CN212751824U - High-power switching power supply circuit and power supply board - Google Patents
High-power switching power supply circuit and power supply board Download PDFInfo
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- CN212751824U CN212751824U CN202021270659.6U CN202021270659U CN212751824U CN 212751824 U CN212751824 U CN 212751824U CN 202021270659 U CN202021270659 U CN 202021270659U CN 212751824 U CN212751824 U CN 212751824U
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Abstract
The utility model provides a high-power switch power supply circuit and power panel, wherein, the high-power switch power supply circuit includes output rectifier module, relay, pre-charge circuit, voltage detection circuit and MCU controller, pre-charge circuit and relay are connected in parallel between output rectifier module and the battery to be charged, when the voltage of the battery to be charged is lower than the preset voltage, namely the electric quantity of the battery to be charged is lower than the preset value, MCU controller control pre-charge circuit work, pre-charge circuit output small charging current to the battery to be charged, when the voltage of the battery to be charged reaches the preset voltage, MCU controller control relay is closed, output rectifier module output large charging current to the battery to be charged, small charging current and large charging current are respectively output with different branch roads, the problem that pre-charge current and quick charge current share the same charging circuit and have the constant current control failure is solved, the charging reliability of the battery to be charged is improved.
Description
Technical Field
The utility model belongs to the technical field of switching power supply, especially, relate to a high-power switching power supply circuit and power strip.
Background
The battery charging device, such as a charger or a charger, needs to pre-charge when the battery is over-discharged, the pre-charge converts the battery voltage to a certain voltage into a large current for quick charging, the pre-charge current of the battery is small, and the pre-charge and quick charge stages are constant current charging and have precision requirements.
The traditional method for realizing the constant-current charging current control of the battery comprises the following steps: the same hardware circuit is adopted for pre-charging and large-current quick-charging, when the ratio of large current to small current is large, such as more than 50 times, the conventional hardware circuit is used, the pre-charging current is small and the offset voltage of the operational amplifier is large, and when the pre-charging current is controlled in a constant current mode, the problem that the pre-charging current cannot be detected exists, so that the pre-charging constant current control fails.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a high-power switching power supply circuit aims at solving the problem that traditional constant current control circuit can't realize the accurate control of little charging current constant current.
The embodiment of the utility model provides a first aspect provides a high-power switching power supply circuit, high-power switching power supply circuit includes output rectifier module and relay, the input of relay with the output of output rectifier module is connected, the output of relay is connected with the positive pole of waiting to charge the battery;
the high-power switching power supply circuit further comprises: the pre-charging circuit is connected with the relay in parallel, the voltage detection circuit is connected with the anode of the battery to be charged, and the MCU controller is connected with the voltage detection circuit;
the MCU controller is used for controlling the pre-charging circuit to work and controlling the relay to be switched off when the voltage of the battery to be charged is smaller than a preset voltage; and
and when the voltage of the battery to be charged is not less than the preset voltage, controlling the pre-charging circuit to stop working and controlling the relay to be closed.
In one embodiment, the pre-charging circuit comprises a small current control device, a switch device and a one-way conduction device which are electrically connected in sequence, wherein the input end of the small current control device is connected with the input end of the relay, and the output end of the one-way conduction device is connected with the output end of the relay;
the switching device is used for correspondingly switching on or switching off according to the switching control signal output by the MCU controller;
the small current control device is used for performing constant current conversion on the direct current power supply output by the output rectifying module when the switching device is switched on and outputting constant small charging current to the one-way switching device;
and the unidirectional conducting device is used for unidirectionally outputting the small charging current output by the small current control device to the battery to be charged when the switching device is conducted.
In one embodiment, the small current control device comprises a first resistor and a clamped first PNP triode;
the first end of the first resistor, the emitting electrode of the first PNP triode and the output end of the output rectifying module are interconnected, the second end of the first resistor, the input end of the switch device and the base electrode of the first PNP triode are interconnected, and the collecting electrode of the first PNP triode is connected with the controlled end of the switch device.
In one embodiment, the switching device includes a second resistor and a second PNP transistor;
the first end of the second resistor, the emitting electrode of the second PNP triode and the output end of the small current control device are connected, the second end of the second resistor and the base electrode of the second PNP triode are connected in common to form the controlled end of the switch device, and the collector electrode of the second PNP triode is the output end of the switch device.
In one embodiment, the pre-charge circuit further comprises a signal conversion circuit, wherein the signal conversion circuit comprises a third resistor, a fourth resistor, a fifth resistor, a capacitor and an NPN triode;
the first end of the third resistor is a controlled end of the pre-charging circuit, the second end of the third resistor, the first end of the fourth resistor, the first end of the capacitor and the base electrode of the NPN triode are interconnected, the second end of the fourth resistor, the second end of the capacitor and the emitter electrode of the NPN triode are all grounded, the collector electrode of the NPN triode is connected with the first end of the fifth resistor, and the second end of the fifth resistor is connected with the controlled end of the switching device.
In one embodiment, the high-power switching power supply circuit further comprises a transformer and a sampling resistor, one end of a secondary coil of the transformer is connected with the output rectifying module, and the other end of the secondary coil of the transformer is grounded;
the first end of the sampling resistor is connected with the negative electrode of the battery to be charged, and the second end of the sampling resistor is grounded.
In one embodiment, the high-power switching power supply circuit further comprises a large-current constant-current charging circuit, the large-current constant-current charging circuit is connected with the first end of the sampling resistor, and the large-current constant-current charging circuit comprises a signal amplifying circuit and a constant-current control circuit which are electrically connected;
the signal amplification circuit is used for carrying out signal amplification conversion on the voltage of the sampling resistor and feeding back the voltage to the constant current control circuit;
and the constant current control circuit is used for controlling the large charging current flowing through the relay to be constant according to the amplified voltage of the sampling resistor and the reference voltage.
In one embodiment, the constant current control circuit includes an operational amplifier, a non-inverting input terminal of the operational amplifier is connected to the reference voltage, and an inverting input terminal of the operational amplifier is connected to the amplified voltage of the sampling resistor.
In one embodiment, the magnitude of the large charging current is 50 to 100 times that of the small charging current.
A second aspect of the embodiments of the present invention provides a power strip, which includes the high power switching power supply circuit described above.
The utility model adopts the output rectifying module, the relay, the pre-charging circuit, the voltage detection circuit and the MCU controller to form a high-power switch power supply circuit, the pre-charging circuit and the relay are connected in parallel between the output rectifying module and the battery to be charged to provide charging currents with different current levels for the battery to be charged, when the voltage of the battery to be charged is lower than the preset voltage, namely the electric quantity of the battery to be charged is lower than the preset value, the MCU controller controls the pre-charging circuit to work, the pre-charging circuit outputs small charging current to the battery to be charged, when the voltage of the battery to be charged reaches the preset voltage, the MCU controller controls the relay to be closed, the output rectifying module outputs large charging current to the battery to be charged, the small charging current and the large charging current are respectively output by different branches, thereby solving the problem that the pre-charging current and the quick charging current share the same charging loop, the charging reliability of the battery to be charged is improved.
Drawings
Fig. 1 is a schematic diagram of a first module structure of a high-power switching power supply circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a second module of a high-power switching power supply circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a first circuit structure of a high-power switching power supply circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a second circuit structure of a high-power switching power supply circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a third module of a high-power switching power supply circuit according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a third circuit structure of a high-power switching power supply circuit according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a large-current constant-current charging circuit provided in an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a constant current control circuit provided in an embodiment of the present invention.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
A first aspect of the embodiments of the present invention provides a high power switching power supply circuit 100.
As shown in fig. 1, fig. 1 is a first schematic structural diagram of a high-power switching power supply circuit 100 provided in an embodiment of the present invention, in this embodiment, the high-power switching power supply circuit 100 includes an output rectifier module 10 and a relay 20, an input end of the relay 20 is connected to an output end of the output rectifier module 10, and an output end of the relay 20 is connected to a positive electrode BAT + of a battery 200 to be charged;
the high power switching power supply circuit 100 further includes: a pre-charging circuit 30 connected in parallel with the relay 20, a voltage detection circuit 40 connected to the positive electrode BAT + of the battery 200 to be charged, and an MCU controller 50 connected to the voltage detection circuit 40;
the MCU controller 50 is used for controlling the pre-charging circuit 30 to work and controlling the relay 20 to be switched off when the voltage of the battery 200 to be charged is less than the preset voltage; and
when the voltage of the battery 200 to be charged is not less than the preset voltage, the pre-charge circuit 30 is controlled to stop working and the relay 20 is controlled to close.
In this embodiment, the output rectifying module 10 converts the input ac power into a high-power dc power and provides a charging current for the rear-end battery 200 to be charged, and in order to prolong the service life of the battery 200 to be charged, when the overdischarge amount of the battery 200 to be charged is low, the battery needs to be precharged, and when the preset voltage is reached, the battery is switched to a fast charging mode, that is, the battery is switched from a small charging current to a large charging current.
Wherein, the constant current control method of large charging current adopts the sampling resistor R3 connected between the ground and the negative electrode BAT-of the battery 200 to be charged, as shown in FIG. 5, the non-grounding end of the sampling resistor R3 is connected with the large current constant current charging circuit 70, when the relay 20 is conducted, the sampling resistor R3 samples the large charging current flowing through the relay 20 and the battery 200 to be charged, the terminal voltage of the sampling resistor R3 indirectly feeds back the current of the large charging current, the current sampling signal is input to the large current constant current charging circuit 70 to realize the constant current function and the constant current precision control, the large current constant current charging circuit 70 can comprise a sampling current amplifying module, a constant current loop module, a constant voltage loop module, a switching power supply chip and other structures, the large power switching power supply circuit 100 further comprises a transformer 60, one end of the secondary coil of the transformer 60 is connected with the output rectifying module 10, the other end of the secondary coil of the transformer 60 is grounded, the large-current constant-current charging circuit 70 compares the magnitude of the current sampling signal with the reference voltage of the constant-current loop, when the current reaches a set charging current value, the constant-current loop enters into operation, the constant-voltage loop exits from operation, and the constant-current loop is connected with the pipe loop to perform power supply closed loop stability control, that is, the constant-current loop replaces a voltage loop to adjust the PWM or operating frequency of the power supply chip, so that the pulse width or frequency of the voltage input to the primary coil of the transformer 60 is changed, the output voltage and the output current of the output rectifying module 10 are changed, and the charging constant-current function and the constant-.
In one embodiment, as shown in fig. 7, the large-current constant-current charging circuit 70 includes a signal amplification circuit 71 and a constant-current control circuit 72;
the signal amplifying circuit 71 amplifies and converts the voltage of the sampling resistor R3, i.e., the current sampling signal Isense, to output an amplified current sampling signal Isense1, and feeds the amplified current sampling signal Isense1 back to the constant current control circuit 72, and the constant current control circuit 72 controls the large charging current flowing through the relay 20 to be constant according to the amplified voltage of the sampling resistor R3, i.e., the amplified current sampling signal Isense1 and the reference voltage.
The signal amplifying circuit 71 may be an operational amplifier or a triode amplifying circuit, the constant current control circuit 72 includes a constant current loop module, a constant voltage loop module, a switching power supply chip, and the like, and compares the amplified current sampling signal Isense1 with a reference voltage vref of the constant current loop module, when the current reaches a set charging current value, the constant current loop module enters into operation, the constant voltage loop module exits from operation, the constant current loop module takes over a loop to perform power supply closed loop stability control, that is, the constant current loop module replaces the constant voltage loop module to adjust the PWM or operating frequency of the switching power supply chip, thereby changing the pulse width or frequency of the voltage input to the primary coil of the transformer 60, changing the output voltage and output current of the output rectifying module 10, and realizing the charging constant current function and constant current precision control.
In another embodiment, as shown in fig. 8, in order to implement constant current and constant voltage control, the output terminal of the constant current control circuit 72 is connected to the output terminal of the output rectifier module 10 through a resistor voltage divider circuit, the constant current control circuit 72 includes an operational amplifier U1 and peripheral circuits, the non-inverting input terminal of the operational amplifier U1 is connected to a reference voltage Vref, the inverting input terminal of the operational amplifier is connected to the amplified voltage of the sampling resistor R3, i.e., the amplified current sampling signal Isense1, the operational amplifier compares the amplified current sampling signal Isense1 with the reference voltage Vref, and outputs a corresponding voltage comparison signal Vfb to a connection point of the resistance voltage dividing circuit, the voltage of the connection point is equal to the output voltage of the operational amplifier, when the voltage comparison signal Vfb changes, the output voltage VOUT and the current of the output rectifier module 10 correspondingly change, so as to realize the closed-loop output control of the output rectifier module 10.
In order to solve the problem that the constant current control circuit 72 with large charging current can not accurately detect small charging current, in this embodiment, two charging branches are provided between the output rectifying module 10 and the battery 200 to be charged, the relay 20 is used for flowing large charging current to the battery 200 to be charged, the pre-charging circuit 30 is used for converting the dc power output by the output rectifying module 10 into small charging current and outputting the small charging current to the current to be charged, the voltage detection circuit 40 is provided at the positive electrode BAT + of the battery 200 to be charged, the MCU controller 50 switches different branches to be charged according to the voltage of the battery 200 to be charged, when the voltage of the battery 200 to be charged is less than the preset voltage, the MCU controller 50 controls the pre-charging circuit 30 to work, simultaneously the relay 20 is disconnected, the dc power output by the output rectifying module 10 is converted by the pre-charging circuit 30 and then outputs constant small charging current to the battery 200 to be, along with the charging, the voltage of the battery 200 to be charged gradually rises, when the voltage of the battery 200 to be charged reaches a preset voltage, the pre-charging needs to be switched to the fast charging, the MCU controller 50 controls the relay 20 to be closed, and at the same time, controls the pre-charging circuit 30 to stop working, the large current output by the output rectifier module 10 flows into the positive electrode BAT + of the battery 200 to be charged through the relay 20, so as to realize the fast charging, and meanwhile, the large current constant current charging circuit 70 performs constant current control on the large current flowing through the relay 20, thereby ensuring that the small charging current and the large charging current input to the battery 200 to be charged are both constant, solving the problem that the pre-charging current and the fast charging current share the same charging loop and have pre-charging constant current control failure, and improving the charging reliability.
The preset voltage may be specifically set according to the type and the charging requirement of the battery 200 to be charged, and the ratio of the small charging current to the large charging current may also be correspondingly set according to the type and the charging requirement of the battery 200 to be charged, for example, the preset voltage may be 42V, the pre-charging stage is set at 35V to 42V, the small charging current is set at 0.1A, the fast-charging stage is set at 42V to 69.7V, and the large charging current is set at 10A, and in one embodiment, the current magnitude of the large charging current is 50 to 100 times that of the small charging current.
The voltage detection circuit 40 is used for obtaining the voltage of the battery 200 to be charged and feeding back the voltage to the MCU controller 50, and the voltage detection circuit 40 may be a resistor divider circuit or a voltage transformer, which may be specifically selected according to the requirement.
The utility model discloses an adopt output rectifier module 10, relay 20, pre-charge circuit 30, voltage detection circuit 40 and MCU controller 50 to constitute high-power switching power supply circuit 100, pre-charge circuit 30 and relay 20 connect in parallel between output rectifier module 10 and waiting to charge battery 200, for waiting to charge battery 200 to provide the charging current of different current levels, when waiting to charge battery 200's voltage lower be less than the preset voltage, promptly wait that the electric quantity of charging battery 200 is less than the default, MCU controller 50 controls pre-charge circuit 30 work, pre-charge circuit 30 exports little charging current to waiting to charge battery 200, when waiting to charge battery 200's voltage to reach the preset voltage, MCU controller 50 controls relay 20 to close, output rectifier module 10 exports big charging current to waiting to charge battery 200, little charging current and big charging current are exported with different branch road respectively, the problem that pre-charging current and quick-charging current share the same charging loop and pre-charging constant current control is invalid is solved, and charging reliability of the battery 200 to be charged is improved.
As shown in fig. 2, in one embodiment, the pre-charge circuit 30 includes a small current control device 31, a switching device 32 and a unidirectional conducting device 33 electrically connected in sequence, an input terminal of the small current control device 31 is connected with an input terminal of the relay 20, and an output terminal of the unidirectional conducting device 33 is connected with an output terminal of the relay 20;
the switching device 32 is used for correspondingly switching on or switching off according to a switching control signal output by the MCU controller 50;
a small current control device 31 for performing constant current conversion on the dc power supply output by the output rectifying module 10 when the switching device 32 is turned on, and outputting a constant small charging current to the one-way conduction device 33;
and a one-way conduction device 33 for outputting the small charging current outputted from the small current control device 31 to the battery to be charged 200 in one way when the switching device 32 is turned on.
In this embodiment, the controlled end of the switching device 32 is connected to the control end of the MCU controller 50, and is correspondingly turned on or off according to the switching control signal output by the MCU controller 50, when the voltage of the battery 200 to be charged is smaller than the preset voltage, the MCU controller 50 controls the switching device 32 to be turned on, a charging loop is formed between the output rectifying module 10 and the battery 200 to be charged, the low current control device 31 performs constant current conversion on the dc power output by the output rectifying module 10 through clamping and other conversions, so as to output a constant low charging current, and the one-way conduction device 33 is used to prevent the current of the battery 200 to be charged and the current output by the relay 20 from flowing backwards.
The small current control device 31 may be a clamping diode D1, a triode, or the like, the switching device 32 may be a relay 20, a triode, a MOS transistor, or the like, and the unidirectional device 33 may be a diode D1, or the like, as shown in fig. 3, in an embodiment, the small current control device 31 includes a first resistor R1 and a clamped first PNP triode Q1, a first end of the first resistor R1, an emitter of the first PNP triode Q1, and an output end of the output rectifying module 10 are interconnected, a second end of the first resistor R1, an input end of the switching device 32, and a base of the first PNP triode Q1 are interconnected, and a collector of the first PNP triode Q1 is connected to a controlled end of the switching device 32.
The switching device 32 comprises a second resistor R2 and a second PNP triode Q2, the first end of the second resistor R2, the emitter of the second PNP triode Q2 and the output end of the small current control device 31 are connected, the second end of the second resistor R2 and the base of the second PNP triode Q2 are connected in common to form a controlled end of the switching device 32, and the collector of the second PNP triode Q2 is the output end of the switching device 32.
The unidirectional turn-on device 33 includes a diode D1, an anode of a diode D1 is connected to the second PNP transistor Q2, and a cathode of a diode D1 is connected to the positive electrode BAT + of the battery 200 to be charged.
The first resistor R1 and the first PNP triode Q1 realize constant current control, an emitter and a base in the first PNP triode Q1 form a clamping diode D1, and the voltage reduction at two ends of the first resistor R1 is clamped to about 0.7V, so that the small charging current flowing through the first resistor R1 is controlled to be constant, the small current constant current output is realized, the second PNP triode Q2 is a branch switch and is correspondingly switched on or off according to a switch control signal of the MCU controller 50, and the diode D1 is used for current backflow prevention protection.
As shown in fig. 4, in an embodiment, the precharge circuit further includes a signal conversion circuit 34, where the signal conversion circuit 34 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a capacitor C1, and an NPN transistor Q3;
a first end of the third resistor R3 is a controlled end of the precharge circuit 30, a second end of the third resistor R3, a first end of the fourth resistor R4, a first end of the capacitor C1, and a base of the NPN transistor Q3 are interconnected, a second end of the fourth resistor R4, a second end of the capacitor C1, and an emitter of the NPN transistor Q3 are all grounded, a collector of the NPN transistor Q3 is connected to a first end of the fifth resistor R5, and a second end of the fifth resistor R5 is connected to a controlled end of the switching device 32.
In this embodiment, the signal conversion circuit 34 is configured to perform signal amplification, filtering, and other processing on the switch control signal output by the MCU controller 50, where when the MCU controller 50 outputs a high level, the NPN transistor Q3 is turned on, and outputs a low level to the second PNP transistor Q2 of the switching device 32, the second PNP transistor Q2 is turned on, a charging loop is formed between the output rectifying module 10 and the battery 200 to be charged, and when the MCU controller 50 outputs a low level, the NPN transistor Q3 and the second PNP transistor Q2 are not turned on, and the precharging circuit 30 is turned off to stop precharging.
The utility model discloses still provide a power strip, this power strip includes high-power switching power supply circuit 100, and this switching power supply circuit's concrete structure refers to above-mentioned embodiment, because this power strip has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and the repeated description is no longer given here.
In this embodiment, the power panel is configured to output a large constant charging current and a small constant charging current to the battery to be charged according to the voltage of the battery to be charged, the front end of the power panel may be connected to the utility power, and perform voltage boosting and reducing, rectification and inversion and other conversions on the utility power, and the power panel may further include a voltage boosting and reducing circuit, an inverter circuit, a filter circuit, a lightning protection circuit and other structures, and the specific structure is not limited.
The above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A high-power switch power supply circuit is characterized by comprising an output rectifying module and a relay, wherein the input end of the relay is connected with the output end of the output rectifying module, and the output end of the relay is connected with the anode of a battery to be charged;
the high-power switching power supply circuit further comprises: the pre-charging circuit is connected with the relay in parallel, the voltage detection circuit is connected with the anode of the battery to be charged, and the MCU controller is connected with the voltage detection circuit;
the MCU controller is used for controlling the pre-charging circuit to work and controlling the relay to be switched off when the voltage of the battery to be charged is smaller than a preset voltage; and
and when the voltage of the battery to be charged is not less than the preset voltage, controlling the pre-charging circuit to stop working and controlling the relay to be closed.
2. The high power switching power supply circuit according to claim 1, wherein the pre-charge circuit comprises a small current control device, a switching device and a one-way conduction device electrically connected in sequence, an input terminal of the small current control device is connected with an input terminal of the relay, and an output terminal of the one-way conduction device is connected with an output terminal of the relay;
the switching device is used for correspondingly switching on or switching off according to the switching control signal output by the MCU controller;
the small current control device is used for performing constant current conversion on the direct current power supply output by the output rectifying module when the switching device is switched on and outputting constant small charging current to the one-way switching device;
and the unidirectional conducting device is used for unidirectionally outputting the small charging current output by the small current control device to the battery to be charged when the switching device is conducted.
3. The high power switching power supply circuit according to claim 2, wherein said low current control device comprises a first resistor and a clamped first PNP transistor;
the first end of the first resistor, the emitting electrode of the first PNP triode and the output end of the output rectifying module are interconnected, the second end of the first resistor, the input end of the switch device and the base electrode of the first PNP triode are interconnected, and the collecting electrode of the first PNP triode is connected with the controlled end of the switch device.
4. The high power switching power supply circuit according to claim 2, wherein said switching device comprises a second resistor and a second PNP transistor;
the first end of the second resistor, the emitting electrode of the second PNP triode and the output end of the small current control device are connected, the second end of the second resistor and the base electrode of the second PNP triode are connected in common to form the controlled end of the switch device, and the collector electrode of the second PNP triode is the output end of the switch device.
5. The high power switching power supply circuit according to claim 2, wherein the pre-charge circuit further comprises a signal conversion circuit, the signal conversion circuit comprises a third resistor, a fourth resistor, a fifth resistor, a capacitor and an NPN transistor;
the first end of the third resistor is a controlled end of the pre-charging circuit, the second end of the third resistor, the first end of the fourth resistor, the first end of the capacitor and the base electrode of the NPN triode are interconnected, the second end of the fourth resistor, the second end of the capacitor and the emitter electrode of the NPN triode are all grounded, the collector electrode of the NPN triode is connected with the first end of the fifth resistor, and the second end of the fifth resistor is connected with the controlled end of the switching device.
6. The high power switching power supply circuit according to claim 2, wherein the high power switching power supply circuit further comprises a transformer and a sampling resistor, one end of a secondary coil of the transformer is connected to the output rectifying module, and the other end of the secondary coil of the transformer is grounded;
the first end of the sampling resistor is connected with the negative electrode of the battery to be charged, and the second end of the sampling resistor is grounded.
7. The high power switching power supply circuit according to claim 6, wherein the high power switching power supply circuit further comprises a large current constant current charging circuit, the large current constant current charging circuit is connected with the first end of the sampling resistor, and the large current constant current charging circuit comprises a signal amplifying circuit and a constant current control circuit;
the signal amplification circuit is used for carrying out signal amplification conversion on the voltage of the sampling resistor and feeding back the voltage to the constant current control circuit;
and the constant current control circuit is used for controlling the large charging current flowing through the relay to be constant according to the amplified voltage of the sampling resistor and the reference voltage.
8. The high power switching power supply circuit according to claim 7, wherein the constant current control circuit comprises an operational amplifier, a non-inverting input terminal of the operational amplifier is connected to the reference voltage, and an inverting input terminal of the operational amplifier is connected to the amplified voltage of the sampling resistor.
9. The high power switching power supply circuit according to claim 7, wherein the magnitude of the large charging current is 50 to 100 times the magnitude of the small charging current.
10. A power panel comprising the high power switching power supply circuit according to any one of claims 1 to 9.
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| CN202021270659.6U CN212751824U (en) | 2020-07-01 | 2020-07-01 | High-power switching power supply circuit and power supply board |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114448062A (en) * | 2022-04-11 | 2022-05-06 | 深圳市思远半导体有限公司 | Charging circuit, charging chip and charging control method of portable equipment |
| CN114594748A (en) * | 2022-02-21 | 2022-06-07 | 深圳市道通科技股份有限公司 | Test equipment, diagnostic equipment and automobile diagnostic system |
| CN114604109A (en) * | 2022-04-07 | 2022-06-10 | 中国第一汽车股份有限公司 | Pre-charging device, system and pre-charging control method |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114594748A (en) * | 2022-02-21 | 2022-06-07 | 深圳市道通科技股份有限公司 | Test equipment, diagnostic equipment and automobile diagnostic system |
| CN114604109A (en) * | 2022-04-07 | 2022-06-10 | 中国第一汽车股份有限公司 | Pre-charging device, system and pre-charging control method |
| CN114604109B (en) * | 2022-04-07 | 2024-03-19 | 中国第一汽车股份有限公司 | Precharge device, precharge system, and precharge control method |
| CN114448062A (en) * | 2022-04-11 | 2022-05-06 | 深圳市思远半导体有限公司 | Charging circuit, charging chip and charging control method of portable equipment |
| CN114448062B (en) * | 2022-04-11 | 2022-07-22 | 深圳市思远半导体有限公司 | Charging circuit, charging chip and charging control method of portable equipment |
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