CN114039587B - Shutdown control circuit, battery protection chip and electronic equipment - Google Patents
Shutdown control circuit, battery protection chip and electronic equipment Download PDFInfo
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- CN114039587B CN114039587B CN202210026365.6A CN202210026365A CN114039587B CN 114039587 B CN114039587 B CN 114039587B CN 202210026365 A CN202210026365 A CN 202210026365A CN 114039587 B CN114039587 B CN 114039587B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/30—Modifications for providing a predetermined threshold before switching
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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
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect 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
- H02J7/007—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
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/28—Modifications for introducing a time delay before switching
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/20—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits characterised by logic function, e.g. AND, OR, NOR, NOT circuits
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Abstract
The application belongs to the technical field of electronic circuits, and particularly relates to a shutdown control circuit, a battery protection chip and an electronic device, wherein the shutdown control circuit comprises a switch, the switch and a load circuit are connected in series between a positive electrode and a negative electrode of a power supply, the shutdown control circuit further comprises a control circuit, a driving circuit and a shutdown detection circuit, the shutdown control is realized according to an external shutdown instruction through the control circuit, the shutdown control is realized through the driving circuit when the power supply is under-voltage, the voltage at a connecting node of the load circuit and the switch is continuously detected through the shutdown detection circuit, a power supply loop of the load circuit is maintained in a disconnected state before the load circuit is completely powered off, the shutdown control is reliably realized through the control circuit, the shutdown control circuit improves the reliability of the shutdown control, and effectively reduces the consumption of the circuit, is beneficial to the miniaturization of the electronic equipment.
Description
Technical Field
The application belongs to the technical field of electronic circuits, and particularly relates to a shutdown control circuit, a battery protection chip and an electronic device.
Background
With the development of integrated circuit technology, consumer electronic products tend to be miniaturized, more functional modules are packaged and limited in a smaller space, the volume and capacity of a rechargeable battery built in the electronic product are greatly limited, and even smaller functional modules tend to be packaged, and the electric quantity of the electronic product needs to be consumed in a standby state to be smaller so as to prolong the standby time of the electronic product, so that the circuit needs to be better controlled for the standby power consumption of the whole miniature electronic system.
Disclosure of Invention
In view of this, the embodiment of the present application provides a shutdown control circuit, a battery protection chip, and an electronic device, and aims to solve the problem that a conventional shutdown control circuit cannot be reliably shut down when a load is not powered down.
A first aspect of the embodiments of the present application provides a shutdown control circuit, including a switch, the switch is connected in series with a load circuit between a positive electrode and a negative electrode of a power supply, and is characterized in that the shutdown control circuit further includes:
the control circuit is used for receiving an external shutdown instruction, and outputting a shutdown driving signal according to the external shutdown instruction;
the driving circuit is connected to the control circuit and the switch and used for detecting whether the power supply is under-voltage or not and driving the switch to be switched off when the power supply is under-voltage and/or receiving the shutdown driving signal; and
a detection end of the shutdown detection circuit is connected to a connection node of the load circuit and the switch, an output end of the shutdown detection circuit is connected to the control circuit, and the shutdown detection circuit is used for continuously detecting the voltage at the connection node;
the shutdown detection circuit outputs a first shutdown logic signal to the control circuit when detecting that the voltage at the connection node is below a first preset voltage value, and the control circuit is further configured to keep outputting the shutdown driving signal according to the first shutdown logic signal until the voltage at the connection node is greater than the first preset voltage value.
In one embodiment, the shutdown detection circuit is further configured to output a second shutdown logic signal indicating that the load circuit is completely powered down when detecting that the voltage at the connection node is greater than the first preset voltage value, and the control circuit is further configured to stop outputting the shutdown driving signal when receiving the second shutdown logic signal.
In one embodiment, the output terminal of the shutdown detection circuit is connected to an external device, and the second shutdown logic signal is further used to control the external device to shutdown, where the external device includes the load circuit and/or a device other than the load circuit.
In one embodiment, the external shutdown command is generated by the load circuit or the external device.
In one embodiment, the shutdown control circuit further comprises a reset circuit;
the reset circuit is connected with the control circuit and is used for initializing the control circuit to a shutdown detection state when the load circuit is powered on; and
the reset circuit is further configured to initialize to a shutdown detection state after the control circuit receives the second shutdown logic signal.
In one embodiment, the shutdown detection circuit includes a hysteresis comparator, an input terminal of the hysteresis comparator is connected to a connection node of the load circuit and the switch, and an output terminal of the hysteresis comparator is connected to the control circuit.
In one embodiment, the driving circuit comprises a detection circuit, a delay logic unit, a delay unit and a driving unit;
the detection circuit is connected to the power supply and used for detecting the voltage of the power supply and outputting an undervoltage signal when the voltage of the power supply is lower than a second preset voltage;
the delay logic unit outputs a shutdown signal according to the undervoltage signal;
the delay unit is used for delaying the shutdown signal for a first preset time length and then outputting the shutdown signal;
the driving unit outputs a driving signal to the switch according to the shutdown signal.
In one embodiment, the delay logic unit comprises a first nor gate, a first not gate, a second nor gate and a second not gate;
a first input end of the first nor gate is used for receiving the undervoltage signal, a second input end of the first nor gate is connected with a first output end of the control circuit, an output end of the first nor gate is connected with an input end of the first nor gate, an output end of the first nor gate is connected with a first input end of the second nor gate, a second input end of the second nor gate is connected with a second output end of the control circuit, an output end of the second nor gate is connected with an input end of the second not gate, and an output end of the second not gate is connected with the delay unit;
the delay unit comprises a timer, a first NAND gate and a third NAND gate;
a first input end of the first nand gate is connected with the delay logic unit and the input end of the timer, an output end of the timer is connected with a second input end of the first nand gate, an output end of the first nand gate is connected with an input end of the third not gate, and an output end of the third not gate is connected with the driving unit;
the driving unit comprises a driver, an input end of the driver is used for receiving the shutdown signal, and an output end of the driver is connected with the switch and the control circuit.
A second aspect of the embodiments of the present application provides a battery protection chip, including the shutdown control circuit of any one of the embodiments, where the load circuit is a device powered by a battery.
A third aspect of an embodiment of the present application provides an electronic device, including the shutdown control circuit in any of the above embodiments.
This application compares beneficial effect with traditional technical scheme is: realize realizing through control circuit and realizing according to outside shutdown instruction shutdown control, realize when the power is undervoltage through drive circuit, drive control circuit realizes shutdown control, still last the voltage that detects the connected node department of load circuit and switch through shutdown detection circuitry, all let load circuit's power supply circuit maintain the off-state before load circuit falls completely, realize that control circuit realizes shutdown control reliably, the shutdown control circuit of this application improves shutdown control's reliability, effectively reduce the consumption of circuit, be favorable to electronic equipment's miniaturization.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a circuit schematic diagram of a shutdown control circuit according to an embodiment of the present disclosure;
fig. 2 is a circuit schematic diagram of a shutdown control circuit according to an embodiment of the present disclosure;
fig. 3 is a circuit schematic diagram of a shutdown control circuit including a reset circuit according to an embodiment of the present application;
fig. 4 is a circuit schematic diagram of a shutdown control circuit according to an embodiment of the present application;
fig. 5 is a schematic circuit diagram of a shutdown control circuit according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
With the development of integrated circuit technology, consumer electronic products tend to be miniaturized, more functional modules are packaged and limited in a smaller space, the volume and capacity of a rechargeable battery built in the electronic product are greatly limited, and even smaller functional modules tend to be packaged, and the electric quantity of the electronic product needs to be consumed in a standby state to be smaller so as to prolong the standby time of the electronic product, so that the circuit needs to be better controlled for the standby power consumption of the whole miniature electronic system.
Referring to fig. 1, a first aspect of the embodiments of the present application provides a shutdown control circuit, including a switch 400, where the switch 400 and a load circuit 500 are connected in series between a positive electrode and a negative electrode of a power supply 600, the shutdown control circuit further includes a control circuit 100, a driving circuit 200, and a shutdown detection circuit 300, where the control circuit 100 is configured to receive an external shutdown instruction, the control circuit 100 outputs a shutdown driving signal according to the external shutdown instruction, the driving circuit 200 is connected to the control circuit 100 and the switch 400 and is configured to detect whether the power supply 600 is under-voltage, the power supply 600 is, for example, a battery, when the power supply 600 is under-voltage and/or receives the shutdown driving signal, the driving circuit 200 drives the switch 400 to be turned off, a detection end of the shutdown detection circuit 300 is connected to a connection node between the switch 400 and the load circuit 500, the shutdown detection circuit 300 is configured to continuously detect a voltage at the connection node between the switch 400 and the load circuit 500, when it is detected that the voltage connected to the connection node is below a first preset voltage value, a first shutdown logic signal is output to the control circuit 100, and the control circuit 100 is further configured to output a shutdown driving signal according to the first shutdown logic signal until the voltage at the connection node is greater than the first preset voltage value, where the first preset voltage value is, for example, 90% of the power supply voltage value, which indicates that the voltage at the connection node is close to the power supply voltage value, that is, the load circuit 500 is considered to have been powered down completely.
The shutdown control circuit that the first aspect of the embodiment of the present application provided, realize through control circuit 100 that shutdown control is realized according to outside shutdown instruction, realize when power 600 is undervoltage through drive circuit 200, drive control circuit 100 realizes shutdown control, still last the voltage that detects the connected node department of load circuit 500 and switch 400 through shutdown detection circuit 300, realize that control circuit 100 realizes shutdown control reliably, the shutdown control circuit of this application improves the reliability of shutdown control, effectively reduce the consumption of circuit, be favorable to electronic equipment's miniaturization.
In one embodiment, the shutdown detection circuit 300 is further configured to output a second shutdown logic signal indicating that the load circuit 500 is completely powered down when detecting that the voltage at the connection node between the switch 400 and the load circuit 500 is greater than the first preset voltage value, and the control circuit 100 is further configured to stop outputting the shutdown driving signal when receiving the second shutdown logic signal.
Referring to fig. 2, in an embodiment, an output end of the shutdown detection circuit 300 is connected to an external device, and the second shutdown logic signal is further used to control the shutdown of the external device, where the external device includes the load circuit 500 and/or other devices except the load circuit 500, and the output end of the shutdown detection circuit 300 is connected to the other devices, so as to improve compatibility of the shutdown control circuit.
In one embodiment, the external shutdown instruction is generated by the load circuit 500 or an external device, and the control circuit 100 may receive the shutdown instruction generated by the load circuit 500 or the shutdown instruction generated by other external devices, thereby improving the compatibility of the shutdown control circuit.
Referring to fig. 3, in an embodiment, the shutdown control circuit further includes a reset circuit 700, where the reset circuit 700 is connected to the control circuit 100 and is used to initialize the control circuit 100 to a shutdown detection state when the load circuit 500 is powered on, where the shutdown detection state refers to a state where the control circuit 100 is initialized to wait for an external shutdown instruction to be detected, and
the reset circuit 700 is further configured to initialize the control circuit 100 to the shutdown detection state after the control circuit 100 receives the second shutdown logic signal from the shutdown detection circuit 300, where the second shutdown logic signal of the shutdown detection circuit 300 indicates that the load circuit 500 is completely conductive, and at this time, the reset circuit 700 initializes the control circuit 100 to the shutdown detection state, where the shutdown detection state also refers to a state to be detected where the control circuit 100 is initialized to wait for an external shutdown instruction, so as to increase compatibility of the shutdown control circuit in this application, that is, the entire circuit state may be initialized when the load circuit 500 is powered on, or the entire circuit state may be initialized after the load circuit 500 is completely powered off.
Referring to fig. 5, in one embodiment, the shutdown detection circuit 300 includes a hysteresis comparator 310, an input terminal of the hysteresis comparator 310 is connected to a connection node, i.e., a point a, of the load circuit 500 and the switch 400, an output terminal of the hysteresis comparator 310 is connected to the control circuit 100, and the hysteresis comparator 310 continuously detects a voltage at the connection node, i.e., a point a, of the load circuit 500 and the switch 400 and outputs a logic signal according to a voltage value at the connection node, i.e., a point a. The voltage at the connection node, i.e., the point a, represents the divided voltage of the loop formed by the load circuit 500 and the ground, the divided voltage is closer to the voltage value of the power supply 600, i.e., VDD, to which the load circuit 500 is connected after the load circuit 500 starts to power down, the voltage value at the connection node, i.e., the point a, reaches a certain proportion, for example, 90% of the voltage value of VDD, and the load circuit 500 is considered to be completely powered down, and the hysteresis comparator 310 outputs the logic value of the corresponding logic signal SDOUT, so that reliable detection of whether the load circuit 500 is completely powered down is realized.
Referring to fig. 4, in an embodiment, the driving circuit 200 includes a detection circuit 210, a delay logic unit 220, a delay unit 230, and a driving unit 240, where the detection circuit 210 is connected to the power supply 600 and is configured to detect a voltage of the power supply 600, and output an under-voltage signal when the voltage of the power supply 600 is lower than a second preset voltage, the delay logic unit 220 outputs a shutdown signal according to the under-voltage signal output by the detection circuit 210, and the delay unit 230 is configured to delay the shutdown signal output by the delay logic unit 220 for a first preset duration, where the first preset duration may be set by a timer, for example, the preset duration is 50ms, and the driving unit 240 drives the switch 400 to turn off according to the shutdown signal output by the delay unit 230.
Referring to fig. 5, in one embodiment, the detection circuit 210 may be a voltage comparator, and when it is detected that the voltage of the power supply 600 is lower than a second preset voltage value, the logic value of the logic signal VBATLOW for outputting the under-voltage signal is 1, otherwise, the logic value of the logic signal VBATLOW for outputting the under-voltage signal is 0, where the second preset voltage value is, for example, 60% of the standard voltage value of the power supply 600, that is, when the voltage of the power supply 600 is lower than 60% of the standard voltage value, the power supply 600 may be considered to be in the under-voltage state, the voltage of the power supply 600 is detected by the detection circuit 210, and when the power supply 600 is in the under-voltage state, the under-voltage signal is detected and output in time, so as to prevent the power supply 600 from being lost due to too low voltage, and also ensure that the load circuit 500 operates in a stable voltage environment, and further improve the stability and reliability of the circuit.
Referring to fig. 5, in one embodiment, the delay logic unit 220 includes a first nor gate 221, a first nor gate 222, a second nor gate 223, and a second not gate 224, a first input terminal of the first nor gate 221 is configured to receive the under-voltage signal, a second input terminal of the first nor gate 221 is connected to the control circuit 100, an output terminal of the first nor gate 221 is connected to an input terminal of the first not gate 222, an output terminal of the first not gate 222 is connected to a first input terminal of the second nor gate 223, a second input terminal of the second nor gate 223 is connected to the control circuit 100, an output terminal of the second nor gate 223 is connected to an input terminal of the second not gate 224, and an output terminal of the second not gate 224 is connected to the delay unit 230.
Referring to fig. 5, the delay unit 230 includes a timer 231, a first nand gate 232, and a third nand gate 233, a first input of the first nand gate 232 is connected to the delay logic unit 220 and to an input of the timer 231, an output of the timer 231 is connected to a second input of the first nand gate 232, an output of the first nand gate 232 is connected to an input of the third nand gate 233, and an output of the third nand gate 233 is connected to the driving unit 240, wherein the timer 231 can set a first preset time duration, for example, 50ms, so that the delay unit 230 delays the shutdown signal for a certain time, and the reliability that the detection circuit 210 detects the power supply 600 is under-voltage is ensured.
Referring to fig. 5, the driving unit 240 includes a driver 241, an input of the driver 241 is used for receiving the shutdown signal, and an output of the driver 241 is connected to the switch 400 and connected to the control circuit 100.
Referring to fig. 5, in an embodiment, the switch 400 may be a switch Q1, a first end of the switch Q1 is connected to the load circuit 500, a second conducting end of the switch Q1 is grounded, a control end of the switch Q1 is connected to the output end of the driver 241, the switch Q1 is in a low-impedance path when being turned on and in a high-impedance state when being turned off, and different voltage values may be generated at a connection node between the load circuit 500 and the switch 400 by turning on or off the switch Q1.
Referring to fig. 5, in an embodiment, the load circuit 500 is a resistance-capacitance type load, and the load circuit 500 includes a resistance-capacitance load network equivalent to any size, that is, the shutdown control circuit of the present application can adapt to various resistance-capacitance type load conditions of different sizes.
The embodiment of the application provides a shutdown control circuit for a load control circuit (such as a lithium battery protection chip), which can be adaptive to various resistance-capacitance load conditions with different sizes, and can maintain a power supply loop of the load circuit in a disconnected state before the load circuit is completely powered down, reliably realize shutdown function of the protection circuit and current consumption of a shutdown circuit.
To better explain the working principle of the shutdown control circuit of the present application, please refer to fig. 5 in combination with a specific working scenario below, the shutdown control circuit of the present application includes a control circuit 100, a driving circuit 200, and a shutdown detection circuit 300, the switch 400 includes a switching tube Q1, the load circuit 500 is an equivalent resistance-capacitance type load, which includes an equivalent resistance and an equivalent capacitance, the load circuit 500 and the switch 400 are connected in series between the positive and negative electrodes of the power supply, and the power supply 600 is a battery.
Referring to fig. 5, when the entire circuit is in the normal state where the switch 400 is turned on, if no voltage drop of the power supply 600 is detected, that is, the logic value of the logic signal VBATLOW output by the detection circuit 210 is 0, at this time, if the logic value of the external shutdown command signal SDIN is 1 and the time duration set by the delay unit 230 is maintained to be longer than the time duration set by the delay unit 230, the driving circuit 200 drives the switching tube Q1 to turn off the switch 400, so that the switch 400 is in the off-state, since the switch 400 is turned off, the voltage value at the connection node a continuously rises under the pull-up action of the load circuit 500, the shutdown detection circuit 300 continuously detects whether the voltage value of the connection node a exceeds the first preset voltage value, and when the voltage of the connection node a exceeds the first preset voltage value, the shutdown detection circuit 300 outputs the first shutdown logic signal SDOUT with the logic value of 1, when the load circuit 500 is completely powered off, the control circuit 100 controls the control object circuit to perform a shutdown operation, and the control object circuit may include the whole circuit of the shutdown control circuit. Even if the logic value of the external shutdown command cancel restoration logic signal SDIN is 0, the state of the switch 400 is not changed until the shutdown detection circuit 300 does not detect a complete power down of the load circuit 500, and the entire circuit is always maintained in the shutdown state close to zero consumption.
In one embodiment, an external shutdown command of the shutdown control circuit, i.e., a logic level of the logic signal SDIN, may be supported to be generated by the load circuit 500, i.e., the logic level of the logic signal SDIN supports the same power rail across the load circuit 500.
In one embodiment, when the switch 400 is in the on normal state, the logic value of the logic signal SDOUT output by the shutdown detection circuit 300 is 0, and at this time, if no under-voltage of the power supply 600 is detected, that is, the logic value of the logic signal VBATLOW is 0, when an external shutdown command, that is, the logic value of the logic signal SDIN is 1 is detected and the time length set by the delay unit 230 is maintained, the driving circuit 200 drives the switching tube Q1 to turn off the switch 400, and at this time, the load circuit 500 becomes the off-state with the power supply 600, but whether the load circuit 500 is completely powered down or is powered down is determined by the characteristics of the load circuit 500 itself, the voltage value at the connection node a is continuously detected by the shutdown detection circuit 300 during the power-down or power-down of the load circuit 500, and when the voltage at the connection node a exceeds a first preset voltage value, that is determined that the load circuit 500 is completely powered down, at this time, the logic value of the logic signal SDOUT of the shutdown detection circuit 300 is 1, the control circuit 100 controls the circuit to be controlled to perform the shutdown operation. Before the complete power-down of the load circuit 500 is not detected, the external shutdown command, i.e., the logic value of the logic signal SDIN, is changed to 0 in time, and the state of the switch 400 is not changed, so that the whole circuit is always maintained in the off state close to zero consumption.
This application compares beneficial effect with traditional technical scheme is: realize realizing through control circuit and realizing according to outside shutdown instruction shutdown control, realize when the power is undervoltage through drive circuit, drive control circuit realizes shutdown control, still last the voltage that detects the connected node department of load circuit and switch through shutdown detection circuitry, all let load circuit's power supply circuit maintain the off-state before load circuit falls completely, realize that control circuit realizes shutdown control reliably, the shutdown control circuit of this application improves shutdown control's reliability, effectively reduce the consumption of circuit, be favorable to electronic equipment's miniaturization.
A second aspect of the embodiments of the present application provides a battery protection chip, including the shutdown control circuit in the above embodiments, where the load circuit may be a device powered by a battery, and the battery protection chip may perform reliable shutdown control on the device powered by the battery, which is beneficial to miniaturization of an electronic device.
A third aspect of the embodiments of the present application provides an electronic device, including the shutdown control circuit in the above embodiments.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (9)
1. The utility model provides a shutdown control circuit, includes the switch, switch and load circuit establish ties between the positive negative pole of power, its characterized in that, shutdown control circuit still includes:
the control circuit is used for receiving an external shutdown instruction, and outputting a shutdown driving signal according to the external shutdown instruction;
the driving circuit is connected to the control circuit and the switch and used for detecting whether the power supply is under-voltage or not and driving the switch to be switched off when the power supply is under-voltage and/or receiving the shutdown driving signal; and
a detection end of the shutdown detection circuit is connected to a connection node of the load circuit and the switch, an output end of the shutdown detection circuit is connected to the control circuit, and the shutdown detection circuit is used for continuously detecting the voltage at the connection node;
the shutdown detection circuit outputs a first shutdown logic signal to the control circuit when detecting that the voltage at the connection node is below a first preset voltage value, and the control circuit is further configured to keep outputting the shutdown driving signal according to the first shutdown logic signal until the voltage at the connection node is greater than the first preset voltage value;
the shutdown detection circuit is further configured to output a second shutdown logic signal indicating that the load circuit is completely powered down when detecting that the voltage at the connection node is greater than the first preset voltage value, and the control circuit is further configured to stop outputting the shutdown driving signal when receiving the second shutdown logic signal.
2. The shutdown control circuit of claim 1, wherein the output of the shutdown detection circuit is connected to an external device, and the second shutdown logic signal is further configured to control the external device to shutdown, where the external device includes the load circuit and/or a device other than the load circuit.
3. The shutdown control circuit of claim 2, wherein the external shutdown command is generated by the load circuit or the external device.
4. The shutdown control circuit of claim 1, wherein the shutdown control circuit further comprises a reset circuit;
the reset circuit is connected with the control circuit and is used for initializing the control circuit to a shutdown detection state when the load circuit is powered on; and
the reset circuit is further configured to initialize to a shutdown detection state after the control circuit receives the second shutdown logic signal.
5. The shutdown control circuit of claim 1, wherein the shutdown detection circuit comprises a hysteresis comparator, an input of the hysteresis comparator being connected to a connection node of the load circuit and the switch, an output of the hysteresis comparator being connected to the control circuit.
6. The shutdown control circuit of claim 1, wherein the drive circuit includes a detection circuit, a delay logic unit, a delay unit, and a drive unit;
the detection circuit is connected to the power supply and used for detecting the voltage of the power supply and outputting an undervoltage signal when the voltage of the power supply is lower than a second preset voltage;
the delay logic unit outputs a shutdown signal according to the undervoltage signal;
the delay unit is used for delaying the shutdown signal for a first preset time length and then outputting the shutdown signal;
the driving unit outputs a driving signal to the switch according to the shutdown signal.
7. The shutdown control circuit of claim 6, wherein the delay logic unit comprises a first NOR gate, a first NOT gate, a second NOR gate, and a second NOT gate;
a first input end of the first nor gate is used for receiving the undervoltage signal, a second input end of the first nor gate is connected with a first output end of the control circuit, an output end of the first nor gate is connected with an input end of the first nor gate, an output end of the first nor gate is connected with a first input end of the second nor gate, a second input end of the second nor gate is connected with a second output end of the control circuit, an output end of the second nor gate is connected with an input end of the second not gate, and an output end of the second not gate is connected with the delay unit;
the delay unit comprises a timer, a first NAND gate and a third NAND gate;
a first input end of the first nand gate is connected with the delay logic unit and the input end of the timer, an output end of the timer is connected with a second input end of the first nand gate, an output end of the first nand gate is connected with an input end of the third not gate, and an output end of the third not gate is connected with the driving unit;
the driving unit comprises a driver, an input end of the driver is used for receiving the shutdown signal, and an output end of the driver is connected with the switch and the control circuit.
8. A battery protection chip, further comprising the shutdown control circuit of any one of claims 1 to 7, wherein the load circuit is a device powered by a battery.
9. An electronic device, further comprising the shutdown control circuit of any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210026365.6A CN114039587B (en) | 2022-01-11 | 2022-01-11 | Shutdown control circuit, battery protection chip and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210026365.6A CN114039587B (en) | 2022-01-11 | 2022-01-11 | Shutdown control circuit, battery protection chip and electronic equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114039587A CN114039587A (en) | 2022-02-11 |
| CN114039587B true CN114039587B (en) | 2022-04-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210026365.6A Active CN114039587B (en) | 2022-01-11 | 2022-01-11 | Shutdown control circuit, battery protection chip and electronic equipment |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101856765A (en) * | 2009-04-07 | 2010-10-13 | 上海沪工电焊机制造有限公司 | Numerical control method of soft switch full-bridge phase shift welding power supply of electric welding machine |
| CN101951708A (en) * | 2009-07-10 | 2011-01-19 | 深圳比亚迪微电子有限公司 | Light modulating control circuit, chip and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5028825A (en) * | 1989-10-18 | 1991-07-02 | International Business Machines Corporation | Self-powered SCR gate drive circuit with optical isolation |
| CN101295933A (en) * | 2007-04-25 | 2008-10-29 | 中国科学院自动化研究所 | Frequency conversion power source based on digital signal processor controlling |
| DE102009030740A1 (en) * | 2009-06-26 | 2010-12-30 | Siemens Aktiengesellschaft | Commutation method of a converter phase with reverse conducting IGBTs |
| CN101964711B (en) * | 2010-09-20 | 2013-01-16 | 华为终端有限公司 | Power supply circuit and power supply chip of data card, and data card |
| CN207490595U (en) * | 2017-11-07 | 2018-06-12 | 广东美的生活电器制造有限公司 | Power-supplying circuit and electrical equipment |
| CN109532027A (en) * | 2018-12-26 | 2019-03-29 | 深圳市越疆科技有限公司 | 3D printer soft-off control circuit and 3D printing equipment |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101856765A (en) * | 2009-04-07 | 2010-10-13 | 上海沪工电焊机制造有限公司 | Numerical control method of soft switch full-bridge phase shift welding power supply of electric welding machine |
| CN101951708A (en) * | 2009-07-10 | 2011-01-19 | 深圳比亚迪微电子有限公司 | Light modulating control circuit, chip and method |
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| CN114039587A (en) | 2022-02-11 |
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