Single-winding multi-output circuit, power supply and electronic equipment

Abstract

The utility model discloses a single-winding multi-output circuit, a power supply and electronic equipment. The single-winding multi-output circuit comprises a transformer, a first output end, a first energy storage module and a second output end, the first output end is connected to the secondary end of the transformer; one end of the first energy storage module is connected to the secondary end; the second output end is connected to the first energy storage module. By adding one or more energy storage modules, the requirement of multi-path output can be met, feedback detection and output precision can be increased according to different requirements, increase of element cost in a traditional mode is avoided, and the requirement of a miniaturized circuit board is met.

Description

Technical Field

[0001] The utility model relates to a single-winding multi-channel output circuit, a power supply and electronic equipment, belonging to the technical field of power supplies. Background Art

[0002] Take the printer power supply as an example. There are multiple high-voltage outputs in the power supply. The output voltage is mostly between 1KV-3KV, and the current is within 1mA. Such output parameter requirements require the output winding of the transformer to be as high as several thousand turns. The following methods are often used in the prior art to achieve multiple high-voltage outputs:

[0003] Method 1: Figure 1 As shown, the switching transformer adopts a large transformer with multiple pins and large slot width, including a primary main winding N1, an auxiliary winding N2, a secondary high-voltage winding N3 and a secondary high-voltage winding N4;

[0004] Method 2: Figure 2 As shown, the switching transformer uses multiple small transformers with single output, such as switching transformer T1 and switching transformer T2.

[0005] However, for the above-mentioned prior art, although both methods can solve the problem of multi-channel output, the transformer in method one is too large, and the number of transformers in method two is too large, which not only increases the cost of components, but also makes it difficult to place larger components or multiple components into a small circuit board for today's miniaturized power boards. Utility Model Content

[0006] In view of this, the utility model provides a single-winding multi-channel output circuit, a power supply and an electronic device.

[0007] In a first aspect, an embodiment of the utility model provides a single-winding multi-channel output circuit, comprising: a transformer, a first output terminal, a first energy storage module, and a second output terminal;

[0008] The first output terminal is connected to the secondary terminal of the transformer;

[0009] One end of the first energy storage module is connected to the secondary end;

[0010] The second output end is connected to the first energy storage module.

[0011] As a preferred embodiment of the present utility model, the first output terminal includes a diode D5, a capacitor C10 and a load RL1;

[0012] The diode D5 is connected in series with the secondary end, and the capacitor C10 and the load RL1 are both connected in parallel to the series structure of the secondary end and the diode D5.

[0013] As a preferred implementation of the present utility model, the first energy storage module includes: a capacitor C14.

[0014] As a preferred embodiment of the present utility model, the second output terminal includes a diode D8, a capacitor C17 and a load RL2;

[0015] The diode D8 is connected in series with the other end of the first energy storage module, and the capacitor C17 and the load RL2 are both connected in parallel with the diode D8.

[0016] As a preferred implementation of the present utility model, the second output end further includes a feedback module, one end of the feedback module is connected in series to the other end of the first energy storage module, and the other end of the feedback module is grounded.

[0017] As a preferred embodiment of the present utility model, the feedback module includes a resistor R39, a resistor R89 ​​and a capacitor C26;

[0018] The other end of the first energy storage module, the resistor R39 and the resistor R89 ​​are connected in series in sequence and then grounded;

[0019] Capacitor C26 is connected in parallel across resistor R89;

[0020] A feedback detection terminal is connected between the resistor R39 and the resistor R89.

[0021] As a preferred implementation manner of the utility model, it also includes a capacitor C12, which is connected in series to the secondary end and grounded.

[0022] As a preferred embodiment of the utility model, it also includes a second energy storage module and a third output terminal;

[0023] One end of the second energy storage module is connected to the secondary end;

[0024] The third output terminal is connected to the second energy storage module.

[0025] In a second aspect, the utility model further provides a power supply, which includes a single-winding multi-channel output circuit as in any embodiment of the utility model.

[0026] In a third aspect, the present invention further provides an electronic device, the electronic device comprising a power supply as in any embodiment of the present invention.

[0027] Compared with the prior art, the utility model has the following beneficial effects:

[0028] The embodiment of the utility model can meet the requirements of multi-channel output by adding one or more energy storage modules, and can also increase feedback detection and output accuracy according to different needs, avoiding the increase in component costs in traditional methods and meeting the requirements of miniaturized circuit boards. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0030] Figure 1 A circuit diagram of a multi-channel output circuit in the prior art;

[0031] Figure 2 A circuit diagram of a multi-channel output circuit in the prior art;

[0032] Figure 3 It is a module schematic diagram of a single-winding multi-channel output circuit in an embodiment of the utility model;

[0033] Figure 4 It is a circuit diagram of a single-winding multi-channel output circuit in an embodiment of the utility model;

[0034] Figure 5 The present invention is a circuit diagram of a single-winding multi-channel output circuit in an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0036] Example:

[0037] First, as Figure 3 As shown, the embodiment of the utility model provides a single-winding multi-channel output circuit, including: a transformer 100, a first output terminal 200, a first energy storage module 300 and a second output terminal 400;

[0038] The first output terminal 200 is connected to the secondary terminal 110 of the transformer 100;

[0039] One end of the first energy storage module 300 is connected to the secondary end 110;

[0040] The second output terminal 400 is connected to the first energy storage module 300 .

[0041] The embodiment of the utility model can meet the requirements of multi-channel output by adding a first energy storage module and a second output terminal, avoiding the increase in component cost caused by the use of large-size transformers or multiple small transformers with single-channel output in the traditional method, and meeting the requirements of miniaturized circuit boards.

[0042] The transformer in the utility model also includes a primary end, and the output end preferably includes a primary main winding and an auxiliary winding. The secondary end of the transformer in the utility model is a single secondary high-voltage winding, and the output voltage is generally between 1KV-3KV.

[0043] As a preferred embodiment of the present invention, refer to Figure 4 , the first output end includes a diode D5, a capacitor C10 and a load RL1;

[0044] The diode D5 is connected in series with the secondary end, and the capacitor C10 and the load RL1 are both connected in parallel to the series structure of the secondary end and the diode D5.

[0045] The diode D5 can be set to rectify the output voltage of the secondary end, and then filter it through the capacitor C10 before providing it to the load RL1, thereby meeting the needs of the first output end, which is the first output of the circuit.

[0046] The diode D5 used for rectification has no restrictions on positive and negative connections and can be flexibly set to obtain the required positive and negative output voltages.

[0047] As a preferred embodiment of the present invention, refer to Figure 4 The first energy storage module includes: capacitor C14. The capacitor C14 in the present invention is preferably a high-voltage resistant energy storage capacitor, which can transmit the output voltage of the secondary end to the second output end due to its AC-passing and DC-isolating characteristics.

[0048] As a preferred embodiment of the present invention, refer to Figure 4 , the second output end includes a diode D8, a capacitor C17 and a load RL2;

[0049] The diode D8 is connected in series with the other end of the first energy storage module, and the capacitor C17 and the load RL2 are both connected in parallel to the diode D8.

[0050] The diode D8 can be set to rectify the output voltage after energy storage by the capacitor C14, and then filter it through the capacitor C17 before providing it to the load RL2, thereby also meeting the needs of the second output terminal, which is the second output of the circuit.

[0051] The diode D8 used for rectification has no restrictions on its positive or negative connection and can be flexibly set to obtain the required positive or negative output voltage.

[0052] As a preferred embodiment of the present invention, refer to Figure 5 The second output end 400 further includes a feedback module 410 , one end of the feedback module 410 is connected in series to the other end of the first energy storage module 300 , and the other end of the feedback module 410 is grounded.

[0053] As a preferred embodiment of the present utility model, the feedback module 410 includes a resistor R39, a resistor R89 ​​and a capacitor C26;

[0054] The other end of the first energy storage module, the resistor R39 and the resistor R89 ​​are connected in series in sequence and then grounded;

[0055] The capacitor C26 is connected in parallel to both ends of the resistor R89;

[0056] A feedback detection terminal is connected between the resistor R39 and the resistor R89.

[0057] When the accuracy of the output voltage or output current of the power supply is required to be above 10%, the accuracy can be controlled to be within at least 5% after adding the feedback module 410. The output voltage of the second output terminal can be detected at the feedback detection terminal.

[0058] As a preferred embodiment of the present invention, refer to Figure 4-5 , further comprising a capacitor C12, the capacitor C12 being connected in series to the secondary end and grounded. The arrangement of the capacitor C12 can make the two groups of outputs not share a common ground, thus avoiding interference between the groups of outputs.

[0059] As a preferred embodiment of the utility model, it also includes a second energy storage module and a third output terminal;

[0060] One end of the second energy storage module is connected to the secondary end;

[0061] The third output terminal is connected to the second energy storage module.

[0062] Among them, the structure and connection method of the second energy storage module and the third output terminal in the utility model are the same as the structure and connection method of the first energy storage module and the second output terminal, thereby realizing the third output. Similarly, an Nth energy storage module or an Nth output terminal can also be set to realize multi-channel output. Each output terminal can be connected to a capacitor and then grounded to avoid interference between each group of outputs.

[0063] The working principle of the single winding multi-channel output circuit of the utility model embodiment is as follows:

[0064] First output: The voltage output of the secondary end of the transformer first passes through the rectifier diode D5, then through the filter capacitor C10, and finally to the load RL1;

[0065] Because the output current is within the 1 mA level, a first energy storage module, or multiple energy storage modules such as the first and second energy storage modules can be added to supply power to other output lines.

[0066] Second output: A high-voltage resistant energy storage capacitor C14 is connected in parallel to the secondary end. Due to its AC-passing and DC-isolating characteristics, the output voltage of the secondary end can also be transmitted to the rectifier diode D8, then through the filter capacitor C17, and finally to the load RL2 to achieve the second output;

[0067] Similarly, if there are multiple outputs, multiple high-voltage energy storage capacitors can be connected in parallel and then connected to the corresponding loads to meet the multiple outputs.

[0068] In a second aspect, the utility model further provides a power supply, which includes a single-winding multi-channel output circuit as in any embodiment of the utility model.

[0069] In a third aspect, the present invention further provides an electronic device, the electronic device comprising a power supply as in any embodiment of the present invention.

[0070] The above is only a preferred embodiment of the utility model patent, but the protection scope of the utility model patent is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the scope disclosed by the utility model patent according to the technical solution and utility model concept of the utility model patent, which are all within the protection scope of the utility model patent.

Claims

1. A single-winding multi-channel output circuit, characterized in that: include: A transformer, a first output terminal, a first energy storage module, and a second output terminal; The first output terminal is connected to the secondary terminal of the transformer; One end of the first energy storage module is connected to the secondary end; The second output end is connected to the first energy storage module.

2. The single-winding multi-channel output circuit according to claim 1, characterized in that: The first output terminal includes a diode D5, a capacitor C10 and a load RL1; The diode D5 is connected in series with the secondary end, and the capacitor C10 and the load RL1 are both connected in parallel to the series structure of the secondary end and the diode D5.

3. The single-winding multi-channel output circuit according to claim 1, characterized in that: The first energy storage module includes: a capacitor C14.

4. The single-winding multi-channel output circuit according to claim 1, characterized in that: The second output terminal includes a diode D8, a capacitor C17 and a load RL2; The diode D8 is connected in series with the other end of the first energy storage module, and the capacitor C17 and the load RL2 are both connected in parallel to the diode D8.

5. The single-winding multi-channel output circuit according to claim 4, characterized in that: The second output end further includes a feedback module, one end of the feedback module is connected in series to the other end of the first energy storage module, and the other end of the feedback module is grounded.

6. The single-winding multi-channel output circuit according to claim 5, characterized in that: The feedback module includes a resistor R39, a resistor R89 ​​and a capacitor C26; The other end of the first energy storage module, the resistor R39 and the resistor R89 ​​are connected in series in sequence and then grounded; The capacitor C26 is connected in parallel to both ends of the resistor R89; A feedback detection terminal is connected between the resistor R39 and the resistor R89.

7. The single-winding multi-channel output circuit according to claim 1, characterized in that: The device further includes a capacitor C12, which is connected in series to the secondary end and grounded.

8. The single-winding multi-channel output circuit according to claim 1, characterized in that: Also includes a second energy storage module and a third output terminal; One end of the second energy storage module is connected to the secondary end; The third output terminal is connected to the second energy storage module.

9. A power supply, characterized in that: The power supply comprises the single-winding multi-output circuit according to any one of claims 1-8.

10. An electronic device, characterized in that: The electronic device comprises the power supply as claimed in claim 9.

Images