CN215898013U

CN215898013U - Low-power alarm circuit and hearing aid

Info

Publication number: CN215898013U
Application number: CN202121694706.4U
Authority: CN
Inventors: 余仕湖; 李伯阳; 陈财福; 李成玉
Original assignee: Xiamen Newsound Technology Co ltd
Current assignee: Xiamen Newsound Technology Co ltd
Priority date: 2021-07-23
Filing date: 2021-07-23
Publication date: 2022-02-22
Anticipated expiration: 2031-07-23

Abstract

The present invention relates to the field of circuits. The utility model discloses a low-power alarm circuit and a hearing aid, wherein the low-power alarm circuit comprises an MCU (microprogrammed control unit) processor, a first power circuit, a second power circuit, a first one-way conduction circuit, a second one-way conduction circuit and a DSP (digital signal processor) chip, the first power circuit is connected with a power supply end of the DSP chip through the first one-way conduction circuit to provide working voltage for the DSP chip, the second power circuit is connected with the power supply end of the DSP chip through the second one-way conduction circuit to provide low-power alarm voltage for the DSP chip, and the first power circuit and the second power circuit are controlled to be selected to work by the same control end of the MCU processor. The utility model can save MCU processor resources, reduce welding process procedures and reduce cost, can be better compatible with other DSP schemes, and greatly improves compatibility.

Description

Low-power alarm circuit and hearing aid

Technical Field

The utility model belongs to the field of circuits, and particularly relates to a low-power alarm circuit and a hearing aid.

Background

Hearing aids (Hearing aids), which are tools, devices, apparatuses, devices, and apparatuses that help Hearing-impaired people to improve their Hearing impairment and thus their ability to converse with others, transmit relatively weak sounds, after amplification, into the ear canal of a patient so that the patient can hear the relatively weak sounds. Hearing aids are classified into behind-the-ear hearing aids, in-the-ear hearing aids, box-type hearing aids, and the like according to their shapes.

The low-power alarm of the existing hearing aid is realized by sampling the low-power of a battery by an MCU (microprogrammed control unit) processor, and then sending an audio signal with fixed frequency such as 1KHZ to a DSP (digital signal processing) chip by the MCU processor to output the sound of the low-power alarm. In the implementation mode, two IO ports of the MCU processor are needed, one is to switch the audio input port to enable, the other is to output fixed frequency, the resources of the MCU processor are wasted, and if the panel is realized, because the DSP of the machine core is in a suspended flying line form, one flying line is added, the process is complicated, the labor cost is increased, and when other DSP chips are needed to be replaced, the two IO ports cannot be well compatible.

Disclosure of Invention

The utility model aims to provide a low-power alarm circuit and a hearing aid to solve the technical problems.

In order to achieve the purpose, the utility model adopts the technical scheme that: the utility model provides a low-power alarm circuit, including the MCU treater, first power supply circuit, the second power supply circuit, first one-way conduction circuit, second one-way conduction circuit and DSP chip, first power supply circuit provides operating voltage for the DSP chip through the power end that first one-way conduction circuit connects the DSP chip, second power supply circuit provides low-power alarm voltage for the DSP chip through the power end that second one-way conduction circuit connects the DSP chip, first power supply circuit and second power supply circuit are by the one and the same control end control alternative work of MCU treater.

Furthermore, the effective levels of the control ends of the first power supply circuit and the second power supply circuit are opposite, and the control ends of the first power supply circuit and the second power supply circuit are simultaneously connected with the control end of the MCU processor.

Furthermore, the effective levels of the control ends of the first power circuit and the second power circuit are the same, the first power circuit is connected with the control end of the MCU processor, and the control end of the second power circuit is connected with the control end of the MCU processor through a level reversing circuit.

Furthermore, the effective levels of the control ends of the first power circuit and the second power circuit are the same, the first power circuit is connected with the control end of the MCU processor through a level reversing circuit, and the control end of the second power circuit is connected with the control end of the MCU processor.

Further, the first power supply circuit is implemented by a DC-DC converter or an LDO linear regulator.

Further, the second power supply circuit is implemented by a DC-DC converter or an LDO linear regulator.

Further, the first unidirectional conducting circuit is realized by a diode D1 or a switch selection circuit.

Further, the second unidirectional conducting circuit is realized by a diode D2 or a switch selection circuit.

The utility model also provides a hearing aid which is provided with the low-power alarm circuit.

The utility model has the beneficial technical effects that:

the utility model can realize low-power alarm, only needs one IO port of the MCU processor, not only can save MCU processor resources, reduce welding process procedures and cost, but also can be better compatible with other DSP schemes, and the compatibility is greatly improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a circuit diagram of a first embodiment of the present invention;

FIG. 2 is a circuit diagram of a second embodiment of the present invention;

FIG. 3 is a circuit diagram of a level inversion circuit according to a second embodiment of the present invention;

fig. 4 is another circuit configuration diagram of the present invention.

Detailed Description

To further illustrate the various embodiments, the utility model provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the utility model and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The utility model will now be further described with reference to the accompanying drawings and detailed description.

Example one

As shown in fig. 1, a low-power alarm circuit includes an MCU processor (not shown in the figure), a first power circuit, a second power circuit, a first unidirectional conducting circuit, a second unidirectional conducting circuit and a DSP chip U3, wherein the first power circuit is connected to a power terminal DSP-VCC of the DSP chip U3 through the first unidirectional conducting circuit to provide a working voltage for the DSP chip U3, the second power circuit is connected to a power terminal DSP-VCC of the DSP chip U3 through the second unidirectional conducting circuit to provide a low-power alarm voltage for the DSP chip U3, and the first power circuit and the second power circuit are alternatively controlled by a same control terminal LDO-EN1(IO port) of the MCU processor.

In this embodiment, the first power circuit and the second power circuit are implemented by using LDO linear regulators U1 and U2, respectively, which have the advantages of low cost, low noise, small quiescent current, and the like.

In this embodiment, the active level of the control terminal EN of the LDO linear regulator U1 is opposite to the active level of the control terminal/EN of the LDO linear regulator U2, so that a level inversion circuit is not required, the circuit structure is simpler, and the cost is lower.

In this embodiment, the active level of the control terminal EN of the LDO linear regulator U1 is high level, the model of the LDO linear regulator U1 is SGM2036-1.3, and the active level of the control terminal/EN of the LDO linear regulator U2 is low level, but not limited thereto, in some embodiments, the active level of the control terminal EN of the LDO linear regulator U1 may be low level, and the active level of the control terminal/EN of the LDO linear regulator U2 may be high level.

The control end EN of the LDO linear regulator U1 and the control end/EN of the LDO linear regulator U2 are simultaneously connected with the control end LDO-EN1 of the MCU processor.

In this embodiment, the first unidirectional conducting circuit is implemented by the diode D1, and the second unidirectional conducting circuit is implemented by the diode D2, which has a simple circuit structure, is easy to implement, and has a low cost. Specifically, an output end OUT forward series diode D1 of the LDO linear regulator U1 is connected with a power supply end DSP-VCC of the DSP chip U3, and an output end OUT forward series diode D2 of the LDO linear regulator U2 is connected with a power supply end DSP-VCC of the DSP chip U3.

In this embodiment, the power supply terminal DSP-VCC of the DSP chip U3 is also grounded through the capacitor C1, further improving the power supply stability.

When the electric quantity of the battery is normal, the control end LDO-EN1 of the MCU processor outputs high level, the LDO linear voltage regulator U1 works to provide working voltage for the DSP chip U3, the DSP chip U3 works normally, and the LDO linear voltage regulator U2 does not work; when the battery power is low, the control end LDO-EN1 of the MCU processor outputs low level, the LDO linear voltage regulator U1 does not work, and the LDO linear voltage regulator U2 works to provide required low-power alarm voltage for the DSP chip U3, so that low-power alarm is realized.

Example two

As shown in fig. 2, the present embodiment is different from the first embodiment in that: the second power supply circuit of this embodiment is implemented by using the LDO linear regulator U2 ', the active level of the control end EN of the LDO linear regulator U2' is high level, the control end EN of the LDO linear regulator U2 'is connected to the control end LDO-EN1 of the MCU processor through the level reversing circuit 1, and by using this circuit structure, the selectivity of the LDO linear regulators U1 and U2' is larger.

Of course, in other embodiments, the level inversion circuit 1 may also be disposed between the control terminal EN of the LDO linear regulator U1 and the control terminal LDO-EN1 of the MCU processor, as shown in fig. 4.

In this embodiment, the LDO linear regulator U2' is model SGM2036-1.1, but is not limited thereto.

In this embodiment, the level inversion circuit 1 is implemented by using an NPN transistor Q1, and the circuit has a simple structure, is easy to implement, and has a low cost, and the specific circuit is shown in fig. 3, which is not detailed here, but in other embodiments, the level inversion circuit 1 may also be implemented by using other existing level inversion circuits, such as a level inversion circuit and an inverter formed by MOS transistors.

Of course, in some embodiments, the first power circuit may also be implemented by using an LDO linear regulator with a low active level at the control terminal.

The working principle of the present embodiment is similar to that of the first embodiment, and reference may be made to the first embodiment specifically, which is not described in detail.

While the utility model has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims

1. A low-battery alarm circuit, characterized by: the intelligent power supply comprises an MCU processor, a first power supply circuit, a second power supply circuit, a first one-way conduction circuit, a second one-way conduction circuit and a DSP chip, wherein the first power supply circuit provides working voltage for the DSP chip through a power supply end connected with the DSP chip through the first one-way conduction circuit, the second power supply circuit provides low-power alarm voltage for the DSP chip through a power supply end connected with the DSP chip through the second one-way conduction circuit, and the first power supply circuit and the second power supply circuit are controlled by the same control end of the MCU processor to be selected to work.

2. The low battery alarm circuit of claim 1, wherein: the effective levels of the control ends of the first power supply circuit and the second power supply circuit are opposite, and the control ends of the first power supply circuit and the second power supply circuit are simultaneously connected with the control end of the MCU processor.

3. The low battery alarm circuit of claim 1, wherein: the effective levels of the control ends of the first power circuit and the second power circuit are the same, the first power circuit is connected with the control end of the MCU processor, and the control end of the second power circuit is connected with the control end of the MCU processor through a level reversing circuit.

4. The low battery alarm circuit of claim 1, wherein: the effective levels of the control ends of the first power circuit and the second power circuit are the same, the first power circuit is connected with the control end of the MCU processor through a level reversing circuit, and the control end of the second power circuit is connected with the control end of the MCU processor.

5. The low battery alarm circuit of any of claims 1-4, wherein: the first power supply circuit is implemented by a DC-DC converter or an LDO linear regulator.

6. The low battery alarm circuit of any of claims 1-4, wherein: the second power supply circuit is implemented by a DC-DC converter or an LDO linear regulator.

7. The low battery alarm circuit of claim 1, wherein: the first unidirectional conducting circuit is realized by a diode D1 or a switch selection circuit.

8. The low battery alarm circuit of claim 1, wherein: the second unidirectional conducting circuit is realized by a diode D2 or a switch selection circuit.

9. A hearing aid, characterized by: a low battery alarm circuit as claimed in any one of claims 1 to 8.