CN109274153B - Temperature compensation circuit for charging energy storage module and charger - Google Patents

Temperature compensation circuit for charging energy storage module and charger Download PDF

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CN109274153B
CN109274153B CN201811342571.8A CN201811342571A CN109274153B CN 109274153 B CN109274153 B CN 109274153B CN 201811342571 A CN201811342571 A CN 201811342571A CN 109274153 B CN109274153 B CN 109274153B
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charging
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林引胜
臧思田
武晋波
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Tianjin Aviation Mechanical and Electrical Co Ltd
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Tianjin Aviation Mechanical and Electrical Co Ltd
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Abstract

The embodiment of the invention discloses a temperature compensation circuit and a charger for charging an energy storage module, wherein the temperature compensation circuit for charging the energy storage module comprises a temperature detection circuit and a feedback voltage compensation circuit, wherein the temperature detection circuit is used for detecting the temperature of the energy storage module and converting the temperature into a first voltage signal; and the feedback voltage compensation circuit is used for detecting the charging voltage of the energy storage module, compensating the charging voltage according to the first voltage signal, and outputting the compensated charging voltage as the feedback voltage. The technical scheme provided by the embodiment of the invention can adaptively compensate the feedback voltage according to the change of the environmental temperature so as to achieve the effect of compensating the charging voltage of the energy storage module, thereby solving the problems that the charging quantity of the energy storage module is insufficient in a low-temperature environment and overvoltage charging is easy to occur in a high-temperature environment.

Description

Temperature compensation circuit for charging energy storage module and charger
Technical Field
The embodiment of the invention relates to the technical field of power supplies, in particular to a temperature compensation circuit and a charger for charging an energy storage module.
Background
The rechargeable battery is used as a power supply of various electric equipment, has the advantages of economy, environmental protection, enough electric quantity, suitability for high power and long-time use, and is widely used, such as a smart phone, a tablet personal computer, a notebook computer, intelligent wearable equipment, an electric vehicle, an electric automobile and the like.
The existing chargers are various in types and poor in charging performance. Generally, a fixed voltage charging mode is adopted to charge the rechargeable battery, but the influence of the ambient temperature on the charging process of the rechargeable battery and the capacity of the rechargeable battery is large, so that the problems that the rechargeable battery is insufficient in charging capacity in a low-temperature environment and is easy to generate overvoltage charging in a high-temperature environment exist, and the service life of the rechargeable battery is shortened.
Disclosure of Invention
The embodiment of the invention provides a temperature compensation circuit and a charger for charging an energy storage module, which can adaptively compensate feedback voltage according to the temperature change of the energy storage module so as to achieve the effect of compensating the charging voltage of the energy storage module, and solve the problems that the charging process of the conventional rechargeable battery is greatly influenced by temperature, the rechargeable battery is insufficient in charging electric quantity in a low-temperature environment, and overvoltage charging is easy to occur in a high-temperature environment so as to cause the service life of the battery to be reduced.
In order to realize the technical problem, the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a temperature compensation circuit for charging an energy storage module, including: the temperature detection circuit is used for detecting the temperature of the energy storage module and converting the temperature into a first voltage signal;
the feedback voltage compensation circuit comprises a first input end, a detection end and an output end, wherein the first input end of the feedback voltage compensation circuit is electrically connected with the output end of the temperature detection circuit, the feedback voltage compensation circuit is used for detecting the charging voltage of the energy storage module, compensating the charging voltage according to a first voltage signal, and outputting the compensated charging voltage as the feedback voltage.
Furthermore, the temperature compensation circuit for charging the energy storage module further comprises an amplitude limiting circuit, wherein the amplitude limiting circuit comprises a first input end, an upper limit input end, a lower limit input end and an output end;
the first input end of the amplitude limiting circuit is electrically connected with the output end of the temperature detection circuit, the output end of the amplitude limiting circuit is electrically connected with the first input end of the feedback voltage compensation circuit, the amplitude limiting circuit is used for receiving an upper limit value and a lower limit value, if the first voltage signal is between the upper limit value and the lower limit value, the first voltage signal is output, if the first voltage signal is greater than the upper limit value, the first voltage signal is clamped to the upper limit value and output, and if the first voltage signal is smaller than the lower limit value, the first voltage signal is clamped to the lower limit value and output;
the feedback voltage compensation circuit is used for compensating the charging voltage according to the first voltage signal processed by the amplitude limiting circuit, and outputting the compensated charging voltage as the feedback voltage.
Further, the amplitude limiting circuit comprises a first operational amplifier, a second operational amplifier, a first diode, a second diode and a voltage follower;
the non-inverting input end of the first operational amplifier is electrically connected with the upper limit input end of the amplitude limiting circuit, the inverting input end of the first operational amplifier, the first input end of the amplitude limiting circuit and the anode of the first diode are electrically connected with the input end of the voltage follower, and the output end of the first operational amplifier is electrically connected with the cathode of the first diode;
the non-inverting input end of the second operational amplifier is electrically connected with the lower limit input end of the amplitude limiting circuit, the inverting input end of the second operational amplifier, the first input end of the amplitude limiting circuit and the cathode of the second diode are electrically connected with the input end of the voltage follower, and the output end of the second operational amplifier is electrically connected with the anode of the second diode;
the output end of the voltage follower is electrically connected with the output end of the amplitude limiting circuit.
Furthermore, the temperature compensation circuit for charging the energy storage module further comprises an upper limit generating circuit and a lower limit generating circuit, wherein the upper limit generating circuit and the lower limit generating circuit comprise a control end, an upper limit output end and a lower limit output end;
the upper limit output end and the lower limit output end of the upper limit generating circuit and the lower limit output end of the lower limit generating circuit are respectively electrically connected with the upper limit input end and the lower limit input end of the amplitude limiting circuit, and the upper limit generating circuit and the lower limit generating circuit are used for receiving the charging mode control signal and switching the output upper limit value and/or lower limit value according to the charging mode control signal.
Further, the upper and lower limit generating circuit comprises a first voltage stabilizing power supply, a voltage dividing resistor network and a first switch module;
wherein the voltage dividing resistor network comprises at least three resistors,
the first voltage-stabilizing power supply is electrically connected with the upper limit output end of the upper and lower limit generating circuit,
the first end of the voltage-dividing resistance network is electrically connected with the first voltage-stabilizing power supply, the second end of the voltage-dividing resistance network is electrically connected with the lower limit output end of the upper and lower limit generating circuit, the third end of the voltage-dividing resistance network is grounded,
the control end of the first switch module is electrically connected with the control ends of the upper and lower limit generating circuits, and the first end and the second end of the first switch module are electrically connected with the divider resistor network;
the first switch module is used for being switched on or switched off under the action of a charging mode control signal received by the control end of the first switch module so as to adjust the voltage proportion of the first end and the second end of the divider resistance network.
Further, the feedback voltage compensation circuit further comprises a control end, and the feedback voltage compensation circuit is further configured to receive the charging mode control signal and switch a mode for compensating the charging voltage according to the charging mode control signal.
Further, the feedback voltage compensation circuit includes: a first resistor, a second resistor, and a second resistor network,
wherein the second resistive network comprises at least one resistor,
a first input end of the feedback voltage compensation circuit is electrically connected with a first end of the second resistor network through a first resistor;
the detection end of the feedback voltage compensation circuit is electrically connected with the first end of the second resistor network through a second resistor;
the second end of the second resistor network is grounded, and the third end of the second resistor network is electrically connected with the output end of the feedback voltage compensation circuit.
Further, the feedback voltage compensation circuit further includes: a second switching module, the second resistor network comprising at least two resistors,
the control end of the second switch module is electrically connected with the control end of the feedback voltage compensation circuit, and the first end and the second end of the second switch module are electrically connected with the second resistor network;
the second switch module is used for being switched on or switched off under the action of the charging mode control signal received by the control end of the second switch module so as to adjust the current flowing state of part of resistors in the second resistor network.
Further, the second resistor network includes a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor,
the first end of the second resistor network is electrically connected with the second end of the second resistor network through a third resistor, the first end of the second resistor network is electrically connected with the third end of the second resistor network through a fourth resistor, the third end of the second resistor network is electrically connected with the second end of the second resistor network through a fifth resistor, the third end of the second resistor network is electrically connected with the first end of the second switch module through a sixth resistor, and the second end of the second switch module is electrically connected with the second end of the second resistor network.
Further, the charging mode control signal includes at least one of: a constant voltage charging mode control signal and a floating charging mode control signal.
Furthermore, the temperature detection circuit comprises a temperature change resistor, a seventh resistor, an eighth resistor, a first power supply and a controllable voltage-stabilizing source,
the first end of the controllable voltage-stabilizing source is electrically connected with the second end of the controllable voltage-stabilizing source through a temperature-changing resistor, the first end of the controllable voltage-stabilizing source is electrically connected with the third end of the controllable voltage-stabilizing source through a seventh resistor, the first power supply is electrically connected with the second end of the controllable voltage-stabilizing source through an eighth resistor, the third end of the controllable voltage-stabilizing source is grounded, and the second end of the controllable voltage-stabilizing source is electrically connected with the output end of the temperature detection circuit.
In a second aspect, the embodiment of the present invention further provides a charger, which includes a main circuit topology, a feedback control circuit, and the temperature compensation circuit for charging the energy storage module provided in the first aspect,
wherein, the input end of the main circuit topology is electrically connected with the input end of the charger, the output end of the main circuit topology is electrically connected with the output end of the charger,
the detection end of the feedback voltage compensation circuit is electrically connected with the output end of the charger;
the output end of the feedback voltage compensation circuit is electrically connected with the feedback input end of the feedback control circuit;
the output end of the feedback control circuit is electrically connected with the control end of the main circuit topology;
the feedback control circuit is used for obtaining and outputting a control signal according to the difference value of the reference voltage and the feedback voltage through a preset adjusting algorithm.
The embodiment of the invention provides a temperature compensation circuit for charging an energy storage module, which comprises a temperature detection circuit and a feedback voltage compensation circuit, wherein the feedback voltage compensation circuit comprises a first input end, a detection end and an output end, and the first input end of the feedback voltage compensation circuit is electrically connected with the output end of the temperature detection circuit. The temperature compensation circuit for charging the energy storage module detects the temperature of the energy storage module through the temperature detection circuit, converts the temperature into a first voltage signal, and feeds back a detection end of the voltage compensation circuit to be used for detecting the charging voltage of the energy storage module; the feedback voltage compensation circuit compensates the charging voltage according to the first voltage signal, and outputs the compensated charging voltage as a feedback voltage. The temperature compensation circuit for charging the energy storage module disclosed by the embodiment of the invention can adaptively compensate the feedback voltage according to the temperature change of the energy storage module so as to achieve the effect of compensating the charging voltage of the energy storage module, solve the problems that the energy storage module is insufficient in charging capacity in a low-temperature environment and easy to generate overvoltage charging in a high-temperature environment, and prolong the service life of the energy storage module.
Drawings
Fig. 1 is a schematic structural diagram of a temperature compensation circuit for charging an energy storage module according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a charger according to an embodiment of the present invention;
FIG. 3 is a block diagram of a feedback control provided by an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another temperature compensation circuit for charging an energy storage module according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another temperature compensation circuit for charging an energy storage module according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another temperature compensation circuit for charging an energy storage module according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a temperature detection circuit according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another temperature compensation circuit for charging an energy storage module according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another temperature compensation circuit for charging an energy storage module according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a main topology circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The embodiment of the invention provides a temperature compensation circuit for charging an energy storage module. Fig. 1 is a schematic structural diagram of a temperature compensation circuit for charging an energy storage module according to an embodiment of the present invention. The embodiment can be suitable for the condition of temperature compensation of energy storage module charging. The temperature compensation circuit for charging the energy storage module can be integrated in a charger. Referring to fig. 1, a temperature compensation circuit for charging an energy storage module according to an embodiment of the present invention includes a temperature detection circuit 1 and a feedback voltage compensation circuit 3.
The temperature detection circuit 1 is used for detecting the temperature of the energy storage module and converting the temperature into a first voltage signal; the feedback voltage compensation circuit 3 includes a first input terminal 31, a detection terminal 32 and an output terminal 33, the first input terminal 31 of the feedback voltage compensation circuit 3 is electrically connected to the output terminal 11 of the temperature detection circuit 1, the feedback voltage compensation circuit 3 is configured to detect a charging voltage of the energy storage module, compensate the detected charging voltage according to a first voltage signal, and output the compensated charging voltage as a feedback voltage.
The temperature detected by the temperature detection circuit 1 is equivalent to the ambient temperature of the energy storage module. The energy storage module may be a rechargeable battery. The energy storage module may include at least one of: lead-acid batteries, lithium batteries, nickel cadmium batteries and nickel hydrogen batteries. The temperature detected by the temperature detection circuit 1 and the first voltage signal converted therefrom may have a linear variation relationship. The first voltage signal may vary with a change in temperature of the energy storage module. The detection terminal 32 of the feedback voltage compensation circuit 3 is used for detecting the charging voltage actually output by the charger to the energy storage module. The feedback voltage compensation circuit 3 can receive a first voltage signal which is detected by the temperature detection circuit 1 and reflects the temperature of the energy storage module through a first input end 31 of the feedback voltage compensation circuit 3, the feedback voltage compensation circuit 3 can determine the compensation amount required by compensation of the detected charging voltage according to the charging voltage of the energy storage module detected by a detection end 32 of the feedback voltage compensation circuit 3, and then the sum or difference of the detected charging voltage and the compensation amount can be used as the feedback voltage to be output.
It should be noted that fig. 2 is a schematic structural diagram of a charger according to an embodiment of the present invention. The INPUT terminal INPUT of the charger 200 is electrically connected to the second power supply 300, and the OUTPUT terminal OUTPUT of the charger 200 is electrically connected to the energy storage module 100. Fig. 3 is a block diagram of a feedback control according to an embodiment of the present invention. Wherein, V ref Is a reference voltage, V det For the detected charging voltage of the energy storage module, Δ V 1 To compensate for, V f Is the feedback voltage. Compensation quantity DeltaV 1 Depending on the temperature. Referring to fig. 2 and 3, feedback control circuit 8 adjusts reference voltage V ref And a feedback voltage V f Difference value Δ V of 2 And obtaining and outputting a control signal through a preset adjusting algorithm. Wherein when the feedback control circuit reaches a steady state, Δ V 2 0 or Δ V 2 Approximately zero; and Δ V 2 ＝V ref -V f ＝V ref -(V det +ΔV 1 )＝(V ref -ΔV 1 )-V det Therefore, in steady state, the output voltage of the charger 200, i.e. the charging voltage V of the energy storage module 100 o ＝V det ＝V ref -ΔV 1 Therefore, temperature compensation is performed on the feedback voltage, which is equivalent to temperature compensation on the reference voltage, so that Δ V is reasonably set 1 With the relation of temperature, reach the purpose along with the charging voltage of energy storage module temperature variation adaptability compensation actual output to it is not enough to solve energy storage module electric quantity of charging under low temperature environment, and easily takes place the problem that excessive pressure charges under high temperature environment, and in addition, feedback control circuit is integrated chip usually, and inside has stable reference voltage, is difficult for changing, through increasing feedback voltage compensating circuit, but directly applicable to integrated chip, it is more convenient.
The embodiment of the invention provides a temperature compensation circuit for charging an energy storage module, which comprises a temperature detection circuit and a feedback voltage compensation circuit, wherein the feedback voltage compensation circuit comprises a first input end, a detection end and an output end, and the first input end of the feedback voltage compensation circuit is electrically connected with the output end of the temperature detection circuit. This a temperature compensation circuit for energy storage module charges detects energy storage module's temperature through temperature detection circuit to convert the temperature into first voltage signal, feedback voltage compensation circuit's sense terminal is used for detecting energy storage module's charging voltage, and feedback voltage compensation circuit compensates charging voltage according to first voltage signal, regards the charging voltage after will compensating as feedback voltage and exports. The temperature compensation circuit for charging the energy storage module disclosed by the embodiment of the invention can adaptively compensate the feedback voltage according to the temperature change of the energy storage module so as to achieve the effect of compensating the charging voltage of the energy storage module, solve the problems that the energy storage module is insufficient in charging capacity in a low-temperature environment and easy to generate overvoltage charging in a high-temperature environment, and prolong the service life of the energy storage module.
The embodiment of the invention provides a temperature compensation circuit for charging an energy storage module. Fig. 4 is a schematic structural diagram of another temperature compensation circuit for charging an energy storage module according to an embodiment of the present invention. On the basis of the above embodiment, the feedback voltage compensation circuit comprises a first resistor 35, a second resistor 36 and a second resistor network 37, wherein the second resistor network 37 comprises at least one resistor. The first input terminal 31 of the feedback voltage compensation circuit 3 is electrically connected to the first terminal 371 of the second resistor network 37 through the first resistor 35, the detection terminal 32 of the feedback voltage compensation circuit 3 is electrically connected to the first terminal 371 of the second resistor network 37 through the second resistor 36, the second terminal 372 of the second resistor network 37 is grounded, and the third terminal 373 of the second resistor network 37 is electrically connected to the output terminal 33 of the feedback voltage compensation circuit 3.
The correspondence relationship between the temperature of the energy storage module and the required charging voltage (usually, a curve relationship change, which may be approximately equivalent to a straight line relationship change) may be obtained according to the manual of the energy storage module 100, and may be, for example, V N ＝k 1 T+V j1 Wherein V is N The charging voltage required for the energy storage module 100, T is the ambient temperature, and k is the charging voltage required for the energy storage module after the type of the energy storage module is determined 1 And V j1 Will determine, i.e. k 1 Is a first known constant coefficient, V j1 Is a first known reference voltage. Reference voltage V of feedback control circuit 8 ref It is known thatWhen the feedback control circuit 8 reaches a steady state at a steady temperature, V ref ＝V f ，V N ＝V det . Fig. 4 exemplarily shows a case where the second resistor network 37 includes a third resistor 374, wherein the first terminal 371 of the second resistor network 37 is electrically connected to the second terminal 372 of the second resistor network 37 via the third resistor 374.
As shown in fig. 4, according to kirchhoff's current law,
Figure BDA0001862250500000041
wherein, V 11 Is the first voltage signal of the temperature detection circuit 11, i.e. the voltage at the first input 31 of the feedback voltage compensation circuit, R 1 Is the resistance value, R, of the first resistor 35 2 Is the resistance value, R, of the second resistor 36 3 Is the resistance value, V, of the third resistor 374 f For the feedback voltage, V, output by the output 33 of the feedback voltage compensation circuit det Is the detected charging voltage of the energy storage module 100, i.e. the voltage at the detection terminal 32 of the feedback voltage compensation circuit. The conversion relation between the first voltage signal and the temperature can be set as V 11 ＝k 2 T+V j2 Wherein k is 2 And V j2 Can be set according to the needs. Can be according to formula V N ＝k 1 T+V j1 ，V ref ＝V f ，V N ＝V det ，
Figure BDA0001862250500000051
V 11 ＝k 2 T+V j2 The proportional relationship among the first resistor 35, the second resistor 36 and the third resistor 374 can be determined, and then the resistance values of the first resistor 35, the second resistor 36 and the third resistor 374 meeting the requirements are determined, so that the temperature compensation of the charging voltage of the energy storage module is realized.
The embodiment of the invention provides a temperature compensation circuit for charging an energy storage module. Fig. 5 is a schematic structural diagram of another temperature compensation circuit for charging an energy storage module according to an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 5, the feedback voltage compensation circuit 3 further includes a control terminal 34, and the feedback voltage compensation circuit 3 is further configured to receive the charging mode control signal and switch the mode of compensating the charging voltage according to the charging mode control signal. Optionally, the charging mode control signal comprises at least one of: a constant voltage charging mode control signal and a floating charging mode control signal.
The charging mode of the energy storage module can comprise a constant voltage charging mode and a floating charging mode. In different charging modes of the energy storage module, the compensation relationship between the charging voltage required to be output by the charger and the temperature is different, that is, the compensation amount of the detected charging voltage is different, and the adopted compensation curves (representing the relationship between the temperature and the compensation amount) are different. The charging mode control signal can be a high level signal or a low level signal to correspond to different compensation modes.
It should be noted that, optionally, the charger further includes: and the constant voltage charging mode timer is used for outputting a trigger signal after the charger charges the energy storage module in the constant voltage charging mode for a preset time period. The charger further includes: and the current detection circuit is used for detecting the charging current of the energy storage module. The charger also comprises a charging mode control circuit which is used for outputting a floating charging mode control signal to the control end of the feedback voltage compensation circuit when receiving a trigger signal output by the constant voltage charging mode timer and/or monitoring that the charging current detected by the current detection circuit is lower than the charging current low limit value. The charger adopts a timing constant-voltage charging mode, namely, the constant-voltage charging mode is adopted in a preset time period, a constant-voltage charging mode control signal is output to the control end of the feedback voltage compensation circuit, and a trigger signal is output after the preset time period is reached.
Specifically, when the charging mode control signal received by the control terminal 34 of the feedback voltage compensation circuit 3 is a constant voltage charging mode control signal (which may be a low level, for example), the compensation curve is a constant voltage charging mode compensation curve; when the charging mode control signal received by the control terminal 34 of the feedback voltage compensation circuit 3 is a floating charging mode control signal (for example, it may be a high level), the compensation curve is a floating charging mode compensation curve, so as to determine a compensation amount according to a corresponding compensation curve and temperature in the current charging mode, thereby compensating the charging voltage output by the charger, and implementing accurate temperature compensation of the charging voltage of the energy storage module in different charging modes.
Optionally, referring to fig. 5, the feedback voltage compensation circuit 3 further comprises a second switch module 38, and the second resistor network 37 comprises at least two resistors. The control terminal 383 of the second switch module 38 is electrically connected to the control terminal 34 of the feedback voltage compensation circuit 3, the first terminal 381 and the second terminal 382 of the second switch module 38 are electrically connected to the second resistor network 37, and the second switch module 38 is configured to be turned on or off under the action of the charging mode control signal received by the control terminal 383 of the second switch module 38, so as to adjust the current flowing state of the part of resistors in the second resistor network 37.
The second switch module 38 may include a MOS transistor or a transistor. Fig. 5 exemplarily shows a case where the second switch module 38 includes an NMOS transistor. Fig. 5 exemplarily shows a case where the second resistor network 37 includes a third resistor 374 and a sixth resistor 377, wherein the third terminal 373 of the second resistor network 37 is electrically connected to the first terminal 381 of the second switch module 38 via the sixth resistor 377, and the second terminal 382 of the second switch module 38 is electrically connected to the second terminal 372 of the second resistor network 37.
The specific working principle is as follows: when the charging mode control signal received by the control terminal 34 of the feedback voltage compensation circuit 3 is a constant voltage charging mode control signal (for example, it may be a low level signal), that is, the charging mode is a constant voltage charging mode, the control terminal 383 of the second switch module 38 is a low level signal, the voltage between the control terminal 383 and the second terminal 382 of the second switch module 38 will be smaller than the on-threshold voltage of the second switch module 38, the voltage between the first terminal 381 and the second terminal 382 of the second switch module 38 will be turned off, no current flows through the sixth resistor 377, which is known from kirchhoff's current law,
Figure BDA0001862250500000061
the compensation curve of the constant voltage charging mode is V N ＝k 3 T+V j3 ，k 3 Is a third known constant coefficient, V j3 A third known reference voltage; when the control terminal 34 of the feedback voltage compensation circuit 3 receivesWhen the charging mode control signal is a floating charging mode control signal (for example, it may be a high level signal), that is, when the charging mode is a floating charging mode, the control terminal 383 of the second switch module 38 is a high level signal, the voltage between the control terminal 383 and the second terminal 382 of the second switch module 38 is greater than the turn-on threshold voltage of the second switch module 38, the first terminal 381 and the second terminal 382 of the second switch module 38 are turned on, the current flows through the sixth resistor 377, which is known from kirchhoff's current law,
Figure BDA0001862250500000062
wherein R is 6 Is the resistance of the sixth resistor 377, and the compensation curve of the floating charge mode is V N ＝k 4 T+V j4 ，k 4 Is a fourth known constant coefficient, V j4 Is a fourth known reference voltage (k) 3 ≠k 4 And/or, V j3 ≠V j4 ) Can be according to formula V N ＝k 3 T+V j3 ，V N ＝k 4 T+V j4 ，V ref ＝V f ，V N ＝V det ，V 11 ＝k 2 T+V j2 ，
Figure BDA0001862250500000063
The resistance values of the first resistor 35, the second resistor 36, the third resistor 374 and the sixth resistor 377 which meet the requirements can be determined, so that the temperature compensation of the charging voltage of the energy storage module in different charging modes can be realized.
The embodiment of the invention provides a temperature compensation circuit for charging an energy storage module. Fig. 6 is a schematic structural diagram of another temperature compensation circuit for charging an energy storage module according to an embodiment of the present invention. On the basis of the above embodiment, the temperature compensation circuit for charging the energy storage module further includes a limiting circuit 4, and the limiting circuit 4 includes a first input terminal 41, an upper limit input terminal 42, a lower limit input terminal 43, and an output terminal 44. The first input terminal 41 of the amplitude limiting circuit 4 is electrically connected to the output terminal 11 of the temperature detection circuit 1, the output terminal 44 of the amplitude limiting circuit 4 is electrically connected to the first input terminal 31 of the feedback voltage compensation circuit 3, the amplitude limiting circuit 4 is configured to receive an upper limit value and a lower limit value, if the first voltage signal is between the upper limit value and the lower limit value, the first voltage signal is output, if the first voltage signal is greater than the upper limit value, the first voltage signal is clamped to the upper limit value and output, if the first voltage signal is less than the lower limit value, the first voltage signal is clamped to the lower limit value and output, the feedback voltage compensation circuit 3 is configured to compensate the charging voltage according to the first voltage signal processed by the amplitude limiting circuit 4, and output the compensated charging voltage as the feedback voltage. Through setting up the amplitude limiting circuit to improve charger reliability of work, when avoiding appearing the too high or low condition of temperature, the charger is not enough to provide too high or low charging voltage, leads to the charger to break down. The upper limit input terminal 42 and the lower limit input terminal 43 of the limiter circuit 4 may be electrically connected to power supplies having different output voltages, respectively.
Optionally, referring to fig. 6, on the basis of the above embodiment, the temperature compensation circuit for charging an energy storage module according to the embodiment of the present invention further includes an upper and lower limit generating circuit 5, where the upper and lower limit generating circuit 5 includes a control terminal 51, an upper limit output terminal 52, and a lower limit output terminal 53. The upper limit output terminal 52 and the lower limit output terminal 53 of the upper and lower limit generating circuit 5 are electrically connected to the upper limit input terminal 42 and the lower limit input terminal 43 of the limiter circuit 4, respectively, and the upper and lower limit generating circuit 5 is configured to receive the charging mode control signal and switch the output upper limit value and/or lower limit value according to the charging mode control signal.
The output voltage of the charger corresponding to the constant voltage charging mode and the floating charging mode has different temperature compensation relations, and the corresponding temperature compensation ranges are different, so that the upper limit value and the lower limit value of the first voltage signal corresponding to the upper temperature limit value and the lower temperature limit value are different, and therefore the upper limit value and/or the lower limit value of the first voltage signal corresponding to different charging modes need to be switched according to the charging mode control signal. If the upper limit values of the temperatures corresponding to the different charging modes are the same, the upper limit value of the first voltage signal does not need to be switched, otherwise, the upper limit value of the first voltage signal needs to be switched; if the temperature lower limit values corresponding to different charging modes are the same, the lower limit value of the first voltage signal does not need to be switched, otherwise, the lower limit value of the first voltage signal needs to be switched.
The specific working principle is as follows: when the charging mode control signal received by the control terminal 51 of the upper and lower limit generating circuit 5 is a constant voltage charging mode control signal (for example, it may be a low level), and the charging mode is a constant voltage charging mode, the upper and lower limit generating circuit 5 controls the upper limit output terminal 52 to output an upper limit value of the constant voltage charging mode and controls the lower limit output terminal 53 to output a lower limit value of the constant voltage charging mode, the upper limit input terminal 42 of the limiter circuit 4 receives the upper limit value and the lower limit input terminal 43 of the limiter circuit 4 receives the lower limit value, the limiter circuit 4 compares the first voltage signal output by the output terminal 11 of the temperature detecting circuit 1 with the upper limit value received by the upper limit input terminal 42 and the lower limit value received by the lower limit input terminal 43, and outputs the first voltage signal after the limiting processing to the feedback voltage compensating circuit 3 through the output terminal 44 of the limiter circuit 4, and the control terminal 34 of the feedback voltage compensating circuit 3 receives the constant voltage charging mode control signal, the feedback voltage compensation circuit 3 is controlled to work in a constant voltage charging mode, the charging voltage detected by the detection terminal 32 is compensated according to the first voltage signal, and the feedback voltage is output to the feedback control circuit of the charger, so that the charging voltage temperature compensation in the constant voltage charging mode is realized; when the charging mode control signal received by the control terminal 51 of the upper and lower limit generating circuit 5 is a float charging mode control signal (for example, it may be high level), and the charging mode is a float charging mode, the upper and lower limit generating circuit 5 controls the upper limit output terminal 52 to output the upper limit value of the float charging mode, and controls the lower limit output terminal 53 to output the lower limit value of the float charging mode, the upper limit input terminal 42 of the limiter circuit 4 receives the upper limit value, the lower limit input terminal 43 of the limiter circuit 4 receives the lower limit value, the limiter circuit 4 compares the first voltage signal output by the output terminal 11 of the temperature detecting circuit 1 with the upper limit value received by the upper limit input terminal 42 and the lower limit value received by the lower limit input terminal 43, and outputs the first voltage signal after the limiter processing to the feedback voltage compensating circuit 3 through the output terminal 44 of the limiter circuit 4, the control terminal 34 of the feedback voltage compensating circuit 3 receives the float charging mode control signal, and controlling the feedback voltage compensation circuit 3 to work in a floating charge mode, compensating the charge voltage detected by the detection end 32 according to the first voltage signal, and outputting the feedback voltage to the feedback control circuit of the charger, thereby realizing the charge voltage temperature compensation in the floating charge mode.
The embodiment of the invention provides a temperature compensation circuit for charging an energy storage module. Fig. 7 is a schematic structural diagram of a temperature detection circuit according to an embodiment of the present invention. On the basis of the above embodiment, the temperature detection circuit 1 includes a temperature-variable resistor 12, a seventh resistor 13, an eighth resistor 14, a first power supply 15 and a controllable voltage regulator 16. The first end 161 of the controllable voltage regulator 16 is electrically connected with the second end 162 of the controllable voltage regulator 16 through the temperature-variable resistor 12, the first end 161 of the controllable voltage regulator 16 is electrically connected with the third end 163 of the controllable voltage regulator 16 through the seventh resistor 13, the first power supply 15 is electrically connected with the second end 162 of the controllable voltage regulator 16 through the eighth resistor 14, the third end 163 of the controllable voltage regulator 16 is grounded, and the second end 162 of the controllable voltage regulator 16 is electrically connected with the output end 11 of the temperature detection circuit 1.
Wherein, first power 15 and eighth resistance 14 electricity are connected and provide the pull-up voltage for controllable steady voltage source 16, and temperature change resistance 12 can be platinum resistance temperature sensor, can convert the temperature of energy storage module into first voltage signal, and by the return circuit that seventh resistance 13 and temperature change resistance 12 cooperation formed, can calculate the energy storage module temperature and convert first voltage signal relation into:
Figure BDA0001862250500000071
in the formula (1), V 11 Is a first voltage signal corresponding to the temperature of the energy storage module, Vs is the voltage of the reference terminal (i.e., the first terminal 161) of the controllable voltage regulator 16, R s Resistance value, R, of the temperature-dependent resistor 12 for detecting the temperature of the energy storage module 7 Is the resistance value of the seventh resistor 13, T is the temperature of the energy storage module, R0 is the resistance value of the temperature-variable resistor 12 at 0 degree centigrade, k 5 Is the temperature coefficient. Obtaining V according to equation 1 11 ＝k 2 T+V j2 K in (1) 2 And V j2 . The controllable regulated voltage source may be model number TL 431.
The embodiment of the invention provides a temperature compensation circuit for charging an energy storage module. Fig. 8 is a schematic structural diagram of another temperature compensation circuit for charging an energy storage module according to an embodiment of the present invention. On the basis of the above-described embodiment, the limiter circuit 4 includes the first operational amplifier 45, the second operational amplifier 46, the first diode 47, the second diode 48, and the voltage follower 49.
Wherein, the non-inverting input terminal of the first operational amplifier 45 is electrically connected to the upper limit input terminal 42 of the limiter circuit 4, the inverting input terminal of the first operational amplifier 45, the first input terminal 41 of the limiter circuit 4, and the anode of the first diode 47 are electrically connected to the input terminal of the voltage follower 49, the output terminal of the first operational amplifier 45 is electrically connected to the cathode of the first diode 47, the non-inverting input terminal of the second operational amplifier 46 is electrically connected to the lower limit input terminal 43 of the limiter circuit 4, the inverting input terminal of the second operational amplifier 46, the first input terminal 41 of the limiter circuit 4, and the cathode of the second diode 48 are electrically connected to the input terminal of the voltage follower 49, the output terminal of the second operational amplifier 46 is electrically connected to the anode of the second diode 48, and the output terminal of the voltage follower 49 is electrically connected to the output terminal 44 of the limiter circuit 4.
Optionally, the limiter circuit 4 further includes a twenty-second resistor 407, the first input terminal 41 of the limiter circuit 4 is electrically connected to the inverting input terminal of the first operational amplifier 45 through the twenty-second resistor 407, and the inverting input terminal of the first operational amplifier 45 and the anode of the first diode 47 are electrically connected to the input terminal of the voltage follower 49; the first input terminal 41 of the limiter circuit 4 is electrically connected to the inverting input terminal of the second operational amplifier 46 via the twenty-second resistor 407, and the inverting input terminal of the second operational amplifier 46 and the cathode of the second diode 48 are electrically connected to the input terminal of the voltage follower 49.
The specific working principle is as follows: when the first voltage signal is between the upper limit value and the lower limit value, the non-inverting input terminal of the first operational amplifier 45 will be higher than the inverting input terminal thereof, the first operational amplifier 45 is in saturation output, the output terminal of the first operational amplifier 45 will be high level, the cathode voltage of the first diode 47 will be higher than the anode voltage of the first diode 47 and be in cutoff state, the non-inverting input terminal of the second operational amplifier 46 will be higher than the non-inverting input terminal of the second operational amplifier 46, the output terminal of the second operational amplifier 46 will be low level, the anode voltage of the second diode 48 will be lower than the cathode voltage of the second diode 48 and be in cutoff state, since the input resistance of the input terminal of the voltage follower 49 is high resistance, the voltage of the non-inverting input terminal of the voltage follower 49 (i.e. the input terminal of the voltage follower 49) will be equal to the voltage value of the first voltage signal, the output terminal of the voltage follower 49 will output the first voltage signal, and the output terminal 44 of the amplitude limiting circuit 4 outputs the first voltage signal at this time; when the first voltage signal is higher than the upper limit, the voltage at the inverting input terminal of the first operational amplifier 45 will be higher than the voltage at the non-inverting input terminal of the first operational amplifier 45, the output terminal of the first operational amplifier 45 will be at low level, the cathode voltage of the first diode 47 is lower than the anode voltage, the first diode 47 will be turned on, the output terminal of the first operational amplifier 45 will form deep negative feedback to the input terminal, according to the virtual short virtual cutoff characteristic of the first operational amplifier 45, the anode voltage of the first diode 47 is equal to the upper limit, at this time, the inverting input terminal of the second operational amplifier 46 is higher than the non-inverting input terminal of the second operational amplifier 46, the output terminal of the second operational amplifier 46 will be at low level, the anode voltage of the second diode 48 will be lower than the cathode voltage and in the cutoff state, which meets the circuit stability characteristic, the anode voltage of the first diode 47 passes through the voltage follower 49, the output end of the voltage follower 49 outputs the upper limit value, and the output end 44 of the amplitude limiting circuit 4 outputs the upper limit value; when the first voltage signal is lower than the lower limit, the voltage at the non-inverting input terminal of the second operational amplifier 46 will be higher than the voltage at the inverting input terminal of the second operational amplifier 46, the output terminal of the second operational amplifier 46 will be at high level, the anode voltage of the second diode 48 will be higher than the cathode voltage, the second diode 48 will be turned on, the output terminal of the second operational amplifier 46 will form deep negative feedback to the input terminal, according to the virtual short break characteristic of the second operational amplifier 46, the cathode voltage of the second diode 48 will be equal to the lower limit, at this time, the non-inverting input terminal of the first operational amplifier 45 will be higher than the inverting input terminal of the first operational amplifier 45, the output terminal of the first operational amplifier 45 will be at high level, the cathode voltage of the first diode 47 will be higher than the anode voltage and in the cut-off state, which accords with the circuit stability characteristics, the cathode voltage of the second diode 48 passes through the voltage follower 49, the output of the voltage follower 49 will output the lower limit value, at which time the output 44 of the limiter circuit 4 outputs the lower limit value.
Optionally, the upper and lower limit generating circuit 5 includes a first voltage stabilizing power supply 54, a voltage dividing resistor network 55 and a first switch module 56, where the voltage dividing resistor network 55 includes at least three resistors, the first voltage stabilizing power supply 54 is electrically connected to the upper limit output terminal 52 of the upper and lower limit generating circuit 5, a first end of the voltage dividing resistor network 55 is electrically connected to the first voltage stabilizing power supply 54, a second end of the voltage dividing resistor network 55 is electrically connected to the lower limit output terminal 53 of the upper and lower limit generating circuit 5, a third end of the voltage dividing resistor network 55 is grounded, a control end of the first switch module 56 is electrically connected to the control end 51 of the upper and lower limit generating circuit 5, and a first end and a second end of the first switch module 56 are electrically connected to the voltage dividing resistor network 55; the first switch module 56 is configured to be turned on or off under the action of the charging mode control signal received by the control terminal thereof, so as to adjust the voltage ratio between the first terminal and the second terminal of the voltage dividing resistor network 55. Optionally, the first regulated power supply 54 is electrically connected to the upper limit output terminal 52 of the upper and lower limit generating circuit 5.
Optionally, the upper and lower limit generating circuit further includes a third regulated power supply, a third voltage-dividing resistor network, and a third switching module, where the third voltage-dividing resistor network includes at least three resistors, a first end of the third voltage-dividing resistor network 55 is electrically connected to the third regulated power supply, a second end of the third voltage-dividing resistor network is electrically connected to the upper limit output end of the upper and lower limit generating circuit, a third end of the third voltage-dividing resistor network is grounded, a control end of the third switching module is electrically connected to the control ends of the upper and lower limit generating circuit, and the first end and the second end of the third switching module are electrically connected to the third voltage-dividing resistor network; the third switch module is used for being switched on or switched off under the action of the charging mode control signal received by the control end of the third switch module so as to adjust the voltage proportion of the first end and the second end of the third voltage-dividing resistor network
Under different temperatures, the charging voltage VN required by the energy storage module in the constant-voltage charging mode and the temperature T compensation relation are in a curve compensation relation which needs to be met:
Figure BDA0001862250500000091
charging voltage V required by energy storage module in floating charging mode N The curve compensation relation to be satisfied with the temperature T compensation relation is as follows:
Figure BDA0001862250500000092
wherein, T min1 Lower limit value of temperature, T, for constant voltage charging mode max1 Upper limit value of temperature, T, for constant voltage charging mode min2 Lower limit of temperature for float charge mode, T max2 Upper limit value of temperature for float charge mode, V min1 Lower limit of charging voltage, V, for constant voltage charging mode max1 Upper limit value of charging voltage, V, for constant voltage charging mode min2 Lower limit of charging voltage, V, for float charge mode max2 The upper limit value of the charging voltage of the floating charging mode. If V max1 And V max2 Is not equal, and/or, V min1 And V min2 If the values are not equal, determining to set an upper limit and a lower limit generating circuit, and if V is not equal max1 And V max2 Equal and V min1 And V min2 If they are equal, the upper and lower limit generating circuits are not set. If the voltage upper limit values of the energy storage module in the constant voltage charging mode and the floating charging mode are the same, but the lower limit values are different, when the upper limit value and the lower limit value are generated by the upper limit value generation circuit 5, the lower limit values meeting different charging modes need to be generated according to the actual charging mode control signal.
The specific working principle is as follows: if the voltage temperature compensation curves of the energy storage module in the constant voltage charging mode and the floating charging mode have the same temperature upper limit value, and therefore the upper limit value corresponding to the first voltage signal is a fixed voltage value, the first voltage-stabilized source 54 is configured to provide a stable upper limit value, and the fixed upper limit value is output by the upper limit output terminal 52 of the upper and lower limit generating circuit. Since the charging voltage temperature compensation curves of the constant voltage charging mode and the floating charging mode have different lower temperature limits, the conduction characteristic of the first switch module 56 is controlled according to the charging mode control signal, and further, the impedance characteristic of the voltage dividing network of the voltage dividing resistor network 55 is changed to obtain different lower temperature limits. The first switching module 56 may include a MOS transistor or a transistor. Fig. 5 exemplarily shows a case where the first switching module 56 is an NMOS transistor, and fig. 8 exemplarily shows a case where the voltage dividing resistor network 55 includes a resistor 556, a resistor 557, and a resistor 558.
Referring to fig. 8, when the charging mode control signal is a constant voltage charging mode control signal (for example, may be a low level), the control terminal 563 of the first switch module 56 is at a low level, the first terminal 561 and the second terminal 562 of the first switch module 56 are turned off, and the resistor 556, the resistor 557 and the resistor 558 in the voltage dividing resistor network 55 divide the stable voltage provided by the first regulated power supply 54; when the charging mode control signal is a floating charging mode control signal (for example, it may be a high level), the control terminal 563 of the first switch module 56 is a high level, the first terminal 561 and the second terminal 562 of the first switch module 56 are turned on, the resistor 558 in the voltage dividing resistor network 55 is short-circuited, so that the voltage dividing resistor becomes small, the resistor 557 and the resistor 556 are connected in series to form a voltage dividing network, so as to divide the stable voltage provided by the first regulated power supply 54, the voltage of the second output 552 of the voltage dividing resistor network 55 becomes small, and the lower limit of the floating charging mode is output through the lower limit output terminal 53 of the upper and lower limit generating circuit. The charging mode control signal controls the on/off of the first switch module 56, and the upper and lower limit generating circuit 5 outputs the lower limit values in different charging modes to the amplitude limiting circuit 4.
Optionally, the second resistor network 37 of the feedback voltage compensation circuit 3 includes a third resistor 374, a fourth resistor 375, a fifth resistor 376 and a sixth resistor 377, wherein the first terminal 371 of the second resistor network 37 is electrically connected to the second terminal 372 of the second resistor network 37 via the third resistor 374, the first terminal 371 of the second resistor network 37 is electrically connected to the third terminal 373 of the second resistor network 37 via the fourth resistor 375, the third terminal 373 of the second resistor network 37 is electrically connected to the second terminal 372 of the second resistor network 37 via the fifth resistor 376, the third terminal 373 of the second resistor network 37 is electrically connected to the first terminal 381 of the second switch module 38 via the sixth resistor 377, and the second terminal 382 of the second switch module 38 is electrically connected to the second terminal 372 of the second resistor network 37. The number and the complexity of the resistors are increased to enlarge the value range of each resistor meeting the setting requirement, so that the resistors with specifications can be conveniently purchased and used, and a required resistor network can be flexibly built.
The specific working principle is as follows: when the charging mode control signal is a constant voltage charging mode control signal (for example, the charging mode may be a low level), that is, the charging mode is a constant voltage charging mode, the first terminal 381 and the second terminal 382 of the second switch module 38 are turned off, so that the temperature compensation performed on the detected charging voltage satisfies a compensation relationship required by the constant voltage charging mode, outputs the compensated feedback voltage to the feedback pin of the power conversion chip, and performs feedback regulation on the output voltage of the charger through a regulation algorithm inside the power conversion chip.
When the charging mode control signal is a floating charging mode control signal (for example, it may be a high level), that is, the charging mode is a floating charging mode, the first terminal 381 and the second terminal 382 of the second switch module 38 are turned on, the fifth resistor 376 is connected in parallel with the sixth resistor 377, and after the fifth resistor 376 is connected in parallel with the sixth resistor 377, the resistance becomes small, and the voltage dividing network characteristic changes, so as to compensate the detected charging voltage, satisfy the compensation relation required by the constant voltage charging mode, output the compensated feedback voltage to the feedback pin of the power conversion chip, and perform feedback adjustment on the output voltage of the charger through an adjustment algorithm inside the power conversion chip.
According to the temperature compensation circuit for charging the energy storage module, the temperature of the energy storage module is detected through the temperature detection circuit, the temperature is converted into the first voltage signal, and the detection end of the feedback voltage compensation circuit is used for detecting the charging voltage of the energy storage module; the feedback voltage compensation circuit performs temperature compensation operation on the charging voltage according to the first voltage signal to obtain and output feedback control voltage, and the feedback voltage serving as a feedback control signal can adjust the charging voltage of the energy storage module through an adjustment algorithm. The temperature compensation circuit for charging the energy storage module provided by the embodiment of the invention solves the problems that the energy storage module is insufficient in charging electric quantity in a low-temperature environment and is easy to generate overvoltage charging in a high-temperature environment, and the service life of the energy storage module is prolonged.
Optionally, fig. 9 is a schematic structural diagram of another temperature compensation circuit for charging an energy storage module according to an embodiment of the present invention. Referring to fig. 9, the temperature detecting circuit 1 further includes a first capacitor 101, wherein the second terminal 162 of the controllable voltage regulator 16 is electrically connected to the first terminal of the first capacitor 101, the second terminal of the first capacitor 101 is grounded, and the first capacitor 101 plays a role of filtering.
Optionally, with continued reference to fig. 9, the limiter circuit 4 further includes a tenth resistor 402 and an eleventh resistor 403, the first input terminal 41 of the limiter circuit 4 is electrically connected to the inverting input terminal of the first operational amplifier 45 through the tenth resistor 402, the inverting input terminal of the first operational amplifier 45, and the anode of the first diode 47 are electrically connected to the input terminal of the voltage follower 49; the first input terminal 41 of the limiter circuit 4 is electrically connected to the inverting input terminal of the second operational amplifier 46 via the eleventh resistor 403, and the inverting input terminal of the second operational amplifier 46 and the cathode of the second diode 48 are electrically connected to the input terminal of the voltage follower 49.
Optionally, with reference to fig. 9, the amplitude limiting circuit 4 further includes a ninth resistor 401, a twelfth resistor 406, a second capacitor 404, and a third capacitor 405, wherein a first end of the ninth resistor 401 is electrically connected to the non-inverting input terminal of the first operational amplifier 45, a second end of the ninth resistor 401 is electrically connected to the upper limit output terminal 52 of the upper and lower limit generating circuit 5, a first end of the twelfth resistor 406 is electrically connected to the non-inverting input terminal of the second operational amplifier 46, a second end of the twelfth resistor 406 is electrically connected to the lower limit output terminal 53 of the upper and lower limit circuit 5, a first end of the second capacitor 404 is electrically connected to the power supply terminal of the first operational amplifier 45, a second end of the second capacitor 404 is grounded, a first end of the third capacitor 405 is electrically connected to the power supply terminal of the voltage follower 49, and a second end of the third capacitor 405 is grounded. The ninth resistor 401, the tenth resistor 402, the eleventh resistor 403 and the twelfth resistor 406 respectively play a role of current limiting, and the second capacitor 404 and the third capacitor 405 respectively play a role of filtering.
Optionally, with continued reference to fig. 9, the clipping circuit 4 further comprises a third diode 407, wherein an anode of the third diode 407 is electrically connected to the output terminal of the voltage follower 49, and a cathode of the third diode 407 is electrically connected to the output terminal 44 of the clipping circuit 4. Since the first operational amplifier 45, the second operational amplifier 46 and the voltage follower 49 in the amplitude limiting circuit 4 are high impedance input and low impedance output, the third diode 407 is used to prevent the sink current existing at the output end of the voltage follower 49 from affecting the feedback control loop, so as to ensure the normal output of the charging voltage of the energy storage module.
Optionally, referring to fig. 9, the feedback voltage compensation circuit 3 further includes a thirteenth resistor 301 and a fourteenth resistor 302. A first terminal of the thirteenth resistor 301 is electrically connected to a second terminal of the fourth resistor 375, a second terminal of the thirteenth resistor 301 is electrically connected to a third terminal 373 of the second resistor network 37, a first terminal of the fourteenth resistor 302 is electrically connected to a first terminal 371 of the second resistor network 37, and a second terminal of the fourteenth resistor 302 is electrically connected to the third terminal 373 of the second resistor network 37.
Optionally, referring to fig. 9, the feedback voltage compensation circuit 3 further includes a fifteenth resistor 304, a sixteenth resistor 307 and a fourth capacitor 303, wherein a first end of the fifteenth resistor 304, a first end of the sixteenth resistor 307 and a first end of the fourth capacitor 303 are electrically connected to the control end 383 of the second switch module 38, a second end of the fifteenth resistor 304 is electrically connected to the control end 34 of the feedback voltage compensation circuit 3, and a second end of the sixteenth resistor 307 and a second end of the fourth capacitor 303 are grounded.
The thirteenth resistor 301 and the fourteenth resistor 302 are used for matching the resistance value of the second resistor network 37 in the debugging process, the fifteenth resistor 304 plays a role in limiting current, the sixteen resistor 307 plays a role in stabilizing voltage, and the fourth capacitor 303 plays a role in filtering.
Optionally, with continued reference to FIG. 9, first regulated power supply 54 includes: the first end of the seventeenth resistor 501 is electrically connected with the first power supply 15, the second end of the seventeenth resistor 501, the first end of the eighteenth resistor 502, the first end of the fifth capacitor 504 and the cathode end of the second controllable voltage-stabilizing power supply are electrically connected with the first end 541 of the first voltage-stabilizing power supply 54, the second end of the eighteenth resistor 502 and the first end of the nineteenth resistor 503 are electrically connected with the reference end of the second controllable voltage-stabilizing power supply, and the second end of the nineteenth resistor 503 and the anode end of the second controllable voltage-stabilizing power supply are both grounded. The signal of the second controllable supply may be TL 431.
Optionally, with reference to fig. 9, the upper and lower limit generating circuit further includes a twentieth resistor 507, a twenty-first resistor 509, a fifth capacitor 504, a sixth capacitor 505, a seventh capacitor 508, and a second voltage follower 506, the first input 551 of the voltage dividing resistor network 55 is grounded via the fifth capacitor 504, the second input 552 of the voltage dividing resistor network 55 is grounded via the sixth capacitor 505, the first end of the twentieth resistor 507, the first end of the twenty-first resistor 509, and the first end of the seventh capacitor 508 are electrically connected to the control end 563 of the first switch module 56, the second end of the twenty-first resistor 509 is electrically connected to the control end 51 of the upper and lower limit circuit 5, and the second end of the twentieth resistor 507 and the second end of the seventh capacitor 508 are both grounded. The input terminal of the second voltage follower 506 is electrically connected to the second terminal 552 of the voltage-dividing resistor network 55, and the output terminal of the second voltage follower 506 is electrically connected to the lower limit output terminal 53 of the upper and lower limit generating circuit 5. The seventeenth resistor 501 plays a role in current limiting protection, the eighteenth resistor 502 and the nineteenth resistor 503 play a role in voltage division, the twenty-first resistor 509 plays a role in current limiting protection, the fifth capacitor 504, the sixth capacitor 505, the twentieth resistor 507 and the seventh capacitor 508 play a role in filtering respectively, and the second voltage follower 506 plays a role in buffering and isolation.
The embodiment of the invention provides a charger. Referring to fig. 2, the charger according to the embodiment of the present invention includes a main circuit topology 7, a feedback control circuit 8, and a temperature compensation circuit 6 for charging the energy storage module according to any embodiment of the present invention, where an INPUT end 71 of the main circuit topology 7 is electrically connected to an INPUT end INPUT of the charger, an OUTPUT end 72 of the main circuit topology 7 is electrically connected to an OUTPUT end OUTPUT of the charger, an INPUT end 22 of the charging voltage detection circuit 2 is electrically connected to an OUTPUT end OUTPUT of the charger, an OUTPUT end 33 of the feedback voltage compensation circuit 3 is electrically connected to a feedback INPUT end 81 of the feedback control circuit 8, an OUTPUT end 82 of the feedback control circuit 8 is electrically connected to a control end 73 of the main circuit topology 7, and the feedback control circuit 8 is configured to obtain and OUTPUT a control signal according to a preset adjustment algorithm based on a difference between a reference voltage and a feedback voltage.
The charger provided by the embodiment of the present invention includes the temperature compensation circuit for charging the energy storage module in the above embodiment, so that the charger provided by the embodiment of the present invention also has the beneficial effects described in the above embodiment, and details are not repeated herein.
Specifically, the main topology circuit 7 is a main circuit of a switching power supply such as a flyback circuit, and fig. 10 is a schematic structural diagram of a main topology circuit provided in an embodiment of the present invention. Fig. 10 exemplarily shows a case where the main topology circuit 7 is a flyback circuit. The inputs of the main circuit topology 7 comprise a positive input 71+ and a negative input 71-to be electrically connected with the positive and negative poles of the second power source. The output of the main circuit topology 7 includes a positive output 72+ and a negative output 72-to electrically connect with the positive and negative poles of the rechargeable battery. The preset adjusting algorithm comprises one or more of proportion, integral, proportion integral and proportion integral derivative. The control signal may be a pulse signal. The feedback control circuit 8 continuously adjusts the duty ratio of the control signal through a preset adjustment algorithm, so that the main topology circuit outputs the stable charging voltage after temperature compensation. The feedback control circuit 8 OUTPUTs a control signal to the main circuit topology 7 through the OUTPUT end 82, the main circuit topology 7 adjusts the OUTPUT of the charger according to the received control signal, OUTPUTs the charging voltage after feedback adjustment through the OUTPUT end OUTPUT of the charger to charge the energy storage module, and meanwhile, the temperature compensation circuit 6 for charging the energy storage module continuously detects the charging voltage newly OUTPUT by the charger to realize the charging voltage temperature compensation closed-loop feedback adjustment.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A temperature compensation circuit for charging an energy storage module, comprising:
the temperature detection circuit is used for detecting the temperature of the energy storage module and converting the temperature into a first voltage signal;
the first input end of the feedback voltage compensation circuit is electrically connected with the output end of the temperature detection circuit, and the feedback voltage compensation circuit is used for detecting the charging voltage of the energy storage module, compensating the charging voltage according to the first voltage signal, and outputting the compensated charging voltage as the feedback voltage;
the feedback voltage compensation circuit further comprises a control end, and the feedback voltage compensation circuit is further used for receiving a charging mode control signal and switching a mode for compensating the charging voltage according to the charging mode control signal;
a limiting circuit including a first input terminal, an upper limit input terminal, a lower limit input terminal and an output terminal,
the first input end of the amplitude limiting circuit is electrically connected with the output end of the temperature detection circuit, the output end of the amplitude limiting circuit is electrically connected with the first input end of the feedback voltage compensation circuit, the amplitude limiting circuit is used for receiving an upper limit value and a lower limit value, if the first voltage signal is between the upper limit value and the lower limit value, a first voltage signal is output, if the first voltage signal is greater than the upper limit value, the first voltage signal is clamped to the upper limit value and output, and if the first voltage signal is less than the lower limit value, the first voltage signal is clamped to the lower limit value and output;
the feedback voltage compensation circuit is used for compensating the charging voltage according to the first voltage signal processed by the amplitude limiting circuit, and outputting the compensated charging voltage as a feedback voltage.
2. The temperature compensation circuit for energy storage module charging of claim 1, wherein the clipping circuit comprises a first operational amplifier, a second operational amplifier, a first diode, a second diode, and a voltage follower;
the non-inverting input end of the first operational amplifier is electrically connected with the upper limit input end of the amplitude limiting circuit, the inverting input end of the first operational amplifier, the first input end of the amplitude limiting circuit and the anode of the first diode are electrically connected with the input end of the voltage follower, and the output end of the first operational amplifier is electrically connected with the cathode of the first diode;
the non-inverting input end of the second operational amplifier is electrically connected with the lower limit input end of the amplitude limiting circuit, the inverting input end of the second operational amplifier, the first input end of the amplitude limiting circuit and the cathode of the second diode are electrically connected with the input end of the voltage follower, and the output end of the second operational amplifier is electrically connected with the anode of the second diode;
and the output end of the voltage follower is electrically connected with the output end of the amplitude limiting circuit.
3. The temperature compensation circuit for charging an energy storage module according to claim 1, further comprising an upper and lower limit generation circuit, wherein the upper and lower limit generation circuit comprises a control terminal, an upper limit output terminal, and a lower limit output terminal;
the upper limit output end and the lower limit output end of the upper and lower limit generating circuit are respectively electrically connected with the upper limit input end and the lower limit input end of the amplitude limiting circuit, and the upper and lower limit generating circuit is used for receiving a charging mode control signal and switching the output upper limit value and/or lower limit value according to the charging mode control signal.
4. The temperature compensation circuit for charging an energy storage module according to claim 3, wherein the upper and lower limit generation circuit comprises a first regulated power supply, a voltage dividing resistor network and a first switch module;
wherein the voltage-dividing resistor network comprises at least three resistors,
the first voltage-stabilized power supply is electrically connected with the upper limit output end of the upper and lower limit generating circuit,
the first end of the voltage-dividing resistance network is electrically connected with the first voltage-stabilizing power supply, the second end of the voltage-dividing resistance network is electrically connected with the lower limit output end of the upper and lower limit generating circuit, the third end of the voltage-dividing resistance network is grounded,
the control end of the first switch module is electrically connected with the control end of the upper and lower limit generating circuit, and the first end and the second end of the first switch module are electrically connected with the divider resistor network;
the first switch module is used for being switched on or switched off under the action of the charging mode control signal received by the control end of the first switch module so as to adjust the voltage proportion of the first end and the second end of the divider resistor network.
5. The temperature compensation circuit for energy storage module charging of claim 1, wherein said feedback voltage compensation circuit comprises: a first resistor, a second resistor, and a second resistor network,
wherein the second resistive network comprises at least one resistor,
a first input end of the feedback voltage compensation circuit is electrically connected with a first end of the second resistor network through the first resistor;
the detection end of the feedback voltage compensation circuit is electrically connected with the first end of the second resistor network through the second resistor;
the second end of the second resistance network is grounded, and the third end of the second resistance network is electrically connected with the output end of the feedback voltage compensation circuit.
6. The temperature compensation circuit for energy storage module charging of claim 5, wherein said feedback voltage compensation circuit further comprises: a second switching module, the second resistor network comprising at least two resistors,
the control end of the second switch module is electrically connected with the control end of the feedback voltage compensation circuit, and the first end and the second end of the second switch module are electrically connected with the second resistor network;
the second switch module is used for being switched on or switched off under the action of a charging mode control signal received by the control end of the second switch module so as to adjust the current flowing state of part of resistors in the second resistor network.
7. The temperature compensation circuit for charging an energy storage module of claim 6, wherein said second resistor network comprises a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor,
the first end of the second resistor network is electrically connected with the second end of the second resistor network through the third resistor, the first end of the second resistor network is electrically connected with the third end of the second resistor network through the fourth resistor, the third end of the second resistor network is electrically connected with the second end of the second resistor network through the fifth resistor, the third end of the second resistor network is electrically connected with the first end of the second switch module through the sixth resistor, and the second end of the second switch module is electrically connected with the second end of the second resistor network.
8. The temperature compensation circuit for charging an energy storage module of any of claims 3-4 and 6-7, wherein the charging mode control signal comprises at least one of: a constant voltage charging mode control signal and a floating charging mode control signal.
9. The temperature compensation circuit for charging an energy storage module according to claim 1, wherein the temperature detection circuit comprises a temperature-variable resistor, a seventh resistor, an eighth resistor, a first power supply and a controllable voltage-regulator source,
the first end of the controllable voltage-stabilizing source is electrically connected with the second end of the controllable voltage-stabilizing source through the temperature-variable resistor, the first end of the controllable voltage-stabilizing source is electrically connected with the third end of the controllable voltage-stabilizing source through the seventh resistor, the first power supply is electrically connected with the second end of the controllable voltage-stabilizing source through the eighth resistor, the third end of the controllable voltage-stabilizing source is grounded, and the second end of the controllable voltage-stabilizing source is electrically connected with the output end of the temperature detection circuit.
10. A charger, characterized by a main circuit topology, a feedback control circuit and a temperature compensation circuit for charging a power storage module according to any of claims 1-9,
wherein the input end of the main circuit topology is electrically connected with the input end of a charger, the output end of the main circuit topology is electrically connected with the output end of the charger,
the detection end of the feedback voltage compensation circuit is electrically connected with the output end of the charger;
the output end of the feedback voltage compensation circuit is electrically connected with the feedback input end of the feedback control circuit; the feedback voltage compensation circuit further comprises a control end, and the feedback voltage compensation circuit is further used for receiving a charging mode control signal and switching a mode for compensating the charging voltage according to the charging mode control signal;
the output end of the feedback control circuit is electrically connected with the control end of the main circuit topology;
and the feedback control circuit is used for obtaining and outputting a control signal according to the difference value between the reference voltage and the feedback voltage through a preset adjusting algorithm.
CN201811342571.8A 2018-11-12 2018-11-12 Temperature compensation circuit for charging energy storage module and charger Active CN109274153B (en)

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