TWI570546B - Power supply apparatus with extending hold up time function - Google Patents

Description

Power supply device with extended maintenance time function 【0001】

The present invention relates to a power supply device, and more particularly to a power supply device having an extended maintenance time function.

【0002】

The design of the hold-up time of the power supply is based on the capacitor energy storage formula (1/2) C(V22-V12)=PT, where C is the Bulk capacitor and V2 is the operating voltage. V1 is the cutoff voltage, P is the output power of the power supply, and T is the sustain time. It can be clearly seen from the above formula that in order to effectively improve the maintenance time, the design and development personnel will adopt a method of increasing the value of the storage capacitor, but since the design of the power supply device is increasingly miniaturized, due to the storage capacitor It has a large volume, so the design can not be continued by increasing the storage time value of the storage capacitor value. This problem needs to be improved.

[0003]

In order to improve the above disadvantages of the prior art, it is an object of the present invention to provide a power supply device having an extended maintenance time function.

[0004]

In order to achieve the above object of the present invention, a power supply device having an extended duration function includes: a transformer; a winding switching unit electrically connected to the transformer; and a detecting unit electrically connected to the winding unit. Wherein the transformer comprises: a primary side winding; and a primary side winding, coupled to the primary side winding for induction. The number of turns of the secondary side winding has a turn ratio of the number of turns of the primary side winding; when the detecting unit detects that an input voltage of the primary side winding is less than an input preset voltage, the winding is switched. The unit increases the turns ratio so that an output voltage of the secondary side winding is returned to an output preset voltage.

[0005]

Furthermore, the power supply device having the extended duration function as described above further includes a rectifier electrically connected to the transformer; wherein the detecting unit detects a contact between the AC power terminal and the rectifier Or a junction between the rectifier and the primary side winding, or an output of the power supply having an extended duration function.

[0006]

Furthermore, as described above, the power supply device having the function of extending the hold time, wherein the winding switching unit includes a primary side winding switch electrically connected to the primary side winding and the detecting unit; the transformer is a center tap transformer.

【0007】

Furthermore, as described above, the power supply device has an extended duration function, wherein the detecting unit includes a comparator electrically connected to the winding switching unit.

[0008]

Furthermore, as described above, the power supply device having the extended hold time function, wherein the winding switching unit increases the turn ratio when the detecting unit does not receive any signal for more than a predetermined time.

【0009】

Furthermore, the power supply device having the extended duration function as described above, wherein the secondary side winding comprises: a first secondary side winding electrically connected to the winding switching unit; and a second secondary winding Electrically connected to the winding switching unit and the first secondary winding, wherein the winding switching unit includes a primary side winding switch electrically connected to the first secondary winding, the second secondary winding, and The detection unit.

[0010]

Furthermore, the power supply device having the extended duration function as described above further includes a rectifier electrically connected to the transformer; wherein the detecting unit includes a comparator electrically connected to the winding switching unit.

[0011]

The effect of the present invention is to vary the turns ratio to still have the same hold time when using a small storage capacitor, thereby reducing the size of the power supply.

[0035]

10‧‧‧Power supply unit with extended hold time function

[0036]

20‧‧‧AC power terminal

[0037]

30‧‧‧ Output

[0038]

102‧‧‧Transformers

[0039]

104‧‧‧Wind switching unit

[0040]

106‧‧‧Detection unit

[0041]

108‧‧‧Primary winding

[0042]

110‧‧‧Secondary side winding

[0043]

112‧‧‧Input voltage

[0044]

114‧‧‧Output voltage

[0045]

116‧‧‧Primary side winding switch

[0046]

118‧‧‧First secondary winding

[0047]

120‧‧‧second secondary winding

[0048]

122‧‧‧Secondary side winding switch

[0049]

124‧‧‧Rectifier

[0050]

126‧‧‧ comparator

[0051]

128‧‧‧Second side winding second switch

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a block diagram showing a first embodiment of a power supply device having an extended hold time function of the present invention.

[0013]

2 is a block diagram showing a second embodiment of a power supply device having an extended hold time function of the present invention.

[0014]

Figure 3 is a block diagram showing a third embodiment of a power supply device having an extended hold time function of the present invention.

[0015]

Figure 4 is a block diagram showing a fourth embodiment of a power supply device having an extended hold time function of the present invention.

[0016]

The detailed description and the technical description of the present invention are to be understood as the

[0017]

Please refer to FIG. 1, which is a block diagram of a first embodiment of a power supply device having an extended duration function according to the present invention. A power supply device 10 having an extended duration function includes a transformer 102, a winding switching unit 104, and a detecting unit 106. The winding switching unit 104 is electrically connected to the transformer 102; the detecting unit 106 is electrically connected to the winding switching unit 104.

[0018]

The transformer 102 includes a primary side winding 108 and a primary side winding 110. The primary side winding 108 is electrically coupled to the winding switching unit 104; the secondary side winding 110 is coupled to the primary side winding 108 for induction.

[0019]

The number of turns of the secondary side winding 110 has a turn ratio with the number of turns of the primary side winding 108; when the detecting unit 106 detects that an input voltage 112 of the primary side winding 108 is less than an input preset voltage The winding switching unit 104 increases the turns ratio, thereby returning an output voltage 114 of the secondary side winding 110 to an output preset voltage.

[0020]

The output voltage 114 is equal to the turn ratio multiplied by the input voltage 112; therefore, when the input voltage 112 falls, the turn ratio is changed to maintain the output voltage 114 as the output preset voltage for a predetermined time, This allows the electronic system to perform the necessary storage and control actions to safely shut down.

[0021]

In more detail, it can be seen from the formula: Vo=(Ns/Np)*Vin*D that when D has reached the maximum value, the output voltage can be maintained by adjusting the ratio of turns (ie, Ns/Np). (ie, Vo) voltage. Vo represents the output voltage 114, Ns represents the number of turns of the secondary side winding 110, Np represents the number of turns of the primary side winding 108, Vin represents the input voltage 112, and D represents a primary side transistor switch (not shown in FIG. The duty cycle of the ).

[0022]

Please refer to FIG. 4, which is a block diagram of a fourth embodiment of a power supply device having an extended duration function according to the present invention. The components shown in FIG. 4 are similar to those in FIG. 1 and are for brevity and will not be described again.

[0023]

Please refer to FIG. 2, which is a block diagram of a second embodiment of a power supply device having an extended duration function according to the present invention. The components shown in FIG. 2 are similar to those in FIG. 1 and are for brevity and will not be described again. Moreover, the winding switching unit 104 includes a primary side winding switch 116 electrically connected to the primary side winding 108 and the detecting unit 106; the transformer 102 is a center tapped transformer.

[0024]

Moreover, the power supply device 10 having the extended maintenance time function further includes a rectifier 124 electrically connected to the transformer 102. The detecting unit 106 includes a comparator 126 electrically connected to the winding switching unit 104.

[0025]

The detecting unit 106 detects a contact between the AC power terminal 20 and the rectifier 124, or a contact between the rectifier 124 and the primary side winding 108, or the power supply with an extended duration function. An output 30 of the supply device 10 is provided.

[0026]

In another embodiment, when the detecting unit 106 does not receive any signal for more than a predetermined time (for example, 10 milliseconds), the winding switching unit 104 increases the lap ratio.

[0027]

When the input voltage 112 is not less than the input preset voltage, the comparator 126 controls the primary side winding switch 116 to be connected to the contact on the primary side winding 108 such that the number of turns of the primary side winding 108 is maximum.

[0028]

When the input voltage 112 is less than the input preset voltage, the comparator 126 controls the connection of the primary side winding switch 116 to the middle of the primary side winding 108 such that the number of turns of the primary side winding 108 decreases to approximately the maximum value. Half of this, thereby increasing the ratio of the turns, the output voltage 114 reverting to the output preset voltage.

[0029]

Please refer to FIG. 3, which is a block diagram of a third embodiment of a power supply device having an extended duration function according to the present invention. The components shown in FIG. 3 are similar to those in FIGS. 1 and 2, and are not described herein for brevity. Furthermore, the secondary side winding 110 includes a first secondary side winding 118 and a second secondary side winding 120. The first secondary side winding 118 is electrically connected to the winding switching unit 104 ; the second secondary side winding 120 is electrically connected to the winding switching unit 104 and the first secondary side winding 118 .

[0030]

The winding switching unit 104 includes a primary-stage side winding switch 122 and a primary-stage side winding second switch 128; the secondary-side winding switch 122 is electrically connected to the first secondary-side winding 118 and the second secondary-side winding 120 And the detecting unit 106; the secondary side winding second switch 128 is electrically connected to the first secondary side winding 118, the second secondary side winding 120 and the detecting unit 106.

[0031]

When the input voltage 112 is less than the input preset voltage, the comparator 126 turns on the secondary side winding switch 122 and the secondary side winding second switch 128, so that the number of turns of the secondary side winding 110 is maximum. This increases the turn ratio and the output voltage 114 reverts to the output preset voltage.

[0032]

When the input voltage 112 is not less than the input preset voltage, the comparator 126 does not turn on the secondary side winding switch 122 and the secondary side winding second switch 128, so that the number of turns of the secondary side winding 110 is reduced. Less than the maximum.

[0033]

The effect of the present invention is to vary the turns ratio to still have the same hold time when using a small storage capacitor, thereby reducing the size of the power supply.

[0034]

However, the above is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the equivalent changes and modifications made by the scope of the present invention should still be covered by the patent of the present invention. The scope of the scope is intended to protect. In summary, it is known that the present invention has industrial applicability, novelty and advancement, and the structure of the present invention has not been seen in similar products and public use, and fully complies with the requirements of the invention patent application, and is filed according to the patent law.

10‧‧‧Power supply unit with extended hold time function

30‧‧‧ Output

102‧‧‧Transformers

104‧‧‧Wind switching unit

106‧‧‧Detection unit

108‧‧‧Primary winding

110‧‧‧Secondary side winding

112‧‧‧Input voltage

114‧‧‧Output voltage

Claims (7)

[Item 1] A power supply device with an extended maintenance time function, comprising:
a transformer
a winding switching unit electrically connected to the transformer; and a detecting unit electrically connected to the winding switching unit
Where the transformer contains:
a primary side winding; and a primary side winding coupled to the primary side winding,
The number of turns of the secondary side winding has a turn ratio of the number of turns of the primary side winding; when the detecting unit detects that an input voltage of the primary side winding is less than an input preset voltage, the winding is switched. The unit increases the turns ratio so that an output voltage of the secondary side winding is returned to an output preset voltage. [Item 2] The power supply device with the extended maintenance time function described in claim 1 further includes a rectifier electrically connected to the transformer; wherein the detecting unit detects an AC power terminal and the rectifier a contact, or a junction between the rectifier and the primary side winding, or an output of the power supply having an extended duration function. [Item 3] The power supply device of the invention of claim 2, wherein the winding switching unit comprises a primary side winding switch electrically connected to the primary side winding and the detecting unit; A center tapped transformer. [Item 4] The power supply device with extended hold time function as described in claim 3, wherein the detecting unit comprises a comparator electrically connected to the winding switching unit. [Item 5] The power supply device with extended hold time function as described in claim 3, wherein the winding switching unit increases the turn ratio when the detecting unit does not receive any signal for more than a predetermined time. [Item 6] A power supply device having an extended duration function as described in claim 1 wherein the secondary side winding comprises:
a first secondary side winding electrically connected to the winding switching unit; and a second secondary side winding electrically connected to the winding switching unit and the first secondary winding
The winding switching unit includes a primary-stage side winding switch electrically connected to the first secondary side winding, the second secondary side winding, and the detecting unit. [Item 7] The power supply device with the extended duration function as described in claim 6 further includes a rectifier electrically connected to the transformer; wherein the detecting unit includes a comparator electrically connected to the winding switching unit .