CN220673428U - Automatic control early warning protection circuit and device for undervoltage surge and low voltage - Google Patents
Automatic control early warning protection circuit and device for undervoltage surge and low voltage Download PDFInfo
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- 239000003990 capacitor Substances 0.000 abstract description 6
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Abstract
The utility model discloses an under-voltage surge and low-voltage automatic control early warning protection circuit and device, which mainly solve the problems that the capacity of the existing energy storage capacitor is usually larger, the impact current is very large during power-on starting, and a large number of electronic elements are very easy to damage and unstable in function in the prior art. The automatic control early warning protection circuit for undervoltage surge and low voltage comprises a voltage division window selection unit connected with a power supply, wherein the voltage division window selection unit is connected with a monitoring and control unit in a communication manner; the first control end of the monitoring and control unit is respectively connected with the input end of the first partial pressure control unit and the input end of the second partial pressure control unit; the output end of the first voltage division control unit and the output end of the second voltage division control unit are connected with a load. Through the scheme, the utility model effectively solves the problem of undervoltage power supply of the system and achieves the purposes of stable power supply and intelligent monitoring.
Description
Technical Field
The utility model relates to the technical field of under-voltage surge and low-voltage protection, in particular to an automatic control early warning protection circuit and device for under-voltage surge and low voltage.
Background
Under-voltage surge and low voltage widely exist in a power supply system, and when the voltage of electric equipment is lower than a certain value, the equipment cannot work normally; in the traditional scheme for solving the undervoltage surge, there is a mode of adding an energy storage capacitor to solve the undervoltage surge; the capacity of the energy storage capacitor is usually larger, so that the impact current is very large during power-on starting, a large number of electronic elements are very easily damaged, and the circuit function is unstable.
Disclosure of Invention
The utility model aims to provide an under-voltage surge and low-voltage automatic control early warning protection circuit and device, which are used for solving the problems that the capacity of the existing energy storage capacitor is usually relatively large, the impact current is very large during power-on starting, and a large number of electronic elements are very easy to damage and unstable in function.
In order to solve the problems, the utility model provides the following technical scheme:
on the one hand, the automatic control early warning protection circuit for undervoltage surge and low voltage comprises a voltage division window selection unit connected with a power supply, wherein the voltage division window selection unit is mutually connected with a monitoring and control unit in a communication way; the first control end of the monitoring and control unit is respectively connected with the input end of the first partial pressure control unit and the input end of the second partial pressure control unit; the output end of the first voltage division control unit and the output end of the second voltage division control unit are connected with a load.
In a preferred embodiment, the under-voltage surge and low-voltage automatic control early warning protection circuit further comprises an under-voltage early warning unit, wherein two input ends of the under-voltage early warning unit are respectively connected with the control end of the voltage dividing window selection unit and the second control end of the monitoring and control unit.
In a preferred embodiment, the under-voltage early warning unit comprises a resistor R11 and a Light Emitting Diode (LED) 1 which are sequentially connected in series with the voltage dividing window selection unit, and a resistor R12 and a Light Emitting Diode (LED) 2 which are sequentially connected in series with the monitoring and control unit; the resistor R11 and the light emitting diode LED1 are connected in series and then connected in parallel with the resistor R12 and the light emitting diode LED2, and are connected with the negative end of the power supply after being connected in parallel.
In a preferred embodiment, the voltage dividing window selecting unit comprises a resistor R1 and a resistor R2 which are respectively connected with the positive terminal and the negative terminal of the power supply; the connecting line of the resistor R1 and the resistor R2 is sequentially provided with two nodes, the node close to the resistor R1 is a, the node is connected with the inverting input end of the comparator IC1, and the node close to the resistor R2 is connected with the non-inverting input end of the comparator IC 2; the reference voltage of the comparator IC1 is VREF1, and the reference voltage of the comparator IC2 is VREF2; the output ends of the comparator IC1 and the comparator IC2 are respectively connected with the monitoring and control unit.
In a preferred embodiment, the monitoring and control unit comprises a rechargeable battery BAT, a resistor R9, an anode of a diode D2 and a resistor R3; the output end of the comparator IC1 is sequentially connected with the anode of the diode D2 and the resistor R3 in series and then connected with the first voltage division control unit, and the junction of the comparator IC1 and the diode D2 is connected with the resistor R11;
the monitoring and control unit also comprises a voltage stabilizing tube D4 and a resistor R4 which are connected in parallel; one end of a cathode of the voltage stabilizing tube D4 and one end of the resistor R4 are connected with a node of the resistor R3 and the first voltage division control unit and then connected with the second voltage division control unit; the anode of the voltage stabilizing tube D4 and the other end of the resistor R4 are connected with the first voltage division control unit and then connected with the negative electrode of the power supply;
the output end of the comparator IC2 is connected with the first input end of the NAND gate IC4, and the node of the comparator IC2 and the first input end is e; the output end of the NAND gate IC4 is sequentially connected with the anode of a diode D3, a diode D2 and a node b of a resistor 3; the second input end of the NAND gate IC4 is connected with a resistor R12, the junction of the second input end and the resistor R is connected with the output end of a comparator IC3, and the output end of the comparator IC3 is provided with a junction f;
the reference voltage of the comparator IC3 is VREF3, and the inverting input end of the comparator IC is sequentially connected with a resistor R9 and a rechargeable battery BAT in series and then is connected with the negative electrode of the power supply; the node g of the comparator IC3 and the resistor R9 is connected to the resistor R10 and then to the negative electrode of the power supply.
In a preferred embodiment, the first voltage division control unit includes a gate of a field effect transistor Q1 connected to a resistor R3, and a source of the field effect transistor Q1 is connected to an anode of a voltage regulator D4 and the other end of the resistor R4;
the drain electrode of the field effect tube Q1 is connected with a resistor R5 and the grid electrode of the field effect tube Q2 in series, two nodes are connected to the drain electrode and the grid electrode, one end of a resistor R6 is connected to the node close to the resistor R5, and the anode of a voltage stabilizing tube D5 is connected to the node c close to the field effect tube Q2; the other end of the resistor R6 and the cathode of the voltage stabilizing tube D5 are connected with the positive end of the power supply; the source electrode of the field effect tube Q2 is connected with one end of a load after being connected with the positive end of a power supply, the other end of the load is connected with the negative end of the power supply, and the drain electrode of the field effect tube Q2 is connected with a second partial pressure control unit.
In a preferred embodiment, the second voltage division control unit comprises a grid electrode of a field effect transistor Q4 connected with a resistor R3 and a node of the first voltage division control unit; the source electrode of the field effect tube Q4 is connected with the negative end of the power supply, and the drain electrode of the field effect tube Q4 is sequentially connected with a resistor R7 and the grid electrode of the field effect tube Q3;
the drain electrode of the field effect transistor Q3 is connected with the drain electrode of the field effect transistor Q2; the junction D of the resistor R7 and the field effect tube Q3 is sequentially connected with one end of the resistor R8 and the anode of the voltage stabilizing tube D6, and the other end of the resistor R8 and the cathode of the voltage stabilizing tube D6 are respectively connected with the drain electrode of the field effect tube Q3 and then connected with the junction of the resistor R9 and the rechargeable battery BAT.
In the preferred embodiment, the power comparator IC1 outputs a high level in the undervoltage condition, a normal voltage and the power comparator IC1 outputs a low level in the overvoltage condition.
In the preferred embodiment, the comparator IC2 outputs a low level in the undervoltage state, a normal voltage and the comparator IC2 outputs a high level in the overvoltage state; the comparator IC3 outputs a high level in the under-voltage state of the rechargeable battery BAT, and the comparator IC3 outputs a low level in the normal state of the rechargeable battery BAT.
In a second aspect, an under-voltage surge and low-voltage automatic control early warning protection device includes the above-mentioned under-voltage surge and low-voltage automatic control early warning protection circuit.
Compared with the prior art, the utility model has the following beneficial effects:
(1) The voltage dividing window selection unit is used for forming the selection comparison voltage, the monitoring and control unit is used for monitoring the voltage and controlling whether the charging storage battery is charged and the load is supplied with power together with the window selection unit by controlling the first voltage dividing control unit and the second voltage dividing control unit, so that the influence on the normal operation of the subsequent-stage equipment in the under-voltage surge and low-voltage state is avoided.
(2) In the utility model, the rechargeable storage battery is used for replacing devices such as an energy storage capacitor, and the system can work for a long time under an under-voltage state, so that the problem of stability of power supply of the system is solved well; the monitoring and control unit is used for monitoring and controlling the voltage on the power supply line and the voltage of the charging storage battery in real time, so that the intelligent control of charging and discharging of the charging storage battery is realized.
(3) The under-voltage early warning unit can provide an alarm signal in time in cooperation with an automatic control system, so that faults on a power supply line can be found and removed conveniently in time.
Drawings
Fig. 1 is a schematic circuit structure of the present utility model.
Detailed Description
The utility model will now be further described with reference to the accompanying drawings and examples, embodiments of which include, but are not limited to, the following examples.
According to the embodiment, through monitoring the voltages at two ends of the field effect tube, the problem of overlarge impact current caused by short circuit damage of the field effect tube is effectively prevented, and the energy storage capacitor is replaced by a battery; when the under-voltage surge comes, the charging storage battery supplies power to the back-end equipment; simultaneously monitoring the self voltage of the charging storage battery in real time, when the charging storage battery is lower than a set value, automatically charging the charging storage battery by the system, and stopping charging when the charging storage battery is charged to the set value; the specific scheme is as follows.
As shown in FIG. 1, the automatic control early warning protection circuit for undervoltage surge and low voltage comprises an early warning unit and a partial pressure window selection unit connected with a power supply, wherein the partial pressure window selection unit is mutually connected with a monitoring and control unit in a communication way; the first control end of the monitoring and control unit is respectively connected with the input end of the first partial pressure control unit and the input end of the second partial pressure control unit; the output end of the first partial pressure control unit and the output end of the second partial pressure control unit are connected with a load;
as an embodiment, the two input ends of the early warning unit are respectively connected with the control end of the partial pressure window selection unit and the second control end of the monitoring and control unit.
The early warning unit comprises a resistor R11 and a Light Emitting Diode (LED) 1 which are sequentially connected in series with the voltage dividing window selection unit, and a resistor R12 and a Light Emitting Diode (LED) 2 which are sequentially connected in series with the monitoring and control unit; the resistor R11 and the light emitting diode LED1 are connected in series and then connected in parallel with the resistor R12 and the light emitting diode LED2, and are connected with the negative end of the power supply after being connected in parallel.
As one embodiment, the voltage division window selecting unit includes a resistor R1 and a resistor R2 connected to the positive and negative terminals of the power supply, respectively; the connecting line of the resistor R1 and the resistor R2 is sequentially provided with two nodes, the node close to the resistor R1 is a, the node is connected with the inverting input end of the comparator IC1, and the node close to the resistor R2 is connected with the non-inverting input end of the comparator IC 2; the reference voltage of the comparator IC1 is VREF1, and the reference voltage of the comparator IC2 is VREF2; the output ends of the comparator IC1 and the comparator IC2 are respectively connected with the monitoring and control unit.
As an example, the monitoring and control unit comprises a rechargeable battery BAT, a resistor R9, an anode of a diode D2 and a resistor R3; the output end of the comparator IC1 is sequentially connected with the anode of the diode D2 and the resistor R3 in series and then connected with the first voltage division control unit, and the junction of the comparator IC1 and the diode D2 is connected with the resistor R11;
the monitoring and control unit also comprises a voltage stabilizing tube D4 and a resistor R4 which are connected in parallel; one end of a cathode of the voltage stabilizing tube D4 and one end of the resistor R4 are connected with a node of the resistor R3 and the first voltage division control unit and then connected with the second voltage division control unit; the anode of the voltage stabilizing tube D4 and the other end of the resistor R4 are connected with the first voltage division control unit and then connected with the negative electrode of the power supply;
the output end of the comparator IC2 is connected with the first input end of the NAND gate IC4, and the node of the comparator IC2 and the first input end is e; the output end of the NAND gate IC4 is sequentially connected with the anode of a diode D3, a diode D2 and a node b of a resistor 3; the second input end of the NAND gate IC4 is connected with a resistor R12, the junction of the second input end and the resistor R is connected with the output end of a comparator IC3, and the output end of the comparator IC3 is provided with a junction f;
the reference voltage of the comparator IC3 is VREF3, and the inverting input end of the comparator IC is sequentially connected with a resistor R9 and a rechargeable battery BAT in series and then is connected with the negative electrode of the power supply; the node g of the comparator IC3 and the resistor R9 is connected to the resistor R10 and then to the negative electrode of the power supply.
As one embodiment, the first voltage division control unit includes a gate of a field effect transistor Q1 connected to a resistor R3, and a source of the field effect transistor Q1 is connected to an anode of a voltage regulator D4 and the other end of the resistor R4;
the drain electrode of the field effect tube Q1 is connected with a resistor R5 and the grid electrode of the field effect tube Q2 in series, two nodes are connected to the drain electrode and the grid electrode, one end of a resistor R6 is connected to the node close to the resistor R5, and the anode of a voltage stabilizing tube D5 is connected to the node c close to the field effect tube Q2; the other end of the resistor R6 and the cathode of the voltage stabilizing tube D5 are connected with the positive end of the power supply; the source electrode of the field effect tube Q2 is connected with one end of a load after being connected with the positive end of a power supply, the other end of the load is connected with the negative end of the power supply, and the drain electrode of the field effect tube Q2 is connected with a second partial pressure control unit.
As one embodiment, the second voltage division control unit includes a gate of a field effect transistor Q4 connected to a node of the resistor R3 and the first voltage division control unit; the source electrode of the field effect tube Q4 is connected with the negative end of the power supply, and the drain electrode of the field effect tube Q4 is sequentially connected with a resistor R7 and the grid electrode of the field effect tube Q3;
the drain electrode of the field effect transistor Q3 is connected with the drain electrode of the field effect transistor Q2; the junction D of the resistor R7 and the field effect tube Q3 is sequentially connected with one end of the resistor R8 and the anode of the voltage stabilizing tube D6, and the other end of the resistor R8 and the cathode of the voltage stabilizing tube D6 are respectively connected with the drain electrode of the field effect tube Q3 and then connected with the junction of the resistor R9 and the rechargeable battery BAT.
The principle of this embodiment is as follows:
as shown in fig. 1, first, the reference voltages VREF1, VREF2, VREF3 at the input terminals of the comparator should be set to appropriate voltage values as needed. The following requirements are satisfied: the external power supply voltage Vin+ is that the power supply is in a state of undervoltage, the comparator IC1 outputs a high level, and the normal voltage and the comparator IC1 outputs a low level when in overvoltage; in the undervoltage state, the comparator IC2 outputs a low level, a normal voltage and the comparator IC2 outputs a high level when the power vin+ is overvoltage. In a state where the rechargeable battery BAT is under-voltage (i.e., the rechargeable battery needs to be charged), the comparator IC3 outputs a high level, and when the rechargeable battery does not need to be charged, the comparator IC3 outputs a low level.
(1) When the system works normally, the voltage of the input end is in the normal working range, and no under-voltage exists. After the resistor R1 and the resistor R2 are divided, the sampling voltage Ua (a point voltage) is higher than the undervoltage state, the Ua is connected to the inverting input terminal of the comparator IC1, and the reference voltage VREF1 is connected to the non-inverting input terminal of the comparator IC 1. Ua is high and after comparison by comparator IC1, comparator IC1 outputs a low level. Meanwhile, the sampling voltage Ua (a point voltage) is connected to the non-inverting input terminal of the comparator IC2, and the reference voltage VREF2 is connected to the inverting input terminal of the comparator IC 2. Ua is high and after comparison by comparator IC2, comparator IC2 outputs a low level Ue (voltage at point e).
When the electric energy of the charging storage battery is sufficient, the charging is not needed, and the voltage of the charging storage battery is higher. The sampled voltage Ug (g-point voltage) of the charged battery is also monitored to be relatively high. Ug is connected to the inverting input terminal of the comparator IC3, the reference voltage VREF3 is connected to the non-inverting input terminal of the comparator IC3, and the comparator IC3 outputs a low level Uf (voltage at the f point) after comparison by the comparator IC 3. Ue (voltage at point e) and Uf (voltage at point f) are input to the nand gate IC4, ue (voltage at point e) is at high level, uf (voltage at point f) is at low level, and after both are, the and gate IC4 outputs low level. Since both the and gate IC4 and the comparator IC1 output a low level, ub (voltage at point b) is a low level. The voltage of Ub controls the gates of the N-type field effect transistor Q1 and the field effect transistor Q4, and when Ub is low, the field effect transistor Q1 and the field effect transistor Q4 are both in an off state. When the fet Q1 is turned off, the resistor R6 and the resistor R5 cannot form a voltage division, the gate voltage and the source voltage of the P-type fet Q2 are equal, and the fet Q2 is also turned off. Similarly, after the fet Q4 is turned off, the resistor R7 and the resistor R8 cannot form a voltage division, the gate voltage and the source voltage of the P-type fet Q3 are equal, and the fet Q3 is also turned off. The field effect tube Q2, the field effect tube Q3 and the charging storage battery BAT are connected in series between Vout+ and Vout-, after the field effect tube Q2 and the field effect tube Q3 are cut off, a charging and discharging channel between the charging storage battery and a positive line of a power supply line is cut off, namely the charging storage battery cannot be charged or discharged, and the load RL works completely by the power supply line outside.
When the electric energy of the rechargeable battery is insufficient, the rechargeable battery needs to be charged, and the voltage of the rechargeable battery is low. When the voltage of the rechargeable battery is low, the sampling voltage Ug of the rechargeable battery is low, ug is connected to the inverting output end of the comparator IC3, the reference voltage VREF3 is connected to the non-inverting input end of the comparator IC3, ug is low, and the comparator IC3 outputs a high level. Ug is high, ue is also high, both are connected to the input of and gate IC4, respectively, and nand gate IC4 outputs high after the phase is taken, ub (voltage at point b) is high. Ub controls the gates of N-type field effect transistor Q1 and field effect transistor Q4, and when Ub is high, both field effect transistor Q1 and field effect transistor Q4 are turned on. After the field effect transistor Q1 is turned on, the resistor R6 and the resistor R5 form partial pressure, and negative pressure difference is generated between the grid electrode and the source electrode of the P-type field effect transistor to turn on the field effect transistor Q2 (namely, the grid voltage is lower than the source electrode voltage and the P-type field effect transistor can be turned on after the grid voltage reaches the starting voltage). Similarly, after the field effect transistor Q4 is turned on, the resistor R8 and the resistor R7 form a voltage division capable of turning on the P-type field effect transistor Q3. After the field effect transistor Q2 and the field effect transistor Q3 are both turned on, the voltage on the power supply line is high, and the voltage of the charging storage battery is relatively low, so that the electric energy on the power supply line charges the charging storage battery BAT through the diode D1, the P-type field effect transistor Q2 and the P-type field effect transistor Q3. The voltage of the charged battery BAT is stepped up until the charging is completed. After the charging is completed, the sampling voltage Ug will become high, ug is connected to the inverting input terminal of the comparator IC3, the output Uf of the comparator IC3 becomes low level, the output of the and gate IC4 also becomes low level, and the voltage Ub becomes low level. After Ub is low level, the N-type field effect transistor Q1 and the field effect transistor Q4 are turned off, after the field effect transistor Q1 and the field effect transistor Q4 are turned off, the P-type field effect transistor Q2 and the field effect transistor Q3 are turned off, and the charging and discharging channels of the charging storage battery BAT and the power supply line are cut off, so that the charging of the charging storage battery can be automatically stopped.
(2) When under-voltage surge or low-voltage power supply is carried out, the system can be automatically switched to a charging storage battery to supply power to a load. When under-voltage or low-voltage occurs, after the resistor R1 and the resistor R2 are divided, the sampling voltage Ua (a point voltage) becomes lower, ua is connected with the inverting input terminal of the comparator IC1, the reference voltage VREF1 is connected with the non-inverting input terminal of the comparator IC1, and after the two voltages are compared by the comparator IC1, a high level is output, and Ub (b point voltage) is high. Ub controls the gates of N-type field effect transistor Q1 and field effect transistor Q4, and when Ub is high, both field effect transistor Q1 and field effect transistor Q4 are turned on. After the field effect transistor Q1 is turned on, the resistor R6 and the resistor R5 form partial voltage, and negative voltage difference is generated between the grid electrode and the source electrode of the P-type field effect transistor to turn on Q2 (namely, the grid voltage is lower than the source electrode voltage and the P-type field effect transistor can be turned on after the grid voltage reaches the starting voltage). Similarly, after the field effect transistor Q4 is turned on, the resistor R8 and the resistor R7 form a voltage division capable of turning on the P-type field effect transistor Q3. After the field effect transistor Q2 and the field effect transistor Q3 are conducted, the voltage of the power supply line is low, and the voltage of the charging storage battery is relatively high, so that the electric energy of the charging storage battery can provide electric energy for the load RL through the P-type field effect transistor Q2 and the P-type field effect transistor Q3, and the load RL works in a normal working voltage range. The power supply line is connected in series with a diode D1, and the unidirectional conductivity of the diode prevents the rechargeable battery BAT from supplying power to the power supply input end, and only supplies power to the load end RL.
(3) Early warning system
When the voltage of the power supply input end is under-voltage, the light emitting diode LED1 emits light; when the charging battery voltage is low and charging is required, the light emitting diode LED2 emits light. The comparison table of the early warning indicator lamp and the power supply state of the system is as follows:
the comparator IC1, the comparator IC2 and the comparator IC3 are voltage comparators; IC4 is a nand gate; the field effect transistor Q1 and the field effect transistor Q4 are N-type field effect transistors; the field effect transistor Q2 and the field effect transistor Q3 are P-type field effect transistors; diode D1, diode D2, and diode D3; a voltage stabilizing tube D4, a voltage stabilizing tube D5 and a voltage stabilizing tube D6; VREF1, VREF2, VREF3 are reference voltages of the comparator.
An under-voltage surge and low-voltage automatic control early warning protection device comprises the under-voltage surge and low-voltage automatic control early warning protection circuit; according to the device, through the automatic control early warning protection circuit for undervoltage surge and low voltage, the system power supply stability is high, the function of intelligent control of charging and discharging of the rechargeable battery is realized, and the undervoltage early warning unit is matched with the automatic control system to timely provide an alarm signal, so that faults on a power supply line can be conveniently found and removed in time.
The utility model can be used in special power supply systems which cannot be powered off, such as medical treatment, aviation and the like, and can effectively solve the problem of undervoltage power supply of the system.
The present utility model can be well implemented according to the above-described embodiments. It should be noted that, based on the above structural design, even if some insubstantial modifications or color-rendering are made on the present utility model, the essence of the adopted technical solution is still the same as the present utility model, so it should be within the protection scope of the present utility model.
Claims (10)
1. An under-voltage surge and low-voltage automatic control early warning protection circuit is characterized in that: the device comprises a voltage division window selection unit connected with a power supply, wherein the voltage division window selection unit is mutually connected with a monitoring and control unit in a communication way; the first control end of the monitoring and control unit is respectively connected with the input end of the first partial pressure control unit and the input end of the second partial pressure control unit; the output end of the first voltage division control unit and the output end of the second voltage division control unit are connected with a load.
2. The automatic control early warning protection circuit for undervoltage surge and low voltage according to claim 1, wherein: the system also comprises an undervoltage early warning unit, wherein two input ends of the undervoltage early warning unit are respectively connected with the control end of the partial pressure window selection unit and the second control end of the monitoring and control unit.
3. The automatic control early warning protection circuit for undervoltage surge and low voltage according to claim 2, wherein: the undervoltage early warning unit comprises a resistor R11 and a Light Emitting Diode (LED) 1 which are sequentially connected in series with the voltage dividing window selection unit, and a resistor R12 and a Light Emitting Diode (LED) 2 which are sequentially connected in series with the monitoring and control unit; the resistor R11 and the light emitting diode LED1 are connected in series and then connected in parallel with the resistor R12 and the light emitting diode LED2, and are connected with the negative end of the power supply after being connected in parallel.
4. The automatic control early warning protection circuit for undervoltage surge and low voltage according to claim 3, wherein: the voltage division window selection unit comprises a resistor R1 and a resistor R2 which are respectively connected with the positive end and the negative end of the power supply; the connecting line of the resistor R1 and the resistor R2 is sequentially provided with two nodes, the node close to the resistor R1 is a, the node is connected with the inverting input end of the comparator IC1, and the node close to the resistor R2 is connected with the non-inverting input end of the comparator IC 2; the reference voltage of the comparator IC1 is VREF1, and the reference voltage of the comparator IC2 is VREF2; the output ends of the comparator IC1 and the comparator IC2 are respectively connected with the monitoring and control unit.
5. The automatic control early warning protection circuit for undervoltage surge and low voltage according to claim 4, wherein: the monitoring and control unit comprises a rechargeable battery BAT, a resistor R9, an anode of a diode D2 and a resistor R3; the output end of the comparator IC1 is sequentially connected with the anode of the diode D2 and the resistor R3 in series and then connected with the first voltage division control unit, and the junction of the comparator IC1 and the diode D2 is connected with the resistor R11;
the monitoring and control unit also comprises a voltage stabilizing tube D4 and a resistor R4 which are connected in parallel; one end of a cathode of the voltage stabilizing tube D4 and one end of the resistor R4 are connected with a node of the resistor R3 and the first voltage division control unit and then connected with the second voltage division control unit; the anode of the voltage stabilizing tube D4 and the other end of the resistor R4 are connected with the first voltage division control unit and then connected with the negative electrode of the power supply;
the output end of the comparator IC2 is connected with the first input end of the NAND gate IC4, and the node of the comparator IC2 and the first input end is e; the output end of the NAND gate IC4 is sequentially connected with the anode of a diode D3, a diode D2 and a node b of a resistor 3; the second input end of the NAND gate IC4 is connected with a resistor R12, the junction of the second input end and the resistor R is connected with the output end of a comparator IC3, and the output end of the comparator IC3 is provided with a junction f;
the reference voltage of the comparator IC3 is VREF3, and the inverting input end of the comparator IC is sequentially connected with a resistor R9 and a rechargeable battery BAT in series and then is connected with the negative electrode of the power supply; the node g of the comparator IC3 and the resistor R9 is connected to the resistor R10 and then to the negative electrode of the power supply.
6. The automatic control early warning protection circuit for undervoltage surge and low voltage according to claim 5, wherein: the first partial pressure control unit comprises a grid electrode of a field effect tube Q1 connected with a resistor R3, and a source electrode of the field effect tube Q1 is connected with an anode of a voltage stabilizing tube D4 and the other end of the resistor R4;
the drain electrode of the field effect tube Q1 is connected with a resistor R5 and the grid electrode of the field effect tube Q2 in series, two nodes are connected to the drain electrode and the grid electrode, one end of a resistor R6 is connected to the node close to the resistor R5, and the anode of a voltage stabilizing tube D5 is connected to the node c close to the field effect tube Q2; the other end of the resistor R6 and the cathode of the voltage stabilizing tube D5 are connected with the positive end of the power supply; the source electrode of the field effect tube Q2 is connected with one end of a load after being connected with the positive end of a power supply, the other end of the load is connected with the negative end of the power supply, and the drain electrode of the field effect tube Q2 is connected with a second partial pressure control unit.
7. The automatic control early warning protection circuit for undervoltage surge and low voltage according to claim 6, wherein: the second partial pressure control unit comprises a grid electrode of a field effect transistor Q4 connected with a resistor R3 and a node of the first partial pressure control unit; the source electrode of the field effect tube Q4 is connected with the negative end of the power supply, and the drain electrode of the field effect tube Q4 is sequentially connected with a resistor R7 and the grid electrode of the field effect tube Q3;
the drain electrode of the field effect transistor Q3 is connected with the drain electrode of the field effect transistor Q2; the junction D of the resistor R7 and the field effect tube Q3 is sequentially connected with one end of the resistor R8 and the anode of the voltage stabilizing tube D6, and the other end of the resistor R8 and the cathode of the voltage stabilizing tube D6 are respectively connected with the drain electrode of the field effect tube Q3 and then connected with the junction of the resistor R9 and the rechargeable battery BAT.
8. The automatic control early warning protection circuit for undervoltage surge and low voltage according to any one of claims 4 to 7, wherein: the power supply is under the undervoltage state, the power supply comparator IC1 outputs a high level, and the power supply comparator IC1 outputs a low level at normal voltage and overvoltage.
9. The automatic control early warning protection circuit for undervoltage surge and low voltage according to any one of claims 4 to 7, wherein: under the undervoltage state of the power supply, the comparator IC2 outputs a low level, and the normal voltage and the overvoltage comparator IC2 outputs a high level; the comparator IC3 outputs a high level in the under-voltage state of the rechargeable battery BAT, and the comparator IC3 outputs a low level in the normal state of the rechargeable battery BAT.
10. An automatic control early warning protection device for undervoltage surge and low voltage is characterized in that: an under-voltage surge and low-voltage automatic control early warning protection circuit comprising the circuit according to any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322269222.0U CN220673428U (en) | 2023-08-22 | 2023-08-22 | Automatic control early warning protection circuit and device for undervoltage surge and low voltage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202322269222.0U CN220673428U (en) | 2023-08-22 | 2023-08-22 | Automatic control early warning protection circuit and device for undervoltage surge and low voltage |
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| CN220673428U true CN220673428U (en) | 2024-03-26 |
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| CN202322269222.0U Active CN220673428U (en) | 2023-08-22 | 2023-08-22 | Automatic control early warning protection circuit and device for undervoltage surge and low voltage |
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| CN (1) | CN220673428U (en) |
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