CN212572131U - Charge-discharge current limit regulating circuit - Google Patents
Charge-discharge current limit regulating circuit Download PDFInfo
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- CN212572131U CN212572131U CN202021401504.1U CN202021401504U CN212572131U CN 212572131 U CN212572131 U CN 212572131U CN 202021401504 U CN202021401504 U CN 202021401504U CN 212572131 U CN212572131 U CN 212572131U
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Abstract
The utility model provides a charge-discharge current limit regulating circuit, its charge-discharge of being applied to the battery, charge-discharge current limit regulating circuit includes first reference module, second reference module, first comparator, second comparator, first amplifier, logic control module, switch drive circuit module and first transistor, wherein, first reference module is including the first resistance that is used for adjusting output current or voltage, the second reference module is including the second resistance that is used for adjusting output current or voltage. Compared with the prior art, the utility model discloses a charge-discharge current limit regulating circuit realizes that independent control charges and/or discharge current limit adjusts to application scheme is simple and the range of application is wide.
Description
Technical Field
The utility model relates to a battery charge-discharge technical field especially relates to a be applied to charge-discharge current limit regulating circuit of battery.
Background
At present, mobile devices such as smart phones, wearable devices, electric tools, unmanned aerial vehicles and the like are used more and more. Lithium ion battery powered applications in the mobile device are an important part thereof. Because lithium ion batteries have stability problems, battery protection circuits are widely used in battery power supply systems. The battery protection circuit can realize various protection functions, such as battery overvoltage, battery voltage overdischarge, charging current limit, discharging current limit and the like.
The charge and discharge current limits of the battery protection circuit of the related art are set to the same value, or the charge current and the discharge current are fixed by an internal circuit. As shown in fig. 1, fig. 1 is a circuit diagram of an application of a battery protection circuit in the related art, and the battery protection circuit performs battery protection by using a fixed current limit. U0 is a battery protection circuit with fixed current limit. Wherein TM is a charging power supply, RLOAD is a load resistor, a resistor R1 and a capacitor C1 form an RC circuit between a power supply voltage and a ground GND, and B is a lithium battery. The circuit connection of the circuit diagram shows that the battery protection circuit adopts a fixed current limit mode to protect the battery and cannot adjust the charging and discharging current limits.
Meanwhile, in order to meet IEC62368 certification, a battery application scheme employing a fixed current limit protection circuit requires three devices, which are a charging device, an overvoltage/overcurrent protection device, and a battery protection device, respectively. As shown in fig. 2, fig. 2 is a block diagram of the circuit structure of fig. 1. Specifically, the circuit structure of the battery protection circuit is shown in fig. 2, where U1 is a battery protection device, U2 is a charging device, and U3 is an overvoltage/overcurrent protection device. In this application, accurate over-current protection of the battery can be achieved even if one of the components U2 and U3 fails.
However, in the related art, the charging and discharging current limits cannot be respectively adjusted by adopting the fixed current limit protection circuit so as to adapt to charging and discharging of lithium batteries of different models.
Therefore, it is necessary to provide a new circuit to solve the above problems.
SUMMERY OF THE UTILITY MODEL
To the not enough of above prior art, the utility model provides a realize independent control charging and/or discharge current limit and adjust to the simple and wide charge-discharge current limit regulating circuit of range of application scheme.
In order to solve the above technical problem, the utility model provides a charge-discharge current limit regulating circuit, it is applied to the charge-discharge of battery, charge-discharge current limit regulating circuit includes first reference module, second reference module, first comparator, second comparator, first amplifier, logic control module, switch drive circuit module and first transistor;
wherein the first reference module comprises a first resistance for regulating an output current or voltage, and the second reference module comprises a second resistance for regulating an output current or voltage;
the output end of the first reference module is connected to the positive input end of the first comparator;
the output end of the second reference module is connected to the negative input end of the second comparator;
the output end of the first amplifier is respectively connected to the negative input end of the first comparator and the positive input end of the second comparator;
the output end of the first comparator is connected to the first input end of the logic control module;
the output end of the second comparator is connected to the second input end of the logic control module;
the output end of the logic control module is connected to the input end of the switch driving circuit module;
a first output end of the switch driving circuit module is connected to the grid electrode of the first transistor, and a second output end of the switch driving circuit module is connected to the substrate of the first transistor;
the drain electrode of the first transistor is connected to the negative input end of the first amplifier and is used as a charging and discharging interface end of the charging and discharging current limit adjusting circuit;
the source of the first transistor and the positive input of the first amplifier are both connected to ground.
Preferably, the first transistor is a power switch tube.
Preferably, the first transistor is an NMOS transistor.
Preferably, the logic control module is a digital circuit, and the first reference module, the second reference module, the first comparator, the second comparator, the first amplifier, and the switch driving circuit module are all analog circuits.
Preferably, the first reference module further includes a first current source, an input terminal of the first current source is connected to a power supply voltage, an output terminal of the first current source is connected to a first terminal of the first resistor and serves as an output terminal of the first reference module, and a second terminal of the first resistor is connected to ground; the second reference module further comprises a second current source, an input end of the second current source is connected to a power supply voltage, an output end of the second current source is connected to a first end of the second resistor and serves as an output end of the second reference module, and a second end of the second resistor is connected to the ground.
Preferably, the first reference module further includes a first current mirror circuit unit, a second transistor, and a second amplifier; a first output end of the first current mirror circuit unit is connected to a drain electrode of the second transistor, and a second output end of the first current mirror circuit unit is used as an output end of the first reference module; the source of the second transistor is connected to the positive input end of the second amplifier and the first end of the first resistor respectively, and the gate of the second transistor is connected to the output end of the second amplifier; the second end of the first resistor is connected to the ground; the negative input end of the second amplifier is used as a first reference voltage input end; the second reference module further includes a second current mirror circuit unit, a third transistor, and a third amplifier; a first output end of the second current mirror circuit unit is connected to a drain electrode of the third transistor, and a second output end of the second current mirror circuit unit is used as an output end of the second reference module; a source of the third transistor is connected to a positive input end of the third amplifier and a first end of the second resistor, respectively, and a gate of the third transistor is connected to an output end of the third amplifier; the second end of the second resistor is connected to the ground; and the negative input end of the third amplifier is used as a second reference voltage input end.
Compared with the prior art, charge-discharge current limit regulating circuit includes first reference module, second reference module, first comparator, second comparator, first amplifier, logic control module, switch drive circuit module and first transistor. The charging and discharging current limit adjusting circuit is characterized in that the first resistor used for adjusting the output current or voltage is arranged on the first reference module, and the second resistor used for adjusting the output current or voltage is arranged on the second reference module. Therefore, the circuit realizes independent control of charging and/or discharging current limit regulation, and meets application requirements of different types of batteries and different systems, so that the charging and discharging current limit regulation circuit is wide in application range. And simultaneously can pass through when carrying out IEC62368 authentication the utility model provides a charge-discharge current limit regulating circuit replaces excessive pressure/overcurrent protection circuit to simplify the battery application scheme, thereby make charge-discharge current limit regulating circuit application scheme is simple and the range of application is wide.
Drawings
The present invention will be described in detail with reference to the accompanying drawings. The foregoing and other aspects of the invention will become more apparent and more readily appreciated from the following detailed description, taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 is an applied circuit diagram of a battery protection circuit of the related art;
FIG. 2 is a block diagram of the circuit of FIG. 1;
FIG. 3 is a circuit diagram of the charging/discharging current limit adjusting circuit of the present invention;
fig. 4 is a block diagram of an application circuit of the charging/discharging current limit adjusting circuit of the present invention;
fig. 5 is a circuit structure diagram of a first embodiment of the charging and discharging current limit adjusting circuit of the present invention;
fig. 6 is a circuit structure diagram of a second embodiment of the charging and discharging current limit adjusting circuit of the present invention;
fig. 7 is an applied circuit diagram of the charging and discharging current limit adjusting circuit of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.
The embodiments/examples set forth herein are specific embodiments of the present invention and are presented for illustrative purposes only, and are not intended to be construed as limitations on the scope of the invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include those which make any obvious replacement or modification of the embodiments described herein, and all of which are within the scope of the present invention.
Referring to fig. 3, the present invention provides a charging/discharging current limit adjusting circuit 100. The method is applied to charging and discharging of the battery B. The charging and discharging current limit adjusting circuit 100 includes a first reference module S1, a second reference module S2, a first comparator COMP1, a second comparator COMP2, a first amplifier AMP1, a logic control module LOG, a switch driving circuit module DVR, and a first transistor M1.
Wherein the first reference module S1 includes a first resistor R3 for regulating an output current or voltage, and the second reference module S2 includes a second resistor R2 for regulating an output current or voltage.
The specific circuit structure of the charging and discharging current limit adjusting circuit 100 is as follows:
an output terminal of the first reference module S1 is connected to a positive input terminal of the first comparator COMP 1.
An output terminal of the second reference module S2 is connected to a negative input terminal of the second comparator COMP 2.
An output terminal of the first amplifier AMP1 is connected to a negative input terminal of the first comparator COMP1 and a positive input terminal of the second comparator COMP2, respectively.
An output terminal of the first comparator COMP1 is connected to a first input terminal of the logic control module LOG.
An output terminal of the second comparator COMP2 is connected to a second input terminal of the logic control module LOG.
And the output end of the logic control module LOG is connected to the input end of the switch driving circuit module DVR.
A first output terminal of the switch driving circuit module DVR is connected to the gate of the first transistor M1, and a second output terminal of the switch driving circuit module DVR is connected to the substrate of the first transistor M1.
The drain of the first transistor M1 is connected to the negative input terminal of the first amplifier AMP1 and serves as the charge/discharge interface terminal VM of the charge/discharge current limit adjusting circuit 100.
The source of the first transistor M1 and the positive input of the first amplifier AMP1 are both connected to ground GND.
The drain of the first transistor M1 is used as a charge/discharge interface terminal VM. The charge and discharge interface end VM is used for outputting a charge or discharge current. The first transistor M1 is a power switch tube. Of course, without limitation, the first transistor M1 may also be an NMOS transistor.
Specifically, the logic control module LOG is a digital circuit. The first reference module S1, the second reference module S2, the first comparator COMP1, the second comparator COMP2, the first amplifier AMP1 and the switch driving circuit module DVR are all analog circuits. It should be noted that the logic control module LOG, the first comparator COMP1, the second comparator COMP2, the first amplifier AMP1, the switch driving circuit module DVR, the first resistor R3, the second resistor R2, and the first transistor M1 are all devices or circuit modules commonly used in the art, and specific models need to be selected according to actual designs, which are not described in detail herein.
Referring to fig. 4, fig. 4 is a block diagram of an application circuit of the charging/discharging current limit adjusting circuit 100 according to the present invention. Compare with prior art's battery protection circuit, the utility model discloses charge-discharge current limit regulating circuit 100's technical scheme can realize that battery protection circuit's the current limit that charges, discharges carries out independent setting. When battery protection circuit has the independent adjustment of charging, discharge current limit, at its application circuit of application circuit block diagram relative to correlation technique's battery protection circuit, the utility model discloses a charge-discharge current limit regulating circuit 100 reduces this components and parts of excessive pressure/overcurrent protection device U3.
The utility model discloses an among the charge-discharge current limit regulating circuit 100, U1 is the battery protection device, and U2 is the charging device. Two components and parts just can realize the duplicate overcurrent protection to the battery like this, even there is a component inefficacy in U1 or U2, this application scheme is safe and reliable still to make can pass through when carrying out IEC62368 authentication charge-discharge current limit regulating circuit 100 replaces excessive pressure/overcurrent protection circuit, thereby simplifies the battery application scheme, thereby makes charge-discharge current limit regulating circuit application scheme is simple and the range of application is wide.
Different working circuits are adopted according to the first resistor R3 and the second resistor R2 to adjust the current limit of output charging or discharging, and the following detailed description is provided by two embodiments. The circuits of the two embodiments are substantially the same, and the difference between the two embodiments is the specific circuits of the first reference block S1 and the second reference block S2.
Example one
Referring to fig. 5, a charging/discharging current limit adjusting circuit 200 is provided in the first embodiment.
The charging and discharging current limit adjusting circuit 200 includes a first reference block 2S1 and a second reference block 2S 2. The first reference block 2S1 and the second reference block 2S2 are both used to generate reference voltages. The first reference module 2S1 includes the first resistor R3. The second reference module 2S2 includes the second resistor R2.
Specifically, the first reference block 2S1 further includes a first current source IREF 1. The input end of the first current source IREF1 is connected to the power supply voltage VDD.
The circuit connection relationship of the first reference module 2S1 is: an output terminal of the first current source IREF1 is connected to a first terminal of the first resistor R3 and serves as an output terminal DSG of the first reference block 2S 1. The second end of the first resistor R3 is connected to ground GND.
The circuit formed by the first current source IREF1 and the first resistor R3 is used for generating a discharge current limit reference voltage VDSG. The discharge current limit reference voltage VDSG is a voltage of the output terminal DSG of the first reference module 2S1, and the discharge current limit reference voltage VDSG is used for setting a discharge current limit.
The second reference block 2S2 also includes a second current source IREF 2.
The circuit connection relationship of the second reference module 2S2 is: the input end of the second current source IREF2 is connected to the power supply voltage VDD. An output terminal of the second current source IREF2 is connected to a first terminal of the second resistor R2 and serves as an output terminal CHG of the second reference module 2S 2. The second end of the second resistor R2 is connected to ground GND.
The circuit formed by the second current source IREF2 and the second resistor R2 is used for charging the current limit reference voltage VCHG. The charging current limit reference voltage VCHG is the voltage of the output CHG of the second reference module S2. The charging current limit reference voltage VCHG is used to set the charging current limit.
The first comparator COMP1 is a comparator for adjusting a discharge current limit, the first comparator COMP1 is configured to compare a discharge current limit reference with a charge-discharge current sampling signal ICS, and an output signal of the first comparator COMP1 is an ODSG signal. When the ODSG signal is at a high level, it indicates that the discharge current of the charge/discharge interface terminal VM at which the first transistor M1 is connected is greater than the set discharge current limit.
Similarly, the second comparator COMP2 is a comparator for adjusting the charging current limit, the second comparator COMP2 is used for setting the charging current limit, and the output signal of the second comparator COMP2 is an OCHG signal. When the ODSG signal is at a high level, it indicates that the charging current of the charging/discharging interface VM at which the first transistor M1 is connected is greater than the set charging current limit.
The logic control module LOG is a digital circuit, and of course, the logic control module LOG may also be a digital-analog hybrid circuit. The logic control module LOG is used for controlling the first transistor M1 to be turned on and off.
The first transistor M1 is a power switch. The first transistor M1 is used to realize charge and discharge control in battery applications.
The switch driving circuit module DVR is a gate driving circuit of the first transistor M1.
The first amplifier AMP1 samples and amplifies the current of the first transistor M1, and the first transistor M1 outputs a charge-discharge current sampling signal ICS to the first comparator COMP1 and the second comparator COMP 2.
The circuit operating principle of the charging and discharging current limit adjusting circuit 200 is as follows:
when the reference current IREF1 of the first current source IREF1 and the reference current IREF2 of the second current source IREF2 respectively flow through the first resistor R3 and the second resistor R2, discharge current limit reference voltage signals VDSG and VCHG are generated (wherein V is satisfied)DSG＝IREF1·R3，VCHG＝IREF2·R2). When the first transistor M1 is turned on, the first amplifier AMP1 samples a current when the first transistor M1 is turned on, and outputs a VICS signal, where V isICS＝IM1K, K is the amplification of the first amplifier AMP 1. In the battery application circuit, when the battery is in a discharge state, a VICS signal is input to the first comparator COMP1 and is compared with a VDSG signal, when VICS > VDSG, the first comparator COMP1 outputs a signal ODSG at a high level, the first transistor M1 is controlled to be turned off by the logic control module LOG and the switch driving circuit module DVR, the on-state current between the charging/discharging interface VM and the ground GND is cut off, the battery discharge current protection is realized, and at this time, the power switch discharge protection current is determined to be:
according to this formula, the battery discharge current limit can be adjusted by the first resistor R3 of the charge/discharge current limit adjusting circuit 200.
Similarly, when the battery is in a charging mode, a VICS signal is input to the second comparator COMP2 and is compared with a VCHG signal, when VICS is greater than VCHG, a signal OCHG output by the second comparator COMP2 is at a high level, the first transistor M1 is controlled to be turned off by the logic control module LOG and the switch driving circuit module DVR, and the on-state current between the charging/discharging interface VM and the ground GND is cut off to realize battery charging current protection, and at this time, it is determined that the charging protection current for cutting off the charging/discharging interface VM is:
the battery charging current limit can be adjusted by the second resistor R2 of the charging and discharging current limit adjusting circuit 200.
Example two
Referring to fig. 6, the second embodiment provides a charging/discharging current limit adjusting circuit 300.
The charging and discharging current limit adjusting circuit 300 includes a first reference block 3S1 and a second reference block 2S 2. The first reference block 3S1 and the second reference block 3S2 are both used to generate a reference current. The first reference module 3S1 includes the first resistor R3, and the second reference module 3S2 includes the second resistor R2. Wherein, the reference current can be directly generated by the first resistor R3 and the second resistor R2.
Wherein the specific circuit structures of the first reference block 3S1 and the second reference block 3S2 are:
the first reference block 3S1 further includes a first current mirror circuit unit CM1, a second transistor M2, and a second amplifier AMP 2.
The first reference module 3S1 is used for generating a discharge current limit reference current IDSG. The discharging current limit reference current IDSG is a current of the output terminal DSG of the first reference module S1.
The circuit connection relationship of the first reference module 3S1 is: a first output terminal of the first current mirror circuit unit CM1 is connected to the drain of the second transistor M2. A second output terminal of the first current mirror circuit unit CM1 serves as the output terminal DSG of the first reference block 3S 1. A source of the second transistor M2 is connected to a positive input terminal of the second amplifier AMP2 and a first terminal of the first resistor R3, respectively. The gate of the second transistor M2 is connected to the output terminal of the second amplifier AMP 2. The second end of the first resistor R3 is connected to ground GND. The negative input of the second amplifier AMP2 serves as the first reference voltage input VREF 1.
The second reference block 3S2 further includes a second current mirror circuit unit CM2, a third transistor M3, and a third amplifier AMP 3.
The second reference module 3S2 is configured to generate a charging current limit reference current ICHG. A charging current limit reference current ICHG being the current at the output CHG of the second reference module 3S2
The circuit connection relationship of the second reference module 3S2 is: a first output terminal of the second current mirror circuit unit CM2 is connected to the drain of the third transistor M3. A second output terminal of the second current mirror circuit unit CM2 serves as the output terminal CHG of the second reference block 3S 2. A source of the third transistor M3 is connected to a positive input terminal of the third amplifier AMP3 and a first terminal of the second resistor R2, respectively. A gate of the third transistor M3 is connected to an output terminal of the third amplifier AMP 3. The second end of the second resistor R2 is connected to ground GND. The negative input terminal of the third amplifier AMP3 serves as a second reference voltage input terminal VREF 2.
The first comparator COMP1 is a comparator for adjusting a discharge current limit, the first comparator COMP1 is configured to compare a discharge current limit reference with a charge-discharge current sampling signal ICS, and an output signal of the first comparator COMP1 is an ODSG signal. When the ODSG signal is at a high level, it indicates that the discharge current of the charge/discharge interface terminal VM at which the first transistor M1 is connected is greater than the set discharge current limit.
Similarly, the second comparator COMP2 is a comparator for adjusting the charging current limit, the second comparator COMP2 is used for setting the charging current limit, and the output signal of the second comparator COMP2 is an OCHG signal. When the ODSG signal is at a high level, it indicates that the charging current of the charging/discharging interface VM at which the first transistor M1 is connected is greater than the set charging current limit.
The logic control module LOG is a digital circuit, and of course, the logic control module LOG may also be a digital-analog hybrid circuit. The logic control module LOG is used for controlling the first transistor M1 to be turned on and off.
The first transistor M1 is a power switch. The first transistor M1 is used to realize charge and discharge control in battery applications.
The switch driving circuit module DVR is a gate driving circuit of the first transistor M1.
The first amplifier AMP1 samples and amplifies the current of the first transistor M1, and the first transistor M1 outputs a charge-discharge current sampling signal ICS to the first comparator COMP1 and the second comparator COMP 2.
The circuit operating principle of the charging and discharging current limit adjusting circuit 300 is as follows:
generating discharging current limit reference current signals IDSG and ICHG when the reference voltage of the first reference voltage input terminal VREF1 and the reference voltage of the second reference voltage input terminal VREF2 respectively flow through the first resistor R3 and the second resistor R2
When the first transistor M1 is turned on, the first amplifier AMP1 samples a current when the first transistor M1 is turned on and outputs IICS, IICS＝IM1K, K is the amplification of the first amplifier AMP 1. In the battery application circuit, when the battery is in a discharge state, IICS is input to COMP1 and compared with IDSG, when IICS > IDSG,then, the output of the signal ODSG output by the first comparator COMP1 is a high level, the first transistor M1 is controlled to be turned off by the logic control module LOG and the switch driving circuit module DVR, and the on-current between the charge/discharge interface VM and the ground GND is cut off, so as to realize the battery discharge current protection, and at this time, it is determined that the power switch discharge protection current is:
according to this formula, the battery discharge current limit can be adjusted by the first resistor R3 in the charge/discharge current limit adjusting circuit 300.
Similarly, when the battery is in the charging mode, IICS is input to the second comparator COMP2, and is compared with ICHG, and when IICS is greater than ICHG, the output signal OCHG of the second comparator COMP2 is at a high level, the first transistor M1 is controlled to be turned off by the logic control module LOG and the switch driving circuit module DVR, so as to disconnect the conduction current between the charging/discharging interface VM and the ground GND, thereby realizing the battery charging current protection, and at this time, it is determined that the charging protection current for disconnecting the charging/discharging interface VM is:
the battery charging current limit can be adjusted by the second resistor R2 in the charging and discharging current limit adjusting circuit 300.
As can be seen from the first and second embodiments, the charging and discharging current limit adjusting circuit 100 is configured by providing the first resistor R3 for adjusting the output current or voltage at the first reference module S1, and simultaneously providing the second resistor R2 for adjusting the output current or voltage at the second reference module S2. Therefore, the circuit realizes independent control of charging and/or discharging current limit regulation, and meets application requirements of different types of batteries and different systems, so that the charging and discharging current limit regulation circuit is wide in application range.
In order to facilitate the use of the charging and discharging current limit adjusting circuit 100, the charging and discharging current limit is easily adjusted. In application, the first resistor R3 and the second resistor R2 may be disposed in an application circuit, and the circuit modules and components of the charging and discharging current limit adjusting circuit 100 except the first resistor R3 and the second resistor R2 may be integrated and packaged into a whole, for example, manufactured as a single chip U4. Referring to fig. 7, fig. 7 is a circuit diagram of an application of the charging/discharging current limit adjusting circuit of the present invention. In an application circuit diagram, a chip U4, the first resistor R3 and the second resistor R2 jointly form the charging and discharging current limit adjusting circuit 100. This be provided with do benefit to through first resistance R3 with charge-discharge current limit is adjusted to second resistance R2, thereby makes charge-discharge current limit adjustment circuit 100 application scheme is simple and the range of application is wide.
Compared with the prior art, charge-discharge current limit regulating circuit includes first reference module, second reference module, first comparator, second comparator, first amplifier, logic control module, switch drive circuit module and first transistor. The charging and discharging current limit adjusting circuit is characterized in that the first resistor used for adjusting the output current or voltage is arranged on the first reference module, and the second resistor used for adjusting the output current or voltage is arranged on the second reference module. Therefore, the circuit realizes independent control of charging and/or discharging current limit regulation, and meets application requirements of different types of batteries and different systems, so that the charging and discharging current limit regulation circuit is wide in application range. And simultaneously can pass through when carrying out IEC62368 authentication the utility model provides a charge-discharge current limit regulating circuit replaces excessive pressure/overcurrent protection circuit to simplify the battery application scheme, thereby make charge-discharge current limit regulating circuit application scheme is simple and the range of application is wide.
It should be noted that the above-mentioned embodiments described with reference to the drawings are only intended to illustrate the present invention and not to limit the scope of the present invention, and those skilled in the art should understand that modifications or equivalent substitutions made on the present invention without departing from the spirit and scope of the present invention should be included in the scope of the present invention. Furthermore, unless the context indicates otherwise, words that appear in the singular include the plural and vice versa. Additionally, all or a portion of any embodiment may be utilized with all or a portion of any other embodiment, unless stated otherwise.
Claims (6)
1. A charge-discharge current limit regulating circuit is applied to charge and discharge of a battery and is characterized by comprising a first reference module, a second reference module, a first comparator, a second comparator, a first amplifier, a logic control module, a switch driving circuit module and a first transistor; wherein the first reference module comprises a first resistance for regulating an output current or voltage, and the second reference module comprises a second resistance for regulating an output current or voltage;
the output end of the first reference module is connected to the positive input end of the first comparator;
the output end of the second reference module is connected to the negative input end of the second comparator;
the output end of the first amplifier is respectively connected to the negative input end of the first comparator and the positive input end of the second comparator;
the output end of the first comparator is connected to the first input end of the logic control module;
the output end of the second comparator is connected to the second input end of the logic control module;
the output end of the logic control module is connected to the input end of the switch driving circuit module;
a first output end of the switch driving circuit module is connected to the grid electrode of the first transistor, and a second output end of the switch driving circuit module is connected to the substrate of the first transistor;
the drain electrode of the first transistor is connected to the negative input end of the first amplifier and is used as a charging and discharging interface end of the charging and discharging current limit adjusting circuit;
the source of the first transistor and the positive input of the first amplifier are both connected to ground.
2. The charging and discharging current limit regulating circuit according to claim 1, wherein the first transistor is a power switch tube.
3. The charging and discharging current limit adjusting circuit according to claim 1, wherein the first transistor is an NMOS transistor.
4. The charging and discharging current limit adjusting circuit according to claim 1, wherein the logic control module is a digital circuit, and the first reference module, the second reference module, the first comparator, the second comparator, the first amplifier and the switch driving circuit module are analog circuits.
5. The charge-discharge current limit adjustment circuit according to any one of claims 1 to 4,
the first reference module further comprises a first current source, an input end of the first current source is connected to a power supply voltage, an output end of the first current source is connected to a first end of the first resistor and serves as an output end of the first reference module, and a second end of the first resistor is connected to the ground;
the second reference module further comprises a second current source, an input end of the second current source is connected to a power supply voltage, an output end of the second current source is connected to a first end of the second resistor and serves as an output end of the second reference module, and a second end of the second resistor is connected to the ground.
6. The charge-discharge current limit adjustment circuit according to any one of claims 1 to 4,
the first reference module further comprises a first current mirror circuit unit, a second transistor and a second amplifier;
a first output end of the first current mirror circuit unit is connected to a drain electrode of the second transistor, and a second output end of the first current mirror circuit unit is used as an output end of the first reference module;
the source of the second transistor is connected to the positive input end of the second amplifier and the first end of the first resistor respectively, and the gate of the second transistor is connected to the output end of the second amplifier;
the second end of the first resistor is connected to the ground;
the negative input end of the second amplifier is used as a first reference voltage input end;
the second reference module further includes a second current mirror circuit unit, a third transistor, and a third amplifier;
a first output end of the second current mirror circuit unit is connected to a drain electrode of the third transistor, and a second output end of the second current mirror circuit unit is used as an output end of the second reference module;
a source of the third transistor is connected to a positive input end of the third amplifier and a first end of the second resistor, respectively, and a gate of the third transistor is connected to an output end of the third amplifier;
the second end of the second resistor is connected to the ground;
and the negative input end of the third amplifier is used as a second reference voltage input end.
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| CN202021401504.1U CN212572131U (en) | 2020-07-16 | 2020-07-16 | Charge-discharge current limit regulating circuit |
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| CN (1) | CN212572131U (en) |
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2020
- 2020-07-16 CN CN202021401504.1U patent/CN212572131U/en active Active
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