AU2020104092A4

AU2020104092A4 - Key combination reset circuit

Info

Publication number: AU2020104092A4
Application number: AU2020104092A
Authority: AU
Inventors: Ding HE; Zhi Liu; Xiangao XIAO; Hailong Zhou
Original assignee: Shenzhen Thousandshores Technology Co Ltd
Current assignee: Shenzhen Thousandshores Technology Co Ltd
Priority date: 2020-11-26
Filing date: 2020-12-15
Publication date: 2021-02-25
Anticipated expiration: 2028-12-15
Also published as: CN214125261U

Abstract

The present disclosure discloses a key combination reset circuit, disposed in an electronic device, and electronically connected to a control chip of the electronic device, the electronic device being provided with at least two keys, where the key combination reset circuit includes a first signal input end, a second signal input end, a first triode, a second triode, and a reset signal output end, the first signal input end and the second signal input end are electronically connected to the two keys respectively, the second signal input end is connected to a base of the second triode through a third resistance, an emitter of the second triode is connected to ground, a collector of the second triode is connected to an emitter of the first triode, a base of the first triode is connected to the first signal input end through a second resistance, a collector of the first triode is connected to the reset signal output end through a first resistance, and the reset signal output end is electronically connected to a reset input end of the control chip. By pressing the existing keys simultaneously, the key combination reset circuit in the present disclosure implements reset through two connected triodes without an additional reset key. 1 VOL+ R4 VOL R5 RESETOUT cl R1 IN1C Q1 R2 B:f Q E IN2C Q2 R3 B FIG. 2

Description

VOL+

R4 VOL

R5

RESETOUT cl R1

IN1C Q1 B:f Q R2 E

IN2C Q2 R3 B

FIG. 2

KEY COMBINATION RESET CIRCUIT

Field of Technology

The present disclosure relates to the field of electronic technologies, and in particular, to a key combination reset circuit.

Background Technology

Uniform features of current electronic devices such as loudspeakers are that: there are built-in batteries with different capacities and a plurality of operation keys, and an additional reset key and reset circuit are required for providing a reset signal for the reset and reboot of most electronic devices, in order to avoid a phenomenon that the device crashes and cannot be rebooted during running. The internal circuit thereof is complex, and the electronic device needs to be provided with a hole for configuration of a reset key.

In view of this, it is necessary to provide a key combination reset circuit to provide a reset signal for hardware reset by using the existing key combination.

Summary

The present disclosure resolves the technical problem by providing a key combination reset circuit to provide a reset signal for hardware reset by using the existing key combination.

To resolve the foregoing problem, the following technical solutions are adopted in the present disclosure: a key combination reset circuit, disposed in an electronic device, and electronically connected to a control chip of the electronic device, the electronic device being provided with at least two keys, where the key combination reset circuit includes a first signal input end, a second signal input end, a first triode, a second triode, and a reset signal output end, the first signal input end and the second signal input end are electronically connected to the two keys respectively, the second signal input end is connected to a base of the second triode through a third resistance, an emitter of the second triode is connected to ground, a collector of the second triode is connected to an emitter of the first triode, a base of the first triode is connected to the first signal input end through a second resistance, a collector of the first triode is connected to the reset signal output end through a first resistance, and the reset signal output end is electronically connected to a reset input end of the control chip.

A further technical solution is as follows: there is a grounded capacitance connected between the reset signal output end and thefirst resistance.

A further technical solution is as follows: the two keys of the electronic device are respectively a volume down key and a volume up key, and the first signal input end and the second signal input end are electronically connected to the volume down key and the volume up key respectively.

A further technical solution is as follows: the volume down key and the volume up key are electronically connected to a power supply of the electronic device separately, the volume down key is connected to the first signal input end through a fifth resistance, and the volume up key is connected to the second signal input end through a fourth resistance.

The beneficial technical effects of the present disclosure are that, in the key combination reset circuit of the present disclosure, the first signal input end and the second signal input end are disposed to be electronically connected to the existing keys on the electronic device respectively, and the reset signal output end is electronically connected to the reset input end of the control chip. The two connected triodes are utilized. By pressing the keys simultaneously to input a signal for controlling the two triodes to be switched on, a reset signal is triggered and transmitted to the control chip to perform a reset control. Hardware reset is implemented by using the existing key combination to provide the reset signal, no additional reset key is required, no additional hole is required for the electronic device, and no complex reset circuit design is required. Therefore, the cost is lowered, the operation is easy, and the practicality is strong.

Brief Description of the Drawings

FIG. 1 is a schematic circuit diagram of a key combination reset circuit according to the present disclosure; and

FIG. 2 is a schematic circuit diagram of a key combination reset circuit according to a specific embodiment of the present disclosure.

Detailed Description

In order that a person skilled in the art more clearly understands the objectives, technical solutions, and advantages of the present disclosure, the present disclosure is further described with reference to the accompanying drawings and the embodiments.

Referring to FIG. 1, a key combination reset circuit of the present disclosure is disposed in an electronic device, and electronically connected to a control chip of the electronic device, the electronic device being provided with at least two keys. The key combination reset circuit includes a first signal input end IN1, a second signal input end IN2, a first triode QI, a second triode Q2, and a reset signal output end RESETOUT. The first signal input end INI and the second signal input end IN2 are electronically connected to the two keys respectively. The second signal input end IN2 is connected to a base B of the second triode Q2 through a third resistance R3, an emitter E of the second triode Q2 is connected to ground. A collector C of the second triode Q2 is connected to an emitter E of the first triode Q1. A base B of the first triode QIis connected to the first signal input end IN Through a second resistance R2. A collector C of the first triode Q Iis connected to the reset signal output end RESETOUT through a first resistance RI. The reset signal output end RESETOUT is electronically connected to a reset input end of the control chip.

Both the first triode QI and the second triode Q2 are NPN-typed transistors. When at work and a user presses a single key, only a signal is inputted to a single signal input end, the first triode QI and the second triode Q2 cannot be switched on at the same time, a complete circuit cannot be formed in the key combination reset circuit, and there is no signal outputted from the reset signal output end RESETOUT. When the user presses in combination the keys respectively corresponding to the first signal input end INI and the second signal input end IN2, there are signals inputted to the first signal input end IN1 and the second signal input end IN2 simultaneously, the first triode Q Iand the second triode Q2 are switched on at the same time, a complete circuit is formed in the key combination reset circuit, the reset signal output end RESETOUT outputs a signal and transmits the signal to the reset input end of the control chip, to implement a reset control.

In the key combination reset circuit, the first signal input end IN Iand the second signal input end IN2 are disposed to be electronically connected to the existing two keys on the electronic device respectively, and the reset signal output end RESETOUT is electronically connected to the reset input end of the control chip. The connected first triode Q Iand second triode Q2 are utilized. By pressing the keys simultaneously to input signals synchronously and in combination, the first triode QI and second triode Q2 are controlled to be switched on, the reset signal output end RESETOUT may output a signal, and a reset signal is triggered and transmitted to the control chip to perform a reset control. Hardware reset is implemented by using the existing key combination application to provide the reset signal, no additional reset key is required, no additional hole is required for the electronic device, and no complex reset circuit design is required. Therefore, the cost is lowered, the operation is easy, and the practicality is strong.

Specifically, there is a grounded capacitance C1 connected in parallel between the reset signal output end RESETOUT and the first resistance RI to implement filtering.

Referring to FIG. 2, in this embodiment, the two keys of the electronic device are respectively a volume down key VOL- and a volume up key VOL+, and the first signal input end IN1 and the second signal input end IN2 are electronically connected to the volume down key VOL- and the volume up key VOL+ respectively.

Specifically, the volume down key VOL- and the volume up key VOL+ are electronically connected to a power supply VCC of the electronic device separately. The volume down key VOL- is connected to the first signal input end IN1 through a fifth resistance R5, and the volume up key VOL+ is connected to the second signal input end IN2 through a fourth resistance R4. Therefore, by pressing the volume down key VOL- and the volume up key VOL+, signals are inputted to the first signal input end INI and the second signal input end IN2 respectively.

In conclusion, in the key combination reset circuit of the present disclosure, the first signal input end and the second signal input end are disposed to be electronically connected to the existing keys on the electronic device respectively, and the reset signal output end is electronically connected to the reset input end of the control chip. The two connected triodes are utilized. By pressing the keys simultaneously to input a signal for controlling the two triodes to be switched on, a reset signal is triggered and transmitted to the control chip to perform a reset control. Hardware reset is implemented by using the existing key combination to provide the reset signal, no additional reset key is required, no additional hole is required for the electronic device, and no complex reset circuit design is required. Therefore, the cost is lowered, the operation is easy, and the practicality is strong.

The foregoing descriptions are merely exemplary embodiments of the present disclosure, and are not intended to limit the present disclosure in any form. A person skilled in the art may make various equivalent modifications and improvements based on the foregoing embodiments. Any equivalent alteration or decoration within the scope of the claims shall fall within the protection scope of the present disclosure.

Claims

1. A key combination reset circuit, disposed in an electronic device, and electronically connected to a control chip of the electronic device, the electronic device being provided with at least two keys, wherein the key combination reset circuit comprises a first signal input end, a second signal input end, a first triode, a second triode, and a reset signal output end, the first signal input end and the second signal input end are electronically connected to the two keys respectively, the second signal input end is connected to a base of the second triode through a third resistance, an emitter of the second triode is connected to ground, a collector of the second triode is connected to an emitter of the first triode, a base of the first triode is connected to the first signal input end through a second resistance, a collector of the first triode is connected to the reset signal output end through a first resistance, and the reset signal output end is electronically connected to a reset input end of the control chip.

2. The key combination reset circuit according to claim 1, wherein there is a grounded capacitance connected in parallel between the reset signal output end and the first resistance.

3. The key combination reset circuit according to claim 1, wherein the two keys of the electronic device are respectively a volume down key and a volume up key, and the first signal input end and the second signal input end are electronically connected to the volume down key and the volume up key respectively.

4. The key combination reset circuit according to claim 3, wherein the volume down key and the volume up key are electronically connected to a power supply of the electronic device separately, the volume down key is connected to the first signal input end through a fifth resistance, and the volume up key is connected to the second signal input end through a fourth resistance.

RESET_OUT R1 2020104092

C1

C IN1 Q1 R2 B E

C IN2 Q2 R3 B E

FIG. 1

VOL+ VCC IN2

R4 VOL- IN1 2020104092

R5

RESET_OUT R1 C1

C IN1 Q1 R2 B E

C IN2 Q2 R3 B E

FIG. 2