CN217692701U - Charging circuit and energy storage equipment - Google Patents
Charging circuit and energy storage equipment Download PDFInfo
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- CN217692701U CN217692701U CN202220852437.8U CN202220852437U CN217692701U CN 217692701 U CN217692701 U CN 217692701U CN 202220852437 U CN202220852437 U CN 202220852437U CN 217692701 U CN217692701 U CN 217692701U
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- 230000009466 transformation Effects 0.000 claims abstract description 65
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Abstract
The application discloses charging circuit and energy storage equipment, charging circuit includes: the voltage transformation module is used for converting the electric signal output by the power supply and outputting the electric signal through a voltage transformation output end; the switch module is connected with the power supply and the voltage transformation module and used for disconnecting the connection between the voltage transformation module and the power supply according to the turn-off control signal; the feedback module is used for sampling the power supply current and the power supply voltage output by the voltage transformation output end, comparing the sampled current obtained by sampling with the reference current, and comparing the sampled voltage obtained by sampling with the reference voltage; the feedback module is also used for outputting a feedback signal when the sampling voltage is greater than the reference voltage or the sampling current is greater than the reference current; and the control module is used for outputting a turn-off control signal to the switch module under the condition of receiving the feedback signal. The charging circuit has stronger adaptability, can output corresponding voltage or current according to actual charging requirements, and effectively improves user experience.
Description
Technical Field
The application relates to the technical field of charging, in particular to a charging circuit and energy storage equipment.
Background
Based on buck step-down circuit is comparatively ripe, adopt buck step-down circuit scheme for the power step-down in current charging circuit usually to the realization is for the load power supply that corresponds, however when power supply adopted buck step-down circuit to supply power for the load, can only adopt the output of constant voltage or constant current, can't carry out voltage or current control according to the actual charging needs of load, makes charging circuit adaptation scene less, and the user experience of charging is not good.
SUMMERY OF THE UTILITY MODEL
Based on this, the embodiment of the application provides a charging circuit and energy storage equipment, aims at realizing that the voltage or the current output by the charging circuit is adjustable, and enhances the adaptability of the charging circuit.
In a first aspect, an embodiment of the present application provides a charging circuit, including:
the voltage transformation module is used for converting the electric signal output by the power supply and outputting the electric signal through a voltage transformation output end;
the switch module is connected with the power supply and the voltage transformation module and is used for disconnecting the connection between the voltage transformation module and the power supply according to the turn-off control signal;
the input end of the feedback module is connected with the voltage transformation output end and is used for sampling the power supply current and the power supply voltage output by the voltage transformation output end, comparing the sampled current obtained by sampling with the reference current and comparing the sampled voltage obtained by sampling with the reference voltage; the feedback module is further used for outputting a feedback signal when the sampling voltage is greater than the reference voltage or the sampling current is greater than the reference current;
and the control module is connected with the switch module and the feedback module and used for outputting a turn-off control signal to the switch module under the condition of receiving the feedback signal.
In some embodiments, the charging circuit further comprises a reference module, connected to the feedback module, for providing a reference voltage and a reference current to the feedback module.
In some embodiments, the reference module comprises a voltage reference unit and a current reference unit; the voltage reference unit is connected with the feedback module and used for receiving the voltage setting signal and outputting a reference voltage according to the voltage setting signal; and the current reference unit is connected with the feedback module and used for receiving the current setting signal and outputting the reference current according to the current setting signal.
In some embodiments, the voltage reference unit includes a first voltage dividing element, a second voltage dividing element, a controllable precise voltage regulator and a first capacitor; the first end of the first voltage division element is connected with the input end of the voltage reference unit, the second end of the first voltage division element is connected with the output end of the voltage reference unit and the cathode of the controllable precise voltage stabilizing source, and the second voltage division element is connected with the first voltage division element in parallel; the cathode of the controllable precise voltage-stabilizing source is connected with the output end of the voltage reference unit; the reference electrode of the controllable precise voltage-stabilizing source is connected with the output end of the voltage reference unit, and the anode of the controllable precise voltage-stabilizing source is grounded; the first capacitor is connected between the reference pole and the anode of the controllable precise voltage-stabilizing source.
In some embodiments, the current reference unit includes a rectifier sub-unit, a first comparator, and a voltage divider sub-unit; the input end of the rectifier subunit is connected with the input end of the current reference unit, the output end of the rectifier subunit is connected with the first input end of the first comparator, and the rectifier subunit is used for receiving the current setting signal, rectifying the current setting signal and outputting the current setting signal to the first comparator; the second input end of the first comparator is connected with the output end of the first comparator, and the first comparator is used for receiving the current setting signal rectified by the rectifier subunit and outputting a comparison signal to the voltage divider subunit; and the voltage dividing subunit is used for outputting the reference current after dividing the voltage of the comparison signal.
In some embodiments, the feedback module comprises a current sampling unit, a voltage sampling unit, a current comparing unit, a voltage comparing unit and an isolation feedback unit; the current sampling unit is connected with the voltage transformation module and used for collecting power supply current and outputting the sampling current to the first input end of the current comparison unit; the second input end of the current comparison unit is connected with the current reference unit, the output end of the current comparison unit is connected with the input end of the isolation feedback unit, and the current comparison unit is used for outputting a first conduction control signal to the isolation feedback unit when the sampling current is greater than the reference current; the voltage sampling unit is connected with the voltage transformation module and used for collecting power supply voltage and outputting the sampling voltage to the first input end of the voltage comparison unit; the second input end of the voltage comparison unit is connected with the voltage reference unit, the output end of the voltage comparison unit is connected with the input end of the isolation feedback unit, and the voltage comparison unit is used for outputting a second conduction control signal to the isolation feedback unit when the sampling voltage is greater than the reference voltage; and the isolation feedback unit is connected with the control module and used for outputting a feedback signal to the control module when receiving the first conduction control signal or the second conduction control signal.
In some embodiments, the current sampling unit includes a first voltage dividing element, a second voltage dividing element, a third voltage dividing element, a first filtering module, a second filtering module, and a first comparator; a first input end of the first comparator is connected with the negative electrode of the voltage transformation output end through a first voltage division element; the second input end of the first comparator is grounded through a second voltage division element; the output end of the first comparator is connected with the first input end of the current comparison unit through the second end of the third voltage division element; the first end of the first filtering module is grounded, and the second end of the first filtering module is connected with the first input end of the first comparator; the first end of the second filter module is connected with the second input end of the first comparator and the second end of the second voltage dividing element, and the second end of the second filter module is connected with the output end of the first comparator and the first end of the third voltage dividing element.
In some embodiments, the current comparing unit includes a second comparator, a first diode, a first resistor, a second capacitor, and a third capacitor; the first input end of the second comparator is connected with the current reference unit, the second input end of the second comparator is connected with the output end of the current sampling unit, and the output end of the second comparator is connected with the output end of the first diode and is connected with the input end of the isolation feedback unit through the input end of the first diode; the first end of the first resistor is connected with the output end of the second comparator, the second end of the first resistor is connected with the first end of the second capacitor, and the second end of the second capacitor is connected with the second input end of the second comparator; the first end of the third capacitor is connected with the output end of the second comparator, and the second end of the third capacitor is connected with the second input end of the second comparator; the second resistor is connected in parallel with the third capacitor.
In some embodiments, the isolation feedback unit includes a photo coupler, a third resistor, a fourth resistor, a fifth resistor, and a fourth capacitor; the first input end of the photoelectric coupler is connected with a reference voltage source through a third resistor, the second input end of the photoelectric coupler is connected with the output ends of the current comparison unit and the voltage comparison unit, and the fourth resistor is connected between the first input end and the second input end of the photoelectric coupler; the first output end of the photoelectric coupler is connected with the control module and is connected with the positive electrode of the voltage transformation output end through a fifth resistor, and when the photoelectric coupler is conducted, a feedback signal is output to the control module; the second output end of the photoelectric coupler is connected with the negative electrode of the voltage transformation output end, and the fourth capacitor is connected between the first output end and the second output end of the photoelectric coupler.
In a second aspect, an embodiment of the present application further provides an energy storage device, which includes the charging circuit in any embodiment of the present application, and an energy storage battery connected to an output end of the charging circuit.
The application provides a charging circuit and energy storage equipment, wherein the charging circuit comprises a voltage transformation module, a switch module, a feedback module and a control module; the transformation module is used for converting the electric signal output by the power supply and outputting the electric signal through a transformation output end; the switch module is connected with the power supply and the transformation module and is used for disconnecting the connection between the transformation module and the power supply according to the turn-off control signal; the input end of the feedback module is connected with the voltage transformation output end and is used for sampling the power supply current and the power supply voltage output by the voltage transformation output end, comparing the sampled current obtained by sampling with the reference current and comparing the sampled voltage obtained by sampling with the reference voltage; the feedback module is also used for outputting a feedback signal when the sampling voltage is greater than the reference voltage or the sampling current is greater than the reference current; the control module is used for outputting a turn-off control signal to the switch module under the condition of receiving a feedback signal, the charging circuit provided by the application converts an electric signal output by a power supply through the voltage transformation module and outputs the electric signal through the voltage transformation output end, the feedback module is used for collecting a power supply current and a power supply voltage output by the voltage transformation output end and comparing the power supply current with a reference current, the power supply voltage is compared with the reference voltage, the reference current and the reference voltage are adjustable, the feedback signal is output when the power supply voltage is greater than the reference voltage or the power supply current is greater than the reference current, the turn-off frequency and the turn-off duty ratio of the switch module are controlled according to the generation frequency of the feedback signal, the adjustment of the voltage or the current output by the voltage transformation output end of the voltage transformation module is realized by using the turn-off frequency and the turn-off duty ratio of the switch module, the charging circuit has stronger adaptability, the corresponding voltage or current can be output according to the actual charging requirement, and the user experience is effectively improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic block diagram of an application scenario of an energy storage device according to an embodiment of the present disclosure;
fig. 2 is a schematic block diagram of a circuit structure corresponding to a charging circuit of an energy storage device in an embodiment of the present application;
FIG. 3 is a circuit diagram illustrating an exemplary embodiment of a voltage reference unit in a charging circuit;
fig. 4A is a schematic circuit block diagram of a current reference unit in the charging circuit provided in the present application;
FIG. 4B is a circuit diagram of one embodiment of a current reference cell;
FIG. 5 is a circuit diagram of one embodiment of a feedback module in a charging circuit;
fig. 6 is a schematic circuit diagram of an embodiment of a current sampling unit in a charging circuit.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the descriptions in this application referring to "first", "second", etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.
In the description of the present application, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The flow diagrams depicted in the figures are merely illustrative and do not necessarily include all of the elements and operations/steps, nor do they necessarily have to be performed in the order depicted. For example, some operations/steps may be decomposed, combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.
Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Referring to fig. 1, fig. 1 is a diagram illustrating an energy storage device 100 according to an embodiment of the present disclosure, where the energy storage device 100 includes a charging circuit 10 and a load 30, where the load 30 includes, but is not limited to, an energy storage battery. When the energy storage device 100 needs to be charged, the charging circuit 10 is connected to the power supply 20, so that the power supply 20 supplies power to the load 30 through the charging circuit 10, and a user can set an output voltage or an output current corresponding to the charging circuit 10 according to a charging voltage or a charging current required by the load 30, so that the charging circuit 10 can be charged for corresponding adaptation after being connected to the power supply 20.
Referring to fig. 2, in some embodiments, the charging circuit 10 includes a transforming module 11, a switching module 12, a feedback module 13, and a control module 14. Specifically, the transforming module 11 is configured to convert an electrical signal output by the power supply 20 and output the electrical signal through a transforming output terminal to supply power to the corresponding load 30, where the electrical signal obtained by converting the electrical signal of the power supply 20 includes at least one of a power supply voltage and a power supply current. The switch module 12 is connected to the power supply 20 and the transforming module 11, and is configured to disconnect the connection between the transforming module 11 and the power supply 20 according to the shutdown control signal output by the control module 14. The input end of the feedback module 13 is connected with the voltage transformation output end, and is used for sampling the power supply current and the power supply voltage output by the voltage transformation output end, comparing the sampled current obtained by sampling with the reference current, and comparing the sampled voltage obtained by sampling with the reference voltage; and the feedback module 13 is further configured to output a feedback signal when the sampling voltage is greater than the reference voltage or the sampling current is greater than the reference current. The control module 14 is connected to the switch module 12 and the feedback module 13, and configured to output a turn-off control signal to the switch module 12 when receiving the feedback signal output by the feedback module 13.
It is understood that in the present embodiment, when the control module 14 does not receive the feedback signal, the control module 14 controls the switch module 12 to be turned on or off according to the normal operation mode. The control module 14 may be powered by the power supply 20 or the auxiliary power supply 40, which is not limited herein.
It can be understood that there may be a plurality of voltage transformation output terminals of the voltage transformation module 11, and the voltage values output by different voltage transformation output terminals are different. For example, the transformer module 11 has a primary winding and N secondary windings, where N is greater than or equal to 2, and voltages output by different secondary windings are different, for example, when N is equal to 4, voltages output by 4 secondary windings are 5V, 18V, 24V, and 36V, and different voltage levels may supply power to different loads or electrical devices.
Illustratively, the power supply 20 is a dc power supply, and the power supply 20 is also used for supplying power to the control module 14, for example, the power supply 20 is a photovoltaic power supply. After the charging circuit 10 is connected to the power supply 20, the charging circuit 10 starts to operate, and at the same time, the power supply 20 supplies power to the control module 14, so that the control module 14 controls the switch module 12 to be turned on, and thus the voltage transformation module 11 and the power supply 20 are connected in a conductive manner, so that the voltage transformation module 11 starts to operate, and outputs a corresponding electrical signal through the voltage transformation output end to supply power to the load 30.
After the transformer module 11 starts to work, the feedback module 13 samples the power supply current and the power supply voltage output by the transformer output end, compares the sampled current with the reference current, compares the sampled voltage with the reference voltage, and when the sampled voltage is greater than the reference voltage or the sampled current is greater than the reference current, the feedback module 13 outputs a feedback signal to the control module 14, so that the control module 14 outputs a turn-off control signal to the switch module 12.
At least one of the reference voltage or the reference current is adjustable, so that the feedback module 13 can output a feedback signal to control the turn-off frequency and the turn-off duty ratio of the switch module 12 according to the adjustment of the corresponding reference voltage or the corresponding reference current, and the adjustment of the voltage or the current output by the voltage transformation output end of the voltage transformation module 11 is realized by using the turn-off frequency and the turn-off duty ratio of the switch module 12, so that the charging circuit 10 has stronger adaptability, the corresponding voltage or the corresponding current can be output according to the actual charging requirement, and the user experience is effectively improved.
For example, when a load 30 (such as an energy storage battery) connected to the transforming module 11 needs to realize fast charging, and the current range of the fast charging is 10A-30A, but the charging voltage can only be 20V at most, at this time, the effect that the charging voltage can be controlled at 20V while the current can be changed can be realized by adjusting the reference current value, the on/off frequency and the duty ratio of the switching module 12.
Similarly, when a load 30 (such as an energy storage battery) connected to the voltage transformation module 11 needs to be charged, and the charging voltage range is 10V-30V, but the charging current is only 20A at most, the charging current can be controlled to be 20A by adjusting the reference voltage value, the on/off frequency and the duty ratio of the switch module 12, and the charging voltage can be changed.
In some embodiments, the charging circuit 20 further includes a reference module 15, which is connected to the feedback module 13 and is used for providing a reference voltage and a reference current to the feedback module 13.
Specifically, the reference module 15 includes a voltage reference unit 151 and a current reference unit 152. The voltage reference unit 151 is connected to the feedback module 13, and configured to receive a voltage setting signal and output a reference voltage reference V according to the voltage setting signal. The current reference unit 152 is connected to the feedback module 13, and is configured to receive the current setting signal and output a reference current according to the current setting signal. That is, the reference current input by the feedback module 13 may be adjusted by the current setting signal, the reference voltage input by the feedback module 13 may be adjusted by the voltage setting signal, and the voltage setting signal and the current setting signal may be adjusted according to the charging voltage or the charging current required by the load 30.
It is to be understood that in some embodiments, at least one of the current setting signal or the voltage setting signal is adjustable. Specifically, taking the example that the current setting signal is adjustable, the current setting signal may be output to the reference module 15 by operating an input device when a user knows the charging voltage or the charging current required by the load 30, or the load management circuit monitors the power input state of the load 30 and dynamically adjusts the charging voltage or the charging current required by the load 30 according to the power input state, so as to adjust the corresponding current setting signal.
For example, the load 30 is taken as an energy storage battery, and the load management circuit is taken as a BMS circuit. The electric energy input state of the energy storage battery is monitored through the BMS circuit, and the charging voltage or the charging current required by the load 30 is adjusted according to the electric energy input state, so that the corresponding current setting signal is adjusted, and the adjustment of the reference voltage and the reference current provided to the feedback module 13 is further realized. When the charging circuit 10 works, the corresponding reference current is adjusted to enable the feedback module 13 to output a feedback signal so as to control the turn-off frequency and the turn-off duty ratio of the switch module 12, so that the adjustment of the voltage or the current output by the voltage transformation output end of the voltage transformation module 11 is realized by using the turn-off frequency and the turn-off duty ratio of the switch module 12, and the charging voltage or the charging current of the energy storage battery is adjusted.
Referring to fig. 3, in some embodiments, the voltage reference unit 151 includes a first voltage dividing element R173, a second voltage dividing element R174, a controllable precision regulator U17, and a first capacitor C152. A first end of the first voltage dividing element R173 is connected to an input end of the voltage reference unit 151, for example, the first end of the first voltage dividing element R173 is connected to a transforming output end SRC of the transforming module 11, a second end of the first voltage dividing element R173 is connected to an output end of the voltage reference unit 151 and a cathode (C) of the controllable precision voltage regulator U17, and the second voltage dividing element R174 is connected to the first voltage dividing element R173 in parallel; the cathode (C) of the controllable precise voltage-stabilizing source U17 is connected with the output end of the voltage reference unit 151; the reference pole (R) of the controllable precision regulator U17 is connected to the output end of the voltage reference unit 151, for example, the reference pole (R) of the controllable precision regulator U17 is connected to the input end of the feedback module 13 to output the reference voltage reference V. The anode (A) of the controllable precise voltage-stabilizing source U17 is grounded; the first capacitor C152 is connected between the reference pole (R) and the anode (a) of the controllable precision regulator U17. Preferably, the controllable precise voltage-stabilizing source U17 is a TL431 controllable precise voltage-stabilizing source.
Referring to fig. 4A and 4B, in some embodiments, the current reference unit 152 includes a rectifying sub-unit 1521, a first comparator U18B, and a voltage divider sub-unit 1523. The input end of the rectifying subunit 1521 is connected to the input end of the current reference unit 152, the output end of the rectifying subunit 1521 is connected to the first input end of the first comparator U18B, and the rectifying subunit 1521 is configured to receive the current setting signal, rectify the current setting signal, and output the current setting signal to the first comparator U18B. A second input end of the first comparator U18B is connected to an output end of the first comparator U18B, and the first comparator U18B is configured to receive the current setting signal rectified by the rectifier sub-unit 1521, and output a comparison signal to the voltage divider sub-unit 1523. The voltage dividing subunit 1523 is configured to output a reference current after dividing the voltage of the comparison signal. In this embodiment, the non-inverting input terminal of the first comparator U18B serves as the first input terminal of the first comparator U18B, and the inverting input terminal of the first comparator U18B serves as the inverting input terminal of the first comparator U18B.
As shown in fig. 4B, specifically, the rectifying sub-unit 1521 includes a first rectifying resistor R185, a second rectifying resistor R186, a first rectifying capacitor C157 and a second rectifying capacitor C158, wherein a first end of the first rectifying resistor R185 is connected to the input terminal of the rectifying sub-unit 1521, a second end of the first rectifying resistor R185 is grounded through the first rectifying capacitor C157 and connected to the first input terminal of the first comparator U18B through the second rectifying resistor R186, a first end of the second rectifying capacitor C158 is connected to the first input terminal of the first comparator U18B, a second end of the second rectifying capacitor C158 is grounded, and the voltage divider sub-unit 1523 at least includes a voltage dividing resistor R186.
After the current setting signal (e.g., PWM signal) is rectified by the rectifier sub-unit 1521 to output the current setting signal to the first comparator U18B, so that the first comparator U18B outputs the comparison signal to the voltage divider sub-unit 1523, so that the voltage divider sub-unit 1523 divides the comparison signal and outputs the reference current reference I.
Referring to fig. 5, in some embodiments, the feedback module 13 includes a current sampling unit 131, a voltage sampling unit 132, a current comparing unit 133, a voltage comparing unit 134, and an isolation feedback unit 135.
The current sampling unit 131 is connected to the transformer module 11, and is configured to collect a supply current output from the transformer output terminal to the load 30, convert the supply current into a sampling current, and output the sampling current to the first input terminal of the current comparing unit 133. The second input terminal of the current comparing unit 133 is connected to the current reference unit 152, the output terminal of the current comparing unit 133 is connected to the input terminal of the isolation feedback unit 135, and the current comparing unit 133 is configured to output the first conduction control signal to the isolation feedback unit 135 when the sampling current is greater than the reference current. The voltage sampling unit 132 is connected to the voltage transformation module 11, and is configured to collect a power supply voltage and output a sampling voltage to a first input end of the voltage comparison unit 134; a second input terminal of the voltage comparing unit 134 is connected to the voltage reference unit, an output terminal of the voltage comparing unit 134 is connected to an input terminal of the isolation feedback unit 135, and the voltage comparing unit 134 is configured to output a second conduction control signal to the isolation feedback unit 135 when the sampling voltage is greater than the reference voltage. The isolation feedback unit 135 is connected to the control module 14, and configured to output a feedback signal to the control module 14 when receiving the first conduction control signal or the second conduction control signal.
Referring to fig. 6, in some embodiments, the current sampling unit 131 includes a first voltage dividing element R190, a second voltage dividing element R192, a third voltage dividing element R191, a first filtering module 1311, a second filtering module 1312, and a first comparator U19B.
The first input terminal of the first comparator U19B is connected to the transformation output terminal of the transformation module 11 through the first voltage dividing element R190, for example, the first input terminal of the first comparator U19B is connected to the negative electrode of the transformation output terminal through the first voltage dividing element R190. A second input terminal of the first comparator U19B is grounded through the second voltage dividing element R192, and an output terminal of the first comparator U19B is connected to the first input terminal of the current comparing unit 13 through a second terminal of the third voltage dividing element R191. A first terminal of the first filter module 1311 is grounded, and a second terminal of the first filter module 1311 is connected to a first input terminal of the first comparator U19B. A first end of the second filtering module 1312 is connected to the second input end of the first comparator U19B and the second end of the second voltage dividing element R192, and a second end of the second filtering module 1312 is connected to the output end of the first comparator U19B and the first end of the third voltage dividing element (191).
In the current sampling unit 131, the voltage output from the transformer output terminal is amplified by the first comparator U19B, and then the sampled current I _ BAT is output to the current comparison circuit 133.
Preferably, the first filtering module 1311 and the second filtering module 1312 are both RC filtering modules, and the RC filtering modules at least include a filtering resistor and a filtering capacitor connected in parallel with the filtering resistor.
As shown in fig. 5, in some embodiments, the voltage sampling unit 132 includes a fourth voltage dividing element R187, a fifth voltage dividing element R194, and a sixth voltage dividing element R195, wherein a first end of the fourth voltage dividing element R187 is connected to a positive electrode of a voltage transforming output end of the voltage transforming module 11, for example, when the voltage transforming output end is used for connecting to a positive electrode of the load 30, the first end of the fourth voltage dividing element R187 is connected to a positive electrode P + of the load 30. The second end of the fourth voltage dividing element R187 is connected to the input end of the voltage comparing unit 134, and the second end of the fourth voltage dividing element R187 is grounded through the fifth voltage dividing element R194; the sixth voltage dividing element R195 is connected in parallel with the fifth voltage dividing element R194.
As shown in fig. 5, in some embodiments, the current comparing unit 133 includes a second comparator U18A, a first diode D45, a first resistor R175, a second resistor R176, a second capacitor C153, and a third capacitor C154. A first input terminal of the second comparator U18A is connected to the current reference unit 152, and is configured to receive the reference current output by the current reference unit 152. A second input terminal of the second comparator U18A is connected to the output terminal of the current sampling unit 131, and is configured to receive the sampling current output by the current sampling unit 131. In this embodiment, the non-inverting input of the second comparator U18A serves as the first input of the first comparator U18A, and the inverting input of the second comparator U18A serves as the inverting input of the second comparator U18A.
The output end of the second comparator U18A is connected with the output end of the first diode D45, and is connected with the input end of the isolation feedback unit 135 through the input end of the first diode D45; a first end of the first resistor R175 is connected to the output end of the second comparator U18A, a second end of the first resistor R175 is connected to a first end of the second capacitor, and a second end of the second capacitor is connected to a second input end of the second comparator U18A; a first end of the third capacitor C154 is connected to the output end of the second comparator U18A, and a second end of the third capacitor C154 is connected to the second input end of the second comparator U18A; the second resistor R176 is connected in parallel with the third capacitor C154.
Preferably, the voltage comparing unit 134 and the current comparing unit 133 have the same structure.
As shown in fig. 5, in some embodiments, the isolation feedback unit 135 includes a photo coupler U20, a third resistor R181, a fourth resistor R189, a fifth resistor R180, and a fourth capacitor C158. A first input end of the photoelectric coupler U20 is connected to a reference voltage source through a third resistor R181, in this embodiment, the reference voltage source may be an independent power source, or an output end of a secondary winding of the voltage transformation module 11, a second input end of the photoelectric coupler U20 is connected to output ends of the current comparison unit 133 and the voltage comparison unit 134, and a fourth resistor R189 is connected between the first input end and the second input end of the photoelectric coupler U20; the first output end of the photoelectric coupler U20 is connected to the control module 14, and is connected to the positive electrode of the voltage transformation output end of the voltage transformation module 11 through the fifth resistor R180, and when the photoelectric coupler U20 is turned on, a feedback signal is output to the control module 14.
The second output end of the photoelectric coupler U20 is connected to the negative electrode of the transformation output end of the transformation module 11, and a fourth capacitor C158 is connected between the first output end and the second output end of the photoelectric coupler U20.
Through setting up optoelectronic coupler U20 can realize the isolation feedback between the voltage side of the voltage transformation output of voltage transformation module 11 and the high pressure side that power supply 20 corresponds, reinforcing circuit's reliability.
For example, when the sampling current collected by the feedback module 13 is greater than the reference current, the current comparing unit 133 outputs a low level to operate the photocoupler U20 of the isolation feedback unit 135, and outputs a feedback signal to the control module 14 to enable the control module 14 to control the switching module 12 to be turned off.
Or, when the sampling voltage collected by the feedback module 13 is greater than the reference voltage, the voltage comparing unit 134 outputs a low level to operate the photocoupler U20 of the isolation feedback unit 135, and outputs a feedback signal to the control module 14 to enable the control module 14 to control the switching module 12 to be turned off. Specifically, referring to fig. 5, when the current comparing unit 133 or the voltage comparing unit 134 outputs a low level, the reference voltage source, the photo coupler U20, the current comparing unit 133 or the voltage comparing unit 134 form a loop, and the photo coupler U20 is turned on. As shown in fig. 5, the feedback signal received by the control module 14 is a ground signal when the photocoupler U20 is turned on, that is, the feedback signal is a low level signal.
When the current comparing unit 133 and the voltage comparing unit 134 output high levels, the photo-coupler U20 of the isolation feedback unit 135 stops operating. At this time, as shown in fig. 5, the signal received by the control module 14 is a voltage signal obtained by dividing the voltage input by the SRC by R180, and the voltage signal is a high level signal, so that the control module 14 normally controls the switch module 12 to be turned on or off according to actual settings. In this embodiment, the feedback signal is a low level signal.
Therefore, at least one of the reference voltage or the reference current is adjustable, so that the feedback module 13 can output the feedback signal to control the turn-off frequency and the duty ratio of the switch module 12 according to the adjustment of the corresponding reference voltage or the corresponding reference current, and the adjustment of the voltage or the current output by the transformation output end of the transformation module 11 is realized by using the turn-off frequency and the turn-off duty ratio of the switch module 12, so that the charging circuit 10 has stronger adaptability, can output the corresponding voltage or current according to the actual charging requirement, and effectively improve the user experience.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A charging circuit, comprising:
the voltage transformation module is used for converting the electric signal output by the power supply and outputting the electric signal through a voltage transformation output end;
the switch module is connected with the power supply and the transformation module and is used for disconnecting the connection between the transformation module and the power supply according to a turn-off control signal;
the input end of the feedback module is connected with the voltage transformation output end and is used for sampling the power supply current and the power supply voltage output by the voltage transformation output end, comparing the sampled current obtained by sampling with the reference current and comparing the sampled voltage obtained by sampling with the reference voltage; the feedback module is further used for outputting a feedback signal when the sampling voltage is greater than the reference voltage or the sampling current is greater than the reference current;
and the control module is connected with the switch module and the feedback module and used for outputting the turn-off control signal to the switch module under the condition of receiving the feedback signal.
2. The charging circuit of claim 1, further comprising a reference module coupled to the feedback module for providing the reference voltage and the reference current to the feedback module.
3. The charging circuit of claim 2, wherein the reference module comprises a voltage reference unit and a current reference unit;
the voltage reference unit is connected with the feedback module and used for receiving a voltage setting signal and outputting the reference voltage according to the voltage setting signal;
and the current reference unit is connected with the feedback module and used for receiving a current setting signal and outputting the reference current according to the current setting signal.
4. The charging circuit according to claim 3, wherein the voltage reference unit comprises a first voltage dividing element, a second voltage dividing element, a controllable precision voltage regulator and a first capacitor;
the first end of the first voltage division element is connected with the input end of the voltage reference unit, the second end of the first voltage division element is connected with the output end of the voltage reference unit and the cathode of the controllable precise voltage stabilizing source, and the second voltage division element is connected with the first voltage division element in parallel;
the cathode of the controllable precise voltage stabilizing source is connected with the output end of the voltage reference unit;
the reference electrode of the controllable precise voltage-stabilizing source is connected with the output end of the voltage reference unit, and the anode of the controllable precise voltage-stabilizing source is grounded;
the first capacitor is connected between the reference electrode and the anode of the controllable precise voltage stabilizing source.
5. The charging circuit of claim 3, wherein the current reference unit comprises a rectifying subunit, a first comparator and a voltage dividing subunit;
the input end of the rectifier subunit is connected with the input end of the current reference unit, the output end of the rectifier subunit is connected with the first input end of the first comparator, and the rectifier subunit is used for receiving the current setting signal, rectifying the current setting signal and outputting the current setting signal to the first comparator;
the second input end of the first comparator is connected with the output end of the first comparator, and the first comparator is used for receiving the current setting signal rectified by the rectifier subunit and outputting a comparison signal to the voltage divider subunit;
and the voltage dividing subunit is used for outputting the reference current after dividing the voltage of the comparison signal.
6. The charging circuit of claim 3, wherein the feedback module comprises a current sampling unit, a voltage sampling unit, a current comparing unit, a voltage comparing unit and an isolation feedback unit;
the current sampling unit is connected with the voltage transformation module and is used for collecting the power supply current and outputting a sampling current to the first input end of the current comparison unit;
the second input end of the current comparison unit is connected with the current reference unit, the output end of the current comparison unit is connected with the input end of the isolation feedback unit, and the current comparison unit is used for outputting a first conduction control signal to the isolation feedback unit when the sampling current is greater than the reference current;
the voltage sampling unit is connected with the voltage transformation module and is used for collecting the power supply voltage and outputting a sampling voltage to a first input end of the voltage comparison unit;
the second input end of the voltage comparison unit is connected with the voltage reference unit, the output end of the voltage comparison unit is connected with the input end of the isolation feedback unit, and the voltage comparison unit is used for outputting a second conduction control signal to the isolation feedback unit when the sampling voltage is greater than the reference voltage;
the isolation feedback unit is connected with the control module and used for outputting the feedback signal to the control module when receiving the first conduction control signal or the second conduction control signal.
7. The charging circuit of claim 6, wherein the current sampling unit comprises a first voltage dividing element, a second voltage dividing element, a third voltage dividing element, a first filtering module, a second filtering module, and a first comparator;
the first input end of the first comparator is connected with the negative electrode of the transformation output end through the first voltage division element; a second input end of the first comparator is grounded through the second voltage division element; the output end of the first comparator is connected with the first input end of the current comparison unit through the second end of the third voltage division element;
the first end of the first filtering module is grounded, and the second end of the first filtering module is connected with the first input end of the first comparator;
the first end of the second filtering module is connected with the second input end of the first comparator and the second end of the second voltage division element, and the second end of the second filtering module is connected with the output end of the first comparator and the first end of the third voltage division element.
8. The charging circuit of claim 6, wherein the current comparing unit comprises a second comparator, a first diode, a first resistor, a second capacitor, and a third capacitor;
a first input end of the second comparator is connected with the current reference unit, a second input end of the second comparator is connected with an output end of the current sampling unit, and an output end of the second comparator is connected with an output end of the first diode and is connected with an input end of the isolation feedback unit through an input end of the first diode;
a first end of the first resistor is connected with an output end of the second comparator, a second end of the first resistor is connected with a first end of the second capacitor, and a second end of the second capacitor is connected with a second input end of the second comparator;
a first end of the third capacitor is connected with an output end of the second comparator, and a second end of the third capacitor is connected with a second input end of the second comparator;
the second resistor is connected in parallel with the third capacitor.
9. The charging circuit of claim 6, wherein the isolation feedback unit comprises a photocoupler, a third resistor, a fourth resistor, a fifth resistor and a fourth capacitor;
the first input end of the photoelectric coupler is connected with a reference voltage source through the third resistor, the second input end of the photoelectric coupler is connected with the output ends of the current comparison unit and the voltage comparison unit, and the fourth resistor is connected between the first input end and the second input end of the photoelectric coupler;
the first output end of the photoelectric coupler is connected with the control module and is connected with the positive electrode of the voltage transformation output end through the fifth resistor, and when the photoelectric coupler is conducted, the feedback signal is output to the control module;
the second output end of the photoelectric coupler is connected with the negative electrode of the voltage transformation output end, and the fourth capacitor is connected between the first output end and the second output end of the photoelectric coupler.
10. An energy storage device, comprising: a charging circuit as claimed in any one of claims 1 to 9, and an energy storage battery connected to an output of the charging circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220852437.8U CN217692701U (en) | 2022-04-13 | 2022-04-13 | Charging circuit and energy storage equipment |
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| CN202220852437.8U CN217692701U (en) | 2022-04-13 | 2022-04-13 | Charging circuit and energy storage equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116545083A (en) * | 2023-06-27 | 2023-08-04 | 荣耀终端有限公司 | Charging circuit, electronic equipment and power adapter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116545083A (en) * | 2023-06-27 | 2023-08-04 | 荣耀终端有限公司 | Charging circuit, electronic equipment and power adapter |
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