Charger boost control circuit and charger

Abstract

The present invention relates to the technical field of new energy vehicles, and discloses a charger boost control circuit and a charger. The boost control module of the circuit comprises a voltage regulating device with adjustable conduction degree, and the conduction degree of the voltage regulating device affects the voltage magnitude of a battery charging voltage. The present invention boosts a direct current voltage output by a PFC through a boost module to obtain a battery charging voltage, and outputs the battery charging voltage to the boost control module. The boost control module compares the battery charging voltage with a battery calibration voltage. When the battery charging voltage is inconsistent with the battery calibration voltage, the boost control module adjusts the conduction degree of the voltage regulating device to adjust the battery charging voltage. The boost control module charges a battery pack through the adjusted battery charging voltage, thereby avoiding the situation that the voltage output by the boost module cannot be adjusted according to actual conditions, and effectively improving the charging efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to a charger boost control circuit and a charger. Background Art

[0002] In new energy vehicles, on-board chargers generally adopt a two-stage architecture. The front-stage power factor correction module (Power Factor Correction, PFC) is mainly responsible for power factor correction, converting the AC power input from the charging pile into DC power for output. The rear-stage boost module, that is, the DC / DC circuit, draws power from the PFC bus to achieve isolation and voltage regulation functions. When the connected charging pile is a 400V platform and the vehicle's battery pack is an 800V platform, the boost module can be used to boost the voltage and realize vehicle charging.

[0003] At that time, after the components of the boost module were fixed, the output voltage of the boost module could not be adjusted according to the actual situation. When the output voltage was greater than the rated voltage of the battery pack, the battery pack would be unable to withstand the excessively high voltage, resulting in reduced charging efficiency. When the output voltage was less than the rated voltage of the battery pack, the charging process might become slow, resulting in reduced charging efficiency. Therefore, the output voltage of the boost module of the existing charger would affect the charging efficiency of the battery pack if it could not be adjusted.

[0004] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0005] The main purpose of the present invention is to provide a charger boost control circuit and a charger, aiming to solve the technical problem that when the voltage output by the boost module of the charger after boosting is inconsistent with the calibrated voltage of the battery pack, the charging efficiency will be affected.

[0006] To achieve the above object, the present invention provides a charger boost control circuit, the circuit comprising: a boost module and a boost control module;

[0007] The boost control module is connected to the boost module and the battery pack respectively, and the boost module is connected to the PFC of the charger;

[0008] Wherein, the boost control module includes a voltage regulating device with adjustable conduction degree, and the conduction degree of the voltage regulating device affects the voltage magnitude of the battery charging voltage;

[0009] The boost module is used to boost the DC voltage output by the PFC to obtain the battery charging voltage, and output the battery charging voltage to the boost control module;

[0010] The boost control module is used to compare the battery charging voltage with the battery calibration voltage;

[0011] The boost control module is further configured to adjust the conduction degree of the voltage regulating device to adjust the battery charging voltage when the battery charging voltage is inconsistent with the battery calibration voltage;

[0012] The boost control module is also used to charge the battery pack through the adjusted battery charging voltage.

[0013] Optionally, the boost control module further includes: a comparison unit;

[0014] The voltage adjustment device is an insulated gate bipolar transistor;

[0015] The gate of the voltage regulating device is connected to the output end of the comparison unit, the emitter of the voltage regulating device is respectively connected to the input end of the comparison unit and the positive electrode of the battery pack, and the collector of the voltage regulating device is connected to the boost module;

[0016] The comparison unit is used to collect the battery charging voltage output by the voltage adjustment device to the battery pack, and compare the battery charging voltage with the battery calibration voltage;

[0017] The comparison unit is further configured to output a high-level driving signal to the gate of the voltage regulating device to increase the conduction degree of the voltage regulating device when the battery charging voltage is less than the battery calibration voltage;

[0018] The voltage regulating device is used to increase the battery charging voltage when the conduction degree increases, so as to obtain the adjusted battery charging voltage.

[0019] Optionally, the comparison unit is further configured to output a low-level driving signal to the gate of the voltage regulating device to reduce the conduction degree of the voltage regulating device when the battery charging voltage is greater than the battery calibration voltage;

[0020] The voltage regulating device is used to reduce the battery charging voltage when the conduction degree decreases, so as to obtain the adjusted battery charging voltage.

[0021] Optionally, the comparison unit includes: a first operational amplifier, a first resistor and a second resistor;

[0022] The non-inverting input terminal of the first operational amplifier is connected to a reference source, the inverting input terminal of the first operational amplifier is respectively connected to the first end of the first resistor and the first end of the second resistor, the second end of the first resistor is respectively connected to the emitter of the voltage regulating device and the positive electrode of the battery pack, the second end of the second resistor is grounded, and the output terminal of the first operational amplifier is connected to the gate of the voltage regulating device.

[0023] Optionally, the boost module includes: a first inductor, a first transistor and a first capacitor;

[0024] The first end of the first inductor is connected to the first end of the PFC and the first end of the first capacitor respectively, the second end of the first capacitor is connected to the second end of the PFC, the second end of the first inductor is connected to the collector of the first transistor and the collector of the voltage adjustment device respectively, and the emitter of the first transistor is connected to the second end of the PFC.

[0025] Optionally, the circuit further includes: a protection module;

[0026] The protection module is respectively connected to the emitter of the voltage regulating device and the battery pack;

[0027] The protection module is used to collect the adjusted battery charging voltage output by the voltage adjustment device to the battery pack;

[0028] The protection module is further used to disconnect the charging circuit between the voltage regulating device and the battery pack when the adjusted battery charging voltage reaches a preset voltage threshold.

[0029] Optionally, the protection module includes: a switch device, a first diode, a third resistor and a first voltage stabilizing diode;

[0030] The drain of the switching device is connected to the negative electrode of the battery pack, the source of the switching device is connected to the PFC, the gate of the switching device is respectively connected to the cathode of the first diode and the first end of the third resistor, the anode of the first diode is connected to the anode of the first voltage regulator diode, and the cathode of the first voltage regulator diode and the second end of the third resistor are both connected to the emitter of the voltage adjustment device.

[0031] Optionally, the circuit further includes: a compensation module and a transformer;

[0032] The compensation module is connected to the primary side of the transformer, the secondary side of the transformer and the PFC respectively, the first end of the secondary side of the transformer is connected to the PFC, and the second end of the secondary side of the transformer is connected to the first end of the first inductor;

[0033] The compensation module is used to obtain power supply information of the charging pile when the charging pile is connected to the PFC, and determine the standard power supply voltage of the charging pile according to the power supply information;

[0034] The compensation module is further used to detect whether the DC voltage output by the PFC is consistent with the standard power supply voltage;

[0035] The compensation module is further configured to connect the primary side of the transformer to the PFC when it is detected that the DC voltage is inconsistent with the standard power supply voltage, so that the DC voltage is output to the primary side of the transformer;

[0036] The transformer is used to induce a compensation voltage on the secondary side of the transformer when the primary side of the transformer receives the DC voltage, so as to compensate the DC voltage by the compensation voltage.

[0037] Optionally, the compensation module includes: a control unit, a second operational amplifier, a first MOS transistor, a second MOS transistor, a second diode, a third diode and a first switch;

[0038] The inverting input terminal of the second operational amplifier is connected to the control unit, the non-inverting input terminal of the second operational amplifier is respectively connected to the PFC, the secondary side of the transformer and the first end of the first capacitor, the output terminal of the second operational amplifier is connected to the first end of the first switch, the second end of the first switch is respectively connected to the gate of the first MOS tube and the gate of the second MOS tube, and the control end of the first switch is connected to the control unit;

[0039] The source of the first MOS transistor is connected to the first end of the secondary side of the transformer, the drain of the first MOS transistor is respectively connected to the first end of the primary side of the transformer and the anode of the second diode, and the cathode of the second diode is connected to the second end of the PFC;

[0040] The source of the second MOS tube is connected to the second end of the secondary side of the transformer, the drain of the second MOS tube is respectively connected to the second end of the primary side of the transformer and the anode of the third diode, and the cathode of the third diode is connected to the second end of the PFC.

[0041] In addition, to achieve the above-mentioned object, the present invention further provides a charger, which includes the charger boost control circuit as described above.

[0042] The present invention provides a charger boost control circuit and a charger, the circuit comprising: a boost module and a boost control module; the boost control module is connected to the boost module and the battery pack respectively, and the boost module is connected to the PFC of the charger; wherein the boost control module comprises a voltage adjustment device with adjustable conduction degree, and the conduction degree of the voltage adjustment device affects the voltage magnitude of the battery charging voltage; the present invention boosts the DC voltage output by the PFC through the boost module to obtain the battery charging voltage, and outputs the battery charging voltage to the boost control module; the boost control module compares the battery charging voltage with the battery calibration voltage; when the battery charging voltage is inconsistent with the battery calibration voltage, the boost control module adjusts the conduction degree of the voltage adjustment device to adjust the battery charging voltage; the boost control module charges the battery pack with the adjusted battery charging voltage. In the present invention, when the battery charging voltage output by the boost module is inconsistent with the battery calibration voltage, the boost control module adjusts the battery charging voltage by adjusting the conduction degree of the voltage adjustment device, thereby avoiding the situation that the voltage output by the boost module cannot be adjusted according to the actual situation, and effectively improving the charging efficiency of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a structural schematic diagram of a first embodiment of a charger boost control circuit of the present invention;

[0044] Figure 2 It is a structural schematic diagram of a second embodiment of a charger boost control circuit of the present invention;

[0045] Figure 3 This is a circuit schematic diagram of a second embodiment of a charger boost control circuit according to the present invention;

[0046] Figure 4 It is a structural schematic diagram of a third embodiment of a charger boost control circuit of the present invention;

[0047] Figure 5 A circuit schematic diagram of a protection module in a third embodiment of a charger boost control circuit of the present invention;

[0048] Figure 6 It is a structural schematic diagram of a fourth embodiment of a charger boost control circuit of the present invention;

[0049] Figure 7 The present invention is a circuit schematic diagram of a compensation module in a fourth embodiment of a charger boost control circuit.

[0050] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0051] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0052] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0053] It should be noted that the descriptions of "first", "second", etc. in the embodiments of the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0054] Reference Figure 1 , Figure 1 It is a structural schematic diagram of the first embodiment of the charger boost control circuit of the present invention.

[0055] like Figure 1 As shown, in this embodiment, the charger boost control circuit includes: a boost module 100 and a boost control module 200 .

[0056] The boost control module 200 is connected to the boost module 100 and the battery pack BT respectively, and the boost module 100 is connected to the PFC 300 of the charger.

[0057] It should be noted that the PFC 300 may be a module for converting input AC power into DC power, and may also be used to ensure that the current and voltage of the input AC power are in phase.

[0058] The boost control module 200 includes a voltage regulating device Q1 with adjustable conduction level, and the conduction level of the voltage regulating device Q1 affects the voltage level of the battery charging voltage.

[0059] It should be noted that the voltage regulator Q1 can be a transistor with adjustable conduction level, such as an insulated gate bipolar transistor, a MOS transistor or a triode. The conduction level of the voltage regulator Q1 can be controlled by controlling the voltage at the control terminal of the voltage regulator Q1.

[0060] The boost module 100 is used to boost the DC voltage output by the PFC 300 to obtain the battery charging voltage, and output the battery charging voltage to the boost control module 200 .

[0061] It should be noted that the above-mentioned battery charging voltage may be a voltage for charging the battery pack BT.

[0062] In a specific implementation, when a vehicle is connected to a charging pile 400, that is, when the PFC 300 of the charger is connected to the charging pile 400, the charging pile 400 can output an AC voltage to the PFC 300, and the PFC 300 converts the AC voltage and outputs a DC voltage, which can be a battery charging voltage, and then the PFC 300 can output the battery charging voltage to the boost control module 200. When the vehicle is connected to the charging pile 400, the electronic control unit (ECU) of the vehicle can communicate with the charging pile to obtain the AC voltage that the charging pile can provide, and detect whether the amplitude of the AC voltage is compared with the battery rating voltage of the battery pack BT. When the amplitude of the AC voltage is less than the battery rating voltage, the boost circuit of the boost module 100 can be controlled to be turned on, so that the boost module 100 can be operated. After the boost module 100 is operated, the DC voltage output by the PFC 300 can be boosted to obtain a battery charging voltage for charging the battery pack BT. In order to achieve adjustable battery charging voltage, the boost module 100 may output the battery charging voltage to the boost control module 200 .

[0063] It should be understood that the above-mentioned battery calibration voltage can be the rated voltage specified when the battery pack BT is designed. The battery calibration voltage can represent the expected voltage given by the manufacturer when designing and producing the battery pack BT, which is used to judge the battery capacity and type. The above-mentioned battery calibration voltage is the voltage displayed by the battery pack BT during normal operation, which is the average value of the output voltage, that is, the average voltage of the process from the start of discharge at full charge to the end of discharge.

[0064] The boost control module 200 is used to compare the battery charging voltage with the battery calibration voltage.

[0065] In a specific implementation, since the components of the boost module 100 are fixed, the battery charging voltage outputted by the boost module 100 is generally a fixed value. If the battery charging voltage obtained by the boost is inconsistent with the battery calibration voltage, the charging efficiency of the battery pack BT will be affected. For example, when the battery charging voltage is greater than the battery calibration voltage, the battery pack BT may be unable to withstand the excessively high voltage, resulting in reduced charging efficiency. When the battery charging voltage is less than the battery calibration voltage, the charging process may become slow, resulting in reduced charging efficiency. Based on this, in order to solve the above problems and improve the charging efficiency of the battery pack BT, the boost control module 200 may compare the battery charging voltage with the battery calibration voltage to determine whether the battery charging voltage is consistent with the battery calibration voltage.

[0066] The boost control module 200 is further configured to adjust the conduction degree of the voltage regulating device Q1 to adjust the battery charging voltage when the battery charging voltage is inconsistent with the battery calibrated voltage.

[0067] It should be noted that when the boost control module 200 detects that the battery charging voltage is inconsistent with the battery calibrated voltage, it can output a corresponding level signal to the control end of the voltage regulating device Q1 to control the conduction degree of the voltage regulating device Q1.

[0068] The boost control module 200 is also used to charge the battery pack BT using the adjusted battery charging voltage.

[0069] Specifically, the output end of the voltage adjustment device Q1 can be connected to the battery pack BT, and the input end can be connected to the boost module 100 to receive the battery charging voltage output by the boost module 100. When the battery charging voltage is less than the battery calibration voltage, the boost control module 200 can output a corresponding level signal to increase the conduction degree of the voltage adjustment device Q1, so that the conduction resistance of the voltage adjustment device Q1 is reduced, thereby increasing the battery charging voltage. Correspondingly, when it is detected that the battery charging voltage is less than the battery calibration voltage, the boost control module 200 can output a corresponding level signal to reduce the conduction degree of the voltage adjustment device Q1, so that the conduction resistance of the voltage adjustment device Q1 is increased, thereby reducing the battery charging voltage. In addition, after the battery charging voltage is adjusted by the voltage adjustment device Q1 once, the above process of comparing the battery charging voltage with the battery calibration voltage can be repeated, so that the adjusted battery charging voltage is consistent with or close to the battery calibration voltage, thereby charging the battery pack BT with the adjusted battery charging voltage, avoiding the influence of the inconsistency between the battery charging voltage and the battery calibration voltage on the charging efficiency, thereby improving the charging efficiency of the battery pack BT.

[0070] The boost control circuit of the charger in this embodiment includes: a boost module and a boost control module; the boost control module is connected to the boost module and the battery pack respectively, and the boost module is connected to the PFC of the charger; wherein the boost control module includes a voltage adjustment device with adjustable conduction degree, and the conduction degree of the voltage adjustment device affects the voltage magnitude of the battery charging voltage; in this embodiment, the DC voltage output by the PFC is boosted by the boost module to obtain the battery charging voltage, and the battery charging voltage is output to the boost control module; the boost control module compares the battery charging voltage with the battery calibration voltage; when the battery charging voltage is inconsistent with the battery calibration voltage, the boost control module adjusts the conduction degree of the voltage adjustment device to adjust the battery charging voltage; the boost control module charges the battery pack with the adjusted battery charging voltage. In this embodiment, when the battery charging voltage output by the boost module is inconsistent with the battery calibration voltage, the boost control module adjusts the battery charging voltage by adjusting the conduction degree of the voltage adjustment device, thereby avoiding the situation that the voltage output by the boost module cannot be adjusted according to the actual situation, and effectively improving the charging efficiency of the battery pack.

[0071] refer to Figure 2 , Figure 2 It is a structural schematic diagram of a second embodiment of a charger boost control circuit of the present invention.

[0072] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those of the above-mentioned first embodiment can be referred to the above introduction and will not be repeated later.

[0073] In this embodiment, the boost control module 200 further includes: a comparison unit 201 .

[0074] The voltage regulating device Q1 is an insulated gate bipolar transistor.

[0075] The gate of the voltage regulating device Q1 is connected to the output end of the comparison unit 201 , the emitter of the voltage regulating device Q1 is respectively connected to the input end of the comparison unit 201 and the positive electrode of the battery pack BT, and the collector of the voltage regulating device Q1 is connected to the boost module 100 .

[0076] The comparison unit 201 is used to collect the battery charging voltage output by the voltage adjustment device Q1 to the battery pack BT, and compare the battery charging voltage BT with the battery calibration voltage.

[0077] It should be noted that when the voltage regulating device Q1 is in the on state, the current output by the boost module 100 can flow through the collector of the voltage regulating device Q1 and through the emitter, and the comparison unit 201 can collect the current on the collector of the voltage regulating device Q1 and convert the current into a battery charging voltage.

[0078] refer to Figure 3 , Figure 3 This is a circuit diagram of a second embodiment of a charger boost control circuit according to the present invention. Figure 3 In the embodiment, the comparison unit 201 includes: a first operational amplifier A1, a first resistor R1 and a second resistor R2.

[0079] The non-inverting input terminal of the first operational amplifier A1 is connected to the reference source 202, the inverting input terminal of the first operational amplifier is respectively connected to the first end of the first resistor R1 and the first end of the second resistor R2, the second end of the first resistor R1 is respectively connected to the emitter of the voltage regulating device Q1 and the positive electrode of the battery pack BT, the second end of the second resistor R2 is grounded, and the output terminal of the first operational amplifier A1 is connected to the gate of the voltage regulating device Q1.

[0080] It should be noted that the reference source 202 may be a device for providing a battery calibration voltage.

[0081] like Figure 3 As shown, the boost module 100 includes: a first inductor L1, a first transistor Q2 and a first capacitor C1.

[0082] The first end of the first inductor L1 is connected to the first end of the PFC 300 and the first end of the first capacitor C1 respectively, the second end of the first capacitor C1 is connected to the second end of the PFC 300, the second end of the first inductor L1 is connected to the collector of the first transistor Q2 and the collector of the voltage adjustment device Q1 respectively, and the emitter of the first transistor Q2 is connected to the second end of the PFC 300.

[0083] It should be noted that the first inductor L1, the first transistor Q2 and the first capacitor C1 can constitute a boost circuit. The first transistor Q2 can be controlled by the vehicle's microcontroller or PWM controller outputting a corresponding PWM signal. When the first transistor Q2 is closed, the DC voltage output by the PFC 300 stores energy in the first inductor L1. When the first transistor Q2 is disconnected, the battery charging voltage output by the boost module 100 is composed of the DC voltage output by the PFC 300 and the energy storage voltage obtained by the energy storage of the first inductor L1, thereby achieving a boost to the DC voltage output by the PFC 300. Among them, the above-mentioned first capacitor C1 is used as a filter capacitor to filter the DC voltage input to the first inductor L1 and filter out the AC component.

[0084] It is understandable that the battery charging voltage output by the boost module 100 can be output through the voltage adjustment device Q1, and the first operational amplifier A1 can collect the battery charging voltage through the first resistor R1 and the second resistor R2, and compare the battery charging voltage with the battery calibration voltage.

[0085] The comparison unit 201 is further configured to output a high-level driving signal to the gate of the voltage regulating device Q1 to increase the conduction degree of the voltage regulating device Q1 when the battery charging voltage is lower than the battery calibrated voltage.

[0086] It should be noted that the conduction degree of the above-mentioned voltage regulating device Q1 is determined by the voltage difference Vge between the gate voltage and the emitter voltage. When the voltage difference Vge increases, the on-resistance (i.e., channel resistance) of the voltage regulating device Q1 will decrease, and the battery charging voltage output to the battery pack BT will increase at the same output current. When the voltage difference Vge decreases, the on-resistance of the voltage regulating device Q1 will increase, and the battery charging voltage output to the battery pack BT will decrease at the same output current.

[0087] The voltage regulating device Q1 is used to increase the battery charging voltage when the conduction degree increases, so as to obtain the adjusted battery charging voltage.

[0088] In a specific implementation, when the first operational amplifier A1 detects that the battery charging voltage is lower than the battery calibration voltage, it can output a high-level drive signal to the gate of the voltage regulating device Q1, so that the voltage difference Vge between the gate voltage and the emitter voltage of the voltage regulating device Q1 increases, thereby increasing the conduction degree of the voltage regulating device Q1, reducing the conduction resistance of the voltage regulating device Q1, and then increasing the battery charging voltage. The increased battery charging voltage can be the adjusted battery charging voltage.

[0089] Furthermore, in this embodiment, the comparison unit 201 is also used to output a low-level driving signal to the gate of the voltage regulating device Q1 to reduce the conduction degree of the voltage regulating device when the battery charging voltage is greater than the battery calibration voltage.

[0090] The voltage regulating device Q1 is used to reduce the battery charging voltage when the conduction degree decreases, so as to obtain the adjusted battery charging voltage.

[0091] In a specific implementation, when the first operational amplifier A1 detects that the battery charging voltage is greater than the battery calibration voltage, it can output a low-level drive signal to the gate of the voltage regulating device Q1, so that the voltage difference Vge between the gate voltage and the emitter voltage of the voltage regulating device Q1 is reduced, thereby reducing the conduction degree of the voltage regulating device Q1, increasing the conduction resistance of the voltage regulating device Q1, and then reducing the battery charging voltage. The reduced battery charging voltage can be the adjusted battery charging voltage.

[0092] This embodiment compares the battery charging voltage with the battery calibration voltage. When the battery charging voltage is less than the battery calibration voltage, a high-level driving signal is output to the gate of the voltage adjustment device to increase the conduction degree of the voltage adjustment device, thereby increasing the battery charging voltage. When the battery charging voltage is greater than the battery calibration voltage, a low-level driving signal is output to the gate of the voltage adjustment device to reduce the conduction degree of the voltage adjustment device, thereby reducing the battery charging voltage. Based on the above method, the battery charging voltage can be accurately adjusted, and after adjusting the battery charging voltage once, the above process can be repeated to re-execute the operation of comparing the battery charging voltage with the battery calibration voltage, which can ensure that the battery charging voltage is consistent with the battery calibration voltage, and effectively improve the adjustment accuracy of the battery charging voltage.

[0093] refer to Figure 4 , Figure 4 It is a structural schematic diagram of a third embodiment of a charger boost control circuit of the present invention.

[0094] Based on the second embodiment of the present application, in the third embodiment of the present application, the same or similar contents as those of the above-mentioned second embodiment can be referred to the above introduction and will not be repeated later.

[0095] In this embodiment, the circuit further includes: a protection module 500 .

[0096] The protection module 500 is connected to the emitter of the voltage regulating device Q1 and the battery pack BT respectively.

[0097] It should be noted that when the battery charging voltage output by the boost module 100 is too high and the boost control module 200 cannot make the battery charging voltage consistent with the battery calibrated voltage, the excessively high battery charging voltage will damage the battery. Therefore, this embodiment is proposed to protect the battery pack BT through the protection module 500.

[0098] The protection module 500 is used to collect the adjusted battery charging voltage output by the voltage adjustment device Q1 to the battery pack BT.

[0099] The protection module 500 is further configured to disconnect the charging circuit between the voltage regulating device Q1 and the battery pack BT when the adjusted battery charging voltage reaches a preset voltage threshold.

[0100] It should be noted that the above-mentioned preset voltage threshold may be a voltage upper limit value indicating that the voltage is relatively large and may damage the battery pack BT. The preset voltage threshold may be set according to the maximum voltage that the battery pack BT can withstand.

[0101] In a specific implementation, the protection module 500 can collect the adjusted battery charging voltage output to the battery pack BT, and determine whether the adjusted battery charging voltage exceeds the preset voltage threshold. When the adjusted battery charging voltage exceeds the preset voltage threshold, the charging circuit between the voltage adjustment device Q1 and the battery pack BT can be disconnected to protect the battery pack BT and prevent the battery pack BT from being damaged by high voltage.

[0102] refer to Figure 5 , Figure 5 A circuit schematic diagram of a protection module in the third embodiment of a charger boost control circuit of the present invention. Figure 5 In the embodiment, the protection module 500 includes: a switch device Q3, a first diode D1, a third resistor R3 and a first voltage stabilizing diode Z1.

[0103] The switch device Q3 is a PMOS tube.

[0104] The drain of the switching device Q3 is connected to the negative electrode of the battery pack BT, the source of the switching device Q3 is connected to the PFC 300, the gate of the switching device Q3 is respectively connected to the cathode of the first diode D1 and the first end of the third resistor R3, the anode of the first diode D1 is connected to the anode of the first voltage regulator diode Z1, and the cathode of the first voltage regulator diode Z1 and the second end of the third resistor R3 are both connected to the emitter of the voltage regulator device Q1.

[0105] In a specific implementation, a first voltage stabilizing diode Z1 having a reverse breakdown voltage of the above-mentioned preset voltage threshold may be selected. A third resistor R3 having a specific resistance value may be selected so that the adjusted battery charging voltage is lower than the voltage at the source of the switch device Q3 after being divided by the third resistor R3. When the adjusted battery charging voltage is lower than the preset voltage threshold, the first voltage stabilizing diode Z1 is in a cut-off state, and the voltage output to the gate of the switch device Q3 through the third resistor R3 is lower than the source voltage, so that the switch device Q3 is in a conducting state. At this time, the charging circuit between the voltage regulating device Q1 and the battery pack BT is in a conducting state, and the boost control module 200 can charge the battery pack BT through the adjusted battery charging voltage. When the adjusted battery charging voltage is greater than the preset voltage threshold, the first voltage stabilizing diode Z1 reversely breaks down, and the adjusted battery charging voltage is output to the gate of the switch device Q3 through the first diode D1. The battery charging voltage is greater than the source voltage of the switch device Q3, so that the switch device Q3 is disconnected, thereby disconnecting the charging circuit between the voltage regulating device Q1 and the battery pack BT, thereby protecting the battery pack BT.

[0106] refer to Figure 6 , Figure 6 It is a structural schematic diagram of a fourth embodiment of a charger boost control circuit of the present invention.

[0107] Based on the second and third embodiments of the present application, in the third embodiment of the present application, the contents that are the same or similar to the above-mentioned second and third embodiments can be referred to the above introduction and will not be repeated later.

[0108] In this embodiment, the circuit further includes: a compensation module 600 and a transformer.

[0109] The transformer is Figure 6 It consists of the primary side of the transformer T1 and the secondary side of the transformer T2.

[0110] The compensation module 600 is connected to the transformer primary T1, the transformer secondary T2 and the PFC 300 respectively, the first end of the transformer secondary T2 is connected to the PFC 300, and the second end of the transformer secondary T2 is connected to the first end of the first inductor L1.

[0111] It should be noted that when the charging pile 400 is connected to the charger, due to the interference between the charging pile 400 and the charger line, the actual voltage received by the PFC 300 deviates from the voltage provided by the charging pile 400, resulting in failure to output an accurate DC voltage, which in turn affects the charging of the battery pack BT. Therefore, this embodiment is proposed to solve the above problem by setting a compensation module 600 so that the PFC outputs an accurate DC voltage.

[0112] The compensation module 600 is used to obtain the power supply information of the charging pile 400 when the charging pile 400 is connected to the PFC 300, and determine the standard power supply voltage of the charging pile 400 according to the power supply information.

[0113] It should be noted that the above power supply information may be power information that the charging pile 400 can provide, and may include the AC voltage that the charging pile 400 can provide.

[0114] In a specific implementation, when the compensation module 600 detects that the charging pile 400 is connected to the PFC 300, it shakes hands with the charging pile 400 to establish a data transmission channel, and obtains the power supply information that the charging pile 400 can provide through the data transmission channel, and determines the standard AC voltage that the charging pile 400 can provide from the power supply information, and determines the standard power supply voltage that should be obtained after the PFC 300 performs DC conversion based on the amplitude of the AC voltage, that is, the standard power supply voltage is in DC form, and the value is consistent with the amplitude of the standard AC voltage.

[0115] The compensation module 600 is further used to detect whether the DC voltage output by the PFC 300 is consistent with the standard supply voltage.

[0116] The compensation module 600 is further configured to connect the transformer primary T1 to the PFC 300 when it is detected that the DC voltage is inconsistent with the standard power supply voltage, so that the DC voltage is output to the transformer primary T1.

[0117] It should be noted that the compensation module 600 can collect the DC voltage output after the PFC 300 converts the actual AC power input, and then compares the DC voltage with the standard power supply voltage to determine whether the DC voltage is consistent with the standard power supply voltage. When the DC voltage is inconsistent with the standard power supply voltage, the DC voltage can be compensated by a transformer so that the compensated DC voltage is consistent with the standard power supply voltage.

[0118] refer to Figure 7 , Figure 7 The present invention is a circuit schematic diagram of a compensation module in a fourth embodiment of a charger boost control circuit. Figure 7 In the embodiment, the compensation module 600 includes: a control unit 601, a second operational amplifier A2, a first MOS transistor NM1, a second MOS transistor PM1, a second diode D2, a third diode D3 and a first switch S1.

[0119] An inverting input terminal of the second operational amplifier A2 is connected to the control unit 601, a non-inverting input terminal of the second operational amplifier A2 is respectively connected to the PFC 300, the secondary side T2 of the transformer and the first end of the first capacitor C1, an output terminal of the second operational amplifier A2 is connected to a first end of the first switch S1, a second end of the first switch S1 is respectively connected to a gate of the first MOS transistor NM1 and a gate of the second MOS transistor PM1, and a control terminal of the first switch S1 is connected to the control unit 601.

[0120] The source of the first MOS transistor NM1 is connected to the first end of the secondary side T2 of the transformer, the drain of the first MOS transistor NM1 is respectively connected to the first end of the primary side T1 of the transformer and the anode of the second diode D2, and the cathode of the second diode D2 is connected to the second end of the PFC 300.

[0121] The source of the second MOS transistor PM1 is connected to the second end of the transformer secondary side T2, the drain of the second MOS transistor PM2 is respectively connected to the second end of the transformer primary side T1 and the anode of the third diode D3, and the cathode of the third diode D3 is connected to the second end of the PFC 300.

[0122] It should be noted that the first switch S1 may be a switch controlled by the control unit 601 , such as a relay, a MOS tube, a triode, an insulated gate bipolar transistor, etc. The control end of the first switch S1 is connected to the control unit 601 .

[0123] It can be understood that the first MOS transistor NM1 can be an NMOS transistor, and the second MOS transistor PM1 can be a PMOS transistor.

[0124] In a specific implementation, the control unit 601 can communicate with the charging pile 400, obtain the power supply information of the charging pile 400, determine the standard power supply voltage of the charging pile 400 according to the power supply information, and output the determined standard power supply voltage to the inverting input terminal of the second operational amplifier A2. The non-inverting input terminal of the second operational amplifier A2 can collect the DC voltage output by the PFC 300, and when the DC voltage is inconsistent with the standard power supply voltage, output a corresponding control signal to control the conduction state of the first MOS tube NM1 or the second MOS tube PM1, so as to connect the primary side T1 of the transformer to the PFC 300.

[0125] It should be understood that after the control unit 601 is started, the first switch S1 can be controlled to be in a closed state, and can also be manually opened or closed by a user.

[0126] The transformer is used to induce a compensation voltage on the secondary side T2 of the transformer when the primary side T1 of the transformer receives the DC voltage, so as to compensate the DC voltage by the compensation voltage.

[0127] In a specific implementation, the first end of the transformer primary T1 and the first end of the transformer secondary T1 are both terminals of the same name. When the second operational amplifier A2 detects that the DC voltage is less than the standard power supply voltage, it can output a low-level signal to the first MOS transistor NM1 and the second MOS transistor PM1. Since the first MOS transistor NM1 is an NMOS transistor and the second MOS transistor PM1 is a PMOS transistor, the first MOS transistor NM1 is in a disconnected state after receiving the low-level signal, and the second MOS transistor PM1 is in a closed state after receiving the low-level signal. When the second MOS transistor PM1 is closed, the DC power output by the PFC 300 flows to the second end of the transformer primary T1 through the second end of the transformer secondary T2, and then flows from the second end of the transformer primary T1 to the first end of the transformer primary T1, and then flows from the first end of the transformer primary T1 to the second end of the PFC 300 through the second diode D2. At this time, the second end of the transformer primary T1 is the positive end, and the first end of the transformer primary T1 is the negative end, so a compensation voltage in which the second end of the transformer secondary T2 is the positive end and the first end of the transformer secondary T1 is the negative end can be sensed on the transformer secondary T2. Therefore, the direction of the compensation voltage is consistent with the direction of the DC voltage output by the PFC 300, and the compensation voltage can be superimposed on the DC voltage, thereby increasing the DC voltage.

[0128] It should be understood that the second operational amplifier A2 can output a high-level signal to the first MOS transistor NM1 and the second MOS transistor PM1 when detecting that the DC voltage is greater than the standard power supply voltage. Since the first MOS transistor NM1 is an NMOS transistor and the second MOS transistor PM1 is a PMOS transistor, the first MOS transistor NM1 is in a conducting state after receiving the high-level signal, and the second MOS transistor PM1 is in a disconnected state after receiving the low-level signal. When the first MOS transistor PM1 is closed, the DC power output by the PFC 300 flows through the first end of the transformer primary side T1 to the second end of the transformer primary side T1, and then flows from the second end of the transformer primary side T1 to the second end of the PFC 300 through the third diode D3. At this time, the first end of the transformer primary T1 is the positive end, and the second end of the transformer primary T1 is the negative end, so a compensation voltage in which the first end of the transformer secondary T2 is the positive end and the second end of the transformer secondary T1 is the negative end can be sensed on the transformer secondary T2. Therefore, the direction of the compensation voltage is opposite to the direction of the DC voltage output by the PFC 300, and the compensation voltage can offset a part of the DC voltage, thereby reducing the DC voltage.

[0129] It should be noted that after a round of compensation for the DC voltage, the above process can be repeated to re-execute the operation of detecting whether the DC voltage output by the PFC is consistent with the standard supply voltage, so as to ensure that the compensated DC voltage is consistent with the standard supply voltage, and ensure that the PFC 300 outputs an accurate DC voltage, thereby reducing the impact on the charging of the battery pack BT and improving the charging accuracy of the battery pack BT.

[0130] In addition, an embodiment of the present invention further provides a charger, which includes the charger boost control circuit described above.

[0131] Other embodiments or specific implementations of the stream data writing device of the present invention can refer to the above-mentioned alarm circuit embodiment, which will not be described in detail here.

[0132] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0133] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0134] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A charger boost control circuit, characterized in that: The circuit comprises: a boost module and a boost control module; The boost control module is connected to the boost module and the battery pack respectively, and the boost module is connected to the PFC of the charger; Wherein, the boost control module includes a voltage regulating device with adjustable conduction degree, and the conduction degree of the voltage regulating device affects the voltage magnitude of the battery charging voltage; The boost module is used to boost the DC voltage output by the PFC to obtain the battery charging voltage, and output the battery charging voltage to the boost control module; The boost control module is used to compare the battery charging voltage with the battery calibration voltage; The boost control module is further configured to adjust the conduction degree of the voltage regulating device to adjust the battery charging voltage when the battery charging voltage is inconsistent with the battery calibration voltage; The boost control module is further used to charge the battery pack through the adjusted battery charging voltage; The boost module includes: a first inductor, a first transistor and a first capacitor; The first end of the first inductor is connected to the first end of the PFC and the first end of the first capacitor respectively, the second end of the first capacitor is connected to the second end of the PFC, the second end of the first inductor is connected to the collector of the first transistor and the collector of the voltage adjustment device respectively, and the emitter of the first transistor is connected to the second end of the PFC; The circuit further includes: a compensation module and a transformer; The compensation module is connected to the primary side of the transformer, the secondary side of the transformer and the PFC respectively, the first end of the secondary side of the transformer is connected to the PFC, and the second end of the secondary side of the transformer is connected to the first end of the first inductor; The compensation module is used to obtain power supply information of the charging pile when the charging pile is connected to the PFC, and determine the standard power supply voltage of the charging pile according to the power supply information; The compensation module is further used to detect whether the DC voltage output by the PFC is consistent with the standard power supply voltage; The compensation module is further configured to connect the primary side of the transformer to the PFC when it is detected that the DC voltage is inconsistent with the standard power supply voltage, so that the DC voltage is output to the primary side of the transformer; The transformer is used to induce a compensation voltage on the secondary side of the transformer when the primary side of the transformer receives the DC voltage, so as to compensate the DC voltage by the compensation voltage; The compensation module includes: a control unit, a second operational amplifier, a first MOS tube, a second MOS tube, a second diode, a third diode and a first switch; The inverting input terminal of the second operational amplifier is connected to the control unit, the non-inverting input terminal of the second operational amplifier is respectively connected to the PFC, the first terminal of the secondary side of the transformer and the first terminal of the first capacitor, the output terminal of the second operational amplifier is connected to the first terminal of the first switch, the second terminal of the first switch is respectively connected to the gate of the first MOS transistor and the gate of the second MOS transistor, and the control terminal of the first switch is connected to the control unit; The source of the first MOS transistor is connected to the first end of the secondary side of the transformer, the drain of the first MOS transistor is respectively connected to the first end of the primary side of the transformer and the anode of the second diode, and the cathode of the second diode is connected to the second end of the PFC; The source of the second MOS tube is connected to the second end of the secondary side of the transformer, the drain of the second MOS tube is respectively connected to the second end of the primary side of the transformer and the anode of the third diode, and the cathode of the third diode is connected to the second end of the PFC.

2. The charger boost control circuit according to claim 1, characterized in that: The boost control module further includes: a comparison unit; The voltage adjustment device is an insulated gate bipolar transistor; The gate of the voltage regulating device is connected to the output end of the comparison unit, the emitter of the voltage regulating device is respectively connected to the input end of the comparison unit and the positive electrode of the battery pack, and the collector of the voltage regulating device is connected to the boost module; The comparison unit is used to collect the battery charging voltage output by the voltage adjustment device to the battery pack, and compare the battery charging voltage with the battery calibration voltage; The comparison unit is further configured to output a high-level driving signal to the gate of the voltage regulating device to increase the conduction degree of the voltage regulating device when the battery charging voltage is less than the battery calibration voltage; The voltage regulating device is used to increase the battery charging voltage when the conduction degree increases, so as to obtain the adjusted battery charging voltage.

3. The charger boost control circuit according to claim 2, characterized in that: The comparison unit is further configured to output a low-level driving signal to the gate of the voltage regulating device to reduce the conduction degree of the voltage regulating device when the battery charging voltage is greater than the battery calibration voltage; The voltage regulating device is used to reduce the battery charging voltage when the conduction degree decreases, so as to obtain the adjusted battery charging voltage.

4. The charger boost control circuit according to claim 2, characterized in that: The comparison unit includes: a first operational amplifier, a first resistor and a second resistor; The non-inverting input terminal of the first operational amplifier is connected to a reference source, the inverting input terminal of the first operational amplifier is respectively connected to the first end of the first resistor and the first end of the second resistor, the second end of the first resistor is respectively connected to the emitter of the voltage regulating device and the positive electrode of the battery pack, the second end of the second resistor is grounded, and the output terminal of the first operational amplifier is connected to the gate of the voltage regulating device.

5. The charger boost control circuit according to claim 4, characterized in that: The circuit further comprises: a protection module; The protection module is respectively connected to the emitter of the voltage regulating device and the battery pack; The protection module is used to collect the adjusted battery charging voltage output by the voltage adjustment device to the battery pack; The protection module is further used to disconnect the charging circuit between the voltage regulating device and the battery pack when the adjusted battery charging voltage reaches a preset voltage threshold.

6. The charger boost control circuit according to claim 5, characterized in that: The protection module includes: a switch device, a first diode, a third resistor and a first voltage stabilizing diode; The drain of the switching device is connected to the negative electrode of the battery pack, the source of the switching device is connected to the PFC, the gate of the switching device is respectively connected to the cathode of the first diode and the first end of the third resistor, the anode of the first diode is connected to the anode of the first voltage regulator diode, and the cathode of the first voltage regulator diode and the second end of the third resistor are both connected to the emitter of the voltage adjustment device.

7. A charger, characterized in that: The charger comprises a charger boost control circuit as claimed in any one of claims 1 to 6.

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