CN212304777U - Single-circuit battery discharge circuit - Google Patents
Single-circuit battery discharge circuit Download PDFInfo
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- CN212304777U CN212304777U CN202020504075.4U CN202020504075U CN212304777U CN 212304777 U CN212304777 U CN 212304777U CN 202020504075 U CN202020504075 U CN 202020504075U CN 212304777 U CN212304777 U CN 212304777U
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Abstract
The utility model provides a single circuit battery discharge circuit, it includes first P-MOS module, the drain electrode and the voltage input end of first P-MOS module are connected, still include second P-MOS or second P-MOS module, the grid and the voltage input end of second P-MOS or second P-MOS module are connected, and the source electrode is connected with voltage output end, and the drain electrode is connected with the battery positive pole. The utility model discloses single circuit battery discharge circuit improves the charge-discharge circuit among the common single circuit battery management system, has increased a new route of discharging, controls opening and closing of the new route of discharging through the change of the first P-MOS module pin level that exists among the former charge-discharge circuit, because the electron device on the new route of discharging can allow the heavy current to flow through, consequently it can provide heavy current output, satisfies the high-power demand of load end.
Description
Technical Field
The utility model relates to the field of electronic technology, concretely relates to one-way battery discharge circuit.
Background
The battery is charged when the electronic product is connected with an external power supply, and the battery provides electric energy required by the work of the electronic product when the electronic product is disconnected with the external power supply. In the case where the battery supplies electric energy required for the operation of the electronic product, the battery is required to be able to provide a stable voltage output, or the battery is required to be able to provide a current output in accordance with a required magnitude.
The chinese patent application No. 201711186630.2 provides a battery charging and discharging circuit, which includes a first switch tube M1, a second switch S2, a third switch S3 and a power stage circuit. One end of the third switch S3 is connected to a high potential end of an input voltage, the other end of the third switch S3 is connected to a first input end of the power stage circuit, a second input end of the power stage circuit is connected to a low potential end of the input voltage, a first output end of the power stage circuit is connected to one end of the first switch tube M1, the other end of the first switch tube M1 is connected to a positive electrode of a battery pack, a negative electrode of the battery pack is connected to a second output end of the power stage circuit, the load is connected to an output end of the power stage circuit, one end of the second switch S2 is connected to a common end of the first switch tube M1 and the battery pack, and the other end of the second switch S2 is connected to the first input end of the power stage circuit. The first input end of the power level circuit is an input high potential end of the power level circuit, the second input end of the power level circuit is an input low potential end of the power level circuit, the first output end of the power level circuit is an output high potential end of the power level circuit, the second output end of the power level circuit is an output low potential end of the power level circuit, and the second input end and the second output end of the power level circuit are the same end. The power stage circuit is a Boost circuit and comprises an energy storage inductor, a second switching tube M2 and a third switching tube M3, the drain electrode of the second switching tube is the first output end of the power stage circuit, the source electrode of the first switching tube is connected with the drain electrode of the third switching tube, the source electrode of the third switching tube is the second output end and the second input end of the power stage circuit, one end of the energy storage inductor is connected with the common end of the first switching tube and the second switch, and the other end of the energy storage inductor is used as the first output end of the power stage circuit. The battery charging and discharging circuit can complete the charging and discharging process of the battery under the two conditions of load disconnection and no disconnection, and can ensure the voltage stability at two ends of the load in the charging and discharging process of the battery under the two conditions.
The charging and discharging of a conventional one-way battery management system is the same path. Fig. 1 is a schematic diagram of a charging/discharging circuit in a conventional one-way battery management system. The charging and discharging circuit is provided with three MOSFETs, a sampling resistor and an inductor, and the three MOSFETs and a diode are integrated to form an MOS module. When the circuit is used for charging a battery, charging current firstly flows through a first MOS module marked as Q1A in the figure, then flows through a second MOS module marked as TGATE in the figure or a third MOS module connected with a drain electrode of the TGATE, and finally flows through an inductor and a sampling resistor to charge the battery. When the battery discharges, the current output by the battery flows through the sampling resistor, the inductor and the TGATE, and the electric energy is output to the voltage output end. When the voltage output end needs to output small current, the discharging circuit has no problem, but when the voltage output end needs to output large current, on one hand, due to the damping effect of the inductor, the discharging circuit has poor transient response, the voltage output end cannot instantaneously output the required large current, and the power failure condition occurs; on the other hand, due to the existence of the sampling resistor, when a large current flows, the circuit may enter a protection state, and the required large current cannot be output.
SUMMERY OF THE UTILITY MODEL
According to the shortcoming and the deficiency of the prior art, the utility model discloses one of the problem that solves is to improve the one way battery charge-discharge circuit that charges and discharges for same route, makes it provide heavy current output.
For better explanation of the technical solution of the present invention, the following convention is first made for technical terms:
MOSFET: an insulated gate field effect transistor;
P-MOS: p channel insulated gate field effect transistor;
a P-MOS module: an electronic device is formed by integrating a P-MOS and a diode.
The utility model adopts the technical proposal that: a single-circuit battery discharge circuit comprises a first P-MOS module and a second P-MOS module, wherein the drain electrode of the first P-MOS module is connected with a voltage input end, the grid electrode of the second P-MOS module is connected with the voltage input end, the source electrode of the second P-MOS module is connected with a voltage output end, and the drain electrode of the second P-MOS module is connected with the anode of a battery.
Preferably, the second P-MOS is an enhancement P-MOS.
In any of the above schemes, preferably, a zener diode is connected between the second P-MOS gate and the voltage output terminal.
In any of the above schemes, preferably, the zener diode is a unidirectional zener diode, an anode of the unidirectional zener diode is connected to the gate of the second P-MOS, and a cathode of the unidirectional zener diode is connected to the voltage output terminal.
In any of the above embodiments, preferably, the rated voltage of the zener diode is lower than VGS of the second P-MOS and higher than the voltage of the positive electrode of the battery.
In any of the above embodiments, preferably, a resistor is connected between the gate of the second P-MOS and the voltage input terminal.
In any of the above schemes, preferably, a schottky diode is connected in parallel to the second P-MOS, an anode of the schottky diode is connected to a gate of the second P-MOS, and a cathode of the schottky diode is connected to a source of the second P-MOS.
In any of the above schemes, preferably, the change of the pin level of the first P-MOS module controls the turning on and off of the second P-MOS.
The utility model discloses an another technical scheme replace for adopting the P-MOS module second P-MOS, a one way battery discharge circuit promptly, including first P-MOS module, the drain electrode and the voltage input end of first P-MOS module are connected, still include second P-MOS module, the grid and the voltage input end of second P-MOS module are connected, and the source electrode is connected with voltage output end, and the drain electrode is connected with the battery positive pole.
Preferably, a voltage stabilizing diode is connected between the gate of the second P-MOS module and the voltage output terminal.
In any of the above schemes, preferably, the zener diode is a unidirectional zener diode, an anode of the unidirectional zener diode is connected to the gate of the second P-MOS module, and a cathode of the unidirectional zener diode is connected to the voltage output terminal.
In any of the above embodiments, preferably, the rated voltage of the zener diode is lower than VGS of the second P-MOS module and higher than the voltage of the positive electrode of the battery.
In any of the above schemes, preferably, a resistor is connected between the gate of the second P-MOS module and the voltage input terminal.
In any of the above schemes, preferably, a schottky diode is connected in parallel to the second P-MOS module, an anode of the schottky diode is connected to a gate of the second P-MOS, and a cathode of the schottky diode is connected to a source of the second P-MOS.
In any of the above schemes, preferably, the change of the pin level of the first P-MOS module controls the turning on and off of the second P-MOS module.
The utility model discloses a single circuit battery discharge circuit improves the charge-discharge circuit among the single circuit battery management system commonly used, a new route of discharging has been increased, the new opening and closing of route of discharging of change control through the first P-MOS module pin level that exists among the former charge-discharge circuit, because the electron device on the new route of discharging can allow the heavy current to flow through, and transient response is good, therefore it can provide heavy current output, satisfy the high-power demand of load end, and the condition of falling the electricity can not appear in voltage output end.
Drawings
Fig. 1 is a schematic diagram of a charging/discharging circuit in a conventional one-way battery management system.
Fig. 2 is a circuit schematic diagram of a preferred embodiment of the improvement of the circuit shown in fig. 1 by the single-circuit battery discharge circuit according to the present invention.
Fig. 3 is a circuit schematic diagram of another embodiment of a single-pass battery discharge circuit according to the present invention to improve the circuit shown in fig. 1.
Fig. 4 is a schematic diagram of the internal structure and pins of a preferred embodiment of a P-MOS module used in the single-circuit battery discharging circuit of the present invention.
Fig. 5 is a partial circuit diagram of a one-way battery management system employed in an electronic product.
Fig. 6 is a schematic circuit diagram of a preferred embodiment of the single-circuit battery discharging circuit according to the present invention, which is an improvement of the discharging circuit of the single-circuit battery management system shown in fig. 5.
Detailed Description
For a better understanding of the present invention, reference will now be made in detail to the present invention with reference to the following examples. "connected" in the following description includes direct connection and indirect connection through other components, including electrical connection through wires, and also includes connection through connectors or connection through solder joints, and also includes other connection means for bringing two components into relationship.
Example 1
As shown in fig. 1, in a charging and discharging circuit in a conventional one-way battery management system, the charging and discharging of the battery are performed in the same path. The charging and discharging circuit is provided with three MOSFETs, a sampling resistor and an inductor, and the three MOSFETs and a diode are integrated to form an MOS module. During charging, a charging current firstly flows through the first P-MOS module marked as Q1A in fig. 1, then flows through the MOS module marked as TGATE in the figure or the MOS module connected with the drain of the TGATE, and finally flows through the inductor and the sampling resistor to charge the battery. During discharging, the current output by the battery flows through the sampling resistor, the inductor and the TGATE, and electric energy is output to the voltage output end. In the figure, Q1A represents a first P-MOS module, the drain of which is connected with the voltage input terminal, TGATE represents a high-end driving P-MOS module of a charging switch tube, INDUCTOR represents an INDUCTOR, and R representsSENSEAnd the voltage of a sampling inductor is represented, VIN represents the voltage of a voltage input end, VOUT represents the voltage of a voltage output end, and VBAT represents the voltage of a battery anode.
As shown in fig. 2, the charging and discharging circuit of fig. 1 is modified, and a new discharging path is added to the circuit of fig. 1, and the discharging path includes a second P-MOS, the gate of the second P-MOS is connected to the voltage input terminal, the source of the second P-MOS is connected to the voltage output terminal, and the drain of the second P-MOS is connected to the positive electrode of the battery. The second P-MOS is an enhancement P-MOS.
In the charging and discharging process, the level of the pin Q1A of the first P-MOS module controls the on and off of the second P-MOS. In the process of charging the battery, VIN is greater than VBAT, at this time, the gate-source voltage VGS of the second P-MOS is 0, the second P-MOS is in an off state, Q1A is in an on state, and the charging current passes through the first P-MOS module Q1A, TGATE, the inductor and the sampling resistor to charge the battery. And after the charging power supply is disconnected, VIN is smaller than VBAT, the second P-MOS is conducted, the resistance of the second P-MOS during conduction is far smaller than that of the original discharging path, so that discharging current can directly reach a voltage output end from the second P-MOS, and meanwhile, the second P-MOS of an electronic device on a new discharging path can bear the flowing of large current, so that the new discharging path can provide large-current output, and the requirement of high power of a load is met.
Example 2
As shown in fig. 3, unlike the previous embodiment, the second P-MOS is replaced by a second P-MOS module, which is indicated by Q1B in fig. 3, and an existing electronic device, such as FDMC2523P, can be used, and the internal structure and pins are shown in fig. 4, wherein pins 1, 2, and 3 are the sources of the P-MOS modules, pin 4 is the gate of the P-MOS module, pins 5, 6, 7, and 8 are the drains of the P-MOS modules, the anodes of the diodes are connected to the drains of the P-MOS modules, and the cathodes of the diodes are connected to the sources of the P-MOS modules, and the second P-MOS module can effectively prevent the backflow and can provide power to the load more rapidly after the charging power supply is disconnected. And the grid electrode of the second P-MOS module is connected with the voltage input end, the source electrode of the second P-MOS module is connected with the voltage output end, and the drain electrode of the second P-MOS module is connected with the anode of the battery. During charging and discharging, the level change of the pin Q1A of the first P-MOS module controls the Q1B to be switched on and off. When the charging power supply is disconnected, the diode in the Q1B is instantaneously conducted, the battery current flows through the diode to the load end, then the P-MOS in the Q1B is conducted, and the diode in the Q1B is short-circuited, so that the diode is instantaneously conducted to rapidly provide power supply for the load after the charging power supply is disconnected, and the situation that the Q1B generates heat seriously due to long-time operation of the diode is avoided.
Meanwhile, in order to avoid that a voltage input end suddenly has large voltage to rush in the discharging process of the battery and damage a charging and discharging circuit, a voltage stabilizing diode and a resistor are further arranged on a new discharging path, the voltage stabilizing diode is a one-way voltage stabilizing diode, the anode of the voltage stabilizing diode is connected with the grid electrode of the second P-MOS module, the cathode of the voltage stabilizing diode is connected with the voltage output end, and the rated voltage of the voltage stabilizing diode is lower than VGS of Q1B and higher than the voltage of the positive electrode of the battery. The resistor is disposed between the gate of the Q1B and the voltage input.
In this embodiment, the voltage withstanding value of the zener diode is 18V, and the resistance value of the resistor is 100 k.
Example 3
Unlike the embodiment 1, in a manner similar to that of the embodiment 2, in order to avoid damage to the charging and discharging circuit caused by sudden large voltage inrush at the voltage input terminal during the discharging process of the battery, a zener diode and a resistor are further disposed on the new discharging path, the zener diode is a unidirectional zener diode, the anode of the zener diode is connected to the gate of the P-MOS, the cathode of the zener diode is connected to the voltage output terminal, and the rated voltage of the zener diode is lower than VGS of the P-MOS and higher than the voltage of the positive electrode of the battery. The resistor is arranged between the grid electrode of the P-MOS and the voltage input end.
Example 4
In order to prevent the P-MOS or the second P-MOS block Q1B from being turned on rapidly to supply power to the load if the voltage input terminal is powered down very slowly, a schottky diode is connected in parallel to the P-MOS or the second P-MOS block Q1B, an anode of the schottky diode is connected to a gate of the second P-MOS, and a cathode of the schottky diode is connected to a source of the second P-MOS.
Example 5
As shown in fig. 5, a partial circuit diagram of a one-way battery management system for an electronic product is shown, in the one-way battery management system, the type of the manager is LTC4006EGN-4, and the types of the Q1A module and the TGATE module are Si4431DY-T1, wherein the gate of the Q1A module is connected to the nfet pin of the manager, the source thereof is connected to the voltage input terminal and the VIN pin of the manager, and the drain thereof is connected to the voltage output terminal and the CLP pin of the manager; and the gate of the TGATE module is connected with a BATFET pin of the manager, the source of the TGATE module is connected with the anode of the battery, and the drain of the TGATE module is connected with a power output end. In this one-way battery management system, the charging and discharging paths of the battery are the same path, and there is also a problem that a large current cannot be supplied.
As shown in fig. 6, the discharging circuit of the one-way battery management system shown in fig. 5 is modified by adding a second P-MOS module Q1B, a zener diode and a resistor, wherein the second P-MOS module Q1B is of type Si4431DY-T1, the drain thereof is connected to the positive electrode of the battery, the source thereof is connected to the voltage output terminal, the gate thereof is connected to the voltage input terminal, the zener diode is of type MBRM140T3G, the anode thereof is connected to the gate of the second P-MOS module Q1B, the cathode thereof is connected to the source of the second P-MOS module Q1B, and the resistor is disposed between the gate of the second P-MOS module Q1B and the voltage input terminal, and the resistance thereof is 100K. After improvement, when the battery discharges, current reaches the voltage output end from the battery through the second P-MOS module Q1B, because the second P-MOS module Q1B can bear the flow of large current, the high-power requirement of the load can be met, and the voltage stabilizing diode and the resistor are arranged, the device for the circuit can be prevented from being damaged by sudden surge of large voltage.
It should be noted that the technical solutions of the present application all relate to improvements in hardware, and do not relate to improvements in software; for each part without the indicated model, the part can be selected from common parts in the prior art and is not limited by the model; the components of the embodiments are indicated by the models, which are only used for describing the technical scheme of the application in detail, and it should be understood that the technical scheme to be protected by the invention is not limited by the models, and the prior art has many alternatives for replacing the components.
The above embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the foregoing embodiments illustrate the present invention in detail, those skilled in the art will appreciate that: it is possible to modify the solutions described in the foregoing embodiments or to substitute some or all of the technical features thereof, without departing from the scope of the present invention.
Claims (10)
1. A single-circuit battery discharge circuit comprises a first P-MOS module, wherein the drain electrode of the first P-MOS module is connected with a voltage input end, and the single-circuit battery discharge circuit is characterized in that: the battery further comprises a second P-MOS, wherein the grid electrode of the second P-MOS is connected with the voltage input end, the source electrode of the second P-MOS is connected with the voltage output end, the drain electrode of the second P-MOS is connected with the anode of the battery, and the P-MOS module is an electronic device formed by integrating a P-MOS and a diode.
2. The single-cell discharge circuit of claim 1, wherein: and a voltage stabilizing diode is connected between the second P-MOS grid and the voltage output end.
3. The single-cell discharge circuit of claim 2, wherein: the voltage stabilizing diode is a one-way voltage stabilizing diode, the anode of the voltage stabilizing diode is connected with the grid electrode of the second P-MOS, and the cathode of the voltage stabilizing diode is connected with the voltage output end.
4. The single-cell discharge circuit of claim 1, wherein: and a resistor is connected between the grid of the second P-MOS and the voltage input end.
5. The single-cell discharge circuit of claim 1, wherein: and a Schottky diode is connected in parallel at the second P-MOS, the anode of the Schottky diode is connected with the grid electrode of the second P-MOS, and the cathode of the Schottky diode is connected with the source electrode of the second P-MOS.
6. A single-circuit battery discharge circuit comprises a first P-MOS module, wherein the drain electrode of the first P-MOS module is connected with a voltage input end, the single-circuit battery discharge circuit is characterized by further comprising a second P-MOS module, the grid electrode of the second P-MOS module is connected with the voltage input end, the source electrode of the second P-MOS module is connected with a voltage output end, the drain electrode of the second P-MOS module is connected with the anode of a battery, and the P-MOS module is an electronic device formed by integrating a P-MOS and a diode.
7. The single-cell discharge circuit of claim 6, wherein: and a voltage stabilizing diode is connected between the grid of the second P-MOS module and the voltage output end.
8. The single-cell discharge circuit of claim 7, wherein: the voltage stabilizing diode is a one-way voltage stabilizing diode, the anode of the voltage stabilizing diode is connected with the grid electrode of the second P-MOS module, and the cathode of the voltage stabilizing diode is connected with the voltage output end.
9. The single-cell discharge circuit of claim 6, wherein: and a resistor is connected between the grid of the second P-MOS module and the voltage input end.
10. The single-cell discharge circuit of claim 6, wherein: and a Schottky diode is connected in parallel at the second P-MOS module, the anode of the Schottky diode is connected with the grid electrode of the second P-MOS, and the cathode of the Schottky diode is connected with the source electrode of the second P-MOS.
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| CN202020504075.4U CN212304777U (en) | 2020-04-09 | 2020-04-09 | Single-circuit battery discharge circuit |
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| CN202020504075.4U CN212304777U (en) | 2020-04-09 | 2020-04-09 | Single-circuit battery discharge circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116760396A (en) * | 2023-07-28 | 2023-09-15 | 武汉景捷半导体有限公司 | Control circuit, method and system of bat and readable storage medium |
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2020
- 2020-04-09 CN CN202020504075.4U patent/CN212304777U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116760396A (en) * | 2023-07-28 | 2023-09-15 | 武汉景捷半导体有限公司 | Control circuit, method and system of bat and readable storage medium |
| CN116760396B (en) * | 2023-07-28 | 2024-01-26 | 武汉景捷半导体有限公司 | Control circuit, method and system of bat and readable storage medium |
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