CN111785569B - Soft-start relay control circuit and charging circuit - Google Patents

Abstract

The invention discloses a soft-start relay control circuit and a charging circuit, comprising: a first connection end, a second connection end, a pre-conduction circuit, a delay circuit and a relay; one end of the pre-conduction circuit is connected to the first connection end The other end of the pre-conduction circuit is connected to the second connection end; one end of the switch side of the relay is connected to the first connection end, and the other end of the switch side of the relay is connected to the second connection end; the present invention By connecting the relay control circuit between the DC load and the power supply terminal of the charging circuit, the current is buffered by the pre-conduction circuit, and the DC load is charged by the delay circuit. When the voltage of the delay circuit reaches the set voltage, the relay When the coil is energized, the open contact is usually closed, and the current is completely applied to the DC load to achieve the effect of buffering soft start, making the current more stable, protecting the DC load, and simple and practical.

Description

A soft-start relay control circuit and charging circuit

technical field

The invention relates to the technical field of charging control, in particular to a soft-start relay control circuit and a charging circuit.

Background technique

In the rapid development of energy storage technology, it is often necessary to charge the battery pack. When the generator set generates electricity, it is converted to DC through the rectifier cabinet, and then the DC is added to both ends of the battery pack to charge and store energy. When the DC load is an energy storage battery pack, the output of the rectifier cabinet is directly connected to both ends of the battery pack, and there will be a large current impact and damage the battery pack.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a soft-start relay control circuit and a charging circuit, so as to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

The purpose of the present invention is achieved by the following technical solutions: a soft-start relay control circuit, comprising: a first connection end, a second connection end, a pre-conduction circuit, a delay circuit and a relay; one end of the pre-conduction circuit connected to the first connection end, the other end of the pre-conduction circuit is connected to the second connection end; one end of the switch side of the relay is connected to the first connection end, and the other end of the switch side of the relay is connected to the second connection end connection; the pre-conduction circuit is used to generate a level signal that triggers the delay circuit, and the delay circuit responds to the level signal and delays the closing of the switch side of the control relay to conduct the first connection end and the second connection end.

By connecting the relay control circuit between the DC load and the power supply terminal, the current at the power supply terminal is buffered by resistance through the pre-conduction circuit, and the DC load is charged in a delayed manner through the delay circuit. When the voltage of the delay circuit reaches the set voltage, the relay When the coil is energized, the open contact is usually closed, and the current is completely applied to the DC load, which achieves the effect of buffering soft start, makes the current more stable, protects the DC load, and is simple and practical.

As a further improvement of the above technical solution, the pre-conduction circuit includes a first resistor, a seventh resistor and a first capacitor; the upper end of the first resistor is connected to the positive electrode of the power supply, and the lower end of the first resistor is connected to the first resistor respectively. The upper end of the seventh resistor is connected to the upper end of the first capacitor, and the lower end of the first capacitor is respectively connected to the delay circuit and the negative pole of the power supply; the lower end of the seventh resistor is connected to the delay circuit. Realize resistive buffering of current.

As a further improvement of the above technical solution, the delay circuit includes: a photocoupler, a first diode, a second capacitor, an eighth resistor, a ninth resistor, a tenth resistor, a first comparator, and an eleventh resistor , 12th resistor, 13th resistor, 14th resistor, 15th resistor, electrolytic capacitor, 2nd diode, 2nd comparator, 18th resistor, 5th diode, 17th resistor and MOS tube; the first input end of the photocoupler is respectively connected to the cathode of the first diode and the pre-conduction circuit, and the second input end of the photocoupler is respectively connected to the first and second The anode of the electrode tube and the pre-conduction circuit, the first output end of the photocoupler is respectively connected to the first input end of the first comparator and the lower end of the tenth resistor, and the The second output terminal is connected to the ground terminal; the second input terminal of the first comparator is respectively connected to the upper end of the eleventh resistor and the upper end of the twelfth resistor, and the lower end of the eleventh resistor is connected to the power supply terminal, so The lower end of the twelfth resistor is connected to the ground terminal; the upper end of the tenth resistor is respectively connected to the lower end of the eighth resistor, the lower end of the ninth resistor and the lower end of the second capacitor. The upper end is connected to the power supply end, the upper end of the ninth resistor and the upper end of the second capacitor are connected to the ground end; the output end of the first comparator is connected to the left end of the thirteenth resistor, and the upper end of the thirteenth resistor is connected to the ground. The right end is respectively connected to the second input end of the second comparator, the anode of the second diode, the lower end of the fourteenth resistor, the upper end of the fifteenth resistor and the anode of the electrolytic capacitor, The cathode of the electrolytic capacitor and the lower end of the fifteenth resistor are connected to the ground terminal, the cathode of the second diode and the upper end of the fourteenth resistor are connected to the power supply terminal; the first end of the second comparator The input terminal is connected to the power supply terminal, and the output terminal of the second comparator is respectively connected to the lower end of the eighteenth resistor, the cathode of the fifth diode, the upper end of the seventeenth resistor and the MOS tube. gate, the upper end of the eighteenth resistor is connected to the power supply terminal, the source of the MOS tube, the anode of the fifth diode and the lower end of the seventeenth resistor are connected to the ground terminal; The drain is connected to the relay. Realize delayed charging.

As a further improvement of the above technical solution, it also includes: a third diode, a fourth diode and a sixteenth resistor; the upper ends of the sixteenth resistor are respectively connected to the negative electrode of the third diode, the The upper end of the relay and the power supply end; the lower end of the sixteenth resistor is connected to the anode of the fourth diode, and the cathode of the fourth diode is respectively connected to the anode of the third diode and the relay the lower end. Realize the protection of the relay.

As a further improvement of the above technical solution, the model of the first comparator and the second comparator is LM393.

As a further improvement of the above technical solution, the type of the MOS tube is 50N06.

As a further improvement of the above technical solution, the model of the optocoupler is TLP521-1.

A soft-start charging circuit, comprising: a rectifier circuit, an inductor, a third capacitor, a fuse, a DC load and the above-mentioned relay control circuit; the upper end of the rectifier circuit is connected to the left end of the inductor, and the upper end of the rectifier circuit is connected to the left end of the inductor. The lower end is respectively connected to the lower end of the third capacitor and the DC load; the right end of the inductance is connected to the upper end of the third capacitor and the left end of the fuse, and the right end of the fuse is connected to the first end of the relay control circuit A connection end, the second connection end of the relay control circuit is connected to the DC load.

As a further improvement of the above technical solution, the rectifier circuit includes a sixth diode, a seventh diode, an eighth diode, a ninth diode, a tenth diode and an eleventh diode; The anode of the sixth diode, the anode of the seventh diode, the anode of the eighth diode, the cathode of the ninth diode, the cathode of the tenth diode and The cathode of the eleventh diode is respectively connected to the AC power supply terminal; the cathode of the sixth diode is connected to the cathode of the seventh diode, the cathode of the eighth diode and the inductance Left end; the anode of the ninth diode is connected to the anode of the tenth diode, the anode of the eleventh diode and the lower end of the third capacitor. Convert alternating current to direct current.

The beneficial effects of the present invention are as follows: by connecting a relay control circuit between the DC load and the power supply terminal of the charging circuit, the current is buffered by resistance through the pre-conduction circuit, and the DC load is charged in a delayed manner through the delay circuit, when the voltage of the delay circuit is delayed. When the set voltage is reached, the relay coil is energized and the normally open contact is closed, and the current is fully applied to the DC load to achieve the effect of buffering soft start, making the current more stable, protecting the DC load, and simple and practical.

Additional aspects and advantages of the present invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:

1 is a schematic diagram of a relay control circuit of a soft-start relay control circuit and a charging circuit provided by the present invention;

2 is a schematic diagram of a charging circuit of a soft-start relay control circuit and a charging circuit provided by the present invention;

The coordinate arrows in FIG. 1 represent up, down, left and right, respectively.

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, only used to explain the present invention, and should not be construed as a limitation of the present invention.

In the description of the present invention, it should be understood that the orientations related to the description, such as up, down, front, rear, left, right, etc., are based on the orientation or positional relationship shown in the drawings, and are only In order to facilitate the description of the present invention and simplify the description, it is not indicated or implied that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

In the description of the present invention, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including this number, above, below, within, etc. are understood as including this number. If it is described that the first and the second are only for the purpose of distinguishing technical features, it cannot be understood as indicating or implying relative importance, or indicating the number of the indicated technical features or the order of the indicated technical features. relation.

In the description of the present invention, unless otherwise clearly defined, words such as setting, installation, connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present invention in combination with the specific content of the technical solution.

Embodiment 1, referring to FIG. 1 , a soft-start relay control circuit includes: a first connection end, a second connection end, a pre-conduction circuit 110 , a delay circuit 120 and a relay 130 ; the pre-conduction circuit 110 One end of the relay 130 is connected to the first connection end, the other end of the pre-conduction circuit 110 is connected to the second connection end; one end of the switch side of the relay 130 is connected to the first connection end, and the other end of the switch side of the relay 130 connected to the second connection terminal; the pre-conduction circuit 110 is used to generate a level signal that triggers the delay circuit 120, and the delay circuit 120 responds to the level signal and delays the closing of the switch side of the control relay 130 to The first connection end and the second connection end are turned on.

The pre-conduction circuit 110 includes a first resistor R1, a seventh resistor R7 and a first capacitor C1; the upper end of the first resistor R1 is connected to the positive electrode of the power supply, and the lower ends of the first resistor R1 are respectively connected to the seventh resistor The upper end of R7 is connected to the upper end of the first capacitor C1, and the lower end of the first capacitor C1 is respectively connected to the delay circuit 120 and the negative pole of the power supply; the lower end of the seventh resistor R7 is connected to the delay circuit 120.

The delay circuit 120 includes: an optocoupler OPT1, a first diode D1, a second capacitor C2, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a first comparator U1A, and an eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13, the fourteenth resistor R14, the fifteenth resistor R15, the electrolytic capacitor E1, the second diode D2, the second comparator U1B, the eighteenth resistor R18, the first Five diodes D5, seventeenth resistor R17 and MOS transistor Q1; the first input end of the optocoupler OPT1 is respectively connected to the cathode of the first diode D1 and the pre-conduction circuit 110, the The second input terminal of the optocoupler OPT1 is respectively connected to the anode of the first diode D1 and the pre-conduction circuit 110, and the first output terminal of the optocoupler OPT1 is respectively connected to the first comparator U1A and the lower end of the tenth resistor R10, the second output terminal of the optocoupler OPT1 is connected to the ground terminal; the second input terminal of the first comparator U1A is respectively connected to the eleventh resistor The upper end of R11 and the upper end of the twelfth resistor R12, the lower end of the eleventh resistor R11 is connected to the power supply terminal, the lower end of the twelfth resistor R12 is connected to the ground terminal; the upper end of the tenth resistor R10 is connected to the The lower end of the eighth resistor R8, the lower end of the ninth resistor R9 and the lower end of the second capacitor C2, the upper end of the eighth resistor R8 is connected to the power supply terminal, the upper end of the ninth resistor R9 and the second The upper end of the capacitor C2 is connected to the ground terminal; the output end of the first comparator U1A is connected to the left end of the thirteenth resistor R13, and the right end of the thirteenth resistor R13 is respectively connected to the second end of the second comparator U1B. The input terminal, the anode of the second diode D2, the lower end of the fourteenth resistor R14, the upper end of the fifteenth resistor R15 and the anode of the electrolytic capacitor E1, the cathode of the electrolytic capacitor E1 and The lower end of the fifteenth resistor R15 is connected to the ground terminal, the cathode of the second diode D2 and the upper end of the fourteenth resistor R14 are connected to the power supply terminal; the first input terminal of the second comparator U1B is connected to Power supply terminal, the output terminal of the second comparator U1B is respectively connected to the lower end of the eighteenth resistor R18, the cathode of the fifth diode D5, the upper end of the seventeenth resistor R17 and the MOS transistor The gate of Q1, the upper end of the eighteenth resistor R18 is connected to the power supply terminal, the source of the MOS transistor Q1, the anode of the fifth diode D5 and the lower end of the seventeenth resistor R17 are connected to the ground terminal ; The drain of the MOS transistor Q1 is connected to the relay 130 .

Preferably, the relay control circuit further includes: a third diode D3, a fourth diode D4 and a sixteenth resistor R16; the upper ends of the sixteenth resistor R16 are respectively connected to the negative electrodes of the third diode D3 , the upper end and the power supply end of the relay 130; the lower end of the sixteenth resistor R16 is connected to the anode of the fourth diode D4, and the cathode of the fourth diode D4 is connected to the third diode respectively The anode of the tube D3 and the lower end of the relay 130 .

Referring to FIG. 2, a soft-start charging circuit includes: a rectifier circuit, an inductor L1, a third capacitor C3, a fuse, a DC load, and the above-mentioned relay control circuit 100; the upper end of the rectifier circuit is connected to the inductor The left end of L1, the lower end of the rectifier circuit are respectively connected to the lower end of the third capacitor C3 and the DC load; the right end of the inductor L1 is connected to the upper end of the third capacitor C3 and the left end of the fuse, the The right end of the fuse is connected to the first connection end of the control circuit of the relay 130 , and the second connection end of the control circuit of the relay 130 is connected to the DC load.

The rectifier circuit includes a sixth diode D6, a seventh diode D7, an eighth diode D8, a ninth diode D9, a tenth diode D10 and an eleventh diode D11; the The anode of the sixth diode D6, the anode of the seventh diode D7, the anode of the eighth diode D8, the cathode of the ninth diode D9, the tenth diode D10 The negative electrode of the diode D11 and the negative electrode of the eleventh diode D11 are respectively connected to the AC power generation group 200; the negative electrode of the sixth diode D6 is connected to the negative electrode of the seventh diode D7, the The cathode of the pole tube D8 and the left end of the inductor L1; the anode of the ninth diode D9 is connected to the anode of the tenth diode D10, the anode of the eleventh diode D11 and the The lower end of the three capacitors C3.

By adding the relay control circuit 100 to the battery pack charging circuit, the current is first buffered by the resistance of the pre-conduction circuit 110, the optocoupler OPT1 in the delay circuit 120 is turned on, and the first comparator outputs a high level, which is used for electrolysis. When the capacitor E1 is charged, when the voltage of the electrolytic capacitor E1 is higher than the set voltage (12V), the second comparator outputs a high level, which makes the MOS tube Q1 conduct, the coil of the relay 130 is energized and the open contact is usually closed, and the rectifier circuit resistance is short-circuited , the current is completely applied to the load, the time for the capacitor to reach 12V is controlled within 30S, and the whole process is delayed for 30s to achieve the effect of buffering and soft start, making the current more stable, protecting the load, and simple and practical.

Preferably, the models of the first comparator U1A and the second comparator U1B are LM393.

Preferably, the type of MOS transistor Q1 is 50N06.

Preferably, the optocoupler OPT1 model is TLP521-1.

The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, and within the scope of knowledge possessed by those of ordinary skill in the technical field, various changes can also be made without departing from the purpose of the present invention. .

Claims (7)

1. A soft-start relay control circuit, characterized in that: comprising: a first connection end, a second connection end, a pre-conduction circuit, a delay circuit and a relay; One end of the pre-conduction circuit is connected to the first connection end, and the other end of the pre-conduction circuit is connected to the second connection end; One end of the switch side of the relay is connected to the first connection end, and the other end of the switch side of the relay is connected to the second connection end; The pre-conduction circuit is used to generate a level signal that triggers the delay circuit, and the delay circuit responds to the level signal and delays the closing of the switch side of the control relay to conduct the first connection end and the second connection end ; The pre-conduction circuit includes a first resistor, a seventh resistor and a first capacitor; the upper end of the first resistor is connected to the positive electrode of the power supply, and the lower end of the first resistor is respectively connected to the upper end of the seventh resistor and the first resistor. The upper end of a capacitor, the lower end of the first capacitor is respectively connected to the delay circuit and the negative pole of the power supply; the lower end of the seventh resistor is connected to the delay circuit; The delay circuit includes: a photocoupler, a first diode, a second capacitor, an eighth resistor, a ninth resistor, a tenth resistor, a first comparator, an eleventh resistor, a twelfth resistor, and a tenth resistor. Three resistors, fourteenth resistors, fifteenth resistors, electrolytic capacitors, second diodes, second comparators, eighteenth resistors, fifth diodes, seventeenth resistors and MOS transistors; the photoelectric coupling The first input terminal of the photocoupler is respectively connected to the cathode of the first diode and the pre-conduction circuit, and the second input terminal of the optocoupler is respectively connected to the anode of the first diode and the pre-conduction circuit. a turn-on circuit, the first output end of the optocoupler is respectively connected to the first input end of the first comparator and the lower end of the tenth resistor, and the second output end of the optocoupler is connected to the ground end; The second input terminal of the first comparator is respectively connected to the upper end of the eleventh resistor and the upper end of the twelfth resistor, the lower end of the eleventh resistor is connected to the power supply terminal, and the lower end of the twelfth resistor is connected to the ground terminal; the upper end of the tenth resistor is respectively connected to the lower end of the eighth resistor, the lower end of the ninth resistor and the lower end of the second capacitor, the upper end of the eighth resistor is connected to the power supply terminal, the The upper end of the nine resistors and the upper end of the second capacitor are connected to the ground terminal; the output end of the first comparator is connected to the left end of the thirteenth resistor, and the right end of the thirteenth resistor is respectively connected to the second comparator The second input end of the device, the anode of the second diode, the lower end of the fourteenth resistor, the upper end of the fifteenth resistor and the anode of the electrolytic capacitor, the cathode of the electrolytic capacitor and the The lower end of the fifteenth resistor is connected to the ground terminal, the cathode of the second diode and the upper end of the fourteenth resistor are connected to the power terminal; the first input terminal of the second comparator is connected to the power terminal, the The output end of the second comparator is respectively connected to the lower end of the eighteenth resistor, the cathode of the fifth diode, the upper end of the seventeenth resistor and the gate of the MOS transistor. The upper end of the resistor is connected to the power supply terminal, the source of the MOS tube, the anode of the fifth diode and the lower end of the seventeenth resistor are connected to the ground terminal; the drain of the MOS tube is connected to the relay. 2. A soft-start relay control circuit according to claim 1, characterized in that: further comprising: a third diode, a fourth diode and a sixteenth resistor; the upper end of the sixteenth resistor are respectively connected to the negative pole of the third diode, the upper end of the relay and the power supply terminal; the lower end of the sixteenth resistor is connected to the positive pole of the fourth diode, and the negative pole of the fourth diode is respectively Connect the anode of the third diode and the lower end of the relay. 3 . The soft-start relay control circuit according to claim 1 , wherein the first comparator and the second comparator are LM393. 4 . 4 . The soft-start relay control circuit according to claim 1 , wherein the type of the MOS tube is 50N06. 5 . 5 . The soft-start relay control circuit according to claim 1 , wherein the optocoupler model is TLP521-1. 6 . 6. A soft-start charging circuit, characterized in that it comprises: a rectifier circuit, an inductor, a third capacitor, a fuse, a DC load, and a soft-start relay control circuit according to any one of claims 1 to 5 The upper end of the rectifier circuit is connected to the left end of the inductance, and the lower end of the rectifier circuit is respectively connected to the lower end of the third capacitor and the DC load; the right end of the inductance is connected to the upper end of the third capacitor and the DC load. The left end of the fuse, the right end of the fuse is connected to the first connection end of the relay control circuit, and the second connection end of the relay control circuit is connected to the DC load. 7. A soft-start charging circuit according to claim 6, wherein the rectifier circuit comprises a sixth diode, a seventh diode, an eighth diode, a ninth diode, The tenth diode and the eleventh diode; the anode of the sixth diode, the anode of the seventh diode, the anode of the eighth diode, the ninth diode The cathode of the tenth diode, the cathode of the tenth diode and the cathode of the eleventh diode are respectively connected to the AC power supply terminals; the cathode of the sixth diode is connected to the cathode of the seventh diode, and the cathode of the sixth diode is connected to the the cathode of the eighth diode and the left end of the inductor; the anode of the ninth diode is connected to the anode of the tenth diode, the anode of the eleventh diode and the third the lower end of the capacitor.

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