Voltage stabilizing circuit capable of preventing low-voltage false triggering

Abstract

The voltage stabilizing circuit comprises a resistor, a diode assembly, a triode assembly and a capacitor, the resistor is connected with the diode assembly, the input end of the resistor and the collector electrode of the triode assembly are both connected with the input end positive electrode VCC, and the capacitor is connected with the output end positive electrode VCC. The base electrode of the triode assembly is connected with the diode assembly, and the input end of the diode assembly is further connected with the input end negative electrode GND. According to the utility model, the circuit is not conducted under the condition that the input voltage is lower than a limit value; and when the input voltage is higher than a limit value, the circuit is conducted and the output voltage is stabilized, so that the functions of preventing conduction false triggering of a low-input-voltage circuit and conduction of a high-input-voltage circuit and stabilizing the output voltage are realized, and the problem that a common voltage stabilizing circuit is conducted under a low-voltage condition to trigger a buzzer to make a sound is solved.

Description

Technical Field

[0001] The utility model relates to the field of voltage-stabilizing circuits for driving buzzers to sound, in particular to a voltage-stabilizing circuit for preventing false triggering due to low voltage. Background Art

[0002] Buzzers, electronic components that provide audible notifications, are widely used in various electrical appliances, machinery, vehicles, and ships. The volume of the buzzer is directly affected by the driving voltage. Excessively high voltage can damage the buzzer or significantly reduce its lifespan. Therefore, a voltage regulator circuit is typically designed into the circuit to stabilize the buzzer's driving voltage.

[0003] Common voltage-stabilizing circuits can still conduct when the input voltage is low or below the regulated voltage. When leakage current flows through the circuit, the circuit conducts, triggering the buzzer to sound. To solve this problem, a Zener diode is usually connected in series at the front end of the voltage-stabilizing circuit. This forces all the current driving the buzzer to flow through the Zener diode. High-power, large-volume Zener diodes are required to meet the requirements. Utility Model Content

[0004] The purpose of the present invention is to provide a voltage stabilizing circuit that prevents false triggering at low voltage, so as to solve the problem in the above background technology that the commonly used voltage stabilizing circuit is turned on and triggers the buzzer to sound under low voltage conditions.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A voltage stabilizing circuit for preventing false low-voltage triggering comprises a resistor, a diode assembly, a transistor assembly and a capacitor. The resistor and the diode assembly are connected together, the input end of the resistor and the collector of the transistor assembly are both connected to the positive input terminal VCC, the base of the transistor assembly is connected to the diode assembly, and the emitter of the transistor assembly is connected to the capacitor and serves as the positive output terminal; the input end of the diode assembly is also connected to the negative input terminal GND, and the negative input terminal GND, the diode assembly and the capacitor are connected and share a common electrode with the negative output terminal.

[0007] Furthermore, the diode assembly includes a Zener diode ZD1 and a Zener diode ZD2, the transistor assembly is a transistor Q1, the base of the transistor Q1 is connected between the Zener diode ZD1 and the Zener diode ZD2; the resistor is a resistor R1, and the Zener diode ZD2 is connected in series between the resistor R1 and the Zener diode ZD1; the capacitor is a capacitor C1, the emitter of the transistor Q1 is connected to the capacitor C1, and when the input voltage of the positive electrode VDD of the input terminal is lower than the reverse breakdown voltage of the Zener diode ZD2, the Zener diode ZD2 is in the cut-off state and the circuit is not conductive.

[0008] Furthermore, the collector of the transistor Q1 is connected to the resistor R1 and the positive input terminal VCC.

[0009] Furthermore, the capacitor C1 and the voltage-stabilizing diode ZD1 are connected to the negative electrode of the input terminal and share a common electrode with the negative electrode of the output terminal.

[0010] The beneficial effects of the present invention are as follows: the present invention realizes that when the input voltage is lower than the limit value, the circuit is not turned on; when the input voltage is higher than the limit value, the circuit is turned on and the output voltage is stabilized, thereby realizing the function of preventing the circuit from being falsely triggered by turning on the circuit at a low input voltage and turning on the circuit and stabilizing the output voltage at a high input voltage. The voltage stabilizing diode controls the on-off state of the base of the transistor and stabilizes the base voltage of the transistor, thereby solving the problem that the commonly used voltage stabilizing circuit is turned on under low voltage conditions to trigger the buzzer to sound, and only needs to select a voltage stabilizing diode of general specifications to meet the requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a voltage stabilizing circuit diagram of the utility model. DETAILED DESCRIPTION

[0012] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0013] See also Figure 1 , which provides a technical solution for the utility model, a voltage stabilizing circuit for preventing false triggering of low voltage, including a resistor, a diode component, a transistor component and a capacitor, the resistor and the diode component are connected together, the input end of the resistor and the collector of the transistor component are both connected to the positive input terminal VCC, and the base of the transistor component is connected to the diode component, the emitter of the transistor component is connected to the capacitor and serves as the positive output terminal; the input end of the diode component is also connected to the negative input terminal GND, the negative input terminal GND, the diode component and the capacitor are connected and share a common pole with the negative output terminal.

[0014] In this embodiment, the diode assembly includes a Zener diode ZD1 and a Zener diode ZD2. The transistor assembly is a transistor Q1, and the base of the transistor Q1 is connected between the Zener diode ZD1 and the Zener diode ZD2. The resistor is a resistor R1, and the Zener diode ZD2 is connected in series between the resistor R1 and the Zener diode ZD1. The capacitor is a capacitor C1, and the emitter of the transistor Q1 is connected to the capacitor C1. When the input voltage of the positive electrode VDD of the input terminal is lower than the reverse breakdown voltage of the Zener diode ZD2, the Zener diode ZD2 is in the cut-off state and the circuit is non-conductive. The collector of the transistor Q1 is connected to the resistor R1 and the positive electrode VCC of the input terminal. The capacitor C1 and the Zener diode ZD1 are connected to the negative electrode of the input terminal and have a common electrode with the negative electrode of the output terminal.

[0015] In this embodiment, the resistor R1 is connected in series with the Zener diode ZD2 and the Zener diode ZD1; the collector of the transistor Q1 is connected to the resistor R1 and the positive electrode of the input terminal, the base of the transistor Q1 is connected between the Zener diode ZD2 and the Zener diode ZD1, the emitter of the transistor Q1 is connected to the capacitor C1 and serves as the positive electrode of the output terminal; the negative electrode of the input terminal is connected to the Zener diode ZD1 and the capacitor C1, and is in common with the negative electrode of the output terminal.

[0016] The voltage stabilizing circuit for preventing false low-voltage triggering operates as follows: when the input voltage of the positive electrode VCC at the input terminal is lower than the reverse breakdown voltage of the Zener diode ZD2, the Zener diode ZD2 is in the cut-off state and the circuit is not conducting; when the input voltage of the positive electrode VCC at the input terminal is higher than the reverse breakdown voltage of the Zener diode ZD2 but lower than the sum of the reverse breakdown voltages of the Zener diodes ZD1 and ZD2, current flows through the resistor R1 and the Zener diode ZD2, providing a starting voltage for the base of the transistor Q1 to turn on the transistor, and the circuit begins to conduct; when the input voltage of the positive electrode VCC at the input terminal exceeds the sum of the reverse breakdown voltages of the Zener diodes ZD1 and ZD2, current flows through the resistor R1 and the Zener diode ZD2, and the transistor Q1 is turned on. 1. Zener diode ZD2 provides a starting voltage for the base of transistor Q1, turning it on. Simultaneously, current flows through Zener diode ZD1, maintaining a constant base voltage for transistor Q1 and thereby stabilizing the circuit's output voltage. Another Zener diode, ZD2, is connected in series between resistor R1 and Zener diode ZD1. The reverse breakdown characteristics of the Zener diode are utilized to control the on / off state of the base of transistor Q1 and stabilize its base voltage. This prevents false triggering at low input voltages and allows for conduction and stable output voltage at high input voltages. The Zener diode controls the on / off state of the transistor base and stabilizes its base voltage, so a standard Zener diode can meet these requirements.

[0017] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0018] The above embodiments only express the preferred implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent for the utility model; it should be understood that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention; in the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two components or the interaction relationship between two components; among them, there are many ways of detachable installation, for example, it can be through the method of plug-in and snap-fit, for example, through the method of bolt connection, etc.

[0019] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A voltage stabilizing circuit for preventing false triggering due to low voltage, characterized in that: The invention comprises a resistor, a diode assembly, a transistor assembly and a capacitor. The resistor and the diode assembly are connected together. The input end of the resistor and the collector of the transistor assembly are both connected to the positive input terminal VCC, and the base of the transistor assembly is connected to the diode assembly. The emitter of the transistor assembly is connected to the capacitor and serves as the positive output terminal. The input end of the diode assembly is also connected to the negative input terminal GND. The negative input terminal GND, the diode assembly and the capacitor are connected and share a common electrode with the negative output terminal.

2. The voltage stabilizing circuit for preventing false low-voltage triggering according to claim 1, wherein: The diode assembly includes a Zener diode ZD1 and a Zener diode ZD2. The transistor assembly is a transistor Q1, the base of which is connected between the Zener diode ZD1 and the Zener diode ZD2. The resistor is a resistor R1, and the Zener diode ZD2 is connected in series between the resistor R1 and the Zener diode ZD1. The capacitor is a capacitor C1, and the emitter of the transistor Q1 is connected to the capacitor C1. When the input voltage of the positive electrode VDD of the input terminal is lower than the reverse breakdown voltage of the Zener diode ZD2, the Zener diode ZD2 is in the cut-off state and the circuit is not conductive.

3. The voltage stabilizing circuit for preventing false low-voltage triggering according to claim 2, wherein: The collector of the transistor Q1 is connected to the resistor R1 and the positive input terminal VCC.

4. The voltage stabilizing circuit for preventing false low-voltage triggering according to claim 2, wherein: The capacitor C1 and the voltage stabilizing diode ZD1 are connected to the negative electrode of the input terminal and share a common electrode with the negative electrode of the output terminal.

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