TWM507617U - Power supply apparatus with active clamping circuit - Google Patents

Description

Power supply device with active clamp circuit 【0001】

The present invention relates to a power supply device, and more particularly to a power supply device having an active clamp circuit.

【0002】

The power supply device is a common electronic device; the power supply device supplies power to the load device to drive the load device; therefore, the power supply device is very important.

[0003]

When the power supply device is in operation, voltage spikes are easily generated. A disadvantage of the conventional power supply device is that the diode of the secondary side rectifying unit of the power supply device is easily damaged by voltage spikes, and the energy of the voltage spike is not reused.

[0004]

In order to improve the above disadvantages of the prior art, the purpose of the present invention is to provide a power supply device having a low loss active clamp circuit.

[0005]

In order to achieve the above object of the present invention, the power supply device having the active clamp circuit of the present invention comprises: a power supply circuit; and an active clamp circuit electrically connected to the power supply circuit. The power supply circuit includes: a primary-stage rectifying unit electrically connected to the active clamping circuit; and a voltage output terminal electrically connected to the active clamping circuit and the Secondary side rectification unit. The active clamping circuit includes: a clamp energy storage unit electrically connected to the secondary side rectifying unit; a feedback control unit, the feedback control unit is electrically connected to the clamp An energy storage unit; and a synchronous buck converter electrically connected to the clamp energy storage unit, the feedback control unit, and the voltage output terminal. The clamp energy storage unit clamps and stores a voltage spike to obtain a storage voltage; the feedback control unit detects the storage voltage and notifies the synchronous buck converter of the storage voltage; when the storage voltage is When the voltage is greater than a predetermined voltage, the synchronous buck converter receives the storage voltage and adjusts the storage voltage to obtain an adjustment voltage; the synchronous buck converter transmits the adjustment voltage to the voltage output terminal.

[0006]

The effect of this creation is to protect the diode of the secondary side rectifying unit of the power supply device from voltage spikes, and use the active clamping circuit to convert the energy of the voltage spike into the voltage energy of the reusable output.

[0026]

10‧‧‧Power supply unit with active clamp circuit

[0027]

20‧‧‧Power supply circuit

[0028]

30‧‧‧Active Clamp Circuit

[0029]

202‧‧‧Secondary side rectification unit

[0030]

204‧‧‧voltage output

[0031]

206‧‧‧Output capacitor

[0032]

208‧‧‧Output inductance

[0033]

210‧‧‧Transformer

[0034]

212‧‧‧Primary side voltage processing circuit

[0035]

302‧‧‧Clamp energy storage unit

[0036]

304‧‧‧Feedback Control Unit

[0037]

306‧‧‧Synchronous Buck Converter

[0038]

20202‧‧‧First Diode

[0039]

20204‧‧‧Secondary diode

[0040]

20206‧‧‧First Synchronous Rectifier Switch

[0041]

20208‧‧‧Second synchronous rectification switch

[0042]

30202‧‧‧ Third Dipole

[0043]

30204‧‧‧Fourth dipole

[0044]

30206‧‧‧ storage capacitor

[0045]

30402‧‧‧First resistance

[0046]

30404‧‧‧second resistance

[0047]

30406‧‧‧Three-terminal adjustable regulator

[0048]

30408‧‧‧ Third resistor

[0049]

30410‧‧‧DC voltage source

[0050]

30412‧‧‧fourth resistor

[0051]

30414‧‧‧ fifth resistor

[0052]

30416‧‧‧6th resistor

[0053]

30418‧‧‧ seventh resistor

[0054]

30602‧‧‧Control unit

[0055]

30604‧‧‧First switch unit

[0056]

30606‧‧‧Second switch unit

[0057]

30608‧‧‧Inductance

[0058]

30610‧‧‧ Capacitance

[0059]

30612‧‧‧ diode

【0007】

FIG. 1 is a block diagram of a power supply device with an active clamp circuit according to the present invention.

[0008]

Figure 2 is a block diagram of the feedback control unit of the present invention.

【0009】

Figure 3 is a block diagram of the synchronous buck converter of the present invention.

[0010]

4 is another embodiment of a block diagram of a power supply device having an active clamp circuit.

[0011]

The detailed description and technical contents of the present invention are described in the following detailed description and the accompanying drawings.

[0012]

Please refer to FIG. 1 , which is a block diagram of a power supply device with an active clamp circuit. A power supply device 10 having an active clamping circuit includes a power supply circuit 20 and an active clamping circuit 30. The power supply circuit 20 includes a primary-stage rectifying unit 202, a voltage output terminal 204, and an output capacitor 206. An output inductor 208, a transformer 210 and a primary side voltage processing circuit 212; the active clamp circuit 30 includes a clamped energy storage unit 302, a feedback control unit 304 and a synchronous buck converter 306; The stage side rectifying unit 202 includes a first diode 20202 and a second diode 20204. The clamping energy storage unit 302 includes a third diode 30202, a fourth diode 30204, and a storage capacitor. 30206.

[0013]

The active clamping circuit 30 is electrically connected to the power supply circuit 20; the secondary side rectifying unit 202 is electrically connected to the active clamping circuit 30; the voltage output terminal 204 is electrically connected to the active clamping circuit 30 and The output side capacitor 206 is electrically connected to the voltage output terminal 204; the output terminal inductor 208 is electrically connected to the voltage output terminal 204; the transformer 210 is electrically connected to the first diode The body 2012, the second diode 20204, the third diode 30202, the fourth diode 30204, and the output inductor 208; the primary voltage processing circuit 212 is electrically connected to the transformer 210; A diode 20202 is electrically connected to the clamp energy storage unit 302; the second diode 20204 is electrically connected to the clamp energy storage unit 302.

[0014]

The clamp energy storage unit 302 is electrically connected to the secondary side rectification unit 202; the feedback control unit 304 is electrically connected to the clamp energy storage unit 302; the synchronous buck converter 306 is electrically connected to the clamp The bit energy storage unit 302, the feedback control unit 304 and the voltage output terminal 204; the third diode 30202 is electrically connected to the first diode 2022, the feedback control unit 304, and the synchronous buck conversion The second diode 30204 is electrically connected to the second diode 20204, the third diode 30202, the feedback control unit 304 and the synchronous buck converter 306; the storage capacitor 30206 The third diode 30202, the fourth diode 30204, the feedback control unit 304, and the synchronous buck converter 306 are electrically connected.

[0015]

The clamp energy storage unit 302 clamps and stores a voltage spike to obtain a storage voltage; the feedback control unit 304 detects the storage voltage and notifies the synchronous buck converter 306 of the storage voltage. When the stored voltage is greater than a predetermined voltage, the synchronous buck converter 306 receives the stored voltage and adjusts the stored voltage to obtain an adjusted voltage; the synchronous buck converter 306 transmits the adjusted voltage to the Voltage output 204.

[0016]

Please refer to FIG. 2, which is a block diagram of the feedback control unit of the present invention. The feedback control unit 304 includes a first resistor 30402, a second resistor 30404, a three-terminal adjustable regulator 30406, a third resistor 30408, a DC voltage source 30410, a fourth resistor 30412, and a fifth The resistor 30414, a sixth resistor 30416 and a seventh resistor 30418.

[0017]

The first resistor 30402 is electrically connected to the clamp energy storage unit 302 and the synchronous buck converter 306; the second resistor 30404 is electrically connected to the first resistor 30402; the three-terminal adjustable voltage regulator 30406 is electrically The third resistor 30408 is electrically connected to the three-terminal adjustable voltage regulator 30406; the DC voltage source 30410 is electrically connected to the third resistor 30408; The fourth resistor 30412 is electrically connected to the three-terminal adjustable voltage regulator 30406 and the third resistor 30408; the fifth resistor 30414 is electrically connected to the DC voltage source 30410 and the fourth resistor 30412; the sixth resistor 30416 The seventh resistor 30412 is electrically connected to the sixth resistor 30414 and the synchronous buck converter 306. The seventh resistor 30418 is electrically connected to the sixth resistor 30416 and the synchronous buck converter 306.

[0018]

Please refer to FIG. 3, which is a block diagram of the synchronous buck converter of the present invention. The synchronous buck converter 306 includes a control unit 30602, a first switch unit 30604, a second switch unit 30606, an inductor 30608, a capacitor 30610, and a diode 30612.

[0019]

The control unit 30602 is electrically connected to the feedback control unit 304; the first switch unit 30604 is electrically connected to the control unit 30602, the clamp energy storage unit 302 and the feedback control unit 304; the second switch unit 30606 is electrically connected to the control unit 30602 and the first switch unit 30604; the inductor 30608 is electrically connected to the first switch unit 30604 and the second switch unit 30606; the capacitor 30610 is electrically connected to the inductor 30608; The diode 30612 is electrically connected to the inductor 30608, the capacitor 30610 and the voltage output terminal 204.

[0020]

Please refer to Figure 1, Figure 2 and Figure 3 at the same time. When the voltage spike is generated, the first diode 20202 and the second diode 20204 are easily damaged. The clamp energy storage unit 302 clamps and stores the voltage spike at the storage capacitor 30206 to obtain the storage voltage; the feedback control unit 304 detects the storage voltage and notifies the synchronous buck converter 306 of the storage. The voltage can be applied; when the stored voltage is greater than the predetermined voltage (eg, 43 volts), the feedback control unit 304 transmits a first feedback signal (eg, 0.68 volts) to the control unit 30602, such that the synchronous buck conversion The 306 receives the storage voltage and adjusts the storage voltage by the first switching unit 30604, the second switching unit 30606, the inductor 30608 and the capacitor 30610 to obtain the adjustment voltage; the synchronous buck converter 306 passes The diode 30612 transmits the adjustment voltage to the voltage output terminal 204.

[0021]

When the stored voltage is not greater than the preset voltage, the feedback control unit 304 transmits a second feedback signal (eg, 1.1 volts) to the control unit 30602, such that the control unit 30602 stops manipulating the first switch unit 30604. And the second switching unit 30606.

[0022]

In one embodiment, the control unit 30602 has a threshold voltage (e.g., 0.8 volts). When the feedback control unit 304 transmits the first feedback signal (for example, 0.68 volts) to the control unit 30602, the control unit 30602 determines that the first feedback signal is less than the threshold voltage, so that the control unit 30602 controls the first A switching unit 30604 and the second switching unit 30606 perform a switching operation; when the feedback control unit 304 transmits the second feedback signal (eg, 1.1 volts) to the control unit 30602, the control unit 30602 determines the second The feedback signal is not less than the threshold voltage, so that the control unit 30602 stops manipulating the first switching unit 30604 and the second switching unit 30606 to perform a switching operation.

[0023]

Please refer to FIG. 4 , which is another block diagram of a power supply device with an active clamp circuit according to the present invention; FIG. 4 is mostly consistent with FIG. 1 , and the same portions are not described again. FIG. 4 and FIG. 1 are different. The second diode 20202 and the second diode 20204 are replaced by a first synchronous rectification switch 20206 and a second synchronous rectification switch 20208. The first synchronous rectification switch 20206 is electrically connected to the clamp storage. The energy unit 302 is electrically connected to the clamp energy storage unit 302. The first synchronous rectification switch 20206 and the second synchronous rectification switch 20208 may be metal oxide half field effect transistors (MOSFETs).

[0024]

The effect of this creation is to protect the diode of the secondary side rectifying unit of the power supply device from voltage spikes, and use the active clamping circuit to convert the energy of the voltage spike into the voltage energy of the reusable output.

[0025]

However, the above is only a preferred embodiment of the present invention, and the scope of the present invention cannot be limited, that is, the equal changes and modifications made by the scope of the patent application of the present invention should still be covered by the patent of the present invention. The scope of the scope is intended to protect. There may be other various embodiments of the present invention, and those skilled in the art can make various corresponding changes and modifications according to the present invention without departing from the spirit of the present invention, but the corresponding changes and modifications are It is intended to fall within the scope of the appended claims. In summary, when Zhiben's creation has industrial applicability, novelty and progressiveness, and the structure of this creation has not been seen in similar products and public use, it fully complies with the requirements of new patent applications and applies for patent law.

10‧‧‧Power supply unit with active clamp circuit

20‧‧‧Power supply circuit

30‧‧‧Active Clamp Circuit

202‧‧‧Secondary side rectification unit

204‧‧‧voltage output

206‧‧‧Output capacitor

208‧‧‧Output inductance

210‧‧‧Transformer

212‧‧‧Primary side voltage processing circuit

302‧‧‧Clamp energy storage unit

304‧‧‧Feedback Control Unit

306‧‧‧Synchronous Buck Converter

20202‧‧‧First Diode

20204‧‧‧Secondary diode

30202‧‧‧ Third Dipole

30204‧‧‧Fourth dipole

30206‧‧‧ storage capacitor

Claims (10)

[Item 1] A power supply device with an active clamping circuit, comprising:
a power supply circuit; and an active clamping circuit, the active clamping circuit is electrically connected to the power supply circuit,
Wherein the power supply circuit comprises:
a secondary side rectifying unit electrically connected to the active clamping circuit; and a voltage output end electrically connected to the active clamping circuit and the secondary side rectifying unit
Wherein the active clamp circuit comprises:
a clamped energy storage unit electrically connected to the secondary side rectifying unit;
a feedback control unit, the feedback control unit is electrically connected to the clamp energy storage unit; and a synchronous buck converter electrically connected to the clamp energy storage unit, the feedback Control unit and the voltage output terminal,
The clamp energy storage unit clamps and stores a voltage spike to obtain a storage voltage; the feedback control unit detects the storage voltage and notifies the synchronous buck converter of the storage voltage; when the storage voltage is When the voltage is greater than a predetermined voltage, the synchronous buck converter receives the storage voltage and adjusts the storage voltage to obtain an adjustment voltage; the synchronous buck converter transmits the adjustment voltage to the voltage output terminal. [Item 2] The power supply device with an active clamp circuit according to claim 1, wherein the secondary side rectifying unit comprises:
a first diode, the first diode is electrically connected to the clamp energy storage unit; and a second diode electrically connected to the clamp energy storage unit. [Item 3] The power supply device with an active clamp circuit according to claim 2, wherein the clamp energy storage unit comprises:
a third diode, the third diode is electrically connected to the first diode, the feedback control unit, and the synchronous buck converter;
a fourth diode, the fourth diode is electrically connected to the second diode, the third diode, the feedback control unit and the synchronous buck converter; and a storage capacitor, The storage capacitor is electrically connected to the third diode, the fourth diode, the feedback control unit, and the synchronous buck converter. [Item 4] The power supply device with an active clamp circuit according to claim 3, wherein the feedback control unit comprises:
a first resistor, the first resistor is electrically connected to the clamp energy storage unit and the synchronous buck converter;
a second resistor electrically connected to the first resistor; and a three-terminal adjustable regulator, the three-terminal adjustable regulator electrically connected to the first resistor and the second resistor. [Item 5] The power supply device with an active clamp circuit according to claim 4, wherein the feedback control unit further comprises:
a third resistor electrically connected to the three-terminal adjustable regulator;
a DC voltage source electrically connected to the third resistor; and a fourth resistor electrically coupled to the three-terminal adjustable regulator and the third resistor. [Item 6] The power supply device with an active clamp circuit according to claim 5, wherein the feedback control unit further comprises:
a fifth resistor electrically connected to the DC voltage source and the fourth resistor;
a sixth resistor electrically connected to the fourth resistor, the fifth resistor and the synchronous buck converter; and a seventh resistor electrically connected to the sixth resistor and the Synchronous buck converter. [Item 7] The power supply device with an active clamp circuit according to claim 6, wherein the synchronous buck converter comprises:
a control unit electrically connected to the feedback control unit;
a first switching unit electrically connected to the control unit, the clamp energy storage unit and the feedback control unit;
a second switching unit electrically connected to the control unit and the first switching unit;
An inductor electrically connected to the first switching unit and the second switching unit;
a capacitor electrically connected to the inductor; and a diode electrically connected to the inductor, the capacitor, and the voltage output terminal. [Item 8] The power supply device with an active clamp circuit according to claim 7, wherein the power supply circuit further comprises:
An output capacitor, the output capacitor is electrically connected to the voltage output terminal;
An output inductor, the output inductor is electrically connected to the voltage output terminal;
a transformer electrically connected to the first diode, the second diode, the third diode, the fourth diode, and the output inductor; and a primary side voltage processing circuit, The primary side voltage processing circuit is electrically connected to the transformer. [Item 9] The power supply device with an active clamp circuit according to claim 1, wherein the secondary side rectifying unit comprises:
a first synchronous rectification switch, the first synchronous rectification switch is electrically connected to the clamp energy storage unit; and a second synchronous rectification switch electrically connected to the clamp energy storage unit. [Item 10] The power supply device with an active clamp circuit according to claim 9, wherein the first synchronous rectification relationship is a MOS field effect transistor; the second synchronous rectification relationship is a MOSFET. Transistor.