CN220289833U - Under-voltage and over-voltage detection locking indication circuit for power supply output voltage of ammeter - Google Patents
Under-voltage and over-voltage detection locking indication circuit for power supply output voltage of ammeter Download PDFInfo
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- CN220289833U CN220289833U CN202321719955.3U CN202321719955U CN220289833U CN 220289833 U CN220289833 U CN 220289833U CN 202321719955 U CN202321719955 U CN 202321719955U CN 220289833 U CN220289833 U CN 220289833U
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Abstract
The utility model discloses an undervoltage and overvoltage detection locking indication circuit of an ammeter power supply output voltage, and belongs to the field of detection tools. The undervoltage and overvoltage detection locking indication circuit of the power supply output voltage of the ammeter comprises a control chip, a voltage dividing circuit, an undervoltage and overvoltage indication circuit, an undervoltage alarm circuit, an overvoltage alarm circuit and an output voltage display circuit; the utility model uses the power supply to supply power, the output end of the power supply is connected with the test tool, and 2 potentiometers are arranged on the tool to adjust the upper limit voltage value and the lower limit voltage value of the detection voltage. When the abnormal state appears, by a plurality of warning functions, if the output voltage appears in the test process and exceeds upper limit or lower limit value, have corresponding LED to send red light, have buzzer warning simultaneously, have voltage locking function, the LED can instruct the bad condition of taking place to be under-voltage or excessive pressure, and the frock board can also connect display module, can direct display current voltage.
Description
Technical Field
The utility model relates to the field of detection tools, in particular to an undervoltage and overvoltage detection locking indication circuit for the power supply output voltage of an ammeter.
Background
The existing power supply products have EMC requirements, have some high-voltage or high-current test items, such as lightning surge/group pulse/static and other test items, and are inconvenient to monitor output voltage in the test process, and the conventional method is that if the products with display screens are stared at the test screens by eyes, people feel very hard and take time, short power failure cannot be found in time, products without display screens are powered on after the test, whether the power supply output is normal is judged, and if the power failure restarting condition occurs in the test process, the situation cannot be found.
Disclosure of Invention
The utility model aims to: an undervoltage and overvoltage detection locking indication circuit for an ammeter power supply output voltage is provided, so that the problems existing in the prior art are solved.
The technical scheme is as follows: the undervoltage and overvoltage detection locking indication circuit for the power supply output voltage of the ammeter comprises a control chip, a voltage dividing circuit, an undervoltage and overvoltage indication circuit, an undervoltage alarm circuit, an overvoltage alarm circuit and an output voltage display circuit;
wherein the 1 st pin of the control chip is respectively connected with an undervoltage and overvoltage indicating circuit and an overvoltage alarm circuit, the 2 nd pin of the control chip is connected with a voltage dividing circuit and a COM port of a switch K1, the NC port of the switch K1 is connected with the reverse output voltage of a power supply, the ON end of the switch K1 is connected with the overvoltage alarm circuit, the 3 rd pin of the control chip is respectively connected with one end of a capacitor C3 and one end of a resistor R7, the other end of the capacitor C3 is connected with the reverse output voltage of the power supply, the 4 th pin of the control chip is connected with the reverse output voltage of the power supply, the 5 th pin of the control chip is respectively connected with the voltage dividing circuit and the COM port of the switch K2, the NC port of the switch K2 is connected with the voltage dividing circuit, the ON port of the K2 is connected with the anode of a diode D7, the cathode of the diode D7 is connected with the cathode of the diode D2, the 6 th pin of the control chip is respectively connected with one end of a capacitor C3 and one end of a resistor R7, the other end of the resistor R7 is connected with the overvoltage alarm circuit, the 7 th pin of the control chip is respectively connected with the cathode of a diode D2, an undervoltage overvoltage indication circuit and one end of a resistor R8, the anode of the diode D2 is connected with the undervoltage overvoltage indication circuit, the other end of the resistor R8 is connected with the undervoltage alarm circuit, the 8 th pin of the control chip is divided into two paths, the first path is connected with one end of the resistor R3, the second path is grounded after passing through the capacitor C2, the other end of the resistor R3 is divided into two paths, the first path is connected with the undervoltage overvoltage indication circuit, the second path is connected with the voltage divider circuit through the diode D1, the undervoltage alarm circuit is electrically connected with the overvoltage alarm circuit, the other end of the resistor R8 is connected with the cathode of a buzzer BZ1, and the anode of the buzzer BZ1 is connected with the output voltage display circuit.
Further, the voltage dividing circuit comprises a potentiometer RP1, a potentiometer RP2, a voltage dividing resistor R1 and a voltage dividing resistor R2, one end of the potentiometer RP1 is connected with one end of the voltage dividing resistor R1 and then connected with a 2 nd pin of the control chip, the other end of the potentiometer RP1 is divided into two paths, the first path is grounded through a capacitor C1, the second path is connected with a forward output voltage, one end of the potentiometer RP2 is connected with one end of the voltage dividing resistor R2 and then connected with a COM port of the switch K2, the other end of the potentiometer RP2 is respectively connected with an NC port of the switch K2 and the other end of the potentiometer RP1, and the other end of the potentiometer R1 is connected with the other end of the voltage dividing resistor R2 and then connected with a reverse output voltage of a power supply.
Further, the undervoltage and overvoltage indication circuit comprises a diode D3, a diode D4, a resistor R4, a diode D5, a resistor R5, a diode D6 and a resistor R6, wherein the cathode of the diode D3 is connected with the cathode of the diode D5 and then connected with the 1 st pin of the control chip, the anode of the diode D3 is connected with the anode of the diode D2, the anode of the diode D3 is further divided into two paths, the first path is connected with the undervoltage alarm circuit after passing through the resistor R4, the second path is grounded after passing through the diode D4, the anode of the diode D5 is connected with the undervoltage alarm circuit after passing through the current limiting resistor R5, the cathode of the diode D6 is connected with one end of the resistor R8, and the anode of the diode D6 is connected with the undervoltage alarm circuit through the resistor R6.
Further, the under-voltage alarm circuit comprises a resistor R9 and a triode Q1, the resistor R9 is respectively connected with the other end of the resistor R8 and the base electrode of the triode Q1, the collector electrode of the triode Q1 is divided into two paths, the first path is connected with the collector electrode of the triode Q5 through a resistor R12, the second path is connected with the base electrode of the triode Q2 through a resistor R14, the emitter electrode of the triode Q2 is connected with the other end of the resistor R9 and the emitter electrode of the triode Q1 and is grounded, the collector electrode of the triode Q2 is divided into two paths, the first path is connected with the collector electrode of the triode Q5 through a resistor R13, and the second path is connected with the cathode electrode of the diode D9.
Further, the overvoltage alarm circuit comprises a resistor R10 and a triode Q3, one end of the resistor R10 is connected with the 1 st pin of the control chip, the other end of the resistor R10 is divided into two paths, the first path is connected with one end of a resistor R11, the second path is connected with the base electrode of the triode Q3, the other end of the resistor R11 is respectively connected with a reverse output voltage and the emitting electrode of the triode Q3, the emitting electrode of the triode Q3 is grounded, the collecting electrode of the triode Q3 is respectively connected with one end of a resistor R19, one end of a resistor R15, one end of a resistor R17 and the anode of a diode D8, the other end of the resistor R19 is respectively connected with the other end of the resistor R15, the other end of the resistor R7 and one end of the resistor R16 after being connected, the cathode of the diode D8 is connected with the ON end of the switch K1, the other end of the resistor R17 is connected with the base electrode of the triode Q4, the reverse output voltage of the emitting electrode Q4 is connected with the power supply, the collecting electrode of the triode Q4 is respectively connected with one end of the resistor R15, the other end of the collector of the resistor R16 is connected with the diode D10, and the other end of the diode D10 is connected with the cathode of the display circuit.
Further, the output voltage display circuit includes a triode Q5, a collector of the triode Q5 and one end of the resistor R18 are connected to the 3 rd pin of the socket J1 and the 2 nd pin of the socket J1, and the 4 th pin of the socket J1 is connected to the VOUT pin. The under-voltage alarm circuit is connected after connection, the other end of the resistor R18 is connected with the base electrode of the triode Q5 and then connected with the cathode of the diode D11, the anode of the diode D11 is divided into three paths, the first path is grounded, the second path is connected with one end of the capacitor C5, the third path is connected with the 2 nd pin of the socket J1, the other end of the capacitor C5 is connected with the emitter electrode of the triode Q5 and then connected with the 1 st pin of the socket J1, and the 1 st pin of the socket J1 is also connected with the anode of the buzzer BZ 1.
Further, pin 3 of the socket J1 is connected to pin 2 of the socket J1, and pin 4 of the socket J1 is connected to pin VOUT.
Furthermore, the VOUT pin is disposed before the capacitor C1 and the forward output voltage, and the GND pin is disposed before the divider resistor R1 and the reverse output voltage.
The beneficial effects are that: the utility model uses the power supply to supply power, the output end of the power supply is connected with the testing tool, 2 potentiometers are arranged on the tool, the upper limit voltage value and the lower limit voltage value of the detection voltage can be adjusted, and the change condition of the output voltage can be confirmed at any time in the testing process of the high-voltage and high-current test items. When the abnormal state appears, by a plurality of warning functions, if the output voltage appears in the test process and exceeds upper limit or lower limit value, have corresponding LED to send red light, have buzzer warning simultaneously, have voltage locking function, the LED can instruct the bad condition of taking place to be under-voltage or excessive pressure, and the frock board can also connect display module, can direct display current voltage. The product can be found in time when the product is abnormal. And the device has the functions of under-voltage and over-voltage locking, and can lock abnormal conditions when over-voltage or under-voltage occurs in the test process. The voltage output of the power supply is randomly monitored, so that labor is saved, and the working efficiency is improved.
Drawings
FIG. 1 is a circuit diagram of an undervoltage and overvoltage detection lock indication circuit for an ammeter power supply output voltage.
Fig. 2 is a schematic diagram of the operation of the lock indication circuit for detecting the undervoltage and overvoltage of the power output voltage of the ammeter according to the present utility model.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present utility model. It will be apparent, however, to one skilled in the art that the utility model may be practiced without one or more of these details. In other instances, well-known features have not been described in detail in order to avoid obscuring the utility model.
As shown in fig. 1 to 2, an undervoltage and overvoltage detection locking indication circuit for the output voltage of an ammeter power supply comprises a control chip, a voltage dividing circuit, an undervoltage and overvoltage indication circuit, an undervoltage alarm circuit, an overvoltage alarm circuit and an output voltage display circuit;
wherein the 1 st pin of the control chip is respectively connected with an undervoltage and overvoltage indicating circuit and an overvoltage alarm circuit, the 2 nd pin of the control chip is connected with a voltage dividing circuit and a COM port of a switch K1, the NC port of the switch K1 is connected with the reverse output voltage of a power supply, the ON end of the switch K1 is connected with the overvoltage alarm circuit, the 3 rd pin of the control chip is respectively connected with one end of a capacitor C3 and one end of a resistor R7, the other end of the capacitor C3 is connected with the reverse output voltage of the power supply, the 4 th pin of the control chip is connected with the reverse output voltage of the power supply, the 5 th pin of the control chip is respectively connected with the voltage dividing circuit and the COM port of the switch K2, the NC port of the switch K2 is connected with the voltage dividing circuit, the ON port of the K2 is connected with the anode of a diode D7, the cathode of the diode D7 is connected with the cathode of the diode D2, the 6 th pin of the control chip is respectively connected with one end of a capacitor C3 and one end of a resistor R7, the other end of the resistor R7 is connected with the overvoltage alarm circuit, the 7 th pin of the control chip is respectively connected with the cathode of a diode D2, an undervoltage overvoltage indication circuit and one end of a resistor R8, the anode of the diode D2 is connected with the undervoltage overvoltage indication circuit, the other end of the resistor R8 is connected with the undervoltage alarm circuit, the 8 th pin of the control chip is divided into two paths, the first path is connected with one end of the resistor R3, the second path is grounded after passing through the capacitor C2, the other end of the resistor R3 is divided into two paths, the first path is connected with the undervoltage overvoltage indication circuit, the second path is connected with the voltage divider circuit through the diode D1, the undervoltage alarm circuit is electrically connected with the overvoltage alarm circuit, the other end of the resistor R8 is connected with the cathode of a buzzer BZ1, and the anode of the buzzer BZ1 is connected with the output voltage display circuit.
In this embodiment, the 1 st pin of the control chip is connected to the overvoltage indication circuit portion in the undervoltage overvoltage indication circuit, and the 7 th pin of the control chip is connected to the undervoltage indication circuit portion in the undervoltage overvoltage indication circuit.
The voltage dividing circuit comprises a potentiometer RP1, a potentiometer RP2, a voltage dividing resistor R1 and a voltage dividing resistor R2, wherein one end of the potentiometer RP1 is connected with one end of the voltage dividing resistor R1 and then connected with a 2 nd pin of the control chip, the other end of the potentiometer RP1 is divided into two paths, the first path is grounded through a capacitor C1, the second path is connected with a forward output voltage, one end of the potentiometer RP2 is connected with one end of the voltage dividing resistor R2 and then connected with a COM port of the switch K2, the other end of the potentiometer RP2 is respectively connected with an NC port of the switch K2 and the other end of the potentiometer RP1, and the other end of the potentiometer R1 is connected with the other end of the voltage dividing resistor R2 and then connected with a reverse output voltage of a power supply.
The undervoltage and overvoltage indication circuit comprises a diode D3, a diode D4, a resistor R4, a diode D5, a resistor R5, a diode D6 and a resistor R6, wherein the cathode of the diode D3 is connected with the cathode of the diode D5 and then connected with the 1 st pin of the control chip, the anode of the diode D3 is connected with the anode of the diode D2, the anode of the diode D3 is further divided into two paths, the first path is connected with the undervoltage alarm circuit after passing through the resistor R4, the second path is grounded after passing through the diode D4, the anode of the diode D5 is connected with the undervoltage alarm circuit after passing through the current limiting resistor R5, the cathode of the diode D6 is connected with one end of the resistor R8, and the anode of the diode D6 is connected with the undervoltage alarm circuit through the resistor R6.
The under-voltage alarm circuit comprises a resistor R9 and a triode Q1, wherein the resistor R9 is respectively connected with the other end of the resistor R8 and the base electrode of the triode Q1, the collector electrode of the triode Q1 is divided into two paths, the first path is connected with the collector electrode of the triode Q5 through a resistor R12, the second path is connected with the base electrode of the triode Q2 through a resistor R14, the emitter electrode of the triode Q2 is connected with the other end of the resistor R9 and the emitter electrode of the triode Q1 and grounded, the collector electrode of the triode Q2 is divided into two paths, the first path is connected with the collector electrode of the triode Q5 through a resistor R13, and the second path is connected with the cathode electrode of the diode D9.
The overvoltage alarm circuit comprises a resistor R10 and a triode Q3, one end of the resistor R10 is connected with a 1 st pin of the control chip, the other end of the resistor R10 is divided into two paths, the first path is connected with one end of a resistor R11, the second path is connected with a base electrode of the triode Q3, the other end of the resistor R11 is respectively connected with a reverse output voltage and an emitter electrode of the triode Q3, the emitter electrode of the triode Q3 is grounded, a collector electrode of the triode Q3 is respectively connected with one end of a resistor R19, one end of a resistor R15, one end of a resistor R17 and an anode of a diode D8, the other end of the resistor R19 is respectively connected with the other end of the resistor R15 and one end of a resistor R16 after being connected, a cathode of the diode D8 is connected with an ON end of a switch K1, the other end of the resistor R17 is connected with a base electrode of a triode Q4, an emitter electrode of the triode Q4 is connected with a reverse output voltage of a power supply, the other end of the triode Q4 is respectively connected with two paths, the other end of the resistor R16 is connected with the collector electrode of the diode D10, and the other end of the diode D is connected with the display circuit.
The output voltage display circuit comprises a triode Q5, wherein a collector electrode of the triode Q5 is connected with one end of a resistor R18 and then is connected with the under-voltage alarm circuit, the other end of the resistor R18 is connected with a base electrode of the triode Q5 and then is connected with a cathode of a diode D11, an anode of the diode D11 is divided into three paths, a first path is grounded, a second path is connected with one end of a capacitor C5, a third path is connected with a 2 nd pin of a socket J1, the other end of the capacitor C5 is connected with an emitter electrode of the triode Q5 and then is connected with a 1 st pin of the socket J1, and the 1 st pin of the socket J1 is also connected with an anode of a buzzer BZ 1.
The 3 rd pin of the socket J1 is connected with the 2 nd pin of the socket J1, and the 4 th pin of the socket J1 is connected with the VOUT pin.
And a VOUT pin is arranged before the capacitor C1 and the forward output voltage, and a GND pin is arranged before the divider resistor R1 and the reverse output voltage.
The OVP overpressure indication function works as follows:
the 1 st pin, the 2 nd pin and the 3 rd pin of the control chip are a group of overvoltage comparators, the output voltage of the power supply is divided by a potentiometer RP1 and a lower divider resistor R1 and then is connected to the 2 nd pin of the control chip, the 2 nd pin of the control chip is the reverse input end of the overvoltage comparator, the 3 rd pin of the control chip is the forward input end of the overvoltage comparator and is also the reference voltage, the voltage of the 2 nd pin of the control chip is stabilized at 2.5V, the potentiometer RP1 is regulated, when the output voltage is at the upper limit of the voltage, the voltage of the 2 nd pin of the control chip is 2.5V, when the output voltage is higher than the upper limit of the voltage, the voltage of the 2 nd pin of the control chip is higher than 2.5V, because the 2 nd pin of the control chip is the reverse input end of the overvoltage comparator, when the reverse input voltage of the overvoltage comparator is higher than the positive input voltage Vin- > vin+, the output end of the 1 st pin of the overvoltage comparator outputs low voltage, the 1 st pin of the overvoltage comparator is connected with the cathode of the diode D3/D5 and the resistor R10, the voltage of the anode of the diode D4 is pulled down through the diode D3, the diode D4 is not lightened, the anode of the diode D5 is connected with the power supply output through the current limiting resistor R5, at the moment, the cathode of the diode D5 is low voltage, the diode D5 emits red light, the resistor R10 is connected with the base electrode of the triode Q3 and also is low voltage, the triode Q3 is cut off, the power supply provides base voltage for the triode Q4 through the resistor R15/R19/R17, the triode Q4 is conducted, the cathode of the diode D10 is pulled to low voltage, the anode of the buzzer BZ1 is connected with 5V voltage after the voltage is stabilized through the resistor R18/the triode Q5/the diode D11, at the moment, the buzzer BZ1 can emit alarming sound,
the UVP under-voltage indication function works as follows:
the 5 th pin, the 6 th pin and the 7 th pin of the control chip are a group of undervoltage comparators, the output voltage of the power supply is divided by a potentiometer RP2 and a lower divider resistor R2 and then is connected to the 5 th pin of the undervoltage comparator, the 5 th pin of the control chip is a positive input end of the undervoltage comparator, the 6 th pin of the control chip is a negative input end of the undervoltage comparator and is connected with the 3 rd pin of the overvoltage comparator, the reference voltage of the group of comparators is stabilized at 2.5V, the potentiometer RP2 is regulated, when the output voltage is at the lower limit of the voltage, the voltage of the 5 th pin of the undervoltage comparator is 2.5V, when the output voltage is lower than the lower limit of the voltage, the voltage of the 5 th pin of the undervoltage comparator is lower than 2.5V, because the 5 th pin is a positive input end of the undervoltage comparator, when the reverse input voltage of the undervoltage comparator is higher than positive input voltage Vin- > vin+, the output end of the 7 th pin of the undervoltage comparator outputs low voltage, the 7 th pin of the undervoltage comparator is connected to the cathode of the diode D2/D6 and the resistor R8, the voltage of the anode of the diode D4 is pulled down through the diode D2, the diode D4 is not lightened, the anode of the diode D6 is connected with the power supply output through the current limiting resistor R5, the cathode of the diode D6 is low voltage, the diode D6 emits red light, the resistor R8 is connected with the base of the triode Q1 and also is low voltage, the triode Q1 is cut off, the power supply provides base voltage for the triode Q2 through the resistor R12/R14, the triode Q2 is conducted, the cathode of the diode D9 is pulled to low voltage, the anode of the buzzer BZ1 is connected with 5V voltage after being pressed through the resistor R18/the triode Q5/the diode D11, the buzzer can emit alarming sound at the moment,
the normal operating state is as follows:
when the output voltage is between the upper limit voltage and the lower limit voltage, the voltage of the 2 nd pin of the overvoltage comparator and the voltage of the 5 th pin of the undervoltage comparator are 2.5V, and the two groups of comparators are vin+ and vin+. The voltage of the 1 st pin of the output pin of the overvoltage comparator and the voltage of the 7 th pin of the output pin of the undervoltage comparator both output high voltage, the diode D2/D3/D5/D6 is reversely cut off, and the diode D5/D6 is not lightened. The positive pole of diode D4 connects the power through current limiting resistor R5, and the negative pole ground connection, diode D4 switches on and sends green light, and resistance R8 and resistance R10 also connect high voltage, and triode Q1 switches on with triode Q3, draws collector voltage low, and triode Q2 and triode Q4's base be low-voltage and cut off, and buzzer BZ 1's negative pole just can not send the warning sound for high voltage.
The OVP overpressure locking function is as follows:
when the switch K1 is driven to the position of the ON pin, the 2 nd pin of the overvoltage comparator is connected to the collector electrode of the triode Q3 through the switch K1/the diode D8, when overvoltage occurs, the triode Q3 is cut off, the collector electrode is high voltage, the 2 nd pin of the overvoltage comparator is pulled to high voltage through the diode D8/the switch K1, the voltage of the 2 nd pin of the overvoltage comparator is higher than 2.5V, vin < - > Vin < + > test fixture indicates that the power supply output is always in an overvoltage state, at the moment, even if the output voltage is restored to be in a normal range, the state of the comparator is not changed, the comparator can be locked in the overvoltage state, the locking function is cancelled, the switch is only required to be driven to the middle position, if the overvoltage condition is not required to be seen, the switch can be driven to the position of the NC pin, and the 2 nd pin of the overvoltage comparator is grounded through the switch.
The UVP under-voltage locking function is as follows:
when the switch K2 is switched to the position of the ON pin, the 5 th pin of the undervoltage comparator is connected to the 7 th pin of the undervoltage comparator through the switch K2/the diode D7, when undervoltage occurs, the 7 th pin of the undervoltage comparator outputs low voltage, the 5 th pin of the undervoltage comparator is pulled to low voltage through the switch D7/K2, the voltage of the 5 th pin of the undervoltage comparator is lower than 2.5V, vin < - > Vin < + >, the test work indicates that the power supply output is always in the undervoltage state, at the moment, even if the output voltage is restored to be in a normal range, the state of the comparator is not changed, the state can be locked in the undervoltage state, the locking function is cancelled only by switching the switch to the middle position, if the situation does not need to be seen, the switch can be switched to the NC pin position, and the 5 th pin of the undervoltage comparator is connected with the output anode of the undervoltage through the switch K2.
The voltage display function is as follows:
the socket J1 is a 4PIN socket, the 1 st PIN of the socket J1 is 5V voltage after the power supply is stabilized through a resistor R18/a triode Q5/a diode D11, the 2/3 nd PIN of the socket J1 is grounded, the 4 th PIN of the socket J1 is used for outputting the voltage end, a display module with 5V power supply is used for supplying power, the 1 st PIN of the socket J1 is connected with 5V, the 4 th PIN output end is displayed, and the 2/3 nd PIN of the public terminal socket J1 can display the voltage value of the power supply at output.
The preferred embodiments of the present utility model have been described in detail above with reference to the accompanying drawings, but the present utility model is not limited to the specific details of the above embodiments, and various equivalent changes can be made to the technical solutions of the present utility model within the scope of the technical concept of the present utility model, and these equivalent changes all fall within the scope of the present utility model.
Claims (8)
1. The undervoltage and overvoltage detection locking indication circuit for the power supply output voltage of the ammeter is characterized by comprising a control chip, a voltage dividing circuit, an undervoltage and overvoltage indication circuit, an undervoltage alarm circuit, an overvoltage alarm circuit and an output voltage display circuit;
wherein the 1 st pin of the control chip is respectively connected with an undervoltage and overvoltage indicating circuit and an overvoltage alarm circuit, the 2 nd pin of the control chip is connected with a voltage dividing circuit and a COM port of a switch K1, the NC port of the switch K1 is connected with the reverse output voltage of a power supply, the ON end of the switch K1 is connected with the overvoltage alarm circuit, the 3 rd pin of the control chip is respectively connected with one end of a capacitor C3 and one end of a resistor R7, the other end of the capacitor C3 is connected with the reverse output voltage of the power supply, the 4 th pin of the control chip is connected with the reverse output voltage of the power supply, the 5 th pin of the control chip is respectively connected with the voltage dividing circuit and the COM port of the switch K2, the NC port of the switch K2 is connected with the voltage dividing circuit, the ON port of the K2 is connected with the anode of a diode D7, the cathode of the diode D7 is connected with the cathode of the diode D2, the 6 th pin of the control chip is respectively connected with one end of a capacitor C3 and one end of a resistor R7, the other end of the resistor R7 is connected with the overvoltage alarm circuit, the 7 th pin of the control chip is respectively connected with the cathode of a diode D2, an undervoltage overvoltage indication circuit and one end of a resistor R8, the anode of the diode D2 is connected with the undervoltage overvoltage indication circuit, the other end of the resistor R8 is connected with the undervoltage alarm circuit, the 8 th pin of the control chip is divided into two paths, the first path is connected with one end of the resistor R3, the second path is grounded after passing through the capacitor C2, the other end of the resistor R3 is divided into two paths, the first path is connected with the undervoltage overvoltage indication circuit, the second path is connected with the voltage divider circuit through the diode D1, the undervoltage alarm circuit is electrically connected with the overvoltage alarm circuit, the other end of the resistor R8 is connected with the cathode of a buzzer BZ1, and the anode of the buzzer BZ1 is connected with the output voltage display circuit.
2. The under-voltage and over-voltage detection locking indication circuit of the power supply output voltage of the ammeter according to claim 1, wherein the voltage dividing circuit comprises a potentiometer RP1, a potentiometer RP2, a voltage dividing resistor R1 and a voltage dividing resistor R2, one end of the potentiometer RP1 is connected with one end of the voltage dividing resistor R1 and then is connected with a 2 nd pin of the control chip, the other end of the potentiometer RP1 is divided into two paths, the first path is grounded through a capacitor C1, the second path is connected with a forward output voltage, one end of the potentiometer RP2 is connected with one end of the voltage dividing resistor R2 and then is connected with a COM port of the switch K2, the other end of the potentiometer RP2 is respectively connected with an NC port of the switch K2 and the other end of the potentiometer RP1, and the other end of the voltage dividing resistor R2 is connected with a reverse output voltage of the power supply.
3. The under-voltage and over-voltage detection locking indication circuit of the power supply output voltage of the ammeter according to claim 2, wherein the under-voltage and over-voltage detection locking indication circuit comprises a diode D3, a diode D4, a resistor R4, a diode D5, a resistor R5, a diode D6 and a resistor R6, wherein a cathode of the diode D3 is connected with a cathode of the diode D5 and then is connected with a 1 st pin of the control chip, an anode of the diode D3 is connected with an anode of the diode D2, the anode of the diode D3 is further divided into two paths, a first path is connected with the under-voltage alarm circuit after passing through the resistor R4, a second path is grounded after passing through the diode D4, an anode of the diode D5 is connected with the under-voltage alarm circuit after passing through the current limiting resistor R5, a cathode of the diode D6 is connected with one end of the resistor R8, and an anode of the diode D6 is connected with the under-voltage alarm circuit through the resistor R6.
4. The under-voltage and over-voltage detection locking indication circuit of the power supply output voltage of the electricity meter according to claim 3, wherein the under-voltage alarm circuit comprises a resistor R9 and a triode Q1, the resistor R9 is respectively connected with the other end of the resistor R8 and the base electrode of the triode Q1, the collector electrode of the triode Q1 is divided into two paths, the first path is connected with the collector electrode of the triode Q5 through a resistor R12, the second path is connected with the base electrode of the triode Q2 through a resistor R14, the emitter electrode of the triode Q2 is connected with the other end of the resistor R9 and the emitter electrode of the triode Q1 and is grounded, the collector electrode of the triode Q2 is divided into two paths, the first path is connected with the collector electrode of the triode Q5 through a resistor R13, and the second path is connected with the cathode electrode of the diode D9.
5. The under-voltage and over-voltage detection locking indication circuit of an ammeter power supply output voltage according to claim 4, wherein the over-voltage alarm circuit comprises a resistor R10 and a triode Q3, one end of the resistor R10 is connected with a 1 st pin of the control chip, the other end of the resistor R10 is divided into two paths, a first path is connected with one end of a resistor R11, a second path is connected with a base electrode of the triode Q3, the other end of the resistor R11 is respectively connected with a reverse output voltage and an emitter electrode of the triode Q3, the emitter electrode of the triode Q3 is grounded, a collector electrode of the triode Q3 is respectively connected with one end of a resistor R19, one end of a resistor R15, one end of a resistor R17 and an anode electrode of a diode D8, the other end of the resistor R19 is connected with the other end of the resistor R15, the other end of the resistor R7 is respectively connected with one end of the resistor R16, a cathode of the diode D8 is connected with an ON end of the switch K1, the other end of the resistor R17 is connected with a base electrode of the triode Q4, a collector electrode of the triode Q4 is respectively connected with the output voltage of the second path 10, and the other end of the triode D is connected with the triode D10.
6. The circuit for locking and detecting the undervoltage and the overvoltage of the power supply output voltage of the electricity meter according to claim 5, wherein the output voltage display circuit comprises a triode Q5, a collector of the triode Q5 is connected with one end of a resistor R18 and then is connected with an undervoltage alarm circuit, the other end of the resistor R18 is connected with a base of the triode Q5 and then is connected with a cathode of a diode D11, an anode of the diode D11 is divided into three paths, a first path is grounded, a second path is connected with one end of a capacitor C5, a third path is connected with a 2 nd pin of a socket J1, the other end of the capacitor C5 is connected with an emitter of the triode Q5 and then is connected with a 1 st pin of the socket J1, and the 1 st pin of the socket J1 is also connected with an anode of the buzzer BZ 1.
7. The circuit of claim 6, wherein pin 3 of the socket J1 is connected to pin 2 of the socket J1, and pin 4 of the socket J1 is connected to pin VOUT.
8. The circuit of claim 7, wherein VOUT pin is provided before the capacitor C1 and the forward output voltage, and GND pin is provided before the voltage dividing resistor R1 and the reverse output voltage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321719955.3U CN220289833U (en) | 2023-07-03 | 2023-07-03 | Under-voltage and over-voltage detection locking indication circuit for power supply output voltage of ammeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321719955.3U CN220289833U (en) | 2023-07-03 | 2023-07-03 | Under-voltage and over-voltage detection locking indication circuit for power supply output voltage of ammeter |
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| CN220289833U true CN220289833U (en) | 2024-01-02 |
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|---|---|---|---|
| CN202321719955.3U Active CN220289833U (en) | 2023-07-03 | 2023-07-03 | Under-voltage and over-voltage detection locking indication circuit for power supply output voltage of ammeter |
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| Country | Link |
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| CN (1) | CN220289833U (en) |
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2023
- 2023-07-03 CN CN202321719955.3U patent/CN220289833U/en active Active
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