CN218549735U

CN218549735U - Switch control circuit, anion generator and refrigerator

Info

Publication number: CN218549735U
Application number: CN202222659518.9U
Authority: CN
Inventors: 莫仰顺; 宋志忠; 龚春生
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2022-10-10
Filing date: 2022-10-10
Publication date: 2023-02-28
Anticipated expiration: 2032-10-10

Abstract

The utility model discloses a switch control circuit and anion generator, refrigerator. Wherein, this switch control circuit includes: and the feedback circuit is connected between the power supply and the switching tube and used for controlling the switching state of the switching tube through intermittent feedback of an oscillation signal, and the switching tube is connected with the load circuit. Through the utility model discloses, set up intermittent type on-off control, solved the technical problem that load circuit's energy consumption is high among the prior art, reduced load circuit's circuit energy consumption.

Description

Switch control circuit, anion generator and refrigerator

Technical Field

The utility model relates to a circuit control technical field particularly, relates to a switch control circuit and anion generator, refrigerator.

Background

In the prior art, the refrigerator negative ions are a physical means for fresh-keeping and degerming fruits and vegetables, but if the effect of fresh-keeping and degerming is to be met, the negative ion generator needs to work for a long time, and the negative ion concentration in the space can reach the concentration standard of fresh-keeping and degerming for a long time.

In the prior art, the negative ion generating circuit must be in a long-term working state all the time, although the power of the general generator is not high compared with other electric appliances, the energy consumption is high due to the long-term working state.

Aiming at the problem of high energy consumption of the anion generator in the prior art, no effective solution is provided at present.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an in provide a switch control circuit and anion generator, refrigerator to solve the technical problem that anion generator's among the prior art energy consumption is high.

In order to solve the technical problem, the utility model provides a switch control circuit, include: and the feedback circuit is connected between the power supply and the switching tube and used for controlling the switching state of the switching tube through intermittent feedback of an oscillation signal, and the switching tube is connected with the load circuit.

Further, the feedback circuit includes: the transformer comprises a first resistor, an energy storage element and a transformer, wherein the first resistor and the energy storage element are connected in parallel, the first resistor and the energy storage element are connected in parallel to form a loop, and the transformer comprises an auxiliary winding and a primary winding.

Further, the switching tube is an NPN triode, a base of the NPN triode is connected with the auxiliary winding of the transformer to form feedback, a collector is connected with the primary winding of the transformer, and an emitter is grounded.

Further, the switch tube is an NPN triode, and the switch control circuit further includes: and the protection circuit is connected with the switching tube and is used for carrying out current-limiting protection on the base electrode and the collector electrode of the switching tube.

Further, the protection circuit includes: and the second resistor is connected between the base of the switching tube and an auxiliary winding of a transformer of the feedback circuit and protects the base by current-limiting and voltage-dividing.

Further, the protection circuit includes: and the first capacitor is connected between the collector and the emitter of the switching tube and is used for carrying out buffer protection and back-voltage breakdown protection on the switching tube.

Further, the protection circuit includes: and the voltage stabilizing diode is connected between the base electrode of the switching tube and the ground and is used for providing starting voltage for the switching tube and performing overvoltage protection on the base electrode of the switching tube.

According to another aspect of the embodiments of the present application, there is also provided a diagnostic device of an ice thermal storage system, including: the negative ion generator includes the switch control circuit described in the above embodiments.

Further, the negative ion generator further includes: the load circuit is connected with a transformer of the switch control circuit and is used for generating negative ions through high-voltage ionization output by the transformer.

According to another aspect of the embodiments of the present application, there is also provided a refrigerator including the negative ion generator as described in the above embodiments.

Use the technical scheme of the utility model, on-off control circuit includes, feedback circuit connects between power and switch tube for through oscillating signal intermittent type feedback control the on off state of switch tube, the switch tube is connected with load circuit, adopts intermittent control's feedback design, feedback circuit passes through control switch tube, carries out signal feedback between the switch tube, can realize oscillating signal intermittent control switch circuit's on off state. The switching state of the switching tube is intermittently controlled through the feedback circuit, the on-off time of the switching tube is controlled and changed, the switching times of the switching tube in the same time are reduced, the output frequency of the load circuit is reduced, the low-frequency output working state is realized, the output power of the load circuit is reduced, the load circuit is in a low energy consumption state, intermittent on-off control is set, the technical problem that the energy consumption of the load circuit is high in the prior art is solved, and the circuit energy consumption of the load circuit is reduced.

Drawings

Fig. 1 is a flow chart of a switch control circuit according to an embodiment of the present invention;

fig. 2 is a circuit diagram of a switch control circuit in an embodiment of the present invention;

fig. 3 is a waveform diagram of an oscillation signal according to an embodiment of the present invention;

fig. 4 is a block diagram of an anion generator according to an embodiment of the present invention;

fig. 5 is a logic diagram of the anion generator in the embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the embodiments of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.

It should be understood that the term "and/or" as used herein is merely a relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B, may represent: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

The words "if", as used herein, may be interpreted as "at \8230; \8230when" or "when 8230; \823030, when" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.

It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising one of 8230, and" comprising 8230does not exclude the presence of additional like elements in articles or devices comprising the element.

The following describes in detail alternative embodiments of the present invention with reference to the accompanying drawings.

Example 1

Fig. 1 is a block diagram of a switch control circuit according to an embodiment of the present invention, as shown in fig. 1, the circuit includes the following:

the feedback circuit 10 is connected between a power supply and a switching tube and used for intermittently controlling the switching state of the switching tube through an oscillation signal in a feedback manner, and the switching tube is connected with a load circuit;

the feedback circuit of the present embodiment is also referred to as an intermittent feedback circuit.

Optionally, the switch tube of this embodiment is a triode, such as an NPC transistor. The transformer is a boost converter.

The load circuit may be adapted and selected according to the type of functional device, such as a control converter of an anion generator, and the functional device may be a plasma generator, an ozone generator, an igniter, a ballast, etc.

In the oscillation signal of the present embodiment, the feedback circuit generates the oscillation signal when it is turned on, and no oscillation signal is generated when the feedback circuit is turned off.

Through above-mentioned switch control circuit, switch control circuit includes, feedback circuit connects between power and switch tube for through oscillating signal intermittent type feedback control the on off state of switch tube, the switch tube is connected with load circuit, adopts intermittent control's feedback design, feedback circuit carries out signal feedback through controlling the switch tube between the switch tube, can realize oscillating signal intermittent control switch circuit's on off state. The switching state of the switching tube is intermittently controlled through the feedback circuit, the on-off time of the switching tube is controlled and changed, the switching times of the switching tube in the same time are reduced, the output frequency of the load circuit is reduced, the low-frequency output working state is realized, the output power of the load circuit is reduced, the load circuit is in a low energy consumption state, intermittent on-off control is set, the technical problem that the energy consumption of the load circuit is high in the prior art is solved, and the circuit energy consumption of the load circuit is reduced.

In one implementation of this embodiment, the feedback circuit includes: the transformer comprises a first resistor, an energy storage element and a transformer, wherein the first resistor and the energy storage element are connected in parallel, the first resistor and the energy storage element are connected in parallel to form a loop, and the transformer comprises an auxiliary winding and a primary winding.

Compared with a feedback circuit formed by connecting a resistor and a capacitor in series in the related technology, the feedback circuit has the effect of time delay, but the principle is that the feedback time cannot be shortened after the feedback time is not changed. The feedback circuit of the embodiment can shorten the feedback time, and can control the output frequency by adjusting the resistance-capacitance ratio.

As shown in fig. 2, J1 and J3 are power terminals for supplying power, RE1 is a first resistor, and CA3 is an energy storage element. The energy storage element may be a capacitive element or an inductive element, and fig. 2 illustrates a capacitive element as an example.

In an embodiment, the switching tube is an NPN triode, a base (a pole B) of the NPN triode is connected to the auxiliary winding of the transformer to form a feedback, a collector (a pole C) is connected to the primary winding of the transformer, and an emitter (a pole E) is grounded. Fig. 2 is a circuit diagram of the switch control circuit according to the embodiment of the present invention, and QE1 is an NPN transistor.

Taking the switching tube as an NPN transistor as an example, the working principle of the feedback circuit is described here, and as shown in fig. 2, the transformer includes an auxiliary winding L1 and a primary winding L2.

The circuit is electrified, the triode (NPN triode) is conducted through the base electrode of the triode from the CA3 and the L1, and the electricity of the J1 directly passes through the triode through the L2 to form a loop. When the power is switched on, an excitation inductor is generated, then magnetic flux is generated, the magnetic flux can affect the electromotive force of the L1, the homonymous end and the synonym end of the L1 and the L2 are opposite, the L1 obtains an opposite electromotive force, and the triode is cut off through the RE2.

The intermittent control in this embodiment is the time for intermittently turning on the transistor. For example, the transformer can normally operate in the first period, and in the second period, since the capacitor is still discharging, if the capacitor is not completely discharged, the power is not supplied to the triode any more, and no current flows through the L1. When the isoelectric capacitor finishes charging, current and voltage pass through the triode and are conducted again, so that the intermittent control of capacitance feedback is realized.

In some examples, the feedback circuit further includes a current limiting resistor connected between the base of the switching tube and the auxiliary winding of the transformer. See RE2 in fig. 2.

QE1 is an NPN triode which plays a role in controlling conduction and disconnection in a circuit; when the circuit is powered on, a positive voltage is supplied to the B pole through the CA3 and the transformer coil, the triode enters a conducting state, at the moment, current passes through the main winding path of the transformer to generate alternating current flux, and the auxiliary winding induces a reverse electromotive force (negative voltage) to the B pole to force the triode to be cut off.

RE1 and CA3 play a feedback delay role, the energy storage element charges at the moment of electrifying, the feedback circuit is in a conducting state at the moment, the energy storage element is fully filled with the feedback circuit and is in a disconnected state, and the first resistor discharges and consumes the capacitor after the capacitor is fully filled.

When the switch control circuit works, the NPN triode plays a role in controlling conduction and disconnection in the circuit, the circuit supplies positive voltage to the B pole of the NPN triode at the moment of conduction through the CA3 and the transformer coil, the NPN triode enters a conduction state, current passes through the main winding path of the transformer at the moment, alternating current flux is generated, and the auxiliary winding induces a reverse electromotive force (negative voltage) to the B pole of the NPN triode to force the triode to be cut off.

The intermittent control in this embodiment is to control the switching of the load circuit by intermittent oscillation, where the intermittent oscillation is a phenomenon that there is a switching action in a certain period of time and there is no switching action in the next adjacent period of time; the self-vibration flyback boost design is utilized to be connected in parallel with a resistance capacitor of a feedback circuit to form delay feedback, during intermittent feedback, current in the feedback is absorbed through the capacitor CA3, the current for conducting a switching tube is reduced, and the resistor RE1 consumes the current released by the capacitor CA3, so that the effect of acting on-off feedback of the transformer is hindered.

Fig. 3 is the utility model discloses oscillating signal's oscillogram, at the power switch-on power-on moment, energy storage element charges, and the triode switches on this moment, and feedback circuit route is full of to the moment energy storage element, and oscillating signal is through controlling step up transformer transmission energy this moment, corresponds the pulse of the duty cycle in fig. 3. The energy storage element is fully charged, and the auxiliary winding of the transformer is induced by magnetic flux to generate back electromotive force, at this moment, the energy storage element starts to discharge, at this moment, the feedback circuit is not conducted, no oscillation signal is generated, and energy transfer is not carried out, which corresponds to the intermission period in fig. 3. The energy storage element and the first resistor form a loop, the first resistor consumes the energy released by the energy storage element, the size of the energy storage element affects the impact point time and the signal passing time, corresponding to the duration of the working period in fig. 3, and the size of the first resistor affects the discharge time and the no-signal working time, corresponding to the duration of the rest period in fig. 3.

In the present embodiment, the intermittent oscillation is periodically circulated, the intermittent oscillation is to change the original period to form a new control period, the oscillation time in the process is much longer than the working frequency of the transformer, and the working frequency of the transformer is not changed, so that a plurality of transformers can work and oscillate in one intermittent oscillation time period. Therefore, the secondary output state of the transformer can be changed by adding the intermittent oscillation, the self working frequency of the transformer cannot be changed, and the influence on the transformer is avoided.

In an implementation manner of this embodiment, the switch tube is an NPN transistor, and the switch control circuit further includes: and the protection circuit is connected with the switching tube and is used for carrying out current-limiting protection on the base electrode and the collector electrode of the switching tube.

In one example, the protection circuit includes: and the second resistor is connected between the base of the switching tube and an auxiliary winding of a transformer of the feedback circuit and protects the base by current limiting and voltage dividing. This second resistor is a current limiting resistor, see RE2 in fig. 2.

In one example, the protection circuit includes: and the first capacitor is connected between the collector and the emitter of the switching tube and is used for carrying out buffer protection and back-voltage breakdown protection on the switching tube.

In one example, the protection circuit includes: and the voltage stabilizing diode is used for providing starting voltage for the switching tube and performing overvoltage protection on the base electrode of the switching tube. The voltage stabilizing diode is similar to the second resistor and can also play a role in limiting current, the voltage stabilizing diode stabilizes voltage through current, the current is too large or too small, the whole circuit can be limited, and the second resistor plays a role in limiting current through resistor current consumption. The voltage stabilizing diode and the second resistor form a current limiting circuit.

As shown in fig. 2, the second resistor QE1, the first capacitor CA1, and the zener diode DE1. RE2 resistance in figure 2 plays the protection to the switch tube control pole for current-limiting bleeder resistor, DE1 is zener diode, switch on for the triode and cut off and provide steady voltage, can not satisfy the steady voltage's of steady voltage when the diode current that flows through voltage not play the steady voltage effect, otherwise then play the steady voltage effect, can normally work for the switch tube and provide opening voltage, and play the effect of protection switch tube control pole excessive pressure, by zener diode's operating characteristic, can let whole oscillation system turn-off completely, prevent that the switch tube is in little on-state. CA1 is triode buffer capacitor, plays a buffer protection and the effect that the back pressure punctures the switch tube for the switch tube. The switching tube is in a low energy consumption state by controlling the transmission time of oscillation, thereby reducing the output power of the circuit. The load circuit can thus reduce power consumption by using intermittent oscillation control.

In an embodiment of this embodiment, in order to reduce the influence of secondary reverse excitation inductance and leakage inductance existing in the current circuit, and the influence of resonance and damped oscillation, an RCD passive circuit or an active absorption circuit may be further provided in the switch control circuit, so as to reduce the influence and realize optimization of the switch control circuit.

In one example, the structure of the RCD passive circuit includes: freewheeling diodes and parallel connected resistor-capacitors. The freewheeling diode is connected in the same way as the zener diode DE1 in fig. 2, with one end of the freewheeling diode connected to the collector of QE1 and the other end in series (with a parallel resistor-capacitor) connected in parallel to J1.

By adopting the scheme of the embodiment, an intermittent control mode is formed by the self-vibration flyback boost design and the parallel feedback of the resistance capacitor of the feedback circuit, the feedback control changes the time length, the switching times of the power tube in the same time are reduced, the control frequency of the converter is not changed, and the output frequency is reduced. The low-frequency output working state reduces the output power of the circuit, so that the switching tube is in a low-energy consumption state, and the energy consumption of the load circuit is reduced. For example, under the long-term working state of a negative ion generator of a refrigerator, the energy consumption of a circuit is reduced by an intermittent control mode, and the concentration standard of fresh-keeping and bacteria removal can be met.

Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solution of the present invention essentially or the portions contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk), and includes a plurality of instructions for enabling a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to execute the method according to the embodiments of the present invention.

Example 2

As shown in fig. 4, according to the specific embodiment of the present invention, in a second aspect, the present invention provides an anion generator, including the switch control circuit introduced in fig. 1, the present embodiment provides an anion generator, fig. 4 is a structural block diagram of an anion generator according to an embodiment of the present invention, the apparatus includes: the device comprises a switch control circuit 40, an input power supply 42 and a load circuit 44, wherein the load circuit is connected with a transformer of the switch control circuit and is used for generating negative ions through high-voltage ionization output by the transformer.

Optionally, the switch control circuit includes: and the feedback circuit is connected between the power supply and the switching tube and used for controlling the switching state of the switching tube through intermittent feedback of an oscillation signal, and the switching tube is connected with the load circuit.

Optionally, the load circuit comprises a control converter.

Optionally, the feedback circuit includes: the transformer comprises a first resistor, an energy storage element and a transformer, wherein the first resistor and the energy storage element are connected in parallel, the first resistor and the energy storage element are connected in parallel to form a loop, and the transformer comprises an auxiliary winding and a primary winding.

Optionally, the switching tube is an NPN triode, a base of the NPN triode is connected to the auxiliary winding of the transformer to form a feedback, a collector of the NPN triode is connected to the primary winding of the transformer, and an emitter of the NPN triode is grounded.

Optionally, the switch tube is an NPN transistor, and the switch control circuit further includes: and the protection circuit is connected with the switching tube and is used for carrying out current-limiting protection on the base electrode and the collector electrode of the switching tube.

Optionally, the protection circuit includes: and the second resistor is connected between the base of the switching tube and an auxiliary winding of a transformer of the feedback circuit and protects the base by current limiting and voltage dividing.

Optionally, the protection circuit includes: and the first capacitor is connected between the collector and the emitter of the switching tube and is used for carrying out buffer protection and back-voltage breakdown protection on the switching tube.

Optionally, the protection circuit includes: and the voltage stabilizing diode is connected between the base electrode of the switching tube and the ground and is used for providing starting voltage for the switching tube and performing overvoltage protection on the base electrode of the switching tube.

Fig. 5 is a logic diagram of an anion generator in an embodiment of the present invention, including: the DC12V input filter, the inverse voltage protection circuit, the switch control circuit, the feedback control intermittent signal, the boost converter and the high voltage output. The DC12V input filter is used as a power supply end and is used as the input of the switch control circuit, after the switch control circuit outputs voltage to the boost converter, a feedback control intermittent signal is generated and fed back to the switch control circuit, and a switch tube of the switch control circuit has high-voltage output in a conducting state. The feedback control intermittent signal is generated by an auxiliary winding of the transformer, a capacitor of the feedback circuit and a resistor connected between the base of the switching tube and the auxiliary winding of the transformer of the feedback circuit.

It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in different processors in any combination.

Example 3

This embodiment provides a refrigerator, according to the utility model discloses a specific embodiment, the third aspect, the utility model provides a refrigerator, including the anion generator that figure 4 introduced.

Alternatively, the ionizer includes a switching control circuit described in fig. 1.

Optionally, the negative ion generator further comprises an input power supply and a load circuit, wherein the load circuit is connected with the transformer of the switch control circuit and is used for generating negative ions through high-voltage ionization output by the transformer.

Optionally, the load circuit comprises a control converter.

Optionally, the switch control circuit includes: and the feedback circuit is connected between the power supply and the switching tube and used for intermittently controlling the switching state of the switching tube through oscillation signals in a feedback manner, and the switching tube is connected with the load circuit.

Optionally, the load circuit comprises a control converter.

Optionally, the switch tube is an NPN triode, and the switch control circuit further includes: and the protection circuit is connected with the switching tube and is used for carrying out current-limiting protection on the base electrode and the collector electrode of the switching tube.

The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.

Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment may be implemented by software plus a necessary general hardware platform, and may also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A switch control circuit, comprising:

and the feedback circuit is connected between the power supply and the switching tube and used for controlling the switching state of the switching tube through intermittent feedback of an oscillation signal, and the switching tube is connected with the load circuit.

2. The circuit of claim 1, wherein the feedback circuit comprises: the transformer comprises a first resistor, an energy storage element and a transformer, wherein the first resistor and the energy storage element are connected in parallel and form a loop, and the transformer comprises an auxiliary winding and a primary winding.

3. The switch control circuit according to claim 2, wherein the switching tube is an NPN transistor, a base of the NPN transistor is connected to the auxiliary winding of the transformer to form a feedback, a collector of the NPN transistor is connected to the primary winding of the transformer, and an emitter of the NPN transistor is grounded.

4. The switch control circuit of claim 1, wherein the switching transistor is an NPN transistor, the switch control circuit further comprising: and the protection circuit is connected with the switching tube and is used for carrying out current-limiting protection on the base electrode and the collector electrode of the switching tube.

5. The switch control circuit of claim 4, wherein the protection circuit comprises:

and the second resistor is connected between the base of the switching tube and an auxiliary winding of a transformer of the feedback circuit and protects the base by current-limiting and voltage-dividing.

6. The switch control circuit of claim 4, wherein the protection circuit comprises:

and the first capacitor is connected between the collector and the emitter of the switching tube and is used for carrying out buffer protection and back-voltage breakdown protection on the switching tube.

7. The switch control circuit of claim 4, wherein the protection circuit comprises: and the voltage stabilizing diode is connected between the base electrode of the switching tube and the ground and is used for providing starting voltage for the switching tube and performing overvoltage protection on the base electrode of the switching tube.

8. An ionizer characterized in that the ionizer comprises the switching control circuit according to any one of claims 1 to 7.

9. The negative ion generator according to claim 8, further comprising: the load circuit is connected with a transformer of the switch control circuit and used for generating negative ions through high-voltage ionization output by the transformer.

10. A refrigerator characterized by comprising the anion generator of claim 8 or 9.