CN210867183U - Quick start protection device of electric current power supply - Google Patents

Abstract

The utility model discloses a quick start protection device of electric current power supply, including step-down transformer, rectification filter circuit, voltage stabilizing circuit, mechanism operation power supply circuit, mechanism operation control circuit. The output end of the step-down transformer is divided into two paths, one path of the step-down transformer supplies power to the internal sampling unit, the control unit, the communication unit and the processing unit through the rectifying and filtering circuit and the voltage stabilizing circuit, the other path of the step-down transformer supplies power to the mechanism operation control circuit through the energy storage and voltage adjustment of the mechanism operation power supply circuit, and the mechanism operation control circuit receives a control signal of the processing unit and controls the on-off state of the power supply line. The circuit utilizes the current transformer in the circuit breaker as an energy acquisition end, has novel conception, simple structure, low cost and mature and reliable design scheme, and solves the problem of reliability caused by failure of an external power supply or an internal circuit of the current rapid protection device.

Description

Quick start protection device of electric current power supply

Technical Field

The utility model relates to an electricity field specifically is a quick start protection device of electric current power supply.

Background

Chinese patent 201821497206.X provides a quick start protection device, which is internally provided with a protection module and a power supply module; in the process of powering on an operating system of the protection device, the protection module provides power-on protection for a power supply circuit, and comprises a processing unit, a sampling unit, a control unit and a communication unit, wherein the sampling unit, the control unit and the communication unit are connected with the processing unit; the sampling unit acquires sampling signals of voltage and current of a plurality of lines for supplying power in real time in the power-on process of an operating system; the processing unit comprises a single chip microcomputer, and the single chip microcomputer receives the sampling signals sent by the sampling unit, monitors the sampling signals and sends control signals; the control unit controls the switching state of the power supply line by sending a control signal to the circuit breaker according to the processing unit; after the protection device operating system is powered on, the communication unit sends a completion signal to the processing unit, and the protection module exits; the input end of the power supply module is connected with an external power supply, such as an AC220V power supply for external secondary equipment, and the power supply module supplies power to each weak current unit for sampling, controlling, communicating, processing and the like after rectification, filtering and voltage stabilization. The circuit breaker is used for cutting off or closing no-load current and load current in a power supply line, and cutting off overload current and short-circuit current under the action of a protection device when a system breaks down, and a current transformer which gets power from the power supply line and provides a tripping signal for the circuit breaker is arranged in the circuit breaker.

One problem in the practical application of this type of quick-start protection device is that: if an external power supply or an internal power supply circuit fails, related equipment, circuits or units of the quick-start protection device cannot work, and then a circuit breaker which is controlled by the quick-start protection device and is connected into a power supply line cannot receive a control signal, so that faults of the power supply line cannot be effectively isolated.

SUMMERY OF THE UTILITY MODEL

For the problem of solving the power module inefficacy that leads to because of external power source or internal circuit inefficacy in the background art, the utility model discloses a current supply unit supplies power to quick starting drive's normal work has been guaranteed.

The utility model adopts the following technical scheme: the utility model provides a quick start protection device of electric current power supply for control circuit breaker isolation power supply line trouble during protection device system starts, include power module and by sampling unit, the control unit, communication unit and the processing unit of power module power supply, power module includes the electric current power supply unit that input and the inside current transformer leading-out terminal of circuit breaker are connected, the electric current power supply unit includes from power module's input extremely step-down transformer (1), rectifier filter circuit (2) and voltage stabilizing circuit (3) that power module's output connected gradually.

In a further improvement, the power module comprises a voltage supply unit with an input end connected with an external power supply.

The protection device is further improved by comprising a mechanism operation power supply circuit and a mechanism operation control circuit, wherein the step-down transformer, the mechanism operation power supply circuit and the mechanism operation control circuit are sequentially connected, and the mechanism operation control circuit receives a control signal of a processing unit of the quick start protection device and controls the on-off state of a power supply line.

The further improvement lies in that the step-down transformer connected with the outlet end of the current transformer in the circuit breaker comprises at least one output.

The further improvement is that the power supply device comprises an operation indicating circuit connected with the output end of the current supply unit.

The further improvement is that the mechanism operation indicating circuit is connected with the output end of the mechanism operation control circuit.

The utility model discloses an actively the effect as follows:

compared with the prior art, the utility model discloses a current power supply unit power supply, this circuit make full use of the inside mutual-inductor of circuit breaker current as the acquisition end of energy, think about novel, simple structure, with low costs adopts ripe design, and reliable operation has solved the reliability problem that current quick protection device external power source or internal circuit became invalid and lead to.

Drawings

FIG. 1 is a schematic diagram of a system configuration according to an embodiment of the present disclosure;

FIG. 2 is a circuit diagram of the current supply unit in the embodiment of FIG. 1;

FIG. 3 is a schematic diagram of the step-down transformer of FIG. 2;

FIG. 4 is a schematic diagram of the rectifying and filtering circuit of FIG. 2;

FIG. 5 is a circuit schematic diagram of the voltage regulator circuit of FIG. 2;

FIG. 6 is a circuit schematic of the operating power supply circuit of the mechanism of FIG. 2;

FIG. 7 is a circuit schematic of the mechanism operation control circuit of FIG. 2;

FIG. 8 is a system diagram according to a second embodiment of the present disclosure;

FIG. 9 is a circuit diagram of the voltage supply unit in the embodiment of FIG. 8.

Detailed Description

Example one

As shown in fig. 1, the present embodiment is a fast start protection device, which includes a power module having a current power supply unit therein; the input end of the current power supply unit is connected with the wire outlet end of an internal current transformer of a circuit breaker which is controlled by a control circuit and used for cutting off or closing a power supply line. As shown in fig. 2, the input ends I0 and I1 of the step-down transformer are connected with the output end of the current transformer inside the circuit breaker as an energy acquisition end; the output end of the power supply circuit is output in two paths, one path supplies power to the sampling unit, the control unit, the communication unit and the processing unit through the rectifying filter circuit, the voltage stabilizing circuit and the work indicating circuit, the other path outputs power to the mechanism operation control circuit through voltage adjustment and energy storage of the mechanism operation power supply circuit, and the mechanism operation control circuit receives a control signal of the processing unit of the quick start protection device and controls the on-off state of the power supply circuit.

As shown in fig. 3, the input ends I0 and I1 of the step-down transformer obtain energy by means of a current transformer inside the circuit breaker, and the step-down transformer outputs energy in two paths: outputs one T13, T14 and outputs two T15, T16.

As shown in fig. 4, the input end of the rectifying and filtering circuit is connected to the output end of the step-down transformer, and the rectifying bridge, the current-limiting resistor R44, the capacitor C50, and the two ends of C50 are connected in sequence from the input end as the output end thereof, so as to output a smooth dc voltage.

As shown in fig. 5, the input end of the voltage stabilizing circuit is connected with the output end of the rectifying and filtering circuit, and from the input end, the voltage stabilizing circuit is internally connected in parallel with the rectifying and voltage stabilizing diode D17 and the input end of the three-terminal regulator U9, and 27V direct-current voltage is output between the cathode and the anode of the voltage stabilizing diode D17; the output end of the three-terminal voltage regulator U9 is connected with a filter capacitor C49 in parallel, and 5V direct-current voltage is output from the positive and negative ends of the filter capacitor C49; the common end and the connection node of the three-terminal voltage regulator U9 are used as the common ground of 5V and 27V direct current; the model of the three-terminal regulator is 78L 05.

The mechanism operation power supply circuit is shown in fig. 6, the input end of the mechanism operation power supply circuit is connected with two output ends T15 and T16 of the step-down transformer, starting from T15, one path of the mechanism operation power supply circuit is charged for C46 through D18, the other path of the mechanism operation power supply circuit is charged for C47 through C46 and D19, and the two ends of the C47 are finally provided with the obtained peak voltage which is twice the output end of the step-down transformer as the output end of the step-.

As shown in fig. 7, the input end of the mechanism operation control circuit is connected with a 27V power supply, and a loop is formed by a mechanism action indicating circuit consisting of a resistor R47 and a light emitting diode D21 and a collector and an emitter of a triode Q6; the base of the triode Q6 receives a control signal of the controller of the quick start protection device, and the output of the collector of Q6 controls the switching state of a power supply line.

The input end of the work indicating circuit is connected with a 5V direct current power supply, the work indicating circuit is formed by connecting a resistor R48 and a light emitting diode D23 in series, and when the current power supply unit works, the work indicating circuit gives out light for indication.

Example two

As shown in fig. 8, the present embodiment is a fast start protection device, which includes a power module having a current power supply unit and a voltage power supply unit therein; the input end of the voltage power supply unit is connected with an external power supply, such as an AC220V power supply for external secondary equipment; when the quick start protection device works normally, the voltage power supply unit supplies power; if the external power supply or the power supply circuit inside the external power supply fails, the current supply circuit establishes normal working voltage to ensure the normal work of the quick start protection device, the voltage power supply unit output ends of the current power supply units are respectively and jointly connected to the power supply module output ends through a diode to form an OR gate with driving capability, for example, the two sets of power supply unit output ends are respectively connected with the anodes of a first diode and a second diode, the cathodes of the first diode and the second diode are connected, and the connection point of the first diode and the second diode is used as the power supply module output end. Due to the reverse cut-off action of the diode, when the voltage power supply unit is acted by an external power supply or an internal circuit, if the output of the voltage power supply unit is lower than the power supply voltage of the current power supply unit, the current power supply unit normally outputs, and the output of the current power supply unit cannot be poured into the voltage power supply unit, namely the output of the power supply module is actually the output of a unit with high voltage in the voltage power supply units of the current power supply unit, so that automatic switching is realized. In other embodiments of the present invention, the logic may be modified by other conventional circuits such as switch circuit and logic module.

As shown in fig. 9, the voltage supply unit starts with PT1L and PT1N connected to an external power source, such as an AC220V power source for a secondary device, as input terminals thereof, an internal circuit is connected in parallel with a voltage dependent resistor VR1, a capacitor C3, a common mode inductor L1 and a relay coil K10 in sequence, a fuse F1 is arranged on the input terminal PT1L, and the input terminals PT1L and PT1N are grounded through a capacitor C1 and a capacitor C2 respectively, are connected to two contact switches of the relay respectively, and are then connected to a primary side of a transformer T1; the input ends of a secondary side rectifier bridge B1 and a three-terminal regulator U1 of the transformer T1 are sequentially connected, and the input end of the three-terminal regulator U1 is further provided with capacitors C7 and C9; the three-terminal regulator U1 output end is used as power supply output and has capacitance C8, C10 and zener diode D2, the three-terminal regulator model is CJ7805, its common terminal and its connected node are used as the common ground of 5V direct current, its output end 5V direct current voltage is the output of the said voltage power supply unit.

The above-described embodiments are merely preferred examples of the present invention and are not exhaustive of the possible implementations of the present invention. Any obvious modifications to the above would be obvious to those of ordinary skill in the art, but would not bring the invention so modified beyond the spirit and scope of the present invention.

Claims (6)

1. The utility model provides a quick start protection device of electric current power supply for control circuit breaker isolation power supply line trouble during protection device system starts, including power module and by sampling unit, the control unit, the communication unit and the processing unit of power module power supply, its characterized in that: the power supply module comprises a current power supply unit, wherein the input end of the current power supply unit is connected with the leading-out terminal of a current transformer in the circuit breaker, and the current power supply unit comprises a step-down transformer (1), a rectification filter circuit (2) and a voltage stabilizing circuit (3) which are sequentially connected from the input end of the power supply module to the output end of the power supply module.

2. The current-powered quick start protection device of claim 1 wherein said power module comprises a voltage supply unit having an input connected to an external power source.

3. A current-powered quick start protection device as claimed in claim 1, wherein: the protection device is characterized by further comprising a mechanism operation power circuit (4) and a mechanism operation control circuit (5), wherein the step-down transformer (1), the mechanism operation power circuit (4) and the mechanism operation control circuit (5) are sequentially connected, and the mechanism operation control circuit (5) receives a control signal of a processing unit of the quick start protection device and controls the on-off state of a power supply line.

4. A current-powered quick start protection device as claimed in claim 1, wherein: the step-down transformer (1) connected with the outlet end of the current transformer in the circuit breaker comprises at least one output.

5. A current-powered quick start protection device as claimed in claim 1, wherein: comprises a work indicating circuit (6) connected with the output end of the current supply unit.

6. A current-powered quick start protection device as claimed in claim 3, wherein: comprises a mechanism action indicating circuit connected with the output end of a mechanism operation control circuit (5).

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