrically connected to this input filter unit 114; This output rectification unit 18 is electrically connected to this main transformer 102; This output filtering unit 120 is electrically connected to this output rectification unit 118 and this load device 30; This voltage feedback unit 122 is electrically connected to this output filtering unit 120, this load device 30 and this pulse width modulation control unit 106; This voltage regulation unit 124 is electrically connected to this main transformer 102 and this pulse width modulation control unit 106; This EMI Filtering unit 126 is electrically connected to this AC power feeding mechanism 20 and this input rectifying unit 116.
This voltage detection unit 104 for example can be but is not defined as a voltage sample circuit; One out-put supply 22 of this AC power feeding mechanism 20 for example can be but is not defined as between 90 volts to 265 volts; This pulse width modulation control unit 106 for example can be but is not defined as a pulse width modulation controller; This switch element 108 for example can be but is not defined as a transistor switch; This input filter unit 114 for example can be but is not defined as a filter capacitor; This input rectifying unit 116 for example can be but is not defined as a bridge rectifier; This output rectification unit 118 for example can be but is not defined as a diode; This output filtering unit 120 for example can be but is not defined as a filter capacitor; This voltage feedback unit 122 for example can be but is not defined as a voltage feedback circuit; This voltage regulation unit 124 for example can be but is not defined as a voltage stabilizing circuit; This EMI Filtering unit 126 for example can be but is not defined as an Electromagnetic interference filter.
This voltage detection unit 104 shown in Fig. 2 is to be electrically connected to this main transformer 102 and this input filter unit 114, so this voltage detection unit 104 detects this input voltage 110 to obtain this absolute value of voltage of this input voltage 110; Yet, this voltage detection unit 104 also can be electrically connected to this AC power feeding mechanism 20, so this out-put supply 22 that this voltage detection unit 104 detects these AC power feeding mechanisms 20 is to obtain this out-put supply 22 of this input voltage 110() this absolute value of voltage.
Moreover this voltage detection unit 104 also can be electrically connected to this input rectifying unit 116 and this EMI Filtering unit 126, or can be electrically connected to this input rectifying unit 116 and this input filter unit 114.
The utility model comprises following feature (advantage):
1. when this out-put supply 22 of this input voltage 110() this absolute value of voltage when larger, this switching frequency of this switch element 108 is lower; When this out-put supply 22 of this input voltage 110() this absolute value of voltage hour, this switching frequency of this switch element 108 is higher.
2. when this switching frequency of this switch element 108 is higher, can reduce effective value electric current and peak current, can use the power component of lower resistance to stream, magnetic flux can reduce, therefore magnetizing inductance can be strengthened to improve efficiency, or under identical magnetizing inductance, the number of turns of this main transformer 102 can reduce to use less iron core to reduce volume.
3. improve the efficiency of power supply unit when input voltage is low-voltage.
4. the utility model is applicable to continuous conduction mode (continuous conduction mode).
Certainly; the utility model also can have other various embodiments; in the situation that not deviating from the utility model spirit and essence thereof; those of ordinary skill in the art are when making various corresponding changes and distortion according to the utility model, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the utility model.
Claims (6)
1. a power supply device for changeable switch frequency, is characterized in that, comprises:
One main transformer;
One voltage detection unit, this voltage detection unit is electrically connected to this main transformer;
One pulse width modulation control unit, this pulse width modulation control unit is electrically connected to this voltage detection unit; And
One switch element, this switch element is electrically connected to this pulse width modulation control unit and this main transformer.
2. the power supply device of changeable switch frequency according to claim 1, is applied to an AC power feeding mechanism and a load device, it is characterized in that, the power supply device of this changeable switch frequency more comprises:
One input filter unit, this input filter unit is electrically connected to this main transformer; And
One input rectifying unit, this input rectifying unit is electrically connected to this input filter unit.
3. the power supply device of changeable switch frequency according to claim 2, is characterized in that, more comprises:
One output rectification unit, this output rectification unit is electrically connected to this main transformer; And
One output filtering unit, this output filtering unit is electrically connected to this output rectification unit and this load device.
4. the power supply device of changeable switch frequency according to claim 3, is characterized in that, more comprises:
One voltage feedback unit, this voltage feedback unit is electrically connected to this output filtering unit, this load device and this pulse width modulation control unit;
One voltage regulation unit, this voltage regulation unit is electrically connected to this main transformer and this pulse width modulation control unit; And
One EMI Filtering unit, this EMI Filtering unit is electrically connected to this AC power feeding mechanism and this input rectifying unit.
5. the power supply device of changeable switch frequency according to claim 1, is characterized in that, this voltage detection unit is a voltage sample circuit.
6. the power supply device of changeable switch frequency according to claim 5, it is characterized in that, this pulse width modulation control unit is a pulse width modulation controller, this switch element is a transistor switch, this input filter unit is a filter capacitor, this input rectifying unit is a bridge rectifier, this output rectification unit is a diode, this output filtering unit is a filter capacitor, this voltage feedback unit is a voltage feedback circuit, this voltage regulation unit is a voltage stabilizing circuit, and this EMI Filtering unit is an Electromagnetic interference filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420070756.9U CN203800826U (en) | 2014-02-19 | 2014-02-19 | Power supply device with variable switching frequency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420070756.9U CN203800826U (en) | 2014-02-19 | 2014-02-19 | Power supply device with variable switching frequency |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203800826U true CN203800826U (en) | 2014-08-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420070756.9U Expired - Lifetime CN203800826U (en) | 2014-02-19 | 2014-02-19 | Power supply device with variable switching frequency |
Country Status (1)
| Country | Link |
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| CN (1) | CN203800826U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114002608A (en) * | 2021-10-29 | 2022-02-01 | 公牛集团股份有限公司 | Detection method, detection device and detection system for power supply device |
-
2014
- 2014-02-19 CN CN201420070756.9U patent/CN203800826U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114002608A (en) * | 2021-10-29 | 2022-02-01 | 公牛集团股份有限公司 | Detection method, detection device and detection system for power supply device |
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| GR01 | Patent grant | ||
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Granted publication date: 20140827 |
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| CX01 | Expiry of patent term |