CN217215967U - Surge protection circuit, power supply system and unmanned vehicle - Google Patents
Surge protection circuit, power supply system and unmanned vehicle Download PDFInfo
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- CN217215967U CN217215967U CN202220554661.9U CN202220554661U CN217215967U CN 217215967 U CN217215967 U CN 217215967U CN 202220554661 U CN202220554661 U CN 202220554661U CN 217215967 U CN217215967 U CN 217215967U
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Abstract
The embodiment of the utility model discloses a surge protection circuit, a power supply system and an unmanned vehicle, wherein the input end of a switch module in the surge protection circuit is connected with the input end of a bus, and the output end of the switch module is connected with the output end of the bus; the first energy storage peak suppression module is connected with the output end of the switch module, the surge voltage detection module is respectively connected with the bus input end, the output end of the switch module is connected with the switch module, the first energy storage peak suppression module stores electric energy and suppresses surge peak voltage in a power bus when the switch module is switched on, and outputs electric energy to the bus output end when the switch module is switched off, the surge voltage detection module acquires reference voltage from the bus input end, the switch module is driven to be switched off when the bus voltage at the output end of the switch module is greater than the reference voltage, and the switch module is driven to be switched on when the bus voltage is smaller than the reference voltage after the switch module is switched off, electric energy is continuously output at the bus output end when surge voltage is generated, and high-capacity capacitors are not needed, and the cost is low.
Description
Technical Field
The embodiment of the utility model provides a relate to circuit technical field, especially relate to a surge protection circuit, power supply system and unmanned car.
Background
The unmanned vehicle is usually driven by a high-power motor, the motor is powered by a power bus, and because the motor is an inductive load, the motor is easy to generate surge high voltage with the duration of more than 1 second, and when the surge high voltage is superposed on the power bus, components with low withstand voltage supplied by the power bus are damaged.
At present, a surge protection circuit is mainly arranged in a power bus so as to disconnect components with lower withstand voltage from the power bus when detecting surge high voltage, and restore the connection between the components with lower withstand voltage and the power bus when detecting the end of the surge high voltage.
However, when the duration of the surge high voltage is long, the conventional surge protection circuit cannot continuously supply power to the components with low withstand voltage.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an aim at: the utility model provides a surge protection circuit, power supply system and unmanned car to solve the problem that the power supply system who is provided with surge protection circuit among the prior art can't realize continuously supplying power.
To achieve the purpose, the embodiment of the present invention adopts the following technical solutions:
in a first aspect, a surge protection circuit is provided, including:
the input end of the switch module is connected with the bus input end of a power bus, and the output end of the switch module is connected with the bus output end of the power bus;
the first energy storage peak suppression module is connected with the output end of the switch module and used for storing electric energy and suppressing surge peak voltage in a power supply bus when the switch module is switched on and outputting the electric energy to the bus output end when the switch module is switched off;
surge voltage detection module, surge voltage detection module respectively with the bus input end the output of switch module and switch module connects, surge voltage detection module is used for following the bus input end acquires reference voltage, and the bus voltage of switch module's output is greater than drive during the reference voltage switch module ends, and after switch module ends the bus voltage of switch module's output is less than drive during the reference voltage switch module switches on.
Optionally, the system further comprises a second energy storage peak suppression module, and the second energy storage peak suppression module is connected with the input end of the bus.
Optionally, the surge voltage detection module includes a reference voltage unit, a voltage sampling unit and a comparator, an input of the reference voltage unit is connected to the bus input terminal, an output of the reference voltage unit is connected to a positive input terminal of the comparator, an input of the voltage sampling unit is connected to an output of the switch module, an output of the voltage sampling unit is connected to a negative input terminal of the comparator, an output of the comparator is connected to the switch module, the reference voltage unit is used for acquiring the reference voltage from the bus input terminal, and the voltage sampling unit is used for acquiring the bus voltage from an output of the switch module.
Optionally, the reference voltage unit includes a first resistor and a first zener diode, one end of the first resistor is connected to the bus input terminal, the other end of the first resistor is connected to the cathode of the first zener diode, the anode of the first zener diode is grounded, and a common node formed by the first resistor and the first zener diode is connected to the positive input terminal of the comparator.
Optionally, the voltage sampling unit includes a second resistor and a third resistor, one end of the second resistor is connected to the output terminal of the switch module, the other end of the second resistor is grounded through the third resistor, and a common node of the second resistor and the third resistor is connected to the inverting input terminal of the comparator.
Optionally, the switch module includes a first triode and a field effect transistor, a source electrode of the field effect transistor serves as an input end of the switch module and is connected with the bus input end, a drain electrode of the field effect transistor serves as an output end of the switch module and is connected with the bus output end, a base electrode of the first triode is connected with the surge voltage detection module through a fourth resistor, a collector electrode of the first triode is connected with the source electrode of the field effect transistor sequentially through a fifth resistor and a sixth resistor, an emitter electrode of the first triode is grounded, and a common node of the fifth resistor and the sixth resistor is connected with a gate electrode of the field effect transistor.
Optionally, the switch module further includes a second triode, a second voltage regulator diode, and a first diode, a collector of the second triode is connected to the source of the field effect transistor, an emitter of the second triode is connected to the gate of the field effect transistor, a common node formed by the emitter of the second triode and the gate of the field effect transistor is connected to an anode of the first diode, a cathode of the first diode is connected to a common node of the fifth resistor and the sixth resistor, a base of the second triode is connected to a common node of the fifth resistor and the sixth resistor through a seventh resistor, the common node of the fifth resistor and the sixth resistor is further connected to an anode of the second voltage regulator diode, and a cathode of the second voltage regulator diode is connected to the source of the field effect transistor.
Optionally, the first energy storage peak suppression module includes an inductor and at least one energy storage capacitor, the inductor is connected in series between the output end of the switch module and the bus output end, and one end of the inductor connected to the bus output end is grounded through the energy storage capacitor.
In a second aspect, a power supply system is provided, where the power supply system includes a power supply, an emergency stop switch, an inductive load, a post-stage load, and the surge protection circuit according to any one of the first aspect, the inductive load and the post-stage load are connected in parallel to a power bus of the power supply, a switch module of the surge protection circuit is disposed in the power bus between the inductive load and the post-stage load, a common node of the inductive load and the power bus serves as a bus input end of the surge protection circuit, a common node of the post-stage load and the power bus serves as a bus output end of the surge protection circuit, and the emergency stop switch is disposed in the power bus between the inductive load and the power supply.
In a third aspect, an unmanned vehicle is provided, which comprises the power supply system of the second aspect.
In the surge protection circuit of the embodiment of the utility model, the surge voltage detection module is respectively connected with the bus input end, the output end of the switch module and the switch module, the surge voltage detection module acquires the reference voltage from the bus input end and acquires the bus voltage from the output end of the switch module, and drives the switch module to be cut off when the bus voltage of the output end of the switch module is greater than the reference voltage, the first energy storage peak suppression module outputs electric energy to the output end of the power bus, and drives the switch module to be switched on when the bus voltage of the output end of the switch module is less than the reference voltage after the switch module is cut off, the first energy storage peak suppression module stores electric energy and suppresses the surge peak voltage, the switch module is not required to be driven to be switched on after the surge voltage is ended, thereby realizing that the switch module can be repeatedly driven to be switched on and cut off when the surge voltage lasts for a long time, on the one hand, under the effect that surge peak voltage and discharge are suppressed to first energy storage peak suppression module, can continuously output the electric energy at the generating line output end when producing surge voltage in the power supply bus, on the other hand, first energy storage peak suppression module need not to adopt high capacity electric capacity, and is with low costs.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Fig. 1 is a block diagram of a surge protection circuit according to an embodiment of the present invention;
fig. 2 is a block diagram of a surge protection circuit according to another embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a surge protection circuit according to an embodiment of the present invention;
fig. 4 is a block diagram of a power supply system according to an embodiment of the present invention;
in the figure:
10. a switch module; 20. a surge voltage detection module; 30. a first energy storage peak suppression module; 40. a second energy storage peak suppression module; 100. a surge protection circuit; 200. a power source; 300. an inductive load; 400. a rear stage load; 500. and (4) an emergency stop switch.
Detailed Description
In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the following will combine the accompanying drawings to describe the technical solution of the embodiments of the present invention in further detail.
Example one
Fig. 1 is the utility model provides a surge protection circuit's block diagram, as shown IN fig. 1, this surge protection circuit can avoid surge voltage to export the generating line output end VBAT _ OUT of power bus when the surge voltage of the generating line input end VBAT _ IN input of power bus to make the back stage load of connecting after generating line output end VBAT _ OUT not receive surge voltage to strike and damage, specifically, this surge protection circuit includes switch module 10, surge voltage detection module 20 and first energy storage peak suppression module 30.
The switch module 10 may be a module that is controlled to be turned on or off, such as a switch circuit including an electronic switch, such as a field effect transistor or a transistor, the switch module 10 may be provided with an input end, an output end and a control end, the input end of the switch module 10 is connected to a bus input end VBAT _ IN of the power bus, the output end of the switch module 10 is connected to a bus output end VBAT _ OUT of the power bus, when the switch module 10 is turned on, the bus input end VBAT _ IN and the bus output end VBAT _ OUT are turned on, and when the switch module 10 is turned off, the bus input end VBAT _ IN and the bus output end VBAT _ OUT are turned off.
The first energy storage peak suppressing module 30 may be a module for storing electric energy and suppressing a rapid change in voltage, for example, an LC circuit composed of an inductor and a capacitor, to suppress a surge peak voltage through the inductor and store and release electric energy through the capacitor, and the first energy storage peak suppressing module 30 is connected to the output terminal of the switch module 10, and is configured to store electric energy and suppress a surge peak voltage in the power bus when the switch module 10 is turned on, and output electric energy to the bus output terminal VBAT _ OUT when the switch module 10 is turned off.
The surge voltage detection module 20 may be a module for detecting a surge voltage IN the power bus and controlling the switch module 10 to be turned on or off according to a detection result, the surge voltage detection module 20 may be respectively connected to the bus input terminal VBAT _ IN, the output terminal of the switch module 10, and the switch module 10, for example, as shown IN fig. 1, the surge voltage detection module 20 may include a first input terminal IN1, a second input terminal IN2, and a signal output terminal out, the first input terminal IN1 is connected to the bus input terminal VBAT _ IN, the second input terminal IN2 is connected to the output terminal of the switch module 10, the signal output terminal out is connected to the control terminal ctl of the switch module 10, the surge voltage detection module 20 is configured to obtain a reference voltage from the bus input terminal VBAT _ IN and drive the switch module 10 to be turned off when the bus voltage at the output terminal of the switch module 10 is greater than the reference voltage, and after the switch module 10 is turned off, when the bus voltage at the output end of the switch module 10 is smaller than the reference voltage, the switch module 10 is driven to be conducted.
The utility model discloses surge protection circuit's theory of operation as follows:
the first input end IN1 of the surge voltage detection module 20 obtains a reference voltage from the bus input end VBAT _ IN, the reference voltage is a voltage converted by the minimum withstand voltage of a load connected behind the bus output end VBAT _ OUT, the second input end IN2 collects a bus voltage from the output end of the switch module 10, when there is no surge high voltage at the bus input end VBAT _ IN, the switch module 10 is IN a normally on state, the first energy storage peak suppression module 30 stores electric energy, when the bus voltage input from the second input end IN2 is greater than the reference voltage, it is indicated that there is a surge high voltage at the bus input end VBAT _ IN, the signal output end OUT of the surge voltage detection module 20 outputs a driving signal to drive the switch module 10 to be turned off, the first energy storage peak suppression module 30 outputs electric energy to the bus output end VBAT _ OUT, and the voltage at the output end of the switch module 10 slowly drops, so that the bus voltage input from the second input end IN2 gradually approaches the reference voltage, when the bus voltage is less than the reference voltage, the signal output terminal out of the surge voltage detection module 20 outputs a driving signal to drive the switch module 10 to be turned on, even if the bus input terminal VBAT _ IN still has the surge high voltage, under the suppression of the first energy storage peak suppression module 30 to the surge peak voltage, the voltage at the output terminal of the switch module 10 slowly rises, the first energy storage peak suppression module 30 stores the electric energy, when the voltage at the output terminal of the switch module 10 is greater than the reference voltage, the signal output terminal out of the surge voltage detection module 20 outputs a driving signal to turn off the switch module 10, so as to repeatedly control the switch module 10 to be turned on and off, therefore, the electric energy is continuously output from the bus output end VBAT _ OUT, the switch module is not required to be driven to be switched from off to on after the surge voltage is finished, the requirement on the energy storage capacity of the first energy storage peak suppression module 30 is low, and the circuit cost is reduced.
As shown IN fig. 2, IN an optional embodiment, the energy storage peak suppression module 40 is further included, the second energy storage peak suppression module 40 is connected to the bus bar input end VBAT _ IN, and the second energy storage peak suppression module 40 may have a circuit structure the same as that of the first energy storage peak suppression module 30, and is configured to absorb and suppress the short-duration surge peak voltage before the surge voltage detection module 20, so as to avoid frequent turning on and off of the switch module 10 caused by the short-duration surge peak voltage, and ensure that the bus bar output end VBAT _ OUT outputs electric energy normally and continuously.
In order to make the person skilled in the art understand the surge protection circuit of the embodiment of the present invention more clearly, the operation principle of the surge protection circuit is described below with reference to the circuit schematic diagram shown in fig. 3.
The utility model discloses an IN an example, surge voltage detection module 20 can include the reference voltage unit, voltage sampling unit and comparator, wherein, the input and the bus bar input end VBAT _ IN of reference voltage unit are connected, the output of reference voltage unit is connected with the normal phase input of comparator, the input of voltage sampling unit is connected with switch module 10's output, the output and the reverse phase input of comparator of voltage sampling unit are connected, the output and the switch module 10 of comparator are connected, the reference voltage unit is used for obtaining reference voltage from bus bar input end VBAT _ IN, the voltage sampling unit is used for obtaining bus bar voltage from switch module 10's output.
As shown IN fig. 3, IN the surge voltage detection module 20, the reference voltage unit includes a first resistor R1 and a first zener diode ZD1, one end of the first resistor R1 is connected to the bus bar input terminal VBAT _ IN, preferably, one end of the first resistor R1 is connected to the bus bar input terminal VBAT _ IN through a second diode D2 provided on the power bus bar, so that the negative pulse high voltage generated by the inductive load is prevented from entering the circuit from the bus bar input terminal VBAT _ IN by the second diode D2, the other end of the first resistor R1 is connected with the cathode of the first zener diode ZD1, the anode of the first zener diode ZD1 is grounded, the common node formed by the first resistor R1 and the first zener diode ZD1 is connected with the non-inverting input terminal of the comparator U1, the first resistor R1 is used for dividing voltage, and the first zener diode ZD1 is used for clamping the voltage at the non-inverting input terminal of the comparator U1 at the reference voltage.
As shown in fig. 3, the voltage sampling unit includes a second resistor R2 and a third resistor R3, one end of the second resistor R2 is connected to the output terminal VBAT _ Q of the switch module 10, the other end is grounded through the third resistor R3, and a common node of the second resistor R2 and the third resistor R3 is connected to an inverting input terminal of the comparator U1.
The switch module 10 comprises a field effect transistor Q1 and a first triode Q2, a source s of the field effect transistor Q1 is used as an input end of the switch module 10 and is connected with a bus input end VBAT _ IN, a drain d of the field effect transistor Q1 is used as an output end of the switch module 10 and is connected with a bus output end VBAT _ OUT, a base of the first triode Q2 is connected with an output end of a comparator U1 IN the surge voltage detection module 20 through a fourth resistor R4, a collector of the first triode Q2 is connected with the source s of the field effect transistor Q1 through a fifth resistor R5 and a sixth resistor R6 IN sequence, an emitter of the first triode Q2 is grounded, and a common node of the fifth resistor R5 and the sixth resistor R6 is connected with a gate of the field effect transistor Q1.
In an alternative embodiment, the switching module 10 further includes a second triode Q3, a second zener diode ZD2, and a first diode D1, a collector of the second triode Q3 is connected to the source s of the fet Q1, an emitter of the second triode Q3 is connected to the gate g of the fet Q1, a common node formed by the emitter of the second triode Q3 and the gate g of the fet Q1 is connected to the anode of the first diode D1, a cathode of the first diode D1 is connected to a common node of the fifth resistor R5 and the sixth resistor R6, a base of the second triode Q2 is connected to a common node of the fifth resistor R5 and the sixth resistor R6 through a seventh resistor R7, the common node of the fifth resistor R5 and the sixth resistor R6 is further connected to the anode of the second zener diode ZD2, and a cathode of the second zener diode 2 is connected to the source s of the fet Q1.
In the utility model discloses a another optional embodiment, first energy storage peak suppression module 30 includes inductance L and at least one energy storage electric capacity (C2, C3, C4), and inductance L establishes ties between output VBAT _ Q and generating line output end VBAT _ OUT of switch module 10, and inductance L passes through energy storage electric capacity ground connection with the one end that generating line output end VBAT _ OUT is connected, it can be one or more to need to explain energy storage electric capacity's quantity, when energy storage electric capacity's quantity is greater than 1, a plurality of energy storage electric capacity are parallelly connected.
Of course, the first energy storage peak suppression module 30 may also be a TVS (Transient Voltage Suppressor) connected between the power bus and the power ground, and under the condition that a device in the surge protection circuit adopts a high-speed device (response reaches nanosecond level), the first energy storage peak suppression module 30 may adopt a TVS, and can effectively clamp the power bus Voltage at a preset Voltage, thereby protecting a load behind the bus output end VBAT _ OUT.
The working principle of the surge protection circuit shown in fig. 3 is as follows:
under normal surge-free conditions, the fet Q1 is in a conducting state, the voltage at the positive input terminal of the comparator U1 is clamped to the clamping voltage of the first zener diode, i.e., the reference voltage, which is a voltage converted by the minimum breakdown voltage of the load connected after the bus output terminal VBAT _ OUT, and may be 2.5V as an example, the voltage at the output terminal VBAT _ Q of the switching module 10 is divided by the second resistor R2 and the third resistor R3 and then input to the negative input terminal of the comparator U1 as the bus voltage, when there is no surge voltage, the voltage at the negative input terminal of the comparator U1 is smaller than the voltage at the positive input terminal, the comparator U1 outputs a high-level driving signal to the base of the first transistor Q2, the first transistor Q2 is conducting, the gate g of the fet Q1 is pulled down to the ground by the first diode D1 and the fifth resistor R5, and the fet Q1 is conducting, the second zener diode ZD2 clamps the voltage between the source s and the gate g of the fet Q1 to the clamping voltage of the second zener diode ZD2 to protect the fet Q1, and at the same time, the capacitors (C2, C3, C4) in the first energy storage peak suppression module 30 store electrical energy.
When surge voltage exists, the voltage of the output end VBAT _ Q of the switch module 10 is divided by the second resistor R2 and the third resistor R3 and then is input to the negative phase input end of the comparator U1 as bus voltage, the voltage of the negative phase input end of the comparator U1 is greater than the voltage of the positive phase input end, the comparator U1 outputs a low-level driving signal to the base of the first triode Q2, the first triode Q2 is turned off, the base of the second triode Q3 is connected to the power bus via the seventh resistor R7 and the sixth resistor R6, the base of the second triode Q3 is high, the second triode Q3 is turned on, the gate g of the field-effect transistor Q1 is connected to the power bus, negative charge of the gate g of the field-effect transistor Q1 is rapidly consumed, the gate g of the gate Q1 is at high level, the field-effect transistor Q1 is turned off, and the capacitors (C2, C3, C4) in the first energy storage peak suppressing module 30 output electric energy to the bus output end VBAT _ OUT, since the fet Q1 is turned off, as the capacitors (C2, C3, C4) output power to the bus output terminal VBAT _ OUT, the voltage of the output terminal VBAT _ Q of the switch module 10 decreases, when the voltage of the output terminal VBAT _ Q of the switch module 10 decreases and causes the voltage of the negative phase input terminal of the comparator U1 to be less than the voltage of the positive phase input terminal, the comparator U1 outputs a high level signal to control the fet Q1 to be turned on, under the energy storage effect of the inductor L suppression and the capacitors (C2, C3, C4) in the first energy storage peak suppression module 30, the voltage of the output terminal VBAT _ Q of the switch module 10 increases, and when the voltage of the output terminal VBAT _ Q of the switch module 10 increases and causes the voltage of the negative phase input terminal of the comparator U1 to be greater than the voltage of the positive phase input terminal, the comparator U1 outputs a low level signal to control the fet Q1, so as to repeatedly control the fet Q1 to be turned off when there is a surge voltage, And the bus output end VBAT _ OUT continuously outputs safe voltage, so that the problems that the field effect transistor Q1 is controlled to be switched on after surge voltage is ended, no voltage is output from the bus output end VBAT _ OUT due to the fact that the electric energy of the first energy storage peak suppression module 30 is exhausted, or cost is increased due to the fact that the first energy storage peak suppression module 30 with high capacity is needed are solved.
In the surge protection circuit of the embodiment of the utility model, the surge voltage detection module is respectively connected with the bus input end, the output end of the switch module and the switch module, the surge voltage detection module acquires the reference voltage from the bus input end and acquires the bus voltage from the output end of the switch module, and drives the switch module to be cut off when the bus voltage of the output end of the switch module is greater than the reference voltage, the first energy storage peak suppression module outputs electric energy to the output end of the power bus, and drives the switch module to be switched on when the bus voltage of the output end of the switch module is less than the reference voltage after the switch module is cut off, the first energy storage peak suppression module stores electric energy and suppresses the surge peak voltage, the switch module is not required to be driven to be switched on after the surge voltage is ended, thereby realizing that the switch module can be repeatedly driven to be switched on and cut off when the surge voltage lasts for a long time, on the one hand, under surge peak voltage and discharge action are suppressed to first energy storage peak suppression module, the generating line output of power bus keeps outputting electric energy, and on the other hand, first energy storage peak suppression module need not to adopt high capacity electric capacity, and is with low costs.
Example two
Fig. 4 is a schematic diagram of a power supply system according to an embodiment of the present invention, which includes a surge protection circuit 100, a power supply 200, an inductive load 300, a post-stage load 400, and an emergency stop switch 500 provided in the first embodiment.
The power supply 200 may be a battery or other DC power supply, the inductive load 300 may be a load with inductive parameters, such as a transformer, a motor, and the like, provided with a coil, and the rear-stage load 400 may be a device with a low voltage withstanding value and easy to be impacted by surge voltage, such as a DC-DC module, an electrical regulation module, and the like.
As shown IN fig. 4, the inductive load 300 and the post-load 400 are connected IN parallel to a power bus of the power supply 200, the switch module 10 of the surge protection circuit 100 is disposed IN the power bus between the inductive load 300 and the post-load 400, a common node between the inductive load 300 and the power bus is used as a bus input terminal VBAT _ IN of the surge protection circuit 100, a common node between the post-load 400 and the power bus is used as a bus output terminal VBAT _ OUT of the surge protection circuit 100, and the emergency stop switch 500 is disposed IN the power bus between the inductive load 300 and the power supply 200.
As shown IN fig. 4, an inductive load 300 is taken as an example of a motor, when the motor is suddenly stopped during operation, a coil of the motor generates a reverse surge high voltage with a duration exceeding microseconds, or the motor continues to operate due to inertia of equipment after the motor is powered off, or the motor is subjected to an external force after the motor is powered off, the motor generates a surge high voltage with a duration exceeding 1 second, and IN addition, when an emergency stop switch 500 IN a power supply system is turned off, an electric arc is generated at the moment, the surge high voltage also generates a surge high voltage, and the surge high voltage enters a bus input terminal VBAT _ IN.
Because the utility model discloses be provided with the surge protection circuit 100 that embodiment one provided in the power supply system of embodiment, in this surge protection circuit, surge voltage detection module respectively with the bus input end, switch module's output and switch module are connected, surge voltage detection module acquires reference voltage from the bus input end and gathers bus voltage from switch module's output, and drive switch module and end when switch module's output bus voltage is greater than reference voltage, output electric energy to power bus by first energy storage peak suppression module, and after switch module ends, drive switch module and switch on when switch module's output bus voltage is less than reference voltage, first energy storage peak suppression module stores electric energy and suppresses surge peak voltage, need not to wait to drive switch module and switch on after surge voltage ends, it can drive switch module and switch on to have realized that surge voltage duration is too long repeatedly to drive switch module and switch on, And on one hand, under the action that the first energy storage peak suppression module suppresses surge peak voltage and discharges, the bus output end of the power bus continuously outputs electric energy, and on the other hand, the first energy storage peak suppression module does not need to adopt a high-capacity capacitor and is low in cost.
EXAMPLE III
The embodiment of the utility model provides an unmanned vehicle, this unmanned vehicle include embodiment two's power supply system, and in this power supply system, power 200 is the battery of unmanned vehicle, and perceptual load 300 is the wheel of driving unmanned vehicle in the unmanned vehicle or other actuating mechanism's motor, and back level load 400 is the electron device that withstand voltage value is low on the unmanned vehicle, like DC-DC module, host system etc..
The utility model discloses unmanned car is provided with the power supply system of embodiment two, this power supply system can be when surge voltage exists in power bus the bus bar output electric energy that lasts, the surge voltage that has avoided the motor of unmanned car to produce causes the bus bar output to stop to export the electric energy and causes the problem that unmanned car restarted, it can normal operating to have guaranteed unmanned car when producing surge voltage, in addition, the peak module need not to adopt high capacity electric capacity to hold down in the energy storage among the power supply system, and is low in cost, the cost of unmanned car has been reduced.
Claims (10)
1. A surge protection circuit, comprising:
the input end of the switch module is connected with the bus input end of a power bus, and the output end of the switch module is connected with the bus output end of the power bus;
the first energy storage peak suppression module is connected with the output end of the switch module and used for storing electric energy and suppressing surge peak voltage in a power supply bus when the switch module is switched on and outputting the electric energy to the bus output end when the switch module is switched off;
surge voltage detection module, surge voltage detection module respectively with the bus input the output of switch module and switch module connects, surge voltage detection module is used for following the bus input acquires reference voltage, and the bus voltage of switch module's output is greater than drive during the reference voltage switch module ends, and switch module ends the back the bus voltage of switch module's output is less than drive during the reference voltage switch module switches on.
2. The surge protection circuit of claim 1, further comprising a second energy storage peak suppression module, the second energy storage peak suppression module connected to the bus input.
3. The surge protection circuit according to claim 1, wherein the surge voltage detection module comprises a reference voltage unit, a voltage sampling unit and a comparator, an input terminal of the reference voltage unit is connected to the bus input terminal, an output terminal of the reference voltage unit is connected to a non-inverting input terminal of the comparator, an input terminal of the voltage sampling unit is connected to an output terminal of the switch module, an output terminal of the voltage sampling unit is connected to an inverting input terminal of the comparator, an output terminal of the comparator is connected to the switch module, the reference voltage unit is configured to obtain the reference voltage from the bus input terminal, and the voltage sampling unit is configured to obtain a bus voltage from the output terminal of the switch module.
4. The surge protection circuit according to claim 3, wherein said reference voltage unit comprises a first resistor and a first zener diode, one end of said first resistor is connected to said bus input terminal, the other end of said first resistor is connected to the cathode of said first zener diode, the anode of said first zener diode is grounded, and the common node formed by said first resistor and said first zener diode is connected to the non-inverting input terminal of said comparator.
5. The surge protection circuit according to claim 3, wherein said voltage sampling unit comprises a second resistor and a third resistor, one end of said second resistor is connected to an output terminal of said switching module, the other end is grounded through said third resistor, and a common node of said second resistor and said third resistor is connected to an inverting input terminal of said comparator.
6. The surge protection circuit according to any of claims 1 to 5, wherein the switch module comprises a first transistor and a field effect transistor, a source of the field effect transistor is connected to the bus input as an input of the switch module, a drain of the field effect transistor is connected to the bus output as an output of the switch module, a base of the first transistor is connected to the surge voltage detection module through a fourth resistor, a collector of the first transistor is connected to the source of the field effect transistor through a fifth resistor and a sixth resistor in sequence, an emitter of the first transistor is grounded, and a common node of the fifth resistor and the sixth resistor is connected to a gate of the field effect transistor.
7. The surge protection circuit of claim 6, wherein said switching module further comprises a second transistor, a second zener diode, and a first diode, the collector of the second triode is connected with the source electrode of the field effect tube, the emitter of the second triode is connected with the grid electrode of the field effect tube, the common node formed by the emitter of the second triode and the grid of the field effect transistor is connected with the anode of the first diode, a cathode of the first diode is connected to a common node of the fifth resistor and the sixth resistor, the base electrode of the second triode is connected to the common node of the fifth resistor and the sixth resistor through a seventh resistor, and the common node of the fifth resistor and the sixth resistor is also connected with the anode of the second voltage-stabilizing diode, and the cathode of the second voltage-stabilizing diode is connected with the source electrode of the field effect transistor.
8. The surge protection circuit according to any of claims 1-5, wherein said first energy storage peak suppression module comprises an inductor and at least one energy storage capacitor, said inductor is connected in series between an output terminal of said switch module and said bus bar output terminal, and one end of said inductor connected to said bus bar output terminal is grounded through said energy storage capacitor.
9. A power supply system, comprising a power supply, an emergency stop switch, an inductive load, a post load, and the surge protection circuit according to any of claims 1-8, wherein the inductive load and the post load are connected in parallel to a power bus of the power supply, the switch module of the surge protection circuit is disposed in the power bus between the inductive load and the post load, a common node of the inductive load and the power bus serves as a bus input of the surge protection circuit, a common node of the post load and the power bus serves as a bus output of the surge protection circuit, and the emergency stop switch is disposed in the power bus between the inductive load and the power supply.
10. An unmanned vehicle, characterized in that the unmanned vehicle comprises the power supply system of claim 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220554661.9U CN217215967U (en) | 2022-03-14 | 2022-03-14 | Surge protection circuit, power supply system and unmanned vehicle |
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| CN202220554661.9U CN217215967U (en) | 2022-03-14 | 2022-03-14 | Surge protection circuit, power supply system and unmanned vehicle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116054115A (en) * | 2023-03-31 | 2023-05-02 | 成都新欣神风电子科技有限公司 | Surge voltage suppression and reverse connection prevention circuit |
| CN116298442A (en) * | 2023-05-11 | 2023-06-23 | 广州信位通讯科技有限公司 | Protection circuit and test method of intelligent watch main board test fixture |
-
2022
- 2022-03-14 CN CN202220554661.9U patent/CN217215967U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116054115A (en) * | 2023-03-31 | 2023-05-02 | 成都新欣神风电子科技有限公司 | Surge voltage suppression and reverse connection prevention circuit |
| CN116054115B (en) * | 2023-03-31 | 2023-10-03 | 成都新欣神风电子科技有限公司 | Surge voltage suppression and reverse connection prevention circuit |
| CN116298442A (en) * | 2023-05-11 | 2023-06-23 | 广州信位通讯科技有限公司 | Protection circuit and test method of intelligent watch main board test fixture |
| CN116298442B (en) * | 2023-05-11 | 2023-07-28 | 广州信位通讯科技有限公司 | Protection circuit and test method of intelligent watch main board test fixture |
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