CN209896937U - Auxiliary power supply - Google Patents

Abstract

The utility model relates to an auxiliary power supply, include: the rectification module is used for rectifying the alternating current power supply into a direct current power supply; the LC oscillation module is connected with the direct current output end and used for generating resonance; the switch module is connected with the LC oscillation module and is used for being repeatedly switched on and off under the action of the LC oscillation module; the voltage transformation module comprises a primary coil and a secondary coil, the primary coil comprises a first primary coil, and the first end of the first primary coil is connected with the second end of the current output end and is grounded through the module; the secondary coil comprises a first secondary coil and a second secondary coil, and the first secondary coil and the second secondary coil are used for generating current according to the coupling of the primary coil and charging the charging module; when the LC oscillation module controls the switch module to be switched on, the second secondary coil charges the charging module, and when the LC oscillation module controls the switch module to be switched off, the first secondary coil charges the charging module. The LC oscillation module in the application is low in cost, convenient to control and simple in circuit structure.

Description

Auxiliary power supply

Technical Field

The utility model relates to a switching power supply field especially relates to auxiliary power supply.

Background

Auxiliary power supplies are widely used in switching power supplies for supplying power to chips and the like in circuits. Generally, the auxiliary power supply adopts an integrated chip and a transistor, and the transistor is controlled to be repeatedly turned on through the integrated chip, so that the output of the auxiliary power supply is controlled. The inventor finds that the adoption of the integrated chip can cause the increase of the circuit cost in the process of realizing the traditional technology, and is not beneficial to batch production.

SUMMERY OF THE UTILITY MODEL

In view of this, it is necessary to provide an auxiliary power supply in order to solve the problem of high circuit cost.

An auxiliary power supply comprising: rectifier module, LC oscillation module, switch module, vary voltage module, the module of charging, wherein:

the rectification module comprises an alternating current input end and a direct current output end and is used for rectifying an alternating current power supply into a direct current power supply;

the LC oscillating module is connected with the direct current output end and used for generating resonance;

the switch module is connected with the LC oscillation module and is used for being repeatedly switched on and off under the action of the LC oscillation module;

the voltage transformation module comprises a primary coil and a secondary coil, wherein the primary coil comprises a first primary coil, the first end of the first primary coil is connected with the direct current output end, and the second end of the first primary coil is grounded through the switch module; the secondary coil comprises a first secondary coil and a second secondary coil, the first secondary coil and the second secondary coil are connected with the charging module and used for generating current according to the coupling of the primary coil and charging the charging module, and the charging module is connected with a load and used for supplying power to the load;

when the LC oscillation module controls the switch module to be switched on, the second secondary coil charges the charging module, and when the LC oscillation module controls the switch module to be switched off, the first secondary coil charges the charging module.

In one embodiment, the LC oscillating module includes a capacitor C1, a resistor R1, and an inductor L1;

a first end of the capacitor C1 is connected to the dc output terminal, a second end of the capacitor C1 is connected to a first end of the resistor R1, a second end of the resistor R1 is connected to a first end of the inductor L1, and a second end of the inductor L1 is grounded;

the transformation module further comprises a second primary coil, and the second primary coil is multiplexed as the inductor L1.

In one embodiment, the switch module includes a transistor Q1, a base of the transistor Q1 is connected to the first terminal of the capacitor C1, a collector of the transistor Q1 is connected to the second terminal of the first primary winding, and an emitter of the transistor Q1 is grounded.

In one embodiment, the charging module comprises a first isolation unit, a second isolation unit and a charging unit; the first primary coil charges the charging unit through the first isolation unit, and the second primary coil charges the charging unit through the second isolation unit.

In one embodiment, the first isolation unit comprises a diode D1, the second isolation unit comprises a diode D2, and the charging unit comprises a capacitor C2;

the anode of the diode D1 is connected to the first end of the first secondary coil, and the cathode of the diode D1 is connected to the first end of the capacitor C2; an anode of the diode D2 is connected to the first terminal of the second secondary winding, a cathode of the diode D2 is connected to the first terminal of the capacitor C2, and the second terminal of the second secondary winding and the second terminal of the first secondary winding are connected to the second terminal of the capacitor C2, wherein the first terminal of the first primary winding, the second terminal of the first secondary winding, and the first terminal of the second secondary winding are dotted terminals.

In one embodiment, the rectifier module comprises a rectifier bridge.

In one embodiment, the device further comprises a filtering module, and the filtering module is connected with the direct current output end.

In one embodiment, the filtering module includes a capacitor C3, and a first terminal of the capacitor C3 is connected to the dc output terminal and a second terminal thereof is connected to ground.

In one embodiment, the filtering module includes a capacitor C3, and a first terminal of the capacitor C3 is connected to the dc output terminal and a second terminal thereof is connected to ground.

In one embodiment, the leakage inductance absorption module comprises a diode D3, a capacitor C4 and a resistor R2;

an anode of the diode D3 is connected to an emitter of the transistor Q1 and the second terminal of the first primary winding, a cathode of the diode D3 is connected to the first terminal of the capacitor C4 and the first terminal of the resistor R2, and the second terminal of the capacitor C4 and the second terminal of the resistor R2 are connected to the first terminal of the first primary winding.

Above-mentioned auxiliary power source produces resonance and control switch module break-make repeatedly through adopting LC oscillation module, compares and adopts chip control switch module in traditional embodiment, and LC oscillation module in this application is with low costs, and control is convenient, and circuit structure is comparatively simple.

Drawings

FIG. 1 is a schematic diagram of an auxiliary power module according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of an auxiliary power circuit according to an embodiment of the present application.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Referring to fig. 1, an embodiment of the present application provides an auxiliary power supply, which includes a rectification module 100, an LC oscillating module 200, a switching module 300, a transforming module 400, and a charging module 500. The rectifier module 100 includes an ac input terminal and a dc output terminal, and is configured to rectify an ac power source into a dc power source, where the ac power source may be a commercial power. In this embodiment, the rectifier module 100 may be a rectifier bridge. The LC oscillating module 200 is connected to the dc output terminal of the rectifying module 100 for generating resonance. The switch module 300 is connected to the LC oscillating module 200, and is configured to be repeatedly turned on and off by the LC oscillating module 200. The transformation module 400 includes a primary coil and a secondary coil. The primary coil includes a first primary coil, a first end of the first primary coil is connected to the dc output terminal, and a second end of the first primary coil is grounded through the switch module 300. The secondary coil includes a first secondary coil and a second secondary coil, and the first secondary coil and the second secondary coil are connected to the charging module 500, and are used for generating current according to the coupling of the primary coil and charging the charging module 500. The charging module 500 is connected to a load for supplying power to the load. When the LC oscillating module 200 controls the switching module 300 to be turned on, the second secondary coil charges the charging module 500. When the LC oscillating module 200 controls the switching module 300 to be turned off, the first secondary coil charges the charging module.

The LC oscillation module is adopted to generate resonance and control the switch module to be repeatedly switched on and off in the embodiment, and compared with the traditional embodiment in which the chip is adopted to control the switch module, the LC oscillation module in the application is low in cost, convenient to control and simple in circuit structure.

In one embodiment, referring to fig. 2, the LC oscillating module includes a capacitor C1, a resistor R1, and an inductor L1. The capacitor C1, the resistor R1 and the inductor L1 are connected in series, the first end of the capacitor C1 is connected with the direct current output end, the second end of the capacitor C1 is connected with the first end of the resistor R1, the second end of the resistor R1 is connected with the first end of the inductor L1, and the second end of the inductor L1 is grounded. The capacitor C1 and the inductor L1 are connected in series to form an oscillating circuit, and the oscillating frequency can be adjusted by adjusting the resistance values of the capacitor C1 and the resistor R1. In this embodiment, the transformer module 400 further includes a second primary coil, which may be multiplexed as the inductor L1 in the LC oscillating module 200.

The switching module 300 includes a transistor Q1, a base of a transistor Q1 is connected to a first terminal of a capacitor C1, a collector of a transistor Q1 is connected to a second terminal of the first primary winding 410, and an emitter of a transistor Q1 is grounded. In this embodiment, the transistor Q1 may be an NPN type or a PNP type. The LC oscillating module 200 generates a sine wave signal by oscillation, so that the transistor Q1 can be controlled to be repeatedly turned on and off. When the transistor Q1 is turned on, the first primary winding 410 of the transformer module 400 is powered on, the first terminal voltage of the first primary winding 410 is positive, and the second terminal voltage is negative; when the transistor Q1 is turned off, the exciting current in the first primary winding 410 of the transformer module 400 keeps the original direction, the exciting current makes the voltage induced in the first primary winding 410 negative at the first end and positive at the second end, and the secondary winding can induce current according to the energy stored in the primary winding and charge the charging module 500. In the embodiment, the transistor in the traditional technology is replaced by the triode, so that the production cost can be further reduced.

With continued reference to fig. 1, the charging module 500 includes a first isolation unit 510, a second isolation unit 520, and a charging unit 530. The first secondary coil 420 charges the charging unit 530 through the first isolation unit 510, and the second secondary coil 430 charges the charging unit 530 through the second isolation unit 520. A first terminal of the first isolation unit 510 is connected to a first terminal of the first secondary coil 420, and a second terminal of the first isolation unit 510 is connected to a first terminal of the charging unit 530. A first terminal of the second isolation unit 520 is connected to a first terminal of the second secondary coil 430, and a second terminal of the second isolation unit 520 is connected to a first terminal of the charging unit 530. The second terminal of the first secondary coil 420 and the second terminal of the second secondary coil 430 are connected to the second terminal of the charging unit 530.

Specifically, referring to fig. 2, the first isolation unit 510 includes a diode D1, the second isolation unit 520 includes a diode D2, and the charging unit includes a capacitor C2. The anode of the diode D1 is connected to the first end of the first secondary coil 420, and the cathode of the diode D1 is connected to the first end of the capacitor C2. An anode of the diode D2 is connected to the first terminal of the second secondary coil 430, and a cathode of the diode D2 is connected to the first terminal of the capacitor C2. The second terminal of the second secondary winding and the second terminal of the first secondary winding 420 are connected to the second terminal of the capacitor C2. In this embodiment, the first end of the first primary coil 410, the second end of the first secondary coil 420, and the first end of the second secondary coil 430 are homonymous ends.

When the transistor Q1 is turned on, the first primary winding 410 of the transformer module 400 is powered on, and the voltage at the first terminal of the first primary winding 410 is positive and the voltage at the second terminal is negative. Since the first terminal of the first primary winding 410, the second terminal of the first secondary winding 420, and the first terminal of the second secondary winding 430 are dotted terminals, the voltage of the second terminal of the first secondary winding 420 is positive, the voltage of the first terminal is negative, the diode D1 is turned off, and the first secondary winding 420 cannot charge the capacitor C2. When the voltage at the first terminal of the second secondary winding 430 is positive and the voltage at the second terminal is negative, the diode D2 is turned on, and the second secondary winding 430 charges the capacitor C2 through the diode D2.

When the transistor Q1 is turned off, the exciting current in the first primary winding 410 of the transformer module 400 keeps the original direction, and the exciting current makes the voltage induced in the first primary winding 410 be negative at the first end and positive at the second end. The first terminal voltage of the first secondary winding 420 is positive, the second terminal voltage is negative, the diode D1 is turned on, and the first secondary winding 420 charges the capacitor C2 through the diode D1. The first terminal of the second secondary winding 430 is negative, the diode D2 is turned off, and the second secondary winding 430 cannot charge the capacitor C2.

In one embodiment, the auxiliary power supply further includes a filtering module for filtering the rectified dc signal. In this example. The filtering module comprises a capacitor C3, wherein a first end of the capacitor C3 is connected with the direct current output end, and a second end of the capacitor C3 is grounded.

In one embodiment, the auxiliary power supply further includes a leakage inductance absorption module connected to two ends of the first primary winding 410 for absorbing leakage inductance of the first primary winding 410. The leakage inductance absorption module comprises a diode D3, a capacitor C4 and a resistor R2. An anode of the diode D3 is connected to the emitter of the transistor Q1 and the second terminal of the first primary winding 410, a cathode of the diode D3 is connected to the first terminal of the capacitor C4 and the first terminal of the resistor R2, and the second terminal of the capacitor C4 and the second terminal of the resistor R2 are connected to the first terminal of the first primary winding 410.

The auxiliary power supply provided by the embodiment adopts the LC resonance circuit to replace a chip in the traditional technology, adopts the triode to replace a transistor in the traditional technology, utilizes the LC resonance circuit to control the repeated on-off of the triode, and has simple circuit structure and low cost.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. An auxiliary power supply, comprising: rectifier module, LC oscillation module, switch module, vary voltage module, the module of charging, wherein:

the rectification module comprises an alternating current input end and a direct current output end and is used for rectifying an alternating current power supply into a direct current power supply;

the LC oscillating module is connected with the direct current output end and used for generating resonance;

the switch module is connected with the LC oscillation module and is used for being repeatedly switched on and off under the action of the LC oscillation module;

the voltage transformation module comprises a primary coil and a secondary coil, wherein the primary coil comprises a first primary coil, the first end of the first primary coil is connected with the direct current output end, and the second end of the first primary coil is grounded through the switch module; the secondary coil comprises a first secondary coil and a second secondary coil, the first secondary coil and the second secondary coil are connected with the charging module and used for generating current according to the coupling of the primary coil and charging the charging module, and the charging module is connected with a load and used for supplying power to the load;

when the LC oscillation module controls the switch module to be switched on, the second secondary coil charges the charging module, and when the LC oscillation module controls the switch module to be switched off, the first secondary coil charges the charging module.

2. The auxiliary power supply of claim 1, wherein the LC oscillating module comprises a capacitor C1, a resistor R1, and an inductor L1;

a first end of the capacitor C1 is connected to the dc output terminal, a second end of the capacitor C1 is connected to a first end of the resistor R1, a second end of the resistor R1 is connected to a first end of the inductor L1, and a second end of the inductor L1 is grounded;

the transformation module further comprises a second primary coil, and the second primary coil is multiplexed as the inductor L1.

3. The auxiliary power supply of claim 2, wherein the switching module comprises a transistor Q1, a base of the transistor Q1 is connected to the first terminal of the capacitor C1, a collector of the transistor Q1 is connected to the second terminal of the first primary winding, and an emitter of the transistor Q1 is grounded.

4. The auxiliary power supply of claim 3, wherein the charging module comprises a first isolation unit, a second isolation unit, and a charging unit; the first primary coil charges the charging unit through the first isolation unit, and the second primary coil charges the charging unit through the second isolation unit.

5. The auxiliary power supply of claim 4, wherein the first isolation unit comprises a diode D1, the second isolation unit comprises a diode D2, and the charging unit comprises a capacitor C2;

the anode of the diode D1 is connected to the first end of the first secondary coil, and the cathode of the diode D1 is connected to the first end of the capacitor C2; an anode of the diode D2 is connected to the first terminal of the second secondary winding, a cathode of the diode D2 is connected to the first terminal of the capacitor C2, and the second terminal of the second secondary winding and the second terminal of the first secondary winding are connected to the second terminal of the capacitor C2, wherein the first terminal of the first primary winding, the second terminal of the first secondary winding, and the first terminal of the second secondary winding are dotted terminals.

6. The auxiliary power supply of claim 5, wherein the rectifier module comprises a rectifier bridge.

7. The auxiliary power supply of claim 6, further comprising a filter module, said filter module being connected to said DC output.

8. The auxiliary power supply of claim 7, wherein the filtering module comprises a capacitor C3, a first terminal of the capacitor C3 is connected to the DC output terminal, and a second terminal is connected to ground.

9. The auxiliary power supply of claim 8, further comprising a leakage inductance absorption module having a first end connected to a first end of the first primary coil and a second end connected to a second end of the first primary coil.

10. The auxiliary power supply of claim 9, wherein the leakage inductance absorption module comprises a diode D3, a capacitor C4, and a resistor R2;

an anode of the diode D3 is connected to an emitter of the transistor Q1 and the second terminal of the first primary winding, a cathode of the diode D3 is connected to the first terminal of the capacitor C4 and the first terminal of the resistor R2, and the second terminal of the capacitor C4 and the second terminal of the resistor R2 are connected to the first terminal of the first primary winding.

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