CN110601323B - Charging device and driving power supply generating circuit - Google Patents
Charging device and driving power supply generating circuit Download PDFInfo
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- CN110601323B CN110601323B CN201910806422.0A CN201910806422A CN110601323B CN 110601323 B CN110601323 B CN 110601323B CN 201910806422 A CN201910806422 A CN 201910806422A CN 110601323 B CN110601323 B CN 110601323B
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 71
- 239000003990 capacitor Substances 0.000 claims abstract description 59
- 238000004804 winding Methods 0.000 claims description 25
- 238000010248 power generation Methods 0.000 claims description 16
- 238000010586 diagram Methods 0.000 description 17
- 230000000087 stabilizing effect Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
Abstract
The invention relates to a charging device and a driving power supply generating circuit thereof, wherein the driving power supply generating circuit comprises a first diode and a first capacitor, the anode of the first diode is connected with a first node of a voltage conversion module of the charging device, the cathode of the first diode is connected with a first end of the first capacitor, the second end of the first resistor is connected with a positive output end of the voltage conversion module of the charging device, and in at least part of the period of operation of the voltage conversion module, the voltage of the first node is higher than the voltage of the positive output end. By implementing the technical scheme of the invention, the driving power supply generating circuit can ensure the stability of the driving voltage on the driving circuit, has simple structure and low cost, and reduces the complexity and layout difficulty of the PCB.
Description
Technical Field
The present invention relates to the field of battery charging, and in particular, to a charging device and a driving power generation circuit.
Background
In the field of battery charging, an anti-reflection diode DF needs to be added at the interface in order to protect the internal circuits of the charging device (e.g. charger, power supply), as shown in fig. 1. This diode DF may be located outside the charging device or inside it, and manufacturers producing charging devices are increasingly inclined to place this diode DF inside the charging device. In this way, the power loss generated by this diode DF greatly reduces the overall conversion efficiency of the charging device.
In order to improve efficiency, the relays may be connected in parallel to the two ends of the diode DF, as shown in fig. 2, the relays are attracted after the diode DF is turned on, the charging current is bypassed by the relays, and only a small part of the charging current flows through the diode DF, so that the loss of the diode DF is greatly reduced. Of course, the diode DF may be replaced by the MOS tube SF, as shown in fig. 3, when the body diode of the MOS tube SF is turned on, a forward driving voltage is applied between the gate and the source of the MOS tube SF, and the charging current flows through the conductive channel of the MOS tube SF, so that the conduction voltage drop is significantly reduced, and the effect of reducing the loss is also achieved.
Whether the relays are connected in parallel at the two ends of the diode DF or the MOS tube SF is used for replacing the diode DF, a driving power supply is needed. Taking the MOS tube SF as an example, the magnitude of the driving power supply does not exceed the gate limit voltage of the MOS tube SF, which is generally about 15V, with the output anode of the charging device as a reference. However, to generate the independent driving power source, a special auxiliary source winding circuit or an isolation conversion module is required, which not only increases the cost of the system, but also increases the complexity and layout difficulty of the PCB board of the charging device.
Disclosure of Invention
The invention aims to solve the technical problems of high cost, complex PCB and difficult layout in the prior art, and provides a charging device and a driving power supply generating circuit.
The technical scheme adopted for solving the technical problems is as follows: a driving power generation circuit of a charging device for driving an anti-reflection module by a driving circuit is constructed, the driving power generation circuit comprising: a first diode and a first capacitor, wherein the positive electrode of the first diode is connected with a first node of the voltage conversion module of the charging device, the negative electrode of the first diode is connected with the first end of the first capacitor, the second end of the first resistor is connected with the positive output end of the voltage conversion module of the charging device, and
The voltage of the first node is higher than the voltage of the positive output terminal during at least part of the period in which the voltage conversion module is operated.
Preferably, the first resistor is further included, and the first resistor is connected between the cathode of the first diode and the first end of the first capacitor.
Preferably, the capacitor further comprises a second resistor, and the second resistor is connected in parallel to two ends of the first capacitor.
Preferably, the voltage regulator further comprises a voltage regulator diode, wherein the cathode of the voltage regulator diode is connected with the first end of the first capacitor, and the anode of the voltage regulator diode is connected with the second end of the first capacitor.
The invention also constructs a charging device, which comprises a voltage conversion module, an anti-reverse module and further comprises:
A driving circuit; and
The driving power supply generating circuit described above.
Preferably, the output stage of the voltage conversion module is a BUCK voltage circuit, wherein the BUCK voltage circuit comprises a first MOS tube, a first inductor, a second diode and an output capacitor, a drain electrode of the first MOS tube is connected with a positive end of a previous stage output voltage, a source electrode of the first MOS tube is connected with a first end of the first inductor, a second end of the first inductor is a positive output end of the voltage conversion module, and the BUCK voltage circuit is used for being connected with a positive end of a storage battery through the anti-reverse module; the negative end of the output voltage of the previous stage is the negative output end of the voltage conversion module and is used for connecting with the negative end of the storage battery; the negative electrode of the second diode is connected with the first end of the first inductor, the first end of the output capacitor is connected with the second end of the first inductor, and the positive electrode of the second diode and the second end of the output capacitor are respectively connected with the negative output end of the voltage conversion module; and
The first end of the first inductor is the first node.
Preferably, the output stage of the voltage conversion module is an LLC circuit, and the LLC circuit includes a third diode, a fourth diode, an output capacitor, and a first transformer with a secondary winding having a center tap, where the center tap of the secondary winding of the first transformer is a positive output terminal of the voltage conversion module, and is used for connecting a positive terminal of a storage battery through the anti-reverse module; the negative electrode of the fourth diode is connected with the homonymous end of the secondary winding of the first transformer, the negative electrode of the third diode is connected with the homonymous end of the secondary winding of the first transformer, the positive electrode of the fourth diode is connected with the positive electrode of the third diode and is used as the negative output end of the voltage conversion module, and the output capacitor is connected between the positive output end and the negative output end of the voltage conversion module; and
The negative electrode of the fourth diode is the first node.
Preferably, the output stage of the voltage conversion module is a phase-shifted full-bridge circuit, and the phase-shifted full-bridge circuit includes: the secondary winding of the second transformer is provided with a center tap, the center tap of the secondary winding of the second transformer is connected with the first end of the second inductor, and the second end of the second inductor is a positive output end of the voltage conversion module and is connected with the positive end of the storage battery through the anti-reverse module; the negative electrode of the sixth diode is connected with the homonymous end of the secondary winding of the second transformer, the negative electrode of the fifth diode is connected with the homonymous end of the secondary winding of the second transformer, the positive electrode of the sixth diode is connected with the positive electrode of the fifth diode and is used as the negative output end of the voltage conversion module, and the output capacitor is connected between the positive output end and the negative output end of the voltage conversion module; and
The negative electrode of the sixth diode is the first node.
Preferably, the anti-reverse module comprises a seventh diode and a relay, wherein the positive electrode of the seventh diode is connected with the positive output end of the voltage conversion module, the negative electrode of the seventh diode is connected with the positive end of the storage battery, the relay is connected with the seventh diode in parallel, and the driving power supply generating circuit drives the relay through the driving circuit.
Preferably, the anti-reverse module comprises a first switching tube, a first end of the first switching tube is connected with the positive output end of the voltage conversion module, a second end of the first switching tube is connected with the positive end of the storage battery, and a control end of the first switching tube is connected with the output end of the driving circuit.
In the driving power supply generating circuit, the voltage of the first node is higher than the voltage of the positive output end of the voltage conversion module in at least part of time period, so that the voltage conversion module can charge the first capacitor through the first diode by the node. In addition, the driving power supply generating circuit built by the capacitor and the diode has the advantages of simple structure and low cost, and the complexity and layout difficulty of the PCB are reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings that are required for the description of the embodiments will be briefly described below, it being apparent that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art. In the accompanying drawings:
fig. 1 is a circuit diagram of a conventional first charging device and a secondary battery;
FIG. 2 is a circuit diagram of a conventional second type of charging device and a secondary battery;
fig. 3 is a circuit diagram of a third conventional charging device and a secondary battery;
FIG. 4 is a circuit diagram of a first embodiment of a charging device and a battery of the present invention;
fig. 5 is a circuit diagram of a charging device and a secondary battery according to a second embodiment of the present invention;
fig. 6 is a circuit diagram of a third embodiment of the charging device and battery of the present invention;
Fig. 7 is a circuit diagram of a fourth embodiment of the charging device and battery of the present invention;
fig. 8 is a circuit diagram of a fifth embodiment of the charging device and the storage battery of the present invention;
fig. 9 is a circuit diagram of a sixth embodiment of the charging device and the storage battery of the present invention;
fig. 10 is a circuit diagram of a seventh embodiment of the charging device and the secondary battery of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 4 is a circuit diagram of a charging device and a storage battery according to an embodiment of the present invention, firstly, it is explained that the charging device is, for example, a charger or a power supply, and is used for charging the storage battery, and includes a voltage conversion module, an anti-reflection module, a driving circuit and a driving power supply generating circuit 11. The voltage conversion module is used for converting the power supply voltage; the anti-reverse module is used for preventing the current of the storage battery from flowing into the charging device; the driving power generation circuit 11 drives the anti-reflection module through the driving circuit.
The driving power supply generating circuit 11 includes a first diode D and a first capacitor C. The positive electrode of the first diode D is connected with a first node of a voltage conversion module of the charging device, the negative electrode of the first diode D is connected with a first end of the first capacitor C, the second end of the first resistor C is connected with a positive output end of the voltage conversion module of the charging device, and in at least part of the period of operation of the voltage conversion module, the voltage of the first node is higher than that of the positive output end. In addition, the driving circuit is connected to the rear end of the first capacitor C, and the first capacitor C is used for providing driving voltage for the driving circuit. The anti-reverse module is an MOS tube SF, the source electrode of the MOS tube SF is connected with the positive output end of the voltage conversion module, the drain electrode of the MOS tube SF is connected with the positive end of the storage battery, and the grid electrode of the MOS tube SF is connected with the output end of the driving circuit.
Regarding the technical scheme of this embodiment, it is first explained that the driving power generation circuit can operate on the premise that: a first node is to be found inside the voltage conversion module of the charging device, the voltage Vn of which first node is to be higher than the voltage Vo at the positive output of the voltage conversion module for at least part of the period of time, so that the voltage conversion module can charge the first capacitor C via the first diode D via the first node. In addition, the first diode D is used for preventing the electric charge on the first capacitor C from flowing back to the node, and the first capacitor C is responsible for storing the electric charge, so as to ensure the stable driving voltage on the driving circuit.
Fig. 5 is a circuit diagram of a charging device and a second embodiment of a storage battery according to the present invention, where the charging device includes a voltage conversion module, an anti-reflection module, a driving circuit, and a driving power generation circuit 11, and the driving power generation circuit 11 of the embodiment is different from the driving power generation circuit shown in fig. 4 only in that: the voltage conversion module can charge the first capacitor C through the first node via the first diode D and the first resistor R1, and the first resistor R1 is responsible for controlling the magnitude of charging current on the first capacitor C.
Fig. 6 is a circuit diagram of a third embodiment of a charging device and a storage battery according to the present invention, wherein the charging device includes a voltage conversion module, an anti-reflection module, a driving circuit and a driving power generation circuit 11 are also built in or externally connected, and the driving power generation circuit 11 of the present invention is different from the driving power generation circuit shown in fig. 5 only in that: the capacitor further comprises a second resistor R2, and the second resistor R2 is connected in parallel with two ends of the first capacitor C. The voltage of the first capacitor C (i.e., the driving voltage) can be adjusted by adjusting the resistance of the second resistor R2, and the charging current of the first capacitor C can be adjusted according to the load and the voltage division ratio.
Fig. 7 is a circuit diagram of a fourth embodiment of a charging device and a storage battery according to the present invention, wherein the charging device includes a voltage conversion module, an anti-reflection module, a driving circuit and a driving power generation circuit 11 are also built in or externally connected, and the driving power generation circuit 11 of the present invention is different from the driving power generation circuit shown in fig. 5 only in that: the LED further comprises a voltage stabilizing diode Dz, wherein the cathode of the voltage stabilizing diode Dz is connected with the first end of the first capacitor C, and the anode of the voltage stabilizing diode Dz is connected with the second end of the first capacitor C. And, the zener diode Dz is used to ensure that the voltage on the first capacitor C does not exceed the maximum limit voltage of the anti-reflection module, and an 18V or 15V regulator is selected. Finally, it should be noted that the zener diode Dz is not necessary, and the zener diode Dz may be omitted if the voltage on the first capacitor C does not exceed the maximum limit voltage of the anti-reflection module.
Fig. 8 is a circuit diagram of a fifth embodiment of the charging device and the secondary battery of the present invention, which differs from the embodiment shown in fig. 7 only in that: the output stage of the voltage conversion module is a BUCK step-down circuit, the BUCK step-down circuit comprises a first MOS tube Sbuck, a first inductor L, a second diode Dbuck and an output capacitor Co, the drain electrode of the first MOS tube Sbuck is connected with the positive end of the output voltage of the previous stage, the source electrode of the first MOS tube Sbuck is connected with the first end of the first inductor L, the second end of the first inductor L is the positive output end of the voltage conversion module, and the BUCK step-down circuit is used for being connected with the positive end of a storage battery through an anti-reverse module; the negative end of the output voltage of the previous stage is the negative output end of the voltage conversion module and is used for connecting with the negative end of the storage battery; the negative electrode of the second diode Dbuck is connected with the first end of the first inductor L, the first end of the output capacitor Co is connected with the second end of the first inductor L, and the positive electrode of the second diode Dbuck and the second end of the output capacitor Co are respectively connected with the negative output end of the voltage conversion module. Furthermore, the first end of the first inductor (L) is a first node.
In this embodiment, the first node is selected from the connection point of the first MOS transistor Sbuck and the second diode Dbuck in the BUCK circuit, when the first MOS transistor Sbuck is turned on, the voltage Vn of the first node is higher than the voltage Vo of the positive output terminal, so that the first capacitor C can be charged through the first node, the first diode D and the first resistor R1, and when the first MOS transistor Sbuck is turned off, the second diode Dbuck is turned on, and although the voltage Vn of the first node is lower than the voltage Vo of the positive output terminal, the reverse blocking of the first diode D can prevent the charge on the first capacitor C from flowing back.
Fig. 9 is a circuit diagram of a sixth embodiment of the charging device and the secondary battery of the present invention, which differs from the embodiment shown in fig. 7 only in that: the output stage of the voltage conversion module is an LLC circuit, the LLC circuit comprises a third diode D11, a fourth diode D12, an output capacitor Co and a first transformer with a secondary winding provided with a center tap, and the center tap of the secondary winding of the first transformer is a positive output end of the voltage conversion module and is used for being connected with a positive end of a storage battery through an anti-reverse module; the negative electrode of the fourth diode D12 is connected with the homonymous end of the secondary winding of the first transformer, the negative electrode of the third diode D11 is connected with the homonymous end of the secondary winding of the first transformer, the positive electrode of the fourth diode D12 is connected with the positive electrode of the third diode D11 and serves as the negative output end of the voltage conversion module, and the output capacitor Co is connected between the positive output end and the negative output end of the voltage conversion module. The negative electrode of the fourth diode D12 is the first node.
In this embodiment, the first node is selected at the negative terminal of the secondary rectifier diode (fourth diode D12) of the LLC circuit, so that when the ac voltage output from the previous stage is in the positive half cycle, the third diode D11 is turned on, and at this time, the voltage Vn of the first node and the output terminal voltage Vo satisfy: vn=2 Vo, and thus the first capacitor C can be charged, thereby generating a desired driving voltage. When the alternating voltage output by the previous stage is in the negative half cycle, the fourth diode D12 is turned on, and at this time, the voltage Vn of the first node is 0, and the first diode D is turned off reversely, so that the electric charge on the first capacitor C can be prevented from flowing back to the first node.
Fig. 10 is a circuit diagram of a seventh embodiment of the charging device and the secondary battery of the present invention, which differs from the embodiment shown in fig. 7 only in that: the output stage of the voltage conversion module is a phase-shifted full-bridge circuit, and it should be noted that, compared with the LLC circuit shown in fig. 9, the phase-shifted full-bridge circuit of this embodiment mainly has the following differences: the primary side network of the transformer omits an inductor and a resonance capacitor; the secondary network of the transformer adds a filter inductance (second inductance L2). Specifically, the phase-shifting full-bridge circuit includes: the second transformer is provided with a fifth diode D21, a sixth diode D22, a second inductor L2, an output capacitor Co and a secondary winding, wherein the secondary winding of the second transformer is provided with a center tap, the center tap of the secondary winding of the second transformer is connected with a first end of the second inductor L2, and a second end of the second inductor L2 is a positive output end of the voltage conversion module and is connected with a positive end of the storage battery through the anti-reverse module; the negative electrode of the sixth diode D22 is connected with the homonymous end of the secondary winding of the second transformer, the negative electrode of the fifth diode D21 is connected with the homonymous end of the secondary winding of the second transformer, the positive electrode of the sixth diode D22 is connected with the positive electrode of the fifth diode D21, the negative electrode is used as the negative output end of the voltage conversion module, and the output capacitor Co is arranged between the positive output end and the negative output end of the voltage conversion module. The negative electrode of the sixth diode D22 is the first node.
In this embodiment, the first node is selected at the negative terminal of the secondary rectifying diode (sixth diode D22) of the phase-shifted full bridge circuit, such that when the fifth diode D21 is turned on, the voltage Vn of the first node and the voltage Vo at the positive output terminal satisfy: vn=2 Vo, and thus the first capacitor C can be charged, thereby generating a desired driving voltage. When the sixth diode D22 is turned on, the voltage Vn of the first node is 0, and the first diode D is turned off reversely, so as to prevent the charge on the first capacitor C from flowing back to the first node.
Finally, it should be noted that, although the anti-reflection module in the above embodiment is described by taking the MOS tube SF as an example, it should be understood that the MOS tube SF may be any other type of switching tube, and the first end of the switching tube is connected to the positive output end of the voltage conversion module, the second end of the first switching tube is connected to the positive end of the storage battery, and the control end of the first switching tube is connected to the output end of the driving circuit. In addition, in other embodiments, the anti-reverse module may further include a seventh diode and a relay, wherein an anode of the seventh diode is connected to the positive output terminal of the voltage conversion module, a cathode of the seventh diode is connected to the positive terminal of the battery, the relay is connected in parallel with the seventh diode, and the driving power generation circuit drives the relay through the driving circuit.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any such modifications, equivalents, and improvements that fall within the spirit and principles of the present invention are intended to be covered by the following claims.
Claims (6)
1. The utility model provides a charging device, includes voltage conversion module, connects the anti-module of preventing between the positive output of voltage conversion module and the positive end of battery, its characterized in that still includes:
A driving circuit; and
A driving power supply generating circuit for driving the anti-reflection module through the driving circuit;
The driving power generation circuit includes: a first diode (D), a second resistor (R2) and a first capacitor (C), wherein the positive electrode of the first diode (D) is connected with the first node of the voltage conversion module, the negative electrode of the first diode (D) is connected with the first end of the first capacitor (C) and the input end of the driving circuit, the second end of the first capacitor (C) is connected with the positive output end of the voltage conversion module, the second resistor (R2) is connected in parallel with the two ends of the first capacitor (C), and
The voltage of the first node is higher than the voltage of the positive output terminal during at least part of the period in which the voltage conversion module is operated.
2. The charging device according to claim 1, wherein the output stage of the voltage conversion module is a BUCK step-down circuit, wherein the BUCK step-down circuit comprises a first MOS transistor (Sbuck), a first inductor (L1), a second diode (Dbuck) and an output capacitor (Co), a drain electrode of the first MOS transistor (Sbuck) is connected to a positive end of the output voltage of the previous stage, a source electrode of the first MOS transistor (Sbuck) is connected to a first end of the first inductor (L1), and a second end of the first inductor (L1) is a positive output end of the voltage conversion module and is used for being connected to a positive end of a storage battery through the anti-reverse module; the negative end of the output voltage of the previous stage is the negative output end of the voltage conversion module and is used for connecting with the negative end of the storage battery; the negative electrode of the second diode (Dbuck) is connected with the first end of the first inductor (L1), the first end of the output capacitor (Co) is connected with the second end of the first inductor (L1), and the positive electrode of the second diode (Dbuck) and the second end of the output capacitor (Co) are respectively connected with the negative output end of the voltage conversion module; and
The first end of the first inductor (L1) is the first node.
3. The charging device according to claim 1, wherein the output stage of the voltage conversion module is an LLC circuit, and the LLC circuit comprises a third diode (D11), a fourth diode (D12), an output capacitor (Co), and a first transformer with a secondary winding center tap, wherein the center tap of the secondary winding of the first transformer is the positive output terminal of the voltage conversion module, and is used for connecting the positive terminal of a battery through the anti-reverse module; the negative electrode of the fourth diode (D12) is connected with the homonymous end of the secondary winding of the first transformer, the negative electrode of the third diode (D11) is connected with the homonymous end of the secondary winding of the first transformer, the positive electrode of the fourth diode (D12) is connected with the positive electrode of the third diode (D11) and serves as the negative output end of the voltage conversion module, and the output capacitor (Co) is connected between the positive output end and the negative output end of the voltage conversion module; and
The negative electrode of the fourth diode (D12) is the first node.
4. The charging device of claim 1, wherein the output stage of the voltage conversion module is a phase-shifted full-bridge circuit, and the phase-shifted full-bridge circuit comprises: a fifth diode (D21), a sixth diode (D22), a second inductor (L2), an output capacitor (Co) and a secondary winding of the second transformer with a center tap, wherein the center tap of the secondary winding of the second transformer is connected with a first end of the second inductor (L2), and a second end of the second inductor (L2) is a positive output end of the voltage conversion module and is connected with a positive end of a storage battery through the anti-reverse module; the negative electrode of the sixth diode (D22) is connected with the homonymous end of the secondary winding of the second transformer, the negative electrode of the fifth diode (D21) is connected with the homonymous end of the secondary winding of the second transformer, the positive electrode of the sixth diode (D22) is connected with the positive electrode of the fifth diode (D21) and serves as the negative output end of the voltage conversion module, and the output capacitor (Co) is connected between the positive output end and the negative output end of the voltage conversion module; and
The negative electrode of the sixth diode (D22) is the first node.
5. The charging device according to any one of claims 1 to 4, wherein the anti-reverse module includes a seventh diode and a relay, wherein an anode of the seventh diode is connected to a positive output terminal of the voltage conversion module, a cathode of the seventh diode is connected to a positive terminal of a storage battery, the relay is connected in parallel with the seventh diode, and the driving power supply generation circuit drives the relay through the driving circuit.
6. The charging device according to any one of claims 1 to 4, wherein the anti-reverse module comprises a first switching tube, a first end of the first switching tube is connected to a positive output end of the voltage conversion module, a second end of the first switching tube is connected to a positive end of the storage battery, and a control end of the first switching tube is connected to an output end of the driving circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910806422.0A CN110601323B (en) | 2019-08-29 | Charging device and driving power supply generating circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910806422.0A CN110601323B (en) | 2019-08-29 | Charging device and driving power supply generating circuit |
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| CN110601323A CN110601323A (en) | 2019-12-20 |
| CN110601323B true CN110601323B (en) | 2024-07-05 |
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| CN210839041U (en) * | 2019-08-29 | 2020-06-23 | 深圳英驱新能源有限公司 | Charging device and driving power generation circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN210839041U (en) * | 2019-08-29 | 2020-06-23 | 深圳英驱新能源有限公司 | Charging device and driving power generation circuit |
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