Self-excited air pump control device

Abstract

The utility model belongs to circuit control technical field especially relates to a self -excitation formula air pump control device, and the device includes: power end, self -excitation oscillation circuit includes first oscillation circuit, second oscilling circuit, first node and second node, the amplification circuit includes seventh triode and eighth triode, the base of seventh triode is connected with first node, the base of eighth triode is connected with second node, the current spreading circuit is connected with seventh triode, eighth triode, power end respectively, and the current spreading circuit has third node and fourth node respectively, and air pump is connected with third node, fourth node respectively. The device generates complementary square wave signal through first oscillation circuit and second oscillation circuit, and through amplification circuit, current spreading circuit, makes air pump both ends voltage realize positive and negative voltage switching, to drive air pump.

Description

Technical Field

[0001] This application relates to the field of circuit control technology, and in particular to a self-excited air pump control device. Background Technology

[0002] Currently, the control of small air pumps (such as piezoelectric or electromagnetic air pumps) is generally based on application-specific integrated circuits (ICs). These circuits generate high-frequency complementary square wave signals through an MCU or PWM controller, driving an H-bridge or half-bridge circuit composed of MOSFETs or transistors to provide alternating drive voltage to the air pump load. In this approach, the generation of the complementary square wave signal requires an additional controller or dedicated driver chip, leading to increased circuit complexity and cost.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] In view of at least one of the above technical problems, this application provides a self-excited air pump control device.

[0005] This application provides a self-excited air pump control device, the device comprising: Power supply end; The self-excited oscillation circuit includes a first oscillation circuit, a second oscillation circuit, a first node, and a second node. The first terminal of the first oscillation circuit and the first terminal of the second oscillation circuit are respectively connected to the power supply terminal. The second terminal of the first oscillation circuit is connected to the first node. The third terminals of the first oscillation circuit and the third terminal of the second oscillation circuit are grounded together. The fourth terminal of the first oscillation circuit is connected to the fifth terminal of the second oscillation circuit. The fifth terminal of the first oscillation circuit is connected to the fourth terminal of the second oscillation circuit. The second terminal of the second oscillation circuit is connected to the second node. An amplifier circuit, comprising a seventh transistor and an eighth transistor, wherein the base of the seventh transistor is connected to the first node and the base of the eighth transistor is connected to the second node; The current-amplifying and conducting circuit is connected to the seventh transistor, the eighth transistor, and the power supply terminal, and has a third node and a fourth node, respectively. The air pump is connected to the third and fourth nodes respectively.

[0006] The self-excited air pump control device of this application generates complementary square wave signals through a first oscillation circuit and a second oscillation circuit, and drives the air pump by switching the voltage at both ends of the air pump between positive and negative voltages through an amplification circuit and a current-expanding conduction circuit.

[0007] In some possible implementations, the first oscillation circuit includes a first resistor, a second resistor, a first capacitor, and a first transistor. The first terminal of the first capacitor is connected to the first node and the collector of the first transistor. The second terminal of the first capacitor is connected to the fifth terminal of the second oscillation circuit. The emitter of the first transistor and the third terminal of the second oscillation circuit are grounded together. The emitter of the first transistor is connected to the current-amplifying circuit. The base of the first transistor is connected to the fourth terminal of the second oscillation circuit. The first terminals of the first resistor and the second resistor are connected together and are connected to the power supply terminal and the current-amplifying circuit, respectively. The second terminal of the first resistor is connected to the first terminal of the first capacitor, and the second terminal of the second resistor is connected to the second terminal of the first capacitor.

[0008] In some possible implementations, the second oscillation circuit includes a third resistor, a fourth resistor, a second capacitor, and a second transistor. The first terminal of the second capacitor is connected to the second node and the collector of the second transistor, respectively. The second terminal of the second capacitor is connected to the fifth terminal of the first oscillation circuit. The emitter of the second transistor and the third terminal of the first oscillation circuit are grounded together. The emitter of the second transistor is connected to the current-amplifying circuit. The base of the second transistor is connected to the fourth terminal of the first oscillation circuit. The first terminals of the third resistor and the fourth resistor are connected together and are connected to the power supply terminal and the current-amplifying circuit, respectively. The second terminal of the third resistor is connected to the second terminal of the second capacitor, and the second terminal of the fourth resistor is connected to the first terminal of the second capacitor.

[0009] In some possible implementations, the current-amplifying conduction circuit includes a third transistor, a fourth transistor, a fifth transistor, and a sixth transistor. The base of the fourth transistor is connected to the emitter of the seventh transistor, and the emitter of the fourth transistor is connected to the third terminal of the first oscillation circuit. The base of the third transistor is connected to the collector of the eighth transistor, and the emitter of the third transistor is connected to the first terminal of the first oscillation circuit. The collectors of the third and fourth transistors are connected to the third node. The base of the fifth transistor is connected to the collector of the seventh transistor, and the collector of the fifth transistor is connected to the first terminal of the second oscillation circuit. The base of the sixth transistor is connected to the emitter of the eighth transistor, and the emitter of the sixth transistor is connected to the third terminal of the second oscillation circuit. The collector of the sixth transistor and the emitter of the fifth transistor are connected to the fourth node.

[0010] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a partial circuit diagram of the self-excited air pump control device provided in the embodiments of this application; Figure 2 This is a circuit diagram of the self-excited air pump control device provided in the embodiments of this application; Detailed Implementation

[0013] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0014] like Figure 1 and Figure 2 As shown, this embodiment provides a self-excited air pump control device, which includes a power supply terminal, a self-excited oscillation circuit, an amplifier circuit, a current-expanding conduction circuit, and an air pump M.

[0015] The self-excited oscillation circuit includes a first oscillation circuit, a second oscillation circuit, a first node a, and a second node b. The first terminal of the first oscillation circuit and the first terminal of the second oscillation circuit are respectively connected to the power supply terminal VCC. The second terminal of the first oscillation circuit is connected to the first node a. The third terminals of the first oscillation circuit and the third terminal of the second oscillation circuit are grounded together. The fourth terminal of the first oscillation circuit is connected to the fifth terminal of the second oscillation circuit. The fifth terminal of the first oscillation circuit is connected to the fourth terminal of the second oscillation circuit. The second terminal of the second oscillation circuit is connected to the second node b. The amplifier circuit includes a seventh transistor Q7 and an eighth transistor Q8. The base of the seventh transistor Q7 is connected to the first node a, and the base of the eighth transistor Q8 is connected to the second node b. The current-amplifying and conducting circuits are respectively connected to the seventh transistor Q7, the eighth transistor Q8, and the power supply terminal VCC. The current-amplifying and conducting circuits have a third node c and a fourth node b. The air pump M is connected to the third node c and the fourth node b.

[0016] It is worth noting that the seventh and eighth transistors are NPN type transistors.

[0017] When the first oscillation circuit outputs a signal, which is amplified by the seventh transistor Q7, it drives the current-amplifying circuit to conduct. At this time, the voltage at the third node c is negative, and the voltage at the fourth node b is positive, providing current drive to one end of the air pump M coil. When the second oscillation circuit outputs a signal, which is amplified by the eighth transistor Q8, it drives the current-amplifying circuit to conduct. At this time, the voltage at the third node c is positive, and the voltage at the fourth node b is negative, providing current drive to the other end of the air pump M coil. In this way, the first and second oscillation circuits cyclically generate complementary square wave signals, enabling the voltage across the air pump M to switch between positive and negative, thus driving the air pump M.

[0018] The self-excited air pump control device of this application generates complementary square wave signals through a first oscillation circuit and a second oscillation circuit, and through an amplifier circuit and a current-expanding conduction circuit, enables the voltage across the air pump M to switch between positive and negative voltages, thereby driving the air pump M.

[0019] Specifically, the first oscillation circuit includes a first resistor R1, a second resistor R2, a first capacitor C1, and a first transistor Q1. The first terminal of the first capacitor C1 is connected to the first node a and the collector of the first transistor Q1. The second terminal of the first capacitor C1 is connected to the fifth terminal of the second oscillation circuit. The emitter of the first transistor Q1 is grounded together with the third terminal of the second oscillation circuit. The emitter of the first transistor Q1 is connected to the current-amplifying circuit. The base of the first transistor Q1 is connected to the fourth terminal of the second oscillation circuit. The first terminals of the first resistor R1 and the second resistor R2 are connected together and are connected to the power supply terminal VCC and the current-amplifying circuit, respectively. The second terminal of the first resistor R1 is connected to the first terminal of the first capacitor C1, and the second terminal of the second resistor R2 is connected to the second terminal of the first capacitor C1.

[0020] It is worth noting that the first transistor is an NPN transistor.

[0021] Specifically, the second oscillation circuit includes a third resistor R3, a fourth resistor R4, a second capacitor C2, and a second transistor Q2. The first terminal of the second capacitor C2 is connected to the second node b and the collector of the second transistor Q2. The second terminal of the second capacitor C2 is connected to the fifth terminal of the first oscillation circuit. The emitter of the second transistor Q2 is grounded together with the third terminal of the first oscillation circuit. The emitter of the second transistor Q2 is connected to the current-amplifying circuit. The base of the second transistor Q2 is connected to the fourth terminal of the first oscillation circuit. The first terminals of the third resistor R3 and the fourth resistor R4 are connected together and are connected to the power supply terminal VCC and the current-amplifying circuit, respectively. The second terminal of the third resistor R3 is connected to the second terminal of the second capacitor C2. The second terminal of the fourth resistor R4 is connected to the first terminal of the second capacitor C2.

[0022] It is worth noting that the second transistor is an NPN transistor.

[0023] In the first and second oscillation circuits, the first and second capacitors act as coupling feedback between the first and second transistors. The first capacitor feeds back the voltage change at the collector of the first transistor to the base of the second transistor, and the second capacitor feeds back the voltage change at the collector of the second transistor to the base of the first transistor, allowing the first and second transistors to influence each other and generate self-excited oscillation. For example, when the first transistor is turned on, its collector potential decreases, and this change is transmitted to the base of the second transistor through the first capacitor, affecting the operating state of the second transistor.

[0024] Based on this, the first and second transistors generate an oscillation signal by switching between their on and off states. When the first transistor is on, its collector current increases and its collector potential decreases. This change is fed back to the base of the second transistor through the first capacitor, causing the second transistor to switch from off to on. When the second transistor is on, its collector potential decreases, which in turn affects the base of the first transistor through the second capacitor, causing the first transistor to turn off, thus forming a complete oscillation cycle.

[0025] like Figure 1 and Figure 2 As shown, in some embodiments, the current-amplifying conduction circuit includes a third transistor Q3, a fourth transistor Q4, a fifth transistor Q5, and a sixth transistor Q6. The base of the fourth transistor Q4 is connected to the emitter of the seventh transistor Q7, and the emitter of the fourth transistor Q4 is connected to the third terminal of the first oscillation circuit. The base of the third transistor Q3 is connected to the collector of the eighth transistor Q8, and the emitter of the third transistor Q3 is connected to the first terminal of the first oscillation circuit. The collectors of the third transistor Q3 and the fourth transistor Q4 are connected to the third node c. The base of the fifth transistor Q5 is connected to the collector of the seventh transistor Q7, and the collector of the fifth transistor Q5 is connected to the first terminal of the second oscillation circuit. The base of the sixth transistor Q6 is connected to the emitter of the eighth transistor Q8, and the emitter of the sixth transistor Q6 is connected to the third terminal of the second oscillation circuit. The collectors of the sixth transistor Q6 and the emitter of the fifth transistor Q5 are connected to the fourth node b.

[0026] It is worth noting that the third and fifth transistors are PNP transistors, while the fourth and sixth transistors are NPN transistors.

[0027] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In the embodiments of this application, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0029] The above are merely preferred embodiments of this application and do not constitute any limitation on this application. Any person skilled in the art can make many possible variations and modifications to the technical solution of this application, or modify it into equivalent embodiments, without departing from the scope of the technical solution of this application. Therefore, all equivalent changes made based on the shape, structure, and principle of this application without departing from the content of the technical solution of this application should be covered within the protection scope of this application.

Claims

1. A self-excited air pump control device, characterized in that, The device includes: Power supply end; The self-excited oscillation circuit includes a first oscillation circuit, a second oscillation circuit, a first node, and a second node. The first terminal of the first oscillation circuit and the first terminal of the second oscillation circuit are respectively connected to the power supply terminal. The second terminal of the first oscillation circuit is connected to the first node. The third terminals of the first oscillation circuit and the third terminal of the second oscillation circuit are grounded together. The fourth terminal of the first oscillation circuit is connected to the fifth terminal of the second oscillation circuit. The fifth terminal of the first oscillation circuit is connected to the fourth terminal of the second oscillation circuit. The second terminal of the second oscillation circuit is connected to the second node. An amplifier circuit, comprising a seventh transistor and an eighth transistor, wherein the base of the seventh transistor is connected to the first node and the base of the eighth transistor is connected to the second node; A current-amplifying conduction circuit is connected to the seventh transistor, the eighth transistor, and the power supply terminal, respectively. The current-amplifying conduction circuit has a third node and a fourth node. An air pump, which is connected to the third node and the fourth node respectively.

2. The self-excited air pump control device according to claim 1, characterized in that, The first oscillation circuit includes a first resistor, a second resistor, a first capacitor, and a first transistor. The first terminal of the first capacitor is connected to the first node and the collector of the first transistor. The second terminal of the first capacitor is connected to the fifth terminal of the second oscillation circuit. The emitter of the first transistor and the third terminal of the second oscillation circuit are grounded together. The emitter of the first transistor is connected to the current-amplifying conduction circuit. The base of the first transistor is connected to the fourth terminal of the second oscillation circuit. The first terminals of the first resistor and the second resistor are connected together and are connected to the power supply terminal and the current-amplifying conduction circuit, respectively. The second terminal of the first resistor is connected to the first terminal of the first capacitor, and the second terminal of the second resistor is connected to the second terminal of the first capacitor.

3. The self-excited air pump control device according to claim 1, characterized in that, The second oscillation circuit includes a third resistor, a fourth resistor, a second capacitor, and a second transistor. The first terminal of the second capacitor is connected to the second node and the collector of the second transistor, respectively. The second terminal of the second capacitor is connected to the fifth terminal of the first oscillation circuit. The emitter of the second transistor and the third terminal of the first oscillation circuit are grounded together. The emitter of the second transistor is connected to the current-amplifying conduction circuit. The base of the second transistor is connected to the fourth terminal of the first oscillation circuit. The first terminals of the third resistor and the fourth resistor are connected together and are respectively connected to the power supply terminal and the current-amplifying conduction circuit. The second terminal of the third resistor is connected to the second terminal of the second capacitor. The second terminal of the fourth resistor is connected to the first terminal of the second capacitor.

4. The self-excited air pump control device according to claim 1, characterized in that, The current-amplifying conduction circuit includes a third transistor, a fourth transistor, a fifth transistor, and a sixth transistor. The base of the fourth transistor is connected to the emitter of the seventh transistor, and the emitter of the fourth transistor is connected to the third terminal of the first oscillation circuit. The base of the third transistor is connected to the collector of the eighth transistor, and the emitter of the third transistor is connected to the first terminal of the first oscillation circuit. The collectors of the third and fourth transistors are connected to the third node. The base of the fifth transistor is connected to the collector of the seventh transistor, and the collector of the fifth transistor is connected to the first terminal of the second oscillation circuit. The base of the sixth transistor is connected to the emitter of the eighth transistor, and the emitter of the sixth transistor is connected to the third terminal of the second oscillation circuit. The collector of the sixth transistor and the emitter of the fifth transistor are connected to the fourth node.

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