Second-order frequency divider with high-frequency protection

Abstract

The utility model relates to a second-order frequency divider with high-frequency protection. The second-order frequency divider comprises a signal input end positive electrode, a signal input end negative electrode, an inductor L1, an inductor L2, a capacitor C1, a capacitor C2, a PTC thermistor R2, a woofer, a tweeter and a high-frequency protection unit. The signal input end, the inductor L1, the woofer and the negative electrode of the signal input end are sequentially connected in series, the signal input end, the capacitor C2, the high-frequency protection unit, the tweeter and the negative electrode of the signal input end are sequentially connected in series, the capacitor C2 is further connected with the negative electrode of the signal input end through the inductor L2, and the PTC thermistor R2 is connected to the two ends of the high-frequency protection unit in parallel. The high-frequency protection unit is a bulb R1 or a bulb R1 formed by connecting at least two phases in series; after the PTC thermistor R2 is switched off, the high-pitch loudspeaker can continuously make a sound, and the power to be borne by the high-pitch loudspeaker is reduced, so that the effect of protecting the high-pitch loudspeaker is achieved; and the intensity of the current passing through the tweeter can be intuitively known through the brightness of the bulb.

Description

Technical Field

[0001] The utility model relates to the technical field of second-order frequency dividers, in particular to a second-order frequency divider with high-frequency protection. Background Art

[0002] Figure 1 The schematic diagram of the existing two-frequency second-order divider is shown in FIG. 1 , in which a thermistor R11 is connected in series in the high-frequency circuit.

[0003] Thermistor R11 can be placed before or after capacitor C21. Thermistor R11 acts as a switch in this circuit.

[0004] Under normal conditions, the internal resistance of thermistor R11 is only about 0.1 ohms, but when the signal current passing through is greater than its rated current, thermistor R11 will be disconnected (its internal resistance is infinite at this time), and the signal cannot reach the high-frequency speaker.

[0005] When the current passing through is less than its rated current, the thermistor will slowly return to the on state, thereby protecting the high-frequency speaker. However, in this protection state, the high-frequency speaker will not make any sound.

[0006] Therefore, in the utility model patent application, the applicant carefully studied a second-order frequency divider with high-frequency protection to solve the above-mentioned problem. Utility Model Content

[0007] The utility model aims to overcome the deficiencies in the above-mentioned prior art and has the main purpose of providing a second-order frequency divider with high-frequency protection, which can allow the tweeter to continue to make sound after the PTC thermistor R2 is disconnected, and the power to be borne by the tweeter is reduced, thereby protecting the tweeter; the current intensity passing through the tweeter can also be intuitively understood through the brightness of the bulb.

[0008] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0009] A second-order frequency divider with high-frequency protection includes a positive electrode of a signal input terminal, a negative electrode of a signal input terminal, an inductor L1, an inductor L2, a capacitor C1, a capacitor C2, a PTC thermistor R2, a woofer, a tweeter and a high-frequency protection unit;

[0010] The signal input terminal, the inductor L1, the woofer and the negative electrode of the signal input terminal are connected in series in sequence, the signal input terminal, the capacitor C2, the high-frequency protection unit, the tweeter and the negative electrode of the signal input terminal are connected in series in sequence, the capacitor C2 is also connected to the negative electrode of the signal input terminal through the inductor L2, and the PTC thermistor R2 is connected in parallel to both ends of the high-frequency protection unit;

[0011] The high frequency protection unit is a bulb R1 or at least two bulbs R1 connected in series.

[0012] A second-order frequency divider with high-frequency protection includes a positive electrode of a signal input terminal, a negative electrode of a signal input terminal, an inductor L1, an inductor L2, a capacitor C1, a capacitor C2, a PTC thermistor R2, a woofer, a tweeter and a high-frequency protection unit;

[0013] The signal input terminal, the inductor L1, the woofer and the negative electrode of the signal input terminal are connected in series in sequence, the signal input terminal, the capacitor C2, the high-frequency protection unit, the tweeter and the negative electrode of the signal input terminal are connected in series in sequence, the capacitor C2 is also connected to the negative electrode of the signal input terminal through the inductor L2, and the PTC thermistor R2 is connected in parallel to both ends of the high-frequency protection unit;

[0014] The high frequency protection unit is a bulb R1 or at least two bulbs connected in series.

[0015] As a preferred solution, the inductor L1 is 1.0 mH.

[0016] As a preferred solution, the inductor L2 is 0.5 mH.

[0017] As a preferred solution, the capacitor C1 is a 10uF capacitor C1.

[0018] As a preferred solution, the capacitor C2 is a 2.2uF capacitor C2.

[0019] As a preferred solution, the light bulb is a 50W / 24V light bulb.

[0020] Compared with the prior art, the utility model has obvious advantages and beneficial effects. Specifically, it mainly connects the bulb R1 and the PTC thermistor R2 in parallel. On the one hand, after the PTC thermistor R2 is disconnected, the tweeter can continue to make sound, and the power ratio of the power consumed by the bulb R1 P (bulb R1) and the power consumed by P (tweeter 22) is not constant, and will increase with the increase of the power passing through the line. The power consumed by the power P (bulb R1) will increase, and then the power to be borne by the tweeter will be reduced, thereby protecting the tweeter. On the other hand, when the current passing through increases, the brightness of the bulb will increase, and then the current intensity passing through the tweeter can be intuitively understood through the brightness of the bulb.

[0021] In order to more clearly illustrate the structural features and effects of the present invention, it is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a schematic diagram of the circuit structure of the prior art;

[0023] Figure 2 It is a schematic diagram of the circuit structure of an embodiment of the utility model.

[0024] Description of Figure Numbers:

[0025] 10. High frequency protection unit

[0026] 21. Woofer 22. Tweeter DETAILED DESCRIPTION

[0027] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0028] Please refer to Figure 2 As shown, it shows the specific structure of the preferred embodiment of the utility model, which is a second-order frequency divider with high-frequency protection, including a positive electrode of a signal input terminal, a negative electrode of a signal input terminal, an inductor L1, an inductor L2, a capacitor C1, a capacitor C2, a PTC thermistor R2, a woofer 21, a tweeter 22 and a high-frequency protection unit 10;

[0029] In this embodiment, the inductor L1 is an inductor L1 of 1.0 mH; the inductor L2 is an inductor L2 of 0.5 mH; the capacitor C1 is a capacitor C1 of 10 uF; and the capacitor C2 is a capacitor C2 of 2.2 uF.

[0030] The signal input terminal, the inductor L1, the woofer 21 and the negative electrode of the signal input terminal are connected in series in sequence, the signal input terminal, the capacitor C2, the high-frequency protection unit 10, the tweeter 22 and the negative electrode of the signal input terminal are connected in series in sequence, the capacitor C2 is also connected to the negative electrode of the signal input terminal through the inductor L2, and the PTC thermistor R2 is connected in parallel to both ends of the high-frequency protection unit 10;

[0031] In this embodiment, the PTC thermistor R2 acts as a switch. Under normal conditions, the internal resistance of the PTC thermistor R2 is only about 0.1 ohms, but when the signal current passing through it is greater than its rated current, the PTC thermistor R2 will heat up, and the temperature will quickly reach its Curie point. The PTC thermistor R2 will instantly be in a high-resistance state and then disconnected, and the signal cannot reach the tweeter 22 through the branch where the PTC thermistor R2 is located.

[0032] The high-frequency protection unit 10 is a bulb R1 or at least two bulbs R1 connected in series. In this embodiment, the high-frequency protection unit 10 is a bulb R1, and the PTC thermistor R2 is connected in parallel to both ends of the bulb R1. Preferably, the bulb R1 is a 50W / 24V bulb.

[0033] The function of the bulb R1 is: when the signal current passing through the PTC thermistor R2 is too large, it is in a disconnected state, and the signal can only pass through the bulb R1 to reach the tweeter 22. Because the bulb R1 has a resistance value, according to the different powers of the bulb R1, its internal resistance is 0.5 to 2 ohms at room temperature, so it will inevitably consume power.

[0034] The total power P0 of the circuit where the tweeter 22 is located = P(bulb R1) + P(PTC thermistor R2) + P(tweeter 22). When the PTC thermistor R2 is disconnected, the power consumed by the bulb R1 will change according to the current passing through it. The smaller the current passing through, the smaller the power consumed. Conversely, the larger the current passing through, the larger the power consumed. This solves the problem that the tweeter 22 has no sound when the PTC thermistor R2 is disconnected. The bulb R1 can consume the circuit power, which reduces the power that the tweeter 22 has to bear, thereby protecting the tweeter 22.

[0035] It should be noted that the ratio of the power consumed by the bulb R1, P(bulb R1) to the power consumed by the tweeter 22, is not constant, and will increase as the power passing through the line increases, and then the power to be borne by the tweeter 22 decreases, so that the tweeter 22 can be protected while allowing the tweeter 22 to emit sound.

[0036] The key point of the design of the present invention is that it is mainly achieved by connecting the bulb R1 and the PTC thermistor R2 in parallel. On the one hand, after the PTC thermistor R2 is disconnected, the tweeter can continue to make sound, and the power ratio of the power consumed by the bulb R1 P(bulb R1) to the power consumed by P(tweeter 22) is not constant, and will increase with the increase of the power passing through the line. The power consumed by the power P(bulb R1) will increase, and then the power to be borne by the tweeter will be reduced, thereby playing a role in protecting the tweeter; on the other hand, when the current passing through increases, the brightness of the bulb will increase, and then the current intensity passing through the tweeter can be intuitively understood through the brightness of the bulb.

[0037] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A second-order frequency divider with high-frequency protection, characterized in that: It includes a positive electrode of a signal input terminal, a negative electrode of a signal input terminal, an inductor L1, an inductor L2, a capacitor C1, a capacitor C2, a PTC thermistor R2, a woofer, a tweeter and a high-frequency protection unit; The signal input terminal, the inductor L1, the woofer and the negative electrode of the signal input terminal are connected in series in sequence, the signal input terminal, the capacitor C2, the high-frequency protection unit, the tweeter and the negative electrode of the signal input terminal are connected in series in sequence, the capacitor C2 is also connected to the negative electrode of the signal input terminal through the inductor L2, and the PTC thermistor R2 is connected in parallel to both ends of the high-frequency protection unit; The high frequency protection unit is a bulb R1 or at least two bulbs connected in series.

2. The second-order frequency divider with high-frequency protection according to claim 1, characterized in that: The inductor L1 is 1.0 mH.

3. The second-order frequency divider with high-frequency protection according to claim 1, characterized in that: The inductor L2 is 0.5 mH.

4. The second-order frequency divider with high-frequency protection according to claim 1, characterized in that: The capacitor C1 is a 10uF capacitor C1.

5. The second-order frequency divider with high-frequency protection according to claim 1, characterized in that: The capacitor C2 is a 2.2uF capacitor C2.

6. The second-order frequency divider with high-frequency protection according to claim 1, characterized in that: The light bulb is a 50W / 24V light bulb.

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