Charger two-way identification circuit and charger two-way identification device

Abstract

The utility model provides a charger bidirectional identification circuit and a charger bidirectional identification device.The circuit comprises a control circuit, an activation driving circuit and a power connection identification circuit, the power connection end of the control circuit is used for being connected with a reference power supply, and the power receiving end of the activation driving circuit is connected with the output end of the control circuit; a signal activation end of the activation driving circuit is used for connecting a battery, a grounding end of the activation driving circuit is grounded, and the power connection identification circuit comprises a first resistor and a bidirectional diode. According to the charger bidirectional identification circuit, the charging identification signal enabling end of the charger is connected into the circuit, then the driving circuit is switched on, a battery is activated, and meanwhile a charging identification signal is transmitted to the control unit, so that charging identification detection is achieved; if a common charger is connected, due to the fact that the charger is not provided with a charging identification signal end, the activation driving circuit cannot be driven to be opened, a battery charging loop cannot be activated for charging, power supply current outputs high level to the control unit after passing through the control circuit and the first resistor, and therefore the safety performance is good.

Description

Technical Field

[0001] The present disclosure relates to the technical field of chargers, and in particular to a charger bidirectional identification circuit and a charger bidirectional identification device. Background Art

[0002] In recent years, the share of lithium batteries in the electric vehicle market has been increasing, which has also attracted many manufacturers to enter this market, making charger specifications and battery models more complicated.

[0003] At present, traditional chargers only have two output ports: the positive charging port and the negative charging port. In addition, the charging current is a constant output in the constant current stage. As long as the specifications are similar, many different types of batteries can be charged. In this way, the voltage of the battery and the charger are not matched. At this time, chargers with different applicable voltages charge batteries with incompatible applicable voltages, which may cause problems such as slow charging, overcharging, heating, and even fire or explosion. This poses a safety risk to battery charging.

[0004] Therefore, it is extremely important to design a circuit that supports charging identification detection between the charger and the battery and can effectively ensure the safety of battery charging. Utility Model Content

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a charger bidirectional identification circuit and a charger bidirectional identification device with effective charging identification and good safety performance.

[0006] The purpose of this disclosure is achieved through the following technical solutions:

[0007] A charger bidirectional identification circuit, comprising:

[0008] A control circuit, wherein the power terminal of the control circuit is used to connect to a reference power supply;

[0009] an activation drive circuit, wherein a power receiving end of the activation drive circuit is connected to an output end of the control circuit, a signal activation end of the activation drive circuit is used to connect to a battery, and a ground end of the activation drive circuit is grounded;

[0010] The power-on identification circuit includes a first resistor and a bidirectional diode, wherein the first end of the first resistor is respectively connected to the output two ends of the control circuit and the first end of the bidirectional diode, the second end of the first resistor is used to connect to the control end of the control unit, the first end of the bidirectional diode is also used to connect to the charging identification signal enable end of the charger, and the second end of the bidirectional diode is grounded.

[0011] In one embodiment, the power-on identification circuit further includes a fuse, a first end of the fuse is connected to a first end of the bidirectional diode, and a second end of the fuse is used to connect to a charging identification signal enable end of a charger.

[0012] In one embodiment, the power-on identification circuit further includes a universal diode, an anode of the universal diode is connected to the first end of the first resistor, and a cathode of the universal diode is connected to the first end of the fuse.

[0013] In one embodiment, the control circuit includes a first transistor and a second resistor, the first end of the second resistor is connected to a reference power supply, the second end of the second resistor is respectively connected to the first end of the first resistor and the control end of the first transistor, the first end of the first transistor is connected to the first end of the second resistor, and the second end of the first transistor is connected to the power receiving end of the activation drive circuit.

[0014] In one embodiment, the control circuit further includes a third resistor, and the second end of the second resistor is connected to the first end of the first resistor through the third resistor.

[0015] In one embodiment, the control circuit further includes a filter capacitor, an upper half of the filter capacitor is connected to the first end of the second resistor, and a lower half of the filter capacitor is connected to the second end of the second resistor.

[0016] In one embodiment, the activation drive circuit includes a fourth resistor and a second transistor, the first end of the fourth resistor is connected to an output end of the control circuit, the second end of the fourth resistor is connected to the control end of the second transistor, the first end of the second transistor is used to connect to the charging activation signal enable end of the battery, and the second end of the second transistor is grounded.

[0017] In one embodiment, the activation driving circuit further includes a fifth resistor, a first end of the fifth resistor is connected to the second end of the fourth resistor, and a second end of the fifth resistor is connected to the second end of the second transistor.

[0018] In one embodiment, at least one of the fourth resistor and the fifth resistor is a variable resistor.

[0019] A charger bidirectional identification device comprises the charger bidirectional identification circuit described in any one of the above embodiments.

[0020] Compared with the prior art, the present invention has at least the following advantages:

[0021] The charger bidirectional identification circuit utilizes the charging identification signal enable terminal of the charger. After being connected to the circuit, the driving circuit is turned on. While activating the battery, the charging identification signal is also transmitted to the IO terminal of the control unit MCU through the control terminal of the control unit to realize charging identification detection. If a general charger is connected, since it does not have a charging identification signal terminal, the activation driving circuit will not be driven to open at this time, and the battery charging circuit cannot be activated for charging. The power current outputs a high level to the control unit after passing through the control circuit and the first resistor, so that the safety performance of the charger bidirectional identification circuit is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 FIG. 4 is a circuit diagram of a charger bidirectional identification circuit in an embodiment.

[0024] Figure numerals: 10, charger bidirectional identification circuit; 100, control circuit; 200, activation drive circuit; 300, power-on identification circuit; RK6, first resistor; RK1, second resistor; RK3, third resistor; RK8, fourth resistor; RK10, fifth resistor; CK6, filter capacitor; QK2, first transistor; QK7, second transistor; DK1, general diode; ZK1, bidirectional diode; FK1, fuse; CHG_ATV, charging activation signal; CHG_SW, charging identification signal. DETAILED DESCRIPTION

[0025] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0028] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:

[0029] See also Figure 1 , which is a charger bidirectional identification circuit 10 according to an embodiment of the present invention, including a control circuit 100 , an activation drive circuit 200 and a power-on identification circuit 300 .

[0030] The power connection terminal of the control circuit 100 is used to connect to the reference power supply. In this embodiment, the control circuit 100 includes a first transistor QK2 and a second resistor RK1, a first terminal of the second resistor RK1 is connected to the reference power supply, a second terminal of the second resistor RK1 is respectively connected to a first terminal of the first resistor RK6 and a control terminal of the first transistor QK2, and a first terminal of the first transistor QK2 is connected to a first terminal of the second resistor RK1.

[0031] The power receiving terminal of the activation driving circuit 200 is connected to the output end of the control circuit 100, the signal activation end of the activation driving circuit 200 is used to connect the battery, and the ground end of the activation driving circuit 200 is grounded. In this embodiment, the activation driving circuit 200 includes a fourth resistor RK8 and a second transistor QK7, the first end of the fourth resistor RK8 is connected to the output end of the control circuit 100, that is, the second end of the first transistor QK2, the second end of the fourth resistor RK8 is connected to the control end of the second transistor QK7, the first end of the second transistor QK7 is used to connect the charging activation signal enable end of the battery, and the second end of the second transistor QK7 is grounded. Specifically, the first end of the second transistor QK7 is used to connect the battery through the charging activation signal enable end, so that when the first transistor QK2 is turned on, the level of the charging activation signal enable end is pulled down to activate the battery charging.

[0032] The power-on identification circuit 300 includes a first resistor RK6 and a bidirectional diode ZK1. The first end of the first resistor RK6 is connected to the output terminals of the control circuit 100 and the first end of the bidirectional diode ZK1 respectively. The second end of the first resistor RK6 is used to connect to the control terminal of the control unit, that is, connected to the control terminal of the control unit through the switch terminal SW_ON. The first end of the bidirectional diode ZK1 is also used to connect to the charging identification signal enable terminal of the charger, and the second end of the bidirectional diode ZK1 is grounded. Specifically, the charging identification signal enable terminal is used for the charger to send the charging identification signal CHG_SW to the control unit, and the control end of the control unit is used to receive the charging identification signal CHG_SW, and determine whether to charge the battery according to the signal level state.

[0033] In this embodiment, the charger bidirectional identification circuit 10 uses the charging identification signal enable terminal of the charger, and after being connected to the circuit, the driving circuit is turned on, and while activating the battery, the charging identification signal CHG_SW is transmitted to the IO terminal of the control unit MCU through the control terminal of the control unit to realize charging identification detection; if a general charger is connected, since the charger does not have a charging identification signal terminal, the activation drive circuit 200 will not be driven to open at this time, and the battery charging circuit cannot be activated for charging. The power current passes through the control circuit 100 and the first resistor RK6 and then outputs a high level to the control unit, so that the safety performance of the charger bidirectional identification circuit 10 is better.

[0034] It can be understood that when the charger sends the charging identification signal CHG_SW to the power connection identification circuit 300 and connects to the battery, the current pulls down the control terminal level of the first transistor QK2 to turn it on, and then reaches the control terminal of the second transistor QK7 after passing through the fourth resistor RK8. After the control terminal reaches a high level, the second transistor QK7 is turned on, and the charging activation signal CHG_ATV level is pulled down. At the same time, the battery management system (BMS) protection board detects that the charging activation signal CHG_ATV is pulled low, and the battery starts up. At this time, the power supply current passes through the second resistor RK 1 and the first resistor RK6, then output a low level to the control end (MCU_IO) of the control unit through the SW_ON end, and the battery end recognizes that the charger is connected to start the charging main circuit; when there is no charging identification signal CHG_SW input to the charging identification signal enable end of the charger, the charger is not connected to the battery, and the power current passes through the second resistor RK1 and the first resistor RK6 in turn, and then outputs a high level through the SW_ON end, and the first transistor QK2 and the second transistor QK7 are turned off in turn. At this time, the charging activation signal CHG_ATV is at a high level, so it will not be recognized by the battery end. In other words, when the charging activation signal CHG_ATV is at a low level and the control end of the control unit is at a low level, it can be recognized by the battery end, and then charged; when the charging activation signal CHG_ATV is at a high level and the control end of the control unit is at a high level, it is not recognized by the battery end, and there is no charging action. In this way, effective charging identification detection can be achieved with good safety performance.

[0035] In this embodiment, the first transistor QK2 is a PNP transistor, whose first end is the emitter, the second end is the collector, and the control end is the base; the second transistor QK7 is an NPN transistor, whose first end is the collector, the second end is the emitter, and the control end is the base.

[0036] Furthermore, the bidirectional diode ZK1 can absorb interference when the charging identification signal CHG_SW is connected to the battery terminal, thereby preventing the circuit components from being damaged due to sudden voltage changes.

[0037] Furthermore, the power-on identification circuit 300 also includes a fuse FK1, a first end of the fuse FK1 is connected to a first end of the bidirectional diode ZK1, and a second end of the fuse FK1 is used to connect to a charging identification signal enable end of the charger, so as to combine with the bidirectional diode ZK1 to absorb interference when the charging identification signal CHG_SW is connected to the external battery end, thereby avoiding interference from redundant signals.

[0038] In one embodiment, the power-on identification circuit 300 further includes a universal diode DK1, the anode of the universal diode DK1 is connected to the first end of the first resistor RK6, and the cathode of the universal diode DK1 is connected to the first end of the fuse FK1. It can be understood that the universal diode DK1 can prevent the charging identification signal CHG_SW from having a high voltage backflow and causing damage to circuit components.

[0039] In one embodiment, the control circuit 100 further includes a third resistor RK3, and the second end of the second resistor RK1 is connected to the first end of the first resistor RK6 through the third resistor RK3. In this embodiment, the second resistor RK1 is connected in series with the third resistor RK3, and the third resistor RK3 is connected in series with the universal diode DK1 to protect the universal diode DK1 and avoid the situation where the universal diode DK1 is broken down due to excessive current.

[0040] In one embodiment, the control circuit 100 further includes a filter capacitor CK6, the upper half of the filter capacitor CK6 is connected to the first end of the second resistor RK1, and the lower half of the filter capacitor CK6 is connected to the second end of the second resistor RK1. It can be understood that the filter capacitor CK6 is connected in parallel with the second resistor RK1 to form a resistor-capacitor loop, which can filter the power supply voltage, increase the circuit's anti-interference ability, and avoid sudden voltage changes.

[0041] In one embodiment, the activation driving circuit 200 further includes a fifth resistor RK10, a first end of the fifth resistor RK10 is connected to a second end of the fourth resistor RK8, and a second end of the fifth resistor RK10 is connected to a second end of the second transistor QK7. In this embodiment, when the first transistor QK2 is turned on, the current is divided by the fourth resistor RK8 and the fifth resistor RK10, so that the second transistor QK7 is turned on. At this time, the fifth resistor RK10 is used to increase the anti-interference ability of the activation driving circuit 200.

[0042] In one embodiment, at least one of the fourth resistor RK8 and the fifth resistor RK10 is a variable resistor. When one or both of the fourth resistor RK8 and the fifth resistor RK10 are variable resistors, the resistance ratio of the fourth resistor RK8 and the fifth resistor RK10 can be adjusted by adjusting the resistance of one or both of the fourth resistor RK8 and the fifth resistor RK10, thereby adjusting the conduction condition of the second transistor QK7 to adapt to more models of the second transistor QK7.

[0043] The present disclosure also provides a charger bidirectional identification device, comprising any charger bidirectional identification circuit 10 of the above embodiments. In this embodiment, when the device adopts the charger bidirectional identification circuit 10, it can determine whether the charging activation signal CHG_ATV is pulled low according to the charging identification signal enable CHG_SW state, thereby determining whether the battery is charged.

[0044] Compared with the prior art, the present invention has at least the following advantages:

[0045] The charger bidirectional identification circuit 10 utilizes the charging identification signal enable terminal of the charger. After being connected to the circuit, the driving circuit is turned on. While activating the battery, the charging identification signal CHG_SW is transmitted to the IO terminal of the control unit MCU through the control terminal of the control unit to realize charging identification detection. If a general charger is connected, since it does not have a charging identification signal terminal, the activation drive circuit 200 will not be driven to open at this time, and the battery charging circuit cannot be activated for charging. The power current passes through the control circuit 100 and the first resistor RK6 and then outputs a high level to the control unit, so that the safety performance of the charger bidirectional identification circuit 10 is better.

[0046] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the disclosed patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the disclosed patent shall be subject to the attached claims.

Claims

1. A charger bidirectional identification circuit, characterized in that: include: A control circuit, wherein the power terminal of the control circuit is used to connect to a reference power supply; an activation drive circuit, wherein a power receiving end of the activation drive circuit is connected to an output end of the control circuit, a signal activation end of the activation drive circuit is used to connect to a battery, and a ground end of the activation drive circuit is grounded; The power-on identification circuit includes a first resistor and a bidirectional diode, wherein the first end of the first resistor is respectively connected to the output two ends of the control circuit and the first end of the bidirectional diode, the second end of the first resistor is used to connect to the control end of the control unit, the first end of the bidirectional diode is also used to connect to the charging identification signal enable end of the charger, and the second end of the bidirectional diode is grounded.

2. The charger bidirectional identification circuit according to claim 1, characterized in that: The power-on identification circuit further includes a fuse, a first end of the fuse is connected to the first end of the bidirectional diode, and a second end of the fuse is used to connect to a charging identification signal enable end of a charger.

3. The charger bidirectional identification circuit according to claim 2, characterized in that: The power-on identification circuit further includes a universal diode, an anode of the universal diode is connected to the first end of the first resistor, and a cathode of the universal diode is connected to the first end of the fuse.

4. The charger bidirectional identification circuit according to claim 1, characterized in that: The control circuit includes a first transistor and a second resistor, the first end of the second resistor is connected to a reference power supply, the second end of the second resistor is respectively connected to the first end of the first resistor and the control end of the first transistor, the first end of the first transistor is connected to the first end of the second resistor, and the second end of the first transistor is connected to the power receiving end of the activation drive circuit.

5. The charger bidirectional identification circuit according to claim 4, characterized in that: The control circuit further includes a third resistor, and the second end of the second resistor is connected to the first end of the first resistor through the third resistor.

6. The charger bidirectional identification circuit according to claim 4, characterized in that: The control circuit further includes a filter capacitor, wherein an upper end of the filter capacitor is connected to a first end of the second resistor, and a lower end of the filter capacitor is connected to a second end of the second resistor.

7. The charger bidirectional identification circuit according to claim 1, characterized in that: The activation drive circuit includes a fourth resistor and a second transistor, the first end of the fourth resistor is connected to an output end of the control circuit, the second end of the fourth resistor is connected to the control end of the second transistor, the first end of the second transistor is used to connect to the charging activation signal enable end of the battery, and the second end of the second transistor is grounded.

8. The charger bidirectional identification circuit according to claim 7, characterized in that: The activation drive circuit further includes a fifth resistor, a first end of the fifth resistor is connected to the second end of the fourth resistor, and a second end of the fifth resistor is connected to the second end of the second transistor.

9. The charger bidirectional identification circuit according to claim 8, characterized in that: At least one of the fourth resistor and the fifth resistor is a variable resistor.

10. A charger bidirectional identification device, characterized in that: The invention comprises the charger bidirectional identification circuit as described in any one of claims 1 to 9.

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