Overvoltage alarm protection circuit

Abstract

The utility model, which relates to the safety protection field, discloses an overvoltage alarm protection circuit comprising a power supply module used for supplying power to a voltage detection module, a conduction control module, and an isolation feedback module; the voltage detection module is used for detecting the magnitude of the input voltage, outputting a control signal to the conduction control module when the input voltage exceeds a set threshold value, and triggering the isolation feedback module to work; the conduction control module is used for constructing a power supply loop of the power supply module and the load, and after the voltage detection module inputs the control signal, the power supply loop is disconnected; the beneficial effects of the utility model are that when the voltage detection module detects that the input voltage is over-voltage, the conduction control module is driven to disconnect a loop, and an over-voltage signal is fed back to the isolated and feedback phototriode through the isolation of the light emitting diode, thereby triggering an alarm prompt. And an over-voltage signal is output in an isolation manner to avoid direct contact between the voltage detection module and the isolation feedback module to cause influence.

Description

Technical Field

[0001] The utility model relates to the field of safety protection, in particular to an overpressure alarm protection circuit. Background Art

[0002] In electrical appliances, relevant overvoltage protection circuits and alarm circuits are often set up. After the overvoltage protection circuit starts the safety protection, the alarm circuit is often triggered.

[0003] Existing overpressure protection circuits often directly trigger alarm circuits. The two circuits are directly connected by a line and affect each other, which needs to be improved. Utility Model Content

[0004] The purpose of the utility model is to provide an overpressure alarm protection circuit to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] An overpressure alarm protection circuit, comprising:

[0007] A power supply module, used to supply power to a voltage detection module, a conduction control module, and an isolation feedback module;

[0008] The voltage detection module is used to detect the input voltage. When the input voltage exceeds the set threshold, it outputs a control signal to the conduction control module and triggers the isolation feedback module to work;

[0009] The conduction control module is used to construct a power supply circuit between the power supply module and the load. After the voltage detection module inputs a control signal, the power supply circuit is disconnected;

[0010] Isolation feedback module, used to trigger the alarm prompt module to work when working;

[0011] An alarm prompt module is used to alarm when the input voltage exceeds the set threshold during operation;

[0012] The power supply module is connected to the voltage detection module, the conduction control module, and the isolation feedback module. The voltage detection module is connected to the conduction control module and the isolation feedback module. The isolation feedback module is connected to the alarm prompt module.

[0013] As a further solution of the utility model: the voltage detection module includes a resistor R3, a resistor R4, a diode D1, a diode D2, and a resistor R5, one end of the resistor R3 is connected to the power supply module, the other end of the resistor R3 is connected to one end of the resistor R4, one end of the resistor R5, and the cathode of the diode D2, the anode of the diode D2 is grounded, the other end of the resistor R5 is connected to the conduction control module, the other end of the resistor R4 is connected to the anode of the diode D1, and the cathode of the diode D1 is grounded.

[0014] As a further solution of the utility model: the conduction control module includes a transistor V2, a transistor V3, and a resistor R6, the emitter of the transistor V3 is connected to the emitter of the transistor V2 and the power supply module, the collector of the transistor V3 is connected to one end of the load X, the other end of the load X is grounded, the base of the transistor V3 is connected to the collector of the transistor V2 and a point of the resistor R6, the other end of the resistor R6 is grounded, and the base of the transistor V2 is connected to the voltage detection module.

[0015] As a further solution of the utility model: the isolation feedback module includes a resistor R1, a transistor V1, and a capacitor C1, one end of the resistor R1 is connected to the power supply module, the other end of the resistor R1 is connected to the collector of the transistor V1, the emitter of the transistor V1 is connected to one end of the capacitor C1 and the alarm prompt module, the other end of the capacitor C1 is grounded, and the base of the transistor V1 is arranged in the light emitting illumination area of ​​the diode D1.

[0016] As a further solution of the utility model: the alarm prompt module includes a resistor R2, an inverter U1, and a speaker SPEAKER, one end of the resistor R2 is connected to the isolation feedback module, the other end of the resistor R2 is connected to the input end of the inverter U1, the output end of the inverter U1 is connected to one end of the speaker SPEAKER, and the other end of the speaker SPEAKER is grounded.

[0017] Compared with the prior art, the beneficial effect of the utility model is as follows: when the voltage detection module detects that the input voltage is overvoltage, the utility model drives the conduction control module to disconnect the loop, and at the same time feeds back the overvoltage signal to the isolated feedback phototransistor through light-emitting diode isolation, thereby triggering an alarm prompt, and isolating the output overvoltage signal to avoid direct contact between the voltage detection module and the isolated feedback module, which would cause an impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The schematic diagram of an overpressure alarm protection circuit is shown in FIG.

[0019] Figure 2 This is the circuit diagram of the power supply module.

[0020] Figure 3 It is a circuit diagram of a voltage detection module, a conduction control module, an isolation feedback module and an alarm prompt module. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0022] See also Figure 1 , an overpressure alarm protection circuit, comprising:

[0023] A power supply module, used to supply power to a voltage detection module, a conduction control module, and an isolation feedback module;

[0024] The voltage detection module is used to detect the input voltage. When the input voltage exceeds the set threshold, it outputs a control signal to the conduction control module and triggers the isolation feedback module to work;

[0025] The conduction control module is used to construct a power supply circuit between the power supply module and the load. After the voltage detection module inputs a control signal, the power supply circuit is disconnected;

[0026] Isolation feedback module, used to trigger the alarm prompt module to work when working;

[0027] An alarm prompt module is used to alarm when the input voltage exceeds the set threshold during operation;

[0028] The power supply module is connected to the voltage detection module, the conduction control module, and the isolation feedback module. The voltage detection module is connected to the conduction control module and the isolation feedback module. The isolation feedback module is connected to the alarm prompt module.

[0029] In the specific embodiment: please refer to Figure 2 The 220V input voltage is stepped down by transformer W, and then converted to AC by rectifier T. Finally, it is filtered by the filter circuit composed of capacitor C1, capacitor C2, and inductor L1, and becomes a stable DC power, which is output to the subsequent circuit.

[0030] In this example: See Figure 3 The voltage detection module includes a resistor R3, a resistor R4, a diode D1, a diode D2, and a resistor R5. One end of the resistor R3 is connected to the power supply module, the other end of the resistor R3 is connected to one end of the resistor R4, one end of the resistor R5, and the cathode of the diode D2, the anode of the diode D2 is grounded, the other end of the resistor R5 is connected to the conduction control module, the other end of the resistor R4 is connected to the anode of the diode D1, and the cathode of the diode D1 is grounded.

[0031] After the voltage is input, when the voltage is normal, the voltage regulator diode D2 will not be turned on. At this time, the resistor R5 outputs a high level for the conduction control module, and the light-emitting diode D1 lights up to indicate; when the voltage is overvoltage, the voltage regulator diode D2 is turned on, and the resistor R5 outputs a low level for the conduction control module, and the light-emitting diode D1 does not emit light.

[0032] In this example: See Figure 3 The conduction control module includes a transistor V2, a transistor V3, and a resistor R6. The emitter of the transistor V3 is connected to the emitter of the transistor V2 and the power supply module, the collector of the transistor V3 is connected to one end of the load X, and the other end of the load X is grounded. The base of the transistor V3 is connected to the collector of the transistor V2 and a point of the resistor R6, and the other end of the resistor R6 is grounded. The base of the transistor V2 is connected to the voltage detection module.

[0033] When a high level is input through the resistor R5, the transistor V2 is cut off, so that the base of the transistor V3 is at a low level, the transistor V3 is turned on, and the output voltage of the power supply module is output to the load X through the transistor V3;

[0034] When a low level is input through the resistor R5, the transistor V2 is turned on, so that the base of the transistor V3 is at a high level, the transistor V3 is turned off, and the load X stops working.

[0035] In this example: See Figure 3 The isolation feedback module includes a resistor R1, a transistor V1, and a capacitor C1. One end of the resistor R1 is connected to the power supply module, the other end of the resistor R1 is connected to the collector of the transistor V1, the emitter of the transistor V1 is connected to one end of the capacitor C1 and the alarm prompt module, the other end of the capacitor C1 is grounded, and the base of the transistor V1 is set in the light irradiation area of ​​the diode D1.

[0036] When the light-emitting diode D1 emits light, the phototransistor V1 is turned on, and the alarm prompt module outputs a high level; when the light-emitting diode D1 does not emit light, the phototransistor V1 is turned off, and the alarm prompt module outputs a low level.

[0037] In this example: See Figure 3 The alarm prompt module includes a resistor R2, an inverter U1, and a speaker SPEAKER. One end of the resistor R2 is connected to the isolation feedback module, the other end of the resistor R2 is connected to the input end of the inverter U1, the output end of the inverter U1 is connected to one end of the speaker SPEAKER, and the other end of the speaker SPEAKER is grounded.

[0038] When a high level is input, a low level is output through the inverter U1, and the speaker SPEAKER is not triggered to work. When a low level is input, a high level is output through the inverter U1, driving the speaker SPEAKER to work and beep to indicate voltage overvoltage.

[0039] The working principle of the utility model is as follows: the power supply module is used to supply power to the voltage detection module, the conduction control module and the isolation feedback module; the voltage detection module is used to detect the input voltage, and when the input voltage exceeds the set threshold, the control signal is output to the conduction control module, and the isolation feedback module is triggered to work; the conduction control module is used to construct a power supply circuit between the power supply module and the load, and the voltage detection module disconnects the power supply circuit after inputting the control signal; the isolation feedback module is used to trigger the alarm prompt module to work when working; the alarm prompt module is used to alarm when the input voltage exceeds the set threshold when working.

[0040] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0041] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An overpressure alarm protection circuit, characterized in that: The overpressure alarm protection circuit includes: A power supply module, used to supply power to a voltage detection module, a conduction control module, and an isolation feedback module; The voltage detection module is used to detect the input voltage. When the input voltage exceeds the set threshold, it outputs a control signal to the conduction control module and triggers the isolation feedback module to work; The conduction control module is used to construct a power supply circuit between the power supply module and the load. After the voltage detection module inputs a control signal, the power supply circuit is disconnected; Isolation feedback module, used to trigger the alarm prompt module to work when working; An alarm prompt module is used to alarm when the input voltage exceeds the set threshold during operation; The power supply module is connected to the voltage detection module, the conduction control module, and the isolation feedback module. The voltage detection module is connected to the conduction control module and the isolation feedback module. The isolation feedback module is connected to the alarm prompt module.

2. The overpressure alarm protection circuit according to claim 1 is characterized in that: The voltage detection module includes a resistor R3, a resistor R4, a diode D1, a diode D2, and a resistor R5. One end of the resistor R3 is connected to the power supply module, the other end of the resistor R3 is connected to one end of the resistor R4, one end of the resistor R5, and the cathode of the diode D2, the anode of the diode D2 is grounded, the other end of the resistor R5 is connected to the conduction control module, the other end of the resistor R4 is connected to the anode of the diode D1, and the cathode of the diode D1 is grounded.

3. The overpressure alarm protection circuit according to claim 1 is characterized in that: The conduction control module includes a transistor V2, a transistor V3, and a resistor R6. The emitter of the transistor V3 is connected to the emitter of the transistor V2 and the power supply module, the collector of the transistor V3 is connected to one end of the load X, and the other end of the load X is grounded. The base of the transistor V3 is connected to the collector of the transistor V2 and a point of the resistor R6, and the other end of the resistor R6 is grounded. The base of the transistor V2 is connected to the voltage detection module.

4. The overpressure alarm protection circuit according to claim 2 is characterized in that: The isolation feedback module includes a resistor R1, a transistor V1, and a capacitor C1. One end of the resistor R1 is connected to the power supply module, the other end of the resistor R1 is connected to the collector of the transistor V1, the emitter of the transistor V1 is connected to one end of the capacitor C1 and the alarm prompt module, the other end of the capacitor C1 is grounded, and the base of the transistor V1 is set in the light irradiation area of ​​the diode D1.

5. The overpressure alarm protection circuit according to claim 1 is characterized in that: The alarm prompt module includes a resistor R2, an inverter U1, and a speaker SPEAKER. One end of the resistor R2 is connected to the isolation feedback module, the other end of the resistor R2 is connected to the input end of the inverter U1, the output end of the inverter U1 is connected to one end of the speaker SPEAKER, and the other end of the speaker SPEAKER is grounded.

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