CN117674010A - Power supply circuit and laser radar - Google Patents

Power supply circuit and laser radar Download PDF

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Publication number
CN117674010A
CN117674010A CN202211049923.7A CN202211049923A CN117674010A CN 117674010 A CN117674010 A CN 117674010A CN 202211049923 A CN202211049923 A CN 202211049923A CN 117674010 A CN117674010 A CN 117674010A
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CN
China
Prior art keywords
power supply
controlled switch
supply circuit
voltage
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211049923.7A
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Chinese (zh)
Inventor
李永亮
夏冰冰
石拓
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Suzhou Yijing Technology Co ltd
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Suzhou Yijing Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Suzhou Yijing Technology Co ltd filed Critical Suzhou Yijing Technology Co ltd
Priority to CN202211049923.7A priority Critical patent/CN117674010A/en
Publication of CN117674010A publication Critical patent/CN117674010A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/88—Lidar systems specially adapted for specific applications
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Electromagnetism (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

The application provides a power supply circuit and laser radar, include: a detection circuit for detecting a power supply voltage of the power supply circuit; the first controlled switch is connected between the input end and the output end of the power supply circuit; the control circuit is respectively connected with the detection circuit and the control end of the first controlled switch and is used for controlling the on or off of the first controlled switch according to the power supply voltage; the first controlled switch is conducted, and the power supply circuit supplies power through a channel conducted by the first controlled switch; the first controlled switch is opened and the power supply circuit is powered by a parasitic diode of the first controlled switch. In the present application, the ripple of the voltage output from the dc power supply can be reduced by the power supply circuit.

Description

Power supply circuit and laser radar
Technical Field
The application relates to the technical field of circuits, in particular to a power supply circuit and a laser radar.
Background
At present, some electronic devices used in production or life can only be powered by a direct current power supply system, however, when the direct current power supply system is used for powering all the electronic devices, signals generated by part of the electronic devices can interfere with the output voltage of the power supply system, so that the fluctuation of the voltage output by the power supply system is larger.
Various power supply circuits are proposed in the related art to reduce the fluctuation of the output voltage of the power supply system, but there are some cases where the impedance is too high or the current flows backward.
Disclosure of Invention
The embodiment of the application provides a power supply circuit and a laser radar, which can reduce the fluctuation of voltage output by a power supply system.
In a first aspect, the present application provides a power supply circuit comprising:
a detection circuit for detecting a supply voltage of the power supply circuit;
a first controlled switch connected between an input terminal and an output terminal of the power supply circuit;
the control circuit is respectively connected with the detection circuit and the control end of the first controlled switch and is used for controlling the on or off of the first controlled switch according to the power supply voltage;
the first controlled switch is conducted, and the power supply circuit supplies power through a channel conducted by the first controlled switch;
the first controlled switch is turned off, and the power supply circuit supplies power through a parasitic diode of the first controlled switch.
Optionally, the power supply circuit further includes:
a first unidirectional conductive element connected in parallel with the first controlled switch;
the first controlled switch is turned off, and the power supply circuit supplies power through a parasitic diode of the first controlled switch and the first unidirectional conductive element.
Optionally, an input end of the detection circuit is connected with an input end of the power supply circuit;
the control circuit is connected with the output end of the detection circuit;
the control circuit is specifically configured to output a first voltage when a voltage difference between a maximum instantaneous voltage of the power supply circuit detected and recorded by the detection circuit and a current instantaneous voltage of the power supply circuit is greater than a voltage threshold; outputting a second voltage when the voltage difference between the maximum instantaneous voltage of the power supply circuit detected and recorded by the detection circuit and the current instantaneous voltage of the power supply circuit is smaller than or equal to a voltage threshold value;
the first voltage is smaller than the conducting voltage of the first controlled switch, and the second voltage is larger than the conducting voltage of the first controlled switch.
Optionally, the control circuit includes:
the first control end is connected with the output end of the detection circuit and is used for receiving the maximum instantaneous voltage of the power supply circuit detected and recorded by the detection circuit;
the second control end is connected with the input end of the power supply circuit and is used for receiving the current instantaneous voltage of the power supply circuit;
the control circuit is used for outputting a first voltage when the output voltage of the detection circuit is larger than the power supply voltage; wherein the first voltage is greater than a turn-on voltage of the first controlled switch; and outputting a second voltage at the output voltage of the detection circuit which is less than or equal to the supply voltage, wherein the second voltage is greater than the turn-on voltage of the first controlled switch.
Optionally, the control circuit includes:
the first controlled end of the second controlled switch is a first control end of the control circuit, and the control end of the second controlled switch is a second control end of the control circuit; the second controlled switch is turned on when a voltage difference between a maximum instantaneous voltage of the power supply circuit and a current instantaneous voltage of the power supply circuit is greater than a voltage threshold; when the voltage difference between the maximum instantaneous voltage of the power supply circuit and the current instantaneous voltage of the power supply circuit is less than or equal to a voltage threshold, the second controlled switch is opened;
the first controlled end of the third controlled switch is grounded, and the control end of the third controlled switch is connected with the second controlled end of the second controlled switch; the second controlled switch is conducted, and then the third controlled switch is conducted; the second controlled switch is opened, and then the third controlled switch is opened;
the first controlled end of the fourth controlled switch is connected with the input end of the power supply circuit, the second controlled end of the fourth controlled switch is grounded, and the control end of the fourth controlled switch is connected with the second controlled end of the third controlled switch; the third controlled switch is conducted, and then the fourth controlled switch is conducted; the third controlled switch is opened and then the fourth controlled switch is opened;
the fourth controlled switch is conducted, and then the first controlled switch is conducted; the fourth controlled switch is turned off and the first controlled switch is turned off.
Optionally, the first resistor and the second resistor are further connected in series between the second controlled end of the second controlled switch and the ground point, and the second resistor is located between the control end of the third controlled switch and the ground point.
Optionally, a first capacitive element is also connected between the first resistor and ground.
Optionally, a third resistor is further connected between the control terminal of the fourth controlled switch and the second controlled terminal of the third controlled switch.
Optionally, a second capacitive element is also connected between the third resistor and ground, and the second capacitive element is connected in parallel with the third controlled switch.
Optionally, the detection circuit includes:
and the third capacitive element is connected between the input end of the power supply circuit and the grounding point.
Optionally, the detection circuit further includes:
and the second unidirectional conducting element is connected between the input end of the power supply circuit and the third capacitance element.
Optionally, a fourth resistor is further connected between the control terminal of the first controlled switch and the ground point.
Optionally, a fifth resistor is further connected between the input terminal of the power supply circuit and the control terminal of the second controlled switch.
A second aspect of an embodiment of the present application provides a lidar, including:
the power supply circuit provided in any one of the above embodiments.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the beneficial effects that:
in this embodiment of the present application, first, because there is a parasitic diode in the first controlled switch, when the detection circuit detects that the voltage in the power supply circuit has a large fluctuation, the first controlled switch may be controlled to be turned off, so that the current in the power supply circuit passes through the parasitic diode in the first controlled switch to supply power to the load. Since the diode has a rectifying effect, the power supply circuit supplies power through the parasitic diode in the first controlled switch, and the fluctuation of the voltage in the power supply circuit can be reduced.
Secondly, because the first controlled switch is in an off state when power is supplied through the parasitic diode in the first controlled switch, based on the fact that the phenomenon that the voltage of the output end of the first controlled switch is higher than the voltage of the input end and current flows backwards due to the instant reduction of the voltage of the input end of the power supply circuit can be reduced, the probability that the first controlled switch is damaged due to current flowing backwards is reduced, and the service life of the power supply circuit is prolonged.
Finally, when the first controlled switch is in a conducting state, the power supply circuit supplies power through the channel conducted by the first controlled switch, and the resistance of the channel of the first controlled switch is smaller than that of the parasitic diode of the first controlled switch, so that the loss of the power supply circuit can be reduced through the channel conducted by the first controlled switch.
Drawings
Fig. 1 is a schematic structural diagram of a power supply circuit in an embodiment of the present application;
fig. 2 is a schematic structural diagram of another power supply circuit in an embodiment of the present application;
fig. 3 is a schematic structural diagram of another power supply circuit in an embodiment of the present application;
fig. 4 is a schematic structural diagram of another power supply circuit in an embodiment of the present application;
fig. 5 is a schematic structural diagram of another power supply circuit in an embodiment of the present application;
fig. 6 is a schematic structural diagram of another power supply circuit in an embodiment of the present application;
fig. 7 is a schematic structural diagram of another power supply circuit in an embodiment of the present application;
fig. 8 is a schematic structural diagram of another power supply circuit in an embodiment of the present application;
fig. 9 is a schematic structural diagram of another power supply circuit in the embodiment of the present application;
fig. 10 is a schematic structural diagram of another power supply circuit in the embodiment of the present application;
FIG. 11 is a schematic diagram of another power supply circuit according to an embodiment of the present disclosure;
fig. 12 is a schematic structural diagram of another power supply circuit in the embodiment of the present application;
fig. 13 is a schematic structural diagram of another power supply circuit in an embodiment of the present application.
Description of the drawings: 101: detection circuit, 102: first controlled switch, 103: control circuit, 104: a first unidirectional conductive element;
d1: second unidirectional conductive element, Q1: first triode, Q2: second triode, Q3: third triode, C1: first capacitive element, C2: second capacitive element, C3: third capacitive element, C4: fourth capacitive element, R1: first resistance, R2: second resistor, R3: third resistor, R4: fourth resistor, R5: fifth resistor, R6: and a sixth resistor.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a power supply circuit according to an embodiment of the present application, and as shown in fig. 1, the power supply circuit provided in the embodiment of the present application includes:
a detection circuit 101 for detecting a power supply voltage of the power supply circuit;
a first controlled switch 102 connected between an input and an output of the power supply circuit;
a control circuit 103 connected to the detection circuit 101 and the control terminal of the first controlled switch 102, respectively, for controlling the on or off of the first controlled switch 102 according to the supply voltage;
the first controlled switch 102 is conducted, and the power supply circuit supplies power through a channel conducted by the first controlled switch 102;
the first controlled switch 102 is open and the power supply circuit is powered by the parasitic diode of the first controlled switch 102.
The input terminal of the detection circuit 101 is connected to the input terminal of the power supply circuit, and the output terminal of the detection circuit 101 is connected to the input terminal of the control circuit 103, so that the detection circuit 101 can turn on or off the control circuit 103 based on detecting the power supply voltage at the input terminal of the power supply circuit.
The power supply voltage may be the maximum instantaneous voltage of the power supply circuit detected and recorded by the detection circuit, or may be other detected voltage values of the power supply circuit.
Illustratively, when the voltage detected by the detection circuit 101 is the maximum instantaneous voltage of the power supply circuit, the control circuit 103 is turned on if the voltage difference between the maximum instantaneous voltage of the power supply circuit and the current instantaneous voltage of the input of the power supply circuit is greater than a voltage threshold. The control circuit 103 is disconnected if the voltage difference between the maximum instantaneous voltage of the supply circuit and the current instantaneous voltage of the input of the supply circuit is less than or equal to the voltage threshold.
An input terminal of the control circuit 103 is connected to an output terminal of the detection circuit 101, and an output terminal of the control circuit 103 is connected to a control terminal of the first controlled switch 102. An input terminal of the first controlled switch 102 is connected to an input terminal of the power supply circuit, a control terminal of the first controlled switch 102 is connected to an output terminal of the control circuit 103, and an output voltage of the output terminal of the first controlled switch 102 is used to supply power to a load connected in the power supply circuit. When the control circuit 103 is in a conducting state, the first controlled switch 102 can be controlled to be turned off by the control terminal of the first controlled switch 102, and at this time, the power supply circuit supplies power to the load through the parasitic diode in the first controlled switch 102.
When the control circuit 103 is in an off state, the first controlled switch 102 can be controlled to be turned on by the control end of the first controlled switch 102, and at this time, the power supply circuit supplies power to the load through a channel on which the first controlled switch 102 is turned on.
The first controlled switch 102 may be a Metal-Oxide-semiconductor field effect transistor (MOSFET) with a parasitic diode, such as a P-type MOS transistor with a parasitic diode, hereinafter referred to as PMOS transistor.
In other embodiments, the first controlled switch may also be an NMOS transistor, and the gate of the NMOS transistor is connected to an inverter, so as to implement the function of the PMOS transistor.
The input end of the power supply circuit is connected with the positive electrode of the direct current power supply, the output end of the power supply circuit is connected with the negative electrode of the direct current power supply, and the direct current power supply is used for supplying power to the power supply circuit.
The load connected in the power supply circuit may be one or more loads connected in series or parallel between the output of the first controlled switch 102 and the output of the power supply circuit.
In this embodiment of the present application, first, because there is a parasitic diode in the first controlled switch, when the detection circuit detects that the voltage in the power supply circuit has a large fluctuation, the first controlled switch may be controlled to be turned off, so that the current in the power supply circuit passes through the parasitic diode in the first controlled switch to supply power to the load. Since the diode has a rectifying effect, the power supply circuit supplies power through the parasitic diode in the first controlled switch, and the fluctuation of the voltage in the power supply circuit can be reduced.
Secondly, since the first controlled switch is in an off state when power is supplied through the parasitic diode in the first controlled switch, based on this, it is possible to reduce the probability that the voltage at the output terminal of the first controlled switch is higher than the voltage at the input terminal due to the momentary decrease of the voltage at the input terminal of the power supply circuit, resulting in current flowing backward, causing damage to the first controlled switch.
Finally, when the first controlled switch is in a conducting state, the power supply circuit supplies power through the channel conducted by the first controlled switch, and the resistance of the channel of the first controlled switch is smaller than that of the parasitic diode of the first controlled switch, so that the loss of the power supply circuit can be reduced through the channel conducted by the first controlled switch.
Referring to fig. 2, in one embodiment, the power supply circuit further includes:
a first unidirectional conducting element 104 connected in parallel with the first controlled switch 102;
the first controlled switch 102 is opened and the power supply circuit supplies power through the parasitic diode of the first controlled switch 102 and the first unidirectional conductive element 104.
The first unidirectional conductive element may be a diode, or may be other unidirectional conductive elements, which is not limited in the embodiment of the present application.
When the first unidirectional conducting element is a diode, the model of the diode can be selected according to actual needs.
In addition, the number of the first unidirectional conductive elements connected in parallel with the first controlled switch may be one or more, which is not limited in the embodiment of the present application.
In the embodiment of the application, one or more first unidirectional conducting elements are connected in the power supply circuit, and the first unidirectional conducting elements are connected in parallel with the first controlled switch, so that the power supply circuit supplies power through parasitic diodes in the first unidirectional conducting elements and the first controlled switch simultaneously, and the power supply circuit can supply power for a load needing larger current.
In one embodiment, an input of the detection circuit is connected to an input of the power supply circuit;
the control circuit 103 is connected with the output end of the detection circuit 101;
the control circuit 103 is specifically configured to output a first voltage when a voltage difference between a maximum instantaneous voltage of the power supply circuit detected and recorded by the detection circuit 101 and a current instantaneous voltage of the power supply circuit is greater than a voltage threshold; outputting a second voltage when a voltage difference between a maximum instantaneous voltage of the power supply circuit detected and recorded by the detection circuit 101 and a current instantaneous voltage of the power supply circuit is less than or equal to a voltage threshold;
the first voltage is smaller than the conducting voltage of the first controlled switch, and the second voltage is larger than the conducting voltage of the first controlled switch.
Illustratively, referring to FIG. 3, the control circuit 103 includes:
the first control end a is connected with the output end of the detection circuit 101 and is used for receiving the maximum instantaneous voltage of the power supply circuit detected and recorded by the detection circuit;
and the second control end b is connected with the input end of the power supply circuit and is used for receiving the current instantaneous voltage of the power supply circuit.
For example, the control circuit 103 may be a control circuit including a transistor or a MOS transistor, or may be a control circuit including a subtractor and a comparator.
When the control circuit 103 is a control circuit including a triode, the first control terminal a is an emitter of the triode, and the second control terminal b is a base of the triode.
Based on this, when the voltage difference between the voltage of the emitter and the voltage of the base of the transistor in the control circuit 103 is greater than the on-voltage of the transistor, the control circuit 103 outputs the first voltage.
When the voltage difference between the voltage of the emitter of the transistor and the voltage of the base of the transistor is less than or equal to the on-voltage of the transistor, the control circuit 103 outputs a second voltage.
In addition, the first controlled switch 102 may be a PMOS transistor, where the input end of the first controlled switch 102 is a source of the PMOS, the output end of the first controlled switch 102 is a drain of the PMOS transistor, and the control end of the first controlled switch 102 is a gate of the PMOS transistor.
When the voltage difference between the maximum instantaneous voltage of the power supply circuit and the current instantaneous voltage of the power supply circuit detected and recorded by the detection circuit 101 is greater than the voltage threshold, it is indicated that the voltage output by the direct current power supply system connected with the input end of the power supply circuit has a large fluctuation, and at this time, the control circuit outputs the first voltage.
Because the first voltage is smaller than the conduction voltage of the PMOS tube, the source electrode and the drain electrode of the PMOS tube are disconnected, the power supply circuit is powered by the parasitic diode in the PMOS tube, and the parasitic diode can rectify the power supply circuit, so that the voltage passing through the parasitic diode is more stable.
When the voltage difference between the maximum instantaneous voltage of the power supply circuit and the current instantaneous voltage of the power supply circuit detected and recorded by the detection circuit 101 is smaller than or equal to the voltage threshold, the voltage fluctuation of the input end of the power supply circuit is smaller, at this time, the control circuit 103 outputs a second voltage larger than the conduction voltage of the PMOS transistor, the source and the drain of the PMOS transistor are conducted, and the power supply circuit supplies power through the channel of the PMOS transistor.
Because the resistance of the channel of the PMOS tube is smaller than that of the parasitic diode of the PMOS tube, the loss of the power supply circuit can be reduced when power is supplied through the channel of the PMOS tube.
In this embodiment of the present application, when the voltage difference between the maximum instantaneous voltage of the power supply circuit and the current instantaneous voltage of the power supply circuit, which are detected and recorded by the detection circuit, is greater than the voltage threshold, the first controlled switch is turned off, and the power supply circuit supplies power through the parasitic diode of the first controlled switch.
In addition, since the first controlled switch is in an off state during the power supply through the parasitic diode of the first controlled switch, based on this, the probability of the first controlled switch being damaged due to current flowing backward caused by the fact that the voltage of the output terminal of the first controlled switch is higher than the voltage of the input terminal due to the momentary decrease of the voltage of the input terminal of the power supply circuit can be reduced.
In one embodiment, the control circuit 103 includes:
the first controlled end of the second controlled switch is a first control end of the control circuit, and the control end of the second controlled switch is a second control end of the control circuit; the second controlled switch is turned on when a voltage difference between a maximum instantaneous voltage of the power supply circuit and a current instantaneous voltage of the power supply circuit is greater than a voltage threshold; when the voltage difference between the maximum instantaneous voltage of the power supply circuit and the current instantaneous voltage of the power supply circuit is less than or equal to a voltage threshold, the second controlled switch is opened;
the first controlled end of the third controlled switch is grounded, and the control end of the third controlled switch is connected with the second controlled end of the second controlled switch; the second controlled switch is conducted, and then the third controlled switch is conducted; the second controlled switch is opened, and then the third controlled switch is opened;
the first controlled end of the fourth controlled switch is connected with the input end of the power supply circuit, the second controlled end of the fourth controlled switch is grounded, and the control end of the fourth controlled switch is connected with the second controlled end of the third controlled switch; the third controlled switch is conducted, and then the fourth controlled switch is conducted; the third controlled switch is opened and then the fourth controlled switch is opened;
the fourth controlled switch is turned on, and the first controlled switch 102 is turned on; the fourth controlled switch is opened and the first controlled switch 102 is opened.
Illustratively, the second controlled switch and the fourth controlled switch may be PNP transistors, and the third controlled switch may be NPN transistors.
Referring to fig. 4, when the second controlled switch and the fourth controlled switch are PNP transistors, the third controlled switch is an NPN transistor, and the first controlled switch 102 is a PMOS transistor. For convenience of explanation, the second controlled switch is referred to as a first transistor, the third controlled switch is referred to as a second transistor, and the fourth controlled switch is referred to as a third transistor.
The emitter of the first triode (e pole of Q1 in fig. 4) is connected to the output of the detection circuit 101, the base of the first triode (b pole of Q1 in fig. 4) is connected to the input of the power supply circuit, and the collector of the first triode (c pole of Q1 in fig. 4) is connected to the base of the second triode (b pole of Q2 in fig. 4).
The emitter of the second transistor (e pole of Q2 in fig. 4) is grounded, and the collector of the second transistor (c pole of Q2 in fig. 4) is connected to the base of the third transistor (b pole of Q3 in fig. 4). The emitter of the third transistor (e pole of Q3 in fig. 4) is connected to the input of the power supply circuit, and the collector of the third transistor (c pole of Q3 in fig. 4) is grounded.
The grid electrode of the PMOS and the collector electrode of the third triode are positioned on the same branch circuit of the power supply circuit and are grounded. The source electrode of the PMOS tube is connected with the input end of the power supply circuit, and the drain electrode of the PMOS tube is connected with the output end of the power supply circuit.
Based on the power supply circuit, when the voltage difference between the maximum instantaneous voltage of the power supply circuit and the current instantaneous voltage of the power supply circuit, that is, the voltage difference between the emitter and the base of the first transistor is greater than the conduction voltage of the first transistor, the first transistor is turned on.
When the first triode is conducted, the voltage on the base electrode of the second triode connected with the first triode is increased, and the voltage difference between the base electrode and the emitter electrode of the second triode is larger than the conducting voltage of the second triode because the emitter electrode of the second triode is grounded.
When the second triode is conducted, the third electrode tube is conducted, and when the third electrode tube is conducted, the voltage of the grid electrode of the PMOS tube is increased, so that the voltage difference between the grid electrode and the source electrode of the PMOS tube is reduced to be smaller than the conducting voltage of the PMOS, and the PMOS tube is disconnected.
The first transistor is turned off when a voltage difference between a maximum instantaneous voltage of the power supply circuit and a current instantaneous voltage of the power supply circuit, i.e., a voltage difference between an emitter and a base of the first transistor is smaller than a turn-on voltage of the first transistor. When the first transistor is disconnected, the voltage on the base of a second transistor connected with the first transistor is reduced, and the second transistor is disconnected.
When the second triode is disconnected, the third electrode tube is disconnected.
When the third transistor is disconnected, the voltage of the grid electrode of the PMOS transistor is reduced, so that the voltage difference between the grid electrode and the source electrode of the PMOS transistor is increased to the conducting voltage of the PMOS transistor, and the PMOS transistor is conducted.
Referring to fig. 5, in one embodiment, the first resistor (R1 in fig. 5) and the second resistor (R2 in fig. 5) are also connected in series between the second controlled terminal of the second controlled switch and ground, and the second resistor is located between the control terminal of the third controlled switch and ground.
Because the conduction voltages of the triodes of different models are different, when the first resistor and the second resistor are added in the power supply circuit of the embodiment of the application, the voltage of the control end of the third controlled switch can be adjusted by selecting the first resistor and the second resistor with different resistance values.
Referring to fig. 6, a first capacitive element (C1 in fig. 6) is also connected between the first resistor and the ground point.
Because the capacitor has an energy storage function, when the first capacitor element is connected between the first resistor and the grounding point, the first capacitor charges and stores electric energy when the second controlled switch is conducted. If the first capacitor stores a certain amount of electricity, the voltage of the first capacitor is kept unchanged, and at the moment, the voltage output from two ends of the first capacitor is kept unchanged.
Based on this, when the second controlled switch is turned off due to the voltage drop at the input terminal of the power supply circuit, the first capacitive element may continue to supply power to the control terminal of the third controlled switch, so that the third controlled switch continues to maintain the on state, and further the first controlled switch 102 is in the off state. Based on this, the probability of the first controlled switch 102 being damaged due to current flowing backward caused by the voltage at the output terminal of the first controlled switch 102 being greater than the voltage at the input terminal due to the momentary decrease in the power supply voltage can be further reduced.
In one embodiment, a third resistor is further connected between the control terminal of the fourth controlled switch and the second controlled terminal of the third controlled switch.
Referring to fig. 7, a third resistor (R3 in fig. 7) is connected between the collector of the second transistor and the base of the third diode, and based on this, the voltage on the base of the third transistor can be controlled by selecting the third resistor with different resistance values due to the different on-voltages of the different types of transistors.
In one embodiment, referring to fig. 8, a second capacitive element (C2 in fig. 8) is also connected between the third resistor (R3 in fig. 8) and ground, and is connected in parallel with the third controlled switch.
In the embodiment of the present application, for the same reason as that the first capacitive element is added to the power supply circuit to extend the on-time of the third controlled switch, by connecting the second capacitive element between the third resistor and the ground point, the on-time of the fourth controlled switch may be further extended, so as to reduce the probability of damage to the first controlled switch 102 caused by current backflow.
Referring to fig. 9, in one embodiment, the detection circuit 101 includes:
and a third capacitive element (C3 in fig. 9) connected between the input terminal of the power supply circuit and the ground point.
The model of the third capacitive element in the detection circuit 101 may be selected as required, which is not limited in the embodiment of the present application.
Because the capacitor has an energy storage function, the third capacitor element is connected to the detection circuit 101 in the embodiment of the present application, so that the electric energy provided by the input end of the power supply circuit can be stored, and the voltage of the output end of the detection circuit 101 is maintained to be the maximum instantaneous voltage of the input end of the power supply circuit.
In one embodiment, referring to fig. 10, the detection circuit 101 further includes:
a second unidirectional conductive element (D1 in fig. 10) connected between the input terminal of the power supply circuit and the third capacitive element.
The second unidirectional conductive element in the embodiment of the present application may be a diode, or may be another unidirectional conductive element, which is not limited in the embodiment of the present application.
As can be seen from the above description, when the power supply system connected to the power supply circuit is interfered by an external signal, the output voltage of the power supply system may fluctuate, and the capacitor element has a function of passing alternating current and blocking direct current, so that the voltage at the input end of the power supply circuit can be rectified by connecting one or more diodes between the third capacitor element and the input end of the power supply circuit, thereby improving the energy storage effect of the third capacitor element.
In one embodiment, referring to fig. 11, a fourth resistor (R4 in fig. 11) is further connected between the control terminal of the first controlled switch 102 and ground.
When the first controlled switch 102 is a MOS transistor, due to different turn-on voltages of the MOS transistors of different types, the voltage on the control terminal of the first controlled switch 102 is controlled by connecting a fourth resistor between the control terminal of the first controlled switch 102 and the ground point and selecting the resistors with different resistance values.
In one embodiment, referring to fig. 12, a fifth resistor (R5 in fig. 12) is also connected between the input of the power supply circuit and the control terminal of the second controlled switch.
The number of the fifth resistors may be one or a plurality of fifth resistors connected in series, and only one fifth resistor is shown in fig. 12, but the number of the fifth resistors in the embodiment of the present application is not limited.
In addition, the magnitude of the resistance value of the fifth resistor may be selected according to actual needs, which is not limited in the embodiment of the present application.
In this embodiment, when the second controlled switch is a transistor, the magnitude of the current flowing through the base of the transistor may be controlled by connecting one or more fifth resistors between the input terminal of the power supply circuit and the control terminal of the second controlled switch.
Referring to fig. 12, the power supply circuit of the embodiment of the present application acquires the maximum instantaneous voltage of the power supply circuit through D1 and C3, and maintains the maximum instantaneous voltage Vpeak of the power supply circuit through C3. When the voltage difference between Vpeak and the current instantaneous voltage of the power supply circuit is greater than the turn-on voltage of Q1, Q1 is turned on. The c (collector) end of the Q1 outputs a high-level signal, the Q2 is started, then the Q3 is started after the Q2 is conducted, the GS voltage of the MOS tube is pulled down after the Q3 is conducted, and the channel of the MOS tube is turned off.
In an embodiment, the power supply voltage detected by the detection circuit may further include a first detection voltage and a second detection voltage, where the first detection voltage is a maximum instantaneous voltage of the power supply circuit, and the second detection voltage is an average value of multiple instantaneous voltages at an input terminal of the power supply circuit.
Since the input terminal of the control circuit 103 is connected to the output terminal of the detection circuit 101, the output terminal of the control circuit 103 is connected to the control terminal of the first controlled switch 102.
Based on this, if the voltage difference between the first detection voltage and the second detection voltage is greater than the reference voltage, the control circuit 103 is turned on.
If the voltage difference between the first detection voltage and the second detection voltage is less than or equal to the reference voltage, the control circuit 103 is turned off.
An input terminal of the first controlled switch 102 is connected to an input terminal of the power supply circuit, a control terminal of the first controlled switch 102 is connected to an output terminal of the control circuit 103, and an output voltage of the output terminal of the first controlled switch 102 is used to supply power to a load connected in the power supply circuit.
When the control circuit 103 is in a conducting state, the first controlled switch 102 can be controlled to be turned off by the control terminal of the first controlled switch 102, and at this time, the power supply circuit supplies power to the load through the parasitic diode in the first controlled switch 102.
When the control circuit 103 is in an off state, the first controlled switch 102 can be controlled to be turned on by the control end of the first controlled switch 102, and at this time, the power supply circuit supplies power to the load through a channel on which the first controlled switch 102 is turned on.
Illustratively, referring to fig. 13, the detection circuit 101 includes:
a second unidirectional conductive element (D1 in fig. 13) connected between the input of the power supply circuit and the first input of the control circuit;
a third capacitive element (C3 in fig. 13) connected between the second unidirectional conductive element and the ground point;
a sixth resistor (R6 in fig. 13) connected between the input terminal of the power supply circuit and the second input terminal of the control circuit;
and the fourth capacitor element is connected between the sixth resistor and the grounding point.
The detection circuit may provide a first detection voltage to the first input of the control circuit based on the second unidirectional conductive element and the third capacitive element described above.
Based on the sixth resistor and the fourth capacitive element described above, the function of the low-pass filter may be implemented, so that the detection circuit may provide the second detection voltage to the second input of the control circuit.
The control circuit 103 includes:
the subtracter comprises a first input end, a second input end and an output end, wherein the first input end of the subtracter is the first input end of the control circuit, and the second input end of the subtracter is the second input end of the control circuit. Based on this, the subtractor can acquire a voltage difference between the first detection voltage and the second detection voltage, and output the voltage difference.
And the input end of the comparator is connected with the output end of the subtracter and is used for comparing the voltage difference between the first detection voltage and the second detection voltage with the reference voltage, outputting a high level when the voltage difference between the first detection voltage and the second detection voltage is larger than the reference voltage, and outputting a low level when the voltage difference between the first detection voltage and the second detection voltage is smaller than or equal to the reference voltage.
And a third controlled switch (Q2 in fig. 13), the control terminal (b pole in Q2 in fig. 13) of the third controlled switch is connected to the output terminal of the comparator, and the first controlled terminal (e pole in Q2 in fig. 13) of the third controlled switch is grounded. The third controlled switch is turned on when the comparator outputs a high level, and turned off when the comparator outputs a low level.
The first controlled end (e pole in Q3 in FIG. 13) of the fourth controlled switch is connected with the input end of the power supply circuit, the second controlled end (c pole in Q3 in FIG. 13) of the fourth controlled switch is grounded, and the control end (b pole in Q3 in FIG. 13) of the fourth controlled switch is connected with the second controlled end (c pole in Q2 in FIG. 13) of the third controlled switch; the third controlled switch is turned on, and the fourth controlled switch is turned on; the third controlled switch is opened, and the fourth controlled switch is opened;
the fourth controlled switch is turned on, and then the first controlled switch is turned on; the fourth controlled switch is turned off and the first controlled switch is turned off.
The first controlled switch is conducted, and the power supply circuit supplies power through a channel conducted by the first controlled switch; the first controlled switch is opened and the power supply circuit is powered by a parasitic diode of the first controlled switch.
The embodiment of the application also provides a laser radar, which comprises:
the power supply circuit provided in any one of the above embodiments.
The lidar further comprises:
a laser transmitter and/or a laser receiver.
The power supply circuit is connected with the laser transmitter and/or the laser receiver and provides working voltage for the laser transmitter and/or the laser receiver.
It will be understood by those skilled in the art that the sequence number of each step in the above embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present invention.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; while the invention has been described in detail with reference to the foregoing embodiments, it will be appreciated by those skilled in the art that variations may be made in the techniques described in the foregoing embodiments, or equivalents may be substituted for elements thereof; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.

Claims (14)

1. A power supply circuit, comprising:
a detection circuit for detecting a supply voltage of the power supply circuit;
a first controlled switch connected between an input terminal and an output terminal of the power supply circuit;
the control circuit is respectively connected with the detection circuit and the control end of the first controlled switch and is used for controlling the on or off of the first controlled switch according to the power supply voltage;
the first controlled switch is conducted, and the power supply circuit supplies power through a channel conducted by the first controlled switch;
the first controlled switch is turned off, and the power supply circuit supplies power through a parasitic diode of the first controlled switch.
2. The power supply circuit of claim 1, wherein the power supply circuit further comprises:
a first unidirectional conductive element connected in parallel with the first controlled switch;
the first controlled switch is turned off, and the power supply circuit supplies power through a parasitic diode of the first controlled switch and the first unidirectional conductive element.
3. The power supply circuit of claim 1, wherein an input of the detection circuit is connected to an input of the power supply circuit;
the control circuit is connected with the output end of the detection circuit;
the control circuit is specifically configured to output a first voltage when a voltage difference between a maximum instantaneous voltage of the power supply circuit detected and recorded by the detection circuit and a current instantaneous voltage of the power supply circuit is greater than a voltage threshold; outputting a second voltage when the voltage difference between the maximum instantaneous voltage of the power supply circuit detected and recorded by the detection circuit and the current instantaneous voltage of the power supply circuit is smaller than or equal to a voltage threshold value;
the first voltage is smaller than the conducting voltage of the first controlled switch, and the second voltage is larger than the conducting voltage of the first controlled switch.
4. A power supply circuit according to claim 3, wherein the control circuit comprises:
the first control end is connected with the output end of the detection circuit and is used for receiving the maximum instantaneous voltage of the power supply circuit detected and recorded by the detection circuit;
the second control end is connected with the input end of the power supply circuit and used for receiving the current instantaneous voltage of the power supply circuit.
5. The power supply circuit of claim 4, wherein the control circuit comprises:
the first controlled end of the second controlled switch is a first control end of the control circuit, and the control end of the second controlled switch is a second control end of the control circuit; the second controlled switch is turned on when a voltage difference between a maximum instantaneous voltage of the power supply circuit and a current instantaneous voltage of the power supply circuit is greater than a voltage threshold; when the voltage difference between the maximum instantaneous voltage of the power supply circuit and the current instantaneous voltage of the power supply circuit is less than or equal to a voltage threshold, the second controlled switch is opened;
the first controlled end of the third controlled switch is grounded, and the control end of the third controlled switch is connected with the second controlled end of the second controlled switch; the second controlled switch is conducted, and then the third controlled switch is conducted; the second controlled switch is opened, and then the third controlled switch is opened;
the first controlled end of the fourth controlled switch is connected with the input end of the power supply circuit, the second controlled end of the fourth controlled switch is grounded, and the control end of the fourth controlled switch is connected with the second controlled end of the third controlled switch; the third controlled switch is conducted, and then the fourth controlled switch is conducted; the third controlled switch is opened and then the fourth controlled switch is opened;
the fourth controlled switch is conducted, and then the first controlled switch is conducted; the fourth controlled switch is turned off and the first controlled switch is turned off.
6. The power supply circuit of claim 5, wherein the first resistor and the second resistor are further connected in series between the second controlled terminal of the second controlled switch and a ground point, and the second resistor is located between the control terminal of the third controlled switch and the ground point.
7. The power supply circuit of claim 6, wherein a first capacitive element is further connected between the first resistor and ground.
8. The power supply circuit of claim 7, wherein a third resistor is further connected between the control terminal of the fourth controlled switch and the second controlled terminal of the third controlled switch.
9. The power supply circuit of claim 8, wherein a second capacitive element is also connected between the third resistor and ground, and the second capacitive element is connected in parallel with the third controlled switch.
10. The power supply circuit of claim 9, wherein the detection circuit comprises:
and the third capacitive element is connected between the input end of the power supply circuit and the grounding point.
11. The power supply circuit of claim 10, wherein the detection circuit further comprises:
and the second unidirectional conducting element is connected between the input end of the power supply circuit and the third capacitance element.
12. The power supply circuit of claim 11, wherein a fourth resistor is further connected between the control terminal of the first controlled switch and ground.
13. The power supply circuit of claim 12, further comprising a fifth resistor connected between the input of the power supply circuit and the control of the second controlled switch.
14. A lidar, comprising:
a power supply circuit as provided in any one of claims 1 to 13.
CN202211049923.7A 2022-08-30 2022-08-30 Power supply circuit and laser radar Pending CN117674010A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211049923.7A CN117674010A (en) 2022-08-30 2022-08-30 Power supply circuit and laser radar

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211049923.7A CN117674010A (en) 2022-08-30 2022-08-30 Power supply circuit and laser radar

Publications (1)

Publication Number Publication Date
CN117674010A true CN117674010A (en) 2024-03-08

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211049923.7A Pending CN117674010A (en) 2022-08-30 2022-08-30 Power supply circuit and laser radar

Country Status (1)

Country Link
CN (1) CN117674010A (en)

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