CN211266783U - Power supply circuit with external circuit breaker of electric energy meter with residual current function - Google Patents
Power supply circuit with external circuit breaker of electric energy meter with residual current function Download PDFInfo
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- CN211266783U CN211266783U CN202020117341.8U CN202020117341U CN211266783U CN 211266783 U CN211266783 U CN 211266783U CN 202020117341 U CN202020117341 U CN 202020117341U CN 211266783 U CN211266783 U CN 211266783U
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Abstract
The utility model relates to a power supply circuit of an external circuit breaker of an electric energy meter with residual current function, which comprises an input circuit and a power grid, wherein the input circuit is electrically connected with the power grid; the power supply control circuit is respectively electrically connected with the input circuit and the voltage reduction circuit and is used for regulating output voltage; the input end of the voltage reduction circuit is connected with the input circuit, and the output end of the voltage reduction circuit is connected with the output circuit; and the output circuit is used for outputting working voltage, an auxiliary power supply is arranged between the input circuit and the voltage reduction circuit, and the output end of the auxiliary power supply is connected with the output end of the output circuit in parallel. Through setting up auxiliary power source, utilize it to carry out the quick power supply to whole circuit, satisfy the circuit breaker and get the electricity fast, realize more reliable protection.
Description
Technical Field
The utility model belongs to the low voltage apparatus field, concretely relates to power supply circuit with external circuit breaker of residual current function electric energy meter.
Background
Generally, a power supply of the circuit breaker is stepped down by using a transformer, but the power supply has certain hysteresis at the time of starting and cannot meet the requirement of instantaneous starting of the circuit breaker.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide a power supply circuit with external circuit breaker of residual current function electric energy meter.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a power supply circuit with an external circuit breaker of an electric energy meter with residual current function comprises
The input circuit is electrically connected with a power grid;
the power supply control circuit is respectively electrically connected with the input circuit and the voltage reduction circuit and is used for regulating output voltage;
the input end of the voltage reduction circuit is connected with the input circuit, and the output end of the voltage reduction circuit is connected with the output circuit;
an output circuit for outputting a working voltage,
an auxiliary power supply is arranged between the input circuit and the voltage reduction circuit, and the output end of the auxiliary power supply is connected with the output end of the output circuit in parallel.
The auxiliary power supply includes:
the voltage Vls is led out from the node of the series resistor and the voltage regulator tube D3 and is grounded through a resistor R18 and a capacitor C15 which are connected in parallel.
And a tripping circuit is connected in parallel between the two input ends of the input circuit.
The tripping circuit comprises a tripping coil connected with the input end L in parallel, the other end of the tripping coil is connected with the anode of a controlled silicon D2, the cathode of the controlled silicon D2 is connected with the input end N, and the control end of the controlled silicon D2 is electrically connected with a residual current tripping signal generating device.
And a diode D1 is connected in series at one end of the input end L phase connected with the trip coil.
One end of the input circuit connected with the auxiliary power supply is connected with a resistor Rx2 in series.
And one end of the input end of the voltage reduction circuit, which is connected with the auxiliary power supply, is connected with a diode D4 in series.
The power control circuit comprises a power chip U8 and a protection circuit.
And a feedback circuit is arranged between the power supply chip U8 and the output end of the voltage reduction circuit.
And the output end of the output circuit is electrically connected with the voltage stabilizing circuit.
The utility model has the advantages that: through setting up auxiliary power source, utilize it to carry out the quick power supply to whole circuit, satisfy the circuit breaker and get the electricity fast, realize more reliable protection.
Drawings
Fig. 1 is a part 1 of a schematic circuit diagram of the present invention.
Fig. 2 is a part 2 of the circuit schematic of the present invention.
Fig. 3 is a part 3 of the circuit schematic of the present invention.
Fig. 4 is a part 4 of the circuit schematic of the present invention.
Detailed Description
And the complete circuit schematic diagram is formed by sequentially splicing the figure 1, the figure 2, the figure 3 and the figure 4.
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 figure, the utility model provides a power supply circuit with external circuit breaker of residual current function electric energy meter, it includes
The input circuit is electrically connected with a power grid;
the input circuit comprises an input end L phase and an input end N phase, a piezoresistor RV3 is connected between the input end L phase and the input end N phase in parallel, and the effect of preventing surge at the front end is achieved
The power supply control circuit is respectively electrically connected with the input circuit and the voltage reduction circuit and is used for regulating output voltage;
the input end of the voltage reduction circuit is connected with the input circuit, and the output end of the voltage reduction circuit is connected with the output circuit; the step-down circuit comprises a transformer T2, wherein pin 1 of the transformer is connected with the input circuit, pin 4 of the transformer is connected with one pin of the power supply control circuit, pin 8 of the transformer outputs working voltage, pin 7 of the transformer is grounded, and pin 6 of the transformer is connected with the other pin of the power supply control circuit through a diode D11 and a resistor R37 in sequence
The output circuit is used for outputting the working voltage, the working voltage is 12V, the output voltage is preferably filtered by grounding through a parallel capacitor C23 and an electrolytic capacitor C24, and meanwhile, the 8 pin of the transformer T2 outputs 12V after passing through a diode D13.
Be equipped with auxiliary power supply between input circuit and the step-down circuit, auxiliary power supply's output and output circuit's output parallel arrangement utilize auxiliary power supply's power supply to carry out the fast power supply before the step-down circuit does not work, satisfy the normal work demand of circuit breaker.
The auxiliary power supply includes:
the output end of the input circuit outputs a voltage Vls through a plurality of resistors connected in series, and the voltage Vls is grounded through a voltage stabilizing tube D3, a resistor R18 and a capacitor C15 which are connected in parallel. The output voltage of the input circuit is reduced by serially connecting the resistor R11, the resistor R14 and the resistor R17 to realize the output of the voltage Vls, and meanwhile, the voltage is stabilized by using the voltage stabilizing tube D3, and the output voltage Vls is ensured to be stable by filtering through the resistor R18 and the capacitor C15.
And a tripping circuit is connected in parallel between the two input ends of the input circuit.
The tripping circuit comprises a tripping coil connected with the input end L in parallel, the other end of the tripping coil is connected with the anode of a controlled silicon D2, the cathode of the controlled silicon D2 is connected with the input end N, and the control end of the controlled silicon D2 is electrically connected with a residual current tripping signal generating device. The signal generating device is connected with a port trip and used for sending a residual current tripping signal, the port trip is connected with the control end of the controllable silicon D2 through a resistor, and the control end of the port trip is grounded through a capacitor C9, so that the reliability of the signal is ensured.
The diode D1 is connected in series with the end of the input end L phase connected with the trip coil, and the problem that the thyristor cannot be disconnected is avoided by arranging the diode D1, so that the reliability of residual current operation is ensured.
One end of the input circuit connected with the auxiliary power supply is connected with a resistor Rx2 in series, and a piezoresistor RV5 is connected between one end of a resistor Rx2 and the input end N in parallel.
One end of the input end of the voltage reduction circuit, which is connected with the auxiliary power supply, is connected with a diode D4 in series, and the cathode of the diode D4 is grounded through an electrolytic capacitor CB 1.
The power control circuit comprises a power chip U8 and a protection circuit, wherein the protection circuit comprises a resistor R23, a resistor R24 and a capacitor C22 which are connected in parallel, one end of the resistor R23, the resistor R24 and the capacitor C22 which are connected in parallel are connected with a pin 1 of a transformer T2, the other end of the resistor R22 is connected with a cathode of a diode D10, an anode of the diode D10 is connected with a pin 5 and a pin 6 of the power chip U8, a pin 4 of the transformer T2 is connected with a pin 5 and a pin 6 of the power chip U8, a GND end of the power chip U8 is grounded, and a pin 4 series resistor R25 of the transformer T2 is grounded.
The pin 8 of the transformer T2 is connected with the pin 3 of the power supply chip U8 through a resistor R27, the pin 3 of the power supply chip U8 is grounded through a resistor R38, and the pin 1 of the power supply chip U8 is grounded through an electrolytic capacitor C29.
A feedback circuit is arranged between the power supply chip U8 and the output end of the voltage reduction circuit, 8 peripheral devices such as an optical coupler and a TL431 feedback network are saved by using primary side feedback, the number of parts of the power supply module is greatly reduced, and the cost is reduced.
And the output end of the output circuit is electrically connected with the voltage stabilizing circuit.
And the output end of the auxiliary power supply is electrically connected with the voltage stabilizing circuit.
The voltage stabilizing circuit comprises a voltage stabilizing chip U4, wherein the input end of the voltage stabilizing chip U4 is respectively connected with a power supply 12V and a voltage Vls, the voltage Vls is connected with the input end of a voltage stabilizing chip U4 through a diode D14A, the voltage 12V is connected with the input end of a voltage stabilizing chip U4 through a diode D14B, when the voltage 12V is not in place, the voltage Vls can be used for quickly supplying power to provide the working voltage of the whole circuit breaker, and the output end of the voltage stabilizing chip outputs a power supply VDD.
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 (10)
1. The utility model provides a power supply circuit with external circuit breaker of residual current function electric energy meter which characterized in that: which comprises
The input circuit is electrically connected with a power grid;
the power supply control circuit is respectively electrically connected with the input circuit and the voltage reduction circuit and is used for regulating output voltage;
the input end of the voltage reduction circuit is connected with the input circuit, and the output end of the voltage reduction circuit is connected with the output circuit;
an output circuit for outputting a working voltage,
an auxiliary power supply is arranged between the input circuit and the voltage reduction circuit, and the output end of the auxiliary power supply is connected with the output end of the output circuit in parallel.
2. The power supply circuit with the external circuit breaker of the residual current functional electric energy meter according to the claim 1, characterized in that: the auxiliary power supply includes:
the voltage Vls is led out from the node of the series resistor and the voltage regulator tube D3 and is grounded through a resistor R18 and a capacitor C15 which are connected in parallel.
3. The power supply circuit with the external circuit breaker of the residual current functional electric energy meter according to the claim 1, characterized in that: and a tripping circuit is connected in parallel between the two input ends of the input circuit.
4. A power supply circuit with an external circuit breaker for an electric energy meter with residual current functionality according to claim 3, characterized in that: the tripping circuit comprises a tripping coil connected with the input end L in parallel, the other end of the tripping coil is connected with the anode of a controlled silicon D2, the cathode of the controlled silicon D2 is connected with the input end N, and the control end of the controlled silicon D2 is electrically connected with the residual current tripping generating device.
5. A power supply circuit with an external circuit breaker for an electric energy meter with residual current function according to claim 4, characterized in that: and a diode D1 is connected in series at one end of the input end L phase connected with the trip coil.
6. A power supply circuit with an external circuit breaker for an electric energy meter with residual current function according to claim 1 or 2, characterized in that: one end of the input circuit connected with the auxiliary power supply is connected with a resistor Rx2 in series.
7. A power supply circuit with an external circuit breaker for an electric energy meter with residual current function according to claim 1 or 2, characterized in that: and one end of the input end of the voltage reduction circuit, which is connected with the auxiliary power supply, is connected with a diode D4 in series.
8. The power supply circuit with the external circuit breaker of the residual current functional electric energy meter according to the claim 1, characterized in that: the power control circuit comprises a power chip U8 and a protection circuit.
9. A power supply circuit with an external circuit breaker for an electric energy meter with residual current functionality according to claim 8, characterized in that: and a feedback circuit is arranged between the power supply chip U8 and the output end of the voltage reduction circuit.
10. The power supply circuit with the external circuit breaker of the residual current functional electric energy meter according to the claim 1, characterized in that: and the output end of the output circuit is electrically connected with the voltage stabilizing circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020117341.8U CN211266783U (en) | 2020-01-19 | 2020-01-19 | Power supply circuit with external circuit breaker of electric energy meter with residual current function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020117341.8U CN211266783U (en) | 2020-01-19 | 2020-01-19 | Power supply circuit with external circuit breaker of electric energy meter with residual current function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211266783U true CN211266783U (en) | 2020-08-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020117341.8U Active CN211266783U (en) | 2020-01-19 | 2020-01-19 | Power supply circuit with external circuit breaker of electric energy meter with residual current function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211266783U (en) |
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2020
- 2020-01-19 CN CN202020117341.8U patent/CN211266783U/en active Active
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