CN220172895U - Half-bridge driving protection circuit of solar charging system - Google Patents

Abstract

The utility model relates to the technical field of solar charging, and discloses a half-bridge driving protection circuit of a solar charging system, which comprises a solar panel, a half-bridge driving module, a charging module, a storage battery, a voltage stabilizing module, a main control module and a filtering module; compared with the prior art, the main control module is electrically connected to the half-bridge driving module through the filtering module, and the main control module filters the two sent PWM signals through the filtering module and then sends the two PWM signals to the half-bridge driving module, so that the condition that the two PWM signals output high level simultaneously is reduced, the two MOS tubes in the half-bridge driving module cannot be conducted simultaneously, the possibility of short circuit of the solar cell panel is reduced, and the problem that the solar cell panel is easy to burn out in the existing half-bridge driving module is solved.

Description

Half-bridge driving protection circuit of solar charging system

Technical Field

The utility model belongs to the technical field of solar charging, and particularly relates to a half-bridge driving protection circuit of a solar charging system.

Background

The solar charging system comprises a solar panel, a charging module, a half-bridge driving module and a storage battery, wherein the solar panel is electrically connected with the storage battery through the charging module so as to convert received solar energy into electric energy to be transmitted to the storage battery for charging, the half-bridge driving module is arranged between the solar panel and the charging module and used for rapidly switching on and off a loop of the solar panel for charging the storage battery, and the half-bridge driving module is externally connected with a corresponding control chip so as to realize PWM signal driving.

The half-bridge driving module is generally composed of two MOS tubes, wherein the source electrode of one MOS tube is connected with the drain electrode of the other MOS tube, and the connecting end between the two MOS tubes is used as an output end; the main control chip is respectively connected with the grids of the two MOS tubes through corresponding pins so as to send PWM signals to control the quick on-off of the two MOS tubes, in the prior art, the PWM signals of the two MOS tubes controlled by the main control chip are complementary and are influenced by external electromagnetic wave interference or clock precision of the main control chip, the PWM signals output by the main control chip can be delayed, the two PWM signals output high level simultaneously are caused, the two MOS tubes are simultaneously conducted, the solar panel is short-circuited, and finally the solar panel is burnt out.

Therefore, the existing half-bridge driving module is easy to burn out the solar panel with respect to the related art.

Disclosure of Invention

The utility model provides a half-bridge driving protection circuit of a solar charging system, which is used for solving the problem that the existing half-bridge driving module is easy to burn out a solar panel.

The technical problems to be solved by the utility model are realized by adopting the following technical scheme:

the half-bridge driving protection circuit of the solar charging system comprises a solar panel, a half-bridge driving module, a charging module, a storage battery, a voltage stabilizing module, a main control module and a filtering module, wherein the solar panel is electrically connected with the storage battery through the charging module; the half-bridge driving module is arranged between the solar panel and the charging module to switch on and off a power supply loop of the solar panel; the voltage stabilizing module is respectively and electrically connected with the storage battery, the main control module and the half-bridge driving module so as to respectively supply power to the main control module and the half-bridge driving module after the voltage of the storage battery is reduced; the filtering module is electrically connected to the main control module and the half-bridge driving module respectively, so as to receive two PWM signals sent by the main control module, filter the two PWM signals and send the filtered PWM signals to the half-bridge driving module.

According to the technical scheme, the solar panel is electrically connected with the storage battery through the charging module, so that the solar panel converts solar energy into electric energy and then transmits the electric energy to the storage battery for charging; the half-bridge driving module is arranged between the solar panel and the charging module and is used for rapidly switching on and off a power supply loop of the solar panel to the storage battery, so that the charging power of the solar panel to the storage battery is limited; the voltage stabilizing module is respectively and electrically connected with the storage battery, the main control module and the half-bridge driving module and is used for reducing the voltage of the storage battery and respectively supplying the reduced voltage to the main control module and the half-bridge driving module for supplying power, so that the main control module and the half-bridge driving module can work under normal working voltage; compared with the prior art, the main control module is electrically connected to the half-bridge driving module through the filtering module, and the main control module filters the two sent PWM signals through the filtering module and then sends the two PWM signals to the half-bridge driving module, so that the condition that the two PWM signals output high level simultaneously is reduced, the two MOS tubes in the half-bridge driving module cannot be conducted simultaneously, the possibility of short circuit of the solar cell panel is reduced, and the problem that the solar cell panel is easy to burn out in the existing half-bridge driving module is solved.

Optionally, the main control module includes a main control chip U3, the main control chip U3 is STM32F103C8T6, and a tenth pin and an eleventh pin of the main control chip U3 are respectively electrically connected to the filtering module.

Through the technical scheme, the model of the main control chip U3 is STM32F103C8T6, so that the cost performance is high; the tenth pin and the eleventh pin of the main control chip U3 are respectively and electrically connected to the filtering module so as to send the two PWM signals to the filtering module, and the filtering module filters the two received PWM signals so as to reduce the possibility that the two PWM signals simultaneously generate high level in a certain period of time.

Optionally, the filtering module includes a first chip U1 and a second chip U2, the half-bridge driving module includes a resistor R1, a resistor R2, a resistor R3, a MOS transistor Q1 and a MOS transistor Q2, the first chip U1 is a 74LS00 chip, and the second chip U2 is a SN74LS04 chip; the seventh pin of the first chip U1 is grounded; an eleventh pin of the first chip U1 is connected in series with the resistor R1 and then connected to the gate of the MOS transistor Q1, and an eleventh pin of the first chip U1 is connected to a thirteenth pin of the second chip U2; the twelfth pin of the first chip U1 is connected with the eleventh pin of the main control chip U3; the thirteenth pin of the first chip U1 is connected with the tenth pin of the main control chip U3; the fourteenth pin of the first chip U1 is connected with 5V; the seventh pin of the second chip U2 is grounded; the twelfth pin of the second chip U2 is connected with the resistor R2 in series and then connected with the grid electrode of the MOS tube Q2; the fourteenth pin of the second chip U2 is connected with 5V; the drain electrode of the MOS tube Q1 is connected with the positive pole MPPT+ of the solar panel, the source electrode of the MOS tube Q1 is connected with the drain electrode of the MOS tube Q2, and the source electrode of the MOS tube Q2 is connected with the negative pole MPPT-of the solar panel; one end of the resistor R3 is connected with the grid electrode of the MOS tube Q2, and the other end of the resistor R is connected with the source electrode of the MOS tube Q2; the MOS tube Q1 and the connecting end OUT of the MOS tube Q2 are connected with the charging module.

Through the technical scheme, the model of the first chip U1 is a 74LS00 chip, the cost of the first chip U1 is low, the first chip U1 is suitable for a high-frequency circuit, and a plurality of NAND gates are arranged in the first chip U1; the eleventh pin of the first chip U1 is connected with the grid electrode of the MOS tube Q1 in series with the resistor R1, the thirteenth pin of the first chip U1 is connected with the tenth pin of the main control chip U3, and the thirteenth pin of the first chip U1 is connected with the tenth pin of the main control chip U3, so that the first chip U1 can receive two PWM signals sent by the main control chip U3, and perform NAND operation on the two PWM signals, thereby achieving the filtering effect, and the filtered PWM signals are sent to the grid electrode of the MOS tube Q1 to control the on-off of the MOS tube Q1; the model of the second chip U2 is SN74LS04, the cost of the second chip U2 is lower, the second chip U2 is suitable for a high-frequency circuit, and a plurality of NOT gates are arranged in the second chip U2; the eleventh pin of the first chip U1 is connected with the thirteenth pin of the second chip U2, and the twelfth pin of the second chip U2 is connected with the grid electrode of the MOS tube Q2 in series with the resistor R2 so as to invert the PWM signal output by the first chip U1 and send the PWM signal to the grid electrode of the MOS tube Q2, thereby controlling the on-off of the MOS tube Q2; the half-bridge driving module is composed of a resistor R1, a resistor R2, a resistor R3, a MOS tube Q1 and a MOS tube Q2 through the connection relation, so that a loop for supplying power to the storage battery by the solar cell panel is quickly switched on and off based on the received PWM signal; compared with the prior art, the half-bridge driving module receives two complementary PWM signals sent by the first chip U1 and the second chip U2 after operation, the possibility that the two PWM signals are high in level in a certain period is reduced, the MOS tube Q1 and the MOS tube Q2 are difficult to conduct simultaneously, and therefore the possibility that the solar cell panel is burnt out due to short circuit is reduced.

Optionally, the voltage stabilizing module includes voltage stabilizing chip U4 and resistance R9, voltage stabilizing chip U4 is the LM7805 chip, the first pin of voltage stabilizing chip U4 connects in series behind the resistance R9 the positive pole bat+ of battery, the second pin of voltage stabilizing chip U4 connects the negative pole BAT-of battery, the third pin of voltage stabilizing chip U4 electricity connect in first chip U1 with second chip U2.

Through the technical scheme, the model of the voltage stabilizing chip U4 is LM7805, and the voltage stabilizing chip U4 has better voltage endurance capacity and lower cost; the first pin of the voltage stabilizing chip U4 is connected with the positive electrode BAT+ of the storage battery in series with the resistor R9, the second pin of the voltage stabilizing chip U4 is connected with the negative electrode BAT-of the storage battery, and the third pin of the voltage stabilizing chip U4 is electrically connected with the first chip U1 and the second chip U2, so that the voltage at two ends of the storage battery can be converted into 5V by the voltage stabilizing chip U4 and the first chip U1 and the second chip U2 are powered, and the first chip U1 and the second chip U2 can work under normal working voltage, thereby improving the stability of the protection circuit.

Optionally, the voltage stabilizing module further includes a voltage stabilizing chip U5, the voltage stabilizing chip U5 is an SPX1117 chip, a third pin of the voltage stabilizing chip U5 is connected to a third pin of the voltage stabilizing chip U4, a first pin of the voltage stabilizing chip U5 is grounded, and a second pin of the voltage stabilizing chip U5 is electrically connected to the main control chip U3.

Through the technical scheme, the model of the voltage stabilizing chip U5 is SPX1117, so that the voltage stabilizing chip U has lower power consumption and lower cost; the voltage stabilizing chip U5 is used for enabling the 5V voltage of the first chip U1 to be 3.3V and supplying power to the main control chip U3 chip, so that the main control chip U3 can work under normal working voltage, and the stability of the protection circuit is further improved.

Optionally, the device further comprises a voltage detection module, wherein the voltage stabilization module is electrically connected with the voltage detection module to provide 5V voltage for the voltage detection module; the voltage detection module is respectively and electrically connected with the main control module and the charging module so as to measure the voltage provided by the charging module to the storage battery and send a voltage measurement signal to the main control module.

Through the technical scheme, the voltage stabilizing module is electrically connected with the voltage detecting module and is used for providing 5V voltage for the voltage detecting module, so that the voltage detecting module works normally under stable voltage; the voltage detection module is electrically connected with the main control module and the charging module and is used for measuring the voltage provided by the charging module to the storage battery and sending a voltage measurement signal to the main control module, so that the main control module can adjust the duty ratio of a PWM signal based on the voltage measurement signal, thereby timely stopping the MOS tube Q1 and the MOS tube Q2, reducing the possibility of over-voltage charging of the storage battery and further improving the safety of the protection circuit.

Optionally, the voltage detection module includes a metering chip U6, a resistor R10, a resistor R11, a capacitor C15, and a capacitor C16, where the metering chip U6 is a 555 chip, and a first pin of the metering chip U6 is grounded; the second pin of the metering chip U6 is connected with a voltage output port VDD1 of the charging module; the third pin of the metering chip U6 is connected with the eighteenth pin of the main control chip U3; the fourth pin and the eighth pin of the metering chip U6 are connected with the third pin of the voltage stabilizing chip U4; one end of the resistor R10 is connected with a sixth pin of the metering chip U6, and the other end of the resistor R is connected with an eighth pin of the metering chip U6; one end of the capacitor C15 is connected with the first pin of the metering chip U6, and the other end of the capacitor C is grounded; one end of the capacitor C16 is connected with a fifth pin of the metering chip U6, and the other end of the capacitor C is grounded; one end of the resistor R11 is connected with the third pin of the metering chip U6, and the other end of the resistor R is grounded.

Through the technical scheme, the metering chip U6 adopts a 555 chip, and the metering chip U6 has better pressure-resistant capability and lower cost, and is suitable for a high-frequency circuit; the second pin of the metering chip U6 is connected with a voltage output port VDD1 of the charging module and is used for acquiring the voltage of the charging module for charging the storage battery in real time; the third pin of the metering chip U6 is connected with the eighteenth pin of the main control chip U3, after the metering chip U6 acquires the voltage charged by the charging module to the storage battery, the voltage is converted into a voltage metering signal through analog-digital conversion, and the voltage metering signal is sent to the main control chip U3 so that the main control chip U3 can timely stop the MOS tube Q1 according to the voltage metering signal, and therefore the safety of the protection circuit is further improved.

Optionally, the main control module further includes a resistor R8, a capacitor C1, and a reset button S1, where one end of the resistor R8 is connected to 3.3V, and the other end is connected to a seventh pin of the main control chip U3; one end of the capacitor C1 is grounded, and the other end of the capacitor C1 is connected with a seventh pin of the main control chip U3; one end of the reset button S1 is grounded, and the other end of the reset button S1 is connected with a seventh pin of the main control chip U3.

Through the technical scheme, the seventh pin of the main control chip U3 is the reset pin of the main control chip U3, when the reset button S1 is pressed, the seventh pin of the main control chip U3 is switched from high level to low level, so that the main control chip U3 is reset, a worker can conveniently reset the main control chip U3 with faults by pressing the reset button S1, the main control chip U3 is restored to a normal working state, and the reliability of the protection circuit is improved.

In summary, the present utility model includes at least one of the following beneficial technical effects:

1. compared with the prior art, the main control module is electrically connected to the half-bridge driving module through the filtering module, and the main control module filters the two sent PWM signals through the filtering module and then sends the two PWM signals to the half-bridge driving module, so that the condition that the two PWM signals output high level simultaneously is reduced, the two MOS tubes in the half-bridge driving module cannot be conducted simultaneously, the possibility of short circuit of the solar cell panel is reduced, and the problem that the solar cell panel is easy to burn out in the existing half-bridge driving module is solved.

2. Compared with the prior art, the half-bridge driving module receives two complementary PWM signals sent by the first chip U1 and the second chip U2 after operation, the possibility that the two PWM signals are high in level in a certain period is reduced, the MOS tube Q1 and the MOS tube Q2 are difficult to conduct simultaneously, and therefore the possibility that the solar cell panel is burnt out due to short circuit is reduced.

3. Compared with the prior art, after the metering chip U6 acquires the voltage for charging the storage battery by the charging module, the voltage is converted into a voltage metering signal through analog-digital conversion, and the voltage metering signal is sent to the main control chip U3, so that the main control chip U3 can timely cut off the MOS tube Q1 and the MOS tube Q2 according to the voltage metering signal, and the safety of the protection circuit is further improved.

Drawings

FIG. 1 is a schematic diagram of a half-bridge drive protection circuit of a solar charging system according to an embodiment of the present utility model;

FIG. 2 is a circuit diagram of a main control module, a filtering module and a half-bridge driving module according to an embodiment of the present utility model;

FIG. 3 is a graph of PWM signals in an embodiment of the present utility model;

fig. 4 is a circuit diagram of a voltage stabilizing module and a voltage detecting module in an embodiment of the utility model.

Reference numerals illustrate:

1. a solar cell panel; 2. a half-bridge drive module; 3. a charging module; 4. a storage battery; 5. a voltage stabilizing module; 6. a main control module; 7. a filtering module; 8. and a voltage detection module.

Detailed Description

The utility model is described in further detail below with reference to fig. 1-4.

The embodiment of the utility model discloses a half-bridge driving protection circuit of a solar charging system, which is used for solving the problem that the existing half-bridge driving module is easy to burn out a solar panel.

Referring to fig. 1, a half-bridge driving protection circuit of a solar charging system comprises a solar panel 1, a half-bridge driving module 2, a charging module 3, a storage battery 4, a voltage stabilizing module 5, a main control module 6, a filtering module 7 and a voltage detection module 8, wherein the solar panel 1 is electrically connected with the storage battery 4 through the charging module 3, so that the solar panel 1 converts solar energy into electric energy and then transmits the electric energy to the storage battery 4 for charging; the half-bridge driving module 2 is arranged between the solar panel 1 and the charging module 3 to rapidly switch on and off a power supply loop of the solar panel 1 to the storage battery 4 so as to adjust charging power; the voltage stabilizing module 5 is respectively and electrically connected with the storage battery 4, the main control module 6 and the half-bridge driving module 2, and is used for respectively supplying power to the main control module 6 and the half-bridge driving module 2 after the voltage of the storage battery 4 is reduced, so that the main control module 6 and the half-bridge driving module 2 can stably work under normal voltage; the main control module 6 is electrically connected with the half-bridge driving module 2 through the filtering module 7, the voltage detection module 8 is respectively and electrically connected with the main control module 6 and the charging module 3, and the voltage detection module 8 is used for measuring the voltage provided by the charging module 3 to the storage battery 4 and sending a voltage measurement signal to the main control module 6, so that the main control module 6 can adjust the duty ratio of sending PWM signals based on the voltage measurement signal, and further adjust the power of the solar panel 1 for charging the storage battery 4; compared with the prior art, the two PWM signals sent by the main control module 6 are filtered and modulated by the filtering module 7 and then sent to the half-bridge driving module 2, so that the possibility that the two PWM signals are simultaneously output to high level due to the interference of external electromagnetic signals is reduced, the two MOS tubes in the existing half-bridge driving module 2 cannot be simultaneously conducted, the possibility that the solar panel 1 is burnt out due to the short circuit of the positive electrode and the negative electrode is reduced, and the possibility that the solar panel 1 is easily burnt out by the existing half-bridge driving module 2 is solved.

Referring to fig. 2 and 3, the main control module 6 includes a main control chip U3, where the main control chip U3 is STM32F103C8T6, and has a higher cost performance; the filtering module 7 comprises a first chip U1 and a second chip U2, the half-bridge driving module 2 comprises a resistor R1, a resistor R2, a resistor R3, a MOS tube Q1 and a MOS tube Q2, the first chip U1 is a 74LS00 chip, and the filtering module has the advantages of low cost, low power consumption and the like, is suitable for a high-frequency circuit, and is internally provided with a plurality of NAND gates; the second chip U2 is an SN74LS04 chip, has the advantages of low cost, low power consumption, stable voltage output and the like, is suitable for a high-frequency circuit, and is internally provided with a plurality of NOT gates; the seventh pin of the first chip U1 is grounded, and the fourteenth pin of the first chip U1 is connected with 5V, so that the first chip U1 can work stably under working voltage; the eleventh pin of the first chip U1 is connected with the grid electrode of the MOS tube Q1 in series with the resistor R1, the thirteenth pin of the first chip U1 is connected with the tenth pin of the main control chip U3, the twelfth pin of the first chip U1 is connected with the eleventh pin of the main control chip U3, the main control chip U3 sends PWM1 signals to the thirteenth pin of the first chip U1 through the tenth pin, the main control chip U3 sends PWM2 signals to the twelfth pin of the first chip U1 through the eleventh pin, the first chip U1 carries out NAND operation on the PWM1 signals and the PWM2 signals to achieve the filtering effect, and the PWM signals after operation are sent to the grid electrode of the MOS tube Q1 so as to control the on-off of the MOS tube Q1; the eleventh pin of the first chip U1 is connected with the thirteenth pin of the second chip U2, the PWM signal after the first filtering is sent to the second chip U2 through the eleventh pin of the first chip U1 for signal inversion, the twelfth pin of the second chip U2 is connected with the grid electrode of the MOS tube Q2 after being connected with the resistor R2 in series, and the second chip U2 transmits the inverted PWM signal to the grid electrode of the MOS tube Q2, so that the on-off of the MOS tube Q2 is controlled; the seventh pin of the second chip U2 is grounded, and the fourteenth pin of the second chip U2 is connected with 5V, so that the second chip U2 can stably work under the working voltage; the drain electrode of the MOS tube Q1 is connected with the anode MPPT+ of the solar panel 1, the source electrode of the MOS tube Q1 is connected with the drain electrode of the MOS tube Q2, the source electrode of the MOS tube Q2 is connected with the cathode MPPT-of the solar panel 1, one end of the resistor R3 is connected with the grid electrode of the MOS tube Q2, the other end of the resistor R3 is connected with the source electrode of the MOS tube Q2, and the connecting ends OUT of the MOS tube Q1 and the MOS tube Q2 are connected with the charging module 3, so that a half-bridge driving module 2 is formed and electric energy emitted by the solar panel 1 is transmitted to the charging module 3; compared with the prior art, the half-bridge driving module 2 receives two PWM signals sent by the first chip U1 and the second chip U2 after operation, the two PWM signals are complementary, and the high-level condition can not occur at the same time, so that the MOS tube Q1 and the MOS tube Q2 are difficult to conduct simultaneously, and the possibility of burning the solar panel 1 due to short circuit is further reduced.

Referring to fig. 2, the main control module 6 further includes a resistor R8, a capacitor C1 and a reset button S1, one end of the resistor R8 is connected to 3.3V, the other end is connected to a seventh pin of the main control chip U3, one end of the capacitor C1 is grounded, the other end is connected to the seventh pin of the main control chip U3, one end of the reset button S1 is grounded, the other end is connected to the seventh pin of the main control chip U3, and when the main control chip U1 fails or needs to be initialized, a worker can press the reset button S1 to reset the main control chip U1, so that the main control chip U1 is restored to a normal working state, thereby improving the reliability of the protection circuit of the present utility model.

Referring to fig. 4, the voltage stabilizing module 5 includes a voltage stabilizing chip U4, a voltage stabilizing chip U5, a resistor R9, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, and a capacitor C14, where the voltage stabilizing chip U4 is an LM7805 chip, and has better voltage endurance and lower cost; the first pin of the voltage stabilizing chip U4 is connected with the positive electrode BAT+ of the storage battery 4 in series with the resistor R9, and the second pin of the voltage stabilizing chip U4 is connected with the negative electrode BAT-of the storage battery 4 and is used for receiving the voltages at two ends of the storage battery 4 and converting the voltage of the storage battery 4 into 5V; the third pin of the voltage stabilizing chip U4 is electrically connected with the first chip U1 and the second chip U2 and is used for transmitting stable voltage of 5V to the first chip U1 and the second chip U2, so that the first chip U1 and the second chip U2 can work stably under working voltage, and the stability of the protection circuit is improved; one end of the capacitor C5 is connected with the first pin of the voltage stabilizing chip U4, the other end of the capacitor C5 is connected with the second pin of the voltage stabilizing chip U4, one end of the capacitor C6 is connected with the first pin of the voltage stabilizing chip U4, the other end of the capacitor C6 is connected with the second pin of the voltage stabilizing chip U4, one end of the capacitor C7 is connected with the third pin of the voltage stabilizing chip U4, the other end of the capacitor C8 is connected with the second pin of the voltage stabilizing chip U4, and the capacitor C5, the capacitor C6, the capacitor C7 and the capacitor C8 are all used as filter capacitors of the voltage stabilizing chip U4, so that 5V voltage output by the voltage stabilizing chip U4 is more stable; the model of the voltage stabilizing chip U5 is SPX1117, so that the power consumption is low and the cost is low; the third pin of the voltage stabilizing chip U5 is connected with the third pin of the voltage stabilizing chip U4, the first pin of the voltage stabilizing chip U5 is grounded, the second pin of the voltage stabilizing chip U5 is electrically connected with the main control chip U3, and the voltage stabilizing chip U5 is used for providing 3.3V voltage stabilization for the main control chip U3 so that the main control chip U3 works normally under working voltage, thereby further improving the stability of the protection circuit; the capacitor C9, the capacitor C10, the capacitor C11, the capacitor C12, the capacitor C13 and the capacitor C14 are respectively connected to pins corresponding to the voltage stabilizing chip U5 and are all used as filter capacitors of the voltage stabilizing chip U5, so that the stability of the output of the voltage stabilizing chip U5 is improved by 3.3V.

Referring to fig. 4, the voltage detection module 8 includes a metering chip U6, a resistor R10, a resistor R11, a capacitor C15 and a capacitor C16, where the metering chip U6 is a 555 chip, and has a better voltage withstand capability, and the highest voltage withstand value can reach 55V, so that the voltage detection module is applicable to various solar circuits; the first pin of the metering chip U6 is grounded; the fourth pin and the eighth pin of the metering chip U6 are connected with the third pin of the voltage stabilizing chip U4; one end of the resistor R10 is connected with a sixth pin of the metering chip U6, and the other end of the resistor R is connected with an eighth pin of the metering chip U6 so as to protect the metering chip U6; one end of the capacitor C15 is connected with the first pin of the metering chip U6, and the other end of the capacitor C is grounded so as to achieve a filtering effect; one end of the capacitor C16 is connected with a fifth pin of the metering chip U6, and the other end of the capacitor C is grounded so as to achieve a filtering effect; one end of the resistor R11 is connected with a third pin of the metering chip U6, and the other end of the resistor R is grounded; the second pin of the metering chip U6 is connected with the voltage output port VDD1 of the charging module 3 so as to acquire the voltage charged by the charging module 3 to the storage battery 4 in real time, and the voltage is subjected to analog-to-digital conversion to generate a voltage metering signal; the third pin of the metering chip U6 is connected with the eighteenth pin of the main control chip U3 to send a voltage metering signal to the main control chip U3, the main control chip U3 judges whether the voltage metering signal exceeds a preset threshold value or not based on a preset program, if the voltage metering signal exceeds the preset threshold value, the PWM1 signal and the PWM2 signal are set to be high level, the MOS tube Q1 is cut off, a charging loop of the solar panel 1 to the storage battery 4 is disconnected, and the possibility of over-voltage charging of the storage battery 4 is reduced, so that the safety of the protection circuit is further improved.

The implementation principle of this embodiment is as follows:

the half-bridge driving module 2 receives two complementary PWM signals sent by the first chip U1 and the second chip U2 after operation, and the condition of high level cannot occur at the same time, so that the MOS tube Q1 and the MOS tube Q2 are difficult to conduct at the same time, and the possibility of burning out the solar cell panel 1 due to short circuit is further reduced.

The above embodiments are not intended to limit the scope of the present utility model, so: all equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.

Claims (8)

1. A half-bridge driving protection circuit of a solar charging system is characterized in that: the solar energy power generation device comprises a solar cell panel (1), a half-bridge driving module (2), a charging module (3), a storage battery (4), a voltage stabilizing module (5), a main control module (6) and a filtering module (7), wherein the solar cell panel (1) is electrically connected with the storage battery (4) through the charging module (3); the half-bridge driving module (2) is arranged between the solar panel (1) and the charging module (3) so as to switch on and off a power supply loop of the solar panel (1); the voltage stabilizing module (5) is respectively and electrically connected with the storage battery (4), the main control module (6) and the half-bridge driving module (2) so as to respectively supply power to the main control module (6) and the half-bridge driving module (2) after the voltage of the storage battery (4) is reduced; the filtering module (7) is electrically connected to the main control module (6) and the half-bridge driving module (2) respectively, so as to receive two PWM signals sent by the main control module (6), filter the two PWM signals and send the filtered PWM signals to the half-bridge driving module (2).

2. The half-bridge drive protection circuit of a solar charging system according to claim 1, wherein: the main control module (6) comprises a main control chip U3, the main control chip U3 is STM32F103C8T6, and a tenth pin and an eleventh pin of the main control chip U3 are respectively and electrically connected to the filtering module (7).

3. The half-bridge drive protection circuit of a solar charging system according to claim 2, wherein: the filtering module (7) comprises a first chip U1 and a second chip U2, the half-bridge driving module (2) comprises a resistor R1, a resistor R2, a resistor R3, a MOS tube Q1 and a MOS tube Q2, the first chip U1 is a 74LS00 chip, and the second chip U2 is a SN74LS04 chip; the seventh pin of the first chip U1 is grounded; an eleventh pin of the first chip U1 is connected in series with the resistor R1 and then connected to the gate of the MOS transistor Q1, and an eleventh pin of the first chip U1 is connected to a thirteenth pin of the second chip U2; the twelfth pin of the first chip U1 is connected with the eleventh pin of the main control chip U3; the thirteenth pin of the first chip U1 is connected with the tenth pin of the main control chip U3; the fourteenth pin of the first chip U1 is connected with 5V; the seventh pin of the second chip U2 is grounded; the twelfth pin of the second chip U2 is connected with the resistor R2 in series and then connected with the grid electrode of the MOS tube Q2; the fourteenth pin of the second chip U2 is connected with 5V; the drain electrode of the MOS tube Q1 is connected with the anode MPPT+ of the solar panel (1), the source electrode of the MOS tube Q1 is connected with the drain electrode of the MOS tube Q2, and the source electrode of the MOS tube Q2 is connected with the cathode MPPT-of the solar panel (1); one end of the resistor R3 is connected with the grid electrode of the MOS tube Q2, and the other end of the resistor R is connected with the source electrode of the MOS tube Q2; the MOS tube Q1 and the connecting end OUT of the MOS tube Q2 are connected with the charging module (3).

4. A half-bridge drive protection circuit for a solar charging system according to claim 3, wherein: the voltage stabilizing module (5) comprises a voltage stabilizing chip U4 and a resistor R9, the voltage stabilizing chip U4 is an LM7805 chip, a first pin of the voltage stabilizing chip U4 is connected in series with the resistor R9 and then connected with a positive electrode BAT+ of the storage battery (4), a second pin of the voltage stabilizing chip U4 is connected with a negative electrode BAT-of the storage battery (4), and a third pin of the voltage stabilizing chip U4 is electrically connected with the first chip U1 and the second chip U2.

5. The half-bridge drive protection circuit of a solar charging system of claim 4, wherein: the voltage stabilizing module (5) further comprises a voltage stabilizing chip U5, the voltage stabilizing chip U5 is an SPX1117 chip, a third pin of the voltage stabilizing chip U5 is connected with a third pin of the voltage stabilizing chip U4, a first pin of the voltage stabilizing chip U5 is grounded, and a second pin of the voltage stabilizing chip U5 is electrically connected with the main control chip U3.

6. The half-bridge drive protection circuit of a solar charging system of claim 4, wherein: the voltage stabilizing device further comprises a voltage detection module (8), wherein the voltage stabilizing module (5) is electrically connected with the voltage detection module (8) so as to provide 5V voltage for the voltage detection module (8); the voltage detection module (8) is electrically connected to the main control module (6) and the charging module (3) respectively, so as to measure the voltage provided by the charging module (3) to the storage battery (4) and send a voltage measurement signal to the main control module (6).

7. The half-bridge drive protection circuit of a solar charging system of claim 6, wherein: the voltage detection module (8) comprises a metering chip U6, a resistor R10, a resistor R11, a capacitor C15 and a capacitor C16, wherein the metering chip U6 is a 555 chip, and a first pin of the metering chip U6 is grounded; the second pin of the metering chip U6 is connected with a voltage output port VDD1 of the charging module (3); the third pin of the metering chip U6 is connected with the eighteenth pin of the main control chip U3; the fourth pin and the eighth pin of the metering chip U6 are connected with the third pin of the voltage stabilizing chip U4; one end of the resistor R10 is connected with a sixth pin of the metering chip U6, and the other end of the resistor R is connected with an eighth pin of the metering chip U6; one end of the capacitor C15 is connected with the first pin of the metering chip U6, and the other end of the capacitor C is grounded; one end of the capacitor C16 is connected with a fifth pin of the metering chip U6, and the other end of the capacitor C is grounded; one end of the resistor R11 is connected with the third pin of the metering chip U6, and the other end of the resistor R is grounded.

8. The half-bridge drive protection circuit of a solar charging system according to claim 2, wherein: the main control module (6) further comprises a resistor R8, a capacitor C1 and a reset button S1, wherein one end of the resistor R8 is connected with 3.3V, and the other end of the resistor R8 is connected with a seventh pin of the main control chip U3; one end of the capacitor C1 is grounded, and the other end of the capacitor C1 is connected with a seventh pin of the main control chip U3; one end of the reset button S1 is grounded, and the other end of the reset button S1 is connected with a seventh pin of the main control chip U3.