CN115622183A - Control circuit for preventing hot plug during charging of high-voltage lithium battery - Google Patents
Control circuit for preventing hot plug during charging of high-voltage lithium battery Download PDFInfo
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- CN115622183A CN115622183A CN202211300157.7A CN202211300157A CN115622183A CN 115622183 A CN115622183 A CN 115622183A CN 202211300157 A CN202211300157 A CN 202211300157A CN 115622183 A CN115622183 A CN 115622183A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00308—Overvoltage protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
A high-voltage lithium battery charging hot plug prevention control circuit comprises a charge pump module, a clamping module and a clamping module, wherein the charge pump module is used for converting a power supply voltage VDD into a high-voltage power supply V1, the clamping module is used for limiting the high-voltage power supply V1 to a fixed voltage, the clamping module comprises a first clamping unit and a second clamping unit which are sequentially connected between the high-voltage power supply V1 and a grounding end in series, a control switch MLC1, a high-voltage tube MHV1, an LDO module which is used for converting a power supply V2 voltage into a control battery normal charging voltage VBAT, and a battery full charge detection circuit which is used for detecting a battery in a charging state, when the battery is in the charging state, the high-voltage transistor MHV1 is conducted, and V2= VIN; when the battery is in a full-charge state, the battery full-charge detection circuit outputs a high level signal to the control switch MLC1, the control switch MLC1 is turned on, and the control switch MLC1 is in short circuit with the second clamping unit to reduce the voltage of the high-voltage power supply V1 so as to protect the LDO module.
Description
Technical Field
The invention belongs to the technical field of integrated circuit design, and relates to a control circuit for preventing hot plug during high-voltage lithium battery charging.
Background
In order to avoid the chip from being damaged by hot plug operation when the lithium battery is nearly full of the chip, the high-voltage lithium battery charging needs to be protected when hot plug operation is carried out, namely, the control circuit for preventing hot plug of the high-voltage lithium battery charging is more and more widely applied.
Referring to fig. 1, fig. 1 is a schematic diagram illustrating a control circuit for preventing hot plug during charging of a high voltage lithium battery in the prior art. As shown in fig. 1, the circuit may generally include a charge pump circuit, a clamp circuit, a high voltage pipe MHV1, an LDO module, and the like.
The charge pump circuit can comprise an oscillator module, a capacitor C1, a capacitor C2, a charge pump switch tube M1, a charge pump switch tube M2, a charge pump switch tube M3 and a charge pump switch tube M4; the oscillator module generates a CLK signal and a CLKN signal, wherein the CLKN signal is an inverted signal of the CLK signal; when the CLK signal is high, the CLKN signal is low; the charge pump switch tube M1 is switched on, and the charge pump switch tube M2 is switched off; the charge pump switch tube M3 is turned off, the charge pump switch tube M4 is turned on, and 2 × vdd voltage is transmitted to V1 through the charge pump switch tube M4; when the CLK signal is low, the CLKN signal is high; the charge pump switch tube M2 is switched on, and the charge pump switch tube M1 is switched off; the charge pump switch tube M4 is turned off, the charge pump switch tube M3 is turned on, and 2 × vdd voltage is transmitted to V1 through the charge pump switch tube M3; thus, V1 can maintain 2 times the VDD voltage.
A clamping circuit: since the voltage of V1=2 × vdd may exceed the voltage withstanding value of the drain G of the high-voltage device MHV1, a clamping circuit is required, which may be generated by connecting several zener diodes in series as shown in fig. 1; or connecting the Gate and source Drain terminals of the transistor as shown in fig. 2, connecting several in series; or a Zener diode and the grid electrode Gate and the source electrode Drain end of the common MOS transistor are connected in series.
High-voltage transistor MHV1: when VIN is low voltage, the high-voltage transistor is turned on, and V2= VIN; when VIN is higher voltage, the device is used as a voltage blocking pipe to protect the lower low-voltage circuit.
An LDO module: converting the V2 voltage into a normal charging voltage VBAT to control the battery to be charged normally; the LDO module is a circuit composed of low-voltage devices.
The above prior art has the following disadvantages:
in normal application, VIN is supplied by a relatively low voltage VA; in order to ensure that the high-voltage tube does not generate a large amount of power consumption in the power supply process, the voltage of the G end (drain electrode) of the MHV1 of the general high-voltage transistor is higher than the voltage VIN, so that the MHV1 works in a deep linear region and is ensured to be fully conducted; however, when the charging is nearly complete, the VIN terminal power supply will have a hot swap action, which causes the VIN voltage to generate a spike of a higher voltage instantaneously.
Since the high voltage transistor MHV1 operates in a deep linear region, the voltage V2 will also generate a spike (as shown in fig. 3); the maximum voltage of the LDO module can reach the voltage value of V1-VGS, and the pulse voltage of the maximum voltage reaching V1-VGS still causes damage to the low-voltage devices of the internal LDO module because the LDO module is a circuit composed of low-voltage devices.
Disclosure of Invention
In order to solve the technical problem, the invention provides a control circuit for preventing hot plug of high-voltage lithium battery charging, which can solve the problem that a chip is abnormally damaged when hot plug action is carried out when the high-voltage lithium battery charging is nearly full.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a control circuit for preventing hot plug in high voltage lithium battery charging comprises:
the charge pump module is used for converting a power supply voltage VDD into a high-voltage power supply V1;
the clamping module comprises a first clamping unit and a second clamping unit which are sequentially connected between the high-voltage power supply V1 and a ground terminal in series and used for limiting the high-voltage power supply V1 to a fixed voltage;
a control switch MLC1, wherein the source electrode of the control switch MLC1 is connected with the connection point of the first clamping unit and the second clamping unit, and the drain electrode of the control switch MLC1 is grounded;
a source electrode of the high-voltage tube MHV1 is connected with a power supply VIN, a drain electrode of the high-voltage tube MHV1 is connected with a power supply V2, and a grid electrode of the high-voltage tube MHV1 is connected with the high-voltage power supply V1;
the LDO module is used for converting the voltage of the power supply V2 into a charging voltage VBAT and controlling the battery to be charged normally;
a battery full charge detection circuit for detecting a state of charge of the battery; wherein the content of the first and second substances,
when the battery is in a charging state, the high-voltage transistor MHV1 is conducted, and V2= VIN; when the battery is in a full-charge state, the battery full-charge detection circuit outputs a high level signal to the control switch MLC1, the control switch MLC1 is turned on, and the control switch MLC1 is in short circuit with the second clamping unit to reduce the voltage of the high-voltage power supply V1 so as to protect the LDO module.
Further, the battery full charge detection module includes a low-voltage transistor MLV2, which is a mirror image of the low-voltage transistor MLV1, a first comparator, and a resistor R3, and is configured to mirror a current of the low-voltage transistor MLV1, that is, a current passing through the low-voltage transistor MLV2 is IMV2= k × IMV1; the low-voltage transistor MLV2 is connected to the gate of the low-voltage transistor MLV1, the source of the low-voltage transistor MLV2 is connected to the power supply V2, the resistor R3 is connected between the drain of the low-voltage transistor MLV2 and the positive input end and the ground end of the comparator, and the negative input end of the comparator is connected to the reference voltage VREF1;
when the IMV2 × R3< VREF1, the battery reaches the first voltage threshold, the comparator outputs a high level signal to the control switch MLC1, the control switch MLC1 is turned on, and the control switch MLC1 short-circuits the second clamping unit to reduce the voltage of the high-voltage power supply V1.
Further, the charge pump module comprises an oscillator module, a capacitor C1, a capacitor C2, a charge pump switch tube M1, a charge pump switch tube M2, a charge pump switch tube M3, and a charge pump switch tube M4; the oscillator module generates a CLK signal and a CLKN signal, wherein the CLKN signal is an inverted signal of the CLK signal; when the CLK signal is high, the CLKN signal is low; the charge pump switch tube M1 is switched on, and the charge pump switch tube M2 is switched off; the charge pump switch tube M3 is closed, the charge pump switch tube M4 is conducted, and the voltage of 2 × VDD is transmitted to V1 through the charge pump switch tube M4; when the CLK signal is low, the CLKN signal is high; the charge pump switch tube M2 is switched on, and the charge pump switch tube M1 is switched off; the charge pump switch tube M4 is closed, the charge pump switch tube M3 is conducted, and the voltage of 2 × VDD is transmitted to V1 through the charge pump switch tube M3; i.e., the voltage V1 is maintained at 2 times the VDD voltage.
Further, the first clamping unit is a zener diode, and the second clamping unit is a series connection of MOS transistors; or, the second clamping unit is a zener diode, and the first clamping unit is formed by serially connecting MOS transistors.
Further, the first clamping unit and/or the second clamping unit are/is N transistors which are connected in series, and the grid electrodes and the drain electrodes of the N transistors are connected.
Further, the control circuit for preventing hot plug during charging of the high-voltage lithium battery is characterized by further comprising a control switch MLC2 and a VIN overvoltage detection module: when the power supply VIN is higher than the second voltage threshold, the over-voltage detection circuit generates an over-voltage signal to trigger the control switch MLC2, so that the voltage of the high-voltage power supply V1 is shorted to the ground terminal to turn off the high-voltage transistor MHV1.
Further, the VIN overvoltage detection module includes a low-voltage transistor MLV2, a second comparator, a resistor R4, and a resistor R5, and a negative input terminal of the comparator is connected to a reference voltage VREF1; the resistor R4 and the resistor R5 are connected in series between a power supply VIN and a grounding end, and the positive input end of the comparator is connected with the connection point of the resistor R4 and the resistor R5.
According to the technical scheme, the control circuit for preventing hot plug in the high-voltage lithium battery charging avoids damage of overvoltage pulses to low-voltage devices in a chip caused by hot plug by controlling the value of the clamping voltage of the G end of the high-voltage transistor when the battery is fully charged in the prior art through adding the control circuit of the internal high-voltage charging device, so that the service life of the chip is prolonged, and the effect of reducing the cost of the chip is realized.
Drawings
FIG. 1 is a schematic diagram of a control circuit for preventing hot plug during charging of a high voltage lithium battery in the prior art
FIG. 2 is a schematic diagram of the peak voltage of VIN during hot swap of the control circuit shown in FIG. 1
FIG. 3 is a schematic diagram of a control circuit for preventing hot plugging in charging a high voltage lithium battery according to a preferred embodiment of the present invention
FIG. 4 is a schematic diagram of a clamp circuit in the control circuit for preventing hot plug in charging of the high voltage lithium battery according to the embodiment of the present invention
FIG. 5 is a schematic diagram of the peak voltage of VIN during hot swap of the control circuit shown in FIG. 4 according to the present invention
FIG. 6 is a schematic diagram of another control circuit for preventing hot plug during charging of a high voltage lithium battery according to an embodiment of the present invention
FIG. 7 is a schematic diagram illustrating the peak voltage of VIN during hot swap in the embodiment of FIG. 6 of the present invention
Detailed Description
The following describes in further detail embodiments of the present invention with reference to fig. 3-7.
It should be noted that the greatest difference between the present invention and the prior art is: in the control circuit for preventing hot plug in and out of high-voltage lithium battery charging, a battery full charge detection module is added, and when the battery is nearly full, the battery full charge detection module reduces the voltage V1 of a charging power supply through a control switch MLC 1; furthermore, a VIN overvoltage detection module can be added, when the VIN voltage is higher than a certain voltage, an overvoltage signal is generated by the overvoltage detection circuit, and the voltage of V1 is shorted to the ground terminal GND by controlling the switch MLC 2.
Referring to fig. 3, fig. 3 is a schematic diagram illustrating a control circuit for preventing hot plug during charging of a high voltage lithium battery according to a preferred embodiment of the present invention. As shown in fig. 3, the control circuit for preventing hot plug in high voltage lithium battery charging comprises a charge pump module for converting a power voltage VDD into a high voltage power supply V1, a clamp module, a control switch MLC1, a high voltage tube MHV1, an LDO module, and a battery full charge detection circuit.
In the embodiment of the present invention, the charge pump module in the prior art can be used. For example, as shown in fig. 3, the charge pump module may include an oscillator module, a capacitor C1, a capacitor C2, a charge pump switch M1, a charge pump switch M2, a charge pump switch M3, and a charge pump switch M4; the oscillator module generates a CLK signal and a CLKN signal, wherein the CLKN signal is an inverted signal of the CLK signal; when the CLK signal is high, the CLKN signal is low; the charge pump switch tube M1 is switched on, and the charge pump switch tube M2 is switched off; the charge pump switch tube M3 is turned off, the charge pump switch tube M4 is turned on, and 2 × vdd voltage is transmitted to V1 through the charge pump switch tube M4; when the CLK signal is low, the CLKN signal is high; the charge pump switch tube M2 is switched on, and the charge pump switch tube M1 is switched off; the charge pump switch tube M4 is closed, the charge pump switch tube M3 is conducted, and the voltage of 2 × VDD is transmitted to V1 through the charge pump switch tube M3; thus, V1 can maintain 2 times the VDD voltage.
The clamping module is used for limiting the high-voltage power supply V1 to a fixed voltage. The high-voltage power supply control circuit comprises a first clamping unit and a second clamping unit which are sequentially connected between a high-voltage power supply V1 and a ground terminal in series, wherein the source electrode of a control switch MLC1 is connected with the connection point of the first clamping unit and the second clamping unit, and the drain electrode of the control switch MLC is grounded.
The first clamping unit and the second clamping unit may be different from each other. Referring to fig. 4, fig. 4 is a schematic diagram of a clamping circuit in a control circuit for preventing hot plug for charging a high voltage lithium battery according to an embodiment of the present invention. The first clamping unit and/or the second clamping unit may be a zener diode. In addition, the clamping module can also be generated by connecting the Gate and source Drain ends of the transistor in series as shown in fig. 4; or the Zener diode is connected with the grid electrode Gate and the source electrode Drain end of the common MOS transistor in series.
The source electrode of the control switch MLC1 is connected with the connection point of the first clamping unit and the second clamping unit, the drain electrode is grounded, the source electrode of the high-voltage tube MHV1 is connected with a power supply VIN, the drain electrode of the high-voltage tube MHV1 is connected with a power supply V2, and the grid electrode of the high-voltage tube MHV1 is connected with the high-voltage power supply V1; the LDO module is used for converting the voltage of the power supply V2 into a charging voltage VBAT and controlling the battery to be charged normally; the battery full charge detection circuit is used for detecting the charging state of the battery.
When the battery is in a charging state and a power supply VIN is low voltage, the high-voltage transistor MHV1 is conducted, and V2= VIN; when the battery is in a full-charge state, the battery full-charge detection circuit outputs a high level signal to the control switch MLC1, the control switch MLC1 is turned on, and the control switch MLC1 is in short circuit with the second clamping unit to reduce the voltage of the high-voltage power supply V1 so as to protect the LDO module.
Specifically, the battery full charge detection module includes a low voltage transistor MLV1, a comparator, a low voltage transistor MLV2 having a resistor R3 mirrored to the low voltage transistor MLV1, and is configured to mirror a current of the low voltage transistor MLV1, that is, a current passing through the low voltage transistor MLV2 is IMV2= k × IMV1; the low-voltage transistor MLV2 is connected to the gate of the low-voltage transistor MLV1, the source of the low-voltage transistor MLV2 is connected to the power supply V2, the resistor R3 is connected between the drain of the low-voltage transistor MLV2 and the positive input end and the ground end of the comparator, and the negative input end of the comparator is connected to the reference voltage VREF1.
When the IMV2 × R3< VREF1, the battery reaches the first voltage threshold, the comparator outputs a high level signal to the control switch MLC1, the control switch MLC1 is turned on, and the control switch MLC1 short-circuits the second clamping unit to reduce the voltage of the high-voltage power supply V1.
Referring to fig. 5, fig. 5 is a schematic diagram illustrating a peak voltage of VIN during hot plugging of the control circuit shown in fig. 4 according to the present invention. In the embodiment of the invention, through the newly added battery full charge detection circuit, in order to ensure that the MHV1 of the high-voltage tube does not generate a large amount of power consumption in the power supply process during normal charging application, the voltage of the G end (Gate) of the MHV1 of the general high-voltage tube is higher than the VIN voltage, so that the MHV1 works in a deep linear region and is ensured to be fully conducted; however, when the charging is nearly completed, the voltage V1 at the G-terminal of the high-voltage tube MHV1 is greatly reduced by passing through the short-circuit clamping unit.
Since the voltage of V1 is greatly reduced at this time, the high-voltage tube MHV1 can work in a linear region or a saturation region, although the voltage of V2 can also generate a spike pulse, the highest voltage of the spike pulse can reach the voltage value of V1-VGS, but the voltage of V1 is greatly reduced. Therefore, the embodiment of the invention can ensure the withstand voltage requirement of the low-voltage device in the LDO module, and can not cause damage to the chip in the hot plugging process.
Referring to fig. 6, fig. 6 is a schematic diagram of another control circuit for preventing hot plug during charging of a high voltage lithium battery according to an embodiment of the present invention. As shown in fig. 6, in this embodiment, the control circuit for preventing hot plug in and out of charging of the high voltage lithium battery includes a control switch MLC2 and a VIN overvoltage detection module, in addition to a charge pump module for converting a power voltage VDD into a high voltage power V1, a clamp module, a control switch MLC1, a high voltage tube MHV1, an LDO module, and a battery full charge detection circuit; when the power supply VIN is higher than the second voltage threshold, the over-voltage detection circuit generates an over-voltage signal to trigger the control switch MLC2, so that the voltage of the high-voltage power supply V1 is shorted to the ground terminal to turn off the high-voltage transistor MHV1.
Also, a battery full charge detection circuit is used for detecting the charging state of the battery; when the battery is in a charging state, the high-voltage transistor MHV1 is turned on, and V2= VIN; the battery full charge detection circuit outputs a high level signal to the control switch MLC1, the control switch MLC1 is started, and the control switch MLC1 is in short circuit with the second clamping unit to reduce the voltage of the high-voltage power supply V1 so as to protect the LDO module.
Specifically, in the embodiment of the present invention, the VIN overvoltage detection module includes a low-voltage transistor MLV2, a second comparator, a resistor R4, and a resistor R5, where a negative input of the comparator is connected to a reference voltage VREF1; the resistor R4 and the resistor R5 are connected in series between a power supply VIN and a grounding end, and the positive input end of the comparator is connected with the connection point of the resistor R4 and the resistor R5.
Referring to fig. 7, fig. 7 is a schematic diagram illustrating a peak voltage of VIN during hot plugging according to the embodiment of the invention shown in fig. 6. As shown in fig. 7, in normal charging application, in order to ensure that the high-voltage tube does not generate a large amount of power consumption in the power supply process, the voltage of the G terminal (Gate) of the high-voltage transistor MHV1 is generally higher than the VIN voltage, so that the high-voltage transistor MHV1 works in a deep linear region to ensure that the high-voltage transistor MHV is fully turned on; however, when the charging is nearly completed, the voltage V1 at the G terminal (Gate) is greatly reduced by passing through the second clamping unit.
That is, if the VIN-side power supply is hot-plugged, the action will cause a spike of higher voltage to be generated instantaneously. Since the voltage of V1 is greatly reduced, the high voltage transistor MHV1 can operate in a linear region or a saturation region, and although the voltage of V2 also generates a spike pulse, the maximum voltage of the spike pulse may reach the voltage value of V1-VGS, the voltage of V1 is greatly reduced. Therefore, the voltage withstanding requirement of low-voltage devices in the LDO module is met, and the chip is not damaged in the hot plugging process.
In addition, in order to further protect the chip from the influence of the VIN voltage overcharge pulse voltage of the power supply, by adding a VIN overvoltage detection module in this embodiment, when the VIN overvoltage detection module is higher than a certain voltage in the hot plugging process, the MHV1 of the high-voltage transistor can be directly turned off through the MLC2 tube, so as to further protect the internal circuit (LDO module).
The above description is only for the preferred embodiment of the present invention, and the embodiment is not intended to limit the scope of the present invention, so that all the equivalent structural changes made by using the contents of the description and the drawings of the present invention should be included in the scope of the present invention.
Claims (7)
1. The utility model provides a control circuit that high voltage lithium battery charging prevented hot plug which characterized in that includes:
the charge pump module is used for converting a power supply voltage VDD into a high-voltage power supply V1;
the clamping module comprises a first clamping unit and a second clamping unit which are sequentially connected between the high-voltage power supply V1 and a ground terminal in series and used for limiting the high-voltage power supply V1 to a fixed voltage;
a control switch MLC1, wherein the source electrode of the control switch MLC1 is connected with the connection point of the first clamping unit and the second clamping unit, and the drain electrode of the control switch MLC1 is grounded;
the source electrode of the high-voltage tube MHV1 is connected with a power supply VIN, the drain electrode of the high-voltage tube MHV1 is connected with a power supply V2, and the grid electrode of the high-voltage tube MHV1 is connected with the high-voltage power supply V1;
the LDO module is used for converting the voltage of the power supply V2 into a charging voltage VBAT and controlling the battery to be normally charged;
a battery full charge detection circuit for detecting a charged state of the battery; wherein, the first and the second end of the pipe are connected with each other,
when the battery is in a charging state, the high-voltage transistor MHV1 is conducted, and V2= VIN; when the battery is in a full-charge state, the battery full-charge detection circuit outputs a high level signal to the control switch MLC1, the control switch MLC1 is turned on, and the control switch MLC1 is in short circuit with the second clamping unit to reduce the voltage of the high-voltage power supply V1 so as to protect the LDO module.
2. The control circuit for preventing hot plug in high voltage lithium battery charging according to claim 1, wherein the battery full charge detection module comprises a low voltage transistor MLV1, a first comparator, a low voltage transistor MLV2 having a resistor R3 mirrored to the low voltage transistor MLV1 for mirroring the current of the low voltage transistor MLV1 thereof, i.e. the current passing through the low voltage transistor MLV2 is IMV2= k × IMV1; the low-voltage transistor MLV2 is connected to the gate of the low-voltage transistor MLV1, the source of the low-voltage transistor MLV2 is connected to the power supply V2, the resistor R3 is connected between the drain of the low-voltage transistor MLV2 and the positive input end and the ground end of the comparator, and the negative input end of the comparator is connected to a reference voltage VREF1;
when the IMV2 × R3< VREF1, that is, when the battery full charge detection circuit detects that the charging current is less than a certain threshold, the battery reaches the first voltage threshold, the comparator outputs a high level signal to the control switch MLC1, the control switch MLC1 is turned on, and the control switch MLC1 short-circuits the second clamping unit to reduce the voltage of the high-voltage power supply V1.
3. The control circuit for preventing hot plug in charging of a high voltage lithium battery as claimed in claim 1, wherein the charge pump module comprises an oscillator module, a capacitor C1, a capacitor C2, a charge pump switch tube M1, a charge pump switch tube M2, a charge pump switch tube M3 and a charge pump switch tube M4; the oscillator module generates a CLK signal and a CLKN signal, wherein the CLKN signal is an inverted signal of the CLK signal; when the CLK signal is high, the CLKN signal is low; the charge pump switch tube M1 is switched on, and the charge pump switch tube M2 is switched off; the charge pump switch tube M3 is closed, the charge pump switch tube M4 is conducted, and the voltage of 2 × VDD is transmitted to V1 through the charge pump switch tube M4; when the CLK signal is low, the CLKN signal is high; the charge pump switch tube M2 is switched on, and the charge pump switch tube M1 is switched off; the charge pump switch tube M4 is closed, the charge pump switch tube M3 is conducted, and the voltage of 2 × VDD is transmitted to V1 through the charge pump switch tube M3; i.e., the voltage V1 is maintained at 2 times the VDD voltage.
4. The control circuit for preventing hot plug in high voltage lithium battery charging according to claim 3, wherein the first clamping unit is a zener diode, and the second clamping unit is a series connection of MOS transistors; or, the second clamping unit is a zener diode, and the first clamping unit is a series connection of MOS transistors; or the first clamping unit and the second clamping unit are both zener diodes.
5. The control circuit for preventing hot plug in high voltage lithium battery charging according to claim 1, wherein the first clamping unit and/or the second clamping unit are N transistors connected in series, and the gates and the drains of the N transistors are connected.
6. The control circuit for preventing hot plug in charging of a high voltage lithium battery as claimed in claim 1, further comprising a control switch MLC2 and a VIN overvoltage detection module: when the power supply VIN is higher than the second voltage threshold, the over-voltage detection circuit generates an over-voltage signal to trigger the control switch MLC2, so that the voltage of the high-voltage power supply V1 is shorted to the ground end, so as to turn off the high-voltage transistor MHV1.
7. The control circuit for preventing hot plug in charging of a high voltage lithium battery as claimed in claim 6, wherein the VIN overvoltage detection module comprises a low voltage transistor MLV2, a second comparator, a resistor R4 and a resistor R5, and a negative input terminal of the comparator is connected to a reference voltage VREF1; the resistor R4 and the resistor R5 are connected in series between a power supply VIN and a grounding end, and the positive input end of the comparator is connected with the connection point of the resistor R4 and the resistor R5.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211300157.7A CN115622183A (en) | 2022-10-24 | 2022-10-24 | Control circuit for preventing hot plug during charging of high-voltage lithium battery |
| PCT/CN2023/090236 WO2024087550A1 (en) | 2022-10-24 | 2023-04-24 | Control circuit for preventing hot swapping during high-voltage lithium battery charging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211300157.7A CN115622183A (en) | 2022-10-24 | 2022-10-24 | Control circuit for preventing hot plug during charging of high-voltage lithium battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115622183A true CN115622183A (en) | 2023-01-17 |
Family
ID=84864101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211300157.7A Pending CN115622183A (en) | 2022-10-24 | 2022-10-24 | Control circuit for preventing hot plug during charging of high-voltage lithium battery |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN115622183A (en) |
| WO (1) | WO2024087550A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024087550A1 (en) * | 2022-10-24 | 2024-05-02 | 上海裕芯电子科技有限公司 | Control circuit for preventing hot swapping during high-voltage lithium battery charging |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6465996B2 (en) * | 2000-03-08 | 2002-10-15 | Denso Corporation | Constant voltage circuit with a substitute circuit in case of input voltage lowering |
| CN105244970B (en) * | 2015-11-06 | 2017-08-29 | 无锡中感微电子股份有限公司 | Charging circuit |
| CN113852060A (en) * | 2021-11-25 | 2021-12-28 | 江苏长晶科技有限公司 | Active hot plug input protection circuit |
| CN115622183A (en) * | 2022-10-24 | 2023-01-17 | 上海裕芯电子科技有限公司 | Control circuit for preventing hot plug during charging of high-voltage lithium battery |
-
2022
- 2022-10-24 CN CN202211300157.7A patent/CN115622183A/en active Pending
-
2023
- 2023-04-24 WO PCT/CN2023/090236 patent/WO2024087550A1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024087550A1 (en) * | 2022-10-24 | 2024-05-02 | 上海裕芯电子科技有限公司 | Control circuit for preventing hot swapping during high-voltage lithium battery charging |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024087550A1 (en) | 2024-05-02 |
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