CN212162912U - Back-up power supply input self-starting control circuit suitable for power distribution terminal power supply - Google Patents
Back-up power supply input self-starting control circuit suitable for power distribution terminal power supply Download PDFInfo
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- CN212162912U CN212162912U CN202020692864.5U CN202020692864U CN212162912U CN 212162912 U CN212162912 U CN 212162912U CN 202020692864 U CN202020692864 U CN 202020692864U CN 212162912 U CN212162912 U CN 212162912U
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Abstract
The utility model discloses a back-up power supply drops into self-starting control circuit suitable for distribution terminal power, under this circuit, give the control circuit power supply through automatic start discharge circuit when the battery inserts, when being applied to the rechargeable switching power supply of three distant FTU batteries at distribution automation telemechanical terminal, when the rechargeable switching power supply site-installation of bell-type FTU battery of 10KV column switch configuration, because the particularity of structure leads unable manual operation start battery power supply, adopt self-starting control circuit can be the equipment power supply when the battery inserts this moment, turn-off the battery again and discharge when the battery discharges to putting the protective voltage.
Description
Technical Field
The utility model relates to a self-starting control field, more specifically say, relate to a reserve power supply drops into self-starting control circuit suitable for distribution terminal power.
Background
Distribution automation telemechanical terminal cover type FTU obtains extensive application in 10KV circuit because of appearance simple structure, material are light, water-proof effects is good, and the supporting FTU terminal of domestic 10KV post switch is mostly the cover type structure at present.
Due to the small and exquisite appearance structure of the cover type FTU, the number of connecting wires and the number of aviation plugs are necessarily reduced properly, and the starting and stopping power supply keys of the battery are not installed on the cover type FTU operating panel due to a series of reasons. The bell-type FTU of field installation all assembles, the screw is not detachable, because there is not power supply during outdoor construction, the various functions of device can't ally oneself with the accent, at this moment just need start supporting reserve battery and supply power, because the device does not install the battery and starts the button, the battery just also can't manual start power supply, it is very necessary design just to adopt the automatic power supply that drops into of battery that the self-starting control circuit made the access this moment, satisfy field construction personnel's power supply problem that can be fine through this design.
At present, the battery directly supplies power to the battery by using a special control circuit, and the control circuit can be electrified to work after the battery is connected, so that the aim of controlling the discharge of the battery is fulfilled. The scheme needs to consume a large amount of electric quantity of the battery all the time, if the battery is idle for a long time after being connected with the device, the electric quantity of the battery can be consumed by the control circuit, and the situation that the battery is insufficient when the device is required to be installed and debugged can be found.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, can't drop into the defect that the power supply volume carries out automated control to the battery is automatic to prior art design, provide a back-up source who is applicable to distribution terminal power and drop into self-starting control circuit.
The utility model provides a technical scheme that its technical problem adopted is: constructing a backup power supply throw self-starting control circuit suitable for a power distribution terminal power supply, the circuit comprising a control circuit and a discharge circuit, wherein:
in the control circuit, the second diode D2 is connected to the fourth resistor R4, and the other end of the resistor R4 is connected to the fifth resistor R5; the other end of the resistor R4 is also connected to pin 1 of a first voltage reference U1; pin 2 of the first voltage reference U1 is connected to pin 2 of the first optocoupler U2, and pin 3 of the first voltage reference U1 is connected to the resistor R5; pin 1 of the first optocoupler U2 is connected to a third resistor R3, and the other end of the resistor R3 is connected to a resistor R4;
after the battery is connected, the voltage is divided by a diode D2, a resistor R4 and a resistor R5; when the voltage on the resistor R5 reaches 2.5V, pins 2 and 3 of a first voltage reference U1 are conducted, so that a first optocoupler U2 is conducted after current limitation by a resistor R3;
in the discharge circuit, a pin 3 of a first optical coupler U2 is respectively connected to an eighth resistor R8 and a pin 1 of a power MOS tube Q2 through a seventh resistor R7; pin 4 of the optocoupler U2 is connected to the positive power supply voltage terminal of the discharge circuit; the other end of the resistor R8 is connected to pin 3 of the power MOS tube Q2, and pin 2 of the power MOS tube Q2 is connected to the negative end of the power supply voltage of the discharge circuit;
after a first optical coupler U2 in the control circuit is conducted, resistors R7 and R8 in the discharge circuit and a power MOS tube Q2 are supplied with power through pins 3 and 4 of the first optical coupler U2, and after a power MOS tube Q2 is conducted, power is supplied to an output by a battery.
A back-up source suitable for distribution terminal power drops into self-starting control circuit in, simple and the electric quantity consumption of circuit through adopting devices such as triode, opto-coupler, voltage reference source, resistance, electric capacity, diode to constitute is less than the control circuit of battery self discharge loss, reaches the function that realizes the automatic power supply that drops into of battery.
Implement the utility model discloses a back-up source drops into self-starting control circuit suitable for distribution terminal power for control circuit cost is very low, circuit structure is also very simple and easy, and power consumption is less than the self-discharge electric quantity of battery, suitable large tracts of land is promoted and is used.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
FIG. 1 is a circuit diagram of a self-starting control circuit;
fig. 2 is a system configuration diagram of the self-starting control circuit.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example 1:
please refer to fig. 1-2, which are a circuit diagram of the self-starting control circuit and a system structure diagram of the self-starting control circuit, respectively; from fig. 2, the utility model discloses a system architecture that is applicable to back-up power supply of distribution terminal power and drops into self-starting control circuit comprises 3 parts: the circuit diagram of each part is as follows, referring to fig. 1, the battery 1, the control circuit 2 and the discharge circuit 3 are connected in sequence, and it can be seen from fig. 1 that:
in the control circuit 2, the second diode D2 is connected to the fourth resistor R4, and the other end of the resistor R4 is connected to the fifth resistor R5; the other end of the resistor R4 is also connected to pin 1 of a first voltage reference U1; pin 2 of the first voltage reference U1 is connected to pin 2 of the first optocoupler U2, and pin 3 of the first voltage reference U1 is connected to the resistor R5; pin 1 of the first optocoupler U2 is connected to a third resistor R3, and the other end of the resistor R3 is connected to a resistor R4;
under the connection action of the above elements, after the battery 1 is connected to the control circuit 2, the voltage can be divided by the diode D2 and the resistors R4 and R5; when the voltage on the resistor R5 reaches 2.5V, pins 2 and 3 of the first voltage reference U1 are conducted, so that the first optocoupler U2 is conducted after current limitation by the resistor R3;
in the discharge circuit 3, a pin 3 of a first optical coupler U2 is respectively connected to an eighth resistor R8 and a pin 1 of a power MOS tube Q2 through a seventh resistor R7, and a pin 4 of an optical coupler U2 is connected to a positive power supply voltage end of the discharge circuit; the other end of the resistor R8 is connected to pin 3 of the power MOS tube Q2, and pin 2 of the power MOS tube Q2 is connected to the negative end of the power supply voltage of the discharge circuit;
under the connection action of the above elements, after the first optical coupler U2 in the control circuit is turned on after being subjected to current limiting through the resistor R3, the resistors R7 and R8 in the discharge circuit and the power MOS transistor Q2 are supplied with power through pins 3 and 4 of the first optical coupler U2, and after the power MOS transistor Q2 is turned on, the output is supplied with power through the battery.
The above is the working process of supplying power to the control circuit 2 by automatically starting the discharging circuit 3 when the battery 1 is connected.
Still include second opto-coupler U3 in discharge circuit 3, connect through the corresponding pin between with first opto-coupler U2 and the second opto-coupler U3, it is specific:
In the discharge circuit 3, pin 1 of the second optocoupler U3 is connected to pin 7 of a comparator U4B through a ninth resistor R9, pin 5 of the comparator U4B is connected to an eleventh resistor R11 and a twelfth resistor R12 respectively, wherein the other end of the resistor R11 is connected to the positive terminal of the power supply voltage, and the other end of the resistor R12 is connected to the negative terminal of the power supply voltage;
thus, under the connection action of the above elements, after the output is powered by the battery 1, and the output is powered, the voltage is divided by the resistors R11 and R12, so that the divided voltage on the resistor R12 is higher than the REF reference voltage (the function of the reference voltage is to provide an accurate reference voltage value), thereby enabling the comparator U4B to output a high level, and after the current is limited by the resistor R9, the optocoupler U3 is turned on, and the on state of the power MOS transistor Q2 is maintained.
In this way, after the output is powered, the comparator U4B outputs a high level, and the on-state of the power MOS transistor Q2 is further maintained by turning on the optocoupler U3.
However, when the battery is discharged to the over-discharge protection voltage, it is also necessary to turn off the battery discharge, i.e. stop the battery discharge, so as to avoid the over-discharge of the battery, wherein in the self-starting circuit disclosed in the present embodiment, the above technical effects are achieved by the following embodiments:
in the control circuit 2, the second diode D2 is connected to the first resistor R1 through the first diode D1, and the other end of the resistor R1 is connected to the first capacitor C1 and the pin 1 of the first triode Q1; the other end of the capacitor C1 is connected to pin 2 of the transistor Q1, and pin 3 of the transistor Q1 is connected to pin 1 of the first voltage reference U1;
at the moment, the voltage charges the capacitor C1 through the diode D1 and the resistor R1, and when the voltage on the capacitor C1 reaches [0.5V, 0.7V ], the triode Q1 is conducted;
in the control circuit 2, a pin 1 of a first triode Q1 is connected to a second resistor R2, the other end of a resistor R2 is connected to a first capacitor C1, and at this time, when voltage charges a capacitor C1 through a resistor R1, a resistor R2 performs a shunting function; when the voltage of the capacitor C1 reaches 0.5V, 0.7V and the triode Q1 is conducted, after the triode Q1 is conducted, the voltage of a pin 1 of the voltage reference U1 can be reduced, so that pins 2 and 3 of the U1 are closed when the voltage of the reference pin is lower than the reference voltage, at the moment, the optocoupler U2 also stops conducting, and the conduction of the power MOS tube Q2 maintains the discharge of the battery by the conduction of the optocoupler U3; therefore, the delay conducting time of the triode Q1 is adjusted by setting parameters of the resistor R1, the capacitor C1 and the resistor R2, and the situation that the power MOS tube Q2 is always in a conducting state after the circuit is started and the battery cannot be turned off during under-voltage protection of the battery is avoided.
Because the conduction of the transistor Q1 only needs small current, the power consumption of the self-starting power supply circuit is negligible; when the battery discharge voltage is lower than the battery protection voltage, the divided voltage of the resistor R12 is lower than the REF reference voltage, at this time, pin 5 of the comparator U4B is connected to the power MOS tube Q2 through a resistor R12, and pin 7 of the comparator U4B is connected to the optical coupler U3 through a resistor R9, wherein the comparator U4B outputs a low level to turn off the optical coupler U3 and the power MOS tube Q2, so that the battery stops discharging, and the excessive discharging of the battery is avoided.
Example 2:
the present embodiment provides another way to turn off the battery based on embodiment 1, specifically:
in the present embodiment, it is considered that in the control circuit 2, pin 1 of the first voltage reference U1 is connected to the sixth resistor R6, and the other end of the resistor R6 is connected to pin 1 of the first optocoupler U2 and the third resistor R3 respectively; wherein, resistance R6 is shunt resistor, like this under shunt resistor R6's effect, can prevent that voltage reference U1's static leakage current from passing through opto-coupler U2 for opto-coupler U2 is because of the mistake switches on and when unable normal undervoltage, cuts off the battery.
Example 3:
in this embodiment, based on embodiment 1 or embodiment 2, in order to avoid a certain back difference between the off-state voltage and the off-state voltage after the battery is turned off, the following embodiments are provided:
currently, in order to avoid the voltage rise and the re-discharge due to the absence of the discharge load after the battery is turned off, in the discharge circuit, pin 5 of the comparator U4B is connected to the tenth resistor R10, and the other end of the resistor R10 is connected to the resistor R9; the resistor R10 is an under-voltage turn-off hysteresis resistor, and the turn-off voltage can have a certain return difference by adjusting the resistor R10.
Through the explanation to fig. 1-2, the utility model discloses a get a reserve power supply suitable for distribution terminal power and drop into self-starting control circuit, through adopting the triode, the opto-coupler, voltage reference source, resistance, electric capacity, the circuit that devices such as diode constitute for switch on the back after first opto-coupler U2 among the control circuit is through resistance R3 current-limiting, give resistance R7, R8 and power MOS pipe Q2 power supply among the discharge circuit through first opto-coupler U2, and, after power MOS pipe Q2 switches on, give output power supply by the battery; after the output is electrified, the comparator U4B outputs high level to turn on the optical coupler U3, so that the on state of the power MOS transistor Q2 is further maintained. However, when the battery discharge needs to be turned off, the battery discharge is stopped by judging whether the divided voltage on the resistor R12 is smaller than the REF reference voltage, and if so, outputting a low level through the comparator U4B to turn off the optocoupler U3 and the power MOS transistor Q2, thereby avoiding the excessive battery over-current.
The embodiment discloses a backup power supply input self-starting control circuit suitable for a power distribution terminal power supply, and the working process is as follows:
firstly, after the battery is connected, voltage is divided through a diode D2, a resistor R4 and a resistor R5, when the voltage on the resistor R5 reaches 2.5V, pins 2 and 3 of a voltage reference U1 are conducted, and therefore the optocoupler U2 is conducted after current limitation through the resistor R3;
then, after the optical coupler U2 is switched on, voltage supplies power to the resistor R7, the resistor R8 and the power MOS tube Q2 through 3 and 4 pins of the optical coupler U2, and after the power MOS tube Q2 is switched on, power is supplied to output by a battery;
then, when the output is electrified, the voltage of the resistor R11 and the resistor R12 is divided to enable the voltage of the resistor R12 to be higher than the REF reference voltage, so that the comparator U4 outputs a high level, the current of the resistor R9 is limited, the optocoupler U3 is conducted, and when the optocoupler U3 is conducted, the power MOS transistor Q2 continues to be in a conducting state;
then, in a state that the power MOS transistor Q2 continues to be kept on, the voltage charges the capacitor C1 through the diode D1 and the resistor R1, when the voltage on the capacitor C1 reaches [0.5V, 0.7V ], the transistor Q1 is turned on, however, the reference voltage of the reference source U1 is pulled down after the transistor Q1 is turned on; at present, when the voltage value of the 1 pin of the reference source U1 is lower than 2.5V, the earlier conducted 2 and 3 pins will stop conducting, at this time, the optocoupler U2 will also stop conducting, and the conduction of the power MOS transistor Q2 will maintain the discharge of the battery by the conduction of the optocoupler U3;
finally, as the transistor Q1 only needs small current to be conducted, the power consumption of the self-starting power supply circuit can be ignored; when the discharge voltage of the battery is lower than the battery protection voltage, the divided voltage of the resistor R12 is smaller than the REF reference voltage, and at the moment, the comparator U4 outputs a low level to turn off the optocoupler U3 and the power MOS transistor Q2, so that the battery stops discharging to avoid overdischarging of the battery.
However, when the battery is turned off, the battery can also be turned off through the shunt resistor R6, so that under the action of the shunt resistor R6, the static leakage current of the voltage reference U1 can be prevented from passing through the optocoupler U2, and the optocoupler U2 cannot normally undervoltage due to misconduction to turn off the battery.
In order to avoid the above-mentioned operation process, after the battery is turned off, the voltage rises due to the absence of the discharging load and is discharged again in the discharging circuit, it is considered that the turning-off voltage has a certain return difference by adjusting the resistor R10.
The utility model discloses a back-up source drops into self-starting control circuit suitable for distribution terminal power for control circuit cost is very low, circuit structure is also very simple and easy, and power consumption is less than the self-discharge electric quantity of battery, and suitable large tracts of land is promoted and is used.
While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (6)
1. A backup power supply switching self-starting control circuit suitable for a power distribution terminal power supply is characterized by comprising a control circuit and a discharge circuit, wherein:
in the control circuit, the second diode D2 is connected to the fourth resistor R4, and the other end of the resistor R4 is connected to the fifth resistor R5; the other end of the resistor R4 is also connected to pin 1 of a first voltage reference U1; pin 2 of the first voltage reference U1 is connected to pin 2 of the first optocoupler U2, and pin 3 of the first voltage reference U1 is connected to the resistor R5; pin 1 of the first optocoupler U2 is connected to a third resistor R3, and the other end of the resistor R3 is connected to a resistor R4;
after the battery is connected, the voltage is divided by a diode D2, a resistor R4 and a resistor R5; when the voltage on the resistor R5 reaches 2.5V, pins 2 and 3 of a first voltage reference U1 are conducted, so that a first optocoupler U2 is conducted after current limitation by a resistor R3;
in the discharge circuit, a pin 3 of a first optical coupler U2 is respectively connected to an eighth resistor R8 and a pin 1 of a power MOS tube Q2 through a seventh resistor R7; pin 4 of the optocoupler U2 is connected to the positive power supply voltage terminal of the discharge circuit; the other end of the resistor R8 is connected to pin 3 of the power MOS tube Q2, and pin 2 of the power MOS tube Q2 is connected to the negative end of the power supply voltage of the discharge circuit;
after a first optical coupler U2 in the control circuit is conducted, resistors R7 and R8 in the discharge circuit and a power MOS tube Q2 are supplied with power through pins 3 and 4 of the first optical coupler U2, and after a power MOS tube Q2 is conducted, power is supplied to an output by a battery.
2. The circuit of claim 1, further comprising a second optocoupler U3, wherein:
a pin 3 of the first optocoupler U2 is connected to a pin 3 of the second optocoupler U3, and a pin 4 of the first optocoupler U2 is connected to a pin 4 of the second optocoupler U3;
in the discharge circuit, a pin 1 of a second optocoupler U3 is connected to a pin 7 of a comparator U4B through a ninth resistor R9, a pin 5 of the comparator U4B is respectively connected to an eleventh resistor R11 and a twelfth resistor R12, wherein the other end of the resistor R11 is connected to the positive terminal of the power supply voltage, and the other end of the resistor R12 is connected to the negative terminal of the power supply voltage;
after the output is electrified, the voltage is divided through the resistor R11 and the resistor R12, so that the divided voltage on the resistor R12 is higher than the reference voltage, the comparator U4B outputs a high level, the current is limited through the resistor R9, the optocoupler U3 is conducted, and the conducting state of the power MOS transistor Q2 is maintained.
3. The power supply back-up power supply throw self-starting control circuit for the power distribution terminal power supply as claimed in claim 2, wherein in the control circuit, the second diode D2 is connected to the first resistor R1 through the first diode D1, and the other end of the resistor R1 is connected to the first capacitor C1 and pin 1 of the first transistor Q1; the other terminal of capacitor C1 is connected to pin 2 of transistor Q1, and pin 3 of transistor Q1 is connected to pin 1 of first voltage reference U1.
4. The circuit of claim 3, wherein the pin 1 of the first transistor Q1 is connected to a second resistor R2, and the other end of the resistor R2 is connected to a first capacitor C1.
5. The circuit of claim 2, wherein pin 1 of the first voltage reference U1 is connected to a sixth resistor R6, and the other end of the resistor R6 is connected to pin 1 of the first optocoupler U2 and the third resistor R3 respectively.
6. A backup power supply self-starting control circuit suitable for a power distribution terminal power supply according to claim 4 or 5, characterized in that in the discharging circuit, pin 5 of the comparator U4B is connected to a tenth resistor R10, and the other end of the resistor R10 is connected to a resistor R9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020692864.5U CN212162912U (en) | 2020-04-29 | 2020-04-29 | Back-up power supply input self-starting control circuit suitable for power distribution terminal power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020692864.5U CN212162912U (en) | 2020-04-29 | 2020-04-29 | Back-up power supply input self-starting control circuit suitable for power distribution terminal power supply |
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| Publication Number | Publication Date |
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| CN212162912U true CN212162912U (en) | 2020-12-15 |
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| CN202020692864.5U Expired - Fee Related CN212162912U (en) | 2020-04-29 | 2020-04-29 | Back-up power supply input self-starting control circuit suitable for power distribution terminal power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112671087A (en) * | 2020-12-18 | 2021-04-16 | 国家电网有限公司 | Power transmission line on-line monitoring power supply system |
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2020
- 2020-04-29 CN CN202020692864.5U patent/CN212162912U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112671087A (en) * | 2020-12-18 | 2021-04-16 | 国家电网有限公司 | Power transmission line on-line monitoring power supply system |
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