CN210608513U - Overvoltage and undervoltage protection circuit - Google Patents
Overvoltage and undervoltage protection circuit Download PDFInfo
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- CN210608513U CN210608513U CN201920941240.XU CN201920941240U CN210608513U CN 210608513 U CN210608513 U CN 210608513U CN 201920941240 U CN201920941240 U CN 201920941240U CN 210608513 U CN210608513 U CN 210608513U
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Abstract
The utility model discloses an overvoltage and undervoltage protection circuit, the input end of the circuit is used for connecting a power supply; the circuit output end is used for connecting a power supply input end of the powered device; the input end of the overvoltage switch module is connected with the input end of the circuit, the output end of the overvoltage switch module is connected with the input end of the undervoltage switch module, and the control end of the overvoltage switch module is connected with the first end of the overvoltage detection module; the control end of the overvoltage detection module is connected with the input end of the circuit, and the second end of the overvoltage detection module is grounded; the output end of the under-voltage switch module is connected with the output end of the circuit, and the control end of the under-voltage switch module is connected with the first end of the under-voltage detection module; the control end of the undervoltage detection module is connected with the output end of the overvoltage switch module, and the second end of the undervoltage detection module is grounded. The utility model discloses can effectively prevent to cross the low powered device that perhaps too high arouses because of power supply's voltage and start badly, damage powered device even to guarantee that powered device normally works.
Description
Technical Field
The utility model relates to a voltage protection technical field especially relates to an excessive pressure and undervoltage protection circuit.
Background
With the development of network technology, the types of network devices are increasing, and the types of power adapters for supplying power to the network devices are also increasing, and different power adapters have different output voltages, so that if a wrong power adapter is used carelessly, or the output voltage of the power adapter is abnormal, the output voltage of the power adapter is too low or too high, which may cause poor start of the network device, or even directly damage the network device.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an excessive pressure and undervoltage protection circuit can prevent effectively that the powered device that causes because of power supply's voltage crosses lowly or too high starts badly, damages the powered device even to guarantee that the powered device normally works.
In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions: the overvoltage and undervoltage protection circuit comprises a circuit input end, an overvoltage switch module, an overvoltage detection module, an undervoltage switch module, an undervoltage detection module and a circuit output end; wherein the content of the first and second substances,
the input end of the circuit is used for connecting a power supply; the circuit output end is used for connecting a power supply input end of the powered device;
the input end of the overvoltage switch module is connected with the input end of the circuit, the output end of the overvoltage switch module is connected with the input end of the undervoltage switch module, and the control end of the overvoltage switch module is connected with the first end of the overvoltage detection module;
the control end of the overvoltage detection module is connected with the input end of the circuit, and the second end of the overvoltage detection module is grounded;
the output end of the under-voltage switch module is connected with the output end of the circuit, and the control end of the under-voltage switch module is connected with the first end of the under-voltage detection module;
the control end of the undervoltage detection module is connected with the output end of the overvoltage switch module, and the second end of the undervoltage detection module is grounded.
Preferably, the circuit further comprises an overvoltage indication module;
the input end of the overvoltage indication module is connected with the input end of the circuit, and the output end of the overvoltage indication module is connected with the first end of the overvoltage detection module.
Preferably, the circuit further comprises an under-voltage indication module;
the input end of the undervoltage indication module is connected with the first end of the undervoltage detection module, and the output end of the undervoltage indication module is connected with the second end of the undervoltage detection module.
Preferably, the overvoltage switch module comprises a first relay, a first resistor and a first diode;
the first end of the first relay is the input end of the overvoltage switch module, the second end of the first relay is the output end of the overvoltage switch module, the third end of the first relay is connected with the cathode of the first diode, and the fourth end of the first relay is the control end of the overvoltage switch module;
a first end of the first resistor is connected with a first end of the first relay, and a second end of the first resistor is connected with a cathode of the first diode;
and the anode of the first diode is connected with the fourth end of the first relay.
Preferably, the overvoltage detection module comprises a first voltage regulator tube, a second resistor, a third resistor and a first switch tube;
the cathode of the first voltage-stabilizing tube is the control end of the overvoltage detection module, and the anode of the first voltage-stabilizing tube is connected with the first end of the second resistor;
the second end of the second resistor is connected with the control end of the first switching tube;
the input end of the first switch tube is the first end of the overvoltage detection module, and the output end of the first switch tube is the second end of the overvoltage detection module;
the first end of the third resistor is connected with the control end of the first switch tube, and the second end of the third resistor is connected with the output end of the first switch tube.
Preferably, the undervoltage switch module comprises a second relay, a fourth resistor and a second diode;
the first end of the second relay is the input end of the undervoltage switch module, the second end of the second relay is the output end of the undervoltage switch module, the third end of the second relay is connected with the cathode of the second diode, and the fourth end of the second relay is the control end of the undervoltage switch module;
a first end of the fourth resistor is connected with a first end of the second relay, and a second end of the fourth resistor is connected with a cathode of the second diode;
and the anode of the second diode is connected with the fourth end of the second relay.
Preferably, the undervoltage detection module comprises a second voltage regulator tube, a fifth resistor, a sixth resistor and a second switch tube;
the cathode of the second voltage-stabilizing tube is the control end of the under-voltage detection module, and the anode of the second voltage-stabilizing tube is connected with the first end of the fifth resistor;
the second end of the fifth resistor is connected with the control end of the second switching tube;
the input end of the second switch tube is the first end of the under-voltage detection module, and the output end of the second switch tube is the second end of the under-voltage detection module;
the first end of the sixth resistor is connected with the control end of the second switch tube, and the second end of the sixth resistor is connected with the output end of the second switch tube.
Preferably, the overvoltage indication module comprises a seventh resistor and a first light emitting diode;
the first end of the seventh resistor is the input end of the overvoltage indication module, and the second end of the seventh resistor is connected with the anode of the first light-emitting diode;
and the cathode of the first light-emitting diode is the output end of the overvoltage indication module.
Preferably, the undervoltage indication module includes an eighth resistor and a second light emitting diode;
the first end of the eighth resistor is the input end of the undervoltage indicating module, and the second end of the eighth resistor is connected with the anode of the second light-emitting diode;
and the cathode of the second light-emitting diode is the output end of the under-voltage indicating module.
Preferably, the overvoltage switch module comprises a third switch tube and a ninth resistor;
the first end of the third switching tube is the input end of the overvoltage switch module, the second end of the third switching tube is the output end of the overvoltage switch module, and the control end of the third switching tube is the control end of the overvoltage switch module;
the first end of the ninth resistor is connected with the first end of the third switching tube, and the second end of the ninth resistor is connected with the control end of the third switching tube.
As a preferred scheme, the under-voltage switch module comprises a fourth switch tube and a tenth resistor;
the first end of the fourth switching tube is the input end of the under-voltage switch module, the second end of the fourth switching tube is the output end of the under-voltage switch module, and the control end of the fourth switching tube is the control end of the under-voltage switch module;
and a first end of the tenth resistor is connected with a first end of the fourth switch tube, and a second end of the tenth resistor is connected with a control end of the fourth switch tube.
Compared with the prior art, the embodiment of the utility model provides an excessive pressure and undervoltage protection circuit, through with excessive pressure switch module and undervoltage switch module series connection in proper order between power supply and powered device, when the supply voltage that excessive pressure detection module detected power supply was greater than the high-pressure threshold value, control excessive pressure switch module disconnection power supply route, when undervoltage detection module detected supply voltage and was less than the low pressure threshold value, control undervoltage switch module disconnection power supply route, make the supply voltage that the powered device acquireed in normal voltage range, can effectively prevent because of supply voltage crosses the low powered device that arouses that extremely high or start badly, damage the powered device even, thereby guarantee the powered device normal work.
Drawings
Fig. 1 is a block diagram of a preferred embodiment of an overvoltage and undervoltage protection circuit according to the present invention;
fig. 2 is a block diagram of another preferred embodiment of an overvoltage and undervoltage protection circuit according to the present invention;
fig. 3 is a schematic circuit diagram of a preferred embodiment of an over-voltage and under-voltage protection circuit according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the ordinary skilled in the art without creative work all belong to the protection scope of the present invention.
An embodiment of the present invention provides an overvoltage and undervoltage protection circuit, which is a structural block diagram of an preferred embodiment of the overvoltage and undervoltage protection circuit provided by the present invention, as shown IN fig. 1, wherein the circuit includes a circuit input terminal V _ IN, an overvoltage switch module 100, an overvoltage detection module 200, an undervoltage switch module 300, an undervoltage detection module 400, and a circuit output terminal V _ OUT; wherein the content of the first and second substances,
the circuit input end V _ IN is used for connecting a power supply; the circuit output end V _ OUT is used for connecting a power supply input end of a powered device;
the input end of the overvoltage switch module 100 is connected to the circuit input end V _ IN, the output end of the overvoltage switch module 100 is connected to the input end of the undervoltage switch module 300, and the control end of the overvoltage switch module 100 is connected to the first end of the overvoltage detection module 200;
the control end of the overvoltage detection module 200 is connected with the circuit input end V _ IN, and the second end of the overvoltage detection module 200 is grounded;
the output end of the under-voltage switch module 300 is connected to the circuit output end V _ OUT, and the control end of the under-voltage switch module 300 is connected to the first end of the under-voltage detection module 400;
the control end of the under-voltage detection module 400 is connected to the output end of the overvoltage switch module 100, and the second end of the under-voltage detection module 400 is grounded.
IN specific implementation, a circuit input end V _ IN obtains a power supply voltage from a power supply, overvoltage judgment is performed on the power supply voltage through the overvoltage detection module 200, and when the power supply voltage is greater than a preset high-voltage threshold VH, the overvoltage switch module 100 is IN a disconnected state through the action of the overvoltage detection module 200 to disconnect a power supply path from the circuit input end V _ IN to the circuit output end V _ OUT, so that overvoltage protection on the powered device is realized; when the power supply voltage is not greater than a preset high-voltage threshold value VH, the overvoltage switch module 100 is IN a closed state through the action of the overvoltage detection module 200, the power supply voltage is transmitted to a later stage through the overvoltage switch module 100, at the moment, the undervoltage detection module 400 performs undervoltage judgment on the power supply voltage, and when the power supply voltage is less than a preset low-voltage threshold value VL, the undervoltage switch module 300 is IN an open state through the action of the undervoltage detection module 400, so that a power supply path from a circuit input end V _ IN to a circuit output end V _ OUT is disconnected, and the undervoltage protection of the powered device is realized; when the supply voltage is not less than the preset low voltage threshold VL, the under-voltage switch module 300 is in a closed state by the action of the under-voltage detection module 400, and at this time, the supply voltage is transmitted to the power input end of the powered device through the circuit output end V _ OUT; after passing through the overvoltage protection circuit and the undervoltage protection circuit in sequence, the power supply voltage supplies power to the powered device, and the power supply voltage acquired by the powered device can be guaranteed to be within a normal voltage range, namely the acquired power supply voltage is not greater than a high-voltage threshold VH and not less than a low-voltage threshold VL.
The circuit can be applied to network devices such as a router and the like, and can also be applied to other powered devices; when the router is practically applied to a router, the circuit input end V _ IN can be connected with the output end of the power adapter, the circuit output end V _ OUT can be connected with the power input end of the router, and at the moment, the power supply is obtained from the mains supply by the power adapter.
The embodiment of the utility model provides an excessive pressure and undervoltage protection circuit, through with excessive pressure switch module and undervoltage switch module series connection in proper order between power supply and powered device, when the supply voltage that excessive pressure detection module detected power supply is greater than the high-pressure threshold value, supply voltage is too high can lead to the powered device to be damaged, then control excessive pressure switch module disconnection power supply route, when the undervoltage detection module detects that supply voltage is less than the low-pressure threshold value, supply voltage is low enough can lead to powered device to start badly, then control undervoltage switch module disconnection power supply route, make the supply voltage that the powered device acquireed in normal voltage range, can effectively prevent because of supply voltage is low or too high the powered device that arouses starts badly, damage the powered device even, thereby guarantee the powered device normal work.
Referring to fig. 2, it is a block diagram of another preferred embodiment of the overvoltage and undervoltage protection circuit provided in the present invention, and in another preferred embodiment, the circuit further includes an overvoltage indication module 500;
the input end of the overvoltage indication module 500 is connected to the circuit input end V _ IN, and the output end of the overvoltage indication module 500 is connected to the first end of the overvoltage detection module 200.
In specific implementation, in combination with the above embodiments, when the power supply voltage is greater than the preset high voltage threshold VH, the overvoltage indication module 500 performs corresponding overvoltage indication through the function of the overvoltage detection module 200 to remind a user that the power supply voltage is too high.
The embodiment of the utility model provides an excessive pressure and undervoltage protection circuit instructs the excessive pressure state through excessive pressure indicating module, can convenience of customers judge whether too high of supply voltage, improves user experience.
In yet another preferred embodiment, shown in conjunction with fig. 2, the circuit further comprises a brown-out indication module 600;
the input end of the under-voltage indication module 600 is connected to the first end of the under-voltage detection module 400, and the output end of the under-voltage indication module 600 is connected to the second end of the under-voltage detection module 400.
In specific implementation, in combination with the above embodiments, when the power supply voltage is smaller than the preset low voltage threshold VL, the under-voltage indication module 600 performs corresponding under-voltage indication through the function of the under-voltage detection module 400, so as to remind the user that the power supply voltage is too low.
The embodiment of the utility model provides an excessive pressure and undervoltage protection circuit instructs the undervoltage condition through undervoltage indicating module, can convenience of customers judge whether low excessively of supply voltage, improves user experience.
Referring to fig. 3, which is a schematic circuit diagram of a preferred embodiment of the overvoltage and undervoltage protection circuit provided in the present invention, as an improvement of the above solution, the overvoltage switch module 100 includes a first relay SW1, a first resistor R1, and a first diode D1;
a first end of the first relay SW1 is an input end of the overvoltage switch module 100, a second end of the first relay SW1 is an output end of the overvoltage switch module 100, a third end of the first relay SW1 is connected with a cathode of the first diode D1, and a fourth end of the first relay SW1 is a control end of the overvoltage switch module 100;
a first end of the first resistor R1 is connected to a first end of the first relay SW1, and a second end of the first resistor R1 is connected to a cathode of the first diode D1;
an anode of the first diode D1 is connected to a fourth terminal of the first relay SW 1.
IN specific implementation, IN combination with the above embodiment, when the power supply voltage is greater than the preset high voltage threshold VH, the overvoltage detection module 200 is used to make the first relay SW1 IN the off state, so as to disconnect the power supply path from the circuit input terminal V _ IN to the circuit output terminal V _ OUT, thereby implementing overvoltage protection on the powered device; when the power supply voltage is not greater than the preset high-voltage threshold VH, the first relay SW1 is in a closed state through the action of the overvoltage detection module 200, and the power supply voltage is transmitted to the undervoltage protection circuit at the rear stage through the first relay SW1 to be processed correspondingly.
It should be noted that the first relay SW1 corresponds to a switch, and is in a closed state by default, and is used for controlling the on/off of the power supply path; the first resistor R1 is a voltage dividing resistor for preventing the control voltage between the third terminal and the fourth terminal of the first relay SW1 from being too high; the first diode D1 is a freewheeling diode for freewheeling when the control voltage between the third terminal and the fourth terminal of the first relay SW1 drops to 0V, so as to prevent the first relay SW1 from generating a momentary high voltage to burn out other components (such as the first switch Q1 in the following embodiments).
As an improvement to the above solution, as shown in fig. 3, the overvoltage detection module includes a first voltage regulator ZD1, a second resistor R2, a third resistor R3, and a first switch Q1;
the cathode of the first voltage regulator tube ZD1 is the control end of the overvoltage detection module 200, and the anode of the first voltage regulator tube ZD1 is connected with the first end of the second resistor R2;
a second end of the second resistor R2 is connected with a control end of the first switch tube Q1;
the input end of the first switch Q1 is the first end of the overvoltage detection module 200, and the output end of the first switch Q1 is the second end of the overvoltage detection module 200;
a first terminal of the third resistor R3 is connected to the control terminal of the first switch Q1, and a second terminal of the third resistor R3 is connected to the output terminal of the first switch Q1.
IN specific implementation, with reference to the above embodiment, the overvoltage detection module 200 is used to perform overvoltage judgment on the power supply voltage, and when the power supply voltage is greater than the preset high-voltage threshold VH, the first voltage regulator ZD1 operates IN a voltage stabilization region, and the first switch Q1 is turned on, so that the first relay SW1 is turned off to disconnect a power supply path from the circuit input terminal V _ IN to the circuit output terminal V _ OUT, thereby implementing overvoltage protection on the powered device; when the power supply voltage is not greater than the preset high-voltage threshold VH, the first voltage regulator tube ZD1 does not work in a voltage stabilizing region, the current flowing through the control end of the first switch tube Q1 is small, the first switch tube Q1 is turned off, so that the first relay SW1 is closed, and the power supply voltage is transmitted to the back-stage undervoltage protection circuit through the first relay SW1 to be correspondingly processed.
It should be noted that the first voltage regulator ZD1 is used to control a threshold value of overvoltage detection, that is, the above-mentioned high-voltage threshold VH; the second resistor R2 is a current limiting resistor for limiting the current flowing through the control terminal of the first switch transistor Q1; the third resistor R3 is a pull-down resistor, and is configured to provide a level to the control terminal of the first switch transistor Q1 when the first voltage regulator ZD1 does not operate in the voltage regulator region, so as to prevent the first switch transistor Q1 from being turned on by mistake; the first switch Q1 may be a transistor or a MOSFET, and is used to control the switch state of the first relay SW 1.
It can be understood that the first switching transistor Q1 may be a commonly used transistor, a MOS transistor, or other types of switching devices, and the embodiment of the present invention is not limited specifically, and the first switching transistor Q1 in fig. 3 is an NPN type transistor, where a control terminal of the first switching transistor Q1 is a base of the NPN type transistor, an input terminal of the first switching transistor Q1 is a collector of the NPN type transistor, and an output terminal of the first switching transistor Q1 is an emitter of the NPN type transistor.
The embodiment of the utility model provides an excessive pressure and undervoltage protection circuit through adjusting first stabilivolt and second resistance, can set up the size of high-pressure threshold value, realizes the nimble regulation of overvoltage protection point to the suitability of circuit has been improved.
As a modification of the above scheme, as shown in fig. 3, the undervoltage switch module 300 includes a second relay SW2, a fourth resistor R4 and a second diode D2;
a first end of the second relay SW2 is an input end of the under-voltage switch module 300, a second end of the second relay SW2 is an output end of the under-voltage switch module 300, a third end of the second relay SW2 is connected with a cathode of the second diode D2, and a fourth end of the second relay SW2 is a control end of the under-voltage switch module 300;
a first end of the fourth resistor R4 is connected to a first end of the second relay SW2, and a second end of the fourth resistor R4 is connected to a cathode of the second diode D2;
an anode of the second diode D2 is connected to the fourth terminal of the second relay SW 2.
IN specific implementation, with reference to the foregoing embodiment, when the power supply voltage is less than the preset low voltage threshold VL, the under-voltage detection module 400 is used to make the second relay SW2 IN an off state, so as to disconnect the power supply path from the circuit input terminal V _ IN to the circuit output terminal V _ OUT, thereby implementing under-voltage protection on the powered device; when the supply voltage is not less than the preset low voltage threshold VL, the second relay SW2 is in a closed state by the action of the under-voltage detection module 400, and the supply voltage is transmitted to the power input terminal of the powered device through the second relay SW 2.
It should be noted that the second relay SW2 corresponds to a switch, and is in an off state by default, and is used for controlling the on/off of the power supply path; the fourth resistor R4 is a voltage dividing resistor for preventing the control voltage between the third terminal and the fourth terminal of the second relay SW2 from being too high; the second diode D2 is a freewheeling diode for freewheeling when the control voltage between the third terminal and the fourth terminal of the second relay SW2 drops to 0V, and prevents the second relay SW2 from generating a momentary high voltage to burn out other components in the circuit (for example, the second switch Q2 in the following embodiments).
As an improvement to the above scheme, with reference to fig. 3, the undervoltage detection module 400 includes a second voltage regulator ZD2, a fifth resistor R5, a sixth resistor R6, and a second switch Q2;
the cathode of the second voltage regulator tube ZD2 is the control end of the under-voltage detection module 400, and the anode of the second voltage regulator tube ZD2 is connected with the first end of the fifth resistor R5;
a second end of the fifth resistor R5 is connected to a control end of the second switch transistor Q2;
the input end of the second switch tube Q2 is the first end of the under-voltage detection module 400, and the output end of the second switch tube Q2 is the second end of the under-voltage detection module 400;
a first end of the sixth resistor R6 is connected to the control end of the second switch Q2, and a second end of the sixth resistor R6 is connected to the output end of the second switch Q2.
IN specific implementation, with reference to the above embodiment, the undervoltage detection module 400 performs undervoltage judgment on the power supply voltage, and when the power supply voltage is smaller than the preset low-voltage threshold VL, the second voltage regulator ZD2 does not operate IN a voltage stabilization region, the current flowing through the control end of the second switch tube Q2 is small, and the second switch tube Q2 is turned off, so that the second relay SW2 is IN an off state to disconnect a power supply path from the circuit input end V _ IN to the circuit output end V _ OUT, thereby implementing undervoltage protection on the powered device; when the supply voltage is not less than the preset low voltage threshold VL, the second voltage regulator ZD2 works in the voltage regulator region, and the second switch tube Q2 is turned on, so that the second relay SW2 is in a closed state, and the supply voltage is transmitted to the power input end of the powered device through the second relay SW 2.
It should be noted that the second voltage regulator ZD2 is used to control a threshold value of the under-voltage detection, that is, the low-voltage threshold VL; the fifth resistor R5 is a current limiting resistor for limiting the current flowing through the control terminal of the second switch transistor Q2; the sixth resistor R6 is a pull-down resistor, and is configured to provide a level to the control terminal of the second switch transistor Q2 when the second regulator diode ZD2 does not operate in the regulated voltage region, so as to prevent the second switch transistor Q2 from being turned on by mistake; the second switch Q2 may be a transistor or a MOSFET for controlling the switch state of the second relay SW 2.
It can be understood that the second switching tube Q2 may be a commonly used transistor, a MOS transistor, or other types of switching devices, and the embodiment of the present invention is not limited specifically, and the second switching tube Q2 in fig. 3 is an NPN type transistor, where a control terminal of the second switching tube Q2 is a base of the NPN type transistor, an input terminal of the second switching tube Q2 is a collector of the NPN type transistor, and an output terminal of the second switching tube Q2 is an emitter of the NPN type transistor.
The embodiment of the utility model provides an excessive pressure and undervoltage protection circuit, through adjustment second stabilivolt and fifth resistance, can set up the size of low pressure threshold value, realizes the nimble regulation of undervoltage protection point to the suitability of circuit has been improved.
As a modification of the above solution, as shown in fig. 3, the overvoltage indication module 500 includes a seventh resistor R7 and a first light emitting diode LED 1;
a first end of the seventh resistor R7 is an input end of the overvoltage indication module 500, and a second end of the seventh resistor R7 is connected to an anode of the first light emitting diode LED 1;
the cathode of the first LED1 is the output of the overvoltage indication module 500.
In specific implementation, with reference to the above embodiment, when the supply voltage is greater than the preset high voltage threshold VH, the first voltage regulator ZD1 operates in the voltage regulation region, and the first switch Q1 is turned on, so that the first light emitting diode LED1 emits light to remind a user that the supply voltage is too high.
It should be noted that the seventh resistor R7 is a current limiting resistor, and is used for limiting the current flowing through the first light emitting diode LED 1; the first LED1 is used to indicate the voltage status of the circuit, and can distinguish the over-voltage status from the under-voltage status by the color of the emitted light, for example, a red LED is used to indicate the over-voltage status of the circuit.
As a modification to the above solution, as shown in fig. 3, the undervoltage indication module 600 includes an eighth resistor R8 and a second light emitting diode LED 2;
a first end of the eighth resistor R8 is an input end of the under-voltage indication module 600, and a second end of the eighth resistor R8 is connected to an anode of the second LED 2;
the cathode of the second LED2 is the output terminal of the under-voltage indication module 600.
In specific implementation, in combination with the above embodiments, when the power supply voltage is less than the preset low voltage threshold VL, the second voltage regulator ZD2 does not operate in the voltage stabilizing zone, and the second switch tube Q2 is turned off, so that the second light emitting diode LED2 emits light to remind a user that the power supply voltage is too low.
It should be noted that the eighth resistor R8 is a current limiting resistor, and is used for limiting the current flowing through the second light emitting diode LED 2; the second LED2 is used to indicate the voltage status of the circuit, and can distinguish the over-voltage status from the under-voltage status by the color of the light, for example, a yellow LED is used to indicate the under-voltage status of the circuit.
In other preferred embodiments, the overvoltage switch module comprises a third switch tube and a ninth resistor;
the first end of the third switching tube is the input end of the overvoltage switch module, the second end of the third switching tube is the output end of the overvoltage switch module, and the control end of the third switching tube is the control end of the overvoltage switch module;
the first end of the ninth resistor is connected with the first end of the third switching tube, and the second end of the ninth resistor is connected with the control end of the third switching tube.
In specific implementation, with the above embodiment, the on-off function of the overvoltage switch module can be realized through the third switching tube, and the third switching tube can be a switching device such as a triode or a MOSFET.
In other preferred embodiments, the undervoltage switching module comprises a fourth switching tube and a tenth resistor;
the first end of the fourth switching tube is the input end of the under-voltage switch module, the second end of the fourth switching tube is the output end of the under-voltage switch module, and the control end of the fourth switching tube is the control end of the under-voltage switch module;
and a first end of the tenth resistor is connected with a first end of the fourth switch tube, and a second end of the tenth resistor is connected with a control end of the fourth switch tube.
In specific implementation, by combining the above embodiment, the on-off function of the under-voltage switch module can be realized through the fourth switching tube, and the fourth switching tube can be a switching device such as a triode or a MOSFET.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.
Claims (11)
1. An overvoltage and undervoltage protection circuit is characterized by comprising a circuit input end, an overvoltage switch module, an overvoltage detection module, an undervoltage switch module, an undervoltage detection module and a circuit output end; wherein the content of the first and second substances,
the input end of the circuit is used for connecting a power supply; the circuit output end is used for connecting a power supply input end of the powered device;
the input end of the overvoltage switch module is connected with the input end of the circuit, the output end of the overvoltage switch module is connected with the input end of the undervoltage switch module, and the control end of the overvoltage switch module is connected with the first end of the overvoltage detection module;
the control end of the overvoltage detection module is connected with the input end of the circuit, and the second end of the overvoltage detection module is grounded;
the output end of the under-voltage switch module is connected with the output end of the circuit, and the control end of the under-voltage switch module is connected with the first end of the under-voltage detection module;
the control end of the undervoltage detection module is connected with the output end of the overvoltage switch module, and the second end of the undervoltage detection module is grounded.
2. The over-voltage and under-voltage protection circuit of claim 1, wherein the circuit further comprises an over-voltage indication module;
the input end of the overvoltage indication module is connected with the input end of the circuit, and the output end of the overvoltage indication module is connected with the first end of the overvoltage detection module.
3. The over-voltage and under-voltage protection circuit of claim 1, wherein the circuit further comprises an under-voltage indication module;
the input end of the undervoltage indication module is connected with the first end of the undervoltage detection module, and the output end of the undervoltage indication module is connected with the second end of the undervoltage detection module.
4. The over-voltage and under-voltage protection circuit of claim 1, wherein the over-voltage switch module comprises a first relay, a first resistor, and a first diode;
the first end of the first relay is the input end of the overvoltage switch module, the second end of the first relay is the output end of the overvoltage switch module, the third end of the first relay is connected with the cathode of the first diode, and the fourth end of the first relay is the control end of the overvoltage switch module;
a first end of the first resistor is connected with a first end of the first relay, and a second end of the first resistor is connected with a cathode of the first diode;
and the anode of the first diode is connected with the fourth end of the first relay.
5. The over-voltage and under-voltage protection circuit according to claim 1, wherein the over-voltage detection module comprises a first voltage regulator tube, a second resistor, a third resistor and a first switch tube;
the cathode of the first voltage-stabilizing tube is the control end of the overvoltage detection module, and the anode of the first voltage-stabilizing tube is connected with the first end of the second resistor;
the second end of the second resistor is connected with the control end of the first switching tube;
the input end of the first switch tube is the first end of the overvoltage detection module, and the output end of the first switch tube is the second end of the overvoltage detection module;
the first end of the third resistor is connected with the control end of the first switch tube, and the second end of the third resistor is connected with the output end of the first switch tube.
6. The overvoltage and undervoltage protection circuit of claim 1, wherein the undervoltage switch module comprises a second relay, a fourth resistor, and a second diode;
the first end of the second relay is the input end of the undervoltage switch module, the second end of the second relay is the output end of the undervoltage switch module, the third end of the second relay is connected with the cathode of the second diode, and the fourth end of the second relay is the control end of the undervoltage switch module;
a first end of the fourth resistor is connected with a first end of the second relay, and a second end of the fourth resistor is connected with a cathode of the second diode;
and the anode of the second diode is connected with the fourth end of the second relay.
7. The over-voltage and under-voltage protection circuit of claim 1, wherein the under-voltage detection module comprises a second voltage regulator tube, a fifth resistor, a sixth resistor and a second switch tube;
the cathode of the second voltage-stabilizing tube is the control end of the under-voltage detection module, and the anode of the second voltage-stabilizing tube is connected with the first end of the fifth resistor;
the second end of the fifth resistor is connected with the control end of the second switching tube;
the input end of the second switch tube is the first end of the under-voltage detection module, and the output end of the second switch tube is the second end of the under-voltage detection module;
the first end of the sixth resistor is connected with the control end of the second switch tube, and the second end of the sixth resistor is connected with the output end of the second switch tube.
8. The over-voltage and under-voltage protection circuit of claim 2, wherein the over-voltage indication module comprises a seventh resistor and a first light emitting diode;
the first end of the seventh resistor is the input end of the overvoltage indication module, and the second end of the seventh resistor is connected with the anode of the first light-emitting diode;
and the cathode of the first light-emitting diode is the output end of the overvoltage indication module.
9. The over-voltage and under-voltage protection circuit of claim 3, wherein the under-voltage indication module comprises an eighth resistor and a second light emitting diode;
the first end of the eighth resistor is the input end of the undervoltage indicating module, and the second end of the eighth resistor is connected with the anode of the second light-emitting diode;
and the cathode of the second light-emitting diode is the output end of the under-voltage indicating module.
10. The overvoltage and undervoltage protection circuit of claim 1, wherein the overvoltage switch module comprises a third switch tube and a ninth resistor;
the first end of the third switching tube is the input end of the overvoltage switch module, the second end of the third switching tube is the output end of the overvoltage switch module, and the control end of the third switching tube is the control end of the overvoltage switch module;
the first end of the ninth resistor is connected with the first end of the third switching tube, and the second end of the ninth resistor is connected with the control end of the third switching tube.
11. The overvoltage and undervoltage protection circuit of claim 1, wherein the undervoltage switching module comprises a fourth switching tube and a tenth resistor;
the first end of the fourth switching tube is the input end of the under-voltage switch module, the second end of the fourth switching tube is the output end of the under-voltage switch module, and the control end of the fourth switching tube is the control end of the under-voltage switch module;
and a first end of the tenth resistor is connected with a first end of the fourth switch tube, and a second end of the tenth resistor is connected with a control end of the fourth switch tube.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920941240.XU CN210608513U (en) | 2019-06-19 | 2019-06-19 | Overvoltage and undervoltage protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920941240.XU CN210608513U (en) | 2019-06-19 | 2019-06-19 | Overvoltage and undervoltage protection circuit |
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| CN210608513U true CN210608513U (en) | 2020-05-22 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022011596A1 (en) * | 2020-07-15 | 2022-01-20 | 深圳欣锐科技股份有限公司 | Isolation circuit, and isolation method |
| CN114844347A (en) * | 2022-06-30 | 2022-08-02 | 南京宏泰半导体科技有限公司 | Circuit and method for reducing power consumption of high-voltage tester power supply |
-
2019
- 2019-06-19 CN CN201920941240.XU patent/CN210608513U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022011596A1 (en) * | 2020-07-15 | 2022-01-20 | 深圳欣锐科技股份有限公司 | Isolation circuit, and isolation method |
| CN114844347A (en) * | 2022-06-30 | 2022-08-02 | 南京宏泰半导体科技有限公司 | Circuit and method for reducing power consumption of high-voltage tester power supply |
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