Status detection of alarm sounding parts

1. A state detection device of an alarm sounding component, comprising:

a detection circuit for applying a detection signal to control detection of an equivalent load capacitor of the alarm sounding component that is capacitive;

a sampling circuit for sampling feedback information of the equivalent load capacitor of the alarm sounding component when a signal of the detection signal is applied to the alarm sounding component to obtain a sampled signal; and

a controller for generating the detection signal and analyzing and processing the sampled signal to obtain state information which can reflect a fault condition of the alarm sounding component;

wherein the detection signal is a pulse voltage signal;

wherein the detection circuit comprises:

a triode, a base of the triode is biased with the pulse voltage signal to control on and off of the triode, and a collector of the triode is electrically connected with a first end of the alarm sounding component, and an emitter of the triode is grounded; and

a low-voltage power supply for outputting direct current voltage to a second end of the alarm sounding component.

2. The state detection device of claim 1 , wherein the sampling circuit comprises:

an inductor, two ends of the inductor are electrically connected with the first end and the second end of the alarm sounding component respectively so as to be in parallel connection with the equivalent load capacitor; and

a first sampling resistor and a second sampling resistor disposed in series with the inductor;

wherein the first sampling resistor is disposed between the inductor and the low-voltage power supply, and the second sampling resistor is disposed between the inductor and the controller.

3. A state detection device of an alarm sounding component, comprising:

a detection circuit for applying a detection signal to control detection of an equivalent load capacitor of the alarm sounding component that is capacitive;

a sampling circuit for sampling feedback information of the equivalent load capacitor of the alarm sounding component when a signal of the detection signal is applied to the alarm sounding component to obtain a sampled signal; and

a controller for generating the detection signal and analyzing and processing the sampled signal to obtain state information which can reflect a fault condition of the alarm sounding component;

wherein the controller comprises:

a sampled signal processing module for analyzing and processing the sampled signal to obtain state information which can reflect the fault condition of the alarm sounding component;

a detection signal generation module for generating the detection signal; and

a state information output module for controlling the output of the state information;

wherein the detection signal is a pulse voltage signal; the sampled signal processing module is further used for calculating a voltage mean value of the sampled signal during a time period correspondingly including an occurrence of a falling edge of the pulse voltage signal, and performing analog-to-digital conversion on the voltage mean value to obtain first digital state information.

4. The state detection device of claim 3 , wherein the state information output module is further used to amplify and convert the first digital state information into second digital state information section by section.

5. The state detection device of claim 3 , wherein the state information comprises:

normal state information reflecting that the alarm sounding component works normally,

open circuit state information reflecting that the alarm sounding component is open circuited, and

short circuit state information reflecting that the alarm sounding component is short circuited.

6. The state detection device of claim 3 ,

wherein the sampled signal sampled by the sampling circuit corresponds to a voltage measured during an edge of the pulse voltage signal.

7. The state detection device of claim 3 , wherein the alarm sounding component is used for a field alarm terminal of a fire alarm system.

8. The state detection device according to claim 3 , wherein the alarm sounding component is a piezoelectric buzzer.

9. The state detection device of claim 3 , wherein a frequency of the pulse voltage signal is in a range of an order of 10 KHz to 1 MHz.

10. A field alarm terminal comprising an alarm sounding component for raising an audio alarm signal, further comprising a state detection device of claim 3 .

11. A fire alarm system, comprising:

one or more field alarm terminals of claim 10 ; and

a control module coupled with the field alarm terminal and receiving state information from the field alarm terminal.

12. The fire alarm system of claim 10 , wherein the control module comprises: a fault prompt unit for prompting a fault condition of respective field alarm terminal based on the state information.

13. The fire alarm system of claim 10 , wherein the control module comprises: state confirmation module for confirming the fault condition of the alarm sounding component of the respective field alarm terminal based on the state information.