CN211826372U - Residual current self-checking circuit for miniature circuit breaker - Google Patents
Residual current self-checking circuit for miniature circuit breaker Download PDFInfo
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- CN211826372U CN211826372U CN202020121497.3U CN202020121497U CN211826372U CN 211826372 U CN211826372 U CN 211826372U CN 202020121497 U CN202020121497 U CN 202020121497U CN 211826372 U CN211826372 U CN 211826372U
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Abstract
The utility model relates to a residual current self-checking circuit for a miniature circuit breaker, which comprises a self-checking chip; the power input circuit comprises two input ends and is electrically connected with the self-test chip; the residual current sampling circuit is electrically connected with the self-checking chip to obtain a residual current value; the residual current generating circuit is electrically connected with the self-checking chip and generates a residual current test signal according to a set time interval; residual current trip circuit, be connected with the self-checking chip electricity, and can be controlled by the self-checking chip and produce the dropout action, power input circuit includes the rectifier bridge that links to each other with the input, the output of rectifier bridge is connected with the VCC end and the VDD end of self-checking chip behind the resistance group through two sets of parallelly connected respectively, utilize the digital power supply that a plurality of resistances constitute, provide working power supply to the self-checking chip, the front end input is as electric leakage sampling and electric leakage dropout's power, very big simplification power supply circuit, its required space has been reduced, can satisfy miniature circuit breaker's self-checking circuit installation.
Description
Technical Field
The utility model relates to a circuit breaker control field, concretely relates to a residual current self-checking circuit for miniature circuit breaker.
Background
And to residual current self-checking circuit, it needs to be converted into the operating voltage who supplies power for the controller with the large-voltage, need monitor the input simultaneously again and whether have residual current to produce, consequently it needs complicated transformer to step down the large-voltage on designing power module to the controller can obtain operating voltage, consequently leads to whole power module volume great, leads to miniature circuit breaker's inner space to be not convenient for install residual current self-checking circuit.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide a residual current self-checking circuit for miniature circuit breaker.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a residual current self-checking circuit for a miniature circuit breaker comprises a self-checking chip;
the power input circuit comprises two input ends and is electrically connected with the self-test chip;
the residual current sampling circuit is electrically connected with the self-checking chip to obtain a residual current value;
the residual current generating circuit is electrically connected with the self-checking chip and generates a residual current test signal according to a set time interval;
the residual current tripping circuit is electrically connected with the self-checking chip and can be controlled by the self-checking chip to generate tripping action,
the power input circuit comprises a rectifier bridge connected with an input end, the output end of the rectifier bridge is connected with a VCC end and a VDD end of the self-checking chip respectively after passing through two groups of parallel resistors, and the resistors are at least two resistors connected in series.
The residual current generating circuit comprises a triode Q1 and a triode Q4, the base of the triode Q1 is connected with one end of a resistor R9, the other end of the resistor R9 is electrically connected with a self-checking chip, the emitting electrode of the triode Q1 is grounded, the collector of the triode Q1 sequentially passes through a series resistor R11 and a diode D8 and then is electrically connected with a test signal generating device, the collector of the triode Q4 is connected with the base of the triode Q1, and the base of the triode Q4 is connected with the other end of the resistor R9 through the resistor R7 and is grounded through a capacitor C17.
The residual current tripping circuit comprises a tripping coil, one end of the tripping coil is connected with the input end, the other end of the tripping coil is sequentially connected with a diode D5 and a silicon controlled rectifier Q2, the other end of the silicon controlled rectifier is grounded, and the control end of the silicon controlled rectifier is connected with an output pin of the self-checking chip.
The diode D7 is connected in parallel between the connection node of the diode D5 and the thyristor Q2 and the other pin of the self-checking chip.
The residual current self-checking circuit is provided with a residual current alarm circuit.
The residual current alarm circuit comprises a buzzer alarm circuit and a light emitting tube alarm circuit.
And a change-over switch is arranged between the buzzer alarm circuit and the luminotron alarm circuit.
The residual current alarm circuit is provided with a charge and discharge circuit which is used for primary self-checking and does not alarm.
The utility model has the advantages that: the digital power supply formed by the resistors is used for providing a working power supply for the self-checking chip, and the front-end input is used as a power supply for leakage sampling and leakage tripping, so that a power supply circuit is greatly simplified, the required space is reduced, and the self-checking circuit installation of the miniature circuit breaker can be met.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Fig. 2 is a circuit schematic diagram of a residual current generating circuit.
Fig. 3 is a circuit schematic of a residual current sampling circuit.
Fig. 4 is a circuit schematic of the power input circuit.
Fig. 5 is a circuit schematic of a residual current trip circuit.
Fig. 6 is a circuit schematic diagram of a residual current alarm circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
As shown in the figures, the utility model provides a residual current self-checking circuit for a miniature circuit breaker, which comprises a self-checking chip;
the power input circuit comprises two input ends and is electrically connected with the self-test chip;
the power input circuit comprises a rectifier bridge connected with an input end, the output end of the rectifier bridge is connected with a VCC end and a VDD end of the self-checking chip respectively after passing through two groups of parallel resistors, and the resistors are at least two resistors connected in series.
The rectifier bridge is composed of diodes D1/D2/D3/D4, a resistor R71 is connected with a resistor R72 in series, a resistor R73 is connected with a resistor R74 in series, a resistor R63 is connected with a resistor R64 in series, a resistor R61 is connected with a resistor R62 in series, the first two series resistors are connected with the VCC end of the self-checking chip and the output end of the rectifier bridge after being connected in parallel respectively, the second two series resistors are connected with the VDD end of the self-checking chip and the output end of the rectifier bridge after being connected in parallel respectively, and meanwhile, the connection nodes of the two parallel resistors and the self-checking chip are grounded through a capacitor C6 and an electrolytic capacitor C7 for filtering. And a piezoresistor MYR1 is connected in parallel between the two input ends to protect against surge.
The residual current sampling circuit is electrically connected with the self-checking chip to obtain a residual current value and comprises sampling ends J2 and J3, the two sampling ends are respectively connected with a resistor R2 and a resistor R17 in series, a resistor R1 and a capacitor C1 are sequentially connected between the two sampling ends in parallel, meanwhile, the sampling end J3 is grounded through the capacitor C15, the other end of the resistor R2 is respectively connected with an AMP OUT end of the self-checking chip and a GF-test end of the self-checking chip after being connected with the resistor R3 in series, the other end of the resistor R17 is directly connected with a V + end of the self-checking chip, and meanwhile, filtering is carried OUT through the capacitor C16 to obtain the residual current value in real time and send the detected residual current value to the self-checking chip.
The residual current generating circuit is electrically connected with the self-checking chip and generates a residual current test signal according to a set time interval;
the residual current generating circuit comprises a triode Q1 and a triode Q4, the base of the triode Q1 is connected with one end of a resistor R9, the other end of the resistor R9 is electrically connected with a self-checking chip, the emitting electrode of the triode Q1 is grounded, the collector of the triode Q1 sequentially passes through a series resistor R11 and a diode D8 and then is electrically connected with a test signal generating device, the collector of the triode Q4 is connected with the base of the triode Q1, and the base of the triode Q4 is connected with the other end of the resistor R9 through the resistor R7 and is grounded through a capacitor C17. The test signal generating device generates signals according to a certain time interval, and drives the residual current generating circuit to generate residual current at a certain time interval, so that self-checking operation is realized.
The residual current tripping circuit is electrically connected with the self-checking chip and can be controlled by the self-checking chip to generate tripping action,
the residual current tripping circuit comprises a tripping coil, one end of the tripping coil is connected with the input end, the other end of the tripping coil is sequentially connected with a diode D5 and a silicon controlled rectifier Q2, the other end of the silicon controlled rectifier is grounded, and the control end of the silicon controlled rectifier is connected with an output pin of the self-checking chip.
The diode D7 is connected in parallel between the connection node of the diode D5 and the thyristor Q2 and the other pin of the self-checking chip.
When the residual current is detected, the leakage tripping is realized by controlling the conduction of the controlled silicon.
The residual current self-checking circuit is provided with a residual current alarm circuit which is used for alarming when the residual current is detected.
The residual current alarm circuit comprises a buzzer alarm circuit and a light emitting tube alarm circuit. Namely, the sound alarm by a buzzer or the light alarm by a luminous tube or the sound alarm and the light alarm by the luminous tube are utilized simultaneously.
A change-over switch is arranged between the buzzer alarm circuit and the luminotron alarm circuit and used for changing over of alarm modes, and sound and light can be changed over according to requirements due to the fact that sound alarm is dazzling.
The residual current alarm circuit is provided with a charge and discharge circuit which is used for primary self-checking and does not alarm.
The residual current alarm circuit comprises a buzzer U9 and a light emitting diode D6, wherein the end A of the buzzer is grounded, the end B of the buzzer is connected with an emitter of a triode Q3, the rear end of a collector series resistor R15 of the triode Q3 is connected with an input end N _ LOAD, the rear end of a base series resistor R32 of a triode Q3 is connected with a change-over switch S1, the rear end of the other end series resistor R20 of the change-over switch S1 is connected with an LED pin of a self-checking chip, the rear end of the LED pin of the self-checking chip is connected with the light emitting diode D6 after being connected with a series resistor R8, the end B of the buzzer U9 is grounded through a capacitor C20, the end EN of the self-checking chip is grounded through a capacitor C11, the end CAP of the self-checking chip is grounded through. In order to avoid the alarm caused by the initial self-test during power-on, a charging and discharging circuit is arranged at the other end of the resistor R32, the charging and discharging circuit comprises a diode D9, a capacitor C30 and a resistor C33 which are connected in parallel, one end of the capacitor C30 and one end of the resistor C33 which are connected in parallel are grounded, and the other end of the capacitor C30 and the other end of the resistor C33 are connected in series with a diode D9 for preventing the alarm of a buzzer during the initial power-on.
The examples should not be construed as limiting the present invention, but any modifications made based on the spirit of the present invention should be within the scope of the present invention.
Claims (8)
1. A residual current self-checking circuit for miniature circuit breaker which characterized in that: it comprises a self-checking chip;
the power input circuit comprises two input ends and is electrically connected with the self-test chip;
the residual current sampling circuit is electrically connected with the self-checking chip to obtain a residual current value;
the residual current generating circuit is electrically connected with the self-checking chip and generates a residual current test signal according to a set time interval;
the residual current tripping circuit is electrically connected with the self-checking chip and can be controlled by the self-checking chip to generate tripping action,
the power input circuit comprises a rectifier bridge connected with an input end, the output end of the rectifier bridge is connected with a VCC end and a VDD end of the self-checking chip respectively after passing through two groups of parallel resistors, and the resistors are at least two resistors connected in series.
2. A residual current self-checking circuit for small-sized circuit breakers, as claimed in claim 1, characterized in that: the residual current generating circuit comprises a triode Q1 and a triode Q4, the base of the triode Q1 is connected with one end of a resistor R9, the other end of the resistor R9 is electrically connected with a self-checking chip, the emitting electrode of the triode Q1 is grounded, the collector of the triode Q1 sequentially passes through a series resistor R11 and a diode D8 and then is electrically connected with a test signal generating device, the collector of the triode Q4 is connected with the base of the triode Q1, and the base of the triode Q4 is connected with the other end of the resistor R9 through the resistor R7 and is grounded through a capacitor C17.
3. A residual current self-checking circuit for small-sized circuit breakers, as claimed in claim 1, characterized in that: the residual current tripping circuit comprises a tripping coil, one end of the tripping coil is connected with the input end, the other end of the tripping coil is sequentially connected with a diode D5 and a silicon controlled rectifier Q2, the other end of the silicon controlled rectifier is grounded, and the control end of the silicon controlled rectifier is connected with an output pin of the self-checking chip.
4. A residual current self-checking circuit for small-sized circuit breakers, as claimed in claim 3, characterized in that: the diode D7 is connected in parallel between the connection node of the diode D5 and the thyristor Q2 and the other pin of the self-checking chip.
5. A residual current self-checking circuit for small-sized circuit breakers, as claimed in claim 1, characterized in that: the residual current self-checking circuit is provided with a residual current alarm circuit.
6. The residual current self-checking circuit for small-sized circuit breakers according to claim 5, wherein: the residual current alarm circuit comprises a buzzer alarm circuit and a light emitting tube alarm circuit.
7. The residual current self-checking circuit for small-sized circuit breakers according to claim 6, characterized in that: and a change-over switch is arranged between the buzzer alarm circuit and the luminotron alarm circuit.
8. A residual current self-checking circuit for small-sized circuit breakers, as claimed in claim 7, characterized in that: the residual current alarm circuit is provided with a charge and discharge circuit which is used for primary self-checking and does not alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020121497.3U CN211826372U (en) | 2020-01-19 | 2020-01-19 | Residual current self-checking circuit for miniature circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020121497.3U CN211826372U (en) | 2020-01-19 | 2020-01-19 | Residual current self-checking circuit for miniature circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211826372U true CN211826372U (en) | 2020-10-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020121497.3U Active CN211826372U (en) | 2020-01-19 | 2020-01-19 | Residual current self-checking circuit for miniature circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211826372U (en) |
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- 2020-01-19 CN CN202020121497.3U patent/CN211826372U/en active Active
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