CN214205082U - Dual-power delay switching circuit for PT power taking - Google Patents
Dual-power delay switching circuit for PT power taking Download PDFInfo
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- CN214205082U CN214205082U CN202023239526.5U CN202023239526U CN214205082U CN 214205082 U CN214205082 U CN 214205082U CN 202023239526 U CN202023239526 U CN 202023239526U CN 214205082 U CN214205082 U CN 214205082U
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Abstract
The utility model discloses a dual supply time delay switching circuit for PT gets electricity, including alternating current-direct current conversion module, delay circuit, on-off control module and relay K2, relay K2 includes the first input of connecting the main power source through on-off control module to and connect stand-by power supply's second input, still include a set of output, relay K2's change over switch is used for selecting first input or second input and output intercommunication. The alternating current-direct current conversion module is used for converting alternating current output by the main power supply into direct current, and the output end of the alternating current-direct current conversion module is connected with the control end of the on-off control module through the delay circuit. The utility model discloses can guarantee switching speed when double-circuit power switches, can avoid the phenomenon of striking sparks again.
Description
Technical Field
The utility model relates to a power supply switching technology field, concretely relates to a dual supply time delay switching circuit for PT gets electricity.
Background
On a Feeder Terminal (FTU) of a power distribution network, the device needs to meet a double-alternating-current power supply mode, and PT power taking needs to be supported when power is supplied by an alternating-current power supply. When the power is supplied by the dual PT system, power is normally supplied from a power source between the power source side A, B phase and the load side B, C phase. Because of the phase disparity of the A, C phases, sparking occurs during power switching. Therefore, when a double-circuit power supply switching circuit is designed, the switching speed is guaranteed to be fast enough, the normal work of the FTU cannot be influenced, the ignition phenomenon caused by switching is avoided, and equipment damage is prevented.
SUMMERY OF THE UTILITY MODEL
The utility model provides a dual supply time delay switching circuit for PT gets electricity, its purpose: the defects of the prior art are overcome, the switching speed is ensured when the double-circuit power supply is switched, and the phenomenon of sparking is avoided.
The utility model discloses technical scheme as follows:
the utility model provides a dual supply time delay switching circuit for PT gets electricity, includes alternating current-direct current conversion module, delay circuit, on-off control module and relay K2, and relay K2 includes the first input of connecting the main power source through the on-off control module to and connect stand-by power supply's second input, still includes a set of output, and relay K2's change over switch is used for selecting to communicate first input or second input and output.
The alternating current-direct current conversion module is used for converting alternating current output by the main power supply into direct current, and the output end of the alternating current-direct current conversion module is connected with the control end of the on-off control module through the delay circuit.
Further, the alternating current-direct current conversion module comprises an RC circuit, a rectifier bridge D1 and a voltage stabilizing circuit, the main power supply is connected to the rectifier bridge D1 through the RC circuit, the voltage stabilizing circuit comprises a voltage stabilizing diode D2 and a voltage stabilizing diode D3 which are connected between two output ends of the rectifier bridge D1 in series, and forward current conducting directions of the voltage stabilizing diode D2 and the voltage stabilizing diode D3 are from a negative output end of the rectifier bridge D1 to a positive output end of the rectifier bridge D1.
Further, the on-off control module comprises a triode Q1 and a relay K1, wherein the triode Q1 is connected in series with a coil of the relay K1 and is used for amplifying the control signal output by the delay circuit and controlling the action of the relay K1.
Further, the delay circuit comprises a resistor R2, a resistor R3 and a capacitor C3, the positive output end of the AC/DC conversion module is connected with the output end of the delay circuit through the resistor R2, and the output end of the delay circuit is connected with the negative output end of the AC/DC conversion module through the resistor R3 and the capacitor C3 which are connected in parallel.
Further, the delay circuit further comprises a diode D4 and a diode D5, the diode D4 and the diode D5 are connected in series and then connected in parallel with the capacitor C3, and the current conduction direction of the diode D4 and the diode D5 is from the output end of the delay circuit to the negative output end of the alternating current-direct current conversion module.
Further, the output of the alternating current-direct current conversion module is a 24V direct current power supply.
Compared with the prior art, the utility model discloses following beneficial effect has:
(1) the utility model discloses can realize the automatic switch-over of dual supply, can realize supplying power for the FTU when the power of arbitrary all the way of main power source and stand-by power source has the electricity, through simple RC delay circuit, realize the time delay switch-over of dual supply, avoided the phenomenon of striking sparks that leads to because of the power phase place is inconsistent;
(2) a discharge loop formed by a diode and a resistor is added in the circuit, so that the electric quantity in the discharge capacitor can be quickly discharged when the main power supply is powered off, and the delay failure caused by the instant power-off of the main power supply is avoided;
(3) the utility model discloses circuit structure is simple, only needs a small number of components and parts can realize the functional logic.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
The technical scheme of the utility model is explained in detail below with the attached drawings:
like figure 1, a dual supply time delay switching circuit for PT gets electricity, including alternating current-direct current conversion module, delay circuit, on-off control module and relay K2, relay K2 includes the first input end of connecting the main power source through the on-off control module to and connect stand-by power supply's second input, still include a set of output, relay K2's change over switch is used for selecting to communicate first input or second input and output.
The alternating current-direct current conversion module is used for converting alternating current output by the main power supply into direct current, and the output end of the alternating current-direct current conversion module is connected with the control end of the on-off control module through the delay circuit.
Further, the alternating current-direct current conversion module comprises an RC circuit, a rectifier bridge D1 and a voltage stabilizing circuit, a live wire L1 of the main power supply is connected to a zero wire N1 of the main power supply through a rectifier bridge D1 after passing through the RC circuit, a capacitor C2 is connected between two output ends of the rectifier bridge D1, and a negative output end of the rectifier bridge D1 is connected with a GND end. The voltage stabilizing circuit comprises a voltage stabilizing diode D2 and a voltage stabilizing diode D3 which are connected between two output ends of a rectifier bridge D1 in series, the forward current conducting direction of the voltage stabilizing diode D2 and the voltage stabilizing diode D3 is from the negative output end of the rectifier bridge D1 to the positive output end of the rectifier bridge D1, and the voltage stabilizing circuit is used for stabilizing the direct-current power supply output by the rectifier bridge D1 to 24V.
The delay circuit comprises a resistor R2, a resistor R3 and a capacitor C3, wherein the positive output end of the alternating current-direct current conversion module is connected with the output end of the delay circuit through the resistor R2, and the output end of the delay circuit is connected with the negative output end of the alternating current-direct current conversion module through the resistor R3 and the capacitor C3 which are connected in parallel. The delay circuit is used for controlling the relay K1 to perform delay action, the delay circuit realizes delay switching of double power supplies, and the phenomenon of sparking caused by inconsistent power supply phases is avoided.
The time delay circuit further comprises a diode D4 and a diode D5, the diode D4 and the diode D5 are connected in series and then connected with the capacitor C3 in parallel, and the current conducting direction of the diode D4 and the diode D5 is from the output end of the time delay circuit to the negative output end of the alternating current-direct current conversion module. Diode D4, diode D5 and electric capacity C3 constitute the return circuit that discharges, the electric quantity in the return circuit can let out the electric capacity in the discharge capacity fast when the main power loses power, avoids leading to the time delay inefficacy because of the instantaneous outage of main power.
The on-off control module comprises a triode Q1 and a relay K1, wherein the triode Q1 is connected with a coil of the relay K1 in series and is used for amplifying a control signal output by the delay circuit and controlling the action of the relay K1. Specifically, a diode D6 is connected between the first coil pin and the second coil pin of the relay K1, and the current conducting direction of the diode D6 is from the second coil pin to the first coil pin. A first coil pin of the relay K1 is connected to the positive output end of the rectifier bridge D1, a second coil pin of the relay K1 is connected to the collector electrode of the triode Q1, and the emitter electrode of the triode Q1 is connected with the GND end. The normally open contact of the relay K1 is connected with the live wire L1 of the main power supply, and the common end of the relay K1 is connected with the normally open contact of the first change-over switch of the relay K2.
A normally closed contact of a first change-over switch of the relay K2 is connected with a live wire L2 of a standby power supply, a normally open contact of a second change-over switch of the relay K2 is connected with a zero line N1 of a main power supply, a normally closed contact of the second change-over switch is connected with a zero line N2 of the standby power supply, and a common end of the first change-over switch and a common end of the second change-over switch of the relay K2 are respectively connected to the live wire L of a device power supply and the zero line N of the device power supply for supplying power to the FTU; two coil pins of the relay K2 are respectively connected with two output ends of a main power supply.
The working principle of the circuit is as follows:
when the main power supply is in power failure and the standby power supply is in power on, the relay K2 is in a power failure state, and the standby power supply supplies power to the device through the normally closed contacts of the two groups of change-over switches of the relay K2;
when a main power supply is powered on, the relay K2 is powered on immediately, the positions of two groups of change-over switches of the relay K2 are switched from normally closed contacts to normally open contacts, at the moment, because the relay K1 is not powered on, the normally open contacts of the relay K1 are in a disconnected state, a power supply of a live wire L1 of the main power supply is not sent to the normally open contacts of the first change-over switch of the relay K2, and the relay K2 is not powered on when acting;
when the main power supply is powered on, the main power supply rectifies and outputs direct-current voltage after passing through a resistor R1, a capacitor C1 and a rectifier bridge D1, charges the capacitor C1, and regulates the direct-current voltage to 24V through a voltage stabilizing diode D2 and a voltage stabilizing diode D3; the direct current 24V is connected with a first coil pin of a relay K1, a capacitor C3 is charged through a resistor R2, after time delay, a triode Q1 is conducted, a second coil pin of a relay K1 is conducted with a GND end, a relay K1 is electrified, and a normally open contact of a relay K1 is closed; at this moment, the main power supply supplies power to the device through a relay K1 and a relay K2 to complete the power supply switching action;
when the main power supply is powered off, the relay K2 is powered off immediately, the positions of two groups of transfer switches of the relay K2 are switched from normally open contacts to normally closed contacts, and the power supply of the device is provided by a standby power supply; meanwhile, due to the fact that the main power supply is in power failure, the capacitor C2 and the capacitor C3 discharge through the resistor R2, the diode D4 and the diode D5, the triode Q1 is disconnected, the relay K1 is in power failure, the normally open contact of the relay K1 is disconnected, and the circuit is restored to the initial state.
Claims (6)
1. The utility model provides a dual supply time delay switching circuit for PT gets electricity which characterized in that: the relay K2 comprises a first input end connected with a main power supply through the on-off control module, a second input end connected with a standby power supply, and a group of output ends, wherein a change-over switch of the relay K2 is used for selectively communicating the first input end or the second input end with the output ends;
the alternating current-direct current conversion module is used for converting alternating current output by the main power supply into direct current, and the output end of the alternating current-direct current conversion module is connected with the control end of the on-off control module through the delay circuit.
2. The dual-power-supply time-delay switching circuit for PT power taking as claimed in claim 1, characterized in that: the alternating current-direct current conversion module comprises an RC circuit, a rectifier bridge D1 and a voltage stabilizing circuit, a main power supply is connected to the rectifier bridge D1 through the RC circuit, the voltage stabilizing circuit comprises a voltage stabilizing diode D2 and a voltage stabilizing diode D3 which are connected between two output ends of the rectifier bridge D1 in series, and the forward current conducting direction of the voltage stabilizing diode D2 and the voltage stabilizing diode D3 points to the positive output end of the rectifier bridge D1 from the negative output end of the rectifier bridge D1.
3. The dual-power-supply time-delay switching circuit for PT power taking as claimed in claim 1, characterized in that: the on-off control module comprises a triode Q1 and a relay K1, wherein the triode Q1 is connected with a coil of the relay K1 in series and is used for amplifying a control signal output by the delay circuit and controlling the action of the relay K1.
4. The dual-power-supply time-delay switching circuit for PT power taking as claimed in claim 1, characterized in that: the delay circuit comprises a resistor R2, a resistor R3 and a capacitor C3, wherein the positive output end of the alternating current-direct current conversion module is connected with the output end of the delay circuit through the resistor R2, and the output end of the delay circuit is connected with the negative output end of the alternating current-direct current conversion module through the resistor R3 and the capacitor C3 which are connected in parallel.
5. The dual-power-supply time-delay switching circuit for PT power taking as claimed in claim 4, characterized in that: the time delay circuit further comprises a diode D4 and a diode D5, the diode D4 and the diode D5 are connected in series and then connected with the capacitor C3 in parallel, and the current conducting direction of the diode D4 and the diode D5 is from the output end of the time delay circuit to the negative output end of the alternating current-direct current conversion module.
6. The dual power supply delay switching circuit for PT power taking as claimed in any one of claims 1 to 5, characterized in that: the output of the alternating current-direct current conversion module is a 24V direct current power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023239526.5U CN214205082U (en) | 2020-12-29 | 2020-12-29 | Dual-power delay switching circuit for PT power taking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023239526.5U CN214205082U (en) | 2020-12-29 | 2020-12-29 | Dual-power delay switching circuit for PT power taking |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214205082U true CN214205082U (en) | 2021-09-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023239526.5U Active CN214205082U (en) | 2020-12-29 | 2020-12-29 | Dual-power delay switching circuit for PT power taking |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214205082U (en) |
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2020
- 2020-12-29 CN CN202023239526.5U patent/CN214205082U/en active Active
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