CN100588100C - Rectifying device - Google Patents

Abstract

The invention discloses a rectifying device, comprising: the transformer device, the rectifying circuit, the first filter capacitor (C1) and the second filter capacitor (C2); the rectifying circuit is connected to two ends of the voltage transformation device, the anode of the first filter capacitor (C1) is connected with the middle tap of the secondary winding of the voltage transformation device, the anode of the second filter capacitor (C2) is connected with the first output end of the rectifying circuit, the cathode of the first filter capacitor (C1) and the cathode of the second filter capacitor (C2) are connected with the second output end of the rectifying circuit, the second output end of the rectifying circuit is grounded, the output voltage of the first output end of the rectifying circuit is the first output voltage of the rectifying device, and the output voltage of the middle tap of the secondary winding of the transformer is the second output voltage of the rectifying device. The rectifying device provided by the embodiment of the invention can provide two paths of output voltages with voltage doubling relation, the withstand voltage of the diode is reduced by half compared with a full-wave rectifying circuit, and the cross regulation rate of the two paths of output voltages is good.

Description

Rectifier

technical field

The invention relates to the field of circuits, in particular to a rectifying device.

Background technique

Please refer to FIG. 1 , which is an existing rectifying device capable of providing two output voltages. The rectifying device includes: a transformer T1, four diodes D1, D2, D3, D4, and two filter capacitors C1 and C2. It can be seen from Figure 1 that the primary winding of the transformer T1 is connected to the AC voltage, and the first secondary winding and the second secondary winding of the transformer T1 share a middle tap, wherein the first secondary winding and the diodes D3 and D4 constitute the first full circuit Wave rectification circuit, one end of the filter capacitor C1 is connected to the voltage output end of the first full-wave rectification circuit, and the other end is grounded, the output voltage of the first full-wave rectification circuit after filtering is V1; the second secondary winding of the transformer T1, the diode D1 and D2 constitutes the second full-wave rectification circuit. One end of the filter capacitor C2 is connected to the voltage output end of the first full-wave rectification circuit, and the other end is grounded. After filtering, the output voltage of the second full-wave rectification circuit is V2.

In the existing rectifier device capable of providing two output voltages, the transformer T1 needs to have two secondary windings. If the transformer T1 cannot lay down the two secondary windings due to structural reasons, the two output voltages cannot be obtained.

Contents of the invention

The technical problem to be solved by the present invention is to provide a rectifying device, which only requires one output winding of the transformer to obtain two output voltages in a voltage doubling relationship.

In order to solve the problems of the technologies described above, the purpose of the present invention is achieved through the following technical solutions:

A rectification device, comprising: a voltage transformation device, a rectification circuit, a first filter capacitor (C1), and a second filter capacitor (C2);

The rectifier circuit is connected to both ends of the secondary winding of the transformer device, the anode of the first filter capacitor (C1) is connected to the middle tap of the secondary winding of the transformer device, and the anode of the second filter capacitor (C2) is connected to the first tap of the rectifier circuit. One output terminal, the cathode of the first filter capacitor (C1) and the cathode of the second filter capacitor (C2) are connected to the second output terminal of the rectifier circuit, the second output terminal of the rectifier circuit is grounded, and the output voltage of the first output terminal of the rectifier circuit is The first output voltage of the rectifying device, and the output voltage of the intermediate tap of the secondary winding of the transforming device are the second output voltage of the rectifying device.

Wherein, the above-mentioned rectification circuit specifically includes: a first diode (D1), a second diode (D2), a third diode (D3), and a fourth diode (D4):

The anode of the third diode (D3) is connected with the cathode of the first diode (D1), and is connected with one end of the secondary winding of the transformer device;

The cathode of the third diode (D3) is connected to the cathode of the fourth diode (D4), and the anode of the fourth diode is connected to the other end of the secondary winding of the transformer, wherein the third diode The junction between the cathode and the cathode of the fourth diode is the first output end of the rectification circuit;

The anode of the first diode (D1) is connected to the anode of the second diode (D2), and the cathode of the second diode (D2) is connected to the other end of the secondary winding of the transformer, wherein the first two The junction of the anode of the pole diode (D1) and the anode of the second diode (D2) is the second output end of the rectification circuit, and the second output end is grounded.

Preferably, the above-mentioned transforming device includes a transformer, the secondary winding of the transformer is a secondary winding with a center tap, and the secondary winding of the transformer constitutes the secondary winding of the transforming device.

Preferably, the above-mentioned transformer device includes a first transformer and a second transformer;

The rectifier circuit is connected between the terminal with the same name of the secondary winding of the first transformer and the terminal with the same name of the secondary winding of the second transformer, wherein the terminal with the same name of the primary winding of the first transformer and the terminal of the same name of the primary winding of the second transformer The opposite end of the primary winding of the first transformer is connected with the opposite end of the primary winding of the second transformer; the secondary winding of the first transformer and the secondary winding of the second transformer constitute the secondary winding of the transformer device, and the secondary winding of the first transformer The junction of the opposite end of the secondary winding of a transformer and the end of the same name of the secondary winding of the second transformer is the middle tap of the secondary winding of the transformer device.

It can be seen from the above technical solutions that the rectification device provided by the embodiment of the present invention can provide two output voltages with a double voltage relationship, and the withstand voltage of the diode in the rectification circuit can be reduced by half compared with the full-wave rectification circuit, and the two output Cross adjustment is good.

Description of drawings

Fig. 1 is the rectifying device that prior art provides;

Fig. 2 is the rectifying device provided by the first embodiment of the present invention;

Fig. 3 is a rectification device provided by the second embodiment of the present invention.

Detailed ways

In order to make the object, technical solution, and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Please refer to FIG. 2 , which shows the rectification device provided by the first embodiment of the present invention, which includes: a transformer T2 , four diodes D1 , D2 , D3 , D4 , and two filter capacitors C1 and C2 .

Among them, the primary side of the transformer T2 is connected to the AC voltage, the secondary side of the transformer T2 is a secondary winding with a center tap, and four diodes D1, D2, D3, D4 form a full-bridge rectifier circuit, which is connected to The two ends of the secondary winding with a center tap, the specific connection relationship is as follows:

The anode of diode D3 and the cathode of diode D1 are connected to one end of the secondary winding of transformer T2, the cathode of diode D3 is connected to the cathode of diode D4, the anode of diode D4 is connected to the other end of the secondary winding of transformer T2, and the anode of diode D1 is connected to diode D2 The anode of the diode D2, the cathode of the diode D2 is connected to the other end of the secondary winding of the transformer T2, the cathode of the filter capacitor C1 is connected to the junction of the anode of the diode D1 and the anode of the diode D2, and the anode of the filter capacitor C1 is connected to the middle of the secondary winding of the transformer T2 Tap, the cathode of the filter capacitor C2 is connected to the anode of the diode D1 and the anode of the diode D2, the anode of the filter capacitor C2 is connected to the cathode of the diode D3 and the diode D4, and the anode of the diode D1 and the anode of the diode D2 are grounded, Wherein, the output voltage of the cathode junction of diode D3 and diode D4 is the first output voltage V1 of the rectifier, and the voltage output by the middle tap of the secondary winding of the transformer is the second output voltage V2 of the rectifier. V1 voltage is twice that of V2.

Wherein, it can be seen from FIG. 2 that while the four diodes D1, D2, D3, and D4 form a full-bridge rectifier circuit, the diodes D1 and D2 also form a full-wave rectifier circuit.

In the embodiment of the present invention, the junction of the cathode of the diode D3 and the cathode of the diode D4 is the first output end of the full bridge rectification circuit; the junction of the anode of the diode D1 and the anode of the diode D2 is the second output end of the full bridge rectification circuit .

The working principle of the rectifier device provided by the first embodiment of the present invention is: in the positive half cycle of the AC voltage, the diode D3 and the diode D2 are turned on, the diode D1 and the diode D4 are turned off, and the first output voltage V1 is equal to the secondary winding of the transformer T2 Output voltage U2, the second output voltage V2 is equal to 0.5 times the output voltage U2 of the secondary winding of the transformer T2, that is, V1 is equal to 2 times V2; in the negative half cycle of the AC voltage, the diode D1 and diode D4 are turned on, and the diode D3 and Diode D2 is cut off, the first output voltage V1 is equal to the output voltage U2 of the secondary winding of the transformer T2, and the second output voltage V2 is equal to 0.5 times the output voltage U2 of the secondary winding of the transformer T2, that is, V1 is equal to 2 times V2. Therefore, the rectifier device provided by the first embodiment of the present invention can provide two output voltages with a doubled voltage relationship, and the withstand voltage of the diode in the full-bridge rectifier circuit can be reduced by half compared with the full-wave rectifier circuit shown in Figure 1, and the two The cross-regulation rate of the channel output is very good.

Please refer to FIG. 3 , which shows the rectification device provided by the second embodiment of the present invention, which includes: a transformer T3 and a transformer T4 , four diodes D1 , D2 , D3 , D4 , and two filter capacitors C1 and C2 .

Among them, the terminal with the same name of the primary winding of the transformer T3 is connected to the terminal of the primary winding of the transformer T4 with the same name, and the terminal with the same name of the primary winding of the transformer T3 is connected with the terminal of the same name of the primary winding of the transformer T4, which is used to input the AC voltage. Diodes D1, D2, D3, and D4 form a full-bridge rectifier circuit, which is connected between the terminal with the same name of the secondary winding of the transformer T3 and the terminal with the same name of the secondary winding of the transformer T4. The specific connection relationship is as follows:

The anode of diode D3 and the cathode of diode D1 are connected to the same-named end of the secondary winding of transformer T3, the cathode of diode D3 is connected to the cathode of diode D4, the anode of diode D4 is connected to the opposite-named end of the secondary winding of transformer T4, and the anode of diode D1 is connected to The anode of diode D2, the cathode of diode D2 is connected to the opposite end of the secondary winding of transformer T2, the cathode of filter capacitor C1 is connected to the junction of the anode of diode D1 and the anode of diode D2, the anode of filter capacitor C1 is connected to the secondary winding of transformer T3 The junction of the opposite end and the same end of the secondary winding of the transformer T4, the cathode of the filter capacitor C2 is connected to the anode of the diode D1 and the anode of the diode D2, the anode of the filter capacitor C2 is connected to the cathode contact of the diode D3 and the diode D4, and the anode of the diode D1 The contact with the anode of the diode D2 is grounded, wherein the output voltage of the cathode contact of the diode D3 and the diode D4 is the first output voltage V1 of the rectification device, and the voltage output by the center tap of the secondary winding of the transformer is the first output voltage of the rectification device. Two output voltages V2.

Wherein, it can be known from FIG. 3 that while the four diodes D1, D2, D3, and D4 form a full-bridge rectifier circuit, the diodes D1 and D2 also form a full-wave rectifier circuit.

The working principle of the sorting device provided by the second embodiment of the present invention is: in the positive half cycle of the AC voltage, the diode D3 and the diode D2 are turned on, the diode D1 and the diode D4 are turned off, and the first output voltage V1 is equal to the secondary winding of the transformer T3 The output voltage U is added to the output voltage U of the secondary winding of the transformer T4, and the second output voltage V2 is equal to the output voltage U of the secondary winding of the transformer T4, that is, V1 is equal to 2 times of V2; the negative half cycle of the AC voltage, the diode D1 and Diode D4 is turned on, diode D3 and diode D2 are turned off, the first output voltage V1 is equal to the output voltage U of the secondary winding of the transformer T3 plus the output voltage U of the secondary winding of the transformer T4, and the second output voltage V2 is equal to that of the transformer T3 The output voltage U of the secondary winding, that is, V1 is equal to 2 times V2. Therefore, the rectifier device provided by the first embodiment of the present invention can provide two output voltages with a double voltage relationship, and the withstand voltage of the diodes in the full-bridge rectifier circuit can be reduced by half compared with the full-wave rectifier circuit shown in Figure 1, and the two The cross-regulation rate of the channel output is very good.

The rectification device provided by the present invention has been introduced in detail above, and the principles and implementation modes of the present invention have been explained by using specific examples in this paper. The description of the above embodiments is only used to help understand the core idea of the present invention; at the same time For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be construed as limiting the present invention.

Claims (3)

1. A rectifier, characterized in that it comprises: a transformer, a rectifier, a first filter capacitor (C1), and a second filter capacitor (C2); The rectifier circuit is connected to both ends of the secondary winding of the transformer device, the anode of the first filter capacitor (C1) is connected to the middle tap of the secondary winding of the transformer device, and the anode of the second filter capacitor (C2) is connected to the first tap of the rectifier circuit. One output terminal, the cathode of the first filter capacitor (C1) and the cathode of the second filter capacitor (C2) are connected to the second output terminal of the rectifier circuit, the second output terminal of the rectifier circuit is grounded, and the output voltage of the first output terminal of the rectifier circuit is The first output voltage of the rectifying device, the output voltage of the intermediate tap of the secondary winding of the transformer device is the second output voltage of the rectifying device; Wherein, the rectification circuit specifically includes: a first diode (D1), a second diode (D2), a third diode (D3), and a fourth diode (D4): The anode of the third diode (D3) is connected with the cathode of the first diode (D1), and is connected with one end of the secondary winding of the transformer device; The cathode of the third diode (D3) is connected to the cathode of the fourth diode (D4), and the anode of the fourth diode is connected to the other end of the secondary winding of the transformer, wherein the third diode The junction between the cathode and the cathode of the fourth diode is the first output end of the rectification circuit; The anode of the first diode (D1) is connected to the anode of the second diode (D2), and the cathode of the second diode (D2) is connected to the other end of the secondary winding of the transformer, wherein the first two The junction of the anode of the pole diode (D1) and the anode of the second diode (D2) is the second output end of the rectification circuit, and the second output end is grounded. 2. The rectifying device according to claim 1, characterized in that the transformer device comprises a transformer, the secondary winding of the transformer is a secondary winding with a center tap, and the secondary winding of the transformer constitutes the The secondary winding of the above-mentioned transformer device. 3. The rectifying device according to claim 1, wherein the transforming device comprises a first transformer and a second transformer; The rectifier circuit is connected between the terminal with the same name of the secondary winding of the first transformer and the terminal with the same name of the secondary winding of the second transformer, wherein the terminal with the same name of the primary winding of the first transformer and the terminal of the same name of the primary winding of the second transformer The opposite end of the primary winding of the first transformer is connected with the opposite end of the primary winding of the second transformer; the secondary winding of the first transformer and the secondary winding of the second transformer constitute the secondary winding of the transformer device, and the secondary winding of the first transformer The junction of the opposite end of the secondary winding of a transformer and the end of the same name of the secondary winding of the second transformer is the middle tap of the secondary winding of the transformer device.

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