TWI501521B - Power supply apparatus with second boost circuit - Google Patents

Description

Power supply device with secondary boost circuit 【0001】

The present invention relates to a power supply device, and more particularly to a power supply device having a secondary boost circuit.

【0002】

Please refer to FIG. 1, which is a block diagram of a related art power supply device. A related art power supply device 40 is applied to an AC power supply device 20 and a load device 30. The power supply device 40 of the related art includes a rectifier circuit 102, a power factor correction circuit 104, and a DC to DC conversion circuit 108.

[0003]

The rectifier circuit 102 is electrically connected to the AC power supply device 20; the power factor correction circuit 104 is electrically connected to the rectifier circuit 102; the DC to DC conversion circuit 108 is electrically connected to the power factor correction circuit 104 and the load Device 30.

[0004]

The AC power supply device 20 transmits an AC power source 22 to the rectifier circuit 102. The rectifier circuit 102 rectifies the AC power source 22 to obtain a DC power source 24, and the rectifier circuit 102 transmits the DC power source 24 to the power factor correction circuit 104. The power factor correction circuit 104 processes the DC power source 24 to obtain a power factor correction power source 26.

[0005]

The power factor correction circuit 104 transmits the power factor correction power supply 26 to the DC to DC conversion circuit 108, and the DC to DC conversion circuit 108 converts the power factor correction power supply 26 into a driving power source 29, and the DC to DC conversion circuit 108 transmits The drive power source 29 is to the load device 30.

[0006]

Please refer to FIG. 2 , which is a voltage waveform diagram of one embodiment of the power factor correction power supply of the related art power supply device; and please refer to FIG. 1 at the same time. When the AC power supply device 20 normally supplies the AC power source 22, the power factor correction power source 26 is a 400 volt DC power source.

【0007】

When the AC power supply device 20 stops providing the AC power source 22 (at the dotted line), the power factor correction power source 26 does not immediately drop to zero volts; the power factor correction power source 26 gradually drops to zero volts, thereby enabling The DC-to-DC conversion circuit 108 and the load device 30 are protected; the interval from the AC power supply device 20 stopping the supply of the AC power source 22 to the power factor correction power source 26 becoming zero volts is defined as a maintenance time (for example, 10 milliseconds) ).

[0008]

Although the power factor correction power supply 26 is gradually reduced to zero volts when the AC power supply device 20 stops supplying the AC power source 22, the DC to DC conversion circuit 108 may still be changed by the power factor correction power source 26. Damaged; therefore, the components used in the DC-to-DC converter circuit 108 must have a high specification (e.g., withstand voltage), increasing the cost of the DC-to-DC converter circuit 108.

【0009】

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 a secondary boosting circuit.

[0010]

In order to achieve the above object of the present invention, a power supply device having a secondary boosting circuit of the present invention is applied to an AC power supply device and a load device, and the power supply device having the secondary boost circuit includes: a rectifier circuit The rectifier circuit is electrically connected to the AC power supply device; a power factor correction circuit is electrically connected to the rectifier circuit; and a secondary boost circuit is electrically connected to the The power factor correction circuit and the DC-DC conversion circuit are electrically connected to the secondary boost circuit and the load device. The secondary boosting circuit includes: an input contact electrically connected to the power factor correction circuit; an output contact, the output contact is electrically connected to the DC to DC conversion circuit; a detecting unit, the voltage detecting unit is electrically connected to the input contact; a control unit electrically connected to the voltage detecting unit and the power factor correcting circuit; a boosting unit, the boosting unit Electrically connected to the input contact, the output contact and the control unit; and a boost bypass unit electrically connected to the input contact, the output contact, the control unit and The DC to DC conversion circuit. The AC power supply device transmits an AC power source to the rectifier circuit, the rectifier circuit rectifies the AC power source to obtain a DC power source, and the rectifier circuit transmits the DC power source to the power factor correction circuit, and the power factor correction circuit processes the The DC power source obtains a power factor correction power supply, and the power factor correction circuit transmits the power factor correction power supply to the input contact. The voltage detecting unit detects the power factor correction power supply and then notifies the control unit. When the voltage value of one of the power factor correction power supplies is greater than a predetermined voltage value, the control unit turns on the boost bypass unit and does not turn on the boosting unit, so that the power factor correction power supply is via the boost bypass unit. And the output contact is transmitted to the DC to DC conversion circuit. When the voltage value of the power factor correction power supply is not greater than the preset voltage value, the control unit does not turn on the boost bypass unit and turns on the boosting unit, so that the boosting unit corrects the power factor for the power factor. And then the power factor correction power supply is transmitted to the DC to DC conversion circuit via the boosting unit and the output contact.

[0011]

The effect of the invention is to reduce the variation of the input voltage of the DC-to-DC conversion circuit when the AC power supply device stops providing the AC power supply, to optimize the design of the DC-DC conversion circuit and reduce the DC-to-DC conversion The cost of the circuit.

[0046]

10‧‧‧Power supply unit with secondary boost circuit

[0047]

20‧‧‧AC power supply unit

[0048]

22‧‧‧AC power supply

[0049]

24‧‧‧DC power supply

[0050]

26‧‧‧Power Factor Correction Power Supply

[0051]

28‧‧‧Boost power supply

[0052]

29‧‧‧Drive power supply

[0053]

30‧‧‧Loading device

[0054]

40‧‧‧ Related technology power supply unit

[0055]

102‧‧‧Rectifier circuit

[0056]

104‧‧‧Power factor correction circuit

[0057]

106‧‧‧Secondary booster circuit

[0058]

108‧‧‧DC to DC conversion circuit

[0059]

10602‧‧‧Input contacts

[0060]

10604‧‧‧Output contacts

[0061]

10606‧‧‧Voltage detection unit

[0062]

10608‧‧‧Control unit

[0063]

10610‧‧‧Boost unit

[0064]

10612‧‧‧Boost bypass unit

[0065]

10614‧‧‧Responsible unit

[0066]

R1‧‧‧first resistance

[0067]

T1‧‧‧first transistor

[0068]

OC1‧‧‧Optocoupler

[0069]

R2‧‧‧second resistance

[0070]

ZD1‧‧‧Zina diode

[0071]

R3‧‧‧ third resistor

[0072]

T2‧‧‧second transistor

[0073]

T3‧‧‧ third transistor

[0074]

C1‧‧‧first capacitor

[0075]

T4‧‧‧ fourth transistor

[0076]

L1‧‧‧first inductance

[0077]

D1‧‧‧First Diode

[0078]

R4‧‧‧fourth resistor

[0079]

R5‧‧‧ fifth resistor

[0080]

R6‧‧‧ sixth resistor

[0081]

R7‧‧‧ seventh resistor

[0082]

R8‧‧‧ eighth resistor

[0083]

R9‧‧‧ ninth resistor

[0084]

R10‧‧‧10th resistor

[0085]

R11‧‧‧ eleventh resistor

[0012]

1 is a block diagram of a power supply device of the related art.

[0013]

2 is a voltage waveform diagram of an embodiment of the power factor correction power supply of the power supply device of the related art.

[0014]

3 is a block diagram of a power supply device having a secondary boosting circuit of the present invention.

[0015]

4 is a voltage waveform diagram of an embodiment of the power factor correction power supply and the boost power supply of the power supply device having the secondary boost circuit of the present invention.

[0016]

Figure 5 is a circuit diagram of the boost bypass unit of the present invention.

[0017]

Fig. 6 is a circuit diagram of a boosting unit of the present invention.

[0018]

Figure 7 is a circuit diagram of a feedback unit of the present invention.

[0019]

FIG. 8 is a circuit diagram of a voltage detecting unit of the present invention.

[0020]

Please refer to FIG. 3 , which is a block diagram of a power supply device with a secondary boost circuit according to the present invention; a power supply device 10 having a secondary boost circuit is applied to an AC power supply device 20 and a load device 30 . .

[0021]

The power supply device 10 having a secondary boost circuit includes a rectifier circuit 102, a power factor correction circuit 104, a secondary boost circuit 106, and a DC-DC converter circuit 108.

[0022]

The secondary boosting circuit 106 includes an input contact 10602, an output contact 10604, a voltage detecting unit 10606, a control unit 10608, a boosting unit 10610, a boost bypass unit 10612, and a feedback unit. 10614.

[0023]

The rectifier circuit 102 is electrically connected to the AC power supply device 20; the power factor correction circuit 104 is electrically connected to the rectifier circuit 102; the secondary boost circuit 106 is electrically connected to the power factor correction circuit 104; The DC-DC conversion circuit 108 is electrically connected to the secondary boost circuit 106 and the load device 30.

[0024]

The input contact 10602 is electrically connected to the power factor correction circuit 104; the output contact 10604 is electrically connected to the DC to DC conversion circuit 108; the voltage detection unit 10606 is electrically connected to the input contact 10602; The control unit 10608 is electrically connected to the voltage detecting unit 10606 and the power factor correction circuit 104; the boosting unit 10610 is electrically connected to the input contact 10602, the output contact 10604, and the control unit 10608; The bypass unit 10612 is electrically connected to the input contact 10602, the output contact 10604, the control unit 10608, and the DC-to-DC conversion circuit 108. The feedback unit 10614 is electrically connected to the control unit 10608 and the output connection Point 10604.

[0025]

The AC power supply device 20 transmits an AC power source 22 to the rectifier circuit 102. The rectifier circuit 102 rectifies the AC power source 22 to obtain a DC power source 24, and the rectifier circuit 102 transmits the DC power source 24 to the power factor correction circuit 104. The power factor correction circuit 104 processes the DC power source 24 to obtain a power factor correction power supply 26 that transmits the power factor correction power supply 26 to the input contact 10602.

[0026]

The voltage detecting unit 10606 detects the power factor correction power source 26 and then notifies the control unit 10608.

[0027]

Please refer to FIG. 4 , which is a voltage waveform diagram of an embodiment of the power factor correction power supply and the boost power supply of the power supply device with a secondary boost circuit of the present invention; and FIG. 3 . When the AC power supply device 20 normally supplies the AC power source 22, the power factor correction power source 26 is a 400 volt DC power source.

[0028]

When one of the power factor correction power sources 26 has a voltage value greater than a predetermined voltage value (eg, 370 volts), the control unit 10608 turns on the boost bypass unit 10612 and does not turn on the boost unit 10610, such that the power factor correction The power supply 26 is transmitted to the DC-to-DC conversion circuit 108 via the boost bypass unit 10612 and the output contact 10604.

[0029]

When the voltage value of the power factor correction power supply 26 is not greater than the preset voltage value, the control unit 10608 does not turn on the boost bypass unit 10612 and turns on the boosting unit 10610, so that the boosting unit 10610 is powered. The factor correction power supply 26 is boosted and then the power factor correction power supply 26 is transmitted to the DC to DC conversion circuit 108 via the boosting unit 10610 and the output contact 10604.

[0030]

In a specific embodiment, first, the control unit 10608 does not turn on the boost bypass unit 10612, and then the control unit 10608 turns on the boost unit 10610, thereby the power supply device with the secondary boost circuit. 10 can be protected more effectively.

[0031]

In other words, after the boosting unit 10610 boosts the power factor correction power supply 26, the boosting unit 10610 boosts the power factor correction power supply 26 to obtain a boost power supply 28 (e.g., 380 volts) and maintains The boosting power supply 28 is until the power factor correction power supply 26 is zero; after the power factor correction power supply 26 is zero, the boosting power supply 28 is decremented to zero with a slope; the boosting unit 10610 transmits the boosting power supply 28 to The DC to DC conversion circuit 108.

[0032]

The DC-to-DC conversion circuit 108 converts the power factor correction power supply 26 (the boost power supply 28) into a drive power source 29 that transmits the drive power source 29 to the load device 30.

[0033]

Please refer to FIG. 5 , which is a circuit diagram of the boost bypass unit of the present invention. The boost bypass unit 10612 includes a first resistor R1, a first transistor T1, an optocoupler OC1, a second resistor R2, a Zener diode ZD1, a third resistor R3, and a second resistor. The crystal T2, a third transistor T3 and a first capacitor C1.

[0034]

The first resistor R1 is electrically connected to the control unit 10608; the first transistor T1 is electrically connected to the first resistor R1; the optical coupler OC1 is electrically connected to the first transistor T1, the DC to DC The conversion circuit 108 and the input contact 10602; the second resistor R2 is electrically connected to the optical coupler OC1 and the DC to DC conversion circuit 108; the Zener diode ZD1 is electrically connected to the DC to DC conversion circuit 108 and the input contact 10602.

[0035]

The second resistor R3 is electrically connected to the DC-to-DC conversion circuit 108 and the input contact 10602; the first transistor T2 is electrically connected to the DC-to-DC conversion circuit 108, the input contact 10602, and the output connection Point 10604; the third transistor T3 is electrically connected to the DC-to-DC conversion circuit 108, the input contact 10602, and the output contact 10604; the first capacitor C1 is electrically connected to the output contact 10604.

[0036]

The DC to DC conversion circuit 108 provides a driving voltage to the boost bypass unit 10612.

[0037]

Please refer to FIG. 6, which is a circuit diagram of the boosting unit of the present invention. The boosting unit 10610 includes a fourth transistor T4, a first inductor L1, a first diode D1, a fourth resistor R4, and a fifth resistor R5.

[0038]

The fourth transistor T4 is electrically connected to the control unit 10608; the first inductor L1 is electrically connected to the fourth transistor T4 and the input contact 10602; the first diode D1 is electrically connected to the first a fourth transistor R4, the first inductor L1 and the output contact 10604; the fourth resistor R4 is electrically connected to the fourth transistor T4 and the control unit 10608; the fifth resistor R5 is electrically connected to the fourth The transistor T4 and the fourth resistor R4.

[0039]

Please refer to FIG. 7, which is a circuit diagram of the feedback unit of the present invention. The feedback unit 10614 includes a sixth resistor R6, a seventh resistor R7 and an eighth resistor R8.

[0040]

The sixth resistor R6 is electrically connected to the output contact 10604; the seventh resistor R7 is electrically connected to the sixth resistor R6; the eighth resistor R8 is electrically connected to the seventh resistor R7 and the control unit 10608.

[0041]

Please refer to FIG. 8 , which is a circuit diagram of the voltage detecting unit of the present invention. The voltage detecting unit 10606 includes a ninth resistor R9, a tenth resistor R10 and an eleventh resistor R11.

[0042]

The ninth resistor R9 is electrically connected to the input contact 10602; the tenth resistor R10 is electrically connected to the ninth resistor R9; the eleventh resistor R11 is electrically connected to the tenth resistor R10 and the control unit 10608 .

[0043]

An advantage of the present invention is that when the AC power supply device 20 stops supplying the AC power source 22, the variation of the input voltage of the DC-to-DC converter circuit 108 is reduced (that is, the input voltage of the DC-DC converter circuit 108 is extended to zero. Time) to optimize the design of the DC to DC conversion circuit 108 (eg, X'mer, SR_MosFet, etc.) and to reduce the cost of the DC to DC conversion circuit 108 (ie, used in the DC to DC conversion circuit) Parts of 108 do not have to have high specifications).

[0044]

Furthermore, the optocoupler OC1 can be used to increase the electrical barrier effect to protect the second transistor T2 and the third transistor T3. The present invention can extend the maintenance time because there is no duty limited problem. The PWM period of the DC to DC conversion circuit 108 is designed to be 370 to 400 volts; this is an optimized design in the X'mer.

[0045]

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 secondary boost circuit

20‧‧‧AC power supply unit

22‧‧‧AC power supply

24‧‧‧DC power supply

26‧‧‧Power Factor Correction Power Supply

28‧‧‧Boost power supply

29‧‧‧Drive power supply

30‧‧‧Loading device

102‧‧‧Rectifier circuit

104‧‧‧Power factor correction circuit

106‧‧‧Secondary booster circuit

108‧‧‧DC to DC conversion circuit

10602‧‧‧Input contacts

10604‧‧‧Output contacts

10606‧‧‧Voltage detection unit

10608‧‧‧Control unit

10610‧‧‧Boost unit

10612‧‧‧Boost bypass unit

10614‧‧‧Responsible unit

Claims (10)

[Item 1] A power supply device with a secondary boost circuit is applied to an AC power supply device and a load device, and the power supply device with a secondary boost circuit includes:
a rectifier circuit electrically connected to the AC power supply device;
a power factor correction circuit electrically connected to the rectifier circuit;
a secondary boosting circuit electrically connected to the power factor correction circuit; and a DC-DC conversion circuit electrically connected to the secondary boosting circuit and the load device ,
Wherein the secondary boost circuit comprises:
An input contact electrically connected to the power factor correction circuit;
An output contact, the output contact is electrically connected to the DC to DC conversion circuit;
a voltage detecting unit, the voltage detecting unit is electrically connected to the input contact;
a control unit electrically connected to the voltage detecting unit and the power factor correction circuit;
a boosting unit electrically connected to the input contact, the output contact and the control unit; and a boost bypass unit electrically connected to the input contact, The output contact, the control unit, and the DC-to-DC conversion circuit, wherein the AC power supply device transmits an AC power source to the rectifier circuit, the rectifier circuit rectifies the AC power source to obtain a DC power source, and the rectifier circuit transmits the Directing a DC power supply to the power factor correction circuit, the power factor correction circuit processing the DC power supply to obtain a power factor correction power supply, the power factor correction circuit transmitting the power factor correction power supply to the input contact;
The voltage detecting unit detects the power factor correction power supply and then notifies the control unit;
When the voltage value of one of the power factor correction power supplies is greater than a predetermined voltage value, the control unit turns on the boost bypass unit and does not turn on the boosting unit, so that the power factor correction power supply is via the boost bypass unit. And the output contact is transmitted to the DC to DC conversion circuit;
When the voltage value of the power factor correction power supply is not greater than the preset voltage value, the control unit does not turn on the boost bypass unit and turns on the boosting unit, so that the boosting unit corrects the power factor for the power factor. And then the power factor correction power supply is transmitted to the DC to DC conversion circuit via the boosting unit and the output contact. [Item 2] The power supply device with a secondary boost circuit as described in claim 1 further includes:
a feedback unit electrically connected to the control unit and the output contact. [Item 3] The power supply device with a secondary boost circuit as described in claim 2, wherein the boost bypass unit comprises:
a first resistor, the first resistor is electrically connected to the control unit;
a first transistor, the first transistor is electrically connected to the first resistor;
An optocoupler, the optocoupler OC1 is electrically connected to the first transistor, the DC to DC conversion circuit and the input contact; and a second resistor electrically connected to the optocoupler And the DC to DC conversion circuit. [Item 4] The power supply device with a secondary boost circuit as described in claim 3, wherein the boost bypass unit further comprises:
a Zener diode electrically connected to the DC-to-DC conversion circuit and the input contact; and a third resistor electrically connected to the DC-to-DC conversion circuit and the Enter the contact. [Item 5] The power supply device with a secondary boost circuit as described in claim 4, wherein the boost bypass unit further comprises:
a second transistor, the first transistor is electrically connected to the DC to DC conversion circuit, the input contact and the output contact;
a third transistor electrically connected to the DC-to-DC conversion circuit, the input contact and the output contact; and a first capacitor electrically connected to the output contact . [Item 6] The power supply device with a secondary boost circuit as described in claim 5, wherein the boosting unit comprises:
a fourth transistor, the fourth transistor is electrically connected to the control unit;
a first inductor electrically connected to the fourth transistor and the input contact; and a first diode electrically connected to the fourth transistor, the first An inductor and the output contact. [Item 7] The power supply device with a secondary boost circuit as described in claim 6, wherein the boosting unit further comprises:
a fourth resistor electrically connected to the fourth transistor and the control unit; and a fifth resistor electrically connected to the fourth transistor and the fourth resistor. [Item 8] The power supply device with a secondary boost circuit as described in claim 7, wherein the feedback unit comprises:
a sixth resistor electrically connected to the output contact. [Item 9] The power supply device with a secondary boost circuit as described in claim 8 , wherein the feedback unit further comprises:
a seventh resistor electrically connected to the sixth resistor; and an eighth resistor electrically connected to the seventh resistor and the control unit. [Item 10] The power supply device with a secondary boost circuit as described in claim 9, wherein the voltage detecting unit 10606 includes:
a ninth resistor electrically connected to the input contact;
a tenth resistor electrically connected to the ninth resistor; and an eleventh resistor electrically connected to the tenth resistor and the control unit.