CN217824301U - Charging control circuit and energy storage equipment - Google Patents
Charging control circuit and energy storage equipment Download PDFInfo
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- CN217824301U CN217824301U CN202220961497.3U CN202220961497U CN217824301U CN 217824301 U CN217824301 U CN 217824301U CN 202220961497 U CN202220961497 U CN 202220961497U CN 217824301 U CN217824301 U CN 217824301U
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Abstract
The application discloses charge control circuit and energy storage equipment, charge control circuit includes: the voltage conversion circuit is used for converting the power supply voltage output by the power supply when receiving the enabling voltage and outputting the working voltage for supplying power to the control circuit; the enabling circuit is connected with the enabling end of the voltage conversion circuit and used for providing enabling voltage for the voltage conversion circuit; the control circuit is used for controlling the power supply voltage to charge the energy storage circuit and outputting a turn-off signal when the voltage of the energy storage circuit is detected to be greater than a preset threshold value in the charging process of the energy storage circuit; and the turn-off circuit is connected with the control circuit and the voltage conversion circuit and is used for outputting the non-enabling voltage to the enabling end of the voltage conversion circuit when receiving the turn-off signal. The application avoids the voltage conversion circuit from being in a working state all the time in the process of charging the energy storage device and consuming the input power of the power voltage, and improves the charging efficiency of the energy storage circuit.
Description
Technical Field
The application belongs to the technical field of circuits, and particularly relates to a charging control circuit and energy storage equipment.
Background
An MPPT (Maximum Power Point Tracking) system is a system for charging an energy storage circuit using solar energy, and is widely used in recent years because it can effectively use solar energy and does not generate environmental pollution. In an MPPT system, an operating voltage is generally required for operating each component, and the operating voltage is generally small, and generally an input voltage needs to be converted accordingly to obtain the operating voltage. Currently, when the MPPT system charges the tank circuit, the circuit generating the working voltage is always in the working state, and the input of the circuit generating the working voltage is also from the solar energy, so that the circuit generating the working voltage always consumes the input power of the MPPT system, thereby reducing the efficiency of the MPPT system charging the tank circuit.
It is noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the application and therefore may include information that does not constitute prior art that is already known to a person of ordinary skill in the art.
SUMMERY OF THE UTILITY MODEL
An object of the present application is to provide a charging control circuit and an energy storage device, so as to optimize the problem of low charging efficiency of the energy storage circuit in the charging circuit in the related art.
According to an aspect of an embodiment of the present application, there is provided a charge control circuit including:
the voltage conversion circuit is connected with the power supply and used for converting the power supply voltage output by the power supply and outputting the working voltage for supplying power to the control circuit when the enabling voltage is received;
the enabling circuit is connected with the enabling end of the voltage conversion circuit and used for providing the enabling voltage for the voltage conversion circuit;
the control circuit is respectively connected with the voltage conversion circuit, the power supply and the energy storage circuit, is used for controlling the power supply voltage to charge the energy storage circuit, and is also used for outputting a turn-off signal when the voltage of the energy storage circuit is detected to be greater than a preset threshold value in the charging process of the energy storage circuit;
and the turn-off circuit is connected with the control circuit and the voltage conversion circuit and is used for outputting a non-enabled voltage to an enabling end of the voltage conversion circuit when receiving the turn-off signal.
In one embodiment of the present application, the turn-off circuit includes a switching tube, a first turn-off resistor and a second turn-off resistor;
the first turn-off resistor is connected between the controlled end of the switching tube and the control circuit;
the second turn-off resistor is connected between the controlled end and the first end of the switching tube;
the first end of the switch tube is grounded, and the second end of the switch tube is connected with the enabling end of the voltage conversion circuit.
In one embodiment of the present application, the voltage conversion circuit includes:
the conversion module is connected with the power supply and used for converting the power supply voltage output by the power supply to obtain conversion voltage and outputting the conversion voltage;
the filtering module is connected with the conversion module and used for filtering the conversion voltage and outputting the working voltage;
and the voltage sampling module is connected with the conversion module and used for sampling the working voltage and feeding back a sampling signal to the conversion module so that the conversion module adjusts the working voltage according to the sampling signal.
In one embodiment of the present application, the filtering module includes a filtering inductor, a first filtering capacitor, and a freewheeling diode;
the first end of the filter inductor is connected with the voltage output end of the conversion module and the negative electrode of the fly-wheel diode, and the positive electrode of the fly-wheel diode is grounded;
the second end of the filter inductor is connected with the first end of the first filter capacitor, and the second end of the first filter capacitor is grounded.
In one embodiment of the present application, the voltage sampling module includes a first sampling resistor, a second sampling resistor, and a second filter capacitor;
the first end of the first sampling resistor is connected with the second end of the filter inductor, and the second end of the first sampling resistor is connected with the second sampling resistor and then grounded;
the second filter capacitor is connected with the first sampling resistor in parallel;
and the common end of the first sampling resistor and the second sampling resistor is connected with the voltage sampling end of the conversion module.
In an embodiment of the present application, the voltage sampling module further includes a third sampling resistor, and the third sampling resistor is disposed between the second filter capacitor and the voltage sampling terminal of the conversion module.
In one embodiment of the present application, the enabling circuit includes a first voltage dividing resistor and a second voltage dividing resistor;
a first end of the first voltage-dividing resistor is connected with an enabling power supply, a second end of the first voltage-dividing resistor is connected with a first end of the second voltage-dividing resistor, and a second end of the second voltage-dividing resistor is grounded;
and the first end of the second voltage-dividing resistor is connected with the enabling end of the voltage conversion circuit.
In one embodiment of the present application, the enabling circuit further comprises a third filter capacitor and a zener diode;
the third filter capacitor is connected in parallel with the second divider resistor;
the anode of the voltage stabilizing diode is grounded, and the cathode of the voltage stabilizing diode is connected with the common end of the first divider resistor and the second divider resistor.
In one embodiment of the present application, the charge control circuit further comprises a voltage detection circuit; the voltage detection circuit is connected with the control circuit and the energy storage circuit and used for detecting the voltage of the energy storage circuit and feeding the detected voltage of the energy storage circuit back to the control circuit.
According to an aspect of the embodiments of the present application, there is provided an energy storage device, which includes an energy storage circuit and the charging control circuit in the above technical solution.
According to the technical scheme, the turn-off circuit is arranged in the charging control circuit and arranged between the voltage conversion circuit and the control circuit, when the control circuit detects that the voltage of the energy storage device is larger than a preset threshold value, the turn-off circuit outputs a turn-off signal, and then the turn-off circuit outputs non-enabling voltage to the enabling end of the voltage conversion circuit according to the turn-off signal. Then, when the enable end of the voltage conversion circuit receives the non-enable voltage, the voltage conversion circuit cannot continue to work, so that the voltage conversion circuit is prevented from being in a working state all the time in the process of charging the energy storage device and consuming the input power of the power supply voltage, and the charging efficiency of the energy storage circuit is improved.
Drawings
Fig. 1 schematically illustrates a block diagram of a charging control circuit according to an embodiment of the present application.
Fig. 2 schematically shows a block diagram of a charging control circuit according to another embodiment of the present application.
Fig. 3 schematically illustrates a structural schematic diagram of a charge control circuit provided in another embodiment of the present application.
Fig. 4 schematically shows a block diagram of an energy storage device according to an embodiment of the present application.
Detailed Description
Exemplary embodiments that embody features and advantages of the present application will be described in detail in the following description. It is to be understood that the present application is capable of various modifications in various embodiments without departing from the scope of the application, and that the description and drawings are to be taken as illustrative and not restrictive in character.
Fig. 1 schematically illustrates a block diagram of a charging control circuit according to an embodiment of the present application.
As shown in fig. 1, a charging control circuit 1 provided in the embodiment of the present application includes a voltage conversion circuit 100, an enable circuit 200, a control circuit 300, and a shutdown circuit 400.
The voltage conversion circuit 100 is respectively connected to the power supply 600, the enable circuit 200, the control circuit 300 and the shutdown circuit 400, wherein the voltage conversion circuit 100 has an enable terminal 101, and the enable terminal 101 is connected to the enable circuit 200 and the shutdown circuit 400. The control circuit 300 is connected to the power supply 600, the voltage conversion circuit 100, the tank circuit 700 and the shutdown circuit 400, respectively.
Under normal conditions, the enable terminal 101 of the voltage converting circuit 100 receives an enable voltage output by the enable circuit 200, and the enable voltage causes the voltage converting circuit 100 to operate normally. When the voltage conversion circuit 100 works normally, it receives the power voltage input by the power supply 600 and converts the power voltage, where the converted voltage is the working voltage of the control circuit 300, that is, the control circuit 300 works normally under the driving of the working voltage. When the control circuit 300 works normally, the power supply voltage is controlled to charge the tank circuit 700 (i.e., activate the tank circuit 700), so that the tank circuit 700 can store enough power. Meanwhile, after the tank circuit 700 is activated, the operating voltage of the control circuit 300 will be provided by the tank circuit 700.
In the above operation process, after the energy storage circuit 700 is activated, the operating voltage of the control circuit 300 is already provided by the energy storage circuit 700, and the voltage conversion circuit 100 is always in an operating state, that is, the power supply voltage is always converted, and the conversion of the power supply voltage by the voltage conversion circuit 100 consumes a part of the input power of the power supply voltage (equivalent to a part of the electric energy consumed by the power supply voltage), so that the input power of the power supply voltage for charging the energy storage circuit 700 is reduced, and the charging efficiency of the energy storage circuit 700 is reduced.
In this embodiment, in the process of charging the tank circuit 700, the control circuit 300 detects the voltage of the tank circuit 700, and when it is detected that the voltage of the tank circuit 700 is greater than the preset threshold, outputs a shutdown signal, where the shutdown signal may instruct the shutdown circuit 400 to output a non-enabled voltage to the enable terminal 101 of the voltage conversion circuit 100, where the non-enabled voltage is a voltage that the voltage conversion circuit 100 cannot enable. The detection of the voltage of the tank circuit 700 by the control circuit 300 may be real-time detection or periodic detection.
When the enable terminal 101 of the voltage conversion circuit 100 receives a non-enable voltage, the voltage conversion circuit 100 converts from enable to non-enable, and the voltage conversion circuit 100 does not continue to work normally (or enters a low power consumption state), that is, the voltage conversion circuit 100 enters an off state and does not perform conversion processing on the power supply voltage, so that the voltage conversion circuit 100 does not consume the input power of the power supply voltage, and the input power of the power supply voltage can be more used for charging the energy storage circuit 700, thereby improving the charging efficiency of the energy storage circuit 700. Meanwhile, since the operating voltage of the control circuit 300 is provided by the tank circuit 700, even if the voltage converting circuit 100 enters the off state, the operating state of the control circuit 300 is not affected.
In one embodiment of the present application, the preset threshold corresponding to the voltage of the tank circuit 700 is set as a safe discharge voltage of the tank circuit 700, where the safe discharge voltage is a critical voltage for preventing the tank circuit 700 from being damaged during discharging. When the voltage of the tank circuit 700 is greater than the safe discharge voltage, the control circuit 300 outputs a shutdown signal, and the shutdown circuit 400 disables the voltage conversion circuit 100 based on the shutdown signal. Because the voltage of the energy storage circuit 700 is greater than the safe discharge voltage, the energy storage circuit 700 is not damaged due to the fact that the voltage is too low to discharge when the voltage conversion circuit 100 is turned off, and the safety of the energy storage circuit 700 is guaranteed. For example, if the safe discharge voltage of the tank circuit 700 is 20V, the control circuit 300 outputs a shutdown signal when detecting that the voltage of the tank circuit 700 is greater than 20V.
Fig. 2 schematically shows a block diagram of a charging control circuit according to another embodiment of the present application, which is a further refinement of the charging control circuit shown in fig. 1.
As shown in fig. 2, the charge control circuit 1 of the embodiment of the present application includes a voltage conversion circuit 100, an enable circuit 200, a control circuit 300, a shutdown circuit 400, and a voltage detection circuit 500.
The voltage conversion circuit 100 includes a conversion module 110, a filtering module 120, and a voltage sampling module 130, wherein the conversion module 110 is connected to the power supply 600, and the filtering module 120 and the voltage sampling module 130 are respectively connected to the conversion module 110.
The control circuit 300 includes a control chip 310 and a switch module 320, wherein the control chip 310 is connected to the shutdown circuit 400 and the voltage detection circuit 500, and the switch module 320 and the voltage detection circuit 500 are respectively connected to the tank circuit 700.
The turn-off circuit 400 includes a switching tube, a first turn-off resistor and a second turn-off resistor, the switching tube has a controlled end, a first end and a second end, the first turn-off resistor is connected between the controlled end of the switching tube and the control chip 310 of the control circuit 300, the second turn-off resistor is connected between the controlled end of the switching tube and the first end of the switching tube, meanwhile, the first end of the switching tube is grounded, and the second end of the switching tube is connected with the enable end of the voltage conversion circuit 100.
The enabling circuit 200 comprises a first voltage-dividing resistor and a second voltage-dividing resistor, wherein a first end of the first voltage-dividing resistor is connected with an enabling power supply, a second end of the first voltage-dividing resistor is connected with a first end of the second voltage-dividing resistor, and a second end of the second voltage-dividing resistor is grounded; the first terminal of the second voltage-dividing resistor is connected to the enable terminal of the voltage converting circuit 100.
In the embodiment of the present application, the enable power supply inputs an enable input voltage to the first terminal of the first voltage-dividing resistor of the enable circuit 200, and the voltage-dividing action of the first voltage-dividing resistor and the second voltage-dividing resistor enables the enable input voltage to be converted into an enable voltage of the voltage conversion circuit 100, and the enable voltage is input to the enable terminal of the voltage conversion circuit 100 through the first terminal of the second voltage-dividing resistor (i.e., the common terminal of the first voltage-dividing resistor and the second voltage-dividing resistor), so that the voltage conversion circuit 100 can operate normally. The enabling input voltage is recorded as Vin _ aux, if the first voltage-dividing resistor comprises a plurality of resistors connected in parallel, the first voltage-dividing resistor is recorded as Rs, the second voltage-dividing resistor is recorded as R4, and the enabling voltage EN = Vin _ aux Rs/(Rs + R4), so that the enabling voltage with the required size can be obtained by adjusting the resistance values of the first voltage-dividing resistor and the second voltage-dividing resistor.
When the voltage conversion circuit 100 works normally, the conversion module 110 receives the power voltage provided by the power supply 600 and converts the power voltage to obtain a conversion voltage. The converted voltage is input to the filtering module 120, and after being filtered by the filtering module 120, the working voltage is output and input to the control circuit 300.
The control circuit 300 normally operates after receiving the operating voltage, and the specific working process is as follows: the control chip 310 controls the switch module 320 to be turned on, so that the power voltage is connected to the energy storage circuit 700, thereby achieving the purpose of charging the energy storage circuit 700. Meanwhile, the tank circuit 700 is activated upon receiving the power supply voltage, and the activated tank circuit 700 provides the operating voltage for the control circuit 300.
During the charging process of the tank circuit 700, the voltage detection circuit 500 detects the voltage of the tank circuit 700 and feeds back the detected voltage of the tank circuit 700 to the control circuit 300. The control circuit 300 compares the tank circuit 700 voltage with a preset threshold and outputs a shutdown signal to the shutdown circuit 400 when it is determined that the tank circuit 700 voltage is greater than the preset threshold.
In the turn-off circuit 400, a turn-off signal is input to the controlled terminal of the switching tube via the first turn-off resistor, and the first terminal and the second terminal of the switching tube are turned on. Since the first end of the switch tube is grounded and the second end of the switch tube is connected to the enable end of the voltage conversion circuit 100, when the first end and the second end of the switch tube are conducted, it is equivalent to grounding the enable end of the voltage conversion circuit 100, so that the voltage conversion circuit 100 is in a non-enabled state and cannot continue to operate to output the operating voltage of the control circuit 300. The switch tube in the shutdown circuit 400 may be a triode, a field effect transistor (such as a MOS tube), a transistor (such as an IGBT tube), or the like.
In the embodiment of the present application, in the working process of the voltage conversion circuit 100, the voltage sampling module 130 samples the working voltage, the sampling signal reflects the magnitude of the working voltage, the voltage sampling module 130 feeds back the sampling signal to the conversion module 110, and the conversion module 110 can adjust the working voltage in time. This is because the operating voltage required by the control circuit 300 is a certain value (or within a certain range), and neither too large nor too small of an operating voltage (or an operating voltage not within a range) is suitable for powering the control circuit 300. For example, when the output working voltage is detected to be greater than the threshold value, the working voltage is adjusted to be reduced; and when the output working voltage is detected to be smaller than the threshold value, adjusting the working voltage to increase. Of course, when the output operating voltage is detected to be equal to the threshold, no adjustment is required.
In an embodiment of the present application, a voltage conversion secondary circuit may be further added between the voltage conversion circuit 100 and the control circuit 300, and the voltage conversion secondary circuit is configured to perform secondary conversion on the operating voltage output by the voltage conversion circuit 100 to obtain the operating voltage required by the control circuit 300. For example, if the operating voltage output by the voltage converting circuit 100 is 12V and the operating voltage required by the control circuit 300 is 3.3V, a voltage converting secondary circuit may be added to convert the operating voltage of 12V into an operating voltage of 3.3V.
In one embodiment of the present application, the power supply 600 is a solar panel, and the power voltage is a voltage output by the solar panel collecting solar energy and converting the solar energy into electric energy.
In an embodiment of the present application, a transformer circuit may be further added between the control circuit 300 and the tank circuit 700, and the transformer circuit is used to adjust the power voltage to output a suitable voltage for charging the tank circuit 700. For example, when the power supply voltage is less than the charging voltage required by the tank circuit 700, the transforming circuit boosts the power supply voltage so that the voltage reaching the tank circuit 700 increases; when the power supply voltage is greater than the charging voltage required by the energy storage circuit 700, the voltage transformation circuit performs voltage reduction processing on the power supply voltage, so that the voltage reaching the energy storage circuit 700 is reduced; when the supply voltage is equal to the desired charging voltage for the tank circuit 700, no adjustment of the supply voltage is required.
Fig. 3 schematically shows a structural diagram of a charge control circuit according to another embodiment of the present application, which is a further refinement of the charge control circuit shown in fig. 2.
As shown in fig. 3, in the charge control circuit, the voltage conversion circuit 100 includes a conversion module 110, a filtering module 120, and a voltage sampling module 130. The conversion module 110 is a chip U1, an EN pin of the chip U1 is an enable terminal of the voltage conversion circuit 100, a TM pin is a clock signal terminal, and the EN pin is connected to the TM pin and then connected to an enable power supply and the shutdown circuit 400. The VIN pin of the chip U1 is a voltage input end, is connected with a power supply and receives power supply voltage MPPT _ VIN, and is also connected with a capacitor C5, and the other end of the capacitor C5 is grounded. The GND pin and the EP pin of the chip U1 are both grounded. The SW pin of the chip U1 is a voltage output end, and the chip U1 converts the power supply voltage MPPT _ Vin to obtain a conversion voltage, and the conversion voltage is output to the filtering module 120 through the SW pin. The FB pin of the chip U1 is a voltage sampling terminal, which is connected to the voltage sampling module 130 and receives a sampling signal fed back by the voltage sampling module 130. The BST pin of the chip U1 is connected with the SW pin after being connected with the capacitor C2. The NC pin of the chip U1 is empty.
The filtering module 120 includes a filtering inductor L1, a first filtering capacitor, and a freewheeling diode D5. The SW pin of the chip U1 is connected with the first end of the filter inductor L1 and the negative electrode of the freewheeling diode D5, and the positive electrode of the freewheeling diode D5 is grounded. The second end of the filter inductor L2 is connected to the first end of the first filter capacitor, and the second end of the first filter capacitor is grounded. In the embodiment of the present application, the first filter capacitor is formed by 3 capacitors connected in parallel, as shown in fig. 3, and is formed by connecting a capacitor C6, a capacitor C4, and a capacitor C7 in parallel.
The voltage sampling module 130 includes a first sampling resistor, a second sampling resistor R15, a third sampling resistor R14, and a second filter capacitor C3. The first sampling resistor is composed of a resistor R11 and a resistor R13 connected in series, and in practical application, the first sampling resistor may be a single resistor. The first end of the first sampling resistor is connected with the second end of the filter inductor L1, and the second end of the first sampling resistor is connected with the second sampling resistor R15 and then grounded. One end of the second filter capacitor C3 is connected to the first end of the first sampling resistor, the other end of the second filter capacitor C3 is connected to one end of the third sampling resistor R14, and the other end of the third sampling resistor R14 is connected to the second sampling resistor R15. The common end of the first sampling resistor and the second sampling resistor R15 is connected with the FB pin of the chip U1.
In an embodiment of the present application, the third sampling resistor R14 may be eliminated, and the second filter capacitor C3 may be directly connected in parallel across the first sampling resistor.
In the embodiment of the present application, a common terminal of the filter inductor L1 and the first filter capacitor is denoted as a node TP0, and the node TP0 outputs an operating voltage obtained by converting the power voltage MPPT _ Vin through the chip U1, generally, the output voltage of the SW pin of the chip U1 has the same magnitude as the output voltage of the node TP0, but the difference between the two is that the former is not subjected to filtering processing, and the latter is subjected to filtering processing. Further, the sampling signal of the voltage sampling module 130 is a voltage generated by the output voltage of the node TP0 on the second sampling resistor R15. When the output voltage of the node TP0 increases, the voltage on the second sampling resistor R15 increases synchronously; when the output voltage at the node TP0 decreases, the voltage at the second sampling resistor R15 decreases synchronously.
In the embodiment of the present application, the operating voltage output by the chip U1 is 12V, and the operating voltage required by the general control circuit 300 is 3.3V, therefore, the node TP0 is further connected to the anode of the diode D3, the cathode of the diode D3 is connected to the node TP2, and the node TP2 is further connected to a voltage conversion secondary circuit (not shown in the figure), which converts the 12V voltage into a 3.3V voltage to power the control circuit 300, and for convenience of description, the voltage at the node TP2 is regarded as the operating voltage of the control circuit 300.
As shown in fig. 3, in the charge control circuit according to the embodiment of the present application, the enable circuit 200 includes a first voltage-dividing resistor and a second voltage-dividing resistor R4. The first voltage-dividing resistor is formed by two resistors R1 and R2 connected in parallel, and in practical cases, the first voltage-dividing resistor may also be implemented by one resistor. A first terminal of the first voltage-dividing resistor is connected to the enable power source Vin _ aux, a second terminal of the first voltage-dividing resistor is connected to a first terminal of the second voltage-dividing resistor R4, and a second terminal of the second voltage-dividing resistor R4 is grounded. A common connection end of the first voltage-dividing resistor and the second voltage-dividing resistor R4 is referred to as a node TP1, the node TP1 is connected to an EN pin of the chip U1, and an enable voltage, which is a voltage generated by the enable power source Vin _ aux at the second voltage-dividing resistor R4, is input to the EN pin of the chip U1.
The enabling circuit 200 further includes a third filter capacitor C1 and a voltage regulator diode D1, the third filter capacitor C1 is connected in parallel to two ends of the second voltage-dividing resistor R4, a cathode of the voltage regulator diode D1 is connected to a first end of the second voltage-dividing resistor R4, and an anode of the voltage regulator diode D1 is connected to a second end of the second voltage-dividing resistor R4. The third filter capacitor C1 is used for filtering the enable power source Vin _ aux. The voltage stabilizing diode D1 is configured to clamp an enable voltage at the node TP1 at a preset enable voltage value, and prevent the enable power source Vin _ aux from providing an excessive voltage, which may cause the enable voltage received by the EN pin of the chip U1 to be excessive and cause the chip U1 to be burned out.
As shown in fig. 3, in the charging control circuit according to the embodiment of the present application, the control circuit 300 includes a switch module (not shown in the figure) and a control chip MCU, and the control chip MCU is connected to the voltage detection circuit 500 and the shutdown circuit 400 respectively. The signal acquisition end of the voltage detection circuit 500 is connected to the anode of the diode D2, and the anode of the diode D2 is connected to the cathode of the diode D3. The signal acquisition terminal of the voltage detection circuit 500 is used for acquiring the voltage BAT + of the tank circuit.
The turn-off circuit 400 includes a transistor Q1, a first turn-off resistor R3, and a second turn-off resistor R5, where the controlled terminal of the transistor Q1 is a base, the first terminal of the transistor Q1 is an emitter, and the second terminal of the transistor Q1 is a collector. The first cut-off resistor R3 is connected between the base of the triode Q1 and the MCU, the second cut-off resistor R5 is connected between the base and the emitting electrode of the triode Q1, the emitting electrode of the triode Q1 is grounded, and the collecting electrode of the triode Q1 is connected with the EN pin of the chip U1.
The operating principle of the charge control circuit shown in fig. 3 is explained below from two operating states.
In the first working state, the energy storage circuit starts to charge, and the voltage BAT + of the energy storage circuit is smaller than a preset threshold value. The enable power source Vin _ aux supplies an enable voltage (high level signal) to the chip U1 through the node TP1 so that the chip U1 can normally operate. When the chip U1 can normally work, the power supply voltage MPPT _ Vin is input into the chip U1, and the working voltage is obtained at the node TP2 through conversion and is used for supplying power to the control chip MCU, so that the control chip MCU can normally work. The control chip MCU controls the switch module to be conducted, so that the power supply voltage MPPT _ Vin is connected into the energy storage circuit to charge the energy storage circuit. In the charging process of the energy storage circuit, the voltage BAT + of the energy storage circuit is continuously increased, the diode D2 is turned on, and the voltage of the node TP2 can be provided by the voltage BAT + of the energy storage circuit.
In the second working state, the energy storage circuit is charged for a period of time, and the voltage BAT + of the energy storage circuit is greater than the preset threshold value. In the charging process of the energy storage circuit, the voltage detection circuit 500 continuously detects the voltage BAT + of the energy storage circuit and feeds the voltage BAT + of the energy storage circuit back to the control chip MCU. The control chip MCU compares the voltage BAT + of the energy storage circuit with a preset threshold, and outputs a shutdown signal MPPT SPS SD # (which is a high level signal) to the shutdown circuit 400 when detecting that the voltage BAT + of the energy storage circuit is greater than the preset threshold. The MPPT SPS SD # signal is input to the base of the transistor Q1 through the first turn-off resistor R3 in the circuit of the turn-off circuit 400, so that the emitter and the collector of the transistor Q1 are connected. Because triode Q1 transmission set ground connection, the triode Q1 collecting electrode output low level signal after switching on so to make chip U1's EN pin receive low level signal, chip U1 can not continue normal work, and chip U1 no longer handles mains voltage MPPT _ Vin. After the chip U1 is turned off, the voltage of the node TP2 is still maintained by the voltage BAT + of the energy storage circuit, and the control chip MCU can continue to control the power supply voltage MPPT _ Vin to charge the energy storage circuit.
Fig. 4 schematically shows a block diagram of an energy storage device according to an embodiment of the present application. As shown in fig. 4, the energy storage device includes an energy storage circuit 700 and a charging control circuit 1, where the charging control circuit 1 may be a charging control circuit provided in any embodiment of the present application, and a specific circuit structure and an operating principle of the charging control circuit may refer to related descriptions in the foregoing embodiments, and are not described herein again.
While the present application has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present application may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (10)
1. A charge control circuit, comprising:
the voltage conversion circuit is connected with the power supply and used for converting the power supply voltage output by the power supply and outputting the working voltage for supplying power to the control circuit when the enabling voltage is received;
the enabling circuit is connected with the enabling end of the voltage conversion circuit and used for providing the enabling voltage for the voltage conversion circuit;
the control circuit is respectively connected with the voltage conversion circuit, the power supply and the energy storage circuit, is used for controlling the power supply voltage to charge the energy storage circuit, and is also used for outputting a turn-off signal when the voltage of the energy storage circuit is detected to be greater than a preset threshold value in the charging process of the energy storage circuit;
and the turn-off circuit is connected with the control circuit and the voltage conversion circuit and is used for outputting a non-enabled voltage to an enabling end of the voltage conversion circuit when receiving the turn-off signal.
2. The charge control circuit according to claim 1, wherein the turn-off circuit comprises a switching tube, a first turn-off resistor and a second turn-off resistor;
the first turn-off resistor is connected between the controlled end of the switching tube and the control circuit;
the second turn-off resistor is connected between the controlled end and the first end of the switching tube;
the first end of the switch tube is grounded, and the second end of the switch tube is connected with the enabling end of the voltage conversion circuit.
3. The charge control circuit of claim 1, wherein the voltage conversion circuit comprises:
the conversion module is connected with the power supply and used for converting the power supply voltage output by the power supply to obtain conversion voltage and outputting the conversion voltage;
the filtering module is connected with the conversion module and used for filtering the conversion voltage and outputting the working voltage;
and the voltage sampling module is connected with the conversion module and used for sampling the working voltage and feeding back a sampling signal to the conversion module so that the conversion module adjusts the working voltage according to the sampling signal.
4. The charge control circuit of claim 3, wherein the filtering module comprises a filtering inductor, a first filtering capacitor, and a freewheeling diode;
the first end of the filter inductor is connected with the voltage output end of the conversion module and the negative electrode of the fly-wheel diode, and the positive electrode of the fly-wheel diode is grounded;
the second end of the filter inductor is connected with the first end of the first filter capacitor, and the second end of the first filter capacitor is grounded.
5. The charge control circuit of claim 4, wherein the voltage sampling module comprises a first sampling resistor, a second sampling resistor, and a second filter capacitor;
the first end of the first sampling resistor is connected with the second end of the filter inductor, and the second end of the first sampling resistor is connected with the second sampling resistor and then grounded;
the second filter capacitor is connected with the first sampling resistor in parallel;
and the common end of the first sampling resistor and the second sampling resistor is connected with the voltage sampling end of the conversion module.
6. The charge control circuit of claim 5, wherein the voltage sampling module further comprises a third sampling resistor disposed between the second filter capacitor and the voltage sampling terminal of the conversion module.
7. The charge control circuit of claim 1, wherein the enabling circuit comprises a first voltage dividing resistor and a second voltage dividing resistor;
a first end of the first voltage-dividing resistor is connected with an enabling power supply, a second end of the first voltage-dividing resistor is connected with a first end of the second voltage-dividing resistor, and a second end of the second voltage-dividing resistor is grounded;
and the first end of the second voltage-dividing resistor is connected with the enabling end of the voltage conversion circuit.
8. The charge control circuit of claim 7, wherein the enabling circuit further comprises a third filter capacitor and a zener diode;
the third filter capacitor is connected in parallel with the second divider resistor;
the anode of the voltage stabilizing diode is grounded, and the cathode of the voltage stabilizing diode is connected with the common end of the first divider resistor and the second divider resistor.
9. The charge control circuit according to any one of claims 1 to 8, further comprising a voltage detection circuit;
the voltage detection circuit is connected with the control circuit and the energy storage circuit and used for detecting the voltage of the energy storage circuit and feeding the detected voltage of the energy storage circuit back to the control circuit.
10. An energy storage device, characterized in that the energy storage device comprises a charge control circuit according to any one of claims 1-9 and a storage circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220961497.3U CN217824301U (en) | 2022-04-22 | 2022-04-22 | Charging control circuit and energy storage equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220961497.3U CN217824301U (en) | 2022-04-22 | 2022-04-22 | Charging control circuit and energy storage equipment |
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| CN217824301U true CN217824301U (en) | 2022-11-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117811364A (en) * | 2024-03-01 | 2024-04-02 | 深圳麦格米特电气股份有限公司 | Voltage holding circuit and method, power supply circuit and electronic equipment |
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2022
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117811364A (en) * | 2024-03-01 | 2024-04-02 | 深圳麦格米特电气股份有限公司 | Voltage holding circuit and method, power supply circuit and electronic equipment |
| CN117811364B (en) * | 2024-03-01 | 2024-06-11 | 深圳麦格米特电气股份有限公司 | Voltage holding circuit and method, power supply circuit and electronic equipment |
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