CN219678153U - Photovoltaic charging protection circuit and photovoltaic charging controller - Google Patents
Photovoltaic charging protection circuit and photovoltaic charging controller Download PDFInfo
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- CN219678153U CN219678153U CN202320469658.1U CN202320469658U CN219678153U CN 219678153 U CN219678153 U CN 219678153U CN 202320469658 U CN202320469658 U CN 202320469658U CN 219678153 U CN219678153 U CN 219678153U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model relates to the field of photovoltaic charging, in particular to a photovoltaic charging protection circuit and a photovoltaic charging controller. The photovoltaic charging protection circuit comprises a photovoltaic unit, a voltage reduction unit, a relay unit, a voltage comparison unit, a driving buffer unit and a main control unit, wherein the voltage reduction unit is used for reducing the voltage of the photovoltaic unit and outputting the reduced voltage; the relay unit is arranged between the photovoltaic unit and the voltage reduction unit; the voltage comparison unit is used for comparing the voltage output by the voltage reduction unit with a preset voltage value and outputting a level signal according to a comparison result; the main control unit is respectively connected with the driving buffer unit and the voltage comparison unit and outputs a switch control signal to the driving buffer unit; the driving buffer unit is connected with the output end of the voltage comparison unit, and starts or stops outputting a switch control signal of the main control unit to the relay unit based on the level signal output by the voltage comparison unit so as to control the on-off of the relay unit. The utility model can improve the reliability of charging the external battery and the load equipment.
Description
Technical Field
The utility model relates to the field of photovoltaic charging, in particular to a photovoltaic charging protection circuit and a photovoltaic charging controller.
Background
In a photovoltaic charge controller, a step-down charging circuit is generally adopted to step down the voltage of photovoltaic and then charge a battery, and the battery is discharged through an external load device.
In the related art, a freewheeling circuit of the buck charging circuit adopts a power diode or a field effect transistor to freewheels. However, when the main power tube in the step-down charging circuit is damaged and short-circuited, the voltage of the photovoltaic output is directly output to the battery and is output to the load device connected in parallel with the battery. Because the highest input voltage allowed by the load equipment connected with the battery in parallel is lower, the voltage directly output by the photovoltaic is high, the load equipment can be directly damaged, and the charging reliability is low.
Disclosure of Invention
The technical problem to be solved by the utility model is to provide a photovoltaic charging protection circuit and a photovoltaic charging controller aiming at the defects in the prior art, and solve the problems that the existing photovoltaic charging is easy to damage load equipment and has low charging reliability.
The technical scheme adopted for solving the technical problems is as follows: the photovoltaic charging protection circuit comprises a photovoltaic unit, a voltage reduction unit, a relay unit, a voltage comparison unit, a driving buffer unit and a main control unit, wherein the voltage reduction unit is used for reducing the voltage of the photovoltaic unit and outputting the reduced voltage;
the relay unit is arranged between the photovoltaic and the voltage reduction unit; the voltage comparison unit is used for comparing the voltage output by the voltage reduction unit with a preset voltage value and outputting a level signal according to a comparison result; the main control unit is respectively connected with the driving buffer unit and the voltage comparison unit and outputs a switch control signal to the driving buffer unit; the driving buffer unit is connected with the output end of the voltage comparison unit, and starts or stops outputting a switch control signal of the main control unit to the relay unit based on the level signal output by the voltage comparison unit so as to control the on-off of the relay unit.
Among them, the preferred scheme is: the relay unit comprises a first relay which is arranged between the photovoltaic and the step-down unit in series, and the control end of the first relay is connected with the driving buffer unit.
Among them, the preferred scheme is: the relay unit further includes a precharge module for absorbing a surge current, the precharge module being connected in parallel with the first relay.
Among them, the preferred scheme is: the pre-charging module comprises an adjustable resistor, a second relay and an input capacitor which are sequentially connected in series, wherein the other end of the adjustable resistor is connected with the anode of the photovoltaic and one end of the first relay, a series node of the second relay and the input capacitor is connected with the other end of the first relay, a control end of the second relay is connected with the driving buffer unit, and the other end of the input capacitor is connected with the cathode of the photovoltaic.
Among them, the preferred scheme is: the driving buffer unit comprises a first driving buffer and a second driving buffer, the first driving buffer is respectively connected with the output end of the voltage comparison unit, the main control unit and the control end of the first relay, and the second driving buffer is respectively connected with the output end of the voltage comparison unit, the main control unit and the control end of the second relay.
Among them, the preferred scheme is: the photovoltaic charging protection circuit further comprises a signal inversion unit, wherein the signal inversion unit is arranged between the output end of the voltage comparison unit and the driving buffer unit, and the signal inversion unit is used for converting the level signal output by the voltage comparison unit into a level signal with opposite phase.
Among them, the preferred scheme is: the signal inversion unit comprises an inverter, the input end of the inverter is connected with the output end of the voltage comparison unit, and the output end of the inverter is connected with the driving buffer unit.
Among them, the preferred scheme is: the signal inversion unit further comprises a pull-up resistor and a diode, one end of the pull-up resistor is connected with an external power supply, the other end of the pull-up resistor is connected with the input end of the inverter, the positive electrode of the diode is connected with the input end of the inverter, and the negative electrode of the diode is connected with the output end of the voltage comparison unit.
Among them, the preferred scheme is: the step-down unit comprises a first switch tube, a second switch tube, an inductor and an energy storage capacitor, wherein the first switch tube and the second switch tube are connected in series, the drain electrode of the first switch tube is connected with the relay unit, the source electrode of the second switch tube is connected with the negative electrode of the photovoltaic device, the grid electrode of the first switch tube and the grid electrode of the second switch tube are connected with the main control unit, the series connection node of the first switch tube and the second switch tube is connected with one end of the inductor, the other end of the inductor is connected with the energy storage capacitor, and the other end of the energy storage capacitor is connected with the negative electrode of the photovoltaic device.
The technical scheme adopted for solving the technical problems is as follows: the photovoltaic charging controller comprises the photovoltaic charging protection circuit.
Compared with the prior art, the photovoltaic power generation device has the advantages that the relay unit is arranged between the photovoltaic power generation device and the voltage reduction unit, the voltage comparison unit is arranged to compare the voltage output by the voltage reduction unit with the preset voltage value, the drive buffer unit is used for outputting the level signal according to the comparison result, and the drive buffer unit is used for starting or stopping outputting the switch control signal of the main control unit to the relay unit based on the level signal output by the voltage comparison unit so as to control the relay unit to be turned on or off, so that the relay unit is controlled to be turned off under the condition that the output voltage is too high, the passage between the photovoltaic power generation device and the voltage reduction unit is rapidly cut off, the voltage output is cut off, and the reliability of the photovoltaic charging controller for charging the battery and the load equipment is improved.
Drawings
The utility model will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a block diagram of the structure of the photovoltaic charge protection circuit of the present utility model;
FIG. 2 is a schematic diagram of a portion of a photovoltaic charge protection circuit of the present utility model;
FIG. 3 is a circuit diagram of a first driving buffer of the driving buffer unit of FIG. 1;
FIG. 4 is a circuit diagram of a second drive buffer of the drive buffer unit of FIG. 1;
fig. 5 is a circuit schematic of the voltage comparing unit and the signal inverting unit in fig. 1.
The reference numerals in the drawings are as follows:
10. a photovoltaic; 20. a step-down unit; 30. a relay unit; 31. a precharge module; 40. a voltage comparing unit; 41. a voltage detection module; 50. a driving buffer unit; 60. a main control unit; 70. a signal inversion unit;
k1, a first relay; k2, a second relay; r1, an adjustable resistor; r2, pull-up resistor; c1, inputting a capacitor; c2, an energy storage capacitor; u1, a first drive buffer; u2, a second drive buffer; u3, an inverter; u4, a comparator; d1, a diode; q1, a first switching tube; q2, a second switching tube; l1, inductance.
Detailed Description
Preferred embodiments of the present utility model will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the present utility model provides a preferred embodiment of a photovoltaic charge protection circuit.
Referring to fig. 1, the photovoltaic charge protection circuit includes a photovoltaic 10, a step-down unit 20, a relay unit 30, a voltage comparison unit 40, a driving buffer unit 50, and a main control unit 60.
The photovoltaic 10 can utilize the photovoltaic effect of the photovoltaic 10 cell to directly convert solar radiation energy into electric energy and output voltage.
The step-down unit 20 is configured to step down the voltage of the photovoltaic device 10 and output the voltage.
The relay unit 30 is disposed between the photovoltaic 10 and the step-down unit 20.
The voltage comparing unit 40 is configured to compare the voltage output by the voltage step-down unit 20 with a preset voltage value, and output a level signal according to the comparison result;
the main control unit 60 is connected with the driving buffer unit 50 and the voltage comparison unit 40 respectively, and outputs a switch control signal to the driving buffer unit 50;
the driving buffer unit 50 is connected to the output terminal of the voltage comparing unit 40, and starts or stops outputting a switching control signal of the main control unit 60 to the relay unit 30 based on the level signal output from the voltage comparing unit 40, so as to control the on or off of the relay unit 30.
According to the utility model, the relay unit 30 is arranged between the photovoltaic 10 and the voltage reduction unit 20, the voltage comparison unit 40 is arranged to compare the voltage output by the voltage reduction unit 20 with the preset voltage value, the level signal is output according to the comparison result, the driving buffer unit 50 is used for starting or stopping outputting the switch control signal of the main control unit 60 to the relay unit 30 based on the level signal output by the voltage comparison unit 40 so as to control the relay unit 30 to be turned on or off, and the relay unit 30 is controlled to be turned off under the condition that the short circuit output voltage of the voltage reduction unit 20 is too high, so that the channel between the photovoltaic 10 and the voltage reduction unit 20 is cut off rapidly, the voltage output is cut off, and the reliability of charging an external battery and load equipment is improved.
Referring to fig. 1 and 2, the relay unit 30 includes a first relay K1. The first relay K1 is disposed in series between the photovoltaic 10 and the step-down unit 20, and a control end of the first relay K1 is connected with the driving buffer unit 50.
The driving buffer unit 50 starts or stops outputting a switching control signal of the main control unit 60 to the control end of the first relay K1 based on the level signal output from the voltage comparing unit 40, and controls the on or off of the first relay K1, thereby switching on or off the path between the photovoltaic 10 and the step-down unit 20.
When the first relay K1 is turned on, the path between the photovoltaic 10 and the voltage reduction unit 20 is turned on, and the photovoltaic 10 can be output after being reduced by the voltage reduction unit 20 to supply power to the external battery and the load device. When the first relay K1 is turned off, the path between the photovoltaic device 10 and the step-down unit 20 is cut off, and even if the components in the step-down unit 20 are short-circuited, the photovoltaic device 10 cannot output voltage to the external battery and the load device through the step-down unit 20, so that the possibility that the load device is damaged by the high voltage output by the photovoltaic device 10 is reduced, and the charging reliability is improved.
Referring to fig. 1 and 2, the relay unit 30 further includes a precharge module 31 for absorbing an inrush current. The precharge module 31 is connected in parallel with the first relay K1. The voltage output by the photovoltaic 10 is transmitted to the voltage reduction unit 20 through the first relay K1, surge current exists, and the pre-charging module 31 is arranged, so that the pre-charging module 31 can be used for absorbing the surge current before the first relay K1 is conducted, and the contact of the first relay K1 is effectively protected.
Specifically, the precharge module 31 includes an adjustable resistor R1, a second relay K2, and an input capacitor C1 connected in series in this order. The other end of the adjustable resistor R1 is connected with the positive electrode of the photovoltaic 10 and one end of the first relay K1. The series node of the second relay K2 and the input capacitor C1 is connected to the other end of the first relay K1, and the control end of the second relay K2 is connected to the driving buffer unit 50. The other end of the input capacitor C1 is connected to the negative electrode of the photovoltaic 10.
Under the condition that the voltage output by the voltage reduction unit 20 is smaller than the preset voltage value, the driving buffer unit 50 outputs a switch control signal of the main control unit 60 to the second relay K2, the second relay K2 is conducted, the adjustable resistor R1 is adjusted to a proper resistance value, the voltage output by the photovoltaic 10 charges the input capacitor C1 through the adjustable resistor R1 and the second relay K2, surge current is absorbed, and the contact of the first relay K1 is effectively protected.
In case that the voltage outputted from the step-down unit 20 is greater than the preset voltage value, the driving buffer unit 50 stops outputting the switching control signal of the main control unit 60 to the second relay K2, i.e., the driving buffer unit 50 outputs the low level signal, and the second relay K2 is turned off.
In one embodiment, referring to fig. 1, 3 and 4, the driving buffer unit 50 includes a first driving buffer U1 and a second driving buffer U2. The first driving buffer U1 is connected to the output terminal of the voltage comparing unit 40, the main control unit 60 and the control terminal of the first relay K1, and the second driving buffer U2 is connected to the output terminal of the voltage comparing unit 40, the main control unit 60 and the control terminal of the second relay K2.
Through setting up first drive buffer U1 and second drive buffer U2, the switch control signal of main control unit 60 can be respectively through first drive buffer U1 and second drive buffer U2, controls first relay K1 and second relay K2's conduction state respectively, and control is convenient.
Specifically, the enable end of the first driving buffer U1 is connected to the output end of the voltage comparing unit 40, the input end of the first driving buffer U1 is connected to the main control unit 60, and the output end is connected to the control end of the first relay K1. When the enable end of the first driving buffer U1 receives the low level signal, the first driving buffer U1 is enabled, the first driving buffer U1 is turned on to transmit the switch control signal of the main control unit 60 to the control end of the first relay K1, the switch control signal of the main control unit 60 may be set to the high level signal, and the first driving buffer U1 outputs the high level signal to turn on the first relay K1. When the enable end of the first driving buffer U1 receives the high level signal, the first driving buffer U1 is in a high impedance off state, the transmission of the switch control signal of the main control unit 60 to the control end of the first relay K1 is stopped, the output of the first driving buffer U1 is a low level signal, and the first relay K1 is turned off. The pn_pv-Relay signal shown in fig. 3 is a switching control signal to the first Relay K1 output from the main control unit 60, and the PV-Relay signal is a signal output from the first driving buffer U1 to the first Relay K1.
The enabling end of the second driving buffer U2 is connected to the output end of the voltage comparing unit 40, the input end of the second driving buffer U2 is connected to the main control unit 60, and the output end is connected to the control end of the second relay K2. When the enable end of the second driving buffer U2 receives the low level signal, the second driving buffer U2 is enabled, the second driving buffer U2 is turned on to transmit the switch control signal of the main control unit 60 to the control end of the second relay K2, the switch control signal of the main control unit 60 can be set to be a high level signal, and the second driving buffer U2 outputs the high level signal to turn on the second relay K2. When the enable end of the second driving buffer U2 receives the high level signal, the second driving buffer U2 is in the high impedance off state, the transmission of the switch control signal of the main control unit 60 to the control end of the second relay K2 is stopped, the output of the second driving buffer U2 is the low level signal, and the second relay K2 is turned off. The pn_pv-Relay-Aux signal shown in fig. 4 is a switching control signal to the second Relay K2 outputted from the main control unit 60, and the PV-Relay-Aux signal is a signal outputted from the second driving buffer U2 to the second Relay K2.
In other embodiments, the driving buffer unit 50 may also be provided with a third driving buffer, where the third driving buffer is provided with a plurality of input ends and a plurality of output ends, the plurality of input ends are connected to different ports of the main control unit 60, and the different output ends may be respectively connected to the control ends of the first relay K1 and the second relay K2, so as to implement control over the first relay K1 and the second relay K2.
In one embodiment, referring to fig. 1, the photovoltaic charge protection circuit further includes a signal inversion unit 70, where the signal inversion unit 70 is disposed between the output terminal of the voltage comparison unit 40 and the driving buffer unit 50. The signal inverting unit 70 is used for converting the level signal output by the voltage comparing unit 40 into a level signal with opposite phase.
By providing the signal inverting unit 70, the waveform of the level signal output from the voltage comparing unit 40 can be shaped, and interference of some signals can be prevented.
Specifically, referring to fig. 1 and 5, the signal inverting unit 70 includes an inverter U3, an input terminal of the inverter U3 is connected to an output terminal of the voltage comparing unit 40, and an output terminal of the inverter U3 is connected to the driving buffer unit 50.
The inverter U3 may invert the phase of the level signal outputted from the voltage comparing unit 40 by 180 degrees, and output a level signal having a phase opposite to that of the original level signal, and may shape the waveform of the original level signal, thereby preventing interference of some signals. The level signal output by inverter U3 is EN-CHG identified in fig. 3-5.
In one embodiment, the signal inverting unit 70 further includes a pull-up resistor R2 and a diode D1. One end of the pull-up resistor R2 is connected with an external power supply, and the other end is connected with the input end of the inverter U3. The positive electrode of the diode D1 is connected to the input terminal of the inverter U3, and the negative electrode is connected to the output terminal of the voltage comparing unit 40.
By providing the pull-up resistor R2 and the diode D1 at the input terminal of the inverter U3, when the voltage output by the voltage step-down unit 20 is greater than the preset voltage value, the output terminal of the voltage comparison unit 40 outputs a low level signal, and the input terminal of the inverter U3 is a low level signal instead of a high level signal, so as to prevent erroneous judgment of the level signal.
In one embodiment, referring to fig. 1 and 2, the step-down unit 20 includes a first switching tube Q1, a second switching tube Q2, an inductance L1, and a storage capacitor C2. The first switching tube Q1 and the second switching tube Q2 are arranged in series, the drain electrode of the first switching tube Q1 is connected with the relay unit 30, the source electrode of the second switching tube Q2 is connected with the cathode of the photovoltaic 10, the grid electrode of the first switching tube Q1 and the grid electrode of the second switching tube Q2 are connected with the main control unit 60, and the series connection node of the first switching tube Q1 and the second switching tube Q2 is connected with one end of the inductor L1. The other end of the inductor L1 is connected with an energy storage capacitor C2, and the other end of the energy storage capacitor C2 is connected with the negative electrode of the photovoltaic 10.
When the first relay K1 of the relay unit 30 is turned on, the main control unit 60 controls the first switching tube Q1 to be turned on, controls the second switching tube Q2 to be turned off, and the current of the inductor L1 rises linearly to output energy storage; the main control unit 60 controls the first switching tube Q1 to be turned off, controls the second switching tube Q2 to be turned on, the current of the inductor L1 decreases linearly, and the voltage of the photovoltaic 10 is reduced and output through the follow current of the second switching tube Q2.
In one embodiment, referring to fig. 1 and 5, the voltage comparison unit 40 includes a comparator U4 and a voltage detection module 41. The comparator U4 has a non-inverting input connected to the main control unit 60, an inverting input connected to the voltage detection module 41, and an output connected to the drive buffer unit 50. The voltage detection module 41 is connected to the step-down unit 20. The voltage detection module 41 is configured to detect the voltage output by the voltage step-down unit 20, and transmit the detected voltage to the inverting input terminal of the comparator U4. In fig. 5, the pwm_set_vout_ref signal is the signal transmitted from the main control unit 60 to the non-inverting input terminal of the comparator U4.
The main control unit 60 outputs a PWM signal to the non-inverting input terminal of the comparator U4. By setting the duty cycle of the PWM signal, a preset voltage value corresponding to the non-inverting input terminal of the input comparator U4 is set, which may be set correspondingly based on the voltage protection value of the external battery and the parameters of the components of the voltage detection module 41. Setting the preset voltage value by setting the duty cycle of the PWM signal through the main control unit 60 belongs to the prior art, and the software part thereof does not belong to the improvement of the present utility model.
Referring to fig. 1 to 5, the general operation principle of the photovoltaic charge protection circuit of the present utility model is as follows:
the voltage detection module 41 of the voltage comparison unit 40 detects the voltage output by the voltage step-down unit 20, and transmits the detected voltage to the inverting input terminal of the comparator U4, the comparator U4 compares the voltage detected by the voltage detection module 41 with a preset voltage value input from the non-inverting input terminal, and the comparator U4 outputs a low level signal in case that the voltage is greater than the preset voltage value. The low-level signal is converted into the high-level signal through the inverter U3 of the signal inversion unit 70 in an inversion way, the enabling ends of the first driving buffer U1 and the second driving buffer U2 of the driving buffer unit 50 receive the high-level signal, the first driving buffer U1 and the second driving buffer U2 are in a high-impedance off state, the switch control signal of the main control unit 60 is stopped from being transmitted to the control ends of the first relay K1 and the second relay K2, the output ends of the first driving buffer U1 and the second driving buffer U2 output the low-level signal, the first relay K1 and the second relay K2 are in an off state, a passage between the photovoltaic 10 and the voltage reduction unit 20 is cut off, voltage is not output, and damage to an external battery and load equipment is avoided.
In the case where the voltage detected by the voltage detection module 41 is smaller than the preset voltage value, the comparator U4 outputs a high level signal. The high level signal is inverted and converted into the low level signal through the inverter U3 of the signal inversion unit 70, the enable ends of the first driving buffer U1 and the second driving buffer U2 of the driving buffer unit 50 receive the low level signal, the first driving buffer U1 and the second driving buffer U2 are enabled, the switch control signal of the main control unit 60 is started to be transmitted to the control ends of the first relay K1 and the second relay K2, the main control unit 60 outputs the high level signal to the control end of the second relay K2 through the second driving buffer U2, the second relay K2 is started, the photovoltaic 10 charges the input capacitor C1 through the adjustable resistor R1 and the second relay K2 of the precharge module 31, and the surge current is absorbed. The main control unit 60 outputs a high-level signal to the control end of the first relay K1 through the first driving buffer U1, the first relay K1 is turned on, and the photovoltaic 10 is output after being reduced by the voltage reducing unit 20 to supply power for an external battery and load equipment.
The utility model also provides a preferred embodiment of the photovoltaic charge controller.
The photovoltaic charging controller comprises the photovoltaic charging protection circuit. According to the photovoltaic charging protection circuit of the photovoltaic charging controller, the relay unit 30 is arranged between the photovoltaic 10 and the voltage reduction unit 20, the voltage comparison unit 40 is arranged to compare the voltage output by the voltage reduction unit 20 with the preset voltage value, the driving buffer unit 50 outputs a level signal according to the comparison result, and the switching control signal of the main control unit 60 is started or stopped to be output to the relay unit 30 based on the level signal output by the voltage comparison unit 40 so as to control the relay unit 30 to be turned on or off, so that the relay unit 30 is controlled to be cut off under the condition that the output voltage is too high, the passage between the photovoltaic 10 and the voltage reduction unit 20 is cut off quickly, and the voltage output is cut off, so that the charging reliability of the photovoltaic charging controller to a battery and load equipment is improved.
The foregoing description of the preferred embodiments of the present utility model is not intended to limit the scope of the utility model, but rather is intended to cover all modifications and variations within the scope of the present utility model as defined in the appended claims.
Claims (10)
1. The photovoltaic charging protection circuit is characterized by comprising a photovoltaic unit, a voltage reduction unit, a relay unit, a voltage comparison unit, a driving buffer unit and a main control unit, wherein,
the voltage reduction unit is used for reducing the voltage of the photovoltaic and outputting the voltage;
the relay unit is arranged between the photovoltaic and the voltage reduction unit;
the voltage comparison unit is used for comparing the voltage output by the voltage reduction unit with a preset voltage value and outputting a level signal according to a comparison result;
the main control unit is respectively connected with the driving buffer unit and the voltage comparison unit and outputs a switch control signal to the driving buffer unit;
the driving buffer unit is connected with the output end of the voltage comparison unit, and starts or stops outputting a switch control signal of the main control unit to the relay unit based on the level signal output by the voltage comparison unit so as to control the on-off of the relay unit.
2. The photovoltaic charge protection circuit according to claim 1, wherein the relay unit includes a first relay disposed in series between the photovoltaic and the step-down unit, and a control end of the first relay is connected with the drive buffer unit.
3. The photovoltaic charge protection circuit of claim 2, wherein the relay unit further comprises a pre-charge module for absorbing an inrush current, the pre-charge module being connected in parallel with the first relay.
4. A photovoltaic charge protection circuit according to claim 3, wherein the precharge module comprises an adjustable resistor, a second relay and an input capacitor connected in series in sequence, the other end of the adjustable resistor is connected with the positive pole of the photovoltaic and one end of the first relay, the series node of the second relay and the input capacitor is connected with the other end of the first relay, the control end of the second relay is connected with the drive buffer unit, and the other end of the input capacitor is connected with the negative pole of the photovoltaic.
5. The photovoltaic charge protection circuit according to claim 4, wherein the driving buffer unit includes a first driving buffer and a second driving buffer, the first driving buffer is respectively connected with the output terminal of the voltage comparing unit, the main control unit, and the control terminal of the first relay, and the second driving buffer is respectively connected with the output terminal of the voltage comparing unit, the main control unit, and the control terminal of the second relay.
6. The photovoltaic charge protection circuit according to claim 1, further comprising a signal inversion unit, wherein the signal inversion unit is disposed between the output end of the voltage comparison unit and the driving buffer unit, and is configured to convert the level signal output by the voltage comparison unit into a level signal with opposite phase.
7. The photovoltaic charge protection circuit according to claim 6, wherein the signal inverting unit includes an inverter, an input terminal of the inverter is connected to an output terminal of the voltage comparing unit, and an output terminal of the inverter is connected to the driving buffer unit.
8. The photovoltaic charge protection circuit according to claim 7, wherein the signal inverting unit further comprises a pull-up resistor and a diode, one end of the pull-up resistor is connected to an external power supply, the other end is connected to the input terminal of the inverter, the positive electrode of the diode is connected to the input terminal of the inverter, and the negative electrode is connected to the output terminal of the voltage comparing unit.
9. The photovoltaic charging protection circuit according to any one of claims 1 to 8, wherein the step-down unit includes a first switching tube, a second switching tube, an inductor, and an energy storage capacitor, the first switching tube and the second switching tube are arranged in series, a drain electrode of the first switching tube is connected with the relay unit, a source electrode of the second switching tube is connected with a negative electrode of the photovoltaic, a gate electrode of the first switching tube and a gate electrode of the second switching tube are both connected with the main control unit, a series node of the first switching tube and the second switching tube is connected with one end of the inductor, the other end of the inductor is connected with the energy storage capacitor, and the other end of the energy storage capacitor is connected with the negative electrode of the photovoltaic.
10. A photovoltaic charge controller comprising the photovoltaic charge protection circuit of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320469658.1U CN219678153U (en) | 2023-03-02 | 2023-03-02 | Photovoltaic charging protection circuit and photovoltaic charging controller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320469658.1U CN219678153U (en) | 2023-03-02 | 2023-03-02 | Photovoltaic charging protection circuit and photovoltaic charging controller |
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| CN219678153U true CN219678153U (en) | 2023-09-12 |
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| CN202320469658.1U Active CN219678153U (en) | 2023-03-02 | 2023-03-02 | Photovoltaic charging protection circuit and photovoltaic charging controller |
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Address after: 518000 Guangdong, Shenzhen, Baoan District, Baoan District City, the third floor of the community of 13A, Wutong Industrial Park, 4 layers and 5 stories. Patentee after: Shenzhen Shuorixin Energy Technology Co.,Ltd. Address before: 518000 Guangdong, Shenzhen, Baoan District, Baoan District City, the third floor of the community of 13A, Wutong Industrial Park, 4 layers and 5 stories. Patentee before: SHENZHEN SHUORI NEW ENERGY TECHNOLOGY Co.,Ltd. |