CN216819716U

CN216819716U - Self-oscillation booster circuit, circuit board and household electrical appliance

Info

Publication number: CN216819716U
Application number: CN202122758034.5U
Authority: CN
Inventors: 李耀聪; 潘叶江
Original assignee: Vatti Co Ltd
Current assignee: Vatti Co Ltd
Priority date: 2021-11-11
Filing date: 2021-11-11
Publication date: 2022-06-24
Anticipated expiration: 2031-11-11

Abstract

The utility model provides a self-oscillation boosting circuit, a circuit board and household electrical appliance equipment. The self-oscillation boosting circuit comprises a transformer T, a self-oscillation circuit and a boosting circuit. The self-oscillation circuit is electrically connected with the input end of the transformer T and is used for storing and releasing self-oscillation PWM energy for the transformer T; and the boosting circuit is electrically connected to the output end of the transformer T and is used for boosting the voltage of the output end of the transformer T. The self-oscillation boosting circuit adopts self-oscillation and odd-even voltage-multiplying boosting to realize IC-free low-cost voltage boosting output and realize stable, reliable, low-cost and stepped output of household electrical control driving voltage.

Description

Self-oscillation booster circuit, circuit board and household electrical appliance

Technical Field

The utility model relates to the technical field of electric control driving boosting, in particular to a self-oscillation boosting circuit.

Background

In general, a Boost circuit and a switching power supply chip TDA4863 in a switching power supply are adopted as a Boost circuit in the market. However, the disadvantages include high hardware cost, dedicated chip and excessive waste of peripheral device resources. Often, how many developers or enterprises neglect innovative improvement of the part of applications due to ink conservation and technical improvement limitation. Directly causes objective phenomena such as low product reliability, high development process cost, reduced brand quality and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a self-oscillation boosting circuit which adopts self-oscillation and odd-even voltage multiplication to realize IC-free low-cost voltage boosting output and realizes stable, reliable, low-cost and stepped output of household electrical control driving voltage.

In order to realize the purpose of the utility model, the utility model adopts the following technical scheme:

according to an aspect of the present invention, there is provided a self-oscillation boosting circuit including a transformer T, a self-oscillation circuit, and a boosting circuit. The self-excited oscillation circuit is electrically connected with the input end of the transformer T and is used for storing and releasing self-excited oscillation PWM energy for the transformer T; and the boosting circuit is electrically connected to the output end of the transformer T and is used for boosting the voltage of the output end of the transformer T.

According to an embodiment of the present invention, the self-oscillation circuit includes a first triode unit and a second triode unit, wherein the first triode unit is electrically connected between a first pin of a primary winding of the transformer T and a second pin of an auxiliary winding, and the second triode unit is electrically connected between a third pin of the auxiliary winding of the transformer T and a fourth pin of the primary winding, wherein the first pin of the primary winding and the third pin of the auxiliary winding are homonymous terminals, and the second pin of the auxiliary winding and the fourth pin of the primary winding are the other homonymous terminal.

According to an embodiment of the present invention, the first triode unit includes a first triode Q20, a first resistor R100 and a second resistor R99, wherein one end of the first resistor R100 is electrically connected to a first pin of a primary winding of the transformer T, the other end of the first resistor R100 is electrically connected to one end of the second resistor R99, the other end of the second resistor R99 is electrically connected to a control port Vboost _ c, an emitter of the first triode Q20 is electrically connected to the first pin of the primary winding of the transformer T, a base of the first triode Q20 is electrically connected between the first resistor R100 and the second resistor R99, and a collector of the first triode Q20 is electrically connected to a second pin of an auxiliary winding of the transformer T; and

the second triode unit comprises a second triode Q21, a third resistor R97 and a second triode unit capacitor C100, wherein one end of the third resistor R97 is electrically connected with a third pin of an auxiliary winding of the transformer T, the other end of the third resistor R97 is connected with the second triode unit capacitor C100, the other end of the second triode unit capacitor C100 is grounded, an emitter electrode of the second triode Q21 is grounded, a base electrode of the second triode Q21 is electrically connected between the third resistor R97 and the second triode unit capacitor C100, and a collector electrode of the second triode Q21 is electrically connected with a fourth pin of a primary winding of the transformer T.

According to an embodiment of the present invention, the self-oscillation circuit further includes a dc power supply, and the dc power supply is 3V and supplies power to the first triode unit.

According to one embodiment of the present invention, the boosting circuit (3) includes N sets of boosting units, where N is an integer greater than or equal to 1.

According to an embodiment of the present invention, when N is 2, the voltage boost unit is a double voltage boost unit, and includes a first diode D1, a second diode D2, a first capacitor C1, and a second capacitor C2, wherein the anode of the first diode D1 is electrically connected with the fifth pin of the secondary winding of the transformer T, the cathode is electrically connected with the anode of the first capacitor C1, the cathode of the first capacitor C1 is electrically connected with the seventh pin of the secondary winding of the transformer T, the anode of the second diode D2 is electrically connected with the anode of the first capacitor C1 and the cathode of the first diode D1, the cathode is electrically connected with the anode of the second capacitor C2, the negative pole of the second capacitor C2 is electrically connected to the fifth pin of the secondary winding of the transformer T, the fifth pin of the secondary winding and the first pin of the primary winding are homonymous terminals, and the seventh pin of the secondary winding and the fourth pin of the primary winding are the other homonymous terminal.

According to an embodiment of the present invention, the voltage boost circuit further comprises a load R_load1And R_load2To measure the boosted output voltage.

According to another aspect of the present invention, a circuit board is provided. The self-oscillation boosting circuit comprises the self-oscillation boosting circuit.

According to yet another aspect of the present invention, a home appliance is provided. Which comprises the circuit board.

One embodiment of the present invention has the following advantages or benefits:

the utility model discloses a self-oscillation boosting circuit which comprises a transformer T, a self-oscillation circuit and a boosting circuit. The input end of the transformer T is connected with the self-oscillation circuit, and the output end of the transformer T is connected with the booster circuit. The self-oscillation circuit realizes self-oscillation PWM energy storage and release of the transformer T. The boosting circuit realizes N times of boosting of the voltage of the output end of the transformer T.

Drawings

The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Fig. 1 is a schematic diagram illustrating a self-oscillating boost circuit according to an exemplary embodiment.

Wherein the reference numerals are as follows:

1. a transformer T; 2. a self-excited oscillation circuit; 21. a first triode unit; 22. a second triode unit; 3. a voltage boost circuit; 31. a double pressurizing unit.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

The terms "a," "an," "the," "said" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.

As shown in fig. 1, fig. 1 is a schematic diagram of a self-oscillating boost circuit according to the present invention.

The self-oscillation boosting circuit of the embodiment of the utility model comprises a transformer T1, a self-oscillation circuit 2 and a boosting circuit 3. The self-oscillation circuit 2 is electrically connected with the input end of the transformer T1 and is used for storing and releasing self-oscillation PWM energy for the transformer T1; and the boosting circuit 3 is electrically connected to the output terminal of the transformer T1 for boosting the voltage at the output terminal of the transformer T1.

In a preferred embodiment of the present invention, the self-oscillation circuit 2 comprises a first transistor unit 21 and a second transistor unit 22, wherein the first transistor unit 21 is electrically connected between a first pin of the primary winding of the transformer T1 and a second pin of the auxiliary winding, and the second transistor unit 22 is electrically connected between a third pin of the auxiliary winding of the transformer T1 and a fourth pin of the primary winding. The first triode unit 21 comprises a first triode Q20, a first resistor R100 and a second resistor R99, wherein one end of the first resistor R100 is electrically connected to a first pin of a primary winding of a transformer T1, the other end of the first resistor R100 is electrically connected to one end of a second resistor R99, the other end of the second resistor R99 is electrically connected to a control port Vboost _ c, an emitter of the first triode Q20 is electrically connected to a first pin of a primary winding of the transformer T1, a base of the first triode Q20 is electrically connected between the first resistor R100 and the second resistor R99, and a collector of the first triode Q20 is electrically connected to a second pin of an auxiliary winding of the transformer T1. The second triode unit 22 comprises a second triode Q21, a third resistor R97 and a second triode unit capacitor C100, wherein one end of the third resistor R97 is electrically connected with a third pin of the auxiliary winding of the transformer T1, the other end of the third resistor R97 is connected with the second triode unit capacitor C100, the other end of the second triode unit capacitor C100 is grounded, the emitter electrode of the second triode Q21 is grounded, the base electrode of the second triode Q21 is electrically connected between the third resistor R97 and the second triode unit capacitor C100, and the collector electrode of the second triode Q21 is electrically connected with a fourth pin of the primary winding of the transformer T1. The self-oscillation circuit 2 further includes a dc power supply, which is 3V and supplies power to the first triode unit 21, wherein the first pin of the primary winding and the third pin of the auxiliary winding are terminals of the same name, and the second pin of the auxiliary winding and the fourth pin of the primary winding are terminals of the same name.

As shown in fig. 1, the PWM oscillation signal generation is realized by a self-oscillation circuit. The transformer T1 is used as a central line, and the left circuit is a self-excited oscillation circuit, and the principle is as follows: step 1.1: R100/R99 constitute the steady state bias operating point of the first triode Q20. When the power is supplied by 3V, the Q20 is conducted to charge the capacitor C100 of the second triode unit through the transformer T1(2-3) and the resistor R97; the voltage of T10(2-3) at this time is positive at the top and negative at the bottom. When the second transistor unit capacitor C100 is charged to reach the conduction voltage Vbe _ Q21 of the second transistor Q21, which is 0.7V, the voltage of the second transistor Q21 saturated conduction transformer T1(1-4) is positive, negative, and at this time, the voltage is momentarily more positive, negative, and positive feedback is formed by the transformer coupling T1(2-3) to increase the charging voltage of the second transistor unit capacitor C100, and the charging voltage rises again sharply, which is a forward conduction process. Step 1.2: when Ibe _ Q21 sharply rises, current Ice _ Q21 of Q21 sharply rises synchronously and instantly enters a saturated conduction state, transformer T1(1-4) is saturated by core due to sharp rise of Ice _ Q21, and when the transformer is saturated magnetically, the current of T1(1-4) does not change any more, so that the voltage thereof is instantly 0. Since the transformer current cannot change abruptly, T1(1-4) will generate lower positive and upper negative compensation voltages/currents. The voltage is instantaneously more positive, negative, and positive through the transformer coupling relation T1(2-3), and the polarity change of the voltage causes the Ibe _ Q21 to sharply decrease (the second triode unit capacitor C100 also discharges to Q21 synchronously), and at this time, the current Ice _ Q21 of Q21 also sharply decreases synchronously until Q21 is cut off, and this process is a reverse cut-off process. Step 1.3: therefore, step 1.1 and step 1.22 are repeated again, and T1(1-4) self-oscillation PWM energy storage and release are realized.

In a preferred embodiment of the present invention, the boosting circuit 3 includes N sets of boosting units, where N is an integer greater than or equal to 1. When N is 2, the pressure is increasedThe unit is a double-frequency boosting unit 31 and comprises a first diode D1, a second diode D2, a first capacitor C1 and a second capacitor C2, wherein the anode of the first diode D1 is electrically connected with the fifth pin of the secondary winding of the transformer T (1), the cathode of the first diode D1 is electrically connected with the anode of the first capacitor C1, the cathode of the first capacitor C1 is electrically connected with the seventh pin of the secondary winding of the transformer T (1), the anode of the second diode D2 is electrically connected with the anode of the first capacitor C1 and the cathode of the first diode D1, the cathode of the second capacitor C2 is electrically connected with the anode of the second capacitor C2, the cathode of the second capacitor C2 is electrically connected with the fifth pin of the secondary winding of the transformer T1, the fifth pin of the secondary winding and the first pin of the primary winding are dotted terminals, and the seventh pin of the secondary winding and the fourth pin of the primary winding are the other dotted terminal. The voltage circuit 3 further comprises a load R_load1And R_load2To measure the boosted output voltage.

As shown in fig. 1, the N-times voltage step output is realized by the alternate matrix type series connection of the diode + the capacitor. Step 2.1: when the step 1.1 is circulated, the second triode Q21 is in saturated conduction, and Vce _ Q21 is 0V; the voltage of the freewheeling diode D2 is cut off in the reverse direction; the power supply 3V excites the T1(1-4) to store energy, the voltage of the T1(5-7) is positive, negative and positive according to the same-name end coupling relation of the transformer T1(1-4) and the T1(5-7), the energy of the power supply 3V charges the capacitor C1 through the T1 (5-7)/the first diode D1, and the output voltage Vc 1-V T1(5-7) -3V. Step 2.2: when the process is repeated to the step 1.2, because the second triode Q21 is turned off, the voltage of the T1(5-7) is negative, positive and negative according to the same-name end coupling relation between the transformer T1(1-4) and the transformer T1(5-7), the energy of the power supply 3V charges the capacitor C2 through the T1 (5-7)/the capacitor C1/the second diode D2, and the output voltage Vc2 ═ V T1(5-7) + Vc1 ═ 2 ═ 3V ═ 6V. Step 2.3: when the loop is repeated to step 1.1, the energy of the power supply 3V charges the capacitors C3 and C1 through T1 (5-7)/capacitor C2/third diode D3, the output voltage Vc3 ═ V T1(5-7) + Vc2-Vc1 ═ 2 ═ 3V ═ 6V, and the output voltage V between the positive terminal of C3 and the terminal of the transformer T1(7) ═ V C1+ C3 ═ 3V ═ 9V. Step 2.4: when the loop is repeated to step 1.2, the energy of the power supply 3V charges the capacitors C4 and C2 through T1 (5-7)/capacitor C1/capacitor C3/fourth diode D4, the output voltage Vc4 ═ V T1(5-7) + Vc1+ Vc3-Vc2 ═ 2 ═ 3V ═ 6V, and the output voltage V between the positive terminal of C4 and the terminal of the transformer T1(5) ═ V C2+ C4 ═ 4 ═ 3V ═ 12V. Step 2.5: by analogy, repeating the steps of loop 2.3-2.4 to realize full-wave rectification and N-fold voltage output of the self-oscillation transformer T1(1-4), wherein the final capacitor VCn and the terminal VRload2 of the transformer T1(5) are N × 3V; t1(1-4) full-wave rectifies the N-times voltage to output its final capacitor VCn-1 and Vrload1 of transformer T1(7) as (N-1) × 3V.

The circuit board of the embodiment of the utility model comprises the self-oscillation boosting circuit.

The household appliance provided by the embodiment of the utility model comprises the circuit board.

The circuit board and the household appliance comprising the circuit board enhance the functions of the circuit board and the household appliance through the self-oscillation boosting circuit.

The self-oscillation boosting circuit comprises a transformer T1, a self-oscillation circuit 2 and a boosting circuit 3. The input end of the transformer T1 is connected with the self-oscillation circuit 2, and the output end is connected with the booster circuit 3. The self-oscillation circuit 2 realizes the self-oscillation PWM energy storage and release of the transformer T1. The boosting circuit 3 realizes the N-time boosting of the voltage at the output end of the transformer T1. The self-excited oscillation booster circuit has the advantages of low cost, high accuracy, high efficiency and the like, and the reliable use of the household electrical control driving voltage circuit is promoted; the development efficiency of developers is improved, the development period is shortened, and the product reliability is improved, thereby laying a great foundation.

In embodiments of the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.

In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or units must have a specific direction, be configured in a specific orientation, and operate, and thus, should not be construed as limiting the embodiments of the present invention.

In the description herein, the appearances of the phrase "one embodiment," "a preferred embodiment," or the like, are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the present embodiment by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims

1. A self-oscillating boost circuit, comprising:

a transformer T (1);

the self-excited oscillation circuit (2) is electrically connected to the input end of the transformer T (1) and is used for storing and releasing self-excited oscillation PWM energy for the transformer T (1); and

and the boosting circuit (3) is electrically connected to the output end of the transformer T (1) and is used for boosting the voltage of the output end of the transformer T (1).

2. The self-oscillating voltage boost circuit according to claim 1, wherein said self-oscillating circuit (2) comprises a first triode unit (21) and a second triode unit (22), wherein said first triode unit (21) is electrically connected between a first pin of a primary winding and a second pin of an auxiliary winding of said transformer T (1), and said second triode unit (22) is electrically connected between a third pin of an auxiliary winding and a fourth pin of a primary winding of said transformer T (1), wherein said first pin of a primary winding and said third pin of an auxiliary winding are homonymous terminals, and said second pin of an auxiliary winding and said fourth pin of a primary winding are the other homonymous terminal.

3. The self-oscillation voltage boosting circuit according to claim 2, wherein the first triode unit (21) comprises a first triode Q20, a first resistor R100 and a second resistor R99, wherein one end of the first resistor R100 is electrically connected to a first pin of the primary winding of the transformer T (1), the other end of the first resistor R100 is electrically connected to one end of the second resistor R99, the other end of the second resistor R99 is electrically connected to a control port Vboost _ c, an emitter of the first triode Q20 is electrically connected to the first pin of the primary winding of the transformer T (1), a base of the first triode Q20 is electrically connected between the first resistor R100 and the second resistor R99, and a collector of the first triode Q20 is electrically connected to a second pin of the auxiliary winding of the transformer T (1); and

the second triode unit (22) comprises a second triode Q21, a third resistor R97 and a second triode unit capacitor C100, wherein one end of the third resistor R97 is electrically connected with a third pin of an auxiliary winding of the transformer T (1), the other end of the third resistor R97 is connected with the second triode unit capacitor C100, the other end of the second triode unit capacitor C100 is grounded, an emitter electrode of the second triode Q21 is grounded, a base electrode of the second triode Q21 is electrically connected between the third resistor R97 and the second triode unit capacitor C100, and a collector electrode of the second triode Q21 is electrically connected with a fourth pin of a primary winding of the transformer T (1).

4. The self-oscillating boost circuit according to claim 3, characterized in that said self-oscillating circuit (2) further comprises a dc power supply, said dc power supply being 3V and supplying power to said first triode unit (21).

5. The self-oscillating booster circuit according to claim 1, wherein the booster circuit (3) comprises N groups of booster cells, where N is an integer greater than or equal to 1.

6. A self-oscillation voltage-boosting circuit according to claim 5, wherein when N is 2, the voltage-boosting unit is a double voltage-boosting unit (31) comprising a first diode D1, a second diode D2, a first capacitor C1 and a second capacitor C2, wherein the anode of the first diode D1 is electrically connected to the fifth pin of the secondary winding of the transformer T (1), the cathode of the first diode D1 is electrically connected to the anode of the first capacitor C1, the cathode of the first capacitor C1 is electrically connected to the seventh pin of the secondary winding of the transformer T (1), the anode of the second diode D2 is electrically connected to the anode of the first capacitor C1 and the cathode of the first diode D1, the cathode of the first diode C2 is electrically connected to the anode of the second capacitor C2, and the cathode of the second diode D381 is electrically connected to the fifth pin of the secondary winding, wherein the fifth pin of the secondary winding and the first pin of the primary winding are of the same name, and the seventh pin of the secondary winding and the fourth pin of the primary winding are the other terminals with the same name.

7. Self-oscillating voltage-boosting circuit according to claim 6, wherein the voltage-boosting circuit (3) further comprises a load R_load1And R_load2To measure the boosted output voltage.

8. A circuit board comprising the self-oscillating voltage boost circuit of any of the preceding claims 1 to 7.

9. An electrical household appliance comprising the circuit board of claim 8.