Novel isolation transformer
By integrating voltage and resistance detection circuits and alarm circuits into the isolation transformer, the problem of the lack of monitoring functions in the isolation transformer is solved, realizing real-time detection and alarm of voltage and resistance, and reducing the risk of equipment damage.
Patent Information
- Application Number
- CN202520126841.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-01-20
AI Technical Summary
Existing isolation transformers lack voltage input and output monitoring functions and winding performance detection, resulting in a high risk of equipment damage when voltage is abnormal.
The isolation transformer body integrates a primary coil voltage detection circuit, a secondary coil voltage detection circuit, a primary coil resistance detection circuit, a secondary coil resistance detection circuit, and an alarm circuit. These circuits monitor in real time and issue alarms when abnormalities occur, reminding technicians to carry out maintenance.
It effectively reduces damage to electrical equipment caused by abnormal voltage. By detecting and monitoring in advance, the probability of equipment damage is reduced.
Smart Images
Figure CN223770936U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of transformer technology, and in particular to a novel isolation transformer. Background Technology
[0002] An isolation transformer is a special type of transformer with electrical isolation between its input and output windings. It prevents the risk of electric shock due to insulation failure by isolating the currents in the primary and secondary coils. Its operating principle is based on electromagnetic induction, and it is widely used in various applications requiring safe power supplies, such as control power supplies in industrial machine tools, medical equipment, and machinery, as well as power supplies for safety lighting and indicator lights. Furthermore, isolation transformers also have filtering functions, improving power quality and reducing the impact of power transients. Structurally, the primary and secondary windings of an isolation transformer are typically placed on separate cores to reduce the capacitance between them and enhance anti-interference capabilities. Electrostatic shielding technology is also widely used in isolation transformers to further reduce electromagnetic interference. These characteristics make isolation transformers crucial for protecting sensitive equipment and improving system stability.
[0003] Although existing isolation transformers meet the operational requirements to some extent, they also have the following drawbacks due to structural limitations. Firstly, they lack voltage input and output monitoring functions during operation. This means that when the external input power supply voltage and output voltage are abnormal for various reasons, it will adversely affect the safety of the electrical equipment at the secondary output end (for example, if the voltage at the secondary output end is too low or too high, it will cause damage to the electrical equipment). Secondly, the lack of primary and secondary winding performance monitoring capabilities prevents early maintenance. Consequently, when the resistance of the primary or secondary windings of the isolation transformer decreases (e.g., due to inter-turn short circuits or open circuits causing no output voltage, which is readily apparent to the user), the user's lack of awareness could lead to a potential increase or decrease in the secondary output voltage (a decrease in primary winding resistance results in a decrease in secondary winding output voltage, while a decrease in secondary winding resistance results in an increase), potentially damaging electrical equipment (e.g., excessively high or low output voltage causing immediate damage upon startup). Therefore, providing an isolation transformer capable of real-time output voltage monitoring during normal operation and checking the resistance values of the primary and secondary windings before use is crucial. Utility Model Content
[0004] To overcome the drawbacks of existing isolation transformers due to structural limitations, as described in the background, this utility model provides a new type of isolation transformer that, based on the transformer body, can detect the resistance values of the primary and secondary winding coils before use. This allows technicians to perform early repairs when abnormalities occur, reducing the risk of damage to electrical equipment due to voltage anomalies caused by excessively low primary and secondary winding resistance values leading to either excessively high or low secondary output voltage. Furthermore, this new type of isolation transformer can monitor the input voltage of the primary winding and the output voltage of the secondary winding in real time during operation, promptly alerting technicians to repair any abnormalities, thus further reducing the probability of equipment damage.
[0005] The technical solution adopted by this utility model to solve its technical problem is:
[0006] A novel isolation transformer includes an isolation transformer body and further comprises a primary coil voltage detection circuit, a secondary coil voltage detection circuit, an alarm circuit, a primary coil resistance detection circuit, and a secondary coil resistance detection circuit. These circuits are installed within a component box. The signal output terminals of the primary coil voltage detection circuit, the secondary coil voltage detection circuit, the alarm circuit, the primary coil resistance detection circuit, and the secondary coil resistance detection circuit are electrically connected to the signal input terminal of the alarm circuit. The signal input terminals of the primary coil voltage detection circuit and the primary coil resistance detection circuit, and the signal input terminals of the secondary coil voltage detection circuit and the secondary coil resistance detection circuit, are respectively connected in series with a power switch and electrically connected to the two ends of the primary and secondary coils of the isolation transformer body.
[0007] Furthermore, the primary-side coil voltage detection circuit and the secondary-side coil voltage detection circuit are constructed together, each including an electrically connected bridge rectifier, capacitor, adjustable resistor, resistor, transistor, and three-terminal voltage detector. The positive power output terminal of the bridge rectifier is connected to the positive terminal of the capacitor, one end of the first and second adjustable resistors, and the emitter of the transistor. The other end of the first adjustable resistor is connected to one end of the first resistor and the positive power input terminal of the first three-terminal voltage detector. The other end of the second adjustable resistor is connected to one end of the second resistor and the positive power input terminal of the second three-terminal voltage detector. The power output terminals of the first and second three-terminal voltage detectors are connected to one end of the third and fourth resistors. The other end of the third resistor is connected to one end of the fifth resistor. The other end of the fourth resistor is connected to the base of the transistor. The collector of the transistor is connected to the other end of the fifth resistor. The negative power output terminal of the bridge rectifier is connected to the negative terminal of the capacitor, the other end of the first resistor, and the negative power input terminals of the first and second three-terminal voltage detectors.
[0008] Furthermore, the primary coil resistance detection circuit and the secondary coil resistance detection circuit have the same structure, both including an adjustable resistor, a resistor, a transistor, and a relay that are electrically connected. The positive power input terminal and the control power input terminal of the relay are connected. One end of the adjustable resistor is connected to one end of the first resistor and one end of the second resistor. The other end of the first resistor is connected to the emitter of the transistor. The other end of the second resistor is connected to the base of the transistor. The collector of the transistor is connected to the negative power input terminal of the relay.
[0009] Furthermore, the alarm circuit includes an electrically connected thyristor and resistor, and an alarm. The positive power input terminal of the alarm is connected to the cathode of the thyristor, and the control electrode of the thyristor is connected to one end of the resistor.
[0010] Compared with existing technologies, the advantages of this invention are as follows: Based on the isolation transformer body, this invention can detect the resistance values of the primary and secondary winding coils through relevant circuits before use. When an abnormality occurs, technicians can hear the alarm and perform repairs in advance. This reduces the risk of damage to electrical equipment due to voltage anomalies at startup caused by excessively low resistance values in the primary and secondary windings, resulting in either excessively high or low secondary output voltage. Furthermore, it can monitor the input voltage of the primary winding and the output voltage of the secondary winding in real time during operation, and the alarm can also alert technicians to any abnormalities, further reducing the probability of equipment damage. In conclusion, this invention has good application prospects. Attached Figure Description
[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0013] Figure 2 This is the circuit diagram of this utility model. Detailed Implementation
[0014] Figure 1 , 2 As shown, the novel isolation transformer includes an isolation transformer body T, a power module A1, a power switch, and a battery G1. It also has a primary coil voltage detection circuit 1, a secondary coil voltage detection circuit 2, an alarm circuit 3, a primary coil resistance detection circuit 4, and a secondary coil resistance detection circuit 5. The power module A1, the power switch, the primary coil voltage detection circuit 1, the secondary coil voltage detection circuit 2, the alarm circuit 3, the primary coil resistance detection circuit 4, the secondary coil resistance detection circuit 5, and the battery G1 are installed in a component box 6 inside the isolation transformer body.
[0015] Figure 1 , 2As shown, the primary coil voltage detection circuit includes a bridge rectifier A3, capacitor C1, adjustable resistors RP1 and RP5, resistors R1, R2, R3, R4, and R13, transistor Q1, and three-terminal voltage detectors A5 and A6, all connected via circuit board wiring. The positive power output terminal (pin 3) of bridge rectifier A3 is connected to the positive terminal of capacitor C1, one end of adjustable resistors RP1 and RP5, and the emitter of transistor Q1. The other end of adjustable resistor RP1 is connected to one end of the first resistor R1 and the positive power input terminal (pin 2) of the first three-terminal voltage detector A5. The other end of adjustable resistor RP5 is connected to one end of the second resistor R13 and the second three-terminal voltage detector A6. The positive power input terminal 2 of the bridge rectifier A6 is connected to the power output terminal 1 of the first three-terminal voltage detector A5 and the second three-terminal voltage detector A6, and one end of the third resistor R2 and one end of the fourth resistor R3. The other end of the third resistor R2 is connected to one end of the fifth resistor R4. The other end of the fourth resistor R3 is connected to the base of the transistor Q1. The collector of the transistor Q1 is connected to the other end of the fifth resistor R4. The negative power output terminal 4 of the bridge rectifier A3 is connected to the negative terminal of the capacitor C1, the other end of the first resistor R1, and the negative power input terminal 2 of the first three-terminal voltage detector A5 and the second three-terminal voltage detector A6. The secondary coil voltage detection circuit includes a bridge rectifier A4, capacitor C2, adjustable resistors RP2 and RP6, resistors R5, R6, R7, R8, and R14, transistor Q2, and three-terminal voltage detectors A7 and A8, all connected via circuit board wiring. The positive power output terminal (pin 3) of bridge rectifier A4 is connected to the positive terminal of capacitor C2, one end of adjustable resistors RP2 and RP6, and the emitter of transistor Q2. The other end of adjustable resistor RP2 is connected to one end of the first resistor R5 and the positive power input terminal (pin 2) of the first three-terminal voltage detector A7. The other end of adjustable resistor RP6 is connected to one end of the second resistor R14 and the second three-terminal voltage detector A7. The positive power input terminal 2 of the bridge rectifier A4 is connected to the power output terminal 1 of the first three-terminal voltage detector A7 and the second three-terminal voltage detector A8, and one end of the third resistor R6 and one end of the fourth resistor R8. The other end of the third resistor R5 is connected to one end of the fifth resistor R8. The other end of the fourth resistor R7 is connected to the base of transistor Q2. The collector of transistor Q1 is connected to the other end of the fifth resistor R8. The negative power output terminal 4 of the bridge rectifier A4 is connected to the negative terminal of capacitor C2, the other end of the first resistor R5, and the negative power input terminal 2 of the first three-terminal voltage detector A7 and the second three-terminal voltage detector A8. The primary coil resistance detection circuit includes an adjustable resistor RP3, resistors R9 and R10, a transistor Q, and a relay J connected via circuit board wiring. The positive power input terminal and the control power input terminal of the relay J are connected. One end of the adjustable resistor RP3 is connected to one end of the first resistor R9 and one end of the second resistor R10. The other end of the first resistor R9 is connected to the emitter of the transistor Q. The other end of the second resistor R10 is connected to the base of the transistor Q. The collector of the transistor Q is connected to the negative power input terminal of the relay J.The secondary coil resistance detection circuit includes an adjustable resistor RP4, resistors R11 and R12, a transistor Q3, and a relay J1, all connected via circuit board wiring. The positive power input terminal and the control power input terminal of relay J1 are connected. One end of the adjustable resistor RP4 is connected to one end of the first resistor R11 and one end of the second resistor R12. The other end of the first resistor R11 is connected to the emitter of transistor Q3, and the other end of the second resistor R12 is connected to the base of transistor Q3. The collector of transistor Q3 is connected to the negative power input terminal of relay J1. The alarm circuit includes a thyristor VS, a resistor R15, and an alarm B, all connected via circuit board wiring. The positive power input terminal of alarm B is connected to the cathode of thyristor VS, and the control terminal of thyristor VS is connected to one end of resistor R15.
[0016] Figure 1 , 2 As shown, the power input terminals 1 and 2 of power module A1 are connected to the two poles of the 220V AC power supply via wires. The power output terminals 3 and 4 of power module A1 are connected to the two poles of battery G1, the negative terminal of capacitor C1 (power input terminal of primary coil voltage detection circuit), the negative terminal of capacitor C2 (power input terminal of secondary coil voltage detection circuit), the anode of thyristor VS (power input terminal of alarm circuit), the negative power input terminal of alarm B, the positive power input terminal of relay J (power input terminal of primary coil resistance detection circuit), and the emitter of transistor Q; the positive power input terminal of relay J1 (power input terminal of secondary coil resistance detection circuit) and the emitter of transistor Q3 are also connected via wires. The signal output terminals of the primary coil voltage detection circuit (resistors R2 and R4 at one end), the secondary coil voltage detection circuit (resistors R6 and R8 at one end), the normally open contact of relay J (power output terminal of primary coil resistance detection circuit), the normally open contact of relay J1 (power output terminal of secondary coil resistance detection circuit), and the other end of resistor R15 (power input terminal of alarm circuit) are connected via wires. Pins 1 and 2 of bridge rectifier A3 in the primary coil voltage detection circuit and pins 1 and 2 of bridge rectifier A4 in the secondary coil detection circuit are connected in series with the first power switch S1 and to the primary and secondary coil windings of the isolation transformer body T via wires (power switch S1 has two power input terminals and two power output terminals; two power switches S1 share one adjustment handle). The positive power input terminal of relay J in the primary coil resistance detection circuit and the other end of adjustable resistor RP3, and the positive power input terminal of relay J1 in the secondary coil resistance detection circuit and the other end of adjustable resistor RP4 are connected in series with the first power switch S2 and to the primary and secondary coil windings of the isolation transformer body T via wires (power switch S2 has two power input terminals and two power output terminals; two power switches S2 share one adjustment handle). Figure 2In the diagram, power module A1 is a finished product of AC 220V to DC 12V power module; transistors Q1 and Q2 are model 9012 (PNP); alarm B is a finished product of FM12V active continuous audible alarm; transistors Q and Q3 are model 9013 (NPN); battery G1 is a model 12V / 5Ah lithium battery; bridge rectifiers A3 and A4 are model GBP206; three-terminal voltage detectors A5, A6, A7, and A8 are model AN051A; relays J and J1 are model DC12V; thyristor VS is model MCR100-1; capacitors C1 and C2... The model is 470uf / 25V; the resistance values of resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, and R15 are 4.75K, 1K, 1K, 1K, 4.75K, 1K, 1K, 1K, 4K, 10K, 4K, 10K, 4.75K, 4.75K, and 1K respectively; the adjustable resistors RP1, RP2, RP3, and RP4 have a resistance value of 470K (adjustable to 230K, 200K, 400K, and 400K respectively); the isolation transformer body model T is GBK-5000VA.
[0017] Figure 1 , 2 As shown, this new type is based on the isolation transformer body T, which has electrical isolation between its input winding and output winding. The isolation transformer prevents the risk of electric shock due to insulation damage by isolating the currents of the primary and secondary windings. Its working principle is based on electromagnetic induction and it is widely used in various occasions requiring safe power supplies, such as control power supplies in industrial machine tools, medical equipment, and mechanical equipment, as well as power supplies for safety lighting and indicator lights. In addition, the isolation transformer body T also has a filtering function, which can improve power quality and reduce the impact of power transients. The above are existing mature technologies, and this application will not elaborate on their technical solutions or provide any protection for the technical points. AC 220V power supply enters the power input terminal of power module A1. The power output terminal of power module A1 outputs a stable DC 12V power supply to the battery G1 (which can continue to output power to the relevant circuits when the isolation transformer body stops outputting power, so that it can continue to operate) and the power input terminals of the primary winding voltage detection circuit, the secondary winding voltage detection circuit, the alarm circuit, the primary winding resistance detection circuit, and the secondary winding resistance detection circuit.
[0018] Figure 1 , 2As shown, when the isolation transformer body T is working, both power switches S1 should be turned on and both power switches S2 should be turned off. After the primary coil voltage detection circuit is powered on, the AC power input to the primary coil of the isolation transformer body T will be rectified (converted to DC power) by bridge rectifier A3, filtered by capacitor C1, and then enter the other end of adjustable resistor RP1 and RP5. When the voltage input to the primary coil is normal (not too high, for example, not exceeding 230V), the DC power is divided by adjustable resistor RP1 and resistor R1 and enters pin 2 of the three-terminal voltage detector A5. The voltage is lower than the 4.75V threshold voltage inside the three-terminal voltage detector A5. Pin 1 of the three-terminal voltage detector A5 does not output a high level, the thyristor VS will not be triggered to conduct, and the alarm B will not be powered on and sound, indicating that the AC power input voltage to the primary coil is not too high. When the voltage input to the primary coil is too high (e.g., exceeding 230V), the DC power supply, through adjustable resistor RP1 and resistor R1, divides the voltage and enters pin 2 of the three-terminal voltage detector A5, exceeding the internal 4.75V threshold voltage of the detector. Pin 1 of the detector A5 outputs a high level. This high level, through resistor R2, reduces the voltage and limits the current, triggering the thyristor VS to conduct. Alarm B will then be powered on and sound an alarm, indicating that the AC power input to the primary coil is too high. When the voltage input to the primary coil is normal (not too low, e.g., not lower than 200V), the DC power supply, through adjustable resistor RP5 and resistor R13, divides the voltage and enters pin 2 of the three-terminal voltage detector A6, exceeding the internal 4.75V threshold voltage of the detector. Pin 1 of the detector A6 outputs a high level, and the thyristor VS will not be triggered. Therefore, alarm B will not be powered on and sound an alarm, indicating that the AC power input to the primary coil is not too low. When the voltage input to the primary coil is abnormal (too low, for example, below 200V), the DC power supply is divided by adjustable resistor RP5 and resistor R13 and enters pin 2 of the three-terminal voltage detector A6. The voltage is lower than the 4.75V threshold voltage inside the three-terminal voltage detector A6. Pin 1 of the three-terminal voltage detector A6 outputs a low level. The low level is stepped down and current-limited by resistor R3 and enters the base of transistor Q1. Transistor Q1 conducts and the collector outputs a high level. The high level is stepped down and current-limited by resistor R4, triggering the thyristor VS to conduct. Then the alarm B will be powered on and sound, indicating that the AC power supply voltage input to the primary coil is too low.
[0019] Figure 1 , 2As shown, after the secondary coil voltage detection circuit is powered on, the AC power input to the secondary coil of the isolation transformer body T will be rectified (converted to DC power) by bridge rectifier A4, filtered by capacitor C2, and then enter the other end of adjustable resistor RP2. When the voltage input to the secondary coil is normal (not too high, for example, not exceeding 230V), the DC power is divided by adjustable resistor RP2 and resistor R5 and enters pin 2 of three-terminal voltage detector A7. The voltage is lower than the 4.75V threshold voltage inside three-terminal voltage detector A7. Pin 1 of three-terminal voltage detector A7 does not output a high level, the thyristor VS will not be triggered to conduct, and the alarm B will not be powered on and sound, indicating that the AC power input voltage of the secondary coil is not too high. When the voltage input to the secondary coil is too high (e.g., exceeding 230V), the DC power supply is divided by the adjustable resistor RP2 and resistor R5 and enters pin 2 of the three-terminal voltage detector A7, which is higher than the internal 4.75V threshold voltage of the three-terminal voltage detector A7. The pin 1 of the three-terminal voltage detector A7 outputs a high level. The high level is stepped down and current limited by resistor R6 to trigger the conduction of the thyristor VS. Then the alarm B will be powered on and sound, indicating that the AC power supply voltage input to the secondary coil is too high.
[0020] When the voltage input to the secondary coil is normal (not too low, for example, not lower than 200V), the DC power supply is divided by the adjustable resistor RP6 and resistor R14 and enters pin 2 of the three-terminal voltage detector A8. The voltage is higher than the 4.75V threshold voltage inside the three-terminal voltage detector A8. Pin 1 of the three-terminal voltage detector A8 outputs a high level, the thyristor VS will not be triggered to conduct, and the alarm B will not be powered on and sound, indicating that the AC power supply voltage input to the secondary coil is not too low. When the voltage input to the primary coil is abnormal (too low, for example, below 200V), the DC power supply is divided by the adjustable resistor RP6 and resistor R14 and enters pin 2 of the three-terminal voltage detector A8. This voltage is lower than the 4.75V threshold voltage inside the three-terminal voltage detector A8. Pin 1 of the three-terminal voltage detector A8 outputs a low level. The low level is stepped down and current-limited by resistor R7 and enters the base of transistor Q2. Transistor Q2 conducts, and the collector outputs a high level. This high level is stepped down and current-limited by resistor R8, triggering the thyristor VS to conduct. Then, alarm B will be powered on and sound an alarm, indicating that the AC power supply voltage input to the secondary coil is too low.
[0021] Figure 1 , 2As shown, when it is necessary to test the resistance performance of the primary and secondary coils of the isolation transformer body T, both power switches S2 are turned on and both power switches S1 are turned off during operation. After the primary coil resistance detection circuit is powered on, when the resistance value of the primary coil of the isolation transformer body T is normal (not too low), the 12V power supply is divided by the adjustable resistor RP3 and resistor R9, and the voltage is reduced and current limited by resistor R10 to enter the base of transistor Q below 0.7V. Transistor Q will not conduct, the thyristor VS will not be triggered to conduct, and the alarm B will not be powered on, indicating that the resistance value of the primary coil is not too low; when the resistance value of the primary coil of the isolation transformer body T is abnormal (too low), the 12V power supply... The voltage is divided by adjustable resistors RP3 and R9, and then reduced and current-limited by resistor R10. The voltage at the base of transistor Q is higher than 0.7V, so transistor Q will conduct and output a low level to the negative power input terminal of relay J. Relay J is energized and its control power input terminal and normally open contact terminal are closed. The 12V power supply will then be reduced and current-limited through the control power input terminal and normally open contact terminal of relay J, and through resistor R15, triggering the conduction of thyristor VS. Then alarm B will be energized and sound, indicating that the resistance value of the primary coil is too low. After the secondary coil resistance detection circuit is powered on, when the resistance value of the secondary coil of the isolation transformer body T is normal (not too low), the 12V power supply will divide the voltage through adjustable resistors RP4 and R11, and reduce the voltage and current through resistor R12, which will then supply voltage to the base of transistor Q3 below 0.7V. Transistor Q3 will not conduct, the thyristor VS will not be triggered, and therefore the alarm B will not be powered on, indicating that the resistance value of the secondary coil is not too low. When the resistance value of the secondary coil of the isolation transformer body T is abnormal (too low), the 12V power supply... After voltage division by adjustable resistor RP4 and resistor R11, and current limiting by resistor R12, the voltage at the base of transistor Q3 is higher than 0.7V. Transistor Q3 will conduct, and the collector outputs a low level, which enters the negative power input terminal of relay J1. Relay J1 is energized and its control power input terminal and normally open contact terminal are closed. The 12V power supply will be triggered by the relay J1 control power input terminal and normally open contact terminal, and through resistor R13, the voltage will be reduced and the current limited, triggering the conduction of thyristor VS. Then the alarm B will be energized and sound, indicating that the resistance value of the secondary coil is too low.
[0022] Figure 1 , 2As shown above, before use, the relevant circuitry can detect the resistance values of the primary and secondary winding coils. When an abnormality occurs, technicians can hear the alarm and perform repairs in advance. This reduces the risk of damage to the equipment due to voltage anomalies at startup caused by excessively low resistance values in the primary and secondary windings, or excessively high or low secondary output voltage. Furthermore, the system can monitor the input voltage of the primary winding and the output voltage of the secondary winding in real time during operation, and the alarm will alert technicians to any abnormalities, further reducing the likelihood of equipment damage. With this new alarm, technicians can directly understand the specific faults in the isolation transformer by using a multimeter in voltage or resistance mode to specifically test the primary and secondary output voltages or resistance values.
[0023] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model.
[0024] Furthermore, it should be understood that although this specification describes the embodiments, the embodiments do not necessarily contain only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A new type of isolating transformer comprising an isolating transformer body, characterized in that, It also has a primary coil voltage detection circuit, secondary coil voltage detection circuit, alarm circuit, primary coil resistance detection circuit, secondary coil resistance detection circuit; the primary coil voltage detection circuit, secondary coil voltage detection circuit, alarm circuit, primary coil resistance detection circuit, secondary coil resistance detection circuit are installed in the element box; the signal output end of the primary coil voltage detection circuit, secondary coil voltage detection circuit, primary coil resistance detection circuit, secondary coil resistance detection circuit and the signal input end of the alarm circuit are electrically connected; the signal input end of the primary coil voltage detection circuit, primary coil resistance detection circuit, the signal input end of the secondary coil voltage detection circuit, secondary coil resistance detection circuit are electrically connected through the power switch in series and the primary coil and the secondary coil of the isolation transformer body.
2. The novel isolating transformer according to claim 1, characterized in that The primary coil voltage detection circuit and the secondary coil voltage detection circuit are constructed together, and each includes a bridge stack, a capacitor, an adjustable resistor, a resistor, a triode, and a three-terminal voltage detector electrically connected; the positive power output end of the bridge stack is connected with the positive electrode of the capacitor, one end of the first adjustable resistor and the second adjustable resistor, and the emitter of the triode; the other end of the first adjustable resistor and one end of the first resistor are connected with the positive power input end of the first three-terminal voltage detector; the other end of the second adjustable resistor and one end of the second resistor are connected with the positive power input end of the second three-terminal voltage detector; the power output ends of the first three-terminal voltage detector and the second three-terminal voltage detector are connected with one end of the third resistor and one end of the fourth resistor; the other end of the third resistor is connected with one end of the fifth resistor; the other end of the fourth resistor is connected with the base of the triode; the collector of the triode is connected with the other end of the fifth resistor; the negative power output end of the bridge stack is connected with the negative electrode of the capacitor, the other end of the first resistor, and the negative power input end of the first three-terminal voltage detector and the second three-terminal voltage detector.
3. The novel isolating transformer according to claim 1, characterized in that, The primary coil resistance detection circuit and the secondary coil resistance detection circuit have the same structure, and each includes an adjustable resistor, a resistor, a triode, and a relay electrically connected; the positive power input end of the relay is connected with the control power input end; one end of the adjustable resistor is connected with one end of the first resistor and one end of the second resistor; the other end of the first resistor is connected with the emitter of the triode; the other end of the second resistor is connected with the base of the triode; the collector of the triode is connected with the negative power input end of the relay.
4. The novel isolating transformer of claim 1, wherein The alarm circuit includes a thyristor and a resistor electrically connected with an alarm; the positive power input end of the alarm is connected with the cathode of the thyristor; the control electrode of the thyristor is connected with one end of the resistor.