CN110289660B - Power-down control circuit of communication power supply - Google Patents
Power-down control circuit of communication power supply Download PDFInfo
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- CN110289660B CN110289660B CN201910663804.2A CN201910663804A CN110289660B CN 110289660 B CN110289660 B CN 110289660B CN 201910663804 A CN201910663804 A CN 201910663804A CN 110289660 B CN110289660 B CN 110289660B
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 28
- 239000003990 capacitor Substances 0.000 claims description 18
- 229910044991 metal oxide Inorganic materials 0.000 claims description 2
- 150000004706 metal oxides Chemical class 0.000 claims description 2
- 239000004065 semiconductor Substances 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/10—Control circuit supply, e.g. means for supplying power to the control circuit
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to a power-down control circuit of a communication power supply, which comprises a contactor function conversion circuit, a power-down contactor power supply circuit, a power-down control circuit and a power-down contactor KM, wherein one power-down control signal is connected to the power-down contactor power supply circuit, the other power-down control signal is connected to the contactor function conversion circuit, the power-down contactor power supply circuit and the power-down control circuit are respectively and electrically connected with the power-down control circuit, and the power-down control circuit is electrically connected with the power-down contactor KM. The invention inputs one path of power-down control signal output by the external controller to the power-down control circuit, and controls the action of the power-down contactor by matching with the contactor function conversion circuit so as to disconnect the battery from an external load, thereby realizing power-down control of the battery, and inputs the other path of power-down control signal to the power-down contactor power supply circuit, so that the power supply of the power-down contactor is followed when the power-down contactor is in a normally-closed working state and acts, and the safety and reliability of power-down are ensured.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a power-down control circuit of a communication power supply.
Background
The battery protection work for communication is an important link in a communication power supply system, and relates to the normal service life of the whole system, and the battery has high requirements on battery protection by a communication service provider due to the characteristics of high price and inconvenient replacement. When the mains supply is in power failure, the battery discharges the load, and in the prior art, the battery is usually manually cut off when the battery power is exhausted or the battery power is automatically cut off when the battery power is lost, so that the battery is in power shortage due to overlong battery discharging time, and the service life of the battery is greatly influenced. It is therefore necessary to disconnect the battery when the charge of the battery drops to a certain extent to protect the battery.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a power-down control circuit of a communication power supply aiming at the defects of the prior art.
The technical scheme for solving the technical problems is as follows: the utility model provides a communication power supply power down control circuit, includes contactor function conversion circuit, lower electric contactor power supply circuit, power down control circuit and lower electric contactor KM, the electric control signal access under one way contactor function conversion circuit, another way power down control signal access power down contactor power supply circuit, power down electric contactor power supply circuit and power down control circuit respectively with power down control circuit electricity is connected, power down control circuit with power down contactor KM electricity is connected, power down contactor KM electricity is connected between battery and external load.
The beneficial effects of the invention are as follows: the power-down control circuit of the communication power supply is characterized in that one path of power-down control signal output by an external controller is input to the power-down control circuit, the power-down control circuit is matched with the contactor function conversion circuit to control the action of the power-down contactor so as to disconnect a battery from an external load, the power-down control of the battery is realized, the other path of power-down control signal is input to the power-down contactor power supply circuit, the power-down contactor can be supplied with power for follow current when the power-down contactor is in a normally-closed working state and acts, the circuit control is simple, and the power-down control can be realized by adjusting the power-down control signal output by the controller.
Based on the technical scheme, the invention can also be improved as follows:
Further: the power-down control circuit comprises a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a capacitor C3, a diode D4, a diode D5, a MOS (metal oxide semiconductor) transistor Q3, a triode Q4 and a relay RLY1, wherein one path of power-down control signal is connected into the base electrode of the triode Q4 through the resistor R8, the collector electrode of the triode Q4 is electrically connected with the first output end of the contactor function switching circuit, the emitter electrode of the triode Q4 is grounded, the resistor R9 is electrically connected between the emitter electrode of the triode Q4 and the base electrode, the resistor R7 and the resistor R5 are sequentially connected in series between the grid electrode of the MOS transistor Q3 and an external power supply, the resistor R6 and the capacitor C3 are connected in parallel between the common end of the resistor R7 and the resistor R5, the source electrode of the MOS transistor Q3 is grounded, the drain electrode of the MOS transistor Q3 is electrically connected with the third input end of the contactor function switching circuit, the positive electrode of the MOS transistor Q3 is electrically connected with the cathode electrode of the relay RLY 4 is electrically connected with the cathode electrode of the relay 1, the cathode electrode of the relay 1 is electrically connected with the cathode electrode of the relay 1, and the cathode electrode of the relay 1 is electrically connected with the normally-down end of the relay.
The beneficial effects of the above-mentioned further scheme are: the transistor Q4 and the MOS tube Q3 are controlled to be conducted or cut off by a power-off control signal sent by an external controller, and the relay RLY1 can be controlled to be attracted or disconnected by matching with the contactor function conversion circuit, so that the power-off function is completed by controlling the action of the power-off contactor KM, and the diodes D3 and D4 can absorb the reverse electromotive force of the relay RLY1 and the power-off contactor KM.
Further: the contactor function conversion circuit comprises a connection plug JMP1, a connection plug JMP2 and a connection plug JMP3, wherein a No. 1 pin of the connection plug JMP1 is used as a first input end to be electrically connected with the anode of a diode D3, a No. 2 pin of the connection plug JMP1 is used as a first output end to be electrically connected with the collector of a triode Q4, a No. 3 pin of the connection plug JMP1 is used as a second input end to be grounded through a capacitor C3, a No. 1 pin of the connection plug JMP3 is used as a third input end to be electrically connected with the drain electrode of a MOS tube Q3, a No. 2 pin of the connection plug JMP3 is used as a second output end to be electrically connected with the anode of the diode D3, a No. 1 pin of the connection plug JMP2 is used as a fourth input end to be electrically connected with the anode of the diode D5, a No. 2 pin of the connection plug JMP2 is used as a third output end to be electrically connected with the normally closed contact of a relay RLY1, and a No. 3 pin of the connection plug JMP2 is used as a fifth output end to be electrically connected with the power supply circuit.
The beneficial effects of the above-mentioned further scheme are: the electric contactor is driven to act under different working states by adjusting jumper modes of the connecting plug JMP1, the connecting plug JMP2 and the connecting plug JMP3, so that an external battery is disconnected from an external load, and battery power-down control is realized.
Further: the lower electric contactor power supply circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a capacitor C2, a diode D1, a diode D2, a diode ZD1, a triode Q1, a thyristor Q2 and an optocoupler U1, another lower electric control signal is connected into a base electrode of the triode Q1 through the resistor R2, a collector electrode of the triode Q1 is grounded, an emitter electrode of the triode Q1 is electrically connected with a cathode of the optocoupler U1, an anode of the optocoupler U1 is electrically connected with an external power supply through the resistor R1, an emitter electrode of the optocoupler U1 is electrically connected with a gate electrode of the thyristor Q2, the resistor R3 and the capacitor C1 are connected in parallel between the emitter electrode of the optocoupler U1 and a cathode of the thyristor Q2, an anode of the thyristor Q2 is electrically connected with a fifth output end of the contactor function conversion circuit, an emitter electrode of the optocoupler U1 is electrically connected with a cathode of the thyristor Q2, an anode of the optocoupler U1 is electrically connected with a cathode of the thyristor Q2, a cathode of the optocoupler U1 is electrically connected with an anode of the thyristor D1 and a cathode of the thyristor D2 is electrically connected with a cathode of the thyristor D2, and a cathode of the thyristor D1 is electrically connected with an anode of the thyristor D2 is respectively, and a cathode of the thyristor D2 is electrically connected with a cathode of the thyristor.
The beneficial effects of the above-mentioned further scheme are: because the coil instantaneous current is very large when the lower electric contactor is in a normally closed working state and acts, the other path of lower electric control signal output by the external controller is used for isolating and controlling the work of the thyristor Q2 through the photoelectric coupler U1, and the diodes D1 and D2 are used for supplying power to the lower electric contactor KM for freewheeling.
Drawings
FIG. 1 is a block diagram of a communication power supply power-down control circuit of the present invention;
fig. 2 is a circuit diagram of the communication power supply power-down control circuit of the present invention.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
As shown in fig. 1, a power-down control circuit of a communication power supply comprises a contactor function conversion circuit, a power-down contactor power supply circuit, a power-down control circuit and a power-down contactor KM, wherein a power-down control signal 1 is connected to the contactor function conversion circuit, a power-down control signal 2 is connected to the power-down contactor power supply circuit, the power-down contactor power supply circuit and the power-down control circuit are respectively electrically connected with the power-down control circuit, the power-down control circuit is electrically connected with the power-down contactor KM, and the power-down contactor KM is electrically connected between a battery and an external load.
The power-down control circuit of the communication power supply is characterized in that a power-down control signal 1 output by an external controller is input to the power-down control circuit of the power-down electric appliance, and the power-down control circuit is matched with the contactor function conversion circuit to control the action of the power-down contactor so as to disconnect the external power supply from an external load, so that the power-down control of the power supply is realized, the power-down control signal 2 is input to the power-down contactor power supply circuit, the power supply of the power-down contactor is continuously operated when the power-down contactor is in a normally-closed working state and acts, the circuit control is simple, the power-down control can be realized by adjusting the power-down control signal output by the controller, and the power-down safety and reliability are ensured.
As shown in fig. 2, a specific circuit diagram of the power-down control circuit for a communication power supply of the present invention will be described in detail.
In one or more embodiments of the present invention, the power-down control circuit includes a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a capacitor C3, a diode D4, a diode D5, a MOS transistor Q3, a triode Q4, and a relay RLY1, where the power-down control signal 1 is connected to the base of the triode Q4 through the resistor R8, the collector of the triode Q4 is electrically connected to the first output terminal of the contactor function conversion circuit, the emitter of the triode Q4 is grounded, the resistor R9 is electrically connected between the emitter and the base of the triode Q4, the resistor R7 and the resistor R5 are sequentially connected in series between the gate of the MOS transistor Q3 and the external power source, the resistor R6 and the capacitor C3 are connected in parallel between the common terminal of the resistor R7 and the resistor R5 and the ground, the source of the MOS transistor Q3 is grounded, the drain electrode of the MOS transistor Q3 is electrically connected with the third input end of the contactor function conversion circuit, the positive electrode of the diode D3 is electrically connected with the second output end of the contactor function conversion circuit, the negative electrode of the diode D3 is electrically connected with an external power supply, the coil of the relay RLY1 is connected with the diode D3 in parallel, the common contact of the relay RLY1 is electrically connected with the positive electrode of the diode D4, the negative electrode of the diode D4 is electrically connected with one end of the coil of the lower electric contactor KM, the other end of the coil of the lower electric contactor KM is electrically connected with the positive electrode of the diode D4, the normally open contact of the relay RLY1 is idle, the normally closed contact of the relay RLY1 is electrically connected with the third output end of the contactor function conversion circuit, the positive electrode of the diode D5 is electrically connected with the fourth input end of the contactor function conversion circuit, the cathode of the diode D5 is electrically connected with the cathode of the battery.
The transistor Q4 and the MOS tube Q3 are controlled to be conducted or cut off by a power-down control signal 1 sent by an external controller, and the relay RLY1 can be controlled to be attracted or disconnected by matching with the contactor function conversion circuit, so that the action of the power-down contactor KM is controlled, the power-down function is completed, and the diodes D3 and D4 can absorb reverse electromotive force of the relay RLY1 and the power-down contactor KM.
In one or more embodiments of the present invention, the contactor function conversion circuit includes a connection plug JMP1, a connection plug JMP2, and a connection plug JMP3, where pin 1 of the connection plug JMP1 is electrically connected as a first input to the positive electrode of the diode D3, pin 2 of the connection plug JMP1 is electrically connected as a first output to the collector of the triode Q4, pin 3 of the connection plug JMP1 is grounded as a second input through the capacitor C3, pin 1 of the connection plug JMP3 is electrically connected as a third input to the drain electrode of the MOS transistor Q3, pin 2 of the connection plug JMP3 is electrically connected as a second output to the positive electrode of the diode D3, pin 1 of the connection plug JMP2 is electrically connected as a fourth input to the positive electrode of the diode D5, pin 2 of the connection plug JMP2 is electrically connected as a third output to the normally-closed relay RLY1, and pin 2 is electrically connected as a fifth input to the drain electrode of the MOS transistor Q3.
The power-down control device drives the power-down contactor to act in different working states by adjusting jumper modes of the connecting plug JMP1, the connecting plug JMP2 and the connecting plug JMP3, so that an external power supply is disconnected from an external load, and power-down control of the power supply is realized.
In the invention, the lower electric contactor is divided into a normally closed contact and a normally open contact, and is realized by changing a connecting plug JMP1, a connecting plug JMP2 and a connecting plug JMP3 jumper wire in a contactor function conversion circuit, and the method comprises the following specific steps:
Normally closed contact mode: JMP3 short circuit 1, no. 2 pin, JMP1 short circuit 2, no. 3 pin, JMP2 short circuit 2, no. 3 pin, when exchanging the power failure, the battery discharges deeply, when the capacity drops to the power-down threshold, the power-down control signal DO0 that CPU outputs is high level, triode Q4 switches on, MOS pipe Q3 shuts off, the relay RLY1 does not suck, the power-down contactor KM is energized, the power-down disconnects external battery from external load; when the work output of the external power supply is normal during alternating current power-on, the CPU sends out a power-on control signal DO0 to be at a low level, the triode Q4 is cut off, the MOS tube Q3 is conducted, the relay RLY1 is attracted, the power-on contactor KM is disconnected and does not act, and the external load is connected to the external power supply;
Normally open contact mode: pin 1 and pin 2 of JMP3 are not in short circuit, JMP1 is connected with pin 1 and pin 2, JMP2 is connected with pin 1 and pin 2, when alternating current is in power failure, a battery is deeply discharged, when the capacity is reduced to a power-down threshold value, a CPU sends a power-down control signal DO0 to be high level, a triode Q4 is conducted, a MOS tube Q3 is shielded, a relay RLY1 is attracted, a power-down contactor KM is disconnected and is not operated, and an external power supply is disconnected from a load; when the work output of the external power supply is normal during alternating current power-on, the CPU sends out a power-on control signal DO0 to be at a low level, the triode Q4 is cut off, the MOS tube Q3 is shielded, the relay RLY1 is not attracted, the power-on contactor KM is electrified to operate, and the external load is connected to the external power supply.
In one or more embodiments of the present invention, the lower electrical contactor power supply circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a capacitor C2, a diode D1, a diode D2, a diode ZD1, a transistor Q1, a thyristor Q2, and an optocoupler U1, wherein a lower electrical control signal 2 is connected to a base of the transistor Q1 through the resistor R2, a collector of the transistor Q1 is grounded, an emitter of the transistor Q1 is electrically connected to a cathode of the optocoupler U1, an anode of the optocoupler U1 is electrically connected to an external power supply through the resistor R1, an emitter of the optocoupler U1 is electrically connected to a gate of the thyristor Q2, the resistor R3 and the capacitor C1 are connected in parallel between an emitter of the optocoupler U1 and a cathode of the thyristor Q2, an anode of the thyristor Q2 is electrically connected to a fifth output of the contactor function conversion circuit, an emitter of the optocoupler Q1 is electrically connected to a collector of the thyristor Q2, an anode of the thyristor is connected to a cathode of the thyristor Q2 and a cathode of the thyristor D2 are respectively connected to a cathode of the thyristor D2, and a cathode of the optocoupler Q2 is electrically connected to an anode of the thyristor D2.
Because the coil instantaneous current is very large when the lower electric contactor KM is in a normally closed working state and acts, a lower electric control signal 2 output by an external controller is isolated and controlled by a photoelectric coupler U1 to work by a thyristor Q2, and a circulation loop is sequentially formed by the lower electric contactor KM line bud, a connecting plug JMP2, the thyristor Q2, a diode D1, a diode D2 and a battery cathode, so that power supply and follow current are supplied to the lower electric contactor KM line bud. When the battery is not powered down, the cathode of the diode D1 and the cathode of the diode D2 are respectively electrically connected with the battery and the cathode of an external power supply, and the cathode of the diode D1 and the cathode of the diode D2 can be regarded as being mutually conducted; when the battery is powered down, the cathode of the diode D1 and the cathode of the diode D2 are disconnected from the battery and the cathode of the external power supply, respectively, and the cathode of the diode D1 and the cathode of the diode D2 are also disconnected from each other.
According to the power-down control circuit of the communication power supply, the power-down control signal output by the external controller is output through the conversion of the contactor function conversion circuit and the power supply circuit, and then the power-down control circuit sends out the signal to control the action of the power-down contactor to complete the power-down function, so that the battery is reliably powered down, the technical index requirement of the power-down control circuit of the communication power supply specified by the state is met, and the power-down control circuit is applied to an actual circuit of the communication power supply.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (1)
1. The power-down control circuit of the communication power supply is characterized by comprising a contactor function conversion circuit, a power-down contactor power supply circuit, a power-down control circuit and a power-down contactor KM, wherein one power-down control signal is connected to the contactor function conversion circuit, the other power-down control signal is connected to the power-down contactor power supply circuit, the power-down contactor power supply circuit and the contactor function conversion circuit are respectively and electrically connected with the power-down control circuit, the power-down control circuit is electrically connected with the power-down contactor KM, and the power-down contactor KM is electrically connected between a battery and an external load;
The power-down control circuit comprises a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a capacitor C3, a diode D4, a diode D5, a MOS (metal oxide semiconductor) transistor Q3, a triode Q4 and a relay RLY1, wherein one path of power-down control signal is connected to the base electrode of the triode Q4 through the resistor R8, the collector electrode of the triode Q4 is electrically connected with the first output end of the contactor function switching circuit, the emitter electrode of the triode Q4 is grounded, the resistor R9 is electrically connected between the emitter electrode of the triode Q4 and the base electrode, the resistor R7 and the resistor R5 are sequentially connected in series between the grid electrode of the MOS transistor Q3 and an external power supply, the resistor R6 and the capacitor C3 are connected in parallel between the common end of the resistor R7 and the resistor R5, the source electrode of the MOS transistor Q3 is grounded, the drain electrode of the MOS transistor Q3 is electrically connected with the third input end of the contactor function switching circuit, the positive electrode of the MOS transistor Q3 is electrically connected with the third input end of the contactor function switching circuit, the negative electrode of the RLY 4 is electrically connected with the cathode electrode of the relay RLY 4, the positive electrode of the relay is electrically connected with the cathode electrode of the relay 1 is electrically connected with the cathode electrode of the relay RLY 4, the normally-down end of the normally-off end of the contactor, and the normally-off end of the normally-off relay is electrically connected with the normally-down end of the relay RLY 3 is electrically connected with the normally-down end of the relay;
The contactor function conversion circuit comprises a connection plug JMP1, a connection plug JMP2 and a connection plug JMP3, wherein a No. 1 pin of the connection plug JMP1 is used as a first input end to be electrically connected with the anode of a diode D3, a No. 2 pin of the connection plug JMP1 is used as a first output end to be electrically connected with the collector of a triode Q4, a No. 3 pin of the connection plug JMP1 is used as a second input end to be grounded through a capacitor C3, a No. 1 pin of the connection plug JMP3 is used as a third input end to be electrically connected with the drain electrode of a MOS tube Q3, a No. 2 pin of the connection plug JMP3 is used as a second output end to be electrically connected with the anode of the diode D3, a No. 1 pin of the connection plug JMP2 is used as a fourth input end to be electrically connected with the anode of the diode D5, a No. 2 pin of the connection plug JMP2 is used as a third output end to be electrically connected with the normally closed contact of a relay RLY1, and a No. 3 pin of the connection plug JMP2 is used as a fifth output end to be electrically connected with the power supply circuit;
The lower electric contactor power supply circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a capacitor C2, a diode D1, a diode D2, a diode ZD1, a triode Q1, a thyristor Q2 and an optocoupler U1, wherein another lower electric control signal is connected into a base electrode of the triode Q1 through the resistor R2, a collector electrode of the triode Q1 is grounded, an emitter electrode of the triode Q1 is electrically connected with a cathode of the optocoupler U1, an anode electrode of the optocoupler U1 is electrically connected with an external power supply through the resistor R1, an emitter electrode of the optocoupler U1 is electrically connected with a gate electrode of the thyristor Q2, the resistor R3 and the capacitor C1 are connected in parallel between the emitter electrode of the optocoupler U1 and a cathode of the thyristor Q2, an anode of the thyristor Q2 is electrically connected with a fifth output end of the contactor function conversion circuit, an emitter electrode of the optocoupler Q1 is electrically connected with a cathode of the thyristor Q2, an anode of the optocoupler U1 is electrically connected with a cathode of the thyristor Q2, a cathode of the optocoupler D1 is electrically connected with a cathode of the thyristor D2, and a cathode of the diode D2 is respectively connected with an anode of the thyristor D1;
The lower electric contactor is in a normally closed working state, coil instantaneous current is large when the lower electric contactor acts, another path of lower electric control signal output by the external controller is isolated through an optocoupler U1 to control a thyristor Q2 to work, and the lower electric contactor KM is powered and freewheeled through diodes D1 and D2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910663804.2A CN110289660B (en) | 2019-07-23 | 2019-07-23 | Power-down control circuit of communication power supply |
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| CN201910663804.2A CN110289660B (en) | 2019-07-23 | 2019-07-23 | Power-down control circuit of communication power supply |
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| CN110289660A CN110289660A (en) | 2019-09-27 |
| CN110289660B true CN110289660B (en) | 2024-04-26 |
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| CN112947189B (en) * | 2021-02-07 | 2022-09-09 | 武汉麦格米特电气有限公司 | Multi-path power-on/power-off control circuit and communication power supply system |
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| CN110289660A (en) | 2019-09-27 |
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