CN114678922A - Charging detection circuit and charging device - Google Patents

Charging detection circuit and charging device Download PDF

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Publication number
CN114678922A
CN114678922A CN202210243079.5A CN202210243079A CN114678922A CN 114678922 A CN114678922 A CN 114678922A CN 202210243079 A CN202210243079 A CN 202210243079A CN 114678922 A CN114678922 A CN 114678922A
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CN
China
Prior art keywords
charging
electrode
circuit
pnp
anode
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Pending
Application number
CN202210243079.5A
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Chinese (zh)
Inventor
王新为
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Shanghai Furnace Information Technology Co ltd
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Shanghai Furnace Information Technology Co ltd
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Publication date
Application filed by Shanghai Furnace Information Technology Co ltd filed Critical Shanghai Furnace Information Technology Co ltd
Priority to CN202210243079.5A priority Critical patent/CN114678922A/en
Publication of CN114678922A publication Critical patent/CN114678922A/en
Pending legal-status Critical Current

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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
    • H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • 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
    • H02J7/00304—Overcurrent protection
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a charging detection circuit and a charging device, comprising: the charging circuit comprises three charging pins and is used for charging a charger; the charging circuit is used for supplying power to a charged circuit and specifically comprises an insertion detection pin, a charging anode, a charging cathode, a detector DET, a PNP tube Q2 and a PMOS tube Q1; when the charging circuit is in a charging state, the insertion detection pin, the charging anode and the charging cathode are respectively connected with three charging pins of the charged circuit. A charging device comprises the charging detection circuit, wherein the insertion detection pin, the charging anode and the charging cathode protrude out of a plane where the bottom of a charging bin is located; the height of the charging positive electrode is higher than that of the insertion detection pin and that of the charging negative electrode. The invention provides a substitution scheme of a special chip, reduces the cost in the aspect of charging detection and improves the economic feasibility of products.

Description

Charging detection circuit and charging device
Technical Field
The present invention relates to the field of charging, and in particular, to a charging detection circuit and a charging device.
Background
The existing spring PIN wireless charging technology comprises 2PIN and 3PIN, most of charging insertion detection is realized by detecting charging current during charging, a special chip is needed, the price of the chip is increased due to the current supply chain problem, the cost of the special chip is high, and the existing engineering economy requirement cannot be met.
Disclosure of Invention
In order to solve the technical problems of higher cost and poorer engineering economy of a special chip in the prior art, the invention provides a charging detection circuit and a charging device, and the specific technical scheme is as follows:
a charge detection circuit, comprising:
the charged circuit comprises three charging pins and is used for charging a charged device;
the charging circuit is used for supplying power to the circuit to be charged and specifically comprises an insertion detection pin, a charging anode, a charging cathode, a detector DET, a PNP tube Q2 and a PMOS tube Q1; the detector DET is connected with a power supply anode VCC;
the base electrode of the PNP tube Q2 is connected with the detector DET, and the collector electrode of the PNP tube Q2 is connected with the negative pole GND of the power supply;
the grid electrode of the PMOS tube Q1 is connected with the emitter electrode of the PNP tube Q2, and the drain electrode of the PMOS tube Q1 is connected with a power supply anode VCC;
the base electrode of the PNP tube Q2 is connected with the insertion detection pin; the source electrode of the PMOS pipe Q1 is connected with the charging positive electrode; the charging negative electrode is connected with the power supply negative electrode GND;
when the charging circuit is in a charging state, the insertion detection pin, the charging anode and the charging cathode are respectively connected with three charging pins of the charged circuit.
According to the technical scheme, a replacement scheme of a special chip is provided through circuit design, the cost in the aspect of charging detection is reduced, and the economic feasibility of a product is improved.
Preferably, the positive electrode VCC of the power supply is connected with the base electrode of the PNP transistor Q2 through a second resistor;
the source electrode of the PMOS pipe Q1 is connected with the base electrode of the PNP pipe Q2 through the second resistor.
Further preferably, the emitter of the PNP transistor Q2 is also connected to the source of the PMOS transistor Q1 through a first resistor.
Further preferably, the resistance value of the first resistor is 10 kilo ohms; the resistance value of the second resistor is 10 kilo ohms.
Preferably, when only the charging anode is connected to the charging circuit, both the gate and the source of the PMOS transistor Q1 are at a high level.
Further preferably, when the insertion detection pin, the charging positive electrode and the charging negative electrode are all connected to the charging circuit, the emitter voltage of the PNP transistor Q2 is greater than the base voltage of the PNP transistor Q2, so that the PNP transistor Q2 is turned on; the gate voltage of the PMOS transistor Q1 is less than the source voltage of the PMOS transistor Q1, so that the PMOS transistor Q1 is turned on.
Preferably, the detector DET is further connected to an LED control circuit.
In the technical scheme, the LED control circuit is connected in series, so that the external part can be simply and effectively informed whether the charging equipment is inserted or not, and an extra MCU module is not needed, thereby further reducing the cost.
A charging device, a charging detection circuit, the insertion detection pin, the charging anode and the charging cathode protrude out of a plane where the bottom of a charging bin is located; the height of the charging positive electrode is higher than that of the insertion detection pin and that of the charging negative electrode.
Preferably, the insertion detection pin, the charging positive electrode, and the charging negative electrode are pogo pins.
Further preferably, the charging anode is located between the charging cathode and the insertion detection pin in the spatial layout.
In the technical scheme, the possibility of system short circuit is avoided and reduced by the design of a spatial arrangement mode among 3 spring pins and the matching of resistors, and the reliability of equipment is effectively improved.
The invention at least comprises the following technical effects:
(1) a substitution scheme of a special chip is provided, so that the cost in the aspect of charging detection is reduced, and the economic feasibility of the product is improved;
(2) by connecting the LED control circuit in series, the external device can be simply and effectively informed whether the equipment to be charged is inserted or not, and an additional MCU module is not needed, so that the cost is further reduced;
(3 through the design of the spatial arrangement mode among 3 spring pins, the possibility of system short circuit is avoided and reduced in cooperation with the resistance, and the reliability of the equipment is effectively improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, 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 schematic diagram of a charging circuit according to the present invention;
fig. 2 is a schematic view of a charging state according to the present invention.
Inserting a detection pin 1;
a charging positive electrode 2;
a charging negative electrode 3;
charging pin 4 charging pin 5, charging pin 6;
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
For the sake of simplicity, only the parts relevant to the present invention are schematically shown in the drawings, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically depicted, or only one of them is labeled. In this document, "one" means not only "only one" but also a case of "more than one".
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
In addition, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not intended to indicate or imply relative importance.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
Example 1:
as shown in fig. 1, the present embodiment provides a charge detection circuit, including:
the charging circuit comprises three charging pins and is used for charging a charger;
the charging circuit is used for supplying power to the circuit to be charged and specifically comprises an insertion detection pin 1, a charging anode 2, a charging cathode 3, a detector DET, a PNP tube Q2 and a PMOS tube Q1; the detector DET is connected with a power supply anode VCC;
the base electrode of the PNP tube Q2 is connected with the detector DET, and the collector electrode of the PNP tube Q2 is connected with the negative pole GND of the power supply;
the grid electrode of the PMOS tube Q1 is connected with the emitter electrode of the PNP tube Q2, and the drain electrode of the PMOS tube Q1 is connected with a power supply anode VCC;
the base electrode of the PNP tube Q2 is connected with the insertion detection pin 1; the source electrode of the PMOS pipe Q1 is connected with the charging positive electrode 2; the charging cathode 3 is connected with the power supply cathode GND;
when the charging circuit is in a charging state, the insertion detection pin 1, the charging anode 2 and the charging cathode 3 are respectively connected with three charging pins of the charged circuit. Generally, the insertion detection pin 1 corresponds to the charging pin 4, the charging anode 2 corresponds to the charging pin 5, and the charging cathode 3 corresponds to the charging pin 6.
The existing spring PIN wireless charging technology comprises 2PIN and 3PIN, most of charging insertion detection is realized by detecting charging current during charging, a special chip is needed, the price of the chip is increased due to the current supply chain problem, the cost of the special chip is high, and the existing engineering economy requirement cannot be met.
Therefore, in the embodiment, the detection circuit is used to replace the original proprietary chip. When the circuit to be charged is not connected to the charging circuit, since the gate and source of the PMOS transistor Q1 have the same level and the two electrodes B, E of the PNP transistor Q2 have the same level, neither the PMOS transistor Q1 nor the PNP transistor Q2 is turned on, and no loop is formed, so that in the charging circuit, only a loop from the power supply to the detector DET exists, and the detector DET detects a high level signal.
The embodiment provides a replacement scheme of a special chip through circuit design, reduces the cost in the aspect of charging detection, and improves the economic feasibility of products.
Preferably, when only the charging anode 2 is connected to the charging circuit, both the gate and the source of the PMOS transistor Q1 are at high level.
When only the charging anode 2 is connected to the charging circuit, since the gate and the source of the PMOS transistor Q1 have the same level, a corresponding loop cannot be formed, and charging cannot be performed.
Further preferably, when the insertion detection pin 1, the charging positive electrode 2 and the charging negative electrode 3 are all connected to the charging circuit, the emitter voltage of the PNP transistor Q2 is greater than the base voltage of the PNP transistor Q2, so that the PNP transistor Q2 is turned on; the gate voltage of the PMOS transistor Q1 is less than the source voltage of the PMOS transistor Q1, so that the PMOS transistor Q1 is turned on.
When the plug-in detection pin 1, the charging anode 2 and the charging cathode 3 are connected to a charging circuit at the same time, because the grid level of the PMOS tube Q1 at the moment is lower than the source level of the PMOS tube Q1, the PMOS tube Q1 is conducted, a loop from a power supply anode VCC to the charging anode 2, to a charged cathode 3 and to a power supply cathode GND is formed, and meanwhile, because the plug-in detection pin 1 is connected with the charging cathode 3, the emitter voltage of the PNP tube Q2 is larger than the base voltage of the PNP tube Q2, and a path from the power supply anode VCC to the plug-in detection pin 1 and to the power supply cathode GND is formed.
At this time, the detector DET is connected in parallel with a plurality of devices, so that the voltage drops and is in a low level state, and whether the devices are in a normal connection state can be easily judged by whether the detector DET is in a low level or a high level, and when the detector DET is in the normal connection state, the voltage of the power supply can be increased to enter a formal charging state.
Preferably, the detector DET is further connected to an LED control circuit. The LED control circuit is used for judging whether the charging equipment is to be inserted or not by the on-off of the LED lamp, and the LED lamp is used as an indication, so that the MCU module can be omitted.
Through series connection of the LED control circuit, the external can be simply and effectively informed whether the equipment to be charged is inserted or not, and an additional MCU module is not needed, so that the cost is further reduced.
Preferably, the positive electrode VCC of the power supply is connected with the base electrode of the PNP tube Q2 through a second resistor; the source electrode of the PMOS pipe Q1 is connected with the base electrode of the PNP pipe Q2 through the second resistor.
If only the detection pin 1 is inserted and the charging anode 2 is short-circuited, the short-circuit detection pin cannot form an electric loop; when the charging cathode 3 and the charging anode 2 are short-circuited, the charging anode 2 is often not output and is not short-circuited; only when the detection pin 1 and the charging cathode 3 are inserted, the second resistor is connected in series, so that the short circuit cannot affect the detection pin; the resistance value of the second resistor is 10 kilo ohms.
This embodiment is through the setting of second resistance, and the effectual metal foreign matter of having avoided when getting into the storehouse that charges, the circuit board damage that the short circuit caused between the pogo pin.
Preferably, the emitter of the PNP transistor Q2 is further connected to the source of the PMOS transistor Q1 through a first resistor; the resistance value of the first resistor is 10 kilo ohms;
through setting up first resistance, avoid when PNP pipe Q2 switches on, positive VCC of power and power negative pole GND lug connection to lead to further short circuit.
Example 2:
as shown in fig. 2, the present embodiment provides a charging device, including the charging detection circuit of embodiment 1, wherein the insertion detection pin 1, the charging positive electrode 2, and the charging negative electrode 3 protrude from a plane where the bottom of the charging chamber is located; the height of the charging anode 2 is higher than that of the insertion detection pin 1 and the charging cathode 3. The insertion detection pin 1, the charging anode 2 and the charging cathode 3 are spring pins. The charging anode 2 is positioned between the charging cathode 3 and the insertion detection pin 1 in the spatial layout.
When the device to be charged is inserted into the charging chamber, the device to be charged is firstly contacted with the charging anode 2, and at the moment, because the two electrodes G, S of the PMOS transistor Q1 are both at high level, the charging anode 2 cannot output voltage. When the charging device continues to contact the insertion detection pin 1 and the charging negative electrode 3 at the bottom downwards, the insertion detection pin 1 and the charging negative electrode 3 can be electrically connected, so that the insertion detection pin 1 is grounded. Then, because the voltage of the emitter is greater than the voltage of the base electrode, the PNP transistor Q2 is turned on, so that the gate level is less than the source level to enter a conducting state, and the charging anode 2 outputs an external voltage to charge the device to be charged.
When the storehouse of charging had the foreign matter to enter into, because 3 spring pins become certain interval and arrange and the characteristics that high both sides are low in the middle of, hardly cause 3 spring pins short circuit simultaneously, and have and only when 3 spring pins short circuit simultaneously, charging circuit just can the short circuit.
In the embodiment, through the design of the spatial arrangement mode among 3 spring pins, the possibility of system short circuit is avoided and reduced, and the reliability of the equipment is effectively improved.
Through the embodiment, the invention realizes that:
(1) a special chip substitution scheme is provided, the cost in the aspect of charging detection is reduced, and the economic feasibility of the product is improved;
(2) by connecting the LED control circuit in series, the external device can be simply and effectively informed whether the device to be charged is inserted or not, and an additional MCU module is not needed, so that the cost is further reduced;
(3 through the design of the spatial arrangement mode among 3 spring pins, the possibility of system short circuit is avoided and reduced in cooperation with the resistance, and the reliability of the equipment is effectively improved.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. A charge detection circuit, comprising:
the charging circuit comprises three charging pins and is used for charging a charger;
the charging circuit is used for supplying power to the circuit to be charged and specifically comprises an insertion detection pin, a charging anode, a charging cathode, a detector DET, a PNP tube Q2 and a PMOS tube Q1; the detector DET is connected with a power supply anode VCC;
the base electrode of the PNP tube Q2 is connected with the detector DET, and the collector electrode of the PNP tube Q2 is connected with the negative pole GND of the power supply;
the grid electrode of the PMOS tube Q1 is connected with the emitter electrode of the PNP tube Q2, and the drain electrode of the PMOS tube Q1 is connected with a power supply anode VCC;
the base electrode of the PNP tube Q2 is connected with the insertion detection pin; the source electrode of the PMOS pipe Q1 is connected with the charging positive electrode; the charging negative electrode is connected with the power supply negative electrode GND;
when the charging circuit is in a charging state, the insertion detection pin, the charging anode and the charging cathode are respectively connected with three charging pins of the charged circuit.
2. The charge detection circuit according to claim 1, wherein the positive power supply electrode VCC is connected to the base electrode of the PNP transistor Q2 through a second resistor;
the source electrode of the PMOS pipe Q1 is connected with the base electrode of the PNP pipe Q2 through the second resistor.
3. The charge detection circuit of claim 2, wherein the emitter of the PNP transistor Q2 is further connected to the source of the PMOS transistor Q1 through a first resistor.
4. A charge detection circuit as claimed in claim 3, wherein the first resistor has a resistance of 10 kilo ohms;
the resistance value of the second resistor is 10 kilo ohms.
5. The charge detection circuit of claim 1, wherein when only the charging anode is connected to the charging circuit, the gate and the source of the PMOS transistor Q1 are both high.
6. The charge detection circuit according to claim 1 or 5, wherein when the insertion detection pin, the positive charge electrode and the negative charge electrode are all connected to the charge circuit, the emitter voltage of the PNP transistor Q2 is greater than the base voltage of the PNP transistor Q2, so that the PNP transistor Q2 is turned on; the gate voltage of the PMOS transistor Q1 is less than the source voltage of the PMOS transistor Q1, so that the PMOS transistor Q1 is turned on.
7. The charge detection circuit according to claim 1, wherein the detector DET is further connected to an LED control circuit.
8. A charging device comprising a charging detection circuit as claimed in any one of claims 1 to 7, wherein the insertion detection pin, the charging positive electrode and the charging negative electrode protrude from a plane in which the bottom of the charging chamber is located; the height of the charging anode is higher than that of the insertion detection pin and the charging cathode.
9. A charging arrangement as claimed in claim 8, in which the insertion detection pin, the charging positive electrode and the charging negative electrode are pogo pins.
10. A charging arrangement as claimed in claim 9, in which the positive charging electrode is spatially disposed between the negative charging electrode and the insertion detection pin.
CN202210243079.5A 2022-03-11 2022-03-11 Charging detection circuit and charging device Pending CN114678922A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210243079.5A CN114678922A (en) 2022-03-11 2022-03-11 Charging detection circuit and charging device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210243079.5A CN114678922A (en) 2022-03-11 2022-03-11 Charging detection circuit and charging device

Publications (1)

Publication Number Publication Date
CN114678922A true CN114678922A (en) 2022-06-28

Family

ID=82074428

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210243079.5A Pending CN114678922A (en) 2022-03-11 2022-03-11 Charging detection circuit and charging device

Country Status (1)

Country Link
CN (1) CN114678922A (en)

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