CN206977324U - Power circuit for low-voltage circuit breaker - Google Patents
Power circuit for low-voltage circuit breaker Download PDFInfo
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- CN206977324U CN206977324U CN201720891640.5U CN201720891640U CN206977324U CN 206977324 U CN206977324 U CN 206977324U CN 201720891640 U CN201720891640 U CN 201720891640U CN 206977324 U CN206977324 U CN 206977324U
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Abstract
The utility model discloses a kind of power circuit for low-voltage circuit breaker; including reduction voltage circuit and rectification circuit; the power circuit that the input connection low-voltage circuit breaker of reduction voltage circuit is protected; low-voltage ac signal rectification is direct current signal and provides the power supply of the control circuit of low-voltage circuit breaker by the output end output low-voltage ac signal and input rectification circuit of reduction voltage circuit, rectification circuit.This power circuit for low-voltage circuit breaker provided by the utility model, the form of decompression and rectification is used to provide reliable power supply supply for the control circuit of low-voltage circuit breaker, and the device of circuit is few, cost is low, circuit is simple and reliable, the normal power source supply of control circuit can still be ensured when two-phase dead electricity occurs for three phase mains, therefore reliability is high.
Description
Technical field
The utility model is specifically related to a kind of power circuit for low-voltage circuit breaker.
Background technology
With the development and the improvement of people's living standards of economic technology, electric energy has become in people's production and life
Essential secondary energy sources, production and life to people bring endless facility.
But electric energy is because its is untouchable and high risk sexual, just along with all kinds of safeguard measures since its generation.It is low
Voltage breaker is protection equipment important in network system, is a kind of can not only connect and disjunction normal duty electric current and excessively negative
Charged current, the device for switching with disjunction short circuit current can also be connected.The controller used in low-voltage circuit breaker, power supply are general
For electric current authigenic power supply, or use external auxiliary power supply.If single use electric current authigenic power supply, due to being taken using current transformer
The mode of electricity, when primary current is smaller in breaker, current transformer can not get enough energy from loop.Cause open circuit
The controller of device can not normal work.If using external auxiliary power supply, additional power source module is needed.Volume is caused to increase, it is difficult to
Apply the occasion in restricted volume.And external power source module needs connecting line to be connected with breaker controller, it is readily incorporated new
Interference, have a negative impact to equipment operation.
Utility model content
The purpose of this utility model, which is to provide, a kind of powers that reliable, circuit is simple, cost is cheap is used for low pressure open circuit
The power circuit of device.
This power circuit for low-voltage circuit breaker provided by the utility model, including reduction voltage circuit and rectification circuit,
The power circuit that the input connection low-voltage circuit breaker of reduction voltage circuit is protected, the output end output low-voltage alternating-current letter of reduction voltage circuit
Number and input rectification circuit, rectification circuit by low-voltage ac signal rectification be direct current signal and provide low-voltage circuit breaker control electricity
The power supply on road.
Described low-voltage circuit breaker is three-phase low-voltage breaker.
The described power circuit for low-voltage circuit breaker also includes surge absorbing circuit；Surge absorbing circuit is connected to drop
Between the power circuit that the input and low-voltage circuit breaker of volt circuit are protected, for absorbing the surging signal of power circuit.
The described power circuit for low-voltage circuit breaker also includes clamp freewheeling circuit；Clamp afterflow is connected to rectified current
Between the input and ground on road, for protecting the rectification circuit of rear end and carrying out afterflow to the power circuit.
The described power circuit for low-voltage circuit breaker also includes filter circuit；Filter circuit is connected to rectification circuit
Between output end and ground, for filtering out the noise signal of power supply.
Described surge absorbing circuit is the surge absorbing circuit being made up of resistance.
Described reduction voltage circuit is the reduction voltage circuit being made up of electric capacity.
Described rectification circuit is the half-wave rectifying circuit being made up of diode.
Described clamp freewheeling circuit is the clamp freewheeling circuit being made up of voltage-regulator diode.
Described filter circuit is capacitor filter.
This power circuit for low-voltage circuit breaker provided by the utility model, the form of decompression and rectification is used to be low
The control circuit of voltage breaker provides reliable power supply supply, and the device of circuit is few, and cost is low, and circuit is simple and reliable,
Three phase mains can still ensure the normal power source supply of control circuit, therefore reliability pole when two-phase dead electricity occurs
It is high.
Brief description of the drawings
Fig. 1 is functional block diagram of the present utility model.
Fig. 2 is a kind of circuit theory diagrams of the utility model in three-phase applications.
Embodiment
It is functional block diagram of the present utility model as shown in Figure 1：It is provided by the utility model this to be used for low-voltage circuit breaker
Power circuit, including surge absorbing circuit, reduction voltage circuit, rectification circuit, filter circuit and clamp freewheeling circuit, surge absoption
It is electrically connected between the power circuit that the input of reduction voltage circuit and low-voltage circuit breaker are protected, for absorbing power circuit
Surging signal；The output end of the input connection surge absorbing circuit of reduction voltage circuit, the output end output low pressure of reduction voltage circuit are handed over
Signal and input rectification circuit are flowed, low-voltage ac signal rectification is direct current signal by rectification circuit, and is filtered out by filter circuit
After the noise signal of power supply, there is provided the power supply of the control circuit of low-voltage circuit breaker.Clamp afterflow is connected to the input of rectification circuit
Between end and ground, for protecting the rectification circuit of rear end and carrying out afterflow to the power circuit.Low-voltage circuit breaker then includes three
Phase low-voltage circuit breaker.
It is illustrated in figure 2 a kind of circuit theory diagrams of the utility model in three-phase applications：UA, UB, UC tri- in figure
Cross streams power line, UN are the neutral conductor of three-phase alternating current system；Resistance R1, R2 and R3 constitute surge absorbing circuit；Electric capacity C1,
C2 and C3 constitute reduction voltage circuit；Z1, Z2 and Z3 are protection diode, and constitute clamp freewheeling circuit；D1, D2 and D3 are whole
Diode is flowed, three constitutes rectification circuit；Electric capacity C4 then constitutes filter circuit；Load RL in figure is signal for low
The power supply load of the power circuit of voltage breaker.
Surge absoption resistance R1~R3 one end is connected with A, B, C three-phase alternating-current supply respectively, and the other end is electric with decompression respectively
Hold C1~C3 to be connected, decompression capacitor C1~C3 other ends anode and voltage-regulator diode with commutation diode D1~D3 respectively
Z1~Z3 negative electrode is connected.The negative electrode of the commutation diode D1~D3 is connected with the positive pole of the filter capacitor C4, as electricity
Source output plus terminal VCC.The negative pole and three-phase alternating current of the anode of the voltage-regulator diode Z1~Z3 and the filter capacitor C4
The N in source is extremely connected, as power supply output negative terminal GND.
The above-mentioned power circuit for low-voltage circuit breaker in three-phase applications, specific work process are as follows：
Analyzed with A phases, when ac voltage signal is in positive half cycle, forward current passes through resistance R1, electric capacity from UA
C1, commutation diode D1, load to UN formation loop.
When AC signal voltage is in negative half period, electric current passes through voltage-regulator diode Z1, electric capacity C1, resistance R1 to UA from UN
Form loop.
Derided capacitors C1~C3 is decompression capacitor.The capacitive reactance of its electric capacity is：Xc=1/ (2 π * F*C), wherein F is alternating current
The frequency of pressure, C are the capacity of high-voltage capacitance.
When circuit is run, electric current is limited by the capacitive reactance of decompression capacitor, load end output voltage depends on load impedance
Size, when load impedance is smaller, due to the current limliting of decompression capacitor, its load terminal voltage VCC is also smaller, when load impedance compared with
When big, by the pressure stabilization function of voltage-regulator diode, make VCC terminal voltages constant on the clamp voltage of voltage-regulator diode.
Resistance R1~R3 is Surge suppression resistance, for suppressing surge current in power supply electrifying, ensure circuit not because
Startup surge current is excessive and damages.
When circuit is run, even if there is two-phase dead electricity in three phase mains, it still can ensure that power supply power supply is normal.If in circuit
N poles disconnect, it is also ensured that the power supply of circuit is normal.Substantially increase the reliability of power supply.
This power circuit for low-voltage circuit breaker provided by the utility model, it can be also used for other any need and adopt
The electronic equipment being powered with AC power, including all types of measuring instruments (such as electric energy meter, water meter, gas meter, flow meter, heat
Table etc.), electric energy management terminal, distribution terminal, electric energy quality monitoring equipment, grid automation terminal, acquisition terminal, concentrator,
Data acquisition unit, fault detector etc..
Claims (10)
1. a kind of power circuit for low-voltage circuit breaker, it is characterised in that including reduction voltage circuit and rectification circuit, reduction voltage circuit
The power circuit protected of input connection low-voltage circuit breaker, the output end output low-voltage ac signal of reduction voltage circuit simultaneously inputs
Low-voltage ac signal rectification is direct current signal and provides the electricity of the control circuit of low-voltage circuit breaker by rectification circuit, rectification circuit
Source.
2. the power circuit according to claim 1 for low-voltage circuit breaker, it is characterised in that described low-voltage circuit breaker
For three-phase low-voltage breaker.
3. the power circuit according to claim 1 for low-voltage circuit breaker, it is characterised in that described to break for low pressure
The power circuit of road device also includes surge absorbing circuit；Surge absorbing circuit is connected to input and the low pressure open circuit of reduction voltage circuit
Between the power circuit that device is protected, for absorbing the surging signal of power circuit.
4. the power circuit according to claim 1 for low-voltage circuit breaker, it is characterised in that described to break for low pressure
The power circuit of road device also includes clamp freewheeling circuit；Clamp afterflow is connected between the input of rectification circuit and ground, is used for
Protect the rectification circuit of rear end and afterflow is carried out to the power circuit.
5. the power circuit according to claim 1 for low-voltage circuit breaker, it is characterised in that described to break for low pressure
The power circuit of road device also includes filter circuit；Filter circuit is connected between the output end of rectification circuit and ground, for filtering out
The noise signal of power supply.
6. the power circuit according to claim 3 for low-voltage circuit breaker, it is characterised in that described surge absoption electricity
Road is the surge absorbing circuit being made up of resistance.
7. the power circuit for low-voltage circuit breaker according to one of claim 1~6, it is characterised in that described decompression
Circuit is the reduction voltage circuit being made up of electric capacity.
8. the power circuit for low-voltage circuit breaker according to one of claim 1~6, it is characterised in that described rectification
Circuit is the half-wave rectifying circuit being made up of diode.
9. the power circuit according to claim 4 for low-voltage circuit breaker, it is characterised in that described clamp afterflow electricity
Road is the clamp freewheeling circuit being made up of voltage-regulator diode.
10. the power circuit according to claim 5 for low-voltage circuit breaker, it is characterised in that described filter circuit is
Capacitor filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720891640.5U CN206977324U (en) | 2017-07-21 | 2017-07-21 | Power circuit for low-voltage circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720891640.5U CN206977324U (en) | 2017-07-21 | 2017-07-21 | Power circuit for low-voltage circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206977324U true CN206977324U (en) | 2018-02-06 |
Family
ID=61397144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720891640.5U Active CN206977324U (en) | 2017-07-21 | 2017-07-21 | Power circuit for low-voltage circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206977324U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110071488A (en) * | 2019-03-25 | 2019-07-30 | 天津大学 | DC power supply and its control method suitable for adaptive throttling DC solid circuit breaker |
-
2017
- 2017-07-21 CN CN201720891640.5U patent/CN206977324U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110071488A (en) * | 2019-03-25 | 2019-07-30 | 天津大学 | DC power supply and its control method suitable for adaptive throttling DC solid circuit breaker |
| CN110071488B (en) * | 2019-03-25 | 2022-01-04 | 天津大学 | Direct-current power supply suitable for self-adaptive current-limiting direct-current solid-state circuit breaker and control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 411201 28 Bai Shi Road, Jing Kai District, Xiangtan, Hunan Patentee after: Weisheng Energy Technology Co.,Ltd. Address before: 411201 No. 28 Baishi Road, Economic Development Zone, Xiangtan City, Hunan Province Patentee before: WASION ELECTRIC Co.,Ltd. |
|
| CP03 | Change of name, title or address |