Intelligent circuit breaker output power failure detection circuit and electronic equipment

Abstract

The utility model discloses an intelligent circuit breaker output power-off detection circuit and electronic equipment. The circuit comprises a rectification unit which is used for connecting an output side of a circuit breaker so as to rectify an input voltage when any phase of the output side of the circuit breaker is electrified; the filtering and voltage reducing unit is connected with the rectifying unit and is used for filtering and reducing the rectified input voltage; the isolation unit is connected with the filtering and voltage reduction unit; and the detection signal generation unit is connected with the isolation unit and is used for being matched with the isolation unit so as to output a set level signal when any phase of the output side of the circuit breaker is electrified. The utility model has the advantages of simple circuit structure, low cost, high reliability and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent circuit breakers, in particular to an intelligent circuit breaker output power failure detection circuit and electronic equipment. Background Art

[0002] When it is necessary to maintain the downstream lines of the intelligent circuit breaker, the circuit breaker must be controlled to open first. Under normal circumstances, there is no electricity on the output side of the circuit breaker. However, when the circuit breaker contacts are burned or adhered, the contacts may not be disconnected normally, causing the downstream lines to be energized. The circuit breaker itself does not have the function of detecting whether the output side is energized after opening. Therefore, a dedicated detection circuit is required to detect whether there is voltage on the output side after the circuit breaker is opened to ensure safety.

[0003] Existing detection circuits mainly include isolated detection circuits, which usually use isolation transformers and linear optocouplers combined with ADC sampling technology to sample analog signals. Although they can accurately collect voltage signals, they have defects such as high implementation costs and complex implementation technologies. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an intelligent circuit breaker output power failure detection circuit and electronic equipment.

[0005] The technical solution adopted by the utility model to solve the technical problem is: constructing an intelligent circuit breaker output power failure detection circuit, including:

[0006] A rectifier unit for connecting to the output side of the circuit breaker to rectify the input voltage when any phase of the output side of the circuit breaker is energized;

[0007] A filtering and voltage reduction unit connected to the rectifying unit for filtering and reducing the voltage of the rectified input voltage;

[0008] an isolation unit connected to the filtering and voltage reduction unit; and

[0009] A detection signal generating unit is connected to the isolation unit and is used to cooperate with the isolation unit to output a set level signal when any phase on the output side of the circuit breaker is energized.

[0010] Preferably, the rectifier unit includes multiple sub-rectifier units; the first end of each sub-rectifier unit is used to connect one-to-one to each output end of the output side of the circuit breaker, the second end of each sub-rectifier unit is simultaneously connected to the first end of the filter and step-down unit, and the third end of each sub-rectifier unit is simultaneously connected to the second end of the filter and step-down unit.

[0011] Preferably, each of the sub-rectifier units includes a first diode D1 and a second diode D2;

[0012] The anode of the first diode D1 and the cathode of the second diode D2 are connected to serve as the first end of the sub-rectifier unit, the cathode of the first diode D1 serves as the second end of the sub-rectifier unit and is connected to the first end of the filtering and step-down unit, and the anode of the second diode D2 serves as the third end of the sub-rectifier unit and is connected to the second end of the filtering and step-down unit.

[0013] Preferably, the number of the sub-rectifier units is 4.

[0014] Preferably, the filtering and step-down unit comprises a first filtering unit for filtering the rectified input voltage and a step-down unit for stepping down the rectified input voltage;

[0015] The first end of the first filter unit and the first end of the step-down unit are connected to the rectifier unit as the first end of the filter and step-down unit, the second end of the first filter unit is connected to the rectifier unit and the second input end of the isolation unit as the second end of the filter and step-down unit, and the second end of the step-down unit is connected to the first input end of the isolation unit.

[0016] Preferably, the first filtering unit includes a first capacitor C1, and the voltage reduction unit includes a first resistor R1.

[0017] Preferably, the isolation unit includes an optocoupler U1; the anode of the optocoupler U1 serves as the first input end of the isolation unit and is connected to the second end of the step-down unit, the cathode of the optocoupler U1 serves as the second input end of the isolation unit and is connected to the second end of the first filtering unit, the collector of the optocoupler U1 is connected to the detection signal generating unit, and the emitter of the optocoupler U1 is grounded.

[0018] Preferably, the detection signal generating unit comprises a second resistor R2; a first end of the second resistor R2 is connected to a first DC voltage, and a second end of the second resistor R2 serves as a setting level signal output end and is connected to a collector of the optocoupler U1.

[0019] Preferably, the intelligent circuit breaker output power failure detection circuit further comprises a second filtering unit connected to the detection signal generating unit for filtering the set level signal;

[0020] The second filtering unit includes a second capacitor C2, and the second end of the second resistor R2 is connected to the ground via the second capacitor C2.

[0021] The utility model also constructs an electronic device, which comprises the above-mentioned intelligent circuit breaker output power failure detection circuit.

[0022] The utility model has the following beneficial effects: providing an intelligent circuit breaker output power-off detection circuit; when any phase on the output side of the circuit breaker is energized, the input voltage is rectified by a rectifier unit, and then the rectified input voltage is filtered and stepped down by a filter and step-down unit, and then an isolation unit is used to cooperate with a detection signal generation unit to output a set level signal when any phase on the output side of the circuit breaker is energized, and the utility model also has the advantages of simple circuit structure, low cost and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0024] Figure 1 It is a circuit principle diagram of an output power failure detection circuit of an intelligent circuit breaker in some embodiments of the utility model. DETAILED DESCRIPTION

[0025] In order to have a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation methods of the present utility model are now described in detail with reference to the accompanying drawings.

[0026] like Figure 1 As shown in the figure, it is a circuit schematic diagram of the intelligent circuit breaker output power failure detection circuit in some embodiments provided by the utility model. The intelligent circuit breaker output power failure detection circuit can output a set level signal that can serve as a prompt when detecting that any phase line on the output side of the intelligent circuit breaker after the switch is opened is energized, thereby effectively preventing the staff from performing verification when the rear-stage line of the intelligent circuit breaker is energized. Figure 1 As shown, the circuit includes:

[0027] A rectifier unit 1 for connecting to the output side of the circuit breaker to rectify the input voltage when any phase of the output side of the circuit breaker is energized;

[0028] A filtering and voltage reduction unit 2 connected to the rectifying unit 1 for filtering and reducing the voltage of the rectified input voltage;

[0029] an isolation unit 3 connected to the filtering and voltage reduction unit 2; and

[0030] A detection signal generating unit 4 is connected to the isolation unit 3 and is used to cooperate with the isolation unit 3 to output a set level signal when any phase on the output side of the circuit breaker is energized.

[0031] In this embodiment, when any phase on the output side of the circuit breaker is energized, the rectifier unit 1 will rectify the input voltage output by the energized phase line; then the filtering and step-down unit 2 filters the rectified input voltage to improve the stability of the rectified input voltage, and the filtering and step-down unit 2 also steps down the rectified input voltage to avoid damage to the isolation unit 3 at the subsequent stage due to overcurrent; then the isolation unit 3 cooperates with the detection signal generating unit 4 to output a set level signal when any phase on the output side of the circuit breaker is energized. The set level signal can be transmitted to the alarm circuit in the intelligent circuit breaker, thereby informing the staff that the output side of the circuit breaker is in a energized state, thereby reducing the risk of electric shock. It can be understood that the utility model has the advantages of simple circuit structure, low cost and high reliability.

[0032] In some embodiments, Figure 1 As shown, the rectifier unit 1 includes multiple sub-rectifier units 11; the first end of each sub-rectifier unit 11 is used to connect to each output end of the output side of the circuit breaker one-to-one, the second end of each sub-rectifier unit 11 is simultaneously connected to the first end of the filter and step-down unit 2, and the third end of each sub-rectifier unit 11 is simultaneously connected to the second end of the filter and step-down unit 2. Optionally, the number of sub-rectifier units 11 is 4. It can be understood that the number of sub-rectifier units 11 is 4, then the utility model can be applied to circuit breakers of four-wire system and below (such as three-phase four-wire circuit breakers, three-phase circuit breakers and two-phase circuit breakers). Specifically, for three-phase four-wire circuit breakers, the first ends of the four sub-rectifier units 11 can be connected one-to-one to the three-phase line output ends and the neutral point output end of the three-phase four-wire circuit breaker, respectively, so that it is possible to detect whether the output side of the three-phase four-wire circuit breaker is energized; for three-phase circuit breakers, as long as three of the sub-rectifier units 11 are connected one-to-one to the three phase line output ends of the output measurement, the detection work can be carried out.

[0033] Furthermore, if Figure 1 As shown, each sub-rectifier unit 11 may include a first diode D1 and a second diode D2. The anode of the first diode D1 and the cathode of the second diode D2 are connected as the first end of the sub-rectifier unit 11, the cathode of the first diode D1 is connected to the first end of the filter and step-down unit 2 as the second end of the sub-rectifier unit 11, and the anode of the second diode D2 is connected to the second end of the filter and step-down unit 2 as the third end of the sub-rectifier unit 11.

[0034] In some embodiments, Figure 1As shown, the filtering and step-down unit 2 includes a first filtering unit 21 for filtering the rectified input voltage and a step-down unit 22 for stepping down the rectified input voltage. The first end of the first filtering unit 21 and the first end of the step-down unit 22 are connected as the first end of the filtering and step-down unit 2 to connect the rectifier unit 1, the second end of the first filtering unit 21 is connected as the second end of the filtering and step-down unit 2 to connect the rectifier unit 1 and the second input end of the isolation unit 3, and the second end of the step-down unit 22 is connected to the first input end of the isolation unit 3.

[0035] Furthermore, if Figure 1 As shown, the first filtering unit 21 may include a first capacitor C1. In this embodiment, the first end and the second end of the first capacitor C1 correspond to the first end and the second end of the first filtering unit 21. Alternatively, the first filtering unit 21 may also be composed of a plurality of capacitors in series or in parallel according to actual application requirements, thereby improving the filtering effect.

[0036] Furthermore, if Figure 1 As shown, the voltage reduction unit 22 may include a first resistor R1. In this embodiment, the first end and the second end of the first resistor R1 correspond to the first end and the second end of the voltage reduction unit 22. Alternatively, the voltage reduction unit 22 may also be composed of a plurality of resistors in series or in parallel according to actual application requirements to improve the voltage resistance performance of the voltage reduction unit 22 and the current threshold value that can be passed.

[0037] In some embodiments, Figure 1 As shown, the isolation unit 3 includes an optocoupler U1. The anode of the optocoupler U1 is connected to the second end of the step-down unit 22 as the first input end of the isolation unit 3, the cathode of the optocoupler U1 is connected to the second end of the first filtering unit 21 as the second input end of the isolation unit 3, the collector of the optocoupler U1 is connected to the detection signal generating unit 4, and the emitter of the optocoupler U1 is grounded. In this embodiment, the step-down unit 22 can limit the current flowing through the anode and cathode of the optocoupler U1, thereby effectively preventing the optocoupler U1 from being damaged due to overcurrent.

[0038] In some embodiments, Figure 1 As shown, the detection signal generating unit 4 includes a second resistor R2. The first end of the second resistor R2 is connected to the first DC voltage, and the second end of the second resistor R2 is used as the setting level signal output end and connected to the collector of the optocoupler U1. In this embodiment, the first DC voltage can be provided by a power supply circuit related to the power supply of its control circuit included in the intelligent circuit breaker, so that the second resistor R2 plays a pull-up role.

[0039] Furthermore, in some examples, such as Figure 1As shown, the detection signal generating unit 4 also includes a second filtering unit 5 connected to the second end of the second resistor R2 for filtering the set level signal. The second filtering unit 5 may include a second capacitor C2, and the second end of the second resistor R2 is connected to the ground via the second capacitor C2. In this embodiment, the second filtering unit 5 filters the set level signal, and can filter out abnormal jitter noise caused by interference in the set level signal, thereby preventing the set level signal from misconveying erroneous information.

[0040] See also Figure 1 The working principle of the intelligent circuit breaker output power-off detection circuit is as follows: Assuming that the intelligent circuit breaker is a three-phase four-wire circuit breaker, after each sub-rectifier unit 11 is connected one-to-one with the four output terminals of the output side of the intelligent circuit breaker, if the output side is not energized, the optocoupler U1 is turned off due to the lack of power supply. Under the pull-up action of the second resistor R2, the second end of the second resistor R2 is set to a high level. At this time, the low-level signal can indicate that the output side of the circuit breaker is not energized; if any phase line on the output side is energized, the relevant sub-rectifier unit 11 will rectify the input voltage, and after being stepped down by the step-down unit 22, it will be input to the optocoupler U1, thereby making the optocoupler U1 energized and turned on. The optocoupler U1 will pull down the voltage of the second end of the second resistor R2 to a low level, and the setting level signal is switched to a low level. At this time, the high-level signal (i.e., the setting level signal) can indicate that the output side of the circuit breaker is energized.

[0041] The utility model also provides an electronic device, comprising the intelligent circuit breaker output power failure detection circuit provided by the embodiment of the utility model.

[0042] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should belong to the scope covered by the claims of the utility model.

Claims

1. An intelligent circuit breaker output power failure detection circuit, characterized in that: include: A rectifier unit (1) for connecting to the output side of a circuit breaker to rectify an input voltage when any phase of the output side of the circuit breaker is energized; A filtering and voltage reduction unit (2) connected to the rectifying unit (1) and used for filtering and reducing the voltage of the rectified input voltage; an isolation unit (3) connected to the filtering and voltage reduction unit (2); and A detection signal generating unit (4) is connected to the isolation unit (3) and is used to cooperate with the isolation unit (3) to output a set level signal when any phase on the output side of the circuit breaker is energized.

2. The intelligent circuit breaker output power failure detection circuit according to claim 1, characterized in that: The rectifier unit (1) comprises a plurality of sub-rectifier units (11); the first end of each of the sub-rectifier units (11) is used to connect one-to-one to each output end of the output side of the circuit breaker, the second end of each of the sub-rectifier units (11) is simultaneously connected to the first end of the filtering and step-down unit (2), and the third end of each of the sub-rectifier units (11) is simultaneously connected to the second end of the filtering and step-down unit (2).

3. The intelligent circuit breaker output power failure detection circuit according to claim 2, characterized in that: Each of the sub-rectifier units (11) comprises a first diode D1 and a second diode D2; The anode of the first diode D1 and the cathode of the second diode D2 are connected to serve as the first end of the sub-rectifier unit (11); the cathode of the first diode D1 serves as the second end of the sub-rectifier unit (11) and is connected to the first end of the filtering and step-down unit (2); and the anode of the second diode D2 serves as the third end of the sub-rectifier unit (11) and is connected to the second end of the filtering and step-down unit (2).

4. The intelligent circuit breaker output power failure detection circuit according to claim 2, characterized in that: The number of the sub-rectifier units (11) is 4.

5. The intelligent circuit breaker output power failure detection circuit according to claim 1, characterized in that: The filtering and voltage reduction unit (2) comprises a first filtering unit (21) for filtering the rectified input voltage and a voltage reduction unit (22) for reducing the voltage of the rectified input voltage; The first end of the first filtering unit (21) and the first end of the voltage reduction unit (22) are connected to serve as the first end of the filtering and voltage reduction unit (2) and connected to the rectifying unit (1); the second end of the first filtering unit (21) serves as the second end of the filtering and voltage reduction unit (2) and is connected to the rectifying unit (1) and the second input end of the isolation unit (3); and the second end of the voltage reduction unit (22) is connected to the first input end of the isolation unit (3).

6. The intelligent circuit breaker output power failure detection circuit according to claim 5, characterized in that: The first filtering unit (21) comprises a first capacitor C1, and the voltage reduction unit (22) comprises a first resistor R1.

7. The intelligent circuit breaker output power failure detection circuit according to claim 5, characterized in that: The isolation unit (3) comprises an optical coupler U1; an anode of the optical coupler U1 is connected to the second end of the step-down unit (22) as a first input end of the isolation unit (3); a cathode of the optical coupler U1 is connected to the second end of the first filtering unit (21) as a second input end of the isolation unit (3); a collector of the optical coupler U1 is connected to the detection signal generating unit (4); and an emitter of the optical coupler U1 is grounded.

8. The intelligent circuit breaker output power failure detection circuit according to claim 7, characterized in that: The detection signal generating unit (4) comprises a second resistor R2; a first end of the second resistor R2 is connected to a first DC voltage, and a second end of the second resistor R2 serves as a setting level signal output end and is connected to the collector of the optical coupler U1.

9. The intelligent circuit breaker output power failure detection circuit according to claim 8, characterized in that: It also includes a second filtering unit (5) connected to the detection signal generating unit (4) and used for filtering the set level signal; The second filtering unit (5) comprises a second capacitor C2, and the second end of the second resistor R2 is connected to the ground via the second capacitor C2.

10. An electronic device, characterized in that: It comprises the intelligent circuit breaker output power failure detection circuit as claimed in any one of claims 1 to 9.

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