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

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-excited oscillating booster circuits, circuit boards and home appliances

technical field

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

Background technique

Regarding the boost circuit in the market, the "Boost" + switching power supply chip TDA4863 in the switching power supply is generally used as the boosting circuit. However, its disadvantages include high hardware cost, the need for dedicated chips and the waste of resources of peripheral components. Often, many R&D personnel or enterprises ignore the innovation and improvement of this part of the application due to their adherence to the rules and limitations of technological improvement. It directly leads to the occurrence of objective phenomena such as low product reliability, high development process cost, and brand quality decline.

Utility model content

The purpose of the present utility model is to provide a self-excited oscillation booster circuit, which adopts self-excited oscillation + odd-even voltage boosting to realize low-cost voltage boosting output without IC, and realize stable electric control driving voltage of household appliances, Reliable, low cost, stepped output.

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

According to one aspect of the present invention, a self-excited oscillation booster circuit is provided, which includes a transformer T, a self-excited oscillation circuit and a booster circuit. The self-excited oscillation circuit is electrically connected to the input end of the transformer T for storing and releasing the self-excited oscillation PWM energy for the transformer T; and the booster circuit is electrically connected to the output end of the transformer T for converting the The voltage at the output of the transformer T is boosted.

According to an embodiment of the present invention, the self-excited oscillator circuit includes a first triode unit and a second triode unit, wherein the first triode unit is electrically connected to the primary of the transformer T Between the first pin of the winding and the second pin of the auxiliary winding, the second triode unit is electrically connected between the third pin of the auxiliary winding and the fourth pin of the primary winding of the transformer T, wherein the The first pin of the primary winding and the third pin of the auxiliary winding are terminals with the same name, and the second pin of the auxiliary winding and the fourth pin of the primary winding are another terminal with the same name.

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 The first pin of the primary winding of the transformer T, the other end is electrically connected to one end of the second resistor R99, the other end of the second resistor R99 is electrically connected to the control port Vboost_c, and the first transistor Q20 The emitter is electrically connected to the first pin of the primary winding of the transformer T, the base is electrically connected between the first resistor R100 and the second resistor R99, and the collector is electrically connected to the second pin of the auxiliary winding of the transformer T ;as well as

The second triode unit includes 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 to the auxiliary winding of the transformer T The third pin, the other end is connected to the second triode unit capacitor C100, the other end of the second triode unit capacitor C100 is grounded, the emitter of the second triode Q21 is grounded, and the base is electrically connected to The fourth pin of the primary winding of the transformer T is electrically connected between the third resistor R97 and the second triode unit capacitor C100 and the collector.

According to an embodiment of the present invention, the self-excited oscillation circuit further includes a DC power supply, and the DC power supply is 3V and provides electrical energy for the first triode unit.

According to an embodiment of the present invention, the booster circuit (3) includes N groups of booster units, wherein N is an integer greater than or equal to 1.

According to an embodiment of the present invention, when N is 2, the boosting unit is a double boosting unit, including 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, the cathode is electrically connected to the anode of the first capacitor C1, and the cathode of the first capacitor C1 is electrically connected to The seventh pin of the secondary winding of the transformer T, 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, and the cathode is electrically connected to the second capacitor C2 The positive pole of the second capacitor C2 is electrically connected to the fifth pin of the secondary winding of the transformer T, wherein the fifth pin of the secondary winding is the same name as the first pin of the primary winding, and the The seventh pin of the secondary winding and the fourth pin of the primary winding are another terminal with the same name.

According to an embodiment of the present invention, the boosting circuit further includes loads R _load1 and R _load2 to measure the boosted output voltage.

According to another aspect of the present invention, a circuit board is provided. It includes the aforementioned self-excited oscillation booster circuit.

According to yet another aspect of the present invention, a household appliance is provided. It includes the aforementioned circuit board.

An embodiment of the present invention has the following advantages or beneficial effects:

The self-excited oscillating booster circuit of the utility model comprises a transformer T, a self-excited oscillating circuit and a booster circuit. The input end of the transformer T is connected to the self-excited oscillation circuit, and the output end is connected to the booster circuit. The self-excited oscillation circuit realizes the self-excited oscillation PWM energy storage and release of the transformer T. The boosting circuit realizes N times boosting of the voltage at the output terminal of the transformer T.

Description of drawings

The above and other features and advantages of the present invention will become more apparent from the detailed description of example embodiments thereof with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a self-excited oscillation booster circuit according to an exemplary embodiment.

Among them, the reference numerals are described as follows:

1. Transformer T; 2. Self-excited oscillation circuit; 21. First triode unit; 22. Second triode unit; 3. Booster circuit; 31, Double booster unit.

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments, however, can be embodied in various 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 conveyed to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed descriptions will be omitted.

The terms "a", "an", "the", "said" are used to indicate the presence of one or more elements/components/etc; the terms "including" and "having" are used to indicate open-ended inclusive means and means that additional elements/components/etc may be present in addition to the listed elements/components/etc.

As shown in FIG. 1 , FIG. 1 shows a schematic diagram of a self-excited oscillation booster circuit provided by the present invention.

The self-excited oscillation booster circuit in the embodiment of the present invention includes a transformer T1 , a self-excited oscillation circuit 2 and a booster circuit 3 . The self-excited oscillation circuit 2 is electrically connected to the input end of the transformer T1 for storing and releasing the self-excited oscillation PWM energy for the transformer T1; and the booster circuit 3 is electrically connected to the output end of the transformer T1 for converting the output of the transformer T1 Voltage boost.

In a preferred embodiment of the present invention, the self-excited oscillator circuit 2 includes a first triode unit 21 and a second triode unit 22, wherein the first triode unit 21 is electrically connected to the first triode unit of the primary winding of the transformer T1. Between the first pin and the second pin of the auxiliary winding, the second triode unit 22 is electrically connected between the third pin of the auxiliary winding and the fourth pin of the primary winding of the transformer T1. The first triode unit 21 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 the first pin of the primary winding of the transformer T1, and the other end is electrically connected to the first pin of the primary winding of the transformer T1. One end of the second resistor R99, the other end of the second resistor R99 is electrically connected to the control port Vboost_c, and the emitter of the first transistor Q20 is electrically connected to the first pin of the primary winding of the transformer T1, and the base is electrically connected to the first pin of the first transistor Q20. The collector of the resistor R100 and the second resistor R99 is electrically connected to the second pin of the auxiliary winding of the transformer T1. The second triode unit 22 includes 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 to the third pin of the auxiliary winding of the transformer T1, The other end is connected to the second triode unit capacitor C100, the other end of the second triode unit capacitor C100 is grounded, the emitter of the second triode Q21 is grounded, and the base is electrically connected to the third resistor R97 and the second triode The fourth pin of the primary winding of the transformer T1 is electrically connected between the tube unit capacitors C100 and the collector. The self-excited oscillation circuit 2 further includes a DC power supply, which is 3V and provides power for the first triode unit 21 , wherein the first pin of the primary winding and the third pin of the auxiliary winding are the same name terminals, and the second pin of the auxiliary winding is the same name. The pin and the fourth pin of the primary winding are another terminal with the same name.

As shown in Figure 1, 1. The PWM oscillation signal is generated by the self-excited oscillation circuit. Taking the transformer T1 as the center line, the circuit on the left is the self-excited oscillation circuit, and its principle is as follows: Step 1.1: R100/R99 form the steady-state bias operating point of the first transistor Q20. When 3V power is supplied, Q20 is turned on to charge the second triode unit capacitor C100 through the transformer T1 (2-3) and the resistor R97; at this time, the voltage of T10 (2-3) is positive on the top and negative on the bottom. When the second triode unit capacitor C100 is charged and reaches the conduction voltage Vbe_Q21=0.7V of the second triode Q21, the voltage of the second triode Q21 saturated conduction transformer T1 (1-4) is upper positive and lower negative , and at this time, the voltage of the transformer coupling T1 (2-3) is instantly more positive and negative, and the positive feedback is increased. The charging voltage of the second triode unit capacitor C100 rises sharply again. This process is a positive conduction process. Step 1.2: When Ibe_Q21 rises sharply, the current Ice_Q21 of Q21 rises sharply at the same time and enters the saturated conduction state instantaneously. The transformer T1(1-4) appears core saturation due to the sharp rise of Ice_Q21. When the transformer is magnetically saturated, T1(1-4) 4) The current no longer changes and its voltage is instantaneously 0. Since the transformer current cannot change abruptly, T1(1-4) will appear the compensation voltage/current of lower positive and upper negative at this time. Through the transformer coupling relationship T1 (2-3), the voltage is instantly more positive and negative at the bottom. It is precisely because of the polarity change of this voltage that Ibe_Q21 decreases sharply (the second transistor unit capacitor C100 also discharges to Q21 synchronously). At this time The current Ice_Q21 of Q21 also sharply decreases synchronously until Q21 turns off, which is a reverse turn-off process. Step 1.3: Repeat steps 1.1 and 1.22 in this way to realize T1(1-4) self-excited oscillation PWM energy storage and release.

In a preferred embodiment of the present invention, the booster circuit 3 includes N groups of booster units, where N is an integer greater than or equal to 1. When N is 2, the boosting unit is a double boosting unit 31, including a first diode D1, a second diode D2, a first capacitor C1 and a second capacitor C2, wherein the first and second The positive pole of the pole tube D1 is electrically connected to the fifth pin of the secondary winding of the transformer T(1), the negative pole is electrically connected to the positive pole of the first capacitor C1, and the negative pole of the first capacitor C1 is electrically connected to the secondary winding of the transformer T(1). The seventh pin of the secondary winding, 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, and the cathode is electrically connected to the anode of the second capacitor C2, so The negative pole of the second capacitor C2 is electrically connected to the fifth pin of the secondary winding of the transformer T1, wherein the fifth pin of the secondary winding and the first pin of the primary winding are the same name terminals, and the seventh pin of the secondary winding and The fourth pin of the primary winding is another terminal with the same name. The voltage circuit 3 also includes loads R _load1 and R _load2 to measure the boosted output voltage.

As shown in Figure 1, the N-folder voltage step output is realized through the alternate matrix series connection of diodes and capacitors. Step 2.1: When the cycle goes to step 1.1, due to the saturation conduction of the second transistor Q21, Vce_Q21=0V; the voltage of the freewheeling diode D2 is reversely cut off; the power supply 3V excites T1 (1-4) to store energy, according to the transformer T1 (1-4) Coupling relationship with the same name terminal of T1 (5-7) The voltage of T1 (5-7) is positive on the top and negative on the bottom, and the energy of the power supply 3V passes through T1 (5-7)/the first diode D1 to the capacitor C1 is charged, and the output voltage is Vc1=V T1(5-7)=3V. Step 2.2: When the cycle goes to step 1.2, since the second transistor Q21 is turned off, the voltage of T1 (5-7) is down and up according to the coupling relationship between the transformers T1 (1-4) and T1 (5-7) with the same name. Negatively, the energy of the power supply 3V charges the capacitor C2 through T1(5-7)/capacitor C1/second diode D2, and the output voltage Vc2=V T1(5-7)+Vc1=2*3V=6V. Step 2.3: When repeating the cycle 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, and the output voltage Vc3=V T1(5-7) +Vc2-VC1=2*3V=6V, then the output voltage between the positive terminal of C3 and the terminal T1(7) of the transformer is V=V C1+C3=3*3V=9V. Step 2.4: When the cycle 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, and the output voltage Vc4=V T1(5 -7)+VC1+VC3-VC2=2*3V=6V, then the output voltage V=V C2+C4=4*3V=12V between the positive terminal of C4 and the terminal T1(5) of the transformer. Step 2.5: By analogy, repeat steps 2.3-2.4 to realize self-excited oscillator transformer T1(1-4) full-wave rectification N times voltage output, its final capacitor VCn and transformer T1(5) terminal VRload2=N*3V; T1(1 -4) The final capacitor VCn-1 and the terminal Vrload1 of the transformer T1 (7) terminal Vrload1=(n-1)*3V are output by the full-wave rectification N times the voltage.

The circuit board of the embodiment of the present invention includes the aforementioned self-excited oscillation booster circuit.

The household electrical appliance according to the embodiment of the present invention includes the aforementioned circuit board.

Both the circuit board and the home appliances including the circuit board enhance their own functions through a self-excited oscillation booster circuit.

The self-excited oscillation booster circuit of the present invention includes a transformer T1 , a self-excited oscillation circuit 2 and a booster circuit 3 . The input end of the transformer T1 is connected to the self-excited oscillation circuit 2, and the output end is connected to the booster circuit 3. The self-excited oscillation circuit 2 realizes the self-excited oscillation PWM energy storage and release of the transformer T1. The boosting circuit 3 realizes N times boosting of the voltage at the output terminal of the transformer T1. Moreover, the self-excited oscillation booster circuit achieves the advantages of low cost, high accuracy, high efficiency, etc., and improves the reliable use of electronically controlled driving voltage circuits for home appliances; improves the development efficiency of developers, shortens the development cycle, and improves product reliability. Lay a great foundation .

In the embodiments of the present invention, the term "multiple" refers to two or more, unless otherwise expressly defined. Terms such as "installation", "connection" and "fixing" should be understood in a broad sense. For example, "connection" may be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

In the description of the embodiments of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "upper" and "lower" are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the implementation of the present invention. Examples and simplified descriptions are not intended to indicate or imply that the referred device or unit must have a specific direction, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present invention.

In the description of this specification, the terms "one embodiment", "a preferred embodiment", etc. are described to mean that a particular feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one of the embodiments of the present invention. in one embodiment or example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or instance. 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 are only preferred embodiments of the embodiments of the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various modifications and changes may be made to the embodiments of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the embodiments of the present invention shall be included within the protection scope of the embodiments of the present invention.

Claims (9)

1. a self-excited oscillation booster circuit, characterized in that, comprising: Transformer T(1); A self-excited oscillation circuit (2), electrically connected to the input end of the transformer T(1), is used to store and release the self-excited oscillation PWM energy for the transformer T(1); and The booster 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-excited oscillation booster circuit according to claim 1, wherein the self-excited oscillation circuit (2) comprises a first triode unit (21) and a second triode unit (22), Wherein, the first triode unit (21) is electrically connected between the first pin of the primary winding and the second pin of the auxiliary winding of the transformer T(1), and the second triode unit (22) Electrically connected between the third pin of the auxiliary winding and the fourth pin of the primary winding of the transformer T(1), wherein the first pin of the primary winding and the third pin of the auxiliary winding are the same name terminals, so The second pin of the auxiliary winding and the fourth pin of the primary winding are another terminal with the same name. 3. The self-excited oscillation booster 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, One end of the first resistor R100 is electrically connected to the first pin of the primary winding of the transformer T(1), the other end is electrically connected to one end of the second resistor R99, and the other end of the second resistor R99 is electrically connected Connected to the control port Vboost_c, and the emitter of the first transistor Q20 is electrically connected to the first pin of the primary winding of the transformer T(1), and the base is electrically connected to the first resistor R100 and the second resistor R99 The second pin of the auxiliary winding of the transformer T(1) is electrically connected between and the collector; and The second triode unit (22) includes 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 to the transformer T The third pin of the auxiliary winding of (1), the other end is connected to the second triode unit capacitor C100, the other end of the second triode unit capacitor C100 is grounded, and the emitter of the second triode Q21 is grounded , The base is electrically connected between the third resistor R97 and the second triode unit capacitor C100 and the collector is electrically connected to the fourth pin of the primary winding of the transformer T(1). 4 . The self-excited oscillation booster circuit according to claim 3 , wherein the self-excited oscillation circuit ( 2 ) further comprises a DC power supply, and the DC power supply is 3V and is the first triode unit. 5 . (21) Provide electrical energy. 5 . The self-excited oscillation boosting circuit according to claim 1 , wherein the boosting circuit ( 3 ) comprises N groups of boosting units, wherein N is an integer greater than or equal to 1. 6 . 6. The self-excited oscillating booster circuit according to claim 5, characterized in that, when N is 2, the booster unit is a double booster unit (31), comprising a first diode D1, a second A 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), and the cathode is electrically connected to the first The anode of the 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), and 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 is electrically connected to the anode of the second capacitor C2, and the cathode of the second capacitor C2 is electrically connected to the fifth pin of the secondary winding of the transformer T(1). The fifth pin of the secondary winding and the first pin of the primary winding are terminals with the same name, and the seventh pin of the secondary winding and the fourth pin of the primary winding are another terminal with the same name. 7. The self-excited oscillating booster circuit according to claim 6, wherein the booster circuit (3) further comprises loads R _load1 and R _load2 to measure the boosted output voltage. 8 . A circuit board, characterized in that it comprises the self-excited oscillation booster circuit according to any one of the preceding claims 1 to 7 . 9 . A home appliance, comprising the circuit board of claim 8 . 10 .

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